1 /* 2 * Linux INET6 implementation 3 * FIB front-end. 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 */ 13 14 /* Changes: 15 * 16 * YOSHIFUJI Hideaki @USAGI 17 * reworked default router selection. 18 * - respect outgoing interface 19 * - select from (probably) reachable routers (i.e. 20 * routers in REACHABLE, STALE, DELAY or PROBE states). 21 * - always select the same router if it is (probably) 22 * reachable. otherwise, round-robin the list. 23 * Ville Nuorvala 24 * Fixed routing subtrees. 25 */ 26 27 #define pr_fmt(fmt) "IPv6: " fmt 28 29 #include <linux/capability.h> 30 #include <linux/errno.h> 31 #include <linux/export.h> 32 #include <linux/types.h> 33 #include <linux/times.h> 34 #include <linux/socket.h> 35 #include <linux/sockios.h> 36 #include <linux/net.h> 37 #include <linux/route.h> 38 #include <linux/netdevice.h> 39 #include <linux/in6.h> 40 #include <linux/mroute6.h> 41 #include <linux/init.h> 42 #include <linux/if_arp.h> 43 #include <linux/proc_fs.h> 44 #include <linux/seq_file.h> 45 #include <linux/nsproxy.h> 46 #include <linux/slab.h> 47 #include <net/net_namespace.h> 48 #include <net/snmp.h> 49 #include <net/ipv6.h> 50 #include <net/ip6_fib.h> 51 #include <net/ip6_route.h> 52 #include <net/ndisc.h> 53 #include <net/addrconf.h> 54 #include <net/tcp.h> 55 #include <linux/rtnetlink.h> 56 #include <net/dst.h> 57 #include <net/xfrm.h> 58 #include <net/netevent.h> 59 #include <net/netlink.h> 60 #include <net/nexthop.h> 61 62 #include <asm/uaccess.h> 63 64 #ifdef CONFIG_SYSCTL 65 #include <linux/sysctl.h> 66 #endif 67 68 enum rt6_nud_state { 69 RT6_NUD_FAIL_HARD = -3, 70 RT6_NUD_FAIL_PROBE = -2, 71 RT6_NUD_FAIL_DO_RR = -1, 72 RT6_NUD_SUCCEED = 1 73 }; 74 75 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 76 const struct in6_addr *dest); 77 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); 78 static unsigned int ip6_default_advmss(const struct dst_entry *dst); 79 static unsigned int ip6_mtu(const struct dst_entry *dst); 80 static struct dst_entry *ip6_negative_advice(struct dst_entry *); 81 static void ip6_dst_destroy(struct dst_entry *); 82 static void ip6_dst_ifdown(struct dst_entry *, 83 struct net_device *dev, int how); 84 static int ip6_dst_gc(struct dst_ops *ops); 85 86 static int ip6_pkt_discard(struct sk_buff *skb); 87 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb); 88 static int ip6_pkt_prohibit(struct sk_buff *skb); 89 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb); 90 static void ip6_link_failure(struct sk_buff *skb); 91 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, 92 struct sk_buff *skb, u32 mtu); 93 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, 94 struct sk_buff *skb); 95 static int rt6_score_route(struct rt6_info *rt, int oif, int strict); 96 97 #ifdef CONFIG_IPV6_ROUTE_INFO 98 static struct rt6_info *rt6_add_route_info(struct net *net, 99 const struct in6_addr *prefix, int prefixlen, 100 const struct in6_addr *gwaddr, int ifindex, 101 unsigned int pref); 102 static struct rt6_info *rt6_get_route_info(struct net *net, 103 const struct in6_addr *prefix, int prefixlen, 104 const struct in6_addr *gwaddr, int ifindex); 105 #endif 106 107 static void rt6_bind_peer(struct rt6_info *rt, int create) 108 { 109 struct inet_peer_base *base; 110 struct inet_peer *peer; 111 112 base = inetpeer_base_ptr(rt->_rt6i_peer); 113 if (!base) 114 return; 115 116 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); 117 if (peer) { 118 if (!rt6_set_peer(rt, peer)) 119 inet_putpeer(peer); 120 } 121 } 122 123 static struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create) 124 { 125 if (rt6_has_peer(rt)) 126 return rt6_peer_ptr(rt); 127 128 rt6_bind_peer(rt, create); 129 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL); 130 } 131 132 static struct inet_peer *rt6_get_peer_create(struct rt6_info *rt) 133 { 134 return __rt6_get_peer(rt, 1); 135 } 136 137 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) 138 { 139 struct rt6_info *rt = (struct rt6_info *) dst; 140 struct inet_peer *peer; 141 u32 *p = NULL; 142 143 if (!(rt->dst.flags & DST_HOST)) 144 return NULL; 145 146 peer = rt6_get_peer_create(rt); 147 if (peer) { 148 u32 *old_p = __DST_METRICS_PTR(old); 149 unsigned long prev, new; 150 151 p = peer->metrics; 152 if (inet_metrics_new(peer) || 153 (old & DST_METRICS_FORCE_OVERWRITE)) 154 memcpy(p, old_p, sizeof(u32) * RTAX_MAX); 155 156 new = (unsigned long) p; 157 prev = cmpxchg(&dst->_metrics, old, new); 158 159 if (prev != old) { 160 p = __DST_METRICS_PTR(prev); 161 if (prev & DST_METRICS_READ_ONLY) 162 p = NULL; 163 } 164 } 165 return p; 166 } 167 168 static inline const void *choose_neigh_daddr(struct rt6_info *rt, 169 struct sk_buff *skb, 170 const void *daddr) 171 { 172 struct in6_addr *p = &rt->rt6i_gateway; 173 174 if (!ipv6_addr_any(p)) 175 return (const void *) p; 176 else if (skb) 177 return &ipv6_hdr(skb)->daddr; 178 return daddr; 179 } 180 181 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, 182 struct sk_buff *skb, 183 const void *daddr) 184 { 185 struct rt6_info *rt = (struct rt6_info *) dst; 186 struct neighbour *n; 187 188 daddr = choose_neigh_daddr(rt, skb, daddr); 189 n = __ipv6_neigh_lookup(dst->dev, daddr); 190 if (n) 191 return n; 192 return neigh_create(&nd_tbl, daddr, dst->dev); 193 } 194 195 static struct dst_ops ip6_dst_ops_template = { 196 .family = AF_INET6, 197 .protocol = cpu_to_be16(ETH_P_IPV6), 198 .gc = ip6_dst_gc, 199 .gc_thresh = 1024, 200 .check = ip6_dst_check, 201 .default_advmss = ip6_default_advmss, 202 .mtu = ip6_mtu, 203 .cow_metrics = ipv6_cow_metrics, 204 .destroy = ip6_dst_destroy, 205 .ifdown = ip6_dst_ifdown, 206 .negative_advice = ip6_negative_advice, 207 .link_failure = ip6_link_failure, 208 .update_pmtu = ip6_rt_update_pmtu, 209 .redirect = rt6_do_redirect, 210 .local_out = __ip6_local_out, 211 .neigh_lookup = ip6_neigh_lookup, 212 }; 213 214 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) 215 { 216 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); 217 218 return mtu ? : dst->dev->mtu; 219 } 220 221 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, 222 struct sk_buff *skb, u32 mtu) 223 { 224 } 225 226 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, 227 struct sk_buff *skb) 228 { 229 } 230 231 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, 232 unsigned long old) 233 { 234 return NULL; 235 } 236 237 static struct dst_ops ip6_dst_blackhole_ops = { 238 .family = AF_INET6, 239 .protocol = cpu_to_be16(ETH_P_IPV6), 240 .destroy = ip6_dst_destroy, 241 .check = ip6_dst_check, 242 .mtu = ip6_blackhole_mtu, 243 .default_advmss = ip6_default_advmss, 244 .update_pmtu = ip6_rt_blackhole_update_pmtu, 245 .redirect = ip6_rt_blackhole_redirect, 246 .cow_metrics = ip6_rt_blackhole_cow_metrics, 247 .neigh_lookup = ip6_neigh_lookup, 248 }; 249 250 static const u32 ip6_template_metrics[RTAX_MAX] = { 251 [RTAX_HOPLIMIT - 1] = 0, 252 }; 253 254 static const struct rt6_info ip6_null_entry_template = { 255 .dst = { 256 .__refcnt = ATOMIC_INIT(1), 257 .__use = 1, 258 .obsolete = DST_OBSOLETE_FORCE_CHK, 259 .error = -ENETUNREACH, 260 .input = ip6_pkt_discard, 261 .output = ip6_pkt_discard_out, 262 }, 263 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 264 .rt6i_protocol = RTPROT_KERNEL, 265 .rt6i_metric = ~(u32) 0, 266 .rt6i_ref = ATOMIC_INIT(1), 267 }; 268 269 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 270 271 static const struct rt6_info ip6_prohibit_entry_template = { 272 .dst = { 273 .__refcnt = ATOMIC_INIT(1), 274 .__use = 1, 275 .obsolete = DST_OBSOLETE_FORCE_CHK, 276 .error = -EACCES, 277 .input = ip6_pkt_prohibit, 278 .output = ip6_pkt_prohibit_out, 279 }, 280 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 281 .rt6i_protocol = RTPROT_KERNEL, 282 .rt6i_metric = ~(u32) 0, 283 .rt6i_ref = ATOMIC_INIT(1), 284 }; 285 286 static const struct rt6_info ip6_blk_hole_entry_template = { 287 .dst = { 288 .__refcnt = ATOMIC_INIT(1), 289 .__use = 1, 290 .obsolete = DST_OBSOLETE_FORCE_CHK, 291 .error = -EINVAL, 292 .input = dst_discard, 293 .output = dst_discard_sk, 294 }, 295 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 296 .rt6i_protocol = RTPROT_KERNEL, 297 .rt6i_metric = ~(u32) 0, 298 .rt6i_ref = ATOMIC_INIT(1), 299 }; 300 301 #endif 302 303 /* allocate dst with ip6_dst_ops */ 304 static inline struct rt6_info *ip6_dst_alloc(struct net *net, 305 struct net_device *dev, 306 int flags, 307 struct fib6_table *table) 308 { 309 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, 310 0, DST_OBSOLETE_FORCE_CHK, flags); 311 312 if (rt) { 313 struct dst_entry *dst = &rt->dst; 314 315 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); 316 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); 317 rt->rt6i_genid = rt_genid_ipv6(net); 318 INIT_LIST_HEAD(&rt->rt6i_siblings); 319 } 320 return rt; 321 } 322 323 static void ip6_dst_destroy(struct dst_entry *dst) 324 { 325 struct rt6_info *rt = (struct rt6_info *)dst; 326 struct inet6_dev *idev = rt->rt6i_idev; 327 struct dst_entry *from = dst->from; 328 329 if (!(rt->dst.flags & DST_HOST)) 330 dst_destroy_metrics_generic(dst); 331 332 if (idev) { 333 rt->rt6i_idev = NULL; 334 in6_dev_put(idev); 335 } 336 337 dst->from = NULL; 338 dst_release(from); 339 340 if (rt6_has_peer(rt)) { 341 struct inet_peer *peer = rt6_peer_ptr(rt); 342 inet_putpeer(peer); 343 } 344 } 345 346 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, 347 int how) 348 { 349 struct rt6_info *rt = (struct rt6_info *)dst; 350 struct inet6_dev *idev = rt->rt6i_idev; 351 struct net_device *loopback_dev = 352 dev_net(dev)->loopback_dev; 353 354 if (dev != loopback_dev) { 355 if (idev && idev->dev == dev) { 356 struct inet6_dev *loopback_idev = 357 in6_dev_get(loopback_dev); 358 if (loopback_idev) { 359 rt->rt6i_idev = loopback_idev; 360 in6_dev_put(idev); 361 } 362 } 363 } 364 } 365 366 static bool rt6_check_expired(const struct rt6_info *rt) 367 { 368 if (rt->rt6i_flags & RTF_EXPIRES) { 369 if (time_after(jiffies, rt->dst.expires)) 370 return true; 371 } else if (rt->dst.from) { 372 return rt6_check_expired((struct rt6_info *) rt->dst.from); 373 } 374 return false; 375 } 376 377 /* Multipath route selection: 378 * Hash based function using packet header and flowlabel. 379 * Adapted from fib_info_hashfn() 380 */ 381 static int rt6_info_hash_nhsfn(unsigned int candidate_count, 382 const struct flowi6 *fl6) 383 { 384 unsigned int val = fl6->flowi6_proto; 385 386 val ^= ipv6_addr_hash(&fl6->daddr); 387 val ^= ipv6_addr_hash(&fl6->saddr); 388 389 /* Work only if this not encapsulated */ 390 switch (fl6->flowi6_proto) { 391 case IPPROTO_UDP: 392 case IPPROTO_TCP: 393 case IPPROTO_SCTP: 394 val ^= (__force u16)fl6->fl6_sport; 395 val ^= (__force u16)fl6->fl6_dport; 396 break; 397 398 case IPPROTO_ICMPV6: 399 val ^= (__force u16)fl6->fl6_icmp_type; 400 val ^= (__force u16)fl6->fl6_icmp_code; 401 break; 402 } 403 /* RFC6438 recommands to use flowlabel */ 404 val ^= (__force u32)fl6->flowlabel; 405 406 /* Perhaps, we need to tune, this function? */ 407 val = val ^ (val >> 7) ^ (val >> 12); 408 return val % candidate_count; 409 } 410 411 static struct rt6_info *rt6_multipath_select(struct rt6_info *match, 412 struct flowi6 *fl6, int oif, 413 int strict) 414 { 415 struct rt6_info *sibling, *next_sibling; 416 int route_choosen; 417 418 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); 419 /* Don't change the route, if route_choosen == 0 420 * (siblings does not include ourself) 421 */ 422 if (route_choosen) 423 list_for_each_entry_safe(sibling, next_sibling, 424 &match->rt6i_siblings, rt6i_siblings) { 425 route_choosen--; 426 if (route_choosen == 0) { 427 if (rt6_score_route(sibling, oif, strict) < 0) 428 break; 429 match = sibling; 430 break; 431 } 432 } 433 return match; 434 } 435 436 /* 437 * Route lookup. Any table->tb6_lock is implied. 438 */ 439 440 static inline struct rt6_info *rt6_device_match(struct net *net, 441 struct rt6_info *rt, 442 const struct in6_addr *saddr, 443 int oif, 444 int flags) 445 { 446 struct rt6_info *local = NULL; 447 struct rt6_info *sprt; 448 449 if (!oif && ipv6_addr_any(saddr)) 450 goto out; 451 452 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { 453 struct net_device *dev = sprt->dst.dev; 454 455 if (oif) { 456 if (dev->ifindex == oif) 457 return sprt; 458 if (dev->flags & IFF_LOOPBACK) { 459 if (!sprt->rt6i_idev || 460 sprt->rt6i_idev->dev->ifindex != oif) { 461 if (flags & RT6_LOOKUP_F_IFACE && oif) 462 continue; 463 if (local && (!oif || 464 local->rt6i_idev->dev->ifindex == oif)) 465 continue; 466 } 467 local = sprt; 468 } 469 } else { 470 if (ipv6_chk_addr(net, saddr, dev, 471 flags & RT6_LOOKUP_F_IFACE)) 472 return sprt; 473 } 474 } 475 476 if (oif) { 477 if (local) 478 return local; 479 480 if (flags & RT6_LOOKUP_F_IFACE) 481 return net->ipv6.ip6_null_entry; 482 } 483 out: 484 return rt; 485 } 486 487 #ifdef CONFIG_IPV6_ROUTER_PREF 488 struct __rt6_probe_work { 489 struct work_struct work; 490 struct in6_addr target; 491 struct net_device *dev; 492 }; 493 494 static void rt6_probe_deferred(struct work_struct *w) 495 { 496 struct in6_addr mcaddr; 497 struct __rt6_probe_work *work = 498 container_of(w, struct __rt6_probe_work, work); 499 500 addrconf_addr_solict_mult(&work->target, &mcaddr); 501 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); 502 dev_put(work->dev); 503 kfree(w); 504 } 505 506 static void rt6_probe(struct rt6_info *rt) 507 { 508 struct neighbour *neigh; 509 /* 510 * Okay, this does not seem to be appropriate 511 * for now, however, we need to check if it 512 * is really so; aka Router Reachability Probing. 513 * 514 * Router Reachability Probe MUST be rate-limited 515 * to no more than one per minute. 516 */ 517 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) 518 return; 519 rcu_read_lock_bh(); 520 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 521 if (neigh) { 522 write_lock(&neigh->lock); 523 if (neigh->nud_state & NUD_VALID) 524 goto out; 525 } 526 527 if (!neigh || 528 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { 529 struct __rt6_probe_work *work; 530 531 work = kmalloc(sizeof(*work), GFP_ATOMIC); 532 533 if (neigh && work) 534 __neigh_set_probe_once(neigh); 535 536 if (neigh) 537 write_unlock(&neigh->lock); 538 539 if (work) { 540 INIT_WORK(&work->work, rt6_probe_deferred); 541 work->target = rt->rt6i_gateway; 542 dev_hold(rt->dst.dev); 543 work->dev = rt->dst.dev; 544 schedule_work(&work->work); 545 } 546 } else { 547 out: 548 write_unlock(&neigh->lock); 549 } 550 rcu_read_unlock_bh(); 551 } 552 #else 553 static inline void rt6_probe(struct rt6_info *rt) 554 { 555 } 556 #endif 557 558 /* 559 * Default Router Selection (RFC 2461 6.3.6) 560 */ 561 static inline int rt6_check_dev(struct rt6_info *rt, int oif) 562 { 563 struct net_device *dev = rt->dst.dev; 564 if (!oif || dev->ifindex == oif) 565 return 2; 566 if ((dev->flags & IFF_LOOPBACK) && 567 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) 568 return 1; 569 return 0; 570 } 571 572 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) 573 { 574 struct neighbour *neigh; 575 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; 576 577 if (rt->rt6i_flags & RTF_NONEXTHOP || 578 !(rt->rt6i_flags & RTF_GATEWAY)) 579 return RT6_NUD_SUCCEED; 580 581 rcu_read_lock_bh(); 582 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 583 if (neigh) { 584 read_lock(&neigh->lock); 585 if (neigh->nud_state & NUD_VALID) 586 ret = RT6_NUD_SUCCEED; 587 #ifdef CONFIG_IPV6_ROUTER_PREF 588 else if (!(neigh->nud_state & NUD_FAILED)) 589 ret = RT6_NUD_SUCCEED; 590 else 591 ret = RT6_NUD_FAIL_PROBE; 592 #endif 593 read_unlock(&neigh->lock); 594 } else { 595 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? 596 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; 597 } 598 rcu_read_unlock_bh(); 599 600 return ret; 601 } 602 603 static int rt6_score_route(struct rt6_info *rt, int oif, 604 int strict) 605 { 606 int m; 607 608 m = rt6_check_dev(rt, oif); 609 if (!m && (strict & RT6_LOOKUP_F_IFACE)) 610 return RT6_NUD_FAIL_HARD; 611 #ifdef CONFIG_IPV6_ROUTER_PREF 612 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; 613 #endif 614 if (strict & RT6_LOOKUP_F_REACHABLE) { 615 int n = rt6_check_neigh(rt); 616 if (n < 0) 617 return n; 618 } 619 return m; 620 } 621 622 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, 623 int *mpri, struct rt6_info *match, 624 bool *do_rr) 625 { 626 int m; 627 bool match_do_rr = false; 628 629 if (rt6_check_expired(rt)) 630 goto out; 631 632 m = rt6_score_route(rt, oif, strict); 633 if (m == RT6_NUD_FAIL_DO_RR) { 634 match_do_rr = true; 635 m = 0; /* lowest valid score */ 636 } else if (m == RT6_NUD_FAIL_HARD) { 637 goto out; 638 } 639 640 if (strict & RT6_LOOKUP_F_REACHABLE) 641 rt6_probe(rt); 642 643 /* note that m can be RT6_NUD_FAIL_PROBE at this point */ 644 if (m > *mpri) { 645 *do_rr = match_do_rr; 646 *mpri = m; 647 match = rt; 648 } 649 out: 650 return match; 651 } 652 653 static struct rt6_info *find_rr_leaf(struct fib6_node *fn, 654 struct rt6_info *rr_head, 655 u32 metric, int oif, int strict, 656 bool *do_rr) 657 { 658 struct rt6_info *rt, *match; 659 int mpri = -1; 660 661 match = NULL; 662 for (rt = rr_head; rt && rt->rt6i_metric == metric; 663 rt = rt->dst.rt6_next) 664 match = find_match(rt, oif, strict, &mpri, match, do_rr); 665 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; 666 rt = rt->dst.rt6_next) 667 match = find_match(rt, oif, strict, &mpri, match, do_rr); 668 669 return match; 670 } 671 672 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) 673 { 674 struct rt6_info *match, *rt0; 675 struct net *net; 676 bool do_rr = false; 677 678 rt0 = fn->rr_ptr; 679 if (!rt0) 680 fn->rr_ptr = rt0 = fn->leaf; 681 682 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, 683 &do_rr); 684 685 if (do_rr) { 686 struct rt6_info *next = rt0->dst.rt6_next; 687 688 /* no entries matched; do round-robin */ 689 if (!next || next->rt6i_metric != rt0->rt6i_metric) 690 next = fn->leaf; 691 692 if (next != rt0) 693 fn->rr_ptr = next; 694 } 695 696 net = dev_net(rt0->dst.dev); 697 return match ? match : net->ipv6.ip6_null_entry; 698 } 699 700 #ifdef CONFIG_IPV6_ROUTE_INFO 701 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 702 const struct in6_addr *gwaddr) 703 { 704 struct net *net = dev_net(dev); 705 struct route_info *rinfo = (struct route_info *) opt; 706 struct in6_addr prefix_buf, *prefix; 707 unsigned int pref; 708 unsigned long lifetime; 709 struct rt6_info *rt; 710 711 if (len < sizeof(struct route_info)) { 712 return -EINVAL; 713 } 714 715 /* Sanity check for prefix_len and length */ 716 if (rinfo->length > 3) { 717 return -EINVAL; 718 } else if (rinfo->prefix_len > 128) { 719 return -EINVAL; 720 } else if (rinfo->prefix_len > 64) { 721 if (rinfo->length < 2) { 722 return -EINVAL; 723 } 724 } else if (rinfo->prefix_len > 0) { 725 if (rinfo->length < 1) { 726 return -EINVAL; 727 } 728 } 729 730 pref = rinfo->route_pref; 731 if (pref == ICMPV6_ROUTER_PREF_INVALID) 732 return -EINVAL; 733 734 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); 735 736 if (rinfo->length == 3) 737 prefix = (struct in6_addr *)rinfo->prefix; 738 else { 739 /* this function is safe */ 740 ipv6_addr_prefix(&prefix_buf, 741 (struct in6_addr *)rinfo->prefix, 742 rinfo->prefix_len); 743 prefix = &prefix_buf; 744 } 745 746 if (rinfo->prefix_len == 0) 747 rt = rt6_get_dflt_router(gwaddr, dev); 748 else 749 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, 750 gwaddr, dev->ifindex); 751 752 if (rt && !lifetime) { 753 ip6_del_rt(rt); 754 rt = NULL; 755 } 756 757 if (!rt && lifetime) 758 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, 759 pref); 760 else if (rt) 761 rt->rt6i_flags = RTF_ROUTEINFO | 762 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); 763 764 if (rt) { 765 if (!addrconf_finite_timeout(lifetime)) 766 rt6_clean_expires(rt); 767 else 768 rt6_set_expires(rt, jiffies + HZ * lifetime); 769 770 ip6_rt_put(rt); 771 } 772 return 0; 773 } 774 #endif 775 776 #define BACKTRACK(__net, saddr) \ 777 do { \ 778 if (rt == __net->ipv6.ip6_null_entry) { \ 779 struct fib6_node *pn; \ 780 while (1) { \ 781 if (fn->fn_flags & RTN_TL_ROOT) \ 782 goto out; \ 783 pn = fn->parent; \ 784 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ 785 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ 786 else \ 787 fn = pn; \ 788 if (fn->fn_flags & RTN_RTINFO) \ 789 goto restart; \ 790 } \ 791 } \ 792 } while (0) 793 794 static struct rt6_info *ip6_pol_route_lookup(struct net *net, 795 struct fib6_table *table, 796 struct flowi6 *fl6, int flags) 797 { 798 struct fib6_node *fn; 799 struct rt6_info *rt; 800 801 read_lock_bh(&table->tb6_lock); 802 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 803 restart: 804 rt = fn->leaf; 805 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); 806 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) 807 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); 808 BACKTRACK(net, &fl6->saddr); 809 out: 810 dst_use(&rt->dst, jiffies); 811 read_unlock_bh(&table->tb6_lock); 812 return rt; 813 814 } 815 816 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, 817 int flags) 818 { 819 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); 820 } 821 EXPORT_SYMBOL_GPL(ip6_route_lookup); 822 823 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 824 const struct in6_addr *saddr, int oif, int strict) 825 { 826 struct flowi6 fl6 = { 827 .flowi6_oif = oif, 828 .daddr = *daddr, 829 }; 830 struct dst_entry *dst; 831 int flags = strict ? RT6_LOOKUP_F_IFACE : 0; 832 833 if (saddr) { 834 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 835 flags |= RT6_LOOKUP_F_HAS_SADDR; 836 } 837 838 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); 839 if (dst->error == 0) 840 return (struct rt6_info *) dst; 841 842 dst_release(dst); 843 844 return NULL; 845 } 846 847 EXPORT_SYMBOL(rt6_lookup); 848 849 /* ip6_ins_rt is called with FREE table->tb6_lock. 850 It takes new route entry, the addition fails by any reason the 851 route is freed. In any case, if caller does not hold it, it may 852 be destroyed. 853 */ 854 855 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info, 856 struct nlattr *mx, int mx_len) 857 { 858 int err; 859 struct fib6_table *table; 860 861 table = rt->rt6i_table; 862 write_lock_bh(&table->tb6_lock); 863 err = fib6_add(&table->tb6_root, rt, info, mx, mx_len); 864 write_unlock_bh(&table->tb6_lock); 865 866 return err; 867 } 868 869 int ip6_ins_rt(struct rt6_info *rt) 870 { 871 struct nl_info info = { 872 .nl_net = dev_net(rt->dst.dev), 873 }; 874 return __ip6_ins_rt(rt, &info, NULL, 0); 875 } 876 877 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, 878 const struct in6_addr *daddr, 879 const struct in6_addr *saddr) 880 { 881 struct rt6_info *rt; 882 883 /* 884 * Clone the route. 885 */ 886 887 rt = ip6_rt_copy(ort, daddr); 888 889 if (rt) { 890 if (ort->rt6i_dst.plen != 128 && 891 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) 892 rt->rt6i_flags |= RTF_ANYCAST; 893 894 rt->rt6i_flags |= RTF_CACHE; 895 896 #ifdef CONFIG_IPV6_SUBTREES 897 if (rt->rt6i_src.plen && saddr) { 898 rt->rt6i_src.addr = *saddr; 899 rt->rt6i_src.plen = 128; 900 } 901 #endif 902 } 903 904 return rt; 905 } 906 907 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, 908 const struct in6_addr *daddr) 909 { 910 struct rt6_info *rt = ip6_rt_copy(ort, daddr); 911 912 if (rt) 913 rt->rt6i_flags |= RTF_CACHE; 914 return rt; 915 } 916 917 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, 918 struct flowi6 *fl6, int flags) 919 { 920 struct fib6_node *fn; 921 struct rt6_info *rt, *nrt; 922 int strict = 0; 923 int attempts = 3; 924 int err; 925 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; 926 927 strict |= flags & RT6_LOOKUP_F_IFACE; 928 929 relookup: 930 read_lock_bh(&table->tb6_lock); 931 932 restart_2: 933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 934 935 restart: 936 rt = rt6_select(fn, oif, strict | reachable); 937 if (rt->rt6i_nsiblings) 938 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable); 939 BACKTRACK(net, &fl6->saddr); 940 if (rt == net->ipv6.ip6_null_entry || 941 rt->rt6i_flags & RTF_CACHE) 942 goto out; 943 944 dst_hold(&rt->dst); 945 read_unlock_bh(&table->tb6_lock); 946 947 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) 948 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); 949 else if (!(rt->dst.flags & DST_HOST)) 950 nrt = rt6_alloc_clone(rt, &fl6->daddr); 951 else 952 goto out2; 953 954 ip6_rt_put(rt); 955 rt = nrt ? : net->ipv6.ip6_null_entry; 956 957 dst_hold(&rt->dst); 958 if (nrt) { 959 err = ip6_ins_rt(nrt); 960 if (!err) 961 goto out2; 962 } 963 964 if (--attempts <= 0) 965 goto out2; 966 967 /* 968 * Race condition! In the gap, when table->tb6_lock was 969 * released someone could insert this route. Relookup. 970 */ 971 ip6_rt_put(rt); 972 goto relookup; 973 974 out: 975 if (reachable) { 976 reachable = 0; 977 goto restart_2; 978 } 979 dst_hold(&rt->dst); 980 read_unlock_bh(&table->tb6_lock); 981 out2: 982 rt->dst.lastuse = jiffies; 983 rt->dst.__use++; 984 985 return rt; 986 } 987 988 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, 989 struct flowi6 *fl6, int flags) 990 { 991 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); 992 } 993 994 static struct dst_entry *ip6_route_input_lookup(struct net *net, 995 struct net_device *dev, 996 struct flowi6 *fl6, int flags) 997 { 998 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) 999 flags |= RT6_LOOKUP_F_IFACE; 1000 1001 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); 1002 } 1003 1004 void ip6_route_input(struct sk_buff *skb) 1005 { 1006 const struct ipv6hdr *iph = ipv6_hdr(skb); 1007 struct net *net = dev_net(skb->dev); 1008 int flags = RT6_LOOKUP_F_HAS_SADDR; 1009 struct flowi6 fl6 = { 1010 .flowi6_iif = skb->dev->ifindex, 1011 .daddr = iph->daddr, 1012 .saddr = iph->saddr, 1013 .flowlabel = ip6_flowinfo(iph), 1014 .flowi6_mark = skb->mark, 1015 .flowi6_proto = iph->nexthdr, 1016 }; 1017 1018 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); 1019 } 1020 1021 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, 1022 struct flowi6 *fl6, int flags) 1023 { 1024 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); 1025 } 1026 1027 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, 1028 struct flowi6 *fl6) 1029 { 1030 int flags = 0; 1031 1032 fl6->flowi6_iif = LOOPBACK_IFINDEX; 1033 1034 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) 1035 flags |= RT6_LOOKUP_F_IFACE; 1036 1037 if (!ipv6_addr_any(&fl6->saddr)) 1038 flags |= RT6_LOOKUP_F_HAS_SADDR; 1039 else if (sk) 1040 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); 1041 1042 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); 1043 } 1044 1045 EXPORT_SYMBOL(ip6_route_output); 1046 1047 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) 1048 { 1049 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; 1050 struct dst_entry *new = NULL; 1051 1052 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); 1053 if (rt) { 1054 new = &rt->dst; 1055 1056 memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); 1057 rt6_init_peer(rt, net->ipv6.peers); 1058 1059 new->__use = 1; 1060 new->input = dst_discard; 1061 new->output = dst_discard_sk; 1062 1063 if (dst_metrics_read_only(&ort->dst)) 1064 new->_metrics = ort->dst._metrics; 1065 else 1066 dst_copy_metrics(new, &ort->dst); 1067 rt->rt6i_idev = ort->rt6i_idev; 1068 if (rt->rt6i_idev) 1069 in6_dev_hold(rt->rt6i_idev); 1070 1071 rt->rt6i_gateway = ort->rt6i_gateway; 1072 rt->rt6i_flags = ort->rt6i_flags; 1073 rt->rt6i_metric = 0; 1074 1075 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); 1076 #ifdef CONFIG_IPV6_SUBTREES 1077 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1078 #endif 1079 1080 dst_free(new); 1081 } 1082 1083 dst_release(dst_orig); 1084 return new ? new : ERR_PTR(-ENOMEM); 1085 } 1086 1087 /* 1088 * Destination cache support functions 1089 */ 1090 1091 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) 1092 { 1093 struct rt6_info *rt; 1094 1095 rt = (struct rt6_info *) dst; 1096 1097 /* All IPV6 dsts are created with ->obsolete set to the value 1098 * DST_OBSOLETE_FORCE_CHK which forces validation calls down 1099 * into this function always. 1100 */ 1101 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev))) 1102 return NULL; 1103 1104 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) 1105 return NULL; 1106 1107 if (rt6_check_expired(rt)) 1108 return NULL; 1109 1110 return dst; 1111 } 1112 1113 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) 1114 { 1115 struct rt6_info *rt = (struct rt6_info *) dst; 1116 1117 if (rt) { 1118 if (rt->rt6i_flags & RTF_CACHE) { 1119 if (rt6_check_expired(rt)) { 1120 ip6_del_rt(rt); 1121 dst = NULL; 1122 } 1123 } else { 1124 dst_release(dst); 1125 dst = NULL; 1126 } 1127 } 1128 return dst; 1129 } 1130 1131 static void ip6_link_failure(struct sk_buff *skb) 1132 { 1133 struct rt6_info *rt; 1134 1135 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); 1136 1137 rt = (struct rt6_info *) skb_dst(skb); 1138 if (rt) { 1139 if (rt->rt6i_flags & RTF_CACHE) { 1140 dst_hold(&rt->dst); 1141 if (ip6_del_rt(rt)) 1142 dst_free(&rt->dst); 1143 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { 1144 rt->rt6i_node->fn_sernum = -1; 1145 } 1146 } 1147 } 1148 1149 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, 1150 struct sk_buff *skb, u32 mtu) 1151 { 1152 struct rt6_info *rt6 = (struct rt6_info*)dst; 1153 1154 dst_confirm(dst); 1155 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { 1156 struct net *net = dev_net(dst->dev); 1157 1158 rt6->rt6i_flags |= RTF_MODIFIED; 1159 if (mtu < IPV6_MIN_MTU) { 1160 u32 features = dst_metric(dst, RTAX_FEATURES); 1161 mtu = IPV6_MIN_MTU; 1162 features |= RTAX_FEATURE_ALLFRAG; 1163 dst_metric_set(dst, RTAX_FEATURES, features); 1164 } 1165 dst_metric_set(dst, RTAX_MTU, mtu); 1166 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); 1167 } 1168 } 1169 1170 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, 1171 int oif, u32 mark) 1172 { 1173 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1174 struct dst_entry *dst; 1175 struct flowi6 fl6; 1176 1177 memset(&fl6, 0, sizeof(fl6)); 1178 fl6.flowi6_oif = oif; 1179 fl6.flowi6_mark = mark; 1180 fl6.daddr = iph->daddr; 1181 fl6.saddr = iph->saddr; 1182 fl6.flowlabel = ip6_flowinfo(iph); 1183 1184 dst = ip6_route_output(net, NULL, &fl6); 1185 if (!dst->error) 1186 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); 1187 dst_release(dst); 1188 } 1189 EXPORT_SYMBOL_GPL(ip6_update_pmtu); 1190 1191 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) 1192 { 1193 ip6_update_pmtu(skb, sock_net(sk), mtu, 1194 sk->sk_bound_dev_if, sk->sk_mark); 1195 } 1196 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); 1197 1198 /* Handle redirects */ 1199 struct ip6rd_flowi { 1200 struct flowi6 fl6; 1201 struct in6_addr gateway; 1202 }; 1203 1204 static struct rt6_info *__ip6_route_redirect(struct net *net, 1205 struct fib6_table *table, 1206 struct flowi6 *fl6, 1207 int flags) 1208 { 1209 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; 1210 struct rt6_info *rt; 1211 struct fib6_node *fn; 1212 1213 /* Get the "current" route for this destination and 1214 * check if the redirect has come from approriate router. 1215 * 1216 * RFC 4861 specifies that redirects should only be 1217 * accepted if they come from the nexthop to the target. 1218 * Due to the way the routes are chosen, this notion 1219 * is a bit fuzzy and one might need to check all possible 1220 * routes. 1221 */ 1222 1223 read_lock_bh(&table->tb6_lock); 1224 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 1225 restart: 1226 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1227 if (rt6_check_expired(rt)) 1228 continue; 1229 if (rt->dst.error) 1230 break; 1231 if (!(rt->rt6i_flags & RTF_GATEWAY)) 1232 continue; 1233 if (fl6->flowi6_oif != rt->dst.dev->ifindex) 1234 continue; 1235 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) 1236 continue; 1237 break; 1238 } 1239 1240 if (!rt) 1241 rt = net->ipv6.ip6_null_entry; 1242 else if (rt->dst.error) { 1243 rt = net->ipv6.ip6_null_entry; 1244 goto out; 1245 } 1246 BACKTRACK(net, &fl6->saddr); 1247 out: 1248 dst_hold(&rt->dst); 1249 1250 read_unlock_bh(&table->tb6_lock); 1251 1252 return rt; 1253 }; 1254 1255 static struct dst_entry *ip6_route_redirect(struct net *net, 1256 const struct flowi6 *fl6, 1257 const struct in6_addr *gateway) 1258 { 1259 int flags = RT6_LOOKUP_F_HAS_SADDR; 1260 struct ip6rd_flowi rdfl; 1261 1262 rdfl.fl6 = *fl6; 1263 rdfl.gateway = *gateway; 1264 1265 return fib6_rule_lookup(net, &rdfl.fl6, 1266 flags, __ip6_route_redirect); 1267 } 1268 1269 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) 1270 { 1271 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1272 struct dst_entry *dst; 1273 struct flowi6 fl6; 1274 1275 memset(&fl6, 0, sizeof(fl6)); 1276 fl6.flowi6_iif = LOOPBACK_IFINDEX; 1277 fl6.flowi6_oif = oif; 1278 fl6.flowi6_mark = mark; 1279 fl6.daddr = iph->daddr; 1280 fl6.saddr = iph->saddr; 1281 fl6.flowlabel = ip6_flowinfo(iph); 1282 1283 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); 1284 rt6_do_redirect(dst, NULL, skb); 1285 dst_release(dst); 1286 } 1287 EXPORT_SYMBOL_GPL(ip6_redirect); 1288 1289 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 1290 u32 mark) 1291 { 1292 const struct ipv6hdr *iph = ipv6_hdr(skb); 1293 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); 1294 struct dst_entry *dst; 1295 struct flowi6 fl6; 1296 1297 memset(&fl6, 0, sizeof(fl6)); 1298 fl6.flowi6_iif = LOOPBACK_IFINDEX; 1299 fl6.flowi6_oif = oif; 1300 fl6.flowi6_mark = mark; 1301 fl6.daddr = msg->dest; 1302 fl6.saddr = iph->daddr; 1303 1304 dst = ip6_route_redirect(net, &fl6, &iph->saddr); 1305 rt6_do_redirect(dst, NULL, skb); 1306 dst_release(dst); 1307 } 1308 1309 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) 1310 { 1311 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); 1312 } 1313 EXPORT_SYMBOL_GPL(ip6_sk_redirect); 1314 1315 static unsigned int ip6_default_advmss(const struct dst_entry *dst) 1316 { 1317 struct net_device *dev = dst->dev; 1318 unsigned int mtu = dst_mtu(dst); 1319 struct net *net = dev_net(dev); 1320 1321 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); 1322 1323 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) 1324 mtu = net->ipv6.sysctl.ip6_rt_min_advmss; 1325 1326 /* 1327 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and 1328 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. 1329 * IPV6_MAXPLEN is also valid and means: "any MSS, 1330 * rely only on pmtu discovery" 1331 */ 1332 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) 1333 mtu = IPV6_MAXPLEN; 1334 return mtu; 1335 } 1336 1337 static unsigned int ip6_mtu(const struct dst_entry *dst) 1338 { 1339 struct inet6_dev *idev; 1340 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); 1341 1342 if (mtu) 1343 goto out; 1344 1345 mtu = IPV6_MIN_MTU; 1346 1347 rcu_read_lock(); 1348 idev = __in6_dev_get(dst->dev); 1349 if (idev) 1350 mtu = idev->cnf.mtu6; 1351 rcu_read_unlock(); 1352 1353 out: 1354 return min_t(unsigned int, mtu, IP6_MAX_MTU); 1355 } 1356 1357 static struct dst_entry *icmp6_dst_gc_list; 1358 static DEFINE_SPINLOCK(icmp6_dst_lock); 1359 1360 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 1361 struct flowi6 *fl6) 1362 { 1363 struct dst_entry *dst; 1364 struct rt6_info *rt; 1365 struct inet6_dev *idev = in6_dev_get(dev); 1366 struct net *net = dev_net(dev); 1367 1368 if (unlikely(!idev)) 1369 return ERR_PTR(-ENODEV); 1370 1371 rt = ip6_dst_alloc(net, dev, 0, NULL); 1372 if (unlikely(!rt)) { 1373 in6_dev_put(idev); 1374 dst = ERR_PTR(-ENOMEM); 1375 goto out; 1376 } 1377 1378 rt->dst.flags |= DST_HOST; 1379 rt->dst.output = ip6_output; 1380 atomic_set(&rt->dst.__refcnt, 1); 1381 rt->rt6i_gateway = fl6->daddr; 1382 rt->rt6i_dst.addr = fl6->daddr; 1383 rt->rt6i_dst.plen = 128; 1384 rt->rt6i_idev = idev; 1385 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); 1386 1387 spin_lock_bh(&icmp6_dst_lock); 1388 rt->dst.next = icmp6_dst_gc_list; 1389 icmp6_dst_gc_list = &rt->dst; 1390 spin_unlock_bh(&icmp6_dst_lock); 1391 1392 fib6_force_start_gc(net); 1393 1394 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); 1395 1396 out: 1397 return dst; 1398 } 1399 1400 int icmp6_dst_gc(void) 1401 { 1402 struct dst_entry *dst, **pprev; 1403 int more = 0; 1404 1405 spin_lock_bh(&icmp6_dst_lock); 1406 pprev = &icmp6_dst_gc_list; 1407 1408 while ((dst = *pprev) != NULL) { 1409 if (!atomic_read(&dst->__refcnt)) { 1410 *pprev = dst->next; 1411 dst_free(dst); 1412 } else { 1413 pprev = &dst->next; 1414 ++more; 1415 } 1416 } 1417 1418 spin_unlock_bh(&icmp6_dst_lock); 1419 1420 return more; 1421 } 1422 1423 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), 1424 void *arg) 1425 { 1426 struct dst_entry *dst, **pprev; 1427 1428 spin_lock_bh(&icmp6_dst_lock); 1429 pprev = &icmp6_dst_gc_list; 1430 while ((dst = *pprev) != NULL) { 1431 struct rt6_info *rt = (struct rt6_info *) dst; 1432 if (func(rt, arg)) { 1433 *pprev = dst->next; 1434 dst_free(dst); 1435 } else { 1436 pprev = &dst->next; 1437 } 1438 } 1439 spin_unlock_bh(&icmp6_dst_lock); 1440 } 1441 1442 static int ip6_dst_gc(struct dst_ops *ops) 1443 { 1444 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); 1445 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; 1446 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; 1447 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; 1448 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; 1449 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; 1450 int entries; 1451 1452 entries = dst_entries_get_fast(ops); 1453 if (time_after(rt_last_gc + rt_min_interval, jiffies) && 1454 entries <= rt_max_size) 1455 goto out; 1456 1457 net->ipv6.ip6_rt_gc_expire++; 1458 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size); 1459 entries = dst_entries_get_slow(ops); 1460 if (entries < ops->gc_thresh) 1461 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; 1462 out: 1463 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; 1464 return entries > rt_max_size; 1465 } 1466 1467 /* 1468 * 1469 */ 1470 1471 int ip6_route_add(struct fib6_config *cfg) 1472 { 1473 int err; 1474 struct net *net = cfg->fc_nlinfo.nl_net; 1475 struct rt6_info *rt = NULL; 1476 struct net_device *dev = NULL; 1477 struct inet6_dev *idev = NULL; 1478 struct fib6_table *table; 1479 int addr_type; 1480 1481 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) 1482 return -EINVAL; 1483 #ifndef CONFIG_IPV6_SUBTREES 1484 if (cfg->fc_src_len) 1485 return -EINVAL; 1486 #endif 1487 if (cfg->fc_ifindex) { 1488 err = -ENODEV; 1489 dev = dev_get_by_index(net, cfg->fc_ifindex); 1490 if (!dev) 1491 goto out; 1492 idev = in6_dev_get(dev); 1493 if (!idev) 1494 goto out; 1495 } 1496 1497 if (cfg->fc_metric == 0) 1498 cfg->fc_metric = IP6_RT_PRIO_USER; 1499 1500 err = -ENOBUFS; 1501 if (cfg->fc_nlinfo.nlh && 1502 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { 1503 table = fib6_get_table(net, cfg->fc_table); 1504 if (!table) { 1505 pr_warn("NLM_F_CREATE should be specified when creating new route\n"); 1506 table = fib6_new_table(net, cfg->fc_table); 1507 } 1508 } else { 1509 table = fib6_new_table(net, cfg->fc_table); 1510 } 1511 1512 if (!table) 1513 goto out; 1514 1515 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); 1516 1517 if (!rt) { 1518 err = -ENOMEM; 1519 goto out; 1520 } 1521 1522 if (cfg->fc_flags & RTF_EXPIRES) 1523 rt6_set_expires(rt, jiffies + 1524 clock_t_to_jiffies(cfg->fc_expires)); 1525 else 1526 rt6_clean_expires(rt); 1527 1528 if (cfg->fc_protocol == RTPROT_UNSPEC) 1529 cfg->fc_protocol = RTPROT_BOOT; 1530 rt->rt6i_protocol = cfg->fc_protocol; 1531 1532 addr_type = ipv6_addr_type(&cfg->fc_dst); 1533 1534 if (addr_type & IPV6_ADDR_MULTICAST) 1535 rt->dst.input = ip6_mc_input; 1536 else if (cfg->fc_flags & RTF_LOCAL) 1537 rt->dst.input = ip6_input; 1538 else 1539 rt->dst.input = ip6_forward; 1540 1541 rt->dst.output = ip6_output; 1542 1543 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); 1544 rt->rt6i_dst.plen = cfg->fc_dst_len; 1545 if (rt->rt6i_dst.plen == 128) { 1546 rt->dst.flags |= DST_HOST; 1547 dst_metrics_set_force_overwrite(&rt->dst); 1548 } 1549 1550 #ifdef CONFIG_IPV6_SUBTREES 1551 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); 1552 rt->rt6i_src.plen = cfg->fc_src_len; 1553 #endif 1554 1555 rt->rt6i_metric = cfg->fc_metric; 1556 1557 /* We cannot add true routes via loopback here, 1558 they would result in kernel looping; promote them to reject routes 1559 */ 1560 if ((cfg->fc_flags & RTF_REJECT) || 1561 (dev && (dev->flags & IFF_LOOPBACK) && 1562 !(addr_type & IPV6_ADDR_LOOPBACK) && 1563 !(cfg->fc_flags & RTF_LOCAL))) { 1564 /* hold loopback dev/idev if we haven't done so. */ 1565 if (dev != net->loopback_dev) { 1566 if (dev) { 1567 dev_put(dev); 1568 in6_dev_put(idev); 1569 } 1570 dev = net->loopback_dev; 1571 dev_hold(dev); 1572 idev = in6_dev_get(dev); 1573 if (!idev) { 1574 err = -ENODEV; 1575 goto out; 1576 } 1577 } 1578 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; 1579 switch (cfg->fc_type) { 1580 case RTN_BLACKHOLE: 1581 rt->dst.error = -EINVAL; 1582 rt->dst.output = dst_discard_sk; 1583 rt->dst.input = dst_discard; 1584 break; 1585 case RTN_PROHIBIT: 1586 rt->dst.error = -EACCES; 1587 rt->dst.output = ip6_pkt_prohibit_out; 1588 rt->dst.input = ip6_pkt_prohibit; 1589 break; 1590 case RTN_THROW: 1591 default: 1592 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN 1593 : -ENETUNREACH; 1594 rt->dst.output = ip6_pkt_discard_out; 1595 rt->dst.input = ip6_pkt_discard; 1596 break; 1597 } 1598 goto install_route; 1599 } 1600 1601 if (cfg->fc_flags & RTF_GATEWAY) { 1602 const struct in6_addr *gw_addr; 1603 int gwa_type; 1604 1605 gw_addr = &cfg->fc_gateway; 1606 rt->rt6i_gateway = *gw_addr; 1607 gwa_type = ipv6_addr_type(gw_addr); 1608 1609 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { 1610 struct rt6_info *grt; 1611 1612 /* IPv6 strictly inhibits using not link-local 1613 addresses as nexthop address. 1614 Otherwise, router will not able to send redirects. 1615 It is very good, but in some (rare!) circumstances 1616 (SIT, PtP, NBMA NOARP links) it is handy to allow 1617 some exceptions. --ANK 1618 */ 1619 err = -EINVAL; 1620 if (!(gwa_type & IPV6_ADDR_UNICAST)) 1621 goto out; 1622 1623 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); 1624 1625 err = -EHOSTUNREACH; 1626 if (!grt) 1627 goto out; 1628 if (dev) { 1629 if (dev != grt->dst.dev) { 1630 ip6_rt_put(grt); 1631 goto out; 1632 } 1633 } else { 1634 dev = grt->dst.dev; 1635 idev = grt->rt6i_idev; 1636 dev_hold(dev); 1637 in6_dev_hold(grt->rt6i_idev); 1638 } 1639 if (!(grt->rt6i_flags & RTF_GATEWAY)) 1640 err = 0; 1641 ip6_rt_put(grt); 1642 1643 if (err) 1644 goto out; 1645 } 1646 err = -EINVAL; 1647 if (!dev || (dev->flags & IFF_LOOPBACK)) 1648 goto out; 1649 } 1650 1651 err = -ENODEV; 1652 if (!dev) 1653 goto out; 1654 1655 if (!ipv6_addr_any(&cfg->fc_prefsrc)) { 1656 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { 1657 err = -EINVAL; 1658 goto out; 1659 } 1660 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; 1661 rt->rt6i_prefsrc.plen = 128; 1662 } else 1663 rt->rt6i_prefsrc.plen = 0; 1664 1665 rt->rt6i_flags = cfg->fc_flags; 1666 1667 install_route: 1668 rt->dst.dev = dev; 1669 rt->rt6i_idev = idev; 1670 rt->rt6i_table = table; 1671 1672 cfg->fc_nlinfo.nl_net = dev_net(dev); 1673 1674 return __ip6_ins_rt(rt, &cfg->fc_nlinfo, cfg->fc_mx, cfg->fc_mx_len); 1675 1676 out: 1677 if (dev) 1678 dev_put(dev); 1679 if (idev) 1680 in6_dev_put(idev); 1681 if (rt) 1682 dst_free(&rt->dst); 1683 return err; 1684 } 1685 1686 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) 1687 { 1688 int err; 1689 struct fib6_table *table; 1690 struct net *net = dev_net(rt->dst.dev); 1691 1692 if (rt == net->ipv6.ip6_null_entry) { 1693 err = -ENOENT; 1694 goto out; 1695 } 1696 1697 table = rt->rt6i_table; 1698 write_lock_bh(&table->tb6_lock); 1699 err = fib6_del(rt, info); 1700 write_unlock_bh(&table->tb6_lock); 1701 1702 out: 1703 ip6_rt_put(rt); 1704 return err; 1705 } 1706 1707 int ip6_del_rt(struct rt6_info *rt) 1708 { 1709 struct nl_info info = { 1710 .nl_net = dev_net(rt->dst.dev), 1711 }; 1712 return __ip6_del_rt(rt, &info); 1713 } 1714 1715 static int ip6_route_del(struct fib6_config *cfg) 1716 { 1717 struct fib6_table *table; 1718 struct fib6_node *fn; 1719 struct rt6_info *rt; 1720 int err = -ESRCH; 1721 1722 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); 1723 if (!table) 1724 return err; 1725 1726 read_lock_bh(&table->tb6_lock); 1727 1728 fn = fib6_locate(&table->tb6_root, 1729 &cfg->fc_dst, cfg->fc_dst_len, 1730 &cfg->fc_src, cfg->fc_src_len); 1731 1732 if (fn) { 1733 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1734 if (cfg->fc_ifindex && 1735 (!rt->dst.dev || 1736 rt->dst.dev->ifindex != cfg->fc_ifindex)) 1737 continue; 1738 if (cfg->fc_flags & RTF_GATEWAY && 1739 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) 1740 continue; 1741 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) 1742 continue; 1743 dst_hold(&rt->dst); 1744 read_unlock_bh(&table->tb6_lock); 1745 1746 return __ip6_del_rt(rt, &cfg->fc_nlinfo); 1747 } 1748 } 1749 read_unlock_bh(&table->tb6_lock); 1750 1751 return err; 1752 } 1753 1754 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) 1755 { 1756 struct net *net = dev_net(skb->dev); 1757 struct netevent_redirect netevent; 1758 struct rt6_info *rt, *nrt = NULL; 1759 struct ndisc_options ndopts; 1760 struct inet6_dev *in6_dev; 1761 struct neighbour *neigh; 1762 struct rd_msg *msg; 1763 int optlen, on_link; 1764 u8 *lladdr; 1765 1766 optlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1767 optlen -= sizeof(*msg); 1768 1769 if (optlen < 0) { 1770 net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); 1771 return; 1772 } 1773 1774 msg = (struct rd_msg *)icmp6_hdr(skb); 1775 1776 if (ipv6_addr_is_multicast(&msg->dest)) { 1777 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); 1778 return; 1779 } 1780 1781 on_link = 0; 1782 if (ipv6_addr_equal(&msg->dest, &msg->target)) { 1783 on_link = 1; 1784 } else if (ipv6_addr_type(&msg->target) != 1785 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { 1786 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); 1787 return; 1788 } 1789 1790 in6_dev = __in6_dev_get(skb->dev); 1791 if (!in6_dev) 1792 return; 1793 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) 1794 return; 1795 1796 /* RFC2461 8.1: 1797 * The IP source address of the Redirect MUST be the same as the current 1798 * first-hop router for the specified ICMP Destination Address. 1799 */ 1800 1801 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { 1802 net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); 1803 return; 1804 } 1805 1806 lladdr = NULL; 1807 if (ndopts.nd_opts_tgt_lladdr) { 1808 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, 1809 skb->dev); 1810 if (!lladdr) { 1811 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); 1812 return; 1813 } 1814 } 1815 1816 rt = (struct rt6_info *) dst; 1817 if (rt == net->ipv6.ip6_null_entry) { 1818 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); 1819 return; 1820 } 1821 1822 /* Redirect received -> path was valid. 1823 * Look, redirects are sent only in response to data packets, 1824 * so that this nexthop apparently is reachable. --ANK 1825 */ 1826 dst_confirm(&rt->dst); 1827 1828 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); 1829 if (!neigh) 1830 return; 1831 1832 /* 1833 * We have finally decided to accept it. 1834 */ 1835 1836 neigh_update(neigh, lladdr, NUD_STALE, 1837 NEIGH_UPDATE_F_WEAK_OVERRIDE| 1838 NEIGH_UPDATE_F_OVERRIDE| 1839 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| 1840 NEIGH_UPDATE_F_ISROUTER)) 1841 ); 1842 1843 nrt = ip6_rt_copy(rt, &msg->dest); 1844 if (!nrt) 1845 goto out; 1846 1847 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; 1848 if (on_link) 1849 nrt->rt6i_flags &= ~RTF_GATEWAY; 1850 1851 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; 1852 1853 if (ip6_ins_rt(nrt)) 1854 goto out; 1855 1856 netevent.old = &rt->dst; 1857 netevent.new = &nrt->dst; 1858 netevent.daddr = &msg->dest; 1859 netevent.neigh = neigh; 1860 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); 1861 1862 if (rt->rt6i_flags & RTF_CACHE) { 1863 rt = (struct rt6_info *) dst_clone(&rt->dst); 1864 ip6_del_rt(rt); 1865 } 1866 1867 out: 1868 neigh_release(neigh); 1869 } 1870 1871 /* 1872 * Misc support functions 1873 */ 1874 1875 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 1876 const struct in6_addr *dest) 1877 { 1878 struct net *net = dev_net(ort->dst.dev); 1879 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, 1880 ort->rt6i_table); 1881 1882 if (rt) { 1883 rt->dst.input = ort->dst.input; 1884 rt->dst.output = ort->dst.output; 1885 rt->dst.flags |= DST_HOST; 1886 1887 rt->rt6i_dst.addr = *dest; 1888 rt->rt6i_dst.plen = 128; 1889 dst_copy_metrics(&rt->dst, &ort->dst); 1890 rt->dst.error = ort->dst.error; 1891 rt->rt6i_idev = ort->rt6i_idev; 1892 if (rt->rt6i_idev) 1893 in6_dev_hold(rt->rt6i_idev); 1894 rt->dst.lastuse = jiffies; 1895 1896 if (ort->rt6i_flags & RTF_GATEWAY) 1897 rt->rt6i_gateway = ort->rt6i_gateway; 1898 else 1899 rt->rt6i_gateway = *dest; 1900 rt->rt6i_flags = ort->rt6i_flags; 1901 rt6_set_from(rt, ort); 1902 rt->rt6i_metric = 0; 1903 1904 #ifdef CONFIG_IPV6_SUBTREES 1905 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1906 #endif 1907 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); 1908 rt->rt6i_table = ort->rt6i_table; 1909 } 1910 return rt; 1911 } 1912 1913 #ifdef CONFIG_IPV6_ROUTE_INFO 1914 static struct rt6_info *rt6_get_route_info(struct net *net, 1915 const struct in6_addr *prefix, int prefixlen, 1916 const struct in6_addr *gwaddr, int ifindex) 1917 { 1918 struct fib6_node *fn; 1919 struct rt6_info *rt = NULL; 1920 struct fib6_table *table; 1921 1922 table = fib6_get_table(net, RT6_TABLE_INFO); 1923 if (!table) 1924 return NULL; 1925 1926 read_lock_bh(&table->tb6_lock); 1927 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); 1928 if (!fn) 1929 goto out; 1930 1931 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1932 if (rt->dst.dev->ifindex != ifindex) 1933 continue; 1934 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) 1935 continue; 1936 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) 1937 continue; 1938 dst_hold(&rt->dst); 1939 break; 1940 } 1941 out: 1942 read_unlock_bh(&table->tb6_lock); 1943 return rt; 1944 } 1945 1946 static struct rt6_info *rt6_add_route_info(struct net *net, 1947 const struct in6_addr *prefix, int prefixlen, 1948 const struct in6_addr *gwaddr, int ifindex, 1949 unsigned int pref) 1950 { 1951 struct fib6_config cfg = { 1952 .fc_table = RT6_TABLE_INFO, 1953 .fc_metric = IP6_RT_PRIO_USER, 1954 .fc_ifindex = ifindex, 1955 .fc_dst_len = prefixlen, 1956 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | 1957 RTF_UP | RTF_PREF(pref), 1958 .fc_nlinfo.portid = 0, 1959 .fc_nlinfo.nlh = NULL, 1960 .fc_nlinfo.nl_net = net, 1961 }; 1962 1963 cfg.fc_dst = *prefix; 1964 cfg.fc_gateway = *gwaddr; 1965 1966 /* We should treat it as a default route if prefix length is 0. */ 1967 if (!prefixlen) 1968 cfg.fc_flags |= RTF_DEFAULT; 1969 1970 ip6_route_add(&cfg); 1971 1972 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); 1973 } 1974 #endif 1975 1976 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) 1977 { 1978 struct rt6_info *rt; 1979 struct fib6_table *table; 1980 1981 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); 1982 if (!table) 1983 return NULL; 1984 1985 read_lock_bh(&table->tb6_lock); 1986 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { 1987 if (dev == rt->dst.dev && 1988 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && 1989 ipv6_addr_equal(&rt->rt6i_gateway, addr)) 1990 break; 1991 } 1992 if (rt) 1993 dst_hold(&rt->dst); 1994 read_unlock_bh(&table->tb6_lock); 1995 return rt; 1996 } 1997 1998 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 1999 struct net_device *dev, 2000 unsigned int pref) 2001 { 2002 struct fib6_config cfg = { 2003 .fc_table = RT6_TABLE_DFLT, 2004 .fc_metric = IP6_RT_PRIO_USER, 2005 .fc_ifindex = dev->ifindex, 2006 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | 2007 RTF_UP | RTF_EXPIRES | RTF_PREF(pref), 2008 .fc_nlinfo.portid = 0, 2009 .fc_nlinfo.nlh = NULL, 2010 .fc_nlinfo.nl_net = dev_net(dev), 2011 }; 2012 2013 cfg.fc_gateway = *gwaddr; 2014 2015 ip6_route_add(&cfg); 2016 2017 return rt6_get_dflt_router(gwaddr, dev); 2018 } 2019 2020 void rt6_purge_dflt_routers(struct net *net) 2021 { 2022 struct rt6_info *rt; 2023 struct fib6_table *table; 2024 2025 /* NOTE: Keep consistent with rt6_get_dflt_router */ 2026 table = fib6_get_table(net, RT6_TABLE_DFLT); 2027 if (!table) 2028 return; 2029 2030 restart: 2031 read_lock_bh(&table->tb6_lock); 2032 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { 2033 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && 2034 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { 2035 dst_hold(&rt->dst); 2036 read_unlock_bh(&table->tb6_lock); 2037 ip6_del_rt(rt); 2038 goto restart; 2039 } 2040 } 2041 read_unlock_bh(&table->tb6_lock); 2042 } 2043 2044 static void rtmsg_to_fib6_config(struct net *net, 2045 struct in6_rtmsg *rtmsg, 2046 struct fib6_config *cfg) 2047 { 2048 memset(cfg, 0, sizeof(*cfg)); 2049 2050 cfg->fc_table = RT6_TABLE_MAIN; 2051 cfg->fc_ifindex = rtmsg->rtmsg_ifindex; 2052 cfg->fc_metric = rtmsg->rtmsg_metric; 2053 cfg->fc_expires = rtmsg->rtmsg_info; 2054 cfg->fc_dst_len = rtmsg->rtmsg_dst_len; 2055 cfg->fc_src_len = rtmsg->rtmsg_src_len; 2056 cfg->fc_flags = rtmsg->rtmsg_flags; 2057 2058 cfg->fc_nlinfo.nl_net = net; 2059 2060 cfg->fc_dst = rtmsg->rtmsg_dst; 2061 cfg->fc_src = rtmsg->rtmsg_src; 2062 cfg->fc_gateway = rtmsg->rtmsg_gateway; 2063 } 2064 2065 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) 2066 { 2067 struct fib6_config cfg; 2068 struct in6_rtmsg rtmsg; 2069 int err; 2070 2071 switch(cmd) { 2072 case SIOCADDRT: /* Add a route */ 2073 case SIOCDELRT: /* Delete a route */ 2074 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2075 return -EPERM; 2076 err = copy_from_user(&rtmsg, arg, 2077 sizeof(struct in6_rtmsg)); 2078 if (err) 2079 return -EFAULT; 2080 2081 rtmsg_to_fib6_config(net, &rtmsg, &cfg); 2082 2083 rtnl_lock(); 2084 switch (cmd) { 2085 case SIOCADDRT: 2086 err = ip6_route_add(&cfg); 2087 break; 2088 case SIOCDELRT: 2089 err = ip6_route_del(&cfg); 2090 break; 2091 default: 2092 err = -EINVAL; 2093 } 2094 rtnl_unlock(); 2095 2096 return err; 2097 } 2098 2099 return -EINVAL; 2100 } 2101 2102 /* 2103 * Drop the packet on the floor 2104 */ 2105 2106 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) 2107 { 2108 int type; 2109 struct dst_entry *dst = skb_dst(skb); 2110 switch (ipstats_mib_noroutes) { 2111 case IPSTATS_MIB_INNOROUTES: 2112 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); 2113 if (type == IPV6_ADDR_ANY) { 2114 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2115 IPSTATS_MIB_INADDRERRORS); 2116 break; 2117 } 2118 /* FALLTHROUGH */ 2119 case IPSTATS_MIB_OUTNOROUTES: 2120 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2121 ipstats_mib_noroutes); 2122 break; 2123 } 2124 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); 2125 kfree_skb(skb); 2126 return 0; 2127 } 2128 2129 static int ip6_pkt_discard(struct sk_buff *skb) 2130 { 2131 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); 2132 } 2133 2134 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) 2135 { 2136 skb->dev = skb_dst(skb)->dev; 2137 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); 2138 } 2139 2140 static int ip6_pkt_prohibit(struct sk_buff *skb) 2141 { 2142 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); 2143 } 2144 2145 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) 2146 { 2147 skb->dev = skb_dst(skb)->dev; 2148 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); 2149 } 2150 2151 /* 2152 * Allocate a dst for local (unicast / anycast) address. 2153 */ 2154 2155 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 2156 const struct in6_addr *addr, 2157 bool anycast) 2158 { 2159 struct net *net = dev_net(idev->dev); 2160 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 2161 DST_NOCOUNT, NULL); 2162 if (!rt) 2163 return ERR_PTR(-ENOMEM); 2164 2165 in6_dev_hold(idev); 2166 2167 rt->dst.flags |= DST_HOST; 2168 rt->dst.input = ip6_input; 2169 rt->dst.output = ip6_output; 2170 rt->rt6i_idev = idev; 2171 2172 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; 2173 if (anycast) 2174 rt->rt6i_flags |= RTF_ANYCAST; 2175 else 2176 rt->rt6i_flags |= RTF_LOCAL; 2177 2178 rt->rt6i_gateway = *addr; 2179 rt->rt6i_dst.addr = *addr; 2180 rt->rt6i_dst.plen = 128; 2181 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); 2182 2183 atomic_set(&rt->dst.__refcnt, 1); 2184 2185 return rt; 2186 } 2187 2188 int ip6_route_get_saddr(struct net *net, 2189 struct rt6_info *rt, 2190 const struct in6_addr *daddr, 2191 unsigned int prefs, 2192 struct in6_addr *saddr) 2193 { 2194 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); 2195 int err = 0; 2196 if (rt->rt6i_prefsrc.plen) 2197 *saddr = rt->rt6i_prefsrc.addr; 2198 else 2199 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 2200 daddr, prefs, saddr); 2201 return err; 2202 } 2203 2204 /* remove deleted ip from prefsrc entries */ 2205 struct arg_dev_net_ip { 2206 struct net_device *dev; 2207 struct net *net; 2208 struct in6_addr *addr; 2209 }; 2210 2211 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) 2212 { 2213 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; 2214 struct net *net = ((struct arg_dev_net_ip *)arg)->net; 2215 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; 2216 2217 if (((void *)rt->dst.dev == dev || !dev) && 2218 rt != net->ipv6.ip6_null_entry && 2219 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { 2220 /* remove prefsrc entry */ 2221 rt->rt6i_prefsrc.plen = 0; 2222 } 2223 return 0; 2224 } 2225 2226 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) 2227 { 2228 struct net *net = dev_net(ifp->idev->dev); 2229 struct arg_dev_net_ip adni = { 2230 .dev = ifp->idev->dev, 2231 .net = net, 2232 .addr = &ifp->addr, 2233 }; 2234 fib6_clean_all(net, fib6_remove_prefsrc, &adni); 2235 } 2236 2237 struct arg_dev_net { 2238 struct net_device *dev; 2239 struct net *net; 2240 }; 2241 2242 static int fib6_ifdown(struct rt6_info *rt, void *arg) 2243 { 2244 const struct arg_dev_net *adn = arg; 2245 const struct net_device *dev = adn->dev; 2246 2247 if ((rt->dst.dev == dev || !dev) && 2248 rt != adn->net->ipv6.ip6_null_entry) 2249 return -1; 2250 2251 return 0; 2252 } 2253 2254 void rt6_ifdown(struct net *net, struct net_device *dev) 2255 { 2256 struct arg_dev_net adn = { 2257 .dev = dev, 2258 .net = net, 2259 }; 2260 2261 fib6_clean_all(net, fib6_ifdown, &adn); 2262 icmp6_clean_all(fib6_ifdown, &adn); 2263 } 2264 2265 struct rt6_mtu_change_arg { 2266 struct net_device *dev; 2267 unsigned int mtu; 2268 }; 2269 2270 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) 2271 { 2272 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; 2273 struct inet6_dev *idev; 2274 2275 /* In IPv6 pmtu discovery is not optional, 2276 so that RTAX_MTU lock cannot disable it. 2277 We still use this lock to block changes 2278 caused by addrconf/ndisc. 2279 */ 2280 2281 idev = __in6_dev_get(arg->dev); 2282 if (!idev) 2283 return 0; 2284 2285 /* For administrative MTU increase, there is no way to discover 2286 IPv6 PMTU increase, so PMTU increase should be updated here. 2287 Since RFC 1981 doesn't include administrative MTU increase 2288 update PMTU increase is a MUST. (i.e. jumbo frame) 2289 */ 2290 /* 2291 If new MTU is less than route PMTU, this new MTU will be the 2292 lowest MTU in the path, update the route PMTU to reflect PMTU 2293 decreases; if new MTU is greater than route PMTU, and the 2294 old MTU is the lowest MTU in the path, update the route PMTU 2295 to reflect the increase. In this case if the other nodes' MTU 2296 also have the lowest MTU, TOO BIG MESSAGE will be lead to 2297 PMTU discouvery. 2298 */ 2299 if (rt->dst.dev == arg->dev && 2300 !dst_metric_locked(&rt->dst, RTAX_MTU) && 2301 (dst_mtu(&rt->dst) >= arg->mtu || 2302 (dst_mtu(&rt->dst) < arg->mtu && 2303 dst_mtu(&rt->dst) == idev->cnf.mtu6))) { 2304 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); 2305 } 2306 return 0; 2307 } 2308 2309 void rt6_mtu_change(struct net_device *dev, unsigned int mtu) 2310 { 2311 struct rt6_mtu_change_arg arg = { 2312 .dev = dev, 2313 .mtu = mtu, 2314 }; 2315 2316 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); 2317 } 2318 2319 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { 2320 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, 2321 [RTA_OIF] = { .type = NLA_U32 }, 2322 [RTA_IIF] = { .type = NLA_U32 }, 2323 [RTA_PRIORITY] = { .type = NLA_U32 }, 2324 [RTA_METRICS] = { .type = NLA_NESTED }, 2325 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 2326 }; 2327 2328 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, 2329 struct fib6_config *cfg) 2330 { 2331 struct rtmsg *rtm; 2332 struct nlattr *tb[RTA_MAX+1]; 2333 int err; 2334 2335 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2336 if (err < 0) 2337 goto errout; 2338 2339 err = -EINVAL; 2340 rtm = nlmsg_data(nlh); 2341 memset(cfg, 0, sizeof(*cfg)); 2342 2343 cfg->fc_table = rtm->rtm_table; 2344 cfg->fc_dst_len = rtm->rtm_dst_len; 2345 cfg->fc_src_len = rtm->rtm_src_len; 2346 cfg->fc_flags = RTF_UP; 2347 cfg->fc_protocol = rtm->rtm_protocol; 2348 cfg->fc_type = rtm->rtm_type; 2349 2350 if (rtm->rtm_type == RTN_UNREACHABLE || 2351 rtm->rtm_type == RTN_BLACKHOLE || 2352 rtm->rtm_type == RTN_PROHIBIT || 2353 rtm->rtm_type == RTN_THROW) 2354 cfg->fc_flags |= RTF_REJECT; 2355 2356 if (rtm->rtm_type == RTN_LOCAL) 2357 cfg->fc_flags |= RTF_LOCAL; 2358 2359 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 2360 cfg->fc_nlinfo.nlh = nlh; 2361 cfg->fc_nlinfo.nl_net = sock_net(skb->sk); 2362 2363 if (tb[RTA_GATEWAY]) { 2364 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); 2365 cfg->fc_flags |= RTF_GATEWAY; 2366 } 2367 2368 if (tb[RTA_DST]) { 2369 int plen = (rtm->rtm_dst_len + 7) >> 3; 2370 2371 if (nla_len(tb[RTA_DST]) < plen) 2372 goto errout; 2373 2374 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); 2375 } 2376 2377 if (tb[RTA_SRC]) { 2378 int plen = (rtm->rtm_src_len + 7) >> 3; 2379 2380 if (nla_len(tb[RTA_SRC]) < plen) 2381 goto errout; 2382 2383 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); 2384 } 2385 2386 if (tb[RTA_PREFSRC]) 2387 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); 2388 2389 if (tb[RTA_OIF]) 2390 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); 2391 2392 if (tb[RTA_PRIORITY]) 2393 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); 2394 2395 if (tb[RTA_METRICS]) { 2396 cfg->fc_mx = nla_data(tb[RTA_METRICS]); 2397 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); 2398 } 2399 2400 if (tb[RTA_TABLE]) 2401 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); 2402 2403 if (tb[RTA_MULTIPATH]) { 2404 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); 2405 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); 2406 } 2407 2408 err = 0; 2409 errout: 2410 return err; 2411 } 2412 2413 static int ip6_route_multipath(struct fib6_config *cfg, int add) 2414 { 2415 struct fib6_config r_cfg; 2416 struct rtnexthop *rtnh; 2417 int remaining; 2418 int attrlen; 2419 int err = 0, last_err = 0; 2420 2421 beginning: 2422 rtnh = (struct rtnexthop *)cfg->fc_mp; 2423 remaining = cfg->fc_mp_len; 2424 2425 /* Parse a Multipath Entry */ 2426 while (rtnh_ok(rtnh, remaining)) { 2427 memcpy(&r_cfg, cfg, sizeof(*cfg)); 2428 if (rtnh->rtnh_ifindex) 2429 r_cfg.fc_ifindex = rtnh->rtnh_ifindex; 2430 2431 attrlen = rtnh_attrlen(rtnh); 2432 if (attrlen > 0) { 2433 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 2434 2435 nla = nla_find(attrs, attrlen, RTA_GATEWAY); 2436 if (nla) { 2437 nla_memcpy(&r_cfg.fc_gateway, nla, 16); 2438 r_cfg.fc_flags |= RTF_GATEWAY; 2439 } 2440 } 2441 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); 2442 if (err) { 2443 last_err = err; 2444 /* If we are trying to remove a route, do not stop the 2445 * loop when ip6_route_del() fails (because next hop is 2446 * already gone), we should try to remove all next hops. 2447 */ 2448 if (add) { 2449 /* If add fails, we should try to delete all 2450 * next hops that have been already added. 2451 */ 2452 add = 0; 2453 goto beginning; 2454 } 2455 } 2456 /* Because each route is added like a single route we remove 2457 * this flag after the first nexthop (if there is a collision, 2458 * we have already fail to add the first nexthop: 2459 * fib6_add_rt2node() has reject it). 2460 */ 2461 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; 2462 rtnh = rtnh_next(rtnh, &remaining); 2463 } 2464 2465 return last_err; 2466 } 2467 2468 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) 2469 { 2470 struct fib6_config cfg; 2471 int err; 2472 2473 err = rtm_to_fib6_config(skb, nlh, &cfg); 2474 if (err < 0) 2475 return err; 2476 2477 if (cfg.fc_mp) 2478 return ip6_route_multipath(&cfg, 0); 2479 else 2480 return ip6_route_del(&cfg); 2481 } 2482 2483 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) 2484 { 2485 struct fib6_config cfg; 2486 int err; 2487 2488 err = rtm_to_fib6_config(skb, nlh, &cfg); 2489 if (err < 0) 2490 return err; 2491 2492 if (cfg.fc_mp) 2493 return ip6_route_multipath(&cfg, 1); 2494 else 2495 return ip6_route_add(&cfg); 2496 } 2497 2498 static inline size_t rt6_nlmsg_size(void) 2499 { 2500 return NLMSG_ALIGN(sizeof(struct rtmsg)) 2501 + nla_total_size(16) /* RTA_SRC */ 2502 + nla_total_size(16) /* RTA_DST */ 2503 + nla_total_size(16) /* RTA_GATEWAY */ 2504 + nla_total_size(16) /* RTA_PREFSRC */ 2505 + nla_total_size(4) /* RTA_TABLE */ 2506 + nla_total_size(4) /* RTA_IIF */ 2507 + nla_total_size(4) /* RTA_OIF */ 2508 + nla_total_size(4) /* RTA_PRIORITY */ 2509 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ 2510 + nla_total_size(sizeof(struct rta_cacheinfo)); 2511 } 2512 2513 static int rt6_fill_node(struct net *net, 2514 struct sk_buff *skb, struct rt6_info *rt, 2515 struct in6_addr *dst, struct in6_addr *src, 2516 int iif, int type, u32 portid, u32 seq, 2517 int prefix, int nowait, unsigned int flags) 2518 { 2519 struct rtmsg *rtm; 2520 struct nlmsghdr *nlh; 2521 long expires; 2522 u32 table; 2523 2524 if (prefix) { /* user wants prefix routes only */ 2525 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { 2526 /* success since this is not a prefix route */ 2527 return 1; 2528 } 2529 } 2530 2531 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); 2532 if (!nlh) 2533 return -EMSGSIZE; 2534 2535 rtm = nlmsg_data(nlh); 2536 rtm->rtm_family = AF_INET6; 2537 rtm->rtm_dst_len = rt->rt6i_dst.plen; 2538 rtm->rtm_src_len = rt->rt6i_src.plen; 2539 rtm->rtm_tos = 0; 2540 if (rt->rt6i_table) 2541 table = rt->rt6i_table->tb6_id; 2542 else 2543 table = RT6_TABLE_UNSPEC; 2544 rtm->rtm_table = table; 2545 if (nla_put_u32(skb, RTA_TABLE, table)) 2546 goto nla_put_failure; 2547 if (rt->rt6i_flags & RTF_REJECT) { 2548 switch (rt->dst.error) { 2549 case -EINVAL: 2550 rtm->rtm_type = RTN_BLACKHOLE; 2551 break; 2552 case -EACCES: 2553 rtm->rtm_type = RTN_PROHIBIT; 2554 break; 2555 case -EAGAIN: 2556 rtm->rtm_type = RTN_THROW; 2557 break; 2558 default: 2559 rtm->rtm_type = RTN_UNREACHABLE; 2560 break; 2561 } 2562 } 2563 else if (rt->rt6i_flags & RTF_LOCAL) 2564 rtm->rtm_type = RTN_LOCAL; 2565 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) 2566 rtm->rtm_type = RTN_LOCAL; 2567 else 2568 rtm->rtm_type = RTN_UNICAST; 2569 rtm->rtm_flags = 0; 2570 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2571 rtm->rtm_protocol = rt->rt6i_protocol; 2572 if (rt->rt6i_flags & RTF_DYNAMIC) 2573 rtm->rtm_protocol = RTPROT_REDIRECT; 2574 else if (rt->rt6i_flags & RTF_ADDRCONF) { 2575 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) 2576 rtm->rtm_protocol = RTPROT_RA; 2577 else 2578 rtm->rtm_protocol = RTPROT_KERNEL; 2579 } 2580 2581 if (rt->rt6i_flags & RTF_CACHE) 2582 rtm->rtm_flags |= RTM_F_CLONED; 2583 2584 if (dst) { 2585 if (nla_put(skb, RTA_DST, 16, dst)) 2586 goto nla_put_failure; 2587 rtm->rtm_dst_len = 128; 2588 } else if (rtm->rtm_dst_len) 2589 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) 2590 goto nla_put_failure; 2591 #ifdef CONFIG_IPV6_SUBTREES 2592 if (src) { 2593 if (nla_put(skb, RTA_SRC, 16, src)) 2594 goto nla_put_failure; 2595 rtm->rtm_src_len = 128; 2596 } else if (rtm->rtm_src_len && 2597 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) 2598 goto nla_put_failure; 2599 #endif 2600 if (iif) { 2601 #ifdef CONFIG_IPV6_MROUTE 2602 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { 2603 int err = ip6mr_get_route(net, skb, rtm, nowait); 2604 if (err <= 0) { 2605 if (!nowait) { 2606 if (err == 0) 2607 return 0; 2608 goto nla_put_failure; 2609 } else { 2610 if (err == -EMSGSIZE) 2611 goto nla_put_failure; 2612 } 2613 } 2614 } else 2615 #endif 2616 if (nla_put_u32(skb, RTA_IIF, iif)) 2617 goto nla_put_failure; 2618 } else if (dst) { 2619 struct in6_addr saddr_buf; 2620 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && 2621 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2622 goto nla_put_failure; 2623 } 2624 2625 if (rt->rt6i_prefsrc.plen) { 2626 struct in6_addr saddr_buf; 2627 saddr_buf = rt->rt6i_prefsrc.addr; 2628 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2629 goto nla_put_failure; 2630 } 2631 2632 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) 2633 goto nla_put_failure; 2634 2635 if (rt->rt6i_flags & RTF_GATEWAY) { 2636 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) 2637 goto nla_put_failure; 2638 } 2639 2640 if (rt->dst.dev && 2641 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) 2642 goto nla_put_failure; 2643 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) 2644 goto nla_put_failure; 2645 2646 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; 2647 2648 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) 2649 goto nla_put_failure; 2650 2651 return nlmsg_end(skb, nlh); 2652 2653 nla_put_failure: 2654 nlmsg_cancel(skb, nlh); 2655 return -EMSGSIZE; 2656 } 2657 2658 int rt6_dump_route(struct rt6_info *rt, void *p_arg) 2659 { 2660 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; 2661 int prefix; 2662 2663 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { 2664 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); 2665 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; 2666 } else 2667 prefix = 0; 2668 2669 return rt6_fill_node(arg->net, 2670 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, 2671 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, 2672 prefix, 0, NLM_F_MULTI); 2673 } 2674 2675 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) 2676 { 2677 struct net *net = sock_net(in_skb->sk); 2678 struct nlattr *tb[RTA_MAX+1]; 2679 struct rt6_info *rt; 2680 struct sk_buff *skb; 2681 struct rtmsg *rtm; 2682 struct flowi6 fl6; 2683 int err, iif = 0, oif = 0; 2684 2685 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2686 if (err < 0) 2687 goto errout; 2688 2689 err = -EINVAL; 2690 memset(&fl6, 0, sizeof(fl6)); 2691 2692 if (tb[RTA_SRC]) { 2693 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) 2694 goto errout; 2695 2696 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); 2697 } 2698 2699 if (tb[RTA_DST]) { 2700 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) 2701 goto errout; 2702 2703 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); 2704 } 2705 2706 if (tb[RTA_IIF]) 2707 iif = nla_get_u32(tb[RTA_IIF]); 2708 2709 if (tb[RTA_OIF]) 2710 oif = nla_get_u32(tb[RTA_OIF]); 2711 2712 if (iif) { 2713 struct net_device *dev; 2714 int flags = 0; 2715 2716 dev = __dev_get_by_index(net, iif); 2717 if (!dev) { 2718 err = -ENODEV; 2719 goto errout; 2720 } 2721 2722 fl6.flowi6_iif = iif; 2723 2724 if (!ipv6_addr_any(&fl6.saddr)) 2725 flags |= RT6_LOOKUP_F_HAS_SADDR; 2726 2727 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, 2728 flags); 2729 } else { 2730 fl6.flowi6_oif = oif; 2731 2732 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); 2733 } 2734 2735 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2736 if (!skb) { 2737 ip6_rt_put(rt); 2738 err = -ENOBUFS; 2739 goto errout; 2740 } 2741 2742 /* Reserve room for dummy headers, this skb can pass 2743 through good chunk of routing engine. 2744 */ 2745 skb_reset_mac_header(skb); 2746 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); 2747 2748 skb_dst_set(skb, &rt->dst); 2749 2750 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, 2751 RTM_NEWROUTE, NETLINK_CB(in_skb).portid, 2752 nlh->nlmsg_seq, 0, 0, 0); 2753 if (err < 0) { 2754 kfree_skb(skb); 2755 goto errout; 2756 } 2757 2758 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2759 errout: 2760 return err; 2761 } 2762 2763 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) 2764 { 2765 struct sk_buff *skb; 2766 struct net *net = info->nl_net; 2767 u32 seq; 2768 int err; 2769 2770 err = -ENOBUFS; 2771 seq = info->nlh ? info->nlh->nlmsg_seq : 0; 2772 2773 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); 2774 if (!skb) 2775 goto errout; 2776 2777 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, 2778 event, info->portid, seq, 0, 0, 0); 2779 if (err < 0) { 2780 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ 2781 WARN_ON(err == -EMSGSIZE); 2782 kfree_skb(skb); 2783 goto errout; 2784 } 2785 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, 2786 info->nlh, gfp_any()); 2787 return; 2788 errout: 2789 if (err < 0) 2790 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); 2791 } 2792 2793 static int ip6_route_dev_notify(struct notifier_block *this, 2794 unsigned long event, void *ptr) 2795 { 2796 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2797 struct net *net = dev_net(dev); 2798 2799 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { 2800 net->ipv6.ip6_null_entry->dst.dev = dev; 2801 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); 2802 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 2803 net->ipv6.ip6_prohibit_entry->dst.dev = dev; 2804 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); 2805 net->ipv6.ip6_blk_hole_entry->dst.dev = dev; 2806 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); 2807 #endif 2808 } 2809 2810 return NOTIFY_OK; 2811 } 2812 2813 /* 2814 * /proc 2815 */ 2816 2817 #ifdef CONFIG_PROC_FS 2818 2819 static const struct file_operations ipv6_route_proc_fops = { 2820 .owner = THIS_MODULE, 2821 .open = ipv6_route_open, 2822 .read = seq_read, 2823 .llseek = seq_lseek, 2824 .release = seq_release_net, 2825 }; 2826 2827 static int rt6_stats_seq_show(struct seq_file *seq, void *v) 2828 { 2829 struct net *net = (struct net *)seq->private; 2830 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", 2831 net->ipv6.rt6_stats->fib_nodes, 2832 net->ipv6.rt6_stats->fib_route_nodes, 2833 net->ipv6.rt6_stats->fib_rt_alloc, 2834 net->ipv6.rt6_stats->fib_rt_entries, 2835 net->ipv6.rt6_stats->fib_rt_cache, 2836 dst_entries_get_slow(&net->ipv6.ip6_dst_ops), 2837 net->ipv6.rt6_stats->fib_discarded_routes); 2838 2839 return 0; 2840 } 2841 2842 static int rt6_stats_seq_open(struct inode *inode, struct file *file) 2843 { 2844 return single_open_net(inode, file, rt6_stats_seq_show); 2845 } 2846 2847 static const struct file_operations rt6_stats_seq_fops = { 2848 .owner = THIS_MODULE, 2849 .open = rt6_stats_seq_open, 2850 .read = seq_read, 2851 .llseek = seq_lseek, 2852 .release = single_release_net, 2853 }; 2854 #endif /* CONFIG_PROC_FS */ 2855 2856 #ifdef CONFIG_SYSCTL 2857 2858 static 2859 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, 2860 void __user *buffer, size_t *lenp, loff_t *ppos) 2861 { 2862 struct net *net; 2863 int delay; 2864 if (!write) 2865 return -EINVAL; 2866 2867 net = (struct net *)ctl->extra1; 2868 delay = net->ipv6.sysctl.flush_delay; 2869 proc_dointvec(ctl, write, buffer, lenp, ppos); 2870 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); 2871 return 0; 2872 } 2873 2874 struct ctl_table ipv6_route_table_template[] = { 2875 { 2876 .procname = "flush", 2877 .data = &init_net.ipv6.sysctl.flush_delay, 2878 .maxlen = sizeof(int), 2879 .mode = 0200, 2880 .proc_handler = ipv6_sysctl_rtcache_flush 2881 }, 2882 { 2883 .procname = "gc_thresh", 2884 .data = &ip6_dst_ops_template.gc_thresh, 2885 .maxlen = sizeof(int), 2886 .mode = 0644, 2887 .proc_handler = proc_dointvec, 2888 }, 2889 { 2890 .procname = "max_size", 2891 .data = &init_net.ipv6.sysctl.ip6_rt_max_size, 2892 .maxlen = sizeof(int), 2893 .mode = 0644, 2894 .proc_handler = proc_dointvec, 2895 }, 2896 { 2897 .procname = "gc_min_interval", 2898 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 2899 .maxlen = sizeof(int), 2900 .mode = 0644, 2901 .proc_handler = proc_dointvec_jiffies, 2902 }, 2903 { 2904 .procname = "gc_timeout", 2905 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, 2906 .maxlen = sizeof(int), 2907 .mode = 0644, 2908 .proc_handler = proc_dointvec_jiffies, 2909 }, 2910 { 2911 .procname = "gc_interval", 2912 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, 2913 .maxlen = sizeof(int), 2914 .mode = 0644, 2915 .proc_handler = proc_dointvec_jiffies, 2916 }, 2917 { 2918 .procname = "gc_elasticity", 2919 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, 2920 .maxlen = sizeof(int), 2921 .mode = 0644, 2922 .proc_handler = proc_dointvec, 2923 }, 2924 { 2925 .procname = "mtu_expires", 2926 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, 2927 .maxlen = sizeof(int), 2928 .mode = 0644, 2929 .proc_handler = proc_dointvec_jiffies, 2930 }, 2931 { 2932 .procname = "min_adv_mss", 2933 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, 2934 .maxlen = sizeof(int), 2935 .mode = 0644, 2936 .proc_handler = proc_dointvec, 2937 }, 2938 { 2939 .procname = "gc_min_interval_ms", 2940 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 2941 .maxlen = sizeof(int), 2942 .mode = 0644, 2943 .proc_handler = proc_dointvec_ms_jiffies, 2944 }, 2945 { } 2946 }; 2947 2948 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) 2949 { 2950 struct ctl_table *table; 2951 2952 table = kmemdup(ipv6_route_table_template, 2953 sizeof(ipv6_route_table_template), 2954 GFP_KERNEL); 2955 2956 if (table) { 2957 table[0].data = &net->ipv6.sysctl.flush_delay; 2958 table[0].extra1 = net; 2959 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; 2960 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; 2961 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 2962 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; 2963 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; 2964 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; 2965 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; 2966 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; 2967 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 2968 2969 /* Don't export sysctls to unprivileged users */ 2970 if (net->user_ns != &init_user_ns) 2971 table[0].procname = NULL; 2972 } 2973 2974 return table; 2975 } 2976 #endif 2977 2978 static int __net_init ip6_route_net_init(struct net *net) 2979 { 2980 int ret = -ENOMEM; 2981 2982 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, 2983 sizeof(net->ipv6.ip6_dst_ops)); 2984 2985 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) 2986 goto out_ip6_dst_ops; 2987 2988 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, 2989 sizeof(*net->ipv6.ip6_null_entry), 2990 GFP_KERNEL); 2991 if (!net->ipv6.ip6_null_entry) 2992 goto out_ip6_dst_entries; 2993 net->ipv6.ip6_null_entry->dst.path = 2994 (struct dst_entry *)net->ipv6.ip6_null_entry; 2995 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; 2996 dst_init_metrics(&net->ipv6.ip6_null_entry->dst, 2997 ip6_template_metrics, true); 2998 2999 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3000 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, 3001 sizeof(*net->ipv6.ip6_prohibit_entry), 3002 GFP_KERNEL); 3003 if (!net->ipv6.ip6_prohibit_entry) 3004 goto out_ip6_null_entry; 3005 net->ipv6.ip6_prohibit_entry->dst.path = 3006 (struct dst_entry *)net->ipv6.ip6_prohibit_entry; 3007 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3008 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, 3009 ip6_template_metrics, true); 3010 3011 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, 3012 sizeof(*net->ipv6.ip6_blk_hole_entry), 3013 GFP_KERNEL); 3014 if (!net->ipv6.ip6_blk_hole_entry) 3015 goto out_ip6_prohibit_entry; 3016 net->ipv6.ip6_blk_hole_entry->dst.path = 3017 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; 3018 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3019 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, 3020 ip6_template_metrics, true); 3021 #endif 3022 3023 net->ipv6.sysctl.flush_delay = 0; 3024 net->ipv6.sysctl.ip6_rt_max_size = 4096; 3025 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; 3026 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; 3027 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; 3028 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; 3029 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; 3030 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; 3031 3032 net->ipv6.ip6_rt_gc_expire = 30*HZ; 3033 3034 ret = 0; 3035 out: 3036 return ret; 3037 3038 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3039 out_ip6_prohibit_entry: 3040 kfree(net->ipv6.ip6_prohibit_entry); 3041 out_ip6_null_entry: 3042 kfree(net->ipv6.ip6_null_entry); 3043 #endif 3044 out_ip6_dst_entries: 3045 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3046 out_ip6_dst_ops: 3047 goto out; 3048 } 3049 3050 static void __net_exit ip6_route_net_exit(struct net *net) 3051 { 3052 kfree(net->ipv6.ip6_null_entry); 3053 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3054 kfree(net->ipv6.ip6_prohibit_entry); 3055 kfree(net->ipv6.ip6_blk_hole_entry); 3056 #endif 3057 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3058 } 3059 3060 static int __net_init ip6_route_net_init_late(struct net *net) 3061 { 3062 #ifdef CONFIG_PROC_FS 3063 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); 3064 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); 3065 #endif 3066 return 0; 3067 } 3068 3069 static void __net_exit ip6_route_net_exit_late(struct net *net) 3070 { 3071 #ifdef CONFIG_PROC_FS 3072 remove_proc_entry("ipv6_route", net->proc_net); 3073 remove_proc_entry("rt6_stats", net->proc_net); 3074 #endif 3075 } 3076 3077 static struct pernet_operations ip6_route_net_ops = { 3078 .init = ip6_route_net_init, 3079 .exit = ip6_route_net_exit, 3080 }; 3081 3082 static int __net_init ipv6_inetpeer_init(struct net *net) 3083 { 3084 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); 3085 3086 if (!bp) 3087 return -ENOMEM; 3088 inet_peer_base_init(bp); 3089 net->ipv6.peers = bp; 3090 return 0; 3091 } 3092 3093 static void __net_exit ipv6_inetpeer_exit(struct net *net) 3094 { 3095 struct inet_peer_base *bp = net->ipv6.peers; 3096 3097 net->ipv6.peers = NULL; 3098 inetpeer_invalidate_tree(bp); 3099 kfree(bp); 3100 } 3101 3102 static struct pernet_operations ipv6_inetpeer_ops = { 3103 .init = ipv6_inetpeer_init, 3104 .exit = ipv6_inetpeer_exit, 3105 }; 3106 3107 static struct pernet_operations ip6_route_net_late_ops = { 3108 .init = ip6_route_net_init_late, 3109 .exit = ip6_route_net_exit_late, 3110 }; 3111 3112 static struct notifier_block ip6_route_dev_notifier = { 3113 .notifier_call = ip6_route_dev_notify, 3114 .priority = 0, 3115 }; 3116 3117 int __init ip6_route_init(void) 3118 { 3119 int ret; 3120 3121 ret = -ENOMEM; 3122 ip6_dst_ops_template.kmem_cachep = 3123 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, 3124 SLAB_HWCACHE_ALIGN, NULL); 3125 if (!ip6_dst_ops_template.kmem_cachep) 3126 goto out; 3127 3128 ret = dst_entries_init(&ip6_dst_blackhole_ops); 3129 if (ret) 3130 goto out_kmem_cache; 3131 3132 ret = register_pernet_subsys(&ipv6_inetpeer_ops); 3133 if (ret) 3134 goto out_dst_entries; 3135 3136 ret = register_pernet_subsys(&ip6_route_net_ops); 3137 if (ret) 3138 goto out_register_inetpeer; 3139 3140 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; 3141 3142 /* Registering of the loopback is done before this portion of code, 3143 * the loopback reference in rt6_info will not be taken, do it 3144 * manually for init_net */ 3145 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; 3146 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3147 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3148 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; 3149 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3150 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; 3151 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3152 #endif 3153 ret = fib6_init(); 3154 if (ret) 3155 goto out_register_subsys; 3156 3157 ret = xfrm6_init(); 3158 if (ret) 3159 goto out_fib6_init; 3160 3161 ret = fib6_rules_init(); 3162 if (ret) 3163 goto xfrm6_init; 3164 3165 ret = register_pernet_subsys(&ip6_route_net_late_ops); 3166 if (ret) 3167 goto fib6_rules_init; 3168 3169 ret = -ENOBUFS; 3170 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || 3171 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || 3172 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) 3173 goto out_register_late_subsys; 3174 3175 ret = register_netdevice_notifier(&ip6_route_dev_notifier); 3176 if (ret) 3177 goto out_register_late_subsys; 3178 3179 out: 3180 return ret; 3181 3182 out_register_late_subsys: 3183 unregister_pernet_subsys(&ip6_route_net_late_ops); 3184 fib6_rules_init: 3185 fib6_rules_cleanup(); 3186 xfrm6_init: 3187 xfrm6_fini(); 3188 out_fib6_init: 3189 fib6_gc_cleanup(); 3190 out_register_subsys: 3191 unregister_pernet_subsys(&ip6_route_net_ops); 3192 out_register_inetpeer: 3193 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3194 out_dst_entries: 3195 dst_entries_destroy(&ip6_dst_blackhole_ops); 3196 out_kmem_cache: 3197 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3198 goto out; 3199 } 3200 3201 void ip6_route_cleanup(void) 3202 { 3203 unregister_netdevice_notifier(&ip6_route_dev_notifier); 3204 unregister_pernet_subsys(&ip6_route_net_late_ops); 3205 fib6_rules_cleanup(); 3206 xfrm6_fini(); 3207 fib6_gc_cleanup(); 3208 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3209 unregister_pernet_subsys(&ip6_route_net_ops); 3210 dst_entries_destroy(&ip6_dst_blackhole_ops); 3211 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3212 } 3213