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Commit | Line | Data |
---|---|---|
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. | |
8db46f1d WY |
12 | * |
13 | * Changes: | |
14 | * Yuji SEKIYA @USAGI: Support default route on router node; | |
15 | * remove ip6_null_entry from the top of | |
16 | * routing table. | |
17 | * Ville Nuorvala: Fixed routing subtrees. | |
1da177e4 | 18 | */ |
f3213831 JP |
19 | |
20 | #define pr_fmt(fmt) "IPv6: " fmt | |
21 | ||
1da177e4 LT |
22 | #include <linux/errno.h> |
23 | #include <linux/types.h> | |
24 | #include <linux/net.h> | |
25 | #include <linux/route.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/in6.h> | |
28 | #include <linux/init.h> | |
c71099ac | 29 | #include <linux/list.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
1da177e4 | 31 | |
1da177e4 LT |
32 | #include <net/ipv6.h> |
33 | #include <net/ndisc.h> | |
34 | #include <net/addrconf.h> | |
35 | ||
36 | #include <net/ip6_fib.h> | |
37 | #include <net/ip6_route.h> | |
38 | ||
39 | #define RT6_DEBUG 2 | |
40 | ||
41 | #if RT6_DEBUG >= 3 | |
91df42be | 42 | #define RT6_TRACE(x...) pr_debug(x) |
1da177e4 LT |
43 | #else |
44 | #define RT6_TRACE(x...) do { ; } while (0) | |
45 | #endif | |
46 | ||
437de07c | 47 | static struct kmem_cache *fib6_node_kmem __read_mostly; |
1da177e4 | 48 | |
49e253e3 | 49 | enum fib_walk_state_t { |
1da177e4 LT |
50 | #ifdef CONFIG_IPV6_SUBTREES |
51 | FWS_S, | |
52 | #endif | |
53 | FWS_L, | |
54 | FWS_R, | |
55 | FWS_C, | |
56 | FWS_U | |
57 | }; | |
58 | ||
49e253e3 | 59 | struct fib6_cleaner_t { |
1da177e4 | 60 | struct fib6_walker_t w; |
ec7d43c2 | 61 | struct net *net; |
1da177e4 LT |
62 | int (*func)(struct rt6_info *, void *arg); |
63 | void *arg; | |
64 | }; | |
65 | ||
90d41122 | 66 | static DEFINE_RWLOCK(fib6_walker_lock); |
1da177e4 LT |
67 | |
68 | #ifdef CONFIG_IPV6_SUBTREES | |
69 | #define FWS_INIT FWS_S | |
1da177e4 LT |
70 | #else |
71 | #define FWS_INIT FWS_L | |
1da177e4 LT |
72 | #endif |
73 | ||
ec7d43c2 BT |
74 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
75 | struct rt6_info *rt); | |
8ed67789 DL |
76 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn); |
77 | static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn); | |
90d41122 AB |
78 | static int fib6_walk(struct fib6_walker_t *w); |
79 | static int fib6_walk_continue(struct fib6_walker_t *w); | |
1da177e4 LT |
80 | |
81 | /* | |
82 | * A routing update causes an increase of the serial number on the | |
83 | * affected subtree. This allows for cached routes to be asynchronously | |
84 | * tested when modifications are made to the destination cache as a | |
85 | * result of redirects, path MTU changes, etc. | |
86 | */ | |
87 | ||
88 | static __u32 rt_sernum; | |
89 | ||
5b7c931d DL |
90 | static void fib6_gc_timer_cb(unsigned long arg); |
91 | ||
bbef49da AD |
92 | static LIST_HEAD(fib6_walkers); |
93 | #define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) | |
1da177e4 | 94 | |
90d41122 AB |
95 | static inline void fib6_walker_link(struct fib6_walker_t *w) |
96 | { | |
97 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 98 | list_add(&w->lh, &fib6_walkers); |
90d41122 AB |
99 | write_unlock_bh(&fib6_walker_lock); |
100 | } | |
101 | ||
102 | static inline void fib6_walker_unlink(struct fib6_walker_t *w) | |
103 | { | |
104 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 105 | list_del(&w->lh); |
90d41122 AB |
106 | write_unlock_bh(&fib6_walker_lock); |
107 | } | |
1da177e4 LT |
108 | static __inline__ u32 fib6_new_sernum(void) |
109 | { | |
110 | u32 n = ++rt_sernum; | |
111 | if ((__s32)n <= 0) | |
112 | rt_sernum = n = 1; | |
113 | return n; | |
114 | } | |
115 | ||
116 | /* | |
117 | * Auxiliary address test functions for the radix tree. | |
118 | * | |
1ab1457c | 119 | * These assume a 32bit processor (although it will work on |
1da177e4 LT |
120 | * 64bit processors) |
121 | */ | |
122 | ||
123 | /* | |
124 | * test bit | |
125 | */ | |
02cdce53 YH |
126 | #if defined(__LITTLE_ENDIAN) |
127 | # define BITOP_BE32_SWIZZLE (0x1F & ~7) | |
128 | #else | |
129 | # define BITOP_BE32_SWIZZLE 0 | |
130 | #endif | |
1da177e4 | 131 | |
b71d1d42 | 132 | static __inline__ __be32 addr_bit_set(const void *token, int fn_bit) |
1da177e4 | 133 | { |
b71d1d42 | 134 | const __be32 *addr = token; |
02cdce53 YH |
135 | /* |
136 | * Here, | |
8db46f1d | 137 | * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) |
02cdce53 YH |
138 | * is optimized version of |
139 | * htonl(1 << ((~fn_bit)&0x1F)) | |
140 | * See include/asm-generic/bitops/le.h. | |
141 | */ | |
0eae88f3 ED |
142 | return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & |
143 | addr[fn_bit >> 5]; | |
1da177e4 LT |
144 | } |
145 | ||
437de07c | 146 | static __inline__ struct fib6_node *node_alloc(void) |
1da177e4 LT |
147 | { |
148 | struct fib6_node *fn; | |
149 | ||
c3762229 | 150 | fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
1da177e4 LT |
151 | |
152 | return fn; | |
153 | } | |
154 | ||
437de07c | 155 | static __inline__ void node_free(struct fib6_node *fn) |
1da177e4 LT |
156 | { |
157 | kmem_cache_free(fib6_node_kmem, fn); | |
158 | } | |
159 | ||
160 | static __inline__ void rt6_release(struct rt6_info *rt) | |
161 | { | |
162 | if (atomic_dec_and_test(&rt->rt6i_ref)) | |
d8d1f30b | 163 | dst_free(&rt->dst); |
1da177e4 LT |
164 | } |
165 | ||
58f09b78 | 166 | static void fib6_link_table(struct net *net, struct fib6_table *tb) |
1b43af54 PM |
167 | { |
168 | unsigned int h; | |
169 | ||
375216ad TG |
170 | /* |
171 | * Initialize table lock at a single place to give lockdep a key, | |
172 | * tables aren't visible prior to being linked to the list. | |
173 | */ | |
174 | rwlock_init(&tb->tb6_lock); | |
175 | ||
a33bc5c1 | 176 | h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
1b43af54 PM |
177 | |
178 | /* | |
179 | * No protection necessary, this is the only list mutatation | |
180 | * operation, tables never disappear once they exist. | |
181 | */ | |
58f09b78 | 182 | hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
1b43af54 | 183 | } |
c71099ac | 184 | |
1b43af54 | 185 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 186 | |
8ed67789 | 187 | static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
c71099ac TG |
188 | { |
189 | struct fib6_table *table; | |
190 | ||
191 | table = kzalloc(sizeof(*table), GFP_ATOMIC); | |
507c9b1e | 192 | if (table) { |
c71099ac | 193 | table->tb6_id = id; |
8ed67789 | 194 | table->tb6_root.leaf = net->ipv6.ip6_null_entry; |
c71099ac | 195 | table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
8e773277 | 196 | inet_peer_base_init(&table->tb6_peers); |
c71099ac TG |
197 | } |
198 | ||
199 | return table; | |
200 | } | |
201 | ||
58f09b78 | 202 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac TG |
203 | { |
204 | struct fib6_table *tb; | |
205 | ||
206 | if (id == 0) | |
207 | id = RT6_TABLE_MAIN; | |
58f09b78 | 208 | tb = fib6_get_table(net, id); |
c71099ac TG |
209 | if (tb) |
210 | return tb; | |
211 | ||
8ed67789 | 212 | tb = fib6_alloc_table(net, id); |
507c9b1e | 213 | if (tb) |
58f09b78 | 214 | fib6_link_table(net, tb); |
c71099ac TG |
215 | |
216 | return tb; | |
217 | } | |
218 | ||
58f09b78 | 219 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac TG |
220 | { |
221 | struct fib6_table *tb; | |
58f09b78 | 222 | struct hlist_head *head; |
c71099ac TG |
223 | unsigned int h; |
224 | ||
225 | if (id == 0) | |
226 | id = RT6_TABLE_MAIN; | |
a33bc5c1 | 227 | h = id & (FIB6_TABLE_HASHSZ - 1); |
c71099ac | 228 | rcu_read_lock(); |
58f09b78 | 229 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 230 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
c71099ac TG |
231 | if (tb->tb6_id == id) { |
232 | rcu_read_unlock(); | |
233 | return tb; | |
234 | } | |
235 | } | |
236 | rcu_read_unlock(); | |
237 | ||
238 | return NULL; | |
239 | } | |
240 | ||
2c8c1e72 | 241 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 242 | { |
58f09b78 DL |
243 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
244 | fib6_link_table(net, net->ipv6.fib6_local_tbl); | |
c71099ac | 245 | } |
c71099ac TG |
246 | #else |
247 | ||
58f09b78 | 248 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac | 249 | { |
58f09b78 | 250 | return fib6_get_table(net, id); |
c71099ac TG |
251 | } |
252 | ||
58f09b78 | 253 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac | 254 | { |
58f09b78 | 255 | return net->ipv6.fib6_main_tbl; |
c71099ac TG |
256 | } |
257 | ||
4c9483b2 | 258 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
58f09b78 | 259 | int flags, pol_lookup_t lookup) |
c71099ac | 260 | { |
4c9483b2 | 261 | return (struct dst_entry *) lookup(net, net->ipv6.fib6_main_tbl, fl6, flags); |
c71099ac TG |
262 | } |
263 | ||
2c8c1e72 | 264 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 265 | { |
58f09b78 | 266 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
c71099ac TG |
267 | } |
268 | ||
269 | #endif | |
270 | ||
1b43af54 PM |
271 | static int fib6_dump_node(struct fib6_walker_t *w) |
272 | { | |
273 | int res; | |
274 | struct rt6_info *rt; | |
275 | ||
d8d1f30b | 276 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1b43af54 PM |
277 | res = rt6_dump_route(rt, w->args); |
278 | if (res < 0) { | |
279 | /* Frame is full, suspend walking */ | |
280 | w->leaf = rt; | |
281 | return 1; | |
282 | } | |
547b792c | 283 | WARN_ON(res == 0); |
1b43af54 PM |
284 | } |
285 | w->leaf = NULL; | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static void fib6_dump_end(struct netlink_callback *cb) | |
290 | { | |
437de07c | 291 | struct fib6_walker_t *w = (void *)cb->args[2]; |
1b43af54 PM |
292 | |
293 | if (w) { | |
7891cc81 HX |
294 | if (cb->args[4]) { |
295 | cb->args[4] = 0; | |
296 | fib6_walker_unlink(w); | |
297 | } | |
1b43af54 PM |
298 | cb->args[2] = 0; |
299 | kfree(w); | |
300 | } | |
437de07c | 301 | cb->done = (void *)cb->args[3]; |
1b43af54 PM |
302 | cb->args[1] = 3; |
303 | } | |
304 | ||
305 | static int fib6_dump_done(struct netlink_callback *cb) | |
306 | { | |
307 | fib6_dump_end(cb); | |
308 | return cb->done ? cb->done(cb) : 0; | |
309 | } | |
310 | ||
311 | static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, | |
312 | struct netlink_callback *cb) | |
313 | { | |
314 | struct fib6_walker_t *w; | |
315 | int res; | |
316 | ||
317 | w = (void *)cb->args[2]; | |
318 | w->root = &table->tb6_root; | |
319 | ||
320 | if (cb->args[4] == 0) { | |
2bec5a36 PM |
321 | w->count = 0; |
322 | w->skip = 0; | |
323 | ||
1b43af54 PM |
324 | read_lock_bh(&table->tb6_lock); |
325 | res = fib6_walk(w); | |
326 | read_unlock_bh(&table->tb6_lock); | |
2bec5a36 | 327 | if (res > 0) { |
1b43af54 | 328 | cb->args[4] = 1; |
2bec5a36 PM |
329 | cb->args[5] = w->root->fn_sernum; |
330 | } | |
1b43af54 | 331 | } else { |
2bec5a36 PM |
332 | if (cb->args[5] != w->root->fn_sernum) { |
333 | /* Begin at the root if the tree changed */ | |
334 | cb->args[5] = w->root->fn_sernum; | |
335 | w->state = FWS_INIT; | |
336 | w->node = w->root; | |
337 | w->skip = w->count; | |
338 | } else | |
339 | w->skip = 0; | |
340 | ||
1b43af54 PM |
341 | read_lock_bh(&table->tb6_lock); |
342 | res = fib6_walk_continue(w); | |
343 | read_unlock_bh(&table->tb6_lock); | |
7891cc81 HX |
344 | if (res <= 0) { |
345 | fib6_walker_unlink(w); | |
346 | cb->args[4] = 0; | |
1b43af54 | 347 | } |
1b43af54 | 348 | } |
7891cc81 | 349 | |
1b43af54 PM |
350 | return res; |
351 | } | |
352 | ||
c127ea2c | 353 | static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1b43af54 | 354 | { |
3b1e0a65 | 355 | struct net *net = sock_net(skb->sk); |
1b43af54 PM |
356 | unsigned int h, s_h; |
357 | unsigned int e = 0, s_e; | |
358 | struct rt6_rtnl_dump_arg arg; | |
359 | struct fib6_walker_t *w; | |
360 | struct fib6_table *tb; | |
58f09b78 | 361 | struct hlist_head *head; |
1b43af54 PM |
362 | int res = 0; |
363 | ||
364 | s_h = cb->args[0]; | |
365 | s_e = cb->args[1]; | |
366 | ||
367 | w = (void *)cb->args[2]; | |
507c9b1e | 368 | if (!w) { |
1b43af54 PM |
369 | /* New dump: |
370 | * | |
371 | * 1. hook callback destructor. | |
372 | */ | |
373 | cb->args[3] = (long)cb->done; | |
374 | cb->done = fib6_dump_done; | |
375 | ||
376 | /* | |
377 | * 2. allocate and initialize walker. | |
378 | */ | |
379 | w = kzalloc(sizeof(*w), GFP_ATOMIC); | |
507c9b1e | 380 | if (!w) |
1b43af54 PM |
381 | return -ENOMEM; |
382 | w->func = fib6_dump_node; | |
383 | cb->args[2] = (long)w; | |
384 | } | |
385 | ||
386 | arg.skb = skb; | |
387 | arg.cb = cb; | |
191cd582 | 388 | arg.net = net; |
1b43af54 PM |
389 | w->args = &arg; |
390 | ||
e67f88dd | 391 | rcu_read_lock(); |
a33bc5c1 | 392 | for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
1b43af54 | 393 | e = 0; |
58f09b78 | 394 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 395 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
1b43af54 PM |
396 | if (e < s_e) |
397 | goto next; | |
398 | res = fib6_dump_table(tb, skb, cb); | |
399 | if (res != 0) | |
400 | goto out; | |
401 | next: | |
402 | e++; | |
403 | } | |
404 | } | |
405 | out: | |
e67f88dd | 406 | rcu_read_unlock(); |
1b43af54 PM |
407 | cb->args[1] = e; |
408 | cb->args[0] = h; | |
409 | ||
410 | res = res < 0 ? res : skb->len; | |
411 | if (res <= 0) | |
412 | fib6_dump_end(cb); | |
413 | return res; | |
414 | } | |
1da177e4 LT |
415 | |
416 | /* | |
417 | * Routing Table | |
418 | * | |
419 | * return the appropriate node for a routing tree "add" operation | |
420 | * by either creating and inserting or by returning an existing | |
421 | * node. | |
422 | */ | |
423 | ||
9225b230 | 424 | static struct fib6_node *fib6_add_1(struct fib6_node *root, |
425 | struct in6_addr *addr, int plen, | |
4a287eba MV |
426 | int offset, int allow_create, |
427 | int replace_required) | |
1da177e4 LT |
428 | { |
429 | struct fib6_node *fn, *in, *ln; | |
430 | struct fib6_node *pn = NULL; | |
431 | struct rt6key *key; | |
432 | int bit; | |
1ab1457c | 433 | __be32 dir = 0; |
1da177e4 LT |
434 | __u32 sernum = fib6_new_sernum(); |
435 | ||
436 | RT6_TRACE("fib6_add_1\n"); | |
437 | ||
438 | /* insert node in tree */ | |
439 | ||
440 | fn = root; | |
441 | ||
442 | do { | |
443 | key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
444 | ||
445 | /* | |
446 | * Prefix match | |
447 | */ | |
448 | if (plen < fn->fn_bit || | |
4a287eba | 449 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { |
14df015b MV |
450 | if (!allow_create) { |
451 | if (replace_required) { | |
f3213831 | 452 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
453 | return ERR_PTR(-ENOENT); |
454 | } | |
f3213831 | 455 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
14df015b | 456 | } |
1da177e4 | 457 | goto insert_above; |
4a287eba | 458 | } |
1ab1457c | 459 | |
1da177e4 LT |
460 | /* |
461 | * Exact match ? | |
462 | */ | |
1ab1457c | 463 | |
1da177e4 LT |
464 | if (plen == fn->fn_bit) { |
465 | /* clean up an intermediate node */ | |
507c9b1e | 466 | if (!(fn->fn_flags & RTN_RTINFO)) { |
1da177e4 LT |
467 | rt6_release(fn->leaf); |
468 | fn->leaf = NULL; | |
469 | } | |
1ab1457c | 470 | |
1da177e4 | 471 | fn->fn_sernum = sernum; |
1ab1457c | 472 | |
1da177e4 LT |
473 | return fn; |
474 | } | |
475 | ||
476 | /* | |
477 | * We have more bits to go | |
478 | */ | |
1ab1457c | 479 | |
1da177e4 LT |
480 | /* Try to walk down on tree. */ |
481 | fn->fn_sernum = sernum; | |
482 | dir = addr_bit_set(addr, fn->fn_bit); | |
483 | pn = fn; | |
8db46f1d | 484 | fn = dir ? fn->right : fn->left; |
1da177e4 LT |
485 | } while (fn); |
486 | ||
14df015b | 487 | if (!allow_create) { |
4a287eba MV |
488 | /* We should not create new node because |
489 | * NLM_F_REPLACE was specified without NLM_F_CREATE | |
490 | * I assume it is safe to require NLM_F_CREATE when | |
491 | * REPLACE flag is used! Later we may want to remove the | |
492 | * check for replace_required, because according | |
493 | * to netlink specification, NLM_F_CREATE | |
494 | * MUST be specified if new route is created. | |
495 | * That would keep IPv6 consistent with IPv4 | |
496 | */ | |
14df015b | 497 | if (replace_required) { |
f3213831 | 498 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
499 | return ERR_PTR(-ENOENT); |
500 | } | |
f3213831 | 501 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba | 502 | } |
1da177e4 LT |
503 | /* |
504 | * We walked to the bottom of tree. | |
505 | * Create new leaf node without children. | |
506 | */ | |
507 | ||
508 | ln = node_alloc(); | |
509 | ||
507c9b1e | 510 | if (!ln) |
188c517a | 511 | return ERR_PTR(-ENOMEM); |
1da177e4 | 512 | ln->fn_bit = plen; |
1ab1457c | 513 | |
1da177e4 LT |
514 | ln->parent = pn; |
515 | ln->fn_sernum = sernum; | |
516 | ||
517 | if (dir) | |
518 | pn->right = ln; | |
519 | else | |
520 | pn->left = ln; | |
521 | ||
522 | return ln; | |
523 | ||
524 | ||
525 | insert_above: | |
526 | /* | |
1ab1457c | 527 | * split since we don't have a common prefix anymore or |
1da177e4 LT |
528 | * we have a less significant route. |
529 | * we've to insert an intermediate node on the list | |
530 | * this new node will point to the one we need to create | |
531 | * and the current | |
532 | */ | |
533 | ||
534 | pn = fn->parent; | |
535 | ||
536 | /* find 1st bit in difference between the 2 addrs. | |
537 | ||
971f359d | 538 | See comment in __ipv6_addr_diff: bit may be an invalid value, |
1da177e4 LT |
539 | but if it is >= plen, the value is ignored in any case. |
540 | */ | |
1ab1457c | 541 | |
9225b230 | 542 | bit = __ipv6_addr_diff(addr, &key->addr, sizeof(*addr)); |
1da177e4 | 543 | |
1ab1457c YH |
544 | /* |
545 | * (intermediate)[in] | |
1da177e4 LT |
546 | * / \ |
547 | * (new leaf node)[ln] (old node)[fn] | |
548 | */ | |
549 | if (plen > bit) { | |
550 | in = node_alloc(); | |
551 | ln = node_alloc(); | |
1ab1457c | 552 | |
507c9b1e | 553 | if (!in || !ln) { |
1da177e4 LT |
554 | if (in) |
555 | node_free(in); | |
556 | if (ln) | |
557 | node_free(ln); | |
188c517a | 558 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
559 | } |
560 | ||
1ab1457c YH |
561 | /* |
562 | * new intermediate node. | |
1da177e4 LT |
563 | * RTN_RTINFO will |
564 | * be off since that an address that chooses one of | |
565 | * the branches would not match less specific routes | |
566 | * in the other branch | |
567 | */ | |
568 | ||
569 | in->fn_bit = bit; | |
570 | ||
571 | in->parent = pn; | |
572 | in->leaf = fn->leaf; | |
573 | atomic_inc(&in->leaf->rt6i_ref); | |
574 | ||
575 | in->fn_sernum = sernum; | |
576 | ||
577 | /* update parent pointer */ | |
578 | if (dir) | |
579 | pn->right = in; | |
580 | else | |
581 | pn->left = in; | |
582 | ||
583 | ln->fn_bit = plen; | |
584 | ||
585 | ln->parent = in; | |
586 | fn->parent = in; | |
587 | ||
588 | ln->fn_sernum = sernum; | |
589 | ||
590 | if (addr_bit_set(addr, bit)) { | |
591 | in->right = ln; | |
592 | in->left = fn; | |
593 | } else { | |
594 | in->left = ln; | |
595 | in->right = fn; | |
596 | } | |
597 | } else { /* plen <= bit */ | |
598 | ||
1ab1457c | 599 | /* |
1da177e4 LT |
600 | * (new leaf node)[ln] |
601 | * / \ | |
602 | * (old node)[fn] NULL | |
603 | */ | |
604 | ||
605 | ln = node_alloc(); | |
606 | ||
507c9b1e | 607 | if (!ln) |
188c517a | 608 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
609 | |
610 | ln->fn_bit = plen; | |
611 | ||
612 | ln->parent = pn; | |
613 | ||
614 | ln->fn_sernum = sernum; | |
1ab1457c | 615 | |
1da177e4 LT |
616 | if (dir) |
617 | pn->right = ln; | |
618 | else | |
619 | pn->left = ln; | |
620 | ||
621 | if (addr_bit_set(&key->addr, plen)) | |
622 | ln->right = fn; | |
623 | else | |
624 | ln->left = fn; | |
625 | ||
626 | fn->parent = ln; | |
627 | } | |
628 | return ln; | |
629 | } | |
630 | ||
307f2fb9 HFS |
631 | static inline bool rt6_qualify_for_ecmp(struct rt6_info *rt) |
632 | { | |
633 | return (rt->rt6i_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) == | |
634 | RTF_GATEWAY; | |
635 | } | |
636 | ||
e5fd387a MK |
637 | static int fib6_commit_metrics(struct dst_entry *dst, |
638 | struct nlattr *mx, int mx_len) | |
639 | { | |
640 | struct nlattr *nla; | |
641 | int remaining; | |
642 | u32 *mp; | |
643 | ||
644 | if (dst->flags & DST_HOST) { | |
645 | mp = dst_metrics_write_ptr(dst); | |
646 | } else { | |
647 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL); | |
648 | if (!mp) | |
649 | return -ENOMEM; | |
650 | dst_init_metrics(dst, mp, 0); | |
651 | } | |
652 | ||
653 | nla_for_each_attr(nla, mx, mx_len, remaining) { | |
654 | int type = nla_type(nla); | |
655 | ||
656 | if (type) { | |
657 | if (type > RTAX_MAX) | |
658 | return -EINVAL; | |
659 | ||
660 | mp[type - 1] = nla_get_u32(nla); | |
661 | } | |
662 | } | |
663 | return 0; | |
664 | } | |
665 | ||
1da177e4 LT |
666 | /* |
667 | * Insert routing information in a node. | |
668 | */ | |
669 | ||
670 | static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt, | |
e5fd387a | 671 | struct nl_info *info, struct nlattr *mx, int mx_len) |
1da177e4 LT |
672 | { |
673 | struct rt6_info *iter = NULL; | |
674 | struct rt6_info **ins; | |
507c9b1e DM |
675 | int replace = (info->nlh && |
676 | (info->nlh->nlmsg_flags & NLM_F_REPLACE)); | |
677 | int add = (!info->nlh || | |
678 | (info->nlh->nlmsg_flags & NLM_F_CREATE)); | |
4a287eba | 679 | int found = 0; |
307f2fb9 | 680 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); |
e5fd387a | 681 | int err; |
1da177e4 LT |
682 | |
683 | ins = &fn->leaf; | |
684 | ||
507c9b1e | 685 | for (iter = fn->leaf; iter; iter = iter->dst.rt6_next) { |
1da177e4 LT |
686 | /* |
687 | * Search for duplicates | |
688 | */ | |
689 | ||
690 | if (iter->rt6i_metric == rt->rt6i_metric) { | |
691 | /* | |
692 | * Same priority level | |
693 | */ | |
507c9b1e DM |
694 | if (info->nlh && |
695 | (info->nlh->nlmsg_flags & NLM_F_EXCL)) | |
4a287eba MV |
696 | return -EEXIST; |
697 | if (replace) { | |
698 | found++; | |
699 | break; | |
700 | } | |
1da177e4 | 701 | |
d1918542 | 702 | if (iter->dst.dev == rt->dst.dev && |
1da177e4 LT |
703 | iter->rt6i_idev == rt->rt6i_idev && |
704 | ipv6_addr_equal(&iter->rt6i_gateway, | |
705 | &rt->rt6i_gateway)) { | |
51ebd318 ND |
706 | if (rt->rt6i_nsiblings) |
707 | rt->rt6i_nsiblings = 0; | |
507c9b1e | 708 | if (!(iter->rt6i_flags & RTF_EXPIRES)) |
1da177e4 | 709 | return -EEXIST; |
1716a961 G |
710 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
711 | rt6_clean_expires(iter); | |
712 | else | |
713 | rt6_set_expires(iter, rt->dst.expires); | |
1da177e4 LT |
714 | return -EEXIST; |
715 | } | |
51ebd318 ND |
716 | /* If we have the same destination and the same metric, |
717 | * but not the same gateway, then the route we try to | |
718 | * add is sibling to this route, increment our counter | |
719 | * of siblings, and later we will add our route to the | |
720 | * list. | |
721 | * Only static routes (which don't have flag | |
722 | * RTF_EXPIRES) are used for ECMPv6. | |
723 | * | |
724 | * To avoid long list, we only had siblings if the | |
725 | * route have a gateway. | |
726 | */ | |
307f2fb9 HFS |
727 | if (rt_can_ecmp && |
728 | rt6_qualify_for_ecmp(iter)) | |
51ebd318 | 729 | rt->rt6i_nsiblings++; |
1da177e4 LT |
730 | } |
731 | ||
732 | if (iter->rt6i_metric > rt->rt6i_metric) | |
733 | break; | |
734 | ||
d8d1f30b | 735 | ins = &iter->dst.rt6_next; |
1da177e4 LT |
736 | } |
737 | ||
f11e6659 DM |
738 | /* Reset round-robin state, if necessary */ |
739 | if (ins == &fn->leaf) | |
740 | fn->rr_ptr = NULL; | |
741 | ||
51ebd318 ND |
742 | /* Link this route to others same route. */ |
743 | if (rt->rt6i_nsiblings) { | |
744 | unsigned int rt6i_nsiblings; | |
745 | struct rt6_info *sibling, *temp_sibling; | |
746 | ||
747 | /* Find the first route that have the same metric */ | |
748 | sibling = fn->leaf; | |
749 | while (sibling) { | |
307f2fb9 HFS |
750 | if (sibling->rt6i_metric == rt->rt6i_metric && |
751 | rt6_qualify_for_ecmp(sibling)) { | |
51ebd318 ND |
752 | list_add_tail(&rt->rt6i_siblings, |
753 | &sibling->rt6i_siblings); | |
754 | break; | |
755 | } | |
756 | sibling = sibling->dst.rt6_next; | |
757 | } | |
758 | /* For each sibling in the list, increment the counter of | |
759 | * siblings. BUG() if counters does not match, list of siblings | |
760 | * is broken! | |
761 | */ | |
762 | rt6i_nsiblings = 0; | |
763 | list_for_each_entry_safe(sibling, temp_sibling, | |
764 | &rt->rt6i_siblings, rt6i_siblings) { | |
765 | sibling->rt6i_nsiblings++; | |
766 | BUG_ON(sibling->rt6i_nsiblings != rt->rt6i_nsiblings); | |
767 | rt6i_nsiblings++; | |
768 | } | |
769 | BUG_ON(rt6i_nsiblings != rt->rt6i_nsiblings); | |
770 | } | |
771 | ||
1da177e4 LT |
772 | /* |
773 | * insert node | |
774 | */ | |
4a287eba MV |
775 | if (!replace) { |
776 | if (!add) | |
f3213831 | 777 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba MV |
778 | |
779 | add: | |
e5fd387a MK |
780 | if (mx) { |
781 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
782 | if (err) | |
783 | return err; | |
784 | } | |
4a287eba MV |
785 | rt->dst.rt6_next = iter; |
786 | *ins = rt; | |
787 | rt->rt6i_node = fn; | |
788 | atomic_inc(&rt->rt6i_ref); | |
789 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
790 | info->nl_net->ipv6.rt6_stats->fib_rt_entries++; | |
791 | ||
507c9b1e | 792 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
793 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
794 | fn->fn_flags |= RTN_RTINFO; | |
795 | } | |
1da177e4 | 796 | |
4a287eba MV |
797 | } else { |
798 | if (!found) { | |
799 | if (add) | |
800 | goto add; | |
f3213831 | 801 | pr_warn("NLM_F_REPLACE set, but no existing node found!\n"); |
4a287eba MV |
802 | return -ENOENT; |
803 | } | |
e5fd387a MK |
804 | if (mx) { |
805 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
806 | if (err) | |
807 | return err; | |
808 | } | |
4a287eba MV |
809 | *ins = rt; |
810 | rt->rt6i_node = fn; | |
811 | rt->dst.rt6_next = iter->dst.rt6_next; | |
812 | atomic_inc(&rt->rt6i_ref); | |
813 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
814 | rt6_release(iter); | |
507c9b1e | 815 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
816 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
817 | fn->fn_flags |= RTN_RTINFO; | |
818 | } | |
1da177e4 LT |
819 | } |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
63152fc0 | 824 | static __inline__ void fib6_start_gc(struct net *net, struct rt6_info *rt) |
1da177e4 | 825 | { |
417f28bb | 826 | if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
507c9b1e | 827 | (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE))) |
417f28bb | 828 | mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce | 829 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
830 | } |
831 | ||
63152fc0 | 832 | void fib6_force_start_gc(struct net *net) |
1da177e4 | 833 | { |
417f28bb SH |
834 | if (!timer_pending(&net->ipv6.ip6_fib_timer)) |
835 | mod_timer(&net->ipv6.ip6_fib_timer, | |
847499ce | 836 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
837 | } |
838 | ||
839 | /* | |
840 | * Add routing information to the routing tree. | |
841 | * <destination addr>/<source addr> | |
842 | * with source addr info in sub-trees | |
843 | */ | |
844 | ||
e5fd387a MK |
845 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info, |
846 | struct nlattr *mx, int mx_len) | |
1da177e4 | 847 | { |
66729e18 | 848 | struct fib6_node *fn, *pn = NULL; |
1da177e4 | 849 | int err = -ENOMEM; |
4a287eba MV |
850 | int allow_create = 1; |
851 | int replace_required = 0; | |
507c9b1e DM |
852 | |
853 | if (info->nlh) { | |
854 | if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) | |
4a287eba | 855 | allow_create = 0; |
507c9b1e | 856 | if (info->nlh->nlmsg_flags & NLM_F_REPLACE) |
4a287eba MV |
857 | replace_required = 1; |
858 | } | |
859 | if (!allow_create && !replace_required) | |
f3213831 | 860 | pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n"); |
1da177e4 | 861 | |
9225b230 | 862 | fn = fib6_add_1(root, &rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
863 | offsetof(struct rt6_info, rt6i_dst), allow_create, | |
864 | replace_required); | |
4a287eba MV |
865 | if (IS_ERR(fn)) { |
866 | err = PTR_ERR(fn); | |
ae7b4e1f | 867 | fn = NULL; |
1da177e4 | 868 | goto out; |
188c517a | 869 | } |
1da177e4 | 870 | |
66729e18 YH |
871 | pn = fn; |
872 | ||
1da177e4 LT |
873 | #ifdef CONFIG_IPV6_SUBTREES |
874 | if (rt->rt6i_src.plen) { | |
875 | struct fib6_node *sn; | |
876 | ||
507c9b1e | 877 | if (!fn->subtree) { |
1da177e4 LT |
878 | struct fib6_node *sfn; |
879 | ||
880 | /* | |
881 | * Create subtree. | |
882 | * | |
883 | * fn[main tree] | |
884 | * | | |
885 | * sfn[subtree root] | |
886 | * \ | |
887 | * sn[new leaf node] | |
888 | */ | |
889 | ||
890 | /* Create subtree root node */ | |
891 | sfn = node_alloc(); | |
507c9b1e | 892 | if (!sfn) |
1da177e4 LT |
893 | goto st_failure; |
894 | ||
8ed67789 DL |
895 | sfn->leaf = info->nl_net->ipv6.ip6_null_entry; |
896 | atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref); | |
1da177e4 LT |
897 | sfn->fn_flags = RTN_ROOT; |
898 | sfn->fn_sernum = fib6_new_sernum(); | |
899 | ||
900 | /* Now add the first leaf node to new subtree */ | |
901 | ||
902 | sn = fib6_add_1(sfn, &rt->rt6i_src.addr, | |
9225b230 | 903 | rt->rt6i_src.plen, |
4a287eba MV |
904 | offsetof(struct rt6_info, rt6i_src), |
905 | allow_create, replace_required); | |
1da177e4 | 906 | |
f950c0ec | 907 | if (IS_ERR(sn)) { |
1da177e4 LT |
908 | /* If it is failed, discard just allocated |
909 | root, and then (in st_failure) stale node | |
910 | in main tree. | |
911 | */ | |
912 | node_free(sfn); | |
188c517a | 913 | err = PTR_ERR(sn); |
1da177e4 LT |
914 | goto st_failure; |
915 | } | |
916 | ||
917 | /* Now link new subtree to main tree */ | |
918 | sfn->parent = fn; | |
919 | fn->subtree = sfn; | |
1da177e4 LT |
920 | } else { |
921 | sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr, | |
9225b230 | 922 | rt->rt6i_src.plen, |
4a287eba MV |
923 | offsetof(struct rt6_info, rt6i_src), |
924 | allow_create, replace_required); | |
1da177e4 | 925 | |
4a287eba MV |
926 | if (IS_ERR(sn)) { |
927 | err = PTR_ERR(sn); | |
1da177e4 | 928 | goto st_failure; |
188c517a | 929 | } |
1da177e4 LT |
930 | } |
931 | ||
507c9b1e | 932 | if (!fn->leaf) { |
66729e18 YH |
933 | fn->leaf = rt; |
934 | atomic_inc(&rt->rt6i_ref); | |
935 | } | |
1da177e4 LT |
936 | fn = sn; |
937 | } | |
938 | #endif | |
939 | ||
e5fd387a | 940 | err = fib6_add_rt2node(fn, rt, info, mx, mx_len); |
507c9b1e | 941 | if (!err) { |
63152fc0 | 942 | fib6_start_gc(info->nl_net, rt); |
507c9b1e | 943 | if (!(rt->rt6i_flags & RTF_CACHE)) |
ec7d43c2 | 944 | fib6_prune_clones(info->nl_net, pn, rt); |
1da177e4 LT |
945 | } |
946 | ||
947 | out: | |
66729e18 YH |
948 | if (err) { |
949 | #ifdef CONFIG_IPV6_SUBTREES | |
950 | /* | |
951 | * If fib6_add_1 has cleared the old leaf pointer in the | |
952 | * super-tree leaf node we have to find a new one for it. | |
953 | */ | |
3c051235 DM |
954 | if (pn != fn && pn->leaf == rt) { |
955 | pn->leaf = NULL; | |
956 | atomic_dec(&rt->rt6i_ref); | |
957 | } | |
66729e18 | 958 | if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) { |
8ed67789 | 959 | pn->leaf = fib6_find_prefix(info->nl_net, pn); |
66729e18 YH |
960 | #if RT6_DEBUG >= 2 |
961 | if (!pn->leaf) { | |
547b792c | 962 | WARN_ON(pn->leaf == NULL); |
8ed67789 | 963 | pn->leaf = info->nl_net->ipv6.ip6_null_entry; |
66729e18 YH |
964 | } |
965 | #endif | |
966 | atomic_inc(&pn->leaf->rt6i_ref); | |
967 | } | |
968 | #endif | |
d8d1f30b | 969 | dst_free(&rt->dst); |
66729e18 | 970 | } |
1da177e4 LT |
971 | return err; |
972 | ||
973 | #ifdef CONFIG_IPV6_SUBTREES | |
974 | /* Subtree creation failed, probably main tree node | |
975 | is orphan. If it is, shoot it. | |
976 | */ | |
977 | st_failure: | |
978 | if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT))) | |
8ed67789 | 979 | fib6_repair_tree(info->nl_net, fn); |
d8d1f30b | 980 | dst_free(&rt->dst); |
1da177e4 LT |
981 | return err; |
982 | #endif | |
983 | } | |
984 | ||
985 | /* | |
986 | * Routing tree lookup | |
987 | * | |
988 | */ | |
989 | ||
990 | struct lookup_args { | |
507c9b1e | 991 | int offset; /* key offset on rt6_info */ |
b71d1d42 | 992 | const struct in6_addr *addr; /* search key */ |
1da177e4 LT |
993 | }; |
994 | ||
437de07c WY |
995 | static struct fib6_node *fib6_lookup_1(struct fib6_node *root, |
996 | struct lookup_args *args) | |
1da177e4 LT |
997 | { |
998 | struct fib6_node *fn; | |
e69a4adc | 999 | __be32 dir; |
1da177e4 | 1000 | |
825e288e YH |
1001 | if (unlikely(args->offset == 0)) |
1002 | return NULL; | |
1003 | ||
1da177e4 LT |
1004 | /* |
1005 | * Descend on a tree | |
1006 | */ | |
1007 | ||
1008 | fn = root; | |
1009 | ||
1010 | for (;;) { | |
1011 | struct fib6_node *next; | |
1012 | ||
1013 | dir = addr_bit_set(args->addr, fn->fn_bit); | |
1014 | ||
1015 | next = dir ? fn->right : fn->left; | |
1016 | ||
1017 | if (next) { | |
1018 | fn = next; | |
1019 | continue; | |
1020 | } | |
1da177e4 LT |
1021 | break; |
1022 | } | |
1023 | ||
507c9b1e | 1024 | while (fn) { |
7fc33165 | 1025 | if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) { |
1da177e4 LT |
1026 | struct rt6key *key; |
1027 | ||
1028 | key = (struct rt6key *) ((u8 *) fn->leaf + | |
1029 | args->offset); | |
1030 | ||
3fc5e044 YH |
1031 | if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { |
1032 | #ifdef CONFIG_IPV6_SUBTREES | |
3e3be275 HFS |
1033 | if (fn->subtree) { |
1034 | struct fib6_node *sfn; | |
1035 | sfn = fib6_lookup_1(fn->subtree, | |
1036 | args + 1); | |
1037 | if (!sfn) | |
1038 | goto backtrack; | |
1039 | fn = sfn; | |
1040 | } | |
3fc5e044 | 1041 | #endif |
3e3be275 | 1042 | if (fn->fn_flags & RTN_RTINFO) |
3fc5e044 YH |
1043 | return fn; |
1044 | } | |
1da177e4 | 1045 | } |
3e3be275 HFS |
1046 | #ifdef CONFIG_IPV6_SUBTREES |
1047 | backtrack: | |
1048 | #endif | |
3fc5e044 YH |
1049 | if (fn->fn_flags & RTN_ROOT) |
1050 | break; | |
1051 | ||
1da177e4 LT |
1052 | fn = fn->parent; |
1053 | } | |
1054 | ||
1055 | return NULL; | |
1056 | } | |
1057 | ||
437de07c WY |
1058 | struct fib6_node *fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr, |
1059 | const struct in6_addr *saddr) | |
1da177e4 | 1060 | { |
1da177e4 | 1061 | struct fib6_node *fn; |
825e288e YH |
1062 | struct lookup_args args[] = { |
1063 | { | |
1064 | .offset = offsetof(struct rt6_info, rt6i_dst), | |
1065 | .addr = daddr, | |
1066 | }, | |
1da177e4 | 1067 | #ifdef CONFIG_IPV6_SUBTREES |
825e288e YH |
1068 | { |
1069 | .offset = offsetof(struct rt6_info, rt6i_src), | |
1070 | .addr = saddr, | |
1071 | }, | |
1da177e4 | 1072 | #endif |
825e288e YH |
1073 | { |
1074 | .offset = 0, /* sentinel */ | |
1075 | } | |
1076 | }; | |
1da177e4 | 1077 | |
fefc2a6c | 1078 | fn = fib6_lookup_1(root, daddr ? args : args + 1); |
507c9b1e | 1079 | if (!fn || fn->fn_flags & RTN_TL_ROOT) |
1da177e4 LT |
1080 | fn = root; |
1081 | ||
1082 | return fn; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Get node with specified destination prefix (and source prefix, | |
1087 | * if subtrees are used) | |
1088 | */ | |
1089 | ||
1090 | ||
437de07c WY |
1091 | static struct fib6_node *fib6_locate_1(struct fib6_node *root, |
1092 | const struct in6_addr *addr, | |
1093 | int plen, int offset) | |
1da177e4 LT |
1094 | { |
1095 | struct fib6_node *fn; | |
1096 | ||
1097 | for (fn = root; fn ; ) { | |
1098 | struct rt6key *key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
1099 | ||
1100 | /* | |
1101 | * Prefix match | |
1102 | */ | |
1103 | if (plen < fn->fn_bit || | |
1104 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) | |
1105 | return NULL; | |
1106 | ||
1107 | if (plen == fn->fn_bit) | |
1108 | return fn; | |
1109 | ||
1110 | /* | |
1111 | * We have more bits to go | |
1112 | */ | |
1113 | if (addr_bit_set(addr, fn->fn_bit)) | |
1114 | fn = fn->right; | |
1115 | else | |
1116 | fn = fn->left; | |
1117 | } | |
1118 | return NULL; | |
1119 | } | |
1120 | ||
437de07c WY |
1121 | struct fib6_node *fib6_locate(struct fib6_node *root, |
1122 | const struct in6_addr *daddr, int dst_len, | |
1123 | const struct in6_addr *saddr, int src_len) | |
1da177e4 LT |
1124 | { |
1125 | struct fib6_node *fn; | |
1126 | ||
1127 | fn = fib6_locate_1(root, daddr, dst_len, | |
1128 | offsetof(struct rt6_info, rt6i_dst)); | |
1129 | ||
1130 | #ifdef CONFIG_IPV6_SUBTREES | |
1131 | if (src_len) { | |
547b792c | 1132 | WARN_ON(saddr == NULL); |
3fc5e044 YH |
1133 | if (fn && fn->subtree) |
1134 | fn = fib6_locate_1(fn->subtree, saddr, src_len, | |
1da177e4 LT |
1135 | offsetof(struct rt6_info, rt6i_src)); |
1136 | } | |
1137 | #endif | |
1138 | ||
507c9b1e | 1139 | if (fn && fn->fn_flags & RTN_RTINFO) |
1da177e4 LT |
1140 | return fn; |
1141 | ||
1142 | return NULL; | |
1143 | } | |
1144 | ||
1145 | ||
1146 | /* | |
1147 | * Deletion | |
1148 | * | |
1149 | */ | |
1150 | ||
8ed67789 | 1151 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn) |
1da177e4 | 1152 | { |
507c9b1e | 1153 | if (fn->fn_flags & RTN_ROOT) |
8ed67789 | 1154 | return net->ipv6.ip6_null_entry; |
1da177e4 | 1155 | |
507c9b1e DM |
1156 | while (fn) { |
1157 | if (fn->left) | |
1da177e4 | 1158 | return fn->left->leaf; |
507c9b1e | 1159 | if (fn->right) |
1da177e4 LT |
1160 | return fn->right->leaf; |
1161 | ||
7fc33165 | 1162 | fn = FIB6_SUBTREE(fn); |
1da177e4 LT |
1163 | } |
1164 | return NULL; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Called to trim the tree of intermediate nodes when possible. "fn" | |
1169 | * is the node we want to try and remove. | |
1170 | */ | |
1171 | ||
8ed67789 DL |
1172 | static struct fib6_node *fib6_repair_tree(struct net *net, |
1173 | struct fib6_node *fn) | |
1da177e4 LT |
1174 | { |
1175 | int children; | |
1176 | int nstate; | |
1177 | struct fib6_node *child, *pn; | |
1178 | struct fib6_walker_t *w; | |
1179 | int iter = 0; | |
1180 | ||
1181 | for (;;) { | |
1182 | RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter); | |
1183 | iter++; | |
1184 | ||
547b792c IJ |
1185 | WARN_ON(fn->fn_flags & RTN_RTINFO); |
1186 | WARN_ON(fn->fn_flags & RTN_TL_ROOT); | |
1187 | WARN_ON(fn->leaf != NULL); | |
1da177e4 LT |
1188 | |
1189 | children = 0; | |
1190 | child = NULL; | |
49e253e3 WY |
1191 | if (fn->right) |
1192 | child = fn->right, children |= 1; | |
1193 | if (fn->left) | |
1194 | child = fn->left, children |= 2; | |
1da177e4 | 1195 | |
7fc33165 | 1196 | if (children == 3 || FIB6_SUBTREE(fn) |
1da177e4 LT |
1197 | #ifdef CONFIG_IPV6_SUBTREES |
1198 | /* Subtree root (i.e. fn) may have one child */ | |
507c9b1e | 1199 | || (children && fn->fn_flags & RTN_ROOT) |
1da177e4 LT |
1200 | #endif |
1201 | ) { | |
8ed67789 | 1202 | fn->leaf = fib6_find_prefix(net, fn); |
1da177e4 | 1203 | #if RT6_DEBUG >= 2 |
507c9b1e | 1204 | if (!fn->leaf) { |
547b792c | 1205 | WARN_ON(!fn->leaf); |
8ed67789 | 1206 | fn->leaf = net->ipv6.ip6_null_entry; |
1da177e4 LT |
1207 | } |
1208 | #endif | |
1209 | atomic_inc(&fn->leaf->rt6i_ref); | |
1210 | return fn->parent; | |
1211 | } | |
1212 | ||
1213 | pn = fn->parent; | |
1214 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1215 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1216 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
7fc33165 | 1217 | FIB6_SUBTREE(pn) = NULL; |
1da177e4 LT |
1218 | nstate = FWS_L; |
1219 | } else { | |
547b792c | 1220 | WARN_ON(fn->fn_flags & RTN_ROOT); |
1da177e4 | 1221 | #endif |
49e253e3 WY |
1222 | if (pn->right == fn) |
1223 | pn->right = child; | |
1224 | else if (pn->left == fn) | |
1225 | pn->left = child; | |
1da177e4 | 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); | |
8db46f1d | 1257 | w->state = w->state >= FWS_R ? FWS_U : FWS_INIT; |
1da177e4 LT |
1258 | } else { |
1259 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
8db46f1d | 1260 | w->state = w->state >= FWS_C ? FWS_U : FWS_INIT; |
1da177e4 LT |
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 | |
8db46f1d | 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--; | |
1c265854 | 1462 | goto skip; |
2bec5a36 PM |
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 | } | |
1c265854 | 1472 | skip: |
1da177e4 LT |
1473 | w->state = FWS_U; |
1474 | case FWS_U: | |
1475 | if (fn == w->root) | |
1476 | return 0; | |
1477 | pn = fn->parent; | |
1478 | w->node = pn; | |
1479 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1480 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1481 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
1da177e4 LT |
1482 | w->state = FWS_L; |
1483 | continue; | |
1484 | } | |
1485 | #endif | |
1486 | if (pn->left == fn) { | |
1487 | w->state = FWS_R; | |
1488 | continue; | |
1489 | } | |
1490 | if (pn->right == fn) { | |
1491 | w->state = FWS_C; | |
1492 | w->leaf = w->node->leaf; | |
1493 | continue; | |
1494 | } | |
1495 | #if RT6_DEBUG >= 2 | |
547b792c | 1496 | WARN_ON(1); |
1da177e4 LT |
1497 | #endif |
1498 | } | |
1499 | } | |
1500 | } | |
1501 | ||
90d41122 | 1502 | static int fib6_walk(struct fib6_walker_t *w) |
1da177e4 LT |
1503 | { |
1504 | int res; | |
1505 | ||
1506 | w->state = FWS_INIT; | |
1507 | w->node = w->root; | |
1508 | ||
1509 | fib6_walker_link(w); | |
1510 | res = fib6_walk_continue(w); | |
1511 | if (res <= 0) | |
1512 | fib6_walker_unlink(w); | |
1513 | return res; | |
1514 | } | |
1515 | ||
1516 | static int fib6_clean_node(struct fib6_walker_t *w) | |
1517 | { | |
1518 | int res; | |
1519 | struct rt6_info *rt; | |
0a8891a0 | 1520 | struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w); |
ec7d43c2 BT |
1521 | struct nl_info info = { |
1522 | .nl_net = c->net, | |
1523 | }; | |
1da177e4 | 1524 | |
d8d1f30b | 1525 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 LT |
1526 | res = c->func(rt, c->arg); |
1527 | if (res < 0) { | |
1528 | w->leaf = rt; | |
528c4ceb | 1529 | res = fib6_del(rt, &info); |
1da177e4 LT |
1530 | if (res) { |
1531 | #if RT6_DEBUG >= 2 | |
91df42be JP |
1532 | pr_debug("%s: del failed: rt=%p@%p err=%d\n", |
1533 | __func__, rt, rt->rt6i_node, res); | |
1da177e4 LT |
1534 | #endif |
1535 | continue; | |
1536 | } | |
1537 | return 0; | |
1538 | } | |
547b792c | 1539 | WARN_ON(res != 0); |
1da177e4 LT |
1540 | } |
1541 | w->leaf = rt; | |
1542 | return 0; | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * Convenient frontend to tree walker. | |
1ab1457c | 1547 | * |
1da177e4 LT |
1548 | * func is called on each route. |
1549 | * It may return -1 -> delete this route. | |
1550 | * 0 -> continue walking | |
1551 | * | |
1552 | * prune==1 -> only immediate children of node (certainly, | |
1553 | * ignoring pure split nodes) will be scanned. | |
1554 | */ | |
1555 | ||
ec7d43c2 | 1556 | static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
8ce11e6a AB |
1557 | int (*func)(struct rt6_info *, void *arg), |
1558 | int prune, void *arg) | |
1da177e4 LT |
1559 | { |
1560 | struct fib6_cleaner_t c; | |
1561 | ||
1562 | c.w.root = root; | |
1563 | c.w.func = fib6_clean_node; | |
1564 | c.w.prune = prune; | |
2bec5a36 PM |
1565 | c.w.count = 0; |
1566 | c.w.skip = 0; | |
1da177e4 LT |
1567 | c.func = func; |
1568 | c.arg = arg; | |
ec7d43c2 | 1569 | c.net = net; |
1da177e4 LT |
1570 | |
1571 | fib6_walk(&c.w); | |
1572 | } | |
1573 | ||
f3db4851 | 1574 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg), |
0c3584d5 | 1575 | void *arg) |
c71099ac | 1576 | { |
c71099ac | 1577 | struct fib6_table *table; |
58f09b78 | 1578 | struct hlist_head *head; |
1b43af54 | 1579 | unsigned int h; |
c71099ac | 1580 | |
1b43af54 | 1581 | rcu_read_lock(); |
a33bc5c1 | 1582 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
f3db4851 | 1583 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 1584 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { |
c71099ac | 1585 | write_lock_bh(&table->tb6_lock); |
ec7d43c2 | 1586 | fib6_clean_tree(net, &table->tb6_root, |
0c3584d5 | 1587 | func, 0, arg); |
c71099ac TG |
1588 | write_unlock_bh(&table->tb6_lock); |
1589 | } | |
1590 | } | |
1b43af54 | 1591 | rcu_read_unlock(); |
c71099ac TG |
1592 | } |
1593 | ||
1da177e4 LT |
1594 | static int fib6_prune_clone(struct rt6_info *rt, void *arg) |
1595 | { | |
1596 | if (rt->rt6i_flags & RTF_CACHE) { | |
1597 | RT6_TRACE("pruning clone %p\n", rt); | |
1598 | return -1; | |
1599 | } | |
1600 | ||
1601 | return 0; | |
1602 | } | |
1603 | ||
ec7d43c2 BT |
1604 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn, |
1605 | struct rt6_info *rt) | |
1da177e4 | 1606 | { |
ec7d43c2 | 1607 | fib6_clean_tree(net, fn, fib6_prune_clone, 1, rt); |
1da177e4 LT |
1608 | } |
1609 | ||
1610 | /* | |
1611 | * Garbage collection | |
1612 | */ | |
1613 | ||
1614 | static struct fib6_gc_args | |
1615 | { | |
1616 | int timeout; | |
1617 | int more; | |
1618 | } gc_args; | |
1619 | ||
1620 | static int fib6_age(struct rt6_info *rt, void *arg) | |
1621 | { | |
1622 | unsigned long now = jiffies; | |
1623 | ||
1624 | /* | |
1625 | * check addrconf expiration here. | |
1626 | * Routes are expired even if they are in use. | |
1627 | * | |
1628 | * Also age clones. Note, that clones are aged out | |
1629 | * only if they are not in use now. | |
1630 | */ | |
1631 | ||
d1918542 DM |
1632 | if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) { |
1633 | if (time_after(now, rt->dst.expires)) { | |
1da177e4 | 1634 | RT6_TRACE("expiring %p\n", rt); |
1da177e4 LT |
1635 | return -1; |
1636 | } | |
1637 | gc_args.more++; | |
1638 | } else if (rt->rt6i_flags & RTF_CACHE) { | |
d8d1f30b CG |
1639 | if (atomic_read(&rt->dst.__refcnt) == 0 && |
1640 | time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) { | |
1da177e4 LT |
1641 | RT6_TRACE("aging clone %p\n", rt); |
1642 | return -1; | |
5339ab8b DM |
1643 | } else if (rt->rt6i_flags & RTF_GATEWAY) { |
1644 | struct neighbour *neigh; | |
1645 | __u8 neigh_flags = 0; | |
1646 | ||
1647 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
1648 | if (neigh) { | |
1649 | neigh_flags = neigh->flags; | |
1650 | neigh_release(neigh); | |
1651 | } | |
8bd74516 | 1652 | if (!(neigh_flags & NTF_ROUTER)) { |
5339ab8b DM |
1653 | RT6_TRACE("purging route %p via non-router but gateway\n", |
1654 | rt); | |
1655 | return -1; | |
1656 | } | |
1da177e4 LT |
1657 | } |
1658 | gc_args.more++; | |
1659 | } | |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
1664 | static DEFINE_SPINLOCK(fib6_gc_lock); | |
1665 | ||
2ac3ac8f | 1666 | void fib6_run_gc(unsigned long expires, struct net *net, bool force) |
1da177e4 | 1667 | { |
49a18d86 MK |
1668 | unsigned long now; |
1669 | ||
2ac3ac8f | 1670 | if (force) { |
1da177e4 | 1671 | spin_lock_bh(&fib6_gc_lock); |
2ac3ac8f MK |
1672 | } else if (!spin_trylock_bh(&fib6_gc_lock)) { |
1673 | mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); | |
1674 | return; | |
1da177e4 | 1675 | } |
2ac3ac8f MK |
1676 | gc_args.timeout = expires ? (int)expires : |
1677 | net->ipv6.sysctl.ip6_rt_gc_interval; | |
1da177e4 | 1678 | |
3d0f24a7 | 1679 | gc_args.more = icmp6_dst_gc(); |
f3db4851 | 1680 | |
0c3584d5 | 1681 | fib6_clean_all(net, fib6_age, NULL); |
49a18d86 MK |
1682 | now = jiffies; |
1683 | net->ipv6.ip6_rt_last_gc = now; | |
1da177e4 LT |
1684 | |
1685 | if (gc_args.more) | |
c8a45222 | 1686 | mod_timer(&net->ipv6.ip6_fib_timer, |
49a18d86 | 1687 | round_jiffies(now |
c8a45222 | 1688 | + net->ipv6.sysctl.ip6_rt_gc_interval)); |
417f28bb SH |
1689 | else |
1690 | del_timer(&net->ipv6.ip6_fib_timer); | |
1da177e4 LT |
1691 | spin_unlock_bh(&fib6_gc_lock); |
1692 | } | |
1693 | ||
5b7c931d DL |
1694 | static void fib6_gc_timer_cb(unsigned long arg) |
1695 | { | |
2ac3ac8f | 1696 | fib6_run_gc(0, (struct net *)arg, true); |
5b7c931d DL |
1697 | } |
1698 | ||
2c8c1e72 | 1699 | static int __net_init fib6_net_init(struct net *net) |
1da177e4 | 1700 | { |
10da66f7 ED |
1701 | size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
1702 | ||
417f28bb | 1703 | setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); |
63152fc0 | 1704 | |
c572872f BT |
1705 | net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); |
1706 | if (!net->ipv6.rt6_stats) | |
1707 | goto out_timer; | |
1708 | ||
10da66f7 ED |
1709 | /* Avoid false sharing : Use at least a full cache line */ |
1710 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1711 | ||
1712 | net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); | |
58f09b78 | 1713 | if (!net->ipv6.fib_table_hash) |
c572872f | 1714 | goto out_rt6_stats; |
e0b85590 | 1715 | |
58f09b78 DL |
1716 | net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), |
1717 | GFP_KERNEL); | |
1718 | if (!net->ipv6.fib6_main_tbl) | |
e0b85590 DL |
1719 | goto out_fib_table_hash; |
1720 | ||
58f09b78 | 1721 | net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
8ed67789 | 1722 | net->ipv6.fib6_main_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1723 | net->ipv6.fib6_main_tbl->tb6_root.fn_flags = |
1724 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1725 | inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers); |
e0b85590 DL |
1726 | |
1727 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
58f09b78 DL |
1728 | net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), |
1729 | GFP_KERNEL); | |
1730 | if (!net->ipv6.fib6_local_tbl) | |
e0b85590 | 1731 | goto out_fib6_main_tbl; |
58f09b78 | 1732 | net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
8ed67789 | 1733 | net->ipv6.fib6_local_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1734 | net->ipv6.fib6_local_tbl->tb6_root.fn_flags = |
1735 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1736 | inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers); |
e0b85590 | 1737 | #endif |
58f09b78 | 1738 | fib6_tables_init(net); |
f845ab6b | 1739 | |
417f28bb | 1740 | return 0; |
d63bddbe | 1741 | |
e0b85590 | 1742 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 1743 | out_fib6_main_tbl: |
58f09b78 | 1744 | kfree(net->ipv6.fib6_main_tbl); |
e0b85590 | 1745 | #endif |
e0b85590 | 1746 | out_fib_table_hash: |
58f09b78 | 1747 | kfree(net->ipv6.fib_table_hash); |
c572872f BT |
1748 | out_rt6_stats: |
1749 | kfree(net->ipv6.rt6_stats); | |
63152fc0 | 1750 | out_timer: |
417f28bb | 1751 | return -ENOMEM; |
8db46f1d | 1752 | } |
58f09b78 DL |
1753 | |
1754 | static void fib6_net_exit(struct net *net) | |
1755 | { | |
8ed67789 | 1756 | rt6_ifdown(net, NULL); |
417f28bb SH |
1757 | del_timer_sync(&net->ipv6.ip6_fib_timer); |
1758 | ||
58f09b78 | 1759 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
8e773277 | 1760 | inetpeer_invalidate_tree(&net->ipv6.fib6_local_tbl->tb6_peers); |
58f09b78 DL |
1761 | kfree(net->ipv6.fib6_local_tbl); |
1762 | #endif | |
8e773277 | 1763 | inetpeer_invalidate_tree(&net->ipv6.fib6_main_tbl->tb6_peers); |
58f09b78 DL |
1764 | kfree(net->ipv6.fib6_main_tbl); |
1765 | kfree(net->ipv6.fib_table_hash); | |
c572872f | 1766 | kfree(net->ipv6.rt6_stats); |
58f09b78 DL |
1767 | } |
1768 | ||
1769 | static struct pernet_operations fib6_net_ops = { | |
1770 | .init = fib6_net_init, | |
1771 | .exit = fib6_net_exit, | |
1772 | }; | |
1773 | ||
1774 | int __init fib6_init(void) | |
1775 | { | |
1776 | int ret = -ENOMEM; | |
63152fc0 | 1777 | |
58f09b78 DL |
1778 | fib6_node_kmem = kmem_cache_create("fib6_nodes", |
1779 | sizeof(struct fib6_node), | |
1780 | 0, SLAB_HWCACHE_ALIGN, | |
1781 | NULL); | |
1782 | if (!fib6_node_kmem) | |
1783 | goto out; | |
1784 | ||
1785 | ret = register_pernet_subsys(&fib6_net_ops); | |
1786 | if (ret) | |
c572872f | 1787 | goto out_kmem_cache_create; |
e8803b6c DM |
1788 | |
1789 | ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib, | |
1790 | NULL); | |
1791 | if (ret) | |
1792 | goto out_unregister_subsys; | |
58f09b78 DL |
1793 | out: |
1794 | return ret; | |
1795 | ||
e8803b6c DM |
1796 | out_unregister_subsys: |
1797 | unregister_pernet_subsys(&fib6_net_ops); | |
d63bddbe DL |
1798 | out_kmem_cache_create: |
1799 | kmem_cache_destroy(fib6_node_kmem); | |
1800 | goto out; | |
1da177e4 LT |
1801 | } |
1802 | ||
1803 | void fib6_gc_cleanup(void) | |
1804 | { | |
58f09b78 | 1805 | unregister_pernet_subsys(&fib6_net_ops); |
1da177e4 LT |
1806 | kmem_cache_destroy(fib6_node_kmem); |
1807 | } | |
8d2ca1d7 HFS |
1808 | |
1809 | #ifdef CONFIG_PROC_FS | |
1810 | ||
1811 | struct ipv6_route_iter { | |
1812 | struct seq_net_private p; | |
1813 | struct fib6_walker_t w; | |
1814 | loff_t skip; | |
1815 | struct fib6_table *tbl; | |
0a67d3ef | 1816 | __u32 sernum; |
8d2ca1d7 HFS |
1817 | }; |
1818 | ||
1819 | static int ipv6_route_seq_show(struct seq_file *seq, void *v) | |
1820 | { | |
1821 | struct rt6_info *rt = v; | |
1822 | struct ipv6_route_iter *iter = seq->private; | |
1823 | ||
1824 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); | |
1825 | ||
1826 | #ifdef CONFIG_IPV6_SUBTREES | |
1827 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); | |
1828 | #else | |
1829 | seq_puts(seq, "00000000000000000000000000000000 00 "); | |
1830 | #endif | |
1831 | if (rt->rt6i_flags & RTF_GATEWAY) | |
1832 | seq_printf(seq, "%pi6", &rt->rt6i_gateway); | |
1833 | else | |
1834 | seq_puts(seq, "00000000000000000000000000000000"); | |
1835 | ||
1836 | seq_printf(seq, " %08x %08x %08x %08x %8s\n", | |
1837 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), | |
1838 | rt->dst.__use, rt->rt6i_flags, | |
1839 | rt->dst.dev ? rt->dst.dev->name : ""); | |
1840 | iter->w.leaf = NULL; | |
1841 | return 0; | |
1842 | } | |
1843 | ||
1844 | static int ipv6_route_yield(struct fib6_walker_t *w) | |
1845 | { | |
1846 | struct ipv6_route_iter *iter = w->args; | |
1847 | ||
1848 | if (!iter->skip) | |
1849 | return 1; | |
1850 | ||
1851 | do { | |
1852 | iter->w.leaf = iter->w.leaf->dst.rt6_next; | |
1853 | iter->skip--; | |
1854 | if (!iter->skip && iter->w.leaf) | |
1855 | return 1; | |
1856 | } while (iter->w.leaf); | |
1857 | ||
1858 | return 0; | |
1859 | } | |
1860 | ||
1861 | static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter) | |
1862 | { | |
1863 | memset(&iter->w, 0, sizeof(iter->w)); | |
1864 | iter->w.func = ipv6_route_yield; | |
1865 | iter->w.root = &iter->tbl->tb6_root; | |
1866 | iter->w.state = FWS_INIT; | |
1867 | iter->w.node = iter->w.root; | |
1868 | iter->w.args = iter; | |
0a67d3ef | 1869 | iter->sernum = iter->w.root->fn_sernum; |
8d2ca1d7 HFS |
1870 | INIT_LIST_HEAD(&iter->w.lh); |
1871 | fib6_walker_link(&iter->w); | |
1872 | } | |
1873 | ||
1874 | static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl, | |
1875 | struct net *net) | |
1876 | { | |
1877 | unsigned int h; | |
1878 | struct hlist_node *node; | |
1879 | ||
1880 | if (tbl) { | |
1881 | h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1; | |
1882 | node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist)); | |
1883 | } else { | |
1884 | h = 0; | |
1885 | node = NULL; | |
1886 | } | |
1887 | ||
1888 | while (!node && h < FIB6_TABLE_HASHSZ) { | |
1889 | node = rcu_dereference_bh( | |
1890 | hlist_first_rcu(&net->ipv6.fib_table_hash[h++])); | |
1891 | } | |
1892 | return hlist_entry_safe(node, struct fib6_table, tb6_hlist); | |
1893 | } | |
1894 | ||
0a67d3ef HFS |
1895 | static void ipv6_route_check_sernum(struct ipv6_route_iter *iter) |
1896 | { | |
1897 | if (iter->sernum != iter->w.root->fn_sernum) { | |
1898 | iter->sernum = iter->w.root->fn_sernum; | |
1899 | iter->w.state = FWS_INIT; | |
1900 | iter->w.node = iter->w.root; | |
1901 | WARN_ON(iter->w.skip); | |
1902 | iter->w.skip = iter->w.count; | |
1903 | } | |
1904 | } | |
1905 | ||
8d2ca1d7 HFS |
1906 | static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1907 | { | |
1908 | int r; | |
1909 | struct rt6_info *n; | |
1910 | struct net *net = seq_file_net(seq); | |
1911 | struct ipv6_route_iter *iter = seq->private; | |
1912 | ||
1913 | if (!v) | |
1914 | goto iter_table; | |
1915 | ||
1916 | n = ((struct rt6_info *)v)->dst.rt6_next; | |
1917 | if (n) { | |
1918 | ++*pos; | |
1919 | return n; | |
1920 | } | |
1921 | ||
1922 | iter_table: | |
0a67d3ef | 1923 | ipv6_route_check_sernum(iter); |
8d2ca1d7 HFS |
1924 | read_lock(&iter->tbl->tb6_lock); |
1925 | r = fib6_walk_continue(&iter->w); | |
1926 | read_unlock(&iter->tbl->tb6_lock); | |
1927 | if (r > 0) { | |
1928 | if (v) | |
1929 | ++*pos; | |
1930 | return iter->w.leaf; | |
1931 | } else if (r < 0) { | |
1932 | fib6_walker_unlink(&iter->w); | |
1933 | return NULL; | |
1934 | } | |
1935 | fib6_walker_unlink(&iter->w); | |
1936 | ||
1937 | iter->tbl = ipv6_route_seq_next_table(iter->tbl, net); | |
1938 | if (!iter->tbl) | |
1939 | return NULL; | |
1940 | ||
1941 | ipv6_route_seq_setup_walk(iter); | |
1942 | goto iter_table; | |
1943 | } | |
1944 | ||
1945 | static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos) | |
1946 | __acquires(RCU_BH) | |
1947 | { | |
1948 | struct net *net = seq_file_net(seq); | |
1949 | struct ipv6_route_iter *iter = seq->private; | |
1950 | ||
1951 | rcu_read_lock_bh(); | |
1952 | iter->tbl = ipv6_route_seq_next_table(NULL, net); | |
1953 | iter->skip = *pos; | |
1954 | ||
1955 | if (iter->tbl) { | |
1956 | ipv6_route_seq_setup_walk(iter); | |
1957 | return ipv6_route_seq_next(seq, NULL, pos); | |
1958 | } else { | |
1959 | return NULL; | |
1960 | } | |
1961 | } | |
1962 | ||
1963 | static bool ipv6_route_iter_active(struct ipv6_route_iter *iter) | |
1964 | { | |
1965 | struct fib6_walker_t *w = &iter->w; | |
1966 | return w->node && !(w->state == FWS_U && w->node == w->root); | |
1967 | } | |
1968 | ||
1969 | static void ipv6_route_seq_stop(struct seq_file *seq, void *v) | |
1970 | __releases(RCU_BH) | |
1971 | { | |
1972 | struct ipv6_route_iter *iter = seq->private; | |
1973 | ||
1974 | if (ipv6_route_iter_active(iter)) | |
1975 | fib6_walker_unlink(&iter->w); | |
1976 | ||
1977 | rcu_read_unlock_bh(); | |
1978 | } | |
1979 | ||
1980 | static const struct seq_operations ipv6_route_seq_ops = { | |
1981 | .start = ipv6_route_seq_start, | |
1982 | .next = ipv6_route_seq_next, | |
1983 | .stop = ipv6_route_seq_stop, | |
1984 | .show = ipv6_route_seq_show | |
1985 | }; | |
1986 | ||
1987 | int ipv6_route_open(struct inode *inode, struct file *file) | |
1988 | { | |
1989 | return seq_open_net(inode, file, &ipv6_route_seq_ops, | |
1990 | sizeof(struct ipv6_route_iter)); | |
1991 | } | |
1992 | ||
1993 | #endif /* CONFIG_PROC_FS */ |