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_route.h" 42 #include "opt_sctp.h" 43 #include "opt_mrouting.h" 44 #include "opt_mpath.h" 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/malloc.h> 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #include <sys/sysctl.h> 52 #include <sys/syslog.h> 53 #include <sys/sysproto.h> 54 #include <sys/proc.h> 55 #include <sys/domain.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_var.h> 65 #include <net/vnet.h> 66 67 #ifdef RADIX_MPATH 68 #include <net/radix_mpath.h> 69 #endif 70 71 #include <netinet/in.h> 72 #include <netinet/ip_mroute.h> 73 74 #include <vm/uma.h> 75 76 #define RT_MAXFIBS UINT16_MAX 77 78 /* Kernel config default option. */ 79 #ifdef ROUTETABLES 80 #if ROUTETABLES <= 0 81 #error "ROUTETABLES defined too low" 82 #endif 83 #if ROUTETABLES > RT_MAXFIBS 84 #error "ROUTETABLES defined too big" 85 #endif 86 #define RT_NUMFIBS ROUTETABLES 87 #endif /* ROUTETABLES */ 88 /* Initialize to default if not otherwise set. */ 89 #ifndef RT_NUMFIBS 90 #define RT_NUMFIBS 1 91 #endif 92 93 #if defined(INET) || defined(INET6) 94 #ifdef SCTP 95 extern void sctp_addr_change(struct ifaddr *ifa, int cmd); 96 #endif /* SCTP */ 97 #endif 98 99 100 /* This is read-only.. */ 101 u_int rt_numfibs = RT_NUMFIBS; 102 SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RDTUN, &rt_numfibs, 0, ""); 103 104 /* 105 * By default add routes to all fibs for new interfaces. 106 * Once this is set to 0 then only allocate routes on interface 107 * changes for the FIB of the caller when adding a new set of addresses 108 * to an interface. XXX this is a shotgun aproach to a problem that needs 109 * a more fine grained solution.. that will come. 110 * XXX also has the problems getting the FIB from curthread which will not 111 * always work given the fib can be overridden and prefixes can be added 112 * from the network stack context. 113 */ 114 VNET_DEFINE(u_int, rt_add_addr_allfibs) = 1; 115 SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET, 116 &VNET_NAME(rt_add_addr_allfibs), 0, ""); 117 118 VNET_DEFINE(struct rtstat, rtstat); 119 #define V_rtstat VNET(rtstat) 120 121 VNET_DEFINE(struct rib_head *, rt_tables); 122 #define V_rt_tables VNET(rt_tables) 123 124 VNET_DEFINE(int, rttrash); /* routes not in table but not freed */ 125 #define V_rttrash VNET(rttrash) 126 127 128 /* 129 * Convert a 'struct radix_node *' to a 'struct rtentry *'. 130 * The operation can be done safely (in this code) because a 131 * 'struct rtentry' starts with two 'struct radix_node''s, the first 132 * one representing leaf nodes in the routing tree, which is 133 * what the code in radix.c passes us as a 'struct radix_node'. 134 * 135 * But because there are a lot of assumptions in this conversion, 136 * do not cast explicitly, but always use the macro below. 137 */ 138 #define RNTORT(p) ((struct rtentry *)(p)) 139 140 VNET_DEFINE_STATIC(uma_zone_t, rtzone); /* Routing table UMA zone. */ 141 #define V_rtzone VNET(rtzone) 142 143 static int rtrequest1_fib_change(struct rib_head *, struct rt_addrinfo *, 144 struct rtentry **, u_int); 145 static void rt_setmetrics(const struct rt_addrinfo *, struct rtentry *); 146 static int rt_ifdelroute(const struct rtentry *rt, void *arg); 147 static struct rtentry *rt_unlinkrte(struct rib_head *rnh, 148 struct rt_addrinfo *info, int *perror); 149 static void rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info); 150 #ifdef RADIX_MPATH 151 static struct radix_node *rt_mpath_unlink(struct rib_head *rnh, 152 struct rt_addrinfo *info, struct rtentry *rto, int *perror); 153 #endif 154 static int rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, 155 int flags); 156 157 struct if_mtuinfo 158 { 159 struct ifnet *ifp; 160 int mtu; 161 }; 162 163 static int if_updatemtu_cb(struct radix_node *, void *); 164 165 /* 166 * handler for net.my_fibnum 167 */ 168 static int 169 sysctl_my_fibnum(SYSCTL_HANDLER_ARGS) 170 { 171 int fibnum; 172 int error; 173 174 fibnum = curthread->td_proc->p_fibnum; 175 error = sysctl_handle_int(oidp, &fibnum, 0, req); 176 return (error); 177 } 178 179 SYSCTL_PROC(_net, OID_AUTO, my_fibnum, CTLTYPE_INT|CTLFLAG_RD, 180 NULL, 0, &sysctl_my_fibnum, "I", "default FIB of caller"); 181 182 static __inline struct rib_head ** 183 rt_tables_get_rnh_ptr(int table, int fam) 184 { 185 struct rib_head **rnh; 186 187 KASSERT(table >= 0 && table < rt_numfibs, ("%s: table out of bounds.", 188 __func__)); 189 KASSERT(fam >= 0 && fam < (AF_MAX+1), ("%s: fam out of bounds.", 190 __func__)); 191 192 /* rnh is [fib=0][af=0]. */ 193 rnh = (struct rib_head **)V_rt_tables; 194 /* Get the offset to the requested table and fam. */ 195 rnh += table * (AF_MAX+1) + fam; 196 197 return (rnh); 198 } 199 200 struct rib_head * 201 rt_tables_get_rnh(int table, int fam) 202 { 203 204 return (*rt_tables_get_rnh_ptr(table, fam)); 205 } 206 207 u_int 208 rt_tables_get_gen(int table, int fam) 209 { 210 struct rib_head *rnh; 211 212 rnh = *rt_tables_get_rnh_ptr(table, fam); 213 KASSERT(rnh != NULL, ("%s: NULL rib_head pointer table %d fam %d", 214 __func__, table, fam)); 215 return (rnh->rnh_gen); 216 } 217 218 219 /* 220 * route initialization must occur before ip6_init2(), which happenas at 221 * SI_ORDER_MIDDLE. 222 */ 223 static void 224 route_init(void) 225 { 226 227 /* whack the tunable ints into line. */ 228 if (rt_numfibs > RT_MAXFIBS) 229 rt_numfibs = RT_MAXFIBS; 230 if (rt_numfibs == 0) 231 rt_numfibs = 1; 232 } 233 SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, NULL); 234 235 static int 236 rtentry_zinit(void *mem, int size, int how) 237 { 238 struct rtentry *rt = mem; 239 240 rt->rt_pksent = counter_u64_alloc(how); 241 if (rt->rt_pksent == NULL) 242 return (ENOMEM); 243 244 RT_LOCK_INIT(rt); 245 246 return (0); 247 } 248 249 static void 250 rtentry_zfini(void *mem, int size) 251 { 252 struct rtentry *rt = mem; 253 254 RT_LOCK_DESTROY(rt); 255 counter_u64_free(rt->rt_pksent); 256 } 257 258 static int 259 rtentry_ctor(void *mem, int size, void *arg, int how) 260 { 261 struct rtentry *rt = mem; 262 263 bzero(rt, offsetof(struct rtentry, rt_endzero)); 264 counter_u64_zero(rt->rt_pksent); 265 rt->rt_chain = NULL; 266 267 return (0); 268 } 269 270 static void 271 rtentry_dtor(void *mem, int size, void *arg) 272 { 273 struct rtentry *rt = mem; 274 275 RT_UNLOCK_COND(rt); 276 } 277 278 static void 279 vnet_route_init(const void *unused __unused) 280 { 281 struct domain *dom; 282 struct rib_head **rnh; 283 int table; 284 int fam; 285 286 V_rt_tables = malloc(rt_numfibs * (AF_MAX+1) * 287 sizeof(struct rib_head *), M_RTABLE, M_WAITOK|M_ZERO); 288 289 V_rtzone = uma_zcreate("rtentry", sizeof(struct rtentry), 290 rtentry_ctor, rtentry_dtor, 291 rtentry_zinit, rtentry_zfini, UMA_ALIGN_PTR, 0); 292 for (dom = domains; dom; dom = dom->dom_next) { 293 if (dom->dom_rtattach == NULL) 294 continue; 295 296 for (table = 0; table < rt_numfibs; table++) { 297 fam = dom->dom_family; 298 if (table != 0 && fam != AF_INET6 && fam != AF_INET) 299 break; 300 301 rnh = rt_tables_get_rnh_ptr(table, fam); 302 if (rnh == NULL) 303 panic("%s: rnh NULL", __func__); 304 dom->dom_rtattach((void **)rnh, 0); 305 } 306 } 307 } 308 VNET_SYSINIT(vnet_route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 309 vnet_route_init, 0); 310 311 #ifdef VIMAGE 312 static void 313 vnet_route_uninit(const void *unused __unused) 314 { 315 int table; 316 int fam; 317 struct domain *dom; 318 struct rib_head **rnh; 319 320 for (dom = domains; dom; dom = dom->dom_next) { 321 if (dom->dom_rtdetach == NULL) 322 continue; 323 324 for (table = 0; table < rt_numfibs; table++) { 325 fam = dom->dom_family; 326 327 if (table != 0 && fam != AF_INET6 && fam != AF_INET) 328 break; 329 330 rnh = rt_tables_get_rnh_ptr(table, fam); 331 if (rnh == NULL) 332 panic("%s: rnh NULL", __func__); 333 dom->dom_rtdetach((void **)rnh, 0); 334 } 335 } 336 337 free(V_rt_tables, M_RTABLE); 338 uma_zdestroy(V_rtzone); 339 } 340 VNET_SYSUNINIT(vnet_route_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, 341 vnet_route_uninit, 0); 342 #endif 343 344 struct rib_head * 345 rt_table_init(int offset) 346 { 347 struct rib_head *rh; 348 349 rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO); 350 351 /* TODO: These details should be hidded inside radix.c */ 352 /* Init masks tree */ 353 rn_inithead_internal(&rh->head, rh->rnh_nodes, offset); 354 rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0); 355 rh->head.rnh_masks = &rh->rmhead; 356 357 /* Init locks */ 358 RIB_LOCK_INIT(rh); 359 360 /* Finally, set base callbacks */ 361 rh->rnh_addaddr = rn_addroute; 362 rh->rnh_deladdr = rn_delete; 363 rh->rnh_matchaddr = rn_match; 364 rh->rnh_lookup = rn_lookup; 365 rh->rnh_walktree = rn_walktree; 366 rh->rnh_walktree_from = rn_walktree_from; 367 368 return (rh); 369 } 370 371 static int 372 rt_freeentry(struct radix_node *rn, void *arg) 373 { 374 struct radix_head * const rnh = arg; 375 struct radix_node *x; 376 377 x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh); 378 if (x != NULL) 379 R_Free(x); 380 return (0); 381 } 382 383 void 384 rt_table_destroy(struct rib_head *rh) 385 { 386 387 rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head); 388 389 /* Assume table is already empty */ 390 RIB_LOCK_DESTROY(rh); 391 free(rh, M_RTABLE); 392 } 393 394 395 #ifndef _SYS_SYSPROTO_H_ 396 struct setfib_args { 397 int fibnum; 398 }; 399 #endif 400 int 401 sys_setfib(struct thread *td, struct setfib_args *uap) 402 { 403 if (uap->fibnum < 0 || uap->fibnum >= rt_numfibs) 404 return EINVAL; 405 td->td_proc->p_fibnum = uap->fibnum; 406 return (0); 407 } 408 409 /* 410 * Packet routing routines. 411 */ 412 void 413 rtalloc_ign_fib(struct route *ro, u_long ignore, u_int fibnum) 414 { 415 struct rtentry *rt; 416 417 if ((rt = ro->ro_rt) != NULL) { 418 if (rt->rt_ifp != NULL && rt->rt_flags & RTF_UP) 419 return; 420 RTFREE(rt); 421 ro->ro_rt = NULL; 422 } 423 ro->ro_rt = rtalloc1_fib(&ro->ro_dst, 1, ignore, fibnum); 424 if (ro->ro_rt) 425 RT_UNLOCK(ro->ro_rt); 426 } 427 428 /* 429 * Look up the route that matches the address given 430 * Or, at least try.. Create a cloned route if needed. 431 * 432 * The returned route, if any, is locked. 433 */ 434 struct rtentry * 435 rtalloc1(struct sockaddr *dst, int report, u_long ignflags) 436 { 437 438 return (rtalloc1_fib(dst, report, ignflags, RT_DEFAULT_FIB)); 439 } 440 441 struct rtentry * 442 rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags, 443 u_int fibnum) 444 { 445 RIB_RLOCK_TRACKER; 446 struct rib_head *rh; 447 struct radix_node *rn; 448 struct rtentry *newrt; 449 struct rt_addrinfo info; 450 int err = 0, msgtype = RTM_MISS; 451 452 KASSERT((fibnum < rt_numfibs), ("rtalloc1_fib: bad fibnum")); 453 rh = rt_tables_get_rnh(fibnum, dst->sa_family); 454 newrt = NULL; 455 if (rh == NULL) 456 goto miss; 457 458 /* 459 * Look up the address in the table for that Address Family 460 */ 461 if ((ignflags & RTF_RNH_LOCKED) == 0) 462 RIB_RLOCK(rh); 463 #ifdef INVARIANTS 464 else 465 RIB_LOCK_ASSERT(rh); 466 #endif 467 rn = rh->rnh_matchaddr(dst, &rh->head); 468 if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) { 469 newrt = RNTORT(rn); 470 RT_LOCK(newrt); 471 RT_ADDREF(newrt); 472 if ((ignflags & RTF_RNH_LOCKED) == 0) 473 RIB_RUNLOCK(rh); 474 return (newrt); 475 476 } else if ((ignflags & RTF_RNH_LOCKED) == 0) 477 RIB_RUNLOCK(rh); 478 /* 479 * Either we hit the root or could not find any match, 480 * which basically means: "cannot get there from here". 481 */ 482 miss: 483 V_rtstat.rts_unreach++; 484 485 if (report) { 486 /* 487 * If required, report the failure to the supervising 488 * Authorities. 489 * For a delete, this is not an error. (report == 0) 490 */ 491 bzero(&info, sizeof(info)); 492 info.rti_info[RTAX_DST] = dst; 493 rt_missmsg_fib(msgtype, &info, 0, err, fibnum); 494 } 495 return (newrt); 496 } 497 498 /* 499 * Remove a reference count from an rtentry. 500 * If the count gets low enough, take it out of the routing table 501 */ 502 void 503 rtfree(struct rtentry *rt) 504 { 505 struct rib_head *rnh; 506 507 KASSERT(rt != NULL,("%s: NULL rt", __func__)); 508 rnh = rt_tables_get_rnh(rt->rt_fibnum, rt_key(rt)->sa_family); 509 KASSERT(rnh != NULL,("%s: NULL rnh", __func__)); 510 511 RT_LOCK_ASSERT(rt); 512 513 /* 514 * The callers should use RTFREE_LOCKED() or RTFREE(), so 515 * we should come here exactly with the last reference. 516 */ 517 RT_REMREF(rt); 518 if (rt->rt_refcnt > 0) { 519 log(LOG_DEBUG, "%s: %p has %d refs\n", __func__, rt, rt->rt_refcnt); 520 goto done; 521 } 522 523 /* 524 * On last reference give the "close method" a chance 525 * to cleanup private state. This also permits (for 526 * IPv4 and IPv6) a chance to decide if the routing table 527 * entry should be purged immediately or at a later time. 528 * When an immediate purge is to happen the close routine 529 * typically calls rtexpunge which clears the RTF_UP flag 530 * on the entry so that the code below reclaims the storage. 531 */ 532 if (rt->rt_refcnt == 0 && rnh->rnh_close) 533 rnh->rnh_close((struct radix_node *)rt, &rnh->head); 534 535 /* 536 * If we are no longer "up" (and ref == 0) 537 * then we can free the resources associated 538 * with the route. 539 */ 540 if ((rt->rt_flags & RTF_UP) == 0) { 541 if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT)) 542 panic("rtfree 2"); 543 /* 544 * the rtentry must have been removed from the routing table 545 * so it is represented in rttrash.. remove that now. 546 */ 547 V_rttrash--; 548 #ifdef DIAGNOSTIC 549 if (rt->rt_refcnt < 0) { 550 printf("rtfree: %p not freed (neg refs)\n", rt); 551 goto done; 552 } 553 #endif 554 /* 555 * release references on items we hold them on.. 556 * e.g other routes and ifaddrs. 557 */ 558 if (rt->rt_ifa) 559 ifa_free(rt->rt_ifa); 560 /* 561 * The key is separatly alloc'd so free it (see rt_setgate()). 562 * This also frees the gateway, as they are always malloc'd 563 * together. 564 */ 565 R_Free(rt_key(rt)); 566 567 /* 568 * and the rtentry itself of course 569 */ 570 uma_zfree(V_rtzone, rt); 571 return; 572 } 573 done: 574 RT_UNLOCK(rt); 575 } 576 577 578 /* 579 * Force a routing table entry to the specified 580 * destination to go through the given gateway. 581 * Normally called as a result of a routing redirect 582 * message from the network layer. 583 */ 584 void 585 rtredirect_fib(struct sockaddr *dst, 586 struct sockaddr *gateway, 587 struct sockaddr *netmask, 588 int flags, 589 struct sockaddr *src, 590 u_int fibnum) 591 { 592 struct rtentry *rt; 593 int error = 0; 594 short *stat = NULL; 595 struct rt_addrinfo info; 596 struct epoch_tracker et; 597 struct ifaddr *ifa; 598 struct rib_head *rnh; 599 600 ifa = NULL; 601 NET_EPOCH_ENTER(et); 602 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 603 if (rnh == NULL) { 604 error = EAFNOSUPPORT; 605 goto out; 606 } 607 /* verify the gateway is directly reachable */ 608 if ((ifa = ifa_ifwithnet(gateway, 0, fibnum)) == NULL) { 609 error = ENETUNREACH; 610 goto out; 611 } 612 rt = rtalloc1_fib(dst, 0, 0UL, fibnum); /* NB: rt is locked */ 613 /* 614 * If the redirect isn't from our current router for this dst, 615 * it's either old or wrong. If it redirects us to ourselves, 616 * we have a routing loop, perhaps as a result of an interface 617 * going down recently. 618 */ 619 if (!(flags & RTF_DONE) && rt) { 620 if (!sa_equal(src, rt->rt_gateway)) { 621 error = EINVAL; 622 goto done; 623 } 624 if (rt->rt_ifa != ifa && ifa->ifa_addr->sa_family != AF_LINK) { 625 error = EINVAL; 626 goto done; 627 } 628 } 629 if ((flags & RTF_GATEWAY) && ifa_ifwithaddr_check(gateway)) { 630 error = EHOSTUNREACH; 631 goto done; 632 } 633 /* 634 * Create a new entry if we just got back a wildcard entry 635 * or the lookup failed. This is necessary for hosts 636 * which use routing redirects generated by smart gateways 637 * to dynamically build the routing tables. 638 */ 639 if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2)) 640 goto create; 641 /* 642 * Don't listen to the redirect if it's 643 * for a route to an interface. 644 */ 645 if (rt->rt_flags & RTF_GATEWAY) { 646 if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) { 647 /* 648 * Changing from route to net => route to host. 649 * Create new route, rather than smashing route to net. 650 */ 651 create: 652 if (rt != NULL) 653 RTFREE_LOCKED(rt); 654 655 flags |= RTF_DYNAMIC; 656 bzero((caddr_t)&info, sizeof(info)); 657 info.rti_info[RTAX_DST] = dst; 658 info.rti_info[RTAX_GATEWAY] = gateway; 659 info.rti_info[RTAX_NETMASK] = netmask; 660 ifa_ref(ifa); 661 info.rti_ifa = ifa; 662 info.rti_flags = flags; 663 error = rtrequest1_fib(RTM_ADD, &info, &rt, fibnum); 664 if (rt != NULL) { 665 RT_LOCK(rt); 666 flags = rt->rt_flags; 667 } 668 669 stat = &V_rtstat.rts_dynamic; 670 } else { 671 672 /* 673 * Smash the current notion of the gateway to 674 * this destination. Should check about netmask!!! 675 */ 676 if ((flags & RTF_GATEWAY) == 0) 677 rt->rt_flags &= ~RTF_GATEWAY; 678 rt->rt_flags |= RTF_MODIFIED; 679 flags |= RTF_MODIFIED; 680 stat = &V_rtstat.rts_newgateway; 681 /* 682 * add the key and gateway (in one malloc'd chunk). 683 */ 684 RT_UNLOCK(rt); 685 RIB_WLOCK(rnh); 686 RT_LOCK(rt); 687 rt_setgate(rt, rt_key(rt), gateway); 688 RIB_WUNLOCK(rnh); 689 } 690 } else 691 error = EHOSTUNREACH; 692 done: 693 if (rt) 694 RTFREE_LOCKED(rt); 695 out: 696 NET_EPOCH_EXIT(et); 697 if (error) 698 V_rtstat.rts_badredirect++; 699 else if (stat != NULL) 700 (*stat)++; 701 bzero((caddr_t)&info, sizeof(info)); 702 info.rti_info[RTAX_DST] = dst; 703 info.rti_info[RTAX_GATEWAY] = gateway; 704 info.rti_info[RTAX_NETMASK] = netmask; 705 info.rti_info[RTAX_AUTHOR] = src; 706 rt_missmsg_fib(RTM_REDIRECT, &info, flags, error, fibnum); 707 } 708 709 /* 710 * Routing table ioctl interface. 711 */ 712 int 713 rtioctl_fib(u_long req, caddr_t data, u_int fibnum) 714 { 715 716 /* 717 * If more ioctl commands are added here, make sure the proper 718 * super-user checks are being performed because it is possible for 719 * prison-root to make it this far if raw sockets have been enabled 720 * in jails. 721 */ 722 #ifdef INET 723 /* Multicast goop, grrr... */ 724 return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP; 725 #else /* INET */ 726 return ENXIO; 727 #endif /* INET */ 728 } 729 730 struct ifaddr * 731 ifa_ifwithroute(int flags, const struct sockaddr *dst, struct sockaddr *gateway, 732 u_int fibnum) 733 { 734 struct ifaddr *ifa; 735 int not_found = 0; 736 737 MPASS(in_epoch(net_epoch_preempt)); 738 if ((flags & RTF_GATEWAY) == 0) { 739 /* 740 * If we are adding a route to an interface, 741 * and the interface is a pt to pt link 742 * we should search for the destination 743 * as our clue to the interface. Otherwise 744 * we can use the local address. 745 */ 746 ifa = NULL; 747 if (flags & RTF_HOST) 748 ifa = ifa_ifwithdstaddr(dst, fibnum); 749 if (ifa == NULL) 750 ifa = ifa_ifwithaddr(gateway); 751 } else { 752 /* 753 * If we are adding a route to a remote net 754 * or host, the gateway may still be on the 755 * other end of a pt to pt link. 756 */ 757 ifa = ifa_ifwithdstaddr(gateway, fibnum); 758 } 759 if (ifa == NULL) 760 ifa = ifa_ifwithnet(gateway, 0, fibnum); 761 if (ifa == NULL) { 762 struct rtentry *rt; 763 764 rt = rtalloc1_fib(gateway, 0, flags, fibnum); 765 if (rt == NULL) 766 goto out; 767 /* 768 * dismiss a gateway that is reachable only 769 * through the default router 770 */ 771 switch (gateway->sa_family) { 772 case AF_INET: 773 if (satosin(rt_key(rt))->sin_addr.s_addr == INADDR_ANY) 774 not_found = 1; 775 break; 776 case AF_INET6: 777 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(rt_key(rt))->sin6_addr)) 778 not_found = 1; 779 break; 780 default: 781 break; 782 } 783 if (!not_found && rt->rt_ifa != NULL) { 784 ifa = rt->rt_ifa; 785 } 786 RT_REMREF(rt); 787 RT_UNLOCK(rt); 788 if (not_found || ifa == NULL) 789 goto out; 790 } 791 if (ifa->ifa_addr->sa_family != dst->sa_family) { 792 struct ifaddr *oifa = ifa; 793 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); 794 if (ifa == NULL) 795 ifa = oifa; 796 } 797 out: 798 return (ifa); 799 } 800 801 /* 802 * Do appropriate manipulations of a routing tree given 803 * all the bits of info needed 804 */ 805 int 806 rtrequest_fib(int req, 807 struct sockaddr *dst, 808 struct sockaddr *gateway, 809 struct sockaddr *netmask, 810 int flags, 811 struct rtentry **ret_nrt, 812 u_int fibnum) 813 { 814 struct rt_addrinfo info; 815 816 if (dst->sa_len == 0) 817 return(EINVAL); 818 819 bzero((caddr_t)&info, sizeof(info)); 820 info.rti_flags = flags; 821 info.rti_info[RTAX_DST] = dst; 822 info.rti_info[RTAX_GATEWAY] = gateway; 823 info.rti_info[RTAX_NETMASK] = netmask; 824 return rtrequest1_fib(req, &info, ret_nrt, fibnum); 825 } 826 827 828 /* 829 * Copy most of @rt data into @info. 830 * 831 * If @flags contains NHR_COPY, copies dst,netmask and gw to the 832 * pointers specified by @info structure. Assume such pointers 833 * are zeroed sockaddr-like structures with sa_len field initialized 834 * to reflect size of the provided buffer. if no NHR_COPY is specified, 835 * point dst,netmask and gw @info fields to appropriate @rt values. 836 * 837 * if @flags contains NHR_REF, do refcouting on rt_ifp. 838 * 839 * Returns 0 on success. 840 */ 841 int 842 rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags) 843 { 844 struct rt_metrics *rmx; 845 struct sockaddr *src, *dst; 846 int sa_len; 847 848 if (flags & NHR_COPY) { 849 /* Copy destination if dst is non-zero */ 850 src = rt_key(rt); 851 dst = info->rti_info[RTAX_DST]; 852 sa_len = src->sa_len; 853 if (dst != NULL) { 854 if (src->sa_len > dst->sa_len) 855 return (ENOMEM); 856 memcpy(dst, src, src->sa_len); 857 info->rti_addrs |= RTA_DST; 858 } 859 860 /* Copy mask if set && dst is non-zero */ 861 src = rt_mask(rt); 862 dst = info->rti_info[RTAX_NETMASK]; 863 if (src != NULL && dst != NULL) { 864 865 /* 866 * Radix stores different value in sa_len, 867 * assume rt_mask() to have the same length 868 * as rt_key() 869 */ 870 if (sa_len > dst->sa_len) 871 return (ENOMEM); 872 memcpy(dst, src, src->sa_len); 873 info->rti_addrs |= RTA_NETMASK; 874 } 875 876 /* Copy gateway is set && dst is non-zero */ 877 src = rt->rt_gateway; 878 dst = info->rti_info[RTAX_GATEWAY]; 879 if ((rt->rt_flags & RTF_GATEWAY) && src != NULL && dst != NULL){ 880 if (src->sa_len > dst->sa_len) 881 return (ENOMEM); 882 memcpy(dst, src, src->sa_len); 883 info->rti_addrs |= RTA_GATEWAY; 884 } 885 } else { 886 info->rti_info[RTAX_DST] = rt_key(rt); 887 info->rti_addrs |= RTA_DST; 888 if (rt_mask(rt) != NULL) { 889 info->rti_info[RTAX_NETMASK] = rt_mask(rt); 890 info->rti_addrs |= RTA_NETMASK; 891 } 892 if (rt->rt_flags & RTF_GATEWAY) { 893 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway; 894 info->rti_addrs |= RTA_GATEWAY; 895 } 896 } 897 898 rmx = info->rti_rmx; 899 if (rmx != NULL) { 900 info->rti_mflags |= RTV_MTU; 901 rmx->rmx_mtu = rt->rt_mtu; 902 } 903 904 info->rti_flags = rt->rt_flags; 905 info->rti_ifp = rt->rt_ifp; 906 info->rti_ifa = rt->rt_ifa; 907 ifa_ref(info->rti_ifa); 908 if (flags & NHR_REF) { 909 /* Do 'traditional' refcouting */ 910 if_ref(info->rti_ifp); 911 } 912 913 return (0); 914 } 915 916 /* 917 * Lookups up route entry for @dst in RIB database for fib @fibnum. 918 * Exports entry data to @info using rt_exportinfo(). 919 * 920 * if @flags contains NHR_REF, refcouting is performed on rt_ifp. 921 * All references can be released later by calling rib_free_info() 922 * 923 * Returns 0 on success. 924 * Returns ENOENT for lookup failure, ENOMEM for export failure. 925 */ 926 int 927 rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags, 928 uint32_t flowid, struct rt_addrinfo *info) 929 { 930 RIB_RLOCK_TRACKER; 931 struct rib_head *rh; 932 struct radix_node *rn; 933 struct rtentry *rt; 934 int error; 935 936 KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum")); 937 rh = rt_tables_get_rnh(fibnum, dst->sa_family); 938 if (rh == NULL) 939 return (ENOENT); 940 941 RIB_RLOCK(rh); 942 rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head); 943 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 944 rt = RNTORT(rn); 945 /* Ensure route & ifp is UP */ 946 if (RT_LINK_IS_UP(rt->rt_ifp)) { 947 flags = (flags & NHR_REF) | NHR_COPY; 948 error = rt_exportinfo(rt, info, flags); 949 RIB_RUNLOCK(rh); 950 951 return (error); 952 } 953 } 954 RIB_RUNLOCK(rh); 955 956 return (ENOENT); 957 } 958 959 /* 960 * Releases all references acquired by rib_lookup_info() when 961 * called with NHR_REF flags. 962 */ 963 void 964 rib_free_info(struct rt_addrinfo *info) 965 { 966 967 if_rele(info->rti_ifp); 968 } 969 970 /* 971 * Iterates over all existing fibs in system calling 972 * @setwa_f function prior to traversing each fib. 973 * Calls @wa_f function for each element in current fib. 974 * If af is not AF_UNSPEC, iterates over fibs in particular 975 * address family. 976 */ 977 void 978 rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f, 979 void *arg) 980 { 981 struct rib_head *rnh; 982 uint32_t fibnum; 983 int i; 984 985 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 986 /* Do we want some specific family? */ 987 if (af != AF_UNSPEC) { 988 rnh = rt_tables_get_rnh(fibnum, af); 989 if (rnh == NULL) 990 continue; 991 if (setwa_f != NULL) 992 setwa_f(rnh, fibnum, af, arg); 993 994 RIB_WLOCK(rnh); 995 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 996 RIB_WUNLOCK(rnh); 997 continue; 998 } 999 1000 for (i = 1; i <= AF_MAX; i++) { 1001 rnh = rt_tables_get_rnh(fibnum, i); 1002 if (rnh == NULL) 1003 continue; 1004 if (setwa_f != NULL) 1005 setwa_f(rnh, fibnum, i, arg); 1006 1007 RIB_WLOCK(rnh); 1008 rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg); 1009 RIB_WUNLOCK(rnh); 1010 } 1011 } 1012 } 1013 1014 struct rt_delinfo 1015 { 1016 struct rt_addrinfo info; 1017 struct rib_head *rnh; 1018 struct rtentry *head; 1019 }; 1020 1021 /* 1022 * Conditionally unlinks @rn from radix tree based 1023 * on info data passed in @arg. 1024 */ 1025 static int 1026 rt_checkdelroute(struct radix_node *rn, void *arg) 1027 { 1028 struct rt_delinfo *di; 1029 struct rt_addrinfo *info; 1030 struct rtentry *rt; 1031 int error; 1032 1033 di = (struct rt_delinfo *)arg; 1034 rt = (struct rtentry *)rn; 1035 info = &di->info; 1036 error = 0; 1037 1038 info->rti_info[RTAX_DST] = rt_key(rt); 1039 info->rti_info[RTAX_NETMASK] = rt_mask(rt); 1040 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1041 1042 rt = rt_unlinkrte(di->rnh, info, &error); 1043 if (rt == NULL) { 1044 /* Either not allowed or not matched. Skip entry */ 1045 return (0); 1046 } 1047 1048 /* Entry was unlinked. Add to the list and return */ 1049 rt->rt_chain = di->head; 1050 di->head = rt; 1051 1052 return (0); 1053 } 1054 1055 /* 1056 * Iterates over all existing fibs in system. 1057 * Deletes each element for which @filter_f function returned 1058 * non-zero value. 1059 * If @af is not AF_UNSPEC, iterates over fibs in particular 1060 * address family. 1061 */ 1062 void 1063 rt_foreach_fib_walk_del(int af, rt_filter_f_t *filter_f, void *arg) 1064 { 1065 struct rib_head *rnh; 1066 struct rt_delinfo di; 1067 struct rtentry *rt; 1068 uint32_t fibnum; 1069 int i, start, end; 1070 1071 bzero(&di, sizeof(di)); 1072 di.info.rti_filter = filter_f; 1073 di.info.rti_filterdata = arg; 1074 1075 for (fibnum = 0; fibnum < rt_numfibs; fibnum++) { 1076 /* Do we want some specific family? */ 1077 if (af != AF_UNSPEC) { 1078 start = af; 1079 end = af; 1080 } else { 1081 start = 1; 1082 end = AF_MAX; 1083 } 1084 1085 for (i = start; i <= end; i++) { 1086 rnh = rt_tables_get_rnh(fibnum, i); 1087 if (rnh == NULL) 1088 continue; 1089 di.rnh = rnh; 1090 1091 RIB_WLOCK(rnh); 1092 rnh->rnh_walktree(&rnh->head, rt_checkdelroute, &di); 1093 RIB_WUNLOCK(rnh); 1094 1095 if (di.head == NULL) 1096 continue; 1097 1098 /* We might have something to reclaim */ 1099 while (di.head != NULL) { 1100 rt = di.head; 1101 di.head = rt->rt_chain; 1102 rt->rt_chain = NULL; 1103 1104 /* TODO std rt -> rt_addrinfo export */ 1105 di.info.rti_info[RTAX_DST] = rt_key(rt); 1106 di.info.rti_info[RTAX_NETMASK] = rt_mask(rt); 1107 1108 rt_notifydelete(rt, &di.info); 1109 RTFREE_LOCKED(rt); 1110 } 1111 1112 } 1113 } 1114 } 1115 1116 /* 1117 * Delete Routes for a Network Interface 1118 * 1119 * Called for each routing entry via the rnh->rnh_walktree() call above 1120 * to delete all route entries referencing a detaching network interface. 1121 * 1122 * Arguments: 1123 * rt pointer to rtentry 1124 * arg argument passed to rnh->rnh_walktree() - detaching interface 1125 * 1126 * Returns: 1127 * 0 successful 1128 * errno failed - reason indicated 1129 */ 1130 static int 1131 rt_ifdelroute(const struct rtentry *rt, void *arg) 1132 { 1133 struct ifnet *ifp = arg; 1134 1135 if (rt->rt_ifp != ifp) 1136 return (0); 1137 1138 /* 1139 * Protect (sorta) against walktree recursion problems 1140 * with cloned routes 1141 */ 1142 if ((rt->rt_flags & RTF_UP) == 0) 1143 return (0); 1144 1145 return (1); 1146 } 1147 1148 /* 1149 * Delete all remaining routes using this interface 1150 * Unfortuneatly the only way to do this is to slog through 1151 * the entire routing table looking for routes which point 1152 * to this interface...oh well... 1153 */ 1154 void 1155 rt_flushifroutes_af(struct ifnet *ifp, int af) 1156 { 1157 KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d", 1158 __func__, af, AF_MAX)); 1159 1160 rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp); 1161 } 1162 1163 void 1164 rt_flushifroutes(struct ifnet *ifp) 1165 { 1166 1167 rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp); 1168 } 1169 1170 /* 1171 * Conditionally unlinks rtentry matching data inside @info from @rnh. 1172 * Returns unlinked, locked and referenced @rtentry on success, 1173 * Returns NULL and sets @perror to: 1174 * ESRCH - if prefix was not found, 1175 * EADDRINUSE - if trying to delete PINNED route without appropriate flag. 1176 * ENOENT - if supplied filter function returned 0 (not matched). 1177 */ 1178 static struct rtentry * 1179 rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror) 1180 { 1181 struct sockaddr *dst, *netmask; 1182 struct rtentry *rt; 1183 struct radix_node *rn; 1184 1185 dst = info->rti_info[RTAX_DST]; 1186 netmask = info->rti_info[RTAX_NETMASK]; 1187 1188 rt = (struct rtentry *)rnh->rnh_lookup(dst, netmask, &rnh->head); 1189 if (rt == NULL) { 1190 *perror = ESRCH; 1191 return (NULL); 1192 } 1193 1194 if ((info->rti_flags & RTF_PINNED) == 0) { 1195 /* Check if target route can be deleted */ 1196 if (rt->rt_flags & RTF_PINNED) { 1197 *perror = EADDRINUSE; 1198 return (NULL); 1199 } 1200 } 1201 1202 if (info->rti_filter != NULL) { 1203 if (info->rti_filter(rt, info->rti_filterdata) == 0) { 1204 /* Not matched */ 1205 *perror = ENOENT; 1206 return (NULL); 1207 } 1208 1209 /* 1210 * Filter function requested rte deletion. 1211 * Ease the caller work by filling in remaining info 1212 * from that particular entry. 1213 */ 1214 info->rti_info[RTAX_GATEWAY] = rt->rt_gateway; 1215 } 1216 1217 /* 1218 * Remove the item from the tree and return it. 1219 * Complain if it is not there and do no more processing. 1220 */ 1221 *perror = ESRCH; 1222 #ifdef RADIX_MPATH 1223 if (rt_mpath_capable(rnh)) 1224 rn = rt_mpath_unlink(rnh, info, rt, perror); 1225 else 1226 #endif 1227 rn = rnh->rnh_deladdr(dst, netmask, &rnh->head); 1228 if (rn == NULL) 1229 return (NULL); 1230 1231 if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT)) 1232 panic ("rtrequest delete"); 1233 1234 rt = RNTORT(rn); 1235 RT_LOCK(rt); 1236 RT_ADDREF(rt); 1237 rt->rt_flags &= ~RTF_UP; 1238 1239 *perror = 0; 1240 1241 return (rt); 1242 } 1243 1244 static void 1245 rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info) 1246 { 1247 struct ifaddr *ifa; 1248 1249 /* 1250 * give the protocol a chance to keep things in sync. 1251 */ 1252 ifa = rt->rt_ifa; 1253 if (ifa != NULL && ifa->ifa_rtrequest != NULL) 1254 ifa->ifa_rtrequest(RTM_DELETE, rt, info); 1255 1256 /* 1257 * One more rtentry floating around that is not 1258 * linked to the routing table. rttrash will be decremented 1259 * when RTFREE(rt) is eventually called. 1260 */ 1261 V_rttrash++; 1262 } 1263 1264 1265 /* 1266 * These (questionable) definitions of apparent local variables apply 1267 * to the next two functions. XXXXXX!!! 1268 */ 1269 #define dst info->rti_info[RTAX_DST] 1270 #define gateway info->rti_info[RTAX_GATEWAY] 1271 #define netmask info->rti_info[RTAX_NETMASK] 1272 #define ifaaddr info->rti_info[RTAX_IFA] 1273 #define ifpaddr info->rti_info[RTAX_IFP] 1274 #define flags info->rti_flags 1275 1276 /* 1277 * Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined, 1278 * it will be referenced so the caller must free it. 1279 */ 1280 int 1281 rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum) 1282 { 1283 struct epoch_tracker et; 1284 struct ifaddr *ifa; 1285 int needref, error; 1286 1287 /* 1288 * ifp may be specified by sockaddr_dl 1289 * when protocol address is ambiguous. 1290 */ 1291 error = 0; 1292 needref = (info->rti_ifa == NULL); 1293 NET_EPOCH_ENTER(et); 1294 if (info->rti_ifp == NULL && ifpaddr != NULL && 1295 ifpaddr->sa_family == AF_LINK && 1296 (ifa = ifa_ifwithnet(ifpaddr, 0, fibnum)) != NULL) { 1297 info->rti_ifp = ifa->ifa_ifp; 1298 } 1299 if (info->rti_ifa == NULL && ifaaddr != NULL) 1300 info->rti_ifa = ifa_ifwithaddr(ifaaddr); 1301 if (info->rti_ifa == NULL) { 1302 struct sockaddr *sa; 1303 1304 sa = ifaaddr != NULL ? ifaaddr : 1305 (gateway != NULL ? gateway : dst); 1306 if (sa != NULL && info->rti_ifp != NULL) 1307 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); 1308 else if (dst != NULL && gateway != NULL) 1309 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway, 1310 fibnum); 1311 else if (sa != NULL) 1312 info->rti_ifa = ifa_ifwithroute(flags, sa, sa, 1313 fibnum); 1314 } 1315 if (needref && info->rti_ifa != NULL) { 1316 if (info->rti_ifp == NULL) 1317 info->rti_ifp = info->rti_ifa->ifa_ifp; 1318 ifa_ref(info->rti_ifa); 1319 } else 1320 error = ENETUNREACH; 1321 NET_EPOCH_EXIT(et); 1322 return (error); 1323 } 1324 1325 static int 1326 if_updatemtu_cb(struct radix_node *rn, void *arg) 1327 { 1328 struct rtentry *rt; 1329 struct if_mtuinfo *ifmtu; 1330 1331 rt = (struct rtentry *)rn; 1332 ifmtu = (struct if_mtuinfo *)arg; 1333 1334 if (rt->rt_ifp != ifmtu->ifp) 1335 return (0); 1336 1337 if (rt->rt_mtu >= ifmtu->mtu) { 1338 /* We have to decrease mtu regardless of flags */ 1339 rt->rt_mtu = ifmtu->mtu; 1340 return (0); 1341 } 1342 1343 /* 1344 * New MTU is bigger. Check if are allowed to alter it 1345 */ 1346 if ((rt->rt_flags & (RTF_FIXEDMTU | RTF_GATEWAY | RTF_HOST)) != 0) { 1347 1348 /* 1349 * Skip routes with user-supplied MTU and 1350 * non-interface routes 1351 */ 1352 return (0); 1353 } 1354 1355 /* We are safe to update route MTU */ 1356 rt->rt_mtu = ifmtu->mtu; 1357 1358 return (0); 1359 } 1360 1361 void 1362 rt_updatemtu(struct ifnet *ifp) 1363 { 1364 struct if_mtuinfo ifmtu; 1365 struct rib_head *rnh; 1366 int i, j; 1367 1368 ifmtu.ifp = ifp; 1369 1370 /* 1371 * Try to update rt_mtu for all routes using this interface 1372 * Unfortunately the only way to do this is to traverse all 1373 * routing tables in all fibs/domains. 1374 */ 1375 for (i = 1; i <= AF_MAX; i++) { 1376 ifmtu.mtu = if_getmtu_family(ifp, i); 1377 for (j = 0; j < rt_numfibs; j++) { 1378 rnh = rt_tables_get_rnh(j, i); 1379 if (rnh == NULL) 1380 continue; 1381 RIB_WLOCK(rnh); 1382 rnh->rnh_walktree(&rnh->head, if_updatemtu_cb, &ifmtu); 1383 RIB_WUNLOCK(rnh); 1384 } 1385 } 1386 } 1387 1388 1389 #if 0 1390 int p_sockaddr(char *buf, int buflen, struct sockaddr *s); 1391 int rt_print(char *buf, int buflen, struct rtentry *rt); 1392 1393 int 1394 p_sockaddr(char *buf, int buflen, struct sockaddr *s) 1395 { 1396 void *paddr = NULL; 1397 1398 switch (s->sa_family) { 1399 case AF_INET: 1400 paddr = &((struct sockaddr_in *)s)->sin_addr; 1401 break; 1402 case AF_INET6: 1403 paddr = &((struct sockaddr_in6 *)s)->sin6_addr; 1404 break; 1405 } 1406 1407 if (paddr == NULL) 1408 return (0); 1409 1410 if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL) 1411 return (0); 1412 1413 return (strlen(buf)); 1414 } 1415 1416 int 1417 rt_print(char *buf, int buflen, struct rtentry *rt) 1418 { 1419 struct sockaddr *addr, *mask; 1420 int i = 0; 1421 1422 addr = rt_key(rt); 1423 mask = rt_mask(rt); 1424 1425 i = p_sockaddr(buf, buflen, addr); 1426 if (!(rt->rt_flags & RTF_HOST)) { 1427 buf[i++] = '/'; 1428 i += p_sockaddr(buf + i, buflen - i, mask); 1429 } 1430 1431 if (rt->rt_flags & RTF_GATEWAY) { 1432 buf[i++] = '>'; 1433 i += p_sockaddr(buf + i, buflen - i, rt->rt_gateway); 1434 } 1435 1436 return (i); 1437 } 1438 #endif 1439 1440 #ifdef RADIX_MPATH 1441 /* 1442 * Deletes key for single-path routes, unlinks rtentry with 1443 * gateway specified in @info from multi-path routes. 1444 * 1445 * Returnes unlinked entry. In case of failure, returns NULL 1446 * and sets @perror to ESRCH. 1447 */ 1448 static struct radix_node * 1449 rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info, 1450 struct rtentry *rto, int *perror) 1451 { 1452 /* 1453 * if we got multipath routes, we require users to specify 1454 * a matching RTAX_GATEWAY. 1455 */ 1456 struct rtentry *rt; // *rto = NULL; 1457 struct radix_node *rn; 1458 struct sockaddr *gw; 1459 1460 gw = info->rti_info[RTAX_GATEWAY]; 1461 rt = rt_mpath_matchgate(rto, gw); 1462 if (rt == NULL) { 1463 *perror = ESRCH; 1464 return (NULL); 1465 } 1466 1467 /* 1468 * this is the first entry in the chain 1469 */ 1470 if (rto == rt) { 1471 rn = rn_mpath_next((struct radix_node *)rt); 1472 /* 1473 * there is another entry, now it's active 1474 */ 1475 if (rn) { 1476 rto = RNTORT(rn); 1477 RT_LOCK(rto); 1478 rto->rt_flags |= RTF_UP; 1479 RT_UNLOCK(rto); 1480 } else if (rt->rt_flags & RTF_GATEWAY) { 1481 /* 1482 * For gateway routes, we need to 1483 * make sure that we we are deleting 1484 * the correct gateway. 1485 * rt_mpath_matchgate() does not 1486 * check the case when there is only 1487 * one route in the chain. 1488 */ 1489 if (gw && 1490 (rt->rt_gateway->sa_len != gw->sa_len || 1491 memcmp(rt->rt_gateway, gw, gw->sa_len))) { 1492 *perror = ESRCH; 1493 return (NULL); 1494 } 1495 } 1496 1497 /* 1498 * use the normal delete code to remove 1499 * the first entry 1500 */ 1501 rn = rnh->rnh_deladdr(dst, netmask, &rnh->head); 1502 *perror = 0; 1503 return (rn); 1504 } 1505 1506 /* 1507 * if the entry is 2nd and on up 1508 */ 1509 if (rt_mpath_deldup(rto, rt) == 0) 1510 panic ("rtrequest1: rt_mpath_deldup"); 1511 *perror = 0; 1512 rn = (struct radix_node *)rt; 1513 return (rn); 1514 } 1515 #endif 1516 1517 int 1518 rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt, 1519 u_int fibnum) 1520 { 1521 int error = 0; 1522 struct rtentry *rt, *rt_old; 1523 struct radix_node *rn; 1524 struct rib_head *rnh; 1525 struct ifaddr *ifa; 1526 struct sockaddr *ndst; 1527 struct sockaddr_storage mdst; 1528 1529 KASSERT((fibnum < rt_numfibs), ("rtrequest1_fib: bad fibnum")); 1530 KASSERT((flags & RTF_RNH_LOCKED) == 0, ("rtrequest1_fib: locked")); 1531 switch (dst->sa_family) { 1532 case AF_INET6: 1533 case AF_INET: 1534 /* We support multiple FIBs. */ 1535 break; 1536 default: 1537 fibnum = RT_DEFAULT_FIB; 1538 break; 1539 } 1540 1541 /* 1542 * Find the correct routing tree to use for this Address Family 1543 */ 1544 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 1545 if (rnh == NULL) 1546 return (EAFNOSUPPORT); 1547 1548 /* 1549 * If we are adding a host route then we don't want to put 1550 * a netmask in the tree, nor do we want to clone it. 1551 */ 1552 if (flags & RTF_HOST) 1553 netmask = NULL; 1554 1555 switch (req) { 1556 case RTM_DELETE: 1557 if (netmask) { 1558 rt_maskedcopy(dst, (struct sockaddr *)&mdst, netmask); 1559 dst = (struct sockaddr *)&mdst; 1560 } 1561 1562 RIB_WLOCK(rnh); 1563 rt = rt_unlinkrte(rnh, info, &error); 1564 RIB_WUNLOCK(rnh); 1565 if (error != 0) 1566 return (error); 1567 1568 rt_notifydelete(rt, info); 1569 1570 /* 1571 * If the caller wants it, then it can have it, 1572 * but it's up to it to free the rtentry as we won't be 1573 * doing it. 1574 */ 1575 if (ret_nrt) { 1576 *ret_nrt = rt; 1577 RT_UNLOCK(rt); 1578 } else 1579 RTFREE_LOCKED(rt); 1580 break; 1581 case RTM_RESOLVE: 1582 /* 1583 * resolve was only used for route cloning 1584 * here for compat 1585 */ 1586 break; 1587 case RTM_ADD: 1588 if ((flags & RTF_GATEWAY) && !gateway) 1589 return (EINVAL); 1590 if (dst && gateway && (dst->sa_family != gateway->sa_family) && 1591 (gateway->sa_family != AF_UNSPEC) && (gateway->sa_family != AF_LINK)) 1592 return (EINVAL); 1593 1594 if (info->rti_ifa == NULL) { 1595 error = rt_getifa_fib(info, fibnum); 1596 if (error) 1597 return (error); 1598 } 1599 rt = uma_zalloc(V_rtzone, M_NOWAIT); 1600 if (rt == NULL) { 1601 return (ENOBUFS); 1602 } 1603 rt->rt_flags = RTF_UP | flags; 1604 rt->rt_fibnum = fibnum; 1605 /* 1606 * Add the gateway. Possibly re-malloc-ing the storage for it. 1607 */ 1608 if ((error = rt_setgate(rt, dst, gateway)) != 0) { 1609 uma_zfree(V_rtzone, rt); 1610 return (error); 1611 } 1612 1613 /* 1614 * point to the (possibly newly malloc'd) dest address. 1615 */ 1616 ndst = (struct sockaddr *)rt_key(rt); 1617 1618 /* 1619 * make sure it contains the value we want (masked if needed). 1620 */ 1621 if (netmask) { 1622 rt_maskedcopy(dst, ndst, netmask); 1623 } else 1624 bcopy(dst, ndst, dst->sa_len); 1625 1626 /* 1627 * We use the ifa reference returned by rt_getifa_fib(). 1628 * This moved from below so that rnh->rnh_addaddr() can 1629 * examine the ifa and ifa->ifa_ifp if it so desires. 1630 */ 1631 ifa = info->rti_ifa; 1632 ifa_ref(ifa); 1633 rt->rt_ifa = ifa; 1634 rt->rt_ifp = ifa->ifa_ifp; 1635 rt->rt_weight = 1; 1636 1637 rt_setmetrics(info, rt); 1638 1639 RIB_WLOCK(rnh); 1640 RT_LOCK(rt); 1641 #ifdef RADIX_MPATH 1642 /* do not permit exactly the same dst/mask/gw pair */ 1643 if (rt_mpath_capable(rnh) && 1644 rt_mpath_conflict(rnh, rt, netmask)) { 1645 RIB_WUNLOCK(rnh); 1646 1647 ifa_free(rt->rt_ifa); 1648 R_Free(rt_key(rt)); 1649 uma_zfree(V_rtzone, rt); 1650 return (EEXIST); 1651 } 1652 #endif 1653 1654 /* XXX mtu manipulation will be done in rnh_addaddr -- itojun */ 1655 rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes); 1656 1657 rt_old = NULL; 1658 if (rn == NULL && (info->rti_flags & RTF_PINNED) != 0) { 1659 1660 /* 1661 * Force removal and re-try addition 1662 * TODO: better multipath&pinned support 1663 */ 1664 struct sockaddr *info_dst = info->rti_info[RTAX_DST]; 1665 info->rti_info[RTAX_DST] = ndst; 1666 /* Do not delete existing PINNED(interface) routes */ 1667 info->rti_flags &= ~RTF_PINNED; 1668 rt_old = rt_unlinkrte(rnh, info, &error); 1669 info->rti_flags |= RTF_PINNED; 1670 info->rti_info[RTAX_DST] = info_dst; 1671 if (rt_old != NULL) 1672 rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, 1673 rt->rt_nodes); 1674 } 1675 RIB_WUNLOCK(rnh); 1676 1677 if (rt_old != NULL) 1678 RT_UNLOCK(rt_old); 1679 1680 /* 1681 * If it still failed to go into the tree, 1682 * then un-make it (this should be a function) 1683 */ 1684 if (rn == NULL) { 1685 ifa_free(rt->rt_ifa); 1686 R_Free(rt_key(rt)); 1687 uma_zfree(V_rtzone, rt); 1688 return (EEXIST); 1689 } 1690 1691 if (rt_old != NULL) { 1692 rt_notifydelete(rt_old, info); 1693 RTFREE(rt_old); 1694 } 1695 1696 /* 1697 * If this protocol has something to add to this then 1698 * allow it to do that as well. 1699 */ 1700 if (ifa->ifa_rtrequest) 1701 ifa->ifa_rtrequest(req, rt, info); 1702 1703 /* 1704 * actually return a resultant rtentry and 1705 * give the caller a single reference. 1706 */ 1707 if (ret_nrt) { 1708 *ret_nrt = rt; 1709 RT_ADDREF(rt); 1710 } 1711 rnh->rnh_gen++; /* Routing table updated */ 1712 RT_UNLOCK(rt); 1713 break; 1714 case RTM_CHANGE: 1715 RIB_WLOCK(rnh); 1716 error = rtrequest1_fib_change(rnh, info, ret_nrt, fibnum); 1717 RIB_WUNLOCK(rnh); 1718 break; 1719 default: 1720 error = EOPNOTSUPP; 1721 } 1722 1723 return (error); 1724 } 1725 1726 #undef dst 1727 #undef gateway 1728 #undef netmask 1729 #undef ifaaddr 1730 #undef ifpaddr 1731 #undef flags 1732 1733 static int 1734 rtrequest1_fib_change(struct rib_head *rnh, struct rt_addrinfo *info, 1735 struct rtentry **ret_nrt, u_int fibnum) 1736 { 1737 struct rtentry *rt = NULL; 1738 int error = 0; 1739 int free_ifa = 0; 1740 int family, mtu; 1741 struct if_mtuinfo ifmtu; 1742 1743 RIB_WLOCK_ASSERT(rnh); 1744 1745 rt = (struct rtentry *)rnh->rnh_lookup(info->rti_info[RTAX_DST], 1746 info->rti_info[RTAX_NETMASK], &rnh->head); 1747 1748 if (rt == NULL) 1749 return (ESRCH); 1750 1751 #ifdef RADIX_MPATH 1752 /* 1753 * If we got multipath routes, 1754 * we require users to specify a matching RTAX_GATEWAY. 1755 */ 1756 if (rt_mpath_capable(rnh)) { 1757 rt = rt_mpath_matchgate(rt, info->rti_info[RTAX_GATEWAY]); 1758 if (rt == NULL) 1759 return (ESRCH); 1760 } 1761 #endif 1762 1763 RT_LOCK(rt); 1764 1765 rt_setmetrics(info, rt); 1766 1767 /* 1768 * New gateway could require new ifaddr, ifp; 1769 * flags may also be different; ifp may be specified 1770 * by ll sockaddr when protocol address is ambiguous 1771 */ 1772 if (((rt->rt_flags & RTF_GATEWAY) && 1773 info->rti_info[RTAX_GATEWAY] != NULL) || 1774 info->rti_info[RTAX_IFP] != NULL || 1775 (info->rti_info[RTAX_IFA] != NULL && 1776 !sa_equal(info->rti_info[RTAX_IFA], rt->rt_ifa->ifa_addr))) { 1777 /* 1778 * XXX: Temporarily set RTF_RNH_LOCKED flag in the rti_flags 1779 * to avoid rlock in the ifa_ifwithroute(). 1780 */ 1781 info->rti_flags |= RTF_RNH_LOCKED; 1782 error = rt_getifa_fib(info, fibnum); 1783 info->rti_flags &= ~RTF_RNH_LOCKED; 1784 if (info->rti_ifa != NULL) 1785 free_ifa = 1; 1786 1787 if (error != 0) 1788 goto bad; 1789 } 1790 1791 /* Check if outgoing interface has changed */ 1792 if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa && 1793 rt->rt_ifa != NULL) { 1794 if (rt->rt_ifa->ifa_rtrequest != NULL) 1795 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, info); 1796 ifa_free(rt->rt_ifa); 1797 rt->rt_ifa = NULL; 1798 } 1799 /* Update gateway address */ 1800 if (info->rti_info[RTAX_GATEWAY] != NULL) { 1801 error = rt_setgate(rt, rt_key(rt), info->rti_info[RTAX_GATEWAY]); 1802 if (error != 0) 1803 goto bad; 1804 1805 rt->rt_flags &= ~RTF_GATEWAY; 1806 rt->rt_flags |= (RTF_GATEWAY & info->rti_flags); 1807 } 1808 1809 if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa) { 1810 ifa_ref(info->rti_ifa); 1811 rt->rt_ifa = info->rti_ifa; 1812 rt->rt_ifp = info->rti_ifp; 1813 } 1814 /* Allow some flags to be toggled on change. */ 1815 rt->rt_flags &= ~RTF_FMASK; 1816 rt->rt_flags |= info->rti_flags & RTF_FMASK; 1817 1818 if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest != NULL) 1819 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, info); 1820 1821 /* Alter route MTU if necessary */ 1822 if (rt->rt_ifp != NULL) { 1823 family = info->rti_info[RTAX_DST]->sa_family; 1824 mtu = if_getmtu_family(rt->rt_ifp, family); 1825 /* Set default MTU */ 1826 if (rt->rt_mtu == 0) 1827 rt->rt_mtu = mtu; 1828 if (rt->rt_mtu != mtu) { 1829 /* Check if we really need to update */ 1830 ifmtu.ifp = rt->rt_ifp; 1831 ifmtu.mtu = mtu; 1832 if_updatemtu_cb(rt->rt_nodes, &ifmtu); 1833 } 1834 } 1835 1836 /* 1837 * This route change may have modified the route's gateway. In that 1838 * case, any inpcbs that have cached this route need to invalidate their 1839 * llentry cache. 1840 */ 1841 rnh->rnh_gen++; 1842 1843 if (ret_nrt) { 1844 *ret_nrt = rt; 1845 RT_ADDREF(rt); 1846 } 1847 bad: 1848 RT_UNLOCK(rt); 1849 if (free_ifa != 0) { 1850 ifa_free(info->rti_ifa); 1851 info->rti_ifa = NULL; 1852 } 1853 return (error); 1854 } 1855 1856 static void 1857 rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt) 1858 { 1859 1860 if (info->rti_mflags & RTV_MTU) { 1861 if (info->rti_rmx->rmx_mtu != 0) { 1862 1863 /* 1864 * MTU was explicitly provided by user. 1865 * Keep it. 1866 */ 1867 rt->rt_flags |= RTF_FIXEDMTU; 1868 } else { 1869 1870 /* 1871 * User explicitly sets MTU to 0. 1872 * Assume rollback to default. 1873 */ 1874 rt->rt_flags &= ~RTF_FIXEDMTU; 1875 } 1876 rt->rt_mtu = info->rti_rmx->rmx_mtu; 1877 } 1878 if (info->rti_mflags & RTV_WEIGHT) 1879 rt->rt_weight = info->rti_rmx->rmx_weight; 1880 /* Kernel -> userland timebase conversion. */ 1881 if (info->rti_mflags & RTV_EXPIRE) 1882 rt->rt_expire = info->rti_rmx->rmx_expire ? 1883 info->rti_rmx->rmx_expire - time_second + time_uptime : 0; 1884 } 1885 1886 int 1887 rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate) 1888 { 1889 /* XXX dst may be overwritten, can we move this to below */ 1890 int dlen = SA_SIZE(dst), glen = SA_SIZE(gate); 1891 1892 /* 1893 * Prepare to store the gateway in rt->rt_gateway. 1894 * Both dst and gateway are stored one after the other in the same 1895 * malloc'd chunk. If we have room, we can reuse the old buffer, 1896 * rt_gateway already points to the right place. 1897 * Otherwise, malloc a new block and update the 'dst' address. 1898 */ 1899 if (rt->rt_gateway == NULL || glen > SA_SIZE(rt->rt_gateway)) { 1900 caddr_t new; 1901 1902 R_Malloc(new, caddr_t, dlen + glen); 1903 if (new == NULL) 1904 return ENOBUFS; 1905 /* 1906 * XXX note, we copy from *dst and not *rt_key(rt) because 1907 * rt_setgate() can be called to initialize a newly 1908 * allocated route entry, in which case rt_key(rt) == NULL 1909 * (and also rt->rt_gateway == NULL). 1910 * Free()/free() handle a NULL argument just fine. 1911 */ 1912 bcopy(dst, new, dlen); 1913 R_Free(rt_key(rt)); /* free old block, if any */ 1914 rt_key(rt) = (struct sockaddr *)new; 1915 rt->rt_gateway = (struct sockaddr *)(new + dlen); 1916 } 1917 1918 /* 1919 * Copy the new gateway value into the memory chunk. 1920 */ 1921 bcopy(gate, rt->rt_gateway, glen); 1922 1923 return (0); 1924 } 1925 1926 void 1927 rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask) 1928 { 1929 u_char *cp1 = (u_char *)src; 1930 u_char *cp2 = (u_char *)dst; 1931 u_char *cp3 = (u_char *)netmask; 1932 u_char *cplim = cp2 + *cp3; 1933 u_char *cplim2 = cp2 + *cp1; 1934 1935 *cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */ 1936 cp3 += 2; 1937 if (cplim > cplim2) 1938 cplim = cplim2; 1939 while (cp2 < cplim) 1940 *cp2++ = *cp1++ & *cp3++; 1941 if (cp2 < cplim2) 1942 bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2)); 1943 } 1944 1945 /* 1946 * Set up a routing table entry, normally 1947 * for an interface. 1948 */ 1949 #define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */ 1950 static inline int 1951 rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum) 1952 { 1953 RIB_RLOCK_TRACKER; 1954 struct sockaddr *dst; 1955 struct sockaddr *netmask; 1956 struct rtentry *rt = NULL; 1957 struct rt_addrinfo info; 1958 int error = 0; 1959 int startfib, endfib; 1960 char tempbuf[_SOCKADDR_TMPSIZE]; 1961 int didwork = 0; 1962 int a_failure = 0; 1963 static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1964 struct rib_head *rnh; 1965 1966 if (flags & RTF_HOST) { 1967 dst = ifa->ifa_dstaddr; 1968 netmask = NULL; 1969 } else { 1970 dst = ifa->ifa_addr; 1971 netmask = ifa->ifa_netmask; 1972 } 1973 if (dst->sa_len == 0) 1974 return(EINVAL); 1975 switch (dst->sa_family) { 1976 case AF_INET6: 1977 case AF_INET: 1978 /* We support multiple FIBs. */ 1979 break; 1980 default: 1981 fibnum = RT_DEFAULT_FIB; 1982 break; 1983 } 1984 if (fibnum == RT_ALL_FIBS) { 1985 if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD) 1986 startfib = endfib = ifa->ifa_ifp->if_fib; 1987 else { 1988 startfib = 0; 1989 endfib = rt_numfibs - 1; 1990 } 1991 } else { 1992 KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum")); 1993 startfib = fibnum; 1994 endfib = fibnum; 1995 } 1996 1997 /* 1998 * If it's a delete, check that if it exists, 1999 * it's on the correct interface or we might scrub 2000 * a route to another ifa which would 2001 * be confusing at best and possibly worse. 2002 */ 2003 if (cmd == RTM_DELETE) { 2004 /* 2005 * It's a delete, so it should already exist.. 2006 * If it's a net, mask off the host bits 2007 * (Assuming we have a mask) 2008 * XXX this is kinda inet specific.. 2009 */ 2010 if (netmask != NULL) { 2011 rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask); 2012 dst = (struct sockaddr *)tempbuf; 2013 } 2014 } 2015 /* 2016 * Now go through all the requested tables (fibs) and do the 2017 * requested action. Realistically, this will either be fib 0 2018 * for protocols that don't do multiple tables or all the 2019 * tables for those that do. 2020 */ 2021 for ( fibnum = startfib; fibnum <= endfib; fibnum++) { 2022 if (cmd == RTM_DELETE) { 2023 struct radix_node *rn; 2024 /* 2025 * Look up an rtentry that is in the routing tree and 2026 * contains the correct info. 2027 */ 2028 rnh = rt_tables_get_rnh(fibnum, dst->sa_family); 2029 if (rnh == NULL) 2030 /* this table doesn't exist but others might */ 2031 continue; 2032 RIB_RLOCK(rnh); 2033 rn = rnh->rnh_lookup(dst, netmask, &rnh->head); 2034 #ifdef RADIX_MPATH 2035 if (rt_mpath_capable(rnh)) { 2036 2037 if (rn == NULL) 2038 error = ESRCH; 2039 else { 2040 rt = RNTORT(rn); 2041 /* 2042 * for interface route the 2043 * rt->rt_gateway is sockaddr_intf 2044 * for cloning ARP entries, so 2045 * rt_mpath_matchgate must use the 2046 * interface address 2047 */ 2048 rt = rt_mpath_matchgate(rt, 2049 ifa->ifa_addr); 2050 if (rt == NULL) 2051 error = ESRCH; 2052 } 2053 } 2054 #endif 2055 error = (rn == NULL || 2056 (rn->rn_flags & RNF_ROOT) || 2057 RNTORT(rn)->rt_ifa != ifa); 2058 RIB_RUNLOCK(rnh); 2059 if (error) { 2060 /* this is only an error if bad on ALL tables */ 2061 continue; 2062 } 2063 } 2064 /* 2065 * Do the actual request 2066 */ 2067 bzero((caddr_t)&info, sizeof(info)); 2068 ifa_ref(ifa); 2069 info.rti_ifa = ifa; 2070 info.rti_flags = flags | 2071 (ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED; 2072 info.rti_info[RTAX_DST] = dst; 2073 /* 2074 * doing this for compatibility reasons 2075 */ 2076 if (cmd == RTM_ADD) 2077 info.rti_info[RTAX_GATEWAY] = 2078 (struct sockaddr *)&null_sdl; 2079 else 2080 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 2081 info.rti_info[RTAX_NETMASK] = netmask; 2082 error = rtrequest1_fib(cmd, &info, &rt, fibnum); 2083 2084 if (error == 0 && rt != NULL) { 2085 /* 2086 * notify any listening routing agents of the change 2087 */ 2088 RT_LOCK(rt); 2089 #ifdef RADIX_MPATH 2090 /* 2091 * in case address alias finds the first address 2092 * e.g. ifconfig bge0 192.0.2.246/24 2093 * e.g. ifconfig bge0 192.0.2.247/24 2094 * the address set in the route is 192.0.2.246 2095 * so we need to replace it with 192.0.2.247 2096 */ 2097 if (memcmp(rt->rt_ifa->ifa_addr, 2098 ifa->ifa_addr, ifa->ifa_addr->sa_len)) { 2099 ifa_free(rt->rt_ifa); 2100 ifa_ref(ifa); 2101 rt->rt_ifp = ifa->ifa_ifp; 2102 rt->rt_ifa = ifa; 2103 } 2104 #endif 2105 /* 2106 * doing this for compatibility reasons 2107 */ 2108 if (cmd == RTM_ADD) { 2109 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_type = 2110 rt->rt_ifp->if_type; 2111 ((struct sockaddr_dl *)rt->rt_gateway)->sdl_index = 2112 rt->rt_ifp->if_index; 2113 } 2114 RT_ADDREF(rt); 2115 RT_UNLOCK(rt); 2116 rt_newaddrmsg_fib(cmd, ifa, error, rt, fibnum); 2117 RT_LOCK(rt); 2118 RT_REMREF(rt); 2119 if (cmd == RTM_DELETE) { 2120 /* 2121 * If we are deleting, and we found an entry, 2122 * then it's been removed from the tree.. 2123 * now throw it away. 2124 */ 2125 RTFREE_LOCKED(rt); 2126 } else { 2127 if (cmd == RTM_ADD) { 2128 /* 2129 * We just wanted to add it.. 2130 * we don't actually need a reference. 2131 */ 2132 RT_REMREF(rt); 2133 } 2134 RT_UNLOCK(rt); 2135 } 2136 didwork = 1; 2137 } 2138 if (error) 2139 a_failure = error; 2140 } 2141 if (cmd == RTM_DELETE) { 2142 if (didwork) { 2143 error = 0; 2144 } else { 2145 /* we only give an error if it wasn't in any table */ 2146 error = ((flags & RTF_HOST) ? 2147 EHOSTUNREACH : ENETUNREACH); 2148 } 2149 } else { 2150 if (a_failure) { 2151 /* return an error if any of them failed */ 2152 error = a_failure; 2153 } 2154 } 2155 return (error); 2156 } 2157 2158 /* 2159 * Set up a routing table entry, normally 2160 * for an interface. 2161 */ 2162 int 2163 rtinit(struct ifaddr *ifa, int cmd, int flags) 2164 { 2165 struct sockaddr *dst; 2166 int fib = RT_DEFAULT_FIB; 2167 2168 if (flags & RTF_HOST) { 2169 dst = ifa->ifa_dstaddr; 2170 } else { 2171 dst = ifa->ifa_addr; 2172 } 2173 2174 switch (dst->sa_family) { 2175 case AF_INET6: 2176 case AF_INET: 2177 /* We do support multiple FIBs. */ 2178 fib = RT_ALL_FIBS; 2179 break; 2180 } 2181 return (rtinit1(ifa, cmd, flags, fib)); 2182 } 2183 2184 /* 2185 * Announce interface address arrival/withdraw 2186 * Returns 0 on success. 2187 */ 2188 int 2189 rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum) 2190 { 2191 2192 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 2193 ("unexpected cmd %d", cmd)); 2194 2195 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 2196 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 2197 2198 #if defined(INET) || defined(INET6) 2199 #ifdef SCTP 2200 /* 2201 * notify the SCTP stack 2202 * this will only get called when an address is added/deleted 2203 * XXX pass the ifaddr struct instead if ifa->ifa_addr... 2204 */ 2205 sctp_addr_change(ifa, cmd); 2206 #endif /* SCTP */ 2207 #endif 2208 return (rtsock_addrmsg(cmd, ifa, fibnum)); 2209 } 2210 2211 /* 2212 * Announce route addition/removal. 2213 * Users of this function MUST validate input data BEFORE calling. 2214 * However we have to be able to handle invalid data: 2215 * if some userland app sends us "invalid" route message (invalid mask, 2216 * no dst, wrong address families, etc...) we need to pass it back 2217 * to app (and any other rtsock consumers) with rtm_errno field set to 2218 * non-zero value. 2219 * Returns 0 on success. 2220 */ 2221 int 2222 rt_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt, 2223 int fibnum) 2224 { 2225 2226 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 2227 ("unexpected cmd %d", cmd)); 2228 2229 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 2230 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 2231 2232 KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__)); 2233 2234 return (rtsock_routemsg(cmd, ifp, error, rt, fibnum)); 2235 } 2236 2237 void 2238 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt) 2239 { 2240 2241 rt_newaddrmsg_fib(cmd, ifa, error, rt, RT_ALL_FIBS); 2242 } 2243 2244 /* 2245 * This is called to generate messages from the routing socket 2246 * indicating a network interface has had addresses associated with it. 2247 */ 2248 void 2249 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt, 2250 int fibnum) 2251 { 2252 2253 KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE, 2254 ("unexpected cmd %u", cmd)); 2255 KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs), 2256 ("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs)); 2257 2258 if (cmd == RTM_ADD) { 2259 rt_addrmsg(cmd, ifa, fibnum); 2260 if (rt != NULL) 2261 rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum); 2262 } else { 2263 if (rt != NULL) 2264 rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum); 2265 rt_addrmsg(cmd, ifa, fibnum); 2266 } 2267 } 2268 2269