1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2022 Alexander V. Chernikov <melifaro@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 #include "opt_inet.h" 31 #include "opt_inet6.h" 32 #include <sys/types.h> 33 #include <sys/eventhandler.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/socket.h> 37 #include <sys/sockio.h> 38 #include <sys/syslog.h> 39 40 #include <net/if.h> 41 #include <net/if_dl.h> 42 #include <net/if_media.h> 43 #include <net/if_var.h> 44 #include <net/if_clone.h> 45 #include <net/route.h> 46 #include <net/route/nhop.h> 47 #include <net/route/route_ctl.h> 48 #include <netlink/netlink.h> 49 #include <netlink/netlink_ctl.h> 50 #include <netlink/netlink_route.h> 51 #include <netlink/route/route_var.h> 52 53 #include <netinet6/scope6_var.h> /* scope deembedding */ 54 55 #define DEBUG_MOD_NAME nl_iface 56 #define DEBUG_MAX_LEVEL LOG_DEBUG3 57 #include <netlink/netlink_debug.h> 58 _DECLARE_DEBUG(LOG_DEBUG); 59 60 struct netlink_walkargs { 61 struct nl_writer *nw; 62 struct nlmsghdr hdr; 63 struct nlpcb *so; 64 uint32_t fibnum; 65 int family; 66 int error; 67 int count; 68 int dumped; 69 }; 70 71 static eventhandler_tag ifdetach_event, ifattach_event, ifaddr_event; 72 73 static SLIST_HEAD(, nl_cloner) nl_cloners = SLIST_HEAD_INITIALIZER(nl_cloners); 74 75 static struct sx rtnl_cloner_lock; 76 SX_SYSINIT(rtnl_cloner_lock, &rtnl_cloner_lock, "rtnl cloner lock"); 77 78 /* 79 * RTM_GETLINK request 80 * sendto(3, {{len=32, type=RTM_GETLINK, flags=NLM_F_REQUEST|NLM_F_DUMP, seq=1641940952, pid=0}, 81 * {ifi_family=AF_INET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}}, 32, 0, NULL, 0) = 32 82 * 83 * Reply: 84 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_ETHER, ifi_index=if_nametoindex("enp0s31f6"), ifi_flags=IFF_UP|IFF_BROADCAST|IFF_RUNNING|IFF_MULTICAST|IFF_LOWER_UP, ifi_change=0}, 85 {{nla_len=10, nla_type=IFLA_ADDRESS}, "\xfe\x54\x00\x52\x3e\x90"} 86 87 [ 88 {{nla_len=14, nla_type=IFLA_IFNAME}, "enp0s31f6"}, 89 {{nla_len=8, nla_type=IFLA_TXQLEN}, 1000}, 90 {{nla_len=5, nla_type=IFLA_OPERSTATE}, 6}, 91 {{nla_len=5, nla_type=IFLA_LINKMODE}, 0}, 92 {{nla_len=8, nla_type=IFLA_MTU}, 1500}, 93 {{nla_len=8, nla_type=IFLA_MIN_MTU}, 68}, 94 {{nla_len=8, nla_type=IFLA_MAX_MTU}, 9000}, 95 {{nla_len=8, nla_type=IFLA_GROUP}, 0}, 96 {{nla_len=8, nla_type=IFLA_PROMISCUITY}, 0}, 97 {{nla_len=8, nla_type=IFLA_NUM_TX_QUEUES}, 1}, 98 {{nla_len=8, nla_type=IFLA_GSO_MAX_SEGS}, 65535}, 99 {{nla_len=8, nla_type=IFLA_GSO_MAX_SIZE}, 65536}, 100 {{nla_len=8, nla_type=IFLA_NUM_RX_QUEUES}, 1}, 101 {{nla_len=5, nla_type=IFLA_CARRIER}, 1}, 102 {{nla_len=13, nla_type=IFLA_QDISC}, "fq_codel"}, 103 {{nla_len=8, nla_type=IFLA_CARRIER_CHANGES}, 2}, 104 {{nla_len=5, nla_type=IFLA_PROTO_DOWN}, 0}, 105 {{nla_len=8, nla_type=IFLA_CARRIER_UP_COUNT}, 1}, 106 {{nla_len=8, nla_type=IFLA_CARRIER_DOWN_COUNT}, 1}, 107 */ 108 109 struct if_state { 110 uint8_t ifla_operstate; 111 uint8_t ifla_carrier; 112 }; 113 114 static void 115 get_operstate_ether(struct ifnet *ifp, struct if_state *pstate) 116 { 117 struct ifmediareq ifmr = {}; 118 int error; 119 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (void *)&ifmr); 120 121 if (error != 0) { 122 NL_LOG(LOG_DEBUG, "error calling SIOCGIFMEDIA on %s: %d", 123 if_name(ifp), error); 124 return; 125 } 126 127 switch (IFM_TYPE(ifmr.ifm_active)) { 128 case IFM_ETHER: 129 if (ifmr.ifm_status & IFM_ACTIVE) { 130 pstate->ifla_carrier = 1; 131 if (ifp->if_flags & IFF_MONITOR) 132 pstate->ifla_operstate = IF_OPER_DORMANT; 133 else 134 pstate->ifla_operstate = IF_OPER_UP; 135 } else 136 pstate->ifla_operstate = IF_OPER_DOWN; 137 } 138 } 139 140 static bool 141 get_stats(struct nl_writer *nw, struct ifnet *ifp) 142 { 143 struct rtnl_link_stats64 *stats; 144 145 int nla_len = sizeof(struct nlattr) + sizeof(*stats); 146 struct nlattr *nla = nlmsg_reserve_data(nw, nla_len, struct nlattr); 147 if (nla == NULL) 148 return (false); 149 nla->nla_type = IFLA_STATS64; 150 nla->nla_len = nla_len; 151 stats = (struct rtnl_link_stats64 *)(nla + 1); 152 153 stats->rx_packets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 154 stats->tx_packets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 155 stats->rx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 156 stats->tx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 157 stats->rx_errors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 158 stats->tx_errors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 159 stats->rx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 160 stats->tx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 161 stats->multicast = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 162 stats->rx_nohandler = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 163 164 return (true); 165 } 166 167 static void 168 get_operstate(struct ifnet *ifp, struct if_state *pstate) 169 { 170 pstate->ifla_operstate = IF_OPER_UNKNOWN; 171 pstate->ifla_carrier = 0; /* no carrier */ 172 173 switch (ifp->if_type) { 174 case IFT_ETHER: 175 get_operstate_ether(ifp, pstate); 176 break; 177 case IFT_LOOP: 178 if (ifp->if_flags & IFF_UP) { 179 pstate->ifla_operstate = IF_OPER_UP; 180 pstate->ifla_carrier = 1; 181 } else 182 pstate->ifla_operstate = IF_OPER_DOWN; 183 break; 184 } 185 } 186 187 static unsigned 188 ifp_flags_to_netlink(const struct ifnet *ifp) 189 { 190 return (ifp->if_flags | ifp->if_drv_flags); 191 } 192 193 #define LLADDR_CONST(s) ((const void *)((s)->sdl_data + (s)->sdl_nlen)) 194 static bool 195 dump_sa(struct nl_writer *nw, int attr, const struct sockaddr *sa) 196 { 197 uint32_t addr_len = 0; 198 const void *addr_data = NULL; 199 #ifdef INET6 200 struct in6_addr addr6; 201 #endif 202 203 if (sa == NULL) 204 return (true); 205 206 switch (sa->sa_family) { 207 #ifdef INET 208 case AF_INET: 209 addr_len = sizeof(struct in_addr); 210 addr_data = &((const struct sockaddr_in *)sa)->sin_addr; 211 break; 212 #endif 213 #ifdef INET6 214 case AF_INET6: 215 in6_splitscope(&((const struct sockaddr_in6 *)sa)->sin6_addr, &addr6, &addr_len); 216 addr_len = sizeof(struct in6_addr); 217 addr_data = &addr6; 218 break; 219 #endif 220 case AF_LINK: 221 addr_len = ((const struct sockaddr_dl *)sa)->sdl_alen; 222 addr_data = LLADDR_CONST((const struct sockaddr_dl *)sa); 223 break; 224 default: 225 NL_LOG(LOG_DEBUG, "unsupported family: %d, skipping", sa->sa_family); 226 return (true); 227 } 228 229 return (nlattr_add(nw, attr, addr_len, addr_data)); 230 } 231 232 /* 233 * Dumps interface state, properties and metrics. 234 * @nw: message writer 235 * @ifp: target interface 236 * @hdr: template header 237 * 238 * This function is called without epoch and MAY sleep. 239 */ 240 static bool 241 dump_iface(struct nl_writer *nw, struct ifnet *ifp, const struct nlmsghdr *hdr) 242 { 243 struct ifinfomsg *ifinfo; 244 245 NL_LOG(LOG_DEBUG3, "dumping interface %s data", if_name(ifp)); 246 247 if (!nlmsg_reply(nw, hdr, sizeof(struct ifinfomsg))) 248 goto enomem; 249 250 ifinfo = nlmsg_reserve_object(nw, struct ifinfomsg); 251 ifinfo->ifi_family = AF_UNSPEC; 252 ifinfo->__ifi_pad = 0; 253 ifinfo->ifi_type = ifp->if_type; 254 ifinfo->ifi_index = ifp->if_index; 255 ifinfo->ifi_flags = ifp_flags_to_netlink(ifp); 256 ifinfo->ifi_change = 0; 257 258 nlattr_add_string(nw, IFLA_IFNAME, if_name(ifp)); 259 260 struct if_state ifs = {}; 261 get_operstate(ifp, &ifs); 262 263 nlattr_add_u8(nw, IFLA_OPERSTATE, ifs.ifla_operstate); 264 nlattr_add_u8(nw, IFLA_CARRIER, ifs.ifla_carrier); 265 266 /* 267 nlattr_add_u8(nw, IFLA_PROTO_DOWN, val); 268 nlattr_add_u8(nw, IFLA_LINKMODE, val); 269 */ 270 if ((ifp->if_addr != NULL)) { 271 dump_sa(nw, IFLA_ADDRESS, ifp->if_addr->ifa_addr); 272 } 273 274 if ((ifp->if_broadcastaddr != NULL)) { 275 nlattr_add(nw, IFLA_BROADCAST, ifp->if_addrlen, 276 ifp->if_broadcastaddr); 277 } 278 279 nlattr_add_u32(nw, IFLA_MTU, ifp->if_mtu); 280 /* 281 nlattr_add_u32(nw, IFLA_MIN_MTU, 60); 282 nlattr_add_u32(nw, IFLA_MAX_MTU, 9000); 283 nlattr_add_u32(nw, IFLA_GROUP, 0); 284 */ 285 get_stats(nw, ifp); 286 287 uint32_t val = (ifp->if_flags & IFF_PROMISC) != 0; 288 nlattr_add_u32(nw, IFLA_PROMISCUITY, val); 289 290 if (nlmsg_end(nw)) 291 return (true); 292 293 enomem: 294 NL_LOG(LOG_DEBUG, "unable to dump interface %s state (ENOMEM)", if_name(ifp)); 295 nlmsg_abort(nw); 296 return (false); 297 } 298 299 static bool 300 check_ifmsg(void *hdr, struct nl_pstate *npt) 301 { 302 struct ifinfomsg *ifm = hdr; 303 304 if (ifm->__ifi_pad != 0 || ifm->ifi_type != 0 || 305 ifm->ifi_flags != 0 || ifm->ifi_change != 0) { 306 nlmsg_report_err_msg(npt, 307 "strict checking: non-zero values in ifinfomsg header"); 308 return (false); 309 } 310 311 return (true); 312 } 313 314 #define _IN(_field) offsetof(struct ifinfomsg, _field) 315 #define _OUT(_field) offsetof(struct nl_parsed_link, _field) 316 static const struct nlfield_parser nlf_p_if[] = { 317 { .off_in = _IN(ifi_type), .off_out = _OUT(ifi_type), .cb = nlf_get_u16 }, 318 { .off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = nlf_get_u32 }, 319 }; 320 321 static const struct nlattr_parser nla_p_linfo[] = { 322 { .type = IFLA_INFO_KIND, .off = _OUT(ifla_cloner), .cb = nlattr_get_stringn }, 323 { .type = IFLA_INFO_DATA, .off = _OUT(ifla_idata), .cb = nlattr_get_nla }, 324 }; 325 NL_DECLARE_ATTR_PARSER(linfo_parser, nla_p_linfo); 326 327 static const struct nlattr_parser nla_p_if[] = { 328 { .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string }, 329 { .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = nlattr_get_uint32 }, 330 { .type = IFLA_LINK, .off = _OUT(ifi_index), .cb = nlattr_get_uint32 }, 331 { .type = IFLA_LINKINFO, .arg = &linfo_parser, .cb = nlattr_get_nested }, 332 { .type = IFLA_GROUP, .off = _OUT(ifla_group), .cb = nlattr_get_string }, 333 { .type = IFLA_ALT_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string }, 334 }; 335 #undef _IN 336 #undef _OUT 337 NL_DECLARE_STRICT_PARSER(ifmsg_parser, struct ifinfomsg, check_ifmsg, nlf_p_if, nla_p_if); 338 339 static bool 340 match_iface(struct nl_parsed_link *attrs, struct ifnet *ifp) 341 { 342 if (attrs->ifi_index != 0 && attrs->ifi_index != ifp->if_index) 343 return (false); 344 if (attrs->ifi_type != 0 && attrs->ifi_index != ifp->if_type) 345 return (false); 346 if (attrs->ifla_ifname != NULL && strcmp(attrs->ifla_ifname, if_name(ifp))) 347 return (false); 348 /* TODO: add group match */ 349 350 return (true); 351 } 352 353 /* 354 * {nlmsg_len=52, nlmsg_type=RTM_GETLINK, nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=1662842818, nlmsg_pid=0}, 355 * {ifi_family=AF_PACKET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}, 356 * [ 357 * [{nla_len=10, nla_type=IFLA_IFNAME}, "vnet9"], 358 * [{nla_len=8, nla_type=IFLA_EXT_MASK}, RTEXT_FILTER_VF] 359 * ] 360 */ 361 static int 362 rtnl_handle_getlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 363 { 364 struct epoch_tracker et; 365 struct ifnet *ifp; 366 int error = 0; 367 368 struct nl_parsed_link attrs = {}; 369 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 370 if (error != 0) 371 return (error); 372 373 struct netlink_walkargs wa = { 374 .so = nlp, 375 .nw = npt->nw, 376 .hdr.nlmsg_pid = hdr->nlmsg_pid, 377 .hdr.nlmsg_seq = hdr->nlmsg_seq, 378 .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI, 379 .hdr.nlmsg_type = NL_RTM_NEWLINK, 380 }; 381 382 /* Fast track for an interface w/ explicit index match */ 383 if (attrs.ifi_index != 0) { 384 NET_EPOCH_ENTER(et); 385 ifp = ifnet_byindex_ref(attrs.ifi_index); 386 NET_EPOCH_EXIT(et); 387 NLP_LOG(LOG_DEBUG3, nlp, "fast track -> searching index %u", attrs.ifi_index); 388 if (ifp != NULL) { 389 if (match_iface(&attrs, ifp)) { 390 if (!dump_iface(wa.nw, ifp, &wa.hdr)) 391 error = ENOMEM; 392 } else 393 error = ESRCH; 394 if_rele(ifp); 395 } else 396 error = ESRCH; 397 return (error); 398 } 399 400 /* 401 * Fetching some link properties require performing ioctl's that may be blocking. 402 * Address it by saving referenced pointers of the matching links, 403 * exiting from epoch and going through the list one-by-one. 404 */ 405 406 NL_LOG(LOG_DEBUG2, "Start dump"); 407 408 struct ifnet **match_array; 409 int offset = 0, base_count = 16; /* start with 128 bytes */ 410 match_array = malloc(base_count * sizeof(void *), M_TEMP, M_NOWAIT); 411 412 NLP_LOG(LOG_DEBUG3, nlp, "MATCHING: index=%u type=%d name=%s", 413 attrs.ifi_index, attrs.ifi_type, attrs.ifla_ifname); 414 NET_EPOCH_ENTER(et); 415 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 416 wa.count++; 417 if (match_iface(&attrs, ifp)) { 418 if (offset < base_count) { 419 if (!if_try_ref(ifp)) 420 continue; 421 match_array[offset++] = ifp; 422 continue; 423 } 424 /* Too many matches, need to reallocate */ 425 struct ifnet **new_array; 426 int sz = base_count * sizeof(void *); 427 base_count *= 2; 428 new_array = malloc(sz * 2, M_TEMP, M_NOWAIT); 429 if (new_array == NULL) { 430 error = ENOMEM; 431 break; 432 } 433 memcpy(new_array, match_array, sz); 434 free(match_array, M_TEMP); 435 match_array = new_array; 436 } 437 } 438 NET_EPOCH_EXIT(et); 439 440 NL_LOG(LOG_DEBUG2, "Matched %d interface(s), dumping", offset); 441 for (int i = 0; error == 0 && i < offset; i++) { 442 if (!dump_iface(wa.nw, match_array[i], &wa.hdr)) 443 error = ENOMEM; 444 } 445 for (int i = 0; i < offset; i++) 446 if_rele(match_array[i]); 447 free(match_array, M_TEMP); 448 449 NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped); 450 451 if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) { 452 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 453 return (ENOMEM); 454 } 455 456 return (error); 457 } 458 459 /* 460 * sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base=[ 461 * {nlmsg_len=60, nlmsg_type=RTM_NEWLINK, nlmsg_flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, nlmsg_seq=1662715618, nlmsg_pid=0}, 462 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}, 463 * {nla_len=11, nla_type=IFLA_IFNAME}, "dummy0"], 464 * [ 465 * {nla_len=16, nla_type=IFLA_LINKINFO}, 466 * [ 467 * {nla_len=9, nla_type=IFLA_INFO_KIND}, "dummy"... 468 * ] 469 * ] 470 */ 471 472 static int 473 rtnl_handle_dellink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 474 { 475 struct epoch_tracker et; 476 struct ifnet *ifp; 477 int error; 478 479 struct nl_parsed_link attrs = {}; 480 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 481 if (error != 0) 482 return (error); 483 484 NET_EPOCH_ENTER(et); 485 ifp = ifnet_byindex_ref(attrs.ifi_index); 486 NET_EPOCH_EXIT(et); 487 if (ifp == NULL) { 488 NLP_LOG(LOG_DEBUG, nlp, "unable to find interface %u", attrs.ifi_index); 489 return (ENOENT); 490 } 491 NLP_LOG(LOG_DEBUG3, nlp, "mapped ifindex %u to %s", attrs.ifi_index, if_name(ifp)); 492 493 sx_xlock(&ifnet_detach_sxlock); 494 error = if_clone_destroy(if_name(ifp)); 495 sx_xunlock(&ifnet_detach_sxlock); 496 497 NLP_LOG(LOG_DEBUG2, nlp, "deleting interface %s returned %d", if_name(ifp), error); 498 499 if_rele(ifp); 500 return (error); 501 } 502 503 static int 504 rtnl_handle_newlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 505 { 506 struct nl_cloner *cloner; 507 int error; 508 509 struct nl_parsed_link attrs = {}; 510 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 511 if (error != 0) 512 return (error); 513 514 if (attrs.ifla_ifname == NULL || strlen(attrs.ifla_ifname) == 0) { 515 /* Applications like ip(8) verify RTM_NEWLINK existance 516 * by calling it with empty arguments. Always return "innocent" 517 * error. 518 */ 519 NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_IFNAME attribute"); 520 return (EPERM); 521 } 522 523 if (attrs.ifla_cloner == NULL || strlen(attrs.ifla_cloner) == 0) { 524 NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_INFO_KIND attribute"); 525 return (EINVAL); 526 } 527 528 sx_slock(&rtnl_cloner_lock); 529 SLIST_FOREACH(cloner, &nl_cloners, next) { 530 if (!strcmp(attrs.ifla_cloner, cloner->name)) { 531 error = cloner->create_f(&attrs, nlp, npt); 532 sx_sunlock(&rtnl_cloner_lock); 533 return (error); 534 } 535 } 536 sx_sunlock(&rtnl_cloner_lock); 537 538 /* TODO: load cloner module if not exists & privilege permits */ 539 NLMSG_REPORT_ERR_MSG(npt, "interface type %s not supported", attrs.ifla_cloner); 540 return (ENOTSUP); 541 542 return (error); 543 } 544 545 /* 546 547 {ifa_family=AF_INET, ifa_prefixlen=8, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_HOST, ifa_index=if_nametoindex("lo")}, 548 [ 549 {{nla_len=8, nla_type=IFA_ADDRESS}, inet_addr("127.0.0.1")}, 550 {{nla_len=8, nla_type=IFA_LOCAL}, inet_addr("127.0.0.1")}, 551 {{nla_len=7, nla_type=IFA_LABEL}, "lo"}, 552 {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}, 553 {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=3619, tstamp=3619}}]}, 554 --- 555 556 {{len=72, type=RTM_NEWADDR, flags=NLM_F_MULTI, seq=1642191126, pid=566735}, 557 {ifa_family=AF_INET6, ifa_prefixlen=96, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_UNIVERSE, ifa_index=if_nametoindex("virbr0")}, 558 [ 559 {{nla_len=20, nla_type=IFA_ADDRESS}, inet_pton(AF_INET6, "2a01:4f8:13a:70c:ffff::1")}, 560 {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=4283, tstamp=4283}}, 561 {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}]}, 562 */ 563 564 static uint8_t 565 ifa_get_scope(const struct ifaddr *ifa) 566 { 567 const struct sockaddr *sa; 568 uint8_t addr_scope = RT_SCOPE_UNIVERSE; 569 570 sa = ifa->ifa_addr; 571 switch (sa->sa_family) { 572 #ifdef INET 573 case AF_INET: 574 { 575 struct in_addr addr; 576 addr = ((const struct sockaddr_in *)sa)->sin_addr; 577 if (IN_LOOPBACK(addr.s_addr)) 578 addr_scope = RT_SCOPE_HOST; 579 else if (IN_LINKLOCAL(addr.s_addr)) 580 addr_scope = RT_SCOPE_LINK; 581 break; 582 } 583 #endif 584 #ifdef INET6 585 case AF_INET6: 586 { 587 const struct in6_addr *addr; 588 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr; 589 if (IN6_IS_ADDR_LOOPBACK(addr)) 590 addr_scope = RT_SCOPE_HOST; 591 else if (IN6_IS_ADDR_LINKLOCAL(addr)) 592 addr_scope = RT_SCOPE_LINK; 593 break; 594 } 595 #endif 596 } 597 598 return (addr_scope); 599 } 600 601 static uint8_t 602 inet6_get_plen(const struct in6_addr *addr) 603 { 604 605 return (bitcount32(addr->s6_addr32[0]) + bitcount32(addr->s6_addr32[1]) + 606 bitcount32(addr->s6_addr32[2]) + bitcount32(addr->s6_addr32[3])); 607 } 608 609 static uint8_t 610 get_sa_plen(const struct sockaddr *sa) 611 { 612 #ifdef INET 613 const struct in_addr *paddr; 614 #endif 615 #ifdef INET6 616 const struct in6_addr *paddr6; 617 #endif 618 619 switch (sa->sa_family) { 620 #ifdef INET 621 case AF_INET: 622 if (sa == NULL) 623 return (32); 624 paddr = &(((const struct sockaddr_in *)sa)->sin_addr); 625 return bitcount32(paddr->s_addr);; 626 #endif 627 #ifdef INET6 628 case AF_INET6: 629 if (sa == NULL) 630 return (128); 631 paddr6 = &(((const struct sockaddr_in6 *)sa)->sin6_addr); 632 return inet6_get_plen(paddr6); 633 #endif 634 } 635 636 return (0); 637 } 638 639 640 /* 641 * {'attrs': [('IFA_ADDRESS', '12.0.0.1'), 642 ('IFA_LOCAL', '12.0.0.1'), 643 ('IFA_LABEL', 'eth10'), 644 ('IFA_FLAGS', 128), 645 ('IFA_CACHEINFO', {'ifa_preferred': 4294967295, 'ifa_valid': 4294967295, 'cstamp': 63745746, 'tstamp': 63745746})], 646 */ 647 static bool 648 dump_iface_addr(struct nl_writer *nw, struct ifnet *ifp, struct ifaddr *ifa, 649 const struct nlmsghdr *hdr) 650 { 651 struct ifaddrmsg *ifamsg; 652 struct sockaddr *sa = ifa->ifa_addr; 653 654 NL_LOG(LOG_DEBUG3, "dumping ifa %p type %s(%d) for interface %s", 655 ifa, rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp)); 656 657 if (!nlmsg_reply(nw, hdr, sizeof(struct ifaddrmsg))) 658 goto enomem; 659 660 ifamsg = nlmsg_reserve_object(nw, struct ifaddrmsg); 661 ifamsg->ifa_family = sa->sa_family; 662 ifamsg->ifa_prefixlen = get_sa_plen(ifa->ifa_netmask); 663 ifamsg->ifa_flags = 0; // ifa_flags is useless 664 ifamsg->ifa_scope = ifa_get_scope(ifa); 665 ifamsg->ifa_index = ifp->if_index; 666 667 struct sockaddr *dst_sa = ifa->ifa_dstaddr; 668 if ((dst_sa == NULL) || (dst_sa->sa_family != sa->sa_family)) 669 dst_sa = sa; 670 dump_sa(nw, IFA_ADDRESS, dst_sa); 671 dump_sa(nw, IFA_LOCAL, sa); 672 nlattr_add_string(nw, IFA_LABEL, if_name(ifp)); 673 674 uint32_t val = 0; // ifa->ifa_flags; 675 nlattr_add_u32(nw, IFA_FLAGS, val); 676 677 if (nlmsg_end(nw)) 678 return (true); 679 enomem: 680 NL_LOG(LOG_DEBUG, "Failed to dump ifa type %s(%d) for interface %s", 681 rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp)); 682 nlmsg_abort(nw); 683 return (false); 684 } 685 686 static int 687 rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 688 { 689 struct ifaddr *ifa; 690 struct ifnet *ifp; 691 int error = 0; 692 693 struct netlink_walkargs wa = { 694 .so = nlp, 695 .nw = npt->nw, 696 .hdr.nlmsg_pid = hdr->nlmsg_pid, 697 .hdr.nlmsg_seq = hdr->nlmsg_seq, 698 .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI, 699 .hdr.nlmsg_type = NL_RTM_NEWADDR, 700 }; 701 702 NL_LOG(LOG_DEBUG2, "Start dump"); 703 704 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 705 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 706 if (wa.family != 0 && wa.family != ifa->ifa_addr->sa_family) 707 continue; 708 if (ifa->ifa_addr->sa_family == AF_LINK) 709 continue; 710 wa.count++; 711 if (!dump_iface_addr(wa.nw, ifp, ifa, &wa.hdr)) { 712 error = ENOMEM; 713 break; 714 } 715 wa.dumped++; 716 } 717 if (error != 0) 718 break; 719 } 720 721 NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped); 722 723 if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) { 724 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 725 return (ENOMEM); 726 } 727 728 return (error); 729 } 730 731 static void 732 rtnl_handle_ifaddr(void *arg __unused, struct ifaddr *ifa, int cmd) 733 { 734 struct nlmsghdr hdr = {}; 735 struct nl_writer nw = {}; 736 uint32_t group = 0; 737 738 switch (ifa->ifa_addr->sa_family) { 739 #ifdef INET 740 case AF_INET: 741 group = RTNLGRP_IPV4_IFADDR; 742 break; 743 #endif 744 #ifdef INET6 745 case AF_INET6: 746 group = RTNLGRP_IPV6_IFADDR; 747 break; 748 #endif 749 default: 750 NL_LOG(LOG_DEBUG2, "ifa notification for unknown AF: %d", 751 ifa->ifa_addr->sa_family); 752 return; 753 } 754 755 if (!nl_has_listeners(NETLINK_ROUTE, group)) 756 return; 757 758 if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, group)) { 759 NL_LOG(LOG_DEBUG, "error allocating group writer"); 760 return; 761 } 762 763 hdr.nlmsg_type = (cmd == RTM_DELETE) ? NL_RTM_DELADDR : NL_RTM_NEWADDR; 764 765 dump_iface_addr(&nw, ifa->ifa_ifp, ifa, &hdr); 766 nlmsg_flush(&nw); 767 } 768 769 static void 770 rtnl_handle_ifattach(void *arg, struct ifnet *ifp) 771 { 772 struct nlmsghdr hdr = { .nlmsg_type = NL_RTM_NEWLINK }; 773 struct nl_writer nw = {}; 774 775 if (!nl_has_listeners(NETLINK_ROUTE, RTNLGRP_LINK)) 776 return; 777 778 if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, RTNLGRP_LINK)) { 779 NL_LOG(LOG_DEBUG, "error allocating mbuf"); 780 return; 781 } 782 dump_iface(&nw, ifp, &hdr); 783 nlmsg_flush(&nw); 784 } 785 786 static void 787 rtnl_handle_ifdetach(void *arg, struct ifnet *ifp) 788 { 789 struct nlmsghdr hdr = { .nlmsg_type = NL_RTM_DELLINK }; 790 struct nl_writer nw = {}; 791 792 if (!nl_has_listeners(NETLINK_ROUTE, RTNLGRP_LINK)) 793 return; 794 795 if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, RTNLGRP_LINK)) { 796 NL_LOG(LOG_DEBUG, "error allocating mbuf"); 797 return; 798 } 799 dump_iface(&nw, ifp, &hdr); 800 nlmsg_flush(&nw); 801 } 802 803 static const struct rtnl_cmd_handler cmd_handlers[] = { 804 { 805 .cmd = NL_RTM_GETLINK, 806 .name = "RTM_GETLINK", 807 .cb = &rtnl_handle_getlink, 808 .flags = RTNL_F_NOEPOCH, 809 }, 810 { 811 .cmd = NL_RTM_DELLINK, 812 .name = "RTM_DELLINK", 813 .cb = &rtnl_handle_dellink, 814 .priv = PRIV_NET_IFDESTROY, 815 .flags = RTNL_F_NOEPOCH, 816 }, 817 { 818 .cmd = NL_RTM_NEWLINK, 819 .name = "RTM_NEWLINK", 820 .cb = &rtnl_handle_newlink, 821 .priv = PRIV_NET_IFCREATE, 822 .flags = RTNL_F_NOEPOCH, 823 }, 824 { 825 .cmd = NL_RTM_GETADDR, 826 .name = "RTM_GETADDR", 827 .cb = &rtnl_handle_getaddr, 828 }, 829 { 830 .cmd = NL_RTM_NEWADDR, 831 .name = "RTM_NEWADDR", 832 .cb = &rtnl_handle_getaddr, 833 }, 834 { 835 .cmd = NL_RTM_DELADDR, 836 .name = "RTM_DELADDR", 837 .cb = &rtnl_handle_getaddr, 838 }, 839 }; 840 841 static const struct nlhdr_parser *all_parsers[] = { &ifmsg_parser }; 842 843 void 844 rtnl_iface_add_cloner(struct nl_cloner *cloner) 845 { 846 sx_xlock(&rtnl_cloner_lock); 847 SLIST_INSERT_HEAD(&nl_cloners, cloner, next); 848 sx_xunlock(&rtnl_cloner_lock); 849 } 850 851 void rtnl_iface_del_cloner(struct nl_cloner *cloner) 852 { 853 sx_xlock(&rtnl_cloner_lock); 854 SLIST_REMOVE(&nl_cloners, cloner, nl_cloner, next); 855 sx_xunlock(&rtnl_cloner_lock); 856 } 857 858 void 859 rtnl_ifaces_init(void) 860 { 861 ifattach_event = EVENTHANDLER_REGISTER( 862 ifnet_arrival_event, rtnl_handle_ifattach, NULL, 863 EVENTHANDLER_PRI_ANY); 864 ifdetach_event = EVENTHANDLER_REGISTER( 865 ifnet_departure_event, rtnl_handle_ifdetach, NULL, 866 EVENTHANDLER_PRI_ANY); 867 ifaddr_event = EVENTHANDLER_REGISTER( 868 rt_addrmsg, rtnl_handle_ifaddr, NULL, 869 EVENTHANDLER_PRI_ANY); 870 NL_VERIFY_PARSERS(all_parsers); 871 rtnl_iface_drivers_register(); 872 rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers)); 873 } 874 875 void 876 rtnl_ifaces_destroy(void) 877 { 878 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ifattach_event); 879 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_event); 880 EVENTHANDLER_DEREGISTER(rt_addrmsg, ifaddr_event); 881 } 882