FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_fw.c
1 /* $FreeBSD: releng/5.1/sys/netinet6/ip6_fw.c 111119 2003-02-19 05:47:46Z imp $ */
2 /* $KAME: ip6_fw.c,v 1.21 2001/01/24 01:25:32 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Copyright (c) 1993 Daniel Boulet
35 * Copyright (c) 1994 Ugen J.S.Antsilevich
36 * Copyright (c) 1996 Alex Nash
37 *
38 * Redistribution and use in source forms, with and without modification,
39 * are permitted provided that this entire comment appears intact.
40 *
41 * Redistribution in binary form may occur without any restrictions.
42 * Obviously, it would be nice if you gave credit where credit is due
43 * but requiring it would be too onerous.
44 *
45 * This software is provided ``AS IS'' without any warranties of any kind.
46 */
47
48 /*
49 * Implement IPv6 packet firewall
50 */
51
52 #if !defined(KLD_MODULE)
53 #include "opt_ip6fw.h"
54 #include "opt_inet.h"
55 #include "opt_inet6.h"
56 #endif
57
58 #ifdef IP6DIVERT
59 #error "NOT SUPPORTED IPV6 DIVERT"
60 #endif
61 #ifdef IP6FW_DIVERT_RESTART
62 #error "NOT SUPPORTED IPV6 DIVERT"
63 #endif
64
65 #include <sys/param.h>
66 #include <sys/systm.h>
67 #include <sys/malloc.h>
68 #include <sys/mbuf.h>
69 #include <sys/queue.h>
70 #include <sys/kernel.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/syslog.h>
74 #include <sys/time.h>
75 #include <net/if.h>
76 #include <net/route.h>
77 #include <netinet/in_systm.h>
78 #include <netinet/in.h>
79 #include <netinet/ip.h>
80
81 #include <netinet/ip6.h>
82 #include <netinet6/ip6_var.h>
83 #include <netinet6/in6_var.h>
84 #include <netinet/icmp6.h>
85
86 #include <netinet/in_pcb.h>
87
88 #include <netinet6/ip6_fw.h>
89 #include <netinet/ip_var.h>
90 #include <netinet/tcp.h>
91 #include <netinet/tcp_seq.h>
92 #include <netinet/tcp_timer.h>
93 #include <netinet/tcp_var.h>
94 #include <netinet/udp.h>
95
96 #include <sys/sysctl.h>
97
98 #include <net/net_osdep.h>
99
100 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");
101
102 static int fw6_debug = 1;
103 #ifdef IPV6FIREWALL_VERBOSE
104 static int fw6_verbose = 1;
105 #else
106 static int fw6_verbose = 0;
107 #endif
108 #ifdef IPV6FIREWALL_VERBOSE_LIMIT
109 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
110 #else
111 static int fw6_verbose_limit = 0;
112 #endif
113
114 static LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;
115
116 #ifdef SYSCTL_NODE
117 SYSCTL_DECL(_net_inet6_ip6);
118 SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW | CTLFLAG_SECURE,
119 0, "Firewall");
120 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW | CTLFLAG_SECURE,
121 &ip6_fw_enable, 0, "Enable ip6fw");
122 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW, &fw6_debug, 0, "");
123 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW | CTLFLAG_SECURE,
124 &fw6_verbose, 0, "");
125 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW, &fw6_verbose_limit, 0, "");
126 #endif
127
128 #define dprintf(a) do { \
129 if (fw6_debug) \
130 printf a; \
131 } while (0)
132 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
133
134 static int add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl));
135 static int del_entry6 __P((struct ip6_fw_head *chainptr, u_short number));
136 static int zero_entry6 __P((struct mbuf *m));
137 static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m));
138 static struct ip6_fw *check_ip6fw_mbuf __P((struct mbuf *fw));
139 static int ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f,
140 struct mbuf **m,
141 int *off, int *nxt, u_short *offset));
142 static int port_match6 __P((u_short *portptr, int nports, u_short port,
143 int range_flag));
144 static int tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f));
145 static int icmp6type_match __P((struct icmp6_hdr * icmp, struct ip6_fw * f));
146 static void ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6,
147 struct ifnet *rif, struct ifnet *oif, int off, int nxt));
148
149 static int ip6_fw_chk __P((struct ip6_hdr **pip6,
150 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m));
151 static int ip6_fw_ctl __P((int stage, struct mbuf **mm));
152
153 static char err_prefix[] = "ip6_fw_ctl:";
154
155 /*
156 * Returns 1 if the port is matched by the vector, 0 otherwise
157 */
158 static
159 __inline int
160 port_match6(u_short *portptr, int nports, u_short port, int range_flag)
161 {
162 if (!nports)
163 return 1;
164 if (range_flag) {
165 if (portptr[0] <= port && port <= portptr[1]) {
166 return 1;
167 }
168 nports -= 2;
169 portptr += 2;
170 }
171 while (nports-- > 0) {
172 if (*portptr++ == port) {
173 return 1;
174 }
175 }
176 return 0;
177 }
178
179 static int
180 tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f)
181 {
182 u_char flg_set, flg_clr;
183
184 /*
185 * If an established connection is required, reject packets that
186 * have only SYN of RST|ACK|SYN set. Otherwise, fall through to
187 * other flag requirements.
188 */
189 if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) &&
190 ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK |
191 IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN))
192 return 0;
193
194 flg_set = tcp6->th_flags & f->fw_tcpf;
195 flg_clr = tcp6->th_flags & f->fw_tcpnf;
196
197 if (flg_set != f->fw_tcpf)
198 return 0;
199 if (flg_clr)
200 return 0;
201
202 return 1;
203 }
204
205 static int
206 icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f)
207 {
208 int type;
209
210 if (!(f->fw_flg & IPV6_FW_F_ICMPBIT))
211 return(1);
212
213 type = icmp6->icmp6_type;
214
215 /* check for matching type in the bitmap */
216 if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 &&
217 (f->fw_icmp6types[type / (sizeof(unsigned) * 8)] &
218 (1U << (type % (8 * sizeof(unsigned))))))
219 return(1);
220
221 return(0); /* no match */
222 }
223
224 static int
225 is_icmp6_query(struct ip6_hdr *ip6, int off)
226 {
227 const struct icmp6_hdr *icmp6;
228 int icmp6_type;
229
230 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
231 icmp6_type = icmp6->icmp6_type;
232
233 if (icmp6_type == ICMP6_ECHO_REQUEST ||
234 icmp6_type == ICMP6_MEMBERSHIP_QUERY ||
235 icmp6_type == ICMP6_WRUREQUEST ||
236 icmp6_type == ICMP6_FQDN_QUERY ||
237 icmp6_type == ICMP6_NI_QUERY)
238 return(1);
239
240 return(0);
241 }
242
243 static int
244 ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m,
245 int *off, int *nxt, u_short *offset)
246 {
247 int len;
248 struct ip6_hdr *ip6 = *pip6;
249 struct ip6_ext *ip6e;
250 u_char opts, nopts, nopts_sve;
251
252 opts = f->fw_ip6opt;
253 nopts = nopts_sve = f->fw_ip6nopt;
254
255 *nxt = ip6->ip6_nxt;
256 *off = sizeof(struct ip6_hdr);
257 len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
258 while (*off < len) {
259 ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off);
260 if ((*m)->m_len < *off + sizeof(*ip6e))
261 goto opts_check; /* XXX */
262
263 switch(*nxt) {
264 case IPPROTO_FRAGMENT:
265 if ((*m)->m_len >= *off + sizeof(struct ip6_frag)) {
266 struct ip6_frag *ip6f;
267
268 ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off);
269 *offset = ip6f->ip6f_offlg & IP6F_OFF_MASK;
270 }
271 opts &= ~IPV6_FW_IP6OPT_FRAG;
272 nopts &= ~IPV6_FW_IP6OPT_FRAG;
273 *off += sizeof(struct ip6_frag);
274 break;
275 case IPPROTO_AH:
276 opts &= ~IPV6_FW_IP6OPT_AH;
277 nopts &= ~IPV6_FW_IP6OPT_AH;
278 *off += (ip6e->ip6e_len + 2) << 2;
279 break;
280 default:
281 switch (*nxt) {
282 case IPPROTO_HOPOPTS:
283 opts &= ~IPV6_FW_IP6OPT_HOPOPT;
284 nopts &= ~IPV6_FW_IP6OPT_HOPOPT;
285 break;
286 case IPPROTO_ROUTING:
287 opts &= ~IPV6_FW_IP6OPT_ROUTE;
288 nopts &= ~IPV6_FW_IP6OPT_ROUTE;
289 break;
290 case IPPROTO_ESP:
291 opts &= ~IPV6_FW_IP6OPT_ESP;
292 nopts &= ~IPV6_FW_IP6OPT_ESP;
293 break;
294 case IPPROTO_NONE:
295 opts &= ~IPV6_FW_IP6OPT_NONXT;
296 nopts &= ~IPV6_FW_IP6OPT_NONXT;
297 goto opts_check;
298 break;
299 case IPPROTO_DSTOPTS:
300 opts &= ~IPV6_FW_IP6OPT_OPTS;
301 nopts &= ~IPV6_FW_IP6OPT_OPTS;
302 break;
303 default:
304 goto opts_check;
305 break;
306 }
307 *off += (ip6e->ip6e_len + 1) << 3;
308 break;
309 }
310 *nxt = ip6e->ip6e_nxt;
311
312 }
313 opts_check:
314 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */
315 return 1;
316
317 if (opts == 0 && nopts == nopts_sve)
318 return 1;
319 else
320 return 0;
321 }
322
323 static
324 __inline int
325 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
326 {
327 /* Check by name or by IP address */
328 if (byname) {
329 /* Check unit number (-1 is wildcard) */
330 if (ifu->fu_via_if.unit != -1
331 && ifp->if_unit != ifu->fu_via_if.unit)
332 return(0);
333 /* Check name */
334 if (strncmp(ifp->if_name, ifu->fu_via_if.name, IP6FW_IFNLEN))
335 return(0);
336 return(1);
337 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */
338 struct ifaddr *ia;
339
340 for (ia = ifp->if_addrlist.tqh_first; ia; ia = ia->ifa_list.tqe_next)
341 {
342
343 if (ia->ifa_addr == NULL)
344 continue;
345 if (ia->ifa_addr->sa_family != AF_INET6)
346 continue;
347 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
348 &(((struct sockaddr_in6 *)
349 (ia->ifa_addr))->sin6_addr)))
350 continue;
351 return(1);
352 }
353 return(0);
354 }
355 return(1);
356 }
357
358 static void
359 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
360 struct ifnet *rif, struct ifnet *oif, int off, int nxt)
361 {
362 static int counter;
363 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
364 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
365 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
366 int count;
367 char *action;
368 char action2[32], proto[102], name[18];
369 int len;
370
371 count = f ? f->fw_pcnt : ++counter;
372 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
373 return;
374
375 /* Print command name */
376 snprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1);
377
378 action = action2;
379 if (!f)
380 action = "Refuse";
381 else {
382 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
383 case IPV6_FW_F_DENY:
384 action = "Deny";
385 break;
386 case IPV6_FW_F_REJECT:
387 if (f->fw_reject_code == IPV6_FW_REJECT_RST)
388 action = "Reset";
389 else
390 action = "Unreach";
391 break;
392 case IPV6_FW_F_ACCEPT:
393 action = "Accept";
394 break;
395 case IPV6_FW_F_COUNT:
396 action = "Count";
397 break;
398 case IPV6_FW_F_DIVERT:
399 snprintf(SNPARGS(action2, 0), "Divert %d",
400 f->fw_divert_port);
401 break;
402 case IPV6_FW_F_TEE:
403 snprintf(SNPARGS(action2, 0), "Tee %d",
404 f->fw_divert_port);
405 break;
406 case IPV6_FW_F_SKIPTO:
407 snprintf(SNPARGS(action2, 0), "SkipTo %d",
408 f->fw_skipto_rule);
409 break;
410 default:
411 action = "UNKNOWN";
412 break;
413 }
414 }
415
416 switch (nxt) {
417 case IPPROTO_TCP:
418 len = snprintf(SNPARGS(proto, 0), "TCP [%s]",
419 ip6_sprintf(&ip6->ip6_src));
420 if (off > 0)
421 len += snprintf(SNPARGS(proto, len), ":%d ",
422 ntohs(tcp6->th_sport));
423 else
424 len += snprintf(SNPARGS(proto, len), " ");
425 len += snprintf(SNPARGS(proto, len), "[%s]",
426 ip6_sprintf(&ip6->ip6_dst));
427 if (off > 0)
428 snprintf(SNPARGS(proto, len), ":%d",
429 ntohs(tcp6->th_dport));
430 break;
431 case IPPROTO_UDP:
432 len = snprintf(SNPARGS(proto, 0), "UDP [%s]",
433 ip6_sprintf(&ip6->ip6_src));
434 if (off > 0)
435 len += snprintf(SNPARGS(proto, len), ":%d ",
436 ntohs(udp->uh_sport));
437 else
438 len += snprintf(SNPARGS(proto, len), " ");
439 len += snprintf(SNPARGS(proto, len), "[%s]",
440 ip6_sprintf(&ip6->ip6_dst));
441 if (off > 0)
442 snprintf(SNPARGS(proto, len), ":%d",
443 ntohs(udp->uh_dport));
444 break;
445 case IPPROTO_ICMPV6:
446 if (off > 0)
447 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ",
448 icmp6->icmp6_type, icmp6->icmp6_code);
449 else
450 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP ");
451 len += snprintf(SNPARGS(proto, len), "[%s]",
452 ip6_sprintf(&ip6->ip6_src));
453 snprintf(SNPARGS(proto, len), " [%s]",
454 ip6_sprintf(&ip6->ip6_dst));
455 break;
456 default:
457 len = snprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt,
458 ip6_sprintf(&ip6->ip6_src));
459 snprintf(SNPARGS(proto, len), " [%s]",
460 ip6_sprintf(&ip6->ip6_dst));
461 break;
462 }
463
464 if (oif)
465 log(LOG_SECURITY | LOG_INFO, "%s %s %s out via %s\n",
466 name, action, proto, if_name(oif));
467 else if (rif)
468 log(LOG_SECURITY | LOG_INFO, "%s %s %s in via %s\n",
469 name, action, proto, if_name(rif));
470 else
471 log(LOG_SECURITY | LOG_INFO, "%s %s %s",
472 name, action, proto);
473 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
474 log(LOG_SECURITY | LOG_INFO, "ip6fw: limit reached on entry %d\n",
475 f ? f->fw_number : -1);
476 }
477
478 /*
479 * Parameters:
480 *
481 * ip Pointer to packet header (struct ip6_hdr *)
482 * hlen Packet header length
483 * oif Outgoing interface, or NULL if packet is incoming
484 * #ifndef IP6FW_DIVERT_RESTART
485 * *cookie Ignore all divert/tee rules to this port (if non-zero)
486 * #else
487 * *cookie Skip up to the first rule past this rule number;
488 * #endif
489 * *m The packet; we set to NULL when/if we nuke it.
490 *
491 * Return value:
492 *
493 * 0 The packet is to be accepted and routed normally OR
494 * the packet was denied/rejected and has been dropped;
495 * in the latter case, *m is equal to NULL upon return.
496 * port Divert the packet to port.
497 */
498
499 static int
500 ip6_fw_chk(struct ip6_hdr **pip6,
501 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
502 {
503 struct ip6_fw_chain *chain;
504 struct ip6_fw *rule = NULL;
505 struct ip6_hdr *ip6 = *pip6;
506 struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
507 u_short offset = 0;
508 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
509 u_short src_port, dst_port;
510 #ifdef IP6FW_DIVERT_RESTART
511 u_int16_t skipto = *cookie;
512 #else
513 u_int16_t ignport = ntohs(*cookie);
514 #endif
515
516 *cookie = 0;
517 /*
518 * Go down the chain, looking for enlightment
519 * #ifdef IP6FW_DIVERT_RESTART
520 * If we've been asked to start at a given rule immediatly, do so.
521 * #endif
522 */
523 chain = LIST_FIRST(&ip6_fw_chain);
524 #ifdef IP6FW_DIVERT_RESTART
525 if (skipto) {
526 if (skipto >= 65535)
527 goto dropit;
528 while (chain && (chain->rule->fw_number <= skipto)) {
529 chain = LIST_NEXT(chain, chain);
530 }
531 if (! chain) goto dropit;
532 }
533 #endif /* IP6FW_DIVERT_RESTART */
534 for (; chain; chain = LIST_NEXT(chain, chain)) {
535 struct ip6_fw *const f = chain->rule;
536
537 if (oif) {
538 /* Check direction outbound */
539 if (!(f->fw_flg & IPV6_FW_F_OUT))
540 continue;
541 } else {
542 /* Check direction inbound */
543 if (!(f->fw_flg & IPV6_FW_F_IN))
544 continue;
545 }
546
547 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
548 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
549 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
550 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
551 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))
552
553 /* If src-addr doesn't match, not this rule. */
554 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
555 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
556 continue;
557
558 /* If dest-addr doesn't match, not this rule. */
559 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
560 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
561 continue;
562
563 #undef IN6_ARE_ADDR_MASKEQUAL
564 /* Interface check */
565 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
566 struct ifnet *const iface = oif ? oif : rif;
567
568 /* Backwards compatibility hack for "via" */
569 if (!iface || !iface_match(iface,
570 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
571 continue;
572 } else {
573 /* Check receive interface */
574 if ((f->fw_flg & IPV6_FW_F_IIFACE)
575 && (!rif || !iface_match(rif,
576 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
577 continue;
578 /* Check outgoing interface */
579 if ((f->fw_flg & IPV6_FW_F_OIFACE)
580 && (!oif || !iface_match(oif,
581 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
582 continue;
583 }
584
585 /* Check IP options */
586 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
587 continue;
588
589 /* Fragments */
590 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
591 continue;
592
593 /* Check protocol; if wildcard, match */
594 if (f->fw_prot == IPPROTO_IPV6)
595 goto got_match;
596
597 /* If different, don't match */
598 if (nxt != f->fw_prot)
599 continue;
600
601 #define PULLUP_TO(len) do { \
602 if ((*m)->m_len < (len) \
603 && (*m = m_pullup(*m, (len))) == 0) { \
604 goto dropit; \
605 } \
606 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \
607 } while (0)
608
609 /* Protocol specific checks */
610 switch (nxt) {
611 case IPPROTO_TCP:
612 {
613 struct tcphdr *tcp6;
614
615 if (offset == 1) { /* cf. RFC 1858 */
616 PULLUP_TO(off + 4); /* XXX ? */
617 goto bogusfrag;
618 }
619 if (offset != 0) {
620 /*
621 * TCP flags and ports aren't available in this
622 * packet -- if this rule specified either one,
623 * we consider the rule a non-match.
624 */
625 if (f->fw_nports != 0 ||
626 f->fw_tcpf != f->fw_tcpnf)
627 continue;
628
629 break;
630 }
631 PULLUP_TO(off + 14);
632 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
633 if (((f->fw_tcpf != f->fw_tcpnf) ||
634 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) &&
635 !tcp6flg_match(tcp6, f))
636 continue;
637 src_port = ntohs(tcp6->th_sport);
638 dst_port = ntohs(tcp6->th_dport);
639 goto check_ports;
640 }
641
642 case IPPROTO_UDP:
643 {
644 struct udphdr *udp;
645
646 if (offset != 0) {
647 /*
648 * Port specification is unavailable -- if this
649 * rule specifies a port, we consider the rule
650 * a non-match.
651 */
652 if (f->fw_nports != 0)
653 continue;
654
655 break;
656 }
657 PULLUP_TO(off + 4);
658 udp = (struct udphdr *) ((caddr_t)ip6 + off);
659 src_port = ntohs(udp->uh_sport);
660 dst_port = ntohs(udp->uh_dport);
661 check_ports:
662 if (!port_match6(&f->fw_pts[0],
663 IPV6_FW_GETNSRCP(f), src_port,
664 f->fw_flg & IPV6_FW_F_SRNG))
665 continue;
666 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
667 IPV6_FW_GETNDSTP(f), dst_port,
668 f->fw_flg & IPV6_FW_F_DRNG))
669 continue;
670 break;
671 }
672
673 case IPPROTO_ICMPV6:
674 {
675 struct icmp6_hdr *icmp;
676
677 if (offset != 0) /* Type isn't valid */
678 break;
679 PULLUP_TO(off + 2);
680 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
681 if (!icmp6type_match(icmp, f))
682 continue;
683 break;
684 }
685 #undef PULLUP_TO
686
687 bogusfrag:
688 if (fw6_verbose)
689 ip6fw_report(NULL, ip6, rif, oif, off, nxt);
690 goto dropit;
691 }
692
693 got_match:
694 #ifndef IP6FW_DIVERT_RESTART
695 /* Ignore divert/tee rule if socket port is "ignport" */
696 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
697 case IPV6_FW_F_DIVERT:
698 case IPV6_FW_F_TEE:
699 if (f->fw_divert_port == ignport)
700 continue; /* ignore this rule */
701 break;
702 }
703
704 #endif /* IP6FW_DIVERT_RESTART */
705 /* Update statistics */
706 f->fw_pcnt += 1;
707 f->fw_bcnt += ntohs(ip6->ip6_plen);
708 f->timestamp = time_second;
709
710 /* Log to console if desired */
711 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
712 ip6fw_report(f, ip6, rif, oif, off, nxt);
713
714 /* Take appropriate action */
715 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
716 case IPV6_FW_F_ACCEPT:
717 return(0);
718 case IPV6_FW_F_COUNT:
719 continue;
720 case IPV6_FW_F_DIVERT:
721 #ifdef IP6FW_DIVERT_RESTART
722 *cookie = f->fw_number;
723 #else
724 *cookie = htons(f->fw_divert_port);
725 #endif /* IP6FW_DIVERT_RESTART */
726 return(f->fw_divert_port);
727 case IPV6_FW_F_TEE:
728 /*
729 * XXX someday tee packet here, but beware that you
730 * can't use m_copym() or m_copypacket() because
731 * the divert input routine modifies the mbuf
732 * (and these routines only increment reference
733 * counts in the case of mbuf clusters), so need
734 * to write custom routine.
735 */
736 continue;
737 case IPV6_FW_F_SKIPTO:
738 #ifdef DIAGNOSTIC
739 while (chain->chain.le_next
740 && chain->chain.le_next->rule->fw_number
741 < f->fw_skipto_rule)
742 #else
743 while (chain->chain.le_next->rule->fw_number
744 < f->fw_skipto_rule)
745 #endif
746 chain = chain->chain.le_next;
747 continue;
748 }
749
750 /* Deny/reject this packet using this rule */
751 rule = f;
752 break;
753 }
754
755 #ifdef DIAGNOSTIC
756 /* Rule 65535 should always be there and should always match */
757 if (!chain)
758 panic("ip6_fw: chain");
759 #endif
760
761 /*
762 * At this point, we're going to drop the packet.
763 * Send a reject notice if all of the following are true:
764 *
765 * - The packet matched a reject rule
766 * - The packet is not an ICMP packet, or is an ICMP query packet
767 * - The packet is not a multicast or broadcast packet
768 */
769 if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
770 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
771 && !((*m)->m_flags & (M_BCAST|M_MCAST))
772 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
773 switch (rule->fw_reject_code) {
774 case IPV6_FW_REJECT_RST:
775 {
776 struct tcphdr *const tcp =
777 (struct tcphdr *) ((caddr_t)ip6 + off);
778 struct {
779 struct ip6_hdr ip6;
780 struct tcphdr th;
781 } ti;
782 tcp_seq ack, seq;
783 int flags;
784
785 if (offset != 0 || (tcp->th_flags & TH_RST))
786 break;
787
788 ti.ip6 = *ip6;
789 ti.th = *tcp;
790 ti.th.th_seq = ntohl(ti.th.th_seq);
791 ti.th.th_ack = ntohl(ti.th.th_ack);
792 ti.ip6.ip6_nxt = IPPROTO_TCP;
793 if (ti.th.th_flags & TH_ACK) {
794 ack = 0;
795 seq = ti.th.th_ack;
796 flags = TH_RST;
797 } else {
798 ack = ti.th.th_seq;
799 if (((*m)->m_flags & M_PKTHDR) != 0) {
800 ack += (*m)->m_pkthdr.len - off
801 - (ti.th.th_off << 2);
802 } else if (ip6->ip6_plen) {
803 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
804 - off - (ti.th.th_off << 2);
805 } else {
806 m_freem(*m);
807 *m = 0;
808 break;
809 }
810 seq = 0;
811 flags = TH_RST|TH_ACK;
812 }
813 bcopy(&ti, ip6, sizeof(ti));
814 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1),
815 *m, ack, seq, flags);
816 *m = NULL;
817 break;
818 }
819 default: /* Send an ICMP unreachable using code */
820 if (oif)
821 (*m)->m_pkthdr.rcvif = oif;
822 icmp6_error(*m, ICMP6_DST_UNREACH,
823 rule->fw_reject_code, 0);
824 *m = NULL;
825 break;
826 }
827 }
828
829 dropit:
830 /*
831 * Finally, drop the packet.
832 */
833 if (*m) {
834 m_freem(*m);
835 *m = NULL;
836 }
837 return(0);
838 }
839
840 static int
841 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
842 {
843 struct ip6_fw *ftmp = 0;
844 struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
845 u_short nbr = 0;
846 int s;
847
848 fwc = malloc(sizeof *fwc, M_IP6FW, M_NOWAIT);
849 ftmp = malloc(sizeof *ftmp, M_IP6FW, M_NOWAIT);
850 if (!fwc || !ftmp) {
851 dprintf(("%s malloc said no\n", err_prefix));
852 if (fwc) free(fwc, M_IP6FW);
853 if (ftmp) free(ftmp, M_IP6FW);
854 return (ENOSPC);
855 }
856
857 bcopy(frwl, ftmp, sizeof(struct ip6_fw));
858 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
859 ftmp->fw_pcnt = 0L;
860 ftmp->fw_bcnt = 0L;
861 fwc->rule = ftmp;
862
863 s = splnet();
864
865 if (!chainptr->lh_first) {
866 LIST_INSERT_HEAD(chainptr, fwc, chain);
867 splx(s);
868 return(0);
869 } else if (ftmp->fw_number == (u_short)-1) {
870 if (fwc) free(fwc, M_IP6FW);
871 if (ftmp) free(ftmp, M_IP6FW);
872 splx(s);
873 dprintf(("%s bad rule number\n", err_prefix));
874 return (EINVAL);
875 }
876
877 /* If entry number is 0, find highest numbered rule and add 100 */
878 if (ftmp->fw_number == 0) {
879 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
880 if (fcp->rule->fw_number != (u_short)-1)
881 nbr = fcp->rule->fw_number;
882 else
883 break;
884 }
885 if (nbr < (u_short)-1 - 100)
886 nbr += 100;
887 ftmp->fw_number = nbr;
888 }
889
890 /* Got a valid number; now insert it, keeping the list ordered */
891 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
892 if (fcp->rule->fw_number > ftmp->fw_number) {
893 if (fcpl) {
894 LIST_INSERT_AFTER(fcpl, fwc, chain);
895 } else {
896 LIST_INSERT_HEAD(chainptr, fwc, chain);
897 }
898 break;
899 } else {
900 fcpl = fcp;
901 }
902 }
903
904 splx(s);
905 return (0);
906 }
907
908 static int
909 del_entry6(struct ip6_fw_head *chainptr, u_short number)
910 {
911 struct ip6_fw_chain *fcp;
912 int s;
913
914 s = splnet();
915
916 fcp = chainptr->lh_first;
917 if (number != (u_short)-1) {
918 for (; fcp; fcp = fcp->chain.le_next) {
919 if (fcp->rule->fw_number == number) {
920 LIST_REMOVE(fcp, chain);
921 splx(s);
922 free(fcp->rule, M_IP6FW);
923 free(fcp, M_IP6FW);
924 return 0;
925 }
926 }
927 }
928
929 splx(s);
930 return (EINVAL);
931 }
932
933 static int
934 zero_entry6(struct mbuf *m)
935 {
936 struct ip6_fw *frwl;
937 struct ip6_fw_chain *fcp;
938 int s;
939
940 if (m && m->m_len != 0) {
941 if (m->m_len != sizeof(struct ip6_fw))
942 return(EINVAL);
943 frwl = mtod(m, struct ip6_fw *);
944 }
945 else
946 frwl = NULL;
947
948 /*
949 * It's possible to insert multiple chain entries with the
950 * same number, so we don't stop after finding the first
951 * match if zeroing a specific entry.
952 */
953 s = splnet();
954 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
955 if (!frwl || frwl->fw_number == fcp->rule->fw_number) {
956 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
957 fcp->rule->timestamp = 0;
958 }
959 splx(s);
960
961 if (fw6_verbose) {
962 if (frwl)
963 log(LOG_SECURITY | LOG_NOTICE,
964 "ip6fw: Entry %d cleared.\n", frwl->fw_number);
965 else
966 log(LOG_SECURITY | LOG_NOTICE,
967 "ip6fw: Accounting cleared.\n");
968 }
969
970 return(0);
971 }
972
973 static struct ip6_fw *
974 check_ip6fw_mbuf(struct mbuf *m)
975 {
976 /* Check length */
977 if (m->m_len != sizeof(struct ip6_fw)) {
978 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len,
979 sizeof(struct ip6_fw)));
980 return (NULL);
981 }
982 return(check_ip6fw_struct(mtod(m, struct ip6_fw *)));
983 }
984
985 static struct ip6_fw *
986 check_ip6fw_struct(struct ip6_fw *frwl)
987 {
988 /* Check for invalid flag bits */
989 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
990 dprintf(("%s undefined flag bits set (flags=%x)\n",
991 err_prefix, frwl->fw_flg));
992 return (NULL);
993 }
994 /* Must apply to incoming or outgoing (or both) */
995 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
996 dprintf(("%s neither in nor out\n", err_prefix));
997 return (NULL);
998 }
999 /* Empty interface name is no good */
1000 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
1001 && !*frwl->fw_in_if.fu_via_if.name)
1002 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
1003 && !*frwl->fw_out_if.fu_via_if.name)) {
1004 dprintf(("%s empty interface name\n", err_prefix));
1005 return (NULL);
1006 }
1007 /* Sanity check interface matching */
1008 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
1009 ; /* allow "via" backwards compatibility */
1010 } else if ((frwl->fw_flg & IPV6_FW_F_IN)
1011 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
1012 dprintf(("%s outgoing interface check on incoming\n",
1013 err_prefix));
1014 return (NULL);
1015 }
1016 /* Sanity check port ranges */
1017 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
1018 dprintf(("%s src range set but n_src_p=%d\n",
1019 err_prefix, IPV6_FW_GETNSRCP(frwl)));
1020 return (NULL);
1021 }
1022 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
1023 dprintf(("%s dst range set but n_dst_p=%d\n",
1024 err_prefix, IPV6_FW_GETNDSTP(frwl)));
1025 return (NULL);
1026 }
1027 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
1028 dprintf(("%s too many ports (%d+%d)\n",
1029 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
1030 return (NULL);
1031 }
1032 /*
1033 * Protocols other than TCP/UDP don't use port range
1034 */
1035 if ((frwl->fw_prot != IPPROTO_TCP) &&
1036 (frwl->fw_prot != IPPROTO_UDP) &&
1037 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
1038 dprintf(("%s port(s) specified for non TCP/UDP rule\n",
1039 err_prefix));
1040 return(NULL);
1041 }
1042
1043 /*
1044 * Rather than modify the entry to make such entries work,
1045 * we reject this rule and require user level utilities
1046 * to enforce whatever policy they deem appropriate.
1047 */
1048 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
1049 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
1050 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
1051 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
1052 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
1053 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
1054 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
1055 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
1056 dprintf(("%s rule never matches\n", err_prefix));
1057 return(NULL);
1058 }
1059
1060 if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
1061 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
1062 if (frwl->fw_nports) {
1063 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
1064 return(NULL);
1065 }
1066 if (frwl->fw_prot == IPPROTO_TCP &&
1067 frwl->fw_tcpf != frwl->fw_tcpnf) {
1068 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
1069 return(NULL);
1070 }
1071 }
1072
1073 /* Check command specific stuff */
1074 switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
1075 {
1076 case IPV6_FW_F_REJECT:
1077 if (frwl->fw_reject_code >= 0x100
1078 && !(frwl->fw_prot == IPPROTO_TCP
1079 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
1080 dprintf(("%s unknown reject code\n", err_prefix));
1081 return(NULL);
1082 }
1083 break;
1084 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */
1085 case IPV6_FW_F_TEE:
1086 if (frwl->fw_divert_port == 0) {
1087 dprintf(("%s can't divert to port 0\n", err_prefix));
1088 return (NULL);
1089 }
1090 break;
1091 case IPV6_FW_F_DENY:
1092 case IPV6_FW_F_ACCEPT:
1093 case IPV6_FW_F_COUNT:
1094 case IPV6_FW_F_SKIPTO:
1095 break;
1096 default:
1097 dprintf(("%s invalid command\n", err_prefix));
1098 return(NULL);
1099 }
1100
1101 return frwl;
1102 }
1103
1104 static int
1105 ip6_fw_ctl(int stage, struct mbuf **mm)
1106 {
1107 int error;
1108 struct mbuf *m;
1109
1110 if (stage == IPV6_FW_GET) {
1111 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1112 *mm = m = m_get(M_TRYWAIT, MT_DATA); /* XXX */
1113 if (!m)
1114 return(ENOBUFS);
1115 if (sizeof *(fcp->rule) > MLEN) {
1116 MCLGET(m, M_TRYWAIT);
1117 if ((m->m_flags & M_EXT) == 0) {
1118 m_free(m);
1119 return(ENOBUFS);
1120 }
1121 }
1122 for (; fcp; fcp = fcp->chain.le_next) {
1123 bcopy(fcp->rule, m->m_data, sizeof *(fcp->rule));
1124 m->m_len = sizeof *(fcp->rule);
1125 m->m_next = m_get(M_TRYWAIT, MT_DATA); /* XXX */
1126 if (!m->m_next) {
1127 m_freem(*mm);
1128 return(ENOBUFS);
1129 }
1130 m = m->m_next;
1131 if (sizeof *(fcp->rule) > MLEN) {
1132 MCLGET(m, M_TRYWAIT);
1133 if ((m->m_flags & M_EXT) == 0) {
1134 m_freem(*mm);
1135 return(ENOBUFS);
1136 }
1137 }
1138 m->m_len = 0;
1139 }
1140 return (0);
1141 }
1142 m = *mm;
1143 /* only allow get calls if secure mode > 2 */
1144 if (securelevel > 2) {
1145 if (m) {
1146 (void)m_freem(m);
1147 *mm = 0;
1148 }
1149 return(EPERM);
1150 }
1151 if (stage == IPV6_FW_FLUSH) {
1152 while (ip6_fw_chain.lh_first != NULL &&
1153 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) {
1154 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1155 int s = splnet();
1156 LIST_REMOVE(ip6_fw_chain.lh_first, chain);
1157 splx(s);
1158 free(fcp->rule, M_IP6FW);
1159 free(fcp, M_IP6FW);
1160 }
1161 if (m) {
1162 (void)m_freem(m);
1163 *mm = 0;
1164 }
1165 return (0);
1166 }
1167 if (stage == IPV6_FW_ZERO) {
1168 error = zero_entry6(m);
1169 if (m) {
1170 (void)m_freem(m);
1171 *mm = 0;
1172 }
1173 return (error);
1174 }
1175 if (m == NULL) {
1176 printf("%s NULL mbuf ptr\n", err_prefix);
1177 return (EINVAL);
1178 }
1179
1180 if (stage == IPV6_FW_ADD) {
1181 struct ip6_fw *frwl = check_ip6fw_mbuf(m);
1182
1183 if (!frwl)
1184 error = EINVAL;
1185 else
1186 error = add_entry6(&ip6_fw_chain, frwl);
1187 if (m) {
1188 (void)m_freem(m);
1189 *mm = 0;
1190 }
1191 return error;
1192 }
1193 if (stage == IPV6_FW_DEL) {
1194 if (m->m_len != sizeof(struct ip6_fw)) {
1195 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len,
1196 sizeof(struct ip6_fw)));
1197 error = EINVAL;
1198 } else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) {
1199 dprintf(("%s can't delete rule 65535\n", err_prefix));
1200 error = EINVAL;
1201 } else
1202 error = del_entry6(&ip6_fw_chain,
1203 mtod(m, struct ip6_fw *)->fw_number);
1204 if (m) {
1205 (void)m_freem(m);
1206 *mm = 0;
1207 }
1208 return error;
1209 }
1210
1211 dprintf(("%s unknown request %d\n", err_prefix, stage));
1212 if (m) {
1213 (void)m_freem(m);
1214 *mm = 0;
1215 }
1216 return (EINVAL);
1217 }
1218
1219 void
1220 ip6_fw_init(void)
1221 {
1222 struct ip6_fw default_rule;
1223
1224 ip6_fw_chk_ptr = ip6_fw_chk;
1225 ip6_fw_ctl_ptr = ip6_fw_ctl;
1226 LIST_INIT(&ip6_fw_chain);
1227
1228 bzero(&default_rule, sizeof default_rule);
1229 default_rule.fw_prot = IPPROTO_IPV6;
1230 default_rule.fw_number = (u_short)-1;
1231 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1232 default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
1233 #else
1234 default_rule.fw_flg |= IPV6_FW_F_DENY;
1235 #endif
1236 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
1237 if (check_ip6fw_struct(&default_rule) == NULL ||
1238 add_entry6(&ip6_fw_chain, &default_rule))
1239 panic(__func__);
1240
1241 printf("IPv6 packet filtering initialized, ");
1242 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1243 printf("default to accept, ");
1244 #endif
1245 #ifndef IPV6FIREWALL_VERBOSE
1246 printf("logging disabled\n");
1247 #else
1248 if (fw6_verbose_limit == 0)
1249 printf("unlimited logging\n");
1250 else
1251 printf("logging limited to %d packets/entry\n",
1252 fw6_verbose_limit);
1253 #endif
1254 }
1255
1256 static ip6_fw_chk_t *old_chk_ptr;
1257 static ip6_fw_ctl_t *old_ctl_ptr;
1258
1259 static int
1260 ip6fw_modevent(module_t mod, int type, void *unused)
1261 {
1262 int s;
1263
1264 switch (type) {
1265 case MOD_LOAD:
1266 s = splnet();
1267
1268 old_chk_ptr = ip6_fw_chk_ptr;
1269 old_ctl_ptr = ip6_fw_ctl_ptr;
1270
1271 ip6_fw_init();
1272 splx(s);
1273 return 0;
1274 case MOD_UNLOAD:
1275 s = splnet();
1276 ip6_fw_chk_ptr = old_chk_ptr;
1277 ip6_fw_ctl_ptr = old_ctl_ptr;
1278 while (LIST_FIRST(&ip6_fw_chain) != NULL) {
1279 struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain);
1280 LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain);
1281 free(fcp->rule, M_IP6FW);
1282 free(fcp, M_IP6FW);
1283 }
1284
1285 splx(s);
1286 printf("IPv6 firewall unloaded\n");
1287 return 0;
1288 default:
1289 break;
1290 }
1291 return 0;
1292 }
1293
1294 static moduledata_t ip6fwmod = {
1295 "ip6fw",
1296 ip6fw_modevent,
1297 0
1298 };
1299 DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 27712d3102dcfdee9a32d2f84a95c018
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