diff options
Diffstat (limited to 'contrib/ipfilter/fil.c')
| -rw-r--r-- | contrib/ipfilter/fil.c | 6209 |
1 files changed, 0 insertions, 6209 deletions
diff --git a/contrib/ipfilter/fil.c b/contrib/ipfilter/fil.c deleted file mode 100644 index 6f3a13d..0000000 --- a/contrib/ipfilter/fil.c +++ /dev/null @@ -1,6209 +0,0 @@ -/* $NetBSD$ */ - -/* - * Copyright (C) 1993-2003 by Darren Reed. - * - * See the IPFILTER.LICENCE file for details on licencing. - */ -#if defined(KERNEL) || defined(_KERNEL) -# undef KERNEL -# undef _KERNEL -# define KERNEL 1 -# define _KERNEL 1 -#endif -#include <sys/errno.h> -#include <sys/types.h> -#include <sys/param.h> -#include <sys/time.h> -#if defined(__NetBSD__) -# if (NetBSD >= 199905) && !defined(IPFILTER_LKM) && defined(_KERNEL) -# include "opt_ipfilter_log.h" -# endif -#endif -#if defined(_KERNEL) && defined(__FreeBSD_version) && \ - (__FreeBSD_version >= 220000) -# if (__FreeBSD_version >= 400000) -# if !defined(IPFILTER_LKM) -# include "opt_inet6.h" -# endif -# if (__FreeBSD_version == 400019) -# define CSUM_DELAY_DATA -# endif -# endif -# include <sys/filio.h> -#else -# include <sys/ioctl.h> -#endif -#include <sys/fcntl.h> -#if defined(_KERNEL) -# include <sys/systm.h> -# include <sys/file.h> -#else -# include <stdio.h> -# include <string.h> -# include <stdlib.h> -# include <stddef.h> -# include <sys/file.h> -# define _KERNEL -# ifdef __OpenBSD__ -struct file; -# endif -# include <sys/uio.h> -# undef _KERNEL -#endif -#if !defined(__SVR4) && !defined(__svr4__) && !defined(__hpux) && \ - !defined(linux) -# include <sys/mbuf.h> -#else -# if !defined(linux) -# include <sys/byteorder.h> -# endif -# if (SOLARIS2 < 5) && defined(sun) -# include <sys/dditypes.h> -# endif -#endif -#ifdef __hpux -# define _NET_ROUTE_INCLUDED -#endif -#if !defined(linux) -# include <sys/protosw.h> -#endif -#include <sys/socket.h> -#include <net/if.h> -#ifdef sun -# include <net/af.h> -#endif -#if !defined(_KERNEL) && defined(__FreeBSD__) -# include "radix_ipf.h" -#endif -#include <net/route.h> -#include <netinet/in.h> -#include <netinet/in_systm.h> -#include <netinet/ip.h> -#if !defined(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> -#if !defined(__sgi) || defined(_KERNEL) -# include <netinet/udp.h> -# include <netinet/ip_icmp.h> -#endif -#ifdef __hpux -# undef _NET_ROUTE_INCLUDED -#endif -#include "netinet/ip_compat.h" -#ifdef USE_INET6 -# include <netinet/icmp6.h> -# if !SOLARIS && defined(_KERNEL) && !defined(__osf__) && !defined(__hpux) -# include <netinet6/in6_var.h> -# endif -#endif -#include <netinet/tcpip.h> -#include "netinet/ip_fil.h" -#include "netinet/ip_nat.h" -#include "netinet/ip_frag.h" -#include "netinet/ip_state.h" -#include "netinet/ip_proxy.h" -#include "netinet/ip_auth.h" -#ifdef IPFILTER_SCAN -# include "netinet/ip_scan.h" -#endif -#ifdef IPFILTER_SYNC -# include "netinet/ip_sync.h" -#endif -#include "netinet/ip_pool.h" -#include "netinet/ip_htable.h" -#ifdef IPFILTER_COMPILED -# include "netinet/ip_rules.h" -#endif -#if defined(IPFILTER_BPF) && defined(_KERNEL) -# include <net/bpf.h> -#endif -#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) -# include <sys/malloc.h> -# if defined(_KERNEL) && !defined(IPFILTER_LKM) -# include "opt_ipfilter.h" -# endif -#endif -#include "netinet/ipl.h" -/* END OF INCLUDES */ - -#if !defined(lint) -static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed"; -static const char rcsid[] = "@(#)Id: fil.c,v 2.243.2.57 2005/03/28 10:47:50 darrenr Exp"; -#endif - -#ifndef _KERNEL -# include "ipf.h" -# include "ipt.h" -# include "bpf-ipf.h" -extern int opts; - -# define FR_VERBOSE(verb_pr) verbose verb_pr -# define FR_DEBUG(verb_pr) debug verb_pr -#else /* #ifndef _KERNEL */ -# define FR_VERBOSE(verb_pr) -# define FR_DEBUG(verb_pr) -#endif /* _KERNEL */ - - -fr_info_t frcache[2][8]; -struct filterstats frstats[2] = { { 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0 } }; -struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } }, - *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } }, - *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } }, - *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } }, - *ipnatrules[2][2] = { { NULL, NULL }, { NULL, NULL } }; -struct frgroup *ipfgroups[IPL_LOGSIZE][2]; -char ipfilter_version[] = IPL_VERSION; -int fr_refcnt = 0; -/* - * For fr_running: - * 0 == loading, 1 = running, -1 = disabled, -2 = unloading - */ -int fr_running = 0; -int fr_flags = IPF_LOGGING; -int fr_active = 0; -int fr_control_forwarding = 0; -int fr_update_ipid = 0; -u_short fr_ip_id = 0; -int fr_chksrc = 0; /* causes a system crash if enabled */ -int fr_minttl = 4; -u_long fr_frouteok[2] = {0, 0}; -u_long fr_userifqs = 0; -u_long fr_badcoalesces[2] = {0, 0}; -u_char ipf_iss_secret[32]; -#if defined(IPFILTER_DEFAULT_BLOCK) -int fr_pass = FR_BLOCK|FR_NOMATCH; -#else -int fr_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH; -#endif -int fr_features = 0 -#ifdef IPFILTER_LKM - | IPF_FEAT_LKM -#endif -#ifdef IPFILTER_LOG - | IPF_FEAT_LOG -#endif -#ifdef IPFILTER_LOOKUP - | IPF_FEAT_LOOKUP -#endif -#ifdef IPFILTER_BPF - | IPF_FEAT_BPF -#endif -#ifdef IPFILTER_COMPILED - | IPF_FEAT_COMPILED -#endif -#ifdef IPFILTER_CKSUM - | IPF_FEAT_CKSUM -#endif -#ifdef IPFILTER_SYNC - | IPF_FEAT_SYNC -#endif -#ifdef IPFILTER_SCAN - | IPF_FEAT_SCAN -#endif -#ifdef USE_INET6 - | IPF_FEAT_IPV6 -#endif - ; - -static INLINE int fr_ipfcheck __P((fr_info_t *, frentry_t *, int)); -static int fr_portcheck __P((frpcmp_t *, u_short *)); -static int frflushlist __P((int, minor_t, int *, frentry_t **)); -static ipfunc_t fr_findfunc __P((ipfunc_t)); -static frentry_t *fr_firewall __P((fr_info_t *, u_32_t *)); -static int fr_funcinit __P((frentry_t *fr)); -static INLINE void frpr_esp __P((fr_info_t *)); -static INLINE void frpr_gre __P((fr_info_t *)); -static INLINE void frpr_udp __P((fr_info_t *)); -static INLINE void frpr_tcp __P((fr_info_t *)); -static INLINE void frpr_icmp __P((fr_info_t *)); -static INLINE void frpr_ipv4hdr __P((fr_info_t *)); -static INLINE int frpr_pullup __P((fr_info_t *, int)); -static INLINE void frpr_short __P((fr_info_t *, int)); -static INLINE void frpr_tcpcommon __P((fr_info_t *)); -static INLINE void frpr_udpcommon __P((fr_info_t *)); -static INLINE int fr_updateipid __P((fr_info_t *)); -#ifdef IPFILTER_LOOKUP -static int fr_grpmapinit __P((frentry_t *fr)); -static INLINE void *fr_resolvelookup __P((u_int, u_int, lookupfunc_t *)); -#endif -static void frsynclist __P((frentry_t *, void *)); -static ipftuneable_t *fr_findtunebyname __P((char *)); -static ipftuneable_t *fr_findtunebycookie __P((void *, void **)); - - -/* - * bit values for identifying presence of individual IP options - * All of these tables should be ordered by increasing key value on the left - * hand side to allow for binary searching of the array and include a trailer - * with a 0 for the bitmask for linear searches to easily find the end with. - */ -const 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 } -}; - -#ifdef USE_INET6 -struct optlist ip6exthdr[] = { - { IPPROTO_HOPOPTS, 0x000001 }, - { IPPROTO_IPV6, 0x000002 }, - { IPPROTO_ROUTING, 0x000004 }, - { IPPROTO_FRAGMENT, 0x000008 }, - { IPPROTO_ESP, 0x000010 }, - { IPPROTO_AH, 0x000020 }, - { IPPROTO_NONE, 0x000040 }, - { IPPROTO_DSTOPTS, 0x000080 }, - { 0, 0 } -}; -#endif - -struct optlist tcpopts[] = { - { TCPOPT_NOP, 0x000001 }, - { TCPOPT_MAXSEG, 0x000002 }, - { TCPOPT_WINDOW, 0x000004 }, - { TCPOPT_SACK_PERMITTED, 0x000008 }, - { TCPOPT_SACK, 0x000010 }, - { TCPOPT_TIMESTAMP, 0x000020 }, - { 0, 0x000000 } -}; - -/* - * bit values for identifying presence of individual IP security options - */ -const 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 } -}; - - -/* - * Table of functions available for use with call rules. - */ -static ipfunc_resolve_t fr_availfuncs[] = { -#ifdef IPFILTER_LOOKUP - { "fr_srcgrpmap", fr_srcgrpmap, fr_grpmapinit }, - { "fr_dstgrpmap", fr_dstgrpmap, fr_grpmapinit }, -#endif - { "", NULL } -}; - - -/* - * The next section of code is a a collection of small routines that set - * fields in the fr_info_t structure passed based on properties of the - * current packet. There are different routines for the same protocol - * for each of IPv4 and IPv6. Adding a new protocol, for which there - * will "special" inspection for setup, is now more easily done by adding - * a new routine and expanding the frpr_ipinit*() function rather than by - * adding more code to a growing switch statement. - */ -#ifdef USE_INET6 -static INLINE void frpr_udp6 __P((fr_info_t *)); -static INLINE void frpr_tcp6 __P((fr_info_t *)); -static INLINE void frpr_icmp6 __P((fr_info_t *)); -static INLINE void frpr_ipv6hdr __P((fr_info_t *)); -static INLINE void frpr_short6 __P((fr_info_t *, int)); -static INLINE int frpr_hopopts6 __P((fr_info_t *)); -static INLINE int frpr_routing6 __P((fr_info_t *)); -static INLINE int frpr_dstopts6 __P((fr_info_t *)); -static INLINE int frpr_fragment6 __P((fr_info_t *)); - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_short6 */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* This is function enforces the 'is a packet too short to be legit' rule */ -/* for IPv6 and marks the packet with FI_SHORT if so. See function comment */ -/* for frpr_short() for more details. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_short6(fin, min) -fr_info_t *fin; -int min; -{ - fr_ip_t *fi = &fin->fin_fi; - int off; - - off = fin->fin_off; - if (off == 0) { - if (fin->fin_plen < fin->fin_hlen + min) - fi->fi_flx |= FI_SHORT; - } else if (off < min) { - fi->fi_flx |= FI_SHORT; - } -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_ipv6hdr */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* Copy values from the IPv6 header into the fr_info_t struct and call the */ -/* per-protocol analyzer if it exists. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_ipv6hdr(fin) -fr_info_t *fin; -{ - int p, go = 1, i, hdrcount, coalesced; - ip6_t *ip6 = (ip6_t *)fin->fin_ip; - fr_ip_t *fi = &fin->fin_fi; - - fin->fin_off = 0; - - fi->fi_tos = 0; - fi->fi_optmsk = 0; - fi->fi_secmsk = 0; - fi->fi_auth = 0; - - coalesced = (fin->fin_flx & FI_COALESCE) ? 1 : 0; - p = ip6->ip6_nxt; - fi->fi_ttl = ip6->ip6_hlim; - fi->fi_src.in6 = ip6->ip6_src; - fi->fi_dst.in6 = ip6->ip6_dst; - fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff); - - hdrcount = 0; - while (go && !(fin->fin_flx & (FI_BAD|FI_SHORT))) { - switch (p) - { - case IPPROTO_UDP : - frpr_udp6(fin); - go = 0; - break; - - case IPPROTO_TCP : - frpr_tcp6(fin); - go = 0; - break; - - case IPPROTO_ICMPV6 : - frpr_icmp6(fin); - go = 0; - break; - - case IPPROTO_GRE : - frpr_gre(fin); - go = 0; - break; - - case IPPROTO_HOPOPTS : - /* - * Actually, hop by hop header is only allowed right - * after IPv6 header! - */ - if (hdrcount != 0) - fin->fin_flx |= FI_BAD; - - if (coalesced == 0) { - coalesced = fr_coalesce(fin); - if (coalesced != 1) - return; - } - p = frpr_hopopts6(fin); - break; - - case IPPROTO_DSTOPTS : - if (coalesced == 0) { - coalesced = fr_coalesce(fin); - if (coalesced != 1) - return; - } - p = frpr_dstopts6(fin); - break; - - case IPPROTO_ROUTING : - if (coalesced == 0) { - coalesced = fr_coalesce(fin); - if (coalesced != 1) - return; - } - p = frpr_routing6(fin); - break; - - case IPPROTO_ESP : - frpr_esp(fin); - /*FALLTHROUGH*/ - case IPPROTO_AH : - case IPPROTO_IPV6 : - for (i = 0; ip6exthdr[i].ol_bit != 0; i++) - if (ip6exthdr[i].ol_val == p) { - fin->fin_flx |= ip6exthdr[i].ol_bit; - break; - } - go = 0; - break; - - case IPPROTO_NONE : - go = 0; - break; - - case IPPROTO_FRAGMENT : - if (coalesced == 0) { - coalesced = fr_coalesce(fin); - if (coalesced != 1) - return; - } - p = frpr_fragment6(fin); - break; - - default : - go = 0; - break; - } - hdrcount++; - - /* - * It is important to note that at this point, for the - * extension headers (go != 0), the entire header may not have - * been pulled up when the code gets to this point. This is - * only done for "go != 0" because the other header handlers - * will all pullup their complete header and the other - * indicator of an incomplete header is that this eas just an - * extension header. - */ - if ((go != 0) && (p != IPPROTO_NONE) && - (frpr_pullup(fin, 0) == -1)) { - p = IPPROTO_NONE; - go = 0; - } - } - fi->fi_p = p; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_hopopts6 */ -/* Returns: int - value of the next header or IPPROTO_NONE if error */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* This is function checks pending hop by hop options extension header */ -/* ------------------------------------------------------------------------ */ -static INLINE int frpr_hopopts6(fin) -fr_info_t *fin; -{ - struct ip6_ext *hdr; - u_short shift; - int i; - - fin->fin_flx |= FI_V6EXTHDR; - - /* 8 is default length of extension hdr */ - if ((fin->fin_dlen - 8) < 0) { - fin->fin_flx |= FI_SHORT; - return IPPROTO_NONE; - } - - if (frpr_pullup(fin, 8) == -1) - return IPPROTO_NONE; - - hdr = fin->fin_dp; - shift = 8 + (hdr->ip6e_len << 3); - if (shift > fin->fin_dlen) { /* Nasty extension header length? */ - fin->fin_flx |= FI_BAD; - return IPPROTO_NONE; - } - - for (i = 0; ip6exthdr[i].ol_bit != 0; i++) - if (ip6exthdr[i].ol_val == IPPROTO_HOPOPTS) { - fin->fin_optmsk |= ip6exthdr[i].ol_bit; - break; - } - - fin->fin_dp = (char *)fin->fin_dp + shift; - fin->fin_dlen -= shift; - - return hdr->ip6e_nxt; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_routing6 */ -/* Returns: int - value of the next header or IPPROTO_NONE if error */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* This is function checks pending routing extension header */ -/* ------------------------------------------------------------------------ */ -static INLINE int frpr_routing6(fin) -fr_info_t *fin; -{ - struct ip6_ext *hdr; - u_short shift; - int i; - - fin->fin_flx |= FI_V6EXTHDR; - - /* 8 is default length of extension hdr */ - if ((fin->fin_dlen - 8) < 0) { - fin->fin_flx |= FI_SHORT; - return IPPROTO_NONE; - } - - if (frpr_pullup(fin, 8) == -1) - return IPPROTO_NONE; - hdr = fin->fin_dp; - - shift = 8 + (hdr->ip6e_len << 3); - /* - * Nasty extension header length? - */ - if ((shift > fin->fin_dlen) || (shift < sizeof(struct ip6_hdr)) || - ((shift - sizeof(struct ip6_hdr)) & 15)) { - fin->fin_flx |= FI_BAD; - return IPPROTO_NONE; - } - - for (i = 0; ip6exthdr[i].ol_bit != 0; i++) - if (ip6exthdr[i].ol_val == IPPROTO_ROUTING) { - fin->fin_optmsk |= ip6exthdr[i].ol_bit; - break; - } - - fin->fin_dp = (char *)fin->fin_dp + shift; - fin->fin_dlen -= shift; - - return hdr->ip6e_nxt; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_fragment6 */ -/* Returns: int - value of the next header or IPPROTO_NONE if error */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* Examine the IPv6 fragment header and extract fragment offset information.*/ -/* ------------------------------------------------------------------------ */ -static INLINE int frpr_fragment6(fin) -fr_info_t *fin; -{ - struct ip6_frag *frag; - struct ip6_ext *hdr; - int i; - - fin->fin_flx |= (FI_FRAG|FI_V6EXTHDR); - - /* 8 is default length of extension hdr */ - if ((fin->fin_dlen - 8) < 0) { - fin->fin_flx |= FI_SHORT; - return IPPROTO_NONE; - } - - /* - * Only one frgament header is allowed per IPv6 packet but it need - * not be the first nor last (not possible in some cases.) - */ - for (i = 0; ip6exthdr[i].ol_bit != 0; i++) - if (ip6exthdr[i].ol_val == IPPROTO_FRAGMENT) - break; - - if (fin->fin_optmsk & ip6exthdr[i].ol_bit) { - fin->fin_flx |= FI_BAD; - return IPPROTO_NONE; - } - - fin->fin_optmsk |= ip6exthdr[i].ol_bit; - - if (frpr_pullup(fin, sizeof(*frag)) == -1) - return IPPROTO_NONE; - hdr = fin->fin_dp; - - /* - * Length must be zero, i.e. it has no length. - */ - if (hdr->ip6e_len != 0) { - fin->fin_flx |= FI_BAD; - return IPPROTO_NONE; - } - - if ((int)(fin->fin_dlen - sizeof(*frag)) < 0) { - fin->fin_flx |= FI_SHORT; - return IPPROTO_NONE; - } - - frag = fin->fin_dp; - fin->fin_off = frag->ip6f_offlg & IP6F_OFF_MASK; - fin->fin_off <<= 3; - if (fin->fin_off != 0) - fin->fin_flx |= FI_FRAGBODY; - - fin->fin_dp = (char *)fin->fin_dp + sizeof(*frag); - fin->fin_dlen -= sizeof(*frag); - - return frag->ip6f_nxt; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_dstopts6 */ -/* Returns: int - value of the next header or IPPROTO_NONE if error */ -/* Parameters: fin(I) - pointer to packet information */ -/* nextheader(I) - stores next header value */ -/* */ -/* IPv6 Only */ -/* This is function checks pending destination options extension header */ -/* ------------------------------------------------------------------------ */ -static INLINE int frpr_dstopts6(fin) -fr_info_t *fin; -{ - struct ip6_ext *hdr; - u_short shift; - int i; - - /* 8 is default length of extension hdr */ - if ((fin->fin_dlen - 8) < 0) { - fin->fin_flx |= FI_SHORT; - return IPPROTO_NONE; - } - - if (frpr_pullup(fin, 8) == -1) - return IPPROTO_NONE; - hdr = fin->fin_dp; - - shift = 8 + (hdr->ip6e_len << 3); - if (shift > fin->fin_dlen) { /* Nasty extension header length? */ - fin->fin_flx |= FI_BAD; - return IPPROTO_NONE; - } - - for (i = 0; ip6exthdr[i].ol_bit != 0; i++) - if (ip6exthdr[i].ol_val == IPPROTO_DSTOPTS) - break; - fin->fin_optmsk |= ip6exthdr[i].ol_bit; - fin->fin_dp = (char *)fin->fin_dp + shift; - fin->fin_dlen -= shift; - - return hdr->ip6e_nxt; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_icmp6 */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* This routine is mainly concerned with determining the minimum valid size */ -/* for an ICMPv6 packet. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_icmp6(fin) -fr_info_t *fin; -{ - int minicmpsz = sizeof(struct icmp6_hdr); - struct icmp6_hdr *icmp6; - - if (frpr_pullup(fin, ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t)) == -1) - return; - - if (fin->fin_dlen > 1) { - icmp6 = fin->fin_dp; - - fin->fin_data[0] = *(u_short *)icmp6; - - switch (icmp6->icmp6_type) - { - case ICMP6_ECHO_REPLY : - case ICMP6_ECHO_REQUEST : - minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t); - break; - case ICMP6_DST_UNREACH : - case ICMP6_PACKET_TOO_BIG : - case ICMP6_TIME_EXCEEDED : - case ICMP6_PARAM_PROB : - if ((fin->fin_m != NULL) && - (M_LEN(fin->fin_m) < fin->fin_plen)) { - if (fr_coalesce(fin) != 1) - return; - } - fin->fin_flx |= FI_ICMPERR; - minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t); - break; - default : - break; - } - } - - frpr_short(fin, minicmpsz); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_udp6 */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* Analyse the packet for IPv6/UDP properties. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_udp6(fin) -fr_info_t *fin; -{ - - fr_checkv6sum(fin); - - frpr_short(fin, sizeof(struct udphdr)); - - frpr_udpcommon(fin); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_tcp6 */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv6 Only */ -/* Analyse the packet for IPv6/TCP properties. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_tcp6(fin) -fr_info_t *fin; -{ - - fr_checkv6sum(fin); - - frpr_short(fin, sizeof(struct tcphdr)); - - frpr_tcpcommon(fin); -} -#endif /* USE_INET6 */ - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_pullup */ -/* Returns: int - 0 == pullup succeeded, -1 == failure */ -/* Parameters: fin(I) - pointer to packet information */ -/* plen(I) - length (excluding L3 header) to pullup */ -/* */ -/* Short inline function to cut down on code duplication to perform a call */ -/* to fr_pullup to ensure there is the required amount of data, */ -/* consecutively in the packet buffer. */ -/* ------------------------------------------------------------------------ */ -static INLINE int frpr_pullup(fin, plen) -fr_info_t *fin; -int plen; -{ -#if defined(_KERNEL) - if (fin->fin_m != NULL) { - if (fin->fin_dp != NULL) - plen += (char *)fin->fin_dp - - ((char *)fin->fin_ip + fin->fin_hlen); - plen += fin->fin_hlen; - if (M_LEN(fin->fin_m) < plen) { - if (fr_pullup(fin->fin_m, fin, plen) == NULL) - return -1; - } - } -#endif - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_short */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* min(I) - minimum header size */ -/* */ -/* Check if a packet is "short" as defined by min. The rule we are */ -/* applying here is that the packet must not be fragmented within the layer */ -/* 4 header. That is, it must not be a fragment that has its offset set to */ -/* start within the layer 4 header (hdrmin) or if it is at offset 0, the */ -/* entire layer 4 header must be present (min). */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_short(fin, min) -fr_info_t *fin; -int min; -{ - fr_ip_t *fi = &fin->fin_fi; - int off; - - off = fin->fin_off; - if (off == 0) { - if (fin->fin_plen < fin->fin_hlen + min) - fi->fi_flx |= FI_SHORT; - } else if (off < min) { - fi->fi_flx |= FI_SHORT; - } -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_icmp */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv4 Only */ -/* Do a sanity check on the packet for ICMP (v4). In nearly all cases, */ -/* except extrememly bad packets, both type and code will be present. */ -/* The expected minimum size of an ICMP packet is very much dependant on */ -/* the type of it. */ -/* */ -/* XXX - other ICMP sanity checks? */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_icmp(fin) -fr_info_t *fin; -{ - int minicmpsz = sizeof(struct icmp); - icmphdr_t *icmp; - - if (frpr_pullup(fin, ICMPERR_ICMPHLEN) == -1) - return; - - fr_checkv4sum(fin); - - if (!fin->fin_off && (fin->fin_dlen > 1)) { - icmp = fin->fin_dp; - - fin->fin_data[0] = *(u_short *)icmp; - - switch (icmp->icmp_type) - { - case ICMP_ECHOREPLY : - case ICMP_ECHO : - /* Router discovery messaes - RFC 1256 */ - case ICMP_ROUTERADVERT : - case ICMP_ROUTERSOLICIT : - minicmpsz = ICMP_MINLEN; - break; - /* - * type(1) + code(1) + cksum(2) + id(2) seq(2) + - * 3 * timestamp(3 * 4) - */ - case ICMP_TSTAMP : - case ICMP_TSTAMPREPLY : - minicmpsz = 20; - break; - /* - * type(1) + code(1) + cksum(2) + id(2) seq(2) + - * mask(4) - */ - case ICMP_MASKREQ : - case ICMP_MASKREPLY : - minicmpsz = 12; - break; - /* - * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+) - */ - case ICMP_UNREACH : - case ICMP_SOURCEQUENCH : - case ICMP_REDIRECT : - case ICMP_TIMXCEED : - case ICMP_PARAMPROB : - if (fr_coalesce(fin) != 1) - return; - fin->fin_flx |= FI_ICMPERR; - break; - default : - break; - } - - if (fin->fin_dlen >= 6) /* ID field */ - fin->fin_data[1] = icmp->icmp_id; - } - - frpr_short(fin, minicmpsz); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_tcpcommon */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* TCP header sanity checking. Look for bad combinations of TCP flags, */ -/* and make some checks with how they interact with other fields. */ -/* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is */ -/* valid and mark the packet as bad if not. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_tcpcommon(fin) -fr_info_t *fin; -{ - int flags, tlen; - tcphdr_t *tcp; - fr_ip_t *fi; - - fi = &fin->fin_fi; - fi->fi_flx |= FI_TCPUDP; - if (fin->fin_off != 0) - return; - - if (frpr_pullup(fin, sizeof(*tcp)) == -1) - return; - tcp = fin->fin_dp; - - if (fin->fin_dlen > 3) { - fin->fin_sport = ntohs(tcp->th_sport); - fin->fin_dport = ntohs(tcp->th_dport); - } - - if ((fi->fi_flx & FI_SHORT) != 0) - return; - - /* - * Use of the TCP data offset *must* result in a value that is at - * least the same size as the TCP header. - */ - tlen = TCP_OFF(tcp) << 2; - if (tlen < sizeof(tcphdr_t)) { - fin->fin_flx |= FI_BAD; - return; - } - - flags = tcp->th_flags; - fin->fin_tcpf = tcp->th_flags; - - /* - * If the urgent flag is set, then the urgent pointer must - * also be set and vice versa. Good TCP packets do not have - * just one of these set. - */ - if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) { - fin->fin_flx |= FI_BAD; - } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) { - /* Ignore this case, it shows up in "real" traffic with */ - /* bogus values in the urgent pointer field. */ - ; - } else if (((flags & (TH_SYN|TH_FIN)) != 0) && - ((flags & (TH_RST|TH_ACK)) == TH_RST)) { - /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */ - fin->fin_flx |= FI_BAD; - } else if (!(flags & TH_ACK)) { - /* - * If the ack bit isn't set, then either the SYN or - * RST bit must be set. If the SYN bit is set, then - * we expect the ACK field to be 0. If the ACK is - * not set and if URG, PSH or FIN are set, consdier - * that to indicate a bad TCP packet. - */ - if ((flags == TH_SYN) && (tcp->th_ack != 0)) { - /* - * Cisco PIX sets the ACK field to a random value. - * In light of this, do not set FI_BAD until a patch - * is available from Cisco to ensure that - * interoperability between existing systems is - * achieved. - */ - /*fin->fin_flx |= FI_BAD*/; - } else if (!(flags & (TH_RST|TH_SYN))) { - fin->fin_flx |= FI_BAD; - } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) { - fin->fin_flx |= FI_BAD; - } - } - - /* - * At this point, it's not exactly clear what is to be gained by - * marking up which TCP options are and are not present. The one we - * are most interested in is the TCP window scale. This is only in - * a SYN packet [RFC1323] so we don't need this here...? - * Now if we were to analyse the header for passive fingerprinting, - * then that might add some weight to adding this... - */ - if (tlen == sizeof(tcphdr_t)) - return; - - if (frpr_pullup(fin, tlen) == -1) - return; - -#if 0 - ip = fin->fin_ip; - s = (u_char *)(tcp + 1); - off = IP_HL(ip) << 2; -# ifdef _KERNEL - if (fin->fin_mp != NULL) { - mb_t *m = *fin->fin_mp; - - if (off + tlen > M_LEN(m)) - return; - } -# endif - for (tlen -= (int)sizeof(*tcp); tlen > 0; ) { - opt = *s; - if (opt == '\0') - break; - else if (opt == TCPOPT_NOP) - ol = 1; - else { - if (tlen < 2) - break; - ol = (int)*(s + 1); - if (ol < 2 || ol > tlen) - break; - } - - for (i = 9, mv = 4; mv >= 0; ) { - op = ipopts + i; - if (opt == (u_char)op->ol_val) { - optmsk |= op->ol_bit; - break; - } - } - tlen -= ol; - s += ol; - } -#endif /* 0 */ -} - - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_udpcommon */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* Extract the UDP source and destination ports, if present. If compiled */ -/* with IPFILTER_CKSUM, check to see if the UDP checksum is valid. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_udpcommon(fin) -fr_info_t *fin; -{ - udphdr_t *udp; - fr_ip_t *fi; - - fi = &fin->fin_fi; - fi->fi_flx |= FI_TCPUDP; - - if (!fin->fin_off && (fin->fin_dlen > 3)) { - if (frpr_pullup(fin, sizeof(*udp)) == -1) { - fi->fi_flx |= FI_SHORT; - return; - } - - udp = fin->fin_dp; - - fin->fin_sport = ntohs(udp->uh_sport); - fin->fin_dport = ntohs(udp->uh_dport); - } -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_tcp */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv4 Only */ -/* Analyse the packet for IPv4/TCP properties. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_tcp(fin) -fr_info_t *fin; -{ - - fr_checkv4sum(fin); - - frpr_short(fin, sizeof(tcphdr_t)); - - frpr_tcpcommon(fin); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_udp */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv4 Only */ -/* Analyse the packet for IPv4/UDP properties. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_udp(fin) -fr_info_t *fin; -{ - - fr_checkv4sum(fin); - - frpr_short(fin, sizeof(udphdr_t)); - - frpr_udpcommon(fin); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_esp */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* Analyse the packet for ESP properties. */ -/* The minimum length is taken to be the SPI (32bits) plus a tail (32bits) */ -/* even though the newer ESP packets must also have a sequence number that */ -/* is 32bits as well, it is not possible(?) to determine the version from a */ -/* simple packet header. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_esp(fin) -fr_info_t *fin; -{ - if (frpr_pullup(fin, 8) == -1) - return; - - if (fin->fin_v == 4) - frpr_short(fin, 8); -#ifdef USE_INET6 - else if (fin->fin_v == 6) - frpr_short6(fin, sizeof(grehdr_t)); -#endif -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_gre */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* Analyse the packet for GRE properties. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_gre(fin) -fr_info_t *fin; -{ - grehdr_t *gre; - - if (frpr_pullup(fin, sizeof(grehdr_t)) == -1) - return; - - if (fin->fin_v == 4) - frpr_short(fin, sizeof(grehdr_t)); -#ifdef USE_INET6 - else if (fin->fin_v == 6) - frpr_short6(fin, sizeof(grehdr_t)); -#endif - gre = fin->fin_dp; - if (GRE_REV(gre->gr_flags) == 1) - fin->fin_data[0] = gre->gr_call; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frpr_ipv4hdr */ -/* Returns: void */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* IPv4 Only */ -/* Analyze the IPv4 header and set fields in the fr_info_t structure. */ -/* Check all options present and flag their presence if any exist. */ -/* ------------------------------------------------------------------------ */ -static INLINE void frpr_ipv4hdr(fin) -fr_info_t *fin; -{ - u_short optmsk = 0, secmsk = 0, auth = 0; - int hlen, ol, mv, p, i; - const struct optlist *op; - u_char *s, opt; - u_short off; - fr_ip_t *fi; - ip_t *ip; - - fi = &fin->fin_fi; - hlen = fin->fin_hlen; - - ip = fin->fin_ip; - p = ip->ip_p; - fi->fi_p = p; - fi->fi_tos = ip->ip_tos; - fin->fin_id = ip->ip_id; - off = ip->ip_off; - - /* Get both TTL and protocol */ - fi->fi_p = ip->ip_p; - fi->fi_ttl = ip->ip_ttl; -#if 0 - (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4)); -#endif - - /* Zero out bits not used in IPv6 address */ - fi->fi_src.i6[1] = 0; - fi->fi_src.i6[2] = 0; - fi->fi_src.i6[3] = 0; - fi->fi_dst.i6[1] = 0; - fi->fi_dst.i6[2] = 0; - fi->fi_dst.i6[3] = 0; - - fi->fi_saddr = ip->ip_src.s_addr; - fi->fi_daddr = ip->ip_dst.s_addr; - - /* - * set packet attribute flags based on the offset and - * calculate the byte offset that it represents. - */ - if ((off & IP_MF) != 0) { - fi->fi_flx |= FI_FRAG; - if (fin->fin_dlen == 0) - fi->fi_flx |= FI_BAD; - } - - off &= IP_MF|IP_OFFMASK; - if (off != 0) { - fi->fi_flx |= FI_FRAG; - off &= IP_OFFMASK; - if (off != 0) { - fin->fin_flx |= FI_FRAGBODY; - off <<= 3; - if (off + fin->fin_dlen > 0xffff) { - fi->fi_flx |= FI_BAD; - } - } - } - fin->fin_off = off; - - /* - * Call per-protocol setup and checking - */ - switch (p) - { - case IPPROTO_UDP : - frpr_udp(fin); - break; - case IPPROTO_TCP : - frpr_tcp(fin); - break; - case IPPROTO_ICMP : - frpr_icmp(fin); - break; - case IPPROTO_ESP : - frpr_esp(fin); - break; - case IPPROTO_GRE : - frpr_gre(fin); - break; - } - - ip = fin->fin_ip; - if (ip == NULL) - return; - - /* - * If it is a standard IP header (no options), set the flag fields - * which relate to options to 0. - */ - if (hlen == sizeof(*ip)) { - fi->fi_optmsk = 0; - fi->fi_secmsk = 0; - fi->fi_auth = 0; - return; - } - - /* - * So the IP header has some IP options attached. Walk the entire - * list of options present with this packet and set flags to indicate - * which ones are here and which ones are not. For the somewhat out - * of date and obscure security classification options, set a flag to - * represent which classification is present. - */ - fi->fi_flx |= FI_OPTIONS; - - for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) { - opt = *s; - if (opt == '\0') - break; - else if (opt == IPOPT_NOP) - ol = 1; - else { - if (hlen < 2) - break; - ol = (int)*(s + 1); - if (ol < 2 || ol > hlen) - break; - } - for (i = 9, mv = 4; mv >= 0; ) { - op = ipopts + i; - if ((opt == (u_char)op->ol_val) && (ol > 4)) { - optmsk |= op->ol_bit; - if (opt == IPOPT_SECURITY) { - const 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; - m--; - } - } - break; - } - if (opt < op->ol_val) - i -= mv; - else - i += mv; - mv--; - } - hlen -= ol; - s += ol; - } - - /* - * - */ - if (auth && !(auth & 0x0100)) - auth &= 0xff00; - fi->fi_optmsk = optmsk; - fi->fi_secmsk = secmsk; - fi->fi_auth = auth; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_makefrip */ -/* Returns: void */ -/* Parameters: hlen(I) - length of IP packet header */ -/* ip(I) - pointer to the IP header */ -/* fin(IO) - pointer to packet information */ -/* */ -/* Compact the IP header into a structure which contains just the info. */ -/* which is useful for comparing IP headers with and store this information */ -/* in the fr_info_t structure pointer to by fin. At present, it is assumed */ -/* this function will be called with either an IPv4 or IPv6 packet. */ -/* ------------------------------------------------------------------------ */ -int fr_makefrip(hlen, ip, fin) -int hlen; -ip_t *ip; -fr_info_t *fin; -{ - int v; - - fin->fin_nat = NULL; - fin->fin_state = NULL; - fin->fin_depth = 0; - fin->fin_hlen = (u_short)hlen; - fin->fin_ip = ip; - fin->fin_rule = 0xffffffff; - fin->fin_group[0] = -1; - fin->fin_group[1] = '\0'; - fin->fin_dlen = fin->fin_plen - hlen; - fin->fin_dp = (char *)ip + hlen; - - v = fin->fin_v; - if (v == 4) - frpr_ipv4hdr(fin); -#ifdef USE_INET6 - else if (v == 6) - frpr_ipv6hdr(fin); -#endif - if (fin->fin_ip == NULL) - return -1; - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_portcheck */ -/* Returns: int - 1 == port matched, 0 == port match failed */ -/* Parameters: frp(I) - pointer to port check `expression' */ -/* pop(I) - pointer to port number to evaluate */ -/* */ -/* Perform a comparison of a port number against some other(s), using a */ -/* structure with compare information stored in it. */ -/* ------------------------------------------------------------------------ */ -static INLINE int fr_portcheck(frp, pop) -frpcmp_t *frp; -u_short *pop; -{ - u_short tup, po; - int err = 1; - - tup = *pop; - po = frp->frp_port; - - /* - * Do opposite test to that required and continue if that succeeds. - */ - switch (frp->frp_cmp) - { - case FR_EQUAL : - if (tup != po) /* EQUAL */ - err = 0; - break; - case FR_NEQUAL : - if (tup == po) /* NOTEQUAL */ - err = 0; - break; - case FR_LESST : - if (tup >= po) /* LESSTHAN */ - err = 0; - break; - case FR_GREATERT : - if (tup <= po) /* GREATERTHAN */ - err = 0; - break; - case FR_LESSTE : - if (tup > po) /* LT or EQ */ - err = 0; - break; - case FR_GREATERTE : - if (tup < po) /* GT or EQ */ - err = 0; - break; - case FR_OUTRANGE : - if (tup >= po && tup <= frp->frp_top) /* Out of range */ - err = 0; - break; - case FR_INRANGE : - if (tup <= po || tup >= frp->frp_top) /* In range */ - err = 0; - break; - case FR_INCRANGE : - if (tup < po || tup > frp->frp_top) /* Inclusive range */ - err = 0; - break; - default : - break; - } - return err; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_tcpudpchk */ -/* Returns: int - 1 == protocol matched, 0 == check failed */ -/* Parameters: fin(I) - pointer to packet information */ -/* ft(I) - pointer to structure with comparison data */ -/* */ -/* Compares the current pcket (assuming it is TCP/UDP) information with a */ -/* structure containing information that we want to match against. */ -/* ------------------------------------------------------------------------ */ -int fr_tcpudpchk(fin, ft) -fr_info_t *fin; -frtuc_t *ft; -{ - 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 (ft->ftu_dcmp) - err = fr_portcheck(&ft->ftu_dst, &fin->fin_dport); - - /* - * compare source ports - */ - if (err && ft->ftu_scmp) - err = fr_portcheck(&ft->ftu_src, &fin->fin_sport); - - /* - * 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_p == IPPROTO_TCP)) { - if (fin->fin_flx & FI_SHORT) - return !(ft->ftu_tcpf | ft->ftu_tcpfm); - /* - * Match the flags ? If not, abort this match. - */ - if (ft->ftu_tcpfm && - ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) { - FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf, - ft->ftu_tcpfm, ft->ftu_tcpf)); - err = 0; - } - } - return err; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_ipfcheck */ -/* Returns: int - 0 == match, 1 == no match */ -/* Parameters: fin(I) - pointer to packet information */ -/* fr(I) - pointer to filter rule */ -/* portcmp(I) - flag indicating whether to attempt matching on */ -/* TCP/UDP port data. */ -/* */ -/* Check to see if a packet matches an IPFilter rule. Checks of addresses, */ -/* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */ -/* this function. */ -/* ------------------------------------------------------------------------ */ -static INLINE int fr_ipfcheck(fin, fr, portcmp) -fr_info_t *fin; -frentry_t *fr; -int portcmp; -{ - u_32_t *ld, *lm, *lip; - fripf_t *fri; - fr_ip_t *fi; - int i; - - fi = &fin->fin_fi; - fri = fr->fr_ipf; - lip = (u_32_t *)fi; - lm = (u_32_t *)&fri->fri_mip; - ld = (u_32_t *)&fri->fri_ip; - - /* - * first 32 bits to check coversion: - * IP version, TOS, TTL, protocol - */ - i = ((*lip & *lm) != *ld); - FR_DEBUG(("0. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - if (i) - return 1; - - /* - * Next 32 bits is a constructed bitmask indicating which IP options - * are present (if any) in this packet. - */ - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("1. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - if (i) - return 1; - - lip++, lm++, ld++; - /* - * Unrolled loops (4 each, for 32 bits) for address checks. - */ - /* - * Check the source address. - */ -#ifdef IPFILTER_LOOKUP - if (fr->fr_satype == FRI_LOOKUP) { - i = (*fr->fr_srcfunc)(fr->fr_srcptr, fi->fi_v, lip); - if (i == -1) - return 1; - lip += 3; - lm += 3; - ld += 3; - } else { -#endif - i = ((*lip & *lm) != *ld); - FR_DEBUG(("2a. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - if (fi->fi_v == 6) { - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("2b. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("2c. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("2d. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - } else { - lip += 3; - lm += 3; - ld += 3; - } -#ifdef IPFILTER_LOOKUP - } -#endif - i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6; - if (i) - return 1; - - /* - * Check the destination address. - */ - lip++, lm++, ld++; -#ifdef IPFILTER_LOOKUP - if (fr->fr_datype == FRI_LOOKUP) { - i = (*fr->fr_dstfunc)(fr->fr_dstptr, fi->fi_v, lip); - if (i == -1) - return 1; - lip += 3; - lm += 3; - ld += 3; - } else { -#endif - i = ((*lip & *lm) != *ld); - FR_DEBUG(("3a. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - if (fi->fi_v == 6) { - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("3b. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("3c. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("3d. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - } else { - lip += 3; - lm += 3; - ld += 3; - } -#ifdef IPFILTER_LOOKUP - } -#endif - i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7; - if (i) - return 1; - /* - * IP addresses matched. The next 32bits contains: - * mast of old IP header security & authentication bits. - */ - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("4. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - - /* - * Next we have 32 bits of packet flags. - */ - lip++, lm++, ld++; - i |= ((*lip & *lm) != *ld); - FR_DEBUG(("5. %#08x & %#08x != %#08x\n", - *lip, *lm, *ld)); - - if (i == 0) { - /* - * If a fragment, then only the first has what we're - * looking for here... - */ - if (portcmp) { - if (!fr_tcpudpchk(fin, &fr->fr_tuc)) - i = 1; - } else { - if (fr->fr_dcmp || fr->fr_scmp || - fr->fr_tcpf || fr->fr_tcpfm) - i = 1; - if (fr->fr_icmpm || fr->fr_icmp) { - if (((fi->fi_p != IPPROTO_ICMP) && - (fi->fi_p != IPPROTO_ICMPV6)) || - fin->fin_off || (fin->fin_dlen < 2)) - i = 1; - else 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)); - i = 1; - } - } - } - } - return i; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_scanlist */ -/* Returns: int - result flags of scanning filter list */ -/* Parameters: fin(I) - pointer to packet information */ -/* pass(I) - default result to return for filtering */ -/* */ -/* Check the input/output list of rules for a match to the current packet. */ -/* If a match is found, the value of fr_flags from the rule becomes the */ -/* return value and fin->fin_fr points to the matched rule. */ -/* */ -/* This function may be called recusively upto 16 times (limit inbuilt.) */ -/* When unwinding, it should finish up with fin_depth as 0. */ -/* */ -/* Could be per interface, but this gets real nasty when you don't have, */ -/* or can't easily change, the kernel source code to . */ -/* ------------------------------------------------------------------------ */ -int fr_scanlist(fin, pass) -fr_info_t *fin; -u_32_t pass; -{ - int rulen, portcmp, off, logged, skip; - struct frentry *fr, *fnext; - u_32_t passt; - - /* - * Do not allow nesting deeper than 16 levels. - */ - if (fin->fin_depth >= 16) - return pass; - - fr = fin->fin_fr; - - /* - * If there are no rules in this list, return now. - */ - if (fr == NULL) - return pass; - - skip = 0; - logged = 0; - portcmp = 0; - fin->fin_depth++; - fin->fin_fr = NULL; - off = fin->fin_off; - - if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off) - portcmp = 1; - - for (rulen = 0; fr; fr = fnext, rulen++) { - fnext = fr->fr_next; - if (skip != 0) { - FR_VERBOSE(("%d (%#x)\n", skip, fr->fr_flags)); - 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 (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) - continue; -#else - if (opts & (OPT_VERBOSE|OPT_DEBUG)) - printf("\n"); - FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' : - FR_ISPASS(pass) ? 'p' : - FR_ISACCOUNT(pass) ? 'A' : - FR_ISAUTH(pass) ? 'a' : - (pass & FR_NOMATCH) ? 'n' :'b')); - if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp) - continue; - FR_VERBOSE((":i")); -#endif - - switch (fr->fr_type) - { - case FR_T_IPF : - case FR_T_IPF|FR_T_BUILTIN : - if (fr_ipfcheck(fin, fr, portcmp)) - continue; - break; -#if defined(IPFILTER_BPF) - case FR_T_BPFOPC : - case FR_T_BPFOPC|FR_T_BUILTIN : - { - u_char *mc; - int wlen; - - if (*fin->fin_mp == NULL) - continue; - if (fin->fin_v != fr->fr_v) - continue; - mc = (u_char *)fin->fin_m; - wlen = fin->fin_dlen + fin->fin_hlen; - if (!bpf_filter(fr->fr_data, mc, wlen, 0)) - continue; - break; - } -#endif - case FR_T_CALLFUNC|FR_T_BUILTIN : - { - frentry_t *f; - - f = (*fr->fr_func)(fin, &pass); - if (f != NULL) - fr = f; - else - continue; - break; - } - default : - break; - } - - if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) { - if (fin->fin_nattag == NULL) - continue; - if (fr_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0) - continue; - } - FR_VERBOSE(("=%s.%d *", fr->fr_group, rulen)); - - passt = fr->fr_flags; - - /* - * Allowing a rule with the "keep state" flag set to match - * packets that have been tagged "out of window" by the TCP - * state tracking is foolish as the attempt to add a new - * state entry to the table will fail. - */ - if ((passt & FR_KEEPSTATE) && (fin->fin_flx & FI_OOW)) - continue; - - /* - * If the rule is a "call now" rule, then call the function - * in the rule, if it exists and use the results from that. - * If the function pointer is bad, just make like we ignore - * it, except for increasing the hit counter. - */ - if ((passt & FR_CALLNOW) != 0) { - ATOMIC_INC64(fr->fr_hits); - if ((fr->fr_func != NULL) && - (fr->fr_func != (ipfunc_t)-1)) { - frentry_t *frs; - - frs = fin->fin_fr; - fin->fin_fr = fr; - fr = (*fr->fr_func)(fin, &passt); - if (fr == NULL) { - fin->fin_fr = frs; - continue; - } - passt = fr->fr_flags; - fin->fin_fr = fr; - } - } else { - fin->fin_fr = fr; - } - -#ifdef IPFILTER_LOG - /* - * Just log this packet... - */ - if ((passt & FR_LOGMASK) == FR_LOG) { - if (ipflog(fin, passt) == -1) { - if (passt & FR_LOGORBLOCK) { - passt &= ~FR_CMDMASK; - passt |= FR_BLOCK|FR_QUICK; - } - ATOMIC_INCL(frstats[fin->fin_out].fr_skip); - } - ATOMIC_INCL(frstats[fin->fin_out].fr_pkl); - logged = 1; - } -#endif /* IPFILTER_LOG */ - fr->fr_bytes += (U_QUAD_T)fin->fin_plen; - if (FR_ISSKIP(passt)) - skip = fr->fr_arg; - else if ((passt & FR_LOGMASK) != FR_LOG) - pass = passt; - if (passt & (FR_RETICMP|FR_FAKEICMP)) - fin->fin_icode = fr->fr_icode; - FR_DEBUG(("pass %#x\n", pass)); - ATOMIC_INC64(fr->fr_hits); - fin->fin_rule = rulen; - (void) strncpy(fin->fin_group, fr->fr_group, FR_GROUPLEN); - if (fr->fr_grp != NULL) { - fin->fin_fr = *fr->fr_grp; - pass = fr_scanlist(fin, pass); - if (fin->fin_fr == NULL) { - fin->fin_rule = rulen; - (void) strncpy(fin->fin_group, fr->fr_group, - FR_GROUPLEN); - fin->fin_fr = fr; - } - if (fin->fin_flx & FI_DONTCACHE) - logged = 1; - } - if (pass & FR_QUICK) - break; - } - if (logged) - fin->fin_flx |= FI_DONTCACHE; - fin->fin_depth--; - return pass; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_acctpkt */ -/* Returns: frentry_t* - always returns NULL */ -/* Parameters: fin(I) - pointer to packet information */ -/* passp(IO) - pointer to current/new filter decision (unused) */ -/* */ -/* Checks a packet against accounting rules, if there are any for the given */ -/* IP protocol version. */ -/* */ -/* N.B.: this function returns NULL to match the prototype used by other */ -/* functions called from the IPFilter "mainline" in fr_check(). */ -/* ------------------------------------------------------------------------ */ -frentry_t *fr_acctpkt(fin, passp) -fr_info_t *fin; -u_32_t *passp; -{ - char group[FR_GROUPLEN]; - frentry_t *fr, *frsave; - u_32_t pass, rulen; - - passp = passp; -#ifdef USE_INET6 - if (fin->fin_v == 6) - fr = ipacct6[fin->fin_out][fr_active]; - else -#endif - fr = ipacct[fin->fin_out][fr_active]; - - if (fr != NULL) { - frsave = fin->fin_fr; - bcopy(fin->fin_group, group, FR_GROUPLEN); - rulen = fin->fin_rule; - fin->fin_fr = fr; - pass = fr_scanlist(fin, FR_NOMATCH); - if (FR_ISACCOUNT(pass)) { - ATOMIC_INCL(frstats[0].fr_acct); - } - fin->fin_fr = frsave; - bcopy(group, fin->fin_group, FR_GROUPLEN); - fin->fin_rule = rulen; - } - return NULL; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_firewall */ -/* Returns: frentry_t* - returns pointer to matched rule, if no matches */ -/* were found, returns NULL. */ -/* Parameters: fin(I) - pointer to packet information */ -/* passp(IO) - pointer to current/new filter decision (unused) */ -/* */ -/* Applies an appropriate set of firewall rules to the packet, to see if */ -/* there are any matches. The first check is to see if a match can be seen */ -/* in the cache. If not, then search an appropriate list of rules. Once a */ -/* matching rule is found, take any appropriate actions as defined by the */ -/* rule - except logging. */ -/* ------------------------------------------------------------------------ */ -static frentry_t *fr_firewall(fin, passp) -fr_info_t *fin; -u_32_t *passp; -{ - frentry_t *fr; - fr_info_t *fc; - u_32_t pass; - int out; - - out = fin->fin_out; - pass = *passp; - - /* - * 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. - */ - fc = &frcache[out][CACHE_HASH(fin)]; - 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_INCL(frstats[out].fr_chit); - if ((fr = fin->fin_fr) != NULL) { - ATOMIC_INC64(fr->fr_hits); - pass = fr->fr_flags; - } - } else { -#ifdef USE_INET6 - if (fin->fin_v == 6) - fin->fin_fr = ipfilter6[out][fr_active]; - else -#endif - fin->fin_fr = ipfilter[out][fr_active]; - if (fin->fin_fr != NULL) - pass = fr_scanlist(fin, fr_pass); - if (((pass & FR_KEEPSTATE) == 0) && - ((fin->fin_flx & FI_DONTCACHE) == 0)) - bcopy((char *)fin, (char *)fc, FI_COPYSIZE); - if ((pass & FR_NOMATCH)) { - ATOMIC_INCL(frstats[out].fr_nom); - } - fr = fin->fin_fr; - } - - /* - * Apply packets per second rate-limiting to a rule as required. - */ - if ((fr != NULL) && (fr->fr_pps != 0) && - !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) { - pass &= ~(FR_CMDMASK|FR_DUP|FR_RETICMP|FR_RETRST); - pass |= FR_BLOCK; - ATOMIC_INCL(frstats[out].fr_ppshit); - } - - /* - * 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 (FR_ISAUTH(pass)) { - if (fr_newauth(fin->fin_m, fin) != 0) { -#ifdef _KERNEL - fin->fin_m = *fin->fin_mp = NULL; -#else - ; -#endif - fin->fin_error = 0; - } else - fin->fin_error = ENOSPC; - } - - if ((fr != NULL) && (fr->fr_func != NULL) && - (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW)) - (void) (*fr->fr_func)(fin, &pass); - - /* - * If a rule is a pre-auth rule, check again in the list of rules - * loaded for authenticated use. It does not particulary matter - * if this search fails because a "preauth" result, from a rule, - * is treated as "not a pass", hence the packet is blocked. - */ - if (FR_ISPREAUTH(pass)) { - if ((fin->fin_fr = ipauth) != NULL) - pass = fr_scanlist(fin, fr_pass); - } - - /* - * If the rule has "keep frag" and the packet is actually a fragment, - * then create a fragment state entry. - */ - if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) { - if (fin->fin_flx & FI_FRAG) { - if (fr_newfrag(fin, pass) == -1) { - ATOMIC_INCL(frstats[out].fr_bnfr); - } else { - ATOMIC_INCL(frstats[out].fr_nfr); - } - } else { - ATOMIC_INCL(frstats[out].fr_cfr); - } - } - - /* - * Finally, if we've asked to track state for this packet, set it up. - */ - if ((pass & FR_KEEPSTATE) && !(fin->fin_flx & FI_STATE)) { - if (fr_addstate(fin, NULL, 0) != NULL) { - ATOMIC_INCL(frstats[out].fr_ads); - } else { - ATOMIC_INCL(frstats[out].fr_bads); - if (FR_ISPASS(pass)) { - pass &= ~FR_CMDMASK; - pass |= FR_BLOCK; - } - } - } - - fr = fin->fin_fr; - - if (passp != NULL) - *passp = pass; - - return fr; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_check */ -/* Returns: int - 0 == packet allowed through, */ -/* User space: */ -/* -1 == packet blocked */ -/* 1 == packet not matched */ -/* -2 == requires authantication */ -/* Kernel: */ -/* > 0 == filter error # for packet */ -/* Parameters: ip(I) - pointer to start of IPv4/6 packet */ -/* hlen(I) - length of header */ -/* ifp(I) - pointer to interface this packet is on */ -/* out(I) - 0 == packet going in, 1 == packet going out */ -/* mp(IO) - pointer to caller's buffer pointer that holds this */ -/* IP packet. */ -/* Solaris & HP-UX ONLY : */ -/* qpi(I) - pointer to STREAMS queue information for this */ -/* interface & direction. */ -/* */ -/* fr_check() is the master function for all IPFilter packet processing. */ -/* It orchestrates: Network Address Translation (NAT), checking for packet */ -/* authorisation (or pre-authorisation), presence of related state info., */ -/* generating log entries, IP packet accounting, routing of packets as */ -/* directed by firewall rules and of course whether or not to allow the */ -/* packet to be further processed by the kernel. */ -/* */ -/* For packets blocked, the contents of "mp" will be NULL'd and the buffer */ -/* freed. Packets passed may be returned with the pointer pointed to by */ -/* by "mp" changed to a new buffer. */ -/* ------------------------------------------------------------------------ */ -int fr_check(ip, hlen, ifp, out -#if defined(_KERNEL) && defined(MENTAT) -, qif, mp) -void *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; - fr_info_t *fin = &frinfo; - u_32_t pass = fr_pass; - frentry_t *fr = NULL; - int v = IP_V(ip); - mb_t *mc = NULL; - mb_t *m; -#ifdef USE_INET6 - ip6_t *ip6; -#endif - - /* - * The first part of fr_check() deals with making sure that what goes - * into the filtering engine makes some sense. Information about the - * the packet is distilled, collected into a fr_info_t structure and - * the an attempt to ensure the buffer the packet is in is big enough - * to hold all the required packet headers. - */ -#ifdef _KERNEL -# ifdef MENTAT - qpktinfo_t *qpi = qif; - - if ((u_int)ip & 0x3) - return 2; -# endif - - READ_ENTER(&ipf_global); - - if (fr_running <= 0) { - RWLOCK_EXIT(&ipf_global); - return 0; - } - - bzero((char *)fin, sizeof(*fin)); - -# ifdef MENTAT - if (qpi->qpi_flags & QF_GROUP) - fin->fin_flx |= FI_MBCAST; - m = qpi->qpi_m; - fin->fin_qfm = m; - fin->fin_qpi = qpi; -# else /* MENTAT */ - - m = *mp; - -# if defined(M_MCAST) - if ((m->m_flags & M_MCAST) != 0) - fin->fin_flx |= FI_MBCAST|FI_MULTICAST; -# endif -# if defined(M_BCAST) - if ((m->m_flags & M_BCAST) != 0) - fin->fin_flx |= FI_MBCAST|FI_BROADCAST; -# endif -# 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 */ -# ifdef CSUM_DELAY_DATA - /* - * disable delayed checksums. - */ - if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { - in_delayed_cksum(m); - m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; - } -# endif /* CSUM_DELAY_DATA */ -# endif /* MENTAT */ -#else - READ_ENTER(&ipf_global); - - bzero((char *)fin, sizeof(*fin)); - m = *mp; -#endif /* _KERNEL */ - - fin->fin_v = v; - fin->fin_m = m; - fin->fin_ip = ip; - fin->fin_mp = mp; - fin->fin_out = out; - fin->fin_ifp = ifp; - fin->fin_error = ENETUNREACH; - fin->fin_hlen = (u_short )hlen; - fin->fin_dp = (char *)ip + hlen; - - fin->fin_ipoff = (char *)ip - MTOD(m, char *); - -#ifdef USE_INET6 - if (v == 6) { - ATOMIC_INCL(frstats[out].fr_ipv6); - /* - * Jumbo grams are quite likely too big for internal buffer - * structures to handle comfortably, for now, so just drop - * them. - */ - ip6 = (ip6_t *)ip; - fin->fin_plen = ntohs(ip6->ip6_plen); - if (fin->fin_plen == 0) { - pass = FR_BLOCK|FR_NOMATCH; - goto filtered; - } - fin->fin_plen += sizeof(ip6_t); - } else -#endif - { -#if (OpenBSD >= 200311) && defined(_KERNEL) - ip->ip_len = ntohs(ip->ip_len); - ip->ip_off = ntohs(ip->ip_off); -#endif - fin->fin_plen = ip->ip_len; - } - - if (fr_makefrip(hlen, ip, fin) == -1) - goto finished; - - /* - * For at least IPv6 packets, if a m_pullup() fails then this pointer - * becomes NULL and so we have no packet to free. - */ - if (*fin->fin_mp == NULL) - goto finished; - - if (!out) { - if (v == 4) { -#ifdef _KERNEL - if (fr_chksrc && !fr_verifysrc(fin)) { - ATOMIC_INCL(frstats[0].fr_badsrc); - fin->fin_flx |= FI_BADSRC; - } -#endif - if (fin->fin_ip->ip_ttl < fr_minttl) { - ATOMIC_INCL(frstats[0].fr_badttl); - fin->fin_flx |= FI_LOWTTL; - } - } -#ifdef USE_INET6 - else if (v == 6) { - ip6 = (ip6_t *)ip; - if (ip6->ip6_hlim < fr_minttl) { - ATOMIC_INCL(frstats[0].fr_badttl); - fin->fin_flx |= FI_LOWTTL; - } - } -#endif - } - - if (fin->fin_flx & FI_SHORT) { - ATOMIC_INCL(frstats[out].fr_short); - } - - 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. - */ - fr = fr_checkauth(fin, &pass); - if (!out) { - if (fr_checknatin(fin, &pass) == -1) { - RWLOCK_EXIT(&ipf_mutex); - goto finished; - } - } - if (!out) - (void) fr_acctpkt(fin, NULL); - - if (fr == NULL) - if ((fin->fin_flx & (FI_FRAG|FI_BAD)) == FI_FRAG) - fr = fr_knownfrag(fin, &pass); - if (fr == NULL) - fr = fr_checkstate(fin, &pass); - - if ((pass & FR_NOMATCH) || (fr == NULL)) - fr = fr_firewall(fin, &pass); - - fin->fin_fr = fr; - - /* - * Only count/translate packets which will be passed on, out the - * interface. - */ - if (out && FR_ISPASS(pass)) { - (void) fr_acctpkt(fin, NULL); - - if (fr_checknatout(fin, &pass) == -1) { - RWLOCK_EXIT(&ipf_mutex); - goto finished; - } else if ((fr_update_ipid != 0) && (v == 4)) { - if (fr_updateipid(fin) == -1) { - ATOMIC_INCL(frstats[1].fr_ipud); - pass &= ~FR_CMDMASK; - pass |= FR_BLOCK; - } else { - ATOMIC_INCL(frstats[0].fr_ipud); - } - } - } - -#ifdef IPFILTER_LOG - if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) { - (void) fr_dolog(fin, &pass); - } -#endif - - if (fin->fin_state != NULL) - fr_statederef(fin, (ipstate_t **)&fin->fin_state); - - if (fin->fin_nat != NULL) - fr_natderef((nat_t **)&fin->fin_nat); - - /* - * 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. Use fin_m here because it may have changed - * (without an update of 'm') in prior processing. - */ - if ((fr != NULL) && (pass & FR_DUP)) { - mc = M_DUPLICATE(fin->fin_m); - } - - if (pass & (FR_RETRST|FR_RETICMP)) { - /* - * 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) { - if (pass & FR_RETICMP) { - int dst; - - if ((pass & FR_RETMASK) == FR_FAKEICMP) - dst = 1; - else - dst = 0; - (void) fr_send_icmp_err(ICMP_UNREACH, fin, dst); - ATOMIC_INCL(frstats[0].fr_ret); - } else if (((pass & FR_RETMASK) == FR_RETRST) && - !(fin->fin_flx & FI_SHORT)) { - if (fr_send_reset(fin) == 0) { - ATOMIC_INCL(frstats[1].fr_ret); - } - } - } else { - if (pass & FR_RETRST) - fin->fin_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 *). - * Reassign m from fin_m as we may have a new buffer, now. - */ -#if defined(USE_INET6) || (defined(__sgi) && defined(_KERNEL)) -filtered: -#endif - m = fin->fin_m; - - if (fr != NULL) { - frdest_t *fdp; - - fdp = &fr->fr_tifs[fin->fin_rev]; - - if (!out && (pass & FR_FASTROUTE)) { - /* - * For fastroute rule, no destioation interface defined - * so pass NULL as the frdest_t parameter - */ - (void) fr_fastroute(m, mp, fin, NULL); - m = *mp = NULL; - } else if ((fdp->fd_ifp != NULL) && - (fdp->fd_ifp != (struct ifnet *)-1)) { - /* this is for to rules: */ - (void) fr_fastroute(m, mp, fin, fdp); - m = *mp = NULL; - } - - /* - * Generate a duplicated packet. - */ - if (mc != NULL) - (void) fr_fastroute(mc, &mc, fin, &fr->fr_dif); - } - - /* - * This late because the likes of fr_fastroute() use fin_fr. - */ - RWLOCK_EXIT(&ipf_mutex); - -finished: - if (!FR_ISPASS(pass)) { - ATOMIC_INCL(frstats[out].fr_block); - if (*mp != NULL) { - FREE_MB_T(*mp); - m = *mp = NULL; - } - } else { - ATOMIC_INCL(frstats[out].fr_pass); -#if defined(_KERNEL) && defined(__sgi) - if ((fin->fin_hbuf != NULL) && - (mtod(fin->fin_m, struct ip *) != fin->fin_ip)) { - COPYBACK(m, 0, fin->fin_plen, fin->fin_hbuf); - } -#endif - } - - RWLOCK_EXIT(&ipf_global); -#ifdef _KERNEL -# if OpenBSD >= 200311 - if (FR_ISPASS(pass) && (v == 4)) { - ip = fin->fin_ip; - ip->ip_len = ntohs(ip->ip_len); - ip->ip_off = ntohs(ip->ip_off); - } -# endif - return (FR_ISPASS(pass)) ? 0 : fin->fin_error; -#else /* _KERNEL */ - FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass)); - if ((pass & FR_NOMATCH) != 0) - return 1; - - if ((pass & FR_RETMASK) != 0) - switch (pass & FR_RETMASK) - { - case FR_RETRST : - return 3; - case FR_RETICMP : - return 4; - case FR_FAKEICMP : - return 5; - } - - switch (pass & FR_CMDMASK) - { - case FR_PASS : - return 0; - case FR_BLOCK : - return -1; - case FR_AUTH : - return -2; - case FR_ACCOUNT : - return -3; - case FR_PREAUTH : - return -4; - } - return 2; -#endif /* _KERNEL */ -} - - -#ifdef IPFILTER_LOG -/* ------------------------------------------------------------------------ */ -/* Function: fr_dolog */ -/* Returns: frentry_t* - returns contents of fin_fr (no change made) */ -/* Parameters: fin(I) - pointer to packet information */ -/* passp(IO) - pointer to current/new filter decision (unused) */ -/* */ -/* Checks flags set to see how a packet should be logged, if it is to be */ -/* logged. Adjust statistics based on its success or not. */ -/* ------------------------------------------------------------------------ */ -frentry_t *fr_dolog(fin, passp) -fr_info_t *fin; -u_32_t *passp; -{ - u_32_t pass; - int out; - - out = fin->fin_out; - pass = *passp; - - if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) { - pass |= FF_LOGNOMATCH; - ATOMIC_INCL(frstats[out].fr_npkl); - goto logit; - } else if (((pass & FR_LOGMASK) == FR_LOGP) || - (FR_ISPASS(pass) && (fr_flags & FF_LOGPASS))) { - if ((pass & FR_LOGMASK) != FR_LOGP) - pass |= FF_LOGPASS; - ATOMIC_INCL(frstats[out].fr_ppkl); - goto logit; - } else if (((pass & FR_LOGMASK) == FR_LOGB) || - (FR_ISBLOCK(pass) && (fr_flags & FF_LOGBLOCK))) { - if ((pass & FR_LOGMASK) != FR_LOGB) - pass |= FF_LOGBLOCK; - ATOMIC_INCL(frstats[out].fr_bpkl); -logit: - if (ipflog(fin, pass) == -1) { - ATOMIC_INCL(frstats[out].fr_skip); - - /* - * If the "or-block" option has been used then - * block the packet if we failed to log it. - */ - if ((pass & FR_LOGORBLOCK) && - FR_ISPASS(pass)) { - pass &= ~FR_CMDMASK; - pass |= FR_BLOCK; - } - } - *passp = pass; - } - - return fin->fin_fr; -} -#endif /* IPFILTER_LOG */ - - -/* ------------------------------------------------------------------------ */ -/* Function: ipf_cksum */ -/* Returns: u_short - IP header checksum */ -/* Parameters: addr(I) - pointer to start of buffer to checksum */ -/* len(I) - length of buffer in bytes */ -/* */ -/* Calculate the two's complement 16 bit checksum of the buffer passed. */ -/* */ -/* N.B.: addr should be 16bit aligned. */ -/* ------------------------------------------------------------------------ */ -u_short ipf_cksum(addr, len) -u_short *addr; -int len; -{ - 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); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_cksum */ -/* Returns: u_short - layer 4 checksum */ -/* Parameters: m(I ) - pointer to buffer holding packet */ -/* ip(I) - pointer to IP header */ -/* l4proto(I) - protocol to caclulate checksum for */ -/* l4hdr(I) - pointer to layer 4 header */ -/* */ -/* Calculates the TCP checksum for the packet held in "m", using the data */ -/* in the IP header "ip" to seed it. */ -/* */ -/* 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. */ -/* */ -/* Expects ip_len to be in host byte order when called. */ -/* ------------------------------------------------------------------------ */ -u_short fr_cksum(m, ip, l4proto, l4hdr) -mb_t *m; -ip_t *ip; -int l4proto; -void *l4hdr; -{ - u_short *sp, slen, sumsave, l4hlen, *csump; - u_int sum, sum2; - int hlen; -#ifdef USE_INET6 - ip6_t *ip6; -#endif - - csump = NULL; - sumsave = 0; - l4hlen = 0; - sp = NULL; - slen = 0; - hlen = 0; - sum = 0; - - /* - * Add up IP Header portion - */ -#ifdef USE_INET6 - if (IP_V(ip) == 4) { -#endif - hlen = IP_HL(ip) << 2; - slen = ip->ip_len - hlen; - sum = htons((u_short)l4proto); - sum += htons(slen); - sp = (u_short *)&ip->ip_src; - sum += *sp++; /* ip_src */ - sum += *sp++; - sum += *sp++; /* ip_dst */ - sum += *sp++; -#ifdef USE_INET6 - } else if (IP_V(ip) == 6) { - ip6 = (ip6_t *)ip; - hlen = sizeof(*ip6); - slen = ntohs(ip6->ip6_plen); - sum = htons((u_short)l4proto); - sum += htons(slen); - sp = (u_short *)&ip6->ip6_src; - sum += *sp++; /* ip6_src */ - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; /* ip6_dst */ - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - sum += *sp++; - } -#endif - - switch (l4proto) - { - case IPPROTO_UDP : - csump = &((udphdr_t *)l4hdr)->uh_sum; - l4hlen = sizeof(udphdr_t); - break; - - case IPPROTO_TCP : - csump = &((tcphdr_t *)l4hdr)->th_sum; - l4hlen = sizeof(tcphdr_t); - break; - case IPPROTO_ICMP : - csump = &((icmphdr_t *)l4hdr)->icmp_cksum; - l4hlen = 4; - sum = 0; - break; - default : - break; - } - - if (csump != NULL) { - sumsave = *csump; - *csump = 0; - } - - l4hlen = l4hlen; /* LINT */ - -#ifdef _KERNEL -# ifdef MENTAT - { - void *rp = m->b_rptr; - - if ((unsigned char *)ip > m->b_rptr && (unsigned char *)ip < m->b_wptr) - m->b_rptr = (u_char *)ip; - sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */ - m->b_rptr = rp; - sum2 = (u_short)(~sum2 & 0xffff); - } -# else /* MENTAT */ -# if defined(BSD) || defined(sun) -# if BSD >= 199103 - 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 >= 199103 - m->m_data -= hlen; -# else - m->m_off -= hlen; -# endif - /* - * Both sum and sum2 are partial sums, so combine them together. - */ - sum += ~sum2 & 0xffff; - while (sum > 0xffff) - sum = (sum & 0xffff) + (sum >> 16); - sum2 = ~sum & 0xffff; -# 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 - */ - if (sp != (u_short *)l4hdr) - sp = (u_short *)l4hdr; - - switch (l4proto) - { - case IPPROTO_UDP : - sum += *sp++; /* sport */ - sum += *sp++; /* dport */ - sum += *sp++; /* udp length */ - sum += *sp++; /* checksum */ - break; - - case IPPROTO_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++; /* checksum */ - sum += *sp++; /* urp */ - break; - case IPPROTO_ICMP : - sum = *sp++; /* type/code */ - sum += *sp++; /* checksum */ - break; - } - -# 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_cksum(1): not enough data")); - } - } - } -# endif - - len -= (l4hlen + hlen); - if (len <= 0) - goto nodata; - - while (len > 1) { - if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) { - m = m->m_next; - PANIC((!m),("fr_cksum(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_cksum(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 != 0) - 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 /* MENTAT */ -#else /* _KERNEL */ - for (; slen > 1; slen -= 2) - sum += *sp++; - if (slen) - sum += ntohs(*(u_char *)sp << 8); - while (sum > 0xffff) - sum = (sum & 0xffff) + (sum >> 16); - sum2 = (u_short)(~sum & 0xffff); -#endif /* _KERNEL */ - if (csump != NULL) - *csump = sumsave; - return sum2; -} - - -#if defined(_KERNEL) && ( ((BSD < 199103) && !defined(MENTAT)) || \ - defined(__sgi) ) && !defined(linux) -/* - * 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. 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 2.243.2.57 2005/03/28 10:47:50 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) - mb_t *m; - int off; - int len; - caddr_t cp; -{ - 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; - } -} - - -/* - * 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; - int off; - int len; - caddr_t cp; -{ - int mlen; - 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 /* (_KERNEL) && ( ((BSD < 199103) && !MENTAT) || __sgi) */ - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_findgroup */ -/* Returns: frgroup_t * - NULL = group not found, else pointer to group */ -/* Parameters: group(I) - group name to search for */ -/* unit(I) - device to which this group belongs */ -/* set(I) - which set of rules (inactive/inactive) this is */ -/* fgpp(O) - pointer to place to store pointer to the pointer */ -/* to where to add the next (last) group or where */ -/* to delete group from. */ -/* */ -/* Search amongst the defined groups for a particular group number. */ -/* ------------------------------------------------------------------------ */ -frgroup_t *fr_findgroup(group, unit, set, fgpp) -char *group; -minor_t unit; -int set; -frgroup_t ***fgpp; -{ - frgroup_t *fg, **fgp; - - /* - * Which list of groups to search in is dependant on which list of - * rules are being operated on. - */ - fgp = &ipfgroups[unit][set]; - - while ((fg = *fgp) != NULL) { - if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0) - break; - else - fgp = &fg->fg_next; - } - if (fgpp != NULL) - *fgpp = fgp; - return fg; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_addgroup */ -/* Returns: frgroup_t * - NULL == did not create group, */ -/* != NULL == pointer to the group */ -/* Parameters: num(I) - group number to add */ -/* head(I) - rule pointer that is using this as the head */ -/* flags(I) - rule flags which describe the type of rule it is */ -/* unit(I) - device to which this group will belong to */ -/* set(I) - which set of rules (inactive/inactive) this is */ -/* Write Locks: ipf_mutex */ -/* */ -/* Add a new group head, or if it already exists, increase the reference */ -/* count to it. */ -/* ------------------------------------------------------------------------ */ -frgroup_t *fr_addgroup(group, head, flags, unit, set) -char *group; -void *head; -u_32_t flags; -minor_t unit; -int set; -{ - frgroup_t *fg, **fgp; - u_32_t gflags; - - if (group == NULL) - return NULL; - - if (unit == IPL_LOGIPF && *group == '\0') - return NULL; - - fgp = NULL; - gflags = flags & FR_INOUT; - - fg = fr_findgroup(group, unit, set, &fgp); - if (fg != NULL) { - if (fg->fg_flags == 0) - fg->fg_flags = gflags; - else if (gflags != fg->fg_flags) - return NULL; - fg->fg_ref++; - return fg; - } - KMALLOC(fg, frgroup_t *); - if (fg != NULL) { - fg->fg_head = head; - fg->fg_start = NULL; - fg->fg_next = *fgp; - bcopy(group, fg->fg_name, FR_GROUPLEN); - fg->fg_flags = gflags; - fg->fg_ref = 1; - *fgp = fg; - } - return fg; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_delgroup */ -/* Returns: Nil */ -/* Parameters: group(I) - group name to delete */ -/* unit(I) - device to which this group belongs */ -/* set(I) - which set of rules (inactive/inactive) this is */ -/* Write Locks: ipf_mutex */ -/* */ -/* Attempt to delete a group head. */ -/* Only do this when its reference count reaches 0. */ -/* ------------------------------------------------------------------------ */ -void fr_delgroup(group, unit, set) -char *group; -minor_t unit; -int set; -{ - frgroup_t *fg, **fgp; - - fg = fr_findgroup(group, unit, set, &fgp); - if (fg == NULL) - return; - - fg->fg_ref--; - if (fg->fg_ref == 0) { - *fgp = fg->fg_next; - KFREE(fg); - } -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_getrulen */ -/* Returns: frentry_t * - NULL == not found, else pointer to rule n */ -/* Parameters: unit(I) - device for which to count the rule's number */ -/* flags(I) - which set of rules to find the rule in */ -/* group(I) - group name */ -/* n(I) - rule number to find */ -/* */ -/* Find rule # n in group # g and return a pointer to it. Return NULl if */ -/* group # g doesn't exist or there are less than n rules in the group. */ -/* ------------------------------------------------------------------------ */ -frentry_t *fr_getrulen(unit, group, n) -int unit; -char *group; -u_32_t n; -{ - frentry_t *fr; - frgroup_t *fg; - - fg = fr_findgroup(group, unit, fr_active, NULL); - if (fg == NULL) - return NULL; - for (fr = fg->fg_head; fr && n; fr = fr->fr_next, n--) - ; - if (n != 0) - return NULL; - return fr; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_rulen */ -/* Returns: int - >= 0 - rule number, -1 == search failed */ -/* Parameters: unit(I) - device for which to count the rule's number */ -/* fr(I) - pointer to rule to match */ -/* */ -/* Return the number for a rule on a specific filtering device. */ -/* ------------------------------------------------------------------------ */ -int fr_rulen(unit, fr) -int unit; -frentry_t *fr; -{ - frentry_t *fh; - frgroup_t *fg; - u_32_t n = 0; - - if (fr == NULL) - return -1; - fg = fr_findgroup(fr->fr_group, unit, fr_active, NULL); - if (fg == NULL) - return -1; - for (fh = fg->fg_head; fh; n++, fh = fh->fr_next) - if (fh == fr) - break; - if (fh == NULL) - return -1; - return n; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frflushlist */ -/* Returns: int - >= 0 - number of flushed rules */ -/* Parameters: set(I) - which set of rules (inactive/inactive) this is */ -/* unit(I) - device for which to flush rules */ -/* flags(I) - which set of rules to flush */ -/* nfreedp(O) - pointer to int where flush count is stored */ -/* listp(I) - pointer to list to flush pointer */ -/* Write Locks: ipf_mutex */ -/* */ -/* 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. nfreedp is needed */ -/* to store the accumulating count of rules removed, whereas the returned */ -/* value is just the number removed from the current list. The latter is */ -/* needed to correctly adjust reference counts on rules that define groups. */ -/* */ -/* NOTE: Rules not loaded from user space cannot be flushed. */ -/* ------------------------------------------------------------------------ */ -static int frflushlist(set, unit, nfreedp, listp) -int set; -minor_t unit; -int *nfreedp; -frentry_t **listp; -{ - int freed = 0, i; - frentry_t *fp; - - while ((fp = *listp) != NULL) { - if ((fp->fr_type & FR_T_BUILTIN) || - !(fp->fr_flags & FR_COPIED)) { - listp = &fp->fr_next; - continue; - } - *listp = fp->fr_next; - if (fp->fr_grp != NULL) { - i = frflushlist(set, unit, nfreedp, fp->fr_grp); - fp->fr_ref -= i; - } - - if (fp->fr_grhead != NULL) { - fr_delgroup(fp->fr_grhead, unit, set); - *fp->fr_grhead = '\0'; - } - - ASSERT(fp->fr_ref > 0); - fp->fr_next = NULL; - if (fr_derefrule(&fp) == 0) - freed++; - } - *nfreedp += freed; - return freed; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: frflush */ -/* Returns: int - >= 0 - number of flushed rules */ -/* Parameters: unit(I) - device for which to flush rules */ -/* flags(I) - which set of rules to flush */ -/* */ -/* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */ -/* and IPv6) as defined by the value of flags. */ -/* ------------------------------------------------------------------------ */ -int frflush(unit, proto, flags) -minor_t unit; -int proto, flags; -{ - int flushed = 0, set; - - WRITE_ENTER(&ipf_mutex); - bzero((char *)frcache, sizeof(frcache)); - - set = fr_active; - if ((flags & FR_INACTIVE) == FR_INACTIVE) - set = 1 - set; - - if (flags & FR_OUTQUE) { - if (proto == 0 || proto == 6) { - (void) frflushlist(set, unit, - &flushed, &ipfilter6[1][set]); - (void) frflushlist(set, unit, - &flushed, &ipacct6[1][set]); - } - if (proto == 0 || proto == 4) { - (void) frflushlist(set, unit, - &flushed, &ipfilter[1][set]); - (void) frflushlist(set, unit, - &flushed, &ipacct[1][set]); - } - } - if (flags & FR_INQUE) { - if (proto == 0 || proto == 6) { - (void) frflushlist(set, unit, - &flushed, &ipfilter6[0][set]); - (void) frflushlist(set, unit, - &flushed, &ipacct6[0][set]); - } - if (proto == 0 || proto == 4) { - (void) frflushlist(set, unit, - &flushed, &ipfilter[0][set]); - (void) frflushlist(set, unit, - &flushed, &ipacct[0][set]); - } - } - RWLOCK_EXIT(&ipf_mutex); - - if (unit == IPL_LOGIPF) { - int tmp; - - tmp = frflush(IPL_LOGCOUNT, proto, flags); - if (tmp >= 0) - flushed += tmp; - } - return flushed; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: memstr */ -/* Returns: char * - NULL if failed, != NULL pointer to matching bytes */ -/* Parameters: src(I) - pointer to byte sequence to match */ -/* dst(I) - pointer to byte sequence to search */ -/* slen(I) - match length */ -/* dlen(I) - length available to search in */ -/* */ -/* Search dst for a sequence of bytes matching those at src and extend for */ -/* slen bytes. */ -/* ------------------------------------------------------------------------ */ -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; -} -/* ------------------------------------------------------------------------ */ -/* Function: fr_fixskip */ -/* Returns: Nil */ -/* Parameters: listp(IO) - pointer to start of list with skip rule */ -/* rp(I) - rule added/removed with skip in it. */ -/* addremove(I) - adjustment (-1/+1) to make to skip count, */ -/* depending on whether a rule was just added */ -/* or removed. */ -/* */ -/* Adjust all the rules in a list which would have skip'd past the position */ -/* where we are inserting to skip to the right place given the change. */ -/* ------------------------------------------------------------------------ */ -void fr_fixskip(listp, rp, addremove) -frentry_t **listp, *rp; -int addremove; -{ - int rules, rn; - frentry_t *fp; - - rules = 0; - for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next) - rules++; - - if (!fp) - return; - - for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++) - if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules)) - fp->fr_arg += addremove; -} - - -#ifdef _KERNEL -/* ------------------------------------------------------------------------ */ -/* Function: count4bits */ -/* Returns: int - >= 0 - number of consecutive bits in input */ -/* Parameters: ip(I) - 32bit IP address */ -/* */ -/* IPv4 ONLY */ -/* 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 count4bits(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; -} - - -# if 0 -/* ------------------------------------------------------------------------ */ -/* Function: count6bits */ -/* Returns: int - >= 0 - number of consecutive bits in input */ -/* Parameters: msk(I) - pointer to start of IPv6 bitmask */ -/* */ -/* IPv6 ONLY */ -/* count consecutive 1's in bit mask. */ -/* ------------------------------------------------------------------------ */ -int count6bits(msk) -u_32_t *msk; -{ - int i = 0, k; - u_32_t j; - - for (k = 3; k >= 0; k--) - if (msk[k] == 0xffffffff) - i += 32; - else { - for (j = msk[k]; j; j <<= 1) - if (j & 0x80000000) - i++; - } - return i; -} -# endif -#endif /* _KERNEL */ - - -/* ------------------------------------------------------------------------ */ -/* Function: frsynclist */ -/* Returns: void */ -/* Parameters: fr(I) - start of filter list to sync interface names for */ -/* ifp(I) - interface pointer for limiting sync lookups */ -/* Write Locks: ipf_mutex */ -/* */ -/* Walk through a list of filter rules and resolve any interface names into */ -/* pointers. Where dynamic addresses are used, also update the IP address */ -/* used in the rule. The interface pointer is used to limit the lookups to */ -/* a specific set of matching names if it is non-NULL. */ -/* ------------------------------------------------------------------------ */ -static void frsynclist(fr, ifp) -frentry_t *fr; -void *ifp; -{ - frdest_t *fdp; - int v, i; - - for (; fr; fr = fr->fr_next) { - v = fr->fr_v; - - /* - * Lookup all the interface names that are part of the rule. - */ - for (i = 0; i < 4; i++) { - if ((ifp != NULL) && (fr->fr_ifas[i] != ifp)) - continue; - fr->fr_ifas[i] = fr_resolvenic(fr->fr_ifnames[i], v); - } - - if (fr->fr_type == FR_T_IPF) { - if (fr->fr_satype != FRI_NORMAL && - fr->fr_satype != FRI_LOOKUP) { - (void)fr_ifpaddr(v, fr->fr_satype, - fr->fr_ifas[fr->fr_sifpidx], - &fr->fr_src, &fr->fr_smsk); - } - if (fr->fr_datype != FRI_NORMAL && - fr->fr_datype != FRI_LOOKUP) { - (void)fr_ifpaddr(v, fr->fr_datype, - fr->fr_ifas[fr->fr_difpidx], - &fr->fr_dst, &fr->fr_dmsk); - } - } - - fdp = &fr->fr_tifs[0]; - if ((ifp == NULL) || (fdp->fd_ifp == ifp)) - fr_resolvedest(fdp, v); - - fdp = &fr->fr_tifs[1]; - if ((ifp == NULL) || (fdp->fd_ifp == ifp)) - fr_resolvedest(fdp, v); - - fdp = &fr->fr_dif; - if ((ifp == NULL) || (fdp->fd_ifp == ifp)) { - fr_resolvedest(fdp, v); - - fr->fr_flags &= ~FR_DUP; - if ((fdp->fd_ifp != (void *)-1) && - (fdp->fd_ifp != NULL)) - fr->fr_flags |= FR_DUP; - } - -#ifdef IPFILTER_LOOKUP - if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP && - fr->fr_srcptr == NULL) { - fr->fr_srcptr = fr_resolvelookup(fr->fr_srctype, - fr->fr_srcnum, - &fr->fr_srcfunc); - } - if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP && - fr->fr_dstptr == NULL) { - fr->fr_dstptr = fr_resolvelookup(fr->fr_dsttype, - fr->fr_dstnum, - &fr->fr_dstfunc); - } -#endif - } -} - - -#ifdef _KERNEL -/* ------------------------------------------------------------------------ */ -/* Function: frsync */ -/* Returns: void */ -/* Parameters: Nil */ -/* */ -/* frsync() is called when we suspect that the interface list or */ -/* information about interfaces (like IP#) has changed. Go through all */ -/* filter rules, NAT entries and the state table and check if anything */ -/* needs to be changed/updated. */ -/* ------------------------------------------------------------------------ */ -void frsync(ifp) -void *ifp; -{ - int i; - -# if !SOLARIS - fr_natsync(ifp); - fr_statesync(ifp); -# endif - - WRITE_ENTER(&ipf_mutex); - frsynclist(ipacct[0][fr_active], ifp); - frsynclist(ipacct[1][fr_active], ifp); - frsynclist(ipfilter[0][fr_active], ifp); - frsynclist(ipfilter[1][fr_active], ifp); - frsynclist(ipacct6[0][fr_active], ifp); - frsynclist(ipacct6[1][fr_active], ifp); - frsynclist(ipfilter6[0][fr_active], ifp); - frsynclist(ipfilter6[1][fr_active], ifp); - - for (i = 0; i < IPL_LOGSIZE; i++) { - frgroup_t *g; - - for (g = ipfgroups[i][0]; g != NULL; g = g->fg_next) - frsynclist(g->fg_start, ifp); - for (g = ipfgroups[i][1]; g != NULL; g = g->fg_next) - frsynclist(g->fg_start, ifp); - } - RWLOCK_EXIT(&ipf_mutex); -} - - -/* - * In the functions below, bcopy() is called because the pointer being - * copied _from_ in this instance is a pointer to a char buf (which could - * end up being unaligned) and on the kernel's local stack. - */ -/* ------------------------------------------------------------------------ */ -/* Function: copyinptr */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: src(I) - pointer to the source address */ -/* dst(I) - destination address */ -/* size(I) - number of bytes to copy */ -/* */ -/* Copy a block of data in from user space, given a pointer to the pointer */ -/* to start copying from (src) and a pointer to where to store it (dst). */ -/* NB: src - pointer to user space pointer, dst - kernel space pointer */ -/* ------------------------------------------------------------------------ */ -int copyinptr(src, dst, size) -void *src, *dst; -size_t size; -{ - caddr_t ca; - int err; - -# if SOLARIS - err = COPYIN(src, (caddr_t)&ca, sizeof(ca)); - if (err != 0) - return err; -# else - bcopy(src, (caddr_t)&ca, sizeof(ca)); -# endif - err = COPYIN(ca, dst, size); - return err; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: copyoutptr */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: src(I) - pointer to the source address */ -/* dst(I) - destination address */ -/* size(I) - number of bytes to copy */ -/* */ -/* Copy a block of data out to user space, given a pointer to the pointer */ -/* to start copying from (src) and a pointer to where to store it (dst). */ -/* NB: src - kernel space pointer, dst - pointer to user space pointer. */ -/* ------------------------------------------------------------------------ */ -int copyoutptr(src, dst, size) -void *src, *dst; -size_t size; -{ - caddr_t ca; - int err; - -# if SOLARIS - err = COPYIN(dst, (caddr_t)&ca, sizeof(ca)); - if (err != 0) - return err; -# else - bcopy(dst, (caddr_t)&ca, sizeof(ca)); -# endif - err = COPYOUT(src, ca, size); - return err; -} -#endif - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_lock */ -/* Returns: (void) */ -/* Parameters: data(I) - pointer to lock value to set */ -/* lockp(O) - pointer to location to store old lock value */ -/* */ -/* Get the new value for the lock integer, set it and return the old value */ -/* in *lockp. */ -/* ------------------------------------------------------------------------ */ -void fr_lock(data, lockp) -caddr_t data; -int *lockp; -{ - int arg; - - BCOPYIN(data, (caddr_t)&arg, sizeof(arg)); - BCOPYOUT((caddr_t)lockp, data, sizeof(*lockp)); - *lockp = arg; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_getstat */ -/* Returns: Nil */ -/* Parameters: fiop(I) - pointer to ipfilter stats structure */ -/* */ -/* Stores a copy of current pointers, counters, etc, in the friostat */ -/* structure. */ -/* ------------------------------------------------------------------------ */ -void fr_getstat(fiop) -friostat_t *fiop; -{ - int i, j; - - bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2); - fiop->f_locks[IPL_LOGSTATE] = fr_state_lock; - fiop->f_locks[IPL_LOGNAT] = fr_nat_lock; - fiop->f_locks[IPL_LOGIPF] = fr_frag_lock; - fiop->f_locks[IPL_LOGAUTH] = fr_auth_lock; - - for (i = 0; i < 2; i++) - for (j = 0; j < 2; j++) { - fiop->f_ipf[i][j] = ipfilter[i][j]; - fiop->f_acct[i][j] = ipacct[i][j]; - fiop->f_ipf6[i][j] = ipfilter6[i][j]; - fiop->f_acct6[i][j] = ipacct6[i][j]; - } - - fiop->f_ticks = fr_ticks; - fiop->f_active = fr_active; - fiop->f_froute[0] = fr_frouteok[0]; - fiop->f_froute[1] = fr_frouteok[1]; - - fiop->f_running = fr_running; - for (i = 0; i < IPL_LOGSIZE; i++) { - fiop->f_groups[i][0] = ipfgroups[i][0]; - fiop->f_groups[i][1] = ipfgroups[i][1]; - } -#ifdef IPFILTER_LOG - fiop->f_logging = 1; -#else - fiop->f_logging = 0; -#endif - fiop->f_defpass = fr_pass; - fiop->f_features = fr_features; - (void) strncpy(fiop->f_version, ipfilter_version, - sizeof(fiop->f_version)); -} - - -#ifdef USE_INET6 -int icmptoicmp6types[ICMP_MAXTYPE+1] = { - ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */ - -1, /* 1: UNUSED */ - -1, /* 2: UNUSED */ - ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */ - -1, /* 4: ICMP_SOURCEQUENCH */ - ND_REDIRECT, /* 5: ICMP_REDIRECT */ - -1, /* 6: UNUSED */ - -1, /* 7: UNUSED */ - ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */ - -1, /* 9: UNUSED */ - -1, /* 10: UNUSED */ - ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */ - ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */ - -1, /* 13: ICMP_TSTAMP */ - -1, /* 14: ICMP_TSTAMPREPLY */ - -1, /* 15: ICMP_IREQ */ - -1, /* 16: ICMP_IREQREPLY */ - -1, /* 17: ICMP_MASKREQ */ - -1, /* 18: ICMP_MASKREPLY */ -}; - - -int icmptoicmp6unreach[ICMP_MAX_UNREACH] = { - ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */ - ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */ - -1, /* 2: ICMP_UNREACH_PROTOCOL */ - ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */ - -1, /* 4: ICMP_UNREACH_NEEDFRAG */ - ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */ - ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */ - ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */ - -1, /* 8: ICMP_UNREACH_ISOLATED */ - ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */ - ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */ - -1, /* 11: ICMP_UNREACH_TOSNET */ - -1, /* 12: ICMP_UNREACH_TOSHOST */ - ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */ -}; -int icmpreplytype6[ICMP6_MAXTYPE + 1]; -#endif - -int icmpreplytype4[ICMP_MAXTYPE + 1]; - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_matchicmpqueryreply */ -/* Returns: int - 1 if "icmp" is a valid reply to "ic" else 0. */ -/* Parameters: v(I) - IP protocol version (4 or 6) */ -/* ic(I) - ICMP information */ -/* icmp(I) - ICMP packet header */ -/* rev(I) - direction (0 = forward/1 = reverse) of packet */ -/* */ -/* Check if the ICMP packet defined by the header pointed to by icmp is a */ -/* reply to one as described by what's in ic. If it is a match, return 1, */ -/* else return 0 for no match. */ -/* ------------------------------------------------------------------------ */ -int fr_matchicmpqueryreply(v, ic, icmp, rev) -int v; -icmpinfo_t *ic; -icmphdr_t *icmp; -int rev; -{ - int ictype; - - ictype = ic->ici_type; - - if (v == 4) { - /* - * If we matched its type on the way in, then when going out - * it will still be the same type. - */ - if ((!rev && (icmp->icmp_type == ictype)) || - (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) { - if (icmp->icmp_type != ICMP_ECHOREPLY) - return 1; - if (icmp->icmp_id == ic->ici_id) - return 1; - } - } -#ifdef USE_INET6 - else if (v == 6) { - if ((!rev && (icmp->icmp_type == ictype)) || - (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) { - if (icmp->icmp_type != ICMP6_ECHO_REPLY) - return 1; - if (icmp->icmp_id == ic->ici_id) - return 1; - } - } -#endif - return 0; -} - - -#ifdef IPFILTER_LOOKUP -/* ------------------------------------------------------------------------ */ -/* Function: fr_resolvelookup */ -/* Returns: void * - NULL = failure, else success. */ -/* Parameters: type(I) - type of lookup these parameters are for. */ -/* number(I) - table number to use when searching */ -/* funcptr(IO) - pointer to pointer for storing IP address */ -/* searching function. */ -/* */ -/* Search for the "table" number passed in amongst those configured for */ -/* that particular type. If the type is recognised then the function to */ -/* call to do the IP address search will be change, regardless of whether */ -/* or not the "table" number exists. */ -/* ------------------------------------------------------------------------ */ -static void *fr_resolvelookup(type, number, funcptr) -u_int type, number; -lookupfunc_t *funcptr; -{ - char name[FR_GROUPLEN]; - iphtable_t *iph; - ip_pool_t *ipo; - void *ptr; - -#if defined(SNPRINTF) && defined(_KERNEL) - SNPRINTF(name, sizeof(name), "%u", number); -#else - (void) sprintf(name, "%u", number); -#endif - - READ_ENTER(&ip_poolrw); - - switch (type) - { - case IPLT_POOL : -# if (defined(__osf__) && defined(_KERNEL)) - ptr = NULL; - *funcptr = NULL; -# else - ipo = ip_pool_find(IPL_LOGIPF, name); - ptr = ipo; - if (ipo != NULL) { - ATOMIC_INC32(ipo->ipo_ref); - } - *funcptr = ip_pool_search; -# endif - break; - case IPLT_HASH : - iph = fr_findhtable(IPL_LOGIPF, name); - ptr = iph; - if (iph != NULL) { - ATOMIC_INC32(iph->iph_ref); - } - *funcptr = fr_iphmfindip; - break; - default: - ptr = NULL; - *funcptr = NULL; - break; - } - RWLOCK_EXIT(&ip_poolrw); - - return ptr; -} -#endif - - -/* ------------------------------------------------------------------------ */ -/* Function: frrequest */ -/* Returns: int - 0 == success, > 0 == errno value */ -/* Parameters: unit(I) - device for which this is for */ -/* req(I) - ioctl command (SIOC*) */ -/* data(I) - pointr to ioctl data */ -/* set(I) - 1 or 0 (filter set) */ -/* makecopy(I) - flag indicating whether data points to a rule */ -/* in kernel space & hence doesn't need copying. */ -/* */ -/* This function handles all the requests which operate on the list of */ -/* filter rules. This includes adding, deleting, insertion. It is also */ -/* responsible for creating groups when a "head" rule is loaded. Interface */ -/* names are resolved here and other sanity checks are made on the content */ -/* of the rule structure being loaded. If a rule has user defined timeouts */ -/* then make sure they are created and initialised before exiting. */ -/* ------------------------------------------------------------------------ */ -int frrequest(unit, req, data, set, makecopy) -int unit; -ioctlcmd_t req; -int set, makecopy; -caddr_t data; -{ - frentry_t frd, *fp, *f, **fprev, **ftail; - int error = 0, in, v; - void *ptr, *uptr; - u_int *p, *pp; - frgroup_t *fg; - char *group; - - fg = NULL; - fp = &frd; - if (makecopy != 0) { - error = fr_inobj(data, fp, IPFOBJ_FRENTRY); - if (error) - return EFAULT; - if ((fp->fr_flags & FR_T_BUILTIN) != 0) - return EINVAL; - fp->fr_ref = 0; - fp->fr_flags |= FR_COPIED; - } else { - fp = (frentry_t *)data; - if ((fp->fr_type & FR_T_BUILTIN) == 0) - return EINVAL; - fp->fr_flags &= ~FR_COPIED; - } - - if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) || - ((fp->fr_dsize != 0) && (fp->fr_data == NULL))) - return EINVAL; - - v = fp->fr_v; - uptr = fp->fr_data; - - /* - * Only filter rules for IPv4 or IPv6 are accepted. - */ - if (v == 4) - /*EMPTY*/; -#ifdef USE_INET6 - else if (v == 6) - /*EMPTY*/; -#endif - else { - return EINVAL; - } - - /* - * If the rule is being loaded from user space, i.e. we had to copy it - * into kernel space, then do not trust the function pointer in the - * rule. - */ - if ((makecopy == 1) && (fp->fr_func != NULL)) { - if (fr_findfunc(fp->fr_func) == NULL) - return ESRCH; - error = fr_funcinit(fp); - if (error != 0) - return error; - } - - ptr = NULL; - /* - * Check that the group number does exist and that its use (in/out) - * matches what the rule is. - */ - if (!strncmp(fp->fr_grhead, "0", FR_GROUPLEN)) - *fp->fr_grhead = '\0'; - group = fp->fr_group; - if (!strncmp(group, "0", FR_GROUPLEN)) - *group = '\0'; - - if (FR_ISACCOUNT(fp->fr_flags)) - unit = IPL_LOGCOUNT; - - if ((req != (int)SIOCZRLST) && (*group != '\0')) { - fg = fr_findgroup(group, unit, set, NULL); - if (fg == NULL) - return ESRCH; - if (fg->fg_flags == 0) - fg->fg_flags = fp->fr_flags & FR_INOUT; - else if (fg->fg_flags != (fp->fr_flags & FR_INOUT)) - return ESRCH; - } - - in = (fp->fr_flags & FR_INQUE) ? 0 : 1; - - /* - * Work out which rule list this change is being applied to. - */ - ftail = NULL; - fprev = NULL; - if (unit == IPL_LOGAUTH) - fprev = &ipauth; - else if (v == 4) { - if (FR_ISACCOUNT(fp->fr_flags)) - fprev = &ipacct[in][set]; - else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0) - fprev = &ipfilter[in][set]; - } else if (v == 6) { - if (FR_ISACCOUNT(fp->fr_flags)) - fprev = &ipacct6[in][set]; - else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0) - fprev = &ipfilter6[in][set]; - } - if (fprev == NULL) - return ESRCH; - - if (*group != '\0') { - if (!fg && !(fg = fr_findgroup(group, unit, set, NULL))) - return ESRCH; - fprev = &fg->fg_start; - } - - for (f = *fprev; (f = *fprev) != NULL; fprev = &f->fr_next) - if (fp->fr_collect <= f->fr_collect) - break; - ftail = fprev; - - /* - * Copy in extra data for the rule. - */ - if (fp->fr_dsize != 0) { - if (makecopy != 0) { - KMALLOCS(ptr, void *, fp->fr_dsize); - if (!ptr) - return ENOMEM; - error = COPYIN(uptr, ptr, fp->fr_dsize); - } else { - ptr = uptr; - error = 0; - } - if (error != 0) { - KFREES(ptr, fp->fr_dsize); - return ENOMEM; - } - fp->fr_data = ptr; - } else - fp->fr_data = NULL; - - /* - * Perform per-rule type sanity checks of their members. - */ - switch (fp->fr_type & ~FR_T_BUILTIN) - { -#if defined(IPFILTER_BPF) - case FR_T_BPFOPC : - if (fp->fr_dsize == 0) - return EINVAL; - if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) { - if (makecopy && fp->fr_data != NULL) { - KFREES(fp->fr_data, fp->fr_dsize); - } - return EINVAL; - } - break; -#endif - case FR_T_IPF : - if (fp->fr_dsize != sizeof(fripf_t)) - return EINVAL; - - /* - * Allowing a rule with both "keep state" and "with oow" is - * pointless because adding a state entry to the table will - * fail with the out of window (oow) flag set. - */ - if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW)) - return EINVAL; - - switch (fp->fr_satype) - { - case FRI_BROADCAST : - case FRI_DYNAMIC : - case FRI_NETWORK : - case FRI_NETMASKED : - case FRI_PEERADDR : - if (fp->fr_sifpidx < 0 || fp->fr_sifpidx > 3) { - if (makecopy && fp->fr_data != NULL) { - KFREES(fp->fr_data, fp->fr_dsize); - } - return EINVAL; - } - break; -#ifdef IPFILTER_LOOKUP - case FRI_LOOKUP : - fp->fr_srcptr = fr_resolvelookup(fp->fr_srctype, - fp->fr_srcnum, - &fp->fr_srcfunc); - break; -#endif - default : - break; - } - - switch (fp->fr_datype) - { - case FRI_BROADCAST : - case FRI_DYNAMIC : - case FRI_NETWORK : - case FRI_NETMASKED : - case FRI_PEERADDR : - if (fp->fr_difpidx < 0 || fp->fr_difpidx > 3) { - if (makecopy && fp->fr_data != NULL) { - KFREES(fp->fr_data, fp->fr_dsize); - } - return EINVAL; - } - break; -#ifdef IPFILTER_LOOKUP - case FRI_LOOKUP : - fp->fr_dstptr = fr_resolvelookup(fp->fr_dsttype, - fp->fr_dstnum, - &fp->fr_dstfunc); - break; -#endif - default : - - break; - } - break; - case FR_T_NONE : - break; - case FR_T_CALLFUNC : - break; - case FR_T_COMPIPF : - break; - default : - if (makecopy && fp->fr_data != NULL) { - KFREES(fp->fr_data, fp->fr_dsize); - } - return EINVAL; - } - - /* - * Lookup all the interface names that are part of the rule. - */ - frsynclist(fp, NULL); - fp->fr_statecnt = 0; - - /* - * Look for an existing matching filter rule, but don't include the - * next or interface pointer in the comparison (fr_next, fr_ifa). - * This elminates rules which are indentical being loaded. Checksum - * the constant part of the filter rule to make comparisons quicker - * (this meaning no pointers are included). - */ - for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum; - p < pp; p++) - fp->fr_cksum += *p; - pp = (u_int *)(fp->fr_caddr + fp->fr_dsize); - for (p = (u_int *)fp->fr_data; p < pp; p++) - fp->fr_cksum += *p; - - WRITE_ENTER(&ipf_mutex); - bzero((char *)frcache, sizeof(frcache)); - - for (; (f = *ftail) != NULL; ftail = &f->fr_next) - if ((fp->fr_cksum == f->fr_cksum) && - (f->fr_dsize == fp->fr_dsize) && - !bcmp((char *)&f->fr_func, - (char *)&fp->fr_func, FR_CMPSIZ) && - (!ptr || !f->fr_data || - !bcmp((char *)ptr, (char *)f->fr_data, f->fr_dsize))) - break; - - /* - * If zero'ing statistics, copy current to caller and zero. - */ - if (req == (ioctlcmd_t)SIOCZRLST) { - if (f == NULL) - error = ESRCH; - else { - /* - * Copy and reduce lock because of impending copyout. - * Well we should, but if we do then the atomicity of - * this call and the correctness of fr_hits and - * fr_bytes cannot be guaranteed. As it is, this code - * only resets them to 0 if they are successfully - * copied out into user space. - */ - bcopy((char *)f, (char *)fp, sizeof(*f)); - /* MUTEX_DOWNGRADE(&ipf_mutex); */ - - /* - * When we copy this rule back out, set the data - * pointer to be what it was in user space. - */ - fp->fr_data = uptr; - error = fr_outobj(data, fp, IPFOBJ_FRENTRY); - - if (error == 0) { - if ((f->fr_dsize != 0) && (uptr != NULL)) - error = COPYOUT(f->fr_data, uptr, - f->fr_dsize); - if (error == 0) { - f->fr_hits = 0; - f->fr_bytes = 0; - } - } - } - - if ((ptr != NULL) && (makecopy != 0)) { - KFREES(ptr, fp->fr_dsize); - } - RWLOCK_EXIT(&ipf_mutex); - return error; - } - - if (!f) { - if (req == (ioctlcmd_t)SIOCINAFR || - req == (ioctlcmd_t)SIOCINIFR) { - ftail = fprev; - if (fp->fr_hits != 0) { - while (--fp->fr_hits && (f = *ftail)) - ftail = &f->fr_next; - } - f = NULL; - ptr = NULL; - error = 0; - } - } - - /* - * Request to remove a rule. - */ - if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR) { - if (!f) - error = ESRCH; - else { - /* - * Do not allow activity from user space to interfere - * with rules not loaded that way. - */ - if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) { - error = EPERM; - goto done; - } - - /* - * Return EBUSY if the rule is being reference by - * something else (eg state information. - */ - if (f->fr_ref > 1) { - error = EBUSY; - goto done; - } -#ifdef IPFILTER_SCAN - if (f->fr_isctag[0] != '\0' && - (f->fr_isc != (struct ipscan *)-1)) - ipsc_detachfr(f); -#endif - if ((fg != NULL) && (fg->fg_head != NULL)) - fg->fg_head->fr_ref--; - if (unit == IPL_LOGAUTH) { - error = fr_preauthcmd(req, f, ftail); - goto done; - } - if (*f->fr_grhead != '\0') - fr_delgroup(f->fr_grhead, unit, set); - fr_fixskip(fprev, f, -1); - *ftail = f->fr_next; - f->fr_next = NULL; - (void)fr_derefrule(&f); - } - } else { - /* - * Not removing, so we must be adding/inserting a rule. - */ - if (f) - error = EEXIST; - else { - if (unit == IPL_LOGAUTH) { - error = fr_preauthcmd(req, fp, ftail); - goto done; - } - if (makecopy) { - KMALLOC(f, frentry_t *); - } else - f = fp; - if (f != NULL) { - if (fg != NULL && fg->fg_head!= NULL ) - fg->fg_head->fr_ref++; - if (fp != f) - bcopy((char *)fp, (char *)f, - sizeof(*f)); - MUTEX_NUKE(&f->fr_lock); - MUTEX_INIT(&f->fr_lock, "filter rule lock"); -#ifdef IPFILTER_SCAN - if (f->fr_isctag[0] != '\0' && - ipsc_attachfr(f)) - f->fr_isc = (struct ipscan *)-1; -#endif - f->fr_hits = 0; - if (makecopy != 0) - f->fr_ref = 1; - f->fr_next = *ftail; - *ftail = f; - if (req == (ioctlcmd_t)SIOCINIFR || - req == (ioctlcmd_t)SIOCINAFR) - fr_fixskip(fprev, f, 1); - f->fr_grp = NULL; - group = f->fr_grhead; - if (*group != '\0') { - fg = fr_addgroup(group, f, f->fr_flags, - unit, set); - if (fg != NULL) - f->fr_grp = &fg->fg_start; - } - } else - error = ENOMEM; - } - } -done: - RWLOCK_EXIT(&ipf_mutex); - if ((ptr != NULL) && (error != 0) && (makecopy != 0)) { - KFREES(ptr, fp->fr_dsize); - } - return (error); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_funcinit */ -/* Returns: int - 0 == success, else ESRCH: cannot resolve rule details */ -/* Parameters: fr(I) - pointer to filter rule */ -/* */ -/* If a rule is a call rule, then check if the function it points to needs */ -/* an init function to be called now the rule has been loaded. */ -/* ------------------------------------------------------------------------ */ -static int fr_funcinit(fr) -frentry_t *fr; -{ - ipfunc_resolve_t *ft; - int err; - - err = ESRCH; - - for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++) - if (ft->ipfu_addr == fr->fr_func) { - err = 0; - if (ft->ipfu_init != NULL) - err = (*ft->ipfu_init)(fr); - break; - } - return err; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_findfunc */ -/* Returns: ipfunc_t - pointer to function if found, else NULL */ -/* Parameters: funcptr(I) - function pointer to lookup */ -/* */ -/* Look for a function in the table of known functions. */ -/* ------------------------------------------------------------------------ */ -static ipfunc_t fr_findfunc(funcptr) -ipfunc_t funcptr; -{ - ipfunc_resolve_t *ft; - - for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++) - if (ft->ipfu_addr == funcptr) - return funcptr; - return NULL; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_resolvefunc */ -/* Returns: int - 0 == success, else error */ -/* Parameters: data(IO) - ioctl data pointer to ipfunc_resolve_t struct */ -/* */ -/* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */ -/* This will either be the function name (if the pointer is set) or the */ -/* function pointer if the name is set. When found, fill in the other one */ -/* so that the entire, complete, structure can be copied back to user space.*/ -/* ------------------------------------------------------------------------ */ -int fr_resolvefunc(data) -void *data; -{ - ipfunc_resolve_t res, *ft; - - BCOPYIN(data, &res, sizeof(res)); - - if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') { - for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++) - if (strncmp(res.ipfu_name, ft->ipfu_name, - sizeof(res.ipfu_name)) == 0) { - res.ipfu_addr = ft->ipfu_addr; - res.ipfu_init = ft->ipfu_init; - if (COPYOUT(&res, data, sizeof(res)) != 0) - return EFAULT; - return 0; - } - } - if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') { - for (ft = fr_availfuncs; ft->ipfu_addr != NULL; ft++) - if (ft->ipfu_addr == res.ipfu_addr) { - (void) strncpy(res.ipfu_name, ft->ipfu_name, - sizeof(res.ipfu_name)); - res.ipfu_init = ft->ipfu_init; - if (COPYOUT(&res, data, sizeof(res)) != 0) - return EFAULT; - return 0; - } - } - return ESRCH; -} - - -#if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && !defined(__FreeBSD__)) || \ - (defined(__FreeBSD__) && (__FreeBSD_version < 490000)) || \ - (defined(__NetBSD__) && (__NetBSD_Version__ < 105000000)) || \ - (defined(__OpenBSD__) && (OpenBSD < 200006)) -/* - * From: NetBSD - * ppsratecheck(): packets (or events) per second limitation. - */ -int -ppsratecheck(lasttime, curpps, maxpps) - struct timeval *lasttime; - int *curpps; - int maxpps; /* maximum pps allowed */ -{ - struct timeval tv, delta; - int rv; - - GETKTIME(&tv); - - delta.tv_sec = tv.tv_sec - lasttime->tv_sec; - delta.tv_usec = tv.tv_usec - lasttime->tv_usec; - if (delta.tv_usec < 0) { - delta.tv_sec--; - delta.tv_usec += 1000000; - } - - /* - * check for 0,0 is so that the message will be seen at least once. - * if more than one second have passed since the last update of - * lasttime, reset the counter. - * - * we do increment *curpps even in *curpps < maxpps case, as some may - * try to use *curpps for stat purposes as well. - */ - if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) || - delta.tv_sec >= 1) { - *lasttime = tv; - *curpps = 0; - rv = 1; - } else if (maxpps < 0) - rv = 1; - else if (*curpps < maxpps) - rv = 1; - else - rv = 0; - *curpps = *curpps + 1; - - return (rv); -} -#endif - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_derefrule */ -/* Returns: int - 0 == rule freed up, else rule not freed */ -/* Parameters: fr(I) - pointer to filter rule */ -/* */ -/* Decrement the reference counter to a rule by one. If it reaches zero, */ -/* free it and any associated storage space being used by it. */ -/* ------------------------------------------------------------------------ */ -int fr_derefrule(frp) -frentry_t **frp; -{ - frentry_t *fr; - - fr = *frp; - - MUTEX_ENTER(&fr->fr_lock); - fr->fr_ref--; - if (fr->fr_ref == 0) { - MUTEX_EXIT(&fr->fr_lock); - MUTEX_DESTROY(&fr->fr_lock); - -#ifdef IPFILTER_LOOKUP - if (fr->fr_type == FR_T_IPF && fr->fr_satype == FRI_LOOKUP) - ip_lookup_deref(fr->fr_srctype, fr->fr_srcptr); - if (fr->fr_type == FR_T_IPF && fr->fr_datype == FRI_LOOKUP) - ip_lookup_deref(fr->fr_dsttype, fr->fr_dstptr); -#endif - - if (fr->fr_dsize) { - KFREES(fr->fr_data, fr->fr_dsize); - } - if ((fr->fr_flags & FR_COPIED) != 0) { - KFREE(fr); - return 0; - } - return 1; - } else { - MUTEX_EXIT(&fr->fr_lock); - } - *frp = NULL; - return -1; -} - - -#ifdef IPFILTER_LOOKUP -/* ------------------------------------------------------------------------ */ -/* Function: fr_grpmapinit */ -/* Returns: int - 0 == success, else ESRCH because table entry not found*/ -/* Parameters: fr(I) - pointer to rule to find hash table for */ -/* */ -/* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr. */ -/* fr_ptr is later used by fr_srcgrpmap and fr_dstgrpmap. */ -/* ------------------------------------------------------------------------ */ -static int fr_grpmapinit(fr) -frentry_t *fr; -{ - char name[FR_GROUPLEN]; - iphtable_t *iph; - -#if defined(SNPRINTF) && defined(_KERNEL) - SNPRINTF(name, sizeof(name), "%d", fr->fr_arg); -#else - (void) sprintf(name, "%d", fr->fr_arg); -#endif - iph = fr_findhtable(IPL_LOGIPF, name); - if (iph == NULL) - return ESRCH; - if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT)) - return ESRCH; - fr->fr_ptr = iph; - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_srcgrpmap */ -/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */ -/* Parameters: fin(I) - pointer to packet information */ -/* passp(IO) - pointer to current/new filter decision (unused) */ -/* */ -/* Look for a rule group head in a hash table, using the source address as */ -/* the key, and descend into that group and continue matching rules against */ -/* the packet. */ -/* ------------------------------------------------------------------------ */ -frentry_t *fr_srcgrpmap(fin, passp) -fr_info_t *fin; -u_32_t *passp; -{ - frgroup_t *fg; - void *rval; - - rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_src); - if (rval == NULL) - return NULL; - - fg = rval; - fin->fin_fr = fg->fg_start; - (void) fr_scanlist(fin, *passp); - return fin->fin_fr; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_dstgrpmap */ -/* Returns: frentry_t * - pointer to "new last matching" rule or NULL */ -/* Parameters: fin(I) - pointer to packet information */ -/* passp(IO) - pointer to current/new filter decision (unused) */ -/* */ -/* Look for a rule group head in a hash table, using the destination */ -/* address as the key, and descend into that group and continue matching */ -/* rules against the packet. */ -/* ------------------------------------------------------------------------ */ -frentry_t *fr_dstgrpmap(fin, passp) -fr_info_t *fin; -u_32_t *passp; -{ - frgroup_t *fg; - void *rval; - - rval = fr_iphmfindgroup(fin->fin_fr->fr_ptr, &fin->fin_dst); - if (rval == NULL) - return NULL; - - fg = rval; - fin->fin_fr = fg->fg_start; - (void) fr_scanlist(fin, *passp); - return fin->fin_fr; -} -#endif /* IPFILTER_LOOKUP */ - -/* - * Queue functions - * =============== - * These functions manage objects on queues for efficient timeouts. There are - * a number of system defined queues as well as user defined timeouts. It is - * expected that a lock is held in the domain in which the queue belongs - * (i.e. either state or NAT) when calling any of these functions that prevents - * fr_freetimeoutqueue() from being called at the same time as any other. - */ - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_addtimeoutqueue */ -/* Returns: struct ifqtq * - NULL if malloc fails, else pointer to */ -/* timeout queue with given interval. */ -/* Parameters: parent(I) - pointer to pointer to parent node of this list */ -/* of interface queues. */ -/* seconds(I) - timeout value in seconds for this queue. */ -/* */ -/* This routine first looks for a timeout queue that matches the interval */ -/* being requested. If it finds one, increments the reference counter and */ -/* returns a pointer to it. If none are found, it allocates a new one and */ -/* inserts it at the top of the list. */ -/* */ -/* Locking. */ -/* It is assumed that the caller of this function has an appropriate lock */ -/* held (exclusively) in the domain that encompases 'parent'. */ -/* ------------------------------------------------------------------------ */ -ipftq_t *fr_addtimeoutqueue(parent, seconds) -ipftq_t **parent; -u_int seconds; -{ - ipftq_t *ifq; - u_int period; - - period = seconds * IPF_HZ_DIVIDE; - - MUTEX_ENTER(&ipf_timeoutlock); - for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) { - if (ifq->ifq_ttl == period) { - /* - * Reset the delete flag, if set, so the structure - * gets reused rather than freed and reallocated. - */ - MUTEX_ENTER(&ifq->ifq_lock); - ifq->ifq_flags &= ~IFQF_DELETE; - ifq->ifq_ref++; - MUTEX_EXIT(&ifq->ifq_lock); - MUTEX_EXIT(&ipf_timeoutlock); - - return ifq; - } - } - - KMALLOC(ifq, ipftq_t *); - if (ifq != NULL) { - ifq->ifq_ttl = period; - ifq->ifq_head = NULL; - ifq->ifq_tail = &ifq->ifq_head; - ifq->ifq_next = *parent; - ifq->ifq_pnext = parent; - ifq->ifq_ref = 1; - ifq->ifq_flags = IFQF_USER; - *parent = ifq; - fr_userifqs++; - MUTEX_NUKE(&ifq->ifq_lock); - MUTEX_INIT(&ifq->ifq_lock, "ipftq mutex"); - } - MUTEX_EXIT(&ipf_timeoutlock); - return ifq; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_deletetimeoutqueue */ -/* Returns: int - new reference count value of the timeout queue */ -/* Parameters: ifq(I) - timeout queue which is losing a reference. */ -/* Locks: ifq->ifq_lock */ -/* */ -/* This routine must be called when we're discarding a pointer to a timeout */ -/* queue object, taking care of the reference counter. */ -/* */ -/* Now that this just sets a DELETE flag, it requires the expire code to */ -/* check the list of user defined timeout queues and call the free function */ -/* below (currently commented out) to stop memory leaking. It is done this */ -/* way because the locking may not be sufficient to safely do a free when */ -/* this function is called. */ -/* ------------------------------------------------------------------------ */ -int fr_deletetimeoutqueue(ifq) -ipftq_t *ifq; -{ - - ifq->ifq_ref--; - if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) { - ifq->ifq_flags |= IFQF_DELETE; - } - - return ifq->ifq_ref; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_freetimeoutqueue */ -/* Parameters: ifq(I) - timeout queue which is losing a reference. */ -/* Returns: Nil */ -/* */ -/* Locking: */ -/* It is assumed that the caller of this function has an appropriate lock */ -/* held (exclusively) in the domain that encompases the callers "domain". */ -/* The ifq_lock for this structure should not be held. */ -/* */ -/* Remove a user definde timeout queue from the list of queues it is in and */ -/* tidy up after this is done. */ -/* ------------------------------------------------------------------------ */ -void fr_freetimeoutqueue(ifq) -ipftq_t *ifq; -{ - - - if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) || - ((ifq->ifq_flags & IFQF_USER) == 0)) { - printf("fr_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n", - (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl, - ifq->ifq_ref); - return; - } - - /* - * Remove from its position in the list. - */ - *ifq->ifq_pnext = ifq->ifq_next; - if (ifq->ifq_next != NULL) - ifq->ifq_next->ifq_pnext = ifq->ifq_pnext; - - MUTEX_DESTROY(&ifq->ifq_lock); - fr_userifqs--; - KFREE(ifq); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_deletequeueentry */ -/* Returns: Nil */ -/* Parameters: tqe(I) - timeout queue entry to delete */ -/* ifq(I) - timeout queue to remove entry from */ -/* */ -/* Remove a tail queue entry from its queue and make it an orphan. */ -/* fr_deletetimeoutqueue is called to make sure the reference count on the */ -/* queue is correct. We can't, however, call fr_freetimeoutqueue because */ -/* the correct lock(s) may not be held that would make it safe to do so. */ -/* ------------------------------------------------------------------------ */ -void fr_deletequeueentry(tqe) -ipftqent_t *tqe; -{ - ipftq_t *ifq; - - ifq = tqe->tqe_ifq; - if (ifq == NULL) - return; - - MUTEX_ENTER(&ifq->ifq_lock); - - if (tqe->tqe_pnext != NULL) { - *tqe->tqe_pnext = tqe->tqe_next; - if (tqe->tqe_next != NULL) - tqe->tqe_next->tqe_pnext = tqe->tqe_pnext; - else /* we must be the tail anyway */ - ifq->ifq_tail = tqe->tqe_pnext; - - tqe->tqe_pnext = NULL; - tqe->tqe_ifq = NULL; - } - - (void) fr_deletetimeoutqueue(ifq); - - MUTEX_EXIT(&ifq->ifq_lock); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_queuefront */ -/* Returns: Nil */ -/* Parameters: tqe(I) - pointer to timeout queue entry */ -/* */ -/* Move a queue entry to the front of the queue, if it isn't already there. */ -/* ------------------------------------------------------------------------ */ -void fr_queuefront(tqe) -ipftqent_t *tqe; -{ - ipftq_t *ifq; - - ifq = tqe->tqe_ifq; - if (ifq == NULL) - return; - - MUTEX_ENTER(&ifq->ifq_lock); - if (ifq->ifq_head != tqe) { - *tqe->tqe_pnext = tqe->tqe_next; - if (tqe->tqe_next) - tqe->tqe_next->tqe_pnext = tqe->tqe_pnext; - else - ifq->ifq_tail = tqe->tqe_pnext; - - tqe->tqe_next = ifq->ifq_head; - ifq->ifq_head->tqe_pnext = &tqe->tqe_next; - ifq->ifq_head = tqe; - tqe->tqe_pnext = &ifq->ifq_head; - } - MUTEX_EXIT(&ifq->ifq_lock); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_queueback */ -/* Returns: Nil */ -/* Parameters: tqe(I) - pointer to timeout queue entry */ -/* */ -/* Move a queue entry to the back of the queue, if it isn't already there. */ -/* ------------------------------------------------------------------------ */ -void fr_queueback(tqe) -ipftqent_t *tqe; -{ - ipftq_t *ifq; - - ifq = tqe->tqe_ifq; - if (ifq == NULL) - return; - tqe->tqe_die = fr_ticks + ifq->ifq_ttl; - - MUTEX_ENTER(&ifq->ifq_lock); - if (tqe->tqe_next == NULL) { /* at the end already ? */ - MUTEX_EXIT(&ifq->ifq_lock); - return; - } - - /* - * Remove from list - */ - *tqe->tqe_pnext = tqe->tqe_next; - tqe->tqe_next->tqe_pnext = tqe->tqe_pnext; - - /* - * Make it the last entry. - */ - tqe->tqe_next = NULL; - tqe->tqe_pnext = ifq->ifq_tail; - *ifq->ifq_tail = tqe; - ifq->ifq_tail = &tqe->tqe_next; - MUTEX_EXIT(&ifq->ifq_lock); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_queueappend */ -/* Returns: Nil */ -/* Parameters: tqe(I) - pointer to timeout queue entry */ -/* ifq(I) - pointer to timeout queue */ -/* parent(I) - owing object pointer */ -/* */ -/* Add a new item to this queue and put it on the very end. */ -/* ------------------------------------------------------------------------ */ -void fr_queueappend(tqe, ifq, parent) -ipftqent_t *tqe; -ipftq_t *ifq; -void *parent; -{ - - MUTEX_ENTER(&ifq->ifq_lock); - tqe->tqe_parent = parent; - tqe->tqe_pnext = ifq->ifq_tail; - *ifq->ifq_tail = tqe; - ifq->ifq_tail = &tqe->tqe_next; - tqe->tqe_next = NULL; - tqe->tqe_ifq = ifq; - tqe->tqe_die = fr_ticks + ifq->ifq_ttl; - ifq->ifq_ref++; - MUTEX_EXIT(&ifq->ifq_lock); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_movequeue */ -/* Returns: Nil */ -/* Parameters: tq(I) - pointer to timeout queue information */ -/* oifp(I) - old timeout queue entry was on */ -/* nifp(I) - new timeout queue to put entry on */ -/* */ -/* Move a queue entry from one timeout queue to another timeout queue. */ -/* If it notices that the current entry is already last and does not need */ -/* to move queue, the return. */ -/* ------------------------------------------------------------------------ */ -void fr_movequeue(tqe, oifq, nifq) -ipftqent_t *tqe; -ipftq_t *oifq, *nifq; -{ - /* - * Is the operation here going to be a no-op ? - */ - MUTEX_ENTER(&oifq->ifq_lock); - if (oifq == nifq && *oifq->ifq_tail == tqe) { - MUTEX_EXIT(&oifq->ifq_lock); - return; - } - - /* - * Remove from the old queue - */ - *tqe->tqe_pnext = tqe->tqe_next; - if (tqe->tqe_next) - tqe->tqe_next->tqe_pnext = tqe->tqe_pnext; - else - oifq->ifq_tail = tqe->tqe_pnext; - tqe->tqe_next = NULL; - - /* - * If we're moving from one queue to another, release the lock on the - * old queue and get a lock on the new queue. For user defined queues, - * if we're moving off it, call delete in case it can now be freed. - */ - if (oifq != nifq) { - tqe->tqe_ifq = NULL; - - (void) fr_deletetimeoutqueue(oifq); - - MUTEX_EXIT(&oifq->ifq_lock); - - MUTEX_ENTER(&nifq->ifq_lock); - - tqe->tqe_ifq = nifq; - nifq->ifq_ref++; - } - - /* - * Add to the bottom of the new queue - */ - tqe->tqe_die = fr_ticks + nifq->ifq_ttl; - tqe->tqe_pnext = nifq->ifq_tail; - *nifq->ifq_tail = tqe; - nifq->ifq_tail = &tqe->tqe_next; - MUTEX_EXIT(&nifq->ifq_lock); -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_updateipid */ -/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* When we are doing NAT, change the IP of every packet to represent a */ -/* single sequence of packets coming from the host, hiding any host */ -/* specific sequencing that might otherwise be revealed. If the packet is */ -/* a fragment, then store the 'new' IPid in the fragment cache and look up */ -/* the fragment cache for non-leading fragments. If a non-leading fragment */ -/* has no match in the cache, return an error. */ -/* ------------------------------------------------------------------------ */ -static INLINE int fr_updateipid(fin) -fr_info_t *fin; -{ - u_short id, ido, sums; - u_32_t sumd, sum; - ip_t *ip; - - if (fin->fin_off != 0) { - sum = fr_ipid_knownfrag(fin); - if (sum == 0xffffffff) - return -1; - sum &= 0xffff; - id = (u_short)sum; - } else { - id = fr_nextipid(fin); - if (fin->fin_off == 0 && (fin->fin_flx & FI_FRAG) != 0) - (void) fr_ipid_newfrag(fin, (u_32_t)id); - } - - ip = fin->fin_ip; - ido = ntohs(ip->ip_id); - if (id == ido) - return 0; - ip->ip_id = htons(id); - CALC_SUMD(ido, id, sumd); /* DESTRUCTIVE MACRO! id,ido change */ - sum = (~ntohs(ip->ip_sum)) & 0xffff; - sum += sumd; - sum = (sum >> 16) + (sum & 0xffff); - sum = (sum >> 16) + (sum & 0xffff); - sums = ~(u_short)sum; - ip->ip_sum = htons(sums); - return 0; -} - - -#ifdef NEED_FRGETIFNAME -/* ------------------------------------------------------------------------ */ -/* Function: fr_getifname */ -/* Returns: char * - pointer to interface name */ -/* Parameters: ifp(I) - pointer to network interface */ -/* buffer(O) - pointer to where to store interface name */ -/* */ -/* Constructs an interface name in the buffer passed. The buffer passed is */ -/* expected to be at least LIFNAMSIZ in bytes big. If buffer is passed in */ -/* as a NULL pointer then return a pointer to a static array. */ -/* ------------------------------------------------------------------------ */ -char *fr_getifname(ifp, buffer) -struct ifnet *ifp; -char *buffer; -{ - static char namebuf[LIFNAMSIZ]; -# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \ - defined(__sgi) || defined(linux) || \ - (defined(sun) && !defined(__SVR4) && !defined(__svr4__)) - int unit, space; - char temp[20]; - char *s; -# endif - - if (buffer == NULL) - buffer = namebuf; - (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ); - buffer[LIFNAMSIZ - 1] = '\0'; -# if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \ - defined(__sgi) || \ - (defined(sun) && !defined(__SVR4) && !defined(__svr4__)) - for (s = buffer; *s; s++) - ; - unit = ifp->if_unit; - space = LIFNAMSIZ - (s - buffer); - if (space > 0) { -# if defined(SNPRINTF) && defined(_KERNEL) - SNPRINTF(temp, sizeof(temp), "%d", unit); -# else - (void) sprintf(temp, "%d", unit); -# endif - (void) strncpy(s, temp, space); - } -# endif - return buffer; -} -#endif - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_ioctlswitch */ -/* Returns: int - -1 continue processing, else ioctl return value */ -/* Parameters: unit(I) - device unit opened */ -/* data(I) - pointer to ioctl data */ -/* cmd(I) - ioctl command */ -/* mode(I) - mode value */ -/* */ -/* Based on the value of unit, call the appropriate ioctl handler or return */ -/* EIO if ipfilter is not running. Also checks if write perms are req'd */ -/* for the device in order to execute the ioctl. */ -/* ------------------------------------------------------------------------ */ -int fr_ioctlswitch(unit, data, cmd, mode) -int unit, mode; -ioctlcmd_t cmd; -void *data; -{ - int error = 0; - - switch (unit) - { - case IPL_LOGIPF : - error = -1; - break; - case IPL_LOGNAT : - if (fr_running > 0) - error = fr_nat_ioctl(data, cmd, mode); - else - error = EIO; - break; - case IPL_LOGSTATE : - if (fr_running > 0) - error = fr_state_ioctl(data, cmd, mode); - else - error = EIO; - break; - case IPL_LOGAUTH : - if (fr_running > 0) { - if ((cmd == (ioctlcmd_t)SIOCADAFR) || - (cmd == (ioctlcmd_t)SIOCRMAFR)) { - if (!(mode & FWRITE)) { - error = EPERM; - } else { - error = frrequest(unit, cmd, data, - fr_active, 1); - } - } else { - error = fr_auth_ioctl(data, cmd, mode); - } - } else - error = EIO; - break; - case IPL_LOGSYNC : -#ifdef IPFILTER_SYNC - if (fr_running > 0) - error = fr_sync_ioctl(data, cmd, mode); - else -#endif - error = EIO; - break; - case IPL_LOGSCAN : -#ifdef IPFILTER_SCAN - if (fr_running > 0) - error = fr_scan_ioctl(data, cmd, mode); - else -#endif - error = EIO; - break; - case IPL_LOGLOOKUP : -#ifdef IPFILTER_LOOKUP - if (fr_running > 0) - error = ip_lookup_ioctl(data, cmd, mode); - else -#endif - error = EIO; - break; - default : - error = EIO; - break; - } - - return error; -} - - -/* - * This array defines the expected size of objects coming into the kernel - * for the various recognised object types. - */ -#define NUM_OBJ_TYPES 14 - -static int fr_objbytes[NUM_OBJ_TYPES][2] = { - { 1, sizeof(struct frentry) }, /* frentry */ - { 0, sizeof(struct friostat) }, - { 0, sizeof(struct fr_info) }, - { 0, sizeof(struct fr_authstat) }, - { 0, sizeof(struct ipfrstat) }, - { 0, sizeof(struct ipnat) }, - { 0, sizeof(struct natstat) }, - { 0, sizeof(struct ipstate_save) }, - { 1, sizeof(struct nat_save) }, /* nat_save */ - { 0, sizeof(struct natlookup) }, - { 1, sizeof(struct ipstate) }, /* ipstate */ - { 0, sizeof(struct ips_stat) }, - { 0, sizeof(struct frauth) }, - { 0, sizeof(struct ipftune) } -}; - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_inobj */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: data(I) - pointer to ioctl data */ -/* ptr(I) - pointer to store real data in */ -/* type(I) - type of structure being moved */ -/* */ -/* Copy in the contents of what the ipfobj_t points to. In future, we */ -/* add things to check for version numbers, sizes, etc, to make it backward */ -/* compatible at the ABI for user land. */ -/* ------------------------------------------------------------------------ */ -int fr_inobj(data, ptr, type) -void *data; -void *ptr; -int type; -{ - ipfobj_t obj; - int error = 0; - - if ((type < 0) || (type > NUM_OBJ_TYPES-1)) - return EINVAL; - - BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj)); - - if (obj.ipfo_type != type) - return EINVAL; - -#ifndef IPFILTER_COMPAT - if ((fr_objbytes[type][0] & 1) != 0) { - if (obj.ipfo_size < fr_objbytes[type][1]) - return EINVAL; - } else if (obj.ipfo_size != fr_objbytes[type][1]) - return EINVAL; -#else - if (obj.ipfo_rev != IPFILTER_VERSION) - /* XXX compatibility hook here */ - ; - if ((fr_objbytes[type][0] & 1) != 0) { - if (obj.ipfo_size < fr_objbytes[type][1]) - /* XXX compatibility hook here */ - return EINVAL; - } else if (obj.ipfo_size != fr_objbytes[type][1]) - /* XXX compatibility hook here */ - return EINVAL; -#endif - - if ((fr_objbytes[type][0] & 1) != 0) { - error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr, - fr_objbytes[type][1]); - } else { - error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr, - obj.ipfo_size); - } - return error; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_inobjsz */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: data(I) - pointer to ioctl data */ -/* ptr(I) - pointer to store real data in */ -/* type(I) - type of structure being moved */ -/* sz(I) - size of data to copy */ -/* */ -/* As per fr_inobj, except the size of the object to copy in is passed in */ -/* but it must not be smaller than the size defined for the type and the */ -/* type must allow for varied sized objects. The extra requirement here is */ -/* that sz must match the size of the object being passed in - this is not */ -/* not possible nor required in fr_inobj(). */ -/* ------------------------------------------------------------------------ */ -int fr_inobjsz(data, ptr, type, sz) -void *data; -void *ptr; -int type, sz; -{ - ipfobj_t obj; - int error; - - if ((type < 0) || (type > NUM_OBJ_TYPES-1)) - return EINVAL; - if (((fr_objbytes[type][0] & 1) == 0) || (sz < fr_objbytes[type][1])) - return EINVAL; - - BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj)); - - if (obj.ipfo_type != type) - return EINVAL; - -#ifndef IPFILTER_COMPAT - if (obj.ipfo_size != sz) - return EINVAL; -#else - if (obj.ipfo_rev != IPFILTER_VERSION) - /* XXX compatibility hook here */ - ; - if (obj.ipfo_size != sz) - /* XXX compatibility hook here */ - return EINVAL; -#endif - - error = COPYIN((caddr_t)obj.ipfo_ptr, (caddr_t)ptr, sz); - return error; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_outobjsz */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: data(I) - pointer to ioctl data */ -/* ptr(I) - pointer to store real data in */ -/* type(I) - type of structure being moved */ -/* sz(I) - size of data to copy */ -/* */ -/* As per fr_outobj, except the size of the object to copy out is passed in */ -/* but it must not be smaller than the size defined for the type and the */ -/* type must allow for varied sized objects. The extra requirement here is */ -/* that sz must match the size of the object being passed in - this is not */ -/* not possible nor required in fr_outobj(). */ -/* ------------------------------------------------------------------------ */ -int fr_outobjsz(data, ptr, type, sz) -void *data; -void *ptr; -int type, sz; -{ - ipfobj_t obj; - int error; - - if ((type < 0) || (type > NUM_OBJ_TYPES-1) || - ((fr_objbytes[type][0] & 1) == 0) || - (sz < fr_objbytes[type][1])) - return EINVAL; - - BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj)); - - if (obj.ipfo_type != type) - return EINVAL; - -#ifndef IPFILTER_COMPAT - if (obj.ipfo_size != sz) - return EINVAL; -#else - if (obj.ipfo_rev != IPFILTER_VERSION) - /* XXX compatibility hook here */ - ; - if (obj.ipfo_size != sz) - /* XXX compatibility hook here */ - return EINVAL; -#endif - - error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, sz); - return error; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_outobj */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: data(I) - pointer to ioctl data */ -/* ptr(I) - pointer to store real data in */ -/* type(I) - type of structure being moved */ -/* */ -/* Copy out the contents of what ptr is to where ipfobj points to. In */ -/* future, we add things to check for version numbers, sizes, etc, to make */ -/* it backward compatible at the ABI for user land. */ -/* ------------------------------------------------------------------------ */ -int fr_outobj(data, ptr, type) -void *data; -void *ptr; -int type; -{ - ipfobj_t obj; - int error; - - if ((type < 0) || (type > NUM_OBJ_TYPES-1)) - return EINVAL; - - BCOPYIN((caddr_t)data, (caddr_t)&obj, sizeof(obj)); - - if (obj.ipfo_type != type) - return EINVAL; - -#ifndef IPFILTER_COMPAT - if ((fr_objbytes[type][0] & 1) != 0) { - if (obj.ipfo_size < fr_objbytes[type][1]) - return EINVAL; - } else if (obj.ipfo_size != fr_objbytes[type][1]) - return EINVAL; -#else - if (obj.ipfo_rev != IPFILTER_VERSION) - /* XXX compatibility hook here */ - ; - if ((fr_objbytes[type][0] & 1) != 0) { - if (obj.ipfo_size < fr_objbytes[type][1]) - /* XXX compatibility hook here */ - return EINVAL; - } else if (obj.ipfo_size != fr_objbytes[type][1]) - /* XXX compatibility hook here */ - return EINVAL; -#endif - - error = COPYOUT((caddr_t)ptr, (caddr_t)obj.ipfo_ptr, obj.ipfo_size); - return error; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_checkl4sum */ -/* Returns: int - 0 = good, -1 = bad, 1 = cannot check */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* If possible, calculate the layer 4 checksum for the packet. If this is */ -/* not possible, return without indicating a failure or success but in a */ -/* way that is ditinguishable. */ -/* ------------------------------------------------------------------------ */ -int fr_checkl4sum(fin) -fr_info_t *fin; -{ - u_short sum, hdrsum, *csump; - udphdr_t *udp; - int dosum; - - if ((fin->fin_flx & FI_NOCKSUM) != 0) - return 0; - - /* - * If the TCP packet isn't a fragment, isn't too short and otherwise - * isn't already considered "bad", then validate the checksum. If - * this check fails then considered the packet to be "bad". - */ - if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0) - return 1; - - csump = NULL; - hdrsum = 0; - dosum = 0; - sum = 0; - -#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID) - if (dohwcksum && ((*fin->fin_mp)->b_ick_flag == ICK_VALID)) { - hdrsum = 0; - sum = 0; - } else { -#endif - switch (fin->fin_p) - { - case IPPROTO_TCP : - csump = &((tcphdr_t *)fin->fin_dp)->th_sum; - dosum = 1; - break; - - case IPPROTO_UDP : - udp = fin->fin_dp; - if (udp->uh_sum != 0) { - csump = &udp->uh_sum; - dosum = 1; - } - break; - - case IPPROTO_ICMP : - csump = &((struct icmp *)fin->fin_dp)->icmp_cksum; - dosum = 1; - break; - - default : - return 1; - /*NOTREACHED*/ - } - - if (csump != NULL) - hdrsum = *csump; - - if (dosum) - sum = fr_cksum(fin->fin_m, fin->fin_ip, - fin->fin_p, fin->fin_dp); -#if SOLARIS && defined(_KERNEL) && (SOLARIS2 >= 6) && defined(ICK_VALID) - } -#endif -#if !defined(_KERNEL) - if (sum == hdrsum) { - FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum)); - } else { - FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum)); - } -#endif - if (hdrsum == sum) - return 0; - return -1; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_ifpfillv4addr */ -/* Returns: int - 0 = address update, -1 = address not updated */ -/* Parameters: atype(I) - type of network address update to perform */ -/* sin(I) - pointer to source of address information */ -/* mask(I) - pointer to source of netmask information */ -/* inp(I) - pointer to destination address store */ -/* inpmask(I) - pointer to destination netmask store */ -/* */ -/* Given a type of network address update (atype) to perform, copy */ -/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */ -/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */ -/* which case the operation fails. For all values of atype other than */ -/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */ -/* value. */ -/* ------------------------------------------------------------------------ */ -int fr_ifpfillv4addr(atype, sin, mask, inp, inpmask) -int atype; -struct sockaddr_in *sin, *mask; -struct in_addr *inp, *inpmask; -{ - if (inpmask != NULL && atype != FRI_NETMASKED) - inpmask->s_addr = 0xffffffff; - - if (atype == FRI_NETWORK || atype == FRI_NETMASKED) { - if (atype == FRI_NETMASKED) { - if (inpmask == NULL) - return -1; - inpmask->s_addr = mask->sin_addr.s_addr; - } - inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr; - } else { - inp->s_addr = sin->sin_addr.s_addr; - } - return 0; -} - - -#ifdef USE_INET6 -/* ------------------------------------------------------------------------ */ -/* Function: fr_ifpfillv6addr */ -/* Returns: int - 0 = address update, -1 = address not updated */ -/* Parameters: atype(I) - type of network address update to perform */ -/* sin(I) - pointer to source of address information */ -/* mask(I) - pointer to source of netmask information */ -/* inp(I) - pointer to destination address store */ -/* inpmask(I) - pointer to destination netmask store */ -/* */ -/* Given a type of network address update (atype) to perform, copy */ -/* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */ -/* netmask update is performed unless FRI_NETMASKED is passed as atype, in */ -/* which case the operation fails. For all values of atype other than */ -/* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */ -/* value. */ -/* ------------------------------------------------------------------------ */ -int fr_ifpfillv6addr(atype, sin, mask, inp, inpmask) -int atype; -struct sockaddr_in6 *sin, *mask; -struct in_addr *inp, *inpmask; -{ - i6addr_t *src, *dst, *and, *dmask; - - src = (i6addr_t *)&sin->sin6_addr; - and = (i6addr_t *)&mask->sin6_addr; - dst = (i6addr_t *)inp; - dmask = (i6addr_t *)inpmask; - - if (inpmask != NULL && atype != FRI_NETMASKED) { - dmask->i6[0] = 0xffffffff; - dmask->i6[1] = 0xffffffff; - dmask->i6[2] = 0xffffffff; - dmask->i6[3] = 0xffffffff; - } - - if (atype == FRI_NETWORK || atype == FRI_NETMASKED) { - if (atype == FRI_NETMASKED) { - if (inpmask == NULL) - return -1; - dmask->i6[0] = and->i6[0]; - dmask->i6[1] = and->i6[1]; - dmask->i6[2] = and->i6[2]; - dmask->i6[3] = and->i6[3]; - } - - dst->i6[0] = src->i6[0] & and->i6[0]; - dst->i6[1] = src->i6[1] & and->i6[1]; - dst->i6[2] = src->i6[2] & and->i6[2]; - dst->i6[3] = src->i6[3] & and->i6[3]; - } else { - dst->i6[0] = src->i6[0]; - dst->i6[1] = src->i6[1]; - dst->i6[2] = src->i6[2]; - dst->i6[3] = src->i6[3]; - } - return 0; -} -#endif - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_matchtag */ -/* Returns: 0 == mismatch, 1 == match. */ -/* Parameters: tag1(I) - pointer to first tag to compare */ -/* tag2(I) - pointer to second tag to compare */ -/* */ -/* Returns true (non-zero) or false(0) if the two tag structures can be */ -/* considered to be a match or not match, respectively. The tag is 16 */ -/* bytes long (16 characters) but that is overlayed with 4 32bit ints so */ -/* compare the ints instead, for speed. tag1 is the master of the */ -/* comparison. This function should only be called with both tag1 and tag2 */ -/* as non-NULL pointers. */ -/* ------------------------------------------------------------------------ */ -int fr_matchtag(tag1, tag2) -ipftag_t *tag1, *tag2; -{ - if (tag1 == tag2) - return 1; - - if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0)) - return 1; - - if ((tag1->ipt_num[0] == tag2->ipt_num[0]) && - (tag1->ipt_num[1] == tag2->ipt_num[1]) && - (tag1->ipt_num[2] == tag2->ipt_num[2]) && - (tag1->ipt_num[3] == tag2->ipt_num[3])) - return 1; - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_coalesce */ -/* Returns: 1 == success, -1 == failure, 0 == no change */ -/* Parameters: fin(I) - pointer to packet information */ -/* */ -/* Attempt to get all of the packet data into a single, contiguous buffer. */ -/* If this call returns a failure then the buffers have also been freed. */ -/* ------------------------------------------------------------------------ */ -int fr_coalesce(fin) -fr_info_t *fin; -{ - if ((fin->fin_flx & FI_COALESCE) != 0) - return 1; - - /* - * If the mbuf pointers indicate that there is no mbuf to work with, - * return but do not indicate success or failure. - */ - if (fin->fin_m == NULL || fin->fin_mp == NULL) - return 0; - -#if defined(_KERNEL) - if (fr_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) { - ATOMIC_INCL(fr_badcoalesces[fin->fin_out]); -# ifdef MENTAT - FREE_MB_T(*fin->fin_mp); -# endif - *fin->fin_mp = NULL; - fin->fin_m = NULL; - return -1; - } -#else - fin = fin; /* LINT */ -#endif - return 1; -} - - -/* - * The following table lists all of the tunable variables that can be - * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt. The format of each row - * in the table below is as follows: - * - * pointer to value, name of value, minimum, maximum, size of the value's - * container, value attribute flags - * - * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED - * means the value can only be written to when IPFilter is loaded but disabled. - * The obvious implication is if neither of these are set then the value can be - * changed at any time without harm. - */ -ipftuneable_t ipf_tuneables[] = { - /* filtering */ - { { &fr_flags }, "fr_flags", 0, 0xffffffff, - sizeof(fr_flags), 0 }, - { { &fr_active }, "fr_active", 0, 0, - sizeof(fr_active), IPFT_RDONLY }, - { { &fr_control_forwarding }, "fr_control_forwarding", 0, 1, - sizeof(fr_control_forwarding), 0 }, - { { &fr_update_ipid }, "fr_update_ipid", 0, 1, - sizeof(fr_update_ipid), 0 }, - { { &fr_chksrc }, "fr_chksrc", 0, 1, - sizeof(fr_chksrc), 0 }, - { { &fr_pass }, "fr_pass", 0, 0xffffffff, - sizeof(fr_pass), 0 }, - /* state */ - { { &fr_tcpidletimeout }, "fr_tcpidletimeout", 1, 0x7fffffff, - sizeof(fr_tcpidletimeout), IPFT_WRDISABLED }, - { { &fr_tcpclosewait }, "fr_tcpclosewait", 1, 0x7fffffff, - sizeof(fr_tcpclosewait), IPFT_WRDISABLED }, - { { &fr_tcplastack }, "fr_tcplastack", 1, 0x7fffffff, - sizeof(fr_tcplastack), IPFT_WRDISABLED }, - { { &fr_tcptimeout }, "fr_tcptimeout", 1, 0x7fffffff, - sizeof(fr_tcptimeout), IPFT_WRDISABLED }, - { { &fr_tcpclosed }, "fr_tcpclosed", 1, 0x7fffffff, - sizeof(fr_tcpclosed), IPFT_WRDISABLED }, - { { &fr_tcphalfclosed }, "fr_tcphalfclosed", 1, 0x7fffffff, - sizeof(fr_tcphalfclosed), IPFT_WRDISABLED }, - { { &fr_udptimeout }, "fr_udptimeout", 1, 0x7fffffff, - sizeof(fr_udptimeout), IPFT_WRDISABLED }, - { { &fr_udpacktimeout }, "fr_udpacktimeout", 1, 0x7fffffff, - sizeof(fr_udpacktimeout), IPFT_WRDISABLED }, - { { &fr_icmptimeout }, "fr_icmptimeout", 1, 0x7fffffff, - sizeof(fr_icmptimeout), IPFT_WRDISABLED }, - { { &fr_icmpacktimeout }, "fr_icmpacktimeout", 1, 0x7fffffff, - sizeof(fr_icmpacktimeout), IPFT_WRDISABLED }, - { { &fr_iptimeout }, "fr_iptimeout", 1, 0x7fffffff, - sizeof(fr_iptimeout), IPFT_WRDISABLED }, - { { &fr_statemax }, "fr_statemax", 1, 0x7fffffff, - sizeof(fr_statemax), 0 }, - { { &fr_statesize }, "fr_statesize", 1, 0x7fffffff, - sizeof(fr_statesize), IPFT_WRDISABLED }, - { { &fr_state_lock }, "fr_state_lock", 0, 1, - sizeof(fr_state_lock), IPFT_RDONLY }, - { { &fr_state_maxbucket }, "fr_state_maxbucket", 1, 0x7fffffff, - sizeof(fr_state_maxbucket), IPFT_WRDISABLED }, - { { &fr_state_maxbucket_reset }, "fr_state_maxbucket_reset", 0, 1, - sizeof(fr_state_maxbucket_reset), IPFT_WRDISABLED }, - { { &ipstate_logging }, "ipstate_logging", 0, 1, - sizeof(ipstate_logging), 0 }, - /* nat */ - { { &fr_nat_lock }, "fr_nat_lock", 0, 1, - sizeof(fr_nat_lock), IPFT_RDONLY }, - { { &ipf_nattable_sz }, "ipf_nattable_sz", 1, 0x7fffffff, - sizeof(ipf_nattable_sz), IPFT_WRDISABLED }, - { { &ipf_nattable_max }, "ipf_nattable_max", 1, 0x7fffffff, - sizeof(ipf_nattable_max), 0 }, - { { &ipf_natrules_sz }, "ipf_natrules_sz", 1, 0x7fffffff, - sizeof(ipf_natrules_sz), IPFT_WRDISABLED }, - { { &ipf_rdrrules_sz }, "ipf_rdrrules_sz", 1, 0x7fffffff, - sizeof(ipf_rdrrules_sz), IPFT_WRDISABLED }, - { { &ipf_hostmap_sz }, "ipf_hostmap_sz", 1, 0x7fffffff, - sizeof(ipf_hostmap_sz), IPFT_WRDISABLED }, - { { &fr_nat_maxbucket }, "fr_nat_maxbucket", 1, 0x7fffffff, - sizeof(fr_nat_maxbucket), IPFT_WRDISABLED }, - { { &fr_nat_maxbucket_reset }, "fr_nat_maxbucket_reset", 0, 1, - sizeof(fr_nat_maxbucket_reset), IPFT_WRDISABLED }, - { { &nat_logging }, "nat_logging", 0, 1, - sizeof(nat_logging), 0 }, - { { &fr_defnatage }, "fr_defnatage", 1, 0x7fffffff, - sizeof(fr_defnatage), IPFT_WRDISABLED }, - { { &fr_defnatipage }, "fr_defnatipage", 1, 0x7fffffff, - sizeof(fr_defnatipage), IPFT_WRDISABLED }, - { { &fr_defnaticmpage }, "fr_defnaticmpage", 1, 0x7fffffff, - sizeof(fr_defnaticmpage), IPFT_WRDISABLED }, - /* frag */ - { { &ipfr_size }, "ipfr_size", 1, 0x7fffffff, - sizeof(ipfr_size), IPFT_WRDISABLED }, - { { &fr_ipfrttl }, "fr_ipfrttl", 1, 0x7fffffff, - sizeof(fr_ipfrttl), IPFT_WRDISABLED }, -#ifdef IPFILTER_LOG - /* log */ - { { &ipl_suppress }, "ipl_suppress", 0, 1, - sizeof(ipl_suppress), 0 }, - { { &ipl_buffer_sz }, "ipl_buffer_sz", 0, 0, - sizeof(ipl_buffer_sz), IPFT_RDONLY }, - { { &ipl_logmax }, "ipl_logmax", 0, 0x7fffffff, - sizeof(ipl_logmax), IPFT_WRDISABLED }, - { { &ipl_logall }, "ipl_logall", 0, 1, - sizeof(ipl_logall), 0 }, - { { &ipl_logsize }, "ipl_logsize", 0, 0x80000, - sizeof(ipl_logsize), 0 }, -#endif - { { NULL }, NULL, 0, 0 } -}; - -static ipftuneable_t *ipf_tunelist = NULL; - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_findtunebycookie */ -/* Returns: NULL = search failed, else pointer to tune struct */ -/* Parameters: cookie(I) - cookie value to search for amongst tuneables */ -/* next(O) - pointer to place to store the cookie for the */ -/* "next" tuneable, if it is desired. */ -/* */ -/* This function is used to walk through all of the existing tunables with */ -/* successive calls. It searches the known tunables for the one which has */ -/* a matching value for "cookie" - ie its address. When returning a match, */ -/* the next one to be found may be returned inside next. */ -/* ------------------------------------------------------------------------ */ -static ipftuneable_t *fr_findtunebycookie(cookie, next) -void *cookie, **next; -{ - ipftuneable_t *ta, **tap; - - for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++) - if (ta == cookie) { - if (next != NULL) { - /* - * If the next entry in the array has a name - * present, then return a pointer to it for - * where to go next, else return a pointer to - * the dynaminc list as a key to search there - * next. This facilitates a weak linking of - * the two "lists" together. - */ - if ((ta + 1)->ipft_name != NULL) - *next = ta + 1; - else - *next = &ipf_tunelist; - } - return ta; - } - - for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next) - if (tap == cookie) { - if (next != NULL) - *next = &ta->ipft_next; - return ta; - } - - if (next != NULL) - *next = NULL; - return NULL; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_findtunebyname */ -/* Returns: NULL = search failed, else pointer to tune struct */ -/* Parameters: name(I) - name of the tuneable entry to find. */ -/* */ -/* Search the static array of tuneables and the list of dynamic tuneables */ -/* for an entry with a matching name. If we can find one, return a pointer */ -/* to the matching structure. */ -/* ------------------------------------------------------------------------ */ -static ipftuneable_t *fr_findtunebyname(name) -char *name; -{ - ipftuneable_t *ta; - - for (ta = ipf_tuneables; ta->ipft_name != NULL; ta++) - if (!strcmp(ta->ipft_name, name)) { - return ta; - } - - for (ta = ipf_tunelist; ta != NULL; ta = ta->ipft_next) - if (!strcmp(ta->ipft_name, name)) { - return ta; - } - - return NULL; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_addipftune */ -/* Returns: int - 0 == success, else failure */ -/* Parameters: newtune - pointer to new tune struct to add to tuneables */ -/* */ -/* Appends the tune structure pointer to by "newtune" to the end of the */ -/* current list of "dynamic" tuneable parameters. Once added, the owner */ -/* of the object is not expected to ever change "ipft_next". */ -/* ------------------------------------------------------------------------ */ -int fr_addipftune(newtune) -ipftuneable_t *newtune; -{ - ipftuneable_t *ta, **tap; - - ta = fr_findtunebyname(newtune->ipft_name); - if (ta != NULL) - return EEXIST; - - for (tap = &ipf_tunelist; *tap != NULL; tap = &(*tap)->ipft_next) - ; - - newtune->ipft_next = NULL; - *tap = newtune; - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_delipftune */ -/* Returns: int - 0 == success, else failure */ -/* Parameters: oldtune - pointer to tune struct to remove from the list of */ -/* current dynamic tuneables */ -/* */ -/* Search for the tune structure, by pointer, in the list of those that are */ -/* dynamically added at run time. If found, adjust the list so that this */ -/* structure is no longer part of it. */ -/* ------------------------------------------------------------------------ */ -int fr_delipftune(oldtune) -ipftuneable_t *oldtune; -{ - ipftuneable_t *ta, **tap; - - for (tap = &ipf_tunelist; (ta = *tap) != NULL; tap = &ta->ipft_next) - if (ta == oldtune) { - *tap = oldtune->ipft_next; - oldtune->ipft_next = NULL; - return 0; - } - - return ESRCH; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_ipftune */ -/* Returns: int - 0 == success, else failure */ -/* Parameters: cmd(I) - ioctl command number */ -/* data(I) - pointer to ioctl data structure */ -/* */ -/* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET. These */ -/* three ioctls provide the means to access and control global variables */ -/* within IPFilter, allowing (for example) timeouts and table sizes to be */ -/* changed without rebooting, reloading or recompiling. The initialisation */ -/* and 'destruction' routines of the various components of ipfilter are all */ -/* each responsible for handling their own values being too big. */ -/* ------------------------------------------------------------------------ */ -int fr_ipftune(cmd, data) -ioctlcmd_t cmd; -void *data; -{ - ipftuneable_t *ta; - ipftune_t tu; - void *cookie; - int error; - - error = fr_inobj(data, &tu, IPFOBJ_TUNEABLE); - if (error != 0) - return error; - - tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0'; - cookie = tu.ipft_cookie; - ta = NULL; - - switch (cmd) - { - case SIOCIPFGETNEXT : - /* - * If cookie is non-NULL, assume it to be a pointer to the last - * entry we looked at, so find it (if possible) and return a - * pointer to the next one after it. The last entry in the - * the table is a NULL entry, so when we get to it, set cookie - * to NULL and return that, indicating end of list, erstwhile - * if we come in with cookie set to NULL, we are starting anew - * at the front of the list. - */ - if (cookie != NULL) { - ta = fr_findtunebycookie(cookie, &tu.ipft_cookie); - } else { - ta = ipf_tuneables; - tu.ipft_cookie = ta + 1; - } - if (ta != NULL) { - /* - * Entry found, but does the data pointed to by that - * row fit in what we can return? - */ - if (ta->ipft_sz > sizeof(tu.ipft_un)) - return EINVAL; - - tu.ipft_vlong = 0; - if (ta->ipft_sz == sizeof(u_long)) - tu.ipft_vlong = *ta->ipft_plong; - else if (ta->ipft_sz == sizeof(u_int)) - tu.ipft_vint = *ta->ipft_pint; - else if (ta->ipft_sz == sizeof(u_short)) - tu.ipft_vshort = *ta->ipft_pshort; - else if (ta->ipft_sz == sizeof(u_char)) - tu.ipft_vchar = *ta->ipft_pchar; - - tu.ipft_sz = ta->ipft_sz; - tu.ipft_min = ta->ipft_min; - tu.ipft_max = ta->ipft_max; - tu.ipft_flags = ta->ipft_flags; - bcopy(ta->ipft_name, tu.ipft_name, - MIN(sizeof(tu.ipft_name), - strlen(ta->ipft_name) + 1)); - } - error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE); - break; - - case SIOCIPFGET : - case SIOCIPFSET : - /* - * Search by name or by cookie value for a particular entry - * in the tuning paramter table. - */ - error = ESRCH; - if (cookie != NULL) { - ta = fr_findtunebycookie(cookie, NULL); - if (ta != NULL) - error = 0; - } else if (tu.ipft_name[0] != '\0') { - ta = fr_findtunebyname(tu.ipft_name); - if (ta != NULL) - error = 0; - } - if (error != 0) - break; - - if (cmd == (ioctlcmd_t)SIOCIPFGET) { - /* - * Fetch the tuning parameters for a particular value - */ - tu.ipft_vlong = 0; - if (ta->ipft_sz == sizeof(u_long)) - tu.ipft_vlong = *ta->ipft_plong; - else if (ta->ipft_sz == sizeof(u_int)) - tu.ipft_vint = *ta->ipft_pint; - else if (ta->ipft_sz == sizeof(u_short)) - tu.ipft_vshort = *ta->ipft_pshort; - else if (ta->ipft_sz == sizeof(u_char)) - tu.ipft_vchar = *ta->ipft_pchar; - tu.ipft_sz = ta->ipft_sz; - tu.ipft_min = ta->ipft_min; - tu.ipft_max = ta->ipft_max; - tu.ipft_flags = ta->ipft_flags; - error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE); - - } else if (cmd == (ioctlcmd_t)SIOCIPFSET) { - /* - * Set an internal parameter. The hard part here is - * getting the new value safely and correctly out of - * the kernel (given we only know its size, not type.) - */ - u_long in; - - if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) && - (fr_running > 0)) { - error = EBUSY; - break; - } - - in = tu.ipft_vlong; - if (in < ta->ipft_min || in > ta->ipft_max) { - error = EINVAL; - break; - } - - if (ta->ipft_sz == sizeof(u_long)) { - tu.ipft_vlong = *ta->ipft_plong; - *ta->ipft_plong = in; - } else if (ta->ipft_sz == sizeof(u_int)) { - tu.ipft_vint = *ta->ipft_pint; - *ta->ipft_pint = (u_int)(in & 0xffffffff); - } else if (ta->ipft_sz == sizeof(u_short)) { - tu.ipft_vshort = *ta->ipft_pshort; - *ta->ipft_pshort = (u_short)(in & 0xffff); - } else if (ta->ipft_sz == sizeof(u_char)) { - tu.ipft_vchar = *ta->ipft_pchar; - *ta->ipft_pchar = (u_char)(in & 0xff); - } - error = fr_outobj(data, &tu, IPFOBJ_TUNEABLE); - } - break; - - default : - error = EINVAL; - break; - } - - return error; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_initialise */ -/* Returns: int - 0 == success, < 0 == failure */ -/* Parameters: None. */ -/* */ -/* Call of the initialise functions for all the various subsystems inside */ -/* of IPFilter. If any of them should fail, return immeadiately a failure */ -/* BUT do not try to recover from the error here. */ -/* ------------------------------------------------------------------------ */ -int fr_initialise() -{ - int i; - -#ifdef IPFILTER_LOG - i = fr_loginit(); - if (i < 0) - return -10 + i; -#endif - i = fr_natinit(); - if (i < 0) - return -20 + i; - - i = fr_stateinit(); - if (i < 0) - return -30 + i; - - i = fr_authinit(); - if (i < 0) - return -40 + i; - - i = fr_fraginit(); - if (i < 0) - return -50 + i; - - i = appr_init(); - if (i < 0) - return -60 + i; - -#ifdef IPFILTER_SYNC - i = ipfsync_init(); - if (i < 0) - return -70 + i; -#endif -#ifdef IPFILTER_SCAN - i = ipsc_init(); - if (i < 0) - return -80 + i; -#endif -#ifdef IPFILTER_LOOKUP - i = ip_lookup_init(); - if (i < 0) - return -90 + i; -#endif -#ifdef IPFILTER_COMPILED - ipfrule_add(); -#endif - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_deinitialise */ -/* Returns: None. */ -/* Parameters: None. */ -/* */ -/* Call all the various subsystem cleanup routines to deallocate memory or */ -/* destroy locks or whatever they've done that they need to now undo. */ -/* The order here IS important as there are some cross references of */ -/* internal data structures. */ -/* ------------------------------------------------------------------------ */ -void fr_deinitialise() -{ - fr_fragunload(); - fr_authunload(); - fr_natunload(); - fr_stateunload(); -#ifdef IPFILTER_SCAN - fr_scanunload(); -#endif - appr_unload(); - -#ifdef IPFILTER_COMPILED - ipfrule_remove(); -#endif - - (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); - (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); - (void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); - (void) frflush(IPL_LOGCOUNT, 0, FR_INQUE|FR_OUTQUE); - -#ifdef IPFILTER_LOOKUP - ip_lookup_unload(); -#endif - -#ifdef IPFILTER_LOG - fr_logunload(); -#endif -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_zerostats */ -/* Returns: int - 0 = success, else failure */ -/* Parameters: data(O) - pointer to pointer for copying data back to */ -/* */ -/* Copies the current statistics out to userspace and then zero's the */ -/* current ones in the kernel. The lock is only held across the bzero() as */ -/* the copyout may result in paging (ie network activity.) */ -/* ------------------------------------------------------------------------ */ -int fr_zerostats(data) -caddr_t data; -{ - friostat_t fio; - int error; - - fr_getstat(&fio); - error = copyoutptr(&fio, data, sizeof(fio)); - if (error) - return EFAULT; - - WRITE_ENTER(&ipf_mutex); - bzero((char *)frstats, sizeof(*frstats) * 2); - RWLOCK_EXIT(&ipf_mutex); - - return 0; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_resolvedest */ -/* Returns: Nil */ -/* Parameters: fdp(IO) - pointer to destination information to resolve */ -/* v(I) - IP protocol version to match */ -/* */ -/* Looks up an interface name in the frdest structure pointed to by fdp and */ -/* if a matching name can be found for the particular IP protocol version */ -/* then store the interface pointer in the frdest struct. If no match is */ -/* found, then set the interface pointer to be -1 as NULL is considered to */ -/* indicate there is no information at all in the structure. */ -/* ------------------------------------------------------------------------ */ -void fr_resolvedest(fdp, v) -frdest_t *fdp; -int v; -{ - void *ifp; - - ifp = NULL; - v = v; /* LINT */ - - if (*fdp->fd_ifname != '\0') { - ifp = GETIFP(fdp->fd_ifname, v); - if (ifp == NULL) - ifp = (void *)-1; - } - fdp->fd_ifp = ifp; -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_icmp4errortype */ -/* Returns: int - 1 == success, 0 == failure */ -/* Parameters: icmptype(I) - ICMP type number */ -/* */ -/* Tests to see if the ICMP type number passed is an error type or not. */ -/* ------------------------------------------------------------------------ */ -int fr_icmp4errortype(icmptype) -int icmptype; -{ - - switch (icmptype) - { - case ICMP_SOURCEQUENCH : - case ICMP_PARAMPROB : - case ICMP_REDIRECT : - case ICMP_TIMXCEED : - case ICMP_UNREACH : - return 1; - default: - return 0; - } -} - - -/* ------------------------------------------------------------------------ */ -/* Function: fr_resolvenic */ -/* Returns: void* - NULL = wildcard name, -1 = failed to find NIC, else */ -/* pointer to interface structure for NIC */ -/* Parameters: name(I) - complete interface name */ -/* v(I) - IP protocol version */ -/* */ -/* Look for a network interface structure that firstly has a matching name */ -/* to that passed in and that is also being used for that IP protocol */ -/* version (necessary on some platforms where there are separate listings */ -/* for both IPv4 and IPv6 on the same physical NIC. */ -/* */ -/* One might wonder why name gets terminated with a \0 byte in here. The */ -/* reason is an interface name could get into the kernel structures of ipf */ -/* in any number of ways and so long as they all use the same sized array */ -/* to put the name in, it makes sense to ensure it gets null terminated */ -/* before it is used for its intended purpose - finding its match in the */ -/* kernel's list of configured interfaces. */ -/* */ -/* NOTE: This SHOULD ONLY be used with IPFilter structures that have an */ -/* array for the name that is LIFNAMSIZ bytes (at least) in length. */ -/* ------------------------------------------------------------------------ */ -void *fr_resolvenic(name, v) -char *name; -int v; -{ - void *nic; - - if (name[0] == '\0') - return NULL; - - if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) { - return NULL; - } - - name[LIFNAMSIZ - 1] = '\0'; - - nic = GETIFP(name, v); - if (nic == NULL) - nic = (void *)-1; - return nic; -} |
