route.c revision 1.147
1 /* $NetBSD: route.c,v 1.147 2015/08/13 07:59:05 ozaki-r Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Kevin M. Lahey of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the project nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 */ 61 62 /* 63 * Copyright (c) 1980, 1986, 1991, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * Redistribution and use in source and binary forms, with or without 67 * modification, are permitted provided that the following conditions 68 * are met: 69 * 1. Redistributions of source code must retain the above copyright 70 * notice, this list of conditions and the following disclaimer. 71 * 2. Redistributions in binary form must reproduce the above copyright 72 * notice, this list of conditions and the following disclaimer in the 73 * documentation and/or other materials provided with the distribution. 74 * 3. Neither the name of the University nor the names of its contributors 75 * may be used to endorse or promote products derived from this software 76 * without specific prior written permission. 77 * 78 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 79 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 80 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 81 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 82 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 83 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 84 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 85 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 86 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 87 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 88 * SUCH DAMAGE. 89 * 90 * @(#)route.c 8.3 (Berkeley) 1/9/95 91 */ 92 93 #include "opt_inet.h" 94 #include "opt_route.h" 95 96 #include <sys/cdefs.h> 97 __KERNEL_RCSID(0, "$NetBSD: route.c,v 1.147 2015/08/13 07:59:05 ozaki-r Exp $"); 98 99 #include <sys/param.h> 100 #ifdef RTFLUSH_DEBUG 101 #include <sys/sysctl.h> 102 #endif 103 #include <sys/systm.h> 104 #include <sys/callout.h> 105 #include <sys/proc.h> 106 #include <sys/mbuf.h> 107 #include <sys/socket.h> 108 #include <sys/socketvar.h> 109 #include <sys/domain.h> 110 #include <sys/protosw.h> 111 #include <sys/kernel.h> 112 #include <sys/ioctl.h> 113 #include <sys/pool.h> 114 #include <sys/kauth.h> 115 116 #include <net/if.h> 117 #include <net/if_dl.h> 118 #include <net/route.h> 119 120 #include <netinet/in.h> 121 #include <netinet/in_var.h> 122 123 #ifdef RTFLUSH_DEBUG 124 #define rtcache_debug() __predict_false(_rtcache_debug) 125 #else /* RTFLUSH_DEBUG */ 126 #define rtcache_debug() 0 127 #endif /* RTFLUSH_DEBUG */ 128 129 struct rtstat rtstat; 130 131 int rttrash; /* routes not in table but not freed */ 132 133 struct pool rtentry_pool; 134 struct pool rttimer_pool; 135 136 struct callout rt_timer_ch; /* callout for rt_timer_timer() */ 137 138 #ifdef RTFLUSH_DEBUG 139 static int _rtcache_debug = 0; 140 #endif /* RTFLUSH_DEBUG */ 141 142 static kauth_listener_t route_listener; 143 144 static int rtdeletemsg(struct rtentry *); 145 static int rtflushclone1(struct rtentry *, void *); 146 static void rtflushclone(sa_family_t family, struct rtentry *); 147 static void rtflushall(int); 148 149 static void rt_maskedcopy(const struct sockaddr *, 150 struct sockaddr *, const struct sockaddr *); 151 152 static void rtcache_clear(struct route *); 153 static void rtcache_invalidate(struct dom_rtlist *); 154 155 #ifdef RTFLUSH_DEBUG 156 static void sysctl_net_rtcache_setup(struct sysctllog **); 157 static void 158 sysctl_net_rtcache_setup(struct sysctllog **clog) 159 { 160 const struct sysctlnode *rnode; 161 162 if (sysctl_createv(clog, 0, NULL, &rnode, CTLFLAG_PERMANENT, 163 CTLTYPE_NODE, 164 "rtcache", SYSCTL_DESCR("Route cache related settings"), 165 NULL, 0, NULL, 0, CTL_NET, CTL_CREATE, CTL_EOL) != 0) 166 return; 167 if (sysctl_createv(clog, 0, &rnode, &rnode, 168 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, 169 "debug", SYSCTL_DESCR("Debug route caches"), 170 NULL, 0, &_rtcache_debug, 0, CTL_CREATE, CTL_EOL) != 0) 171 return; 172 } 173 #endif /* RTFLUSH_DEBUG */ 174 175 static inline void 176 rt_destroy(struct rtentry *rt) 177 { 178 if (rt->_rt_key != NULL) 179 sockaddr_free(rt->_rt_key); 180 if (rt->rt_gateway != NULL) 181 sockaddr_free(rt->rt_gateway); 182 if (rt_gettag(rt) != NULL) 183 sockaddr_free(rt_gettag(rt)); 184 rt->_rt_key = rt->rt_gateway = rt->rt_tag = NULL; 185 } 186 187 static inline const struct sockaddr * 188 rt_setkey(struct rtentry *rt, const struct sockaddr *key, int flags) 189 { 190 if (rt->_rt_key == key) 191 goto out; 192 193 if (rt->_rt_key != NULL) 194 sockaddr_free(rt->_rt_key); 195 rt->_rt_key = sockaddr_dup(key, flags); 196 out: 197 rt->rt_nodes->rn_key = (const char *)rt->_rt_key; 198 return rt->_rt_key; 199 } 200 201 struct ifaddr * 202 rt_get_ifa(struct rtentry *rt) 203 { 204 struct ifaddr *ifa; 205 206 if ((ifa = rt->rt_ifa) == NULL) 207 return ifa; 208 else if (ifa->ifa_getifa == NULL) 209 return ifa; 210 #if 0 211 else if (ifa->ifa_seqno != NULL && *ifa->ifa_seqno == rt->rt_ifa_seqno) 212 return ifa; 213 #endif 214 else { 215 ifa = (*ifa->ifa_getifa)(ifa, rt_getkey(rt)); 216 if (ifa == NULL) 217 return NULL; 218 rt_replace_ifa(rt, ifa); 219 return ifa; 220 } 221 } 222 223 static void 224 rt_set_ifa1(struct rtentry *rt, struct ifaddr *ifa) 225 { 226 rt->rt_ifa = ifa; 227 if (ifa->ifa_seqno != NULL) 228 rt->rt_ifa_seqno = *ifa->ifa_seqno; 229 } 230 231 /* 232 * Is this route the connected route for the ifa? 233 */ 234 static int 235 rt_ifa_connected(const struct rtentry *rt, const struct ifaddr *ifa) 236 { 237 const struct sockaddr *key, *dst, *odst; 238 struct sockaddr_storage maskeddst; 239 240 key = rt_getkey(rt); 241 dst = rt->rt_flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr; 242 if (dst == NULL || 243 dst->sa_family != key->sa_family || 244 dst->sa_len != key->sa_len) 245 return 0; 246 if ((rt->rt_flags & RTF_HOST) == 0 && ifa->ifa_netmask) { 247 odst = dst; 248 dst = (struct sockaddr *)&maskeddst; 249 rt_maskedcopy(odst, (struct sockaddr *)&maskeddst, 250 ifa->ifa_netmask); 251 } 252 return (memcmp(dst, key, dst->sa_len) == 0); 253 } 254 255 void 256 rt_replace_ifa(struct rtentry *rt, struct ifaddr *ifa) 257 { 258 if (rt->rt_ifa && 259 rt->rt_ifa != ifa && 260 rt->rt_ifa->ifa_flags & IFA_ROUTE && 261 rt_ifa_connected(rt, rt->rt_ifa)) 262 { 263 RT_DPRINTF("rt->_rt_key = %p, ifa = %p, " 264 "replace deleted IFA_ROUTE\n", 265 (void *)rt->_rt_key, (void *)rt->rt_ifa); 266 rt->rt_ifa->ifa_flags &= ~IFA_ROUTE; 267 if (rt_ifa_connected(rt, ifa)) { 268 RT_DPRINTF("rt->_rt_key = %p, ifa = %p, " 269 "replace added IFA_ROUTE\n", 270 (void *)rt->_rt_key, (void *)ifa); 271 ifa->ifa_flags |= IFA_ROUTE; 272 } 273 } 274 275 ifaref(ifa); 276 ifafree(rt->rt_ifa); 277 rt_set_ifa1(rt, ifa); 278 } 279 280 static void 281 rt_set_ifa(struct rtentry *rt, struct ifaddr *ifa) 282 { 283 ifaref(ifa); 284 rt_set_ifa1(rt, ifa); 285 } 286 287 static int 288 route_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 289 void *arg0, void *arg1, void *arg2, void *arg3) 290 { 291 struct rt_msghdr *rtm; 292 int result; 293 294 result = KAUTH_RESULT_DEFER; 295 rtm = arg1; 296 297 if (action != KAUTH_NETWORK_ROUTE) 298 return result; 299 300 if (rtm->rtm_type == RTM_GET) 301 result = KAUTH_RESULT_ALLOW; 302 303 return result; 304 } 305 306 void 307 rt_init(void) 308 { 309 310 #ifdef RTFLUSH_DEBUG 311 sysctl_net_rtcache_setup(NULL); 312 #endif 313 314 pool_init(&rtentry_pool, sizeof(struct rtentry), 0, 0, 0, "rtentpl", 315 NULL, IPL_SOFTNET); 316 pool_init(&rttimer_pool, sizeof(struct rttimer), 0, 0, 0, "rttmrpl", 317 NULL, IPL_SOFTNET); 318 319 rn_init(); /* initialize all zeroes, all ones, mask table */ 320 rtbl_init(); 321 322 route_listener = kauth_listen_scope(KAUTH_SCOPE_NETWORK, 323 route_listener_cb, NULL); 324 } 325 326 static void 327 rtflushall(int family) 328 { 329 struct domain *dom; 330 331 if (rtcache_debug()) 332 printf("%s: enter\n", __func__); 333 334 if ((dom = pffinddomain(family)) == NULL) 335 return; 336 337 rtcache_invalidate(&dom->dom_rtcache); 338 } 339 340 static void 341 rtcache(struct route *ro) 342 { 343 struct domain *dom; 344 345 rtcache_invariants(ro); 346 KASSERT(ro->_ro_rt != NULL); 347 KASSERT(ro->ro_invalid == false); 348 KASSERT(rtcache_getdst(ro) != NULL); 349 350 if ((dom = pffinddomain(rtcache_getdst(ro)->sa_family)) == NULL) 351 return; 352 353 LIST_INSERT_HEAD(&dom->dom_rtcache, ro, ro_rtcache_next); 354 rtcache_invariants(ro); 355 } 356 357 /* 358 * Packet routing routines. If success, refcnt of a returned rtentry 359 * will be incremented. The caller has to rtfree it by itself. 360 */ 361 struct rtentry * 362 rtalloc1(const struct sockaddr *dst, int report) 363 { 364 rtbl_t *rtbl = rt_gettable(dst->sa_family); 365 struct rtentry *rt; 366 struct rtentry *newrt = NULL; 367 struct rt_addrinfo info; 368 int s = splsoftnet(), err = 0, msgtype = RTM_MISS; 369 370 if (rtbl != NULL && (rt = rt_matchaddr(rtbl, dst)) != NULL) { 371 newrt = rt; 372 if (report && (rt->rt_flags & RTF_CLONING)) { 373 err = rtrequest(RTM_RESOLVE, dst, NULL, NULL, 0, 374 &newrt); 375 if (err) { 376 newrt = rt; 377 rt->rt_refcnt++; 378 goto miss; 379 } 380 KASSERT(newrt != NULL); 381 rt = newrt; 382 rt->rt_refcnt++; 383 if (rt->rt_flags & RTF_XRESOLVE) { 384 msgtype = RTM_RESOLVE; 385 goto miss; 386 } 387 /* Inform listeners of the new route */ 388 memset(&info, 0, sizeof(info)); 389 info.rti_info[RTAX_DST] = rt_getkey(rt); 390 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 391 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 392 if (rt->rt_ifp != NULL) { 393 info.rti_info[RTAX_IFP] = 394 rt->rt_ifp->if_dl->ifa_addr; 395 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 396 } 397 rt_missmsg(RTM_ADD, &info, rt->rt_flags, 0); 398 } else 399 rt->rt_refcnt++; 400 } else { 401 rtstat.rts_unreach++; 402 miss: if (report) { 403 memset((void *)&info, 0, sizeof(info)); 404 info.rti_info[RTAX_DST] = dst; 405 rt_missmsg(msgtype, &info, 0, err); 406 } 407 } 408 splx(s); 409 return newrt; 410 } 411 412 void 413 rtfree(struct rtentry *rt) 414 { 415 struct ifaddr *ifa; 416 417 KASSERT(rt != NULL); 418 KASSERT(rt->rt_refcnt > 0); 419 420 rt->rt_refcnt--; 421 if (rt->rt_refcnt == 0 && (rt->rt_flags & RTF_UP) == 0) { 422 rt_assert_inactive(rt); 423 rttrash--; 424 rt_timer_remove_all(rt, 0); 425 ifa = rt->rt_ifa; 426 rt->rt_ifa = NULL; 427 ifafree(ifa); 428 rt->rt_ifp = NULL; 429 rt_destroy(rt); 430 pool_put(&rtentry_pool, rt); 431 } 432 } 433 434 /* 435 * Force a routing table entry to the specified 436 * destination to go through the given gateway. 437 * Normally called as a result of a routing redirect 438 * message from the network layer. 439 * 440 * N.B.: must be called at splsoftnet 441 */ 442 void 443 rtredirect(const struct sockaddr *dst, const struct sockaddr *gateway, 444 const struct sockaddr *netmask, int flags, const struct sockaddr *src, 445 struct rtentry **rtp) 446 { 447 struct rtentry *rt; 448 int error = 0; 449 uint64_t *stat = NULL; 450 struct rt_addrinfo info; 451 struct ifaddr *ifa; 452 453 /* verify the gateway is directly reachable */ 454 if ((ifa = ifa_ifwithnet(gateway)) == NULL) { 455 error = ENETUNREACH; 456 goto out; 457 } 458 rt = rtalloc1(dst, 0); 459 /* 460 * If the redirect isn't from our current router for this dst, 461 * it's either old or wrong. If it redirects us to ourselves, 462 * we have a routing loop, perhaps as a result of an interface 463 * going down recently. 464 */ 465 if (!(flags & RTF_DONE) && rt && 466 (sockaddr_cmp(src, rt->rt_gateway) != 0 || rt->rt_ifa != ifa)) 467 error = EINVAL; 468 else if (ifa_ifwithaddr(gateway)) 469 error = EHOSTUNREACH; 470 if (error) 471 goto done; 472 /* 473 * Create a new entry if we just got back a wildcard entry 474 * or the lookup failed. This is necessary for hosts 475 * which use routing redirects generated by smart gateways 476 * to dynamically build the routing tables. 477 */ 478 if (rt == NULL || (rt_mask(rt) && rt_mask(rt)->sa_len < 2)) 479 goto create; 480 /* 481 * Don't listen to the redirect if it's 482 * for a route to an interface. 483 */ 484 if (rt->rt_flags & RTF_GATEWAY) { 485 if (((rt->rt_flags & RTF_HOST) == 0) && (flags & RTF_HOST)) { 486 /* 487 * Changing from route to net => route to host. 488 * Create new route, rather than smashing route to net. 489 */ 490 create: 491 if (rt != NULL) 492 rtfree(rt); 493 flags |= RTF_GATEWAY | RTF_DYNAMIC; 494 memset(&info, 0, sizeof(info)); 495 info.rti_info[RTAX_DST] = dst; 496 info.rti_info[RTAX_GATEWAY] = gateway; 497 info.rti_info[RTAX_NETMASK] = netmask; 498 info.rti_ifa = ifa; 499 info.rti_flags = flags; 500 rt = NULL; 501 error = rtrequest1(RTM_ADD, &info, &rt); 502 if (rt != NULL) 503 flags = rt->rt_flags; 504 stat = &rtstat.rts_dynamic; 505 } else { 506 /* 507 * Smash the current notion of the gateway to 508 * this destination. Should check about netmask!!! 509 */ 510 rt->rt_flags |= RTF_MODIFIED; 511 flags |= RTF_MODIFIED; 512 stat = &rtstat.rts_newgateway; 513 rt_setgate(rt, gateway); 514 } 515 } else 516 error = EHOSTUNREACH; 517 done: 518 if (rt) { 519 if (rtp != NULL && !error) 520 *rtp = rt; 521 else 522 rtfree(rt); 523 } 524 out: 525 if (error) 526 rtstat.rts_badredirect++; 527 else if (stat != NULL) 528 (*stat)++; 529 memset(&info, 0, sizeof(info)); 530 info.rti_info[RTAX_DST] = dst; 531 info.rti_info[RTAX_GATEWAY] = gateway; 532 info.rti_info[RTAX_NETMASK] = netmask; 533 info.rti_info[RTAX_AUTHOR] = src; 534 rt_missmsg(RTM_REDIRECT, &info, flags, error); 535 } 536 537 /* 538 * Delete a route and generate a message. 539 * It doesn't free a passed rt. 540 */ 541 static int 542 rtdeletemsg(struct rtentry *rt) 543 { 544 int error; 545 struct rt_addrinfo info; 546 struct rtentry *retrt; 547 548 /* 549 * Request the new route so that the entry is not actually 550 * deleted. That will allow the information being reported to 551 * be accurate (and consistent with route_output()). 552 */ 553 memset(&info, 0, sizeof(info)); 554 info.rti_info[RTAX_DST] = rt_getkey(rt); 555 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 556 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 557 info.rti_flags = rt->rt_flags; 558 error = rtrequest1(RTM_DELETE, &info, &retrt); 559 560 rt_missmsg(RTM_DELETE, &info, info.rti_flags, error); 561 562 if (error == 0) 563 rtfree(retrt); 564 return error; 565 } 566 567 static int 568 rtflushclone1(struct rtentry *rt, void *arg) 569 { 570 struct rtentry *parent; 571 572 parent = (struct rtentry *)arg; 573 if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent == parent) 574 rtdeletemsg(rt); 575 return 0; 576 } 577 578 static void 579 rtflushclone(sa_family_t family, struct rtentry *parent) 580 { 581 582 #ifdef DIAGNOSTIC 583 if (!parent || (parent->rt_flags & RTF_CLONING) == 0) 584 panic("rtflushclone: called with a non-cloning route"); 585 #endif 586 rt_walktree(family, rtflushclone1, (void *)parent); 587 } 588 589 struct ifaddr * 590 ifa_ifwithroute(int flags, const struct sockaddr *dst, 591 const struct sockaddr *gateway) 592 { 593 struct ifaddr *ifa; 594 if ((flags & RTF_GATEWAY) == 0) { 595 /* 596 * If we are adding a route to an interface, 597 * and the interface is a pt to pt link 598 * we should search for the destination 599 * as our clue to the interface. Otherwise 600 * we can use the local address. 601 */ 602 ifa = NULL; 603 if ((flags & RTF_HOST) && gateway->sa_family != AF_LINK) 604 ifa = ifa_ifwithdstaddr(dst); 605 if (ifa == NULL) 606 ifa = ifa_ifwithaddr(gateway); 607 } else { 608 /* 609 * If we are adding a route to a remote net 610 * or host, the gateway may still be on the 611 * other end of a pt to pt link. 612 */ 613 ifa = ifa_ifwithdstaddr(gateway); 614 } 615 if (ifa == NULL) 616 ifa = ifa_ifwithnet(gateway); 617 if (ifa == NULL) { 618 struct rtentry *rt = rtalloc1(dst, 0); 619 if (rt == NULL) 620 return NULL; 621 ifa = rt->rt_ifa; 622 rtfree(rt); 623 if (ifa == NULL) 624 return NULL; 625 } 626 if (ifa->ifa_addr->sa_family != dst->sa_family) { 627 struct ifaddr *oifa = ifa; 628 ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp); 629 if (ifa == NULL) 630 ifa = oifa; 631 } 632 return ifa; 633 } 634 635 /* 636 * If it suceeds and ret_nrt isn't NULL, refcnt of ret_nrt is incremented. 637 * The caller has to rtfree it by itself. 638 */ 639 int 640 rtrequest(int req, const struct sockaddr *dst, const struct sockaddr *gateway, 641 const struct sockaddr *netmask, int flags, struct rtentry **ret_nrt) 642 { 643 struct rt_addrinfo info; 644 645 memset(&info, 0, sizeof(info)); 646 info.rti_flags = flags; 647 info.rti_info[RTAX_DST] = dst; 648 info.rti_info[RTAX_GATEWAY] = gateway; 649 info.rti_info[RTAX_NETMASK] = netmask; 650 return rtrequest1(req, &info, ret_nrt); 651 } 652 653 /* 654 * It's a utility function to add/remove a route to/from the routing table 655 * and tell user processes the addition/removal on success. 656 */ 657 int 658 rtrequest_newmsg(const int req, const struct sockaddr *dst, 659 const struct sockaddr *gateway, const struct sockaddr *netmask, 660 const int flags) 661 { 662 int error; 663 struct rtentry *ret_nrt = NULL; 664 665 KASSERT(req == RTM_ADD || req == RTM_DELETE); 666 667 error = rtrequest(req, dst, gateway, netmask, flags, &ret_nrt); 668 if (error != 0) 669 return error; 670 671 KASSERT(ret_nrt != NULL); 672 673 rt_newmsg(req, ret_nrt); /* tell user process */ 674 rtfree(ret_nrt); 675 676 return 0; 677 } 678 679 int 680 rt_getifa(struct rt_addrinfo *info) 681 { 682 struct ifaddr *ifa; 683 const struct sockaddr *dst = info->rti_info[RTAX_DST]; 684 const struct sockaddr *gateway = info->rti_info[RTAX_GATEWAY]; 685 const struct sockaddr *ifaaddr = info->rti_info[RTAX_IFA]; 686 const struct sockaddr *ifpaddr = info->rti_info[RTAX_IFP]; 687 int flags = info->rti_flags; 688 689 /* 690 * ifp may be specified by sockaddr_dl when protocol address 691 * is ambiguous 692 */ 693 if (info->rti_ifp == NULL && ifpaddr != NULL 694 && ifpaddr->sa_family == AF_LINK && 695 (ifa = ifa_ifwithnet(ifpaddr)) != NULL) 696 info->rti_ifp = ifa->ifa_ifp; 697 if (info->rti_ifa == NULL && ifaaddr != NULL) 698 info->rti_ifa = ifa_ifwithaddr(ifaaddr); 699 if (info->rti_ifa == NULL) { 700 const struct sockaddr *sa; 701 702 sa = ifaaddr != NULL ? ifaaddr : 703 (gateway != NULL ? gateway : dst); 704 if (sa != NULL && info->rti_ifp != NULL) 705 info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp); 706 else if (dst != NULL && gateway != NULL) 707 info->rti_ifa = ifa_ifwithroute(flags, dst, gateway); 708 else if (sa != NULL) 709 info->rti_ifa = ifa_ifwithroute(flags, sa, sa); 710 } 711 if ((ifa = info->rti_ifa) == NULL) 712 return ENETUNREACH; 713 if (ifa->ifa_getifa != NULL) { 714 info->rti_ifa = ifa = (*ifa->ifa_getifa)(ifa, dst); 715 if (ifa == NULL) 716 return ENETUNREACH; 717 } 718 if (info->rti_ifp == NULL) 719 info->rti_ifp = ifa->ifa_ifp; 720 return 0; 721 } 722 723 /* 724 * If it suceeds and ret_nrt isn't NULL, refcnt of ret_nrt is incremented. 725 * The caller has to rtfree it by itself. 726 */ 727 int 728 rtrequest1(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt) 729 { 730 int s = splsoftnet(); 731 int error = 0, rc; 732 struct rtentry *rt, *crt; 733 rtbl_t *rtbl; 734 struct ifaddr *ifa, *ifa2; 735 struct sockaddr_storage maskeddst; 736 const struct sockaddr *dst = info->rti_info[RTAX_DST]; 737 const struct sockaddr *gateway = info->rti_info[RTAX_GATEWAY]; 738 const struct sockaddr *netmask = info->rti_info[RTAX_NETMASK]; 739 int flags = info->rti_flags; 740 #define senderr(x) { error = x ; goto bad; } 741 742 if ((rtbl = rt_gettable(dst->sa_family)) == NULL) 743 senderr(ESRCH); 744 if (flags & RTF_HOST) 745 netmask = NULL; 746 switch (req) { 747 case RTM_DELETE: 748 if (netmask) { 749 rt_maskedcopy(dst, (struct sockaddr *)&maskeddst, 750 netmask); 751 dst = (struct sockaddr *)&maskeddst; 752 } 753 if ((rt = rt_lookup(rtbl, dst, netmask)) == NULL) 754 senderr(ESRCH); 755 if ((rt->rt_flags & RTF_CLONING) != 0) { 756 /* clean up any cloned children */ 757 rtflushclone(dst->sa_family, rt); 758 } 759 if ((rt = rt_deladdr(rtbl, dst, netmask)) == NULL) 760 senderr(ESRCH); 761 if (rt->rt_gwroute) { 762 rtfree(rt->rt_gwroute); 763 rt->rt_gwroute = NULL; 764 } 765 if (rt->rt_parent) { 766 rt->rt_parent->rt_refcnt--; 767 rt->rt_parent = NULL; 768 } 769 rt->rt_flags &= ~RTF_UP; 770 if ((ifa = rt->rt_ifa)) { 771 if (ifa->ifa_flags & IFA_ROUTE && 772 rt_ifa_connected(rt, ifa)) { 773 RT_DPRINTF("rt->_rt_key = %p, ifa = %p, " 774 "deleted IFA_ROUTE\n", 775 (void *)rt->_rt_key, (void *)ifa); 776 ifa->ifa_flags &= ~IFA_ROUTE; 777 } 778 if (ifa->ifa_rtrequest) 779 ifa->ifa_rtrequest(RTM_DELETE, rt, info); 780 } 781 rttrash++; 782 if (ret_nrt) { 783 *ret_nrt = rt; 784 rt->rt_refcnt++; 785 } else if (rt->rt_refcnt <= 0) { 786 /* Adjust the refcount */ 787 rt->rt_refcnt++; 788 rtfree(rt); 789 } 790 break; 791 792 case RTM_RESOLVE: 793 if (ret_nrt == NULL || (rt = *ret_nrt) == NULL) 794 senderr(EINVAL); 795 if ((rt->rt_flags & RTF_CLONING) == 0) 796 senderr(EINVAL); 797 ifa = rt->rt_ifa; 798 flags = rt->rt_flags & ~(RTF_CLONING | RTF_STATIC); 799 flags |= RTF_CLONED; 800 gateway = rt->rt_gateway; 801 flags |= RTF_HOST; 802 goto makeroute; 803 804 case RTM_ADD: 805 if (info->rti_ifa == NULL && (error = rt_getifa(info))) 806 senderr(error); 807 ifa = info->rti_ifa; 808 makeroute: 809 /* Already at splsoftnet() so pool_get/pool_put are safe */ 810 rt = pool_get(&rtentry_pool, PR_NOWAIT); 811 if (rt == NULL) 812 senderr(ENOBUFS); 813 memset(rt, 0, sizeof(*rt)); 814 rt->rt_flags = RTF_UP | flags; 815 LIST_INIT(&rt->rt_timer); 816 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 817 if (rt_setkey(rt, dst, M_NOWAIT) == NULL || 818 rt_setgate(rt, gateway) != 0) { 819 pool_put(&rtentry_pool, rt); 820 senderr(ENOBUFS); 821 } 822 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 823 if (netmask) { 824 rt_maskedcopy(dst, (struct sockaddr *)&maskeddst, 825 netmask); 826 rt_setkey(rt, (struct sockaddr *)&maskeddst, M_NOWAIT); 827 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 828 } else { 829 rt_setkey(rt, dst, M_NOWAIT); 830 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 831 } 832 rt_set_ifa(rt, ifa); 833 if (info->rti_info[RTAX_TAG] != NULL) 834 rt_settag(rt, info->rti_info[RTAX_TAG]); 835 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 836 if (info->rti_info[RTAX_IFP] != NULL && 837 (ifa2 = ifa_ifwithnet(info->rti_info[RTAX_IFP])) != NULL && 838 ifa2->ifa_ifp != NULL) 839 rt->rt_ifp = ifa2->ifa_ifp; 840 else 841 rt->rt_ifp = ifa->ifa_ifp; 842 if (req == RTM_RESOLVE) { 843 rt->rt_rmx = (*ret_nrt)->rt_rmx; /* copy metrics */ 844 rt->rt_parent = *ret_nrt; 845 rt->rt_parent->rt_refcnt++; 846 } 847 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 848 rc = rt_addaddr(rtbl, rt, netmask); 849 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 850 if (rc != 0 && (crt = rtalloc1(rt_getkey(rt), 0)) != NULL) { 851 /* overwrite cloned route */ 852 if ((crt->rt_flags & RTF_CLONED) != 0) { 853 rtdeletemsg(crt); 854 rc = rt_addaddr(rtbl, rt, netmask); 855 } 856 rtfree(crt); 857 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 858 } 859 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 860 if (rc != 0) { 861 ifafree(ifa); 862 if ((rt->rt_flags & RTF_CLONED) != 0 && rt->rt_parent) 863 rtfree(rt->rt_parent); 864 if (rt->rt_gwroute) 865 rtfree(rt->rt_gwroute); 866 rt_destroy(rt); 867 pool_put(&rtentry_pool, rt); 868 senderr(rc); 869 } 870 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 871 if (ifa->ifa_rtrequest) 872 ifa->ifa_rtrequest(req, rt, info); 873 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 874 if (ret_nrt) { 875 *ret_nrt = rt; 876 rt->rt_refcnt++; 877 } 878 if ((rt->rt_flags & RTF_CLONING) != 0) { 879 /* clean up any cloned children */ 880 rtflushclone(dst->sa_family, rt); 881 } 882 rtflushall(dst->sa_family); 883 break; 884 case RTM_GET: 885 if (netmask != NULL) { 886 rt_maskedcopy(dst, (struct sockaddr *)&maskeddst, 887 netmask); 888 dst = (struct sockaddr *)&maskeddst; 889 } 890 if ((rt = rt_lookup(rtbl, dst, netmask)) == NULL) 891 senderr(ESRCH); 892 if (ret_nrt != NULL) { 893 *ret_nrt = rt; 894 rt->rt_refcnt++; 895 } 896 break; 897 } 898 bad: 899 splx(s); 900 return error; 901 } 902 903 int 904 rt_setgate(struct rtentry *rt, const struct sockaddr *gate) 905 { 906 KASSERT(rt != rt->rt_gwroute); 907 908 KASSERT(rt->_rt_key != NULL); 909 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 910 911 if (rt->rt_gwroute) { 912 rtfree(rt->rt_gwroute); 913 rt->rt_gwroute = NULL; 914 } 915 KASSERT(rt->_rt_key != NULL); 916 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 917 if (rt->rt_gateway != NULL) 918 sockaddr_free(rt->rt_gateway); 919 KASSERT(rt->_rt_key != NULL); 920 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 921 if ((rt->rt_gateway = sockaddr_dup(gate, M_ZERO | M_NOWAIT)) == NULL) 922 return ENOMEM; 923 KASSERT(rt->_rt_key != NULL); 924 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 925 926 if (rt->rt_flags & RTF_GATEWAY) { 927 KASSERT(rt->_rt_key != NULL); 928 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 929 rt->rt_gwroute = rtalloc1(gate, 1); 930 /* 931 * If we switched gateways, grab the MTU from the new 932 * gateway route if the current MTU, if the current MTU is 933 * greater than the MTU of gateway. 934 * Note that, if the MTU of gateway is 0, we will reset the 935 * MTU of the route to run PMTUD again from scratch. XXX 936 */ 937 KASSERT(rt->_rt_key != NULL); 938 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 939 if (rt->rt_gwroute 940 && !(rt->rt_rmx.rmx_locks & RTV_MTU) 941 && rt->rt_rmx.rmx_mtu 942 && rt->rt_rmx.rmx_mtu > rt->rt_gwroute->rt_rmx.rmx_mtu) { 943 rt->rt_rmx.rmx_mtu = rt->rt_gwroute->rt_rmx.rmx_mtu; 944 } 945 } 946 KASSERT(rt->_rt_key != NULL); 947 RT_DPRINTF("rt->_rt_key = %p\n", (void *)rt->_rt_key); 948 return 0; 949 } 950 951 static void 952 rt_maskedcopy(const struct sockaddr *src, struct sockaddr *dst, 953 const struct sockaddr *netmask) 954 { 955 const char *netmaskp = &netmask->sa_data[0], 956 *srcp = &src->sa_data[0]; 957 char *dstp = &dst->sa_data[0]; 958 const char *maskend = (char *)dst + MIN(netmask->sa_len, src->sa_len); 959 const char *srcend = (char *)dst + src->sa_len; 960 961 dst->sa_len = src->sa_len; 962 dst->sa_family = src->sa_family; 963 964 while (dstp < maskend) 965 *dstp++ = *srcp++ & *netmaskp++; 966 if (dstp < srcend) 967 memset(dstp, 0, (size_t)(srcend - dstp)); 968 } 969 970 /* 971 * Inform the routing socket of a route change. 972 */ 973 void 974 rt_newmsg(int cmd, struct rtentry *rt) 975 { 976 struct rt_addrinfo info; 977 978 memset((void *)&info, 0, sizeof(info)); 979 info.rti_info[RTAX_DST] = rt_getkey(rt); 980 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 981 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 982 if (rt->rt_ifp) { 983 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_dl->ifa_addr; 984 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr; 985 } 986 987 rt_missmsg(cmd, &info, rt->rt_flags, 0); 988 } 989 990 /* 991 * Set up or tear down a routing table entry, normally 992 * for an interface. 993 */ 994 int 995 rtinit(struct ifaddr *ifa, int cmd, int flags) 996 { 997 struct rtentry *rt; 998 struct sockaddr *dst, *odst; 999 struct sockaddr_storage maskeddst; 1000 struct rtentry *nrt = NULL; 1001 int error; 1002 struct rt_addrinfo info; 1003 struct sockaddr_dl *sdl; 1004 const struct sockaddr_dl *ifsdl; 1005 1006 dst = flags & RTF_HOST ? ifa->ifa_dstaddr : ifa->ifa_addr; 1007 if (cmd == RTM_DELETE) { 1008 if ((flags & RTF_HOST) == 0 && ifa->ifa_netmask) { 1009 /* Delete subnet route for this interface */ 1010 odst = dst; 1011 dst = (struct sockaddr *)&maskeddst; 1012 rt_maskedcopy(odst, dst, ifa->ifa_netmask); 1013 } 1014 if ((rt = rtalloc1(dst, 0)) != NULL) { 1015 if (rt->rt_ifa != ifa) { 1016 rtfree(rt); 1017 return (flags & RTF_HOST) ? EHOSTUNREACH 1018 : ENETUNREACH; 1019 } 1020 rtfree(rt); 1021 } 1022 } 1023 memset(&info, 0, sizeof(info)); 1024 info.rti_ifa = ifa; 1025 info.rti_flags = flags | ifa->ifa_flags; 1026 info.rti_info[RTAX_DST] = dst; 1027 info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr; 1028 /* 1029 * XXX here, it seems that we are assuming that ifa_netmask is NULL 1030 * for RTF_HOST. bsdi4 passes NULL explicitly (via intermediate 1031 * variable) when RTF_HOST is 1. still not sure if i can safely 1032 * change it to meet bsdi4 behavior. 1033 */ 1034 if (cmd != RTM_LLINFO_UPD) 1035 info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask; 1036 error = rtrequest1((cmd == RTM_LLINFO_UPD) ? RTM_GET : cmd, &info, 1037 &nrt); 1038 if (error != 0 || (rt = nrt) == NULL) 1039 return error; 1040 1041 switch (cmd) { 1042 case RTM_DELETE: 1043 rt_newmsg(cmd, rt); 1044 break; 1045 case RTM_LLINFO_UPD: 1046 RT_DPRINTF("%s: updating%s\n", __func__, 1047 ((rt->rt_flags & RTF_LLINFO) == 0) ? " (no llinfo)" : ""); 1048 1049 ifsdl = ifa->ifa_ifp->if_sadl; 1050 1051 if ((rt->rt_flags & RTF_LLINFO) != 0 && 1052 (sdl = satosdl(rt->rt_gateway)) != NULL && 1053 sdl->sdl_family == AF_LINK && 1054 sockaddr_dl_setaddr(sdl, sdl->sdl_len, CLLADDR(ifsdl), 1055 ifa->ifa_ifp->if_addrlen) == NULL) { 1056 error = EINVAL; 1057 break; 1058 } 1059 1060 if (cmd == RTM_LLINFO_UPD && ifa->ifa_rtrequest != NULL) 1061 ifa->ifa_rtrequest(RTM_LLINFO_UPD, rt, &info); 1062 rt_newmsg(RTM_CHANGE, rt); 1063 break; 1064 case RTM_ADD: 1065 if (rt->rt_ifa != ifa) { 1066 printf("rtinit: wrong ifa (%p) was (%p)\n", ifa, 1067 rt->rt_ifa); 1068 if (rt->rt_ifa->ifa_rtrequest != NULL) { 1069 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, 1070 &info); 1071 } 1072 rt_replace_ifa(rt, ifa); 1073 rt->rt_ifp = ifa->ifa_ifp; 1074 if (ifa->ifa_rtrequest != NULL) 1075 ifa->ifa_rtrequest(RTM_ADD, rt, &info); 1076 } 1077 rt_newmsg(cmd, rt); 1078 break; 1079 } 1080 rtfree(rt); 1081 return error; 1082 } 1083 1084 static const struct in_addr inmask32 = {.s_addr = INADDR_BROADCAST}; 1085 1086 /* Subroutine for rt_ifa_addlocal() and rt_ifa_remlocal() */ 1087 static int 1088 rt_ifa_localrequest(int cmd, struct ifaddr *ifa) 1089 { 1090 struct sockaddr *all1_sa; 1091 struct sockaddr_in all1_sin; 1092 #ifdef INET6 1093 struct sockaddr_in6 all1_sin6; 1094 #endif 1095 struct rtentry *nrt = NULL; 1096 int flags, e; 1097 1098 switch(ifa->ifa_addr->sa_family) { 1099 case AF_INET: 1100 sockaddr_in_init(&all1_sin, &inmask32, 0); 1101 all1_sa = (struct sockaddr *)&all1_sin; 1102 break; 1103 #ifdef INET6 1104 case AF_INET6: 1105 sockaddr_in6_init(&all1_sin6, &in6mask128, 0, 0, 0); 1106 all1_sa = (struct sockaddr *)&all1_sin6; 1107 break; 1108 #endif 1109 default: 1110 return 0; 1111 } 1112 1113 flags = RTF_UP | RTF_HOST | RTF_LOCAL; 1114 if (!(ifa->ifa_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) 1115 flags |= RTF_LLINFO; 1116 e = rtrequest(cmd, ifa->ifa_addr, ifa->ifa_addr, all1_sa, flags, &nrt); 1117 1118 /* Make sure rt_ifa be equal to IFA, the second argument of the 1119 * function. */ 1120 if (cmd == RTM_ADD && nrt && ifa != nrt->rt_ifa) 1121 rt_replace_ifa(nrt, ifa); 1122 1123 rt_newaddrmsg(cmd, ifa, e, nrt); 1124 if (nrt != NULL) 1125 rtfree(nrt); 1126 1127 return e; 1128 } 1129 1130 /* 1131 * Create a local route entry for the address. 1132 * Announce the addition of the address and the route to the routing socket. 1133 */ 1134 int 1135 rt_ifa_addlocal(struct ifaddr *ifa) 1136 { 1137 struct rtentry *rt; 1138 int e; 1139 1140 /* If there is no loopback entry, allocate one. */ 1141 rt = rtalloc1(ifa->ifa_addr, 0); 1142 if (rt == NULL || (rt->rt_flags & RTF_HOST) == 0 || 1143 (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) 1144 e = rt_ifa_localrequest(RTM_ADD, ifa); 1145 else { 1146 e = 0; 1147 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1148 } 1149 if (rt != NULL) 1150 rtfree(rt); 1151 return e; 1152 } 1153 1154 /* 1155 * Remove the local route entry for the address. 1156 * Announce the removal of the address and the route to the routing socket. 1157 */ 1158 int 1159 rt_ifa_remlocal(struct ifaddr *ifa, struct ifaddr *alt_ifa) 1160 { 1161 struct rtentry *rt; 1162 int e = 0; 1163 1164 rt = rtalloc1(ifa->ifa_addr, 0); 1165 1166 /* 1167 * Before deleting, check if a corresponding loopbacked 1168 * host route surely exists. With this check, we can avoid 1169 * deleting an interface direct route whose destination is 1170 * the same as the address being removed. This can happen 1171 * when removing a subnet-router anycast address on an 1172 * interface attached to a shared medium. 1173 */ 1174 if (rt != NULL && 1175 (rt->rt_flags & RTF_HOST) && 1176 (rt->rt_ifp->if_flags & IFF_LOOPBACK)) 1177 { 1178 /* If we cannot replace the route's ifaddr with the equivalent 1179 * ifaddr of another interface, I believe it is safest to 1180 * delete the route. 1181 */ 1182 if (alt_ifa == NULL) 1183 e = rt_ifa_localrequest(RTM_DELETE, ifa); 1184 else { 1185 rt_replace_ifa(rt, alt_ifa); 1186 rt_newmsg(RTM_CHANGE, rt); 1187 } 1188 } else 1189 rt_newaddrmsg(RTM_DELADDR, ifa, 0, NULL); 1190 if (rt != NULL) 1191 rtfree(rt); 1192 return e; 1193 } 1194 1195 /* 1196 * Route timer routines. These routes allow functions to be called 1197 * for various routes at any time. This is useful in supporting 1198 * path MTU discovery and redirect route deletion. 1199 * 1200 * This is similar to some BSDI internal functions, but it provides 1201 * for multiple queues for efficiency's sake... 1202 */ 1203 1204 LIST_HEAD(, rttimer_queue) rttimer_queue_head; 1205 static int rt_init_done = 0; 1206 1207 #define RTTIMER_CALLOUT(r) do { \ 1208 if (r->rtt_func != NULL) { \ 1209 (*r->rtt_func)(r->rtt_rt, r); \ 1210 } else { \ 1211 rtrequest((int) RTM_DELETE, \ 1212 rt_getkey(r->rtt_rt), \ 1213 0, 0, 0, 0); \ 1214 } \ 1215 } while (/*CONSTCOND*/0) 1216 1217 /* 1218 * Some subtle order problems with domain initialization mean that 1219 * we cannot count on this being run from rt_init before various 1220 * protocol initializations are done. Therefore, we make sure 1221 * that this is run when the first queue is added... 1222 */ 1223 1224 void 1225 rt_timer_init(void) 1226 { 1227 assert(rt_init_done == 0); 1228 1229 LIST_INIT(&rttimer_queue_head); 1230 callout_init(&rt_timer_ch, 0); 1231 callout_reset(&rt_timer_ch, hz, rt_timer_timer, NULL); 1232 rt_init_done = 1; 1233 } 1234 1235 struct rttimer_queue * 1236 rt_timer_queue_create(u_int timeout) 1237 { 1238 struct rttimer_queue *rtq; 1239 1240 if (rt_init_done == 0) 1241 rt_timer_init(); 1242 1243 R_Malloc(rtq, struct rttimer_queue *, sizeof *rtq); 1244 if (rtq == NULL) 1245 return NULL; 1246 memset(rtq, 0, sizeof(*rtq)); 1247 1248 rtq->rtq_timeout = timeout; 1249 TAILQ_INIT(&rtq->rtq_head); 1250 LIST_INSERT_HEAD(&rttimer_queue_head, rtq, rtq_link); 1251 1252 return rtq; 1253 } 1254 1255 void 1256 rt_timer_queue_change(struct rttimer_queue *rtq, long timeout) 1257 { 1258 1259 rtq->rtq_timeout = timeout; 1260 } 1261 1262 void 1263 rt_timer_queue_remove_all(struct rttimer_queue *rtq, int destroy) 1264 { 1265 struct rttimer *r; 1266 1267 while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL) { 1268 LIST_REMOVE(r, rtt_link); 1269 TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next); 1270 if (destroy) 1271 RTTIMER_CALLOUT(r); 1272 /* we are already at splsoftnet */ 1273 pool_put(&rttimer_pool, r); 1274 if (rtq->rtq_count > 0) 1275 rtq->rtq_count--; 1276 else 1277 printf("rt_timer_queue_remove_all: " 1278 "rtq_count reached 0\n"); 1279 } 1280 } 1281 1282 void 1283 rt_timer_queue_destroy(struct rttimer_queue *rtq, int destroy) 1284 { 1285 1286 rt_timer_queue_remove_all(rtq, destroy); 1287 1288 LIST_REMOVE(rtq, rtq_link); 1289 1290 /* 1291 * Caller is responsible for freeing the rttimer_queue structure. 1292 */ 1293 } 1294 1295 unsigned long 1296 rt_timer_count(struct rttimer_queue *rtq) 1297 { 1298 return rtq->rtq_count; 1299 } 1300 1301 void 1302 rt_timer_remove_all(struct rtentry *rt, int destroy) 1303 { 1304 struct rttimer *r; 1305 1306 while ((r = LIST_FIRST(&rt->rt_timer)) != NULL) { 1307 LIST_REMOVE(r, rtt_link); 1308 TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); 1309 if (destroy) 1310 RTTIMER_CALLOUT(r); 1311 if (r->rtt_queue->rtq_count > 0) 1312 r->rtt_queue->rtq_count--; 1313 else 1314 printf("rt_timer_remove_all: rtq_count reached 0\n"); 1315 /* we are already at splsoftnet */ 1316 pool_put(&rttimer_pool, r); 1317 } 1318 } 1319 1320 int 1321 rt_timer_add(struct rtentry *rt, 1322 void (*func)(struct rtentry *, struct rttimer *), 1323 struct rttimer_queue *queue) 1324 { 1325 struct rttimer *r; 1326 int s; 1327 1328 /* 1329 * If there's already a timer with this action, destroy it before 1330 * we add a new one. 1331 */ 1332 LIST_FOREACH(r, &rt->rt_timer, rtt_link) { 1333 if (r->rtt_func == func) 1334 break; 1335 } 1336 if (r != NULL) { 1337 LIST_REMOVE(r, rtt_link); 1338 TAILQ_REMOVE(&r->rtt_queue->rtq_head, r, rtt_next); 1339 if (r->rtt_queue->rtq_count > 0) 1340 r->rtt_queue->rtq_count--; 1341 else 1342 printf("rt_timer_add: rtq_count reached 0\n"); 1343 } else { 1344 s = splsoftnet(); 1345 r = pool_get(&rttimer_pool, PR_NOWAIT); 1346 splx(s); 1347 if (r == NULL) 1348 return ENOBUFS; 1349 } 1350 1351 memset(r, 0, sizeof(*r)); 1352 1353 r->rtt_rt = rt; 1354 r->rtt_time = time_uptime; 1355 r->rtt_func = func; 1356 r->rtt_queue = queue; 1357 LIST_INSERT_HEAD(&rt->rt_timer, r, rtt_link); 1358 TAILQ_INSERT_TAIL(&queue->rtq_head, r, rtt_next); 1359 r->rtt_queue->rtq_count++; 1360 1361 return 0; 1362 } 1363 1364 /* ARGSUSED */ 1365 void 1366 rt_timer_timer(void *arg) 1367 { 1368 struct rttimer_queue *rtq; 1369 struct rttimer *r; 1370 int s; 1371 1372 s = splsoftnet(); 1373 LIST_FOREACH(rtq, &rttimer_queue_head, rtq_link) { 1374 while ((r = TAILQ_FIRST(&rtq->rtq_head)) != NULL && 1375 (r->rtt_time + rtq->rtq_timeout) < time_uptime) { 1376 LIST_REMOVE(r, rtt_link); 1377 TAILQ_REMOVE(&rtq->rtq_head, r, rtt_next); 1378 RTTIMER_CALLOUT(r); 1379 pool_put(&rttimer_pool, r); 1380 if (rtq->rtq_count > 0) 1381 rtq->rtq_count--; 1382 else 1383 printf("rt_timer_timer: rtq_count reached 0\n"); 1384 } 1385 } 1386 splx(s); 1387 1388 callout_reset(&rt_timer_ch, hz, rt_timer_timer, NULL); 1389 } 1390 1391 static struct rtentry * 1392 _rtcache_init(struct route *ro, int flag) 1393 { 1394 rtcache_invariants(ro); 1395 KASSERT(ro->_ro_rt == NULL); 1396 1397 if (rtcache_getdst(ro) == NULL) 1398 return NULL; 1399 ro->ro_invalid = false; 1400 if ((ro->_ro_rt = rtalloc1(rtcache_getdst(ro), flag)) != NULL) 1401 rtcache(ro); 1402 1403 rtcache_invariants(ro); 1404 return ro->_ro_rt; 1405 } 1406 1407 struct rtentry * 1408 rtcache_init(struct route *ro) 1409 { 1410 return _rtcache_init(ro, 1); 1411 } 1412 1413 struct rtentry * 1414 rtcache_init_noclone(struct route *ro) 1415 { 1416 return _rtcache_init(ro, 0); 1417 } 1418 1419 struct rtentry * 1420 rtcache_update(struct route *ro, int clone) 1421 { 1422 rtcache_clear(ro); 1423 return _rtcache_init(ro, clone); 1424 } 1425 1426 void 1427 rtcache_copy(struct route *new_ro, const struct route *old_ro) 1428 { 1429 struct rtentry *rt; 1430 1431 KASSERT(new_ro != old_ro); 1432 rtcache_invariants(new_ro); 1433 rtcache_invariants(old_ro); 1434 1435 if ((rt = rtcache_validate(old_ro)) != NULL) 1436 rt->rt_refcnt++; 1437 1438 if (rtcache_getdst(old_ro) == NULL || 1439 rtcache_setdst(new_ro, rtcache_getdst(old_ro)) != 0) 1440 return; 1441 1442 new_ro->ro_invalid = false; 1443 if ((new_ro->_ro_rt = rt) != NULL) 1444 rtcache(new_ro); 1445 rtcache_invariants(new_ro); 1446 } 1447 1448 static struct dom_rtlist invalid_routes = LIST_HEAD_INITIALIZER(dom_rtlist); 1449 1450 static void 1451 rtcache_invalidate(struct dom_rtlist *rtlist) 1452 { 1453 struct route *ro; 1454 1455 while ((ro = LIST_FIRST(rtlist)) != NULL) { 1456 rtcache_invariants(ro); 1457 KASSERT(ro->_ro_rt != NULL); 1458 ro->ro_invalid = true; 1459 LIST_REMOVE(ro, ro_rtcache_next); 1460 LIST_INSERT_HEAD(&invalid_routes, ro, ro_rtcache_next); 1461 rtcache_invariants(ro); 1462 } 1463 } 1464 1465 static void 1466 rtcache_clear(struct route *ro) 1467 { 1468 rtcache_invariants(ro); 1469 if (ro->_ro_rt == NULL) 1470 return; 1471 1472 LIST_REMOVE(ro, ro_rtcache_next); 1473 1474 rtfree(ro->_ro_rt); 1475 ro->_ro_rt = NULL; 1476 ro->ro_invalid = false; 1477 rtcache_invariants(ro); 1478 } 1479 1480 struct rtentry * 1481 rtcache_lookup2(struct route *ro, const struct sockaddr *dst, int clone, 1482 int *hitp) 1483 { 1484 const struct sockaddr *odst; 1485 struct rtentry *rt = NULL; 1486 1487 odst = rtcache_getdst(ro); 1488 if (odst == NULL) 1489 goto miss; 1490 1491 if (sockaddr_cmp(odst, dst) != 0) { 1492 rtcache_free(ro); 1493 goto miss; 1494 } 1495 1496 rt = rtcache_validate(ro); 1497 if (rt == NULL) { 1498 rtcache_clear(ro); 1499 goto miss; 1500 } 1501 1502 *hitp = 1; 1503 rtcache_invariants(ro); 1504 1505 return rt; 1506 miss: 1507 *hitp = 0; 1508 if (rtcache_setdst(ro, dst) == 0) 1509 rt = _rtcache_init(ro, clone); 1510 1511 rtcache_invariants(ro); 1512 1513 return rt; 1514 } 1515 1516 void 1517 rtcache_free(struct route *ro) 1518 { 1519 rtcache_clear(ro); 1520 if (ro->ro_sa != NULL) { 1521 sockaddr_free(ro->ro_sa); 1522 ro->ro_sa = NULL; 1523 } 1524 rtcache_invariants(ro); 1525 } 1526 1527 int 1528 rtcache_setdst(struct route *ro, const struct sockaddr *sa) 1529 { 1530 KASSERT(sa != NULL); 1531 1532 rtcache_invariants(ro); 1533 if (ro->ro_sa != NULL) { 1534 if (ro->ro_sa->sa_family == sa->sa_family) { 1535 rtcache_clear(ro); 1536 sockaddr_copy(ro->ro_sa, ro->ro_sa->sa_len, sa); 1537 rtcache_invariants(ro); 1538 return 0; 1539 } 1540 /* free ro_sa, wrong family */ 1541 rtcache_free(ro); 1542 } 1543 1544 KASSERT(ro->_ro_rt == NULL); 1545 1546 if ((ro->ro_sa = sockaddr_dup(sa, M_ZERO | M_NOWAIT)) == NULL) { 1547 rtcache_invariants(ro); 1548 return ENOMEM; 1549 } 1550 rtcache_invariants(ro); 1551 return 0; 1552 } 1553 1554 const struct sockaddr * 1555 rt_settag(struct rtentry *rt, const struct sockaddr *tag) 1556 { 1557 if (rt->rt_tag != tag) { 1558 if (rt->rt_tag != NULL) 1559 sockaddr_free(rt->rt_tag); 1560 rt->rt_tag = sockaddr_dup(tag, M_ZERO | M_NOWAIT); 1561 } 1562 return rt->rt_tag; 1563 } 1564 1565 struct sockaddr * 1566 rt_gettag(struct rtentry *rt) 1567 { 1568 return rt->rt_tag; 1569 } 1570
Indexes created Wed Sep 24 05:09:52 GMT 2025