text: /*	$NetBSD: fil.c,v 1.55.4.1 2002/10/24 09:33:49 lukem Exp $	*/
  
  /*
   * Copyright (C) 1993-2001 by Darren Reed.
   *
   * See the IPFILTER.LICENCE file for details on licencing.
   */
  #ifdef __sgi
  # include <sys/ptimers.h>
  #endif
  #include <sys/errno.h>
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/time.h>
  #include <sys/file.h>
  #if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
      defined(_KERNEL)
  # include "opt_ipfilter_log.h"
  #endif
  #if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
      (__FreeBSD_version >= 220000)
  # if (__FreeBSD_version >= 400000)
  #  ifndef KLD_MODULE
  #   include "opt_inet6.h"
  #  endif
  #  if (__FreeBSD_version == 400019)
  #   define CSUM_DELAY_DATA
  #  endif
  # endif
  # include <sys/filio.h>
  # include <sys/fcntl.h>
  #else
  # include <sys/ioctl.h>
  #endif
  #if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
  # include <sys/systm.h>
  #else
  # include <stdio.h>
  # include <string.h>
  # include <stdlib.h>
  #endif
  #if !defined(__SVR4) && !defined(__svr4__)
  # ifndef linux
  #  include <sys/mbuf.h>
  # endif
  #else
  # include <sys/byteorder.h>
  # if SOLARIS2 < 5
  #  include <sys/dditypes.h>
  # endif
  #  include <sys/stream.h>
  #endif
  #ifndef linux
  # include <sys/protosw.h>
  # include <sys/socket.h>
  #endif
  #include <net/if.h>
  #ifdef sun
  # include <net/af.h>
  #endif
  #include <net/route.h>
  #include <netinet/in.h>
  #include <netinet/in_systm.h>
  #include <netinet/ip.h>
  #ifndef linux
  # include <netinet/ip_var.h>
  #endif
  #if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
  # include <sys/hashing.h>
  # include <netinet/in_var.h>
  #endif
  #include <netinet/tcp.h>
  #include <netinet/udp.h>
  #include <netinet/ip_icmp.h>
  #include "netinet/ip_compat.h"
  #ifdef	USE_INET6
  # include <netinet/icmp6.h>
  # if !SOLARIS && defined(_KERNEL)
  #  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"
  # if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
  #  include <sys/malloc.h>
  #  if defined(_KERNEL) && !defined(IPFILTER_LKM)
  #   include "opt_ipfilter.h"
  #  endif
  # endif
  #ifndef	MIN
  # define	MIN(a,b)	(((a)<(b))?(a):(b))
  #endif
  #include "netinet/ipl.h"
  
  #if !defined(lint)
  #if defined(__NetBSD__)
  #include <sys/cdefs.h>
  __KERNEL_RCSID(0, "$NetBSD: fil.c,v 1.55.4.1 2002/10/24 09:33:49 lukem Exp $");
  #else
  static const char sccsid[] = "@(#)fil.c	1.36 6/5/96 (C) 1993-2000 Darren Reed";
  static const char rcsid[] = "@(#)Id: fil.c,v 2.35.2.63 2002/08/28 12:40:08 darrenr Exp";
  #endif
  #endif
  
  #ifndef	_KERNEL
  # include "ipf.h"
  # include "ipt.h"
  extern	int	opts;
  
  # define	FR_VERBOSE(verb_pr)			verbose verb_pr
  # define	FR_DEBUG(verb_pr)			debug verb_pr
  # define	IPLLOG(a, c, d, e)		ipflog(a, c, d, e)
  #else /* #ifndef _KERNEL */
  # define	FR_VERBOSE(verb_pr)
  # define	FR_DEBUG(verb_pr)
  # define	IPLLOG(a, c, d, e)		ipflog(a, c, d, e)
  # if SOLARIS || defined(__sgi)
  extern	KRWLOCK_T	ipf_mutex, ipf_auth, ipf_nat;
  extern	kmutex_t	ipf_rw;
  # endif /* SOLARIS || __sgi */
  #endif /* _KERNEL */
  
  
  struct	filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
  struct	frentry	*ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
  #ifdef	USE_INET6
  		*ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
  		*ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
  #endif
  		*ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
  struct	frgroup *ipfgroups[3][2];
  int	fr_flags = IPF_LOGGING;
  int	fr_active = 0;
  int	fr_chksrc = 0;
  int	fr_minttl = 3;
  int	fr_minttllog = 1;
  #if defined(IPFILTER_DEFAULT_BLOCK)
  int	fr_pass = FR_NOMATCH|FR_BLOCK;
  #else
  int	fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
  #endif
  char	ipfilter_version[] = IPL_VERSION;
  
  fr_info_t	frcache[2];
  
  static	int	frflushlist __P((int, minor_t, int *, frentry_t **));
  #ifdef	_KERNEL
  static	void	frsynclist __P((frentry_t *));
  #endif
  
  
  /*
   * bit values for identifying presence of individual IP options
   */
  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 }
  };
  
  /*
   * 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 }
  };
  
  
  /*
   * compact the IP header into a structure which contains just the info.
   * which is useful for comparing IP headers with.
   */
  void	fr_makefrip(hlen, ip, fin)
  int hlen;
  ip_t *ip;
  fr_info_t *fin;
  {
  	u_short optmsk = 0, secmsk = 0, auth = 0;
  	int i, mv, ol, off, p, plen, v;
  	fr_ip_t *fi = &fin->fin_fi;
  	const struct optlist *op;
  	u_char *s, opt;
  	tcphdr_t *tcp;
  
  	fin->fin_rev = 0;
  	fin->fin_fr = NULL;
  	fin->fin_tcpf = 0;
  	fin->fin_data[0] = 0;
  	fin->fin_data[1] = 0;
  	fin->fin_rule = -1;
  	fin->fin_group = -1;
  	fin->fin_icode = ipl_unreach;
  	v = fin->fin_v;
  	fi->fi_v = v;
  	fin->fin_hlen = hlen;
  	if (v == 4) {
  		fin->fin_id = ip->ip_id;
  		fi->fi_tos = ip->ip_tos;
  		off = (ip->ip_off & IP_OFFMASK);
  		tcp = (tcphdr_t *)((char *)ip + hlen);
  		(*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
  		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;
  		p = ip->ip_p;
  		fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
  		if (ip->ip_off & (IP_MF|IP_OFFMASK))
  			fi->fi_fl |= FI_FRAG;
  		plen = ip->ip_len;
  		fin->fin_dlen = plen - hlen;
  	}
  #ifdef	USE_INET6
  	else if (v == 6) {
  		ip6_t *ip6 = (ip6_t *)ip;
  
  		off = 0;
  		p = ip6->ip6_nxt;
  		fi->fi_p = p;
  		fi->fi_ttl = ip6->ip6_hlim;
  		tcp = (tcphdr_t *)(ip6 + 1);
  		fi->fi_src.in6 = ip6->ip6_src;
  		fi->fi_dst.in6 = ip6->ip6_dst;
  		fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
  		fi->fi_tos = 0;
  		fi->fi_fl = 0;
  		plen = ntohs(ip6->ip6_plen);
  		fin->fin_dlen = plen;
  		plen += sizeof(*ip6);
  	}
  #endif
  	else
  		return;
  
  	fin->fin_off = off;
  	fin->fin_plen = plen;
  	fin->fin_dp = (char *)tcp;
  	fin->fin_misc = 0;
  	off <<= 3;
  
  	switch (p)
  	{
  #ifdef USE_INET6
  	case IPPROTO_ICMPV6 :
  	{
  		int minicmpsz = sizeof(struct icmp6_hdr);
  		struct icmp6_hdr *icmp6;
  
  		if (fin->fin_dlen > 1) {
  			fin->fin_data[0] = *(u_short *)tcp;
  
  			icmp6 = (struct icmp6_hdr *)tcp;
  
  			switch (icmp6->icmp6_type)
  			{
  			case ICMP6_ECHO_REPLY :
  			case ICMP6_ECHO_REQUEST :
  				minicmpsz = ICMP6_MINLEN;
  				break;
  			case ICMP6_DST_UNREACH :
  			case ICMP6_PACKET_TOO_BIG :
  			case ICMP6_TIME_EXCEEDED :
  			case ICMP6_PARAM_PROB :
  				minicmpsz = ICMP6ERR_IPICMPHLEN;
  				break;
  			default :
  				break;
  			}
  		}
  
  		if (!(plen >= minicmpsz))
  			fi->fi_fl |= FI_SHORT;
  
  		break;
  	}
  #endif
  	case IPPROTO_ICMP :
  	{
  		int minicmpsz = sizeof(struct icmp);
  		icmphdr_t *icmp;
  
  		if (!off && (fin->fin_dlen > 1)) {
  			fin->fin_data[0] = *(u_short *)tcp;
  
  			icmp = (icmphdr_t *)tcp;
  
  			switch (icmp->icmp_type)
  			{
  			case ICMP_ECHOREPLY :
  			case ICMP_ECHO :
  			/* Router discovery messages - 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;
  			default :
  				break;
  			}
  		}
  
  		if ((!(plen >= hlen + minicmpsz) && !off) ||
  		    (off && off < sizeof(struct icmp)))
  			fi->fi_fl |= FI_SHORT;
  
  		break;
  	}
  	case IPPROTO_TCP :
  		fi->fi_fl |= FI_TCPUDP;
  #ifdef	USE_INET6
  		if (v == 6) {
  			if (plen < sizeof(struct tcphdr))
  				fi->fi_fl |= FI_SHORT;
  		} else
  #endif
  		if (v == 4) {
  			if ((!IPMINLEN(ip, tcphdr) && !off) ||
  			     (off && off < sizeof(struct tcphdr)))
  				fi->fi_fl |= FI_SHORT;
  		}
  		if (!(fi->fi_fl & FI_SHORT) && !off)
  			fin->fin_tcpf = tcp->th_flags;
  		goto getports;
  	case IPPROTO_UDP :
  		fi->fi_fl |= FI_TCPUDP;
  #ifdef	USE_INET6
  		if (v == 6) {
  			if (plen < sizeof(struct udphdr))
  				fi->fi_fl |= FI_SHORT;
  		} else
  #endif
  		if (v == 4) {
  			if ((!IPMINLEN(ip, udphdr) && !off) ||
  			    (off && off < sizeof(struct udphdr)))
  				fi->fi_fl |= FI_SHORT;
  		}
  getports:
  		if (!off && (fin->fin_dlen > 3)) {
  			fin->fin_data[0] = ntohs(tcp->th_sport);
  			fin->fin_data[1] = ntohs(tcp->th_dport);
  		}
  		break;
  	case IPPROTO_ESP :
  #ifdef	USE_INET6
  		if (v == 6) {
  			if (plen < 8)
  				fi->fi_fl |= FI_SHORT;
  		} else
  #endif
  		if (v == 4) {
  			if (((ip->ip_len < hlen + 8) && !off) ||
  			    (off && off < 8))
  				fi->fi_fl |= FI_SHORT;
  		}
  		break;
  	default :
  		break;
  	}
  
  #ifdef	USE_INET6
  	if (v == 6) {
  		fi->fi_optmsk = 0;
  		fi->fi_secmsk = 0;
  		fi->fi_auth = 0;
  		return;
  	}
  #endif
  
  	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) {
  				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--;
  					}
  				}
  				break;
  			}
  			if (opt < op->ol_val)
  				i -= mv--;
  			else
  				i += mv--;
  		}
  		hlen -= ol;
  		s += ol;
  	}
  	if (auth && !(auth & 0x0100))
  		auth &= 0xff00;
  	fi->fi_optmsk = optmsk;
  	fi->fi_secmsk = secmsk;
  	fi->fi_auth = auth;
  }
  
  
  /*
   * check an IP packet for TCP/UDP characteristics such as ports and flags.
   */
  int fr_tcpudpchk(ft, fin)
  frtuc_t *ft;
  fr_info_t *fin;
  {
  	register u_short po, tup;
  	register char i;
  	register int err = 1;
  
  	/*
  	 * Both ports should *always* be in the first fragment.
  	 * So far, I cannot find any cases where they can not be.
  	 *
  	 * compare destination ports
  	 */
  	if ((i = (int)ft->ftu_dcmp)) {
  		po = ft->ftu_dport;
  		tup = fin->fin_data[1];
  		/*
  		 * Do opposite test to that required and
  		 * continue if that succeeds.
  		 */
  		if (!--i && tup != po) /* EQUAL */
  			err = 0;
  		else if (!--i && tup == po) /* NOTEQUAL */
  			err = 0;
  		else if (!--i && tup >= po) /* LESSTHAN */
  			err = 0;
  		else if (!--i && tup <= po) /* GREATERTHAN */
  			err = 0;
  		else if (!--i && tup > po) /* LT or EQ */
  			err = 0;
  		else if (!--i && tup < po) /* GT or EQ */
  			err = 0;
  		else if (!--i &&	   /* Out of range */
  			 (tup >= po && tup <= ft->ftu_dtop))
  			err = 0;
  		else if (!--i &&	   /* In range */
  			 (tup <= po || tup >= ft->ftu_dtop))
  			err = 0;
  	}
  	/*
  	 * compare source ports
  	 */
  	if (err && (i = (int)ft->ftu_scmp)) {
  		po = ft->ftu_sport;
  		tup = fin->fin_data[0];
  		if (!--i && tup != po)
  			err = 0;
  		else if (!--i && tup == po)
  			err = 0;
  		else if (!--i && tup >= po)
  			err = 0;
  		else if (!--i && tup <= po)
  			err = 0;
  		else if (!--i && tup > po)
  			err = 0;
  		else if (!--i && tup < po)
  			err = 0;
  		else if (!--i &&	   /* Out of range */
  			 (tup >= po && tup <= ft->ftu_stop))
  			err = 0;
  		else if (!--i &&	   /* In range */
  			 (tup <= po || tup >= ft->ftu_stop))
  			err = 0;
  	}
  
  	/*
  	 * If we don't have all the TCP/UDP header, then how can we
  	 * expect to do any sort of match on it ?  If we were looking for
  	 * TCP flags, then NO match.  If not, then match (which should
  	 * satisfy the "short" class too).
  	 */
  	if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
  		if (fin->fin_fl & 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;
  }
  
  /*
   * Check the input/output list of rules for a match and result.
   * Could be per interface, but this gets real nasty when you don't have
   * kernel sauce.
   */
  int fr_scanlist(passin, ip, fin, m)
  u_32_t passin;
  ip_t *ip;
  register fr_info_t *fin;
  void *m;
  {
  	register struct frentry *fr;
  	register fr_ip_t *fi = &fin->fin_fi;
  	int rulen, portcmp = 0, off, skip = 0, logged = 0;
  	u_32_t pass, passt, passl;
  	frentry_t *frl;
  
  	frl = NULL;
  	pass = passin;
  	fr = fin->fin_fr;
  	fin->fin_fr = NULL;
  	off = fin->fin_off;
  
  	if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
  		portcmp = 1;
  
  	for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
  		if (skip) {
  			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	(BSD >= 199306)
  		if (fin->fin_out != 0) {
  			if ((fr->fr_oifa &&
  			     (fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif)))
  				continue;
  		}
  # endif
  #else
  		if (opts & (OPT_VERBOSE|OPT_DEBUG))
  			printf("\n");
  #endif
  
  		FR_VERBOSE(("%c", fr->fr_skip ? 's' :
  				  (pass & FR_PASS) ? 'p' : 
  				  (pass & FR_AUTH) ? 'a' :
  				  (pass & FR_ACCOUNT) ? 'A' :
  				  (pass & FR_NOMATCH) ? 'n' : 'b'));
  
  		if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
  			continue;
  
  		FR_VERBOSE((":i"));
  		{
  			register u_32_t	*ld, *lm, *lip;
  			register int i;
  
  			lip = (u_32_t *)fi;
  			lm = (u_32_t *)&fr->fr_mip;
  			ld = (u_32_t *)&fr->fr_ip;
  			i = ((*lip & *lm) != *ld);
  			FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
  				   *lip, *lm, *ld));
  			if (i)
  				continue;
  			/*
  			 * We now know whether the packet version and the
  			 * rule version match, along with protocol, ttl and
  			 * tos.
  			 */
  			lip++, lm++, ld++;
  			/*
  			 * Unrolled loops (4 each, for 32 bits).
  			 */
  			FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
  				   *lip, *lm, *ld));
  			i |= ((*lip++ & *lm++) != *ld++) << 5;
  			if (fi->fi_v == 6) {
  				FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 5;
  				FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 5;
  				FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 5;
  			} else {
  				lip += 3;
  				lm += 3;
  				ld += 3;
  			}
  			i ^= (fr->fr_flags & FR_NOTSRCIP);
  			if (i)
  				continue;
  			FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
  				   *lip, *lm, *ld));
  			i |= ((*lip++ & *lm++) != *ld++) << 6;
  			if (fi->fi_v == 6) {
  				FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 6;
  				FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 6;
  				FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
  					   *lip, *lm, *ld));
  				i |= ((*lip++ & *lm++) != *ld++) << 6;
  			} else {
  				lip += 3;
  				lm += 3;
  				ld += 3;
  			}
  			i ^= (fr->fr_flags & FR_NOTDSTIP);
  			if (i)
  				continue;
  			FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
  				   *lip, *lm, *ld));
  			i |= ((*lip++ & *lm++) != *ld++);
  			FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
  				   *lip, *lm, *ld));
  			i |= ((*lip & *lm) != *ld);
  			if (i)
  				continue;
  		}
  
  		/*
  		 * If a fragment, then only the first has what we're looking
  		 * for here...
  		 */
  		if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
  				 fr->fr_tcpfm))
  			continue;
  		if (fi->fi_fl & FI_TCPUDP) {
  			if (!fr_tcpudpchk(&fr->fr_tuc, fin))
  				continue;
  		} else if (fr->fr_icmpm || fr->fr_icmp) {
  			if ((fi->fi_p != IPPROTO_ICMP) || off ||
  			    (fin->fin_dlen < 2))
  				continue;
  			if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
  				FR_DEBUG(("i. %#x & %#x != %#x\n",
  					 fin->fin_data[0], fr->fr_icmpm,
  					 fr->fr_icmp));
  				continue;
  			}
  		}
  		FR_VERBOSE(("*"));
  
  		if (fr->fr_flags & FR_NOMATCH) {
  			passt = passl;
  			passl = passin;
  			fin->fin_fr = frl;
  			frl = NULL;
  			if (fr->fr_flags & FR_QUICK)
  				break;
  			continue;
  		}
  
  		passl = passt;
  		passt = fr->fr_flags;
  		frl = fin->fin_fr;
  		fin->fin_fr = fr;
  #if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
  		if (securelevel <= 0)
  #endif
  			if ((passt & FR_CALLNOW) && fr->fr_func)
  				passt = (*fr->fr_func)(passt, ip, fin);
  #ifdef  IPFILTER_LOG
  		/*
  		 * Just log this packet...
  		 */
  		if ((passt & FR_LOGMASK) == FR_LOG) {
  			if (!IPLLOG(passt, ip, fin, m)) {
  				if (passt & FR_LOGORBLOCK)
  					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 */
  		ATOMIC_INCL(fr->fr_hits);
  		if (passt & FR_ACCOUNT)
  			fr->fr_bytes += (U_QUAD_T)ip->ip_len;
  		else
  			fin->fin_icode = fr->fr_icode;
  		fin->fin_rule = rulen;
  		fin->fin_group = fr->fr_group;
  		if (fr->fr_grp != NULL) {
  			fin->fin_fr = fr->fr_grp;
  			passt = fr_scanlist(passt, ip, fin, m);
  			if (fin->fin_fr == NULL) {
  				fin->fin_rule = rulen;
  				fin->fin_group = fr->fr_group;
  				fin->fin_fr = fr;
  			}
  			if (passt & FR_DONTCACHE)
  				logged = 1;
  		}
  		if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
  			pass = passt;
  		FR_DEBUG(("pass %#x\n", pass));
  		if (passt & FR_QUICK)
  			break;
  	}
  	if (logged)
  		pass |= FR_DONTCACHE;
  	pass |= (fi->fi_fl << 24);
  	return pass;
  }
  
  
  /*
   * frcheck - filter check
   * check using source and destination addresses/ports in a packet whether
   * or not to pass it on or not.
   */
  int fr_check(ip, hlen, ifp, out
  #if defined(_KERNEL) && SOLARIS
  , qif, mp)
  qif_t *qif;
  #else
  , mp)
  #endif
  mb_t **mp;
  ip_t *ip;
  int hlen;
  void *ifp;
  int out;
  {
  	/*
  	 * The above really sucks, but short of writing a diff
  	 */
  	fr_info_t frinfo, *fc;
  	register fr_info_t *fin = &frinfo;
  	int changed, error = EHOSTUNREACH, v = ip->ip_v;
  	frentry_t *fr = NULL, *list;
  	u_32_t pass, apass;
  #if !SOLARIS || !defined(_KERNEL)
  	register mb_t *m = *mp;
  #endif
  
  #ifdef	_KERNEL
  	int p, len, drop = 0, logit = 0;
  	mb_t *mc = NULL;
  # if !defined(__SVR4) && !defined(__svr4__)
  #  ifdef __sgi
  	char hbuf[128];
  #  endif
  	int up;
  
  #  ifdef M_CANFASTFWD
  	/*
  	 * XXX For now, IP Filter and fast-forwarding of cached flows
  	 * XXX are mutually exclusive.  Eventually, IP Filter should
  	 * XXX get a "can-fast-forward" filter rule.
  	 */
  	m->m_flags &= ~M_CANFASTFWD;
  #  endif /* M_CANFASTFWD */
  #  ifdef CSUM_DELAY_DATA
  	/*
  	 * disable delayed checksums.
  	 */
  	if ((out != 0) && (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
  		in_delayed_cksum(m);
  		m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
  	}
  #  endif /* CSUM_DELAY_DATA */
  
  # ifdef	USE_INET6
  	if (v == 6) {
  		len = ntohs(((ip6_t*)ip)->ip6_plen);
  		if (!len)
  			return -1;	/* potential jumbo gram */
  		len += sizeof(ip6_t);
  		p = ((ip6_t *)ip)->ip6_nxt;
  	} else
  # endif
  	{
  		p = ip->ip_p;
  		len = ip->ip_len;
  	}
  
  	if ((p == IPPROTO_TCP || p == IPPROTO_UDP ||
  	    (v == 4 && p == IPPROTO_ICMP)
  # ifdef USE_INET6
  	    || (v == 6 && p == IPPROTO_ICMPV6)
  # endif
  	   )) {
  		int plen = 0;
  
  		if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
  			switch(p)
  			{
  			case IPPROTO_TCP:
  				plen = sizeof(tcphdr_t);
  				break;
  			case IPPROTO_UDP:
  				plen = sizeof(udphdr_t);
  				break;
  			/* 96 - enough for complete ICMP error IP header */
  			case IPPROTO_ICMP:
  				plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
  				break;
  			case IPPROTO_ESP:
  				plen = 8;
  				break;
  # ifdef USE_INET6
  	    		case IPPROTO_ICMPV6 :
  				/*
  				 * XXX does not take intermediate header
  				 * into account
  				 */
  				plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
  				break;
  # endif
  			}
  		up = MIN(hlen + plen, len);
  
  		if (up > m->m_len) {
  #  ifdef __sgi
  	/* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
  			if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
  				ATOMIC_INCL(frstats[out].fr_pull[1]);
  				return -1;
  			}
  			m_copydata(m, 0, up, hbuf);
  			ATOMIC_INCL(frstats[out].fr_pull[0]);
  			ip = (ip_t *)hbuf;
  #  else /* __ sgi */
  #   ifndef linux
  			if ((*mp = m_pullup(m, up)) == 0) {
  				ATOMIC_INCL(frstats[out].fr_pull[1]);
  				return -1;
  			} else {
  				ATOMIC_INCL(frstats[out].fr_pull[0]);
  				m = *mp;
  				ip = mtod(m, ip_t *);
  			}
  #   endif /* !linux */
  #  endif /* __sgi */
  		} else
  			up = 0;
  	} else
  		up = 0;
  # endif /* !defined(__SVR4) && !defined(__svr4__) */
  # if SOLARIS
  	mb_t *m = qif->qf_m;
  
  	if ((u_int)ip & 0x3)
  		return 2;
  	fin->fin_qfm = m;
  	fin->fin_qif = qif;
  # endif
  #endif /* _KERNEL */
  	
  	changed = 0;
  	fin->fin_ifp = ifp;
  	fin->fin_v = v;
  	fin->fin_out = out;
  	fin->fin_mp = mp;
  	fr_makefrip(hlen, ip, fin);
  
  #ifdef _KERNEL
  # ifdef	USE_INET6
  	if (v == 6) {
  		ATOMIC_INCL(frstats[0].fr_ipv6[out]);
  		if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
  			ATOMIC_INCL(frstats[0].fr_badttl);
  			if (fr_minttllog & 1)
  				logit = -3;
  			if (fr_minttllog & 2)
  				drop = 1;
  		}
  	} else
  # endif
  	if (!out) {
  		if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
  			ATOMIC_INCL(frstats[0].fr_badsrc);
  			if (fr_chksrc & 1)
  				drop = 1;
  			if (fr_chksrc & 2)
  				logit = -2;
  		} else if (ip->ip_ttl < fr_minttl) {
  			ATOMIC_INCL(frstats[0].fr_badttl);
  			if (fr_minttllog & 1)
  				logit = -3;
  			if (fr_minttllog & 2)
  				drop = 1;
  		}
  	}
  	if (drop) {
  # ifdef	IPFILTER_LOG
  		if (logit) {
  			fin->fin_group = logit;
  			pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
  			(void) IPLLOG(pass, ip, fin, m);
  		}
  # endif
  # if !SOLARIS
  		m_freem(m);
  # endif
  		return error;
  	}
  #endif
  	pass = fr_pass;
  	if (fin->fin_fl & 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.
  	 */
  	apass = fr_checkauth(ip, fin);
  
  	if (!out) {
  #ifdef	USE_INET6
  		if (v == 6)
  			list = ipacct6[0][fr_active];
  		else
  #endif
  			list = ipacct[0][fr_active];
  		changed = ip_natin(ip, fin);
  		if (!apass && (fin->fin_fr = list) &&
  		    (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
  			ATOMIC_INCL(frstats[0].fr_acct);
  		}
  	}
  
  	if (!apass) {
  		if ((fin->fin_fl & FI_FRAG) == FI_FRAG)
  			fr = ipfr_knownfrag(ip, fin);
  		if (!fr && !(fin->fin_fl & FI_SHORT))
  			fr = fr_checkstate(ip, fin);
  		if (fr != NULL)
  			pass = fr->fr_flags;
  		if (fr && (pass & FR_LOGFIRST))
  			pass &= ~(FR_LOGFIRST|FR_LOG);
  	}
  
  	if (apass || !fr) {
  		/*
  		 * If a packet is found in the auth table, then skip checking
  		 * the access lists for permission but we do need to consider
  		 * the result as if it were from the ACL's.
  		 */
  		if (!apass) {
  			fc = frcache + out;
  			if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
  				/*
  				 * copy cached data so we can unlock the mutex
  				 * earlier.
  				 */
  				bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
  				ATOMIC_INCL(frstats[out].fr_chit);
  				if ((fr = fin->fin_fr)) {
  					ATOMIC_INCL(fr->fr_hits);
  					pass = fr->fr_flags;
  				}
  			} else {
  #ifdef	USE_INET6
  				if (v == 6)
  					list = ipfilter6[out][fr_active];
  				else
  #endif
  					list = ipfilter[out][fr_active];
  				if ((fin->fin_fr = list))
  					pass = fr_scanlist(fr_pass, ip, fin, m);
  				if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
  					bcopy((char *)fin, (char *)fc,
  					      FI_COPYSIZE);
  				if (pass & FR_NOMATCH) {
  					ATOMIC_INCL(frstats[out].fr_nom);
  					fin->fin_fr = NULL;
  				}
  			}
  		} else
  			pass = apass;
  		fr = fin->fin_fr;
  
  		/*
  		 * If we fail to add a packet to the authorization queue,
  		 * then we drop the packet later.  However, if it was added
  		 * then pretend we've dropped it already.
  		 */
  		if ((pass & FR_AUTH)) {
  			if (fr_newauth((mb_t *)m, fin, ip) != 0) {
  				m = *mp = NULL;
  				error = 0;
  			} else
  				error = ENOSPC;
  		}
  
  		if (pass & FR_PREAUTH) {
  			READ_ENTER(&ipf_auth);
  			if ((fin->fin_fr = ipauth) &&
  			    (pass = fr_scanlist(0, ip, fin, m))) {
  				ATOMIC_INCL(fr_authstats.fas_hits);
  			} else {
  				ATOMIC_INCL(fr_authstats.fas_miss);
  			}
  			RWLOCK_EXIT(&ipf_auth);
  		}
  
  		fin->fin_fr = fr;
  		if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
  			if (fin->fin_fl & FI_FRAG) {
  				if (ipfr_newfrag(ip, fin) == -1) {
  					ATOMIC_INCL(frstats[out].fr_bnfr);
  				} else {
  					ATOMIC_INCL(frstats[out].fr_nfr);
  				}
  			} else {
  				ATOMIC_INCL(frstats[out].fr_cfr);
  			}
  		}
  		if (pass & FR_KEEPSTATE) {
  			if (fr_addstate(ip, fin, NULL, 0) == NULL) {
  				ATOMIC_INCL(frstats[out].fr_bads);
  			} else {
  				ATOMIC_INCL(frstats[out].fr_ads);
  			}
  		}
  	} else if (fr != NULL) {
  		pass = fr->fr_flags;
  		if (pass & FR_LOGFIRST)
  			pass &= ~(FR_LOGFIRST|FR_LOG);
  	}
  
  #if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
  	if (securelevel <= 0)
  #endif
  		if (fr && fr->fr_func && !(pass & FR_CALLNOW))
  			pass = (*fr->fr_func)(pass, ip, fin);
  
  	/*
  	 * Only count/translate packets which will be passed on, out the
  	 * interface.
  	 */
  	if (out && (pass & FR_PASS)) {
  #ifdef	USE_INET6
  		if (v == 6)
  			list = ipacct6[1][fr_active];
  		else
  #endif
  			list = ipacct[1][fr_active];
  		if (list != NULL) {
  			u_32_t sg, sr;
  
  			fin->fin_fr = list;
  			sg = fin->fin_group;
  			sr = fin->fin_rule;
  			if (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT) {
  				ATOMIC_INCL(frstats[1].fr_acct);
  			}
  			fin->fin_group = sg;
  			fin->fin_rule = sr;
  			fin->fin_fr = fr;
  		}
  		changed = ip_natout(ip, fin);
  	} else
  		fin->fin_fr = fr;
  	RWLOCK_EXIT(&ipf_mutex);
  
  #ifdef	IPFILTER_LOG
  	if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
  		if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
  			pass |= FF_LOGNOMATCH;
  			ATOMIC_INCL(frstats[out].fr_npkl);
  			goto logit;
  		} else if (((pass & FR_LOGMASK) == FR_LOGP) ||
  		    ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
  			if ((pass & FR_LOGMASK) != FR_LOGP)
  				pass |= FF_LOGPASS;
  			ATOMIC_INCL(frstats[out].fr_ppkl);
  			goto logit;
  		} else if (((pass & FR_LOGMASK) == FR_LOGB) ||
  			   ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
  			if ((pass & FR_LOGMASK) != FR_LOGB)
  				pass |= FF_LOGBLOCK;
  			ATOMIC_INCL(frstats[out].fr_bpkl);
  logit:
  			if (!IPLLOG(pass, ip, fin, m)) {
  				ATOMIC_INCL(frstats[out].fr_skip);
  				if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
  				    (FR_PASS|FR_LOGORBLOCK))
  					pass ^= FR_PASS|FR_BLOCK;
  			}
  		}
  	}
  #endif /* IPFILTER_LOG */
  
  #ifdef	_KERNEL
  	/*
  	 * Only allow FR_DUP to work if a rule matched - it makes no sense to
  	 * set FR_DUP as a "default" as there are no instructions about where
  	 * to send the packet.
  	 */
  	if (fr && (pass & FR_DUP))
  # if	SOLARIS
  		mc = dupmsg(m);
  # else
  #  if defined(__OpenBSD__) && (OpenBSD >= 199905)
  		mc = m_copym2(m, 0, M_COPYALL, M_DONTWAIT);
  #  else
  		mc = m_copy(m, 0, M_COPYALL);
  #  endif
  # endif
  #endif
  	if (pass & FR_PASS) {
  		ATOMIC_INCL(frstats[out].fr_pass);
  	} else if (pass & FR_BLOCK) {
  		ATOMIC_INCL(frstats[out].fr_block);
  		/*
  		 * Should we return an ICMP packet to indicate error
  		 * status passing through the packet filter ?
  		 * WARNING: ICMP error packets AND TCP RST packets should
  		 * ONLY be sent in repsonse to incoming packets.  Sending them
  		 * in response to outbound packets can result in a panic on
  		 * some operating systems.
  		 */
  		if (!out) {
  			if (changed == -1)
  				/*
  				 * If a packet results in a NAT error, do not
  				 * send a reset or ICMP error as it may disrupt
  				 * an existing flow.  This is the proxy saying
  				 * the content is bad so just drop the packet
  				 * silently.
  				 */
  				;
  			else if (pass & FR_RETICMP) {
  				int dst;
  
  				if ((pass & FR_RETMASK) == FR_FAKEICMP)
  					dst = 1;
  				else
  					dst = 0;
  				send_icmp_err(ip, ICMP_UNREACH, fin, dst);
  				ATOMIC_INCL(frstats[0].fr_ret);
  			} else if (((pass & FR_RETMASK) == FR_RETRST) &&
  				   !(fin->fin_fl & FI_SHORT)) {
  				if (send_reset(ip, fin) == 0) {
  					ATOMIC_INCL(frstats[1].fr_ret);
  				}
  			}
  		} else {
  			if (pass & FR_RETRST)
  				error = ECONNRESET;
  		}
  	}
  
  	/*
  	 * If we didn't drop off the bottom of the list of rules (and thus
  	 * the 'current' rule fr is not NULL), then we may have some extra
  	 * instructions about what to do with a packet.
  	 * Once we're finished return to our caller, freeing the packet if
  	 * we are dropping it (* BSD ONLY *).
  	 */
  	if ((changed == -1) && (pass & FR_PASS)) {
  		pass &= ~FR_PASS;
  		pass |= FR_BLOCK;
  	}
  #if defined(_KERNEL)
  # if !SOLARIS
  #  if !defined(linux)
  	if (fr) {
  		frdest_t *fdp = &fr->fr_tif;
  
  		if (((pass & FR_FASTROUTE) && !out) ||
  		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
  			(void) ipfr_fastroute(m, mp, fin, fdp);
  			m = *mp;
  		}
  
  		if (mc != NULL)
  			(void) ipfr_fastroute(mc, &mc, fin, &fr->fr_dif);
  	}
  
  	if (!(pass & FR_PASS) && m) {
  		m_freem(m);
  		m = *mp = NULL;
  	}
  #   ifdef __sgi
  	else if (changed && up && m)
  		m_copyback(m, 0, up, hbuf);
  #   endif
  #  endif /* !linux */
  # else /* !SOLARIS */
  	if (fr) {
  		frdest_t *fdp = &fr->fr_tif;
  
  		if (((pass & FR_FASTROUTE) && !out) ||
  		    (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1))
  			(void) ipfr_fastroute(ip, m, mp, fin, fdp);
  
  		if (mc != NULL)
  			(void) ipfr_fastroute(ip, mc, &mc, fin, &fr->fr_dif);
  	}
  # endif /* !SOLARIS */
  	return (pass & FR_PASS) ? 0 : error;
  #else /* _KERNEL */
  	if (pass & FR_NOMATCH)
  		return 1;
  	if (pass & FR_PASS)
  		return 0;
  	if (pass & FR_AUTH)
  		return -2;
  	if ((pass & FR_RETMASK) == FR_RETRST)
  		return -3;
  	if ((pass & FR_RETMASK) == FR_RETICMP)
  		return -4;
  	if ((pass & FR_RETMASK) == FR_FAKEICMP)
  		return -5;
  	return -1;
  #endif /* _KERNEL */
  }
  
  
  /*
   * ipf_cksum
   * addr should be 16bit aligned and len is in bytes.
   * length is in bytes
   */
  u_short ipf_cksum(addr, len)
  register u_short *addr;
  register int len;
  {
  	register u_32_t sum = 0;
  
  	for (sum = 0; len > 1; len -= 2)
  		sum += *addr++;
  
  	/* mop up an odd byte, if necessary */
  	if (len == 1)
  		sum += *(u_char *)addr;
  
  	/*
  	 * add back carry outs from top 16 bits to low 16 bits
  	 */
  	sum = (sum >> 16) + (sum & 0xffff);	/* add hi 16 to low 16 */
  	sum += (sum >> 16);			/* add carry */
  	return (u_short)(~sum);
  }
  
  
  /*
   * NB: This function assumes we've pullup'd enough for all of the IP header
   * and the TCP header.  We also assume that data blocks aren't allocated in
   * odd sizes.
   */
  u_short fr_tcpsum(m, ip, tcp)
  mb_t *m;
  ip_t *ip;
  tcphdr_t *tcp;
  {
  	u_short *sp, slen, ts;
  	u_int sum, sum2;
  	int hlen;
  
  	/*
  	 * Add up IP Header portion
  	 */
  	hlen = ip->ip_hl << 2;
  	slen = ip->ip_len - hlen;
  	sum = htons((u_short)ip->ip_p);
  	sum += htons(slen);
  	sp = (u_short *)&ip->ip_src;
  	sum += *sp++;	/* ip_src */
  	sum += *sp++;
  	sum += *sp++;	/* ip_dst */
  	sum += *sp++;
  	ts = tcp->th_sum;
  	tcp->th_sum = 0;
  #ifdef	KERNEL
  # if SOLARIS
  	sum2 = ip_cksum(m, hlen, sum);	/* hlen == offset */
  	sum2 = (sum2 & 0xffff) + (sum2 >> 16);
  	sum2 = ~sum2 & 0xffff;
  # else /* SOLARIS */
  #  if defined(BSD) || defined(sun)
  #   if BSD >= 199306
  	m->m_data += hlen;
  #   else
  	m->m_off += hlen;
  #   endif
  	m->m_len -= hlen;
  	sum2 = in_cksum(m, slen);
  	m->m_len += hlen;
  #   if BSD >= 199306
  	m->m_data -= hlen;
  #   else
  	m->m_off -= hlen;
  #   endif
  	/*
  	 * Both sum and sum2 are partial sums, so combine them together.
  	 */
  	sum = (sum & 0xffff) + (sum >> 16);
  	sum = ~sum & 0xffff;
  	sum2 += sum;
  	sum2 = (sum2 & 0xffff) + (sum2 >> 16);
  #  else /* defined(BSD) || defined(sun) */
  {
  	union {
  		u_char	c[2];
  		u_short	s;
  	} bytes;
  	u_short len = ip->ip_len;
  # if defined(__sgi)
  	int add;
  # endif
  
  	/*
  	 * Add up IP Header portion
  	 */
  	sp = (u_short *)&ip->ip_src;
  	len -= (ip->ip_hl << 2);
  	sum = ntohs(IPPROTO_TCP);
  	sum += htons(len);
  	sum += *sp++;	/* ip_src */
  	sum += *sp++;
  	sum += *sp++;	/* ip_dst */
  	sum += *sp++;
  	if (sp != (u_short *)tcp)
  		sp = (u_short *)tcp;
  	sum += *sp++;	/* sport */
  	sum += *sp++;	/* dport */
  	sum += *sp++;	/* seq */
  	sum += *sp++;
  	sum += *sp++;	/* ack */
  	sum += *sp++;
  	sum += *sp++;	/* off */
  	sum += *sp++;	/* win */
  	sum += *sp++;	/* Skip over checksum */
  	sum += *sp++;	/* urp */
  
  # ifdef	__sgi
  	/*
  	 * In case we had to copy the IP & TCP header out of mbufs,
  	 * skip over the mbuf bits which are the header
  	 */
  	if ((caddr_t)ip != mtod(m, caddr_t)) {
  		hlen = (caddr_t)sp - (caddr_t)ip;
  		while (hlen) {
  			add = MIN(hlen, m->m_len);
  			sp = (u_short *)(mtod(m, caddr_t) + add);
  			hlen -= add;
  			if (add == m->m_len) {
  				m = m->m_next;
  				if (!hlen) {
  					if (!m)
  						break;
  					sp = mtod(m, u_short *);
  				}
  				PANIC((!m),("fr_tcpsum(1): not enough data"));
  			}
  		}
  	}
  # endif
  
  	if (!(len -= sizeof(*tcp)))
  		goto nodata;
  	while (len > 1) {
  		if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
  			m = m->m_next;
  			PANIC((!m),("fr_tcpsum(2): not enough data"));
  			sp = mtod(m, u_short *);
  		}
  		if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
  			bytes.c[0] = *(u_char *)sp;
  			m = m->m_next;
  			PANIC((!m),("fr_tcpsum(3): not enough data"));
  			sp = mtod(m, u_short *);
  			bytes.c[1] = *(u_char *)sp;
  			sum += bytes.s;
  			sp = (u_short *)((u_char *)sp + 1);
  		}
  		if ((u_long)sp & 1) {
  			bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
  			sum += bytes.s;
  		} else
  			sum += *sp++;
  		len -= 2;
  	}
  	if (len)
  		sum += ntohs(*(u_char *)sp << 8);
  nodata:
  	while (sum > 0xffff)
  		sum = (sum & 0xffff) + (sum >> 16);
  	sum2 = (u_short)(~sum & 0xffff);
  }
  #  endif /*  defined(BSD) || defined(sun) */
  # endif /* SOLARIS */
  #else /* KERNEL */
  	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 */
  	tcp->th_sum = ts;
  	return sum2;
  }
  
  
  #if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
  /*
   * Copyright (c) 1982, 1986, 1988, 1991, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *	This product includes software developed by the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   *	@(#)uipc_mbuf.c	8.2 (Berkeley) 1/4/94
   * Id: fil.c,v 2.35.2.63 2002/08/28 12:40:08 darrenr Exp
   */
  /*
   * Copy data from an mbuf chain starting "off" bytes from the beginning,
   * continuing for "len" bytes, into the indicated buffer.
   */
  void
  m_copydata(m, off, len, cp)
  	register mb_t *m;
  	register int off;
  	register int len;
  	caddr_t cp;
  {
  	register unsigned count;
  
  	if (off < 0 || len < 0)
  		panic("m_copydata");
  	while (off > 0) {
  		if (m == 0)
  			panic("m_copydata");
  		if (off < m->m_len)
  			break;
  		off -= m->m_len;
  		m = m->m_next;
  	}
  	while (len > 0) {
  		if (m == 0)
  			panic("m_copydata");
  		count = MIN(m->m_len - off, len);
  		bcopy(mtod(m, caddr_t) + off, cp, count);
  		len -= count;
  		cp += count;
  		off = 0;
  		m = m->m_next;
  	}
  }
  
  
  # ifndef linux
  /*
   * Copy data from a buffer back into the indicated mbuf chain,
   * starting "off" bytes from the beginning, extending the mbuf
   * chain if necessary.
   */
  void
  m_copyback(m0, off, len, cp)
  	struct	mbuf *m0;
  	register int off;
  	register int len;
  	caddr_t cp;
  {
  	register int mlen;
  	register struct mbuf *m = m0, *n;
  	int totlen = 0;
  
  	if (m0 == 0)
  		return;
  	while (off > (mlen = m->m_len)) {
  		off -= mlen;
  		totlen += mlen;
  		if (m->m_next == 0) {
  			n = m_getclr(M_DONTWAIT, m->m_type);
  			if (n == 0)
  				goto out;
  			n->m_len = min(MLEN, len + off);
  			m->m_next = n;
  		}
  		m = m->m_next;
  	}
  	while (len > 0) {
  		mlen = min (m->m_len - off, len);
  		bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
  		cp += mlen;
  		len -= mlen;
  		mlen += off;
  		off = 0;
  		totlen += mlen;
  		if (len == 0)
  			break;
  		if (m->m_next == 0) {
  			n = m_get(M_DONTWAIT, m->m_type);
  			if (n == 0)
  				break;
  			n->m_len = min(MLEN, len);
  			m->m_next = n;
  		}
  		m = m->m_next;
  	}
  out:
  #if 0
  	if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
  		m->m_pkthdr.len = totlen;
  #endif
  	return;
  }
  # endif /* linux */
  #endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
  
  
  frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
  u_32_t num, flags;
  minor_t which;
  int set;
  frgroup_t ***fgpp;
  {
  	frgroup_t *fg, **fgp;
  
  	if (which == IPL_LOGAUTH)
  		fgp = &ipfgroups[2][set];
  	else if (flags & FR_ACCOUNT)
  		fgp = &ipfgroups[1][set];
  	else if (flags & (FR_OUTQUE|FR_INQUE))
  		fgp = &ipfgroups[0][set];
  	else
  		return NULL;
  
  	while ((fg = *fgp))
  		if (fg->fg_num == num)
  			break;
  		else
  			fgp = &fg->fg_next;
  	if (fgpp)
  		*fgpp = fgp;
  	return fg;
  }
  
  
  frgroup_t *fr_addgroup(num, fp, which, set)
  u_32_t num;
  frentry_t *fp;
  minor_t which;
  int set;
  {
  	frgroup_t *fg, **fgp;
  
  	if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
  		return fg;
  
  	KMALLOC(fg, frgroup_t *);
  	if (fg) {
  		fg->fg_num = num;
  		fg->fg_next = *fgp;
  		fg->fg_head = fp;
  		fg->fg_start = &fp->fr_grp;
  		*fgp = fg;
  	}
  	return fg;
  }
  
  
  void fr_delgroup(num, flags, which, set)
  u_32_t num, flags;
  minor_t which;
  int set;
  {
  	frgroup_t *fg, **fgp;
   
  	if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
  		return;
   
  	*fgp = fg->fg_next;
  	KFREE(fg);
  }
  
  
  
  /*
   * recursively flush rules from the list, descending groups as they are
   * encountered.  if a rule is the head of a group and it has lost all its
   * group members, then also delete the group reference.
   */
  static int frflushlist(set, unit, nfreedp, listp)
  int set;
  minor_t unit;
  int *nfreedp;
  frentry_t **listp;
  {
  	register int freed = 0, i;
  	register frentry_t *fp;
  
  	while ((fp = *listp)) {
  		*listp = fp->fr_next;
  		if (fp->fr_grp) {
  			i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
  			MUTEX_ENTER(&ipf_rw);
  			fp->fr_ref -= i;
  			MUTEX_EXIT(&ipf_rw);
  		}
  
  		ATOMIC_DEC32(fp->fr_ref);
  		if (fp->fr_grhead) {
  			fr_delgroup(fp->fr_grhead, fp->fr_flags, 
  				    unit, set);
  			fp->fr_grhead = 0;
  		}
  		if (fp->fr_ref == 0) {
  			KFREE(fp);
  			freed++;
  		} else
  			fp->fr_next = NULL;
  	}
  	*nfreedp += freed;
  	return freed;
  }
  
  
  int frflush(unit, flags)
  minor_t unit;
  int flags;
  {
  	int flushed = 0, set;
  
  	if (unit != IPL_LOGIPF)
  		return 0;
  	WRITE_ENTER(&ipf_mutex);
  	bzero((char *)frcache, sizeof(frcache[0]) * 2);
  
  	set = fr_active;
  	if (flags & FR_INACTIVE)
  		set = 1 - set;
  
  	if (flags & FR_OUTQUE) {
  #ifdef	USE_INET6
  		(void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]);
  		(void) frflushlist(set, unit, &flushed, &ipacct6[1][set]);
  #endif
  		(void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
  		(void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
  	}
  	if (flags & FR_INQUE) {
  #ifdef	USE_INET6
  		(void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]);
  		(void) frflushlist(set, unit, &flushed, &ipacct6[0][set]);
  #endif
  		(void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
  		(void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
  	}
  	RWLOCK_EXIT(&ipf_mutex);
  	return flushed;
  }
  
  
  char *memstr(src, dst, slen, dlen)
  char *src, *dst;
  int slen, dlen;
  {
  	char *s = NULL;
  
  	while (dlen >= slen) {
  		if (bcmp(src, dst, slen) == 0) {
  			s = dst;
  			break;
  		}
  		dst++;
  		dlen--;
  	}
  	return s;
  }
  
  
  void fixskip(listp, rp, addremove)
  frentry_t **listp, *rp;
  int addremove;
  {
  	frentry_t *fp;
  	int rules = 0, rn = 0;
  
  	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
  		;
  
  	if (!fp)
  		return;
  
  	for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
  		if (fp->fr_skip && (rn + fp->fr_skip >= rules))
  			fp->fr_skip += addremove;
  }
  
  
  #ifdef	_KERNEL
  /*
   * count consecutive 1's in bit mask.  If the mask generated by counting
   * consecutive 1's is different to that passed, return -1, else return #
   * of bits.
   */
  int	countbits(ip)
  u_32_t	ip;
  {
  	u_32_t	ipn;
  	int	cnt = 0, i, j;
  
  	ip = ipn = ntohl(ip);
  	for (i = 32; i; i--, ipn *= 2)
  		if (ipn & 0x80000000)
  			cnt++;
  		else
  			break;
  	ipn = 0;
  	for (i = 32, j = cnt; i; i--, j--) {
  		ipn *= 2;
  		if (j > 0)
  			ipn++;
  	}
  	if (ipn == ip)
  		return cnt;
  	return -1;
  }
  
  
  /*
   * return the first IP Address associated with an interface
   */
  int fr_ifpaddr(v, ifptr, inp)
  int v;
  void *ifptr;
  struct in_addr *inp;
  {
  # ifdef	USE_INET6
  	struct in6_addr *inp6 = NULL;
  # endif
  # if SOLARIS
  	ill_t *ill = ifptr;
  # else
  	struct ifnet *ifp = ifptr;
  # endif
  	struct in_addr in;
  
  # if SOLARIS
  #  ifdef	USE_INET6
  	if (v == 6) {
  		struct in6_addr in6;
  
  		/*
  		 * First is always link local.
  		 */
  		if (ill->ill_ipif->ipif_next)
  			in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
  		else
  			bzero((char *)&in6, sizeof(in6));
  		bcopy((char *)&in6, (char *)inp, sizeof(in6));
  	} else
  #  endif
  	{
  		in.s_addr = ill->ill_ipif->ipif_local_addr;
  		*inp = in;
  	}
  # else /* SOLARIS */
  #  if linux
  	;
  #  else /* linux */
  	struct sockaddr_in *sin;
  	struct ifaddr *ifa;
  
  #   if	(__FreeBSD_version >= 300000)
  	ifa = TAILQ_FIRST(&ifp->if_addrhead);
  #   else
  #    if defined(__NetBSD__) || defined(__OpenBSD__)
  	ifa = TAILQ_FIRST(&ifp->if_addrlist);
  #    else
  #     if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
  	ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
  #     else
  	ifa = ifp->if_addrlist;
  #     endif
  #    endif /* __NetBSD__ || __OpenBSD__ */
  #   endif /* __FreeBSD_version >= 300000 */
  #   if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
  	sin = (struct sockaddr_in *)&ifa->ifa_addr;
  #   else
  	sin = (struct sockaddr_in *)ifa->ifa_addr;
  	while (sin && ifa) {
  		if ((v == 4) && (sin->sin_family == AF_INET))
  			break;
  #    ifdef USE_INET6
  		if ((v == 6) && (sin->sin_family == AF_INET6)) {
  			inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
  			if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
  			    !IN6_IS_ADDR_LOOPBACK(inp6))
  				break;
  		}
  #    endif
  #    if	(__FreeBSD_version >= 300000)
  		ifa = TAILQ_NEXT(ifa, ifa_link);
  #    else
  #     if defined(__NetBSD__) || defined(__OpenBSD__)
  		ifa = ifa->ifa_list.tqe_next;
  #     else
  		ifa = ifa->ifa_next;
  #     endif
  #    endif /* __FreeBSD_version >= 300000 */
  		if (ifa)
  			sin = (struct sockaddr_in *)ifa->ifa_addr;
  	}
  	if (ifa == NULL)
  		sin = NULL;
  	if (sin == NULL)
  		return -1;
  #   endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
  #    ifdef	USE_INET6
  	if (v == 6)
  		bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
  	else
  #    endif
  	{
  		in = sin->sin_addr;
  		*inp = in;
  	}
  #  endif /* linux */
  # endif /* SOLARIS */
  	return 0;
  }
  
  
  static void frsynclist(fr)
  register frentry_t *fr;
  {
  	for (; fr; fr = fr->fr_next) {
  		if (fr->fr_ifa != NULL) {
  			fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v);
  			if (fr->fr_ifa == NULL)
  				fr->fr_ifa = (void *)-1;
  		}
  		if (fr->fr_grp)
  			frsynclist(fr->fr_grp);
  	}
  }
  
  
  void frsync()
  {
  # if !SOLARIS
  	register struct ifnet *ifp;
  
  #  if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
       (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
  #   if (NetBSD >= 199905) || defined(__OpenBSD__)
  	for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
  #   else
  	for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_link))
  #   endif
  #  else
  	for (ifp = ifnet; ifp; ifp = ifp->if_next)
  #  endif
  	{
  		ip_natsync(ifp);
  		ip_statesync(ifp);
  	}
  	ip_natsync((struct ifnet *)-1);
  # endif /* !SOLARIS */
  
  	WRITE_ENTER(&ipf_mutex);
  	frsynclist(ipacct[0][fr_active]);
  	frsynclist(ipacct[1][fr_active]);
  	frsynclist(ipfilter[0][fr_active]);
  	frsynclist(ipfilter[1][fr_active]);
  #ifdef	USE_INET6
  	frsynclist(ipacct6[0][fr_active]);
  	frsynclist(ipacct6[1][fr_active]);
  	frsynclist(ipfilter6[0][fr_active]);
  	frsynclist(ipfilter6[1][fr_active]);
  #endif
  	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.
   */
  int ircopyptr(a, b, c)
  void *a, *b;
  size_t c;
  {
  	caddr_t ca;
  	int err;
  
  #if SOLARIS
  	if (copyin(a, (char *)&ca, sizeof(ca)))
  		return EFAULT;
  #else
  	bcopy(a, &ca, sizeof(ca));
  #endif
  	err = copyin(ca, b, c);
  	if (err)
  		err = EFAULT;
  	return err;
  }
  
  
  int iwcopyptr(a, b, c)
  void *a, *b;
  size_t c;
  {
  	caddr_t ca;
  	int err;
  
  #if SOLARIS
  	if (copyin(b, (char *)&ca, sizeof(ca)))
  		return EFAULT;
  #else
  	bcopy(b, &ca, sizeof(ca));
  #endif
  	err = copyout(a, ca, c);
  	if (err)
  		err = EFAULT;
  	return err;
  }
  
  #else /* _KERNEL */
  
  
  /*
   * return the first IP Address associated with an interface
   */
  int fr_ifpaddr(v, ifptr, inp)
  int v;
  void *ifptr;
  struct in_addr *inp;
  {
  	return 0;
  }
  
  
  int ircopyptr(a, b, c)
  void *a, *b;
  size_t c;
  {
  	caddr_t ca;
  
  	bcopy(a, &ca, sizeof(ca));
  	bcopy(ca, b, c);
  	return 0;
  }
  
  
  int iwcopyptr(a, b, c)
  void *a, *b;
  size_t c;
  {
  	caddr_t ca;
  
  	bcopy(b, &ca, sizeof(ca));
  	bcopy(a, ca, c);
  	return 0;
  }
  
  
  #endif
  
  
  int fr_lock(data, lockp)
  caddr_t data;
  int *lockp;
  {
  	int arg, error;
  
  	error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
  	if (!error) {
  		error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
  		if (!error)
  			*lockp = arg;
  	}
  	return error;
  }
  
  
  void fr_getstat(fiop)
  friostat_t *fiop;
  {
  	bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
  	fiop->f_locks[0] = fr_state_lock;
  	fiop->f_locks[1] = fr_nat_lock;
  	fiop->f_locks[2] = fr_frag_lock;
  	fiop->f_locks[3] = fr_auth_lock;
  	fiop->f_fin[0] = ipfilter[0][0];
  	fiop->f_fin[1] = ipfilter[0][1];
  	fiop->f_fout[0] = ipfilter[1][0];
  	fiop->f_fout[1] = ipfilter[1][1];
  	fiop->f_acctin[0] = ipacct[0][0];
  	fiop->f_acctin[1] = ipacct[0][1];
  	fiop->f_acctout[0] = ipacct[1][0];
  	fiop->f_acctout[1] = ipacct[1][1];
  #ifdef	USE_INET6
  	fiop->f_fin6[0] = ipfilter6[0][0];
  	fiop->f_fin6[1] = ipfilter6[0][1];
  	fiop->f_fout6[0] = ipfilter6[1][0];
  	fiop->f_fout6[1] = ipfilter6[1][1];
  	fiop->f_acctin6[0] = ipacct6[0][0];
  	fiop->f_acctin6[1] = ipacct6[0][1];
  	fiop->f_acctout6[0] = ipacct6[1][0];
  	fiop->f_acctout6[1] = ipacct6[1][1];
  #else
  	fiop->f_fin6[0] = NULL;
  	fiop->f_fin6[1] = NULL;
  	fiop->f_fout6[0] = NULL;
  	fiop->f_fout6[1] = NULL;
  	fiop->f_acctin6[0] = NULL;
  	fiop->f_acctin6[1] = NULL;
  	fiop->f_acctout6[0] = NULL;
  	fiop->f_acctout6[1] = NULL;
  #endif
  	fiop->f_active = fr_active;
  	fiop->f_froute[0] = ipl_frouteok[0];
  	fiop->f_froute[1] = ipl_frouteok[1];
  
  	fiop->f_running = fr_running;
  	fiop->f_groups[0][0] = ipfgroups[0][0];
  	fiop->f_groups[0][1] = ipfgroups[0][1];
  	fiop->f_groups[1][0] = ipfgroups[1][0];
  	fiop->f_groups[1][1] = ipfgroups[1][1];
  	fiop->f_groups[2][0] = ipfgroups[2][0];
  	fiop->f_groups[2][1] = ipfgroups[2][1];
  #ifdef  IPFILTER_LOG
  	fiop->f_logging = 1;
  #else
  	fiop->f_logging = 0;
  #endif
  	fiop->f_defpass = fr_pass;
  	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 */
  };
  #endif
  
  
  #ifndef	_KERNEL
  int mbuflen(buf)
  mb_t *buf;
  {
  	ip_t *ip;
  
  	ip = (ip_t *)buf;
  	return ip->ip_len;
  }
  #endif
  