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)); 217 218 /* Get the best ifa for the given interface and gateway. */ 219 if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL) 220 return (ENETUNREACH); 221 ifa_ref(ifa); 222 223 bzero(&info, sizeof(info)); 224 info.rti_info[RTAX_DST] = dst; 225 info.rti_info[RTAX_GATEWAY] = gateway; 226 info.rti_ifa = ifa; 227 info.rti_ifp = ifp; 228 info.rti_flags = flags | RTF_HOST | RTF_DYNAMIC; 229 230 /* Setup route metrics to define expire time. */ 231 bzero(&rti_rmx, sizeof(rti_rmx)); 232 /* Set expire time as absolute. */ 233 rti_rmx.rmx_expire = lifetime_sec + time_second; 234 info.rti_mflags |= RTV_EXPIRE; 235 info.rti_rmx = &rti_rmx; 236 237 error = rib_action(fibnum, RTM_ADD, &info, &rc); 238 ifa_free(ifa); 239 240 if (error != 0) { 241 /* TODO: add per-fib redirect stats. */ 242 return (error); 243 } 244 245 RT_LOCK(rc.rc_rt); 246 flags = rc.rc_rt->rt_flags; 247 RT_UNLOCK(rc.rc_rt); 248 249 RTSTAT_INC(rts_dynamic); 250 251 /* Send notification of a route addition to userland. */ 252 bzero(&info, sizeof(info)); 253 info.rti_info[RTAX_DST] = dst; 254 info.rti_info[RTAX_GATEWAY] = gateway; 255 info.rti_info[RTAX_AUTHOR] = author; 256 rt_missmsg_fib(RTM_REDIRECT, &info, flags, error, fibnum); 257 258 return (0); 259 } 260 261 /* 262 * Routing table ioctl interface. 263 */ 264 int 265 rtioctl_fib(u_long req, caddr_t data, u_int fibnum) 266 { 267 268 /* 269 * If more ioctl commands are added here, make sure the proper 270 * super-user checks are being performed because it is possible for 271 * prison-root to make it this far if raw sockets have been enabled 272 * in jails. 273 */ 274 #ifdef INET 275 /* Multicast goop, grrr... */ 276 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP; 277 #else /* INET */ 278 return ENXIO; 279 #endif /* INET */ 280 } 281 282 struct ifaddr * 283 ifa_ifwithroute(int flags, const struct sockaddr *dst, 284 const struct sockaddr *gateway, u_int fibnum) 285 { 286 struct ifaddr *ifa; 287 288 NET_EPOCH_ASSERT(); 289 if ((flags & RTF_GATEWAY) == 0) { 290 /* 291 * If we are adding a route to an interface, 292 * and the interface is a pt to pt link 293 * we should search for the destination 294 * as our clue to the interface. Otherwise 295 * we can use the local address. 296 */ 297 ifa = NULL; 298 if (flags & RTF_HOST) 299 ifa = ifa_ifwithdstaddr(dst, fibnum); 300 if (ifa == NULL) 301 ifa = ifa_ifwithaddr(gateway); 302 } else { 303 /* 304 * If we are adding a route to a remote net 305 * or host, the gateway may still be on the 306 * other end of a pt to pt link. 307 */ 308 ifa = ifa_ifwithdstaddr(gateway, fibnum); 309 } 310 if (ifa == NULL) 311 ifa = ifa_ifwithnet(gateway, 0, fibnum); 312 if (ifa == NULL) { 313 struct nhop_object *nh; 314 315 nh = rib_lookup(fibnum, gateway, NHR_NONE, 0); 316 317 /* 318 * dismiss a gateway that is reachable only 319 * through the default router 320 */ 321 if ((nh == NULL) || (nh->nh_flags & NHF_DEFAULT)) 322 return (NULL); 323 ifa = nh->nh_ifa; 324 } 325 if (ifa->ifa_addr->sa_family != dst->sa_family) { 326 struct ifaddr *oifa = ifa; 327 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); 328 if (ifa == NULL) 329 ifa = oifa; 330 } 331 332 return (ifa); 333 } 334 335 336 /* 337 * Copy most of @rt data into @info. 338 * 339 * If @flags contains NHR_COPY, copies dst,netmask and gw to the 340 * pointers specified by @info structure. Assume such pointers 341 * are zeroed sockaddr-like structures with sa_len field initialized 342 * to reflect size of the provided buffer. if no NHR_COPY is specified, 343 * point dst,netmask and gw @info fields to appropriate @rt values. 344 * 345 * if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa. 346 * 347 * Returns 0 on success. 348 */ 349 int 350 rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags) 351 { 352 struct rt_metrics *rmx; 353 struct sockaddr *src, *dst; 354 struct nhop_object *nh; 355 int sa_len; 356 357 if (flags & NHR_COPY) { 358 /* Copy destination if dst is non-zero */ 359 src = rt_key(rt); 360 dst = info->rti_info[RTAX_DST]; 361 sa_len = src->sa_len; 362 if (dst != NULL) { 363 if (src->sa_len > dst->sa_len) 364 return (ENOMEM); 365 memcpy(dst, src, src->sa_len); 366 info->rti_addrs |= RTA_DST; 367 } 368 369 /* Copy mask if set && dst is non-zero */ 370 src = rt_mask(rt); 371 dst = info->rti_info[RTAX_NETMASK]; 372 if (src != NULL && dst != NULL) { 373 374 /* 375 * Radix stores different value in sa_len, 376 * assume rt_mask() to have the same length 377 * as rt_key() 378 */ 379 if (sa_len > dst->sa_len) 380 return (ENOMEM); 381 memcpy(dst, src, src->sa_len); 382 info->rti_addrs |= RTA_NETMASK; 383 } 384 385 /* Copy gateway is set && dst is non-zero */ 386 src = &rt->rt_nhop->gw_sa; 387 dst = info->rti_info[RTAX_GATEWAY]; 388 if ((rt->rt_flags & RTF_GATEWAY) && src != NULL && dst != NULL){ 389 if (src->sa_len > dst->sa_len) 390 return (ENOMEM); 391 memcpy(dst, src, src->sa_len); 392 info->rti_addrs |= RTA_GATEWAY; 393 } 394 } else { 395 info->rti_info[RTAX_DST] = rt_key(rt); 396 info->rti_addrs |= RTA_DST; 397 if (rt_mask(rt) != NULL) { 398 info->rti_info[RTAX_NETMASK] = rt_mask(rt); 399 info->rti_addrs |= RTA_NETMASK; 400 } 401 if (rt->rt_flags & RTF_GATEWAY) { 402 info->rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa; 403 info->rti_addrs |= RTA_GATEWAY; 404 } 405 } 406 407 nh = rt->rt_nhop; 408 rmx = info->rti_rmx; 409 if (rmx != NULL) { 410 info->rti_mflags |= RTV_MTU; 411 rmx->rmx_mtu = nh->nh_mtu; 412 } 413 414 info->rti_flags = rt->rt_flags | nhop_get_rtflags(nh); 415 info->rti_ifp = nh->nh_ifp; 416 info->rti_ifa = nh->nh_ifa; 417 if (flags & NHR_REF) { 418 if_ref(info->rti_ifp); 419 ifa_ref(info->rti_ifa); 420 } 421 422 return (0); 423 } 424 425 /* 426 * Lookups up route entry for @dst in RIB database for fib @fibnum. 427 * Exports entry data to @info using rt_exportinfo(). 428 * 429 * If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa. 430 * All references can be released later by calling rib_free_info(). 431 * 432 * Returns 0 on success. 433 * Returns ENOENT for lookup failure, ENOMEM for export failure. 434 */ 435 int 436 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags, 437 uint32_t flowid, struct rt_addrinfo *info) 438 { 439 RIB_RLOCK_TRACKER; 440 struct rib_head *rh; 441 struct radix_node *rn; 442 struct rtentry *rt; 443 int error; 444 445 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum")); 446 rh = rt_tables_get_rnh(fibnum, dst->sa_family); 447 if (rh == NULL) 448 return (ENOENT); 449 450 RIB_RLOCK(rh); 451 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head); 452 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 453 rt = RNTORT(rn); 454 /* Ensure route & ifp is UP */ 455 if (RT_LINK_IS_UP(rt->rt_nhop->nh_ifp)) { 456 flags = (flags & NHR_REF) | NHR_COPY; 457 error = rt_exportinfo(rt, info, flags); 458 RIB_RUNLOCK(rh); 459 460 return (error); 461 } 462 } 463 RIB_RUNLOCK(rh); 464 465 return (ENOENT); 466 } 467 468 /* 469 * Releases all references acquired by rib_lookup_info() when 470 * called with NHR_REF flags. 471 */ 472 void 473 rib_free_info(struct rt_addrinfo *info) 474 { 475 476 ifa_free(info->rti_ifa); 477 if_rele(info->rti_ifp); 478 } 479 480 /* 481 * Iterates over all existing fibs in system calling 482 * @setwa_f function prior to traversing each fib. 483 * Calls @wa_f function for each element in current fib. 484 * If af is not AF_UNSPEC, iterates over fibs in particular 485 * address family. 486 */ 487 void 488 rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f, 489 void *arg) 490 { 491 struct rib_head *rnh; 492 uint32_t fibnum; 493 int i; 494 495 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 496 /* Do we want some specific family? */ 497 if (af != AF_UNSPEC) { 498 rnh = rt_tables_get_rnh(fibnum, af); 499 if (rnh == NULL) 500 continue; 501 if (setwa_f != NULL) 502 setwa_f(rnh, fibnum, af, arg); 503 504 RIB_WLOCK(rnh); 505 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 506 RIB_WUNLOCK(rnh); 507 continue; 508 } 509 510 for (i = 1; i <= AF_MAX; i++) { 511 rnh = rt_tables_get_rnh(fibnum, i); 512 if (rnh == NULL) 513 continue; 514 if (setwa_f != NULL) 515 setwa_f(rnh, fibnum, i, arg); 516 517 RIB_WLOCK(rnh); 518 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 519 RIB_WUNLOCK(rnh); 520 } 521 } 522 } 523 524 /* 525 * Iterates over all existing fibs in system and deletes each element 526 * for which @filter_f function returns non-zero value. 527 * If @family is not AF_UNSPEC, iterates over fibs in particular 528 * address family. 529 */ 530 void 531 rt_foreach_fib_walk_del(int family, rt_filter_f_t *filter_f, void *arg) 532 { 533 u_int fibnum; 534 int i, start, end; 535 536 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 537 /* Do we want some specific family? */ 538 if (family != AF_UNSPEC) { 539 start = family; 540 end = family; 541 } else { 542 start = 1; 543 end = AF_MAX; 544 } 545 546 for (i = start; i <= end; i++) { 547 if (rt_tables_get_rnh(fibnum, i) == NULL) 548 continue; 549 550 rib_walk_del(fibnum, i, filter_f, arg, 0); 551 } 552 } 553 } 554 555 /* 556 * Delete Routes for a Network Interface 557 * 558 * Called for each routing entry via the rnh->rnh_walktree() call above 559 * to delete all route entries referencing a detaching network interface. 560 * 561 * Arguments: 562 * rt pointer to rtentry 563 * nh pointer to nhop 564 * arg argument passed to rnh->rnh_walktree() - detaching interface 565 * 566 * Returns: 567 * 0 successful 568 * errno failed - reason indicated 569 */ 570 static int 571 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg) 572 { 573 struct ifnet *ifp = arg; 574 575 if (nh->nh_ifp != ifp) 576 return (0); 577 578 /* 579 * Protect (sorta) against walktree recursion problems 580 * with cloned routes 581 */ 582 if ((rt->rt_flags & RTF_UP) == 0) 583 return (0); 584 585 return (1); 586 } 587 588 /* 589 * Delete all remaining routes using this interface 590 * Unfortuneatly the only way to do this is to slog through 591 * the entire routing table looking for routes which point 592 * to this interface...oh well... 593 */ 594 void 595 rt_flushifroutes_af(struct ifnet *ifp, int af) 596 { 597 KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d", 598 __func__, af, AF_MAX)); 599 600 rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp); 601 } 602 603 void 604 rt_flushifroutes(struct ifnet *ifp) 605 { 606 607 rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp); 608 } 609 610 /* 611 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined, 612 * it will be referenced so the caller must free it. 613 * 614 * Assume basic consistency checks are executed by callers: 615 * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well. 616 */ 617 int 618 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum) 619 { 620 const struct sockaddr *dst, *gateway, *ifpaddr, *ifaaddr; 621 struct epoch_tracker et; 622 int needref, error, flags; 623 624 dst = info->rti_info[RTAX_DST]; 625 gateway = info->rti_info[RTAX_GATEWAY]; 626 ifpaddr = info->rti_info[RTAX_IFP]; 627 ifaaddr = info->rti_info[RTAX_IFA]; 628 flags = info->rti_flags; 629 630 /* 631 * ifp may be specified by sockaddr_dl 632 * when protocol address is ambiguous. 633 */ 634 error = 0; 635 needref = (info->rti_ifa == NULL); 636 NET_EPOCH_ENTER(et); 637 638 /* If we have interface specified by the ifindex in the address, use it */ 639 if (info->rti_ifp == NULL && ifpaddr != NULL && 640 ifpaddr->sa_family == AF_LINK) { 641 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)ifpaddr; 642 if (sdl->sdl_index != 0) 643 info->rti_ifp = ifnet_byindex(sdl->sdl_index); 644 } 645 /* 646 * If we have source address specified, try to find it 647 * TODO: avoid enumerating all ifas on all interfaces. 648 */ 649 if (info->rti_ifa == NULL && ifaaddr != NULL) 650 info->rti_ifa = ifa_ifwithaddr(ifaaddr); 651 if (info->rti_ifa == NULL) { 652 const struct sockaddr *sa; 653 654 /* 655 * Most common use case for the userland-supplied routes. 656 * 657 * Choose sockaddr to select ifa. 658 * -- if ifp is set -- 659 * Order of preference: 660 * 1) IFA address 661 * 2) gateway address 662 * Note: for interface routes link-level gateway address 663 * is specified to indicate the interface index without 664 * specifying RTF_GATEWAY. In this case, ignore gateway 665 * Note: gateway AF may be different from dst AF. In this case, 666 * ignore gateway 667 * 3) final destination. 668 * 4) if all of these fails, try to get at least link-level ifa. 669 * -- else -- 670 * try to lookup gateway or dst in the routing table to get ifa 671 */ 672 if (info->rti_info[RTAX_IFA] != NULL) 673 sa = info->rti_info[RTAX_IFA]; 674 else if ((info->rti_flags & RTF_GATEWAY) != 0 && 675 gateway->sa_family == dst->sa_family) 676 sa = gateway; 677 else 678 sa = dst; 679 if (info->rti_ifp != NULL) { 680 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); 681 /* Case 4 */ 682 if (info->rti_ifa == NULL && gateway != NULL) 683 info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp); 684 } else if (dst != NULL && gateway != NULL) 685 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway, 686 fibnum); 687 else if (sa != NULL) 688 info->rti_ifa = ifa_ifwithroute(flags, sa, sa, 689 fibnum); 690 } 691 if (needref && info->rti_ifa != NULL) { 692 if (info->rti_ifp == NULL) 693 info->rti_ifp = info->rti_ifa->ifa_ifp; 694 ifa_ref(info->rti_ifa); 695 } else 696 error = ENETUNREACH; 697 NET_EPOCH_EXIT(et); 698 return (error); 699 } 700 701 void 702 rt_updatemtu(struct ifnet *ifp) 703 { 704 struct rib_head *rnh; 705 int mtu; 706 int i, j; 707 708 /* 709 * Try to update rt_mtu for all routes using this interface 710 * Unfortunately the only way to do this is to traverse all 711 * routing tables in all fibs/domains. 712 */ 713 for (i = 1; i <= AF_MAX; i++) { 714 mtu = if_getmtu_family(ifp, i); 715 for (j = 0; j < rt_numfibs; j++) { 716 rnh = rt_tables_get_rnh(j, i); 717 if (rnh == NULL) 718 continue; 719 nhops_update_ifmtu(rnh, ifp, mtu); 720 } 721 } 722 } 723 724 725 #if 0 726 int p_sockaddr(char *buf, int buflen, struct sockaddr *s); 727 int rt_print(char *buf, int buflen, struct rtentry *rt); 728 729 int 730 p_sockaddr(char *buf, int buflen, struct sockaddr *s) 731 { 732 void *paddr = NULL; 733 734 switch (s->sa_family) { 735 case AF_INET: 736 paddr = &((struct sockaddr_in *)s)->sin_addr; 737 break; 738 case AF_INET6: 739 paddr = &((struct sockaddr_in6 *)s)->sin6_addr; 740 break; 741 } 742 743 if (paddr == NULL) 744 return (0); 745 746 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL) 747 return (0); 748 749 return (strlen(buf)); 750 } 751 752 int 753 rt_print(char *buf, int buflen, struct rtentry *rt) 754 { 755 struct sockaddr *addr, *mask; 756 int i = 0; 757 758 addr = rt_key(rt); 759 mask = rt_mask(rt); 760 761 i = p_sockaddr(buf, buflen, addr); 762 if (!(rt->rt_flags & RTF_HOST)) { 763 buf[i++] = '/'; 764 i += p_sockaddr(buf + i, buflen - i, mask); 765 } 766 767 if (rt->rt_flags & RTF_GATEWAY) { 768 buf[i++] = '>'; 769 i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa); 770 } 771 772 return (i); 773 } 774 #endif 775 776 #ifdef RADIX_MPATH 777 /* 778 * Deletes key for single-path routes, unlinks rtentry with 779 * gateway specified in @info from multi-path routes. 780 * 781 * Returnes unlinked entry. In case of failure, returns NULL 782 * and sets @perror to ESRCH. 783 */ 784 struct radix_node * 785 rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info, 786 struct rtentry *rto, int *perror) 787 { 788 /* 789 * if we got multipath routes, we require users to specify 790 * a matching RTAX_GATEWAY. 791 */ 792 struct rtentry *rt; // *rto = NULL; 793 struct radix_node *rn; 794 struct sockaddr *gw; 795 796 gw = info->rti_info[RTAX_GATEWAY]; 797 rt = rt_mpath_matchgate(rto, gw); 798 if (rt == NULL) { 799 *perror = ESRCH; 800 return (NULL); 801 } 802 803 /* 804 * this is the first entry in the chain 805 */ 806 if (rto == rt) { 807 rn = rn_mpath_next((struct radix_node *)rt); 808 /* 809 * there is another entry, now it's active 810 */ 811 if (rn) { 812 rto = RNTORT(rn); 813 RT_LOCK(rto); 814 rto->rt_flags |= RTF_UP; 815 RT_UNLOCK(rto); 816 } else if (rt->rt_flags & RTF_GATEWAY) { 817 /* 818 * For gateway routes, we need to 819 * make sure that we we are deleting 820 * the correct gateway. 821 * rt_mpath_matchgate() does not 822 * check the case when there is only 823 * one route in the chain. 824 */ 825 if (gw && 826 (rt->rt_nhop->gw_sa.sa_len != gw->sa_len || 827 memcmp(&rt->rt_nhop->gw_sa, gw, gw->sa_len))) { 828 *perror = ESRCH; 829 return (NULL); 830 } 831 } 832 833 /* 834 * use the normal delete code to remove 835 * the first entry 836 */ 837 rn = rnh->rnh_deladdr(info->rti_info[RTAX_DST], 838 info->rti_info[RTAX_NETMASK], 839 &rnh->head); 840 if (rn != NULL) { 841 *perror = 0; 842 } else { 843 *perror = ESRCH; 844 } 845 return (rn); 846 } 847 848 /* 849 * if the entry is 2nd and on up 850 */ 851 if (rt_mpath_deldup(rto, rt) == 0) 852 panic ("rtrequest1: rt_mpath_deldup"); 853 *perror = 0; 854 rn = (struct radix_node *)rt; 855 return (rn); 856 } 857 #endif 858 859 void 860 rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt) 861 { 862 863 if (info->rti_mflags & RTV_WEIGHT) 864 rt->rt_weight = info->rti_rmx->rmx_weight; 865 /* Kernel -> userland timebase conversion. */ 866 if (info->rti_mflags & RTV_EXPIRE) 867 rt->rt_expire = info->rti_rmx->rmx_expire ? 868 info->rti_rmx->rmx_expire - time_second + time_uptime : 0; 869 } 870 871 void 872 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask) 873 { 874 u_char *cp1 = (u_char *)src; 875 u_char *cp2 = (u_char *)dst; 876 u_char *cp3 = (u_char *)netmask; 877 u_char *cplim = cp2 + *cp3; 878 u_char *cplim2 = cp2 + *cp1; 879 880 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ 881 cp3 += 2; 882 if (cplim > cplim2) 883 cplim = cplim2; 884 while (cp2 < cplim) 885 *cp2++ = *cp1++ & *cp3++; 886 if (cp2 < cplim2) 887 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); 888 } 889 890 /* 891 * Set up a routing table entry, normally 892 * for an interface. 893 */ 894 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */ 895 static inline int 896 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum) 897 { 898 RIB_RLOCK_TRACKER; 899 struct epoch_tracker et; 900 struct sockaddr *dst; 901 struct sockaddr *netmask; 902 struct rib_cmd_info rc; 903 struct rt_addrinfo info; 904 int error = 0; 905 int startfib, endfib; 906 char tempbuf[_SOCKADDR_TMPSIZE]; 907 int didwork = 0; 908 int a_failure = 0; 909 struct sockaddr_dl_short *sdl = NULL; 910 struct rib_head *rnh; 911 912 if (flags & RTF_HOST) { 913 dst = ifa->ifa_dstaddr; 914 netmask = NULL; 915 } else { 916 dst = ifa->ifa_addr; 917 netmask = ifa->ifa_netmask; 918 } 919 if (dst->sa_len == 0) 920 return(EINVAL); 921 switch (dst->sa_family) { 922 case AF_INET6: 923 case AF_INET: 924 /* We support multiple FIBs. */ 925 break; 926 default: 927 fibnum = RT_DEFAULT_FIB; 928 break; 929 } 930 if (fibnum == RT_ALL_FIBS) { 931 if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD) 932 startfib = endfib = ifa->ifa_ifp->if_fib; 933 else { 934 startfib = 0; 935 endfib = rt_numfibs - 1; 936 } 937 } else { 938 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum")); 939 startfib = fibnum; 940 endfib = fibnum; 941 } 942 943 /* 944 * If it's a delete, check that if it exists, 945 * it's on the correct interface or we might scrub 946 * a route to another ifa which would 947 * be confusing at best and possibly worse. 948 */ 949 if (cmd == RTM_DELETE) { 950 /* 951 * It's a delete, so it should already exist.. 952 * If it's a net, mask off the host bits 953 * (Assuming we have a mask) 954 * XXX this is kinda inet specific.. 955 */ 956 if (netmask != NULL) { 957 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask); 958 dst = (struct sockaddr *)tempbuf; 959 } 960 } else if (cmd == RTM_ADD) { 961 sdl = (struct sockaddr_dl_short *)tempbuf; 962 bzero(sdl, sizeof(struct sockaddr_dl_short)); 963 sdl->sdl_family = AF_LINK; 964 sdl->sdl_len = sizeof(struct sockaddr_dl_short); 965 sdl->sdl_type = ifa->ifa_ifp->if_type; 966 sdl->sdl_index = ifa->ifa_ifp->if_index; 967 } 968 /* 969 * Now go through all the requested tables (fibs) and do the 970 * requested action. Realistically, this will either be fib 0 971 * for protocols that don't do multiple tables or all the 972 * tables for those that do. 973 */ 974 for ( fibnum = startfib; fibnum <= endfib; fibnum++) { 975 if (cmd == RTM_DELETE) { 976 struct radix_node *rn; 977 /* 978 * Look up an rtentry that is in the routing tree and 979 * contains the correct info. 980 */ 981 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 982 if (rnh == NULL) 983 /* this table doesn't exist but others might */ 984 continue; 985 RIB_RLOCK(rnh); 986 rn = rnh->rnh_lookup(dst, netmask, &rnh->head); 987 #ifdef RADIX_MPATH 988 if (rt_mpath_capable(rnh)) { 989 990 if (rn == NULL) 991 error = ESRCH; 992 else { 993 struct rtentry *rt = RNTORT(rn); 994 /* 995 * for interface route the gateway 996 * gateway is sockaddr_dl, so 997 * rt_mpath_matchgate must use the 998 * interface address 999 */ 1000 rt = rt_mpath_matchgate(rt, 1001 ifa->ifa_addr); 1002 if (rt == NULL) 1003 error = ESRCH; 1004 } 1005 } 1006 #endif 1007 error = (rn == NULL || 1008 (rn->rn_flags & RNF_ROOT) || 1009 RNTORT(rn)->rt_nhop->nh_ifa != ifa); 1010 RIB_RUNLOCK(rnh); 1011 if (error) { 1012 /* this is only an error if bad on ALL tables */ 1013 continue; 1014 } 1015 } 1016 /* 1017 * Do the actual request 1018 */ 1019 bzero((caddr_t)&info, sizeof(info)); 1020 info.rti_ifa = ifa; 1021 info.rti_flags = flags | 1022 (ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED; 1023 info.rti_info[RTAX_DST] = dst; 1024 /* 1025 * doing this for compatibility reasons 1026 */ 1027 if (cmd == RTM_ADD) 1028 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)sdl; 1029 else 1030 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 1031 info.rti_info[RTAX_NETMASK] = netmask; 1032 NET_EPOCH_ENTER(et); 1033 error = rib_action(fibnum, cmd, &info, &rc); 1034 if (error == 0 && rc.rc_rt != NULL) { 1035 /* 1036 * notify any listening routing agents of the change 1037 */ 1038 1039 /* TODO: interface routes/aliases */ 1040 rt_newaddrmsg_fib(cmd, ifa, rc.rc_rt, fibnum); 1041 didwork = 1; 1042 } 1043 NET_EPOCH_EXIT(et); 1044 if (error) 1045 a_failure = error; 1046 } 1047 if (cmd == RTM_DELETE) { 1048 if (didwork) { 1049 error = 0; 1050 } else { 1051 /* we only give an error if it wasn't in any table */ 1052 error = ((flags & RTF_HOST) ? 1053 EHOSTUNREACH : ENETUNREACH); 1054 } 1055 } else { 1056 if (a_failure) { 1057 /* return an error if any of them failed */ 1058 error = a_failure; 1059 } 1060 } 1061 return (error); 1062 } 1063 1064 /* 1065 * Set up a routing table entry, normally 1066 * for an interface. 1067 */ 1068 int 1069 rtinit(struct ifaddr *ifa, int cmd, int flags) 1070 { 1071 struct sockaddr *dst; 1072 int fib = RT_DEFAULT_FIB; 1073 1074 if (flags & RTF_HOST) { 1075 dst = ifa->ifa_dstaddr; 1076 } else { 1077 dst = ifa->ifa_addr; 1078 } 1079 1080 switch (dst->sa_family) { 1081 case AF_INET6: 1082 case AF_INET: 1083 /* We do support multiple FIBs. */ 1084 fib = RT_ALL_FIBS; 1085 break; 1086 } 1087 return (rtinit1(ifa, cmd, flags, fib)); 1088 } 1089 1090 /* 1091 * Announce interface address arrival/withdraw 1092 * Returns 0 on success. 1093 */ 1094 int 1095 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum) 1096 { 1097 1098 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1099 ("unexpected cmd %d", cmd)); 1100 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1101 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1102 1103 EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd); 1104 return (rtsock_addrmsg(cmd, ifa, fibnum)); 1105 } 1106 1107 /* 1108 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1109 * cmd: RTM_ cmd 1110 * @rt: valid rtentry 1111 * @ifp: target route interface 1112 * @fibnum: fib id or RT_ALL_FIBS 1113 * 1114 * Returns 0 on success. 1115 */ 1116 int 1117 rt_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs, 1118 int fibnum) 1119 { 1120 1121 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1122 ("unexpected cmd %d", cmd)); 1123 1124 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1125 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1126 1127 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__)); 1128 1129 return (rtsock_routemsg(cmd, rt, ifp, 0, fibnum)); 1130 } 1131 1132 /* 1133 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1134 * cmd: RTM_ cmd 1135 * @info: addrinfo structure with valid data. 1136 * @fibnum: fib id or RT_ALL_FIBS 1137 * 1138 * Returns 0 on success. 1139 */ 1140 int 1141 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum) 1142 { 1143 1144 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE, 1145 ("unexpected cmd %d", cmd)); 1146 1147 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1148 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1149 1150 KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__)); 1151 1152 return (rtsock_routemsg_info(cmd, info, fibnum)); 1153 } 1154 1155 1156 /* 1157 * This is called to generate messages from the routing socket 1158 * indicating a network interface has had addresses associated with it. 1159 */ 1160 void 1161 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, struct rtentry *rt, int fibnum) 1162 { 1163 1164 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1165 ("unexpected cmd %u", cmd)); 1166 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1167 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1168 1169 if (cmd == RTM_ADD) { 1170 rt_addrmsg(cmd, ifa, fibnum); 1171 if (rt != NULL) 1172 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1173 } else { 1174 if (rt != NULL) 1175 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1176 rt_addrmsg(cmd, ifa, fibnum); 1177 } 1178 } 1179 1180