1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2001 Daniel Hartmeier
5 * Copyright (c) 2003 Cedric Berger
6 * Copyright (c) 2005 Henning Brauer <henning@openbsd.org>
7 * Copyright (c) 2005 Ryan McBride <mcbride@openbsd.org>
8 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * - Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * - Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials provided
20 * with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
30 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
32 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 *
35 * $OpenBSD: pf_if.c,v 1.54 2008/06/14 16:55:28 mk Exp $
36 */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD: stable/12/sys/netpfil/pf/pf_if.c 372816 2022-12-28 09:04:43Z git2svn $");
40
41 #include "opt_inet.h"
42 #include "opt_inet6.h"
43
44 #include <sys/param.h>
45 #include <sys/kernel.h>
46 #include <sys/eventhandler.h>
47 #include <sys/lock.h>
48 #include <sys/mbuf.h>
49 #include <sys/socket.h>
50
51 #include <net/if.h>
52 #include <net/if_var.h>
53 #include <net/vnet.h>
54 #include <net/pfvar.h>
55 #include <net/route.h>
56
57 VNET_DEFINE(struct pfi_kkif *, pfi_all);
58 VNET_DEFINE_STATIC(long, pfi_update);
59 #define V_pfi_update VNET(pfi_update)
60 #define PFI_BUFFER_MAX 0x10000
61
62 VNET_DECLARE(int, pf_vnet_active);
63 #define V_pf_vnet_active VNET(pf_vnet_active)
64
65 VNET_DEFINE_STATIC(struct pfr_addr *, pfi_buffer);
66 VNET_DEFINE_STATIC(int, pfi_buffer_cnt);
67 VNET_DEFINE_STATIC(int, pfi_buffer_max);
68 #define V_pfi_buffer VNET(pfi_buffer)
69 #define V_pfi_buffer_cnt VNET(pfi_buffer_cnt)
70 #define V_pfi_buffer_max VNET(pfi_buffer_max)
71
72 #ifdef PF_WANT_32_TO_64_COUNTER
73 VNET_DEFINE(struct allkiflist_head, pf_allkiflist);
74 VNET_DEFINE(size_t, pf_allkifcount);
75 VNET_DEFINE(struct pfi_kkif *, pf_kifmarker);
76 #endif
77
78 eventhandler_tag pfi_attach_cookie;
79 eventhandler_tag pfi_detach_cookie;
80 eventhandler_tag pfi_attach_group_cookie;
81 eventhandler_tag pfi_change_group_cookie;
82 eventhandler_tag pfi_detach_group_cookie;
83 eventhandler_tag pfi_ifaddr_event_cookie;
84
85 static void pfi_attach_ifnet(struct ifnet *);
86 static void pfi_attach_ifgroup(struct ifg_group *);
87
88 static void pfi_kkif_update(struct pfi_kkif *);
89 static void pfi_dynaddr_update(struct pfi_dynaddr *dyn);
90 static void pfi_table_update(struct pfr_ktable *, struct pfi_kkif *, int,
91 int);
92 static void pfi_instance_add(struct ifnet *, int, int);
93 static void pfi_address_add(struct sockaddr *, int, int);
94 static int pfi_kkif_compare(struct pfi_kkif *, struct pfi_kkif *);
95 static int pfi_skip_if(const char *, struct pfi_kkif *);
96 static int pfi_unmask(void *);
97 static void pfi_attach_ifnet_event(void * __unused, struct ifnet *);
98 static void pfi_detach_ifnet_event(void * __unused, struct ifnet *);
99 static void pfi_attach_group_event(void * __unused, struct ifg_group *);
100 static void pfi_change_group_event(void * __unused, char *);
101 static void pfi_detach_group_event(void * __unused, struct ifg_group *);
102 static void pfi_ifaddr_event(void * __unused, struct ifnet *);
103
104 RB_HEAD(pfi_ifhead, pfi_kkif);
105 static RB_PROTOTYPE(pfi_ifhead, pfi_kkif, pfik_tree, pfi_kkif_compare);
106 static RB_GENERATE(pfi_ifhead, pfi_kkif, pfik_tree, pfi_kkif_compare);
107 VNET_DEFINE_STATIC(struct pfi_ifhead, pfi_ifs);
108 #define V_pfi_ifs VNET(pfi_ifs)
109
110 #define PFI_BUFFER_MAX 0x10000
111 MALLOC_DEFINE(PFI_MTYPE, "pf_ifnet", "pf(4) interface database");
112
113 LIST_HEAD(pfi_list, pfi_kkif);
114 VNET_DEFINE_STATIC(struct pfi_list, pfi_unlinked_kifs);
115 #define V_pfi_unlinked_kifs VNET(pfi_unlinked_kifs)
116 static struct mtx pfi_unlnkdkifs_mtx;
117 MTX_SYSINIT(pfi_unlnkdkifs_mtx, &pfi_unlnkdkifs_mtx, "pf unlinked interfaces",
118 MTX_DEF);
119
120 void
pfi_initialize_vnet(void)121 pfi_initialize_vnet(void)
122 {
123 struct ifg_group *ifg;
124 struct ifnet *ifp;
125 struct pfi_kkif *kif;
126
127 V_pfi_buffer_max = 64;
128 V_pfi_buffer = malloc(V_pfi_buffer_max * sizeof(*V_pfi_buffer),
129 PFI_MTYPE, M_WAITOK);
130
131 kif = pf_kkif_create(M_WAITOK);
132 PF_RULES_WLOCK();
133 V_pfi_all = pfi_kkif_attach(kif, IFG_ALL);
134 PF_RULES_WUNLOCK();
135
136 IFNET_RLOCK();
137 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
138 pfi_attach_ifgroup(ifg);
139 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link)
140 pfi_attach_ifnet(ifp);
141 IFNET_RUNLOCK();
142 }
143
144 void
pfi_initialize(void)145 pfi_initialize(void)
146 {
147
148 pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_arrival_event,
149 pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
150 pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_departure_event,
151 pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
152 pfi_attach_group_cookie = EVENTHANDLER_REGISTER(group_attach_event,
153 pfi_attach_group_event, NULL, EVENTHANDLER_PRI_ANY);
154 pfi_change_group_cookie = EVENTHANDLER_REGISTER(group_change_event,
155 pfi_change_group_event, NULL, EVENTHANDLER_PRI_ANY);
156 pfi_detach_group_cookie = EVENTHANDLER_REGISTER(group_detach_event,
157 pfi_detach_group_event, NULL, EVENTHANDLER_PRI_ANY);
158 pfi_ifaddr_event_cookie = EVENTHANDLER_REGISTER(ifaddr_event,
159 pfi_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY);
160 }
161
162 void
pfi_cleanup_vnet(void)163 pfi_cleanup_vnet(void)
164 {
165 struct pfi_kkif *kif;
166
167 PF_RULES_WASSERT();
168
169 V_pfi_all = NULL;
170 while ((kif = RB_MIN(pfi_ifhead, &V_pfi_ifs))) {
171 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
172 if (kif->pfik_group)
173 kif->pfik_group->ifg_pf_kif = NULL;
174 if (kif->pfik_ifp) {
175 if_rele(kif->pfik_ifp);
176 kif->pfik_ifp->if_pf_kif = NULL;
177 }
178 pf_kkif_free(kif);
179 }
180
181 mtx_lock(&pfi_unlnkdkifs_mtx);
182 while ((kif = LIST_FIRST(&V_pfi_unlinked_kifs))) {
183 LIST_REMOVE(kif, pfik_list);
184 pf_kkif_free(kif);
185 }
186 mtx_unlock(&pfi_unlnkdkifs_mtx);
187
188 free(V_pfi_buffer, PFI_MTYPE);
189 }
190
191 void
pfi_cleanup(void)192 pfi_cleanup(void)
193 {
194
195 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, pfi_attach_cookie);
196 EVENTHANDLER_DEREGISTER(ifnet_departure_event, pfi_detach_cookie);
197 EVENTHANDLER_DEREGISTER(group_attach_event, pfi_attach_group_cookie);
198 EVENTHANDLER_DEREGISTER(group_change_event, pfi_change_group_cookie);
199 EVENTHANDLER_DEREGISTER(group_detach_event, pfi_detach_group_cookie);
200 EVENTHANDLER_DEREGISTER(ifaddr_event, pfi_ifaddr_event_cookie);
201 }
202
203 struct pfi_kkif*
pf_kkif_create(int flags)204 pf_kkif_create(int flags)
205 {
206 struct pfi_kkif *kif;
207 #ifdef PF_WANT_32_TO_64_COUNTER
208 bool wowned;
209 #endif
210
211 kif = malloc(sizeof(*kif), PFI_MTYPE, flags | M_ZERO);
212 if (! kif)
213 return (kif);
214
215 for (int i = 0; i < 2; i++) {
216 for (int j = 0; j < 2; j++) {
217 for (int k = 0; k < 2; k++) {
218 if (pf_counter_u64_init(&kif->pfik_packets[i][j][k], flags) != 0) {
219 pf_kkif_free(kif);
220 return (NULL);
221 }
222
223 if (pf_counter_u64_init(&kif->pfik_bytes[i][j][k], flags) != 0) {
224 pf_kkif_free(kif);
225 return (NULL);
226 }
227 }
228 }
229 }
230
231 #ifdef PF_WANT_32_TO_64_COUNTER
232 wowned = PF_RULES_WOWNED();
233 if (!wowned)
234 PF_RULES_WLOCK();
235 LIST_INSERT_HEAD(&V_pf_allkiflist, kif, pfik_allkiflist);
236 V_pf_allkifcount++;
237 if (!wowned)
238 PF_RULES_WUNLOCK();
239 #endif
240
241 return (kif);
242 }
243
244 void
pf_kkif_free(struct pfi_kkif * kif)245 pf_kkif_free(struct pfi_kkif *kif)
246 {
247 #ifdef PF_WANT_32_TO_64_COUNTER
248 bool wowned;
249 #endif
250
251 if (! kif)
252 return;
253
254 #ifdef PF_WANT_32_TO_64_COUNTER
255 wowned = PF_RULES_WOWNED();
256 if (!wowned)
257 PF_RULES_WLOCK();
258 LIST_REMOVE(kif, pfik_allkiflist);
259 V_pf_allkifcount--;
260 if (!wowned)
261 PF_RULES_WUNLOCK();
262 #endif
263
264 for (int i = 0; i < 2; i++) {
265 for (int j = 0; j < 2; j++) {
266 for (int k = 0; k < 2; k++) {
267 pf_counter_u64_deinit(&kif->pfik_packets[i][j][k]);
268 pf_counter_u64_deinit(&kif->pfik_bytes[i][j][k]);
269 }
270 }
271 }
272
273 free(kif, PFI_MTYPE);
274 }
275
276 void
pf_kkif_zero(struct pfi_kkif * kif)277 pf_kkif_zero(struct pfi_kkif *kif)
278 {
279
280 for (int i = 0; i < 2; i++) {
281 for (int j = 0; j < 2; j++) {
282 for (int k = 0; k < 2; k++) {
283 pf_counter_u64_zero(&kif->pfik_packets[i][j][k]);
284 pf_counter_u64_zero(&kif->pfik_bytes[i][j][k]);
285 }
286 }
287 }
288 kif->pfik_tzero = time_second;
289 }
290
291 struct pfi_kkif *
pfi_kkif_find(const char * kif_name)292 pfi_kkif_find(const char *kif_name)
293 {
294 struct pfi_kif_cmp s;
295
296 PF_RULES_ASSERT();
297
298 memset(&s, 0, sizeof(s));
299 strlcpy(s.pfik_name, kif_name, sizeof(s.pfik_name));
300
301 return (RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kkif *)&s));
302 }
303
304 struct pfi_kkif *
pfi_kkif_attach(struct pfi_kkif * kif,const char * kif_name)305 pfi_kkif_attach(struct pfi_kkif *kif, const char *kif_name)
306 {
307 struct pfi_kkif *kif1;
308
309 PF_RULES_WASSERT();
310 KASSERT(kif != NULL, ("%s: null kif", __func__));
311
312 kif1 = pfi_kkif_find(kif_name);
313 if (kif1 != NULL) {
314 pf_kkif_free(kif);
315 return (kif1);
316 }
317
318 pf_kkif_zero(kif);
319 strlcpy(kif->pfik_name, kif_name, sizeof(kif->pfik_name));
320 /*
321 * It seems that the value of time_second is in unintialzied state
322 * when pf sets interface statistics clear time in boot phase if pf
323 * was statically linked to kernel. Instead of setting the bogus
324 * time value have pfi_get_ifaces handle this case. In
325 * pfi_get_ifaces it uses time_second if it sees the time is 0.
326 */
327 kif->pfik_tzero = time_second > 1 ? time_second : 0;
328 TAILQ_INIT(&kif->pfik_dynaddrs);
329
330 RB_INSERT(pfi_ifhead, &V_pfi_ifs, kif);
331
332 return (kif);
333 }
334
335 void
pfi_kkif_ref(struct pfi_kkif * kif)336 pfi_kkif_ref(struct pfi_kkif *kif)
337 {
338
339 PF_RULES_WASSERT();
340 kif->pfik_rulerefs++;
341 }
342
343 static void
pfi_kkif_remove_if_unref(struct pfi_kkif * kif)344 pfi_kkif_remove_if_unref(struct pfi_kkif *kif)
345 {
346
347 PF_RULES_WASSERT();
348
349 if (kif->pfik_rulerefs > 0)
350 return;
351
352 /* kif referencing an existing ifnet or group or holding flags should
353 * exist. */
354 if (kif->pfik_ifp != NULL || kif->pfik_group != NULL ||
355 kif == V_pfi_all || kif->pfik_flags != 0)
356 return;
357
358 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
359
360 kif->pfik_flags |= PFI_IFLAG_REFS;
361
362 mtx_lock(&pfi_unlnkdkifs_mtx);
363 LIST_INSERT_HEAD(&V_pfi_unlinked_kifs, kif, pfik_list);
364 mtx_unlock(&pfi_unlnkdkifs_mtx);
365 }
366
367 void
pfi_kkif_unref(struct pfi_kkif * kif)368 pfi_kkif_unref(struct pfi_kkif *kif)
369 {
370
371 PF_RULES_WASSERT();
372 KASSERT(kif->pfik_rulerefs > 0, ("%s: %p has zero refs", __func__, kif));
373
374 kif->pfik_rulerefs--;
375
376 pfi_kkif_remove_if_unref(kif);
377 }
378
379 void
pfi_kkif_purge(void)380 pfi_kkif_purge(void)
381 {
382 struct pfi_kkif *kif, *kif1;
383
384 /*
385 * Do naive mark-and-sweep garbage collecting of old kifs.
386 * Reference flag is raised by pf_purge_expired_states().
387 */
388 mtx_lock(&pfi_unlnkdkifs_mtx);
389 LIST_FOREACH_SAFE(kif, &V_pfi_unlinked_kifs, pfik_list, kif1) {
390 if (!(kif->pfik_flags & PFI_IFLAG_REFS)) {
391 LIST_REMOVE(kif, pfik_list);
392 pf_kkif_free(kif);
393 } else
394 kif->pfik_flags &= ~PFI_IFLAG_REFS;
395 }
396 mtx_unlock(&pfi_unlnkdkifs_mtx);
397 }
398
399 int
pfi_kkif_match(struct pfi_kkif * rule_kif,struct pfi_kkif * packet_kif)400 pfi_kkif_match(struct pfi_kkif *rule_kif, struct pfi_kkif *packet_kif)
401 {
402 struct ifg_list *p;
403
404 if (rule_kif == NULL || rule_kif == packet_kif)
405 return (1);
406
407 if (rule_kif->pfik_group != NULL) {
408 IF_ADDR_RLOCK(packet_kif->pfik_ifp);
409 CK_STAILQ_FOREACH(p, &packet_kif->pfik_ifp->if_groups, ifgl_next)
410 if (p->ifgl_group == rule_kif->pfik_group) {
411 IF_ADDR_RUNLOCK(packet_kif->pfik_ifp);
412 return (1);
413 }
414 IF_ADDR_RUNLOCK(packet_kif->pfik_ifp);
415 }
416
417
418 return (0);
419 }
420
421 static void
pfi_attach_ifnet(struct ifnet * ifp)422 pfi_attach_ifnet(struct ifnet *ifp)
423 {
424 struct pfi_kkif *kif;
425
426 kif = pf_kkif_create(M_WAITOK);
427
428 PF_RULES_WLOCK();
429 V_pfi_update++;
430 kif = pfi_kkif_attach(kif, ifp->if_xname);
431
432 if_ref(ifp);
433
434 kif->pfik_ifp = ifp;
435 ifp->if_pf_kif = kif;
436
437 pfi_kkif_update(kif);
438 PF_RULES_WUNLOCK();
439 }
440
441 static void
pfi_attach_ifgroup(struct ifg_group * ifg)442 pfi_attach_ifgroup(struct ifg_group *ifg)
443 {
444 struct pfi_kkif *kif;
445
446 kif = pf_kkif_create(M_WAITOK);
447
448 PF_RULES_WLOCK();
449 V_pfi_update++;
450 kif = pfi_kkif_attach(kif, ifg->ifg_group);
451
452 kif->pfik_group = ifg;
453 ifg->ifg_pf_kif = kif;
454 PF_RULES_WUNLOCK();
455 }
456
457 int
pfi_match_addr(struct pfi_dynaddr * dyn,struct pf_addr * a,sa_family_t af)458 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af)
459 {
460 switch (af) {
461 #ifdef INET
462 case AF_INET:
463 switch (dyn->pfid_acnt4) {
464 case 0:
465 return (0);
466 case 1:
467 return (PF_MATCHA(0, &dyn->pfid_addr4,
468 &dyn->pfid_mask4, a, AF_INET));
469 default:
470 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET));
471 }
472 break;
473 #endif /* INET */
474 #ifdef INET6
475 case AF_INET6:
476 switch (dyn->pfid_acnt6) {
477 case 0:
478 return (0);
479 case 1:
480 return (PF_MATCHA(0, &dyn->pfid_addr6,
481 &dyn->pfid_mask6, a, AF_INET6));
482 default:
483 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6));
484 }
485 break;
486 #endif /* INET6 */
487 default:
488 return (0);
489 }
490 }
491
492 int
pfi_dynaddr_setup(struct pf_addr_wrap * aw,sa_family_t af)493 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
494 {
495 struct pfi_dynaddr *dyn;
496 char tblname[PF_TABLE_NAME_SIZE];
497 struct pf_kruleset *ruleset = NULL;
498 struct pfi_kkif *kif;
499 int rv = 0;
500
501 PF_RULES_WASSERT();
502 KASSERT(aw->type == PF_ADDR_DYNIFTL, ("%s: type %u",
503 __func__, aw->type));
504 KASSERT(aw->p.dyn == NULL, ("%s: dyn is %p", __func__, aw->p.dyn));
505
506 if ((dyn = malloc(sizeof(*dyn), PFI_MTYPE, M_NOWAIT | M_ZERO)) == NULL)
507 return (ENOMEM);
508
509 if ((kif = pf_kkif_create(M_NOWAIT)) == NULL) {
510 free(dyn, PFI_MTYPE);
511 return (ENOMEM);
512 }
513
514 if (!strcmp(aw->v.ifname, "self"))
515 dyn->pfid_kif = pfi_kkif_attach(kif, IFG_ALL);
516 else
517 dyn->pfid_kif = pfi_kkif_attach(kif, aw->v.ifname);
518 kif = NULL;
519 pfi_kkif_ref(dyn->pfid_kif);
520
521 dyn->pfid_net = pfi_unmask(&aw->v.a.mask);
522 if (af == AF_INET && dyn->pfid_net == 32)
523 dyn->pfid_net = 128;
524 strlcpy(tblname, aw->v.ifname, sizeof(tblname));
525 if (aw->iflags & PFI_AFLAG_NETWORK)
526 strlcat(tblname, ":network", sizeof(tblname));
527 if (aw->iflags & PFI_AFLAG_BROADCAST)
528 strlcat(tblname, ":broadcast", sizeof(tblname));
529 if (aw->iflags & PFI_AFLAG_PEER)
530 strlcat(tblname, ":peer", sizeof(tblname));
531 if (aw->iflags & PFI_AFLAG_NOALIAS)
532 strlcat(tblname, ":0", sizeof(tblname));
533 if (dyn->pfid_net != 128)
534 snprintf(tblname + strlen(tblname),
535 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net);
536 if ((ruleset = pf_find_or_create_kruleset(PF_RESERVED_ANCHOR)) == NULL) {
537 rv = ENOMEM;
538 goto _bad;
539 }
540
541 if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) {
542 rv = ENOMEM;
543 goto _bad;
544 }
545
546 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE;
547 dyn->pfid_iflags = aw->iflags;
548 dyn->pfid_af = af;
549
550 TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
551 aw->p.dyn = dyn;
552 pfi_kkif_update(dyn->pfid_kif);
553
554 return (0);
555
556 _bad:
557 if (dyn->pfid_kt != NULL)
558 pfr_detach_table(dyn->pfid_kt);
559 if (ruleset != NULL)
560 pf_remove_if_empty_kruleset(ruleset);
561 pfi_kkif_unref(dyn->pfid_kif);
562 free(dyn, PFI_MTYPE);
563
564 return (rv);
565 }
566
567 static void
pfi_kkif_update(struct pfi_kkif * kif)568 pfi_kkif_update(struct pfi_kkif *kif)
569 {
570 struct ifg_list *ifgl;
571 struct ifg_member *ifgm;
572 struct pfi_dynaddr *p;
573 struct pfi_kkif *tmpkif;
574
575 PF_RULES_WASSERT();
576
577 /* update all dynaddr */
578 TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry)
579 pfi_dynaddr_update(p);
580
581 /* Apply group flags to new members. */
582 if (kif->pfik_group != NULL) {
583 CK_STAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members,
584 ifgm_next) {
585 tmpkif = (struct pfi_kkif *)ifgm->ifgm_ifp->if_pf_kif;
586 if (tmpkif == NULL)
587 continue;
588
589 tmpkif->pfik_flags |= kif->pfik_flags;
590 }
591 }
592
593 /* again for all groups kif is member of */
594 if (kif->pfik_ifp != NULL) {
595 IF_ADDR_RLOCK(kif->pfik_ifp);
596 CK_STAILQ_FOREACH(ifgl, &kif->pfik_ifp->if_groups, ifgl_next)
597 pfi_kkif_update((struct pfi_kkif *)
598 ifgl->ifgl_group->ifg_pf_kif);
599 IF_ADDR_RUNLOCK(kif->pfik_ifp);
600 }
601 }
602
603 static void
pfi_dynaddr_update(struct pfi_dynaddr * dyn)604 pfi_dynaddr_update(struct pfi_dynaddr *dyn)
605 {
606 struct pfi_kkif *kif;
607 struct pfr_ktable *kt;
608
609 PF_RULES_WASSERT();
610 KASSERT(dyn && dyn->pfid_kif && dyn->pfid_kt,
611 ("%s: bad argument", __func__));
612
613 kif = dyn->pfid_kif;
614 kt = dyn->pfid_kt;
615
616 if (kt->pfrkt_larg != V_pfi_update) {
617 /* this table needs to be brought up-to-date */
618 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags);
619 kt->pfrkt_larg = V_pfi_update;
620 }
621 pfr_dynaddr_update(kt, dyn);
622 }
623
624 static void
pfi_table_update(struct pfr_ktable * kt,struct pfi_kkif * kif,int net,int flags)625 pfi_table_update(struct pfr_ktable *kt, struct pfi_kkif *kif, int net, int flags)
626 {
627 int e, size2 = 0;
628 struct ifg_member *ifgm;
629
630 V_pfi_buffer_cnt = 0;
631
632 if (kif->pfik_ifp != NULL)
633 pfi_instance_add(kif->pfik_ifp, net, flags);
634 else if (kif->pfik_group != NULL) {
635 IFNET_RLOCK_NOSLEEP();
636 CK_STAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, ifgm_next)
637 pfi_instance_add(ifgm->ifgm_ifp, net, flags);
638 IFNET_RUNLOCK_NOSLEEP();
639 }
640
641 if ((e = pfr_set_addrs(&kt->pfrkt_t, V_pfi_buffer, V_pfi_buffer_cnt, &size2,
642 NULL, NULL, NULL, 0, PFR_TFLAG_ALLMASK)))
643 printf("%s: cannot set %d new addresses into table %s: %d\n",
644 __func__, V_pfi_buffer_cnt, kt->pfrkt_name, e);
645 }
646
647 static void
pfi_instance_add(struct ifnet * ifp,int net,int flags)648 pfi_instance_add(struct ifnet *ifp, int net, int flags)
649 {
650 struct ifaddr *ia;
651 int got4 = 0, got6 = 0;
652 int net2, af;
653
654 IF_ADDR_RLOCK(ifp);
655 CK_STAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) {
656 if (ia->ifa_addr == NULL)
657 continue;
658 af = ia->ifa_addr->sa_family;
659 if (af != AF_INET && af != AF_INET6)
660 continue;
661 /*
662 * XXX: For point-to-point interfaces, (ifname:0) and IPv4,
663 * jump over addresses without a proper route to work
664 * around a problem with ppp not fully removing the
665 * address used during IPCP.
666 */
667 if ((ifp->if_flags & IFF_POINTOPOINT) &&
668 !(ia->ifa_flags & IFA_ROUTE) &&
669 (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET))
670 continue;
671 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6)
672 continue;
673 if ((flags & PFI_AFLAG_BROADCAST) &&
674 !(ifp->if_flags & IFF_BROADCAST))
675 continue;
676 if ((flags & PFI_AFLAG_PEER) &&
677 !(ifp->if_flags & IFF_POINTOPOINT))
678 continue;
679 if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 &&
680 IN6_IS_ADDR_LINKLOCAL(
681 &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr))
682 continue;
683 if (flags & PFI_AFLAG_NOALIAS) {
684 if (af == AF_INET && got4)
685 continue;
686 if (af == AF_INET6 && got6)
687 continue;
688 }
689 if (af == AF_INET)
690 got4 = 1;
691 else if (af == AF_INET6)
692 got6 = 1;
693 net2 = net;
694 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) {
695 if (af == AF_INET)
696 net2 = pfi_unmask(&((struct sockaddr_in *)
697 ia->ifa_netmask)->sin_addr);
698 else if (af == AF_INET6)
699 net2 = pfi_unmask(&((struct sockaddr_in6 *)
700 ia->ifa_netmask)->sin6_addr);
701 }
702 if (af == AF_INET && net2 > 32)
703 net2 = 32;
704 if (flags & PFI_AFLAG_BROADCAST)
705 pfi_address_add(ia->ifa_broadaddr, af, net2);
706 else if (flags & PFI_AFLAG_PEER)
707 pfi_address_add(ia->ifa_dstaddr, af, net2);
708 else
709 pfi_address_add(ia->ifa_addr, af, net2);
710 }
711 IF_ADDR_RUNLOCK(ifp);
712 }
713
714 static void
pfi_address_add(struct sockaddr * sa,int af,int net)715 pfi_address_add(struct sockaddr *sa, int af, int net)
716 {
717 struct pfr_addr *p;
718 int i;
719
720 if (V_pfi_buffer_cnt >= V_pfi_buffer_max) {
721 int new_max = V_pfi_buffer_max * 2;
722
723 if (new_max > PFI_BUFFER_MAX) {
724 printf("%s: address buffer full (%d/%d)\n", __func__,
725 V_pfi_buffer_cnt, PFI_BUFFER_MAX);
726 return;
727 }
728 p = malloc(new_max * sizeof(*V_pfi_buffer), PFI_MTYPE,
729 M_NOWAIT);
730 if (p == NULL) {
731 printf("%s: no memory to grow buffer (%d/%d)\n",
732 __func__, V_pfi_buffer_cnt, PFI_BUFFER_MAX);
733 return;
734 }
735 memcpy(p, V_pfi_buffer, V_pfi_buffer_max * sizeof(*V_pfi_buffer));
736 /* no need to zero buffer */
737 free(V_pfi_buffer, PFI_MTYPE);
738 V_pfi_buffer = p;
739 V_pfi_buffer_max = new_max;
740 }
741 if (af == AF_INET && net > 32)
742 net = 128;
743 p = V_pfi_buffer + V_pfi_buffer_cnt++;
744 memset(p, 0, sizeof(*p));
745 p->pfra_af = af;
746 p->pfra_net = net;
747 if (af == AF_INET)
748 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr;
749 else if (af == AF_INET6) {
750 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr;
751 if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr))
752 p->pfra_ip6addr.s6_addr16[1] = 0;
753 }
754 /* mask network address bits */
755 if (net < 128)
756 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8));
757 for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++)
758 ((caddr_t)p)[i] = 0;
759 }
760
761 void
pfi_dynaddr_remove(struct pfi_dynaddr * dyn)762 pfi_dynaddr_remove(struct pfi_dynaddr *dyn)
763 {
764
765 KASSERT(dyn->pfid_kif != NULL, ("%s: null pfid_kif", __func__));
766 KASSERT(dyn->pfid_kt != NULL, ("%s: null pfid_kt", __func__));
767
768 TAILQ_REMOVE(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
769 pfi_kkif_unref(dyn->pfid_kif);
770 pfr_detach_table(dyn->pfid_kt);
771 free(dyn, PFI_MTYPE);
772 }
773
774 void
pfi_dynaddr_copyout(struct pf_addr_wrap * aw)775 pfi_dynaddr_copyout(struct pf_addr_wrap *aw)
776 {
777
778 KASSERT(aw->type == PF_ADDR_DYNIFTL,
779 ("%s: type %u", __func__, aw->type));
780
781 if (aw->p.dyn == NULL || aw->p.dyn->pfid_kif == NULL)
782 return;
783 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6;
784 }
785
786 static int
pfi_kkif_compare(struct pfi_kkif * p,struct pfi_kkif * q)787 pfi_kkif_compare(struct pfi_kkif *p, struct pfi_kkif *q)
788 {
789 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ));
790 }
791
792 void
pfi_update_status(const char * name,struct pf_status * pfs)793 pfi_update_status(const char *name, struct pf_status *pfs)
794 {
795 struct pfi_kkif *p;
796 struct pfi_kif_cmp key;
797 struct ifg_member p_member, *ifgm;
798 CK_STAILQ_HEAD(, ifg_member) ifg_members;
799 int i, j, k;
800
801 if (pfs) {
802 memset(pfs->pcounters, 0, sizeof(pfs->pcounters));
803 memset(pfs->bcounters, 0, sizeof(pfs->bcounters));
804 }
805
806 strlcpy(key.pfik_name, name, sizeof(key.pfik_name));
807 p = RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kkif *)&key);
808 if (p == NULL) {
809 return;
810 }
811
812 if (p->pfik_group != NULL) {
813 memcpy(&ifg_members, &p->pfik_group->ifg_members,
814 sizeof(ifg_members));
815 } else {
816 /* build a temporary list for p only */
817 memset(&p_member, 0, sizeof(p_member));
818 p_member.ifgm_ifp = p->pfik_ifp;
819 CK_STAILQ_INIT(&ifg_members);
820 CK_STAILQ_INSERT_TAIL(&ifg_members, &p_member, ifgm_next);
821 }
822 CK_STAILQ_FOREACH(ifgm, &ifg_members, ifgm_next) {
823 if (ifgm->ifgm_ifp == NULL || ifgm->ifgm_ifp->if_pf_kif == NULL)
824 continue;
825 p = (struct pfi_kkif *)ifgm->ifgm_ifp->if_pf_kif;
826
827 /* just clear statistics */
828 if (pfs == NULL) {
829 pf_kkif_zero(p);
830 continue;
831 }
832 for (i = 0; i < 2; i++)
833 for (j = 0; j < 2; j++)
834 for (k = 0; k < 2; k++) {
835 pfs->pcounters[i][j][k] +=
836 pf_counter_u64_fetch(&p->pfik_packets[i][j][k]);
837 pfs->bcounters[i][j] +=
838 pf_counter_u64_fetch(&p->pfik_bytes[i][j][k]);
839 }
840 }
841 }
842
843 static void
pf_kkif_to_kif(struct pfi_kkif * kkif,struct pfi_kif * kif)844 pf_kkif_to_kif(struct pfi_kkif *kkif, struct pfi_kif *kif)
845 {
846
847 memset(kif, 0, sizeof(*kif));
848 strlcpy(kif->pfik_name, kkif->pfik_name, sizeof(kif->pfik_name));
849 for (int i = 0; i < 2; i++) {
850 for (int j = 0; j < 2; j++) {
851 for (int k = 0; k < 2; k++) {
852 kif->pfik_packets[i][j][k] =
853 pf_counter_u64_fetch(&kkif->pfik_packets[i][j][k]);
854 kif->pfik_bytes[i][j][k] =
855 pf_counter_u64_fetch(&kkif->pfik_bytes[i][j][k]);
856 }
857 }
858 }
859 kif->pfik_flags = kkif->pfik_flags;
860 kif->pfik_tzero = kkif->pfik_tzero;
861 kif->pfik_rulerefs = kkif->pfik_rulerefs;
862 /*
863 * Userspace relies on this pointer to decide if this is a group or
864 * not. We don't want to share the actual pointer, because it's
865 * useless to userspace and leaks kernel memory layout information.
866 * So instead we provide 0xfeedcode as 'true' and NULL as 'false'.
867 */
868 kif->pfik_group =
869 kkif->pfik_group ? (struct ifg_group *)0xfeedc0de : NULL;
870 }
871
872 void
pfi_get_ifaces(const char * name,struct pfi_kif * buf,int * size)873 pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size)
874 {
875 struct pfi_kkif *p, *nextp;
876 int n = 0;
877
878 for (p = RB_MIN(pfi_ifhead, &V_pfi_ifs); p; p = nextp) {
879 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
880 if (pfi_skip_if(name, p))
881 continue;
882 if (*size <= n++)
883 break;
884 if (!p->pfik_tzero)
885 p->pfik_tzero = time_second;
886 pf_kkif_to_kif(p, buf++);
887 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
888 }
889 *size = n;
890 }
891
892 static int
pfi_skip_if(const char * filter,struct pfi_kkif * p)893 pfi_skip_if(const char *filter, struct pfi_kkif *p)
894 {
895 struct ifg_list *i;
896 int n;
897
898 if (filter == NULL || !*filter)
899 return (0);
900 if (!strcmp(p->pfik_name, filter))
901 return (0); /* exact match */
902 n = strlen(filter);
903 if (n < 1 || n >= IFNAMSIZ)
904 return (1); /* sanity check */
905 if (filter[n-1] >= '0' && filter[n-1] <= '9')
906 return (1); /* group names may not end in a digit */
907 if (p->pfik_ifp != NULL) {
908 IF_ADDR_RLOCK(p->pfik_ifp);
909 CK_STAILQ_FOREACH(i, &p->pfik_ifp->if_groups, ifgl_next) {
910 if (!strncmp(i->ifgl_group->ifg_group, filter,
911 IFNAMSIZ)) {
912 IF_ADDR_RUNLOCK(p->pfik_ifp);
913 return (0); /* iface is in group "filter" */
914 }
915 }
916 IF_ADDR_RUNLOCK(p->pfik_ifp);
917 }
918 return (1);
919 }
920
921 int
pfi_set_flags(const char * name,int flags)922 pfi_set_flags(const char *name, int flags)
923 {
924 struct pfi_kkif *p, *kif;
925
926 kif = pf_kkif_create(M_NOWAIT);
927 if (kif == NULL)
928 return (ENOMEM);
929
930 kif = pfi_kkif_attach(kif, name);
931
932 RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) {
933 if (pfi_skip_if(name, p))
934 continue;
935 p->pfik_flags |= flags;
936 }
937 return (0);
938 }
939
940 int
pfi_clear_flags(const char * name,int flags)941 pfi_clear_flags(const char *name, int flags)
942 {
943 struct pfi_kkif *p, *tmp;
944
945 RB_FOREACH_SAFE(p, pfi_ifhead, &V_pfi_ifs, tmp) {
946 if (pfi_skip_if(name, p))
947 continue;
948 p->pfik_flags &= ~flags;
949
950 if (p->pfik_ifp == NULL && p->pfik_group == NULL &&
951 p->pfik_flags == 0 && p->pfik_rulerefs == 0) {
952 /* Delete this kif. */
953 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, p);
954 pf_kkif_free(p);
955 }
956 }
957 return (0);
958 }
959
960 /* from pf_print_state.c */
961 static int
pfi_unmask(void * addr)962 pfi_unmask(void *addr)
963 {
964 struct pf_addr *m = addr;
965 int i = 31, j = 0, b = 0;
966 u_int32_t tmp;
967
968 while (j < 4 && m->addr32[j] == 0xffffffff) {
969 b += 32;
970 j++;
971 }
972 if (j < 4) {
973 tmp = ntohl(m->addr32[j]);
974 for (i = 31; tmp & (1 << i); --i)
975 b++;
976 }
977 return (b);
978 }
979
980 static void
pfi_attach_ifnet_event(void * arg __unused,struct ifnet * ifp)981 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp)
982 {
983
984 if (V_pf_vnet_active == 0) {
985 /* Avoid teardown race in the least expensive way. */
986 return;
987 }
988 pfi_attach_ifnet(ifp);
989 #ifdef ALTQ
990 PF_RULES_WLOCK();
991 pf_altq_ifnet_event(ifp, 0);
992 PF_RULES_WUNLOCK();
993 #endif
994 }
995
996 static void
pfi_detach_ifnet_event(void * arg __unused,struct ifnet * ifp)997 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
998 {
999 struct pfi_kkif *kif = (struct pfi_kkif *)ifp->if_pf_kif;
1000
1001 if (pfsync_detach_ifnet_ptr)
1002 pfsync_detach_ifnet_ptr(ifp);
1003
1004 if (kif == NULL)
1005 return;
1006
1007 if (V_pf_vnet_active == 0) {
1008 /* Avoid teardown race in the least expensive way. */
1009 return;
1010 }
1011
1012 PF_RULES_WLOCK();
1013 V_pfi_update++;
1014 pfi_kkif_update(kif);
1015
1016 if (kif->pfik_ifp)
1017 if_rele(kif->pfik_ifp);
1018
1019 kif->pfik_ifp = NULL;
1020 ifp->if_pf_kif = NULL;
1021 #ifdef ALTQ
1022 pf_altq_ifnet_event(ifp, 1);
1023 #endif
1024 pfi_kkif_remove_if_unref(kif);
1025
1026 PF_RULES_WUNLOCK();
1027 }
1028
1029 static void
pfi_attach_group_event(void * arg __unused,struct ifg_group * ifg)1030 pfi_attach_group_event(void *arg __unused, struct ifg_group *ifg)
1031 {
1032
1033 if (V_pf_vnet_active == 0) {
1034 /* Avoid teardown race in the least expensive way. */
1035 return;
1036 }
1037 pfi_attach_ifgroup(ifg);
1038 }
1039
1040 static void
pfi_change_group_event(void * arg __unused,char * gname)1041 pfi_change_group_event(void *arg __unused, char *gname)
1042 {
1043 struct pfi_kkif *kif;
1044
1045 if (V_pf_vnet_active == 0) {
1046 /* Avoid teardown race in the least expensive way. */
1047 return;
1048 }
1049
1050 kif = pf_kkif_create(M_WAITOK);
1051 PF_RULES_WLOCK();
1052 V_pfi_update++;
1053 kif = pfi_kkif_attach(kif, gname);
1054 pfi_kkif_update(kif);
1055 PF_RULES_WUNLOCK();
1056 }
1057
1058 static void
pfi_detach_group_event(void * arg __unused,struct ifg_group * ifg)1059 pfi_detach_group_event(void *arg __unused, struct ifg_group *ifg)
1060 {
1061 struct pfi_kkif *kif = (struct pfi_kkif *)ifg->ifg_pf_kif;
1062
1063 if (kif == NULL)
1064 return;
1065
1066 if (V_pf_vnet_active == 0) {
1067 /* Avoid teardown race in the least expensive way. */
1068 return;
1069 }
1070 PF_RULES_WLOCK();
1071 V_pfi_update++;
1072
1073 kif->pfik_group = NULL;
1074 ifg->ifg_pf_kif = NULL;
1075
1076 pfi_kkif_remove_if_unref(kif);
1077 PF_RULES_WUNLOCK();
1078 }
1079
1080 static void
pfi_ifaddr_event(void * arg __unused,struct ifnet * ifp)1081 pfi_ifaddr_event(void *arg __unused, struct ifnet *ifp)
1082 {
1083 if (ifp->if_pf_kif == NULL)
1084 return;
1085
1086 if (V_pf_vnet_active == 0) {
1087 /* Avoid teardown race in the least expensive way. */
1088 return;
1089 }
1090 PF_RULES_WLOCK();
1091 if (ifp && ifp->if_pf_kif) {
1092 V_pfi_update++;
1093 pfi_kkif_update(ifp->if_pf_kif);
1094 }
1095 PF_RULES_WUNLOCK();
1096 }
1097