1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1980, 1986, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)route.c 8.3.1.1 (Berkeley) 2/23/95 32 * $FreeBSD$ 33 */ 34 /************************************************************************ 35 * Note: In this file a 'fib' is a "forwarding information base" * 36 * Which is the new name for an in kernel routing (next hop) table. * 37 ***********************************************************************/ 38 39 #include "opt_inet.h" 40 #include "opt_inet6.h" 41 #include "opt_mrouting.h" 42 #include "opt_mpath.h" 43 #include "opt_route.h" 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/socket.h> 50 #include <sys/sysctl.h> 51 #include <sys/syslog.h> 52 #include <sys/sysproto.h> 53 #include <sys/proc.h> 54 #include <sys/domain.h> 55 #include <sys/eventhandler.h> 56 #include <sys/kernel.h> 57 #include <sys/lock.h> 58 #include <sys/rmlock.h> 59 60 #include <net/if.h> 61 #include <net/if_var.h> 62 #include <net/if_dl.h> 63 #include <net/route.h> 64 #include <net/route/route_ctl.h> 65 #include <net/route/route_var.h> 66 #include <net/route/nhop.h> 67 #include <net/route/shared.h> 68 #include <net/vnet.h> 69 70 #ifdef RADIX_MPATH 71 #include <net/radix_mpath.h> 72 #endif 73 74 #include <netinet/in.h> 75 #include <netinet/ip_mroute.h> 76 77 /* 78 * By default add routes to all fibs for new interfaces. 79 * Once this is set to 0 then only allocate routes on interface 80 * changes for the FIB of the caller when adding a new set of addresses 81 * to an interface. XXX this is a shotgun aproach to a problem that needs 82 * a more fine grained solution.. that will come. 83 * XXX also has the problems getting the FIB from curthread which will not 84 * always work given the fib can be overridden and prefixes can be added 85 * from the network stack context. 86 */ 87 VNET_DEFINE(u_int, rt_add_addr_allfibs) = 1; 88 SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET, 89 &VNET_NAME(rt_add_addr_allfibs), 0, ""); 90 91 VNET_PCPUSTAT_DEFINE(struct rtstat, rtstat); 92 93 VNET_PCPUSTAT_SYSINIT(rtstat); 94 #ifdef VIMAGE 95 VNET_PCPUSTAT_SYSUNINIT(rtstat); 96 #endif 97 98 EVENTHANDLER_LIST_DEFINE(rt_addrmsg); 99 100 static int rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *, 101 void *arg); 102 static int rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, 103 int flags); 104 105 /* 106 * route initialization must occur before ip6_init2(), which happenas at 107 * SI_ORDER_MIDDLE. 108 */ 109 static void 110 route_init(void) 111 { 112 113 nhops_init(); 114 } 115 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, NULL); 116 117 struct rib_head * 118 rt_table_init(int offset, int family, u_int fibnum) 119 { 120 struct rib_head *rh; 121 122 rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO); 123 124 /* TODO: These details should be hidded inside radix.c */ 125 /* Init masks tree */ 126 rn_inithead_internal(&rh->head, rh->rnh_nodes, offset); 127 rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0); 128 rh->head.rnh_masks = &rh->rmhead; 129 130 /* Save metadata associated with this routing table. */ 131 rh->rib_family = family; 132 rh->rib_fibnum = fibnum; 133 #ifdef VIMAGE 134 rh->rib_vnet = curvnet; 135 #endif 136 137 tmproutes_init(rh); 138 139 /* Init locks */ 140 RIB_LOCK_INIT(rh); 141 142 nhops_init_rib(rh); 143 144 /* Init subscription system */ 145 rib_init_subscriptions(rh); 146 147 /* Finally, set base callbacks */ 148 rh->rnh_addaddr = rn_addroute; 149 rh->rnh_deladdr = rn_delete; 150 rh->rnh_matchaddr = rn_match; 151 rh->rnh_lookup = rn_lookup; 152 rh->rnh_walktree = rn_walktree; 153 rh->rnh_walktree_from = rn_walktree_from; 154 155 return (rh); 156 } 157 158 static int 159 rt_freeentry(struct radix_node *rn, void *arg) 160 { 161 struct radix_head * const rnh = arg; 162 struct radix_node *x; 163 164 x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh); 165 if (x != NULL) 166 R_Free(x); 167 return (0); 168 } 169 170 void 171 rt_table_destroy(struct rib_head *rh) 172 { 173 174 tmproutes_destroy(rh); 175 176 rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head); 177 178 nhops_destroy_rib(rh); 179 180 rib_destroy_subscriptions(rh); 181 182 /* Assume table is already empty */ 183 RIB_LOCK_DESTROY(rh); 184 free(rh, M_RTABLE); 185 } 186 187 /* 188 * Adds a temporal redirect entry to the routing table. 189 * @fibnum: fib number 190 * @dst: destination to install redirect to 191 * @gateway: gateway to go via 192 * @author: sockaddr of originating router, can be NULL 193 * @ifp: interface to use for the redirected route 194 * @flags: set of flags to add. Allowed: RTF_GATEWAY 195 * @lifetime_sec: time in seconds to expire this redirect. 196 * 197 * Retuns 0 on success, errno otherwise. 198 */ 199 int 200 rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway, 201 struct sockaddr *author, struct ifnet *ifp, int flags, int lifetime_sec) 202 { 203 struct rib_cmd_info rc; 204 int error; 205 struct rt_addrinfo info; 206 struct rt_metrics rti_rmx; 207 struct ifaddr *ifa; 208 209 NET_EPOCH_ASSERT(); 210 211 if (rt_tables_get_rnh(fibnum, dst->sa_family) == NULL) 212 return (EAFNOSUPPORT); 213 214 /* Verify the allowed flag mask. */ 215 KASSERT(((flags & ~(RTF_GATEWAY)) == 0), 216 ("invalid redirect flags: %x", flags)); 217 flags |= RTF_HOST | RTF_DYNAMIC; 218 219 /* Get the best ifa for the given interface and gateway. */ 220 if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL) 221 return (ENETUNREACH); 222 ifa_ref(ifa); 223 224 bzero(&info, sizeof(info)); 225 info.rti_info[RTAX_DST] = dst; 226 info.rti_info[RTAX_GATEWAY] = gateway; 227 info.rti_ifa = ifa; 228 info.rti_ifp = ifp; 229 info.rti_flags = flags; 230 231 /* Setup route metrics to define expire time. */ 232 bzero(&rti_rmx, sizeof(rti_rmx)); 233 /* Set expire time as absolute. */ 234 rti_rmx.rmx_expire = lifetime_sec + time_second; 235 info.rti_mflags |= RTV_EXPIRE; 236 info.rti_rmx = &rti_rmx; 237 238 error = rib_action(fibnum, RTM_ADD, &info, &rc); 239 ifa_free(ifa); 240 241 if (error != 0) { 242 /* TODO: add per-fib redirect stats. */ 243 return (error); 244 } 245 246 RTSTAT_INC(rts_dynamic); 247 248 /* Send notification of a route addition to userland. */ 249 bzero(&info, sizeof(info)); 250 info.rti_info[RTAX_DST] = dst; 251 info.rti_info[RTAX_GATEWAY] = gateway; 252 info.rti_info[RTAX_AUTHOR] = author; 253 rt_missmsg_fib(RTM_REDIRECT, &info, flags | RTF_UP, error, fibnum); 254 255 return (0); 256 } 257 258 /* 259 * Routing table ioctl interface. 260 */ 261 int 262 rtioctl_fib(u_long req, caddr_t data, u_int fibnum) 263 { 264 265 /* 266 * If more ioctl commands are added here, make sure the proper 267 * super-user checks are being performed because it is possible for 268 * prison-root to make it this far if raw sockets have been enabled 269 * in jails. 270 */ 271 #ifdef INET 272 /* Multicast goop, grrr... */ 273 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP; 274 #else /* INET */ 275 return ENXIO; 276 #endif /* INET */ 277 } 278 279 struct ifaddr * 280 ifa_ifwithroute(int flags, const struct sockaddr *dst, 281 const struct sockaddr *gateway, u_int fibnum) 282 { 283 struct ifaddr *ifa; 284 285 NET_EPOCH_ASSERT(); 286 if ((flags & RTF_GATEWAY) == 0) { 287 /* 288 * If we are adding a route to an interface, 289 * and the interface is a pt to pt link 290 * we should search for the destination 291 * as our clue to the interface. Otherwise 292 * we can use the local address. 293 */ 294 ifa = NULL; 295 if (flags & RTF_HOST) 296 ifa = ifa_ifwithdstaddr(dst, fibnum); 297 if (ifa == NULL) 298 ifa = ifa_ifwithaddr(gateway); 299 } else { 300 /* 301 * If we are adding a route to a remote net 302 * or host, the gateway may still be on the 303 * other end of a pt to pt link. 304 */ 305 ifa = ifa_ifwithdstaddr(gateway, fibnum); 306 } 307 if (ifa == NULL) 308 ifa = ifa_ifwithnet(gateway, 0, fibnum); 309 if (ifa == NULL) { 310 struct nhop_object *nh; 311 312 nh = rib_lookup(fibnum, gateway, NHR_NONE, 0); 313 314 /* 315 * dismiss a gateway that is reachable only 316 * through the default router 317 */ 318 if ((nh == NULL) || (nh->nh_flags & NHF_DEFAULT)) 319 return (NULL); 320 ifa = nh->nh_ifa; 321 } 322 if (ifa->ifa_addr->sa_family != dst->sa_family) { 323 struct ifaddr *oifa = ifa; 324 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); 325 if (ifa == NULL) 326 ifa = oifa; 327 } 328 329 return (ifa); 330 } 331 332 333 /* 334 * Copy most of @rt data into @info. 335 * 336 * If @flags contains NHR_COPY, copies dst,netmask and gw to the 337 * pointers specified by @info structure. Assume such pointers 338 * are zeroed sockaddr-like structures with sa_len field initialized 339 * to reflect size of the provided buffer. if no NHR_COPY is specified, 340 * point dst,netmask and gw @info fields to appropriate @rt values. 341 * 342 * if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa. 343 * 344 * Returns 0 on success. 345 */ 346 int 347 rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags) 348 { 349 struct rt_metrics *rmx; 350 struct sockaddr *src, *dst; 351 struct nhop_object *nh; 352 int sa_len; 353 354 nh = rt->rt_nhop; 355 if (flags & NHR_COPY) { 356 /* Copy destination if dst is non-zero */ 357 src = rt_key(rt); 358 dst = info->rti_info[RTAX_DST]; 359 sa_len = src->sa_len; 360 if (dst != NULL) { 361 if (src->sa_len > dst->sa_len) 362 return (ENOMEM); 363 memcpy(dst, src, src->sa_len); 364 info->rti_addrs |= RTA_DST; 365 } 366 367 /* Copy mask if set && dst is non-zero */ 368 src = rt_mask(rt); 369 dst = info->rti_info[RTAX_NETMASK]; 370 if (src != NULL && dst != NULL) { 371 372 /* 373 * Radix stores different value in sa_len, 374 * assume rt_mask() to have the same length 375 * as rt_key() 376 */ 377 if (sa_len > dst->sa_len) 378 return (ENOMEM); 379 memcpy(dst, src, src->sa_len); 380 info->rti_addrs |= RTA_NETMASK; 381 } 382 383 /* Copy gateway is set && dst is non-zero */ 384 src = &nh->gw_sa; 385 dst = info->rti_info[RTAX_GATEWAY]; 386 if ((nhop_get_rtflags(nh) & RTF_GATEWAY) && 387 src != NULL && dst != NULL) { 388 if (src->sa_len > dst->sa_len) 389 return (ENOMEM); 390 memcpy(dst, src, src->sa_len); 391 info->rti_addrs |= RTA_GATEWAY; 392 } 393 } else { 394 info->rti_info[RTAX_DST] = rt_key(rt); 395 info->rti_addrs |= RTA_DST; 396 if (rt_mask(rt) != NULL) { 397 info->rti_info[RTAX_NETMASK] = rt_mask(rt); 398 info->rti_addrs |= RTA_NETMASK; 399 } 400 if (nhop_get_rtflags(nh) & RTF_GATEWAY) { 401 info->rti_info[RTAX_GATEWAY] = &nh->gw_sa; 402 info->rti_addrs |= RTA_GATEWAY; 403 } 404 } 405 406 rmx = info->rti_rmx; 407 if (rmx != NULL) { 408 info->rti_mflags |= RTV_MTU; 409 rmx->rmx_mtu = nh->nh_mtu; 410 } 411 412 info->rti_flags = rt->rte_flags | nhop_get_rtflags(nh); 413 info->rti_ifp = nh->nh_ifp; 414 info->rti_ifa = nh->nh_ifa; 415 if (flags & NHR_REF) { 416 if_ref(info->rti_ifp); 417 ifa_ref(info->rti_ifa); 418 } 419 420 return (0); 421 } 422 423 /* 424 * Lookups up route entry for @dst in RIB database for fib @fibnum. 425 * Exports entry data to @info using rt_exportinfo(). 426 * 427 * If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa. 428 * All references can be released later by calling rib_free_info(). 429 * 430 * Returns 0 on success. 431 * Returns ENOENT for lookup failure, ENOMEM for export failure. 432 */ 433 int 434 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags, 435 uint32_t flowid, struct rt_addrinfo *info) 436 { 437 RIB_RLOCK_TRACKER; 438 struct rib_head *rh; 439 struct radix_node *rn; 440 struct rtentry *rt; 441 int error; 442 443 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum")); 444 rh = rt_tables_get_rnh(fibnum, dst->sa_family); 445 if (rh == NULL) 446 return (ENOENT); 447 448 RIB_RLOCK(rh); 449 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head); 450 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 451 rt = RNTORT(rn); 452 /* Ensure route & ifp is UP */ 453 if (RT_LINK_IS_UP(rt->rt_nhop->nh_ifp)) { 454 flags = (flags & NHR_REF) | NHR_COPY; 455 error = rt_exportinfo(rt, info, flags); 456 RIB_RUNLOCK(rh); 457 458 return (error); 459 } 460 } 461 RIB_RUNLOCK(rh); 462 463 return (ENOENT); 464 } 465 466 /* 467 * Releases all references acquired by rib_lookup_info() when 468 * called with NHR_REF flags. 469 */ 470 void 471 rib_free_info(struct rt_addrinfo *info) 472 { 473 474 ifa_free(info->rti_ifa); 475 if_rele(info->rti_ifp); 476 } 477 478 /* 479 * Iterates over all existing fibs in system calling 480 * @setwa_f function prior to traversing each fib. 481 * Calls @wa_f function for each element in current fib. 482 * If af is not AF_UNSPEC, iterates over fibs in particular 483 * address family. 484 */ 485 void 486 rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f, 487 void *arg) 488 { 489 struct rib_head *rnh; 490 uint32_t fibnum; 491 int i; 492 493 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 494 /* Do we want some specific family? */ 495 if (af != AF_UNSPEC) { 496 rnh = rt_tables_get_rnh(fibnum, af); 497 if (rnh == NULL) 498 continue; 499 if (setwa_f != NULL) 500 setwa_f(rnh, fibnum, af, arg); 501 502 RIB_WLOCK(rnh); 503 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 504 RIB_WUNLOCK(rnh); 505 continue; 506 } 507 508 for (i = 1; i <= AF_MAX; i++) { 509 rnh = rt_tables_get_rnh(fibnum, i); 510 if (rnh == NULL) 511 continue; 512 if (setwa_f != NULL) 513 setwa_f(rnh, fibnum, i, arg); 514 515 RIB_WLOCK(rnh); 516 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 517 RIB_WUNLOCK(rnh); 518 } 519 } 520 } 521 522 /* 523 * Iterates over all existing fibs in system and deletes each element 524 * for which @filter_f function returns non-zero value. 525 * If @family is not AF_UNSPEC, iterates over fibs in particular 526 * address family. 527 */ 528 void 529 rt_foreach_fib_walk_del(int family, rt_filter_f_t *filter_f, void *arg) 530 { 531 u_int fibnum; 532 int i, start, end; 533 534 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 535 /* Do we want some specific family? */ 536 if (family != AF_UNSPEC) { 537 start = family; 538 end = family; 539 } else { 540 start = 1; 541 end = AF_MAX; 542 } 543 544 for (i = start; i <= end; i++) { 545 if (rt_tables_get_rnh(fibnum, i) == NULL) 546 continue; 547 548 rib_walk_del(fibnum, i, filter_f, arg, 0); 549 } 550 } 551 } 552 553 /* 554 * Delete Routes for a Network Interface 555 * 556 * Called for each routing entry via the rnh->rnh_walktree() call above 557 * to delete all route entries referencing a detaching network interface. 558 * 559 * Arguments: 560 * rt pointer to rtentry 561 * nh pointer to nhop 562 * arg argument passed to rnh->rnh_walktree() - detaching interface 563 * 564 * Returns: 565 * 0 successful 566 * errno failed - reason indicated 567 */ 568 static int 569 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg) 570 { 571 struct ifnet *ifp = arg; 572 573 if (nh->nh_ifp != ifp) 574 return (0); 575 576 /* 577 * Protect (sorta) against walktree recursion problems 578 * with cloned routes 579 */ 580 if ((rt->rte_flags & RTF_UP) == 0) 581 return (0); 582 583 return (1); 584 } 585 586 /* 587 * Delete all remaining routes using this interface 588 * Unfortuneatly the only way to do this is to slog through 589 * the entire routing table looking for routes which point 590 * to this interface...oh well... 591 */ 592 void 593 rt_flushifroutes_af(struct ifnet *ifp, int af) 594 { 595 KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d", 596 __func__, af, AF_MAX)); 597 598 rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp); 599 } 600 601 void 602 rt_flushifroutes(struct ifnet *ifp) 603 { 604 605 rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp); 606 } 607 608 /* 609 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined, 610 * it will be referenced so the caller must free it. 611 * 612 * Assume basic consistency checks are executed by callers: 613 * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well. 614 */ 615 int 616 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum) 617 { 618 const struct sockaddr *dst, *gateway, *ifpaddr, *ifaaddr; 619 struct epoch_tracker et; 620 int needref, error, flags; 621 622 dst = info->rti_info[RTAX_DST]; 623 gateway = info->rti_info[RTAX_GATEWAY]; 624 ifpaddr = info->rti_info[RTAX_IFP]; 625 ifaaddr = info->rti_info[RTAX_IFA]; 626 flags = info->rti_flags; 627 628 /* 629 * ifp may be specified by sockaddr_dl 630 * when protocol address is ambiguous. 631 */ 632 error = 0; 633 needref = (info->rti_ifa == NULL); 634 NET_EPOCH_ENTER(et); 635 636 /* If we have interface specified by the ifindex in the address, use it */ 637 if (info->rti_ifp == NULL && ifpaddr != NULL && 638 ifpaddr->sa_family == AF_LINK) { 639 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)ifpaddr; 640 if (sdl->sdl_index != 0) 641 info->rti_ifp = ifnet_byindex(sdl->sdl_index); 642 } 643 /* 644 * If we have source address specified, try to find it 645 * TODO: avoid enumerating all ifas on all interfaces. 646 */ 647 if (info->rti_ifa == NULL && ifaaddr != NULL) 648 info->rti_ifa = ifa_ifwithaddr(ifaaddr); 649 if (info->rti_ifa == NULL) { 650 const struct sockaddr *sa; 651 652 /* 653 * Most common use case for the userland-supplied routes. 654 * 655 * Choose sockaddr to select ifa. 656 * -- if ifp is set -- 657 * Order of preference: 658 * 1) IFA address 659 * 2) gateway address 660 * Note: for interface routes link-level gateway address 661 * is specified to indicate the interface index without 662 * specifying RTF_GATEWAY. In this case, ignore gateway 663 * Note: gateway AF may be different from dst AF. In this case, 664 * ignore gateway 665 * 3) final destination. 666 * 4) if all of these fails, try to get at least link-level ifa. 667 * -- else -- 668 * try to lookup gateway or dst in the routing table to get ifa 669 */ 670 if (info->rti_info[RTAX_IFA] != NULL) 671 sa = info->rti_info[RTAX_IFA]; 672 else if ((info->rti_flags & RTF_GATEWAY) != 0 && 673 gateway->sa_family == dst->sa_family) 674 sa = gateway; 675 else 676 sa = dst; 677 if (info->rti_ifp != NULL) { 678 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); 679 /* Case 4 */ 680 if (info->rti_ifa == NULL && gateway != NULL) 681 info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp); 682 } else if (dst != NULL && gateway != NULL) 683 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway, 684 fibnum); 685 else if (sa != NULL) 686 info->rti_ifa = ifa_ifwithroute(flags, sa, sa, 687 fibnum); 688 } 689 if (needref && info->rti_ifa != NULL) { 690 if (info->rti_ifp == NULL) 691 info->rti_ifp = info->rti_ifa->ifa_ifp; 692 ifa_ref(info->rti_ifa); 693 } else 694 error = ENETUNREACH; 695 NET_EPOCH_EXIT(et); 696 return (error); 697 } 698 699 void 700 rt_updatemtu(struct ifnet *ifp) 701 { 702 struct rib_head *rnh; 703 int mtu; 704 int i, j; 705 706 /* 707 * Try to update rt_mtu for all routes using this interface 708 * Unfortunately the only way to do this is to traverse all 709 * routing tables in all fibs/domains. 710 */ 711 for (i = 1; i <= AF_MAX; i++) { 712 mtu = if_getmtu_family(ifp, i); 713 for (j = 0; j < rt_numfibs; j++) { 714 rnh = rt_tables_get_rnh(j, i); 715 if (rnh == NULL) 716 continue; 717 nhops_update_ifmtu(rnh, ifp, mtu); 718 } 719 } 720 } 721 722 723 #if 0 724 int p_sockaddr(char *buf, int buflen, struct sockaddr *s); 725 int rt_print(char *buf, int buflen, struct rtentry *rt); 726 727 int 728 p_sockaddr(char *buf, int buflen, struct sockaddr *s) 729 { 730 void *paddr = NULL; 731 732 switch (s->sa_family) { 733 case AF_INET: 734 paddr = &((struct sockaddr_in *)s)->sin_addr; 735 break; 736 case AF_INET6: 737 paddr = &((struct sockaddr_in6 *)s)->sin6_addr; 738 break; 739 } 740 741 if (paddr == NULL) 742 return (0); 743 744 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL) 745 return (0); 746 747 return (strlen(buf)); 748 } 749 750 int 751 rt_print(char *buf, int buflen, struct rtentry *rt) 752 { 753 struct sockaddr *addr, *mask; 754 int i = 0; 755 756 addr = rt_key(rt); 757 mask = rt_mask(rt); 758 759 i = p_sockaddr(buf, buflen, addr); 760 if (!(rt->rt_flags & RTF_HOST)) { 761 buf[i++] = '/'; 762 i += p_sockaddr(buf + i, buflen - i, mask); 763 } 764 765 if (rt->rt_flags & RTF_GATEWAY) { 766 buf[i++] = '>'; 767 i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa); 768 } 769 770 return (i); 771 } 772 #endif 773 774 #ifdef RADIX_MPATH 775 /* 776 * Deletes key for single-path routes, unlinks rtentry with 777 * gateway specified in @info from multi-path routes. 778 * 779 * Returnes unlinked entry. In case of failure, returns NULL 780 * and sets @perror to ESRCH. 781 */ 782 struct radix_node * 783 rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info, 784 struct rtentry *rto, int *perror) 785 { 786 /* 787 * if we got multipath routes, we require users to specify 788 * a matching RTAX_GATEWAY. 789 */ 790 struct rtentry *rt; // *rto = NULL; 791 struct radix_node *rn; 792 struct sockaddr *gw; 793 794 gw = info->rti_info[RTAX_GATEWAY]; 795 rt = rt_mpath_matchgate(rto, gw); 796 if (rt == NULL) { 797 *perror = ESRCH; 798 return (NULL); 799 } 800 801 /* 802 * this is the first entry in the chain 803 */ 804 if (rto == rt) { 805 rn = rn_mpath_next((struct radix_node *)rt); 806 /* 807 * there is another entry, now it's active 808 */ 809 if (rn) { 810 rto = RNTORT(rn); 811 rto->rte_flags |= RTF_UP; 812 } else if (rt->rte_flags & RTF_GATEWAY) { 813 /* 814 * For gateway routes, we need to 815 * make sure that we we are deleting 816 * the correct gateway. 817 * rt_mpath_matchgate() does not 818 * check the case when there is only 819 * one route in the chain. 820 */ 821 if (gw && 822 (rt->rt_nhop->gw_sa.sa_len != gw->sa_len || 823 memcmp(&rt->rt_nhop->gw_sa, gw, gw->sa_len))) { 824 *perror = ESRCH; 825 return (NULL); 826 } 827 } 828 829 /* 830 * use the normal delete code to remove 831 * the first entry 832 */ 833 rn = rnh->rnh_deladdr(info->rti_info[RTAX_DST], 834 info->rti_info[RTAX_NETMASK], 835 &rnh->head); 836 if (rn != NULL) { 837 *perror = 0; 838 } else { 839 *perror = ESRCH; 840 } 841 return (rn); 842 } 843 844 /* 845 * if the entry is 2nd and on up 846 */ 847 if (rt_mpath_deldup(rto, rt) == 0) 848 panic ("rtrequest1: rt_mpath_deldup"); 849 *perror = 0; 850 rn = (struct radix_node *)rt; 851 return (rn); 852 } 853 #endif 854 855 void 856 rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt) 857 { 858 859 if (info->rti_mflags & RTV_WEIGHT) 860 rt->rt_weight = info->rti_rmx->rmx_weight; 861 /* Kernel -> userland timebase conversion. */ 862 if (info->rti_mflags & RTV_EXPIRE) 863 rt->rt_expire = info->rti_rmx->rmx_expire ? 864 info->rti_rmx->rmx_expire - time_second + time_uptime : 0; 865 } 866 867 void 868 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask) 869 { 870 u_char *cp1 = (u_char *)src; 871 u_char *cp2 = (u_char *)dst; 872 u_char *cp3 = (u_char *)netmask; 873 u_char *cplim = cp2 + *cp3; 874 u_char *cplim2 = cp2 + *cp1; 875 876 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ 877 cp3 += 2; 878 if (cplim > cplim2) 879 cplim = cplim2; 880 while (cp2 < cplim) 881 *cp2++ = *cp1++ & *cp3++; 882 if (cp2 < cplim2) 883 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); 884 } 885 886 /* 887 * Set up a routing table entry, normally 888 * for an interface. 889 */ 890 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */ 891 static inline int 892 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum) 893 { 894 RIB_RLOCK_TRACKER; 895 struct epoch_tracker et; 896 struct sockaddr *dst; 897 struct sockaddr *netmask; 898 struct rib_cmd_info rc; 899 struct rt_addrinfo info; 900 int error = 0; 901 int startfib, endfib; 902 char tempbuf[_SOCKADDR_TMPSIZE]; 903 int didwork = 0; 904 int a_failure = 0; 905 struct sockaddr_dl_short *sdl = NULL; 906 struct rib_head *rnh; 907 908 if (flags & RTF_HOST) { 909 dst = ifa->ifa_dstaddr; 910 netmask = NULL; 911 } else { 912 dst = ifa->ifa_addr; 913 netmask = ifa->ifa_netmask; 914 } 915 if (dst->sa_len == 0) 916 return(EINVAL); 917 switch (dst->sa_family) { 918 case AF_INET6: 919 case AF_INET: 920 /* We support multiple FIBs. */ 921 break; 922 default: 923 fibnum = RT_DEFAULT_FIB; 924 break; 925 } 926 if (fibnum == RT_ALL_FIBS) { 927 if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD) 928 startfib = endfib = ifa->ifa_ifp->if_fib; 929 else { 930 startfib = 0; 931 endfib = rt_numfibs - 1; 932 } 933 } else { 934 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum")); 935 startfib = fibnum; 936 endfib = fibnum; 937 } 938 939 /* 940 * If it's a delete, check that if it exists, 941 * it's on the correct interface or we might scrub 942 * a route to another ifa which would 943 * be confusing at best and possibly worse. 944 */ 945 if (cmd == RTM_DELETE) { 946 /* 947 * It's a delete, so it should already exist.. 948 * If it's a net, mask off the host bits 949 * (Assuming we have a mask) 950 * XXX this is kinda inet specific.. 951 */ 952 if (netmask != NULL) { 953 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask); 954 dst = (struct sockaddr *)tempbuf; 955 } 956 } else if (cmd == RTM_ADD) { 957 sdl = (struct sockaddr_dl_short *)tempbuf; 958 bzero(sdl, sizeof(struct sockaddr_dl_short)); 959 sdl->sdl_family = AF_LINK; 960 sdl->sdl_len = sizeof(struct sockaddr_dl_short); 961 sdl->sdl_type = ifa->ifa_ifp->if_type; 962 sdl->sdl_index = ifa->ifa_ifp->if_index; 963 } 964 /* 965 * Now go through all the requested tables (fibs) and do the 966 * requested action. Realistically, this will either be fib 0 967 * for protocols that don't do multiple tables or all the 968 * tables for those that do. 969 */ 970 for ( fibnum = startfib; fibnum <= endfib; fibnum++) { 971 if (cmd == RTM_DELETE) { 972 struct radix_node *rn; 973 /* 974 * Look up an rtentry that is in the routing tree and 975 * contains the correct info. 976 */ 977 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 978 if (rnh == NULL) 979 /* this table doesn't exist but others might */ 980 continue; 981 RIB_RLOCK(rnh); 982 rn = rnh->rnh_lookup(dst, netmask, &rnh->head); 983 #ifdef RADIX_MPATH 984 if (rt_mpath_capable(rnh)) { 985 986 if (rn == NULL) 987 error = ESRCH; 988 else { 989 struct rtentry *rt = RNTORT(rn); 990 /* 991 * for interface route the gateway 992 * gateway is sockaddr_dl, so 993 * rt_mpath_matchgate must use the 994 * interface address 995 */ 996 rt = rt_mpath_matchgate(rt, 997 ifa->ifa_addr); 998 if (rt == NULL) 999 error = ESRCH; 1000 } 1001 } 1002 #endif 1003 error = (rn == NULL || 1004 (rn->rn_flags & RNF_ROOT) || 1005 RNTORT(rn)->rt_nhop->nh_ifa != ifa); 1006 RIB_RUNLOCK(rnh); 1007 if (error) { 1008 /* this is only an error if bad on ALL tables */ 1009 continue; 1010 } 1011 } 1012 /* 1013 * Do the actual request 1014 */ 1015 bzero((caddr_t)&info, sizeof(info)); 1016 info.rti_ifa = ifa; 1017 info.rti_flags = flags | 1018 (ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED; 1019 info.rti_info[RTAX_DST] = dst; 1020 /* 1021 * doing this for compatibility reasons 1022 */ 1023 if (cmd == RTM_ADD) 1024 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)sdl; 1025 else 1026 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 1027 info.rti_info[RTAX_NETMASK] = netmask; 1028 NET_EPOCH_ENTER(et); 1029 error = rib_action(fibnum, cmd, &info, &rc); 1030 if (error == 0 && rc.rc_rt != NULL) { 1031 /* 1032 * notify any listening routing agents of the change 1033 */ 1034 1035 /* TODO: interface routes/aliases */ 1036 rt_newaddrmsg_fib(cmd, ifa, rc.rc_rt, fibnum); 1037 didwork = 1; 1038 } 1039 NET_EPOCH_EXIT(et); 1040 if (error) 1041 a_failure = error; 1042 } 1043 if (cmd == RTM_DELETE) { 1044 if (didwork) { 1045 error = 0; 1046 } else { 1047 /* we only give an error if it wasn't in any table */ 1048 error = ((flags & RTF_HOST) ? 1049 EHOSTUNREACH : ENETUNREACH); 1050 } 1051 } else { 1052 if (a_failure) { 1053 /* return an error if any of them failed */ 1054 error = a_failure; 1055 } 1056 } 1057 return (error); 1058 } 1059 1060 /* 1061 * Set up a routing table entry, normally 1062 * for an interface. 1063 */ 1064 int 1065 rtinit(struct ifaddr *ifa, int cmd, int flags) 1066 { 1067 struct sockaddr *dst; 1068 int fib = RT_DEFAULT_FIB; 1069 1070 if (flags & RTF_HOST) { 1071 dst = ifa->ifa_dstaddr; 1072 } else { 1073 dst = ifa->ifa_addr; 1074 } 1075 1076 switch (dst->sa_family) { 1077 case AF_INET6: 1078 case AF_INET: 1079 /* We do support multiple FIBs. */ 1080 fib = RT_ALL_FIBS; 1081 break; 1082 } 1083 return (rtinit1(ifa, cmd, flags, fib)); 1084 } 1085 1086 /* 1087 * Announce interface address arrival/withdraw 1088 * Returns 0 on success. 1089 */ 1090 int 1091 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum) 1092 { 1093 1094 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1095 ("unexpected cmd %d", cmd)); 1096 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1097 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1098 1099 EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd); 1100 return (rtsock_addrmsg(cmd, ifa, fibnum)); 1101 } 1102 1103 /* 1104 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1105 * cmd: RTM_ cmd 1106 * @rt: valid rtentry 1107 * @ifp: target route interface 1108 * @fibnum: fib id or RT_ALL_FIBS 1109 * 1110 * Returns 0 on success. 1111 */ 1112 int 1113 rt_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs, 1114 int fibnum) 1115 { 1116 1117 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1118 ("unexpected cmd %d", cmd)); 1119 1120 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1121 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1122 1123 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__)); 1124 1125 return (rtsock_routemsg(cmd, rt, ifp, 0, fibnum)); 1126 } 1127 1128 /* 1129 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1130 * cmd: RTM_ cmd 1131 * @info: addrinfo structure with valid data. 1132 * @fibnum: fib id or RT_ALL_FIBS 1133 * 1134 * Returns 0 on success. 1135 */ 1136 int 1137 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum) 1138 { 1139 1140 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE, 1141 ("unexpected cmd %d", cmd)); 1142 1143 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1144 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1145 1146 KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__)); 1147 1148 return (rtsock_routemsg_info(cmd, info, fibnum)); 1149 } 1150 1151 1152 /* 1153 * This is called to generate messages from the routing socket 1154 * indicating a network interface has had addresses associated with it. 1155 */ 1156 void 1157 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, struct rtentry *rt, int fibnum) 1158 { 1159 1160 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1161 ("unexpected cmd %u", cmd)); 1162 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1163 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1164 1165 if (cmd == RTM_ADD) { 1166 rt_addrmsg(cmd, ifa, fibnum); 1167 if (rt != NULL) 1168 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1169 } else { 1170 if (rt != NULL) 1171 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1172 rt_addrmsg(cmd, ifa, fibnum); 1173 } 1174 } 1175 1176