Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Linux INET6 implementation |
| 3 | * FIB front-end. |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
| 8 | * $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | /* Changes: |
| 17 | * |
| 18 | * YOSHIFUJI Hideaki @USAGI |
| 19 | * reworked default router selection. |
| 20 | * - respect outgoing interface |
| 21 | * - select from (probably) reachable routers (i.e. |
| 22 | * routers in REACHABLE, STALE, DELAY or PROBE states). |
| 23 | * - always select the same router if it is (probably) |
| 24 | * reachable. otherwise, round-robin the list. |
| 25 | */ |
| 26 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 27 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/config.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/types.h> |
| 31 | #include <linux/times.h> |
| 32 | #include <linux/socket.h> |
| 33 | #include <linux/sockios.h> |
| 34 | #include <linux/net.h> |
| 35 | #include <linux/route.h> |
| 36 | #include <linux/netdevice.h> |
| 37 | #include <linux/in6.h> |
| 38 | #include <linux/init.h> |
| 39 | #include <linux/netlink.h> |
| 40 | #include <linux/if_arp.h> |
| 41 | |
| 42 | #ifdef CONFIG_PROC_FS |
| 43 | #include <linux/proc_fs.h> |
| 44 | #include <linux/seq_file.h> |
| 45 | #endif |
| 46 | |
| 47 | #include <net/snmp.h> |
| 48 | #include <net/ipv6.h> |
| 49 | #include <net/ip6_fib.h> |
| 50 | #include <net/ip6_route.h> |
| 51 | #include <net/ndisc.h> |
| 52 | #include <net/addrconf.h> |
| 53 | #include <net/tcp.h> |
| 54 | #include <linux/rtnetlink.h> |
| 55 | #include <net/dst.h> |
| 56 | #include <net/xfrm.h> |
| 57 | |
| 58 | #include <asm/uaccess.h> |
| 59 | |
| 60 | #ifdef CONFIG_SYSCTL |
| 61 | #include <linux/sysctl.h> |
| 62 | #endif |
| 63 | |
| 64 | /* Set to 3 to get tracing. */ |
| 65 | #define RT6_DEBUG 2 |
| 66 | |
| 67 | #if RT6_DEBUG >= 3 |
| 68 | #define RDBG(x) printk x |
| 69 | #define RT6_TRACE(x...) printk(KERN_DEBUG x) |
| 70 | #else |
| 71 | #define RDBG(x) |
| 72 | #define RT6_TRACE(x...) do { ; } while (0) |
| 73 | #endif |
| 74 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 75 | #define CLONE_OFFLINK_ROUTE 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | static int ip6_rt_max_size = 4096; |
| 78 | static int ip6_rt_gc_min_interval = HZ / 2; |
| 79 | static int ip6_rt_gc_timeout = 60*HZ; |
| 80 | int ip6_rt_gc_interval = 30*HZ; |
| 81 | static int ip6_rt_gc_elasticity = 9; |
| 82 | static int ip6_rt_mtu_expires = 10*60*HZ; |
| 83 | static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40; |
| 84 | |
| 85 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort); |
| 86 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie); |
| 87 | static struct dst_entry *ip6_negative_advice(struct dst_entry *); |
| 88 | static void ip6_dst_destroy(struct dst_entry *); |
| 89 | static void ip6_dst_ifdown(struct dst_entry *, |
| 90 | struct net_device *dev, int how); |
| 91 | static int ip6_dst_gc(void); |
| 92 | |
| 93 | static int ip6_pkt_discard(struct sk_buff *skb); |
| 94 | static int ip6_pkt_discard_out(struct sk_buff *skb); |
| 95 | static void ip6_link_failure(struct sk_buff *skb); |
| 96 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu); |
| 97 | |
| 98 | static struct dst_ops ip6_dst_ops = { |
| 99 | .family = AF_INET6, |
| 100 | .protocol = __constant_htons(ETH_P_IPV6), |
| 101 | .gc = ip6_dst_gc, |
| 102 | .gc_thresh = 1024, |
| 103 | .check = ip6_dst_check, |
| 104 | .destroy = ip6_dst_destroy, |
| 105 | .ifdown = ip6_dst_ifdown, |
| 106 | .negative_advice = ip6_negative_advice, |
| 107 | .link_failure = ip6_link_failure, |
| 108 | .update_pmtu = ip6_rt_update_pmtu, |
| 109 | .entry_size = sizeof(struct rt6_info), |
| 110 | }; |
| 111 | |
| 112 | struct rt6_info ip6_null_entry = { |
| 113 | .u = { |
| 114 | .dst = { |
| 115 | .__refcnt = ATOMIC_INIT(1), |
| 116 | .__use = 1, |
| 117 | .dev = &loopback_dev, |
| 118 | .obsolete = -1, |
| 119 | .error = -ENETUNREACH, |
| 120 | .metrics = { [RTAX_HOPLIMIT - 1] = 255, }, |
| 121 | .input = ip6_pkt_discard, |
| 122 | .output = ip6_pkt_discard_out, |
| 123 | .ops = &ip6_dst_ops, |
| 124 | .path = (struct dst_entry*)&ip6_null_entry, |
| 125 | } |
| 126 | }, |
| 127 | .rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP), |
| 128 | .rt6i_metric = ~(u32) 0, |
| 129 | .rt6i_ref = ATOMIC_INIT(1), |
| 130 | }; |
| 131 | |
| 132 | struct fib6_node ip6_routing_table = { |
| 133 | .leaf = &ip6_null_entry, |
| 134 | .fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO, |
| 135 | }; |
| 136 | |
| 137 | /* Protects all the ip6 fib */ |
| 138 | |
| 139 | DEFINE_RWLOCK(rt6_lock); |
| 140 | |
| 141 | |
| 142 | /* allocate dst with ip6_dst_ops */ |
| 143 | static __inline__ struct rt6_info *ip6_dst_alloc(void) |
| 144 | { |
| 145 | return (struct rt6_info *)dst_alloc(&ip6_dst_ops); |
| 146 | } |
| 147 | |
| 148 | static void ip6_dst_destroy(struct dst_entry *dst) |
| 149 | { |
| 150 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 151 | struct inet6_dev *idev = rt->rt6i_idev; |
| 152 | |
| 153 | if (idev != NULL) { |
| 154 | rt->rt6i_idev = NULL; |
| 155 | in6_dev_put(idev); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev, |
| 160 | int how) |
| 161 | { |
| 162 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 163 | struct inet6_dev *idev = rt->rt6i_idev; |
| 164 | |
| 165 | if (dev != &loopback_dev && idev != NULL && idev->dev == dev) { |
| 166 | struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev); |
| 167 | if (loopback_idev != NULL) { |
| 168 | rt->rt6i_idev = loopback_idev; |
| 169 | in6_dev_put(idev); |
| 170 | } |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | static __inline__ int rt6_check_expired(const struct rt6_info *rt) |
| 175 | { |
| 176 | return (rt->rt6i_flags & RTF_EXPIRES && |
| 177 | time_after(jiffies, rt->rt6i_expires)); |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Route lookup. Any rt6_lock is implied. |
| 182 | */ |
| 183 | |
| 184 | static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt, |
| 185 | int oif, |
| 186 | int strict) |
| 187 | { |
| 188 | struct rt6_info *local = NULL; |
| 189 | struct rt6_info *sprt; |
| 190 | |
| 191 | if (oif) { |
| 192 | for (sprt = rt; sprt; sprt = sprt->u.next) { |
| 193 | struct net_device *dev = sprt->rt6i_dev; |
| 194 | if (dev->ifindex == oif) |
| 195 | return sprt; |
| 196 | if (dev->flags & IFF_LOOPBACK) { |
| 197 | if (sprt->rt6i_idev == NULL || |
| 198 | sprt->rt6i_idev->dev->ifindex != oif) { |
| 199 | if (strict && oif) |
| 200 | continue; |
| 201 | if (local && (!oif || |
| 202 | local->rt6i_idev->dev->ifindex == oif)) |
| 203 | continue; |
| 204 | } |
| 205 | local = sprt; |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | if (local) |
| 210 | return local; |
| 211 | |
| 212 | if (strict) |
| 213 | return &ip6_null_entry; |
| 214 | } |
| 215 | return rt; |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * pointer to the last default router chosen. BH is disabled locally. |
| 220 | */ |
| 221 | static struct rt6_info *rt6_dflt_pointer; |
| 222 | static DEFINE_SPINLOCK(rt6_dflt_lock); |
| 223 | |
| 224 | void rt6_reset_dflt_pointer(struct rt6_info *rt) |
| 225 | { |
| 226 | spin_lock_bh(&rt6_dflt_lock); |
| 227 | if (rt == NULL || rt == rt6_dflt_pointer) { |
| 228 | RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer); |
| 229 | rt6_dflt_pointer = NULL; |
| 230 | } |
| 231 | spin_unlock_bh(&rt6_dflt_lock); |
| 232 | } |
| 233 | |
| 234 | /* Default Router Selection (RFC 2461 6.3.6) */ |
| 235 | static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif) |
| 236 | { |
| 237 | struct rt6_info *match = NULL; |
| 238 | struct rt6_info *sprt; |
| 239 | int mpri = 0; |
| 240 | |
| 241 | for (sprt = rt; sprt; sprt = sprt->u.next) { |
| 242 | struct neighbour *neigh; |
| 243 | int m = 0; |
| 244 | |
| 245 | if (!oif || |
| 246 | (sprt->rt6i_dev && |
| 247 | sprt->rt6i_dev->ifindex == oif)) |
| 248 | m += 8; |
| 249 | |
| 250 | if (rt6_check_expired(sprt)) |
| 251 | continue; |
| 252 | |
| 253 | if (sprt == rt6_dflt_pointer) |
| 254 | m += 4; |
| 255 | |
| 256 | if ((neigh = sprt->rt6i_nexthop) != NULL) { |
| 257 | read_lock_bh(&neigh->lock); |
| 258 | switch (neigh->nud_state) { |
| 259 | case NUD_REACHABLE: |
| 260 | m += 3; |
| 261 | break; |
| 262 | |
| 263 | case NUD_STALE: |
| 264 | case NUD_DELAY: |
| 265 | case NUD_PROBE: |
| 266 | m += 2; |
| 267 | break; |
| 268 | |
| 269 | case NUD_NOARP: |
| 270 | case NUD_PERMANENT: |
| 271 | m += 1; |
| 272 | break; |
| 273 | |
| 274 | case NUD_INCOMPLETE: |
| 275 | default: |
| 276 | read_unlock_bh(&neigh->lock); |
| 277 | continue; |
| 278 | } |
| 279 | read_unlock_bh(&neigh->lock); |
| 280 | } else { |
| 281 | continue; |
| 282 | } |
| 283 | |
| 284 | if (m > mpri || m >= 12) { |
| 285 | match = sprt; |
| 286 | mpri = m; |
| 287 | if (m >= 12) { |
| 288 | /* we choose the last default router if it |
| 289 | * is in (probably) reachable state. |
| 290 | * If route changed, we should do pmtu |
| 291 | * discovery. --yoshfuji |
| 292 | */ |
| 293 | break; |
| 294 | } |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | spin_lock(&rt6_dflt_lock); |
| 299 | if (!match) { |
| 300 | /* |
| 301 | * No default routers are known to be reachable. |
| 302 | * SHOULD round robin |
| 303 | */ |
| 304 | if (rt6_dflt_pointer) { |
| 305 | for (sprt = rt6_dflt_pointer->u.next; |
| 306 | sprt; sprt = sprt->u.next) { |
| 307 | if (sprt->u.dst.obsolete <= 0 && |
| 308 | sprt->u.dst.error == 0 && |
| 309 | !rt6_check_expired(sprt)) { |
| 310 | match = sprt; |
| 311 | break; |
| 312 | } |
| 313 | } |
| 314 | for (sprt = rt; |
| 315 | !match && sprt; |
| 316 | sprt = sprt->u.next) { |
| 317 | if (sprt->u.dst.obsolete <= 0 && |
| 318 | sprt->u.dst.error == 0 && |
| 319 | !rt6_check_expired(sprt)) { |
| 320 | match = sprt; |
| 321 | break; |
| 322 | } |
| 323 | if (sprt == rt6_dflt_pointer) |
| 324 | break; |
| 325 | } |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | if (match) { |
| 330 | if (rt6_dflt_pointer != match) |
| 331 | RT6_TRACE("changed default router: %p->%p\n", |
| 332 | rt6_dflt_pointer, match); |
| 333 | rt6_dflt_pointer = match; |
| 334 | } |
| 335 | spin_unlock(&rt6_dflt_lock); |
| 336 | |
| 337 | if (!match) { |
| 338 | /* |
| 339 | * Last Resort: if no default routers found, |
| 340 | * use addrconf default route. |
| 341 | * We don't record this route. |
| 342 | */ |
| 343 | for (sprt = ip6_routing_table.leaf; |
| 344 | sprt; sprt = sprt->u.next) { |
| 345 | if (!rt6_check_expired(sprt) && |
| 346 | (sprt->rt6i_flags & RTF_DEFAULT) && |
| 347 | (!oif || |
| 348 | (sprt->rt6i_dev && |
| 349 | sprt->rt6i_dev->ifindex == oif))) { |
| 350 | match = sprt; |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | if (!match) { |
| 355 | /* no default route. give up. */ |
| 356 | match = &ip6_null_entry; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | return match; |
| 361 | } |
| 362 | |
| 363 | struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr, |
| 364 | int oif, int strict) |
| 365 | { |
| 366 | struct fib6_node *fn; |
| 367 | struct rt6_info *rt; |
| 368 | |
| 369 | read_lock_bh(&rt6_lock); |
| 370 | fn = fib6_lookup(&ip6_routing_table, daddr, saddr); |
| 371 | rt = rt6_device_match(fn->leaf, oif, strict); |
| 372 | dst_hold(&rt->u.dst); |
| 373 | rt->u.dst.__use++; |
| 374 | read_unlock_bh(&rt6_lock); |
| 375 | |
| 376 | rt->u.dst.lastuse = jiffies; |
| 377 | if (rt->u.dst.error == 0) |
| 378 | return rt; |
| 379 | dst_release(&rt->u.dst); |
| 380 | return NULL; |
| 381 | } |
| 382 | |
| 383 | /* ip6_ins_rt is called with FREE rt6_lock. |
| 384 | It takes new route entry, the addition fails by any reason the |
| 385 | route is freed. In any case, if caller does not hold it, it may |
| 386 | be destroyed. |
| 387 | */ |
| 388 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 389 | int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh, |
| 390 | void *_rtattr, struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | { |
| 392 | int err; |
| 393 | |
| 394 | write_lock_bh(&rt6_lock); |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 395 | err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | write_unlock_bh(&rt6_lock); |
| 397 | |
| 398 | return err; |
| 399 | } |
| 400 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 401 | static struct rt6_info *rt6_alloc_cow(struct rt6_info *ort, struct in6_addr *daddr, |
| 402 | struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | struct rt6_info *rt; |
| 405 | |
| 406 | /* |
| 407 | * Clone the route. |
| 408 | */ |
| 409 | |
| 410 | rt = ip6_rt_copy(ort); |
| 411 | |
| 412 | if (rt) { |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 413 | if (!(rt->rt6i_flags&RTF_GATEWAY)) { |
| 414 | if (rt->rt6i_dst.plen != 128 && |
| 415 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) |
| 416 | rt->rt6i_flags |= RTF_ANYCAST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | ipv6_addr_copy(&rt->rt6i_gateway, daddr); |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 418 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 420 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | rt->rt6i_dst.plen = 128; |
| 422 | rt->rt6i_flags |= RTF_CACHE; |
| 423 | rt->u.dst.flags |= DST_HOST; |
| 424 | |
| 425 | #ifdef CONFIG_IPV6_SUBTREES |
| 426 | if (rt->rt6i_src.plen && saddr) { |
| 427 | ipv6_addr_copy(&rt->rt6i_src.addr, saddr); |
| 428 | rt->rt6i_src.plen = 128; |
| 429 | } |
| 430 | #endif |
| 431 | |
| 432 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
| 433 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 434 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
YOSHIFUJI Hideaki | 95a9a5b | 2006-03-20 16:55:51 -0800 | [diff] [blame] | 436 | return rt; |
| 437 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | |
YOSHIFUJI Hideaki | 299d993 | 2006-03-20 16:58:32 -0800 | [diff] [blame] | 439 | static struct rt6_info *rt6_alloc_clone(struct rt6_info *ort, struct in6_addr *daddr) |
| 440 | { |
| 441 | struct rt6_info *rt = ip6_rt_copy(ort); |
| 442 | if (rt) { |
| 443 | ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); |
| 444 | rt->rt6i_dst.plen = 128; |
| 445 | rt->rt6i_flags |= RTF_CACHE; |
| 446 | if (rt->rt6i_flags & RTF_REJECT) |
| 447 | rt->u.dst.error = ort->u.dst.error; |
| 448 | rt->u.dst.flags |= DST_HOST; |
| 449 | rt->rt6i_nexthop = neigh_clone(ort->rt6i_nexthop); |
| 450 | } |
| 451 | return rt; |
| 452 | } |
| 453 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | #define BACKTRACK() \ |
| 455 | if (rt == &ip6_null_entry && strict) { \ |
| 456 | while ((fn = fn->parent) != NULL) { \ |
| 457 | if (fn->fn_flags & RTN_ROOT) { \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | goto out; \ |
| 459 | } \ |
| 460 | if (fn->fn_flags & RTN_RTINFO) \ |
| 461 | goto restart; \ |
| 462 | } \ |
| 463 | } |
| 464 | |
| 465 | |
| 466 | void ip6_route_input(struct sk_buff *skb) |
| 467 | { |
| 468 | struct fib6_node *fn; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 469 | struct rt6_info *rt, *nrt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | int strict; |
| 471 | int attempts = 3; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 472 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL); |
| 475 | |
| 476 | relookup: |
| 477 | read_lock_bh(&rt6_lock); |
| 478 | |
| 479 | fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr, |
| 480 | &skb->nh.ipv6h->saddr); |
| 481 | |
| 482 | restart: |
| 483 | rt = fn->leaf; |
| 484 | |
| 485 | if ((rt->rt6i_flags & RTF_CACHE)) { |
| 486 | rt = rt6_device_match(rt, skb->dev->ifindex, strict); |
| 487 | BACKTRACK(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | goto out; |
| 489 | } |
| 490 | |
Yan Zheng | 9d17f21 | 2005-10-28 15:12:00 -0700 | [diff] [blame] | 491 | rt = rt6_device_match(rt, skb->dev->ifindex, strict); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | BACKTRACK(); |
| 493 | |
YOSHIFUJI Hideaki | fb9de91 | 2006-03-20 16:59:08 -0800 | [diff] [blame] | 494 | dst_hold(&rt->u.dst); |
| 495 | read_unlock_bh(&rt6_lock); |
| 496 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 497 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
| 498 | nrt = rt6_alloc_cow(rt, &skb->nh.ipv6h->daddr, &skb->nh.ipv6h->saddr); |
| 499 | else { |
| 500 | #if CLONE_OFFLINK_ROUTE |
| 501 | nrt = rt6_alloc_clone(rt, &skb->nh.ipv6h->daddr); |
| 502 | #else |
| 503 | goto out2; |
| 504 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 507 | dst_release(&rt->u.dst); |
| 508 | rt = nrt ? : &ip6_null_entry; |
| 509 | |
| 510 | dst_hold(&rt->u.dst); |
| 511 | if (nrt) { |
| 512 | err = ip6_ins_rt(nrt, NULL, NULL, &NETLINK_CB(skb)); |
| 513 | if (!err) |
| 514 | goto out2; |
| 515 | } |
| 516 | |
| 517 | if (--attempts <= 0) |
| 518 | goto out2; |
| 519 | |
| 520 | /* |
| 521 | * Race condition! In the gap, when rt6_lock was |
| 522 | * released someone could insert this route. Relookup. |
| 523 | */ |
| 524 | dst_release(&rt->u.dst); |
| 525 | goto relookup; |
| 526 | |
| 527 | out: |
| 528 | dst_hold(&rt->u.dst); |
| 529 | read_unlock_bh(&rt6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | out2: |
| 531 | rt->u.dst.lastuse = jiffies; |
| 532 | rt->u.dst.__use++; |
| 533 | skb->dst = (struct dst_entry *) rt; |
YOSHIFUJI Hideaki | fb9de91 | 2006-03-20 16:59:08 -0800 | [diff] [blame] | 534 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl) |
| 538 | { |
| 539 | struct fib6_node *fn; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 540 | struct rt6_info *rt, *nrt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | int strict; |
| 542 | int attempts = 3; |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 543 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL); |
| 546 | |
| 547 | relookup: |
| 548 | read_lock_bh(&rt6_lock); |
| 549 | |
| 550 | fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src); |
| 551 | |
| 552 | restart: |
| 553 | rt = fn->leaf; |
| 554 | |
| 555 | if ((rt->rt6i_flags & RTF_CACHE)) { |
| 556 | rt = rt6_device_match(rt, fl->oif, strict); |
| 557 | BACKTRACK(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | goto out; |
| 559 | } |
| 560 | if (rt->rt6i_flags & RTF_DEFAULT) { |
| 561 | if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF) |
| 562 | rt = rt6_best_dflt(rt, fl->oif); |
| 563 | } else { |
| 564 | rt = rt6_device_match(rt, fl->oif, strict); |
| 565 | BACKTRACK(); |
| 566 | } |
| 567 | |
YOSHIFUJI Hideaki | fb9de91 | 2006-03-20 16:59:08 -0800 | [diff] [blame] | 568 | dst_hold(&rt->u.dst); |
| 569 | read_unlock_bh(&rt6_lock); |
| 570 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 571 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
YOSHIFUJI Hideaki | e40cf35 | 2006-03-20 16:59:27 -0800 | [diff] [blame] | 572 | nrt = rt6_alloc_cow(rt, &fl->fl6_dst, &fl->fl6_src); |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 573 | else { |
| 574 | #if CLONE_OFFLINK_ROUTE |
| 575 | nrt = rt6_alloc_clone(rt, &fl->fl6_dst); |
| 576 | #else |
| 577 | goto out2; |
| 578 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | } |
YOSHIFUJI Hideaki | e40cf35 | 2006-03-20 16:59:27 -0800 | [diff] [blame] | 580 | |
YOSHIFUJI Hideaki | 519fbd8 | 2006-03-20 17:00:05 -0800 | [diff] [blame^] | 581 | dst_release(&rt->u.dst); |
| 582 | rt = nrt ? : &ip6_null_entry; |
| 583 | |
| 584 | dst_hold(&rt->u.dst); |
| 585 | if (nrt) { |
| 586 | err = ip6_ins_rt(nrt, NULL, NULL, NULL); |
| 587 | if (!err) |
| 588 | goto out2; |
| 589 | } |
| 590 | |
| 591 | if (--attempts <= 0) |
| 592 | goto out2; |
| 593 | |
| 594 | /* |
| 595 | * Race condition! In the gap, when rt6_lock was |
| 596 | * released someone could insert this route. Relookup. |
| 597 | */ |
| 598 | dst_release(&rt->u.dst); |
| 599 | goto relookup; |
| 600 | |
| 601 | out: |
| 602 | dst_hold(&rt->u.dst); |
| 603 | read_unlock_bh(&rt6_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | out2: |
| 605 | rt->u.dst.lastuse = jiffies; |
| 606 | rt->u.dst.__use++; |
| 607 | return &rt->u.dst; |
| 608 | } |
| 609 | |
| 610 | |
| 611 | /* |
| 612 | * Destination cache support functions |
| 613 | */ |
| 614 | |
| 615 | static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie) |
| 616 | { |
| 617 | struct rt6_info *rt; |
| 618 | |
| 619 | rt = (struct rt6_info *) dst; |
| 620 | |
| 621 | if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie)) |
| 622 | return dst; |
| 623 | |
| 624 | return NULL; |
| 625 | } |
| 626 | |
| 627 | static struct dst_entry *ip6_negative_advice(struct dst_entry *dst) |
| 628 | { |
| 629 | struct rt6_info *rt = (struct rt6_info *) dst; |
| 630 | |
| 631 | if (rt) { |
| 632 | if (rt->rt6i_flags & RTF_CACHE) |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 633 | ip6_del_rt(rt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | else |
| 635 | dst_release(dst); |
| 636 | } |
| 637 | return NULL; |
| 638 | } |
| 639 | |
| 640 | static void ip6_link_failure(struct sk_buff *skb) |
| 641 | { |
| 642 | struct rt6_info *rt; |
| 643 | |
| 644 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev); |
| 645 | |
| 646 | rt = (struct rt6_info *) skb->dst; |
| 647 | if (rt) { |
| 648 | if (rt->rt6i_flags&RTF_CACHE) { |
| 649 | dst_set_expires(&rt->u.dst, 0); |
| 650 | rt->rt6i_flags |= RTF_EXPIRES; |
| 651 | } else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) |
| 652 | rt->rt6i_node->fn_sernum = -1; |
| 653 | } |
| 654 | } |
| 655 | |
| 656 | static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) |
| 657 | { |
| 658 | struct rt6_info *rt6 = (struct rt6_info*)dst; |
| 659 | |
| 660 | if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { |
| 661 | rt6->rt6i_flags |= RTF_MODIFIED; |
| 662 | if (mtu < IPV6_MIN_MTU) { |
| 663 | mtu = IPV6_MIN_MTU; |
| 664 | dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 665 | } |
| 666 | dst->metrics[RTAX_MTU-1] = mtu; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | /* Protected by rt6_lock. */ |
| 671 | static struct dst_entry *ndisc_dst_gc_list; |
| 672 | static int ipv6_get_mtu(struct net_device *dev); |
| 673 | |
| 674 | static inline unsigned int ipv6_advmss(unsigned int mtu) |
| 675 | { |
| 676 | mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr); |
| 677 | |
| 678 | if (mtu < ip6_rt_min_advmss) |
| 679 | mtu = ip6_rt_min_advmss; |
| 680 | |
| 681 | /* |
| 682 | * Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and |
| 683 | * corresponding MSS is IPV6_MAXPLEN - tcp_header_size. |
| 684 | * IPV6_MAXPLEN is also valid and means: "any MSS, |
| 685 | * rely only on pmtu discovery" |
| 686 | */ |
| 687 | if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr)) |
| 688 | mtu = IPV6_MAXPLEN; |
| 689 | return mtu; |
| 690 | } |
| 691 | |
| 692 | struct dst_entry *ndisc_dst_alloc(struct net_device *dev, |
| 693 | struct neighbour *neigh, |
| 694 | struct in6_addr *addr, |
| 695 | int (*output)(struct sk_buff *)) |
| 696 | { |
| 697 | struct rt6_info *rt; |
| 698 | struct inet6_dev *idev = in6_dev_get(dev); |
| 699 | |
| 700 | if (unlikely(idev == NULL)) |
| 701 | return NULL; |
| 702 | |
| 703 | rt = ip6_dst_alloc(); |
| 704 | if (unlikely(rt == NULL)) { |
| 705 | in6_dev_put(idev); |
| 706 | goto out; |
| 707 | } |
| 708 | |
| 709 | dev_hold(dev); |
| 710 | if (neigh) |
| 711 | neigh_hold(neigh); |
| 712 | else |
| 713 | neigh = ndisc_get_neigh(dev, addr); |
| 714 | |
| 715 | rt->rt6i_dev = dev; |
| 716 | rt->rt6i_idev = idev; |
| 717 | rt->rt6i_nexthop = neigh; |
| 718 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 719 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255; |
| 720 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
| 721 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 722 | rt->u.dst.output = output; |
| 723 | |
| 724 | #if 0 /* there's no chance to use these for ndisc */ |
| 725 | rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST |
| 726 | ? DST_HOST |
| 727 | : 0; |
| 728 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); |
| 729 | rt->rt6i_dst.plen = 128; |
| 730 | #endif |
| 731 | |
| 732 | write_lock_bh(&rt6_lock); |
| 733 | rt->u.dst.next = ndisc_dst_gc_list; |
| 734 | ndisc_dst_gc_list = &rt->u.dst; |
| 735 | write_unlock_bh(&rt6_lock); |
| 736 | |
| 737 | fib6_force_start_gc(); |
| 738 | |
| 739 | out: |
| 740 | return (struct dst_entry *)rt; |
| 741 | } |
| 742 | |
| 743 | int ndisc_dst_gc(int *more) |
| 744 | { |
| 745 | struct dst_entry *dst, *next, **pprev; |
| 746 | int freed; |
| 747 | |
| 748 | next = NULL; |
| 749 | pprev = &ndisc_dst_gc_list; |
| 750 | freed = 0; |
| 751 | while ((dst = *pprev) != NULL) { |
| 752 | if (!atomic_read(&dst->__refcnt)) { |
| 753 | *pprev = dst->next; |
| 754 | dst_free(dst); |
| 755 | freed++; |
| 756 | } else { |
| 757 | pprev = &dst->next; |
| 758 | (*more)++; |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | return freed; |
| 763 | } |
| 764 | |
| 765 | static int ip6_dst_gc(void) |
| 766 | { |
| 767 | static unsigned expire = 30*HZ; |
| 768 | static unsigned long last_gc; |
| 769 | unsigned long now = jiffies; |
| 770 | |
| 771 | if (time_after(last_gc + ip6_rt_gc_min_interval, now) && |
| 772 | atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size) |
| 773 | goto out; |
| 774 | |
| 775 | expire++; |
| 776 | fib6_run_gc(expire); |
| 777 | last_gc = now; |
| 778 | if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh) |
| 779 | expire = ip6_rt_gc_timeout>>1; |
| 780 | |
| 781 | out: |
| 782 | expire -= expire>>ip6_rt_gc_elasticity; |
| 783 | return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size); |
| 784 | } |
| 785 | |
| 786 | /* Clean host part of a prefix. Not necessary in radix tree, |
| 787 | but results in cleaner routing tables. |
| 788 | |
| 789 | Remove it only when all the things will work! |
| 790 | */ |
| 791 | |
| 792 | static int ipv6_get_mtu(struct net_device *dev) |
| 793 | { |
| 794 | int mtu = IPV6_MIN_MTU; |
| 795 | struct inet6_dev *idev; |
| 796 | |
| 797 | idev = in6_dev_get(dev); |
| 798 | if (idev) { |
| 799 | mtu = idev->cnf.mtu6; |
| 800 | in6_dev_put(idev); |
| 801 | } |
| 802 | return mtu; |
| 803 | } |
| 804 | |
| 805 | int ipv6_get_hoplimit(struct net_device *dev) |
| 806 | { |
| 807 | int hoplimit = ipv6_devconf.hop_limit; |
| 808 | struct inet6_dev *idev; |
| 809 | |
| 810 | idev = in6_dev_get(dev); |
| 811 | if (idev) { |
| 812 | hoplimit = idev->cnf.hop_limit; |
| 813 | in6_dev_put(idev); |
| 814 | } |
| 815 | return hoplimit; |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * |
| 820 | */ |
| 821 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 822 | int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, |
| 823 | void *_rtattr, struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | { |
| 825 | int err; |
| 826 | struct rtmsg *r; |
| 827 | struct rtattr **rta; |
| 828 | struct rt6_info *rt = NULL; |
| 829 | struct net_device *dev = NULL; |
| 830 | struct inet6_dev *idev = NULL; |
| 831 | int addr_type; |
| 832 | |
| 833 | rta = (struct rtattr **) _rtattr; |
| 834 | |
| 835 | if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128) |
| 836 | return -EINVAL; |
| 837 | #ifndef CONFIG_IPV6_SUBTREES |
| 838 | if (rtmsg->rtmsg_src_len) |
| 839 | return -EINVAL; |
| 840 | #endif |
| 841 | if (rtmsg->rtmsg_ifindex) { |
| 842 | err = -ENODEV; |
| 843 | dev = dev_get_by_index(rtmsg->rtmsg_ifindex); |
| 844 | if (!dev) |
| 845 | goto out; |
| 846 | idev = in6_dev_get(dev); |
| 847 | if (!idev) |
| 848 | goto out; |
| 849 | } |
| 850 | |
| 851 | if (rtmsg->rtmsg_metric == 0) |
| 852 | rtmsg->rtmsg_metric = IP6_RT_PRIO_USER; |
| 853 | |
| 854 | rt = ip6_dst_alloc(); |
| 855 | |
| 856 | if (rt == NULL) { |
| 857 | err = -ENOMEM; |
| 858 | goto out; |
| 859 | } |
| 860 | |
| 861 | rt->u.dst.obsolete = -1; |
YOSHIFUJI Hideaki | 3dd4bc6 | 2005-12-19 14:02:45 -0800 | [diff] [blame] | 862 | rt->rt6i_expires = jiffies + clock_t_to_jiffies(rtmsg->rtmsg_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | if (nlh && (r = NLMSG_DATA(nlh))) { |
| 864 | rt->rt6i_protocol = r->rtm_protocol; |
| 865 | } else { |
| 866 | rt->rt6i_protocol = RTPROT_BOOT; |
| 867 | } |
| 868 | |
| 869 | addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst); |
| 870 | |
| 871 | if (addr_type & IPV6_ADDR_MULTICAST) |
| 872 | rt->u.dst.input = ip6_mc_input; |
| 873 | else |
| 874 | rt->u.dst.input = ip6_forward; |
| 875 | |
| 876 | rt->u.dst.output = ip6_output; |
| 877 | |
| 878 | ipv6_addr_prefix(&rt->rt6i_dst.addr, |
| 879 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len); |
| 880 | rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len; |
| 881 | if (rt->rt6i_dst.plen == 128) |
| 882 | rt->u.dst.flags = DST_HOST; |
| 883 | |
| 884 | #ifdef CONFIG_IPV6_SUBTREES |
| 885 | ipv6_addr_prefix(&rt->rt6i_src.addr, |
| 886 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); |
| 887 | rt->rt6i_src.plen = rtmsg->rtmsg_src_len; |
| 888 | #endif |
| 889 | |
| 890 | rt->rt6i_metric = rtmsg->rtmsg_metric; |
| 891 | |
| 892 | /* We cannot add true routes via loopback here, |
| 893 | they would result in kernel looping; promote them to reject routes |
| 894 | */ |
| 895 | if ((rtmsg->rtmsg_flags&RTF_REJECT) || |
| 896 | (dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) { |
| 897 | /* hold loopback dev/idev if we haven't done so. */ |
| 898 | if (dev != &loopback_dev) { |
| 899 | if (dev) { |
| 900 | dev_put(dev); |
| 901 | in6_dev_put(idev); |
| 902 | } |
| 903 | dev = &loopback_dev; |
| 904 | dev_hold(dev); |
| 905 | idev = in6_dev_get(dev); |
| 906 | if (!idev) { |
| 907 | err = -ENODEV; |
| 908 | goto out; |
| 909 | } |
| 910 | } |
| 911 | rt->u.dst.output = ip6_pkt_discard_out; |
| 912 | rt->u.dst.input = ip6_pkt_discard; |
| 913 | rt->u.dst.error = -ENETUNREACH; |
| 914 | rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP; |
| 915 | goto install_route; |
| 916 | } |
| 917 | |
| 918 | if (rtmsg->rtmsg_flags & RTF_GATEWAY) { |
| 919 | struct in6_addr *gw_addr; |
| 920 | int gwa_type; |
| 921 | |
| 922 | gw_addr = &rtmsg->rtmsg_gateway; |
| 923 | ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway); |
| 924 | gwa_type = ipv6_addr_type(gw_addr); |
| 925 | |
| 926 | if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) { |
| 927 | struct rt6_info *grt; |
| 928 | |
| 929 | /* IPv6 strictly inhibits using not link-local |
| 930 | addresses as nexthop address. |
| 931 | Otherwise, router will not able to send redirects. |
| 932 | It is very good, but in some (rare!) circumstances |
| 933 | (SIT, PtP, NBMA NOARP links) it is handy to allow |
| 934 | some exceptions. --ANK |
| 935 | */ |
| 936 | err = -EINVAL; |
| 937 | if (!(gwa_type&IPV6_ADDR_UNICAST)) |
| 938 | goto out; |
| 939 | |
| 940 | grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1); |
| 941 | |
| 942 | err = -EHOSTUNREACH; |
| 943 | if (grt == NULL) |
| 944 | goto out; |
| 945 | if (dev) { |
| 946 | if (dev != grt->rt6i_dev) { |
| 947 | dst_release(&grt->u.dst); |
| 948 | goto out; |
| 949 | } |
| 950 | } else { |
| 951 | dev = grt->rt6i_dev; |
| 952 | idev = grt->rt6i_idev; |
| 953 | dev_hold(dev); |
| 954 | in6_dev_hold(grt->rt6i_idev); |
| 955 | } |
| 956 | if (!(grt->rt6i_flags&RTF_GATEWAY)) |
| 957 | err = 0; |
| 958 | dst_release(&grt->u.dst); |
| 959 | |
| 960 | if (err) |
| 961 | goto out; |
| 962 | } |
| 963 | err = -EINVAL; |
| 964 | if (dev == NULL || (dev->flags&IFF_LOOPBACK)) |
| 965 | goto out; |
| 966 | } |
| 967 | |
| 968 | err = -ENODEV; |
| 969 | if (dev == NULL) |
| 970 | goto out; |
| 971 | |
| 972 | if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) { |
| 973 | rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev); |
| 974 | if (IS_ERR(rt->rt6i_nexthop)) { |
| 975 | err = PTR_ERR(rt->rt6i_nexthop); |
| 976 | rt->rt6i_nexthop = NULL; |
| 977 | goto out; |
| 978 | } |
| 979 | } |
| 980 | |
| 981 | rt->rt6i_flags = rtmsg->rtmsg_flags; |
| 982 | |
| 983 | install_route: |
| 984 | if (rta && rta[RTA_METRICS-1]) { |
| 985 | int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]); |
| 986 | struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]); |
| 987 | |
| 988 | while (RTA_OK(attr, attrlen)) { |
| 989 | unsigned flavor = attr->rta_type; |
| 990 | if (flavor) { |
| 991 | if (flavor > RTAX_MAX) { |
| 992 | err = -EINVAL; |
| 993 | goto out; |
| 994 | } |
| 995 | rt->u.dst.metrics[flavor-1] = |
| 996 | *(u32 *)RTA_DATA(attr); |
| 997 | } |
| 998 | attr = RTA_NEXT(attr, attrlen); |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0) |
| 1003 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
| 1004 | if (!rt->u.dst.metrics[RTAX_MTU-1]) |
| 1005 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev); |
| 1006 | if (!rt->u.dst.metrics[RTAX_ADVMSS-1]) |
| 1007 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 1008 | rt->u.dst.dev = dev; |
| 1009 | rt->rt6i_idev = idev; |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1010 | return ip6_ins_rt(rt, nlh, _rtattr, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | |
| 1012 | out: |
| 1013 | if (dev) |
| 1014 | dev_put(dev); |
| 1015 | if (idev) |
| 1016 | in6_dev_put(idev); |
| 1017 | if (rt) |
| 1018 | dst_free((struct dst_entry *) rt); |
| 1019 | return err; |
| 1020 | } |
| 1021 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1022 | int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | { |
| 1024 | int err; |
| 1025 | |
| 1026 | write_lock_bh(&rt6_lock); |
| 1027 | |
| 1028 | rt6_reset_dflt_pointer(NULL); |
| 1029 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1030 | err = fib6_del(rt, nlh, _rtattr, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | dst_release(&rt->u.dst); |
| 1032 | |
| 1033 | write_unlock_bh(&rt6_lock); |
| 1034 | |
| 1035 | return err; |
| 1036 | } |
| 1037 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1038 | static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | { |
| 1040 | struct fib6_node *fn; |
| 1041 | struct rt6_info *rt; |
| 1042 | int err = -ESRCH; |
| 1043 | |
| 1044 | read_lock_bh(&rt6_lock); |
| 1045 | |
| 1046 | fn = fib6_locate(&ip6_routing_table, |
| 1047 | &rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len, |
| 1048 | &rtmsg->rtmsg_src, rtmsg->rtmsg_src_len); |
| 1049 | |
| 1050 | if (fn) { |
| 1051 | for (rt = fn->leaf; rt; rt = rt->u.next) { |
| 1052 | if (rtmsg->rtmsg_ifindex && |
| 1053 | (rt->rt6i_dev == NULL || |
| 1054 | rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex)) |
| 1055 | continue; |
| 1056 | if (rtmsg->rtmsg_flags&RTF_GATEWAY && |
| 1057 | !ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway)) |
| 1058 | continue; |
| 1059 | if (rtmsg->rtmsg_metric && |
| 1060 | rtmsg->rtmsg_metric != rt->rt6i_metric) |
| 1061 | continue; |
| 1062 | dst_hold(&rt->u.dst); |
| 1063 | read_unlock_bh(&rt6_lock); |
| 1064 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1065 | return ip6_del_rt(rt, nlh, _rtattr, req); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | } |
| 1067 | } |
| 1068 | read_unlock_bh(&rt6_lock); |
| 1069 | |
| 1070 | return err; |
| 1071 | } |
| 1072 | |
| 1073 | /* |
| 1074 | * Handle redirects |
| 1075 | */ |
| 1076 | void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr, |
| 1077 | struct neighbour *neigh, u8 *lladdr, int on_link) |
| 1078 | { |
| 1079 | struct rt6_info *rt, *nrt; |
| 1080 | |
| 1081 | /* Locate old route to this destination. */ |
| 1082 | rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1); |
| 1083 | |
| 1084 | if (rt == NULL) |
| 1085 | return; |
| 1086 | |
| 1087 | if (neigh->dev != rt->rt6i_dev) |
| 1088 | goto out; |
| 1089 | |
| 1090 | /* |
| 1091 | * Current route is on-link; redirect is always invalid. |
| 1092 | * |
| 1093 | * Seems, previous statement is not true. It could |
| 1094 | * be node, which looks for us as on-link (f.e. proxy ndisc) |
| 1095 | * But then router serving it might decide, that we should |
| 1096 | * know truth 8)8) --ANK (980726). |
| 1097 | */ |
| 1098 | if (!(rt->rt6i_flags&RTF_GATEWAY)) |
| 1099 | goto out; |
| 1100 | |
| 1101 | /* |
| 1102 | * RFC 2461 specifies that redirects should only be |
| 1103 | * accepted if they come from the nexthop to the target. |
| 1104 | * Due to the way default routers are chosen, this notion |
| 1105 | * is a bit fuzzy and one might need to check all default |
| 1106 | * routers. |
| 1107 | */ |
| 1108 | if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) { |
| 1109 | if (rt->rt6i_flags & RTF_DEFAULT) { |
| 1110 | struct rt6_info *rt1; |
| 1111 | |
| 1112 | read_lock(&rt6_lock); |
| 1113 | for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) { |
| 1114 | if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) { |
| 1115 | dst_hold(&rt1->u.dst); |
| 1116 | dst_release(&rt->u.dst); |
| 1117 | read_unlock(&rt6_lock); |
| 1118 | rt = rt1; |
| 1119 | goto source_ok; |
| 1120 | } |
| 1121 | } |
| 1122 | read_unlock(&rt6_lock); |
| 1123 | } |
| 1124 | if (net_ratelimit()) |
| 1125 | printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop " |
| 1126 | "for redirect target\n"); |
| 1127 | goto out; |
| 1128 | } |
| 1129 | |
| 1130 | source_ok: |
| 1131 | |
| 1132 | /* |
| 1133 | * We have finally decided to accept it. |
| 1134 | */ |
| 1135 | |
| 1136 | neigh_update(neigh, lladdr, NUD_STALE, |
| 1137 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
| 1138 | NEIGH_UPDATE_F_OVERRIDE| |
| 1139 | (on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER| |
| 1140 | NEIGH_UPDATE_F_ISROUTER)) |
| 1141 | ); |
| 1142 | |
| 1143 | /* |
| 1144 | * Redirect received -> path was valid. |
| 1145 | * Look, redirects are sent only in response to data packets, |
| 1146 | * so that this nexthop apparently is reachable. --ANK |
| 1147 | */ |
| 1148 | dst_confirm(&rt->u.dst); |
| 1149 | |
| 1150 | /* Duplicate redirect: silently ignore. */ |
| 1151 | if (neigh == rt->u.dst.neighbour) |
| 1152 | goto out; |
| 1153 | |
| 1154 | nrt = ip6_rt_copy(rt); |
| 1155 | if (nrt == NULL) |
| 1156 | goto out; |
| 1157 | |
| 1158 | nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE; |
| 1159 | if (on_link) |
| 1160 | nrt->rt6i_flags &= ~RTF_GATEWAY; |
| 1161 | |
| 1162 | ipv6_addr_copy(&nrt->rt6i_dst.addr, dest); |
| 1163 | nrt->rt6i_dst.plen = 128; |
| 1164 | nrt->u.dst.flags |= DST_HOST; |
| 1165 | |
| 1166 | ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key); |
| 1167 | nrt->rt6i_nexthop = neigh_clone(neigh); |
| 1168 | /* Reset pmtu, it may be better */ |
| 1169 | nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev); |
| 1170 | nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst)); |
| 1171 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1172 | if (ip6_ins_rt(nrt, NULL, NULL, NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | goto out; |
| 1174 | |
| 1175 | if (rt->rt6i_flags&RTF_CACHE) { |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1176 | ip6_del_rt(rt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | return; |
| 1178 | } |
| 1179 | |
| 1180 | out: |
| 1181 | dst_release(&rt->u.dst); |
| 1182 | return; |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * Handle ICMP "packet too big" messages |
| 1187 | * i.e. Path MTU discovery |
| 1188 | */ |
| 1189 | |
| 1190 | void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr, |
| 1191 | struct net_device *dev, u32 pmtu) |
| 1192 | { |
| 1193 | struct rt6_info *rt, *nrt; |
| 1194 | int allfrag = 0; |
| 1195 | |
| 1196 | rt = rt6_lookup(daddr, saddr, dev->ifindex, 0); |
| 1197 | if (rt == NULL) |
| 1198 | return; |
| 1199 | |
| 1200 | if (pmtu >= dst_mtu(&rt->u.dst)) |
| 1201 | goto out; |
| 1202 | |
| 1203 | if (pmtu < IPV6_MIN_MTU) { |
| 1204 | /* |
| 1205 | * According to RFC2460, PMTU is set to the IPv6 Minimum Link |
| 1206 | * MTU (1280) and a fragment header should always be included |
| 1207 | * after a node receiving Too Big message reporting PMTU is |
| 1208 | * less than the IPv6 Minimum Link MTU. |
| 1209 | */ |
| 1210 | pmtu = IPV6_MIN_MTU; |
| 1211 | allfrag = 1; |
| 1212 | } |
| 1213 | |
| 1214 | /* New mtu received -> path was valid. |
| 1215 | They are sent only in response to data packets, |
| 1216 | so that this nexthop apparently is reachable. --ANK |
| 1217 | */ |
| 1218 | dst_confirm(&rt->u.dst); |
| 1219 | |
| 1220 | /* Host route. If it is static, it would be better |
| 1221 | not to override it, but add new one, so that |
| 1222 | when cache entry will expire old pmtu |
| 1223 | would return automatically. |
| 1224 | */ |
| 1225 | if (rt->rt6i_flags & RTF_CACHE) { |
| 1226 | rt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
| 1227 | if (allfrag) |
| 1228 | rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 1229 | dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires); |
| 1230 | rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES; |
| 1231 | goto out; |
| 1232 | } |
| 1233 | |
| 1234 | /* Network route. |
| 1235 | Two cases are possible: |
| 1236 | 1. It is connected route. Action: COW |
| 1237 | 2. It is gatewayed route or NONEXTHOP route. Action: clone it. |
| 1238 | */ |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1239 | if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1240 | nrt = rt6_alloc_cow(rt, daddr, saddr); |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1241 | else |
| 1242 | nrt = rt6_alloc_clone(rt, daddr); |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1243 | |
YOSHIFUJI Hideaki | d5315b5 | 2006-03-20 16:58:48 -0800 | [diff] [blame] | 1244 | if (nrt) { |
YOSHIFUJI Hideaki | a1e7836 | 2006-03-20 16:56:32 -0800 | [diff] [blame] | 1245 | nrt->u.dst.metrics[RTAX_MTU-1] = pmtu; |
| 1246 | if (allfrag) |
| 1247 | nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG; |
| 1248 | |
| 1249 | /* According to RFC 1981, detecting PMTU increase shouldn't be |
| 1250 | * happened within 5 mins, the recommended timer is 10 mins. |
| 1251 | * Here this route expiration time is set to ip6_rt_mtu_expires |
| 1252 | * which is 10 mins. After 10 mins the decreased pmtu is expired |
| 1253 | * and detecting PMTU increase will be automatically happened. |
| 1254 | */ |
| 1255 | dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires); |
| 1256 | nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES; |
| 1257 | |
| 1258 | ip6_ins_rt(nrt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | out: |
| 1261 | dst_release(&rt->u.dst); |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * Misc support functions |
| 1266 | */ |
| 1267 | |
| 1268 | static struct rt6_info * ip6_rt_copy(struct rt6_info *ort) |
| 1269 | { |
| 1270 | struct rt6_info *rt = ip6_dst_alloc(); |
| 1271 | |
| 1272 | if (rt) { |
| 1273 | rt->u.dst.input = ort->u.dst.input; |
| 1274 | rt->u.dst.output = ort->u.dst.output; |
| 1275 | |
| 1276 | memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32)); |
| 1277 | rt->u.dst.dev = ort->u.dst.dev; |
| 1278 | if (rt->u.dst.dev) |
| 1279 | dev_hold(rt->u.dst.dev); |
| 1280 | rt->rt6i_idev = ort->rt6i_idev; |
| 1281 | if (rt->rt6i_idev) |
| 1282 | in6_dev_hold(rt->rt6i_idev); |
| 1283 | rt->u.dst.lastuse = jiffies; |
| 1284 | rt->rt6i_expires = 0; |
| 1285 | |
| 1286 | ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway); |
| 1287 | rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES; |
| 1288 | rt->rt6i_metric = 0; |
| 1289 | |
| 1290 | memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key)); |
| 1291 | #ifdef CONFIG_IPV6_SUBTREES |
| 1292 | memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key)); |
| 1293 | #endif |
| 1294 | } |
| 1295 | return rt; |
| 1296 | } |
| 1297 | |
| 1298 | struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev) |
| 1299 | { |
| 1300 | struct rt6_info *rt; |
| 1301 | struct fib6_node *fn; |
| 1302 | |
| 1303 | fn = &ip6_routing_table; |
| 1304 | |
| 1305 | write_lock_bh(&rt6_lock); |
| 1306 | for (rt = fn->leaf; rt; rt=rt->u.next) { |
| 1307 | if (dev == rt->rt6i_dev && |
| 1308 | ipv6_addr_equal(&rt->rt6i_gateway, addr)) |
| 1309 | break; |
| 1310 | } |
| 1311 | if (rt) |
| 1312 | dst_hold(&rt->u.dst); |
| 1313 | write_unlock_bh(&rt6_lock); |
| 1314 | return rt; |
| 1315 | } |
| 1316 | |
| 1317 | struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr, |
| 1318 | struct net_device *dev) |
| 1319 | { |
| 1320 | struct in6_rtmsg rtmsg; |
| 1321 | |
| 1322 | memset(&rtmsg, 0, sizeof(struct in6_rtmsg)); |
| 1323 | rtmsg.rtmsg_type = RTMSG_NEWROUTE; |
| 1324 | ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr); |
| 1325 | rtmsg.rtmsg_metric = 1024; |
| 1326 | rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES; |
| 1327 | |
| 1328 | rtmsg.rtmsg_ifindex = dev->ifindex; |
| 1329 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1330 | ip6_route_add(&rtmsg, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | return rt6_get_dflt_router(gwaddr, dev); |
| 1332 | } |
| 1333 | |
| 1334 | void rt6_purge_dflt_routers(void) |
| 1335 | { |
| 1336 | struct rt6_info *rt; |
| 1337 | |
| 1338 | restart: |
| 1339 | read_lock_bh(&rt6_lock); |
| 1340 | for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) { |
| 1341 | if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) { |
| 1342 | dst_hold(&rt->u.dst); |
| 1343 | |
| 1344 | rt6_reset_dflt_pointer(NULL); |
| 1345 | |
| 1346 | read_unlock_bh(&rt6_lock); |
| 1347 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1348 | ip6_del_rt(rt, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
| 1350 | goto restart; |
| 1351 | } |
| 1352 | } |
| 1353 | read_unlock_bh(&rt6_lock); |
| 1354 | } |
| 1355 | |
| 1356 | int ipv6_route_ioctl(unsigned int cmd, void __user *arg) |
| 1357 | { |
| 1358 | struct in6_rtmsg rtmsg; |
| 1359 | int err; |
| 1360 | |
| 1361 | switch(cmd) { |
| 1362 | case SIOCADDRT: /* Add a route */ |
| 1363 | case SIOCDELRT: /* Delete a route */ |
| 1364 | if (!capable(CAP_NET_ADMIN)) |
| 1365 | return -EPERM; |
| 1366 | err = copy_from_user(&rtmsg, arg, |
| 1367 | sizeof(struct in6_rtmsg)); |
| 1368 | if (err) |
| 1369 | return -EFAULT; |
| 1370 | |
| 1371 | rtnl_lock(); |
| 1372 | switch (cmd) { |
| 1373 | case SIOCADDRT: |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1374 | err = ip6_route_add(&rtmsg, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1375 | break; |
| 1376 | case SIOCDELRT: |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1377 | err = ip6_route_del(&rtmsg, NULL, NULL, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | break; |
| 1379 | default: |
| 1380 | err = -EINVAL; |
| 1381 | } |
| 1382 | rtnl_unlock(); |
| 1383 | |
| 1384 | return err; |
| 1385 | }; |
| 1386 | |
| 1387 | return -EINVAL; |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Drop the packet on the floor |
| 1392 | */ |
| 1393 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1394 | static int ip6_pkt_discard(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | { |
| 1396 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); |
| 1397 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev); |
| 1398 | kfree_skb(skb); |
| 1399 | return 0; |
| 1400 | } |
| 1401 | |
Arnaldo Carvalho de Melo | 2038073 | 2005-08-16 02:18:02 -0300 | [diff] [blame] | 1402 | static int ip6_pkt_discard_out(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | { |
| 1404 | skb->dev = skb->dst->dev; |
| 1405 | return ip6_pkt_discard(skb); |
| 1406 | } |
| 1407 | |
| 1408 | /* |
| 1409 | * Allocate a dst for local (unicast / anycast) address. |
| 1410 | */ |
| 1411 | |
| 1412 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, |
| 1413 | const struct in6_addr *addr, |
| 1414 | int anycast) |
| 1415 | { |
| 1416 | struct rt6_info *rt = ip6_dst_alloc(); |
| 1417 | |
| 1418 | if (rt == NULL) |
| 1419 | return ERR_PTR(-ENOMEM); |
| 1420 | |
| 1421 | dev_hold(&loopback_dev); |
| 1422 | in6_dev_hold(idev); |
| 1423 | |
| 1424 | rt->u.dst.flags = DST_HOST; |
| 1425 | rt->u.dst.input = ip6_input; |
| 1426 | rt->u.dst.output = ip6_output; |
| 1427 | rt->rt6i_dev = &loopback_dev; |
| 1428 | rt->rt6i_idev = idev; |
| 1429 | rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev); |
| 1430 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst)); |
| 1431 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1; |
| 1432 | rt->u.dst.obsolete = -1; |
| 1433 | |
| 1434 | rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; |
YOSHIFUJI Hideaki | 58c4fb8 | 2005-12-21 22:56:42 +0900 | [diff] [blame] | 1435 | if (anycast) |
| 1436 | rt->rt6i_flags |= RTF_ANYCAST; |
| 1437 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | rt->rt6i_flags |= RTF_LOCAL; |
| 1439 | rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); |
| 1440 | if (rt->rt6i_nexthop == NULL) { |
| 1441 | dst_free((struct dst_entry *) rt); |
| 1442 | return ERR_PTR(-ENOMEM); |
| 1443 | } |
| 1444 | |
| 1445 | ipv6_addr_copy(&rt->rt6i_dst.addr, addr); |
| 1446 | rt->rt6i_dst.plen = 128; |
| 1447 | |
| 1448 | atomic_set(&rt->u.dst.__refcnt, 1); |
| 1449 | |
| 1450 | return rt; |
| 1451 | } |
| 1452 | |
| 1453 | static int fib6_ifdown(struct rt6_info *rt, void *arg) |
| 1454 | { |
| 1455 | if (((void*)rt->rt6i_dev == arg || arg == NULL) && |
| 1456 | rt != &ip6_null_entry) { |
| 1457 | RT6_TRACE("deleted by ifdown %p\n", rt); |
| 1458 | return -1; |
| 1459 | } |
| 1460 | return 0; |
| 1461 | } |
| 1462 | |
| 1463 | void rt6_ifdown(struct net_device *dev) |
| 1464 | { |
| 1465 | write_lock_bh(&rt6_lock); |
| 1466 | fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev); |
| 1467 | write_unlock_bh(&rt6_lock); |
| 1468 | } |
| 1469 | |
| 1470 | struct rt6_mtu_change_arg |
| 1471 | { |
| 1472 | struct net_device *dev; |
| 1473 | unsigned mtu; |
| 1474 | }; |
| 1475 | |
| 1476 | static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg) |
| 1477 | { |
| 1478 | struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg; |
| 1479 | struct inet6_dev *idev; |
| 1480 | |
| 1481 | /* In IPv6 pmtu discovery is not optional, |
| 1482 | so that RTAX_MTU lock cannot disable it. |
| 1483 | We still use this lock to block changes |
| 1484 | caused by addrconf/ndisc. |
| 1485 | */ |
| 1486 | |
| 1487 | idev = __in6_dev_get(arg->dev); |
| 1488 | if (idev == NULL) |
| 1489 | return 0; |
| 1490 | |
| 1491 | /* For administrative MTU increase, there is no way to discover |
| 1492 | IPv6 PMTU increase, so PMTU increase should be updated here. |
| 1493 | Since RFC 1981 doesn't include administrative MTU increase |
| 1494 | update PMTU increase is a MUST. (i.e. jumbo frame) |
| 1495 | */ |
| 1496 | /* |
| 1497 | If new MTU is less than route PMTU, this new MTU will be the |
| 1498 | lowest MTU in the path, update the route PMTU to reflect PMTU |
| 1499 | decreases; if new MTU is greater than route PMTU, and the |
| 1500 | old MTU is the lowest MTU in the path, update the route PMTU |
| 1501 | to reflect the increase. In this case if the other nodes' MTU |
| 1502 | also have the lowest MTU, TOO BIG MESSAGE will be lead to |
| 1503 | PMTU discouvery. |
| 1504 | */ |
| 1505 | if (rt->rt6i_dev == arg->dev && |
| 1506 | !dst_metric_locked(&rt->u.dst, RTAX_MTU) && |
| 1507 | (dst_mtu(&rt->u.dst) > arg->mtu || |
| 1508 | (dst_mtu(&rt->u.dst) < arg->mtu && |
| 1509 | dst_mtu(&rt->u.dst) == idev->cnf.mtu6))) |
| 1510 | rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu; |
| 1511 | rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu); |
| 1512 | return 0; |
| 1513 | } |
| 1514 | |
| 1515 | void rt6_mtu_change(struct net_device *dev, unsigned mtu) |
| 1516 | { |
| 1517 | struct rt6_mtu_change_arg arg; |
| 1518 | |
| 1519 | arg.dev = dev; |
| 1520 | arg.mtu = mtu; |
| 1521 | read_lock_bh(&rt6_lock); |
| 1522 | fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg); |
| 1523 | read_unlock_bh(&rt6_lock); |
| 1524 | } |
| 1525 | |
| 1526 | static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta, |
| 1527 | struct in6_rtmsg *rtmsg) |
| 1528 | { |
| 1529 | memset(rtmsg, 0, sizeof(*rtmsg)); |
| 1530 | |
| 1531 | rtmsg->rtmsg_dst_len = r->rtm_dst_len; |
| 1532 | rtmsg->rtmsg_src_len = r->rtm_src_len; |
| 1533 | rtmsg->rtmsg_flags = RTF_UP; |
| 1534 | if (r->rtm_type == RTN_UNREACHABLE) |
| 1535 | rtmsg->rtmsg_flags |= RTF_REJECT; |
| 1536 | |
| 1537 | if (rta[RTA_GATEWAY-1]) { |
| 1538 | if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16)) |
| 1539 | return -EINVAL; |
| 1540 | memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16); |
| 1541 | rtmsg->rtmsg_flags |= RTF_GATEWAY; |
| 1542 | } |
| 1543 | if (rta[RTA_DST-1]) { |
| 1544 | if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3)) |
| 1545 | return -EINVAL; |
| 1546 | memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3)); |
| 1547 | } |
| 1548 | if (rta[RTA_SRC-1]) { |
| 1549 | if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3)) |
| 1550 | return -EINVAL; |
| 1551 | memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3)); |
| 1552 | } |
| 1553 | if (rta[RTA_OIF-1]) { |
| 1554 | if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int))) |
| 1555 | return -EINVAL; |
| 1556 | memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); |
| 1557 | } |
| 1558 | if (rta[RTA_PRIORITY-1]) { |
| 1559 | if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4)) |
| 1560 | return -EINVAL; |
| 1561 | memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4); |
| 1562 | } |
| 1563 | return 0; |
| 1564 | } |
| 1565 | |
| 1566 | int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 1567 | { |
| 1568 | struct rtmsg *r = NLMSG_DATA(nlh); |
| 1569 | struct in6_rtmsg rtmsg; |
| 1570 | |
| 1571 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) |
| 1572 | return -EINVAL; |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1573 | return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | } |
| 1575 | |
| 1576 | int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg) |
| 1577 | { |
| 1578 | struct rtmsg *r = NLMSG_DATA(nlh); |
| 1579 | struct in6_rtmsg rtmsg; |
| 1580 | |
| 1581 | if (inet6_rtm_to_rtmsg(r, arg, &rtmsg)) |
| 1582 | return -EINVAL; |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1583 | return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | } |
| 1585 | |
| 1586 | struct rt6_rtnl_dump_arg |
| 1587 | { |
| 1588 | struct sk_buff *skb; |
| 1589 | struct netlink_callback *cb; |
| 1590 | }; |
| 1591 | |
| 1592 | static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1593 | struct in6_addr *dst, struct in6_addr *src, |
| 1594 | int iif, int type, u32 pid, u32 seq, |
| 1595 | int prefix, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | { |
| 1597 | struct rtmsg *rtm; |
| 1598 | struct nlmsghdr *nlh; |
| 1599 | unsigned char *b = skb->tail; |
| 1600 | struct rta_cacheinfo ci; |
| 1601 | |
| 1602 | if (prefix) { /* user wants prefix routes only */ |
| 1603 | if (!(rt->rt6i_flags & RTF_PREFIX_RT)) { |
| 1604 | /* success since this is not a prefix route */ |
| 1605 | return 1; |
| 1606 | } |
| 1607 | } |
| 1608 | |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 1609 | nlh = NLMSG_NEW(skb, pid, seq, type, sizeof(*rtm), flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | rtm = NLMSG_DATA(nlh); |
| 1611 | rtm->rtm_family = AF_INET6; |
| 1612 | rtm->rtm_dst_len = rt->rt6i_dst.plen; |
| 1613 | rtm->rtm_src_len = rt->rt6i_src.plen; |
| 1614 | rtm->rtm_tos = 0; |
| 1615 | rtm->rtm_table = RT_TABLE_MAIN; |
| 1616 | if (rt->rt6i_flags&RTF_REJECT) |
| 1617 | rtm->rtm_type = RTN_UNREACHABLE; |
| 1618 | else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK)) |
| 1619 | rtm->rtm_type = RTN_LOCAL; |
| 1620 | else |
| 1621 | rtm->rtm_type = RTN_UNICAST; |
| 1622 | rtm->rtm_flags = 0; |
| 1623 | rtm->rtm_scope = RT_SCOPE_UNIVERSE; |
| 1624 | rtm->rtm_protocol = rt->rt6i_protocol; |
| 1625 | if (rt->rt6i_flags&RTF_DYNAMIC) |
| 1626 | rtm->rtm_protocol = RTPROT_REDIRECT; |
| 1627 | else if (rt->rt6i_flags & RTF_ADDRCONF) |
| 1628 | rtm->rtm_protocol = RTPROT_KERNEL; |
| 1629 | else if (rt->rt6i_flags&RTF_DEFAULT) |
| 1630 | rtm->rtm_protocol = RTPROT_RA; |
| 1631 | |
| 1632 | if (rt->rt6i_flags&RTF_CACHE) |
| 1633 | rtm->rtm_flags |= RTM_F_CLONED; |
| 1634 | |
| 1635 | if (dst) { |
| 1636 | RTA_PUT(skb, RTA_DST, 16, dst); |
| 1637 | rtm->rtm_dst_len = 128; |
| 1638 | } else if (rtm->rtm_dst_len) |
| 1639 | RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr); |
| 1640 | #ifdef CONFIG_IPV6_SUBTREES |
| 1641 | if (src) { |
| 1642 | RTA_PUT(skb, RTA_SRC, 16, src); |
| 1643 | rtm->rtm_src_len = 128; |
| 1644 | } else if (rtm->rtm_src_len) |
| 1645 | RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr); |
| 1646 | #endif |
| 1647 | if (iif) |
| 1648 | RTA_PUT(skb, RTA_IIF, 4, &iif); |
| 1649 | else if (dst) { |
| 1650 | struct in6_addr saddr_buf; |
| 1651 | if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0) |
| 1652 | RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); |
| 1653 | } |
| 1654 | if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0) |
| 1655 | goto rtattr_failure; |
| 1656 | if (rt->u.dst.neighbour) |
| 1657 | RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key); |
| 1658 | if (rt->u.dst.dev) |
| 1659 | RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex); |
| 1660 | RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric); |
| 1661 | ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse); |
| 1662 | if (rt->rt6i_expires) |
| 1663 | ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies); |
| 1664 | else |
| 1665 | ci.rta_expires = 0; |
| 1666 | ci.rta_used = rt->u.dst.__use; |
| 1667 | ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt); |
| 1668 | ci.rta_error = rt->u.dst.error; |
| 1669 | ci.rta_id = 0; |
| 1670 | ci.rta_ts = 0; |
| 1671 | ci.rta_tsage = 0; |
| 1672 | RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci); |
| 1673 | nlh->nlmsg_len = skb->tail - b; |
| 1674 | return skb->len; |
| 1675 | |
| 1676 | nlmsg_failure: |
| 1677 | rtattr_failure: |
| 1678 | skb_trim(skb, b - skb->data); |
| 1679 | return -1; |
| 1680 | } |
| 1681 | |
| 1682 | static int rt6_dump_route(struct rt6_info *rt, void *p_arg) |
| 1683 | { |
| 1684 | struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg; |
| 1685 | int prefix; |
| 1686 | |
| 1687 | if (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(sizeof(struct rtmsg))) { |
| 1688 | struct rtmsg *rtm = NLMSG_DATA(arg->cb->nlh); |
| 1689 | prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0; |
| 1690 | } else |
| 1691 | prefix = 0; |
| 1692 | |
| 1693 | return rt6_fill_node(arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE, |
| 1694 | NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1695 | prefix, NLM_F_MULTI); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | } |
| 1697 | |
| 1698 | static int fib6_dump_node(struct fib6_walker_t *w) |
| 1699 | { |
| 1700 | int res; |
| 1701 | struct rt6_info *rt; |
| 1702 | |
| 1703 | for (rt = w->leaf; rt; rt = rt->u.next) { |
| 1704 | res = rt6_dump_route(rt, w->args); |
| 1705 | if (res < 0) { |
| 1706 | /* Frame is full, suspend walking */ |
| 1707 | w->leaf = rt; |
| 1708 | return 1; |
| 1709 | } |
| 1710 | BUG_TRAP(res!=0); |
| 1711 | } |
| 1712 | w->leaf = NULL; |
| 1713 | return 0; |
| 1714 | } |
| 1715 | |
| 1716 | static void fib6_dump_end(struct netlink_callback *cb) |
| 1717 | { |
| 1718 | struct fib6_walker_t *w = (void*)cb->args[0]; |
| 1719 | |
| 1720 | if (w) { |
| 1721 | cb->args[0] = 0; |
| 1722 | fib6_walker_unlink(w); |
| 1723 | kfree(w); |
| 1724 | } |
Herbert Xu | efacfbc | 2005-11-12 12:12:05 -0800 | [diff] [blame] | 1725 | cb->done = (void*)cb->args[1]; |
| 1726 | cb->args[1] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | } |
| 1728 | |
| 1729 | static int fib6_dump_done(struct netlink_callback *cb) |
| 1730 | { |
| 1731 | fib6_dump_end(cb); |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 1732 | return cb->done ? cb->done(cb) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
| 1735 | int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
| 1736 | { |
| 1737 | struct rt6_rtnl_dump_arg arg; |
| 1738 | struct fib6_walker_t *w; |
| 1739 | int res; |
| 1740 | |
| 1741 | arg.skb = skb; |
| 1742 | arg.cb = cb; |
| 1743 | |
| 1744 | w = (void*)cb->args[0]; |
| 1745 | if (w == NULL) { |
| 1746 | /* New dump: |
| 1747 | * |
| 1748 | * 1. hook callback destructor. |
| 1749 | */ |
| 1750 | cb->args[1] = (long)cb->done; |
| 1751 | cb->done = fib6_dump_done; |
| 1752 | |
| 1753 | /* |
| 1754 | * 2. allocate and initialize walker. |
| 1755 | */ |
David S. Miller | 9e147a1 | 2005-11-17 16:52:51 -0800 | [diff] [blame] | 1756 | w = kmalloc(sizeof(*w), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | if (w == NULL) |
| 1758 | return -ENOMEM; |
| 1759 | RT6_TRACE("dump<%p", w); |
| 1760 | memset(w, 0, sizeof(*w)); |
| 1761 | w->root = &ip6_routing_table; |
| 1762 | w->func = fib6_dump_node; |
| 1763 | w->args = &arg; |
| 1764 | cb->args[0] = (long)w; |
| 1765 | read_lock_bh(&rt6_lock); |
| 1766 | res = fib6_walk(w); |
| 1767 | read_unlock_bh(&rt6_lock); |
| 1768 | } else { |
| 1769 | w->args = &arg; |
| 1770 | read_lock_bh(&rt6_lock); |
| 1771 | res = fib6_walk_continue(w); |
| 1772 | read_unlock_bh(&rt6_lock); |
| 1773 | } |
| 1774 | #if RT6_DEBUG >= 3 |
| 1775 | if (res <= 0 && skb->len == 0) |
| 1776 | RT6_TRACE("%p>dump end\n", w); |
| 1777 | #endif |
| 1778 | res = res < 0 ? res : skb->len; |
| 1779 | /* res < 0 is an error. (really, impossible) |
| 1780 | res == 0 means that dump is complete, but skb still can contain data. |
| 1781 | res > 0 dump is not complete, but frame is full. |
| 1782 | */ |
| 1783 | /* Destroy walker, if dump of this table is complete. */ |
| 1784 | if (res <= 0) |
| 1785 | fib6_dump_end(cb); |
| 1786 | return res; |
| 1787 | } |
| 1788 | |
| 1789 | int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) |
| 1790 | { |
| 1791 | struct rtattr **rta = arg; |
| 1792 | int iif = 0; |
| 1793 | int err = -ENOBUFS; |
| 1794 | struct sk_buff *skb; |
| 1795 | struct flowi fl; |
| 1796 | struct rt6_info *rt; |
| 1797 | |
| 1798 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| 1799 | if (skb == NULL) |
| 1800 | goto out; |
| 1801 | |
| 1802 | /* Reserve room for dummy headers, this skb can pass |
| 1803 | through good chunk of routing engine. |
| 1804 | */ |
| 1805 | skb->mac.raw = skb->data; |
| 1806 | skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr)); |
| 1807 | |
| 1808 | memset(&fl, 0, sizeof(fl)); |
| 1809 | if (rta[RTA_SRC-1]) |
| 1810 | ipv6_addr_copy(&fl.fl6_src, |
| 1811 | (struct in6_addr*)RTA_DATA(rta[RTA_SRC-1])); |
| 1812 | if (rta[RTA_DST-1]) |
| 1813 | ipv6_addr_copy(&fl.fl6_dst, |
| 1814 | (struct in6_addr*)RTA_DATA(rta[RTA_DST-1])); |
| 1815 | |
| 1816 | if (rta[RTA_IIF-1]) |
| 1817 | memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int)); |
| 1818 | |
| 1819 | if (iif) { |
| 1820 | struct net_device *dev; |
| 1821 | dev = __dev_get_by_index(iif); |
| 1822 | if (!dev) { |
| 1823 | err = -ENODEV; |
| 1824 | goto out_free; |
| 1825 | } |
| 1826 | } |
| 1827 | |
| 1828 | fl.oif = 0; |
| 1829 | if (rta[RTA_OIF-1]) |
| 1830 | memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int)); |
| 1831 | |
| 1832 | rt = (struct rt6_info*)ip6_route_output(NULL, &fl); |
| 1833 | |
| 1834 | skb->dst = &rt->u.dst; |
| 1835 | |
| 1836 | NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; |
| 1837 | err = rt6_fill_node(skb, rt, |
| 1838 | &fl.fl6_dst, &fl.fl6_src, |
| 1839 | iif, |
| 1840 | RTM_NEWROUTE, NETLINK_CB(in_skb).pid, |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1841 | nlh->nlmsg_seq, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | if (err < 0) { |
| 1843 | err = -EMSGSIZE; |
| 1844 | goto out_free; |
| 1845 | } |
| 1846 | |
| 1847 | err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); |
| 1848 | if (err > 0) |
| 1849 | err = 0; |
| 1850 | out: |
| 1851 | return err; |
| 1852 | out_free: |
| 1853 | kfree_skb(skb); |
| 1854 | goto out; |
| 1855 | } |
| 1856 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1857 | void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh, |
| 1858 | struct netlink_skb_parms *req) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1859 | { |
| 1860 | struct sk_buff *skb; |
| 1861 | int size = NLMSG_SPACE(sizeof(struct rtmsg)+256); |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1862 | u32 pid = current->pid; |
| 1863 | u32 seq = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1864 | |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1865 | if (req) |
| 1866 | pid = req->pid; |
| 1867 | if (nlh) |
| 1868 | seq = nlh->nlmsg_seq; |
| 1869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | skb = alloc_skb(size, gfp_any()); |
| 1871 | if (!skb) { |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1872 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | return; |
| 1874 | } |
Jamal Hadi Salim | 0d51aa8 | 2005-06-21 13:51:04 -0700 | [diff] [blame] | 1875 | if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1876 | kfree_skb(skb); |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1877 | netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | return; |
| 1879 | } |
Patrick McHardy | ac6d439 | 2005-08-14 19:29:52 -0700 | [diff] [blame] | 1880 | NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE; |
| 1881 | netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | } |
| 1883 | |
| 1884 | /* |
| 1885 | * /proc |
| 1886 | */ |
| 1887 | |
| 1888 | #ifdef CONFIG_PROC_FS |
| 1889 | |
| 1890 | #define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1) |
| 1891 | |
| 1892 | struct rt6_proc_arg |
| 1893 | { |
| 1894 | char *buffer; |
| 1895 | int offset; |
| 1896 | int length; |
| 1897 | int skip; |
| 1898 | int len; |
| 1899 | }; |
| 1900 | |
| 1901 | static int rt6_info_route(struct rt6_info *rt, void *p_arg) |
| 1902 | { |
| 1903 | struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg; |
| 1904 | int i; |
| 1905 | |
| 1906 | if (arg->skip < arg->offset / RT6_INFO_LEN) { |
| 1907 | arg->skip++; |
| 1908 | return 0; |
| 1909 | } |
| 1910 | |
| 1911 | if (arg->len >= arg->length) |
| 1912 | return 0; |
| 1913 | |
| 1914 | for (i=0; i<16; i++) { |
| 1915 | sprintf(arg->buffer + arg->len, "%02x", |
| 1916 | rt->rt6i_dst.addr.s6_addr[i]); |
| 1917 | arg->len += 2; |
| 1918 | } |
| 1919 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", |
| 1920 | rt->rt6i_dst.plen); |
| 1921 | |
| 1922 | #ifdef CONFIG_IPV6_SUBTREES |
| 1923 | for (i=0; i<16; i++) { |
| 1924 | sprintf(arg->buffer + arg->len, "%02x", |
| 1925 | rt->rt6i_src.addr.s6_addr[i]); |
| 1926 | arg->len += 2; |
| 1927 | } |
| 1928 | arg->len += sprintf(arg->buffer + arg->len, " %02x ", |
| 1929 | rt->rt6i_src.plen); |
| 1930 | #else |
| 1931 | sprintf(arg->buffer + arg->len, |
| 1932 | "00000000000000000000000000000000 00 "); |
| 1933 | arg->len += 36; |
| 1934 | #endif |
| 1935 | |
| 1936 | if (rt->rt6i_nexthop) { |
| 1937 | for (i=0; i<16; i++) { |
| 1938 | sprintf(arg->buffer + arg->len, "%02x", |
| 1939 | rt->rt6i_nexthop->primary_key[i]); |
| 1940 | arg->len += 2; |
| 1941 | } |
| 1942 | } else { |
| 1943 | sprintf(arg->buffer + arg->len, |
| 1944 | "00000000000000000000000000000000"); |
| 1945 | arg->len += 32; |
| 1946 | } |
| 1947 | arg->len += sprintf(arg->buffer + arg->len, |
| 1948 | " %08x %08x %08x %08x %8s\n", |
| 1949 | rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt), |
| 1950 | rt->u.dst.__use, rt->rt6i_flags, |
| 1951 | rt->rt6i_dev ? rt->rt6i_dev->name : ""); |
| 1952 | return 0; |
| 1953 | } |
| 1954 | |
| 1955 | static int rt6_proc_info(char *buffer, char **start, off_t offset, int length) |
| 1956 | { |
| 1957 | struct rt6_proc_arg arg; |
| 1958 | arg.buffer = buffer; |
| 1959 | arg.offset = offset; |
| 1960 | arg.length = length; |
| 1961 | arg.skip = 0; |
| 1962 | arg.len = 0; |
| 1963 | |
| 1964 | read_lock_bh(&rt6_lock); |
| 1965 | fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg); |
| 1966 | read_unlock_bh(&rt6_lock); |
| 1967 | |
| 1968 | *start = buffer; |
| 1969 | if (offset) |
| 1970 | *start += offset % RT6_INFO_LEN; |
| 1971 | |
| 1972 | arg.len -= offset % RT6_INFO_LEN; |
| 1973 | |
| 1974 | if (arg.len > length) |
| 1975 | arg.len = length; |
| 1976 | if (arg.len < 0) |
| 1977 | arg.len = 0; |
| 1978 | |
| 1979 | return arg.len; |
| 1980 | } |
| 1981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | static int rt6_stats_seq_show(struct seq_file *seq, void *v) |
| 1983 | { |
| 1984 | seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n", |
| 1985 | rt6_stats.fib_nodes, rt6_stats.fib_route_nodes, |
| 1986 | rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries, |
| 1987 | rt6_stats.fib_rt_cache, |
| 1988 | atomic_read(&ip6_dst_ops.entries), |
| 1989 | rt6_stats.fib_discarded_routes); |
| 1990 | |
| 1991 | return 0; |
| 1992 | } |
| 1993 | |
| 1994 | static int rt6_stats_seq_open(struct inode *inode, struct file *file) |
| 1995 | { |
| 1996 | return single_open(file, rt6_stats_seq_show, NULL); |
| 1997 | } |
| 1998 | |
| 1999 | static struct file_operations rt6_stats_seq_fops = { |
| 2000 | .owner = THIS_MODULE, |
| 2001 | .open = rt6_stats_seq_open, |
| 2002 | .read = seq_read, |
| 2003 | .llseek = seq_lseek, |
| 2004 | .release = single_release, |
| 2005 | }; |
| 2006 | #endif /* CONFIG_PROC_FS */ |
| 2007 | |
| 2008 | #ifdef CONFIG_SYSCTL |
| 2009 | |
| 2010 | static int flush_delay; |
| 2011 | |
| 2012 | static |
| 2013 | int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp, |
| 2014 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2015 | { |
| 2016 | if (write) { |
| 2017 | proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
| 2018 | fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay); |
| 2019 | return 0; |
| 2020 | } else |
| 2021 | return -EINVAL; |
| 2022 | } |
| 2023 | |
| 2024 | ctl_table ipv6_route_table[] = { |
| 2025 | { |
| 2026 | .ctl_name = NET_IPV6_ROUTE_FLUSH, |
| 2027 | .procname = "flush", |
| 2028 | .data = &flush_delay, |
| 2029 | .maxlen = sizeof(int), |
Dave Jones | 89c8b3a | 2005-04-28 12:11:49 -0700 | [diff] [blame] | 2030 | .mode = 0200, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | .proc_handler = &ipv6_sysctl_rtcache_flush |
| 2032 | }, |
| 2033 | { |
| 2034 | .ctl_name = NET_IPV6_ROUTE_GC_THRESH, |
| 2035 | .procname = "gc_thresh", |
| 2036 | .data = &ip6_dst_ops.gc_thresh, |
| 2037 | .maxlen = sizeof(int), |
| 2038 | .mode = 0644, |
| 2039 | .proc_handler = &proc_dointvec, |
| 2040 | }, |
| 2041 | { |
| 2042 | .ctl_name = NET_IPV6_ROUTE_MAX_SIZE, |
| 2043 | .procname = "max_size", |
| 2044 | .data = &ip6_rt_max_size, |
| 2045 | .maxlen = sizeof(int), |
| 2046 | .mode = 0644, |
| 2047 | .proc_handler = &proc_dointvec, |
| 2048 | }, |
| 2049 | { |
| 2050 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL, |
| 2051 | .procname = "gc_min_interval", |
| 2052 | .data = &ip6_rt_gc_min_interval, |
| 2053 | .maxlen = sizeof(int), |
| 2054 | .mode = 0644, |
| 2055 | .proc_handler = &proc_dointvec_jiffies, |
| 2056 | .strategy = &sysctl_jiffies, |
| 2057 | }, |
| 2058 | { |
| 2059 | .ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT, |
| 2060 | .procname = "gc_timeout", |
| 2061 | .data = &ip6_rt_gc_timeout, |
| 2062 | .maxlen = sizeof(int), |
| 2063 | .mode = 0644, |
| 2064 | .proc_handler = &proc_dointvec_jiffies, |
| 2065 | .strategy = &sysctl_jiffies, |
| 2066 | }, |
| 2067 | { |
| 2068 | .ctl_name = NET_IPV6_ROUTE_GC_INTERVAL, |
| 2069 | .procname = "gc_interval", |
| 2070 | .data = &ip6_rt_gc_interval, |
| 2071 | .maxlen = sizeof(int), |
| 2072 | .mode = 0644, |
| 2073 | .proc_handler = &proc_dointvec_jiffies, |
| 2074 | .strategy = &sysctl_jiffies, |
| 2075 | }, |
| 2076 | { |
| 2077 | .ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY, |
| 2078 | .procname = "gc_elasticity", |
| 2079 | .data = &ip6_rt_gc_elasticity, |
| 2080 | .maxlen = sizeof(int), |
| 2081 | .mode = 0644, |
| 2082 | .proc_handler = &proc_dointvec_jiffies, |
| 2083 | .strategy = &sysctl_jiffies, |
| 2084 | }, |
| 2085 | { |
| 2086 | .ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES, |
| 2087 | .procname = "mtu_expires", |
| 2088 | .data = &ip6_rt_mtu_expires, |
| 2089 | .maxlen = sizeof(int), |
| 2090 | .mode = 0644, |
| 2091 | .proc_handler = &proc_dointvec_jiffies, |
| 2092 | .strategy = &sysctl_jiffies, |
| 2093 | }, |
| 2094 | { |
| 2095 | .ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS, |
| 2096 | .procname = "min_adv_mss", |
| 2097 | .data = &ip6_rt_min_advmss, |
| 2098 | .maxlen = sizeof(int), |
| 2099 | .mode = 0644, |
| 2100 | .proc_handler = &proc_dointvec_jiffies, |
| 2101 | .strategy = &sysctl_jiffies, |
| 2102 | }, |
| 2103 | { |
| 2104 | .ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS, |
| 2105 | .procname = "gc_min_interval_ms", |
| 2106 | .data = &ip6_rt_gc_min_interval, |
| 2107 | .maxlen = sizeof(int), |
| 2108 | .mode = 0644, |
| 2109 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 2110 | .strategy = &sysctl_ms_jiffies, |
| 2111 | }, |
| 2112 | { .ctl_name = 0 } |
| 2113 | }; |
| 2114 | |
| 2115 | #endif |
| 2116 | |
| 2117 | void __init ip6_route_init(void) |
| 2118 | { |
| 2119 | struct proc_dir_entry *p; |
| 2120 | |
| 2121 | ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache", |
| 2122 | sizeof(struct rt6_info), |
| 2123 | 0, SLAB_HWCACHE_ALIGN, |
| 2124 | NULL, NULL); |
| 2125 | if (!ip6_dst_ops.kmem_cachep) |
| 2126 | panic("cannot create ip6_dst_cache"); |
| 2127 | |
| 2128 | fib6_init(); |
| 2129 | #ifdef CONFIG_PROC_FS |
| 2130 | p = proc_net_create("ipv6_route", 0, rt6_proc_info); |
| 2131 | if (p) |
| 2132 | p->owner = THIS_MODULE; |
| 2133 | |
| 2134 | proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops); |
| 2135 | #endif |
| 2136 | #ifdef CONFIG_XFRM |
| 2137 | xfrm6_init(); |
| 2138 | #endif |
| 2139 | } |
| 2140 | |
| 2141 | void ip6_route_cleanup(void) |
| 2142 | { |
| 2143 | #ifdef CONFIG_PROC_FS |
| 2144 | proc_net_remove("ipv6_route"); |
| 2145 | proc_net_remove("rt6_stats"); |
| 2146 | #endif |
| 2147 | #ifdef CONFIG_XFRM |
| 2148 | xfrm6_fini(); |
| 2149 | #endif |
| 2150 | rt6_ifdown(NULL); |
| 2151 | fib6_gc_cleanup(); |
| 2152 | kmem_cache_destroy(ip6_dst_ops.kmem_cachep); |
| 2153 | } |