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Parallelize ifnet.if_addrhead accessing by duplicating the list itself
[dragonfly.git] / sys / net / ip6fw / ip6_fw.c
blobca8b94ee4fb5d8548ec1243cb058c29a9a1e21cd
1 /* $FreeBSD: src/sys/netinet6/ip6_fw.c,v 1.2.2.10 2003/08/03 17:52:54 ume Exp $ */
2 /* $DragonFly: src/sys/net/ip6fw/ip6_fw.c,v 1.19 2008/03/07 11:34:20 sephe Exp $ */
3 /* $KAME: ip6_fw.c,v 1.21 2001/01/24 01:25:32 itojun Exp $ */
4
5 /*
6 * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * Copyright (c) 1993 Daniel Boulet
36 * Copyright (c) 1994 Ugen J.S.Antsilevich
37 * Copyright (c) 1996 Alex Nash
38 *
39 * Redistribution and use in source forms, with and without modification,
40 * are permitted provided that this entire comment appears intact.
41 *
42 * Redistribution in binary form may occur without any restrictions.
43 * Obviously, it would be nice if you gave credit where credit is due
44 * but requiring it would be too onerous.
45 *
46 * This software is provided ``AS IS'' without any warranties of any kind.
47 */
48
49 /*
50 * Implement IPv6 packet firewall
51 */
52
53 #if !defined(KLD_MODULE)
54 #include "opt_ip6fw.h"
55 #include "opt_inet.h"
56 #include "opt_inet6.h"
57 #endif
58
59 #ifdef IP6DIVERT
60 #error "NOT SUPPORTED IPV6 DIVERT"
61 #endif
62 #ifdef IP6FW_DIVERT_RESTART
63 #error "NOT SUPPORTED IPV6 DIVERT"
64 #endif
65
66 #include <sys/param.h>
67 #include <sys/systm.h>
68 #include <sys/malloc.h>
69 #include <sys/mbuf.h>
70 #include <sys/queue.h>
71 #include <sys/kernel.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/syslog.h>
75 #include <sys/thread2.h>
76 #include <sys/time.h>
77 #include <net/if.h>
78 #include <net/route.h>
79 #include <netinet/in_systm.h>
80 #include <netinet/in.h>
81 #include <netinet/ip.h>
82
83 #include <netinet/ip6.h>
84 #include <netinet6/ip6_var.h>
85 #include <netinet6/in6_var.h>
86 #include <netinet/icmp6.h>
87
88 #include <netinet/in_pcb.h>
89
90 #include "ip6_fw.h"
91 #include <netinet/ip_var.h>
92 #include <netinet/tcp.h>
93 #include <netinet/tcp_seq.h>
94 #include <netinet/tcp_timer.h>
95 #include <netinet/tcp_var.h>
96 #include <netinet/udp.h>
97
98 #include <sys/sysctl.h>
99
100 #include <net/net_osdep.h>
101
102 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");
103
104 static int fw6_debug = 1;
105 #ifdef IPV6FIREWALL_VERBOSE
106 static int fw6_verbose = 1;
107 #else
108 static int fw6_verbose = 0;
109 #endif
110 #ifdef IPV6FIREWALL_VERBOSE_LIMIT
111 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
112 #else
113 static int fw6_verbose_limit = 0;
114 #endif
115
116 LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;
117
118 #ifdef SYSCTL_NODE
119 SYSCTL_DECL(_net_inet6_ip6);
120 SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
121 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, enable, CTLFLAG_RW,
122 &ip6_fw_enable, 0, "Enable ip6fw");
123 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW, &fw6_debug, 0, "");
124 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW, &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 kprintf a; \
131 } while (0)
132 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
133
134 static int add_entry6 (struct ip6_fw_head *chainptr, struct ip6_fw *frwl);
135 static int del_entry6 (struct ip6_fw_head *chainptr, u_short number);
136 static int zero_entry6 (struct mbuf *m);
137 static struct ip6_fw *check_ip6fw_struct (struct ip6_fw *m);
138 static struct ip6_fw *check_ip6fw_mbuf (struct mbuf *fw);
139 static int ip6opts_match (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 (u_short *portptr, int nports, u_short port,
143 int range_flag);
144 static int tcp6flg_match (struct tcphdr *tcp6, struct ip6_fw *f);
145 static int icmp6type_match (struct icmp6_hdr * icmp, struct ip6_fw * f);
146 static void ip6fw_report (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 (struct ip6_hdr **pip6,
150 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m);
151 static int ip6_fw_ctl (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 goto opts_check;
294 case IPPROTO_NONE:
295 opts &= ~IPV6_FW_IP6OPT_NONXT;
296 nopts &= ~IPV6_FW_IP6OPT_NONXT;
297 goto opts_check;
298 case IPPROTO_DSTOPTS:
299 opts &= ~IPV6_FW_IP6OPT_OPTS;
300 nopts &= ~IPV6_FW_IP6OPT_OPTS;
301 break;
302 default:
303 goto opts_check;
304 }
305 *off += (ip6e->ip6e_len + 1) << 3;
306 break;
307 }
308 *nxt = ip6e->ip6e_nxt;
309
310 }
311 opts_check:
312 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */
313 return 1;
314
315 if (opts == 0 && nopts == nopts_sve)
316 return 1;
317 else
318 return 0;
319 }
320
321 static
322 __inline int
323 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
324 {
325 /* Check by name or by IP address */
326 if (byname) {
327 /* Check name */
328 if (ifu->fu_via_if.glob) {
329 if (kfnmatch(ifu->fu_via_if.name, ifp->if_xname, 0)
330 == FNM_NOMATCH)
331 return(0);
332 } else {
333 if (strncmp(ifp->if_xname, ifu->fu_via_if.name,
334 IP6FW_IFNLEN) != 0)
335 return(0);
336 }
337 return(1);
338 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */
339 struct ifaddr_container *ifac;
340
341 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
342 struct ifaddr *ifa = ifac->ifa;
343
344 if (ifa->ifa_addr == NULL)
345 continue;
346 if (ifa->ifa_addr->sa_family != AF_INET6)
347 continue;
348 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
349 &(((struct sockaddr_in6 *)
350 (ifa->ifa_addr))->sin6_addr)))
351 continue;
352 return(1);
353 }
354 return(0);
355 }
356 return(1);
357 }
358
359 static void
360 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
361 struct ifnet *rif, struct ifnet *oif, int off, int nxt)
362 {
363 static int counter;
364 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
365 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
366 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
367 int count;
368 char *action;
369 char action2[32], proto[102], name[18];
370 int len;
371
372 count = f ? f->fw_pcnt : ++counter;
373 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
374 return;
375
376 /* Print command name */
377 ksnprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1);
378
379 action = action2;
380 if (!f)
381 action = "Refuse";
382 else {
383 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
384 case IPV6_FW_F_DENY:
385 action = "Deny";
386 break;
387 case IPV6_FW_F_REJECT:
388 if (f->fw_reject_code == IPV6_FW_REJECT_RST)
389 action = "Reset";
390 else
391 action = "Unreach";
392 break;
393 case IPV6_FW_F_ACCEPT:
394 action = "Accept";
395 break;
396 case IPV6_FW_F_COUNT:
397 action = "Count";
398 break;
399 case IPV6_FW_F_DIVERT:
400 ksnprintf(SNPARGS(action2, 0), "Divert %d",
401 f->fw_divert_port);
402 break;
403 case IPV6_FW_F_TEE:
404 ksnprintf(SNPARGS(action2, 0), "Tee %d",
405 f->fw_divert_port);
406 break;
407 case IPV6_FW_F_SKIPTO:
408 ksnprintf(SNPARGS(action2, 0), "SkipTo %d",
409 f->fw_skipto_rule);
410 break;
411 default:
412 action = "UNKNOWN";
413 break;
414 }
415 }
416
417 switch (nxt) {
418 case IPPROTO_TCP:
419 len = ksnprintf(SNPARGS(proto, 0), "TCP [%s]",
420 ip6_sprintf(&ip6->ip6_src));
421 if (off > 0)
422 len += ksnprintf(SNPARGS(proto, len), ":%d ",
423 ntohs(tcp6->th_sport));
424 else
425 len += ksnprintf(SNPARGS(proto, len), " ");
426 len += ksnprintf(SNPARGS(proto, len), "[%s]",
427 ip6_sprintf(&ip6->ip6_dst));
428 if (off > 0)
429 ksnprintf(SNPARGS(proto, len), ":%d",
430 ntohs(tcp6->th_dport));
431 break;
432 case IPPROTO_UDP:
433 len = ksnprintf(SNPARGS(proto, 0), "UDP [%s]",
434 ip6_sprintf(&ip6->ip6_src));
435 if (off > 0)
436 len += ksnprintf(SNPARGS(proto, len), ":%d ",
437 ntohs(udp->uh_sport));
438 else
439 len += ksnprintf(SNPARGS(proto, len), " ");
440 len += ksnprintf(SNPARGS(proto, len), "[%s]",
441 ip6_sprintf(&ip6->ip6_dst));
442 if (off > 0)
443 ksnprintf(SNPARGS(proto, len), ":%d",
444 ntohs(udp->uh_dport));
445 break;
446 case IPPROTO_ICMPV6:
447 if (off > 0)
448 len = ksnprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ",
449 icmp6->icmp6_type, icmp6->icmp6_code);
450 else
451 len = ksnprintf(SNPARGS(proto, 0), "IPV6-ICMP ");
452 len += ksnprintf(SNPARGS(proto, len), "[%s]",
453 ip6_sprintf(&ip6->ip6_src));
454 ksnprintf(SNPARGS(proto, len), " [%s]",
455 ip6_sprintf(&ip6->ip6_dst));
456 break;
457 default:
458 len = ksnprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt,
459 ip6_sprintf(&ip6->ip6_src));
460 ksnprintf(SNPARGS(proto, len), " [%s]",
461 ip6_sprintf(&ip6->ip6_dst));
462 break;
463 }
464
465 if (oif)
466 log(LOG_SECURITY | LOG_INFO, "%s %s %s out via %s\n",
467 name, action, proto, if_name(oif));
468 else if (rif)
469 log(LOG_SECURITY | LOG_INFO, "%s %s %s in via %s\n",
470 name, action, proto, if_name(rif));
471 else
472 log(LOG_SECURITY | LOG_INFO, "%s %s %s",
473 name, action, proto);
474 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
475 log(LOG_SECURITY | LOG_INFO, "ip6fw: limit reached on entry %d\n",
476 f ? f->fw_number : -1);
477 }
478
479 /*
480 * Parameters:
481 *
482 * ip Pointer to packet header (struct ip6_hdr *)
483 * hlen Packet header length
484 * oif Outgoing interface, or NULL if packet is incoming
485 * #ifndef IP6FW_DIVERT_RESTART
486 * *cookie Ignore all divert/tee rules to this port (if non-zero)
487 * #else
488 * *cookie Skip up to the first rule past this rule number;
489 * #endif
490 * *m The packet; we set to NULL when/if we nuke it.
491 *
492 * Return value:
493 *
494 * 0 The packet is to be accepted and routed normally OR
495 * the packet was denied/rejected and has been dropped;
496 * in the latter case, *m is equal to NULL upon return.
497 * port Divert the packet to port.
498 */
499
500 static int
501 ip6_fw_chk(struct ip6_hdr **pip6,
502 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
503 {
504 struct ip6_fw_chain *chain;
505 struct ip6_fw *rule = NULL;
506 struct ip6_hdr *ip6 = *pip6;
507 struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
508 u_short offset = 0;
509 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
510 u_short src_port, dst_port;
511 #ifdef IP6FW_DIVERT_RESTART
512 u_int16_t skipto = *cookie;
513 #else
514 u_int16_t ignport = ntohs(*cookie);
515 #endif
516
517 *cookie = 0;
518 /*
519 * Go down the chain, looking for enlightment
520 * #ifdef IP6FW_DIVERT_RESTART
521 * If we've been asked to start at a given rule immediatly, do so.
522 * #endif
523 */
524 chain = LIST_FIRST(&ip6_fw_chain);
525 #ifdef IP6FW_DIVERT_RESTART
526 if (skipto) {
527 if (skipto >= 65535)
528 goto dropit;
529 while (chain && (chain->rule->fw_number <= skipto)) {
530 chain = LIST_NEXT(chain, chain);
531 }
532 if (! chain) goto dropit;
533 }
534 #endif /* IP6FW_DIVERT_RESTART */
535 for (; chain; chain = LIST_NEXT(chain, chain)) {
536 struct ip6_fw *const f = chain->rule;
537
538 if (oif) {
539 /* Check direction outbound */
540 if (!(f->fw_flg & IPV6_FW_F_OUT))
541 continue;
542 } else {
543 /* Check direction inbound */
544 if (!(f->fw_flg & IPV6_FW_F_IN))
545 continue;
546 }
547
548 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
549 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
550 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
551 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
552 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))
553
554 /* If src-addr doesn't match, not this rule. */
555 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
556 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
557 continue;
558
559 /* If dest-addr doesn't match, not this rule. */
560 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
561 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
562 continue;
563
564 #undef IN6_ARE_ADDR_MASKEQUAL
565 /* Interface check */
566 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
567 struct ifnet *const iface = oif ? oif : rif;
568
569 /* Backwards compatibility hack for "via" */
570 if (!iface || !iface_match(iface,
571 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
572 continue;
573 } else {
574 /* Check receive interface */
575 if ((f->fw_flg & IPV6_FW_F_IIFACE)
576 && (!rif || !iface_match(rif,
577 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
578 continue;
579 /* Check outgoing interface */
580 if ((f->fw_flg & IPV6_FW_F_OIFACE)
581 && (!oif || !iface_match(oif,
582 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
583 continue;
584 }
585
586 /* Check IP options */
587 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
588 continue;
589
590 /* Fragments */
591 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
592 continue;
593
594 /* Check protocol; if wildcard, match */
595 if (f->fw_prot == IPPROTO_IPV6)
596 goto got_match;
597
598 /* If different, don't match */
599 if (nxt != f->fw_prot)
600 continue;
601
602 #define PULLUP_TO(len) do { \
603 if ((*m)->m_len < (len) \
604 && (*m = m_pullup(*m, (len))) == 0) { \
605 goto dropit; \
606 } \
607 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \
608 } while (0)
609
610 /* Protocol specific checks */
611 switch (nxt) {
612 case IPPROTO_TCP:
613 {
614 struct tcphdr *tcp6;
615
616 if (offset == 1) { /* cf. RFC 1858 */
617 PULLUP_TO(off + 4); /* XXX ? */
618 goto bogusfrag;
619 }
620 if (offset != 0) {
621 /*
622 * TCP flags and ports aren't available in this
623 * packet -- if this rule specified either one,
624 * we consider the rule a non-match.
625 */
626 if (f->fw_nports != 0 ||
627 f->fw_tcpf != f->fw_tcpnf)
628 continue;
629
630 break;
631 }
632 PULLUP_TO(off + 14);
633 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
634 if (((f->fw_tcpf != f->fw_tcpnf) ||
635 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) &&
636 !tcp6flg_match(tcp6, f))
637 continue;
638 src_port = ntohs(tcp6->th_sport);
639 dst_port = ntohs(tcp6->th_dport);
640 goto check_ports;
641 }
642
643 case IPPROTO_UDP:
644 {
645 struct udphdr *udp;
646
647 if (offset != 0) {
648 /*
649 * Port specification is unavailable -- if this
650 * rule specifies a port, we consider the rule
651 * a non-match.
652 */
653 if (f->fw_nports != 0)
654 continue;
655
656 break;
657 }
658 PULLUP_TO(off + 4);
659 udp = (struct udphdr *) ((caddr_t)ip6 + off);
660 src_port = ntohs(udp->uh_sport);
661 dst_port = ntohs(udp->uh_dport);
662 check_ports:
663 if (!port_match6(&f->fw_pts[0],
664 IPV6_FW_GETNSRCP(f), src_port,
665 f->fw_flg & IPV6_FW_F_SRNG))
666 continue;
667 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
668 IPV6_FW_GETNDSTP(f), dst_port,
669 f->fw_flg & IPV6_FW_F_DRNG))
670 continue;
671 break;
672 }
673
674 case IPPROTO_ICMPV6:
675 {
676 struct icmp6_hdr *icmp;
677
678 if (offset != 0) /* Type isn't valid */
679 break;
680 PULLUP_TO(off + 2);
681 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
682 if (!icmp6type_match(icmp, f))
683 continue;
684 break;
685 }
686 #undef PULLUP_TO
687
688 bogusfrag:
689 if (fw6_verbose)
690 ip6fw_report(NULL, ip6, rif, oif, off, nxt);
691 goto dropit;
692 }
693
694 got_match:
695 #ifndef IP6FW_DIVERT_RESTART
696 /* Ignore divert/tee rule if socket port is "ignport" */
697 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
698 case IPV6_FW_F_DIVERT:
699 case IPV6_FW_F_TEE:
700 if (f->fw_divert_port == ignport)
701 continue; /* ignore this rule */
702 break;
703 }
704
705 #endif /* IP6FW_DIVERT_RESTART */
706 /* Update statistics */
707 f->fw_pcnt += 1;
708 f->fw_bcnt += ntohs(ip6->ip6_plen);
709 f->timestamp = time_second;
710
711 /* Log to console if desired */
712 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
713 ip6fw_report(f, ip6, rif, oif, off, nxt);
714
715 /* Take appropriate action */
716 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
717 case IPV6_FW_F_ACCEPT:
718 return(0);
719 case IPV6_FW_F_COUNT:
720 continue;
721 case IPV6_FW_F_DIVERT:
722 #ifdef IP6FW_DIVERT_RESTART
723 *cookie = f->fw_number;
724 #else
725 *cookie = htons(f->fw_divert_port);
726 #endif /* IP6FW_DIVERT_RESTART */
727 return(f->fw_divert_port);
728 case IPV6_FW_F_TEE:
729 /*
730 * XXX someday tee packet here, but beware that you
731 * can't use m_copym() or m_copypacket() because
732 * the divert input routine modifies the mbuf
733 * (and these routines only increment reference
734 * counts in the case of mbuf clusters), so need
735 * to write custom routine.
736 */
737 continue;
738 case IPV6_FW_F_SKIPTO:
739 #ifdef DIAGNOSTIC
740 while (chain->chain.le_next
741 && chain->chain.le_next->rule->fw_number
742 < f->fw_skipto_rule)
743 #else
744 while (chain->chain.le_next->rule->fw_number
745 < f->fw_skipto_rule)
746 #endif
747 chain = chain->chain.le_next;
748 continue;
749 }
750
751 /* Deny/reject this packet using this rule */
752 rule = f;
753 break;
754 }
755
756 #ifdef DIAGNOSTIC
757 /* Rule 65535 should always be there and should always match */
758 if (!chain)
759 panic("ip6_fw: chain");
760 #endif
761
762 /*
763 * At this point, we're going to drop the packet.
764 * Send a reject notice if all of the following are true:
765 *
766 * - The packet matched a reject rule
767 * - The packet is not an ICMP packet, or is an ICMP query packet
768 * - The packet is not a multicast or broadcast packet
769 */
770 if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
771 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
772 && !((*m)->m_flags & (M_BCAST|M_MCAST))
773 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
774 switch (rule->fw_reject_code) {
775 case IPV6_FW_REJECT_RST:
776 {
777 struct tcphdr *const tcp =
778 (struct tcphdr *) ((caddr_t)ip6 + off);
779 struct {
780 struct ip6_hdr ip6;
781 struct tcphdr th;
782 } ti;
783 tcp_seq ack, seq;
784 int flags;
785
786 if (offset != 0 || (tcp->th_flags & TH_RST))
787 break;
788
789 ti.ip6 = *ip6;
790 ti.th = *tcp;
791 ti.th.th_seq = ntohl(ti.th.th_seq);
792 ti.th.th_ack = ntohl(ti.th.th_ack);
793 ti.ip6.ip6_nxt = IPPROTO_TCP;
794 if (ti.th.th_flags & TH_ACK) {
795 ack = 0;
796 seq = ti.th.th_ack;
797 flags = TH_RST;
798 } else {
799 ack = ti.th.th_seq;
800 if (((*m)->m_flags & M_PKTHDR) != 0) {
801 ack += (*m)->m_pkthdr.len - off
802 - (ti.th.th_off << 2);
803 } else if (ip6->ip6_plen) {
804 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
805 - off - (ti.th.th_off << 2);
806 } else {
807 m_freem(*m);
808 *m = 0;
809 break;
810 }
811 seq = 0;
812 flags = TH_RST|TH_ACK;
813 }
814 bcopy(&ti, ip6, sizeof(ti));
815 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1),
816 *m, ack, seq, flags);
817 *m = NULL;
818 break;
819 }
820 default: /* Send an ICMP unreachable using code */
821 if (oif)
822 (*m)->m_pkthdr.rcvif = oif;
823 icmp6_error(*m, ICMP6_DST_UNREACH,
824 rule->fw_reject_code, 0);
825 *m = NULL;
826 break;
827 }
828 }
829
830 dropit:
831 /*
832 * Finally, drop the packet.
833 */
834 if (*m) {
835 m_freem(*m);
836 *m = NULL;
837 }
838 return(0);
839 }
840
841 static int
842 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
843 {
844 struct ip6_fw *ftmp = 0;
845 struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
846 u_short nbr = 0;
847
848 fwc = kmalloc(sizeof *fwc, M_IP6FW, M_INTWAIT);
849 ftmp = kmalloc(sizeof *ftmp, M_IP6FW, M_INTWAIT);
850
851 bcopy(frwl, ftmp, sizeof(struct ip6_fw));
852 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
853 ftmp->fw_pcnt = 0L;
854 ftmp->fw_bcnt = 0L;
855 fwc->rule = ftmp;
856
857 crit_enter();
858
859 if (!chainptr->lh_first) {
860 LIST_INSERT_HEAD(chainptr, fwc, chain);
861 crit_exit();
862 return(0);
863 } else if (ftmp->fw_number == (u_short)-1) {
864 if (fwc) kfree(fwc, M_IP6FW);
865 if (ftmp) kfree(ftmp, M_IP6FW);
866 crit_exit();
867 dprintf(("%s bad rule number\n", err_prefix));
868 return (EINVAL);
869 }
870
871 /* If entry number is 0, find highest numbered rule and add 100 */
872 if (ftmp->fw_number == 0) {
873 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
874 if (fcp->rule->fw_number != (u_short)-1)
875 nbr = fcp->rule->fw_number;
876 else
877 break;
878 }
879 if (nbr < (u_short)-1 - 100)
880 nbr += 100;
881 ftmp->fw_number = nbr;
882 }
883
884 /* Got a valid number; now insert it, keeping the list ordered */
885 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
886 if (fcp->rule->fw_number > ftmp->fw_number) {
887 if (fcpl) {
888 LIST_INSERT_AFTER(fcpl, fwc, chain);
889 } else {
890 LIST_INSERT_HEAD(chainptr, fwc, chain);
891 }
892 break;
893 } else {
894 fcpl = fcp;
895 }
896 }
897
898 crit_exit();
899 return (0);
900 }
901
902 static int
903 del_entry6(struct ip6_fw_head *chainptr, u_short number)
904 {
905 struct ip6_fw_chain *fcp;
906
907 crit_enter();
908
909 fcp = chainptr->lh_first;
910 if (number != (u_short)-1) {
911 for (; fcp; fcp = fcp->chain.le_next) {
912 if (fcp->rule->fw_number == number) {
913 LIST_REMOVE(fcp, chain);
914 crit_exit();
915 kfree(fcp->rule, M_IP6FW);
916 kfree(fcp, M_IP6FW);
917 return 0;
918 }
919 }
920 }
921
922 crit_exit();
923 return (EINVAL);
924 }
925
926 static int
927 zero_entry6(struct mbuf *m)
928 {
929 struct ip6_fw *frwl;
930 struct ip6_fw_chain *fcp;
931
932 if (m && m->m_len != 0) {
933 if (m->m_len != sizeof(struct ip6_fw))
934 return(EINVAL);
935 frwl = mtod(m, struct ip6_fw *);
936 }
937 else
938 frwl = NULL;
939
940 /*
941 * It's possible to insert multiple chain entries with the
942 * same number, so we don't stop after finding the first
943 * match if zeroing a specific entry.
944 */
945 crit_enter();
946 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
947 if (!frwl || frwl->fw_number == fcp->rule->fw_number) {
948 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
949 fcp->rule->timestamp = 0;
950 }
951 crit_exit();
952
953 if (fw6_verbose) {
954 if (frwl)
955 log(LOG_SECURITY | LOG_NOTICE,
956 "ip6fw: Entry %d cleared.\n", frwl->fw_number);
957 else
958 log(LOG_SECURITY | LOG_NOTICE,
959 "ip6fw: Accounting cleared.\n");
960 }
961
962 return(0);
963 }
964
965 static struct ip6_fw *
966 check_ip6fw_mbuf(struct mbuf *m)
967 {
968 /* Check length */
969 if (m->m_len != sizeof(struct ip6_fw)) {
970 dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
971 sizeof(struct ip6_fw)));
972 return (NULL);
973 }
974 return(check_ip6fw_struct(mtod(m, struct ip6_fw *)));
975 }
976
977 static struct ip6_fw *
978 check_ip6fw_struct(struct ip6_fw *frwl)
979 {
980 /* Check for invalid flag bits */
981 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
982 dprintf(("%s undefined flag bits set (flags=%x)\n",
983 err_prefix, frwl->fw_flg));
984 return (NULL);
985 }
986 /* Must apply to incoming or outgoing (or both) */
987 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
988 dprintf(("%s neither in nor out\n", err_prefix));
989 return (NULL);
990 }
991 /* Empty interface name is no good */
992 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
993 && !*frwl->fw_in_if.fu_via_if.name)
994 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
995 && !*frwl->fw_out_if.fu_via_if.name)) {
996 dprintf(("%s empty interface name\n", err_prefix));
997 return (NULL);
998 }
999 /* Sanity check interface matching */
1000 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
1001 ; /* allow "via" backwards compatibility */
1002 } else if ((frwl->fw_flg & IPV6_FW_F_IN)
1003 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
1004 dprintf(("%s outgoing interface check on incoming\n",
1005 err_prefix));
1006 return (NULL);
1007 }
1008 /* Sanity check port ranges */
1009 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
1010 dprintf(("%s src range set but n_src_p=%d\n",
1011 err_prefix, IPV6_FW_GETNSRCP(frwl)));
1012 return (NULL);
1013 }
1014 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
1015 dprintf(("%s dst range set but n_dst_p=%d\n",
1016 err_prefix, IPV6_FW_GETNDSTP(frwl)));
1017 return (NULL);
1018 }
1019 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
1020 dprintf(("%s too many ports (%d+%d)\n",
1021 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
1022 return (NULL);
1023 }
1024 /*
1025 * Protocols other than TCP/UDP don't use port range
1026 */
1027 if ((frwl->fw_prot != IPPROTO_TCP) &&
1028 (frwl->fw_prot != IPPROTO_UDP) &&
1029 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
1030 dprintf(("%s port(s) specified for non TCP/UDP rule\n",
1031 err_prefix));
1032 return(NULL);
1033 }
1034
1035 /*
1036 * Rather than modify the entry to make such entries work,
1037 * we reject this rule and require user level utilities
1038 * to enforce whatever policy they deem appropriate.
1039 */
1040 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
1041 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
1042 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
1043 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
1044 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
1045 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
1046 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
1047 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
1048 dprintf(("%s rule never matches\n", err_prefix));
1049 return(NULL);
1050 }
1051
1052 if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
1053 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
1054 if (frwl->fw_nports) {
1055 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
1056 return(NULL);
1057 }
1058 if (frwl->fw_prot == IPPROTO_TCP &&
1059 frwl->fw_tcpf != frwl->fw_tcpnf) {
1060 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
1061 return(NULL);
1062 }
1063 }
1064
1065 /* Check command specific stuff */
1066 switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
1067 {
1068 case IPV6_FW_F_REJECT:
1069 if (frwl->fw_reject_code >= 0x100
1070 && !(frwl->fw_prot == IPPROTO_TCP
1071 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
1072 dprintf(("%s unknown reject code\n", err_prefix));
1073 return(NULL);
1074 }
1075 break;
1076 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */
1077 case IPV6_FW_F_TEE:
1078 if (frwl->fw_divert_port == 0) {
1079 dprintf(("%s can't divert to port 0\n", err_prefix));
1080 return (NULL);
1081 }
1082 break;
1083 case IPV6_FW_F_DENY:
1084 case IPV6_FW_F_ACCEPT:
1085 case IPV6_FW_F_COUNT:
1086 case IPV6_FW_F_SKIPTO:
1087 break;
1088 default:
1089 dprintf(("%s invalid command\n", err_prefix));
1090 return(NULL);
1091 }
1092
1093 return frwl;
1094 }
1095
1096 static int
1097 ip6_fw_ctl(int stage, struct mbuf **mm)
1098 {
1099 int error;
1100 struct mbuf *m;
1101
1102 if (stage == IPV6_FW_GET) {
1103 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1104 *mm = m = m_get(MB_WAIT, MT_DATA); /* XXX */
1105 if (!m)
1106 return(ENOBUFS);
1107 if (sizeof *(fcp->rule) > MLEN) {
1108 MCLGET(m, MB_WAIT);
1109 if ((m->m_flags & M_EXT) == 0) {
1110 m_free(m);
1111 return(ENOBUFS);
1112 }
1113 }
1114 for (; fcp; fcp = fcp->chain.le_next) {
1115 bcopy(fcp->rule, m->m_data, sizeof *(fcp->rule));
1116 m->m_len = sizeof *(fcp->rule);
1117 m->m_next = m_get(MB_WAIT, MT_DATA); /* XXX */
1118 if (!m->m_next) {
1119 m_freem(*mm);
1120 return(ENOBUFS);
1121 }
1122 m = m->m_next;
1123 if (sizeof *(fcp->rule) > MLEN) {
1124 MCLGET(m, MB_WAIT);
1125 if ((m->m_flags & M_EXT) == 0) {
1126 m_freem(*mm);
1127 return(ENOBUFS);
1128 }
1129 }
1130 m->m_len = 0;
1131 }
1132 return (0);
1133 }
1134 m = *mm;
1135 /* only allow get calls if secure mode > 2 */
1136 if (securelevel > 2) {
1137 if (m) {
1138 m_freem(m);
1139 *mm = 0;
1140 }
1141 return(EPERM);
1142 }
1143 if (stage == IPV6_FW_FLUSH) {
1144 while (ip6_fw_chain.lh_first != NULL &&
1145 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) {
1146 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1147 crit_enter();
1148 LIST_REMOVE(ip6_fw_chain.lh_first, chain);
1149 crit_exit();
1150 kfree(fcp->rule, M_IP6FW);
1151 kfree(fcp, M_IP6FW);
1152 }
1153 if (m) {
1154 m_freem(m);
1155 *mm = 0;
1156 }
1157 return (0);
1158 }
1159 if (stage == IPV6_FW_ZERO) {
1160 error = zero_entry6(m);
1161 if (m) {
1162 m_freem(m);
1163 *mm = 0;
1164 }
1165 return (error);
1166 }
1167 if (m == NULL) {
1168 kprintf("%s NULL mbuf ptr\n", err_prefix);
1169 return (EINVAL);
1170 }
1171
1172 if (stage == IPV6_FW_ADD) {
1173 struct ip6_fw *frwl = check_ip6fw_mbuf(m);
1174
1175 if (!frwl)
1176 error = EINVAL;
1177 else
1178 error = add_entry6(&ip6_fw_chain, frwl);
1179 if (m) {
1180 m_freem(m);
1181 *mm = 0;
1182 }
1183 return error;
1184 }
1185 if (stage == IPV6_FW_DEL) {
1186 if (m->m_len != sizeof(struct ip6_fw)) {
1187 dprintf(("%s len=%d, want %d\n", err_prefix, m->m_len,
1188 sizeof(struct ip6_fw)));
1189 error = EINVAL;
1190 } else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) {
1191 dprintf(("%s can't delete rule 65535\n", err_prefix));
1192 error = EINVAL;
1193 } else
1194 error = del_entry6(&ip6_fw_chain,
1195 mtod(m, struct ip6_fw *)->fw_number);
1196 if (m) {
1197 m_freem(m);
1198 *mm = 0;
1199 }
1200 return error;
1201 }
1202
1203 dprintf(("%s unknown request %d\n", err_prefix, stage));
1204 if (m) {
1205 m_freem(m);
1206 *mm = 0;
1207 }
1208 return (EINVAL);
1209 }
1210
1211 void
1212 ip6_fw_init(void)
1213 {
1214 struct ip6_fw default_rule;
1215
1216 ip6_fw_chk_ptr = ip6_fw_chk;
1217 ip6_fw_ctl_ptr = ip6_fw_ctl;
1218 LIST_INIT(&ip6_fw_chain);
1219
1220 bzero(&default_rule, sizeof default_rule);
1221 default_rule.fw_prot = IPPROTO_IPV6;
1222 default_rule.fw_number = (u_short)-1;
1223 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1224 default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
1225 #else
1226 default_rule.fw_flg |= IPV6_FW_F_DENY;
1227 #endif
1228 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
1229 if (check_ip6fw_struct(&default_rule) == NULL ||
1230 add_entry6(&ip6_fw_chain, &default_rule))
1231 panic(__func__);
1232
1233 kprintf("IPv6 packet filtering initialized, ");
1234 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1235 kprintf("default to accept, ");
1236 #endif
1237 #ifndef IPV6FIREWALL_VERBOSE
1238 kprintf("logging disabled\n");
1239 #else
1240 if (fw6_verbose_limit == 0)
1241 kprintf("unlimited logging\n");
1242 else
1243 kprintf("logging limited to %d packets/entry\n",
1244 fw6_verbose_limit);
1245 #endif
1246 }
1247
1248 static ip6_fw_chk_t *old_chk_ptr;
1249 static ip6_fw_ctl_t *old_ctl_ptr;
1250
1251 static int
1252 ip6fw_modevent(module_t mod, int type, void *unused)
1253 {
1254 switch (type) {
1255 case MOD_LOAD:
1256 crit_enter();
1257
1258 old_chk_ptr = ip6_fw_chk_ptr;
1259 old_ctl_ptr = ip6_fw_ctl_ptr;
1260
1261 ip6_fw_init();
1262 crit_exit();
1263 return 0;
1264 case MOD_UNLOAD:
1265 crit_enter();
1266 ip6_fw_chk_ptr = old_chk_ptr;
1267 ip6_fw_ctl_ptr = old_ctl_ptr;
1268 while (LIST_FIRST(&ip6_fw_chain) != NULL) {
1269 struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain);
1270 LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain);
1271 kfree(fcp->rule, M_IP6FW);
1272 kfree(fcp, M_IP6FW);
1273 }
1274
1275 crit_exit();
1276 kprintf("IPv6 firewall unloaded\n");
1277 return 0;
1278 default:
1279 break;
1280 }
1281 return 0;
1282 }
1283
1284 static moduledata_t ip6fwmod = {
1285 "ip6fw",
1286 ip6fw_modevent,
1287 0
1288 };
1289 DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
DragonFly BSD