1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2023 Alexander V. Chernikov <melifaro@FreeBSD.org> 5 * Copyright (c) 2023 Rubicon Communications, LLC (Netgate) 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 */ 29 30 #include <sys/param.h> 31 #include <sys/malloc.h> 32 #include <sys/mbuf.h> 33 #include <sys/priv.h> 34 #include <sys/socket.h> 35 #include <sys/ucred.h> 36 37 #include <net/pfvar.h> 38 39 #include <netlink/netlink.h> 40 #include <netlink/netlink_ctl.h> 41 #include <netlink/netlink_generic.h> 42 #include <netlink/netlink_message_writer.h> 43 44 #include <netpfil/pf/pf_nl.h> 45 46 #define DEBUG_MOD_NAME nl_pf 47 #define DEBUG_MAX_LEVEL LOG_DEBUG3 48 #include <netlink/netlink_debug.h> 49 _DECLARE_DEBUG(LOG_DEBUG); 50 51 struct nl_parsed_state { 52 uint8_t version; 53 uint32_t id; 54 uint32_t creatorid; 55 char ifname[IFNAMSIZ]; 56 uint16_t proto; 57 sa_family_t af; 58 struct pf_addr addr; 59 struct pf_addr mask; 60 }; 61 62 #define _IN(_field) offsetof(struct genlmsghdr, _field) 63 #define _OUT(_field) offsetof(struct nl_parsed_state, _field) 64 static const struct nlattr_parser nla_p_state[] = { 65 { .type = PF_ST_ID, .off = _OUT(id), .cb = nlattr_get_uint32 }, 66 { .type = PF_ST_CREATORID, .off = _OUT(creatorid), .cb = nlattr_get_uint32 }, 67 { .type = PF_ST_IFNAME, .arg = (const void *)IFNAMSIZ, .off = _OUT(ifname), .cb = nlattr_get_chara }, 68 { .type = PF_ST_AF, .off = _OUT(proto), .cb = nlattr_get_uint8 }, 69 { .type = PF_ST_PROTO, .off = _OUT(proto), .cb = nlattr_get_uint16 }, 70 { .type = PF_ST_FILTER_ADDR, .off = _OUT(addr), .cb = nlattr_get_in6_addr }, 71 { .type = PF_ST_FILTER_MASK, .off = _OUT(mask), .cb = nlattr_get_in6_addr }, 72 }; 73 static const struct nlfield_parser nlf_p_generic[] = { 74 { .off_in = _IN(version), .off_out = _OUT(version), .cb = nlf_get_u8 }, 75 }; 76 #undef _IN 77 #undef _OUT 78 NL_DECLARE_PARSER(state_parser, struct genlmsghdr, nlf_p_generic, nla_p_state); 79 80 static void 81 dump_addr(struct nl_writer *nw, int attr, const struct pf_addr *addr, int af) 82 { 83 switch (af) { 84 case AF_INET: 85 nlattr_add(nw, attr, 4, &addr->v4); 86 break; 87 case AF_INET6: 88 nlattr_add(nw, attr, 16, &addr->v6); 89 break; 90 }; 91 } 92 93 static bool 94 dump_state_peer(struct nl_writer *nw, int attr, const struct pf_state_peer *peer) 95 { 96 int off = nlattr_add_nested(nw, attr); 97 if (off == 0) 98 return (false); 99 100 nlattr_add_u32(nw, PF_STP_SEQLO, peer->seqlo); 101 nlattr_add_u32(nw, PF_STP_SEQHI, peer->seqhi); 102 nlattr_add_u32(nw, PF_STP_SEQDIFF, peer->seqdiff); 103 nlattr_add_u16(nw, PF_STP_MAX_WIN, peer->max_win); 104 nlattr_add_u16(nw, PF_STP_MSS, peer->mss); 105 nlattr_add_u8(nw, PF_STP_STATE, peer->state); 106 nlattr_add_u8(nw, PF_STP_WSCALE, peer->wscale); 107 108 if (peer->scrub != NULL) { 109 struct pf_state_scrub *sc = peer->scrub; 110 uint16_t pfss_flags = sc->pfss_flags & PFSS_TIMESTAMP; 111 112 nlattr_add_u16(nw, PF_STP_PFSS_FLAGS, pfss_flags); 113 nlattr_add_u32(nw, PF_STP_PFSS_TS_MOD, sc->pfss_ts_mod); 114 nlattr_add_u8(nw, PF_STP_PFSS_TTL, sc->pfss_ttl); 115 nlattr_add_u8(nw, PF_STP_SCRUB_FLAG, PFSYNC_SCRUB_FLAG_VALID); 116 } 117 nlattr_set_len(nw, off); 118 119 return (true); 120 } 121 122 static bool 123 dump_state_key(struct nl_writer *nw, int attr, const struct pf_state_key *key) 124 { 125 int off = nlattr_add_nested(nw, attr); 126 if (off == 0) 127 return (false); 128 129 dump_addr(nw, PF_STK_ADDR0, &key->addr[0], key->af); 130 dump_addr(nw, PF_STK_ADDR1, &key->addr[1], key->af); 131 nlattr_add_u16(nw, PF_STK_PORT0, key->port[0]); 132 nlattr_add_u16(nw, PF_STK_PORT1, key->port[1]); 133 134 nlattr_set_len(nw, off); 135 136 return (true); 137 } 138 139 static int 140 dump_state(struct nlpcb *nlp, const struct nlmsghdr *hdr, struct pf_kstate *s, 141 struct nl_pstate *npt) 142 { 143 struct nl_writer *nw = npt->nw; 144 int error = 0; 145 int af; 146 struct pf_state_key *key; 147 148 if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr))) 149 goto enomem; 150 151 struct genlmsghdr *ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr); 152 ghdr_new->cmd = PFNL_CMD_GETSTATES; 153 ghdr_new->version = 0; 154 ghdr_new->reserved = 0; 155 156 nlattr_add_u64(nw, PF_ST_VERSION, PF_STATE_VERSION); 157 158 key = s->key[PF_SK_WIRE]; 159 if (!dump_state_key(nw, PF_ST_KEY_WIRE, key)) 160 goto enomem; 161 key = s->key[PF_SK_STACK]; 162 if (!dump_state_key(nw, PF_ST_KEY_STACK, key)) 163 goto enomem; 164 165 af = s->key[PF_SK_WIRE]->af; 166 nlattr_add_u8(nw, PF_ST_PROTO, s->key[PF_SK_WIRE]->proto); 167 nlattr_add_u8(nw, PF_ST_AF, af); 168 169 nlattr_add_string(nw, PF_ST_IFNAME, s->kif->pfik_name); 170 nlattr_add_string(nw, PF_ST_ORIG_IFNAME, s->orig_kif->pfik_name); 171 dump_addr(nw, PF_ST_RT_ADDR, &s->rt_addr, af); 172 nlattr_add_u32(nw, PF_ST_CREATION, time_uptime - s->creation); 173 uint32_t expire = pf_state_expires(s); 174 if (expire > time_uptime) 175 expire = expire - time_uptime; 176 nlattr_add_u32(nw, PF_ST_EXPIRE, expire); 177 nlattr_add_u8(nw, PF_ST_DIRECTION, s->direction); 178 nlattr_add_u8(nw, PF_ST_LOG, s->act.log); 179 nlattr_add_u8(nw, PF_ST_TIMEOUT, s->timeout); 180 nlattr_add_u16(nw, PF_ST_STATE_FLAGS, s->state_flags); 181 uint8_t sync_flags = 0; 182 if (s->src_node) 183 sync_flags |= PFSYNC_FLAG_SRCNODE; 184 if (s->nat_src_node) 185 sync_flags |= PFSYNC_FLAG_NATSRCNODE; 186 nlattr_add_u8(nw, PF_ST_SYNC_FLAGS, sync_flags); 187 nlattr_add_u64(nw, PF_ST_ID, s->id); 188 nlattr_add_u32(nw, PF_ST_CREATORID, htonl(s->creatorid)); 189 190 nlattr_add_u32(nw, PF_ST_RULE, s->rule.ptr ? s->rule.ptr->nr : -1); 191 nlattr_add_u32(nw, PF_ST_ANCHOR, s->anchor.ptr ? s->anchor.ptr->nr : -1); 192 nlattr_add_u32(nw, PF_ST_NAT_RULE, s->nat_rule.ptr ? s->nat_rule.ptr->nr : -1); 193 194 nlattr_add_u64(nw, PF_ST_PACKETS0, s->packets[0]); 195 nlattr_add_u64(nw, PF_ST_PACKETS1, s->packets[1]); 196 nlattr_add_u64(nw, PF_ST_BYTES0, s->bytes[0]); 197 nlattr_add_u64(nw, PF_ST_BYTES1, s->bytes[1]); 198 nlattr_add_u32(nw, PF_ST_RTABLEID, s->act.rtableid); 199 nlattr_add_u8(nw, PF_ST_MIN_TTL, s->act.min_ttl); 200 nlattr_add_u16(nw, PF_ST_MAX_MSS, s->act.max_mss); 201 nlattr_add_u16(nw, PF_ST_DNPIPE, s->act.dnpipe); 202 nlattr_add_u16(nw, PF_ST_DNRPIPE, s->act.dnrpipe); 203 nlattr_add_u8(nw, PF_ST_RT, s->rt); 204 if (s->rt_kif != NULL) 205 nlattr_add_string(nw, PF_ST_RT_IFNAME, s->rt_kif->pfik_name); 206 207 if (!dump_state_peer(nw, PF_ST_PEER_SRC, &s->src)) 208 goto enomem; 209 if (!dump_state_peer(nw, PF_ST_PEER_DST, &s->dst)) 210 goto enomem; 211 212 if (nlmsg_end(nw)) 213 return (0); 214 215 enomem: 216 error = ENOMEM; 217 nlmsg_abort(nw); 218 return (error); 219 } 220 221 static int 222 handle_dumpstates(struct nlpcb *nlp, struct nl_parsed_state *attrs, 223 struct nlmsghdr *hdr, struct nl_pstate *npt) 224 { 225 int error = 0; 226 227 hdr->nlmsg_flags |= NLM_F_MULTI; 228 229 for (int i = 0; i <= pf_hashmask; i++) { 230 struct pf_idhash *ih = &V_pf_idhash[i]; 231 struct pf_kstate *s; 232 233 if (LIST_EMPTY(&ih->states)) 234 continue; 235 236 PF_HASHROW_LOCK(ih); 237 LIST_FOREACH(s, &ih->states, entry) { 238 sa_family_t af = s->key[PF_SK_WIRE]->af; 239 240 if (s->timeout == PFTM_UNLINKED) 241 continue; 242 243 /* Filter */ 244 if (attrs->creatorid != 0 && s->creatorid != attrs->creatorid) 245 continue; 246 if (attrs->ifname[0] != 0 && 247 strncmp(attrs->ifname, s->kif->pfik_name, IFNAMSIZ) != 0) 248 continue; 249 if (attrs->proto != 0 && s->key[PF_SK_WIRE]->proto != attrs->proto) 250 continue; 251 if (attrs->af != 0 && af != attrs->af) 252 continue; 253 if (pf_match_addr(1, &s->key[PF_SK_WIRE]->addr[0], 254 &attrs->mask, &attrs->addr, af) && 255 pf_match_addr(1, &s->key[PF_SK_WIRE]->addr[1], 256 &attrs->mask, &attrs->addr, af) && 257 pf_match_addr(1, &s->key[PF_SK_STACK]->addr[0], 258 &attrs->mask, &attrs->addr, af) && 259 pf_match_addr(1, &s->key[PF_SK_STACK]->addr[1], 260 &attrs->mask, &attrs->addr, af)) 261 continue; 262 263 error = dump_state(nlp, hdr, s, npt); 264 if (error != 0) 265 break; 266 } 267 PF_HASHROW_UNLOCK(ih); 268 } 269 270 if (!nlmsg_end_dump(npt->nw, error, hdr)) { 271 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 272 return (ENOMEM); 273 } 274 275 return (error); 276 } 277 278 static int 279 handle_getstate(struct nlpcb *nlp, struct nl_parsed_state *attrs, 280 struct nlmsghdr *hdr, struct nl_pstate *npt) 281 { 282 struct pf_kstate *s = pf_find_state_byid(attrs->id, attrs->creatorid); 283 if (s == NULL) 284 return (ENOENT); 285 return (dump_state(nlp, hdr, s, npt)); 286 } 287 288 static int 289 dump_creatorid(struct nlpcb *nlp, const struct nlmsghdr *hdr, uint32_t creator, 290 struct nl_pstate *npt) 291 { 292 struct nl_writer *nw = npt->nw; 293 294 if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr))) 295 goto enomem; 296 297 struct genlmsghdr *ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr); 298 ghdr_new->cmd = PFNL_CMD_GETCREATORS; 299 ghdr_new->version = 0; 300 ghdr_new->reserved = 0; 301 302 nlattr_add_u32(nw, PF_ST_CREATORID, htonl(creator)); 303 304 if (nlmsg_end(nw)) 305 return (0); 306 307 enomem: 308 nlmsg_abort(nw); 309 return (ENOMEM); 310 } 311 312 static int 313 pf_handle_getstates(struct nlmsghdr *hdr, struct nl_pstate *npt) 314 { 315 int error; 316 317 struct nl_parsed_state attrs = {}; 318 error = nl_parse_nlmsg(hdr, &state_parser, npt, &attrs); 319 if (error != 0) 320 return (error); 321 322 if (attrs.id != 0) 323 error = handle_getstate(npt->nlp, &attrs, hdr, npt); 324 else 325 error = handle_dumpstates(npt->nlp, &attrs, hdr, npt); 326 327 return (error); 328 } 329 330 static int 331 pf_handle_getcreators(struct nlmsghdr *hdr, struct nl_pstate *npt) 332 { 333 uint32_t creators[16]; 334 int error = 0; 335 336 bzero(creators, sizeof(creators)); 337 338 for (int i = 0; i < pf_hashmask; i++) { 339 struct pf_idhash *ih = &V_pf_idhash[i]; 340 struct pf_kstate *s; 341 342 if (LIST_EMPTY(&ih->states)) 343 continue; 344 345 PF_HASHROW_LOCK(ih); 346 LIST_FOREACH(s, &ih->states, entry) { 347 int j; 348 if (s->timeout == PFTM_UNLINKED) 349 continue; 350 351 for (j = 0; j < nitems(creators); j++) { 352 if (creators[j] == s->creatorid) 353 break; 354 if (creators[j] == 0) { 355 creators[j] = s->creatorid; 356 break; 357 } 358 } 359 if (j == nitems(creators)) 360 printf("Warning: too many creators!\n"); 361 } 362 PF_HASHROW_UNLOCK(ih); 363 } 364 365 hdr->nlmsg_flags |= NLM_F_MULTI; 366 for (int i = 0; i < nitems(creators); i++) { 367 if (creators[i] == 0) 368 break; 369 error = dump_creatorid(npt->nlp, hdr, creators[i], npt); 370 } 371 372 if (!nlmsg_end_dump(npt->nw, error, hdr)) { 373 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 374 return (ENOMEM); 375 } 376 377 return (error); 378 } 379 380 static int 381 pf_handle_start(struct nlmsghdr *hdr __unused, struct nl_pstate *npt __unused) 382 { 383 return (pf_start()); 384 } 385 386 static int 387 pf_handle_stop(struct nlmsghdr *hdr __unused, struct nl_pstate *npt __unused) 388 { 389 return (pf_stop()); 390 } 391 392 #define _OUT(_field) offsetof(struct pf_addr_wrap, _field) 393 static const struct nlattr_parser nla_p_addr_wrap[] = { 394 { .type = PF_AT_ADDR, .off = _OUT(v.a.addr), .cb = nlattr_get_in6_addr }, 395 { .type = PF_AT_MASK, .off = _OUT(v.a.mask), .cb = nlattr_get_in6_addr }, 396 { .type = PF_AT_IFNAME, .off = _OUT(v.ifname), .arg = (void *)IFNAMSIZ,.cb = nlattr_get_chara }, 397 { .type = PF_AT_TABLENAME, .off = _OUT(v.tblname), .arg = (void *)PF_TABLE_NAME_SIZE, .cb = nlattr_get_chara }, 398 { .type = PF_AT_TYPE, .off = _OUT(type), .cb = nlattr_get_uint8 }, 399 { .type = PF_AT_IFLAGS, .off = _OUT(iflags), .cb = nlattr_get_uint8 }, 400 }; 401 NL_DECLARE_ATTR_PARSER(addr_wrap_parser, nla_p_addr_wrap); 402 #undef _OUT 403 404 #define _OUT(_field) offsetof(struct pf_rule_addr, _field) 405 static const struct nlattr_parser nla_p_ruleaddr[] = { 406 { .type = PF_RAT_ADDR, .off = _OUT(addr), .arg = &addr_wrap_parser, .cb = nlattr_get_nested }, 407 { .type = PF_RAT_SRC_PORT, .off = _OUT(port[0]), .cb = nlattr_get_uint16 }, 408 { .type = PF_RAT_DST_PORT, .off = _OUT(port[1]), .cb = nlattr_get_uint16 }, 409 { .type = PF_RAT_NEG, .off = _OUT(neg), .cb = nlattr_get_uint8 }, 410 { .type = PF_RAT_OP, .off = _OUT(port_op), .cb = nlattr_get_uint8 }, 411 }; 412 NL_DECLARE_ATTR_PARSER(rule_addr_parser, nla_p_ruleaddr); 413 #undef _OUT 414 415 #define _OUT(_field) offsetof(struct pf_mape_portset, _field) 416 static const struct nlattr_parser nla_p_mape_portset[] = { 417 { .type = PF_MET_OFFSET, .off = _OUT(offset), .cb = nlattr_get_uint8 }, 418 { .type = PF_MET_PSID_LEN, .off = _OUT(psidlen), .cb = nlattr_get_uint8 }, 419 {. type = PF_MET_PSID, .off = _OUT(psid), .cb = nlattr_get_uint16 }, 420 }; 421 NL_DECLARE_ATTR_PARSER(mape_portset_parser, nla_p_mape_portset); 422 #undef _OUT 423 424 struct nl_parsed_labels 425 { 426 char labels[PF_RULE_MAX_LABEL_COUNT][PF_RULE_LABEL_SIZE]; 427 uint32_t i; 428 }; 429 430 static int 431 nlattr_get_pf_rule_labels(struct nlattr *nla, struct nl_pstate *npt, 432 const void *arg, void *target) 433 { 434 struct nl_parsed_labels *l = (struct nl_parsed_labels *)target; 435 int ret; 436 437 if (l->i >= PF_RULE_MAX_LABEL_COUNT) 438 return (E2BIG); 439 440 ret = nlattr_get_chara(nla, npt, (void *)PF_RULE_LABEL_SIZE, 441 l->labels[l->i]); 442 if (ret == 0) 443 l->i++; 444 445 return (ret); 446 } 447 448 #define _OUT(_field) offsetof(struct nl_parsed_labels, _field) 449 static const struct nlattr_parser nla_p_labels[] = { 450 { .type = PF_LT_LABEL, .off = 0, .cb = nlattr_get_pf_rule_labels }, 451 }; 452 NL_DECLARE_ATTR_PARSER(rule_labels_parser, nla_p_labels); 453 #undef _OUT 454 455 static int 456 nlattr_get_nested_pf_rule_labels(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target) 457 { 458 struct nl_parsed_labels parsed_labels = { }; 459 int error; 460 461 /* Assumes target points to the beginning of the structure */ 462 error = nl_parse_header(NLA_DATA(nla), NLA_DATA_LEN(nla), &rule_labels_parser, npt, &parsed_labels); 463 if (error != 0) 464 return (error); 465 466 memcpy(target, parsed_labels.labels, sizeof(parsed_labels)); 467 468 return (0); 469 } 470 471 #define _OUT(_field) offsetof(struct pf_kpool, _field) 472 static const struct nlattr_parser nla_p_pool[] = { 473 { .type = PF_PT_KEY, .off = _OUT(key), .arg = (void *)sizeof(struct pf_poolhashkey), .cb = nlattr_get_bytes }, 474 { .type = PF_PT_COUNTER, .off = _OUT(counter), .cb = nlattr_get_in6_addr }, 475 { .type = PF_PT_TBLIDX, .off = _OUT(tblidx), .cb = nlattr_get_uint32 }, 476 { .type = PF_PT_PROXY_SRC_PORT, .off = _OUT(proxy_port[0]), .cb = nlattr_get_uint16 }, 477 { .type = PF_PT_PROXY_DST_PORT, .off = _OUT(proxy_port[1]), .cb = nlattr_get_uint16 }, 478 { .type = PF_PT_OPTS, .off = _OUT(opts), .cb = nlattr_get_uint8 }, 479 { .type = PF_PT_MAPE, .off = _OUT(mape), .arg = &mape_portset_parser, .cb = nlattr_get_nested }, 480 }; 481 NL_DECLARE_ATTR_PARSER(pool_parser, nla_p_pool); 482 #undef _OUT 483 484 #define _OUT(_field) offsetof(struct pf_rule_uid, _field) 485 static const struct nlattr_parser nla_p_rule_uid[] = { 486 { .type = PF_RUT_UID_LOW, .off = _OUT(uid[0]), .cb = nlattr_get_uint32 }, 487 { .type = PF_RUT_UID_HIGH, .off = _OUT(uid[1]), .cb = nlattr_get_uint32 }, 488 { .type = PF_RUT_OP, .off = _OUT(op), .cb = nlattr_get_uint8 }, 489 }; 490 NL_DECLARE_ATTR_PARSER(rule_uid_parser, nla_p_rule_uid); 491 #undef _OUT 492 493 struct nl_parsed_timeouts 494 { 495 uint32_t timeouts[PFTM_MAX]; 496 uint32_t i; 497 }; 498 499 static int 500 nlattr_get_pf_timeout(struct nlattr *nla, struct nl_pstate *npt, 501 const void *arg, void *target) 502 { 503 struct nl_parsed_timeouts *t = (struct nl_parsed_timeouts *)target; 504 int ret; 505 506 if (t->i >= PFTM_MAX) 507 return (E2BIG); 508 509 ret = nlattr_get_uint32(nla, npt, NULL, &t->timeouts[t->i]); 510 if (ret == 0) 511 t->i++; 512 513 return (ret); 514 } 515 516 #define _OUT(_field) offsetof(struct nl_parsed_timeout, _field) 517 static const struct nlattr_parser nla_p_timeouts[] = { 518 { .type = PF_TT_TIMEOUT, .off = 0, .cb = nlattr_get_pf_timeout }, 519 }; 520 NL_DECLARE_ATTR_PARSER(timeout_parser, nla_p_timeouts); 521 #undef _OUT 522 523 static int 524 nlattr_get_nested_timeouts(struct nlattr *nla, struct nl_pstate *npt, const void *arg, void *target) 525 { 526 struct nl_parsed_timeouts parsed_timeouts = { }; 527 int error; 528 529 /* Assumes target points to the beginning of the structure */ 530 error = nl_parse_header(NLA_DATA(nla), NLA_DATA_LEN(nla), &timeout_parser, npt, &parsed_timeouts); 531 if (error != 0) 532 return (error); 533 534 memcpy(target, parsed_timeouts.timeouts, sizeof(parsed_timeouts.timeouts)); 535 536 return (0); 537 } 538 539 #define _OUT(_field) offsetof(struct pf_krule, _field) 540 static const struct nlattr_parser nla_p_rule[] = { 541 { .type = PF_RT_SRC, .off = _OUT(src), .arg = &rule_addr_parser,.cb = nlattr_get_nested }, 542 { .type = PF_RT_DST, .off = _OUT(dst), .arg = &rule_addr_parser,.cb = nlattr_get_nested }, 543 { .type = PF_RT_RIDENTIFIER, .off = _OUT(ridentifier), .cb = nlattr_get_uint32 }, 544 { .type = PF_RT_LABELS, .off = _OUT(label), .arg = &rule_labels_parser,.cb = nlattr_get_nested_pf_rule_labels }, 545 { .type = PF_RT_IFNAME, .off = _OUT(ifname), .arg = (void *)IFNAMSIZ, .cb = nlattr_get_chara }, 546 { .type = PF_RT_QNAME, .off = _OUT(qname), .arg = (void *)PF_QNAME_SIZE, .cb = nlattr_get_chara }, 547 { .type = PF_RT_PQNAME, .off = _OUT(pqname), .arg = (void *)PF_QNAME_SIZE, .cb = nlattr_get_chara }, 548 { .type = PF_RT_TAGNAME, .off = _OUT(tagname), .arg = (void *)PF_TAG_NAME_SIZE, .cb = nlattr_get_chara }, 549 { .type = PF_RT_MATCH_TAGNAME, .off = _OUT(match_tagname), .arg = (void *)PF_TAG_NAME_SIZE, .cb = nlattr_get_chara }, 550 { .type = PF_RT_OVERLOAD_TBLNAME, .off = _OUT(overload_tblname), .arg = (void *)PF_TABLE_NAME_SIZE, .cb = nlattr_get_chara }, 551 { .type = PF_RT_RPOOL, .off = _OUT(rpool), .arg = &pool_parser, .cb = nlattr_get_nested }, 552 { .type = PF_RT_OS_FINGERPRINT, .off = _OUT(os_fingerprint), .cb = nlattr_get_uint32 }, 553 { .type = PF_RT_RTABLEID, .off = _OUT(rtableid), .cb = nlattr_get_uint32 }, 554 { .type = PF_RT_TIMEOUT, .off = _OUT(timeout), .arg = &timeout_parser, .cb = nlattr_get_nested_timeouts }, 555 { .type = PF_RT_MAX_STATES, .off = _OUT(max_states), .cb = nlattr_get_uint32 }, 556 { .type = PF_RT_MAX_SRC_NODES, .off = _OUT(max_src_nodes), .cb = nlattr_get_uint32 }, 557 { .type = PF_RT_MAX_SRC_STATES, .off = _OUT(max_src_states), .cb = nlattr_get_uint32 }, 558 { .type = PF_RT_MAX_SRC_CONN_RATE_LIMIT, .off = _OUT(max_src_conn_rate.limit), .cb = nlattr_get_uint32 }, 559 { .type = PF_RT_MAX_SRC_CONN_RATE_SECS, .off = _OUT(max_src_conn_rate.seconds), .cb = nlattr_get_uint32 }, 560 { .type = PF_RT_DNPIPE, .off = _OUT(dnpipe), .cb = nlattr_get_uint16 }, 561 { .type = PF_RT_DNRPIPE, .off = _OUT(dnrpipe), .cb = nlattr_get_uint16 }, 562 { .type = PF_RT_DNFLAGS, .off = _OUT(free_flags), .cb = nlattr_get_uint32 }, 563 { .type = PF_RT_NR, .off = _OUT(nr), .cb = nlattr_get_uint32 }, 564 { .type = PF_RT_PROB, .off = _OUT(prob), .cb = nlattr_get_uint32 }, 565 { .type = PF_RT_CUID, .off = _OUT(cuid), .cb = nlattr_get_uint32 }, 566 {. type = PF_RT_CPID, .off = _OUT(cpid), .cb = nlattr_get_uint32 }, 567 { .type = PF_RT_RETURN_ICMP, .off = _OUT(return_icmp), .cb = nlattr_get_uint16 }, 568 { .type = PF_RT_RETURN_ICMP6, .off = _OUT(return_icmp6), .cb = nlattr_get_uint16 }, 569 { .type = PF_RT_MAX_MSS, .off = _OUT(max_mss), .cb = nlattr_get_uint16 }, 570 { .type = PF_RT_SCRUB_FLAGS, .off = _OUT(scrub_flags), .cb = nlattr_get_uint16 }, 571 { .type = PF_RT_UID, .off = _OUT(uid), .arg = &rule_uid_parser, .cb = nlattr_get_nested }, 572 { .type = PF_RT_GID, .off = _OUT(gid), .arg = &rule_uid_parser, .cb = nlattr_get_nested }, 573 { .type = PF_RT_RULE_FLAG, .off = _OUT(rule_flag), .cb = nlattr_get_uint32 }, 574 { .type = PF_RT_ACTION, .off = _OUT(action), .cb = nlattr_get_uint8 }, 575 { .type = PF_RT_DIRECTION, .off = _OUT(direction), .cb = nlattr_get_uint8 }, 576 { .type = PF_RT_LOG, .off = _OUT(log), .cb = nlattr_get_uint8 }, 577 { .type = PF_RT_LOGIF, .off = _OUT(logif), .cb = nlattr_get_uint8 }, 578 { .type = PF_RT_QUICK, .off = _OUT(quick), .cb = nlattr_get_uint8 }, 579 { .type = PF_RT_IF_NOT, .off = _OUT(ifnot), .cb = nlattr_get_uint8 }, 580 { .type = PF_RT_MATCH_TAG_NOT, .off = _OUT(match_tag_not), .cb = nlattr_get_uint8 }, 581 { .type = PF_RT_NATPASS, .off = _OUT(natpass), .cb = nlattr_get_uint8 }, 582 { .type = PF_RT_KEEP_STATE, .off = _OUT(keep_state), .cb = nlattr_get_uint8 }, 583 { .type = PF_RT_AF, .off = _OUT(af), .cb = nlattr_get_uint8 }, 584 { .type = PF_RT_PROTO, .off = _OUT(proto), .cb = nlattr_get_uint8 }, 585 { .type = PF_RT_TYPE, .off = _OUT(type), .cb = nlattr_get_uint8 }, 586 { .type = PF_RT_CODE, .off = _OUT(code), .cb = nlattr_get_uint8 }, 587 { .type = PF_RT_FLAGS, .off = _OUT(flags), .cb = nlattr_get_uint8 }, 588 { .type = PF_RT_FLAGSET, .off = _OUT(flagset), .cb = nlattr_get_uint8 }, 589 { .type = PF_RT_MIN_TTL, .off = _OUT(min_ttl), .cb = nlattr_get_uint8 }, 590 { .type = PF_RT_ALLOW_OPTS, .off = _OUT(allow_opts), .cb = nlattr_get_uint8 }, 591 { .type = PF_RT_RT, .off = _OUT(rt), .cb = nlattr_get_uint8 }, 592 { .type = PF_RT_RETURN_TTL, .off = _OUT(return_ttl), .cb = nlattr_get_uint8 }, 593 { .type = PF_RT_TOS, .off = _OUT(tos), .cb = nlattr_get_uint8 }, 594 { .type = PF_RT_SET_TOS, .off = _OUT(set_tos), .cb = nlattr_get_uint8 }, 595 { .type = PF_RT_ANCHOR_RELATIVE, .off = _OUT(anchor_relative), .cb = nlattr_get_uint8 }, 596 { .type = PF_RT_ANCHOR_WILDCARD, .off = _OUT(anchor_wildcard), .cb = nlattr_get_uint8 }, 597 { .type = PF_RT_FLUSH, .off = _OUT(flush), .cb = nlattr_get_uint8 }, 598 { .type = PF_RT_PRIO, .off = _OUT(prio), .cb = nlattr_get_uint8 }, 599 { .type = PF_RT_SET_PRIO, .off = _OUT(set_prio[0]), .cb = nlattr_get_uint8 }, 600 { .type = PF_RT_SET_PRIO_REPLY, .off = _OUT(set_prio[1]), .cb = nlattr_get_uint8 }, 601 { .type = PF_RT_DIVERT_ADDRESS, .off = _OUT(divert.addr), .cb = nlattr_get_in6_addr }, 602 { .type = PF_RT_DIVERT_PORT, .off = _OUT(divert.port), .cb = nlattr_get_uint16 }, 603 }; 604 NL_DECLARE_ATTR_PARSER(rule_parser, nla_p_rule); 605 #undef _OUT 606 struct nl_parsed_addrule { 607 struct pf_krule *rule; 608 uint32_t ticket; 609 uint32_t pool_ticket; 610 char *anchor; 611 char *anchor_call; 612 }; 613 #define _IN(_field) offsetof(struct genlmsghdr, _field) 614 #define _OUT(_field) offsetof(struct nl_parsed_addrule, _field) 615 static const struct nlattr_parser nla_p_addrule[] = { 616 { .type = PF_ART_TICKET, .off = _OUT(ticket), .cb = nlattr_get_uint32 }, 617 { .type = PF_ART_POOL_TICKET, .off = _OUT(pool_ticket), .cb = nlattr_get_uint32 }, 618 { .type = PF_ART_ANCHOR, .off = _OUT(anchor), .cb = nlattr_get_string }, 619 { .type = PF_ART_ANCHOR_CALL, .off = _OUT(anchor_call), .cb = nlattr_get_string }, 620 { .type = PF_ART_RULE, .off = _OUT(rule), .arg = &rule_parser, .cb = nlattr_get_nested_ptr } 621 }; 622 static const struct nlfield_parser nlf_p_addrule[] = { 623 }; 624 #undef _IN 625 #undef _OUT 626 NL_DECLARE_PARSER(addrule_parser, struct genlmsghdr, nlf_p_addrule, nla_p_addrule); 627 628 static int 629 pf_handle_addrule(struct nlmsghdr *hdr, struct nl_pstate *npt) 630 { 631 int error; 632 struct nl_parsed_addrule attrs = {}; 633 634 attrs.rule = pf_krule_alloc(); 635 636 error = nl_parse_nlmsg(hdr, &addrule_parser, npt, &attrs); 637 if (error != 0) { 638 pf_free_rule(attrs.rule); 639 return (error); 640 } 641 642 error = pf_ioctl_addrule(attrs.rule, attrs.ticket, attrs.pool_ticket, 643 attrs.anchor, attrs.anchor_call, nlp_get_cred(npt->nlp)->cr_uid, 644 hdr->nlmsg_pid); 645 646 return (error); 647 } 648 649 struct nl_parsed_getrules { 650 char *anchor; 651 uint8_t action; 652 }; 653 #define _IN(_field) offsetof(struct genlmsghdr, _field) 654 #define _OUT(_field) offsetof(struct pfioc_rule, _field) 655 static const struct nlattr_parser nla_p_getrules[] = { 656 { .type = PF_GR_ANCHOR, .off = _OUT(anchor), .arg = (void *)MAXPATHLEN, .cb = nlattr_get_chara }, 657 { .type = PF_GR_ACTION, .off = _OUT(rule.action), .cb = nlattr_get_uint8 }, 658 }; 659 static const struct nlfield_parser nlf_p_getrules[] = { 660 }; 661 NL_DECLARE_PARSER(getrules_parser, struct genlmsghdr, nlf_p_getrules, nla_p_getrules); 662 663 static int 664 pf_handle_getrules(struct nlmsghdr *hdr, struct nl_pstate *npt) 665 { 666 struct pfioc_rule attrs = {}; 667 int error; 668 struct nl_writer *nw = npt->nw; 669 struct genlmsghdr *ghdr_new; 670 671 error = nl_parse_nlmsg(hdr, &getrules_parser, npt, &attrs); 672 if (error != 0) 673 return (error); 674 675 if (!nlmsg_reply(nw, hdr, sizeof(struct genlmsghdr))) 676 return (ENOMEM); 677 678 ghdr_new = nlmsg_reserve_object(nw, struct genlmsghdr); 679 ghdr_new->cmd = PFNL_CMD_GETRULES; 680 ghdr_new->version = 0; 681 ghdr_new->reserved = 0; 682 683 error = pf_ioctl_getrules(&attrs); 684 if (error != 0) 685 goto out; 686 687 nlattr_add_u32(nw, PF_GR_NR, attrs.nr); 688 nlattr_add_u32(nw, PF_GR_TICKET, attrs.ticket); 689 690 if (!nlmsg_end(nw)) { 691 error = ENOMEM; 692 goto out; 693 } 694 695 return (0); 696 697 out: 698 nlmsg_abort(nw); 699 return (error); 700 } 701 702 static const struct nlhdr_parser *all_parsers[] = { 703 &state_parser, 704 &addrule_parser, 705 &getrules_parser 706 }; 707 708 static int family_id; 709 710 static const struct genl_cmd pf_cmds[] = { 711 { 712 .cmd_num = PFNL_CMD_GETSTATES, 713 .cmd_name = "GETSTATES", 714 .cmd_cb = pf_handle_getstates, 715 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP | GENL_CMD_CAP_HASPOL, 716 .cmd_priv = PRIV_NETINET_PF, 717 }, 718 { 719 .cmd_num = PFNL_CMD_GETCREATORS, 720 .cmd_name = "GETCREATORS", 721 .cmd_cb = pf_handle_getcreators, 722 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP | GENL_CMD_CAP_HASPOL, 723 .cmd_priv = PRIV_NETINET_PF, 724 }, 725 { 726 .cmd_num = PFNL_CMD_START, 727 .cmd_name = "START", 728 .cmd_cb = pf_handle_start, 729 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_HASPOL, 730 .cmd_priv = PRIV_NETINET_PF, 731 }, 732 { 733 .cmd_num = PFNL_CMD_STOP, 734 .cmd_name = "STOP", 735 .cmd_cb = pf_handle_stop, 736 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_HASPOL, 737 .cmd_priv = PRIV_NETINET_PF, 738 }, 739 { 740 .cmd_num = PFNL_CMD_ADDRULE, 741 .cmd_name = "ADDRULE", 742 .cmd_cb = pf_handle_addrule, 743 .cmd_flags = GENL_CMD_CAP_DO | GENL_CMD_CAP_DUMP | GENL_CMD_CAP_HASPOL, 744 .cmd_priv = PRIV_NETINET_PF, 745 }, 746 { 747 .cmd_num = PFNL_CMD_GETRULES, 748 .cmd_name = "GETRULES", 749 .cmd_cb = pf_handle_getrules, 750 .cmd_flags = GENL_CMD_CAP_DUMP | GENL_CMD_CAP_HASPOL, 751 .cmd_priv = PRIV_NETINET_PF, 752 }, 753 }; 754 755 void 756 pf_nl_register(void) 757 { 758 NL_VERIFY_PARSERS(all_parsers); 759 760 family_id = genl_register_family(PFNL_FAMILY_NAME, 0, 2, PFNL_CMD_MAX); 761 genl_register_cmds(PFNL_FAMILY_NAME, pf_cmds, NL_ARRAY_LEN(pf_cmds)); 762 } 763 764 void 765 pf_nl_unregister(void) 766 { 767 genl_unregister_family(PFNL_FAMILY_NAME); 768 } 769