FreeBSD/Linux Kernel Cross Reference
sys/netinet6/ip6_fw.c
1 /* $FreeBSD$ */
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/module.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74 #include <sys/syslog.h>
75 #include <sys/time.h>
76 #include <net/if.h>
77 #include <net/route.h>
78 #include <netinet/in_systm.h>
79 #include <netinet/in.h>
80 #include <netinet/ip.h>
81
82 #include <netinet/ip6.h>
83 #include <netinet6/ip6_var.h>
84 #include <netinet6/in6_var.h>
85 #include <netinet/icmp6.h>
86
87 #include <netinet/in_pcb.h>
88
89 #include <netinet6/ip6_fw.h>
90 #include <netinet/ip_var.h>
91 #include <netinet/tcp.h>
92 #include <netinet/tcp_seq.h>
93 #include <netinet/tcp_timer.h>
94 #include <netinet/tcp_var.h>
95 #include <netinet/udp.h>
96
97 #include <sys/sysctl.h>
98
99 #include <net/net_osdep.h>
100
101 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");
102
103 static int fw6_debug = 1;
104 #ifdef IPV6FIREWALL_VERBOSE
105 static int fw6_verbose = 1;
106 #else
107 static int fw6_verbose = 0;
108 #endif
109 #ifdef IPV6FIREWALL_VERBOSE_LIMIT
110 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
111 #else
112 static int fw6_verbose_limit = 0;
113 #endif
114
115 static LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;
116
117 SYSCTL_DECL(_net_inet6_ip6);
118 static struct sysctl_ctx_list ip6_fw_sysctl_ctx;
119 static struct sysctl_oid *ip6_fw_sysctl_tree;
120
121 #define dprintf(a) do { \
122 if (fw6_debug) \
123 printf a; \
124 } while (/*CONSTCOND*/ 0)
125 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
126
127 static int add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl));
128 static int del_entry6 __P((struct ip6_fw_head *chainptr, u_short number));
129 static int zero_entry6 __P((struct mbuf *m));
130 static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m));
131 static struct ip6_fw *check_ip6fw_mbuf __P((struct mbuf *fw));
132 static int ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f,
133 struct mbuf **m,
134 int *off, int *nxt, u_short *offset));
135 static int port_match6 __P((u_short *portptr, int nports, u_short port,
136 int range_flag));
137 static int tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f));
138 static int icmp6type_match __P((struct icmp6_hdr * icmp, struct ip6_fw * f));
139 static void ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6,
140 struct ifnet *rif, struct ifnet *oif, int off, int nxt));
141
142 static int ip6_fw_chk __P((struct ip6_hdr **pip6,
143 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m));
144 static int ip6_fw_ctl __P((int stage, struct mbuf **mm));
145
146 static char err_prefix[] = "ip6_fw_ctl:";
147
148 /*
149 * Returns 1 if the port is matched by the vector, 0 otherwise
150 */
151 static
152 __inline
153 int
154 port_match6(u_short *portptr, int nports, u_short port, int range_flag)
155 {
156 if (!nports)
157 return 1;
158 if (range_flag) {
159 if (portptr[0] <= port && port <= portptr[1]) {
160 return 1;
161 }
162 nports -= 2;
163 portptr += 2;
164 }
165 while (nports-- > 0) {
166 if (*portptr++ == port) {
167 return 1;
168 }
169 }
170 return 0;
171 }
172
173 static int
174 tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f)
175 {
176 u_char flg_set, flg_clr;
177
178 /*
179 * If an established connection is required, reject packets that
180 * have only SYN of RST|ACK|SYN set. Otherwise, fall through to
181 * other flag requirements.
182 */
183 if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) &&
184 ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK |
185 IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN))
186 return 0;
187
188 flg_set = tcp6->th_flags & f->fw_tcpf;
189 flg_clr = tcp6->th_flags & f->fw_tcpnf;
190
191 if (flg_set != f->fw_tcpf)
192 return 0;
193 if (flg_clr)
194 return 0;
195
196 return 1;
197 }
198
199 static int
200 icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f)
201 {
202 int type;
203
204 if (!(f->fw_flg & IPV6_FW_F_ICMPBIT))
205 return (1);
206
207 type = icmp6->icmp6_type;
208
209 /* check for matching type in the bitmap */
210 if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 &&
211 (f->fw_icmp6types[type / (sizeof(unsigned) * 8)] &
212 (1U << (type % (8 * sizeof(unsigned))))))
213 return (1);
214
215 return (0); /* no match */
216 }
217
218 static int
219 is_icmp6_query(struct ip6_hdr *ip6, int off)
220 {
221 const struct icmp6_hdr *icmp6;
222 int icmp6_type;
223
224 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
225 icmp6_type = icmp6->icmp6_type;
226
227 if (icmp6_type == ICMP6_ECHO_REQUEST ||
228 icmp6_type == ICMP6_MEMBERSHIP_QUERY ||
229 icmp6_type == ICMP6_WRUREQUEST ||
230 icmp6_type == ICMP6_FQDN_QUERY ||
231 icmp6_type == ICMP6_NI_QUERY)
232 return (1);
233
234 return (0);
235 }
236
237 static int
238 ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m,
239 int *off, int *nxt, u_short *offset)
240 {
241 int len;
242 struct ip6_hdr *ip6 = *pip6;
243 struct ip6_ext *ip6e;
244 u_char opts, nopts, nopts_sve;
245
246 opts = f->fw_ip6opt;
247 nopts = nopts_sve = f->fw_ip6nopt;
248
249 *nxt = ip6->ip6_nxt;
250 *off = sizeof(struct ip6_hdr);
251 len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
252 while (*off < len) {
253 ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off);
254 if ((*m)->m_len < *off + sizeof(*ip6e))
255 goto opts_check; /* XXX */
256
257 switch (*nxt) {
258 case IPPROTO_FRAGMENT:
259 if ((*m)->m_len >= *off + sizeof(struct ip6_frag)) {
260 struct ip6_frag *ip6f;
261
262 ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off);
263 *offset = ip6f->ip6f_offlg & IP6F_OFF_MASK;
264 }
265 opts &= ~IPV6_FW_IP6OPT_FRAG;
266 nopts &= ~IPV6_FW_IP6OPT_FRAG;
267 *off += sizeof(struct ip6_frag);
268 break;
269 case IPPROTO_AH:
270 opts &= ~IPV6_FW_IP6OPT_AH;
271 nopts &= ~IPV6_FW_IP6OPT_AH;
272 *off += (ip6e->ip6e_len + 2) << 2;
273 break;
274 default:
275 switch (*nxt) {
276 case IPPROTO_HOPOPTS:
277 opts &= ~IPV6_FW_IP6OPT_HOPOPT;
278 nopts &= ~IPV6_FW_IP6OPT_HOPOPT;
279 break;
280 case IPPROTO_ROUTING:
281 opts &= ~IPV6_FW_IP6OPT_ROUTE;
282 nopts &= ~IPV6_FW_IP6OPT_ROUTE;
283 break;
284 case IPPROTO_ESP:
285 opts &= ~IPV6_FW_IP6OPT_ESP;
286 nopts &= ~IPV6_FW_IP6OPT_ESP;
287 goto opts_check;
288 case IPPROTO_NONE:
289 opts &= ~IPV6_FW_IP6OPT_NONXT;
290 nopts &= ~IPV6_FW_IP6OPT_NONXT;
291 goto opts_check;
292 case IPPROTO_DSTOPTS:
293 opts &= ~IPV6_FW_IP6OPT_OPTS;
294 nopts &= ~IPV6_FW_IP6OPT_OPTS;
295 break;
296 default:
297 goto opts_check;
298 }
299 *off += (ip6e->ip6e_len + 1) << 3;
300 break;
301 }
302 *nxt = ip6e->ip6e_nxt;
303
304 }
305 opts_check:
306 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */
307 return 1;
308
309 if (opts == 0 && nopts == nopts_sve)
310 return 1;
311 else
312 return 0;
313 }
314
315 static
316 __inline
317 int
318 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
319 {
320 /* Check by name or by IP address */
321 if (byname) {
322 /* Check name */
323 if (ifu->fu_via_if.glob) {
324 if (fnmatch(ifu->fu_via_if.name, ifp->if_xname, 0)
325 == FNM_NOMATCH)
326 return(0);
327 } else {
328 if (strncmp(ifp->if_xname, ifu->fu_via_if.name,
329 IP6FW_IFNLEN) != 0)
330 return(0);
331 }
332 return(1);
333 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */
334 struct ifaddr *ia;
335
336 for (ia = ifp->if_addrlist.tqh_first; ia; ia = ia->ifa_list.tqe_next) {
337
338 if (ia->ifa_addr == NULL)
339 continue;
340 if (ia->ifa_addr->sa_family != AF_INET6)
341 continue;
342 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
343 &(((struct sockaddr_in6 *)
344 (ia->ifa_addr))->sin6_addr)))
345 continue;
346 return (1);
347 }
348 return (0);
349 }
350 return (1);
351 }
352
353 static void
354 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
355 struct ifnet *rif, struct ifnet *oif, int off, int nxt)
356 {
357 static int counter;
358 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
359 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
360 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
361 int count;
362 char *action;
363 char action2[32], proto[102], name[18];
364 int len;
365
366 count = f ? f->fw_pcnt : ++counter;
367 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
368 return;
369
370 /* Print command name */
371 snprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1);
372
373 action = action2;
374 if (!f)
375 action = "Refuse";
376 else {
377 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
378 case IPV6_FW_F_DENY:
379 action = "Deny";
380 break;
381 case IPV6_FW_F_REJECT:
382 if (f->fw_reject_code == IPV6_FW_REJECT_RST)
383 action = "Reset";
384 else
385 action = "Unreach";
386 break;
387 case IPV6_FW_F_ACCEPT:
388 action = "Accept";
389 break;
390 case IPV6_FW_F_COUNT:
391 action = "Count";
392 break;
393 case IPV6_FW_F_DIVERT:
394 snprintf(SNPARGS(action2, 0), "Divert %d",
395 f->fw_divert_port);
396 break;
397 case IPV6_FW_F_TEE:
398 snprintf(SNPARGS(action2, 0), "Tee %d",
399 f->fw_divert_port);
400 break;
401 case IPV6_FW_F_SKIPTO:
402 snprintf(SNPARGS(action2, 0), "SkipTo %d",
403 f->fw_skipto_rule);
404 break;
405 default:
406 action = "UNKNOWN";
407 break;
408 }
409 }
410
411 switch (nxt) {
412 case IPPROTO_TCP:
413 len = snprintf(SNPARGS(proto, 0), "TCP [%s]",
414 ip6_sprintf(&ip6->ip6_src));
415 if (off > 0)
416 len += snprintf(SNPARGS(proto, len), ":%d ",
417 ntohs(tcp6->th_sport));
418 else
419 len += snprintf(SNPARGS(proto, len), " ");
420 len += snprintf(SNPARGS(proto, len), "[%s]",
421 ip6_sprintf(&ip6->ip6_dst));
422 if (off > 0)
423 snprintf(SNPARGS(proto, len), ":%d",
424 ntohs(tcp6->th_dport));
425 break;
426 case IPPROTO_UDP:
427 len = snprintf(SNPARGS(proto, 0), "UDP [%s]",
428 ip6_sprintf(&ip6->ip6_src));
429 if (off > 0)
430 len += snprintf(SNPARGS(proto, len), ":%d ",
431 ntohs(udp->uh_sport));
432 else
433 len += snprintf(SNPARGS(proto, len), " ");
434 len += snprintf(SNPARGS(proto, len), "[%s]",
435 ip6_sprintf(&ip6->ip6_dst));
436 if (off > 0)
437 snprintf(SNPARGS(proto, len), ":%d",
438 ntohs(udp->uh_dport));
439 break;
440 case IPPROTO_ICMPV6:
441 if (off > 0)
442 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ",
443 icmp6->icmp6_type, icmp6->icmp6_code);
444 else
445 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP ");
446 len += snprintf(SNPARGS(proto, len), "[%s]",
447 ip6_sprintf(&ip6->ip6_src));
448 snprintf(SNPARGS(proto, len), " [%s]",
449 ip6_sprintf(&ip6->ip6_dst));
450 break;
451 default:
452 len = snprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt,
453 ip6_sprintf(&ip6->ip6_src));
454 snprintf(SNPARGS(proto, len), " [%s]",
455 ip6_sprintf(&ip6->ip6_dst));
456 break;
457 }
458
459 if (oif)
460 log(LOG_SECURITY | LOG_INFO, "%s %s %s out via %s\n",
461 name, action, proto, if_name(oif));
462 else if (rif)
463 log(LOG_SECURITY | LOG_INFO, "%s %s %s in via %s\n",
464 name, action, proto, if_name(rif));
465 else
466 log(LOG_SECURITY | LOG_INFO, "%s %s %s",
467 name, action, proto);
468 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
469 log(LOG_SECURITY | LOG_INFO, "ip6fw: limit reached on entry %d\n",
470 f ? f->fw_number : -1);
471 }
472
473 /*
474 * Parameters:
475 *
476 * ip Pointer to packet header (struct ip6_hdr *)
477 * hlen Packet header length
478 * oif Outgoing interface, or NULL if packet is incoming
479 * #ifndef IP6FW_DIVERT_RESTART
480 * *cookie Ignore all divert/tee rules to this port (if non-zero)
481 * #else
482 * *cookie Skip up to the first rule past this rule number;
483 * #endif
484 * *m The packet; we set to NULL when/if we nuke it.
485 *
486 * Return value:
487 *
488 * 0 The packet is to be accepted and routed normally OR
489 * the packet was denied/rejected and has been dropped;
490 * in the latter case, *m is equal to NULL upon return.
491 * port Divert the packet to port.
492 */
493
494 static int
495 ip6_fw_chk(struct ip6_hdr **pip6,
496 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
497 {
498 struct ip6_fw_chain *chain;
499 struct ip6_fw *rule = NULL;
500 struct ip6_hdr *ip6 = *pip6;
501 struct ifnet *const rif = (*m)->m_pkthdr.rcvif;
502 u_short offset = 0;
503 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
504 u_short src_port, dst_port;
505 #ifdef IP6FW_DIVERT_RESTART
506 u_int16_t skipto = *cookie;
507 #else
508 u_int16_t ignport = ntohs(*cookie);
509 #endif
510
511 *cookie = 0;
512 /*
513 * Go down the chain, looking for enlightment
514 * #ifdef IP6FW_DIVERT_RESTART
515 * If we've been asked to start at a given rule immediatly, do so.
516 * #endif
517 */
518 chain = LIST_FIRST(&ip6_fw_chain);
519 #ifdef IP6FW_DIVERT_RESTART
520 if (skipto) {
521 if (skipto >= 65535)
522 goto dropit;
523 while (chain && (chain->rule->fw_number <= skipto)) {
524 chain = LIST_NEXT(chain, chain);
525 }
526 if (! chain) goto dropit;
527 }
528 #endif /* IP6FW_DIVERT_RESTART */
529 for (; chain; chain = LIST_NEXT(chain, chain)) {
530 struct ip6_fw *const f = chain->rule;
531
532 if (oif) {
533 /* Check direction outbound */
534 if (!(f->fw_flg & IPV6_FW_F_OUT))
535 continue;
536 } else {
537 /* Check direction inbound */
538 if (!(f->fw_flg & IPV6_FW_F_IN))
539 continue;
540 }
541
542 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
543 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
544 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
545 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
546 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))
547
548 /* If src-addr doesn't match, not this rule. */
549 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
550 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
551 continue;
552
553 /* If dest-addr doesn't match, not this rule. */
554 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
555 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
556 continue;
557
558 #undef IN6_ARE_ADDR_MASKEQUAL
559 /* Interface check */
560 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
561 struct ifnet *const iface = oif ? oif : rif;
562
563 /* Backwards compatibility hack for "via" */
564 if (!iface || !iface_match(iface,
565 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
566 continue;
567 } else {
568 /* Check receive interface */
569 if ((f->fw_flg & IPV6_FW_F_IIFACE)
570 && (!rif || !iface_match(rif,
571 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
572 continue;
573 /* Check outgoing interface */
574 if ((f->fw_flg & IPV6_FW_F_OIFACE)
575 && (!oif || !iface_match(oif,
576 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
577 continue;
578 }
579
580 /* Check IP options */
581 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
582 continue;
583
584 /* Fragments */
585 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
586 continue;
587
588 /* Check protocol; if wildcard, match */
589 if (f->fw_prot == IPPROTO_IPV6)
590 goto got_match;
591
592 /* If different, don't match */
593 if (nxt != f->fw_prot)
594 continue;
595
596 #define PULLUP_TO(len) do { \
597 if ((*m)->m_len < (len) \
598 && (*m = m_pullup(*m, (len))) == 0) { \
599 goto dropit; \
600 } \
601 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \
602 } while (/*CONSTCOND*/ 0)
603
604 /* Protocol specific checks */
605 switch (nxt) {
606 case IPPROTO_TCP:
607 {
608 struct tcphdr *tcp6;
609
610 if (offset == 1) { /* cf. RFC 1858 */
611 PULLUP_TO(off + 4); /* XXX ? */
612 goto bogusfrag;
613 }
614 if (offset != 0) {
615 /*
616 * TCP flags and ports aren't available in this
617 * packet -- if this rule specified either one,
618 * we consider the rule a non-match.
619 */
620 if (f->fw_nports != 0 ||
621 f->fw_tcpf != f->fw_tcpnf)
622 continue;
623
624 break;
625 }
626 PULLUP_TO(off + 14);
627 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
628 if (((f->fw_tcpf != f->fw_tcpnf) ||
629 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) &&
630 !tcp6flg_match(tcp6, f))
631 continue;
632 src_port = ntohs(tcp6->th_sport);
633 dst_port = ntohs(tcp6->th_dport);
634 goto check_ports;
635 }
636
637 case IPPROTO_UDP:
638 {
639 struct udphdr *udp;
640
641 if (offset != 0) {
642 /*
643 * Port specification is unavailable -- if this
644 * rule specifies a port, we consider the rule
645 * a non-match.
646 */
647 if (f->fw_nports != 0)
648 continue;
649
650 break;
651 }
652 PULLUP_TO(off + 4);
653 udp = (struct udphdr *) ((caddr_t)ip6 + off);
654 src_port = ntohs(udp->uh_sport);
655 dst_port = ntohs(udp->uh_dport);
656 check_ports:
657 if (!port_match6(&f->fw_pts[0],
658 IPV6_FW_GETNSRCP(f), src_port,
659 f->fw_flg & IPV6_FW_F_SRNG))
660 continue;
661 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
662 IPV6_FW_GETNDSTP(f), dst_port,
663 f->fw_flg & IPV6_FW_F_DRNG))
664 continue;
665 break;
666 }
667
668 case IPPROTO_ICMPV6:
669 {
670 struct icmp6_hdr *icmp;
671
672 if (offset != 0) /* Type isn't valid */
673 break;
674 PULLUP_TO(off + 2);
675 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
676 if (!icmp6type_match(icmp, f))
677 continue;
678 break;
679 }
680 #undef PULLUP_TO
681
682 bogusfrag:
683 if (fw6_verbose)
684 ip6fw_report(NULL, ip6, rif, oif, off, nxt);
685 goto dropit;
686 }
687
688 got_match:
689 #ifndef IP6FW_DIVERT_RESTART
690 /* Ignore divert/tee rule if socket port is "ignport" */
691 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
692 case IPV6_FW_F_DIVERT:
693 case IPV6_FW_F_TEE:
694 if (f->fw_divert_port == ignport)
695 continue; /* ignore this rule */
696 break;
697 }
698
699 #endif /* IP6FW_DIVERT_RESTART */
700 /* Update statistics */
701 f->fw_pcnt += 1;
702 f->fw_bcnt += ntohs(ip6->ip6_plen);
703 f->timestamp = time_second;
704
705 /* Log to console if desired */
706 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
707 ip6fw_report(f, ip6, rif, oif, off, nxt);
708
709 /* Take appropriate action */
710 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
711 case IPV6_FW_F_ACCEPT:
712 return (0);
713 case IPV6_FW_F_COUNT:
714 continue;
715 case IPV6_FW_F_DIVERT:
716 #ifdef IP6FW_DIVERT_RESTART
717 *cookie = f->fw_number;
718 #else
719 *cookie = htons(f->fw_divert_port);
720 #endif /* IP6FW_DIVERT_RESTART */
721 return (f->fw_divert_port);
722 case IPV6_FW_F_TEE:
723 /*
724 * XXX someday tee packet here, but beware that you
725 * can't use m_copym() or m_copypacket() because
726 * the divert input routine modifies the mbuf
727 * (and these routines only increment reference
728 * counts in the case of mbuf clusters), so need
729 * to write custom routine.
730 */
731 continue;
732 case IPV6_FW_F_SKIPTO:
733 #ifdef DIAGNOSTIC
734 while (chain->chain.le_next
735 && chain->chain.le_next->rule->fw_number
736 < f->fw_skipto_rule)
737 #else
738 while (chain->chain.le_next->rule->fw_number
739 < f->fw_skipto_rule)
740 #endif
741 chain = chain->chain.le_next;
742 continue;
743 }
744
745 /* Deny/reject this packet using this rule */
746 rule = f;
747 break;
748 }
749
750 #ifdef DIAGNOSTIC
751 /* Rule 65535 should always be there and should always match */
752 if (!chain)
753 panic("ip6_fw: chain");
754 #endif
755
756 /*
757 * At this point, we're going to drop the packet.
758 * Send a reject notice if all of the following are true:
759 *
760 * - The packet matched a reject rule
761 * - The packet is not an ICMP packet, or is an ICMP query packet
762 * - The packet is not a multicast or broadcast packet
763 */
764 if (rule && (rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
765 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
766 && !((*m)->m_flags & (M_BCAST|M_MCAST))
767 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
768 switch (rule->fw_reject_code) {
769 case IPV6_FW_REJECT_RST:
770 #if 1 /* not tested */
771 {
772 struct tcphdr *const tcp =
773 (struct tcphdr *) ((caddr_t)ip6 + off);
774 struct {
775 struct ip6_hdr ip6;
776 struct tcphdr th;
777 } ti;
778 tcp_seq ack, seq;
779 int flags;
780
781 if (offset != 0 || (tcp->th_flags & TH_RST))
782 break;
783
784 ti.ip6 = *ip6;
785 ti.th = *tcp;
786 ti.th.th_seq = ntohl(ti.th.th_seq);
787 ti.th.th_ack = ntohl(ti.th.th_ack);
788 ti.ip6.ip6_nxt = IPPROTO_TCP;
789 if (ti.th.th_flags & TH_ACK) {
790 ack = 0;
791 seq = ti.th.th_ack;
792 flags = TH_RST;
793 } else {
794 ack = ti.th.th_seq;
795 if (((*m)->m_flags & M_PKTHDR) != 0) {
796 ack += (*m)->m_pkthdr.len - off
797 - (ti.th.th_off << 2);
798 } else if (ip6->ip6_plen) {
799 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
800 - off - (ti.th.th_off << 2);
801 } else {
802 m_freem(*m);
803 *m = 0;
804 break;
805 }
806 if (tcp->th_flags & TH_SYN)
807 ack++;
808 seq = 0;
809 flags = TH_RST|TH_ACK;
810 }
811 bcopy(&ti, ip6, sizeof(ti));
812 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1),
813 *m, ack, seq, flags);
814 *m = NULL;
815 break;
816 }
817 #endif
818 default: /* Send an ICMP unreachable using code */
819 if (oif)
820 (*m)->m_pkthdr.rcvif = oif;
821 icmp6_error(*m, ICMP6_DST_UNREACH,
822 rule->fw_reject_code, 0);
823 *m = NULL;
824 break;
825 }
826 }
827
828 dropit:
829 /*
830 * Finally, drop the packet.
831 */
832 if (*m) {
833 m_freem(*m);
834 *m = NULL;
835 }
836 return (0);
837 }
838
839 static int
840 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
841 {
842 struct ip6_fw *ftmp = 0;
843 struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
844 u_short nbr = 0;
845 int s;
846
847 fwc = malloc(sizeof *fwc, M_IP6FW, M_NOWAIT);
848 ftmp = malloc(sizeof *ftmp, M_IP6FW, M_NOWAIT);
849 if (!fwc || !ftmp) {
850 dprintf(("%s malloc said no\n", err_prefix));
851 if (fwc) free(fwc, M_IP6FW);
852 if (ftmp) free(ftmp, M_IP6FW);
853 return (ENOSPC);
854 }
855
856 bcopy(frwl, ftmp, sizeof(struct ip6_fw));
857 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
858 ftmp->fw_pcnt = 0L;
859 ftmp->fw_bcnt = 0L;
860 fwc->rule = ftmp;
861
862 s = splnet();
863
864 if (!chainptr->lh_first) {
865 LIST_INSERT_HEAD(chainptr, fwc, chain);
866 splx(s);
867 return (0);
868 } else if (ftmp->fw_number == (u_short)-1) {
869 if (fwc) free(fwc, M_IP6FW);
870 if (ftmp) free(ftmp, M_IP6FW);
871 splx(s);
872 dprintf(("%s bad rule number\n", err_prefix));
873 return (EINVAL);
874 }
875
876 /* If entry number is 0, find highest numbered rule and add 100 */
877 if (ftmp->fw_number == 0) {
878 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
879 if (fcp->rule->fw_number != (u_short)-1)
880 nbr = fcp->rule->fw_number;
881 else
882 break;
883 }
884 if (nbr < (u_short)-1 - 100)
885 nbr += 100;
886 ftmp->fw_number = nbr;
887 }
888
889 /* Got a valid number; now insert it, keeping the list ordered */
890 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
891 if (fcp->rule->fw_number > ftmp->fw_number) {
892 if (fcpl) {
893 LIST_INSERT_AFTER(fcpl, fwc, chain);
894 } else {
895 LIST_INSERT_HEAD(chainptr, fwc, chain);
896 }
897 break;
898 } else {
899 fcpl = fcp;
900 }
901 }
902
903 splx(s);
904 return (0);
905 }
906
907 static int
908 del_entry6(struct ip6_fw_head *chainptr, u_short number)
909 {
910 struct ip6_fw_chain *fcp;
911 int s;
912
913 s = splnet();
914
915 fcp = chainptr->lh_first;
916 if (number != (u_short)-1) {
917 for (; fcp; fcp = fcp->chain.le_next) {
918 if (fcp->rule->fw_number == number) {
919 LIST_REMOVE(fcp, chain);
920 splx(s);
921 free(fcp->rule, M_IP6FW);
922 free(fcp, M_IP6FW);
923 return 0;
924 }
925 }
926 }
927
928 splx(s);
929 return (EINVAL);
930 }
931
932 static int
933 zero_entry6(struct mbuf *m)
934 {
935 struct ip6_fw *frwl;
936 struct ip6_fw_chain *fcp;
937 int s;
938
939 if (m && m->m_len != 0) {
940 if (m->m_len != sizeof(struct ip6_fw))
941 return (EINVAL);
942 frwl = mtod(m, struct ip6_fw *);
943 }
944 else
945 frwl = NULL;
946
947 /*
948 * It's possible to insert multiple chain entries with the
949 * same number, so we don't stop after finding the first
950 * match if zeroing a specific entry.
951 */
952 s = splnet();
953 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
954 if (!frwl || frwl->fw_number == fcp->rule->fw_number) {
955 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
956 fcp->rule->timestamp = 0;
957 }
958 splx(s);
959
960 if (fw6_verbose) {
961 if (frwl)
962 log(LOG_SECURITY | LOG_NOTICE,
963 "ip6fw: Entry %d cleared.\n", frwl->fw_number);
964 else
965 log(LOG_SECURITY | LOG_NOTICE,
966 "ip6fw: Accounting cleared.\n");
967 }
968
969 return (0);
970 }
971
972 static struct ip6_fw *
973 check_ip6fw_mbuf(struct mbuf *m)
974 {
975 /* Check length */
976 if (m->m_len != sizeof(struct ip6_fw)) {
977 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len,
978 sizeof(struct ip6_fw)));
979 return (NULL);
980 }
981 return (check_ip6fw_struct(mtod(m, struct ip6_fw *)));
982 }
983
984 static struct ip6_fw *
985 check_ip6fw_struct(struct ip6_fw *frwl)
986 {
987 /* Check for invalid flag bits */
988 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
989 dprintf(("%s undefined flag bits set (flags=%x)\n",
990 err_prefix, frwl->fw_flg));
991 return (NULL);
992 }
993 /* Must apply to incoming or outgoing (or both) */
994 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
995 dprintf(("%s neither in nor out\n", err_prefix));
996 return (NULL);
997 }
998 /* Empty interface name is no good */
999 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
1000 && !*frwl->fw_in_if.fu_via_if.name)
1001 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
1002 && !*frwl->fw_out_if.fu_via_if.name)) {
1003 dprintf(("%s empty interface name\n", err_prefix));
1004 return (NULL);
1005 }
1006 /* Sanity check interface matching */
1007 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
1008 ; /* allow "via" backwards compatibility */
1009 } else if ((frwl->fw_flg & IPV6_FW_F_IN)
1010 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
1011 dprintf(("%s outgoing interface check on incoming\n",
1012 err_prefix));
1013 return (NULL);
1014 }
1015 /* Sanity check port ranges */
1016 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
1017 dprintf(("%s src range set but n_src_p=%d\n",
1018 err_prefix, IPV6_FW_GETNSRCP(frwl)));
1019 return (NULL);
1020 }
1021 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
1022 dprintf(("%s dst range set but n_dst_p=%d\n",
1023 err_prefix, IPV6_FW_GETNDSTP(frwl)));
1024 return (NULL);
1025 }
1026 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
1027 dprintf(("%s too many ports (%d+%d)\n",
1028 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
1029 return (NULL);
1030 }
1031 /*
1032 * Protocols other than TCP/UDP don't use port range
1033 */
1034 if ((frwl->fw_prot != IPPROTO_TCP) &&
1035 (frwl->fw_prot != IPPROTO_UDP) &&
1036 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
1037 dprintf(("%s port(s) specified for non TCP/UDP rule\n",
1038 err_prefix));
1039 return (NULL);
1040 }
1041
1042 /*
1043 * Rather than modify the entry to make such entries work,
1044 * we reject this rule and require user level utilities
1045 * to enforce whatever policy they deem appropriate.
1046 */
1047 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
1048 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
1049 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
1050 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
1051 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
1052 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
1053 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
1054 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
1055 dprintf(("%s rule never matches\n", err_prefix));
1056 return (NULL);
1057 }
1058
1059 if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
1060 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
1061 if (frwl->fw_nports) {
1062 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
1063 return (NULL);
1064 }
1065 if (frwl->fw_prot == IPPROTO_TCP &&
1066 frwl->fw_tcpf != frwl->fw_tcpnf) {
1067 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
1068 return (NULL);
1069 }
1070 }
1071
1072 /* Check command specific stuff */
1073 switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
1074 {
1075 case IPV6_FW_F_REJECT:
1076 if (frwl->fw_reject_code >= 0x100
1077 && !(frwl->fw_prot == IPPROTO_TCP
1078 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
1079 dprintf(("%s unknown reject code\n", err_prefix));
1080 return (NULL);
1081 }
1082 break;
1083 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */
1084 case IPV6_FW_F_TEE:
1085 if (frwl->fw_divert_port == 0) {
1086 dprintf(("%s can't divert to port 0\n", err_prefix));
1087 return (NULL);
1088 }
1089 break;
1090 case IPV6_FW_F_DENY:
1091 case IPV6_FW_F_ACCEPT:
1092 case IPV6_FW_F_COUNT:
1093 case IPV6_FW_F_SKIPTO:
1094 break;
1095 default:
1096 dprintf(("%s invalid command\n", err_prefix));
1097 return (NULL);
1098 }
1099
1100 return frwl;
1101 }
1102
1103 static int
1104 ip6_fw_ctl(int stage, struct mbuf **mm)
1105 {
1106 int error;
1107 struct mbuf *m;
1108
1109 if (stage == IPV6_FW_GET) {
1110 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1111 *mm = m = m_get(M_TRYWAIT, MT_DATA); /* XXX */
1112 if (!m)
1113 return (ENOBUFS);
1114 if (sizeof *(fcp->rule) > MLEN) {
1115 MCLGET(m, M_TRYWAIT);
1116 if ((m->m_flags & M_EXT) == 0) {
1117 m_free(m);
1118 return (ENOBUFS);
1119 }
1120 }
1121 for (; fcp; fcp = fcp->chain.le_next) {
1122 bcopy(fcp->rule, m->m_data, sizeof *(fcp->rule));
1123 m->m_len = sizeof *(fcp->rule);
1124 m->m_next = m_get(M_TRYWAIT, MT_DATA); /* XXX */
1125 if (!m->m_next) {
1126 m_freem(*mm);
1127 return (ENOBUFS);
1128 }
1129 m = m->m_next;
1130 if (sizeof *(fcp->rule) > MLEN) {
1131 MCLGET(m, M_TRYWAIT);
1132 if ((m->m_flags & M_EXT) == 0) {
1133 m_freem(*mm);
1134 return (ENOBUFS);
1135 }
1136 }
1137 m->m_len = 0;
1138 }
1139 return (0);
1140 }
1141 m = *mm;
1142 /* only allow get calls if secure mode > 2 */
1143 if (securelevel > 2) {
1144 if (m) {
1145 (void)m_freem(m);
1146 *mm = 0;
1147 }
1148 return (EPERM);
1149 }
1150 if (stage == IPV6_FW_FLUSH) {
1151 while (ip6_fw_chain.lh_first != NULL &&
1152 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1) {
1153 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1154 int s = splnet();
1155 LIST_REMOVE(ip6_fw_chain.lh_first, chain);
1156 splx(s);
1157 free(fcp->rule, M_IP6FW);
1158 free(fcp, M_IP6FW);
1159 }
1160 if (m) {
1161 (void)m_freem(m);
1162 *mm = 0;
1163 }
1164 return (0);
1165 }
1166 if (stage == IPV6_FW_ZERO) {
1167 error = zero_entry6(m);
1168 if (m) {
1169 (void)m_freem(m);
1170 *mm = 0;
1171 }
1172 return (error);
1173 }
1174 if (m == NULL) {
1175 printf("%s NULL mbuf ptr\n", err_prefix);
1176 return (EINVAL);
1177 }
1178
1179 if (stage == IPV6_FW_ADD) {
1180 struct ip6_fw *frwl = check_ip6fw_mbuf(m);
1181
1182 if (!frwl)
1183 error = EINVAL;
1184 else
1185 error = add_entry6(&ip6_fw_chain, frwl);
1186 if (m) {
1187 (void)m_freem(m);
1188 *mm = 0;
1189 }
1190 return error;
1191 }
1192 if (stage == IPV6_FW_DEL) {
1193 if (m->m_len != sizeof(struct ip6_fw)) {
1194 dprintf(("%s len=%d, want %zu\n", err_prefix, m->m_len,
1195 sizeof(struct ip6_fw)));
1196 error = EINVAL;
1197 } else if (mtod(m, struct ip6_fw *)->fw_number == (u_short)-1) {
1198 dprintf(("%s can't delete rule 65535\n", err_prefix));
1199 error = EINVAL;
1200 } else
1201 error = del_entry6(&ip6_fw_chain,
1202 mtod(m, struct ip6_fw *)->fw_number);
1203 if (m) {
1204 (void)m_freem(m);
1205 *mm = 0;
1206 }
1207 return error;
1208 }
1209
1210 dprintf(("%s unknown request %d\n", err_prefix, stage));
1211 if (m) {
1212 (void)m_freem(m);
1213 *mm = 0;
1214 }
1215 return (EINVAL);
1216 }
1217
1218 void
1219 ip6_fw_init(void)
1220 {
1221 struct ip6_fw default_rule;
1222
1223 ip6_fw_chk_ptr = ip6_fw_chk;
1224 ip6_fw_ctl_ptr = ip6_fw_ctl;
1225 LIST_INIT(&ip6_fw_chain);
1226
1227 bzero(&default_rule, sizeof default_rule);
1228 default_rule.fw_prot = IPPROTO_IPV6;
1229 default_rule.fw_number = (u_short)-1;
1230 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1231 default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
1232 #else
1233 default_rule.fw_flg |= IPV6_FW_F_DENY;
1234 #endif
1235 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
1236 if (check_ip6fw_struct(&default_rule) == NULL ||
1237 add_entry6(&ip6_fw_chain, &default_rule))
1238 panic(__func__);
1239
1240 /* Setup our sysctl tree */
1241 sysctl_ctx_init(&ip6_fw_sysctl_ctx);
1242 ip6_fw_sysctl_tree = SYSCTL_ADD_NODE(&ip6_fw_sysctl_ctx,
1243 SYSCTL_STATIC_CHILDREN(_net_inet6_ip6), OID_AUTO, "fw",
1244 CTLFLAG_RW | CTLFLAG_SECURE, 0, "Firewall");
1245 SYSCTL_ADD_INT(&ip6_fw_sysctl_ctx, SYSCTL_CHILDREN(ip6_fw_sysctl_tree),
1246 OID_AUTO, "enable", CTLFLAG_RW | CTLFLAG_SECURE, &ip6_fw_enable, 0,
1247 "Enable ip6fw");
1248 SYSCTL_ADD_INT(&ip6_fw_sysctl_ctx, SYSCTL_CHILDREN(ip6_fw_sysctl_tree),
1249 OID_AUTO, "debug", CTLFLAG_RW, &fw6_debug, 0, "");
1250 SYSCTL_ADD_INT(&ip6_fw_sysctl_ctx, SYSCTL_CHILDREN(ip6_fw_sysctl_tree),
1251 OID_AUTO, "verbose", CTLFLAG_RW | CTLFLAG_SECURE, &fw6_verbose, 0,
1252 "");
1253 SYSCTL_ADD_INT(&ip6_fw_sysctl_ctx, SYSCTL_CHILDREN(ip6_fw_sysctl_tree),
1254 OID_AUTO, "verbose_limit", CTLFLAG_RW, &fw6_verbose_limit, 0, "");
1255
1256 printf("IPv6 packet filtering initialized, ");
1257 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1258 printf("default to accept, ");
1259 #endif
1260 #ifndef IPV6FIREWALL_VERBOSE
1261 printf("logging disabled\n");
1262 #else
1263 if (fw6_verbose_limit == 0)
1264 printf("unlimited logging\n");
1265 else
1266 printf("logging limited to %d packets/entry\n",
1267 fw6_verbose_limit);
1268 #endif
1269 }
1270
1271 static ip6_fw_chk_t *old_chk_ptr;
1272 static ip6_fw_ctl_t *old_ctl_ptr;
1273
1274 static int
1275 ip6fw_modevent(module_t mod, int type, void *unused)
1276 {
1277 int s;
1278
1279 switch (type) {
1280 case MOD_LOAD:
1281 s = splnet();
1282
1283 old_chk_ptr = ip6_fw_chk_ptr;
1284 old_ctl_ptr = ip6_fw_ctl_ptr;
1285
1286 ip6_fw_init();
1287 splx(s);
1288 return 0;
1289 case MOD_UNLOAD:
1290 s = splnet();
1291 ip6_fw_chk_ptr = old_chk_ptr;
1292 ip6_fw_ctl_ptr = old_ctl_ptr;
1293 while (LIST_FIRST(&ip6_fw_chain) != NULL) {
1294 struct ip6_fw_chain *fcp = LIST_FIRST(&ip6_fw_chain);
1295 LIST_REMOVE(LIST_FIRST(&ip6_fw_chain), chain);
1296 free(fcp->rule, M_IP6FW);
1297 free(fcp, M_IP6FW);
1298 }
1299
1300 /* Free sysctl tree */
1301 sysctl_ctx_free(&ip6_fw_sysctl_ctx);
1302
1303 splx(s);
1304 printf("IPv6 firewall unloaded\n");
1305 return 0;
1306 default:
1307 return EOPNOTSUPP;
1308 break;
1309 }
1310 return 0;
1311 }
1312
1313 static moduledata_t ip6fwmod = {
1314 "ip6fw",
1315 ip6fw_modevent,
1316 0
1317 };
1318 DECLARE_MODULE(ip6fw, ip6fwmod, SI_SUB_PSEUDO, SI_ORDER_ANY);
Cache object: 3c9a9af02f7e5a4262035bcdc2e8ed13
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