Add kernel parts of revived ipfilter (3.3.3.)

19 files changed, 10805 insertions, 0 deletions

diff --git a/sys/contrib/ipfilter/netinet/fil.c b/sys/contrib/ipfilter/netinet/fil.c
new file mode 100644
index 0000000..bb6eb52
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/fil.c
@@ -0,0 +1,1548 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)fil.c	1.36 6/5/96 (C) 1993-1996 Darren Reed";
+/*static const char rcsid[] = "@(#)$Id: fil.c,v 2.3.2.7 1999/10/21 14:21:40 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
+    defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+#endif
+#if defined(KERNEL) && defined(__FreeBSD_version) && \
+    (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+#else
+# include <sys/ioctl.h>
+#endif
+#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
+# include <sys/systm.h>
+#else
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+#endif
+#include <sys/uio.h>
+#if !defined(__SVR4) && !defined(__svr4__)
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/byteorder.h>
+# if SOLARIS2 < 5
+#  include <sys/dditypes.h>
+# endif
+#  include <sys/stream.h>
+#endif
+#ifndef linux
+# include <sys/protosw.h>
+# include <sys/socket.h>
+#endif
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#ifndef linux
+# include <netinet/ip_var.h>
+#endif
+#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
+# include <sys/hashing.h>
+# include <netinet/in_var.h>
+#endif
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#include "netinet/ip_auth.h"
+# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
+#  include <sys/malloc.h>
+#  if defined(_KERNEL) && !defined(IPFILTER_LKM)
+#   include "opt_ipfilter.h"
+#  endif
+# endif
+#ifndef	MIN
+# define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+#include "netinet/ipl.h"
+
+#ifndef	_KERNEL
+# include "ipf.h"
+# include "ipt.h"
+extern	int	opts;
+
+# define	FR_IFVERBOSE(ex,second,verb_pr)	if (ex) { verbose verb_pr; \
+							  second; }
+# define	FR_IFDEBUG(ex,second,verb_pr)	if (ex) { debug verb_pr; \
+							  second; }
+# define	FR_VERBOSE(verb_pr)			verbose verb_pr
+# define	FR_DEBUG(verb_pr)			debug verb_pr
+# define	SEND_RESET(ip, qif, if, m, fin)		send_reset(ip, if)
+# define	IPLLOG(a, c, d, e)		ipllog()
+# define	FR_NEWAUTH(m, fi, ip, qif)	fr_newauth((mb_t *)m, fi, ip)
+#else /* #ifndef _KERNEL */
+# define	FR_IFVERBOSE(ex,second,verb_pr)	;
+# define	FR_IFDEBUG(ex,second,verb_pr)	;
+# define	FR_VERBOSE(verb_pr)
+# define	FR_DEBUG(verb_pr)
+# define	IPLLOG(a, c, d, e)		ipflog(a, c, d, e)
+# if SOLARIS || defined(__sgi)
+extern	KRWLOCK_T	ipf_mutex, ipf_auth, ipf_nat;
+extern	kmutex_t	ipf_rw;
+# endif
+# if SOLARIS
+#  define	FR_NEWAUTH(m, fi, ip, qif)	fr_newauth((mb_t *)m, fi, \
+							   ip, qif)
+#  define	SEND_RESET(ip, qif, if, fin)	send_reset(fin, ip, qif)
+#  define	ICMP_ERROR(b, ip, t, c, if, dst) \
+			icmp_error(ip, t, c, if, dst)
+# else /* SOLARIS */
+#  define	FR_NEWAUTH(m, fi, ip, qif)	fr_newauth((mb_t *)m, fi, ip)
+#  ifdef linux
+#   define	SEND_RESET(ip, qif, if, fin)	send_reset(ip, ifp)
+#   define	ICMP_ERROR(b, ip, t, c, if, dst) 	icmp_send(b,t,c,0,if)
+#  else
+#   define	SEND_RESET(ip, qif, if, fin)	send_reset(fin, ip)
+#   define	ICMP_ERROR(b, ip, t, c, if, dst) \
+		send_icmp_err(ip, t, c, if, dst)
+#  endif /* linux */
+# endif /* SOLARIS || __sgi */
+#endif /* _KERNEL */
+
+
+struct	filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
+struct	frentry	*ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
+		*ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
+struct	frgroup *ipfgroups[3][2];
+int	fr_flags = IPF_LOGGING, fr_active = 0;
+#if defined(IPFILTER_DEFAULT_BLOCK)
+int	fr_pass = FR_NOMATCH|FR_BLOCK;
+#else
+int	fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
+#endif
+char	ipfilter_version[] = IPL_VERSION;
+
+fr_info_t	frcache[2];
+
+static	int	fr_tcpudpchk __P((frentry_t *, fr_info_t *));
+static	int	frflushlist __P((int, minor_t, int *, frentry_t **));
+
+
+/*
+ * bit values for identifying presence of individual IP options
+ */
+struct	optlist	ipopts[20] = {
+	{ IPOPT_NOP,	0x000001 },
+	{ IPOPT_RR,	0x000002 },
+	{ IPOPT_ZSU,	0x000004 },
+	{ IPOPT_MTUP,	0x000008 },
+	{ IPOPT_MTUR,	0x000010 },
+	{ IPOPT_ENCODE,	0x000020 },
+	{ IPOPT_TS,	0x000040 },
+	{ IPOPT_TR,	0x000080 },
+	{ IPOPT_SECURITY, 0x000100 },
+	{ IPOPT_LSRR,	0x000200 },
+	{ IPOPT_E_SEC,	0x000400 },
+	{ IPOPT_CIPSO,	0x000800 },
+	{ IPOPT_SATID,	0x001000 },
+	{ IPOPT_SSRR,	0x002000 },
+	{ IPOPT_ADDEXT,	0x004000 },
+	{ IPOPT_VISA,	0x008000 },
+	{ IPOPT_IMITD,	0x010000 },
+	{ IPOPT_EIP,	0x020000 },
+	{ IPOPT_FINN,	0x040000 },
+	{ 0,		0x000000 }
+};
+
+/*
+ * bit values for identifying presence of individual IP security options
+ */
+struct	optlist	secopt[8] = {
+	{ IPSO_CLASS_RES4,	0x01 },
+	{ IPSO_CLASS_TOPS,	0x02 },
+	{ IPSO_CLASS_SECR,	0x04 },
+	{ IPSO_CLASS_RES3,	0x08 },
+	{ IPSO_CLASS_CONF,	0x10 },
+	{ IPSO_CLASS_UNCL,	0x20 },
+	{ IPSO_CLASS_RES2,	0x40 },
+	{ IPSO_CLASS_RES1,	0x80 }
+};
+
+
+/*
+ * compact the IP header into a structure which contains just the info.
+ * which is useful for comparing IP headers with.
+ */
+void	fr_makefrip(hlen, ip, fin)
+int hlen;
+ip_t *ip;
+fr_info_t *fin;
+{
+	struct optlist *op;
+	tcphdr_t *tcp;
+	fr_ip_t *fi = &fin->fin_fi;
+	u_short optmsk = 0, secmsk = 0, auth = 0;
+	int i, mv, ol, off;
+	u_char *s, opt;
+
+	fin->fin_rev = 0;
+	fin->fin_fr = NULL;
+	fin->fin_tcpf = 0;
+	fin->fin_data[0] = 0;
+	fin->fin_data[1] = 0;
+	fin->fin_rule = -1;
+	fin->fin_group = -1;
+	fin->fin_id = ip->ip_id;
+#ifdef	_KERNEL
+	fin->fin_icode = ipl_unreach;
+#endif
+	fi->fi_v = ip->ip_v;
+	fi->fi_tos = ip->ip_tos;
+	fin->fin_hlen = hlen;
+	fin->fin_dlen = ip->ip_len - hlen;
+	tcp = (tcphdr_t *)((char *)ip + hlen);
+	fin->fin_dp = (void *)tcp;
+	(*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
+	fi->fi_src.s_addr = ip->ip_src.s_addr;
+	fi->fi_dst.s_addr = ip->ip_dst.s_addr;
+
+	fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
+	off = (ip->ip_off & IP_OFFMASK) << 3;
+	if (ip->ip_off & 0x3fff)
+		fi->fi_fl |= FI_FRAG;
+	switch (ip->ip_p)
+	{
+	case IPPROTO_ICMP :
+	{
+		int minicmpsz = sizeof(struct icmp);
+		icmphdr_t *icmp;
+
+		icmp = (icmphdr_t *)tcp;
+
+		if (!off && (icmp->icmp_type == ICMP_ECHOREPLY ||
+		     icmp->icmp_type == ICMP_ECHO))
+			minicmpsz = ICMP_MINLEN;
+		if ((!(ip->ip_len >= hlen + minicmpsz) && !off) ||
+		    (off && off < sizeof(struct icmp)))
+			fi->fi_fl |= FI_SHORT;
+		if (fin->fin_dlen > 1)
+			fin->fin_data[0] = *(u_short *)tcp;
+		break;
+	}
+	case IPPROTO_TCP :
+		fi->fi_fl |= FI_TCPUDP;
+		if ((!IPMINLEN(ip, tcphdr) && !off) ||
+		    (off && off < sizeof(struct tcphdr)))
+			fi->fi_fl |= FI_SHORT;
+		if (!(fi->fi_fl & FI_SHORT) && !off)
+			fin->fin_tcpf = tcp->th_flags;
+		goto getports;
+	case IPPROTO_UDP :
+		fi->fi_fl |= FI_TCPUDP;
+		if ((!IPMINLEN(ip, udphdr) && !off) ||
+		    (off && off < sizeof(struct udphdr)))
+			fi->fi_fl |= FI_SHORT;
+getports:
+		if (!off && (fin->fin_dlen > 3)) {
+			fin->fin_data[0] = ntohs(tcp->th_sport);
+			fin->fin_data[1] = ntohs(tcp->th_dport);
+		}
+		break;
+	default :
+		break;
+	}
+
+
+	for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen; ) {
+		opt = *s;
+		if (opt == '\0')
+			break;
+		ol = (opt == IPOPT_NOP) ? 1 : (int)*(s+1);
+		if (opt > 1 && (ol < 2 || ol > hlen))
+			break;
+		for (i = 9, mv = 4; mv >= 0; ) {
+			op = ipopts + i;
+			if (opt == (u_char)op->ol_val) {
+				optmsk |= op->ol_bit;
+				if (opt == IPOPT_SECURITY) {
+					struct optlist *sp;
+					u_char	sec;
+					int j, m;
+
+					sec = *(s + 2);	/* classification */
+					for (j = 3, m = 2; m >= 0; ) {
+						sp = secopt + j;
+						if (sec == sp->ol_val) {
+							secmsk |= sp->ol_bit;
+							auth = *(s + 3);
+							auth *= 256;
+							auth += *(s + 4);
+							break;
+						}
+						if (sec < sp->ol_val)
+							j -= m--;
+						else
+							j += m--;
+					}
+				}
+				break;
+			}
+			if (opt < op->ol_val)
+				i -= mv--;
+			else
+				i += mv--;
+		}
+		hlen -= ol;
+		s += ol;
+	}
+	if (auth && !(auth & 0x0100))
+		auth &= 0xff00;
+	fi->fi_optmsk = optmsk;
+	fi->fi_secmsk = secmsk;
+	fi->fi_auth = auth;
+}
+
+
+/*
+ * check an IP packet for TCP/UDP characteristics such as ports and flags.
+ */
+static int fr_tcpudpchk(fr, fin)
+frentry_t *fr;
+fr_info_t *fin;
+{
+	register u_short po, tup;
+	register char i;
+	register int err = 1;
+
+	/*
+	 * Both ports should *always* be in the first fragment.
+	 * So far, I cannot find any cases where they can not be.
+	 *
+	 * compare destination ports
+	 */
+	if ((i = (int)fr->fr_dcmp)) {
+		po = fr->fr_dport;
+		tup = fin->fin_data[1];
+		/*
+		 * Do opposite test to that required and
+		 * continue if that succeeds.
+		 */
+		if (!--i && tup != po) /* EQUAL */
+			err = 0;
+		else if (!--i && tup == po) /* NOTEQUAL */
+			err = 0;
+		else if (!--i && tup >= po) /* LESSTHAN */
+			err = 0;
+		else if (!--i && tup <= po) /* GREATERTHAN */
+			err = 0;
+		else if (!--i && tup > po) /* LT or EQ */
+			err = 0;
+		else if (!--i && tup < po) /* GT or EQ */
+			err = 0;
+		else if (!--i &&	   /* Out of range */
+			 (tup >= po && tup <= fr->fr_dtop))
+			err = 0;
+		else if (!--i &&	   /* In range */
+			 (tup <= po || tup >= fr->fr_dtop))
+			err = 0;
+	}
+	/*
+	 * compare source ports
+	 */
+	if (err && (i = (int)fr->fr_scmp)) {
+		po = fr->fr_sport;
+		tup = fin->fin_data[0];
+		if (!--i && tup != po)
+			err = 0;
+		else if (!--i && tup == po)
+			err = 0;
+		else if (!--i && tup >= po)
+			err = 0;
+		else if (!--i && tup <= po)
+			err = 0;
+		else if (!--i && tup > po)
+			err = 0;
+		else if (!--i && tup < po)
+			err = 0;
+		else if (!--i &&	   /* Out of range */
+			 (tup >= po && tup <= fr->fr_stop))
+			err = 0;
+		else if (!--i &&	   /* In range */
+			 (tup <= po || tup >= fr->fr_stop))
+			err = 0;
+	}
+
+	/*
+	 * If we don't have all the TCP/UDP header, then how can we
+	 * expect to do any sort of match on it ?  If we were looking for
+	 * TCP flags, then NO match.  If not, then match (which should
+	 * satisfy the "short" class too).
+	 */
+	if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
+		if (fin->fin_fi.fi_fl & FI_SHORT)
+			return !(fr->fr_tcpf | fr->fr_tcpfm);
+		/*
+		 * Match the flags ?  If not, abort this match.
+		 */
+		if (fr->fr_tcpfm &&
+		    fr->fr_tcpf != (fin->fin_tcpf & fr->fr_tcpfm)) {
+			FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
+				 fr->fr_tcpfm, fr->fr_tcpf));
+			err = 0;
+		}
+	}
+	return err;
+}
+
+/*
+ * Check the input/output list of rules for a match and result.
+ * Could be per interface, but this gets real nasty when you don't have
+ * kernel sauce.
+ */
+int fr_scanlist(pass, ip, fin, m)
+u_32_t pass;
+ip_t *ip;
+register fr_info_t *fin;
+void *m;
+{
+	register struct frentry *fr;
+	register fr_ip_t *fi = &fin->fin_fi;
+	int rulen, portcmp = 0, off, skip = 0, logged = 0;
+	u_32_t passt;
+
+	fr = fin->fin_fr;
+	fin->fin_fr = NULL;
+	fin->fin_rule = 0;
+	fin->fin_group = 0;
+	off = ip->ip_off & IP_OFFMASK;
+	pass |= (fi->fi_fl << 24);
+
+	if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
+		portcmp = 1;
+
+	for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
+		if (skip) {
+			skip--;
+			continue;
+		}
+		/*
+		 * In all checks below, a null (zero) value in the
+		 * filter struture is taken to mean a wildcard.
+		 *
+		 * check that we are working for the right interface
+		 */
+#ifdef	_KERNEL
+# if BSD >= 199306
+		if (fin->fin_out != 0) {
+			if ((fr->fr_oifa &&
+			     fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif) ||
+			    (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp))
+				continue;
+		} else
+# endif
+			if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
+				continue;
+#else
+		if (opts & (OPT_VERBOSE|OPT_DEBUG))
+			printf("\n");
+		FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' : 
+				  (pass & FR_AUTH) ? 'a' : 'b'));
+		if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
+			continue;
+		FR_VERBOSE((":i"));
+#endif
+		{
+			register u_32_t	*ld, *lm, *lip;
+			register int i;
+
+			lip = (u_32_t *)fi;
+			lm = (u_32_t *)&fr->fr_mip;
+			ld = (u_32_t *)&fr->fr_ip;
+			i = ((lip[0] & lm[0]) != ld[0]);
+			FR_IFDEBUG(i,continue,("0. %#08x & %#08x != %#08x\n",
+				   lip[0], lm[0], ld[0]));
+			i |= ((lip[1] & lm[1]) != ld[1]) << 19;
+			i ^= (fr->fr_flags & FR_NOTSRCIP);
+			FR_IFDEBUG(i,continue,("1. %#08x & %#08x != %#08x\n",
+				   lip[1], lm[1], ld[1]));
+			i |= ((lip[2] & lm[2]) != ld[2]) << 20;
+			i ^= (fr->fr_flags & FR_NOTDSTIP);
+			FR_IFDEBUG(i,continue,("2. %#08x & %#08x != %#08x\n",
+				   lip[2], lm[2], ld[2]));
+			i |= ((lip[3] & lm[3]) != ld[3]);
+			FR_IFDEBUG(i,continue,("3. %#08x & %#08x != %#08x\n",
+				   lip[3], lm[3], ld[3]));
+			i |= ((lip[4] & lm[4]) != ld[4]);
+			FR_IFDEBUG(i,continue,("4. %#08x & %#08x != %#08x\n",
+				   lip[4], lm[4], ld[4]));
+			if (i)
+				continue;
+		}
+
+		/*
+		 * If a fragment, then only the first has what we're looking
+		 * for here...
+		 */
+		if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
+				 fr->fr_tcpfm))
+			continue;
+		if (fi->fi_fl & FI_TCPUDP) {
+			if (!fr_tcpudpchk(fr, fin))
+				continue;
+		} else if (fr->fr_icmpm || fr->fr_icmp) {
+			if ((fi->fi_p != IPPROTO_ICMP) || off ||
+			    (fin->fin_dlen < 2))
+				continue;
+			if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
+				FR_DEBUG(("i. %#x & %#x != %#x\n",
+					 fin->fin_data[0], fr->fr_icmpm,
+					 fr->fr_icmp));
+				continue;
+			}
+		}
+		FR_VERBOSE(("*"));
+		/*
+		 * Just log this packet...
+		 */
+		passt = fr->fr_flags;
+		if ((passt & FR_CALLNOW) && fr->fr_func)
+			passt = (*fr->fr_func)(passt, ip, fin);
+		fin->fin_fr = fr;
+#ifdef  IPFILTER_LOG
+		if ((passt & FR_LOGMASK) == FR_LOG) {
+			if (!IPLLOG(passt, ip, fin, m)) {
+				ATOMIC_INC(frstats[fin->fin_out].fr_skip);
+			}
+			ATOMIC_INC(frstats[fin->fin_out].fr_pkl);
+			logged = 1;
+		}
+#endif /* IPFILTER_LOG */
+		if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
+			pass = passt;
+		FR_DEBUG(("pass %#x\n", pass));
+		ATOMIC_INC(fr->fr_hits);
+		if (pass & FR_ACCOUNT)
+			fr->fr_bytes += (U_QUAD_T)ip->ip_len;
+		else
+			fin->fin_icode = fr->fr_icode;
+		fin->fin_rule = rulen;
+		fin->fin_group = fr->fr_group;
+		if (fr->fr_grp) {
+			fin->fin_fr = fr->fr_grp;
+			pass = fr_scanlist(pass, ip, fin, m);
+			if (fin->fin_fr == NULL) {
+				fin->fin_rule = rulen;
+				fin->fin_group = fr->fr_group;
+				fin->fin_fr = fr;
+			}
+			if (pass & FR_DONTCACHE)
+				logged = 1;
+		}
+		if (pass & FR_QUICK)
+			break;
+	}
+	if (logged)
+		pass |= FR_DONTCACHE;
+	return pass;
+}
+
+
+/*
+ * frcheck - filter check
+ * check using source and destination addresses/ports in a packet whether
+ * or not to pass it on or not.
+ */
+int fr_check(ip, hlen, ifp, out
+#if defined(_KERNEL) && SOLARIS
+, qif, mp)
+qif_t *qif;
+#else
+, mp)
+#endif
+mb_t **mp;
+ip_t *ip;
+int hlen;
+void *ifp;
+int out;
+{
+	/*
+	 * The above really sucks, but short of writing a diff
+	 */
+	fr_info_t frinfo, *fc;
+	register fr_info_t *fin = &frinfo;
+	frentry_t *fr = NULL;
+	int changed, error = EHOSTUNREACH;
+	u_32_t pass, apass;
+#if !SOLARIS || !defined(_KERNEL)
+	register mb_t *m = *mp;
+#endif
+
+#ifdef	_KERNEL
+	mb_t *mc = NULL;
+# if !defined(__SVR4) && !defined(__svr4__)
+#  ifdef __sgi
+	char hbuf[(0xf << 2) + sizeof(struct icmp) + sizeof(ip_t) + 8];
+#  endif
+	int up;
+
+#  ifdef M_CANFASTFWD
+	/*
+	 * XXX For now, IP Filter and fast-forwarding of cached flows
+	 * XXX are mutually exclusive.  Eventually, IP Filter should
+	 * XXX get a "can-fast-forward" filter rule.
+	 */
+	m->m_flags &= ~M_CANFASTFWD;
+#  endif /* M_CANFASTFWD */
+
+	if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ||
+	     ip->ip_p == IPPROTO_ICMP)) {
+		int plen = 0;
+
+		if ((ip->ip_off & IP_OFFMASK) == 0)
+			switch(ip->ip_p)
+			{
+			case IPPROTO_TCP:
+				plen = sizeof(tcphdr_t);
+				break;
+			case IPPROTO_UDP:
+				plen = sizeof(udphdr_t);
+				break;
+			/* 96 - enough for complete ICMP error IP header */
+			case IPPROTO_ICMP:
+				plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
+				break;
+			}
+		up = MIN(hlen + plen, ip->ip_len);
+
+		if (up > m->m_len) {
+#  ifdef __sgi
+	/* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
+			if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
+				ATOMIC_INC(frstats[out].fr_pull[1]);
+				return -1;
+			}
+			m_copydata(m, 0, up, hbuf);
+			ATOMIC_INC(frstats[out].fr_pull[0]);
+			ip = (ip_t *)hbuf;
+#  else /* __ sgi */
+#   ifndef linux
+			if ((*mp = m_pullup(m, up)) == 0) {
+				ATOMIC_INC(frstats[out].fr_pull[1]);
+				return -1;
+			} else {
+				ATOMIC_INC(frstats[out].fr_pull[0]);
+				m = *mp;
+				ip = mtod(m, ip_t *);
+			}
+#   endif /* !linux */
+#  endif /* __sgi */
+		} else
+			up = 0;
+	} else
+		up = 0;
+# endif /* !defined(__SVR4) && !defined(__svr4__) */
+# if SOLARIS
+	mb_t *m = qif->qf_m;
+
+	if ((u_int)ip & 0x3)
+		return 2;
+	fin->fin_qfm = m;
+	fin->fin_qif = qif;
+# endif
+#endif /* _KERNEL */
+	fr_makefrip(hlen, ip, fin);
+	fin->fin_ifp = ifp;
+	fin->fin_out = out;
+	fin->fin_mp = mp;
+	pass = fr_pass;
+
+	READ_ENTER(&ipf_mutex);
+
+	/*
+	 * Check auth now.  This, combined with the check below to see if apass
+	 * is 0 is to ensure that we don't count the packet twice, which can
+	 * otherwise occur when we reprocess it.  As it is, we only count it
+	 * after it has no auth. table matchup.  This also stops NAT from
+	 * occuring until after the packet has been auth'd.
+	 */
+	apass = fr_checkauth(ip, fin);
+
+	if (!out) {
+		changed = ip_natin(ip, fin);
+		if (!apass && (fin->fin_fr = ipacct[0][fr_active]) &&
+		    (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
+			ATOMIC_INC(frstats[0].fr_acct);
+		}
+	}
+
+	if (apass || (!(fr = ipfr_knownfrag(ip, fin)) &&
+	    !(fr = fr_checkstate(ip, fin)))) {
+		/*
+		 * If a packet is found in the auth table, then skip checking
+		 * the access lists for permission but we do need to consider
+		 * the result as if it were from the ACL's.
+		 */
+		if (!apass) {
+			fc = frcache + out;
+			if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
+				/*
+				 * copy cached data so we can unlock the mutex
+				 * earlier.
+				 */
+				bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
+				ATOMIC_INC(frstats[out].fr_chit);
+				if ((fr = fin->fin_fr)) {
+					ATOMIC_INC(fr->fr_hits);
+					pass = fr->fr_flags;
+				}
+			} else {
+				if ((fin->fin_fr = ipfilter[out][fr_active]))
+					pass = fr_scanlist(fr_pass, ip, fin, m);
+				if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
+					bcopy((char *)fin, (char *)fc,
+					      FI_COPYSIZE);
+				if (pass & FR_NOMATCH) {
+					ATOMIC_INC(frstats[out].fr_nom);
+				}
+			}
+			fr = fin->fin_fr;
+		} else
+			pass = apass;
+
+		/*
+		 * If we fail to add a packet to the authorization queue,
+		 * then we drop the packet later.  However, if it was added
+		 * then pretend we've dropped it already.
+		 */
+		if ((pass & FR_AUTH))
+			if (FR_NEWAUTH(m, fin, ip, qif) != 0)
+#ifdef	_KERNEL
+				m = *mp = NULL;
+#else
+				;
+#endif
+
+		if (pass & FR_PREAUTH) {
+			READ_ENTER(&ipf_auth);
+			if ((fin->fin_fr = ipauth) &&
+			    (pass = fr_scanlist(0, ip, fin, m))) {
+				ATOMIC_INC(fr_authstats.fas_hits);
+			} else {
+				ATOMIC_INC(fr_authstats.fas_miss);
+			}
+			RWLOCK_EXIT(&ipf_auth);
+		}
+
+		fin->fin_fr = fr;
+		if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
+			if (fin->fin_fi.fi_fl & FI_FRAG) {
+				if (ipfr_newfrag(ip, fin, pass) == -1) {
+					ATOMIC_INC(frstats[out].fr_bnfr);
+				} else {
+					ATOMIC_INC(frstats[out].fr_nfr);
+				}
+			} else {
+				ATOMIC_INC(frstats[out].fr_cfr);
+			}
+		}
+		if (pass & FR_KEEPSTATE) {
+			if (fr_addstate(ip, fin, 0) == NULL) {
+				ATOMIC_INC(frstats[out].fr_bads);
+			} else {
+				ATOMIC_INC(frstats[out].fr_ads);
+			}
+		}
+	} else if (fr != NULL) {
+		pass = fr->fr_flags;
+		if (pass & FR_LOGFIRST)
+			pass &= ~(FR_LOGFIRST|FR_LOG);
+	}
+
+	if (fr && fr->fr_func && !(pass & FR_CALLNOW))
+		pass = (*fr->fr_func)(pass, ip, fin);
+
+	/*
+	 * Only count/translate packets which will be passed on, out the
+	 * interface.
+	 */
+	if (out && (pass & FR_PASS)) {
+		if ((fin->fin_fr = ipacct[1][fr_active]) &&
+		    (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
+			ATOMIC_INC(frstats[1].fr_acct);
+		}
+		fin->fin_fr = fr;
+		changed = ip_natout(ip, fin);
+	} else
+		fin->fin_fr = fr;
+	RWLOCK_EXIT(&ipf_mutex);
+
+#ifdef	IPFILTER_LOG
+	if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
+		if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
+			pass |= FF_LOGNOMATCH;
+			ATOMIC_INC(frstats[out].fr_npkl);
+			goto logit;
+		} else if (((pass & FR_LOGMASK) == FR_LOGP) ||
+		    ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
+			if ((pass & FR_LOGMASK) != FR_LOGP)
+				pass |= FF_LOGPASS;
+			ATOMIC_INC(frstats[out].fr_ppkl);
+			goto logit;
+		} else if (((pass & FR_LOGMASK) == FR_LOGB) ||
+			   ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
+			if ((pass & FR_LOGMASK) != FR_LOGB)
+				pass |= FF_LOGBLOCK;
+			ATOMIC_INC(frstats[out].fr_bpkl);
+logit:
+			if (!IPLLOG(pass, ip, fin, m)) {
+				ATOMIC_INC(frstats[out].fr_skip);
+				if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
+				    (FR_PASS|FR_LOGORBLOCK))
+					pass ^= FR_PASS|FR_BLOCK;
+			}
+		}
+	}
+#endif /* IPFILTER_LOG */
+#ifdef	_KERNEL
+	/*
+	 * Only allow FR_DUP to work if a rule matched - it makes no sense to
+	 * set FR_DUP as a "default" as there are no instructions about where
+	 * to send the packet.
+	 */
+	if (fr && (pass & FR_DUP))
+# if	SOLARIS
+		mc = dupmsg(m);
+# else
+#  ifndef linux
+		mc = m_copy(m, 0, M_COPYALL);
+#  else
+		;
+#  endif
+# endif
+#endif
+	if (pass & FR_PASS) {
+		ATOMIC_INC(frstats[out].fr_pass);
+	} else if (pass & FR_BLOCK) {
+		ATOMIC_INC(frstats[out].fr_block);
+		/*
+		 * Should we return an ICMP packet to indicate error
+		 * status passing through the packet filter ?
+		 * WARNING: ICMP error packets AND TCP RST packets should
+		 * ONLY be sent in repsonse to incoming packets.  Sending them
+		 * in response to outbound packets can result in a panic on
+		 * some operating systems.
+		 */
+		if (!out) {
+#ifdef	_KERNEL
+			if (pass & FR_RETICMP) {
+				struct in_addr dst;
+
+				if ((pass & FR_RETMASK) == FR_FAKEICMP)
+					dst = ip->ip_dst;
+				else
+					dst.s_addr = 0;
+# if SOLARIS
+				ICMP_ERROR(q, ip, ICMP_UNREACH, fin->fin_icode,
+					   qif, dst);
+# else
+				ICMP_ERROR(m, ip, ICMP_UNREACH, fin->fin_icode,
+					   ifp, dst);
+# endif
+				ATOMIC_INC(frstats[0].fr_ret);
+			} else if (((pass & FR_RETMASK) == FR_RETRST) &&
+				   !(fin->fin_fi.fi_fl & FI_SHORT)) {
+				if (SEND_RESET(ip, qif, ifp, fin) == 0) {
+					ATOMIC_INC(frstats[1].fr_ret);
+				}
+			}
+#else
+			if ((pass & FR_RETMASK) == FR_RETICMP) {
+				verbose("- ICMP unreachable sent\n");
+				ATOMIC_INC(frstats[0].fr_ret);
+			} else if ((pass & FR_RETMASK) == FR_FAKEICMP) {
+				verbose("- forged ICMP unreachable sent\n");
+				ATOMIC_INC(frstats[0].fr_ret);
+			} else if (((pass & FR_RETMASK) == FR_RETRST) &&
+				   !(fin->fin_fi.fi_fl & FI_SHORT)) {
+				verbose("- TCP RST sent\n");
+				ATOMIC_INC(frstats[1].fr_ret);
+			}
+#endif
+		} else {
+			if (pass & FR_RETRST)
+				error = ECONNRESET;
+		}
+	}
+
+	/*
+	 * If we didn't drop off the bottom of the list of rules (and thus
+	 * the 'current' rule fr is not NULL), then we may have some extra
+	 * instructions about what to do with a packet.
+	 * Once we're finished return to our caller, freeing the packet if
+	 * we are dropping it (* BSD ONLY *).
+	 */
+#if defined(_KERNEL)
+# if !SOLARIS
+#  if !defined(linux)
+	if (fr) {
+		frdest_t *fdp = &fr->fr_tif;
+
+		if (((pass & FR_FASTROUTE) && !out) ||
+		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+			if (ipfr_fastroute(m, fin, fdp) == 0)
+				m = *mp = NULL;
+		}
+		if (mc)
+			ipfr_fastroute(mc, fin, &fr->fr_dif);
+	}
+	if (!(pass & FR_PASS) && m)
+		m_freem(m);
+#   ifdef __sgi
+	else if (changed && up && m)
+		m_copyback(m, 0, up, hbuf);
+#   endif
+#  endif /* !linux */
+# else /* !SOLARIS */
+	if (fr) {
+		frdest_t *fdp = &fr->fr_tif;
+
+		if (((pass & FR_FASTROUTE) && !out) ||
+		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+			if (ipfr_fastroute(qif, ip, m, mp, fin, fdp) == 0)
+				m = *mp = NULL;
+		}
+		if (mc)
+			ipfr_fastroute(qif, ip, mc, mp, fin, &fr->fr_dif);
+	}
+# endif /* !SOLARIS */
+	return (pass & FR_PASS) ? 0 : error;
+#else /* _KERNEL */
+	if (pass & FR_NOMATCH)
+		return 1;
+	if (pass & FR_PASS)
+		return 0;
+	if (pass & FR_AUTH)
+		return -2;
+	return -1;
+#endif /* _KERNEL */
+}
+
+
+/*
+ * ipf_cksum
+ * addr should be 16bit aligned and len is in bytes.
+ * length is in bytes
+ */
+u_short ipf_cksum(addr, len)
+register u_short *addr;
+register int len;
+{
+	register u_32_t sum = 0;
+
+	for (sum = 0; len > 1; len -= 2)
+		sum += *addr++;
+
+	/* mop up an odd byte, if necessary */
+	if (len == 1)
+		sum += *(u_char *)addr;
+
+	/*
+	 * add back carry outs from top 16 bits to low 16 bits
+	 */
+	sum = (sum >> 16) + (sum & 0xffff);	/* add hi 16 to low 16 */
+	sum += (sum >> 16);			/* add carry */
+	return (u_short)(~sum);
+}
+
+
+/*
+ * NB: This function assumes we've pullup'd enough for all of the IP header
+ * and the TCP header.  We also assume that data blocks aren't allocated in
+ * odd sizes.
+ */
+u_short fr_tcpsum(m, ip, tcp)
+mb_t *m;
+ip_t *ip;
+tcphdr_t *tcp;
+{
+	u_short *sp, slen, ts;
+	u_int sum, sum2;
+	int hlen;
+
+	/*
+	 * Add up IP Header portion
+	 */
+	hlen = ip->ip_hl << 2;
+	slen = ip->ip_len - hlen;
+	sum = htons((u_short)ip->ip_p);
+	sum += htons(slen);
+	sp = (u_short *)&ip->ip_src;
+	sum += *sp++;	/* ip_src */
+	sum += *sp++;
+	sum += *sp++;	/* ip_dst */
+	sum += *sp++;
+	ts = tcp->th_sum;
+	tcp->th_sum = 0;
+#ifdef	KERNEL
+# if SOLARIS
+	sum2 = ip_cksum(m, hlen, sum);	/* hlen == offset */
+	sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+	sum2 = ~sum2 & 0xffff;
+# else /* SOLARIS */
+#  if defined(BSD) || defined(sun)
+#   if BSD >= 199306
+	m->m_data += hlen;
+#   else
+	m->m_off += hlen;
+#   endif
+	m->m_len -= hlen;
+	sum2 = in_cksum(m, slen);
+	m->m_len += hlen;
+#   if BSD >= 199306
+	m->m_data -= hlen;
+#   else
+	m->m_off -= hlen;
+#   endif
+	/*
+	 * Both sum and sum2 are partial sums, so combine them together.
+	 */
+	sum = (sum & 0xffff) + (sum >> 16);
+	sum = ~sum & 0xffff;
+	sum2 += sum;
+	sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+#  else /* defined(BSD) || defined(sun) */
+{
+	union {
+		u_char	c[2];
+		u_short	s;
+	} bytes;
+	u_short len = ip->ip_len;
+# if defined(__sgi)
+	int add;
+# endif
+
+	/*
+	 * Add up IP Header portion
+	 */
+	sp = (u_short *)&ip->ip_src;
+	len -= (ip->ip_hl << 2);
+	sum = ntohs(IPPROTO_TCP);
+	sum += htons(len);
+	sum += *sp++;	/* ip_src */
+	sum += *sp++;
+	sum += *sp++;	/* ip_dst */
+	sum += *sp++;
+	if (sp != (u_short *)tcp)
+		sp = (u_short *)tcp;
+	sum += *sp++;	/* sport */
+	sum += *sp++;	/* dport */
+	sum += *sp++;	/* seq */
+	sum += *sp++;
+	sum += *sp++;	/* ack */
+	sum += *sp++;
+	sum += *sp++;	/* off */
+	sum += *sp++;	/* win */
+	sum += *sp++;	/* Skip over checksum */
+	sum += *sp++;	/* urp */
+
+# ifdef	__sgi
+	/*
+	 * In case we had to copy the IP & TCP header out of mbufs,
+	 * skip over the mbuf bits which are the header
+	 */
+	if ((caddr_t)ip != mtod(m, caddr_t)) {
+		hlen = (caddr_t)sp - (caddr_t)ip;
+		while (hlen) {
+			add = MIN(hlen, m->m_len);
+			sp = (u_short *)(mtod(m, caddr_t) + add);
+			hlen -= add;
+			if (add == m->m_len) {
+				m = m->m_next;
+				if (!hlen) {
+					if (!m)
+						break;
+					sp = mtod(m, u_short *);
+				}
+				PANIC((!m),("fr_tcpsum(1): not enough data"));
+			}
+		}
+	}
+# endif
+
+	if (!(len -= sizeof(*tcp)))
+		goto nodata;
+	while (len > 1) {
+		if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
+			m = m->m_next;
+			PANIC((!m),("fr_tcpsum(2): not enough data"));
+			sp = mtod(m, u_short *);
+		}
+		if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
+			bytes.c[0] = *(u_char *)sp;
+			m = m->m_next;
+			PANIC((!m),("fr_tcpsum(3): not enough data"));
+			sp = mtod(m, u_short *);
+			bytes.c[1] = *(u_char *)sp;
+			sum += bytes.s;
+			sp = (u_short *)((u_char *)sp + 1);
+		}
+		if ((u_long)sp & 1) {
+			bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
+			sum += bytes.s;
+		} else
+			sum += *sp++;
+		len -= 2;
+	}
+	if (len)
+		sum += ntohs(*(u_char *)sp << 8);
+nodata:
+	while (sum > 0xffff)
+		sum = (sum & 0xffff) + (sum >> 16);
+	sum2 = (u_short)(~sum & 0xffff);
+}
+#  endif /*  defined(BSD) || defined(sun) */
+# endif /* SOLARIS */
+#else /* KERNEL */
+	sum2 = 0;
+#endif /* KERNEL */
+	tcp->th_sum = ts;
+	return sum2;
+}
+
+
+#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
+/*
+ * Copyright (c) 1982, 1986, 1988, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)uipc_mbuf.c	8.2 (Berkeley) 1/4/94
+ * $Id: fil.c,v 2.3.2.7 1999/10/21 14:21:40 darrenr Exp $
+ */
+/*
+ * Copy data from an mbuf chain starting "off" bytes from the beginning,
+ * continuing for "len" bytes, into the indicated buffer.
+ */
+void
+m_copydata(m, off, len, cp)
+	register mb_t *m;
+	register int off;
+	register int len;
+	caddr_t cp;
+{
+	register unsigned count;
+
+	if (off < 0 || len < 0)
+		panic("m_copydata");
+	while (off > 0) {
+		if (m == 0)
+			panic("m_copydata");
+		if (off < m->m_len)
+			break;
+		off -= m->m_len;
+		m = m->m_next;
+	}
+	while (len > 0) {
+		if (m == 0)
+			panic("m_copydata");
+		count = MIN(m->m_len - off, len);
+		bcopy(mtod(m, caddr_t) + off, cp, count);
+		len -= count;
+		cp += count;
+		off = 0;
+		m = m->m_next;
+	}
+}
+
+
+# ifndef linux
+/*
+ * Copy data from a buffer back into the indicated mbuf chain,
+ * starting "off" bytes from the beginning, extending the mbuf
+ * chain if necessary.
+ */
+void
+m_copyback(m0, off, len, cp)
+	struct	mbuf *m0;
+	register int off;
+	register int len;
+	caddr_t cp;
+{
+	register int mlen;
+	register struct mbuf *m = m0, *n;
+	int totlen = 0;
+
+	if (m0 == 0)
+		return;
+	while (off > (mlen = m->m_len)) {
+		off -= mlen;
+		totlen += mlen;
+		if (m->m_next == 0) {
+			n = m_getclr(M_DONTWAIT, m->m_type);
+			if (n == 0)
+				goto out;
+			n->m_len = min(MLEN, len + off);
+			m->m_next = n;
+		}
+		m = m->m_next;
+	}
+	while (len > 0) {
+		mlen = min (m->m_len - off, len);
+		bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
+		cp += mlen;
+		len -= mlen;
+		mlen += off;
+		off = 0;
+		totlen += mlen;
+		if (len == 0)
+			break;
+		if (m->m_next == 0) {
+			n = m_get(M_DONTWAIT, m->m_type);
+			if (n == 0)
+				break;
+			n->m_len = min(MLEN, len);
+			m->m_next = n;
+		}
+		m = m->m_next;
+	}
+out:
+#if 0
+	if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
+		m->m_pkthdr.len = totlen;
+#endif
+	return;
+}
+# endif /* linux */
+#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
+
+
+frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
+u_int num;
+u_32_t flags;
+minor_t which;
+int set;
+frgroup_t ***fgpp;
+{
+	frgroup_t *fg, **fgp;
+
+	if (which == IPL_LOGAUTH)
+		fgp = &ipfgroups[2][set];
+	else if (flags & FR_ACCOUNT)
+		fgp = &ipfgroups[1][set];
+	else if (flags & (FR_OUTQUE|FR_INQUE))
+		fgp = &ipfgroups[0][set];
+	else
+		return NULL;
+	num &= 0xffff;
+
+	while ((fg = *fgp))
+		if (fg->fg_num == num)
+			break;
+		else
+			fgp = &fg->fg_next;
+	if (fgpp)
+		*fgpp = fgp;
+	return fg;
+}
+
+
+frgroup_t *fr_addgroup(num, fp, which, set)
+u_int num;
+frentry_t *fp;
+minor_t which;
+int set;
+{
+	frgroup_t *fg, **fgp;
+
+	if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
+		return fg;
+
+	KMALLOC(fg, frgroup_t *);
+	if (fg) {
+		fg->fg_num = num & 0xffff;
+		fg->fg_next = *fgp;
+		fg->fg_head = fp;
+		fg->fg_start = &fp->fr_grp;
+		*fgp = fg;
+	}
+	return fg;
+}
+
+
+void fr_delgroup(num, flags, which, set)
+u_int num;
+u_32_t flags;
+minor_t which;
+int set;
+{
+	frgroup_t *fg, **fgp;
+ 
+	if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
+		return;
+ 
+	*fgp = fg->fg_next;
+	KFREE(fg);
+}
+
+
+
+/*
+ * recursively flush rules from the list, descending groups as they are
+ * encountered.  if a rule is the head of a group and it has lost all its
+ * group members, then also delete the group reference.
+ */
+static int frflushlist(set, unit, nfreedp, listp)
+int set;
+minor_t unit;
+int *nfreedp;
+frentry_t **listp;
+{
+	register int freed = 0, i;
+	register frentry_t *fp;
+
+	while ((fp = *listp)) {
+		*listp = fp->fr_next;
+		if (fp->fr_grp) {
+			i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
+			MUTEX_ENTER(&ipf_rw);
+			fp->fr_ref -= i;
+			MUTEX_EXIT(&ipf_rw);
+		}
+
+		ATOMIC_DEC(fp->fr_ref);
+		if (fp->fr_ref == 0) {
+			if (fp->fr_grhead)
+				fr_delgroup((u_int)fp->fr_grhead, fp->fr_flags, 
+					    unit, set);
+			KFREE(fp);
+		} else
+			fp->fr_next = NULL;
+		freed++;
+	}
+	*nfreedp += freed;
+	return freed;
+}
+
+
+int frflush(unit, flags)
+minor_t unit;
+int flags;
+{
+	int flushed = 0, set;
+
+	if (unit != IPL_LOGIPF)
+		return 0;
+	WRITE_ENTER(&ipf_mutex);
+	bzero((char *)frcache, sizeof(frcache[0]) * 2);
+
+	set = fr_active;
+	if (flags & FR_INACTIVE)
+		set = 1 - set;
+
+	if (flags & FR_OUTQUE) {
+		(void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
+		(void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
+	}
+	if (flags & FR_INQUE) {
+		(void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
+		(void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
+	}
+	RWLOCK_EXIT(&ipf_mutex);
+	return flushed;
+}
+
+
+char *memstr(src, dst, slen, dlen)
+char *src, *dst;
+int slen, dlen;
+{
+	char *s = NULL;
+
+	while (dlen >= slen) {
+		if (bcmp(src, dst, slen) == 0) {
+			s = dst;
+			break;
+		}
+		dst++;
+		dlen--;
+	}
+	return s;
+}
+
+
+void fixskip(listp, rp, addremove)
+frentry_t **listp, *rp;
+int addremove;
+{
+	frentry_t *fp;
+	int rules = 0, rn = 0;
+
+	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
+		;
+
+	if (!fp)
+		return;
+
+	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
+		if (fp->fr_skip && (rn + fp->fr_skip >= rules))
+			fp->fr_skip += addremove;
+}
+
+
+#ifdef	_KERNEL
+/*
+ * count consecutive 1's in bit mask.  If the mask generated by counting
+ * consecutive 1's is different to that passed, return -1, else return #
+ * of bits.
+ */
+int	countbits(ip)
+u_32_t	ip;
+{
+	u_32_t	ipn;
+	int	cnt = 0, i, j;
+
+	ip = ipn = ntohl(ip);
+	for (i = 32; i; i--, ipn *= 2)
+		if (ipn & 0x80000000)
+			cnt++;
+		else
+			break;
+	ipn = 0;
+	for (i = 32, j = cnt; i; i--, j--) {
+		ipn *= 2;
+		if (j > 0)
+			ipn++;
+	}
+	if (ipn == ip)
+		return cnt;
+	return -1;
+}
+
+
+/*
+ * return the first IP Address associated with an interface
+ */
+int fr_ifpaddr(ifptr, inp)
+void *ifptr;
+struct in_addr *inp;
+{
+# if SOLARIS
+	ill_t *ill = ifptr;
+# else
+	struct ifnet *ifp = ifptr;
+# endif
+	struct in_addr in;
+
+# if SOLARIS
+	in.s_addr = ill->ill_ipif->ipif_local_addr;
+# else /* SOLARIS */
+#  if linux
+	;
+#  else /* linux */
+	struct ifaddr *ifa;
+	struct sockaddr_in *sin;
+
+#   if	(__FreeBSD_version >= 300000)
+	ifa = TAILQ_FIRST(&ifp->if_addrhead);
+#   else
+#    if defined(__NetBSD__) || defined(__OpenBSD__)
+	ifa = ifp->if_addrlist.tqh_first;
+#    else
+#     if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
+	ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
+#     else
+	ifa = ifp->if_addrlist;
+#     endif
+#    endif /* __NetBSD__ || __OpenBSD__ */
+#   endif /* __FreeBSD_version >= 300000 */
+#   if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
+	sin = (struct sockaddr_in *)&ifa->ifa_addr;
+#   else
+	sin = (struct sockaddr_in *)ifa->ifa_addr;
+	while (sin && ifa &&
+	       sin->sin_family != AF_INET) {
+#    if	(__FreeBSD_version >= 300000)
+		ifa = TAILQ_NEXT(ifa, ifa_link);
+#    else
+#     if defined(__NetBSD__) || defined(__OpenBSD__)
+		ifa = ifa->ifa_list.tqe_next;
+#     else
+		ifa = ifa->ifa_next;
+#     endif
+#    endif /* __FreeBSD_version >= 300000 */
+		if (ifa)
+			sin = (struct sockaddr_in *)ifa->ifa_addr;
+	}
+	if (ifa == NULL)
+		sin = NULL;
+	if (sin == NULL)
+		return -1;
+#   endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
+	in = sin->sin_addr;
+#  endif /* linux */
+# endif /* SOLARIS */
+	in.s_addr = ntohl(in.s_addr);
+	*inp = in;
+	return 0;
+}
+#else
+
+
+/*
+ * return the first IP Address associated with an interface
+ */
+int fr_ifpaddr(ifptr, inp)
+void *ifptr;
+struct in_addr *inp;
+{
+	return 0;
+}
+#endif       
diff --git a/sys/contrib/ipfilter/netinet/ip_auth.c b/sys/contrib/ipfilter/netinet/ip_auth.c
new file mode 100644
index 0000000..d8207a0
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_auth.c
@@ -0,0 +1,538 @@
+/*
+ * Copyright (C) 1998 by Darren Reed & Guido van Rooij.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+/*static const char rcsid[] = "@(#)$Id: ip_auth.c,v 2.1.2.1 1999/09/28 11:44:04 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+#endif
+#if defined(KERNEL) && (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/uio.h>
+#ifndef linux
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(_KERNEL) && !defined(linux)
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/filio.h>
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+#  include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+#if _BSDI_VERSION >= 199802
+# include <sys/queue.h>
+#endif
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(bsdi)
+# include <machine/cpu.h>
+#endif
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#ifndef	KERNEL
+# define	KERNEL
+# define	NOT_KERNEL
+#endif
+#ifndef linux
+# include <netinet/ip_var.h>
+#endif
+#ifdef	NOT_KERNEL
+# undef	KERNEL
+#endif
+#ifdef __sgi
+# ifdef IFF_DRVRLOCK /* IRIX6 */
+#  include <sys/hashing.h>
+# endif
+#endif
+#include <netinet/tcp.h>
+#if defined(__sgi) && !defined(IFF_DRVRLOCK) /* IRIX < 6 */
+extern struct ifqueue   ipintrq;                /* ip packet input queue */
+#else
+# ifndef linux
+#  if __FreeBSD_version >= 300000
+#   include <net/if_var.h>
+#  endif
+#  include <netinet/in_var.h>
+#  include <netinet/tcp_fsm.h>
+# endif
+#endif
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_auth.h"
+#if !SOLARIS && !defined(linux)
+# include <net/netisr.h>
+# ifdef __FreeBSD__
+#  include <machine/cpufunc.h>
+# endif
+#endif
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+# if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
+#  include <sys/libkern.h>
+#  include <sys/systm.h>
+# endif
+#endif
+
+
+
+#if (SOLARIS || defined(__sgi)) && defined(_KERNEL)
+extern KRWLOCK_T ipf_auth;
+extern kmutex_t ipf_authmx;
+# if SOLARIS
+extern kcondvar_t ipfauthwait;
+# endif
+#endif
+#ifdef linux
+static struct wait_queue *ipfauthwait = NULL;
+#endif
+
+int	fr_authsize = FR_NUMAUTH;
+int	fr_authused = 0;
+int	fr_defaultauthage = 600;
+fr_authstat_t	fr_authstats;
+static frauth_t fr_auth[FR_NUMAUTH];
+mb_t	*fr_authpkts[FR_NUMAUTH];
+static int	fr_authstart = 0, fr_authend = 0, fr_authnext = 0;
+static frauthent_t	*fae_list = NULL;
+frentry_t	*ipauth = NULL;
+
+
+/*
+ * Check if a packet has authorization.  If the packet is found to match an
+ * authorization result and that would result in a feedback loop (i.e. it
+ * will end up returning FR_AUTH) then return FR_BLOCK instead.
+ */
+u_32_t fr_checkauth(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	u_short id = ip->ip_id;
+	u_32_t pass;
+	int i;
+
+	READ_ENTER(&ipf_auth);
+	for (i = fr_authstart; i != fr_authend; ) {
+		/*
+		 * index becomes -2 only after an SIOCAUTHW.  Check this in
+		 * case the same packet gets sent again and it hasn't yet been
+		 * auth'd.
+		 */
+		if ((fr_auth[i].fra_index == -2) &&
+		    (id == fr_auth[i].fra_info.fin_id) &&
+		    !bcmp((char *)fin,(char *)&fr_auth[i].fra_info,FI_CSIZE)) {
+			/*
+			 * Avoid feedback loop.
+			 */
+			if (!(pass = fr_auth[i].fra_pass) || (pass & FR_AUTH))
+				pass = FR_BLOCK;
+			RWLOCK_EXIT(&ipf_auth);
+			WRITE_ENTER(&ipf_auth);
+			fr_authstats.fas_hits++;
+			fr_auth[i].fra_index = -1;
+			fr_authused--;
+			if (i == fr_authstart) {
+				while (fr_auth[i].fra_index == -1) {
+					i++;
+					if (i == FR_NUMAUTH)
+						i = 0;
+					fr_authstart = i;
+					if (i == fr_authend)
+						break;
+				}
+				if (fr_authstart == fr_authend) {
+					fr_authnext = 0;
+					fr_authstart = fr_authend = 0;
+				}
+			}
+			RWLOCK_EXIT(&ipf_auth);
+			return pass;
+		}
+		i++;
+		if (i == FR_NUMAUTH)
+			i = 0;
+	}
+	fr_authstats.fas_miss++;
+	RWLOCK_EXIT(&ipf_auth);
+	return 0;
+}
+
+
+/*
+ * Check if we have room in the auth array to hold details for another packet.
+ * If we do, store it and wake up any user programs which are waiting to
+ * hear about these events.
+ */
+int fr_newauth(m, fin, ip
+#if defined(_KERNEL) && SOLARIS
+, qif)
+qif_t *qif;
+#else
+)
+#endif
+mb_t *m;
+fr_info_t *fin;
+ip_t *ip;
+{
+	int i;
+
+	WRITE_ENTER(&ipf_auth);
+	if (fr_authstart > fr_authend) {
+		fr_authstats.fas_nospace++;
+		RWLOCK_EXIT(&ipf_auth);
+		return 0;
+	} else {
+		if ((fr_authstart == 0) && (fr_authend == FR_NUMAUTH - 1)) {
+			fr_authstats.fas_nospace++;
+			RWLOCK_EXIT(&ipf_auth);
+			return 0;
+		}
+	}
+
+	fr_authstats.fas_added++;
+	fr_authused++;
+	i = fr_authend++;
+	if (fr_authend == FR_NUMAUTH)
+		fr_authend = 0;
+	RWLOCK_EXIT(&ipf_auth);
+	fr_auth[i].fra_index = i;
+	fr_auth[i].fra_pass = 0;
+	fr_auth[i].fra_age = fr_defaultauthage;
+	bcopy((char *)fin, (char *)&fr_auth[i].fra_info, sizeof(*fin));
+#if !defined(sparc) && !defined(m68k)
+	/*
+	 * No need to copyback here as we want to undo the changes, not keep
+	 * them.
+	 */
+# if SOLARIS && defined(_KERNEL)
+	if (ip == (ip_t *)m->b_rptr)
+# endif
+	{
+		register u_short bo;
+
+		bo = ip->ip_len;
+		ip->ip_len = htons(bo);
+# if !SOLARIS	/* 4.4BSD converts this ip_input.c, but I don't in solaris.c */
+		bo = ip->ip_id;
+		ip->ip_id = htons(bo);
+# endif
+		bo = ip->ip_off;
+		ip->ip_off = htons(bo);
+	}
+#endif
+#if SOLARIS && defined(_KERNEL)
+	m->b_rptr -= qif->qf_off;
+	fr_authpkts[i] = *(mblk_t **)fin->fin_mp;
+	fr_auth[i].fra_q = qif->qf_q;
+	cv_signal(&ipfauthwait);
+#else
+	fr_authpkts[i] = m;
+# if defined(linux) && defined(_KERNEL)
+	wake_up_interruptible(&ipfauthwait);
+# else
+	WAKEUP(&fr_authnext);
+# endif
+#endif
+	return 1;
+}
+
+
+int fr_auth_ioctl(data, cmd, fr, frptr)
+caddr_t data;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || (FreeBSD_version >= 300003)
+u_long cmd;
+#else
+int cmd;
+#endif
+frentry_t *fr, **frptr;
+{
+	mb_t *m;
+#if defined(_KERNEL)
+# if !SOLARIS
+	struct ifqueue *ifq;
+	int s;
+# endif
+#endif
+	frauth_t auth, *au = &auth;
+	frauthent_t *fae, **faep;
+	int i, error = 0;
+
+	switch (cmd)
+	{
+	case SIOCINIFR :
+	case SIOCRMIFR :
+	case SIOCADIFR :
+		error = EINVAL;
+		break;
+	case SIOCINAFR :
+	case SIOCRMAFR :
+	case SIOCADAFR :
+		for (faep = &fae_list; (fae = *faep); )
+			if (&fae->fae_fr == fr)
+				break;
+			else
+				faep = &fae->fae_next;
+		if (cmd == SIOCRMAFR) {
+			if (!fae)
+				error = ESRCH;
+			else {
+				WRITE_ENTER(&ipf_auth);
+				*faep = fae->fae_next;
+				*frptr = fr->fr_next;
+				RWLOCK_EXIT(&ipf_auth);
+				KFREE(fae);
+			}
+		} else {
+			KMALLOC(fae, frauthent_t *);
+			if (fae != NULL) {
+				IRCOPY((char *)data, (char *)&fae->fae_fr,
+				       sizeof(fae->fae_fr));
+				WRITE_ENTER(&ipf_auth);
+				fae->fae_age = fr_defaultauthage;
+				fae->fae_fr.fr_hits = 0;
+				fae->fae_fr.fr_next = *frptr;
+				*frptr = &fae->fae_fr;
+				fae->fae_next = *faep;
+				*faep = fae;
+				ipauth = &fae_list->fae_fr;
+				RWLOCK_EXIT(&ipf_auth);
+			} else
+				error = ENOMEM;
+		}
+		break;
+	case SIOCATHST:
+		READ_ENTER(&ipf_auth);
+		fr_authstats.fas_faelist = fae_list;
+		RWLOCK_EXIT(&ipf_auth);
+		IWCOPY((char *)&fr_authstats, data, sizeof(fr_authstats));
+		break;
+	case SIOCAUTHW:
+fr_authioctlloop:
+		READ_ENTER(&ipf_auth);
+		if ((fr_authnext != fr_authend) && fr_authpkts[fr_authnext]) {
+			IWCOPY((char *)&fr_auth[fr_authnext], data,
+			       sizeof(fr_info_t));
+			RWLOCK_EXIT(&ipf_auth);
+			WRITE_ENTER(&ipf_auth);
+			fr_authnext++;
+			if (fr_authnext == FR_NUMAUTH)
+				fr_authnext = 0;
+			RWLOCK_EXIT(&ipf_auth);
+			return 0;
+		}
+#ifdef	_KERNEL
+# if	SOLARIS
+		mutex_enter(&ipf_authmx);
+		if (!cv_wait_sig(&ipfauthwait, &ipf_authmx)) {
+			mutex_exit(&ipf_authmx);
+			return EINTR;
+		}
+		mutex_exit(&ipf_authmx);
+# else
+#  ifdef linux
+		interruptible_sleep_on(&ipfauthwait);
+		if (current->signal & ~current->blocked)
+			error = -EINTR;
+#  else
+		error = SLEEP(&fr_authnext, "fr_authnext");
+# endif
+# endif
+#endif
+		RWLOCK_EXIT(&ipf_auth);
+		if (!error)
+			goto fr_authioctlloop;
+		break;
+	case SIOCAUTHR:
+		IRCOPY(data, (caddr_t)&auth, sizeof(auth));
+		WRITE_ENTER(&ipf_auth);
+		i = au->fra_index;
+		if ((i < 0) || (i > FR_NUMAUTH) ||
+		    (fr_auth[i].fra_info.fin_id != au->fra_info.fin_id)) {
+			RWLOCK_EXIT(&ipf_auth);
+			return EINVAL;
+		}
+		m = fr_authpkts[i];
+		fr_auth[i].fra_index = -2;
+		fr_auth[i].fra_pass = au->fra_pass;
+		fr_authpkts[i] = NULL;
+#ifdef	_KERNEL
+		RWLOCK_EXIT(&ipf_auth);
+		SPL_NET(s);
+# ifndef linux
+		if (m && au->fra_info.fin_out) {
+#  if SOLARIS
+			error = fr_qout(fr_auth[i].fra_q, m);
+#  else /* SOLARIS */
+#   if _BSDI_VERSION >= 199802
+			error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL,
+					  NULL);
+#   else
+			error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL);
+#   endif
+#  endif /* SOLARIS */
+			if (error)
+				fr_authstats.fas_sendfail++;
+			else
+				fr_authstats.fas_sendok++;
+		} else if (m) {
+# if SOLARIS
+			error = fr_qin(fr_auth[i].fra_q, m);
+# else /* SOLARIS */
+			ifq = &ipintrq;
+			if (IF_QFULL(ifq)) {
+				IF_DROP(ifq);
+				m_freem(m);
+				error = ENOBUFS;
+			} else {
+				IF_ENQUEUE(ifq, m);
+				schednetisr(NETISR_IP);
+			}
+# endif /* SOLARIS */
+			if (error)
+				fr_authstats.fas_quefail++;
+			else
+				fr_authstats.fas_queok++;
+		} else
+			error = EINVAL;
+# endif
+# if SOLARIS
+		if (error)
+			error = EINVAL;
+# else
+		/*
+		 * If we experience an error which will result in the packet
+		 * not being processed, make sure we advance to the next one.
+		 */ 
+		if (error == ENOBUFS) {
+			fr_authused--;
+			fr_auth[i].fra_index = -1;
+			fr_auth[i].fra_pass = 0;
+			if (i == fr_authstart) {
+				while (fr_auth[i].fra_index == -1) {
+					i++;
+					if (i == FR_NUMAUTH)
+						i = 0;
+					fr_authstart = i;
+					if (i == fr_authend)
+						break;
+				}
+				if (fr_authstart == fr_authend) {
+					fr_authnext = 0;
+					fr_authstart = fr_authend = 0;
+				}
+			}
+		}
+# endif
+		SPL_X(s);
+#endif /* _KERNEL */
+		break;
+	default :
+		error = EINVAL;
+		break;
+	}
+	return error;
+}
+
+
+#ifdef	_KERNEL
+/*
+ * Free all network buffer memory used to keep saved packets.
+ */
+void fr_authunload()
+{
+	register int i;
+	register frauthent_t *fae, **faep;
+	mb_t *m;
+
+	WRITE_ENTER(&ipf_auth);
+	for (i = 0; i < FR_NUMAUTH; i++) {
+		if ((m = fr_authpkts[i])) {
+			FREE_MB_T(m);
+			fr_authpkts[i] = NULL;
+			fr_auth[i].fra_index = -1;
+		}
+	}
+
+
+	for (faep = &fae_list; (fae = *faep); ) {
+		*faep = fae->fae_next;
+		KFREE(fae);
+	}
+	ipauth = NULL;
+	RWLOCK_EXIT(&ipf_auth);
+}
+
+
+/*
+ * Slowly expire held auth records.  Timeouts are set
+ * in expectation of this being called twice per second.
+ */
+void fr_authexpire()
+{
+	register int i;
+	register frauth_t *fra;
+	register frauthent_t *fae, **faep;
+	mb_t *m;
+#if !SOLARIS
+	int s;
+#endif
+
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_auth);
+	for (i = 0, fra = fr_auth; i < FR_NUMAUTH; i++, fra++) {
+		if ((!--fra->fra_age) && (m = fr_authpkts[i])) {
+			FREE_MB_T(m);
+			fr_authpkts[i] = NULL;
+			fr_auth[i].fra_index = -1;
+			fr_authstats.fas_expire++;
+			fr_authused--;
+		}
+	}
+
+	for (faep = &fae_list; (fae = *faep); ) {
+		if (!--fae->fae_age) {
+			*faep = fae->fae_next;
+			KFREE(fae);
+			fr_authstats.fas_expire++;
+		} else
+			faep = &fae->fae_next;
+	}
+	ipauth = &fae_list->fae_fr;
+	RWLOCK_EXIT(&ipf_auth);
+	SPL_X(s);
+}
+#endif
diff --git a/sys/contrib/ipfilter/netinet/ip_auth.h b/sys/contrib/ipfilter/netinet/ip_auth.h
new file mode 100644
index 0000000..a7c640b
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_auth.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 1997-1998 by Darren Reed & Guido Van Rooij.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * $Id: ip_auth.h,v 2.1 1999/08/04 17:29:54 darrenr Exp $
+ *
+ * $FreeBSD$
+ */
+#ifndef	__IP_AUTH_H__
+#define	__IP_AUTH_H__
+
+#define FR_NUMAUTH      32
+
+typedef struct  frauth {
+	int	fra_age;
+	int	fra_index;
+	u_32_t	fra_pass;
+	fr_info_t	fra_info;
+#if SOLARIS
+	queue_t	*fra_q;
+#endif
+} frauth_t;
+
+typedef	struct	frauthent  {
+	struct	frentry	fae_fr;
+	struct	frauthent	*fae_next;
+	u_long	fae_age;
+} frauthent_t;
+
+typedef struct  fr_authstat {
+	U_QUAD_T	fas_hits;
+	U_QUAD_T	fas_miss;
+	u_long		fas_nospace;
+	u_long		fas_added;
+	u_long		fas_sendfail;
+	u_long		fas_sendok;
+	u_long		fas_queok;
+	u_long		fas_quefail;
+	u_long		fas_expire;
+	frauthent_t	*fas_faelist;
+} fr_authstat_t;
+
+
+extern	frentry_t	*ipauth;
+extern	struct fr_authstat	fr_authstats;
+extern	int	fr_defaultauthage;
+extern	int	fr_authstart;
+extern	int	fr_authend;
+extern	int	fr_authsize;
+extern	int	fr_authused;
+extern	u_32_t	fr_checkauth __P((ip_t *, fr_info_t *));
+extern	void	fr_authexpire __P((void));
+extern	void	fr_authunload __P((void));
+extern	mb_t	*fr_authpkts[];
+#if defined(_KERNEL) && SOLARIS
+extern	int	fr_newauth __P((mb_t *, fr_info_t *, ip_t *, qif_t *));
+#else
+extern	int	fr_newauth __P((mb_t *, fr_info_t *, ip_t *));
+#endif
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+extern	int	fr_auth_ioctl __P((caddr_t, u_long, frentry_t *, frentry_t **));
+#else
+extern	int	fr_auth_ioctl __P((caddr_t, int, frentry_t *, frentry_t **));
+#endif
+#endif	/* __IP_AUTH_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_compat.h b/sys/contrib/ipfilter/netinet/ip_compat.h
new file mode 100644
index 0000000..d1a94a2
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_compat.h
@@ -0,0 +1,839 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_compat.h	1.8 1/14/96
+ * $Id: ip_compat.h,v 2.1.2.1 1999/09/18 15:03:51 darrenr Exp $
+ * $FreeBSD$
+ */
+
+#ifndef	__IP_COMPAT_H__
+#define	__IP_COMPAT_H__
+
+#ifndef	__P
+# ifdef	__STDC__
+#  define	__P(x)  x
+# else
+#  define	__P(x)  ()
+# endif
+#endif
+#ifndef	__STDC__
+# undef		const
+# define	const
+#endif
+
+#ifndef	SOLARIS
+#define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(_KERNEL) || defined(KERNEL) || defined(__KERNEL__)
+# undef	KERNEL
+# undef	_KERNEL
+# undef 	__KERNEL__
+# define	KERNEL
+# define	_KERNEL
+# define 	__KERNEL__
+#endif
+
+#if defined(__SVR4) || defined(__svr4__) || defined(__sgi)
+#define index   strchr
+# if !defined(KERNEL)
+#  define	bzero(a,b)	memset(a,0,b)
+#  define	bcmp		memcmp
+#  define	bcopy(a,b,c)	memmove(b,a,c)
+# endif
+#endif
+
+#ifndef offsetof
+#define offsetof(t,m) (int)((&((t *)0L)->m))
+#endif
+
+#if defined(__sgi) || defined(bsdi)
+struct  ether_addr {
+        u_char  ether_addr_octet[6];
+};
+#endif
+
+#if defined(__sgi) && !defined(IPFILTER_LKM)
+# ifdef __STDC__
+#  define IPL_EXTERN(ep) ipfilter##ep
+# else
+#  define IPL_EXTERN(ep) ipfilter/**/ep
+# endif
+#else
+# ifdef __STDC__
+#  define IPL_EXTERN(ep) ipl##ep
+# else
+#  define IPL_EXTERN(ep) ipl/**/ep
+# endif
+#endif
+
+#ifdef	linux
+# include <sys/sysmacros.h>
+#endif
+#if	SOLARIS
+# define	MTYPE(m)	((m)->b_datap->db_type)
+# include	<sys/isa_defs.h>
+# include	<sys/ioccom.h>
+# include	<sys/sysmacros.h>
+# include	<sys/kmem.h>
+/*
+ * because Solaris 2 defines these in two places :-/
+ */
+# undef	IPOPT_EOL
+# undef	IPOPT_NOP
+# undef	IPOPT_LSRR
+# undef	IPOPT_RR
+# undef	IPOPT_SSRR
+# ifndef	KERNEL
+#  define	_KERNEL
+#  undef	RES_INIT
+#  include <inet/common.h>
+#  include <inet/ip.h>
+#  include <inet/ip_ire.h>
+#  undef	_KERNEL
+# else /* _KERNEL */
+#  include <inet/common.h>
+#  include <inet/ip.h>
+#  include <inet/ip_ire.h>
+# endif /* _KERNEL */
+#else
+# if !defined(__sgi)
+typedef	 int	minor_t;
+#endif
+#endif /* SOLARIS */
+#define	IPMINLEN(i, h)	((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
+
+#ifndef	IP_OFFMASK
+#define	IP_OFFMASK	0x1fff
+#endif
+
+#if	BSD > 199306
+# define	USE_QUAD_T
+# define	U_QUAD_T	u_quad_t
+# define	QUAD_T		quad_t
+#else /* BSD > 199306 */
+# define	U_QUAD_T	u_long
+# define	QUAD_T		long
+#endif /* BSD > 199306 */
+
+/*
+ * These operating systems already take care of the problem for us.
+ */
+#if defined(__NetBSD__) || defined(__OpenBSD__) || defined(__FreeBSD__) || \
+    defined(__sgi)
+typedef u_int32_t       u_32_t;
+#else
+/*
+ * Really, any arch where sizeof(long) != sizeof(int).
+ */
+# if defined(__alpha__) || defined(__alpha) || defined(_LP64)
+typedef unsigned int    u_32_t;
+# else
+typedef unsigned long   u_32_t;
+# endif
+#endif /* __NetBSD__ || __OpenBSD__ || __FreeBSD__ || __sgi */
+
+#ifndef	MAX
+#define	MAX(a,b)	(((a) > (b)) ? (a) : (b))
+#endif
+
+/*
+ * Security Options for Intenet Protocol (IPSO) as defined in RFC 1108.
+ *
+ * Basic Option
+ *
+ * 00000001   -   (Reserved 4)
+ * 00111101   -   Top Secret
+ * 01011010   -   Secret
+ * 10010110   -   Confidential
+ * 01100110   -   (Reserved 3)
+ * 11001100   -   (Reserved 2)
+ * 10101011   -   Unclassified
+ * 11110001   -   (Reserved 1)
+ */
+#define	IPSO_CLASS_RES4		0x01
+#define	IPSO_CLASS_TOPS		0x3d
+#define	IPSO_CLASS_SECR		0x5a
+#define	IPSO_CLASS_CONF		0x96
+#define	IPSO_CLASS_RES3		0x66
+#define	IPSO_CLASS_RES2		0xcc
+#define	IPSO_CLASS_UNCL		0xab
+#define	IPSO_CLASS_RES1		0xf1
+
+#define	IPSO_AUTH_GENSER	0x80
+#define	IPSO_AUTH_ESI		0x40
+#define	IPSO_AUTH_SCI		0x20
+#define	IPSO_AUTH_NSA		0x10
+#define	IPSO_AUTH_DOE		0x08
+#define	IPSO_AUTH_UN		0x06
+#define	IPSO_AUTH_FTE		0x01
+
+/*
+ * IP option #defines
+ */
+/*#define	IPOPT_RR	7 */
+#define	IPOPT_ZSU	10	/* ZSU */
+#define	IPOPT_MTUP	11	/* MTUP */
+#define	IPOPT_MTUR	12	/* MTUR */
+#define	IPOPT_ENCODE	15	/* ENCODE */
+/*#define	IPOPT_TS	68 */
+#define	IPOPT_TR	82	/* TR */
+/*#define	IPOPT_SECURITY	130 */
+/*#define	IPOPT_LSRR	131 */
+#define	IPOPT_E_SEC	133	/* E-SEC */
+#define	IPOPT_CIPSO	134	/* CIPSO */
+/*#define	IPOPT_SATID	136 */
+#ifndef	IPOPT_SID
+# define	IPOPT_SID	IPOPT_SATID
+#endif
+/*#define	IPOPT_SSRR	137 */
+#define	IPOPT_ADDEXT	147	/* ADDEXT */
+#define	IPOPT_VISA	142	/* VISA */
+#define	IPOPT_IMITD	144	/* IMITD */
+#define	IPOPT_EIP	145	/* EIP */
+#define	IPOPT_FINN	205	/* FINN */
+
+
+#if defined(__FreeBSD__) && defined(KERNEL)
+# if __FreeBSD__ < 3
+#  include <machine/spl.h>
+# else
+#  if __FreeBSD__ == 3
+#   if defined(IPFILTER_LKM) && !defined(ACTUALLY_LKM_NOT_KERNEL)
+#    define	ACTUALLY_LKM_NOT_KERNEL
+#   endif
+#  else
+#   if defined(IPFILTER_LKM) && !defined(KLD_MODULE)
+#    define	KLD_MODULE
+#   endif
+#  endif
+# endif
+#endif /* __FreeBSD__ && KERNEL */
+
+/*
+ * Build some macros and #defines to enable the same code to compile anywhere
+ * Well, that's the idea, anyway :-)
+ */
+#ifdef KERNEL
+# if SOLARIS
+#  define	ATOMIC_INC(x)		{ mutex_enter(&ipf_rw); (x)++; \
+					  mutex_exit(&ipf_rw); }
+#  define	ATOMIC_DEC(x)		{ mutex_enter(&ipf_rw); (x)--; \
+					  mutex_exit(&ipf_rw); }
+#  define	MUTEX_ENTER(x)		mutex_enter(x)
+#  if 1
+#   define	KRWLOCK_T		krwlock_t
+#   define	READ_ENTER(x)		rw_enter(x, RW_READER)
+#   define	WRITE_ENTER(x)		rw_enter(x, RW_WRITER)
+#   define	RW_UPGRADE(x)		{ if (rw_tryupgrade(x) == 0) { \
+					      rw_exit(x); \
+					      rw_enter(x, RW_WRITER); } \
+					}
+#   define	MUTEX_DOWNGRADE(x)	rw_downgrade(x)
+#   define	RWLOCK_INIT(x, y, z)	rw_init((x), (y), RW_DRIVER, (z))
+#   define	RWLOCK_EXIT(x)		rw_exit(x)
+#   define	RW_DESTROY(x)		rw_destroy(x)
+#  else
+#   define	KRWLOCK_T		kmutex_t
+#   define	READ_ENTER(x)		mutex_enter(x)
+#   define	WRITE_ENTER(x)		mutex_enter(x)
+#   define	MUTEX_DOWNGRADE(x)	;
+#   define	RWLOCK_INIT(x, y, z)	mutex_init((x), (y), MUTEX_DRIVER, (z))
+#   define	RWLOCK_EXIT(x)		mutex_exit(x)
+#   define	RW_DESTROY(x)		mutex_destroy(x)
+#  endif
+#  define	MUTEX_EXIT(x)	mutex_exit(x)
+#  define	MTOD(m,t)	(t)((m)->b_rptr)
+#  define	IRCOPY(a,b,c)	copyin((a), (b), (c))
+#  define	IWCOPY(a,b,c)	copyout((a), (b), (c))
+#  define	FREE_MB_T(m)	freemsg(m)
+#  define	SPL_NET(x)	;
+#  define	SPL_IMP(x)	;
+#  undef	SPL_X
+#  define	SPL_X(x)	;
+#  ifdef sparc
+#   define	ntohs(x)	(x)
+#   define	ntohl(x)	(x)
+#   define	htons(x)	(x)
+#   define	htonl(x)	(x)
+#  endif /* sparc */
+#  define	KMALLOC(a,b)	(a) = (b)kmem_alloc(sizeof(*(a)), KM_NOSLEEP)
+#  define	KMALLOCS(a,b,c)	(a) = (b)kmem_alloc((c), KM_NOSLEEP)
+#  define	GET_MINOR(x)	getminor(x)
+typedef	struct	qif	{
+	struct	qif	*qf_next;
+	ill_t	*qf_ill;
+	kmutex_t	qf_lock;
+	void	*qf_iptr;
+	void	*qf_optr;
+	queue_t	*qf_in;
+	queue_t	*qf_out;
+	struct	qinit	*qf_wqinfo;
+	struct	qinit	*qf_rqinfo;
+	struct	qinit	qf_wqinit;
+	struct	qinit	qf_rqinit;
+	mblk_t	*qf_m;	/* These three fields are for passing data up from */
+	queue_t	*qf_q;	/* fr_qin and fr_qout to the packet processing. */
+	size_t	qf_off;
+	size_t	qf_len;	/* this field is used for in ipfr_fastroute */
+	char	qf_name[8];
+	/*
+	 * in case the ILL has disappeared...
+	 */
+	size_t	qf_hl;	/* header length */
+} qif_t;
+extern	ill_t	*get_unit __P((char *));
+#  define	GETUNIT(n)	get_unit((n))
+# else /* SOLARIS */
+#  if defined(__sgi)
+#   define  hz HZ
+#   include <sys/ksynch.h>
+#   define	IPF_LOCK_PL	plhi
+#   include <sys/sema.h>
+#undef kmutex_t
+typedef struct {
+	lock_t *l;
+	int pl;
+} kmutex_t;
+#   define	ATOMIC_INC(x)		{ MUTEX_ENTER(&ipf_rw); \
+					  (x)++; MUTEX_EXIT(&ipf_rw); }
+#   define	ATOMIC_DEC(x)		{ MUTEX_ENTER(&ipf_rw); \
+					  (x)--; MUTEX_EXIT(&ipf_rw); }
+#   define	MUTEX_ENTER(x)		(x)->pl = LOCK((x)->l, IPF_LOCK_PL);
+#   define	KRWLOCK_T		kmutex_t
+#   define	READ_ENTER(x)		MUTEX_ENTER(x)
+#   define	WRITE_ENTER(x)		MUTEX_ENTER(x)
+#   define	RW_UPGRADE(x)		;
+#   define	MUTEX_DOWNGRADE(x)	;
+#   define	RWLOCK_EXIT(x)	MUTEX_EXIT(x)
+#   define	MUTEX_EXIT(x)	UNLOCK((x)->l, (x)->pl);
+#  else /* __sgi */
+#   define	ATOMIC_INC(x)		(x)++
+#   define	ATOMIC_DEC(x)		(x)--
+#   define	MUTEX_ENTER(x)		;
+#   define	READ_ENTER(x)	;
+#   define	WRITE_ENTER(x)	;
+#   define	RW_UPGRADE(x)	;
+#   define	MUTEX_DOWNGRADE(x)	;
+#   define	RWLOCK_EXIT(x)	;
+#   define	MUTEX_EXIT(x)	;
+#  endif /* __sgi */
+#  ifndef linux
+#   define	FREE_MB_T(m)	m_freem(m)
+#   define	MTOD(m,t)	mtod(m,t)
+#   define	IRCOPY(a,b,c)	bcopy((a), (b), (c))
+#   define	IWCOPY(a,b,c)	bcopy((a), (b), (c))
+#  endif /* !linux */
+# endif /* SOLARIS */
+
+# ifdef sun
+#  if !SOLARIS
+#   include	<sys/kmem_alloc.h>
+#   define	GETUNIT(n)	ifunit((n), IFNAMSIZ)
+#  endif
+# else
+#  ifndef	linux
+#   define	GETUNIT(n)	ifunit((n))
+#  endif
+# endif /* sun */
+
+# if defined(sun) && !defined(linux) || defined(__sgi)
+#  define	UIOMOVE(a,b,c,d)	uiomove((caddr_t)a,b,c,d)
+#  define	SLEEP(id, n)	sleep((id), PZERO+1)
+#  define	WAKEUP(id)	wakeup(id)
+#  define	KFREE(x)	kmem_free((char *)(x), sizeof(*(x)))
+#  define	KFREES(x,s)	kmem_free((char *)(x), (s))
+#  if !SOLARIS
+extern	void	m_copydata __P((struct mbuf *, int, int, caddr_t));
+extern	void	m_copyback __P((struct mbuf *, int, int, caddr_t));
+#  endif
+#  ifdef __sgi
+#   include <sys/kmem.h>
+#   include <sys/ddi.h>
+#   define	KMALLOC(a,b)	(a) = (b)kmem_alloc(sizeof(*(a)), KM_NOSLEEP)
+#   define	KMALLOCS(a,b,c)	(a) = (b)kmem_alloc((c), KM_NOSLEEP)
+#   define	GET_MINOR(x)	getminor(x)
+#  else
+#   if !SOLARIS
+#    define	KMALLOC(a,b)	(a) = (b)new_kmem_alloc(sizeof(*(a)), \
+							KMEM_NOSLEEP)
+#    define	KMALLOCS(a,b,c)	(a) = (b)new_kmem_alloc((c), KMEM_NOSLEEP)
+#   endif /* SOLARIS */
+#  endif /* __sgi */
+# endif /* sun && !linux */
+# ifndef	GET_MINOR
+#  define	GET_MINOR(x)	minor(x)
+# endif
+# if (BSD >= 199306) || defined(__FreeBSD__)
+#  include <vm/vm.h>
+#  if !defined(__FreeBSD__) || (defined (__FreeBSD__) && __FreeBSD__>=3)
+#   include <vm/vm_extern.h>
+#   include <sys/proc.h>
+extern	vm_map_t	kmem_map;
+#  else /* !__FreeBSD__ || (__FreeBSD__ && __FreeBSD__>=3) */
+#   include <vm/vm_kern.h>
+#  endif /* !__FreeBSD__ || (__FreeBSD__ && __FreeBSD__>=3) */
+#  ifdef	M_PFIL
+#   define	KMALLOC(a, b)	MALLOC((a), b, sizeof(*(a)), M_PFIL, M_NOWAIT)
+#   define	KMALLOCS(a, b, c)	MALLOC((a), b, (c), M_PFIL, M_NOWAIT)
+#   define	KFREE(x)	FREE((x), M_PFIL)
+#   define	KFREES(x,s)	FREE((x), M_PFIL)
+#  else
+#   define	KMALLOC(a, b)	MALLOC((a), b, sizeof(*(a)), M_TEMP, M_NOWAIT)
+#   define	KMALLOCS(a, b, c)	MALLOC((a), b, (c), M_TEMP, M_NOWAIT)
+#   define	KFREE(x)	FREE((x), M_TEMP)
+#   define	KFREES(x,s)	FREE((x), M_TEMP)
+#  endif /* M_PFIL */
+#  define	UIOMOVE(a,b,c,d)	uiomove(a,b,d)
+#  define	SLEEP(id, n)	tsleep((id), PPAUSE|PCATCH, n, 0)
+#  define	WAKEUP(id)	wakeup(id)
+# endif /* BSD */
+# if defined(NetBSD) && NetBSD <= 1991011 && NetBSD >= 199407
+#  define	SPL_NET(x)	x = splsoftnet()
+#  define	SPL_X(x)	(void) splx(x)
+# else
+#  if !SOLARIS && !defined(linux)
+#   define	SPL_IMP(x)	x = splimp()
+#   define	SPL_NET(x)	x = splnet()
+#   define	SPL_X(x)	(void) splx(x)
+#  endif
+# endif /* NetBSD && NetBSD <= 1991011 && NetBSD >= 199407 */
+# define	PANIC(x,y)	if (x) panic y
+#else /* KERNEL */
+# define	SLEEP(x,y)	;
+# define	WAKEUP(x)	;
+# define	PANIC(x,y)	;
+# define	ATOMIC_INC(x)	(x)++
+# define	ATOMIC_DEC(x)	(x)--
+# define	MUTEX_ENTER(x)	;
+# define	READ_ENTER(x)	;
+# define	WRITE_ENTER(x)	;
+# define	RW_UPGRADE(x)	;
+# define	MUTEX_DOWNGRADE(x)	;
+# define	RWLOCK_EXIT(x)	;
+# define	MUTEX_EXIT(x)	;
+# define	SPL_NET(x)	;
+# define	SPL_IMP(x)	;
+# undef		SPL_X
+# define	SPL_X(x)	;
+# define	KMALLOC(a,b)	(a) = (b)malloc(sizeof(*a))
+# define	KMALLOCS(a,b,c)	(a) = (b)malloc(c)
+# define	KFREE(x)	free(x)
+# define	KFREES(x,s)	free(x)
+# define	GETUNIT(x)	get_unit(x)
+# define	IRCOPY(a,b,c)	bcopy((a), (b), (c))
+# define	IWCOPY(a,b,c)	bcopy((a), (b), (c))
+#endif /* KERNEL */
+
+#if SOLARIS
+typedef mblk_t mb_t;
+# if SOLARIS2 >= 7
+#  ifdef lint
+#   define ALIGN32(ptr)    (ptr ? 0L : 0L)
+#   define ALIGN16(ptr)    (ptr ? 0L : 0L)
+#  else
+#   define ALIGN32(ptr)    (ptr)
+#   define ALIGN16(ptr)    (ptr)
+#  endif
+# endif
+#else
+# ifdef	linux
+#  ifndef kernel
+typedef struct mb {
+	struct mb *next;
+	u_int len;
+	u_char *data;
+} mb_t;
+#  else
+typedef struct sk_buff mb_t;
+#  endif
+# else
+typedef struct mbuf mb_t;
+# endif
+#endif /* SOLARIS */
+
+#if defined(linux) || defined(__sgi)
+/*
+ * These #ifdef's are here mainly for linux, but who knows, they may
+ * not be in other places or maybe one day linux will grow up and some
+ * of these will turn up there too.
+ */
+#ifndef	ICMP_MINLEN
+# define	ICMP_MINLEN	8
+#endif
+#ifndef	ICMP_UNREACH
+# define	ICMP_UNREACH	ICMP_DEST_UNREACH
+#endif
+#ifndef	ICMP_SOURCEQUENCH
+# define	ICMP_SOURCEQUENCH	ICMP_SOURCE_QUENCH
+#endif
+#ifndef	ICMP_TIMXCEED
+# define	ICMP_TIMXCEED	ICMP_TIME_EXCEEDED
+#endif
+#ifndef	ICMP_PARAMPROB
+# define	ICMP_PARAMPROB	ICMP_PARAMETERPROB
+#endif
+#ifndef ICMP_TSTAMP
+# define	ICMP_TSTAMP	ICMP_TIMESTAMP
+#endif
+#ifndef ICMP_TSTAMPREPLY
+# define	ICMP_TSTAMPREPLY	ICMP_TIMESTAMPREPLY
+#endif
+#ifndef ICMP_IREQ
+# define	ICMP_IREQ	ICMP_INFO_REQUEST
+#endif
+#ifndef ICMP_IREQREPLY
+# define	ICMP_IREQREPLY	ICMP_INFO_REPLY
+#endif
+#ifndef	ICMP_MASKREQ
+# define	ICMP_MASKREQ	ICMP_ADDRESS
+#endif
+#ifndef ICMP_MASKREPLY
+# define	ICMP_MASKREPLY	ICMP_ADDRESSREPLY
+#endif
+#ifndef	IPVERSION
+# define	IPVERSION	4
+#endif
+#ifndef	IPOPT_MINOFF
+# define	IPOPT_MINOFF	4
+#endif
+#ifndef	IPOPT_COPIED
+# define	IPOPT_COPIED(x)	((x)&0x80)
+#endif
+#ifndef	IPOPT_EOL
+# define	IPOPT_EOL	0
+#endif
+#ifndef	IPOPT_NOP
+# define	IPOPT_NOP	1
+#endif
+#ifndef	IP_MF
+# define	IP_MF	((u_short)0x2000)
+#endif
+#ifndef	ETHERTYPE_IP
+# define	ETHERTYPE_IP	((u_short)0x0800)
+#endif
+#ifndef	TH_FIN
+# define	TH_FIN	0x01
+#endif
+#ifndef	TH_SYN
+# define	TH_SYN	0x02
+#endif
+#ifndef	TH_RST
+# define	TH_RST	0x04
+#endif
+#ifndef	TH_PUSH
+# define	TH_PUSH	0x08
+#endif
+#ifndef	TH_ACK
+# define	TH_ACK	0x10
+#endif
+#ifndef	TH_URG
+# define	TH_URG	0x20
+#endif
+#ifndef	IPOPT_EOL
+# define	IPOPT_EOL	0
+#endif
+#ifndef	IPOPT_NOP
+# define	IPOPT_NOP	1
+#endif
+#ifndef	IPOPT_RR
+# define	IPOPT_RR	7
+#endif
+#ifndef	IPOPT_TS
+# define	IPOPT_TS	68
+#endif
+#ifndef	IPOPT_SECURITY
+# define	IPOPT_SECURITY	130
+#endif
+#ifndef	IPOPT_LSRR
+# define	IPOPT_LSRR	131
+#endif
+#ifndef	IPOPT_SATID
+# define	IPOPT_SATID	136
+#endif
+#ifndef	IPOPT_SSRR
+# define	IPOPT_SSRR	137
+#endif
+#ifndef	IPOPT_SECUR_UNCLASS
+# define	IPOPT_SECUR_UNCLASS	((u_short)0x0000)
+#endif
+#ifndef	IPOPT_SECUR_CONFID
+# define	IPOPT_SECUR_CONFID	((u_short)0xf135)
+#endif
+#ifndef	IPOPT_SECUR_EFTO
+# define	IPOPT_SECUR_EFTO	((u_short)0x789a)
+#endif
+#ifndef	IPOPT_SECUR_MMMM
+# define	IPOPT_SECUR_MMMM	((u_short)0xbc4d)
+#endif
+#ifndef	IPOPT_SECUR_RESTR
+# define	IPOPT_SECUR_RESTR	((u_short)0xaf13)
+#endif
+#ifndef	IPOPT_SECUR_SECRET
+# define	IPOPT_SECUR_SECRET	((u_short)0xd788)
+#endif
+#ifndef IPOPT_SECUR_TOPSECRET
+# define	IPOPT_SECUR_TOPSECRET	((u_short)0x6bc5)
+#endif
+#ifndef IPOPT_OLEN
+# define	IPOPT_OLEN	1
+#endif
+#endif /* linux || __sgi */
+
+#ifdef	linux
+#include <linux/in_systm.h>
+/*
+ * TCP States
+ */
+#define	TCPS_CLOSED		0	/* closed */
+#define	TCPS_LISTEN		1	/* listening for connection */
+#define	TCPS_SYN_SENT		2	/* active, have sent syn */
+#define	TCPS_SYN_RECEIVED	3	/* have send and received syn */
+/* states < TCPS_ESTABLISHED are those where connections not established */
+#define	TCPS_ESTABLISHED	4	/* established */
+#define	TCPS_CLOSE_WAIT		5	/* rcvd fin, waiting for close */
+/* states > TCPS_CLOSE_WAIT are those where user has closed */
+#define	TCPS_FIN_WAIT_1		6	/* have closed, sent fin */
+#define	TCPS_CLOSING		7	/* closed xchd FIN; await FIN ACK */
+#define	TCPS_LAST_ACK		8	/* had fin and close; await FIN ACK */
+/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
+#define	TCPS_FIN_WAIT_2		9	/* have closed, fin is acked */
+#define	TCPS_TIME_WAIT		10	/* in 2*msl quiet wait after close */
+
+/*
+ * file flags.
+ */
+#ifdef WRITE
+#define	FWRITE	WRITE
+#define	FREAD	READ
+#else
+#define	FWRITE	_IOC_WRITE
+#define	FREAD	_IOC_READ
+#endif
+/*
+ * mbuf related problems.
+ */
+#define	mtod(m,t)	(t)((m)->data)
+#define	m_len		len
+#define	m_next		next
+
+#ifdef	IP_DF
+#undef	IP_DF
+#endif
+#define	IP_DF		0x4000
+
+typedef	struct	{
+	__u16	th_sport;
+	__u16	th_dport;
+	__u32	th_seq;
+	__u32	th_ack;
+# if defined(__i386__) || defined(__MIPSEL__) || defined(__alpha__) ||\
+    defined(vax)
+	__u8	th_res:4;
+	__u8	th_off:4;
+#else
+	__u8	th_off:4;
+	__u8	th_res:4;
+#endif
+	__u8	th_flags;
+	__u16	th_win;
+	__u16	th_sum;
+	__u16	th_urp;
+} tcphdr_t;
+
+typedef	struct	{
+	__u16	uh_sport;
+	__u16	uh_dport;
+	__u16	uh_ulen;
+	__u16	uh_sum;
+} udphdr_t;
+
+typedef	struct	{
+# if defined(__i386__) || defined(__MIPSEL__) || defined(__alpha__) ||\
+    defined(vax)
+	__u8	ip_hl:4;
+	__u8	ip_v:4;
+# else
+	__u8	ip_hl:4;
+	__u8	ip_v:4;
+# endif
+	__u8	ip_tos;
+	__u16	ip_len;
+	__u16	ip_id;
+	__u16	ip_off;
+	__u8	ip_ttl;
+	__u8	ip_p;
+	__u16	ip_sum;
+	struct	in_addr	ip_src;
+	struct	in_addr	ip_dst;
+} ip_t;
+
+/*
+ * Structure of an icmp header.
+ */
+typedef struct icmp {
+	__u8	icmp_type;		/* type of message, see below */
+	__u8	icmp_code;		/* type sub code */
+	__u16	icmp_cksum;		/* ones complement cksum of struct */
+	union {
+		__u8	ih_pptr;		/* ICMP_PARAMPROB */
+		struct	in_addr	ih_gwaddr;	/* ICMP_REDIRECT */
+		struct	ih_idseq {
+			__u16	icd_id;
+			__u16	icd_seq;
+		} ih_idseq;
+		int ih_void;
+	} icmp_hun;
+# define	icmp_pptr	icmp_hun.ih_pptr
+# define	icmp_gwaddr	icmp_hun.ih_gwaddr
+# define	icmp_id		icmp_hun.ih_idseq.icd_id
+# define	icmp_seq	icmp_hun.ih_idseq.icd_seq
+# define	icmp_void	icmp_hun.ih_void
+	union {
+		struct id_ts {
+			n_time its_otime;
+			n_time its_rtime;
+			n_time its_ttime;
+		} id_ts;
+		struct id_ip  {
+			ip_t idi_ip;
+			/* options and then 64 bits of data */
+		} id_ip;
+		u_long	id_mask;
+		char	id_data[1];
+	} icmp_dun;
+# define	icmp_otime	icmp_dun.id_ts.its_otime
+# define	icmp_rtime	icmp_dun.id_ts.its_rtime
+# define	icmp_ttime	icmp_dun.id_ts.its_ttime
+# define	icmp_ip		icmp_dun.id_ip.idi_ip
+# define	icmp_mask	icmp_dun.id_mask
+# define	icmp_data	icmp_dun.id_data
+} icmphdr_t;
+
+# ifndef LINUX_IPOVLY
+#  define LINUX_IPOVLY
+struct ipovly {
+	caddr_t	ih_next, ih_prev;	/* for protocol sequence q's */
+	u_char	ih_x1;			/* (unused) */
+	u_char	ih_pr;			/* protocol */
+	short	ih_len;			/* protocol length */
+	struct	in_addr ih_src;		/* source internet address */
+	struct	in_addr ih_dst;		/* destination internet address */
+};
+# endif
+
+typedef struct  {
+	__u8	ether_dhost[6];
+	__u8	ether_shost[6];
+	__u16	ether_type;
+} ether_header_t;
+
+typedef	struct	uio	{
+	int	uio_resid;
+	int	uio_rw;
+	caddr_t	uio_buf;
+} uio_t;
+
+# define	UIO_READ	0
+# define	UIO_WRITE	1
+# define	UIOMOVE(a, b, c, d)	uiomove(a,b,c,d)
+
+/*
+ * For masking struct ifnet onto struct device
+ */
+# define	if_name	name
+
+# ifdef	KERNEL
+#  define	GETUNIT(x)	dev_get(x)
+#  define	FREE_MB_T(m)	kfree_skb(m, FREE_WRITE)
+#  define	uniqtime	do_gettimeofday
+#  undef INT_MAX
+#  undef UINT_MAX
+#  undef LONG_MAX
+#  undef ULONG_MAX
+#  include <linux/netdevice.h>
+#  define	SPL_X(x)
+#  define	SPL_NET(x)
+#  define	SPL_IMP(x)
+ 
+#  define	bcmp(a,b,c)	memcmp(a,b,c)
+#  define	bcopy(a,b,c)	memcpy(b,a,c)
+#  define	bzero(a,c)	memset(a,0,c)
+
+#  define	UNITNAME(n)	dev_get((n))
+
+#  define	KMALLOC(a,b)	(a) = (b)kmalloc(sizeof(*(a)), GFP_ATOMIC)
+#  define	KMALLOCS(a,b,c)	(a) = (b)kmalloc((c), GFP_ATOMIC)
+#  define	KFREE(x)	kfree_s((x), sizeof(*(x)))
+#  define	KFREES(x,s)	kfree_s((x), (s))
+#  define	IRCOPY(a,b,c)	{ \
+				 error = verify_area(VERIFY_READ, (a) ,(c)); \
+				 if (!error) \
+					memcpy_fromfs((b), (a), (c)); \
+				}
+#  define	IWCOPY(a,b,c)	{ \
+				 error = verify_area(VERIFY_WRITE, (b), (c)); \
+				 if (!error) \
+					memcpy_tofs((b), (a), (c)); \
+				}
+# else
+#  define	__KERNEL__
+#  undef INT_MAX
+#  undef UINT_MAX
+#  undef LONG_MAX
+#  undef ULONG_MAX
+#  define	s8 __s8
+#  define	u8 __u8
+#  define	s16 __s16
+#  define	u16 __u16
+#  define	s32 __s32
+#  define	u32 __u32
+#  include <linux/netdevice.h>
+#  undef	__KERNEL__
+# endif
+# define	ifnet	device
+#else
+typedef	struct	tcphdr	tcphdr_t;
+typedef	struct	udphdr	udphdr_t;
+typedef	struct	icmp	icmphdr_t;
+typedef	struct	ip	ip_t;
+typedef	struct	ether_header	ether_header_t;
+#endif /* linux */
+typedef	struct	tcpiphdr	tcpiphdr_t;
+
+#if defined(hpux) || defined(linux)
+struct	ether_addr	{
+	char	ether_addr_octet[6];
+};
+#endif
+
+/*
+ * XXX - This is one of those *awful* hacks which nobody likes
+ */
+#ifdef	ultrix
+#define	A_A
+#else
+#define	A_A	&
+#endif
+
+#ifndef	ICMP_ROUTERADVERT
+# define	ICMP_ROUTERADVERT	9
+#endif
+#ifndef	ICMP_ROUTERSOLICIT
+# define	ICMP_ROUTERSOLICIT	10
+#endif
+/*
+ * ICMP error replies have an IP header (20 bytes), 8 bytes of ICMP data,
+ * another IP header and then 64 bits of data, totalling 56.  Of course,
+ * the last 64 bits is dependant on that being available.
+ */
+#define	ICMPERR_ICMPHLEN	8
+#define	ICMPERR_IPICMPHLEN	(20 + 8)
+#define	ICMPERR_MINPKTLEN	(20 + 8 + 20)
+#define	ICMPERR_MAXPKTLEN	(20 + 8 + 20 + 8)
+
+#endif	/* __IP_COMPAT_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_fil.c b/sys/contrib/ipfilter/netinet/ip_fil.c
new file mode 100644
index 0000000..f4da3c3
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_fil.c
@@ -0,0 +1,1471 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)ip_fil.c	2.41 6/5/96 (C) 1993-1995 Darren Reed";
+/*static const char rcsid[] = "@(#)$Id: ip_fil.c,v 2.4.2.7 1999/10/15 13:49:43 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#ifndef	SOLARIS
+#define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(KERNEL) && !defined(_KERNEL)
+# define	_KERNEL
+#endif
+#include <sys/param.h>
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
+    defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+#endif
+#ifdef	__FreeBSD__
+# if !defined(_KERNEL) || defined(IPFILTER_LKM)
+#  include <osreldate.h>
+# endif
+#endif
+#ifndef	_KERNEL
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+# include <ctype.h>
+# include <fcntl.h>
+#endif
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#if __FreeBSD_version >= 220000 && defined(_KERNEL)
+# include <sys/fcntl.h>
+# include <sys/filio.h>
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/time.h>
+#ifdef	_KERNEL
+# include <sys/systm.h>
+#endif
+#include <sys/uio.h>
+#if !SOLARIS
+# if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000)
+#  include <sys/dirent.h>
+# else
+#  include <sys/dir.h>
+# endif
+# include <sys/mbuf.h>
+#else
+# include <sys/filio.h>
+#endif
+#include <sys/protosw.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#if __FreeBSD_version >= 300000
+# include <net/if_var.h>
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+#  include "opt_ipfilter.h"
+# endif
+#endif
+#ifdef __sgi
+#include <sys/debug.h>
+# ifdef IFF_DRVRLOCK /* IRIX6 */
+#include <sys/hashing.h>
+# endif
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#if !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /* IRIX < 6 */
+# include <netinet/in_var.h>
+#endif
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#ifndef	_KERNEL
+# include <unistd.h>
+# include <syslog.h>
+#endif
+#include "netinet/ip_compat.h"
+#include "netinet/ip_fil.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#include "netinet/ip_auth.h"
+#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+#endif
+#ifndef	MIN
+# define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+#if !SOLARIS && defined(_KERNEL) && !defined(__sgi)
+# include <sys/kernel.h>
+extern	int	ip_optcopy __P((struct ip *, struct ip *));
+#endif
+
+
+extern	struct	protosw	inetsw[];
+
+#ifndef	_KERNEL
+# include "ipt.h"
+static	struct	ifnet **ifneta = NULL;
+static	int	nifs = 0;
+#else
+# if	(BSD < 199306) || defined(__sgi)
+extern	int	tcp_ttl;
+# endif
+#endif
+
+int	ipl_inited = 0;
+int	ipl_unreach = ICMP_UNREACH_FILTER;
+u_long	ipl_frouteok[2] = {0, 0};
+
+static	void	frzerostats __P((caddr_t));
+#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
+static	int	frrequest __P((int, u_long, caddr_t, int));
+#else
+static	int	frrequest __P((int, int, caddr_t, int));
+#endif
+#ifdef	_KERNEL
+static	int	(*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **));
+static	int	send_ip __P((struct mbuf *, ip_t *));
+# ifdef	__sgi
+extern  kmutex_t        ipf_rw;
+# endif
+#else
+int	ipllog __P((void));
+void	init_ifp __P((void));
+# ifdef __sgi
+static int 	no_output __P((struct ifnet *, struct mbuf *,
+			       struct sockaddr *));
+static int	write_output __P((struct ifnet *, struct mbuf *,
+				  struct sockaddr *));
+# else
+static int 	no_output __P((struct ifnet *, struct mbuf *,
+			       struct sockaddr *, struct rtentry *));
+static int	write_output __P((struct ifnet *, struct mbuf *,
+				  struct sockaddr *, struct rtentry *));
+# endif
+#endif
+#if defined(IPFILTER_LKM)
+int	fr_running = 1;
+#else
+int	fr_running = 0;
+#endif
+
+#if (__FreeBSD_version >= 300000) && defined(_KERNEL)
+struct callout_handle ipfr_slowtimer_ch;
+#endif
+
+#if (_BSDI_VERSION >= 199510) && defined(_KERNEL)
+# include <sys/device.h>
+# include <sys/conf.h>
+
+struct cfdriver iplcd = {
+	NULL, "ipl", NULL, NULL, DV_DULL, 0
+};
+
+struct devsw iplsw = {
+	&iplcd,
+	iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
+	nostrat, nodump, nopsize, 0,
+	nostop
+};
+#endif /* _BSDI_VERSION >= 199510  && _KERNEL */
+
+#if defined(__NetBSD__) || defined(__OpenBSD__)  || (_BSDI_VERSION >= 199701)
+# include <sys/conf.h>
+# if defined(NETBSD_PF)
+#  include <net/pfil.h>
+/*
+ * We provide the fr_checkp name just to minimize changes later.
+ */
+int (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp));
+# endif /* NETBSD_PF */
+#endif /* __NetBSD__ */
+
+#ifdef	_KERNEL
+# if	defined(IPFILTER_LKM) && !defined(__sgi)
+int iplidentify(s)
+char *s;
+{
+	if (strcmp(s, "ipl") == 0)
+		return 1;
+	return 0;
+}
+# endif /* IPFILTER_LKM */
+
+
+/*
+ * Try to detect the case when compiling for NetBSD with pseudo-device
+ */
+# if defined(__NetBSD__) && defined(PFIL_HOOKS)
+void
+ipfilterattach(count)
+int count;
+{
+	if (iplattach() != 0)
+		printf("IP Filter failed to attach\n");
+}
+# endif
+
+
+int iplattach()
+{
+	char *defpass;
+	int s;
+# ifdef __sgi
+	int error;
+# endif
+
+	SPL_NET(s);
+	if (ipl_inited || (fr_checkp == fr_check)) {
+		printf("IP Filter: already initialized\n");
+		SPL_X(s);
+		return EBUSY;
+	}
+
+# ifdef	IPFILTER_LOG
+	ipflog_init();
+# endif
+	if (nat_init() == -1)
+		return -1;
+	if (fr_stateinit() == -1)
+		return -1;
+	if (appr_init() == -1)
+		return -1;
+
+# ifdef NETBSD_PF
+	pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
+# endif
+
+# ifdef __sgi
+	error = ipfilter_sgi_attach();
+	if (error) {
+		SPL_X(s);
+		return error;
+	}
+# endif
+
+	ipl_inited = 1;
+	bzero((char *)frcache, sizeof(frcache));
+	fr_savep = fr_checkp;
+	fr_checkp = fr_check;
+
+	SPL_X(s);
+	if (fr_pass & FR_PASS)
+		defpass = "pass";
+	else if (fr_pass & FR_BLOCK)
+		defpass = "block";
+	else
+		defpass = "no-match -> block";
+
+	printf("IP Filter: initialized.  Default = %s all, Logging = %s\n",
+		defpass,
+# ifdef	IPFILTER_LOG
+		"enabled");
+# else
+		"disabled");
+# endif
+	printf("%s\n", ipfilter_version);
+#ifdef	_KERNEL
+# if (__FreeBSD_version >= 300000) && defined(_KERNEL)
+	ipfr_slowtimer_ch = timeout(ipfr_slowtimer, NULL, hz/2);
+# else
+	timeout(ipfr_slowtimer, NULL, hz/2);
+# endif
+#endif
+	return 0;
+}
+
+
+/*
+ * Disable the filter by removing the hooks from the IP input/output
+ * stream.
+ */
+int ipldetach()
+{
+	int s, i = FR_INQUE|FR_OUTQUE;
+
+#ifdef	_KERNEL
+# if (__FreeBSD_version >= 300000)
+	untimeout(ipfr_slowtimer, NULL, ipfr_slowtimer_ch);
+# else
+#  ifdef __sgi
+	untimeout(ipfr_slowtimer);
+#  else
+	untimeout(ipfr_slowtimer, NULL);
+#  endif
+# endif
+#endif
+	SPL_NET(s);
+	if (!ipl_inited)
+	{
+		printf("IP Filter: not initialized\n");
+		SPL_X(s);
+		return 0;
+	}
+
+	printf("IP Filter: unloaded\n");
+
+	fr_checkp = fr_savep;
+	i = frflush(IPL_LOGIPF, i);
+	ipl_inited = 0;
+
+# ifdef NETBSD_PF
+	pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT);
+# endif
+
+# ifdef __sgi
+	ipfilter_sgi_detach();
+# endif
+
+	ipfr_unload();
+	ip_natunload();
+	fr_stateunload();
+	fr_authunload();
+
+	SPL_X(s);
+	return 0;
+}
+#endif /* _KERNEL */
+
+
+static	void	frzerostats(data)
+caddr_t	data;
+{
+	friostat_t fio;
+
+	bcopy((char *)frstats, (char *)fio.f_st,
+		sizeof(struct filterstats) * 2);
+	fio.f_fin[0] = ipfilter[0][0];
+	fio.f_fin[1] = ipfilter[0][1];
+	fio.f_fout[0] = ipfilter[1][0];
+	fio.f_fout[1] = ipfilter[1][1];
+	fio.f_acctin[0] = ipacct[0][0];
+	fio.f_acctin[1] = ipacct[0][1];
+	fio.f_acctout[0] = ipacct[1][0];
+	fio.f_acctout[1] = ipacct[1][1];
+	fio.f_active = fr_active;
+	fio.f_froute[0] = ipl_frouteok[0];
+	fio.f_froute[1] = ipl_frouteok[1];
+	IWCOPY((caddr_t)&fio, data, sizeof(fio));
+	bzero((char *)frstats, sizeof(*frstats) * 2);
+}
+
+
+/*
+ * Filter ioctl interface.
+ */
+#ifdef __sgi
+int IPL_EXTERN(ioctl)(dev_t dev, int cmd, caddr_t data, int mode
+# ifdef _KERNEL
+	, cred_t *cp, int *rp
+# endif
+)
+#else
+int IPL_EXTERN(ioctl)(dev, cmd, data, mode
+#if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
+     (__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
+, p)
+struct proc *p;
+#else
+)
+#endif
+dev_t dev;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || \
+	 (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000)
+u_long cmd;
+#else
+int cmd;
+#endif
+caddr_t data;
+int mode;
+#endif /* __sgi */
+{
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+	int error = 0, unit = 0, tmp;
+
+#if (BSD >= 199306) && defined(_KERNEL)
+	if ((securelevel >= 2) && (mode & FWRITE))
+		return EPERM;
+#endif
+#ifdef	_KERNEL
+	unit = GET_MINOR(dev);
+	if ((IPL_LOGMAX < unit) || (unit < 0))
+		return ENXIO;
+#else
+	unit = dev;
+#endif
+
+	SPL_NET(s);
+
+	if (unit == IPL_LOGNAT) {
+		error = nat_ioctl(data, cmd, mode);
+		SPL_X(s);
+		return error;
+	}
+	if (unit == IPL_LOGSTATE) {
+		error = fr_state_ioctl(data, cmd, mode);
+		SPL_X(s);
+		return error;
+	}
+	switch (cmd) {
+	case FIONREAD :
+#ifdef IPFILTER_LOG
+		IWCOPY((caddr_t)&iplused[IPL_LOGIPF], (caddr_t)data,
+		       sizeof(iplused[IPL_LOGIPF]));
+#endif
+		break;
+#if !defined(IPFILTER_LKM) && defined(_KERNEL)
+	case SIOCFRENB :
+	{
+		u_int	enable;
+
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else {
+			IRCOPY(data, (caddr_t)&enable, sizeof(enable));
+			if (enable) {
+				error = iplattach();
+				if (error == 0)
+					fr_running = 1;
+			} else {
+				error = ipldetach();
+				if (error == 0)
+					fr_running = 0;
+			}
+		}
+		break;
+	}
+#endif
+	case SIOCSETFF :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else
+			IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
+		break;
+	case SIOCGETFF :
+		IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
+		break;
+	case SIOCINAFR :
+	case SIOCRMAFR :
+	case SIOCADAFR :
+	case SIOCZRLST :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else
+			error = frrequest(unit, cmd, data, fr_active);
+		break;
+	case SIOCINIFR :
+	case SIOCRMIFR :
+	case SIOCADIFR :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else
+			error = frrequest(unit, cmd, data, 1 - fr_active);
+		break;
+	case SIOCSWAPA :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else {
+			bzero((char *)frcache, sizeof(frcache[0]) * 2);
+			*(u_int *)data = fr_active;
+			fr_active = 1 - fr_active;
+		}
+		break;
+	case SIOCGETFS :
+	{
+		struct	friostat	fio;
+
+		bcopy((char *)frstats, (char *)fio.f_st,
+			sizeof(struct filterstats) * 2);
+		fio.f_fin[0] = ipfilter[0][0];
+		fio.f_fin[1] = ipfilter[0][1];
+		fio.f_fout[0] = ipfilter[1][0];
+		fio.f_fout[1] = ipfilter[1][1];
+		fio.f_acctin[0] = ipacct[0][0];
+		fio.f_acctin[1] = ipacct[0][1];
+		fio.f_acctout[0] = ipacct[1][0];
+		fio.f_acctout[1] = ipacct[1][1];
+		fio.f_auth = ipauth;
+		fio.f_active = fr_active;
+		fio.f_froute[0] = ipl_frouteok[0];
+		fio.f_froute[1] = ipl_frouteok[1];
+		fio.f_running = fr_running;
+		fio.f_groups[0][0] = ipfgroups[0][0];
+		fio.f_groups[0][1] = ipfgroups[0][1];
+		fio.f_groups[1][0] = ipfgroups[1][0];
+		fio.f_groups[1][1] = ipfgroups[1][1];
+		fio.f_groups[2][0] = ipfgroups[2][0];
+		fio.f_groups[2][1] = ipfgroups[2][1];
+#ifdef	IPFILTER_LOG
+		fio.f_logging = 1;
+#else
+		fio.f_logging = 0;
+#endif
+		fio.f_defpass = fr_pass;
+		strncpy(fio.f_version, ipfilter_version,
+			sizeof(fio.f_version));
+		IWCOPY((caddr_t)&fio, data, sizeof(fio));
+		break;
+	}
+	case	SIOCFRZST :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else
+			frzerostats(data);
+		break;
+	case	SIOCIPFFL :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else {
+			IRCOPY(data, (caddr_t)&tmp, sizeof(tmp));
+			tmp = frflush(unit, tmp);
+			IWCOPY((caddr_t)&tmp, data, sizeof(tmp));
+		}
+		break;
+#ifdef	IPFILTER_LOG
+	case	SIOCIPFFB :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else
+			*(int *)data = ipflog_clear(unit);
+		break;
+#endif /* IPFILTER_LOG */
+	case SIOCGFRST :
+		IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
+		break;
+	case SIOCAUTHW :
+	case SIOCAUTHR :
+		if (!(mode & FWRITE)) {
+			error = EPERM;
+			break;
+		}
+	case SIOCATHST :
+		error = fr_auth_ioctl(data, cmd, NULL, NULL);
+		break;
+	case SIOCFRSYN :
+		if (!(mode & FWRITE))
+			error = EPERM;
+		else {
+#if defined(_KERNEL) && defined(__sgi)
+			ipfsync();
+#endif
+			frsync();
+		}
+		break;
+	default :
+		error = EINVAL;
+		break;
+	}
+	SPL_X(s);
+	return error;
+}
+
+
+void frsync()
+{
+#ifdef _KERNEL
+	register frentry_t *f;
+	register struct ifnet *ifp;
+
+# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
+     (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
+#  if (NetBSD >= 199905) || defined(__OpenBSD__)
+	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
+#  else
+	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
+#  endif
+# else
+	for (ifp = ifnet; ifp; ifp = ifp->if_next)
+# endif
+		ip_natsync(ifp);
+
+	WRITE_ENTER(&ipf_mutex);
+	for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == (void *)-1)
+			f->fr_ifa = GETUNIT(f->fr_ifname);
+	RWLOCK_EXIT(&ipf_mutex);
+#endif
+}
+
+
+void fr_forgetifp(ifp)
+void *ifp;
+{
+	register frentry_t *f;
+
+	WRITE_ENTER(&ipf_mutex);
+	for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next)
+		if (f->fr_ifa == ifp)
+			f->fr_ifa = (void *)-1;
+	RWLOCK_EXIT(&ipf_mutex);
+	ip_natsync(ifp);
+}
+
+
+static int frrequest(unit, req, data, set)
+int unit;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
+u_long req;
+#else
+int req;
+#endif
+int set;
+caddr_t data;
+{
+	register frentry_t *fp, *f, **fprev;
+	register frentry_t **ftail;
+	frentry_t frd;
+	frdest_t *fdp;
+	frgroup_t *fg = NULL;
+	int error = 0, in;
+	u_int group;
+
+	fp = &frd;
+	IRCOPY(data, (caddr_t)fp, sizeof(*fp));
+	fp->fr_ref = 0;
+
+	/*
+	 * Check that the group number does exist and that if a head group
+	 * has been specified, doesn't exist.
+	 */
+	if ((req != SIOCZRLST) && fp->fr_grhead &&
+	    fr_findgroup((u_int)fp->fr_grhead, fp->fr_flags, unit, set, NULL))
+		return EEXIST;
+	if ((req != SIOCZRLST) && fp->fr_group &&
+	    !fr_findgroup((u_int)fp->fr_group, fp->fr_flags, unit, set, NULL))
+		return ESRCH;
+
+	in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
+
+	if (unit == IPL_LOGAUTH)
+		ftail = fprev = &ipauth;
+	else if (fp->fr_flags & FR_ACCOUNT)
+		ftail = fprev = &ipacct[in][set];
+	else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
+		ftail = fprev = &ipfilter[in][set];
+	else
+		return ESRCH;
+
+	if ((group = fp->fr_group)) {
+		if (!(fg = fr_findgroup(group, fp->fr_flags, unit, set, NULL)))
+			return ESRCH;
+		ftail = fprev = fg->fg_start;
+	}
+
+	bzero((char *)frcache, sizeof(frcache[0]) * 2);
+
+	if (*fp->fr_ifname) {
+		fp->fr_ifa = GETUNIT(fp->fr_ifname);
+		if (!fp->fr_ifa)
+			fp->fr_ifa = (void *)-1;
+	}
+#if BSD >= 199306
+	if (*fp->fr_oifname) {
+		fp->fr_oifa = GETUNIT(fp->fr_oifname);
+		if (!fp->fr_oifa)
+			fp->fr_oifa = (void *)-1;
+	}
+#endif
+
+	fdp = &fp->fr_dif;
+	fp->fr_flags &= ~FR_DUP;
+	if (*fdp->fd_ifname) {
+		fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
+		if (!fdp->fd_ifp)
+			fdp->fd_ifp = (struct ifnet *)-1;
+		else
+			fp->fr_flags |= FR_DUP;
+	}
+
+	fdp = &fp->fr_tif;
+	if (*fdp->fd_ifname) {
+		fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
+		if (!fdp->fd_ifp)
+			fdp->fd_ifp = (struct ifnet *)-1;
+	}
+
+	/*
+	 * Look for a matching filter rule, but don't include the next or
+	 * interface pointer in the comparison (fr_next, fr_ifa).
+	 */
+	for (; (f = *ftail); ftail = &f->fr_next)
+		if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
+			 FR_CMPSIZ) == 0)
+			break;
+
+	/*
+	 * If zero'ing statistics, copy current to caller and zero.
+	 */
+	if (req == SIOCZRLST) {
+		if (!f)
+			return ESRCH;
+		IWCOPY((caddr_t)f, data, sizeof(*f));
+		f->fr_hits = 0;
+		f->fr_bytes = 0;
+		return 0;
+	}
+
+	if (!f) {
+		ftail = fprev;
+		if (req != SIOCINAFR && req != SIOCINIFR)
+			while ((f = *ftail))
+				ftail = &f->fr_next;
+		else if (fp->fr_hits)
+			while (--fp->fr_hits && (f = *ftail))
+				ftail = &f->fr_next;
+		f = NULL;
+	}
+
+	if (req == SIOCDELFR || req == SIOCRMIFR) {
+		if (!f)
+			error = ESRCH;
+		else {
+			if (f->fr_ref > 1)
+				return EBUSY;
+			if (fg && fg->fg_head)
+				fg->fg_head->fr_ref--;
+			if (unit == IPL_LOGAUTH)
+				return fr_auth_ioctl(data, req, f, ftail);
+			if (f->fr_grhead)
+				fr_delgroup((u_int)f->fr_grhead, fp->fr_flags,
+					    unit, set);
+			fixskip(fprev, f, -1);
+			*ftail = f->fr_next;
+			KFREE(f);
+		}
+	} else {
+		if (f)
+			error = EEXIST;
+		else {
+			if (unit == IPL_LOGAUTH)
+				return fr_auth_ioctl(data, req, f, ftail);
+			KMALLOC(f, frentry_t *);
+			if (f != NULL) {
+				if (fg && fg->fg_head)
+					fg->fg_head->fr_ref++;
+				bcopy((char *)fp, (char *)f, sizeof(*f));
+				f->fr_ref = 1;
+				f->fr_hits = 0;
+				f->fr_next = *ftail;
+				*ftail = f;
+				if (req == SIOCINIFR || req == SIOCINAFR)
+					fixskip(fprev, f, 1);
+				f->fr_grp = NULL;
+				if ((group = f->fr_grhead))
+					fg = fr_addgroup(group, f, unit, set);
+			} else
+				error = ENOMEM;
+		}
+	}
+	return (error);
+}
+
+
+#ifdef	_KERNEL
+/*
+ * routines below for saving IP headers to buffer
+ */
+# ifdef __sgi
+#  ifdef _KERNEL
+int IPL_EXTERN(open)(dev_t *pdev, int flags, int devtype, cred_t *cp)
+#  else
+int IPL_EXTERN(open)(dev_t dev, int flags)
+#  endif
+# else
+int IPL_EXTERN(open)(dev, flags
+#  if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
+     (__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
+, devtype, p)
+int devtype;
+struct proc *p;
+#  else
+)
+#  endif
+dev_t dev;
+int flags;
+# endif /* __sgi */
+{
+# if defined(__sgi) && defined(_KERNEL)
+	u_int min = geteminor(*pdev);
+# else
+	u_int min = GET_MINOR(dev);
+# endif
+
+	if (IPL_LOGMAX < min)
+		min = ENXIO;
+	else
+		min = 0;
+	return min;
+}
+
+
+# ifdef __sgi
+int IPL_EXTERN(close)(dev_t dev, int flags, int devtype, cred_t *cp)
+#else
+int IPL_EXTERN(close)(dev, flags
+#  if ((_BSDI_VERSION >= 199510) || (BSD >= 199506) || (NetBSD >= 199511) || \
+     (__FreeBSD_version >= 220000) || defined(__OpenBSD__)) && defined(_KERNEL)
+, devtype, p)
+int devtype;
+struct proc *p;
+#  else
+)
+#  endif
+dev_t dev;
+int flags;
+# endif /* __sgi */
+{
+	u_int	min = GET_MINOR(dev);
+
+	if (IPL_LOGMAX < min)
+		min = ENXIO;
+	else
+		min = 0;
+	return min;
+}
+
+/*
+ * iplread/ipllog
+ * both of these must operate with at least splnet() lest they be
+ * called during packet processing and cause an inconsistancy to appear in
+ * the filter lists.
+ */
+# ifdef __sgi
+int IPL_EXTERN(read)(dev_t dev, uio_t *uio, cred_t *crp)
+# else
+#  if BSD >= 199306
+int IPL_EXTERN(read)(dev, uio, ioflag)
+int ioflag;
+#  else
+int IPL_EXTERN(read)(dev, uio)
+#  endif
+dev_t dev;
+register struct uio *uio;
+# endif /* __sgi */
+{
+# ifdef IPFILTER_LOG
+	return ipflog_read(GET_MINOR(dev), uio);
+# else
+	return ENXIO;
+# endif
+}
+
+
+/*
+ * send_reset - this could conceivably be a call to tcp_respond(), but that
+ * requires a large amount of setting up and isn't any more efficient.
+ */
+int send_reset(fin, oip)
+fr_info_t *fin;
+struct ip *oip;
+{
+	struct tcphdr *tcp, *tcp2;
+	struct tcpiphdr *tp;
+	struct mbuf *m;
+	int tlen = 0;
+	ip_t *ip;
+
+	tcp = (struct tcphdr *)fin->fin_dp;
+	if (tcp->th_flags & TH_RST)
+		return -1;		/* feedback loop */
+# if	(BSD < 199306) || defined(__sgi)
+	m = m_get(M_DONTWAIT, MT_HEADER);
+# else
+	m = m_gethdr(M_DONTWAIT, MT_HEADER);
+# endif
+	if (m == NULL)
+		return ENOBUFS;
+	if (m == NULL)
+		return -1;
+
+	if (tcp->th_flags & TH_SYN)
+		tlen = 1;
+	m->m_len = sizeof(*tcp2) + sizeof(*ip);
+# if	BSD >= 199306
+	m->m_data += max_linkhdr;
+	m->m_pkthdr.len = m->m_len;
+	m->m_pkthdr.rcvif = (struct ifnet *)0;
+# endif
+	bzero(mtod(m, char *), sizeof(struct tcpiphdr));
+	ip = mtod(m, struct ip *);
+	tp = mtod(m, struct tcpiphdr *);
+	tcp2 = (struct tcphdr *)((char *)ip + sizeof(*ip));
+
+	ip->ip_src.s_addr = oip->ip_dst.s_addr;
+	ip->ip_dst.s_addr = oip->ip_src.s_addr;
+	tcp2->th_dport = tcp->th_sport;
+	tcp2->th_sport = tcp->th_dport;
+	tcp2->th_ack = ntohl(tcp->th_seq);
+	tcp2->th_ack += tlen;
+	tcp2->th_ack = htonl(tcp2->th_ack);
+	tcp2->th_off = sizeof(*tcp2) >> 2;
+	tcp2->th_flags = TH_RST|TH_ACK;
+	tp->ti_pr = oip->ip_p;
+	tp->ti_len = htons(sizeof(struct tcphdr));
+	tcp2->th_sum = in_cksum(m, sizeof(*ip) + sizeof(*tcp2));
+
+	ip->ip_tos = oip->ip_tos;
+	ip->ip_p = oip->ip_p;
+	ip->ip_len = sizeof(*ip) + sizeof(*tcp2);
+
+	return send_ip(m, ip);
+}
+
+
+static int send_ip(m, ip)
+struct mbuf *m;
+ip_t *ip;
+{
+# if (defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)) || \
+     (defined(_BSDI_VERSION) && (_BSDI_VERSION >= 199802))
+	struct route ro;
+# endif
+
+# if (BSD < 199306) || defined(__sgi)
+	ip->ip_ttl = tcp_ttl;
+# else
+	ip->ip_ttl = ip_defttl;
+# endif
+
+# if defined(__FreeBSD_version) && (__FreeBSD_version >= 220000)
+	{
+	int err;
+
+	bzero((char *)&ro, sizeof(ro));
+	err = ip_output(m, (struct mbuf *)0, &ro, 0, 0);
+	if (ro.ro_rt)
+		RTFREE(ro.ro_rt);
+	return err;
+	}
+# else
+	/*
+	 * extra 0 in case of multicast
+	 */
+#  if _BSDI_VERSION >= 199802
+	return ip_output(m, (struct mbuf *)0, &ro, 0, 0, NULL);
+#  else
+	return ip_output(m, (struct mbuf *)0, 0, 0, 0);
+#  endif
+# endif
+}
+
+
+int send_icmp_err(oip, type, code, ifp, dst)
+ip_t *oip;
+int type, code;
+void *ifp;
+struct in_addr	dst;
+{
+	struct icmp *icmp;
+	struct mbuf *m;
+	ip_t *nip;
+
+# if	(BSD < 199306) || defined(__sgi)
+	m = m_get(M_DONTWAIT, MT_HEADER);
+# else
+	m = m_gethdr(M_DONTWAIT, MT_HEADER);
+# endif
+	if (m == NULL)
+		return ENOBUFS;
+	m->m_len = sizeof(*nip) + sizeof(*icmp) + 8;
+# if	BSD >= 199306
+	m->m_data += max_linkhdr;
+	m->m_pkthdr.len = sizeof(*nip) + sizeof(*icmp) + 8;
+	m->m_pkthdr.rcvif = (struct ifnet *)0;
+# endif
+
+	bzero(mtod(m, char *), (size_t)sizeof(*nip) + sizeof(*icmp) + 8);
+	nip = mtod(m, ip_t *);
+	icmp = (struct icmp *)(nip + 1);
+
+	nip->ip_v = IPVERSION;
+	nip->ip_hl = (sizeof(*nip) >> 2);
+	nip->ip_p = IPPROTO_ICMP;
+	nip->ip_id = oip->ip_id;
+	nip->ip_sum = 0;
+	nip->ip_ttl = 60;
+	nip->ip_tos = oip->ip_tos;
+	nip->ip_len = sizeof(*nip) + sizeof(*icmp) + 8;
+	if (dst.s_addr == 0) {
+		if (fr_ifpaddr(ifp, &dst) == -1)
+			return -1;
+		dst.s_addr = htonl(dst.s_addr);
+	}
+	nip->ip_src = dst;
+	nip->ip_dst = oip->ip_src;
+
+	icmp->icmp_type = type;
+	icmp->icmp_code = code;
+	icmp->icmp_cksum = 0;
+	bcopy((char *)oip, (char *)&icmp->icmp_ip, sizeof(*oip));
+	bcopy((char *)oip + (oip->ip_hl << 2),
+	      (char *)&icmp->icmp_ip + sizeof(*oip), 8);	/* 64 bits */
+# ifndef	sparc
+	{
+	register u_short	__iplen, __ipoff;
+	ip_t *ip = &icmp->icmp_ip;
+
+	__iplen = ip->ip_len;
+	__ipoff = ip->ip_off;
+	ip->ip_len = htons(__iplen);
+	ip->ip_off = htons(__ipoff);
+	}
+# endif
+	icmp->icmp_cksum = ipf_cksum((u_short *)icmp, sizeof(*icmp) + 8);
+	return send_ip(m, nip);
+}
+
+
+# if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) && !defined(__sgi)
+#  if	(BSD < 199306)
+int iplinit __P((void));
+
+int
+#  else
+void iplinit __P((void));
+
+void
+#  endif
+iplinit()
+{
+	if (iplattach() != 0)
+		printf("IP Filter failed to attach\n");
+	ip_init();
+}
+# endif /* ! __NetBSD__ */
+
+
+size_t mbufchainlen(m0)
+register struct mbuf *m0;
+{
+	register size_t len = 0;
+
+	for (; m0; m0 = m0->m_next)
+		len += m0->m_len;
+	return len;
+}
+
+
+int ipfr_fastroute(m0, fin, fdp)
+struct mbuf *m0;
+fr_info_t *fin;
+frdest_t *fdp;
+{
+	register struct ip *ip, *mhip;
+	register struct mbuf *m = m0;
+	register struct route *ro;
+	int len, off, error = 0, hlen;
+	struct sockaddr_in *dst;
+	struct route iproute;
+	struct ifnet *ifp;
+	frentry_t *fr;
+
+	hlen = fin->fin_hlen;
+	ip = mtod(m0, struct ip *);
+	/*
+	 * Route packet.
+	 */
+	ro = &iproute;
+	bzero((caddr_t)ro, sizeof (*ro));
+	dst = (struct sockaddr_in *)&ro->ro_dst;
+	dst->sin_family = AF_INET;
+
+	fr = fin->fin_fr;
+	ifp = fdp->fd_ifp;
+	/*
+	 * In case we're here due to "to <if>" being used with "keep state",
+	 * check that we're going in the correct direction.
+	 */
+	if ((fr != NULL) && (ifp != NULL) && (fin->fin_rev != 0) &&
+	    (fdp == &fr->fr_tif))
+		return -1;
+# ifdef	__bsdi__
+	dst->sin_len = sizeof(*dst);
+# endif
+# if	(BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__) && \
+	!defined(__OpenBSD__)
+#  ifdef	RTF_CLONING
+	rtalloc_ign(ro, RTF_CLONING);
+#  else
+	rtalloc_ign(ro, RTF_PRCLONING);
+#  endif
+# else
+	rtalloc(ro);
+# endif
+	if (!ifp) {
+		if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
+			error = -2;
+			goto bad;
+		}
+		if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
+			if (in_localaddr(ip->ip_dst))
+				error = EHOSTUNREACH;
+			else
+				error = ENETUNREACH;
+			goto bad;
+		}
+		if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+			dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
+	}
+	if (ro->ro_rt)
+		ro->ro_rt->rt_use++;
+
+	/*
+	 * For input packets which are being "fastrouted", they won't
+	 * go back through output filtering and miss their chance to get
+	 * NAT'd and counted.
+	 */
+	fin->fin_ifp = ifp;
+	if (fin->fin_out == 0) {
+		fin->fin_out = 1;
+		if ((fin->fin_fr = ipacct[1][fr_active]) &&
+		    (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
+			ATOMIC_INC(frstats[1].fr_acct);
+		}
+		fin->fin_fr = NULL;
+		(void) fr_checkstate(ip, fin);
+		(void) ip_natout(ip, fin);
+	} else
+		ip->ip_sum = 0;
+	/*
+	 * If small enough for interface, can just send directly.
+	 */
+	if (ip->ip_len <= ifp->if_mtu) {
+# ifndef sparc
+		ip->ip_id = htons(ip->ip_id);
+		ip->ip_len = htons(ip->ip_len);
+		ip->ip_off = htons(ip->ip_off);
+# endif
+		if (!ip->ip_sum)
+			ip->ip_sum = in_cksum(m, hlen);
+# if	BSD >= 199306
+		error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
+					  ro->ro_rt);
+# else
+		error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
+# endif
+		goto done;
+	}
+	/*
+	 * Too large for interface; fragment if possible.
+	 * Must be able to put at least 8 bytes per fragment.
+	 */
+	if (ip->ip_off & IP_DF) {
+		error = EMSGSIZE;
+		goto bad;
+	}
+	len = (ifp->if_mtu - hlen) &~ 7;
+	if (len < 8) {
+		error = EMSGSIZE;
+		goto bad;
+	}
+
+    {
+	int mhlen, firstlen = len;
+	struct mbuf **mnext = &m->m_act;
+
+	/*
+	 * Loop through length of segment after first fragment,
+	 * make new header and copy data of each part and link onto chain.
+	 */
+	m0 = m;
+	mhlen = sizeof (struct ip);
+	for (off = hlen + len; off < ip->ip_len; off += len) {
+# ifdef	MGETHDR
+		MGETHDR(m, M_DONTWAIT, MT_HEADER);
+# else
+		MGET(m, M_DONTWAIT, MT_HEADER);
+# endif
+		if (m == 0) {
+			error = ENOBUFS;
+			goto bad;
+		}
+# if BSD >= 199306
+		m->m_data += max_linkhdr;
+# else
+		m->m_off = MMAXOFF - hlen;
+# endif
+		mhip = mtod(m, struct ip *);
+		bcopy((char *)ip, (char *)mhip, sizeof(*ip));
+		if (hlen > sizeof (struct ip)) {
+			mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
+			mhip->ip_hl = mhlen >> 2;
+		}
+		m->m_len = mhlen;
+		mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
+		if (ip->ip_off & IP_MF)
+			mhip->ip_off |= IP_MF;
+		if (off + len >= ip->ip_len)
+			len = ip->ip_len - off;
+		else
+			mhip->ip_off |= IP_MF;
+		mhip->ip_len = htons((u_short)(len + mhlen));
+		m->m_next = m_copy(m0, off, len);
+		if (m->m_next == 0) {
+			error = ENOBUFS;	/* ??? */
+			goto sendorfree;
+		}
+# ifndef sparc
+		mhip->ip_off = htons((u_short)mhip->ip_off);
+# endif
+		mhip->ip_sum = 0;
+		mhip->ip_sum = in_cksum(m, mhlen);
+		*mnext = m;
+		mnext = &m->m_act;
+	}
+	/*
+	 * Update first fragment by trimming what's been copied out
+	 * and updating header, then send each fragment (in order).
+	 */
+	m_adj(m0, hlen + firstlen - ip->ip_len);
+	ip->ip_len = htons((u_short)(hlen + firstlen));
+	ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
+	ip->ip_sum = 0;
+	ip->ip_sum = in_cksum(m0, hlen);
+sendorfree:
+	for (m = m0; m; m = m0) {
+		m0 = m->m_act;
+		m->m_act = 0;
+		if (error == 0)
+# if BSD >= 199306
+			error = (*ifp->if_output)(ifp, m,
+			    (struct sockaddr *)dst, ro->ro_rt);
+# else
+			error = (*ifp->if_output)(ifp, m,
+			    (struct sockaddr *)dst);
+# endif
+		else
+			m_freem(m);
+	}
+    }	
+done:
+	if (!error)
+		ipl_frouteok[0]++;
+	else
+		ipl_frouteok[1]++;
+
+	if (ro->ro_rt)
+		RTFREE(ro->ro_rt);
+	return 0;
+bad:
+	m_freem(m);
+	goto done;
+}
+#else /* #ifdef _KERNEL */
+
+
+# ifdef __sgi
+static int no_output __P((struct ifnet *ifp, struct mbuf *m,
+			   struct sockaddr *s))
+# else
+static int no_output __P((struct ifnet *ifp, struct mbuf *m,
+			   struct sockaddr *s, struct rtentry *rt))
+# endif
+{
+	return 0;
+}
+
+
+# ifdef __STDC__
+#  ifdef __sgi
+static int write_output __P((struct ifnet *ifp, struct mbuf *m,
+			     struct sockaddr *s))
+#  else
+static int write_output __P((struct ifnet *ifp, struct mbuf *m,
+			     struct sockaddr *s, struct rtentry *rt))
+#  endif
+{
+	ip_t *ip = (ip_t *)m;
+# else
+static int write_output(ifp, ip)
+struct ifnet *ifp;
+ip_t *ip;
+{
+# endif
+	char fname[32];
+	int fd;
+
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	snprintf(fname, sizeof(fname), "/tmp/%s", ifp->if_xname);
+# else
+	snprintf(fname, sizeof(fname), "/tmp/%s%d", ifp->if_name, ifp->if_unit);
+# endif
+	fd = open(fname, O_WRONLY|O_APPEND);
+	if (fd == -1) {
+		perror("open");
+		return -1;
+	}
+	write(fd, (char *)ip, ntohs(ip->ip_len));
+	close(fd);
+	return 0;
+}
+
+
+struct ifnet *get_unit(name)
+char *name;
+{
+	struct ifnet *ifp, **ifa;
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
+		if (!strcmp(name, ifp->if_xname))
+			return ifp;
+	}
+# else
+	char ifname[32], *s;
+
+	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
+		(void) snprintf(ifname, sizeof(ifname), "%s%d",
+				ifp->if_name, ifp->if_unit);
+		if (!strcmp(name, ifname))
+			return ifp;
+	}
+# endif
+
+	if (!ifneta) {
+		ifneta = (struct ifnet **)malloc(sizeof(ifp) * 2);
+		ifneta[1] = NULL;
+		ifneta[0] = (struct ifnet *)calloc(1, sizeof(*ifp));
+		nifs = 1;
+	} else {
+		nifs++;
+		ifneta = (struct ifnet **)realloc(ifneta,
+						  (nifs + 1) * sizeof(*ifa));
+		ifneta[nifs] = NULL;
+		ifneta[nifs - 1] = (struct ifnet *)malloc(sizeof(*ifp));
+	}
+	ifp = ifneta[nifs - 1];
+
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	strncpy(ifp->if_xname, name, sizeof(ifp->if_xname));
+# else
+	for (s = name; *s && !isdigit(*s); s++)
+		;
+	if (*s && isdigit(*s)) {
+		ifp->if_unit = atoi(s);
+		ifp->if_name = (char *)malloc(s - name + 1);
+		strncpy(ifp->if_name, name, s - name);
+		ifp->if_name[s - name] = '\0';
+	} else {
+		ifp->if_name = strdup(name);
+		ifp->if_unit = -1;
+	}
+# endif
+	ifp->if_output = no_output;
+	return ifp;
+}
+
+
+
+void init_ifp()
+{
+	struct ifnet *ifp, **ifa;
+	char fname[32];
+	int fd;
+
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199606)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
+		ifp->if_output = write_output;
+		snprintf(fname, sizeof(fname), "/tmp/%s", ifp->if_xname);
+		fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
+		if (fd == -1)
+			perror("open");
+		else
+			close(fd);
+	}
+# else
+
+	for (ifa = ifneta; ifa && (ifp = *ifa); ifa++) {
+		ifp->if_output = write_output;
+		snprintf(fname, sizeof(fname), "/tmp/%s%d", ifp->if_name, ifp->if_unit);
+		fd = open(fname, O_WRONLY|O_CREAT|O_EXCL|O_TRUNC, 0600);
+		if (fd == -1)
+			perror("open");
+		else
+			close(fd);
+	}
+# endif
+}
+
+
+int ipfr_fastroute(ip, fin, fdp)
+ip_t *ip;
+fr_info_t *fin;
+frdest_t *fdp;
+{
+	struct ifnet *ifp = fdp->fd_ifp;
+
+	if (!ifp)
+		return 0;	/* no routing table out here */
+
+	ip->ip_len = htons((u_short)ip->ip_len);
+	ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
+	ip->ip_sum = 0;
+#ifdef __sgi
+	(*ifp->if_output)(ifp, (void *)ip, NULL);
+#else
+	(*ifp->if_output)(ifp, (void *)ip, NULL, 0);
+#endif
+	return 0;
+}
+
+
+int ipllog __P((void))
+{
+	verbose("l");
+	return 0;
+}
+
+
+int send_reset(ip, ifp)
+ip_t *ip;
+struct ifnet *ifp;
+{
+	verbose("- TCP RST sent\n");
+	return 0;
+}
+
+
+int icmp_error(ip, ifp)
+ip_t *ip;
+struct ifnet *ifp;
+{
+	verbose("- TCP RST sent\n");
+	return 0;
+}
+#endif /* _KERNEL */
diff --git a/sys/contrib/ipfilter/netinet/ip_fil.h b/sys/contrib/ipfilter/netinet/ip_fil.h
new file mode 100644
index 0000000..aef96ca
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_fil.h
@@ -0,0 +1,566 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_fil.h	1.35 6/5/96
+ * $Id: ip_fil.h,v 2.3.2.4 1999/10/15 13:42:37 darrenr Exp $
+ * $FreeBSD$
+ */
+
+#ifndef	__IP_FIL_H__
+#define	__IP_FIL_H__
+
+/*
+ * Pathnames for various IP Filter control devices.  Used by LKM
+ * and userland, so defined here.
+ */
+#define	IPNAT_NAME	"/dev/ipnat"
+#define	IPSTATE_NAME	"/dev/ipstate"
+#define	IPAUTH_NAME	"/dev/ipauth"
+
+#ifndef	SOLARIS
+# define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(KERNEL) && !defined(_KERNEL)
+# define	_KERNEL
+#endif
+
+#ifndef	__P
+# ifdef	__STDC__
+#  define	__P(x)	x
+# else
+#  define	__P(x)	()
+# endif
+#endif
+
+#if defined(__STDC__) || defined(__GNUC__)
+# define	SIOCADAFR	_IOW('r', 60, struct frentry)
+# define	SIOCRMAFR	_IOW('r', 61, struct frentry)
+# define	SIOCSETFF	_IOW('r', 62, u_int)
+# define	SIOCGETFF	_IOR('r', 63, u_int)
+# define	SIOCGETFS	_IOR('r', 64, struct friostat)
+# define	SIOCIPFFL	_IOWR('r', 65, int)
+# define	SIOCIPFFB	_IOR('r', 66, int)
+# define	SIOCADIFR	_IOW('r', 67, struct frentry)
+# define	SIOCRMIFR	_IOW('r', 68, struct frentry)
+# define	SIOCSWAPA	_IOR('r', 69, u_int)
+# define	SIOCINAFR	_IOW('r', 70, struct frentry)
+# define	SIOCINIFR	_IOW('r', 71, struct frentry)
+# define	SIOCFRENB	_IOW('r', 72, u_int)
+# define	SIOCFRSYN	_IOW('r', 73, u_int)
+# define	SIOCFRZST	_IOWR('r', 74, struct friostat)
+# define	SIOCZRLST	_IOWR('r', 75, struct frentry)
+# define	SIOCAUTHW	_IOWR('r', 76, struct fr_info)
+# define	SIOCAUTHR	_IOWR('r', 77, struct fr_info)
+# define	SIOCATHST	_IOWR('r', 78, struct fr_authstat)
+#else
+# define	SIOCADAFR	_IOW(r, 60, struct frentry)
+# define	SIOCRMAFR	_IOW(r, 61, struct frentry)
+# define	SIOCSETFF	_IOW(r, 62, u_int)
+# define	SIOCGETFF	_IOR(r, 63, u_int)
+# define	SIOCGETFS	_IOR(r, 64, struct friostat)
+# define	SIOCIPFFL	_IOWR(r, 65, int)
+# define	SIOCIPFFB	_IOR(r, 66, int)
+# define	SIOCADIFR	_IOW(r, 67, struct frentry)
+# define	SIOCRMIFR	_IOW(r, 68, struct frentry)
+# define	SIOCSWAPA	_IOR(r, 69, u_int)
+# define	SIOCINAFR	_IOW(r, 70, struct frentry)
+# define	SIOCINIFR	_IOW(r, 71, struct frentry)
+# define	SIOCFRENB	_IOW(r, 72, u_int)
+# define	SIOCFRSYN	_IOW(r, 73, u_int)
+# define	SIOCFRZST	_IOWR(r, 74, struct friostat)
+# define	SIOCZRLST	_IOWR(r, 75, struct frentry)
+# define	SIOCAUTHW	_IOWR(r, 76, struct fr_info)
+# define	SIOCAUTHR	_IOWR(r, 77, struct fr_info)
+# define	SIOCATHST	_IOWR(r, 78, struct fr_authstat)
+#endif
+#define	SIOCADDFR	SIOCADAFR
+#define	SIOCDELFR	SIOCRMAFR
+#define	SIOCINSFR	SIOCINAFR
+
+typedef	struct	fr_ip	{
+	u_char	fi_v:4;		/* IP version */
+	u_char	fi_fl:4;	/* packet flags */
+	u_char	fi_tos;		/* IP packet TOS */
+	u_char	fi_ttl;		/* IP packet TTL */
+	u_char	fi_p;		/* IP packet protocol */
+	struct	in_addr	fi_src;	/* source address from packet */
+	struct	in_addr	fi_dst;	/* destination address from packet */
+	u_32_t	fi_optmsk;	/* bitmask composed from IP options */
+	u_short	fi_secmsk;	/* bitmask composed from IP security options */
+	u_short	fi_auth;	/* authentication code from IP sec. options */
+} fr_ip_t;
+
+#define	FI_OPTIONS	(FF_OPTIONS >> 24)
+#define	FI_TCPUDP	(FF_TCPUDP >> 24)	/* TCP/UCP implied comparison*/
+#define	FI_FRAG		(FF_FRAG >> 24)
+#define	FI_SHORT	(FF_SHORT >> 24)
+#define	FI_CMP		(FI_OPTIONS|FI_TCPUDP|FI_SHORT)
+
+/*
+ * These are both used by the state and NAT code to indicate that one port or
+ * the other should be treated as a wildcard.
+ */
+#define	FI_W_SPORT	0x00000100
+#define	FI_W_DPORT	0x00000200
+
+typedef	struct	fr_info	{
+	void	*fin_ifp;		/* interface packet is `on' */
+	struct	fr_ip	fin_fi;		/* IP Packet summary */
+	u_short	fin_data[2];		/* TCP/UDP ports, ICMP code/type */
+	u_char	fin_out;		/* in or out ? 1 == out, 0 == in */
+	u_char	fin_rev;		/* state only: 1 = reverse */
+	u_short	fin_hlen;		/* length of IP header in bytes */
+	u_char	fin_tcpf;		/* TCP header flags (SYN, ACK, etc) */
+	/* From here on is packet specific */
+	u_char	fin_icode;		/* ICMP error to return */
+	u_short	fin_rule;		/* rule # last matched */
+	u_short	fin_group;		/* group number, -1 for none */
+	struct	frentry *fin_fr;	/* last matching rule */
+	char	*fin_dp;		/* start of data past IP header */
+	u_short	fin_dlen;		/* length of data portion of packet */
+	u_short	fin_id;			/* IP packet id field */
+	void	*fin_mp;		/* pointer to pointer to mbuf */
+#if SOLARIS && defined(_KERNEL)
+	void	*fin_qfm;		/* pointer to mblk where pkt starts */
+	void	*fin_qif;
+#endif
+} fr_info_t;
+
+/*
+ * Size for compares on fr_info structures
+ */
+#define	FI_CSIZE	offsetof(fr_info_t, fin_icode)
+
+/*
+ * Size for copying cache fr_info structure
+ */
+#define	FI_COPYSIZE	offsetof(fr_info_t, fin_dp)
+
+typedef	struct	frdest	{
+	void	*fd_ifp;
+	struct	in_addr	fd_ip;
+	char	fd_ifname[IFNAMSIZ];
+} frdest_t;
+
+typedef	struct	frentry {
+	struct	frentry	*fr_next;
+	u_short	fr_group;	/* group to which this rule belongs */
+	u_short	fr_grhead;	/* group # which this rule starts */
+	struct	frentry	*fr_grp;
+	int	fr_ref;		/* reference count - for grouping */
+	void	*fr_ifa;
+#if BSD >= 199306
+	void	*fr_oifa;
+#endif
+	/*
+	 * These are only incremented when a packet  matches this rule and
+	 * it is the last match
+	 */
+	U_QUAD_T	fr_hits;
+	U_QUAD_T	fr_bytes;
+	/*
+	 * Fields after this may not change whilst in the kernel.
+	 */
+	struct	fr_ip	fr_ip;
+	struct	fr_ip	fr_mip;	/* mask structure */
+
+	u_char	fr_tcpfm;	/* tcp flags mask */
+	u_char	fr_tcpf;	/* tcp flags */
+
+	u_short	fr_icmpm;	/* data for ICMP packets (mask) */
+	u_short	fr_icmp;
+
+	u_char	fr_scmp;	/* data for port comparisons */
+	u_char	fr_dcmp;
+	u_short	fr_dport;
+	u_short	fr_sport;
+	u_short	fr_stop;	/* top port for <> and >< */
+	u_short	fr_dtop;	/* top port for <> and >< */
+	u_32_t	fr_flags;	/* per-rule flags && options (see below) */
+	u_short	fr_skip;	/* # of rules to skip */
+	u_short	fr_loglevel;	/* syslog log facility + priority */
+	int	(*fr_func) __P((int, ip_t *, fr_info_t *));	/* call this function */
+	char	fr_icode;	/* return ICMP code */
+	char	fr_ifname[IFNAMSIZ];
+#if BSD >= 199306
+	char	fr_oifname[IFNAMSIZ];
+#endif
+	struct	frdest	fr_tif;	/* "to" interface */
+	struct	frdest	fr_dif;	/* duplicate packet interfaces */
+} frentry_t;
+
+#define	fr_proto	fr_ip.fi_p
+#define	fr_ttl		fr_ip.fi_ttl
+#define	fr_tos		fr_ip.fi_tos
+#define	fr_dst		fr_ip.fi_dst
+#define	fr_src		fr_ip.fi_src
+#define	fr_dmsk		fr_mip.fi_dst
+#define	fr_smsk		fr_mip.fi_src
+
+#ifndef	offsetof
+#define	offsetof(t,m)	(int)((&((t *)0L)->m))
+#endif
+#define	FR_CMPSIZ	(sizeof(struct frentry) - offsetof(frentry_t, fr_ip))
+
+/*
+ * fr_flags
+ */
+#define	FR_BLOCK	0x00001	/* do not allow packet to pass */
+#define	FR_PASS		0x00002	/* allow packet to pass */
+#define	FR_OUTQUE	0x00004	/* outgoing packets */
+#define	FR_INQUE	0x00008	/* ingoing packets */
+#define	FR_LOG		0x00010	/* Log */
+#define	FR_LOGB		0x00011	/* Log-fail */
+#define	FR_LOGP		0x00012	/* Log-pass */
+#define	FR_LOGBODY	0x00020	/* Log the body */
+#define	FR_LOGFIRST	0x00040	/* Log the first byte if state held */
+#define	FR_RETRST	0x00080	/* Return TCP RST packet - reset connection */
+#define	FR_RETICMP	0x00100	/* Return ICMP unreachable packet */
+#define	FR_FAKEICMP	0x00180	/* Return ICMP unreachable with fake source */
+#define	FR_NOMATCH	0x00200	/* no match occured */
+#define	FR_ACCOUNT	0x00400	/* count packet bytes */
+#define	FR_KEEPFRAG	0x00800	/* keep fragment information */
+#define	FR_KEEPSTATE	0x01000	/* keep `connection' state information */
+#define	FR_INACTIVE	0x02000
+#define	FR_QUICK	0x04000	/* match & stop processing list */
+#define	FR_FASTROUTE	0x08000	/* bypass normal routing */
+#define	FR_CALLNOW	0x10000	/* call another function (fr_func) if matches */
+#define	FR_DUP		0x20000	/* duplicate packet */
+#define	FR_LOGORBLOCK	0x40000	/* block the packet if it can't be logged */
+#define	FR_NOTSRCIP	0x80000	/* not the src IP# */
+#define	FR_NOTDSTIP	0x100000	/* not the dst IP# */
+#define	FR_AUTH		0x200000	/* use authentication */
+#define	FR_PREAUTH	0x400000	/* require preauthentication */
+#define	FR_DONTCACHE	0x800000	/* don't cache the result */
+
+#define	FR_LOGMASK	(FR_LOG|FR_LOGP|FR_LOGB)
+#define	FR_RETMASK	(FR_RETICMP|FR_RETRST|FR_FAKEICMP)
+
+/*
+ * These correspond to #define's for FI_* and are stored in fr_flags
+ */
+#define	FF_OPTIONS	0x01000000
+#define	FF_TCPUDP	0x02000000
+#define	FF_FRAG		0x04000000
+#define	FF_SHORT	0x08000000
+/*
+ * recognized flags for SIOCGETFF and SIOCSETFF, and get put in fr_flags
+ */
+#define	FF_LOGPASS	0x10000000
+#define	FF_LOGBLOCK	0x20000000
+#define	FF_LOGNOMATCH	0x40000000
+#define	FF_LOGGING	(FF_LOGPASS|FF_LOGBLOCK|FF_LOGNOMATCH)
+#define	FF_BLOCKNONIP	0x80000000	/* Solaris2 Only */
+
+#define	FR_NONE 0
+#define	FR_EQUAL 1
+#define	FR_NEQUAL 2
+#define FR_LESST 3
+#define FR_GREATERT 4
+#define FR_LESSTE 5
+#define FR_GREATERTE 6
+#define	FR_OUTRANGE 7
+#define	FR_INRANGE 8
+
+typedef	struct	filterstats {
+	u_long	fr_pass;	/* packets allowed */
+	u_long	fr_block;	/* packets denied */
+	u_long	fr_nom;		/* packets which don't match any rule */
+	u_long	fr_ppkl;	/* packets allowed and logged */
+	u_long	fr_bpkl;	/* packets denied and logged */
+	u_long	fr_npkl;	/* packets unmatched and logged */
+	u_long	fr_pkl;		/* packets logged */
+	u_long	fr_skip;	/* packets to be logged but buffer full */
+	u_long	fr_ret;		/* packets for which a return is sent */
+	u_long	fr_acct;	/* packets for which counting was performed */
+	u_long	fr_bnfr;	/* bad attempts to allocate fragment state */
+	u_long	fr_nfr;		/* new fragment state kept */
+	u_long	fr_cfr;		/* add new fragment state but complete pkt */
+	u_long	fr_bads;	/* bad attempts to allocate packet state */
+	u_long	fr_ads;		/* new packet state kept */
+	u_long	fr_chit;	/* cached hit */
+	u_long	fr_tcpbad;	/* TCP checksum check failures */
+	u_long	fr_pull[2];	/* good and bad pullup attempts */
+#if SOLARIS
+	u_long	fr_notdata;	/* PROTO/PCPROTO that have no data */
+	u_long	fr_nodata;	/* mblks that have no data */
+	u_long	fr_bad;		/* bad IP packets to the filter */
+	u_long	fr_notip;	/* packets passed through no on ip queue */
+	u_long	fr_drop;	/* packets dropped - no info for them! */
+#endif
+} filterstats_t;
+
+/*
+ * For SIOCGETFS
+ */
+typedef	struct	friostat	{
+	struct	filterstats	f_st[2];
+	struct	frentry		*f_fin[2];
+	struct	frentry		*f_fout[2];
+	struct	frentry		*f_acctin[2];
+	struct	frentry		*f_acctout[2];
+	struct	frentry		*f_auth;
+	struct	frgroup		*f_groups[3][2];
+	u_long	f_froute[2];
+	int	f_active;	/* 1 or 0 - active rule set */
+	int	f_defpass;	/* default pass - from fr_pass */
+	int	f_running;	/* 1 if running, else 0 */
+	int	f_logging;	/* 1 if enabled, else 0 */
+	char	f_version[32];	/* version string */
+} friostat_t;
+
+typedef struct	optlist {
+	u_short ol_val;
+	int	ol_bit;
+} optlist_t;
+
+
+/*
+ * Group list structure.
+ */
+typedef	struct frgroup {
+	u_short	fg_num;
+	struct	frgroup	*fg_next;
+	struct	frentry	*fg_head;
+	struct	frentry	**fg_start;
+} frgroup_t;
+
+
+/*
+ * Log structure.  Each packet header logged is prepended by one of these.
+ * Following this in the log records read from the device will be an ipflog
+ * structure which is then followed by any packet data.
+ */
+typedef	struct	iplog	{
+	u_32_t	ipl_magic;
+	u_int	ipl_count;
+	u_long	ipl_sec;
+	u_long	ipl_usec;
+	size_t	ipl_dsize;
+	struct	iplog	*ipl_next;
+} iplog_t;
+
+#define IPL_MAGIC 0x49504c4d /* 'IPLM' */
+
+typedef	struct	ipflog	{
+#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
+        (defined(OpenBSD) && (OpenBSD >= 199603))
+	u_char	fl_ifname[IFNAMSIZ];
+#else
+	u_int	fl_unit;
+	u_char	fl_ifname[4];
+#endif
+	u_char	fl_plen;	/* extra data after hlen */
+	u_char	fl_hlen;	/* length of IP headers saved */
+	u_short	fl_rule;	/* assume never more than 64k rules, total */
+	u_short	fl_group;
+	u_short	fl_loglevel;	/* syslog log level */
+	u_32_t	fl_flags;
+	u_32_t	fl_lflags;
+} ipflog_t;
+
+
+#ifndef	ICMP_UNREACH_FILTER
+# define	ICMP_UNREACH_FILTER	13
+#endif
+
+#ifndef	IPF_LOGGING
+# define	IPF_LOGGING	0
+#endif
+#ifndef	IPF_DEFAULT_PASS
+# define	IPF_DEFAULT_PASS	FR_PASS
+#endif
+
+#define	IPMINLEN(i, h)	((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
+#define	IPLLOGSIZE	8192
+
+/*
+ * Device filenames for reading log information.  Use ipf on Solaris2 because
+ * ipl is already a name used by something else.
+ */
+#ifndef	IPL_NAME
+# if	SOLARIS
+#  define	IPL_NAME	"/dev/ipf"
+# else
+#  define	IPL_NAME	"/dev/ipl"
+# endif
+#endif
+#define	IPL_NAT		IPNAT_NAME
+#define	IPL_STATE	IPSTATE_NAME
+#define	IPL_AUTH	IPAUTH_NAME
+
+#define	IPL_LOGIPF	0	/* Minor device #'s for accessing logs */
+#define	IPL_LOGNAT	1
+#define	IPL_LOGSTATE	2
+#define	IPL_LOGAUTH	3
+#define	IPL_LOGMAX	3
+
+#if !defined(CDEV_MAJOR) && defined (__FreeBSD_version) && \
+    (__FreeBSD_version >= 220000)
+# define	CDEV_MAJOR	79
+#endif
+
+/*
+ * Post NetBSD 1.2 has the PFIL interface for packet filters.  This turns
+ * on those hooks.  We don't need any special mods in non-IP Filter code
+ * with this!
+ */
+#if (defined(NetBSD) && (NetBSD > 199609) && (NetBSD <= 1991011)) || \
+    (defined(NetBSD1_2) && NetBSD1_2 > 1)
+# if (NetBSD >= 199905)
+#  define PFIL_HOOKS
+# endif
+# ifdef PFIL_HOOKS
+#  define NETBSD_PF
+# endif
+#endif
+
+
+#ifndef	_KERNEL
+extern	int	fr_check __P((ip_t *, int, void *, int, mb_t **));
+extern	int	(*fr_checkp) __P((ip_t *, int, void *, int, mb_t **));
+extern	int	send_reset __P((ip_t *, struct ifnet *));
+extern	int	icmp_error __P((ip_t *, struct ifnet *));
+extern	int	ipf_log __P((void));
+extern	int	ipfr_fastroute __P((ip_t *, fr_info_t *, frdest_t *));
+extern	struct	ifnet *get_unit __P((char *));
+# if defined(__NetBSD__) || defined(__OpenBSD__) || \
+	  (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000)
+extern	int	iplioctl __P((dev_t, u_long, caddr_t, int));
+# else
+extern	int	iplioctl __P((dev_t, int, caddr_t, int));
+# endif
+extern	int	iplopen __P((dev_t, int));
+extern	int	iplclose __P((dev_t, int));
+#else /* #ifndef _KERNEL */
+# if defined(__NetBSD__) && defined(PFIL_HOOKS)
+extern	void	ipfilterattach __P((int));
+# endif
+extern	int	iplattach __P((void));
+extern	int	ipl_enable __P((void));
+extern	int	ipl_disable __P((void));
+extern	void	ipflog_init __P((void));
+extern	int	ipflog_clear __P((minor_t));
+extern	int	ipflog_read __P((minor_t, struct uio *));
+extern	int	ipflog __P((u_int, ip_t *, fr_info_t *, mb_t *));
+extern	int	ipllog __P((int, fr_info_t *, void **, size_t *, int *, int));
+# if	SOLARIS
+extern	int	fr_check __P((ip_t *, int, void *, int, qif_t *, mb_t **));
+extern	int	(*fr_checkp) __P((ip_t *, int, void *,
+				  int, qif_t *, mb_t **));
+extern	int	icmp_error __P((ip_t *, int, int, qif_t *, struct in_addr));
+#  if SOLARIS2 >= 7
+extern	int	iplioctl __P((dev_t, int, intptr_t, int, cred_t *, int *));
+#  else
+extern	int	iplioctl __P((dev_t, int, int *, int, cred_t *, int *));
+#  endif
+extern	int	iplopen __P((dev_t *, int, int, cred_t *));
+extern	int	iplclose __P((dev_t, int, int, cred_t *));
+extern	int	ipfsync __P((void));
+extern	int	send_reset __P((fr_info_t *, ip_t *, qif_t *));
+extern	int	ipfr_fastroute __P((qif_t *, ip_t *, mblk_t *, mblk_t **,
+				   fr_info_t *, frdest_t *));
+extern	void	copyin_mblk __P((mblk_t *, size_t, size_t, char *));
+extern	void	copyout_mblk __P((mblk_t *, size_t, size_t, char *));
+extern	int	fr_qin __P((queue_t *, mblk_t *));
+extern	int	fr_qout __P((queue_t *, mblk_t *));
+#  ifdef	IPFILTER_LOG
+extern	int	iplread __P((dev_t, struct uio *, cred_t *));
+#  endif
+# else /* SOLARIS */
+extern	int	fr_check __P((ip_t *, int, void *, int, mb_t **));
+extern	int	(*fr_checkp) __P((ip_t *, int, void *, int, mb_t **));
+#  ifdef	linux
+extern	int	send_reset __P((tcpiphdr_t *, struct ifnet *));
+#  else
+extern	int	send_reset __P((fr_info_t *, struct ip *));
+extern	int	send_icmp_err __P((ip_t *, int, int, void *, struct in_addr));
+#  endif
+extern	int	ipfr_fastroute __P((mb_t *, fr_info_t *, frdest_t *));
+extern	size_t	mbufchainlen __P((mb_t *));
+#  ifdef	__sgi
+#   include <sys/cred.h>
+extern	int	iplioctl __P((dev_t, int, caddr_t, int, cred_t *, int *));
+extern	int	iplopen __P((dev_t *, int, int, cred_t *));
+extern	int	iplclose __P((dev_t, int, int, cred_t *));
+extern	int	iplread __P((dev_t, struct uio *, cred_t *));
+extern	int	ipfsync __P((void));
+extern	int	ipfilter_sgi_attach __P((void));
+extern	void	ipfilter_sgi_detach __P((void));
+extern	void	ipfilter_sgi_intfsync __P((void));
+#  else
+#   ifdef	IPFILTER_LKM
+extern	int	iplidentify __P((char *));
+#   endif
+#   if (_BSDI_VERSION >= 199510) || (__FreeBSD_version >= 220000) || \
+      (NetBSD >= 199511) || defined(__OpenBSD__)
+#    if defined(__NetBSD__) || (_BSDI_VERSION >= 199701) || \
+       defined(__OpenBSD__) || (__FreeBSD_version >= 300000)
+extern	int	iplioctl __P((dev_t, u_long, caddr_t, int, struct proc *));
+#    else
+extern	int	iplioctl __P((dev_t, int, caddr_t, int, struct proc *));
+#    endif
+extern	int	iplopen __P((dev_t, int, int, struct proc *));
+extern	int	iplclose __P((dev_t, int, int, struct proc *));
+#   else
+#    ifndef	linux
+extern	int	iplopen __P((dev_t, int));
+extern	int	iplclose __P((dev_t, int));
+extern	int	iplioctl __P((dev_t, int, caddr_t, int));
+#    else
+extern	int	iplioctl(struct inode *, struct file *, u_int, u_long);
+extern	int	iplopen __P((struct inode *, struct file *));
+extern	void	iplclose __P((struct inode *, struct file *));
+#    endif /* !linux */
+#   endif /* (_BSDI_VERSION >= 199510) */
+#   if	BSD >= 199306
+extern	int	iplread __P((dev_t, struct uio *, int));
+#   else
+#    ifndef linux
+extern	int	iplread __P((dev_t, struct uio *));
+#    else
+extern	int	iplread(struct inode *, struct file *, char *, int);
+#    endif /* !linux */
+#   endif /* BSD >= 199306 */
+#  endif /* __ sgi */
+# endif /* SOLARIS */
+#endif /* #ifndef _KERNEL */
+
+extern	void	fixskip __P((frentry_t **, frentry_t *, int));
+extern	int	countbits __P((u_32_t));
+extern	int	ipldetach __P((void));
+extern	u_short	fr_tcpsum __P((mb_t *, ip_t *, tcphdr_t *));
+extern	int	fr_scanlist __P((u_32_t, ip_t *, fr_info_t *, void *));
+extern	u_short	ipf_cksum __P((u_short *, int));
+extern	int	fr_copytolog __P((int, char *, int));
+extern	void	fr_forgetifp __P((void *));
+extern	int	frflush __P((minor_t, int));
+extern	void	frsync __P((void));
+extern	frgroup_t *fr_addgroup __P((u_int, frentry_t *, minor_t, int));
+extern	frgroup_t *fr_findgroup __P((u_int, u_32_t, minor_t, int, frgroup_t ***));
+extern	void	fr_delgroup __P((u_int, u_32_t, minor_t, int));
+extern  void	fr_makefrip __P((int, ip_t *, fr_info_t *));
+extern	int	fr_ifpaddr __P((void *, struct in_addr *));
+extern	char	*memstr __P((char *, char *, int, int));
+extern	int	ipl_unreach;
+extern	int	ipl_inited;
+extern	u_long	ipl_frouteok[2];
+extern	int	fr_pass;
+extern	int	fr_flags;
+extern	int	fr_active;
+extern	fr_info_t	frcache[2];
+extern	char	ipfilter_version[];
+#ifdef	IPFILTER_LOG
+extern	iplog_t	**iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1];
+extern	size_t	iplused[IPL_LOGMAX + 1];
+#endif
+extern	struct frentry *ipfilter[2][2], *ipacct[2][2];
+extern	struct frgroup *ipfgroups[3][2];
+extern	struct filterstats frstats[];
+
+#endif	/* __IP_FIL_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_frag.c b/sys/contrib/ipfilter/netinet/ip_frag.c
new file mode 100644
index 0000000..af07c3d
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_frag.c
@@ -0,0 +1,525 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)ip_frag.c	1.11 3/24/96 (C) 1993-1995 Darren Reed";
+/*static const char rcsid[] = "@(#)$Id: ip_frag.c,v 2.4.2.3 1999/09/18 15:03:54 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#if defined(KERNEL) && !defined(_KERNEL)
+# define      _KERNEL
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+#endif
+#if defined(KERNEL) && (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/uio.h>
+#ifndef linux
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(_KERNEL) && !defined(linux)
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# if defined(_KERNEL) && !defined(__sgi)
+#  include <sys/kernel.h>
+# endif
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+#  include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#ifndef linux
+# include <netinet/ip_var.h>
+#endif
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#include "netinet/ip_auth.h"
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+# if (defined(KERNEL) || defined(_KERNEL))
+#  ifndef IPFILTER_LKM
+#   include <sys/libkern.h>
+#   include <sys/systm.h>
+# endif
+extern struct callout_handle ipfr_slowtimer_ch;
+# endif
+#endif
+
+
+static ipfr_t	*ipfr_heads[IPFT_SIZE];
+static ipfr_t	*ipfr_nattab[IPFT_SIZE];
+static ipfrstat_t ipfr_stats;
+static int	ipfr_inuse = 0;
+
+int		fr_ipfrttl = 120;	/* 60 seconds */
+
+#ifdef _KERNEL
+# if SOLARIS2 >= 7
+extern	timeout_id_t	ipfr_timer_id;
+# else
+extern	int	ipfr_timer_id;
+# endif
+#endif
+#if	(SOLARIS || defined(__sgi)) && defined(_KERNEL)
+extern	KRWLOCK_T	ipf_frag, ipf_natfrag, ipf_nat, ipf_mutex;
+# if	SOLARIS
+extern	KRWLOCK_T	ipf_solaris;
+# else
+KRWLOCK_T	ipf_solaris;
+# endif
+extern	kmutex_t	ipf_rw;
+#endif
+
+
+static ipfr_t *ipfr_new __P((ip_t *, fr_info_t *, u_int, ipfr_t **));
+static ipfr_t *ipfr_lookup __P((ip_t *, fr_info_t *, ipfr_t **));
+static void ipfr_delete __P((ipfr_t *));
+
+
+ipfrstat_t *ipfr_fragstats()
+{
+	ipfr_stats.ifs_table = ipfr_heads;
+	ipfr_stats.ifs_nattab = ipfr_nattab;
+	ipfr_stats.ifs_inuse = ipfr_inuse;
+	return &ipfr_stats;
+}
+
+
+/*
+ * add a new entry to the fragment cache, registering it as having come
+ * through this box, with the result of the filter operation.
+ */
+static ipfr_t *ipfr_new(ip, fin, pass, table)
+ip_t *ip;
+fr_info_t *fin;
+u_int pass;
+ipfr_t *table[];
+{
+	ipfr_t	**fp, *fra, frag;
+	u_int	idx;
+
+	frag.ipfr_p = ip->ip_p;
+	idx = ip->ip_p;
+	frag.ipfr_id = ip->ip_id;
+	idx += ip->ip_id;
+	frag.ipfr_tos = ip->ip_tos;
+	frag.ipfr_src.s_addr = ip->ip_src.s_addr;
+	idx += ip->ip_src.s_addr;
+	frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
+	idx += ip->ip_dst.s_addr;
+	idx *= 127;
+	idx %= IPFT_SIZE;
+
+	/*
+	 * first, make sure it isn't already there...
+	 */
+	for (fp = &table[idx]; (fra = *fp); fp = &fra->ipfr_next)
+		if (!bcmp((char *)&frag.ipfr_src, (char *)&fra->ipfr_src,
+			  IPFR_CMPSZ)) {
+			ATOMIC_INC(ipfr_stats.ifs_exists);
+			return NULL;
+		}
+
+	/*
+	 * allocate some memory, if possible, if not, just record that we
+	 * failed to do so.
+	 */
+	KMALLOC(fra, ipfr_t *);
+	if (fra == NULL) {
+		ATOMIC_INC(ipfr_stats.ifs_nomem);
+		return NULL;
+	}
+
+	if ((fra->ipfr_rule = fin->fin_fr) != NULL) {
+		ATOMIC_INC(fin->fin_fr->fr_ref);
+	}
+
+
+	/*
+	 * Instert the fragment into the fragment table, copy the struct used
+	 * in the search using bcopy rather than reassign each field.
+	 * Set the ttl to the default and mask out logging from "pass"
+	 */
+	if ((fra->ipfr_next = table[idx]))
+		table[idx]->ipfr_prev = fra;
+	fra->ipfr_prev = NULL;
+	fra->ipfr_data = NULL;
+	table[idx] = fra;
+	bcopy((char *)&frag.ipfr_src, (char *)&fra->ipfr_src, IPFR_CMPSZ);
+	fra->ipfr_ttl = fr_ipfrttl;
+	/*
+	 * Compute the offset of the expected start of the next packet.
+	 */
+	fra->ipfr_off = (ip->ip_off & IP_OFFMASK) + (fin->fin_dlen >> 3);
+	ATOMIC_INC(ipfr_stats.ifs_new);
+	ATOMIC_INC(ipfr_inuse);
+	return fra;
+}
+
+
+int ipfr_newfrag(ip, fin, pass)
+ip_t *ip;
+fr_info_t *fin;
+u_int pass;
+{
+	ipfr_t	*ipf;
+
+	WRITE_ENTER(&ipf_frag);
+	ipf = ipfr_new(ip, fin, pass, ipfr_heads);
+	RWLOCK_EXIT(&ipf_frag);
+	return ipf ? 0 : -1;
+}
+
+
+int ipfr_nat_newfrag(ip, fin, pass, nat)
+ip_t *ip;
+fr_info_t *fin;
+u_int pass;
+nat_t *nat;
+{
+	ipfr_t	*ipf;
+
+	WRITE_ENTER(&ipf_natfrag);
+	ipf = ipfr_new(ip, fin, pass, ipfr_nattab);
+	if (ipf != NULL) {
+		ipf->ipfr_data = nat;
+		nat->nat_data = ipf;
+	}
+	RWLOCK_EXIT(&ipf_natfrag);
+	return ipf ? 0 : -1;
+}
+
+
+/*
+ * check the fragment cache to see if there is already a record of this packet
+ * with its filter result known.
+ */
+static ipfr_t *ipfr_lookup(ip, fin, table)
+ip_t *ip;
+fr_info_t *fin;
+ipfr_t *table[];
+{
+	ipfr_t	*f, frag;
+	u_int	idx;
+
+	/*
+	 * For fragments, we record protocol, packet id, TOS and both IP#'s
+	 * (these should all be the same for all fragments of a packet).
+	 *
+	 * build up a hash value to index the table with.
+	 */
+	frag.ipfr_p = ip->ip_p;
+	idx = ip->ip_p;
+	frag.ipfr_id = ip->ip_id;
+	idx += ip->ip_id;
+	frag.ipfr_tos = ip->ip_tos;
+	frag.ipfr_src.s_addr = ip->ip_src.s_addr;
+	idx += ip->ip_src.s_addr;
+	frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
+	idx += ip->ip_dst.s_addr;
+	idx *= 127;
+	idx %= IPFT_SIZE;
+
+	/*
+	 * check the table, careful to only compare the right amount of data
+	 */
+	for (f = table[idx]; f; f = f->ipfr_next)
+		if (!bcmp((char *)&frag.ipfr_src, (char *)&f->ipfr_src,
+			  IPFR_CMPSZ)) {
+			u_short	atoff, off;
+
+			if (f != table[idx]) {
+				/*
+				 * move fragment info. to the top of the list
+				 * to speed up searches.
+				 */
+				if ((f->ipfr_prev->ipfr_next = f->ipfr_next))
+					f->ipfr_next->ipfr_prev = f->ipfr_prev;
+				f->ipfr_next = table[idx];
+				table[idx]->ipfr_prev = f;
+				f->ipfr_prev = NULL;
+				table[idx] = f;
+			}
+			off = ip->ip_off;
+			atoff = off + (fin->fin_dlen >> 3);
+			/*
+			 * If we've follwed the fragments, and this is the
+			 * last (in order), shrink expiration time.
+			 */
+			if ((off & IP_OFFMASK) == f->ipfr_off) {
+				if (!(off & IP_MF))
+					f->ipfr_ttl = 1;
+				else
+					f->ipfr_off = atoff;
+			}
+			ATOMIC_INC(ipfr_stats.ifs_hits);
+			return f;
+		}
+	return NULL;
+}
+
+
+/*
+ * functional interface for NAT lookups of the NAT fragment cache
+ */
+nat_t *ipfr_nat_knownfrag(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	nat_t	*nat;
+	ipfr_t	*ipf;
+
+	READ_ENTER(&ipf_natfrag);
+	ipf = ipfr_lookup(ip, fin, ipfr_nattab);
+	if (ipf != NULL) {
+		nat = ipf->ipfr_data;
+		/*
+		 * This is the last fragment for this packet.
+		 */
+		if ((ipf->ipfr_ttl == 1) && (nat != NULL)) {
+			nat->nat_data = NULL;
+			ipf->ipfr_data = NULL;
+		}
+	} else
+		nat = NULL;
+	RWLOCK_EXIT(&ipf_natfrag);
+	return nat;
+}
+
+
+/*
+ * functional interface for normal lookups of the fragment cache
+ */
+frentry_t *ipfr_knownfrag(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	frentry_t *fr = NULL;
+	ipfr_t	*fra;
+
+	READ_ENTER(&ipf_frag);
+	fra = ipfr_lookup(ip, fin, ipfr_heads);
+	if (fra != NULL)
+		fr = fra->ipfr_rule;
+	RWLOCK_EXIT(&ipf_frag);
+	return fr;
+}
+
+
+/*
+ * forget any references to this external object.
+ */
+void ipfr_forget(nat)
+void *nat;
+{
+	ipfr_t	*fr;
+	int	idx;
+
+	WRITE_ENTER(&ipf_natfrag);
+	for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+		for (fr = ipfr_heads[idx]; fr; fr = fr->ipfr_next)
+			if (fr->ipfr_data == nat)
+				fr->ipfr_data = NULL;
+
+	RWLOCK_EXIT(&ipf_natfrag);
+}
+
+
+static void ipfr_delete(fra)
+ipfr_t *fra;
+{
+	frentry_t *fr;
+
+	fr = fra->ipfr_rule;
+	if (fr != NULL) {
+		ATOMIC_DEC(fr->fr_ref);
+		if (fr->fr_ref == 0)
+			KFREE(fr);
+	}
+	if (fra->ipfr_prev)
+		fra->ipfr_prev->ipfr_next = fra->ipfr_next;
+	if (fra->ipfr_next)
+		fra->ipfr_next->ipfr_prev = fra->ipfr_prev;
+	KFREE(fra);
+}
+
+
+/*
+ * Free memory in use by fragment state info. kept.
+ */
+void ipfr_unload()
+{
+	ipfr_t	**fp, *fra;
+	nat_t	*nat;
+	int	idx;
+
+	WRITE_ENTER(&ipf_frag);
+	for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+		for (fp = &ipfr_heads[idx]; (fra = *fp); ) {
+			*fp = fra->ipfr_next;
+			ipfr_delete(fra);
+		}
+	RWLOCK_EXIT(&ipf_frag);
+
+	WRITE_ENTER(&ipf_nat);
+	WRITE_ENTER(&ipf_natfrag);
+	for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+		for (fp = &ipfr_nattab[idx]; (fra = *fp); ) {
+			*fp = fra->ipfr_next;
+			nat = fra->ipfr_data;
+			if (nat != NULL) {
+				if (nat->nat_data == fra)
+					nat->nat_data = NULL;
+			}
+			ipfr_delete(fra);
+		}
+	RWLOCK_EXIT(&ipf_natfrag);
+	RWLOCK_EXIT(&ipf_nat);
+}
+
+
+#ifdef	_KERNEL
+/*
+ * Slowly expire held state for fragments.  Timeouts are set * in expectation
+ * of this being called twice per second.
+ */
+# if (BSD >= 199306) || SOLARIS || defined(__sgi)
+#  if defined(SOLARIS2) && (SOLARIS2 < 7)
+void ipfr_slowtimer()
+#  else
+void ipfr_slowtimer __P((void *ptr))
+#  endif
+# else
+int ipfr_slowtimer()
+# endif
+{
+	ipfr_t	**fp, *fra;
+	nat_t	*nat;
+	int	idx;
+#if defined(_KERNEL)
+# if !SOLARIS
+	int	s;
+# else
+	extern	int	fr_running;
+
+	if (fr_running <= 0) 
+		return;
+# endif
+#endif
+
+	READ_ENTER(&ipf_solaris);
+#ifdef __sgi
+	ipfilter_sgi_intfsync();
+#endif
+
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_frag);
+
+	/*
+	 * Go through the entire table, looking for entries to expire,
+	 * decreasing the ttl by one for each entry.  If it reaches 0,
+	 * remove it from the chain and free it.
+	 */
+	for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+		for (fp = &ipfr_heads[idx]; (fra = *fp); ) {
+			--fra->ipfr_ttl;
+			if (fra->ipfr_ttl == 0) {
+				*fp = fra->ipfr_next;
+				ipfr_delete(fra);
+				ATOMIC_INC(ipfr_stats.ifs_expire);
+				ATOMIC_DEC(ipfr_inuse);
+			} else
+				fp = &fra->ipfr_next;
+		}
+	RWLOCK_EXIT(&ipf_frag);
+
+	/*
+	 * Same again for the NAT table, except that if the structure also
+	 * still points to a NAT structure, and the NAT structure points back
+	 * at the one to be free'd, NULL the reference from the NAT struct.
+	 * NOTE: We need to grab both mutex's early, and in this order so as
+	 * to prevent a deadlock if both try to expire at the same time.
+	 */
+	WRITE_ENTER(&ipf_nat);
+	WRITE_ENTER(&ipf_natfrag);
+	for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+		for (fp = &ipfr_nattab[idx]; (fra = *fp); ) {
+			--fra->ipfr_ttl;
+			if (fra->ipfr_ttl == 0) {
+				ATOMIC_INC(ipfr_stats.ifs_expire);
+				ATOMIC_DEC(ipfr_inuse);
+				nat = fra->ipfr_data;
+				if (nat != NULL) {
+					if (nat->nat_data == fra)
+						nat->nat_data = NULL;
+				}
+				*fp = fra->ipfr_next;
+				ipfr_delete(fra);
+			} else
+				fp = &fra->ipfr_next;
+		}
+	RWLOCK_EXIT(&ipf_natfrag);
+	RWLOCK_EXIT(&ipf_nat);
+	SPL_X(s);
+	fr_timeoutstate();
+	ip_natexpire();
+	fr_authexpire();
+# if	SOLARIS
+	ipfr_timer_id = timeout(ipfr_slowtimer, NULL, drv_usectohz(500000));
+# else
+#  ifndef linux
+#   if (__FreeBSD_version >= 300000)
+	ipfr_slowtimer_ch = timeout(ipfr_slowtimer, NULL, hz/2);
+#   else
+	timeout(ipfr_slowtimer, NULL, hz/2);
+#   endif
+#  endif
+#  if (BSD < 199306) && !defined(__sgi)
+	return 0;
+#  endif
+# endif
+	RWLOCK_EXIT(&ipf_solaris);
+}
+#endif /* defined(_KERNEL) */
diff --git a/sys/contrib/ipfilter/netinet/ip_frag.h b/sys/contrib/ipfilter/netinet/ip_frag.h
new file mode 100644
index 0000000..0494e9c
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_frag.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_frag.h	1.5 3/24/96
+ * $Id: ip_frag.h,v 2.2 1999/08/06 06:26:38 darrenr Exp $
+ * $FreeBSD$
+ */
+
+#ifndef	__IP_FRAG_H__
+#define	__IP_FRAG_H__
+
+#define	IPFT_SIZE	257
+
+typedef	struct	ipfr	{
+	struct	ipfr	*ipfr_next, *ipfr_prev;
+	void	*ipfr_data;
+	struct	in_addr	ipfr_src;
+	struct	in_addr	ipfr_dst;
+	u_short	ipfr_id;
+	u_char	ipfr_p;
+	u_char	ipfr_tos;
+	u_short	ipfr_off;
+	u_short	ipfr_ttl;
+	frentry_t *ipfr_rule;
+} ipfr_t;
+
+
+typedef	struct	ipfrstat {
+	u_long	ifs_exists;	/* add & already exists */
+	u_long	ifs_nomem;
+	u_long	ifs_new;
+	u_long	ifs_hits;
+	u_long	ifs_expire;
+	u_long	ifs_inuse;
+	struct	ipfr	**ifs_table;
+	struct	ipfr	**ifs_nattab;
+} ipfrstat_t;
+
+#define	IPFR_CMPSZ	(4 + 4 + 2 + 1 + 1)
+
+extern	int	fr_ipfrttl;
+extern	ipfrstat_t	*ipfr_fragstats __P((void));
+extern	int	ipfr_newfrag __P((ip_t *, fr_info_t *, u_int));
+extern	int	ipfr_nat_newfrag __P((ip_t *, fr_info_t *, u_int, struct nat *));
+extern	nat_t	*ipfr_nat_knownfrag __P((ip_t *, fr_info_t *));
+extern	frentry_t *ipfr_knownfrag __P((ip_t *, fr_info_t *));
+extern	void	ipfr_forget __P((void *));
+extern	void	ipfr_unload __P((void));
+
+#if     (BSD >= 199306) || SOLARIS || defined(__sgi)
+# if defined(SOLARIS2) && (SOLARIS2 < 7)
+extern	void	ipfr_slowtimer __P((void));
+# else
+extern	void	ipfr_slowtimer __P((void *));
+# endif
+#else
+extern	int	ipfr_slowtimer __P((void));
+#endif
+
+#endif	/* __IP_FIL_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_ftp_pxy.c b/sys/contrib/ipfilter/netinet/ip_ftp_pxy.c
new file mode 100644
index 0000000..0600617
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_ftp_pxy.c
@@ -0,0 +1,460 @@
+/*
+ * Simple FTP transparent proxy for in-kernel use.  For use with the NAT
+ * code.
+ *
+ * $Id$
+ * $FreeBSD$
+ */
+#if SOLARIS && defined(_KERNEL)
+extern	kmutex_t	ipf_rw;
+#endif
+
+#define	isdigit(x)	((x) >= '0' && (x) <= '9')
+
+#define	IPF_FTP_PROXY
+
+#define	IPF_MINPORTLEN	18
+#define	IPF_MAXPORTLEN	30
+#define	IPF_MIN227LEN	39
+#define	IPF_MAX227LEN	51
+
+
+int ippr_ftp_init __P((void));
+int ippr_ftp_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_ftp_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_ftp_portmsg __P((fr_info_t *, ip_t *, nat_t *));
+int ippr_ftp_pasvmsg __P((fr_info_t *, ip_t *, nat_t *));
+
+u_short ipf_ftp_atoi __P((char **));
+
+static	frentry_t	natfr;
+
+
+/*
+ * Initialize local structures.
+ */
+int ippr_ftp_init()
+{
+	bzero((char *)&natfr, sizeof(natfr));
+	natfr.fr_ref = 1;
+	natfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
+	return 0;
+}
+
+
+/*
+ * ipf_ftp_atoi - implement a version of atoi which processes numbers in
+ * pairs separated by commas (which are expected to be in the range 0 - 255),
+ * returning a 16 bit number combining either side of the , as the MSB and
+ * LSB.
+ */
+u_short ipf_ftp_atoi(ptr)
+char **ptr;
+{
+	register char *s = *ptr, c;
+	register u_char i = 0, j = 0;
+
+	while ((c = *s++) && isdigit(c)) {
+		i *= 10;
+		i += c - '0';
+	}
+	if (c != ',') {
+		*ptr = NULL;
+		return 0;
+	}
+	while ((c = *s++) && isdigit(c)) {
+		j *= 10;
+		j += c - '0';
+	}
+	*ptr = s;
+	return (i << 8) | j;
+}
+
+
+int ippr_ftp_portmsg(fin, ip, nat)
+fr_info_t *fin;
+ip_t *ip;
+nat_t *nat;
+{
+	char portbuf[IPF_MAXPORTLEN + 1], newbuf[IPF_MAXPORTLEN + 1], *s;
+	tcphdr_t *tcp, tcph, *tcp2 = &tcph;
+	size_t nlen = 0, dlen, olen;
+	u_short a5, a6, sp, dp;
+	u_int a1, a2, a3, a4;
+	struct in_addr swip;
+	int off, inc = 0;
+	fr_info_t fi;
+	nat_t *ipn;
+	mb_t *m;
+#if	SOLARIS
+	mb_t *m1;
+#endif
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	bzero(portbuf, sizeof(portbuf));
+	off = (ip->ip_hl << 2) + (tcp->th_off << 2);
+
+#if	SOLARIS
+	m = fin->fin_qfm;
+
+	dlen = msgdsize(m) - off;
+	if (dlen > 0)
+		copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#else
+	m = *(mb_t **)fin->fin_mp;
+
+	dlen = mbufchainlen(m) - off;
+	if (dlen > 0)
+		m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#endif
+	if (dlen == 0)
+		return 0;
+	portbuf[sizeof(portbuf) - 1] = '\0';
+	*newbuf = '\0';
+	if (!strncmp(portbuf, "PORT ", 5)) { 
+		if (dlen < IPF_MINPORTLEN)
+			return 0;
+	} else
+		return 0;
+
+	/*
+	 * Skip the PORT command + space
+	 */
+	s = portbuf + 5;
+	/*
+	 * Pick out the address components, two at a time.
+	 */
+	a1 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+	a2 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+
+	/*
+	 * check that IP address in the PORT/PASV reply is the same as the
+	 * sender of the command - prevents using PORT for port scanning.
+	 */
+	a1 <<= 16;
+	a1 |= a2;
+	if (a1 != ntohl(nat->nat_inip.s_addr))
+		return 0;
+
+	a5 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+	if (*s == ')')
+		s++;
+
+	/*
+	 * check for CR-LF at the end.
+	 */
+	if (*s == '\n')
+		s--;
+	if ((*s == '\r') && (*(s + 1) == '\n')) {
+		s += 2;
+		a6 = a5 & 0xff;
+	} else
+		return 0;
+	a5 >>= 8;
+	/*
+	 * Calculate new address parts for PORT command
+	 */
+	a1 = ntohl(ip->ip_src.s_addr);
+	a2 = (a1 >> 16) & 0xff;
+	a3 = (a1 >> 8) & 0xff;
+	a4 = a1 & 0xff;
+	a1 >>= 24;
+	olen = s - portbuf;
+	(void) snprintf(newbuf, sizeof(newbuf), "%s %u,%u,%u,%u,%u,%u\r\n",
+		       "PORT", a1, a2, a3, a4, a5, a6);
+
+	nlen = strlen(newbuf);
+	inc = nlen - olen;
+#if SOLARIS
+	for (m1 = m; m1->b_cont; m1 = m1->b_cont)
+		;
+	if ((inc > 0) && (m1->b_datap->db_lim - m1->b_wptr < inc)) {
+		mblk_t *nm;
+
+		/* alloc enough to keep same trailer space for lower driver */
+		nm = allocb(nlen, BPRI_MED);
+		PANIC((!nm),("ippr_ftp_out: allocb failed"));
+
+		nm->b_band = m1->b_band;
+		nm->b_wptr += nlen;
+
+		m1->b_wptr -= olen;
+		PANIC((m1->b_wptr < m1->b_rptr),
+		      ("ippr_ftp_out: cannot handle fragmented data block"));
+
+		linkb(m1, nm);
+	} else {
+		if (m1->b_datap->db_struiolim == m1->b_wptr)
+			m1->b_datap->db_struiolim += inc;
+		m1->b_datap->db_struioflag &= ~STRUIO_IP;
+		m1->b_wptr += inc;
+	}
+	copyin_mblk(m, off, nlen, newbuf);
+#else
+	if (inc < 0)
+		m_adj(m, inc);
+	/* the mbuf chain will be extended if necessary by m_copyback() */
+	m_copyback(m, off, nlen, newbuf);
+#endif
+	if (inc != 0) {
+#if SOLARIS || defined(__sgi)
+		register u_32_t	sum1, sum2;
+
+		sum1 = ip->ip_len;
+		sum2 = ip->ip_len + inc;
+
+		/* Because ~1 == -2, We really need ~1 == -1 */
+		if (sum1 > sum2)
+			sum2--;
+		sum2 -= sum1;
+		sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+
+		fix_outcksum(&ip->ip_sum, sum2);
+#endif
+		ip->ip_len += inc;
+	}
+
+	/*
+	 * Add skeleton NAT entry for connection which will come back the
+	 * other way.
+	 */
+	sp = htons(a5 << 8 | a6);
+	/*
+	 * The server may not make the connection back from port 20, but
+	 * it is the most likely so use it here to check for a conflicting
+	 * mapping.
+	 */
+	dp = htons(fin->fin_data[1] - 1);
+	ipn = nat_outlookup(fin->fin_ifp, IPN_TCP, nat->nat_p, nat->nat_inip,
+			    ip->ip_dst, (dp << 16) | sp);
+	if (ipn == NULL) {
+		bcopy((char *)fin, (char *)&fi, sizeof(fi));
+		bzero((char *)tcp2, sizeof(*tcp2));
+		tcp2->th_win = htons(8192);
+		tcp2->th_sport = sp;
+		tcp2->th_dport = 0; /* XXX - don't specify remote port */
+		fi.fin_data[0] = ntohs(sp);
+		fi.fin_data[1] = 0;
+		fi.fin_dp = (char *)tcp2;
+		swip = ip->ip_src;
+		ip->ip_src = nat->nat_inip;
+		ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_DPORT,
+			      NAT_OUTBOUND);
+		if (ipn != NULL) {
+			ipn->nat_age = fr_defnatage;
+			(void) fr_addstate(ip, &fi, FI_W_DPORT);
+		}
+		ip->ip_src = swip;
+	}
+	return inc;
+}
+
+
+int ippr_ftp_out(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	return ippr_ftp_portmsg(fin, ip, nat);
+}
+
+
+int ippr_ftp_pasvmsg(fin, ip, nat)
+fr_info_t *fin;
+ip_t *ip;
+nat_t *nat;
+{
+	char portbuf[IPF_MAX227LEN + 1], newbuf[IPF_MAX227LEN + 1], *s;
+	int off, olen, dlen, nlen = 0, inc = 0;
+	tcphdr_t tcph, *tcp2 = &tcph;
+	struct in_addr swip, swip2;
+	u_short a5, a6, dp, sp;
+	u_int a1, a2, a3, a4;
+	tcphdr_t *tcp;
+	fr_info_t fi;
+	nat_t *ipn;
+	mb_t *m;
+#if	SOLARIS
+	mb_t *m1;
+#endif
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	off = (ip->ip_hl << 2) + (tcp->th_off << 2);
+	m = *(mb_t **)fin->fin_mp;
+	bzero(portbuf, sizeof(portbuf));
+
+#if	SOLARIS
+	m = fin->fin_qfm;
+
+	dlen = msgdsize(m) - off;
+	if (dlen > 0)
+		copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#else
+	dlen = mbufchainlen(m) - off;
+	if (dlen > 0)
+		m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#endif
+	if (dlen == 0)
+		return 0;
+	portbuf[sizeof(portbuf) - 1] = '\0';
+	*newbuf = '\0';
+
+	if (!strncmp(portbuf, "227 ", 4)) {
+		if (dlen < IPF_MIN227LEN)
+			return 0;
+		else if (strncmp(portbuf, "227 Entering Passive Mode", 25))
+			return 0;
+	} else
+		return 0;
+	/*
+	 * Skip the PORT command + space
+	 */
+	s = portbuf + 25;
+	while (*s && !isdigit(*s))
+		s++;
+	/*
+	 * Pick out the address components, two at a time.
+	 */
+	a1 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+	a2 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+
+	/*
+	 * check that IP address in the PORT/PASV reply is the same as the
+	 * sender of the command - prevents using PORT for port scanning.
+	 */
+	a1 <<= 16;
+	a1 |= a2;
+	if (a1 != ntohl(nat->nat_oip.s_addr))
+		return 0;
+
+	a5 = ipf_ftp_atoi(&s);
+	if (!s)
+		return 0;
+
+	if (*s == ')')
+		s++;
+	if (*s == '\n')
+		s--;
+	/*
+	 * check for CR-LF at the end.
+	 */
+	if ((*s == '\r') && (*(s + 1) == '\n')) {
+		s += 2;
+		a6 = a5 & 0xff;
+	} else
+		return 0;
+	a5 >>= 8;
+	/*
+	 * Calculate new address parts for 227 reply
+	 */
+	a1 = ntohl(ip->ip_src.s_addr);
+	a2 = (a1 >> 16) & 0xff;
+	a3 = (a1 >> 8) & 0xff;
+	a4 = a1 & 0xff;
+	a1 >>= 24;
+	olen = s - portbuf;
+	(void) sprintf(newbuf, "%s %u,%u,%u,%u,%u,%u\r\n",
+		       "227 Entering Passive Mode", a1, a2, a3, a4, a5, a6);
+
+	nlen = strlen(newbuf);
+	inc = nlen - olen;
+#if SOLARIS
+	for (m1 = m; m1->b_cont; m1 = m1->b_cont)
+		;
+	if ((inc > 0) && (m1->b_datap->db_lim - m1->b_wptr < inc)) {
+		mblk_t *nm;
+
+		/* alloc enough to keep same trailer space for lower driver */
+		nm = allocb(nlen, BPRI_MED);
+		PANIC((!nm),("ippr_ftp_out: allocb failed"));
+
+		nm->b_band = m1->b_band;
+		nm->b_wptr += nlen;
+
+		m1->b_wptr -= olen;
+		PANIC((m1->b_wptr < m1->b_rptr),
+		      ("ippr_ftp_out: cannot handle fragmented data block"));
+
+		linkb(m1, nm);
+	} else {
+		m1->b_wptr += inc;
+	}
+	copyin_mblk(m, off, nlen, newbuf);
+#else
+	if (inc < 0)
+		m_adj(m, inc);
+	/* the mbuf chain will be extended if necessary by m_copyback() */
+	m_copyback(m, off, nlen, newbuf);
+#endif
+	if (inc != 0) {
+#if SOLARIS || defined(__sgi)
+		register u_32_t	sum1, sum2;
+
+		sum1 = ip->ip_len;
+		sum2 = ip->ip_len + inc;
+
+		/* Because ~1 == -2, We really need ~1 == -1 */
+		if (sum1 > sum2)
+			sum2--;
+		sum2 -= sum1;
+		sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+
+		fix_outcksum(&ip->ip_sum, sum2);
+#endif
+		ip->ip_len += inc;
+	}
+
+	/*
+	 * Add skeleton NAT entry for connection which will come back the
+	 * other way.
+	 */
+	sp = 0;
+	dp = htons(fin->fin_data[1] - 1);
+	ipn = nat_outlookup(fin->fin_ifp, IPN_TCP, nat->nat_p, nat->nat_inip,
+			    ip->ip_dst, (dp << 16) | sp);
+	if (ipn == NULL) {
+		bcopy((char *)fin, (char *)&fi, sizeof(fi));
+		bzero((char *)tcp2, sizeof(*tcp2));
+		tcp2->th_win = htons(8192);
+		tcp2->th_sport = 0;		/* XXX - fake it for nat_new */
+		fi.fin_data[0] = a5 << 8 | a6;
+		tcp2->th_dport = htons(fi.fin_data[0]);
+		fi.fin_data[1] = 0;
+		fi.fin_dp = (char *)tcp2;
+		swip = ip->ip_src;
+		swip2 = ip->ip_dst;
+		ip->ip_dst = ip->ip_src;
+		ip->ip_src = nat->nat_inip;
+		ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_SPORT,
+			      NAT_OUTBOUND);
+		if (ipn != NULL) {
+			ipn->nat_age = fr_defnatage;
+			(void) fr_addstate(ip, &fi, FI_W_SPORT);
+		}
+		ip->ip_src = swip;
+		ip->ip_dst = swip2;
+	}
+	return inc;
+}
+
+
+int ippr_ftp_in(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+
+	return ippr_ftp_pasvmsg(fin, ip, nat);
+}
diff --git a/sys/contrib/ipfilter/netinet/ip_log.c b/sys/contrib/ipfilter/netinet/ip_log.c
new file mode 100644
index 0000000..3a7cda0
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_log.c
@@ -0,0 +1,498 @@
+/*
+ * Copyright (C) 1997-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * $Id: ip_log.c,v 2.1.2.2 1999/09/21 11:55:44 darrenr Exp $
+ * $FreeBSD$
+ */
+#include <sys/param.h>
+#if defined(KERNEL) && !defined(_KERNEL)
+# define       _KERNEL
+#endif
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM)
+# include "opt_ipfilter_log.h"
+#endif
+#ifdef  __FreeBSD__
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+#  if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
+#   include "opt_ipfilter.h"
+#  endif
+# else
+#  include <osreldate.h>
+# endif
+#endif
+#ifdef	IPFILTER_LOG
+# ifndef SOLARIS
+#  define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+# endif
+# ifndef _KERNEL
+#  include <stdio.h>
+#  include <string.h>
+#  include <stdlib.h>
+#  include <ctype.h>
+# endif
+# include <sys/errno.h>
+# include <sys/types.h>
+# include <sys/file.h>
+# if __FreeBSD_version >= 220000 && defined(_KERNEL)
+#  include <sys/fcntl.h>
+#  include <sys/filio.h>
+# else
+#  include <sys/ioctl.h>
+# endif
+# include <sys/time.h>
+# if defined(_KERNEL) && !defined(linux)
+#  include <sys/systm.h>
+# endif
+# include <sys/uio.h>
+# if !SOLARIS
+#  if (NetBSD > 199609) || (OpenBSD > 199603) || (__FreeBSD_version >= 300000)
+#   include <sys/dirent.h>
+#  else
+#   include <sys/dir.h>
+#  endif
+#  ifndef linux
+#   include <sys/mbuf.h>
+#  endif
+# else
+#  include <sys/filio.h>
+#  include <sys/cred.h>
+#  include <sys/ddi.h>
+#  include <sys/sunddi.h>
+#  include <sys/ksynch.h>
+#  include <sys/kmem.h>
+#  include <sys/mkdev.h>
+#  include <sys/dditypes.h>
+#  include <sys/cmn_err.h>
+# endif
+# ifndef linux
+#  include <sys/protosw.h>
+# endif
+# include <sys/socket.h>
+
+# include <net/if.h>
+# ifdef sun
+#  include <net/af.h>
+# endif
+# if __FreeBSD_version >= 300000
+#  include <net/if_var.h>
+# endif
+# include <net/route.h>
+# include <netinet/in.h>
+# ifdef __sgi
+#  include <sys/ddi.h>
+#  ifdef IFF_DRVRLOCK /* IRIX6 */
+#   include <sys/hashing.h>
+#  endif
+# endif
+# if !defined(linux) && !(defined(__sgi) && !defined(IFF_DRVRLOCK)) /*IRIX<6*/
+#  include <netinet/in_var.h>
+# endif
+# include <netinet/in_systm.h>
+# include <netinet/ip.h>
+# include <netinet/tcp.h>
+# include <netinet/udp.h>
+# include <netinet/ip_icmp.h>
+# ifndef linux
+#  include <netinet/ip_var.h>
+# endif
+# ifndef _KERNEL
+#  include <syslog.h>
+# endif
+# include "netinet/ip_compat.h"
+# include <netinet/tcpip.h>
+# include "netinet/ip_fil.h"
+# include "netinet/ip_proxy.h"
+# include "netinet/ip_nat.h"
+# include "netinet/ip_frag.h"
+# include "netinet/ip_state.h"
+# include "netinet/ip_auth.h"
+# if (__FreeBSD_version >= 300000)
+#  include <sys/malloc.h>
+# endif
+
+# ifndef MIN
+#  define	MIN(a,b)	(((a)<(b))?(a):(b))
+# endif
+
+
+# if SOLARIS || defined(__sgi)
+extern	kmutex_t	ipl_mutex;
+#  if SOLARIS
+extern	kcondvar_t	iplwait;
+#  endif
+# endif
+
+iplog_t	**iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1], *ipll[IPL_LOGMAX+1];
+size_t	iplused[IPL_LOGMAX+1];
+static fr_info_t	iplcrc[IPL_LOGMAX+1];
+# ifdef	linux
+static struct wait_queue *iplwait[IPL_LOGMAX+1];
+# endif
+
+
+/*
+ * Initialise log buffers & pointers.  Also iniialised the CRC to a local
+ * secret for use in calculating the "last log checksum".
+ */
+void ipflog_init()
+{
+	int	i;
+
+	for (i = IPL_LOGMAX; i >= 0; i--) {
+		iplt[i] = NULL;
+		ipll[i] = NULL;
+		iplh[i] = &iplt[i];
+		iplused[i] = 0;
+		bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
+	}
+}
+
+
+/*
+ * ipflog
+ * Create a log record for a packet given that it has been triggered by a
+ * rule (or the default setting).  Calculate the transport protocol header
+ * size using predetermined size of a couple of popular protocols and thus
+ * how much data to copy into the log, including part of the data body if
+ * requested.
+ */
+int ipflog(flags, ip, fin, m)
+u_int flags;
+ip_t *ip;
+fr_info_t *fin;
+mb_t *m;
+{
+	ipflog_t ipfl;
+	register size_t mlen, hlen;
+	size_t sizes[2];
+	void *ptrs[2];
+	int types[2];
+# if SOLARIS
+	ill_t *ifp = fin->fin_ifp;
+# else
+	struct ifnet *ifp = fin->fin_ifp;
+# endif
+
+	/*
+	 * calculate header size.
+	 */
+	hlen = fin->fin_hlen;
+	if ((ip->ip_off & IP_OFFMASK) == 0) {
+		if (ip->ip_p == IPPROTO_TCP)
+			hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
+		else if (ip->ip_p == IPPROTO_UDP)
+			hlen += MIN(sizeof(udphdr_t), fin->fin_dlen);
+		else if (ip->ip_p == IPPROTO_ICMP) {
+			struct	icmp	*icmp;
+
+			icmp = (struct icmp *)((char *)ip + hlen);
+	 
+			/*
+			 * For ICMP, if the packet is an error packet, also
+			 * include the information about the packet which
+			 * caused the error.
+			 */
+			switch (icmp->icmp_type)
+			{
+			case ICMP_UNREACH :
+			case ICMP_SOURCEQUENCH :
+			case ICMP_REDIRECT :
+			case ICMP_TIMXCEED :
+			case ICMP_PARAMPROB :
+				hlen += MIN(sizeof(struct icmp) + 8,
+					    fin->fin_dlen);
+				break;
+			default :
+				hlen += MIN(sizeof(struct icmp),
+					    fin->fin_dlen);
+				break;
+			}
+		}
+	}
+	/*
+	 * Get the interface number and name to which this packet is
+	 * currently associated.
+	 */
+# if SOLARIS
+	ipfl.fl_unit = (u_char)ifp->ill_ppa;
+	bcopy(ifp->ill_name, ipfl.fl_ifname, MIN(ifp->ill_name_length, 4));
+	mlen = (flags & FR_LOGBODY) ? MIN(msgdsize(m) - hlen, 128) : 0;
+# else
+#  if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \
+	(defined(OpenBSD) && (OpenBSD >= 199603))
+	strncpy(ipfl.fl_ifname, ifp->if_xname, IFNAMSIZ);
+#  else
+#   ifndef linux
+	ipfl.fl_unit = (u_char)ifp->if_unit;
+#   endif
+	if ((ipfl.fl_ifname[0] = ifp->if_name[0]))
+		if ((ipfl.fl_ifname[1] = ifp->if_name[1]))
+			if ((ipfl.fl_ifname[2] = ifp->if_name[2]))
+				ipfl.fl_ifname[3] = ifp->if_name[3];
+#  endif
+	mlen = (flags & FR_LOGBODY) ? MIN(ip->ip_len - hlen, 128) : 0;
+# endif
+	ipfl.fl_plen = (u_char)mlen;
+	ipfl.fl_hlen = (u_char)hlen;
+	ipfl.fl_rule = fin->fin_rule;
+	ipfl.fl_group = fin->fin_group;
+	if (fin->fin_fr != NULL)
+		ipfl.fl_loglevel = fin->fin_fr->fr_loglevel;
+	else
+		ipfl.fl_loglevel = 0xffff;
+	ipfl.fl_flags = flags;
+	ptrs[0] = (void *)&ipfl;
+	sizes[0] = sizeof(ipfl);
+	types[0] = 0;
+# if SOLARIS
+	/*
+	 * Are we copied from the mblk or an aligned array ?
+	 */
+	if (ip == (ip_t *)m->b_rptr) {
+		ptrs[1] = m;
+		sizes[1] = hlen + mlen;
+		types[1] = 1;
+	} else {
+		ptrs[1] = ip;
+		sizes[1] = hlen + mlen;
+		types[1] = 0;
+	}
+# else
+	ptrs[1] = m;
+	sizes[1] = hlen + mlen;
+	types[1] = 1;
+# endif
+	return ipllog(IPL_LOGIPF, fin, ptrs, sizes, types, 2);
+}
+
+
+/*
+ * ipllog
+ */
+int ipllog(dev, fin, items, itemsz, types, cnt)
+int dev;
+fr_info_t *fin;
+void **items;
+size_t *itemsz;
+int *types, cnt;
+{
+	caddr_t buf, s;
+	iplog_t *ipl;
+	size_t len;
+	int i;
+ 
+	/*
+	 * Check to see if this log record has a CRC which matches the last
+	 * record logged.  If it does, just up the count on the previous one
+	 * rather than create a new one.
+	 */
+	MUTEX_ENTER(&ipl_mutex);
+	if (fin != NULL) {
+		if ((ipll[dev] != NULL) &&
+		    bcmp((char *)fin, (char *)&iplcrc[dev], FI_CSIZE) == 0) {
+			ipll[dev]->ipl_count++;
+			MUTEX_EXIT(&ipl_mutex);
+			return 1;
+		}
+		bcopy((char *)fin, (char *)&iplcrc[dev], FI_CSIZE);
+	} else
+		bzero((char *)&iplcrc[dev], FI_CSIZE);
+	MUTEX_EXIT(&ipl_mutex);
+
+	/*
+	 * Get the total amount of data to be logged.
+	 */
+	for (i = 0, len = sizeof(iplog_t); i < cnt; i++)
+		len += itemsz[i];
+
+	/*
+	 * check that we have space to record this information and can
+	 * allocate that much.
+	 */
+	KMALLOCS(buf, caddr_t, len);
+	if (!buf)
+		return 0;
+	MUTEX_ENTER(&ipl_mutex);
+	if ((iplused[dev] + len) > IPLLOGSIZE) {
+		MUTEX_EXIT(&ipl_mutex);
+		KFREES(buf, len);
+		return 0;
+	}
+	iplused[dev] += len;
+	MUTEX_EXIT(&ipl_mutex);
+
+	/*
+	 * advance the log pointer to the next empty record and deduct the
+	 * amount of space we're going to use.
+	 */
+	ipl = (iplog_t *)buf;
+	ipl->ipl_magic = IPL_MAGIC;
+	ipl->ipl_count = 1;
+	ipl->ipl_next = NULL;
+	ipl->ipl_dsize = len;
+# if SOLARIS || defined(sun) || defined(linux)
+	uniqtime((struct timeval *)&ipl->ipl_sec);
+# else
+#  if BSD >= 199306 || defined(__FreeBSD__) || defined(__sgi)
+	microtime((struct timeval *)&ipl->ipl_sec);
+#  endif
+# endif
+
+	/*
+	 * Loop through all the items to be logged, copying each one to the
+	 * buffer.  Use bcopy for normal data or the mb_t copyout routine.
+	 */
+	for (i = 0, s = buf + sizeof(*ipl); i < cnt; i++) {
+		if (types[i] == 0)
+			bcopy(items[i], s, itemsz[i]);
+		else if (types[i] == 1) {
+# if SOLARIS
+			copyout_mblk(items[i], 0, itemsz[i], s);
+# else
+			m_copydata(items[i], 0, itemsz[i], s);
+# endif
+		}
+		s += itemsz[i];
+	}
+	MUTEX_ENTER(&ipl_mutex);
+	ipll[dev] = ipl;
+	*iplh[dev] = ipl;
+	iplh[dev] = &ipl->ipl_next;
+# if SOLARIS
+	cv_signal(&iplwait);
+	mutex_exit(&ipl_mutex);
+# else
+	MUTEX_EXIT(&ipl_mutex);
+#  ifdef linux
+	wake_up_interruptible(&iplwait[dev]);
+#  else
+	wakeup(&iplh[dev]);
+#  endif
+# endif
+	return 1;
+}
+
+
+int ipflog_read(unit, uio)
+minor_t unit;
+struct uio *uio;
+{
+	size_t dlen, copied;
+	int error = 0;
+	iplog_t *ipl;
+# if defined(_KERNEL) && !SOLARIS
+	int s;
+# endif
+
+	/*
+	 * Sanity checks.  Make sure the minor # is valid and we're copying
+	 * a valid chunk of data.
+	 */
+	if (IPL_LOGMAX < unit)
+		return ENXIO;
+	if (!uio->uio_resid)
+		return 0;
+	if ((uio->uio_resid < sizeof(iplog_t)) ||
+	    (uio->uio_resid > IPLLOGSIZE))
+		return EINVAL;
+ 
+	/*
+	 * Lock the log so we can snapshot the variables.  Wait for a signal
+	 * if the log is empty.
+	 */
+	SPL_NET(s);
+	MUTEX_ENTER(&ipl_mutex);
+
+	while (!iplused[unit] || !iplt[unit]) {
+# if SOLARIS && defined(_KERNEL)
+		if (!cv_wait_sig(&iplwait, &ipl_mutex)) {
+			MUTEX_EXIT(&ipl_mutex);
+			return EINTR;
+		}
+# else
+#  ifdef linux
+		interruptible_sleep_on(&iplwait[unit]);
+		if (current->signal & ~current->blocked)
+			return -EINTR;
+#  else
+		MUTEX_EXIT(&ipl_mutex);
+		SPL_X(s);
+		error = SLEEP(&iplh[unit], "ipl sleep");
+		if (error)
+			return error;
+		SPL_NET(s);
+		MUTEX_ENTER(&ipl_mutex);
+#  endif /* linux */
+# endif /* SOLARIS */
+	}
+
+# if BSD >= 199306 || defined(__FreeBSD__)
+	uio->uio_rw = UIO_READ;
+# endif
+
+	for (copied = 0; (ipl = iplt[unit]); copied += dlen) {
+		dlen = ipl->ipl_dsize;
+		if (dlen > uio->uio_resid)
+			break;
+		/*
+		 * Don't hold the mutex over the uiomove call.
+		 */
+		iplt[unit] = ipl->ipl_next;
+		iplused[unit] -= dlen;
+		MUTEX_EXIT(&ipl_mutex);
+		SPL_X(s);
+		error = UIOMOVE((caddr_t)ipl, dlen, UIO_READ, uio);
+		if (error) {
+			SPL_NET(s);
+			MUTEX_ENTER(&ipl_mutex);
+			ipl->ipl_next = iplt[unit];
+			iplt[unit] = ipl;
+			iplused[unit] += dlen;
+			break;
+		}
+		KFREES((caddr_t)ipl, dlen);
+		SPL_NET(s);
+		MUTEX_ENTER(&ipl_mutex);
+	}
+	if (!iplt[unit]) {
+		iplused[unit] = 0;
+		iplh[unit] = &iplt[unit];
+		ipll[unit] = NULL;
+	}
+
+	MUTEX_EXIT(&ipl_mutex);
+	SPL_X(s);
+# ifdef 	linux
+	if (!error)
+		return (int)copied;
+	return -error;
+# else
+	return error;
+# endif
+}
+
+
+int ipflog_clear(unit)
+minor_t unit;
+{
+	iplog_t *ipl;
+	int used;
+
+	MUTEX_ENTER(&ipl_mutex);
+	while ((ipl = iplt[unit])) {
+		iplt[unit] = ipl->ipl_next;
+		KFREES((caddr_t)ipl, ipl->ipl_dsize);
+	}
+	iplh[unit] = &iplt[unit];
+	ipll[unit] = NULL;
+	used = iplused[unit];
+	iplused[unit] = 0;
+	bzero((char *)&iplcrc[unit], FI_CSIZE);
+	MUTEX_EXIT(&ipl_mutex);
+	return used;
+}
+#endif /* IPFILTER_LOG */
diff --git a/sys/contrib/ipfilter/netinet/ip_nat.c b/sys/contrib/ipfilter/netinet/ip_nat.c
new file mode 100644
index 0000000..e85bc57
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_nat.c
@@ -0,0 +1,1741 @@
+/*
+ * Copyright (C) 1995-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * Added redirect stuff and a LOT of bug fixes. (mcn@EnGarde.com)
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)ip_nat.c	1.11 6/5/96 (C) 1995 Darren Reed";
+/*static const char rcsid[] = "@(#)$Id: ip_nat.c,v 2.2.2.5 1999/10/05 12:58:33 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#if defined(__FreeBSD__) && defined(KERNEL) && !defined(_KERNEL)
+#define _KERNEL
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
+    defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+#endif
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+#endif
+#if defined(KERNEL) && (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/fcntl.h>
+#include <sys/uio.h>
+#ifndef linux
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(_KERNEL) && !defined(linux)
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/filio.h>
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+#  include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+#if __FreeBSD_version >= 300000
+# include <sys/queue.h>
+#endif
+#include <net/if.h>
+#if __FreeBSD_version >= 300000
+# include <net/if_var.h>
+# if defined(_KERNEL) && !defined(IPFILTER_LKM)
+#  include "opt_ipfilter.h"
+# endif
+#endif
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+
+#ifdef __sgi
+# ifdef IFF_DRVRLOCK /* IRIX6 */
+#include <sys/hashing.h>
+#include <netinet/in_var.h>
+# endif
+#endif
+
+#ifdef RFC1825
+# include <vpn/md5.h>
+# include <vpn/ipsec.h>
+extern struct ifnet vpnif;
+#endif
+
+#ifndef linux
+# include <netinet/ip_var.h>
+#endif
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_state.h"
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+#endif
+#ifndef	MIN
+# define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+#undef	SOCKADDR_IN
+#define	SOCKADDR_IN	struct sockaddr_in
+
+nat_t	**nat_table[2] = { NULL, NULL },
+	*nat_instances = NULL;
+#if	(SOLARIS || defined(__sgi)) && defined(_KERNEL)
+ipnat_t	*nat_list = NULL;
+#else
+static	ipnat_t	*nat_list = NULL;
+#endif
+u_int	ipf_nattable_sz = NAT_TABLE_SZ;
+u_int	ipf_natrules_sz = NAT_SIZE;
+u_int	ipf_rdrrules_sz = RDR_SIZE;
+u_32_t	nat_masks = 0;
+u_32_t	rdr_masks = 0;
+ipnat_t	**nat_rules = NULL;
+ipnat_t	**rdr_rules = NULL;
+
+u_long	fr_defnatage = DEF_NAT_AGE,
+	fr_defnaticmpage = 6;		/* 3 seconds */
+static natstat_t nat_stats;
+#if	(SOLARIS || defined(__sgi)) && defined(_KERNEL)
+extern	kmutex_t	ipf_rw;
+extern	KRWLOCK_T	ipf_nat;
+#endif
+
+static	int	nat_flushtable __P((void));
+static	int	nat_clearlist __P((void));
+static	void	nat_delete __P((struct nat *));
+static	void	nat_delrdr __P((struct ipnat *));
+static	void	nat_delnat __P((struct ipnat *));
+
+
+int nat_init()
+{
+	KMALLOCS(nat_table[0], nat_t **, sizeof(nat_t *) * ipf_nattable_sz);
+	if (nat_table[0] != NULL)
+		bzero((char *)nat_table[0], ipf_nattable_sz * sizeof(nat_t *));
+	else
+		return -1;
+
+	KMALLOCS(nat_table[1], nat_t **, sizeof(nat_t *) * ipf_nattable_sz);
+	if (nat_table[1] != NULL)
+		bzero((char *)nat_table[1], ipf_nattable_sz * sizeof(nat_t *));
+	else
+		return -1;
+
+	KMALLOCS(nat_rules, ipnat_t **, sizeof(ipnat_t *) * ipf_natrules_sz);
+	if (nat_rules != NULL)
+		bzero((char *)nat_rules, ipf_natrules_sz * sizeof(ipnat_t *));
+	else
+		return -1;
+
+	KMALLOCS(rdr_rules, ipnat_t **, sizeof(ipnat_t *) * ipf_rdrrules_sz);
+	if (rdr_rules != NULL)
+		bzero((char *)rdr_rules, ipf_rdrrules_sz * sizeof(ipnat_t *));
+	else
+		return -1;
+	return 0;
+}
+
+
+void nat_delrdr(n)
+ipnat_t *n;
+{
+	ipnat_t **n1;
+	u_32_t iph;
+	u_int hv;
+
+	iph = n->in_outip & n->in_outmsk;
+	hv = NAT_HASH_FN(iph, ipf_rdrrules_sz);
+	for (n1 = &rdr_rules[hv]; *n1 && (*n1 != n); n1 = &(*n1)->in_rnext)
+		;
+	if (*n1)
+		*n1 = n->in_rnext;
+}
+
+
+static void nat_delnat(n)
+ipnat_t *n;
+{
+	ipnat_t **n1;
+	u_32_t iph;
+	u_int hv;
+
+	iph = n->in_inip & n->in_inmsk;
+	hv = NAT_HASH_FN(iph, ipf_natrules_sz);
+	for (n1 = &nat_rules[hv]; *n1 && (*n1 != n); n1 = &(*n1)->in_mnext)
+		;
+	if (*n1)
+		*n1 = n->in_mnext;
+}
+
+
+void fix_outcksum(sp, n)
+u_short *sp;
+u_32_t n;
+{
+	register u_short sumshort;
+	register u_32_t sum1;
+
+	if (!n)
+		return;
+	sum1 = (~ntohs(*sp)) & 0xffff;
+	sum1 += (n);
+	sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+	/* Again */
+	sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+	sumshort = ~(u_short)sum1;
+	*(sp) = htons(sumshort);
+}
+
+
+void fix_incksum(sp, n)
+u_short *sp;
+u_32_t n;
+{
+	register u_short sumshort;
+	register u_32_t sum1;
+
+	if (!n)
+		return;
+#ifdef sparc
+	sum1 = (~(*sp)) & 0xffff;
+#else
+	sum1 = (~ntohs(*sp)) & 0xffff;
+#endif
+	sum1 += ~(n) & 0xffff;
+	sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+	/* Again */
+	sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+	sumshort = ~(u_short)sum1;
+	*(sp) = htons(sumshort);
+}
+
+
+/*
+ * How the NAT is organised and works.
+ *
+ * Inside (interface y) NAT       Outside (interface x)
+ * -------------------- -+- -------------------------------------
+ * Packet going          |   out, processsed by ip_natout() for x
+ * ------------>         |   ------------>
+ * src=10.1.1.1          |   src=192.1.1.1
+ *                       |
+ *                       |   in, processed by ip_natin() for x
+ * <------------         |   <------------
+ * dst=10.1.1.1          |   dst=192.1.1.1
+ * -------------------- -+- -------------------------------------
+ * ip_natout() - changes ip_src and if required, sport
+ *             - creates a new mapping, if required.
+ * ip_natin()  - changes ip_dst and if required, dport
+ *
+ * In the NAT table, internal source is recorded as "in" and externally
+ * seen as "out".
+ */
+
+/*
+ * Handle ioctls which manipulate the NAT.
+ */
+int nat_ioctl(data, cmd, mode)
+#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
+u_long cmd;
+#else
+int cmd;
+#endif
+caddr_t data;
+int mode;
+{
+	register ipnat_t *nat, *nt, *n = NULL, **np = NULL;
+	int error = 0, ret, k;
+	ipnat_t natd;
+	u_32_t i, j;
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+
+#if (BSD >= 199306) && defined(_KERNEL)
+	if ((securelevel >= 2) && (mode & FWRITE))
+		return EPERM;
+#endif
+
+	nat = NULL;     /* XXX gcc -Wuninitialized */
+	KMALLOC(nt, ipnat_t *);
+	if ((cmd == SIOCADNAT) || (cmd == SIOCRMNAT))
+		IRCOPY(data, (char *)&natd, sizeof(natd));
+
+	/*
+	 * For add/delete, look to see if the NAT entry is already present
+	 */
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_nat);
+	if ((cmd == SIOCADNAT) || (cmd == SIOCRMNAT)) {
+		nat = &natd;
+		nat->in_flags &= IPN_USERFLAGS;
+		if ((nat->in_redir & NAT_MAPBLK) == 0) {
+			nat->in_inip &= nat->in_inmsk;
+			if ((nat->in_flags & IPN_RANGE) == 0)
+				nat->in_outip &= nat->in_outmsk;
+		}
+		for (np = &nat_list; (n = *np); np = &n->in_next)
+			if (!bcmp((char *)&nat->in_flags, (char *)&n->in_flags,
+					IPN_CMPSIZ))
+				break;
+	}
+
+	switch (cmd)
+	{
+	case SIOCADNAT :
+		if (!(mode & FWRITE)) {
+			error = EPERM;
+			break;
+		}
+		if (n) {
+			error = EEXIST;
+			break;
+		}
+		if (nt == NULL) {
+			error = ENOMEM;
+			break;
+		}
+		n = nt;
+		nt = NULL;
+		bcopy((char *)nat, (char *)n, sizeof(*n));
+		n->in_ifp = (void *)GETUNIT(n->in_ifname);
+		if (!n->in_ifp)
+			n->in_ifp = (void *)-1;
+		if (n->in_plabel[0] != '\0') {
+			n->in_apr = appr_match(n->in_p, n->in_plabel);
+			if (!n->in_apr) {
+				error = ENOENT;
+				break;
+			}
+		}
+		n->in_next = NULL;
+		*np = n;
+
+		if (n->in_redir & NAT_REDIRECT) {
+			u_int hv;
+
+			k = countbits(n->in_outmsk);
+			if ((k >= 0) && (k != 32))
+				rdr_masks |= 1 << k;
+			j = (n->in_outip & n->in_outmsk);
+			hv = NAT_HASH_FN(j, ipf_rdrrules_sz);
+			np = rdr_rules + hv;
+			while (*np != NULL)
+				np = &(*np)->in_rnext;
+			n->in_rnext = NULL;
+			*np = n;
+		}
+		if (n->in_redir & (NAT_MAP|NAT_MAPBLK)) {
+			u_int hv;
+
+			k = countbits(n->in_inmsk);
+			if ((k >= 0) && (k != 32))
+				nat_masks |= 1 << k;
+			j = (n->in_inip & n->in_inmsk);
+			hv = NAT_HASH_FN(j, ipf_natrules_sz);
+			np = nat_rules + hv;
+			while (*np != NULL)
+				np = &(*np)->in_mnext;
+			n->in_mnext = NULL;
+			*np = n;
+		}
+
+		n->in_use = 0;
+		if (n->in_redir & NAT_MAPBLK)
+			n->in_space = USABLE_PORTS * ~ntohl(n->in_outmsk);
+		else if (n->in_flags & IPN_AUTOPORTMAP)
+			n->in_space = USABLE_PORTS * ~ntohl(n->in_inmsk);
+		else if (n->in_flags & IPN_RANGE)
+			n->in_space = ntohl(n->in_outmsk) - ntohl(n->in_outip);
+		else
+			n->in_space = ~ntohl(n->in_outmsk);
+		/*
+		 * Calculate the number of valid IP addresses in the output
+		 * mapping range.  In all cases, the range is inclusive of
+		 * the start and ending IP addresses.
+		 * If to a CIDR address, lose 2: broadcast + network address
+		 *                               (so subtract 1)
+		 * If to a range, add one.
+		 * If to a single IP address, set to 1.
+		 */
+		if (n->in_space) {
+			if ((n->in_flags & IPN_RANGE) != 0)
+				n->in_space += 1;
+			else
+				n->in_space -= 1;
+		} else
+			n->in_space = 1;
+		if ((n->in_outmsk != 0xffffffff) && (n->in_outmsk != 0) &&
+		    ((n->in_flags & IPN_RANGE) == 0))
+			n->in_nip = ntohl(n->in_outip) + 1;
+		else
+			n->in_nip = ntohl(n->in_outip);
+		if (n->in_redir & NAT_MAP) {
+			n->in_pnext = ntohs(n->in_pmin);
+			/*
+			 * Multiply by the number of ports made available.
+			 */
+			if (ntohs(n->in_pmax) >= ntohs(n->in_pmin)) {
+				n->in_space *= (ntohs(n->in_pmax) -
+						ntohs(n->in_pmin) + 1);
+				/*
+				 * Because two different sources can map to
+				 * different destinations but use the same
+				 * local IP#/port #.
+				 * If the result is smaller than in_space, then
+				 * we may have wrapped around 32bits.
+				 */
+				i = n->in_inmsk;
+				if ((i != 0) && (i != 0xffffffff)) {
+					j = n->in_space * (~ntohl(i) + 1);
+					if (j >= n->in_space)
+						n->in_space = j;
+					else
+						n->in_space = 0xffffffff;
+				}
+			}
+			/*
+			 * If no protocol is specified, multiple by 256.
+			 */
+			if ((n->in_flags & IPN_TCPUDP) == 0) {
+					j = n->in_space * 256;
+					if (j >= n->in_space)
+						n->in_space = j;
+					else
+						n->in_space = 0xffffffff;
+			}
+		}
+		/* Otherwise, these fields are preset */
+		n = NULL;
+		nat_stats.ns_rules++;
+		break;
+	case SIOCRMNAT :
+		if (!(mode & FWRITE)) {
+			error = EPERM;
+			n = NULL;
+			break;
+		}
+		if (!n) {
+			error = ESRCH;
+			break;
+		}
+		if (n->in_redir & NAT_REDIRECT)
+			nat_delrdr(n);
+		if (n->in_redir & (NAT_MAPBLK|NAT_MAP))
+			nat_delnat(n);
+		if (nat_list == NULL) {
+			nat_masks = 0;
+			rdr_masks = 0;
+		}
+		*np = n->in_next;
+		if (!n->in_use) {
+			if (n->in_apr)
+				appr_free(n->in_apr);
+			KFREE(n);
+			nat_stats.ns_rules--;
+		} else {
+			n->in_flags |= IPN_DELETE;
+			n->in_next = NULL;
+		}
+		n = NULL;
+		break;
+	case SIOCGNATS :
+		MUTEX_DOWNGRADE(&ipf_nat);
+		nat_stats.ns_table[0] = nat_table[0];
+		nat_stats.ns_table[1] = nat_table[1];
+		nat_stats.ns_list = nat_list;
+		nat_stats.ns_nattab_sz = ipf_nattable_sz;
+		nat_stats.ns_rultab_sz = ipf_natrules_sz;
+		nat_stats.ns_rdrtab_sz = ipf_rdrrules_sz;
+		nat_stats.ns_instances = nat_instances;
+		nat_stats.ns_apslist = ap_sess_list;
+		IWCOPY((char *)&nat_stats, (char *)data, sizeof(nat_stats));
+		break;
+	case SIOCGNATL :
+	    {
+		natlookup_t nl;
+
+		MUTEX_DOWNGRADE(&ipf_nat);
+		IRCOPY((char *)data, (char *)&nl, sizeof(nl));
+
+		if (nat_lookupredir(&nl)) {
+			IWCOPY((char *)&nl, (char *)data, sizeof(nl));
+		} else
+			error = ESRCH;
+		break;
+	    }
+	case SIOCFLNAT :
+		if (!(mode & FWRITE)) {
+			error = EPERM;
+			break;
+		}
+		ret = nat_flushtable();
+		MUTEX_DOWNGRADE(&ipf_nat);
+		IWCOPY((caddr_t)&ret, data, sizeof(ret));
+		break;
+	case SIOCCNATL :
+		if (!(mode & FWRITE)) {
+			error = EPERM;
+			break;
+		}
+		ret = nat_clearlist();
+		MUTEX_DOWNGRADE(&ipf_nat);
+		IWCOPY((caddr_t)&ret, data, sizeof(ret));
+		break;
+	case FIONREAD :
+#ifdef	IPFILTER_LOG
+		MUTEX_DOWNGRADE(&ipf_nat);
+		IWCOPY((caddr_t)&iplused[IPL_LOGNAT], (caddr_t)data,
+		       sizeof(iplused[IPL_LOGNAT]));
+#endif
+		break;
+	default :
+		error = EINVAL;
+		break;
+	}
+	RWLOCK_EXIT(&ipf_nat);			/* READ/WRITE */
+	SPL_X(s);
+	if (nt)
+		KFREE(nt);
+	return error;
+}
+
+
+/*
+ * Delete a nat entry from the various lists and table.
+ */
+static void nat_delete(natd)
+struct nat *natd;
+{
+	register struct nat **natp, *nat;
+	struct ipnat *ipn;
+
+	for (natp = natd->nat_hstart[0]; (nat = *natp);
+	     natp = &nat->nat_hnext[0])
+		if (nat == natd) {
+			*natp = nat->nat_hnext[0];
+			break;
+		}
+
+	for (natp = natd->nat_hstart[1]; (nat = *natp);
+	     natp = &nat->nat_hnext[1])
+		if (nat == natd) {
+			*natp = nat->nat_hnext[1];
+			break;
+		}
+
+	if (natd->nat_fr != NULL) {
+		ATOMIC_DEC(natd->nat_fr->fr_ref);
+	}
+	/*
+	 * If there is an active reference from the nat entry to its parent
+	 * rule, decrement the rule's reference count and free it too if no
+	 * longer being used.
+	 */
+	ipn = natd->nat_ptr;
+	if (ipn != NULL) {
+		ipn->in_space++;
+		ipn->in_use--;
+		if (!ipn->in_use && (ipn->in_flags & IPN_DELETE)) {
+			if (ipn->in_apr)
+				appr_free(ipn->in_apr);
+			KFREE(ipn);
+			nat_stats.ns_rules--;
+		}
+	}
+
+	/*
+	 * If there's a fragment table entry too for this nat entry, then
+	 * dereference that as well.
+	 */
+	ipfr_forget((void *)natd);
+	aps_free(natd->nat_aps);
+	nat_stats.ns_inuse--;
+	KFREE(natd);
+}
+
+
+/*
+ * nat_flushtable - clear the NAT table of all mapping entries.
+ */
+static int nat_flushtable()
+{
+	register nat_t *nat, **natp;
+	register int j = 0;
+  
+	/*
+	 * ALL NAT mappings deleted, so lets just make the deletions
+	 * quicker.
+	 */
+	if (nat_table[0] != NULL)
+		bzero((char *)nat_table[0],
+		      sizeof(nat_table[0]) * ipf_nattable_sz);
+	if (nat_table[1] != NULL)
+		bzero((char *)nat_table[1],
+		      sizeof(nat_table[1]) * ipf_nattable_sz);
+
+	for (natp = &nat_instances; (nat = *natp); ) {
+		*natp = nat->nat_next;
+		nat_delete(nat);
+		j++;
+	}
+	nat_stats.ns_inuse = 0;
+	return j;
+}
+
+
+/*
+ * nat_clearlist - delete all rules in the active NAT mapping list.
+ */
+static int nat_clearlist()
+{
+	register ipnat_t *n, **np = &nat_list;
+	int i = 0;
+
+	if (nat_rules != NULL)
+		bzero((char *)nat_rules, sizeof(*nat_rules) * ipf_natrules_sz);
+	if (rdr_rules != NULL)
+		bzero((char *)rdr_rules, sizeof(*rdr_rules) * ipf_rdrrules_sz);
+
+	while ((n = *np)) {
+		*np = n->in_next;
+		if (!n->in_use) {
+			if (n->in_apr)
+				appr_free(n->in_apr);
+			KFREE(n);
+			nat_stats.ns_rules--;
+		} else {
+			n->in_flags |= IPN_DELETE;
+			n->in_next = NULL;
+		}
+		i++;
+	}
+	nat_masks = 0;
+	rdr_masks = 0;
+	return i;
+}
+
+
+/*
+ * Create a new NAT table entry.
+ * NOTE: assumes write lock on ipf_nat has been obtained already.
+ */
+nat_t *nat_new(np, ip, fin, flags, direction)
+ipnat_t *np;
+ip_t *ip;
+fr_info_t *fin;
+u_int flags;
+int direction;
+{
+	register u_32_t sum1, sum2, sumd, l;
+	u_short port = 0, sport = 0, dport = 0, nport = 0;
+	nat_t *nat, **natp, *natl = NULL;
+	struct in_addr in, inb;
+	tcphdr_t *tcp = NULL;
+	u_short nflags;
+	u_int hv;
+
+	nflags = flags & np->in_flags;
+	if (flags & IPN_TCPUDP) {
+		tcp = (tcphdr_t *)fin->fin_dp;
+		sport = tcp->th_sport;
+		dport = tcp->th_dport;
+	}
+
+	/* Give me a new nat */
+	KMALLOC(nat, nat_t *);
+	if (nat == NULL)
+		return NULL;
+
+	bzero((char *)nat, sizeof(*nat));
+	nat->nat_flags = flags;
+	/*
+	 * Search the current table for a match.
+	 */
+	if (direction == NAT_OUTBOUND) {
+		/*
+		 * Values at which the search for a free resouce starts.
+		 */
+		u_32_t st_ip;
+		u_short st_port;
+
+		/*
+		 * If it's an outbound packet which doesn't match any existing
+		 * record, then create a new port
+		 */
+		l = 0;
+		st_ip = np->in_nip;
+		st_port = np->in_pnext;
+
+		do {
+			port = 0;
+			in.s_addr = np->in_nip;
+			if (l == 0) {
+				natl = nat_maplookup(fin->fin_ifp, flags,
+						     ip->ip_src, ip->ip_dst);
+				if (natl != NULL) {
+					in = natl->nat_outip;
+#ifndef sparc
+					in.s_addr = ntohl(in.s_addr);
+#endif
+				}
+			}
+
+			if ((np->in_outmsk == 0xffffffff) &&
+			    (np->in_pnext == 0)) {
+				if (l > 0) {
+					KFREE(nat);
+					return NULL;
+				}
+			}
+
+			if (np->in_redir & NAT_MAPBLK) {
+				if ((l >= np->in_ppip) || ((l > 0) &&
+				     !(flags & IPN_TCPUDP))) {
+					KFREE(nat);
+					return NULL;
+				}
+				/*
+				 * map-block - Calculate destination address.
+				 */
+				in.s_addr = ntohl(ip->ip_src.s_addr);
+				in.s_addr &= ntohl(~np->in_inmsk);
+				inb.s_addr = in.s_addr;
+				in.s_addr /= np->in_ippip;
+				in.s_addr &= ntohl(~np->in_outmsk);
+				in.s_addr += ntohl(np->in_outip);
+				/*
+				 * Calculate destination port.
+				 */
+				if ((flags & IPN_TCPUDP) &&
+				    (np->in_ppip != 0)) {
+					port = ntohs(sport) + l;
+					port %= np->in_ppip;
+					port += np->in_ppip *
+						(inb.s_addr % np->in_ippip);
+					port += MAPBLK_MINPORT;
+					port = htons(port);
+				}
+			} else if (!in.s_addr &&
+				   (np->in_outmsk == 0xffffffff)) {
+				/*
+				 * 0/32 - use the interface's IP address.
+				 */
+				if ((l > 0) ||
+				    fr_ifpaddr(fin->fin_ifp, &in) == -1) {
+					KFREE(nat);
+					return NULL;
+				}
+			} else if (!in.s_addr && !np->in_outmsk) {
+				/*
+				 * 0/0 - use the original source address/port.
+				 */
+				if (l > 0) {
+					KFREE(nat);
+					return NULL;
+				}
+				in.s_addr = ntohl(ip->ip_src.s_addr);
+			} else if ((np->in_outmsk != 0xffffffff) &&
+				   (np->in_pnext == 0) &&
+				   ((l > 0) || (natl == NULL)))
+				np->in_nip++;
+			natl = NULL;
+
+			if ((nflags & IPN_TCPUDP) &&
+			    ((np->in_redir & NAT_MAPBLK) == 0) &&
+			    (np->in_flags & IPN_AUTOPORTMAP)) {
+				if ((l > 0) && (l % np->in_ppip == 0)) {
+					if (l > np->in_space) {
+						KFREE(nat);
+						return NULL;
+					} else if ((l > np->in_ppip) &&
+						   np->in_outmsk != 0xffffffff)
+						np->in_nip++;
+				}
+				if (np->in_ppip != 0) {
+					port = ntohs(sport);
+					port += (l % np->in_ppip);
+					port %= np->in_ppip;
+					port += np->in_ppip *
+						(ntohl(ip->ip_src.s_addr) %
+						 np->in_ippip);
+					port += MAPBLK_MINPORT;
+					port = htons(port);
+				}
+			} else if (((np->in_redir & NAT_MAPBLK) == 0) &&
+				   (nflags & IPN_TCPUDP) &&
+				   (np->in_pnext != 0)) {
+				port = htons(np->in_pnext++);
+				if (np->in_pnext > ntohs(np->in_pmax)) {
+					np->in_pnext = ntohs(np->in_pmin);
+					if (np->in_outmsk != 0xffffffff)
+						np->in_nip++;
+				}
+			}
+
+			if (np->in_flags & IPN_RANGE) {
+				if (np->in_nip >= ntohl(np->in_outmsk))
+					np->in_nip = ntohl(np->in_outip);
+			} else {
+				if ((np->in_outmsk != 0xffffffff) &&
+				    ((np->in_nip + 1) & ntohl(np->in_outmsk)) >
+				    ntohl(np->in_outip))
+					np->in_nip = ntohl(np->in_outip) + 1;
+			}
+
+			if (!port && (flags & IPN_TCPUDP))
+				port = sport;
+
+			/*
+			 * Here we do a lookup of the connection as seen from
+			 * the outside.  If an IP# pair already exists, try
+			 * again.  So if you have A->B becomes C->B, you can
+			 * also have D->E become C->E but not D->B causing
+			 * another C->B.  Also take protocol and ports into
+			 * account when determining whether a pre-existing
+			 * NAT setup will cause an external conflict where
+			 * this is appropriate.
+			 */
+			inb.s_addr = htonl(in.s_addr);
+			natl = nat_inlookup(fin->fin_ifp, flags,
+					    (u_int)ip->ip_p, ip->ip_dst, inb,
+					    (port << 16) | dport);
+
+			/*
+			 * Has the search wrapped around and come back to the
+			 * start ?
+			 */
+			if ((natl != NULL) &&
+			    (np->in_pnext != 0) && (st_port == np->in_pnext) &&
+			    (np->in_nip != 0) && (st_ip == np->in_nip)) {
+				KFREE(nat);
+				return NULL;
+			}
+			l++;
+		} while (natl != NULL);
+
+		if (np->in_space > 0)
+			np->in_space--;
+
+		/* Setup the NAT table */
+		nat->nat_inip = ip->ip_src;
+		nat->nat_outip.s_addr = htonl(in.s_addr);
+		nat->nat_oip = ip->ip_dst;
+
+		sum1 = LONG_SUM(ntohl(ip->ip_src.s_addr)) + ntohs(sport);
+		sum2 = LONG_SUM(in.s_addr) + ntohs(port);
+
+		if (flags & IPN_TCPUDP) {
+			nat->nat_inport = sport;
+			nat->nat_outport = port;	/* sport */
+			nat->nat_oport = dport;
+		}
+	} else {
+		/*
+		 * Otherwise, it's an inbound packet. Most likely, we don't
+		 * want to rewrite source ports and source addresses. Instead,
+		 * we want to rewrite to a fixed internal address and fixed
+		 * internal port.
+		 */
+		in.s_addr = ntohl(np->in_inip);
+		if (!(nport = np->in_pnext))
+			nport = dport;
+
+		/*
+		 * When the redirect-to address is set to 0.0.0.0, just
+		 * assume a blank `forwarding' of the packet.  We don't
+		 * setup any translation for this either.
+		 */
+		if ((in.s_addr == 0) && (nport == dport)) {
+			KFREE(nat);
+			return NULL;
+		}
+
+		nat->nat_inip.s_addr = htonl(in.s_addr);
+		nat->nat_outip = ip->ip_dst;
+		nat->nat_oip = ip->ip_src;
+
+		sum1 = LONG_SUM(ntohl(ip->ip_dst.s_addr)) + ntohs(dport);
+		sum2 = LONG_SUM(in.s_addr) + ntohs(nport);
+
+		if (flags & IPN_TCPUDP) {
+			nat->nat_inport = nport;
+			nat->nat_outport = dport;
+			nat->nat_oport = sport;
+		}
+	}
+
+	CALC_SUMD(sum1, sum2, sumd);
+	nat->nat_sumd = (sumd & 0xffff) + (sumd >> 16);
+
+	if ((flags & IPN_TCPUDP) && ((sport != port) || (dport != nport))) {
+		if (direction == NAT_OUTBOUND)
+			sum1 = LONG_SUM(ntohl(ip->ip_src.s_addr));
+		else
+			sum1 = LONG_SUM(ntohl(ip->ip_dst.s_addr));
+
+		sum2 = LONG_SUM(in.s_addr);
+
+		CALC_SUMD(sum1, sum2, sumd);
+		nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16);
+	} else
+		nat->nat_ipsumd = nat->nat_sumd;
+
+	in.s_addr = htonl(in.s_addr);
+	nat->nat_next = nat_instances;
+	nat_instances = nat;
+	hv = NAT_HASH_FN(nat->nat_inip.s_addr, ipf_nattable_sz);
+	natp = &nat_table[0][hv];
+	nat->nat_hstart[0] = natp;
+	nat->nat_hnext[0] = *natp;
+	*natp = nat;
+	hv = NAT_HASH_FN(nat->nat_outip.s_addr, ipf_nattable_sz);
+	natp = &nat_table[1][hv];
+	nat->nat_hstart[1] = natp;
+	nat->nat_hnext[1] = *natp;
+	*natp = nat;
+	nat->nat_dir = direction;
+	nat->nat_ifp = fin->fin_ifp;
+	nat->nat_ptr = np;
+	nat->nat_p = ip->ip_p;
+	nat->nat_bytes = 0;
+	nat->nat_pkts = 0;
+	nat->nat_age = fr_defnatage;
+	nat->nat_fr = fin->fin_fr;
+	if (nat->nat_fr != NULL) {
+		ATOMIC_INC(nat->nat_fr->fr_ref);
+	}
+	if (direction == NAT_OUTBOUND) {
+		if (flags & IPN_TCPUDP)
+			tcp->th_sport = port;
+	} else {
+		if (flags & IPN_TCPUDP)
+			tcp->th_dport = nport;
+	}
+	nat_stats.ns_added++;
+	nat_stats.ns_inuse++;
+	np->in_use++;
+	return nat;
+}
+
+
+nat_t *nat_icmpinlookup(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	icmphdr_t *icmp;
+	tcphdr_t *tcp = NULL;
+	ip_t *oip;
+	int flags = 0, type;
+
+	icmp = (icmphdr_t *)fin->fin_dp;
+	/*
+	 * Does it at least have the return (basic) IP header ?
+	 * Only a basic IP header (no options) should be with an ICMP error
+	 * header.
+	 */
+	if ((ip->ip_hl != 5) || (ip->ip_len < ICMPERR_MINPKTLEN))
+		return NULL;
+	type = icmp->icmp_type;
+	/*
+	 * If it's not an error type, then return.
+	 */
+	if ((type != ICMP_UNREACH) && (type != ICMP_SOURCEQUENCH) &&
+	    (type != ICMP_REDIRECT) && (type != ICMP_TIMXCEED) &&
+	    (type != ICMP_PARAMPROB))
+		return NULL;
+
+	oip = (ip_t *)((char *)fin->fin_dp + 8);
+	if (ip->ip_len < ICMPERR_MAXPKTLEN + ((oip->ip_hl - 5) << 2))
+		return NULL;
+	if (oip->ip_p == IPPROTO_TCP)
+		flags = IPN_TCP;
+	else if (oip->ip_p == IPPROTO_UDP)
+		flags = IPN_UDP;
+	if (flags & IPN_TCPUDP) {
+		tcp = (tcphdr_t *)((char *)oip + (oip->ip_hl << 2));
+		return nat_inlookup(fin->fin_ifp, flags, (u_int)oip->ip_p,
+				    oip->ip_dst, oip->ip_src,
+				    (tcp->th_sport << 16) | tcp->th_dport);
+	}
+	return nat_inlookup(fin->fin_ifp, 0, (u_int)oip->ip_p, oip->ip_dst,
+			    oip->ip_src, 0);
+}
+
+
+/*
+ * This should *ONLY* be used for incoming packets to make sure a NAT'd ICMP
+ * packet gets correctly recognised.
+ */
+nat_t *nat_icmpin(ip, fin, nflags)
+ip_t *ip;
+fr_info_t *fin;
+u_int *nflags;
+{
+	u_32_t sum1, sum2, sumd;
+	struct in_addr in;
+	icmphdr_t *icmp;
+	nat_t *nat;
+	ip_t *oip;
+	int flags = 0;
+
+	if (!(nat = nat_icmpinlookup(ip, fin)))
+		return NULL;
+	*nflags = IPN_ICMPERR;
+	icmp = (icmphdr_t *)fin->fin_dp;
+	oip = (ip_t *)&icmp->icmp_ip;
+	if (oip->ip_p == IPPROTO_TCP)
+		flags = IPN_TCP;
+	else if (oip->ip_p == IPPROTO_UDP)
+		flags = IPN_UDP;
+	/*
+	 * Need to adjust ICMP header to include the real IP#'s and
+	 * port #'s.  Only apply a checksum change relative to the
+	 * IP address change is it will be modified again in ip_natout
+	 * for both address and port.  Two checksum changes are
+	 * necessary for the two header address changes.  Be careful
+	 * to only modify the checksum once for the port # and twice
+	 * for the IP#.
+	 */
+	if (nat->nat_dir == NAT_OUTBOUND) {
+		sum1 = LONG_SUM(ntohl(oip->ip_src.s_addr));
+		in = nat->nat_inip;
+		oip->ip_src = in;
+	} else {
+		sum1 = LONG_SUM(ntohl(oip->ip_dst.s_addr));
+		in = nat->nat_outip;
+		oip->ip_dst = in;
+	}
+
+	sum2 = LONG_SUM(ntohl(in.s_addr));
+
+	CALC_SUMD(sum1, sum2, sumd);
+
+	if (nat->nat_dir == NAT_OUTBOUND) {
+		fix_incksum(&oip->ip_sum, sumd);
+
+		sumd += (sumd & 0xffff);
+		while (sumd > 0xffff)
+			sumd = (sumd & 0xffff) + (sumd >> 16);
+		fix_outcksum(&icmp->icmp_cksum, sumd);
+	} else {
+		fix_outcksum(&oip->ip_sum, sumd);
+
+		sumd += (sumd & 0xffff);
+		while (sumd > 0xffff)
+			sumd = (sumd & 0xffff) + (sumd >> 16);
+		fix_incksum(&icmp->icmp_cksum, sumd);
+	}
+
+
+	if ((flags & IPN_TCPUDP) != 0) {
+		tcphdr_t *tcp;
+
+		/* XXX - what if this is bogus hl and we go off the end ? */
+		tcp = (tcphdr_t *)((((char *)oip) + (oip->ip_hl << 2)));
+
+		if (nat->nat_dir == NAT_OUTBOUND) {
+			if (tcp->th_sport != nat->nat_inport) {
+				sum1 = ntohs(tcp->th_sport);
+				sum2 = ntohs(nat->nat_inport);
+				CALC_SUMD(sum1, sum2, sumd);
+				tcp->th_sport = nat->nat_inport;
+				fix_outcksum(&icmp->icmp_cksum, sumd);
+			}
+		} else {
+			if (tcp->th_dport != nat->nat_outport) {
+				sum1 = ntohs(tcp->th_dport);
+				sum2 = ntohs(nat->nat_outport);
+				CALC_SUMD(sum1, sum2, sumd);
+				tcp->th_dport = nat->nat_outport;
+				fix_incksum(&icmp->icmp_cksum, sumd);
+			}
+		}
+	}
+	nat->nat_age = fr_defnaticmpage;
+	return nat;
+}
+
+
+/*
+ * NB: these lookups don't lock access to the list, it assume it has already
+ * been done!
+ */
+/*
+ * Lookup a nat entry based on the mapped destination ip address/port and
+ * real source address/port.  We use this lookup when receiving a packet,
+ * we're looking for a table entry, based on the destination address.
+ * NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
+ */
+nat_t *nat_inlookup(ifp, flags, p, src, mapdst, ports)
+void *ifp;
+register u_int flags, p;
+struct in_addr src , mapdst;
+u_32_t ports;
+{
+	register u_short sport, mapdport;
+	register nat_t *nat;
+	register int nflags;
+	u_int hv;
+
+	mapdport = ports >> 16;
+	sport = ports & 0xffff;
+	flags &= IPN_TCPUDP;
+
+	hv = NAT_HASH_FN(mapdst.s_addr, ipf_nattable_sz);
+	nat = nat_table[1][hv];
+	for (; nat; nat = nat->nat_hnext[1]) {
+		nflags = nat->nat_flags;
+		if ((!ifp || ifp == nat->nat_ifp) &&
+		    nat->nat_oip.s_addr == src.s_addr &&
+		    nat->nat_outip.s_addr == mapdst.s_addr &&
+		    (((p == 0) && (flags == (nat->nat_flags & IPN_TCPUDP)))
+		     || (p == nat->nat_p)) && (!flags ||
+		     (((nat->nat_oport == sport) || (nflags & FI_W_DPORT)) &&
+		      ((nat->nat_outport == mapdport) ||
+		       (nflags & FI_W_SPORT)))))
+			return nat;
+	}
+	return NULL;
+}
+
+
+/*
+ * Lookup a nat entry based on the source 'real' ip address/port and
+ * destination address/port.  We use this lookup when sending a packet out,
+ * we're looking for a table entry, based on the source address.
+ * NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
+ */
+nat_t *nat_outlookup(ifp, flags, p, src, dst, ports)
+void *ifp;
+register u_int flags, p;
+struct in_addr src , dst;
+u_32_t ports;
+{
+	register u_short sport, dport;
+	register nat_t *nat;
+	register int nflags;
+	u_int hv;
+
+	sport = ports & 0xffff;
+	dport = ports >> 16;
+	flags &= IPN_TCPUDP;
+
+	hv = NAT_HASH_FN(src.s_addr, ipf_nattable_sz);
+	nat = nat_table[0][hv];
+	for (; nat; nat = nat->nat_hnext[0]) {
+		nflags = nat->nat_flags;
+
+		if ((!ifp || ifp == nat->nat_ifp) &&
+		    nat->nat_inip.s_addr == src.s_addr &&
+		    nat->nat_oip.s_addr == dst.s_addr &&
+		    (((p == 0) && (flags == (nat->nat_flags & IPN_TCPUDP)))
+		     || (p == nat->nat_p)) && (!flags ||
+		     ((nat->nat_inport == sport || nflags & FI_W_SPORT) &&
+		      (nat->nat_oport == dport || nflags & FI_W_DPORT))))
+			return nat;
+	}
+	return NULL;
+}
+
+
+/*
+ * check if an ip address has already been allocated for a given mapping that
+ * is not doing port based translation.
+ */
+nat_t *nat_maplookup(ifp, flags, src, dst)
+void *ifp;
+register u_int flags;
+struct in_addr src , dst;
+{
+	register nat_t *nat;
+	register int oflags;
+	u_int hv;
+
+	hv = NAT_HASH_FN(src.s_addr, ipf_nattable_sz);
+	nat = nat_table[0][hv];
+	for (; nat; nat = nat->nat_hnext[0]) {
+		oflags = (flags & IPN_TCPUDP) & nat->nat_ptr->in_flags;
+		if (oflags != 0)
+			continue;
+
+		if ((!ifp || ifp == nat->nat_ifp) &&
+		    nat->nat_inip.s_addr == src.s_addr &&
+		    nat->nat_oip.s_addr == dst.s_addr)
+			return nat;
+	}
+	return NULL;
+}
+
+
+/*
+ * Lookup the NAT tables to search for a matching redirect
+ */
+nat_t *nat_lookupredir(np)
+register natlookup_t *np;
+{
+	u_32_t ports;
+	nat_t *nat;
+
+	ports = (np->nl_outport << 16) | np->nl_inport;
+	/*
+	 * If nl_inip is non null, this is a lookup based on the real
+	 * ip address. Else, we use the fake.
+	 */
+	if ((nat = nat_outlookup(NULL, np->nl_flags, 0, np->nl_inip,
+				 np->nl_outip, ports))) {
+		np->nl_realip = nat->nat_outip;
+		np->nl_realport = nat->nat_outport;
+	}
+	return nat;
+}
+
+
+/*
+ * Packets going out on the external interface go through this.
+ * Here, the source address requires alteration, if anything.
+ */
+int ip_natout(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	register ipnat_t *np = NULL;
+	register u_32_t ipa;
+	tcphdr_t *tcp = NULL;
+	u_short nflags = 0, sport = 0, dport = 0, *csump = NULL;
+	struct ifnet *ifp;
+	int natadd = 1;
+	frentry_t *fr;
+	u_int hv, msk;
+	u_32_t iph;
+	nat_t *nat;
+	int i;
+
+	if (nat_list == NULL)
+		return 0;
+
+	if ((fr = fin->fin_fr) && !(fr->fr_flags & FR_DUP) &&
+	    fr->fr_tif.fd_ifp && fr->fr_tif.fd_ifp != (void *)-1)
+		ifp = fr->fr_tif.fd_ifp;
+	else
+		ifp = fin->fin_ifp;
+
+	if (!(ip->ip_off & IP_OFFMASK) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
+		if (ip->ip_p == IPPROTO_TCP)
+			nflags = IPN_TCP;
+		else if (ip->ip_p == IPPROTO_UDP)
+			nflags = IPN_UDP;
+		if ((nflags & IPN_TCPUDP)) {
+			tcp = (tcphdr_t *)fin->fin_dp;
+			sport = tcp->th_sport;
+			dport = tcp->th_dport;
+		}
+	}
+
+	ipa = ip->ip_src.s_addr;
+
+	READ_ENTER(&ipf_nat);
+	if ((ip->ip_off & (IP_OFFMASK|IP_MF)) &&
+	    (nat = ipfr_nat_knownfrag(ip, fin)))
+		natadd = 0;
+	else if ((nat = nat_outlookup(ifp, nflags, (u_int)ip->ip_p, ip->ip_src,
+				      ip->ip_dst, (dport << 16) | sport))) {
+		nflags = nat->nat_flags;
+		if ((nflags & (FI_W_SPORT|FI_W_DPORT)) != 0) {
+			if ((nflags & FI_W_SPORT) &&
+			    (nat->nat_inport != sport))
+				nat->nat_inport = sport;
+			else if ((nflags & FI_W_DPORT) &&
+				 (nat->nat_oport != dport))
+				nat->nat_oport = dport;
+			if (nat->nat_outport == 0)
+				nat->nat_outport = sport;
+			nat->nat_flags &= ~(FI_W_DPORT|FI_W_SPORT);
+			nflags = nat->nat_flags;
+		}
+	} else {
+		RWLOCK_EXIT(&ipf_nat);
+		WRITE_ENTER(&ipf_nat);
+		/*
+		 * If there is no current entry in the nat table for this IP#,
+		 * create one for it (if there is a matching rule).
+		 */
+		msk = 0xffffffff;
+		i = 32;
+maskloop:
+		iph = ipa & htonl(msk);
+		hv = NAT_HASH_FN(iph, ipf_natrules_sz);
+		for (np = nat_rules[hv]; np; np = np->in_mnext)
+		{
+			if ((np->in_ifp == ifp) && np->in_space &&
+			    (!(np->in_flags & IPN_RF) ||
+			     (np->in_flags & nflags)) &&
+			    ((ipa & np->in_inmsk) == np->in_inip) &&
+			    ((np->in_redir & (NAT_MAP|NAT_MAPBLK)) ||
+			     (np->in_pnext == sport))) {
+				if (*np->in_plabel && !appr_ok(ip, tcp, np))
+					continue;
+				/*
+				 * If it's a redirection, then we don't want to
+				 * create new outgoing port stuff.
+				 * Redirections are only for incoming
+				 * connections.
+				 */
+				if (!(np->in_redir & (NAT_MAP|NAT_MAPBLK)))
+					continue;
+				if ((nat = nat_new(np, ip, fin, (u_int)nflags,
+						    NAT_OUTBOUND))) {
+					np->in_hits++;
+#ifdef	IPFILTER_LOG
+					nat_log(nat, (u_int)np->in_redir);
+#endif
+					break;
+				}
+			}
+		}
+		if ((np == NULL) && (i > 0)) {
+			do {
+				i--;
+				msk <<= 1;
+			} while ((i >= 0) && ((nat_masks & (1 << i)) == 0));
+			if (i >= 0)
+				goto maskloop;
+		}
+		MUTEX_DOWNGRADE(&ipf_nat);
+	}
+
+	if (nat) {
+		np = nat->nat_ptr;
+		if (natadd && fin->fin_fi.fi_fl & FI_FRAG)
+			ipfr_nat_newfrag(ip, fin, 0, nat);
+		ip->ip_src = nat->nat_outip;
+		MUTEX_ENTER(&ipf_rw);
+		nat->nat_age = fr_defnatage;
+		nat->nat_bytes += ip->ip_len;
+		nat->nat_pkts++;
+		MUTEX_EXIT(&ipf_rw);
+
+		/*
+		 * Fix up checksums, not by recalculating them, but
+		 * simply computing adjustments.
+		 */
+#if SOLARIS || defined(__sgi)
+		if (nat->nat_dir == NAT_OUTBOUND)
+			fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
+		else
+			fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
+#endif
+
+		if (!(ip->ip_off & IP_OFFMASK) &&
+		    !(fin->fin_fi.fi_fl & FI_SHORT)) {
+
+			if ((nat->nat_outport != 0) && (nflags & IPN_TCPUDP)) {
+				tcp->th_sport = nat->nat_outport;
+				fin->fin_data[0] = ntohs(tcp->th_sport);
+			}
+
+			if (ip->ip_p == IPPROTO_TCP) {
+				csump = &tcp->th_sum;
+				MUTEX_ENTER(&ipf_rw);
+				fr_tcp_age(&nat->nat_age,
+					   nat->nat_tcpstate, ip, fin, 1);
+				if (nat->nat_age < fr_defnaticmpage)
+					nat->nat_age = fr_defnaticmpage;
+#ifdef LARGE_NAT
+				else if (nat->nat_age > DEF_NAT_AGE)
+					nat->nat_age = DEF_NAT_AGE;
+#endif
+				/*
+				 * Increase this because we may have
+				 * "keep state" following this too and
+				 * packet storms can occur if this is
+				 * removed too quickly.
+				 */
+				if (nat->nat_age == fr_tcpclosed)
+					nat->nat_age = fr_tcplastack;
+				MUTEX_EXIT(&ipf_rw);
+			} else if (ip->ip_p == IPPROTO_UDP) {
+				udphdr_t *udp = (udphdr_t *)tcp;
+
+				if (udp->uh_sum)
+					csump = &udp->uh_sum;
+			}
+			if (csump) {
+				if (nat->nat_dir == NAT_OUTBOUND)
+					fix_outcksum(csump, nat->nat_sumd);
+				else
+					fix_incksum(csump, nat->nat_sumd);
+			}
+		}
+		if ((np->in_apr != NULL) && (np->in_dport == 0 ||
+		     (tcp != NULL && dport == np->in_dport)))
+			(void) appr_check(ip, fin, nat);
+		ATOMIC_INC(nat_stats.ns_mapped[1]);
+		RWLOCK_EXIT(&ipf_nat);	/* READ */
+		return 1;
+	}
+	RWLOCK_EXIT(&ipf_nat);			/* READ/WRITE */
+	return 0;
+}
+
+
+/*
+ * Packets coming in from the external interface go through this.
+ * Here, the destination address requires alteration, if anything.
+ */
+int ip_natin(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	register struct in_addr src;
+	register struct in_addr in;
+	register ipnat_t *np;
+	u_int nflags = 0, natadd = 1, hv, msk;
+	struct ifnet *ifp = fin->fin_ifp;
+	tcphdr_t *tcp = NULL;
+	u_short sport = 0, dport = 0, *csump = NULL;
+	nat_t *nat;
+	u_32_t iph;
+	int i;
+
+	if (nat_list == NULL)
+		return 0;
+
+	if (!(ip->ip_off & IP_OFFMASK) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
+		if (ip->ip_p == IPPROTO_TCP)
+			nflags = IPN_TCP;
+		else if (ip->ip_p == IPPROTO_UDP)
+			nflags = IPN_UDP;
+		if ((nflags & IPN_TCPUDP)) {
+			tcp = (tcphdr_t *)fin->fin_dp;
+			dport = tcp->th_dport;
+			sport = tcp->th_sport;
+		}
+	}
+
+	in = ip->ip_dst;
+	/* make sure the source address is to be redirected */
+	src = ip->ip_src;
+
+	READ_ENTER(&ipf_nat);
+
+	if ((ip->ip_p == IPPROTO_ICMP) && (nat = nat_icmpin(ip, fin, &nflags)))
+		;
+	else if ((ip->ip_off & IP_OFFMASK) &&
+		 (nat = ipfr_nat_knownfrag(ip, fin)))
+		natadd = 0;
+	else if ((nat = nat_inlookup(fin->fin_ifp, nflags, (u_int)ip->ip_p,
+				     ip->ip_src, in, (dport << 16) | sport))) {
+		nflags = nat->nat_flags;
+		if ((nflags & (FI_W_SPORT|FI_W_DPORT)) != 0) {
+			if ((nat->nat_oport != sport) && (nflags & FI_W_DPORT))
+				nat->nat_oport = sport;
+			else if ((nat->nat_outport != dport) &&
+				 (nflags & FI_W_SPORT))
+				nat->nat_outport = dport;
+			nat->nat_flags &= ~(FI_W_SPORT|FI_W_DPORT);
+			nflags = nat->nat_flags;
+		}
+	} else {
+		RWLOCK_EXIT(&ipf_nat);
+		WRITE_ENTER(&ipf_nat);
+		/*
+		 * If there is no current entry in the nat table for this IP#,
+		 * create one for it (if there is a matching rule).
+		 */
+		msk = 0xffffffff;
+		i = 32;
+maskloop:
+		iph = in.s_addr & htonl(msk);
+		hv = NAT_HASH_FN(iph, ipf_rdrrules_sz);
+		for (np = rdr_rules[hv]; np; np = np->in_rnext)
+			if ((np->in_ifp == ifp) &&
+			    (!np->in_flags || (nflags & np->in_flags)) &&
+			    ((in.s_addr & np->in_outmsk) == np->in_outip) &&
+			    ((src.s_addr & np->in_srcmsk) == np->in_srcip) &&
+			    (np->in_redir & NAT_REDIRECT) &&
+			     (!np->in_pmin || np->in_pmin == dport)) {
+				if ((nat = nat_new(np, ip, fin, nflags,
+						    NAT_INBOUND))) {
+					np->in_hits++;
+#ifdef	IPFILTER_LOG
+					nat_log(nat, (u_int)np->in_redir);
+#endif
+					break;
+				}
+			}
+		if ((np == NULL) && (i > 0)) {
+			do {
+				i--;
+				msk <<= 1;
+			} while ((i >= 0) && ((rdr_masks & (1 << i)) == 0));
+			if (i >= 0)
+				goto maskloop;
+		}
+		MUTEX_DOWNGRADE(&ipf_nat);
+	}
+	if (nat) {
+		np = nat->nat_ptr;
+		fin->fin_fr = nat->nat_fr;
+		if (natadd && fin->fin_fi.fi_fl & FI_FRAG)
+			ipfr_nat_newfrag(ip, fin, 0, nat);
+		if ((np->in_apr != NULL) && (np->in_dport == 0 ||
+		    (tcp != NULL && sport == np->in_dport)))
+			(void) appr_check(ip, fin, nat);
+
+		MUTEX_ENTER(&ipf_rw);
+		if (nflags != IPN_ICMPERR)
+			nat->nat_age = fr_defnatage;
+
+		nat->nat_bytes += ip->ip_len;
+		nat->nat_pkts++;
+		MUTEX_EXIT(&ipf_rw);
+		ip->ip_dst = nat->nat_inip;
+		fin->fin_fi.fi_dst = nat->nat_inip;
+
+		/*
+		 * Fix up checksums, not by recalculating them, but
+		 * simply computing adjustments.
+		 */
+#if SOLARIS || defined(__sgi)
+		if (nat->nat_dir == NAT_OUTBOUND)
+			fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
+		else
+			fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
+#endif
+		if (!(ip->ip_off & IP_OFFMASK) &&
+		    !(fin->fin_fi.fi_fl & FI_SHORT)) {
+
+			if ((nat->nat_inport != 0) && (nflags & IPN_TCPUDP)) {
+				tcp->th_dport = nat->nat_inport;
+				fin->fin_data[1] = ntohs(tcp->th_dport);
+			}
+
+			if (ip->ip_p == IPPROTO_TCP) {
+				csump = &tcp->th_sum;
+				MUTEX_ENTER(&ipf_rw);
+				fr_tcp_age(&nat->nat_age,
+					   nat->nat_tcpstate, ip, fin, 0);
+				if (nat->nat_age < fr_defnaticmpage)
+					nat->nat_age = fr_defnaticmpage;
+#ifdef LARGE_NAT
+				else if (nat->nat_age > DEF_NAT_AGE)
+					nat->nat_age = DEF_NAT_AGE;
+#endif
+				/*
+				 * Increase this because we may have
+				 * "keep state" following this too and
+				 * packet storms can occur if this is
+				 * removed too quickly.
+				 */
+				if (nat->nat_age == fr_tcpclosed)
+					nat->nat_age = fr_tcplastack;
+				MUTEX_EXIT(&ipf_rw);
+			} else if (ip->ip_p == IPPROTO_UDP) {
+				udphdr_t *udp = (udphdr_t *)tcp;
+
+				if (udp->uh_sum)
+					csump = &udp->uh_sum;
+			}
+			if (csump) {
+				if (nat->nat_dir == NAT_OUTBOUND)
+					fix_incksum(csump, nat->nat_sumd);
+				else
+					fix_outcksum(csump, nat->nat_sumd);
+			}
+		}
+		ATOMIC_INC(nat_stats.ns_mapped[0]);
+		RWLOCK_EXIT(&ipf_nat);			/* READ */
+		return 1;
+	}
+	RWLOCK_EXIT(&ipf_nat);			/* READ/WRITE */
+	return 0;
+}
+
+
+/*
+ * Free all memory used by NAT structures allocated at runtime.
+ */
+void ip_natunload()
+{
+	WRITE_ENTER(&ipf_nat);
+	(void) nat_clearlist();
+	(void) nat_flushtable();
+	RWLOCK_EXIT(&ipf_nat);
+
+	if (nat_table[0] != NULL) {
+		KFREES(nat_table[0], sizeof(nat_t *) * ipf_nattable_sz);
+		nat_table[0] = NULL;
+	}
+	if (nat_table[1] != NULL) {
+		KFREES(nat_table[1], sizeof(nat_t *) * ipf_nattable_sz);
+		nat_table[1] = NULL;
+	}
+	if (nat_rules != NULL) {
+		KFREES(nat_rules, sizeof(ipnat_t *) * ipf_natrules_sz);
+		nat_rules = NULL;
+	}
+	if (rdr_rules != NULL) {
+		KFREES(rdr_rules, sizeof(ipnat_t *) * ipf_rdrrules_sz);
+		rdr_rules = NULL;
+	}
+}
+
+
+/*
+ * Slowly expire held state for NAT entries.  Timeouts are set in
+ * expectation of this being called twice per second.
+ */
+void ip_natexpire()
+{
+	register struct nat *nat, **natp;
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_nat);
+	for (natp = &nat_instances; (nat = *natp); ) {
+		nat->nat_age--;
+		if (nat->nat_age) {
+			natp = &nat->nat_next;
+			continue;
+		}
+		*natp = nat->nat_next;
+#ifdef	IPFILTER_LOG
+		nat_log(nat, NL_EXPIRE);
+#endif
+		nat_delete(nat);
+		nat_stats.ns_expire++;
+	}
+	RWLOCK_EXIT(&ipf_nat);
+	SPL_X(s);
+}
+
+
+/*
+ */
+void ip_natsync(ifp)
+void *ifp;
+{
+	register ipnat_t *n;
+	register nat_t *nat;
+	register u_32_t sum1, sum2, sumd;
+	struct in_addr in;
+	ipnat_t *np;
+	void *ifp2;
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+
+	/*
+	 * Change IP addresses for NAT sessions for any protocol except TCP
+	 * since it will break the TCP connection anyway.
+	 */
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_nat);
+	for (nat = nat_instances; nat; nat = nat->nat_next)
+		if (((ifp == NULL) || (ifp == nat->nat_ifp)) &&
+		    !(nat->nat_flags & IPN_TCP) && (np = nat->nat_ptr) &&
+		    (np->in_outmsk == 0xffffffff) && !np->in_nip) {
+			ifp2 = nat->nat_ifp;
+			/*
+			 * Change the map-to address to be the same as the
+			 * new one.
+			 */
+			sum1 = nat->nat_outip.s_addr;
+			if (fr_ifpaddr(ifp2, &in) != -1)
+				nat->nat_outip.s_addr = htonl(in.s_addr);
+			sum2 = nat->nat_outip.s_addr;
+
+			if (sum1 == sum2)
+				continue;
+			/*
+			 * Readjust the checksum adjustment to take into
+			 * account the new IP#.
+			 */
+			CALC_SUMD(sum1, sum2, sumd);
+			sumd += nat->nat_sumd;
+			nat->nat_sumd = (sumd & 0xffff) + (sumd >> 16);
+		}
+
+	for (n = nat_list; (n != NULL); n = n->in_next)
+		if (n->in_ifp == ifp)
+			n->in_ifp = (void *)GETUNIT(n->in_ifname);
+	RWLOCK_EXIT(&ipf_nat);
+	SPL_X(s);
+}
+
+
+#ifdef	IPFILTER_LOG
+void nat_log(nat, type)
+struct nat *nat;
+u_int type;
+{
+	struct ipnat *np;
+	struct natlog natl;
+	void *items[1];
+	size_t sizes[1];
+	int rulen, types[1];
+
+	natl.nl_inip = nat->nat_inip;
+	natl.nl_outip = nat->nat_outip;
+	natl.nl_origip = nat->nat_oip;
+	natl.nl_bytes = nat->nat_bytes;
+	natl.nl_pkts = nat->nat_pkts;
+	natl.nl_origport = nat->nat_oport;
+	natl.nl_inport = nat->nat_inport;
+	natl.nl_outport = nat->nat_outport;
+	natl.nl_type = type;
+	natl.nl_rule = -1;
+#ifndef LARGE_NAT
+	if (nat->nat_ptr != NULL) {
+		for (rulen = 0, np = nat_list; np; np = np->in_next, rulen++)
+			if (np == nat->nat_ptr) {
+				natl.nl_rule = rulen;
+				break;
+			}
+	}
+#endif
+	items[0] = &natl;
+	sizes[0] = sizeof(natl);
+	types[0] = 0;
+
+	(void) ipllog(IPL_LOGNAT, NULL, items, sizes, types, 1);
+}
+#endif
diff --git a/sys/contrib/ipfilter/netinet/ip_nat.h b/sys/contrib/ipfilter/netinet/ip_nat.h
new file mode 100644
index 0000000..eeeebec
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_nat.h
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 1995-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_nat.h	1.5 2/4/96
+ * $Id: ip_nat.h,v 2.1.2.1 1999/08/14 04:47:54 darrenr Exp $
+ * $FreeBSD$
+ */
+
+#ifndef	__IP_NAT_H__
+#define	__IP_NAT_H__
+
+#ifndef SOLARIS
+#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(__STDC__) || defined(__GNUC__)
+#define	SIOCADNAT	_IOW('r', 80, struct ipnat)
+#define	SIOCRMNAT	_IOW('r', 81, struct ipnat)
+#define	SIOCGNATS	_IOR('r', 82, struct natstat)
+#define	SIOCGNATL	_IOWR('r', 83, struct natlookup)
+#define SIOCGFRST	_IOR('r', 84, struct ipfrstat)
+#define SIOCGIPST	_IOR('r', 85, struct ips_stat)
+#define	SIOCFLNAT	_IOWR('r', 86, int)
+#define	SIOCCNATL	_IOWR('r', 87, int)
+#else
+#define	SIOCADNAT	_IOW(r, 80, struct ipnat)
+#define	SIOCRMNAT	_IOW(r, 81, struct ipnat)
+#define	SIOCGNATS	_IOR(r, 82, struct natstat)
+#define	SIOCGNATL	_IOWR(r, 83, struct natlookup)
+#define SIOCGFRST	_IOR(r, 84, struct ipfrstat)
+#define SIOCGIPST	_IOR(r, 85, struct ips_stat)
+#define	SIOCFLNAT	_IOWR(r, 86, int)
+#define	SIOCCNATL	_IOWR(r, 87, int)
+#endif
+
+#undef	LARGE_NAT	/* define this if you're setting up a system to NAT
+			 * LARGE numbers of networks/hosts - i.e. in the
+			 * hundreds or thousands.  In such a case, you should
+			 * also change the RDR_SIZE and NAT_SIZE below to more
+			 * appropriate sizes.  The figures below were used for
+			 * a setup with 1000-2000 networks to NAT.
+			 */
+#define	NAT_SIZE	127
+#define	RDR_SIZE	127
+#define	NAT_TABLE_SZ	127
+#ifdef	LARGE_NAT
+#undef	NAT_SIZE
+#undef	RDR_SIZE
+#undef	NAT_TABLE_SZ
+#define	NAT_SIZE	2047
+#define	RDR_SIZE	2047
+#define	NAT_TABLE_SZ	16383
+#endif
+#ifndef	APR_LABELLEN
+#define	APR_LABELLEN	16
+#endif
+
+#define	DEF_NAT_AGE	1200     /* 10 minutes (600 seconds) */
+
+typedef	struct	nat	{
+	u_long	nat_age;
+	int	nat_flags;
+	u_32_t	nat_sumd;
+	u_32_t	nat_ipsumd;
+	void	*nat_data;
+	void	*nat_aps;		/* proxy session */
+	frentry_t	*nat_fr;	/* filter rule ptr if appropriate */
+	struct	in_addr	nat_inip;
+	struct	in_addr	nat_outip;
+	struct	in_addr	nat_oip;	/* other ip */
+	U_QUAD_T	nat_pkts;
+	U_QUAD_T	nat_bytes;
+	u_short	nat_oport;		/* other port */
+	u_short	nat_inport;
+	u_short	nat_outport;
+	u_short	nat_use;
+	u_char	nat_tcpstate[2];
+	u_char	nat_p;			/* protocol for NAT */
+	struct	ipnat	*nat_ptr;	/* pointer back to the rule */
+	struct	nat	*nat_next;
+	struct	nat	*nat_hnext[2];
+	struct	nat	**nat_hstart[2];
+	void	*nat_ifp;
+	int	nat_dir;
+} nat_t;
+
+typedef	struct	ipnat	{
+	struct	ipnat	*in_next;
+	struct	ipnat	*in_rnext;
+	struct	ipnat	*in_mnext;
+	void	*in_ifp;
+	void	*in_apr;
+	u_long	in_space;
+	u_int	in_use;
+	u_int	in_hits;
+	struct	in_addr	in_nextip;
+	u_short	in_pnext;
+	u_short	in_ppip;	/* ports per IP */
+	u_short	in_ippip;	/* IP #'s per IP# */
+	u_short	in_flags;	/* From here to in_dport must be reflected */
+	u_short	in_port[2];	/* correctly in IPN_CMPSIZ */
+	struct	in_addr	in_in[2];
+	struct	in_addr	in_out[2];
+	struct	in_addr	in_src[2];
+	int	in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
+	char	in_ifname[IFNAMSIZ];
+	char	in_plabel[APR_LABELLEN];	/* proxy label */
+	char	in_p;	/* protocol */
+	u_short	in_dport;
+} ipnat_t;
+
+#define	in_pmin		in_port[0]	/* Also holds static redir port */
+#define	in_pmax		in_port[1]
+#define	in_nip		in_nextip.s_addr
+#define	in_inip		in_in[0].s_addr
+#define	in_inmsk	in_in[1].s_addr
+#define	in_outip	in_out[0].s_addr
+#define	in_outmsk	in_out[1].s_addr
+#define	in_srcip	in_src[0].s_addr
+#define	in_srcmsk	in_src[1].s_addr
+
+#define	NAT_OUTBOUND	0
+#define	NAT_INBOUND	1
+
+#define	NAT_MAP		0x01
+#define	NAT_REDIRECT	0x02
+#define	NAT_BIMAP	(NAT_MAP|NAT_REDIRECT)
+#define	NAT_MAPBLK	0x04
+
+#define	MAPBLK_MINPORT	1024	/* don't use reserved ports for src port */
+#define	USABLE_PORTS	(65536 - MAPBLK_MINPORT)
+
+#define	IPN_CMPSIZ	(sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
+
+typedef	struct	natlookup {
+	struct	in_addr	nl_inip;
+	struct	in_addr	nl_outip;
+	struct	in_addr	nl_realip;
+	int	nl_flags;
+	u_short	nl_inport;
+	u_short	nl_outport;
+	u_short	nl_realport;
+} natlookup_t;
+
+typedef	struct	natstat	{
+	u_long	ns_mapped[2];
+	u_long	ns_rules;
+	u_long	ns_added;
+	u_long	ns_expire;
+	u_long	ns_inuse;
+	u_long	ns_logged;
+	u_long	ns_logfail;
+	nat_t	**ns_table[2];
+	ipnat_t	*ns_list;
+	void	*ns_apslist;
+	u_int	ns_nattab_sz;
+	u_int	ns_rultab_sz;
+	u_int	ns_rdrtab_sz;
+	nat_t	*ns_instances;
+} natstat_t;
+
+#define	IPN_ANY		0x00
+#define	IPN_TCP		0x01
+#define	IPN_UDP		0x02
+#define	IPN_TCPUDP	(IPN_TCP|IPN_UDP)
+#define	IPN_DELETE	0x04
+#define	IPN_ICMPERR	0x08
+#define	IPN_RF		(IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
+#define	IPN_AUTOPORTMAP	0x10
+#define	IPN_RANGE	0x20
+#define	IPN_USERFLAGS	(IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_RANGE)
+
+
+typedef	struct	natlog {
+	struct	in_addr	nl_origip;
+	struct	in_addr	nl_outip;
+	struct	in_addr	nl_inip;
+	u_short	nl_origport;
+	u_short	nl_outport;
+	u_short	nl_inport;
+	u_short	nl_type;
+	int	nl_rule;
+	U_QUAD_T	nl_pkts;
+	U_QUAD_T	nl_bytes;
+} natlog_t;
+
+
+#define	NL_NEWMAP	NAT_MAP
+#define	NL_NEWRDR	NAT_REDIRECT
+#define	NL_EXPIRE	0xffff
+
+#define	NAT_HASH_FN(k,m)	(((k) + ((k) >> 12)) % (m))
+
+#define	LONG_SUM(in)	(((in) & 0xffff) + ((in) >> 16))
+
+#define	CALC_SUMD(s1, s2, sd) { \
+			    (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
+			    (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
+			    /* Do it twice */ \
+			    (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
+			    (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
+			    /* Because ~1 == -2, We really need ~1 == -1 */ \
+			    if ((s1) > (s2)) (s2)--; \
+			    (sd) = (s2) - (s1); \
+			    (sd) = ((sd) & 0xffff) + ((sd) >> 16); }
+
+
+extern	u_int	ipf_nattable_sz;
+extern	u_int	ipf_natrules_sz;
+extern	u_int	ipf_rdrrules_sz;
+extern	void	ip_natsync __P((void *));
+extern	u_long	fr_defnatage;
+extern	u_long	fr_defnaticmpage;
+extern	nat_t	**nat_table[2];
+extern	nat_t	*nat_instances;
+extern	ipnat_t	**nat_rules;
+extern	ipnat_t	**rdr_rules;
+extern	natstat_t	nat_stats;
+#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
+extern	int	nat_ioctl __P((caddr_t, u_long, int));
+#else
+extern	int	nat_ioctl __P((caddr_t, int, int));
+#endif
+extern	int	nat_init __P((void));
+extern	nat_t	*nat_new __P((ipnat_t *, ip_t *, fr_info_t *, u_int, int));
+extern	nat_t	*nat_outlookup __P((void *, u_int, u_int, struct in_addr,
+				 struct in_addr, u_32_t));
+extern	nat_t	*nat_inlookup __P((void *, u_int, u_int, struct in_addr,
+				struct in_addr, u_32_t));
+extern	nat_t	*nat_maplookup __P((void *, u_int, struct in_addr,
+				struct in_addr));
+extern	nat_t	*nat_lookupredir __P((natlookup_t *));
+extern	nat_t	*nat_icmpinlookup __P((ip_t *, fr_info_t *));
+extern	nat_t	*nat_icmpin __P((ip_t *, fr_info_t *, u_int *));
+
+extern	int	ip_natout __P((ip_t *, fr_info_t *));
+extern	int	ip_natin __P((ip_t *, fr_info_t *));
+extern	void	ip_natunload __P((void)), ip_natexpire __P((void));
+extern	void	nat_log __P((struct nat *, u_int));
+extern	void	fix_incksum __P((u_short *, u_32_t));
+extern	void	fix_outcksum __P((u_short *, u_32_t));
+
+#endif /* __IP_NAT_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_proxy.c b/sys/contrib/ipfilter/netinet/ip_proxy.c
new file mode 100644
index 0000000..3a03863
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_proxy.c
@@ -0,0 +1,388 @@
+/*
+ * Copyright (C) 1997-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+/*static const char rcsid[] = "@(#)$Id: ip_proxy.c,v 2.2.2.1 1999/09/19 12:18:19 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#if defined(__FreeBSD__) && defined(KERNEL) && !defined(_KERNEL)
+# define	_KERNEL
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/file.h>
+#if !defined(__FreeBSD_version)  
+# include <sys/ioctl.h>      
+#endif
+#include <sys/fcntl.h>
+#include <sys/uio.h>
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+#endif
+#ifndef	linux
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(_KERNEL)
+# if !defined(linux)
+#  include <sys/systm.h>
+# else
+#  include <linux/string.h>
+# endif
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+#  include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+#if __FreeBSD__ > 2
+# include <sys/queue.h>
+#endif
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#ifndef linux
+# include <netinet/ip_var.h>
+#endif
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_state.h"
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+#endif
+
+
+#ifndef MIN
+#define MIN(a,b)        (((a)<(b))?(a):(b))
+#endif
+
+static ap_session_t *appr_new_session __P((aproxy_t *, ip_t *,
+					   fr_info_t *, nat_t *));
+static int appr_fixseqack __P((fr_info_t *, ip_t *, ap_session_t *, int ));
+
+
+#define	AP_SESS_SIZE	53
+
+#if defined(_KERNEL) && !defined(linux)
+#include "netinet/ip_ftp_pxy.c"
+#include "netinet/ip_rcmd_pxy.c"
+#include "netinet/ip_raudio_pxy.c"
+#endif
+
+ap_session_t	*ap_sess_tab[AP_SESS_SIZE];
+ap_session_t	*ap_sess_list = NULL;
+aproxy_t	ap_proxies[] = {
+#ifdef	IPF_FTP_PROXY
+	{ "ftp", (char)IPPROTO_TCP, 0, 0, ippr_ftp_init, NULL,
+	  ippr_ftp_in, ippr_ftp_out },
+#endif
+#ifdef	IPF_RCMD_PROXY
+	{ "rcmd", (char)IPPROTO_TCP, 0, 0, ippr_rcmd_init, ippr_rcmd_new,
+	  NULL, ippr_rcmd_out },
+#endif
+#ifdef	IPF_RAUDIO_PROXY
+	{ "raudio", (char)IPPROTO_TCP, 0, 0, ippr_raudio_init,
+	  ippr_raudio_new, ippr_raudio_in, ippr_raudio_out },
+#endif
+	{ "", '\0', 0, 0, NULL, NULL }
+};
+
+
+int appr_ok(ip, tcp, nat)
+ip_t *ip;
+tcphdr_t *tcp;
+ipnat_t *nat;
+{
+	aproxy_t *apr = nat->in_apr;
+	u_short dport = nat->in_dport;
+
+	if (!apr || (apr->apr_flags & APR_DELETE) ||
+	    (ip->ip_p != apr->apr_p))
+		return 0;
+	if ((tcp && (tcp->th_dport != dport)) || (!tcp && dport))
+		return 0;
+	return 1;
+}
+
+
+/*
+ * Allocate a new application proxy structure and fill it in with the
+ * relevant details.  call the init function once complete, prior to
+ * returning.
+ */
+static ap_session_t *appr_new_session(apr, ip, fin, nat)
+aproxy_t *apr;
+ip_t *ip;
+fr_info_t *fin;
+nat_t *nat;
+{
+	register ap_session_t *aps;
+
+	if (!apr || (apr->apr_flags & APR_DELETE) || (ip->ip_p != apr->apr_p))
+		return NULL;
+
+	KMALLOC(aps, ap_session_t *);
+	if (!aps)
+		return NULL;
+	bzero((char *)aps, sizeof(*aps));
+	aps->aps_next = ap_sess_list;
+	aps->aps_p = ip->ip_p;
+	aps->aps_data = NULL;
+	aps->aps_apr = apr;
+	aps->aps_psiz = 0;
+	ap_sess_list = aps;
+	aps->aps_nat = nat;
+	nat->nat_aps = aps;
+	if (apr->apr_new != NULL)
+		(void) (*apr->apr_new)(fin, ip, aps, nat);
+	return aps;
+}
+
+
+/*
+ * check to see if a packet should be passed through an active proxy routine
+ * if one has been setup for it.
+ */
+int appr_check(ip, fin, nat)
+ip_t *ip;
+fr_info_t *fin;
+nat_t *nat;
+{
+	ap_session_t *aps;
+	aproxy_t *apr;
+	tcphdr_t *tcp = NULL;
+	u_32_t sum;
+	int err;
+
+	if (nat->nat_aps == NULL)
+		nat->nat_aps = appr_new_session(nat->nat_ptr->in_apr, ip,
+						fin, nat);
+	aps = nat->nat_aps;
+	if ((aps != NULL) && (aps->aps_p == ip->ip_p)) {
+		if (ip->ip_p == IPPROTO_TCP) {
+			tcp = (tcphdr_t *)fin->fin_dp;
+			/*
+			 * verify that the checksum is correct.  If not, then
+			 * don't do anything with this packet.
+			 */
+#if SOLARIS && defined(_KERNEL)
+			sum = fr_tcpsum(fin->fin_qfm, ip, tcp);
+#else
+			sum = fr_tcpsum(*(mb_t **)fin->fin_mp, ip, tcp);
+#endif
+			if (sum != tcp->th_sum) {
+				frstats[fin->fin_out].fr_tcpbad++;
+				return -1;
+			}
+		}
+
+		apr = aps->aps_apr;
+		err = 0;
+		if (fin->fin_out != 0) {
+			if (apr->apr_outpkt != NULL)
+				err = (*apr->apr_outpkt)(fin, ip, aps, nat);
+		} else {
+			if (apr->apr_inpkt != NULL)
+				err = (*apr->apr_inpkt)(fin, ip, aps, nat);
+		}
+
+		if (tcp != NULL) {
+			err = appr_fixseqack(fin, ip, aps, err);
+#if SOLARIS && defined(_KERNEL)
+			tcp->th_sum = fr_tcpsum(fin->fin_qfm, ip, tcp);
+#else
+			tcp->th_sum = fr_tcpsum(*(mb_t **)fin->fin_mp, ip, tcp);
+#endif
+		}
+		aps->aps_bytes += ip->ip_len;
+		aps->aps_pkts++;
+		return 2;
+	}
+	return -1;
+}
+
+
+aproxy_t *appr_match(pr, name)
+u_int pr;
+char *name;
+{
+	aproxy_t *ap;
+
+	for (ap = ap_proxies; ap->apr_p; ap++)
+		if ((ap->apr_p == pr) &&
+		    !strncmp(name, ap->apr_label, sizeof(ap->apr_label))) {
+			ap->apr_ref++;
+			return ap;
+		}
+	return NULL;
+}
+
+
+void appr_free(ap)
+aproxy_t *ap;
+{
+	ap->apr_ref--;
+}
+
+
+void aps_free(aps)
+ap_session_t *aps;
+{
+	ap_session_t *a, **ap;
+
+	if (!aps)
+		return;
+
+	for (ap = &ap_sess_list; (a = *ap); ap = &a->aps_next)
+		if (a == aps) {
+			*ap = a->aps_next;
+			break;
+		}
+
+	if (a) {
+		if ((aps->aps_data != NULL) && (aps->aps_psiz != 0))
+			KFREES(aps->aps_data, aps->aps_psiz);
+		KFREE(aps);
+	}
+}
+
+
+static int appr_fixseqack(fin, ip, aps, inc)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+int inc;
+{
+	int sel, ch = 0, out, nlen;
+	u_32_t seq1, seq2;
+	tcphdr_t *tcp;
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	out = fin->fin_out;
+	nlen = ip->ip_len;
+	nlen -= (ip->ip_hl << 2) + (tcp->th_off << 2);
+
+	if (out != 0) {
+		seq1 = (u_32_t)ntohl(tcp->th_seq);
+		sel = aps->aps_sel[out];
+
+		/* switch to other set ? */
+		if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
+		    (seq1 > aps->aps_seqmin[!sel]))
+			sel = aps->aps_sel[out] = !sel;
+
+		if (aps->aps_seqoff[sel]) {
+			seq2 = aps->aps_seqmin[sel] - aps->aps_seqoff[sel];
+			if (seq1 > seq2) {
+				seq2 = aps->aps_seqoff[sel];
+				seq1 += seq2;
+				tcp->th_seq = htonl(seq1);
+				ch = 1;
+			}
+		}
+
+		if (inc && (seq1 > aps->aps_seqmin[!sel])) {
+			aps->aps_seqmin[!sel] = seq1 + nlen - 1;
+			aps->aps_seqoff[!sel] = aps->aps_seqoff[sel] + inc;
+		}
+
+		/***/
+
+		seq1 = ntohl(tcp->th_ack);
+		sel = aps->aps_sel[1 - out];
+
+		/* switch to other set ? */
+		if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
+		    (seq1 > aps->aps_ackmin[!sel]))
+			sel = aps->aps_sel[1 - out] = !sel;
+
+		if (aps->aps_ackoff[sel] && (seq1 > aps->aps_ackmin[sel])) {
+			seq2 = aps->aps_ackoff[sel];
+			tcp->th_ack = htonl(seq1 - seq2);
+			ch = 1;
+		}
+	} else {
+		seq1 = ntohl(tcp->th_seq);
+		sel = aps->aps_sel[out];
+
+		/* switch to other set ? */
+		if ((aps->aps_ackmin[!sel] > aps->aps_ackmin[sel]) &&
+		    (seq1 > aps->aps_ackmin[!sel]))
+			sel = aps->aps_sel[out] = !sel;
+
+		if (aps->aps_ackoff[sel]) {
+			seq2 = aps->aps_ackmin[sel] -
+			       aps->aps_ackoff[sel];
+			if (seq1 > seq2) {
+				seq2 = aps->aps_ackoff[sel];
+				seq1 += seq2;
+				tcp->th_seq = htonl(seq1);
+				ch = 1;
+			}
+		}
+
+		if (inc && (seq1 > aps->aps_ackmin[!sel])) {
+			aps->aps_ackmin[!sel] = seq1 + nlen - 1;
+			aps->aps_ackoff[!sel] = aps->aps_ackoff[sel] + inc;
+		}
+
+		/***/
+
+		seq1 = ntohl(tcp->th_ack);
+		sel = aps->aps_sel[1 - out];
+
+		/* switch to other set ? */
+		if ((aps->aps_seqmin[!sel] > aps->aps_seqmin[sel]) &&
+		    (seq1 > aps->aps_seqmin[!sel]))
+			sel = aps->aps_sel[1 - out] = !sel;
+
+		if (aps->aps_seqoff[sel] && (seq1 > aps->aps_seqmin[sel])) {
+			seq2 = aps->aps_seqoff[sel];
+			tcp->th_ack = htonl(seq1 - seq2);
+			ch = 1;
+		}
+	}
+	return ch ? 2 : 0;
+}
+
+
+int appr_init()
+{
+	aproxy_t *ap;
+	int err = 0;
+
+	for (ap = ap_proxies; ap->apr_p; ap++) {
+		err = (*ap->apr_init)();
+		if (err != 0)
+			break;
+	}
+	return err;
+}
diff --git a/sys/contrib/ipfilter/netinet/ip_proxy.h b/sys/contrib/ipfilter/netinet/ip_proxy.h
new file mode 100644
index 0000000..9ccd46a
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_proxy.h
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 1997-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * $Id: ip_proxy.h,v 2.1.2.1 1999/09/19 12:18:20 darrenr Exp $
+ * $FreeBSD$
+ */
+
+#ifndef	__IP_PROXY_H__
+#define	__IP_PROXY_H__
+
+#ifndef SOLARIS
+#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#ifndef	APR_LABELLEN
+#define	APR_LABELLEN	16
+#endif
+#define	AP_SESS_SIZE	53
+
+struct	nat;
+struct	ipnat;
+
+typedef	struct	ap_tcp {
+	u_short	apt_sport;	/* source port */
+	u_short	apt_dport;	/* destination port */
+	short	apt_sel[2];	/* {seq,ack}{off,min} set selector */
+	short	apt_seqoff[2];	/* sequence # difference */
+	tcp_seq	apt_seqmin[2];	/* don't change seq-off until after this */
+	short	apt_ackoff[2];	/* sequence # difference */
+	tcp_seq	apt_ackmin[2];	/* don't change seq-off until after this */
+	u_char	apt_state[2];	/* connection state */
+} ap_tcp_t;
+
+typedef	struct	ap_udp {
+	u_short	apu_sport;	/* source port */
+	u_short	apu_dport;	/* destination port */
+} ap_udp_t;
+
+typedef	struct ap_session {
+	struct	aproxy	*aps_apr;
+	union {
+		struct	ap_tcp	apu_tcp;
+		struct	ap_udp	apu_udp;
+	} aps_un;
+	u_int	aps_flags;
+	U_QUAD_T aps_bytes;	/* bytes sent */
+	U_QUAD_T aps_pkts;	/* packets sent */
+	void	*aps_nat;	/* pointer back to nat struct */
+	void	*aps_data;	/* private data */
+	int	aps_p;		/* protocol */
+	int	aps_psiz;	/* size of private data */
+	struct	ap_session	*aps_hnext;
+	struct	ap_session	*aps_next;
+} ap_session_t ;
+
+#define	aps_sport	aps_un.apu_tcp.apt_sport
+#define	aps_dport	aps_un.apu_tcp.apt_dport
+#define	aps_sel		aps_un.apu_tcp.apt_sel
+#define	aps_seqoff	aps_un.apu_tcp.apt_seqoff
+#define	aps_seqmin	aps_un.apu_tcp.apt_seqmin
+#define	aps_state	aps_un.apu_tcp.apt_state
+#define	aps_ackoff	aps_un.apu_tcp.apt_ackoff
+#define	aps_ackmin	aps_un.apu_tcp.apt_ackmin
+
+
+typedef	struct	aproxy	{
+	char	apr_label[APR_LABELLEN];	/* Proxy label # */
+	u_char	apr_p;		/* protocol */
+	int	apr_ref;	/* +1 per rule referencing it */
+	int	apr_flags;
+	int	(* apr_init) __P((void));
+	int	(* apr_new) __P((fr_info_t *, ip_t *,
+				 ap_session_t *, struct nat *));
+	int	(* apr_inpkt) __P((fr_info_t *, ip_t *,
+				   ap_session_t *, struct nat *));
+	int	(* apr_outpkt) __P((fr_info_t *, ip_t *,
+				    ap_session_t *, struct nat *));
+} aproxy_t;
+
+#define	APR_DELETE	1
+
+
+/*
+ * Real audio proxy structure and #defines
+ */
+typedef	struct	{
+	int	rap_seenpna;
+	int	rap_seenver;
+	int	rap_version;
+	int	rap_eos;	/* End Of Startup */
+	int	rap_gotid;
+	int	rap_gotlen;
+	int	rap_mode;
+	int	rap_sdone;
+	u_short	rap_plport;
+	u_short	rap_prport;
+	u_short	rap_srport;
+	char	rap_svr[19];
+	u_32_t	rap_sbf;	/* flag to indicate which of the 19 bytes have
+				 * been filled
+				 */
+	tcp_seq	rap_sseq;
+} raudio_t;
+
+#define	RA_ID_END	0
+#define	RA_ID_UDP	1
+#define	RA_ID_ROBUST	7
+
+#define	RAP_M_UDP	1
+#define	RAP_M_ROBUST	2
+#define	RAP_M_TCP	4
+#define	RAP_M_UDP_ROBUST	(RAP_M_UDP|RAP_M_ROBUST)
+
+
+extern	ap_session_t	*ap_sess_tab[AP_SESS_SIZE];
+extern	ap_session_t	*ap_sess_list;
+extern	aproxy_t	ap_proxies[];
+
+extern	int	appr_init __P((void));
+extern	int	appr_ok __P((ip_t *, tcphdr_t *, struct ipnat *));
+extern	void	appr_free __P((aproxy_t *));
+extern	void	aps_free __P((ap_session_t *));
+extern	int	appr_check __P((ip_t *, fr_info_t *, struct nat *));
+extern	aproxy_t	*appr_match __P((u_int, char *));
+
+#endif /* __IP_PROXY_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ip_raudio_pxy.c b/sys/contrib/ipfilter/netinet/ip_raudio_pxy.c
new file mode 100644
index 0000000..b76eea5
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_raudio_pxy.c
@@ -0,0 +1,274 @@
+/*
+ * $Id$
+ * $FreeBSD$
+ */
+#if SOLARIS && defined(_KERNEL)
+extern	kmutex_t	ipf_rw;
+#endif
+
+#define	IPF_RAUDIO_PROXY
+
+
+int ippr_raudio_init __P((void));
+int ippr_raudio_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_raudio_in __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_raudio_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+
+static	frentry_t	raudiofr;
+
+
+/*
+ * Real Audio application proxy initialization.
+ */
+int ippr_raudio_init()
+{
+	bzero((char *)&raudiofr, sizeof(raudiofr));
+	raudiofr.fr_ref = 1;
+	raudiofr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
+	return 0;
+}
+
+
+/*
+ * Setup for a new proxy to handle Real Audio.
+ */
+int ippr_raudio_new(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	raudio_t *rap;
+
+
+	KMALLOCS(aps->aps_data, void *, sizeof(raudio_t));
+	if (aps->aps_data != NULL) {
+		bzero(aps->aps_data, sizeof(raudio_t));
+		rap = aps->aps_data;
+		aps->aps_psiz = sizeof(raudio_t);
+		rap->rap_mode = RAP_M_TCP;	/* default is for TCP */
+	}
+	return 0;
+}
+
+
+
+int ippr_raudio_out(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	char membuf[512 + 1], *s;
+	int off, dlen, inc = 0;
+	tcphdr_t *tcp, tcph, *tcp2 = &tcph;
+	raudio_t *rap = aps->aps_data;
+	u_short sp, dp, id = 0;
+	struct in_addr swip;
+	fr_info_t fi;
+	int len = 0;
+	nat_t *ipn;
+	mb_t *m;
+#if	SOLARIS
+	mb_t *m1;
+#endif
+
+	/*
+	 * If we've already processed the start messages, then nothing left
+	 * for the proxy to do.
+	 */
+	if (rap->rap_eos == 1)
+		return 0;
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	off = (ip->ip_hl << 2) + (tcp->th_off << 2);
+	bzero(membuf, sizeof(membuf));
+#if	SOLARIS
+	m = fin->fin_qfm;
+
+	dlen = msgdsize(m) - off;
+	if (dlen <= 0)
+		return 0;
+	copyout_mblk(m, off, MIN(sizeof(membuf), dlen), membuf);
+#else
+	m = *(mb_t **)fin->fin_mp;
+
+	dlen = mbufchainlen(m) - off;
+	if (dlen <= 0)
+		return 0;
+	m_copydata(m, off, MIN(sizeof(membuf), dlen), membuf);
+#endif
+	/*
+	 * In all the startup parsing, ensure that we don't go outside
+	 * the packet buffer boundary.
+	 */
+	/*
+	 * Look for the start of connection "PNA" string if not seen yet.
+	 */
+	if (rap->rap_seenpna == 0) {
+		s = memstr("PNA", membuf, 3, dlen);
+		if (s == NULL)
+			return 0;
+		s += 3;
+		rap->rap_seenpna = 1;
+	} else
+		s = membuf;
+
+	/*
+	 * Directly after the PNA will be the version number of this
+	 * connection.
+	 */
+	if (rap->rap_seenpna == 1 && rap->rap_seenver == 0) {
+		if ((s + 1) - membuf < dlen) {
+			rap->rap_version = (*s << 8) | *(s + 1);
+			s += 2;
+			rap->rap_seenver = 1;
+		} else
+			return 0;
+	}
+
+	/*
+	 * Now that we've been past the PNA and version number, we're into the
+	 * startup messages block.  This ends when a message with an ID of 0.
+	 */
+	while ((rap->rap_eos == 0) && ((s + 1) - membuf < dlen)) {
+		if (rap->rap_gotid == 0) {
+			id = (*s << 8) | *(s + 1);
+			s += 2;
+			rap->rap_gotid = 1;
+			if (id == RA_ID_END) {
+				rap->rap_eos = 1;
+				break;
+			}
+		} else if (rap->rap_gotlen == 0) {
+			len = (*s << 8) | *(s + 1);
+			s += 2;
+			rap->rap_gotlen = 1;
+		}
+
+		if (rap->rap_gotid == 1 && rap->rap_gotlen == 1) {
+			if (id == RA_ID_UDP) {
+				rap->rap_mode &= ~RAP_M_TCP;
+				rap->rap_mode |= RAP_M_UDP;
+				rap->rap_plport = (*s << 8) | *(s + 1);
+			} else if (id == RA_ID_ROBUST) {
+				rap->rap_mode |= RAP_M_ROBUST;
+				rap->rap_prport = (*s << 8) | *(s + 1);
+			}
+			s += len;
+			rap->rap_gotlen = 0;
+			rap->rap_gotid = 0;
+		}
+	}
+
+	/*
+	 * Wait until we've seen the end of the start messages and even then
+	 * only proceed further if we're using UDP.
+	 */
+	if ((rap->rap_eos == 0) || ((rap->rap_mode & RAP_M_UDP) != RAP_M_UDP))
+		return 0;
+	sp = rap->rap_plport;
+	dp = 0;
+
+	bcopy((char *)fin, (char *)&fi, sizeof(fi));
+	bzero((char *)tcp2, sizeof(*tcp2));
+	tcp2->th_sport = htons(sp);
+	tcp2->th_dport = 0; /* XXX - don't specify remote port */
+	tcp2->th_win = htons(8192);
+	fi.fin_dp = (char *)tcp2;
+	fi.fin_data[0] = sp;
+	fi.fin_data[1] = 0;
+	fi.fin_fr = &raudiofr;
+	swip = ip->ip_src;
+	ip->ip_src = nat->nat_inip;
+	ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_DPORT, NAT_OUTBOUND);
+	if (ipn != NULL) {
+		ipn->nat_age = fr_defnatage;
+		(void) fr_addstate(ip, &fi, FI_W_DPORT);
+	}
+	ip->ip_src = swip;
+
+	if ((rap->rap_mode & RAP_M_UDP_ROBUST) == RAP_M_UDP_ROBUST) {
+		sp = rap->rap_prport;
+	}
+	return inc;
+}
+
+
+int ippr_raudio_in(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	char membuf[IPF_MAXPORTLEN + 1], *s;
+	int off, dlen;
+	raudio_t *rap = aps->aps_data;
+	u_int a1, a2, a3, a4;
+	tcphdr_t *tcp;
+	tcp_seq seq;
+	mb_t *m;
+#if	SOLARIS
+	mb_t *m1;
+#endif
+
+	if ((rap->rap_sdone != 0) ||
+	    ((rap->rap_mode & RAP_M_UDP_ROBUST) != RAP_M_UDP_ROBUST))
+		return 0;
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	off = (ip->ip_hl << 2) + (tcp->th_off << 2);
+	m = *(mb_t **)fin->fin_mp;
+
+#if	SOLARIS
+	m = fin->fin_qfm;
+
+	dlen = msgdsize(m) - off;
+	if (dlen <= 0)
+		return 0;
+	bzero(membuf, sizeof(membuf));
+	copyout_mblk(m, off, MIN(sizeof(membuf), dlen), membuf);
+#else
+	dlen = mbufchainlen(m) - off;
+	if (dlen <= 0)
+		return 0;
+	bzero(membuf, sizeof(membuf));
+	m_copydata(m, off, MIN(sizeof(membuf), dlen), membuf);
+#endif
+
+	seq = ntohl(tcp->th_seq);
+	/*
+	 * Check to see if the data in this packet is of interest to us.
+	 * We only care for the first 19 bytes coming back from the server.
+	 */
+	if (rap->rap_sseq == 0) {
+		s = memstr("PNA", membuf, 3, dlen);
+		if (s == NULL)
+			return 0;
+		a1 = s - membuf;
+		dlen -= a1;
+		a1 = 0;
+		rap->rap_sseq = seq;
+		a2 = MIN(dlen, sizeof(rap->rap_svr));
+	} else if (seq <= rap->rap_sseq + sizeof(rap->rap_svr)) {
+		/*
+		 * seq # which is the start of data and from that the offset
+		 * into the buffer array.
+		 */
+		a1 = seq - rap->rap_sseq;
+		a2 = MIN(dlen, sizeof(rap->rap_svr));
+		a2 -= a1;
+		s = membuf;
+	} else
+		return 0;
+
+	for (a3 = a1, a4 = a2; a4 > 0; a4--, a3++) {
+		rap->rap_sbf |= (1 << a3);
+		rap->rap_svr[a3] = *s++;
+	}
+	if (rap->rap_sbf == 0x7ffff) {		/* 19 bits */
+		s = rap->rap_svr + 13;
+		rap->rap_srport = (*s << 8) | *(s + 1);
+	}
+	return 0;
+}
diff --git a/sys/contrib/ipfilter/netinet/ip_rcmd_pxy.c b/sys/contrib/ipfilter/netinet/ip_rcmd_pxy.c
new file mode 100644
index 0000000..f9dc5b3
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_rcmd_pxy.c
@@ -0,0 +1,160 @@
+/*
+ * $Id$
+ * $FreeBSD$
+ */
+/*
+ * Simple RCMD transparent proxy for in-kernel use.  For use with the NAT
+ * code.
+ */
+#if SOLARIS && defined(_KERNEL)
+extern	kmutex_t	ipf_rw;
+#endif
+
+#define	isdigit(x)	((x) >= '0' && (x) <= '9')
+
+#define	IPF_RCMD_PROXY
+
+
+int ippr_rcmd_init __P((void));
+int ippr_rcmd_new __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+int ippr_rcmd_out __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+u_short ipf_rcmd_atoi __P((char *));
+int ippr_rcmd_portmsg __P((fr_info_t *, ip_t *, ap_session_t *, nat_t *));
+
+static	frentry_t	rcmdfr;
+
+
+/*
+ * RCMD application proxy initialization.
+ */
+int ippr_rcmd_init()
+{
+	bzero((char *)&rcmdfr, sizeof(rcmdfr));
+	rcmdfr.fr_ref = 1;
+	rcmdfr.fr_flags = FR_INQUE|FR_PASS|FR_QUICK|FR_KEEPSTATE;
+	return 0;
+}
+
+
+/*
+ * Setup for a new RCMD proxy.
+ */
+int ippr_rcmd_new(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+
+	aps->aps_psiz = sizeof(u_32_t);
+	KMALLOCS(aps->aps_data, u_32_t *, sizeof(u_32_t));
+	if (aps->aps_data == NULL)
+		return -1;
+	*(u_32_t *)aps->aps_data = 0;
+	aps->aps_sport = tcp->th_sport;
+	aps->aps_dport = tcp->th_dport;
+	return 0;
+}
+
+
+/*
+ * ipf_rcmd_atoi - implement a simple version of atoi
+ */
+u_short ipf_rcmd_atoi(ptr)
+char *ptr;
+{
+	register char *s = ptr, c;
+	register u_short i = 0;
+
+	while ((c = *s++) && isdigit(c)) {
+		i *= 10;
+		i += c - '0';
+	}
+	return i;
+}
+
+
+int ippr_rcmd_portmsg(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	char portbuf[8], *s;
+	struct in_addr swip;
+	u_short sp, dp;
+	int off, dlen;
+	tcphdr_t *tcp, tcph, *tcp2 = &tcph;
+	fr_info_t fi;
+	nat_t *ipn;
+	mb_t *m;
+#if	SOLARIS
+	mb_t *m1;
+#endif
+
+	tcp = (tcphdr_t *)fin->fin_dp;
+	off = (ip->ip_hl << 2) + (tcp->th_off << 2);
+	m = *(mb_t **)fin->fin_mp;
+
+#if	SOLARIS
+	m = fin->fin_qfm;
+
+	dlen = msgdsize(m) - off;
+	bzero(portbuf, sizeof(portbuf));
+	copyout_mblk(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#else
+	dlen = mbufchainlen(m) - off;
+	bzero(portbuf, sizeof(portbuf));
+	m_copydata(m, off, MIN(sizeof(portbuf), dlen), portbuf);
+#endif
+	if ((*(u_32_t *)aps->aps_data != 0) &&
+	    (tcp->th_seq != *(u_32_t *)aps->aps_data))
+		return 0;
+
+	portbuf[sizeof(portbuf) - 1] = '\0';
+	s = portbuf;
+	sp = ipf_rcmd_atoi(s);
+	if (!sp)
+		return 0;
+
+	/*
+	 * Add skeleton NAT entry for connection which will come back the
+	 * other way.
+	 */
+	sp = htons(sp);
+	dp = htons(fin->fin_data[1]);
+	ipn = nat_outlookup(fin->fin_ifp, IPN_TCP, nat->nat_p, nat->nat_inip,
+			    ip->ip_dst, (dp << 16) | sp);
+	if (ipn == NULL) {
+		bcopy((char *)fin, (char *)&fi, sizeof(fi));
+		bzero((char *)tcp2, sizeof(*tcp2));
+		tcp2->th_win = htons(8192);
+		tcp2->th_sport = sp;
+		tcp2->th_dport = 0; /* XXX - don't specify remote port */
+		fi.fin_data[0] = ntohs(sp);
+		fi.fin_data[1] = 0;
+		fi.fin_dp = (char *)tcp2;
+		swip = ip->ip_src;
+		ip->ip_src = nat->nat_inip;
+		ipn = nat_new(nat->nat_ptr, ip, &fi, IPN_TCP|FI_W_DPORT,
+			      NAT_OUTBOUND);
+		if (ipn != NULL) {
+			ipn->nat_age = fr_defnatage;
+			fi.fin_fr = &rcmdfr;
+			(void) fr_addstate(ip, &fi, FI_W_DPORT);
+		}
+		ip->ip_src = swip;
+	}
+	return 0;
+}
+
+
+int ippr_rcmd_out(fin, ip, aps, nat)
+fr_info_t *fin;
+ip_t *ip;
+ap_session_t *aps;
+nat_t *nat;
+{
+	return ippr_rcmd_portmsg(fin, ip, aps, nat);
+}
diff --git a/sys/contrib/ipfilter/netinet/ip_state.c b/sys/contrib/ipfilter/netinet/ip_state.c
new file mode 100644
index 0000000..8d5cb82
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_state.c
@@ -0,0 +1,1105 @@
+/*
+ * Copyright (C) 1995-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint)
+static const char sccsid[] = "@(#)ip_state.c	1.8 6/5/96 (C) 1993-1995 Darren Reed";
+/*static const char rcsid[] = "@(#)$Id: ip_state.c,v 2.3.2.9 1999/10/21 14:31:09 darrenr Exp $";*/
+static const char rcsid[] = "@(#)$FreeBSD$";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
+    defined(_KERNEL)
+# include "opt_ipfilter_log.h"
+#endif
+#if !defined(_KERNEL) && !defined(KERNEL) && !defined(__KERNEL__)
+# include <stdio.h>
+# include <stdlib.h>
+# include <string.h>
+#else
+# ifdef linux
+#  include <linux/kernel.h>
+#  include <linux/module.h>
+# endif
+#endif
+#if defined(KERNEL) && (__FreeBSD_version >= 220000)
+# include <sys/filio.h>
+# include <sys/fcntl.h>
+# if (__FreeBSD_version >= 300000) && !defined(IPFILTER_LKM)
+#  include "opt_ipfilter.h"
+# endif
+#else
+# include <sys/ioctl.h>
+#endif
+#include <sys/time.h>
+#include <sys/uio.h>
+#ifndef linux
+# include <sys/protosw.h>
+#endif
+#include <sys/socket.h>
+#if defined(_KERNEL) && !defined(linux)
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# ifndef linux
+#  include <sys/mbuf.h>
+# endif
+#else
+# include <sys/filio.h>
+# include <sys/byteorder.h>
+# ifdef _KERNEL
+#  include <sys/dditypes.h>
+# endif
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#ifndef linux
+# include <netinet/ip_var.h>
+# include <netinet/tcp_fsm.h>
+#endif
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include "netinet/ip_compat.h"
+#include <netinet/tcpip.h>
+#include "netinet/ip_fil.h"
+#include "netinet/ip_nat.h"
+#include "netinet/ip_frag.h"
+#include "netinet/ip_proxy.h"
+#include "netinet/ip_state.h"
+#if (__FreeBSD_version >= 300000)
+# include <sys/malloc.h>
+# if (defined(_KERNEL) || defined(KERNEL)) && !defined(IPFILTER_LKM)
+#  include <sys/libkern.h>
+#  include <sys/systm.h>
+# endif
+#endif
+
+#ifndef	MIN
+# define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+
+#define	TCP_CLOSE	(TH_FIN|TH_RST)
+
+static ipstate_t **ips_table = NULL;
+static int	ips_num = 0;
+static ips_stat_t ips_stats;
+#if	(SOLARIS || defined(__sgi)) && defined(_KERNEL)
+extern	KRWLOCK_T	ipf_state, ipf_mutex;
+extern	kmutex_t	ipf_rw;
+#endif
+
+static int fr_matchsrcdst __P((ipstate_t *, struct in_addr, struct in_addr,
+			       fr_info_t *, tcphdr_t *));
+static frentry_t *fr_checkicmpmatchingstate __P((ip_t *, fr_info_t *));
+static int fr_state_flush __P((int));
+static ips_stat_t *fr_statetstats __P((void));
+static void fr_delstate __P((ipstate_t *));
+
+
+#define	FIVE_DAYS	(2 * 5 * 86400)	/* 5 days: half closed session */
+
+#define	TCP_MSL	240			/* 2 minutes */
+u_long	fr_tcpidletimeout = FIVE_DAYS,
+	fr_tcpclosewait = 2 * TCP_MSL,
+	fr_tcplastack = 2 * TCP_MSL,
+	fr_tcptimeout = 2 * TCP_MSL,
+	fr_tcpclosed = 1,
+	fr_udptimeout = 240,
+	fr_icmptimeout = 120;
+int	fr_statemax = IPSTATE_MAX,
+	fr_statesize = IPSTATE_SIZE;
+int	fr_state_doflush = 0;
+
+
+int fr_stateinit()
+{
+	KMALLOCS(ips_table, ipstate_t **, fr_statesize * sizeof(ipstate_t *));
+	if (ips_table != NULL)
+		bzero((char *)ips_table, fr_statesize * sizeof(ipstate_t *));
+	else
+		return -1;
+	return 0;
+}
+
+
+static ips_stat_t *fr_statetstats()
+{
+	ips_stats.iss_active = ips_num;
+	ips_stats.iss_table = ips_table;
+	return &ips_stats;
+}
+
+
+/*
+ * flush state tables.  two actions currently defined:
+ * which == 0 : flush all state table entries
+ * which == 1 : flush TCP connections which have started to close but are
+ *              stuck for some reason.
+ */
+static int fr_state_flush(which)
+int which;
+{
+	register int i;
+	register ipstate_t *is, **isp;
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+	int delete, removed = 0;
+
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_state);
+	for (i = fr_statesize - 1; i >= 0; i--)
+		for (isp = &ips_table[i]; (is = *isp); ) {
+			delete = 0;
+
+			switch (which)
+			{
+			case 0 :
+				delete = 1;
+				break;
+			case 1 :
+				if ((is->is_p == IPPROTO_TCP) &&
+				    (((is->is_state[0] <= TCPS_ESTABLISHED) &&
+				      (is->is_state[1] > TCPS_ESTABLISHED)) ||
+				     ((is->is_state[1] <= TCPS_ESTABLISHED) &&
+				      (is->is_state[0] > TCPS_ESTABLISHED))))
+					delete = 1;
+				break;
+			}
+
+			if (delete) {
+				*isp = is->is_next;
+				if (is->is_p == IPPROTO_TCP)
+					ips_stats.iss_fin++;
+				else
+					ips_stats.iss_expire++;
+				if (ips_table[i] == NULL)
+					ips_stats.iss_inuse--;
+#ifdef	IPFILTER_LOG
+				ipstate_log(is, ISL_FLUSH);
+#endif
+				fr_delstate(is);
+				ips_num--;
+				removed++;
+			} else
+				isp = &is->is_next;
+		}
+	if (fr_state_doflush) {
+		(void) fr_state_flush(1);
+		fr_state_doflush = 0;
+	}
+	RWLOCK_EXIT(&ipf_state);
+	SPL_X(s);
+	return removed;
+}
+
+
+int fr_state_ioctl(data, cmd, mode)
+caddr_t data;
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+u_long cmd;
+#else
+int cmd;
+#endif
+int mode;
+{
+	int	arg, ret, error = 0;
+
+	switch (cmd)
+	{
+	case SIOCIPFFL :
+		IRCOPY(data, (caddr_t)&arg, sizeof(arg));
+		if (arg == 0 || arg == 1) {
+			ret = fr_state_flush(arg);
+			IWCOPY((caddr_t)&ret, data, sizeof(ret));
+		} else
+			error = EINVAL;
+		break;
+	case SIOCGIPST :
+		IWCOPY((caddr_t)fr_statetstats(), data, sizeof(ips_stat_t));
+		break;
+	case FIONREAD :
+#ifdef	IPFILTER_LOG
+		IWCOPY((caddr_t)&iplused[IPL_LOGSTATE], (caddr_t)data,
+		       sizeof(iplused[IPL_LOGSTATE]));
+#endif
+		break;
+	default :
+		error = EINVAL;
+		break;
+	}
+	return error;
+}
+
+
+/*
+ * Create a new ipstate structure and hang it off the hash table.
+ */
+ipstate_t *fr_addstate(ip, fin, flags)
+ip_t *ip;
+fr_info_t *fin;
+u_int flags;
+{
+	register ipstate_t *is;
+	register u_int hv;
+	ipstate_t ips;
+	u_int pass;
+
+	if ((ip->ip_off & IP_OFFMASK) || (fin->fin_fi.fi_fl & FI_SHORT))
+		return NULL;
+	if (ips_num == fr_statemax) {
+		ips_stats.iss_max++;
+		fr_state_doflush = 1;
+		return NULL;
+	}
+	is = &ips;
+	bzero((char *)is, sizeof(*is));
+	ips.is_age = 1;
+	ips.is_state[0] = 0;
+	ips.is_state[1] = 0;
+	/*
+	 * Copy and calculate...
+	 */
+	hv = (is->is_p = ip->ip_p);
+	hv += (is->is_src.s_addr = ip->ip_src.s_addr);
+	hv += (is->is_dst.s_addr = ip->ip_dst.s_addr);
+
+	switch (ip->ip_p)
+	{
+	case IPPROTO_ICMP :
+	    {
+		struct icmp *ic = (struct icmp *)fin->fin_dp;
+
+		switch (ic->icmp_type)
+		{
+		case ICMP_ECHO :
+			is->is_icmp.ics_type = ICMP_ECHOREPLY;	/* XXX */
+			hv += (is->is_icmp.ics_id = ic->icmp_id);
+			hv += (is->is_icmp.ics_seq = ic->icmp_seq);
+			break;
+		case ICMP_TSTAMP :
+		case ICMP_IREQ :
+		case ICMP_MASKREQ :
+			is->is_icmp.ics_type = ic->icmp_type + 1;
+			break;
+		default :
+			return NULL;
+		}
+		ATOMIC_INC(ips_stats.iss_icmp);
+		is->is_age = fr_icmptimeout;
+		break;
+	    }
+	case IPPROTO_TCP :
+	    {
+		register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+
+		/*
+		 * The endian of the ports doesn't matter, but the ack and
+		 * sequence numbers do as we do mathematics on them later.
+		 */
+		is->is_dport = tcp->th_dport;
+		is->is_sport = tcp->th_sport;
+		if ((flags & (FI_W_DPORT|FI_W_SPORT)) == 0) {
+			hv += tcp->th_dport;
+			hv += tcp->th_sport;
+		}
+		if (tcp->th_seq != 0) {
+			is->is_send = ntohl(tcp->th_seq) + ip->ip_len -
+				      fin->fin_hlen - (tcp->th_off << 2) +
+				      ((tcp->th_flags & TH_SYN) ? 1 : 0) +
+				      ((tcp->th_flags & TH_FIN) ? 1 : 0);
+			is->is_maxsend = is->is_send + 1;
+		}
+		is->is_dend = 0;
+		is->is_maxswin = ntohs(tcp->th_win);
+		if (is->is_maxswin == 0)
+			is->is_maxswin = 1;
+		/*
+		 * If we're creating state for a starting connection, start the
+		 * timer on it as we'll never see an error if it fails to
+		 * connect.
+		 */
+		MUTEX_ENTER(&ipf_rw);
+		ips_stats.iss_tcp++;
+		fr_tcp_age(&is->is_age, is->is_state, ip, fin,
+			   tcp->th_sport == is->is_sport);
+		MUTEX_EXIT(&ipf_rw);
+		break;
+	    }
+	case IPPROTO_UDP :
+	    {
+		register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+
+		if ((flags & (FI_W_DPORT|FI_W_SPORT)) == 0) {
+			hv += (is->is_dport = tcp->th_dport);
+			hv += (is->is_sport = tcp->th_sport);
+		}
+		ATOMIC_INC(ips_stats.iss_udp);
+		is->is_age = fr_udptimeout;
+		break;
+	    }
+	default :
+		return NULL;
+	}
+
+	KMALLOC(is, ipstate_t *);
+	if (is == NULL) {
+		ATOMIC_INC(ips_stats.iss_nomem);
+		return NULL;
+	}
+	bcopy((char *)&ips, (char *)is, sizeof(*is));
+	hv %= fr_statesize;
+	RW_UPGRADE(&ipf_mutex);
+	is->is_rule = fin->fin_fr;
+	if (is->is_rule != NULL) {
+		is->is_rule->fr_ref++;
+		pass = is->is_rule->fr_flags;
+	} else
+		pass = fr_flags;
+	MUTEX_DOWNGRADE(&ipf_mutex);
+	WRITE_ENTER(&ipf_state);
+
+	is->is_rout = pass & FR_OUTQUE ? 1 : 0;
+	is->is_pass = pass;
+	is->is_pkts = 1;
+	is->is_bytes = ip->ip_len;
+	/*
+	 * We want to check everything that is a property of this packet,
+	 * but we don't (automatically) care about it's fragment status as
+	 * this may change.
+	 */
+	is->is_opt = fin->fin_fi.fi_optmsk;
+	is->is_optmsk = 0xffffffff;
+	is->is_sec = fin->fin_fi.fi_secmsk;
+	is->is_secmsk = 0xffff;
+	is->is_auth = fin->fin_fi.fi_auth;
+	is->is_authmsk = 0xffff;
+	is->is_flags = fin->fin_fi.fi_fl & FI_CMP;
+	is->is_flags |= FI_CMP << 4;
+	is->is_flags |= flags & (FI_W_DPORT|FI_W_SPORT);
+	/*
+	 * add into table.
+	 */
+	is->is_next = ips_table[hv];
+	ips_table[hv] = is;
+	if (is->is_next == NULL)
+		ips_stats.iss_inuse++;
+	if (fin->fin_out) {
+		is->is_ifpin = NULL;
+		is->is_ifpout = fin->fin_ifp;
+	} else {
+		is->is_ifpin = fin->fin_ifp;
+		is->is_ifpout = NULL;
+	}
+	if (pass & FR_LOGFIRST)
+		is->is_pass &= ~(FR_LOGFIRST|FR_LOG);
+	ATOMIC_INC(ips_num);
+#ifdef	IPFILTER_LOG
+	ipstate_log(is, ISL_NEW);
+#endif
+	RWLOCK_EXIT(&ipf_state);
+	fin->fin_rev = (is->is_dst.s_addr != ip->ip_dst.s_addr);
+	if (fin->fin_fi.fi_fl & FI_FRAG)
+		ipfr_newfrag(ip, fin, pass ^ FR_KEEPSTATE);
+	return is;
+}
+
+
+
+/*
+ * check to see if a packet with TCP headers fits within the TCP window.
+ * change timeout depending on whether new packet is a SYN-ACK returning for a
+ * SYN or a RST or FIN which indicate time to close up shop.
+ */
+int fr_tcpstate(is, fin, ip, tcp)
+register ipstate_t *is;
+fr_info_t *fin;
+ip_t *ip;
+tcphdr_t *tcp;
+{
+	register tcp_seq seq, ack, end;
+	register int ackskew;
+	tcpdata_t  *fdata, *tdata;
+	u_short	win, maxwin;
+	int ret = 0;
+	int source;
+
+	/*
+	 * Find difference between last checked packet and this packet.
+	 */
+	source = (ip->ip_src.s_addr == is->is_src.s_addr);
+	fdata = &is->is_tcp.ts_data[!source];
+	tdata = &is->is_tcp.ts_data[source];
+	seq = ntohl(tcp->th_seq);
+	ack = ntohl(tcp->th_ack);
+	win = ntohs(tcp->th_win);
+	end = seq + ip->ip_len - fin->fin_hlen - (tcp->th_off << 2) +
+	       ((tcp->th_flags & TH_SYN) ? 1 : 0) +
+	       ((tcp->th_flags & TH_FIN) ? 1 : 0);      
+
+	if (fdata->td_end == 0) {
+		/*
+		 * Must be a (outgoing) SYN-ACK in reply to a SYN.
+		 */
+		fdata->td_end = end;
+		fdata->td_maxwin = 1;
+		fdata->td_maxend = end + 1;
+	}
+
+	if (!(tcp->th_flags & TH_ACK)) {  /* Pretend an ack was sent */
+		ack = tdata->td_end;
+		win = 1;
+	} else if (((tcp->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) &&
+		   (ack == 0)) {
+		/* gross hack to get around certain broken tcp stacks */
+		ack = tdata->td_end;
+	}
+
+	if (seq == end)
+		seq = end = fdata->td_end;
+
+	maxwin = tdata->td_maxwin;
+	ackskew = tdata->td_end - ack;
+
+#define	SEQ_GE(a,b)	((int)((a) - (b)) >= 0)
+#define	SEQ_GT(a,b)	((int)((a) - (b)) > 0)
+	if ((SEQ_GE(fdata->td_maxend, end)) &&
+	    (SEQ_GE(seq + maxwin, fdata->td_end - maxwin)) && 
+/* XXX what about big packets */
+#define MAXACKWINDOW 66000
+	    (ackskew >= -MAXACKWINDOW) &&
+	    (ackskew <= MAXACKWINDOW)) {
+		/* if ackskew < 0 then this should be due to fragented
+		 * packets. There is no way to know the length of the
+		 * total packet in advance.
+		 * We do know the total length from the fragment cache though.
+		 * Note however that there might be more sessions with
+		 * exactly the same source and destination paramters in the
+		 * state cache (and source and destination is the only stuff
+		 * that is saved in the fragment cache). Note further that
+		 * some TCP connections in the state cache are hashed with
+		 * sport and dport as well which makes it not worthwhile to
+		 * look for them.
+		 * Thus, when ackskew is negative but still seems to belong
+		 * to this session, we bump up the destinations end value.
+		 */
+		if (ackskew < 0)
+			tdata->td_end = ack;
+
+		/* update max window seen */
+		if (fdata->td_maxwin < win)
+			fdata->td_maxwin = win;
+		if (SEQ_GT(end, fdata->td_end))
+			fdata->td_end = end;
+		if (SEQ_GE(ack + win, tdata->td_maxend)) {
+			tdata->td_maxend = ack + win;
+			if (win == 0)
+				tdata->td_maxend++;
+		}
+
+		ATOMIC_INC(ips_stats.iss_hits);
+		is->is_pkts++;
+		is->is_bytes += ip->ip_len;
+		/*
+		 * Nearing end of connection, start timeout.
+		 */
+		MUTEX_ENTER(&ipf_rw);
+		fr_tcp_age(&is->is_age, is->is_state, ip, fin, source);
+		MUTEX_EXIT(&ipf_rw);
+		ret = 1;
+	}
+	return ret;
+}
+
+
+static int fr_matchsrcdst(is, src, dst, fin, tcp)
+ipstate_t *is;
+struct in_addr src, dst;
+fr_info_t *fin;
+tcphdr_t *tcp;
+{
+	int ret = 0, rev, out, flags;
+	u_short sp, dp;
+	void *ifp;
+
+	rev = fin->fin_rev = (is->is_dst.s_addr != dst.s_addr);
+	ifp = fin->fin_ifp;
+	out = fin->fin_out;
+
+	if (tcp != NULL) {
+		flags = is->is_flags;
+		sp = tcp->th_sport;
+		dp = tcp->th_dport;
+	} else {
+		flags = 0;
+		sp = 0;
+		dp = 0;
+	}
+
+	if (rev == 0) {
+		if (!out) {
+			if (is->is_ifpin == ifp)
+				ret = 1;
+		} else {
+			if (is->is_ifpout == NULL || is->is_ifpout == ifp)
+				ret = 1;
+		}
+	} else {
+		if (out) {
+			if (is->is_ifpin == ifp)
+				ret = 1;
+		} else {
+			if (is->is_ifpout == NULL || is->is_ifpout == ifp)
+				ret = 1;
+		}
+	}
+	if (ret == 0)
+		return 0;
+	ret = 0;
+
+	if (rev == 0) {
+		if ((is->is_dst.s_addr == dst.s_addr) &&
+		    (is->is_src.s_addr == src.s_addr) &&
+		    (!tcp || ((sp == is->is_sport || flags & FI_W_SPORT) &&
+		     (dp == is->is_dport || flags & FI_W_DPORT)))) {
+			ret = 1;
+		}
+	} else {
+		if ((is->is_dst.s_addr == src.s_addr) &&
+		    (is->is_src.s_addr == dst.s_addr) &&
+		    (!tcp || ((sp == is->is_dport || flags & FI_W_DPORT) &&
+		     (dp == is->is_sport || flags & FI_W_SPORT)))) {
+			ret = 1;
+		}
+	}
+	if (ret == 0)
+		return 0;
+
+	/*
+	 * Whether or not this should be here, is questionable, but the aim
+	 * is to get this out of the main line.
+	 */
+	if (tcp == NULL)
+		flags = is->is_flags & (FI_CMP|(FI_CMP<<4));
+
+	if (((fin->fin_fi.fi_fl & (flags >> 4)) != (flags & FI_CMP)) ||
+	    ((fin->fin_fi.fi_optmsk & is->is_optmsk) != is->is_opt) ||
+	    ((fin->fin_fi.fi_secmsk & is->is_secmsk) != is->is_sec) ||
+	    ((fin->fin_fi.fi_auth & is->is_authmsk) != is->is_auth))
+		return 0;
+
+	if ((flags & (FI_W_SPORT|FI_W_DPORT))) {
+		if ((flags & FI_W_SPORT) != 0) {
+			if (rev == 0) {
+				is->is_sport = sp;
+				is->is_send = htonl(tcp->th_seq);
+			} else {
+				is->is_sport = dp;
+				is->is_send = htonl(tcp->th_ack);
+			}
+			is->is_maxsend = is->is_send + 1;
+		} else if ((flags & FI_W_DPORT) != 0) {
+			if (rev == 0) {
+				is->is_dport = dp;
+				is->is_dend = htonl(tcp->th_ack);
+			} else {
+				is->is_dport = sp;
+				is->is_dend = htonl(tcp->th_seq);
+			}
+			is->is_maxdend = is->is_dend + 1;
+		}
+		is->is_flags &= ~(FI_W_SPORT|FI_W_DPORT);
+	}
+
+	if (!rev) {
+		if (out && (out == is->is_rout)) {
+			if (!is->is_ifpout)
+				is->is_ifpout = ifp;
+		} else {
+			if (!is->is_ifpin)
+				is->is_ifpin = ifp;
+		}
+	} else {
+		if (!out && (out != is->is_rout)) {
+			if (!is->is_ifpin)
+				is->is_ifpin = ifp;
+		} else {
+			if (!is->is_ifpout)
+				is->is_ifpout = ifp;
+		}
+	}
+	return 1;
+}
+
+frentry_t *fr_checkicmpmatchingstate(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	register struct in_addr	dst, src;
+	register ipstate_t *is, **isp;
+	register u_short sport, dport;
+	register u_char	pr;
+	struct icmp *ic;
+	fr_info_t ofin;
+	u_int hv, dest;
+	tcphdr_t *tcp;
+	frentry_t *fr;
+	ip_t *oip;
+	int type;
+
+	/* 
+	 * Does it at least have the return (basic) IP header ? 
+	 * Only a basic IP header (no options) should be with
+	 * an ICMP error header.
+	 */
+	if ((ip->ip_hl != 5) || (ip->ip_len < ICMPERR_MINPKTLEN))
+		return NULL;
+	ic = (struct icmp *)((char *)ip + fin->fin_hlen);
+	type = ic->icmp_type;
+	/*
+	 * If it's not an error type, then return
+	 */
+	if ((type != ICMP_UNREACH) && (type != ICMP_SOURCEQUENCH) &&
+    	    (type != ICMP_REDIRECT) && (type != ICMP_TIMXCEED) &&
+    	    (type != ICMP_PARAMPROB))
+		return NULL;
+
+	oip = (ip_t *)((char *)fin->fin_dp + ICMPERR_ICMPHLEN);
+	if (ip->ip_len < ICMPERR_MAXPKTLEN + ((oip->ip_hl - 5) << 2))
+		return NULL;
+	if ((oip->ip_p != IPPROTO_TCP) && (oip->ip_p != IPPROTO_UDP))
+		return NULL;
+
+	tcp = (tcphdr_t *)((char *)oip + (oip->ip_hl << 2));
+	dport = tcp->th_dport;
+	sport = tcp->th_sport;
+
+	hv = (pr = oip->ip_p);
+	hv += (src.s_addr = oip->ip_src.s_addr);
+	hv += (dst.s_addr = oip->ip_dst.s_addr);
+	hv += dport;
+	hv += sport;
+	hv %= fr_statesize;
+	/*
+	 * we make an fin entry to be able to feed it to
+	 * matchsrcdst note that not all fields are encessary
+	 * but this is the cleanest way. Note further we fill
+	 * in fin_mp such that if someone uses it we'll get
+	 * a kernel panic. fr_matchsrcdst does not use this.
+	 *
+	 * watch out here, as ip is in host order and oip in network
+	 * order. Any change we make must be undone afterwards.
+	 */
+	oip->ip_len = ntohs(oip->ip_len);
+	fr_makefrip(oip->ip_hl << 2, oip, &ofin);
+	oip->ip_len = htons(oip->ip_len);
+	ofin.fin_ifp = fin->fin_ifp;
+	ofin.fin_out = !fin->fin_out;
+	ofin.fin_mp = NULL; /* if dereferenced, panic XXX */
+	READ_ENTER(&ipf_state);
+	for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next) {
+		/*
+		 * Only allow this icmp though if the
+		 * encapsulated packet was allowed through the
+		 * other way around. Note that the minimal amount
+		 * of info present does not allow for checking against
+		 * tcp internals such as seq and ack numbers.
+		 */
+		if ((is->is_p == pr) &&
+		    fr_matchsrcdst(is, src, dst, &ofin, tcp)) {
+			fr = is->is_rule;
+			ips_stats.iss_hits++;
+			/*
+			 * we must swap src and dst here because the icmp
+			 * comes the other way around
+			 */
+			dest = (is->is_dst.s_addr != src.s_addr);
+			is->is_pkts++;
+			is->is_bytes += ip->ip_len;     
+			/*
+			 * we deliberately do not touch the timeouts
+			 * for the accompanying state table entry.
+			 * It remains to be seen if that is correct. XXX
+			 */
+			RWLOCK_EXIT(&ipf_state);
+			return fr;
+		}
+	}
+	RWLOCK_EXIT(&ipf_state);
+	return NULL;
+}
+
+/*
+ * Check if a packet has a registered state.
+ */
+frentry_t *fr_checkstate(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+	register struct in_addr dst, src;
+	register ipstate_t *is, **isp;
+	register u_char pr;
+	u_int hv, hvm, hlen, tryagain, pass;
+	struct icmp *ic;
+	frentry_t *fr;
+	tcphdr_t *tcp;
+
+	if ((ip->ip_off & IP_OFFMASK) || (fin->fin_fi.fi_fl & FI_SHORT))
+		return NULL;
+
+	is = NULL;
+	hlen = fin->fin_hlen;
+	tcp = (tcphdr_t *)((char *)ip + hlen);
+	ic = (struct icmp *)tcp;
+	hv = (pr = ip->ip_p);
+	hv += (src.s_addr = ip->ip_src.s_addr);
+	hv += (dst.s_addr = ip->ip_dst.s_addr);
+
+	/*
+	 * Search the hash table for matching packet header info.
+	 */
+	switch (ip->ip_p)
+	{
+	case IPPROTO_ICMP :
+		hv += ic->icmp_id;
+		hv += ic->icmp_seq;
+		hv %= fr_statesize;
+		READ_ENTER(&ipf_state);
+		for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next)
+			if ((is->is_p == pr) &&
+			    (ic->icmp_id == is->is_icmp.ics_id) &&
+			    (ic->icmp_seq == is->is_icmp.ics_seq) &&
+			    fr_matchsrcdst(is, src, dst, fin, NULL)) {
+				if ((is->is_type == ICMP_ECHOREPLY) &&
+				    (ic->icmp_type == ICMP_ECHO))
+					;
+				else if (is->is_type != ic->icmp_type)
+					continue;
+				is->is_age = fr_icmptimeout;
+				break;
+			}
+		if (is != NULL)
+			break;
+		RWLOCK_EXIT(&ipf_state);
+		/*
+		 * No matching icmp state entry. Perhaps this is a
+		 * response to another state entry.
+		 */
+		fr = fr_checkicmpmatchingstate(ip, fin);
+		if (fr)
+			return fr;
+		break;
+	case IPPROTO_TCP :
+	    {
+		register u_short dport = tcp->th_dport, sport = tcp->th_sport;
+
+		tryagain = 0;
+retry_tcp:
+		hvm = hv % fr_statesize;
+		WRITE_ENTER(&ipf_state);
+		for (isp = &ips_table[hvm]; (is = *isp);
+		     isp = &is->is_next)
+			if ((is->is_p == pr) &&
+			    fr_matchsrcdst(is, src, dst, fin, tcp)) {
+				if (fr_tcpstate(is, fin, ip, tcp)) {
+					break;
+#ifndef	_KERNEL
+					if (tcp->th_flags & TCP_CLOSE) {
+						*isp = is->is_next;
+						isp = &ips_table[hvm];
+						if (ips_table[hvm] == NULL)
+							ips_stats.iss_inuse--;
+						fr_delstate(is);
+						ips_num--;
+					}
+#endif
+					break;
+				}
+				is = NULL;
+				break;
+			}
+		if (is != NULL)
+			break;
+		RWLOCK_EXIT(&ipf_state);
+		hv += dport;
+		hv += sport;
+		if (tryagain == 0) {
+			tryagain = 1;
+			goto retry_tcp;
+		}
+		break;
+	    }
+	case IPPROTO_UDP :
+	    {
+		register u_short dport = tcp->th_dport, sport = tcp->th_sport;
+
+		tryagain = 0;
+retry_udp:
+		hvm = hv % fr_statesize;
+		/*
+		 * Nothing else to match on but ports. and IP#'s
+		 */
+		READ_ENTER(&ipf_state);
+		for (is = ips_table[hvm]; is; is = is->is_next)
+			if ((is->is_p == pr) &&
+			    fr_matchsrcdst(is, src, dst, fin, tcp)) {
+				is->is_age = fr_udptimeout;
+				break;
+			}
+		if (is != NULL)
+			break;
+		RWLOCK_EXIT(&ipf_state);
+		hv += dport;
+		hv += sport;
+		if (tryagain == 0) {
+			tryagain = 1;
+			goto retry_udp;
+		}
+		break;
+	    }
+	default :
+		break;
+	}
+	if (is == NULL) {
+		ATOMIC_INC(ips_stats.iss_miss);
+		return NULL;
+	}
+	MUTEX_ENTER(&ipf_rw);
+	is->is_bytes += ip->ip_len;
+	ips_stats.iss_hits++;
+	is->is_pkts++;
+	MUTEX_EXIT(&ipf_rw);
+	fr = is->is_rule;
+	fin->fin_fr = fr;
+	pass = is->is_pass;
+	RWLOCK_EXIT(&ipf_state);
+	if (fin->fin_fi.fi_fl & FI_FRAG)
+		ipfr_newfrag(ip, fin, pass ^ FR_KEEPSTATE);
+	return fr;
+}
+
+
+static void fr_delstate(is)
+ipstate_t *is;
+{
+	frentry_t *fr;
+
+	fr = is->is_rule;
+	if (fr != NULL) {
+		ATOMIC_DEC(fr->fr_ref);
+		if (fr->fr_ref == 0)
+			KFREE(fr);
+	}
+	KFREE(is);
+}
+
+
+/*
+ * Free memory in use by all state info. kept.
+ */
+void fr_stateunload()
+{
+	register int i;
+	register ipstate_t *is, **isp;
+
+	WRITE_ENTER(&ipf_state);
+	for (i = fr_statesize - 1; i >= 0; i--)
+		for (isp = &ips_table[i]; (is = *isp); ) {
+			*isp = is->is_next;
+			fr_delstate(is);
+			ips_num--;
+		}
+	ips_stats.iss_inuse = 0;
+	ips_num = 0;
+	RWLOCK_EXIT(&ipf_state);
+	KFREES(ips_table, fr_statesize * sizeof(ipstate_t *));
+	ips_table = NULL;
+}
+
+
+/*
+ * Slowly expire held state for thingslike UDP and ICMP.  Timeouts are set
+ * in expectation of this being called twice per second.
+ */
+void fr_timeoutstate()
+{
+	register int i;
+	register ipstate_t *is, **isp;
+#if defined(_KERNEL) && !SOLARIS
+	int s;
+#endif
+
+	SPL_NET(s);
+	WRITE_ENTER(&ipf_state);
+	for (i = fr_statesize - 1; i >= 0; i--)
+		for (isp = &ips_table[i]; (is = *isp); )
+			if (is->is_age && !--is->is_age) {
+				*isp = is->is_next;
+				if (is->is_p == IPPROTO_TCP)
+					ips_stats.iss_fin++;
+				else
+					ips_stats.iss_expire++;
+				if (ips_table[i] == NULL)
+					ips_stats.iss_inuse--;
+#ifdef	IPFILTER_LOG
+				ipstate_log(is, ISL_EXPIRE);
+#endif
+				fr_delstate(is);
+				ips_num--;
+			} else
+				isp = &is->is_next;
+	RWLOCK_EXIT(&ipf_state);
+	SPL_X(s);
+}
+
+
+/*
+ * Original idea freom Pradeep Krishnan for use primarily with NAT code.
+ * (pkrishna@netcom.com)
+ */
+void fr_tcp_age(age, state, ip, fin, dir)
+u_long *age;
+u_char *state;
+ip_t *ip;
+fr_info_t *fin;
+int dir;
+{
+	tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+	u_char flags = tcp->th_flags;
+	int dlen, ostate;
+
+	ostate = state[1 - dir];
+
+	dlen = ip->ip_len - fin->fin_hlen - (tcp->th_off << 2);
+
+	if (flags & TH_RST) {
+		if (!(tcp->th_flags & TH_PUSH) && !dlen) {
+			*age = fr_tcpclosed;
+			state[dir] = TCPS_CLOSED;
+		} else {
+			*age = fr_tcpclosewait;
+			state[dir] = TCPS_CLOSE_WAIT;
+		}
+		return;
+	}
+
+	*age = fr_tcptimeout; /* 1 min */
+
+	switch(state[dir])
+	{
+	case TCPS_CLOSED:
+		if ((flags & (TH_FIN|TH_SYN|TH_RST|TH_ACK)) == TH_ACK) {
+			state[dir] = TCPS_ESTABLISHED;
+			*age = fr_tcpidletimeout;
+		}
+	case TCPS_FIN_WAIT_2:
+		if ((flags & TH_OPENING) == TH_OPENING)
+			state[dir] = TCPS_SYN_RECEIVED;
+		else if (flags & TH_SYN)
+			state[dir] = TCPS_SYN_SENT;
+		break;
+	case TCPS_SYN_RECEIVED:
+	case TCPS_SYN_SENT:
+		if ((flags & (TH_FIN|TH_ACK)) == TH_ACK) {
+			state[dir] = TCPS_ESTABLISHED;
+			*age = fr_tcpidletimeout;
+		} else if ((flags & (TH_FIN|TH_ACK)) == (TH_FIN|TH_ACK)) {
+			state[dir] = TCPS_CLOSE_WAIT;
+			if (!(flags & TH_PUSH) && !dlen &&
+			    ostate > TCPS_ESTABLISHED)
+				*age  = fr_tcplastack;
+			else
+				*age  = fr_tcpclosewait;
+		}
+		break;
+	case TCPS_ESTABLISHED:
+		if (flags & TH_FIN) {
+			state[dir] = TCPS_CLOSE_WAIT;
+			if (!(flags & TH_PUSH) && !dlen &&
+			    ostate > TCPS_ESTABLISHED)
+				*age  = fr_tcplastack;
+			else
+				*age  = fr_tcpclosewait;
+		} else {
+			if (ostate < TCPS_CLOSE_WAIT)
+				*age = fr_tcpidletimeout;
+		}
+		break;
+	case TCPS_CLOSE_WAIT:
+		if ((flags & TH_FIN) && !(flags & TH_PUSH) && !dlen &&
+		    ostate > TCPS_ESTABLISHED) {
+			*age  = fr_tcplastack;
+			state[dir] = TCPS_LAST_ACK;
+		} else
+			*age  = fr_tcpclosewait;
+		break;
+	case TCPS_LAST_ACK:
+		if (flags & TH_ACK) {
+			state[dir] = TCPS_FIN_WAIT_2;
+			if (!(flags & TH_PUSH) && !dlen &&
+			    ostate > TCPS_ESTABLISHED)
+				*age  = fr_tcplastack;
+			else {
+				*age  = fr_tcpclosewait;
+				state[dir] = TCPS_CLOSE_WAIT;
+			}
+		}
+		break;
+	}
+}
+
+
+#ifdef	IPFILTER_LOG
+void ipstate_log(is, type)
+struct ipstate *is;
+u_int type;
+{
+	struct	ipslog	ipsl;
+	void *items[1];
+	size_t sizes[1];
+	int types[1];
+
+	ipsl.isl_type = type;
+	ipsl.isl_pkts = is->is_pkts;
+	ipsl.isl_bytes = is->is_bytes;
+	ipsl.isl_src = is->is_src;
+	ipsl.isl_dst = is->is_dst;
+	ipsl.isl_p = is->is_p;
+	ipsl.isl_flags = is->is_flags;
+	if (ipsl.isl_p == IPPROTO_TCP || ipsl.isl_p == IPPROTO_UDP) {
+		ipsl.isl_sport = is->is_sport;
+		ipsl.isl_dport = is->is_dport;
+		if (ipsl.isl_p == IPPROTO_TCP) {
+			ipsl.isl_state[0] = is->is_state[0];
+			ipsl.isl_state[1] = is->is_state[1];
+		}
+	} else if (ipsl.isl_p == IPPROTO_ICMP)
+		ipsl.isl_itype = is->is_icmp.ics_type;
+	else {
+		ipsl.isl_ps.isl_filler[0] = 0;
+		ipsl.isl_ps.isl_filler[1] = 0;
+	}
+	items[0] = &ipsl;
+	sizes[0] = sizeof(ipsl);
+	types[0] = 0;
+
+	(void) ipllog(IPL_LOGSTATE, NULL, items, sizes, types, 1);
+}
+#endif
diff --git a/sys/contrib/ipfilter/netinet/ip_state.h b/sys/contrib/ipfilter/netinet/ip_state.h
new file mode 100644
index 0000000..1b7c392
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ip_state.h
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 1995-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_state.h	1.3 1/12/96 (C) 1995 Darren Reed
+ * $Id: ip_state.h,v 2.1 1999/08/04 17:30:00 darrenr Exp $
+ * $FreeBSD$
+ */
+#ifndef	__IP_STATE_H__
+#define	__IP_STATE_H__
+
+#define	IPSTATE_SIZE	257
+#define	IPSTATE_MAX	2048	/* Maximum number of states held */
+
+#define	PAIRS(s1,d1,s2,d2)	((((s1) == (s2)) && ((d1) == (d2))) ||\
+				 (((s1) == (d2)) && ((d1) == (s2))))
+#define	IPPAIR(s1,d1,s2,d2)	PAIRS((s1).s_addr, (d1).s_addr, \
+				      (s2).s_addr, (d2).s_addr)
+
+
+typedef struct udpstate {
+	u_short	us_sport;
+	u_short	us_dport;
+} udpstate_t;
+
+typedef struct icmpstate {
+	u_short	ics_id;
+	u_short	ics_seq;
+	u_char	ics_type;
+} icmpstate_t;
+
+typedef	struct	tcpdata	{
+	u_32_t	td_end;
+	u_32_t	td_maxend;
+	u_short	td_maxwin;
+} tcpdata_t;
+
+typedef	struct tcpstate {
+	u_short	ts_sport;
+	u_short	ts_dport;
+	tcpdata_t ts_data[2];
+	u_char	ts_state[2];
+} tcpstate_t;
+
+typedef struct ipstate {
+	struct	ipstate	*is_next;
+	u_long	is_age;
+	u_int	is_pass;
+	U_QUAD_T	is_pkts;
+	U_QUAD_T	is_bytes;
+	void	*is_ifpin;
+	void	*is_ifpout;
+	frentry_t	*is_rule;
+	struct	in_addr	is_src;
+	struct	in_addr	is_dst;
+	u_char	is_p;			/* Protocol */
+	u_char	is_rout;		/* Is rule in/out ? */
+	u_32_t	is_flags;
+	u_32_t	is_opt;			/* packet options set */
+	u_32_t	is_optmsk;		/*    "      "    mask */
+	u_short	is_sec;			/* security options set */
+	u_short	is_secmsk;		/*    "        "    mask */
+	u_short	is_auth;		/* authentication options set */
+	u_short	is_authmsk;		/*    "              "    mask */
+	union {
+		icmpstate_t	is_ics;
+		tcpstate_t	is_ts;
+		udpstate_t	is_us;
+	} is_ps;
+} ipstate_t;
+
+#define	is_icmp	is_ps.is_ics
+#define	is_type	is_icmp.ics_type
+#define	is_code	is_icmp.ics_code
+#define	is_tcp	is_ps.is_ts
+#define	is_udp	is_ps.is_us
+#define is_send	is_tcp.ts_data[0].td_end
+#define is_dend	is_tcp.ts_data[1].td_end
+#define is_maxswin	is_tcp.ts_data[0].td_maxwin
+#define is_maxdwin	is_tcp.ts_data[1].td_maxwin
+#define is_maxsend	is_tcp.ts_data[0].td_maxend
+#define is_maxdend	is_tcp.ts_data[1].td_maxend
+#define	is_sport	is_tcp.ts_sport
+#define	is_dport	is_tcp.ts_dport
+#define	is_state	is_tcp.ts_state
+
+#define	TH_OPENING	(TH_SYN|TH_ACK)
+/*
+ * is_flags:
+ * Bits 0 - 3 are use as a mask with the current packet's bits to check for
+ * whether it is short, tcp/udp, a fragment or the presence of IP options.
+ * Bits 4 - 7 are set from the initial packet and contain what the packet
+ * anded with bits 0-3 must match.
+ * Bits 8,9 are used to indicate wildcard source/destination port matching.
+ */
+
+
+typedef	struct	ipslog	{
+	U_QUAD_T	isl_pkts;
+	U_QUAD_T	isl_bytes;
+	struct	in_addr	isl_src;
+	struct	in_addr	isl_dst;
+	u_char	isl_p;
+	u_char	isl_flags;
+	u_char	isl_state[2];
+	u_short	isl_type;
+	union {
+		u_short	isl_filler[2];
+		u_short	isl_ports[2];
+		u_short	isl_icmp;
+	} isl_ps;
+} ipslog_t;
+
+#define	isl_sport	isl_ps.isl_ports[0]
+#define	isl_dport	isl_ps.isl_ports[1]
+#define	isl_itype	isl_ps.isl_icmp
+
+#define	ISL_NEW		0
+#define	ISL_EXPIRE	0xffff
+#define	ISL_FLUSH	0xfffe
+
+
+typedef	struct	ips_stat {
+	u_long	iss_hits;
+	u_long	iss_miss;
+	u_long	iss_max;
+	u_long	iss_tcp;
+	u_long	iss_udp;
+	u_long	iss_icmp;
+	u_long	iss_nomem;
+	u_long	iss_expire;
+	u_long	iss_fin;
+	u_long	iss_active;
+	u_long	iss_logged;
+	u_long	iss_logfail;
+	u_long	iss_inuse;
+	ipstate_t **iss_table;
+} ips_stat_t;
+
+
+extern	u_long	fr_tcpidletimeout;
+extern	u_long	fr_tcpclosewait;
+extern	u_long	fr_tcplastack;
+extern	u_long	fr_tcptimeout;
+extern	u_long	fr_tcpclosed;
+extern	u_long	fr_udptimeout;
+extern	u_long	fr_icmptimeout;
+extern	int	fr_stateinit __P((void));
+extern	int	fr_tcpstate __P((ipstate_t *, fr_info_t *, ip_t *, tcphdr_t *));
+extern	ipstate_t	*fr_addstate __P((ip_t *, fr_info_t *, u_int));
+extern	frentry_t	*fr_checkstate __P((ip_t *, fr_info_t *));
+extern	void	fr_timeoutstate __P((void));
+extern	void	fr_tcp_age __P((u_long *, u_char *, ip_t *, fr_info_t *, int));
+extern	void	fr_stateunload __P((void));
+extern	void	ipstate_log __P((struct ipstate *, u_int));
+#if defined(__NetBSD__) || defined(__OpenBSD__)
+extern	int	fr_state_ioctl __P((caddr_t, u_long, int));
+#else
+extern	int	fr_state_ioctl __P((caddr_t, int, int));
+#endif
+
+#endif /* __IP_STATE_H__ */
diff --git a/sys/contrib/ipfilter/netinet/ipl.h b/sys/contrib/ipfilter/netinet/ipl.h
new file mode 100644
index 0000000..f29b6fd
--- /dev/null
+++ b/sys/contrib/ipfilter/netinet/ipl.h
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 1993-1999 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ipl.h	1.21 6/5/96
+ * $Id$
+ * $FreeBSD$
+ */
+
+#ifndef	__IPL_H__
+#define	__IPL_H__
+
+#define	IPL_VERSION	"IP Filter: v3.3.3"
+
+#endif