1/*
2 * Copyright (C) 1993-2000 by Darren Reed.
3 *
4 * Redistribution and use in source and binary forms are permitted
5 * provided that this notice is preserved and due credit is given
6 * to the original author and the contributors.
7 */
8#if !defined(lint)
9static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
10/* static const char rcsid[] = "@(#)$Id: fil.c,v 2.3.2.16 2000/01/27 08:49:37 darrenr Exp $"; */
11static const char rcsid[] = "@(#)$FreeBSD: head/sys/contrib/ipfilter/netinet/fil.c 72006 2001-02-04 14:26:56Z darrenr $";
12#endif
13
14#include <sys/errno.h>
15#include <sys/types.h>
16#include <sys/param.h>
17#include <sys/time.h>
18#include <sys/file.h>
19#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
20 defined(_KERNEL)
21# include "opt_ipfilter_log.h"
22#endif
23#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
24 (__FreeBSD_version >= 220000)
25# if (__FreeBSD_version >= 400000)
26# ifndef KLD_MODULE
27# include "opt_inet6.h"
28# endif
29# if (__FreeBSD_version == 400019)
30# define CSUM_DELAY_DATA
31# endif
32# endif
33# include <sys/filio.h>
34# include <sys/fcntl.h>
35#else
36# include <sys/ioctl.h>
37#endif
38#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
39# include <sys/systm.h>
40#else
41# include <stdio.h>
42# include <string.h>
43# include <stdlib.h>
44#endif
45#include <sys/uio.h>
46#if !defined(__SVR4) && !defined(__svr4__)
47# ifndef linux
48# include <sys/mbuf.h>
49# endif
50#else
51# include <sys/byteorder.h>
52# if SOLARIS2 < 5
53# include <sys/dditypes.h>
54# endif
55# include <sys/stream.h>
56#endif
57#ifndef linux
58# include <sys/protosw.h>
59# include <sys/socket.h>
60#endif
61#include <net/if.h>
62#ifdef sun
63# include <net/af.h>
64#endif
65#include <net/route.h>
66#include <netinet/in.h>
67#include <netinet/in_systm.h>
68#include <netinet/ip.h>
69#ifndef linux
70# include <netinet/ip_var.h>
71#endif
72#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
73# include <sys/hashing.h>
74# include <netinet/in_var.h>
75#endif
76#include <netinet/tcp.h>
77#include <netinet/udp.h>
78#include <netinet/ip_icmp.h>
79#include "netinet/ip_compat.h"
80#ifdef USE_INET6
81# include <netinet/icmp6.h>
82# if !SOLARIS && defined(_KERNEL)
83# include <netinet6/in6_var.h>
84# endif
85#endif
86#include <netinet/tcpip.h>
87#include "netinet/ip_fil.h"
88#include "netinet/ip_proxy.h"
89#include "netinet/ip_nat.h"
90#include "netinet/ip_frag.h"
91#include "netinet/ip_state.h"
92#include "netinet/ip_auth.h"
93# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
94# include <sys/malloc.h>
95# if defined(_KERNEL) && !defined(IPFILTER_LKM)
96# include "opt_ipfilter.h"
97# endif
98# endif
99#ifndef MIN
100# define MIN(a,b) (((a)<(b))?(a):(b))
101#endif
102#include "netinet/ipl.h"
103
104#include <machine/in_cksum.h>
105
106#ifndef _KERNEL
107# include "ipf.h"
108# include "ipt.h"
109extern int opts;
110
111# define FR_VERBOSE(verb_pr) verbose verb_pr
112# define FR_DEBUG(verb_pr) debug verb_pr
113# define IPLLOG(a, c, d, e) ipllog()
114#else /* #ifndef _KERNEL */
115# define FR_VERBOSE(verb_pr)
116# define FR_DEBUG(verb_pr)
117# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
118# if SOLARIS || defined(__sgi)
119extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat;
120extern kmutex_t ipf_rw;
121# endif
122# if SOLARIS
123# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, \
124 ip, qif)
125# else /* SOLARIS */
126# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, ip)
127# endif /* SOLARIS || __sgi */
128#endif /* _KERNEL */
129
130
131struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
132struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
133#ifdef USE_INET6
134 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
135 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
136#endif
137 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
138struct frgroup *ipfgroups[3][2];
139int fr_flags = IPF_LOGGING;
140int fr_active = 0;
141int fr_chksrc = 0;
142int fr_minttl = 3;
143int fr_minttllog = 1;
144#if defined(IPFILTER_DEFAULT_BLOCK)
145int fr_pass = FR_NOMATCH|FR_BLOCK;
146#else
147int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
148#endif
149char ipfilter_version[] = IPL_VERSION;
150
151fr_info_t frcache[2];
152
153static int frflushlist __P((int, minor_t, int *, frentry_t **));
154#ifdef _KERNEL
155static void frsynclist __P((frentry_t *));
156#endif
157
158
159/*
160 * bit values for identifying presence of individual IP options
161 */
162struct optlist ipopts[20] = {
163 { IPOPT_NOP, 0x000001 },
164 { IPOPT_RR, 0x000002 },
165 { IPOPT_ZSU, 0x000004 },
166 { IPOPT_MTUP, 0x000008 },
167 { IPOPT_MTUR, 0x000010 },
168 { IPOPT_ENCODE, 0x000020 },
169 { IPOPT_TS, 0x000040 },
170 { IPOPT_TR, 0x000080 },
171 { IPOPT_SECURITY, 0x000100 },
172 { IPOPT_LSRR, 0x000200 },
173 { IPOPT_E_SEC, 0x000400 },
174 { IPOPT_CIPSO, 0x000800 },
175 { IPOPT_SATID, 0x001000 },
176 { IPOPT_SSRR, 0x002000 },
177 { IPOPT_ADDEXT, 0x004000 },
178 { IPOPT_VISA, 0x008000 },
179 { IPOPT_IMITD, 0x010000 },
180 { IPOPT_EIP, 0x020000 },
181 { IPOPT_FINN, 0x040000 },
182 { 0, 0x000000 }
183};
184
185/*
186 * bit values for identifying presence of individual IP security options
187 */
188struct optlist secopt[8] = {
189 { IPSO_CLASS_RES4, 0x01 },
190 { IPSO_CLASS_TOPS, 0x02 },
191 { IPSO_CLASS_SECR, 0x04 },
192 { IPSO_CLASS_RES3, 0x08 },
193 { IPSO_CLASS_CONF, 0x10 },
194 { IPSO_CLASS_UNCL, 0x20 },
195 { IPSO_CLASS_RES2, 0x40 },
196 { IPSO_CLASS_RES1, 0x80 }
197};
198
199
200/*
201 * compact the IP header into a structure which contains just the info.
202 * which is useful for comparing IP headers with.
203 */
204void fr_makefrip(hlen, ip, fin)
205int hlen;
206ip_t *ip;
207fr_info_t *fin;
208{
209 u_short optmsk = 0, secmsk = 0, auth = 0;
210 int i, mv, ol, off, p, plen, v;
211 fr_ip_t *fi = &fin->fin_fi;
212 struct optlist *op;
213 u_char *s, opt;
214 tcphdr_t *tcp;
215
216 fin->fin_rev = 0;
217 fin->fin_fr = NULL;
218 fin->fin_tcpf = 0;
219 fin->fin_data[0] = 0;
220 fin->fin_data[1] = 0;
221 fin->fin_rule = -1;
222 fin->fin_group = -1;
223#ifdef _KERNEL
224 fin->fin_icode = ipl_unreach;
225#endif
226 v = fin->fin_v;
227 fi->fi_v = v;
228 fin->fin_hlen = hlen;
229 if (v == 4) {
230 fin->fin_id = ip->ip_id;
231 fi->fi_tos = ip->ip_tos;
232 off = (ip->ip_off & IP_OFFMASK) << 3;
233 tcp = (tcphdr_t *)((char *)ip + hlen);
234 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
235 fi->fi_src.i6[1] = 0;
236 fi->fi_src.i6[2] = 0;
237 fi->fi_src.i6[3] = 0;
238 fi->fi_dst.i6[1] = 0;
239 fi->fi_dst.i6[2] = 0;
240 fi->fi_dst.i6[3] = 0;
241 fi->fi_saddr = ip->ip_src.s_addr;
242 fi->fi_daddr = ip->ip_dst.s_addr;
243 p = ip->ip_p;
244 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
245 if (ip->ip_off & 0x3fff)
246 fi->fi_fl |= FI_FRAG;
247 plen = ip->ip_len;
248 fin->fin_dlen = plen - hlen;
249 }
250#ifdef USE_INET6
251 else if (v == 6) {
252 ip6_t *ip6 = (ip6_t *)ip;
253
254 off = 0;
255 p = ip6->ip6_nxt;
256 fi->fi_p = p;
257 fi->fi_ttl = ip6->ip6_hlim;
258 tcp = (tcphdr_t *)(ip6 + 1);
259 fi->fi_src.in6 = ip6->ip6_src;
260 fi->fi_dst.in6 = ip6->ip6_dst;
261 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
262 fi->fi_tos = 0;
263 fi->fi_fl = 0;
264 plen = ntohs(ip6->ip6_plen);
265 fin->fin_dlen = plen;
266 }
267#endif
268 else
269 return;
270
271 fin->fin_off = off;
272 fin->fin_plen = plen;
273 fin->fin_dp = (void *)tcp;
274
275 switch (p)
276 {
277#ifdef USE_INET6
278 case IPPROTO_ICMPV6 :
279 {
280 int minicmpsz = sizeof(struct icmp6_hdr);
281 struct icmp6_hdr *icmp6;
282
283 if (fin->fin_dlen > 1) {
284 fin->fin_data[0] = *(u_short *)tcp;
285
286 icmp6 = (struct icmp6_hdr *)tcp;
287
288 switch (icmp6->icmp6_type)
289 {
290 case ICMP6_ECHO_REPLY :
291 case ICMP6_ECHO_REQUEST :
292 minicmpsz = ICMP6ERR_MINPKTLEN;
293 break;
294 case ICMP6_DST_UNREACH :
295 case ICMP6_PACKET_TOO_BIG :
296 case ICMP6_TIME_EXCEEDED :
297 case ICMP6_PARAM_PROB :
298 minicmpsz = ICMP6ERR_IPICMPHLEN;
299 break;
300 default :
301 break;
302 }
303 }
304
305 if (!(plen >= hlen + minicmpsz))
306 fi->fi_fl |= FI_SHORT;
307
308 break;
309 }
310#endif
311 case IPPROTO_ICMP :
312 {
313 int minicmpsz = sizeof(struct icmp);
314 icmphdr_t *icmp;
315
316 if (!off && (fin->fin_dlen > 1)) {
317 fin->fin_data[0] = *(u_short *)tcp;
318
319 icmp = (icmphdr_t *)tcp;
320
321 if (icmp->icmp_type == ICMP_ECHOREPLY ||
322 icmp->icmp_type == ICMP_ECHO)
323 minicmpsz = ICMP_MINLEN;
324
325 /*
326 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
327 * 3*timestamp(3*4)
328 */
329 else if (icmp->icmp_type == ICMP_TSTAMP ||
330 icmp->icmp_type == ICMP_TSTAMPREPLY)
331 minicmpsz = 20;
332
333 /*
334 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
335 * mask(4)
336 */
337 else if (icmp->icmp_type == ICMP_MASKREQ ||
338 icmp->icmp_type == ICMP_MASKREPLY)
339 minicmpsz = 12;
340 }
341
342 if ((!(plen >= hlen + minicmpsz) && !off) ||
343 (off && off < sizeof(struct icmp)))
344 fi->fi_fl |= FI_SHORT;
345
346 break;
347 }
348 case IPPROTO_TCP :
349 fi->fi_fl |= FI_TCPUDP;
350#ifdef USE_INET6
351 if (v == 6) {
352 if (plen < sizeof(struct tcphdr))
353 fi->fi_fl |= FI_SHORT;
354 } else
355#endif
356 if (v == 4) {
357 if ((!IPMINLEN(ip, tcphdr) && !off) ||
358 (off && off < sizeof(struct tcphdr)))
359 fi->fi_fl |= FI_SHORT;
360 }
361 if (!(fi->fi_fl & FI_SHORT) && !off)
362 fin->fin_tcpf = tcp->th_flags;
363 goto getports;
364 case IPPROTO_UDP :
365 fi->fi_fl |= FI_TCPUDP;
366#ifdef USE_INET6
367 if (v == 6) {
368 if (plen < sizeof(struct udphdr))
369 fi->fi_fl |= FI_SHORT;
370 } else
371#endif
372 if (v == 4) {
373 if ((!IPMINLEN(ip, udphdr) && !off) ||
374 (off && off < sizeof(struct udphdr)))
375 fi->fi_fl |= FI_SHORT;
376 }
377getports:
378 if (!off && (fin->fin_dlen > 3)) {
379 fin->fin_data[0] = ntohs(tcp->th_sport);
380 fin->fin_data[1] = ntohs(tcp->th_dport);
381 }
382 break;
383 default :
384 break;
385 }
386
387#ifdef USE_INET6
388 if (v == 6) {
389 fi->fi_optmsk = 0;
390 fi->fi_secmsk = 0;
391 fi->fi_auth = 0;
392 return;
393 }
394#endif
395
396 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
397 opt = *s;
398 if (opt == '\0')
399 break;
400 else if (opt == IPOPT_NOP)
401 ol = 1;
402 else {
403 if (hlen < 2)
404 break;
405 ol = (int)*(s + 1);
406 if (ol < 2 || ol > hlen)
407 break;
408 }
409 for (i = 9, mv = 4; mv >= 0; ) {
410 op = ipopts + i;
411 if (opt == (u_char)op->ol_val) {
412 optmsk |= op->ol_bit;
413 if (opt == IPOPT_SECURITY) {
414 struct optlist *sp;
415 u_char sec;
416 int j, m;
417
418 sec = *(s + 2); /* classification */
419 for (j = 3, m = 2; m >= 0; ) {
420 sp = secopt + j;
421 if (sec == sp->ol_val) {
422 secmsk |= sp->ol_bit;
423 auth = *(s + 3);
424 auth *= 256;
425 auth += *(s + 4);
426 break;
427 }
428 if (sec < sp->ol_val)
429 j -= m--;
430 else
431 j += m--;
432 }
433 }
434 break;
435 }
436 if (opt < op->ol_val)
437 i -= mv--;
438 else
439 i += mv--;
440 }
441 hlen -= ol;
442 s += ol;
443 }
444 if (auth && !(auth & 0x0100))
445 auth &= 0xff00;
446 fi->fi_optmsk = optmsk;
447 fi->fi_secmsk = secmsk;
448 fi->fi_auth = auth;
449}
450
451
452/*
453 * check an IP packet for TCP/UDP characteristics such as ports and flags.
454 */
455int fr_tcpudpchk(ft, fin)
456frtuc_t *ft;
457fr_info_t *fin;
458{
459 register u_short po, tup;
460 register char i;
461 register int err = 1;
462
463 /*
464 * Both ports should *always* be in the first fragment.
465 * So far, I cannot find any cases where they can not be.
466 *
467 * compare destination ports
468 */
469 if ((i = (int)ft->ftu_dcmp)) {
470 po = ft->ftu_dport;
471 tup = fin->fin_data[1];
472 /*
473 * Do opposite test to that required and
474 * continue if that succeeds.
475 */
476 if (!--i && tup != po) /* EQUAL */
477 err = 0;
478 else if (!--i && tup == po) /* NOTEQUAL */
479 err = 0;
480 else if (!--i && tup >= po) /* LESSTHAN */
481 err = 0;
482 else if (!--i && tup <= po) /* GREATERTHAN */
483 err = 0;
484 else if (!--i && tup > po) /* LT or EQ */
485 err = 0;
486 else if (!--i && tup < po) /* GT or EQ */
487 err = 0;
488 else if (!--i && /* Out of range */
489 (tup >= po && tup <= ft->ftu_dtop))
490 err = 0;
491 else if (!--i && /* In range */
492 (tup <= po || tup >= ft->ftu_dtop))
493 err = 0;
494 }
495 /*
496 * compare source ports
497 */
498 if (err && (i = (int)ft->ftu_scmp)) {
499 po = ft->ftu_sport;
500 tup = fin->fin_data[0];
501 if (!--i && tup != po)
502 err = 0;
503 else if (!--i && tup == po)
504 err = 0;
505 else if (!--i && tup >= po)
506 err = 0;
507 else if (!--i && tup <= po)
508 err = 0;
509 else if (!--i && tup > po)
510 err = 0;
511 else if (!--i && tup < po)
512 err = 0;
513 else if (!--i && /* Out of range */
514 (tup >= po && tup <= ft->ftu_stop))
515 err = 0;
516 else if (!--i && /* In range */
517 (tup <= po || tup >= ft->ftu_stop))
518 err = 0;
519 }
520
521 /*
522 * If we don't have all the TCP/UDP header, then how can we
523 * expect to do any sort of match on it ? If we were looking for
524 * TCP flags, then NO match. If not, then match (which should
525 * satisfy the "short" class too).
526 */
527 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
528 if (fin->fin_fi.fi_fl & FI_SHORT)
529 return !(ft->ftu_tcpf | ft->ftu_tcpfm);
530 /*
531 * Match the flags ? If not, abort this match.
532 */
533 if (ft->ftu_tcpfm &&
534 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) {
535 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
536 ft->ftu_tcpfm, ft->ftu_tcpf));
537 err = 0;
538 }
539 }
540 return err;
541}
542
543/*
544 * Check the input/output list of rules for a match and result.
545 * Could be per interface, but this gets real nasty when you don't have
546 * kernel sauce.
547 */
548int fr_scanlist(pass, ip, fin, m)
549u_32_t pass;
550ip_t *ip;
551register fr_info_t *fin;
552void *m;
553{
554 register struct frentry *fr;
555 register fr_ip_t *fi = &fin->fin_fi;
556 int rulen, portcmp = 0, off, skip = 0, logged = 0;
557 u_32_t passt;
558
559 fr = fin->fin_fr;
560 fin->fin_fr = NULL;
561 fin->fin_rule = 0;
562 fin->fin_group = 0;
563 if (fin->fin_v == 4)
564 off = ip->ip_off & IP_OFFMASK;
565 else
566 off = 0;
567 pass |= (fi->fi_fl << 24);
568
569 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
570 portcmp = 1;
571
572 for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
573 if (skip) {
574 skip--;
575 continue;
576 }
577 /*
578 * In all checks below, a null (zero) value in the
579 * filter struture is taken to mean a wildcard.
580 *
581 * check that we are working for the right interface
582 */
583#ifdef _KERNEL
584# if BSD >= 199306
585 if (fin->fin_out != 0) {
586 if ((fr->fr_oifa &&
587 fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif) ||
588 (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp))
589 continue;
590 } else
591# endif
592 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
593 continue;
594#else
595 if (opts & (OPT_VERBOSE|OPT_DEBUG))
596 printf("\n");
597 FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' :
598 (pass & FR_AUTH) ? 'a' : 'b'));
599 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
600 continue;
601 FR_VERBOSE((":i"));
602#endif
603 {
604 register u_32_t *ld, *lm, *lip;
605 register int i;
606
607 lip = (u_32_t *)fi;
608 lm = (u_32_t *)&fr->fr_mip;
609 ld = (u_32_t *)&fr->fr_ip;
610 i = ((*lip & *lm) != *ld);
611 FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
612 *lip, *lm, *ld));
613 if (i)
614 continue;
615 /*
616 * We now know whether the packet version and the
617 * rule version match, along with protocol, ttl and
618 * tos.
619 */
620 lip++, lm++, ld++;
621 /*
622 * Unrolled loops (4 each, for 32 bits).
623 */
624 i |= ((*lip & *lm) != *ld) << 19;
625 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
626 *lip, *lm, *ld));
627 if (fi->fi_v == 6) {
628 lip++, lm++, ld++;
629 i |= ((*lip & *lm) != *ld) << 19;
630 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
631 *lip, *lm, *ld));
632 lip++, lm++, ld++;
633 i |= ((*lip & *lm) != *ld) << 19;
634 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
635 *lip, *lm, *ld));
636 lip++, lm++, ld++;
637 i |= ((*lip & *lm) != *ld) << 19;
638 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
639 *lip, *lm, *ld));
640 } else {
641 lip += 3;
642 lm += 3;
643 ld += 3;
644 }
645 i ^= (fr->fr_flags & FR_NOTSRCIP);
646 if (i)
647 continue;
648 lip++, lm++, ld++;
649 i |= ((*lip & *lm) != *ld) << 20;
650 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
651 *lip, *lm, *ld));
652 if (fi->fi_v == 6) {
653 lip++, lm++, ld++;
654 i |= ((*lip & *lm) != *ld) << 20;
655 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
656 *lip, *lm, *ld));
657 lip++, lm++, ld++;
658 i |= ((*lip & *lm) != *ld) << 20;
659 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
660 *lip, *lm, *ld));
661 lip++, lm++, ld++;
662 i |= ((*lip & *lm) != *ld) << 20;
663 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
664 *lip, *lm, *ld));
665 } else {
666 lip += 3;
667 lm += 3;
668 ld += 3;
669 }
670 i ^= (fr->fr_flags & FR_NOTDSTIP);
671 if (i)
672 continue;
673 lip++, lm++, ld++;
674 i |= ((*lip & *lm) != *ld);
675 FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
676 *lip, *lm, *ld));
677 lip++, lm++, ld++;
678 i |= ((*lip & *lm) != *ld);
679 FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
680 *lip, *lm, *ld));
681 if (i)
682 continue;
683 }
684
685 /*
686 * If a fragment, then only the first has what we're looking
687 * for here...
688 */
689 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
690 fr->fr_tcpfm))
691 continue;
692 if (fi->fi_fl & FI_TCPUDP) {
693 if (!fr_tcpudpchk(&fr->fr_tuc, fin))
694 continue;
695 } else if (fr->fr_icmpm || fr->fr_icmp) {
696 if ((fi->fi_p != IPPROTO_ICMP) || off ||
697 (fin->fin_dlen < 2))
698 continue;
699 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
700 FR_DEBUG(("i. %#x & %#x != %#x\n",
701 fin->fin_data[0], fr->fr_icmpm,
702 fr->fr_icmp));
703 continue;
704 }
705 }
706 FR_VERBOSE(("*"));
707 /*
708 * Just log this packet...
709 */
710 passt = fr->fr_flags;
711#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
712 if (securelevel <= 0)
713#endif
714 if ((passt & FR_CALLNOW) && fr->fr_func)
715 passt = (*fr->fr_func)(passt, ip, fin);
716 fin->fin_fr = fr;
717#ifdef IPFILTER_LOG
718 if ((passt & FR_LOGMASK) == FR_LOG) {
719 if (!IPLLOG(passt, ip, fin, m)) {
720 if (passt & FR_LOGORBLOCK)
721 passt |= FR_BLOCK|FR_QUICK;
722 ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
723 }
724 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
725 logged = 1;
726 }
727#endif /* IPFILTER_LOG */
728 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
729 pass = passt;
730 FR_DEBUG(("pass %#x\n", pass));
731 ATOMIC_INCL(fr->fr_hits);
732 if (pass & FR_ACCOUNT)
733 fr->fr_bytes += (U_QUAD_T)ip->ip_len;
734 else
735 fin->fin_icode = fr->fr_icode;
736 fin->fin_rule = rulen;
737 fin->fin_group = fr->fr_group;
738 if (fr->fr_grp) {
739 fin->fin_fr = fr->fr_grp;
740 pass = fr_scanlist(pass, ip, fin, m);
741 if (fin->fin_fr == NULL) {
742 fin->fin_rule = rulen;
743 fin->fin_group = fr->fr_group;
744 fin->fin_fr = fr;
745 }
746 if (pass & FR_DONTCACHE)
747 logged = 1;
748 }
749 if (pass & FR_QUICK)
750 break;
751 }
752 if (logged)
753 pass |= FR_DONTCACHE;
754 return pass;
755}
756
757
758/*
759 * frcheck - filter check
760 * check using source and destination addresses/ports in a packet whether
761 * or not to pass it on or not.
762 */
763int fr_check(ip, hlen, ifp, out
764#if defined(_KERNEL) && SOLARIS
765, qif, mp)
766qif_t *qif;
767#else
768, mp)
769#endif
770mb_t **mp;
771ip_t *ip;
772int hlen;
773void *ifp;
774int out;
775{
776 /*
777 * The above really sucks, but short of writing a diff
778 */
779 fr_info_t frinfo, *fc;
780 register fr_info_t *fin = &frinfo;
781 int changed, error = EHOSTUNREACH, v = ip->ip_v;
782 frentry_t *fr = NULL, *list;
783 u_32_t pass, apass;
784#if !SOLARIS || !defined(_KERNEL)
785 register mb_t *m = *mp;
786#endif
787
788#ifdef _KERNEL
789 int p, len, drop = 0, logit = 0;
790 mb_t *mc = NULL;
791# if !defined(__SVR4) && !defined(__svr4__)
792# ifdef __sgi
793 char hbuf[(0xf << 2) + sizeof(struct icmp) + sizeof(ip_t) + 8];
794# endif
795 int up;
796
797# ifdef M_CANFASTFWD
798 /*
799 * XXX For now, IP Filter and fast-forwarding of cached flows
800 * XXX are mutually exclusive. Eventually, IP Filter should
801 * XXX get a "can-fast-forward" filter rule.
802 */
803 m->m_flags &= ~M_CANFASTFWD;
804# endif /* M_CANFASTFWD */
805# ifdef CSUM_DELAY_DATA
806 /*
807 * disable delayed checksums.
808 */
809 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
810 in_delayed_cksum(m);
811 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
812 }
813# endif /* CSUM_DELAY_DATA */
814
815# ifdef USE_INET6
816 if (v == 6) {
817 len = ntohs(((ip6_t*)ip)->ip6_plen);
818 p = ((ip6_t *)ip)->ip6_nxt;
819 } else
820# endif
821 {
822 p = ip->ip_p;
823 len = ip->ip_len;
824 }
825
826 if ((p == IPPROTO_TCP || p == IPPROTO_UDP || p == IPPROTO_ICMP
827# ifdef USE_INET6
828 || (v == 6 && p == IPPROTO_ICMPV6)
829# endif
830 )) {
831 int plen = 0;
832
833 if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
834 switch(p)
835 {
836 case IPPROTO_TCP:
837 plen = sizeof(tcphdr_t);
838 break;
839 case IPPROTO_UDP:
840 plen = sizeof(udphdr_t);
841 break;
842 /* 96 - enough for complete ICMP error IP header */
843 case IPPROTO_ICMP:
844 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
845 break;
846# ifdef USE_INET6
847 case IPPROTO_ICMPV6 :
848 /*
849 * XXX does not take intermediate header
850 * into account
851 */
852 plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
853 break;
854# endif
855 }
856 up = MIN(hlen + plen, len);
857
858 if (up > m->m_len) {
859# ifdef __sgi
860 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
861 if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
862 ATOMIC_INCL(frstats[out].fr_pull[1]);
863 return -1;
864 }
865 m_copydata(m, 0, up, hbuf);
866 ATOMIC_INCL(frstats[out].fr_pull[0]);
867 ip = (ip_t *)hbuf;
868# else /* __ sgi */
869# ifndef linux
870 if ((*mp = m_pullup(m, up)) == 0) {
871 ATOMIC_INCL(frstats[out].fr_pull[1]);
872 return -1;
873 } else {
874 ATOMIC_INCL(frstats[out].fr_pull[0]);
875 m = *mp;
876 ip = mtod(m, ip_t *);
877 }
878# endif /* !linux */
879# endif /* __sgi */
880 } else
881 up = 0;
882 } else
883 up = 0;
884# endif /* !defined(__SVR4) && !defined(__svr4__) */
885# if SOLARIS
886 mb_t *m = qif->qf_m;
887
888 if ((u_int)ip & 0x3)
889 return 2;
890 fin->fin_qfm = m;
891 fin->fin_qif = qif;
892# endif
893#endif /* _KERNEL */
894
895#ifndef __FreeBSD__
896 /*
897 * Be careful here: ip_id is in network byte order when called
898 * from ip_output()
899 */
900 if ((out) && (v == 4))
901 ip->ip_id = ntohs(ip->ip_id);
902#endif
903
904 changed = 0;
905 fin->fin_ifp = ifp;
906 fin->fin_v = v;
907 fin->fin_out = out;
908 fin->fin_mp = mp;
909 fr_makefrip(hlen, ip, fin);
910
911#ifdef _KERNEL
912# ifdef USE_INET6
913 if (v == 6) {
914 ATOMIC_INCL(frstats[0].fr_ipv6[out]);
915 if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
916 ATOMIC_INCL(frstats[0].fr_badttl);
917 if (fr_minttllog)
918 logit = -2;
919 }
920 } else
921# endif
922 if (!out) {
923 if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
924 ATOMIC_INCL(frstats[0].fr_badsrc);
925 if (fr_chksrc == 2)
926 logit = -2;
927 } else if (ip->ip_ttl < fr_minttl) {
928 ATOMIC_INCL(frstats[0].fr_badttl);
929 if (fr_minttllog)
930 logit = -3;
931 }
932 }
933 if (drop) {
934# ifdef IPFILTER_LOG
935 if (logit) {
936 fin->fin_group = logit;
937 pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
938 (void) IPLLOG(pass, ip, fin, m);
939 }
940# endif
941# if !SOLARIS
942 m_freem(m);
943# endif
944 return error;
945 }
946#endif
947 pass = fr_pass;
948 if (fin->fin_fi.fi_fl & FI_SHORT) {
949 ATOMIC_INCL(frstats[out].fr_short);
950 }
951
952 READ_ENTER(&ipf_mutex);
953
954 if (fin->fin_fi.fi_fl & FI_SHORT)
955 ATOMIC_INCL(frstats[out].fr_short);
956
957 /*
958 * Check auth now. This, combined with the check below to see if apass
959 * is 0 is to ensure that we don't count the packet twice, which can
960 * otherwise occur when we reprocess it. As it is, we only count it
961 * after it has no auth. table matchup. This also stops NAT from
962 * occuring until after the packet has been auth'd.
963 */
964 apass = fr_checkauth(ip, fin);
965
966 if (!out) {
967#ifdef USE_INET6
968 if (v == 6)
969 list = ipacct6[0][fr_active];
970 else
971#endif
972 list = ipacct[0][fr_active];
973 changed = ip_natin(ip, fin);
974 if (!apass && (fin->fin_fr = list) &&
975 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
976 ATOMIC_INCL(frstats[0].fr_acct);
977 }
978 }
979
980 if (apass || (!(fr = ipfr_knownfrag(ip, fin)) &&
981 !(fr = fr_checkstate(ip, fin)))) {
982 /*
983 * If a packet is found in the auth table, then skip checking
984 * the access lists for permission but we do need to consider
985 * the result as if it were from the ACL's.
986 */
987 if (!apass) {
988 fc = frcache + out;
989 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
990 /*
991 * copy cached data so we can unlock the mutex
992 * earlier.
993 */
994 bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
995 ATOMIC_INCL(frstats[out].fr_chit);
996 if ((fr = fin->fin_fr)) {
997 ATOMIC_INCL(fr->fr_hits);
998 pass = fr->fr_flags;
999 }
1000 } else {
1001#ifdef USE_INET6
1002 if (v == 6)
1003 list = ipfilter6[out][fr_active];
1004 else
1005#endif
1006 list = ipfilter[out][fr_active];
1007 if ((fin->fin_fr = list))
1008 pass = fr_scanlist(fr_pass, ip, fin, m);
1009 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
1010 bcopy((char *)fin, (char *)fc,
1011 FI_COPYSIZE);
1012 if (pass & FR_NOMATCH) {
1013 ATOMIC_INCL(frstats[out].fr_nom);
1014 }
1015 }
1016 fr = fin->fin_fr;
1017 } else
1018 pass = apass;
1019
1020 /*
1021 * If we fail to add a packet to the authorization queue,
1022 * then we drop the packet later. However, if it was added
1023 * then pretend we've dropped it already.
1024 */
1025 if ((pass & FR_AUTH))
1026 if (fr_newauth((mb_t *)m, fin, ip) != 0)
1027#ifdef _KERNEL
1028 m = *mp = NULL;
1029#else
1030 ;
1031#endif
1032
1033 if (pass & FR_PREAUTH) {
1034 READ_ENTER(&ipf_auth);
1035 if ((fin->fin_fr = ipauth) &&
1036 (pass = fr_scanlist(0, ip, fin, m))) {
1037 ATOMIC_INCL(fr_authstats.fas_hits);
1038 } else {
1039 ATOMIC_INCL(fr_authstats.fas_miss);
1040 }
1041 RWLOCK_EXIT(&ipf_auth);
1042 }
1043
1044 fin->fin_fr = fr;
1045 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
1046 if (fin->fin_fi.fi_fl & FI_FRAG) {
1047 if (ipfr_newfrag(ip, fin, pass) == -1) {
1048 ATOMIC_INCL(frstats[out].fr_bnfr);
1049 } else {
1050 ATOMIC_INCL(frstats[out].fr_nfr);
1051 }
1052 } else {
1053 ATOMIC_INCL(frstats[out].fr_cfr);
1054 }
1055 }
1056 if (pass & FR_KEEPSTATE) {
1057 if (fr_addstate(ip, fin, 0) == NULL) {
1058 ATOMIC_INCL(frstats[out].fr_bads);
1059 } else {
1060 ATOMIC_INCL(frstats[out].fr_ads);
1061 }
1062 }
1063 } else if (fr != NULL) {
1064 pass = fr->fr_flags;
1065 if (pass & FR_LOGFIRST)
1066 pass &= ~(FR_LOGFIRST|FR_LOG);
1067 }
1068
1069#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
1070 if (securelevel <= 0)
1071#endif
1072 if (fr && fr->fr_func && !(pass & FR_CALLNOW))
1073 pass = (*fr->fr_func)(pass, ip, fin);
1074
1075 /*
1076 * Only count/translate packets which will be passed on, out the
1077 * interface.
1078 */
1079 if (out && (pass & FR_PASS)) {
1080#ifdef USE_INET6
1081 if (v == 6)
1082 list = ipacct6[1][fr_active];
1083 else
1084#endif
1085 list = ipacct[1][fr_active];
1086 if ((fin->fin_fr = list) &&
1087 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
1088 ATOMIC_INCL(frstats[1].fr_acct);
1089 }
1090 fin->fin_fr = fr;
1091 changed = ip_natout(ip, fin);
1092 } else
1093 fin->fin_fr = fr;
1094 RWLOCK_EXIT(&ipf_mutex);
1095
1096#ifdef IPFILTER_LOG
1097 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
1098 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
1099 pass |= FF_LOGNOMATCH;
1100 ATOMIC_INCL(frstats[out].fr_npkl);
1101 goto logit;
1102 } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
1103 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
1104 if ((pass & FR_LOGMASK) != FR_LOGP)
1105 pass |= FF_LOGPASS;
1106 ATOMIC_INCL(frstats[out].fr_ppkl);
1107 goto logit;
1108 } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
1109 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
1110 if ((pass & FR_LOGMASK) != FR_LOGB)
1111 pass |= FF_LOGBLOCK;
1112 ATOMIC_INCL(frstats[out].fr_bpkl);
1113logit:
1114 if (!IPLLOG(pass, ip, fin, m)) {
1115 ATOMIC_INCL(frstats[out].fr_skip);
1116 if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
1117 (FR_PASS|FR_LOGORBLOCK))
1118 pass ^= FR_PASS|FR_BLOCK;
1119 }
1120 }
1121 }
1122#endif /* IPFILTER_LOG */
1123
1124#ifndef __FreeBSD__
1125 if ((out) && (v == 4))
1126 ip->ip_id = htons(ip->ip_id);
1127#endif
1128
1129#ifdef _KERNEL
1130 /*
1131 * Only allow FR_DUP to work if a rule matched - it makes no sense to
1132 * set FR_DUP as a "default" as there are no instructions about where
1133 * to send the packet.
1134 */
1135 if (fr && (pass & FR_DUP))
1136# if SOLARIS
1137 mc = dupmsg(m);
1138# else
1139# ifndef linux
1140 mc = m_copy(m, 0, M_COPYALL);
1141# else
1142 ;
1143# endif
1144# endif
1145#endif
1146 if (pass & FR_PASS) {
1147 ATOMIC_INCL(frstats[out].fr_pass);
1148 } else if (pass & FR_BLOCK) {
1149 ATOMIC_INCL(frstats[out].fr_block);
1150 /*
1151 * Should we return an ICMP packet to indicate error
1152 * status passing through the packet filter ?
1153 * WARNING: ICMP error packets AND TCP RST packets should
1154 * ONLY be sent in repsonse to incoming packets. Sending them
1155 * in response to outbound packets can result in a panic on
1156 * some operating systems.
1157 */
1158 if (!out) {
1159#ifdef _KERNEL
1160 if (pass & FR_RETICMP) {
1161 int dst;
1162
1163 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1164 dst = 1;
1165 else
1166 dst = 0;
1167 send_icmp_err(ip, ICMP_UNREACH, fin, dst);
1168 ATOMIC_INCL(frstats[0].fr_ret);
1169 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1170 !(fin->fin_fi.fi_fl & FI_SHORT)) {
1171 if (send_reset(ip, fin) == 0) {
1172 ATOMIC_INCL(frstats[1].fr_ret);
1173 }
1174 }
1175#else
1176 if ((pass & FR_RETMASK) == FR_RETICMP) {
1177 verbose("- ICMP unreachable sent\n");
1178 ATOMIC_INCL(frstats[0].fr_ret);
1179 } else if ((pass & FR_RETMASK) == FR_FAKEICMP) {
1180 verbose("- forged ICMP unreachable sent\n");
1181 ATOMIC_INCL(frstats[0].fr_ret);
1182 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1183 !(fin->fin_fi.fi_fl & FI_SHORT)) {
1184 verbose("- TCP RST sent\n");
1185 ATOMIC_INCL(frstats[1].fr_ret);
1186 }
1187#endif
1188 } else {
1189 if (pass & FR_RETRST)
1190 error = ECONNRESET;
1191 }
1192 }
1193
1194 /*
1195 * If we didn't drop off the bottom of the list of rules (and thus
1196 * the 'current' rule fr is not NULL), then we may have some extra
1197 * instructions about what to do with a packet.
1198 * Once we're finished return to our caller, freeing the packet if
1199 * we are dropping it (* BSD ONLY *).
1200 */
1201 if ((changed == -1) && (pass & FR_PASS)) {
1202 pass &= ~FR_PASS;
1203 pass |= FR_BLOCK;
1204 }
1205#if defined(_KERNEL)
1206# if !SOLARIS
1207# if !defined(linux)
1208 if (fr) {
1209 frdest_t *fdp = &fr->fr_tif;
1210
1211 if (((pass & FR_FASTROUTE) && !out) ||
1212 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1213 if (ipfr_fastroute(m, fin, fdp) == 0)
1214 m = *mp = NULL;
1215 }
1216 if (mc)
1217 ipfr_fastroute(mc, fin, &fr->fr_dif);
1218 }
1219 if (!(pass & FR_PASS) && m)
1220 m_freem(m);
1221# ifdef __sgi
1222 else if (changed && up && m)
1223 m_copyback(m, 0, up, hbuf);
1224# endif
1225# endif /* !linux */
1226# else /* !SOLARIS */
1227 if (fr) {
1228 frdest_t *fdp = &fr->fr_tif;
1229
1230 if (((pass & FR_FASTROUTE) && !out) ||
1231 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1232 if (ipfr_fastroute(ip, m, mp, fin, fdp) == 0)
1233 m = *mp = NULL;
1234 }
1235 if (mc)
1236 ipfr_fastroute(ip, mc, mp, fin, &fr->fr_dif);
1237 }
1238# endif /* !SOLARIS */
1239 return (pass & FR_PASS) ? 0 : error;
1240#else /* _KERNEL */
1241 if (pass & FR_NOMATCH)
1242 return 1;
1243 if (pass & FR_PASS)
1244 return 0;
1245 if (pass & FR_AUTH)
1246 return -2;
1247 return -1;
1248#endif /* _KERNEL */
1249}
1250
1251
1252/*
1253 * ipf_cksum
1254 * addr should be 16bit aligned and len is in bytes.
1255 * length is in bytes
1256 */
1257u_short ipf_cksum(addr, len)
1258register u_short *addr;
1259register int len;
1260{
1261 register u_32_t sum = 0;
1262
1263 for (sum = 0; len > 1; len -= 2)
1264 sum += *addr++;
1265
1266 /* mop up an odd byte, if necessary */
1267 if (len == 1)
1268 sum += *(u_char *)addr;
1269
1270 /*
1271 * add back carry outs from top 16 bits to low 16 bits
1272 */
1273 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1274 sum += (sum >> 16); /* add carry */
1275 return (u_short)(~sum);
1276}
1277
1278
1279/*
1280 * NB: This function assumes we've pullup'd enough for all of the IP header
1281 * and the TCP header. We also assume that data blocks aren't allocated in
1282 * odd sizes.
1283 */
1284u_short fr_tcpsum(m, ip, tcp)
1285mb_t *m;
1286ip_t *ip;
1287tcphdr_t *tcp;
1288{
1289 u_short *sp, slen, ts;
1290 u_int sum, sum2;
1291 int hlen;
1292
1293 /*
1294 * Add up IP Header portion
1295 */
1296 hlen = ip->ip_hl << 2;
1297 slen = ip->ip_len - hlen;
1298 sum = htons((u_short)ip->ip_p);
1299 sum += htons(slen);
1300 sp = (u_short *)&ip->ip_src;
1301 sum += *sp++; /* ip_src */
1302 sum += *sp++;
1303 sum += *sp++; /* ip_dst */
1304 sum += *sp++;
1305 ts = tcp->th_sum;
1306 tcp->th_sum = 0;
1307#ifdef KERNEL
1308# if SOLARIS
1309 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
1310 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1311 sum2 = ~sum2 & 0xffff;
1312# else /* SOLARIS */
1313# if defined(BSD) || defined(sun)
1314# if BSD >= 199306
1315 m->m_data += hlen;
1316# else
1317 m->m_off += hlen;
1318# endif
1319 m->m_len -= hlen;
1320 sum2 = in_cksum(m, slen);
1321 m->m_len += hlen;
1322# if BSD >= 199306
1323 m->m_data -= hlen;
1324# else
1325 m->m_off -= hlen;
1326# endif
1327 /*
1328 * Both sum and sum2 are partial sums, so combine them together.
1329 */
1330 sum = (sum & 0xffff) + (sum >> 16);
1331 sum = ~sum & 0xffff;
1332 sum2 += sum;
1333 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1334# else /* defined(BSD) || defined(sun) */
1335{
1336 union {
1337 u_char c[2];
1338 u_short s;
1339 } bytes;
1340 u_short len = ip->ip_len;
1341# if defined(__sgi)
1342 int add;
1343# endif
1344
1345 /*
1346 * Add up IP Header portion
1347 */
1348 sp = (u_short *)&ip->ip_src;
1349 len -= (ip->ip_hl << 2);
1350 sum = ntohs(IPPROTO_TCP);
1351 sum += htons(len);
1352 sum += *sp++; /* ip_src */
1353 sum += *sp++;
1354 sum += *sp++; /* ip_dst */
1355 sum += *sp++;
1356 if (sp != (u_short *)tcp)
1357 sp = (u_short *)tcp;
1358 sum += *sp++; /* sport */
1359 sum += *sp++; /* dport */
1360 sum += *sp++; /* seq */
1361 sum += *sp++;
1362 sum += *sp++; /* ack */
1363 sum += *sp++;
1364 sum += *sp++; /* off */
1365 sum += *sp++; /* win */
1366 sum += *sp++; /* Skip over checksum */
1367 sum += *sp++; /* urp */
1368
1369# ifdef __sgi
1370 /*
1371 * In case we had to copy the IP & TCP header out of mbufs,
1372 * skip over the mbuf bits which are the header
1373 */
1374 if ((caddr_t)ip != mtod(m, caddr_t)) {
1375 hlen = (caddr_t)sp - (caddr_t)ip;
1376 while (hlen) {
1377 add = MIN(hlen, m->m_len);
1378 sp = (u_short *)(mtod(m, caddr_t) + add);
1379 hlen -= add;
1380 if (add == m->m_len) {
1381 m = m->m_next;
1382 if (!hlen) {
1383 if (!m)
1384 break;
1385 sp = mtod(m, u_short *);
1386 }
1387 PANIC((!m),("fr_tcpsum(1): not enough data"));
1388 }
1389 }
1390 }
1391# endif
1392
1393 if (!(len -= sizeof(*tcp)))
1394 goto nodata;
1395 while (len > 1) {
1396 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
1397 m = m->m_next;
1398 PANIC((!m),("fr_tcpsum(2): not enough data"));
1399 sp = mtod(m, u_short *);
1400 }
1401 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
1402 bytes.c[0] = *(u_char *)sp;
1403 m = m->m_next;
1404 PANIC((!m),("fr_tcpsum(3): not enough data"));
1405 sp = mtod(m, u_short *);
1406 bytes.c[1] = *(u_char *)sp;
1407 sum += bytes.s;
1408 sp = (u_short *)((u_char *)sp + 1);
1409 }
1410 if ((u_long)sp & 1) {
1411 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
1412 sum += bytes.s;
1413 } else
1414 sum += *sp++;
1415 len -= 2;
1416 }
1417 if (len)
1418 sum += ntohs(*(u_char *)sp << 8);
1419nodata:
1420 while (sum > 0xffff)
1421 sum = (sum & 0xffff) + (sum >> 16);
1422 sum2 = (u_short)(~sum & 0xffff);
1423}
1424# endif /* defined(BSD) || defined(sun) */
1425# endif /* SOLARIS */
1426#else /* KERNEL */
1427 sum2 = 0;
1428#endif /* KERNEL */
1429 tcp->th_sum = ts;
1430 return sum2;
1431}
1432
1433
1434#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
1435/*
1436 * Copyright (c) 1982, 1986, 1988, 1991, 1993
1437 * The Regents of the University of California. All rights reserved.
1438 *
1439 * Redistribution and use in source and binary forms, with or without
1440 * modification, are permitted provided that the following conditions
1441 * are met:
1442 * 1. Redistributions of source code must retain the above copyright
1443 * notice, this list of conditions and the following disclaimer.
1444 * 2. Redistributions in binary form must reproduce the above copyright
1445 * notice, this list of conditions and the following disclaimer in the
1446 * documentation and/or other materials provided with the distribution.
1447 * 3. All advertising materials mentioning features or use of this software
1448 * must display the following acknowledgement:
1449 * This product includes software developed by the University of
1450 * California, Berkeley and its contributors.
1451 * 4. Neither the name of the University nor the names of its contributors
1452 * may be used to endorse or promote products derived from this software
1453 * without specific prior written permission.
1454 *
1455 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1456 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1457 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1458 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1459 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1460 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1461 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1462 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1463 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1464 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1465 * SUCH DAMAGE.
1466 *
1467 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
1468 * $Id: fil.c,v 2.35.2.30 2000/12/17 05:49:22 darrenr Exp $
1469 */
1470/*
1471 * Copy data from an mbuf chain starting "off" bytes from the beginning,
1472 * continuing for "len" bytes, into the indicated buffer.
1473 */
1474void
1475m_copydata(m, off, len, cp)
1476 register mb_t *m;
1477 register int off;
1478 register int len;
1479 caddr_t cp;
1480{
1481 register unsigned count;
1482
1483 if (off < 0 || len < 0)
1484 panic("m_copydata");
1485 while (off > 0) {
1486 if (m == 0)
1487 panic("m_copydata");
1488 if (off < m->m_len)
1489 break;
1490 off -= m->m_len;
1491 m = m->m_next;
1492 }
1493 while (len > 0) {
1494 if (m == 0)
1495 panic("m_copydata");
1496 count = MIN(m->m_len - off, len);
1497 bcopy(mtod(m, caddr_t) + off, cp, count);
1498 len -= count;
1499 cp += count;
1500 off = 0;
1501 m = m->m_next;
1502 }
1503}
1504
1505
1506# ifndef linux
1507/*
1508 * Copy data from a buffer back into the indicated mbuf chain,
1509 * starting "off" bytes from the beginning, extending the mbuf
1510 * chain if necessary.
1511 */
1512void
1513m_copyback(m0, off, len, cp)
1514 struct mbuf *m0;
1515 register int off;
1516 register int len;
1517 caddr_t cp;
1518{
1519 register int mlen;
1520 register struct mbuf *m = m0, *n;
1521 int totlen = 0;
1522
1523 if (m0 == 0)
1524 return;
1525 while (off > (mlen = m->m_len)) {
1526 off -= mlen;
1527 totlen += mlen;
1528 if (m->m_next == 0) {
1529 n = m_getclr(M_DONTWAIT, m->m_type);
1530 if (n == 0)
1531 goto out;
1532 n->m_len = min(MLEN, len + off);
1533 m->m_next = n;
1534 }
1535 m = m->m_next;
1536 }
1537 while (len > 0) {
1538 mlen = min (m->m_len - off, len);
1539 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
1540 cp += mlen;
1541 len -= mlen;
1542 mlen += off;
1543 off = 0;
1544 totlen += mlen;
1545 if (len == 0)
1546 break;
1547 if (m->m_next == 0) {
1548 n = m_get(M_DONTWAIT, m->m_type);
1549 if (n == 0)
1550 break;
1551 n->m_len = min(MLEN, len);
1552 m->m_next = n;
1553 }
1554 m = m->m_next;
1555 }
1556out:
1557#if 0
1558 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
1559 m->m_pkthdr.len = totlen;
1560#endif
1561 return;
1562}
1563# endif /* linux */
1564#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
1565
1566
1567frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
1568u_32_t num, flags;
1569minor_t which;
1570int set;
1571frgroup_t ***fgpp;
1572{
1573 frgroup_t *fg, **fgp;
1574
1575 if (which == IPL_LOGAUTH)
1576 fgp = &ipfgroups[2][set];
1577 else if (flags & FR_ACCOUNT)
1578 fgp = &ipfgroups[1][set];
1579 else if (flags & (FR_OUTQUE|FR_INQUE))
1580 fgp = &ipfgroups[0][set];
1581 else
1582 return NULL;
1583 num &= 0xffff;
1584
1585 while ((fg = *fgp))
1586 if (fg->fg_num == num)
1587 break;
1588 else
1589 fgp = &fg->fg_next;
1590 if (fgpp)
1591 *fgpp = fgp;
1592 return fg;
1593}
1594
1595
1596frgroup_t *fr_addgroup(num, fp, which, set)
1597u_32_t num;
1598frentry_t *fp;
1599minor_t which;
1600int set;
1601{
1602 frgroup_t *fg, **fgp;
1603
1604 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
1605 return fg;
1606
1607 KMALLOC(fg, frgroup_t *);
1608 if (fg) {
1609 fg->fg_num = num;
1610 fg->fg_next = *fgp;
1611 fg->fg_head = fp;
1612 fg->fg_start = &fp->fr_grp;
1613 *fgp = fg;
1614 }
1615 return fg;
1616}
1617
1618
1619void fr_delgroup(num, flags, which, set)
1620u_32_t num, flags;
1621minor_t which;
1622int set;
1623{
1624 frgroup_t *fg, **fgp;
1625
1626 if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
1627 return;
1628
1629 *fgp = fg->fg_next;
1630 KFREE(fg);
1631}
1632
1633
1634
1635/*
1636 * recursively flush rules from the list, descending groups as they are
1637 * encountered. if a rule is the head of a group and it has lost all its
1638 * group members, then also delete the group reference.
1639 */
1640static int frflushlist(set, unit, nfreedp, listp)
1641int set;
1642minor_t unit;
1643int *nfreedp;
1644frentry_t **listp;
1645{
1646 register int freed = 0, i;
1647 register frentry_t *fp;
1648
1649 while ((fp = *listp)) {
1650 *listp = fp->fr_next;
1651 if (fp->fr_grp) {
1652 i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
1653 MUTEX_ENTER(&ipf_rw);
1654 fp->fr_ref -= i;
1655 MUTEX_EXIT(&ipf_rw);
1656 }
1657
1658 ATOMIC_DEC32(fp->fr_ref);
1659 if (fp->fr_grhead) {
1660 fr_delgroup(fp->fr_grhead, fp->fr_flags,
1661 unit, set);
1662 fp->fr_grhead = 0;
1663 }
1664 if (fp->fr_ref == 0) {
1665 KFREE(fp);
1666 freed++;
1667 } else
1668 fp->fr_next = NULL;
1669 }
1670 *nfreedp += freed;
1671 return freed;
1672}
1673
1674
1675int frflush(unit, flags)
1676minor_t unit;
1677int flags;
1678{
1679 int flushed = 0, set;
1680
1681 if (unit != IPL_LOGIPF)
1682 return 0;
1683 WRITE_ENTER(&ipf_mutex);
1684 bzero((char *)frcache, sizeof(frcache[0]) * 2);
1685
1686 set = fr_active;
1687 if (flags & FR_INACTIVE)
1688 set = 1 - set;
1689
1690 if (flags & FR_OUTQUE) {
1691#ifdef USE_INET6
1692 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]);
1693 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]);
1694#endif
1695 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
1696 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
1697 }
1698 if (flags & FR_INQUE) {
1699#ifdef USE_INET6
1700 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]);
1701 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]);
1702#endif
1703 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
1704 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
1705 }
1706 RWLOCK_EXIT(&ipf_mutex);
1707 return flushed;
1708}
1709
1710
1711char *memstr(src, dst, slen, dlen)
1712char *src, *dst;
1713int slen, dlen;
1714{
1715 char *s = NULL;
1716
1717 while (dlen >= slen) {
1718 if (bcmp(src, dst, slen) == 0) {
1719 s = dst;
1720 break;
1721 }
1722 dst++;
1723 dlen--;
1724 }
1725 return s;
1726}
1727
1728
1729void fixskip(listp, rp, addremove)
1730frentry_t **listp, *rp;
1731int addremove;
1732{
1733 frentry_t *fp;
1734 int rules = 0, rn = 0;
1735
1736 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
1737 ;
1738
1739 if (!fp)
1740 return;
1741
1742 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
1743 if (fp->fr_skip && (rn + fp->fr_skip >= rules))
1744 fp->fr_skip += addremove;
1745}
1746
1747
1748#ifdef _KERNEL
1749/*
1750 * count consecutive 1's in bit mask. If the mask generated by counting
1751 * consecutive 1's is different to that passed, return -1, else return #
1752 * of bits.
1753 */
1754int countbits(ip)
1755u_32_t ip;
1756{
1757 u_32_t ipn;
1758 int cnt = 0, i, j;
1759
1760 ip = ipn = ntohl(ip);
1761 for (i = 32; i; i--, ipn *= 2)
1762 if (ipn & 0x80000000)
1763 cnt++;
1764 else
1765 break;
1766 ipn = 0;
1767 for (i = 32, j = cnt; i; i--, j--) {
1768 ipn *= 2;
1769 if (j > 0)
1770 ipn++;
1771 }
1772 if (ipn == ip)
1773 return cnt;
1774 return -1;
1775}
1776
1777
1778/*
1779 * return the first IP Address associated with an interface
1780 */
1781int fr_ifpaddr(v, ifptr, inp)
1782int v;
1783void *ifptr;
1784struct in_addr *inp;
1785{
1786# ifdef USE_INET6
1787 struct in6_addr *inp6 = NULL;
1788# endif
1789# if SOLARIS
1790 ill_t *ill = ifptr;
1791# else
1792 struct ifnet *ifp = ifptr;
1793# endif
1794 struct in_addr in;
1795
1796# if SOLARIS
1797# ifdef USE_INET6
1798 if (v == 6) {
1799 struct in6_addr in6;
1800
1801 /*
1802 * First is always link local.
1803 */
1804 if (ill->ill_ipif->ipif_next)
1805 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
1806 else
1807 bzero((char *)&in6, sizeof(in6));
1808 bcopy((char *)&in6, (char *)inp, sizeof(in6));
1809 } else
1810# endif
1811 {
1812 in.s_addr = ill->ill_ipif->ipif_local_addr;
1813 *inp = in;
1814 }
1815# else /* SOLARIS */
1816# if linux
1817 ;
1818# else /* linux */
1819 struct sockaddr_in *sin;
1820 struct ifaddr *ifa;
1821
1822# if (__FreeBSD_version >= 300000)
1823 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1824# else
1825# if defined(__NetBSD__) || defined(__OpenBSD__)
1826 ifa = ifp->if_addrlist.tqh_first;
1827# else
1828# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
1829 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
1830# else
1831 ifa = ifp->if_addrlist;
1832# endif
1833# endif /* __NetBSD__ || __OpenBSD__ */
1834# endif /* __FreeBSD_version >= 300000 */
1835# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
1836 sin = (struct sockaddr_in *)&ifa->ifa_addr;
1837# else
1838 sin = (struct sockaddr_in *)ifa->ifa_addr;
1839 while (sin && ifa) {
1840 if ((v == 4) && (sin->sin_family == AF_INET))
1841 break;
1842# ifdef USE_INET6
1843 if ((v == 6) && (sin->sin_family == AF_INET6)) {
1844 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
1845 if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
1846 !IN6_IS_ADDR_LOOPBACK(inp6))
1847 break;
1848 }
1849# endif
1850# if (__FreeBSD_version >= 300000)
1851 ifa = TAILQ_NEXT(ifa, ifa_link);
1852# else
1853# if defined(__NetBSD__) || defined(__OpenBSD__)
1854 ifa = ifa->ifa_list.tqe_next;
1855# else
1856 ifa = ifa->ifa_next;
1857# endif
1858# endif /* __FreeBSD_version >= 300000 */
1859 if (ifa)
1860 sin = (struct sockaddr_in *)ifa->ifa_addr;
1861 }
1862 if (ifa == NULL)
1863 sin = NULL;
1864 if (sin == NULL)
1865 return -1;
1866# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
1867# ifdef USE_INET6
1868 if (v == 6)
1869 bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
1870 else
1871# endif
1872 {
1873 in = sin->sin_addr;
1874 *inp = in;
1875 }
1876# endif /* linux */
1877# endif /* SOLARIS */
1878 return 0;
1879}
1880
1881
1882static void frsynclist(fr)
1883register frentry_t *fr;
1884{
1885 for (; fr; fr = fr->fr_next) {
1886 if (fr->fr_ifa != NULL) {
1887 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v);
1888 if (fr->fr_ifa == NULL)
1889 fr->fr_ifa = (void *)-1;
1890 }
1891 if (fr->fr_grp)
1892 frsynclist(fr->fr_grp);
1893 }
1894}
1895
1896
1897void frsync()
1898{
1899# if !SOLARIS
1900 register struct ifnet *ifp;
1901
1902# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
1903 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
1904# if (NetBSD >= 199905) || defined(__OpenBSD__)
1905 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
1906# else
1907 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
1908# endif
1909# else
1910 for (ifp = ifnet; ifp; ifp = ifp->if_next)
1911# endif
1912 {
1913 ip_natsync(ifp);
1914 ip_statesync(ifp);
1915 }
1916 ip_natsync((struct ifnet *)-1);
1917# endif
1918
1919 WRITE_ENTER(&ipf_mutex);
1920 frsynclist(ipacct[0][fr_active]);
1921 frsynclist(ipacct[1][fr_active]);
1922 frsynclist(ipfilter[0][fr_active]);
1923 frsynclist(ipfilter[1][fr_active]);
1924#ifdef USE_INET6
1925 frsynclist(ipacct6[0][fr_active]);
1926 frsynclist(ipacct6[1][fr_active]);
1927 frsynclist(ipfilter6[0][fr_active]);
1928 frsynclist(ipfilter6[1][fr_active]);
1929#endif
1930 RWLOCK_EXIT(&ipf_mutex);
1931}
1932
1933
1934/*
1935 * In the functions below, bcopy() is called because the pointer being
1936 * copied _from_ in this instance is a pointer to a char buf (which could
1937 * end up being unaligned) and on the kernel's local stack.
1938 */
1939int ircopyptr(a, b, c)
1940void *a, *b;
1941size_t c;
1942{
1943 caddr_t ca;
1944 int err;
1945
1946#if SOLARIS
1947 if (copyin(a, (char *)&ca, sizeof(ca)))
1948 return EFAULT;
1949#else
1950 bcopy(a, &ca, sizeof(ca));
1951#endif
1952 err = copyin(ca, b, c);
1953 if (err)
1954 err = EFAULT;
1955 return err;
1956}
1957
1958
1959int iwcopyptr(a, b, c)
1960void *a, *b;
1961size_t c;
1962{
1963 caddr_t ca;
1964 int err;
1965
1966#if SOLARIS
1967 if (copyin(b, (char *)&ca, sizeof(ca)))
1968 return EFAULT;
1969#else
1970 bcopy(b, &ca, sizeof(ca));
1971#endif
1972 err = copyout(a, ca, c);
1973 if (err)
1974 err = EFAULT;
1975 return err;
1976}
1977
1978#else /* _KERNEL */
1979
1980
1981/*
1982 * return the first IP Address associated with an interface
1983 */
1984int fr_ifpaddr(v, ifptr, inp)
1985int v;
1986void *ifptr;
1987struct in_addr *inp;
1988{
1989 return 0;
1990}
1991
1992
1993int ircopyptr(a, b, c)
1994void *a, *b;
1995size_t c;
1996{
1997 caddr_t ca;
1998
1999 bcopy(a, &ca, sizeof(ca));
2000 bcopy(ca, b, c);
2001 return 0;
2002}
2003
2004
2005int iwcopyptr(a, b, c)
2006void *a, *b;
2007size_t c;
2008{
2009 caddr_t ca;
2010
2011 bcopy(b, &ca, sizeof(ca));
2012 bcopy(a, ca, c);
2013 return 0;
2014}
2015
2016
2017#endif
2018
2019
2020int fr_lock(data, lockp)
2021caddr_t data;
2022int *lockp;
2023{
2024 int arg, error;
2025
2026 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
2027 if (!error) {
2028 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
2029 if (!error)
2030 *lockp = arg;
2031 }
2032 return error;
2033}
2034
2035
2036void fr_getstat(fiop)
2037friostat_t *fiop;
2038{
2039 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
2040 fiop->f_locks[0] = fr_state_lock;
2041 fiop->f_locks[1] = fr_nat_lock;
2042 fiop->f_locks[2] = fr_frag_lock;
2043 fiop->f_locks[3] = fr_auth_lock;
2044 fiop->f_fin[0] = ipfilter[0][0];
2045 fiop->f_fin[1] = ipfilter[0][1];
2046 fiop->f_fout[0] = ipfilter[1][0];
2047 fiop->f_fout[1] = ipfilter[1][1];
2048 fiop->f_acctin[0] = ipacct[0][0];
2049 fiop->f_acctin[1] = ipacct[0][1];
2050 fiop->f_acctout[0] = ipacct[1][0];
2051 fiop->f_acctout[1] = ipacct[1][1];
2052#ifdef USE_INET6
2053 fiop->f_fin6[0] = ipfilter6[0][0];
2054 fiop->f_fin6[1] = ipfilter6[0][1];
2055 fiop->f_fout6[0] = ipfilter6[1][0];
2056 fiop->f_fout6[1] = ipfilter6[1][1];
2057 fiop->f_acctin6[0] = ipacct6[0][0];
2058 fiop->f_acctin6[1] = ipacct6[0][1];
2059 fiop->f_acctout6[0] = ipacct6[1][0];
2060 fiop->f_acctout6[1] = ipacct6[1][1];
2061#else
2062 fiop->f_fin6[0] = NULL;
2063 fiop->f_fin6[1] = NULL;
2064 fiop->f_fout6[0] = NULL;
2065 fiop->f_fout6[1] = NULL;
2066 fiop->f_acctin6[0] = NULL;
2067 fiop->f_acctin6[1] = NULL;
2068 fiop->f_acctout6[0] = NULL;
2069 fiop->f_acctout6[1] = NULL;
2070#endif
2071 fiop->f_active = fr_active;
2072 fiop->f_froute[0] = ipl_frouteok[0];
2073 fiop->f_froute[1] = ipl_frouteok[1];
2074
2075 fiop->f_running = fr_running;
2076 fiop->f_groups[0][0] = ipfgroups[0][0];
2077 fiop->f_groups[0][1] = ipfgroups[0][1];
2078 fiop->f_groups[1][0] = ipfgroups[1][0];
2079 fiop->f_groups[1][1] = ipfgroups[1][1];
2080 fiop->f_groups[2][0] = ipfgroups[2][0];
2081 fiop->f_groups[2][1] = ipfgroups[2][1];
2082#ifdef IPFILTER_LOG
2083 fiop->f_logging = 1;
2084#else
2085 fiop->f_logging = 0;
2086#endif
2087 fiop->f_defpass = fr_pass;
2088 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version));
2089}
2090
2091
2092#ifdef USE_INET6
2093int icmptoicmp6types[ICMP_MAXTYPE+1] = {
2094 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
2095 -1, /* 1: UNUSED */
2096 -1, /* 2: UNUSED */
2097 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
2098 -1, /* 4: ICMP_SOURCEQUENCH */
2099 ND_REDIRECT, /* 5: ICMP_REDIRECT */
2100 -1, /* 6: UNUSED */
2101 -1, /* 7: UNUSED */
2102 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
2103 -1, /* 9: UNUSED */
2104 -1, /* 10: UNUSED */
2105 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
2106 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
2107 -1, /* 13: ICMP_TSTAMP */
2108 -1, /* 14: ICMP_TSTAMPREPLY */
2109 -1, /* 15: ICMP_IREQ */
2110 -1, /* 16: ICMP_IREQREPLY */
2111 -1, /* 17: ICMP_MASKREQ */
2112 -1, /* 18: ICMP_MASKREPLY */
2113};
2114
2115
2116int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
2117 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
2118 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
2119 -1, /* 2: ICMP_UNREACH_PROTOCOL */
2120 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
2121 -1, /* 4: ICMP_UNREACH_NEEDFRAG */
2122 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
2123 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
2124 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
2125 -1, /* 8: ICMP_UNREACH_ISOLATED */
2126 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
2127 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
2128 -1, /* 11: ICMP_UNREACH_TOSNET */
2129 -1, /* 12: ICMP_UNREACH_TOSHOST */
2130 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
2131};
2132#endif
2 * Copyright (C) 1993-2000 by Darren Reed.
3 *
4 * Redistribution and use in source and binary forms are permitted
5 * provided that this notice is preserved and due credit is given
6 * to the original author and the contributors.
7 */
8#if !defined(lint)
9static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
10/* static const char rcsid[] = "@(#)$Id: fil.c,v 2.3.2.16 2000/01/27 08:49:37 darrenr Exp $"; */
11static const char rcsid[] = "@(#)$FreeBSD: head/sys/contrib/ipfilter/netinet/fil.c 72006 2001-02-04 14:26:56Z darrenr $";
12#endif
13
14#include <sys/errno.h>
15#include <sys/types.h>
16#include <sys/param.h>
17#include <sys/time.h>
18#include <sys/file.h>
19#if defined(__NetBSD__) && (NetBSD >= 199905) && !defined(IPFILTER_LKM) && \
20 defined(_KERNEL)
21# include "opt_ipfilter_log.h"
22#endif
23#if (defined(KERNEL) || defined(_KERNEL)) && defined(__FreeBSD_version) && \
24 (__FreeBSD_version >= 220000)
25# if (__FreeBSD_version >= 400000)
26# ifndef KLD_MODULE
27# include "opt_inet6.h"
28# endif
29# if (__FreeBSD_version == 400019)
30# define CSUM_DELAY_DATA
31# endif
32# endif
33# include <sys/filio.h>
34# include <sys/fcntl.h>
35#else
36# include <sys/ioctl.h>
37#endif
38#if (defined(_KERNEL) || defined(KERNEL)) && !defined(linux)
39# include <sys/systm.h>
40#else
41# include <stdio.h>
42# include <string.h>
43# include <stdlib.h>
44#endif
45#include <sys/uio.h>
46#if !defined(__SVR4) && !defined(__svr4__)
47# ifndef linux
48# include <sys/mbuf.h>
49# endif
50#else
51# include <sys/byteorder.h>
52# if SOLARIS2 < 5
53# include <sys/dditypes.h>
54# endif
55# include <sys/stream.h>
56#endif
57#ifndef linux
58# include <sys/protosw.h>
59# include <sys/socket.h>
60#endif
61#include <net/if.h>
62#ifdef sun
63# include <net/af.h>
64#endif
65#include <net/route.h>
66#include <netinet/in.h>
67#include <netinet/in_systm.h>
68#include <netinet/ip.h>
69#ifndef linux
70# include <netinet/ip_var.h>
71#endif
72#if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
73# include <sys/hashing.h>
74# include <netinet/in_var.h>
75#endif
76#include <netinet/tcp.h>
77#include <netinet/udp.h>
78#include <netinet/ip_icmp.h>
79#include "netinet/ip_compat.h"
80#ifdef USE_INET6
81# include <netinet/icmp6.h>
82# if !SOLARIS && defined(_KERNEL)
83# include <netinet6/in6_var.h>
84# endif
85#endif
86#include <netinet/tcpip.h>
87#include "netinet/ip_fil.h"
88#include "netinet/ip_proxy.h"
89#include "netinet/ip_nat.h"
90#include "netinet/ip_frag.h"
91#include "netinet/ip_state.h"
92#include "netinet/ip_auth.h"
93# if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
94# include <sys/malloc.h>
95# if defined(_KERNEL) && !defined(IPFILTER_LKM)
96# include "opt_ipfilter.h"
97# endif
98# endif
99#ifndef MIN
100# define MIN(a,b) (((a)<(b))?(a):(b))
101#endif
102#include "netinet/ipl.h"
103
104#include <machine/in_cksum.h>
105
106#ifndef _KERNEL
107# include "ipf.h"
108# include "ipt.h"
109extern int opts;
110
111# define FR_VERBOSE(verb_pr) verbose verb_pr
112# define FR_DEBUG(verb_pr) debug verb_pr
113# define IPLLOG(a, c, d, e) ipllog()
114#else /* #ifndef _KERNEL */
115# define FR_VERBOSE(verb_pr)
116# define FR_DEBUG(verb_pr)
117# define IPLLOG(a, c, d, e) ipflog(a, c, d, e)
118# if SOLARIS || defined(__sgi)
119extern KRWLOCK_T ipf_mutex, ipf_auth, ipf_nat;
120extern kmutex_t ipf_rw;
121# endif
122# if SOLARIS
123# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, \
124 ip, qif)
125# else /* SOLARIS */
126# define FR_NEWAUTH(m, fi, ip, qif) fr_newauth((mb_t *)m, fi, ip)
127# endif /* SOLARIS || __sgi */
128#endif /* _KERNEL */
129
130
131struct filterstats frstats[2] = {{0,0,0,0,0},{0,0,0,0,0}};
132struct frentry *ipfilter[2][2] = { { NULL, NULL }, { NULL, NULL } },
133#ifdef USE_INET6
134 *ipfilter6[2][2] = { { NULL, NULL }, { NULL, NULL } },
135 *ipacct6[2][2] = { { NULL, NULL }, { NULL, NULL } },
136#endif
137 *ipacct[2][2] = { { NULL, NULL }, { NULL, NULL } };
138struct frgroup *ipfgroups[3][2];
139int fr_flags = IPF_LOGGING;
140int fr_active = 0;
141int fr_chksrc = 0;
142int fr_minttl = 3;
143int fr_minttllog = 1;
144#if defined(IPFILTER_DEFAULT_BLOCK)
145int fr_pass = FR_NOMATCH|FR_BLOCK;
146#else
147int fr_pass = (IPF_DEFAULT_PASS|FR_NOMATCH);
148#endif
149char ipfilter_version[] = IPL_VERSION;
150
151fr_info_t frcache[2];
152
153static int frflushlist __P((int, minor_t, int *, frentry_t **));
154#ifdef _KERNEL
155static void frsynclist __P((frentry_t *));
156#endif
157
158
159/*
160 * bit values for identifying presence of individual IP options
161 */
162struct optlist ipopts[20] = {
163 { IPOPT_NOP, 0x000001 },
164 { IPOPT_RR, 0x000002 },
165 { IPOPT_ZSU, 0x000004 },
166 { IPOPT_MTUP, 0x000008 },
167 { IPOPT_MTUR, 0x000010 },
168 { IPOPT_ENCODE, 0x000020 },
169 { IPOPT_TS, 0x000040 },
170 { IPOPT_TR, 0x000080 },
171 { IPOPT_SECURITY, 0x000100 },
172 { IPOPT_LSRR, 0x000200 },
173 { IPOPT_E_SEC, 0x000400 },
174 { IPOPT_CIPSO, 0x000800 },
175 { IPOPT_SATID, 0x001000 },
176 { IPOPT_SSRR, 0x002000 },
177 { IPOPT_ADDEXT, 0x004000 },
178 { IPOPT_VISA, 0x008000 },
179 { IPOPT_IMITD, 0x010000 },
180 { IPOPT_EIP, 0x020000 },
181 { IPOPT_FINN, 0x040000 },
182 { 0, 0x000000 }
183};
184
185/*
186 * bit values for identifying presence of individual IP security options
187 */
188struct optlist secopt[8] = {
189 { IPSO_CLASS_RES4, 0x01 },
190 { IPSO_CLASS_TOPS, 0x02 },
191 { IPSO_CLASS_SECR, 0x04 },
192 { IPSO_CLASS_RES3, 0x08 },
193 { IPSO_CLASS_CONF, 0x10 },
194 { IPSO_CLASS_UNCL, 0x20 },
195 { IPSO_CLASS_RES2, 0x40 },
196 { IPSO_CLASS_RES1, 0x80 }
197};
198
199
200/*
201 * compact the IP header into a structure which contains just the info.
202 * which is useful for comparing IP headers with.
203 */
204void fr_makefrip(hlen, ip, fin)
205int hlen;
206ip_t *ip;
207fr_info_t *fin;
208{
209 u_short optmsk = 0, secmsk = 0, auth = 0;
210 int i, mv, ol, off, p, plen, v;
211 fr_ip_t *fi = &fin->fin_fi;
212 struct optlist *op;
213 u_char *s, opt;
214 tcphdr_t *tcp;
215
216 fin->fin_rev = 0;
217 fin->fin_fr = NULL;
218 fin->fin_tcpf = 0;
219 fin->fin_data[0] = 0;
220 fin->fin_data[1] = 0;
221 fin->fin_rule = -1;
222 fin->fin_group = -1;
223#ifdef _KERNEL
224 fin->fin_icode = ipl_unreach;
225#endif
226 v = fin->fin_v;
227 fi->fi_v = v;
228 fin->fin_hlen = hlen;
229 if (v == 4) {
230 fin->fin_id = ip->ip_id;
231 fi->fi_tos = ip->ip_tos;
232 off = (ip->ip_off & IP_OFFMASK) << 3;
233 tcp = (tcphdr_t *)((char *)ip + hlen);
234 (*(((u_short *)fi) + 1)) = (*(((u_short *)ip) + 4));
235 fi->fi_src.i6[1] = 0;
236 fi->fi_src.i6[2] = 0;
237 fi->fi_src.i6[3] = 0;
238 fi->fi_dst.i6[1] = 0;
239 fi->fi_dst.i6[2] = 0;
240 fi->fi_dst.i6[3] = 0;
241 fi->fi_saddr = ip->ip_src.s_addr;
242 fi->fi_daddr = ip->ip_dst.s_addr;
243 p = ip->ip_p;
244 fi->fi_fl = (hlen > sizeof(ip_t)) ? FI_OPTIONS : 0;
245 if (ip->ip_off & 0x3fff)
246 fi->fi_fl |= FI_FRAG;
247 plen = ip->ip_len;
248 fin->fin_dlen = plen - hlen;
249 }
250#ifdef USE_INET6
251 else if (v == 6) {
252 ip6_t *ip6 = (ip6_t *)ip;
253
254 off = 0;
255 p = ip6->ip6_nxt;
256 fi->fi_p = p;
257 fi->fi_ttl = ip6->ip6_hlim;
258 tcp = (tcphdr_t *)(ip6 + 1);
259 fi->fi_src.in6 = ip6->ip6_src;
260 fi->fi_dst.in6 = ip6->ip6_dst;
261 fin->fin_id = (u_short)(ip6->ip6_flow & 0xffff);
262 fi->fi_tos = 0;
263 fi->fi_fl = 0;
264 plen = ntohs(ip6->ip6_plen);
265 fin->fin_dlen = plen;
266 }
267#endif
268 else
269 return;
270
271 fin->fin_off = off;
272 fin->fin_plen = plen;
273 fin->fin_dp = (void *)tcp;
274
275 switch (p)
276 {
277#ifdef USE_INET6
278 case IPPROTO_ICMPV6 :
279 {
280 int minicmpsz = sizeof(struct icmp6_hdr);
281 struct icmp6_hdr *icmp6;
282
283 if (fin->fin_dlen > 1) {
284 fin->fin_data[0] = *(u_short *)tcp;
285
286 icmp6 = (struct icmp6_hdr *)tcp;
287
288 switch (icmp6->icmp6_type)
289 {
290 case ICMP6_ECHO_REPLY :
291 case ICMP6_ECHO_REQUEST :
292 minicmpsz = ICMP6ERR_MINPKTLEN;
293 break;
294 case ICMP6_DST_UNREACH :
295 case ICMP6_PACKET_TOO_BIG :
296 case ICMP6_TIME_EXCEEDED :
297 case ICMP6_PARAM_PROB :
298 minicmpsz = ICMP6ERR_IPICMPHLEN;
299 break;
300 default :
301 break;
302 }
303 }
304
305 if (!(plen >= hlen + minicmpsz))
306 fi->fi_fl |= FI_SHORT;
307
308 break;
309 }
310#endif
311 case IPPROTO_ICMP :
312 {
313 int minicmpsz = sizeof(struct icmp);
314 icmphdr_t *icmp;
315
316 if (!off && (fin->fin_dlen > 1)) {
317 fin->fin_data[0] = *(u_short *)tcp;
318
319 icmp = (icmphdr_t *)tcp;
320
321 if (icmp->icmp_type == ICMP_ECHOREPLY ||
322 icmp->icmp_type == ICMP_ECHO)
323 minicmpsz = ICMP_MINLEN;
324
325 /*
326 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
327 * 3*timestamp(3*4)
328 */
329 else if (icmp->icmp_type == ICMP_TSTAMP ||
330 icmp->icmp_type == ICMP_TSTAMPREPLY)
331 minicmpsz = 20;
332
333 /*
334 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
335 * mask(4)
336 */
337 else if (icmp->icmp_type == ICMP_MASKREQ ||
338 icmp->icmp_type == ICMP_MASKREPLY)
339 minicmpsz = 12;
340 }
341
342 if ((!(plen >= hlen + minicmpsz) && !off) ||
343 (off && off < sizeof(struct icmp)))
344 fi->fi_fl |= FI_SHORT;
345
346 break;
347 }
348 case IPPROTO_TCP :
349 fi->fi_fl |= FI_TCPUDP;
350#ifdef USE_INET6
351 if (v == 6) {
352 if (plen < sizeof(struct tcphdr))
353 fi->fi_fl |= FI_SHORT;
354 } else
355#endif
356 if (v == 4) {
357 if ((!IPMINLEN(ip, tcphdr) && !off) ||
358 (off && off < sizeof(struct tcphdr)))
359 fi->fi_fl |= FI_SHORT;
360 }
361 if (!(fi->fi_fl & FI_SHORT) && !off)
362 fin->fin_tcpf = tcp->th_flags;
363 goto getports;
364 case IPPROTO_UDP :
365 fi->fi_fl |= FI_TCPUDP;
366#ifdef USE_INET6
367 if (v == 6) {
368 if (plen < sizeof(struct udphdr))
369 fi->fi_fl |= FI_SHORT;
370 } else
371#endif
372 if (v == 4) {
373 if ((!IPMINLEN(ip, udphdr) && !off) ||
374 (off && off < sizeof(struct udphdr)))
375 fi->fi_fl |= FI_SHORT;
376 }
377getports:
378 if (!off && (fin->fin_dlen > 3)) {
379 fin->fin_data[0] = ntohs(tcp->th_sport);
380 fin->fin_data[1] = ntohs(tcp->th_dport);
381 }
382 break;
383 default :
384 break;
385 }
386
387#ifdef USE_INET6
388 if (v == 6) {
389 fi->fi_optmsk = 0;
390 fi->fi_secmsk = 0;
391 fi->fi_auth = 0;
392 return;
393 }
394#endif
395
396 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
397 opt = *s;
398 if (opt == '\0')
399 break;
400 else if (opt == IPOPT_NOP)
401 ol = 1;
402 else {
403 if (hlen < 2)
404 break;
405 ol = (int)*(s + 1);
406 if (ol < 2 || ol > hlen)
407 break;
408 }
409 for (i = 9, mv = 4; mv >= 0; ) {
410 op = ipopts + i;
411 if (opt == (u_char)op->ol_val) {
412 optmsk |= op->ol_bit;
413 if (opt == IPOPT_SECURITY) {
414 struct optlist *sp;
415 u_char sec;
416 int j, m;
417
418 sec = *(s + 2); /* classification */
419 for (j = 3, m = 2; m >= 0; ) {
420 sp = secopt + j;
421 if (sec == sp->ol_val) {
422 secmsk |= sp->ol_bit;
423 auth = *(s + 3);
424 auth *= 256;
425 auth += *(s + 4);
426 break;
427 }
428 if (sec < sp->ol_val)
429 j -= m--;
430 else
431 j += m--;
432 }
433 }
434 break;
435 }
436 if (opt < op->ol_val)
437 i -= mv--;
438 else
439 i += mv--;
440 }
441 hlen -= ol;
442 s += ol;
443 }
444 if (auth && !(auth & 0x0100))
445 auth &= 0xff00;
446 fi->fi_optmsk = optmsk;
447 fi->fi_secmsk = secmsk;
448 fi->fi_auth = auth;
449}
450
451
452/*
453 * check an IP packet for TCP/UDP characteristics such as ports and flags.
454 */
455int fr_tcpudpchk(ft, fin)
456frtuc_t *ft;
457fr_info_t *fin;
458{
459 register u_short po, tup;
460 register char i;
461 register int err = 1;
462
463 /*
464 * Both ports should *always* be in the first fragment.
465 * So far, I cannot find any cases where they can not be.
466 *
467 * compare destination ports
468 */
469 if ((i = (int)ft->ftu_dcmp)) {
470 po = ft->ftu_dport;
471 tup = fin->fin_data[1];
472 /*
473 * Do opposite test to that required and
474 * continue if that succeeds.
475 */
476 if (!--i && tup != po) /* EQUAL */
477 err = 0;
478 else if (!--i && tup == po) /* NOTEQUAL */
479 err = 0;
480 else if (!--i && tup >= po) /* LESSTHAN */
481 err = 0;
482 else if (!--i && tup <= po) /* GREATERTHAN */
483 err = 0;
484 else if (!--i && tup > po) /* LT or EQ */
485 err = 0;
486 else if (!--i && tup < po) /* GT or EQ */
487 err = 0;
488 else if (!--i && /* Out of range */
489 (tup >= po && tup <= ft->ftu_dtop))
490 err = 0;
491 else if (!--i && /* In range */
492 (tup <= po || tup >= ft->ftu_dtop))
493 err = 0;
494 }
495 /*
496 * compare source ports
497 */
498 if (err && (i = (int)ft->ftu_scmp)) {
499 po = ft->ftu_sport;
500 tup = fin->fin_data[0];
501 if (!--i && tup != po)
502 err = 0;
503 else if (!--i && tup == po)
504 err = 0;
505 else if (!--i && tup >= po)
506 err = 0;
507 else if (!--i && tup <= po)
508 err = 0;
509 else if (!--i && tup > po)
510 err = 0;
511 else if (!--i && tup < po)
512 err = 0;
513 else if (!--i && /* Out of range */
514 (tup >= po && tup <= ft->ftu_stop))
515 err = 0;
516 else if (!--i && /* In range */
517 (tup <= po || tup >= ft->ftu_stop))
518 err = 0;
519 }
520
521 /*
522 * If we don't have all the TCP/UDP header, then how can we
523 * expect to do any sort of match on it ? If we were looking for
524 * TCP flags, then NO match. If not, then match (which should
525 * satisfy the "short" class too).
526 */
527 if (err && (fin->fin_fi.fi_p == IPPROTO_TCP)) {
528 if (fin->fin_fi.fi_fl & FI_SHORT)
529 return !(ft->ftu_tcpf | ft->ftu_tcpfm);
530 /*
531 * Match the flags ? If not, abort this match.
532 */
533 if (ft->ftu_tcpfm &&
534 ft->ftu_tcpf != (fin->fin_tcpf & ft->ftu_tcpfm)) {
535 FR_DEBUG(("f. %#x & %#x != %#x\n", fin->fin_tcpf,
536 ft->ftu_tcpfm, ft->ftu_tcpf));
537 err = 0;
538 }
539 }
540 return err;
541}
542
543/*
544 * Check the input/output list of rules for a match and result.
545 * Could be per interface, but this gets real nasty when you don't have
546 * kernel sauce.
547 */
548int fr_scanlist(pass, ip, fin, m)
549u_32_t pass;
550ip_t *ip;
551register fr_info_t *fin;
552void *m;
553{
554 register struct frentry *fr;
555 register fr_ip_t *fi = &fin->fin_fi;
556 int rulen, portcmp = 0, off, skip = 0, logged = 0;
557 u_32_t passt;
558
559 fr = fin->fin_fr;
560 fin->fin_fr = NULL;
561 fin->fin_rule = 0;
562 fin->fin_group = 0;
563 if (fin->fin_v == 4)
564 off = ip->ip_off & IP_OFFMASK;
565 else
566 off = 0;
567 pass |= (fi->fi_fl << 24);
568
569 if ((fi->fi_fl & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
570 portcmp = 1;
571
572 for (rulen = 0; fr; fr = fr->fr_next, rulen++) {
573 if (skip) {
574 skip--;
575 continue;
576 }
577 /*
578 * In all checks below, a null (zero) value in the
579 * filter struture is taken to mean a wildcard.
580 *
581 * check that we are working for the right interface
582 */
583#ifdef _KERNEL
584# if BSD >= 199306
585 if (fin->fin_out != 0) {
586 if ((fr->fr_oifa &&
587 fr->fr_oifa != ((mb_t *)m)->m_pkthdr.rcvif) ||
588 (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp))
589 continue;
590 } else
591# endif
592 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
593 continue;
594#else
595 if (opts & (OPT_VERBOSE|OPT_DEBUG))
596 printf("\n");
597 FR_VERBOSE(("%c", (pass & FR_PASS) ? 'p' :
598 (pass & FR_AUTH) ? 'a' : 'b'));
599 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
600 continue;
601 FR_VERBOSE((":i"));
602#endif
603 {
604 register u_32_t *ld, *lm, *lip;
605 register int i;
606
607 lip = (u_32_t *)fi;
608 lm = (u_32_t *)&fr->fr_mip;
609 ld = (u_32_t *)&fr->fr_ip;
610 i = ((*lip & *lm) != *ld);
611 FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
612 *lip, *lm, *ld));
613 if (i)
614 continue;
615 /*
616 * We now know whether the packet version and the
617 * rule version match, along with protocol, ttl and
618 * tos.
619 */
620 lip++, lm++, ld++;
621 /*
622 * Unrolled loops (4 each, for 32 bits).
623 */
624 i |= ((*lip & *lm) != *ld) << 19;
625 FR_DEBUG(("1a. %#08x & %#08x != %#08x\n",
626 *lip, *lm, *ld));
627 if (fi->fi_v == 6) {
628 lip++, lm++, ld++;
629 i |= ((*lip & *lm) != *ld) << 19;
630 FR_DEBUG(("1b. %#08x & %#08x != %#08x\n",
631 *lip, *lm, *ld));
632 lip++, lm++, ld++;
633 i |= ((*lip & *lm) != *ld) << 19;
634 FR_DEBUG(("1c. %#08x & %#08x != %#08x\n",
635 *lip, *lm, *ld));
636 lip++, lm++, ld++;
637 i |= ((*lip & *lm) != *ld) << 19;
638 FR_DEBUG(("1d. %#08x & %#08x != %#08x\n",
639 *lip, *lm, *ld));
640 } else {
641 lip += 3;
642 lm += 3;
643 ld += 3;
644 }
645 i ^= (fr->fr_flags & FR_NOTSRCIP);
646 if (i)
647 continue;
648 lip++, lm++, ld++;
649 i |= ((*lip & *lm) != *ld) << 20;
650 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
651 *lip, *lm, *ld));
652 if (fi->fi_v == 6) {
653 lip++, lm++, ld++;
654 i |= ((*lip & *lm) != *ld) << 20;
655 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
656 *lip, *lm, *ld));
657 lip++, lm++, ld++;
658 i |= ((*lip & *lm) != *ld) << 20;
659 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
660 *lip, *lm, *ld));
661 lip++, lm++, ld++;
662 i |= ((*lip & *lm) != *ld) << 20;
663 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
664 *lip, *lm, *ld));
665 } else {
666 lip += 3;
667 lm += 3;
668 ld += 3;
669 }
670 i ^= (fr->fr_flags & FR_NOTDSTIP);
671 if (i)
672 continue;
673 lip++, lm++, ld++;
674 i |= ((*lip & *lm) != *ld);
675 FR_DEBUG(("3. %#08x & %#08x != %#08x\n",
676 *lip, *lm, *ld));
677 lip++, lm++, ld++;
678 i |= ((*lip & *lm) != *ld);
679 FR_DEBUG(("4. %#08x & %#08x != %#08x\n",
680 *lip, *lm, *ld));
681 if (i)
682 continue;
683 }
684
685 /*
686 * If a fragment, then only the first has what we're looking
687 * for here...
688 */
689 if (!portcmp && (fr->fr_dcmp || fr->fr_scmp || fr->fr_tcpf ||
690 fr->fr_tcpfm))
691 continue;
692 if (fi->fi_fl & FI_TCPUDP) {
693 if (!fr_tcpudpchk(&fr->fr_tuc, fin))
694 continue;
695 } else if (fr->fr_icmpm || fr->fr_icmp) {
696 if ((fi->fi_p != IPPROTO_ICMP) || off ||
697 (fin->fin_dlen < 2))
698 continue;
699 if ((fin->fin_data[0] & fr->fr_icmpm) != fr->fr_icmp) {
700 FR_DEBUG(("i. %#x & %#x != %#x\n",
701 fin->fin_data[0], fr->fr_icmpm,
702 fr->fr_icmp));
703 continue;
704 }
705 }
706 FR_VERBOSE(("*"));
707 /*
708 * Just log this packet...
709 */
710 passt = fr->fr_flags;
711#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
712 if (securelevel <= 0)
713#endif
714 if ((passt & FR_CALLNOW) && fr->fr_func)
715 passt = (*fr->fr_func)(passt, ip, fin);
716 fin->fin_fr = fr;
717#ifdef IPFILTER_LOG
718 if ((passt & FR_LOGMASK) == FR_LOG) {
719 if (!IPLLOG(passt, ip, fin, m)) {
720 if (passt & FR_LOGORBLOCK)
721 passt |= FR_BLOCK|FR_QUICK;
722 ATOMIC_INCL(frstats[fin->fin_out].fr_skip);
723 }
724 ATOMIC_INCL(frstats[fin->fin_out].fr_pkl);
725 logged = 1;
726 }
727#endif /* IPFILTER_LOG */
728 if (!(skip = fr->fr_skip) && (passt & FR_LOGMASK) != FR_LOG)
729 pass = passt;
730 FR_DEBUG(("pass %#x\n", pass));
731 ATOMIC_INCL(fr->fr_hits);
732 if (pass & FR_ACCOUNT)
733 fr->fr_bytes += (U_QUAD_T)ip->ip_len;
734 else
735 fin->fin_icode = fr->fr_icode;
736 fin->fin_rule = rulen;
737 fin->fin_group = fr->fr_group;
738 if (fr->fr_grp) {
739 fin->fin_fr = fr->fr_grp;
740 pass = fr_scanlist(pass, ip, fin, m);
741 if (fin->fin_fr == NULL) {
742 fin->fin_rule = rulen;
743 fin->fin_group = fr->fr_group;
744 fin->fin_fr = fr;
745 }
746 if (pass & FR_DONTCACHE)
747 logged = 1;
748 }
749 if (pass & FR_QUICK)
750 break;
751 }
752 if (logged)
753 pass |= FR_DONTCACHE;
754 return pass;
755}
756
757
758/*
759 * frcheck - filter check
760 * check using source and destination addresses/ports in a packet whether
761 * or not to pass it on or not.
762 */
763int fr_check(ip, hlen, ifp, out
764#if defined(_KERNEL) && SOLARIS
765, qif, mp)
766qif_t *qif;
767#else
768, mp)
769#endif
770mb_t **mp;
771ip_t *ip;
772int hlen;
773void *ifp;
774int out;
775{
776 /*
777 * The above really sucks, but short of writing a diff
778 */
779 fr_info_t frinfo, *fc;
780 register fr_info_t *fin = &frinfo;
781 int changed, error = EHOSTUNREACH, v = ip->ip_v;
782 frentry_t *fr = NULL, *list;
783 u_32_t pass, apass;
784#if !SOLARIS || !defined(_KERNEL)
785 register mb_t *m = *mp;
786#endif
787
788#ifdef _KERNEL
789 int p, len, drop = 0, logit = 0;
790 mb_t *mc = NULL;
791# if !defined(__SVR4) && !defined(__svr4__)
792# ifdef __sgi
793 char hbuf[(0xf << 2) + sizeof(struct icmp) + sizeof(ip_t) + 8];
794# endif
795 int up;
796
797# ifdef M_CANFASTFWD
798 /*
799 * XXX For now, IP Filter and fast-forwarding of cached flows
800 * XXX are mutually exclusive. Eventually, IP Filter should
801 * XXX get a "can-fast-forward" filter rule.
802 */
803 m->m_flags &= ~M_CANFASTFWD;
804# endif /* M_CANFASTFWD */
805# ifdef CSUM_DELAY_DATA
806 /*
807 * disable delayed checksums.
808 */
809 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
810 in_delayed_cksum(m);
811 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
812 }
813# endif /* CSUM_DELAY_DATA */
814
815# ifdef USE_INET6
816 if (v == 6) {
817 len = ntohs(((ip6_t*)ip)->ip6_plen);
818 p = ((ip6_t *)ip)->ip6_nxt;
819 } else
820# endif
821 {
822 p = ip->ip_p;
823 len = ip->ip_len;
824 }
825
826 if ((p == IPPROTO_TCP || p == IPPROTO_UDP || p == IPPROTO_ICMP
827# ifdef USE_INET6
828 || (v == 6 && p == IPPROTO_ICMPV6)
829# endif
830 )) {
831 int plen = 0;
832
833 if ((v == 6) || (ip->ip_off & IP_OFFMASK) == 0)
834 switch(p)
835 {
836 case IPPROTO_TCP:
837 plen = sizeof(tcphdr_t);
838 break;
839 case IPPROTO_UDP:
840 plen = sizeof(udphdr_t);
841 break;
842 /* 96 - enough for complete ICMP error IP header */
843 case IPPROTO_ICMP:
844 plen = ICMPERR_MAXPKTLEN - sizeof(ip_t);
845 break;
846# ifdef USE_INET6
847 case IPPROTO_ICMPV6 :
848 /*
849 * XXX does not take intermediate header
850 * into account
851 */
852 plen = ICMP6ERR_MINPKTLEN + 8 - sizeof(ip6_t);
853 break;
854# endif
855 }
856 up = MIN(hlen + plen, len);
857
858 if (up > m->m_len) {
859# ifdef __sgi
860 /* Under IRIX, avoid m_pullup as it makes ping <hostname> panic */
861 if ((up > sizeof(hbuf)) || (m_length(m) < up)) {
862 ATOMIC_INCL(frstats[out].fr_pull[1]);
863 return -1;
864 }
865 m_copydata(m, 0, up, hbuf);
866 ATOMIC_INCL(frstats[out].fr_pull[0]);
867 ip = (ip_t *)hbuf;
868# else /* __ sgi */
869# ifndef linux
870 if ((*mp = m_pullup(m, up)) == 0) {
871 ATOMIC_INCL(frstats[out].fr_pull[1]);
872 return -1;
873 } else {
874 ATOMIC_INCL(frstats[out].fr_pull[0]);
875 m = *mp;
876 ip = mtod(m, ip_t *);
877 }
878# endif /* !linux */
879# endif /* __sgi */
880 } else
881 up = 0;
882 } else
883 up = 0;
884# endif /* !defined(__SVR4) && !defined(__svr4__) */
885# if SOLARIS
886 mb_t *m = qif->qf_m;
887
888 if ((u_int)ip & 0x3)
889 return 2;
890 fin->fin_qfm = m;
891 fin->fin_qif = qif;
892# endif
893#endif /* _KERNEL */
894
895#ifndef __FreeBSD__
896 /*
897 * Be careful here: ip_id is in network byte order when called
898 * from ip_output()
899 */
900 if ((out) && (v == 4))
901 ip->ip_id = ntohs(ip->ip_id);
902#endif
903
904 changed = 0;
905 fin->fin_ifp = ifp;
906 fin->fin_v = v;
907 fin->fin_out = out;
908 fin->fin_mp = mp;
909 fr_makefrip(hlen, ip, fin);
910
911#ifdef _KERNEL
912# ifdef USE_INET6
913 if (v == 6) {
914 ATOMIC_INCL(frstats[0].fr_ipv6[out]);
915 if (((ip6_t *)ip)->ip6_hlim < fr_minttl) {
916 ATOMIC_INCL(frstats[0].fr_badttl);
917 if (fr_minttllog)
918 logit = -2;
919 }
920 } else
921# endif
922 if (!out) {
923 if (fr_chksrc && !fr_verifysrc(ip->ip_src, ifp)) {
924 ATOMIC_INCL(frstats[0].fr_badsrc);
925 if (fr_chksrc == 2)
926 logit = -2;
927 } else if (ip->ip_ttl < fr_minttl) {
928 ATOMIC_INCL(frstats[0].fr_badttl);
929 if (fr_minttllog)
930 logit = -3;
931 }
932 }
933 if (drop) {
934# ifdef IPFILTER_LOG
935 if (logit) {
936 fin->fin_group = logit;
937 pass = FR_INQUE|FR_NOMATCH|FR_LOGB;
938 (void) IPLLOG(pass, ip, fin, m);
939 }
940# endif
941# if !SOLARIS
942 m_freem(m);
943# endif
944 return error;
945 }
946#endif
947 pass = fr_pass;
948 if (fin->fin_fi.fi_fl & FI_SHORT) {
949 ATOMIC_INCL(frstats[out].fr_short);
950 }
951
952 READ_ENTER(&ipf_mutex);
953
954 if (fin->fin_fi.fi_fl & FI_SHORT)
955 ATOMIC_INCL(frstats[out].fr_short);
956
957 /*
958 * Check auth now. This, combined with the check below to see if apass
959 * is 0 is to ensure that we don't count the packet twice, which can
960 * otherwise occur when we reprocess it. As it is, we only count it
961 * after it has no auth. table matchup. This also stops NAT from
962 * occuring until after the packet has been auth'd.
963 */
964 apass = fr_checkauth(ip, fin);
965
966 if (!out) {
967#ifdef USE_INET6
968 if (v == 6)
969 list = ipacct6[0][fr_active];
970 else
971#endif
972 list = ipacct[0][fr_active];
973 changed = ip_natin(ip, fin);
974 if (!apass && (fin->fin_fr = list) &&
975 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
976 ATOMIC_INCL(frstats[0].fr_acct);
977 }
978 }
979
980 if (apass || (!(fr = ipfr_knownfrag(ip, fin)) &&
981 !(fr = fr_checkstate(ip, fin)))) {
982 /*
983 * If a packet is found in the auth table, then skip checking
984 * the access lists for permission but we do need to consider
985 * the result as if it were from the ACL's.
986 */
987 if (!apass) {
988 fc = frcache + out;
989 if (!bcmp((char *)fin, (char *)fc, FI_CSIZE)) {
990 /*
991 * copy cached data so we can unlock the mutex
992 * earlier.
993 */
994 bcopy((char *)fc, (char *)fin, FI_COPYSIZE);
995 ATOMIC_INCL(frstats[out].fr_chit);
996 if ((fr = fin->fin_fr)) {
997 ATOMIC_INCL(fr->fr_hits);
998 pass = fr->fr_flags;
999 }
1000 } else {
1001#ifdef USE_INET6
1002 if (v == 6)
1003 list = ipfilter6[out][fr_active];
1004 else
1005#endif
1006 list = ipfilter[out][fr_active];
1007 if ((fin->fin_fr = list))
1008 pass = fr_scanlist(fr_pass, ip, fin, m);
1009 if (!(pass & (FR_KEEPSTATE|FR_DONTCACHE)))
1010 bcopy((char *)fin, (char *)fc,
1011 FI_COPYSIZE);
1012 if (pass & FR_NOMATCH) {
1013 ATOMIC_INCL(frstats[out].fr_nom);
1014 }
1015 }
1016 fr = fin->fin_fr;
1017 } else
1018 pass = apass;
1019
1020 /*
1021 * If we fail to add a packet to the authorization queue,
1022 * then we drop the packet later. However, if it was added
1023 * then pretend we've dropped it already.
1024 */
1025 if ((pass & FR_AUTH))
1026 if (fr_newauth((mb_t *)m, fin, ip) != 0)
1027#ifdef _KERNEL
1028 m = *mp = NULL;
1029#else
1030 ;
1031#endif
1032
1033 if (pass & FR_PREAUTH) {
1034 READ_ENTER(&ipf_auth);
1035 if ((fin->fin_fr = ipauth) &&
1036 (pass = fr_scanlist(0, ip, fin, m))) {
1037 ATOMIC_INCL(fr_authstats.fas_hits);
1038 } else {
1039 ATOMIC_INCL(fr_authstats.fas_miss);
1040 }
1041 RWLOCK_EXIT(&ipf_auth);
1042 }
1043
1044 fin->fin_fr = fr;
1045 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
1046 if (fin->fin_fi.fi_fl & FI_FRAG) {
1047 if (ipfr_newfrag(ip, fin, pass) == -1) {
1048 ATOMIC_INCL(frstats[out].fr_bnfr);
1049 } else {
1050 ATOMIC_INCL(frstats[out].fr_nfr);
1051 }
1052 } else {
1053 ATOMIC_INCL(frstats[out].fr_cfr);
1054 }
1055 }
1056 if (pass & FR_KEEPSTATE) {
1057 if (fr_addstate(ip, fin, 0) == NULL) {
1058 ATOMIC_INCL(frstats[out].fr_bads);
1059 } else {
1060 ATOMIC_INCL(frstats[out].fr_ads);
1061 }
1062 }
1063 } else if (fr != NULL) {
1064 pass = fr->fr_flags;
1065 if (pass & FR_LOGFIRST)
1066 pass &= ~(FR_LOGFIRST|FR_LOG);
1067 }
1068
1069#if (BSD >= 199306) && (defined(_KERNEL) || defined(KERNEL))
1070 if (securelevel <= 0)
1071#endif
1072 if (fr && fr->fr_func && !(pass & FR_CALLNOW))
1073 pass = (*fr->fr_func)(pass, ip, fin);
1074
1075 /*
1076 * Only count/translate packets which will be passed on, out the
1077 * interface.
1078 */
1079 if (out && (pass & FR_PASS)) {
1080#ifdef USE_INET6
1081 if (v == 6)
1082 list = ipacct6[1][fr_active];
1083 else
1084#endif
1085 list = ipacct[1][fr_active];
1086 if ((fin->fin_fr = list) &&
1087 (fr_scanlist(FR_NOMATCH, ip, fin, m) & FR_ACCOUNT)) {
1088 ATOMIC_INCL(frstats[1].fr_acct);
1089 }
1090 fin->fin_fr = fr;
1091 changed = ip_natout(ip, fin);
1092 } else
1093 fin->fin_fr = fr;
1094 RWLOCK_EXIT(&ipf_mutex);
1095
1096#ifdef IPFILTER_LOG
1097 if ((fr_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
1098 if ((fr_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
1099 pass |= FF_LOGNOMATCH;
1100 ATOMIC_INCL(frstats[out].fr_npkl);
1101 goto logit;
1102 } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
1103 ((pass & FR_PASS) && (fr_flags & FF_LOGPASS))) {
1104 if ((pass & FR_LOGMASK) != FR_LOGP)
1105 pass |= FF_LOGPASS;
1106 ATOMIC_INCL(frstats[out].fr_ppkl);
1107 goto logit;
1108 } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
1109 ((pass & FR_BLOCK) && (fr_flags & FF_LOGBLOCK))) {
1110 if ((pass & FR_LOGMASK) != FR_LOGB)
1111 pass |= FF_LOGBLOCK;
1112 ATOMIC_INCL(frstats[out].fr_bpkl);
1113logit:
1114 if (!IPLLOG(pass, ip, fin, m)) {
1115 ATOMIC_INCL(frstats[out].fr_skip);
1116 if ((pass & (FR_PASS|FR_LOGORBLOCK)) ==
1117 (FR_PASS|FR_LOGORBLOCK))
1118 pass ^= FR_PASS|FR_BLOCK;
1119 }
1120 }
1121 }
1122#endif /* IPFILTER_LOG */
1123
1124#ifndef __FreeBSD__
1125 if ((out) && (v == 4))
1126 ip->ip_id = htons(ip->ip_id);
1127#endif
1128
1129#ifdef _KERNEL
1130 /*
1131 * Only allow FR_DUP to work if a rule matched - it makes no sense to
1132 * set FR_DUP as a "default" as there are no instructions about where
1133 * to send the packet.
1134 */
1135 if (fr && (pass & FR_DUP))
1136# if SOLARIS
1137 mc = dupmsg(m);
1138# else
1139# ifndef linux
1140 mc = m_copy(m, 0, M_COPYALL);
1141# else
1142 ;
1143# endif
1144# endif
1145#endif
1146 if (pass & FR_PASS) {
1147 ATOMIC_INCL(frstats[out].fr_pass);
1148 } else if (pass & FR_BLOCK) {
1149 ATOMIC_INCL(frstats[out].fr_block);
1150 /*
1151 * Should we return an ICMP packet to indicate error
1152 * status passing through the packet filter ?
1153 * WARNING: ICMP error packets AND TCP RST packets should
1154 * ONLY be sent in repsonse to incoming packets. Sending them
1155 * in response to outbound packets can result in a panic on
1156 * some operating systems.
1157 */
1158 if (!out) {
1159#ifdef _KERNEL
1160 if (pass & FR_RETICMP) {
1161 int dst;
1162
1163 if ((pass & FR_RETMASK) == FR_FAKEICMP)
1164 dst = 1;
1165 else
1166 dst = 0;
1167 send_icmp_err(ip, ICMP_UNREACH, fin, dst);
1168 ATOMIC_INCL(frstats[0].fr_ret);
1169 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1170 !(fin->fin_fi.fi_fl & FI_SHORT)) {
1171 if (send_reset(ip, fin) == 0) {
1172 ATOMIC_INCL(frstats[1].fr_ret);
1173 }
1174 }
1175#else
1176 if ((pass & FR_RETMASK) == FR_RETICMP) {
1177 verbose("- ICMP unreachable sent\n");
1178 ATOMIC_INCL(frstats[0].fr_ret);
1179 } else if ((pass & FR_RETMASK) == FR_FAKEICMP) {
1180 verbose("- forged ICMP unreachable sent\n");
1181 ATOMIC_INCL(frstats[0].fr_ret);
1182 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
1183 !(fin->fin_fi.fi_fl & FI_SHORT)) {
1184 verbose("- TCP RST sent\n");
1185 ATOMIC_INCL(frstats[1].fr_ret);
1186 }
1187#endif
1188 } else {
1189 if (pass & FR_RETRST)
1190 error = ECONNRESET;
1191 }
1192 }
1193
1194 /*
1195 * If we didn't drop off the bottom of the list of rules (and thus
1196 * the 'current' rule fr is not NULL), then we may have some extra
1197 * instructions about what to do with a packet.
1198 * Once we're finished return to our caller, freeing the packet if
1199 * we are dropping it (* BSD ONLY *).
1200 */
1201 if ((changed == -1) && (pass & FR_PASS)) {
1202 pass &= ~FR_PASS;
1203 pass |= FR_BLOCK;
1204 }
1205#if defined(_KERNEL)
1206# if !SOLARIS
1207# if !defined(linux)
1208 if (fr) {
1209 frdest_t *fdp = &fr->fr_tif;
1210
1211 if (((pass & FR_FASTROUTE) && !out) ||
1212 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1213 if (ipfr_fastroute(m, fin, fdp) == 0)
1214 m = *mp = NULL;
1215 }
1216 if (mc)
1217 ipfr_fastroute(mc, fin, &fr->fr_dif);
1218 }
1219 if (!(pass & FR_PASS) && m)
1220 m_freem(m);
1221# ifdef __sgi
1222 else if (changed && up && m)
1223 m_copyback(m, 0, up, hbuf);
1224# endif
1225# endif /* !linux */
1226# else /* !SOLARIS */
1227 if (fr) {
1228 frdest_t *fdp = &fr->fr_tif;
1229
1230 if (((pass & FR_FASTROUTE) && !out) ||
1231 (fdp->fd_ifp && fdp->fd_ifp != (struct ifnet *)-1)) {
1232 if (ipfr_fastroute(ip, m, mp, fin, fdp) == 0)
1233 m = *mp = NULL;
1234 }
1235 if (mc)
1236 ipfr_fastroute(ip, mc, mp, fin, &fr->fr_dif);
1237 }
1238# endif /* !SOLARIS */
1239 return (pass & FR_PASS) ? 0 : error;
1240#else /* _KERNEL */
1241 if (pass & FR_NOMATCH)
1242 return 1;
1243 if (pass & FR_PASS)
1244 return 0;
1245 if (pass & FR_AUTH)
1246 return -2;
1247 return -1;
1248#endif /* _KERNEL */
1249}
1250
1251
1252/*
1253 * ipf_cksum
1254 * addr should be 16bit aligned and len is in bytes.
1255 * length is in bytes
1256 */
1257u_short ipf_cksum(addr, len)
1258register u_short *addr;
1259register int len;
1260{
1261 register u_32_t sum = 0;
1262
1263 for (sum = 0; len > 1; len -= 2)
1264 sum += *addr++;
1265
1266 /* mop up an odd byte, if necessary */
1267 if (len == 1)
1268 sum += *(u_char *)addr;
1269
1270 /*
1271 * add back carry outs from top 16 bits to low 16 bits
1272 */
1273 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
1274 sum += (sum >> 16); /* add carry */
1275 return (u_short)(~sum);
1276}
1277
1278
1279/*
1280 * NB: This function assumes we've pullup'd enough for all of the IP header
1281 * and the TCP header. We also assume that data blocks aren't allocated in
1282 * odd sizes.
1283 */
1284u_short fr_tcpsum(m, ip, tcp)
1285mb_t *m;
1286ip_t *ip;
1287tcphdr_t *tcp;
1288{
1289 u_short *sp, slen, ts;
1290 u_int sum, sum2;
1291 int hlen;
1292
1293 /*
1294 * Add up IP Header portion
1295 */
1296 hlen = ip->ip_hl << 2;
1297 slen = ip->ip_len - hlen;
1298 sum = htons((u_short)ip->ip_p);
1299 sum += htons(slen);
1300 sp = (u_short *)&ip->ip_src;
1301 sum += *sp++; /* ip_src */
1302 sum += *sp++;
1303 sum += *sp++; /* ip_dst */
1304 sum += *sp++;
1305 ts = tcp->th_sum;
1306 tcp->th_sum = 0;
1307#ifdef KERNEL
1308# if SOLARIS
1309 sum2 = ip_cksum(m, hlen, sum); /* hlen == offset */
1310 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1311 sum2 = ~sum2 & 0xffff;
1312# else /* SOLARIS */
1313# if defined(BSD) || defined(sun)
1314# if BSD >= 199306
1315 m->m_data += hlen;
1316# else
1317 m->m_off += hlen;
1318# endif
1319 m->m_len -= hlen;
1320 sum2 = in_cksum(m, slen);
1321 m->m_len += hlen;
1322# if BSD >= 199306
1323 m->m_data -= hlen;
1324# else
1325 m->m_off -= hlen;
1326# endif
1327 /*
1328 * Both sum and sum2 are partial sums, so combine them together.
1329 */
1330 sum = (sum & 0xffff) + (sum >> 16);
1331 sum = ~sum & 0xffff;
1332 sum2 += sum;
1333 sum2 = (sum2 & 0xffff) + (sum2 >> 16);
1334# else /* defined(BSD) || defined(sun) */
1335{
1336 union {
1337 u_char c[2];
1338 u_short s;
1339 } bytes;
1340 u_short len = ip->ip_len;
1341# if defined(__sgi)
1342 int add;
1343# endif
1344
1345 /*
1346 * Add up IP Header portion
1347 */
1348 sp = (u_short *)&ip->ip_src;
1349 len -= (ip->ip_hl << 2);
1350 sum = ntohs(IPPROTO_TCP);
1351 sum += htons(len);
1352 sum += *sp++; /* ip_src */
1353 sum += *sp++;
1354 sum += *sp++; /* ip_dst */
1355 sum += *sp++;
1356 if (sp != (u_short *)tcp)
1357 sp = (u_short *)tcp;
1358 sum += *sp++; /* sport */
1359 sum += *sp++; /* dport */
1360 sum += *sp++; /* seq */
1361 sum += *sp++;
1362 sum += *sp++; /* ack */
1363 sum += *sp++;
1364 sum += *sp++; /* off */
1365 sum += *sp++; /* win */
1366 sum += *sp++; /* Skip over checksum */
1367 sum += *sp++; /* urp */
1368
1369# ifdef __sgi
1370 /*
1371 * In case we had to copy the IP & TCP header out of mbufs,
1372 * skip over the mbuf bits which are the header
1373 */
1374 if ((caddr_t)ip != mtod(m, caddr_t)) {
1375 hlen = (caddr_t)sp - (caddr_t)ip;
1376 while (hlen) {
1377 add = MIN(hlen, m->m_len);
1378 sp = (u_short *)(mtod(m, caddr_t) + add);
1379 hlen -= add;
1380 if (add == m->m_len) {
1381 m = m->m_next;
1382 if (!hlen) {
1383 if (!m)
1384 break;
1385 sp = mtod(m, u_short *);
1386 }
1387 PANIC((!m),("fr_tcpsum(1): not enough data"));
1388 }
1389 }
1390 }
1391# endif
1392
1393 if (!(len -= sizeof(*tcp)))
1394 goto nodata;
1395 while (len > 1) {
1396 if (((caddr_t)sp - mtod(m, caddr_t)) >= m->m_len) {
1397 m = m->m_next;
1398 PANIC((!m),("fr_tcpsum(2): not enough data"));
1399 sp = mtod(m, u_short *);
1400 }
1401 if (((caddr_t)(sp + 1) - mtod(m, caddr_t)) > m->m_len) {
1402 bytes.c[0] = *(u_char *)sp;
1403 m = m->m_next;
1404 PANIC((!m),("fr_tcpsum(3): not enough data"));
1405 sp = mtod(m, u_short *);
1406 bytes.c[1] = *(u_char *)sp;
1407 sum += bytes.s;
1408 sp = (u_short *)((u_char *)sp + 1);
1409 }
1410 if ((u_long)sp & 1) {
1411 bcopy((char *)sp++, (char *)&bytes.s, sizeof(bytes.s));
1412 sum += bytes.s;
1413 } else
1414 sum += *sp++;
1415 len -= 2;
1416 }
1417 if (len)
1418 sum += ntohs(*(u_char *)sp << 8);
1419nodata:
1420 while (sum > 0xffff)
1421 sum = (sum & 0xffff) + (sum >> 16);
1422 sum2 = (u_short)(~sum & 0xffff);
1423}
1424# endif /* defined(BSD) || defined(sun) */
1425# endif /* SOLARIS */
1426#else /* KERNEL */
1427 sum2 = 0;
1428#endif /* KERNEL */
1429 tcp->th_sum = ts;
1430 return sum2;
1431}
1432
1433
1434#if defined(_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || defined(__sgi) )
1435/*
1436 * Copyright (c) 1982, 1986, 1988, 1991, 1993
1437 * The Regents of the University of California. All rights reserved.
1438 *
1439 * Redistribution and use in source and binary forms, with or without
1440 * modification, are permitted provided that the following conditions
1441 * are met:
1442 * 1. Redistributions of source code must retain the above copyright
1443 * notice, this list of conditions and the following disclaimer.
1444 * 2. Redistributions in binary form must reproduce the above copyright
1445 * notice, this list of conditions and the following disclaimer in the
1446 * documentation and/or other materials provided with the distribution.
1447 * 3. All advertising materials mentioning features or use of this software
1448 * must display the following acknowledgement:
1449 * This product includes software developed by the University of
1450 * California, Berkeley and its contributors.
1451 * 4. Neither the name of the University nor the names of its contributors
1452 * may be used to endorse or promote products derived from this software
1453 * without specific prior written permission.
1454 *
1455 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1456 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1457 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1458 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1459 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1460 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1461 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1462 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1463 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1464 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1465 * SUCH DAMAGE.
1466 *
1467 * @(#)uipc_mbuf.c 8.2 (Berkeley) 1/4/94
1468 * $Id: fil.c,v 2.35.2.30 2000/12/17 05:49:22 darrenr Exp $
1469 */
1470/*
1471 * Copy data from an mbuf chain starting "off" bytes from the beginning,
1472 * continuing for "len" bytes, into the indicated buffer.
1473 */
1474void
1475m_copydata(m, off, len, cp)
1476 register mb_t *m;
1477 register int off;
1478 register int len;
1479 caddr_t cp;
1480{
1481 register unsigned count;
1482
1483 if (off < 0 || len < 0)
1484 panic("m_copydata");
1485 while (off > 0) {
1486 if (m == 0)
1487 panic("m_copydata");
1488 if (off < m->m_len)
1489 break;
1490 off -= m->m_len;
1491 m = m->m_next;
1492 }
1493 while (len > 0) {
1494 if (m == 0)
1495 panic("m_copydata");
1496 count = MIN(m->m_len - off, len);
1497 bcopy(mtod(m, caddr_t) + off, cp, count);
1498 len -= count;
1499 cp += count;
1500 off = 0;
1501 m = m->m_next;
1502 }
1503}
1504
1505
1506# ifndef linux
1507/*
1508 * Copy data from a buffer back into the indicated mbuf chain,
1509 * starting "off" bytes from the beginning, extending the mbuf
1510 * chain if necessary.
1511 */
1512void
1513m_copyback(m0, off, len, cp)
1514 struct mbuf *m0;
1515 register int off;
1516 register int len;
1517 caddr_t cp;
1518{
1519 register int mlen;
1520 register struct mbuf *m = m0, *n;
1521 int totlen = 0;
1522
1523 if (m0 == 0)
1524 return;
1525 while (off > (mlen = m->m_len)) {
1526 off -= mlen;
1527 totlen += mlen;
1528 if (m->m_next == 0) {
1529 n = m_getclr(M_DONTWAIT, m->m_type);
1530 if (n == 0)
1531 goto out;
1532 n->m_len = min(MLEN, len + off);
1533 m->m_next = n;
1534 }
1535 m = m->m_next;
1536 }
1537 while (len > 0) {
1538 mlen = min (m->m_len - off, len);
1539 bcopy(cp, off + mtod(m, caddr_t), (unsigned)mlen);
1540 cp += mlen;
1541 len -= mlen;
1542 mlen += off;
1543 off = 0;
1544 totlen += mlen;
1545 if (len == 0)
1546 break;
1547 if (m->m_next == 0) {
1548 n = m_get(M_DONTWAIT, m->m_type);
1549 if (n == 0)
1550 break;
1551 n->m_len = min(MLEN, len);
1552 m->m_next = n;
1553 }
1554 m = m->m_next;
1555 }
1556out:
1557#if 0
1558 if (((m = m0)->m_flags & M_PKTHDR) && (m->m_pkthdr.len < totlen))
1559 m->m_pkthdr.len = totlen;
1560#endif
1561 return;
1562}
1563# endif /* linux */
1564#endif /* (_KERNEL) && ( ((BSD < 199306) && !SOLARIS) || __sgi) */
1565
1566
1567frgroup_t *fr_findgroup(num, flags, which, set, fgpp)
1568u_32_t num, flags;
1569minor_t which;
1570int set;
1571frgroup_t ***fgpp;
1572{
1573 frgroup_t *fg, **fgp;
1574
1575 if (which == IPL_LOGAUTH)
1576 fgp = &ipfgroups[2][set];
1577 else if (flags & FR_ACCOUNT)
1578 fgp = &ipfgroups[1][set];
1579 else if (flags & (FR_OUTQUE|FR_INQUE))
1580 fgp = &ipfgroups[0][set];
1581 else
1582 return NULL;
1583 num &= 0xffff;
1584
1585 while ((fg = *fgp))
1586 if (fg->fg_num == num)
1587 break;
1588 else
1589 fgp = &fg->fg_next;
1590 if (fgpp)
1591 *fgpp = fgp;
1592 return fg;
1593}
1594
1595
1596frgroup_t *fr_addgroup(num, fp, which, set)
1597u_32_t num;
1598frentry_t *fp;
1599minor_t which;
1600int set;
1601{
1602 frgroup_t *fg, **fgp;
1603
1604 if ((fg = fr_findgroup(num, fp->fr_flags, which, set, &fgp)))
1605 return fg;
1606
1607 KMALLOC(fg, frgroup_t *);
1608 if (fg) {
1609 fg->fg_num = num;
1610 fg->fg_next = *fgp;
1611 fg->fg_head = fp;
1612 fg->fg_start = &fp->fr_grp;
1613 *fgp = fg;
1614 }
1615 return fg;
1616}
1617
1618
1619void fr_delgroup(num, flags, which, set)
1620u_32_t num, flags;
1621minor_t which;
1622int set;
1623{
1624 frgroup_t *fg, **fgp;
1625
1626 if (!(fg = fr_findgroup(num, flags, which, set, &fgp)))
1627 return;
1628
1629 *fgp = fg->fg_next;
1630 KFREE(fg);
1631}
1632
1633
1634
1635/*
1636 * recursively flush rules from the list, descending groups as they are
1637 * encountered. if a rule is the head of a group and it has lost all its
1638 * group members, then also delete the group reference.
1639 */
1640static int frflushlist(set, unit, nfreedp, listp)
1641int set;
1642minor_t unit;
1643int *nfreedp;
1644frentry_t **listp;
1645{
1646 register int freed = 0, i;
1647 register frentry_t *fp;
1648
1649 while ((fp = *listp)) {
1650 *listp = fp->fr_next;
1651 if (fp->fr_grp) {
1652 i = frflushlist(set, unit, nfreedp, &fp->fr_grp);
1653 MUTEX_ENTER(&ipf_rw);
1654 fp->fr_ref -= i;
1655 MUTEX_EXIT(&ipf_rw);
1656 }
1657
1658 ATOMIC_DEC32(fp->fr_ref);
1659 if (fp->fr_grhead) {
1660 fr_delgroup(fp->fr_grhead, fp->fr_flags,
1661 unit, set);
1662 fp->fr_grhead = 0;
1663 }
1664 if (fp->fr_ref == 0) {
1665 KFREE(fp);
1666 freed++;
1667 } else
1668 fp->fr_next = NULL;
1669 }
1670 *nfreedp += freed;
1671 return freed;
1672}
1673
1674
1675int frflush(unit, flags)
1676minor_t unit;
1677int flags;
1678{
1679 int flushed = 0, set;
1680
1681 if (unit != IPL_LOGIPF)
1682 return 0;
1683 WRITE_ENTER(&ipf_mutex);
1684 bzero((char *)frcache, sizeof(frcache[0]) * 2);
1685
1686 set = fr_active;
1687 if (flags & FR_INACTIVE)
1688 set = 1 - set;
1689
1690 if (flags & FR_OUTQUE) {
1691#ifdef USE_INET6
1692 (void) frflushlist(set, unit, &flushed, &ipfilter6[1][set]);
1693 (void) frflushlist(set, unit, &flushed, &ipacct6[1][set]);
1694#endif
1695 (void) frflushlist(set, unit, &flushed, &ipfilter[1][set]);
1696 (void) frflushlist(set, unit, &flushed, &ipacct[1][set]);
1697 }
1698 if (flags & FR_INQUE) {
1699#ifdef USE_INET6
1700 (void) frflushlist(set, unit, &flushed, &ipfilter6[0][set]);
1701 (void) frflushlist(set, unit, &flushed, &ipacct6[0][set]);
1702#endif
1703 (void) frflushlist(set, unit, &flushed, &ipfilter[0][set]);
1704 (void) frflushlist(set, unit, &flushed, &ipacct[0][set]);
1705 }
1706 RWLOCK_EXIT(&ipf_mutex);
1707 return flushed;
1708}
1709
1710
1711char *memstr(src, dst, slen, dlen)
1712char *src, *dst;
1713int slen, dlen;
1714{
1715 char *s = NULL;
1716
1717 while (dlen >= slen) {
1718 if (bcmp(src, dst, slen) == 0) {
1719 s = dst;
1720 break;
1721 }
1722 dst++;
1723 dlen--;
1724 }
1725 return s;
1726}
1727
1728
1729void fixskip(listp, rp, addremove)
1730frentry_t **listp, *rp;
1731int addremove;
1732{
1733 frentry_t *fp;
1734 int rules = 0, rn = 0;
1735
1736 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rules++)
1737 ;
1738
1739 if (!fp)
1740 return;
1741
1742 for (fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
1743 if (fp->fr_skip && (rn + fp->fr_skip >= rules))
1744 fp->fr_skip += addremove;
1745}
1746
1747
1748#ifdef _KERNEL
1749/*
1750 * count consecutive 1's in bit mask. If the mask generated by counting
1751 * consecutive 1's is different to that passed, return -1, else return #
1752 * of bits.
1753 */
1754int countbits(ip)
1755u_32_t ip;
1756{
1757 u_32_t ipn;
1758 int cnt = 0, i, j;
1759
1760 ip = ipn = ntohl(ip);
1761 for (i = 32; i; i--, ipn *= 2)
1762 if (ipn & 0x80000000)
1763 cnt++;
1764 else
1765 break;
1766 ipn = 0;
1767 for (i = 32, j = cnt; i; i--, j--) {
1768 ipn *= 2;
1769 if (j > 0)
1770 ipn++;
1771 }
1772 if (ipn == ip)
1773 return cnt;
1774 return -1;
1775}
1776
1777
1778/*
1779 * return the first IP Address associated with an interface
1780 */
1781int fr_ifpaddr(v, ifptr, inp)
1782int v;
1783void *ifptr;
1784struct in_addr *inp;
1785{
1786# ifdef USE_INET6
1787 struct in6_addr *inp6 = NULL;
1788# endif
1789# if SOLARIS
1790 ill_t *ill = ifptr;
1791# else
1792 struct ifnet *ifp = ifptr;
1793# endif
1794 struct in_addr in;
1795
1796# if SOLARIS
1797# ifdef USE_INET6
1798 if (v == 6) {
1799 struct in6_addr in6;
1800
1801 /*
1802 * First is always link local.
1803 */
1804 if (ill->ill_ipif->ipif_next)
1805 in6 = ill->ill_ipif->ipif_next->ipif_v6lcl_addr;
1806 else
1807 bzero((char *)&in6, sizeof(in6));
1808 bcopy((char *)&in6, (char *)inp, sizeof(in6));
1809 } else
1810# endif
1811 {
1812 in.s_addr = ill->ill_ipif->ipif_local_addr;
1813 *inp = in;
1814 }
1815# else /* SOLARIS */
1816# if linux
1817 ;
1818# else /* linux */
1819 struct sockaddr_in *sin;
1820 struct ifaddr *ifa;
1821
1822# if (__FreeBSD_version >= 300000)
1823 ifa = TAILQ_FIRST(&ifp->if_addrhead);
1824# else
1825# if defined(__NetBSD__) || defined(__OpenBSD__)
1826 ifa = ifp->if_addrlist.tqh_first;
1827# else
1828# if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
1829 ifa = &((struct in_ifaddr *)ifp->in_ifaddr)->ia_ifa;
1830# else
1831 ifa = ifp->if_addrlist;
1832# endif
1833# endif /* __NetBSD__ || __OpenBSD__ */
1834# endif /* __FreeBSD_version >= 300000 */
1835# if (BSD < 199306) && !(/*IRIX6*/defined(__sgi) && defined(IFF_DRVRLOCK))
1836 sin = (struct sockaddr_in *)&ifa->ifa_addr;
1837# else
1838 sin = (struct sockaddr_in *)ifa->ifa_addr;
1839 while (sin && ifa) {
1840 if ((v == 4) && (sin->sin_family == AF_INET))
1841 break;
1842# ifdef USE_INET6
1843 if ((v == 6) && (sin->sin_family == AF_INET6)) {
1844 inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr;
1845 if (!IN6_IS_ADDR_LINKLOCAL(inp6) &&
1846 !IN6_IS_ADDR_LOOPBACK(inp6))
1847 break;
1848 }
1849# endif
1850# if (__FreeBSD_version >= 300000)
1851 ifa = TAILQ_NEXT(ifa, ifa_link);
1852# else
1853# if defined(__NetBSD__) || defined(__OpenBSD__)
1854 ifa = ifa->ifa_list.tqe_next;
1855# else
1856 ifa = ifa->ifa_next;
1857# endif
1858# endif /* __FreeBSD_version >= 300000 */
1859 if (ifa)
1860 sin = (struct sockaddr_in *)ifa->ifa_addr;
1861 }
1862 if (ifa == NULL)
1863 sin = NULL;
1864 if (sin == NULL)
1865 return -1;
1866# endif /* (BSD < 199306) && (!__sgi && IFF_DRVLOCK) */
1867# ifdef USE_INET6
1868 if (v == 6)
1869 bcopy((char *)inp6, (char *)inp, sizeof(*inp6));
1870 else
1871# endif
1872 {
1873 in = sin->sin_addr;
1874 *inp = in;
1875 }
1876# endif /* linux */
1877# endif /* SOLARIS */
1878 return 0;
1879}
1880
1881
1882static void frsynclist(fr)
1883register frentry_t *fr;
1884{
1885 for (; fr; fr = fr->fr_next) {
1886 if (fr->fr_ifa != NULL) {
1887 fr->fr_ifa = GETUNIT(fr->fr_ifname, fr->fr_ip.fi_v);
1888 if (fr->fr_ifa == NULL)
1889 fr->fr_ifa = (void *)-1;
1890 }
1891 if (fr->fr_grp)
1892 frsynclist(fr->fr_grp);
1893 }
1894}
1895
1896
1897void frsync()
1898{
1899# if !SOLARIS
1900 register struct ifnet *ifp;
1901
1902# if defined(__OpenBSD__) || ((NetBSD >= 199511) && (NetBSD < 1991011)) || \
1903 (defined(__FreeBSD_version) && (__FreeBSD_version >= 300000))
1904# if (NetBSD >= 199905) || defined(__OpenBSD__)
1905 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
1906# else
1907 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
1908# endif
1909# else
1910 for (ifp = ifnet; ifp; ifp = ifp->if_next)
1911# endif
1912 {
1913 ip_natsync(ifp);
1914 ip_statesync(ifp);
1915 }
1916 ip_natsync((struct ifnet *)-1);
1917# endif
1918
1919 WRITE_ENTER(&ipf_mutex);
1920 frsynclist(ipacct[0][fr_active]);
1921 frsynclist(ipacct[1][fr_active]);
1922 frsynclist(ipfilter[0][fr_active]);
1923 frsynclist(ipfilter[1][fr_active]);
1924#ifdef USE_INET6
1925 frsynclist(ipacct6[0][fr_active]);
1926 frsynclist(ipacct6[1][fr_active]);
1927 frsynclist(ipfilter6[0][fr_active]);
1928 frsynclist(ipfilter6[1][fr_active]);
1929#endif
1930 RWLOCK_EXIT(&ipf_mutex);
1931}
1932
1933
1934/*
1935 * In the functions below, bcopy() is called because the pointer being
1936 * copied _from_ in this instance is a pointer to a char buf (which could
1937 * end up being unaligned) and on the kernel's local stack.
1938 */
1939int ircopyptr(a, b, c)
1940void *a, *b;
1941size_t c;
1942{
1943 caddr_t ca;
1944 int err;
1945
1946#if SOLARIS
1947 if (copyin(a, (char *)&ca, sizeof(ca)))
1948 return EFAULT;
1949#else
1950 bcopy(a, &ca, sizeof(ca));
1951#endif
1952 err = copyin(ca, b, c);
1953 if (err)
1954 err = EFAULT;
1955 return err;
1956}
1957
1958
1959int iwcopyptr(a, b, c)
1960void *a, *b;
1961size_t c;
1962{
1963 caddr_t ca;
1964 int err;
1965
1966#if SOLARIS
1967 if (copyin(b, (char *)&ca, sizeof(ca)))
1968 return EFAULT;
1969#else
1970 bcopy(b, &ca, sizeof(ca));
1971#endif
1972 err = copyout(a, ca, c);
1973 if (err)
1974 err = EFAULT;
1975 return err;
1976}
1977
1978#else /* _KERNEL */
1979
1980
1981/*
1982 * return the first IP Address associated with an interface
1983 */
1984int fr_ifpaddr(v, ifptr, inp)
1985int v;
1986void *ifptr;
1987struct in_addr *inp;
1988{
1989 return 0;
1990}
1991
1992
1993int ircopyptr(a, b, c)
1994void *a, *b;
1995size_t c;
1996{
1997 caddr_t ca;
1998
1999 bcopy(a, &ca, sizeof(ca));
2000 bcopy(ca, b, c);
2001 return 0;
2002}
2003
2004
2005int iwcopyptr(a, b, c)
2006void *a, *b;
2007size_t c;
2008{
2009 caddr_t ca;
2010
2011 bcopy(b, &ca, sizeof(ca));
2012 bcopy(a, ca, c);
2013 return 0;
2014}
2015
2016
2017#endif
2018
2019
2020int fr_lock(data, lockp)
2021caddr_t data;
2022int *lockp;
2023{
2024 int arg, error;
2025
2026 error = IRCOPY(data, (caddr_t)&arg, sizeof(arg));
2027 if (!error) {
2028 error = IWCOPY((caddr_t)lockp, data, sizeof(*lockp));
2029 if (!error)
2030 *lockp = arg;
2031 }
2032 return error;
2033}
2034
2035
2036void fr_getstat(fiop)
2037friostat_t *fiop;
2038{
2039 bcopy((char *)frstats, (char *)fiop->f_st, sizeof(filterstats_t) * 2);
2040 fiop->f_locks[0] = fr_state_lock;
2041 fiop->f_locks[1] = fr_nat_lock;
2042 fiop->f_locks[2] = fr_frag_lock;
2043 fiop->f_locks[3] = fr_auth_lock;
2044 fiop->f_fin[0] = ipfilter[0][0];
2045 fiop->f_fin[1] = ipfilter[0][1];
2046 fiop->f_fout[0] = ipfilter[1][0];
2047 fiop->f_fout[1] = ipfilter[1][1];
2048 fiop->f_acctin[0] = ipacct[0][0];
2049 fiop->f_acctin[1] = ipacct[0][1];
2050 fiop->f_acctout[0] = ipacct[1][0];
2051 fiop->f_acctout[1] = ipacct[1][1];
2052#ifdef USE_INET6
2053 fiop->f_fin6[0] = ipfilter6[0][0];
2054 fiop->f_fin6[1] = ipfilter6[0][1];
2055 fiop->f_fout6[0] = ipfilter6[1][0];
2056 fiop->f_fout6[1] = ipfilter6[1][1];
2057 fiop->f_acctin6[0] = ipacct6[0][0];
2058 fiop->f_acctin6[1] = ipacct6[0][1];
2059 fiop->f_acctout6[0] = ipacct6[1][0];
2060 fiop->f_acctout6[1] = ipacct6[1][1];
2061#else
2062 fiop->f_fin6[0] = NULL;
2063 fiop->f_fin6[1] = NULL;
2064 fiop->f_fout6[0] = NULL;
2065 fiop->f_fout6[1] = NULL;
2066 fiop->f_acctin6[0] = NULL;
2067 fiop->f_acctin6[1] = NULL;
2068 fiop->f_acctout6[0] = NULL;
2069 fiop->f_acctout6[1] = NULL;
2070#endif
2071 fiop->f_active = fr_active;
2072 fiop->f_froute[0] = ipl_frouteok[0];
2073 fiop->f_froute[1] = ipl_frouteok[1];
2074
2075 fiop->f_running = fr_running;
2076 fiop->f_groups[0][0] = ipfgroups[0][0];
2077 fiop->f_groups[0][1] = ipfgroups[0][1];
2078 fiop->f_groups[1][0] = ipfgroups[1][0];
2079 fiop->f_groups[1][1] = ipfgroups[1][1];
2080 fiop->f_groups[2][0] = ipfgroups[2][0];
2081 fiop->f_groups[2][1] = ipfgroups[2][1];
2082#ifdef IPFILTER_LOG
2083 fiop->f_logging = 1;
2084#else
2085 fiop->f_logging = 0;
2086#endif
2087 fiop->f_defpass = fr_pass;
2088 strncpy(fiop->f_version, ipfilter_version, sizeof(fiop->f_version));
2089}
2090
2091
2092#ifdef USE_INET6
2093int icmptoicmp6types[ICMP_MAXTYPE+1] = {
2094 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
2095 -1, /* 1: UNUSED */
2096 -1, /* 2: UNUSED */
2097 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
2098 -1, /* 4: ICMP_SOURCEQUENCH */
2099 ND_REDIRECT, /* 5: ICMP_REDIRECT */
2100 -1, /* 6: UNUSED */
2101 -1, /* 7: UNUSED */
2102 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
2103 -1, /* 9: UNUSED */
2104 -1, /* 10: UNUSED */
2105 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
2106 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
2107 -1, /* 13: ICMP_TSTAMP */
2108 -1, /* 14: ICMP_TSTAMPREPLY */
2109 -1, /* 15: ICMP_IREQ */
2110 -1, /* 16: ICMP_IREQREPLY */
2111 -1, /* 17: ICMP_MASKREQ */
2112 -1, /* 18: ICMP_MASKREPLY */
2113};
2114
2115
2116int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
2117 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
2118 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
2119 -1, /* 2: ICMP_UNREACH_PROTOCOL */
2120 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
2121 -1, /* 4: ICMP_UNREACH_NEEDFRAG */
2122 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
2123 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
2124 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
2125 -1, /* 8: ICMP_UNREACH_ISOLATED */
2126 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
2127 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
2128 -1, /* 11: ICMP_UNREACH_TOSNET */
2129 -1, /* 12: ICMP_UNREACH_TOSHOST */
2130 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
2131};
2132#endif