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 = -2, 70 RT6_NUD_FAIL_SOFT = -1, 71 RT6_NUD_SUCCEED = 1 72 }; 73 74 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 75 const struct in6_addr *dest); 76 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); 77 static unsigned int ip6_default_advmss(const struct dst_entry *dst); 78 static unsigned int ip6_mtu(const struct dst_entry *dst); 79 static struct dst_entry *ip6_negative_advice(struct dst_entry *); 80 static void ip6_dst_destroy(struct dst_entry *); 81 static void ip6_dst_ifdown(struct dst_entry *, 82 struct net_device *dev, int how); 83 static int ip6_dst_gc(struct dst_ops *ops); 84 85 static int ip6_pkt_discard(struct sk_buff *skb); 86 static int ip6_pkt_discard_out(struct sk_buff *skb); 87 static void ip6_link_failure(struct sk_buff *skb); 88 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, 89 struct sk_buff *skb, u32 mtu); 90 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, 91 struct sk_buff *skb); 92 static int rt6_score_route(struct rt6_info *rt, int oif, int strict); 93 94 #ifdef CONFIG_IPV6_ROUTE_INFO 95 static struct rt6_info *rt6_add_route_info(struct net *net, 96 const struct in6_addr *prefix, int prefixlen, 97 const struct in6_addr *gwaddr, int ifindex, 98 unsigned int pref); 99 static struct rt6_info *rt6_get_route_info(struct net *net, 100 const struct in6_addr *prefix, int prefixlen, 101 const struct in6_addr *gwaddr, int ifindex); 102 #endif 103 104 static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) 105 { 106 struct rt6_info *rt = (struct rt6_info *) dst; 107 struct inet_peer *peer; 108 u32 *p = NULL; 109 110 if (!(rt->dst.flags & DST_HOST)) 111 return NULL; 112 113 peer = rt6_get_peer_create(rt); 114 if (peer) { 115 u32 *old_p = __DST_METRICS_PTR(old); 116 unsigned long prev, new; 117 118 p = peer->metrics; 119 if (inet_metrics_new(peer)) 120 memcpy(p, old_p, sizeof(u32) * RTAX_MAX); 121 122 new = (unsigned long) p; 123 prev = cmpxchg(&dst->_metrics, old, new); 124 125 if (prev != old) { 126 p = __DST_METRICS_PTR(prev); 127 if (prev & DST_METRICS_READ_ONLY) 128 p = NULL; 129 } 130 } 131 return p; 132 } 133 134 static inline const void *choose_neigh_daddr(struct rt6_info *rt, 135 struct sk_buff *skb, 136 const void *daddr) 137 { 138 struct in6_addr *p = &rt->rt6i_gateway; 139 140 if (!ipv6_addr_any(p)) 141 return (const void *) p; 142 else if (skb) 143 return &ipv6_hdr(skb)->daddr; 144 return daddr; 145 } 146 147 static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, 148 struct sk_buff *skb, 149 const void *daddr) 150 { 151 struct rt6_info *rt = (struct rt6_info *) dst; 152 struct neighbour *n; 153 154 daddr = choose_neigh_daddr(rt, skb, daddr); 155 n = __ipv6_neigh_lookup(dst->dev, daddr); 156 if (n) 157 return n; 158 return neigh_create(&nd_tbl, daddr, dst->dev); 159 } 160 161 static struct dst_ops ip6_dst_ops_template = { 162 .family = AF_INET6, 163 .protocol = cpu_to_be16(ETH_P_IPV6), 164 .gc = ip6_dst_gc, 165 .gc_thresh = 1024, 166 .check = ip6_dst_check, 167 .default_advmss = ip6_default_advmss, 168 .mtu = ip6_mtu, 169 .cow_metrics = ipv6_cow_metrics, 170 .destroy = ip6_dst_destroy, 171 .ifdown = ip6_dst_ifdown, 172 .negative_advice = ip6_negative_advice, 173 .link_failure = ip6_link_failure, 174 .update_pmtu = ip6_rt_update_pmtu, 175 .redirect = rt6_do_redirect, 176 .local_out = __ip6_local_out, 177 .neigh_lookup = ip6_neigh_lookup, 178 }; 179 180 static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) 181 { 182 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); 183 184 return mtu ? : dst->dev->mtu; 185 } 186 187 static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk, 188 struct sk_buff *skb, u32 mtu) 189 { 190 } 191 192 static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk, 193 struct sk_buff *skb) 194 { 195 } 196 197 static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, 198 unsigned long old) 199 { 200 return NULL; 201 } 202 203 static struct dst_ops ip6_dst_blackhole_ops = { 204 .family = AF_INET6, 205 .protocol = cpu_to_be16(ETH_P_IPV6), 206 .destroy = ip6_dst_destroy, 207 .check = ip6_dst_check, 208 .mtu = ip6_blackhole_mtu, 209 .default_advmss = ip6_default_advmss, 210 .update_pmtu = ip6_rt_blackhole_update_pmtu, 211 .redirect = ip6_rt_blackhole_redirect, 212 .cow_metrics = ip6_rt_blackhole_cow_metrics, 213 .neigh_lookup = ip6_neigh_lookup, 214 }; 215 216 static const u32 ip6_template_metrics[RTAX_MAX] = { 217 [RTAX_HOPLIMIT - 1] = 0, 218 }; 219 220 static const struct rt6_info ip6_null_entry_template = { 221 .dst = { 222 .__refcnt = ATOMIC_INIT(1), 223 .__use = 1, 224 .obsolete = DST_OBSOLETE_FORCE_CHK, 225 .error = -ENETUNREACH, 226 .input = ip6_pkt_discard, 227 .output = ip6_pkt_discard_out, 228 }, 229 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 230 .rt6i_protocol = RTPROT_KERNEL, 231 .rt6i_metric = ~(u32) 0, 232 .rt6i_ref = ATOMIC_INIT(1), 233 }; 234 235 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 236 237 static int ip6_pkt_prohibit(struct sk_buff *skb); 238 static int ip6_pkt_prohibit_out(struct sk_buff *skb); 239 240 static const struct rt6_info ip6_prohibit_entry_template = { 241 .dst = { 242 .__refcnt = ATOMIC_INIT(1), 243 .__use = 1, 244 .obsolete = DST_OBSOLETE_FORCE_CHK, 245 .error = -EACCES, 246 .input = ip6_pkt_prohibit, 247 .output = ip6_pkt_prohibit_out, 248 }, 249 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 250 .rt6i_protocol = RTPROT_KERNEL, 251 .rt6i_metric = ~(u32) 0, 252 .rt6i_ref = ATOMIC_INIT(1), 253 }; 254 255 static const struct rt6_info ip6_blk_hole_entry_template = { 256 .dst = { 257 .__refcnt = ATOMIC_INIT(1), 258 .__use = 1, 259 .obsolete = DST_OBSOLETE_FORCE_CHK, 260 .error = -EINVAL, 261 .input = dst_discard, 262 .output = dst_discard, 263 }, 264 .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), 265 .rt6i_protocol = RTPROT_KERNEL, 266 .rt6i_metric = ~(u32) 0, 267 .rt6i_ref = ATOMIC_INIT(1), 268 }; 269 270 #endif 271 272 /* allocate dst with ip6_dst_ops */ 273 static inline struct rt6_info *ip6_dst_alloc(struct net *net, 274 struct net_device *dev, 275 int flags, 276 struct fib6_table *table) 277 { 278 struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev, 279 0, DST_OBSOLETE_FORCE_CHK, flags); 280 281 if (rt) { 282 struct dst_entry *dst = &rt->dst; 283 284 memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst)); 285 rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers); 286 rt->rt6i_genid = rt_genid_ipv6(net); 287 INIT_LIST_HEAD(&rt->rt6i_siblings); 288 } 289 return rt; 290 } 291 292 static void ip6_dst_destroy(struct dst_entry *dst) 293 { 294 struct rt6_info *rt = (struct rt6_info *)dst; 295 struct inet6_dev *idev = rt->rt6i_idev; 296 struct dst_entry *from = dst->from; 297 298 if (!(rt->dst.flags & DST_HOST)) 299 dst_destroy_metrics_generic(dst); 300 301 if (idev) { 302 rt->rt6i_idev = NULL; 303 in6_dev_put(idev); 304 } 305 306 dst->from = NULL; 307 dst_release(from); 308 309 if (rt6_has_peer(rt)) { 310 struct inet_peer *peer = rt6_peer_ptr(rt); 311 inet_putpeer(peer); 312 } 313 } 314 315 void rt6_bind_peer(struct rt6_info *rt, int create) 316 { 317 struct inet_peer_base *base; 318 struct inet_peer *peer; 319 320 base = inetpeer_base_ptr(rt->_rt6i_peer); 321 if (!base) 322 return; 323 324 peer = inet_getpeer_v6(base, &rt->rt6i_dst.addr, create); 325 if (peer) { 326 if (!rt6_set_peer(rt, peer)) 327 inet_putpeer(peer); 328 } 329 } 330 331 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, 332 int how) 333 { 334 struct rt6_info *rt = (struct rt6_info *)dst; 335 struct inet6_dev *idev = rt->rt6i_idev; 336 struct net_device *loopback_dev = 337 dev_net(dev)->loopback_dev; 338 339 if (dev != loopback_dev) { 340 if (idev && idev->dev == dev) { 341 struct inet6_dev *loopback_idev = 342 in6_dev_get(loopback_dev); 343 if (loopback_idev) { 344 rt->rt6i_idev = loopback_idev; 345 in6_dev_put(idev); 346 } 347 } 348 } 349 } 350 351 static bool rt6_check_expired(const struct rt6_info *rt) 352 { 353 if (rt->rt6i_flags & RTF_EXPIRES) { 354 if (time_after(jiffies, rt->dst.expires)) 355 return true; 356 } else if (rt->dst.from) { 357 return rt6_check_expired((struct rt6_info *) rt->dst.from); 358 } 359 return false; 360 } 361 362 static bool rt6_need_strict(const struct in6_addr *daddr) 363 { 364 return ipv6_addr_type(daddr) & 365 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 366 } 367 368 /* Multipath route selection: 369 * Hash based function using packet header and flowlabel. 370 * Adapted from fib_info_hashfn() 371 */ 372 static int rt6_info_hash_nhsfn(unsigned int candidate_count, 373 const struct flowi6 *fl6) 374 { 375 unsigned int val = fl6->flowi6_proto; 376 377 val ^= ipv6_addr_hash(&fl6->daddr); 378 val ^= ipv6_addr_hash(&fl6->saddr); 379 380 /* Work only if this not encapsulated */ 381 switch (fl6->flowi6_proto) { 382 case IPPROTO_UDP: 383 case IPPROTO_TCP: 384 case IPPROTO_SCTP: 385 val ^= (__force u16)fl6->fl6_sport; 386 val ^= (__force u16)fl6->fl6_dport; 387 break; 388 389 case IPPROTO_ICMPV6: 390 val ^= (__force u16)fl6->fl6_icmp_type; 391 val ^= (__force u16)fl6->fl6_icmp_code; 392 break; 393 } 394 /* RFC6438 recommands to use flowlabel */ 395 val ^= (__force u32)fl6->flowlabel; 396 397 /* Perhaps, we need to tune, this function? */ 398 val = val ^ (val >> 7) ^ (val >> 12); 399 return val % candidate_count; 400 } 401 402 static struct rt6_info *rt6_multipath_select(struct rt6_info *match, 403 struct flowi6 *fl6, int oif, 404 int strict) 405 { 406 struct rt6_info *sibling, *next_sibling; 407 int route_choosen; 408 409 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); 410 /* Don't change the route, if route_choosen == 0 411 * (siblings does not include ourself) 412 */ 413 if (route_choosen) 414 list_for_each_entry_safe(sibling, next_sibling, 415 &match->rt6i_siblings, rt6i_siblings) { 416 route_choosen--; 417 if (route_choosen == 0) { 418 if (rt6_score_route(sibling, oif, strict) < 0) 419 break; 420 match = sibling; 421 break; 422 } 423 } 424 return match; 425 } 426 427 /* 428 * Route lookup. Any table->tb6_lock is implied. 429 */ 430 431 static inline struct rt6_info *rt6_device_match(struct net *net, 432 struct rt6_info *rt, 433 const struct in6_addr *saddr, 434 int oif, 435 int flags) 436 { 437 struct rt6_info *local = NULL; 438 struct rt6_info *sprt; 439 440 if (!oif && ipv6_addr_any(saddr)) 441 goto out; 442 443 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { 444 struct net_device *dev = sprt->dst.dev; 445 446 if (oif) { 447 if (dev->ifindex == oif) 448 return sprt; 449 if (dev->flags & IFF_LOOPBACK) { 450 if (!sprt->rt6i_idev || 451 sprt->rt6i_idev->dev->ifindex != oif) { 452 if (flags & RT6_LOOKUP_F_IFACE && oif) 453 continue; 454 if (local && (!oif || 455 local->rt6i_idev->dev->ifindex == oif)) 456 continue; 457 } 458 local = sprt; 459 } 460 } else { 461 if (ipv6_chk_addr(net, saddr, dev, 462 flags & RT6_LOOKUP_F_IFACE)) 463 return sprt; 464 } 465 } 466 467 if (oif) { 468 if (local) 469 return local; 470 471 if (flags & RT6_LOOKUP_F_IFACE) 472 return net->ipv6.ip6_null_entry; 473 } 474 out: 475 return rt; 476 } 477 478 #ifdef CONFIG_IPV6_ROUTER_PREF 479 struct __rt6_probe_work { 480 struct work_struct work; 481 struct in6_addr target; 482 struct net_device *dev; 483 }; 484 485 static void rt6_probe_deferred(struct work_struct *w) 486 { 487 struct in6_addr mcaddr; 488 struct __rt6_probe_work *work = 489 container_of(w, struct __rt6_probe_work, work); 490 491 addrconf_addr_solict_mult(&work->target, &mcaddr); 492 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); 493 dev_put(work->dev); 494 kfree(w); 495 } 496 497 static void rt6_probe(struct rt6_info *rt) 498 { 499 struct neighbour *neigh; 500 /* 501 * Okay, this does not seem to be appropriate 502 * for now, however, we need to check if it 503 * is really so; aka Router Reachability Probing. 504 * 505 * Router Reachability Probe MUST be rate-limited 506 * to no more than one per minute. 507 */ 508 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) 509 return; 510 rcu_read_lock_bh(); 511 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 512 if (neigh) { 513 write_lock(&neigh->lock); 514 if (neigh->nud_state & NUD_VALID) 515 goto out; 516 } 517 518 if (!neigh || 519 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { 520 struct __rt6_probe_work *work; 521 522 work = kmalloc(sizeof(*work), GFP_ATOMIC); 523 524 if (neigh && work) 525 neigh->updated = jiffies; 526 527 if (neigh) 528 write_unlock(&neigh->lock); 529 530 if (work) { 531 INIT_WORK(&work->work, rt6_probe_deferred); 532 work->target = rt->rt6i_gateway; 533 dev_hold(rt->dst.dev); 534 work->dev = rt->dst.dev; 535 schedule_work(&work->work); 536 } 537 } else { 538 out: 539 write_unlock(&neigh->lock); 540 } 541 rcu_read_unlock_bh(); 542 } 543 #else 544 static inline void rt6_probe(struct rt6_info *rt) 545 { 546 } 547 #endif 548 549 /* 550 * Default Router Selection (RFC 2461 6.3.6) 551 */ 552 static inline int rt6_check_dev(struct rt6_info *rt, int oif) 553 { 554 struct net_device *dev = rt->dst.dev; 555 if (!oif || dev->ifindex == oif) 556 return 2; 557 if ((dev->flags & IFF_LOOPBACK) && 558 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) 559 return 1; 560 return 0; 561 } 562 563 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) 564 { 565 struct neighbour *neigh; 566 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; 567 568 if (rt->rt6i_flags & RTF_NONEXTHOP || 569 !(rt->rt6i_flags & RTF_GATEWAY)) 570 return RT6_NUD_SUCCEED; 571 572 rcu_read_lock_bh(); 573 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 574 if (neigh) { 575 read_lock(&neigh->lock); 576 if (neigh->nud_state & NUD_VALID) 577 ret = RT6_NUD_SUCCEED; 578 #ifdef CONFIG_IPV6_ROUTER_PREF 579 else if (!(neigh->nud_state & NUD_FAILED)) 580 ret = RT6_NUD_SUCCEED; 581 #endif 582 read_unlock(&neigh->lock); 583 } else { 584 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? 585 RT6_NUD_SUCCEED : RT6_NUD_FAIL_SOFT; 586 } 587 rcu_read_unlock_bh(); 588 589 return ret; 590 } 591 592 static int rt6_score_route(struct rt6_info *rt, int oif, 593 int strict) 594 { 595 int m; 596 597 m = rt6_check_dev(rt, oif); 598 if (!m && (strict & RT6_LOOKUP_F_IFACE)) 599 return RT6_NUD_FAIL_HARD; 600 #ifdef CONFIG_IPV6_ROUTER_PREF 601 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; 602 #endif 603 if (strict & RT6_LOOKUP_F_REACHABLE) { 604 int n = rt6_check_neigh(rt); 605 if (n < 0) 606 return n; 607 } 608 return m; 609 } 610 611 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, 612 int *mpri, struct rt6_info *match, 613 bool *do_rr) 614 { 615 int m; 616 bool match_do_rr = false; 617 618 if (rt6_check_expired(rt)) 619 goto out; 620 621 m = rt6_score_route(rt, oif, strict); 622 if (m == RT6_NUD_FAIL_SOFT && !IS_ENABLED(CONFIG_IPV6_ROUTER_PREF)) { 623 match_do_rr = true; 624 m = 0; /* lowest valid score */ 625 } else if (m < 0) { 626 goto out; 627 } 628 629 if (strict & RT6_LOOKUP_F_REACHABLE) 630 rt6_probe(rt); 631 632 if (m > *mpri) { 633 *do_rr = match_do_rr; 634 *mpri = m; 635 match = rt; 636 } 637 out: 638 return match; 639 } 640 641 static struct rt6_info *find_rr_leaf(struct fib6_node *fn, 642 struct rt6_info *rr_head, 643 u32 metric, int oif, int strict, 644 bool *do_rr) 645 { 646 struct rt6_info *rt, *match; 647 int mpri = -1; 648 649 match = NULL; 650 for (rt = rr_head; rt && rt->rt6i_metric == metric; 651 rt = rt->dst.rt6_next) 652 match = find_match(rt, oif, strict, &mpri, match, do_rr); 653 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; 654 rt = rt->dst.rt6_next) 655 match = find_match(rt, oif, strict, &mpri, match, do_rr); 656 657 return match; 658 } 659 660 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) 661 { 662 struct rt6_info *match, *rt0; 663 struct net *net; 664 bool do_rr = false; 665 666 rt0 = fn->rr_ptr; 667 if (!rt0) 668 fn->rr_ptr = rt0 = fn->leaf; 669 670 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, 671 &do_rr); 672 673 if (do_rr) { 674 struct rt6_info *next = rt0->dst.rt6_next; 675 676 /* no entries matched; do round-robin */ 677 if (!next || next->rt6i_metric != rt0->rt6i_metric) 678 next = fn->leaf; 679 680 if (next != rt0) 681 fn->rr_ptr = next; 682 } 683 684 net = dev_net(rt0->dst.dev); 685 return match ? match : net->ipv6.ip6_null_entry; 686 } 687 688 #ifdef CONFIG_IPV6_ROUTE_INFO 689 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 690 const struct in6_addr *gwaddr) 691 { 692 struct net *net = dev_net(dev); 693 struct route_info *rinfo = (struct route_info *) opt; 694 struct in6_addr prefix_buf, *prefix; 695 unsigned int pref; 696 unsigned long lifetime; 697 struct rt6_info *rt; 698 699 if (len < sizeof(struct route_info)) { 700 return -EINVAL; 701 } 702 703 /* Sanity check for prefix_len and length */ 704 if (rinfo->length > 3) { 705 return -EINVAL; 706 } else if (rinfo->prefix_len > 128) { 707 return -EINVAL; 708 } else if (rinfo->prefix_len > 64) { 709 if (rinfo->length < 2) { 710 return -EINVAL; 711 } 712 } else if (rinfo->prefix_len > 0) { 713 if (rinfo->length < 1) { 714 return -EINVAL; 715 } 716 } 717 718 pref = rinfo->route_pref; 719 if (pref == ICMPV6_ROUTER_PREF_INVALID) 720 return -EINVAL; 721 722 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); 723 724 if (rinfo->length == 3) 725 prefix = (struct in6_addr *)rinfo->prefix; 726 else { 727 /* this function is safe */ 728 ipv6_addr_prefix(&prefix_buf, 729 (struct in6_addr *)rinfo->prefix, 730 rinfo->prefix_len); 731 prefix = &prefix_buf; 732 } 733 734 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, 735 dev->ifindex); 736 737 if (rt && !lifetime) { 738 ip6_del_rt(rt); 739 rt = NULL; 740 } 741 742 if (!rt && lifetime) 743 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, 744 pref); 745 else if (rt) 746 rt->rt6i_flags = RTF_ROUTEINFO | 747 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); 748 749 if (rt) { 750 if (!addrconf_finite_timeout(lifetime)) 751 rt6_clean_expires(rt); 752 else 753 rt6_set_expires(rt, jiffies + HZ * lifetime); 754 755 ip6_rt_put(rt); 756 } 757 return 0; 758 } 759 #endif 760 761 #define BACKTRACK(__net, saddr) \ 762 do { \ 763 if (rt == __net->ipv6.ip6_null_entry) { \ 764 struct fib6_node *pn; \ 765 while (1) { \ 766 if (fn->fn_flags & RTN_TL_ROOT) \ 767 goto out; \ 768 pn = fn->parent; \ 769 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ 770 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ 771 else \ 772 fn = pn; \ 773 if (fn->fn_flags & RTN_RTINFO) \ 774 goto restart; \ 775 } \ 776 } \ 777 } while (0) 778 779 static struct rt6_info *ip6_pol_route_lookup(struct net *net, 780 struct fib6_table *table, 781 struct flowi6 *fl6, int flags) 782 { 783 struct fib6_node *fn; 784 struct rt6_info *rt; 785 786 read_lock_bh(&table->tb6_lock); 787 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 788 restart: 789 rt = fn->leaf; 790 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); 791 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) 792 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); 793 BACKTRACK(net, &fl6->saddr); 794 out: 795 dst_use(&rt->dst, jiffies); 796 read_unlock_bh(&table->tb6_lock); 797 return rt; 798 799 } 800 801 struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, 802 int flags) 803 { 804 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); 805 } 806 EXPORT_SYMBOL_GPL(ip6_route_lookup); 807 808 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 809 const struct in6_addr *saddr, int oif, int strict) 810 { 811 struct flowi6 fl6 = { 812 .flowi6_oif = oif, 813 .daddr = *daddr, 814 }; 815 struct dst_entry *dst; 816 int flags = strict ? RT6_LOOKUP_F_IFACE : 0; 817 818 if (saddr) { 819 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 820 flags |= RT6_LOOKUP_F_HAS_SADDR; 821 } 822 823 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); 824 if (dst->error == 0) 825 return (struct rt6_info *) dst; 826 827 dst_release(dst); 828 829 return NULL; 830 } 831 832 EXPORT_SYMBOL(rt6_lookup); 833 834 /* ip6_ins_rt is called with FREE table->tb6_lock. 835 It takes new route entry, the addition fails by any reason the 836 route is freed. In any case, if caller does not hold it, it may 837 be destroyed. 838 */ 839 840 static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) 841 { 842 int err; 843 struct fib6_table *table; 844 845 table = rt->rt6i_table; 846 write_lock_bh(&table->tb6_lock); 847 err = fib6_add(&table->tb6_root, rt, info); 848 write_unlock_bh(&table->tb6_lock); 849 850 return err; 851 } 852 853 int ip6_ins_rt(struct rt6_info *rt) 854 { 855 struct nl_info info = { 856 .nl_net = dev_net(rt->dst.dev), 857 }; 858 return __ip6_ins_rt(rt, &info); 859 } 860 861 static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, 862 const struct in6_addr *daddr, 863 const struct in6_addr *saddr) 864 { 865 struct rt6_info *rt; 866 867 /* 868 * Clone the route. 869 */ 870 871 rt = ip6_rt_copy(ort, daddr); 872 873 if (rt) { 874 if (!(rt->rt6i_flags & RTF_GATEWAY)) { 875 if (ort->rt6i_dst.plen != 128 && 876 ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) 877 rt->rt6i_flags |= RTF_ANYCAST; 878 } 879 880 rt->rt6i_flags |= RTF_CACHE; 881 882 #ifdef CONFIG_IPV6_SUBTREES 883 if (rt->rt6i_src.plen && saddr) { 884 rt->rt6i_src.addr = *saddr; 885 rt->rt6i_src.plen = 128; 886 } 887 #endif 888 } 889 890 return rt; 891 } 892 893 static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, 894 const struct in6_addr *daddr) 895 { 896 struct rt6_info *rt = ip6_rt_copy(ort, daddr); 897 898 if (rt) 899 rt->rt6i_flags |= RTF_CACHE; 900 return rt; 901 } 902 903 static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, 904 struct flowi6 *fl6, int flags) 905 { 906 struct fib6_node *fn; 907 struct rt6_info *rt, *nrt; 908 int strict = 0; 909 int attempts = 3; 910 int err; 911 int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; 912 913 strict |= flags & RT6_LOOKUP_F_IFACE; 914 915 relookup: 916 read_lock_bh(&table->tb6_lock); 917 918 restart_2: 919 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 920 921 restart: 922 rt = rt6_select(fn, oif, strict | reachable); 923 if (rt->rt6i_nsiblings) 924 rt = rt6_multipath_select(rt, fl6, oif, strict | reachable); 925 BACKTRACK(net, &fl6->saddr); 926 if (rt == net->ipv6.ip6_null_entry || 927 rt->rt6i_flags & RTF_CACHE) 928 goto out; 929 930 dst_hold(&rt->dst); 931 read_unlock_bh(&table->tb6_lock); 932 933 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) 934 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); 935 else if (!(rt->dst.flags & DST_HOST)) 936 nrt = rt6_alloc_clone(rt, &fl6->daddr); 937 else 938 goto out2; 939 940 ip6_rt_put(rt); 941 rt = nrt ? : net->ipv6.ip6_null_entry; 942 943 dst_hold(&rt->dst); 944 if (nrt) { 945 err = ip6_ins_rt(nrt); 946 if (!err) 947 goto out2; 948 } 949 950 if (--attempts <= 0) 951 goto out2; 952 953 /* 954 * Race condition! In the gap, when table->tb6_lock was 955 * released someone could insert this route. Relookup. 956 */ 957 ip6_rt_put(rt); 958 goto relookup; 959 960 out: 961 if (reachable) { 962 reachable = 0; 963 goto restart_2; 964 } 965 dst_hold(&rt->dst); 966 read_unlock_bh(&table->tb6_lock); 967 out2: 968 rt->dst.lastuse = jiffies; 969 rt->dst.__use++; 970 971 return rt; 972 } 973 974 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, 975 struct flowi6 *fl6, int flags) 976 { 977 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); 978 } 979 980 static struct dst_entry *ip6_route_input_lookup(struct net *net, 981 struct net_device *dev, 982 struct flowi6 *fl6, int flags) 983 { 984 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) 985 flags |= RT6_LOOKUP_F_IFACE; 986 987 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); 988 } 989 990 void ip6_route_input(struct sk_buff *skb) 991 { 992 const struct ipv6hdr *iph = ipv6_hdr(skb); 993 struct net *net = dev_net(skb->dev); 994 int flags = RT6_LOOKUP_F_HAS_SADDR; 995 struct flowi6 fl6 = { 996 .flowi6_iif = skb->dev->ifindex, 997 .daddr = iph->daddr, 998 .saddr = iph->saddr, 999 .flowlabel = ip6_flowinfo(iph), 1000 .flowi6_mark = skb->mark, 1001 .flowi6_proto = iph->nexthdr, 1002 }; 1003 1004 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); 1005 } 1006 1007 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, 1008 struct flowi6 *fl6, int flags) 1009 { 1010 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); 1011 } 1012 1013 struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, 1014 struct flowi6 *fl6) 1015 { 1016 int flags = 0; 1017 1018 fl6->flowi6_iif = LOOPBACK_IFINDEX; 1019 1020 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) 1021 flags |= RT6_LOOKUP_F_IFACE; 1022 1023 if (!ipv6_addr_any(&fl6->saddr)) 1024 flags |= RT6_LOOKUP_F_HAS_SADDR; 1025 else if (sk) 1026 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); 1027 1028 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); 1029 } 1030 1031 EXPORT_SYMBOL(ip6_route_output); 1032 1033 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) 1034 { 1035 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; 1036 struct dst_entry *new = NULL; 1037 1038 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); 1039 if (rt) { 1040 new = &rt->dst; 1041 1042 memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); 1043 rt6_init_peer(rt, net->ipv6.peers); 1044 1045 new->__use = 1; 1046 new->input = dst_discard; 1047 new->output = dst_discard; 1048 1049 if (dst_metrics_read_only(&ort->dst)) 1050 new->_metrics = ort->dst._metrics; 1051 else 1052 dst_copy_metrics(new, &ort->dst); 1053 rt->rt6i_idev = ort->rt6i_idev; 1054 if (rt->rt6i_idev) 1055 in6_dev_hold(rt->rt6i_idev); 1056 1057 rt->rt6i_gateway = ort->rt6i_gateway; 1058 rt->rt6i_flags = ort->rt6i_flags; 1059 rt->rt6i_metric = 0; 1060 1061 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); 1062 #ifdef CONFIG_IPV6_SUBTREES 1063 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1064 #endif 1065 1066 dst_free(new); 1067 } 1068 1069 dst_release(dst_orig); 1070 return new ? new : ERR_PTR(-ENOMEM); 1071 } 1072 1073 /* 1074 * Destination cache support functions 1075 */ 1076 1077 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) 1078 { 1079 struct rt6_info *rt; 1080 1081 rt = (struct rt6_info *) dst; 1082 1083 /* All IPV6 dsts are created with ->obsolete set to the value 1084 * DST_OBSOLETE_FORCE_CHK which forces validation calls down 1085 * into this function always. 1086 */ 1087 if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev))) 1088 return NULL; 1089 1090 if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) 1091 return dst; 1092 1093 return NULL; 1094 } 1095 1096 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) 1097 { 1098 struct rt6_info *rt = (struct rt6_info *) dst; 1099 1100 if (rt) { 1101 if (rt->rt6i_flags & RTF_CACHE) { 1102 if (rt6_check_expired(rt)) { 1103 ip6_del_rt(rt); 1104 dst = NULL; 1105 } 1106 } else { 1107 dst_release(dst); 1108 dst = NULL; 1109 } 1110 } 1111 return dst; 1112 } 1113 1114 static void ip6_link_failure(struct sk_buff *skb) 1115 { 1116 struct rt6_info *rt; 1117 1118 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); 1119 1120 rt = (struct rt6_info *) skb_dst(skb); 1121 if (rt) { 1122 if (rt->rt6i_flags & RTF_CACHE) { 1123 dst_hold(&rt->dst); 1124 if (ip6_del_rt(rt)) 1125 dst_free(&rt->dst); 1126 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { 1127 rt->rt6i_node->fn_sernum = -1; 1128 } 1129 } 1130 } 1131 1132 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, 1133 struct sk_buff *skb, u32 mtu) 1134 { 1135 struct rt6_info *rt6 = (struct rt6_info*)dst; 1136 1137 dst_confirm(dst); 1138 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { 1139 struct net *net = dev_net(dst->dev); 1140 1141 rt6->rt6i_flags |= RTF_MODIFIED; 1142 if (mtu < IPV6_MIN_MTU) { 1143 u32 features = dst_metric(dst, RTAX_FEATURES); 1144 mtu = IPV6_MIN_MTU; 1145 features |= RTAX_FEATURE_ALLFRAG; 1146 dst_metric_set(dst, RTAX_FEATURES, features); 1147 } 1148 dst_metric_set(dst, RTAX_MTU, mtu); 1149 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); 1150 } 1151 } 1152 1153 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, 1154 int oif, u32 mark) 1155 { 1156 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1157 struct dst_entry *dst; 1158 struct flowi6 fl6; 1159 1160 memset(&fl6, 0, sizeof(fl6)); 1161 fl6.flowi6_oif = oif; 1162 fl6.flowi6_mark = mark; 1163 fl6.flowi6_flags = 0; 1164 fl6.daddr = iph->daddr; 1165 fl6.saddr = iph->saddr; 1166 fl6.flowlabel = ip6_flowinfo(iph); 1167 1168 dst = ip6_route_output(net, NULL, &fl6); 1169 if (!dst->error) 1170 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); 1171 dst_release(dst); 1172 } 1173 EXPORT_SYMBOL_GPL(ip6_update_pmtu); 1174 1175 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) 1176 { 1177 ip6_update_pmtu(skb, sock_net(sk), mtu, 1178 sk->sk_bound_dev_if, sk->sk_mark); 1179 } 1180 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); 1181 1182 /* Handle redirects */ 1183 struct ip6rd_flowi { 1184 struct flowi6 fl6; 1185 struct in6_addr gateway; 1186 }; 1187 1188 static struct rt6_info *__ip6_route_redirect(struct net *net, 1189 struct fib6_table *table, 1190 struct flowi6 *fl6, 1191 int flags) 1192 { 1193 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; 1194 struct rt6_info *rt; 1195 struct fib6_node *fn; 1196 1197 /* Get the "current" route for this destination and 1198 * check if the redirect has come from approriate router. 1199 * 1200 * RFC 4861 specifies that redirects should only be 1201 * accepted if they come from the nexthop to the target. 1202 * Due to the way the routes are chosen, this notion 1203 * is a bit fuzzy and one might need to check all possible 1204 * routes. 1205 */ 1206 1207 read_lock_bh(&table->tb6_lock); 1208 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 1209 restart: 1210 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1211 if (rt6_check_expired(rt)) 1212 continue; 1213 if (rt->dst.error) 1214 break; 1215 if (!(rt->rt6i_flags & RTF_GATEWAY)) 1216 continue; 1217 if (fl6->flowi6_oif != rt->dst.dev->ifindex) 1218 continue; 1219 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) 1220 continue; 1221 break; 1222 } 1223 1224 if (!rt) 1225 rt = net->ipv6.ip6_null_entry; 1226 else if (rt->dst.error) { 1227 rt = net->ipv6.ip6_null_entry; 1228 goto out; 1229 } 1230 BACKTRACK(net, &fl6->saddr); 1231 out: 1232 dst_hold(&rt->dst); 1233 1234 read_unlock_bh(&table->tb6_lock); 1235 1236 return rt; 1237 }; 1238 1239 static struct dst_entry *ip6_route_redirect(struct net *net, 1240 const struct flowi6 *fl6, 1241 const struct in6_addr *gateway) 1242 { 1243 int flags = RT6_LOOKUP_F_HAS_SADDR; 1244 struct ip6rd_flowi rdfl; 1245 1246 rdfl.fl6 = *fl6; 1247 rdfl.gateway = *gateway; 1248 1249 return fib6_rule_lookup(net, &rdfl.fl6, 1250 flags, __ip6_route_redirect); 1251 } 1252 1253 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) 1254 { 1255 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1256 struct dst_entry *dst; 1257 struct flowi6 fl6; 1258 1259 memset(&fl6, 0, sizeof(fl6)); 1260 fl6.flowi6_oif = oif; 1261 fl6.flowi6_mark = mark; 1262 fl6.flowi6_flags = 0; 1263 fl6.daddr = iph->daddr; 1264 fl6.saddr = iph->saddr; 1265 fl6.flowlabel = ip6_flowinfo(iph); 1266 1267 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); 1268 rt6_do_redirect(dst, NULL, skb); 1269 dst_release(dst); 1270 } 1271 EXPORT_SYMBOL_GPL(ip6_redirect); 1272 1273 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 1274 u32 mark) 1275 { 1276 const struct ipv6hdr *iph = ipv6_hdr(skb); 1277 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); 1278 struct dst_entry *dst; 1279 struct flowi6 fl6; 1280 1281 memset(&fl6, 0, sizeof(fl6)); 1282 fl6.flowi6_oif = oif; 1283 fl6.flowi6_mark = mark; 1284 fl6.flowi6_flags = 0; 1285 fl6.daddr = msg->dest; 1286 fl6.saddr = iph->daddr; 1287 1288 dst = ip6_route_redirect(net, &fl6, &iph->saddr); 1289 rt6_do_redirect(dst, NULL, skb); 1290 dst_release(dst); 1291 } 1292 1293 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) 1294 { 1295 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); 1296 } 1297 EXPORT_SYMBOL_GPL(ip6_sk_redirect); 1298 1299 static unsigned int ip6_default_advmss(const struct dst_entry *dst) 1300 { 1301 struct net_device *dev = dst->dev; 1302 unsigned int mtu = dst_mtu(dst); 1303 struct net *net = dev_net(dev); 1304 1305 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); 1306 1307 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) 1308 mtu = net->ipv6.sysctl.ip6_rt_min_advmss; 1309 1310 /* 1311 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and 1312 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. 1313 * IPV6_MAXPLEN is also valid and means: "any MSS, 1314 * rely only on pmtu discovery" 1315 */ 1316 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) 1317 mtu = IPV6_MAXPLEN; 1318 return mtu; 1319 } 1320 1321 static unsigned int ip6_mtu(const struct dst_entry *dst) 1322 { 1323 struct inet6_dev *idev; 1324 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); 1325 1326 if (mtu) 1327 return mtu; 1328 1329 mtu = IPV6_MIN_MTU; 1330 1331 rcu_read_lock(); 1332 idev = __in6_dev_get(dst->dev); 1333 if (idev) 1334 mtu = idev->cnf.mtu6; 1335 rcu_read_unlock(); 1336 1337 return mtu; 1338 } 1339 1340 static struct dst_entry *icmp6_dst_gc_list; 1341 static DEFINE_SPINLOCK(icmp6_dst_lock); 1342 1343 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 1344 struct flowi6 *fl6) 1345 { 1346 struct dst_entry *dst; 1347 struct rt6_info *rt; 1348 struct inet6_dev *idev = in6_dev_get(dev); 1349 struct net *net = dev_net(dev); 1350 1351 if (unlikely(!idev)) 1352 return ERR_PTR(-ENODEV); 1353 1354 rt = ip6_dst_alloc(net, dev, 0, NULL); 1355 if (unlikely(!rt)) { 1356 in6_dev_put(idev); 1357 dst = ERR_PTR(-ENOMEM); 1358 goto out; 1359 } 1360 1361 rt->dst.flags |= DST_HOST; 1362 rt->dst.output = ip6_output; 1363 atomic_set(&rt->dst.__refcnt, 1); 1364 rt->rt6i_gateway = fl6->daddr; 1365 rt->rt6i_dst.addr = fl6->daddr; 1366 rt->rt6i_dst.plen = 128; 1367 rt->rt6i_idev = idev; 1368 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); 1369 1370 spin_lock_bh(&icmp6_dst_lock); 1371 rt->dst.next = icmp6_dst_gc_list; 1372 icmp6_dst_gc_list = &rt->dst; 1373 spin_unlock_bh(&icmp6_dst_lock); 1374 1375 fib6_force_start_gc(net); 1376 1377 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); 1378 1379 out: 1380 return dst; 1381 } 1382 1383 int icmp6_dst_gc(void) 1384 { 1385 struct dst_entry *dst, **pprev; 1386 int more = 0; 1387 1388 spin_lock_bh(&icmp6_dst_lock); 1389 pprev = &icmp6_dst_gc_list; 1390 1391 while ((dst = *pprev) != NULL) { 1392 if (!atomic_read(&dst->__refcnt)) { 1393 *pprev = dst->next; 1394 dst_free(dst); 1395 } else { 1396 pprev = &dst->next; 1397 ++more; 1398 } 1399 } 1400 1401 spin_unlock_bh(&icmp6_dst_lock); 1402 1403 return more; 1404 } 1405 1406 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), 1407 void *arg) 1408 { 1409 struct dst_entry *dst, **pprev; 1410 1411 spin_lock_bh(&icmp6_dst_lock); 1412 pprev = &icmp6_dst_gc_list; 1413 while ((dst = *pprev) != NULL) { 1414 struct rt6_info *rt = (struct rt6_info *) dst; 1415 if (func(rt, arg)) { 1416 *pprev = dst->next; 1417 dst_free(dst); 1418 } else { 1419 pprev = &dst->next; 1420 } 1421 } 1422 spin_unlock_bh(&icmp6_dst_lock); 1423 } 1424 1425 static int ip6_dst_gc(struct dst_ops *ops) 1426 { 1427 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); 1428 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; 1429 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; 1430 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; 1431 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; 1432 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; 1433 int entries; 1434 1435 entries = dst_entries_get_fast(ops); 1436 if (time_after(rt_last_gc + rt_min_interval, jiffies) && 1437 entries <= rt_max_size) 1438 goto out; 1439 1440 net->ipv6.ip6_rt_gc_expire++; 1441 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, entries > rt_max_size); 1442 entries = dst_entries_get_slow(ops); 1443 if (entries < ops->gc_thresh) 1444 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; 1445 out: 1446 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; 1447 return entries > rt_max_size; 1448 } 1449 1450 /* 1451 * 1452 */ 1453 1454 int ip6_route_add(struct fib6_config *cfg) 1455 { 1456 int err; 1457 struct net *net = cfg->fc_nlinfo.nl_net; 1458 struct rt6_info *rt = NULL; 1459 struct net_device *dev = NULL; 1460 struct inet6_dev *idev = NULL; 1461 struct fib6_table *table; 1462 int addr_type; 1463 1464 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) 1465 return -EINVAL; 1466 #ifndef CONFIG_IPV6_SUBTREES 1467 if (cfg->fc_src_len) 1468 return -EINVAL; 1469 #endif 1470 if (cfg->fc_ifindex) { 1471 err = -ENODEV; 1472 dev = dev_get_by_index(net, cfg->fc_ifindex); 1473 if (!dev) 1474 goto out; 1475 idev = in6_dev_get(dev); 1476 if (!idev) 1477 goto out; 1478 } 1479 1480 if (cfg->fc_metric == 0) 1481 cfg->fc_metric = IP6_RT_PRIO_USER; 1482 1483 err = -ENOBUFS; 1484 if (cfg->fc_nlinfo.nlh && 1485 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { 1486 table = fib6_get_table(net, cfg->fc_table); 1487 if (!table) { 1488 pr_warn("NLM_F_CREATE should be specified when creating new route\n"); 1489 table = fib6_new_table(net, cfg->fc_table); 1490 } 1491 } else { 1492 table = fib6_new_table(net, cfg->fc_table); 1493 } 1494 1495 if (!table) 1496 goto out; 1497 1498 rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table); 1499 1500 if (!rt) { 1501 err = -ENOMEM; 1502 goto out; 1503 } 1504 1505 if (cfg->fc_flags & RTF_EXPIRES) 1506 rt6_set_expires(rt, jiffies + 1507 clock_t_to_jiffies(cfg->fc_expires)); 1508 else 1509 rt6_clean_expires(rt); 1510 1511 if (cfg->fc_protocol == RTPROT_UNSPEC) 1512 cfg->fc_protocol = RTPROT_BOOT; 1513 rt->rt6i_protocol = cfg->fc_protocol; 1514 1515 addr_type = ipv6_addr_type(&cfg->fc_dst); 1516 1517 if (addr_type & IPV6_ADDR_MULTICAST) 1518 rt->dst.input = ip6_mc_input; 1519 else if (cfg->fc_flags & RTF_LOCAL) 1520 rt->dst.input = ip6_input; 1521 else 1522 rt->dst.input = ip6_forward; 1523 1524 rt->dst.output = ip6_output; 1525 1526 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); 1527 rt->rt6i_dst.plen = cfg->fc_dst_len; 1528 if (rt->rt6i_dst.plen == 128) 1529 rt->dst.flags |= DST_HOST; 1530 1531 if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { 1532 u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); 1533 if (!metrics) { 1534 err = -ENOMEM; 1535 goto out; 1536 } 1537 dst_init_metrics(&rt->dst, metrics, 0); 1538 } 1539 #ifdef CONFIG_IPV6_SUBTREES 1540 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); 1541 rt->rt6i_src.plen = cfg->fc_src_len; 1542 #endif 1543 1544 rt->rt6i_metric = cfg->fc_metric; 1545 1546 /* We cannot add true routes via loopback here, 1547 they would result in kernel looping; promote them to reject routes 1548 */ 1549 if ((cfg->fc_flags & RTF_REJECT) || 1550 (dev && (dev->flags & IFF_LOOPBACK) && 1551 !(addr_type & IPV6_ADDR_LOOPBACK) && 1552 !(cfg->fc_flags & RTF_LOCAL))) { 1553 /* hold loopback dev/idev if we haven't done so. */ 1554 if (dev != net->loopback_dev) { 1555 if (dev) { 1556 dev_put(dev); 1557 in6_dev_put(idev); 1558 } 1559 dev = net->loopback_dev; 1560 dev_hold(dev); 1561 idev = in6_dev_get(dev); 1562 if (!idev) { 1563 err = -ENODEV; 1564 goto out; 1565 } 1566 } 1567 rt->dst.output = ip6_pkt_discard_out; 1568 rt->dst.input = ip6_pkt_discard; 1569 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; 1570 switch (cfg->fc_type) { 1571 case RTN_BLACKHOLE: 1572 rt->dst.error = -EINVAL; 1573 break; 1574 case RTN_PROHIBIT: 1575 rt->dst.error = -EACCES; 1576 break; 1577 case RTN_THROW: 1578 rt->dst.error = -EAGAIN; 1579 break; 1580 default: 1581 rt->dst.error = -ENETUNREACH; 1582 break; 1583 } 1584 goto install_route; 1585 } 1586 1587 if (cfg->fc_flags & RTF_GATEWAY) { 1588 const struct in6_addr *gw_addr; 1589 int gwa_type; 1590 1591 gw_addr = &cfg->fc_gateway; 1592 rt->rt6i_gateway = *gw_addr; 1593 gwa_type = ipv6_addr_type(gw_addr); 1594 1595 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { 1596 struct rt6_info *grt; 1597 1598 /* IPv6 strictly inhibits using not link-local 1599 addresses as nexthop address. 1600 Otherwise, router will not able to send redirects. 1601 It is very good, but in some (rare!) circumstances 1602 (SIT, PtP, NBMA NOARP links) it is handy to allow 1603 some exceptions. --ANK 1604 */ 1605 err = -EINVAL; 1606 if (!(gwa_type & IPV6_ADDR_UNICAST)) 1607 goto out; 1608 1609 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); 1610 1611 err = -EHOSTUNREACH; 1612 if (!grt) 1613 goto out; 1614 if (dev) { 1615 if (dev != grt->dst.dev) { 1616 ip6_rt_put(grt); 1617 goto out; 1618 } 1619 } else { 1620 dev = grt->dst.dev; 1621 idev = grt->rt6i_idev; 1622 dev_hold(dev); 1623 in6_dev_hold(grt->rt6i_idev); 1624 } 1625 if (!(grt->rt6i_flags & RTF_GATEWAY)) 1626 err = 0; 1627 ip6_rt_put(grt); 1628 1629 if (err) 1630 goto out; 1631 } 1632 err = -EINVAL; 1633 if (!dev || (dev->flags & IFF_LOOPBACK)) 1634 goto out; 1635 } 1636 1637 err = -ENODEV; 1638 if (!dev) 1639 goto out; 1640 1641 if (!ipv6_addr_any(&cfg->fc_prefsrc)) { 1642 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { 1643 err = -EINVAL; 1644 goto out; 1645 } 1646 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; 1647 rt->rt6i_prefsrc.plen = 128; 1648 } else 1649 rt->rt6i_prefsrc.plen = 0; 1650 1651 rt->rt6i_flags = cfg->fc_flags; 1652 1653 install_route: 1654 if (cfg->fc_mx) { 1655 struct nlattr *nla; 1656 int remaining; 1657 1658 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { 1659 int type = nla_type(nla); 1660 1661 if (type) { 1662 if (type > RTAX_MAX) { 1663 err = -EINVAL; 1664 goto out; 1665 } 1666 1667 dst_metric_set(&rt->dst, type, nla_get_u32(nla)); 1668 } 1669 } 1670 } 1671 1672 rt->dst.dev = dev; 1673 rt->rt6i_idev = idev; 1674 rt->rt6i_table = table; 1675 1676 cfg->fc_nlinfo.nl_net = dev_net(dev); 1677 1678 return __ip6_ins_rt(rt, &cfg->fc_nlinfo); 1679 1680 out: 1681 if (dev) 1682 dev_put(dev); 1683 if (idev) 1684 in6_dev_put(idev); 1685 if (rt) 1686 dst_free(&rt->dst); 1687 return err; 1688 } 1689 1690 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) 1691 { 1692 int err; 1693 struct fib6_table *table; 1694 struct net *net = dev_net(rt->dst.dev); 1695 1696 if (rt == net->ipv6.ip6_null_entry) { 1697 err = -ENOENT; 1698 goto out; 1699 } 1700 1701 table = rt->rt6i_table; 1702 write_lock_bh(&table->tb6_lock); 1703 err = fib6_del(rt, info); 1704 write_unlock_bh(&table->tb6_lock); 1705 1706 out: 1707 ip6_rt_put(rt); 1708 return err; 1709 } 1710 1711 int ip6_del_rt(struct rt6_info *rt) 1712 { 1713 struct nl_info info = { 1714 .nl_net = dev_net(rt->dst.dev), 1715 }; 1716 return __ip6_del_rt(rt, &info); 1717 } 1718 1719 static int ip6_route_del(struct fib6_config *cfg) 1720 { 1721 struct fib6_table *table; 1722 struct fib6_node *fn; 1723 struct rt6_info *rt; 1724 int err = -ESRCH; 1725 1726 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); 1727 if (!table) 1728 return err; 1729 1730 read_lock_bh(&table->tb6_lock); 1731 1732 fn = fib6_locate(&table->tb6_root, 1733 &cfg->fc_dst, cfg->fc_dst_len, 1734 &cfg->fc_src, cfg->fc_src_len); 1735 1736 if (fn) { 1737 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1738 if (cfg->fc_ifindex && 1739 (!rt->dst.dev || 1740 rt->dst.dev->ifindex != cfg->fc_ifindex)) 1741 continue; 1742 if (cfg->fc_flags & RTF_GATEWAY && 1743 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) 1744 continue; 1745 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) 1746 continue; 1747 dst_hold(&rt->dst); 1748 read_unlock_bh(&table->tb6_lock); 1749 1750 return __ip6_del_rt(rt, &cfg->fc_nlinfo); 1751 } 1752 } 1753 read_unlock_bh(&table->tb6_lock); 1754 1755 return err; 1756 } 1757 1758 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) 1759 { 1760 struct net *net = dev_net(skb->dev); 1761 struct netevent_redirect netevent; 1762 struct rt6_info *rt, *nrt = NULL; 1763 struct ndisc_options ndopts; 1764 struct inet6_dev *in6_dev; 1765 struct neighbour *neigh; 1766 struct rd_msg *msg; 1767 int optlen, on_link; 1768 u8 *lladdr; 1769 1770 optlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1771 optlen -= sizeof(*msg); 1772 1773 if (optlen < 0) { 1774 net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); 1775 return; 1776 } 1777 1778 msg = (struct rd_msg *)icmp6_hdr(skb); 1779 1780 if (ipv6_addr_is_multicast(&msg->dest)) { 1781 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); 1782 return; 1783 } 1784 1785 on_link = 0; 1786 if (ipv6_addr_equal(&msg->dest, &msg->target)) { 1787 on_link = 1; 1788 } else if (ipv6_addr_type(&msg->target) != 1789 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { 1790 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); 1791 return; 1792 } 1793 1794 in6_dev = __in6_dev_get(skb->dev); 1795 if (!in6_dev) 1796 return; 1797 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) 1798 return; 1799 1800 /* RFC2461 8.1: 1801 * The IP source address of the Redirect MUST be the same as the current 1802 * first-hop router for the specified ICMP Destination Address. 1803 */ 1804 1805 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { 1806 net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); 1807 return; 1808 } 1809 1810 lladdr = NULL; 1811 if (ndopts.nd_opts_tgt_lladdr) { 1812 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, 1813 skb->dev); 1814 if (!lladdr) { 1815 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); 1816 return; 1817 } 1818 } 1819 1820 rt = (struct rt6_info *) dst; 1821 if (rt == net->ipv6.ip6_null_entry) { 1822 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); 1823 return; 1824 } 1825 1826 /* Redirect received -> path was valid. 1827 * Look, redirects are sent only in response to data packets, 1828 * so that this nexthop apparently is reachable. --ANK 1829 */ 1830 dst_confirm(&rt->dst); 1831 1832 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); 1833 if (!neigh) 1834 return; 1835 1836 /* 1837 * We have finally decided to accept it. 1838 */ 1839 1840 neigh_update(neigh, lladdr, NUD_STALE, 1841 NEIGH_UPDATE_F_WEAK_OVERRIDE| 1842 NEIGH_UPDATE_F_OVERRIDE| 1843 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| 1844 NEIGH_UPDATE_F_ISROUTER)) 1845 ); 1846 1847 nrt = ip6_rt_copy(rt, &msg->dest); 1848 if (!nrt) 1849 goto out; 1850 1851 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; 1852 if (on_link) 1853 nrt->rt6i_flags &= ~RTF_GATEWAY; 1854 1855 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; 1856 1857 if (ip6_ins_rt(nrt)) 1858 goto out; 1859 1860 netevent.old = &rt->dst; 1861 netevent.new = &nrt->dst; 1862 netevent.daddr = &msg->dest; 1863 netevent.neigh = neigh; 1864 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); 1865 1866 if (rt->rt6i_flags & RTF_CACHE) { 1867 rt = (struct rt6_info *) dst_clone(&rt->dst); 1868 ip6_del_rt(rt); 1869 } 1870 1871 out: 1872 neigh_release(neigh); 1873 } 1874 1875 /* 1876 * Misc support functions 1877 */ 1878 1879 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 1880 const struct in6_addr *dest) 1881 { 1882 struct net *net = dev_net(ort->dst.dev); 1883 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, 1884 ort->rt6i_table); 1885 1886 if (rt) { 1887 rt->dst.input = ort->dst.input; 1888 rt->dst.output = ort->dst.output; 1889 rt->dst.flags |= DST_HOST; 1890 1891 rt->rt6i_dst.addr = *dest; 1892 rt->rt6i_dst.plen = 128; 1893 dst_copy_metrics(&rt->dst, &ort->dst); 1894 rt->dst.error = ort->dst.error; 1895 rt->rt6i_idev = ort->rt6i_idev; 1896 if (rt->rt6i_idev) 1897 in6_dev_hold(rt->rt6i_idev); 1898 rt->dst.lastuse = jiffies; 1899 1900 if (ort->rt6i_flags & RTF_GATEWAY) 1901 rt->rt6i_gateway = ort->rt6i_gateway; 1902 else 1903 rt->rt6i_gateway = *dest; 1904 rt->rt6i_flags = ort->rt6i_flags; 1905 if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == 1906 (RTF_DEFAULT | RTF_ADDRCONF)) 1907 rt6_set_from(rt, ort); 1908 rt->rt6i_metric = 0; 1909 1910 #ifdef CONFIG_IPV6_SUBTREES 1911 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1912 #endif 1913 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); 1914 rt->rt6i_table = ort->rt6i_table; 1915 } 1916 return rt; 1917 } 1918 1919 #ifdef CONFIG_IPV6_ROUTE_INFO 1920 static struct rt6_info *rt6_get_route_info(struct net *net, 1921 const struct in6_addr *prefix, int prefixlen, 1922 const struct in6_addr *gwaddr, int ifindex) 1923 { 1924 struct fib6_node *fn; 1925 struct rt6_info *rt = NULL; 1926 struct fib6_table *table; 1927 1928 table = fib6_get_table(net, RT6_TABLE_INFO); 1929 if (!table) 1930 return NULL; 1931 1932 read_lock_bh(&table->tb6_lock); 1933 fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); 1934 if (!fn) 1935 goto out; 1936 1937 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1938 if (rt->dst.dev->ifindex != ifindex) 1939 continue; 1940 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) 1941 continue; 1942 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) 1943 continue; 1944 dst_hold(&rt->dst); 1945 break; 1946 } 1947 out: 1948 read_unlock_bh(&table->tb6_lock); 1949 return rt; 1950 } 1951 1952 static struct rt6_info *rt6_add_route_info(struct net *net, 1953 const struct in6_addr *prefix, int prefixlen, 1954 const struct in6_addr *gwaddr, int ifindex, 1955 unsigned int pref) 1956 { 1957 struct fib6_config cfg = { 1958 .fc_table = RT6_TABLE_INFO, 1959 .fc_metric = IP6_RT_PRIO_USER, 1960 .fc_ifindex = ifindex, 1961 .fc_dst_len = prefixlen, 1962 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | 1963 RTF_UP | RTF_PREF(pref), 1964 .fc_nlinfo.portid = 0, 1965 .fc_nlinfo.nlh = NULL, 1966 .fc_nlinfo.nl_net = net, 1967 }; 1968 1969 cfg.fc_dst = *prefix; 1970 cfg.fc_gateway = *gwaddr; 1971 1972 /* We should treat it as a default route if prefix length is 0. */ 1973 if (!prefixlen) 1974 cfg.fc_flags |= RTF_DEFAULT; 1975 1976 ip6_route_add(&cfg); 1977 1978 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); 1979 } 1980 #endif 1981 1982 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) 1983 { 1984 struct rt6_info *rt; 1985 struct fib6_table *table; 1986 1987 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); 1988 if (!table) 1989 return NULL; 1990 1991 read_lock_bh(&table->tb6_lock); 1992 for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { 1993 if (dev == rt->dst.dev && 1994 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && 1995 ipv6_addr_equal(&rt->rt6i_gateway, addr)) 1996 break; 1997 } 1998 if (rt) 1999 dst_hold(&rt->dst); 2000 read_unlock_bh(&table->tb6_lock); 2001 return rt; 2002 } 2003 2004 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 2005 struct net_device *dev, 2006 unsigned int pref) 2007 { 2008 struct fib6_config cfg = { 2009 .fc_table = RT6_TABLE_DFLT, 2010 .fc_metric = IP6_RT_PRIO_USER, 2011 .fc_ifindex = dev->ifindex, 2012 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | 2013 RTF_UP | RTF_EXPIRES | RTF_PREF(pref), 2014 .fc_nlinfo.portid = 0, 2015 .fc_nlinfo.nlh = NULL, 2016 .fc_nlinfo.nl_net = dev_net(dev), 2017 }; 2018 2019 cfg.fc_gateway = *gwaddr; 2020 2021 ip6_route_add(&cfg); 2022 2023 return rt6_get_dflt_router(gwaddr, dev); 2024 } 2025 2026 void rt6_purge_dflt_routers(struct net *net) 2027 { 2028 struct rt6_info *rt; 2029 struct fib6_table *table; 2030 2031 /* NOTE: Keep consistent with rt6_get_dflt_router */ 2032 table = fib6_get_table(net, RT6_TABLE_DFLT); 2033 if (!table) 2034 return; 2035 2036 restart: 2037 read_lock_bh(&table->tb6_lock); 2038 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { 2039 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && 2040 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { 2041 dst_hold(&rt->dst); 2042 read_unlock_bh(&table->tb6_lock); 2043 ip6_del_rt(rt); 2044 goto restart; 2045 } 2046 } 2047 read_unlock_bh(&table->tb6_lock); 2048 } 2049 2050 static void rtmsg_to_fib6_config(struct net *net, 2051 struct in6_rtmsg *rtmsg, 2052 struct fib6_config *cfg) 2053 { 2054 memset(cfg, 0, sizeof(*cfg)); 2055 2056 cfg->fc_table = RT6_TABLE_MAIN; 2057 cfg->fc_ifindex = rtmsg->rtmsg_ifindex; 2058 cfg->fc_metric = rtmsg->rtmsg_metric; 2059 cfg->fc_expires = rtmsg->rtmsg_info; 2060 cfg->fc_dst_len = rtmsg->rtmsg_dst_len; 2061 cfg->fc_src_len = rtmsg->rtmsg_src_len; 2062 cfg->fc_flags = rtmsg->rtmsg_flags; 2063 2064 cfg->fc_nlinfo.nl_net = net; 2065 2066 cfg->fc_dst = rtmsg->rtmsg_dst; 2067 cfg->fc_src = rtmsg->rtmsg_src; 2068 cfg->fc_gateway = rtmsg->rtmsg_gateway; 2069 } 2070 2071 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) 2072 { 2073 struct fib6_config cfg; 2074 struct in6_rtmsg rtmsg; 2075 int err; 2076 2077 switch(cmd) { 2078 case SIOCADDRT: /* Add a route */ 2079 case SIOCDELRT: /* Delete a route */ 2080 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2081 return -EPERM; 2082 err = copy_from_user(&rtmsg, arg, 2083 sizeof(struct in6_rtmsg)); 2084 if (err) 2085 return -EFAULT; 2086 2087 rtmsg_to_fib6_config(net, &rtmsg, &cfg); 2088 2089 rtnl_lock(); 2090 switch (cmd) { 2091 case SIOCADDRT: 2092 err = ip6_route_add(&cfg); 2093 break; 2094 case SIOCDELRT: 2095 err = ip6_route_del(&cfg); 2096 break; 2097 default: 2098 err = -EINVAL; 2099 } 2100 rtnl_unlock(); 2101 2102 return err; 2103 } 2104 2105 return -EINVAL; 2106 } 2107 2108 /* 2109 * Drop the packet on the floor 2110 */ 2111 2112 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) 2113 { 2114 int type; 2115 struct dst_entry *dst = skb_dst(skb); 2116 switch (ipstats_mib_noroutes) { 2117 case IPSTATS_MIB_INNOROUTES: 2118 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); 2119 if (type == IPV6_ADDR_ANY) { 2120 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2121 IPSTATS_MIB_INADDRERRORS); 2122 break; 2123 } 2124 /* FALLTHROUGH */ 2125 case IPSTATS_MIB_OUTNOROUTES: 2126 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2127 ipstats_mib_noroutes); 2128 break; 2129 } 2130 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); 2131 kfree_skb(skb); 2132 return 0; 2133 } 2134 2135 static int ip6_pkt_discard(struct sk_buff *skb) 2136 { 2137 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); 2138 } 2139 2140 static int ip6_pkt_discard_out(struct sk_buff *skb) 2141 { 2142 skb->dev = skb_dst(skb)->dev; 2143 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); 2144 } 2145 2146 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 2147 2148 static int ip6_pkt_prohibit(struct sk_buff *skb) 2149 { 2150 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); 2151 } 2152 2153 static int ip6_pkt_prohibit_out(struct sk_buff *skb) 2154 { 2155 skb->dev = skb_dst(skb)->dev; 2156 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); 2157 } 2158 2159 #endif 2160 2161 /* 2162 * Allocate a dst for local (unicast / anycast) address. 2163 */ 2164 2165 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 2166 const struct in6_addr *addr, 2167 bool anycast) 2168 { 2169 struct net *net = dev_net(idev->dev); 2170 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 0, NULL); 2171 2172 if (!rt) { 2173 net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); 2174 return ERR_PTR(-ENOMEM); 2175 } 2176 2177 in6_dev_hold(idev); 2178 2179 rt->dst.flags |= DST_HOST; 2180 rt->dst.input = ip6_input; 2181 rt->dst.output = ip6_output; 2182 rt->rt6i_idev = idev; 2183 2184 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; 2185 if (anycast) 2186 rt->rt6i_flags |= RTF_ANYCAST; 2187 else 2188 rt->rt6i_flags |= RTF_LOCAL; 2189 2190 rt->rt6i_gateway = *addr; 2191 rt->rt6i_dst.addr = *addr; 2192 rt->rt6i_dst.plen = 128; 2193 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); 2194 2195 atomic_set(&rt->dst.__refcnt, 1); 2196 2197 return rt; 2198 } 2199 2200 int ip6_route_get_saddr(struct net *net, 2201 struct rt6_info *rt, 2202 const struct in6_addr *daddr, 2203 unsigned int prefs, 2204 struct in6_addr *saddr) 2205 { 2206 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); 2207 int err = 0; 2208 if (rt->rt6i_prefsrc.plen) 2209 *saddr = rt->rt6i_prefsrc.addr; 2210 else 2211 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 2212 daddr, prefs, saddr); 2213 return err; 2214 } 2215 2216 /* remove deleted ip from prefsrc entries */ 2217 struct arg_dev_net_ip { 2218 struct net_device *dev; 2219 struct net *net; 2220 struct in6_addr *addr; 2221 }; 2222 2223 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) 2224 { 2225 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; 2226 struct net *net = ((struct arg_dev_net_ip *)arg)->net; 2227 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; 2228 2229 if (((void *)rt->dst.dev == dev || !dev) && 2230 rt != net->ipv6.ip6_null_entry && 2231 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { 2232 /* remove prefsrc entry */ 2233 rt->rt6i_prefsrc.plen = 0; 2234 } 2235 return 0; 2236 } 2237 2238 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) 2239 { 2240 struct net *net = dev_net(ifp->idev->dev); 2241 struct arg_dev_net_ip adni = { 2242 .dev = ifp->idev->dev, 2243 .net = net, 2244 .addr = &ifp->addr, 2245 }; 2246 fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); 2247 } 2248 2249 struct arg_dev_net { 2250 struct net_device *dev; 2251 struct net *net; 2252 }; 2253 2254 static int fib6_ifdown(struct rt6_info *rt, void *arg) 2255 { 2256 const struct arg_dev_net *adn = arg; 2257 const struct net_device *dev = adn->dev; 2258 2259 if ((rt->dst.dev == dev || !dev) && 2260 rt != adn->net->ipv6.ip6_null_entry) 2261 return -1; 2262 2263 return 0; 2264 } 2265 2266 void rt6_ifdown(struct net *net, struct net_device *dev) 2267 { 2268 struct arg_dev_net adn = { 2269 .dev = dev, 2270 .net = net, 2271 }; 2272 2273 fib6_clean_all(net, fib6_ifdown, 0, &adn); 2274 icmp6_clean_all(fib6_ifdown, &adn); 2275 } 2276 2277 struct rt6_mtu_change_arg { 2278 struct net_device *dev; 2279 unsigned int mtu; 2280 }; 2281 2282 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) 2283 { 2284 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; 2285 struct inet6_dev *idev; 2286 2287 /* In IPv6 pmtu discovery is not optional, 2288 so that RTAX_MTU lock cannot disable it. 2289 We still use this lock to block changes 2290 caused by addrconf/ndisc. 2291 */ 2292 2293 idev = __in6_dev_get(arg->dev); 2294 if (!idev) 2295 return 0; 2296 2297 /* For administrative MTU increase, there is no way to discover 2298 IPv6 PMTU increase, so PMTU increase should be updated here. 2299 Since RFC 1981 doesn't include administrative MTU increase 2300 update PMTU increase is a MUST. (i.e. jumbo frame) 2301 */ 2302 /* 2303 If new MTU is less than route PMTU, this new MTU will be the 2304 lowest MTU in the path, update the route PMTU to reflect PMTU 2305 decreases; if new MTU is greater than route PMTU, and the 2306 old MTU is the lowest MTU in the path, update the route PMTU 2307 to reflect the increase. In this case if the other nodes' MTU 2308 also have the lowest MTU, TOO BIG MESSAGE will be lead to 2309 PMTU discouvery. 2310 */ 2311 if (rt->dst.dev == arg->dev && 2312 !dst_metric_locked(&rt->dst, RTAX_MTU) && 2313 (dst_mtu(&rt->dst) >= arg->mtu || 2314 (dst_mtu(&rt->dst) < arg->mtu && 2315 dst_mtu(&rt->dst) == idev->cnf.mtu6))) { 2316 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); 2317 } 2318 return 0; 2319 } 2320 2321 void rt6_mtu_change(struct net_device *dev, unsigned int mtu) 2322 { 2323 struct rt6_mtu_change_arg arg = { 2324 .dev = dev, 2325 .mtu = mtu, 2326 }; 2327 2328 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); 2329 } 2330 2331 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { 2332 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, 2333 [RTA_OIF] = { .type = NLA_U32 }, 2334 [RTA_IIF] = { .type = NLA_U32 }, 2335 [RTA_PRIORITY] = { .type = NLA_U32 }, 2336 [RTA_METRICS] = { .type = NLA_NESTED }, 2337 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 2338 }; 2339 2340 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, 2341 struct fib6_config *cfg) 2342 { 2343 struct rtmsg *rtm; 2344 struct nlattr *tb[RTA_MAX+1]; 2345 int err; 2346 2347 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2348 if (err < 0) 2349 goto errout; 2350 2351 err = -EINVAL; 2352 rtm = nlmsg_data(nlh); 2353 memset(cfg, 0, sizeof(*cfg)); 2354 2355 cfg->fc_table = rtm->rtm_table; 2356 cfg->fc_dst_len = rtm->rtm_dst_len; 2357 cfg->fc_src_len = rtm->rtm_src_len; 2358 cfg->fc_flags = RTF_UP; 2359 cfg->fc_protocol = rtm->rtm_protocol; 2360 cfg->fc_type = rtm->rtm_type; 2361 2362 if (rtm->rtm_type == RTN_UNREACHABLE || 2363 rtm->rtm_type == RTN_BLACKHOLE || 2364 rtm->rtm_type == RTN_PROHIBIT || 2365 rtm->rtm_type == RTN_THROW) 2366 cfg->fc_flags |= RTF_REJECT; 2367 2368 if (rtm->rtm_type == RTN_LOCAL) 2369 cfg->fc_flags |= RTF_LOCAL; 2370 2371 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 2372 cfg->fc_nlinfo.nlh = nlh; 2373 cfg->fc_nlinfo.nl_net = sock_net(skb->sk); 2374 2375 if (tb[RTA_GATEWAY]) { 2376 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); 2377 cfg->fc_flags |= RTF_GATEWAY; 2378 } 2379 2380 if (tb[RTA_DST]) { 2381 int plen = (rtm->rtm_dst_len + 7) >> 3; 2382 2383 if (nla_len(tb[RTA_DST]) < plen) 2384 goto errout; 2385 2386 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); 2387 } 2388 2389 if (tb[RTA_SRC]) { 2390 int plen = (rtm->rtm_src_len + 7) >> 3; 2391 2392 if (nla_len(tb[RTA_SRC]) < plen) 2393 goto errout; 2394 2395 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); 2396 } 2397 2398 if (tb[RTA_PREFSRC]) 2399 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); 2400 2401 if (tb[RTA_OIF]) 2402 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); 2403 2404 if (tb[RTA_PRIORITY]) 2405 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); 2406 2407 if (tb[RTA_METRICS]) { 2408 cfg->fc_mx = nla_data(tb[RTA_METRICS]); 2409 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); 2410 } 2411 2412 if (tb[RTA_TABLE]) 2413 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); 2414 2415 if (tb[RTA_MULTIPATH]) { 2416 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); 2417 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); 2418 } 2419 2420 err = 0; 2421 errout: 2422 return err; 2423 } 2424 2425 static int ip6_route_multipath(struct fib6_config *cfg, int add) 2426 { 2427 struct fib6_config r_cfg; 2428 struct rtnexthop *rtnh; 2429 int remaining; 2430 int attrlen; 2431 int err = 0, last_err = 0; 2432 2433 beginning: 2434 rtnh = (struct rtnexthop *)cfg->fc_mp; 2435 remaining = cfg->fc_mp_len; 2436 2437 /* Parse a Multipath Entry */ 2438 while (rtnh_ok(rtnh, remaining)) { 2439 memcpy(&r_cfg, cfg, sizeof(*cfg)); 2440 if (rtnh->rtnh_ifindex) 2441 r_cfg.fc_ifindex = rtnh->rtnh_ifindex; 2442 2443 attrlen = rtnh_attrlen(rtnh); 2444 if (attrlen > 0) { 2445 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 2446 2447 nla = nla_find(attrs, attrlen, RTA_GATEWAY); 2448 if (nla) { 2449 nla_memcpy(&r_cfg.fc_gateway, nla, 16); 2450 r_cfg.fc_flags |= RTF_GATEWAY; 2451 } 2452 } 2453 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); 2454 if (err) { 2455 last_err = err; 2456 /* If we are trying to remove a route, do not stop the 2457 * loop when ip6_route_del() fails (because next hop is 2458 * already gone), we should try to remove all next hops. 2459 */ 2460 if (add) { 2461 /* If add fails, we should try to delete all 2462 * next hops that have been already added. 2463 */ 2464 add = 0; 2465 goto beginning; 2466 } 2467 } 2468 /* Because each route is added like a single route we remove 2469 * this flag after the first nexthop (if there is a collision, 2470 * we have already fail to add the first nexthop: 2471 * fib6_add_rt2node() has reject it). 2472 */ 2473 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; 2474 rtnh = rtnh_next(rtnh, &remaining); 2475 } 2476 2477 return last_err; 2478 } 2479 2480 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh) 2481 { 2482 struct fib6_config cfg; 2483 int err; 2484 2485 err = rtm_to_fib6_config(skb, nlh, &cfg); 2486 if (err < 0) 2487 return err; 2488 2489 if (cfg.fc_mp) 2490 return ip6_route_multipath(&cfg, 0); 2491 else 2492 return ip6_route_del(&cfg); 2493 } 2494 2495 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh) 2496 { 2497 struct fib6_config cfg; 2498 int err; 2499 2500 err = rtm_to_fib6_config(skb, nlh, &cfg); 2501 if (err < 0) 2502 return err; 2503 2504 if (cfg.fc_mp) 2505 return ip6_route_multipath(&cfg, 1); 2506 else 2507 return ip6_route_add(&cfg); 2508 } 2509 2510 static inline size_t rt6_nlmsg_size(void) 2511 { 2512 return NLMSG_ALIGN(sizeof(struct rtmsg)) 2513 + nla_total_size(16) /* RTA_SRC */ 2514 + nla_total_size(16) /* RTA_DST */ 2515 + nla_total_size(16) /* RTA_GATEWAY */ 2516 + nla_total_size(16) /* RTA_PREFSRC */ 2517 + nla_total_size(4) /* RTA_TABLE */ 2518 + nla_total_size(4) /* RTA_IIF */ 2519 + nla_total_size(4) /* RTA_OIF */ 2520 + nla_total_size(4) /* RTA_PRIORITY */ 2521 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ 2522 + nla_total_size(sizeof(struct rta_cacheinfo)); 2523 } 2524 2525 static int rt6_fill_node(struct net *net, 2526 struct sk_buff *skb, struct rt6_info *rt, 2527 struct in6_addr *dst, struct in6_addr *src, 2528 int iif, int type, u32 portid, u32 seq, 2529 int prefix, int nowait, unsigned int flags) 2530 { 2531 struct rtmsg *rtm; 2532 struct nlmsghdr *nlh; 2533 long expires; 2534 u32 table; 2535 2536 if (prefix) { /* user wants prefix routes only */ 2537 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { 2538 /* success since this is not a prefix route */ 2539 return 1; 2540 } 2541 } 2542 2543 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); 2544 if (!nlh) 2545 return -EMSGSIZE; 2546 2547 rtm = nlmsg_data(nlh); 2548 rtm->rtm_family = AF_INET6; 2549 rtm->rtm_dst_len = rt->rt6i_dst.plen; 2550 rtm->rtm_src_len = rt->rt6i_src.plen; 2551 rtm->rtm_tos = 0; 2552 if (rt->rt6i_table) 2553 table = rt->rt6i_table->tb6_id; 2554 else 2555 table = RT6_TABLE_UNSPEC; 2556 rtm->rtm_table = table; 2557 if (nla_put_u32(skb, RTA_TABLE, table)) 2558 goto nla_put_failure; 2559 if (rt->rt6i_flags & RTF_REJECT) { 2560 switch (rt->dst.error) { 2561 case -EINVAL: 2562 rtm->rtm_type = RTN_BLACKHOLE; 2563 break; 2564 case -EACCES: 2565 rtm->rtm_type = RTN_PROHIBIT; 2566 break; 2567 case -EAGAIN: 2568 rtm->rtm_type = RTN_THROW; 2569 break; 2570 default: 2571 rtm->rtm_type = RTN_UNREACHABLE; 2572 break; 2573 } 2574 } 2575 else if (rt->rt6i_flags & RTF_LOCAL) 2576 rtm->rtm_type = RTN_LOCAL; 2577 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) 2578 rtm->rtm_type = RTN_LOCAL; 2579 else 2580 rtm->rtm_type = RTN_UNICAST; 2581 rtm->rtm_flags = 0; 2582 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2583 rtm->rtm_protocol = rt->rt6i_protocol; 2584 if (rt->rt6i_flags & RTF_DYNAMIC) 2585 rtm->rtm_protocol = RTPROT_REDIRECT; 2586 else if (rt->rt6i_flags & RTF_ADDRCONF) { 2587 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) 2588 rtm->rtm_protocol = RTPROT_RA; 2589 else 2590 rtm->rtm_protocol = RTPROT_KERNEL; 2591 } 2592 2593 if (rt->rt6i_flags & RTF_CACHE) 2594 rtm->rtm_flags |= RTM_F_CLONED; 2595 2596 if (dst) { 2597 if (nla_put(skb, RTA_DST, 16, dst)) 2598 goto nla_put_failure; 2599 rtm->rtm_dst_len = 128; 2600 } else if (rtm->rtm_dst_len) 2601 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) 2602 goto nla_put_failure; 2603 #ifdef CONFIG_IPV6_SUBTREES 2604 if (src) { 2605 if (nla_put(skb, RTA_SRC, 16, src)) 2606 goto nla_put_failure; 2607 rtm->rtm_src_len = 128; 2608 } else if (rtm->rtm_src_len && 2609 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) 2610 goto nla_put_failure; 2611 #endif 2612 if (iif) { 2613 #ifdef CONFIG_IPV6_MROUTE 2614 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { 2615 int err = ip6mr_get_route(net, skb, rtm, nowait); 2616 if (err <= 0) { 2617 if (!nowait) { 2618 if (err == 0) 2619 return 0; 2620 goto nla_put_failure; 2621 } else { 2622 if (err == -EMSGSIZE) 2623 goto nla_put_failure; 2624 } 2625 } 2626 } else 2627 #endif 2628 if (nla_put_u32(skb, RTA_IIF, iif)) 2629 goto nla_put_failure; 2630 } else if (dst) { 2631 struct in6_addr saddr_buf; 2632 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && 2633 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2634 goto nla_put_failure; 2635 } 2636 2637 if (rt->rt6i_prefsrc.plen) { 2638 struct in6_addr saddr_buf; 2639 saddr_buf = rt->rt6i_prefsrc.addr; 2640 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2641 goto nla_put_failure; 2642 } 2643 2644 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) 2645 goto nla_put_failure; 2646 2647 if (rt->rt6i_flags & RTF_GATEWAY) { 2648 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) 2649 goto nla_put_failure; 2650 } 2651 2652 if (rt->dst.dev && 2653 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) 2654 goto nla_put_failure; 2655 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) 2656 goto nla_put_failure; 2657 2658 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; 2659 2660 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) 2661 goto nla_put_failure; 2662 2663 return nlmsg_end(skb, nlh); 2664 2665 nla_put_failure: 2666 nlmsg_cancel(skb, nlh); 2667 return -EMSGSIZE; 2668 } 2669 2670 int rt6_dump_route(struct rt6_info *rt, void *p_arg) 2671 { 2672 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; 2673 int prefix; 2674 2675 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { 2676 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); 2677 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; 2678 } else 2679 prefix = 0; 2680 2681 return rt6_fill_node(arg->net, 2682 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, 2683 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, 2684 prefix, 0, NLM_F_MULTI); 2685 } 2686 2687 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh) 2688 { 2689 struct net *net = sock_net(in_skb->sk); 2690 struct nlattr *tb[RTA_MAX+1]; 2691 struct rt6_info *rt; 2692 struct sk_buff *skb; 2693 struct rtmsg *rtm; 2694 struct flowi6 fl6; 2695 int err, iif = 0, oif = 0; 2696 2697 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2698 if (err < 0) 2699 goto errout; 2700 2701 err = -EINVAL; 2702 memset(&fl6, 0, sizeof(fl6)); 2703 2704 if (tb[RTA_SRC]) { 2705 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) 2706 goto errout; 2707 2708 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); 2709 } 2710 2711 if (tb[RTA_DST]) { 2712 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) 2713 goto errout; 2714 2715 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); 2716 } 2717 2718 if (tb[RTA_IIF]) 2719 iif = nla_get_u32(tb[RTA_IIF]); 2720 2721 if (tb[RTA_OIF]) 2722 oif = nla_get_u32(tb[RTA_OIF]); 2723 2724 if (iif) { 2725 struct net_device *dev; 2726 int flags = 0; 2727 2728 dev = __dev_get_by_index(net, iif); 2729 if (!dev) { 2730 err = -ENODEV; 2731 goto errout; 2732 } 2733 2734 fl6.flowi6_iif = iif; 2735 2736 if (!ipv6_addr_any(&fl6.saddr)) 2737 flags |= RT6_LOOKUP_F_HAS_SADDR; 2738 2739 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, 2740 flags); 2741 } else { 2742 fl6.flowi6_oif = oif; 2743 2744 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); 2745 } 2746 2747 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2748 if (!skb) { 2749 ip6_rt_put(rt); 2750 err = -ENOBUFS; 2751 goto errout; 2752 } 2753 2754 /* Reserve room for dummy headers, this skb can pass 2755 through good chunk of routing engine. 2756 */ 2757 skb_reset_mac_header(skb); 2758 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); 2759 2760 skb_dst_set(skb, &rt->dst); 2761 2762 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, 2763 RTM_NEWROUTE, NETLINK_CB(in_skb).portid, 2764 nlh->nlmsg_seq, 0, 0, 0); 2765 if (err < 0) { 2766 kfree_skb(skb); 2767 goto errout; 2768 } 2769 2770 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2771 errout: 2772 return err; 2773 } 2774 2775 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) 2776 { 2777 struct sk_buff *skb; 2778 struct net *net = info->nl_net; 2779 u32 seq; 2780 int err; 2781 2782 err = -ENOBUFS; 2783 seq = info->nlh ? info->nlh->nlmsg_seq : 0; 2784 2785 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); 2786 if (!skb) 2787 goto errout; 2788 2789 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, 2790 event, info->portid, seq, 0, 0, 0); 2791 if (err < 0) { 2792 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ 2793 WARN_ON(err == -EMSGSIZE); 2794 kfree_skb(skb); 2795 goto errout; 2796 } 2797 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, 2798 info->nlh, gfp_any()); 2799 return; 2800 errout: 2801 if (err < 0) 2802 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); 2803 } 2804 2805 static int ip6_route_dev_notify(struct notifier_block *this, 2806 unsigned long event, void *ptr) 2807 { 2808 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2809 struct net *net = dev_net(dev); 2810 2811 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { 2812 net->ipv6.ip6_null_entry->dst.dev = dev; 2813 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); 2814 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 2815 net->ipv6.ip6_prohibit_entry->dst.dev = dev; 2816 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); 2817 net->ipv6.ip6_blk_hole_entry->dst.dev = dev; 2818 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); 2819 #endif 2820 } 2821 2822 return NOTIFY_OK; 2823 } 2824 2825 /* 2826 * /proc 2827 */ 2828 2829 #ifdef CONFIG_PROC_FS 2830 2831 struct rt6_proc_arg 2832 { 2833 char *buffer; 2834 int offset; 2835 int length; 2836 int skip; 2837 int len; 2838 }; 2839 2840 static int rt6_info_route(struct rt6_info *rt, void *p_arg) 2841 { 2842 struct seq_file *m = p_arg; 2843 2844 seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); 2845 2846 #ifdef CONFIG_IPV6_SUBTREES 2847 seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); 2848 #else 2849 seq_puts(m, "00000000000000000000000000000000 00 "); 2850 #endif 2851 if (rt->rt6i_flags & RTF_GATEWAY) { 2852 seq_printf(m, "%pi6", &rt->rt6i_gateway); 2853 } else { 2854 seq_puts(m, "00000000000000000000000000000000"); 2855 } 2856 seq_printf(m, " %08x %08x %08x %08x %8s\n", 2857 rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), 2858 rt->dst.__use, rt->rt6i_flags, 2859 rt->dst.dev ? rt->dst.dev->name : ""); 2860 return 0; 2861 } 2862 2863 static int ipv6_route_show(struct seq_file *m, void *v) 2864 { 2865 struct net *net = (struct net *)m->private; 2866 fib6_clean_all_ro(net, rt6_info_route, 0, m); 2867 return 0; 2868 } 2869 2870 static int ipv6_route_open(struct inode *inode, struct file *file) 2871 { 2872 return single_open_net(inode, file, ipv6_route_show); 2873 } 2874 2875 static const struct file_operations ipv6_route_proc_fops = { 2876 .owner = THIS_MODULE, 2877 .open = ipv6_route_open, 2878 .read = seq_read, 2879 .llseek = seq_lseek, 2880 .release = single_release_net, 2881 }; 2882 2883 static int rt6_stats_seq_show(struct seq_file *seq, void *v) 2884 { 2885 struct net *net = (struct net *)seq->private; 2886 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", 2887 net->ipv6.rt6_stats->fib_nodes, 2888 net->ipv6.rt6_stats->fib_route_nodes, 2889 net->ipv6.rt6_stats->fib_rt_alloc, 2890 net->ipv6.rt6_stats->fib_rt_entries, 2891 net->ipv6.rt6_stats->fib_rt_cache, 2892 dst_entries_get_slow(&net->ipv6.ip6_dst_ops), 2893 net->ipv6.rt6_stats->fib_discarded_routes); 2894 2895 return 0; 2896 } 2897 2898 static int rt6_stats_seq_open(struct inode *inode, struct file *file) 2899 { 2900 return single_open_net(inode, file, rt6_stats_seq_show); 2901 } 2902 2903 static const struct file_operations rt6_stats_seq_fops = { 2904 .owner = THIS_MODULE, 2905 .open = rt6_stats_seq_open, 2906 .read = seq_read, 2907 .llseek = seq_lseek, 2908 .release = single_release_net, 2909 }; 2910 #endif /* CONFIG_PROC_FS */ 2911 2912 #ifdef CONFIG_SYSCTL 2913 2914 static 2915 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, 2916 void __user *buffer, size_t *lenp, loff_t *ppos) 2917 { 2918 struct net *net; 2919 int delay; 2920 if (!write) 2921 return -EINVAL; 2922 2923 net = (struct net *)ctl->extra1; 2924 delay = net->ipv6.sysctl.flush_delay; 2925 proc_dointvec(ctl, write, buffer, lenp, ppos); 2926 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); 2927 return 0; 2928 } 2929 2930 struct ctl_table ipv6_route_table_template[] = { 2931 { 2932 .procname = "flush", 2933 .data = &init_net.ipv6.sysctl.flush_delay, 2934 .maxlen = sizeof(int), 2935 .mode = 0200, 2936 .proc_handler = ipv6_sysctl_rtcache_flush 2937 }, 2938 { 2939 .procname = "gc_thresh", 2940 .data = &ip6_dst_ops_template.gc_thresh, 2941 .maxlen = sizeof(int), 2942 .mode = 0644, 2943 .proc_handler = proc_dointvec, 2944 }, 2945 { 2946 .procname = "max_size", 2947 .data = &init_net.ipv6.sysctl.ip6_rt_max_size, 2948 .maxlen = sizeof(int), 2949 .mode = 0644, 2950 .proc_handler = proc_dointvec, 2951 }, 2952 { 2953 .procname = "gc_min_interval", 2954 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 2955 .maxlen = sizeof(int), 2956 .mode = 0644, 2957 .proc_handler = proc_dointvec_jiffies, 2958 }, 2959 { 2960 .procname = "gc_timeout", 2961 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, 2962 .maxlen = sizeof(int), 2963 .mode = 0644, 2964 .proc_handler = proc_dointvec_jiffies, 2965 }, 2966 { 2967 .procname = "gc_interval", 2968 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, 2969 .maxlen = sizeof(int), 2970 .mode = 0644, 2971 .proc_handler = proc_dointvec_jiffies, 2972 }, 2973 { 2974 .procname = "gc_elasticity", 2975 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, 2976 .maxlen = sizeof(int), 2977 .mode = 0644, 2978 .proc_handler = proc_dointvec, 2979 }, 2980 { 2981 .procname = "mtu_expires", 2982 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, 2983 .maxlen = sizeof(int), 2984 .mode = 0644, 2985 .proc_handler = proc_dointvec_jiffies, 2986 }, 2987 { 2988 .procname = "min_adv_mss", 2989 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, 2990 .maxlen = sizeof(int), 2991 .mode = 0644, 2992 .proc_handler = proc_dointvec, 2993 }, 2994 { 2995 .procname = "gc_min_interval_ms", 2996 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 2997 .maxlen = sizeof(int), 2998 .mode = 0644, 2999 .proc_handler = proc_dointvec_ms_jiffies, 3000 }, 3001 { } 3002 }; 3003 3004 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) 3005 { 3006 struct ctl_table *table; 3007 3008 table = kmemdup(ipv6_route_table_template, 3009 sizeof(ipv6_route_table_template), 3010 GFP_KERNEL); 3011 3012 if (table) { 3013 table[0].data = &net->ipv6.sysctl.flush_delay; 3014 table[0].extra1 = net; 3015 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; 3016 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; 3017 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 3018 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; 3019 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; 3020 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; 3021 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; 3022 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; 3023 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 3024 3025 /* Don't export sysctls to unprivileged users */ 3026 if (net->user_ns != &init_user_ns) 3027 table[0].procname = NULL; 3028 } 3029 3030 return table; 3031 } 3032 #endif 3033 3034 static int __net_init ip6_route_net_init(struct net *net) 3035 { 3036 int ret = -ENOMEM; 3037 3038 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, 3039 sizeof(net->ipv6.ip6_dst_ops)); 3040 3041 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) 3042 goto out_ip6_dst_ops; 3043 3044 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, 3045 sizeof(*net->ipv6.ip6_null_entry), 3046 GFP_KERNEL); 3047 if (!net->ipv6.ip6_null_entry) 3048 goto out_ip6_dst_entries; 3049 net->ipv6.ip6_null_entry->dst.path = 3050 (struct dst_entry *)net->ipv6.ip6_null_entry; 3051 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3052 dst_init_metrics(&net->ipv6.ip6_null_entry->dst, 3053 ip6_template_metrics, true); 3054 3055 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3056 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, 3057 sizeof(*net->ipv6.ip6_prohibit_entry), 3058 GFP_KERNEL); 3059 if (!net->ipv6.ip6_prohibit_entry) 3060 goto out_ip6_null_entry; 3061 net->ipv6.ip6_prohibit_entry->dst.path = 3062 (struct dst_entry *)net->ipv6.ip6_prohibit_entry; 3063 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3064 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, 3065 ip6_template_metrics, true); 3066 3067 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, 3068 sizeof(*net->ipv6.ip6_blk_hole_entry), 3069 GFP_KERNEL); 3070 if (!net->ipv6.ip6_blk_hole_entry) 3071 goto out_ip6_prohibit_entry; 3072 net->ipv6.ip6_blk_hole_entry->dst.path = 3073 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; 3074 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3075 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, 3076 ip6_template_metrics, true); 3077 #endif 3078 3079 net->ipv6.sysctl.flush_delay = 0; 3080 net->ipv6.sysctl.ip6_rt_max_size = 4096; 3081 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; 3082 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; 3083 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; 3084 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; 3085 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; 3086 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; 3087 3088 net->ipv6.ip6_rt_gc_expire = 30*HZ; 3089 3090 ret = 0; 3091 out: 3092 return ret; 3093 3094 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3095 out_ip6_prohibit_entry: 3096 kfree(net->ipv6.ip6_prohibit_entry); 3097 out_ip6_null_entry: 3098 kfree(net->ipv6.ip6_null_entry); 3099 #endif 3100 out_ip6_dst_entries: 3101 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3102 out_ip6_dst_ops: 3103 goto out; 3104 } 3105 3106 static void __net_exit ip6_route_net_exit(struct net *net) 3107 { 3108 kfree(net->ipv6.ip6_null_entry); 3109 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3110 kfree(net->ipv6.ip6_prohibit_entry); 3111 kfree(net->ipv6.ip6_blk_hole_entry); 3112 #endif 3113 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3114 } 3115 3116 static int __net_init ip6_route_net_init_late(struct net *net) 3117 { 3118 #ifdef CONFIG_PROC_FS 3119 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); 3120 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); 3121 #endif 3122 return 0; 3123 } 3124 3125 static void __net_exit ip6_route_net_exit_late(struct net *net) 3126 { 3127 #ifdef CONFIG_PROC_FS 3128 remove_proc_entry("ipv6_route", net->proc_net); 3129 remove_proc_entry("rt6_stats", net->proc_net); 3130 #endif 3131 } 3132 3133 static struct pernet_operations ip6_route_net_ops = { 3134 .init = ip6_route_net_init, 3135 .exit = ip6_route_net_exit, 3136 }; 3137 3138 static int __net_init ipv6_inetpeer_init(struct net *net) 3139 { 3140 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); 3141 3142 if (!bp) 3143 return -ENOMEM; 3144 inet_peer_base_init(bp); 3145 net->ipv6.peers = bp; 3146 return 0; 3147 } 3148 3149 static void __net_exit ipv6_inetpeer_exit(struct net *net) 3150 { 3151 struct inet_peer_base *bp = net->ipv6.peers; 3152 3153 net->ipv6.peers = NULL; 3154 inetpeer_invalidate_tree(bp); 3155 kfree(bp); 3156 } 3157 3158 static struct pernet_operations ipv6_inetpeer_ops = { 3159 .init = ipv6_inetpeer_init, 3160 .exit = ipv6_inetpeer_exit, 3161 }; 3162 3163 static struct pernet_operations ip6_route_net_late_ops = { 3164 .init = ip6_route_net_init_late, 3165 .exit = ip6_route_net_exit_late, 3166 }; 3167 3168 static struct notifier_block ip6_route_dev_notifier = { 3169 .notifier_call = ip6_route_dev_notify, 3170 .priority = 0, 3171 }; 3172 3173 int __init ip6_route_init(void) 3174 { 3175 int ret; 3176 3177 ret = -ENOMEM; 3178 ip6_dst_ops_template.kmem_cachep = 3179 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, 3180 SLAB_HWCACHE_ALIGN, NULL); 3181 if (!ip6_dst_ops_template.kmem_cachep) 3182 goto out; 3183 3184 ret = dst_entries_init(&ip6_dst_blackhole_ops); 3185 if (ret) 3186 goto out_kmem_cache; 3187 3188 ret = register_pernet_subsys(&ipv6_inetpeer_ops); 3189 if (ret) 3190 goto out_dst_entries; 3191 3192 ret = register_pernet_subsys(&ip6_route_net_ops); 3193 if (ret) 3194 goto out_register_inetpeer; 3195 3196 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; 3197 3198 /* Registering of the loopback is done before this portion of code, 3199 * the loopback reference in rt6_info will not be taken, do it 3200 * manually for init_net */ 3201 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; 3202 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3203 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3204 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; 3205 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3206 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; 3207 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3208 #endif 3209 ret = fib6_init(); 3210 if (ret) 3211 goto out_register_subsys; 3212 3213 ret = xfrm6_init(); 3214 if (ret) 3215 goto out_fib6_init; 3216 3217 ret = fib6_rules_init(); 3218 if (ret) 3219 goto xfrm6_init; 3220 3221 ret = register_pernet_subsys(&ip6_route_net_late_ops); 3222 if (ret) 3223 goto fib6_rules_init; 3224 3225 ret = -ENOBUFS; 3226 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || 3227 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || 3228 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) 3229 goto out_register_late_subsys; 3230 3231 ret = register_netdevice_notifier(&ip6_route_dev_notifier); 3232 if (ret) 3233 goto out_register_late_subsys; 3234 3235 out: 3236 return ret; 3237 3238 out_register_late_subsys: 3239 unregister_pernet_subsys(&ip6_route_net_late_ops); 3240 fib6_rules_init: 3241 fib6_rules_cleanup(); 3242 xfrm6_init: 3243 xfrm6_fini(); 3244 out_fib6_init: 3245 fib6_gc_cleanup(); 3246 out_register_subsys: 3247 unregister_pernet_subsys(&ip6_route_net_ops); 3248 out_register_inetpeer: 3249 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3250 out_dst_entries: 3251 dst_entries_destroy(&ip6_dst_blackhole_ops); 3252 out_kmem_cache: 3253 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3254 goto out; 3255 } 3256 3257 void ip6_route_cleanup(void) 3258 { 3259 unregister_netdevice_notifier(&ip6_route_dev_notifier); 3260 unregister_pernet_subsys(&ip6_route_net_late_ops); 3261 fib6_rules_cleanup(); 3262 xfrm6_fini(); 3263 fib6_gc_cleanup(); 3264 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3265 unregister_pernet_subsys(&ip6_route_net_ops); 3266 dst_entries_destroy(&ip6_dst_blackhole_ops); 3267 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3268 } 3269