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Commit | Line | Data |
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1da177e4 | 1 | /* |
1ab1457c | 2 | * Linux INET6 implementation |
1da177e4 LT |
3 | * Forwarding Information Database |
4 | * | |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
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 | |
cc5f0eb2 | 32 | #include <net/ip.h> |
1da177e4 LT |
33 | #include <net/ipv6.h> |
34 | #include <net/ndisc.h> | |
35 | #include <net/addrconf.h> | |
19e42e45 | 36 | #include <net/lwtunnel.h> |
df77fe4d | 37 | #include <net/fib_notifier.h> |
1da177e4 LT |
38 | |
39 | #include <net/ip6_fib.h> | |
40 | #include <net/ip6_route.h> | |
41 | ||
437de07c | 42 | static struct kmem_cache *fib6_node_kmem __read_mostly; |
1da177e4 | 43 | |
94b2cfe0 HFS |
44 | struct fib6_cleaner { |
45 | struct fib6_walker w; | |
ec7d43c2 | 46 | struct net *net; |
8d1c802b | 47 | int (*func)(struct fib6_info *, void *arg); |
327571cb | 48 | int sernum; |
1da177e4 | 49 | void *arg; |
7c6bb7d2 | 50 | bool skip_notify; |
1da177e4 LT |
51 | }; |
52 | ||
1da177e4 LT |
53 | #ifdef CONFIG_IPV6_SUBTREES |
54 | #define FWS_INIT FWS_S | |
1da177e4 LT |
55 | #else |
56 | #define FWS_INIT FWS_L | |
1da177e4 LT |
57 | #endif |
58 | ||
8d1c802b | 59 | static struct fib6_info *fib6_find_prefix(struct net *net, |
66f5d6ce WW |
60 | struct fib6_table *table, |
61 | struct fib6_node *fn); | |
62 | static struct fib6_node *fib6_repair_tree(struct net *net, | |
63 | struct fib6_table *table, | |
64 | struct fib6_node *fn); | |
9a03cd8f | 65 | static int fib6_walk(struct net *net, struct fib6_walker *w); |
94b2cfe0 | 66 | static int fib6_walk_continue(struct fib6_walker *w); |
1da177e4 LT |
67 | |
68 | /* | |
69 | * A routing update causes an increase of the serial number on the | |
70 | * affected subtree. This allows for cached routes to be asynchronously | |
71 | * tested when modifications are made to the destination cache as a | |
72 | * result of redirects, path MTU changes, etc. | |
73 | */ | |
74 | ||
86cb30ec | 75 | static void fib6_gc_timer_cb(struct timer_list *t); |
5b7c931d | 76 | |
9a03cd8f MK |
77 | #define FOR_WALKERS(net, w) \ |
78 | list_for_each_entry(w, &(net)->ipv6.fib6_walkers, lh) | |
1da177e4 | 79 | |
9a03cd8f | 80 | static void fib6_walker_link(struct net *net, struct fib6_walker *w) |
90d41122 | 81 | { |
9a03cd8f MK |
82 | write_lock_bh(&net->ipv6.fib6_walker_lock); |
83 | list_add(&w->lh, &net->ipv6.fib6_walkers); | |
84 | write_unlock_bh(&net->ipv6.fib6_walker_lock); | |
90d41122 AB |
85 | } |
86 | ||
9a03cd8f | 87 | static void fib6_walker_unlink(struct net *net, struct fib6_walker *w) |
90d41122 | 88 | { |
9a03cd8f | 89 | write_lock_bh(&net->ipv6.fib6_walker_lock); |
bbef49da | 90 | list_del(&w->lh); |
9a03cd8f | 91 | write_unlock_bh(&net->ipv6.fib6_walker_lock); |
90d41122 | 92 | } |
94b2cfe0 | 93 | |
812918c4 | 94 | static int fib6_new_sernum(struct net *net) |
1da177e4 | 95 | { |
42b18706 HFS |
96 | int new, old; |
97 | ||
98 | do { | |
812918c4 | 99 | old = atomic_read(&net->ipv6.fib6_sernum); |
42b18706 | 100 | new = old < INT_MAX ? old + 1 : 1; |
812918c4 HFS |
101 | } while (atomic_cmpxchg(&net->ipv6.fib6_sernum, |
102 | old, new) != old); | |
42b18706 | 103 | return new; |
1da177e4 LT |
104 | } |
105 | ||
327571cb HFS |
106 | enum { |
107 | FIB6_NO_SERNUM_CHANGE = 0, | |
108 | }; | |
109 | ||
93c2fb25 | 110 | void fib6_update_sernum(struct net *net, struct fib6_info *f6i) |
180ca444 | 111 | { |
180ca444 WW |
112 | struct fib6_node *fn; |
113 | ||
93c2fb25 DA |
114 | fn = rcu_dereference_protected(f6i->fib6_node, |
115 | lockdep_is_held(&f6i->fib6_table->tb6_lock)); | |
180ca444 WW |
116 | if (fn) |
117 | fn->fn_sernum = fib6_new_sernum(net); | |
180ca444 WW |
118 | } |
119 | ||
1da177e4 LT |
120 | /* |
121 | * Auxiliary address test functions for the radix tree. | |
122 | * | |
1ab1457c | 123 | * These assume a 32bit processor (although it will work on |
1da177e4 LT |
124 | * 64bit processors) |
125 | */ | |
126 | ||
127 | /* | |
128 | * test bit | |
129 | */ | |
02cdce53 YH |
130 | #if defined(__LITTLE_ENDIAN) |
131 | # define BITOP_BE32_SWIZZLE (0x1F & ~7) | |
132 | #else | |
133 | # define BITOP_BE32_SWIZZLE 0 | |
134 | #endif | |
1da177e4 | 135 | |
94b2cfe0 | 136 | static __be32 addr_bit_set(const void *token, int fn_bit) |
1da177e4 | 137 | { |
b71d1d42 | 138 | const __be32 *addr = token; |
02cdce53 YH |
139 | /* |
140 | * Here, | |
8db46f1d | 141 | * 1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f) |
02cdce53 YH |
142 | * is optimized version of |
143 | * htonl(1 << ((~fn_bit)&0x1F)) | |
144 | * See include/asm-generic/bitops/le.h. | |
145 | */ | |
0eae88f3 ED |
146 | return (__force __be32)(1 << ((~fn_bit ^ BITOP_BE32_SWIZZLE) & 0x1f)) & |
147 | addr[fn_bit >> 5]; | |
1da177e4 LT |
148 | } |
149 | ||
8d1c802b | 150 | struct fib6_info *fib6_info_alloc(gfp_t gfp_flags) |
a64efe14 | 151 | { |
8d1c802b | 152 | struct fib6_info *f6i; |
a64efe14 DA |
153 | |
154 | f6i = kzalloc(sizeof(*f6i), gfp_flags); | |
155 | if (!f6i) | |
156 | return NULL; | |
157 | ||
158 | f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags); | |
159 | if (!f6i->rt6i_pcpu) { | |
160 | kfree(f6i); | |
161 | return NULL; | |
162 | } | |
163 | ||
93c2fb25 | 164 | INIT_LIST_HEAD(&f6i->fib6_siblings); |
93c2fb25 | 165 | atomic_inc(&f6i->fib6_ref); |
a64efe14 DA |
166 | |
167 | return f6i; | |
168 | } | |
169 | ||
9b0a8da8 | 170 | void fib6_info_destroy_rcu(struct rcu_head *head) |
a64efe14 | 171 | { |
9b0a8da8 | 172 | struct fib6_info *f6i = container_of(head, struct fib6_info, rcu); |
a64efe14 DA |
173 | struct rt6_exception_bucket *bucket; |
174 | ||
93c2fb25 | 175 | WARN_ON(f6i->fib6_node); |
a64efe14 DA |
176 | |
177 | bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1); | |
b0270550 | 178 | kfree(bucket); |
a64efe14 DA |
179 | |
180 | if (f6i->rt6i_pcpu) { | |
181 | int cpu; | |
182 | ||
183 | for_each_possible_cpu(cpu) { | |
184 | struct rt6_info **ppcpu_rt; | |
185 | struct rt6_info *pcpu_rt; | |
186 | ||
187 | ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu); | |
188 | pcpu_rt = *ppcpu_rt; | |
189 | if (pcpu_rt) { | |
190 | dst_dev_put(&pcpu_rt->dst); | |
191 | dst_release(&pcpu_rt->dst); | |
192 | *ppcpu_rt = NULL; | |
193 | } | |
194 | } | |
7abab7b9 MR |
195 | |
196 | free_percpu(f6i->rt6i_pcpu); | |
a64efe14 DA |
197 | } |
198 | ||
dac7d0f2 | 199 | fib6_nh_release(&f6i->fib6_nh); |
a64efe14 | 200 | |
cc5f0eb2 | 201 | ip_fib_metrics_put(f6i->fib6_metrics); |
93531c67 | 202 | |
a64efe14 DA |
203 | kfree(f6i); |
204 | } | |
9b0a8da8 | 205 | EXPORT_SYMBOL_GPL(fib6_info_destroy_rcu); |
a64efe14 | 206 | |
81eb8447 | 207 | static struct fib6_node *node_alloc(struct net *net) |
1da177e4 LT |
208 | { |
209 | struct fib6_node *fn; | |
210 | ||
c3762229 | 211 | fn = kmem_cache_zalloc(fib6_node_kmem, GFP_ATOMIC); |
81eb8447 WW |
212 | if (fn) |
213 | net->ipv6.rt6_stats->fib_nodes++; | |
1da177e4 LT |
214 | |
215 | return fn; | |
216 | } | |
217 | ||
81eb8447 | 218 | static void node_free_immediate(struct net *net, struct fib6_node *fn) |
c5cff856 WW |
219 | { |
220 | kmem_cache_free(fib6_node_kmem, fn); | |
81eb8447 | 221 | net->ipv6.rt6_stats->fib_nodes--; |
c5cff856 WW |
222 | } |
223 | ||
224 | static void node_free_rcu(struct rcu_head *head) | |
1da177e4 | 225 | { |
c5cff856 WW |
226 | struct fib6_node *fn = container_of(head, struct fib6_node, rcu); |
227 | ||
1da177e4 LT |
228 | kmem_cache_free(fib6_node_kmem, fn); |
229 | } | |
230 | ||
81eb8447 | 231 | static void node_free(struct net *net, struct fib6_node *fn) |
c5cff856 WW |
232 | { |
233 | call_rcu(&fn->rcu, node_free_rcu); | |
81eb8447 | 234 | net->ipv6.rt6_stats->fib_nodes--; |
c5cff856 WW |
235 | } |
236 | ||
ba1cc08d SD |
237 | static void fib6_free_table(struct fib6_table *table) |
238 | { | |
239 | inetpeer_invalidate_tree(&table->tb6_peers); | |
240 | kfree(table); | |
241 | } | |
242 | ||
58f09b78 | 243 | static void fib6_link_table(struct net *net, struct fib6_table *tb) |
1b43af54 PM |
244 | { |
245 | unsigned int h; | |
246 | ||
375216ad TG |
247 | /* |
248 | * Initialize table lock at a single place to give lockdep a key, | |
249 | * tables aren't visible prior to being linked to the list. | |
250 | */ | |
66f5d6ce | 251 | spin_lock_init(&tb->tb6_lock); |
a33bc5c1 | 252 | h = tb->tb6_id & (FIB6_TABLE_HASHSZ - 1); |
1b43af54 PM |
253 | |
254 | /* | |
255 | * No protection necessary, this is the only list mutatation | |
256 | * operation, tables never disappear once they exist. | |
257 | */ | |
58f09b78 | 258 | hlist_add_head_rcu(&tb->tb6_hlist, &net->ipv6.fib_table_hash[h]); |
1b43af54 | 259 | } |
c71099ac | 260 | |
1b43af54 | 261 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 262 | |
8ed67789 | 263 | static struct fib6_table *fib6_alloc_table(struct net *net, u32 id) |
c71099ac TG |
264 | { |
265 | struct fib6_table *table; | |
266 | ||
267 | table = kzalloc(sizeof(*table), GFP_ATOMIC); | |
507c9b1e | 268 | if (table) { |
c71099ac | 269 | table->tb6_id = id; |
66f5d6ce | 270 | rcu_assign_pointer(table->tb6_root.leaf, |
421842ed | 271 | net->ipv6.fib6_null_entry); |
c71099ac | 272 | table->tb6_root.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; |
8e773277 | 273 | inet_peer_base_init(&table->tb6_peers); |
c71099ac TG |
274 | } |
275 | ||
276 | return table; | |
277 | } | |
278 | ||
58f09b78 | 279 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac TG |
280 | { |
281 | struct fib6_table *tb; | |
282 | ||
283 | if (id == 0) | |
284 | id = RT6_TABLE_MAIN; | |
58f09b78 | 285 | tb = fib6_get_table(net, id); |
c71099ac TG |
286 | if (tb) |
287 | return tb; | |
288 | ||
8ed67789 | 289 | tb = fib6_alloc_table(net, id); |
507c9b1e | 290 | if (tb) |
58f09b78 | 291 | fib6_link_table(net, tb); |
c71099ac TG |
292 | |
293 | return tb; | |
294 | } | |
b3b4663c | 295 | EXPORT_SYMBOL_GPL(fib6_new_table); |
c71099ac | 296 | |
58f09b78 | 297 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac TG |
298 | { |
299 | struct fib6_table *tb; | |
58f09b78 | 300 | struct hlist_head *head; |
c71099ac TG |
301 | unsigned int h; |
302 | ||
303 | if (id == 0) | |
304 | id = RT6_TABLE_MAIN; | |
a33bc5c1 | 305 | h = id & (FIB6_TABLE_HASHSZ - 1); |
c71099ac | 306 | rcu_read_lock(); |
58f09b78 | 307 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 308 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
c71099ac TG |
309 | if (tb->tb6_id == id) { |
310 | rcu_read_unlock(); | |
311 | return tb; | |
312 | } | |
313 | } | |
314 | rcu_read_unlock(); | |
315 | ||
316 | return NULL; | |
317 | } | |
c4850687 | 318 | EXPORT_SYMBOL_GPL(fib6_get_table); |
c71099ac | 319 | |
2c8c1e72 | 320 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 321 | { |
58f09b78 DL |
322 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
323 | fib6_link_table(net, net->ipv6.fib6_local_tbl); | |
c71099ac | 324 | } |
c71099ac TG |
325 | #else |
326 | ||
58f09b78 | 327 | struct fib6_table *fib6_new_table(struct net *net, u32 id) |
c71099ac | 328 | { |
58f09b78 | 329 | return fib6_get_table(net, id); |
c71099ac TG |
330 | } |
331 | ||
58f09b78 | 332 | struct fib6_table *fib6_get_table(struct net *net, u32 id) |
c71099ac | 333 | { |
58f09b78 | 334 | return net->ipv6.fib6_main_tbl; |
c71099ac TG |
335 | } |
336 | ||
4c9483b2 | 337 | struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 338 | const struct sk_buff *skb, |
58f09b78 | 339 | int flags, pol_lookup_t lookup) |
c71099ac | 340 | { |
ab997ad4 | 341 | struct rt6_info *rt; |
342 | ||
b75cc8f9 | 343 | rt = lookup(net, net->ipv6.fib6_main_tbl, fl6, skb, flags); |
07f61557 | 344 | if (rt->dst.error == -EAGAIN) { |
ab997ad4 | 345 | ip6_rt_put(rt); |
346 | rt = net->ipv6.ip6_null_entry; | |
347 | dst_hold(&rt->dst); | |
348 | } | |
349 | ||
350 | return &rt->dst; | |
c71099ac TG |
351 | } |
352 | ||
138118ec | 353 | /* called with rcu lock held; no reference taken on fib6_info */ |
effda4dd DA |
354 | int fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, |
355 | struct fib6_result *res, int flags) | |
138118ec | 356 | { |
effda4dd DA |
357 | return fib6_table_lookup(net, net->ipv6.fib6_main_tbl, oif, fl6, |
358 | res, flags); | |
138118ec DA |
359 | } |
360 | ||
2c8c1e72 | 361 | static void __net_init fib6_tables_init(struct net *net) |
c71099ac | 362 | { |
58f09b78 | 363 | fib6_link_table(net, net->ipv6.fib6_main_tbl); |
c71099ac TG |
364 | } |
365 | ||
366 | #endif | |
367 | ||
e1ee0a5b IS |
368 | unsigned int fib6_tables_seq_read(struct net *net) |
369 | { | |
370 | unsigned int h, fib_seq = 0; | |
371 | ||
372 | rcu_read_lock(); | |
373 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
374 | struct hlist_head *head = &net->ipv6.fib_table_hash[h]; | |
375 | struct fib6_table *tb; | |
376 | ||
66f5d6ce | 377 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) |
e1ee0a5b | 378 | fib_seq += tb->fib_seq; |
e1ee0a5b IS |
379 | } |
380 | rcu_read_unlock(); | |
381 | ||
382 | return fib_seq; | |
383 | } | |
384 | ||
385 | static int call_fib6_entry_notifier(struct notifier_block *nb, struct net *net, | |
386 | enum fib_event_type event_type, | |
8d1c802b | 387 | struct fib6_info *rt) |
e1ee0a5b IS |
388 | { |
389 | struct fib6_entry_notifier_info info = { | |
390 | .rt = rt, | |
391 | }; | |
392 | ||
393 | return call_fib6_notifier(nb, net, event_type, &info.info); | |
394 | } | |
395 | ||
df77fe4d IS |
396 | static int call_fib6_entry_notifiers(struct net *net, |
397 | enum fib_event_type event_type, | |
8d1c802b | 398 | struct fib6_info *rt, |
6c31e5a9 | 399 | struct netlink_ext_ack *extack) |
df77fe4d IS |
400 | { |
401 | struct fib6_entry_notifier_info info = { | |
6c31e5a9 | 402 | .info.extack = extack, |
df77fe4d IS |
403 | .rt = rt, |
404 | }; | |
405 | ||
93c2fb25 | 406 | rt->fib6_table->fib_seq++; |
df77fe4d IS |
407 | return call_fib6_notifiers(net, event_type, &info.info); |
408 | } | |
409 | ||
e1ee0a5b IS |
410 | struct fib6_dump_arg { |
411 | struct net *net; | |
412 | struct notifier_block *nb; | |
413 | }; | |
414 | ||
8d1c802b | 415 | static void fib6_rt_dump(struct fib6_info *rt, struct fib6_dump_arg *arg) |
e1ee0a5b | 416 | { |
421842ed | 417 | if (rt == arg->net->ipv6.fib6_null_entry) |
e1ee0a5b IS |
418 | return; |
419 | call_fib6_entry_notifier(arg->nb, arg->net, FIB_EVENT_ENTRY_ADD, rt); | |
420 | } | |
421 | ||
422 | static int fib6_node_dump(struct fib6_walker *w) | |
423 | { | |
8d1c802b | 424 | struct fib6_info *rt; |
e1ee0a5b | 425 | |
66f5d6ce | 426 | for_each_fib6_walker_rt(w) |
e1ee0a5b IS |
427 | fib6_rt_dump(rt, w->args); |
428 | w->leaf = NULL; | |
429 | return 0; | |
430 | } | |
431 | ||
432 | static void fib6_table_dump(struct net *net, struct fib6_table *tb, | |
433 | struct fib6_walker *w) | |
434 | { | |
435 | w->root = &tb->tb6_root; | |
66f5d6ce | 436 | spin_lock_bh(&tb->tb6_lock); |
e1ee0a5b | 437 | fib6_walk(net, w); |
66f5d6ce | 438 | spin_unlock_bh(&tb->tb6_lock); |
e1ee0a5b IS |
439 | } |
440 | ||
441 | /* Called with rcu_read_lock() */ | |
442 | int fib6_tables_dump(struct net *net, struct notifier_block *nb) | |
443 | { | |
444 | struct fib6_dump_arg arg; | |
445 | struct fib6_walker *w; | |
446 | unsigned int h; | |
447 | ||
448 | w = kzalloc(sizeof(*w), GFP_ATOMIC); | |
449 | if (!w) | |
450 | return -ENOMEM; | |
451 | ||
452 | w->func = fib6_node_dump; | |
453 | arg.net = net; | |
454 | arg.nb = nb; | |
455 | w->args = &arg; | |
456 | ||
457 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { | |
458 | struct hlist_head *head = &net->ipv6.fib_table_hash[h]; | |
459 | struct fib6_table *tb; | |
460 | ||
461 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) | |
462 | fib6_table_dump(net, tb, w); | |
463 | } | |
464 | ||
465 | kfree(w); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
94b2cfe0 | 470 | static int fib6_dump_node(struct fib6_walker *w) |
1b43af54 PM |
471 | { |
472 | int res; | |
8d1c802b | 473 | struct fib6_info *rt; |
1b43af54 | 474 | |
66f5d6ce | 475 | for_each_fib6_walker_rt(w) { |
1b43af54 PM |
476 | res = rt6_dump_route(rt, w->args); |
477 | if (res < 0) { | |
478 | /* Frame is full, suspend walking */ | |
479 | w->leaf = rt; | |
480 | return 1; | |
481 | } | |
beb1afac DA |
482 | |
483 | /* Multipath routes are dumped in one route with the | |
484 | * RTA_MULTIPATH attribute. Jump 'rt' to point to the | |
485 | * last sibling of this route (no need to dump the | |
486 | * sibling routes again) | |
487 | */ | |
93c2fb25 DA |
488 | if (rt->fib6_nsiblings) |
489 | rt = list_last_entry(&rt->fib6_siblings, | |
8d1c802b | 490 | struct fib6_info, |
93c2fb25 | 491 | fib6_siblings); |
1b43af54 PM |
492 | } |
493 | w->leaf = NULL; | |
494 | return 0; | |
495 | } | |
496 | ||
497 | static void fib6_dump_end(struct netlink_callback *cb) | |
498 | { | |
9a03cd8f | 499 | struct net *net = sock_net(cb->skb->sk); |
94b2cfe0 | 500 | struct fib6_walker *w = (void *)cb->args[2]; |
1b43af54 PM |
501 | |
502 | if (w) { | |
7891cc81 HX |
503 | if (cb->args[4]) { |
504 | cb->args[4] = 0; | |
9a03cd8f | 505 | fib6_walker_unlink(net, w); |
7891cc81 | 506 | } |
1b43af54 PM |
507 | cb->args[2] = 0; |
508 | kfree(w); | |
509 | } | |
437de07c | 510 | cb->done = (void *)cb->args[3]; |
1b43af54 PM |
511 | cb->args[1] = 3; |
512 | } | |
513 | ||
514 | static int fib6_dump_done(struct netlink_callback *cb) | |
515 | { | |
516 | fib6_dump_end(cb); | |
517 | return cb->done ? cb->done(cb) : 0; | |
518 | } | |
519 | ||
520 | static int fib6_dump_table(struct fib6_table *table, struct sk_buff *skb, | |
521 | struct netlink_callback *cb) | |
522 | { | |
9a03cd8f | 523 | struct net *net = sock_net(skb->sk); |
94b2cfe0 | 524 | struct fib6_walker *w; |
1b43af54 PM |
525 | int res; |
526 | ||
527 | w = (void *)cb->args[2]; | |
528 | w->root = &table->tb6_root; | |
529 | ||
530 | if (cb->args[4] == 0) { | |
2bec5a36 PM |
531 | w->count = 0; |
532 | w->skip = 0; | |
533 | ||
66f5d6ce | 534 | spin_lock_bh(&table->tb6_lock); |
9a03cd8f | 535 | res = fib6_walk(net, w); |
66f5d6ce | 536 | spin_unlock_bh(&table->tb6_lock); |
2bec5a36 | 537 | if (res > 0) { |
1b43af54 | 538 | cb->args[4] = 1; |
2bec5a36 PM |
539 | cb->args[5] = w->root->fn_sernum; |
540 | } | |
1b43af54 | 541 | } else { |
2bec5a36 PM |
542 | if (cb->args[5] != w->root->fn_sernum) { |
543 | /* Begin at the root if the tree changed */ | |
544 | cb->args[5] = w->root->fn_sernum; | |
545 | w->state = FWS_INIT; | |
546 | w->node = w->root; | |
547 | w->skip = w->count; | |
548 | } else | |
549 | w->skip = 0; | |
550 | ||
66f5d6ce | 551 | spin_lock_bh(&table->tb6_lock); |
1b43af54 | 552 | res = fib6_walk_continue(w); |
66f5d6ce | 553 | spin_unlock_bh(&table->tb6_lock); |
7891cc81 | 554 | if (res <= 0) { |
9a03cd8f | 555 | fib6_walker_unlink(net, w); |
7891cc81 | 556 | cb->args[4] = 0; |
1b43af54 | 557 | } |
1b43af54 | 558 | } |
7891cc81 | 559 | |
1b43af54 PM |
560 | return res; |
561 | } | |
562 | ||
c127ea2c | 563 | static int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb) |
1b43af54 | 564 | { |
e8ba330a | 565 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 566 | struct net *net = sock_net(skb->sk); |
4724676d | 567 | struct rt6_rtnl_dump_arg arg = {}; |
1b43af54 PM |
568 | unsigned int h, s_h; |
569 | unsigned int e = 0, s_e; | |
94b2cfe0 | 570 | struct fib6_walker *w; |
1b43af54 | 571 | struct fib6_table *tb; |
58f09b78 | 572 | struct hlist_head *head; |
1b43af54 PM |
573 | int res = 0; |
574 | ||
e8ba330a | 575 | if (cb->strict_check) { |
4724676d | 576 | int err; |
e8ba330a | 577 | |
effe6792 | 578 | err = ip_valid_fib_dump_req(net, nlh, &arg.filter, cb); |
e8ba330a DA |
579 | if (err < 0) |
580 | return err; | |
13e38901 DA |
581 | } else if (nlmsg_len(nlh) >= sizeof(struct rtmsg)) { |
582 | struct rtmsg *rtm = nlmsg_data(nlh); | |
e8ba330a | 583 | |
08e814c9 | 584 | arg.filter.flags = rtm->rtm_flags & (RTM_F_PREFIX|RTM_F_CLONED); |
13e38901 | 585 | } |
1b43af54 | 586 | |
08e814c9 DA |
587 | /* fib entries are never clones */ |
588 | if (arg.filter.flags & RTM_F_CLONED) | |
e22d0bfa | 589 | goto out; |
08e814c9 | 590 | |
1b43af54 | 591 | w = (void *)cb->args[2]; |
507c9b1e | 592 | if (!w) { |
1b43af54 PM |
593 | /* New dump: |
594 | * | |
595 | * 1. hook callback destructor. | |
596 | */ | |
597 | cb->args[3] = (long)cb->done; | |
598 | cb->done = fib6_dump_done; | |
599 | ||
600 | /* | |
601 | * 2. allocate and initialize walker. | |
602 | */ | |
603 | w = kzalloc(sizeof(*w), GFP_ATOMIC); | |
507c9b1e | 604 | if (!w) |
1b43af54 PM |
605 | return -ENOMEM; |
606 | w->func = fib6_dump_node; | |
607 | cb->args[2] = (long)w; | |
608 | } | |
609 | ||
610 | arg.skb = skb; | |
611 | arg.cb = cb; | |
191cd582 | 612 | arg.net = net; |
1b43af54 PM |
613 | w->args = &arg; |
614 | ||
13e38901 DA |
615 | if (arg.filter.table_id) { |
616 | tb = fib6_get_table(net, arg.filter.table_id); | |
617 | if (!tb) { | |
ae677bbb | 618 | if (arg.filter.dump_all_families) |
e22d0bfa | 619 | goto out; |
ae677bbb | 620 | |
13e38901 DA |
621 | NL_SET_ERR_MSG_MOD(cb->extack, "FIB table does not exist"); |
622 | return -ENOENT; | |
623 | } | |
624 | ||
73155879 DA |
625 | if (!cb->args[0]) { |
626 | res = fib6_dump_table(tb, skb, cb); | |
627 | if (!res) | |
628 | cb->args[0] = 1; | |
629 | } | |
13e38901 DA |
630 | goto out; |
631 | } | |
632 | ||
633 | s_h = cb->args[0]; | |
634 | s_e = cb->args[1]; | |
635 | ||
e67f88dd | 636 | rcu_read_lock(); |
a33bc5c1 | 637 | for (h = s_h; h < FIB6_TABLE_HASHSZ; h++, s_e = 0) { |
1b43af54 | 638 | e = 0; |
58f09b78 | 639 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 640 | hlist_for_each_entry_rcu(tb, head, tb6_hlist) { |
1b43af54 PM |
641 | if (e < s_e) |
642 | goto next; | |
643 | res = fib6_dump_table(tb, skb, cb); | |
644 | if (res != 0) | |
13e38901 | 645 | goto out_unlock; |
1b43af54 PM |
646 | next: |
647 | e++; | |
648 | } | |
649 | } | |
13e38901 | 650 | out_unlock: |
e67f88dd | 651 | rcu_read_unlock(); |
1b43af54 PM |
652 | cb->args[1] = e; |
653 | cb->args[0] = h; | |
13e38901 | 654 | out: |
1b43af54 PM |
655 | res = res < 0 ? res : skb->len; |
656 | if (res <= 0) | |
657 | fib6_dump_end(cb); | |
658 | return res; | |
659 | } | |
1da177e4 | 660 | |
8d1c802b | 661 | void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val) |
d4ead6b3 DA |
662 | { |
663 | if (!f6i) | |
664 | return; | |
665 | ||
666 | if (f6i->fib6_metrics == &dst_default_metrics) { | |
667 | struct dst_metrics *p = kzalloc(sizeof(*p), GFP_ATOMIC); | |
668 | ||
669 | if (!p) | |
670 | return; | |
671 | ||
672 | refcount_set(&p->refcnt, 1); | |
673 | f6i->fib6_metrics = p; | |
674 | } | |
675 | ||
676 | f6i->fib6_metrics->metrics[metric - 1] = val; | |
677 | } | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * Routing Table | |
681 | * | |
682 | * return the appropriate node for a routing tree "add" operation | |
683 | * by either creating and inserting or by returning an existing | |
684 | * node. | |
685 | */ | |
686 | ||
81eb8447 WW |
687 | static struct fib6_node *fib6_add_1(struct net *net, |
688 | struct fib6_table *table, | |
66f5d6ce WW |
689 | struct fib6_node *root, |
690 | struct in6_addr *addr, int plen, | |
691 | int offset, int allow_create, | |
692 | int replace_required, | |
693 | struct netlink_ext_ack *extack) | |
1da177e4 LT |
694 | { |
695 | struct fib6_node *fn, *in, *ln; | |
696 | struct fib6_node *pn = NULL; | |
697 | struct rt6key *key; | |
698 | int bit; | |
1ab1457c | 699 | __be32 dir = 0; |
1da177e4 LT |
700 | |
701 | RT6_TRACE("fib6_add_1\n"); | |
702 | ||
703 | /* insert node in tree */ | |
704 | ||
705 | fn = root; | |
706 | ||
707 | do { | |
8d1c802b | 708 | struct fib6_info *leaf = rcu_dereference_protected(fn->leaf, |
66f5d6ce WW |
709 | lockdep_is_held(&table->tb6_lock)); |
710 | key = (struct rt6key *)((u8 *)leaf + offset); | |
1da177e4 LT |
711 | |
712 | /* | |
713 | * Prefix match | |
714 | */ | |
715 | if (plen < fn->fn_bit || | |
4a287eba | 716 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) { |
14df015b MV |
717 | if (!allow_create) { |
718 | if (replace_required) { | |
d5d531cb DA |
719 | NL_SET_ERR_MSG(extack, |
720 | "Can not replace route - no match found"); | |
f3213831 | 721 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
722 | return ERR_PTR(-ENOENT); |
723 | } | |
f3213831 | 724 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
14df015b | 725 | } |
1da177e4 | 726 | goto insert_above; |
4a287eba | 727 | } |
1ab1457c | 728 | |
1da177e4 LT |
729 | /* |
730 | * Exact match ? | |
731 | */ | |
1ab1457c | 732 | |
1da177e4 LT |
733 | if (plen == fn->fn_bit) { |
734 | /* clean up an intermediate node */ | |
507c9b1e | 735 | if (!(fn->fn_flags & RTN_RTINFO)) { |
66f5d6ce | 736 | RCU_INIT_POINTER(fn->leaf, NULL); |
93531c67 | 737 | fib6_info_release(leaf); |
4512c43e WW |
738 | /* remove null_entry in the root node */ |
739 | } else if (fn->fn_flags & RTN_TL_ROOT && | |
740 | rcu_access_pointer(fn->leaf) == | |
421842ed | 741 | net->ipv6.fib6_null_entry) { |
4512c43e | 742 | RCU_INIT_POINTER(fn->leaf, NULL); |
1da177e4 | 743 | } |
1ab1457c | 744 | |
1da177e4 LT |
745 | return fn; |
746 | } | |
747 | ||
748 | /* | |
749 | * We have more bits to go | |
750 | */ | |
1ab1457c | 751 | |
1da177e4 | 752 | /* Try to walk down on tree. */ |
1da177e4 LT |
753 | dir = addr_bit_set(addr, fn->fn_bit); |
754 | pn = fn; | |
66f5d6ce WW |
755 | fn = dir ? |
756 | rcu_dereference_protected(fn->right, | |
757 | lockdep_is_held(&table->tb6_lock)) : | |
758 | rcu_dereference_protected(fn->left, | |
759 | lockdep_is_held(&table->tb6_lock)); | |
1da177e4 LT |
760 | } while (fn); |
761 | ||
14df015b | 762 | if (!allow_create) { |
4a287eba MV |
763 | /* We should not create new node because |
764 | * NLM_F_REPLACE was specified without NLM_F_CREATE | |
765 | * I assume it is safe to require NLM_F_CREATE when | |
766 | * REPLACE flag is used! Later we may want to remove the | |
767 | * check for replace_required, because according | |
768 | * to netlink specification, NLM_F_CREATE | |
769 | * MUST be specified if new route is created. | |
770 | * That would keep IPv6 consistent with IPv4 | |
771 | */ | |
14df015b | 772 | if (replace_required) { |
d5d531cb DA |
773 | NL_SET_ERR_MSG(extack, |
774 | "Can not replace route - no match found"); | |
f3213831 | 775 | pr_warn("Can't replace route, no match found\n"); |
14df015b MV |
776 | return ERR_PTR(-ENOENT); |
777 | } | |
f3213831 | 778 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba | 779 | } |
1da177e4 LT |
780 | /* |
781 | * We walked to the bottom of tree. | |
782 | * Create new leaf node without children. | |
783 | */ | |
784 | ||
81eb8447 | 785 | ln = node_alloc(net); |
1da177e4 | 786 | |
507c9b1e | 787 | if (!ln) |
188c517a | 788 | return ERR_PTR(-ENOMEM); |
1da177e4 | 789 | ln->fn_bit = plen; |
66f5d6ce | 790 | RCU_INIT_POINTER(ln->parent, pn); |
1da177e4 LT |
791 | |
792 | if (dir) | |
66f5d6ce | 793 | rcu_assign_pointer(pn->right, ln); |
1da177e4 | 794 | else |
66f5d6ce | 795 | rcu_assign_pointer(pn->left, ln); |
1da177e4 LT |
796 | |
797 | return ln; | |
798 | ||
799 | ||
800 | insert_above: | |
801 | /* | |
1ab1457c | 802 | * split since we don't have a common prefix anymore or |
1da177e4 LT |
803 | * we have a less significant route. |
804 | * we've to insert an intermediate node on the list | |
805 | * this new node will point to the one we need to create | |
806 | * and the current | |
807 | */ | |
808 | ||
66f5d6ce WW |
809 | pn = rcu_dereference_protected(fn->parent, |
810 | lockdep_is_held(&table->tb6_lock)); | |
1da177e4 LT |
811 | |
812 | /* find 1st bit in difference between the 2 addrs. | |
813 | ||
971f359d | 814 | See comment in __ipv6_addr_diff: bit may be an invalid value, |
1da177e4 LT |
815 | but if it is >= plen, the value is ignored in any case. |
816 | */ | |
1ab1457c | 817 | |
9225b230 | 818 | bit = __ipv6_addr_diff(addr, &key->addr, sizeof(*addr)); |
1da177e4 | 819 | |
1ab1457c YH |
820 | /* |
821 | * (intermediate)[in] | |
1da177e4 LT |
822 | * / \ |
823 | * (new leaf node)[ln] (old node)[fn] | |
824 | */ | |
825 | if (plen > bit) { | |
81eb8447 WW |
826 | in = node_alloc(net); |
827 | ln = node_alloc(net); | |
1ab1457c | 828 | |
507c9b1e | 829 | if (!in || !ln) { |
1da177e4 | 830 | if (in) |
81eb8447 | 831 | node_free_immediate(net, in); |
1da177e4 | 832 | if (ln) |
81eb8447 | 833 | node_free_immediate(net, ln); |
188c517a | 834 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
835 | } |
836 | ||
1ab1457c YH |
837 | /* |
838 | * new intermediate node. | |
1da177e4 LT |
839 | * RTN_RTINFO will |
840 | * be off since that an address that chooses one of | |
841 | * the branches would not match less specific routes | |
842 | * in the other branch | |
843 | */ | |
844 | ||
845 | in->fn_bit = bit; | |
846 | ||
66f5d6ce | 847 | RCU_INIT_POINTER(in->parent, pn); |
1da177e4 | 848 | in->leaf = fn->leaf; |
66f5d6ce | 849 | atomic_inc(&rcu_dereference_protected(in->leaf, |
93c2fb25 | 850 | lockdep_is_held(&table->tb6_lock))->fib6_ref); |
1da177e4 | 851 | |
1da177e4 LT |
852 | /* update parent pointer */ |
853 | if (dir) | |
66f5d6ce | 854 | rcu_assign_pointer(pn->right, in); |
1da177e4 | 855 | else |
66f5d6ce | 856 | rcu_assign_pointer(pn->left, in); |
1da177e4 LT |
857 | |
858 | ln->fn_bit = plen; | |
859 | ||
66f5d6ce WW |
860 | RCU_INIT_POINTER(ln->parent, in); |
861 | rcu_assign_pointer(fn->parent, in); | |
1da177e4 | 862 | |
1da177e4 | 863 | if (addr_bit_set(addr, bit)) { |
66f5d6ce WW |
864 | rcu_assign_pointer(in->right, ln); |
865 | rcu_assign_pointer(in->left, fn); | |
1da177e4 | 866 | } else { |
66f5d6ce WW |
867 | rcu_assign_pointer(in->left, ln); |
868 | rcu_assign_pointer(in->right, fn); | |
1da177e4 LT |
869 | } |
870 | } else { /* plen <= bit */ | |
871 | ||
1ab1457c | 872 | /* |
1da177e4 LT |
873 | * (new leaf node)[ln] |
874 | * / \ | |
875 | * (old node)[fn] NULL | |
876 | */ | |
877 | ||
81eb8447 | 878 | ln = node_alloc(net); |
1da177e4 | 879 | |
507c9b1e | 880 | if (!ln) |
188c517a | 881 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
882 | |
883 | ln->fn_bit = plen; | |
884 | ||
66f5d6ce | 885 | RCU_INIT_POINTER(ln->parent, pn); |
1da177e4 LT |
886 | |
887 | if (addr_bit_set(&key->addr, plen)) | |
66f5d6ce | 888 | RCU_INIT_POINTER(ln->right, fn); |
1da177e4 | 889 | else |
66f5d6ce WW |
890 | RCU_INIT_POINTER(ln->left, fn); |
891 | ||
892 | rcu_assign_pointer(fn->parent, ln); | |
1da177e4 | 893 | |
66f5d6ce WW |
894 | if (dir) |
895 | rcu_assign_pointer(pn->right, ln); | |
896 | else | |
897 | rcu_assign_pointer(pn->left, ln); | |
1da177e4 LT |
898 | } |
899 | return ln; | |
900 | } | |
901 | ||
5bcaa41b DA |
902 | static void fib6_drop_pcpu_from(struct fib6_info *f6i, |
903 | const struct fib6_table *table) | |
e715b6d3 | 904 | { |
5bcaa41b | 905 | int cpu; |
e715b6d3 | 906 | |
5bcaa41b DA |
907 | /* release the reference to this fib entry from |
908 | * all of its cached pcpu routes | |
909 | */ | |
910 | for_each_possible_cpu(cpu) { | |
911 | struct rt6_info **ppcpu_rt; | |
912 | struct rt6_info *pcpu_rt; | |
e715b6d3 | 913 | |
5bcaa41b DA |
914 | ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu); |
915 | pcpu_rt = *ppcpu_rt; | |
916 | if (pcpu_rt) { | |
a68886a6 | 917 | struct fib6_info *from; |
e715b6d3 | 918 | |
a68886a6 DA |
919 | from = rcu_dereference_protected(pcpu_rt->from, |
920 | lockdep_is_held(&table->tb6_lock)); | |
921 | rcu_assign_pointer(pcpu_rt->from, NULL); | |
922 | fib6_info_release(from); | |
5bcaa41b | 923 | } |
e5fd387a | 924 | } |
e5fd387a MK |
925 | } |
926 | ||
8d1c802b | 927 | static void fib6_purge_rt(struct fib6_info *rt, struct fib6_node *fn, |
6e9e16e6 HFS |
928 | struct net *net) |
929 | { | |
93c2fb25 | 930 | struct fib6_table *table = rt->fib6_table; |
66f5d6ce | 931 | |
93c2fb25 | 932 | if (atomic_read(&rt->fib6_ref) != 1) { |
6e9e16e6 HFS |
933 | /* This route is used as dummy address holder in some split |
934 | * nodes. It is not leaked, but it still holds other resources, | |
935 | * which must be released in time. So, scan ascendant nodes | |
936 | * and replace dummy references to this route with references | |
937 | * to still alive ones. | |
938 | */ | |
939 | while (fn) { | |
8d1c802b | 940 | struct fib6_info *leaf = rcu_dereference_protected(fn->leaf, |
66f5d6ce | 941 | lockdep_is_held(&table->tb6_lock)); |
8d1c802b | 942 | struct fib6_info *new_leaf; |
66f5d6ce WW |
943 | if (!(fn->fn_flags & RTN_RTINFO) && leaf == rt) { |
944 | new_leaf = fib6_find_prefix(net, table, fn); | |
93c2fb25 | 945 | atomic_inc(&new_leaf->fib6_ref); |
93531c67 | 946 | |
66f5d6ce | 947 | rcu_assign_pointer(fn->leaf, new_leaf); |
93531c67 | 948 | fib6_info_release(rt); |
6e9e16e6 | 949 | } |
66f5d6ce WW |
950 | fn = rcu_dereference_protected(fn->parent, |
951 | lockdep_is_held(&table->tb6_lock)); | |
6e9e16e6 | 952 | } |
93531c67 | 953 | |
5bcaa41b DA |
954 | if (rt->rt6i_pcpu) |
955 | fib6_drop_pcpu_from(rt, table); | |
6e9e16e6 HFS |
956 | } |
957 | } | |
958 | ||
1da177e4 LT |
959 | /* |
960 | * Insert routing information in a node. | |
961 | */ | |
962 | ||
8d1c802b | 963 | static int fib6_add_rt2node(struct fib6_node *fn, struct fib6_info *rt, |
d4ead6b3 | 964 | struct nl_info *info, |
6c31e5a9 | 965 | struct netlink_ext_ack *extack) |
1da177e4 | 966 | { |
8d1c802b | 967 | struct fib6_info *leaf = rcu_dereference_protected(fn->leaf, |
93c2fb25 | 968 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
33bd5ac5 | 969 | struct fib6_info *iter = NULL; |
8d1c802b | 970 | struct fib6_info __rcu **ins; |
33bd5ac5 | 971 | struct fib6_info __rcu **fallback_ins = NULL; |
507c9b1e DM |
972 | int replace = (info->nlh && |
973 | (info->nlh->nlmsg_flags & NLM_F_REPLACE)); | |
974 | int add = (!info->nlh || | |
975 | (info->nlh->nlmsg_flags & NLM_F_CREATE)); | |
4a287eba | 976 | int found = 0; |
33bd5ac5 | 977 | bool rt_can_ecmp = rt6_qualify_for_ecmp(rt); |
73483c12 | 978 | u16 nlflags = NLM_F_EXCL; |
e5fd387a | 979 | int err; |
1da177e4 | 980 | |
33bd5ac5 | 981 | if (info->nlh && (info->nlh->nlmsg_flags & NLM_F_APPEND)) |
1f5e29ce DA |
982 | nlflags |= NLM_F_APPEND; |
983 | ||
1da177e4 LT |
984 | ins = &fn->leaf; |
985 | ||
66f5d6ce | 986 | for (iter = leaf; iter; |
8fb11a9a | 987 | iter = rcu_dereference_protected(iter->fib6_next, |
93c2fb25 | 988 | lockdep_is_held(&rt->fib6_table->tb6_lock))) { |
1da177e4 LT |
989 | /* |
990 | * Search for duplicates | |
991 | */ | |
992 | ||
93c2fb25 | 993 | if (iter->fib6_metric == rt->fib6_metric) { |
1da177e4 LT |
994 | /* |
995 | * Same priority level | |
996 | */ | |
507c9b1e DM |
997 | if (info->nlh && |
998 | (info->nlh->nlmsg_flags & NLM_F_EXCL)) | |
4a287eba | 999 | return -EEXIST; |
73483c12 GN |
1000 | |
1001 | nlflags &= ~NLM_F_EXCL; | |
4a287eba | 1002 | if (replace) { |
33bd5ac5 DA |
1003 | if (rt_can_ecmp == rt6_qualify_for_ecmp(iter)) { |
1004 | found++; | |
1005 | break; | |
1006 | } | |
1007 | if (rt_can_ecmp) | |
1008 | fallback_ins = fallback_ins ?: ins; | |
1009 | goto next_iter; | |
4a287eba | 1010 | } |
1da177e4 | 1011 | |
f06b7549 | 1012 | if (rt6_duplicate_nexthop(iter, rt)) { |
93c2fb25 DA |
1013 | if (rt->fib6_nsiblings) |
1014 | rt->fib6_nsiblings = 0; | |
1015 | if (!(iter->fib6_flags & RTF_EXPIRES)) | |
1da177e4 | 1016 | return -EEXIST; |
93c2fb25 | 1017 | if (!(rt->fib6_flags & RTF_EXPIRES)) |
14895687 | 1018 | fib6_clean_expires(iter); |
1716a961 | 1019 | else |
14895687 | 1020 | fib6_set_expires(iter, rt->expires); |
15a81b41 DA |
1021 | |
1022 | if (rt->fib6_pmtu) | |
1023 | fib6_metric_set(iter, RTAX_MTU, | |
1024 | rt->fib6_pmtu); | |
1da177e4 LT |
1025 | return -EEXIST; |
1026 | } | |
33bd5ac5 DA |
1027 | /* If we have the same destination and the same metric, |
1028 | * but not the same gateway, then the route we try to | |
1029 | * add is sibling to this route, increment our counter | |
1030 | * of siblings, and later we will add our route to the | |
1031 | * list. | |
1032 | * Only static routes (which don't have flag | |
1033 | * RTF_EXPIRES) are used for ECMPv6. | |
1034 | * | |
1035 | * To avoid long list, we only had siblings if the | |
1036 | * route have a gateway. | |
1037 | */ | |
1038 | if (rt_can_ecmp && | |
1039 | rt6_qualify_for_ecmp(iter)) | |
1040 | rt->fib6_nsiblings++; | |
1da177e4 LT |
1041 | } |
1042 | ||
93c2fb25 | 1043 | if (iter->fib6_metric > rt->fib6_metric) |
1da177e4 LT |
1044 | break; |
1045 | ||
33bd5ac5 | 1046 | next_iter: |
8fb11a9a | 1047 | ins = &iter->fib6_next; |
27596472 MK |
1048 | } |
1049 | ||
33bd5ac5 DA |
1050 | if (fallback_ins && !found) { |
1051 | /* No ECMP-able route found, replace first non-ECMP one */ | |
1052 | ins = fallback_ins; | |
1053 | iter = rcu_dereference_protected(*ins, | |
1054 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
1055 | found++; | |
1056 | } | |
1057 | ||
f11e6659 DM |
1058 | /* Reset round-robin state, if necessary */ |
1059 | if (ins == &fn->leaf) | |
1060 | fn->rr_ptr = NULL; | |
1061 | ||
51ebd318 | 1062 | /* Link this route to others same route. */ |
33bd5ac5 DA |
1063 | if (rt->fib6_nsiblings) { |
1064 | unsigned int fib6_nsiblings; | |
8d1c802b | 1065 | struct fib6_info *sibling, *temp_sibling; |
51ebd318 | 1066 | |
33bd5ac5 DA |
1067 | /* Find the first route that have the same metric */ |
1068 | sibling = leaf; | |
1069 | while (sibling) { | |
1070 | if (sibling->fib6_metric == rt->fib6_metric && | |
1071 | rt6_qualify_for_ecmp(sibling)) { | |
1072 | list_add_tail(&rt->fib6_siblings, | |
1073 | &sibling->fib6_siblings); | |
1074 | break; | |
1075 | } | |
1076 | sibling = rcu_dereference_protected(sibling->fib6_next, | |
1077 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
51ebd318 ND |
1078 | } |
1079 | /* For each sibling in the list, increment the counter of | |
1080 | * siblings. BUG() if counters does not match, list of siblings | |
1081 | * is broken! | |
1082 | */ | |
33bd5ac5 | 1083 | fib6_nsiblings = 0; |
51ebd318 | 1084 | list_for_each_entry_safe(sibling, temp_sibling, |
33bd5ac5 | 1085 | &rt->fib6_siblings, fib6_siblings) { |
93c2fb25 | 1086 | sibling->fib6_nsiblings++; |
33bd5ac5 DA |
1087 | BUG_ON(sibling->fib6_nsiblings != rt->fib6_nsiblings); |
1088 | fib6_nsiblings++; | |
51ebd318 | 1089 | } |
33bd5ac5 DA |
1090 | BUG_ON(fib6_nsiblings != rt->fib6_nsiblings); |
1091 | rt6_multipath_rebalance(temp_sibling); | |
51ebd318 ND |
1092 | } |
1093 | ||
1da177e4 LT |
1094 | /* |
1095 | * insert node | |
1096 | */ | |
4a287eba MV |
1097 | if (!replace) { |
1098 | if (!add) | |
f3213831 | 1099 | pr_warn("NLM_F_CREATE should be set when creating new route\n"); |
4a287eba MV |
1100 | |
1101 | add: | |
73483c12 | 1102 | nlflags |= NLM_F_CREATE; |
e715b6d3 | 1103 | |
33bd5ac5 DA |
1104 | err = call_fib6_entry_notifiers(info->nl_net, |
1105 | FIB_EVENT_ENTRY_ADD, | |
1106 | rt, extack); | |
2233000c DA |
1107 | if (err) |
1108 | return err; | |
1109 | ||
8fb11a9a | 1110 | rcu_assign_pointer(rt->fib6_next, iter); |
93c2fb25 DA |
1111 | atomic_inc(&rt->fib6_ref); |
1112 | rcu_assign_pointer(rt->fib6_node, fn); | |
66f5d6ce | 1113 | rcu_assign_pointer(*ins, rt); |
3b1137fe DA |
1114 | if (!info->skip_notify) |
1115 | inet6_rt_notify(RTM_NEWROUTE, rt, info, nlflags); | |
4a287eba MV |
1116 | info->nl_net->ipv6.rt6_stats->fib_rt_entries++; |
1117 | ||
507c9b1e | 1118 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
1119 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
1120 | fn->fn_flags |= RTN_RTINFO; | |
1121 | } | |
1da177e4 | 1122 | |
4a287eba | 1123 | } else { |
33bd5ac5 | 1124 | int nsiblings; |
27596472 | 1125 | |
4a287eba MV |
1126 | if (!found) { |
1127 | if (add) | |
1128 | goto add; | |
f3213831 | 1129 | pr_warn("NLM_F_REPLACE set, but no existing node found!\n"); |
4a287eba MV |
1130 | return -ENOENT; |
1131 | } | |
e715b6d3 | 1132 | |
2233000c DA |
1133 | err = call_fib6_entry_notifiers(info->nl_net, |
1134 | FIB_EVENT_ENTRY_REPLACE, | |
1135 | rt, extack); | |
1136 | if (err) | |
1137 | return err; | |
1138 | ||
93c2fb25 DA |
1139 | atomic_inc(&rt->fib6_ref); |
1140 | rcu_assign_pointer(rt->fib6_node, fn); | |
33bd5ac5 | 1141 | rt->fib6_next = iter->fib6_next; |
66f5d6ce | 1142 | rcu_assign_pointer(*ins, rt); |
3b1137fe DA |
1143 | if (!info->skip_notify) |
1144 | inet6_rt_notify(RTM_NEWROUTE, rt, info, NLM_F_REPLACE); | |
507c9b1e | 1145 | if (!(fn->fn_flags & RTN_RTINFO)) { |
4a287eba MV |
1146 | info->nl_net->ipv6.rt6_stats->fib_route_nodes++; |
1147 | fn->fn_flags |= RTN_RTINFO; | |
1148 | } | |
33bd5ac5 DA |
1149 | nsiblings = iter->fib6_nsiblings; |
1150 | iter->fib6_node = NULL; | |
1151 | fib6_purge_rt(iter, fn, info->nl_net); | |
1152 | if (rcu_access_pointer(fn->rr_ptr) == iter) | |
1153 | fn->rr_ptr = NULL; | |
1154 | fib6_info_release(iter); | |
27596472 | 1155 | |
33bd5ac5 | 1156 | if (nsiblings) { |
27596472 | 1157 | /* Replacing an ECMP route, remove all siblings */ |
33bd5ac5 DA |
1158 | ins = &rt->fib6_next; |
1159 | iter = rcu_dereference_protected(*ins, | |
1160 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
1161 | while (iter) { | |
1162 | if (iter->fib6_metric > rt->fib6_metric) | |
1163 | break; | |
1164 | if (rt6_qualify_for_ecmp(iter)) { | |
1165 | *ins = iter->fib6_next; | |
1166 | iter->fib6_node = NULL; | |
1167 | fib6_purge_rt(iter, fn, info->nl_net); | |
1168 | if (rcu_access_pointer(fn->rr_ptr) == iter) | |
1169 | fn->rr_ptr = NULL; | |
1170 | fib6_info_release(iter); | |
1171 | nsiblings--; | |
1172 | info->nl_net->ipv6.rt6_stats->fib_rt_entries--; | |
1173 | } else { | |
1174 | ins = &iter->fib6_next; | |
1175 | } | |
1176 | iter = rcu_dereference_protected(*ins, | |
1177 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
27596472 | 1178 | } |
33bd5ac5 | 1179 | WARN_ON(nsiblings != 0); |
27596472 | 1180 | } |
1da177e4 LT |
1181 | } |
1182 | ||
1183 | return 0; | |
1184 | } | |
1185 | ||
8d1c802b | 1186 | static void fib6_start_gc(struct net *net, struct fib6_info *rt) |
1da177e4 | 1187 | { |
417f28bb | 1188 | if (!timer_pending(&net->ipv6.ip6_fib_timer) && |
93c2fb25 | 1189 | (rt->fib6_flags & RTF_EXPIRES)) |
417f28bb | 1190 | mod_timer(&net->ipv6.ip6_fib_timer, |
847499ce | 1191 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
1192 | } |
1193 | ||
63152fc0 | 1194 | void fib6_force_start_gc(struct net *net) |
1da177e4 | 1195 | { |
417f28bb SH |
1196 | if (!timer_pending(&net->ipv6.ip6_fib_timer)) |
1197 | mod_timer(&net->ipv6.ip6_fib_timer, | |
847499ce | 1198 | jiffies + net->ipv6.sysctl.ip6_rt_gc_interval); |
1da177e4 LT |
1199 | } |
1200 | ||
8d1c802b | 1201 | static void __fib6_update_sernum_upto_root(struct fib6_info *rt, |
4a8e56ee | 1202 | int sernum) |
bbd63f06 | 1203 | { |
93c2fb25 DA |
1204 | struct fib6_node *fn = rcu_dereference_protected(rt->fib6_node, |
1205 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
bbd63f06 WW |
1206 | |
1207 | /* paired with smp_rmb() in rt6_get_cookie_safe() */ | |
1208 | smp_wmb(); | |
1209 | while (fn) { | |
1210 | fn->fn_sernum = sernum; | |
66f5d6ce | 1211 | fn = rcu_dereference_protected(fn->parent, |
93c2fb25 | 1212 | lockdep_is_held(&rt->fib6_table->tb6_lock)); |
bbd63f06 WW |
1213 | } |
1214 | } | |
1215 | ||
8d1c802b | 1216 | void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt) |
4a8e56ee IS |
1217 | { |
1218 | __fib6_update_sernum_upto_root(rt, fib6_new_sernum(net)); | |
1219 | } | |
1220 | ||
1da177e4 LT |
1221 | /* |
1222 | * Add routing information to the routing tree. | |
1223 | * <destination addr>/<source addr> | |
1224 | * with source addr info in sub-trees | |
66f5d6ce | 1225 | * Need to own table->tb6_lock |
1da177e4 LT |
1226 | */ |
1227 | ||
8d1c802b | 1228 | int fib6_add(struct fib6_node *root, struct fib6_info *rt, |
d4ead6b3 | 1229 | struct nl_info *info, struct netlink_ext_ack *extack) |
1da177e4 | 1230 | { |
93c2fb25 | 1231 | struct fib6_table *table = rt->fib6_table; |
66729e18 | 1232 | struct fib6_node *fn, *pn = NULL; |
1da177e4 | 1233 | int err = -ENOMEM; |
4a287eba MV |
1234 | int allow_create = 1; |
1235 | int replace_required = 0; | |
812918c4 | 1236 | int sernum = fib6_new_sernum(info->nl_net); |
507c9b1e DM |
1237 | |
1238 | if (info->nlh) { | |
1239 | if (!(info->nlh->nlmsg_flags & NLM_F_CREATE)) | |
4a287eba | 1240 | allow_create = 0; |
507c9b1e | 1241 | if (info->nlh->nlmsg_flags & NLM_F_REPLACE) |
4a287eba MV |
1242 | replace_required = 1; |
1243 | } | |
1244 | if (!allow_create && !replace_required) | |
f3213831 | 1245 | pr_warn("RTM_NEWROUTE with no NLM_F_CREATE or NLM_F_REPLACE\n"); |
1da177e4 | 1246 | |
81eb8447 | 1247 | fn = fib6_add_1(info->nl_net, table, root, |
93c2fb25 DA |
1248 | &rt->fib6_dst.addr, rt->fib6_dst.plen, |
1249 | offsetof(struct fib6_info, fib6_dst), allow_create, | |
bbd63f06 | 1250 | replace_required, extack); |
4a287eba MV |
1251 | if (IS_ERR(fn)) { |
1252 | err = PTR_ERR(fn); | |
ae7b4e1f | 1253 | fn = NULL; |
1da177e4 | 1254 | goto out; |
188c517a | 1255 | } |
1da177e4 | 1256 | |
66729e18 YH |
1257 | pn = fn; |
1258 | ||
1da177e4 | 1259 | #ifdef CONFIG_IPV6_SUBTREES |
93c2fb25 | 1260 | if (rt->fib6_src.plen) { |
1da177e4 LT |
1261 | struct fib6_node *sn; |
1262 | ||
66f5d6ce | 1263 | if (!rcu_access_pointer(fn->subtree)) { |
1da177e4 LT |
1264 | struct fib6_node *sfn; |
1265 | ||
1266 | /* | |
1267 | * Create subtree. | |
1268 | * | |
1269 | * fn[main tree] | |
1270 | * | | |
1271 | * sfn[subtree root] | |
1272 | * \ | |
1273 | * sn[new leaf node] | |
1274 | */ | |
1275 | ||
1276 | /* Create subtree root node */ | |
81eb8447 | 1277 | sfn = node_alloc(info->nl_net); |
507c9b1e | 1278 | if (!sfn) |
348a4002 | 1279 | goto failure; |
1da177e4 | 1280 | |
93c2fb25 | 1281 | atomic_inc(&info->nl_net->ipv6.fib6_null_entry->fib6_ref); |
66f5d6ce | 1282 | rcu_assign_pointer(sfn->leaf, |
421842ed | 1283 | info->nl_net->ipv6.fib6_null_entry); |
1da177e4 | 1284 | sfn->fn_flags = RTN_ROOT; |
1da177e4 LT |
1285 | |
1286 | /* Now add the first leaf node to new subtree */ | |
1287 | ||
81eb8447 | 1288 | sn = fib6_add_1(info->nl_net, table, sfn, |
93c2fb25 DA |
1289 | &rt->fib6_src.addr, rt->fib6_src.plen, |
1290 | offsetof(struct fib6_info, fib6_src), | |
bbd63f06 | 1291 | allow_create, replace_required, extack); |
1da177e4 | 1292 | |
f950c0ec | 1293 | if (IS_ERR(sn)) { |
1da177e4 | 1294 | /* If it is failed, discard just allocated |
348a4002 | 1295 | root, and then (in failure) stale node |
1da177e4 LT |
1296 | in main tree. |
1297 | */ | |
81eb8447 | 1298 | node_free_immediate(info->nl_net, sfn); |
188c517a | 1299 | err = PTR_ERR(sn); |
348a4002 | 1300 | goto failure; |
1da177e4 LT |
1301 | } |
1302 | ||
1303 | /* Now link new subtree to main tree */ | |
66f5d6ce WW |
1304 | rcu_assign_pointer(sfn->parent, fn); |
1305 | rcu_assign_pointer(fn->subtree, sfn); | |
1da177e4 | 1306 | } else { |
81eb8447 | 1307 | sn = fib6_add_1(info->nl_net, table, FIB6_SUBTREE(fn), |
93c2fb25 DA |
1308 | &rt->fib6_src.addr, rt->fib6_src.plen, |
1309 | offsetof(struct fib6_info, fib6_src), | |
bbd63f06 | 1310 | allow_create, replace_required, extack); |
1da177e4 | 1311 | |
4a287eba MV |
1312 | if (IS_ERR(sn)) { |
1313 | err = PTR_ERR(sn); | |
348a4002 | 1314 | goto failure; |
188c517a | 1315 | } |
1da177e4 LT |
1316 | } |
1317 | ||
66f5d6ce | 1318 | if (!rcu_access_pointer(fn->leaf)) { |
591ff9ea WW |
1319 | if (fn->fn_flags & RTN_TL_ROOT) { |
1320 | /* put back null_entry for root node */ | |
1321 | rcu_assign_pointer(fn->leaf, | |
421842ed | 1322 | info->nl_net->ipv6.fib6_null_entry); |
591ff9ea | 1323 | } else { |
93c2fb25 | 1324 | atomic_inc(&rt->fib6_ref); |
591ff9ea WW |
1325 | rcu_assign_pointer(fn->leaf, rt); |
1326 | } | |
66729e18 | 1327 | } |
1da177e4 LT |
1328 | fn = sn; |
1329 | } | |
1330 | #endif | |
1331 | ||
d4ead6b3 | 1332 | err = fib6_add_rt2node(fn, rt, info, extack); |
bbd63f06 | 1333 | if (!err) { |
4a8e56ee | 1334 | __fib6_update_sernum_upto_root(rt, sernum); |
63152fc0 | 1335 | fib6_start_gc(info->nl_net, rt); |
bbd63f06 | 1336 | } |
1da177e4 LT |
1337 | |
1338 | out: | |
66729e18 YH |
1339 | if (err) { |
1340 | #ifdef CONFIG_IPV6_SUBTREES | |
1341 | /* | |
1342 | * If fib6_add_1 has cleared the old leaf pointer in the | |
1343 | * super-tree leaf node we have to find a new one for it. | |
1344 | */ | |
7bbfe00e | 1345 | if (pn != fn) { |
8d1c802b | 1346 | struct fib6_info *pn_leaf = |
7bbfe00e WW |
1347 | rcu_dereference_protected(pn->leaf, |
1348 | lockdep_is_held(&table->tb6_lock)); | |
1349 | if (pn_leaf == rt) { | |
1350 | pn_leaf = NULL; | |
1351 | RCU_INIT_POINTER(pn->leaf, NULL); | |
93531c67 | 1352 | fib6_info_release(rt); |
66729e18 | 1353 | } |
7bbfe00e WW |
1354 | if (!pn_leaf && !(pn->fn_flags & RTN_RTINFO)) { |
1355 | pn_leaf = fib6_find_prefix(info->nl_net, table, | |
1356 | pn); | |
1357 | #if RT6_DEBUG >= 2 | |
1358 | if (!pn_leaf) { | |
1359 | WARN_ON(!pn_leaf); | |
1360 | pn_leaf = | |
421842ed | 1361 | info->nl_net->ipv6.fib6_null_entry; |
7bbfe00e | 1362 | } |
66729e18 | 1363 | #endif |
93531c67 | 1364 | fib6_info_hold(pn_leaf); |
7bbfe00e WW |
1365 | rcu_assign_pointer(pn->leaf, pn_leaf); |
1366 | } | |
66729e18 YH |
1367 | } |
1368 | #endif | |
348a4002 | 1369 | goto failure; |
66729e18 | 1370 | } |
1da177e4 LT |
1371 | return err; |
1372 | ||
348a4002 | 1373 | failure: |
4512c43e WW |
1374 | /* fn->leaf could be NULL and fib6_repair_tree() needs to be called if: |
1375 | * 1. fn is an intermediate node and we failed to add the new | |
1376 | * route to it in both subtree creation failure and fib6_add_rt2node() | |
1377 | * failure case. | |
1378 | * 2. fn is the root node in the table and we fail to add the first | |
1379 | * default route to it. | |
1da177e4 | 1380 | */ |
4512c43e WW |
1381 | if (fn && |
1382 | (!(fn->fn_flags & (RTN_RTINFO|RTN_ROOT)) || | |
1383 | (fn->fn_flags & RTN_TL_ROOT && | |
1384 | !rcu_access_pointer(fn->leaf)))) | |
66f5d6ce | 1385 | fib6_repair_tree(info->nl_net, table, fn); |
1da177e4 | 1386 | return err; |
1da177e4 LT |
1387 | } |
1388 | ||
1389 | /* | |
1390 | * Routing tree lookup | |
1391 | * | |
1392 | */ | |
1393 | ||
1394 | struct lookup_args { | |
8d1c802b | 1395 | int offset; /* key offset on fib6_info */ |
b71d1d42 | 1396 | const struct in6_addr *addr; /* search key */ |
1da177e4 LT |
1397 | }; |
1398 | ||
6454743b DA |
1399 | static struct fib6_node *fib6_node_lookup_1(struct fib6_node *root, |
1400 | struct lookup_args *args) | |
1da177e4 LT |
1401 | { |
1402 | struct fib6_node *fn; | |
e69a4adc | 1403 | __be32 dir; |
1da177e4 | 1404 | |
825e288e YH |
1405 | if (unlikely(args->offset == 0)) |
1406 | return NULL; | |
1407 | ||
1da177e4 LT |
1408 | /* |
1409 | * Descend on a tree | |
1410 | */ | |
1411 | ||
1412 | fn = root; | |
1413 | ||
1414 | for (;;) { | |
1415 | struct fib6_node *next; | |
1416 | ||
1417 | dir = addr_bit_set(args->addr, fn->fn_bit); | |
1418 | ||
66f5d6ce WW |
1419 | next = dir ? rcu_dereference(fn->right) : |
1420 | rcu_dereference(fn->left); | |
1da177e4 LT |
1421 | |
1422 | if (next) { | |
1423 | fn = next; | |
1424 | continue; | |
1425 | } | |
1da177e4 LT |
1426 | break; |
1427 | } | |
1428 | ||
507c9b1e | 1429 | while (fn) { |
66f5d6ce WW |
1430 | struct fib6_node *subtree = FIB6_SUBTREE(fn); |
1431 | ||
1432 | if (subtree || fn->fn_flags & RTN_RTINFO) { | |
8d1c802b | 1433 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
1da177e4 LT |
1434 | struct rt6key *key; |
1435 | ||
8d1040e8 WW |
1436 | if (!leaf) |
1437 | goto backtrack; | |
1438 | ||
1439 | key = (struct rt6key *) ((u8 *)leaf + args->offset); | |
1da177e4 | 1440 | |
3fc5e044 YH |
1441 | if (ipv6_prefix_equal(&key->addr, args->addr, key->plen)) { |
1442 | #ifdef CONFIG_IPV6_SUBTREES | |
66f5d6ce | 1443 | if (subtree) { |
3e3be275 | 1444 | struct fib6_node *sfn; |
6454743b DA |
1445 | sfn = fib6_node_lookup_1(subtree, |
1446 | args + 1); | |
3e3be275 HFS |
1447 | if (!sfn) |
1448 | goto backtrack; | |
1449 | fn = sfn; | |
1450 | } | |
3fc5e044 | 1451 | #endif |
3e3be275 | 1452 | if (fn->fn_flags & RTN_RTINFO) |
3fc5e044 YH |
1453 | return fn; |
1454 | } | |
1da177e4 | 1455 | } |
3e3be275 | 1456 | backtrack: |
3fc5e044 YH |
1457 | if (fn->fn_flags & RTN_ROOT) |
1458 | break; | |
1459 | ||
66f5d6ce | 1460 | fn = rcu_dereference(fn->parent); |
1da177e4 LT |
1461 | } |
1462 | ||
1463 | return NULL; | |
1464 | } | |
1465 | ||
66f5d6ce WW |
1466 | /* called with rcu_read_lock() held |
1467 | */ | |
6454743b DA |
1468 | struct fib6_node *fib6_node_lookup(struct fib6_node *root, |
1469 | const struct in6_addr *daddr, | |
1470 | const struct in6_addr *saddr) | |
1da177e4 | 1471 | { |
1da177e4 | 1472 | struct fib6_node *fn; |
825e288e YH |
1473 | struct lookup_args args[] = { |
1474 | { | |
93c2fb25 | 1475 | .offset = offsetof(struct fib6_info, fib6_dst), |
825e288e YH |
1476 | .addr = daddr, |
1477 | }, | |
1da177e4 | 1478 | #ifdef CONFIG_IPV6_SUBTREES |
825e288e | 1479 | { |
93c2fb25 | 1480 | .offset = offsetof(struct fib6_info, fib6_src), |
825e288e YH |
1481 | .addr = saddr, |
1482 | }, | |
1da177e4 | 1483 | #endif |
825e288e YH |
1484 | { |
1485 | .offset = 0, /* sentinel */ | |
1486 | } | |
1487 | }; | |
1da177e4 | 1488 | |
6454743b | 1489 | fn = fib6_node_lookup_1(root, daddr ? args : args + 1); |
507c9b1e | 1490 | if (!fn || fn->fn_flags & RTN_TL_ROOT) |
1da177e4 LT |
1491 | fn = root; |
1492 | ||
1493 | return fn; | |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * Get node with specified destination prefix (and source prefix, | |
1498 | * if subtrees are used) | |
38fbeeee WW |
1499 | * exact_match == true means we try to find fn with exact match of |
1500 | * the passed in prefix addr | |
1501 | * exact_match == false means we try to find fn with longest prefix | |
1502 | * match of the passed in prefix addr. This is useful for finding fn | |
1503 | * for cached route as it will be stored in the exception table under | |
1504 | * the node with longest prefix length. | |
1da177e4 LT |
1505 | */ |
1506 | ||
1507 | ||
437de07c WY |
1508 | static struct fib6_node *fib6_locate_1(struct fib6_node *root, |
1509 | const struct in6_addr *addr, | |
38fbeeee WW |
1510 | int plen, int offset, |
1511 | bool exact_match) | |
1da177e4 | 1512 | { |
38fbeeee | 1513 | struct fib6_node *fn, *prev = NULL; |
1da177e4 LT |
1514 | |
1515 | for (fn = root; fn ; ) { | |
8d1c802b | 1516 | struct fib6_info *leaf = rcu_dereference(fn->leaf); |
8d1040e8 WW |
1517 | struct rt6key *key; |
1518 | ||
1519 | /* This node is being deleted */ | |
1520 | if (!leaf) { | |
1521 | if (plen <= fn->fn_bit) | |
1522 | goto out; | |
1523 | else | |
1524 | goto next; | |
1525 | } | |
1526 | ||
1527 | key = (struct rt6key *)((u8 *)leaf + offset); | |
1da177e4 LT |
1528 | |
1529 | /* | |
1530 | * Prefix match | |
1531 | */ | |
1532 | if (plen < fn->fn_bit || | |
1533 | !ipv6_prefix_equal(&key->addr, addr, fn->fn_bit)) | |
38fbeeee | 1534 | goto out; |
1da177e4 LT |
1535 | |
1536 | if (plen == fn->fn_bit) | |
1537 | return fn; | |
1538 | ||
38fbeeee WW |
1539 | prev = fn; |
1540 | ||
8d1040e8 | 1541 | next: |
1da177e4 LT |
1542 | /* |
1543 | * We have more bits to go | |
1544 | */ | |
1545 | if (addr_bit_set(addr, fn->fn_bit)) | |
66f5d6ce | 1546 | fn = rcu_dereference(fn->right); |
1da177e4 | 1547 | else |
66f5d6ce | 1548 | fn = rcu_dereference(fn->left); |
1da177e4 | 1549 | } |
38fbeeee WW |
1550 | out: |
1551 | if (exact_match) | |
1552 | return NULL; | |
1553 | else | |
1554 | return prev; | |
1da177e4 LT |
1555 | } |
1556 | ||
437de07c WY |
1557 | struct fib6_node *fib6_locate(struct fib6_node *root, |
1558 | const struct in6_addr *daddr, int dst_len, | |
38fbeeee WW |
1559 | const struct in6_addr *saddr, int src_len, |
1560 | bool exact_match) | |
1da177e4 LT |
1561 | { |
1562 | struct fib6_node *fn; | |
1563 | ||
1564 | fn = fib6_locate_1(root, daddr, dst_len, | |
93c2fb25 | 1565 | offsetof(struct fib6_info, fib6_dst), |
38fbeeee | 1566 | exact_match); |
1da177e4 LT |
1567 | |
1568 | #ifdef CONFIG_IPV6_SUBTREES | |
1569 | if (src_len) { | |
547b792c | 1570 | WARN_ON(saddr == NULL); |
0e80193b WW |
1571 | if (fn) { |
1572 | struct fib6_node *subtree = FIB6_SUBTREE(fn); | |
1573 | ||
1574 | if (subtree) { | |
1575 | fn = fib6_locate_1(subtree, saddr, src_len, | |
93c2fb25 | 1576 | offsetof(struct fib6_info, fib6_src), |
38fbeeee | 1577 | exact_match); |
0e80193b WW |
1578 | } |
1579 | } | |
1da177e4 LT |
1580 | } |
1581 | #endif | |
1582 | ||
507c9b1e | 1583 | if (fn && fn->fn_flags & RTN_RTINFO) |
1da177e4 LT |
1584 | return fn; |
1585 | ||
1586 | return NULL; | |
1587 | } | |
1588 | ||
1589 | ||
1590 | /* | |
1591 | * Deletion | |
1592 | * | |
1593 | */ | |
1594 | ||
8d1c802b | 1595 | static struct fib6_info *fib6_find_prefix(struct net *net, |
66f5d6ce WW |
1596 | struct fib6_table *table, |
1597 | struct fib6_node *fn) | |
1da177e4 | 1598 | { |
66f5d6ce WW |
1599 | struct fib6_node *child_left, *child_right; |
1600 | ||
507c9b1e | 1601 | if (fn->fn_flags & RTN_ROOT) |
421842ed | 1602 | return net->ipv6.fib6_null_entry; |
1da177e4 | 1603 | |
507c9b1e | 1604 | while (fn) { |
66f5d6ce WW |
1605 | child_left = rcu_dereference_protected(fn->left, |
1606 | lockdep_is_held(&table->tb6_lock)); | |
1607 | child_right = rcu_dereference_protected(fn->right, | |
1608 | lockdep_is_held(&table->tb6_lock)); | |
1609 | if (child_left) | |
1610 | return rcu_dereference_protected(child_left->leaf, | |
1611 | lockdep_is_held(&table->tb6_lock)); | |
1612 | if (child_right) | |
1613 | return rcu_dereference_protected(child_right->leaf, | |
1614 | lockdep_is_held(&table->tb6_lock)); | |
1da177e4 | 1615 | |
7fc33165 | 1616 | fn = FIB6_SUBTREE(fn); |
1da177e4 LT |
1617 | } |
1618 | return NULL; | |
1619 | } | |
1620 | ||
1621 | /* | |
1622 | * Called to trim the tree of intermediate nodes when possible. "fn" | |
1623 | * is the node we want to try and remove. | |
66f5d6ce | 1624 | * Need to own table->tb6_lock |
1da177e4 LT |
1625 | */ |
1626 | ||
8ed67789 | 1627 | static struct fib6_node *fib6_repair_tree(struct net *net, |
66f5d6ce WW |
1628 | struct fib6_table *table, |
1629 | struct fib6_node *fn) | |
1da177e4 LT |
1630 | { |
1631 | int children; | |
1632 | int nstate; | |
66f5d6ce | 1633 | struct fib6_node *child; |
94b2cfe0 | 1634 | struct fib6_walker *w; |
1da177e4 LT |
1635 | int iter = 0; |
1636 | ||
4512c43e WW |
1637 | /* Set fn->leaf to null_entry for root node. */ |
1638 | if (fn->fn_flags & RTN_TL_ROOT) { | |
421842ed | 1639 | rcu_assign_pointer(fn->leaf, net->ipv6.fib6_null_entry); |
4512c43e WW |
1640 | return fn; |
1641 | } | |
1642 | ||
1da177e4 | 1643 | for (;;) { |
66f5d6ce WW |
1644 | struct fib6_node *fn_r = rcu_dereference_protected(fn->right, |
1645 | lockdep_is_held(&table->tb6_lock)); | |
1646 | struct fib6_node *fn_l = rcu_dereference_protected(fn->left, | |
1647 | lockdep_is_held(&table->tb6_lock)); | |
1648 | struct fib6_node *pn = rcu_dereference_protected(fn->parent, | |
1649 | lockdep_is_held(&table->tb6_lock)); | |
1650 | struct fib6_node *pn_r = rcu_dereference_protected(pn->right, | |
1651 | lockdep_is_held(&table->tb6_lock)); | |
1652 | struct fib6_node *pn_l = rcu_dereference_protected(pn->left, | |
1653 | lockdep_is_held(&table->tb6_lock)); | |
8d1c802b | 1654 | struct fib6_info *fn_leaf = rcu_dereference_protected(fn->leaf, |
66f5d6ce | 1655 | lockdep_is_held(&table->tb6_lock)); |
8d1c802b | 1656 | struct fib6_info *pn_leaf = rcu_dereference_protected(pn->leaf, |
66f5d6ce | 1657 | lockdep_is_held(&table->tb6_lock)); |
8d1c802b | 1658 | struct fib6_info *new_fn_leaf; |
66f5d6ce | 1659 | |
1da177e4 LT |
1660 | RT6_TRACE("fixing tree: plen=%d iter=%d\n", fn->fn_bit, iter); |
1661 | iter++; | |
1662 | ||
547b792c IJ |
1663 | WARN_ON(fn->fn_flags & RTN_RTINFO); |
1664 | WARN_ON(fn->fn_flags & RTN_TL_ROOT); | |
66f5d6ce | 1665 | WARN_ON(fn_leaf); |
1da177e4 LT |
1666 | |
1667 | children = 0; | |
1668 | child = NULL; | |
66f5d6ce WW |
1669 | if (fn_r) |
1670 | child = fn_r, children |= 1; | |
1671 | if (fn_l) | |
1672 | child = fn_l, children |= 2; | |
1da177e4 | 1673 | |
7fc33165 | 1674 | if (children == 3 || FIB6_SUBTREE(fn) |
1da177e4 LT |
1675 | #ifdef CONFIG_IPV6_SUBTREES |
1676 | /* Subtree root (i.e. fn) may have one child */ | |
507c9b1e | 1677 | || (children && fn->fn_flags & RTN_ROOT) |
1da177e4 LT |
1678 | #endif |
1679 | ) { | |
66f5d6ce | 1680 | new_fn_leaf = fib6_find_prefix(net, table, fn); |
1da177e4 | 1681 | #if RT6_DEBUG >= 2 |
66f5d6ce WW |
1682 | if (!new_fn_leaf) { |
1683 | WARN_ON(!new_fn_leaf); | |
421842ed | 1684 | new_fn_leaf = net->ipv6.fib6_null_entry; |
1da177e4 LT |
1685 | } |
1686 | #endif | |
93531c67 | 1687 | fib6_info_hold(new_fn_leaf); |
66f5d6ce WW |
1688 | rcu_assign_pointer(fn->leaf, new_fn_leaf); |
1689 | return pn; | |
1da177e4 LT |
1690 | } |
1691 | ||
1da177e4 | 1692 | #ifdef CONFIG_IPV6_SUBTREES |
7fc33165 | 1693 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1694 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
66f5d6ce | 1695 | RCU_INIT_POINTER(pn->subtree, NULL); |
1da177e4 LT |
1696 | nstate = FWS_L; |
1697 | } else { | |
547b792c | 1698 | WARN_ON(fn->fn_flags & RTN_ROOT); |
1da177e4 | 1699 | #endif |
66f5d6ce WW |
1700 | if (pn_r == fn) |
1701 | rcu_assign_pointer(pn->right, child); | |
1702 | else if (pn_l == fn) | |
1703 | rcu_assign_pointer(pn->left, child); | |
1da177e4 | 1704 | #if RT6_DEBUG >= 2 |
547b792c IJ |
1705 | else |
1706 | WARN_ON(1); | |
1da177e4 LT |
1707 | #endif |
1708 | if (child) | |
66f5d6ce | 1709 | rcu_assign_pointer(child->parent, pn); |
1da177e4 LT |
1710 | nstate = FWS_R; |
1711 | #ifdef CONFIG_IPV6_SUBTREES | |
1712 | } | |
1713 | #endif | |
1714 | ||
9a03cd8f MK |
1715 | read_lock(&net->ipv6.fib6_walker_lock); |
1716 | FOR_WALKERS(net, w) { | |
507c9b1e | 1717 | if (!child) { |
2b760fcf | 1718 | if (w->node == fn) { |
1da177e4 LT |
1719 | RT6_TRACE("W %p adjusted by delnode 1, s=%d/%d\n", w, w->state, nstate); |
1720 | w->node = pn; | |
1721 | w->state = nstate; | |
1722 | } | |
1723 | } else { | |
1da177e4 LT |
1724 | if (w->node == fn) { |
1725 | w->node = child; | |
1726 | if (children&2) { | |
1727 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
8db46f1d | 1728 | w->state = w->state >= FWS_R ? FWS_U : FWS_INIT; |
1da177e4 LT |
1729 | } else { |
1730 | RT6_TRACE("W %p adjusted by delnode 2, s=%d\n", w, w->state); | |
8db46f1d | 1731 | w->state = w->state >= FWS_C ? FWS_U : FWS_INIT; |
1da177e4 LT |
1732 | } |
1733 | } | |
1734 | } | |
1735 | } | |
9a03cd8f | 1736 | read_unlock(&net->ipv6.fib6_walker_lock); |
1da177e4 | 1737 | |
81eb8447 | 1738 | node_free(net, fn); |
507c9b1e | 1739 | if (pn->fn_flags & RTN_RTINFO || FIB6_SUBTREE(pn)) |
1da177e4 LT |
1740 | return pn; |
1741 | ||
66f5d6ce | 1742 | RCU_INIT_POINTER(pn->leaf, NULL); |
93531c67 | 1743 | fib6_info_release(pn_leaf); |
1da177e4 LT |
1744 | fn = pn; |
1745 | } | |
1746 | } | |
1747 | ||
66f5d6ce | 1748 | static void fib6_del_route(struct fib6_table *table, struct fib6_node *fn, |
8d1c802b | 1749 | struct fib6_info __rcu **rtp, struct nl_info *info) |
1da177e4 | 1750 | { |
94b2cfe0 | 1751 | struct fib6_walker *w; |
8d1c802b | 1752 | struct fib6_info *rt = rcu_dereference_protected(*rtp, |
66f5d6ce | 1753 | lockdep_is_held(&table->tb6_lock)); |
c572872f | 1754 | struct net *net = info->nl_net; |
1da177e4 LT |
1755 | |
1756 | RT6_TRACE("fib6_del_route\n"); | |
1757 | ||
1758 | /* Unlink it */ | |
8fb11a9a | 1759 | *rtp = rt->fib6_next; |
93c2fb25 | 1760 | rt->fib6_node = NULL; |
c572872f BT |
1761 | net->ipv6.rt6_stats->fib_rt_entries--; |
1762 | net->ipv6.rt6_stats->fib_discarded_routes++; | |
1da177e4 | 1763 | |
2b760fcf WW |
1764 | /* Flush all cached dst in exception table */ |
1765 | rt6_flush_exceptions(rt); | |
1766 | ||
f11e6659 | 1767 | /* Reset round-robin state, if necessary */ |
66f5d6ce | 1768 | if (rcu_access_pointer(fn->rr_ptr) == rt) |
f11e6659 DM |
1769 | fn->rr_ptr = NULL; |
1770 | ||
51ebd318 | 1771 | /* Remove this entry from other siblings */ |
93c2fb25 | 1772 | if (rt->fib6_nsiblings) { |
8d1c802b | 1773 | struct fib6_info *sibling, *next_sibling; |
51ebd318 ND |
1774 | |
1775 | list_for_each_entry_safe(sibling, next_sibling, | |
93c2fb25 DA |
1776 | &rt->fib6_siblings, fib6_siblings) |
1777 | sibling->fib6_nsiblings--; | |
1778 | rt->fib6_nsiblings = 0; | |
1779 | list_del_init(&rt->fib6_siblings); | |
d7dedee1 | 1780 | rt6_multipath_rebalance(next_sibling); |
51ebd318 ND |
1781 | } |
1782 | ||
1da177e4 | 1783 | /* Adjust walkers */ |
9a03cd8f MK |
1784 | read_lock(&net->ipv6.fib6_walker_lock); |
1785 | FOR_WALKERS(net, w) { | |
1da177e4 LT |
1786 | if (w->state == FWS_C && w->leaf == rt) { |
1787 | RT6_TRACE("walker %p adjusted by delroute\n", w); | |
8fb11a9a | 1788 | w->leaf = rcu_dereference_protected(rt->fib6_next, |
66f5d6ce | 1789 | lockdep_is_held(&table->tb6_lock)); |
507c9b1e | 1790 | if (!w->leaf) |
1da177e4 LT |
1791 | w->state = FWS_U; |
1792 | } | |
1793 | } | |
9a03cd8f | 1794 | read_unlock(&net->ipv6.fib6_walker_lock); |
1da177e4 | 1795 | |
4512c43e WW |
1796 | /* If it was last route, call fib6_repair_tree() to: |
1797 | * 1. For root node, put back null_entry as how the table was created. | |
1798 | * 2. For other nodes, expunge its radix tree node. | |
1799 | */ | |
66f5d6ce | 1800 | if (!rcu_access_pointer(fn->leaf)) { |
4512c43e WW |
1801 | if (!(fn->fn_flags & RTN_TL_ROOT)) { |
1802 | fn->fn_flags &= ~RTN_RTINFO; | |
1803 | net->ipv6.rt6_stats->fib_route_nodes--; | |
1804 | } | |
66f5d6ce | 1805 | fn = fib6_repair_tree(net, table, fn); |
1da177e4 LT |
1806 | } |
1807 | ||
6e9e16e6 | 1808 | fib6_purge_rt(rt, fn, net); |
1da177e4 | 1809 | |
6c31e5a9 | 1810 | call_fib6_entry_notifiers(net, FIB_EVENT_ENTRY_DEL, rt, NULL); |
16a16cd3 DA |
1811 | if (!info->skip_notify) |
1812 | inet6_rt_notify(RTM_DELROUTE, rt, info, 0); | |
93531c67 | 1813 | fib6_info_release(rt); |
1da177e4 LT |
1814 | } |
1815 | ||
66f5d6ce | 1816 | /* Need to own table->tb6_lock */ |
8d1c802b | 1817 | int fib6_del(struct fib6_info *rt, struct nl_info *info) |
1da177e4 | 1818 | { |
93c2fb25 DA |
1819 | struct fib6_node *fn = rcu_dereference_protected(rt->fib6_node, |
1820 | lockdep_is_held(&rt->fib6_table->tb6_lock)); | |
1821 | struct fib6_table *table = rt->fib6_table; | |
8ed67789 | 1822 | struct net *net = info->nl_net; |
8d1c802b DA |
1823 | struct fib6_info __rcu **rtp; |
1824 | struct fib6_info __rcu **rtp_next; | |
1da177e4 | 1825 | |
421842ed | 1826 | if (!fn || rt == net->ipv6.fib6_null_entry) |
1da177e4 LT |
1827 | return -ENOENT; |
1828 | ||
547b792c | 1829 | WARN_ON(!(fn->fn_flags & RTN_RTINFO)); |
1da177e4 | 1830 | |
1da177e4 LT |
1831 | /* |
1832 | * Walk the leaf entries looking for ourself | |
1833 | */ | |
1834 | ||
66f5d6ce | 1835 | for (rtp = &fn->leaf; *rtp; rtp = rtp_next) { |
8d1c802b | 1836 | struct fib6_info *cur = rcu_dereference_protected(*rtp, |
66f5d6ce WW |
1837 | lockdep_is_held(&table->tb6_lock)); |
1838 | if (rt == cur) { | |
1839 | fib6_del_route(table, fn, rtp, info); | |
1da177e4 LT |
1840 | return 0; |
1841 | } | |
8fb11a9a | 1842 | rtp_next = &cur->fib6_next; |
1da177e4 LT |
1843 | } |
1844 | return -ENOENT; | |
1845 | } | |
1846 | ||
1847 | /* | |
1848 | * Tree traversal function. | |
1849 | * | |
1850 | * Certainly, it is not interrupt safe. | |
1851 | * However, it is internally reenterable wrt itself and fib6_add/fib6_del. | |
1852 | * It means, that we can modify tree during walking | |
1853 | * and use this function for garbage collection, clone pruning, | |
1ab1457c | 1854 | * cleaning tree when a device goes down etc. etc. |
1da177e4 LT |
1855 | * |
1856 | * It guarantees that every node will be traversed, | |
1857 | * and that it will be traversed only once. | |
1858 | * | |
1859 | * Callback function w->func may return: | |
1860 | * 0 -> continue walking. | |
1861 | * positive value -> walking is suspended (used by tree dumps, | |
1862 | * and probably by gc, if it will be split to several slices) | |
1863 | * negative value -> terminate walking. | |
1864 | * | |
1865 | * The function itself returns: | |
1866 | * 0 -> walk is complete. | |
1867 | * >0 -> walk is incomplete (i.e. suspended) | |
1868 | * <0 -> walk is terminated by an error. | |
66f5d6ce WW |
1869 | * |
1870 | * This function is called with tb6_lock held. | |
1da177e4 LT |
1871 | */ |
1872 | ||
94b2cfe0 | 1873 | static int fib6_walk_continue(struct fib6_walker *w) |
1da177e4 | 1874 | { |
66f5d6ce | 1875 | struct fib6_node *fn, *pn, *left, *right; |
1da177e4 | 1876 | |
2b760fcf WW |
1877 | /* w->root should always be table->tb6_root */ |
1878 | WARN_ON_ONCE(!(w->root->fn_flags & RTN_TL_ROOT)); | |
1879 | ||
1da177e4 LT |
1880 | for (;;) { |
1881 | fn = w->node; | |
507c9b1e | 1882 | if (!fn) |
1da177e4 LT |
1883 | return 0; |
1884 | ||
1da177e4 LT |
1885 | switch (w->state) { |
1886 | #ifdef CONFIG_IPV6_SUBTREES | |
1887 | case FWS_S: | |
7fc33165 YH |
1888 | if (FIB6_SUBTREE(fn)) { |
1889 | w->node = FIB6_SUBTREE(fn); | |
1da177e4 LT |
1890 | continue; |
1891 | } | |
1892 | w->state = FWS_L; | |
1ab1457c | 1893 | #endif |
275757e6 | 1894 | /* fall through */ |
1da177e4 | 1895 | case FWS_L: |
66f5d6ce WW |
1896 | left = rcu_dereference_protected(fn->left, 1); |
1897 | if (left) { | |
1898 | w->node = left; | |
1da177e4 LT |
1899 | w->state = FWS_INIT; |
1900 | continue; | |
1901 | } | |
1902 | w->state = FWS_R; | |
275757e6 | 1903 | /* fall through */ |
1da177e4 | 1904 | case FWS_R: |
66f5d6ce WW |
1905 | right = rcu_dereference_protected(fn->right, 1); |
1906 | if (right) { | |
1907 | w->node = right; | |
1da177e4 LT |
1908 | w->state = FWS_INIT; |
1909 | continue; | |
1910 | } | |
1911 | w->state = FWS_C; | |
66f5d6ce | 1912 | w->leaf = rcu_dereference_protected(fn->leaf, 1); |
275757e6 | 1913 | /* fall through */ |
1da177e4 | 1914 | case FWS_C: |
507c9b1e | 1915 | if (w->leaf && fn->fn_flags & RTN_RTINFO) { |
2bec5a36 PM |
1916 | int err; |
1917 | ||
fa809e2f ED |
1918 | if (w->skip) { |
1919 | w->skip--; | |
1c265854 | 1920 | goto skip; |
2bec5a36 PM |
1921 | } |
1922 | ||
1923 | err = w->func(w); | |
1da177e4 LT |
1924 | if (err) |
1925 | return err; | |
2bec5a36 PM |
1926 | |
1927 | w->count++; | |
1da177e4 LT |
1928 | continue; |
1929 | } | |
1c265854 | 1930 | skip: |
1da177e4 | 1931 | w->state = FWS_U; |
275757e6 | 1932 | /* fall through */ |
1da177e4 LT |
1933 | case FWS_U: |
1934 | if (fn == w->root) | |
1935 | return 0; | |
66f5d6ce WW |
1936 | pn = rcu_dereference_protected(fn->parent, 1); |
1937 | left = rcu_dereference_protected(pn->left, 1); | |
1938 | right = rcu_dereference_protected(pn->right, 1); | |
1da177e4 LT |
1939 | w->node = pn; |
1940 | #ifdef CONFIG_IPV6_SUBTREES | |
7fc33165 | 1941 | if (FIB6_SUBTREE(pn) == fn) { |
547b792c | 1942 | WARN_ON(!(fn->fn_flags & RTN_ROOT)); |
1da177e4 LT |
1943 | w->state = FWS_L; |
1944 | continue; | |
1945 | } | |
1946 | #endif | |
66f5d6ce | 1947 | if (left == fn) { |
1da177e4 LT |
1948 | w->state = FWS_R; |
1949 | continue; | |
1950 | } | |
66f5d6ce | 1951 | if (right == fn) { |
1da177e4 | 1952 | w->state = FWS_C; |
66f5d6ce | 1953 | w->leaf = rcu_dereference_protected(w->node->leaf, 1); |
1da177e4 LT |
1954 | continue; |
1955 | } | |
1956 | #if RT6_DEBUG >= 2 | |
547b792c | 1957 | WARN_ON(1); |
1da177e4 LT |
1958 | #endif |
1959 | } | |
1960 | } | |
1961 | } | |
1962 | ||
9a03cd8f | 1963 | static int fib6_walk(struct net *net, struct fib6_walker *w) |
1da177e4 LT |
1964 | { |
1965 | int res; | |
1966 | ||
1967 | w->state = FWS_INIT; | |
1968 | w->node = w->root; | |
1969 | ||
9a03cd8f | 1970 | fib6_walker_link(net, w); |
1da177e4 LT |
1971 | res = fib6_walk_continue(w); |
1972 | if (res <= 0) | |
9a03cd8f | 1973 | fib6_walker_unlink(net, w); |
1da177e4 LT |
1974 | return res; |
1975 | } | |
1976 | ||
94b2cfe0 | 1977 | static int fib6_clean_node(struct fib6_walker *w) |
1da177e4 LT |
1978 | { |
1979 | int res; | |
8d1c802b | 1980 | struct fib6_info *rt; |
94b2cfe0 | 1981 | struct fib6_cleaner *c = container_of(w, struct fib6_cleaner, w); |
ec7d43c2 BT |
1982 | struct nl_info info = { |
1983 | .nl_net = c->net, | |
7c6bb7d2 | 1984 | .skip_notify = c->skip_notify, |
ec7d43c2 | 1985 | }; |
1da177e4 | 1986 | |
327571cb HFS |
1987 | if (c->sernum != FIB6_NO_SERNUM_CHANGE && |
1988 | w->node->fn_sernum != c->sernum) | |
1989 | w->node->fn_sernum = c->sernum; | |
1990 | ||
1991 | if (!c->func) { | |
1992 | WARN_ON_ONCE(c->sernum == FIB6_NO_SERNUM_CHANGE); | |
1993 | w->leaf = NULL; | |
1994 | return 0; | |
1995 | } | |
1996 | ||
66f5d6ce | 1997 | for_each_fib6_walker_rt(w) { |
1da177e4 | 1998 | res = c->func(rt, c->arg); |
b5cb5a75 | 1999 | if (res == -1) { |
1da177e4 | 2000 | w->leaf = rt; |
528c4ceb | 2001 | res = fib6_del(rt, &info); |
1da177e4 LT |
2002 | if (res) { |
2003 | #if RT6_DEBUG >= 2 | |
91df42be | 2004 | pr_debug("%s: del failed: rt=%p@%p err=%d\n", |
4e587ea7 | 2005 | __func__, rt, |
93c2fb25 | 2006 | rcu_access_pointer(rt->fib6_node), |
4e587ea7 | 2007 | res); |
1da177e4 LT |
2008 | #endif |
2009 | continue; | |
2010 | } | |
2011 | return 0; | |
b5cb5a75 | 2012 | } else if (res == -2) { |
93c2fb25 | 2013 | if (WARN_ON(!rt->fib6_nsiblings)) |
b5cb5a75 | 2014 | continue; |
93c2fb25 DA |
2015 | rt = list_last_entry(&rt->fib6_siblings, |
2016 | struct fib6_info, fib6_siblings); | |
b5cb5a75 | 2017 | continue; |
1da177e4 | 2018 | } |
547b792c | 2019 | WARN_ON(res != 0); |
1da177e4 LT |
2020 | } |
2021 | w->leaf = rt; | |
2022 | return 0; | |
2023 | } | |
2024 | ||
2025 | /* | |
2026 | * Convenient frontend to tree walker. | |
1ab1457c | 2027 | * |
1da177e4 | 2028 | * func is called on each route. |
b5cb5a75 IS |
2029 | * It may return -2 -> skip multipath route. |
2030 | * -1 -> delete this route. | |
1da177e4 | 2031 | * 0 -> continue walking |
1da177e4 LT |
2032 | */ |
2033 | ||
ec7d43c2 | 2034 | static void fib6_clean_tree(struct net *net, struct fib6_node *root, |
8d1c802b | 2035 | int (*func)(struct fib6_info *, void *arg), |
7c6bb7d2 | 2036 | int sernum, void *arg, bool skip_notify) |
1da177e4 | 2037 | { |
94b2cfe0 | 2038 | struct fib6_cleaner c; |
1da177e4 LT |
2039 | |
2040 | c.w.root = root; | |
2041 | c.w.func = fib6_clean_node; | |
2bec5a36 PM |
2042 | c.w.count = 0; |
2043 | c.w.skip = 0; | |
1da177e4 | 2044 | c.func = func; |
327571cb | 2045 | c.sernum = sernum; |
1da177e4 | 2046 | c.arg = arg; |
ec7d43c2 | 2047 | c.net = net; |
7c6bb7d2 | 2048 | c.skip_notify = skip_notify; |
1da177e4 | 2049 | |
9a03cd8f | 2050 | fib6_walk(net, &c.w); |
1da177e4 LT |
2051 | } |
2052 | ||
327571cb | 2053 | static void __fib6_clean_all(struct net *net, |
8d1c802b | 2054 | int (*func)(struct fib6_info *, void *), |
7c6bb7d2 | 2055 | int sernum, void *arg, bool skip_notify) |
c71099ac | 2056 | { |
c71099ac | 2057 | struct fib6_table *table; |
58f09b78 | 2058 | struct hlist_head *head; |
1b43af54 | 2059 | unsigned int h; |
c71099ac | 2060 | |
1b43af54 | 2061 | rcu_read_lock(); |
a33bc5c1 | 2062 | for (h = 0; h < FIB6_TABLE_HASHSZ; h++) { |
f3db4851 | 2063 | head = &net->ipv6.fib_table_hash[h]; |
b67bfe0d | 2064 | hlist_for_each_entry_rcu(table, head, tb6_hlist) { |
66f5d6ce | 2065 | spin_lock_bh(&table->tb6_lock); |
ec7d43c2 | 2066 | fib6_clean_tree(net, &table->tb6_root, |
7c6bb7d2 | 2067 | func, sernum, arg, skip_notify); |
66f5d6ce | 2068 | spin_unlock_bh(&table->tb6_lock); |
c71099ac TG |
2069 | } |
2070 | } | |
1b43af54 | 2071 | rcu_read_unlock(); |
c71099ac TG |
2072 | } |
2073 | ||
8d1c802b | 2074 | void fib6_clean_all(struct net *net, int (*func)(struct fib6_info *, void *), |
327571cb HFS |
2075 | void *arg) |
2076 | { | |
7c6bb7d2 DA |
2077 | __fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg, false); |
2078 | } | |
2079 | ||
2080 | void fib6_clean_all_skip_notify(struct net *net, | |
2081 | int (*func)(struct fib6_info *, void *), | |
2082 | void *arg) | |
2083 | { | |
2084 | __fib6_clean_all(net, func, FIB6_NO_SERNUM_CHANGE, arg, true); | |
327571cb HFS |
2085 | } |
2086 | ||
705f1c86 HFS |
2087 | static void fib6_flush_trees(struct net *net) |
2088 | { | |
812918c4 | 2089 | int new_sernum = fib6_new_sernum(net); |
705f1c86 | 2090 | |
7c6bb7d2 | 2091 | __fib6_clean_all(net, NULL, new_sernum, NULL, false); |
705f1c86 HFS |
2092 | } |
2093 | ||
1da177e4 LT |
2094 | /* |
2095 | * Garbage collection | |
2096 | */ | |
2097 | ||
8d1c802b | 2098 | static int fib6_age(struct fib6_info *rt, void *arg) |
1da177e4 | 2099 | { |
3570df91 | 2100 | struct fib6_gc_args *gc_args = arg; |
1da177e4 LT |
2101 | unsigned long now = jiffies; |
2102 | ||
2103 | /* | |
2104 | * check addrconf expiration here. | |
2105 | * Routes are expired even if they are in use. | |
1da177e4 LT |
2106 | */ |
2107 | ||
93c2fb25 | 2108 | if (rt->fib6_flags & RTF_EXPIRES && rt->expires) { |
14895687 | 2109 | if (time_after(now, rt->expires)) { |
1da177e4 | 2110 | RT6_TRACE("expiring %p\n", rt); |
1da177e4 LT |
2111 | return -1; |
2112 | } | |
3570df91 | 2113 | gc_args->more++; |
1da177e4 LT |
2114 | } |
2115 | ||
c757faa8 WW |
2116 | /* Also age clones in the exception table. |
2117 | * Note, that clones are aged out | |
2118 | * only if they are not in use now. | |
2119 | */ | |
2120 | rt6_age_exceptions(rt, gc_args, now); | |
2121 | ||
1da177e4 LT |
2122 | return 0; |
2123 | } | |
2124 | ||
2ac3ac8f | 2125 | void fib6_run_gc(unsigned long expires, struct net *net, bool force) |
1da177e4 | 2126 | { |
3570df91 | 2127 | struct fib6_gc_args gc_args; |
49a18d86 MK |
2128 | unsigned long now; |
2129 | ||
2ac3ac8f | 2130 | if (force) { |
3dc94f93 MK |
2131 | spin_lock_bh(&net->ipv6.fib6_gc_lock); |
2132 | } else if (!spin_trylock_bh(&net->ipv6.fib6_gc_lock)) { | |
2ac3ac8f MK |
2133 | mod_timer(&net->ipv6.ip6_fib_timer, jiffies + HZ); |
2134 | return; | |
1da177e4 | 2135 | } |
2ac3ac8f MK |
2136 | gc_args.timeout = expires ? (int)expires : |
2137 | net->ipv6.sysctl.ip6_rt_gc_interval; | |
db916649 | 2138 | gc_args.more = 0; |
f3db4851 | 2139 | |
3570df91 | 2140 | fib6_clean_all(net, fib6_age, &gc_args); |
49a18d86 MK |
2141 | now = jiffies; |
2142 | net->ipv6.ip6_rt_last_gc = now; | |
1da177e4 LT |
2143 | |
2144 | if (gc_args.more) | |
c8a45222 | 2145 | mod_timer(&net->ipv6.ip6_fib_timer, |
49a18d86 | 2146 | round_jiffies(now |
c8a45222 | 2147 | + net->ipv6.sysctl.ip6_rt_gc_interval)); |
417f28bb SH |
2148 | else |
2149 | del_timer(&net->ipv6.ip6_fib_timer); | |
3dc94f93 | 2150 | spin_unlock_bh(&net->ipv6.fib6_gc_lock); |
1da177e4 LT |
2151 | } |
2152 | ||
86cb30ec | 2153 | static void fib6_gc_timer_cb(struct timer_list *t) |
5b7c931d | 2154 | { |
86cb30ec KC |
2155 | struct net *arg = from_timer(arg, t, ipv6.ip6_fib_timer); |
2156 | ||
2157 | fib6_run_gc(0, arg, true); | |
5b7c931d DL |
2158 | } |
2159 | ||
2c8c1e72 | 2160 | static int __net_init fib6_net_init(struct net *net) |
1da177e4 | 2161 | { |
10da66f7 | 2162 | size_t size = sizeof(struct hlist_head) * FIB6_TABLE_HASHSZ; |
16ab6d7d IS |
2163 | int err; |
2164 | ||
2165 | err = fib6_notifier_init(net); | |
2166 | if (err) | |
2167 | return err; | |
10da66f7 | 2168 | |
3dc94f93 | 2169 | spin_lock_init(&net->ipv6.fib6_gc_lock); |
9a03cd8f MK |
2170 | rwlock_init(&net->ipv6.fib6_walker_lock); |
2171 | INIT_LIST_HEAD(&net->ipv6.fib6_walkers); | |
86cb30ec | 2172 | timer_setup(&net->ipv6.ip6_fib_timer, fib6_gc_timer_cb, 0); |
63152fc0 | 2173 | |
c572872f BT |
2174 | net->ipv6.rt6_stats = kzalloc(sizeof(*net->ipv6.rt6_stats), GFP_KERNEL); |
2175 | if (!net->ipv6.rt6_stats) | |
2176 | goto out_timer; | |
2177 | ||
10da66f7 ED |
2178 | /* Avoid false sharing : Use at least a full cache line */ |
2179 | size = max_t(size_t, size, L1_CACHE_BYTES); | |
2180 | ||
2181 | net->ipv6.fib_table_hash = kzalloc(size, GFP_KERNEL); | |
58f09b78 | 2182 | if (!net->ipv6.fib_table_hash) |
c572872f | 2183 | goto out_rt6_stats; |
e0b85590 | 2184 | |
58f09b78 DL |
2185 | net->ipv6.fib6_main_tbl = kzalloc(sizeof(*net->ipv6.fib6_main_tbl), |
2186 | GFP_KERNEL); | |
2187 | if (!net->ipv6.fib6_main_tbl) | |
e0b85590 DL |
2188 | goto out_fib_table_hash; |
2189 | ||
58f09b78 | 2190 | net->ipv6.fib6_main_tbl->tb6_id = RT6_TABLE_MAIN; |
66f5d6ce | 2191 | rcu_assign_pointer(net->ipv6.fib6_main_tbl->tb6_root.leaf, |
421842ed | 2192 | net->ipv6.fib6_null_entry); |
58f09b78 DL |
2193 | net->ipv6.fib6_main_tbl->tb6_root.fn_flags = |
2194 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 2195 | inet_peer_base_init(&net->ipv6.fib6_main_tbl->tb6_peers); |
e0b85590 DL |
2196 | |
2197 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES | |
58f09b78 DL |
2198 | net->ipv6.fib6_local_tbl = kzalloc(sizeof(*net->ipv6.fib6_local_tbl), |
2199 | GFP_KERNEL); | |
2200 | if (!net->ipv6.fib6_local_tbl) | |
e0b85590 | 2201 | goto out_fib6_main_tbl; |
58f09b78 | 2202 | net->ipv6.fib6_local_tbl->tb6_id = RT6_TABLE_LOCAL; |
66f5d6ce | 2203 | rcu_assign_pointer(net->ipv6.fib6_local_tbl->tb6_root.leaf, |
421842ed | 2204 | net->ipv6.fib6_null_entry); |
58f09b78 DL |
2205 | net->ipv6.fib6_local_tbl->tb6_root.fn_flags = |
2206 | RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO; | |
8e773277 | 2207 | inet_peer_base_init(&net->ipv6.fib6_local_tbl->tb6_peers); |
e0b85590 | 2208 | #endif |
58f09b78 | 2209 | fib6_tables_init(net); |
f845ab6b | 2210 | |
417f28bb | 2211 | return 0; |
d63bddbe | 2212 | |
e0b85590 | 2213 | #ifdef CONFIG_IPV6_MULTIPLE_TABLES |
e0b85590 | 2214 | out_fib6_main_tbl: |
58f09b78 | 2215 | kfree(net->ipv6.fib6_main_tbl); |
e0b85590 | 2216 | #endif |
e0b85590 | 2217 | out_fib_table_hash: |
58f09b78 | 2218 | kfree(net->ipv6.fib_table_hash); |
c572872f BT |
2219 | out_rt6_stats: |
2220 | kfree(net->ipv6.rt6_stats); | |
63152fc0 | 2221 | out_timer: |
16ab6d7d | 2222 | fib6_notifier_exit(net); |
417f28bb | 2223 | return -ENOMEM; |
8db46f1d | 2224 | } |
58f09b78 DL |
2225 | |
2226 | static void fib6_net_exit(struct net *net) | |
2227 | { | |
ba1cc08d SD |
2228 | unsigned int i; |
2229 | ||
417f28bb SH |
2230 | del_timer_sync(&net->ipv6.ip6_fib_timer); |
2231 | ||
32a805ba | 2232 | for (i = 0; i < FIB6_TABLE_HASHSZ; i++) { |
ba1cc08d SD |
2233 | struct hlist_head *head = &net->ipv6.fib_table_hash[i]; |
2234 | struct hlist_node *tmp; | |
2235 | struct fib6_table *tb; | |
2236 | ||
2237 | hlist_for_each_entry_safe(tb, tmp, head, tb6_hlist) { | |
2238 | hlist_del(&tb->tb6_hlist); | |
2239 | fib6_free_table(tb); | |
2240 | } | |
2241 | } | |
2242 | ||
58f09b78 | 2243 | kfree(net->ipv6.fib_table_hash); |
c572872f | 2244 | kfree(net->ipv6.rt6_stats); |
16ab6d7d | 2245 | fib6_notifier_exit(net); |
58f09b78 DL |
2246 | } |
2247 | ||
2248 | static struct pernet_operations fib6_net_ops = { | |
2249 | .init = fib6_net_init, | |
2250 | .exit = fib6_net_exit, | |
2251 | }; | |
2252 | ||
2253 | int __init fib6_init(void) | |
2254 | { | |
2255 | int ret = -ENOMEM; | |
63152fc0 | 2256 | |
58f09b78 DL |
2257 | fib6_node_kmem = kmem_cache_create("fib6_nodes", |
2258 | sizeof(struct fib6_node), | |
2259 | 0, SLAB_HWCACHE_ALIGN, | |
2260 | NULL); | |
2261 | if (!fib6_node_kmem) | |
2262 | goto out; | |
2263 | ||
2264 | ret = register_pernet_subsys(&fib6_net_ops); | |
2265 | if (ret) | |
c572872f | 2266 | goto out_kmem_cache_create; |
e8803b6c | 2267 | |
16feebcf FW |
2268 | ret = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETROUTE, NULL, |
2269 | inet6_dump_fib, 0); | |
e8803b6c DM |
2270 | if (ret) |
2271 | goto out_unregister_subsys; | |
705f1c86 HFS |
2272 | |
2273 | __fib6_flush_trees = fib6_flush_trees; | |
58f09b78 DL |
2274 | out: |
2275 | return ret; | |
2276 | ||
e8803b6c DM |
2277 | out_unregister_subsys: |
2278 | unregister_pernet_subsys(&fib6_net_ops); | |
d63bddbe DL |
2279 | out_kmem_cache_create: |
2280 | kmem_cache_destroy(fib6_node_kmem); | |
2281 | goto out; | |
1da177e4 LT |
2282 | } |
2283 | ||
2284 | void fib6_gc_cleanup(void) | |
2285 | { | |
58f09b78 | 2286 | unregister_pernet_subsys(&fib6_net_ops); |
1da177e4 LT |
2287 | kmem_cache_destroy(fib6_node_kmem); |
2288 | } | |
8d2ca1d7 HFS |
2289 | |
2290 | #ifdef CONFIG_PROC_FS | |
8d2ca1d7 HFS |
2291 | static int ipv6_route_seq_show(struct seq_file *seq, void *v) |
2292 | { | |
8d1c802b | 2293 | struct fib6_info *rt = v; |
8d2ca1d7 | 2294 | struct ipv6_route_iter *iter = seq->private; |
2b2450ca | 2295 | unsigned int flags = rt->fib6_flags; |
5e670d84 | 2296 | const struct net_device *dev; |
8d2ca1d7 | 2297 | |
93c2fb25 | 2298 | seq_printf(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen); |
8d2ca1d7 HFS |
2299 | |
2300 | #ifdef CONFIG_IPV6_SUBTREES | |
93c2fb25 | 2301 | seq_printf(seq, "%pi6 %02x ", &rt->fib6_src.addr, rt->fib6_src.plen); |
8d2ca1d7 HFS |
2302 | #else |
2303 | seq_puts(seq, "00000000000000000000000000000000 00 "); | |
2304 | #endif | |
bdf00467 | 2305 | if (rt->fib6_nh.fib_nh_gw_family) { |
2b2450ca | 2306 | flags |= RTF_GATEWAY; |
ad1601ae | 2307 | seq_printf(seq, "%pi6", &rt->fib6_nh.fib_nh_gw6); |
2b2450ca | 2308 | } else { |
8d2ca1d7 | 2309 | seq_puts(seq, "00000000000000000000000000000000"); |
2b2450ca | 2310 | } |
8d2ca1d7 | 2311 | |
ad1601ae | 2312 | dev = rt->fib6_nh.fib_nh_dev; |
8d2ca1d7 | 2313 | seq_printf(seq, " %08x %08x %08x %08x %8s\n", |
93c2fb25 | 2314 | rt->fib6_metric, atomic_read(&rt->fib6_ref), 0, |
2b2450ca | 2315 | flags, dev ? dev->name : ""); |
8d2ca1d7 HFS |
2316 | iter->w.leaf = NULL; |
2317 | return 0; | |
2318 | } | |
2319 | ||
94b2cfe0 | 2320 | static int ipv6_route_yield(struct fib6_walker *w) |
8d2ca1d7 HFS |
2321 | { |
2322 | struct ipv6_route_iter *iter = w->args; | |
2323 | ||
2324 | if (!iter->skip) | |
2325 | return 1; | |
2326 | ||
2327 | do { | |
66f5d6ce | 2328 | iter->w.leaf = rcu_dereference_protected( |
8fb11a9a | 2329 | iter->w.leaf->fib6_next, |
66f5d6ce | 2330 | lockdep_is_held(&iter->tbl->tb6_lock)); |
8d2ca1d7 HFS |
2331 | iter->skip--; |
2332 | if (!iter->skip && iter->w.leaf) | |
2333 | return 1; | |
2334 | } while (iter->w.leaf); | |
2335 | ||
2336 | return 0; | |
2337 | } | |
2338 | ||
9a03cd8f MK |
2339 | static void ipv6_route_seq_setup_walk(struct ipv6_route_iter *iter, |
2340 | struct net *net) | |
8d2ca1d7 HFS |
2341 | { |
2342 | memset(&iter->w, 0, sizeof(iter->w)); | |
2343 | iter->w.func = ipv6_route_yield; | |
2344 | iter->w.root = &iter->tbl->tb6_root; | |
2345 | iter->w.state = FWS_INIT; | |
2346 | iter->w.node = iter->w.root; | |
2347 | iter->w.args = iter; | |
0a67d3ef | 2348 | iter->sernum = iter->w.root->fn_sernum; |
8d2ca1d7 | 2349 | INIT_LIST_HEAD(&iter->w.lh); |
9a03cd8f | 2350 | fib6_walker_link(net, &iter->w); |
8d2ca1d7 HFS |
2351 | } |
2352 | ||
2353 | static struct fib6_table *ipv6_route_seq_next_table(struct fib6_table *tbl, | |
2354 | struct net *net) | |
2355 | { | |
2356 | unsigned int h; | |
2357 | struct hlist_node *node; | |
2358 | ||
2359 | if (tbl) { | |
2360 | h = (tbl->tb6_id & (FIB6_TABLE_HASHSZ - 1)) + 1; | |
2361 | node = rcu_dereference_bh(hlist_next_rcu(&tbl->tb6_hlist)); | |
2362 | } else { | |
2363 | h = 0; | |
2364 | node = NULL; | |
2365 | } | |
2366 | ||
2367 | while (!node && h < FIB6_TABLE_HASHSZ) { | |
2368 | node = rcu_dereference_bh( | |
2369 | hlist_first_rcu(&net->ipv6.fib_table_hash[h++])); | |
2370 | } | |
2371 | return hlist_entry_safe(node, struct fib6_table, tb6_hlist); | |
2372 | } | |
2373 | ||
0a67d3ef HFS |
2374 | static void ipv6_route_check_sernum(struct ipv6_route_iter *iter) |
2375 | { | |
2376 | if (iter->sernum != iter->w.root->fn_sernum) { | |
2377 | iter->sernum = iter->w.root->fn_sernum; | |
2378 | iter->w.state = FWS_INIT; | |
2379 | iter->w.node = iter->w.root; | |
2380 | WARN_ON(iter->w.skip); | |
2381 | iter->w.skip = iter->w.count; | |
2382 | } | |
2383 | } | |
2384 | ||
8d2ca1d7 HFS |
2385 | static void *ipv6_route_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
2386 | { | |
2387 | int r; | |
8d1c802b | 2388 | struct fib6_info *n; |
8d2ca1d7 HFS |
2389 | struct net *net = seq_file_net(seq); |
2390 | struct ipv6_route_iter *iter = seq->private; | |
2391 | ||
2392 | if (!v) | |
2393 | goto iter_table; | |
2394 | ||
8fb11a9a | 2395 | n = rcu_dereference_bh(((struct fib6_info *)v)->fib6_next); |
8d2ca1d7 HFS |
2396 | if (n) { |
2397 | ++*pos; | |
2398 | return n; | |
2399 | } | |
2400 | ||
2401 | iter_table: | |
0a67d3ef | 2402 | ipv6_route_check_sernum(iter); |
66f5d6ce | 2403 | spin_lock_bh(&iter->tbl->tb6_lock); |
8d2ca1d7 | 2404 | r = fib6_walk_continue(&iter->w); |
66f5d6ce | 2405 | spin_unlock_bh(&iter->tbl->tb6_lock); |
8d2ca1d7 HFS |
2406 | if (r > 0) { |
2407 | if (v) | |
2408 | ++*pos; | |
2409 | return iter->w.leaf; | |
2410 | } else if (r < 0) { | |
9a03cd8f | 2411 | fib6_walker_unlink(net, &iter->w); |
8d2ca1d7 HFS |
2412 | return NULL; |
2413 | } | |
9a03cd8f | 2414 | fib6_walker_unlink(net, &iter->w); |
8d2ca1d7 HFS |
2415 | |
2416 | iter->tbl = ipv6_route_seq_next_table(iter->tbl, net); | |
2417 | if (!iter->tbl) | |
2418 | return NULL; | |
2419 | ||
9a03cd8f | 2420 | ipv6_route_seq_setup_walk(iter, net); |
8d2ca1d7 HFS |
2421 | goto iter_table; |
2422 | } | |
2423 | ||
2424 | static void *ipv6_route_seq_start(struct seq_file *seq, loff_t *pos) | |
2425 | __acquires(RCU_BH) | |
2426 | { | |
2427 | struct net *net = seq_file_net(seq); | |
2428 | struct ipv6_route_iter *iter = seq->private; | |
2429 | ||
2430 | rcu_read_lock_bh(); | |
2431 | iter->tbl = ipv6_route_seq_next_table(NULL, net); | |
2432 | iter->skip = *pos; | |
2433 | ||
2434 | if (iter->tbl) { | |
9a03cd8f | 2435 | ipv6_route_seq_setup_walk(iter, net); |
8d2ca1d7 HFS |
2436 | return ipv6_route_seq_next(seq, NULL, pos); |
2437 | } else { | |
2438 | return NULL; | |
2439 | } | |
2440 | } | |
2441 | ||
2442 | static bool ipv6_route_iter_active(struct ipv6_route_iter *iter) | |
2443 | { | |
94b2cfe0 | 2444 | struct fib6_walker *w = &iter->w; |
8d2ca1d7 HFS |
2445 | return w->node && !(w->state == FWS_U && w->node == w->root); |
2446 | } | |
2447 | ||
2448 | static void ipv6_route_seq_stop(struct seq_file *seq, void *v) | |
2449 | __releases(RCU_BH) | |
2450 | { | |
9a03cd8f | 2451 | struct net *net = seq_file_net(seq); |
8d2ca1d7 HFS |
2452 | struct ipv6_route_iter *iter = seq->private; |
2453 | ||
2454 | if (ipv6_route_iter_active(iter)) | |
9a03cd8f | 2455 | fib6_walker_unlink(net, &iter->w); |
8d2ca1d7 HFS |
2456 | |
2457 | rcu_read_unlock_bh(); | |
2458 | } | |
2459 | ||
c3506372 | 2460 | const struct seq_operations ipv6_route_seq_ops = { |
8d2ca1d7 HFS |
2461 | .start = ipv6_route_seq_start, |
2462 | .next = ipv6_route_seq_next, | |
2463 | .stop = ipv6_route_seq_stop, | |
2464 | .show = ipv6_route_seq_show | |
2465 | }; | |
8d2ca1d7 | 2466 | #endif /* CONFIG_PROC_FS */ |