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[apple/xnu.git] / bsd / netinet6 / ip6_fw.c
1 /*
2 * Copyright (c) 2003-2012 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28
29 /* $FreeBSD: src/sys/netinet6/ip6_fw.c,v 1.2.2.9 2002/04/28 05:40:27 suz Exp $ */
30 /* $KAME: ip6_fw.c,v 1.21 2001/01/24 01:25:32 itojun Exp $ */
31
32 /*
33 * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project.
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the project nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61 /*
62 * Copyright (c) 1993 Daniel Boulet
63 * Copyright (c) 1994 Ugen J.S.Antsilevich
64 * Copyright (c) 1996 Alex Nash
65 *
66 * Redistribution and use in source forms, with and without modification,
67 * are permitted provided that this entire comment appears intact.
68 *
69 * Redistribution in binary form may occur without any restrictions.
70 * Obviously, it would be nice if you gave credit where credit is due
71 * but requiring it would be too onerous.
72 *
73 * This software is provided ``AS IS'' without any warranties of any kind.
74 */
75
76 /*
77 * Implement IPv6 packet firewall
78 */
79
80
81 #ifdef IP6DIVERT
82 #error "NOT SUPPORTED IPV6 DIVERT"
83 #endif
84 #ifdef IP6FW_DIVERT_RESTART
85 #error "NOT SUPPORTED IPV6 DIVERT"
86 #endif
87
88 #include <string.h>
89 #include <machine/spl.h>
90
91 #include <sys/param.h>
92 #include <sys/systm.h>
93 #include <sys/malloc.h>
94 #include <sys/mbuf.h>
95 #include <sys/queue.h>
96 #include <sys/kernel.h>
97 #include <sys/socket.h>
98 #include <sys/socketvar.h>
99 #include <sys/syslog.h>
100 #include <sys/lock.h>
101 #include <sys/time.h>
102 #include <sys/kern_event.h>
103
104 #include <net/if.h>
105 #include <net/route.h>
106 #include <netinet/in_systm.h>
107 #include <netinet/in.h>
108 #include <netinet/ip.h>
109
110 #include <netinet/ip6.h>
111 #include <netinet6/ip6_var.h>
112 #include <netinet6/in6_var.h>
113 #include <netinet/icmp6.h>
114
115 #include <netinet/in_pcb.h>
116
117 #include <netinet6/ip6_fw.h>
118 #include <netinet/ip_var.h>
119 #include <netinet/tcp.h>
120 #include <netinet/tcp_seq.h>
121 #include <netinet/tcp_timer.h>
122 #include <netinet/tcp_var.h>
123 #include <netinet/udp.h>
124
125 #include <sys/sysctl.h>
126
127 #include <net/net_osdep.h>
128
129 MALLOC_DEFINE(M_IP6FW, "Ip6Fw/Ip6Acct", "Ip6Fw/Ip6Acct chain's");
130
131 static int fw6_debug = 0;
132 #ifdef IPV6FIREWALL_VERBOSE
133 static int fw6_verbose = 1;
134 #else
135 static int fw6_verbose = 0;
136 #endif
137 #ifdef IPV6FIREWALL_VERBOSE_LIMIT
138 static int fw6_verbose_limit = IPV6FIREWALL_VERBOSE_LIMIT;
139 #else
140 static int fw6_verbose_limit = 0;
141 #endif
142
143 LIST_HEAD (ip6_fw_head, ip6_fw_chain) ip6_fw_chain;
144
145 static void ip6fw_kev_post_msg(u_int32_t );
146
147 #ifdef SYSCTL_NODE
148 static int ip6fw_sysctl SYSCTL_HANDLER_ARGS;
149
150 SYSCTL_DECL(_net_inet6_ip6);
151 SYSCTL_NODE(_net_inet6_ip6, OID_AUTO, fw, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Firewall");
152 SYSCTL_PROC(_net_inet6_ip6_fw, OID_AUTO, enable,
153 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
154 &ip6_fw_enable, 0, ip6fw_sysctl, "I", "Enable ip6fw");
155 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, debug, CTLFLAG_RW | CTLFLAG_LOCKED, &fw6_debug, 0, "");
156 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose, CTLFLAG_RW | CTLFLAG_LOCKED, &fw6_verbose, 0, "");
157 SYSCTL_INT(_net_inet6_ip6_fw, OID_AUTO, verbose_limit, CTLFLAG_RW | CTLFLAG_LOCKED, &fw6_verbose_limit, 0, "");
158
159 static int
160 ip6fw_sysctl SYSCTL_HANDLER_ARGS
161 {
162 #pragma unused(arg1, arg2)
163 int error;
164
165 error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
166 if (error || !req->newptr)
167 return (error);
168
169 ip6fw_kev_post_msg(KEV_IP6FW_ENABLE);
170
171 return error;
172 }
173
174 #endif
175
176 #define dprintf(a) do { \
177 if (fw6_debug) \
178 printf a; \
179 } while (0)
180 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
181
182 static int add_entry6 __P((struct ip6_fw_head *chainptr, struct ip6_fw *frwl));
183 static int del_entry6 __P((struct ip6_fw_head *chainptr, u_short number));
184 static int zero_entry6 __P((struct ip6_fw *frwl));
185 static struct ip6_fw *check_ip6fw_struct __P((struct ip6_fw *m));
186 static int ip6opts_match __P((struct ip6_hdr **ip6, struct ip6_fw *f,
187 struct mbuf **m,
188 int *off, int *nxt, u_short *offset));
189 static int port_match6 __P((u_short *portptr, int nports, u_short port,
190 int range_flag));
191 static int tcp6flg_match __P((struct tcphdr *tcp6, struct ip6_fw *f));
192 static int icmp6type_match __P((struct icmp6_hdr * icmp, struct ip6_fw * f));
193 static void ip6fw_report __P((struct ip6_fw *f, struct ip6_hdr *ip6,
194 struct ifnet *rif, struct ifnet *oif, int off, int nxt));
195
196 static int ip6_fw_chk __P((struct ip6_hdr **pip6,
197 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m));
198 static int ip6_fw_ctl __P((struct sockopt *));
199 static void cp_to_user_64( struct ip6_fw_64 *userrule_64, struct ip6_fw *rule);
200 static void cp_from_user_64( struct ip6_fw_64 *userrule_64, struct ip6_fw *rule);
201 static void cp_to_user_32( struct ip6_fw_32 *userrule_32, struct ip6_fw *rule);
202 static void cp_from_user_32( struct ip6_fw_32 *userrule_32, struct ip6_fw *rule);
203
204 static char err_prefix[] = "ip6_fw_ctl:";
205
206 /*
207 * Returns 1 if the port is matched by the vector, 0 otherwise
208 */
209 static
210 __inline int
211 port_match6(u_short *portptr, int nports, u_short port, int range_flag)
212 {
213 if (!nports)
214 return 1;
215 if (range_flag) {
216 if (portptr[0] <= port && port <= portptr[1]) {
217 return 1;
218 }
219 nports -= 2;
220 portptr += 2;
221 }
222 while (nports-- > 0) {
223 if (*portptr++ == port) {
224 return 1;
225 }
226 }
227 return 0;
228 }
229
230 static int
231 tcp6flg_match(struct tcphdr *tcp6, struct ip6_fw *f)
232 {
233 u_char flg_set, flg_clr;
234
235 /*
236 * If an established connection is required, reject packets that
237 * have only SYN of RST|ACK|SYN set. Otherwise, fall through to
238 * other flag requirements.
239 */
240 if ((f->fw_ipflg & IPV6_FW_IF_TCPEST) &&
241 ((tcp6->th_flags & (IPV6_FW_TCPF_RST | IPV6_FW_TCPF_ACK |
242 IPV6_FW_TCPF_SYN)) == IPV6_FW_TCPF_SYN))
243 return 0;
244
245 flg_set = tcp6->th_flags & f->fw_tcpf;
246 flg_clr = tcp6->th_flags & f->fw_tcpnf;
247
248 if (flg_set != f->fw_tcpf)
249 return 0;
250 if (flg_clr)
251 return 0;
252
253 return 1;
254 }
255
256 static int
257 icmp6type_match(struct icmp6_hdr *icmp6, struct ip6_fw *f)
258 {
259 int type;
260
261 if (!(f->fw_flg & IPV6_FW_F_ICMPBIT))
262 return(1);
263
264 type = icmp6->icmp6_type;
265
266 /* check for matching type in the bitmap */
267 if (type < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8 &&
268 (f->fw_icmp6types[type / (sizeof(unsigned) * 8)] &
269 (1U << (type % (8 * sizeof(unsigned))))))
270 return(1);
271
272 return(0); /* no match */
273 }
274
275 static int
276 is_icmp6_query(struct ip6_hdr *ip6, int off)
277 {
278 const struct icmp6_hdr *icmp6;
279 int icmp6_type;
280
281 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
282 icmp6_type = icmp6->icmp6_type;
283
284 if (icmp6_type == ICMP6_ECHO_REQUEST ||
285 icmp6_type == ICMP6_MEMBERSHIP_QUERY ||
286 icmp6_type == ICMP6_WRUREQUEST ||
287 icmp6_type == ICMP6_FQDN_QUERY ||
288 icmp6_type == ICMP6_NI_QUERY)
289 return(1);
290
291 return(0);
292 }
293
294 static int
295 ip6opts_match(struct ip6_hdr **pip6, struct ip6_fw *f, struct mbuf **m,
296 int *off, int *nxt, u_short *offset)
297 {
298 int len;
299 struct ip6_hdr *ip6 = *pip6;
300 struct ip6_ext *ip6e;
301 u_char opts, nopts, nopts_sve;
302
303 opts = f->fw_ip6opt;
304 nopts = nopts_sve = f->fw_ip6nopt;
305
306 *nxt = ip6->ip6_nxt;
307 *off = sizeof(struct ip6_hdr);
308 len = ntohs(ip6->ip6_plen) + sizeof(struct ip6_hdr);
309 while (*off < len) {
310 ip6e = (struct ip6_ext *)((caddr_t) ip6 + *off);
311 if ((*m)->m_len < *off + sizeof(*ip6e))
312 goto opts_check; /* XXX */
313
314 switch(*nxt) {
315 case IPPROTO_FRAGMENT:
316 if ((*m)->m_len >= *off + sizeof(struct ip6_frag)) {
317 struct ip6_frag *ip6f;
318
319 ip6f = (struct ip6_frag *) ((caddr_t)ip6 + *off);
320 *offset = ip6f->ip6f_offlg & IP6F_OFF_MASK;
321 }
322 opts &= ~IPV6_FW_IP6OPT_FRAG;
323 nopts &= ~IPV6_FW_IP6OPT_FRAG;
324 *off += sizeof(struct ip6_frag);
325 break;
326 case IPPROTO_AH:
327 opts &= ~IPV6_FW_IP6OPT_AH;
328 nopts &= ~IPV6_FW_IP6OPT_AH;
329 *off += (ip6e->ip6e_len + 2) << 2;
330 break;
331 default:
332 switch (*nxt) {
333 case IPPROTO_HOPOPTS:
334 opts &= ~IPV6_FW_IP6OPT_HOPOPT;
335 nopts &= ~IPV6_FW_IP6OPT_HOPOPT;
336 break;
337 case IPPROTO_ROUTING:
338 opts &= ~IPV6_FW_IP6OPT_ROUTE;
339 nopts &= ~IPV6_FW_IP6OPT_ROUTE;
340 break;
341 case IPPROTO_ESP:
342 opts &= ~IPV6_FW_IP6OPT_ESP;
343 nopts &= ~IPV6_FW_IP6OPT_ESP;
344 break;
345 case IPPROTO_NONE:
346 opts &= ~IPV6_FW_IP6OPT_NONXT;
347 nopts &= ~IPV6_FW_IP6OPT_NONXT;
348 goto opts_check;
349 break;
350 case IPPROTO_DSTOPTS:
351 opts &= ~IPV6_FW_IP6OPT_OPTS;
352 nopts &= ~IPV6_FW_IP6OPT_OPTS;
353 break;
354 default:
355 goto opts_check;
356 break;
357 }
358 *off += (ip6e->ip6e_len + 1) << 3;
359 break;
360 }
361 *nxt = ip6e->ip6e_nxt;
362
363 }
364 opts_check:
365 if (f->fw_ip6opt == f->fw_ip6nopt) /* XXX */
366 return 1;
367
368 if (opts == 0 && nopts == nopts_sve)
369 return 1;
370 else
371 return 0;
372 }
373
374 static
375 __inline int
376 iface_match(struct ifnet *ifp, union ip6_fw_if *ifu, int byname)
377 {
378 /* Check by name or by IP address */
379 if (byname) {
380 /* Check unit number (-1 is wildcard) */
381 if (ifu->fu_via_if.unit != -1
382 && ifp->if_unit != ifu->fu_via_if.unit)
383 return(0);
384 /* Check name */
385 if (strncmp(ifp->if_name, ifu->fu_via_if.name, IP6FW_IFNLEN))
386 return(0);
387 return(1);
388 } else if (!IN6_IS_ADDR_UNSPECIFIED(&ifu->fu_via_ip6)) { /* Zero == wildcard */
389 struct ifaddr *ia;
390
391 ifnet_lock_shared(ifp);
392 for (ia = ifp->if_addrlist.tqh_first; ia;
393 ia = ia->ifa_list.tqe_next)
394 {
395 IFA_LOCK_SPIN(ia);
396 if (ia->ifa_addr->sa_family != AF_INET6) {
397 IFA_UNLOCK(ia);
398 continue;
399 }
400 if (!IN6_ARE_ADDR_EQUAL(&ifu->fu_via_ip6,
401 &(((struct sockaddr_in6 *)
402 (ia->ifa_addr))->sin6_addr))) {
403 IFA_UNLOCK(ia);
404 continue;
405 }
406 IFA_UNLOCK(ia);
407 ifnet_lock_done(ifp);
408 return(1);
409 }
410 ifnet_lock_done(ifp);
411 return(0);
412 }
413 return(1);
414 }
415
416 static void
417 ip6fw_report(struct ip6_fw *f, struct ip6_hdr *ip6,
418 struct ifnet *rif, struct ifnet *oif, int off, int nxt)
419 {
420 static int counter;
421 struct tcphdr *const tcp6 = (struct tcphdr *) ((caddr_t) ip6+ off);
422 struct udphdr *const udp = (struct udphdr *) ((caddr_t) ip6+ off);
423 struct icmp6_hdr *const icmp6 = (struct icmp6_hdr *) ((caddr_t) ip6+ off);
424 int count;
425 const char *action;
426 char action2[32], proto[102], name[18];
427 int len;
428
429 count = f ? f->fw_pcnt : ++counter;
430 if (fw6_verbose_limit != 0 && count > fw6_verbose_limit)
431 return;
432
433 /* Print command name */
434 snprintf(SNPARGS(name, 0), "ip6fw: %d", f ? f->fw_number : -1);
435
436 action = action2;
437 if (!f)
438 action = "Refuse";
439 else {
440 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
441 case IPV6_FW_F_DENY:
442 action = "Deny";
443 break;
444 case IPV6_FW_F_REJECT:
445 if (f->fw_reject_code == IPV6_FW_REJECT_RST)
446 action = "Reset";
447 else
448 action = "Unreach";
449 break;
450 case IPV6_FW_F_ACCEPT:
451 action = "Accept";
452 break;
453 case IPV6_FW_F_COUNT:
454 action = "Count";
455 break;
456 case IPV6_FW_F_DIVERT:
457 snprintf(SNPARGS(action2, 0), "Divert %d",
458 f->fw_divert_port);
459 break;
460 case IPV6_FW_F_TEE:
461 snprintf(SNPARGS(action2, 0), "Tee %d",
462 f->fw_divert_port);
463 break;
464 case IPV6_FW_F_SKIPTO:
465 snprintf(SNPARGS(action2, 0), "SkipTo %d",
466 f->fw_skipto_rule);
467 break;
468 default:
469 action = "UNKNOWN";
470 break;
471 }
472 }
473
474 switch (nxt) {
475 case IPPROTO_TCP:
476 len = snprintf(SNPARGS(proto, 0), "TCP [%s]",
477 ip6_sprintf(&ip6->ip6_src));
478 if (off > 0)
479 len += snprintf(SNPARGS(proto, len), ":%d ",
480 ntohs(tcp6->th_sport));
481 else
482 len += snprintf(SNPARGS(proto, len), " ");
483 len += snprintf(SNPARGS(proto, len), "[%s]",
484 ip6_sprintf(&ip6->ip6_dst));
485 if (off > 0)
486 snprintf(SNPARGS(proto, len), ":%d",
487 ntohs(tcp6->th_dport));
488 break;
489 case IPPROTO_UDP:
490 len = snprintf(SNPARGS(proto, 0), "UDP [%s]",
491 ip6_sprintf(&ip6->ip6_src));
492 if (off > 0)
493 len += snprintf(SNPARGS(proto, len), ":%d ",
494 ntohs(udp->uh_sport));
495 else
496 len += snprintf(SNPARGS(proto, len), " ");
497 len += snprintf(SNPARGS(proto, len), "[%s]",
498 ip6_sprintf(&ip6->ip6_dst));
499 if (off > 0)
500 snprintf(SNPARGS(proto, len), ":%d",
501 ntohs(udp->uh_dport));
502 break;
503 case IPPROTO_ICMPV6:
504 if (off > 0)
505 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP:%u.%u ",
506 icmp6->icmp6_type, icmp6->icmp6_code);
507 else
508 len = snprintf(SNPARGS(proto, 0), "IPV6-ICMP ");
509 len += snprintf(SNPARGS(proto, len), "[%s]",
510 ip6_sprintf(&ip6->ip6_src));
511 snprintf(SNPARGS(proto, len), " [%s]",
512 ip6_sprintf(&ip6->ip6_dst));
513 break;
514 default:
515 len = snprintf(SNPARGS(proto, 0), "P:%d [%s]", nxt,
516 ip6_sprintf(&ip6->ip6_src));
517 snprintf(SNPARGS(proto, len), " [%s]",
518 ip6_sprintf(&ip6->ip6_dst));
519 break;
520 }
521
522 if (oif)
523 log(LOG_AUTHPRIV | LOG_INFO, "%s %s %s out via %s\n",
524 name, action, proto, if_name(oif));
525 else if (rif)
526 log(LOG_AUTHPRIV | LOG_INFO, "%s %s %s in via %s\n",
527 name, action, proto, if_name(rif));
528 else
529 log(LOG_AUTHPRIV | LOG_INFO, "%s %s %s",
530 name, action, proto);
531 if (fw6_verbose_limit != 0 && count == fw6_verbose_limit)
532 log(LOG_AUTHPRIV | LOG_INFO, "ip6fw: limit reached on entry %d\n",
533 f ? f->fw_number : -1);
534 }
535
536 /*
537 * Parameters:
538 *
539 * ip Pointer to packet header (struct ip6_hdr *)
540 * hlen Packet header length
541 * oif Outgoing interface, or NULL if packet is incoming
542 * #ifndef IP6FW_DIVERT_RESTART
543 * *cookie Ignore all divert/tee rules to this port (if non-zero)
544 * #else
545 * *cookie Skip up to the first rule past this rule number;
546 * #endif
547 * *m The packet; we set to NULL when/if we nuke it.
548 *
549 * Return value:
550 *
551 * 0 The packet is to be accepted and routed normally OR
552 * the packet was denied/rejected and has been dropped;
553 * in the latter case, *m is equal to NULL upon return.
554 * port Divert the packet to port.
555 */
556
557 static int
558 ip6_fw_chk(struct ip6_hdr **pip6,
559 struct ifnet *oif, u_int16_t *cookie, struct mbuf **m)
560 {
561 struct ip6_fw_chain *chain;
562 struct ip6_fw *rule = NULL;
563 struct ip6_hdr *ip6 = *pip6;
564 struct ifnet *const rif = ((*m)->m_flags & M_LOOP) ? lo_ifp : (*m)->m_pkthdr.rcvif;
565 u_short offset = 0;
566 int off = sizeof(struct ip6_hdr), nxt = ip6->ip6_nxt;
567 u_short src_port, dst_port;
568 #ifdef IP6FW_DIVERT_RESTART
569 u_int16_t skipto = *cookie;
570 #else
571 u_int16_t ignport = ntohs(*cookie);
572 #endif
573 struct timeval timenow;
574
575 getmicrotime(&timenow);
576
577 *cookie = 0;
578 /*
579 * Go down the chain, looking for enlightment
580 * #ifdef IP6FW_DIVERT_RESTART
581 * If we've been asked to start at a given rule immediatly, do so.
582 * #endif
583 */
584 chain = LIST_FIRST(&ip6_fw_chain);
585 #ifdef IP6FW_DIVERT_RESTART
586 if (skipto) {
587 if (skipto >= 65535)
588 goto dropit;
589 while (chain && (chain->rule->fw_number <= skipto)) {
590 chain = LIST_NEXT(chain, chain);
591 }
592 if (! chain) goto dropit;
593 }
594 #endif /* IP6FW_DIVERT_RESTART */
595 for (; chain; chain = LIST_NEXT(chain, chain)) {
596 struct ip6_fw *const f = chain->rule;
597
598 if (oif) {
599 /* Check direction outbound */
600 if (!(f->fw_flg & IPV6_FW_F_OUT))
601 continue;
602 } else {
603 /* Check direction inbound */
604 if (!(f->fw_flg & IPV6_FW_F_IN))
605 continue;
606 }
607
608 #define IN6_ARE_ADDR_MASKEQUAL(x,y,z) (\
609 (((x)->s6_addr32[0] & (y)->s6_addr32[0]) == (z)->s6_addr32[0]) && \
610 (((x)->s6_addr32[1] & (y)->s6_addr32[1]) == (z)->s6_addr32[1]) && \
611 (((x)->s6_addr32[2] & (y)->s6_addr32[2]) == (z)->s6_addr32[2]) && \
612 (((x)->s6_addr32[3] & (y)->s6_addr32[3]) == (z)->s6_addr32[3]))
613
614 /* If src-addr doesn't match, not this rule. */
615 if (((f->fw_flg & IPV6_FW_F_INVSRC) != 0) ^
616 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_src,&f->fw_smsk,&f->fw_src)))
617 continue;
618
619 /* If dest-addr doesn't match, not this rule. */
620 if (((f->fw_flg & IPV6_FW_F_INVDST) != 0) ^
621 (!IN6_ARE_ADDR_MASKEQUAL(&ip6->ip6_dst,&f->fw_dmsk,&f->fw_dst)))
622 continue;
623
624 #undef IN6_ARE_ADDR_MASKEQUAL
625 /* Interface check */
626 if ((f->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
627 struct ifnet *const iface = oif ? oif : rif;
628
629 /* Backwards compatibility hack for "via" */
630 if (!iface || !iface_match(iface,
631 &f->fw_in_if, f->fw_flg & IPV6_FW_F_OIFNAME))
632 continue;
633 } else {
634 /* Check receive interface */
635 if ((f->fw_flg & IPV6_FW_F_IIFACE)
636 && (!rif || !iface_match(rif,
637 &f->fw_in_if, f->fw_flg & IPV6_FW_F_IIFNAME)))
638 continue;
639 /* Check outgoing interface */
640 if ((f->fw_flg & IPV6_FW_F_OIFACE)
641 && (!oif || !iface_match(oif,
642 &f->fw_out_if, f->fw_flg & IPV6_FW_F_OIFNAME)))
643 continue;
644 }
645
646 /* Check IP options */
647 if (!ip6opts_match(&ip6, f, m, &off, &nxt, &offset))
648 continue;
649
650 /* Fragments */
651 if ((f->fw_flg & IPV6_FW_F_FRAG) && !offset)
652 continue;
653
654 /* Check protocol; if wildcard, match */
655 if (f->fw_prot == IPPROTO_IPV6)
656 goto got_match;
657
658 /* If different, don't match */
659 if (nxt != f->fw_prot)
660 continue;
661
662 #define PULLUP_TO(len) do { \
663 if ((*m)->m_len < (len) \
664 && (*m = m_pullup(*m, (len))) == 0) { \
665 goto dropit; \
666 } \
667 *pip6 = ip6 = mtod(*m, struct ip6_hdr *); \
668 } while (0)
669
670 /* Protocol specific checks */
671 switch (nxt) {
672 case IPPROTO_TCP:
673 {
674 struct tcphdr *tcp6;
675
676 if (offset == 1) { /* cf. RFC 1858 */
677 PULLUP_TO(off + 4); /* XXX ? */
678 goto bogusfrag;
679 }
680 if (offset != 0) {
681 /*
682 * TCP flags and ports aren't available in this
683 * packet -- if this rule specified either one,
684 * we consider the rule a non-match.
685 */
686 if (f->fw_nports != 0 ||
687 f->fw_tcpf != f->fw_tcpnf)
688 continue;
689
690 break;
691 }
692 PULLUP_TO(off + 14);
693 tcp6 = (struct tcphdr *) ((caddr_t)ip6 + off);
694 if (((f->fw_tcpf != f->fw_tcpnf) ||
695 (f->fw_ipflg & IPV6_FW_IF_TCPEST)) &&
696 !tcp6flg_match(tcp6, f))
697 continue;
698 src_port = ntohs(tcp6->th_sport);
699 dst_port = ntohs(tcp6->th_dport);
700 goto check_ports;
701 }
702
703 case IPPROTO_UDP:
704 {
705 struct udphdr *udp;
706
707 if (offset != 0) {
708 /*
709 * Port specification is unavailable -- if this
710 * rule specifies a port, we consider the rule
711 * a non-match.
712 */
713 if (f->fw_nports != 0)
714 continue;
715
716 break;
717 }
718 PULLUP_TO(off + 4);
719 udp = (struct udphdr *) ((caddr_t)ip6 + off);
720 src_port = ntohs(udp->uh_sport);
721 dst_port = ntohs(udp->uh_dport);
722 check_ports:
723 if (!port_match6(&f->fw_pts[0],
724 IPV6_FW_GETNSRCP(f), src_port,
725 f->fw_flg & IPV6_FW_F_SRNG))
726 continue;
727 if (!port_match6(&f->fw_pts[IPV6_FW_GETNSRCP(f)],
728 IPV6_FW_GETNDSTP(f), dst_port,
729 f->fw_flg & IPV6_FW_F_DRNG))
730 continue;
731 break;
732 }
733
734 case IPPROTO_ICMPV6:
735 {
736 struct icmp6_hdr *icmp;
737
738 if (offset != 0) /* Type isn't valid */
739 break;
740 PULLUP_TO(off + 2);
741 icmp = (struct icmp6_hdr *) ((caddr_t)ip6 + off);
742 if (!icmp6type_match(icmp, f))
743 continue;
744 break;
745 }
746 #undef PULLUP_TO
747
748 bogusfrag:
749 if (fw6_verbose)
750 ip6fw_report(NULL, ip6, rif, oif, off, nxt);
751 goto dropit;
752 }
753
754 got_match:
755 #ifndef IP6FW_DIVERT_RESTART
756 /* Ignore divert/tee rule if socket port is "ignport" */
757 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
758 case IPV6_FW_F_DIVERT:
759 case IPV6_FW_F_TEE:
760 if (f->fw_divert_port == ignport)
761 continue; /* ignore this rule */
762 break;
763 }
764
765 #endif /* IP6FW_DIVERT_RESTART */
766 /* Update statistics */
767 f->fw_pcnt += 1;
768 f->fw_bcnt += ntohs(ip6->ip6_plen);
769 f->timestamp = timenow.tv_sec;
770
771 /* Log to console if desired */
772 if ((f->fw_flg & IPV6_FW_F_PRN) && fw6_verbose)
773 ip6fw_report(f, ip6, rif, oif, off, nxt);
774
775 /* Take appropriate action */
776 switch (f->fw_flg & IPV6_FW_F_COMMAND) {
777 case IPV6_FW_F_ACCEPT:
778 return(0);
779 case IPV6_FW_F_COUNT:
780 continue;
781 case IPV6_FW_F_DIVERT:
782 #ifdef IP6FW_DIVERT_RESTART
783 *cookie = f->fw_number;
784 #else
785 *cookie = htons(f->fw_divert_port);
786 #endif /* IP6FW_DIVERT_RESTART */
787 return(f->fw_divert_port);
788 case IPV6_FW_F_TEE:
789 /*
790 * XXX someday tee packet here, but beware that you
791 * can't use m_copym() or m_copypacket() because
792 * the divert input routine modifies the mbuf
793 * (and these routines only increment reference
794 * counts in the case of mbuf clusters), so need
795 * to write custom routine.
796 */
797 continue;
798 case IPV6_FW_F_SKIPTO:
799 #ifdef DIAGNOSTIC
800 while (chain->chain.le_next
801 && chain->chain.le_next->rule->fw_number
802 < f->fw_skipto_rule)
803 #else
804 while (chain->chain.le_next->rule->fw_number
805 < f->fw_skipto_rule)
806 #endif
807 chain = chain->chain.le_next;
808 continue;
809 }
810
811 /* Deny/reject this packet using this rule */
812 rule = f;
813 break;
814 }
815
816 #ifdef DIAGNOSTIC
817 /* Rule 65535 should always be there and should always match */
818 if (!chain)
819 panic("ip6_fw: chain");
820 #endif
821
822 /*
823 * At this point, we're going to drop the packet.
824 * Send a reject notice if all of the following are true:
825 *
826 * - The packet matched a reject rule
827 * - The packet is not an ICMP packet, or is an ICMP query packet
828 * - The packet is not a multicast or broadcast packet
829 */
830 if ((rule->fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
831 && (nxt != IPPROTO_ICMPV6 || is_icmp6_query(ip6, off))
832 && !((*m)->m_flags & (M_BCAST|M_MCAST))
833 && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
834 switch (rule->fw_reject_code) {
835 case IPV6_FW_REJECT_RST:
836 {
837 struct tcphdr *const tcp =
838 (struct tcphdr *) ((caddr_t)ip6 + off);
839 struct {
840 struct ip6_hdr ip6;
841 struct tcphdr th;
842 } ti;
843 tcp_seq ack, seq;
844 int flags;
845
846 if (offset != 0 || (tcp->th_flags & TH_RST))
847 break;
848
849 ti.ip6 = *ip6;
850 ti.th = *tcp;
851 ti.th.th_seq = ntohl(ti.th.th_seq);
852 ti.th.th_ack = ntohl(ti.th.th_ack);
853 ti.ip6.ip6_nxt = IPPROTO_TCP;
854 if (ti.th.th_flags & TH_ACK) {
855 ack = 0;
856 seq = ti.th.th_ack;
857 flags = TH_RST;
858 } else {
859 ack = ti.th.th_seq;
860 if (((*m)->m_flags & M_PKTHDR) != 0) {
861 ack += (*m)->m_pkthdr.len - off
862 - (ti.th.th_off << 2);
863 } else if (ip6->ip6_plen) {
864 ack += ntohs(ip6->ip6_plen) + sizeof(*ip6)
865 - off - (ti.th.th_off << 2);
866 } else {
867 m_freem(*m);
868 *m = 0;
869 break;
870 }
871 seq = 0;
872 flags = TH_RST|TH_ACK;
873 }
874 bcopy(&ti, ip6, sizeof(ti));
875 tcp_respond(NULL, ip6, (struct tcphdr *)(ip6 + 1),
876 *m, ack, seq, flags, IFSCOPE_NONE, 0);
877 *m = NULL;
878 break;
879 }
880 default: /* Send an ICMP unreachable using code */
881 if (oif)
882 (*m)->m_pkthdr.rcvif = oif;
883 icmp6_error(*m, ICMP6_DST_UNREACH,
884 rule->fw_reject_code, 0);
885 *m = NULL;
886 break;
887 }
888 }
889
890 dropit:
891 /*
892 * Finally, drop the packet.
893 */
894 if (*m) {
895 m_freem(*m);
896 *m = NULL;
897 }
898 return(0);
899 }
900
901 static int
902 add_entry6(struct ip6_fw_head *chainptr, struct ip6_fw *frwl)
903 {
904 struct ip6_fw *ftmp = 0;
905 struct ip6_fw_chain *fwc = 0, *fcp, *fcpl = 0;
906 u_short nbr = 0;
907 int s;
908
909 fwc = _MALLOC(sizeof *fwc, M_IP6FW, M_WAITOK);
910 ftmp = _MALLOC(sizeof *ftmp, M_IP6FW, M_WAITOK);
911 if (!fwc || !ftmp) {
912 dprintf(("%s malloc said no\n", err_prefix));
913 if (fwc) FREE(fwc, M_IP6FW);
914 if (ftmp) FREE(ftmp, M_IP6FW);
915 return (ENOSPC);
916 }
917
918 bcopy(frwl, ftmp, sizeof(struct ip6_fw));
919 ftmp->fw_in_if.fu_via_if.name[IP6FW_IFNLEN - 1] = '\0';
920 ftmp->fw_pcnt = 0L;
921 ftmp->fw_bcnt = 0L;
922 fwc->rule = ftmp;
923
924 s = splnet();
925
926 if (!chainptr->lh_first) {
927 LIST_INSERT_HEAD(chainptr, fwc, chain);
928 splx(s);
929 return(0);
930 } else if (ftmp->fw_number == (u_short)-1) {
931 if (fwc) FREE(fwc, M_IP6FW);
932 if (ftmp) FREE(ftmp, M_IP6FW);
933 splx(s);
934 dprintf(("%s bad rule number\n", err_prefix));
935 return (EINVAL);
936 }
937
938 /* If entry number is 0, find highest numbered rule and add 100 */
939 if (ftmp->fw_number == 0) {
940 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
941 if (fcp->rule->fw_number != (u_short)-1)
942 nbr = fcp->rule->fw_number;
943 else
944 break;
945 }
946 if (nbr < (u_short)-1 - 100)
947 nbr += 100;
948 ftmp->fw_number = nbr;
949 }
950
951 /* Got a valid number; now insert it, keeping the list ordered */
952 for (fcp = chainptr->lh_first; fcp; fcp = fcp->chain.le_next) {
953 if (fcp->rule->fw_number > ftmp->fw_number) {
954 if (fcpl) {
955 LIST_INSERT_AFTER(fcpl, fwc, chain);
956 } else {
957 LIST_INSERT_HEAD(chainptr, fwc, chain);
958 }
959 break;
960 } else {
961 fcpl = fcp;
962 }
963 }
964
965 bcopy(ftmp, frwl, sizeof(struct ip6_fw));
966 splx(s);
967 return (0);
968 }
969
970 static int
971 del_entry6(struct ip6_fw_head *chainptr, u_short number)
972 {
973 struct ip6_fw_chain *fcp;
974 int s;
975
976 s = splnet();
977
978 fcp = chainptr->lh_first;
979 if (number != (u_short)-1) {
980 for (; fcp; fcp = fcp->chain.le_next) {
981 if (fcp->rule->fw_number == number) {
982 LIST_REMOVE(fcp, chain);
983 splx(s);
984 FREE(fcp->rule, M_IP6FW);
985 FREE(fcp, M_IP6FW);
986 return 0;
987 }
988 }
989 }
990
991 splx(s);
992 return (EINVAL);
993 }
994
995 static int
996 zero_entry6(struct ip6_fw *frwl)
997 {
998 struct ip6_fw_chain *fcp;
999 int s;
1000
1001 /*
1002 * It's possible to insert multiple chain entries with the
1003 * same number, so we don't stop after finding the first
1004 * match if zeroing a specific entry.
1005 */
1006 s = splnet();
1007 for (fcp = ip6_fw_chain.lh_first; fcp; fcp = fcp->chain.le_next)
1008 if (!frwl || frwl->fw_number == 0 || frwl->fw_number == fcp->rule->fw_number) {
1009 fcp->rule->fw_bcnt = fcp->rule->fw_pcnt = 0;
1010 fcp->rule->timestamp = 0;
1011 }
1012 splx(s);
1013
1014 if (fw6_verbose) {
1015 if (frwl)
1016 log(LOG_AUTHPRIV | LOG_NOTICE,
1017 "ip6fw: Entry %d cleared.\n", frwl->fw_number);
1018 else
1019 log(LOG_AUTHPRIV | LOG_NOTICE,
1020 "ip6fw: Accounting cleared.\n");
1021 }
1022
1023 return(0);
1024 }
1025
1026 static struct ip6_fw *
1027 check_ip6fw_struct(struct ip6_fw *frwl)
1028 {
1029 /* Check for invalid flag bits */
1030 if ((frwl->fw_flg & ~IPV6_FW_F_MASK) != 0) {
1031 dprintf(("%s undefined flag bits set (flags=%x)\n",
1032 err_prefix, frwl->fw_flg));
1033 return (NULL);
1034 }
1035 /* Must apply to incoming or outgoing (or both) */
1036 if (!(frwl->fw_flg & (IPV6_FW_F_IN | IPV6_FW_F_OUT))) {
1037 dprintf(("%s neither in nor out\n", err_prefix));
1038 return (NULL);
1039 }
1040 /* Empty interface name is no good */
1041 if (((frwl->fw_flg & IPV6_FW_F_IIFNAME)
1042 && !*frwl->fw_in_if.fu_via_if.name)
1043 || ((frwl->fw_flg & IPV6_FW_F_OIFNAME)
1044 && !*frwl->fw_out_if.fu_via_if.name)) {
1045 dprintf(("%s empty interface name\n", err_prefix));
1046 return (NULL);
1047 }
1048 /* Sanity check interface matching */
1049 if ((frwl->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
1050 ; /* allow "via" backwards compatibility */
1051 } else if ((frwl->fw_flg & IPV6_FW_F_IN)
1052 && (frwl->fw_flg & IPV6_FW_F_OIFACE)) {
1053 dprintf(("%s outgoing interface check on incoming\n",
1054 err_prefix));
1055 return (NULL);
1056 }
1057 /* Sanity check port ranges */
1058 if ((frwl->fw_flg & IPV6_FW_F_SRNG) && IPV6_FW_GETNSRCP(frwl) < 2) {
1059 dprintf(("%s src range set but n_src_p=%d\n",
1060 err_prefix, IPV6_FW_GETNSRCP(frwl)));
1061 return (NULL);
1062 }
1063 if ((frwl->fw_flg & IPV6_FW_F_DRNG) && IPV6_FW_GETNDSTP(frwl) < 2) {
1064 dprintf(("%s dst range set but n_dst_p=%d\n",
1065 err_prefix, IPV6_FW_GETNDSTP(frwl)));
1066 return (NULL);
1067 }
1068 if (IPV6_FW_GETNSRCP(frwl) + IPV6_FW_GETNDSTP(frwl) > IPV6_FW_MAX_PORTS) {
1069 dprintf(("%s too many ports (%d+%d)\n",
1070 err_prefix, IPV6_FW_GETNSRCP(frwl), IPV6_FW_GETNDSTP(frwl)));
1071 return (NULL);
1072 }
1073 /*
1074 * Protocols other than TCP/UDP don't use port range
1075 */
1076 if ((frwl->fw_prot != IPPROTO_TCP) &&
1077 (frwl->fw_prot != IPPROTO_UDP) &&
1078 (IPV6_FW_GETNSRCP(frwl) || IPV6_FW_GETNDSTP(frwl))) {
1079 dprintf(("%s port(s) specified for non TCP/UDP rule\n",
1080 err_prefix));
1081 return(NULL);
1082 }
1083
1084 /*
1085 * Rather than modify the entry to make such entries work,
1086 * we reject this rule and require user level utilities
1087 * to enforce whatever policy they deem appropriate.
1088 */
1089 if ((frwl->fw_src.s6_addr32[0] & (~frwl->fw_smsk.s6_addr32[0])) ||
1090 (frwl->fw_src.s6_addr32[1] & (~frwl->fw_smsk.s6_addr32[1])) ||
1091 (frwl->fw_src.s6_addr32[2] & (~frwl->fw_smsk.s6_addr32[2])) ||
1092 (frwl->fw_src.s6_addr32[3] & (~frwl->fw_smsk.s6_addr32[3])) ||
1093 (frwl->fw_dst.s6_addr32[0] & (~frwl->fw_dmsk.s6_addr32[0])) ||
1094 (frwl->fw_dst.s6_addr32[1] & (~frwl->fw_dmsk.s6_addr32[1])) ||
1095 (frwl->fw_dst.s6_addr32[2] & (~frwl->fw_dmsk.s6_addr32[2])) ||
1096 (frwl->fw_dst.s6_addr32[3] & (~frwl->fw_dmsk.s6_addr32[3]))) {
1097 dprintf(("%s rule never matches\n", err_prefix));
1098 return(NULL);
1099 }
1100
1101 if ((frwl->fw_flg & IPV6_FW_F_FRAG) &&
1102 (frwl->fw_prot == IPPROTO_UDP || frwl->fw_prot == IPPROTO_TCP)) {
1103 if (frwl->fw_nports) {
1104 dprintf(("%s cannot mix 'frag' and ports\n", err_prefix));
1105 return(NULL);
1106 }
1107 if (frwl->fw_prot == IPPROTO_TCP &&
1108 frwl->fw_tcpf != frwl->fw_tcpnf) {
1109 dprintf(("%s cannot mix 'frag' with TCP flags\n", err_prefix));
1110 return(NULL);
1111 }
1112 }
1113
1114 /* Check command specific stuff */
1115 switch (frwl->fw_flg & IPV6_FW_F_COMMAND)
1116 {
1117 case IPV6_FW_F_REJECT:
1118 if (frwl->fw_reject_code >= 0x100
1119 && !(frwl->fw_prot == IPPROTO_TCP
1120 && frwl->fw_reject_code == IPV6_FW_REJECT_RST)) {
1121 dprintf(("%s unknown reject code\n", err_prefix));
1122 return(NULL);
1123 }
1124 break;
1125 case IPV6_FW_F_DIVERT: /* Diverting to port zero is invalid */
1126 case IPV6_FW_F_TEE:
1127 if (frwl->fw_divert_port == 0) {
1128 dprintf(("%s can't divert to port 0\n", err_prefix));
1129 return (NULL);
1130 }
1131 break;
1132 case IPV6_FW_F_DENY:
1133 case IPV6_FW_F_ACCEPT:
1134 case IPV6_FW_F_COUNT:
1135 case IPV6_FW_F_SKIPTO:
1136 break;
1137 default:
1138 dprintf(("%s invalid command\n", err_prefix));
1139 return(NULL);
1140 }
1141
1142 return frwl;
1143 }
1144
1145 static void
1146 ip6fw_kev_post_msg(u_int32_t event_code)
1147 {
1148 struct kev_msg ev_msg;
1149
1150 bzero(&ev_msg, sizeof(struct kev_msg));
1151
1152 ev_msg.vendor_code = KEV_VENDOR_APPLE;
1153 ev_msg.kev_class = KEV_FIREWALL_CLASS;
1154 ev_msg.kev_subclass = KEV_IP6FW_SUBCLASS;
1155 ev_msg.event_code = event_code;
1156
1157 kev_post_msg(&ev_msg);
1158
1159 }
1160
1161
1162 static void
1163 cp_to_user_64( struct ip6_fw_64 *userrule_64, struct ip6_fw *rule)
1164 {
1165 userrule_64->version = rule->version;
1166 userrule_64->context = CAST_USER_ADDR_T(rule->context);
1167 userrule_64->fw_pcnt = rule->fw_pcnt;
1168 userrule_64->fw_bcnt = rule->fw_bcnt;
1169 userrule_64->fw_src = rule->fw_src;
1170 userrule_64->fw_dst = rule->fw_dst;
1171 userrule_64->fw_smsk = rule->fw_smsk;
1172 userrule_64->fw_dmsk = rule->fw_dmsk;
1173 userrule_64->fw_number = rule->fw_number;
1174 userrule_64->fw_flg = rule->fw_flg;
1175 userrule_64->fw_ipflg = rule->fw_ipflg;
1176 bcopy( rule->fw_pts, userrule_64->fw_pts, IPV6_FW_MAX_PORTS);
1177 userrule_64->fw_ip6opt= rule->fw_ip6opt;
1178 userrule_64->fw_ip6nopt = rule->fw_ip6nopt;
1179 userrule_64->fw_tcpf = rule->fw_tcpf;
1180 userrule_64->fw_tcpnf = rule->fw_tcpnf;
1181 bcopy( rule->fw_icmp6types, userrule_64->fw_icmp6types, sizeof(userrule_64->fw_icmp6types));
1182 userrule_64->fw_in_if = rule->fw_in_if;
1183 userrule_64->fw_out_if = rule->fw_out_if;
1184 userrule_64->timestamp = rule->timestamp;
1185 userrule_64->fw_un.fu_divert_port = rule->fw_un.fu_divert_port;
1186 userrule_64->fw_prot = rule->fw_prot;
1187 userrule_64->fw_nports = rule->fw_nports;
1188 }
1189
1190
1191 static void
1192 cp_from_user_64( struct ip6_fw_64 *userrule_64, struct ip6_fw *rule)
1193 {
1194 rule->version = userrule_64->version;
1195 rule->context = CAST_DOWN(void *, userrule_64->context);
1196 rule->fw_pcnt = userrule_64->fw_pcnt;
1197 rule->fw_bcnt = userrule_64->fw_bcnt;
1198 rule->fw_src = userrule_64->fw_src;
1199 rule->fw_dst = userrule_64->fw_dst;
1200 rule->fw_smsk = userrule_64->fw_smsk;
1201 rule->fw_dmsk = userrule_64->fw_dmsk;
1202 rule->fw_number = userrule_64->fw_number;
1203 rule->fw_flg = userrule_64->fw_flg;
1204 rule->fw_ipflg = userrule_64->fw_ipflg;
1205 bcopy( userrule_64->fw_pts, rule->fw_pts, IPV6_FW_MAX_PORTS);
1206 rule->fw_ip6opt = userrule_64->fw_ip6opt;
1207 rule->fw_ip6nopt = userrule_64->fw_ip6nopt;
1208 rule->fw_tcpf = userrule_64->fw_tcpf;
1209 rule->fw_tcpnf = userrule_64->fw_tcpnf;
1210 bcopy( userrule_64->fw_icmp6types, rule->fw_icmp6types, sizeof(userrule_64->fw_icmp6types));
1211 rule->fw_in_if = userrule_64->fw_in_if;
1212 rule->fw_out_if = userrule_64->fw_out_if;
1213 rule->timestamp = CAST_DOWN( long, userrule_64->timestamp);
1214 rule->fw_un.fu_divert_port = userrule_64->fw_un.fu_divert_port;
1215 rule->fw_prot = userrule_64->fw_prot;
1216 rule->fw_nports = userrule_64->fw_nports;
1217 }
1218
1219
1220 static void
1221 cp_to_user_32( struct ip6_fw_32 *userrule_32, struct ip6_fw *rule)
1222 {
1223 userrule_32->version = rule->version;
1224 userrule_32->context = CAST_DOWN_EXPLICIT( user32_addr_t, rule->context);
1225 userrule_32->fw_pcnt = rule->fw_pcnt;
1226 userrule_32->fw_bcnt = rule->fw_bcnt;
1227 userrule_32->fw_src = rule->fw_src;
1228 userrule_32->fw_dst = rule->fw_dst;
1229 userrule_32->fw_smsk = rule->fw_smsk;
1230 userrule_32->fw_dmsk = rule->fw_dmsk;
1231 userrule_32->fw_number = rule->fw_number;
1232 userrule_32->fw_flg = rule->fw_flg;
1233 userrule_32->fw_ipflg = rule->fw_ipflg;
1234 bcopy( rule->fw_pts, userrule_32->fw_pts, IPV6_FW_MAX_PORTS);
1235 userrule_32->fw_ip6opt = rule->fw_ip6opt ;
1236 userrule_32->fw_ip6nopt = rule->fw_ip6nopt;
1237 userrule_32->fw_tcpf = rule->fw_tcpf;
1238 userrule_32->fw_tcpnf = rule->fw_tcpnf;
1239 bcopy( rule->fw_icmp6types, userrule_32->fw_icmp6types, sizeof(rule->fw_icmp6types));
1240 userrule_32->fw_in_if = rule->fw_in_if;
1241 userrule_32->fw_out_if = rule->fw_out_if;
1242 userrule_32->timestamp = rule->timestamp;
1243 userrule_32->fw_un.fu_divert_port = rule->fw_un.fu_divert_port;
1244 userrule_32->fw_prot = rule->fw_prot;
1245 userrule_32->fw_nports = rule->fw_nports;
1246 }
1247
1248
1249 static void
1250 cp_from_user_32( struct ip6_fw_32 *userrule_32, struct ip6_fw *rule)
1251 {
1252 rule->version = userrule_32->version;
1253 rule->context = CAST_DOWN(void *, userrule_32->context);
1254 rule->fw_pcnt = userrule_32->fw_pcnt;
1255 rule->fw_bcnt = userrule_32->fw_bcnt;
1256 rule->fw_src = userrule_32->fw_src;
1257 rule->fw_dst = userrule_32->fw_dst;
1258 rule->fw_smsk = userrule_32->fw_smsk;
1259 rule->fw_dmsk = userrule_32->fw_dmsk;
1260 rule->fw_number = userrule_32->fw_number;
1261 rule->fw_flg = userrule_32->fw_flg;
1262 rule->fw_ipflg = userrule_32->fw_ipflg;
1263 bcopy( userrule_32->fw_pts, rule->fw_pts, IPV6_FW_MAX_PORTS);
1264 rule->fw_ip6opt = userrule_32->fw_ip6opt;
1265 rule->fw_ip6nopt = userrule_32->fw_ip6nopt;
1266 rule->fw_tcpf = userrule_32->fw_tcpf;
1267 rule->fw_tcpnf = userrule_32->fw_tcpnf;
1268 bcopy( userrule_32->fw_icmp6types, rule->fw_icmp6types, sizeof(userrule_32->fw_icmp6types));
1269 rule->fw_in_if = userrule_32->fw_in_if;
1270 rule->fw_out_if = userrule_32->fw_out_if;
1271 rule->timestamp = CAST_DOWN(long, userrule_32->timestamp);
1272 rule->fw_un.fu_divert_port = userrule_32->fw_un.fu_divert_port;
1273 rule->fw_prot = userrule_32->fw_prot;
1274 rule->fw_nports = userrule_32->fw_nports;
1275 }
1276
1277 static int
1278 ip6_fw_ctl(struct sockopt *sopt)
1279 {
1280 int error = 0;
1281 int spl;
1282 int valsize;
1283 struct ip6_fw rule;
1284 int is64user=0;
1285 size_t userrulesize;
1286
1287 if (securelevel >= 3 &&
1288 (sopt->sopt_dir != SOPT_GET || sopt->sopt_name != IPV6_FW_GET))
1289 return (EPERM);
1290
1291 if ( proc_is64bit(sopt->sopt_p) ){
1292 is64user = 1;
1293 userrulesize = sizeof( struct ip6_fw_64 );
1294 } else
1295 userrulesize = sizeof( struct ip6_fw_32 );
1296
1297 /* We ALWAYS expect the client to pass in a rule structure so that we can
1298 * check the version of the API that they are using. In the case of a
1299 * IPV6_FW_GET operation, the first rule of the output buffer passed to us
1300 * must have the version set. */
1301 if (!sopt->sopt_val || sopt->sopt_valsize < userrulesize) return EINVAL;
1302
1303 /* save sopt->sopt_valsize */
1304 valsize = sopt->sopt_valsize;
1305
1306 if (is64user){
1307 struct ip6_fw_64 userrule_64;
1308
1309 if ((error = sooptcopyin(sopt, &userrule_64, userrulesize, userrulesize)))
1310 return error;
1311
1312 cp_from_user_64( &userrule_64, &rule );
1313 }
1314 else {
1315 struct ip6_fw_32 userrule_32;
1316
1317 if ((error = sooptcopyin(sopt, &userrule_32, userrulesize, userrulesize)))
1318 return error;
1319
1320 cp_from_user_32( &userrule_32, &rule );
1321 }
1322
1323 if (rule.version != IPV6_FW_CURRENT_API_VERSION) return EINVAL;
1324 rule.version = 0xFFFFFFFF; /* version is meaningless once rules "make it in the door". */
1325
1326 switch (sopt->sopt_name)
1327 {
1328 case IPV6_FW_GET:
1329 {
1330 struct ip6_fw_chain *fcp;
1331 struct ip6_fw *buf;
1332 size_t size = 0;
1333 size_t rulesize = 0;
1334
1335 spl = splnet();
1336
1337 if ( is64user )
1338 rulesize = sizeof(struct ip6_fw_64 );
1339 else
1340 rulesize = sizeof(struct ip6_fw_32 );
1341
1342 LIST_FOREACH(fcp, &ip6_fw_chain, chain)
1343 size += rulesize;
1344
1345 buf = _MALLOC(size, M_TEMP, M_WAITOK);
1346 if (!buf) error = ENOBUFS;
1347 else
1348 {
1349 //struct ip6_fw *bp = buf;
1350 caddr_t bp = (caddr_t)buf;
1351
1352 LIST_FOREACH(fcp, &ip6_fw_chain, chain)
1353 {
1354 //bcopy(fcp->rule, bp, sizeof *bp);
1355 if ( is64user ){
1356 cp_to_user_64( (struct ip6_fw_64*)bp, fcp->rule);
1357 }
1358 else {
1359 cp_to_user_32( (struct ip6_fw_32*)bp, fcp->rule);
1360 }
1361
1362 ( (struct ip6_fw*)bp)->version = IPV6_FW_CURRENT_API_VERSION;
1363 //bp++;
1364 bp += rulesize;
1365 }
1366 }
1367
1368 splx(spl);
1369 if (buf)
1370 {
1371 sopt->sopt_valsize = valsize;
1372 error = sooptcopyout(sopt, buf, size);
1373 FREE(buf, M_TEMP);
1374 }
1375
1376 break;
1377 }
1378
1379 case IPV6_FW_FLUSH:
1380 spl = splnet();
1381 while (ip6_fw_chain.lh_first &&
1382 ip6_fw_chain.lh_first->rule->fw_number != (u_short)-1)
1383 {
1384 struct ip6_fw_chain *fcp = ip6_fw_chain.lh_first;
1385 LIST_REMOVE(ip6_fw_chain.lh_first, chain);
1386 FREE(fcp->rule, M_IP6FW);
1387 FREE(fcp, M_IP6FW);
1388 }
1389 splx(spl);
1390 ip6fw_kev_post_msg(KEV_IP6FW_FLUSH);
1391 break;
1392
1393 case IPV6_FW_ZERO:
1394 error = zero_entry6(&rule);
1395 break;
1396
1397 case IPV6_FW_ADD:
1398 if (check_ip6fw_struct(&rule)) {
1399 error = add_entry6(&ip6_fw_chain, &rule);
1400
1401 ip6fw_kev_post_msg(KEV_IP6FW_ADD);
1402 } else
1403 error = EINVAL;
1404
1405 if (is64user){
1406 struct ip6_fw_64 userrule_64;
1407 cp_to_user_64( &userrule_64, &rule);
1408 error = sooptcopyout(sopt, &userrule_64, userrulesize);
1409 }
1410 else {
1411 struct ip6_fw_32 userrule_32;
1412 cp_to_user_32( &userrule_32, &rule);
1413 error = sooptcopyout(sopt, &userrule_32, userrulesize);
1414 }
1415 break;
1416
1417 case IPV6_FW_DEL:
1418 if (rule.fw_number == (u_short)-1)
1419 {
1420 dprintf(("%s can't delete rule 65535\n", err_prefix));
1421 error = EINVAL;
1422 }
1423 else {
1424 error = del_entry6(&ip6_fw_chain, rule.fw_number);
1425
1426 ip6fw_kev_post_msg(KEV_IP6FW_DEL);
1427 }
1428 break;
1429
1430 default:
1431 dprintf(("%s invalid option %d\n", err_prefix, sopt->sopt_name));
1432 error = EINVAL;
1433 }
1434
1435 return error;
1436 }
1437
1438 void
1439 ip6_fw_init(void)
1440 {
1441 struct ip6_fw default_rule;
1442
1443 ip6_fw_chk_ptr = ip6_fw_chk;
1444 ip6_fw_ctl_ptr = ip6_fw_ctl;
1445 LIST_INIT(&ip6_fw_chain);
1446
1447 bzero(&default_rule, sizeof default_rule);
1448 default_rule.fw_prot = IPPROTO_IPV6;
1449 default_rule.fw_number = (u_short)-1;
1450 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1451 default_rule.fw_flg |= IPV6_FW_F_ACCEPT;
1452 #else
1453 default_rule.fw_flg |= IPV6_FW_F_DENY;
1454 #endif
1455 default_rule.fw_flg |= IPV6_FW_F_IN | IPV6_FW_F_OUT;
1456 if (check_ip6fw_struct(&default_rule) == NULL ||
1457 add_entry6(&ip6_fw_chain, &default_rule))
1458 panic("%s", __FUNCTION__);
1459
1460 printf("IPv6 packet filtering initialized, ");
1461 #ifdef IPV6FIREWALL_DEFAULT_TO_ACCEPT
1462 printf("default to accept, ");
1463 #endif
1464 #ifndef IPV6FIREWALL_VERBOSE
1465 printf("logging disabled\n");
1466 #else
1467 if (fw6_verbose_limit == 0)
1468 printf("unlimited logging\n");
1469 else
1470 printf("logging limited to %d packets/entry\n",
1471 fw6_verbose_limit);
1472 #endif
1473 }
1474
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