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 | |
94b2cfe0 HFS |
49 | struct fib6_cleaner { |
50 | struct fib6_walker w; | |
ec7d43c2 | 51 | struct net *net; |
1da177e4 | 52 | int (*func)(struct rt6_info *, void *arg); |
327571cb | 53 | int sernum; |
1da177e4 LT |
54 | void *arg; |
55 | }; | |
56 | ||
90d41122 | 57 | static DEFINE_RWLOCK(fib6_walker_lock); |
1da177e4 LT |
58 | |
59 | #ifdef CONFIG_IPV6_SUBTREES | |
60 | #define FWS_INIT FWS_S | |
1da177e4 LT |
61 | #else |
62 | #define FWS_INIT FWS_L | |
1da177e4 LT |
63 | #endif |
64 | ||
163cd4e8 | 65 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn); |
8ed67789 DL |
66 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn); |
67 | static struct fib6_node *fib6_repair_tree(struct net *net, struct fib6_node *fn); | |
94b2cfe0 HFS |
68 | static int fib6_walk(struct fib6_walker *w); |
69 | static int fib6_walk_continue(struct fib6_walker *w); | |
1da177e4 LT |
70 | |
71 | /* | |
72 | * A routing update causes an increase of the serial number on the | |
73 | * affected subtree. This allows for cached routes to be asynchronously | |
74 | * tested when modifications are made to the destination cache as a | |
75 | * result of redirects, path MTU changes, etc. | |
76 | */ | |
77 | ||
5b7c931d DL |
78 | static void fib6_gc_timer_cb(unsigned long arg); |
79 | ||
bbef49da AD |
80 | static LIST_HEAD(fib6_walkers); |
81 | #define FOR_WALKERS(w) list_for_each_entry(w, &fib6_walkers, lh) | |
1da177e4 | 82 | |
94b2cfe0 | 83 | static void fib6_walker_link(struct fib6_walker *w) |
90d41122 AB |
84 | { |
85 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 86 | list_add(&w->lh, &fib6_walkers); |
90d41122 AB |
87 | write_unlock_bh(&fib6_walker_lock); |
88 | } | |
89 | ||
94b2cfe0 | 90 | static void fib6_walker_unlink(struct fib6_walker *w) |
90d41122 AB |
91 | { |
92 | write_lock_bh(&fib6_walker_lock); | |
bbef49da | 93 | list_del(&w->lh); |
90d41122 AB |
94 | write_unlock_bh(&fib6_walker_lock); |
95 | } | |
94b2cfe0 | 96 | |
812918c4 | 97 | static int fib6_new_sernum(struct net *net) |
1da177e4 | 98 | { |
42b18706 HFS |
99 | int new, old; |
100 | ||
101 | do { | |
812918c4 | 102 | old = atomic_read(&net->ipv6.fib6_sernum); |
42b18706 | 103 | new = old < INT_MAX ? old + 1 : 1; |
812918c4 HFS |
104 | } while (atomic_cmpxchg(&net->ipv6.fib6_sernum, |
105 | old, new) != old); | |
42b18706 | 106 | return new; |
1da177e4 LT |
107 | } |
108 | ||
327571cb HFS |
109 | enum { |
110 | FIB6_NO_SERNUM_CHANGE = 0, | |
111 | }; | |
112 | ||
1da177e4 LT |
113 | /* |
114 | * Auxiliary address test functions for the radix tree. | |
115 | * | |
1ab1457c | 116 | * These assume a 32bit processor (although it will work on |
1da177e4 LT |
117 | * 64bit processors) |
118 | */ | |
119 | ||
120 | /* | |
121 | * test bit | |
122 | */ | |
02cdce53 YH |
123 | #if defined(__LITTLE_ENDIAN) |
124 | # define BITOP_BE32_SWIZZLE (0x1F & ~7) | |
125 | #else | |
126 | # define BITOP_BE32_SWIZZLE 0 | |
127 | #endif | |
1da177e4 | 128 | |
94b2cfe0 | 129 | static __be32 addr_bit_set(const void *token, int fn_bit) |
1da177e4 | 130 | { |
b71d1d42 | 131 | const __be32 *addr = token; |
02cdce53 YH |
132 | /* |
133 | * Here, | |
8db46f1d | 134 | * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) |
02cdce53 YH |
135 | * is optimized version of |
136 | * htonl(1 << ((~fn_bit)&0x1F)) | |
137 | * See include/asm-generic/bitops/le.h. | |
138 | */ | |
0eae88f3 ED |
139 | return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & |
140 | addr[fn_bit >> 5]; | |
1da177e4 LT |
141 | } |
142 | ||
94b2cfe0 | 143 | static struct fib6_node *node_alloc(void) |
1da177e4 LT |
144 | { |
145 | struct fib6_node *fn; | |
146 | ||
c3762229 | 147 | fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
1da177e4 LT |
148 | |
149 | return fn; | |
150 | } | |
151 | ||
94b2cfe0 | 152 | static void node_free(struct fib6_node *fn) |
1da177e4 LT |
153 | { |
154 | kmem_cache_free(fib6_node_kmem, fn); | |
155 | } | |
156 | ||
94b2cfe0 | 157 | static void rt6_release(struct rt6_info *rt) |
1da177e4 LT |
158 | { |
159 | if (atomic_dec_and_test(&rt->rt6i_ref)) | |
d8d1f30b | 160 | dst_free(&rt->dst); |
1da177e4 LT |
161 | } |
162 | ||
58f09b78 | 163 | static void fib6_link_table(struct net *net, struct fib6_table *tb) |
1b43af54 PM |
164 | { |
165 | unsigned int h; | |
166 | ||
375216ad TG |
167 | /* |
168 | * Initialize table lock at a single place to give lockdep a key, | |
169 | * tables aren't visible prior to being linked to the list. | |
170 | */ | |
171 | rwlock_init(&tb->tb6_lock); | |
172 | ||
a33bc5c1 | 173 | h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
1b43af54 PM |
174 | |
175 | /* | |
176 | * No protection necessary, this is the only list mutatation | |
177 | * operation, tables never disappear once they exist. | |
178 | */ | |
58f09b78 | 179 | hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
1b43af54 | 180 | } |
c71099ac | 181 | |
1b43af54 | 182 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 183 | |
8ed67789 | 184 | static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
c71099ac TG |
185 | { |
186 | struct fib6_table *table; | |
187 | ||
188 | table = kzalloc(sizeof(*table), GFP_ATOMIC); | |
507c9b1e | 189 | if (table) { |
c71099ac | 190 | table->tb6_id = id; |
8ed67789 | 191 | table->tb6_root.leaf = net->ipv6.ip6_null_entry; |
c71099ac | 192 | table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
8e773277 | 193 | inet_peer_base_init(&table->tb6_peers); |
c71099ac TG |
194 | } |
195 | ||
196 | return table; | |
197 | } | |
198 | ||
58f09b78 | 199 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac TG |
200 | { |
201 | struct fib6_table *tb; | |
202 | ||
203 | if (id == 0) | |
204 | id = RT6_TABLE_MAIN; | |
58f09b78 | 205 | tb = fib6_get_table(net, id); |
c71099ac TG |
206 | if (tb) |
207 | return tb; | |
208 | ||
8ed67789 | 209 | tb = fib6_alloc_table(net, id); |
507c9b1e | 210 | if (tb) |
58f09b78 | 211 | fib6_link_table(net, tb); |
c71099ac TG |
212 | |
213 | return tb; | |
214 | } | |
215 | ||
58f09b78 | 216 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac TG |
217 | { |
218 | struct fib6_table *tb; | |
58f09b78 | 219 | struct hlist_head *head; |
c71099ac TG |
220 | unsigned int h; |
221 | ||
222 | if (id == 0) | |
223 | id = RT6_TABLE_MAIN; | |
a33bc5c1 | 224 | h = id & (FIB6_TABLE_HASHSZ - 1); |
c71099ac | 225 | rcu_read_lock(); |
58f09b78 | 226 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 227 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
c71099ac TG |
228 | if (tb->tb6_id == id) { |
229 | rcu_read_unlock(); | |
230 | return tb; | |
231 | } | |
232 | } | |
233 | rcu_read_unlock(); | |
234 | ||
235 | return NULL; | |
236 | } | |
237 | ||
2c8c1e72 | 238 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 239 | { |
58f09b78 DL |
240 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
241 | fib6_link_table(net, net->ipv6.fib6_local_tbl); | |
c71099ac | 242 | } |
c71099ac TG |
243 | #else |
244 | ||
58f09b78 | 245 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac | 246 | { |
58f09b78 | 247 | return fib6_get_table(net, id); |
c71099ac TG |
248 | } |
249 | ||
58f09b78 | 250 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac | 251 | { |
58f09b78 | 252 | return net->ipv6.fib6_main_tbl; |
c71099ac TG |
253 | } |
254 | ||
4c9483b2 | 255 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
58f09b78 | 256 | int flags, pol_lookup_t lookup) |
c71099ac | 257 | { |
4c9483b2 | 258 | return (struct dst_entry *) lookup(net, net->ipv6.fib6_main_tbl, fl6, flags); |
c71099ac TG |
259 | } |
260 | ||
2c8c1e72 | 261 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 262 | { |
58f09b78 | 263 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
c71099ac TG |
264 | } |
265 | ||
266 | #endif | |
267 | ||
94b2cfe0 | 268 | static int fib6_dump_node(struct fib6_walker *w) |
1b43af54 PM |
269 | { |
270 | int res; | |
271 | struct rt6_info *rt; | |
272 | ||
d8d1f30b | 273 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1b43af54 PM |
274 | res = rt6_dump_route(rt, w->args); |
275 | if (res < 0) { | |
276 | /* Frame is full, suspend walking */ | |
277 | w->leaf = rt; | |
278 | return 1; | |
279 | } | |
547b792c | 280 | WARN_ON(res == 0); |
1b43af54 PM |
281 | } |
282 | w->leaf = NULL; | |
283 | return 0; | |
284 | } | |
285 | ||
286 | static void fib6_dump_end(struct netlink_callback *cb) | |
287 | { | |
94b2cfe0 | 288 | struct fib6_walker *w = (void *)cb->args[2]; |
1b43af54 PM |
289 | |
290 | if (w) { | |
7891cc81 HX |
291 | if (cb->args[4]) { |
292 | cb->args[4] = 0; | |
293 | fib6_walker_unlink(w); | |
294 | } | |
1b43af54 PM |
295 | cb->args[2] = 0; |
296 | kfree(w); | |
297 | } | |
437de07c | 298 | cb->done = (void *)cb->args[3]; |
1b43af54 PM |
299 | cb->args[1] = 3; |
300 | } | |
301 | ||
302 | static int fib6_dump_done(struct netlink_callback *cb) | |
303 | { | |
304 | fib6_dump_end(cb); | |
305 | return cb->done ? cb->done(cb) : 0; | |
306 | } | |
307 | ||
308 | static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, | |
309 | struct netlink_callback *cb) | |
310 | { | |
94b2cfe0 | 311 | struct fib6_walker *w; |
1b43af54 PM |
312 | int res; |
313 | ||
314 | w = (void *)cb->args[2]; | |
315 | w->root = &table->tb6_root; | |
316 | ||
317 | if (cb->args[4] == 0) { | |
2bec5a36 PM |
318 | w->count = 0; |
319 | w->skip = 0; | |
320 | ||
1b43af54 PM |
321 | read_lock_bh(&table->tb6_lock); |
322 | res = fib6_walk(w); | |
323 | read_unlock_bh(&table->tb6_lock); | |
2bec5a36 | 324 | if (res > 0) { |
1b43af54 | 325 | cb->args[4] = 1; |
2bec5a36 PM |
326 | cb->args[5] = w->root->fn_sernum; |
327 | } | |
1b43af54 | 328 | } else { |
2bec5a36 PM |
329 | if (cb->args[5] != w->root->fn_sernum) { |
330 | /* Begin at the root if the tree changed */ | |
331 | cb->args[5] = w->root->fn_sernum; | |
332 | w->state = FWS_INIT; | |
333 | w->node = w->root; | |
334 | w->skip = w->count; | |
335 | } else | |
336 | w->skip = 0; | |
337 | ||
1b43af54 PM |
338 | read_lock_bh(&table->tb6_lock); |
339 | res = fib6_walk_continue(w); | |
340 | read_unlock_bh(&table->tb6_lock); | |
7891cc81 HX |
341 | if (res <= 0) { |
342 | fib6_walker_unlink(w); | |
343 | cb->args[4] = 0; | |
1b43af54 | 344 | } |
1b43af54 | 345 | } |
7891cc81 | 346 | |
1b43af54 PM |
347 | return res; |
348 | } | |
349 | ||
c127ea2c | 350 | static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1b43af54 | 351 | { |
3b1e0a65 | 352 | struct net *net = sock_net(skb->sk); |
1b43af54 PM |
353 | unsigned int h, s_h; |
354 | unsigned int e = 0, s_e; | |
355 | struct rt6_rtnl_dump_arg arg; | |
94b2cfe0 | 356 | struct fib6_walker *w; |
1b43af54 | 357 | struct fib6_table *tb; |
58f09b78 | 358 | struct hlist_head *head; |
1b43af54 PM |
359 | int res = 0; |
360 | ||
361 | s_h = cb->args[0]; | |
362 | s_e = cb->args[1]; | |
363 | ||
364 | w = (void *)cb->args[2]; | |
507c9b1e | 365 | if (!w) { |
1b43af54 PM |
366 | /* New dump: |
367 | * | |
368 | * 1. hook callback destructor. | |
369 | */ | |
370 | cb->args[3] = (long)cb->done; | |
371 | cb->done = fib6_dump_done; | |
372 | ||
373 | /* | |
374 | * 2. allocate and initialize walker. | |
375 | */ | |
376 | w = kzalloc(sizeof(*w), GFP_ATOMIC); | |
507c9b1e | 377 | if (!w) |
1b43af54 PM |
378 | return -ENOMEM; |
379 | w->func = fib6_dump_node; | |
380 | cb->args[2] = (long)w; | |
381 | } | |
382 | ||
383 | arg.skb = skb; | |
384 | arg.cb = cb; | |
191cd582 | 385 | arg.net = net; |
1b43af54 PM |
386 | w->args = &arg; |
387 | ||
e67f88dd | 388 | rcu_read_lock(); |
a33bc5c1 | 389 | for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
1b43af54 | 390 | e = 0; |
58f09b78 | 391 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 392 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
1b43af54 PM |
393 | if (e < s_e) |
394 | goto next; | |
395 | res = fib6_dump_table(tb, skb, cb); | |
396 | if (res != 0) | |
397 | goto out; | |
398 | next: | |
399 | e++; | |
400 | } | |
401 | } | |
402 | out: | |
e67f88dd | 403 | rcu_read_unlock(); |
1b43af54 PM |
404 | cb->args[1] = e; |
405 | cb->args[0] = h; | |
406 | ||
407 | res = res < 0 ? res : skb->len; | |
408 | if (res <= 0) | |
409 | fib6_dump_end(cb); | |
410 | return res; | |
411 | } | |
1da177e4 LT |
412 | |
413 | /* | |
414 | * Routing Table | |
415 | * | |
416 | * return the appropriate node for a routing tree "add" operation | |
417 | * by either creating and inserting or by returning an existing | |
418 | * node. | |
419 | */ | |
420 | ||
9225b230 | 421 | static struct fib6_node *fib6_add_1(struct fib6_node *root, |
422 | struct in6_addr *addr, int plen, | |
4a287eba | 423 | int offset, int allow_create, |
c8c4d42a | 424 | int replace_required, int sernum) |
1da177e4 LT |
425 | { |
426 | struct fib6_node *fn, *in, *ln; | |
427 | struct fib6_node *pn = NULL; | |
428 | struct rt6key *key; | |
429 | int bit; | |
1ab1457c | 430 | __be32 dir = 0; |
1da177e4 LT |
431 | |
432 | RT6_TRACE("fib6_add_1\n"); | |
433 | ||
434 | /* insert node in tree */ | |
435 | ||
436 | fn = root; | |
437 | ||
438 | do { | |
439 | key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
440 | ||
441 | /* | |
442 | * Prefix match | |
443 | */ | |
444 | if (plen < fn->fn_bit || | |
4a287eba | 445 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { |
14df015b MV |
446 | if (!allow_create) { |
447 | if (replace_required) { | |
f3213831 | 448 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
449 | return ERR_PTR(-ENOENT); |
450 | } | |
f3213831 | 451 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
14df015b | 452 | } |
1da177e4 | 453 | goto insert_above; |
4a287eba | 454 | } |
1ab1457c | 455 | |
1da177e4 LT |
456 | /* |
457 | * Exact match ? | |
458 | */ | |
1ab1457c | 459 | |
1da177e4 LT |
460 | if (plen == fn->fn_bit) { |
461 | /* clean up an intermediate node */ | |
507c9b1e | 462 | if (!(fn->fn_flags & RTN_RTINFO)) { |
1da177e4 LT |
463 | rt6_release(fn->leaf); |
464 | fn->leaf = NULL; | |
465 | } | |
1ab1457c | 466 | |
1da177e4 | 467 | fn->fn_sernum = sernum; |
1ab1457c | 468 | |
1da177e4 LT |
469 | return fn; |
470 | } | |
471 | ||
472 | /* | |
473 | * We have more bits to go | |
474 | */ | |
1ab1457c | 475 | |
1da177e4 LT |
476 | /* Try to walk down on tree. */ |
477 | fn->fn_sernum = sernum; | |
478 | dir = addr_bit_set(addr, fn->fn_bit); | |
479 | pn = fn; | |
8db46f1d | 480 | fn = dir ? fn->right : fn->left; |
1da177e4 LT |
481 | } while (fn); |
482 | ||
14df015b | 483 | if (!allow_create) { |
4a287eba MV |
484 | /* We should not create new node because |
485 | * NLM_F_REPLACE was specified without NLM_F_CREATE | |
486 | * I assume it is safe to require NLM_F_CREATE when | |
487 | * REPLACE flag is used! Later we may want to remove the | |
488 | * check for replace_required, because according | |
489 | * to netlink specification, NLM_F_CREATE | |
490 | * MUST be specified if new route is created. | |
491 | * That would keep IPv6 consistent with IPv4 | |
492 | */ | |
14df015b | 493 | if (replace_required) { |
f3213831 | 494 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
495 | return ERR_PTR(-ENOENT); |
496 | } | |
f3213831 | 497 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba | 498 | } |
1da177e4 LT |
499 | /* |
500 | * We walked to the bottom of tree. | |
501 | * Create new leaf node without children. | |
502 | */ | |
503 | ||
504 | ln = node_alloc(); | |
505 | ||
507c9b1e | 506 | if (!ln) |
188c517a | 507 | return ERR_PTR(-ENOMEM); |
1da177e4 | 508 | ln->fn_bit = plen; |
1ab1457c | 509 | |
1da177e4 LT |
510 | ln->parent = pn; |
511 | ln->fn_sernum = sernum; | |
512 | ||
513 | if (dir) | |
514 | pn->right = ln; | |
515 | else | |
516 | pn->left = ln; | |
517 | ||
518 | return ln; | |
519 | ||
520 | ||
521 | insert_above: | |
522 | /* | |
1ab1457c | 523 | * split since we don't have a common prefix anymore or |
1da177e4 LT |
524 | * we have a less significant route. |
525 | * we've to insert an intermediate node on the list | |
526 | * this new node will point to the one we need to create | |
527 | * and the current | |
528 | */ | |
529 | ||
530 | pn = fn->parent; | |
531 | ||
532 | /* find 1st bit in difference between the 2 addrs. | |
533 | ||
971f359d | 534 | See comment in __ipv6_addr_diff: bit may be an invalid value, |
1da177e4 LT |
535 | but if it is >= plen, the value is ignored in any case. |
536 | */ | |
1ab1457c | 537 | |
9225b230 | 538 | bit = __ipv6_addr_diff(addr, &key->addr, sizeof(*addr)); |
1da177e4 | 539 | |
1ab1457c YH |
540 | /* |
541 | * (intermediate)[in] | |
1da177e4 LT |
542 | * / \ |
543 | * (new leaf node)[ln] (old node)[fn] | |
544 | */ | |
545 | if (plen > bit) { | |
546 | in = node_alloc(); | |
547 | ln = node_alloc(); | |
1ab1457c | 548 | |
507c9b1e | 549 | if (!in || !ln) { |
1da177e4 LT |
550 | if (in) |
551 | node_free(in); | |
552 | if (ln) | |
553 | node_free(ln); | |
188c517a | 554 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
555 | } |
556 | ||
1ab1457c YH |
557 | /* |
558 | * new intermediate node. | |
1da177e4 LT |
559 | * RTN_RTINFO will |
560 | * be off since that an address that chooses one of | |
561 | * the branches would not match less specific routes | |
562 | * in the other branch | |
563 | */ | |
564 | ||
565 | in->fn_bit = bit; | |
566 | ||
567 | in->parent = pn; | |
568 | in->leaf = fn->leaf; | |
569 | atomic_inc(&in->leaf->rt6i_ref); | |
570 | ||
571 | in->fn_sernum = sernum; | |
572 | ||
573 | /* update parent pointer */ | |
574 | if (dir) | |
575 | pn->right = in; | |
576 | else | |
577 | pn->left = in; | |
578 | ||
579 | ln->fn_bit = plen; | |
580 | ||
581 | ln->parent = in; | |
582 | fn->parent = in; | |
583 | ||
584 | ln->fn_sernum = sernum; | |
585 | ||
586 | if (addr_bit_set(addr, bit)) { | |
587 | in->right = ln; | |
588 | in->left = fn; | |
589 | } else { | |
590 | in->left = ln; | |
591 | in->right = fn; | |
592 | } | |
593 | } else { /* plen <= bit */ | |
594 | ||
1ab1457c | 595 | /* |
1da177e4 LT |
596 | * (new leaf node)[ln] |
597 | * / \ | |
598 | * (old node)[fn] NULL | |
599 | */ | |
600 | ||
601 | ln = node_alloc(); | |
602 | ||
507c9b1e | 603 | if (!ln) |
188c517a | 604 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
605 | |
606 | ln->fn_bit = plen; | |
607 | ||
608 | ln->parent = pn; | |
609 | ||
610 | ln->fn_sernum = sernum; | |
1ab1457c | 611 | |
1da177e4 LT |
612 | if (dir) |
613 | pn->right = ln; | |
614 | else | |
615 | pn->left = ln; | |
616 | ||
617 | if (addr_bit_set(&key->addr, plen)) | |
618 | ln->right = fn; | |
619 | else | |
620 | ln->left = fn; | |
621 | ||
622 | fn->parent = ln; | |
623 | } | |
624 | return ln; | |
625 | } | |
626 | ||
94b2cfe0 | 627 | static bool rt6_qualify_for_ecmp(struct rt6_info *rt) |
307f2fb9 HFS |
628 | { |
629 | return (rt->rt6i_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) == | |
630 | RTF_GATEWAY; | |
631 | } | |
632 | ||
e5fd387a MK |
633 | static int fib6_commit_metrics(struct dst_entry *dst, |
634 | struct nlattr *mx, int mx_len) | |
635 | { | |
636 | struct nlattr *nla; | |
637 | int remaining; | |
638 | u32 *mp; | |
639 | ||
640 | if (dst->flags & DST_HOST) { | |
641 | mp = dst_metrics_write_ptr(dst); | |
642 | } else { | |
793c3b40 | 643 | mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_ATOMIC); |
e5fd387a MK |
644 | if (!mp) |
645 | return -ENOMEM; | |
646 | dst_init_metrics(dst, mp, 0); | |
647 | } | |
648 | ||
649 | nla_for_each_attr(nla, mx, mx_len, remaining) { | |
650 | int type = nla_type(nla); | |
651 | ||
652 | if (type) { | |
653 | if (type > RTAX_MAX) | |
654 | return -EINVAL; | |
655 | ||
656 | mp[type - 1] = nla_get_u32(nla); | |
657 | } | |
658 | } | |
659 | return 0; | |
660 | } | |
661 | ||
1da177e4 LT |
662 | /* |
663 | * Insert routing information in a node. | |
664 | */ | |
665 | ||
666 | static int fib6_add_rt2node(struct fib6_node *fn, struct rt6_info *rt, | |
e5fd387a | 667 | struct nl_info *info, struct nlattr *mx, int mx_len) |
1da177e4 LT |
668 | { |
669 | struct rt6_info *iter = NULL; | |
670 | struct rt6_info **ins; | |
507c9b1e DM |
671 | int replace = (info->nlh && |
672 | (info->nlh->nlmsg_flags & NLM_F_REPLACE)); | |
673 | int add = (!info->nlh || | |
674 | (info->nlh->nlmsg_flags & NLM_F_CREATE)); | |
4a287eba | 675 | int found = 0; |
307f2fb9 | 676 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); |
e5fd387a | 677 | int err; |
1da177e4 LT |
678 | |
679 | ins = &fn->leaf; | |
680 | ||
507c9b1e | 681 | for (iter = fn->leaf; iter; iter = iter->dst.rt6_next) { |
1da177e4 LT |
682 | /* |
683 | * Search for duplicates | |
684 | */ | |
685 | ||
686 | if (iter->rt6i_metric == rt->rt6i_metric) { | |
687 | /* | |
688 | * Same priority level | |
689 | */ | |
507c9b1e DM |
690 | if (info->nlh && |
691 | (info->nlh->nlmsg_flags & NLM_F_EXCL)) | |
4a287eba MV |
692 | return -EEXIST; |
693 | if (replace) { | |
694 | found++; | |
695 | break; | |
696 | } | |
1da177e4 | 697 | |
d1918542 | 698 | if (iter->dst.dev == rt->dst.dev && |
1da177e4 LT |
699 | iter->rt6i_idev == rt->rt6i_idev && |
700 | ipv6_addr_equal(&iter->rt6i_gateway, | |
701 | &rt->rt6i_gateway)) { | |
51ebd318 ND |
702 | if (rt->rt6i_nsiblings) |
703 | rt->rt6i_nsiblings = 0; | |
507c9b1e | 704 | if (!(iter->rt6i_flags & RTF_EXPIRES)) |
1da177e4 | 705 | return -EEXIST; |
1716a961 G |
706 | if (!(rt->rt6i_flags & RTF_EXPIRES)) |
707 | rt6_clean_expires(iter); | |
708 | else | |
709 | rt6_set_expires(iter, rt->dst.expires); | |
1da177e4 LT |
710 | return -EEXIST; |
711 | } | |
51ebd318 ND |
712 | /* If we have the same destination and the same metric, |
713 | * but not the same gateway, then the route we try to | |
714 | * add is sibling to this route, increment our counter | |
715 | * of siblings, and later we will add our route to the | |
716 | * list. | |
717 | * Only static routes (which don't have flag | |
718 | * RTF_EXPIRES) are used for ECMPv6. | |
719 | * | |
720 | * To avoid long list, we only had siblings if the | |
721 | * route have a gateway. | |
722 | */ | |
307f2fb9 HFS |
723 | if (rt_can_ecmp && |
724 | rt6_qualify_for_ecmp(iter)) | |
51ebd318 | 725 | rt->rt6i_nsiblings++; |
1da177e4 LT |
726 | } |
727 | ||
728 | if (iter->rt6i_metric > rt->rt6i_metric) | |
729 | break; | |
730 | ||
d8d1f30b | 731 | ins = &iter->dst.rt6_next; |
1da177e4 LT |
732 | } |
733 | ||
f11e6659 DM |
734 | /* Reset round-robin state, if necessary */ |
735 | if (ins == &fn->leaf) | |
736 | fn->rr_ptr = NULL; | |
737 | ||
51ebd318 ND |
738 | /* Link this route to others same route. */ |
739 | if (rt->rt6i_nsiblings) { | |
740 | unsigned int rt6i_nsiblings; | |
741 | struct rt6_info *sibling, *temp_sibling; | |
742 | ||
743 | /* Find the first route that have the same metric */ | |
744 | sibling = fn->leaf; | |
745 | while (sibling) { | |
307f2fb9 HFS |
746 | if (sibling->rt6i_metric == rt->rt6i_metric && |
747 | rt6_qualify_for_ecmp(sibling)) { | |
51ebd318 ND |
748 | list_add_tail(&rt->rt6i_siblings, |
749 | &sibling->rt6i_siblings); | |
750 | break; | |
751 | } | |
752 | sibling = sibling->dst.rt6_next; | |
753 | } | |
754 | /* For each sibling in the list, increment the counter of | |
755 | * siblings. BUG() if counters does not match, list of siblings | |
756 | * is broken! | |
757 | */ | |
758 | rt6i_nsiblings = 0; | |
759 | list_for_each_entry_safe(sibling, temp_sibling, | |
760 | &rt->rt6i_siblings, rt6i_siblings) { | |
761 | sibling->rt6i_nsiblings++; | |
762 | BUG_ON(sibling->rt6i_nsiblings != rt->rt6i_nsiblings); | |
763 | rt6i_nsiblings++; | |
764 | } | |
765 | BUG_ON(rt6i_nsiblings != rt->rt6i_nsiblings); | |
766 | } | |
767 | ||
1da177e4 LT |
768 | /* |
769 | * insert node | |
770 | */ | |
4a287eba MV |
771 | if (!replace) { |
772 | if (!add) | |
f3213831 | 773 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba MV |
774 | |
775 | add: | |
e5fd387a MK |
776 | if (mx) { |
777 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
778 | if (err) | |
779 | return err; | |
780 | } | |
4a287eba MV |
781 | rt->dst.rt6_next = iter; |
782 | *ins = rt; | |
783 | rt->rt6i_node = fn; | |
784 | atomic_inc(&rt->rt6i_ref); | |
785 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
786 | info->nl_net->ipv6.rt6_stats->fib_rt_entries++; | |
787 | ||
507c9b1e | 788 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
789 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
790 | fn->fn_flags |= RTN_RTINFO; | |
791 | } | |
1da177e4 | 792 | |
4a287eba MV |
793 | } else { |
794 | if (!found) { | |
795 | if (add) | |
796 | goto add; | |
f3213831 | 797 | pr_warn("NLM_F_REPLACE set, but no existing node found!\n"); |
4a287eba MV |
798 | return -ENOENT; |
799 | } | |
e5fd387a MK |
800 | if (mx) { |
801 | err = fib6_commit_metrics(&rt->dst, mx, mx_len); | |
802 | if (err) | |
803 | return err; | |
804 | } | |
4a287eba MV |
805 | *ins = rt; |
806 | rt->rt6i_node = fn; | |
807 | rt->dst.rt6_next = iter->dst.rt6_next; | |
808 | atomic_inc(&rt->rt6i_ref); | |
809 | inet6_rt_notify(RTM_NEWROUTE, rt, info); | |
810 | rt6_release(iter); | |
507c9b1e | 811 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
812 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
813 | fn->fn_flags |= RTN_RTINFO; | |
814 | } | |
1da177e4 LT |
815 | } |
816 | ||
817 | return 0; | |
818 | } | |
819 | ||
94b2cfe0 | 820 | static void fib6_start_gc(struct net *net, struct rt6_info *rt) |
1da177e4 | 821 | { |
417f28bb | 822 | if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
507c9b1e | 823 | (rt->rt6i_flags & (RTF_EXPIRES | RTF_CACHE))) |
417f28bb | 824 | mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce | 825 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
826 | } |
827 | ||
63152fc0 | 828 | void fib6_force_start_gc(struct net *net) |
1da177e4 | 829 | { |
417f28bb SH |
830 | if (!timer_pending(&net->ipv6.ip6_fib_timer)) |
831 | mod_timer(&net->ipv6.ip6_fib_timer, | |
847499ce | 832 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
833 | } |
834 | ||
835 | /* | |
836 | * Add routing information to the routing tree. | |
837 | * <destination addr>/<source addr> | |
838 | * with source addr info in sub-trees | |
839 | */ | |
840 | ||
e5fd387a MK |
841 | int fib6_add(struct fib6_node *root, struct rt6_info *rt, struct nl_info *info, |
842 | struct nlattr *mx, int mx_len) | |
1da177e4 | 843 | { |
66729e18 | 844 | struct fib6_node *fn, *pn = NULL; |
1da177e4 | 845 | int err = -ENOMEM; |
4a287eba MV |
846 | int allow_create = 1; |
847 | int replace_required = 0; | |
812918c4 | 848 | int sernum = fib6_new_sernum(info->nl_net); |
507c9b1e DM |
849 | |
850 | if (info->nlh) { | |
851 | if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) | |
4a287eba | 852 | allow_create = 0; |
507c9b1e | 853 | if (info->nlh->nlmsg_flags & NLM_F_REPLACE) |
4a287eba MV |
854 | replace_required = 1; |
855 | } | |
856 | if (!allow_create && !replace_required) | |
f3213831 | 857 | pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n"); |
1da177e4 | 858 | |
9225b230 | 859 | fn = fib6_add_1(root, &rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
860 | offsetof(struct rt6_info, rt6i_dst), allow_create, | |
c8c4d42a | 861 | replace_required, sernum); |
4a287eba MV |
862 | if (IS_ERR(fn)) { |
863 | err = PTR_ERR(fn); | |
ae7b4e1f | 864 | fn = NULL; |
1da177e4 | 865 | goto out; |
188c517a | 866 | } |
1da177e4 | 867 | |
66729e18 YH |
868 | pn = fn; |
869 | ||
1da177e4 LT |
870 | #ifdef CONFIG_IPV6_SUBTREES |
871 | if (rt->rt6i_src.plen) { | |
872 | struct fib6_node *sn; | |
873 | ||
507c9b1e | 874 | if (!fn->subtree) { |
1da177e4 LT |
875 | struct fib6_node *sfn; |
876 | ||
877 | /* | |
878 | * Create subtree. | |
879 | * | |
880 | * fn[main tree] | |
881 | * | | |
882 | * sfn[subtree root] | |
883 | * \ | |
884 | * sn[new leaf node] | |
885 | */ | |
886 | ||
887 | /* Create subtree root node */ | |
888 | sfn = node_alloc(); | |
507c9b1e | 889 | if (!sfn) |
1da177e4 LT |
890 | goto st_failure; |
891 | ||
8ed67789 DL |
892 | sfn->leaf = info->nl_net->ipv6.ip6_null_entry; |
893 | atomic_inc(&info->nl_net->ipv6.ip6_null_entry->rt6i_ref); | |
1da177e4 | 894 | sfn->fn_flags = RTN_ROOT; |
c8c4d42a | 895 | sfn->fn_sernum = sernum; |
1da177e4 LT |
896 | |
897 | /* Now add the first leaf node to new subtree */ | |
898 | ||
899 | sn = fib6_add_1(sfn, &rt->rt6i_src.addr, | |
9225b230 | 900 | rt->rt6i_src.plen, |
4a287eba | 901 | offsetof(struct rt6_info, rt6i_src), |
c8c4d42a | 902 | allow_create, replace_required, sernum); |
1da177e4 | 903 | |
f950c0ec | 904 | if (IS_ERR(sn)) { |
1da177e4 LT |
905 | /* If it is failed, discard just allocated |
906 | root, and then (in st_failure) stale node | |
907 | in main tree. | |
908 | */ | |
909 | node_free(sfn); | |
188c517a | 910 | err = PTR_ERR(sn); |
1da177e4 LT |
911 | goto st_failure; |
912 | } | |
913 | ||
914 | /* Now link new subtree to main tree */ | |
915 | sfn->parent = fn; | |
916 | fn->subtree = sfn; | |
1da177e4 LT |
917 | } else { |
918 | sn = fib6_add_1(fn->subtree, &rt->rt6i_src.addr, | |
9225b230 | 919 | rt->rt6i_src.plen, |
4a287eba | 920 | offsetof(struct rt6_info, rt6i_src), |
c8c4d42a | 921 | allow_create, replace_required, sernum); |
1da177e4 | 922 | |
4a287eba MV |
923 | if (IS_ERR(sn)) { |
924 | err = PTR_ERR(sn); | |
1da177e4 | 925 | goto st_failure; |
188c517a | 926 | } |
1da177e4 LT |
927 | } |
928 | ||
507c9b1e | 929 | if (!fn->leaf) { |
66729e18 YH |
930 | fn->leaf = rt; |
931 | atomic_inc(&rt->rt6i_ref); | |
932 | } | |
1da177e4 LT |
933 | fn = sn; |
934 | } | |
935 | #endif | |
936 | ||
e5fd387a | 937 | err = fib6_add_rt2node(fn, rt, info, mx, mx_len); |
507c9b1e | 938 | if (!err) { |
63152fc0 | 939 | fib6_start_gc(info->nl_net, rt); |
507c9b1e | 940 | if (!(rt->rt6i_flags & RTF_CACHE)) |
163cd4e8 | 941 | fib6_prune_clones(info->nl_net, pn); |
1da177e4 LT |
942 | } |
943 | ||
944 | out: | |
66729e18 YH |
945 | if (err) { |
946 | #ifdef CONFIG_IPV6_SUBTREES | |
947 | /* | |
948 | * If fib6_add_1 has cleared the old leaf pointer in the | |
949 | * super-tree leaf node we have to find a new one for it. | |
950 | */ | |
3c051235 DM |
951 | if (pn != fn && pn->leaf == rt) { |
952 | pn->leaf = NULL; | |
953 | atomic_dec(&rt->rt6i_ref); | |
954 | } | |
66729e18 | 955 | if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) { |
8ed67789 | 956 | pn->leaf = fib6_find_prefix(info->nl_net, pn); |
66729e18 YH |
957 | #if RT6_DEBUG >= 2 |
958 | if (!pn->leaf) { | |
547b792c | 959 | WARN_ON(pn->leaf == NULL); |
8ed67789 | 960 | pn->leaf = info->nl_net->ipv6.ip6_null_entry; |
66729e18 YH |
961 | } |
962 | #endif | |
963 | atomic_inc(&pn->leaf->rt6i_ref); | |
964 | } | |
965 | #endif | |
d8d1f30b | 966 | dst_free(&rt->dst); |
66729e18 | 967 | } |
1da177e4 LT |
968 | return err; |
969 | ||
970 | #ifdef CONFIG_IPV6_SUBTREES | |
971 | /* Subtree creation failed, probably main tree node | |
972 | is orphan. If it is, shoot it. | |
973 | */ | |
974 | st_failure: | |
975 | if (fn && !(fn->fn_flags & (RTN_RTINFO|RTN_ROOT))) | |
8ed67789 | 976 | fib6_repair_tree(info->nl_net, fn); |
d8d1f30b | 977 | dst_free(&rt->dst); |
1da177e4 LT |
978 | return err; |
979 | #endif | |
980 | } | |
981 | ||
982 | /* | |
983 | * Routing tree lookup | |
984 | * | |
985 | */ | |
986 | ||
987 | struct lookup_args { | |
507c9b1e | 988 | int offset; /* key offset on rt6_info */ |
b71d1d42 | 989 | const struct in6_addr *addr; /* search key */ |
1da177e4 LT |
990 | }; |
991 | ||
437de07c WY |
992 | static struct fib6_node *fib6_lookup_1(struct fib6_node *root, |
993 | struct lookup_args *args) | |
1da177e4 LT |
994 | { |
995 | struct fib6_node *fn; | |
e69a4adc | 996 | __be32 dir; |
1da177e4 | 997 | |
825e288e YH |
998 | if (unlikely(args->offset == 0)) |
999 | return NULL; | |
1000 | ||
1da177e4 LT |
1001 | /* |
1002 | * Descend on a tree | |
1003 | */ | |
1004 | ||
1005 | fn = root; | |
1006 | ||
1007 | for (;;) { | |
1008 | struct fib6_node *next; | |
1009 | ||
1010 | dir = addr_bit_set(args->addr, fn->fn_bit); | |
1011 | ||
1012 | next = dir ? fn->right : fn->left; | |
1013 | ||
1014 | if (next) { | |
1015 | fn = next; | |
1016 | continue; | |
1017 | } | |
1da177e4 LT |
1018 | break; |
1019 | } | |
1020 | ||
507c9b1e | 1021 | while (fn) { |
7fc33165 | 1022 | if (FIB6_SUBTREE(fn) || fn->fn_flags & RTN_RTINFO) { |
1da177e4 LT |
1023 | struct rt6key *key; |
1024 | ||
1025 | key = (struct rt6key *) ((u8 *) fn->leaf + | |
1026 | args->offset); | |
1027 | ||
3fc5e044 YH |
1028 | if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { |
1029 | #ifdef CONFIG_IPV6_SUBTREES | |
3e3be275 HFS |
1030 | if (fn->subtree) { |
1031 | struct fib6_node *sfn; | |
1032 | sfn = fib6_lookup_1(fn->subtree, | |
1033 | args + 1); | |
1034 | if (!sfn) | |
1035 | goto backtrack; | |
1036 | fn = sfn; | |
1037 | } | |
3fc5e044 | 1038 | #endif |
3e3be275 | 1039 | if (fn->fn_flags & RTN_RTINFO) |
3fc5e044 YH |
1040 | return fn; |
1041 | } | |
1da177e4 | 1042 | } |
3e3be275 HFS |
1043 | #ifdef CONFIG_IPV6_SUBTREES |
1044 | backtrack: | |
1045 | #endif | |
3fc5e044 YH |
1046 | if (fn->fn_flags & RTN_ROOT) |
1047 | break; | |
1048 | ||
1da177e4 LT |
1049 | fn = fn->parent; |
1050 | } | |
1051 | ||
1052 | return NULL; | |
1053 | } | |
1054 | ||
437de07c WY |
1055 | struct fib6_node *fib6_lookup(struct fib6_node *root, const struct in6_addr *daddr, |
1056 | const struct in6_addr *saddr) | |
1da177e4 | 1057 | { |
1da177e4 | 1058 | struct fib6_node *fn; |
825e288e YH |
1059 | struct lookup_args args[] = { |
1060 | { | |
1061 | .offset = offsetof(struct rt6_info, rt6i_dst), | |
1062 | .addr = daddr, | |
1063 | }, | |
1da177e4 | 1064 | #ifdef CONFIG_IPV6_SUBTREES |
825e288e YH |
1065 | { |
1066 | .offset = offsetof(struct rt6_info, rt6i_src), | |
1067 | .addr = saddr, | |
1068 | }, | |
1da177e4 | 1069 | #endif |
825e288e YH |
1070 | { |
1071 | .offset = 0, /* sentinel */ | |
1072 | } | |
1073 | }; | |
1da177e4 | 1074 | |
fefc2a6c | 1075 | fn = fib6_lookup_1(root, daddr ? args : args + 1); |
507c9b1e | 1076 | if (!fn || fn->fn_flags & RTN_TL_ROOT) |
1da177e4 LT |
1077 | fn = root; |
1078 | ||
1079 | return fn; | |
1080 | } | |
1081 | ||
1082 | /* | |
1083 | * Get node with specified destination prefix (and source prefix, | |
1084 | * if subtrees are used) | |
1085 | */ | |
1086 | ||
1087 | ||
437de07c WY |
1088 | static struct fib6_node *fib6_locate_1(struct fib6_node *root, |
1089 | const struct in6_addr *addr, | |
1090 | int plen, int offset) | |
1da177e4 LT |
1091 | { |
1092 | struct fib6_node *fn; | |
1093 | ||
1094 | for (fn = root; fn ; ) { | |
1095 | struct rt6key *key = (struct rt6key *)((u8 *)fn->leaf + offset); | |
1096 | ||
1097 | /* | |
1098 | * Prefix match | |
1099 | */ | |
1100 | if (plen < fn->fn_bit || | |
1101 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) | |
1102 | return NULL; | |
1103 | ||
1104 | if (plen == fn->fn_bit) | |
1105 | return fn; | |
1106 | ||
1107 | /* | |
1108 | * We have more bits to go | |
1109 | */ | |
1110 | if (addr_bit_set(addr, fn->fn_bit)) | |
1111 | fn = fn->right; | |
1112 | else | |
1113 | fn = fn->left; | |
1114 | } | |
1115 | return NULL; | |
1116 | } | |
1117 | ||
437de07c WY |
1118 | struct fib6_node *fib6_locate(struct fib6_node *root, |
1119 | const struct in6_addr *daddr, int dst_len, | |
1120 | const struct in6_addr *saddr, int src_len) | |
1da177e4 LT |
1121 | { |
1122 | struct fib6_node *fn; | |
1123 | ||
1124 | fn = fib6_locate_1(root, daddr, dst_len, | |
1125 | offsetof(struct rt6_info, rt6i_dst)); | |
1126 | ||
1127 | #ifdef CONFIG_IPV6_SUBTREES | |
1128 | if (src_len) { | |
547b792c | 1129 | WARN_ON(saddr == NULL); |
3fc5e044 YH |
1130 | if (fn && fn->subtree) |
1131 | fn = fib6_locate_1(fn->subtree, saddr, src_len, | |
1da177e4 LT |
1132 | offsetof(struct rt6_info, rt6i_src)); |
1133 | } | |
1134 | #endif | |
1135 | ||
507c9b1e | 1136 | if (fn && fn->fn_flags & RTN_RTINFO) |
1da177e4 LT |
1137 | return fn; |
1138 | ||
1139 | return NULL; | |
1140 | } | |
1141 | ||
1142 | ||
1143 | /* | |
1144 | * Deletion | |
1145 | * | |
1146 | */ | |
1147 | ||
8ed67789 | 1148 | static struct rt6_info *fib6_find_prefix(struct net *net, struct fib6_node *fn) |
1da177e4 | 1149 | { |
507c9b1e | 1150 | if (fn->fn_flags & RTN_ROOT) |
8ed67789 | 1151 | return net->ipv6.ip6_null_entry; |
1da177e4 | 1152 | |
507c9b1e DM |
1153 | while (fn) { |
1154 | if (fn->left) | |
1da177e4 | 1155 | return fn->left->leaf; |
507c9b1e | 1156 | if (fn->right) |
1da177e4 LT |
1157 | return fn->right->leaf; |
1158 | ||
7fc33165 | 1159 | fn = FIB6_SUBTREE(fn); |
1da177e4 LT |
1160 | } |
1161 | return NULL; | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Called to trim the tree of intermediate nodes when possible. "fn" | |
1166 | * is the node we want to try and remove. | |
1167 | */ | |
1168 | ||
8ed67789 DL |
1169 | static struct fib6_node *fib6_repair_tree(struct net *net, |
1170 | struct fib6_node *fn) | |
1da177e4 LT |
1171 | { |
1172 | int children; | |
1173 | int nstate; | |
1174 | struct fib6_node *child, *pn; | |
94b2cfe0 | 1175 | struct fib6_walker *w; |
1da177e4 LT |
1176 | int iter = 0; |
1177 | ||
1178 | for (;;) { | |
1179 | RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter); | |
1180 | iter++; | |
1181 | ||
547b792c IJ |
1182 | WARN_ON(fn->fn_flags & RTN_RTINFO); |
1183 | WARN_ON(fn->fn_flags & RTN_TL_ROOT); | |
1184 | WARN_ON(fn->leaf != NULL); | |
1da177e4 LT |
1185 | |
1186 | children = 0; | |
1187 | child = NULL; | |
49e253e3 WY |
1188 | if (fn->right) |
1189 | child = fn->right, children |= 1; | |
1190 | if (fn->left) | |
1191 | child = fn->left, children |= 2; | |
1da177e4 | 1192 | |
7fc33165 | 1193 | if (children == 3 || FIB6_SUBTREE(fn) |
1da177e4 LT |
1194 | #ifdef CONFIG_IPV6_SUBTREES |
1195 | /* Subtree root (i.e. fn) may have one child */ | |
507c9b1e | 1196 | || (children && fn->fn_flags & RTN_ROOT) |
1da177e4 LT |
1197 | #endif |
1198 | ) { | |
8ed67789 | 1199 | fn->leaf = fib6_find_prefix(net, fn); |
1da177e4 | 1200 | #if RT6_DEBUG >= 2 |
507c9b1e | 1201 | if (!fn->leaf) { |
547b792c | 1202 | WARN_ON(!fn->leaf); |
8ed67789 | 1203 | fn->leaf = net->ipv6.ip6_null_entry; |
1da177e4 LT |
1204 | } |
1205 | #endif | |
1206 | atomic_inc(&fn->leaf->rt6i_ref); | |
1207 | return fn->parent; | |
1208 | } | |
1209 | ||
1210 | pn = fn->parent; | |
1211 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1212 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1213 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
7fc33165 | 1214 | FIB6_SUBTREE(pn) = NULL; |
1da177e4 LT |
1215 | nstate = FWS_L; |
1216 | } else { | |
547b792c | 1217 | WARN_ON(fn->fn_flags & RTN_ROOT); |
1da177e4 | 1218 | #endif |
49e253e3 WY |
1219 | if (pn->right == fn) |
1220 | pn->right = child; | |
1221 | else if (pn->left == fn) | |
1222 | pn->left = child; | |
1da177e4 | 1223 | #if RT6_DEBUG >= 2 |
547b792c IJ |
1224 | else |
1225 | WARN_ON(1); | |
1da177e4 LT |
1226 | #endif |
1227 | if (child) | |
1228 | child->parent = pn; | |
1229 | nstate = FWS_R; | |
1230 | #ifdef CONFIG_IPV6_SUBTREES | |
1231 | } | |
1232 | #endif | |
1233 | ||
1234 | read_lock(&fib6_walker_lock); | |
1235 | FOR_WALKERS(w) { | |
507c9b1e | 1236 | if (!child) { |
1da177e4 LT |
1237 | if (w->root == fn) { |
1238 | w->root = w->node = NULL; | |
1239 | RT6_TRACE("W %p adjusted by delroot 1\n", w); | |
1240 | } else if (w->node == fn) { | |
1241 | RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate); | |
1242 | w->node = pn; | |
1243 | w->state = nstate; | |
1244 | } | |
1245 | } else { | |
1246 | if (w->root == fn) { | |
1247 | w->root = child; | |
1248 | RT6_TRACE("W %p adjusted by delroot 2\n", w); | |
1249 | } | |
1250 | if (w->node == fn) { | |
1251 | w->node = child; | |
1252 | if (children&2) { | |
1253 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
8db46f1d | 1254 | w->state = w->state >= FWS_R ? FWS_U : FWS_INIT; |
1da177e4 LT |
1255 | } else { |
1256 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
8db46f1d | 1257 | w->state = w->state >= FWS_C ? FWS_U : FWS_INIT; |
1da177e4 LT |
1258 | } |
1259 | } | |
1260 | } | |
1261 | } | |
1262 | read_unlock(&fib6_walker_lock); | |
1263 | ||
1264 | node_free(fn); | |
507c9b1e | 1265 | if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn)) |
1da177e4 LT |
1266 | return pn; |
1267 | ||
1268 | rt6_release(pn->leaf); | |
1269 | pn->leaf = NULL; | |
1270 | fn = pn; | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | static void fib6_del_route(struct fib6_node *fn, struct rt6_info **rtp, | |
86872cb5 | 1275 | struct nl_info *info) |
1da177e4 | 1276 | { |
94b2cfe0 | 1277 | struct fib6_walker *w; |
1da177e4 | 1278 | struct rt6_info *rt = *rtp; |
c572872f | 1279 | struct net *net = info->nl_net; |
1da177e4 LT |
1280 | |
1281 | RT6_TRACE("fib6_del_route\n"); | |
1282 | ||
1283 | /* Unlink it */ | |
d8d1f30b | 1284 | *rtp = rt->dst.rt6_next; |
1da177e4 | 1285 | rt->rt6i_node = NULL; |
c572872f BT |
1286 | net->ipv6.rt6_stats->fib_rt_entries--; |
1287 | net->ipv6.rt6_stats->fib_discarded_routes++; | |
1da177e4 | 1288 | |
f11e6659 DM |
1289 | /* Reset round-robin state, if necessary */ |
1290 | if (fn->rr_ptr == rt) | |
1291 | fn->rr_ptr = NULL; | |
1292 | ||
51ebd318 ND |
1293 | /* Remove this entry from other siblings */ |
1294 | if (rt->rt6i_nsiblings) { | |
1295 | struct rt6_info *sibling, *next_sibling; | |
1296 | ||
1297 | list_for_each_entry_safe(sibling, next_sibling, | |
1298 | &rt->rt6i_siblings, rt6i_siblings) | |
1299 | sibling->rt6i_nsiblings--; | |
1300 | rt->rt6i_nsiblings = 0; | |
1301 | list_del_init(&rt->rt6i_siblings); | |
1302 | } | |
1303 | ||
1da177e4 LT |
1304 | /* Adjust walkers */ |
1305 | read_lock(&fib6_walker_lock); | |
1306 | FOR_WALKERS(w) { | |
1307 | if (w->state == FWS_C && w->leaf == rt) { | |
1308 | RT6_TRACE("walker %p adjusted by delroute\n", w); | |
d8d1f30b | 1309 | w->leaf = rt->dst.rt6_next; |
507c9b1e | 1310 | if (!w->leaf) |
1da177e4 LT |
1311 | w->state = FWS_U; |
1312 | } | |
1313 | } | |
1314 | read_unlock(&fib6_walker_lock); | |
1315 | ||
d8d1f30b | 1316 | rt->dst.rt6_next = NULL; |
1da177e4 | 1317 | |
1da177e4 | 1318 | /* If it was last route, expunge its radix tree node */ |
507c9b1e | 1319 | if (!fn->leaf) { |
1da177e4 | 1320 | fn->fn_flags &= ~RTN_RTINFO; |
c572872f | 1321 | net->ipv6.rt6_stats->fib_route_nodes--; |
8ed67789 | 1322 | fn = fib6_repair_tree(net, fn); |
1da177e4 LT |
1323 | } |
1324 | ||
1325 | if (atomic_read(&rt->rt6i_ref) != 1) { | |
1326 | /* This route is used as dummy address holder in some split | |
1327 | * nodes. It is not leaked, but it still holds other resources, | |
1328 | * which must be released in time. So, scan ascendant nodes | |
1329 | * and replace dummy references to this route with references | |
1330 | * to still alive ones. | |
1331 | */ | |
1332 | while (fn) { | |
507c9b1e | 1333 | if (!(fn->fn_flags & RTN_RTINFO) && fn->leaf == rt) { |
8ed67789 | 1334 | fn->leaf = fib6_find_prefix(net, fn); |
1da177e4 LT |
1335 | atomic_inc(&fn->leaf->rt6i_ref); |
1336 | rt6_release(rt); | |
1337 | } | |
1338 | fn = fn->parent; | |
1339 | } | |
1340 | /* No more references are possible at this point. */ | |
2df96af0 | 1341 | BUG_ON(atomic_read(&rt->rt6i_ref) != 1); |
1da177e4 LT |
1342 | } |
1343 | ||
86872cb5 | 1344 | inet6_rt_notify(RTM_DELROUTE, rt, info); |
1da177e4 LT |
1345 | rt6_release(rt); |
1346 | } | |
1347 | ||
86872cb5 | 1348 | int fib6_del(struct rt6_info *rt, struct nl_info *info) |
1da177e4 | 1349 | { |
8ed67789 | 1350 | struct net *net = info->nl_net; |
1da177e4 LT |
1351 | struct fib6_node *fn = rt->rt6i_node; |
1352 | struct rt6_info **rtp; | |
1353 | ||
1354 | #if RT6_DEBUG >= 2 | |
8db46f1d | 1355 | if (rt->dst.obsolete > 0) { |
547b792c | 1356 | WARN_ON(fn != NULL); |
1da177e4 LT |
1357 | return -ENOENT; |
1358 | } | |
1359 | #endif | |
507c9b1e | 1360 | if (!fn || rt == net->ipv6.ip6_null_entry) |
1da177e4 LT |
1361 | return -ENOENT; |
1362 | ||
547b792c | 1363 | WARN_ON(!(fn->fn_flags & RTN_RTINFO)); |
1da177e4 | 1364 | |
507c9b1e | 1365 | if (!(rt->rt6i_flags & RTF_CACHE)) { |
150730d5 YH |
1366 | struct fib6_node *pn = fn; |
1367 | #ifdef CONFIG_IPV6_SUBTREES | |
1368 | /* clones of this route might be in another subtree */ | |
1369 | if (rt->rt6i_src.plen) { | |
507c9b1e | 1370 | while (!(pn->fn_flags & RTN_ROOT)) |
150730d5 YH |
1371 | pn = pn->parent; |
1372 | pn = pn->parent; | |
1373 | } | |
1374 | #endif | |
163cd4e8 | 1375 | fib6_prune_clones(info->nl_net, pn); |
150730d5 | 1376 | } |
1da177e4 LT |
1377 | |
1378 | /* | |
1379 | * Walk the leaf entries looking for ourself | |
1380 | */ | |
1381 | ||
d8d1f30b | 1382 | for (rtp = &fn->leaf; *rtp; rtp = &(*rtp)->dst.rt6_next) { |
1da177e4 | 1383 | if (*rtp == rt) { |
86872cb5 | 1384 | fib6_del_route(fn, rtp, info); |
1da177e4 LT |
1385 | return 0; |
1386 | } | |
1387 | } | |
1388 | return -ENOENT; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Tree traversal function. | |
1393 | * | |
1394 | * Certainly, it is not interrupt safe. | |
1395 | * However, it is internally reenterable wrt itself and fib6_add/fib6_del. | |
1396 | * It means, that we can modify tree during walking | |
1397 | * and use this function for garbage collection, clone pruning, | |
1ab1457c | 1398 | * cleaning tree when a device goes down etc. etc. |
1da177e4 LT |
1399 | * |
1400 | * It guarantees that every node will be traversed, | |
1401 | * and that it will be traversed only once. | |
1402 | * | |
1403 | * Callback function w->func may return: | |
1404 | * 0 -> continue walking. | |
1405 | * positive value -> walking is suspended (used by tree dumps, | |
1406 | * and probably by gc, if it will be split to several slices) | |
1407 | * negative value -> terminate walking. | |
1408 | * | |
1409 | * The function itself returns: | |
1410 | * 0 -> walk is complete. | |
1411 | * >0 -> walk is incomplete (i.e. suspended) | |
1412 | * <0 -> walk is terminated by an error. | |
1413 | */ | |
1414 | ||
94b2cfe0 | 1415 | static int fib6_walk_continue(struct fib6_walker *w) |
1da177e4 LT |
1416 | { |
1417 | struct fib6_node *fn, *pn; | |
1418 | ||
1419 | for (;;) { | |
1420 | fn = w->node; | |
507c9b1e | 1421 | if (!fn) |
1da177e4 LT |
1422 | return 0; |
1423 | ||
1424 | if (w->prune && fn != w->root && | |
507c9b1e | 1425 | fn->fn_flags & RTN_RTINFO && w->state < FWS_C) { |
1da177e4 LT |
1426 | w->state = FWS_C; |
1427 | w->leaf = fn->leaf; | |
1428 | } | |
1429 | switch (w->state) { | |
1430 | #ifdef CONFIG_IPV6_SUBTREES | |
1431 | case FWS_S: | |
7fc33165 YH |
1432 | if (FIB6_SUBTREE(fn)) { |
1433 | w->node = FIB6_SUBTREE(fn); | |
1da177e4 LT |
1434 | continue; |
1435 | } | |
1436 | w->state = FWS_L; | |
1ab1457c | 1437 | #endif |
1da177e4 LT |
1438 | case FWS_L: |
1439 | if (fn->left) { | |
1440 | w->node = fn->left; | |
1441 | w->state = FWS_INIT; | |
1442 | continue; | |
1443 | } | |
1444 | w->state = FWS_R; | |
1445 | case FWS_R: | |
1446 | if (fn->right) { | |
1447 | w->node = fn->right; | |
1448 | w->state = FWS_INIT; | |
1449 | continue; | |
1450 | } | |
1451 | w->state = FWS_C; | |
1452 | w->leaf = fn->leaf; | |
1453 | case FWS_C: | |
507c9b1e | 1454 | if (w->leaf && fn->fn_flags & RTN_RTINFO) { |
2bec5a36 PM |
1455 | int err; |
1456 | ||
fa809e2f ED |
1457 | if (w->skip) { |
1458 | w->skip--; | |
1c265854 | 1459 | goto skip; |
2bec5a36 PM |
1460 | } |
1461 | ||
1462 | err = w->func(w); | |
1da177e4 LT |
1463 | if (err) |
1464 | return err; | |
2bec5a36 PM |
1465 | |
1466 | w->count++; | |
1da177e4 LT |
1467 | continue; |
1468 | } | |
1c265854 | 1469 | skip: |
1da177e4 LT |
1470 | w->state = FWS_U; |
1471 | case FWS_U: | |
1472 | if (fn == w->root) | |
1473 | return 0; | |
1474 | pn = fn->parent; | |
1475 | w->node = pn; | |
1476 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1477 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1478 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
1da177e4 LT |
1479 | w->state = FWS_L; |
1480 | continue; | |
1481 | } | |
1482 | #endif | |
1483 | if (pn->left == fn) { | |
1484 | w->state = FWS_R; | |
1485 | continue; | |
1486 | } | |
1487 | if (pn->right == fn) { | |
1488 | w->state = FWS_C; | |
1489 | w->leaf = w->node->leaf; | |
1490 | continue; | |
1491 | } | |
1492 | #if RT6_DEBUG >= 2 | |
547b792c | 1493 | WARN_ON(1); |
1da177e4 LT |
1494 | #endif |
1495 | } | |
1496 | } | |
1497 | } | |
1498 | ||
94b2cfe0 | 1499 | static int fib6_walk(struct fib6_walker *w) |
1da177e4 LT |
1500 | { |
1501 | int res; | |
1502 | ||
1503 | w->state = FWS_INIT; | |
1504 | w->node = w->root; | |
1505 | ||
1506 | fib6_walker_link(w); | |
1507 | res = fib6_walk_continue(w); | |
1508 | if (res <= 0) | |
1509 | fib6_walker_unlink(w); | |
1510 | return res; | |
1511 | } | |
1512 | ||
94b2cfe0 | 1513 | static int fib6_clean_node(struct fib6_walker *w) |
1da177e4 LT |
1514 | { |
1515 | int res; | |
1516 | struct rt6_info *rt; | |
94b2cfe0 | 1517 | struct fib6_cleaner *c = container_of(w, struct fib6_cleaner, w); |
ec7d43c2 BT |
1518 | struct nl_info info = { |
1519 | .nl_net = c->net, | |
1520 | }; | |
1da177e4 | 1521 | |
327571cb HFS |
1522 | if (c->sernum != FIB6_NO_SERNUM_CHANGE && |
1523 | w->node->fn_sernum != c->sernum) | |
1524 | w->node->fn_sernum = c->sernum; | |
1525 | ||
1526 | if (!c->func) { | |
1527 | WARN_ON_ONCE(c->sernum == FIB6_NO_SERNUM_CHANGE); | |
1528 | w->leaf = NULL; | |
1529 | return 0; | |
1530 | } | |
1531 | ||
d8d1f30b | 1532 | for (rt = w->leaf; rt; rt = rt->dst.rt6_next) { |
1da177e4 LT |
1533 | res = c->func(rt, c->arg); |
1534 | if (res < 0) { | |
1535 | w->leaf = rt; | |
528c4ceb | 1536 | res = fib6_del(rt, &info); |
1da177e4 LT |
1537 | if (res) { |
1538 | #if RT6_DEBUG >= 2 | |
91df42be JP |
1539 | pr_debug("%s: del failed: rt=%p@%p err=%d\n", |
1540 | __func__, rt, rt->rt6i_node, res); | |
1da177e4 LT |
1541 | #endif |
1542 | continue; | |
1543 | } | |
1544 | return 0; | |
1545 | } | |
547b792c | 1546 | WARN_ON(res != 0); |
1da177e4 LT |
1547 | } |
1548 | w->leaf = rt; | |
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | /* | |
1553 | * Convenient frontend to tree walker. | |
1ab1457c | 1554 | * |
1da177e4 LT |
1555 | * func is called on each route. |
1556 | * It may return -1 -> delete this route. | |
1557 | * 0 -> continue walking | |
1558 | * | |
1559 | * prune==1 -> only immediate children of node (certainly, | |
1560 | * ignoring pure split nodes) will be scanned. | |
1561 | */ | |
1562 | ||
ec7d43c2 | 1563 | static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
8ce11e6a | 1564 | int (*func)(struct rt6_info *, void *arg), |
327571cb | 1565 | bool prune, int sernum, void *arg) |
1da177e4 | 1566 | { |
94b2cfe0 | 1567 | struct fib6_cleaner c; |
1da177e4 LT |
1568 | |
1569 | c.w.root = root; | |
1570 | c.w.func = fib6_clean_node; | |
1571 | c.w.prune = prune; | |
2bec5a36 PM |
1572 | c.w.count = 0; |
1573 | c.w.skip = 0; | |
1da177e4 | 1574 | c.func = func; |
327571cb | 1575 | c.sernum = sernum; |
1da177e4 | 1576 | c.arg = arg; |
ec7d43c2 | 1577 | c.net = net; |
1da177e4 LT |
1578 | |
1579 | fib6_walk(&c.w); | |
1580 | } | |
1581 | ||
327571cb HFS |
1582 | static void __fib6_clean_all(struct net *net, |
1583 | int (*func)(struct rt6_info *, void *), | |
1584 | int sernum, void *arg) | |
c71099ac | 1585 | { |
c71099ac | 1586 | struct fib6_table *table; |
58f09b78 | 1587 | struct hlist_head *head; |
1b43af54 | 1588 | unsigned int h; |
c71099ac | 1589 | |
1b43af54 | 1590 | rcu_read_lock(); |
a33bc5c1 | 1591 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
f3db4851 | 1592 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 1593 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { |
c71099ac | 1594 | write_lock_bh(&table->tb6_lock); |
ec7d43c2 | 1595 | fib6_clean_tree(net, &table->tb6_root, |
327571cb | 1596 | func, false, sernum, arg); |
c71099ac TG |
1597 | write_unlock_bh(&table->tb6_lock); |
1598 | } | |
1599 | } | |
1b43af54 | 1600 | rcu_read_unlock(); |
c71099ac TG |
1601 | } |
1602 | ||
327571cb HFS |
1603 | void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *), |
1604 | void *arg) | |
1605 | { | |
1606 | __fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg); | |
1607 | } | |
1608 | ||
1da177e4 LT |
1609 | static int fib6_prune_clone(struct rt6_info *rt, void *arg) |
1610 | { | |
1611 | if (rt->rt6i_flags & RTF_CACHE) { | |
1612 | RT6_TRACE("pruning clone %p\n", rt); | |
1613 | return -1; | |
1614 | } | |
1615 | ||
1616 | return 0; | |
1617 | } | |
1618 | ||
163cd4e8 | 1619 | static void fib6_prune_clones(struct net *net, struct fib6_node *fn) |
1da177e4 | 1620 | { |
327571cb HFS |
1621 | fib6_clean_tree(net, fn, fib6_prune_clone, true, |
1622 | FIB6_NO_SERNUM_CHANGE, NULL); | |
705f1c86 HFS |
1623 | } |
1624 | ||
1625 | static void fib6_flush_trees(struct net *net) | |
1626 | { | |
812918c4 | 1627 | int new_sernum = fib6_new_sernum(net); |
705f1c86 | 1628 | |
327571cb | 1629 | __fib6_clean_all(net, NULL, new_sernum, NULL); |
705f1c86 HFS |
1630 | } |
1631 | ||
1da177e4 LT |
1632 | /* |
1633 | * Garbage collection | |
1634 | */ | |
1635 | ||
1636 | static struct fib6_gc_args | |
1637 | { | |
1638 | int timeout; | |
1639 | int more; | |
1640 | } gc_args; | |
1641 | ||
1642 | static int fib6_age(struct rt6_info *rt, void *arg) | |
1643 | { | |
1644 | unsigned long now = jiffies; | |
1645 | ||
1646 | /* | |
1647 | * check addrconf expiration here. | |
1648 | * Routes are expired even if they are in use. | |
1649 | * | |
1650 | * Also age clones. Note, that clones are aged out | |
1651 | * only if they are not in use now. | |
1652 | */ | |
1653 | ||
d1918542 DM |
1654 | if (rt->rt6i_flags & RTF_EXPIRES && rt->dst.expires) { |
1655 | if (time_after(now, rt->dst.expires)) { | |
1da177e4 | 1656 | RT6_TRACE("expiring %p\n", rt); |
1da177e4 LT |
1657 | return -1; |
1658 | } | |
1659 | gc_args.more++; | |
1660 | } else if (rt->rt6i_flags & RTF_CACHE) { | |
d8d1f30b CG |
1661 | if (atomic_read(&rt->dst.__refcnt) == 0 && |
1662 | time_after_eq(now, rt->dst.lastuse + gc_args.timeout)) { | |
1da177e4 LT |
1663 | RT6_TRACE("aging clone %p\n", rt); |
1664 | return -1; | |
5339ab8b DM |
1665 | } else if (rt->rt6i_flags & RTF_GATEWAY) { |
1666 | struct neighbour *neigh; | |
1667 | __u8 neigh_flags = 0; | |
1668 | ||
1669 | neigh = dst_neigh_lookup(&rt->dst, &rt->rt6i_gateway); | |
1670 | if (neigh) { | |
1671 | neigh_flags = neigh->flags; | |
1672 | neigh_release(neigh); | |
1673 | } | |
8bd74516 | 1674 | if (!(neigh_flags & NTF_ROUTER)) { |
5339ab8b DM |
1675 | RT6_TRACE("purging route %p via non-router but gateway\n", |
1676 | rt); | |
1677 | return -1; | |
1678 | } | |
1da177e4 LT |
1679 | } |
1680 | gc_args.more++; | |
1681 | } | |
1682 | ||
1683 | return 0; | |
1684 | } | |
1685 | ||
1686 | static DEFINE_SPINLOCK(fib6_gc_lock); | |
1687 | ||
2ac3ac8f | 1688 | void fib6_run_gc(unsigned long expires, struct net *net, bool force) |
1da177e4 | 1689 | { |
49a18d86 MK |
1690 | unsigned long now; |
1691 | ||
2ac3ac8f | 1692 | if (force) { |
1da177e4 | 1693 | spin_lock_bh(&fib6_gc_lock); |
2ac3ac8f MK |
1694 | } else if (!spin_trylock_bh(&fib6_gc_lock)) { |
1695 | mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); | |
1696 | return; | |
1da177e4 | 1697 | } |
2ac3ac8f MK |
1698 | gc_args.timeout = expires ? (int)expires : |
1699 | net->ipv6.sysctl.ip6_rt_gc_interval; | |
1da177e4 | 1700 | |
3d0f24a7 | 1701 | gc_args.more = icmp6_dst_gc(); |
f3db4851 | 1702 | |
0c3584d5 | 1703 | fib6_clean_all(net, fib6_age, NULL); |
49a18d86 MK |
1704 | now = jiffies; |
1705 | net->ipv6.ip6_rt_last_gc = now; | |
1da177e4 LT |
1706 | |
1707 | if (gc_args.more) | |
c8a45222 | 1708 | mod_timer(&net->ipv6.ip6_fib_timer, |
49a18d86 | 1709 | round_jiffies(now |
c8a45222 | 1710 | + net->ipv6.sysctl.ip6_rt_gc_interval)); |
417f28bb SH |
1711 | else |
1712 | del_timer(&net->ipv6.ip6_fib_timer); | |
1da177e4 LT |
1713 | spin_unlock_bh(&fib6_gc_lock); |
1714 | } | |
1715 | ||
5b7c931d DL |
1716 | static void fib6_gc_timer_cb(unsigned long arg) |
1717 | { | |
2ac3ac8f | 1718 | fib6_run_gc(0, (struct net *)arg, true); |
5b7c931d DL |
1719 | } |
1720 | ||
2c8c1e72 | 1721 | static int __net_init fib6_net_init(struct net *net) |
1da177e4 | 1722 | { |
10da66f7 ED |
1723 | size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
1724 | ||
417f28bb | 1725 | setup_timer(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, (unsigned long)net); |
63152fc0 | 1726 | |
c572872f BT |
1727 | net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); |
1728 | if (!net->ipv6.rt6_stats) | |
1729 | goto out_timer; | |
1730 | ||
10da66f7 ED |
1731 | /* Avoid false sharing : Use at least a full cache line */ |
1732 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
1733 | ||
1734 | net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); | |
58f09b78 | 1735 | if (!net->ipv6.fib_table_hash) |
c572872f | 1736 | goto out_rt6_stats; |
e0b85590 | 1737 | |
58f09b78 DL |
1738 | net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), |
1739 | GFP_KERNEL); | |
1740 | if (!net->ipv6.fib6_main_tbl) | |
e0b85590 DL |
1741 | goto out_fib_table_hash; |
1742 | ||
58f09b78 | 1743 | net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
8ed67789 | 1744 | net->ipv6.fib6_main_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1745 | net->ipv6.fib6_main_tbl->tb6_root.fn_flags = |
1746 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1747 | inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers); |
e0b85590 DL |
1748 | |
1749 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
58f09b78 DL |
1750 | net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), |
1751 | GFP_KERNEL); | |
1752 | if (!net->ipv6.fib6_local_tbl) | |
e0b85590 | 1753 | goto out_fib6_main_tbl; |
58f09b78 | 1754 | net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
8ed67789 | 1755 | net->ipv6.fib6_local_tbl->tb6_root.leaf = net->ipv6.ip6_null_entry; |
58f09b78 DL |
1756 | net->ipv6.fib6_local_tbl->tb6_root.fn_flags = |
1757 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 1758 | inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers); |
e0b85590 | 1759 | #endif |
58f09b78 | 1760 | fib6_tables_init(net); |
f845ab6b | 1761 | |
417f28bb | 1762 | return 0; |
d63bddbe | 1763 | |
e0b85590 | 1764 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 1765 | out_fib6_main_tbl: |
58f09b78 | 1766 | kfree(net->ipv6.fib6_main_tbl); |
e0b85590 | 1767 | #endif |
e0b85590 | 1768 | out_fib_table_hash: |
58f09b78 | 1769 | kfree(net->ipv6.fib_table_hash); |
c572872f BT |
1770 | out_rt6_stats: |
1771 | kfree(net->ipv6.rt6_stats); | |
63152fc0 | 1772 | out_timer: |
417f28bb | 1773 | return -ENOMEM; |
8db46f1d | 1774 | } |
58f09b78 DL |
1775 | |
1776 | static void fib6_net_exit(struct net *net) | |
1777 | { | |
8ed67789 | 1778 | rt6_ifdown(net, NULL); |
417f28bb SH |
1779 | del_timer_sync(&net->ipv6.ip6_fib_timer); |
1780 | ||
58f09b78 | 1781 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
8e773277 | 1782 | inetpeer_invalidate_tree(&net->ipv6.fib6_local_tbl->tb6_peers); |
58f09b78 DL |
1783 | kfree(net->ipv6.fib6_local_tbl); |
1784 | #endif | |
8e773277 | 1785 | inetpeer_invalidate_tree(&net->ipv6.fib6_main_tbl->tb6_peers); |
58f09b78 DL |
1786 | kfree(net->ipv6.fib6_main_tbl); |
1787 | kfree(net->ipv6.fib_table_hash); | |
c572872f | 1788 | kfree(net->ipv6.rt6_stats); |
58f09b78 DL |
1789 | } |
1790 | ||
1791 | static struct pernet_operations fib6_net_ops = { | |
1792 | .init = fib6_net_init, | |
1793 | .exit = fib6_net_exit, | |
1794 | }; | |
1795 | ||
1796 | int __init fib6_init(void) | |
1797 | { | |
1798 | int ret = -ENOMEM; | |
63152fc0 | 1799 | |
58f09b78 DL |
1800 | fib6_node_kmem = kmem_cache_create("fib6_nodes", |
1801 | sizeof(struct fib6_node), | |
1802 | 0, SLAB_HWCACHE_ALIGN, | |
1803 | NULL); | |
1804 | if (!fib6_node_kmem) | |
1805 | goto out; | |
1806 | ||
1807 | ret = register_pernet_subsys(&fib6_net_ops); | |
1808 | if (ret) | |
c572872f | 1809 | goto out_kmem_cache_create; |
e8803b6c DM |
1810 | |
1811 | ret = __rtnl_register(PF_INET6, RTM_GETROUTE, NULL, inet6_dump_fib, | |
1812 | NULL); | |
1813 | if (ret) | |
1814 | goto out_unregister_subsys; | |
705f1c86 HFS |
1815 | |
1816 | __fib6_flush_trees = fib6_flush_trees; | |
58f09b78 DL |
1817 | out: |
1818 | return ret; | |
1819 | ||
e8803b6c DM |
1820 | out_unregister_subsys: |
1821 | unregister_pernet_subsys(&fib6_net_ops); | |
d63bddbe DL |
1822 | out_kmem_cache_create: |
1823 | kmem_cache_destroy(fib6_node_kmem); | |
1824 | goto out; | |
1da177e4 LT |
1825 | } |
1826 | ||
1827 | void fib6_gc_cleanup(void) | |
1828 | { | |
58f09b78 | 1829 | unregister_pernet_subsys(&fib6_net_ops); |
1da177e4 LT |
1830 | kmem_cache_destroy(fib6_node_kmem); |
1831 | } | |
8d2ca1d7 HFS |
1832 | |
1833 | #ifdef CONFIG_PROC_FS | |
1834 | ||
1835 | struct ipv6_route_iter { | |
1836 | struct seq_net_private p; | |
94b2cfe0 | 1837 | struct fib6_walker w; |
8d2ca1d7 HFS |
1838 | loff_t skip; |
1839 | struct fib6_table *tbl; | |
42b18706 | 1840 | int sernum; |
8d2ca1d7 HFS |
1841 | }; |
1842 | ||
1843 | static int ipv6_route_seq_show(struct seq_file *seq, void *v) | |
1844 | { | |
1845 | struct rt6_info *rt = v; | |
1846 | struct ipv6_route_iter *iter = seq->private; | |
1847 | ||
1848 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_dst.addr, rt->rt6i_dst.plen); | |
1849 | ||
1850 | #ifdef CONFIG_IPV6_SUBTREES | |
1851 | seq_printf(seq, "%pi6 %02x ", &rt->rt6i_src.addr, rt->rt6i_src.plen); | |
1852 | #else | |
1853 | seq_puts(seq, "00000000000000000000000000000000 00 "); | |
1854 | #endif | |
1855 | if (rt->rt6i_flags & RTF_GATEWAY) | |
1856 | seq_printf(seq, "%pi6", &rt->rt6i_gateway); | |
1857 | else | |
1858 | seq_puts(seq, "00000000000000000000000000000000"); | |
1859 | ||
1860 | seq_printf(seq, " %08x %08x %08x %08x %8s\n", | |
1861 | rt->rt6i_metric, atomic_read(&rt->dst.__refcnt), | |
1862 | rt->dst.__use, rt->rt6i_flags, | |
1863 | rt->dst.dev ? rt->dst.dev->name : ""); | |
1864 | iter->w.leaf = NULL; | |
1865 | return 0; | |
1866 | } | |
1867 | ||
94b2cfe0 | 1868 | static int ipv6_route_yield(struct fib6_walker *w) |
8d2ca1d7 HFS |
1869 | { |
1870 | struct ipv6_route_iter *iter = w->args; | |
1871 | ||
1872 | if (!iter->skip) | |
1873 | return 1; | |
1874 | ||
1875 | do { | |
1876 | iter->w.leaf = iter->w.leaf->dst.rt6_next; | |
1877 | iter->skip--; | |
1878 | if (!iter->skip && iter->w.leaf) | |
1879 | return 1; | |
1880 | } while (iter->w.leaf); | |
1881 | ||
1882 | return 0; | |
1883 | } | |
1884 | ||
1885 | static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter) | |
1886 | { | |
1887 | memset(&iter->w, 0, sizeof(iter->w)); | |
1888 | iter->w.func = ipv6_route_yield; | |
1889 | iter->w.root = &iter->tbl->tb6_root; | |
1890 | iter->w.state = FWS_INIT; | |
1891 | iter->w.node = iter->w.root; | |
1892 | iter->w.args = iter; | |
0a67d3ef | 1893 | iter->sernum = iter->w.root->fn_sernum; |
8d2ca1d7 HFS |
1894 | INIT_LIST_HEAD(&iter->w.lh); |
1895 | fib6_walker_link(&iter->w); | |
1896 | } | |
1897 | ||
1898 | static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl, | |
1899 | struct net *net) | |
1900 | { | |
1901 | unsigned int h; | |
1902 | struct hlist_node *node; | |
1903 | ||
1904 | if (tbl) { | |
1905 | h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1; | |
1906 | node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist)); | |
1907 | } else { | |
1908 | h = 0; | |
1909 | node = NULL; | |
1910 | } | |
1911 | ||
1912 | while (!node && h < FIB6_TABLE_HASHSZ) { | |
1913 | node = rcu_dereference_bh( | |
1914 | hlist_first_rcu(&net->ipv6.fib_table_hash[h++])); | |
1915 | } | |
1916 | return hlist_entry_safe(node, struct fib6_table, tb6_hlist); | |
1917 | } | |
1918 | ||
0a67d3ef HFS |
1919 | static void ipv6_route_check_sernum(struct ipv6_route_iter *iter) |
1920 | { | |
1921 | if (iter->sernum != iter->w.root->fn_sernum) { | |
1922 | iter->sernum = iter->w.root->fn_sernum; | |
1923 | iter->w.state = FWS_INIT; | |
1924 | iter->w.node = iter->w.root; | |
1925 | WARN_ON(iter->w.skip); | |
1926 | iter->w.skip = iter->w.count; | |
1927 | } | |
1928 | } | |
1929 | ||
8d2ca1d7 HFS |
1930 | static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
1931 | { | |
1932 | int r; | |
1933 | struct rt6_info *n; | |
1934 | struct net *net = seq_file_net(seq); | |
1935 | struct ipv6_route_iter *iter = seq->private; | |
1936 | ||
1937 | if (!v) | |
1938 | goto iter_table; | |
1939 | ||
1940 | n = ((struct rt6_info *)v)->dst.rt6_next; | |
1941 | if (n) { | |
1942 | ++*pos; | |
1943 | return n; | |
1944 | } | |
1945 | ||
1946 | iter_table: | |
0a67d3ef | 1947 | ipv6_route_check_sernum(iter); |
8d2ca1d7 HFS |
1948 | read_lock(&iter->tbl->tb6_lock); |
1949 | r = fib6_walk_continue(&iter->w); | |
1950 | read_unlock(&iter->tbl->tb6_lock); | |
1951 | if (r > 0) { | |
1952 | if (v) | |
1953 | ++*pos; | |
1954 | return iter->w.leaf; | |
1955 | } else if (r < 0) { | |
1956 | fib6_walker_unlink(&iter->w); | |
1957 | return NULL; | |
1958 | } | |
1959 | fib6_walker_unlink(&iter->w); | |
1960 | ||
1961 | iter->tbl = ipv6_route_seq_next_table(iter->tbl, net); | |
1962 | if (!iter->tbl) | |
1963 | return NULL; | |
1964 | ||
1965 | ipv6_route_seq_setup_walk(iter); | |
1966 | goto iter_table; | |
1967 | } | |
1968 | ||
1969 | static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos) | |
1970 | __acquires(RCU_BH) | |
1971 | { | |
1972 | struct net *net = seq_file_net(seq); | |
1973 | struct ipv6_route_iter *iter = seq->private; | |
1974 | ||
1975 | rcu_read_lock_bh(); | |
1976 | iter->tbl = ipv6_route_seq_next_table(NULL, net); | |
1977 | iter->skip = *pos; | |
1978 | ||
1979 | if (iter->tbl) { | |
1980 | ipv6_route_seq_setup_walk(iter); | |
1981 | return ipv6_route_seq_next(seq, NULL, pos); | |
1982 | } else { | |
1983 | return NULL; | |
1984 | } | |
1985 | } | |
1986 | ||
1987 | static bool ipv6_route_iter_active(struct ipv6_route_iter *iter) | |
1988 | { | |
94b2cfe0 | 1989 | struct fib6_walker *w = &iter->w; |
8d2ca1d7 HFS |
1990 | return w->node && !(w->state == FWS_U && w->node == w->root); |
1991 | } | |
1992 | ||
1993 | static void ipv6_route_seq_stop(struct seq_file *seq, void *v) | |
1994 | __releases(RCU_BH) | |
1995 | { | |
1996 | struct ipv6_route_iter *iter = seq->private; | |
1997 | ||
1998 | if (ipv6_route_iter_active(iter)) | |
1999 | fib6_walker_unlink(&iter->w); | |
2000 | ||
2001 | rcu_read_unlock_bh(); | |
2002 | } | |
2003 | ||
2004 | static const struct seq_operations ipv6_route_seq_ops = { | |
2005 | .start = ipv6_route_seq_start, | |
2006 | .next = ipv6_route_seq_next, | |
2007 | .stop = ipv6_route_seq_stop, | |
2008 | .show = ipv6_route_seq_show | |
2009 | }; | |
2010 | ||
2011 | int ipv6_route_open(struct inode *inode, struct file *file) | |
2012 | { | |
2013 | return seq_open_net(inode, file, &ipv6_route_seq_ops, | |
2014 | sizeof(struct ipv6_route_iter)); | |
2015 | } | |
2016 | ||
2017 | #endif /* CONFIG_PROC_FS */ |