1/*
2 * Copyright (C) 1993-2001 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 */
6#ifdef __sgi
7# include <sys/ptimers.h>
8#endif
9#include <sys/errno.h>
10#include <sys/types.h>
11#include <sys/param.h>
12#include <sys/time.h>
13#include <sys/file.h>
14#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
15 defined(_KERNEL)
16# include "opt_ipfilter_log.h"
17#endif
18#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
19 (__FreeBSD_version >= 220000)
20# if (__FreeBSD_version >= 400000)
21# ifndef KLD_MODULE
22# include "opt_inet6.h"
23# endif
24# if (__FreeBSD_version == 400019)
25# define CSUM_DELAY_DATA
26# endif
27# endif
28# include <sys/filio.h>
29# include <sys/fcntl.h>
30#else
31# include <sys/ioctl.h>
32#endif
33#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
34# include <sys/systm.h>
35#else
36# include <stdio.h>
37# include <string.h>
38# include <stdlib.h>
39#endif
40#if !defined(__SVR4) && !defined(__svr4__)
41# ifndef linux
42# include <sys/mbuf.h>
43# endif
44#else
45# include <sys/byteorder.h>
46# if SOLARIS2 < 5
47# include <sys/dditypes.h>
48# endif
49# include <sys/stream.h>
50#endif
51#ifndef linux
52# include <sys/protosw.h>
53# include <sys/socket.h>
54#endif
55#include <net/if.h>
56#ifdef sun
57# include <net/af.h>
58#endif
59#include <net/route.h>
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/ip.h>
63#ifndef linux
64# include <netinet/ip_var.h>
65#endif
66#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
67# include <sys/hashing.h>
68# include <netinet/in_var.h>
69#endif
70#include <netinet/tcp.h>
71#include <netinet/udp.h>
72#include <netinet/ip_icmp.h>
73#include "netinet/ip_compat.h"
74#ifdef USE_INET6
75# include <netinet/icmp6.h>
76# if !SOLARIS && defined(_KERNEL)
77# include <netinet6/in6_var.h>
78# endif
79#endif
80#include <netinet/tcpip.h>
81#include "netinet/ip_fil.h"
82#include "netinet/ip_nat.h"
83#include "netinet/ip_frag.h"
84#include "netinet/ip_state.h"
85#include "netinet/ip_proxy.h"
86#include "netinet/ip_auth.h"
87# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
88# include <sys/malloc.h>
89# if defined(_KERNEL) && !defined(IPFILTER_LKM)
90# include "opt_ipfilter.h"
91# endif
92# endif
93#ifndef MIN
94# define MIN(a,b) (((a)<(b))?(a):(b))
95#endif
96#include "netinet/ipl.h"
97
98#include <machine/in_cksum.h>
99
100#if !defined(lint)
101static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
102static const char rcsid[] = "@(#)$FreeBSD: head/sys/contrib/ipfilter/netinet/fil.c 92685 2002-03-19 11:44:16Z darrenr $";
103#endif
104
105#ifndef _KERNEL
106# include "ipf.h"
107# include "ipt.h"
108extern int opts;
109
110# define FR_VERBOSE(verb_pr) verbose verb_pr
111# define FR_DEBUG(verb_pr) debug verb_pr
112# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
113#else /* #ifndef _KERNEL */
114# define FR_VERBOSE(verb_pr)
115# define FR_DEBUG(verb_pr)
116# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
117# if SOLARIS || defined(__sgi)
118extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat;
119extern kmutex_t ipf_rw;
120# endif /* SOLARIS || __sgi */
121#endif /* _KERNEL */
122
123
124struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
125struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
126#ifdef USE_INET6
127 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
128 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
129#endif
130 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
131struct frgroup *ipfgroups[3][2];
132int fr_flags = IPF_LOGGING;
133int fr_active = 0;
134int fr_chksrc = 0;
135int fr_minttl = 3;
136int fr_minttllog = 1;
137#if defined(IPFILTER_DEFAULT_BLOCK)
138int fr_pass = FR_NOMATCH|FR_BLOCK;
139#else
140int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
141#endif
142char ipfilter_version[] = IPL_VERSION;
143
144fr_info_t frcache[2];
145
146static int frflushlist __P((int, minor_t, int *, frentry_t **));
147#ifdef _KERNEL
148static void frsynclist __P((frentry_t *));
149#endif
150
151
152/*
153 * bit values for identifying presence of individual IP options
154 */
155struct optlist ipopts[20] = {
156 { IPOPT_NOP, 0x000001 },
157 { IPOPT_RR, 0x000002 },
158 { IPOPT_ZSU, 0x000004 },
159 { IPOPT_MTUP, 0x000008 },
160 { IPOPT_MTUR, 0x000010 },
161 { IPOPT_ENCODE, 0x000020 },
162 { IPOPT_TS, 0x000040 },
163 { IPOPT_TR, 0x000080 },
164 { IPOPT_SECURITY, 0x000100 },
165 { IPOPT_LSRR, 0x000200 },
166 { IPOPT_E_SEC, 0x000400 },
167 { IPOPT_CIPSO, 0x000800 },
168 { IPOPT_SATID, 0x001000 },
169 { IPOPT_SSRR, 0x002000 },
170 { IPOPT_ADDEXT, 0x004000 },
171 { IPOPT_VISA, 0x008000 },
172 { IPOPT_IMITD, 0x010000 },
173 { IPOPT_EIP, 0x020000 },
174 { IPOPT_FINN, 0x040000 },
175 { 0, 0x000000 }
176};
177
178/*
179 * bit values for identifying presence of individual IP security options
180 */
181struct optlist secopt[8] = {
182 { IPSO_CLASS_RES4, 0x01 },
183 { IPSO_CLASS_TOPS, 0x02 },
184 { IPSO_CLASS_SECR, 0x04 },
185 { IPSO_CLASS_RES3, 0x08 },
186 { IPSO_CLASS_CONF, 0x10 },
187 { IPSO_CLASS_UNCL, 0x20 },
188 { IPSO_CLASS_RES2, 0x40 },
189 { IPSO_CLASS_RES1, 0x80 }
190};
191
192
193/*
194 * compact the IP header into a structure which contains just the info.
195 * which is useful for comparing IP headers with.
196 */
197void fr_makefrip(hlen, ip, fin)
198int hlen;
199ip_t *ip;
200fr_info_t *fin;
201{
202 u_short optmsk = 0, secmsk = 0, auth = 0;
203 int i, mv, ol, off, p, plen, v;
204 fr_ip_t *fi = &fin->fin_fi;
205 struct optlist *op;
206 u_char *s, opt;
207 tcphdr_t *tcp;
208
209 fin->fin_rev = 0;
210 fin->fin_fr = NULL;
211 fin->fin_tcpf = 0;
212 fin->fin_data[0] = 0;
213 fin->fin_data[1] = 0;
214 fin->fin_rule = -1;
215 fin->fin_group = -1;
216#ifdef _KERNEL
217 fin->fin_icode = ipl_unreach;
218#endif
219 v = fin->fin_v;
220 fi->fi_v = v;
221 fin->fin_hlen = hlen;
222 if (v == 4) {
223 fin->fin_id = ip->ip_id;
224 fi->fi_tos = ip->ip_tos;
225 off = (ip->ip_off & IP_OFFMASK);
226 tcp = (tcphdr_t *)((char *)ip + hlen);
227 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
228 fi->fi_src.i6[1] = 0;
229 fi->fi_src.i6[2] = 0;
230 fi->fi_src.i6[3] = 0;
231 fi->fi_dst.i6[1] = 0;
232 fi->fi_dst.i6[2] = 0;
233 fi->fi_dst.i6[3] = 0;
234 fi->fi_saddr = ip->ip_src.s_addr;
235 fi->fi_daddr = ip->ip_dst.s_addr;
236 p = ip->ip_p;
237 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
238 if (ip->ip_off & (IP_MF|IP_OFFMASK))
239 fi->fi_fl |= FI_FRAG;
240 plen = ip->ip_len;
241 fin->fin_dlen = plen - hlen;
242 }
243#ifdef USE_INET6
244 else if (v == 6) {
245 ip6_t *ip6 = (ip6_t *)ip;
246
247 off = 0;
248 p = ip6->ip6_nxt;
249 fi->fi_p = p;
250 fi->fi_ttl = ip6->ip6_hlim;
251 tcp = (tcphdr_t *)(ip6 + 1);
252 fi->fi_src.in6 = ip6->ip6_src;
253 fi->fi_dst.in6 = ip6->ip6_dst;
254 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
255 fi->fi_tos = 0;
256 fi->fi_fl = 0;
257 plen = ntohs(ip6->ip6_plen);
258 fin->fin_dlen = plen;
259 plen += sizeof(*ip6);
260 }
261#endif
262 else
263 return;
264
265 fin->fin_off = off;
266 fin->fin_plen = plen;
267 fin->fin_dp = (char *)tcp;
268 off <<= 3;
269
270 switch (p)
271 {
272#ifdef USE_INET6
273 case IPPROTO_ICMPV6 :
274 {
275 int minicmpsz = sizeof(struct icmp6_hdr);
276 struct icmp6_hdr *icmp6;
277
278 if (fin->fin_dlen > 1) {
279 fin->fin_data[0] = *(u_short *)tcp;
280
281 icmp6 = (struct icmp6_hdr *)tcp;
282
283 switch (icmp6->icmp6_type)
284 {
285 case ICMP6_ECHO_REPLY :
286 case ICMP6_ECHO_REQUEST :
287 minicmpsz = ICMP6_MINLEN;
288 break;
289 case ICMP6_DST_UNREACH :
290 case ICMP6_PACKET_TOO_BIG :
291 case ICMP6_TIME_EXCEEDED :
292 case ICMP6_PARAM_PROB :
293 minicmpsz = ICMP6ERR_IPICMPHLEN;
294 break;
295 default :
296 break;
297 }
298 }
299
300 if (!(plen >= hlen + minicmpsz))
301 fi->fi_fl |= FI_SHORT;
302
303 break;
304 }
305#endif
306 case IPPROTO_ICMP :
307 {
308 int minicmpsz = sizeof(struct icmp);
309 icmphdr_t *icmp;
310
311 if (!off && (fin->fin_dlen > 1)) {
312 fin->fin_data[0] = *(u_short *)tcp;
313
314 icmp = (icmphdr_t *)tcp;
315
316 switch (icmp->icmp_type)
317 {
318 case ICMP_ECHOREPLY :
319 case ICMP_ECHO :
320 /* Router discovery messages - RFC 1256 */
321 case ICMP_ROUTERADVERT :
322 case ICMP_ROUTERSOLICIT :
323 minicmpsz = ICMP_MINLEN;
324 break;
325 /*
326 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
327 * 3*timestamp(3*4)
328 */
329 case ICMP_TSTAMP :
330 case ICMP_TSTAMPREPLY :
331 minicmpsz = 20;
332 break;
333 /*
334 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
335 * mask(4)
336 */
337 case ICMP_MASKREQ :
338 case ICMP_MASKREPLY :
339 minicmpsz = 12;
340 break;
341 default :
342 break;
343 }
344 }
345
346 if ((!(plen >= hlen + minicmpsz) && !off) ||
347 (off && off < sizeof(struct icmp)))
348 fi->fi_fl |= FI_SHORT;
349
350 break;
351 }
352 case IPPROTO_TCP :
353 fi->fi_fl |= FI_TCPUDP;
354#ifdef USE_INET6
355 if (v == 6) {
356 if (plen < sizeof(struct tcphdr))
357 fi->fi_fl |= FI_SHORT;
358 } else
359#endif
360 if (v == 4) {
361 if ((!IPMINLEN(ip, tcphdr) && !off) ||
362 (off && off < sizeof(struct tcphdr)))
363 fi->fi_fl |= FI_SHORT;
364 }
365 if (!(fi->fi_fl & FI_SHORT) && !off)
366 fin->fin_tcpf = tcp->th_flags;
367 goto getports;
368 case IPPROTO_UDP :
369 fi->fi_fl |= FI_TCPUDP;
370#ifdef USE_INET6
371 if (v == 6) {
372 if (plen < sizeof(struct udphdr))
373 fi->fi_fl |= FI_SHORT;
374 } else
375#endif
376 if (v == 4) {
377 if ((!IPMINLEN(ip, udphdr) && !off) ||
378 (off && off < sizeof(struct udphdr)))
379 fi->fi_fl |= FI_SHORT;
380 }
381getports:
382 if (!off && (fin->fin_dlen > 3)) {
383 fin->fin_data[0] = ntohs(tcp->th_sport);
384 fin->fin_data[1] = ntohs(tcp->th_dport);
385 }
386 break;
387 case IPPROTO_ESP :
388#ifdef USE_INET6
389 if (v == 6) {
390 if (plen < 8)
391 fi->fi_fl |= FI_SHORT;
392 } else
393#endif
394 if (v == 4) {
395 if (((ip->ip_len < hlen + 8) && !off) ||
396 (off && off < 8))
397 fi->fi_fl |= FI_SHORT;
398 }
399 break;
400 default :
401 break;
402 }
403
404#ifdef USE_INET6
405 if (v == 6) {
406 fi->fi_optmsk = 0;
407 fi->fi_secmsk = 0;
408 fi->fi_auth = 0;
409 return;
410 }
411#endif
412
413 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
414 opt = *s;
415 if (opt == '\0')
416 break;
417 else if (opt == IPOPT_NOP)
418 ol = 1;
419 else {
420 if (hlen < 2)
421 break;
422 ol = (int)*(s + 1);
423 if (ol < 2 || ol > hlen)
424 break;
425 }
426 for (i = 9, mv = 4; mv >= 0; ) {
427 op = ipopts + i;
428 if (opt == (u_char)op->ol_val) {
429 optmsk |= op->ol_bit;
430 if (opt == IPOPT_SECURITY) {
431 struct optlist *sp;
432 u_char sec;
433 int j, m;
434
435 sec = *(s + 2); /* classification */
436 for (j = 3, m = 2; m >= 0; ) {
437 sp = secopt + j;
438 if (sec == sp->ol_val) {
439 secmsk |= sp->ol_bit;
440 auth = *(s + 3);
441 auth *= 256;
442 auth += *(s + 4);
443 break;
444 }
445 if (sec < sp->ol_val)
446 j -= m--;
447 else
448 j += m--;
449 }
450 }
451 break;
452 }
453 if (opt < op->ol_val)
454 i -= mv--;
455 else
456 i += mv--;
457 }
458 hlen -= ol;
459 s += ol;
460 }
461 if (auth && !(auth & 0x0100))
462 auth &= 0xff00;
463 fi->fi_optmsk = optmsk;
464 fi->fi_secmsk = secmsk;
465 fi->fi_auth = auth;
466}
467
468
469/*
470 * check an IP packet for TCP/UDP characteristics such as ports and flags.
471 */
472int fr_tcpudpchk(ft, fin)
473frtuc_t *ft;
474fr_info_t *fin;
475{
476 register u_short po, tup;
477 register char i;
478 register int err = 1;
479
480 /*
481 * Both ports should *always* be in the first fragment.
482 * So far, I cannot find any cases where they can not be.
483 *
484 * compare destination ports
485 */
486 if ((i = (int)ft->ftu_dcmp)) {
487 po = ft->ftu_dport;
488 tup = fin->fin_data[1];
489 /*
490 * Do opposite test to that required and
491 * continue if that succeeds.
492 */
493 if (!--i && tup != po) /* EQUAL */
494 err = 0;
495 else if (!--i && tup == po) /* NOTEQUAL */
496 err = 0;
497 else if (!--i && tup >= po) /* LESSTHAN */
498 err = 0;
499 else if (!--i && tup <= po) /* GREATERTHAN */
500 err = 0;
501 else if (!--i && tup > po) /* LT or EQ */
502 err = 0;
503 else if (!--i && tup < po) /* GT or EQ */
504 err = 0;
505 else if (!--i && /* Out of range */
506 (tup >= po && tup <= ft->ftu_dtop))
507 err = 0;
508 else if (!--i && /* In range */
509 (tup <= po || tup >= ft->ftu_dtop))
510 err = 0;
511 }
512 /*
513 * compare source ports
514 */
515 if (err && (i = (int)ft->ftu_scmp)) {
516 po = ft->ftu_sport;
517 tup = fin->fin_data[0];
518 if (!--i && tup != po)
519 err = 0;
520 else if (!--i && tup == po)
521 err = 0;
522 else if (!--i && tup >= po)
523 err = 0;
524 else if (!--i && tup <= po)
525 err = 0;
526 else if (!--i && tup > po)
527 err = 0;
528 else if (!--i && tup < po)
529 err = 0;
530 else if (!--i && /* Out of range */
531 (tup >= po && tup <= ft->ftu_stop))
532 err = 0;
533 else if (!--i && /* In range */
534 (tup <= po || tup >= ft->ftu_stop))
535 err = 0;
536 }
537
538 /*
539 * If we don't have all the TCP/UDP header, then how can we
540 * expect to do any sort of match on it ? If we were looking for
541 * TCP flags, then NO match. If not, then match (which should
542 * satisfy the "short" class too).
543 */
544 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
545 if (fin->fin_fl & FI_SHORT)
546 return !(ft->ftu_tcpf | ft->ftu_tcpfm);
547 /*
548 * Match the flags ? If not, abort this match.
549 */
550 if (ft->ftu_tcpfm &&
551 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) {
552 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
553 ft->ftu_tcpfm, ft->ftu_tcpf));
554 err = 0;
555 }
556 }
557 return err;
558}
559
560/*
561 * Check the input/output list of rules for a match and result.
562 * Could be per interface, but this gets real nasty when you don't have
563 * kernel sauce.
564 */
565int fr_scanlist(passin, ip, fin, m)
566u_32_t passin;
567ip_t *ip;
568register fr_info_t *fin;
569void *m;
570{
571 register struct frentry *fr;
572 register fr_ip_t *fi = &fin->fin_fi;
573 int rulen, portcmp = 0, off, skip = 0, logged = 0;
574 u_32_t pass, passt, passl;
575 frentry_t *frl;
576
577 frl = NULL;
578 pass = passin;
579 fr = fin->fin_fr;
580 fin->fin_fr = NULL;
581 off = fin->fin_off;
582
583 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
584 portcmp = 1;
585
586 for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
587 if (skip) {
588 FR_VERBOSE(("%d (%#x)\n", skip, fr->fr_flags));
589 skip--;
590 continue;
591 }
592 /*
593 * In all checks below, a null (zero) value in the
594 * filter struture is taken to mean a wildcard.
595 *
596 * check that we are working for the right interface
597 */
598#ifdef _KERNEL
599# if (BSD >= 199306)
600 if (fin->fin_out != 0) {
601 if ((fr->fr_oifa &&
602 (fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif)))
603 continue;
604 }
605# endif
606#else
607 if (opts & (OPT_VERBOSE|OPT_DEBUG))
608 printf("\n");
609#endif
610
611 FR_VERBOSE(("%c", fr->fr_skip ? 's' :
612 (pass & FR_PASS) ? 'p' :
613 (pass & FR_AUTH) ? 'a' :
614 (pass & FR_ACCOUNT) ? 'A' :
615 (pass & FR_NOMATCH) ? 'n' : 'b'));
616
617 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
618 continue;
619
620 FR_VERBOSE((":i"));
621 {
622 register u_32_t *ld, *lm, *lip;
623 register int i;
624
625 lip = (u_32_t *)fi;
626 lm = (u_32_t *)&fr->fr_mip;
627 ld = (u_32_t *)&fr->fr_ip;
628 i = ((*lip & *lm) != *ld);
629 FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
630 *lip, *lm, *ld));
631 if (i)
632 continue;
633 /*
634 * We now know whether the packet version and the
635 * rule version match, along with protocol, ttl and
636 * tos.
637 */
638 lip++, lm++, ld++;
639 /*
640 * Unrolled loops (4 each, for 32 bits).
641 */
642 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
643 *lip, *lm, *ld));
644 i |= ((*lip++ & *lm++) != *ld++) << 5;
645 if (fi->fi_v == 6) {
646 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
647 *lip, *lm, *ld));
648 i |= ((*lip++ & *lm++) != *ld++) << 5;
649 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
650 *lip, *lm, *ld));
651 i |= ((*lip++ & *lm++) != *ld++) << 5;
652 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
653 *lip, *lm, *ld));
654 i |= ((*lip++ & *lm++) != *ld++) << 5;
655 } else {
656 lip += 3;
657 lm += 3;
658 ld += 3;
659 }
660 i ^= (fr->fr_flags & FR_NOTSRCIP);
661 if (i)
662 continue;
663 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
664 *lip, *lm, *ld));
665 i |= ((*lip++ & *lm++) != *ld++) << 6;
666 if (fi->fi_v == 6) {
667 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
668 *lip, *lm, *ld));
669 i |= ((*lip++ & *lm++) != *ld++) << 6;
670 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
671 *lip, *lm, *ld));
672 i |= ((*lip++ & *lm++) != *ld++) << 6;
673 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
674 *lip, *lm, *ld));
675 i |= ((*lip++ & *lm++) != *ld++) << 6;
676 } else {
677 lip += 3;
678 lm += 3;
679 ld += 3;
680 }
681 i ^= (fr->fr_flags & FR_NOTDSTIP);
682 if (i)
683 continue;
684 FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
685 *lip, *lm, *ld));
686 i |= ((*lip++ & *lm++) != *ld++);
687 FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
688 *lip, *lm, *ld));
689 i |= ((*lip & *lm) != *ld);
690 if (i)
691 continue;
692 }
693
694 /*
695 * If a fragment, then only the first has what we're looking
696 * for here...
697 */
698 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
699 fr->fr_tcpfm))
700 continue;
701 if (fi->fi_fl & FI_TCPUDP) {
702 if (!fr_tcpudpchk(&fr->fr_tuc, fin))
703 continue;
704 } else if (fr->fr_icmpm || fr->fr_icmp) {
705 if ((fi->fi_p != IPPROTO_ICMP) || off ||
706 (fin->fin_dlen < 2))
707 continue;
708 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
709 FR_DEBUG(("i. %#x & %#x != %#x\n",
710 fin->fin_data[0], fr->fr_icmpm,
711 fr->fr_icmp));
712 continue;
713 }
714 }
715 FR_VERBOSE(("*"));
716
717 if (fr->fr_flags & FR_NOMATCH) {
718 passt = passl;
719 passl = passin;
720 fin->fin_fr = frl;
721 frl = NULL;
722 if (fr->fr_flags & FR_QUICK)
723 break;
724 continue;
725 }
726
727 passl = passt;
728 passt = fr->fr_flags;
729 frl = fin->fin_fr;
730 fin->fin_fr = fr;
731#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
732 if (securelevel <= 0)
733#endif
734 if ((passt & FR_CALLNOW) && fr->fr_func)
735 passt = (*fr->fr_func)(passt, ip, fin);
736#ifdef IPFILTER_LOG
737 /*
738 * Just log this packet...
739 */
740 if ((passt & FR_LOGMASK) == FR_LOG) {
741 if (!IPLLOG(passt, ip, fin, m)) {
742 if (passt & FR_LOGORBLOCK)
743 passt |= FR_BLOCK|FR_QUICK;
744 ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
745 }
746 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
747 logged = 1;
748 }
749#endif /* IPFILTER_LOG */
750 ATOMIC_INCL(fr->fr_hits);
751 if (passt & FR_ACCOUNT)
752 fr->fr_bytes += (U_QUAD_T)ip->ip_len;
753 else
754 fin->fin_icode = fr->fr_icode;
755 fin->fin_rule = rulen;
756 fin->fin_group = fr->fr_group;
757 if (fr->fr_grp != NULL) {
758 fin->fin_fr = fr->fr_grp;
759 passt = fr_scanlist(passt, ip, fin, m);
760 if (fin->fin_fr == NULL) {
761 fin->fin_rule = rulen;
762 fin->fin_group = fr->fr_group;
763 fin->fin_fr = fr;
764 }
765 if (passt & FR_DONTCACHE)
766 logged = 1;
767 }
768 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
769 pass = passt;
770 FR_DEBUG(("pass %#x\n", pass));
771 if (passt & FR_QUICK)
772 break;
773 }
774 if (logged)
775 pass |= FR_DONTCACHE;
776 pass |= (fi->fi_fl << 24);
777 return pass;
778}
779
780
781/*
782 * frcheck - filter check
783 * check using source and destination addresses/ports in a packet whether
784 * or not to pass it on or not.
785 */
786int fr_check(ip, hlen, ifp, out
787#if defined(_KERNEL) && SOLARIS
788, qif, mp)
789qif_t *qif;
790#else
791, mp)
792#endif
793mb_t **mp;
794ip_t *ip;
795int hlen;
796void *ifp;
797int out;
798{
799 /*
800 * The above really sucks, but short of writing a diff
801 */
802 fr_info_t frinfo, *fc;
803 register fr_info_t *fin = &frinfo;
804 int changed, error = EHOSTUNREACH, v = ip->ip_v;
805 frentry_t *fr = NULL, *list;
806 u_32_t pass, apass;
807#if !SOLARIS || !defined(_KERNEL)
808 register mb_t *m = *mp;
809#endif
810
811#ifdef _KERNEL
812 int p, len, drop = 0, logit = 0;
813 mb_t *mc = NULL;
814# if !defined(__SVR4) && !defined(__svr4__)
815# ifdef __sgi
816 char hbuf[128];
817# endif
818 int up;
819
820# ifdef M_CANFASTFWD
821 /*
822 * XXX For now, IP Filter and fast-forwarding of cached flows
823 * XXX are mutually exclusive. Eventually, IP Filter should
824 * XXX get a "can-fast-forward" filter rule.
825 */
826 m->m_flags &= ~M_CANFASTFWD;
827# endif /* M_CANFASTFWD */
828# ifdef CSUM_DELAY_DATA
829 /*
830 * disable delayed checksums.
831 */
832 if ((out != 0) && (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
833 in_delayed_cksum(m);
834 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
835 }
836# endif /* CSUM_DELAY_DATA */
837
838# ifdef USE_INET6
839 if (v == 6) {
840 len = ntohs(((ip6_t*)ip)->ip6_plen);
841 if (!len)
842 return -1; /* potential jumbo gram */
843 len += sizeof(ip6_t);
844 p = ((ip6_t *)ip)->ip6_nxt;
845 } else
846# endif
847 {
848 p = ip->ip_p;
849 len = ip->ip_len;
850 }
851
852 if ((p == IPPROTO_TCP || p == IPPROTO_UDP ||
853 (v == 4 && p == IPPROTO_ICMP)
854# ifdef USE_INET6
855 || (v == 6 && p == IPPROTO_ICMPV6)
856# endif
857 )) {
858 int plen = 0;
859
860 if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
861 switch(p)
862 {
863 case IPPROTO_TCP:
864 plen = sizeof(tcphdr_t);
865 break;
866 case IPPROTO_UDP:
867 plen = sizeof(udphdr_t);
868 break;
869 /* 96 - enough for complete ICMP error IP header */
870 case IPPROTO_ICMP:
871 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
872 break;
873 case IPPROTO_ESP:
874 plen = 8;
875 break;
876# ifdef USE_INET6
877 case IPPROTO_ICMPV6 :
878 /*
879 * XXX does not take intermediate header
880 * into account
881 */
882 plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
883 break;
884# endif
885 }
886 up = MIN(hlen + plen, len);
887
888 if (up > m->m_len) {
889# ifdef __sgi
890 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
891 if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
892 ATOMIC_INCL(frstats[out].fr_pull[1]);
893 return -1;
894 }
895 m_copydata(m, 0, up, hbuf);
896 ATOMIC_INCL(frstats[out].fr_pull[0]);
897 ip = (ip_t *)hbuf;
898# else /* __ sgi */
899# ifndef linux
900 if ((*mp = m_pullup(m, up)) == 0) {
901 ATOMIC_INCL(frstats[out].fr_pull[1]);
902 return -1;
903 } else {
904 ATOMIC_INCL(frstats[out].fr_pull[0]);
905 m = *mp;
906 ip = mtod(m, ip_t *);
907 }
908# endif /* !linux */
909# endif /* __sgi */
910 } else
911 up = 0;
912 } else
913 up = 0;
914# endif /* !defined(__SVR4) && !defined(__svr4__) */
915# if SOLARIS
916 mb_t *m = qif->qf_m;
917
918 if ((u_int)ip & 0x3)
919 return 2;
920 fin->fin_qfm = m;
921 fin->fin_qif = qif;
922# endif
923#endif /* _KERNEL */
924
925#ifndef __FreeBSD__
926 /*
927 * Be careful here: ip_id is in network byte order when called
928 * from ip_output()
929 */
930 if ((out) && (v == 4))
931 ip->ip_id = ntohs(ip->ip_id);
932#endif
933
934 changed = 0;
935 fin->fin_ifp = ifp;
936 fin->fin_v = v;
937 fin->fin_out = out;
938 fin->fin_mp = mp;
939 fr_makefrip(hlen, ip, fin);
940
941#ifdef _KERNEL
942# ifdef USE_INET6
943 if (v == 6) {
944 ATOMIC_INCL(frstats[0].fr_ipv6[out]);
945 if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
946 ATOMIC_INCL(frstats[0].fr_badttl);
947 if (fr_minttllog & 1)
948 logit = -3;
949 if (fr_minttllog & 2)
950 drop = 1;
951 }
952 } else
953# endif
954 if (!out) {
955 if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
956 ATOMIC_INCL(frstats[0].fr_badsrc);
957 if (fr_chksrc & 1)
958 drop = 1;
959 if (fr_chksrc & 2)
960 logit = -2;
961 } else if (ip->ip_ttl < fr_minttl) {
962 ATOMIC_INCL(frstats[0].fr_badttl);
963 if (fr_minttllog & 1)
964 logit = -3;
965 if (fr_minttllog & 2)
966 drop = 1;
967 }
968 }
969 if (drop) {
970# ifdef IPFILTER_LOG
971 if (logit) {
972 fin->fin_group = logit;
973 pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
974 (void) IPLLOG(pass, ip, fin, m);
975 }
976# endif
977# if !SOLARIS
978 m_freem(m);
979# endif
980 return error;
981 }
982#endif
983 pass = fr_pass;
984 if (fin->fin_fl & FI_SHORT) {
985 ATOMIC_INCL(frstats[out].fr_short);
986 }
987
988 READ_ENTER(&ipf_mutex);
989
990 /*
991 * Check auth now. This, combined with the check below to see if apass
992 * is 0 is to ensure that we don't count the packet twice, which can
993 * otherwise occur when we reprocess it. As it is, we only count it
994 * after it has no auth. table matchup. This also stops NAT from
995 * occuring until after the packet has been auth'd.
996 */
997 apass = fr_checkauth(ip, fin);
998
999 if (!out) {
1000#ifdef USE_INET6
1001 if (v == 6)
1002 list = ipacct6[0][fr_active];
1003 else
1004#endif
1005 list = ipacct[0][fr_active];
1006 changed = ip_natin(ip, fin);
1007 if (!apass && (fin->fin_fr = list) &&
1008 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
1009 ATOMIC_INCL(frstats[0].fr_acct);
1010 }
1011 }
1012
1013 if (!apass) {
1014 if ((fin->fin_fl & FI_FRAG) == FI_FRAG)
1015 fr = ipfr_knownfrag(ip, fin);
1016 if (!fr && !(fin->fin_fl & FI_SHORT))
1017 fr = fr_checkstate(ip, fin);
1018 if (fr != NULL)
1019 pass = fr->fr_flags;
1020 if (fr && (pass & FR_LOGFIRST))
1021 pass &= ~(FR_LOGFIRST|FR_LOG);
1022 }
1023
1024 if (apass || !fr) {
1025 /*
1026 * If a packet is found in the auth table, then skip checking
1027 * the access lists for permission but we do need to consider
1028 * the result as if it were from the ACL's.
1029 */
1030 if (!apass) {
1031 fc = frcache + out;
1032 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
1033 /*
1034 * copy cached data so we can unlock the mutex
1035 * earlier.
1036 */
1037 bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
1038 ATOMIC_INCL(frstats[out].fr_chit);
1039 if ((fr = fin->fin_fr)) {
1040 ATOMIC_INCL(fr->fr_hits);
1041 pass = fr->fr_flags;
1042 }
1043 } else {
1044#ifdef USE_INET6
1045 if (v == 6)
1046 list = ipfilter6[out][fr_active];
1047 else
1048#endif
1049 list = ipfilter[out][fr_active];
1050 if ((fin->fin_fr = list))
1051 pass = fr_scanlist(fr_pass, ip, fin, m);
1052 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
1053 bcopy((char *)fin, (char *)fc,
1054 FI_COPYSIZE);
1055 if (pass & FR_NOMATCH) {
1056 ATOMIC_INCL(frstats[out].fr_nom);
1057 fin->fin_fr = NULL;
1058 }
1059 }
1060 } else
1061 pass = apass;
1062 fr = fin->fin_fr;
1063
1064 /*
1065 * If we fail to add a packet to the authorization queue,
1066 * then we drop the packet later. However, if it was added
1067 * then pretend we've dropped it already.
1068 */
1069 if ((pass & FR_AUTH)) {
1070 if (fr_newauth((mb_t *)m, fin, ip) != 0) {
1071 m = *mp = NULL;
1072 error = 0;
1073 } else
1074 error = ENOSPC;
1075 }
1076
1077 if (pass & FR_PREAUTH) {
1078 READ_ENTER(&ipf_auth);
1079 if ((fin->fin_fr = ipauth) &&
1080 (pass = fr_scanlist(0, ip, fin, m))) {
1081 ATOMIC_INCL(fr_authstats.fas_hits);
1082 } else {
1083 ATOMIC_INCL(fr_authstats.fas_miss);
1084 }
1085 RWLOCK_EXIT(&ipf_auth);
1086 }
1087
1088 fin->fin_fr = fr;
1089 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
1090 if (fin->fin_fl & FI_FRAG) {
1091 if (ipfr_newfrag(ip, fin, pass) == -1) {
1092 ATOMIC_INCL(frstats[out].fr_bnfr);
1093 } else {
1094 ATOMIC_INCL(frstats[out].fr_nfr);
1095 }
1096 } else {
1097 ATOMIC_INCL(frstats[out].fr_cfr);
1098 }
1099 }
1100 if (pass & FR_KEEPSTATE) {
1101 if (fr_addstate(ip, fin, NULL, 0) == NULL) {
1102 ATOMIC_INCL(frstats[out].fr_bads);
1103 } else {
1104 ATOMIC_INCL(frstats[out].fr_ads);
1105 }
1106 }
1107 } else if (fr != NULL) {
1108 pass = fr->fr_flags;
1109 if (pass & FR_LOGFIRST)
1110 pass &= ~(FR_LOGFIRST|FR_LOG);
1111 }
1112
1113#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
1114 if (securelevel <= 0)
1115#endif
1116 if (fr && fr->fr_func && !(pass & FR_CALLNOW))
1117 pass = (*fr->fr_func)(pass, ip, fin);
1118
1119 /*
1120 * Only count/translate packets which will be passed on, out the
1121 * interface.
1122 */
1123 if (out && (pass & FR_PASS)) {
1124#ifdef USE_INET6
1125 if (v == 6)
1126 list = ipacct6[1][fr_active];
1127 else
1128#endif
1129 list = ipacct[1][fr_active];
1130 if (list != NULL) {
1131 u_32_t sg, sr;
1132
1133 fin->fin_fr = list;
1134 sg = fin->fin_group;
1135 sr = fin->fin_rule;
1136 if (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT) {
1137 ATOMIC_INCL(frstats[1].fr_acct);
1138 }
1139 fin->fin_group = sg;
1140 fin->fin_rule = sr;
1141 fin->fin_fr = fr;
1142 }
1143 changed = ip_natout(ip, fin);
1144 } else
1145 fin->fin_fr = fr;
1146 RWLOCK_EXIT(&ipf_mutex);
1147
1148#ifdef IPFILTER_LOG
1149 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
1150 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
1151 pass |= FF_LOGNOMATCH;
1152 ATOMIC_INCL(frstats[out].fr_npkl);
1153 goto logit;
1154 } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
1155 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
1156 if ((pass & FR_LOGMASK) != FR_LOGP)
1157 pass |= FF_LOGPASS;
1158 ATOMIC_INCL(frstats[out].fr_ppkl);
1159 goto logit;
1160 } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
1161 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
1162 if ((pass & FR_LOGMASK) != FR_LOGB)
1163 pass |= FF_LOGBLOCK;
1164 ATOMIC_INCL(frstats[out].fr_bpkl);
1165logit:
1166 if (!IPLLOG(pass, ip, fin, m)) {
1167 ATOMIC_INCL(frstats[out].fr_skip);
1168 if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
1169 (FR_PASS|FR_LOGORBLOCK))
1170 pass ^= FR_PASS|FR_BLOCK;
1171 }
1172 }
1173 }
1174#endif /* IPFILTER_LOG */
1175
1176#ifndef __FreeBSD__
1177 if ((out) && (v == 4))
1178 ip->ip_id = htons(ip->ip_id);
1179#endif
1180
1181#ifdef _KERNEL
1182 /*
1183 * Only allow FR_DUP to work if a rule matched - it makes no sense to
1184 * set FR_DUP as a "default" as there are no instructions about where
1185 * to send the packet.
1186 */
1187 if (fr && (pass & FR_DUP))
1188# if SOLARIS
1189 mc = dupmsg(m);
1190# else
1191# if defined(__OpenBSD__) && (OpenBSD >= 199905)
1192 mc = m_copym2(m, 0, M_COPYALL, M_DONTWAIT);
1193# else
1194 mc = m_copy(m, 0, M_COPYALL);
1195# endif
1196# endif
1197#endif
1198 if (pass & FR_PASS) {
1199 ATOMIC_INCL(frstats[out].fr_pass);
1200 } else if (pass & FR_BLOCK) {
1201 ATOMIC_INCL(frstats[out].fr_block);
1202 /*
1203 * Should we return an ICMP packet to indicate error
1204 * status passing through the packet filter ?
1205 * WARNING: ICMP error packets AND TCP RST packets should
1206 * ONLY be sent in repsonse to incoming packets. Sending them
1207 * in response to outbound packets can result in a panic on
1208 * some operating systems.
1209 */
1210 if (!out) {
1211 if (pass & FR_RETICMP) {
1212 int dst;
1213
1214 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1215 dst = 1;
1216 else
1217 dst = 0;
1218 send_icmp_err(ip, ICMP_UNREACH, fin, dst);
1219 ATOMIC_INCL(frstats[0].fr_ret);
1220 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1221 !(fin->fin_fl & FI_SHORT)) {
1222 if (send_reset(ip, fin) == 0) {
1223 ATOMIC_INCL(frstats[1].fr_ret);
1224 }
1225 }
1226 } else {
1227 if (pass & FR_RETRST)
1228 error = ECONNRESET;
1229 }
1230 }
1231
1232 /*
1233 * If we didn't drop off the bottom of the list of rules (and thus
1234 * the 'current' rule fr is not NULL), then we may have some extra
1235 * instructions about what to do with a packet.
1236 * Once we're finished return to our caller, freeing the packet if
1237 * we are dropping it (* BSD ONLY *).
1238 */
1239 if ((changed == -1) && (pass & FR_PASS)) {
1240 pass &= ~FR_PASS;
1241 pass |= FR_BLOCK;
1242 }
1243#if defined(_KERNEL)
1244# if !SOLARIS
1245# if !defined(linux)
1246 if (fr) {
1247 frdest_t *fdp = &fr->fr_tif;
1248
1249 if (((pass & FR_FASTROUTE) && !out) ||
1250 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1251 (void) ipfr_fastroute(m, mp, fin, fdp);
1252 m = *mp;
1253 }
1254
1255 if (mc != NULL)
1256 (void) ipfr_fastroute(mc, &mc, fin, &fr->fr_dif);
1257 }
1258
1259 if (!(pass & FR_PASS) && m) {
1260 m_freem(m);
1261 m = *mp = NULL;
1262 }
1263# ifdef __sgi
1264 else if (changed && up && m)
1265 m_copyback(m, 0, up, hbuf);
1266# endif
1267# endif /* !linux */
1268# else /* !SOLARIS */
1269 if (fr) {
1270 frdest_t *fdp = &fr->fr_tif;
1271
1272 if (((pass & FR_FASTROUTE) && !out) ||
1273 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1))
1274 (void) ipfr_fastroute(ip, m, mp, fin, fdp);
1275
1276 if (mc != NULL)
1277 (void) ipfr_fastroute(ip, mc, &mc, fin, &fr->fr_dif);
1278 }
1279# endif /* !SOLARIS */
1280 return (pass & FR_PASS) ? 0 : error;
1281#else /* _KERNEL */
1282 if (pass & FR_NOMATCH)
1283 return 1;
1284 if (pass & FR_PASS)
1285 return 0;
1286 if (pass & FR_AUTH)
1287 return -2;
1288 if ((pass & FR_RETMASK) == FR_RETRST)
1289 return -3;
1290 if ((pass & FR_RETMASK) == FR_RETICMP)
1291 return -4;
1292 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1293 return -5;
1294 return -1;
1295#endif /* _KERNEL */
1296}
1297
1298
1299/*
1300 * ipf_cksum
1301 * addr should be 16bit aligned and len is in bytes.
1302 * length is in bytes
1303 */
1304u_short ipf_cksum(addr, len)
1305register u_short *addr;
1306register int len;
1307{
1308 register u_32_t sum = 0;
1309
1310 for (sum = 0; len > 1; len -= 2)
1311 sum += *addr++;
1312
1313 /* mop up an odd byte, if necessary */
1314 if (len == 1)
1315 sum += *(u_char *)addr;
1316
1317 /*
1318 * add back carry outs from top 16 bits to low 16 bits
1319 */
1320 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1321 sum += (sum >> 16); /* add carry */
1322 return (u_short)(~sum);
1323}
1324
1325
1326/*
1327 * NB: This function assumes we've pullup'd enough for all of the IP header
1328 * and the TCP header. We also assume that data blocks aren't allocated in
1329 * odd sizes.
1330 */
1331u_short fr_tcpsum(m, ip, tcp)
1332mb_t *m;
1333ip_t *ip;
1334tcphdr_t *tcp;
1335{
1336 u_short *sp, slen, ts;
1337 u_int sum, sum2;
1338 int hlen;
1339
1340 /*
1341 * Add up IP Header portion
1342 */
1343 hlen = ip->ip_hl << 2;
1344 slen = ip->ip_len - hlen;
1345 sum = htons((u_short)ip->ip_p);
1346 sum += htons(slen);
1347 sp = (u_short *)&ip->ip_src;
1348 sum += *sp++; /* ip_src */
1349 sum += *sp++;
1350 sum += *sp++; /* ip_dst */
1351 sum += *sp++;
1352 ts = tcp->th_sum;
1353 tcp->th_sum = 0;
1354#ifdef KERNEL
1355# if SOLARIS
1356 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
1357 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1358 sum2 = ~sum2 & 0xffff;
1359# else /* SOLARIS */
1360# if defined(BSD) || defined(sun)
1361# if BSD >= 199306
1362 m->m_data += hlen;
1363# else
1364 m->m_off += hlen;
1365# endif
1366 m->m_len -= hlen;
1367 sum2 = in_cksum(m, slen);
1368 m->m_len += hlen;
1369# if BSD >= 199306
1370 m->m_data -= hlen;
1371# else
1372 m->m_off -= hlen;
1373# endif
1374 /*
1375 * Both sum and sum2 are partial sums, so combine them together.
1376 */
1377 sum = (sum & 0xffff) + (sum >> 16);
1378 sum = ~sum & 0xffff;
1379 sum2 += sum;
1380 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1381# else /* defined(BSD) || defined(sun) */
1382{
1383 union {
1384 u_char c[2];
1385 u_short s;
1386 } bytes;
1387 u_short len = ip->ip_len;
1388# if defined(__sgi)
1389 int add;
1390# endif
1391
1392 /*
1393 * Add up IP Header portion
1394 */
1395 sp = (u_short *)&ip->ip_src;
1396 len -= (ip->ip_hl << 2);
1397 sum = ntohs(IPPROTO_TCP);
1398 sum += htons(len);
1399 sum += *sp++; /* ip_src */
1400 sum += *sp++;
1401 sum += *sp++; /* ip_dst */
1402 sum += *sp++;
1403 if (sp != (u_short *)tcp)
1404 sp = (u_short *)tcp;
1405 sum += *sp++; /* sport */
1406 sum += *sp++; /* dport */
1407 sum += *sp++; /* seq */
1408 sum += *sp++;
1409 sum += *sp++; /* ack */
1410 sum += *sp++;
1411 sum += *sp++; /* off */
1412 sum += *sp++; /* win */
1413 sum += *sp++; /* Skip over checksum */
1414 sum += *sp++; /* urp */
1415
1416# ifdef __sgi
1417 /*
1418 * In case we had to copy the IP & TCP header out of mbufs,
1419 * skip over the mbuf bits which are the header
1420 */
1421 if ((caddr_t)ip != mtod(m, caddr_t)) {
1422 hlen = (caddr_t)sp - (caddr_t)ip;
1423 while (hlen) {
1424 add = MIN(hlen, m->m_len);
1425 sp = (u_short *)(mtod(m, caddr_t) + add);
1426 hlen -= add;
1427 if (add == m->m_len) {
1428 m = m->m_next;
1429 if (!hlen) {
1430 if (!m)
1431 break;
1432 sp = mtod(m, u_short *);
1433 }
1434 PANIC((!m),("fr_tcpsum(1): not enough data"));
1435 }
1436 }
1437 }
1438# endif
1439
1440 if (!(len -= sizeof(*tcp)))
1441 goto nodata;
1442 while (len > 1) {
1443 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
1444 m = m->m_next;
1445 PANIC((!m),("fr_tcpsum(2): not enough data"));
1446 sp = mtod(m, u_short *);
1447 }
1448 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
1449 bytes.c[0] = *(u_char *)sp;
1450 m = m->m_next;
1451 PANIC((!m),("fr_tcpsum(3): not enough data"));
1452 sp = mtod(m, u_short *);
1453 bytes.c[1] = *(u_char *)sp;
1454 sum += bytes.s;
1455 sp = (u_short *)((u_char *)sp + 1);
1456 }
1457 if ((u_long)sp & 1) {
1458 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
1459 sum += bytes.s;
1460 } else
1461 sum += *sp++;
1462 len -= 2;
1463 }
1464 if (len)
1465 sum += ntohs(*(u_char *)sp << 8);
1466nodata:
1467 while (sum > 0xffff)
1468 sum = (sum & 0xffff) + (sum >> 16);
1469 sum2 = (u_short)(~sum & 0xffff);
1470}
1471# endif /* defined(BSD) || defined(sun) */
1472# endif /* SOLARIS */
1473#else /* KERNEL */
1474 sum2 = 0;
1475#endif /* KERNEL */
1476 tcp->th_sum = ts;
1477 return sum2;
1478}
1479
1480
1481#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
1482/*
1483 * Copyright (c) 1982, 1986, 1988, 1991, 1993
1484 * The Regents of the University of California. All rights reserved.
1485 *
1486 * Redistribution and use in source and binary forms, with or without
1487 * modification, are permitted provided that the following conditions
1488 * are met:
1489 * 1. Redistributions of source code must retain the above copyright
1490 * notice, this list of conditions and the following disclaimer.
1491 * 2. Redistributions in binary form must reproduce the above copyright
1492 * notice, this list of conditions and the following disclaimer in the
1493 * documentation and/or other materials provided with the distribution.
1494 * 3. All advertising materials mentioning features or use of this software
1495 * must display the following acknowledgement:
1496 * This product includes software developed by the University of
1497 * California, Berkeley and its contributors.
1498 * 4. Neither the name of the University nor the names of its contributors
1499 * may be used to endorse or promote products derived from this software
1500 * without specific prior written permission.
1501 *
1502 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1503 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1504 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1505 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1506 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1507 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1508 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1509 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1510 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1511 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1512 * SUCH DAMAGE.
1513 *
1514 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
1515 * $Id: fil.c,v 2.35.2.58 2002/03/13 02:23:13 darrenr Exp $
1516 */
1517/*
1518 * Copy data from an mbuf chain starting "off" bytes from the beginning,
1519 * continuing for "len" bytes, into the indicated buffer.
1520 */
1521void
1522m_copydata(m, off, len, cp)
1523 register mb_t *m;
1524 register int off;
1525 register int len;
1526 caddr_t cp;
1527{
1528 register unsigned count;
1529
1530 if (off < 0 || len < 0)
1531 panic("m_copydata");
1532 while (off > 0) {
1533 if (m == 0)
1534 panic("m_copydata");
1535 if (off < m->m_len)
1536 break;
1537 off -= m->m_len;
1538 m = m->m_next;
1539 }
1540 while (len > 0) {
1541 if (m == 0)
1542 panic("m_copydata");
1543 count = MIN(m->m_len - off, len);
1544 bcopy(mtod(m, caddr_t) + off, cp, count);
1545 len -= count;
1546 cp += count;
1547 off = 0;
1548 m = m->m_next;
1549 }
1550}
1551
1552
1553# ifndef linux
1554/*
1555 * Copy data from a buffer back into the indicated mbuf chain,
1556 * starting "off" bytes from the beginning, extending the mbuf
1557 * chain if necessary.
1558 */
1559void
1560m_copyback(m0, off, len, cp)
1561 struct mbuf *m0;
1562 register int off;
1563 register int len;
1564 caddr_t cp;
1565{
1566 register int mlen;
1567 register struct mbuf *m = m0, *n;
1568 int totlen = 0;
1569
1570 if (m0 == 0)
1571 return;
1572 while (off > (mlen = m->m_len)) {
1573 off -= mlen;
1574 totlen += mlen;
1575 if (m->m_next == 0) {
1576 n = m_getclr(M_DONTWAIT, m->m_type);
1577 if (n == 0)
1578 goto out;
1579 n->m_len = min(MLEN, len + off);
1580 m->m_next = n;
1581 }
1582 m = m->m_next;
1583 }
1584 while (len > 0) {
1585 mlen = min (m->m_len - off, len);
1586 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
1587 cp += mlen;
1588 len -= mlen;
1589 mlen += off;
1590 off = 0;
1591 totlen += mlen;
1592 if (len == 0)
1593 break;
1594 if (m->m_next == 0) {
1595 n = m_get(M_DONTWAIT, m->m_type);
1596 if (n == 0)
1597 break;
1598 n->m_len = min(MLEN, len);
1599 m->m_next = n;
1600 }
1601 m = m->m_next;
1602 }
1603out:
1604#if 0
1605 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
1606 m->m_pkthdr.len = totlen;
1607#endif
1608 return;
1609}
1610# endif /* linux */
1611#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
1612
1613
1614frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
1615u_32_t num, flags;
1616minor_t which;
1617int set;
1618frgroup_t ***fgpp;
1619{
1620 frgroup_t *fg, **fgp;
1621
1622 if (which == IPL_LOGAUTH)
1623 fgp = &ipfgroups[2][set];
1624 else if (flags & FR_ACCOUNT)
1625 fgp = &ipfgroups[1][set];
1626 else if (flags & (FR_OUTQUE|FR_INQUE))
1627 fgp = &ipfgroups[0][set];
1628 else
1629 return NULL;
1630 num &= 0xffff;
1631
1632 while ((fg = *fgp))
1633 if (fg->fg_num == num)
1634 break;
1635 else
1636 fgp = &fg->fg_next;
1637 if (fgpp)
1638 *fgpp = fgp;
1639 return fg;
1640}
1641
1642
1643frgroup_t *fr_addgroup(num, fp, which, set)
1644u_32_t num;
1645frentry_t *fp;
1646minor_t which;
1647int set;
1648{
1649 frgroup_t *fg, **fgp;
1650
1651 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
1652 return fg;
1653
1654 KMALLOC(fg, frgroup_t *);
1655 if (fg) {
1656 fg->fg_num = num;
1657 fg->fg_next = *fgp;
1658 fg->fg_head = fp;
1659 fg->fg_start = &fp->fr_grp;
1660 *fgp = fg;
1661 }
1662 return fg;
1663}
1664
1665
1666void fr_delgroup(num, flags, which, set)
1667u_32_t num, flags;
1668minor_t which;
1669int set;
1670{
1671 frgroup_t *fg, **fgp;
1672
1673 if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
1674 return;
1675
1676 *fgp = fg->fg_next;
1677 KFREE(fg);
1678}
1679
1680
1681
1682/*
1683 * recursively flush rules from the list, descending groups as they are
1684 * encountered. if a rule is the head of a group and it has lost all its
1685 * group members, then also delete the group reference.
1686 */
1687static int frflushlist(set, unit, nfreedp, listp)
1688int set;
1689minor_t unit;
1690int *nfreedp;
1691frentry_t **listp;
1692{
1693 register int freed = 0, i;
1694 register frentry_t *fp;
1695
1696 while ((fp = *listp)) {
1697 *listp = fp->fr_next;
1698 if (fp->fr_grp) {
1699 i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
1700 MUTEX_ENTER(&ipf_rw);
1701 fp->fr_ref -= i;
1702 MUTEX_EXIT(&ipf_rw);
1703 }
1704
1705 ATOMIC_DEC32(fp->fr_ref);
1706 if (fp->fr_grhead) {
1707 fr_delgroup(fp->fr_grhead, fp->fr_flags,
1708 unit, set);
1709 fp->fr_grhead = 0;
1710 }
1711 if (fp->fr_ref == 0) {
1712 KFREE(fp);
1713 freed++;
1714 } else
1715 fp->fr_next = NULL;
1716 }
1717 *nfreedp += freed;
1718 return freed;
1719}
1720
1721
1722int frflush(unit, flags)
1723minor_t unit;
1724int flags;
1725{
1726 int flushed = 0, set;
1727
1728 if (unit != IPL_LOGIPF)
1729 return 0;
1730 WRITE_ENTER(&ipf_mutex);
1731 bzero((char *)frcache, sizeof(frcache[0]) * 2);
1732
1733 set = fr_active;
1734 if (flags & FR_INACTIVE)
1735 set = 1 - set;
1736
1737 if (flags & FR_OUTQUE) {
1738#ifdef USE_INET6
1739 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]);
1740 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]);
1741#endif
1742 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
1743 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
1744 }
1745 if (flags & FR_INQUE) {
1746#ifdef USE_INET6
1747 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]);
1748 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]);
1749#endif
1750 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
1751 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
1752 }
1753 RWLOCK_EXIT(&ipf_mutex);
1754 return flushed;
1755}
1756
1757
1758char *memstr(src, dst, slen, dlen)
1759char *src, *dst;
1760int slen, dlen;
1761{
1762 char *s = NULL;
1763
1764 while (dlen >= slen) {
1765 if (bcmp(src, dst, slen) == 0) {
1766 s = dst;
1767 break;
1768 }
1769 dst++;
1770 dlen--;
1771 }
1772 return s;
1773}
1774
1775
1776void fixskip(listp, rp, addremove)
1777frentry_t **listp, *rp;
1778int addremove;
1779{
1780 frentry_t *fp;
1781 int rules = 0, rn = 0;
1782
1783 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
1784 ;
1785
1786 if (!fp)
1787 return;
1788
1789 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
1790 if (fp->fr_skip && (rn + fp->fr_skip >= rules))
1791 fp->fr_skip += addremove;
1792}
1793
1794
1795#ifdef _KERNEL
1796/*
1797 * count consecutive 1's in bit mask. If the mask generated by counting
1798 * consecutive 1's is different to that passed, return -1, else return #
1799 * of bits.
1800 */
1801int countbits(ip)
1802u_32_t ip;
1803{
1804 u_32_t ipn;
1805 int cnt = 0, i, j;
1806
1807 ip = ipn = ntohl(ip);
1808 for (i = 32; i; i--, ipn *= 2)
1809 if (ipn & 0x80000000)
1810 cnt++;
1811 else
1812 break;
1813 ipn = 0;
1814 for (i = 32, j = cnt; i; i--, j--) {
1815 ipn *= 2;
1816 if (j > 0)
1817 ipn++;
1818 }
1819 if (ipn == ip)
1820 return cnt;
1821 return -1;
1822}
1823
1824
1825/*
1826 * return the first IP Address associated with an interface
1827 */
1828int fr_ifpaddr(v, ifptr, inp)
1829int v;
1830void *ifptr;
1831struct in_addr *inp;
1832{
1833# ifdef USE_INET6
1834 struct in6_addr *inp6 = NULL;
1835# endif
1836# if SOLARIS
1837 ill_t *ill = ifptr;
1838# else
1839 struct ifnet *ifp = ifptr;
1840# endif
1841 struct in_addr in;
1842
1843# if SOLARIS
1844# ifdef USE_INET6
1845 if (v == 6) {
1846 struct in6_addr in6;
1847
1848 /*
1849 * First is always link local.
1850 */
1851 if (ill->ill_ipif->ipif_next)
1852 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
1853 else
1854 bzero((char *)&in6, sizeof(in6));
1855 bcopy((char *)&in6, (char *)inp, sizeof(in6));
1856 } else
1857# endif
1858 {
1859 in.s_addr = ill->ill_ipif->ipif_local_addr;
1860 *inp = in;
1861 }
1862# else /* SOLARIS */
1863# if linux
1864 ;
1865# else /* linux */
1866 struct sockaddr_in *sin;
1867 struct ifaddr *ifa;
1868
1869# if (__FreeBSD_version >= 300000)
1870 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1871# else
1872# if defined(__NetBSD__) || defined(__OpenBSD__)
1873 ifa = ifp->if_addrlist.tqh_first;
1874# else
1875# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
1876 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
1877# else
1878 ifa = ifp->if_addrlist;
1879# endif
1880# endif /* __NetBSD__ || __OpenBSD__ */
1881# endif /* __FreeBSD_version >= 300000 */
1882# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
1883 sin = (struct sockaddr_in *)&ifa->ifa_addr;
1884# else
1885 sin = (struct sockaddr_in *)ifa->ifa_addr;
1886 while (sin && ifa) {
1887 if ((v == 4) && (sin->sin_family == AF_INET))
1888 break;
1889# ifdef USE_INET6
1890 if ((v == 6) && (sin->sin_family == AF_INET6)) {
1891 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
1892 if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
1893 !IN6_IS_ADDR_LOOPBACK(inp6))
1894 break;
1895 }
1896# endif
1897# if (__FreeBSD_version >= 300000)
1898 ifa = TAILQ_NEXT(ifa, ifa_link);
1899# else
1900# if defined(__NetBSD__) || defined(__OpenBSD__)
1901 ifa = ifa->ifa_list.tqe_next;
1902# else
1903 ifa = ifa->ifa_next;
1904# endif
1905# endif /* __FreeBSD_version >= 300000 */
1906 if (ifa)
1907 sin = (struct sockaddr_in *)ifa->ifa_addr;
1908 }
1909 if (ifa == NULL)
1910 sin = NULL;
1911 if (sin == NULL)
1912 return -1;
1913# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
1914# ifdef USE_INET6
1915 if (v == 6)
1916 bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
1917 else
1918# endif
1919 {
1920 in = sin->sin_addr;
1921 *inp = in;
1922 }
1923# endif /* linux */
1924# endif /* SOLARIS */
1925 return 0;
1926}
1927
1928
1929static void frsynclist(fr)
1930register frentry_t *fr;
1931{
1932 for (; fr; fr = fr->fr_next) {
1933 if (fr->fr_ifa != NULL) {
1934 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v);
1935 if (fr->fr_ifa == NULL)
1936 fr->fr_ifa = (void *)-1;
1937 }
1938 if (fr->fr_grp)
1939 frsynclist(fr->fr_grp);
1940 }
1941}
1942
1943
1944void frsync()
1945{
1946# if !SOLARIS
1947 register struct ifnet *ifp;
1948
1949# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
1950 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
1951# if (NetBSD >= 199905) || defined(__OpenBSD__)
1952 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
1953# else
1954 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
1955# endif
1956# else
1957 for (ifp = ifnet; ifp; ifp = ifp->if_next)
1958# endif
1959 {
1960 ip_natsync(ifp);
1961 ip_statesync(ifp);
1962 }
1963 ip_natsync((struct ifnet *)-1);
1964# endif /* !SOLARIS */
1965
1966 WRITE_ENTER(&ipf_mutex);
1967 frsynclist(ipacct[0][fr_active]);
1968 frsynclist(ipacct[1][fr_active]);
1969 frsynclist(ipfilter[0][fr_active]);
1970 frsynclist(ipfilter[1][fr_active]);
1971#ifdef USE_INET6
1972 frsynclist(ipacct6[0][fr_active]);
1973 frsynclist(ipacct6[1][fr_active]);
1974 frsynclist(ipfilter6[0][fr_active]);
1975 frsynclist(ipfilter6[1][fr_active]);
1976#endif
1977 RWLOCK_EXIT(&ipf_mutex);
1978}
1979
1980
1981/*
1982 * In the functions below, bcopy() is called because the pointer being
1983 * copied _from_ in this instance is a pointer to a char buf (which could
1984 * end up being unaligned) and on the kernel's local stack.
1985 */
1986int ircopyptr(a, b, c)
1987void *a, *b;
1988size_t c;
1989{
1990 caddr_t ca;
1991 int err;
1992
1993#if SOLARIS
1994 if (copyin(a, (char *)&ca, sizeof(ca)))
1995 return EFAULT;
1996#else
1997 bcopy(a, &ca, sizeof(ca));
1998#endif
1999 err = copyin(ca, b, c);
2000 if (err)
2001 err = EFAULT;
2002 return err;
2003}
2004
2005
2006int iwcopyptr(a, b, c)
2007void *a, *b;
2008size_t c;
2009{
2010 caddr_t ca;
2011 int err;
2012
2013#if SOLARIS
2014 if (copyin(b, (char *)&ca, sizeof(ca)))
2015 return EFAULT;
2016#else
2017 bcopy(b, &ca, sizeof(ca));
2018#endif
2019 err = copyout(a, ca, c);
2020 if (err)
2021 err = EFAULT;
2022 return err;
2023}
2024
2025#else /* _KERNEL */
2026
2027
2028/*
2029 * return the first IP Address associated with an interface
2030 */
2031int fr_ifpaddr(v, ifptr, inp)
2032int v;
2033void *ifptr;
2034struct in_addr *inp;
2035{
2036 return 0;
2037}
2038
2039
2040int ircopyptr(a, b, c)
2041void *a, *b;
2042size_t c;
2043{
2044 caddr_t ca;
2045
2046 bcopy(a, &ca, sizeof(ca));
2047 bcopy(ca, b, c);
2048 return 0;
2049}
2050
2051
2052int iwcopyptr(a, b, c)
2053void *a, *b;
2054size_t c;
2055{
2056 caddr_t ca;
2057
2058 bcopy(b, &ca, sizeof(ca));
2059 bcopy(a, ca, c);
2060 return 0;
2061}
2062
2063
2064#endif
2065
2066
2067int fr_lock(data, lockp)
2068caddr_t data;
2069int *lockp;
2070{
2071 int arg, error;
2072
2073 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
2074 if (!error) {
2075 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
2076 if (!error)
2077 *lockp = arg;
2078 }
2079 return error;
2080}
2081
2082
2083void fr_getstat(fiop)
2084friostat_t *fiop;
2085{
2086 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
2087 fiop->f_locks[0] = fr_state_lock;
2088 fiop->f_locks[1] = fr_nat_lock;
2089 fiop->f_locks[2] = fr_frag_lock;
2090 fiop->f_locks[3] = fr_auth_lock;
2091 fiop->f_fin[0] = ipfilter[0][0];
2092 fiop->f_fin[1] = ipfilter[0][1];
2093 fiop->f_fout[0] = ipfilter[1][0];
2094 fiop->f_fout[1] = ipfilter[1][1];
2095 fiop->f_acctin[0] = ipacct[0][0];
2096 fiop->f_acctin[1] = ipacct[0][1];
2097 fiop->f_acctout[0] = ipacct[1][0];
2098 fiop->f_acctout[1] = ipacct[1][1];
2099#ifdef USE_INET6
2100 fiop->f_fin6[0] = ipfilter6[0][0];
2101 fiop->f_fin6[1] = ipfilter6[0][1];
2102 fiop->f_fout6[0] = ipfilter6[1][0];
2103 fiop->f_fout6[1] = ipfilter6[1][1];
2104 fiop->f_acctin6[0] = ipacct6[0][0];
2105 fiop->f_acctin6[1] = ipacct6[0][1];
2106 fiop->f_acctout6[0] = ipacct6[1][0];
2107 fiop->f_acctout6[1] = ipacct6[1][1];
2108#else
2109 fiop->f_fin6[0] = NULL;
2110 fiop->f_fin6[1] = NULL;
2111 fiop->f_fout6[0] = NULL;
2112 fiop->f_fout6[1] = NULL;
2113 fiop->f_acctin6[0] = NULL;
2114 fiop->f_acctin6[1] = NULL;
2115 fiop->f_acctout6[0] = NULL;
2116 fiop->f_acctout6[1] = NULL;
2117#endif
2118 fiop->f_active = fr_active;
2119 fiop->f_froute[0] = ipl_frouteok[0];
2120 fiop->f_froute[1] = ipl_frouteok[1];
2121
2122 fiop->f_running = fr_running;
2123 fiop->f_groups[0][0] = ipfgroups[0][0];
2124 fiop->f_groups[0][1] = ipfgroups[0][1];
2125 fiop->f_groups[1][0] = ipfgroups[1][0];
2126 fiop->f_groups[1][1] = ipfgroups[1][1];
2127 fiop->f_groups[2][0] = ipfgroups[2][0];
2128 fiop->f_groups[2][1] = ipfgroups[2][1];
2129#ifdef IPFILTER_LOG
2130 fiop->f_logging = 1;
2131#else
2132 fiop->f_logging = 0;
2133#endif
2134 fiop->f_defpass = fr_pass;
2135 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version));
2136}
2137
2138
2139#ifdef USE_INET6
2140int icmptoicmp6types[ICMP_MAXTYPE+1] = {
2141 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
2142 -1, /* 1: UNUSED */
2143 -1, /* 2: UNUSED */
2144 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
2145 -1, /* 4: ICMP_SOURCEQUENCH */
2146 ND_REDIRECT, /* 5: ICMP_REDIRECT */
2147 -1, /* 6: UNUSED */
2148 -1, /* 7: UNUSED */
2149 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
2150 -1, /* 9: UNUSED */
2151 -1, /* 10: UNUSED */
2152 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
2153 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
2154 -1, /* 13: ICMP_TSTAMP */
2155 -1, /* 14: ICMP_TSTAMPREPLY */
2156 -1, /* 15: ICMP_IREQ */
2157 -1, /* 16: ICMP_IREQREPLY */
2158 -1, /* 17: ICMP_MASKREQ */
2159 -1, /* 18: ICMP_MASKREPLY */
2160};
2161
2162
2163int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
2164 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
2165 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
2166 -1, /* 2: ICMP_UNREACH_PROTOCOL */
2167 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
2168 -1, /* 4: ICMP_UNREACH_NEEDFRAG */
2169 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
2170 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
2171 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
2172 -1, /* 8: ICMP_UNREACH_ISOLATED */
2173 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
2174 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
2175 -1, /* 11: ICMP_UNREACH_TOSNET */
2176 -1, /* 12: ICMP_UNREACH_TOSHOST */
2177 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
2178};
2179#endif
2 * Copyright (C) 1993-2001 by Darren Reed.
3 *
4 * See the IPFILTER.LICENCE file for details on licencing.
5 */
6#ifdef __sgi
7# include <sys/ptimers.h>
8#endif
9#include <sys/errno.h>
10#include <sys/types.h>
11#include <sys/param.h>
12#include <sys/time.h>
13#include <sys/file.h>
14#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
15 defined(_KERNEL)
16# include "opt_ipfilter_log.h"
17#endif
18#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
19 (__FreeBSD_version >= 220000)
20# if (__FreeBSD_version >= 400000)
21# ifndef KLD_MODULE
22# include "opt_inet6.h"
23# endif
24# if (__FreeBSD_version == 400019)
25# define CSUM_DELAY_DATA
26# endif
27# endif
28# include <sys/filio.h>
29# include <sys/fcntl.h>
30#else
31# include <sys/ioctl.h>
32#endif
33#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
34# include <sys/systm.h>
35#else
36# include <stdio.h>
37# include <string.h>
38# include <stdlib.h>
39#endif
40#if !defined(__SVR4) && !defined(__svr4__)
41# ifndef linux
42# include <sys/mbuf.h>
43# endif
44#else
45# include <sys/byteorder.h>
46# if SOLARIS2 < 5
47# include <sys/dditypes.h>
48# endif
49# include <sys/stream.h>
50#endif
51#ifndef linux
52# include <sys/protosw.h>
53# include <sys/socket.h>
54#endif
55#include <net/if.h>
56#ifdef sun
57# include <net/af.h>
58#endif
59#include <net/route.h>
60#include <netinet/in.h>
61#include <netinet/in_systm.h>
62#include <netinet/ip.h>
63#ifndef linux
64# include <netinet/ip_var.h>
65#endif
66#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
67# include <sys/hashing.h>
68# include <netinet/in_var.h>
69#endif
70#include <netinet/tcp.h>
71#include <netinet/udp.h>
72#include <netinet/ip_icmp.h>
73#include "netinet/ip_compat.h"
74#ifdef USE_INET6
75# include <netinet/icmp6.h>
76# if !SOLARIS && defined(_KERNEL)
77# include <netinet6/in6_var.h>
78# endif
79#endif
80#include <netinet/tcpip.h>
81#include "netinet/ip_fil.h"
82#include "netinet/ip_nat.h"
83#include "netinet/ip_frag.h"
84#include "netinet/ip_state.h"
85#include "netinet/ip_proxy.h"
86#include "netinet/ip_auth.h"
87# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
88# include <sys/malloc.h>
89# if defined(_KERNEL) && !defined(IPFILTER_LKM)
90# include "opt_ipfilter.h"
91# endif
92# endif
93#ifndef MIN
94# define MIN(a,b) (((a)<(b))?(a):(b))
95#endif
96#include "netinet/ipl.h"
97
98#include <machine/in_cksum.h>
99
100#if !defined(lint)
101static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
102static const char rcsid[] = "@(#)$FreeBSD: head/sys/contrib/ipfilter/netinet/fil.c 92685 2002-03-19 11:44:16Z darrenr $";
103#endif
104
105#ifndef _KERNEL
106# include "ipf.h"
107# include "ipt.h"
108extern int opts;
109
110# define FR_VERBOSE(verb_pr) verbose verb_pr
111# define FR_DEBUG(verb_pr) debug verb_pr
112# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
113#else /* #ifndef _KERNEL */
114# define FR_VERBOSE(verb_pr)
115# define FR_DEBUG(verb_pr)
116# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
117# if SOLARIS || defined(__sgi)
118extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat;
119extern kmutex_t ipf_rw;
120# endif /* SOLARIS || __sgi */
121#endif /* _KERNEL */
122
123
124struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
125struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
126#ifdef USE_INET6
127 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
128 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
129#endif
130 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
131struct frgroup *ipfgroups[3][2];
132int fr_flags = IPF_LOGGING;
133int fr_active = 0;
134int fr_chksrc = 0;
135int fr_minttl = 3;
136int fr_minttllog = 1;
137#if defined(IPFILTER_DEFAULT_BLOCK)
138int fr_pass = FR_NOMATCH|FR_BLOCK;
139#else
140int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
141#endif
142char ipfilter_version[] = IPL_VERSION;
143
144fr_info_t frcache[2];
145
146static int frflushlist __P((int, minor_t, int *, frentry_t **));
147#ifdef _KERNEL
148static void frsynclist __P((frentry_t *));
149#endif
150
151
152/*
153 * bit values for identifying presence of individual IP options
154 */
155struct optlist ipopts[20] = {
156 { IPOPT_NOP, 0x000001 },
157 { IPOPT_RR, 0x000002 },
158 { IPOPT_ZSU, 0x000004 },
159 { IPOPT_MTUP, 0x000008 },
160 { IPOPT_MTUR, 0x000010 },
161 { IPOPT_ENCODE, 0x000020 },
162 { IPOPT_TS, 0x000040 },
163 { IPOPT_TR, 0x000080 },
164 { IPOPT_SECURITY, 0x000100 },
165 { IPOPT_LSRR, 0x000200 },
166 { IPOPT_E_SEC, 0x000400 },
167 { IPOPT_CIPSO, 0x000800 },
168 { IPOPT_SATID, 0x001000 },
169 { IPOPT_SSRR, 0x002000 },
170 { IPOPT_ADDEXT, 0x004000 },
171 { IPOPT_VISA, 0x008000 },
172 { IPOPT_IMITD, 0x010000 },
173 { IPOPT_EIP, 0x020000 },
174 { IPOPT_FINN, 0x040000 },
175 { 0, 0x000000 }
176};
177
178/*
179 * bit values for identifying presence of individual IP security options
180 */
181struct optlist secopt[8] = {
182 { IPSO_CLASS_RES4, 0x01 },
183 { IPSO_CLASS_TOPS, 0x02 },
184 { IPSO_CLASS_SECR, 0x04 },
185 { IPSO_CLASS_RES3, 0x08 },
186 { IPSO_CLASS_CONF, 0x10 },
187 { IPSO_CLASS_UNCL, 0x20 },
188 { IPSO_CLASS_RES2, 0x40 },
189 { IPSO_CLASS_RES1, 0x80 }
190};
191
192
193/*
194 * compact the IP header into a structure which contains just the info.
195 * which is useful for comparing IP headers with.
196 */
197void fr_makefrip(hlen, ip, fin)
198int hlen;
199ip_t *ip;
200fr_info_t *fin;
201{
202 u_short optmsk = 0, secmsk = 0, auth = 0;
203 int i, mv, ol, off, p, plen, v;
204 fr_ip_t *fi = &fin->fin_fi;
205 struct optlist *op;
206 u_char *s, opt;
207 tcphdr_t *tcp;
208
209 fin->fin_rev = 0;
210 fin->fin_fr = NULL;
211 fin->fin_tcpf = 0;
212 fin->fin_data[0] = 0;
213 fin->fin_data[1] = 0;
214 fin->fin_rule = -1;
215 fin->fin_group = -1;
216#ifdef _KERNEL
217 fin->fin_icode = ipl_unreach;
218#endif
219 v = fin->fin_v;
220 fi->fi_v = v;
221 fin->fin_hlen = hlen;
222 if (v == 4) {
223 fin->fin_id = ip->ip_id;
224 fi->fi_tos = ip->ip_tos;
225 off = (ip->ip_off & IP_OFFMASK);
226 tcp = (tcphdr_t *)((char *)ip + hlen);
227 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
228 fi->fi_src.i6[1] = 0;
229 fi->fi_src.i6[2] = 0;
230 fi->fi_src.i6[3] = 0;
231 fi->fi_dst.i6[1] = 0;
232 fi->fi_dst.i6[2] = 0;
233 fi->fi_dst.i6[3] = 0;
234 fi->fi_saddr = ip->ip_src.s_addr;
235 fi->fi_daddr = ip->ip_dst.s_addr;
236 p = ip->ip_p;
237 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
238 if (ip->ip_off & (IP_MF|IP_OFFMASK))
239 fi->fi_fl |= FI_FRAG;
240 plen = ip->ip_len;
241 fin->fin_dlen = plen - hlen;
242 }
243#ifdef USE_INET6
244 else if (v == 6) {
245 ip6_t *ip6 = (ip6_t *)ip;
246
247 off = 0;
248 p = ip6->ip6_nxt;
249 fi->fi_p = p;
250 fi->fi_ttl = ip6->ip6_hlim;
251 tcp = (tcphdr_t *)(ip6 + 1);
252 fi->fi_src.in6 = ip6->ip6_src;
253 fi->fi_dst.in6 = ip6->ip6_dst;
254 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
255 fi->fi_tos = 0;
256 fi->fi_fl = 0;
257 plen = ntohs(ip6->ip6_plen);
258 fin->fin_dlen = plen;
259 plen += sizeof(*ip6);
260 }
261#endif
262 else
263 return;
264
265 fin->fin_off = off;
266 fin->fin_plen = plen;
267 fin->fin_dp = (char *)tcp;
268 off <<= 3;
269
270 switch (p)
271 {
272#ifdef USE_INET6
273 case IPPROTO_ICMPV6 :
274 {
275 int minicmpsz = sizeof(struct icmp6_hdr);
276 struct icmp6_hdr *icmp6;
277
278 if (fin->fin_dlen > 1) {
279 fin->fin_data[0] = *(u_short *)tcp;
280
281 icmp6 = (struct icmp6_hdr *)tcp;
282
283 switch (icmp6->icmp6_type)
284 {
285 case ICMP6_ECHO_REPLY :
286 case ICMP6_ECHO_REQUEST :
287 minicmpsz = ICMP6_MINLEN;
288 break;
289 case ICMP6_DST_UNREACH :
290 case ICMP6_PACKET_TOO_BIG :
291 case ICMP6_TIME_EXCEEDED :
292 case ICMP6_PARAM_PROB :
293 minicmpsz = ICMP6ERR_IPICMPHLEN;
294 break;
295 default :
296 break;
297 }
298 }
299
300 if (!(plen >= hlen + minicmpsz))
301 fi->fi_fl |= FI_SHORT;
302
303 break;
304 }
305#endif
306 case IPPROTO_ICMP :
307 {
308 int minicmpsz = sizeof(struct icmp);
309 icmphdr_t *icmp;
310
311 if (!off && (fin->fin_dlen > 1)) {
312 fin->fin_data[0] = *(u_short *)tcp;
313
314 icmp = (icmphdr_t *)tcp;
315
316 switch (icmp->icmp_type)
317 {
318 case ICMP_ECHOREPLY :
319 case ICMP_ECHO :
320 /* Router discovery messages - RFC 1256 */
321 case ICMP_ROUTERADVERT :
322 case ICMP_ROUTERSOLICIT :
323 minicmpsz = ICMP_MINLEN;
324 break;
325 /*
326 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
327 * 3*timestamp(3*4)
328 */
329 case ICMP_TSTAMP :
330 case ICMP_TSTAMPREPLY :
331 minicmpsz = 20;
332 break;
333 /*
334 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
335 * mask(4)
336 */
337 case ICMP_MASKREQ :
338 case ICMP_MASKREPLY :
339 minicmpsz = 12;
340 break;
341 default :
342 break;
343 }
344 }
345
346 if ((!(plen >= hlen + minicmpsz) && !off) ||
347 (off && off < sizeof(struct icmp)))
348 fi->fi_fl |= FI_SHORT;
349
350 break;
351 }
352 case IPPROTO_TCP :
353 fi->fi_fl |= FI_TCPUDP;
354#ifdef USE_INET6
355 if (v == 6) {
356 if (plen < sizeof(struct tcphdr))
357 fi->fi_fl |= FI_SHORT;
358 } else
359#endif
360 if (v == 4) {
361 if ((!IPMINLEN(ip, tcphdr) && !off) ||
362 (off && off < sizeof(struct tcphdr)))
363 fi->fi_fl |= FI_SHORT;
364 }
365 if (!(fi->fi_fl & FI_SHORT) && !off)
366 fin->fin_tcpf = tcp->th_flags;
367 goto getports;
368 case IPPROTO_UDP :
369 fi->fi_fl |= FI_TCPUDP;
370#ifdef USE_INET6
371 if (v == 6) {
372 if (plen < sizeof(struct udphdr))
373 fi->fi_fl |= FI_SHORT;
374 } else
375#endif
376 if (v == 4) {
377 if ((!IPMINLEN(ip, udphdr) && !off) ||
378 (off && off < sizeof(struct udphdr)))
379 fi->fi_fl |= FI_SHORT;
380 }
381getports:
382 if (!off && (fin->fin_dlen > 3)) {
383 fin->fin_data[0] = ntohs(tcp->th_sport);
384 fin->fin_data[1] = ntohs(tcp->th_dport);
385 }
386 break;
387 case IPPROTO_ESP :
388#ifdef USE_INET6
389 if (v == 6) {
390 if (plen < 8)
391 fi->fi_fl |= FI_SHORT;
392 } else
393#endif
394 if (v == 4) {
395 if (((ip->ip_len < hlen + 8) && !off) ||
396 (off && off < 8))
397 fi->fi_fl |= FI_SHORT;
398 }
399 break;
400 default :
401 break;
402 }
403
404#ifdef USE_INET6
405 if (v == 6) {
406 fi->fi_optmsk = 0;
407 fi->fi_secmsk = 0;
408 fi->fi_auth = 0;
409 return;
410 }
411#endif
412
413 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
414 opt = *s;
415 if (opt == '\0')
416 break;
417 else if (opt == IPOPT_NOP)
418 ol = 1;
419 else {
420 if (hlen < 2)
421 break;
422 ol = (int)*(s + 1);
423 if (ol < 2 || ol > hlen)
424 break;
425 }
426 for (i = 9, mv = 4; mv >= 0; ) {
427 op = ipopts + i;
428 if (opt == (u_char)op->ol_val) {
429 optmsk |= op->ol_bit;
430 if (opt == IPOPT_SECURITY) {
431 struct optlist *sp;
432 u_char sec;
433 int j, m;
434
435 sec = *(s + 2); /* classification */
436 for (j = 3, m = 2; m >= 0; ) {
437 sp = secopt + j;
438 if (sec == sp->ol_val) {
439 secmsk |= sp->ol_bit;
440 auth = *(s + 3);
441 auth *= 256;
442 auth += *(s + 4);
443 break;
444 }
445 if (sec < sp->ol_val)
446 j -= m--;
447 else
448 j += m--;
449 }
450 }
451 break;
452 }
453 if (opt < op->ol_val)
454 i -= mv--;
455 else
456 i += mv--;
457 }
458 hlen -= ol;
459 s += ol;
460 }
461 if (auth && !(auth & 0x0100))
462 auth &= 0xff00;
463 fi->fi_optmsk = optmsk;
464 fi->fi_secmsk = secmsk;
465 fi->fi_auth = auth;
466}
467
468
469/*
470 * check an IP packet for TCP/UDP characteristics such as ports and flags.
471 */
472int fr_tcpudpchk(ft, fin)
473frtuc_t *ft;
474fr_info_t *fin;
475{
476 register u_short po, tup;
477 register char i;
478 register int err = 1;
479
480 /*
481 * Both ports should *always* be in the first fragment.
482 * So far, I cannot find any cases where they can not be.
483 *
484 * compare destination ports
485 */
486 if ((i = (int)ft->ftu_dcmp)) {
487 po = ft->ftu_dport;
488 tup = fin->fin_data[1];
489 /*
490 * Do opposite test to that required and
491 * continue if that succeeds.
492 */
493 if (!--i && tup != po) /* EQUAL */
494 err = 0;
495 else if (!--i && tup == po) /* NOTEQUAL */
496 err = 0;
497 else if (!--i && tup >= po) /* LESSTHAN */
498 err = 0;
499 else if (!--i && tup <= po) /* GREATERTHAN */
500 err = 0;
501 else if (!--i && tup > po) /* LT or EQ */
502 err = 0;
503 else if (!--i && tup < po) /* GT or EQ */
504 err = 0;
505 else if (!--i && /* Out of range */
506 (tup >= po && tup <= ft->ftu_dtop))
507 err = 0;
508 else if (!--i && /* In range */
509 (tup <= po || tup >= ft->ftu_dtop))
510 err = 0;
511 }
512 /*
513 * compare source ports
514 */
515 if (err && (i = (int)ft->ftu_scmp)) {
516 po = ft->ftu_sport;
517 tup = fin->fin_data[0];
518 if (!--i && tup != po)
519 err = 0;
520 else if (!--i && tup == po)
521 err = 0;
522 else if (!--i && tup >= po)
523 err = 0;
524 else if (!--i && tup <= po)
525 err = 0;
526 else if (!--i && tup > po)
527 err = 0;
528 else if (!--i && tup < po)
529 err = 0;
530 else if (!--i && /* Out of range */
531 (tup >= po && tup <= ft->ftu_stop))
532 err = 0;
533 else if (!--i && /* In range */
534 (tup <= po || tup >= ft->ftu_stop))
535 err = 0;
536 }
537
538 /*
539 * If we don't have all the TCP/UDP header, then how can we
540 * expect to do any sort of match on it ? If we were looking for
541 * TCP flags, then NO match. If not, then match (which should
542 * satisfy the "short" class too).
543 */
544 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
545 if (fin->fin_fl & FI_SHORT)
546 return !(ft->ftu_tcpf | ft->ftu_tcpfm);
547 /*
548 * Match the flags ? If not, abort this match.
549 */
550 if (ft->ftu_tcpfm &&
551 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) {
552 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
553 ft->ftu_tcpfm, ft->ftu_tcpf));
554 err = 0;
555 }
556 }
557 return err;
558}
559
560/*
561 * Check the input/output list of rules for a match and result.
562 * Could be per interface, but this gets real nasty when you don't have
563 * kernel sauce.
564 */
565int fr_scanlist(passin, ip, fin, m)
566u_32_t passin;
567ip_t *ip;
568register fr_info_t *fin;
569void *m;
570{
571 register struct frentry *fr;
572 register fr_ip_t *fi = &fin->fin_fi;
573 int rulen, portcmp = 0, off, skip = 0, logged = 0;
574 u_32_t pass, passt, passl;
575 frentry_t *frl;
576
577 frl = NULL;
578 pass = passin;
579 fr = fin->fin_fr;
580 fin->fin_fr = NULL;
581 off = fin->fin_off;
582
583 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
584 portcmp = 1;
585
586 for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
587 if (skip) {
588 FR_VERBOSE(("%d (%#x)\n", skip, fr->fr_flags));
589 skip--;
590 continue;
591 }
592 /*
593 * In all checks below, a null (zero) value in the
594 * filter struture is taken to mean a wildcard.
595 *
596 * check that we are working for the right interface
597 */
598#ifdef _KERNEL
599# if (BSD >= 199306)
600 if (fin->fin_out != 0) {
601 if ((fr->fr_oifa &&
602 (fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif)))
603 continue;
604 }
605# endif
606#else
607 if (opts & (OPT_VERBOSE|OPT_DEBUG))
608 printf("\n");
609#endif
610
611 FR_VERBOSE(("%c", fr->fr_skip ? 's' :
612 (pass & FR_PASS) ? 'p' :
613 (pass & FR_AUTH) ? 'a' :
614 (pass & FR_ACCOUNT) ? 'A' :
615 (pass & FR_NOMATCH) ? 'n' : 'b'));
616
617 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
618 continue;
619
620 FR_VERBOSE((":i"));
621 {
622 register u_32_t *ld, *lm, *lip;
623 register int i;
624
625 lip = (u_32_t *)fi;
626 lm = (u_32_t *)&fr->fr_mip;
627 ld = (u_32_t *)&fr->fr_ip;
628 i = ((*lip & *lm) != *ld);
629 FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
630 *lip, *lm, *ld));
631 if (i)
632 continue;
633 /*
634 * We now know whether the packet version and the
635 * rule version match, along with protocol, ttl and
636 * tos.
637 */
638 lip++, lm++, ld++;
639 /*
640 * Unrolled loops (4 each, for 32 bits).
641 */
642 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
643 *lip, *lm, *ld));
644 i |= ((*lip++ & *lm++) != *ld++) << 5;
645 if (fi->fi_v == 6) {
646 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
647 *lip, *lm, *ld));
648 i |= ((*lip++ & *lm++) != *ld++) << 5;
649 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
650 *lip, *lm, *ld));
651 i |= ((*lip++ & *lm++) != *ld++) << 5;
652 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
653 *lip, *lm, *ld));
654 i |= ((*lip++ & *lm++) != *ld++) << 5;
655 } else {
656 lip += 3;
657 lm += 3;
658 ld += 3;
659 }
660 i ^= (fr->fr_flags & FR_NOTSRCIP);
661 if (i)
662 continue;
663 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
664 *lip, *lm, *ld));
665 i |= ((*lip++ & *lm++) != *ld++) << 6;
666 if (fi->fi_v == 6) {
667 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
668 *lip, *lm, *ld));
669 i |= ((*lip++ & *lm++) != *ld++) << 6;
670 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
671 *lip, *lm, *ld));
672 i |= ((*lip++ & *lm++) != *ld++) << 6;
673 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
674 *lip, *lm, *ld));
675 i |= ((*lip++ & *lm++) != *ld++) << 6;
676 } else {
677 lip += 3;
678 lm += 3;
679 ld += 3;
680 }
681 i ^= (fr->fr_flags & FR_NOTDSTIP);
682 if (i)
683 continue;
684 FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
685 *lip, *lm, *ld));
686 i |= ((*lip++ & *lm++) != *ld++);
687 FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
688 *lip, *lm, *ld));
689 i |= ((*lip & *lm) != *ld);
690 if (i)
691 continue;
692 }
693
694 /*
695 * If a fragment, then only the first has what we're looking
696 * for here...
697 */
698 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
699 fr->fr_tcpfm))
700 continue;
701 if (fi->fi_fl & FI_TCPUDP) {
702 if (!fr_tcpudpchk(&fr->fr_tuc, fin))
703 continue;
704 } else if (fr->fr_icmpm || fr->fr_icmp) {
705 if ((fi->fi_p != IPPROTO_ICMP) || off ||
706 (fin->fin_dlen < 2))
707 continue;
708 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
709 FR_DEBUG(("i. %#x & %#x != %#x\n",
710 fin->fin_data[0], fr->fr_icmpm,
711 fr->fr_icmp));
712 continue;
713 }
714 }
715 FR_VERBOSE(("*"));
716
717 if (fr->fr_flags & FR_NOMATCH) {
718 passt = passl;
719 passl = passin;
720 fin->fin_fr = frl;
721 frl = NULL;
722 if (fr->fr_flags & FR_QUICK)
723 break;
724 continue;
725 }
726
727 passl = passt;
728 passt = fr->fr_flags;
729 frl = fin->fin_fr;
730 fin->fin_fr = fr;
731#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
732 if (securelevel <= 0)
733#endif
734 if ((passt & FR_CALLNOW) && fr->fr_func)
735 passt = (*fr->fr_func)(passt, ip, fin);
736#ifdef IPFILTER_LOG
737 /*
738 * Just log this packet...
739 */
740 if ((passt & FR_LOGMASK) == FR_LOG) {
741 if (!IPLLOG(passt, ip, fin, m)) {
742 if (passt & FR_LOGORBLOCK)
743 passt |= FR_BLOCK|FR_QUICK;
744 ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
745 }
746 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
747 logged = 1;
748 }
749#endif /* IPFILTER_LOG */
750 ATOMIC_INCL(fr->fr_hits);
751 if (passt & FR_ACCOUNT)
752 fr->fr_bytes += (U_QUAD_T)ip->ip_len;
753 else
754 fin->fin_icode = fr->fr_icode;
755 fin->fin_rule = rulen;
756 fin->fin_group = fr->fr_group;
757 if (fr->fr_grp != NULL) {
758 fin->fin_fr = fr->fr_grp;
759 passt = fr_scanlist(passt, ip, fin, m);
760 if (fin->fin_fr == NULL) {
761 fin->fin_rule = rulen;
762 fin->fin_group = fr->fr_group;
763 fin->fin_fr = fr;
764 }
765 if (passt & FR_DONTCACHE)
766 logged = 1;
767 }
768 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
769 pass = passt;
770 FR_DEBUG(("pass %#x\n", pass));
771 if (passt & FR_QUICK)
772 break;
773 }
774 if (logged)
775 pass |= FR_DONTCACHE;
776 pass |= (fi->fi_fl << 24);
777 return pass;
778}
779
780
781/*
782 * frcheck - filter check
783 * check using source and destination addresses/ports in a packet whether
784 * or not to pass it on or not.
785 */
786int fr_check(ip, hlen, ifp, out
787#if defined(_KERNEL) && SOLARIS
788, qif, mp)
789qif_t *qif;
790#else
791, mp)
792#endif
793mb_t **mp;
794ip_t *ip;
795int hlen;
796void *ifp;
797int out;
798{
799 /*
800 * The above really sucks, but short of writing a diff
801 */
802 fr_info_t frinfo, *fc;
803 register fr_info_t *fin = &frinfo;
804 int changed, error = EHOSTUNREACH, v = ip->ip_v;
805 frentry_t *fr = NULL, *list;
806 u_32_t pass, apass;
807#if !SOLARIS || !defined(_KERNEL)
808 register mb_t *m = *mp;
809#endif
810
811#ifdef _KERNEL
812 int p, len, drop = 0, logit = 0;
813 mb_t *mc = NULL;
814# if !defined(__SVR4) && !defined(__svr4__)
815# ifdef __sgi
816 char hbuf[128];
817# endif
818 int up;
819
820# ifdef M_CANFASTFWD
821 /*
822 * XXX For now, IP Filter and fast-forwarding of cached flows
823 * XXX are mutually exclusive. Eventually, IP Filter should
824 * XXX get a "can-fast-forward" filter rule.
825 */
826 m->m_flags &= ~M_CANFASTFWD;
827# endif /* M_CANFASTFWD */
828# ifdef CSUM_DELAY_DATA
829 /*
830 * disable delayed checksums.
831 */
832 if ((out != 0) && (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
833 in_delayed_cksum(m);
834 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
835 }
836# endif /* CSUM_DELAY_DATA */
837
838# ifdef USE_INET6
839 if (v == 6) {
840 len = ntohs(((ip6_t*)ip)->ip6_plen);
841 if (!len)
842 return -1; /* potential jumbo gram */
843 len += sizeof(ip6_t);
844 p = ((ip6_t *)ip)->ip6_nxt;
845 } else
846# endif
847 {
848 p = ip->ip_p;
849 len = ip->ip_len;
850 }
851
852 if ((p == IPPROTO_TCP || p == IPPROTO_UDP ||
853 (v == 4 && p == IPPROTO_ICMP)
854# ifdef USE_INET6
855 || (v == 6 && p == IPPROTO_ICMPV6)
856# endif
857 )) {
858 int plen = 0;
859
860 if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
861 switch(p)
862 {
863 case IPPROTO_TCP:
864 plen = sizeof(tcphdr_t);
865 break;
866 case IPPROTO_UDP:
867 plen = sizeof(udphdr_t);
868 break;
869 /* 96 - enough for complete ICMP error IP header */
870 case IPPROTO_ICMP:
871 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
872 break;
873 case IPPROTO_ESP:
874 plen = 8;
875 break;
876# ifdef USE_INET6
877 case IPPROTO_ICMPV6 :
878 /*
879 * XXX does not take intermediate header
880 * into account
881 */
882 plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
883 break;
884# endif
885 }
886 up = MIN(hlen + plen, len);
887
888 if (up > m->m_len) {
889# ifdef __sgi
890 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
891 if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
892 ATOMIC_INCL(frstats[out].fr_pull[1]);
893 return -1;
894 }
895 m_copydata(m, 0, up, hbuf);
896 ATOMIC_INCL(frstats[out].fr_pull[0]);
897 ip = (ip_t *)hbuf;
898# else /* __ sgi */
899# ifndef linux
900 if ((*mp = m_pullup(m, up)) == 0) {
901 ATOMIC_INCL(frstats[out].fr_pull[1]);
902 return -1;
903 } else {
904 ATOMIC_INCL(frstats[out].fr_pull[0]);
905 m = *mp;
906 ip = mtod(m, ip_t *);
907 }
908# endif /* !linux */
909# endif /* __sgi */
910 } else
911 up = 0;
912 } else
913 up = 0;
914# endif /* !defined(__SVR4) && !defined(__svr4__) */
915# if SOLARIS
916 mb_t *m = qif->qf_m;
917
918 if ((u_int)ip & 0x3)
919 return 2;
920 fin->fin_qfm = m;
921 fin->fin_qif = qif;
922# endif
923#endif /* _KERNEL */
924
925#ifndef __FreeBSD__
926 /*
927 * Be careful here: ip_id is in network byte order when called
928 * from ip_output()
929 */
930 if ((out) && (v == 4))
931 ip->ip_id = ntohs(ip->ip_id);
932#endif
933
934 changed = 0;
935 fin->fin_ifp = ifp;
936 fin->fin_v = v;
937 fin->fin_out = out;
938 fin->fin_mp = mp;
939 fr_makefrip(hlen, ip, fin);
940
941#ifdef _KERNEL
942# ifdef USE_INET6
943 if (v == 6) {
944 ATOMIC_INCL(frstats[0].fr_ipv6[out]);
945 if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
946 ATOMIC_INCL(frstats[0].fr_badttl);
947 if (fr_minttllog & 1)
948 logit = -3;
949 if (fr_minttllog & 2)
950 drop = 1;
951 }
952 } else
953# endif
954 if (!out) {
955 if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
956 ATOMIC_INCL(frstats[0].fr_badsrc);
957 if (fr_chksrc & 1)
958 drop = 1;
959 if (fr_chksrc & 2)
960 logit = -2;
961 } else if (ip->ip_ttl < fr_minttl) {
962 ATOMIC_INCL(frstats[0].fr_badttl);
963 if (fr_minttllog & 1)
964 logit = -3;
965 if (fr_minttllog & 2)
966 drop = 1;
967 }
968 }
969 if (drop) {
970# ifdef IPFILTER_LOG
971 if (logit) {
972 fin->fin_group = logit;
973 pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
974 (void) IPLLOG(pass, ip, fin, m);
975 }
976# endif
977# if !SOLARIS
978 m_freem(m);
979# endif
980 return error;
981 }
982#endif
983 pass = fr_pass;
984 if (fin->fin_fl & FI_SHORT) {
985 ATOMIC_INCL(frstats[out].fr_short);
986 }
987
988 READ_ENTER(&ipf_mutex);
989
990 /*
991 * Check auth now. This, combined with the check below to see if apass
992 * is 0 is to ensure that we don't count the packet twice, which can
993 * otherwise occur when we reprocess it. As it is, we only count it
994 * after it has no auth. table matchup. This also stops NAT from
995 * occuring until after the packet has been auth'd.
996 */
997 apass = fr_checkauth(ip, fin);
998
999 if (!out) {
1000#ifdef USE_INET6
1001 if (v == 6)
1002 list = ipacct6[0][fr_active];
1003 else
1004#endif
1005 list = ipacct[0][fr_active];
1006 changed = ip_natin(ip, fin);
1007 if (!apass && (fin->fin_fr = list) &&
1008 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
1009 ATOMIC_INCL(frstats[0].fr_acct);
1010 }
1011 }
1012
1013 if (!apass) {
1014 if ((fin->fin_fl & FI_FRAG) == FI_FRAG)
1015 fr = ipfr_knownfrag(ip, fin);
1016 if (!fr && !(fin->fin_fl & FI_SHORT))
1017 fr = fr_checkstate(ip, fin);
1018 if (fr != NULL)
1019 pass = fr->fr_flags;
1020 if (fr && (pass & FR_LOGFIRST))
1021 pass &= ~(FR_LOGFIRST|FR_LOG);
1022 }
1023
1024 if (apass || !fr) {
1025 /*
1026 * If a packet is found in the auth table, then skip checking
1027 * the access lists for permission but we do need to consider
1028 * the result as if it were from the ACL's.
1029 */
1030 if (!apass) {
1031 fc = frcache + out;
1032 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
1033 /*
1034 * copy cached data so we can unlock the mutex
1035 * earlier.
1036 */
1037 bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
1038 ATOMIC_INCL(frstats[out].fr_chit);
1039 if ((fr = fin->fin_fr)) {
1040 ATOMIC_INCL(fr->fr_hits);
1041 pass = fr->fr_flags;
1042 }
1043 } else {
1044#ifdef USE_INET6
1045 if (v == 6)
1046 list = ipfilter6[out][fr_active];
1047 else
1048#endif
1049 list = ipfilter[out][fr_active];
1050 if ((fin->fin_fr = list))
1051 pass = fr_scanlist(fr_pass, ip, fin, m);
1052 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
1053 bcopy((char *)fin, (char *)fc,
1054 FI_COPYSIZE);
1055 if (pass & FR_NOMATCH) {
1056 ATOMIC_INCL(frstats[out].fr_nom);
1057 fin->fin_fr = NULL;
1058 }
1059 }
1060 } else
1061 pass = apass;
1062 fr = fin->fin_fr;
1063
1064 /*
1065 * If we fail to add a packet to the authorization queue,
1066 * then we drop the packet later. However, if it was added
1067 * then pretend we've dropped it already.
1068 */
1069 if ((pass & FR_AUTH)) {
1070 if (fr_newauth((mb_t *)m, fin, ip) != 0) {
1071 m = *mp = NULL;
1072 error = 0;
1073 } else
1074 error = ENOSPC;
1075 }
1076
1077 if (pass & FR_PREAUTH) {
1078 READ_ENTER(&ipf_auth);
1079 if ((fin->fin_fr = ipauth) &&
1080 (pass = fr_scanlist(0, ip, fin, m))) {
1081 ATOMIC_INCL(fr_authstats.fas_hits);
1082 } else {
1083 ATOMIC_INCL(fr_authstats.fas_miss);
1084 }
1085 RWLOCK_EXIT(&ipf_auth);
1086 }
1087
1088 fin->fin_fr = fr;
1089 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
1090 if (fin->fin_fl & FI_FRAG) {
1091 if (ipfr_newfrag(ip, fin, pass) == -1) {
1092 ATOMIC_INCL(frstats[out].fr_bnfr);
1093 } else {
1094 ATOMIC_INCL(frstats[out].fr_nfr);
1095 }
1096 } else {
1097 ATOMIC_INCL(frstats[out].fr_cfr);
1098 }
1099 }
1100 if (pass & FR_KEEPSTATE) {
1101 if (fr_addstate(ip, fin, NULL, 0) == NULL) {
1102 ATOMIC_INCL(frstats[out].fr_bads);
1103 } else {
1104 ATOMIC_INCL(frstats[out].fr_ads);
1105 }
1106 }
1107 } else if (fr != NULL) {
1108 pass = fr->fr_flags;
1109 if (pass & FR_LOGFIRST)
1110 pass &= ~(FR_LOGFIRST|FR_LOG);
1111 }
1112
1113#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
1114 if (securelevel <= 0)
1115#endif
1116 if (fr && fr->fr_func && !(pass & FR_CALLNOW))
1117 pass = (*fr->fr_func)(pass, ip, fin);
1118
1119 /*
1120 * Only count/translate packets which will be passed on, out the
1121 * interface.
1122 */
1123 if (out && (pass & FR_PASS)) {
1124#ifdef USE_INET6
1125 if (v == 6)
1126 list = ipacct6[1][fr_active];
1127 else
1128#endif
1129 list = ipacct[1][fr_active];
1130 if (list != NULL) {
1131 u_32_t sg, sr;
1132
1133 fin->fin_fr = list;
1134 sg = fin->fin_group;
1135 sr = fin->fin_rule;
1136 if (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT) {
1137 ATOMIC_INCL(frstats[1].fr_acct);
1138 }
1139 fin->fin_group = sg;
1140 fin->fin_rule = sr;
1141 fin->fin_fr = fr;
1142 }
1143 changed = ip_natout(ip, fin);
1144 } else
1145 fin->fin_fr = fr;
1146 RWLOCK_EXIT(&ipf_mutex);
1147
1148#ifdef IPFILTER_LOG
1149 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
1150 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
1151 pass |= FF_LOGNOMATCH;
1152 ATOMIC_INCL(frstats[out].fr_npkl);
1153 goto logit;
1154 } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
1155 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
1156 if ((pass & FR_LOGMASK) != FR_LOGP)
1157 pass |= FF_LOGPASS;
1158 ATOMIC_INCL(frstats[out].fr_ppkl);
1159 goto logit;
1160 } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
1161 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
1162 if ((pass & FR_LOGMASK) != FR_LOGB)
1163 pass |= FF_LOGBLOCK;
1164 ATOMIC_INCL(frstats[out].fr_bpkl);
1165logit:
1166 if (!IPLLOG(pass, ip, fin, m)) {
1167 ATOMIC_INCL(frstats[out].fr_skip);
1168 if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
1169 (FR_PASS|FR_LOGORBLOCK))
1170 pass ^= FR_PASS|FR_BLOCK;
1171 }
1172 }
1173 }
1174#endif /* IPFILTER_LOG */
1175
1176#ifndef __FreeBSD__
1177 if ((out) && (v == 4))
1178 ip->ip_id = htons(ip->ip_id);
1179#endif
1180
1181#ifdef _KERNEL
1182 /*
1183 * Only allow FR_DUP to work if a rule matched - it makes no sense to
1184 * set FR_DUP as a "default" as there are no instructions about where
1185 * to send the packet.
1186 */
1187 if (fr && (pass & FR_DUP))
1188# if SOLARIS
1189 mc = dupmsg(m);
1190# else
1191# if defined(__OpenBSD__) && (OpenBSD >= 199905)
1192 mc = m_copym2(m, 0, M_COPYALL, M_DONTWAIT);
1193# else
1194 mc = m_copy(m, 0, M_COPYALL);
1195# endif
1196# endif
1197#endif
1198 if (pass & FR_PASS) {
1199 ATOMIC_INCL(frstats[out].fr_pass);
1200 } else if (pass & FR_BLOCK) {
1201 ATOMIC_INCL(frstats[out].fr_block);
1202 /*
1203 * Should we return an ICMP packet to indicate error
1204 * status passing through the packet filter ?
1205 * WARNING: ICMP error packets AND TCP RST packets should
1206 * ONLY be sent in repsonse to incoming packets. Sending them
1207 * in response to outbound packets can result in a panic on
1208 * some operating systems.
1209 */
1210 if (!out) {
1211 if (pass & FR_RETICMP) {
1212 int dst;
1213
1214 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1215 dst = 1;
1216 else
1217 dst = 0;
1218 send_icmp_err(ip, ICMP_UNREACH, fin, dst);
1219 ATOMIC_INCL(frstats[0].fr_ret);
1220 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1221 !(fin->fin_fl & FI_SHORT)) {
1222 if (send_reset(ip, fin) == 0) {
1223 ATOMIC_INCL(frstats[1].fr_ret);
1224 }
1225 }
1226 } else {
1227 if (pass & FR_RETRST)
1228 error = ECONNRESET;
1229 }
1230 }
1231
1232 /*
1233 * If we didn't drop off the bottom of the list of rules (and thus
1234 * the 'current' rule fr is not NULL), then we may have some extra
1235 * instructions about what to do with a packet.
1236 * Once we're finished return to our caller, freeing the packet if
1237 * we are dropping it (* BSD ONLY *).
1238 */
1239 if ((changed == -1) && (pass & FR_PASS)) {
1240 pass &= ~FR_PASS;
1241 pass |= FR_BLOCK;
1242 }
1243#if defined(_KERNEL)
1244# if !SOLARIS
1245# if !defined(linux)
1246 if (fr) {
1247 frdest_t *fdp = &fr->fr_tif;
1248
1249 if (((pass & FR_FASTROUTE) && !out) ||
1250 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1251 (void) ipfr_fastroute(m, mp, fin, fdp);
1252 m = *mp;
1253 }
1254
1255 if (mc != NULL)
1256 (void) ipfr_fastroute(mc, &mc, fin, &fr->fr_dif);
1257 }
1258
1259 if (!(pass & FR_PASS) && m) {
1260 m_freem(m);
1261 m = *mp = NULL;
1262 }
1263# ifdef __sgi
1264 else if (changed && up && m)
1265 m_copyback(m, 0, up, hbuf);
1266# endif
1267# endif /* !linux */
1268# else /* !SOLARIS */
1269 if (fr) {
1270 frdest_t *fdp = &fr->fr_tif;
1271
1272 if (((pass & FR_FASTROUTE) && !out) ||
1273 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1))
1274 (void) ipfr_fastroute(ip, m, mp, fin, fdp);
1275
1276 if (mc != NULL)
1277 (void) ipfr_fastroute(ip, mc, &mc, fin, &fr->fr_dif);
1278 }
1279# endif /* !SOLARIS */
1280 return (pass & FR_PASS) ? 0 : error;
1281#else /* _KERNEL */
1282 if (pass & FR_NOMATCH)
1283 return 1;
1284 if (pass & FR_PASS)
1285 return 0;
1286 if (pass & FR_AUTH)
1287 return -2;
1288 if ((pass & FR_RETMASK) == FR_RETRST)
1289 return -3;
1290 if ((pass & FR_RETMASK) == FR_RETICMP)
1291 return -4;
1292 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1293 return -5;
1294 return -1;
1295#endif /* _KERNEL */
1296}
1297
1298
1299/*
1300 * ipf_cksum
1301 * addr should be 16bit aligned and len is in bytes.
1302 * length is in bytes
1303 */
1304u_short ipf_cksum(addr, len)
1305register u_short *addr;
1306register int len;
1307{
1308 register u_32_t sum = 0;
1309
1310 for (sum = 0; len > 1; len -= 2)
1311 sum += *addr++;
1312
1313 /* mop up an odd byte, if necessary */
1314 if (len == 1)
1315 sum += *(u_char *)addr;
1316
1317 /*
1318 * add back carry outs from top 16 bits to low 16 bits
1319 */
1320 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1321 sum += (sum >> 16); /* add carry */
1322 return (u_short)(~sum);
1323}
1324
1325
1326/*
1327 * NB: This function assumes we've pullup'd enough for all of the IP header
1328 * and the TCP header. We also assume that data blocks aren't allocated in
1329 * odd sizes.
1330 */
1331u_short fr_tcpsum(m, ip, tcp)
1332mb_t *m;
1333ip_t *ip;
1334tcphdr_t *tcp;
1335{
1336 u_short *sp, slen, ts;
1337 u_int sum, sum2;
1338 int hlen;
1339
1340 /*
1341 * Add up IP Header portion
1342 */
1343 hlen = ip->ip_hl << 2;
1344 slen = ip->ip_len - hlen;
1345 sum = htons((u_short)ip->ip_p);
1346 sum += htons(slen);
1347 sp = (u_short *)&ip->ip_src;
1348 sum += *sp++; /* ip_src */
1349 sum += *sp++;
1350 sum += *sp++; /* ip_dst */
1351 sum += *sp++;
1352 ts = tcp->th_sum;
1353 tcp->th_sum = 0;
1354#ifdef KERNEL
1355# if SOLARIS
1356 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
1357 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1358 sum2 = ~sum2 & 0xffff;
1359# else /* SOLARIS */
1360# if defined(BSD) || defined(sun)
1361# if BSD >= 199306
1362 m->m_data += hlen;
1363# else
1364 m->m_off += hlen;
1365# endif
1366 m->m_len -= hlen;
1367 sum2 = in_cksum(m, slen);
1368 m->m_len += hlen;
1369# if BSD >= 199306
1370 m->m_data -= hlen;
1371# else
1372 m->m_off -= hlen;
1373# endif
1374 /*
1375 * Both sum and sum2 are partial sums, so combine them together.
1376 */
1377 sum = (sum & 0xffff) + (sum >> 16);
1378 sum = ~sum & 0xffff;
1379 sum2 += sum;
1380 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1381# else /* defined(BSD) || defined(sun) */
1382{
1383 union {
1384 u_char c[2];
1385 u_short s;
1386 } bytes;
1387 u_short len = ip->ip_len;
1388# if defined(__sgi)
1389 int add;
1390# endif
1391
1392 /*
1393 * Add up IP Header portion
1394 */
1395 sp = (u_short *)&ip->ip_src;
1396 len -= (ip->ip_hl << 2);
1397 sum = ntohs(IPPROTO_TCP);
1398 sum += htons(len);
1399 sum += *sp++; /* ip_src */
1400 sum += *sp++;
1401 sum += *sp++; /* ip_dst */
1402 sum += *sp++;
1403 if (sp != (u_short *)tcp)
1404 sp = (u_short *)tcp;
1405 sum += *sp++; /* sport */
1406 sum += *sp++; /* dport */
1407 sum += *sp++; /* seq */
1408 sum += *sp++;
1409 sum += *sp++; /* ack */
1410 sum += *sp++;
1411 sum += *sp++; /* off */
1412 sum += *sp++; /* win */
1413 sum += *sp++; /* Skip over checksum */
1414 sum += *sp++; /* urp */
1415
1416# ifdef __sgi
1417 /*
1418 * In case we had to copy the IP & TCP header out of mbufs,
1419 * skip over the mbuf bits which are the header
1420 */
1421 if ((caddr_t)ip != mtod(m, caddr_t)) {
1422 hlen = (caddr_t)sp - (caddr_t)ip;
1423 while (hlen) {
1424 add = MIN(hlen, m->m_len);
1425 sp = (u_short *)(mtod(m, caddr_t) + add);
1426 hlen -= add;
1427 if (add == m->m_len) {
1428 m = m->m_next;
1429 if (!hlen) {
1430 if (!m)
1431 break;
1432 sp = mtod(m, u_short *);
1433 }
1434 PANIC((!m),("fr_tcpsum(1): not enough data"));
1435 }
1436 }
1437 }
1438# endif
1439
1440 if (!(len -= sizeof(*tcp)))
1441 goto nodata;
1442 while (len > 1) {
1443 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
1444 m = m->m_next;
1445 PANIC((!m),("fr_tcpsum(2): not enough data"));
1446 sp = mtod(m, u_short *);
1447 }
1448 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
1449 bytes.c[0] = *(u_char *)sp;
1450 m = m->m_next;
1451 PANIC((!m),("fr_tcpsum(3): not enough data"));
1452 sp = mtod(m, u_short *);
1453 bytes.c[1] = *(u_char *)sp;
1454 sum += bytes.s;
1455 sp = (u_short *)((u_char *)sp + 1);
1456 }
1457 if ((u_long)sp & 1) {
1458 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
1459 sum += bytes.s;
1460 } else
1461 sum += *sp++;
1462 len -= 2;
1463 }
1464 if (len)
1465 sum += ntohs(*(u_char *)sp << 8);
1466nodata:
1467 while (sum > 0xffff)
1468 sum = (sum & 0xffff) + (sum >> 16);
1469 sum2 = (u_short)(~sum & 0xffff);
1470}
1471# endif /* defined(BSD) || defined(sun) */
1472# endif /* SOLARIS */
1473#else /* KERNEL */
1474 sum2 = 0;
1475#endif /* KERNEL */
1476 tcp->th_sum = ts;
1477 return sum2;
1478}
1479
1480
1481#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
1482/*
1483 * Copyright (c) 1982, 1986, 1988, 1991, 1993
1484 * The Regents of the University of California. All rights reserved.
1485 *
1486 * Redistribution and use in source and binary forms, with or without
1487 * modification, are permitted provided that the following conditions
1488 * are met:
1489 * 1. Redistributions of source code must retain the above copyright
1490 * notice, this list of conditions and the following disclaimer.
1491 * 2. Redistributions in binary form must reproduce the above copyright
1492 * notice, this list of conditions and the following disclaimer in the
1493 * documentation and/or other materials provided with the distribution.
1494 * 3. All advertising materials mentioning features or use of this software
1495 * must display the following acknowledgement:
1496 * This product includes software developed by the University of
1497 * California, Berkeley and its contributors.
1498 * 4. Neither the name of the University nor the names of its contributors
1499 * may be used to endorse or promote products derived from this software
1500 * without specific prior written permission.
1501 *
1502 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1503 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1504 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1505 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1506 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1507 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1508 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1509 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1510 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1511 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1512 * SUCH DAMAGE.
1513 *
1514 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
1515 * $Id: fil.c,v 2.35.2.58 2002/03/13 02:23:13 darrenr Exp $
1516 */
1517/*
1518 * Copy data from an mbuf chain starting "off" bytes from the beginning,
1519 * continuing for "len" bytes, into the indicated buffer.
1520 */
1521void
1522m_copydata(m, off, len, cp)
1523 register mb_t *m;
1524 register int off;
1525 register int len;
1526 caddr_t cp;
1527{
1528 register unsigned count;
1529
1530 if (off < 0 || len < 0)
1531 panic("m_copydata");
1532 while (off > 0) {
1533 if (m == 0)
1534 panic("m_copydata");
1535 if (off < m->m_len)
1536 break;
1537 off -= m->m_len;
1538 m = m->m_next;
1539 }
1540 while (len > 0) {
1541 if (m == 0)
1542 panic("m_copydata");
1543 count = MIN(m->m_len - off, len);
1544 bcopy(mtod(m, caddr_t) + off, cp, count);
1545 len -= count;
1546 cp += count;
1547 off = 0;
1548 m = m->m_next;
1549 }
1550}
1551
1552
1553# ifndef linux
1554/*
1555 * Copy data from a buffer back into the indicated mbuf chain,
1556 * starting "off" bytes from the beginning, extending the mbuf
1557 * chain if necessary.
1558 */
1559void
1560m_copyback(m0, off, len, cp)
1561 struct mbuf *m0;
1562 register int off;
1563 register int len;
1564 caddr_t cp;
1565{
1566 register int mlen;
1567 register struct mbuf *m = m0, *n;
1568 int totlen = 0;
1569
1570 if (m0 == 0)
1571 return;
1572 while (off > (mlen = m->m_len)) {
1573 off -= mlen;
1574 totlen += mlen;
1575 if (m->m_next == 0) {
1576 n = m_getclr(M_DONTWAIT, m->m_type);
1577 if (n == 0)
1578 goto out;
1579 n->m_len = min(MLEN, len + off);
1580 m->m_next = n;
1581 }
1582 m = m->m_next;
1583 }
1584 while (len > 0) {
1585 mlen = min (m->m_len - off, len);
1586 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
1587 cp += mlen;
1588 len -= mlen;
1589 mlen += off;
1590 off = 0;
1591 totlen += mlen;
1592 if (len == 0)
1593 break;
1594 if (m->m_next == 0) {
1595 n = m_get(M_DONTWAIT, m->m_type);
1596 if (n == 0)
1597 break;
1598 n->m_len = min(MLEN, len);
1599 m->m_next = n;
1600 }
1601 m = m->m_next;
1602 }
1603out:
1604#if 0
1605 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
1606 m->m_pkthdr.len = totlen;
1607#endif
1608 return;
1609}
1610# endif /* linux */
1611#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
1612
1613
1614frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
1615u_32_t num, flags;
1616minor_t which;
1617int set;
1618frgroup_t ***fgpp;
1619{
1620 frgroup_t *fg, **fgp;
1621
1622 if (which == IPL_LOGAUTH)
1623 fgp = &ipfgroups[2][set];
1624 else if (flags & FR_ACCOUNT)
1625 fgp = &ipfgroups[1][set];
1626 else if (flags & (FR_OUTQUE|FR_INQUE))
1627 fgp = &ipfgroups[0][set];
1628 else
1629 return NULL;
1630 num &= 0xffff;
1631
1632 while ((fg = *fgp))
1633 if (fg->fg_num == num)
1634 break;
1635 else
1636 fgp = &fg->fg_next;
1637 if (fgpp)
1638 *fgpp = fgp;
1639 return fg;
1640}
1641
1642
1643frgroup_t *fr_addgroup(num, fp, which, set)
1644u_32_t num;
1645frentry_t *fp;
1646minor_t which;
1647int set;
1648{
1649 frgroup_t *fg, **fgp;
1650
1651 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
1652 return fg;
1653
1654 KMALLOC(fg, frgroup_t *);
1655 if (fg) {
1656 fg->fg_num = num;
1657 fg->fg_next = *fgp;
1658 fg->fg_head = fp;
1659 fg->fg_start = &fp->fr_grp;
1660 *fgp = fg;
1661 }
1662 return fg;
1663}
1664
1665
1666void fr_delgroup(num, flags, which, set)
1667u_32_t num, flags;
1668minor_t which;
1669int set;
1670{
1671 frgroup_t *fg, **fgp;
1672
1673 if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
1674 return;
1675
1676 *fgp = fg->fg_next;
1677 KFREE(fg);
1678}
1679
1680
1681
1682/*
1683 * recursively flush rules from the list, descending groups as they are
1684 * encountered. if a rule is the head of a group and it has lost all its
1685 * group members, then also delete the group reference.
1686 */
1687static int frflushlist(set, unit, nfreedp, listp)
1688int set;
1689minor_t unit;
1690int *nfreedp;
1691frentry_t **listp;
1692{
1693 register int freed = 0, i;
1694 register frentry_t *fp;
1695
1696 while ((fp = *listp)) {
1697 *listp = fp->fr_next;
1698 if (fp->fr_grp) {
1699 i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
1700 MUTEX_ENTER(&ipf_rw);
1701 fp->fr_ref -= i;
1702 MUTEX_EXIT(&ipf_rw);
1703 }
1704
1705 ATOMIC_DEC32(fp->fr_ref);
1706 if (fp->fr_grhead) {
1707 fr_delgroup(fp->fr_grhead, fp->fr_flags,
1708 unit, set);
1709 fp->fr_grhead = 0;
1710 }
1711 if (fp->fr_ref == 0) {
1712 KFREE(fp);
1713 freed++;
1714 } else
1715 fp->fr_next = NULL;
1716 }
1717 *nfreedp += freed;
1718 return freed;
1719}
1720
1721
1722int frflush(unit, flags)
1723minor_t unit;
1724int flags;
1725{
1726 int flushed = 0, set;
1727
1728 if (unit != IPL_LOGIPF)
1729 return 0;
1730 WRITE_ENTER(&ipf_mutex);
1731 bzero((char *)frcache, sizeof(frcache[0]) * 2);
1732
1733 set = fr_active;
1734 if (flags & FR_INACTIVE)
1735 set = 1 - set;
1736
1737 if (flags & FR_OUTQUE) {
1738#ifdef USE_INET6
1739 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]);
1740 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]);
1741#endif
1742 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
1743 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
1744 }
1745 if (flags & FR_INQUE) {
1746#ifdef USE_INET6
1747 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]);
1748 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]);
1749#endif
1750 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
1751 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
1752 }
1753 RWLOCK_EXIT(&ipf_mutex);
1754 return flushed;
1755}
1756
1757
1758char *memstr(src, dst, slen, dlen)
1759char *src, *dst;
1760int slen, dlen;
1761{
1762 char *s = NULL;
1763
1764 while (dlen >= slen) {
1765 if (bcmp(src, dst, slen) == 0) {
1766 s = dst;
1767 break;
1768 }
1769 dst++;
1770 dlen--;
1771 }
1772 return s;
1773}
1774
1775
1776void fixskip(listp, rp, addremove)
1777frentry_t **listp, *rp;
1778int addremove;
1779{
1780 frentry_t *fp;
1781 int rules = 0, rn = 0;
1782
1783 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
1784 ;
1785
1786 if (!fp)
1787 return;
1788
1789 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
1790 if (fp->fr_skip && (rn + fp->fr_skip >= rules))
1791 fp->fr_skip += addremove;
1792}
1793
1794
1795#ifdef _KERNEL
1796/*
1797 * count consecutive 1's in bit mask. If the mask generated by counting
1798 * consecutive 1's is different to that passed, return -1, else return #
1799 * of bits.
1800 */
1801int countbits(ip)
1802u_32_t ip;
1803{
1804 u_32_t ipn;
1805 int cnt = 0, i, j;
1806
1807 ip = ipn = ntohl(ip);
1808 for (i = 32; i; i--, ipn *= 2)
1809 if (ipn & 0x80000000)
1810 cnt++;
1811 else
1812 break;
1813 ipn = 0;
1814 for (i = 32, j = cnt; i; i--, j--) {
1815 ipn *= 2;
1816 if (j > 0)
1817 ipn++;
1818 }
1819 if (ipn == ip)
1820 return cnt;
1821 return -1;
1822}
1823
1824
1825/*
1826 * return the first IP Address associated with an interface
1827 */
1828int fr_ifpaddr(v, ifptr, inp)
1829int v;
1830void *ifptr;
1831struct in_addr *inp;
1832{
1833# ifdef USE_INET6
1834 struct in6_addr *inp6 = NULL;
1835# endif
1836# if SOLARIS
1837 ill_t *ill = ifptr;
1838# else
1839 struct ifnet *ifp = ifptr;
1840# endif
1841 struct in_addr in;
1842
1843# if SOLARIS
1844# ifdef USE_INET6
1845 if (v == 6) {
1846 struct in6_addr in6;
1847
1848 /*
1849 * First is always link local.
1850 */
1851 if (ill->ill_ipif->ipif_next)
1852 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
1853 else
1854 bzero((char *)&in6, sizeof(in6));
1855 bcopy((char *)&in6, (char *)inp, sizeof(in6));
1856 } else
1857# endif
1858 {
1859 in.s_addr = ill->ill_ipif->ipif_local_addr;
1860 *inp = in;
1861 }
1862# else /* SOLARIS */
1863# if linux
1864 ;
1865# else /* linux */
1866 struct sockaddr_in *sin;
1867 struct ifaddr *ifa;
1868
1869# if (__FreeBSD_version >= 300000)
1870 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1871# else
1872# if defined(__NetBSD__) || defined(__OpenBSD__)
1873 ifa = ifp->if_addrlist.tqh_first;
1874# else
1875# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
1876 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
1877# else
1878 ifa = ifp->if_addrlist;
1879# endif
1880# endif /* __NetBSD__ || __OpenBSD__ */
1881# endif /* __FreeBSD_version >= 300000 */
1882# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
1883 sin = (struct sockaddr_in *)&ifa->ifa_addr;
1884# else
1885 sin = (struct sockaddr_in *)ifa->ifa_addr;
1886 while (sin && ifa) {
1887 if ((v == 4) && (sin->sin_family == AF_INET))
1888 break;
1889# ifdef USE_INET6
1890 if ((v == 6) && (sin->sin_family == AF_INET6)) {
1891 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
1892 if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
1893 !IN6_IS_ADDR_LOOPBACK(inp6))
1894 break;
1895 }
1896# endif
1897# if (__FreeBSD_version >= 300000)
1898 ifa = TAILQ_NEXT(ifa, ifa_link);
1899# else
1900# if defined(__NetBSD__) || defined(__OpenBSD__)
1901 ifa = ifa->ifa_list.tqe_next;
1902# else
1903 ifa = ifa->ifa_next;
1904# endif
1905# endif /* __FreeBSD_version >= 300000 */
1906 if (ifa)
1907 sin = (struct sockaddr_in *)ifa->ifa_addr;
1908 }
1909 if (ifa == NULL)
1910 sin = NULL;
1911 if (sin == NULL)
1912 return -1;
1913# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
1914# ifdef USE_INET6
1915 if (v == 6)
1916 bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
1917 else
1918# endif
1919 {
1920 in = sin->sin_addr;
1921 *inp = in;
1922 }
1923# endif /* linux */
1924# endif /* SOLARIS */
1925 return 0;
1926}
1927
1928
1929static void frsynclist(fr)
1930register frentry_t *fr;
1931{
1932 for (; fr; fr = fr->fr_next) {
1933 if (fr->fr_ifa != NULL) {
1934 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v);
1935 if (fr->fr_ifa == NULL)
1936 fr->fr_ifa = (void *)-1;
1937 }
1938 if (fr->fr_grp)
1939 frsynclist(fr->fr_grp);
1940 }
1941}
1942
1943
1944void frsync()
1945{
1946# if !SOLARIS
1947 register struct ifnet *ifp;
1948
1949# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
1950 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
1951# if (NetBSD >= 199905) || defined(__OpenBSD__)
1952 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
1953# else
1954 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
1955# endif
1956# else
1957 for (ifp = ifnet; ifp; ifp = ifp->if_next)
1958# endif
1959 {
1960 ip_natsync(ifp);
1961 ip_statesync(ifp);
1962 }
1963 ip_natsync((struct ifnet *)-1);
1964# endif /* !SOLARIS */
1965
1966 WRITE_ENTER(&ipf_mutex);
1967 frsynclist(ipacct[0][fr_active]);
1968 frsynclist(ipacct[1][fr_active]);
1969 frsynclist(ipfilter[0][fr_active]);
1970 frsynclist(ipfilter[1][fr_active]);
1971#ifdef USE_INET6
1972 frsynclist(ipacct6[0][fr_active]);
1973 frsynclist(ipacct6[1][fr_active]);
1974 frsynclist(ipfilter6[0][fr_active]);
1975 frsynclist(ipfilter6[1][fr_active]);
1976#endif
1977 RWLOCK_EXIT(&ipf_mutex);
1978}
1979
1980
1981/*
1982 * In the functions below, bcopy() is called because the pointer being
1983 * copied _from_ in this instance is a pointer to a char buf (which could
1984 * end up being unaligned) and on the kernel's local stack.
1985 */
1986int ircopyptr(a, b, c)
1987void *a, *b;
1988size_t c;
1989{
1990 caddr_t ca;
1991 int err;
1992
1993#if SOLARIS
1994 if (copyin(a, (char *)&ca, sizeof(ca)))
1995 return EFAULT;
1996#else
1997 bcopy(a, &ca, sizeof(ca));
1998#endif
1999 err = copyin(ca, b, c);
2000 if (err)
2001 err = EFAULT;
2002 return err;
2003}
2004
2005
2006int iwcopyptr(a, b, c)
2007void *a, *b;
2008size_t c;
2009{
2010 caddr_t ca;
2011 int err;
2012
2013#if SOLARIS
2014 if (copyin(b, (char *)&ca, sizeof(ca)))
2015 return EFAULT;
2016#else
2017 bcopy(b, &ca, sizeof(ca));
2018#endif
2019 err = copyout(a, ca, c);
2020 if (err)
2021 err = EFAULT;
2022 return err;
2023}
2024
2025#else /* _KERNEL */
2026
2027
2028/*
2029 * return the first IP Address associated with an interface
2030 */
2031int fr_ifpaddr(v, ifptr, inp)
2032int v;
2033void *ifptr;
2034struct in_addr *inp;
2035{
2036 return 0;
2037}
2038
2039
2040int ircopyptr(a, b, c)
2041void *a, *b;
2042size_t c;
2043{
2044 caddr_t ca;
2045
2046 bcopy(a, &ca, sizeof(ca));
2047 bcopy(ca, b, c);
2048 return 0;
2049}
2050
2051
2052int iwcopyptr(a, b, c)
2053void *a, *b;
2054size_t c;
2055{
2056 caddr_t ca;
2057
2058 bcopy(b, &ca, sizeof(ca));
2059 bcopy(a, ca, c);
2060 return 0;
2061}
2062
2063
2064#endif
2065
2066
2067int fr_lock(data, lockp)
2068caddr_t data;
2069int *lockp;
2070{
2071 int arg, error;
2072
2073 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
2074 if (!error) {
2075 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
2076 if (!error)
2077 *lockp = arg;
2078 }
2079 return error;
2080}
2081
2082
2083void fr_getstat(fiop)
2084friostat_t *fiop;
2085{
2086 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
2087 fiop->f_locks[0] = fr_state_lock;
2088 fiop->f_locks[1] = fr_nat_lock;
2089 fiop->f_locks[2] = fr_frag_lock;
2090 fiop->f_locks[3] = fr_auth_lock;
2091 fiop->f_fin[0] = ipfilter[0][0];
2092 fiop->f_fin[1] = ipfilter[0][1];
2093 fiop->f_fout[0] = ipfilter[1][0];
2094 fiop->f_fout[1] = ipfilter[1][1];
2095 fiop->f_acctin[0] = ipacct[0][0];
2096 fiop->f_acctin[1] = ipacct[0][1];
2097 fiop->f_acctout[0] = ipacct[1][0];
2098 fiop->f_acctout[1] = ipacct[1][1];
2099#ifdef USE_INET6
2100 fiop->f_fin6[0] = ipfilter6[0][0];
2101 fiop->f_fin6[1] = ipfilter6[0][1];
2102 fiop->f_fout6[0] = ipfilter6[1][0];
2103 fiop->f_fout6[1] = ipfilter6[1][1];
2104 fiop->f_acctin6[0] = ipacct6[0][0];
2105 fiop->f_acctin6[1] = ipacct6[0][1];
2106 fiop->f_acctout6[0] = ipacct6[1][0];
2107 fiop->f_acctout6[1] = ipacct6[1][1];
2108#else
2109 fiop->f_fin6[0] = NULL;
2110 fiop->f_fin6[1] = NULL;
2111 fiop->f_fout6[0] = NULL;
2112 fiop->f_fout6[1] = NULL;
2113 fiop->f_acctin6[0] = NULL;
2114 fiop->f_acctin6[1] = NULL;
2115 fiop->f_acctout6[0] = NULL;
2116 fiop->f_acctout6[1] = NULL;
2117#endif
2118 fiop->f_active = fr_active;
2119 fiop->f_froute[0] = ipl_frouteok[0];
2120 fiop->f_froute[1] = ipl_frouteok[1];
2121
2122 fiop->f_running = fr_running;
2123 fiop->f_groups[0][0] = ipfgroups[0][0];
2124 fiop->f_groups[0][1] = ipfgroups[0][1];
2125 fiop->f_groups[1][0] = ipfgroups[1][0];
2126 fiop->f_groups[1][1] = ipfgroups[1][1];
2127 fiop->f_groups[2][0] = ipfgroups[2][0];
2128 fiop->f_groups[2][1] = ipfgroups[2][1];
2129#ifdef IPFILTER_LOG
2130 fiop->f_logging = 1;
2131#else
2132 fiop->f_logging = 0;
2133#endif
2134 fiop->f_defpass = fr_pass;
2135 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version));
2136}
2137
2138
2139#ifdef USE_INET6
2140int icmptoicmp6types[ICMP_MAXTYPE+1] = {
2141 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
2142 -1, /* 1: UNUSED */
2143 -1, /* 2: UNUSED */
2144 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
2145 -1, /* 4: ICMP_SOURCEQUENCH */
2146 ND_REDIRECT, /* 5: ICMP_REDIRECT */
2147 -1, /* 6: UNUSED */
2148 -1, /* 7: UNUSED */
2149 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
2150 -1, /* 9: UNUSED */
2151 -1, /* 10: UNUSED */
2152 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
2153 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
2154 -1, /* 13: ICMP_TSTAMP */
2155 -1, /* 14: ICMP_TSTAMPREPLY */
2156 -1, /* 15: ICMP_IREQ */
2157 -1, /* 16: ICMP_IREQREPLY */
2158 -1, /* 17: ICMP_MASKREQ */
2159 -1, /* 18: ICMP_MASKREPLY */
2160};
2161
2162
2163int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
2164 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
2165 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
2166 -1, /* 2: ICMP_UNREACH_PROTOCOL */
2167 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
2168 -1, /* 4: ICMP_UNREACH_NEEDFRAG */
2169 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
2170 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
2171 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
2172 -1, /* 8: ICMP_UNREACH_ISOLATED */
2173 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
2174 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
2175 -1, /* 11: ICMP_UNREACH_TOSNET */
2176 -1, /* 12: ICMP_UNREACH_TOSHOST */
2177 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
2178};
2179#endif