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 #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/if_private.h> 52 #include <net/vnet.h> 53 #include <net/pfvar.h> 54 #include <net/route.h> 55 56 VNET_DEFINE(struct pfi_kkif *, pfi_all); 57 VNET_DEFINE_STATIC(long, pfi_update); 58 #define V_pfi_update VNET(pfi_update) 59 #define PFI_BUFFER_MAX 0x10000 60 61 VNET_DECLARE(int, pf_vnet_active); 62 #define V_pf_vnet_active VNET(pf_vnet_active) 63 64 VNET_DEFINE_STATIC(struct pfr_addr *, pfi_buffer); 65 VNET_DEFINE_STATIC(int, pfi_buffer_cnt); 66 VNET_DEFINE_STATIC(int, pfi_buffer_max); 67 #define V_pfi_buffer VNET(pfi_buffer) 68 #define V_pfi_buffer_cnt VNET(pfi_buffer_cnt) 69 #define V_pfi_buffer_max VNET(pfi_buffer_max) 70 71 #ifdef PF_WANT_32_TO_64_COUNTER 72 VNET_DEFINE(struct allkiflist_head, pf_allkiflist); 73 VNET_DEFINE(size_t, pf_allkifcount); 74 VNET_DEFINE(struct pfi_kkif *, pf_kifmarker); 75 #endif 76 77 eventhandler_tag pfi_attach_cookie; 78 eventhandler_tag pfi_detach_cookie; 79 eventhandler_tag pfi_attach_group_cookie; 80 eventhandler_tag pfi_change_group_cookie; 81 eventhandler_tag pfi_detach_group_cookie; 82 eventhandler_tag pfi_ifaddr_event_cookie; 83 84 static void pfi_attach_ifnet(struct ifnet *, struct pfi_kkif *); 85 static void pfi_attach_ifgroup(struct ifg_group *, struct pfi_kkif *); 86 87 static void pfi_kkif_update(struct pfi_kkif *); 88 static void pfi_dynaddr_update(struct pfi_dynaddr *dyn); 89 static void pfi_table_update(struct pfr_ktable *, struct pfi_kkif *, int, 90 int); 91 static void pfi_instance_add(struct ifnet *, int, int); 92 static void pfi_address_add(struct sockaddr *, int, int); 93 static int pfi_kkif_compare(struct pfi_kkif *, struct pfi_kkif *); 94 static int pfi_skip_if(const char *, struct pfi_kkif *); 95 static int pfi_unmask(void *); 96 static void pfi_attach_ifnet_event(void * __unused, struct ifnet *); 97 static void pfi_detach_ifnet_event(void * __unused, struct ifnet *); 98 static void pfi_attach_group_event(void * __unused, struct ifg_group *); 99 static void pfi_change_group_event(void * __unused, char *); 100 static void pfi_detach_group_event(void * __unused, struct ifg_group *); 101 static void pfi_ifaddr_event(void * __unused, struct ifnet *); 102 103 RB_HEAD(pfi_ifhead, pfi_kkif); 104 static RB_PROTOTYPE(pfi_ifhead, pfi_kkif, pfik_tree, pfi_kkif_compare); 105 static RB_GENERATE(pfi_ifhead, pfi_kkif, pfik_tree, pfi_kkif_compare); 106 VNET_DEFINE_STATIC(struct pfi_ifhead, pfi_ifs); 107 #define V_pfi_ifs VNET(pfi_ifs) 108 109 #define PFI_BUFFER_MAX 0x10000 110 MALLOC_DEFINE(PFI_MTYPE, "pf_ifnet", "pf(4) interface database"); 111 112 LIST_HEAD(pfi_list, pfi_kkif); 113 VNET_DEFINE_STATIC(struct pfi_list, pfi_unlinked_kifs); 114 #define V_pfi_unlinked_kifs VNET(pfi_unlinked_kifs) 115 static struct mtx pfi_unlnkdkifs_mtx; 116 MTX_SYSINIT(pfi_unlnkdkifs_mtx, &pfi_unlnkdkifs_mtx, "pf unlinked interfaces", 117 MTX_DEF); 118 119 void 120 pfi_initialize_vnet(void) 121 { 122 struct pfi_list kifs = LIST_HEAD_INITIALIZER(); 123 struct epoch_tracker et; 124 struct pfi_kkif *kif; 125 struct ifg_group *ifg; 126 struct ifnet *ifp; 127 int nkifs; 128 129 V_pfi_buffer_max = 64; 130 V_pfi_buffer = malloc(V_pfi_buffer_max * sizeof(*V_pfi_buffer), 131 PFI_MTYPE, M_WAITOK); 132 133 nkifs = 1; /* one for V_pfi_all */ 134 IFNET_RLOCK(); 135 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) 136 nkifs++; 137 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) 138 nkifs++; 139 140 for (int n = 0; n < nkifs; n++) { 141 kif = pf_kkif_create(M_WAITOK); 142 LIST_INSERT_HEAD(&kifs, kif, pfik_list); 143 } 144 145 NET_EPOCH_ENTER(et); 146 PF_RULES_WLOCK(); 147 kif = LIST_FIRST(&kifs); 148 LIST_REMOVE(kif, pfik_list); 149 V_pfi_all = pfi_kkif_attach(kif, IFG_ALL); 150 CK_STAILQ_FOREACH(ifg, &V_ifg_head, ifg_next) { 151 kif = LIST_FIRST(&kifs); 152 LIST_REMOVE(kif, pfik_list); 153 pfi_attach_ifgroup(ifg, kif); 154 } 155 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 156 kif = LIST_FIRST(&kifs); 157 LIST_REMOVE(kif, pfik_list); 158 pfi_attach_ifnet(ifp, kif); 159 } 160 PF_RULES_WUNLOCK(); 161 NET_EPOCH_EXIT(et); 162 IFNET_RUNLOCK(); 163 164 MPASS(LIST_EMPTY(&kifs)); 165 } 166 167 void 168 pfi_initialize(void) 169 { 170 171 pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_arrival_event, 172 pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 173 pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_departure_event, 174 pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY); 175 pfi_attach_group_cookie = EVENTHANDLER_REGISTER(group_attach_event, 176 pfi_attach_group_event, NULL, EVENTHANDLER_PRI_ANY); 177 pfi_change_group_cookie = EVENTHANDLER_REGISTER(group_change_event, 178 pfi_change_group_event, NULL, EVENTHANDLER_PRI_ANY); 179 pfi_detach_group_cookie = EVENTHANDLER_REGISTER(group_detach_event, 180 pfi_detach_group_event, NULL, EVENTHANDLER_PRI_ANY); 181 pfi_ifaddr_event_cookie = EVENTHANDLER_REGISTER(ifaddr_event, 182 pfi_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY); 183 } 184 185 void 186 pfi_cleanup_vnet(void) 187 { 188 struct pfi_kkif *kif; 189 190 PF_RULES_WASSERT(); 191 192 V_pfi_all = NULL; 193 while ((kif = RB_MIN(pfi_ifhead, &V_pfi_ifs))) { 194 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif); 195 if (kif->pfik_group) 196 kif->pfik_group->ifg_pf_kif = NULL; 197 if (kif->pfik_ifp) { 198 if_rele(kif->pfik_ifp); 199 kif->pfik_ifp->if_pf_kif = NULL; 200 } 201 pf_kkif_free(kif); 202 } 203 204 mtx_lock(&pfi_unlnkdkifs_mtx); 205 while ((kif = LIST_FIRST(&V_pfi_unlinked_kifs))) { 206 LIST_REMOVE(kif, pfik_list); 207 pf_kkif_free(kif); 208 } 209 mtx_unlock(&pfi_unlnkdkifs_mtx); 210 211 free(V_pfi_buffer, PFI_MTYPE); 212 } 213 214 void 215 pfi_cleanup(void) 216 { 217 218 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, pfi_attach_cookie); 219 EVENTHANDLER_DEREGISTER(ifnet_departure_event, pfi_detach_cookie); 220 EVENTHANDLER_DEREGISTER(group_attach_event, pfi_attach_group_cookie); 221 EVENTHANDLER_DEREGISTER(group_change_event, pfi_change_group_cookie); 222 EVENTHANDLER_DEREGISTER(group_detach_event, pfi_detach_group_cookie); 223 EVENTHANDLER_DEREGISTER(ifaddr_event, pfi_ifaddr_event_cookie); 224 } 225 226 struct pfi_kkif* 227 pf_kkif_create(int flags) 228 { 229 struct pfi_kkif *kif; 230 #ifdef PF_WANT_32_TO_64_COUNTER 231 bool wowned; 232 #endif 233 234 kif = malloc(sizeof(*kif), PFI_MTYPE, flags | M_ZERO); 235 if (! kif) 236 return (kif); 237 238 for (int i = 0; i < 2; i++) { 239 for (int j = 0; j < 2; j++) { 240 for (int k = 0; k < 2; k++) { 241 if (pf_counter_u64_init(&kif->pfik_packets[i][j][k], flags) != 0) { 242 pf_kkif_free(kif); 243 return (NULL); 244 } 245 246 if (pf_counter_u64_init(&kif->pfik_bytes[i][j][k], flags) != 0) { 247 pf_kkif_free(kif); 248 return (NULL); 249 } 250 } 251 } 252 } 253 254 #ifdef PF_WANT_32_TO_64_COUNTER 255 wowned = PF_RULES_WOWNED(); 256 if (!wowned) 257 PF_RULES_WLOCK(); 258 LIST_INSERT_HEAD(&V_pf_allkiflist, kif, pfik_allkiflist); 259 V_pf_allkifcount++; 260 if (!wowned) 261 PF_RULES_WUNLOCK(); 262 #endif 263 264 return (kif); 265 } 266 267 void 268 pf_kkif_free(struct pfi_kkif *kif) 269 { 270 #ifdef PF_WANT_32_TO_64_COUNTER 271 bool wowned; 272 #endif 273 274 if (! kif) 275 return; 276 277 #ifdef PF_WANT_32_TO_64_COUNTER 278 wowned = PF_RULES_WOWNED(); 279 if (!wowned) 280 PF_RULES_WLOCK(); 281 LIST_REMOVE(kif, pfik_allkiflist); 282 V_pf_allkifcount--; 283 if (!wowned) 284 PF_RULES_WUNLOCK(); 285 #endif 286 287 for (int i = 0; i < 2; i++) { 288 for (int j = 0; j < 2; j++) { 289 for (int k = 0; k < 2; k++) { 290 pf_counter_u64_deinit(&kif->pfik_packets[i][j][k]); 291 pf_counter_u64_deinit(&kif->pfik_bytes[i][j][k]); 292 } 293 } 294 } 295 296 free(kif, PFI_MTYPE); 297 } 298 299 void 300 pf_kkif_zero(struct pfi_kkif *kif) 301 { 302 303 for (int i = 0; i < 2; i++) { 304 for (int j = 0; j < 2; j++) { 305 for (int k = 0; k < 2; k++) { 306 pf_counter_u64_zero(&kif->pfik_packets[i][j][k]); 307 pf_counter_u64_zero(&kif->pfik_bytes[i][j][k]); 308 } 309 } 310 } 311 kif->pfik_tzero = time_second; 312 } 313 314 struct pfi_kkif * 315 pfi_kkif_find(const char *kif_name) 316 { 317 struct pfi_kif_cmp s; 318 319 PF_RULES_ASSERT(); 320 321 memset(&s, 0, sizeof(s)); 322 strlcpy(s.pfik_name, kif_name, sizeof(s.pfik_name)); 323 324 return (RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kkif *)&s)); 325 } 326 327 struct pfi_kkif * 328 pfi_kkif_attach(struct pfi_kkif *kif, const char *kif_name) 329 { 330 struct pfi_kkif *kif1; 331 332 PF_RULES_WASSERT(); 333 KASSERT(kif != NULL, ("%s: null kif", __func__)); 334 335 kif1 = pfi_kkif_find(kif_name); 336 if (kif1 != NULL) { 337 pf_kkif_free(kif); 338 return (kif1); 339 } 340 341 pf_kkif_zero(kif); 342 strlcpy(kif->pfik_name, kif_name, sizeof(kif->pfik_name)); 343 /* 344 * It seems that the value of time_second is in unintialzied state 345 * when pf sets interface statistics clear time in boot phase if pf 346 * was statically linked to kernel. Instead of setting the bogus 347 * time value have pfi_get_ifaces handle this case. In 348 * pfi_get_ifaces it uses time_second if it sees the time is 0. 349 */ 350 kif->pfik_tzero = time_second > 1 ? time_second : 0; 351 TAILQ_INIT(&kif->pfik_dynaddrs); 352 353 RB_INSERT(pfi_ifhead, &V_pfi_ifs, kif); 354 355 return (kif); 356 } 357 358 void 359 pfi_kkif_ref(struct pfi_kkif *kif) 360 { 361 362 PF_RULES_WASSERT(); 363 kif->pfik_rulerefs++; 364 } 365 366 static void 367 pfi_kkif_remove_if_unref(struct pfi_kkif *kif) 368 { 369 370 PF_RULES_WASSERT(); 371 372 if (kif->pfik_rulerefs > 0) 373 return; 374 375 /* kif referencing an existing ifnet or group or holding flags should 376 * exist. */ 377 if (kif->pfik_ifp != NULL || kif->pfik_group != NULL || 378 kif == V_pfi_all || kif->pfik_flags != 0) 379 return; 380 381 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif); 382 383 kif->pfik_flags |= PFI_IFLAG_REFS; 384 385 mtx_lock(&pfi_unlnkdkifs_mtx); 386 LIST_INSERT_HEAD(&V_pfi_unlinked_kifs, kif, pfik_list); 387 mtx_unlock(&pfi_unlnkdkifs_mtx); 388 } 389 390 void 391 pfi_kkif_unref(struct pfi_kkif *kif) 392 { 393 394 PF_RULES_WASSERT(); 395 KASSERT(kif->pfik_rulerefs > 0, ("%s: %p has zero refs", __func__, kif)); 396 397 kif->pfik_rulerefs--; 398 399 pfi_kkif_remove_if_unref(kif); 400 } 401 402 void 403 pfi_kkif_purge(void) 404 { 405 struct pfi_kkif *kif, *kif1; 406 407 /* 408 * Do naive mark-and-sweep garbage collecting of old kifs. 409 * Reference flag is raised by pf_purge_expired_states(). 410 */ 411 mtx_lock(&pfi_unlnkdkifs_mtx); 412 LIST_FOREACH_SAFE(kif, &V_pfi_unlinked_kifs, pfik_list, kif1) { 413 if (!(kif->pfik_flags & PFI_IFLAG_REFS)) { 414 LIST_REMOVE(kif, pfik_list); 415 pf_kkif_free(kif); 416 } else 417 kif->pfik_flags &= ~PFI_IFLAG_REFS; 418 } 419 mtx_unlock(&pfi_unlnkdkifs_mtx); 420 } 421 422 int 423 pfi_kkif_match(struct pfi_kkif *rule_kif, struct pfi_kkif *packet_kif) 424 { 425 struct ifg_list *p; 426 427 NET_EPOCH_ASSERT(); 428 429 MPASS(packet_kif != NULL); 430 MPASS(packet_kif->pfik_ifp != NULL); 431 432 if (rule_kif == NULL || rule_kif == packet_kif) 433 return (1); 434 435 if (rule_kif->pfik_group != NULL) { 436 CK_STAILQ_FOREACH(p, &packet_kif->pfik_ifp->if_groups, ifgl_next) 437 if (p->ifgl_group == rule_kif->pfik_group) 438 return (1); 439 } 440 441 return (0); 442 } 443 444 static void 445 pfi_attach_ifnet(struct ifnet *ifp, struct pfi_kkif *kif) 446 { 447 448 PF_RULES_WASSERT(); 449 450 V_pfi_update++; 451 kif = pfi_kkif_attach(kif, ifp->if_xname); 452 if_ref(ifp); 453 kif->pfik_ifp = ifp; 454 ifp->if_pf_kif = kif; 455 pfi_kkif_update(kif); 456 } 457 458 static void 459 pfi_attach_ifgroup(struct ifg_group *ifg, struct pfi_kkif *kif) 460 { 461 462 PF_RULES_WASSERT(); 463 464 V_pfi_update++; 465 kif = pfi_kkif_attach(kif, ifg->ifg_group); 466 kif->pfik_group = ifg; 467 ifg->ifg_pf_kif = kif; 468 } 469 470 int 471 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af) 472 { 473 switch (af) { 474 #ifdef INET 475 case AF_INET: 476 switch (dyn->pfid_acnt4) { 477 case 0: 478 return (0); 479 case 1: 480 return (PF_MATCHA(0, &dyn->pfid_addr4, 481 &dyn->pfid_mask4, a, AF_INET)); 482 default: 483 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET)); 484 } 485 break; 486 #endif /* INET */ 487 #ifdef INET6 488 case AF_INET6: 489 switch (dyn->pfid_acnt6) { 490 case 0: 491 return (0); 492 case 1: 493 return (PF_MATCHA(0, &dyn->pfid_addr6, 494 &dyn->pfid_mask6, a, AF_INET6)); 495 default: 496 return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6)); 497 } 498 break; 499 #endif /* INET6 */ 500 default: 501 return (0); 502 } 503 } 504 505 int 506 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af) 507 { 508 struct epoch_tracker et; 509 struct pfi_dynaddr *dyn; 510 char tblname[PF_TABLE_NAME_SIZE]; 511 struct pf_kruleset *ruleset = NULL; 512 struct pfi_kkif *kif; 513 int rv = 0; 514 515 PF_RULES_WASSERT(); 516 KASSERT(aw->type == PF_ADDR_DYNIFTL, ("%s: type %u", 517 __func__, aw->type)); 518 KASSERT(aw->p.dyn == NULL, ("%s: dyn is %p", __func__, aw->p.dyn)); 519 520 if ((dyn = malloc(sizeof(*dyn), PFI_MTYPE, M_NOWAIT | M_ZERO)) == NULL) 521 return (ENOMEM); 522 523 if ((kif = pf_kkif_create(M_NOWAIT)) == NULL) { 524 free(dyn, PFI_MTYPE); 525 return (ENOMEM); 526 } 527 528 if (!strcmp(aw->v.ifname, "self")) 529 dyn->pfid_kif = pfi_kkif_attach(kif, IFG_ALL); 530 else 531 dyn->pfid_kif = pfi_kkif_attach(kif, aw->v.ifname); 532 kif = NULL; 533 pfi_kkif_ref(dyn->pfid_kif); 534 535 dyn->pfid_net = pfi_unmask(&aw->v.a.mask); 536 if (af == AF_INET && dyn->pfid_net == 32) 537 dyn->pfid_net = 128; 538 strlcpy(tblname, aw->v.ifname, sizeof(tblname)); 539 if (aw->iflags & PFI_AFLAG_NETWORK) 540 strlcat(tblname, ":network", sizeof(tblname)); 541 if (aw->iflags & PFI_AFLAG_BROADCAST) 542 strlcat(tblname, ":broadcast", sizeof(tblname)); 543 if (aw->iflags & PFI_AFLAG_PEER) 544 strlcat(tblname, ":peer", sizeof(tblname)); 545 if (aw->iflags & PFI_AFLAG_NOALIAS) 546 strlcat(tblname, ":0", sizeof(tblname)); 547 if (dyn->pfid_net != 128) 548 snprintf(tblname + strlen(tblname), 549 sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net); 550 if ((ruleset = pf_find_or_create_kruleset(PF_RESERVED_ANCHOR)) == NULL) { 551 rv = ENOMEM; 552 goto _bad; 553 } 554 555 if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) { 556 rv = ENOMEM; 557 goto _bad; 558 } 559 560 dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE; 561 dyn->pfid_iflags = aw->iflags; 562 dyn->pfid_af = af; 563 564 TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry); 565 aw->p.dyn = dyn; 566 NET_EPOCH_ENTER(et); 567 pfi_kkif_update(dyn->pfid_kif); 568 NET_EPOCH_EXIT(et); 569 570 return (0); 571 572 _bad: 573 if (dyn->pfid_kt != NULL) 574 pfr_detach_table(dyn->pfid_kt); 575 if (ruleset != NULL) 576 pf_remove_if_empty_kruleset(ruleset); 577 pfi_kkif_unref(dyn->pfid_kif); 578 free(dyn, PFI_MTYPE); 579 580 return (rv); 581 } 582 583 static void 584 pfi_kkif_update(struct pfi_kkif *kif) 585 { 586 struct ifg_list *ifgl; 587 struct ifg_member *ifgm; 588 struct pfi_dynaddr *p; 589 struct pfi_kkif *tmpkif; 590 591 NET_EPOCH_ASSERT(); 592 PF_RULES_WASSERT(); 593 594 /* update all dynaddr */ 595 TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry) 596 pfi_dynaddr_update(p); 597 598 /* Apply group flags to new members. */ 599 if (kif->pfik_group != NULL) { 600 CK_STAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, 601 ifgm_next) { 602 tmpkif = (struct pfi_kkif *)ifgm->ifgm_ifp->if_pf_kif; 603 if (tmpkif == NULL) 604 continue; 605 606 tmpkif->pfik_flags |= kif->pfik_flags; 607 } 608 } 609 610 /* again for all groups kif is member of */ 611 if (kif->pfik_ifp != NULL) { 612 CK_STAILQ_FOREACH(ifgl, &kif->pfik_ifp->if_groups, ifgl_next) 613 pfi_kkif_update((struct pfi_kkif *) 614 ifgl->ifgl_group->ifg_pf_kif); 615 } 616 } 617 618 static void 619 pfi_dynaddr_update(struct pfi_dynaddr *dyn) 620 { 621 struct pfi_kkif *kif; 622 struct pfr_ktable *kt; 623 624 PF_RULES_WASSERT(); 625 KASSERT(dyn && dyn->pfid_kif && dyn->pfid_kt, 626 ("%s: bad argument", __func__)); 627 628 kif = dyn->pfid_kif; 629 kt = dyn->pfid_kt; 630 631 if (kt->pfrkt_larg != V_pfi_update) { 632 /* this table needs to be brought up-to-date */ 633 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags); 634 kt->pfrkt_larg = V_pfi_update; 635 } 636 pfr_dynaddr_update(kt, dyn); 637 } 638 639 static void 640 pfi_table_update(struct pfr_ktable *kt, struct pfi_kkif *kif, int net, int flags) 641 { 642 int e, size2 = 0; 643 struct ifg_member *ifgm; 644 645 NET_EPOCH_ASSERT(); 646 647 V_pfi_buffer_cnt = 0; 648 649 if (kif->pfik_ifp != NULL) 650 pfi_instance_add(kif->pfik_ifp, net, flags); 651 else if (kif->pfik_group != NULL) { 652 CK_STAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, ifgm_next) 653 pfi_instance_add(ifgm->ifgm_ifp, net, flags); 654 } 655 656 if ((e = pfr_set_addrs(&kt->pfrkt_t, V_pfi_buffer, V_pfi_buffer_cnt, &size2, 657 NULL, NULL, NULL, 0, PFR_TFLAG_ALLMASK))) 658 printf("%s: cannot set %d new addresses into table %s: %d\n", 659 __func__, V_pfi_buffer_cnt, kt->pfrkt_name, e); 660 } 661 662 static void 663 pfi_instance_add(struct ifnet *ifp, int net, int flags) 664 { 665 struct ifaddr *ia; 666 int got4 = 0, got6 = 0; 667 int net2, af; 668 669 NET_EPOCH_ASSERT(); 670 671 CK_STAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_link) { 672 if (ia->ifa_addr == NULL) 673 continue; 674 af = ia->ifa_addr->sa_family; 675 if (af != AF_INET && af != AF_INET6) 676 continue; 677 /* 678 * XXX: For point-to-point interfaces, (ifname:0) and IPv4, 679 * jump over addresses without a proper route to work 680 * around a problem with ppp not fully removing the 681 * address used during IPCP. 682 */ 683 if ((ifp->if_flags & IFF_POINTOPOINT) && 684 !(ia->ifa_flags & IFA_ROUTE) && 685 (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET)) 686 continue; 687 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6) 688 continue; 689 if ((flags & PFI_AFLAG_BROADCAST) && 690 !(ifp->if_flags & IFF_BROADCAST)) 691 continue; 692 if ((flags & PFI_AFLAG_PEER) && 693 !(ifp->if_flags & IFF_POINTOPOINT)) 694 continue; 695 if ((flags & (PFI_AFLAG_NETWORK | PFI_AFLAG_NOALIAS)) && 696 af == AF_INET6 && 697 IN6_IS_ADDR_LINKLOCAL( 698 &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr)) 699 continue; 700 if (flags & PFI_AFLAG_NOALIAS) { 701 if (af == AF_INET && got4) 702 continue; 703 if (af == AF_INET6 && got6) 704 continue; 705 } 706 if (af == AF_INET) 707 got4 = 1; 708 else if (af == AF_INET6) 709 got6 = 1; 710 net2 = net; 711 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) { 712 if (af == AF_INET) 713 net2 = pfi_unmask(&((struct sockaddr_in *) 714 ia->ifa_netmask)->sin_addr); 715 else if (af == AF_INET6) 716 net2 = pfi_unmask(&((struct sockaddr_in6 *) 717 ia->ifa_netmask)->sin6_addr); 718 } 719 if (af == AF_INET && net2 > 32) 720 net2 = 32; 721 if (flags & PFI_AFLAG_BROADCAST) 722 pfi_address_add(ia->ifa_broadaddr, af, net2); 723 else if (flags & PFI_AFLAG_PEER) 724 pfi_address_add(ia->ifa_dstaddr, af, net2); 725 else 726 pfi_address_add(ia->ifa_addr, af, net2); 727 } 728 } 729 730 static void 731 pfi_address_add(struct sockaddr *sa, int af, int net) 732 { 733 struct pfr_addr *p; 734 int i; 735 736 if (V_pfi_buffer_cnt >= V_pfi_buffer_max) { 737 int new_max = V_pfi_buffer_max * 2; 738 739 if (new_max > PFI_BUFFER_MAX) { 740 printf("%s: address buffer full (%d/%d)\n", __func__, 741 V_pfi_buffer_cnt, PFI_BUFFER_MAX); 742 return; 743 } 744 p = malloc(new_max * sizeof(*V_pfi_buffer), PFI_MTYPE, 745 M_NOWAIT); 746 if (p == NULL) { 747 printf("%s: no memory to grow buffer (%d/%d)\n", 748 __func__, V_pfi_buffer_cnt, PFI_BUFFER_MAX); 749 return; 750 } 751 memcpy(p, V_pfi_buffer, V_pfi_buffer_max * sizeof(*V_pfi_buffer)); 752 /* no need to zero buffer */ 753 free(V_pfi_buffer, PFI_MTYPE); 754 V_pfi_buffer = p; 755 V_pfi_buffer_max = new_max; 756 } 757 if (af == AF_INET && net > 32) 758 net = 128; 759 p = V_pfi_buffer + V_pfi_buffer_cnt++; 760 memset(p, 0, sizeof(*p)); 761 p->pfra_af = af; 762 p->pfra_net = net; 763 if (af == AF_INET) 764 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr; 765 else if (af == AF_INET6) { 766 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr; 767 if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr)) 768 p->pfra_ip6addr.s6_addr16[1] = 0; 769 } 770 /* mask network address bits */ 771 if (net < 128) 772 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8)); 773 for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++) 774 ((caddr_t)p)[i] = 0; 775 } 776 777 void 778 pfi_dynaddr_remove(struct pfi_dynaddr *dyn) 779 { 780 781 KASSERT(dyn->pfid_kif != NULL, ("%s: null pfid_kif", __func__)); 782 KASSERT(dyn->pfid_kt != NULL, ("%s: null pfid_kt", __func__)); 783 784 TAILQ_REMOVE(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry); 785 pfi_kkif_unref(dyn->pfid_kif); 786 pfr_detach_table(dyn->pfid_kt); 787 free(dyn, PFI_MTYPE); 788 } 789 790 void 791 pfi_dynaddr_copyout(struct pf_addr_wrap *aw) 792 { 793 794 KASSERT(aw->type == PF_ADDR_DYNIFTL, 795 ("%s: type %u", __func__, aw->type)); 796 797 if (aw->p.dyn == NULL || aw->p.dyn->pfid_kif == NULL) 798 return; 799 aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6; 800 } 801 802 static int 803 pfi_kkif_compare(struct pfi_kkif *p, struct pfi_kkif *q) 804 { 805 return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ)); 806 } 807 808 void 809 pfi_update_status(const char *name, struct pf_status *pfs) 810 { 811 struct pfi_kkif *p; 812 struct pfi_kif_cmp key; 813 struct ifg_member p_member, *ifgm; 814 CK_STAILQ_HEAD(, ifg_member) ifg_members; 815 int i, j, k; 816 817 if (pfs) { 818 memset(pfs->pcounters, 0, sizeof(pfs->pcounters)); 819 memset(pfs->bcounters, 0, sizeof(pfs->bcounters)); 820 } 821 822 strlcpy(key.pfik_name, name, sizeof(key.pfik_name)); 823 p = RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kkif *)&key); 824 if (p == NULL) { 825 return; 826 } 827 828 if (p->pfik_group != NULL) { 829 memcpy(&ifg_members, &p->pfik_group->ifg_members, 830 sizeof(ifg_members)); 831 } else { 832 /* build a temporary list for p only */ 833 memset(&p_member, 0, sizeof(p_member)); 834 p_member.ifgm_ifp = p->pfik_ifp; 835 CK_STAILQ_INIT(&ifg_members); 836 CK_STAILQ_INSERT_TAIL(&ifg_members, &p_member, ifgm_next); 837 } 838 CK_STAILQ_FOREACH(ifgm, &ifg_members, ifgm_next) { 839 if (ifgm->ifgm_ifp == NULL || ifgm->ifgm_ifp->if_pf_kif == NULL) 840 continue; 841 p = (struct pfi_kkif *)ifgm->ifgm_ifp->if_pf_kif; 842 843 /* just clear statistics */ 844 if (pfs == NULL) { 845 pf_kkif_zero(p); 846 continue; 847 } 848 for (i = 0; i < 2; i++) 849 for (j = 0; j < 2; j++) 850 for (k = 0; k < 2; k++) { 851 pfs->pcounters[i][j][k] += 852 pf_counter_u64_fetch(&p->pfik_packets[i][j][k]); 853 pfs->bcounters[i][j] += 854 pf_counter_u64_fetch(&p->pfik_bytes[i][j][k]); 855 } 856 } 857 } 858 859 static void 860 pf_kkif_to_kif(struct pfi_kkif *kkif, struct pfi_kif *kif) 861 { 862 863 memset(kif, 0, sizeof(*kif)); 864 strlcpy(kif->pfik_name, kkif->pfik_name, sizeof(kif->pfik_name)); 865 for (int i = 0; i < 2; i++) { 866 for (int j = 0; j < 2; j++) { 867 for (int k = 0; k < 2; k++) { 868 kif->pfik_packets[i][j][k] = 869 pf_counter_u64_fetch(&kkif->pfik_packets[i][j][k]); 870 kif->pfik_bytes[i][j][k] = 871 pf_counter_u64_fetch(&kkif->pfik_bytes[i][j][k]); 872 } 873 } 874 } 875 kif->pfik_flags = kkif->pfik_flags; 876 kif->pfik_tzero = kkif->pfik_tzero; 877 kif->pfik_rulerefs = kkif->pfik_rulerefs; 878 /* 879 * Userspace relies on this pointer to decide if this is a group or 880 * not. We don't want to share the actual pointer, because it's 881 * useless to userspace and leaks kernel memory layout information. 882 * So instead we provide 0xfeedcode as 'true' and NULL as 'false'. 883 */ 884 kif->pfik_group = 885 kkif->pfik_group ? (struct ifg_group *)0xfeedc0de : NULL; 886 } 887 888 void 889 pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size) 890 { 891 struct epoch_tracker et; 892 struct pfi_kkif *p, *nextp; 893 int n = 0; 894 895 NET_EPOCH_ENTER(et); 896 for (p = RB_MIN(pfi_ifhead, &V_pfi_ifs); p; p = nextp) { 897 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p); 898 if (pfi_skip_if(name, p)) 899 continue; 900 if (*size <= n++) 901 break; 902 if (!p->pfik_tzero) 903 p->pfik_tzero = time_second; 904 pf_kkif_to_kif(p, buf++); 905 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p); 906 } 907 *size = n; 908 NET_EPOCH_EXIT(et); 909 } 910 911 static int 912 pfi_skip_if(const char *filter, struct pfi_kkif *p) 913 { 914 struct ifg_list *i; 915 int n; 916 917 NET_EPOCH_ASSERT(); 918 919 if (filter == NULL || !*filter) 920 return (0); 921 if (!strcmp(p->pfik_name, filter)) 922 return (0); /* exact match */ 923 n = strlen(filter); 924 if (n < 1 || n >= IFNAMSIZ) 925 return (1); /* sanity check */ 926 if (filter[n-1] >= '0' && filter[n-1] <= '9') 927 return (1); /* group names may not end in a digit */ 928 if (p->pfik_ifp == NULL) 929 return (1); 930 CK_STAILQ_FOREACH(i, &p->pfik_ifp->if_groups, ifgl_next) 931 if (!strncmp(i->ifgl_group->ifg_group, filter, IFNAMSIZ)) 932 return (0); /* iface is in group "filter" */ 933 return (1); 934 } 935 936 int 937 pfi_set_flags(const char *name, int flags) 938 { 939 struct epoch_tracker et; 940 struct pfi_kkif *p, *kif; 941 942 kif = pf_kkif_create(M_NOWAIT); 943 if (kif == NULL) 944 return (ENOMEM); 945 946 NET_EPOCH_ENTER(et); 947 948 kif = pfi_kkif_attach(kif, name); 949 950 RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) { 951 if (pfi_skip_if(name, p)) 952 continue; 953 p->pfik_flags |= flags; 954 } 955 NET_EPOCH_EXIT(et); 956 return (0); 957 } 958 959 int 960 pfi_clear_flags(const char *name, int flags) 961 { 962 struct epoch_tracker et; 963 struct pfi_kkif *p, *tmp; 964 965 NET_EPOCH_ENTER(et); 966 RB_FOREACH_SAFE(p, pfi_ifhead, &V_pfi_ifs, tmp) { 967 if (pfi_skip_if(name, p)) 968 continue; 969 p->pfik_flags &= ~flags; 970 971 if (p->pfik_ifp == NULL && p->pfik_group == NULL && 972 p->pfik_flags == 0 && p->pfik_rulerefs == 0) { 973 /* Delete this kif. */ 974 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, p); 975 pf_kkif_free(p); 976 } 977 } 978 NET_EPOCH_EXIT(et); 979 return (0); 980 } 981 982 /* from pf_print_state.c */ 983 static int 984 pfi_unmask(void *addr) 985 { 986 struct pf_addr *m = addr; 987 int i = 31, j = 0, b = 0; 988 u_int32_t tmp; 989 990 while (j < 4 && m->addr32[j] == 0xffffffff) { 991 b += 32; 992 j++; 993 } 994 if (j < 4) { 995 tmp = ntohl(m->addr32[j]); 996 for (i = 31; tmp & (1 << i); --i) 997 b++; 998 } 999 return (b); 1000 } 1001 1002 static void 1003 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp) 1004 { 1005 struct epoch_tracker et; 1006 struct pfi_kkif *kif; 1007 1008 if (V_pf_vnet_active == 0) { 1009 /* Avoid teardown race in the least expensive way. */ 1010 return; 1011 } 1012 kif = pf_kkif_create(M_NOWAIT); 1013 NET_EPOCH_ENTER(et); 1014 PF_RULES_WLOCK(); 1015 pfi_attach_ifnet(ifp, kif); 1016 #ifdef ALTQ 1017 pf_altq_ifnet_event(ifp, 0); 1018 #endif 1019 PF_RULES_WUNLOCK(); 1020 NET_EPOCH_EXIT(et); 1021 } 1022 1023 static void 1024 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp) 1025 { 1026 struct epoch_tracker et; 1027 struct pfi_kkif *kif = (struct pfi_kkif *)ifp->if_pf_kif; 1028 1029 if (pfsync_detach_ifnet_ptr) 1030 pfsync_detach_ifnet_ptr(ifp); 1031 1032 if (kif == NULL) 1033 return; 1034 1035 if (V_pf_vnet_active == 0) { 1036 /* Avoid teardown race in the least expensive way. */ 1037 return; 1038 } 1039 1040 NET_EPOCH_ENTER(et); 1041 PF_RULES_WLOCK(); 1042 V_pfi_update++; 1043 pfi_kkif_update(kif); 1044 1045 if (kif->pfik_ifp) 1046 if_rele(kif->pfik_ifp); 1047 1048 kif->pfik_ifp = NULL; 1049 ifp->if_pf_kif = NULL; 1050 #ifdef ALTQ 1051 pf_altq_ifnet_event(ifp, 1); 1052 #endif 1053 pfi_kkif_remove_if_unref(kif); 1054 1055 PF_RULES_WUNLOCK(); 1056 NET_EPOCH_EXIT(et); 1057 } 1058 1059 static void 1060 pfi_attach_group_event(void *arg __unused, struct ifg_group *ifg) 1061 { 1062 struct epoch_tracker et; 1063 struct pfi_kkif *kif; 1064 1065 if (V_pf_vnet_active == 0) { 1066 /* Avoid teardown race in the least expensive way. */ 1067 return; 1068 } 1069 kif = pf_kkif_create(M_WAITOK); 1070 NET_EPOCH_ENTER(et); 1071 PF_RULES_WLOCK(); 1072 pfi_attach_ifgroup(ifg, kif); 1073 PF_RULES_WUNLOCK(); 1074 NET_EPOCH_EXIT(et); 1075 } 1076 1077 static void 1078 pfi_change_group_event(void *arg __unused, char *gname) 1079 { 1080 struct epoch_tracker et; 1081 struct pfi_kkif *kif; 1082 1083 if (V_pf_vnet_active == 0) { 1084 /* Avoid teardown race in the least expensive way. */ 1085 return; 1086 } 1087 1088 kif = pf_kkif_create(M_WAITOK); 1089 NET_EPOCH_ENTER(et); 1090 PF_RULES_WLOCK(); 1091 V_pfi_update++; 1092 kif = pfi_kkif_attach(kif, gname); 1093 pfi_kkif_update(kif); 1094 PF_RULES_WUNLOCK(); 1095 NET_EPOCH_EXIT(et); 1096 } 1097 1098 static void 1099 pfi_detach_group_event(void *arg __unused, struct ifg_group *ifg) 1100 { 1101 struct pfi_kkif *kif = (struct pfi_kkif *)ifg->ifg_pf_kif; 1102 1103 if (kif == NULL) 1104 return; 1105 1106 if (V_pf_vnet_active == 0) { 1107 /* Avoid teardown race in the least expensive way. */ 1108 return; 1109 } 1110 PF_RULES_WLOCK(); 1111 V_pfi_update++; 1112 1113 kif->pfik_group = NULL; 1114 ifg->ifg_pf_kif = NULL; 1115 1116 pfi_kkif_remove_if_unref(kif); 1117 PF_RULES_WUNLOCK(); 1118 } 1119 1120 static void 1121 pfi_ifaddr_event(void *arg __unused, struct ifnet *ifp) 1122 { 1123 1124 KASSERT(ifp, ("ifp == NULL")); 1125 1126 if (ifp->if_pf_kif == NULL) 1127 return; 1128 1129 if (V_pf_vnet_active == 0) { 1130 /* Avoid teardown race in the least expensive way. */ 1131 return; 1132 } 1133 PF_RULES_WLOCK(); 1134 if (ifp->if_pf_kif) { 1135 struct epoch_tracker et; 1136 1137 V_pfi_update++; 1138 NET_EPOCH_ENTER(et); 1139 pfi_kkif_update(ifp->if_pf_kif); 1140 NET_EPOCH_EXIT(et); 1141 } 1142 PF_RULES_WUNLOCK(); 1143 } 1144