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 dst_cow_metrics_generic(dst, old); 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 INIT_LIST_HEAD(&rt->rt6i_siblings); 318 } 319 return rt; 320 } 321 322 static void ip6_dst_destroy(struct dst_entry *dst) 323 { 324 struct rt6_info *rt = (struct rt6_info *)dst; 325 struct inet6_dev *idev = rt->rt6i_idev; 326 struct dst_entry *from = dst->from; 327 328 if (!(rt->dst.flags & DST_HOST)) 329 dst_destroy_metrics_generic(dst); 330 331 if (idev) { 332 rt->rt6i_idev = NULL; 333 in6_dev_put(idev); 334 } 335 336 dst->from = NULL; 337 dst_release(from); 338 339 if (rt6_has_peer(rt)) { 340 struct inet_peer *peer = rt6_peer_ptr(rt); 341 inet_putpeer(peer); 342 } 343 } 344 345 static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, 346 int how) 347 { 348 struct rt6_info *rt = (struct rt6_info *)dst; 349 struct inet6_dev *idev = rt->rt6i_idev; 350 struct net_device *loopback_dev = 351 dev_net(dev)->loopback_dev; 352 353 if (dev != loopback_dev) { 354 if (idev && idev->dev == dev) { 355 struct inet6_dev *loopback_idev = 356 in6_dev_get(loopback_dev); 357 if (loopback_idev) { 358 rt->rt6i_idev = loopback_idev; 359 in6_dev_put(idev); 360 } 361 } 362 } 363 } 364 365 static bool rt6_check_expired(const struct rt6_info *rt) 366 { 367 if (rt->rt6i_flags & RTF_EXPIRES) { 368 if (time_after(jiffies, rt->dst.expires)) 369 return true; 370 } else if (rt->dst.from) { 371 return rt6_check_expired((struct rt6_info *) rt->dst.from); 372 } 373 return false; 374 } 375 376 /* Multipath route selection: 377 * Hash based function using packet header and flowlabel. 378 * Adapted from fib_info_hashfn() 379 */ 380 static int rt6_info_hash_nhsfn(unsigned int candidate_count, 381 const struct flowi6 *fl6) 382 { 383 unsigned int val = fl6->flowi6_proto; 384 385 val ^= ipv6_addr_hash(&fl6->daddr); 386 val ^= ipv6_addr_hash(&fl6->saddr); 387 388 /* Work only if this not encapsulated */ 389 switch (fl6->flowi6_proto) { 390 case IPPROTO_UDP: 391 case IPPROTO_TCP: 392 case IPPROTO_SCTP: 393 val ^= (__force u16)fl6->fl6_sport; 394 val ^= (__force u16)fl6->fl6_dport; 395 break; 396 397 case IPPROTO_ICMPV6: 398 val ^= (__force u16)fl6->fl6_icmp_type; 399 val ^= (__force u16)fl6->fl6_icmp_code; 400 break; 401 } 402 /* RFC6438 recommands to use flowlabel */ 403 val ^= (__force u32)fl6->flowlabel; 404 405 /* Perhaps, we need to tune, this function? */ 406 val = val ^ (val >> 7) ^ (val >> 12); 407 return val % candidate_count; 408 } 409 410 static struct rt6_info *rt6_multipath_select(struct rt6_info *match, 411 struct flowi6 *fl6, int oif, 412 int strict) 413 { 414 struct rt6_info *sibling, *next_sibling; 415 int route_choosen; 416 417 route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6); 418 /* Don't change the route, if route_choosen == 0 419 * (siblings does not include ourself) 420 */ 421 if (route_choosen) 422 list_for_each_entry_safe(sibling, next_sibling, 423 &match->rt6i_siblings, rt6i_siblings) { 424 route_choosen--; 425 if (route_choosen == 0) { 426 if (rt6_score_route(sibling, oif, strict) < 0) 427 break; 428 match = sibling; 429 break; 430 } 431 } 432 return match; 433 } 434 435 /* 436 * Route lookup. Any table->tb6_lock is implied. 437 */ 438 439 static inline struct rt6_info *rt6_device_match(struct net *net, 440 struct rt6_info *rt, 441 const struct in6_addr *saddr, 442 int oif, 443 int flags) 444 { 445 struct rt6_info *local = NULL; 446 struct rt6_info *sprt; 447 448 if (!oif && ipv6_addr_any(saddr)) 449 goto out; 450 451 for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { 452 struct net_device *dev = sprt->dst.dev; 453 454 if (oif) { 455 if (dev->ifindex == oif) 456 return sprt; 457 if (dev->flags & IFF_LOOPBACK) { 458 if (!sprt->rt6i_idev || 459 sprt->rt6i_idev->dev->ifindex != oif) { 460 if (flags & RT6_LOOKUP_F_IFACE && oif) 461 continue; 462 if (local && (!oif || 463 local->rt6i_idev->dev->ifindex == oif)) 464 continue; 465 } 466 local = sprt; 467 } 468 } else { 469 if (ipv6_chk_addr(net, saddr, dev, 470 flags & RT6_LOOKUP_F_IFACE)) 471 return sprt; 472 } 473 } 474 475 if (oif) { 476 if (local) 477 return local; 478 479 if (flags & RT6_LOOKUP_F_IFACE) 480 return net->ipv6.ip6_null_entry; 481 } 482 out: 483 return rt; 484 } 485 486 #ifdef CONFIG_IPV6_ROUTER_PREF 487 struct __rt6_probe_work { 488 struct work_struct work; 489 struct in6_addr target; 490 struct net_device *dev; 491 }; 492 493 static void rt6_probe_deferred(struct work_struct *w) 494 { 495 struct in6_addr mcaddr; 496 struct __rt6_probe_work *work = 497 container_of(w, struct __rt6_probe_work, work); 498 499 addrconf_addr_solict_mult(&work->target, &mcaddr); 500 ndisc_send_ns(work->dev, NULL, &work->target, &mcaddr, NULL); 501 dev_put(work->dev); 502 kfree(work); 503 } 504 505 static void rt6_probe(struct rt6_info *rt) 506 { 507 struct neighbour *neigh; 508 /* 509 * Okay, this does not seem to be appropriate 510 * for now, however, we need to check if it 511 * is really so; aka Router Reachability Probing. 512 * 513 * Router Reachability Probe MUST be rate-limited 514 * to no more than one per minute. 515 */ 516 if (!rt || !(rt->rt6i_flags & RTF_GATEWAY)) 517 return; 518 rcu_read_lock_bh(); 519 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 520 if (neigh) { 521 write_lock(&neigh->lock); 522 if (neigh->nud_state & NUD_VALID) 523 goto out; 524 } 525 526 if (!neigh || 527 time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { 528 struct __rt6_probe_work *work; 529 530 work = kmalloc(sizeof(*work), GFP_ATOMIC); 531 532 if (neigh && work) 533 __neigh_set_probe_once(neigh); 534 535 if (neigh) 536 write_unlock(&neigh->lock); 537 538 if (work) { 539 INIT_WORK(&work->work, rt6_probe_deferred); 540 work->target = rt->rt6i_gateway; 541 dev_hold(rt->dst.dev); 542 work->dev = rt->dst.dev; 543 schedule_work(&work->work); 544 } 545 } else { 546 out: 547 write_unlock(&neigh->lock); 548 } 549 rcu_read_unlock_bh(); 550 } 551 #else 552 static inline void rt6_probe(struct rt6_info *rt) 553 { 554 } 555 #endif 556 557 /* 558 * Default Router Selection (RFC 2461 6.3.6) 559 */ 560 static inline int rt6_check_dev(struct rt6_info *rt, int oif) 561 { 562 struct net_device *dev = rt->dst.dev; 563 if (!oif || dev->ifindex == oif) 564 return 2; 565 if ((dev->flags & IFF_LOOPBACK) && 566 rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) 567 return 1; 568 return 0; 569 } 570 571 static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt) 572 { 573 struct neighbour *neigh; 574 enum rt6_nud_state ret = RT6_NUD_FAIL_HARD; 575 576 if (rt->rt6i_flags & RTF_NONEXTHOP || 577 !(rt->rt6i_flags & RTF_GATEWAY)) 578 return RT6_NUD_SUCCEED; 579 580 rcu_read_lock_bh(); 581 neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway); 582 if (neigh) { 583 read_lock(&neigh->lock); 584 if (neigh->nud_state & NUD_VALID) 585 ret = RT6_NUD_SUCCEED; 586 #ifdef CONFIG_IPV6_ROUTER_PREF 587 else if (!(neigh->nud_state & NUD_FAILED)) 588 ret = RT6_NUD_SUCCEED; 589 else 590 ret = RT6_NUD_FAIL_PROBE; 591 #endif 592 read_unlock(&neigh->lock); 593 } else { 594 ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ? 595 RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR; 596 } 597 rcu_read_unlock_bh(); 598 599 return ret; 600 } 601 602 static int rt6_score_route(struct rt6_info *rt, int oif, 603 int strict) 604 { 605 int m; 606 607 m = rt6_check_dev(rt, oif); 608 if (!m && (strict & RT6_LOOKUP_F_IFACE)) 609 return RT6_NUD_FAIL_HARD; 610 #ifdef CONFIG_IPV6_ROUTER_PREF 611 m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; 612 #endif 613 if (strict & RT6_LOOKUP_F_REACHABLE) { 614 int n = rt6_check_neigh(rt); 615 if (n < 0) 616 return n; 617 } 618 return m; 619 } 620 621 static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, 622 int *mpri, struct rt6_info *match, 623 bool *do_rr) 624 { 625 int m; 626 bool match_do_rr = false; 627 628 if (rt6_check_expired(rt)) 629 goto out; 630 631 m = rt6_score_route(rt, oif, strict); 632 if (m == RT6_NUD_FAIL_DO_RR) { 633 match_do_rr = true; 634 m = 0; /* lowest valid score */ 635 } else if (m == RT6_NUD_FAIL_HARD) { 636 goto out; 637 } 638 639 if (strict & RT6_LOOKUP_F_REACHABLE) 640 rt6_probe(rt); 641 642 /* note that m can be RT6_NUD_FAIL_PROBE at this point */ 643 if (m > *mpri) { 644 *do_rr = match_do_rr; 645 *mpri = m; 646 match = rt; 647 } 648 out: 649 return match; 650 } 651 652 static struct rt6_info *find_rr_leaf(struct fib6_node *fn, 653 struct rt6_info *rr_head, 654 u32 metric, int oif, int strict, 655 bool *do_rr) 656 { 657 struct rt6_info *rt, *match; 658 int mpri = -1; 659 660 match = NULL; 661 for (rt = rr_head; rt && rt->rt6i_metric == metric; 662 rt = rt->dst.rt6_next) 663 match = find_match(rt, oif, strict, &mpri, match, do_rr); 664 for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; 665 rt = rt->dst.rt6_next) 666 match = find_match(rt, oif, strict, &mpri, match, do_rr); 667 668 return match; 669 } 670 671 static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) 672 { 673 struct rt6_info *match, *rt0; 674 struct net *net; 675 bool do_rr = false; 676 677 rt0 = fn->rr_ptr; 678 if (!rt0) 679 fn->rr_ptr = rt0 = fn->leaf; 680 681 match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict, 682 &do_rr); 683 684 if (do_rr) { 685 struct rt6_info *next = rt0->dst.rt6_next; 686 687 /* no entries matched; do round-robin */ 688 if (!next || next->rt6i_metric != rt0->rt6i_metric) 689 next = fn->leaf; 690 691 if (next != rt0) 692 fn->rr_ptr = next; 693 } 694 695 net = dev_net(rt0->dst.dev); 696 return match ? match : net->ipv6.ip6_null_entry; 697 } 698 699 #ifdef CONFIG_IPV6_ROUTE_INFO 700 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 701 const struct in6_addr *gwaddr) 702 { 703 struct net *net = dev_net(dev); 704 struct route_info *rinfo = (struct route_info *) opt; 705 struct in6_addr prefix_buf, *prefix; 706 unsigned int pref; 707 unsigned long lifetime; 708 struct rt6_info *rt; 709 710 if (len < sizeof(struct route_info)) { 711 return -EINVAL; 712 } 713 714 /* Sanity check for prefix_len and length */ 715 if (rinfo->length > 3) { 716 return -EINVAL; 717 } else if (rinfo->prefix_len > 128) { 718 return -EINVAL; 719 } else if (rinfo->prefix_len > 64) { 720 if (rinfo->length < 2) { 721 return -EINVAL; 722 } 723 } else if (rinfo->prefix_len > 0) { 724 if (rinfo->length < 1) { 725 return -EINVAL; 726 } 727 } 728 729 pref = rinfo->route_pref; 730 if (pref == ICMPV6_ROUTER_PREF_INVALID) 731 return -EINVAL; 732 733 lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); 734 735 if (rinfo->length == 3) 736 prefix = (struct in6_addr *)rinfo->prefix; 737 else { 738 /* this function is safe */ 739 ipv6_addr_prefix(&prefix_buf, 740 (struct in6_addr *)rinfo->prefix, 741 rinfo->prefix_len); 742 prefix = &prefix_buf; 743 } 744 745 if (rinfo->prefix_len == 0) 746 rt = rt6_get_dflt_router(gwaddr, dev); 747 else 748 rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, 749 gwaddr, dev->ifindex); 750 751 if (rt && !lifetime) { 752 ip6_del_rt(rt); 753 rt = NULL; 754 } 755 756 if (!rt && lifetime) 757 rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, 758 pref); 759 else if (rt) 760 rt->rt6i_flags = RTF_ROUTEINFO | 761 (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); 762 763 if (rt) { 764 if (!addrconf_finite_timeout(lifetime)) 765 rt6_clean_expires(rt); 766 else 767 rt6_set_expires(rt, jiffies + HZ * lifetime); 768 769 ip6_rt_put(rt); 770 } 771 return 0; 772 } 773 #endif 774 775 static struct fib6_node* fib6_backtrack(struct fib6_node *fn, 776 struct in6_addr *saddr) 777 { 778 struct fib6_node *pn; 779 while (1) { 780 if (fn->fn_flags & RTN_TL_ROOT) 781 return NULL; 782 pn = fn->parent; 783 if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) 784 fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); 785 else 786 fn = pn; 787 if (fn->fn_flags & RTN_RTINFO) 788 return fn; 789 } 790 } 791 792 static struct rt6_info *ip6_pol_route_lookup(struct net *net, 793 struct fib6_table *table, 794 struct flowi6 *fl6, int flags) 795 { 796 struct fib6_node *fn; 797 struct rt6_info *rt; 798 799 read_lock_bh(&table->tb6_lock); 800 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 801 restart: 802 rt = fn->leaf; 803 rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); 804 if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0) 805 rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags); 806 if (rt == net->ipv6.ip6_null_entry) { 807 fn = fib6_backtrack(fn, &fl6->saddr); 808 if (fn) 809 goto restart; 810 } 811 dst_use(&rt->dst, jiffies); 812 read_unlock_bh(&table->tb6_lock); 813 return rt; 814 815 } 816 817 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 818 int flags) 819 { 820 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); 821 } 822 EXPORT_SYMBOL_GPL(ip6_route_lookup); 823 824 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 825 const struct in6_addr *saddr, int oif, int strict) 826 { 827 struct flowi6 fl6 = { 828 .flowi6_oif = oif, 829 .daddr = *daddr, 830 }; 831 struct dst_entry *dst; 832 int flags = strict ? RT6_LOOKUP_F_IFACE : 0; 833 834 if (saddr) { 835 memcpy(&fl6.saddr, saddr, sizeof(*saddr)); 836 flags |= RT6_LOOKUP_F_HAS_SADDR; 837 } 838 839 dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); 840 if (dst->error == 0) 841 return (struct rt6_info *) dst; 842 843 dst_release(dst); 844 845 return NULL; 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 mx6_config *mxc) 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, mxc); 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 = { .nl_net = dev_net(rt->dst.dev), }; 872 struct mx6_config mxc = { .mx = NULL, }; 873 874 return __ip6_ins_rt(rt, &info, &mxc); 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, *saved_fn; 921 struct rt6_info *rt, *nrt; 922 int strict = 0; 923 int attempts = 3; 924 int err; 925 926 strict |= flags & RT6_LOOKUP_F_IFACE; 927 if (net->ipv6.devconf_all->forwarding == 0) 928 strict |= RT6_LOOKUP_F_REACHABLE; 929 930 redo_fib6_lookup_lock: 931 read_lock_bh(&table->tb6_lock); 932 933 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 934 saved_fn = fn; 935 936 redo_rt6_select: 937 rt = rt6_select(fn, oif, strict); 938 if (rt->rt6i_nsiblings) 939 rt = rt6_multipath_select(rt, fl6, oif, strict); 940 if (rt == net->ipv6.ip6_null_entry) { 941 fn = fib6_backtrack(fn, &fl6->saddr); 942 if (fn) 943 goto redo_rt6_select; 944 else if (strict & RT6_LOOKUP_F_REACHABLE) { 945 /* also consider unreachable route */ 946 strict &= ~RT6_LOOKUP_F_REACHABLE; 947 fn = saved_fn; 948 goto redo_rt6_select; 949 } else { 950 dst_hold(&rt->dst); 951 read_unlock_bh(&table->tb6_lock); 952 goto out2; 953 } 954 } 955 956 dst_hold(&rt->dst); 957 read_unlock_bh(&table->tb6_lock); 958 959 if (rt->rt6i_flags & RTF_CACHE) 960 goto out2; 961 962 if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY))) 963 nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); 964 else if (!(rt->dst.flags & DST_HOST)) 965 nrt = rt6_alloc_clone(rt, &fl6->daddr); 966 else 967 goto out2; 968 969 ip6_rt_put(rt); 970 rt = nrt ? : net->ipv6.ip6_null_entry; 971 972 dst_hold(&rt->dst); 973 if (nrt) { 974 err = ip6_ins_rt(nrt); 975 if (!err) 976 goto out2; 977 } 978 979 if (--attempts <= 0) 980 goto out2; 981 982 /* 983 * Race condition! In the gap, when table->tb6_lock was 984 * released someone could insert this route. Relookup. 985 */ 986 ip6_rt_put(rt); 987 goto redo_fib6_lookup_lock; 988 989 out2: 990 rt->dst.lastuse = jiffies; 991 rt->dst.__use++; 992 993 return rt; 994 } 995 996 static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, 997 struct flowi6 *fl6, int flags) 998 { 999 return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); 1000 } 1001 1002 static struct dst_entry *ip6_route_input_lookup(struct net *net, 1003 struct net_device *dev, 1004 struct flowi6 *fl6, int flags) 1005 { 1006 if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) 1007 flags |= RT6_LOOKUP_F_IFACE; 1008 1009 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); 1010 } 1011 1012 void ip6_route_input(struct sk_buff *skb) 1013 { 1014 const struct ipv6hdr *iph = ipv6_hdr(skb); 1015 struct net *net = dev_net(skb->dev); 1016 int flags = RT6_LOOKUP_F_HAS_SADDR; 1017 struct flowi6 fl6 = { 1018 .flowi6_iif = skb->dev->ifindex, 1019 .daddr = iph->daddr, 1020 .saddr = iph->saddr, 1021 .flowlabel = ip6_flowinfo(iph), 1022 .flowi6_mark = skb->mark, 1023 .flowi6_proto = iph->nexthdr, 1024 }; 1025 1026 skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); 1027 } 1028 1029 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, 1030 struct flowi6 *fl6, int flags) 1031 { 1032 return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); 1033 } 1034 1035 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, 1036 struct flowi6 *fl6) 1037 { 1038 int flags = 0; 1039 1040 fl6->flowi6_iif = LOOPBACK_IFINDEX; 1041 1042 if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) 1043 flags |= RT6_LOOKUP_F_IFACE; 1044 1045 if (!ipv6_addr_any(&fl6->saddr)) 1046 flags |= RT6_LOOKUP_F_HAS_SADDR; 1047 else if (sk) 1048 flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); 1049 1050 return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); 1051 } 1052 EXPORT_SYMBOL(ip6_route_output); 1053 1054 struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) 1055 { 1056 struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; 1057 struct dst_entry *new = NULL; 1058 1059 rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0); 1060 if (rt) { 1061 new = &rt->dst; 1062 1063 memset(new + 1, 0, sizeof(*rt) - sizeof(*new)); 1064 rt6_init_peer(rt, net->ipv6.peers); 1065 1066 new->__use = 1; 1067 new->input = dst_discard; 1068 new->output = dst_discard_sk; 1069 1070 if (dst_metrics_read_only(&ort->dst)) 1071 new->_metrics = ort->dst._metrics; 1072 else 1073 dst_copy_metrics(new, &ort->dst); 1074 rt->rt6i_idev = ort->rt6i_idev; 1075 if (rt->rt6i_idev) 1076 in6_dev_hold(rt->rt6i_idev); 1077 1078 rt->rt6i_gateway = ort->rt6i_gateway; 1079 rt->rt6i_flags = ort->rt6i_flags; 1080 rt->rt6i_metric = 0; 1081 1082 memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); 1083 #ifdef CONFIG_IPV6_SUBTREES 1084 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1085 #endif 1086 1087 dst_free(new); 1088 } 1089 1090 dst_release(dst_orig); 1091 return new ? new : ERR_PTR(-ENOMEM); 1092 } 1093 1094 /* 1095 * Destination cache support functions 1096 */ 1097 1098 static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) 1099 { 1100 struct rt6_info *rt; 1101 1102 rt = (struct rt6_info *) dst; 1103 1104 /* All IPV6 dsts are created with ->obsolete set to the value 1105 * DST_OBSOLETE_FORCE_CHK which forces validation calls down 1106 * into this function always. 1107 */ 1108 if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie)) 1109 return NULL; 1110 1111 if (rt6_check_expired(rt)) 1112 return NULL; 1113 1114 return dst; 1115 } 1116 1117 static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) 1118 { 1119 struct rt6_info *rt = (struct rt6_info *) dst; 1120 1121 if (rt) { 1122 if (rt->rt6i_flags & RTF_CACHE) { 1123 if (rt6_check_expired(rt)) { 1124 ip6_del_rt(rt); 1125 dst = NULL; 1126 } 1127 } else { 1128 dst_release(dst); 1129 dst = NULL; 1130 } 1131 } 1132 return dst; 1133 } 1134 1135 static void ip6_link_failure(struct sk_buff *skb) 1136 { 1137 struct rt6_info *rt; 1138 1139 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); 1140 1141 rt = (struct rt6_info *) skb_dst(skb); 1142 if (rt) { 1143 if (rt->rt6i_flags & RTF_CACHE) { 1144 dst_hold(&rt->dst); 1145 if (ip6_del_rt(rt)) 1146 dst_free(&rt->dst); 1147 } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) { 1148 rt->rt6i_node->fn_sernum = -1; 1149 } 1150 } 1151 } 1152 1153 static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, 1154 struct sk_buff *skb, u32 mtu) 1155 { 1156 struct rt6_info *rt6 = (struct rt6_info *)dst; 1157 1158 dst_confirm(dst); 1159 if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { 1160 struct net *net = dev_net(dst->dev); 1161 1162 rt6->rt6i_flags |= RTF_MODIFIED; 1163 if (mtu < IPV6_MIN_MTU) 1164 mtu = IPV6_MIN_MTU; 1165 1166 dst_metric_set(dst, RTAX_MTU, mtu); 1167 rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); 1168 } 1169 } 1170 1171 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, 1172 int oif, u32 mark) 1173 { 1174 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1175 struct dst_entry *dst; 1176 struct flowi6 fl6; 1177 1178 memset(&fl6, 0, sizeof(fl6)); 1179 fl6.flowi6_oif = oif; 1180 fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark); 1181 fl6.daddr = iph->daddr; 1182 fl6.saddr = iph->saddr; 1183 fl6.flowlabel = ip6_flowinfo(iph); 1184 1185 dst = ip6_route_output(net, NULL, &fl6); 1186 if (!dst->error) 1187 ip6_rt_update_pmtu(dst, NULL, skb, ntohl(mtu)); 1188 dst_release(dst); 1189 } 1190 EXPORT_SYMBOL_GPL(ip6_update_pmtu); 1191 1192 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) 1193 { 1194 ip6_update_pmtu(skb, sock_net(sk), mtu, 1195 sk->sk_bound_dev_if, sk->sk_mark); 1196 } 1197 EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); 1198 1199 /* Handle redirects */ 1200 struct ip6rd_flowi { 1201 struct flowi6 fl6; 1202 struct in6_addr gateway; 1203 }; 1204 1205 static struct rt6_info *__ip6_route_redirect(struct net *net, 1206 struct fib6_table *table, 1207 struct flowi6 *fl6, 1208 int flags) 1209 { 1210 struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; 1211 struct rt6_info *rt; 1212 struct fib6_node *fn; 1213 1214 /* Get the "current" route for this destination and 1215 * check if the redirect has come from approriate router. 1216 * 1217 * RFC 4861 specifies that redirects should only be 1218 * accepted if they come from the nexthop to the target. 1219 * Due to the way the routes are chosen, this notion 1220 * is a bit fuzzy and one might need to check all possible 1221 * routes. 1222 */ 1223 1224 read_lock_bh(&table->tb6_lock); 1225 fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); 1226 restart: 1227 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1228 if (rt6_check_expired(rt)) 1229 continue; 1230 if (rt->dst.error) 1231 break; 1232 if (!(rt->rt6i_flags & RTF_GATEWAY)) 1233 continue; 1234 if (fl6->flowi6_oif != rt->dst.dev->ifindex) 1235 continue; 1236 if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) 1237 continue; 1238 break; 1239 } 1240 1241 if (!rt) 1242 rt = net->ipv6.ip6_null_entry; 1243 else if (rt->dst.error) { 1244 rt = net->ipv6.ip6_null_entry; 1245 goto out; 1246 } 1247 1248 if (rt == net->ipv6.ip6_null_entry) { 1249 fn = fib6_backtrack(fn, &fl6->saddr); 1250 if (fn) 1251 goto restart; 1252 } 1253 1254 out: 1255 dst_hold(&rt->dst); 1256 1257 read_unlock_bh(&table->tb6_lock); 1258 1259 return rt; 1260 }; 1261 1262 static struct dst_entry *ip6_route_redirect(struct net *net, 1263 const struct flowi6 *fl6, 1264 const struct in6_addr *gateway) 1265 { 1266 int flags = RT6_LOOKUP_F_HAS_SADDR; 1267 struct ip6rd_flowi rdfl; 1268 1269 rdfl.fl6 = *fl6; 1270 rdfl.gateway = *gateway; 1271 1272 return fib6_rule_lookup(net, &rdfl.fl6, 1273 flags, __ip6_route_redirect); 1274 } 1275 1276 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) 1277 { 1278 const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; 1279 struct dst_entry *dst; 1280 struct flowi6 fl6; 1281 1282 memset(&fl6, 0, sizeof(fl6)); 1283 fl6.flowi6_iif = LOOPBACK_IFINDEX; 1284 fl6.flowi6_oif = oif; 1285 fl6.flowi6_mark = mark; 1286 fl6.daddr = iph->daddr; 1287 fl6.saddr = iph->saddr; 1288 fl6.flowlabel = ip6_flowinfo(iph); 1289 1290 dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); 1291 rt6_do_redirect(dst, NULL, skb); 1292 dst_release(dst); 1293 } 1294 EXPORT_SYMBOL_GPL(ip6_redirect); 1295 1296 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 1297 u32 mark) 1298 { 1299 const struct ipv6hdr *iph = ipv6_hdr(skb); 1300 const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb); 1301 struct dst_entry *dst; 1302 struct flowi6 fl6; 1303 1304 memset(&fl6, 0, sizeof(fl6)); 1305 fl6.flowi6_iif = LOOPBACK_IFINDEX; 1306 fl6.flowi6_oif = oif; 1307 fl6.flowi6_mark = mark; 1308 fl6.daddr = msg->dest; 1309 fl6.saddr = iph->daddr; 1310 1311 dst = ip6_route_redirect(net, &fl6, &iph->saddr); 1312 rt6_do_redirect(dst, NULL, skb); 1313 dst_release(dst); 1314 } 1315 1316 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk) 1317 { 1318 ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark); 1319 } 1320 EXPORT_SYMBOL_GPL(ip6_sk_redirect); 1321 1322 static unsigned int ip6_default_advmss(const struct dst_entry *dst) 1323 { 1324 struct net_device *dev = dst->dev; 1325 unsigned int mtu = dst_mtu(dst); 1326 struct net *net = dev_net(dev); 1327 1328 mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); 1329 1330 if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) 1331 mtu = net->ipv6.sysctl.ip6_rt_min_advmss; 1332 1333 /* 1334 * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and 1335 * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. 1336 * IPV6_MAXPLEN is also valid and means: "any MSS, 1337 * rely only on pmtu discovery" 1338 */ 1339 if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) 1340 mtu = IPV6_MAXPLEN; 1341 return mtu; 1342 } 1343 1344 static unsigned int ip6_mtu(const struct dst_entry *dst) 1345 { 1346 struct inet6_dev *idev; 1347 unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); 1348 1349 if (mtu) 1350 goto out; 1351 1352 mtu = IPV6_MIN_MTU; 1353 1354 rcu_read_lock(); 1355 idev = __in6_dev_get(dst->dev); 1356 if (idev) 1357 mtu = idev->cnf.mtu6; 1358 rcu_read_unlock(); 1359 1360 out: 1361 return min_t(unsigned int, mtu, IP6_MAX_MTU); 1362 } 1363 1364 static struct dst_entry *icmp6_dst_gc_list; 1365 static DEFINE_SPINLOCK(icmp6_dst_lock); 1366 1367 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 1368 struct flowi6 *fl6) 1369 { 1370 struct dst_entry *dst; 1371 struct rt6_info *rt; 1372 struct inet6_dev *idev = in6_dev_get(dev); 1373 struct net *net = dev_net(dev); 1374 1375 if (unlikely(!idev)) 1376 return ERR_PTR(-ENODEV); 1377 1378 rt = ip6_dst_alloc(net, dev, 0, NULL); 1379 if (unlikely(!rt)) { 1380 in6_dev_put(idev); 1381 dst = ERR_PTR(-ENOMEM); 1382 goto out; 1383 } 1384 1385 rt->dst.flags |= DST_HOST; 1386 rt->dst.output = ip6_output; 1387 atomic_set(&rt->dst.__refcnt, 1); 1388 rt->rt6i_gateway = fl6->daddr; 1389 rt->rt6i_dst.addr = fl6->daddr; 1390 rt->rt6i_dst.plen = 128; 1391 rt->rt6i_idev = idev; 1392 dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0); 1393 1394 spin_lock_bh(&icmp6_dst_lock); 1395 rt->dst.next = icmp6_dst_gc_list; 1396 icmp6_dst_gc_list = &rt->dst; 1397 spin_unlock_bh(&icmp6_dst_lock); 1398 1399 fib6_force_start_gc(net); 1400 1401 dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); 1402 1403 out: 1404 return dst; 1405 } 1406 1407 int icmp6_dst_gc(void) 1408 { 1409 struct dst_entry *dst, **pprev; 1410 int more = 0; 1411 1412 spin_lock_bh(&icmp6_dst_lock); 1413 pprev = &icmp6_dst_gc_list; 1414 1415 while ((dst = *pprev) != NULL) { 1416 if (!atomic_read(&dst->__refcnt)) { 1417 *pprev = dst->next; 1418 dst_free(dst); 1419 } else { 1420 pprev = &dst->next; 1421 ++more; 1422 } 1423 } 1424 1425 spin_unlock_bh(&icmp6_dst_lock); 1426 1427 return more; 1428 } 1429 1430 static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), 1431 void *arg) 1432 { 1433 struct dst_entry *dst, **pprev; 1434 1435 spin_lock_bh(&icmp6_dst_lock); 1436 pprev = &icmp6_dst_gc_list; 1437 while ((dst = *pprev) != NULL) { 1438 struct rt6_info *rt = (struct rt6_info *) dst; 1439 if (func(rt, arg)) { 1440 *pprev = dst->next; 1441 dst_free(dst); 1442 } else { 1443 pprev = &dst->next; 1444 } 1445 } 1446 spin_unlock_bh(&icmp6_dst_lock); 1447 } 1448 1449 static int ip6_dst_gc(struct dst_ops *ops) 1450 { 1451 struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); 1452 int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; 1453 int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; 1454 int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; 1455 int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; 1456 unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; 1457 int entries; 1458 1459 entries = dst_entries_get_fast(ops); 1460 if (time_after(rt_last_gc + rt_min_interval, jiffies) && 1461 entries <= rt_max_size) 1462 goto out; 1463 1464 net->ipv6.ip6_rt_gc_expire++; 1465 fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true); 1466 entries = dst_entries_get_slow(ops); 1467 if (entries < ops->gc_thresh) 1468 net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; 1469 out: 1470 net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; 1471 return entries > rt_max_size; 1472 } 1473 1474 static int ip6_convert_metrics(struct mx6_config *mxc, 1475 const struct fib6_config *cfg) 1476 { 1477 struct nlattr *nla; 1478 int remaining; 1479 u32 *mp; 1480 1481 if (cfg->fc_mx == NULL) 1482 return 0; 1483 1484 mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); 1485 if (unlikely(!mp)) 1486 return -ENOMEM; 1487 1488 nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { 1489 int type = nla_type(nla); 1490 1491 if (type) { 1492 u32 val; 1493 1494 if (unlikely(type > RTAX_MAX)) 1495 goto err; 1496 if (type == RTAX_CC_ALGO) { 1497 char tmp[TCP_CA_NAME_MAX]; 1498 1499 nla_strlcpy(tmp, nla, sizeof(tmp)); 1500 val = tcp_ca_get_key_by_name(tmp); 1501 if (val == TCP_CA_UNSPEC) 1502 goto err; 1503 } else { 1504 val = nla_get_u32(nla); 1505 } 1506 1507 mp[type - 1] = val; 1508 __set_bit(type - 1, mxc->mx_valid); 1509 } 1510 } 1511 1512 mxc->mx = mp; 1513 1514 return 0; 1515 err: 1516 kfree(mp); 1517 return -EINVAL; 1518 } 1519 1520 int ip6_route_add(struct fib6_config *cfg) 1521 { 1522 int err; 1523 struct net *net = cfg->fc_nlinfo.nl_net; 1524 struct rt6_info *rt = NULL; 1525 struct net_device *dev = NULL; 1526 struct inet6_dev *idev = NULL; 1527 struct fib6_table *table; 1528 struct mx6_config mxc = { .mx = NULL, }; 1529 int addr_type; 1530 1531 if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) 1532 return -EINVAL; 1533 #ifndef CONFIG_IPV6_SUBTREES 1534 if (cfg->fc_src_len) 1535 return -EINVAL; 1536 #endif 1537 if (cfg->fc_ifindex) { 1538 err = -ENODEV; 1539 dev = dev_get_by_index(net, cfg->fc_ifindex); 1540 if (!dev) 1541 goto out; 1542 idev = in6_dev_get(dev); 1543 if (!idev) 1544 goto out; 1545 } 1546 1547 if (cfg->fc_metric == 0) 1548 cfg->fc_metric = IP6_RT_PRIO_USER; 1549 1550 err = -ENOBUFS; 1551 if (cfg->fc_nlinfo.nlh && 1552 !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { 1553 table = fib6_get_table(net, cfg->fc_table); 1554 if (!table) { 1555 pr_warn("NLM_F_CREATE should be specified when creating new route\n"); 1556 table = fib6_new_table(net, cfg->fc_table); 1557 } 1558 } else { 1559 table = fib6_new_table(net, cfg->fc_table); 1560 } 1561 1562 if (!table) 1563 goto out; 1564 1565 rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table); 1566 1567 if (!rt) { 1568 err = -ENOMEM; 1569 goto out; 1570 } 1571 1572 if (cfg->fc_flags & RTF_EXPIRES) 1573 rt6_set_expires(rt, jiffies + 1574 clock_t_to_jiffies(cfg->fc_expires)); 1575 else 1576 rt6_clean_expires(rt); 1577 1578 if (cfg->fc_protocol == RTPROT_UNSPEC) 1579 cfg->fc_protocol = RTPROT_BOOT; 1580 rt->rt6i_protocol = cfg->fc_protocol; 1581 1582 addr_type = ipv6_addr_type(&cfg->fc_dst); 1583 1584 if (addr_type & IPV6_ADDR_MULTICAST) 1585 rt->dst.input = ip6_mc_input; 1586 else if (cfg->fc_flags & RTF_LOCAL) 1587 rt->dst.input = ip6_input; 1588 else 1589 rt->dst.input = ip6_forward; 1590 1591 rt->dst.output = ip6_output; 1592 1593 ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); 1594 rt->rt6i_dst.plen = cfg->fc_dst_len; 1595 if (rt->rt6i_dst.plen == 128) { 1596 rt->dst.flags |= DST_HOST; 1597 dst_metrics_set_force_overwrite(&rt->dst); 1598 } 1599 1600 #ifdef CONFIG_IPV6_SUBTREES 1601 ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); 1602 rt->rt6i_src.plen = cfg->fc_src_len; 1603 #endif 1604 1605 rt->rt6i_metric = cfg->fc_metric; 1606 1607 /* We cannot add true routes via loopback here, 1608 they would result in kernel looping; promote them to reject routes 1609 */ 1610 if ((cfg->fc_flags & RTF_REJECT) || 1611 (dev && (dev->flags & IFF_LOOPBACK) && 1612 !(addr_type & IPV6_ADDR_LOOPBACK) && 1613 !(cfg->fc_flags & RTF_LOCAL))) { 1614 /* hold loopback dev/idev if we haven't done so. */ 1615 if (dev != net->loopback_dev) { 1616 if (dev) { 1617 dev_put(dev); 1618 in6_dev_put(idev); 1619 } 1620 dev = net->loopback_dev; 1621 dev_hold(dev); 1622 idev = in6_dev_get(dev); 1623 if (!idev) { 1624 err = -ENODEV; 1625 goto out; 1626 } 1627 } 1628 rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; 1629 switch (cfg->fc_type) { 1630 case RTN_BLACKHOLE: 1631 rt->dst.error = -EINVAL; 1632 rt->dst.output = dst_discard_sk; 1633 rt->dst.input = dst_discard; 1634 break; 1635 case RTN_PROHIBIT: 1636 rt->dst.error = -EACCES; 1637 rt->dst.output = ip6_pkt_prohibit_out; 1638 rt->dst.input = ip6_pkt_prohibit; 1639 break; 1640 case RTN_THROW: 1641 default: 1642 rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN 1643 : -ENETUNREACH; 1644 rt->dst.output = ip6_pkt_discard_out; 1645 rt->dst.input = ip6_pkt_discard; 1646 break; 1647 } 1648 goto install_route; 1649 } 1650 1651 if (cfg->fc_flags & RTF_GATEWAY) { 1652 const struct in6_addr *gw_addr; 1653 int gwa_type; 1654 1655 gw_addr = &cfg->fc_gateway; 1656 rt->rt6i_gateway = *gw_addr; 1657 gwa_type = ipv6_addr_type(gw_addr); 1658 1659 if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { 1660 struct rt6_info *grt; 1661 1662 /* IPv6 strictly inhibits using not link-local 1663 addresses as nexthop address. 1664 Otherwise, router will not able to send redirects. 1665 It is very good, but in some (rare!) circumstances 1666 (SIT, PtP, NBMA NOARP links) it is handy to allow 1667 some exceptions. --ANK 1668 */ 1669 err = -EINVAL; 1670 if (!(gwa_type & IPV6_ADDR_UNICAST)) 1671 goto out; 1672 1673 grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); 1674 1675 err = -EHOSTUNREACH; 1676 if (!grt) 1677 goto out; 1678 if (dev) { 1679 if (dev != grt->dst.dev) { 1680 ip6_rt_put(grt); 1681 goto out; 1682 } 1683 } else { 1684 dev = grt->dst.dev; 1685 idev = grt->rt6i_idev; 1686 dev_hold(dev); 1687 in6_dev_hold(grt->rt6i_idev); 1688 } 1689 if (!(grt->rt6i_flags & RTF_GATEWAY)) 1690 err = 0; 1691 ip6_rt_put(grt); 1692 1693 if (err) 1694 goto out; 1695 } 1696 err = -EINVAL; 1697 if (!dev || (dev->flags & IFF_LOOPBACK)) 1698 goto out; 1699 } 1700 1701 err = -ENODEV; 1702 if (!dev) 1703 goto out; 1704 1705 if (!ipv6_addr_any(&cfg->fc_prefsrc)) { 1706 if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { 1707 err = -EINVAL; 1708 goto out; 1709 } 1710 rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; 1711 rt->rt6i_prefsrc.plen = 128; 1712 } else 1713 rt->rt6i_prefsrc.plen = 0; 1714 1715 rt->rt6i_flags = cfg->fc_flags; 1716 1717 install_route: 1718 rt->dst.dev = dev; 1719 rt->rt6i_idev = idev; 1720 rt->rt6i_table = table; 1721 1722 cfg->fc_nlinfo.nl_net = dev_net(dev); 1723 1724 err = ip6_convert_metrics(&mxc, cfg); 1725 if (err) 1726 goto out; 1727 1728 err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc); 1729 1730 kfree(mxc.mx); 1731 return err; 1732 out: 1733 if (dev) 1734 dev_put(dev); 1735 if (idev) 1736 in6_dev_put(idev); 1737 if (rt) 1738 dst_free(&rt->dst); 1739 return err; 1740 } 1741 1742 static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) 1743 { 1744 int err; 1745 struct fib6_table *table; 1746 struct net *net = dev_net(rt->dst.dev); 1747 1748 if (rt == net->ipv6.ip6_null_entry) { 1749 err = -ENOENT; 1750 goto out; 1751 } 1752 1753 table = rt->rt6i_table; 1754 write_lock_bh(&table->tb6_lock); 1755 err = fib6_del(rt, info); 1756 write_unlock_bh(&table->tb6_lock); 1757 1758 out: 1759 ip6_rt_put(rt); 1760 return err; 1761 } 1762 1763 int ip6_del_rt(struct rt6_info *rt) 1764 { 1765 struct nl_info info = { 1766 .nl_net = dev_net(rt->dst.dev), 1767 }; 1768 return __ip6_del_rt(rt, &info); 1769 } 1770 1771 static int ip6_route_del(struct fib6_config *cfg) 1772 { 1773 struct fib6_table *table; 1774 struct fib6_node *fn; 1775 struct rt6_info *rt; 1776 int err = -ESRCH; 1777 1778 table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); 1779 if (!table) 1780 return err; 1781 1782 read_lock_bh(&table->tb6_lock); 1783 1784 fn = fib6_locate(&table->tb6_root, 1785 &cfg->fc_dst, cfg->fc_dst_len, 1786 &cfg->fc_src, cfg->fc_src_len); 1787 1788 if (fn) { 1789 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1790 if (cfg->fc_ifindex && 1791 (!rt->dst.dev || 1792 rt->dst.dev->ifindex != cfg->fc_ifindex)) 1793 continue; 1794 if (cfg->fc_flags & RTF_GATEWAY && 1795 !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) 1796 continue; 1797 if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) 1798 continue; 1799 dst_hold(&rt->dst); 1800 read_unlock_bh(&table->tb6_lock); 1801 1802 return __ip6_del_rt(rt, &cfg->fc_nlinfo); 1803 } 1804 } 1805 read_unlock_bh(&table->tb6_lock); 1806 1807 return err; 1808 } 1809 1810 static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) 1811 { 1812 struct net *net = dev_net(skb->dev); 1813 struct netevent_redirect netevent; 1814 struct rt6_info *rt, *nrt = NULL; 1815 struct ndisc_options ndopts; 1816 struct inet6_dev *in6_dev; 1817 struct neighbour *neigh; 1818 struct rd_msg *msg; 1819 int optlen, on_link; 1820 u8 *lladdr; 1821 1822 optlen = skb_tail_pointer(skb) - skb_transport_header(skb); 1823 optlen -= sizeof(*msg); 1824 1825 if (optlen < 0) { 1826 net_dbg_ratelimited("rt6_do_redirect: packet too short\n"); 1827 return; 1828 } 1829 1830 msg = (struct rd_msg *)icmp6_hdr(skb); 1831 1832 if (ipv6_addr_is_multicast(&msg->dest)) { 1833 net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n"); 1834 return; 1835 } 1836 1837 on_link = 0; 1838 if (ipv6_addr_equal(&msg->dest, &msg->target)) { 1839 on_link = 1; 1840 } else if (ipv6_addr_type(&msg->target) != 1841 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { 1842 net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n"); 1843 return; 1844 } 1845 1846 in6_dev = __in6_dev_get(skb->dev); 1847 if (!in6_dev) 1848 return; 1849 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) 1850 return; 1851 1852 /* RFC2461 8.1: 1853 * The IP source address of the Redirect MUST be the same as the current 1854 * first-hop router for the specified ICMP Destination Address. 1855 */ 1856 1857 if (!ndisc_parse_options(msg->opt, optlen, &ndopts)) { 1858 net_dbg_ratelimited("rt6_redirect: invalid ND options\n"); 1859 return; 1860 } 1861 1862 lladdr = NULL; 1863 if (ndopts.nd_opts_tgt_lladdr) { 1864 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, 1865 skb->dev); 1866 if (!lladdr) { 1867 net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n"); 1868 return; 1869 } 1870 } 1871 1872 rt = (struct rt6_info *) dst; 1873 if (rt == net->ipv6.ip6_null_entry) { 1874 net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); 1875 return; 1876 } 1877 1878 /* Redirect received -> path was valid. 1879 * Look, redirects are sent only in response to data packets, 1880 * so that this nexthop apparently is reachable. --ANK 1881 */ 1882 dst_confirm(&rt->dst); 1883 1884 neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1); 1885 if (!neigh) 1886 return; 1887 1888 /* 1889 * We have finally decided to accept it. 1890 */ 1891 1892 neigh_update(neigh, lladdr, NUD_STALE, 1893 NEIGH_UPDATE_F_WEAK_OVERRIDE| 1894 NEIGH_UPDATE_F_OVERRIDE| 1895 (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| 1896 NEIGH_UPDATE_F_ISROUTER)) 1897 ); 1898 1899 nrt = ip6_rt_copy(rt, &msg->dest); 1900 if (!nrt) 1901 goto out; 1902 1903 nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; 1904 if (on_link) 1905 nrt->rt6i_flags &= ~RTF_GATEWAY; 1906 1907 nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; 1908 1909 if (ip6_ins_rt(nrt)) 1910 goto out; 1911 1912 netevent.old = &rt->dst; 1913 netevent.new = &nrt->dst; 1914 netevent.daddr = &msg->dest; 1915 netevent.neigh = neigh; 1916 call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); 1917 1918 if (rt->rt6i_flags & RTF_CACHE) { 1919 rt = (struct rt6_info *) dst_clone(&rt->dst); 1920 ip6_del_rt(rt); 1921 } 1922 1923 out: 1924 neigh_release(neigh); 1925 } 1926 1927 /* 1928 * Misc support functions 1929 */ 1930 1931 static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, 1932 const struct in6_addr *dest) 1933 { 1934 struct net *net = dev_net(ort->dst.dev); 1935 struct rt6_info *rt = ip6_dst_alloc(net, ort->dst.dev, 0, 1936 ort->rt6i_table); 1937 1938 if (rt) { 1939 rt->dst.input = ort->dst.input; 1940 rt->dst.output = ort->dst.output; 1941 rt->dst.flags |= DST_HOST; 1942 1943 rt->rt6i_dst.addr = *dest; 1944 rt->rt6i_dst.plen = 128; 1945 dst_copy_metrics(&rt->dst, &ort->dst); 1946 rt->dst.error = ort->dst.error; 1947 rt->rt6i_idev = ort->rt6i_idev; 1948 if (rt->rt6i_idev) 1949 in6_dev_hold(rt->rt6i_idev); 1950 rt->dst.lastuse = jiffies; 1951 1952 if (ort->rt6i_flags & RTF_GATEWAY) 1953 rt->rt6i_gateway = ort->rt6i_gateway; 1954 else 1955 rt->rt6i_gateway = *dest; 1956 rt->rt6i_flags = ort->rt6i_flags; 1957 rt6_set_from(rt, ort); 1958 rt->rt6i_metric = 0; 1959 1960 #ifdef CONFIG_IPV6_SUBTREES 1961 memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); 1962 #endif 1963 memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); 1964 rt->rt6i_table = ort->rt6i_table; 1965 } 1966 return rt; 1967 } 1968 1969 #ifdef CONFIG_IPV6_ROUTE_INFO 1970 static struct rt6_info *rt6_get_route_info(struct net *net, 1971 const struct in6_addr *prefix, int prefixlen, 1972 const struct in6_addr *gwaddr, int ifindex) 1973 { 1974 struct fib6_node *fn; 1975 struct rt6_info *rt = NULL; 1976 struct fib6_table *table; 1977 1978 table = fib6_get_table(net, RT6_TABLE_INFO); 1979 if (!table) 1980 return NULL; 1981 1982 read_lock_bh(&table->tb6_lock); 1983 fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0); 1984 if (!fn) 1985 goto out; 1986 1987 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1988 if (rt->dst.dev->ifindex != ifindex) 1989 continue; 1990 if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) 1991 continue; 1992 if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) 1993 continue; 1994 dst_hold(&rt->dst); 1995 break; 1996 } 1997 out: 1998 read_unlock_bh(&table->tb6_lock); 1999 return rt; 2000 } 2001 2002 static struct rt6_info *rt6_add_route_info(struct net *net, 2003 const struct in6_addr *prefix, int prefixlen, 2004 const struct in6_addr *gwaddr, int ifindex, 2005 unsigned int pref) 2006 { 2007 struct fib6_config cfg = { 2008 .fc_table = RT6_TABLE_INFO, 2009 .fc_metric = IP6_RT_PRIO_USER, 2010 .fc_ifindex = ifindex, 2011 .fc_dst_len = prefixlen, 2012 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | 2013 RTF_UP | RTF_PREF(pref), 2014 .fc_nlinfo.portid = 0, 2015 .fc_nlinfo.nlh = NULL, 2016 .fc_nlinfo.nl_net = net, 2017 }; 2018 2019 cfg.fc_dst = *prefix; 2020 cfg.fc_gateway = *gwaddr; 2021 2022 /* We should treat it as a default route if prefix length is 0. */ 2023 if (!prefixlen) 2024 cfg.fc_flags |= RTF_DEFAULT; 2025 2026 ip6_route_add(&cfg); 2027 2028 return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); 2029 } 2030 #endif 2031 2032 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) 2033 { 2034 struct rt6_info *rt; 2035 struct fib6_table *table; 2036 2037 table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); 2038 if (!table) 2039 return NULL; 2040 2041 read_lock_bh(&table->tb6_lock); 2042 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { 2043 if (dev == rt->dst.dev && 2044 ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && 2045 ipv6_addr_equal(&rt->rt6i_gateway, addr)) 2046 break; 2047 } 2048 if (rt) 2049 dst_hold(&rt->dst); 2050 read_unlock_bh(&table->tb6_lock); 2051 return rt; 2052 } 2053 2054 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 2055 struct net_device *dev, 2056 unsigned int pref) 2057 { 2058 struct fib6_config cfg = { 2059 .fc_table = RT6_TABLE_DFLT, 2060 .fc_metric = IP6_RT_PRIO_USER, 2061 .fc_ifindex = dev->ifindex, 2062 .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | 2063 RTF_UP | RTF_EXPIRES | RTF_PREF(pref), 2064 .fc_nlinfo.portid = 0, 2065 .fc_nlinfo.nlh = NULL, 2066 .fc_nlinfo.nl_net = dev_net(dev), 2067 }; 2068 2069 cfg.fc_gateway = *gwaddr; 2070 2071 ip6_route_add(&cfg); 2072 2073 return rt6_get_dflt_router(gwaddr, dev); 2074 } 2075 2076 void rt6_purge_dflt_routers(struct net *net) 2077 { 2078 struct rt6_info *rt; 2079 struct fib6_table *table; 2080 2081 /* NOTE: Keep consistent with rt6_get_dflt_router */ 2082 table = fib6_get_table(net, RT6_TABLE_DFLT); 2083 if (!table) 2084 return; 2085 2086 restart: 2087 read_lock_bh(&table->tb6_lock); 2088 for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { 2089 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) && 2090 (!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) { 2091 dst_hold(&rt->dst); 2092 read_unlock_bh(&table->tb6_lock); 2093 ip6_del_rt(rt); 2094 goto restart; 2095 } 2096 } 2097 read_unlock_bh(&table->tb6_lock); 2098 } 2099 2100 static void rtmsg_to_fib6_config(struct net *net, 2101 struct in6_rtmsg *rtmsg, 2102 struct fib6_config *cfg) 2103 { 2104 memset(cfg, 0, sizeof(*cfg)); 2105 2106 cfg->fc_table = RT6_TABLE_MAIN; 2107 cfg->fc_ifindex = rtmsg->rtmsg_ifindex; 2108 cfg->fc_metric = rtmsg->rtmsg_metric; 2109 cfg->fc_expires = rtmsg->rtmsg_info; 2110 cfg->fc_dst_len = rtmsg->rtmsg_dst_len; 2111 cfg->fc_src_len = rtmsg->rtmsg_src_len; 2112 cfg->fc_flags = rtmsg->rtmsg_flags; 2113 2114 cfg->fc_nlinfo.nl_net = net; 2115 2116 cfg->fc_dst = rtmsg->rtmsg_dst; 2117 cfg->fc_src = rtmsg->rtmsg_src; 2118 cfg->fc_gateway = rtmsg->rtmsg_gateway; 2119 } 2120 2121 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) 2122 { 2123 struct fib6_config cfg; 2124 struct in6_rtmsg rtmsg; 2125 int err; 2126 2127 switch (cmd) { 2128 case SIOCADDRT: /* Add a route */ 2129 case SIOCDELRT: /* Delete a route */ 2130 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2131 return -EPERM; 2132 err = copy_from_user(&rtmsg, arg, 2133 sizeof(struct in6_rtmsg)); 2134 if (err) 2135 return -EFAULT; 2136 2137 rtmsg_to_fib6_config(net, &rtmsg, &cfg); 2138 2139 rtnl_lock(); 2140 switch (cmd) { 2141 case SIOCADDRT: 2142 err = ip6_route_add(&cfg); 2143 break; 2144 case SIOCDELRT: 2145 err = ip6_route_del(&cfg); 2146 break; 2147 default: 2148 err = -EINVAL; 2149 } 2150 rtnl_unlock(); 2151 2152 return err; 2153 } 2154 2155 return -EINVAL; 2156 } 2157 2158 /* 2159 * Drop the packet on the floor 2160 */ 2161 2162 static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) 2163 { 2164 int type; 2165 struct dst_entry *dst = skb_dst(skb); 2166 switch (ipstats_mib_noroutes) { 2167 case IPSTATS_MIB_INNOROUTES: 2168 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); 2169 if (type == IPV6_ADDR_ANY) { 2170 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2171 IPSTATS_MIB_INADDRERRORS); 2172 break; 2173 } 2174 /* FALLTHROUGH */ 2175 case IPSTATS_MIB_OUTNOROUTES: 2176 IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), 2177 ipstats_mib_noroutes); 2178 break; 2179 } 2180 icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); 2181 kfree_skb(skb); 2182 return 0; 2183 } 2184 2185 static int ip6_pkt_discard(struct sk_buff *skb) 2186 { 2187 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); 2188 } 2189 2190 static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb) 2191 { 2192 skb->dev = skb_dst(skb)->dev; 2193 return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); 2194 } 2195 2196 static int ip6_pkt_prohibit(struct sk_buff *skb) 2197 { 2198 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); 2199 } 2200 2201 static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb) 2202 { 2203 skb->dev = skb_dst(skb)->dev; 2204 return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); 2205 } 2206 2207 /* 2208 * Allocate a dst for local (unicast / anycast) address. 2209 */ 2210 2211 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 2212 const struct in6_addr *addr, 2213 bool anycast) 2214 { 2215 struct net *net = dev_net(idev->dev); 2216 struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev, 2217 DST_NOCOUNT, NULL); 2218 if (!rt) 2219 return ERR_PTR(-ENOMEM); 2220 2221 in6_dev_hold(idev); 2222 2223 rt->dst.flags |= DST_HOST; 2224 rt->dst.input = ip6_input; 2225 rt->dst.output = ip6_output; 2226 rt->rt6i_idev = idev; 2227 2228 rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; 2229 if (anycast) 2230 rt->rt6i_flags |= RTF_ANYCAST; 2231 else 2232 rt->rt6i_flags |= RTF_LOCAL; 2233 2234 rt->rt6i_gateway = *addr; 2235 rt->rt6i_dst.addr = *addr; 2236 rt->rt6i_dst.plen = 128; 2237 rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); 2238 2239 atomic_set(&rt->dst.__refcnt, 1); 2240 2241 return rt; 2242 } 2243 2244 int ip6_route_get_saddr(struct net *net, 2245 struct rt6_info *rt, 2246 const struct in6_addr *daddr, 2247 unsigned int prefs, 2248 struct in6_addr *saddr) 2249 { 2250 struct inet6_dev *idev = ip6_dst_idev((struct dst_entry *)rt); 2251 int err = 0; 2252 if (rt->rt6i_prefsrc.plen) 2253 *saddr = rt->rt6i_prefsrc.addr; 2254 else 2255 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 2256 daddr, prefs, saddr); 2257 return err; 2258 } 2259 2260 /* remove deleted ip from prefsrc entries */ 2261 struct arg_dev_net_ip { 2262 struct net_device *dev; 2263 struct net *net; 2264 struct in6_addr *addr; 2265 }; 2266 2267 static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) 2268 { 2269 struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; 2270 struct net *net = ((struct arg_dev_net_ip *)arg)->net; 2271 struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; 2272 2273 if (((void *)rt->dst.dev == dev || !dev) && 2274 rt != net->ipv6.ip6_null_entry && 2275 ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { 2276 /* remove prefsrc entry */ 2277 rt->rt6i_prefsrc.plen = 0; 2278 } 2279 return 0; 2280 } 2281 2282 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) 2283 { 2284 struct net *net = dev_net(ifp->idev->dev); 2285 struct arg_dev_net_ip adni = { 2286 .dev = ifp->idev->dev, 2287 .net = net, 2288 .addr = &ifp->addr, 2289 }; 2290 fib6_clean_all(net, fib6_remove_prefsrc, &adni); 2291 } 2292 2293 #define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY) 2294 #define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE) 2295 2296 /* Remove routers and update dst entries when gateway turn into host. */ 2297 static int fib6_clean_tohost(struct rt6_info *rt, void *arg) 2298 { 2299 struct in6_addr *gateway = (struct in6_addr *)arg; 2300 2301 if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) || 2302 ((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) && 2303 ipv6_addr_equal(gateway, &rt->rt6i_gateway)) { 2304 return -1; 2305 } 2306 return 0; 2307 } 2308 2309 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway) 2310 { 2311 fib6_clean_all(net, fib6_clean_tohost, gateway); 2312 } 2313 2314 struct arg_dev_net { 2315 struct net_device *dev; 2316 struct net *net; 2317 }; 2318 2319 static int fib6_ifdown(struct rt6_info *rt, void *arg) 2320 { 2321 const struct arg_dev_net *adn = arg; 2322 const struct net_device *dev = adn->dev; 2323 2324 if ((rt->dst.dev == dev || !dev) && 2325 rt != adn->net->ipv6.ip6_null_entry) 2326 return -1; 2327 2328 return 0; 2329 } 2330 2331 void rt6_ifdown(struct net *net, struct net_device *dev) 2332 { 2333 struct arg_dev_net adn = { 2334 .dev = dev, 2335 .net = net, 2336 }; 2337 2338 fib6_clean_all(net, fib6_ifdown, &adn); 2339 icmp6_clean_all(fib6_ifdown, &adn); 2340 } 2341 2342 struct rt6_mtu_change_arg { 2343 struct net_device *dev; 2344 unsigned int mtu; 2345 }; 2346 2347 static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) 2348 { 2349 struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; 2350 struct inet6_dev *idev; 2351 2352 /* In IPv6 pmtu discovery is not optional, 2353 so that RTAX_MTU lock cannot disable it. 2354 We still use this lock to block changes 2355 caused by addrconf/ndisc. 2356 */ 2357 2358 idev = __in6_dev_get(arg->dev); 2359 if (!idev) 2360 return 0; 2361 2362 /* For administrative MTU increase, there is no way to discover 2363 IPv6 PMTU increase, so PMTU increase should be updated here. 2364 Since RFC 1981 doesn't include administrative MTU increase 2365 update PMTU increase is a MUST. (i.e. jumbo frame) 2366 */ 2367 /* 2368 If new MTU is less than route PMTU, this new MTU will be the 2369 lowest MTU in the path, update the route PMTU to reflect PMTU 2370 decreases; if new MTU is greater than route PMTU, and the 2371 old MTU is the lowest MTU in the path, update the route PMTU 2372 to reflect the increase. In this case if the other nodes' MTU 2373 also have the lowest MTU, TOO BIG MESSAGE will be lead to 2374 PMTU discouvery. 2375 */ 2376 if (rt->dst.dev == arg->dev && 2377 !dst_metric_locked(&rt->dst, RTAX_MTU) && 2378 (dst_mtu(&rt->dst) >= arg->mtu || 2379 (dst_mtu(&rt->dst) < arg->mtu && 2380 dst_mtu(&rt->dst) == idev->cnf.mtu6))) { 2381 dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); 2382 } 2383 return 0; 2384 } 2385 2386 void rt6_mtu_change(struct net_device *dev, unsigned int mtu) 2387 { 2388 struct rt6_mtu_change_arg arg = { 2389 .dev = dev, 2390 .mtu = mtu, 2391 }; 2392 2393 fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg); 2394 } 2395 2396 static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { 2397 [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, 2398 [RTA_OIF] = { .type = NLA_U32 }, 2399 [RTA_IIF] = { .type = NLA_U32 }, 2400 [RTA_PRIORITY] = { .type = NLA_U32 }, 2401 [RTA_METRICS] = { .type = NLA_NESTED }, 2402 [RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) }, 2403 }; 2404 2405 static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, 2406 struct fib6_config *cfg) 2407 { 2408 struct rtmsg *rtm; 2409 struct nlattr *tb[RTA_MAX+1]; 2410 int err; 2411 2412 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2413 if (err < 0) 2414 goto errout; 2415 2416 err = -EINVAL; 2417 rtm = nlmsg_data(nlh); 2418 memset(cfg, 0, sizeof(*cfg)); 2419 2420 cfg->fc_table = rtm->rtm_table; 2421 cfg->fc_dst_len = rtm->rtm_dst_len; 2422 cfg->fc_src_len = rtm->rtm_src_len; 2423 cfg->fc_flags = RTF_UP; 2424 cfg->fc_protocol = rtm->rtm_protocol; 2425 cfg->fc_type = rtm->rtm_type; 2426 2427 if (rtm->rtm_type == RTN_UNREACHABLE || 2428 rtm->rtm_type == RTN_BLACKHOLE || 2429 rtm->rtm_type == RTN_PROHIBIT || 2430 rtm->rtm_type == RTN_THROW) 2431 cfg->fc_flags |= RTF_REJECT; 2432 2433 if (rtm->rtm_type == RTN_LOCAL) 2434 cfg->fc_flags |= RTF_LOCAL; 2435 2436 cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid; 2437 cfg->fc_nlinfo.nlh = nlh; 2438 cfg->fc_nlinfo.nl_net = sock_net(skb->sk); 2439 2440 if (tb[RTA_GATEWAY]) { 2441 nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); 2442 cfg->fc_flags |= RTF_GATEWAY; 2443 } 2444 2445 if (tb[RTA_DST]) { 2446 int plen = (rtm->rtm_dst_len + 7) >> 3; 2447 2448 if (nla_len(tb[RTA_DST]) < plen) 2449 goto errout; 2450 2451 nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); 2452 } 2453 2454 if (tb[RTA_SRC]) { 2455 int plen = (rtm->rtm_src_len + 7) >> 3; 2456 2457 if (nla_len(tb[RTA_SRC]) < plen) 2458 goto errout; 2459 2460 nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); 2461 } 2462 2463 if (tb[RTA_PREFSRC]) 2464 nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); 2465 2466 if (tb[RTA_OIF]) 2467 cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); 2468 2469 if (tb[RTA_PRIORITY]) 2470 cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); 2471 2472 if (tb[RTA_METRICS]) { 2473 cfg->fc_mx = nla_data(tb[RTA_METRICS]); 2474 cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); 2475 } 2476 2477 if (tb[RTA_TABLE]) 2478 cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); 2479 2480 if (tb[RTA_MULTIPATH]) { 2481 cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]); 2482 cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]); 2483 } 2484 2485 err = 0; 2486 errout: 2487 return err; 2488 } 2489 2490 static int ip6_route_multipath(struct fib6_config *cfg, int add) 2491 { 2492 struct fib6_config r_cfg; 2493 struct rtnexthop *rtnh; 2494 int remaining; 2495 int attrlen; 2496 int err = 0, last_err = 0; 2497 2498 beginning: 2499 rtnh = (struct rtnexthop *)cfg->fc_mp; 2500 remaining = cfg->fc_mp_len; 2501 2502 /* Parse a Multipath Entry */ 2503 while (rtnh_ok(rtnh, remaining)) { 2504 memcpy(&r_cfg, cfg, sizeof(*cfg)); 2505 if (rtnh->rtnh_ifindex) 2506 r_cfg.fc_ifindex = rtnh->rtnh_ifindex; 2507 2508 attrlen = rtnh_attrlen(rtnh); 2509 if (attrlen > 0) { 2510 struct nlattr *nla, *attrs = rtnh_attrs(rtnh); 2511 2512 nla = nla_find(attrs, attrlen, RTA_GATEWAY); 2513 if (nla) { 2514 nla_memcpy(&r_cfg.fc_gateway, nla, 16); 2515 r_cfg.fc_flags |= RTF_GATEWAY; 2516 } 2517 } 2518 err = add ? ip6_route_add(&r_cfg) : ip6_route_del(&r_cfg); 2519 if (err) { 2520 last_err = err; 2521 /* If we are trying to remove a route, do not stop the 2522 * loop when ip6_route_del() fails (because next hop is 2523 * already gone), we should try to remove all next hops. 2524 */ 2525 if (add) { 2526 /* If add fails, we should try to delete all 2527 * next hops that have been already added. 2528 */ 2529 add = 0; 2530 goto beginning; 2531 } 2532 } 2533 /* Because each route is added like a single route we remove 2534 * this flag after the first nexthop (if there is a collision, 2535 * we have already fail to add the first nexthop: 2536 * fib6_add_rt2node() has reject it). 2537 */ 2538 cfg->fc_nlinfo.nlh->nlmsg_flags &= ~NLM_F_EXCL; 2539 rtnh = rtnh_next(rtnh, &remaining); 2540 } 2541 2542 return last_err; 2543 } 2544 2545 static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) 2546 { 2547 struct fib6_config cfg; 2548 int err; 2549 2550 err = rtm_to_fib6_config(skb, nlh, &cfg); 2551 if (err < 0) 2552 return err; 2553 2554 if (cfg.fc_mp) 2555 return ip6_route_multipath(&cfg, 0); 2556 else 2557 return ip6_route_del(&cfg); 2558 } 2559 2560 static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) 2561 { 2562 struct fib6_config cfg; 2563 int err; 2564 2565 err = rtm_to_fib6_config(skb, nlh, &cfg); 2566 if (err < 0) 2567 return err; 2568 2569 if (cfg.fc_mp) 2570 return ip6_route_multipath(&cfg, 1); 2571 else 2572 return ip6_route_add(&cfg); 2573 } 2574 2575 static inline size_t rt6_nlmsg_size(void) 2576 { 2577 return NLMSG_ALIGN(sizeof(struct rtmsg)) 2578 + nla_total_size(16) /* RTA_SRC */ 2579 + nla_total_size(16) /* RTA_DST */ 2580 + nla_total_size(16) /* RTA_GATEWAY */ 2581 + nla_total_size(16) /* RTA_PREFSRC */ 2582 + nla_total_size(4) /* RTA_TABLE */ 2583 + nla_total_size(4) /* RTA_IIF */ 2584 + nla_total_size(4) /* RTA_OIF */ 2585 + nla_total_size(4) /* RTA_PRIORITY */ 2586 + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ 2587 + nla_total_size(sizeof(struct rta_cacheinfo)) 2588 + nla_total_size(TCP_CA_NAME_MAX); /* RTAX_CC_ALGO */ 2589 } 2590 2591 static int rt6_fill_node(struct net *net, 2592 struct sk_buff *skb, struct rt6_info *rt, 2593 struct in6_addr *dst, struct in6_addr *src, 2594 int iif, int type, u32 portid, u32 seq, 2595 int prefix, int nowait, unsigned int flags) 2596 { 2597 struct rtmsg *rtm; 2598 struct nlmsghdr *nlh; 2599 long expires; 2600 u32 table; 2601 2602 if (prefix) { /* user wants prefix routes only */ 2603 if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { 2604 /* success since this is not a prefix route */ 2605 return 1; 2606 } 2607 } 2608 2609 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags); 2610 if (!nlh) 2611 return -EMSGSIZE; 2612 2613 rtm = nlmsg_data(nlh); 2614 rtm->rtm_family = AF_INET6; 2615 rtm->rtm_dst_len = rt->rt6i_dst.plen; 2616 rtm->rtm_src_len = rt->rt6i_src.plen; 2617 rtm->rtm_tos = 0; 2618 if (rt->rt6i_table) 2619 table = rt->rt6i_table->tb6_id; 2620 else 2621 table = RT6_TABLE_UNSPEC; 2622 rtm->rtm_table = table; 2623 if (nla_put_u32(skb, RTA_TABLE, table)) 2624 goto nla_put_failure; 2625 if (rt->rt6i_flags & RTF_REJECT) { 2626 switch (rt->dst.error) { 2627 case -EINVAL: 2628 rtm->rtm_type = RTN_BLACKHOLE; 2629 break; 2630 case -EACCES: 2631 rtm->rtm_type = RTN_PROHIBIT; 2632 break; 2633 case -EAGAIN: 2634 rtm->rtm_type = RTN_THROW; 2635 break; 2636 default: 2637 rtm->rtm_type = RTN_UNREACHABLE; 2638 break; 2639 } 2640 } 2641 else if (rt->rt6i_flags & RTF_LOCAL) 2642 rtm->rtm_type = RTN_LOCAL; 2643 else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) 2644 rtm->rtm_type = RTN_LOCAL; 2645 else 2646 rtm->rtm_type = RTN_UNICAST; 2647 rtm->rtm_flags = 0; 2648 rtm->rtm_scope = RT_SCOPE_UNIVERSE; 2649 rtm->rtm_protocol = rt->rt6i_protocol; 2650 if (rt->rt6i_flags & RTF_DYNAMIC) 2651 rtm->rtm_protocol = RTPROT_REDIRECT; 2652 else if (rt->rt6i_flags & RTF_ADDRCONF) { 2653 if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO)) 2654 rtm->rtm_protocol = RTPROT_RA; 2655 else 2656 rtm->rtm_protocol = RTPROT_KERNEL; 2657 } 2658 2659 if (rt->rt6i_flags & RTF_CACHE) 2660 rtm->rtm_flags |= RTM_F_CLONED; 2661 2662 if (dst) { 2663 if (nla_put(skb, RTA_DST, 16, dst)) 2664 goto nla_put_failure; 2665 rtm->rtm_dst_len = 128; 2666 } else if (rtm->rtm_dst_len) 2667 if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) 2668 goto nla_put_failure; 2669 #ifdef CONFIG_IPV6_SUBTREES 2670 if (src) { 2671 if (nla_put(skb, RTA_SRC, 16, src)) 2672 goto nla_put_failure; 2673 rtm->rtm_src_len = 128; 2674 } else if (rtm->rtm_src_len && 2675 nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) 2676 goto nla_put_failure; 2677 #endif 2678 if (iif) { 2679 #ifdef CONFIG_IPV6_MROUTE 2680 if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { 2681 int err = ip6mr_get_route(net, skb, rtm, nowait); 2682 if (err <= 0) { 2683 if (!nowait) { 2684 if (err == 0) 2685 return 0; 2686 goto nla_put_failure; 2687 } else { 2688 if (err == -EMSGSIZE) 2689 goto nla_put_failure; 2690 } 2691 } 2692 } else 2693 #endif 2694 if (nla_put_u32(skb, RTA_IIF, iif)) 2695 goto nla_put_failure; 2696 } else if (dst) { 2697 struct in6_addr saddr_buf; 2698 if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && 2699 nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2700 goto nla_put_failure; 2701 } 2702 2703 if (rt->rt6i_prefsrc.plen) { 2704 struct in6_addr saddr_buf; 2705 saddr_buf = rt->rt6i_prefsrc.addr; 2706 if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) 2707 goto nla_put_failure; 2708 } 2709 2710 if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) 2711 goto nla_put_failure; 2712 2713 if (rt->rt6i_flags & RTF_GATEWAY) { 2714 if (nla_put(skb, RTA_GATEWAY, 16, &rt->rt6i_gateway) < 0) 2715 goto nla_put_failure; 2716 } 2717 2718 if (rt->dst.dev && 2719 nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) 2720 goto nla_put_failure; 2721 if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) 2722 goto nla_put_failure; 2723 2724 expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0; 2725 2726 if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0) 2727 goto nla_put_failure; 2728 2729 nlmsg_end(skb, nlh); 2730 return 0; 2731 2732 nla_put_failure: 2733 nlmsg_cancel(skb, nlh); 2734 return -EMSGSIZE; 2735 } 2736 2737 int rt6_dump_route(struct rt6_info *rt, void *p_arg) 2738 { 2739 struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; 2740 int prefix; 2741 2742 if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { 2743 struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); 2744 prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; 2745 } else 2746 prefix = 0; 2747 2748 return rt6_fill_node(arg->net, 2749 arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, 2750 NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq, 2751 prefix, 0, NLM_F_MULTI); 2752 } 2753 2754 static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh) 2755 { 2756 struct net *net = sock_net(in_skb->sk); 2757 struct nlattr *tb[RTA_MAX+1]; 2758 struct rt6_info *rt; 2759 struct sk_buff *skb; 2760 struct rtmsg *rtm; 2761 struct flowi6 fl6; 2762 int err, iif = 0, oif = 0; 2763 2764 err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); 2765 if (err < 0) 2766 goto errout; 2767 2768 err = -EINVAL; 2769 memset(&fl6, 0, sizeof(fl6)); 2770 2771 if (tb[RTA_SRC]) { 2772 if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) 2773 goto errout; 2774 2775 fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); 2776 } 2777 2778 if (tb[RTA_DST]) { 2779 if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) 2780 goto errout; 2781 2782 fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); 2783 } 2784 2785 if (tb[RTA_IIF]) 2786 iif = nla_get_u32(tb[RTA_IIF]); 2787 2788 if (tb[RTA_OIF]) 2789 oif = nla_get_u32(tb[RTA_OIF]); 2790 2791 if (tb[RTA_MARK]) 2792 fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]); 2793 2794 if (iif) { 2795 struct net_device *dev; 2796 int flags = 0; 2797 2798 dev = __dev_get_by_index(net, iif); 2799 if (!dev) { 2800 err = -ENODEV; 2801 goto errout; 2802 } 2803 2804 fl6.flowi6_iif = iif; 2805 2806 if (!ipv6_addr_any(&fl6.saddr)) 2807 flags |= RT6_LOOKUP_F_HAS_SADDR; 2808 2809 rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, 2810 flags); 2811 } else { 2812 fl6.flowi6_oif = oif; 2813 2814 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); 2815 } 2816 2817 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); 2818 if (!skb) { 2819 ip6_rt_put(rt); 2820 err = -ENOBUFS; 2821 goto errout; 2822 } 2823 2824 /* Reserve room for dummy headers, this skb can pass 2825 through good chunk of routing engine. 2826 */ 2827 skb_reset_mac_header(skb); 2828 skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); 2829 2830 skb_dst_set(skb, &rt->dst); 2831 2832 err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, 2833 RTM_NEWROUTE, NETLINK_CB(in_skb).portid, 2834 nlh->nlmsg_seq, 0, 0, 0); 2835 if (err < 0) { 2836 kfree_skb(skb); 2837 goto errout; 2838 } 2839 2840 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 2841 errout: 2842 return err; 2843 } 2844 2845 void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) 2846 { 2847 struct sk_buff *skb; 2848 struct net *net = info->nl_net; 2849 u32 seq; 2850 int err; 2851 2852 err = -ENOBUFS; 2853 seq = info->nlh ? info->nlh->nlmsg_seq : 0; 2854 2855 skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); 2856 if (!skb) 2857 goto errout; 2858 2859 err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, 2860 event, info->portid, seq, 0, 0, 0); 2861 if (err < 0) { 2862 /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ 2863 WARN_ON(err == -EMSGSIZE); 2864 kfree_skb(skb); 2865 goto errout; 2866 } 2867 rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE, 2868 info->nlh, gfp_any()); 2869 return; 2870 errout: 2871 if (err < 0) 2872 rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); 2873 } 2874 2875 static int ip6_route_dev_notify(struct notifier_block *this, 2876 unsigned long event, void *ptr) 2877 { 2878 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 2879 struct net *net = dev_net(dev); 2880 2881 if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { 2882 net->ipv6.ip6_null_entry->dst.dev = dev; 2883 net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); 2884 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 2885 net->ipv6.ip6_prohibit_entry->dst.dev = dev; 2886 net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); 2887 net->ipv6.ip6_blk_hole_entry->dst.dev = dev; 2888 net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); 2889 #endif 2890 } 2891 2892 return NOTIFY_OK; 2893 } 2894 2895 /* 2896 * /proc 2897 */ 2898 2899 #ifdef CONFIG_PROC_FS 2900 2901 static const struct file_operations ipv6_route_proc_fops = { 2902 .owner = THIS_MODULE, 2903 .open = ipv6_route_open, 2904 .read = seq_read, 2905 .llseek = seq_lseek, 2906 .release = seq_release_net, 2907 }; 2908 2909 static int rt6_stats_seq_show(struct seq_file *seq, void *v) 2910 { 2911 struct net *net = (struct net *)seq->private; 2912 seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", 2913 net->ipv6.rt6_stats->fib_nodes, 2914 net->ipv6.rt6_stats->fib_route_nodes, 2915 net->ipv6.rt6_stats->fib_rt_alloc, 2916 net->ipv6.rt6_stats->fib_rt_entries, 2917 net->ipv6.rt6_stats->fib_rt_cache, 2918 dst_entries_get_slow(&net->ipv6.ip6_dst_ops), 2919 net->ipv6.rt6_stats->fib_discarded_routes); 2920 2921 return 0; 2922 } 2923 2924 static int rt6_stats_seq_open(struct inode *inode, struct file *file) 2925 { 2926 return single_open_net(inode, file, rt6_stats_seq_show); 2927 } 2928 2929 static const struct file_operations rt6_stats_seq_fops = { 2930 .owner = THIS_MODULE, 2931 .open = rt6_stats_seq_open, 2932 .read = seq_read, 2933 .llseek = seq_lseek, 2934 .release = single_release_net, 2935 }; 2936 #endif /* CONFIG_PROC_FS */ 2937 2938 #ifdef CONFIG_SYSCTL 2939 2940 static 2941 int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write, 2942 void __user *buffer, size_t *lenp, loff_t *ppos) 2943 { 2944 struct net *net; 2945 int delay; 2946 if (!write) 2947 return -EINVAL; 2948 2949 net = (struct net *)ctl->extra1; 2950 delay = net->ipv6.sysctl.flush_delay; 2951 proc_dointvec(ctl, write, buffer, lenp, ppos); 2952 fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0); 2953 return 0; 2954 } 2955 2956 struct ctl_table ipv6_route_table_template[] = { 2957 { 2958 .procname = "flush", 2959 .data = &init_net.ipv6.sysctl.flush_delay, 2960 .maxlen = sizeof(int), 2961 .mode = 0200, 2962 .proc_handler = ipv6_sysctl_rtcache_flush 2963 }, 2964 { 2965 .procname = "gc_thresh", 2966 .data = &ip6_dst_ops_template.gc_thresh, 2967 .maxlen = sizeof(int), 2968 .mode = 0644, 2969 .proc_handler = proc_dointvec, 2970 }, 2971 { 2972 .procname = "max_size", 2973 .data = &init_net.ipv6.sysctl.ip6_rt_max_size, 2974 .maxlen = sizeof(int), 2975 .mode = 0644, 2976 .proc_handler = proc_dointvec, 2977 }, 2978 { 2979 .procname = "gc_min_interval", 2980 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 2981 .maxlen = sizeof(int), 2982 .mode = 0644, 2983 .proc_handler = proc_dointvec_jiffies, 2984 }, 2985 { 2986 .procname = "gc_timeout", 2987 .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, 2988 .maxlen = sizeof(int), 2989 .mode = 0644, 2990 .proc_handler = proc_dointvec_jiffies, 2991 }, 2992 { 2993 .procname = "gc_interval", 2994 .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, 2995 .maxlen = sizeof(int), 2996 .mode = 0644, 2997 .proc_handler = proc_dointvec_jiffies, 2998 }, 2999 { 3000 .procname = "gc_elasticity", 3001 .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, 3002 .maxlen = sizeof(int), 3003 .mode = 0644, 3004 .proc_handler = proc_dointvec, 3005 }, 3006 { 3007 .procname = "mtu_expires", 3008 .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, 3009 .maxlen = sizeof(int), 3010 .mode = 0644, 3011 .proc_handler = proc_dointvec_jiffies, 3012 }, 3013 { 3014 .procname = "min_adv_mss", 3015 .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, 3016 .maxlen = sizeof(int), 3017 .mode = 0644, 3018 .proc_handler = proc_dointvec, 3019 }, 3020 { 3021 .procname = "gc_min_interval_ms", 3022 .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, 3023 .maxlen = sizeof(int), 3024 .mode = 0644, 3025 .proc_handler = proc_dointvec_ms_jiffies, 3026 }, 3027 { } 3028 }; 3029 3030 struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) 3031 { 3032 struct ctl_table *table; 3033 3034 table = kmemdup(ipv6_route_table_template, 3035 sizeof(ipv6_route_table_template), 3036 GFP_KERNEL); 3037 3038 if (table) { 3039 table[0].data = &net->ipv6.sysctl.flush_delay; 3040 table[0].extra1 = net; 3041 table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; 3042 table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; 3043 table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 3044 table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; 3045 table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; 3046 table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; 3047 table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; 3048 table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; 3049 table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; 3050 3051 /* Don't export sysctls to unprivileged users */ 3052 if (net->user_ns != &init_user_ns) 3053 table[0].procname = NULL; 3054 } 3055 3056 return table; 3057 } 3058 #endif 3059 3060 static int __net_init ip6_route_net_init(struct net *net) 3061 { 3062 int ret = -ENOMEM; 3063 3064 memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, 3065 sizeof(net->ipv6.ip6_dst_ops)); 3066 3067 if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) 3068 goto out_ip6_dst_ops; 3069 3070 net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, 3071 sizeof(*net->ipv6.ip6_null_entry), 3072 GFP_KERNEL); 3073 if (!net->ipv6.ip6_null_entry) 3074 goto out_ip6_dst_entries; 3075 net->ipv6.ip6_null_entry->dst.path = 3076 (struct dst_entry *)net->ipv6.ip6_null_entry; 3077 net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3078 dst_init_metrics(&net->ipv6.ip6_null_entry->dst, 3079 ip6_template_metrics, true); 3080 3081 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3082 net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, 3083 sizeof(*net->ipv6.ip6_prohibit_entry), 3084 GFP_KERNEL); 3085 if (!net->ipv6.ip6_prohibit_entry) 3086 goto out_ip6_null_entry; 3087 net->ipv6.ip6_prohibit_entry->dst.path = 3088 (struct dst_entry *)net->ipv6.ip6_prohibit_entry; 3089 net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3090 dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, 3091 ip6_template_metrics, true); 3092 3093 net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, 3094 sizeof(*net->ipv6.ip6_blk_hole_entry), 3095 GFP_KERNEL); 3096 if (!net->ipv6.ip6_blk_hole_entry) 3097 goto out_ip6_prohibit_entry; 3098 net->ipv6.ip6_blk_hole_entry->dst.path = 3099 (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; 3100 net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; 3101 dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, 3102 ip6_template_metrics, true); 3103 #endif 3104 3105 net->ipv6.sysctl.flush_delay = 0; 3106 net->ipv6.sysctl.ip6_rt_max_size = 4096; 3107 net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; 3108 net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; 3109 net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; 3110 net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; 3111 net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; 3112 net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; 3113 3114 net->ipv6.ip6_rt_gc_expire = 30*HZ; 3115 3116 ret = 0; 3117 out: 3118 return ret; 3119 3120 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3121 out_ip6_prohibit_entry: 3122 kfree(net->ipv6.ip6_prohibit_entry); 3123 out_ip6_null_entry: 3124 kfree(net->ipv6.ip6_null_entry); 3125 #endif 3126 out_ip6_dst_entries: 3127 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3128 out_ip6_dst_ops: 3129 goto out; 3130 } 3131 3132 static void __net_exit ip6_route_net_exit(struct net *net) 3133 { 3134 kfree(net->ipv6.ip6_null_entry); 3135 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3136 kfree(net->ipv6.ip6_prohibit_entry); 3137 kfree(net->ipv6.ip6_blk_hole_entry); 3138 #endif 3139 dst_entries_destroy(&net->ipv6.ip6_dst_ops); 3140 } 3141 3142 static int __net_init ip6_route_net_init_late(struct net *net) 3143 { 3144 #ifdef CONFIG_PROC_FS 3145 proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops); 3146 proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops); 3147 #endif 3148 return 0; 3149 } 3150 3151 static void __net_exit ip6_route_net_exit_late(struct net *net) 3152 { 3153 #ifdef CONFIG_PROC_FS 3154 remove_proc_entry("ipv6_route", net->proc_net); 3155 remove_proc_entry("rt6_stats", net->proc_net); 3156 #endif 3157 } 3158 3159 static struct pernet_operations ip6_route_net_ops = { 3160 .init = ip6_route_net_init, 3161 .exit = ip6_route_net_exit, 3162 }; 3163 3164 static int __net_init ipv6_inetpeer_init(struct net *net) 3165 { 3166 struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); 3167 3168 if (!bp) 3169 return -ENOMEM; 3170 inet_peer_base_init(bp); 3171 net->ipv6.peers = bp; 3172 return 0; 3173 } 3174 3175 static void __net_exit ipv6_inetpeer_exit(struct net *net) 3176 { 3177 struct inet_peer_base *bp = net->ipv6.peers; 3178 3179 net->ipv6.peers = NULL; 3180 inetpeer_invalidate_tree(bp); 3181 kfree(bp); 3182 } 3183 3184 static struct pernet_operations ipv6_inetpeer_ops = { 3185 .init = ipv6_inetpeer_init, 3186 .exit = ipv6_inetpeer_exit, 3187 }; 3188 3189 static struct pernet_operations ip6_route_net_late_ops = { 3190 .init = ip6_route_net_init_late, 3191 .exit = ip6_route_net_exit_late, 3192 }; 3193 3194 static struct notifier_block ip6_route_dev_notifier = { 3195 .notifier_call = ip6_route_dev_notify, 3196 .priority = 0, 3197 }; 3198 3199 int __init ip6_route_init(void) 3200 { 3201 int ret; 3202 3203 ret = -ENOMEM; 3204 ip6_dst_ops_template.kmem_cachep = 3205 kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, 3206 SLAB_HWCACHE_ALIGN, NULL); 3207 if (!ip6_dst_ops_template.kmem_cachep) 3208 goto out; 3209 3210 ret = dst_entries_init(&ip6_dst_blackhole_ops); 3211 if (ret) 3212 goto out_kmem_cache; 3213 3214 ret = register_pernet_subsys(&ipv6_inetpeer_ops); 3215 if (ret) 3216 goto out_dst_entries; 3217 3218 ret = register_pernet_subsys(&ip6_route_net_ops); 3219 if (ret) 3220 goto out_register_inetpeer; 3221 3222 ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; 3223 3224 /* Registering of the loopback is done before this portion of code, 3225 * the loopback reference in rt6_info will not be taken, do it 3226 * manually for init_net */ 3227 init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; 3228 init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3229 #ifdef CONFIG_IPV6_MULTIPLE_TABLES 3230 init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; 3231 init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3232 init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; 3233 init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); 3234 #endif 3235 ret = fib6_init(); 3236 if (ret) 3237 goto out_register_subsys; 3238 3239 ret = xfrm6_init(); 3240 if (ret) 3241 goto out_fib6_init; 3242 3243 ret = fib6_rules_init(); 3244 if (ret) 3245 goto xfrm6_init; 3246 3247 ret = register_pernet_subsys(&ip6_route_net_late_ops); 3248 if (ret) 3249 goto fib6_rules_init; 3250 3251 ret = -ENOBUFS; 3252 if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || 3253 __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || 3254 __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) 3255 goto out_register_late_subsys; 3256 3257 ret = register_netdevice_notifier(&ip6_route_dev_notifier); 3258 if (ret) 3259 goto out_register_late_subsys; 3260 3261 out: 3262 return ret; 3263 3264 out_register_late_subsys: 3265 unregister_pernet_subsys(&ip6_route_net_late_ops); 3266 fib6_rules_init: 3267 fib6_rules_cleanup(); 3268 xfrm6_init: 3269 xfrm6_fini(); 3270 out_fib6_init: 3271 fib6_gc_cleanup(); 3272 out_register_subsys: 3273 unregister_pernet_subsys(&ip6_route_net_ops); 3274 out_register_inetpeer: 3275 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3276 out_dst_entries: 3277 dst_entries_destroy(&ip6_dst_blackhole_ops); 3278 out_kmem_cache: 3279 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3280 goto out; 3281 } 3282 3283 void ip6_route_cleanup(void) 3284 { 3285 unregister_netdevice_notifier(&ip6_route_dev_notifier); 3286 unregister_pernet_subsys(&ip6_route_net_late_ops); 3287 fib6_rules_cleanup(); 3288 xfrm6_fini(); 3289 fib6_gc_cleanup(); 3290 unregister_pernet_subsys(&ipv6_inetpeer_ops); 3291 unregister_pernet_subsys(&ip6_route_net_ops); 3292 dst_entries_destroy(&ip6_dst_blackhole_ops); 3293 kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); 3294 } 3295