Replacement import of ipfilter 3.1.7 components used in kernel.

(This is to repair the vendor branching)

1 files changed, 762 insertions, 0 deletions

diff --git a/sys/netinet/fil.c b/sys/netinet/fil.c
new file mode 100644
index 0000000..de776f9
--- /dev/null
+++ b/sys/netinet/fil.c
@@ -0,0 +1,762 @@
+/*
+ * (C)opyright 1993-1996 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) && defined(LIBC_SCCS)
+static	char	sccsid[] = "@(#)fil.c	1.36 6/5/96 (C) 1993-1996 Darren Reed";
+static	char	rcsid[] = "$Id: fil.c,v 2.0.1.4 1997/02/04 13:59:41 darrenr Exp $";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#if defined(_KERNEL) || defined(KERNEL)
+# include <sys/systm.h>
+#else
+# include <stdio.h>
+# include <string.h>
+#endif
+#include <sys/uio.h>
+#if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+#else
+# include <sys/byteorder.h>
+# include <sys/dditypes.h>
+# include <sys/stream.h>
+#endif
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#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/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_nat.h"
+#include "ip_frag.h"
+#include "ip_state.h"
+#ifndef	MIN
+#define	MIN(a,b)	(((a)<(b))?(a):(b))
+#endif
+
+#ifndef	_KERNEL
+#include "ipf.h"
+extern	int	opts;
+extern	void	debug(), verbose();
+
+#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	FR_SCANLIST(p, ip, fi, m)	fr_scanlist(p, ip, fi)
+# if SOLARIS
+#  define	bcmp	memcmp
+# endif
+#else
+#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	FR_SCANLIST(p, ip, fi, m)	fr_scanlist(p, ip, fi, m)
+extern	int	send_reset();
+# if SOLARIS
+extern	int	icmp_error(), ipfr_fastroute();
+extern	kmutex_t	ipf_mutex, ipl_mutex;
+# else
+extern	void	ipfr_fastroute();
+# endif
+extern	int	ipl_unreach, ipllog();
+#endif
+
+#if SOLARIS
+# define	SEND_RESET(ip, if, q)		send_reset(ip, qif, q)
+# define	ICMP_ERROR(b, ip, t, c, if, src) \
+			icmp_error(b, ip, t, c, if, src)
+#else
+# define	SEND_RESET(ip, if, q)		send_reset(ip)
+# if BSD < 199103
+#  define	ICMP_ERROR(b, ip, t, c, if, src) \
+			icmp_error(mtod(b, ip_t *), t, c, if, src)
+# else
+#  define	ICMP_ERROR(b, ip, t, c, if, src) \
+			icmp_error(b, t, c, (src).s_addr, if)
+# endif
+#endif
+
+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 } };
+int	fr_flags = 0, fr_active = 0;
+
+fr_info_t	frcache[2];
+
+
+/*
+ * 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_fr = NULL;
+	fin->fin_tcpf = 0;
+	fin->fin_data[0] = 0;
+	fin->fin_data[1] = 0;
+	fin->fin_rule = -1;
+#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));
+	(*(((u_long *)fi) + 1)) = (*(((u_long *)ip) + 3));
+	(*(((u_long *)fi) + 2)) = (*(((u_long *)ip) + 4));
+
+	fi->fi_fl = (hlen > sizeof(struct ip)) ? FI_OPTIONS : 0;
+	off = (ip->ip_off & 0x1fff) << 3;
+	if (ip->ip_off & 0x3fff)
+		fi->fi_fl |= FI_FRAG;
+	switch (ip->ip_p)
+	{
+	case IPPROTO_ICMP :
+		if ((!IPMINLEN(ip, icmp) && !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 -= sizeof(*ip); hlen; ) {
+		if (!(opt = *s))
+			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.
+ */
+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_tcpf &&
+		    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)
+int 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;
+
+	fr = fin->fin_fr;
+	fin->fin_fr = NULL;
+	fin->fin_rule = 0;
+	off = ip->ip_off & 0x1fff;
+	pass |= (fi->fi_fl << 20);
+
+	if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
+		portcmp = 1;
+
+	for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
+		/*
+		 * 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 (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' : 'b'));
+		if (fin->fin_ifp && *fr->fr_ifname &&
+		    strcasecmp((char *)fin->fin_ifp, fr->fr_ifname))
+			continue;
+		FR_VERBOSE((":i"));
+#endif
+		{
+			register u_long	*ld, *lm, *lip;
+			register int i;
+
+			lip = (u_long *)fi;
+			lm = (u_long *)&fr->fr_mip;
+			ld = (u_long *)&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]);
+			FR_IFDEBUG(i,continue,("1. %#08x & %#08x != %#08x\n",
+				   lip[1], lm[1], ld[1]));
+			i |= ((lip[2] & lm[2]) != ld[2]);
+			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 (fi->fi_fl & FI_TCPUDP) {
+			if (portcmp) {
+				if (!fr_tcpudpchk(fr, fin))
+					continue;
+			} else if (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
+				   fr->fr_tcpfm)
+				continue;
+		} else if (fi->fi_p == IPPROTO_ICMP) {
+			if (!off && (fin->fin_dlen > 1)) {
+				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;
+				}
+			} else if (fr->fr_icmpm || fr->fr_icmp)
+				continue;
+		}
+		FR_VERBOSE(("*"));
+		/*
+		 * Just log this packet...
+		 */
+		pass = fr->fr_flags;
+		if ((pass & FR_CALLNOW) && fr->fr_func)
+			pass = (*fr->fr_func)(pass, ip, fin);
+#ifdef  IPFILTER_LOG
+		if ((pass & FR_LOGMASK) == FR_LOG) {
+			if (!ipllog(fr->fr_flags, ip, fin, m))
+				frstats[fin->fin_out].fr_skip++;
+			frstats[fin->fin_out].fr_pkl++;
+		}
+#endif /* IPFILTER_LOG */
+		FR_DEBUG(("pass %#x\n", pass));
+		fr->fr_hits++;
+		if (pass & FR_ACCOUNT)
+			fr->fr_bytes += ip->ip_len;
+		else
+			fin->fin_icode = fr->fr_icode;
+		fin->fin_rule = rulen;
+		fin->fin_fr = fr;
+		if (pass & FR_QUICK)
+			break;
+	}
+	return pass;
+}
+
+
+/*
+ * frcheck - filter check
+ * check using source and destination addresses/pors in a packet whether
+ * or not to pass it on or not.
+ */
+int fr_check(ip, hlen, ifp, out
+#ifdef _KERNEL
+# if SOLARIS
+, qif, q, mp)
+qif_t *qif;
+queue_t *q;
+mblk_t **mp;
+# else
+, mp)
+struct mbuf **mp;
+# endif
+#else
+)
+#endif
+ip_t *ip;
+int hlen;
+struct ifnet *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 pass, changed;
+
+#if !defined(__SVR4) && !defined(__svr4__) && defined(_KERNEL)
+	register struct mbuf *m = *mp;
+	struct mbuf *mc = NULL;
+
+	if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ||
+	     ip->ip_p == IPPROTO_ICMP)) {
+		register int up = MIN(hlen + 8, ip->ip_len);
+
+		if (up > m->m_len) {
+			if ((*mp = m_pullup(m, up)) == 0) {
+				frstats[out].fr_pull[1]++;
+				return -1;
+			} else {
+				frstats[out].fr_pull[0]++;
+				m = *mp;
+				ip = mtod(m, struct ip *);
+			}
+		}
+	}
+#endif
+#if SOLARIS && defined(_KERNEL)
+	mblk_t *mc = NULL, *m = qif->qf_m;
+#endif
+	fr_makefrip(hlen, ip, fin);
+	fin->fin_ifp = ifp;
+	fin->fin_out = out;
+
+	MUTEX_ENTER(&ipf_mutex);
+	if (!out) {
+		changed = ip_natin(ip, hlen, fin);
+		if ((fin->fin_fr = ipacct[0][fr_active]) &&
+		    (FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
+			frstats[0].fr_acct++;
+	}
+
+	if ((pass = ipfr_knownfrag(ip, fin))) {
+		if ((pass & FR_KEEPSTATE)) {
+			if (fr_addstate(ip, fin, pass) == -1)
+				frstats[out].fr_bads++;
+			else
+				frstats[out].fr_ads++;
+		}
+	} else if ((pass = fr_checkstate(ip, fin))) {
+		if ((pass & FR_KEEPFRAG)) {
+			if (fin->fin_fi.fi_fl & FI_FRAG) {
+				if (ipfr_newfrag(ip, fin, pass) == -1)
+					frstats[out].fr_bnfr++;
+				else
+					frstats[out].fr_nfr++;
+			} else
+				frstats[out].fr_cfr++;
+		}
+	} else {
+		fc = frcache + out;
+		if (fc->fin_fr && !bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
+			/*
+			 * copy cached data so we can unlock the mutex
+			 * earlier.
+			 */
+			bcopy((char *)fc, (char *)fin, sizeof(*fin));
+			frstats[out].fr_chit++;
+			pass = fin->fin_fr->fr_flags;
+		} else {
+			pass = FR_NOMATCH;
+			if ((fin->fin_fr = ipfilter[out][fr_active]))
+				pass = FR_SCANLIST(FR_NOMATCH, ip, fin, m);
+			bcopy((char *)fin, (char *)fc, FI_CSIZE);
+			if (pass & FR_NOMATCH) {
+				frstats[out].fr_nom++;
+#ifdef	NOMATCH
+				pass |= NOMATCH;
+#endif
+			}
+		}
+		fr = fin->fin_fr;
+
+		if ((pass & FR_KEEPFRAG)) {
+			if (fin->fin_fi.fi_fl & FI_FRAG) {
+				if (ipfr_newfrag(ip, fin, pass) == -1)
+					frstats[out].fr_bnfr++;
+				else
+					frstats[out].fr_nfr++;
+			} else
+				frstats[out].fr_cfr++;
+		}
+		if (pass & FR_KEEPSTATE) {
+			if (fr_addstate(ip, fin, pass) == -1)
+				frstats[out].fr_bads++;
+			else
+				frstats[out].fr_ads++;
+		}
+	}
+
+	if (fr && fr->fr_func)
+		pass = (*fr->fr_func)(pass, ip, fin);
+
+	if (out) {
+		if ((fin->fin_fr = ipacct[1][fr_active]) &&
+		    (FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
+			frstats[1].fr_acct++;
+		fin->fin_fr = NULL;
+		changed = ip_natout(ip, hlen, fin);
+	}
+	fin->fin_fr = fr;
+	MUTEX_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;
+			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;
+			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;
+			frstats[out].fr_bpkl++;
+logit:
+			if (!ipllog(pass, ip, fin, m)) {
+				frstats[out].fr_skip++;
+				if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
+				    (FR_PASS|FR_LOGORBLOCK))
+					pass ^= FR_PASS|FR_BLOCK;
+			}
+		}
+	}
+#endif /* IPFILTER_LOG */
+
+	if (pass & FR_PASS)
+		frstats[out].fr_pass++;
+	else if (pass & FR_BLOCK) {
+		frstats[out].fr_block++;
+		/*
+		 * Should we return an ICMP packet to indicate error
+		 * status passing through the packet filter ?
+		 */
+#ifdef	_KERNEL
+		if (pass & FR_RETICMP) {
+# if SOLARIS
+			ICMP_ERROR(q, ip, ICMP_UNREACH, fin->fin_icode,
+				   qif, ip->ip_src);
+# else
+			ICMP_ERROR(m, ip, ICMP_UNREACH, fin->fin_icode,
+				   ifp, ip->ip_src);
+			m = NULL;	/* freed by icmp_error() */
+# endif
+
+			frstats[0].fr_ret++;
+		} else if ((pass & FR_RETRST) &&
+			   !(fin->fin_fi.fi_fl & FI_SHORT)) {
+			if (SEND_RESET(ip, qif, q) == 0)
+				frstats[1].fr_ret++;
+		}
+#else
+		if (pass & FR_RETICMP) {
+			verbose("- ICMP unreachable sent\n");
+			frstats[0].fr_ret++;
+		} else if ((pass & FR_RETRST) &&
+			   !(fin->fin_fi.fi_fl & FI_SHORT)) {
+			verbose("- TCP RST sent\n");
+			frstats[1].fr_ret++;
+		}
+#endif
+	}
+#ifdef	_KERNEL
+# if	!SOLARIS
+	if (pass & FR_DUP)
+		mc = m_copy(m, 0, M_COPYALL);
+	if (fr) {
+		frdest_t *fdp = &fr->fr_tif;
+
+		if ((pass & FR_FASTROUTE) ||
+		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+			ipfr_fastroute(m, fin, fdp);
+			m = *mp = NULL;
+			pass = 0;
+		}
+		if (mc)
+			ipfr_fastroute(mc, fin, &fr->fr_dif);
+	}
+	if (!(pass & FR_PASS) && m)
+		m_freem(m);
+	return (pass & FR_PASS) ? 0 : -1;
+# else
+	if (pass & FR_DUP)
+		mc = dupmsg(m);
+	if (fr) {
+		frdest_t *fdp = &fr->fr_tif;
+
+		if ((pass & FR_FASTROUTE) ||
+		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+			ipfr_fastroute(qif, ip, m, mp, fin, fdp);
+			m = *mp = NULL;
+		}
+		if (mc)
+			ipfr_fastroute(qif, ip, mc, mp, fin, &fr->fr_dif);
+	}
+	return (pass & FR_PASS) ? changed : -1;
+# endif
+#else
+	if (pass & FR_NOMATCH)
+		return 1;
+	if (pass & FR_PASS)
+		return 0;
+	return -1;
+#endif
+}
+
+
+#ifdef	IPFILTER_LOG
+# if !(defined(_KERNEL))
+static void ipllog()
+{
+	verbose("l");
+}
+# endif
+
+
+int fr_copytolog(buf, len)
+char *buf;
+int len;
+{
+	int	clen, tail;
+
+	tail = (iplh >= iplt) ? (iplbuf + IPLLOGSIZE - iplh) : (iplt - iplh);
+	clen = MIN(tail, len);
+	bcopy(buf, iplh, clen);
+	len -= clen;
+	tail -= clen;
+	iplh += clen;
+	buf += clen;
+	if (iplh == iplbuf + IPLLOGSIZE) {
+		iplh = iplbuf;
+		tail = iplt - iplh;
+	}
+	if (len && tail) {
+		clen = MIN(tail, len);
+		bcopy(buf, iplh, clen);
+		len -= clen;
+		iplh += clen;
+	}
+	return len;
+}
+#endif