| 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 | |
| 61 | #include <asm/uaccess.h> |
| 62 | |
| 63 | #ifdef CONFIG_SYSCTL |
| 64 | #include <linux/sysctl.h> |
| 65 | #endif |
| 66 | |
| 67 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
| 68 | const struct in6_addr *dest); |
| 69 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
| 70 | static unsigned int ip6_default_advmss(const struct dst_entry *dst); |
| 71 | static unsigned int ip6_mtu(const struct dst_entry *dst); |
| 72 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
| 73 | static void ip6_dst_destroy(struct dst_entry *); |
| 74 | static void ip6_dst_ifdown(struct dst_entry *, |
| 75 | struct net_device *dev, int how); |
| 76 | static int ip6_dst_gc(struct dst_ops *ops); |
| 77 | |
| 78 | static int ip6_pkt_discard(struct sk_buff *skb); |
| 79 | static int ip6_pkt_discard_out(struct sk_buff *skb); |
| 80 | static void ip6_link_failure(struct sk_buff *skb); |
| 81 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 82 | |
| 83 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 84 | static struct rt6_info *rt6_add_route_info(struct net *net, |
| 85 | const struct in6_addr *prefix, int prefixlen, |
| 86 | const struct in6_addr *gwaddr, int ifindex, |
| 87 | unsigned int pref); |
| 88 | static struct rt6_info *rt6_get_route_info(struct net *net, |
| 89 | const struct in6_addr *prefix, int prefixlen, |
| 90 | const struct in6_addr *gwaddr, int ifindex); |
| 91 | #endif |
| 92 | |
| 93 | static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old) |
| 94 | { |
| 95 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 96 | struct inet_peer *peer; |
| 97 | u32 *p = NULL; |
| 98 | |
| 99 | if (!(rt->dst.flags & DST_HOST)) |
| 100 | return NULL; |
| 101 | |
| 102 | if (!rt->rt6i_peer) |
| 103 | rt6_bind_peer(rt, 1); |
| 104 | |
| 105 | peer = rt->rt6i_peer; |
| 106 | if (peer) { |
| 107 | u32 *old_p = __DST_METRICS_PTR(old); |
| 108 | unsigned long prev, new; |
| 109 | |
| 110 | p = peer->metrics; |
| 111 | if (inet_metrics_new(peer)) |
| 112 | memcpy(p, old_p, sizeof(u32) * RTAX_MAX); |
| 113 | |
| 114 | new = (unsigned long) p; |
| 115 | prev = cmpxchg(&dst->_metrics, old, new); |
| 116 | |
| 117 | if (prev != old) { |
| 118 | p = __DST_METRICS_PTR(prev); |
| 119 | if (prev & DST_METRICS_READ_ONLY) |
| 120 | p = NULL; |
| 121 | } |
| 122 | } |
| 123 | return p; |
| 124 | } |
| 125 | |
| 126 | static inline const void *choose_neigh_daddr(struct rt6_info *rt, const void *daddr) |
| 127 | { |
| 128 | struct in6_addr *p = &rt->rt6i_gateway; |
| 129 | |
| 130 | if (!ipv6_addr_any(p)) |
| 131 | return (const void *) p; |
| 132 | return daddr; |
| 133 | } |
| 134 | |
| 135 | static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst, const void *daddr) |
| 136 | { |
| 137 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 138 | struct neighbour *n; |
| 139 | |
| 140 | daddr = choose_neigh_daddr(rt, daddr); |
| 141 | n = __ipv6_neigh_lookup(&nd_tbl, dst->dev, daddr); |
| 142 | if (n) |
| 143 | return n; |
| 144 | return neigh_create(&nd_tbl, daddr, dst->dev); |
| 145 | } |
| 146 | |
| 147 | static int rt6_bind_neighbour(struct rt6_info *rt, struct net_device *dev) |
| 148 | { |
| 149 | struct neighbour *n = __ipv6_neigh_lookup(&nd_tbl, dev, &rt->rt6i_gateway); |
| 150 | if (!n) { |
| 151 | n = neigh_create(&nd_tbl, &rt->rt6i_gateway, dev); |
| 152 | if (IS_ERR(n)) |
| 153 | return PTR_ERR(n); |
| 154 | } |
| 155 | dst_set_neighbour(&rt->dst, n); |
| 156 | |
| 157 | return 0; |
| 158 | } |
| 159 | |
| 160 | static struct dst_ops ip6_dst_ops_template = { |
| 161 | .family = AF_INET6, |
| 162 | .protocol = cpu_to_be16(ETH_P_IPV6), |
| 163 | .gc = ip6_dst_gc, |
| 164 | .gc_thresh = 1024, |
| 165 | .check = ip6_dst_check, |
| 166 | .default_advmss = ip6_default_advmss, |
| 167 | .mtu = ip6_mtu, |
| 168 | .cow_metrics = ipv6_cow_metrics, |
| 169 | .destroy = ip6_dst_destroy, |
| 170 | .ifdown = ip6_dst_ifdown, |
| 171 | .negative_advice = ip6_negative_advice, |
| 172 | .link_failure = ip6_link_failure, |
| 173 | .update_pmtu = ip6_rt_update_pmtu, |
| 174 | .local_out = __ip6_local_out, |
| 175 | .neigh_lookup = ip6_neigh_lookup, |
| 176 | }; |
| 177 | |
| 178 | static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst) |
| 179 | { |
| 180 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| 181 | |
| 182 | return mtu ? : dst->dev->mtu; |
| 183 | } |
| 184 | |
| 185 | static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 186 | { |
| 187 | } |
| 188 | |
| 189 | static u32 *ip6_rt_blackhole_cow_metrics(struct dst_entry *dst, |
| 190 | unsigned long old) |
| 191 | { |
| 192 | return NULL; |
| 193 | } |
| 194 | |
| 195 | static struct dst_ops ip6_dst_blackhole_ops = { |
| 196 | .family = AF_INET6, |
| 197 | .protocol = cpu_to_be16(ETH_P_IPV6), |
| 198 | .destroy = ip6_dst_destroy, |
| 199 | .check = ip6_dst_check, |
| 200 | .mtu = ip6_blackhole_mtu, |
| 201 | .default_advmss = ip6_default_advmss, |
| 202 | .update_pmtu = ip6_rt_blackhole_update_pmtu, |
| 203 | .cow_metrics = ip6_rt_blackhole_cow_metrics, |
| 204 | .neigh_lookup = ip6_neigh_lookup, |
| 205 | }; |
| 206 | |
| 207 | static const u32 ip6_template_metrics[RTAX_MAX] = { |
| 208 | [RTAX_HOPLIMIT - 1] = 255, |
| 209 | }; |
| 210 | |
| 211 | static struct rt6_info ip6_null_entry_template = { |
| 212 | .dst = { |
| 213 | .__refcnt = ATOMIC_INIT(1), |
| 214 | .__use = 1, |
| 215 | .obsolete = -1, |
| 216 | .error = -ENETUNREACH, |
| 217 | .input = ip6_pkt_discard, |
| 218 | .output = ip6_pkt_discard_out, |
| 219 | }, |
| 220 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 221 | .rt6i_protocol = RTPROT_KERNEL, |
| 222 | .rt6i_metric = ~(u32) 0, |
| 223 | .rt6i_ref = ATOMIC_INIT(1), |
| 224 | }; |
| 225 | |
| 226 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 227 | |
| 228 | static int ip6_pkt_prohibit(struct sk_buff *skb); |
| 229 | static int ip6_pkt_prohibit_out(struct sk_buff *skb); |
| 230 | |
| 231 | static struct rt6_info ip6_prohibit_entry_template = { |
| 232 | .dst = { |
| 233 | .__refcnt = ATOMIC_INIT(1), |
| 234 | .__use = 1, |
| 235 | .obsolete = -1, |
| 236 | .error = -EACCES, |
| 237 | .input = ip6_pkt_prohibit, |
| 238 | .output = ip6_pkt_prohibit_out, |
| 239 | }, |
| 240 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 241 | .rt6i_protocol = RTPROT_KERNEL, |
| 242 | .rt6i_metric = ~(u32) 0, |
| 243 | .rt6i_ref = ATOMIC_INIT(1), |
| 244 | }; |
| 245 | |
| 246 | static struct rt6_info ip6_blk_hole_entry_template = { |
| 247 | .dst = { |
| 248 | .__refcnt = ATOMIC_INIT(1), |
| 249 | .__use = 1, |
| 250 | .obsolete = -1, |
| 251 | .error = -EINVAL, |
| 252 | .input = dst_discard, |
| 253 | .output = dst_discard, |
| 254 | }, |
| 255 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 256 | .rt6i_protocol = RTPROT_KERNEL, |
| 257 | .rt6i_metric = ~(u32) 0, |
| 258 | .rt6i_ref = ATOMIC_INIT(1), |
| 259 | }; |
| 260 | |
| 261 | #endif |
| 262 | |
| 263 | /* allocate dst with ip6_dst_ops */ |
| 264 | static inline struct rt6_info *ip6_dst_alloc(struct dst_ops *ops, |
| 265 | struct net_device *dev, |
| 266 | int flags) |
| 267 | { |
| 268 | struct rt6_info *rt = dst_alloc(ops, dev, 0, 0, flags); |
| 269 | |
| 270 | if (rt) |
| 271 | memset(&rt->rt6i_table, 0, |
| 272 | sizeof(*rt) - sizeof(struct dst_entry)); |
| 273 | |
| 274 | return rt; |
| 275 | } |
| 276 | |
| 277 | static void ip6_dst_destroy(struct dst_entry *dst) |
| 278 | { |
| 279 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 280 | struct inet6_dev *idev = rt->rt6i_idev; |
| 281 | struct inet_peer *peer = rt->rt6i_peer; |
| 282 | |
| 283 | if (!(rt->dst.flags & DST_HOST)) |
| 284 | dst_destroy_metrics_generic(dst); |
| 285 | |
| 286 | if (idev) { |
| 287 | rt->rt6i_idev = NULL; |
| 288 | in6_dev_put(idev); |
| 289 | } |
| 290 | |
| 291 | if (!(rt->rt6i_flags & RTF_EXPIRES) && dst->from) |
| 292 | dst_release(dst->from); |
| 293 | |
| 294 | if (peer) { |
| 295 | rt->rt6i_peer = NULL; |
| 296 | inet_putpeer(peer); |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | static atomic_t __rt6_peer_genid = ATOMIC_INIT(0); |
| 301 | |
| 302 | static u32 rt6_peer_genid(void) |
| 303 | { |
| 304 | return atomic_read(&__rt6_peer_genid); |
| 305 | } |
| 306 | |
| 307 | void rt6_bind_peer(struct rt6_info *rt, int create) |
| 308 | { |
| 309 | struct inet_peer *peer; |
| 310 | |
| 311 | peer = inet_getpeer_v6(&rt->rt6i_dst.addr, create); |
| 312 | if (peer && cmpxchg(&rt->rt6i_peer, NULL, peer) != NULL) |
| 313 | inet_putpeer(peer); |
| 314 | else |
| 315 | rt->rt6i_peer_genid = rt6_peer_genid(); |
| 316 | } |
| 317 | |
| 318 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 319 | int how) |
| 320 | { |
| 321 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 322 | struct inet6_dev *idev = rt->rt6i_idev; |
| 323 | struct net_device *loopback_dev = |
| 324 | dev_net(dev)->loopback_dev; |
| 325 | |
| 326 | if (dev != loopback_dev && idev && idev->dev == dev) { |
| 327 | struct inet6_dev *loopback_idev = |
| 328 | in6_dev_get(loopback_dev); |
| 329 | if (loopback_idev) { |
| 330 | rt->rt6i_idev = loopback_idev; |
| 331 | in6_dev_put(idev); |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static bool rt6_check_expired(const struct rt6_info *rt) |
| 337 | { |
| 338 | struct rt6_info *ort = NULL; |
| 339 | |
| 340 | if (rt->rt6i_flags & RTF_EXPIRES) { |
| 341 | if (time_after(jiffies, rt->dst.expires)) |
| 342 | return true; |
| 343 | } else if (rt->dst.from) { |
| 344 | ort = (struct rt6_info *) rt->dst.from; |
| 345 | return (ort->rt6i_flags & RTF_EXPIRES) && |
| 346 | time_after(jiffies, ort->dst.expires); |
| 347 | } |
| 348 | return false; |
| 349 | } |
| 350 | |
| 351 | static bool rt6_need_strict(const struct in6_addr *daddr) |
| 352 | { |
| 353 | return ipv6_addr_type(daddr) & |
| 354 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Route lookup. Any table->tb6_lock is implied. |
| 359 | */ |
| 360 | |
| 361 | static inline struct rt6_info *rt6_device_match(struct net *net, |
| 362 | struct rt6_info *rt, |
| 363 | const struct in6_addr *saddr, |
| 364 | int oif, |
| 365 | int flags) |
| 366 | { |
| 367 | struct rt6_info *local = NULL; |
| 368 | struct rt6_info *sprt; |
| 369 | |
| 370 | if (!oif && ipv6_addr_any(saddr)) |
| 371 | goto out; |
| 372 | |
| 373 | for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) { |
| 374 | struct net_device *dev = sprt->dst.dev; |
| 375 | |
| 376 | if (oif) { |
| 377 | if (dev->ifindex == oif) |
| 378 | return sprt; |
| 379 | if (dev->flags & IFF_LOOPBACK) { |
| 380 | if (!sprt->rt6i_idev || |
| 381 | sprt->rt6i_idev->dev->ifindex != oif) { |
| 382 | if (flags & RT6_LOOKUP_F_IFACE && oif) |
| 383 | continue; |
| 384 | if (local && (!oif || |
| 385 | local->rt6i_idev->dev->ifindex == oif)) |
| 386 | continue; |
| 387 | } |
| 388 | local = sprt; |
| 389 | } |
| 390 | } else { |
| 391 | if (ipv6_chk_addr(net, saddr, dev, |
| 392 | flags & RT6_LOOKUP_F_IFACE)) |
| 393 | return sprt; |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | if (oif) { |
| 398 | if (local) |
| 399 | return local; |
| 400 | |
| 401 | if (flags & RT6_LOOKUP_F_IFACE) |
| 402 | return net->ipv6.ip6_null_entry; |
| 403 | } |
| 404 | out: |
| 405 | return rt; |
| 406 | } |
| 407 | |
| 408 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 409 | static void rt6_probe(struct rt6_info *rt) |
| 410 | { |
| 411 | struct neighbour *neigh; |
| 412 | /* |
| 413 | * Okay, this does not seem to be appropriate |
| 414 | * for now, however, we need to check if it |
| 415 | * is really so; aka Router Reachability Probing. |
| 416 | * |
| 417 | * Router Reachability Probe MUST be rate-limited |
| 418 | * to no more than one per minute. |
| 419 | */ |
| 420 | rcu_read_lock(); |
| 421 | neigh = rt ? dst_get_neighbour_noref(&rt->dst) : NULL; |
| 422 | if (!neigh || (neigh->nud_state & NUD_VALID)) |
| 423 | goto out; |
| 424 | read_lock_bh(&neigh->lock); |
| 425 | if (!(neigh->nud_state & NUD_VALID) && |
| 426 | time_after(jiffies, neigh->updated + rt->rt6i_idev->cnf.rtr_probe_interval)) { |
| 427 | struct in6_addr mcaddr; |
| 428 | struct in6_addr *target; |
| 429 | |
| 430 | neigh->updated = jiffies; |
| 431 | read_unlock_bh(&neigh->lock); |
| 432 | |
| 433 | target = (struct in6_addr *)&neigh->primary_key; |
| 434 | addrconf_addr_solict_mult(target, &mcaddr); |
| 435 | ndisc_send_ns(rt->dst.dev, NULL, target, &mcaddr, NULL); |
| 436 | } else { |
| 437 | read_unlock_bh(&neigh->lock); |
| 438 | } |
| 439 | out: |
| 440 | rcu_read_unlock(); |
| 441 | } |
| 442 | #else |
| 443 | static inline void rt6_probe(struct rt6_info *rt) |
| 444 | { |
| 445 | } |
| 446 | #endif |
| 447 | |
| 448 | /* |
| 449 | * Default Router Selection (RFC 2461 6.3.6) |
| 450 | */ |
| 451 | static inline int rt6_check_dev(struct rt6_info *rt, int oif) |
| 452 | { |
| 453 | struct net_device *dev = rt->dst.dev; |
| 454 | if (!oif || dev->ifindex == oif) |
| 455 | return 2; |
| 456 | if ((dev->flags & IFF_LOOPBACK) && |
| 457 | rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif) |
| 458 | return 1; |
| 459 | return 0; |
| 460 | } |
| 461 | |
| 462 | static inline int rt6_check_neigh(struct rt6_info *rt) |
| 463 | { |
| 464 | struct neighbour *neigh; |
| 465 | int m; |
| 466 | |
| 467 | rcu_read_lock(); |
| 468 | neigh = dst_get_neighbour_noref(&rt->dst); |
| 469 | if (rt->rt6i_flags & RTF_NONEXTHOP || |
| 470 | !(rt->rt6i_flags & RTF_GATEWAY)) |
| 471 | m = 1; |
| 472 | else if (neigh) { |
| 473 | read_lock_bh(&neigh->lock); |
| 474 | if (neigh->nud_state & NUD_VALID) |
| 475 | m = 2; |
| 476 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 477 | else if (neigh->nud_state & NUD_FAILED) |
| 478 | m = 0; |
| 479 | #endif |
| 480 | else |
| 481 | m = 1; |
| 482 | read_unlock_bh(&neigh->lock); |
| 483 | } else |
| 484 | m = 0; |
| 485 | rcu_read_unlock(); |
| 486 | return m; |
| 487 | } |
| 488 | |
| 489 | static int rt6_score_route(struct rt6_info *rt, int oif, |
| 490 | int strict) |
| 491 | { |
| 492 | int m, n; |
| 493 | |
| 494 | m = rt6_check_dev(rt, oif); |
| 495 | if (!m && (strict & RT6_LOOKUP_F_IFACE)) |
| 496 | return -1; |
| 497 | #ifdef CONFIG_IPV6_ROUTER_PREF |
| 498 | m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2; |
| 499 | #endif |
| 500 | n = rt6_check_neigh(rt); |
| 501 | if (!n && (strict & RT6_LOOKUP_F_REACHABLE)) |
| 502 | return -1; |
| 503 | return m; |
| 504 | } |
| 505 | |
| 506 | static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict, |
| 507 | int *mpri, struct rt6_info *match) |
| 508 | { |
| 509 | int m; |
| 510 | |
| 511 | if (rt6_check_expired(rt)) |
| 512 | goto out; |
| 513 | |
| 514 | m = rt6_score_route(rt, oif, strict); |
| 515 | if (m < 0) |
| 516 | goto out; |
| 517 | |
| 518 | if (m > *mpri) { |
| 519 | if (strict & RT6_LOOKUP_F_REACHABLE) |
| 520 | rt6_probe(match); |
| 521 | *mpri = m; |
| 522 | match = rt; |
| 523 | } else if (strict & RT6_LOOKUP_F_REACHABLE) { |
| 524 | rt6_probe(rt); |
| 525 | } |
| 526 | |
| 527 | out: |
| 528 | return match; |
| 529 | } |
| 530 | |
| 531 | static struct rt6_info *find_rr_leaf(struct fib6_node *fn, |
| 532 | struct rt6_info *rr_head, |
| 533 | u32 metric, int oif, int strict) |
| 534 | { |
| 535 | struct rt6_info *rt, *match; |
| 536 | int mpri = -1; |
| 537 | |
| 538 | match = NULL; |
| 539 | for (rt = rr_head; rt && rt->rt6i_metric == metric; |
| 540 | rt = rt->dst.rt6_next) |
| 541 | match = find_match(rt, oif, strict, &mpri, match); |
| 542 | for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric; |
| 543 | rt = rt->dst.rt6_next) |
| 544 | match = find_match(rt, oif, strict, &mpri, match); |
| 545 | |
| 546 | return match; |
| 547 | } |
| 548 | |
| 549 | static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict) |
| 550 | { |
| 551 | struct rt6_info *match, *rt0; |
| 552 | struct net *net; |
| 553 | |
| 554 | rt0 = fn->rr_ptr; |
| 555 | if (!rt0) |
| 556 | fn->rr_ptr = rt0 = fn->leaf; |
| 557 | |
| 558 | match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict); |
| 559 | |
| 560 | if (!match && |
| 561 | (strict & RT6_LOOKUP_F_REACHABLE)) { |
| 562 | struct rt6_info *next = rt0->dst.rt6_next; |
| 563 | |
| 564 | /* no entries matched; do round-robin */ |
| 565 | if (!next || next->rt6i_metric != rt0->rt6i_metric) |
| 566 | next = fn->leaf; |
| 567 | |
| 568 | if (next != rt0) |
| 569 | fn->rr_ptr = next; |
| 570 | } |
| 571 | |
| 572 | net = dev_net(rt0->dst.dev); |
| 573 | return match ? match : net->ipv6.ip6_null_entry; |
| 574 | } |
| 575 | |
| 576 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 577 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, |
| 578 | const struct in6_addr *gwaddr) |
| 579 | { |
| 580 | struct net *net = dev_net(dev); |
| 581 | struct route_info *rinfo = (struct route_info *) opt; |
| 582 | struct in6_addr prefix_buf, *prefix; |
| 583 | unsigned int pref; |
| 584 | unsigned long lifetime; |
| 585 | struct rt6_info *rt; |
| 586 | |
| 587 | if (len < sizeof(struct route_info)) { |
| 588 | return -EINVAL; |
| 589 | } |
| 590 | |
| 591 | /* Sanity check for prefix_len and length */ |
| 592 | if (rinfo->length > 3) { |
| 593 | return -EINVAL; |
| 594 | } else if (rinfo->prefix_len > 128) { |
| 595 | return -EINVAL; |
| 596 | } else if (rinfo->prefix_len > 64) { |
| 597 | if (rinfo->length < 2) { |
| 598 | return -EINVAL; |
| 599 | } |
| 600 | } else if (rinfo->prefix_len > 0) { |
| 601 | if (rinfo->length < 1) { |
| 602 | return -EINVAL; |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | pref = rinfo->route_pref; |
| 607 | if (pref == ICMPV6_ROUTER_PREF_INVALID) |
| 608 | return -EINVAL; |
| 609 | |
| 610 | lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ); |
| 611 | |
| 612 | if (rinfo->length == 3) |
| 613 | prefix = (struct in6_addr *)rinfo->prefix; |
| 614 | else { |
| 615 | /* this function is safe */ |
| 616 | ipv6_addr_prefix(&prefix_buf, |
| 617 | (struct in6_addr *)rinfo->prefix, |
| 618 | rinfo->prefix_len); |
| 619 | prefix = &prefix_buf; |
| 620 | } |
| 621 | |
| 622 | rt = rt6_get_route_info(net, prefix, rinfo->prefix_len, gwaddr, |
| 623 | dev->ifindex); |
| 624 | |
| 625 | if (rt && !lifetime) { |
| 626 | ip6_del_rt(rt); |
| 627 | rt = NULL; |
| 628 | } |
| 629 | |
| 630 | if (!rt && lifetime) |
| 631 | rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr, dev->ifindex, |
| 632 | pref); |
| 633 | else if (rt) |
| 634 | rt->rt6i_flags = RTF_ROUTEINFO | |
| 635 | (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
| 636 | |
| 637 | if (rt) { |
| 638 | if (!addrconf_finite_timeout(lifetime)) |
| 639 | rt6_clean_expires(rt); |
| 640 | else |
| 641 | rt6_set_expires(rt, jiffies + HZ * lifetime); |
| 642 | |
| 643 | dst_release(&rt->dst); |
| 644 | } |
| 645 | return 0; |
| 646 | } |
| 647 | #endif |
| 648 | |
| 649 | #define BACKTRACK(__net, saddr) \ |
| 650 | do { \ |
| 651 | if (rt == __net->ipv6.ip6_null_entry) { \ |
| 652 | struct fib6_node *pn; \ |
| 653 | while (1) { \ |
| 654 | if (fn->fn_flags & RTN_TL_ROOT) \ |
| 655 | goto out; \ |
| 656 | pn = fn->parent; \ |
| 657 | if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn) \ |
| 658 | fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr); \ |
| 659 | else \ |
| 660 | fn = pn; \ |
| 661 | if (fn->fn_flags & RTN_RTINFO) \ |
| 662 | goto restart; \ |
| 663 | } \ |
| 664 | } \ |
| 665 | } while (0) |
| 666 | |
| 667 | static struct rt6_info *ip6_pol_route_lookup(struct net *net, |
| 668 | struct fib6_table *table, |
| 669 | struct flowi6 *fl6, int flags) |
| 670 | { |
| 671 | struct fib6_node *fn; |
| 672 | struct rt6_info *rt; |
| 673 | |
| 674 | read_lock_bh(&table->tb6_lock); |
| 675 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
| 676 | restart: |
| 677 | rt = fn->leaf; |
| 678 | rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags); |
| 679 | BACKTRACK(net, &fl6->saddr); |
| 680 | out: |
| 681 | dst_use(&rt->dst, jiffies); |
| 682 | read_unlock_bh(&table->tb6_lock); |
| 683 | return rt; |
| 684 | |
| 685 | } |
| 686 | |
| 687 | struct dst_entry * ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
| 688 | int flags) |
| 689 | { |
| 690 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup); |
| 691 | } |
| 692 | EXPORT_SYMBOL_GPL(ip6_route_lookup); |
| 693 | |
| 694 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
| 695 | const struct in6_addr *saddr, int oif, int strict) |
| 696 | { |
| 697 | struct flowi6 fl6 = { |
| 698 | .flowi6_oif = oif, |
| 699 | .daddr = *daddr, |
| 700 | }; |
| 701 | struct dst_entry *dst; |
| 702 | int flags = strict ? RT6_LOOKUP_F_IFACE : 0; |
| 703 | |
| 704 | if (saddr) { |
| 705 | memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
| 706 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 707 | } |
| 708 | |
| 709 | dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup); |
| 710 | if (dst->error == 0) |
| 711 | return (struct rt6_info *) dst; |
| 712 | |
| 713 | dst_release(dst); |
| 714 | |
| 715 | return NULL; |
| 716 | } |
| 717 | |
| 718 | EXPORT_SYMBOL(rt6_lookup); |
| 719 | |
| 720 | /* ip6_ins_rt is called with FREE table->tb6_lock. |
| 721 | It takes new route entry, the addition fails by any reason the |
| 722 | route is freed. In any case, if caller does not hold it, it may |
| 723 | be destroyed. |
| 724 | */ |
| 725 | |
| 726 | static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info) |
| 727 | { |
| 728 | int err; |
| 729 | struct fib6_table *table; |
| 730 | |
| 731 | table = rt->rt6i_table; |
| 732 | write_lock_bh(&table->tb6_lock); |
| 733 | err = fib6_add(&table->tb6_root, rt, info); |
| 734 | write_unlock_bh(&table->tb6_lock); |
| 735 | |
| 736 | return err; |
| 737 | } |
| 738 | |
| 739 | int ip6_ins_rt(struct rt6_info *rt) |
| 740 | { |
| 741 | struct nl_info info = { |
| 742 | .nl_net = dev_net(rt->dst.dev), |
| 743 | }; |
| 744 | return __ip6_ins_rt(rt, &info); |
| 745 | } |
| 746 | |
| 747 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, |
| 748 | const struct in6_addr *daddr, |
| 749 | const struct in6_addr *saddr) |
| 750 | { |
| 751 | struct rt6_info *rt; |
| 752 | |
| 753 | /* |
| 754 | * Clone the route. |
| 755 | */ |
| 756 | |
| 757 | rt = ip6_rt_copy(ort, daddr); |
| 758 | |
| 759 | if (rt) { |
| 760 | int attempts = !in_softirq(); |
| 761 | |
| 762 | if (!(rt->rt6i_flags & RTF_GATEWAY)) { |
| 763 | if (ort->rt6i_dst.plen != 128 && |
| 764 | ipv6_addr_equal(&ort->rt6i_dst.addr, daddr)) |
| 765 | rt->rt6i_flags |= RTF_ANYCAST; |
| 766 | rt->rt6i_gateway = *daddr; |
| 767 | } |
| 768 | |
| 769 | rt->rt6i_flags |= RTF_CACHE; |
| 770 | |
| 771 | #ifdef CONFIG_IPV6_SUBTREES |
| 772 | if (rt->rt6i_src.plen && saddr) { |
| 773 | rt->rt6i_src.addr = *saddr; |
| 774 | rt->rt6i_src.plen = 128; |
| 775 | } |
| 776 | #endif |
| 777 | |
| 778 | retry: |
| 779 | if (rt6_bind_neighbour(rt, rt->dst.dev)) { |
| 780 | struct net *net = dev_net(rt->dst.dev); |
| 781 | int saved_rt_min_interval = |
| 782 | net->ipv6.sysctl.ip6_rt_gc_min_interval; |
| 783 | int saved_rt_elasticity = |
| 784 | net->ipv6.sysctl.ip6_rt_gc_elasticity; |
| 785 | |
| 786 | if (attempts-- > 0) { |
| 787 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 1; |
| 788 | net->ipv6.sysctl.ip6_rt_gc_min_interval = 0; |
| 789 | |
| 790 | ip6_dst_gc(&net->ipv6.ip6_dst_ops); |
| 791 | |
| 792 | net->ipv6.sysctl.ip6_rt_gc_elasticity = |
| 793 | saved_rt_elasticity; |
| 794 | net->ipv6.sysctl.ip6_rt_gc_min_interval = |
| 795 | saved_rt_min_interval; |
| 796 | goto retry; |
| 797 | } |
| 798 | |
| 799 | net_warn_ratelimited("Neighbour table overflow\n"); |
| 800 | dst_free(&rt->dst); |
| 801 | return NULL; |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | return rt; |
| 806 | } |
| 807 | |
| 808 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, |
| 809 | const struct in6_addr *daddr) |
| 810 | { |
| 811 | struct rt6_info *rt = ip6_rt_copy(ort, daddr); |
| 812 | |
| 813 | if (rt) { |
| 814 | rt->rt6i_flags |= RTF_CACHE; |
| 815 | dst_set_neighbour(&rt->dst, neigh_clone(dst_get_neighbour_noref_raw(&ort->dst))); |
| 816 | } |
| 817 | return rt; |
| 818 | } |
| 819 | |
| 820 | static struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, int oif, |
| 821 | struct flowi6 *fl6, int flags) |
| 822 | { |
| 823 | struct fib6_node *fn; |
| 824 | struct rt6_info *rt, *nrt; |
| 825 | int strict = 0; |
| 826 | int attempts = 3; |
| 827 | int err; |
| 828 | int reachable = net->ipv6.devconf_all->forwarding ? 0 : RT6_LOOKUP_F_REACHABLE; |
| 829 | |
| 830 | strict |= flags & RT6_LOOKUP_F_IFACE; |
| 831 | |
| 832 | relookup: |
| 833 | read_lock_bh(&table->tb6_lock); |
| 834 | |
| 835 | restart_2: |
| 836 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
| 837 | |
| 838 | restart: |
| 839 | rt = rt6_select(fn, oif, strict | reachable); |
| 840 | |
| 841 | BACKTRACK(net, &fl6->saddr); |
| 842 | if (rt == net->ipv6.ip6_null_entry || |
| 843 | rt->rt6i_flags & RTF_CACHE) |
| 844 | goto out; |
| 845 | |
| 846 | dst_hold(&rt->dst); |
| 847 | read_unlock_bh(&table->tb6_lock); |
| 848 | |
| 849 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
| 850 | nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr); |
| 851 | else if (!(rt->dst.flags & DST_HOST)) |
| 852 | nrt = rt6_alloc_clone(rt, &fl6->daddr); |
| 853 | else |
| 854 | goto out2; |
| 855 | |
| 856 | dst_release(&rt->dst); |
| 857 | rt = nrt ? : net->ipv6.ip6_null_entry; |
| 858 | |
| 859 | dst_hold(&rt->dst); |
| 860 | if (nrt) { |
| 861 | err = ip6_ins_rt(nrt); |
| 862 | if (!err) |
| 863 | goto out2; |
| 864 | } |
| 865 | |
| 866 | if (--attempts <= 0) |
| 867 | goto out2; |
| 868 | |
| 869 | /* |
| 870 | * Race condition! In the gap, when table->tb6_lock was |
| 871 | * released someone could insert this route. Relookup. |
| 872 | */ |
| 873 | dst_release(&rt->dst); |
| 874 | goto relookup; |
| 875 | |
| 876 | out: |
| 877 | if (reachable) { |
| 878 | reachable = 0; |
| 879 | goto restart_2; |
| 880 | } |
| 881 | dst_hold(&rt->dst); |
| 882 | read_unlock_bh(&table->tb6_lock); |
| 883 | out2: |
| 884 | rt->dst.lastuse = jiffies; |
| 885 | rt->dst.__use++; |
| 886 | |
| 887 | return rt; |
| 888 | } |
| 889 | |
| 890 | static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table, |
| 891 | struct flowi6 *fl6, int flags) |
| 892 | { |
| 893 | return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags); |
| 894 | } |
| 895 | |
| 896 | static struct dst_entry *ip6_route_input_lookup(struct net *net, |
| 897 | struct net_device *dev, |
| 898 | struct flowi6 *fl6, int flags) |
| 899 | { |
| 900 | if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG) |
| 901 | flags |= RT6_LOOKUP_F_IFACE; |
| 902 | |
| 903 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input); |
| 904 | } |
| 905 | |
| 906 | void ip6_route_input(struct sk_buff *skb) |
| 907 | { |
| 908 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
| 909 | struct net *net = dev_net(skb->dev); |
| 910 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
| 911 | struct flowi6 fl6 = { |
| 912 | .flowi6_iif = skb->dev->ifindex, |
| 913 | .daddr = iph->daddr, |
| 914 | .saddr = iph->saddr, |
| 915 | .flowlabel = (* (__be32 *) iph) & IPV6_FLOWINFO_MASK, |
| 916 | .flowi6_mark = skb->mark, |
| 917 | .flowi6_proto = iph->nexthdr, |
| 918 | }; |
| 919 | |
| 920 | skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags)); |
| 921 | } |
| 922 | |
| 923 | static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table, |
| 924 | struct flowi6 *fl6, int flags) |
| 925 | { |
| 926 | return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags); |
| 927 | } |
| 928 | |
| 929 | struct dst_entry * ip6_route_output(struct net *net, const struct sock *sk, |
| 930 | struct flowi6 *fl6) |
| 931 | { |
| 932 | int flags = 0; |
| 933 | |
| 934 | if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr)) |
| 935 | flags |= RT6_LOOKUP_F_IFACE; |
| 936 | |
| 937 | if (!ipv6_addr_any(&fl6->saddr)) |
| 938 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 939 | else if (sk) |
| 940 | flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs); |
| 941 | |
| 942 | return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output); |
| 943 | } |
| 944 | |
| 945 | EXPORT_SYMBOL(ip6_route_output); |
| 946 | |
| 947 | struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
| 948 | { |
| 949 | struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig; |
| 950 | struct dst_entry *new = NULL; |
| 951 | |
| 952 | rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, 0, 0); |
| 953 | if (rt) { |
| 954 | memset(&rt->rt6i_table, 0, sizeof(*rt) - sizeof(struct dst_entry)); |
| 955 | |
| 956 | new = &rt->dst; |
| 957 | |
| 958 | new->__use = 1; |
| 959 | new->input = dst_discard; |
| 960 | new->output = dst_discard; |
| 961 | |
| 962 | if (dst_metrics_read_only(&ort->dst)) |
| 963 | new->_metrics = ort->dst._metrics; |
| 964 | else |
| 965 | dst_copy_metrics(new, &ort->dst); |
| 966 | rt->rt6i_idev = ort->rt6i_idev; |
| 967 | if (rt->rt6i_idev) |
| 968 | in6_dev_hold(rt->rt6i_idev); |
| 969 | |
| 970 | rt->rt6i_gateway = ort->rt6i_gateway; |
| 971 | rt->rt6i_flags = ort->rt6i_flags; |
| 972 | rt6_clean_expires(rt); |
| 973 | rt->rt6i_metric = 0; |
| 974 | |
| 975 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); |
| 976 | #ifdef CONFIG_IPV6_SUBTREES |
| 977 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); |
| 978 | #endif |
| 979 | |
| 980 | dst_free(new); |
| 981 | } |
| 982 | |
| 983 | dst_release(dst_orig); |
| 984 | return new ? new : ERR_PTR(-ENOMEM); |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * Destination cache support functions |
| 989 | */ |
| 990 | |
| 991 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
| 992 | { |
| 993 | struct rt6_info *rt; |
| 994 | |
| 995 | rt = (struct rt6_info *) dst; |
| 996 | |
| 997 | if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) { |
| 998 | if (rt->rt6i_peer_genid != rt6_peer_genid()) { |
| 999 | if (!rt->rt6i_peer) |
| 1000 | rt6_bind_peer(rt, 0); |
| 1001 | rt->rt6i_peer_genid = rt6_peer_genid(); |
| 1002 | } |
| 1003 | return dst; |
| 1004 | } |
| 1005 | return NULL; |
| 1006 | } |
| 1007 | |
| 1008 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) |
| 1009 | { |
| 1010 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 1011 | |
| 1012 | if (rt) { |
| 1013 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1014 | if (rt6_check_expired(rt)) { |
| 1015 | ip6_del_rt(rt); |
| 1016 | dst = NULL; |
| 1017 | } |
| 1018 | } else { |
| 1019 | dst_release(dst); |
| 1020 | dst = NULL; |
| 1021 | } |
| 1022 | } |
| 1023 | return dst; |
| 1024 | } |
| 1025 | |
| 1026 | static void ip6_link_failure(struct sk_buff *skb) |
| 1027 | { |
| 1028 | struct rt6_info *rt; |
| 1029 | |
| 1030 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0); |
| 1031 | |
| 1032 | rt = (struct rt6_info *) skb_dst(skb); |
| 1033 | if (rt) { |
| 1034 | if (rt->rt6i_flags & RTF_CACHE) |
| 1035 | rt6_update_expires(rt, 0); |
| 1036 | else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) |
| 1037 | rt->rt6i_node->fn_sernum = -1; |
| 1038 | } |
| 1039 | } |
| 1040 | |
| 1041 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 1042 | { |
| 1043 | struct rt6_info *rt6 = (struct rt6_info*)dst; |
| 1044 | |
| 1045 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
| 1046 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 1047 | if (mtu < IPV6_MIN_MTU) { |
| 1048 | u32 features = dst_metric(dst, RTAX_FEATURES); |
| 1049 | mtu = IPV6_MIN_MTU; |
| 1050 | features |= RTAX_FEATURE_ALLFRAG; |
| 1051 | dst_metric_set(dst, RTAX_FEATURES, features); |
| 1052 | } |
| 1053 | dst_metric_set(dst, RTAX_MTU, mtu); |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | static unsigned int ip6_default_advmss(const struct dst_entry *dst) |
| 1058 | { |
| 1059 | struct net_device *dev = dst->dev; |
| 1060 | unsigned int mtu = dst_mtu(dst); |
| 1061 | struct net *net = dev_net(dev); |
| 1062 | |
| 1063 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
| 1064 | |
| 1065 | if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss) |
| 1066 | mtu = net->ipv6.sysctl.ip6_rt_min_advmss; |
| 1067 | |
| 1068 | /* |
| 1069 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
| 1070 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. |
| 1071 | * IPV6_MAXPLEN is also valid and means: "any MSS, |
| 1072 | * rely only on pmtu discovery" |
| 1073 | */ |
| 1074 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) |
| 1075 | mtu = IPV6_MAXPLEN; |
| 1076 | return mtu; |
| 1077 | } |
| 1078 | |
| 1079 | static unsigned int ip6_mtu(const struct dst_entry *dst) |
| 1080 | { |
| 1081 | struct inet6_dev *idev; |
| 1082 | unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); |
| 1083 | |
| 1084 | if (mtu) |
| 1085 | return mtu; |
| 1086 | |
| 1087 | mtu = IPV6_MIN_MTU; |
| 1088 | |
| 1089 | rcu_read_lock(); |
| 1090 | idev = __in6_dev_get(dst->dev); |
| 1091 | if (idev) |
| 1092 | mtu = idev->cnf.mtu6; |
| 1093 | rcu_read_unlock(); |
| 1094 | |
| 1095 | return mtu; |
| 1096 | } |
| 1097 | |
| 1098 | static struct dst_entry *icmp6_dst_gc_list; |
| 1099 | static DEFINE_SPINLOCK(icmp6_dst_lock); |
| 1100 | |
| 1101 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, |
| 1102 | struct neighbour *neigh, |
| 1103 | struct flowi6 *fl6) |
| 1104 | { |
| 1105 | struct dst_entry *dst; |
| 1106 | struct rt6_info *rt; |
| 1107 | struct inet6_dev *idev = in6_dev_get(dev); |
| 1108 | struct net *net = dev_net(dev); |
| 1109 | |
| 1110 | if (unlikely(!idev)) |
| 1111 | return ERR_PTR(-ENODEV); |
| 1112 | |
| 1113 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, dev, 0); |
| 1114 | if (unlikely(!rt)) { |
| 1115 | in6_dev_put(idev); |
| 1116 | dst = ERR_PTR(-ENOMEM); |
| 1117 | goto out; |
| 1118 | } |
| 1119 | |
| 1120 | if (neigh) |
| 1121 | neigh_hold(neigh); |
| 1122 | else { |
| 1123 | neigh = ip6_neigh_lookup(&rt->dst, &fl6->daddr); |
| 1124 | if (IS_ERR(neigh)) { |
| 1125 | in6_dev_put(idev); |
| 1126 | dst_free(&rt->dst); |
| 1127 | return ERR_CAST(neigh); |
| 1128 | } |
| 1129 | } |
| 1130 | |
| 1131 | rt->dst.flags |= DST_HOST; |
| 1132 | rt->dst.output = ip6_output; |
| 1133 | dst_set_neighbour(&rt->dst, neigh); |
| 1134 | atomic_set(&rt->dst.__refcnt, 1); |
| 1135 | rt->rt6i_dst.addr = fl6->daddr; |
| 1136 | rt->rt6i_dst.plen = 128; |
| 1137 | rt->rt6i_idev = idev; |
| 1138 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 255); |
| 1139 | |
| 1140 | spin_lock_bh(&icmp6_dst_lock); |
| 1141 | rt->dst.next = icmp6_dst_gc_list; |
| 1142 | icmp6_dst_gc_list = &rt->dst; |
| 1143 | spin_unlock_bh(&icmp6_dst_lock); |
| 1144 | |
| 1145 | fib6_force_start_gc(net); |
| 1146 | |
| 1147 | dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0); |
| 1148 | |
| 1149 | out: |
| 1150 | return dst; |
| 1151 | } |
| 1152 | |
| 1153 | int icmp6_dst_gc(void) |
| 1154 | { |
| 1155 | struct dst_entry *dst, **pprev; |
| 1156 | int more = 0; |
| 1157 | |
| 1158 | spin_lock_bh(&icmp6_dst_lock); |
| 1159 | pprev = &icmp6_dst_gc_list; |
| 1160 | |
| 1161 | while ((dst = *pprev) != NULL) { |
| 1162 | if (!atomic_read(&dst->__refcnt)) { |
| 1163 | *pprev = dst->next; |
| 1164 | dst_free(dst); |
| 1165 | } else { |
| 1166 | pprev = &dst->next; |
| 1167 | ++more; |
| 1168 | } |
| 1169 | } |
| 1170 | |
| 1171 | spin_unlock_bh(&icmp6_dst_lock); |
| 1172 | |
| 1173 | return more; |
| 1174 | } |
| 1175 | |
| 1176 | static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg), |
| 1177 | void *arg) |
| 1178 | { |
| 1179 | struct dst_entry *dst, **pprev; |
| 1180 | |
| 1181 | spin_lock_bh(&icmp6_dst_lock); |
| 1182 | pprev = &icmp6_dst_gc_list; |
| 1183 | while ((dst = *pprev) != NULL) { |
| 1184 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 1185 | if (func(rt, arg)) { |
| 1186 | *pprev = dst->next; |
| 1187 | dst_free(dst); |
| 1188 | } else { |
| 1189 | pprev = &dst->next; |
| 1190 | } |
| 1191 | } |
| 1192 | spin_unlock_bh(&icmp6_dst_lock); |
| 1193 | } |
| 1194 | |
| 1195 | static int ip6_dst_gc(struct dst_ops *ops) |
| 1196 | { |
| 1197 | unsigned long now = jiffies; |
| 1198 | struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops); |
| 1199 | int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval; |
| 1200 | int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size; |
| 1201 | int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity; |
| 1202 | int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout; |
| 1203 | unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc; |
| 1204 | int entries; |
| 1205 | |
| 1206 | entries = dst_entries_get_fast(ops); |
| 1207 | if (time_after(rt_last_gc + rt_min_interval, now) && |
| 1208 | entries <= rt_max_size) |
| 1209 | goto out; |
| 1210 | |
| 1211 | net->ipv6.ip6_rt_gc_expire++; |
| 1212 | fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net); |
| 1213 | net->ipv6.ip6_rt_last_gc = now; |
| 1214 | entries = dst_entries_get_slow(ops); |
| 1215 | if (entries < ops->gc_thresh) |
| 1216 | net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1; |
| 1217 | out: |
| 1218 | net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity; |
| 1219 | return entries > rt_max_size; |
| 1220 | } |
| 1221 | |
| 1222 | /* Clean host part of a prefix. Not necessary in radix tree, |
| 1223 | but results in cleaner routing tables. |
| 1224 | |
| 1225 | Remove it only when all the things will work! |
| 1226 | */ |
| 1227 | |
| 1228 | int ip6_dst_hoplimit(struct dst_entry *dst) |
| 1229 | { |
| 1230 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); |
| 1231 | if (hoplimit == 0) { |
| 1232 | struct net_device *dev = dst->dev; |
| 1233 | struct inet6_dev *idev; |
| 1234 | |
| 1235 | rcu_read_lock(); |
| 1236 | idev = __in6_dev_get(dev); |
| 1237 | if (idev) |
| 1238 | hoplimit = idev->cnf.hop_limit; |
| 1239 | else |
| 1240 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; |
| 1241 | rcu_read_unlock(); |
| 1242 | } |
| 1243 | return hoplimit; |
| 1244 | } |
| 1245 | EXPORT_SYMBOL(ip6_dst_hoplimit); |
| 1246 | |
| 1247 | /* |
| 1248 | * |
| 1249 | */ |
| 1250 | |
| 1251 | int ip6_route_add(struct fib6_config *cfg) |
| 1252 | { |
| 1253 | int err; |
| 1254 | struct net *net = cfg->fc_nlinfo.nl_net; |
| 1255 | struct rt6_info *rt = NULL; |
| 1256 | struct net_device *dev = NULL; |
| 1257 | struct inet6_dev *idev = NULL; |
| 1258 | struct fib6_table *table; |
| 1259 | int addr_type; |
| 1260 | |
| 1261 | if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128) |
| 1262 | return -EINVAL; |
| 1263 | #ifndef CONFIG_IPV6_SUBTREES |
| 1264 | if (cfg->fc_src_len) |
| 1265 | return -EINVAL; |
| 1266 | #endif |
| 1267 | if (cfg->fc_ifindex) { |
| 1268 | err = -ENODEV; |
| 1269 | dev = dev_get_by_index(net, cfg->fc_ifindex); |
| 1270 | if (!dev) |
| 1271 | goto out; |
| 1272 | idev = in6_dev_get(dev); |
| 1273 | if (!idev) |
| 1274 | goto out; |
| 1275 | } |
| 1276 | |
| 1277 | if (cfg->fc_metric == 0) |
| 1278 | cfg->fc_metric = IP6_RT_PRIO_USER; |
| 1279 | |
| 1280 | err = -ENOBUFS; |
| 1281 | if (cfg->fc_nlinfo.nlh && |
| 1282 | !(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) { |
| 1283 | table = fib6_get_table(net, cfg->fc_table); |
| 1284 | if (!table) { |
| 1285 | pr_warn("NLM_F_CREATE should be specified when creating new route\n"); |
| 1286 | table = fib6_new_table(net, cfg->fc_table); |
| 1287 | } |
| 1288 | } else { |
| 1289 | table = fib6_new_table(net, cfg->fc_table); |
| 1290 | } |
| 1291 | |
| 1292 | if (!table) |
| 1293 | goto out; |
| 1294 | |
| 1295 | rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, NULL, DST_NOCOUNT); |
| 1296 | |
| 1297 | if (!rt) { |
| 1298 | err = -ENOMEM; |
| 1299 | goto out; |
| 1300 | } |
| 1301 | |
| 1302 | rt->dst.obsolete = -1; |
| 1303 | |
| 1304 | if (cfg->fc_flags & RTF_EXPIRES) |
| 1305 | rt6_set_expires(rt, jiffies + |
| 1306 | clock_t_to_jiffies(cfg->fc_expires)); |
| 1307 | else |
| 1308 | rt6_clean_expires(rt); |
| 1309 | |
| 1310 | if (cfg->fc_protocol == RTPROT_UNSPEC) |
| 1311 | cfg->fc_protocol = RTPROT_BOOT; |
| 1312 | rt->rt6i_protocol = cfg->fc_protocol; |
| 1313 | |
| 1314 | addr_type = ipv6_addr_type(&cfg->fc_dst); |
| 1315 | |
| 1316 | if (addr_type & IPV6_ADDR_MULTICAST) |
| 1317 | rt->dst.input = ip6_mc_input; |
| 1318 | else if (cfg->fc_flags & RTF_LOCAL) |
| 1319 | rt->dst.input = ip6_input; |
| 1320 | else |
| 1321 | rt->dst.input = ip6_forward; |
| 1322 | |
| 1323 | rt->dst.output = ip6_output; |
| 1324 | |
| 1325 | ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len); |
| 1326 | rt->rt6i_dst.plen = cfg->fc_dst_len; |
| 1327 | if (rt->rt6i_dst.plen == 128) |
| 1328 | rt->dst.flags |= DST_HOST; |
| 1329 | |
| 1330 | if (!(rt->dst.flags & DST_HOST) && cfg->fc_mx) { |
| 1331 | u32 *metrics = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); |
| 1332 | if (!metrics) { |
| 1333 | err = -ENOMEM; |
| 1334 | goto out; |
| 1335 | } |
| 1336 | dst_init_metrics(&rt->dst, metrics, 0); |
| 1337 | } |
| 1338 | #ifdef CONFIG_IPV6_SUBTREES |
| 1339 | ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len); |
| 1340 | rt->rt6i_src.plen = cfg->fc_src_len; |
| 1341 | #endif |
| 1342 | |
| 1343 | rt->rt6i_metric = cfg->fc_metric; |
| 1344 | |
| 1345 | /* We cannot add true routes via loopback here, |
| 1346 | they would result in kernel looping; promote them to reject routes |
| 1347 | */ |
| 1348 | if ((cfg->fc_flags & RTF_REJECT) || |
| 1349 | (dev && (dev->flags & IFF_LOOPBACK) && |
| 1350 | !(addr_type & IPV6_ADDR_LOOPBACK) && |
| 1351 | !(cfg->fc_flags & RTF_LOCAL))) { |
| 1352 | /* hold loopback dev/idev if we haven't done so. */ |
| 1353 | if (dev != net->loopback_dev) { |
| 1354 | if (dev) { |
| 1355 | dev_put(dev); |
| 1356 | in6_dev_put(idev); |
| 1357 | } |
| 1358 | dev = net->loopback_dev; |
| 1359 | dev_hold(dev); |
| 1360 | idev = in6_dev_get(dev); |
| 1361 | if (!idev) { |
| 1362 | err = -ENODEV; |
| 1363 | goto out; |
| 1364 | } |
| 1365 | } |
| 1366 | rt->dst.output = ip6_pkt_discard_out; |
| 1367 | rt->dst.input = ip6_pkt_discard; |
| 1368 | rt->dst.error = -ENETUNREACH; |
| 1369 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
| 1370 | goto install_route; |
| 1371 | } |
| 1372 | |
| 1373 | if (cfg->fc_flags & RTF_GATEWAY) { |
| 1374 | const struct in6_addr *gw_addr; |
| 1375 | int gwa_type; |
| 1376 | |
| 1377 | gw_addr = &cfg->fc_gateway; |
| 1378 | rt->rt6i_gateway = *gw_addr; |
| 1379 | gwa_type = ipv6_addr_type(gw_addr); |
| 1380 | |
| 1381 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { |
| 1382 | struct rt6_info *grt; |
| 1383 | |
| 1384 | /* IPv6 strictly inhibits using not link-local |
| 1385 | addresses as nexthop address. |
| 1386 | Otherwise, router will not able to send redirects. |
| 1387 | It is very good, but in some (rare!) circumstances |
| 1388 | (SIT, PtP, NBMA NOARP links) it is handy to allow |
| 1389 | some exceptions. --ANK |
| 1390 | */ |
| 1391 | err = -EINVAL; |
| 1392 | if (!(gwa_type & IPV6_ADDR_UNICAST)) |
| 1393 | goto out; |
| 1394 | |
| 1395 | grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1); |
| 1396 | |
| 1397 | err = -EHOSTUNREACH; |
| 1398 | if (!grt) |
| 1399 | goto out; |
| 1400 | if (dev) { |
| 1401 | if (dev != grt->dst.dev) { |
| 1402 | dst_release(&grt->dst); |
| 1403 | goto out; |
| 1404 | } |
| 1405 | } else { |
| 1406 | dev = grt->dst.dev; |
| 1407 | idev = grt->rt6i_idev; |
| 1408 | dev_hold(dev); |
| 1409 | in6_dev_hold(grt->rt6i_idev); |
| 1410 | } |
| 1411 | if (!(grt->rt6i_flags & RTF_GATEWAY)) |
| 1412 | err = 0; |
| 1413 | dst_release(&grt->dst); |
| 1414 | |
| 1415 | if (err) |
| 1416 | goto out; |
| 1417 | } |
| 1418 | err = -EINVAL; |
| 1419 | if (!dev || (dev->flags & IFF_LOOPBACK)) |
| 1420 | goto out; |
| 1421 | } |
| 1422 | |
| 1423 | err = -ENODEV; |
| 1424 | if (!dev) |
| 1425 | goto out; |
| 1426 | |
| 1427 | if (!ipv6_addr_any(&cfg->fc_prefsrc)) { |
| 1428 | if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) { |
| 1429 | err = -EINVAL; |
| 1430 | goto out; |
| 1431 | } |
| 1432 | rt->rt6i_prefsrc.addr = cfg->fc_prefsrc; |
| 1433 | rt->rt6i_prefsrc.plen = 128; |
| 1434 | } else |
| 1435 | rt->rt6i_prefsrc.plen = 0; |
| 1436 | |
| 1437 | if (cfg->fc_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) { |
| 1438 | err = rt6_bind_neighbour(rt, dev); |
| 1439 | if (err) |
| 1440 | goto out; |
| 1441 | } |
| 1442 | |
| 1443 | rt->rt6i_flags = cfg->fc_flags; |
| 1444 | |
| 1445 | install_route: |
| 1446 | if (cfg->fc_mx) { |
| 1447 | struct nlattr *nla; |
| 1448 | int remaining; |
| 1449 | |
| 1450 | nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) { |
| 1451 | int type = nla_type(nla); |
| 1452 | |
| 1453 | if (type) { |
| 1454 | if (type > RTAX_MAX) { |
| 1455 | err = -EINVAL; |
| 1456 | goto out; |
| 1457 | } |
| 1458 | |
| 1459 | dst_metric_set(&rt->dst, type, nla_get_u32(nla)); |
| 1460 | } |
| 1461 | } |
| 1462 | } |
| 1463 | |
| 1464 | rt->dst.dev = dev; |
| 1465 | rt->rt6i_idev = idev; |
| 1466 | rt->rt6i_table = table; |
| 1467 | |
| 1468 | cfg->fc_nlinfo.nl_net = dev_net(dev); |
| 1469 | |
| 1470 | return __ip6_ins_rt(rt, &cfg->fc_nlinfo); |
| 1471 | |
| 1472 | out: |
| 1473 | if (dev) |
| 1474 | dev_put(dev); |
| 1475 | if (idev) |
| 1476 | in6_dev_put(idev); |
| 1477 | if (rt) |
| 1478 | dst_free(&rt->dst); |
| 1479 | return err; |
| 1480 | } |
| 1481 | |
| 1482 | static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info) |
| 1483 | { |
| 1484 | int err; |
| 1485 | struct fib6_table *table; |
| 1486 | struct net *net = dev_net(rt->dst.dev); |
| 1487 | |
| 1488 | if (rt == net->ipv6.ip6_null_entry) |
| 1489 | return -ENOENT; |
| 1490 | |
| 1491 | table = rt->rt6i_table; |
| 1492 | write_lock_bh(&table->tb6_lock); |
| 1493 | |
| 1494 | err = fib6_del(rt, info); |
| 1495 | dst_release(&rt->dst); |
| 1496 | |
| 1497 | write_unlock_bh(&table->tb6_lock); |
| 1498 | |
| 1499 | return err; |
| 1500 | } |
| 1501 | |
| 1502 | int ip6_del_rt(struct rt6_info *rt) |
| 1503 | { |
| 1504 | struct nl_info info = { |
| 1505 | .nl_net = dev_net(rt->dst.dev), |
| 1506 | }; |
| 1507 | return __ip6_del_rt(rt, &info); |
| 1508 | } |
| 1509 | |
| 1510 | static int ip6_route_del(struct fib6_config *cfg) |
| 1511 | { |
| 1512 | struct fib6_table *table; |
| 1513 | struct fib6_node *fn; |
| 1514 | struct rt6_info *rt; |
| 1515 | int err = -ESRCH; |
| 1516 | |
| 1517 | table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table); |
| 1518 | if (!table) |
| 1519 | return err; |
| 1520 | |
| 1521 | read_lock_bh(&table->tb6_lock); |
| 1522 | |
| 1523 | fn = fib6_locate(&table->tb6_root, |
| 1524 | &cfg->fc_dst, cfg->fc_dst_len, |
| 1525 | &cfg->fc_src, cfg->fc_src_len); |
| 1526 | |
| 1527 | if (fn) { |
| 1528 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
| 1529 | if (cfg->fc_ifindex && |
| 1530 | (!rt->dst.dev || |
| 1531 | rt->dst.dev->ifindex != cfg->fc_ifindex)) |
| 1532 | continue; |
| 1533 | if (cfg->fc_flags & RTF_GATEWAY && |
| 1534 | !ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway)) |
| 1535 | continue; |
| 1536 | if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric) |
| 1537 | continue; |
| 1538 | dst_hold(&rt->dst); |
| 1539 | read_unlock_bh(&table->tb6_lock); |
| 1540 | |
| 1541 | return __ip6_del_rt(rt, &cfg->fc_nlinfo); |
| 1542 | } |
| 1543 | } |
| 1544 | read_unlock_bh(&table->tb6_lock); |
| 1545 | |
| 1546 | return err; |
| 1547 | } |
| 1548 | |
| 1549 | /* |
| 1550 | * Handle redirects |
| 1551 | */ |
| 1552 | struct ip6rd_flowi { |
| 1553 | struct flowi6 fl6; |
| 1554 | struct in6_addr gateway; |
| 1555 | }; |
| 1556 | |
| 1557 | static struct rt6_info *__ip6_route_redirect(struct net *net, |
| 1558 | struct fib6_table *table, |
| 1559 | struct flowi6 *fl6, |
| 1560 | int flags) |
| 1561 | { |
| 1562 | struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; |
| 1563 | struct rt6_info *rt; |
| 1564 | struct fib6_node *fn; |
| 1565 | |
| 1566 | /* |
| 1567 | * Get the "current" route for this destination and |
| 1568 | * check if the redirect has come from approriate router. |
| 1569 | * |
| 1570 | * RFC 2461 specifies that redirects should only be |
| 1571 | * accepted if they come from the nexthop to the target. |
| 1572 | * Due to the way the routes are chosen, this notion |
| 1573 | * is a bit fuzzy and one might need to check all possible |
| 1574 | * routes. |
| 1575 | */ |
| 1576 | |
| 1577 | read_lock_bh(&table->tb6_lock); |
| 1578 | fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); |
| 1579 | restart: |
| 1580 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
| 1581 | /* |
| 1582 | * Current route is on-link; redirect is always invalid. |
| 1583 | * |
| 1584 | * Seems, previous statement is not true. It could |
| 1585 | * be node, which looks for us as on-link (f.e. proxy ndisc) |
| 1586 | * But then router serving it might decide, that we should |
| 1587 | * know truth 8)8) --ANK (980726). |
| 1588 | */ |
| 1589 | if (rt6_check_expired(rt)) |
| 1590 | continue; |
| 1591 | if (!(rt->rt6i_flags & RTF_GATEWAY)) |
| 1592 | continue; |
| 1593 | if (fl6->flowi6_oif != rt->dst.dev->ifindex) |
| 1594 | continue; |
| 1595 | if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) |
| 1596 | continue; |
| 1597 | break; |
| 1598 | } |
| 1599 | |
| 1600 | if (!rt) |
| 1601 | rt = net->ipv6.ip6_null_entry; |
| 1602 | BACKTRACK(net, &fl6->saddr); |
| 1603 | out: |
| 1604 | dst_hold(&rt->dst); |
| 1605 | |
| 1606 | read_unlock_bh(&table->tb6_lock); |
| 1607 | |
| 1608 | return rt; |
| 1609 | }; |
| 1610 | |
| 1611 | static struct rt6_info *ip6_route_redirect(const struct in6_addr *dest, |
| 1612 | const struct in6_addr *src, |
| 1613 | const struct in6_addr *gateway, |
| 1614 | struct net_device *dev) |
| 1615 | { |
| 1616 | int flags = RT6_LOOKUP_F_HAS_SADDR; |
| 1617 | struct net *net = dev_net(dev); |
| 1618 | struct ip6rd_flowi rdfl = { |
| 1619 | .fl6 = { |
| 1620 | .flowi6_oif = dev->ifindex, |
| 1621 | .daddr = *dest, |
| 1622 | .saddr = *src, |
| 1623 | }, |
| 1624 | }; |
| 1625 | |
| 1626 | rdfl.gateway = *gateway; |
| 1627 | |
| 1628 | if (rt6_need_strict(dest)) |
| 1629 | flags |= RT6_LOOKUP_F_IFACE; |
| 1630 | |
| 1631 | return (struct rt6_info *)fib6_rule_lookup(net, &rdfl.fl6, |
| 1632 | flags, __ip6_route_redirect); |
| 1633 | } |
| 1634 | |
| 1635 | void rt6_redirect(const struct in6_addr *dest, const struct in6_addr *src, |
| 1636 | const struct in6_addr *saddr, |
| 1637 | struct neighbour *neigh, u8 *lladdr, int on_link) |
| 1638 | { |
| 1639 | struct rt6_info *rt, *nrt = NULL; |
| 1640 | struct netevent_redirect netevent; |
| 1641 | struct net *net = dev_net(neigh->dev); |
| 1642 | |
| 1643 | rt = ip6_route_redirect(dest, src, saddr, neigh->dev); |
| 1644 | |
| 1645 | if (rt == net->ipv6.ip6_null_entry) { |
| 1646 | net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n"); |
| 1647 | goto out; |
| 1648 | } |
| 1649 | |
| 1650 | /* |
| 1651 | * We have finally decided to accept it. |
| 1652 | */ |
| 1653 | |
| 1654 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1655 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1656 | NEIGH_UPDATE_F_OVERRIDE| |
| 1657 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1658 | NEIGH_UPDATE_F_ISROUTER)) |
| 1659 | ); |
| 1660 | |
| 1661 | /* |
| 1662 | * Redirect received -> path was valid. |
| 1663 | * Look, redirects are sent only in response to data packets, |
| 1664 | * so that this nexthop apparently is reachable. --ANK |
| 1665 | */ |
| 1666 | dst_confirm(&rt->dst); |
| 1667 | |
| 1668 | /* Duplicate redirect: silently ignore. */ |
| 1669 | if (neigh == dst_get_neighbour_noref_raw(&rt->dst)) |
| 1670 | goto out; |
| 1671 | |
| 1672 | nrt = ip6_rt_copy(rt, dest); |
| 1673 | if (!nrt) |
| 1674 | goto out; |
| 1675 | |
| 1676 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; |
| 1677 | if (on_link) |
| 1678 | nrt->rt6i_flags &= ~RTF_GATEWAY; |
| 1679 | |
| 1680 | nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key; |
| 1681 | dst_set_neighbour(&nrt->dst, neigh_clone(neigh)); |
| 1682 | |
| 1683 | if (ip6_ins_rt(nrt)) |
| 1684 | goto out; |
| 1685 | |
| 1686 | netevent.old = &rt->dst; |
| 1687 | netevent.new = &nrt->dst; |
| 1688 | call_netevent_notifiers(NETEVENT_REDIRECT, &netevent); |
| 1689 | |
| 1690 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1691 | ip6_del_rt(rt); |
| 1692 | return; |
| 1693 | } |
| 1694 | |
| 1695 | out: |
| 1696 | dst_release(&rt->dst); |
| 1697 | } |
| 1698 | |
| 1699 | /* |
| 1700 | * Handle ICMP "packet too big" messages |
| 1701 | * i.e. Path MTU discovery |
| 1702 | */ |
| 1703 | |
| 1704 | static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, |
| 1705 | struct net *net, u32 pmtu, int ifindex) |
| 1706 | { |
| 1707 | struct rt6_info *rt, *nrt; |
| 1708 | int allfrag = 0; |
| 1709 | again: |
| 1710 | rt = rt6_lookup(net, daddr, saddr, ifindex, 0); |
| 1711 | if (!rt) |
| 1712 | return; |
| 1713 | |
| 1714 | if (rt6_check_expired(rt)) { |
| 1715 | ip6_del_rt(rt); |
| 1716 | goto again; |
| 1717 | } |
| 1718 | |
| 1719 | if (pmtu >= dst_mtu(&rt->dst)) |
| 1720 | goto out; |
| 1721 | |
| 1722 | if (pmtu < IPV6_MIN_MTU) { |
| 1723 | /* |
| 1724 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
| 1725 | * MTU (1280) and a fragment header should always be included |
| 1726 | * after a node receiving Too Big message reporting PMTU is |
| 1727 | * less than the IPv6 Minimum Link MTU. |
| 1728 | */ |
| 1729 | pmtu = IPV6_MIN_MTU; |
| 1730 | allfrag = 1; |
| 1731 | } |
| 1732 | |
| 1733 | /* New mtu received -> path was valid. |
| 1734 | They are sent only in response to data packets, |
| 1735 | so that this nexthop apparently is reachable. --ANK |
| 1736 | */ |
| 1737 | dst_confirm(&rt->dst); |
| 1738 | |
| 1739 | /* Host route. If it is static, it would be better |
| 1740 | not to override it, but add new one, so that |
| 1741 | when cache entry will expire old pmtu |
| 1742 | would return automatically. |
| 1743 | */ |
| 1744 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1745 | dst_metric_set(&rt->dst, RTAX_MTU, pmtu); |
| 1746 | if (allfrag) { |
| 1747 | u32 features = dst_metric(&rt->dst, RTAX_FEATURES); |
| 1748 | features |= RTAX_FEATURE_ALLFRAG; |
| 1749 | dst_metric_set(&rt->dst, RTAX_FEATURES, features); |
| 1750 | } |
| 1751 | rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
| 1752 | rt->rt6i_flags |= RTF_MODIFIED; |
| 1753 | goto out; |
| 1754 | } |
| 1755 | |
| 1756 | /* Network route. |
| 1757 | Two cases are possible: |
| 1758 | 1. It is connected route. Action: COW |
| 1759 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. |
| 1760 | */ |
| 1761 | if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
| 1762 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
| 1763 | else |
| 1764 | nrt = rt6_alloc_clone(rt, daddr); |
| 1765 | |
| 1766 | if (nrt) { |
| 1767 | dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); |
| 1768 | if (allfrag) { |
| 1769 | u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); |
| 1770 | features |= RTAX_FEATURE_ALLFRAG; |
| 1771 | dst_metric_set(&nrt->dst, RTAX_FEATURES, features); |
| 1772 | } |
| 1773 | |
| 1774 | /* According to RFC 1981, detecting PMTU increase shouldn't be |
| 1775 | * happened within 5 mins, the recommended timer is 10 mins. |
| 1776 | * Here this route expiration time is set to ip6_rt_mtu_expires |
| 1777 | * which is 10 mins. After 10 mins the decreased pmtu is expired |
| 1778 | * and detecting PMTU increase will be automatically happened. |
| 1779 | */ |
| 1780 | rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires); |
| 1781 | nrt->rt6i_flags |= RTF_DYNAMIC; |
| 1782 | ip6_ins_rt(nrt); |
| 1783 | } |
| 1784 | out: |
| 1785 | dst_release(&rt->dst); |
| 1786 | } |
| 1787 | |
| 1788 | void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, |
| 1789 | struct net_device *dev, u32 pmtu) |
| 1790 | { |
| 1791 | struct net *net = dev_net(dev); |
| 1792 | |
| 1793 | /* |
| 1794 | * RFC 1981 states that a node "MUST reduce the size of the packets it |
| 1795 | * is sending along the path" that caused the Packet Too Big message. |
| 1796 | * Since it's not possible in the general case to determine which |
| 1797 | * interface was used to send the original packet, we update the MTU |
| 1798 | * on the interface that will be used to send future packets. We also |
| 1799 | * update the MTU on the interface that received the Packet Too Big in |
| 1800 | * case the original packet was forced out that interface with |
| 1801 | * SO_BINDTODEVICE or similar. This is the next best thing to the |
| 1802 | * correct behaviour, which would be to update the MTU on all |
| 1803 | * interfaces. |
| 1804 | */ |
| 1805 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); |
| 1806 | rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); |
| 1807 | } |
| 1808 | |
| 1809 | /* |
| 1810 | * Misc support functions |
| 1811 | */ |
| 1812 | |
| 1813 | static struct rt6_info *ip6_rt_copy(struct rt6_info *ort, |
| 1814 | const struct in6_addr *dest) |
| 1815 | { |
| 1816 | struct net *net = dev_net(ort->dst.dev); |
| 1817 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
| 1818 | ort->dst.dev, 0); |
| 1819 | |
| 1820 | if (rt) { |
| 1821 | rt->dst.input = ort->dst.input; |
| 1822 | rt->dst.output = ort->dst.output; |
| 1823 | rt->dst.flags |= DST_HOST; |
| 1824 | |
| 1825 | rt->rt6i_dst.addr = *dest; |
| 1826 | rt->rt6i_dst.plen = 128; |
| 1827 | dst_copy_metrics(&rt->dst, &ort->dst); |
| 1828 | rt->dst.error = ort->dst.error; |
| 1829 | rt->rt6i_idev = ort->rt6i_idev; |
| 1830 | if (rt->rt6i_idev) |
| 1831 | in6_dev_hold(rt->rt6i_idev); |
| 1832 | rt->dst.lastuse = jiffies; |
| 1833 | |
| 1834 | rt->rt6i_gateway = ort->rt6i_gateway; |
| 1835 | rt->rt6i_flags = ort->rt6i_flags; |
| 1836 | if ((ort->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) == |
| 1837 | (RTF_DEFAULT | RTF_ADDRCONF)) |
| 1838 | rt6_set_from(rt, ort); |
| 1839 | else |
| 1840 | rt6_clean_expires(rt); |
| 1841 | rt->rt6i_metric = 0; |
| 1842 | |
| 1843 | #ifdef CONFIG_IPV6_SUBTREES |
| 1844 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); |
| 1845 | #endif |
| 1846 | memcpy(&rt->rt6i_prefsrc, &ort->rt6i_prefsrc, sizeof(struct rt6key)); |
| 1847 | rt->rt6i_table = ort->rt6i_table; |
| 1848 | } |
| 1849 | return rt; |
| 1850 | } |
| 1851 | |
| 1852 | #ifdef CONFIG_IPV6_ROUTE_INFO |
| 1853 | static struct rt6_info *rt6_get_route_info(struct net *net, |
| 1854 | const struct in6_addr *prefix, int prefixlen, |
| 1855 | const struct in6_addr *gwaddr, int ifindex) |
| 1856 | { |
| 1857 | struct fib6_node *fn; |
| 1858 | struct rt6_info *rt = NULL; |
| 1859 | struct fib6_table *table; |
| 1860 | |
| 1861 | table = fib6_get_table(net, RT6_TABLE_INFO); |
| 1862 | if (!table) |
| 1863 | return NULL; |
| 1864 | |
| 1865 | write_lock_bh(&table->tb6_lock); |
| 1866 | fn = fib6_locate(&table->tb6_root, prefix ,prefixlen, NULL, 0); |
| 1867 | if (!fn) |
| 1868 | goto out; |
| 1869 | |
| 1870 | for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { |
| 1871 | if (rt->dst.dev->ifindex != ifindex) |
| 1872 | continue; |
| 1873 | if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY)) |
| 1874 | continue; |
| 1875 | if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr)) |
| 1876 | continue; |
| 1877 | dst_hold(&rt->dst); |
| 1878 | break; |
| 1879 | } |
| 1880 | out: |
| 1881 | write_unlock_bh(&table->tb6_lock); |
| 1882 | return rt; |
| 1883 | } |
| 1884 | |
| 1885 | static struct rt6_info *rt6_add_route_info(struct net *net, |
| 1886 | const struct in6_addr *prefix, int prefixlen, |
| 1887 | const struct in6_addr *gwaddr, int ifindex, |
| 1888 | unsigned int pref) |
| 1889 | { |
| 1890 | struct fib6_config cfg = { |
| 1891 | .fc_table = RT6_TABLE_INFO, |
| 1892 | .fc_metric = IP6_RT_PRIO_USER, |
| 1893 | .fc_ifindex = ifindex, |
| 1894 | .fc_dst_len = prefixlen, |
| 1895 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO | |
| 1896 | RTF_UP | RTF_PREF(pref), |
| 1897 | .fc_nlinfo.pid = 0, |
| 1898 | .fc_nlinfo.nlh = NULL, |
| 1899 | .fc_nlinfo.nl_net = net, |
| 1900 | }; |
| 1901 | |
| 1902 | cfg.fc_dst = *prefix; |
| 1903 | cfg.fc_gateway = *gwaddr; |
| 1904 | |
| 1905 | /* We should treat it as a default route if prefix length is 0. */ |
| 1906 | if (!prefixlen) |
| 1907 | cfg.fc_flags |= RTF_DEFAULT; |
| 1908 | |
| 1909 | ip6_route_add(&cfg); |
| 1910 | |
| 1911 | return rt6_get_route_info(net, prefix, prefixlen, gwaddr, ifindex); |
| 1912 | } |
| 1913 | #endif |
| 1914 | |
| 1915 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev) |
| 1916 | { |
| 1917 | struct rt6_info *rt; |
| 1918 | struct fib6_table *table; |
| 1919 | |
| 1920 | table = fib6_get_table(dev_net(dev), RT6_TABLE_DFLT); |
| 1921 | if (!table) |
| 1922 | return NULL; |
| 1923 | |
| 1924 | write_lock_bh(&table->tb6_lock); |
| 1925 | for (rt = table->tb6_root.leaf; rt; rt=rt->dst.rt6_next) { |
| 1926 | if (dev == rt->dst.dev && |
| 1927 | ((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) && |
| 1928 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
| 1929 | break; |
| 1930 | } |
| 1931 | if (rt) |
| 1932 | dst_hold(&rt->dst); |
| 1933 | write_unlock_bh(&table->tb6_lock); |
| 1934 | return rt; |
| 1935 | } |
| 1936 | |
| 1937 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
| 1938 | struct net_device *dev, |
| 1939 | unsigned int pref) |
| 1940 | { |
| 1941 | struct fib6_config cfg = { |
| 1942 | .fc_table = RT6_TABLE_DFLT, |
| 1943 | .fc_metric = IP6_RT_PRIO_USER, |
| 1944 | .fc_ifindex = dev->ifindex, |
| 1945 | .fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | |
| 1946 | RTF_UP | RTF_EXPIRES | RTF_PREF(pref), |
| 1947 | .fc_nlinfo.pid = 0, |
| 1948 | .fc_nlinfo.nlh = NULL, |
| 1949 | .fc_nlinfo.nl_net = dev_net(dev), |
| 1950 | }; |
| 1951 | |
| 1952 | cfg.fc_gateway = *gwaddr; |
| 1953 | |
| 1954 | ip6_route_add(&cfg); |
| 1955 | |
| 1956 | return rt6_get_dflt_router(gwaddr, dev); |
| 1957 | } |
| 1958 | |
| 1959 | void rt6_purge_dflt_routers(struct net *net) |
| 1960 | { |
| 1961 | struct rt6_info *rt; |
| 1962 | struct fib6_table *table; |
| 1963 | |
| 1964 | /* NOTE: Keep consistent with rt6_get_dflt_router */ |
| 1965 | table = fib6_get_table(net, RT6_TABLE_DFLT); |
| 1966 | if (!table) |
| 1967 | return; |
| 1968 | |
| 1969 | restart: |
| 1970 | read_lock_bh(&table->tb6_lock); |
| 1971 | for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) { |
| 1972 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
| 1973 | dst_hold(&rt->dst); |
| 1974 | read_unlock_bh(&table->tb6_lock); |
| 1975 | ip6_del_rt(rt); |
| 1976 | goto restart; |
| 1977 | } |
| 1978 | } |
| 1979 | read_unlock_bh(&table->tb6_lock); |
| 1980 | } |
| 1981 | |
| 1982 | static void rtmsg_to_fib6_config(struct net *net, |
| 1983 | struct in6_rtmsg *rtmsg, |
| 1984 | struct fib6_config *cfg) |
| 1985 | { |
| 1986 | memset(cfg, 0, sizeof(*cfg)); |
| 1987 | |
| 1988 | cfg->fc_table = RT6_TABLE_MAIN; |
| 1989 | cfg->fc_ifindex = rtmsg->rtmsg_ifindex; |
| 1990 | cfg->fc_metric = rtmsg->rtmsg_metric; |
| 1991 | cfg->fc_expires = rtmsg->rtmsg_info; |
| 1992 | cfg->fc_dst_len = rtmsg->rtmsg_dst_len; |
| 1993 | cfg->fc_src_len = rtmsg->rtmsg_src_len; |
| 1994 | cfg->fc_flags = rtmsg->rtmsg_flags; |
| 1995 | |
| 1996 | cfg->fc_nlinfo.nl_net = net; |
| 1997 | |
| 1998 | cfg->fc_dst = rtmsg->rtmsg_dst; |
| 1999 | cfg->fc_src = rtmsg->rtmsg_src; |
| 2000 | cfg->fc_gateway = rtmsg->rtmsg_gateway; |
| 2001 | } |
| 2002 | |
| 2003 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
| 2004 | { |
| 2005 | struct fib6_config cfg; |
| 2006 | struct in6_rtmsg rtmsg; |
| 2007 | int err; |
| 2008 | |
| 2009 | switch(cmd) { |
| 2010 | case SIOCADDRT: /* Add a route */ |
| 2011 | case SIOCDELRT: /* Delete a route */ |
| 2012 | if (!capable(CAP_NET_ADMIN)) |
| 2013 | return -EPERM; |
| 2014 | err = copy_from_user(&rtmsg, arg, |
| 2015 | sizeof(struct in6_rtmsg)); |
| 2016 | if (err) |
| 2017 | return -EFAULT; |
| 2018 | |
| 2019 | rtmsg_to_fib6_config(net, &rtmsg, &cfg); |
| 2020 | |
| 2021 | rtnl_lock(); |
| 2022 | switch (cmd) { |
| 2023 | case SIOCADDRT: |
| 2024 | err = ip6_route_add(&cfg); |
| 2025 | break; |
| 2026 | case SIOCDELRT: |
| 2027 | err = ip6_route_del(&cfg); |
| 2028 | break; |
| 2029 | default: |
| 2030 | err = -EINVAL; |
| 2031 | } |
| 2032 | rtnl_unlock(); |
| 2033 | |
| 2034 | return err; |
| 2035 | } |
| 2036 | |
| 2037 | return -EINVAL; |
| 2038 | } |
| 2039 | |
| 2040 | /* |
| 2041 | * Drop the packet on the floor |
| 2042 | */ |
| 2043 | |
| 2044 | static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes) |
| 2045 | { |
| 2046 | int type; |
| 2047 | struct dst_entry *dst = skb_dst(skb); |
| 2048 | switch (ipstats_mib_noroutes) { |
| 2049 | case IPSTATS_MIB_INNOROUTES: |
| 2050 | type = ipv6_addr_type(&ipv6_hdr(skb)->daddr); |
| 2051 | if (type == IPV6_ADDR_ANY) { |
| 2052 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
| 2053 | IPSTATS_MIB_INADDRERRORS); |
| 2054 | break; |
| 2055 | } |
| 2056 | /* FALLTHROUGH */ |
| 2057 | case IPSTATS_MIB_OUTNOROUTES: |
| 2058 | IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst), |
| 2059 | ipstats_mib_noroutes); |
| 2060 | break; |
| 2061 | } |
| 2062 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0); |
| 2063 | kfree_skb(skb); |
| 2064 | return 0; |
| 2065 | } |
| 2066 | |
| 2067 | static int ip6_pkt_discard(struct sk_buff *skb) |
| 2068 | { |
| 2069 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES); |
| 2070 | } |
| 2071 | |
| 2072 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
| 2073 | { |
| 2074 | skb->dev = skb_dst(skb)->dev; |
| 2075 | return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES); |
| 2076 | } |
| 2077 | |
| 2078 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2079 | |
| 2080 | static int ip6_pkt_prohibit(struct sk_buff *skb) |
| 2081 | { |
| 2082 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES); |
| 2083 | } |
| 2084 | |
| 2085 | static int ip6_pkt_prohibit_out(struct sk_buff *skb) |
| 2086 | { |
| 2087 | skb->dev = skb_dst(skb)->dev; |
| 2088 | return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES); |
| 2089 | } |
| 2090 | |
| 2091 | #endif |
| 2092 | |
| 2093 | /* |
| 2094 | * Allocate a dst for local (unicast / anycast) address. |
| 2095 | */ |
| 2096 | |
| 2097 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, |
| 2098 | const struct in6_addr *addr, |
| 2099 | bool anycast) |
| 2100 | { |
| 2101 | struct net *net = dev_net(idev->dev); |
| 2102 | struct rt6_info *rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops, |
| 2103 | net->loopback_dev, 0); |
| 2104 | int err; |
| 2105 | |
| 2106 | if (!rt) { |
| 2107 | net_warn_ratelimited("Maximum number of routes reached, consider increasing route/max_size\n"); |
| 2108 | return ERR_PTR(-ENOMEM); |
| 2109 | } |
| 2110 | |
| 2111 | in6_dev_hold(idev); |
| 2112 | |
| 2113 | rt->dst.flags |= DST_HOST; |
| 2114 | rt->dst.input = ip6_input; |
| 2115 | rt->dst.output = ip6_output; |
| 2116 | rt->rt6i_idev = idev; |
| 2117 | rt->dst.obsolete = -1; |
| 2118 | |
| 2119 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
| 2120 | if (anycast) |
| 2121 | rt->rt6i_flags |= RTF_ANYCAST; |
| 2122 | else |
| 2123 | rt->rt6i_flags |= RTF_LOCAL; |
| 2124 | err = rt6_bind_neighbour(rt, rt->dst.dev); |
| 2125 | if (err) { |
| 2126 | dst_free(&rt->dst); |
| 2127 | return ERR_PTR(err); |
| 2128 | } |
| 2129 | |
| 2130 | rt->rt6i_dst.addr = *addr; |
| 2131 | rt->rt6i_dst.plen = 128; |
| 2132 | rt->rt6i_table = fib6_get_table(net, RT6_TABLE_LOCAL); |
| 2133 | |
| 2134 | atomic_set(&rt->dst.__refcnt, 1); |
| 2135 | |
| 2136 | return rt; |
| 2137 | } |
| 2138 | |
| 2139 | int ip6_route_get_saddr(struct net *net, |
| 2140 | struct rt6_info *rt, |
| 2141 | const struct in6_addr *daddr, |
| 2142 | unsigned int prefs, |
| 2143 | struct in6_addr *saddr) |
| 2144 | { |
| 2145 | struct inet6_dev *idev = ip6_dst_idev((struct dst_entry*)rt); |
| 2146 | int err = 0; |
| 2147 | if (rt->rt6i_prefsrc.plen) |
| 2148 | *saddr = rt->rt6i_prefsrc.addr; |
| 2149 | else |
| 2150 | err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, |
| 2151 | daddr, prefs, saddr); |
| 2152 | return err; |
| 2153 | } |
| 2154 | |
| 2155 | /* remove deleted ip from prefsrc entries */ |
| 2156 | struct arg_dev_net_ip { |
| 2157 | struct net_device *dev; |
| 2158 | struct net *net; |
| 2159 | struct in6_addr *addr; |
| 2160 | }; |
| 2161 | |
| 2162 | static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg) |
| 2163 | { |
| 2164 | struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev; |
| 2165 | struct net *net = ((struct arg_dev_net_ip *)arg)->net; |
| 2166 | struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr; |
| 2167 | |
| 2168 | if (((void *)rt->dst.dev == dev || !dev) && |
| 2169 | rt != net->ipv6.ip6_null_entry && |
| 2170 | ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) { |
| 2171 | /* remove prefsrc entry */ |
| 2172 | rt->rt6i_prefsrc.plen = 0; |
| 2173 | } |
| 2174 | return 0; |
| 2175 | } |
| 2176 | |
| 2177 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp) |
| 2178 | { |
| 2179 | struct net *net = dev_net(ifp->idev->dev); |
| 2180 | struct arg_dev_net_ip adni = { |
| 2181 | .dev = ifp->idev->dev, |
| 2182 | .net = net, |
| 2183 | .addr = &ifp->addr, |
| 2184 | }; |
| 2185 | fib6_clean_all(net, fib6_remove_prefsrc, 0, &adni); |
| 2186 | } |
| 2187 | |
| 2188 | struct arg_dev_net { |
| 2189 | struct net_device *dev; |
| 2190 | struct net *net; |
| 2191 | }; |
| 2192 | |
| 2193 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
| 2194 | { |
| 2195 | const struct arg_dev_net *adn = arg; |
| 2196 | const struct net_device *dev = adn->dev; |
| 2197 | |
| 2198 | if ((rt->dst.dev == dev || !dev) && |
| 2199 | rt != adn->net->ipv6.ip6_null_entry) |
| 2200 | return -1; |
| 2201 | |
| 2202 | return 0; |
| 2203 | } |
| 2204 | |
| 2205 | void rt6_ifdown(struct net *net, struct net_device *dev) |
| 2206 | { |
| 2207 | struct arg_dev_net adn = { |
| 2208 | .dev = dev, |
| 2209 | .net = net, |
| 2210 | }; |
| 2211 | |
| 2212 | fib6_clean_all(net, fib6_ifdown, 0, &adn); |
| 2213 | icmp6_clean_all(fib6_ifdown, &adn); |
| 2214 | } |
| 2215 | |
| 2216 | struct rt6_mtu_change_arg { |
| 2217 | struct net_device *dev; |
| 2218 | unsigned int mtu; |
| 2219 | }; |
| 2220 | |
| 2221 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) |
| 2222 | { |
| 2223 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; |
| 2224 | struct inet6_dev *idev; |
| 2225 | |
| 2226 | /* In IPv6 pmtu discovery is not optional, |
| 2227 | so that RTAX_MTU lock cannot disable it. |
| 2228 | We still use this lock to block changes |
| 2229 | caused by addrconf/ndisc. |
| 2230 | */ |
| 2231 | |
| 2232 | idev = __in6_dev_get(arg->dev); |
| 2233 | if (!idev) |
| 2234 | return 0; |
| 2235 | |
| 2236 | /* For administrative MTU increase, there is no way to discover |
| 2237 | IPv6 PMTU increase, so PMTU increase should be updated here. |
| 2238 | Since RFC 1981 doesn't include administrative MTU increase |
| 2239 | update PMTU increase is a MUST. (i.e. jumbo frame) |
| 2240 | */ |
| 2241 | /* |
| 2242 | If new MTU is less than route PMTU, this new MTU will be the |
| 2243 | lowest MTU in the path, update the route PMTU to reflect PMTU |
| 2244 | decreases; if new MTU is greater than route PMTU, and the |
| 2245 | old MTU is the lowest MTU in the path, update the route PMTU |
| 2246 | to reflect the increase. In this case if the other nodes' MTU |
| 2247 | also have the lowest MTU, TOO BIG MESSAGE will be lead to |
| 2248 | PMTU discouvery. |
| 2249 | */ |
| 2250 | if (rt->dst.dev == arg->dev && |
| 2251 | !dst_metric_locked(&rt->dst, RTAX_MTU) && |
| 2252 | (dst_mtu(&rt->dst) >= arg->mtu || |
| 2253 | (dst_mtu(&rt->dst) < arg->mtu && |
| 2254 | dst_mtu(&rt->dst) == idev->cnf.mtu6))) { |
| 2255 | dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu); |
| 2256 | } |
| 2257 | return 0; |
| 2258 | } |
| 2259 | |
| 2260 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu) |
| 2261 | { |
| 2262 | struct rt6_mtu_change_arg arg = { |
| 2263 | .dev = dev, |
| 2264 | .mtu = mtu, |
| 2265 | }; |
| 2266 | |
| 2267 | fib6_clean_all(dev_net(dev), rt6_mtu_change_route, 0, &arg); |
| 2268 | } |
| 2269 | |
| 2270 | static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { |
| 2271 | [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, |
| 2272 | [RTA_OIF] = { .type = NLA_U32 }, |
| 2273 | [RTA_IIF] = { .type = NLA_U32 }, |
| 2274 | [RTA_PRIORITY] = { .type = NLA_U32 }, |
| 2275 | [RTA_METRICS] = { .type = NLA_NESTED }, |
| 2276 | }; |
| 2277 | |
| 2278 | static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh, |
| 2279 | struct fib6_config *cfg) |
| 2280 | { |
| 2281 | struct rtmsg *rtm; |
| 2282 | struct nlattr *tb[RTA_MAX+1]; |
| 2283 | int err; |
| 2284 | |
| 2285 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
| 2286 | if (err < 0) |
| 2287 | goto errout; |
| 2288 | |
| 2289 | err = -EINVAL; |
| 2290 | rtm = nlmsg_data(nlh); |
| 2291 | memset(cfg, 0, sizeof(*cfg)); |
| 2292 | |
| 2293 | cfg->fc_table = rtm->rtm_table; |
| 2294 | cfg->fc_dst_len = rtm->rtm_dst_len; |
| 2295 | cfg->fc_src_len = rtm->rtm_src_len; |
| 2296 | cfg->fc_flags = RTF_UP; |
| 2297 | cfg->fc_protocol = rtm->rtm_protocol; |
| 2298 | |
| 2299 | if (rtm->rtm_type == RTN_UNREACHABLE) |
| 2300 | cfg->fc_flags |= RTF_REJECT; |
| 2301 | |
| 2302 | if (rtm->rtm_type == RTN_LOCAL) |
| 2303 | cfg->fc_flags |= RTF_LOCAL; |
| 2304 | |
| 2305 | cfg->fc_nlinfo.pid = NETLINK_CB(skb).pid; |
| 2306 | cfg->fc_nlinfo.nlh = nlh; |
| 2307 | cfg->fc_nlinfo.nl_net = sock_net(skb->sk); |
| 2308 | |
| 2309 | if (tb[RTA_GATEWAY]) { |
| 2310 | nla_memcpy(&cfg->fc_gateway, tb[RTA_GATEWAY], 16); |
| 2311 | cfg->fc_flags |= RTF_GATEWAY; |
| 2312 | } |
| 2313 | |
| 2314 | if (tb[RTA_DST]) { |
| 2315 | int plen = (rtm->rtm_dst_len + 7) >> 3; |
| 2316 | |
| 2317 | if (nla_len(tb[RTA_DST]) < plen) |
| 2318 | goto errout; |
| 2319 | |
| 2320 | nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen); |
| 2321 | } |
| 2322 | |
| 2323 | if (tb[RTA_SRC]) { |
| 2324 | int plen = (rtm->rtm_src_len + 7) >> 3; |
| 2325 | |
| 2326 | if (nla_len(tb[RTA_SRC]) < plen) |
| 2327 | goto errout; |
| 2328 | |
| 2329 | nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen); |
| 2330 | } |
| 2331 | |
| 2332 | if (tb[RTA_PREFSRC]) |
| 2333 | nla_memcpy(&cfg->fc_prefsrc, tb[RTA_PREFSRC], 16); |
| 2334 | |
| 2335 | if (tb[RTA_OIF]) |
| 2336 | cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]); |
| 2337 | |
| 2338 | if (tb[RTA_PRIORITY]) |
| 2339 | cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]); |
| 2340 | |
| 2341 | if (tb[RTA_METRICS]) { |
| 2342 | cfg->fc_mx = nla_data(tb[RTA_METRICS]); |
| 2343 | cfg->fc_mx_len = nla_len(tb[RTA_METRICS]); |
| 2344 | } |
| 2345 | |
| 2346 | if (tb[RTA_TABLE]) |
| 2347 | cfg->fc_table = nla_get_u32(tb[RTA_TABLE]); |
| 2348 | |
| 2349 | err = 0; |
| 2350 | errout: |
| 2351 | return err; |
| 2352 | } |
| 2353 | |
| 2354 | static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 2355 | { |
| 2356 | struct fib6_config cfg; |
| 2357 | int err; |
| 2358 | |
| 2359 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
| 2360 | if (err < 0) |
| 2361 | return err; |
| 2362 | |
| 2363 | return ip6_route_del(&cfg); |
| 2364 | } |
| 2365 | |
| 2366 | static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 2367 | { |
| 2368 | struct fib6_config cfg; |
| 2369 | int err; |
| 2370 | |
| 2371 | err = rtm_to_fib6_config(skb, nlh, &cfg); |
| 2372 | if (err < 0) |
| 2373 | return err; |
| 2374 | |
| 2375 | return ip6_route_add(&cfg); |
| 2376 | } |
| 2377 | |
| 2378 | static inline size_t rt6_nlmsg_size(void) |
| 2379 | { |
| 2380 | return NLMSG_ALIGN(sizeof(struct rtmsg)) |
| 2381 | + nla_total_size(16) /* RTA_SRC */ |
| 2382 | + nla_total_size(16) /* RTA_DST */ |
| 2383 | + nla_total_size(16) /* RTA_GATEWAY */ |
| 2384 | + nla_total_size(16) /* RTA_PREFSRC */ |
| 2385 | + nla_total_size(4) /* RTA_TABLE */ |
| 2386 | + nla_total_size(4) /* RTA_IIF */ |
| 2387 | + nla_total_size(4) /* RTA_OIF */ |
| 2388 | + nla_total_size(4) /* RTA_PRIORITY */ |
| 2389 | + RTAX_MAX * nla_total_size(4) /* RTA_METRICS */ |
| 2390 | + nla_total_size(sizeof(struct rta_cacheinfo)); |
| 2391 | } |
| 2392 | |
| 2393 | static int rt6_fill_node(struct net *net, |
| 2394 | struct sk_buff *skb, struct rt6_info *rt, |
| 2395 | struct in6_addr *dst, struct in6_addr *src, |
| 2396 | int iif, int type, u32 pid, u32 seq, |
| 2397 | int prefix, int nowait, unsigned int flags) |
| 2398 | { |
| 2399 | const struct inet_peer *peer; |
| 2400 | struct rtmsg *rtm; |
| 2401 | struct nlmsghdr *nlh; |
| 2402 | long expires; |
| 2403 | u32 table; |
| 2404 | struct neighbour *n; |
| 2405 | u32 ts, tsage; |
| 2406 | |
| 2407 | if (prefix) { /* user wants prefix routes only */ |
| 2408 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { |
| 2409 | /* success since this is not a prefix route */ |
| 2410 | return 1; |
| 2411 | } |
| 2412 | } |
| 2413 | |
| 2414 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*rtm), flags); |
| 2415 | if (!nlh) |
| 2416 | return -EMSGSIZE; |
| 2417 | |
| 2418 | rtm = nlmsg_data(nlh); |
| 2419 | rtm->rtm_family = AF_INET6; |
| 2420 | rtm->rtm_dst_len = rt->rt6i_dst.plen; |
| 2421 | rtm->rtm_src_len = rt->rt6i_src.plen; |
| 2422 | rtm->rtm_tos = 0; |
| 2423 | if (rt->rt6i_table) |
| 2424 | table = rt->rt6i_table->tb6_id; |
| 2425 | else |
| 2426 | table = RT6_TABLE_UNSPEC; |
| 2427 | rtm->rtm_table = table; |
| 2428 | if (nla_put_u32(skb, RTA_TABLE, table)) |
| 2429 | goto nla_put_failure; |
| 2430 | if (rt->rt6i_flags & RTF_REJECT) |
| 2431 | rtm->rtm_type = RTN_UNREACHABLE; |
| 2432 | else if (rt->rt6i_flags & RTF_LOCAL) |
| 2433 | rtm->rtm_type = RTN_LOCAL; |
| 2434 | else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK)) |
| 2435 | rtm->rtm_type = RTN_LOCAL; |
| 2436 | else |
| 2437 | rtm->rtm_type = RTN_UNICAST; |
| 2438 | rtm->rtm_flags = 0; |
| 2439 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 2440 | rtm->rtm_protocol = rt->rt6i_protocol; |
| 2441 | if (rt->rt6i_flags & RTF_DYNAMIC) |
| 2442 | rtm->rtm_protocol = RTPROT_REDIRECT; |
| 2443 | else if (rt->rt6i_flags & RTF_ADDRCONF) |
| 2444 | rtm->rtm_protocol = RTPROT_KERNEL; |
| 2445 | else if (rt->rt6i_flags & RTF_DEFAULT) |
| 2446 | rtm->rtm_protocol = RTPROT_RA; |
| 2447 | |
| 2448 | if (rt->rt6i_flags & RTF_CACHE) |
| 2449 | rtm->rtm_flags |= RTM_F_CLONED; |
| 2450 | |
| 2451 | if (dst) { |
| 2452 | if (nla_put(skb, RTA_DST, 16, dst)) |
| 2453 | goto nla_put_failure; |
| 2454 | rtm->rtm_dst_len = 128; |
| 2455 | } else if (rtm->rtm_dst_len) |
| 2456 | if (nla_put(skb, RTA_DST, 16, &rt->rt6i_dst.addr)) |
| 2457 | goto nla_put_failure; |
| 2458 | #ifdef CONFIG_IPV6_SUBTREES |
| 2459 | if (src) { |
| 2460 | if (nla_put(skb, RTA_SRC, 16, src)) |
| 2461 | goto nla_put_failure; |
| 2462 | rtm->rtm_src_len = 128; |
| 2463 | } else if (rtm->rtm_src_len && |
| 2464 | nla_put(skb, RTA_SRC, 16, &rt->rt6i_src.addr)) |
| 2465 | goto nla_put_failure; |
| 2466 | #endif |
| 2467 | if (iif) { |
| 2468 | #ifdef CONFIG_IPV6_MROUTE |
| 2469 | if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) { |
| 2470 | int err = ip6mr_get_route(net, skb, rtm, nowait); |
| 2471 | if (err <= 0) { |
| 2472 | if (!nowait) { |
| 2473 | if (err == 0) |
| 2474 | return 0; |
| 2475 | goto nla_put_failure; |
| 2476 | } else { |
| 2477 | if (err == -EMSGSIZE) |
| 2478 | goto nla_put_failure; |
| 2479 | } |
| 2480 | } |
| 2481 | } else |
| 2482 | #endif |
| 2483 | if (nla_put_u32(skb, RTA_IIF, iif)) |
| 2484 | goto nla_put_failure; |
| 2485 | } else if (dst) { |
| 2486 | struct in6_addr saddr_buf; |
| 2487 | if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 && |
| 2488 | nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
| 2489 | goto nla_put_failure; |
| 2490 | } |
| 2491 | |
| 2492 | if (rt->rt6i_prefsrc.plen) { |
| 2493 | struct in6_addr saddr_buf; |
| 2494 | saddr_buf = rt->rt6i_prefsrc.addr; |
| 2495 | if (nla_put(skb, RTA_PREFSRC, 16, &saddr_buf)) |
| 2496 | goto nla_put_failure; |
| 2497 | } |
| 2498 | |
| 2499 | if (rtnetlink_put_metrics(skb, dst_metrics_ptr(&rt->dst)) < 0) |
| 2500 | goto nla_put_failure; |
| 2501 | |
| 2502 | rcu_read_lock(); |
| 2503 | n = dst_get_neighbour_noref(&rt->dst); |
| 2504 | if (n) { |
| 2505 | if (nla_put(skb, RTA_GATEWAY, 16, &n->primary_key) < 0) { |
| 2506 | rcu_read_unlock(); |
| 2507 | goto nla_put_failure; |
| 2508 | } |
| 2509 | } |
| 2510 | rcu_read_unlock(); |
| 2511 | |
| 2512 | if (rt->dst.dev && |
| 2513 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) |
| 2514 | goto nla_put_failure; |
| 2515 | if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric)) |
| 2516 | goto nla_put_failure; |
| 2517 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
| 2518 | expires = 0; |
| 2519 | else if (rt->dst.expires - jiffies < INT_MAX) |
| 2520 | expires = rt->dst.expires - jiffies; |
| 2521 | else |
| 2522 | expires = INT_MAX; |
| 2523 | |
| 2524 | peer = rt->rt6i_peer; |
| 2525 | ts = tsage = 0; |
| 2526 | if (peer && peer->tcp_ts_stamp) { |
| 2527 | ts = peer->tcp_ts; |
| 2528 | tsage = get_seconds() - peer->tcp_ts_stamp; |
| 2529 | } |
| 2530 | |
| 2531 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage, |
| 2532 | expires, rt->dst.error) < 0) |
| 2533 | goto nla_put_failure; |
| 2534 | |
| 2535 | return nlmsg_end(skb, nlh); |
| 2536 | |
| 2537 | nla_put_failure: |
| 2538 | nlmsg_cancel(skb, nlh); |
| 2539 | return -EMSGSIZE; |
| 2540 | } |
| 2541 | |
| 2542 | int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
| 2543 | { |
| 2544 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; |
| 2545 | int prefix; |
| 2546 | |
| 2547 | if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) { |
| 2548 | struct rtmsg *rtm = nlmsg_data(arg->cb->nlh); |
| 2549 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
| 2550 | } else |
| 2551 | prefix = 0; |
| 2552 | |
| 2553 | return rt6_fill_node(arg->net, |
| 2554 | arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
| 2555 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
| 2556 | prefix, 0, NLM_F_MULTI); |
| 2557 | } |
| 2558 | |
| 2559 | static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
| 2560 | { |
| 2561 | struct net *net = sock_net(in_skb->sk); |
| 2562 | struct nlattr *tb[RTA_MAX+1]; |
| 2563 | struct rt6_info *rt; |
| 2564 | struct sk_buff *skb; |
| 2565 | struct rtmsg *rtm; |
| 2566 | struct flowi6 fl6; |
| 2567 | int err, iif = 0, oif = 0; |
| 2568 | |
| 2569 | err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy); |
| 2570 | if (err < 0) |
| 2571 | goto errout; |
| 2572 | |
| 2573 | err = -EINVAL; |
| 2574 | memset(&fl6, 0, sizeof(fl6)); |
| 2575 | |
| 2576 | if (tb[RTA_SRC]) { |
| 2577 | if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr)) |
| 2578 | goto errout; |
| 2579 | |
| 2580 | fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]); |
| 2581 | } |
| 2582 | |
| 2583 | if (tb[RTA_DST]) { |
| 2584 | if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr)) |
| 2585 | goto errout; |
| 2586 | |
| 2587 | fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]); |
| 2588 | } |
| 2589 | |
| 2590 | if (tb[RTA_IIF]) |
| 2591 | iif = nla_get_u32(tb[RTA_IIF]); |
| 2592 | |
| 2593 | if (tb[RTA_OIF]) |
| 2594 | oif = nla_get_u32(tb[RTA_OIF]); |
| 2595 | |
| 2596 | if (iif) { |
| 2597 | struct net_device *dev; |
| 2598 | int flags = 0; |
| 2599 | |
| 2600 | dev = __dev_get_by_index(net, iif); |
| 2601 | if (!dev) { |
| 2602 | err = -ENODEV; |
| 2603 | goto errout; |
| 2604 | } |
| 2605 | |
| 2606 | fl6.flowi6_iif = iif; |
| 2607 | |
| 2608 | if (!ipv6_addr_any(&fl6.saddr)) |
| 2609 | flags |= RT6_LOOKUP_F_HAS_SADDR; |
| 2610 | |
| 2611 | rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6, |
| 2612 | flags); |
| 2613 | } else { |
| 2614 | fl6.flowi6_oif = oif; |
| 2615 | |
| 2616 | rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6); |
| 2617 | } |
| 2618 | |
| 2619 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 2620 | if (!skb) { |
| 2621 | dst_release(&rt->dst); |
| 2622 | err = -ENOBUFS; |
| 2623 | goto errout; |
| 2624 | } |
| 2625 | |
| 2626 | /* Reserve room for dummy headers, this skb can pass |
| 2627 | through good chunk of routing engine. |
| 2628 | */ |
| 2629 | skb_reset_mac_header(skb); |
| 2630 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
| 2631 | |
| 2632 | skb_dst_set(skb, &rt->dst); |
| 2633 | |
| 2634 | err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif, |
| 2635 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
| 2636 | nlh->nlmsg_seq, 0, 0, 0); |
| 2637 | if (err < 0) { |
| 2638 | kfree_skb(skb); |
| 2639 | goto errout; |
| 2640 | } |
| 2641 | |
| 2642 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid); |
| 2643 | errout: |
| 2644 | return err; |
| 2645 | } |
| 2646 | |
| 2647 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info) |
| 2648 | { |
| 2649 | struct sk_buff *skb; |
| 2650 | struct net *net = info->nl_net; |
| 2651 | u32 seq; |
| 2652 | int err; |
| 2653 | |
| 2654 | err = -ENOBUFS; |
| 2655 | seq = info->nlh ? info->nlh->nlmsg_seq : 0; |
| 2656 | |
| 2657 | skb = nlmsg_new(rt6_nlmsg_size(), gfp_any()); |
| 2658 | if (!skb) |
| 2659 | goto errout; |
| 2660 | |
| 2661 | err = rt6_fill_node(net, skb, rt, NULL, NULL, 0, |
| 2662 | event, info->pid, seq, 0, 0, 0); |
| 2663 | if (err < 0) { |
| 2664 | /* -EMSGSIZE implies BUG in rt6_nlmsg_size() */ |
| 2665 | WARN_ON(err == -EMSGSIZE); |
| 2666 | kfree_skb(skb); |
| 2667 | goto errout; |
| 2668 | } |
| 2669 | rtnl_notify(skb, net, info->pid, RTNLGRP_IPV6_ROUTE, |
| 2670 | info->nlh, gfp_any()); |
| 2671 | return; |
| 2672 | errout: |
| 2673 | if (err < 0) |
| 2674 | rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err); |
| 2675 | } |
| 2676 | |
| 2677 | static int ip6_route_dev_notify(struct notifier_block *this, |
| 2678 | unsigned long event, void *data) |
| 2679 | { |
| 2680 | struct net_device *dev = (struct net_device *)data; |
| 2681 | struct net *net = dev_net(dev); |
| 2682 | |
| 2683 | if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { |
| 2684 | net->ipv6.ip6_null_entry->dst.dev = dev; |
| 2685 | net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); |
| 2686 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2687 | net->ipv6.ip6_prohibit_entry->dst.dev = dev; |
| 2688 | net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); |
| 2689 | net->ipv6.ip6_blk_hole_entry->dst.dev = dev; |
| 2690 | net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); |
| 2691 | #endif |
| 2692 | } |
| 2693 | |
| 2694 | return NOTIFY_OK; |
| 2695 | } |
| 2696 | |
| 2697 | /* |
| 2698 | * /proc |
| 2699 | */ |
| 2700 | |
| 2701 | #ifdef CONFIG_PROC_FS |
| 2702 | |
| 2703 | struct rt6_proc_arg |
| 2704 | { |
| 2705 | char *buffer; |
| 2706 | int offset; |
| 2707 | int length; |
| 2708 | int skip; |
| 2709 | int len; |
| 2710 | }; |
| 2711 | |
| 2712 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) |
| 2713 | { |
| 2714 | struct seq_file *m = p_arg; |
| 2715 | struct neighbour *n; |
| 2716 | |
| 2717 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); |
| 2718 | |
| 2719 | #ifdef CONFIG_IPV6_SUBTREES |
| 2720 | seq_printf(m, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); |
| 2721 | #else |
| 2722 | seq_puts(m, "00000000000000000000000000000000 00 "); |
| 2723 | #endif |
| 2724 | rcu_read_lock(); |
| 2725 | n = dst_get_neighbour_noref(&rt->dst); |
| 2726 | if (n) { |
| 2727 | seq_printf(m, "%pi6", n->primary_key); |
| 2728 | } else { |
| 2729 | seq_puts(m, "00000000000000000000000000000000"); |
| 2730 | } |
| 2731 | rcu_read_unlock(); |
| 2732 | seq_printf(m, " %08x %08x %08x %08x %8s\n", |
| 2733 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), |
| 2734 | rt->dst.__use, rt->rt6i_flags, |
| 2735 | rt->dst.dev ? rt->dst.dev->name : ""); |
| 2736 | return 0; |
| 2737 | } |
| 2738 | |
| 2739 | static int ipv6_route_show(struct seq_file *m, void *v) |
| 2740 | { |
| 2741 | struct net *net = (struct net *)m->private; |
| 2742 | fib6_clean_all_ro(net, rt6_info_route, 0, m); |
| 2743 | return 0; |
| 2744 | } |
| 2745 | |
| 2746 | static int ipv6_route_open(struct inode *inode, struct file *file) |
| 2747 | { |
| 2748 | return single_open_net(inode, file, ipv6_route_show); |
| 2749 | } |
| 2750 | |
| 2751 | static const struct file_operations ipv6_route_proc_fops = { |
| 2752 | .owner = THIS_MODULE, |
| 2753 | .open = ipv6_route_open, |
| 2754 | .read = seq_read, |
| 2755 | .llseek = seq_lseek, |
| 2756 | .release = single_release_net, |
| 2757 | }; |
| 2758 | |
| 2759 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
| 2760 | { |
| 2761 | struct net *net = (struct net *)seq->private; |
| 2762 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
| 2763 | net->ipv6.rt6_stats->fib_nodes, |
| 2764 | net->ipv6.rt6_stats->fib_route_nodes, |
| 2765 | net->ipv6.rt6_stats->fib_rt_alloc, |
| 2766 | net->ipv6.rt6_stats->fib_rt_entries, |
| 2767 | net->ipv6.rt6_stats->fib_rt_cache, |
| 2768 | dst_entries_get_slow(&net->ipv6.ip6_dst_ops), |
| 2769 | net->ipv6.rt6_stats->fib_discarded_routes); |
| 2770 | |
| 2771 | return 0; |
| 2772 | } |
| 2773 | |
| 2774 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) |
| 2775 | { |
| 2776 | return single_open_net(inode, file, rt6_stats_seq_show); |
| 2777 | } |
| 2778 | |
| 2779 | static const struct file_operations rt6_stats_seq_fops = { |
| 2780 | .owner = THIS_MODULE, |
| 2781 | .open = rt6_stats_seq_open, |
| 2782 | .read = seq_read, |
| 2783 | .llseek = seq_lseek, |
| 2784 | .release = single_release_net, |
| 2785 | }; |
| 2786 | #endif /* CONFIG_PROC_FS */ |
| 2787 | |
| 2788 | #ifdef CONFIG_SYSCTL |
| 2789 | |
| 2790 | static |
| 2791 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, |
| 2792 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2793 | { |
| 2794 | struct net *net; |
| 2795 | int delay; |
| 2796 | if (!write) |
| 2797 | return -EINVAL; |
| 2798 | |
| 2799 | net = (struct net *)ctl->extra1; |
| 2800 | delay = net->ipv6.sysctl.flush_delay; |
| 2801 | proc_dointvec(ctl, write, buffer, lenp, ppos); |
| 2802 | fib6_run_gc(delay <= 0 ? ~0UL : (unsigned long)delay, net); |
| 2803 | return 0; |
| 2804 | } |
| 2805 | |
| 2806 | ctl_table ipv6_route_table_template[] = { |
| 2807 | { |
| 2808 | .procname = "flush", |
| 2809 | .data = &init_net.ipv6.sysctl.flush_delay, |
| 2810 | .maxlen = sizeof(int), |
| 2811 | .mode = 0200, |
| 2812 | .proc_handler = ipv6_sysctl_rtcache_flush |
| 2813 | }, |
| 2814 | { |
| 2815 | .procname = "gc_thresh", |
| 2816 | .data = &ip6_dst_ops_template.gc_thresh, |
| 2817 | .maxlen = sizeof(int), |
| 2818 | .mode = 0644, |
| 2819 | .proc_handler = proc_dointvec, |
| 2820 | }, |
| 2821 | { |
| 2822 | .procname = "max_size", |
| 2823 | .data = &init_net.ipv6.sysctl.ip6_rt_max_size, |
| 2824 | .maxlen = sizeof(int), |
| 2825 | .mode = 0644, |
| 2826 | .proc_handler = proc_dointvec, |
| 2827 | }, |
| 2828 | { |
| 2829 | .procname = "gc_min_interval", |
| 2830 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
| 2831 | .maxlen = sizeof(int), |
| 2832 | .mode = 0644, |
| 2833 | .proc_handler = proc_dointvec_jiffies, |
| 2834 | }, |
| 2835 | { |
| 2836 | .procname = "gc_timeout", |
| 2837 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout, |
| 2838 | .maxlen = sizeof(int), |
| 2839 | .mode = 0644, |
| 2840 | .proc_handler = proc_dointvec_jiffies, |
| 2841 | }, |
| 2842 | { |
| 2843 | .procname = "gc_interval", |
| 2844 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_interval, |
| 2845 | .maxlen = sizeof(int), |
| 2846 | .mode = 0644, |
| 2847 | .proc_handler = proc_dointvec_jiffies, |
| 2848 | }, |
| 2849 | { |
| 2850 | .procname = "gc_elasticity", |
| 2851 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity, |
| 2852 | .maxlen = sizeof(int), |
| 2853 | .mode = 0644, |
| 2854 | .proc_handler = proc_dointvec, |
| 2855 | }, |
| 2856 | { |
| 2857 | .procname = "mtu_expires", |
| 2858 | .data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires, |
| 2859 | .maxlen = sizeof(int), |
| 2860 | .mode = 0644, |
| 2861 | .proc_handler = proc_dointvec_jiffies, |
| 2862 | }, |
| 2863 | { |
| 2864 | .procname = "min_adv_mss", |
| 2865 | .data = &init_net.ipv6.sysctl.ip6_rt_min_advmss, |
| 2866 | .maxlen = sizeof(int), |
| 2867 | .mode = 0644, |
| 2868 | .proc_handler = proc_dointvec, |
| 2869 | }, |
| 2870 | { |
| 2871 | .procname = "gc_min_interval_ms", |
| 2872 | .data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval, |
| 2873 | .maxlen = sizeof(int), |
| 2874 | .mode = 0644, |
| 2875 | .proc_handler = proc_dointvec_ms_jiffies, |
| 2876 | }, |
| 2877 | { } |
| 2878 | }; |
| 2879 | |
| 2880 | struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net) |
| 2881 | { |
| 2882 | struct ctl_table *table; |
| 2883 | |
| 2884 | table = kmemdup(ipv6_route_table_template, |
| 2885 | sizeof(ipv6_route_table_template), |
| 2886 | GFP_KERNEL); |
| 2887 | |
| 2888 | if (table) { |
| 2889 | table[0].data = &net->ipv6.sysctl.flush_delay; |
| 2890 | table[0].extra1 = net; |
| 2891 | table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh; |
| 2892 | table[2].data = &net->ipv6.sysctl.ip6_rt_max_size; |
| 2893 | table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
| 2894 | table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout; |
| 2895 | table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval; |
| 2896 | table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity; |
| 2897 | table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires; |
| 2898 | table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss; |
| 2899 | table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval; |
| 2900 | } |
| 2901 | |
| 2902 | return table; |
| 2903 | } |
| 2904 | #endif |
| 2905 | |
| 2906 | static int __net_init ip6_route_net_init(struct net *net) |
| 2907 | { |
| 2908 | int ret = -ENOMEM; |
| 2909 | |
| 2910 | memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template, |
| 2911 | sizeof(net->ipv6.ip6_dst_ops)); |
| 2912 | |
| 2913 | if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0) |
| 2914 | goto out_ip6_dst_ops; |
| 2915 | |
| 2916 | net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template, |
| 2917 | sizeof(*net->ipv6.ip6_null_entry), |
| 2918 | GFP_KERNEL); |
| 2919 | if (!net->ipv6.ip6_null_entry) |
| 2920 | goto out_ip6_dst_entries; |
| 2921 | net->ipv6.ip6_null_entry->dst.path = |
| 2922 | (struct dst_entry *)net->ipv6.ip6_null_entry; |
| 2923 | net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
| 2924 | dst_init_metrics(&net->ipv6.ip6_null_entry->dst, |
| 2925 | ip6_template_metrics, true); |
| 2926 | |
| 2927 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2928 | net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template, |
| 2929 | sizeof(*net->ipv6.ip6_prohibit_entry), |
| 2930 | GFP_KERNEL); |
| 2931 | if (!net->ipv6.ip6_prohibit_entry) |
| 2932 | goto out_ip6_null_entry; |
| 2933 | net->ipv6.ip6_prohibit_entry->dst.path = |
| 2934 | (struct dst_entry *)net->ipv6.ip6_prohibit_entry; |
| 2935 | net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
| 2936 | dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst, |
| 2937 | ip6_template_metrics, true); |
| 2938 | |
| 2939 | net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template, |
| 2940 | sizeof(*net->ipv6.ip6_blk_hole_entry), |
| 2941 | GFP_KERNEL); |
| 2942 | if (!net->ipv6.ip6_blk_hole_entry) |
| 2943 | goto out_ip6_prohibit_entry; |
| 2944 | net->ipv6.ip6_blk_hole_entry->dst.path = |
| 2945 | (struct dst_entry *)net->ipv6.ip6_blk_hole_entry; |
| 2946 | net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops; |
| 2947 | dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst, |
| 2948 | ip6_template_metrics, true); |
| 2949 | #endif |
| 2950 | |
| 2951 | net->ipv6.sysctl.flush_delay = 0; |
| 2952 | net->ipv6.sysctl.ip6_rt_max_size = 4096; |
| 2953 | net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2; |
| 2954 | net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ; |
| 2955 | net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ; |
| 2956 | net->ipv6.sysctl.ip6_rt_gc_elasticity = 9; |
| 2957 | net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ; |
| 2958 | net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; |
| 2959 | |
| 2960 | #ifdef CONFIG_PROC_FS |
| 2961 | proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops); |
| 2962 | proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
| 2963 | #endif |
| 2964 | net->ipv6.ip6_rt_gc_expire = 30*HZ; |
| 2965 | |
| 2966 | ret = 0; |
| 2967 | out: |
| 2968 | return ret; |
| 2969 | |
| 2970 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2971 | out_ip6_prohibit_entry: |
| 2972 | kfree(net->ipv6.ip6_prohibit_entry); |
| 2973 | out_ip6_null_entry: |
| 2974 | kfree(net->ipv6.ip6_null_entry); |
| 2975 | #endif |
| 2976 | out_ip6_dst_entries: |
| 2977 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
| 2978 | out_ip6_dst_ops: |
| 2979 | goto out; |
| 2980 | } |
| 2981 | |
| 2982 | static void __net_exit ip6_route_net_exit(struct net *net) |
| 2983 | { |
| 2984 | #ifdef CONFIG_PROC_FS |
| 2985 | proc_net_remove(net, "ipv6_route"); |
| 2986 | proc_net_remove(net, "rt6_stats"); |
| 2987 | #endif |
| 2988 | kfree(net->ipv6.ip6_null_entry); |
| 2989 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 2990 | kfree(net->ipv6.ip6_prohibit_entry); |
| 2991 | kfree(net->ipv6.ip6_blk_hole_entry); |
| 2992 | #endif |
| 2993 | dst_entries_destroy(&net->ipv6.ip6_dst_ops); |
| 2994 | } |
| 2995 | |
| 2996 | static struct pernet_operations ip6_route_net_ops = { |
| 2997 | .init = ip6_route_net_init, |
| 2998 | .exit = ip6_route_net_exit, |
| 2999 | }; |
| 3000 | |
| 3001 | static struct notifier_block ip6_route_dev_notifier = { |
| 3002 | .notifier_call = ip6_route_dev_notify, |
| 3003 | .priority = 0, |
| 3004 | }; |
| 3005 | |
| 3006 | int __init ip6_route_init(void) |
| 3007 | { |
| 3008 | int ret; |
| 3009 | |
| 3010 | ret = -ENOMEM; |
| 3011 | ip6_dst_ops_template.kmem_cachep = |
| 3012 | kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0, |
| 3013 | SLAB_HWCACHE_ALIGN, NULL); |
| 3014 | if (!ip6_dst_ops_template.kmem_cachep) |
| 3015 | goto out; |
| 3016 | |
| 3017 | ret = dst_entries_init(&ip6_dst_blackhole_ops); |
| 3018 | if (ret) |
| 3019 | goto out_kmem_cache; |
| 3020 | |
| 3021 | ret = register_pernet_subsys(&ip6_route_net_ops); |
| 3022 | if (ret) |
| 3023 | goto out_dst_entries; |
| 3024 | |
| 3025 | ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep; |
| 3026 | |
| 3027 | /* Registering of the loopback is done before this portion of code, |
| 3028 | * the loopback reference in rt6_info will not be taken, do it |
| 3029 | * manually for init_net */ |
| 3030 | init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev; |
| 3031 | init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
| 3032 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
| 3033 | init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev; |
| 3034 | init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
| 3035 | init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev; |
| 3036 | init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev); |
| 3037 | #endif |
| 3038 | ret = fib6_init(); |
| 3039 | if (ret) |
| 3040 | goto out_register_subsys; |
| 3041 | |
| 3042 | ret = xfrm6_init(); |
| 3043 | if (ret) |
| 3044 | goto out_fib6_init; |
| 3045 | |
| 3046 | ret = fib6_rules_init(); |
| 3047 | if (ret) |
| 3048 | goto xfrm6_init; |
| 3049 | |
| 3050 | ret = -ENOBUFS; |
| 3051 | if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) || |
| 3052 | __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) || |
| 3053 | __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL)) |
| 3054 | goto fib6_rules_init; |
| 3055 | |
| 3056 | ret = register_netdevice_notifier(&ip6_route_dev_notifier); |
| 3057 | if (ret) |
| 3058 | goto fib6_rules_init; |
| 3059 | |
| 3060 | out: |
| 3061 | return ret; |
| 3062 | |
| 3063 | fib6_rules_init: |
| 3064 | fib6_rules_cleanup(); |
| 3065 | xfrm6_init: |
| 3066 | xfrm6_fini(); |
| 3067 | out_fib6_init: |
| 3068 | fib6_gc_cleanup(); |
| 3069 | out_register_subsys: |
| 3070 | unregister_pernet_subsys(&ip6_route_net_ops); |
| 3071 | out_dst_entries: |
| 3072 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
| 3073 | out_kmem_cache: |
| 3074 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
| 3075 | goto out; |
| 3076 | } |
| 3077 | |
| 3078 | void ip6_route_cleanup(void) |
| 3079 | { |
| 3080 | unregister_netdevice_notifier(&ip6_route_dev_notifier); |
| 3081 | fib6_rules_cleanup(); |
| 3082 | xfrm6_fini(); |
| 3083 | fib6_gc_cleanup(); |
| 3084 | unregister_pernet_subsys(&ip6_route_net_ops); |
| 3085 | dst_entries_destroy(&ip6_dst_blackhole_ops); |
| 3086 | kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep); |
| 3087 | } |