1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 "opt_netlink.h" 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 #include <sys/types.h> 35 #include <sys/eventhandler.h> 36 #include <sys/kernel.h> 37 #include <sys/jail.h> 38 #include <sys/malloc.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/syslog.h> 42 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/if_media.h> 46 #include <net/if_var.h> 47 #include <net/if_clone.h> 48 #include <net/route.h> 49 #include <net/route/nhop.h> 50 #include <net/route/route_ctl.h> 51 #include <netinet/in_var.h> 52 #include <netinet6/in6_var.h> 53 #include <netinet6/scope6_var.h> /* scope deembedding */ 54 #include <netlink/netlink.h> 55 #include <netlink/netlink_ctl.h> 56 #include <netlink/netlink_route.h> 57 #include <netlink/route/route_var.h> 58 59 #define DEBUG_MOD_NAME nl_iface 60 #define DEBUG_MAX_LEVEL LOG_DEBUG3 61 #include <netlink/netlink_debug.h> 62 _DECLARE_DEBUG(LOG_INFO); 63 64 struct netlink_walkargs { 65 struct nl_writer *nw; 66 struct nlmsghdr hdr; 67 struct nlpcb *so; 68 struct ucred *cred; 69 uint32_t fibnum; 70 int family; 71 int error; 72 int count; 73 int dumped; 74 }; 75 76 static eventhandler_tag ifdetach_event, ifattach_event, iflink_event, ifaddr_event; 77 78 static SLIST_HEAD(, nl_cloner) nl_cloners = SLIST_HEAD_INITIALIZER(nl_cloners); 79 80 static struct sx rtnl_cloner_lock; 81 SX_SYSINIT(rtnl_cloner_lock, &rtnl_cloner_lock, "rtnl cloner lock"); 82 83 /* These are external hooks for CARP. */ 84 extern int (*carp_get_vhid_p)(struct ifaddr *); 85 86 /* 87 * RTM_GETLINK request 88 * sendto(3, {{len=32, type=RTM_GETLINK, flags=NLM_F_REQUEST|NLM_F_DUMP, seq=1641940952, pid=0}, 89 * {ifi_family=AF_INET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}}, 32, 0, NULL, 0) = 32 90 * 91 * Reply: 92 * {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}, 93 {{nla_len=10, nla_type=IFLA_ADDRESS}, "\xfe\x54\x00\x52\x3e\x90"} 94 95 [ 96 {{nla_len=14, nla_type=IFLA_IFNAME}, "enp0s31f6"}, 97 {{nla_len=8, nla_type=IFLA_TXQLEN}, 1000}, 98 {{nla_len=5, nla_type=IFLA_OPERSTATE}, 6}, 99 {{nla_len=5, nla_type=IFLA_LINKMODE}, 0}, 100 {{nla_len=8, nla_type=IFLA_MTU}, 1500}, 101 {{nla_len=8, nla_type=IFLA_MIN_MTU}, 68}, 102 {{nla_len=8, nla_type=IFLA_MAX_MTU}, 9000}, 103 {{nla_len=8, nla_type=IFLA_GROUP}, 0}, 104 {{nla_len=8, nla_type=IFLA_PROMISCUITY}, 0}, 105 {{nla_len=8, nla_type=IFLA_NUM_TX_QUEUES}, 1}, 106 {{nla_len=8, nla_type=IFLA_GSO_MAX_SEGS}, 65535}, 107 {{nla_len=8, nla_type=IFLA_GSO_MAX_SIZE}, 65536}, 108 {{nla_len=8, nla_type=IFLA_NUM_RX_QUEUES}, 1}, 109 {{nla_len=5, nla_type=IFLA_CARRIER}, 1}, 110 {{nla_len=13, nla_type=IFLA_QDISC}, "fq_codel"}, 111 {{nla_len=8, nla_type=IFLA_CARRIER_CHANGES}, 2}, 112 {{nla_len=5, nla_type=IFLA_PROTO_DOWN}, 0}, 113 {{nla_len=8, nla_type=IFLA_CARRIER_UP_COUNT}, 1}, 114 {{nla_len=8, nla_type=IFLA_CARRIER_DOWN_COUNT}, 1}, 115 */ 116 117 struct if_state { 118 uint8_t ifla_operstate; 119 uint8_t ifla_carrier; 120 }; 121 122 static void 123 get_operstate_ether(struct ifnet *ifp, struct if_state *pstate) 124 { 125 struct ifmediareq ifmr = {}; 126 int error; 127 error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (void *)&ifmr); 128 129 if (error != 0) { 130 NL_LOG(LOG_DEBUG, "error calling SIOCGIFMEDIA on %s: %d", 131 if_name(ifp), error); 132 return; 133 } 134 135 switch (IFM_TYPE(ifmr.ifm_active)) { 136 case IFM_ETHER: 137 if (ifmr.ifm_status & IFM_ACTIVE) { 138 pstate->ifla_carrier = 1; 139 if (ifp->if_flags & IFF_MONITOR) 140 pstate->ifla_operstate = IF_OPER_DORMANT; 141 else 142 pstate->ifla_operstate = IF_OPER_UP; 143 } else 144 pstate->ifla_operstate = IF_OPER_DOWN; 145 } 146 } 147 148 static bool 149 get_stats(struct nl_writer *nw, struct ifnet *ifp) 150 { 151 struct rtnl_link_stats64 *stats; 152 153 int nla_len = sizeof(struct nlattr) + sizeof(*stats); 154 struct nlattr *nla = nlmsg_reserve_data(nw, nla_len, struct nlattr); 155 if (nla == NULL) 156 return (false); 157 nla->nla_type = IFLA_STATS64; 158 nla->nla_len = nla_len; 159 stats = (struct rtnl_link_stats64 *)(nla + 1); 160 161 stats->rx_packets = ifp->if_get_counter(ifp, IFCOUNTER_IPACKETS); 162 stats->tx_packets = ifp->if_get_counter(ifp, IFCOUNTER_OPACKETS); 163 stats->rx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_IBYTES); 164 stats->tx_bytes = ifp->if_get_counter(ifp, IFCOUNTER_OBYTES); 165 stats->rx_errors = ifp->if_get_counter(ifp, IFCOUNTER_IERRORS); 166 stats->tx_errors = ifp->if_get_counter(ifp, IFCOUNTER_OERRORS); 167 stats->rx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_IQDROPS); 168 stats->tx_dropped = ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS); 169 stats->multicast = ifp->if_get_counter(ifp, IFCOUNTER_IMCASTS); 170 stats->rx_nohandler = ifp->if_get_counter(ifp, IFCOUNTER_NOPROTO); 171 172 return (true); 173 } 174 175 static void 176 get_operstate(struct ifnet *ifp, struct if_state *pstate) 177 { 178 pstate->ifla_operstate = IF_OPER_UNKNOWN; 179 pstate->ifla_carrier = 0; /* no carrier */ 180 181 switch (ifp->if_type) { 182 case IFT_ETHER: 183 case IFT_L2VLAN: 184 get_operstate_ether(ifp, pstate); 185 break; 186 default: 187 /* Map admin state to the operstate */ 188 if (ifp->if_flags & IFF_UP) { 189 pstate->ifla_operstate = IF_OPER_UP; 190 pstate->ifla_carrier = 1; 191 } else 192 pstate->ifla_operstate = IF_OPER_DOWN; 193 break; 194 } 195 } 196 197 static void 198 get_hwaddr(struct nl_writer *nw, struct ifnet *ifp) 199 { 200 struct ifreq ifr = {}; 201 202 if (if_gethwaddr(ifp, &ifr) == 0) { 203 nlattr_add(nw, IFLAF_ORIG_HWADDR, if_getaddrlen(ifp), 204 ifr.ifr_addr.sa_data); 205 } 206 } 207 208 static unsigned 209 ifp_flags_to_netlink(const struct ifnet *ifp) 210 { 211 return (ifp->if_flags | ifp->if_drv_flags); 212 } 213 214 #define LLADDR_CONST(s) ((const void *)((s)->sdl_data + (s)->sdl_nlen)) 215 static bool 216 dump_sa(struct nl_writer *nw, int attr, const struct sockaddr *sa) 217 { 218 uint32_t addr_len = 0; 219 const void *addr_data = NULL; 220 #ifdef INET6 221 struct in6_addr addr6; 222 #endif 223 224 if (sa == NULL) 225 return (true); 226 227 switch (sa->sa_family) { 228 #ifdef INET 229 case AF_INET: 230 addr_len = sizeof(struct in_addr); 231 addr_data = &((const struct sockaddr_in *)sa)->sin_addr; 232 break; 233 #endif 234 #ifdef INET6 235 case AF_INET6: 236 in6_splitscope(&((const struct sockaddr_in6 *)sa)->sin6_addr, &addr6, &addr_len); 237 addr_len = sizeof(struct in6_addr); 238 addr_data = &addr6; 239 break; 240 #endif 241 case AF_LINK: 242 addr_len = ((const struct sockaddr_dl *)sa)->sdl_alen; 243 addr_data = LLADDR_CONST((const struct sockaddr_dl *)sa); 244 break; 245 case AF_UNSPEC: 246 /* Ignore empty SAs without warning */ 247 return (true); 248 default: 249 NL_LOG(LOG_DEBUG2, "unsupported family: %d, skipping", sa->sa_family); 250 return (true); 251 } 252 253 return (nlattr_add(nw, attr, addr_len, addr_data)); 254 } 255 256 /* 257 * Dumps interface state, properties and metrics. 258 * @nw: message writer 259 * @ifp: target interface 260 * @hdr: template header 261 * @if_flags_mask: changed if_[drv]_flags bitmask 262 * 263 * This function is called without epoch and MAY sleep. 264 */ 265 static bool 266 dump_iface(struct nl_writer *nw, struct ifnet *ifp, const struct nlmsghdr *hdr, 267 int if_flags_mask) 268 { 269 struct ifinfomsg *ifinfo; 270 271 NL_LOG(LOG_DEBUG3, "dumping interface %s data", if_name(ifp)); 272 273 if (!nlmsg_reply(nw, hdr, sizeof(struct ifinfomsg))) 274 goto enomem; 275 276 ifinfo = nlmsg_reserve_object(nw, struct ifinfomsg); 277 ifinfo->ifi_family = AF_UNSPEC; 278 ifinfo->__ifi_pad = 0; 279 ifinfo->ifi_type = ifp->if_type; 280 ifinfo->ifi_index = ifp->if_index; 281 ifinfo->ifi_flags = ifp_flags_to_netlink(ifp); 282 ifinfo->ifi_change = if_flags_mask; 283 284 struct if_state ifs = {}; 285 get_operstate(ifp, &ifs); 286 287 if (ifs.ifla_operstate == IF_OPER_UP) 288 ifinfo->ifi_flags |= IFF_LOWER_UP; 289 290 nlattr_add_string(nw, IFLA_IFNAME, if_name(ifp)); 291 nlattr_add_u8(nw, IFLA_OPERSTATE, ifs.ifla_operstate); 292 nlattr_add_u8(nw, IFLA_CARRIER, ifs.ifla_carrier); 293 294 /* 295 nlattr_add_u8(nw, IFLA_PROTO_DOWN, val); 296 nlattr_add_u8(nw, IFLA_LINKMODE, val); 297 */ 298 if (if_getaddrlen(ifp) != 0) { 299 struct ifaddr *ifa = if_getifaddr(ifp); 300 301 dump_sa(nw, IFLA_ADDRESS, ifa->ifa_addr); 302 } 303 304 if ((ifp->if_broadcastaddr != NULL)) { 305 nlattr_add(nw, IFLA_BROADCAST, ifp->if_addrlen, 306 ifp->if_broadcastaddr); 307 } 308 309 nlattr_add_u32(nw, IFLA_MTU, ifp->if_mtu); 310 /* 311 nlattr_add_u32(nw, IFLA_MIN_MTU, 60); 312 nlattr_add_u32(nw, IFLA_MAX_MTU, 9000); 313 nlattr_add_u32(nw, IFLA_GROUP, 0); 314 */ 315 316 if (ifp->if_description != NULL) 317 nlattr_add_string(nw, IFLA_IFALIAS, ifp->if_description); 318 319 /* Store FreeBSD-specific attributes */ 320 int off = nlattr_add_nested(nw, IFLA_FREEBSD); 321 if (off != 0) { 322 get_hwaddr(nw, ifp); 323 324 nlattr_set_len(nw, off); 325 } 326 327 get_stats(nw, ifp); 328 329 uint32_t val = (ifp->if_flags & IFF_PROMISC) != 0; 330 nlattr_add_u32(nw, IFLA_PROMISCUITY, val); 331 332 ifc_dump_ifp_nl(ifp, nw); 333 334 if (nlmsg_end(nw)) 335 return (true); 336 337 enomem: 338 NL_LOG(LOG_DEBUG, "unable to dump interface %s state (ENOMEM)", if_name(ifp)); 339 nlmsg_abort(nw); 340 return (false); 341 } 342 343 static bool 344 check_ifmsg(void *hdr, struct nl_pstate *npt) 345 { 346 struct ifinfomsg *ifm = hdr; 347 348 if (ifm->__ifi_pad != 0 || ifm->ifi_type != 0 || 349 ifm->ifi_flags != 0 || ifm->ifi_change != 0) { 350 nlmsg_report_err_msg(npt, 351 "strict checking: non-zero values in ifinfomsg header"); 352 return (false); 353 } 354 355 return (true); 356 } 357 358 #define _IN(_field) offsetof(struct ifinfomsg, _field) 359 #define _OUT(_field) offsetof(struct nl_parsed_link, _field) 360 static const struct nlfield_parser nlf_p_if[] = { 361 { .off_in = _IN(ifi_type), .off_out = _OUT(ifi_type), .cb = nlf_get_u16 }, 362 { .off_in = _IN(ifi_index), .off_out = _OUT(ifi_index), .cb = nlf_get_u32 }, 363 { .off_in = _IN(ifi_flags), .off_out = _OUT(ifi_flags), .cb = nlf_get_u32 }, 364 { .off_in = _IN(ifi_change), .off_out = _OUT(ifi_change), .cb = nlf_get_u32 }, 365 }; 366 367 static const struct nlattr_parser nla_p_linfo[] = { 368 { .type = IFLA_INFO_KIND, .off = _OUT(ifla_cloner), .cb = nlattr_get_stringn }, 369 { .type = IFLA_INFO_DATA, .off = _OUT(ifla_idata), .cb = nlattr_get_nla }, 370 }; 371 NL_DECLARE_ATTR_PARSER(linfo_parser, nla_p_linfo); 372 373 static const struct nlattr_parser nla_p_if[] = { 374 { .type = IFLA_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string }, 375 { .type = IFLA_MTU, .off = _OUT(ifla_mtu), .cb = nlattr_get_uint32 }, 376 { .type = IFLA_LINK, .off = _OUT(ifla_link), .cb = nlattr_get_uint32 }, 377 { .type = IFLA_LINKINFO, .arg = &linfo_parser, .cb = nlattr_get_nested }, 378 { .type = IFLA_IFALIAS, .off = _OUT(ifla_ifalias), .cb = nlattr_get_string }, 379 { .type = IFLA_GROUP, .off = _OUT(ifla_group), .cb = nlattr_get_string }, 380 { .type = IFLA_ALT_IFNAME, .off = _OUT(ifla_ifname), .cb = nlattr_get_string }, 381 }; 382 #undef _IN 383 #undef _OUT 384 NL_DECLARE_STRICT_PARSER(ifmsg_parser, struct ifinfomsg, check_ifmsg, nlf_p_if, nla_p_if); 385 386 static bool 387 match_iface(struct ifnet *ifp, void *_arg) 388 { 389 struct nl_parsed_link *attrs = (struct nl_parsed_link *)_arg; 390 391 if (attrs->ifi_index != 0 && attrs->ifi_index != ifp->if_index) 392 return (false); 393 if (attrs->ifi_type != 0 && attrs->ifi_index != ifp->if_type) 394 return (false); 395 if (attrs->ifla_ifname != NULL && strcmp(attrs->ifla_ifname, if_name(ifp))) 396 return (false); 397 /* TODO: add group match */ 398 399 return (true); 400 } 401 402 static int 403 dump_cb(struct ifnet *ifp, void *_arg) 404 { 405 struct netlink_walkargs *wa = (struct netlink_walkargs *)_arg; 406 if (!dump_iface(wa->nw, ifp, &wa->hdr, 0)) 407 return (ENOMEM); 408 return (0); 409 } 410 411 /* 412 * {nlmsg_len=52, nlmsg_type=RTM_GETLINK, nlmsg_flags=NLM_F_REQUEST, nlmsg_seq=1662842818, nlmsg_pid=0}, 413 * {ifi_family=AF_PACKET, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}, 414 * [ 415 * [{nla_len=10, nla_type=IFLA_IFNAME}, "vnet9"], 416 * [{nla_len=8, nla_type=IFLA_EXT_MASK}, RTEXT_FILTER_VF] 417 * ] 418 */ 419 static int 420 rtnl_handle_getlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 421 { 422 struct epoch_tracker et; 423 struct ifnet *ifp; 424 int error = 0; 425 426 struct nl_parsed_link attrs = {}; 427 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 428 if (error != 0) 429 return (error); 430 431 struct netlink_walkargs wa = { 432 .so = nlp, 433 .nw = npt->nw, 434 .hdr.nlmsg_pid = hdr->nlmsg_pid, 435 .hdr.nlmsg_seq = hdr->nlmsg_seq, 436 .hdr.nlmsg_flags = hdr->nlmsg_flags, 437 .hdr.nlmsg_type = NL_RTM_NEWLINK, 438 }; 439 440 /* Fast track for an interface w/ explicit name or index match */ 441 if ((attrs.ifi_index != 0) || (attrs.ifla_ifname != NULL)) { 442 if (attrs.ifi_index != 0) { 443 NLP_LOG(LOG_DEBUG3, nlp, "fast track -> searching index %u", 444 attrs.ifi_index); 445 NET_EPOCH_ENTER(et); 446 ifp = ifnet_byindex_ref(attrs.ifi_index); 447 NET_EPOCH_EXIT(et); 448 } else { 449 NLP_LOG(LOG_DEBUG3, nlp, "fast track -> searching name %s", 450 attrs.ifla_ifname); 451 ifp = ifunit_ref(attrs.ifla_ifname); 452 } 453 454 if (ifp != NULL) { 455 if (match_iface(ifp, &attrs)) { 456 if (!dump_iface(wa.nw, ifp, &wa.hdr, 0)) 457 error = ENOMEM; 458 } else 459 error = ENODEV; 460 if_rele(ifp); 461 } else 462 error = ENODEV; 463 return (error); 464 } 465 466 /* Always treat non-direct-match as a multipart message */ 467 wa.hdr.nlmsg_flags |= NLM_F_MULTI; 468 469 /* 470 * Fetching some link properties require performing ioctl's that may be blocking. 471 * Address it by saving referenced pointers of the matching links, 472 * exiting from epoch and going through the list one-by-one. 473 */ 474 475 NL_LOG(LOG_DEBUG2, "Start dump"); 476 if_foreach_sleep(match_iface, &attrs, dump_cb, &wa); 477 NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped); 478 479 if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) { 480 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 481 return (ENOMEM); 482 } 483 484 return (error); 485 } 486 487 /* 488 * sendmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base=[ 489 * {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}, 490 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0}, 491 * {nla_len=11, nla_type=IFLA_IFNAME}, "dummy0"], 492 * [ 493 * {nla_len=16, nla_type=IFLA_LINKINFO}, 494 * [ 495 * {nla_len=9, nla_type=IFLA_INFO_KIND}, "dummy"... 496 * ] 497 * ] 498 */ 499 500 static int 501 rtnl_handle_dellink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 502 { 503 struct epoch_tracker et; 504 struct ifnet *ifp; 505 int error; 506 507 struct nl_parsed_link attrs = {}; 508 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 509 if (error != 0) 510 return (error); 511 512 NET_EPOCH_ENTER(et); 513 ifp = ifnet_byindex_ref(attrs.ifi_index); 514 NET_EPOCH_EXIT(et); 515 if (ifp == NULL) { 516 NLP_LOG(LOG_DEBUG, nlp, "unable to find interface %u", attrs.ifi_index); 517 return (ENOENT); 518 } 519 NLP_LOG(LOG_DEBUG3, nlp, "mapped ifindex %u to %s", attrs.ifi_index, if_name(ifp)); 520 521 sx_xlock(&ifnet_detach_sxlock); 522 error = if_clone_destroy(if_name(ifp)); 523 sx_xunlock(&ifnet_detach_sxlock); 524 525 NLP_LOG(LOG_DEBUG2, nlp, "deleting interface %s returned %d", if_name(ifp), error); 526 527 if_rele(ifp); 528 return (error); 529 } 530 531 /* 532 * New link: 533 * type=RTM_NEWLINK, flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, seq=1668185590, pid=0}, 534 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0} 535 * [ 536 * {{nla_len=8, nla_type=IFLA_MTU}, 123}, 537 * {{nla_len=10, nla_type=IFLA_IFNAME}, "vlan1"}, 538 * {{nla_len=24, nla_type=IFLA_LINKINFO}, 539 * [ 540 * {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...}, 541 * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x7b\x00\x00\x00"}]}]} 542 * 543 * Update link: 544 * type=RTM_NEWLINK, flags=NLM_F_REQUEST|NLM_F_ACK, seq=1668185923, pid=0}, 545 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=if_nametoindex("lo"), ifi_flags=0, ifi_change=0}, 546 * {{nla_len=8, nla_type=IFLA_MTU}, 123}} 547 * 548 * 549 * Check command availability: 550 * type=RTM_NEWLINK, flags=NLM_F_REQUEST|NLM_F_ACK, seq=0, pid=0}, 551 * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0} 552 */ 553 554 555 static int 556 create_link(struct nlmsghdr *hdr, struct nl_parsed_link *lattrs, 557 struct nlattr_bmask *bm, struct nlpcb *nlp, struct nl_pstate *npt) 558 { 559 if (lattrs->ifla_ifname == NULL || strlen(lattrs->ifla_ifname) == 0) { 560 NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_IFNAME attribute"); 561 return (EINVAL); 562 } 563 if (lattrs->ifla_cloner == NULL || strlen(lattrs->ifla_cloner) == 0) { 564 NLMSG_REPORT_ERR_MSG(npt, "empty IFLA_INFO_KIND attribute"); 565 return (EINVAL); 566 } 567 568 struct ifc_data_nl ifd = { 569 .flags = IFC_F_CREATE, 570 .lattrs = lattrs, 571 .bm = bm, 572 .npt = npt, 573 }; 574 if (ifc_create_ifp_nl(lattrs->ifla_ifname, &ifd) && ifd.error == 0) 575 nl_store_ifp_cookie(npt, ifd.ifp); 576 577 return (ifd.error); 578 } 579 580 static int 581 modify_link(struct nlmsghdr *hdr, struct nl_parsed_link *lattrs, 582 struct nlattr_bmask *bm, struct nlpcb *nlp, struct nl_pstate *npt) 583 { 584 struct ifnet *ifp = NULL; 585 struct epoch_tracker et; 586 587 if (lattrs->ifi_index == 0 && lattrs->ifla_ifname == NULL) { 588 /* 589 * Applications like ip(8) verify RTM_NEWLINK command 590 * existence by calling it with empty arguments. Always 591 * return "innocent" error in that case. 592 */ 593 NLMSG_REPORT_ERR_MSG(npt, "empty ifi_index field"); 594 return (EPERM); 595 } 596 597 if (lattrs->ifi_index != 0) { 598 NET_EPOCH_ENTER(et); 599 ifp = ifnet_byindex_ref(lattrs->ifi_index); 600 NET_EPOCH_EXIT(et); 601 if (ifp == NULL) { 602 NLMSG_REPORT_ERR_MSG(npt, "unable to find interface #%u", 603 lattrs->ifi_index); 604 return (ENOENT); 605 } 606 } 607 608 if (ifp == NULL && lattrs->ifla_ifname != NULL) { 609 ifp = ifunit_ref(lattrs->ifla_ifname); 610 if (ifp == NULL) { 611 NLMSG_REPORT_ERR_MSG(npt, "unable to find interface %s", 612 lattrs->ifla_ifname); 613 return (ENOENT); 614 } 615 } 616 617 MPASS(ifp != NULL); 618 619 /* 620 * Modification request can address either 621 * 1) cloned interface, in which case we call the cloner-specific 622 * modification routine 623 * or 624 * 2) non-cloned (e.g. "physical") interface, in which case we call 625 * generic modification routine 626 */ 627 struct ifc_data_nl ifd = { .lattrs = lattrs, .bm = bm, .npt = npt }; 628 if (!ifc_modify_ifp_nl(ifp, &ifd)) 629 ifd.error = nl_modify_ifp_generic(ifp, lattrs, bm, npt); 630 631 if_rele(ifp); 632 633 return (ifd.error); 634 } 635 636 637 static int 638 rtnl_handle_newlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 639 { 640 struct nlattr_bmask bm; 641 int error; 642 643 struct nl_parsed_link attrs = {}; 644 error = nl_parse_nlmsg(hdr, &ifmsg_parser, npt, &attrs); 645 if (error != 0) 646 return (error); 647 nl_get_attrs_bmask_nlmsg(hdr, &ifmsg_parser, &bm); 648 649 if (hdr->nlmsg_flags & NLM_F_CREATE) 650 return (create_link(hdr, &attrs, &bm, nlp, npt)); 651 else 652 return (modify_link(hdr, &attrs, &bm, nlp, npt)); 653 } 654 655 static void 656 set_scope6(struct sockaddr *sa, uint32_t ifindex) 657 { 658 #ifdef INET6 659 if (sa != NULL && sa->sa_family == AF_INET6) { 660 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa; 661 662 if (IN6_IS_ADDR_LINKLOCAL(&sa6->sin6_addr)) 663 in6_set_unicast_scopeid(&sa6->sin6_addr, ifindex); 664 } 665 #endif 666 } 667 668 static bool 669 check_sa_family(const struct sockaddr *sa, int family, const char *attr_name, 670 struct nl_pstate *npt) 671 { 672 if (sa == NULL || sa->sa_family == family) 673 return (true); 674 675 nlmsg_report_err_msg(npt, "wrong family for %s attribute: %d != %d", 676 attr_name, family, sa->sa_family); 677 return (false); 678 } 679 680 struct nl_parsed_ifa { 681 uint8_t ifa_family; 682 uint8_t ifa_prefixlen; 683 uint8_t ifa_scope; 684 uint32_t ifa_index; 685 uint32_t ifa_flags; 686 uint32_t ifaf_vhid; 687 uint32_t ifaf_flags; 688 struct sockaddr *ifa_address; 689 struct sockaddr *ifa_local; 690 struct sockaddr *ifa_broadcast; 691 struct ifa_cacheinfo *ifa_cacheinfo; 692 struct sockaddr *f_ifa_addr; 693 struct sockaddr *f_ifa_dst; 694 }; 695 696 static int 697 nlattr_get_cinfo(struct nlattr *nla, struct nl_pstate *npt, 698 const void *arg __unused, void *target) 699 { 700 if (__predict_false(NLA_DATA_LEN(nla) != sizeof(struct ifa_cacheinfo))) { 701 NLMSG_REPORT_ERR_MSG(npt, "nla type %d size(%u) is not ifa_cacheinfo", 702 nla->nla_type, NLA_DATA_LEN(nla)); 703 return (EINVAL); 704 } 705 *((struct ifa_cacheinfo **)target) = (struct ifa_cacheinfo *)NL_RTA_DATA(nla); 706 return (0); 707 } 708 709 #define _IN(_field) offsetof(struct ifaddrmsg, _field) 710 #define _OUT(_field) offsetof(struct nl_parsed_ifa, _field) 711 static const struct nlfield_parser nlf_p_ifa[] = { 712 { .off_in = _IN(ifa_family), .off_out = _OUT(ifa_family), .cb = nlf_get_u8 }, 713 { .off_in = _IN(ifa_prefixlen), .off_out = _OUT(ifa_prefixlen), .cb = nlf_get_u8 }, 714 { .off_in = _IN(ifa_scope), .off_out = _OUT(ifa_scope), .cb = nlf_get_u8 }, 715 { .off_in = _IN(ifa_flags), .off_out = _OUT(ifa_flags), .cb = nlf_get_u8_u32 }, 716 { .off_in = _IN(ifa_index), .off_out = _OUT(ifa_index), .cb = nlf_get_u32 }, 717 }; 718 719 static const struct nlattr_parser nla_p_ifa_fbsd[] = { 720 { .type = IFAF_VHID, .off = _OUT(ifaf_vhid), .cb = nlattr_get_uint32 }, 721 { .type = IFAF_FLAGS, .off = _OUT(ifaf_flags), .cb = nlattr_get_uint32 }, 722 }; 723 NL_DECLARE_ATTR_PARSER(ifa_fbsd_parser, nla_p_ifa_fbsd); 724 725 static const struct nlattr_parser nla_p_ifa[] = { 726 { .type = IFA_ADDRESS, .off = _OUT(ifa_address), .cb = nlattr_get_ip }, 727 { .type = IFA_LOCAL, .off = _OUT(ifa_local), .cb = nlattr_get_ip }, 728 { .type = IFA_BROADCAST, .off = _OUT(ifa_broadcast), .cb = nlattr_get_ip }, 729 { .type = IFA_CACHEINFO, .off = _OUT(ifa_cacheinfo), .cb = nlattr_get_cinfo }, 730 { .type = IFA_FLAGS, .off = _OUT(ifa_flags), .cb = nlattr_get_uint32 }, 731 { .type = IFA_FREEBSD, .arg = &ifa_fbsd_parser, .cb = nlattr_get_nested }, 732 }; 733 #undef _IN 734 #undef _OUT 735 736 static bool 737 post_p_ifa(void *_attrs, struct nl_pstate *npt) 738 { 739 struct nl_parsed_ifa *attrs = (struct nl_parsed_ifa *)_attrs; 740 741 if (!check_sa_family(attrs->ifa_address, attrs->ifa_family, "IFA_ADDRESS", npt)) 742 return (false); 743 if (!check_sa_family(attrs->ifa_local, attrs->ifa_family, "IFA_LOCAL", npt)) 744 return (false); 745 if (!check_sa_family(attrs->ifa_broadcast, attrs->ifa_family, "IFA_BROADADDR", npt)) 746 return (false); 747 748 set_scope6(attrs->ifa_address, attrs->ifa_index); 749 set_scope6(attrs->ifa_local, attrs->ifa_index); 750 751 return (true); 752 } 753 754 NL_DECLARE_PARSER_EXT(ifa_parser, struct ifaddrmsg, NULL, nlf_p_ifa, nla_p_ifa, post_p_ifa); 755 756 757 /* 758 759 {ifa_family=AF_INET, ifa_prefixlen=8, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_HOST, ifa_index=if_nametoindex("lo")}, 760 [ 761 {{nla_len=8, nla_type=IFA_ADDRESS}, inet_addr("127.0.0.1")}, 762 {{nla_len=8, nla_type=IFA_LOCAL}, inet_addr("127.0.0.1")}, 763 {{nla_len=7, nla_type=IFA_LABEL}, "lo"}, 764 {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}, 765 {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=3619, tstamp=3619}}]}, 766 --- 767 768 {{len=72, type=RTM_NEWADDR, flags=NLM_F_MULTI, seq=1642191126, pid=566735}, 769 {ifa_family=AF_INET6, ifa_prefixlen=96, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_UNIVERSE, ifa_index=if_nametoindex("virbr0")}, 770 [ 771 {{nla_len=20, nla_type=IFA_ADDRESS}, inet_pton(AF_INET6, "2a01:4f8:13a:70c:ffff::1")}, 772 {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=4283, tstamp=4283}}, 773 {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}]}, 774 */ 775 776 static uint8_t 777 ifa_get_scope(const struct ifaddr *ifa) 778 { 779 const struct sockaddr *sa; 780 uint8_t addr_scope = RT_SCOPE_UNIVERSE; 781 782 sa = ifa->ifa_addr; 783 switch (sa->sa_family) { 784 #ifdef INET 785 case AF_INET: 786 { 787 struct in_addr addr; 788 addr = ((const struct sockaddr_in *)sa)->sin_addr; 789 if (IN_LOOPBACK(addr.s_addr)) 790 addr_scope = RT_SCOPE_HOST; 791 else if (IN_LINKLOCAL(addr.s_addr)) 792 addr_scope = RT_SCOPE_LINK; 793 break; 794 } 795 #endif 796 #ifdef INET6 797 case AF_INET6: 798 { 799 const struct in6_addr *addr; 800 addr = &((const struct sockaddr_in6 *)sa)->sin6_addr; 801 if (IN6_IS_ADDR_LOOPBACK(addr)) 802 addr_scope = RT_SCOPE_HOST; 803 else if (IN6_IS_ADDR_LINKLOCAL(addr)) 804 addr_scope = RT_SCOPE_LINK; 805 break; 806 } 807 #endif 808 } 809 810 return (addr_scope); 811 } 812 813 #ifdef INET6 814 static uint8_t 815 inet6_get_plen(const struct in6_addr *addr) 816 { 817 818 return (bitcount32(addr->s6_addr32[0]) + bitcount32(addr->s6_addr32[1]) + 819 bitcount32(addr->s6_addr32[2]) + bitcount32(addr->s6_addr32[3])); 820 } 821 #endif 822 823 static uint8_t 824 get_sa_plen(const struct sockaddr *sa) 825 { 826 #ifdef INET 827 const struct in_addr *paddr; 828 #endif 829 #ifdef INET6 830 const struct in6_addr *paddr6; 831 #endif 832 833 switch (sa->sa_family) { 834 #ifdef INET 835 case AF_INET: 836 paddr = &(((const struct sockaddr_in *)sa)->sin_addr); 837 return bitcount32(paddr->s_addr);; 838 #endif 839 #ifdef INET6 840 case AF_INET6: 841 paddr6 = &(((const struct sockaddr_in6 *)sa)->sin6_addr); 842 return inet6_get_plen(paddr6); 843 #endif 844 } 845 846 return (0); 847 } 848 849 #ifdef INET6 850 static uint32_t 851 in6_flags_to_nl(uint32_t flags) 852 { 853 uint32_t nl_flags = 0; 854 855 if (flags & IN6_IFF_TEMPORARY) 856 nl_flags |= IFA_F_TEMPORARY; 857 if (flags & IN6_IFF_NODAD) 858 nl_flags |= IFA_F_NODAD; 859 if (flags & IN6_IFF_DEPRECATED) 860 nl_flags |= IFA_F_DEPRECATED; 861 if (flags & IN6_IFF_TENTATIVE) 862 nl_flags |= IFA_F_TENTATIVE; 863 if ((flags & (IN6_IFF_AUTOCONF|IN6_IFF_TEMPORARY)) == 0) 864 flags |= IFA_F_PERMANENT; 865 if (flags & IN6_IFF_DUPLICATED) 866 flags |= IFA_F_DADFAILED; 867 return (nl_flags); 868 } 869 870 static uint32_t 871 nl_flags_to_in6(uint32_t flags) 872 { 873 uint32_t in6_flags = 0; 874 875 if (flags & IFA_F_TEMPORARY) 876 in6_flags |= IN6_IFF_TEMPORARY; 877 if (flags & IFA_F_NODAD) 878 in6_flags |= IN6_IFF_NODAD; 879 if (flags & IFA_F_DEPRECATED) 880 in6_flags |= IN6_IFF_DEPRECATED; 881 if (flags & IFA_F_TENTATIVE) 882 in6_flags |= IN6_IFF_TENTATIVE; 883 if (flags & IFA_F_DADFAILED) 884 in6_flags |= IN6_IFF_DUPLICATED; 885 886 return (in6_flags); 887 } 888 889 static void 890 export_cache_info6(struct nl_writer *nw, const struct in6_ifaddr *ia) 891 { 892 struct ifa_cacheinfo ci = { 893 .cstamp = ia->ia6_createtime * 1000, 894 .tstamp = ia->ia6_updatetime * 1000, 895 .ifa_prefered = ia->ia6_lifetime.ia6t_pltime, 896 .ifa_valid = ia->ia6_lifetime.ia6t_vltime, 897 }; 898 899 nlattr_add(nw, IFA_CACHEINFO, sizeof(ci), &ci); 900 } 901 #endif 902 903 static void 904 export_cache_info(struct nl_writer *nw, struct ifaddr *ifa) 905 { 906 switch (ifa->ifa_addr->sa_family) { 907 #ifdef INET6 908 case AF_INET6: 909 export_cache_info6(nw, (struct in6_ifaddr *)ifa); 910 break; 911 #endif 912 } 913 } 914 915 /* 916 * {'attrs': [('IFA_ADDRESS', '12.0.0.1'), 917 ('IFA_LOCAL', '12.0.0.1'), 918 ('IFA_LABEL', 'eth10'), 919 ('IFA_FLAGS', 128), 920 ('IFA_CACHEINFO', {'ifa_preferred': 4294967295, 'ifa_valid': 4294967295, 'cstamp': 63745746, 'tstamp': 63745746})], 921 */ 922 static bool 923 dump_iface_addr(struct nl_writer *nw, struct ifnet *ifp, struct ifaddr *ifa, 924 const struct nlmsghdr *hdr) 925 { 926 struct ifaddrmsg *ifamsg; 927 struct sockaddr *sa = ifa->ifa_addr; 928 struct sockaddr *sa_dst = ifa->ifa_dstaddr; 929 930 NL_LOG(LOG_DEBUG3, "dumping ifa %p type %s(%d) for interface %s", 931 ifa, rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp)); 932 933 if (!nlmsg_reply(nw, hdr, sizeof(struct ifaddrmsg))) 934 goto enomem; 935 936 ifamsg = nlmsg_reserve_object(nw, struct ifaddrmsg); 937 ifamsg->ifa_family = sa->sa_family; 938 ifamsg->ifa_prefixlen = get_sa_plen(ifa->ifa_netmask); 939 ifamsg->ifa_flags = 0; // ifa_flags is useless 940 ifamsg->ifa_scope = ifa_get_scope(ifa); 941 ifamsg->ifa_index = ifp->if_index; 942 943 if ((ifp->if_flags & IFF_POINTOPOINT) && sa_dst != NULL && sa_dst->sa_family != 0) { 944 /* P2P interface may have IPv6 LL with no dst address */ 945 dump_sa(nw, IFA_ADDRESS, sa_dst); 946 dump_sa(nw, IFA_LOCAL, sa); 947 } else { 948 dump_sa(nw, IFA_ADDRESS, sa); 949 #ifdef INET 950 /* 951 * In most cases, IFA_ADDRESS == IFA_LOCAL 952 * Skip IFA_LOCAL for anything except INET 953 */ 954 if (sa->sa_family == AF_INET) 955 dump_sa(nw, IFA_LOCAL, sa); 956 #endif 957 } 958 if (ifp->if_flags & IFF_BROADCAST) 959 dump_sa(nw, IFA_BROADCAST, ifa->ifa_broadaddr); 960 961 nlattr_add_string(nw, IFA_LABEL, if_name(ifp)); 962 963 uint32_t nl_ifa_flags = 0; 964 #ifdef INET6 965 if (sa->sa_family == AF_INET6) { 966 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 967 nl_ifa_flags = in6_flags_to_nl(ia->ia6_flags); 968 } 969 #endif 970 nlattr_add_u32(nw, IFA_FLAGS, nl_ifa_flags); 971 972 export_cache_info(nw, ifa); 973 974 /* Store FreeBSD-specific attributes */ 975 int off = nlattr_add_nested(nw, IFA_FREEBSD); 976 if (off != 0) { 977 if (ifa->ifa_carp != NULL && carp_get_vhid_p != NULL) { 978 uint32_t vhid = (uint32_t)(*carp_get_vhid_p)(ifa); 979 nlattr_add_u32(nw, IFAF_VHID, vhid); 980 } 981 #ifdef INET6 982 if (sa->sa_family == AF_INET6) { 983 uint32_t ifa_flags = ((struct in6_ifaddr *)ifa)->ia6_flags; 984 985 nlattr_add_u32(nw, IFAF_FLAGS, ifa_flags); 986 } 987 #endif 988 989 nlattr_set_len(nw, off); 990 } 991 992 if (nlmsg_end(nw)) 993 return (true); 994 enomem: 995 NL_LOG(LOG_DEBUG, "Failed to dump ifa type %s(%d) for interface %s", 996 rib_print_family(sa->sa_family), sa->sa_family, if_name(ifp)); 997 nlmsg_abort(nw); 998 return (false); 999 } 1000 1001 static int 1002 dump_iface_addrs(struct netlink_walkargs *wa, struct ifnet *ifp) 1003 { 1004 struct ifaddr *ifa; 1005 1006 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 1007 if (wa->family != 0 && wa->family != ifa->ifa_addr->sa_family) 1008 continue; 1009 if (ifa->ifa_addr->sa_family == AF_LINK) 1010 continue; 1011 if (prison_if(wa->cred, ifa->ifa_addr) != 0) 1012 continue; 1013 wa->count++; 1014 if (!dump_iface_addr(wa->nw, ifp, ifa, &wa->hdr)) 1015 return (ENOMEM); 1016 wa->dumped++; 1017 } 1018 1019 return (0); 1020 } 1021 1022 static int 1023 rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 1024 { 1025 struct ifnet *ifp; 1026 int error = 0; 1027 1028 struct nl_parsed_ifa attrs = {}; 1029 error = nl_parse_nlmsg(hdr, &ifa_parser, npt, &attrs); 1030 if (error != 0) 1031 return (error); 1032 1033 struct netlink_walkargs wa = { 1034 .so = nlp, 1035 .nw = npt->nw, 1036 .cred = nlp_get_cred(nlp), 1037 .family = attrs.ifa_family, 1038 .hdr.nlmsg_pid = hdr->nlmsg_pid, 1039 .hdr.nlmsg_seq = hdr->nlmsg_seq, 1040 .hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI, 1041 .hdr.nlmsg_type = NL_RTM_NEWADDR, 1042 }; 1043 1044 NL_LOG(LOG_DEBUG2, "Start dump"); 1045 1046 if (attrs.ifa_index != 0) { 1047 ifp = ifnet_byindex(attrs.ifa_index); 1048 if (ifp == NULL) 1049 error = ENOENT; 1050 else 1051 error = dump_iface_addrs(&wa, ifp); 1052 } else { 1053 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 1054 error = dump_iface_addrs(&wa, ifp); 1055 if (error != 0) 1056 break; 1057 } 1058 } 1059 1060 NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped); 1061 1062 if (!nlmsg_end_dump(wa.nw, error, &wa.hdr)) { 1063 NL_LOG(LOG_DEBUG, "Unable to finalize the dump"); 1064 return (ENOMEM); 1065 } 1066 1067 return (error); 1068 } 1069 1070 #ifdef INET 1071 static int 1072 handle_newaddr_inet(struct nlmsghdr *hdr, struct nl_parsed_ifa *attrs, 1073 struct ifnet *ifp, struct nlpcb *nlp, struct nl_pstate *npt) 1074 { 1075 int plen = attrs->ifa_prefixlen; 1076 int if_flags = if_getflags(ifp); 1077 struct sockaddr_in *addr, *dst; 1078 1079 if (plen > 32) { 1080 nlmsg_report_err_msg(npt, "invalid ifa_prefixlen"); 1081 return (EINVAL); 1082 }; 1083 1084 if (if_flags & IFF_POINTOPOINT) { 1085 /* 1086 * Only P2P IFAs are allowed by the implementation. 1087 */ 1088 if (attrs->ifa_address == NULL || attrs->ifa_local == NULL) { 1089 nlmsg_report_err_msg(npt, "Empty IFA_LOCAL/IFA_ADDRESS"); 1090 return (EINVAL); 1091 } 1092 addr = (struct sockaddr_in *)attrs->ifa_local; 1093 dst = (struct sockaddr_in *)attrs->ifa_address; 1094 } else { 1095 /* 1096 * Map the Netlink attributes to FreeBSD ifa layout. 1097 * If only IFA_ADDRESS or IFA_LOCAL is set OR 1098 * both are set to the same value => ifa is not p2p 1099 * and the attribute value contains interface address. 1100 * 1101 * Otherwise (both IFA_ADDRESS and IFA_LOCAL are set and 1102 * different), IFA_LOCAL contains an interface address and 1103 * IFA_ADDRESS contains peer address. 1104 */ 1105 addr = (struct sockaddr_in *)attrs->ifa_local; 1106 if (addr == NULL) 1107 addr = (struct sockaddr_in *)attrs->ifa_address; 1108 1109 if (addr == NULL) { 1110 nlmsg_report_err_msg(npt, "Empty IFA_LOCAL/IFA_ADDRESS"); 1111 return (EINVAL); 1112 } 1113 1114 /* Generate broadcast address if not set */ 1115 if ((if_flags & IFF_BROADCAST) && attrs->ifa_broadcast == NULL) { 1116 uint32_t s_baddr; 1117 struct sockaddr_in *sin_brd; 1118 1119 if (plen == 31) 1120 s_baddr = INADDR_BROADCAST; /* RFC 3021 */ 1121 else { 1122 uint32_t s_mask; 1123 1124 s_mask = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0); 1125 s_baddr = addr->sin_addr.s_addr | ~s_mask; 1126 } 1127 1128 sin_brd = (struct sockaddr_in *)npt_alloc(npt, sizeof(*sin_brd)); 1129 if (sin_brd == NULL) 1130 return (ENOMEM); 1131 sin_brd->sin_family = AF_INET; 1132 sin_brd->sin_len = sizeof(*sin_brd); 1133 sin_brd->sin_addr.s_addr = s_baddr; 1134 attrs->ifa_broadcast = (struct sockaddr *)sin_brd; 1135 } 1136 dst = (struct sockaddr_in *)attrs->ifa_broadcast; 1137 } 1138 1139 struct sockaddr_in mask = { 1140 .sin_len = sizeof(struct sockaddr_in), 1141 .sin_family = AF_INET, 1142 .sin_addr.s_addr = htonl(plen ? ~((1 << (32 - plen)) - 1) : 0), 1143 }; 1144 struct in_aliasreq req = { 1145 .ifra_addr = *addr, 1146 .ifra_mask = mask, 1147 .ifra_vhid = attrs->ifaf_vhid, 1148 }; 1149 if (dst != NULL) 1150 req.ifra_dstaddr = *dst; 1151 1152 return (in_control(NULL, SIOCAIFADDR, &req, ifp, curthread)); 1153 } 1154 1155 static int 1156 handle_deladdr_inet(struct nlmsghdr *hdr, struct nl_parsed_ifa *attrs, 1157 struct ifnet *ifp, struct nlpcb *nlp, struct nl_pstate *npt) 1158 { 1159 struct sockaddr_in *addr = (struct sockaddr_in *)attrs->ifa_local; 1160 1161 if (addr == NULL) 1162 addr = (struct sockaddr_in *)attrs->ifa_address; 1163 1164 if (addr == NULL) { 1165 nlmsg_report_err_msg(npt, "empty IFA_ADDRESS/IFA_LOCAL"); 1166 return (EINVAL); 1167 } 1168 1169 struct in_aliasreq req = { .ifra_addr = *addr }; 1170 1171 return (in_control(NULL, SIOCDIFADDR, &req, ifp, curthread)); 1172 } 1173 #endif 1174 1175 #ifdef INET6 1176 static int 1177 handle_newaddr_inet6(struct nlmsghdr *hdr, struct nl_parsed_ifa *attrs, 1178 struct ifnet *ifp, struct nlpcb *nlp, struct nl_pstate *npt) 1179 { 1180 struct sockaddr_in6 *addr, *dst; 1181 1182 if (attrs->ifa_prefixlen > 128) { 1183 nlmsg_report_err_msg(npt, "invalid ifa_prefixlen"); 1184 return (EINVAL); 1185 } 1186 1187 /* 1188 * In IPv6 implementation, adding non-P2P address to the P2P interface 1189 * is allowed. 1190 */ 1191 addr = (struct sockaddr_in6 *)(attrs->ifa_local); 1192 dst = (struct sockaddr_in6 *)(attrs->ifa_address); 1193 1194 if (addr == NULL) { 1195 addr = dst; 1196 dst = NULL; 1197 } else if (dst != NULL) { 1198 if (IN6_ARE_ADDR_EQUAL(&addr->sin6_addr, &dst->sin6_addr)) { 1199 /* 1200 * Sometimes Netlink users fills in both attributes 1201 * with the same address. It still means "non-p2p". 1202 */ 1203 dst = NULL; 1204 } 1205 } 1206 1207 if (addr == NULL) { 1208 nlmsg_report_err_msg(npt, "Empty IFA_LOCAL/IFA_ADDRESS"); 1209 return (EINVAL); 1210 } 1211 1212 uint32_t flags = nl_flags_to_in6(attrs->ifa_flags) | attrs->ifaf_flags; 1213 1214 uint32_t pltime = 0, vltime = 0; 1215 if (attrs->ifa_cacheinfo != 0) { 1216 pltime = attrs->ifa_cacheinfo->ifa_prefered; 1217 vltime = attrs->ifa_cacheinfo->ifa_valid; 1218 } 1219 1220 struct sockaddr_in6 mask = { 1221 .sin6_len = sizeof(struct sockaddr_in6), 1222 .sin6_family = AF_INET6, 1223 }; 1224 ip6_writemask(&mask.sin6_addr, attrs->ifa_prefixlen); 1225 1226 struct in6_aliasreq req = { 1227 .ifra_addr = *addr, 1228 .ifra_prefixmask = mask, 1229 .ifra_flags = flags, 1230 .ifra_lifetime = { .ia6t_vltime = vltime, .ia6t_pltime = pltime }, 1231 .ifra_vhid = attrs->ifaf_vhid, 1232 }; 1233 if (dst != NULL) 1234 req.ifra_dstaddr = *dst; 1235 1236 return (in6_control(NULL, SIOCAIFADDR_IN6, &req, ifp, curthread)); 1237 } 1238 1239 static int 1240 handle_deladdr_inet6(struct nlmsghdr *hdr, struct nl_parsed_ifa *attrs, 1241 struct ifnet *ifp, struct nlpcb *nlp, struct nl_pstate *npt) 1242 { 1243 struct sockaddr_in6 *addr = (struct sockaddr_in6 *)attrs->ifa_local; 1244 1245 if (addr == NULL) 1246 addr = (struct sockaddr_in6 *)(attrs->ifa_address); 1247 1248 if (addr == NULL) { 1249 nlmsg_report_err_msg(npt, "Empty IFA_LOCAL/IFA_ADDRESS"); 1250 return (EINVAL); 1251 } 1252 1253 struct in6_aliasreq req = { .ifra_addr = *addr }; 1254 1255 return (in6_control(NULL, SIOCDIFADDR_IN6, &req, ifp, curthread)); 1256 } 1257 #endif 1258 1259 1260 static int 1261 rtnl_handle_addr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt) 1262 { 1263 struct epoch_tracker et; 1264 int error; 1265 1266 struct nl_parsed_ifa attrs = {}; 1267 error = nl_parse_nlmsg(hdr, &ifa_parser, npt, &attrs); 1268 if (error != 0) 1269 return (error); 1270 1271 NET_EPOCH_ENTER(et); 1272 struct ifnet *ifp = ifnet_byindex_ref(attrs.ifa_index); 1273 NET_EPOCH_EXIT(et); 1274 1275 if (ifp == NULL) { 1276 nlmsg_report_err_msg(npt, "Unable to find interface with index %u", 1277 attrs.ifa_index); 1278 return (ENOENT); 1279 } 1280 #ifdef INET6 1281 int if_flags = if_getflags(ifp); 1282 #endif 1283 1284 #if defined(INET) || defined(INET6) 1285 bool new = hdr->nlmsg_type == NL_RTM_NEWADDR; 1286 #endif 1287 1288 /* 1289 * TODO: Properly handle NLM_F_CREATE / NLM_F_EXCL. 1290 * The current ioctl-based KPI always does an implicit create-or-replace. 1291 * It is not possible to specify fine-grained options. 1292 */ 1293 1294 switch (attrs.ifa_family) { 1295 #ifdef INET 1296 case AF_INET: 1297 if (new) 1298 error = handle_newaddr_inet(hdr, &attrs, ifp, nlp, npt); 1299 else 1300 error = handle_deladdr_inet(hdr, &attrs, ifp, nlp, npt); 1301 break; 1302 #endif 1303 #ifdef INET6 1304 case AF_INET6: 1305 if (new) 1306 error = handle_newaddr_inet6(hdr, &attrs, ifp, nlp, npt); 1307 else 1308 error = handle_deladdr_inet6(hdr, &attrs, ifp, nlp, npt); 1309 break; 1310 #endif 1311 default: 1312 error = EAFNOSUPPORT; 1313 } 1314 1315 if (error == 0 && !(if_flags & IFF_UP) && (if_getflags(ifp) & IFF_UP)) 1316 if_up(ifp); 1317 1318 if_rele(ifp); 1319 1320 return (error); 1321 } 1322 1323 1324 static void 1325 rtnl_handle_ifaddr(void *arg __unused, struct ifaddr *ifa, int cmd) 1326 { 1327 struct nlmsghdr hdr = {}; 1328 struct nl_writer nw = {}; 1329 uint32_t group = 0; 1330 1331 switch (ifa->ifa_addr->sa_family) { 1332 #ifdef INET 1333 case AF_INET: 1334 group = RTNLGRP_IPV4_IFADDR; 1335 break; 1336 #endif 1337 #ifdef INET6 1338 case AF_INET6: 1339 group = RTNLGRP_IPV6_IFADDR; 1340 break; 1341 #endif 1342 default: 1343 NL_LOG(LOG_DEBUG2, "ifa notification for unknown AF: %d", 1344 ifa->ifa_addr->sa_family); 1345 return; 1346 } 1347 1348 if (!nl_has_listeners(NETLINK_ROUTE, group)) 1349 return; 1350 1351 if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, group)) { 1352 NL_LOG(LOG_DEBUG, "error allocating group writer"); 1353 return; 1354 } 1355 1356 hdr.nlmsg_type = (cmd == RTM_DELETE) ? NL_RTM_DELADDR : NL_RTM_NEWADDR; 1357 1358 dump_iface_addr(&nw, ifa->ifa_ifp, ifa, &hdr); 1359 nlmsg_flush(&nw); 1360 } 1361 1362 static void 1363 rtnl_handle_ifevent(struct ifnet *ifp, int nlmsg_type, int if_flags_mask) 1364 { 1365 struct nlmsghdr hdr = { .nlmsg_type = nlmsg_type }; 1366 struct nl_writer nw = {}; 1367 1368 if (!nl_has_listeners(NETLINK_ROUTE, RTNLGRP_LINK)) 1369 return; 1370 1371 if (!nlmsg_get_group_writer(&nw, NLMSG_LARGE, NETLINK_ROUTE, RTNLGRP_LINK)) { 1372 NL_LOG(LOG_DEBUG, "error allocating mbuf"); 1373 return; 1374 } 1375 dump_iface(&nw, ifp, &hdr, if_flags_mask); 1376 nlmsg_flush(&nw); 1377 } 1378 1379 static void 1380 rtnl_handle_ifattach(void *arg, struct ifnet *ifp) 1381 { 1382 NL_LOG(LOG_DEBUG2, "ifnet %s", if_name(ifp)); 1383 rtnl_handle_ifevent(ifp, NL_RTM_NEWLINK, 0); 1384 } 1385 1386 static void 1387 rtnl_handle_ifdetach(void *arg, struct ifnet *ifp) 1388 { 1389 NL_LOG(LOG_DEBUG2, "ifnet %s", if_name(ifp)); 1390 rtnl_handle_ifevent(ifp, NL_RTM_DELLINK, 0); 1391 } 1392 1393 static void 1394 rtnl_handle_iflink(void *arg, struct ifnet *ifp) 1395 { 1396 NL_LOG(LOG_DEBUG2, "ifnet %s", if_name(ifp)); 1397 rtnl_handle_ifevent(ifp, NL_RTM_NEWLINK, 0); 1398 } 1399 1400 void 1401 rtnl_handle_ifnet_event(struct ifnet *ifp, int if_flags_mask) 1402 { 1403 NL_LOG(LOG_DEBUG2, "ifnet %s", if_name(ifp)); 1404 rtnl_handle_ifevent(ifp, NL_RTM_NEWLINK, if_flags_mask); 1405 } 1406 1407 static const struct rtnl_cmd_handler cmd_handlers[] = { 1408 { 1409 .cmd = NL_RTM_GETLINK, 1410 .name = "RTM_GETLINK", 1411 .cb = &rtnl_handle_getlink, 1412 .flags = RTNL_F_NOEPOCH | RTNL_F_ALLOW_NONVNET_JAIL, 1413 }, 1414 { 1415 .cmd = NL_RTM_DELLINK, 1416 .name = "RTM_DELLINK", 1417 .cb = &rtnl_handle_dellink, 1418 .priv = PRIV_NET_IFDESTROY, 1419 .flags = RTNL_F_NOEPOCH, 1420 }, 1421 { 1422 .cmd = NL_RTM_NEWLINK, 1423 .name = "RTM_NEWLINK", 1424 .cb = &rtnl_handle_newlink, 1425 .priv = PRIV_NET_IFCREATE, 1426 .flags = RTNL_F_NOEPOCH, 1427 }, 1428 { 1429 .cmd = NL_RTM_GETADDR, 1430 .name = "RTM_GETADDR", 1431 .cb = &rtnl_handle_getaddr, 1432 .flags = RTNL_F_ALLOW_NONVNET_JAIL, 1433 }, 1434 { 1435 .cmd = NL_RTM_NEWADDR, 1436 .name = "RTM_NEWADDR", 1437 .cb = &rtnl_handle_addr, 1438 .priv = PRIV_NET_ADDIFADDR, 1439 .flags = RTNL_F_NOEPOCH, 1440 }, 1441 { 1442 .cmd = NL_RTM_DELADDR, 1443 .name = "RTM_DELADDR", 1444 .cb = &rtnl_handle_addr, 1445 .priv = PRIV_NET_DELIFADDR, 1446 .flags = RTNL_F_NOEPOCH, 1447 }, 1448 }; 1449 1450 static const struct nlhdr_parser *all_parsers[] = { 1451 &ifmsg_parser, &ifa_parser, &ifa_fbsd_parser, 1452 }; 1453 1454 void 1455 rtnl_iface_add_cloner(struct nl_cloner *cloner) 1456 { 1457 sx_xlock(&rtnl_cloner_lock); 1458 SLIST_INSERT_HEAD(&nl_cloners, cloner, next); 1459 sx_xunlock(&rtnl_cloner_lock); 1460 } 1461 1462 void 1463 rtnl_iface_del_cloner(struct nl_cloner *cloner) 1464 { 1465 sx_xlock(&rtnl_cloner_lock); 1466 SLIST_REMOVE(&nl_cloners, cloner, nl_cloner, next); 1467 sx_xunlock(&rtnl_cloner_lock); 1468 } 1469 1470 void 1471 rtnl_ifaces_init(void) 1472 { 1473 ifattach_event = EVENTHANDLER_REGISTER( 1474 ifnet_arrival_event, rtnl_handle_ifattach, NULL, 1475 EVENTHANDLER_PRI_ANY); 1476 ifdetach_event = EVENTHANDLER_REGISTER( 1477 ifnet_departure_event, rtnl_handle_ifdetach, NULL, 1478 EVENTHANDLER_PRI_ANY); 1479 ifaddr_event = EVENTHANDLER_REGISTER( 1480 rt_addrmsg, rtnl_handle_ifaddr, NULL, 1481 EVENTHANDLER_PRI_ANY); 1482 iflink_event = EVENTHANDLER_REGISTER( 1483 ifnet_link_event, rtnl_handle_iflink, NULL, 1484 EVENTHANDLER_PRI_ANY); 1485 NL_VERIFY_PARSERS(all_parsers); 1486 rtnl_register_messages(cmd_handlers, NL_ARRAY_LEN(cmd_handlers)); 1487 } 1488 1489 void 1490 rtnl_ifaces_destroy(void) 1491 { 1492 EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ifattach_event); 1493 EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_event); 1494 EVENTHANDLER_DEREGISTER(rt_addrmsg, ifaddr_event); 1495 EVENTHANDLER_DEREGISTER(ifnet_link_event, iflink_event); 1496 } 1497