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