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