1 /*-
2 * Copyright (c) 2001 Daniel Hartmeier
3 * Copyright (c) 2003 Cedric Berger
4 * Copyright (c) 2005 Henning Brauer <henning@openbsd.org>
5 * Copyright (c) 2005 Ryan McBride <mcbride@openbsd.org>
6 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
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 *
13 * - Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * - Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer in the documentation and/or other materials provided
18 * with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 *
33 * $OpenBSD: pf_if.c,v 1.54 2008/06/14 16:55:28 mk Exp $
34 */
35
36 #include <sys/cdefs.h>
37 __FBSDID("$FreeBSD$");
38
39 #include "opt_inet.h"
40 #include "opt_inet6.h"
41
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/eventhandler.h>
45 #include <sys/lock.h>
46 #include <sys/mbuf.h>
47 #include <sys/socket.h>
48
49 #include <net/if.h>
50 #include <net/if_var.h>
51 #include <net/vnet.h>
52 #include <net/pfvar.h>
53 #include <net/route.h>
54
55 VNET_DEFINE(struct pfi_kif *, pfi_all);
56 static VNET_DEFINE(long, pfi_update);
57 #define V_pfi_update VNET(pfi_update)
58 #define PFI_BUFFER_MAX 0x10000
59
60 VNET_DECLARE(int, pf_vnet_active);
61 #define V_pf_vnet_active VNET(pf_vnet_active)
62
63 static VNET_DEFINE(struct pfr_addr *, pfi_buffer);
64 static VNET_DEFINE(int, pfi_buffer_cnt);
65 static VNET_DEFINE(int, pfi_buffer_max);
66 #define V_pfi_buffer VNET(pfi_buffer)
67 #define V_pfi_buffer_cnt VNET(pfi_buffer_cnt)
68 #define V_pfi_buffer_max VNET(pfi_buffer_max)
69
70 eventhandler_tag pfi_attach_cookie;
71 eventhandler_tag pfi_detach_cookie;
72 eventhandler_tag pfi_attach_group_cookie;
73 eventhandler_tag pfi_change_group_cookie;
74 eventhandler_tag pfi_detach_group_cookie;
75 eventhandler_tag pfi_ifaddr_event_cookie;
76
77 static void pfi_attach_ifnet(struct ifnet *);
78 static void pfi_attach_ifgroup(struct ifg_group *);
79
80 static void pfi_kif_update(struct pfi_kif *);
81 static void pfi_dynaddr_update(struct pfi_dynaddr *dyn);
82 static void pfi_table_update(struct pfr_ktable *, struct pfi_kif *, int,
83 int);
84 static void pfi_instance_add(struct ifnet *, int, int);
85 static void pfi_address_add(struct sockaddr *, int, int);
86 static int pfi_if_compare(struct pfi_kif *, struct pfi_kif *);
87 static int pfi_skip_if(const char *, struct pfi_kif *);
88 static int pfi_unmask(void *);
89 static void pfi_attach_ifnet_event(void * __unused, struct ifnet *);
90 static void pfi_detach_ifnet_event(void * __unused, struct ifnet *);
91 static void pfi_attach_group_event(void *, struct ifg_group *);
92 static void pfi_change_group_event(void *, char *);
93 static void pfi_detach_group_event(void *, struct ifg_group *);
94 static void pfi_ifaddr_event(void * __unused, struct ifnet *);
95
96 RB_HEAD(pfi_ifhead, pfi_kif);
97 static RB_PROTOTYPE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
98 static RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
99 static VNET_DEFINE(struct pfi_ifhead, pfi_ifs);
100 #define V_pfi_ifs VNET(pfi_ifs)
101
102 #define PFI_BUFFER_MAX 0x10000
103 MALLOC_DEFINE(PFI_MTYPE, "pf_ifnet", "pf(4) interface database");
104
105 LIST_HEAD(pfi_list, pfi_kif);
106 static VNET_DEFINE(struct pfi_list, pfi_unlinked_kifs);
107 #define V_pfi_unlinked_kifs VNET(pfi_unlinked_kifs)
108 static struct mtx pfi_unlnkdkifs_mtx;
109 MTX_SYSINIT(pfi_unlnkdkifs_mtx, &pfi_unlnkdkifs_mtx, "pf unlinked interfaces",
110 MTX_DEF);
111
112 void
pfi_initialize_vnet(void)113 pfi_initialize_vnet(void)
114 {
115 struct ifg_group *ifg;
116 struct ifnet *ifp;
117 struct pfi_kif *kif;
118
119 V_pfi_buffer_max = 64;
120 V_pfi_buffer = malloc(V_pfi_buffer_max * sizeof(*V_pfi_buffer),
121 PFI_MTYPE, M_WAITOK);
122
123 kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
124 PF_RULES_WLOCK();
125 V_pfi_all = pfi_kif_attach(kif, IFG_ALL);
126 PF_RULES_WUNLOCK();
127
128 IFNET_RLOCK();
129 TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
130 pfi_attach_ifgroup(ifg);
131 TAILQ_FOREACH(ifp, &V_ifnet, if_link)
132 pfi_attach_ifnet(ifp);
133 IFNET_RUNLOCK();
134 }
135
136 void
pfi_initialize(void)137 pfi_initialize(void)
138 {
139
140 pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_arrival_event,
141 pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
142 pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_departure_event,
143 pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
144 pfi_attach_group_cookie = EVENTHANDLER_REGISTER(group_attach_event,
145 pfi_attach_group_event, curvnet, EVENTHANDLER_PRI_ANY);
146 pfi_change_group_cookie = EVENTHANDLER_REGISTER(group_change_event,
147 pfi_change_group_event, curvnet, EVENTHANDLER_PRI_ANY);
148 pfi_detach_group_cookie = EVENTHANDLER_REGISTER(group_detach_event,
149 pfi_detach_group_event, curvnet, EVENTHANDLER_PRI_ANY);
150 pfi_ifaddr_event_cookie = EVENTHANDLER_REGISTER(ifaddr_event,
151 pfi_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY);
152 }
153
154 void
pfi_cleanup_vnet(void)155 pfi_cleanup_vnet(void)
156 {
157 struct pfi_kif *kif;
158
159 PF_RULES_WASSERT();
160
161 V_pfi_all = NULL;
162 while ((kif = RB_MIN(pfi_ifhead, &V_pfi_ifs))) {
163 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
164 if (kif->pfik_group)
165 kif->pfik_group->ifg_pf_kif = NULL;
166 if (kif->pfik_ifp) {
167 if_rele(kif->pfik_ifp);
168 kif->pfik_ifp->if_pf_kif = NULL;
169 }
170 free(kif, PFI_MTYPE);
171 }
172
173 mtx_lock(&pfi_unlnkdkifs_mtx);
174 while ((kif = LIST_FIRST(&V_pfi_unlinked_kifs))) {
175 LIST_REMOVE(kif, pfik_list);
176 free(kif, PFI_MTYPE);
177 }
178 mtx_unlock(&pfi_unlnkdkifs_mtx);
179
180 free(V_pfi_buffer, PFI_MTYPE);
181 }
182
183 void
pfi_cleanup(void)184 pfi_cleanup(void)
185 {
186
187 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, pfi_attach_cookie);
188 EVENTHANDLER_DEREGISTER(ifnet_departure_event, pfi_detach_cookie);
189 EVENTHANDLER_DEREGISTER(group_attach_event, pfi_attach_group_cookie);
190 EVENTHANDLER_DEREGISTER(group_change_event, pfi_change_group_cookie);
191 EVENTHANDLER_DEREGISTER(group_detach_event, pfi_detach_group_cookie);
192 EVENTHANDLER_DEREGISTER(ifaddr_event, pfi_ifaddr_event_cookie);
193 }
194
195 struct pfi_kif *
pfi_kif_find(const char * kif_name)196 pfi_kif_find(const char *kif_name)
197 {
198 struct pfi_kif_cmp s;
199
200 PF_RULES_ASSERT();
201
202 bzero(&s, sizeof(s));
203 strlcpy(s.pfik_name, kif_name, sizeof(s.pfik_name));
204
205 return (RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kif *)&s));
206 }
207
208 struct pfi_kif *
pfi_kif_attach(struct pfi_kif * kif,const char * kif_name)209 pfi_kif_attach(struct pfi_kif *kif, const char *kif_name)
210 {
211 struct pfi_kif *kif1;
212
213 PF_RULES_WASSERT();
214 KASSERT(kif != NULL, ("%s: null kif", __func__));
215
216 kif1 = pfi_kif_find(kif_name);
217 if (kif1 != NULL) {
218 free(kif, PFI_MTYPE);
219 return (kif1);
220 }
221
222 bzero(kif, sizeof(*kif));
223 strlcpy(kif->pfik_name, kif_name, sizeof(kif->pfik_name));
224 /*
225 * It seems that the value of time_second is in unintialzied state
226 * when pf sets interface statistics clear time in boot phase if pf
227 * was statically linked to kernel. Instead of setting the bogus
228 * time value have pfi_get_ifaces handle this case. In
229 * pfi_get_ifaces it uses time_second if it sees the time is 0.
230 */
231 kif->pfik_tzero = time_second > 1 ? time_second : 0;
232 TAILQ_INIT(&kif->pfik_dynaddrs);
233
234 RB_INSERT(pfi_ifhead, &V_pfi_ifs, kif);
235
236 return (kif);
237 }
238
239 void
pfi_kif_ref(struct pfi_kif * kif)240 pfi_kif_ref(struct pfi_kif *kif)
241 {
242
243 PF_RULES_WASSERT();
244 kif->pfik_rulerefs++;
245 }
246
247 void
pfi_kif_unref(struct pfi_kif * kif)248 pfi_kif_unref(struct pfi_kif *kif)
249 {
250
251 PF_RULES_WASSERT();
252 KASSERT(kif->pfik_rulerefs > 0, ("%s: %p has zero refs", __func__, kif));
253
254 kif->pfik_rulerefs--;
255
256 if (kif->pfik_rulerefs > 0)
257 return;
258
259 /* kif referencing an existing ifnet or group should exist. */
260 if (kif->pfik_ifp != NULL || kif->pfik_group != NULL || kif == V_pfi_all)
261 return;
262
263 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
264
265 kif->pfik_flags |= PFI_IFLAG_REFS;
266
267 mtx_lock(&pfi_unlnkdkifs_mtx);
268 LIST_INSERT_HEAD(&V_pfi_unlinked_kifs, kif, pfik_list);
269 mtx_unlock(&pfi_unlnkdkifs_mtx);
270 }
271
272 void
pfi_kif_purge(void)273 pfi_kif_purge(void)
274 {
275 struct pfi_kif *kif, *kif1;
276
277 /*
278 * Do naive mark-and-sweep garbage collecting of old kifs.
279 * Reference flag is raised by pf_purge_expired_states().
280 */
281 mtx_lock(&pfi_unlnkdkifs_mtx);
282 LIST_FOREACH_SAFE(kif, &V_pfi_unlinked_kifs, pfik_list, kif1) {
283 if (!(kif->pfik_flags & PFI_IFLAG_REFS)) {
284 LIST_REMOVE(kif, pfik_list);
285 free(kif, PFI_MTYPE);
286 } else
287 kif->pfik_flags &= ~PFI_IFLAG_REFS;
288 }
289 mtx_unlock(&pfi_unlnkdkifs_mtx);
290 }
291
292 int
pfi_kif_match(struct pfi_kif * rule_kif,struct pfi_kif * packet_kif)293 pfi_kif_match(struct pfi_kif *rule_kif, struct pfi_kif *packet_kif)
294 {
295 struct ifg_list *p;
296
297 if (rule_kif == NULL || rule_kif == packet_kif)
298 return (1);
299
300 if (rule_kif->pfik_group != NULL)
301 /* XXXGL: locking? */
302 TAILQ_FOREACH(p, &packet_kif->pfik_ifp->if_groups, ifgl_next)
303 if (p->ifgl_group == rule_kif->pfik_group)
304 return (1);
305
306 return (0);
307 }
308
309 static void
pfi_attach_ifnet(struct ifnet * ifp)310 pfi_attach_ifnet(struct ifnet *ifp)
311 {
312 struct pfi_kif *kif;
313
314 kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
315
316 PF_RULES_WLOCK();
317 V_pfi_update++;
318 kif = pfi_kif_attach(kif, ifp->if_xname);
319
320 if_ref(ifp);
321
322 kif->pfik_ifp = ifp;
323 ifp->if_pf_kif = kif;
324
325 pfi_kif_update(kif);
326 PF_RULES_WUNLOCK();
327 }
328
329 static void
pfi_attach_ifgroup(struct ifg_group * ifg)330 pfi_attach_ifgroup(struct ifg_group *ifg)
331 {
332 struct pfi_kif *kif;
333
334 kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
335
336 PF_RULES_WLOCK();
337 V_pfi_update++;
338 kif = pfi_kif_attach(kif, ifg->ifg_group);
339
340 kif->pfik_group = ifg;
341 ifg->ifg_pf_kif = kif;
342 PF_RULES_WUNLOCK();
343 }
344
345 int
pfi_match_addr(struct pfi_dynaddr * dyn,struct pf_addr * a,sa_family_t af)346 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af)
347 {
348 switch (af) {
349 #ifdef INET
350 case AF_INET:
351 switch (dyn->pfid_acnt4) {
352 case 0:
353 return (0);
354 case 1:
355 return (PF_MATCHA(0, &dyn->pfid_addr4,
356 &dyn->pfid_mask4, a, AF_INET));
357 default:
358 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET));
359 }
360 break;
361 #endif /* INET */
362 #ifdef INET6
363 case AF_INET6:
364 switch (dyn->pfid_acnt6) {
365 case 0:
366 return (0);
367 case 1:
368 return (PF_MATCHA(0, &dyn->pfid_addr6,
369 &dyn->pfid_mask6, a, AF_INET6));
370 default:
371 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6));
372 }
373 break;
374 #endif /* INET6 */
375 default:
376 return (0);
377 }
378 }
379
380 int
pfi_dynaddr_setup(struct pf_addr_wrap * aw,sa_family_t af)381 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
382 {
383 struct pfi_dynaddr *dyn;
384 char tblname[PF_TABLE_NAME_SIZE];
385 struct pf_ruleset *ruleset = NULL;
386 struct pfi_kif *kif;
387 int rv = 0;
388
389 PF_RULES_WASSERT();
390 KASSERT(aw->type == PF_ADDR_DYNIFTL, ("%s: type %u",
391 __func__, aw->type));
392 KASSERT(aw->p.dyn == NULL, ("%s: dyn is %p", __func__, aw->p.dyn));
393
394 if ((dyn = malloc(sizeof(*dyn), PFI_MTYPE, M_NOWAIT | M_ZERO)) == NULL)
395 return (ENOMEM);
396
397 if ((kif = malloc(sizeof(*kif), PFI_MTYPE, M_NOWAIT)) == NULL) {
398 free(dyn, PFI_MTYPE);
399 return (ENOMEM);
400 }
401
402 if (!strcmp(aw->v.ifname, "self"))
403 dyn->pfid_kif = pfi_kif_attach(kif, IFG_ALL);
404 else
405 dyn->pfid_kif = pfi_kif_attach(kif, aw->v.ifname);
406 pfi_kif_ref(dyn->pfid_kif);
407
408 dyn->pfid_net = pfi_unmask(&aw->v.a.mask);
409 if (af == AF_INET && dyn->pfid_net == 32)
410 dyn->pfid_net = 128;
411 strlcpy(tblname, aw->v.ifname, sizeof(tblname));
412 if (aw->iflags & PFI_AFLAG_NETWORK)
413 strlcat(tblname, ":network", sizeof(tblname));
414 if (aw->iflags & PFI_AFLAG_BROADCAST)
415 strlcat(tblname, ":broadcast", sizeof(tblname));
416 if (aw->iflags & PFI_AFLAG_PEER)
417 strlcat(tblname, ":peer", sizeof(tblname));
418 if (aw->iflags & PFI_AFLAG_NOALIAS)
419 strlcat(tblname, ":0", sizeof(tblname));
420 if (dyn->pfid_net != 128)
421 snprintf(tblname + strlen(tblname),
422 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net);
423 if ((ruleset = pf_find_or_create_ruleset(PF_RESERVED_ANCHOR)) == NULL) {
424 rv = ENOMEM;
425 goto _bad;
426 }
427
428 if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) {
429 rv = ENOMEM;
430 goto _bad;
431 }
432
433 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE;
434 dyn->pfid_iflags = aw->iflags;
435 dyn->pfid_af = af;
436
437 TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
438 aw->p.dyn = dyn;
439 pfi_kif_update(dyn->pfid_kif);
440
441 return (0);
442
443 _bad:
444 if (dyn->pfid_kt != NULL)
445 pfr_detach_table(dyn->pfid_kt);
446 if (ruleset != NULL)
447 pf_remove_if_empty_ruleset(ruleset);
448 if (dyn->pfid_kif != NULL)
449 pfi_kif_unref(dyn->pfid_kif);
450 free(dyn, PFI_MTYPE);
451
452 return (rv);
453 }
454
455 static void
pfi_kif_update(struct pfi_kif * kif)456 pfi_kif_update(struct pfi_kif *kif)
457 {
458 struct ifg_list *ifgl;
459 struct pfi_dynaddr *p;
460
461 PF_RULES_WASSERT();
462
463 /* update all dynaddr */
464 TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry)
465 pfi_dynaddr_update(p);
466
467 /* again for all groups kif is member of */
468 if (kif->pfik_ifp != NULL) {
469 IF_ADDR_RLOCK(kif->pfik_ifp);
470 TAILQ_FOREACH(ifgl, &kif->pfik_ifp->if_groups, ifgl_next)
471 pfi_kif_update((struct pfi_kif *)
472 ifgl->ifgl_group->ifg_pf_kif);
473 IF_ADDR_RUNLOCK(kif->pfik_ifp);
474 }
475 }
476
477 static void
pfi_dynaddr_update(struct pfi_dynaddr * dyn)478 pfi_dynaddr_update(struct pfi_dynaddr *dyn)
479 {
480 struct pfi_kif *kif;
481 struct pfr_ktable *kt;
482
483 PF_RULES_WASSERT();
484 KASSERT(dyn && dyn->pfid_kif && dyn->pfid_kt,
485 ("%s: bad argument", __func__));
486
487 kif = dyn->pfid_kif;
488 kt = dyn->pfid_kt;
489
490 if (kt->pfrkt_larg != V_pfi_update) {
491 /* this table needs to be brought up-to-date */
492 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags);
493 kt->pfrkt_larg = V_pfi_update;
494 }
495 pfr_dynaddr_update(kt, dyn);
496 }
497
498 static void
pfi_table_update(struct pfr_ktable * kt,struct pfi_kif * kif,int net,int flags)499 pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags)
500 {
501 int e, size2 = 0;
502 struct ifg_member *ifgm;
503
504 V_pfi_buffer_cnt = 0;
505
506 if (kif->pfik_ifp != NULL)
507 pfi_instance_add(kif->pfik_ifp, net, flags);
508 else if (kif->pfik_group != NULL) {
509 IFNET_RLOCK_NOSLEEP();
510 TAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, ifgm_next)
511 pfi_instance_add(ifgm->ifgm_ifp, net, flags);
512 IFNET_RUNLOCK_NOSLEEP();
513 }
514
515 if ((e = pfr_set_addrs(&kt->pfrkt_t, V_pfi_buffer, V_pfi_buffer_cnt, &size2,
516 NULL, NULL, NULL, 0, PFR_TFLAG_ALLMASK)))
517 printf("%s: cannot set %d new addresses into table %s: %d\n",
518 __func__, V_pfi_buffer_cnt, kt->pfrkt_name, e);
519 }
520
521 static void
pfi_instance_add(struct ifnet * ifp,int net,int flags)522 pfi_instance_add(struct ifnet *ifp, int net, int flags)
523 {
524 struct ifaddr *ia;
525 int got4 = 0, got6 = 0;
526 int net2, af;
527
528 IF_ADDR_RLOCK(ifp);
529 TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_list) {
530 if (ia->ifa_addr == NULL)
531 continue;
532 af = ia->ifa_addr->sa_family;
533 if (af != AF_INET && af != AF_INET6)
534 continue;
535 /*
536 * XXX: For point-to-point interfaces, (ifname:0) and IPv4,
537 * jump over addresses without a proper route to work
538 * around a problem with ppp not fully removing the
539 * address used during IPCP.
540 */
541 if ((ifp->if_flags & IFF_POINTOPOINT) &&
542 !(ia->ifa_flags & IFA_ROUTE) &&
543 (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET))
544 continue;
545 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6)
546 continue;
547 if ((flags & PFI_AFLAG_BROADCAST) &&
548 !(ifp->if_flags & IFF_BROADCAST))
549 continue;
550 if ((flags & PFI_AFLAG_PEER) &&
551 !(ifp->if_flags & IFF_POINTOPOINT))
552 continue;
553 if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 &&
554 IN6_IS_ADDR_LINKLOCAL(
555 &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr))
556 continue;
557 if (flags & PFI_AFLAG_NOALIAS) {
558 if (af == AF_INET && got4)
559 continue;
560 if (af == AF_INET6 && got6)
561 continue;
562 }
563 if (af == AF_INET)
564 got4 = 1;
565 else if (af == AF_INET6)
566 got6 = 1;
567 net2 = net;
568 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) {
569 if (af == AF_INET)
570 net2 = pfi_unmask(&((struct sockaddr_in *)
571 ia->ifa_netmask)->sin_addr);
572 else if (af == AF_INET6)
573 net2 = pfi_unmask(&((struct sockaddr_in6 *)
574 ia->ifa_netmask)->sin6_addr);
575 }
576 if (af == AF_INET && net2 > 32)
577 net2 = 32;
578 if (flags & PFI_AFLAG_BROADCAST)
579 pfi_address_add(ia->ifa_broadaddr, af, net2);
580 else if (flags & PFI_AFLAG_PEER)
581 pfi_address_add(ia->ifa_dstaddr, af, net2);
582 else
583 pfi_address_add(ia->ifa_addr, af, net2);
584 }
585 IF_ADDR_RUNLOCK(ifp);
586 }
587
588 static void
pfi_address_add(struct sockaddr * sa,int af,int net)589 pfi_address_add(struct sockaddr *sa, int af, int net)
590 {
591 struct pfr_addr *p;
592 int i;
593
594 if (V_pfi_buffer_cnt >= V_pfi_buffer_max) {
595 int new_max = V_pfi_buffer_max * 2;
596
597 if (new_max > PFI_BUFFER_MAX) {
598 printf("%s: address buffer full (%d/%d)\n", __func__,
599 V_pfi_buffer_cnt, PFI_BUFFER_MAX);
600 return;
601 }
602 p = malloc(new_max * sizeof(*V_pfi_buffer), PFI_MTYPE,
603 M_NOWAIT);
604 if (p == NULL) {
605 printf("%s: no memory to grow buffer (%d/%d)\n",
606 __func__, V_pfi_buffer_cnt, PFI_BUFFER_MAX);
607 return;
608 }
609 memcpy(p, V_pfi_buffer, V_pfi_buffer_max * sizeof(*V_pfi_buffer));
610 /* no need to zero buffer */
611 free(V_pfi_buffer, PFI_MTYPE);
612 V_pfi_buffer = p;
613 V_pfi_buffer_max = new_max;
614 }
615 if (af == AF_INET && net > 32)
616 net = 128;
617 p = V_pfi_buffer + V_pfi_buffer_cnt++;
618 bzero(p, sizeof(*p));
619 p->pfra_af = af;
620 p->pfra_net = net;
621 if (af == AF_INET)
622 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr;
623 else if (af == AF_INET6) {
624 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr;
625 if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr))
626 p->pfra_ip6addr.s6_addr16[1] = 0;
627 }
628 /* mask network address bits */
629 if (net < 128)
630 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8));
631 for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++)
632 ((caddr_t)p)[i] = 0;
633 }
634
635 void
pfi_dynaddr_remove(struct pfi_dynaddr * dyn)636 pfi_dynaddr_remove(struct pfi_dynaddr *dyn)
637 {
638
639 KASSERT(dyn->pfid_kif != NULL, ("%s: null pfid_kif", __func__));
640 KASSERT(dyn->pfid_kt != NULL, ("%s: null pfid_kt", __func__));
641
642 TAILQ_REMOVE(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
643 pfi_kif_unref(dyn->pfid_kif);
644 pfr_detach_table(dyn->pfid_kt);
645 free(dyn, PFI_MTYPE);
646 }
647
648 void
pfi_dynaddr_copyout(struct pf_addr_wrap * aw)649 pfi_dynaddr_copyout(struct pf_addr_wrap *aw)
650 {
651
652 KASSERT(aw->type == PF_ADDR_DYNIFTL,
653 ("%s: type %u", __func__, aw->type));
654
655 if (aw->p.dyn == NULL || aw->p.dyn->pfid_kif == NULL)
656 return;
657 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6;
658 }
659
660 static int
pfi_if_compare(struct pfi_kif * p,struct pfi_kif * q)661 pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q)
662 {
663 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ));
664 }
665
666 void
pfi_update_status(const char * name,struct pf_status * pfs)667 pfi_update_status(const char *name, struct pf_status *pfs)
668 {
669 struct pfi_kif *p;
670 struct pfi_kif_cmp key;
671 struct ifg_member p_member, *ifgm;
672 TAILQ_HEAD(, ifg_member) ifg_members;
673 int i, j, k;
674
675 strlcpy(key.pfik_name, name, sizeof(key.pfik_name));
676 p = RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kif *)&key);
677 if (p == NULL)
678 return;
679
680 if (p->pfik_group != NULL) {
681 bcopy(&p->pfik_group->ifg_members, &ifg_members,
682 sizeof(ifg_members));
683 } else {
684 /* build a temporary list for p only */
685 bzero(&p_member, sizeof(p_member));
686 p_member.ifgm_ifp = p->pfik_ifp;
687 TAILQ_INIT(&ifg_members);
688 TAILQ_INSERT_TAIL(&ifg_members, &p_member, ifgm_next);
689 }
690 if (pfs) {
691 bzero(pfs->pcounters, sizeof(pfs->pcounters));
692 bzero(pfs->bcounters, sizeof(pfs->bcounters));
693 }
694 TAILQ_FOREACH(ifgm, &ifg_members, ifgm_next) {
695 if (ifgm->ifgm_ifp == NULL || ifgm->ifgm_ifp->if_pf_kif == NULL)
696 continue;
697 p = (struct pfi_kif *)ifgm->ifgm_ifp->if_pf_kif;
698
699 /* just clear statistics */
700 if (pfs == NULL) {
701 bzero(p->pfik_packets, sizeof(p->pfik_packets));
702 bzero(p->pfik_bytes, sizeof(p->pfik_bytes));
703 p->pfik_tzero = time_second;
704 continue;
705 }
706 for (i = 0; i < 2; i++)
707 for (j = 0; j < 2; j++)
708 for (k = 0; k < 2; k++) {
709 pfs->pcounters[i][j][k] +=
710 p->pfik_packets[i][j][k];
711 pfs->bcounters[i][j] +=
712 p->pfik_bytes[i][j][k];
713 }
714 }
715 }
716
717 void
pfi_get_ifaces(const char * name,struct pfi_kif * buf,int * size)718 pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size)
719 {
720 struct pfi_kif *p, *nextp;
721 int n = 0;
722
723 for (p = RB_MIN(pfi_ifhead, &V_pfi_ifs); p; p = nextp) {
724 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
725 if (pfi_skip_if(name, p))
726 continue;
727 if (*size <= n++)
728 break;
729 if (!p->pfik_tzero)
730 p->pfik_tzero = time_second;
731 bcopy(p, buf++, sizeof(*buf));
732 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
733 }
734 *size = n;
735 }
736
737 static int
pfi_skip_if(const char * filter,struct pfi_kif * p)738 pfi_skip_if(const char *filter, struct pfi_kif *p)
739 {
740 struct ifg_list *i;
741 int n;
742
743 if (filter == NULL || !*filter)
744 return (0);
745 if (!strcmp(p->pfik_name, filter))
746 return (0); /* exact match */
747 n = strlen(filter);
748 if (n < 1 || n >= IFNAMSIZ)
749 return (1); /* sanity check */
750 if (filter[n-1] >= '0' && filter[n-1] <= '9')
751 return (1); /* group names may not end in a digit */
752 if (p->pfik_ifp != NULL) {
753 IF_ADDR_RLOCK(p->pfik_ifp);
754 TAILQ_FOREACH(i, &p->pfik_ifp->if_groups, ifgl_next) {
755 if (!strncmp(i->ifgl_group->ifg_group, filter,
756 IFNAMSIZ)) {
757 IF_ADDR_RUNLOCK(p->pfik_ifp);
758 return (0); /* iface is in group "filter" */
759 }
760 }
761 IF_ADDR_RUNLOCK(p->pfik_ifp);
762 }
763 return (1);
764 }
765
766 int
pfi_set_flags(const char * name,int flags)767 pfi_set_flags(const char *name, int flags)
768 {
769 struct pfi_kif *p;
770
771 RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) {
772 if (pfi_skip_if(name, p))
773 continue;
774 p->pfik_flags |= flags;
775 }
776 return (0);
777 }
778
779 int
pfi_clear_flags(const char * name,int flags)780 pfi_clear_flags(const char *name, int flags)
781 {
782 struct pfi_kif *p;
783
784 RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) {
785 if (pfi_skip_if(name, p))
786 continue;
787 p->pfik_flags &= ~flags;
788 }
789 return (0);
790 }
791
792 /* from pf_print_state.c */
793 static int
pfi_unmask(void * addr)794 pfi_unmask(void *addr)
795 {
796 struct pf_addr *m = addr;
797 int i = 31, j = 0, b = 0;
798 u_int32_t tmp;
799
800 while (j < 4 && m->addr32[j] == 0xffffffff) {
801 b += 32;
802 j++;
803 }
804 if (j < 4) {
805 tmp = ntohl(m->addr32[j]);
806 for (i = 31; tmp & (1 << i); --i)
807 b++;
808 }
809 return (b);
810 }
811
812 static void
pfi_attach_ifnet_event(void * arg __unused,struct ifnet * ifp)813 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp)
814 {
815
816 CURVNET_SET(ifp->if_vnet);
817 if (V_pf_vnet_active == 0) {
818 /* Avoid teardown race in the least expensive way. */
819 CURVNET_RESTORE();
820 return;
821 }
822 pfi_attach_ifnet(ifp);
823 #ifdef ALTQ
824 PF_RULES_WLOCK();
825 pf_altq_ifnet_event(ifp, 0);
826 PF_RULES_WUNLOCK();
827 #endif
828 CURVNET_RESTORE();
829 }
830
831 static void
pfi_detach_ifnet_event(void * arg __unused,struct ifnet * ifp)832 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
833 {
834 struct pfi_kif *kif = (struct pfi_kif *)ifp->if_pf_kif;
835
836 if (pfsync_detach_ifnet_ptr)
837 pfsync_detach_ifnet_ptr(ifp);
838
839 if (kif == NULL)
840 return;
841
842 CURVNET_SET(ifp->if_vnet);
843 if (V_pf_vnet_active == 0) {
844 /* Avoid teardown race in the least expensive way. */
845 CURVNET_RESTORE();
846 return;
847 }
848
849 PF_RULES_WLOCK();
850 V_pfi_update++;
851 pfi_kif_update(kif);
852
853 if (kif->pfik_ifp)
854 if_rele(kif->pfik_ifp);
855
856 kif->pfik_ifp = NULL;
857 ifp->if_pf_kif = NULL;
858 #ifdef ALTQ
859 pf_altq_ifnet_event(ifp, 1);
860 #endif
861 PF_RULES_WUNLOCK();
862 CURVNET_RESTORE();
863 }
864
865 static void
pfi_attach_group_event(void * arg,struct ifg_group * ifg)866 pfi_attach_group_event(void *arg , struct ifg_group *ifg)
867 {
868
869 CURVNET_SET((struct vnet *)arg);
870 if (V_pf_vnet_active == 0) {
871 /* Avoid teardown race in the least expensive way. */
872 CURVNET_RESTORE();
873 return;
874 }
875 pfi_attach_ifgroup(ifg);
876 CURVNET_RESTORE();
877 }
878
879 static void
pfi_change_group_event(void * arg,char * gname)880 pfi_change_group_event(void *arg, char *gname)
881 {
882 struct pfi_kif *kif;
883
884 CURVNET_SET((struct vnet *)arg);
885 if (V_pf_vnet_active == 0) {
886 /* Avoid teardown race in the least expensive way. */
887 CURVNET_RESTORE();
888 return;
889 }
890
891 kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
892 PF_RULES_WLOCK();
893 V_pfi_update++;
894 kif = pfi_kif_attach(kif, gname);
895 pfi_kif_update(kif);
896 PF_RULES_WUNLOCK();
897 CURVNET_RESTORE();
898 }
899
900 static void
pfi_detach_group_event(void * arg,struct ifg_group * ifg)901 pfi_detach_group_event(void *arg, struct ifg_group *ifg)
902 {
903 struct pfi_kif *kif = (struct pfi_kif *)ifg->ifg_pf_kif;
904
905 if (kif == NULL)
906 return;
907
908 CURVNET_SET((struct vnet *)arg);
909 if (V_pf_vnet_active == 0) {
910 /* Avoid teardown race in the least expensive way. */
911 CURVNET_RESTORE();
912 return;
913 }
914 PF_RULES_WLOCK();
915 V_pfi_update++;
916
917 kif->pfik_group = NULL;
918 ifg->ifg_pf_kif = NULL;
919 PF_RULES_WUNLOCK();
920 CURVNET_RESTORE();
921 }
922
923 static void
pfi_ifaddr_event(void * arg __unused,struct ifnet * ifp)924 pfi_ifaddr_event(void *arg __unused, struct ifnet *ifp)
925 {
926 if (ifp->if_pf_kif == NULL)
927 return;
928
929 CURVNET_SET(ifp->if_vnet);
930 if (V_pf_vnet_active == 0) {
931 /* Avoid teardown race in the least expensive way. */
932 CURVNET_RESTORE();
933 return;
934 }
935 PF_RULES_WLOCK();
936 if (ifp && ifp->if_pf_kif) {
937 V_pfi_update++;
938 pfi_kif_update(ifp->if_pf_kif);
939 }
940 PF_RULES_WUNLOCK();
941 CURVNET_RESTORE();
942 }
943