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->rte_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 nh = rt->rt_nhop; 358 if (flags & NHR_COPY) { 359 /* Copy destination if dst is non-zero */ 360 src = rt_key(rt); 361 dst = info->rti_info[RTAX_DST]; 362 sa_len = src->sa_len; 363 if (dst != NULL) { 364 if (src->sa_len > dst->sa_len) 365 return (ENOMEM); 366 memcpy(dst, src, src->sa_len); 367 info->rti_addrs |= RTA_DST; 368 } 369 370 /* Copy mask if set && dst is non-zero */ 371 src = rt_mask(rt); 372 dst = info->rti_info[RTAX_NETMASK]; 373 if (src != NULL && dst != NULL) { 374 375 /* 376 * Radix stores different value in sa_len, 377 * assume rt_mask() to have the same length 378 * as rt_key() 379 */ 380 if (sa_len > dst->sa_len) 381 return (ENOMEM); 382 memcpy(dst, src, src->sa_len); 383 info->rti_addrs |= RTA_NETMASK; 384 } 385 386 /* Copy gateway is set && dst is non-zero */ 387 src = &nh->gw_sa; 388 dst = info->rti_info[RTAX_GATEWAY]; 389 if ((nhop_get_rtflags(nh) & RTF_GATEWAY) && 390 src != NULL && dst != NULL) { 391 if (src->sa_len > dst->sa_len) 392 return (ENOMEM); 393 memcpy(dst, src, src->sa_len); 394 info->rti_addrs |= RTA_GATEWAY; 395 } 396 } else { 397 info->rti_info[RTAX_DST] = rt_key(rt); 398 info->rti_addrs |= RTA_DST; 399 if (rt_mask(rt) != NULL) { 400 info->rti_info[RTAX_NETMASK] = rt_mask(rt); 401 info->rti_addrs |= RTA_NETMASK; 402 } 403 if (nhop_get_rtflags(nh) & RTF_GATEWAY) { 404 info->rti_info[RTAX_GATEWAY] = &nh->gw_sa; 405 info->rti_addrs |= RTA_GATEWAY; 406 } 407 } 408 409 rmx = info->rti_rmx; 410 if (rmx != NULL) { 411 info->rti_mflags |= RTV_MTU; 412 rmx->rmx_mtu = nh->nh_mtu; 413 } 414 415 info->rti_flags = rt->rte_flags | nhop_get_rtflags(nh); 416 info->rti_ifp = nh->nh_ifp; 417 info->rti_ifa = nh->nh_ifa; 418 if (flags & NHR_REF) { 419 if_ref(info->rti_ifp); 420 ifa_ref(info->rti_ifa); 421 } 422 423 return (0); 424 } 425 426 /* 427 * Lookups up route entry for @dst in RIB database for fib @fibnum. 428 * Exports entry data to @info using rt_exportinfo(). 429 * 430 * If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa. 431 * All references can be released later by calling rib_free_info(). 432 * 433 * Returns 0 on success. 434 * Returns ENOENT for lookup failure, ENOMEM for export failure. 435 */ 436 int 437 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags, 438 uint32_t flowid, struct rt_addrinfo *info) 439 { 440 RIB_RLOCK_TRACKER; 441 struct rib_head *rh; 442 struct radix_node *rn; 443 struct rtentry *rt; 444 int error; 445 446 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum")); 447 rh = rt_tables_get_rnh(fibnum, dst->sa_family); 448 if (rh == NULL) 449 return (ENOENT); 450 451 RIB_RLOCK(rh); 452 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head); 453 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 454 rt = RNTORT(rn); 455 /* Ensure route & ifp is UP */ 456 if (RT_LINK_IS_UP(rt->rt_nhop->nh_ifp)) { 457 flags = (flags & NHR_REF) | NHR_COPY; 458 error = rt_exportinfo(rt, info, flags); 459 RIB_RUNLOCK(rh); 460 461 return (error); 462 } 463 } 464 RIB_RUNLOCK(rh); 465 466 return (ENOENT); 467 } 468 469 /* 470 * Releases all references acquired by rib_lookup_info() when 471 * called with NHR_REF flags. 472 */ 473 void 474 rib_free_info(struct rt_addrinfo *info) 475 { 476 477 ifa_free(info->rti_ifa); 478 if_rele(info->rti_ifp); 479 } 480 481 /* 482 * Iterates over all existing fibs in system calling 483 * @setwa_f function prior to traversing each fib. 484 * Calls @wa_f function for each element in current fib. 485 * If af is not AF_UNSPEC, iterates over fibs in particular 486 * address family. 487 */ 488 void 489 rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f, 490 void *arg) 491 { 492 struct rib_head *rnh; 493 uint32_t fibnum; 494 int i; 495 496 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 497 /* Do we want some specific family? */ 498 if (af != AF_UNSPEC) { 499 rnh = rt_tables_get_rnh(fibnum, af); 500 if (rnh == NULL) 501 continue; 502 if (setwa_f != NULL) 503 setwa_f(rnh, fibnum, af, arg); 504 505 RIB_WLOCK(rnh); 506 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 507 RIB_WUNLOCK(rnh); 508 continue; 509 } 510 511 for (i = 1; i <= AF_MAX; i++) { 512 rnh = rt_tables_get_rnh(fibnum, i); 513 if (rnh == NULL) 514 continue; 515 if (setwa_f != NULL) 516 setwa_f(rnh, fibnum, i, arg); 517 518 RIB_WLOCK(rnh); 519 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 520 RIB_WUNLOCK(rnh); 521 } 522 } 523 } 524 525 /* 526 * Iterates over all existing fibs in system and deletes each element 527 * for which @filter_f function returns non-zero value. 528 * If @family is not AF_UNSPEC, iterates over fibs in particular 529 * address family. 530 */ 531 void 532 rt_foreach_fib_walk_del(int family, rt_filter_f_t *filter_f, void *arg) 533 { 534 u_int fibnum; 535 int i, start, end; 536 537 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 538 /* Do we want some specific family? */ 539 if (family != AF_UNSPEC) { 540 start = family; 541 end = family; 542 } else { 543 start = 1; 544 end = AF_MAX; 545 } 546 547 for (i = start; i <= end; i++) { 548 if (rt_tables_get_rnh(fibnum, i) == NULL) 549 continue; 550 551 rib_walk_del(fibnum, i, filter_f, arg, 0); 552 } 553 } 554 } 555 556 /* 557 * Delete Routes for a Network Interface 558 * 559 * Called for each routing entry via the rnh->rnh_walktree() call above 560 * to delete all route entries referencing a detaching network interface. 561 * 562 * Arguments: 563 * rt pointer to rtentry 564 * nh pointer to nhop 565 * arg argument passed to rnh->rnh_walktree() - detaching interface 566 * 567 * Returns: 568 * 0 successful 569 * errno failed - reason indicated 570 */ 571 static int 572 rt_ifdelroute(const struct rtentry *rt, const struct nhop_object *nh, void *arg) 573 { 574 struct ifnet *ifp = arg; 575 576 if (nh->nh_ifp != ifp) 577 return (0); 578 579 /* 580 * Protect (sorta) against walktree recursion problems 581 * with cloned routes 582 */ 583 if ((rt->rte_flags & RTF_UP) == 0) 584 return (0); 585 586 return (1); 587 } 588 589 /* 590 * Delete all remaining routes using this interface 591 * Unfortuneatly the only way to do this is to slog through 592 * the entire routing table looking for routes which point 593 * to this interface...oh well... 594 */ 595 void 596 rt_flushifroutes_af(struct ifnet *ifp, int af) 597 { 598 KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d", 599 __func__, af, AF_MAX)); 600 601 rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp); 602 } 603 604 void 605 rt_flushifroutes(struct ifnet *ifp) 606 { 607 608 rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp); 609 } 610 611 /* 612 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined, 613 * it will be referenced so the caller must free it. 614 * 615 * Assume basic consistency checks are executed by callers: 616 * RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well. 617 */ 618 int 619 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum) 620 { 621 const struct sockaddr *dst, *gateway, *ifpaddr, *ifaaddr; 622 struct epoch_tracker et; 623 int needref, error, flags; 624 625 dst = info->rti_info[RTAX_DST]; 626 gateway = info->rti_info[RTAX_GATEWAY]; 627 ifpaddr = info->rti_info[RTAX_IFP]; 628 ifaaddr = info->rti_info[RTAX_IFA]; 629 flags = info->rti_flags; 630 631 /* 632 * ifp may be specified by sockaddr_dl 633 * when protocol address is ambiguous. 634 */ 635 error = 0; 636 needref = (info->rti_ifa == NULL); 637 NET_EPOCH_ENTER(et); 638 639 /* If we have interface specified by the ifindex in the address, use it */ 640 if (info->rti_ifp == NULL && ifpaddr != NULL && 641 ifpaddr->sa_family == AF_LINK) { 642 const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)ifpaddr; 643 if (sdl->sdl_index != 0) 644 info->rti_ifp = ifnet_byindex(sdl->sdl_index); 645 } 646 /* 647 * If we have source address specified, try to find it 648 * TODO: avoid enumerating all ifas on all interfaces. 649 */ 650 if (info->rti_ifa == NULL && ifaaddr != NULL) 651 info->rti_ifa = ifa_ifwithaddr(ifaaddr); 652 if (info->rti_ifa == NULL) { 653 const struct sockaddr *sa; 654 655 /* 656 * Most common use case for the userland-supplied routes. 657 * 658 * Choose sockaddr to select ifa. 659 * -- if ifp is set -- 660 * Order of preference: 661 * 1) IFA address 662 * 2) gateway address 663 * Note: for interface routes link-level gateway address 664 * is specified to indicate the interface index without 665 * specifying RTF_GATEWAY. In this case, ignore gateway 666 * Note: gateway AF may be different from dst AF. In this case, 667 * ignore gateway 668 * 3) final destination. 669 * 4) if all of these fails, try to get at least link-level ifa. 670 * -- else -- 671 * try to lookup gateway or dst in the routing table to get ifa 672 */ 673 if (info->rti_info[RTAX_IFA] != NULL) 674 sa = info->rti_info[RTAX_IFA]; 675 else if ((info->rti_flags & RTF_GATEWAY) != 0 && 676 gateway->sa_family == dst->sa_family) 677 sa = gateway; 678 else 679 sa = dst; 680 if (info->rti_ifp != NULL) { 681 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); 682 /* Case 4 */ 683 if (info->rti_ifa == NULL && gateway != NULL) 684 info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp); 685 } else if (dst != NULL && gateway != NULL) 686 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway, 687 fibnum); 688 else if (sa != NULL) 689 info->rti_ifa = ifa_ifwithroute(flags, sa, sa, 690 fibnum); 691 } 692 if (needref && info->rti_ifa != NULL) { 693 if (info->rti_ifp == NULL) 694 info->rti_ifp = info->rti_ifa->ifa_ifp; 695 ifa_ref(info->rti_ifa); 696 } else 697 error = ENETUNREACH; 698 NET_EPOCH_EXIT(et); 699 return (error); 700 } 701 702 void 703 rt_updatemtu(struct ifnet *ifp) 704 { 705 struct rib_head *rnh; 706 int mtu; 707 int i, j; 708 709 /* 710 * Try to update rt_mtu for all routes using this interface 711 * Unfortunately the only way to do this is to traverse all 712 * routing tables in all fibs/domains. 713 */ 714 for (i = 1; i <= AF_MAX; i++) { 715 mtu = if_getmtu_family(ifp, i); 716 for (j = 0; j < rt_numfibs; j++) { 717 rnh = rt_tables_get_rnh(j, i); 718 if (rnh == NULL) 719 continue; 720 nhops_update_ifmtu(rnh, ifp, mtu); 721 } 722 } 723 } 724 725 726 #if 0 727 int p_sockaddr(char *buf, int buflen, struct sockaddr *s); 728 int rt_print(char *buf, int buflen, struct rtentry *rt); 729 730 int 731 p_sockaddr(char *buf, int buflen, struct sockaddr *s) 732 { 733 void *paddr = NULL; 734 735 switch (s->sa_family) { 736 case AF_INET: 737 paddr = &((struct sockaddr_in *)s)->sin_addr; 738 break; 739 case AF_INET6: 740 paddr = &((struct sockaddr_in6 *)s)->sin6_addr; 741 break; 742 } 743 744 if (paddr == NULL) 745 return (0); 746 747 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL) 748 return (0); 749 750 return (strlen(buf)); 751 } 752 753 int 754 rt_print(char *buf, int buflen, struct rtentry *rt) 755 { 756 struct sockaddr *addr, *mask; 757 int i = 0; 758 759 addr = rt_key(rt); 760 mask = rt_mask(rt); 761 762 i = p_sockaddr(buf, buflen, addr); 763 if (!(rt->rt_flags & RTF_HOST)) { 764 buf[i++] = '/'; 765 i += p_sockaddr(buf + i, buflen - i, mask); 766 } 767 768 if (rt->rt_flags & RTF_GATEWAY) { 769 buf[i++] = '>'; 770 i += p_sockaddr(buf + i, buflen - i, &rt->rt_nhop->gw_sa); 771 } 772 773 return (i); 774 } 775 #endif 776 777 #ifdef RADIX_MPATH 778 /* 779 * Deletes key for single-path routes, unlinks rtentry with 780 * gateway specified in @info from multi-path routes. 781 * 782 * Returnes unlinked entry. In case of failure, returns NULL 783 * and sets @perror to ESRCH. 784 */ 785 struct radix_node * 786 rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info, 787 struct rtentry *rto, int *perror) 788 { 789 /* 790 * if we got multipath routes, we require users to specify 791 * a matching RTAX_GATEWAY. 792 */ 793 struct rtentry *rt; // *rto = NULL; 794 struct radix_node *rn; 795 struct sockaddr *gw; 796 797 gw = info->rti_info[RTAX_GATEWAY]; 798 rt = rt_mpath_matchgate(rto, gw); 799 if (rt == NULL) { 800 *perror = ESRCH; 801 return (NULL); 802 } 803 804 /* 805 * this is the first entry in the chain 806 */ 807 if (rto == rt) { 808 rn = rn_mpath_next((struct radix_node *)rt); 809 /* 810 * there is another entry, now it's active 811 */ 812 if (rn) { 813 rto = RNTORT(rn); 814 RT_LOCK(rto); 815 rto->rte_flags |= RTF_UP; 816 RT_UNLOCK(rto); 817 } else if (rt->rte_flags & RTF_GATEWAY) { 818 /* 819 * For gateway routes, we need to 820 * make sure that we we are deleting 821 * the correct gateway. 822 * rt_mpath_matchgate() does not 823 * check the case when there is only 824 * one route in the chain. 825 */ 826 if (gw && 827 (rt->rt_nhop->gw_sa.sa_len != gw->sa_len || 828 memcmp(&rt->rt_nhop->gw_sa, gw, gw->sa_len))) { 829 *perror = ESRCH; 830 return (NULL); 831 } 832 } 833 834 /* 835 * use the normal delete code to remove 836 * the first entry 837 */ 838 rn = rnh->rnh_deladdr(info->rti_info[RTAX_DST], 839 info->rti_info[RTAX_NETMASK], 840 &rnh->head); 841 if (rn != NULL) { 842 *perror = 0; 843 } else { 844 *perror = ESRCH; 845 } 846 return (rn); 847 } 848 849 /* 850 * if the entry is 2nd and on up 851 */ 852 if (rt_mpath_deldup(rto, rt) == 0) 853 panic ("rtrequest1: rt_mpath_deldup"); 854 *perror = 0; 855 rn = (struct radix_node *)rt; 856 return (rn); 857 } 858 #endif 859 860 void 861 rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt) 862 { 863 864 if (info->rti_mflags & RTV_WEIGHT) 865 rt->rt_weight = info->rti_rmx->rmx_weight; 866 /* Kernel -> userland timebase conversion. */ 867 if (info->rti_mflags & RTV_EXPIRE) 868 rt->rt_expire = info->rti_rmx->rmx_expire ? 869 info->rti_rmx->rmx_expire - time_second + time_uptime : 0; 870 } 871 872 void 873 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask) 874 { 875 u_char *cp1 = (u_char *)src; 876 u_char *cp2 = (u_char *)dst; 877 u_char *cp3 = (u_char *)netmask; 878 u_char *cplim = cp2 + *cp3; 879 u_char *cplim2 = cp2 + *cp1; 880 881 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ 882 cp3 += 2; 883 if (cplim > cplim2) 884 cplim = cplim2; 885 while (cp2 < cplim) 886 *cp2++ = *cp1++ & *cp3++; 887 if (cp2 < cplim2) 888 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); 889 } 890 891 /* 892 * Set up a routing table entry, normally 893 * for an interface. 894 */ 895 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */ 896 static inline int 897 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum) 898 { 899 RIB_RLOCK_TRACKER; 900 struct epoch_tracker et; 901 struct sockaddr *dst; 902 struct sockaddr *netmask; 903 struct rib_cmd_info rc; 904 struct rt_addrinfo info; 905 int error = 0; 906 int startfib, endfib; 907 char tempbuf[_SOCKADDR_TMPSIZE]; 908 int didwork = 0; 909 int a_failure = 0; 910 struct sockaddr_dl_short *sdl = NULL; 911 struct rib_head *rnh; 912 913 if (flags & RTF_HOST) { 914 dst = ifa->ifa_dstaddr; 915 netmask = NULL; 916 } else { 917 dst = ifa->ifa_addr; 918 netmask = ifa->ifa_netmask; 919 } 920 if (dst->sa_len == 0) 921 return(EINVAL); 922 switch (dst->sa_family) { 923 case AF_INET6: 924 case AF_INET: 925 /* We support multiple FIBs. */ 926 break; 927 default: 928 fibnum = RT_DEFAULT_FIB; 929 break; 930 } 931 if (fibnum == RT_ALL_FIBS) { 932 if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD) 933 startfib = endfib = ifa->ifa_ifp->if_fib; 934 else { 935 startfib = 0; 936 endfib = rt_numfibs - 1; 937 } 938 } else { 939 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum")); 940 startfib = fibnum; 941 endfib = fibnum; 942 } 943 944 /* 945 * If it's a delete, check that if it exists, 946 * it's on the correct interface or we might scrub 947 * a route to another ifa which would 948 * be confusing at best and possibly worse. 949 */ 950 if (cmd == RTM_DELETE) { 951 /* 952 * It's a delete, so it should already exist.. 953 * If it's a net, mask off the host bits 954 * (Assuming we have a mask) 955 * XXX this is kinda inet specific.. 956 */ 957 if (netmask != NULL) { 958 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask); 959 dst = (struct sockaddr *)tempbuf; 960 } 961 } else if (cmd == RTM_ADD) { 962 sdl = (struct sockaddr_dl_short *)tempbuf; 963 bzero(sdl, sizeof(struct sockaddr_dl_short)); 964 sdl->sdl_family = AF_LINK; 965 sdl->sdl_len = sizeof(struct sockaddr_dl_short); 966 sdl->sdl_type = ifa->ifa_ifp->if_type; 967 sdl->sdl_index = ifa->ifa_ifp->if_index; 968 } 969 /* 970 * Now go through all the requested tables (fibs) and do the 971 * requested action. Realistically, this will either be fib 0 972 * for protocols that don't do multiple tables or all the 973 * tables for those that do. 974 */ 975 for ( fibnum = startfib; fibnum <= endfib; fibnum++) { 976 if (cmd == RTM_DELETE) { 977 struct radix_node *rn; 978 /* 979 * Look up an rtentry that is in the routing tree and 980 * contains the correct info. 981 */ 982 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 983 if (rnh == NULL) 984 /* this table doesn't exist but others might */ 985 continue; 986 RIB_RLOCK(rnh); 987 rn = rnh->rnh_lookup(dst, netmask, &rnh->head); 988 #ifdef RADIX_MPATH 989 if (rt_mpath_capable(rnh)) { 990 991 if (rn == NULL) 992 error = ESRCH; 993 else { 994 struct rtentry *rt = RNTORT(rn); 995 /* 996 * for interface route the gateway 997 * gateway is sockaddr_dl, so 998 * rt_mpath_matchgate must use the 999 * interface address 1000 */ 1001 rt = rt_mpath_matchgate(rt, 1002 ifa->ifa_addr); 1003 if (rt == NULL) 1004 error = ESRCH; 1005 } 1006 } 1007 #endif 1008 error = (rn == NULL || 1009 (rn->rn_flags & RNF_ROOT) || 1010 RNTORT(rn)->rt_nhop->nh_ifa != ifa); 1011 RIB_RUNLOCK(rnh); 1012 if (error) { 1013 /* this is only an error if bad on ALL tables */ 1014 continue; 1015 } 1016 } 1017 /* 1018 * Do the actual request 1019 */ 1020 bzero((caddr_t)&info, sizeof(info)); 1021 info.rti_ifa = ifa; 1022 info.rti_flags = flags | 1023 (ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED; 1024 info.rti_info[RTAX_DST] = dst; 1025 /* 1026 * doing this for compatibility reasons 1027 */ 1028 if (cmd == RTM_ADD) 1029 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)sdl; 1030 else 1031 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 1032 info.rti_info[RTAX_NETMASK] = netmask; 1033 NET_EPOCH_ENTER(et); 1034 error = rib_action(fibnum, cmd, &info, &rc); 1035 if (error == 0 && rc.rc_rt != NULL) { 1036 /* 1037 * notify any listening routing agents of the change 1038 */ 1039 1040 /* TODO: interface routes/aliases */ 1041 rt_newaddrmsg_fib(cmd, ifa, rc.rc_rt, fibnum); 1042 didwork = 1; 1043 } 1044 NET_EPOCH_EXIT(et); 1045 if (error) 1046 a_failure = error; 1047 } 1048 if (cmd == RTM_DELETE) { 1049 if (didwork) { 1050 error = 0; 1051 } else { 1052 /* we only give an error if it wasn't in any table */ 1053 error = ((flags & RTF_HOST) ? 1054 EHOSTUNREACH : ENETUNREACH); 1055 } 1056 } else { 1057 if (a_failure) { 1058 /* return an error if any of them failed */ 1059 error = a_failure; 1060 } 1061 } 1062 return (error); 1063 } 1064 1065 /* 1066 * Set up a routing table entry, normally 1067 * for an interface. 1068 */ 1069 int 1070 rtinit(struct ifaddr *ifa, int cmd, int flags) 1071 { 1072 struct sockaddr *dst; 1073 int fib = RT_DEFAULT_FIB; 1074 1075 if (flags & RTF_HOST) { 1076 dst = ifa->ifa_dstaddr; 1077 } else { 1078 dst = ifa->ifa_addr; 1079 } 1080 1081 switch (dst->sa_family) { 1082 case AF_INET6: 1083 case AF_INET: 1084 /* We do support multiple FIBs. */ 1085 fib = RT_ALL_FIBS; 1086 break; 1087 } 1088 return (rtinit1(ifa, cmd, flags, fib)); 1089 } 1090 1091 /* 1092 * Announce interface address arrival/withdraw 1093 * Returns 0 on success. 1094 */ 1095 int 1096 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum) 1097 { 1098 1099 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1100 ("unexpected cmd %d", cmd)); 1101 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1102 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1103 1104 EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd); 1105 return (rtsock_addrmsg(cmd, ifa, fibnum)); 1106 } 1107 1108 /* 1109 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1110 * cmd: RTM_ cmd 1111 * @rt: valid rtentry 1112 * @ifp: target route interface 1113 * @fibnum: fib id or RT_ALL_FIBS 1114 * 1115 * Returns 0 on success. 1116 */ 1117 int 1118 rt_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs, 1119 int fibnum) 1120 { 1121 1122 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1123 ("unexpected cmd %d", cmd)); 1124 1125 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1126 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1127 1128 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__)); 1129 1130 return (rtsock_routemsg(cmd, rt, ifp, 0, fibnum)); 1131 } 1132 1133 /* 1134 * Announce kernel-originated route addition/removal to rtsock based on @rt data. 1135 * cmd: RTM_ cmd 1136 * @info: addrinfo structure with valid data. 1137 * @fibnum: fib id or RT_ALL_FIBS 1138 * 1139 * Returns 0 on success. 1140 */ 1141 int 1142 rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum) 1143 { 1144 1145 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE, 1146 ("unexpected cmd %d", cmd)); 1147 1148 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1149 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1150 1151 KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__)); 1152 1153 return (rtsock_routemsg_info(cmd, info, fibnum)); 1154 } 1155 1156 1157 /* 1158 * This is called to generate messages from the routing socket 1159 * indicating a network interface has had addresses associated with it. 1160 */ 1161 void 1162 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, struct rtentry *rt, int fibnum) 1163 { 1164 1165 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 1166 ("unexpected cmd %u", cmd)); 1167 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 1168 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 1169 1170 if (cmd == RTM_ADD) { 1171 rt_addrmsg(cmd, ifa, fibnum); 1172 if (rt != NULL) 1173 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1174 } else { 1175 if (rt != NULL) 1176 rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum); 1177 rt_addrmsg(cmd, ifa, fibnum); 1178 } 1179 } 1180 1181