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Commit | Line | Data |
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1da177e4 | 1 | /* |
1ab1457c | 2 | * Linux INET6 implementation |
1da177e4 LT |
3 | * Forwarding Information Database |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
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 | /* | |
15 | * Changes: | |
16 | * Yuji SEKIYA @USAGI: Support default route on router node; | |
17 | * remove ip6_null_entry from the top of | |
18 | * routing table. | |
c0bece9f | 19 | * Ville Nuorvala: Fixed routing subtrees. |
1da177e4 | 20 | */ |
f3213831 JP |
21 | |
22 | #define pr_fmt(fmt) "IPv6: " fmt | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/net.h> | |
27 | #include <linux/route.h> | |
28 | #include <linux/netdevice.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/init.h> | |
c71099ac | 31 | #include <linux/list.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
1da177e4 | 33 | |
1da177e4 LT |
34 | #include <net/ipv6.h> |
35 | #include <net/ndisc.h> | |
36 | #include <net/addrconf.h> | |
37 | ||
38 | #include <net/ip6_fib.h> | |
39 | #include <net/ip6_route.h> | |
40 | ||
41 | #define RT6_DEBUG 2 | |
42 | ||
43 | #if RT6_DEBUG >= 3 | |
91df42be | 44 | #define RT6_TRACE(x...) pr_debug(x) |
1da177e4 LT |
45 | #else |
46 | #define RT6_TRACE(x...) do { ; } while (0) | |
47 | #endif | |
48 | ||
e18b890b | 49 | static struct kmem_cache * fib6_node_kmem __read_mostly; |
1da177e4 LT |
50 | |
51 | enum fib_walk_state_t | |
52 | { | |
53 | #ifdef CONFIG_IPV6_SUBTREES | |
54 | FWS_S, | |
55 | #endif | |
56 | FWS_L, | |
57 | FWS_R, | |
58 | FWS_C, | |
59 | FWS_U | |
60 | }; | |
61 | ||
62 | struct fib6_cleaner_t | |
63 | { | |
64 | struct fib6_walker_t w; | |
ec7d43c2 | 65 | struct net *net; |
1da177e4 LT |
66 | int (*func)(struct rt6_info *, void *arg); |
67 | void *arg; | |
68 | }; | |
69 | ||
90d41122 | 70 | static DEFINE_RWLOCK(fib6_walker_lock); |
1da177e4 LT |
71 | |
72 | #ifdef CONFIG_IPV6_SUBTREES | |
73 | #define FWS_INIT FWS_S | |
1da177e4 LT |
74 | #else |
75 | #define FWS_INIT FWS_L | |
1da177e4 LT |
76 | #endif |
77 | ||
ec7d43c2 BT |
78 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
79 | struct rt6_info *rt); | |
8ed67789 DL |
80 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn); |
81 | static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn); | |
90d41122 AB |
82 | static int fib6_walk(struct fib6_walker_t *w); |
83 | static int fib6_walk_continue(struct fib6_walker_t *w); | |
1da177e4 LT |
84 | |
85 | /* | |
86 | * A routing update causes an increase of the serial number on the | |
87 | * affected subtree. This allows for cached routes to be asynchronously | |
88 | * tested when modifications are made to the destination cache as a | |
89 | * result of redirects, path MTU changes, etc. | |
90 | */ | |
91 | ||
92 | static __u32 rt_sernum; | |
93 | ||
5b7c931d DL |
94 | static void fib6_gc_timer_cb(unsigned long arg); |
95 | ||
bbef49da AD |
96 | static LIST_HEAD(fib6_walkers); |
97 | #define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) | |
1da177e4 | 98 | |
90d41122 AB |
99 | static inline void fib6_walker_link(struct fib6_walker_t *w) |
100 | { | |
101 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 102 | list_add(&w->lh, &fib6_walkers); |
90d41122 AB |
103 | write_unlock_bh(&fib6_walker_lock); |
104 | } | |
105 | ||
106 | static inline void fib6_walker_unlink(struct fib6_walker_t *w) | |
107 | { | |
108 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 109 | list_del(&w->lh); |
90d41122 AB |
110 | write_unlock_bh(&fib6_walker_lock); |
111 | } | |
1da177e4 LT |
112 | static __inline__ u32 fib6_new_sernum(void) |
113 | { | |
114 | u32 n = ++rt_sernum; | |
115 | if ((__s32)n <= 0) | |
116 | rt_sernum = n = 1; | |
117 | return n; | |
118 | } | |
119 | ||
120 | /* | |
121 | * Auxiliary address test functions for the radix tree. | |
122 | * | |
1ab1457c | 123 | * These assume a 32bit processor (although it will work on |
1da177e4 LT |
124 | * 64bit processors) |
125 | */ | |
126 | ||
127 | /* | |
128 | * test bit | |
129 | */ | |
02cdce53 YH |
130 | #if defined(__LITTLE_ENDIAN) |
131 | # define BITOP_BE32_SWIZZLE (0x1F & ~7) | |
132 | #else | |
133 | # define BITOP_BE32_SWIZZLE 0 | |
134 | #endif | |
1da177e4 | 135 | |
b71d1d42 | 136 | static __inline__ __be32 addr_bit_set(const void *token, int fn_bit) |
1da177e4 | 137 | { |
b71d1d42 | 138 | const __be32 *addr = token; |
02cdce53 YH |
139 | /* |
140 | * Here, | |
141 | * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) | |
142 | * is optimized version of | |
143 | * htonl(1 << ((~fn_bit)&0x1F)) | |
144 | * See include/asm-generic/bitops/le.h. | |
145 | */ | |
0eae88f3 ED |
146 | return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & |
147 | addr[fn_bit >> 5]; | |
1da177e4 LT |
148 | } |
149 | ||
1da177e4 LT |
150 | static __inline__ struct fib6_node * node_alloc(void) |
151 | { | |
152 | struct fib6_node *fn; | |
153 | ||
c3762229 | 154 | fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
1da177e4 LT |
155 | |
156 | return fn; | |
157 | } | |
158 | ||
159 | static __inline__ void node_free(struct fib6_node * fn) | |
160 | { | |
161 | kmem_cache_free(fib6_node_kmem, fn); | |
162 | } | |
163 | ||
164 | static __inline__ void rt6_release(struct rt6_info *rt) | |
165 | { | |
166 | if (atomic_dec_and_test(&rt->rt6i_ref)) | |
d8d1f30b | 167 | dst_free(&rt->dst); |
1da177e4 LT |
168 | } |
169 | ||
58f09b78 | 170 | static void fib6_link_table(struct net *net, struct fib6_table *tb) |
1b43af54 PM |
171 | { |
172 | unsigned int h; | |
173 | ||
375216ad TG |
174 | /* |
175 | * Initialize table lock at a single place to give lockdep a key, | |
176 | * tables aren't visible prior to being linked to the list. | |
177 | */ | |
178 | rwlock_init(&tb->tb6_lock); | |
179 | ||
a33bc5c1 | 180 | h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
1b43af54 PM |
181 | |
182 | /* | |
183 | * No protection necessary, this is the only list mutatation | |
184 | * operation, tables never disappear once they exist. | |
185 | */ | |
58f09b78 | 186 | hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
1b43af54 | 187 | } |
c71099ac | 188 | |
1b43af54 | 189 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 190 | |
8ed67789 | 191 | static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
c71099ac TG |
192 | { |
193 | struct fib6_table *table; | |
194 | ||
195 | table = kzalloc(sizeof(*table), GFP_ATOMIC); | |
507c9b1e | 196 | if (table) { |
c71099ac | 197 | table->tb6_id = id; |
8ed67789 | 198 | table->tb6_root.leaf = net->ipv6.ip6_null_entry; |
c71099ac | 199 | table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
8e773277 | 200 | inet_peer_base_init(&table->tb6_peers); |
c71099ac TG |
201 | } |
202 | ||
203 | return table; | |
204 | } | |
205 | ||
58f09b78 | 206 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac TG |
207 | { |
208 | struct fib6_table *tb; | |
209 | ||
210 | if (id == 0) | |
211 | id = RT6_TABLE_MAIN; | |
58f09b78 | 212 | tb = fib6_get_table(net, id); |
c71099ac TG |
213 | if (tb) |
214 | return tb; | |
215 | ||
8ed67789 | 216 | tb = fib6_alloc_table(net, id); |
507c9b1e | 217 | if (tb) |
58f09b78 | 218 | fib6_link_table(net, tb); |
c71099ac TG |
219 | |
220 | return tb; | |
221 | } | |
222 | ||
58f09b78 | 223 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac TG |
224 | { |
225 | struct fib6_table *tb; | |
58f09b78 | 226 | struct hlist_head *head; |
c71099ac TG |
227 | unsigned int h; |
228 | ||
229 | if (id == 0) | |
230 | id = RT6_TABLE_MAIN; | |
a33bc5c1 | 231 | h = id & (FIB6_TABLE_HASHSZ - 1); |
c71099ac | 232 | rcu_read_lock(); |
58f09b78 | 233 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 234 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
c71099ac TG |
235 | if (tb->tb6_id == id) { |
236 | rcu_read_unlock(); | |
237 | return tb; | |
238 | } | |
239 | } | |
240 | rcu_read_unlock(); | |
241 | ||
242 | return NULL; | |
243 | } | |
244 | ||
2c8c1e72 | 245 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 246 | { |
58f09b78 DL |
247 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
248 | fib6_link_table(net, net->ipv6.fib6_local_tbl); | |
c71099ac | 249 | } |
c71099ac TG |
250 | #else |
251 | ||
58f09b78 | 252 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac | 253 | { |
58f09b78 | 254 | return fib6_get_table(net, id); |
c71099ac TG |
255 | } |
256 | ||
58f09b78 | 257 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac | 258 | { |
58f09b78 | 259 | return net->ipv6.fib6_main_tbl; |
c71099ac TG |
260 | } |
261 | ||
4c9483b2 | 262 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
58f09b78 | 263 | int flags, pol_lookup_t lookup) |
c71099ac | 264 | { |
4c9483b2 | 265 | return (struct dst_entry *) lookup(net, net->ipv6.fib6_main_tbl, fl6, flags); |
c71099ac TG |
266 | } |
267 | ||
2c8c1e72 | 268 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 269 | { |
58f09b78 | 270 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
c71099ac TG |
271 | } |
272 | ||
273 | #endif | |
274 | ||
1b43af54 PM |
275 | static int fib6_dump_node(struct fib6_walker_t *w) |
276 | { | |
277 | int res; | |
278 | struct rt6_info *rt; | |
279 | ||
d8d1f30b | 280 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1b43af54 PM |
281 | res = rt6_dump_route(rt, w->args); |
282 | if (res < 0) { | |
283 | /* Frame is full, suspend walking */ | |
284 | w->leaf = rt; | |
285 | return 1; | |
286 | } | |
547b792c | 287 | WARN_ON(res == 0); |
1b43af54 PM |
288 | } |
289 | w->leaf = NULL; | |
290 | return 0; | |
291 | } | |
292 | ||
293 | static void fib6_dump_end(struct netlink_callback *cb) | |
294 | { | |
295 | struct fib6_walker_t *w = (void*)cb->args[2]; | |
296 | ||
297 | if (w) { | |
7891cc81 HX |
298 | if (cb->args[4]) { |
299 | cb->args[4] = 0; | |
300 | fib6_walker_unlink(w); | |
301 | } | |
1b43af54 PM |
302 | cb->args[2] = 0; |
303 | kfree(w); | |
304 | } | |
305 | cb->done = (void*)cb->args[3]; | |
306 | cb->args[1] = 3; | |
307 | } | |
308 | ||
309 | static int fib6_dump_done(struct netlink_callback *cb) | |
310 | { | |
311 | fib6_dump_end(cb); | |
312 | return cb->done ? cb->done(cb) : 0; | |
313 | } | |
314 | ||
315 | static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, | |
316 | struct netlink_callback *cb) | |
317 | { | |
318 | struct fib6_walker_t *w; | |
319 | int res; | |
320 | ||
321 | w = (void *)cb->args[2]; | |
322 | w->root = &table->tb6_root; | |
323 | ||
324 | if (cb->args[4] == 0) { | |
2bec5a36 PM |
325 | w->count = 0; |
326 | w->skip = 0; | |
327 | ||
1b43af54 PM |
328 | read_lock_bh(&table->tb6_lock); |
329 | res = fib6_walk(w); | |
330 | read_unlock_bh(&table->tb6_lock); | |
2bec5a36 | 331 | if (res > 0) { |
1b43af54 | 332 | cb->args[4] = 1; |
2bec5a36 PM |
333 | cb->args[5] = w->root->fn_sernum; |
334 | } | |
1b43af54 | 335 | } else { |
2bec5a36 PM |
336 | if (cb->args[5] != w->root->fn_sernum) { |
337 | /* Begin at the root if the tree changed */ | |
338 | cb->args[5] = w->root->fn_sernum; | |
339 | w->state = FWS_INIT; | |
340 | w->node = w->root; | |
341 | w->skip = w->count; | |
342 | } else | |
343 | w->skip = 0; | |
344 | ||
1b43af54 PM |
345 | read_lock_bh(&table->tb6_lock); |
346 | res = fib6_walk_continue(w); | |
347 | read_unlock_bh(&table->tb6_lock); | |
7891cc81 HX |
348 | if (res <= 0) { |
349 | fib6_walker_unlink(w); | |
350 | cb->args[4] = 0; | |
1b43af54 | 351 | } |
1b43af54 | 352 | } |
7891cc81 | 353 | |
1b43af54 PM |
354 | return res; |
355 | } | |
356 | ||
c127ea2c | 357 | static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1b43af54 | 358 | { |
3b1e0a65 | 359 | struct net *net = sock_net(skb->sk); |
1b43af54 PM |
360 | unsigned int h, s_h; |
361 | unsigned int e = 0, s_e; | |
362 | struct rt6_rtnl_dump_arg arg; | |
363 | struct fib6_walker_t *w; | |
364 | struct fib6_table *tb; | |
58f09b78 | 365 | struct hlist_head *head; |
1b43af54 PM |
366 | int res = 0; |
367 | ||
368 | s_h = cb->args[0]; | |
369 | s_e = cb->args[1]; | |
370 | ||
371 | w = (void *)cb->args[2]; | |
507c9b1e | 372 | if (!w) { |
1b43af54 PM |
373 | /* New dump: |
374 | * | |
375 | * 1. hook callback destructor. | |
376 | */ | |
377 | cb->args[3] = (long)cb->done; | |
378 | cb->done = fib6_dump_done; | |
379 | ||
380 | /* | |
381 | * 2. allocate and initialize walker. | |
382 | */ | |
383 | w = kzalloc(sizeof(*w), GFP_ATOMIC); | |
507c9b1e | 384 | if (!w) |
1b43af54 PM |
385 | return -ENOMEM; |
386 | w->func = fib6_dump_node; | |
387 | cb->args[2] = (long)w; | |
388 | } | |
389 | ||
390 | arg.skb = skb; | |
391 | arg.cb = cb; | |
191cd582 | 392 | arg.net = net; |
1b43af54 PM |
393 | w->args = &arg; |
394 | ||
e67f88dd | 395 | rcu_read_lock(); |
a33bc5c1 | 396 | for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
1b43af54 | 397 | e = 0; |
58f09b78 | 398 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 399 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
1b43af54 PM |
400 | if (e < s_e) |
401 | goto next; | |
402 | res = fib6_dump_table(tb, skb, cb); | |
403 | if (res != 0) | |
404 | goto out; | |
405 | next: | |
406 | e++; | |
407 | } | |
408 | } | |
409 | out: | |
e67f88dd | 410 | rcu_read_unlock(); |
1b43af54 PM |
411 | cb->args[1] = e; |
412 | cb->args[0] = h; | |
413 | ||
414 | res = res < 0 ? res : skb->len; | |
415 | if (res <= 0) | |
416 | fib6_dump_end(cb); | |
417 | return res; | |
418 | } | |
1da177e4 LT |
419 | |
420 | /* | |
421 | * Routing Table | |
422 | * | |
423 | * return the appropriate node for a routing tree "add" operation | |
424 | * by either creating and inserting or by returning an existing | |
425 | * node. | |
426 | */ | |
427 | ||
9225b230 | 428 | static struct fib6_node *fib6_add_1(struct fib6_node *root, |
429 | struct in6_addr *addr, int plen, | |
4a287eba MV |
430 | int offset, int allow_create, |
431 | int replace_required) | |
1da177e4 LT |
432 | { |
433 | struct fib6_node *fn, *in, *ln; | |
434 | struct fib6_node *pn = NULL; | |
435 | struct rt6key *key; | |
436 | int bit; | |
1ab1457c | 437 | __be32 dir = 0; |
1da177e4 LT |
438 | __u32 sernum = fib6_new_sernum(); |
439 | ||
440 | RT6_TRACE("fib6_add_1\n"); | |
441 | ||
442 | /* insert node in tree */ | |
443 | ||
444 | fn = root; | |
445 | ||
446 | do { | |
447 | key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
448 | ||
449 | /* | |
450 | * Prefix match | |
451 | */ | |
452 | if (plen < fn->fn_bit || | |
4a287eba | 453 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { |
14df015b MV |
454 | if (!allow_create) { |
455 | if (replace_required) { | |
f3213831 | 456 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
457 | return ERR_PTR(-ENOENT); |
458 | } | |
f3213831 | 459 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
14df015b | 460 | } |
1da177e4 | 461 | goto insert_above; |
4a287eba | 462 | } |
1ab1457c | 463 | |
1da177e4 LT |
464 | /* |
465 | * Exact match ? | |
466 | */ | |
1ab1457c | 467 | |
1da177e4 LT |
468 | if (plen == fn->fn_bit) { |
469 | /* clean up an intermediate node */ | |
507c9b1e | 470 | if (!(fn->fn_flags & RTN_RTINFO)) { |
1da177e4 LT |
471 | rt6_release(fn->leaf); |
472 | fn->leaf = NULL; | |
473 | } | |
1ab1457c | 474 | |
1da177e4 | 475 | fn->fn_sernum = sernum; |
1ab1457c | 476 | |
1da177e4 LT |
477 | return fn; |
478 | } | |
479 | ||
480 | /* | |
481 | * We have more bits to go | |
482 | */ | |
1ab1457c | 483 | |
1da177e4 LT |
484 | /* Try to walk down on tree. */ |
485 | fn->fn_sernum = sernum; | |
486 | dir = addr_bit_set(addr, fn->fn_bit); | |
487 | pn = fn; | |
488 | fn = dir ? fn->right: fn->left; | |
489 | } while (fn); | |
490 | ||
14df015b | 491 | if (!allow_create) { |
4a287eba MV |
492 | /* We should not create new node because |
493 | * NLM_F_REPLACE was specified without NLM_F_CREATE | |
494 | * I assume it is safe to require NLM_F_CREATE when | |
495 | * REPLACE flag is used! Later we may want to remove the | |
496 | * check for replace_required, because according | |
497 | * to netlink specification, NLM_F_CREATE | |
498 | * MUST be specified if new route is created. | |
499 | * That would keep IPv6 consistent with IPv4 | |
500 | */ | |
14df015b | 501 | if (replace_required) { |
f3213831 | 502 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
503 | return ERR_PTR(-ENOENT); |
504 | } | |
f3213831 | 505 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba | 506 | } |
1da177e4 LT |
507 | /* |
508 | * We walked to the bottom of tree. | |
509 | * Create new leaf node without children. | |
510 | */ | |
511 | ||
512 | ln = node_alloc(); | |
513 | ||
507c9b1e | 514 | if (!ln) |
188c517a | 515 | return ERR_PTR(-ENOMEM); |
1da177e4 | 516 | ln->fn_bit = plen; |
1ab1457c | 517 | |
1da177e4 LT |
518 | ln->parent = pn; |
519 | ln->fn_sernum = sernum; | |
520 | ||
521 | if (dir) | |
522 | pn->right = ln; | |
523 | else | |
524 | pn->left = ln; | |
525 | ||
526 | return ln; | |
527 | ||
528 | ||
529 | insert_above: | |
530 | /* | |
1ab1457c | 531 | * split since we don't have a common prefix anymore or |
1da177e4 LT |
532 | * we have a less significant route. |
533 | * we've to insert an intermediate node on the list | |
534 | * this new node will point to the one we need to create | |
535 | * and the current | |
536 | */ | |
537 | ||
538 | pn = fn->parent; | |
539 | ||
540 | /* find 1st bit in difference between the 2 addrs. | |
541 | ||
971f359d | 542 | See comment in __ipv6_addr_diff: bit may be an invalid value, |
1da177e4 LT |
543 | but if it is >= plen, the value is ignored in any case. |
544 | */ | |
1ab1457c | 545 | |
9225b230 | 546 | bit = __ipv6_addr_diff(addr, &key->addr, sizeof(*addr)); |
1da177e4 | 547 | |
1ab1457c YH |
548 | /* |
549 | * (intermediate)[in] | |
1da177e4 LT |
550 | * / \ |
551 | * (new leaf node)[ln] (old node)[fn] | |
552 | */ | |
553 | if (plen > bit) { | |
554 | in = node_alloc(); | |
555 | ln = node_alloc(); | |
1ab1457c | 556 | |
507c9b1e | 557 | if (!in || !ln) { |
1da177e4 LT |
558 | if (in) |
559 | node_free(in); | |
560 | if (ln) | |
561 | node_free(ln); | |
188c517a | 562 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
563 | } |
564 | ||
1ab1457c YH |
565 | /* |
566 | * new intermediate node. | |
1da177e4 LT |
567 | * RTN_RTINFO will |
568 | * be off since that an address that chooses one of | |
569 | * the branches would not match less specific routes | |
570 | * in the other branch | |
571 | */ | |
572 | ||
573 | in->fn_bit = bit; | |
574 | ||
575 | in->parent = pn; | |
576 | in->leaf = fn->leaf; | |
577 | atomic_inc(&in->leaf->rt6i_ref); | |
578 | ||
579 | in->fn_sernum = sernum; | |
580 | ||
581 | /* update parent pointer */ | |
582 | if (dir) | |
583 | pn->right = in; | |
584 | else | |
585 | pn->left = in; | |
586 | ||
587 | ln->fn_bit = plen; | |
588 | ||
589 | ln->parent = in; | |
590 | fn->parent = in; | |
591 | ||
592 | ln->fn_sernum = sernum; | |
593 | ||
594 | if (addr_bit_set(addr, bit)) { | |
595 | in->right = ln; | |
596 | in->left = fn; | |
597 | } else { | |
598 | in->left = ln; | |
599 | in->right = fn; | |
600 | } | |
601 | } else { /* plen <= bit */ | |
602 | ||
1ab1457c | 603 | /* |
1da177e4 LT |
604 | * (new leaf node)[ln] |
605 | * / \ | |
606 | * (old node)[fn] NULL | |
607 | */ | |
608 | ||
609 | ln = node_alloc(); | |
610 | ||
507c9b1e | 611 | if (!ln) |
188c517a | 612 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
613 | |
614 | ln->fn_bit = plen; | |
615 | ||
616 | ln->parent = pn; | |
617 | ||
618 | ln->fn_sernum = sernum; | |
1ab1457c | 619 | |
1da177e4 LT |
620 | if (dir) |
621 | pn->right = ln; | |
622 | else | |
623 | pn->left = ln; | |
624 | ||
625 | if (addr_bit_set(&key->addr, plen)) | |
626 | ln->right = fn; | |
627 | else | |
628 | ln->left = fn; | |
629 | ||
630 | fn->parent = ln; | |
631 | } | |
632 | return ln; | |
633 | } | |
634 | ||
307f2fb9 HFS |
635 | static inline bool rt6_qualify_for_ecmp(struct rt6_info *rt) |
636 | { | |
637 | return (rt->rt6i_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) == | |
638 | RTF_GATEWAY; | |
639 | } | |
640 | ||
e5fd387a MK |
641 | static int fib6_commit_metrics(struct dst_entry *dst, |
642 | struct nlattr *mx, int mx_len) | |
643 | { | |
644 | struct nlattr *nla; | |
645 | int remaining; | |
646 | u32 *mp; | |
647 | ||
648 | if (dst->flags & DST_HOST) { | |
649 | mp = dst_metrics_write_ptr(dst); | |
650 | } else { | |
651 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
652 | if (!mp) | |
653 | return -ENOMEM; | |
654 | dst_init_metrics(dst, mp, 0); | |
655 | } | |
656 | ||
657 | nla_for_each_attr(nla, mx, mx_len, remaining) { | |
658 | int type = nla_type(nla); | |
659 | ||
660 | if (type) { | |
661 | if (type > RTAX_MAX) | |
662 | return -EINVAL; | |
663 | ||
664 | mp[type - 1] = nla_get_u32(nla); | |
665 | } | |
666 | } | |
667 | return 0; | |
668 | } | |
669 | ||
1da177e4 LT |
670 | /* |
671 | * Insert routing information in a node. | |
672 | */ | |
673 | ||
674 | static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt, | |
e5fd387a | 675 | struct nl_info *info, struct nlattr *mx, int mx_len) |
1da177e4 LT |
676 | { |
677 | struct rt6_info *iter = NULL; | |
678 | struct rt6_info **ins; | |
507c9b1e DM |
679 | int replace = (info->nlh && |
680 | (info->nlh->nlmsg_flags & NLM_F_REPLACE)); | |
681 | int add = (!info->nlh || | |
682 | (info->nlh->nlmsg_flags & NLM_F_CREATE)); | |
4a287eba | 683 | int found = 0; |
307f2fb9 | 684 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); |
e5fd387a | 685 | int err; |
1da177e4 LT |
686 | |
687 | ins = &fn->leaf; | |
688 | ||
507c9b1e | 689 | for (iter = fn->leaf; iter; iter = iter->dst.rt6_next) { |
1da177e4 LT |
690 | /* |
691 | * Search for duplicates | |
692 | */ | |
693 | ||
694 | if (iter->rt6i_metric == rt->rt6i_metric) { | |
695 | /* | |
696 | * Same priority level | |
697 | */ | |
507c9b1e DM |
698 | if (info->nlh && |
699 | (info->nlh->nlmsg_flags & NLM_F_EXCL)) | |
4a287eba MV |
700 | return -EEXIST; |
701 | if (replace) { | |
702 | found++; | |
703 | break; | |
704 | } | |
1da177e4 | 705 | |
d1918542 | 706 | if (iter->dst.dev == rt->dst.dev && |
1da177e4 LT |
707 | iter->rt6i_idev == rt->rt6i_idev && |
708 | ipv6_addr_equal(&iter->rt6i_gateway, | |
709 | &rt->rt6i_gateway)) { | |
51ebd318 ND |
710 | if (rt->rt6i_nsiblings) |
711 | rt->rt6i_nsiblings = 0; | |
507c9b1e | 712 | if (!(iter->rt6i_flags & RTF_EXPIRES)) |
1da177e4 | 713 | return -EEXIST; |
1716a961 G |
714 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
715 | rt6_clean_expires(iter); | |
716 | else | |
717 | rt6_set_expires(iter, rt->dst.expires); | |
1da177e4 LT |
718 | return -EEXIST; |
719 | } | |
51ebd318 ND |
720 | /* If we have the same destination and the same metric, |
721 | * but not the same gateway, then the route we try to | |
722 | * add is sibling to this route, increment our counter | |
723 | * of siblings, and later we will add our route to the | |
724 | * list. | |
725 | * Only static routes (which don't have flag | |
726 | * RTF_EXPIRES) are used for ECMPv6. | |
727 | * | |
728 | * To avoid long list, we only had siblings if the | |
729 | * route have a gateway. | |
730 | */ | |
307f2fb9 HFS |
731 | if (rt_can_ecmp && |
732 | rt6_qualify_for_ecmp(iter)) | |
51ebd318 | 733 | rt->rt6i_nsiblings++; |
1da177e4 LT |
734 | } |
735 | ||
736 | if (iter->rt6i_metric > rt->rt6i_metric) | |
737 | break; | |
738 | ||
d8d1f30b | 739 | ins = &iter->dst.rt6_next; |
1da177e4 LT |
740 | } |
741 | ||
f11e6659 DM |
742 | /* Reset round-robin state, if necessary */ |
743 | if (ins == &fn->leaf) | |
744 | fn->rr_ptr = NULL; | |
745 | ||
51ebd318 ND |
746 | /* Link this route to others same route. */ |
747 | if (rt->rt6i_nsiblings) { | |
748 | unsigned int rt6i_nsiblings; | |
749 | struct rt6_info *sibling, *temp_sibling; | |
750 | ||
751 | /* Find the first route that have the same metric */ | |
752 | sibling = fn->leaf; | |
753 | while (sibling) { | |
307f2fb9 HFS |
754 | if (sibling->rt6i_metric == rt->rt6i_metric && |
755 | rt6_qualify_for_ecmp(sibling)) { | |
51ebd318 ND |
756 | list_add_tail(&rt->rt6i_siblings, |
757 | &sibling->rt6i_siblings); | |
758 | break; | |
759 | } | |
760 | sibling = sibling->dst.rt6_next; | |
761 | } | |
762 | /* For each sibling in the list, increment the counter of | |
763 | * siblings. BUG() if counters does not match, list of siblings | |
764 | * is broken! | |
765 | */ | |
766 | rt6i_nsiblings = 0; | |
767 | list_for_each_entry_safe(sibling, temp_sibling, | |
768 | &rt->rt6i_siblings, rt6i_siblings) { | |
769 | sibling->rt6i_nsiblings++; | |
770 | BUG_ON(sibling->rt6i_nsiblings != rt->rt6i_nsiblings); | |
771 | rt6i_nsiblings++; | |
772 | } | |
773 | BUG_ON(rt6i_nsiblings != rt->rt6i_nsiblings); | |
774 | } | |
775 | ||
1da177e4 LT |
776 | /* |
777 | * insert node | |
778 | */ | |
4a287eba MV |
779 | if (!replace) { |
780 | if (!add) | |
f3213831 | 781 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba MV |
782 | |
783 | add: | |
e5fd387a MK |
784 | if (mx) { |
785 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
786 | if (err) | |
787 | return err; | |
788 | } | |
4a287eba MV |
789 | rt->dst.rt6_next = iter; |
790 | *ins = rt; | |
791 | rt->rt6i_node = fn; | |
792 | atomic_inc(&rt->rt6i_ref); | |
793 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
794 | info->nl_net->ipv6.rt6_stats->fib_rt_entries++; | |
795 | ||
507c9b1e | 796 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
797 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
798 | fn->fn_flags |= RTN_RTINFO; | |
799 | } | |
1da177e4 | 800 | |
4a287eba MV |
801 | } else { |
802 | if (!found) { | |
803 | if (add) | |
804 | goto add; | |
f3213831 | 805 | pr_warn("NLM_F_REPLACE set, but no existing node found!\n"); |
4a287eba MV |
806 | return -ENOENT; |
807 | } | |
e5fd387a MK |
808 | if (mx) { |
809 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
810 | if (err) | |
811 | return err; | |
812 | } | |
4a287eba MV |
813 | *ins = rt; |
814 | rt->rt6i_node = fn; | |
815 | rt->dst.rt6_next = iter->dst.rt6_next; | |
816 | atomic_inc(&rt->rt6i_ref); | |
817 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
818 | rt6_release(iter); | |
507c9b1e | 819 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
820 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
821 | fn->fn_flags |= RTN_RTINFO; | |
822 | } | |
1da177e4 LT |
823 | } |
824 | ||
825 | return 0; | |
826 | } | |
827 | ||
63152fc0 | 828 | static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt) |
1da177e4 | 829 | { |
417f28bb | 830 | if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
507c9b1e | 831 | (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE))) |
417f28bb | 832 | mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce | 833 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
834 | } |
835 | ||
63152fc0 | 836 | void fib6_force_start_gc(struct net *net) |
1da177e4 | 837 | { |
417f28bb SH |
838 | if (!timer_pending(&net->ipv6.ip6_fib_timer)) |
839 | mod_timer(&net->ipv6.ip6_fib_timer, | |
847499ce | 840 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
841 | } |
842 | ||
843 | /* | |
844 | * Add routing information to the routing tree. | |
845 | * <destination addr>/<source addr> | |
846 | * with source addr info in sub-trees | |
847 | */ | |
848 | ||
e5fd387a MK |
849 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info, |
850 | struct nlattr *mx, int mx_len) | |
1da177e4 | 851 | { |
66729e18 | 852 | struct fib6_node *fn, *pn = NULL; |
1da177e4 | 853 | int err = -ENOMEM; |
4a287eba MV |
854 | int allow_create = 1; |
855 | int replace_required = 0; | |
507c9b1e DM |
856 | |
857 | if (info->nlh) { | |
858 | if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) | |
4a287eba | 859 | allow_create = 0; |
507c9b1e | 860 | if (info->nlh->nlmsg_flags & NLM_F_REPLACE) |
4a287eba MV |
861 | replace_required = 1; |
862 | } | |
863 | if (!allow_create && !replace_required) | |
f3213831 | 864 | pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n"); |
1da177e4 | 865 | |
9225b230 | 866 | fn = fib6_add_1(root, &rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
867 | offsetof(struct rt6_info, rt6i_dst), allow_create, | |
868 | replace_required); | |
4a287eba MV |
869 | if (IS_ERR(fn)) { |
870 | err = PTR_ERR(fn); | |
ae7b4e1f | 871 | fn = NULL; |
1da177e4 | 872 | goto out; |
188c517a | 873 | } |
1da177e4 | 874 | |
66729e18 YH |
875 | pn = fn; |
876 | ||
1da177e4 LT |
877 | #ifdef CONFIG_IPV6_SUBTREES |
878 | if (rt->rt6i_src.plen) { | |
879 | struct fib6_node *sn; | |
880 | ||
507c9b1e | 881 | if (!fn->subtree) { |
1da177e4 LT |
882 | struct fib6_node *sfn; |
883 | ||
884 | /* | |
885 | * Create subtree. | |
886 | * | |
887 | * fn[main tree] | |
888 | * | | |
889 | * sfn[subtree root] | |
890 | * \ | |
891 | * sn[new leaf node] | |
892 | */ | |
893 | ||
894 | /* Create subtree root node */ | |
895 | sfn = node_alloc(); | |
507c9b1e | 896 | if (!sfn) |
1da177e4 LT |
897 | goto st_failure; |
898 | ||
8ed67789 DL |
899 | sfn->leaf = info->nl_net->ipv6.ip6_null_entry; |
900 | atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref); | |
1da177e4 LT |
901 | sfn->fn_flags = RTN_ROOT; |
902 | sfn->fn_sernum = fib6_new_sernum(); | |
903 | ||
904 | /* Now add the first leaf node to new subtree */ | |
905 | ||
906 | sn = fib6_add_1(sfn, &rt->rt6i_src.addr, | |
9225b230 | 907 | rt->rt6i_src.plen, |
4a287eba MV |
908 | offsetof(struct rt6_info, rt6i_src), |
909 | allow_create, replace_required); | |
1da177e4 | 910 | |
f950c0ec | 911 | if (IS_ERR(sn)) { |
1da177e4 LT |
912 | /* If it is failed, discard just allocated |
913 | root, and then (in st_failure) stale node | |
914 | in main tree. | |
915 | */ | |
916 | node_free(sfn); | |
188c517a | 917 | err = PTR_ERR(sn); |
1da177e4 LT |
918 | goto st_failure; |
919 | } | |
920 | ||
921 | /* Now link new subtree to main tree */ | |
922 | sfn->parent = fn; | |
923 | fn->subtree = sfn; | |
1da177e4 LT |
924 | } else { |
925 | sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr, | |
9225b230 | 926 | rt->rt6i_src.plen, |
4a287eba MV |
927 | offsetof(struct rt6_info, rt6i_src), |
928 | allow_create, replace_required); | |
1da177e4 | 929 | |
4a287eba MV |
930 | if (IS_ERR(sn)) { |
931 | err = PTR_ERR(sn); | |
1da177e4 | 932 | goto st_failure; |
188c517a | 933 | } |
1da177e4 LT |
934 | } |
935 | ||
507c9b1e | 936 | if (!fn->leaf) { |
66729e18 YH |
937 | fn->leaf = rt; |
938 | atomic_inc(&rt->rt6i_ref); | |
939 | } | |
1da177e4 LT |
940 | fn = sn; |
941 | } | |
942 | #endif | |
943 | ||
e5fd387a | 944 | err = fib6_add_rt2node(fn, rt, info, mx, mx_len); |
507c9b1e | 945 | if (!err) { |
63152fc0 | 946 | fib6_start_gc(info->nl_net, rt); |
507c9b1e | 947 | if (!(rt->rt6i_flags & RTF_CACHE)) |
ec7d43c2 | 948 | fib6_prune_clones(info->nl_net, pn, rt); |
1da177e4 LT |
949 | } |
950 | ||
951 | out: | |
66729e18 YH |
952 | if (err) { |
953 | #ifdef CONFIG_IPV6_SUBTREES | |
954 | /* | |
955 | * If fib6_add_1 has cleared the old leaf pointer in the | |
956 | * super-tree leaf node we have to find a new one for it. | |
957 | */ | |
3c051235 DM |
958 | if (pn != fn && pn->leaf == rt) { |
959 | pn->leaf = NULL; | |
960 | atomic_dec(&rt->rt6i_ref); | |
961 | } | |
66729e18 | 962 | if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) { |
8ed67789 | 963 | pn->leaf = fib6_find_prefix(info->nl_net, pn); |
66729e18 YH |
964 | #if RT6_DEBUG >= 2 |
965 | if (!pn->leaf) { | |
547b792c | 966 | WARN_ON(pn->leaf == NULL); |
8ed67789 | 967 | pn->leaf = info->nl_net->ipv6.ip6_null_entry; |
66729e18 YH |
968 | } |
969 | #endif | |
970 | atomic_inc(&pn->leaf->rt6i_ref); | |
971 | } | |
972 | #endif | |
d8d1f30b | 973 | dst_free(&rt->dst); |
66729e18 | 974 | } |
1da177e4 LT |
975 | return err; |
976 | ||
977 | #ifdef CONFIG_IPV6_SUBTREES | |
978 | /* Subtree creation failed, probably main tree node | |
979 | is orphan. If it is, shoot it. | |
980 | */ | |
981 | st_failure: | |
982 | if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT))) | |
8ed67789 | 983 | fib6_repair_tree(info->nl_net, fn); |
d8d1f30b | 984 | dst_free(&rt->dst); |
1da177e4 LT |
985 | return err; |
986 | #endif | |
987 | } | |
988 | ||
989 | /* | |
990 | * Routing tree lookup | |
991 | * | |
992 | */ | |
993 | ||
994 | struct lookup_args { | |
507c9b1e | 995 | int offset; /* key offset on rt6_info */ |
b71d1d42 | 996 | const struct in6_addr *addr; /* search key */ |
1da177e4 LT |
997 | }; |
998 | ||
999 | static struct fib6_node * fib6_lookup_1(struct fib6_node *root, | |
1000 | struct lookup_args *args) | |
1001 | { | |
1002 | struct fib6_node *fn; | |
e69a4adc | 1003 | __be32 dir; |
1da177e4 | 1004 | |
825e288e YH |
1005 | if (unlikely(args->offset == 0)) |
1006 | return NULL; | |
1007 | ||
1da177e4 LT |
1008 | /* |
1009 | * Descend on a tree | |
1010 | */ | |
1011 | ||
1012 | fn = root; | |
1013 | ||
1014 | for (;;) { | |
1015 | struct fib6_node *next; | |
1016 | ||
1017 | dir = addr_bit_set(args->addr, fn->fn_bit); | |
1018 | ||
1019 | next = dir ? fn->right : fn->left; | |
1020 | ||
1021 | if (next) { | |
1022 | fn = next; | |
1023 | continue; | |
1024 | } | |
1da177e4 LT |
1025 | break; |
1026 | } | |
1027 | ||
507c9b1e | 1028 | while (fn) { |
7fc33165 | 1029 | if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) { |
1da177e4 LT |
1030 | struct rt6key *key; |
1031 | ||
1032 | key = (struct rt6key *) ((u8 *) fn->leaf + | |
1033 | args->offset); | |
1034 | ||
3fc5e044 YH |
1035 | if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { |
1036 | #ifdef CONFIG_IPV6_SUBTREES | |
3e3be275 HFS |
1037 | if (fn->subtree) { |
1038 | struct fib6_node *sfn; | |
1039 | sfn = fib6_lookup_1(fn->subtree, | |
1040 | args + 1); | |
1041 | if (!sfn) | |
1042 | goto backtrack; | |
1043 | fn = sfn; | |
1044 | } | |
3fc5e044 | 1045 | #endif |
3e3be275 | 1046 | if (fn->fn_flags & RTN_RTINFO) |
3fc5e044 YH |
1047 | return fn; |
1048 | } | |
1da177e4 | 1049 | } |
3e3be275 HFS |
1050 | #ifdef CONFIG_IPV6_SUBTREES |
1051 | backtrack: | |
1052 | #endif | |
3fc5e044 YH |
1053 | if (fn->fn_flags & RTN_ROOT) |
1054 | break; | |
1055 | ||
1da177e4 LT |
1056 | fn = fn->parent; |
1057 | } | |
1058 | ||
1059 | return NULL; | |
1060 | } | |
1061 | ||
b71d1d42 ED |
1062 | struct fib6_node * fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr, |
1063 | const struct in6_addr *saddr) | |
1da177e4 | 1064 | { |
1da177e4 | 1065 | struct fib6_node *fn; |
825e288e YH |
1066 | struct lookup_args args[] = { |
1067 | { | |
1068 | .offset = offsetof(struct rt6_info, rt6i_dst), | |
1069 | .addr = daddr, | |
1070 | }, | |
1da177e4 | 1071 | #ifdef CONFIG_IPV6_SUBTREES |
825e288e YH |
1072 | { |
1073 | .offset = offsetof(struct rt6_info, rt6i_src), | |
1074 | .addr = saddr, | |
1075 | }, | |
1da177e4 | 1076 | #endif |
825e288e YH |
1077 | { |
1078 | .offset = 0, /* sentinel */ | |
1079 | } | |
1080 | }; | |
1da177e4 | 1081 | |
fefc2a6c | 1082 | fn = fib6_lookup_1(root, daddr ? args : args + 1); |
507c9b1e | 1083 | if (!fn || fn->fn_flags & RTN_TL_ROOT) |
1da177e4 LT |
1084 | fn = root; |
1085 | ||
1086 | return fn; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * Get node with specified destination prefix (and source prefix, | |
1091 | * if subtrees are used) | |
1092 | */ | |
1093 | ||
1094 | ||
1095 | static struct fib6_node * fib6_locate_1(struct fib6_node *root, | |
b71d1d42 | 1096 | const struct in6_addr *addr, |
1da177e4 LT |
1097 | int plen, int offset) |
1098 | { | |
1099 | struct fib6_node *fn; | |
1100 | ||
1101 | for (fn = root; fn ; ) { | |
1102 | struct rt6key *key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
1103 | ||
1104 | /* | |
1105 | * Prefix match | |
1106 | */ | |
1107 | if (plen < fn->fn_bit || | |
1108 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) | |
1109 | return NULL; | |
1110 | ||
1111 | if (plen == fn->fn_bit) | |
1112 | return fn; | |
1113 | ||
1114 | /* | |
1115 | * We have more bits to go | |
1116 | */ | |
1117 | if (addr_bit_set(addr, fn->fn_bit)) | |
1118 | fn = fn->right; | |
1119 | else | |
1120 | fn = fn->left; | |
1121 | } | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | struct fib6_node * fib6_locate(struct fib6_node *root, | |
b71d1d42 ED |
1126 | const struct in6_addr *daddr, int dst_len, |
1127 | const struct in6_addr *saddr, int src_len) | |
1da177e4 LT |
1128 | { |
1129 | struct fib6_node *fn; | |
1130 | ||
1131 | fn = fib6_locate_1(root, daddr, dst_len, | |
1132 | offsetof(struct rt6_info, rt6i_dst)); | |
1133 | ||
1134 | #ifdef CONFIG_IPV6_SUBTREES | |
1135 | if (src_len) { | |
547b792c | 1136 | WARN_ON(saddr == NULL); |
3fc5e044 YH |
1137 | if (fn && fn->subtree) |
1138 | fn = fib6_locate_1(fn->subtree, saddr, src_len, | |
1da177e4 LT |
1139 | offsetof(struct rt6_info, rt6i_src)); |
1140 | } | |
1141 | #endif | |
1142 | ||
507c9b1e | 1143 | if (fn && fn->fn_flags & RTN_RTINFO) |
1da177e4 LT |
1144 | return fn; |
1145 | ||
1146 | return NULL; | |
1147 | } | |
1148 | ||
1149 | ||
1150 | /* | |
1151 | * Deletion | |
1152 | * | |
1153 | */ | |
1154 | ||
8ed67789 | 1155 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn) |
1da177e4 | 1156 | { |
507c9b1e | 1157 | if (fn->fn_flags & RTN_ROOT) |
8ed67789 | 1158 | return net->ipv6.ip6_null_entry; |
1da177e4 | 1159 | |
507c9b1e DM |
1160 | while (fn) { |
1161 | if (fn->left) | |
1da177e4 | 1162 | return fn->left->leaf; |
507c9b1e | 1163 | if (fn->right) |
1da177e4 LT |
1164 | return fn->right->leaf; |
1165 | ||
7fc33165 | 1166 | fn = FIB6_SUBTREE(fn); |
1da177e4 LT |
1167 | } |
1168 | return NULL; | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * Called to trim the tree of intermediate nodes when possible. "fn" | |
1173 | * is the node we want to try and remove. | |
1174 | */ | |
1175 | ||
8ed67789 DL |
1176 | static struct fib6_node *fib6_repair_tree(struct net *net, |
1177 | struct fib6_node *fn) | |
1da177e4 LT |
1178 | { |
1179 | int children; | |
1180 | int nstate; | |
1181 | struct fib6_node *child, *pn; | |
1182 | struct fib6_walker_t *w; | |
1183 | int iter = 0; | |
1184 | ||
1185 | for (;;) { | |
1186 | RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter); | |
1187 | iter++; | |
1188 | ||
547b792c IJ |
1189 | WARN_ON(fn->fn_flags & RTN_RTINFO); |
1190 | WARN_ON(fn->fn_flags & RTN_TL_ROOT); | |
1191 | WARN_ON(fn->leaf != NULL); | |
1da177e4 LT |
1192 | |
1193 | children = 0; | |
1194 | child = NULL; | |
1195 | if (fn->right) child = fn->right, children |= 1; | |
1196 | if (fn->left) child = fn->left, children |= 2; | |
1197 | ||
7fc33165 | 1198 | if (children == 3 || FIB6_SUBTREE(fn) |
1da177e4 LT |
1199 | #ifdef CONFIG_IPV6_SUBTREES |
1200 | /* Subtree root (i.e. fn) may have one child */ | |
507c9b1e | 1201 | || (children && fn->fn_flags & RTN_ROOT) |
1da177e4 LT |
1202 | #endif |
1203 | ) { | |
8ed67789 | 1204 | fn->leaf = fib6_find_prefix(net, fn); |
1da177e4 | 1205 | #if RT6_DEBUG >= 2 |
507c9b1e | 1206 | if (!fn->leaf) { |
547b792c | 1207 | WARN_ON(!fn->leaf); |
8ed67789 | 1208 | fn->leaf = net->ipv6.ip6_null_entry; |
1da177e4 LT |
1209 | } |
1210 | #endif | |
1211 | atomic_inc(&fn->leaf->rt6i_ref); | |
1212 | return fn->parent; | |
1213 | } | |
1214 | ||
1215 | pn = fn->parent; | |
1216 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1217 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1218 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
7fc33165 | 1219 | FIB6_SUBTREE(pn) = NULL; |
1da177e4 LT |
1220 | nstate = FWS_L; |
1221 | } else { | |
547b792c | 1222 | WARN_ON(fn->fn_flags & RTN_ROOT); |
1da177e4 LT |
1223 | #endif |
1224 | if (pn->right == fn) pn->right = child; | |
1225 | else if (pn->left == fn) pn->left = child; | |
1226 | #if RT6_DEBUG >= 2 | |
547b792c IJ |
1227 | else |
1228 | WARN_ON(1); | |
1da177e4 LT |
1229 | #endif |
1230 | if (child) | |
1231 | child->parent = pn; | |
1232 | nstate = FWS_R; | |
1233 | #ifdef CONFIG_IPV6_SUBTREES | |
1234 | } | |
1235 | #endif | |
1236 | ||
1237 | read_lock(&fib6_walker_lock); | |
1238 | FOR_WALKERS(w) { | |
507c9b1e | 1239 | if (!child) { |
1da177e4 LT |
1240 | if (w->root == fn) { |
1241 | w->root = w->node = NULL; | |
1242 | RT6_TRACE("W %p adjusted by delroot 1\n", w); | |
1243 | } else if (w->node == fn) { | |
1244 | RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate); | |
1245 | w->node = pn; | |
1246 | w->state = nstate; | |
1247 | } | |
1248 | } else { | |
1249 | if (w->root == fn) { | |
1250 | w->root = child; | |
1251 | RT6_TRACE("W %p adjusted by delroot 2\n", w); | |
1252 | } | |
1253 | if (w->node == fn) { | |
1254 | w->node = child; | |
1255 | if (children&2) { | |
1256 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
1257 | w->state = w->state>=FWS_R ? FWS_U : FWS_INIT; | |
1258 | } else { | |
1259 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
1260 | w->state = w->state>=FWS_C ? FWS_U : FWS_INIT; | |
1261 | } | |
1262 | } | |
1263 | } | |
1264 | } | |
1265 | read_unlock(&fib6_walker_lock); | |
1266 | ||
1267 | node_free(fn); | |
507c9b1e | 1268 | if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn)) |
1da177e4 LT |
1269 | return pn; |
1270 | ||
1271 | rt6_release(pn->leaf); | |
1272 | pn->leaf = NULL; | |
1273 | fn = pn; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, | |
86872cb5 | 1278 | struct nl_info *info) |
1da177e4 LT |
1279 | { |
1280 | struct fib6_walker_t *w; | |
1281 | struct rt6_info *rt = *rtp; | |
c572872f | 1282 | struct net *net = info->nl_net; |
1da177e4 LT |
1283 | |
1284 | RT6_TRACE("fib6_del_route\n"); | |
1285 | ||
1286 | /* Unlink it */ | |
d8d1f30b | 1287 | *rtp = rt->dst.rt6_next; |
1da177e4 | 1288 | rt->rt6i_node = NULL; |
c572872f BT |
1289 | net->ipv6.rt6_stats->fib_rt_entries--; |
1290 | net->ipv6.rt6_stats->fib_discarded_routes++; | |
1da177e4 | 1291 | |
f11e6659 DM |
1292 | /* Reset round-robin state, if necessary */ |
1293 | if (fn->rr_ptr == rt) | |
1294 | fn->rr_ptr = NULL; | |
1295 | ||
51ebd318 ND |
1296 | /* Remove this entry from other siblings */ |
1297 | if (rt->rt6i_nsiblings) { | |
1298 | struct rt6_info *sibling, *next_sibling; | |
1299 | ||
1300 | list_for_each_entry_safe(sibling, next_sibling, | |
1301 | &rt->rt6i_siblings, rt6i_siblings) | |
1302 | sibling->rt6i_nsiblings--; | |
1303 | rt->rt6i_nsiblings = 0; | |
1304 | list_del_init(&rt->rt6i_siblings); | |
1305 | } | |
1306 | ||
1da177e4 LT |
1307 | /* Adjust walkers */ |
1308 | read_lock(&fib6_walker_lock); | |
1309 | FOR_WALKERS(w) { | |
1310 | if (w->state == FWS_C && w->leaf == rt) { | |
1311 | RT6_TRACE("walker %p adjusted by delroute\n", w); | |
d8d1f30b | 1312 | w->leaf = rt->dst.rt6_next; |
507c9b1e | 1313 | if (!w->leaf) |
1da177e4 LT |
1314 | w->state = FWS_U; |
1315 | } | |
1316 | } | |
1317 | read_unlock(&fib6_walker_lock); | |
1318 | ||
d8d1f30b | 1319 | rt->dst.rt6_next = NULL; |
1da177e4 | 1320 | |
1da177e4 | 1321 | /* If it was last route, expunge its radix tree node */ |
507c9b1e | 1322 | if (!fn->leaf) { |
1da177e4 | 1323 | fn->fn_flags &= ~RTN_RTINFO; |
c572872f | 1324 | net->ipv6.rt6_stats->fib_route_nodes--; |
8ed67789 | 1325 | fn = fib6_repair_tree(net, fn); |
1da177e4 LT |
1326 | } |
1327 | ||
1328 | if (atomic_read(&rt->rt6i_ref) != 1) { | |
1329 | /* This route is used as dummy address holder in some split | |
1330 | * nodes. It is not leaked, but it still holds other resources, | |
1331 | * which must be released in time. So, scan ascendant nodes | |
1332 | * and replace dummy references to this route with references | |
1333 | * to still alive ones. | |
1334 | */ | |
1335 | while (fn) { | |
507c9b1e | 1336 | if (!(fn->fn_flags & RTN_RTINFO) && fn->leaf == rt) { |
8ed67789 | 1337 | fn->leaf = fib6_find_prefix(net, fn); |
1da177e4 LT |
1338 | atomic_inc(&fn->leaf->rt6i_ref); |
1339 | rt6_release(rt); | |
1340 | } | |
1341 | fn = fn->parent; | |
1342 | } | |
1343 | /* No more references are possible at this point. */ | |
2df96af0 | 1344 | BUG_ON(atomic_read(&rt->rt6i_ref) != 1); |
1da177e4 LT |
1345 | } |
1346 | ||
86872cb5 | 1347 | inet6_rt_notify(RTM_DELROUTE, rt, info); |
1da177e4 LT |
1348 | rt6_release(rt); |
1349 | } | |
1350 | ||
86872cb5 | 1351 | int fib6_del(struct rt6_info *rt, struct nl_info *info) |
1da177e4 | 1352 | { |
8ed67789 | 1353 | struct net *net = info->nl_net; |
1da177e4 LT |
1354 | struct fib6_node *fn = rt->rt6i_node; |
1355 | struct rt6_info **rtp; | |
1356 | ||
1357 | #if RT6_DEBUG >= 2 | |
d8d1f30b | 1358 | if (rt->dst.obsolete>0) { |
547b792c | 1359 | WARN_ON(fn != NULL); |
1da177e4 LT |
1360 | return -ENOENT; |
1361 | } | |
1362 | #endif | |
507c9b1e | 1363 | if (!fn || rt == net->ipv6.ip6_null_entry) |
1da177e4 LT |
1364 | return -ENOENT; |
1365 | ||
547b792c | 1366 | WARN_ON(!(fn->fn_flags & RTN_RTINFO)); |
1da177e4 | 1367 | |
507c9b1e | 1368 | if (!(rt->rt6i_flags & RTF_CACHE)) { |
150730d5 YH |
1369 | struct fib6_node *pn = fn; |
1370 | #ifdef CONFIG_IPV6_SUBTREES | |
1371 | /* clones of this route might be in another subtree */ | |
1372 | if (rt->rt6i_src.plen) { | |
507c9b1e | 1373 | while (!(pn->fn_flags & RTN_ROOT)) |
150730d5 YH |
1374 | pn = pn->parent; |
1375 | pn = pn->parent; | |
1376 | } | |
1377 | #endif | |
ec7d43c2 | 1378 | fib6_prune_clones(info->nl_net, pn, rt); |
150730d5 | 1379 | } |
1da177e4 LT |
1380 | |
1381 | /* | |
1382 | * Walk the leaf entries looking for ourself | |
1383 | */ | |
1384 | ||
d8d1f30b | 1385 | for (rtp = &fn->leaf; *rtp; rtp = &(*rtp)->dst.rt6_next) { |
1da177e4 | 1386 | if (*rtp == rt) { |
86872cb5 | 1387 | fib6_del_route(fn, rtp, info); |
1da177e4 LT |
1388 | return 0; |
1389 | } | |
1390 | } | |
1391 | return -ENOENT; | |
1392 | } | |
1393 | ||
1394 | /* | |
1395 | * Tree traversal function. | |
1396 | * | |
1397 | * Certainly, it is not interrupt safe. | |
1398 | * However, it is internally reenterable wrt itself and fib6_add/fib6_del. | |
1399 | * It means, that we can modify tree during walking | |
1400 | * and use this function for garbage collection, clone pruning, | |
1ab1457c | 1401 | * cleaning tree when a device goes down etc. etc. |
1da177e4 LT |
1402 | * |
1403 | * It guarantees that every node will be traversed, | |
1404 | * and that it will be traversed only once. | |
1405 | * | |
1406 | * Callback function w->func may return: | |
1407 | * 0 -> continue walking. | |
1408 | * positive value -> walking is suspended (used by tree dumps, | |
1409 | * and probably by gc, if it will be split to several slices) | |
1410 | * negative value -> terminate walking. | |
1411 | * | |
1412 | * The function itself returns: | |
1413 | * 0 -> walk is complete. | |
1414 | * >0 -> walk is incomplete (i.e. suspended) | |
1415 | * <0 -> walk is terminated by an error. | |
1416 | */ | |
1417 | ||
90d41122 | 1418 | static int fib6_walk_continue(struct fib6_walker_t *w) |
1da177e4 LT |
1419 | { |
1420 | struct fib6_node *fn, *pn; | |
1421 | ||
1422 | for (;;) { | |
1423 | fn = w->node; | |
507c9b1e | 1424 | if (!fn) |
1da177e4 LT |
1425 | return 0; |
1426 | ||
1427 | if (w->prune && fn != w->root && | |
507c9b1e | 1428 | fn->fn_flags & RTN_RTINFO && w->state < FWS_C) { |
1da177e4 LT |
1429 | w->state = FWS_C; |
1430 | w->leaf = fn->leaf; | |
1431 | } | |
1432 | switch (w->state) { | |
1433 | #ifdef CONFIG_IPV6_SUBTREES | |
1434 | case FWS_S: | |
7fc33165 YH |
1435 | if (FIB6_SUBTREE(fn)) { |
1436 | w->node = FIB6_SUBTREE(fn); | |
1da177e4 LT |
1437 | continue; |
1438 | } | |
1439 | w->state = FWS_L; | |
1ab1457c | 1440 | #endif |
1da177e4 LT |
1441 | case FWS_L: |
1442 | if (fn->left) { | |
1443 | w->node = fn->left; | |
1444 | w->state = FWS_INIT; | |
1445 | continue; | |
1446 | } | |
1447 | w->state = FWS_R; | |
1448 | case FWS_R: | |
1449 | if (fn->right) { | |
1450 | w->node = fn->right; | |
1451 | w->state = FWS_INIT; | |
1452 | continue; | |
1453 | } | |
1454 | w->state = FWS_C; | |
1455 | w->leaf = fn->leaf; | |
1456 | case FWS_C: | |
507c9b1e | 1457 | if (w->leaf && fn->fn_flags & RTN_RTINFO) { |
2bec5a36 PM |
1458 | int err; |
1459 | ||
fa809e2f ED |
1460 | if (w->skip) { |
1461 | w->skip--; | |
2bec5a36 PM |
1462 | continue; |
1463 | } | |
1464 | ||
1465 | err = w->func(w); | |
1da177e4 LT |
1466 | if (err) |
1467 | return err; | |
2bec5a36 PM |
1468 | |
1469 | w->count++; | |
1da177e4 LT |
1470 | continue; |
1471 | } | |
1472 | w->state = FWS_U; | |
1473 | case FWS_U: | |
1474 | if (fn == w->root) | |
1475 | return 0; | |
1476 | pn = fn->parent; | |
1477 | w->node = pn; | |
1478 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1479 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1480 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
1da177e4 LT |
1481 | w->state = FWS_L; |
1482 | continue; | |
1483 | } | |
1484 | #endif | |
1485 | if (pn->left == fn) { | |
1486 | w->state = FWS_R; | |
1487 | continue; | |
1488 | } | |
1489 | if (pn->right == fn) { | |
1490 | w->state = FWS_C; | |
1491 | w->leaf = w->node->leaf; | |
1492 | continue; | |
1493 | } | |
1494 | #if RT6_DEBUG >= 2 | |
547b792c | 1495 | WARN_ON(1); |
1da177e4 LT |
1496 | #endif |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | ||
90d41122 | 1501 | static int fib6_walk(struct fib6_walker_t *w) |
1da177e4 LT |
1502 | { |
1503 | int res; | |
1504 | ||
1505 | w->state = FWS_INIT; | |
1506 | w->node = w->root; | |
1507 | ||
1508 | fib6_walker_link(w); | |
1509 | res = fib6_walk_continue(w); | |
1510 | if (res <= 0) | |
1511 | fib6_walker_unlink(w); | |
1512 | return res; | |
1513 | } | |
1514 | ||
1515 | static int fib6_clean_node(struct fib6_walker_t *w) | |
1516 | { | |
1517 | int res; | |
1518 | struct rt6_info *rt; | |
0a8891a0 | 1519 | struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w); |
ec7d43c2 BT |
1520 | struct nl_info info = { |
1521 | .nl_net = c->net, | |
1522 | }; | |
1da177e4 | 1523 | |
d8d1f30b | 1524 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 LT |
1525 | res = c->func(rt, c->arg); |
1526 | if (res < 0) { | |
1527 | w->leaf = rt; | |
528c4ceb | 1528 | res = fib6_del(rt, &info); |
1da177e4 LT |
1529 | if (res) { |
1530 | #if RT6_DEBUG >= 2 | |
91df42be JP |
1531 | pr_debug("%s: del failed: rt=%p@%p err=%d\n", |
1532 | __func__, rt, rt->rt6i_node, res); | |
1da177e4 LT |
1533 | #endif |
1534 | continue; | |
1535 | } | |
1536 | return 0; | |
1537 | } | |
547b792c | 1538 | WARN_ON(res != 0); |
1da177e4 LT |
1539 | } |
1540 | w->leaf = rt; | |
1541 | return 0; | |
1542 | } | |
1543 | ||
1544 | /* | |
1545 | * Convenient frontend to tree walker. | |
1ab1457c | 1546 | * |
1da177e4 LT |
1547 | * func is called on each route. |
1548 | * It may return -1 -> delete this route. | |
1549 | * 0 -> continue walking | |
1550 | * | |
1551 | * prune==1 -> only immediate children of node (certainly, | |
1552 | * ignoring pure split nodes) will be scanned. | |
1553 | */ | |
1554 | ||
ec7d43c2 | 1555 | static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
8ce11e6a AB |
1556 | int (*func)(struct rt6_info *, void *arg), |
1557 | int prune, void *arg) | |
1da177e4 LT |
1558 | { |
1559 | struct fib6_cleaner_t c; | |
1560 | ||
1561 | c.w.root = root; | |
1562 | c.w.func = fib6_clean_node; | |
1563 | c.w.prune = prune; | |
2bec5a36 PM |
1564 | c.w.count = 0; |
1565 | c.w.skip = 0; | |
1da177e4 LT |
1566 | c.func = func; |
1567 | c.arg = arg; | |
ec7d43c2 | 1568 | c.net = net; |
1da177e4 LT |
1569 | |
1570 | fib6_walk(&c.w); | |
1571 | } | |
1572 | ||
f3db4851 | 1573 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 1574 | void *arg) |
c71099ac | 1575 | { |
c71099ac | 1576 | struct fib6_table *table; |
58f09b78 | 1577 | struct hlist_head *head; |
1b43af54 | 1578 | unsigned int h; |
c71099ac | 1579 | |
1b43af54 | 1580 | rcu_read_lock(); |
a33bc5c1 | 1581 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
f3db4851 | 1582 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 1583 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { |
c71099ac | 1584 | write_lock_bh(&table->tb6_lock); |
ec7d43c2 | 1585 | fib6_clean_tree(net, &table->tb6_root, |
0c3584d5 | 1586 | func, 0, arg); |
c71099ac TG |
1587 | write_unlock_bh(&table->tb6_lock); |
1588 | } | |
1589 | } | |
1b43af54 | 1590 | rcu_read_unlock(); |
c71099ac TG |
1591 | } |
1592 | ||
1da177e4 LT |
1593 | static int fib6_prune_clone(struct rt6_info *rt, void *arg) |
1594 | { | |
1595 | if (rt->rt6i_flags & RTF_CACHE) { | |
1596 | RT6_TRACE("pruning clone %p\n", rt); | |
1597 | return -1; | |
1598 | } | |
1599 | ||
1600 | return 0; | |
1601 | } | |
1602 | ||
ec7d43c2 BT |
1603 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
1604 | struct rt6_info *rt) | |
1da177e4 | 1605 | { |
ec7d43c2 | 1606 | fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt); |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | /* | |
1610 | * Garbage collection | |
1611 | */ | |
1612 | ||
1613 | static struct fib6_gc_args | |
1614 | { | |
1615 | int timeout; | |
1616 | int more; | |
1617 | } gc_args; | |
1618 | ||
1619 | static int fib6_age(struct rt6_info *rt, void *arg) | |
1620 | { | |
1621 | unsigned long now = jiffies; | |
1622 | ||
1623 | /* | |
1624 | * check addrconf expiration here. | |
1625 | * Routes are expired even if they are in use. | |
1626 | * | |
1627 | * Also age clones. Note, that clones are aged out | |
1628 | * only if they are not in use now. | |
1629 | */ | |
1630 | ||
d1918542 DM |
1631 | if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) { |
1632 | if (time_after(now, rt->dst.expires)) { | |
1da177e4 | 1633 | RT6_TRACE("expiring %p\n", rt); |
1da177e4 LT |
1634 | return -1; |
1635 | } | |
1636 | gc_args.more++; | |
1637 | } else if (rt->rt6i_flags & RTF_CACHE) { | |
d8d1f30b CG |
1638 | if (atomic_read(&rt->dst.__refcnt) == 0 && |
1639 | time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) { | |
1da177e4 LT |
1640 | RT6_TRACE("aging clone %p\n", rt); |
1641 | return -1; | |
5339ab8b DM |
1642 | } else if (rt->rt6i_flags & RTF_GATEWAY) { |
1643 | struct neighbour *neigh; | |
1644 | __u8 neigh_flags = 0; | |
1645 | ||
1646 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
1647 | if (neigh) { | |
1648 | neigh_flags = neigh->flags; | |
1649 | neigh_release(neigh); | |
1650 | } | |
8bd74516 | 1651 | if (!(neigh_flags & NTF_ROUTER)) { |
5339ab8b DM |
1652 | RT6_TRACE("purging route %p via non-router but gateway\n", |
1653 | rt); | |
1654 | return -1; | |
1655 | } | |
1da177e4 LT |
1656 | } |
1657 | gc_args.more++; | |
1658 | } | |
1659 | ||
1660 | return 0; | |
1661 | } | |
1662 | ||
1663 | static DEFINE_SPINLOCK(fib6_gc_lock); | |
1664 | ||
2ac3ac8f | 1665 | void fib6_run_gc(unsigned long expires, struct net *net, bool force) |
1da177e4 | 1666 | { |
49a18d86 MK |
1667 | unsigned long now; |
1668 | ||
2ac3ac8f | 1669 | if (force) { |
1da177e4 | 1670 | spin_lock_bh(&fib6_gc_lock); |
2ac3ac8f MK |
1671 | } else if (!spin_trylock_bh(&fib6_gc_lock)) { |
1672 | mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); | |
1673 | return; | |
1da177e4 | 1674 | } |
2ac3ac8f MK |
1675 | gc_args.timeout = expires ? (int)expires : |
1676 | net->ipv6.sysctl.ip6_rt_gc_interval; | |
1da177e4 | 1677 | |
3d0f24a7 | 1678 | gc_args.more = icmp6_dst_gc(); |
f3db4851 | 1679 | |
0c3584d5 | 1680 | fib6_clean_all(net, fib6_age, NULL); |
49a18d86 MK |
1681 | now = jiffies; |
1682 | net->ipv6.ip6_rt_last_gc = now; | |
1da177e4 LT |
1683 | |
1684 | if (gc_args.more) | |
c8a45222 | 1685 | mod_timer(&net->ipv6.ip6_fib_timer, |
49a18d86 | 1686 | round_jiffies(now |
c8a45222 | 1687 | + net->ipv6.sysctl.ip6_rt_gc_interval)); |
417f28bb SH |
1688 | else |
1689 | del_timer(&net->ipv6.ip6_fib_timer); | |
1da177e4 LT |
1690 | spin_unlock_bh(&fib6_gc_lock); |
1691 | } | |
1692 | ||
5b7c931d DL |
1693 | static void fib6_gc_timer_cb(unsigned long arg) |
1694 | { | |
2ac3ac8f | 1695 | fib6_run_gc(0, (struct net *)arg, true); |
5b7c931d DL |
1696 | } |
1697 | ||
2c8c1e72 | 1698 | static int __net_init fib6_net_init(struct net *net) |
1da177e4 | 1699 | { |
10da66f7 ED |
1700 | size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
1701 | ||
417f28bb | 1702 | setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); |
63152fc0 | 1703 | |
c572872f BT |
1704 | net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); |
1705 | if (!net->ipv6.rt6_stats) | |
1706 | goto out_timer; | |
1707 | ||
10da66f7 ED |
1708 | /* Avoid false sharing : Use at least a full cache line */ |
1709 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1710 | ||
1711 | net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); | |
58f09b78 | 1712 | if (!net->ipv6.fib_table_hash) |
c572872f | 1713 | goto out_rt6_stats; |
e0b85590 | 1714 | |
58f09b78 DL |
1715 | net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), |
1716 | GFP_KERNEL); | |
1717 | if (!net->ipv6.fib6_main_tbl) | |
e0b85590 DL |
1718 | goto out_fib_table_hash; |
1719 | ||
58f09b78 | 1720 | net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
8ed67789 | 1721 | net->ipv6.fib6_main_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1722 | net->ipv6.fib6_main_tbl->tb6_root.fn_flags = |
1723 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1724 | inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers); |
e0b85590 DL |
1725 | |
1726 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
58f09b78 DL |
1727 | net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), |
1728 | GFP_KERNEL); | |
1729 | if (!net->ipv6.fib6_local_tbl) | |
e0b85590 | 1730 | goto out_fib6_main_tbl; |
58f09b78 | 1731 | net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
8ed67789 | 1732 | net->ipv6.fib6_local_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1733 | net->ipv6.fib6_local_tbl->tb6_root.fn_flags = |
1734 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1735 | inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers); |
e0b85590 | 1736 | #endif |
58f09b78 | 1737 | fib6_tables_init(net); |
f845ab6b | 1738 | |
417f28bb | 1739 | return 0; |
d63bddbe | 1740 | |
e0b85590 | 1741 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 1742 | out_fib6_main_tbl: |
58f09b78 | 1743 | kfree(net->ipv6.fib6_main_tbl); |
e0b85590 | 1744 | #endif |
e0b85590 | 1745 | out_fib_table_hash: |
58f09b78 | 1746 | kfree(net->ipv6.fib_table_hash); |
c572872f BT |
1747 | out_rt6_stats: |
1748 | kfree(net->ipv6.rt6_stats); | |
63152fc0 | 1749 | out_timer: |
417f28bb | 1750 | return -ENOMEM; |
58f09b78 DL |
1751 | } |
1752 | ||
1753 | static void fib6_net_exit(struct net *net) | |
1754 | { | |
8ed67789 | 1755 | rt6_ifdown(net, NULL); |
417f28bb SH |
1756 | del_timer_sync(&net->ipv6.ip6_fib_timer); |
1757 | ||
58f09b78 | 1758 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
8e773277 | 1759 | inetpeer_invalidate_tree(&net->ipv6.fib6_local_tbl->tb6_peers); |
58f09b78 DL |
1760 | kfree(net->ipv6.fib6_local_tbl); |
1761 | #endif | |
8e773277 | 1762 | inetpeer_invalidate_tree(&net->ipv6.fib6_main_tbl->tb6_peers); |
58f09b78 DL |
1763 | kfree(net->ipv6.fib6_main_tbl); |
1764 | kfree(net->ipv6.fib_table_hash); | |
c572872f | 1765 | kfree(net->ipv6.rt6_stats); |
58f09b78 DL |
1766 | } |
1767 | ||
1768 | static struct pernet_operations fib6_net_ops = { | |
1769 | .init = fib6_net_init, | |
1770 | .exit = fib6_net_exit, | |
1771 | }; | |
1772 | ||
1773 | int __init fib6_init(void) | |
1774 | { | |
1775 | int ret = -ENOMEM; | |
63152fc0 | 1776 | |
58f09b78 DL |
1777 | fib6_node_kmem = kmem_cache_create("fib6_nodes", |
1778 | sizeof(struct fib6_node), | |
1779 | 0, SLAB_HWCACHE_ALIGN, | |
1780 | NULL); | |
1781 | if (!fib6_node_kmem) | |
1782 | goto out; | |
1783 | ||
1784 | ret = register_pernet_subsys(&fib6_net_ops); | |
1785 | if (ret) | |
c572872f | 1786 | goto out_kmem_cache_create; |
e8803b6c DM |
1787 | |
1788 | ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib, | |
1789 | NULL); | |
1790 | if (ret) | |
1791 | goto out_unregister_subsys; | |
58f09b78 DL |
1792 | out: |
1793 | return ret; | |
1794 | ||
e8803b6c DM |
1795 | out_unregister_subsys: |
1796 | unregister_pernet_subsys(&fib6_net_ops); | |
d63bddbe DL |
1797 | out_kmem_cache_create: |
1798 | kmem_cache_destroy(fib6_node_kmem); | |
1799 | goto out; | |
1da177e4 LT |
1800 | } |
1801 | ||
1802 | void fib6_gc_cleanup(void) | |
1803 | { | |
58f09b78 | 1804 | unregister_pernet_subsys(&fib6_net_ops); |
1da177e4 LT |
1805 | kmem_cache_destroy(fib6_node_kmem); |
1806 | } | |
8d2ca1d7 HFS |
1807 | |
1808 | #ifdef CONFIG_PROC_FS | |
1809 | ||
1810 | struct ipv6_route_iter { | |
1811 | struct seq_net_private p; | |
1812 | struct fib6_walker_t w; | |
1813 | loff_t skip; | |
1814 | struct fib6_table *tbl; | |
0a67d3ef | 1815 | __u32 sernum; |
8d2ca1d7 HFS |
1816 | }; |
1817 | ||
1818 | static int ipv6_route_seq_show(struct seq_file *seq, void *v) | |
1819 | { | |
1820 | struct rt6_info *rt = v; | |
1821 | struct ipv6_route_iter *iter = seq->private; | |
1822 | ||
1823 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); | |
1824 | ||
1825 | #ifdef CONFIG_IPV6_SUBTREES | |
1826 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); | |
1827 | #else | |
1828 | seq_puts(seq, "00000000000000000000000000000000 00 "); | |
1829 | #endif | |
1830 | if (rt->rt6i_flags & RTF_GATEWAY) | |
1831 | seq_printf(seq, "%pi6", &rt->rt6i_gateway); | |
1832 | else | |
1833 | seq_puts(seq, "00000000000000000000000000000000"); | |
1834 | ||
1835 | seq_printf(seq, " %08x %08x %08x %08x %8s\n", | |
1836 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), | |
1837 | rt->dst.__use, rt->rt6i_flags, | |
1838 | rt->dst.dev ? rt->dst.dev->name : ""); | |
1839 | iter->w.leaf = NULL; | |
1840 | return 0; | |
1841 | } | |
1842 | ||
1843 | static int ipv6_route_yield(struct fib6_walker_t *w) | |
1844 | { | |
1845 | struct ipv6_route_iter *iter = w->args; | |
1846 | ||
1847 | if (!iter->skip) | |
1848 | return 1; | |
1849 | ||
1850 | do { | |
1851 | iter->w.leaf = iter->w.leaf->dst.rt6_next; | |
1852 | iter->skip--; | |
1853 | if (!iter->skip && iter->w.leaf) | |
1854 | return 1; | |
1855 | } while (iter->w.leaf); | |
1856 | ||
1857 | return 0; | |
1858 | } | |
1859 | ||
1860 | static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter) | |
1861 | { | |
1862 | memset(&iter->w, 0, sizeof(iter->w)); | |
1863 | iter->w.func = ipv6_route_yield; | |
1864 | iter->w.root = &iter->tbl->tb6_root; | |
1865 | iter->w.state = FWS_INIT; | |
1866 | iter->w.node = iter->w.root; | |
1867 | iter->w.args = iter; | |
0a67d3ef | 1868 | iter->sernum = iter->w.root->fn_sernum; |
8d2ca1d7 HFS |
1869 | INIT_LIST_HEAD(&iter->w.lh); |
1870 | fib6_walker_link(&iter->w); | |
1871 | } | |
1872 | ||
1873 | static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl, | |
1874 | struct net *net) | |
1875 | { | |
1876 | unsigned int h; | |
1877 | struct hlist_node *node; | |
1878 | ||
1879 | if (tbl) { | |
1880 | h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1; | |
1881 | node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist)); | |
1882 | } else { | |
1883 | h = 0; | |
1884 | node = NULL; | |
1885 | } | |
1886 | ||
1887 | while (!node && h < FIB6_TABLE_HASHSZ) { | |
1888 | node = rcu_dereference_bh( | |
1889 | hlist_first_rcu(&net->ipv6.fib_table_hash[h++])); | |
1890 | } | |
1891 | return hlist_entry_safe(node, struct fib6_table, tb6_hlist); | |
1892 | } | |
1893 | ||
0a67d3ef HFS |
1894 | static void ipv6_route_check_sernum(struct ipv6_route_iter *iter) |
1895 | { | |
1896 | if (iter->sernum != iter->w.root->fn_sernum) { | |
1897 | iter->sernum = iter->w.root->fn_sernum; | |
1898 | iter->w.state = FWS_INIT; | |
1899 | iter->w.node = iter->w.root; | |
1900 | WARN_ON(iter->w.skip); | |
1901 | iter->w.skip = iter->w.count; | |
1902 | } | |
1903 | } | |
1904 | ||
8d2ca1d7 HFS |
1905 | static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1906 | { | |
1907 | int r; | |
1908 | struct rt6_info *n; | |
1909 | struct net *net = seq_file_net(seq); | |
1910 | struct ipv6_route_iter *iter = seq->private; | |
1911 | ||
1912 | if (!v) | |
1913 | goto iter_table; | |
1914 | ||
1915 | n = ((struct rt6_info *)v)->dst.rt6_next; | |
1916 | if (n) { | |
1917 | ++*pos; | |
1918 | return n; | |
1919 | } | |
1920 | ||
1921 | iter_table: | |
0a67d3ef | 1922 | ipv6_route_check_sernum(iter); |
8d2ca1d7 HFS |
1923 | read_lock(&iter->tbl->tb6_lock); |
1924 | r = fib6_walk_continue(&iter->w); | |
1925 | read_unlock(&iter->tbl->tb6_lock); | |
1926 | if (r > 0) { | |
1927 | if (v) | |
1928 | ++*pos; | |
1929 | return iter->w.leaf; | |
1930 | } else if (r < 0) { | |
1931 | fib6_walker_unlink(&iter->w); | |
1932 | return NULL; | |
1933 | } | |
1934 | fib6_walker_unlink(&iter->w); | |
1935 | ||
1936 | iter->tbl = ipv6_route_seq_next_table(iter->tbl, net); | |
1937 | if (!iter->tbl) | |
1938 | return NULL; | |
1939 | ||
1940 | ipv6_route_seq_setup_walk(iter); | |
1941 | goto iter_table; | |
1942 | } | |
1943 | ||
1944 | static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos) | |
1945 | __acquires(RCU_BH) | |
1946 | { | |
1947 | struct net *net = seq_file_net(seq); | |
1948 | struct ipv6_route_iter *iter = seq->private; | |
1949 | ||
1950 | rcu_read_lock_bh(); | |
1951 | iter->tbl = ipv6_route_seq_next_table(NULL, net); | |
1952 | iter->skip = *pos; | |
1953 | ||
1954 | if (iter->tbl) { | |
1955 | ipv6_route_seq_setup_walk(iter); | |
1956 | return ipv6_route_seq_next(seq, NULL, pos); | |
1957 | } else { | |
1958 | return NULL; | |
1959 | } | |
1960 | } | |
1961 | ||
1962 | static bool ipv6_route_iter_active(struct ipv6_route_iter *iter) | |
1963 | { | |
1964 | struct fib6_walker_t *w = &iter->w; | |
1965 | return w->node && !(w->state == FWS_U && w->node == w->root); | |
1966 | } | |
1967 | ||
1968 | static void ipv6_route_seq_stop(struct seq_file *seq, void *v) | |
1969 | __releases(RCU_BH) | |
1970 | { | |
1971 | struct ipv6_route_iter *iter = seq->private; | |
1972 | ||
1973 | if (ipv6_route_iter_active(iter)) | |
1974 | fib6_walker_unlink(&iter->w); | |
1975 | ||
1976 | rcu_read_unlock_bh(); | |
1977 | } | |
1978 | ||
1979 | static const struct seq_operations ipv6_route_seq_ops = { | |
1980 | .start = ipv6_route_seq_start, | |
1981 | .next = ipv6_route_seq_next, | |
1982 | .stop = ipv6_route_seq_stop, | |
1983 | .show = ipv6_route_seq_show | |
1984 | }; | |
1985 | ||
1986 | int ipv6_route_open(struct inode *inode, struct file *file) | |
1987 | { | |
1988 | return seq_open_net(inode, file, &ipv6_route_seq_ops, | |
1989 | sizeof(struct ipv6_route_iter)); | |
1990 | } | |
1991 | ||
1992 | #endif /* CONFIG_PROC_FS */ |