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authorPeter Wemm <peter@FreeBSD.org>1997-03-02 15:49:41 +0000
committerPeter Wemm <peter@FreeBSD.org>1997-03-02 15:49:41 +0000
commit3589f3628a5b767f1bfec12dfd5e1cdf1eaee79e (patch)
tree398841aa120f249bb97fd26c4bbf90be8ca5d4e1
downloadsrc-3589f3628a5b767f1bfec12dfd5e1cdf1eaee79e.tar.gz
src-3589f3628a5b767f1bfec12dfd5e1cdf1eaee79e.zip
Replacement import of ipfilter 3.1.7 components used in kernel.vendor/ipfilter-sys/ipfilter3_1_7
(This is to repair the vendor branching)
Notes
Notes: svn path=/vendor-sys/ipfilter/dist-old/; revision=23282 svn path=/vendor-sys/ipfilter/ipfilter3_1_7/; revision=23284; tag=vendor/ipfilter-sys/ipfilter3_1_7
-rw-r--r--sys/netinet/fil.c762
-rw-r--r--sys/netinet/ip_compat.h342
-rw-r--r--sys/netinet/ip_fil.c885
-rw-r--r--sys/netinet/ip_fil.h293
-rw-r--r--sys/netinet/ip_frag.c278
-rw-r--r--sys/netinet/ip_frag.h47
-rw-r--r--sys/netinet/ip_nat.c886
-rw-r--r--sys/netinet/ip_nat.h118
-rw-r--r--sys/netinet/ip_state.c536
-rw-r--r--sys/netinet/ip_state.h86
10 files changed, 4233 insertions, 0 deletions
diff --git a/sys/netinet/fil.c b/sys/netinet/fil.c
new file mode 100644
index 000000000000..de776f9fc5c8
--- /dev/null
+++ b/sys/netinet/fil.c
@@ -0,0 +1,762 @@
+/*
+ * (C)opyright 1993-1996 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint) && defined(LIBC_SCCS)
+static char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-1996 Darren Reed";
+static char rcsid[] = "$Id: fil.c,v 2.0.1.4 1997/02/04 13:59:41 darrenr Exp $";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#if defined(_KERNEL) || defined(KERNEL)
+# include <sys/systm.h>
+#else
+# include <stdio.h>
+# include <string.h>
+#endif
+#include <sys/uio.h>
+#if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+#else
+# include <sys/byteorder.h>
+# include <sys/dditypes.h>
+# include <sys/stream.h>
+#endif
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#ifdef sun
+# include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_nat.h"
+#include "ip_frag.h"
+#include "ip_state.h"
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+#ifndef _KERNEL
+#include "ipf.h"
+extern int opts;
+extern void debug(), verbose();
+
+#define FR_IFVERBOSE(ex,second,verb_pr) if (ex) { verbose verb_pr; second; }
+#define FR_IFDEBUG(ex,second,verb_pr) if (ex) { debug verb_pr; second; }
+#define FR_VERBOSE(verb_pr) verbose verb_pr
+#define FR_DEBUG(verb_pr) debug verb_pr
+#define FR_SCANLIST(p, ip, fi, m) fr_scanlist(p, ip, fi)
+# if SOLARIS
+# define bcmp memcmp
+# endif
+#else
+#define FR_IFVERBOSE(ex,second,verb_pr) ;
+#define FR_IFDEBUG(ex,second,verb_pr) ;
+#define FR_VERBOSE(verb_pr)
+#define FR_DEBUG(verb_pr)
+#define FR_SCANLIST(p, ip, fi, m) fr_scanlist(p, ip, fi, m)
+extern int send_reset();
+# if SOLARIS
+extern int icmp_error(), ipfr_fastroute();
+extern kmutex_t ipf_mutex, ipl_mutex;
+# else
+extern void ipfr_fastroute();
+# endif
+extern int ipl_unreach, ipllog();
+#endif
+
+#if SOLARIS
+# define SEND_RESET(ip, if, q) send_reset(ip, qif, q)
+# define ICMP_ERROR(b, ip, t, c, if, src) \
+ icmp_error(b, ip, t, c, if, src)
+#else
+# define SEND_RESET(ip, if, q) send_reset(ip)
+# if BSD < 199103
+# define ICMP_ERROR(b, ip, t, c, if, src) \
+ icmp_error(mtod(b, ip_t *), t, c, if, src)
+# else
+# define ICMP_ERROR(b, ip, t, c, if, src) \
+ icmp_error(b, t, c, (src).s_addr, if)
+# endif
+#endif
+
+struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
+struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
+ *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
+int fr_flags = 0, fr_active = 0;
+
+fr_info_t frcache[2];
+
+
+/*
+ * bit values for identifying presence of individual IP options
+ */
+struct optlist ipopts[20] = {
+ { IPOPT_NOP, 0x000001 },
+ { IPOPT_RR, 0x000002 },
+ { IPOPT_ZSU, 0x000004 },
+ { IPOPT_MTUP, 0x000008 },
+ { IPOPT_MTUR, 0x000010 },
+ { IPOPT_ENCODE, 0x000020 },
+ { IPOPT_TS, 0x000040 },
+ { IPOPT_TR, 0x000080 },
+ { IPOPT_SECURITY, 0x000100 },
+ { IPOPT_LSRR, 0x000200 },
+ { IPOPT_E_SEC, 0x000400 },
+ { IPOPT_CIPSO, 0x000800 },
+ { IPOPT_SATID, 0x001000 },
+ { IPOPT_SSRR, 0x002000 },
+ { IPOPT_ADDEXT, 0x004000 },
+ { IPOPT_VISA, 0x008000 },
+ { IPOPT_IMITD, 0x010000 },
+ { IPOPT_EIP, 0x020000 },
+ { IPOPT_FINN, 0x040000 },
+ { 0, 0x000000 }
+};
+
+/*
+ * bit values for identifying presence of individual IP security options
+ */
+struct optlist secopt[8] = {
+ { IPSO_CLASS_RES4, 0x01 },
+ { IPSO_CLASS_TOPS, 0x02 },
+ { IPSO_CLASS_SECR, 0x04 },
+ { IPSO_CLASS_RES3, 0x08 },
+ { IPSO_CLASS_CONF, 0x10 },
+ { IPSO_CLASS_UNCL, 0x20 },
+ { IPSO_CLASS_RES2, 0x40 },
+ { IPSO_CLASS_RES1, 0x80 }
+};
+
+
+/*
+ * compact the IP header into a structure which contains just the info.
+ * which is useful for comparing IP headers with.
+ */
+void fr_makefrip(hlen, ip, fin)
+int hlen;
+ip_t *ip;
+fr_info_t *fin;
+{
+ struct optlist *op;
+ tcphdr_t *tcp;
+ fr_ip_t *fi = &fin->fin_fi;
+ u_short optmsk = 0, secmsk = 0, auth = 0;
+ int i, mv, ol, off;
+ u_char *s, opt;
+
+ fin->fin_fr = NULL;
+ fin->fin_tcpf = 0;
+ fin->fin_data[0] = 0;
+ fin->fin_data[1] = 0;
+ fin->fin_rule = -1;
+#ifdef _KERNEL
+ fin->fin_icode = ipl_unreach;
+#endif
+ fi->fi_v = ip->ip_v;
+ fi->fi_tos = ip->ip_tos;
+ fin->fin_hlen = hlen;
+ fin->fin_dlen = ip->ip_len - hlen;
+ tcp = (tcphdr_t *)((char *)ip + hlen);
+ fin->fin_dp = (void *)tcp;
+ (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
+ (*(((u_long *)fi) + 1)) = (*(((u_long *)ip) + 3));
+ (*(((u_long *)fi) + 2)) = (*(((u_long *)ip) + 4));
+
+ fi->fi_fl = (hlen > sizeof(struct ip)) ? FI_OPTIONS : 0;
+ off = (ip->ip_off & 0x1fff) << 3;
+ if (ip->ip_off & 0x3fff)
+ fi->fi_fl |= FI_FRAG;
+ switch (ip->ip_p)
+ {
+ case IPPROTO_ICMP :
+ if ((!IPMINLEN(ip, icmp) && !off) ||
+ (off && off < sizeof(struct icmp)))
+ fi->fi_fl |= FI_SHORT;
+ if (fin->fin_dlen > 1)
+ fin->fin_data[0] = *(u_short *)tcp;
+ break;
+ case IPPROTO_TCP :
+ fi->fi_fl |= FI_TCPUDP;
+ if ((!IPMINLEN(ip, tcphdr) && !off) ||
+ (off && off < sizeof(struct tcphdr)))
+ fi->fi_fl |= FI_SHORT;
+ if (!(fi->fi_fl & FI_SHORT) && !off)
+ fin->fin_tcpf = tcp->th_flags;
+ goto getports;
+ case IPPROTO_UDP :
+ fi->fi_fl |= FI_TCPUDP;
+ if ((!IPMINLEN(ip, udphdr) && !off) ||
+ (off && off < sizeof(struct udphdr)))
+ fi->fi_fl |= FI_SHORT;
+getports:
+ if (!off && (fin->fin_dlen > 3)) {
+ fin->fin_data[0] = ntohs(tcp->th_sport);
+ fin->fin_data[1] = ntohs(tcp->th_dport);
+ }
+ break;
+ default :
+ break;
+ }
+
+
+ for (s = (u_char *)(ip + 1), hlen -= sizeof(*ip); hlen; ) {
+ if (!(opt = *s))
+ break;
+ ol = (opt == IPOPT_NOP) ? 1 : (int)*(s+1);
+ if (opt > 1 && (ol < 2 || ol > hlen))
+ break;
+ for (i = 9, mv = 4; mv >= 0; ) {
+ op = ipopts + i;
+ if (opt == (u_char)op->ol_val) {
+ optmsk |= op->ol_bit;
+ if (opt == IPOPT_SECURITY) {
+ struct optlist *sp;
+ u_char sec;
+ int j, m;
+
+ sec = *(s + 2); /* classification */
+ for (j = 3, m = 2; m >= 0; ) {
+ sp = secopt + j;
+ if (sec == sp->ol_val) {
+ secmsk |= sp->ol_bit;
+ auth = *(s + 3);
+ auth *= 256;
+ auth += *(s + 4);
+ break;
+ }
+ if (sec < sp->ol_val)
+ j -= m--;
+ else
+ j += m--;
+ }
+ }
+ break;
+ }
+ if (opt < op->ol_val)
+ i -= mv--;
+ else
+ i += mv--;
+ }
+ hlen -= ol;
+ s += ol;
+ }
+ if (auth && !(auth & 0x0100))
+ auth &= 0xff00;
+ fi->fi_optmsk = optmsk;
+ fi->fi_secmsk = secmsk;
+ fi->fi_auth = auth;
+}
+
+
+/*
+ * check an IP packet for TCP/UDP characteristics such as ports and flags.
+ */
+int fr_tcpudpchk(fr, fin)
+frentry_t *fr;
+fr_info_t *fin;
+{
+ register u_short po, tup;
+ register char i;
+ register int err = 1;
+
+ /*
+ * Both ports should *always* be in the first fragment.
+ * So far, I cannot find any cases where they can not be.
+ *
+ * compare destination ports
+ */
+ if ((i = (int)fr->fr_dcmp)) {
+ po = fr->fr_dport;
+ tup = fin->fin_data[1];
+ /*
+ * Do opposite test to that required and
+ * continue if that succeeds.
+ */
+ if (!--i && tup != po) /* EQUAL */
+ err = 0;
+ else if (!--i && tup == po) /* NOTEQUAL */
+ err = 0;
+ else if (!--i && tup >= po) /* LESSTHAN */
+ err = 0;
+ else if (!--i && tup <= po) /* GREATERTHAN */
+ err = 0;
+ else if (!--i && tup > po) /* LT or EQ */
+ err = 0;
+ else if (!--i && tup < po) /* GT or EQ */
+ err = 0;
+ else if (!--i && /* Out of range */
+ (tup >= po && tup <= fr->fr_dtop))
+ err = 0;
+ else if (!--i && /* In range */
+ (tup <= po || tup >= fr->fr_dtop))
+ err = 0;
+ }
+ /*
+ * compare source ports
+ */
+ if (err && (i = (int)fr->fr_scmp)) {
+ po = fr->fr_sport;
+ tup = fin->fin_data[0];
+ if (!--i && tup != po)
+ err = 0;
+ else if (!--i && tup == po)
+ err = 0;
+ else if (!--i && tup >= po)
+ err = 0;
+ else if (!--i && tup <= po)
+ err = 0;
+ else if (!--i && tup > po)
+ err = 0;
+ else if (!--i && tup < po)
+ err = 0;
+ else if (!--i && /* Out of range */
+ (tup >= po && tup <= fr->fr_stop))
+ err = 0;
+ else if (!--i && /* In range */
+ (tup <= po || tup >= fr->fr_stop))
+ err = 0;
+ }
+
+ /*
+ * If we don't have all the TCP/UDP header, then how can we
+ * expect to do any sort of match on it ? If we were looking for
+ * TCP flags, then NO match. If not, then match (which should
+ * satisfy the "short" class too).
+ */
+ if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
+ if (fin->fin_fi.fi_fl & FI_SHORT)
+ return !(fr->fr_tcpf | fr->fr_tcpfm);
+ /*
+ * Match the flags ? If not, abort this match.
+ */
+ if (fr->fr_tcpf &&
+ fr->fr_tcpf != (fin->fin_tcpf & fr->fr_tcpfm)) {
+ FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
+ fr->fr_tcpfm, fr->fr_tcpf));
+ err = 0;
+ }
+ }
+ return err;
+}
+
+/*
+ * Check the input/output list of rules for a match and result.
+ * Could be per interface, but this gets real nasty when you don't have
+ * kernel sauce.
+ */
+int fr_scanlist(pass, ip, fin, m)
+int pass;
+ip_t *ip;
+register fr_info_t *fin;
+void *m;
+{
+ register struct frentry *fr;
+ register fr_ip_t *fi = &fin->fin_fi;
+ int rulen, portcmp = 0, off;
+
+ fr = fin->fin_fr;
+ fin->fin_fr = NULL;
+ fin->fin_rule = 0;
+ off = ip->ip_off & 0x1fff;
+ pass |= (fi->fi_fl << 20);
+
+ if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
+ portcmp = 1;
+
+ for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
+ /*
+ * In all checks below, a null (zero) value in the
+ * filter struture is taken to mean a wildcard.
+ *
+ * check that we are working for the right interface
+ */
+#ifdef _KERNEL
+ if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
+ continue;
+#else
+ if (opts & (OPT_VERBOSE|OPT_DEBUG))
+ printf("\n");
+ FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' : 'b'));
+ if (fin->fin_ifp && *fr->fr_ifname &&
+ strcasecmp((char *)fin->fin_ifp, fr->fr_ifname))
+ continue;
+ FR_VERBOSE((":i"));
+#endif
+ {
+ register u_long *ld, *lm, *lip;
+ register int i;
+
+ lip = (u_long *)fi;
+ lm = (u_long *)&fr->fr_mip;
+ ld = (u_long *)&fr->fr_ip;
+ i = ((lip[0] & lm[0]) != ld[0]);
+ FR_IFDEBUG(i,continue,("0. %#08x & %#08x != %#08x\n",
+ lip[0], lm[0], ld[0]));
+ i |= ((lip[1] & lm[1]) != ld[1]);
+ FR_IFDEBUG(i,continue,("1. %#08x & %#08x != %#08x\n",
+ lip[1], lm[1], ld[1]));
+ i |= ((lip[2] & lm[2]) != ld[2]);
+ FR_IFDEBUG(i,continue,("2. %#08x & %#08x != %#08x\n",
+ lip[2], lm[2], ld[2]));
+ i |= ((lip[3] & lm[3]) != ld[3]);
+ FR_IFDEBUG(i,continue,("3. %#08x & %#08x != %#08x\n",
+ lip[3], lm[3], ld[3]));
+ i |= ((lip[4] & lm[4]) != ld[4]);
+ FR_IFDEBUG(i,continue,("4. %#08x & %#08x != %#08x\n",
+ lip[4], lm[4], ld[4]));
+ if (i)
+ continue;
+ }
+
+ /*
+ * If a fragment, then only the first has what we're looking
+ * for here...
+ */
+ if (fi->fi_fl & FI_TCPUDP) {
+ if (portcmp) {
+ if (!fr_tcpudpchk(fr, fin))
+ continue;
+ } else if (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
+ fr->fr_tcpfm)
+ continue;
+ } else if (fi->fi_p == IPPROTO_ICMP) {
+ if (!off && (fin->fin_dlen > 1)) {
+ if ((fin->fin_data[0] & fr->fr_icmpm) !=
+ fr->fr_icmp) {
+ FR_DEBUG(("i. %#x & %#x != %#x\n",
+ fin->fin_data[0],
+ fr->fr_icmpm, fr->fr_icmp));
+ continue;
+ }
+ } else if (fr->fr_icmpm || fr->fr_icmp)
+ continue;
+ }
+ FR_VERBOSE(("*"));
+ /*
+ * Just log this packet...
+ */
+ pass = fr->fr_flags;
+ if ((pass & FR_CALLNOW) && fr->fr_func)
+ pass = (*fr->fr_func)(pass, ip, fin);
+#ifdef IPFILTER_LOG
+ if ((pass & FR_LOGMASK) == FR_LOG) {
+ if (!ipllog(fr->fr_flags, ip, fin, m))
+ frstats[fin->fin_out].fr_skip++;
+ frstats[fin->fin_out].fr_pkl++;
+ }
+#endif /* IPFILTER_LOG */
+ FR_DEBUG(("pass %#x\n", pass));
+ fr->fr_hits++;
+ if (pass & FR_ACCOUNT)
+ fr->fr_bytes += ip->ip_len;
+ else
+ fin->fin_icode = fr->fr_icode;
+ fin->fin_rule = rulen;
+ fin->fin_fr = fr;
+ if (pass & FR_QUICK)
+ break;
+ }
+ return pass;
+}
+
+
+/*
+ * frcheck - filter check
+ * check using source and destination addresses/pors in a packet whether
+ * or not to pass it on or not.
+ */
+int fr_check(ip, hlen, ifp, out
+#ifdef _KERNEL
+# if SOLARIS
+, qif, q, mp)
+qif_t *qif;
+queue_t *q;
+mblk_t **mp;
+# else
+, mp)
+struct mbuf **mp;
+# endif
+#else
+)
+#endif
+ip_t *ip;
+int hlen;
+struct ifnet *ifp;
+int out;
+{
+ /*
+ * The above really sucks, but short of writing a diff
+ */
+ fr_info_t frinfo, *fc;
+ register fr_info_t *fin = &frinfo;
+ frentry_t *fr = NULL;
+ int pass, changed;
+
+#if !defined(__SVR4) && !defined(__svr4__) && defined(_KERNEL)
+ register struct mbuf *m = *mp;
+ struct mbuf *mc = NULL;
+
+ if ((ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP ||
+ ip->ip_p == IPPROTO_ICMP)) {
+ register int up = MIN(hlen + 8, ip->ip_len);
+
+ if (up > m->m_len) {
+ if ((*mp = m_pullup(m, up)) == 0) {
+ frstats[out].fr_pull[1]++;
+ return -1;
+ } else {
+ frstats[out].fr_pull[0]++;
+ m = *mp;
+ ip = mtod(m, struct ip *);
+ }
+ }
+ }
+#endif
+#if SOLARIS && defined(_KERNEL)
+ mblk_t *mc = NULL, *m = qif->qf_m;
+#endif
+ fr_makefrip(hlen, ip, fin);
+ fin->fin_ifp = ifp;
+ fin->fin_out = out;
+
+ MUTEX_ENTER(&ipf_mutex);
+ if (!out) {
+ changed = ip_natin(ip, hlen, fin);
+ if ((fin->fin_fr = ipacct[0][fr_active]) &&
+ (FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
+ frstats[0].fr_acct++;
+ }
+
+ if ((pass = ipfr_knownfrag(ip, fin))) {
+ if ((pass & FR_KEEPSTATE)) {
+ if (fr_addstate(ip, fin, pass) == -1)
+ frstats[out].fr_bads++;
+ else
+ frstats[out].fr_ads++;
+ }
+ } else if ((pass = fr_checkstate(ip, fin))) {
+ if ((pass & FR_KEEPFRAG)) {
+ if (fin->fin_fi.fi_fl & FI_FRAG) {
+ if (ipfr_newfrag(ip, fin, pass) == -1)
+ frstats[out].fr_bnfr++;
+ else
+ frstats[out].fr_nfr++;
+ } else
+ frstats[out].fr_cfr++;
+ }
+ } else {
+ fc = frcache + out;
+ if (fc->fin_fr && !bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
+ /*
+ * copy cached data so we can unlock the mutex
+ * earlier.
+ */
+ bcopy((char *)fc, (char *)fin, sizeof(*fin));
+ frstats[out].fr_chit++;
+ pass = fin->fin_fr->fr_flags;
+ } else {
+ pass = FR_NOMATCH;
+ if ((fin->fin_fr = ipfilter[out][fr_active]))
+ pass = FR_SCANLIST(FR_NOMATCH, ip, fin, m);
+ bcopy((char *)fin, (char *)fc, FI_CSIZE);
+ if (pass & FR_NOMATCH) {
+ frstats[out].fr_nom++;
+#ifdef NOMATCH
+ pass |= NOMATCH;
+#endif
+ }
+ }
+ fr = fin->fin_fr;
+
+ if ((pass & FR_KEEPFRAG)) {
+ if (fin->fin_fi.fi_fl & FI_FRAG) {
+ if (ipfr_newfrag(ip, fin, pass) == -1)
+ frstats[out].fr_bnfr++;
+ else
+ frstats[out].fr_nfr++;
+ } else
+ frstats[out].fr_cfr++;
+ }
+ if (pass & FR_KEEPSTATE) {
+ if (fr_addstate(ip, fin, pass) == -1)
+ frstats[out].fr_bads++;
+ else
+ frstats[out].fr_ads++;
+ }
+ }
+
+ if (fr && fr->fr_func)
+ pass = (*fr->fr_func)(pass, ip, fin);
+
+ if (out) {
+ if ((fin->fin_fr = ipacct[1][fr_active]) &&
+ (FR_SCANLIST(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT))
+ frstats[1].fr_acct++;
+ fin->fin_fr = NULL;
+ changed = ip_natout(ip, hlen, fin);
+ }
+ fin->fin_fr = fr;
+ MUTEX_EXIT(&ipf_mutex);
+
+#ifdef IPFILTER_LOG
+ if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
+ if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
+ pass |= FF_LOGNOMATCH;
+ frstats[out].fr_npkl++;
+ goto logit;
+ } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
+ ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
+ if ((pass & FR_LOGMASK) != FR_LOGP)
+ pass |= FF_LOGPASS;
+ frstats[out].fr_ppkl++;
+ goto logit;
+ } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
+ ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
+ if ((pass & FR_LOGMASK) != FR_LOGB)
+ pass |= FF_LOGBLOCK;
+ frstats[out].fr_bpkl++;
+logit:
+ if (!ipllog(pass, ip, fin, m)) {
+ frstats[out].fr_skip++;
+ if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
+ (FR_PASS|FR_LOGORBLOCK))
+ pass ^= FR_PASS|FR_BLOCK;
+ }
+ }
+ }
+#endif /* IPFILTER_LOG */
+
+ if (pass & FR_PASS)
+ frstats[out].fr_pass++;
+ else if (pass & FR_BLOCK) {
+ frstats[out].fr_block++;
+ /*
+ * Should we return an ICMP packet to indicate error
+ * status passing through the packet filter ?
+ */
+#ifdef _KERNEL
+ if (pass & FR_RETICMP) {
+# if SOLARIS
+ ICMP_ERROR(q, ip, ICMP_UNREACH, fin->fin_icode,
+ qif, ip->ip_src);
+# else
+ ICMP_ERROR(m, ip, ICMP_UNREACH, fin->fin_icode,
+ ifp, ip->ip_src);
+ m = NULL; /* freed by icmp_error() */
+# endif
+
+ frstats[0].fr_ret++;
+ } else if ((pass & FR_RETRST) &&
+ !(fin->fin_fi.fi_fl & FI_SHORT)) {
+ if (SEND_RESET(ip, qif, q) == 0)
+ frstats[1].fr_ret++;
+ }
+#else
+ if (pass & FR_RETICMP) {
+ verbose("- ICMP unreachable sent\n");
+ frstats[0].fr_ret++;
+ } else if ((pass & FR_RETRST) &&
+ !(fin->fin_fi.fi_fl & FI_SHORT)) {
+ verbose("- TCP RST sent\n");
+ frstats[1].fr_ret++;
+ }
+#endif
+ }
+#ifdef _KERNEL
+# if !SOLARIS
+ if (pass & FR_DUP)
+ mc = m_copy(m, 0, M_COPYALL);
+ if (fr) {
+ frdest_t *fdp = &fr->fr_tif;
+
+ if ((pass & FR_FASTROUTE) ||
+ (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+ ipfr_fastroute(m, fin, fdp);
+ m = *mp = NULL;
+ pass = 0;
+ }
+ if (mc)
+ ipfr_fastroute(mc, fin, &fr->fr_dif);
+ }
+ if (!(pass & FR_PASS) && m)
+ m_freem(m);
+ return (pass & FR_PASS) ? 0 : -1;
+# else
+ if (pass & FR_DUP)
+ mc = dupmsg(m);
+ if (fr) {
+ frdest_t *fdp = &fr->fr_tif;
+
+ if ((pass & FR_FASTROUTE) ||
+ (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
+ ipfr_fastroute(qif, ip, m, mp, fin, fdp);
+ m = *mp = NULL;
+ }
+ if (mc)
+ ipfr_fastroute(qif, ip, mc, mp, fin, &fr->fr_dif);
+ }
+ return (pass & FR_PASS) ? changed : -1;
+# endif
+#else
+ if (pass & FR_NOMATCH)
+ return 1;
+ if (pass & FR_PASS)
+ return 0;
+ return -1;
+#endif
+}
+
+
+#ifdef IPFILTER_LOG
+# if !(defined(_KERNEL))
+static void ipllog()
+{
+ verbose("l");
+}
+# endif
+
+
+int fr_copytolog(buf, len)
+char *buf;
+int len;
+{
+ int clen, tail;
+
+ tail = (iplh >= iplt) ? (iplbuf + IPLLOGSIZE - iplh) : (iplt - iplh);
+ clen = MIN(tail, len);
+ bcopy(buf, iplh, clen);
+ len -= clen;
+ tail -= clen;
+ iplh += clen;
+ buf += clen;
+ if (iplh == iplbuf + IPLLOGSIZE) {
+ iplh = iplbuf;
+ tail = iplt - iplh;
+ }
+ if (len && tail) {
+ clen = MIN(tail, len);
+ bcopy(buf, iplh, clen);
+ len -= clen;
+ iplh += clen;
+ }
+ return len;
+}
+#endif
diff --git a/sys/netinet/ip_compat.h b/sys/netinet/ip_compat.h
new file mode 100644
index 000000000000..5a36cc318ad6
--- /dev/null
+++ b/sys/netinet/ip_compat.h
@@ -0,0 +1,342 @@
+/*
+ * (C)opyright 1993, 1994, 1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_compat.h 1.8 1/14/96
+ * $Id: ip_compat.h,v 2.0.1.4 1997/02/04 14:24:25 darrenr Exp $
+ */
+
+#ifndef __IP_COMPAT_H_
+#define __IP_COMPAT_H__
+
+#ifndef SOLARIS
+#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+#if SOLARIS
+#define MTYPE(m) ((m)->b_datap->db_type)
+#endif
+#define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
+
+#ifndef IP_OFFMASK
+#define IP_OFFMASK 0x1fff
+#endif
+
+#ifndef MAX
+#define MAX(a,b) (((a) > (b)) ? (a) : (b))
+#endif
+
+/*
+ * Security Options for Intenet Protocol (IPSO) as defined in RFC 1108.
+ *
+ * Basic Option
+ *
+ * 00000001 - (Reserved 4)
+ * 00111101 - Top Secret
+ * 01011010 - Secret
+ * 10010110 - Confidential
+ * 01100110 - (Reserved 3)
+ * 11001100 - (Reserved 2)
+ * 10101011 - Unclassified
+ * 11110001 - (Reserved 1)
+ */
+#define IPSO_CLASS_RES4 0x01
+#define IPSO_CLASS_TOPS 0x3d
+#define IPSO_CLASS_SECR 0x5a
+#define IPSO_CLASS_CONF 0x96
+#define IPSO_CLASS_RES3 0x66
+#define IPSO_CLASS_RES2 0xcc
+#define IPSO_CLASS_UNCL 0xab
+#define IPSO_CLASS_RES1 0xf1
+
+#define IPSO_AUTH_GENSER 0x80
+#define IPSO_AUTH_ESI 0x40
+#define IPSO_AUTH_SCI 0x20
+#define IPSO_AUTH_NSA 0x10
+#define IPSO_AUTH_DOE 0x08
+#define IPSO_AUTH_UN 0x06
+#define IPSO_AUTH_FTE 0x01
+
+/*
+ * IP option #defines
+ */
+/*#define IPOPT_RR 7 */
+#define IPOPT_ZSU 10 /* ZSU */
+#define IPOPT_MTUP 11 /* MTUP */
+#define IPOPT_MTUR 12 /* MTUR */
+#define IPOPT_ENCODE 15 /* ENCODE */
+/*#define IPOPT_TS 68 */
+#define IPOPT_TR 82 /* TR */
+/*#define IPOPT_SECURITY 130 */
+/*#define IPOPT_LSRR 131 */
+#define IPOPT_E_SEC 133 /* E-SEC */
+#define IPOPT_CIPSO 134 /* CIPSO */
+/*#define IPOPT_SATID 136 */
+#ifndef IPOPT_SID
+# define IPOPT_SID IPOPT_SATID
+#endif
+/*#define IPOPT_SSRR 137 */
+#define IPOPT_ADDEXT 147 /* ADDEXT */
+#define IPOPT_VISA 142 /* VISA */
+#define IPOPT_IMITD 144 /* IMITD */
+#define IPOPT_EIP 145 /* EIP */
+#define IPOPT_FINN 205 /* FINN */
+
+
+/*
+ * Build some macros and #defines to enable the same code to compile anywhere
+ * Well, that's the idea, anyway :-)
+ */
+#ifdef _KERNEL
+# if SOLARIS
+# define MUTEX_ENTER(x) mutex_enter(x)
+# define MUTEX_EXIT(x) mutex_exit(x)
+# define MTOD(m,t) (t)((m)->b_rptr)
+# define IRCOPY(a,b,c) copyin((a), (b), (c))
+# define IWCOPY(a,b,c) copyout((a), (b), (c))
+# else
+# define MUTEX_ENTER(x) ;
+# define MUTEX_EXIT(x) ;
+# ifndef linux
+# define MTOD(m,t) mtod(m,t)
+# define IRCOPY(a,b,c) bcopy((a), (b), (c))
+# define IWCOPY(a,b,c) bcopy((a), (b), (c))
+# endif
+# endif /* SOLARIS */
+
+# ifdef sun
+# if defined(__svr4__) || defined(__SVR4)
+# define GETUNIT(n) get_unit((n))
+# else
+# include <sys/kmem_alloc.h>
+# define GETUNIT(n) ifunit((n), IFNAMSIZ)
+# endif
+# else
+# define GETUNIT(n) ifunit((n))
+# endif /* sun */
+
+# if defined(sun) && !defined(linux)
+# define UIOMOVE(a,b,c,d) uiomove(a,b,c,d)
+# define SLEEP(id, n) sleep((id), PZERO+1)
+# define KFREE(x) kmem_free((char *)(x), sizeof(*(x)))
+# if SOLARIS
+typedef struct qif {
+ struct qif *qf_next;
+ ill_t *qf_ill;
+ kmutex_t qf_lock;
+ void *qf_iptr;
+ void *qf_optr;
+ queue_t *qf_in;
+ queue_t *qf_out;
+ void *qf_wqinfo;
+ void *qf_rqinfo;
+ int (*qf_inp)();
+ int (*qf_outp)();
+ mblk_t *qf_m;
+ int qf_len;
+ char qf_name[8];
+ /*
+ * in case the ILL has disappeared...
+ */
+ int qf_hl; /* header length */
+} qif_t;
+# define SPLNET(x) ;
+# undef SPLX
+# define SPLX(x) ;
+# ifdef sparc
+# define ntohs(x) (x)
+# define ntohl(x) (x)
+# define htons(x) (x)
+# define htonl(x) (x)
+# endif
+# define KMALLOC(x) kmem_alloc((x), KM_NOSLEEP)
+# define GET_MINOR(x) getminor(x)
+# else
+# define KMALLOC(x) new_kmem_alloc((x), KMEM_NOSLEEP)
+# endif /* __svr4__ */
+# endif /* sun && !linux */
+# ifndef GET_MINOR
+# define GET_MINOR(x) minor(x)
+# endif
+# if BSD >= 199306 || defined(__FreeBSD__)
+# include <vm/vm.h>
+# if !defined(__FreeBSD__)
+# include <vm/vm_extern.h>
+# include <sys/proc.h>
+extern vm_map_t kmem_map;
+# else
+# include <vm/vm_kern.h>
+# endif /* __FreeBSD__ */
+/*
+** # define KMALLOC(x) kmem_alloc(kmem_map, (x))
+** # define KFREE(x) kmem_free(kmem_map, (vm_offset_t)(x), \
+ sizeof(*(x)))
+*/
+# ifdef M_PFIL
+# define KMALLOC(x) malloc((x), M_PFIL, M_NOWAIT)
+# define KFREE(x) FREE((x), M_PFIL)
+# else
+# define KMALLOC(x) malloc((x), M_TEMP, M_NOWAIT)
+# define KFREE(x) FREE((x), M_TEMP)
+# endif
+# define UIOMOVE(a,b,c,d) uiomove(a,b,d)
+# define SLEEP(id, n) tsleep((id), PPAUSE|PCATCH, n, 0)
+# endif /* BSD */
+# if defined(NetBSD1_0) && (NetBSD1_0 > 1)
+# define SPLNET(x) x = splsoftnet()
+# else
+# if !SOLARIS
+# define SPLNET(x) x = splnet()
+# define SPLX(x) (void) splx(x)
+# endif
+# endif
+#else
+# ifndef linux
+# define MUTEX_ENTER(x) ;
+# define MUTEX_EXIT(x) ;
+# define SPLNET(x) ;
+# define SPLX(x) ;
+# define KMALLOC(x) malloc(x)
+# define KFREE(x) free(x)
+# define GETUNIT(x) (x)
+# define IRCOPY(a,b,c) bcopy((a), (b), (c))
+# define IWCOPY(a,b,c) bcopy((a), (b), (c))
+# endif
+#endif /* KERNEL */
+
+#ifdef linux
+# define ICMP_UNREACH ICMP_DEST_UNREACH
+# define ICMP_SOURCEQUENCH ICMP_SOURCE_QUENCH
+# define ICMP_TIMXCEED ICMP_TIME_EXCEEDED
+# define ICMP_PARAMPROB ICMP_PARAMETERPROB
+
+# define TH_FIN 0x01
+# define TH_SYN 0x02
+# define TH_RST 0x04
+# define TH_PUSH 0x08
+# define TH_ACK 0x10
+# define TH_URG 0x20
+
+typedef struct {
+ __u16 th_sport;
+ __u16 th_dport;
+ __u32 th_seq;
+ __u32 th_ack;
+ __u8 th_x;
+ __u8 th_flags;
+ __u16 th_win;
+ __u16 th_sum;
+ __u16 th_urp;
+} tcphdr_t;
+
+typedef struct {
+ __u16 uh_sport;
+ __u16 uh_dport;
+ __u16 uh_ulen;
+ __u16 uh_sun;
+} udphdr_t;
+
+typedef struct {
+# if defined(__i386__) || defined(__MIPSEL__) || defined(__alpha__) ||\
+ defined(vax)
+ __u8 ip_hl:4;
+ __u8 ip_v:4;
+# else
+ __u8 ip_hl:4;
+ __u8 ip_v:4;
+# endif
+ __u8 ip_tos;
+ __u16 ip_len;
+ __u16 ip_id;
+ __u16 ip_off;
+ __u8 ip_ttl;
+ __u8 ip_p;
+ __u16 ip_sum;
+ struct in_addr ip_src;
+ struct in_addr ip_dst;
+} ip_t;
+
+/*
+ * Structure of an icmp header.
+ */
+struct icmp {
+ u_char icmp_type; /* type of message, see below */
+ u_char icmp_code; /* type sub code */
+ u_short icmp_cksum; /* ones complement cksum of struct */
+ union {
+ u_char ih_pptr; /* ICMP_PARAMPROB */
+ struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
+ struct ih_idseq {
+ n_short icd_id;
+ n_short icd_seq;
+ } ih_idseq;
+ int ih_void;
+ } icmp_hun;
+# define icmp_pptr icmp_hun.ih_pptr
+# define icmp_gwaddr icmp_hun.ih_gwaddr
+# define icmp_id icmp_hun.ih_idseq.icd_id
+# define icmp_seq icmp_hun.ih_idseq.icd_seq
+# define icmp_void icmp_hun.ih_void
+ union {
+ struct id_ts {
+ n_time its_otime;
+ n_time its_rtime;
+ n_time its_ttime;
+ } id_ts;
+ struct id_ip {
+ ip_t idi_ip;
+ /* options and then 64 bits of data */
+ } id_ip;
+ u_long id_mask;
+ char id_data[1];
+ } icmp_dun;
+# define icmp_otime icmp_dun.id_ts.its_otime
+# define icmp_rtime icmp_dun.id_ts.its_rtime
+# define icmp_ttime icmp_dun.id_ts.its_ttime
+# define icmp_ip icmp_dun.id_ip.idi_ip
+# define icmp_mask icmp_dun.id_mask
+# define icmp_data icmp_dun.id_data
+};
+
+struct ipovly {
+ caddr_t ih_next, ih_prev; /* for protocol sequence q's */
+ u_char ih_x1; /* (unused) */
+ u_char ih_pr; /* protocol */
+ short ih_len; /* protocol length */
+ struct in_addr ih_src; /* source internet address */
+ struct in_addr ih_dst; /* destination internet address */
+};
+
+# define SPLX(x) (void)
+# define SPLNET(x) (void)
+
+# define bcopy(a,b,c) memmove(b,a,c)
+# define bcmp(a,b,c) memcmp(a,b,c)
+
+# define UNITNAME(n) dev_get((n))
+# define ifnet device
+
+# define KMALLOC(x) kmalloc((x), GFP_ATOMIC)
+# define KFREE(x) kfree_s((x), sizeof(*(x)))
+# define IRCOPY(a,b,c) { \
+ error = verify_area(VERIFY_READ, \
+ (b) ,sizeof((b))); \
+ if (!error) \
+ memcpy_fromfs((b), (a), (c)); \
+ }
+# define IWCOPY(a,b,c) { \
+ error = verify_area(VERIFY_WRITE, \
+ (b) ,sizeof((b))); \
+ if (!error) \
+ memcpy_tofs((b), (a), (c)); \
+ }
+#else
+typedef struct tcphdr tcphdr_t;
+typedef struct udphdr udphdr_t;
+typedef struct icmp icmphdr_t;
+typedef struct ip ip_t;
+#endif /* linux */
+
+#endif /* __IP_COMPAT_H__ */
diff --git a/sys/netinet/ip_fil.c b/sys/netinet/ip_fil.c
new file mode 100644
index 000000000000..7a244345640e
--- /dev/null
+++ b/sys/netinet/ip_fil.c
@@ -0,0 +1,885 @@
+/*
+ * (C)opyright 1993,1994,1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint) && defined(LIBC_SCCS)
+static char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-1995 Darren Reed";
+static char rcsid[] = "$Id: ip_fil.c,v 2.0.1.5 1997/01/29 13:41:45 darrenr Exp $";
+#endif
+
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/systm.h>
+#include <sys/uio.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#ifdef sun
+#include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include <syslog.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_frag.h"
+#include "ip_nat.h"
+#include "ip_state.h"
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+extern fr_flags, fr_active;
+extern struct protosw inetsw[];
+extern int (*fr_checkp)();
+#if BSD < 199306
+extern int ipfr_slowtimer();
+static int (*fr_saveslowtimo)();
+extern int tcp_ttl;
+#else
+extern void ipfr_slowtimer();
+static void (*fr_saveslowtimo)();
+#endif
+
+int ipl_inited = 0;
+int ipl_unreach = ICMP_UNREACH_FILTER;
+int send_reset();
+
+#ifdef IPFILTER_LOG
+# define LOGSIZE 8192
+int ipllog();
+char iplbuf[LOGSIZE];
+caddr_t iplh = iplbuf, iplt = iplbuf;
+static int iplused = 0;
+#endif /* IPFILTER_LOG */
+static void frflush();
+static int frrequest();
+static int (*fr_savep)();
+
+#if _BSDI_VERSION >= 199501
+# include <sys/device.h>
+# include <sys/conf.h>
+
+int iplioctl __P((dev_t, int, caddr_t, int, struct proc *));
+int iplopen __P((dev_t, int, int, struct proc *));
+int iplclose __P((dev_t, int, int, struct proc *));
+# ifdef IPFILTER_LOG
+int iplread __P((dev_t, struct uio *, int));
+# else
+# define iplread noread
+# endif
+int iplioctl __P((dev_t, int, caddr_t, int, struct proc *));
+
+struct cfdriver iplcd = {
+ NULL, "ipl", NULL, NULL, DV_DULL, 0
+};
+
+struct devsw iplsw = {
+ &iplcd,
+ iplopen, iplclose, iplread, nowrite, iplioctl, noselect, nommap,
+ nostrat, nodump, nopsize, 0,
+ nostop
+};
+#endif /* _BSDI_VERSION >= 199501 */
+
+#ifdef IPFILTER_LKM
+int iplidentify(s)
+char *s;
+{
+ if (strcmp(s, "ipl") == 0)
+ return 1;
+ return 0;
+}
+#endif /* IPFILTER_LKM */
+
+
+int iplattach()
+{
+ int s;
+
+ SPLNET(s);
+ if (ipl_inited || (fr_checkp == fr_check)) {
+ printf("IP Filter: already initialized\n");
+ SPLX(s);
+ return EBUSY;
+ }
+ ipl_inited = 1;
+ bzero((char *)nat_table, sizeof(nat_t *) * NAT_SIZE * 2);
+ fr_savep = fr_checkp;
+ fr_checkp = fr_check;
+ fr_saveslowtimo = inetsw[0].pr_slowtimo;
+ inetsw[0].pr_slowtimo = ipfr_slowtimer;
+ SPLX(s);
+ return 0;
+}
+
+
+int ipldetach()
+{
+ int s, i = FR_INQUE|FR_OUTQUE;
+
+ SPLNET(s);
+ if (!ipl_inited)
+ {
+ printf("IP Filter: not initialized\n");
+ SPLX(s);
+ return EBUSY;
+ }
+
+ fr_checkp = fr_savep;
+ inetsw[0].pr_slowtimo = fr_saveslowtimo;
+ frflush((caddr_t)&i);
+ ipl_inited = 0;
+
+ ipfr_unload();
+ ip_natunload();
+ fr_stateunload();
+
+ SPLX(s);
+ return 0;
+}
+
+
+static void frzerostats(data)
+caddr_t data;
+{
+ struct friostat fio;
+
+ bcopy((char *)frstats, (char *)fio.f_st,
+ sizeof(struct filterstats) * 2);
+ fio.f_fin[0] = ipfilter[0][0];
+ fio.f_fin[1] = ipfilter[0][1];
+ fio.f_fout[0] = ipfilter[1][0];
+ fio.f_fout[1] = ipfilter[1][1];
+ fio.f_acctin[0] = ipacct[0][0];
+ fio.f_acctin[1] = ipacct[0][1];
+ fio.f_acctout[0] = ipacct[1][0];
+ fio.f_acctout[1] = ipacct[1][1];
+ fio.f_active = fr_active;
+ IWCOPY((caddr_t)&fio, data, sizeof(fio));
+ bzero((char *)frstats, sizeof(*frstats) * 2);
+}
+
+
+static void frflush(data)
+caddr_t data;
+{
+ struct frentry *f, **fp;
+ int flags = *(int *)data, flushed = 0, set = fr_active;
+
+ bzero((char *)frcache, sizeof(frcache[0]) * 2);
+
+ if (flags & FR_INACTIVE)
+ set = 1 - set;
+ if (flags & FR_OUTQUE) {
+ for (fp = &ipfilter[1][set]; (f = *fp); ) {
+ *fp = f->fr_next;
+ KFREE(f);
+ flushed++;
+ }
+ for (fp = &ipacct[1][set]; (f = *fp); ) {
+ *fp = f->fr_next;
+ KFREE(f);
+ flushed++;
+ }
+ }
+ if (flags & FR_INQUE) {
+ for (fp = &ipfilter[0][set]; (f = *fp); ) {
+ *fp = f->fr_next;
+ KFREE(f);
+ flushed++;
+ }
+ for (fp = &ipacct[0][set]; (f = *fp); ) {
+ *fp = f->fr_next;
+ KFREE(f);
+ flushed++;
+ }
+ }
+ *(int *)data = flushed;
+}
+
+
+/*
+ * Filter ioctl interface.
+ */
+int iplioctl(dev, cmd, data, mode
+#if _BSDI_VERSION >= 199501
+, p)
+struct proc *p;
+#else
+)
+#endif
+dev_t dev;
+int cmd;
+caddr_t data;
+int mode;
+{
+ int error = 0, s, unit;
+
+ unit = minor(dev);
+ if (unit != 0)
+ return ENXIO;
+
+ SPLNET(s);
+ switch (cmd) {
+ case FIONREAD :
+#ifdef IPFILTER_LOG
+ *(int *)data = iplused;
+#endif
+ break;
+#ifndef IPFILTER_LKM
+ case SIOCFRENB :
+ {
+ u_int enable;
+
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else {
+ IRCOPY(data, (caddr_t)&enable, sizeof(enable));
+ if (enable)
+ error = iplattach();
+ else
+ error = ipldetach();
+ }
+ break;
+ }
+#endif
+ case SIOCSETFF :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else
+ IRCOPY(data, (caddr_t)&fr_flags, sizeof(fr_flags));
+ break;
+ case SIOCGETFF :
+ IWCOPY((caddr_t)&fr_flags, data, sizeof(fr_flags));
+ break;
+ case SIOCINAFR :
+ case SIOCRMAFR :
+ case SIOCADAFR :
+ case SIOCZRLST :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else
+ error = frrequest(cmd, data, fr_active);
+ break;
+ case SIOCINIFR :
+ case SIOCRMIFR :
+ case SIOCADIFR :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else
+ error = frrequest(cmd, data, 1 - fr_active);
+ break;
+ case SIOCSWAPA :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else {
+ bzero((char *)frcache, sizeof(frcache[0]) * 2);
+ *(u_int *)data = fr_active;
+ fr_active = 1 - fr_active;
+ }
+ break;
+ case SIOCGETFS :
+ {
+ struct friostat fio;
+
+ bcopy((char *)frstats, (char *)fio.f_st,
+ sizeof(struct filterstats) * 2);
+ fio.f_fin[0] = ipfilter[0][0];
+ fio.f_fin[1] = ipfilter[0][1];
+ fio.f_fout[0] = ipfilter[1][0];
+ fio.f_fout[1] = ipfilter[1][1];
+ fio.f_acctin[0] = ipacct[0][0];
+ fio.f_acctin[1] = ipacct[0][1];
+ fio.f_acctout[0] = ipacct[1][0];
+ fio.f_acctout[1] = ipacct[1][1];
+ fio.f_active = fr_active;
+ IWCOPY((caddr_t)&fio, data, sizeof(fio));
+ break;
+ }
+ case SIOCFRZST :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else
+ frzerostats(data);
+ break;
+ case SIOCIPFFL :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else
+ frflush(data);
+ break;
+#ifdef IPFILTER_LOG
+ case SIOCIPFFB :
+ if (!(mode & FWRITE))
+ error = EPERM;
+ else {
+ *(int *)data = iplused;
+ iplh = iplt = iplbuf;
+ iplused = 0;
+ }
+ break;
+#endif /* IPFILTER_LOG */
+ case SIOCADNAT :
+ case SIOCRMNAT :
+ case SIOCGNATS :
+ case SIOCGNATL :
+ case SIOCFLNAT :
+ case SIOCCNATL :
+ error = nat_ioctl(data, cmd, mode);
+ break;
+ case SIOCGFRST :
+ IWCOPY((caddr_t)ipfr_fragstats(), data, sizeof(ipfrstat_t));
+ break;
+ case SIOCGIPST :
+ IWCOPY((caddr_t)fr_statetstats(), data, sizeof(ips_stat_t));
+ break;
+ default :
+ error = EINVAL;
+ break;
+ }
+ SPLX(s);
+ return error;
+}
+
+
+static int frrequest(req, data, set)
+int req, set;
+caddr_t data;
+{
+ register frentry_t *fp, *f, **fprev;
+ register frentry_t **ftail;
+ frentry_t fr;
+ frdest_t *fdp;
+ struct frentry frd;
+ int error = 0, in;
+
+ fp = &fr;
+ IRCOPY(data, (caddr_t)fp, sizeof(*fp));
+
+ bzero((char *)frcache, sizeof(frcache[0]) * 2);
+
+ in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
+ if (fp->fr_flags & FR_ACCOUNT) {
+ ftail = fprev = &ipacct[in][set];
+ } else if (fp->fr_flags & (FR_OUTQUE|FR_INQUE))
+ ftail = fprev = &ipfilter[in][set];
+ else
+ return ESRCH;
+
+ IRCOPY((char *)fp, (char *)&frd, sizeof(frd));
+ fp = &frd;
+ if (*fp->fr_ifname) {
+ fp->fr_ifa = GETUNIT(fp->fr_ifname);
+ if (!fp->fr_ifa)
+ fp->fr_ifa = (struct ifnet *)-1;
+ }
+
+ fdp = &fp->fr_dif;
+ fp->fr_flags &= ~FR_DUP;
+ if (*fdp->fd_ifname) {
+ fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
+ if (!fdp->fd_ifp)
+ fdp->fd_ifp = (struct ifnet *)-1;
+ else
+ fp->fr_flags |= FR_DUP;
+ }
+
+ fdp = &fp->fr_tif;
+ if (*fdp->fd_ifname) {
+ fdp->fd_ifp = GETUNIT(fdp->fd_ifname);
+ if (!fdp->fd_ifp)
+ fdp->fd_ifp = (struct ifnet *)-1;
+ }
+
+ /*
+ * Look for a matching filter rule, but don't include the next or
+ * interface pointer in the comparison (fr_next, fr_ifa).
+ */
+ for (; (f = *ftail); ftail = &f->fr_next)
+ if (bcmp((char *)&f->fr_ip, (char *)&fp->fr_ip,
+ FR_CMPSIZ) == 0)
+ break;
+
+ /*
+ * If zero'ing statistics, copy current to caller and zero.
+ */
+ if (req == SIOCZRLST) {
+ if (!f)
+ return ESRCH;
+ IWCOPY((caddr_t)f, data, sizeof(*f));
+ f->fr_hits = 0;
+ f->fr_bytes = 0;
+ return 0;
+ }
+
+ if (!f) {
+ ftail = fprev;
+ if (req != SIOCINAFR && req != SIOCINIFR)
+ while ((f = *ftail))
+ ftail = &f->fr_next;
+ else if (fp->fr_hits)
+ while (--fp->fr_hits && (f = *ftail))
+ ftail = &f->fr_next;
+ f = NULL;
+ }
+
+ if (req == SIOCDELFR || req == SIOCRMIFR) {
+ if (!f)
+ error = ESRCH;
+ else {
+ *ftail = f->fr_next;
+ (void) KFREE(f);
+ }
+ } else {
+ if (f)
+ error = EEXIST;
+ else {
+ if ((f = (struct frentry *)KMALLOC(sizeof(*f)))) {
+ bcopy((char *)fp, (char *)f, sizeof(*f));
+ f->fr_hits = 0;
+ f->fr_next = *ftail;
+ *ftail = f;
+ } else
+ error = ENOMEM;
+ }
+ }
+ return (error);
+}
+
+
+#if !defined(linux)
+/*
+ * routines below for saving IP headers to buffer
+ */
+int iplopen(dev, flags
+#if _BSDI_VERSION >= 199501
+, devtype, p)
+int devtype;
+struct proc *p;
+#else
+)
+#endif
+dev_t dev;
+int flags;
+{
+ u_int min = minor(dev);
+
+ if (min)
+ min = ENXIO;
+ return min;
+}
+
+
+int iplclose(dev, flags
+#if _BSDI_VERSION >= 199501
+, devtype, p)
+int devtype;
+struct proc *p;
+#else
+)
+#endif
+dev_t dev;
+int flags;
+{
+ u_int min = minor(dev);
+
+ if (min)
+ min = ENXIO;
+ return min;
+}
+
+# ifdef IPFILTER_LOG
+/*
+ * iplread/ipllog
+ * both of these must operate with at least splnet() lest they be
+ * called during packet processing and cause an inconsistancy to appear in
+ * the filter lists.
+ */
+# if BSD >= 199306
+int iplread(dev, uio, ioflag)
+int ioflag;
+# else
+int iplread(dev, uio)
+# endif
+dev_t dev;
+register struct uio *uio;
+{
+ register int ret, s;
+ register size_t sz, sx;
+ int error;
+
+ if (!uio->uio_resid)
+ return 0;
+ while (!iplused) {
+ error = SLEEP(iplbuf, "ipl sleep");
+ if (error)
+ return error;
+ }
+ SPLNET(s);
+
+ sx = sz = MIN(uio->uio_resid, iplused);
+ if (iplh < iplt)
+ sz = MIN(sz, LOGSIZE - (iplt - iplbuf));
+ sx -= sz;
+
+# if BSD >= 199306 || defined(__FreeBSD__)
+ uio->uio_rw = UIO_READ;
+# endif
+ if (!(ret = UIOMOVE(iplt, sz, UIO_READ, uio))) {
+ iplt += sz;
+ iplused -= sz;
+ if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
+ iplt = iplbuf;
+
+ if (sx && !(ret = UIOMOVE(iplt, sx, UIO_READ, uio))) {
+ iplt += sx;
+ iplused -= sx;
+ if ((iplh < iplt) && (iplt == iplbuf + LOGSIZE))
+ iplt = iplbuf;
+ }
+ if (!iplused) /* minimise wrapping around the end */
+ iplh = iplt = iplbuf;
+ }
+ SPLX(s);
+ return ret;
+}
+# endif /* IPFILTER_LOG */
+#endif /* linux */
+
+
+#ifdef IPFILTER_LOG
+int ipllog(flags, ip, fin, m)
+u_int flags;
+ip_t *ip;
+register fr_info_t *fin;
+struct mbuf *m;
+{
+ struct ipl_ci iplci;
+ register int len, mlen, hlen;
+ struct ifnet *ifp = fin->fin_ifp;
+
+ hlen = fin->fin_hlen;
+ if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)
+ hlen += MIN(sizeof(tcphdr_t), fin->fin_dlen);
+ else if (ip->ip_p == IPPROTO_ICMP) {
+ struct icmp *icmp = (struct icmp *)((char *)ip + hlen);
+
+ switch (icmp->icmp_type) {
+ case ICMP_UNREACH :
+ case ICMP_SOURCEQUENCH :
+ case ICMP_REDIRECT :
+ case ICMP_TIMXCEED :
+ case ICMP_PARAMPROB :
+ hlen += MIN(sizeof(struct icmp) + 8, fin->fin_dlen);
+ break;
+ default :
+ hlen += MIN(sizeof(struct icmp), fin->fin_dlen);
+ break;
+ }
+ }
+
+ mlen = (flags & FR_LOGBODY) ? MIN(ip->ip_len - hlen, 128) : 0;
+ len = hlen + sizeof(iplci) + mlen;
+ if (iplused + len > LOGSIZE)
+ return 0;
+ iplused += len;
+
+# ifdef sun
+ uniqtime(&iplci);
+# endif
+# if BSD >= 199306 || defined(__FreeBSD__)
+ microtime((struct timeval *)&iplci);
+# endif
+ iplci.flags = flags;
+ iplci.hlen = (u_char)hlen;
+ iplci.plen = (u_char)mlen;
+ iplci.rule = fin->fin_rule;
+# if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603))
+ strncpy(iplci.ifname, ifp->if_xname, IFNAMSIZ);
+# else
+ iplci.unit = (u_char)ifp->if_unit;
+ if ((iplci.ifname[0] = ifp->if_name[0]))
+ if ((iplci.ifname[1] = ifp->if_name[1]))
+ if ((iplci.ifname[2] = ifp->if_name[2]))
+ iplci.ifname[3] = ifp->if_name[3];
+# endif
+ /*
+ * Gauranteed to succeed from above
+ */
+ (void) fr_copytolog(&iplci, sizeof(iplci));
+
+ for (len -= sizeof(iplci); m && len > 0; m = m->m_next, len -= hlen) {
+ hlen = MIN(len, m->m_len);
+ if (fr_copytolog(mtod(m, char *), hlen))
+ break;
+ }
+
+ wakeup(iplbuf);
+ return 1;
+}
+#endif /* IPFILTER_LOG */
+
+/*
+ * send_reset - this could conceivably be a call to tcp_respond(), but that
+ * requires a large amount of setting up and isn't any more efficient.
+ */
+int send_reset(ti)
+struct tcpiphdr *ti;
+{
+ struct tcpiphdr *tp;
+ struct ip *ip;
+ struct tcphdr *tcp;
+ struct mbuf *m;
+ int tlen = 0;
+
+ if (ti->ti_flags & TH_RST)
+ return -1; /* feedback loop */
+#if BSD < 199306
+ m = m_get(M_DONTWAIT, MT_HEADER);
+#else
+ m = m_gethdr(M_DONTWAIT, MT_HEADER);
+ m->m_data += max_linkhdr;
+#endif
+ if (m == NULL)
+ return -1;
+
+ if (ti->ti_flags & TH_SYN)
+ tlen = 1;
+ m->m_len = sizeof (struct tcpiphdr);
+#if BSD >= 199306
+ m->m_pkthdr.len = sizeof (struct tcpiphdr);
+ m->m_pkthdr.rcvif = (struct ifnet *)0;
+#endif
+ bzero(mtod(m, char *), sizeof(struct tcpiphdr));
+ ip = mtod(m, struct ip *);
+ tp = mtod(m, struct tcpiphdr *);
+ tcp = (struct tcphdr *)((char *)ip + sizeof(struct ip));
+
+ ip->ip_src.s_addr = ti->ti_dst.s_addr;
+ ip->ip_dst.s_addr = ti->ti_src.s_addr;
+ tcp->th_dport = ti->ti_sport;
+ tcp->th_sport = ti->ti_dport;
+ tcp->th_ack = htonl(ntohl(ti->ti_seq) + tlen);
+ tcp->th_off = sizeof(struct tcphdr) >> 2;
+ tcp->th_flags = TH_RST|TH_ACK;
+ tp->ti_pr = ((struct ip *)ti)->ip_p;
+ tp->ti_len = htons(sizeof(struct tcphdr));
+ tcp->th_sum = in_cksum(m, sizeof(struct tcpiphdr));
+
+ ip->ip_tos = ((struct ip *)ti)->ip_tos;
+ ip->ip_p = ((struct ip *)ti)->ip_p;
+ ip->ip_len = sizeof (struct tcpiphdr);
+#if BSD < 199306
+ ip->ip_ttl = tcp_ttl;
+#else
+ ip->ip_ttl = ip_defttl;
+#endif
+
+ /*
+ * extra 0 in case of multicast
+ */
+ (void) ip_output(m, (struct mbuf *)0, 0, 0, 0);
+ return 0;
+}
+
+
+#ifndef IPFILTER_LKM
+void iplinit()
+{
+ (void) iplattach();
+ ip_init();
+}
+#endif
+
+
+void ipfr_fastroute(m0, fin, fdp)
+struct mbuf *m0;
+fr_info_t *fin;
+frdest_t *fdp;
+{
+ register struct ip *ip, *mhip;
+ register struct mbuf *m = m0;
+ register struct route *ro;
+ struct ifnet *ifp = fdp->fd_ifp;
+ int len, off, error = 0;
+ int hlen = fin->fin_hlen;
+ struct route iproute;
+ struct sockaddr_in *dst;
+
+ ip = mtod(m0, struct ip *);
+ /*
+ * Route packet.
+ */
+ ro = &iproute;
+ bzero((caddr_t)ro, sizeof (*ro));
+ dst = (struct sockaddr_in *)&ro->ro_dst;
+ dst->sin_family = AF_INET;
+ dst->sin_addr = fdp->fd_ip.s_addr ? fdp->fd_ip : ip->ip_dst;
+#if (BSD >= 199306) && !defined(__NetBSD__) && !defined(__bsdi__)
+# ifdef RTF_CLONING
+ rtalloc_ign(ro, RTF_CLONING);
+# else
+ rtalloc_ign(ro, RTF_PRCLONING);
+# endif
+#else
+ rtalloc(ro);
+#endif
+ if (!ifp) {
+ if (!(fin->fin_fr->fr_flags & FR_FASTROUTE)) {
+ error = -2;
+ goto bad;
+ }
+ if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
+ if (in_localaddr(ip->ip_dst))
+ error = EHOSTUNREACH;
+ else
+ error = ENETUNREACH;
+ goto bad;
+ }
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = (struct sockaddr_in *)&ro->ro_rt->rt_gateway;
+ }
+ ro->ro_rt->rt_use++;
+
+ /*
+ * For input packets which are being "fastrouted", they won't
+ * go back through output filtering and miss their chance to get
+ * NAT'd.
+ */
+ (void) ip_natout(ip, hlen, fin);
+ if (fin->fin_out)
+ ip->ip_sum = 0;
+ /*
+ * If small enough for interface, can just send directly.
+ */
+ if (ip->ip_len <= ifp->if_mtu) {
+#ifndef sparc
+ ip->ip_id = htons(ip->ip_id);
+ ip->ip_len = htons(ip->ip_len);
+ ip->ip_off = htons(ip->ip_off);
+#endif
+ if (!ip->ip_sum)
+ ip->ip_sum = in_cksum(m, hlen);
+#if BSD >= 199306
+ error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst,
+ ro->ro_rt);
+
+#else
+ error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst);
+#endif
+ goto done;
+ }
+ /*
+ * Too large for interface; fragment if possible.
+ * Must be able to put at least 8 bytes per fragment.
+ */
+ if (ip->ip_off & IP_DF) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+ len = (ifp->if_mtu - hlen) &~ 7;
+ if (len < 8) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+
+ {
+ int mhlen, firstlen = len;
+ struct mbuf **mnext = &m->m_act;
+
+ /*
+ * Loop through length of segment after first fragment,
+ * make new header and copy data of each part and link onto chain.
+ */
+ m0 = m;
+ mhlen = sizeof (struct ip);
+ for (off = hlen + len; off < ip->ip_len; off += len) {
+ MGET(m, M_DONTWAIT, MT_HEADER);
+ if (m == 0) {
+ error = ENOBUFS;
+ goto bad;
+ }
+#if BSD >= 199306
+ m->m_data += max_linkhdr;
+#else
+ m->m_off = MMAXOFF - hlen;
+#endif
+ mhip = mtod(m, struct ip *);
+ bcopy((char *)ip, (char *)mhip, sizeof(*ip));
+ if (hlen > sizeof (struct ip)) {
+ mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
+ mhip->ip_hl = mhlen >> 2;
+ }
+ m->m_len = mhlen;
+ mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF);
+ if (ip->ip_off & IP_MF)
+ mhip->ip_off |= IP_MF;
+ if (off + len >= ip->ip_len)
+ len = ip->ip_len - off;
+ else
+ mhip->ip_off |= IP_MF;
+ mhip->ip_len = htons((u_short)(len + mhlen));
+ m->m_next = m_copy(m0, off, len);
+ if (m->m_next == 0) {
+ error = ENOBUFS; /* ??? */
+ goto sendorfree;
+ }
+#ifndef sparc
+ mhip->ip_off = htons((u_short)mhip->ip_off);
+#endif
+ mhip->ip_sum = 0;
+ mhip->ip_sum = in_cksum(m, mhlen);
+ *mnext = m;
+ mnext = &m->m_act;
+ }
+ /*
+ * Update first fragment by trimming what's been copied out
+ * and updating header, then send each fragment (in order).
+ */
+ m_adj(m0, hlen + firstlen - ip->ip_len);
+ ip->ip_len = htons((u_short)(hlen + firstlen));
+ ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
+ ip->ip_sum = 0;
+ ip->ip_sum = in_cksum(m0, hlen);
+sendorfree:
+ for (m = m0; m; m = m0) {
+ m0 = m->m_act;
+ m->m_act = 0;
+ if (error == 0)
+#if BSD >= 199306
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst, ro->ro_rt);
+#else
+ error = (*ifp->if_output)(ifp, m,
+ (struct sockaddr *)dst);
+#endif
+ else
+ m_freem(m);
+ }
+ }
+done:
+ if (ro->ro_rt) {
+ RTFREE(ro->ro_rt);
+ }
+ return;
+bad:
+ m_freem(m);
+ goto done;
+}
diff --git a/sys/netinet/ip_fil.h b/sys/netinet/ip_fil.h
new file mode 100644
index 000000000000..389a161bc2df
--- /dev/null
+++ b/sys/netinet/ip_fil.h
@@ -0,0 +1,293 @@
+/*
+ * (C)opyright 1993-1996 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_fil.h 1.35 6/5/96
+ * $Id: ip_fil.h,v 2.0.1.2 1997/01/10 00:28:15 darrenr Exp $
+ */
+
+#ifndef __IP_FIL_H__
+#define __IP_FIL_H__
+
+#ifndef SOLARIS
+#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(KERNEL) && !defined(_KERNEL)
+#define _KERNEL
+#endif
+#if SOLARIS
+# include <sys/ioccom.h>
+# include <sys/sysmacros.h>
+# ifdef _KERNEL
+# include <inet/common.h>
+/*
+ * because Solaris 2 defines these in two places :-/
+ */
+#undef IPOPT_EOL
+#undef IPOPT_NOP
+#undef IPOPT_LSRR
+#undef IPOPT_RR
+#undef IPOPT_SSRR
+# include <inet/ip.h>
+# endif
+#endif
+
+#if defined(__STDC__) || defined(__GNUC__)
+#define SIOCADAFR _IOW('r', 60, struct frentry)
+#define SIOCRMAFR _IOW('r', 61, struct frentry)
+#define SIOCSETFF _IOW('r', 62, u_int)
+#define SIOCGETFF _IOR('r', 63, u_int)
+#define SIOCGETFS _IOR('r', 64, struct friostat)
+#define SIOCIPFFL _IOWR('r', 65, int)
+#define SIOCIPFFB _IOR('r', 66, int)
+#define SIOCADIFR _IOW('r', 67, struct frentry)
+#define SIOCRMIFR _IOW('r', 68, struct frentry)
+#define SIOCSWAPA _IOR('r', 69, u_int)
+#define SIOCINAFR _IOW('r', 70, struct frentry)
+#define SIOCINIFR _IOW('r', 71, struct frentry)
+#define SIOCFRENB _IOW('r', 72, u_int)
+#define SIOCFRSYN _IOW('r', 73, u_int)
+#define SIOCFRZST _IOWR('r', 74, struct friostat)
+#define SIOCZRLST _IOWR('r', 75, struct frentry)
+#else
+#define SIOCADAFR _IOW(r, 60, struct frentry)
+#define SIOCRMAFR _IOW(r, 61, struct frentry)
+#define SIOCSETFF _IOW(r, 62, u_int)
+#define SIOCGETFF _IOR(r, 63, u_int)
+#define SIOCGETFS _IOR(r, 64, struct friostat)
+#define SIOCIPFFL _IOWR(r, 65, int)
+#define SIOCIPFFB _IOR(r, 66, int)
+#define SIOCADIFR _IOW(r, 67, struct frentry)
+#define SIOCRMIFR _IOW(r, 68, struct frentry)
+#define SIOCSWAPA _IOR(r, 69, u_int)
+#define SIOCINAFR _IOW(r, 70, struct frentry)
+#define SIOCINIFR _IOW(r, 71, struct frentry)
+#define SIOCFRENB _IOW(r, 72, u_int)
+#define SIOCFRSYN _IOW(r, 73, u_int)
+#define SIOCFRZST _IOWR(r, 74, struct friostat)
+#define SIOCZRLST _IOWR(r, 75, struct frentry)
+#endif
+#define SIOCADDFR SIOCADAFR
+#define SIOCDELFR SIOCRMAFR
+#define SIOCINSFR SIOCINAFR
+
+typedef struct fr_ip {
+ u_char fi_v:4; /* IP version */
+ u_char fi_fl:4; /* packet flags */
+ u_char fi_tos;
+ u_char fi_ttl;
+ u_char fi_p;
+ struct in_addr fi_src;
+ struct in_addr fi_dst;
+ u_long fi_optmsk; /* bitmask composed from IP options */
+ u_short fi_secmsk; /* bitmask composed from IP security options */
+ u_short fi_auth;
+} fr_ip_t;
+
+#define FI_OPTIONS 0x01
+#define FI_TCPUDP 0x02 /* TCP/UCP implied comparison involved */
+#define FI_FRAG 0x04
+#define FI_SHORT 0x08
+
+typedef struct fr_info {
+ struct fr_ip fin_fi;
+ void *fin_ifp;
+ u_short fin_data[2];
+ u_short fin_out;
+ u_char fin_tcpf;
+ u_char fin_icode;
+ u_short fin_rule;
+ u_short fin_hlen;
+ u_short fin_dlen;
+ char *fin_dp; /* start of data past IP header */
+ struct frentry *fin_fr;
+} fr_info_t;
+
+#define FI_CSIZE (sizeof(struct fr_ip) + 11)
+
+typedef struct frdest {
+ void *fd_ifp;
+ struct in_addr fd_ip;
+ char fd_ifname[IFNAMSIZ];
+} frdest_t;
+
+typedef struct frentry {
+ struct frentry *fr_next;
+ struct ifnet *fr_ifa;
+ u_long fr_hits;
+ u_long fr_bytes; /* this is only incremented when a packet */
+ /* matches this rule and it is the last match*/
+ /*
+ * Fields after this may not change whilst in the kernel.
+ */
+ struct fr_ip fr_ip;
+ struct fr_ip fr_mip; /* mask structure */
+
+ u_char fr_tcpfm; /* tcp flags mask */
+ u_char fr_tcpf; /* tcp flags */
+
+ u_short fr_icmpm; /* data for ICMP packets (mask) */
+ u_short fr_icmp;
+
+ u_char fr_scmp; /* data for port comparisons */
+ u_char fr_dcmp;
+ u_short fr_dport;
+ u_short fr_sport;
+ u_short fr_stop; /* top port for <> and >< */
+ u_short fr_dtop; /* top port for <> and >< */
+ u_long fr_flags; /* per-rule flags && options (see below) */
+ int (*fr_func)(); /* call this function */
+ char fr_icode; /* return ICMP code */
+ char fr_ifname[IFNAMSIZ];
+ struct frdest fr_tif; /* "to" interface */
+ struct frdest fr_dif; /* duplicate packet interfaces */
+} frentry_t;
+
+#define fr_proto fr_ip.fi_p
+#define fr_ttl fr_ip.fi_ttl
+#define fr_tos fr_ip.fi_tos
+#define fr_dst fr_ip.fi_dst
+#define fr_src fr_ip.fi_src
+#define fr_dmsk fr_mip.fi_dst
+#define fr_smsk fr_mip.fi_src
+
+#ifndef offsetof
+#define offsetof(t,m) (int)((&((t *)0L)->m))
+#endif
+#define FR_CMPSIZ (sizeof(struct frentry) - offsetof(frentry_t, fr_ip))
+
+/*
+ * fr_flags
+*/
+#define FR_BLOCK 0x00001
+#define FR_PASS 0x00002
+#define FR_OUTQUE 0x00004
+#define FR_INQUE 0x00008
+#define FR_LOG 0x00010 /* Log */
+#define FR_LOGB 0x00011 /* Log-fail */
+#define FR_LOGP 0x00012 /* Log-pass */
+#define FR_LOGBODY 0x00020 /* Log the body */
+#define FR_LOGFIRST 0x00040 /* Log the first byte if state held */
+#define FR_RETRST 0x00080 /* Return TCP RST packet - reset connection */
+#define FR_RETICMP 0x00100 /* Return ICMP unreachable packet */
+#define FR_NOMATCH 0x00200
+#define FR_ACCOUNT 0x00400 /* count packet bytes */
+#define FR_KEEPFRAG 0x00800 /* keep fragment information */
+#define FR_KEEPSTATE 0x01000 /* keep `connection' state information */
+#define FR_INACTIVE 0x02000
+#define FR_QUICK 0x04000 /* match & stop processing list */
+#define FR_FASTROUTE 0x08000 /* bypass normal routing */
+#define FR_CALLNOW 0x10000 /* call another function (fr_func) if matches */
+#define FR_DUP 0x20000 /* duplicate packet */
+#define FR_LOGORBLOCK 0x40000 /* block the packet if it can't be logged */
+
+#define FR_LOGMASK (FR_LOG|FR_LOGP|FR_LOGB)
+/*
+ * recognized flags for SIOCGETFF and SIOCSETFF
+ */
+#define FF_LOGPASS 0x100000
+#define FF_LOGBLOCK 0x200000
+#define FF_LOGNOMATCH 0x400000
+#define FF_LOGGING (FF_LOGPASS|FF_LOGBLOCK|FF_LOGNOMATCH)
+#define FF_BLOCKNONIP 0x800000 /* Solaris2 Only */
+
+#define FR_NONE 0
+#define FR_EQUAL 1
+#define FR_NEQUAL 2
+#define FR_LESST 3
+#define FR_GREATERT 4
+#define FR_LESSTE 5
+#define FR_GREATERTE 6
+#define FR_OUTRANGE 7
+#define FR_INRANGE 8
+
+typedef struct filterstats {
+ u_long fr_pass; /* packets allowed */
+ u_long fr_block; /* packets denied */
+ u_long fr_nom; /* packets which don't match any rule */
+ u_long fr_ppkl; /* packets allowed and logged */
+ u_long fr_bpkl; /* packets denied and logged */
+ u_long fr_npkl; /* packets unmatched and logged */
+ u_long fr_pkl; /* packets logged */
+ u_long fr_skip; /* packets to be logged but buffer full */
+ u_long fr_ret; /* packets for which a return is sent */
+ u_long fr_acct; /* packets for which counting was performed */
+ u_long fr_bnfr; /* bad attempts to allocate fragment state */
+ u_long fr_nfr; /* new fragment state kept */
+ u_long fr_cfr; /* add new fragment state but complete pkt */
+ u_long fr_bads; /* bad attempts to allocate packet state */
+ u_long fr_ads; /* new packet state kept */
+ u_long fr_chit; /* cached hit */
+ u_long fr_pull[2]; /* good and bad pullup attempts */
+#if SOLARIS
+ u_long fr_bad; /* bad IP packets to the filter */
+ u_long fr_notip; /* packets passed through no on ip queue */
+ u_long fr_drop; /* packets dropped - no info for them! */
+#endif
+} filterstats_t;
+
+/*
+ * For SIOCGETFS
+ */
+typedef struct friostat {
+ struct filterstats f_st[2];
+ struct frentry *f_fin[2];
+ struct frentry *f_fout[2];
+ struct frentry *f_acctin[2];
+ struct frentry *f_acctout[2];
+ int f_active;
+} friostat_t;
+
+typedef struct optlist {
+ u_short ol_val;
+ int ol_bit;
+} optlist_t;
+
+/*
+ * Log structure. Each packet header logged is prepended by one of these,
+ * minimize size to make most effective use of log space which should
+ * (ideally) be a muliple of the most common log entry size.
+ */
+typedef struct ipl_ci {
+ u_long sec;
+ u_long usec;
+ u_char hlen;
+ u_char plen;
+ u_short rule; /* assume never more than 64k rules, total */
+#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603))
+ u_long flags;
+ u_char ifname[IFNAMSIZ]; /* = 32 bytes */
+#else
+ u_long flags:24;
+ u_long unit:8;
+ u_char ifname[4]; /* = 20 bytes */
+#endif
+} ipl_ci_t;
+
+
+#ifndef ICMP_UNREACH_FILTER
+#define ICMP_UNREACH_FILTER 13
+#endif
+
+#define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h)))
+#define IPLLOGSIZE 8192
+
+extern int fr_check();
+extern int fr_copytolog();
+extern fr_info_t frcache[];
+extern char *iplh, *iplt;
+extern char iplbuf[IPLLOGSIZE];
+
+#ifdef _KERNEL
+
+extern struct frentry *ipfilter[2][2], *ipacct[2][2];
+extern struct filterstats frstats[];
+# if SOLARIS
+extern int ipfsync();
+# endif
+#endif /* _KERNEL */
+#endif /* __IP_FIL_H__ */
diff --git a/sys/netinet/ip_frag.c b/sys/netinet/ip_frag.c
new file mode 100644
index 000000000000..6665404b9830
--- /dev/null
+++ b/sys/netinet/ip_frag.c
@@ -0,0 +1,278 @@
+/*
+ * (C)opyright 1993,1994,1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint) && defined(LIBC_SCCS)
+static char sccsid[] = "@(#)ip_frag.c 1.11 3/24/96 (C) 1993-1995 Darren Reed";
+static char rcsid[] = "$Id: ip_frag.c,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $";
+#endif
+
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <string.h>
+# include <stdlib.h>
+#endif
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#ifdef _KERNEL
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+#else
+# include <sys/byteorder.h>
+# include <sys/dditypes.h>
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+
+#include <net/if.h>
+#ifdef sun
+#include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_frag.h"
+#include "ip_nat.h"
+#include "ip_state.h"
+
+ipfr_t *ipfr_heads[IPFT_SIZE];
+ipfrstat_t ipfr_stats;
+u_long ipfr_inuse = 0,
+ fr_ipfrttl = 120; /* 60 seconds */
+#ifdef _KERNEL
+extern int ipfr_timer_id;
+#endif
+#if SOLARIS
+# ifdef _KERNEL
+extern kmutex_t ipf_frag;
+# else
+#define bcmp(a,b,c) memcmp(a,b,c)
+#define bcopy(a,b,c) memmove(b,a,c)
+# endif
+#endif
+
+
+ipfrstat_t *ipfr_fragstats()
+{
+ ipfr_stats.ifs_table = ipfr_heads;
+ ipfr_stats.ifs_inuse = ipfr_inuse;
+ return &ipfr_stats;
+}
+
+
+/*
+ * add a new entry to the fragment cache, registering it as having come
+ * through this box, with the result of the filter operation.
+ */
+int ipfr_newfrag(ip, fin, pass)
+ip_t *ip;
+fr_info_t *fin;
+int pass;
+{
+ ipfr_t **fp, *fr, frag;
+ u_int idx;
+
+ frag.ipfr_p = ip->ip_p;
+ idx = ip->ip_p;
+ frag.ipfr_id = ip->ip_id;
+ idx += ip->ip_id;
+ frag.ipfr_tos = ip->ip_tos;
+ frag.ipfr_src.s_addr = ip->ip_src.s_addr;
+ idx += ip->ip_src.s_addr;
+ frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
+ idx += ip->ip_dst.s_addr;
+ idx *= 127;
+ idx %= IPFT_SIZE;
+
+ /*
+ * first, make sure it isn't already there...
+ */
+ MUTEX_ENTER(&ipf_frag);
+ for (fp = &ipfr_heads[idx]; (fr = *fp); fp = &fr->ipfr_next)
+ if (!bcmp((char *)&frag.ipfr_src, (char *)&fr->ipfr_src,
+ IPFR_CMPSZ)) {
+ ipfr_stats.ifs_exists++;
+ MUTEX_EXIT(&ipf_frag);
+ return -1;
+ }
+
+ if (!(fr = (ipfr_t *)KMALLOC(sizeof(*fr)))) {
+ ipfr_stats.ifs_nomem++;
+ MUTEX_EXIT(&ipf_frag);
+ return -1;
+ }
+ if ((fr->ipfr_next = ipfr_heads[idx]))
+ ipfr_heads[idx]->ipfr_prev = fr;
+ fr->ipfr_prev = NULL;
+ ipfr_heads[idx] = fr;
+ bcopy((char *)&frag.ipfr_src, (char *)&fr->ipfr_src, IPFR_CMPSZ);
+ fr->ipfr_ttl = fr_ipfrttl;
+ fr->ipfr_pass = pass & ~(FR_LOGFIRST|FR_LOG);
+ fr->ipfr_off = (ip->ip_off & 0x1fff) + (fin->fin_dlen >> 3);
+ *fp = fr;
+ ipfr_stats.ifs_new++;
+ ipfr_inuse++;
+ MUTEX_EXIT(&ipf_frag);
+ return 0;
+}
+
+
+/*
+ * check the fragment cache to see if there is already a record of this packet
+ * with its filter result known.
+ */
+int ipfr_knownfrag(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+ ipfr_t *f, frag;
+ u_int idx;
+ int ret;
+
+ /*
+ * For fragments, we record protocol, packet id, TOS and both IP#'s
+ * (these should all be the same for all fragments of a packet).
+ */
+ frag.ipfr_p = ip->ip_p;
+ idx = ip->ip_p;
+ frag.ipfr_id = ip->ip_id;
+ idx += ip->ip_id;
+ frag.ipfr_tos = ip->ip_tos;
+ frag.ipfr_src.s_addr = ip->ip_src.s_addr;
+ idx += ip->ip_src.s_addr;
+ frag.ipfr_dst.s_addr = ip->ip_dst.s_addr;
+ idx += ip->ip_dst.s_addr;
+ idx *= 127;
+ idx %= IPFT_SIZE;
+
+ MUTEX_ENTER(&ipf_frag);
+ for (f = ipfr_heads[idx]; f; f = f->ipfr_next)
+ if (!bcmp((char *)&frag.ipfr_src, (char *)&f->ipfr_src,
+ IPFR_CMPSZ)) {
+ u_short atoff, off;
+
+ if (f != ipfr_heads[idx]) {
+ /*
+ * move fragment info. to the top of the list
+ * to speed up searches.
+ */
+ if ((f->ipfr_prev->ipfr_next = f->ipfr_next))
+ f->ipfr_next->ipfr_prev = f->ipfr_prev;
+ f->ipfr_next = ipfr_heads[idx];
+ ipfr_heads[idx]->ipfr_prev = f;
+ f->ipfr_prev = NULL;
+ ipfr_heads[idx] = f;
+ }
+ ret = f->ipfr_pass;
+ off = ip->ip_off;
+ atoff = (off & 0x1fff) - (fin->fin_dlen >> 3);
+ /*
+ * If we've follwed the fragments, and this is the
+ * last (in order), shrink expiration time.
+ */
+ if (atoff == f->ipfr_off) {
+ if (!(off & IP_MF))
+ f->ipfr_ttl = 1;
+ else
+ f->ipfr_off = off;
+ }
+ ipfr_stats.ifs_hits++;
+ MUTEX_EXIT(&ipf_frag);
+ return ret;
+ }
+ MUTEX_EXIT(&ipf_frag);
+ return 0;
+}
+
+
+/*
+ * Free memory in use by fragment state info. kept.
+ */
+void ipfr_unload()
+{
+ ipfr_t **fp, *fr;
+ int idx;
+#if !SOLARIS && defined(_KERNEL)
+ int s;
+#endif
+
+ MUTEX_ENTER(&ipf_frag);
+ SPLNET(s);
+ for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+ for (fp = &ipfr_heads[idx]; (fr = *fp); ) {
+ *fp = fr->ipfr_next;
+ KFREE(fr);
+ }
+ SPLX(s);
+ MUTEX_EXIT(&ipf_frag);
+}
+
+
+#ifdef _KERNEL
+/*
+ * Slowly expire held state for fragments. Timeouts are set * in expectation
+ * of this being called twice per second.
+ */
+# if BSD < 199306
+int ipfr_slowtimer()
+# else
+void ipfr_slowtimer()
+# endif
+{
+ ipfr_t **fp, *fr;
+ int s, idx;
+
+ MUTEX_ENTER(&ipf_frag);
+ SPLNET(s);
+
+ for (idx = IPFT_SIZE - 1; idx >= 0; idx--)
+ for (fp = &ipfr_heads[idx]; (fr = *fp); ) {
+ --fr->ipfr_ttl;
+ if (fr->ipfr_ttl == 0) {
+ if (fr->ipfr_prev)
+ fr->ipfr_prev->ipfr_next =
+ fr->ipfr_next;
+ if (fr->ipfr_next)
+ fr->ipfr_next->ipfr_prev =
+ fr->ipfr_prev;
+ *fp = fr->ipfr_next;
+ ipfr_stats.ifs_expire++;
+ ipfr_inuse--;
+ KFREE(fr);
+ } else
+ fp = &fr->ipfr_next;
+ }
+ SPLX(s);
+# if SOLARIS
+ MUTEX_EXIT(&ipf_frag);
+ fr_timeoutstate();
+ ip_natexpire();
+ ipfr_timer_id = timeout(ipfr_slowtimer, NULL, HZ/2);
+# else
+ fr_timeoutstate();
+ ip_natexpire();
+ ip_slowtimo();
+# if BSD < 199306
+ return 0;
+# endif
+# endif
+}
+#endif /* defined(_KERNEL) */
diff --git a/sys/netinet/ip_frag.h b/sys/netinet/ip_frag.h
new file mode 100644
index 000000000000..a356785e528c
--- /dev/null
+++ b/sys/netinet/ip_frag.h
@@ -0,0 +1,47 @@
+/*
+ * (C)opyright 1993, 1994, 1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_frag.h 1.5 3/24/96
+ * $Id: ip_frag.h,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $
+ */
+
+#ifndef __IP_FRAG_H_
+#define __IP_FRAG_H__
+
+#define IPFT_SIZE 257
+
+typedef struct ipfr {
+ struct ipfr *ipfr_next, *ipfr_prev;
+ struct in_addr ipfr_src;
+ struct in_addr ipfr_dst;
+ u_short ipfr_id;
+ u_char ipfr_p;
+ u_char ipfr_tos;
+ u_short ipfr_off;
+ u_short ipfr_ttl;
+ u_char ipfr_pass;
+} ipfr_t;
+
+
+typedef struct ipfrstat {
+ u_long ifs_exists; /* add & already exists */
+ u_long ifs_nomem;
+ u_long ifs_new;
+ u_long ifs_hits;
+ u_long ifs_expire;
+ u_long ifs_inuse;
+ struct ipfr **ifs_table;
+} ipfrstat_t;
+
+#define IPFR_CMPSZ (4 + 4 + 2 + 1 + 1)
+
+extern ipfrstat_t *ipfr_fragstats();
+extern int ipfr_newfrag(), ipfr_knownfrag();
+# ifdef _KERNEL
+extern void ipfr_unload();
+# endif
+#endif /* __IP_FIL_H__ */
diff --git a/sys/netinet/ip_nat.c b/sys/netinet/ip_nat.c
new file mode 100644
index 000000000000..afe9761bc093
--- /dev/null
+++ b/sys/netinet/ip_nat.c
@@ -0,0 +1,886 @@
+/*
+ * (C)opyright 1995-1996 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * Added redirect stuff and a LOT of bug fixes. (mcn@EnGarde.com)
+ */
+#if !defined(lint) && defined(LIBC_SCCS)
+static char sccsid[] = "@(#)ip_nat.c 1.11 6/5/96 (C) 1995 Darren Reed";
+static char rcsid[] = "$Id: ip_nat.c,v 2.0.1.10 1997/02/08 06:38:49 darrenr Exp $";
+#endif
+
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdio.h>
+# include <string.h>
+# include <stdlib.h>
+#endif
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#ifdef _KERNEL
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+#else
+# include <sys/byteorder.h>
+# include <sys/dditypes.h>
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+
+#include <net/if.h>
+#ifdef sun
+#include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+
+#ifdef RFC1825
+#include <vpn/md5.h>
+#include <vpn/ipsec.h>
+extern struct ifnet vpnif;
+#endif
+
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_nat.h"
+#include "ip_state.h"
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+nat_t *nat_table[2][NAT_SIZE], *nat_instances = NULL;
+ipnat_t *nat_list = NULL;
+u_long nat_inuse = 0,
+ fr_defnatage = 1200;
+natstat_t nat_stats;
+#if SOLARIS
+# ifndef _KERNEL
+#define bzero(a,b) memset(a,0,b)
+#define bcmp(a,b,c) memcpy(a,b,c)
+#define bcopy(a,b,c) memmove(b,a,c)
+# else
+extern kmutex_t ipf_nat;
+# endif
+#endif
+
+static int flush_nattable(), clear_natlist();
+static void nattable_sync();
+
+void fix_outcksum(sp, n)
+u_short *sp;
+u_long n;
+{
+ register u_short sumshort;
+ register u_long sum1;
+
+#ifdef sparc
+ sum1 = (~(*sp)) & 0xffff;
+#else
+ sum1 = (~ntohs(*sp)) & 0xffff;
+#endif
+ sum1 += (n);
+ sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+ /* Again */
+ sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+ sumshort = ~(u_short)sum1;
+ *(sp) = htons(sumshort);
+}
+
+
+void fix_incksum(sp, n)
+u_short *sp;
+u_long n;
+{
+ register u_short sumshort;
+ register u_long sum1;
+
+#ifdef sparc
+ sum1 = (~(*sp)) & 0xffff;
+#else
+ sum1 = (~ntohs(*sp)) & 0xffff;
+#endif
+ sum1 += ~(n) & 0xffff;
+ sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+ /* Again */
+ sum1 = (sum1 >> 16) + (sum1 & 0xffff);
+ sumshort = ~(u_short)sum1;
+ *(sp) = htons(sumshort);
+}
+
+
+/*
+ * How the NAT is organised and works.
+ *
+ * Inside (interface y) NAT Outside (interface x)
+ * -------------------- -+- -------------------------------------
+ * Packet going | out, processsed by ip_natout() for x
+ * ------------> | ------------>
+ * src=10.1.1.1 | src=192.1.1.1
+ * |
+ * | in, processed by ip_natin() for x
+ * <------------ | <------------
+ * dst=10.1.1.1 | dst=192.1.1.1
+ * -------------------- -+- -------------------------------------
+ * ip_natout() - changes ip_src and if required, sport
+ * - creates a new mapping, if required.
+ * ip_natin() - changes ip_dst and if required, dport
+ *
+ * In the NAT table, internal source is recorded as "in" and externally
+ * seen as "out".
+ */
+
+/*
+ * Handle ioctls which manipulate the NAT.
+ */
+int nat_ioctl(data, cmd, mode)
+caddr_t data;
+int cmd, mode;
+{
+ register ipnat_t *nat, *n = NULL, **np = NULL;
+ ipnat_t natd;
+ int error = 0, ret;
+
+ /*
+ * For add/delete, look to see if the NAT entry is already present
+ */
+ MUTEX_ENTER(&ipf_nat);
+ if ((cmd == SIOCADNAT) || (cmd == SIOCRMNAT)) {
+ IRCOPY(data, (char *)&natd, sizeof(natd));
+ nat = &natd;
+ for (np = &nat_list; (n = *np); np = &n->in_next)
+ if (!bcmp((char *)&nat->in_flags, (char *)&n->in_flags,
+ IPN_CMPSIZ))
+ break;
+ }
+
+ switch (cmd)
+ {
+ case SIOCADNAT :
+ if (!(mode & FWRITE)) {
+ error = EPERM;
+ break;
+ }
+ if (n) {
+ error = EEXIST;
+ break;
+ }
+ if (!(n = (ipnat_t *)KMALLOC(sizeof(*n)))) {
+ error = ENOMEM;
+ break;
+ }
+ IRCOPY((char *)data, (char *)n, sizeof(*n));
+ n->in_ifp = (void *)GETUNIT(n->in_ifname);
+ n->in_next = *np;
+ n->in_use = 0;
+ n->in_space = ~(0xffffffff & ntohl(n->in_outmsk));
+ if (n->in_space) /* lose 2: broadcast + network address */
+ n->in_space -= 2;
+ else
+ n->in_space = 1; /* single IP# mapping */
+ if (n->in_outmsk != 0xffffffff)
+ n->in_nip = ntohl(n->in_outip) + 1;
+ else
+ n->in_nip = ntohl(n->in_outip);
+ if (n->in_redir == NAT_MAP) {
+ n->in_pnext = ntohs(n->in_pmin);
+ /*
+ * Multiply by the number of ports made available.
+ */
+ if (ntohs(n->in_pmax) > ntohs(n->in_pmin))
+ n->in_space *= (ntohs(n->in_pmax) -
+ ntohs(n->in_pmin));
+ }
+ /* Otherwise, these fields are preset */
+ *np = n;
+ break;
+ case SIOCRMNAT :
+ if (!(mode & FWRITE)) {
+ error = EPERM;
+ break;
+ }
+ if (!n) {
+ error = ESRCH;
+ break;
+ }
+ *np = n->in_next;
+
+ KFREE(n);
+ nattable_sync();
+ break;
+ case SIOCGNATS :
+ nat_stats.ns_table[0] = nat_table[0];
+ nat_stats.ns_table[1] = nat_table[1];
+ nat_stats.ns_list = nat_list;
+ nat_stats.ns_inuse = nat_inuse;
+ IWCOPY((char *)&nat_stats, (char *)data, sizeof(nat_stats));
+ break;
+ case SIOCGNATL :
+ {
+ natlookup_t nl;
+
+ IRCOPY((char *)data, (char *)&nl, sizeof(nl));
+
+ if (nat_lookupredir(&nl))
+ IWCOPY((char *)&nl, (char *)data, sizeof(nl));
+ else
+ error = ESRCH;
+ break;
+ }
+ case SIOCFLNAT :
+ if (!(mode & FWRITE)) {
+ error = EPERM;
+ break;
+ }
+ ret = flush_nattable();
+ IWCOPY((caddr_t)&ret, data, sizeof(ret));
+ break;
+ case SIOCCNATL :
+ if (!(mode & FWRITE)) {
+ error = EPERM;
+ break;
+ }
+ ret = clear_natlist();
+ IWCOPY((caddr_t)&ret, data, sizeof(ret));
+ break;
+ }
+ MUTEX_EXIT(&ipf_nat);
+ return error;
+}
+
+
+static void nat_delete(natd)
+struct nat *natd;
+{
+ register struct nat **natp, *nat;
+
+ for (natp = natd->nat_hstart[0]; (nat = *natp);
+ natp = &nat->nat_hnext[0])
+ if (nat == natd) {
+ *natp = nat->nat_hnext[0];
+ break;
+ }
+
+ for (natp = natd->nat_hstart[1]; (nat = *natp);
+ natp = &nat->nat_hnext[1])
+ if (nat == natd) {
+ *natp = nat->nat_hnext[1];
+ break;
+ }
+
+ if (natd->nat_ptr) {
+ natd->nat_ptr->in_space++;
+ natd->nat_ptr->in_use--;
+ }
+ KFREE(natd);
+ nat_inuse--;
+}
+
+
+/*
+ * flush_nattable - clear the NAT table of all mapping entries.
+ */
+static int flush_nattable()
+{
+ register nat_t *nat, **natp;
+ register int j = 0;
+
+ /*
+ * Everything will be deleted, so lets just make it the deletions
+ * quicker.
+ */
+ bzero((char *)nat_table[0], sizeof(nat_table[0]));
+ bzero((char *)nat_table[1], sizeof(nat_table[1]));
+
+ for (natp = &nat_instances; (nat = *natp); ) {
+ *natp = nat->nat_next;
+ nat_delete(nat);
+ j++;
+ }
+
+ return j;
+}
+
+
+/*
+ * I know this is O(N*M), but it can't be avoided.
+ */
+static void nattable_sync()
+{
+ register nat_t *nat;
+ register ipnat_t *np;
+ int i;
+
+ for (i = NAT_SIZE - 1; i >= 0; i--)
+ for (nat = nat_instances; nat; nat = nat->nat_next) {
+ for (np = nat_list; np; np = np->in_next)
+ if (nat->nat_ptr == np)
+ break;
+ /*
+ * XXX - is it better to remove this if ? works the
+ * same if it is just "nat->nat_ptr = np".
+ */
+ if (!np)
+ nat->nat_ptr = NULL;
+ }
+}
+
+
+/*
+ * clear_natlist - delete all entries in the active NAT mapping list.
+ */
+static int clear_natlist()
+{
+ register ipnat_t *n, **np;
+ int i = 0;
+
+ for (np = &nat_list; (n = *np); i++) {
+ *np = n->in_next;
+ KFREE(n);
+ }
+
+ nattable_sync();
+ return i;
+}
+
+
+/*
+ * Create a new NAT table entry.
+ */
+nat_t *nat_new(np, ip, fin, flags, direction)
+ipnat_t *np;
+ip_t *ip;
+fr_info_t *fin;
+u_short flags;
+int direction;
+{
+ register u_long sum1, sum2, sumd;
+ u_short port = 0, sport = 0, dport = 0, nport = 0;
+ struct in_addr in;
+ tcphdr_t *tcp = NULL;
+ nat_t *nat, **natp;
+ u_short nflags;
+
+ nflags = flags & np->in_flags;
+ if (flags & IPN_TCPUDP) {
+ tcp = (tcphdr_t *)fin->fin_dp;
+ sport = tcp->th_sport;
+ dport = tcp->th_dport;
+ }
+
+ /* Give me a new nat */
+ if (!(nat = (nat_t *)KMALLOC(sizeof(*nat))))
+ return NULL;
+
+ bzero((char *)nat, sizeof(*nat));
+
+ /*
+ * Search the current table for a match.
+ */
+ if (direction == NAT_OUTBOUND) {
+ /*
+ * If it's an outbound packet which doesn't match any existing
+ * record, then create a new port
+ */
+ do {
+ port = 0;
+ in.s_addr = np->in_nip;
+ if (nflags & IPN_TCPUDP) {
+ port = htons(np->in_pnext++);
+ if (np->in_pnext >= ntohs(np->in_pmax)) {
+ np->in_pnext = ntohs(np->in_pmin);
+ np->in_space--;
+ if (np->in_outmsk != 0xffffffff)
+ np->in_nip++;
+ }
+ } else if (np->in_outmsk != 0xffffffff) {
+ np->in_space--;
+ np->in_nip++;
+ }
+
+ if (!port && (flags & IPN_TCPUDP))
+ port = sport;
+ if ((np->in_nip & ntohl(np->in_outmsk)) >
+ ntohl(np->in_outip))
+ np->in_nip = ntohl(np->in_outip) + 1;
+ } while (nat_inlookup(flags, ip->ip_dst, dport, in, port));
+
+ /* Setup the NAT table */
+ nat->nat_inip = ip->ip_src;
+ nat->nat_outip.s_addr = htonl(in.s_addr);
+ nat->nat_oip = ip->ip_dst;
+
+ sum1 = (ntohl(ip->ip_src.s_addr) & 0xffff) +
+ (ntohl(ip->ip_src.s_addr) >> 16) + ntohs(sport);
+
+ sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16) + ntohs(port);
+
+ if (flags & IPN_TCPUDP) {
+ nat->nat_inport = sport;
+ nat->nat_outport = port;
+ nat->nat_oport = dport;
+ }
+ } else {
+
+ /*
+ * Otherwise, it's an inbound packet. Most likely, we don't
+ * want to rewrite source ports and source addresses. Instead,
+ * we want to rewrite to a fixed internal address and fixed
+ * internal port.
+ */
+ in.s_addr = ntohl(np->in_inip);
+ if (!(nport = np->in_pnext))
+ nport = dport;
+
+ nat->nat_inip.s_addr = htonl(in.s_addr);
+ nat->nat_outip = ip->ip_dst;
+ nat->nat_oip = ip->ip_src;
+
+ sum1 = (ntohl(ip->ip_dst.s_addr) & 0xffff) +
+ (ntohl(ip->ip_dst.s_addr) >> 16) + ntohs(dport);
+
+ sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16) + ntohs(nport);
+
+ if (flags & IPN_TCPUDP) {
+ nat->nat_inport = nport;
+ nat->nat_outport = dport;
+ nat->nat_oport = sport;
+ }
+ }
+
+ /* Do it twice */
+ sum1 = (sum1 & 0xffff) + (sum1 >> 16);
+ sum1 = (sum1 & 0xffff) + (sum1 >> 16);
+
+ /* Do it twice */
+ sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+ sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+
+ if (sum1 > sum2)
+ sum2--; /* Because ~1 == -2, We really need ~1 == -1 */
+ sumd = sum2 - sum1;
+ sumd = (sumd & 0xffff) + (sumd >> 16);
+ nat->nat_sumd = (sumd & 0xffff) + (sumd >> 16);
+
+ if ((flags & IPN_TCPUDP) && ((sport != port) || (dport != nport))) {
+ if (direction == NAT_OUTBOUND)
+ sum1 = (ntohl(ip->ip_src.s_addr) & 0xffff) +
+ (ntohl(ip->ip_src.s_addr) >> 16);
+ else
+ sum1 = (ntohl(ip->ip_dst.s_addr) & 0xffff) +
+ (ntohl(ip->ip_dst.s_addr) >> 16);
+
+ sum2 = (in.s_addr & 0xffff) + (in.s_addr >> 16);
+
+ /* Do it twice */
+ sum1 = (sum1 & 0xffff) + (sum1 >> 16);
+ sum1 = (sum1 & 0xffff) + (sum1 >> 16);
+
+ /* Do it twice */
+ sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+ sum2 = (sum2 & 0xffff) + (sum2 >> 16);
+
+ if (sum1 > sum2)
+ sum2--; /* Because ~1 == -2, We really need ~1 == -1 */
+ sumd = sum2 - sum1;
+ sumd = (sumd & 0xffff) + (sumd >> 16);
+ nat->nat_ipsumd = (sumd & 0xffff) + (sumd >> 16);
+ } else
+ nat->nat_ipsumd = nat->nat_sumd;
+
+ in.s_addr = htonl(in.s_addr);
+ nat->nat_next = nat_instances;
+ nat_instances = nat;
+ natp = &nat_table[0][nat->nat_inip.s_addr % NAT_SIZE];
+ nat->nat_hstart[0] = natp;
+ nat->nat_hnext[0] = *natp;
+ *natp = nat;
+ natp = &nat_table[1][nat->nat_outip.s_addr % NAT_SIZE];
+ nat->nat_hstart[1] = natp;
+ nat->nat_hnext[1] = *natp;
+ *natp = nat;
+ nat->nat_ptr = np;
+ np->in_use++;
+ if (direction == NAT_OUTBOUND) {
+ if (flags & IPN_TCPUDP)
+ tcp->th_sport = htons(port);
+ } else {
+ if (flags & IPN_TCPUDP)
+ tcp->th_dport = htons(nport);
+ }
+ nat_stats.ns_added++;
+ nat_inuse++;
+ return nat;
+}
+
+
+/*
+ * NB: these lookups don't lock access to the list, it assume it has already
+ * been done!
+ */
+/*
+ * Lookup a nat entry based on the mapped destination ip address/port and
+ * real source address/port. We use this lookup when receiving a packet,
+ * we're looking for a table entry, based on the destination address.
+ * NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
+ */
+nat_t *nat_inlookup(flags, src, sport, mapdst, mapdport)
+register int flags;
+struct in_addr src , mapdst;
+u_short sport, mapdport;
+{
+ register nat_t *nat;
+
+ flags &= IPN_TCPUDP;
+
+ nat = nat_table[1][mapdst.s_addr % NAT_SIZE];
+ for (; nat; nat = nat->nat_hnext[1])
+ if (nat->nat_oip.s_addr == src.s_addr &&
+ nat->nat_outip.s_addr == mapdst.s_addr &&
+ (!flags || (nat->nat_oport == sport &&
+ nat->nat_outport == mapdport)))
+ return nat;
+ return NULL;
+}
+
+
+/*
+ * Lookup a nat entry based on the source 'real' ip address/port and
+ * destination address/port. We use this lookup when sending a packet out,
+ * we're looking for a table entry, based on the source address.
+ * NOTE: THE PACKET BEING CHECKED (IF FOUND) HAS A MAPPING ALREADY.
+ */
+nat_t *nat_outlookup(flags, src, sport, dst, dport)
+register int flags;
+struct in_addr src , dst;
+u_short sport, dport;
+{
+ register nat_t *nat;
+
+ flags &= IPN_TCPUDP;
+
+ nat = nat_table[0][src.s_addr % NAT_SIZE];
+ for (; nat; nat = nat->nat_hnext[0])
+ if (nat->nat_inip.s_addr == src.s_addr &&
+ nat->nat_oip.s_addr == dst.s_addr &&
+ (!flags || (nat->nat_inport == sport &&
+ nat->nat_oport == dport)))
+ return nat;
+ return NULL;
+}
+
+
+/*
+ * Lookup a nat entry based on the mapped source ip address/port and
+ * real destination address/port. We use this lookup when sending a packet
+ * out, we're looking for a table entry, based on the source address.
+ */
+nat_t *nat_lookupmapip(flags, mapsrc, mapsport, dst, dport)
+register int flags;
+struct in_addr mapsrc , dst;
+u_short mapsport, dport;
+{
+ register nat_t *nat;
+
+ flags &= IPN_TCPUDP;
+
+ nat = nat_table[1][mapsrc.s_addr % NAT_SIZE];
+ for (; nat; nat = nat->nat_hnext[0])
+ if (nat->nat_outip.s_addr == mapsrc.s_addr &&
+ nat->nat_oip.s_addr == dst.s_addr &&
+ (!flags || (nat->nat_outport == mapsport &&
+ nat->nat_oport == dport)))
+ return nat;
+ return NULL;
+}
+
+
+/*
+ * Lookup the NAT tables to search for a matching redirect
+ */
+nat_t *nat_lookupredir(np)
+register natlookup_t *np;
+{
+ nat_t *nat;
+
+ /*
+ * If nl_inip is non null, this is a lookup based on the real
+ * ip address. Else, we use the fake.
+ */
+ if ((nat = nat_outlookup(IPN_TCPUDP, np->nl_inip, np->nl_inport,
+ np->nl_outip, np->nl_outport))) {
+ np->nl_inip = nat->nat_outip;
+ np->nl_inport = nat->nat_outport;
+ }
+ return nat;
+}
+
+
+/*
+ * Packets going out on the external interface go through this.
+ * Here, the source address requires alteration, if anything.
+ */
+int ip_natout(ip, hlen, fin)
+ip_t *ip;
+int hlen;
+fr_info_t *fin;
+{
+ register ipnat_t *np;
+ register u_long ipa;
+ tcphdr_t *tcp = NULL;
+ nat_t *nat;
+ u_short nflags = 0, sport = 0, dport = 0, *csump = NULL;
+ struct ifnet *ifp;
+ frentry_t *fr;
+
+ if ((fr = fin->fin_fr) && !(fr->fr_flags & FR_DUP) &&
+ fr->fr_tif.fd_ifp && fr->fr_tif.fd_ifp != (void *)-1)
+ ifp = fr->fr_tif.fd_ifp;
+ else
+ ifp = fin->fin_ifp;
+
+ if (!(ip->ip_off & 0x1fff) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
+ if (ip->ip_p == IPPROTO_TCP)
+ nflags = IPN_TCP;
+ else if (ip->ip_p == IPPROTO_UDP)
+ nflags = IPN_UDP;
+ if (nflags) {
+ tcp = (tcphdr_t *)fin->fin_dp;
+ sport = tcp->th_sport;
+ dport = tcp->th_dport;
+ }
+ }
+
+ ipa = ip->ip_src.s_addr;
+
+ MUTEX_ENTER(&ipf_nat);
+ for (np = nat_list; np; np = np->in_next)
+ if ((np->in_ifp == ifp) && np->in_space &&
+ (!np->in_flags || (np->in_flags & nflags)) &&
+ ((ipa & np->in_inmsk) == np->in_inip) &&
+ ((np->in_redir == NAT_MAP) ||
+ (np->in_pnext == sport))) {
+ /*
+ * If there is no current entry in the nat table for
+ * this IP#, create one for it.
+ */
+ if (!(nat = nat_outlookup(nflags, ip->ip_src, sport,
+ ip->ip_dst, dport))) {
+ if (np->in_redir == NAT_REDIRECT)
+ continue;
+ /*
+ * if it's a redirection, then we don't want
+ * to create new outgoing port stuff.
+ * Redirections are only for incoming
+ * connections.
+ */
+ if (!(nat = nat_new(np, ip, fin, nflags,
+ NAT_OUTBOUND)))
+ break;
+ }
+ ip->ip_src = nat->nat_outip;
+
+ nat->nat_age = fr_defnatage; /* 5 mins */
+
+ /*
+ * Fix up checksums, not by recalculating them, but
+ * simply computing adjustments.
+ */
+#if SOLARIS
+ if (np->in_redir == NAT_MAP)
+ fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
+ else
+ fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
+#endif
+
+ if (nflags && !(ip->ip_off & 0x1fff) &&
+ !(fin->fin_fi.fi_fl & FI_SHORT)) {
+
+ if (nat->nat_outport)
+ tcp->th_sport = nat->nat_outport;
+
+ if (ip->ip_p == IPPROTO_TCP) {
+ csump = &tcp->th_sum;
+ set_tcp_age(&nat->nat_age,
+ nat->nat_state, ip, fin,1);
+ } else if (ip->ip_p == IPPROTO_UDP) {
+ udphdr_t *udp = (udphdr_t *)tcp;
+
+ if (udp->uh_sum)
+ csump = &udp->uh_sum;
+ } else if (ip->ip_p == IPPROTO_ICMP) {
+ icmphdr_t *ic = (icmphdr_t *)tcp;
+
+ csump = &ic->icmp_cksum;
+ }
+ if (csump) {
+ if (np->in_redir == NAT_MAP)
+ fix_outcksum(csump,
+ nat->nat_sumd);
+ else
+ fix_incksum(csump,
+ nat->nat_sumd);
+ }
+ }
+ nat_stats.ns_mapped[1]++;
+ MUTEX_EXIT(&ipf_nat);
+ return 1;
+ }
+ MUTEX_EXIT(&ipf_nat);
+ return 0;
+}
+
+
+/*
+ * Packets coming in from the external interface go through this.
+ * Here, the destination address requires alteration, if anything.
+ */
+int ip_natin(ip, hlen, fin)
+ip_t *ip;
+int hlen;
+fr_info_t *fin;
+{
+ register ipnat_t *np;
+ register struct in_addr in;
+ struct ifnet *ifp = fin->fin_ifp;
+ tcphdr_t *tcp = NULL;
+ u_short sport = 0, dport = 0, nflags = 0, *csump = NULL;
+ nat_t *nat;
+
+ if (!(ip->ip_off & 0x1fff) && !(fin->fin_fi.fi_fl & FI_SHORT)) {
+ if (ip->ip_p == IPPROTO_TCP)
+ nflags = IPN_TCP;
+ else if (ip->ip_p == IPPROTO_UDP)
+ nflags = IPN_UDP;
+ if (nflags) {
+ tcp = (tcphdr_t *)((char *)ip + hlen);
+ dport = tcp->th_dport;
+ sport = tcp->th_sport;
+ }
+ }
+
+ in = ip->ip_dst;
+
+ MUTEX_ENTER(&ipf_nat);
+ for (np = nat_list; np; np = np->in_next)
+ if ((np->in_ifp == ifp) &&
+ (!np->in_flags || (nflags & np->in_flags)) &&
+ ((in.s_addr & np->in_outmsk) == np->in_outip) &&
+ (np->in_redir == NAT_MAP || np->in_pmin == dport)) {
+ if (!(nat = nat_inlookup(nflags, ip->ip_src, sport,
+ ip->ip_dst, dport))) {
+ if (np->in_redir == NAT_MAP)
+ continue;
+ else {
+ /*
+ * If this rule (np) is a redirection,
+ * rather than a mapping, then do a
+ * nat_new. Otherwise, if it's just a
+ * mapping, do a continue;
+ */
+ if (!(nat = nat_new(np, ip, fin,
+ nflags,
+ NAT_INBOUND)))
+ break;
+ }
+ }
+ ip->ip_dst = nat->nat_inip;
+
+ nat->nat_age = fr_defnatage;
+
+ /*
+ * Fix up checksums, not by recalculating them, but
+ * simply computing adjustments.
+ */
+#if SOLARIS
+ if (np->in_redir == NAT_MAP)
+ fix_incksum(&ip->ip_sum, nat->nat_ipsumd);
+ else
+ fix_outcksum(&ip->ip_sum, nat->nat_ipsumd);
+#endif
+ if (nflags && !(ip->ip_off & 0x1fff) &&
+ !(fin->fin_fi.fi_fl & FI_SHORT)) {
+
+ if (nat->nat_inport)
+ tcp->th_dport = nat->nat_inport;
+
+ if (ip->ip_p == IPPROTO_TCP) {
+ csump = &tcp->th_sum;
+ set_tcp_age(&nat->nat_age,
+ nat->nat_state, ip, fin,0);
+ } else if (ip->ip_p == IPPROTO_UDP) {
+ udphdr_t *udp = (udphdr_t *)tcp;
+
+ if (udp->uh_sum)
+ csump = &udp->uh_sum;
+ } else if (ip->ip_p == IPPROTO_ICMP) {
+ icmphdr_t *ic = (icmphdr_t *)tcp;
+
+ csump = &ic->icmp_cksum;
+ }
+ if (csump) {
+ if (np->in_redir == NAT_MAP)
+ fix_incksum(csump,
+ nat->nat_sumd);
+ else
+ fix_outcksum(csump,
+ nat->nat_sumd);
+ }
+ }
+ nat_stats.ns_mapped[0]++;
+ MUTEX_EXIT(&ipf_nat);
+ return 1;
+ }
+ MUTEX_EXIT(&ipf_nat);
+ return 0;
+}
+
+
+/*
+ * Free all memory used by NAT structures allocated at runtime.
+ */
+void ip_natunload()
+{
+ MUTEX_ENTER(&ipf_nat);
+
+ (void) clear_natlist();
+ (void) flush_nattable();
+
+ MUTEX_EXIT(&ipf_nat);
+}
+
+
+/*
+ * Slowly expire held state for NAT entries. Timeouts are set in
+ * expectation of this being called twice per second.
+ */
+void ip_natexpire()
+{
+ register struct nat *nat, **natp;
+
+ MUTEX_ENTER(&ipf_nat);
+ for (natp = &nat_instances; (nat = *natp); natp = &nat->nat_next) {
+ if (--nat->nat_age)
+ continue;
+ *natp = nat->nat_next;
+ nat_delete(nat);
+ nat_stats.ns_expire++;
+ }
+ MUTEX_EXIT(&ipf_nat);
+}
diff --git a/sys/netinet/ip_nat.h b/sys/netinet/ip_nat.h
new file mode 100644
index 000000000000..d64183ac3920
--- /dev/null
+++ b/sys/netinet/ip_nat.h
@@ -0,0 +1,118 @@
+/*
+ * (C)opyright 1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_nat.h 1.5 2/4/96
+ * $Id: ip_nat.h,v 2.0.1.7 1997/01/30 12:39:41 darrenr Exp $
+ */
+
+#ifndef __IP_NAT_H_
+#define __IP_NAT_H__
+
+#ifndef SOLARIS
+#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
+#endif
+
+#if defined(__STDC__) || defined(__GNUC__)
+#define SIOCADNAT _IOW('r', 80, struct ipnat)
+#define SIOCRMNAT _IOW('r', 81, struct ipnat)
+#define SIOCGNATS _IOR('r', 82, struct natstat)
+#define SIOCGNATL _IOWR('r', 83, struct natlookup)
+#define SIOCGFRST _IOR('r', 84, struct ipfrstat)
+#define SIOCGIPST _IOR('r', 85, struct ips_stat)
+#define SIOCFLNAT _IOWR('r', 86, int)
+#define SIOCCNATL _IOWR('r', 87, int)
+
+#else
+#define SIOCADNAT _IOW(r, 80, struct ipnat)
+#define SIOCRMNAT _IOW(r, 81, struct ipnat)
+#define SIOCGNATS _IOR(r, 82, struct natstat)
+#define SIOCGNATL _IOWR(r, 83, struct natlookup)
+#define SIOCGFRST _IOR(r, 84, struct ipfrstat)
+#define SIOCGIPST _IOR(r, 85, struct ips_stat)
+#define SIOCFLNAT _IOWR(r, 86, int)
+#define SIOCCNATL _IOWR(r, 87, int)
+#endif
+
+#define NAT_SIZE 367
+
+typedef struct nat {
+ int nat_age;
+ u_long nat_sumd;
+ u_long nat_ipsumd;
+ struct in_addr nat_inip;
+ struct in_addr nat_outip;
+ struct in_addr nat_oip; /* other ip */
+ u_short nat_oport; /* other port */
+ u_short nat_inport;
+ u_short nat_outport;
+ u_short nat_use;
+ u_char nat_state[2];
+ struct ipnat *nat_ptr;
+ struct nat *nat_next;
+ struct nat *nat_hnext[2];
+ struct nat **nat_hstart[2];
+} nat_t;
+
+typedef struct ipnat {
+ struct ipnat *in_next;
+ void *in_ifp;
+ u_int in_space;
+ u_int in_use;
+ struct in_addr in_nextip;
+ u_short in_pnext;
+ u_short in_flags;
+ u_short in_port[2];
+ struct in_addr in_in[2];
+ struct in_addr in_out[2];
+ int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
+ char in_ifname[IFNAMSIZ];
+} ipnat_t;
+
+#define in_pmin in_port[0] /* Also holds static redir port */
+#define in_pmax in_port[1]
+#define in_nip in_nextip.s_addr
+#define in_inip in_in[0].s_addr
+#define in_inmsk in_in[1].s_addr
+#define in_outip in_out[0].s_addr
+#define in_outmsk in_out[1].s_addr
+
+#define NAT_INBOUND 0
+#define NAT_OUTBOUND 1
+
+#define NAT_MAP 0
+#define NAT_REDIRECT 1
+
+#define IPN_CMPSIZ (sizeof(struct in_addr) * 4 + sizeof(u_short) * 3 + \
+ sizeof(int))
+
+typedef struct natlookup {
+ struct in_addr nl_inip;
+ struct in_addr nl_outip;
+ u_short nl_inport;
+ u_short nl_outport;
+} natlookup_t;
+
+typedef struct natstat {
+ u_long ns_mapped[2];
+ u_long ns_added;
+ u_long ns_expire;
+ u_long ns_inuse;
+ nat_t **ns_table[2];
+ ipnat_t *ns_list;
+} natstat_t;
+
+#define IPN_ANY 0
+#define IPN_TCP 1
+#define IPN_UDP 2
+#define IPN_TCPUDP 3
+
+extern nat_t *nat_table[2][NAT_SIZE];
+extern int nat_ioctl();
+extern nat_t *nat_outlookup(), *nat_inlookup(), *nat_lookupredir();
+extern int ip_natout(), ip_natin();
+extern void ip_natunload(), ip_natexpire();
+#endif /* __IP_NAT_H__ */
diff --git a/sys/netinet/ip_state.c b/sys/netinet/ip_state.c
new file mode 100644
index 000000000000..62a49aa250ed
--- /dev/null
+++ b/sys/netinet/ip_state.c
@@ -0,0 +1,536 @@
+/*
+ * (C)opyright 1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#if !defined(lint) && defined(LIBC_SCCS)
+static char sccsid[] = "@(#)ip_state.c 1.8 6/5/96 (C) 1993-1995 Darren Reed";
+static char rcsid[] = "$Id: ip_state.c,v 2.0.1.2 1997/01/09 15:22:45 darrenr Exp $";
+#endif
+
+#if !defined(_KERNEL) && !defined(KERNEL)
+# include <stdlib.h>
+# include <string.h>
+#endif
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#ifdef _KERNEL
+# include <sys/systm.h>
+#endif
+#if !defined(__SVR4) && !defined(__svr4__)
+# include <sys/mbuf.h>
+#else
+# include <sys/byteorder.h>
+# include <sys/dditypes.h>
+# include <sys/stream.h>
+# include <sys/kmem.h>
+#endif
+
+#include <net/if.h>
+#ifdef sun
+#include <net/af.h>
+#endif
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_fsm.h>
+#include <netinet/udp.h>
+#include <netinet/tcpip.h>
+#include <netinet/ip_icmp.h>
+#include "ip_fil.h"
+#include "ip_compat.h"
+#include "ip_state.h"
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+void set_tcp_age();
+
+#define TCP_CLOSE (TH_FIN|TH_RST)
+
+ipstate_t *ips_table[IPSTATE_SIZE];
+int ips_num = 0;
+ips_stat_t ips_stats;
+#if SOLARIS
+extern kmutex_t ipf_state;
+# if !defined(_KERNEL)
+#define bcopy(a,b,c) memmove(b,a,c)
+# endif
+#endif
+
+
+#define FIVE_DAYS (2 * 5 * 86400) /* 5 days: half closed session */
+
+u_long fr_tcpidletimeout = FIVE_DAYS,
+ fr_tcpclosewait = 60,
+ fr_tcplastack = 20,
+ fr_tcptimeout = 120,
+ fr_tcpclosed = 1,
+ fr_udptimeout = 120,
+ fr_icmptimeout = 120;
+
+
+ips_stat_t *fr_statetstats()
+{
+ ips_stats.iss_active = ips_num;
+ ips_stats.iss_table = ips_table;
+ return &ips_stats;
+}
+
+
+#define PAIRS(s1,d1,s2,d2) ((((s1) == (s2)) && ((d1) == (d2))) ||\
+ (((s1) == (d2)) && ((d1) == (s2))))
+#define IPPAIR(s1,d1,s2,d2) PAIRS((s1).s_addr, (d1).s_addr, \
+ (s2).s_addr, (d2).s_addr)
+
+/*
+ * Create a new ipstate structure and hang it off the hash table.
+ */
+int fr_addstate(ip, fin, pass)
+ip_t *ip;
+fr_info_t *fin;
+u_int pass;
+{
+ ipstate_t ips;
+ register ipstate_t *is = &ips;
+ register u_int hv;
+
+ if ((ip->ip_off & 0x1fff) || (fin->fin_fi.fi_fl & FI_SHORT))
+ return -1;
+ if (ips_num == IPSTATE_MAX) {
+ ips_stats.iss_max++;
+ return -1;
+ }
+ ips.is_age = 1;
+ ips.is_state[0] = 0;
+ ips.is_state[1] = 0;
+ /*
+ * Copy and calculate...
+ */
+ hv = (is->is_p = ip->ip_p);
+ hv += (is->is_src.s_addr = ip->ip_src.s_addr);
+ hv += (is->is_dst.s_addr = ip->ip_dst.s_addr);
+
+ switch (ip->ip_p)
+ {
+ case IPPROTO_ICMP :
+ {
+ struct icmp *ic = (struct icmp *)fin->fin_dp;
+
+ switch (ic->icmp_type)
+ {
+ case ICMP_ECHO :
+ is->is_icmp.ics_type = 0;
+ hv += (is->is_icmp.ics_id = ic->icmp_id);
+ hv += (is->is_icmp.ics_seq = ic->icmp_seq);
+ break;
+ case ICMP_TSTAMP :
+ case ICMP_IREQ :
+ case ICMP_MASKREQ :
+ is->is_icmp.ics_type = ic->icmp_type + 1;
+ break;
+ default :
+ return -1;
+ }
+ ips_stats.iss_icmp++;
+ is->is_age = fr_icmptimeout;
+ break;
+ }
+ case IPPROTO_TCP :
+ {
+ register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+
+ /*
+ * The endian of the ports doesn't matter, but the ack and
+ * sequence numbers do as we do mathematics on them later.
+ */
+ hv += (is->is_dport = tcp->th_dport);
+ hv += (is->is_sport = tcp->th_sport);
+ is->is_seq = ntohl(tcp->th_seq);
+ is->is_ack = ntohl(tcp->th_ack);
+ is->is_swin = ntohs(tcp->th_win);
+ is->is_dwin = is->is_swin; /* start them the same */
+ ips_stats.iss_tcp++;
+ /*
+ * If we're creating state for a starting connectoin, start the
+ * timer on it as we'll never see an error if it fails to
+ * connect.
+ */
+ if ((tcp->th_flags & (TH_SYN|TH_ACK)) == TH_SYN)
+ is->is_ack = 0; /* Trumpet WinSock 'ism */
+ set_tcp_age(&is->is_age, is->is_state, ip, fin,
+ tcp->th_sport == is->is_sport);
+ break;
+ }
+ case IPPROTO_UDP :
+ {
+ register tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+
+ hv += (is->is_dport = tcp->th_dport);
+ hv += (is->is_sport = tcp->th_sport);
+ ips_stats.iss_udp++;
+ is->is_age = fr_udptimeout;
+ break;
+ }
+ default :
+ return -1;
+ }
+
+ if (!(is = (ipstate_t *)KMALLOC(sizeof(*is)))) {
+ ips_stats.iss_nomem++;
+ return -1;
+ }
+ bcopy((char *)&ips, (char *)is, sizeof(*is));
+ hv %= IPSTATE_SIZE;
+ MUTEX_ENTER(&ipf_state);
+ is->is_next = ips_table[hv];
+ ips_table[hv] = is;
+ is->is_pass = pass;
+ if (pass & FR_LOGFIRST)
+ is->is_pass &= ~(FR_LOGFIRST|FR_LOG);
+ ips_num++;
+ MUTEX_EXIT(&ipf_state);
+ return 0;
+}
+
+
+/*
+ * check to see if a packet with TCP headers fits within the TCP window.
+ * change timeout depending on whether new packet is a SYN-ACK returning for a
+ * SYN or a RST or FIN which indicate time to close up shop.
+ */
+int fr_tcpstate(is, fin, ip, tcp, sport
+#ifndef _KERNEL
+,isp)
+ipstate_t **isp;
+#else
+)
+#endif
+register ipstate_t *is;
+fr_info_t *fin;
+ip_t *ip;
+tcphdr_t *tcp;
+u_short sport;
+{
+ register int seqskew, ackskew;
+ register u_short swin, dwin;
+ register tcp_seq seq, ack;
+ int source;
+
+ /*
+ * Find difference between last checked packet and this packet.
+ */
+ seq = ntohl(tcp->th_seq);
+ ack = ntohl(tcp->th_ack);
+ if (sport == is->is_sport) {
+ seqskew = seq - is->is_seq;
+ ackskew = ack - is->is_ack;
+ } else {
+ seqskew = ack - is->is_seq;
+ if (!is->is_ack)
+ /*
+ * Must be a SYN-ACK in reply to a SYN.
+ */
+ is->is_ack = seq;
+ ackskew = seq - is->is_ack;
+ }
+
+ /*
+ * Make skew values absolute
+ */
+ if (seqskew < 0)
+ seqskew = -seqskew;
+ if (ackskew < 0)
+ ackskew = -ackskew;
+
+ /*
+ * If the difference in sequence and ack numbers is within the
+ * window size of the connection, store these values and match
+ * the packet.
+ */
+ if ((source = (sport == is->is_sport))) {
+ swin = is->is_swin;
+ dwin = is->is_dwin;
+ } else {
+ dwin = is->is_swin;
+ swin = is->is_dwin;
+ }
+
+ if ((seqskew <= swin) && (ackskew <= dwin)) {
+ if (source) {
+ is->is_seq = seq;
+ is->is_ack = ack;
+ is->is_swin = ntohs(tcp->th_win);
+ } else {
+ is->is_seq = ack;
+ is->is_ack = seq;
+ is->is_dwin = ntohs(tcp->th_win);
+ }
+ ips_stats.iss_hits++;
+ /*
+ * Nearing end of connection, start timeout.
+ */
+ set_tcp_age(&is->is_age, is->is_state, ip, fin,
+ tcp->th_sport == is->is_sport);
+ return 1;
+ }
+ return 0;
+}
+
+
+/*
+ * Check if a packet has a registered state.
+ */
+int fr_checkstate(ip, fin)
+ip_t *ip;
+fr_info_t *fin;
+{
+ register struct in_addr dst, src;
+ register ipstate_t *is, **isp;
+ register u_char pr;
+ struct icmp *ic;
+ tcphdr_t *tcp;
+ u_int hv, hlen;
+
+ if ((ip->ip_off & 0x1fff) || (fin->fin_fi.fi_fl & FI_SHORT))
+ return 0;
+
+ hlen = fin->fin_hlen;
+ tcp = (tcphdr_t *)((char *)ip + hlen);
+ ic = (struct icmp *)tcp;
+ hv = (pr = ip->ip_p);
+ hv += (src.s_addr = ip->ip_src.s_addr);
+ hv += (dst.s_addr = ip->ip_dst.s_addr);
+
+ /*
+ * Search the hash table for matching packet header info.
+ */
+ switch (ip->ip_p)
+ {
+ case IPPROTO_ICMP :
+ hv += ic->icmp_id;
+ hv += ic->icmp_seq;
+ hv %= IPSTATE_SIZE;
+ MUTEX_ENTER(&ipf_state);
+ for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next)
+ if ((is->is_p == pr) &&
+ (ic->icmp_id == is->is_icmp.ics_id) &&
+ (ic->icmp_seq == is->is_icmp.ics_seq) &&
+ IPPAIR(src, dst, is->is_src, is->is_dst)) {
+ /*
+ * If we have type 0 stored, allow any icmp
+ * replies through.
+ */
+ if (is->is_icmp.ics_type &&
+ is->is_icmp.ics_type != ic->icmp_type)
+ continue;
+ is->is_age = fr_icmptimeout;
+ ips_stats.iss_hits++;
+ MUTEX_EXIT(&ipf_state);
+ return is->is_pass;
+ }
+ MUTEX_EXIT(&ipf_state);
+ break;
+ case IPPROTO_TCP :
+ {
+ register u_short dport = tcp->th_dport, sport = tcp->th_sport;
+
+ hv += dport;
+ hv += sport;
+ hv %= IPSTATE_SIZE;
+ MUTEX_ENTER(&ipf_state);
+ for (isp = &ips_table[hv]; (is = *isp); isp = &is->is_next) {
+ if ((is->is_p == pr) &&
+ PAIRS(sport, dport, is->is_sport, is->is_dport) &&
+ IPPAIR(src, dst, is->is_src, is->is_dst))
+ if (fr_tcpstate(is, fin, ip, tcp, sport)) {
+#ifdef _KERNEL
+ MUTEX_EXIT(&ipf_state);
+ return is->is_pass;
+#else
+ int pass = is->is_pass;
+
+ if (tcp->th_flags & TCP_CLOSE) {
+ *isp = is->is_next;
+ isp = &ips_table[hv];
+ KFREE(is);
+ }
+ return pass;
+#endif
+ }
+ }
+ MUTEX_EXIT(&ipf_state);
+ break;
+ }
+ case IPPROTO_UDP :
+ {
+ register u_short dport = tcp->th_dport, sport = tcp->th_sport;
+
+ hv += dport;
+ hv += sport;
+ hv %= IPSTATE_SIZE;
+ /*
+ * Nothing else to match on but ports. and IP#'s
+ */
+ MUTEX_ENTER(&ipf_state);
+ for (is = ips_table[hv]; is; is = is->is_next)
+ if ((is->is_p == pr) &&
+ PAIRS(sport, dport, is->is_sport, is->is_dport) &&
+ IPPAIR(src, dst, is->is_src, is->is_dst)) {
+ ips_stats.iss_hits++;
+ is->is_age = fr_udptimeout;
+ MUTEX_EXIT(&ipf_state);
+ return is->is_pass;
+ }
+ MUTEX_EXIT(&ipf_state);
+ break;
+ }
+ default :
+ break;
+ }
+ ips_stats.iss_miss++;
+ return 0;
+}
+
+
+/*
+ * Free memory in use by all state info. kept.
+ */
+void fr_stateunload()
+{
+ register int i;
+ register ipstate_t *is, **isp;
+
+ MUTEX_ENTER(&ipf_state);
+ for (i = 0; i < IPSTATE_SIZE; i++)
+ for (isp = &ips_table[i]; (is = *isp); ) {
+ *isp = is->is_next;
+ KFREE(is);
+ }
+ MUTEX_EXIT(&ipf_state);
+}
+
+
+/*
+ * Slowly expire held state for thingslike UDP and ICMP. Timeouts are set
+ * in expectation of this being called twice per second.
+ */
+void fr_timeoutstate()
+{
+ register int i;
+ register ipstate_t *is, **isp;
+
+ MUTEX_ENTER(&ipf_state);
+ for (i = 0; i < IPSTATE_SIZE; i++)
+ for (isp = &ips_table[i]; (is = *isp); )
+ if (is->is_age && !--is->is_age) {
+ *isp = is->is_next;
+ if (is->is_p == IPPROTO_TCP)
+ ips_stats.iss_fin++;
+ else
+ ips_stats.iss_expire++;
+ KFREE(is);
+ ips_num--;
+ } else
+ isp = &is->is_next;
+ MUTEX_EXIT(&ipf_state);
+}
+
+
+/*
+ * Original idea freom Pradeep Krishnan for use primarily with NAT code.
+ * (pkrishna@netcom.com)
+ */
+void set_tcp_age(age, state, ip, fin, dir)
+int *age;
+u_char *state;
+ip_t *ip;
+fr_info_t *fin;
+int dir;
+{
+ tcphdr_t *tcp = (tcphdr_t *)fin->fin_dp;
+ u_char flags = tcp->th_flags;
+ int dlen, ostate;
+
+ ostate = state[1 - dir];
+
+ dlen = ip->ip_len - fin->fin_hlen - (tcp->th_off << 2);
+
+ if (flags & TH_RST) {
+ if (!(tcp->th_flags & TH_PUSH) && !dlen) {
+ *age = fr_tcpclosed;
+ state[dir] = TCPS_CLOSED;
+ } else {
+ *age = fr_tcpclosewait;
+ state[dir] = TCPS_CLOSE_WAIT;
+ }
+ return;
+ }
+
+ *age = fr_tcptimeout; /* 1 min */
+
+ switch(state[dir])
+ {
+ case TCPS_FIN_WAIT_2:
+ case TCPS_CLOSED:
+ if ((flags & TH_OPENING) == TH_OPENING)
+ state[dir] = TCPS_SYN_RECEIVED;
+ else if (flags & TH_SYN)
+ state[dir] = TCPS_SYN_SENT;
+ break;
+ case TCPS_SYN_RECEIVED:
+ if ((flags & (TH_FIN|TH_ACK)) == TH_ACK) {
+ state[dir] = TCPS_ESTABLISHED;
+ *age = fr_tcpidletimeout;
+ }
+ break;
+ case TCPS_SYN_SENT:
+ if ((flags & (TH_FIN|TH_ACK)) == TH_ACK) {
+ state[dir] = TCPS_ESTABLISHED;
+ *age = fr_tcpidletimeout;
+ }
+ break;
+ case TCPS_ESTABLISHED:
+ if (flags & TH_FIN) {
+ state[dir] = TCPS_CLOSE_WAIT;
+ if (!(flags & TH_PUSH) && !dlen &&
+ ostate > TCPS_ESTABLISHED)
+ *age = fr_tcplastack;
+ else
+ *age = fr_tcpclosewait;
+ } else
+ *age = fr_tcpidletimeout;
+ break;
+ case TCPS_CLOSE_WAIT:
+ if ((flags & TH_FIN) && !(flags & TH_PUSH) && !dlen &&
+ ostate > TCPS_ESTABLISHED) {
+ *age = fr_tcplastack;
+ state[dir] = TCPS_LAST_ACK;
+ } else
+ *age = fr_tcpclosewait;
+ break;
+ case TCPS_LAST_ACK:
+ if (flags & TH_ACK) {
+ state[dir] = TCPS_FIN_WAIT_2;
+ if (!(flags & TH_PUSH) && !dlen &&
+ ostate > TCPS_ESTABLISHED)
+ *age = fr_tcplastack;
+ else {
+ *age = fr_tcpclosewait;
+ state[dir] = TCPS_CLOSE_WAIT;
+ }
+ }
+ break;
+ }
+}
diff --git a/sys/netinet/ip_state.h b/sys/netinet/ip_state.h
new file mode 100644
index 000000000000..ee30b986d844
--- /dev/null
+++ b/sys/netinet/ip_state.h
@@ -0,0 +1,86 @@
+/*
+ * (C)opyright 1995 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ *
+ * @(#)ip_state.h 1.3 1/12/96 (C) 1995 Darren Reed
+ * $Id: ip_state.h,v 2.0.1.1 1997/01/09 15:14:43 darrenr Exp $
+ */
+#ifndef __IP_STATE_H__
+#define __IP_STATE_H__
+
+#define IPSTATE_SIZE 257
+#define IPSTATE_MAX 2048 /* Maximum number of states held */
+
+typedef struct udpstate {
+ u_short us_sport;
+ u_short us_dport;
+} udpstate_t;
+
+typedef struct icmpstate {
+ u_short ics_id;
+ u_short ics_seq;
+ u_char ics_type;
+} icmpstate_t;
+
+typedef struct tcpstate {
+ u_short ts_sport;
+ u_short ts_dport;
+ u_long ts_seq;
+ u_long ts_ack;
+ u_short ts_swin;
+ u_short ts_dwin;
+ u_char ts_state[2];
+} tcpstate_t;
+
+typedef struct ipstate {
+ struct ipstate *is_next;
+ int is_age;
+ u_int is_pass;
+ struct in_addr is_src;
+ struct in_addr is_dst;
+ u_char is_p;
+ u_char is_flags;
+ union {
+ icmpstate_t is_ics;
+ tcpstate_t is_ts;
+ udpstate_t is_us;
+ } is_ps;
+} ipstate_t;
+
+#define is_icmp is_ps.is_ics
+#define is_tcp is_ps.is_ts
+#define is_udp is_ps.is_us
+#define is_seq is_tcp.ts_seq
+#define is_ack is_tcp.ts_ack
+#define is_dwin is_tcp.ts_dwin
+#define is_swin is_tcp.ts_swin
+#define is_sport is_tcp.ts_sport
+#define is_dport is_tcp.ts_dport
+#define is_state is_tcp.ts_state
+
+#define TH_OPENING (TH_SYN|TH_ACK)
+
+typedef struct ips_stat {
+ u_long iss_hits;
+ u_long iss_miss;
+ u_long iss_max;
+ u_long iss_tcp;
+ u_long iss_udp;
+ u_long iss_icmp;
+ u_long iss_nomem;
+ u_long iss_expire;
+ u_long iss_fin;
+ u_long iss_active;
+ ipstate_t **iss_table;
+} ips_stat_t;
+
+extern ips_stat_t *fr_statetstats();
+extern int fr_addstate(), fr_checkstate();
+extern void fr_timeoutstate(), set_tcp_age();
+# ifdef _KERNEL
+extern void fr_stateunload();
+# endif
+#endif /* __IP_STATE_H__ */