Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Generic address resolution entity | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Fixes: | |
14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
15 | * Harald Welte Add neighbour cache statistics like rtstat | |
16 | */ | |
17 | ||
e005d193 JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/socket.h> | |
1da177e4 LT |
25 | #include <linux/netdevice.h> |
26 | #include <linux/proc_fs.h> | |
27 | #ifdef CONFIG_SYSCTL | |
28 | #include <linux/sysctl.h> | |
29 | #endif | |
30 | #include <linux/times.h> | |
457c4cbc | 31 | #include <net/net_namespace.h> |
1da177e4 LT |
32 | #include <net/neighbour.h> |
33 | #include <net/dst.h> | |
34 | #include <net/sock.h> | |
8d71740c | 35 | #include <net/netevent.h> |
a14a49d2 | 36 | #include <net/netlink.h> |
1da177e4 LT |
37 | #include <linux/rtnetlink.h> |
38 | #include <linux/random.h> | |
543537bd | 39 | #include <linux/string.h> |
c3609d51 | 40 | #include <linux/log2.h> |
1d4c8c29 | 41 | #include <linux/inetdevice.h> |
bba24896 | 42 | #include <net/addrconf.h> |
1da177e4 | 43 | |
d5d427cd | 44 | #define DEBUG |
1da177e4 | 45 | #define NEIGH_DEBUG 1 |
d5d427cd JP |
46 | #define neigh_dbg(level, fmt, ...) \ |
47 | do { \ | |
48 | if (level <= NEIGH_DEBUG) \ | |
49 | pr_debug(fmt, ##__VA_ARGS__); \ | |
50 | } while (0) | |
1da177e4 LT |
51 | |
52 | #define PNEIGH_HASHMASK 0xF | |
53 | ||
54 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
55 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
56 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 57 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 | 58 | |
45fc3b11 | 59 | #ifdef CONFIG_PROC_FS |
9a32144e | 60 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 61 | #endif |
1da177e4 LT |
62 | |
63 | /* | |
64 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
65 | ||
66 | - All the scans/updates to hash buckets MUST be made under this lock. | |
67 | - NOTHING clever should be made under this lock: no callbacks | |
68 | to protocol backends, no attempts to send something to network. | |
69 | It will result in deadlocks, if backend/driver wants to use neighbour | |
70 | cache. | |
71 | - If the entry requires some non-trivial actions, increase | |
72 | its reference count and release table lock. | |
73 | ||
74 | Neighbour entries are protected: | |
75 | - with reference count. | |
76 | - with rwlock neigh->lock | |
77 | ||
78 | Reference count prevents destruction. | |
79 | ||
80 | neigh->lock mainly serializes ll address data and its validity state. | |
81 | However, the same lock is used to protect another entry fields: | |
82 | - timer | |
83 | - resolution queue | |
84 | ||
85 | Again, nothing clever shall be made under neigh->lock, | |
86 | the most complicated procedure, which we allow is dev->hard_header. | |
87 | It is supposed, that dev->hard_header is simplistic and does | |
88 | not make callbacks to neighbour tables. | |
1da177e4 LT |
89 | */ |
90 | ||
8f40b161 | 91 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
92 | { |
93 | kfree_skb(skb); | |
94 | return -ENETDOWN; | |
95 | } | |
96 | ||
4f494554 TG |
97 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
98 | { | |
99 | if (neigh->parms->neigh_cleanup) | |
100 | neigh->parms->neigh_cleanup(neigh); | |
101 | ||
d961db35 | 102 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
103 | neigh_release(neigh); |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
108 | * It corresponds to default IPv6 settings and is not overridable, | |
109 | * because it is really reasonable choice. | |
110 | */ | |
111 | ||
112 | unsigned long neigh_rand_reach_time(unsigned long base) | |
113 | { | |
63862b5b | 114 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 115 | } |
0a204500 | 116 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 LT |
117 | |
118 | ||
119 | static int neigh_forced_gc(struct neigh_table *tbl) | |
120 | { | |
121 | int shrunk = 0; | |
122 | int i; | |
d6bf7817 | 123 | struct neigh_hash_table *nht; |
1da177e4 LT |
124 | |
125 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
126 | ||
127 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
128 | nht = rcu_dereference_protected(tbl->nht, |
129 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 130 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
131 | struct neighbour *n; |
132 | struct neighbour __rcu **np; | |
1da177e4 | 133 | |
d6bf7817 | 134 | np = &nht->hash_buckets[i]; |
767e97e1 ED |
135 | while ((n = rcu_dereference_protected(*np, |
136 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
137 | /* Neighbour record may be discarded if: |
138 | * - nobody refers to it. | |
139 | * - it is not permanent | |
140 | */ | |
141 | write_lock(&n->lock); | |
142 | if (atomic_read(&n->refcnt) == 1 && | |
143 | !(n->nud_state & NUD_PERMANENT)) { | |
767e97e1 ED |
144 | rcu_assign_pointer(*np, |
145 | rcu_dereference_protected(n->next, | |
146 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
147 | n->dead = 1; |
148 | shrunk = 1; | |
149 | write_unlock(&n->lock); | |
4f494554 | 150 | neigh_cleanup_and_release(n); |
1da177e4 LT |
151 | continue; |
152 | } | |
153 | write_unlock(&n->lock); | |
154 | np = &n->next; | |
155 | } | |
156 | } | |
157 | ||
158 | tbl->last_flush = jiffies; | |
159 | ||
160 | write_unlock_bh(&tbl->lock); | |
161 | ||
162 | return shrunk; | |
163 | } | |
164 | ||
a43d8994 PE |
165 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
166 | { | |
167 | neigh_hold(n); | |
168 | if (unlikely(mod_timer(&n->timer, when))) { | |
169 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
170 | n->nud_state); | |
171 | dump_stack(); | |
172 | } | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int neigh_del_timer(struct neighbour *n) |
176 | { | |
177 | if ((n->nud_state & NUD_IN_TIMER) && | |
178 | del_timer(&n->timer)) { | |
179 | neigh_release(n); | |
180 | return 1; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
186 | { | |
187 | struct sk_buff *skb; | |
188 | ||
189 | while ((skb = skb_dequeue(list)) != NULL) { | |
190 | dev_put(skb->dev); | |
191 | kfree_skb(skb); | |
192 | } | |
193 | } | |
194 | ||
49636bb1 | 195 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
196 | { |
197 | int i; | |
d6bf7817 | 198 | struct neigh_hash_table *nht; |
1da177e4 | 199 | |
d6bf7817 ED |
200 | nht = rcu_dereference_protected(tbl->nht, |
201 | lockdep_is_held(&tbl->lock)); | |
202 | ||
cd089336 | 203 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
204 | struct neighbour *n; |
205 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 206 | |
767e97e1 ED |
207 | while ((n = rcu_dereference_protected(*np, |
208 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
209 | if (dev && n->dev != dev) { |
210 | np = &n->next; | |
211 | continue; | |
212 | } | |
767e97e1 ED |
213 | rcu_assign_pointer(*np, |
214 | rcu_dereference_protected(n->next, | |
215 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
216 | write_lock(&n->lock); |
217 | neigh_del_timer(n); | |
218 | n->dead = 1; | |
219 | ||
220 | if (atomic_read(&n->refcnt) != 1) { | |
221 | /* The most unpleasant situation. | |
222 | We must destroy neighbour entry, | |
223 | but someone still uses it. | |
224 | ||
225 | The destroy will be delayed until | |
226 | the last user releases us, but | |
227 | we must kill timers etc. and move | |
228 | it to safe state. | |
229 | */ | |
c9ab4d85 | 230 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 231 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
232 | n->output = neigh_blackhole; |
233 | if (n->nud_state & NUD_VALID) | |
234 | n->nud_state = NUD_NOARP; | |
235 | else | |
236 | n->nud_state = NUD_NONE; | |
d5d427cd | 237 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
238 | } |
239 | write_unlock(&n->lock); | |
4f494554 | 240 | neigh_cleanup_and_release(n); |
1da177e4 LT |
241 | } |
242 | } | |
49636bb1 | 243 | } |
1da177e4 | 244 | |
49636bb1 HX |
245 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
246 | { | |
247 | write_lock_bh(&tbl->lock); | |
248 | neigh_flush_dev(tbl, dev); | |
249 | write_unlock_bh(&tbl->lock); | |
250 | } | |
0a204500 | 251 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
252 | |
253 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
254 | { | |
255 | write_lock_bh(&tbl->lock); | |
256 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
257 | pneigh_ifdown(tbl, dev); |
258 | write_unlock_bh(&tbl->lock); | |
259 | ||
260 | del_timer_sync(&tbl->proxy_timer); | |
261 | pneigh_queue_purge(&tbl->proxy_queue); | |
262 | return 0; | |
263 | } | |
0a204500 | 264 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 265 | |
596b9b68 | 266 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
267 | { |
268 | struct neighbour *n = NULL; | |
269 | unsigned long now = jiffies; | |
270 | int entries; | |
271 | ||
272 | entries = atomic_inc_return(&tbl->entries) - 1; | |
273 | if (entries >= tbl->gc_thresh3 || | |
274 | (entries >= tbl->gc_thresh2 && | |
275 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
276 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
277 | entries >= tbl->gc_thresh3) { |
278 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
279 | tbl->id); | |
280 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 281 | goto out_entries; |
fb811395 | 282 | } |
1da177e4 LT |
283 | } |
284 | ||
08433eff | 285 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
286 | if (!n) |
287 | goto out_entries; | |
288 | ||
c9ab4d85 | 289 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 290 | rwlock_init(&n->lock); |
0ed8ddf4 | 291 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
292 | n->updated = n->used = now; |
293 | n->nud_state = NUD_NONE; | |
294 | n->output = neigh_blackhole; | |
f6b72b62 | 295 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 296 | n->parms = neigh_parms_clone(&tbl->parms); |
b24b8a24 | 297 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
298 | |
299 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
300 | n->tbl = tbl; | |
301 | atomic_set(&n->refcnt, 1); | |
302 | n->dead = 1; | |
303 | out: | |
304 | return n; | |
305 | ||
306 | out_entries: | |
307 | atomic_dec(&tbl->entries); | |
308 | goto out; | |
309 | } | |
310 | ||
2c2aba6c DM |
311 | static void neigh_get_hash_rnd(u32 *x) |
312 | { | |
313 | get_random_bytes(x, sizeof(*x)); | |
314 | *x |= 1; | |
315 | } | |
316 | ||
cd089336 | 317 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 318 | { |
cd089336 | 319 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 320 | struct neigh_hash_table *ret; |
6193d2be | 321 | struct neighbour __rcu **buckets; |
2c2aba6c | 322 | int i; |
1da177e4 | 323 | |
d6bf7817 ED |
324 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
325 | if (!ret) | |
326 | return NULL; | |
327 | if (size <= PAGE_SIZE) | |
328 | buckets = kzalloc(size, GFP_ATOMIC); | |
329 | else | |
6193d2be | 330 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
331 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
332 | get_order(size)); | |
333 | if (!buckets) { | |
334 | kfree(ret); | |
335 | return NULL; | |
1da177e4 | 336 | } |
6193d2be | 337 | ret->hash_buckets = buckets; |
cd089336 | 338 | ret->hash_shift = shift; |
2c2aba6c DM |
339 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
340 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
341 | return ret; |
342 | } | |
343 | ||
d6bf7817 | 344 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 345 | { |
d6bf7817 ED |
346 | struct neigh_hash_table *nht = container_of(head, |
347 | struct neigh_hash_table, | |
348 | rcu); | |
cd089336 | 349 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 350 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 LT |
351 | |
352 | if (size <= PAGE_SIZE) | |
d6bf7817 | 353 | kfree(buckets); |
1da177e4 | 354 | else |
d6bf7817 ED |
355 | free_pages((unsigned long)buckets, get_order(size)); |
356 | kfree(nht); | |
1da177e4 LT |
357 | } |
358 | ||
d6bf7817 | 359 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 360 | unsigned long new_shift) |
1da177e4 | 361 | { |
d6bf7817 ED |
362 | unsigned int i, hash; |
363 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
364 | |
365 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
366 | ||
d6bf7817 ED |
367 | old_nht = rcu_dereference_protected(tbl->nht, |
368 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 369 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
370 | if (!new_nht) |
371 | return old_nht; | |
1da177e4 | 372 | |
cd089336 | 373 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
374 | struct neighbour *n, *next; |
375 | ||
767e97e1 ED |
376 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
377 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
378 | n != NULL; |
379 | n = next) { | |
380 | hash = tbl->hash(n->primary_key, n->dev, | |
381 | new_nht->hash_rnd); | |
1da177e4 | 382 | |
cd089336 | 383 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
384 | next = rcu_dereference_protected(n->next, |
385 | lockdep_is_held(&tbl->lock)); | |
386 | ||
387 | rcu_assign_pointer(n->next, | |
388 | rcu_dereference_protected( | |
389 | new_nht->hash_buckets[hash], | |
390 | lockdep_is_held(&tbl->lock))); | |
391 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
392 | } |
393 | } | |
1da177e4 | 394 | |
d6bf7817 ED |
395 | rcu_assign_pointer(tbl->nht, new_nht); |
396 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
397 | return new_nht; | |
1da177e4 LT |
398 | } |
399 | ||
400 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
401 | struct net_device *dev) | |
402 | { | |
403 | struct neighbour *n; | |
4ec93edb | 404 | |
1da177e4 LT |
405 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
406 | ||
d6bf7817 | 407 | rcu_read_lock_bh(); |
60395a20 EB |
408 | n = __neigh_lookup_noref(tbl, pkey, dev); |
409 | if (n) { | |
410 | if (!atomic_inc_not_zero(&n->refcnt)) | |
411 | n = NULL; | |
412 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 413 | } |
767e97e1 | 414 | |
d6bf7817 | 415 | rcu_read_unlock_bh(); |
1da177e4 LT |
416 | return n; |
417 | } | |
0a204500 | 418 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 419 | |
426b5303 EB |
420 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
421 | const void *pkey) | |
1da177e4 LT |
422 | { |
423 | struct neighbour *n; | |
424 | int key_len = tbl->key_len; | |
bc4bf5f3 | 425 | u32 hash_val; |
d6bf7817 | 426 | struct neigh_hash_table *nht; |
1da177e4 LT |
427 | |
428 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
429 | ||
d6bf7817 ED |
430 | rcu_read_lock_bh(); |
431 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 432 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
433 | |
434 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
435 | n != NULL; | |
436 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 437 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 438 | net_eq(dev_net(n->dev), net)) { |
767e97e1 ED |
439 | if (!atomic_inc_not_zero(&n->refcnt)) |
440 | n = NULL; | |
1da177e4 LT |
441 | NEIGH_CACHE_STAT_INC(tbl, hits); |
442 | break; | |
443 | } | |
444 | } | |
767e97e1 | 445 | |
d6bf7817 | 446 | rcu_read_unlock_bh(); |
1da177e4 LT |
447 | return n; |
448 | } | |
0a204500 | 449 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 450 | |
a263b309 DM |
451 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
452 | struct net_device *dev, bool want_ref) | |
1da177e4 LT |
453 | { |
454 | u32 hash_val; | |
455 | int key_len = tbl->key_len; | |
456 | int error; | |
596b9b68 | 457 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
d6bf7817 | 458 | struct neigh_hash_table *nht; |
1da177e4 LT |
459 | |
460 | if (!n) { | |
461 | rc = ERR_PTR(-ENOBUFS); | |
462 | goto out; | |
463 | } | |
464 | ||
465 | memcpy(n->primary_key, pkey, key_len); | |
466 | n->dev = dev; | |
467 | dev_hold(dev); | |
468 | ||
469 | /* Protocol specific setup. */ | |
470 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
471 | rc = ERR_PTR(error); | |
472 | goto out_neigh_release; | |
473 | } | |
474 | ||
da6a8fa0 | 475 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 476 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
477 | if (error < 0) { |
478 | rc = ERR_PTR(error); | |
479 | goto out_neigh_release; | |
480 | } | |
481 | } | |
482 | ||
447f2191 DM |
483 | /* Device specific setup. */ |
484 | if (n->parms->neigh_setup && | |
485 | (error = n->parms->neigh_setup(n)) < 0) { | |
486 | rc = ERR_PTR(error); | |
487 | goto out_neigh_release; | |
488 | } | |
489 | ||
1f9248e5 | 490 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
491 | |
492 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
493 | nht = rcu_dereference_protected(tbl->nht, |
494 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 495 | |
cd089336 DM |
496 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
497 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 498 | |
cd089336 | 499 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
500 | |
501 | if (n->parms->dead) { | |
502 | rc = ERR_PTR(-EINVAL); | |
503 | goto out_tbl_unlock; | |
504 | } | |
505 | ||
767e97e1 ED |
506 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
507 | lockdep_is_held(&tbl->lock)); | |
508 | n1 != NULL; | |
509 | n1 = rcu_dereference_protected(n1->next, | |
510 | lockdep_is_held(&tbl->lock))) { | |
1da177e4 | 511 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
a263b309 DM |
512 | if (want_ref) |
513 | neigh_hold(n1); | |
1da177e4 LT |
514 | rc = n1; |
515 | goto out_tbl_unlock; | |
516 | } | |
517 | } | |
518 | ||
1da177e4 | 519 | n->dead = 0; |
a263b309 DM |
520 | if (want_ref) |
521 | neigh_hold(n); | |
767e97e1 ED |
522 | rcu_assign_pointer(n->next, |
523 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
524 | lockdep_is_held(&tbl->lock))); | |
525 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 526 | write_unlock_bh(&tbl->lock); |
d5d427cd | 527 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
528 | rc = n; |
529 | out: | |
530 | return rc; | |
531 | out_tbl_unlock: | |
532 | write_unlock_bh(&tbl->lock); | |
533 | out_neigh_release: | |
534 | neigh_release(n); | |
535 | goto out; | |
536 | } | |
a263b309 | 537 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 538 | |
be01d655 | 539 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 540 | { |
fa86d322 | 541 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
542 | hash_val ^= (hash_val >> 16); |
543 | hash_val ^= hash_val >> 8; | |
544 | hash_val ^= hash_val >> 4; | |
545 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
546 | return hash_val; |
547 | } | |
fa86d322 | 548 | |
be01d655 YH |
549 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
550 | struct net *net, | |
551 | const void *pkey, | |
552 | int key_len, | |
553 | struct net_device *dev) | |
554 | { | |
555 | while (n) { | |
fa86d322 | 556 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 557 | net_eq(pneigh_net(n), net) && |
fa86d322 | 558 | (n->dev == dev || !n->dev)) |
be01d655 YH |
559 | return n; |
560 | n = n->next; | |
fa86d322 | 561 | } |
be01d655 YH |
562 | return NULL; |
563 | } | |
fa86d322 | 564 | |
be01d655 YH |
565 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
566 | struct net *net, const void *pkey, struct net_device *dev) | |
567 | { | |
568 | int key_len = tbl->key_len; | |
569 | u32 hash_val = pneigh_hash(pkey, key_len); | |
570 | ||
571 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
572 | net, pkey, key_len, dev); | |
fa86d322 | 573 | } |
0a204500 | 574 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 575 | |
426b5303 EB |
576 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
577 | struct net *net, const void *pkey, | |
1da177e4 LT |
578 | struct net_device *dev, int creat) |
579 | { | |
580 | struct pneigh_entry *n; | |
581 | int key_len = tbl->key_len; | |
be01d655 | 582 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
583 | |
584 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
585 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
586 | net, pkey, key_len, dev); | |
1da177e4 | 587 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
588 | |
589 | if (n || !creat) | |
1da177e4 LT |
590 | goto out; |
591 | ||
4ae28944 PE |
592 | ASSERT_RTNL(); |
593 | ||
1da177e4 LT |
594 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
595 | if (!n) | |
596 | goto out; | |
597 | ||
efd7ef1c | 598 | write_pnet(&n->net, net); |
1da177e4 LT |
599 | memcpy(n->key, pkey, key_len); |
600 | n->dev = dev; | |
601 | if (dev) | |
602 | dev_hold(dev); | |
603 | ||
604 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
605 | if (dev) | |
606 | dev_put(dev); | |
607 | kfree(n); | |
608 | n = NULL; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | write_lock_bh(&tbl->lock); | |
613 | n->next = tbl->phash_buckets[hash_val]; | |
614 | tbl->phash_buckets[hash_val] = n; | |
615 | write_unlock_bh(&tbl->lock); | |
616 | out: | |
617 | return n; | |
618 | } | |
0a204500 | 619 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
620 | |
621 | ||
426b5303 | 622 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
623 | struct net_device *dev) |
624 | { | |
625 | struct pneigh_entry *n, **np; | |
626 | int key_len = tbl->key_len; | |
be01d655 | 627 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
628 | |
629 | write_lock_bh(&tbl->lock); | |
630 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
631 | np = &n->next) { | |
426b5303 | 632 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 633 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
634 | *np = n->next; |
635 | write_unlock_bh(&tbl->lock); | |
636 | if (tbl->pdestructor) | |
637 | tbl->pdestructor(n); | |
638 | if (n->dev) | |
639 | dev_put(n->dev); | |
640 | kfree(n); | |
641 | return 0; | |
642 | } | |
643 | } | |
644 | write_unlock_bh(&tbl->lock); | |
645 | return -ENOENT; | |
646 | } | |
647 | ||
648 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
649 | { | |
650 | struct pneigh_entry *n, **np; | |
651 | u32 h; | |
652 | ||
653 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
654 | np = &tbl->phash_buckets[h]; | |
655 | while ((n = *np) != NULL) { | |
656 | if (!dev || n->dev == dev) { | |
657 | *np = n->next; | |
658 | if (tbl->pdestructor) | |
659 | tbl->pdestructor(n); | |
660 | if (n->dev) | |
661 | dev_put(n->dev); | |
662 | kfree(n); | |
663 | continue; | |
664 | } | |
665 | np = &n->next; | |
666 | } | |
667 | } | |
668 | return -ENOENT; | |
669 | } | |
670 | ||
06f0511d DL |
671 | static void neigh_parms_destroy(struct neigh_parms *parms); |
672 | ||
673 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
674 | { | |
675 | if (atomic_dec_and_test(&parms->refcnt)) | |
676 | neigh_parms_destroy(parms); | |
677 | } | |
1da177e4 LT |
678 | |
679 | /* | |
680 | * neighbour must already be out of the table; | |
681 | * | |
682 | */ | |
683 | void neigh_destroy(struct neighbour *neigh) | |
684 | { | |
da6a8fa0 DM |
685 | struct net_device *dev = neigh->dev; |
686 | ||
1da177e4 LT |
687 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
688 | ||
689 | if (!neigh->dead) { | |
e005d193 | 690 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
691 | dump_stack(); |
692 | return; | |
693 | } | |
694 | ||
695 | if (neigh_del_timer(neigh)) | |
e005d193 | 696 | pr_warn("Impossible event\n"); |
1da177e4 | 697 | |
c9ab4d85 ED |
698 | write_lock_bh(&neigh->lock); |
699 | __skb_queue_purge(&neigh->arp_queue); | |
700 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 701 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 702 | |
447f2191 | 703 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 704 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 705 | |
da6a8fa0 | 706 | dev_put(dev); |
1da177e4 LT |
707 | neigh_parms_put(neigh->parms); |
708 | ||
d5d427cd | 709 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
710 | |
711 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 712 | kfree_rcu(neigh, rcu); |
1da177e4 | 713 | } |
0a204500 | 714 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
715 | |
716 | /* Neighbour state is suspicious; | |
717 | disable fast path. | |
718 | ||
719 | Called with write_locked neigh. | |
720 | */ | |
721 | static void neigh_suspect(struct neighbour *neigh) | |
722 | { | |
d5d427cd | 723 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
724 | |
725 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
726 | } |
727 | ||
728 | /* Neighbour state is OK; | |
729 | enable fast path. | |
730 | ||
731 | Called with write_locked neigh. | |
732 | */ | |
733 | static void neigh_connect(struct neighbour *neigh) | |
734 | { | |
d5d427cd | 735 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
736 | |
737 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
738 | } |
739 | ||
e4c4e448 | 740 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 741 | { |
e4c4e448 | 742 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
743 | struct neighbour *n; |
744 | struct neighbour __rcu **np; | |
e4c4e448 | 745 | unsigned int i; |
d6bf7817 | 746 | struct neigh_hash_table *nht; |
1da177e4 LT |
747 | |
748 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
749 | ||
e4c4e448 | 750 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
751 | nht = rcu_dereference_protected(tbl->nht, |
752 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
753 | |
754 | /* | |
755 | * periodically recompute ReachableTime from random function | |
756 | */ | |
757 | ||
e4c4e448 | 758 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 759 | struct neigh_parms *p; |
e4c4e448 | 760 | tbl->last_rand = jiffies; |
75fbfd33 | 761 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 762 | p->reachable_time = |
1f9248e5 | 763 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
764 | } |
765 | ||
feff9ab2 DJ |
766 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
767 | goto out; | |
768 | ||
cd089336 | 769 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 770 | np = &nht->hash_buckets[i]; |
1da177e4 | 771 | |
767e97e1 ED |
772 | while ((n = rcu_dereference_protected(*np, |
773 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 774 | unsigned int state; |
1da177e4 | 775 | |
e4c4e448 | 776 | write_lock(&n->lock); |
1da177e4 | 777 | |
e4c4e448 ED |
778 | state = n->nud_state; |
779 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
780 | write_unlock(&n->lock); | |
781 | goto next_elt; | |
782 | } | |
1da177e4 | 783 | |
e4c4e448 ED |
784 | if (time_before(n->used, n->confirmed)) |
785 | n->used = n->confirmed; | |
1da177e4 | 786 | |
e4c4e448 ED |
787 | if (atomic_read(&n->refcnt) == 1 && |
788 | (state == NUD_FAILED || | |
1f9248e5 | 789 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 ED |
790 | *np = n->next; |
791 | n->dead = 1; | |
792 | write_unlock(&n->lock); | |
793 | neigh_cleanup_and_release(n); | |
794 | continue; | |
795 | } | |
1da177e4 | 796 | write_unlock(&n->lock); |
1da177e4 LT |
797 | |
798 | next_elt: | |
e4c4e448 ED |
799 | np = &n->next; |
800 | } | |
801 | /* | |
802 | * It's fine to release lock here, even if hash table | |
803 | * grows while we are preempted. | |
804 | */ | |
805 | write_unlock_bh(&tbl->lock); | |
806 | cond_resched(); | |
807 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
808 | nht = rcu_dereference_protected(tbl->nht, |
809 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 810 | } |
2724680b | 811 | out: |
1f9248e5 JP |
812 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
813 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
814 | * BASE_REACHABLE_TIME. | |
1da177e4 | 815 | */ |
f618002b | 816 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 817 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 818 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
819 | } |
820 | ||
821 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
822 | { | |
823 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
824 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
825 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
826 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
827 | } |
828 | ||
5ef12d98 | 829 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
830 | __releases(neigh->lock) |
831 | __acquires(neigh->lock) | |
5ef12d98 TT |
832 | { |
833 | struct sk_buff *skb; | |
834 | ||
835 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 836 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
837 | neigh->updated = jiffies; |
838 | ||
839 | /* It is very thin place. report_unreachable is very complicated | |
840 | routine. Particularly, it can hit the same neighbour entry! | |
841 | ||
842 | So that, we try to be accurate and avoid dead loop. --ANK | |
843 | */ | |
844 | while (neigh->nud_state == NUD_FAILED && | |
845 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
846 | write_unlock(&neigh->lock); | |
847 | neigh->ops->error_report(neigh, skb); | |
848 | write_lock(&neigh->lock); | |
849 | } | |
c9ab4d85 | 850 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 851 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
852 | } |
853 | ||
cd28ca0a ED |
854 | static void neigh_probe(struct neighbour *neigh) |
855 | __releases(neigh->lock) | |
856 | { | |
4ed377e3 | 857 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
858 | /* keep skb alive even if arp_queue overflows */ |
859 | if (skb) | |
19125c1a | 860 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a ED |
861 | write_unlock(&neigh->lock); |
862 | neigh->ops->solicit(neigh, skb); | |
863 | atomic_inc(&neigh->probes); | |
864 | kfree_skb(skb); | |
865 | } | |
866 | ||
1da177e4 LT |
867 | /* Called when a timer expires for a neighbour entry. */ |
868 | ||
869 | static void neigh_timer_handler(unsigned long arg) | |
870 | { | |
871 | unsigned long now, next; | |
872 | struct neighbour *neigh = (struct neighbour *)arg; | |
95c96174 | 873 | unsigned int state; |
1da177e4 LT |
874 | int notify = 0; |
875 | ||
876 | write_lock(&neigh->lock); | |
877 | ||
878 | state = neigh->nud_state; | |
879 | now = jiffies; | |
880 | next = now + HZ; | |
881 | ||
045f7b3b | 882 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 883 | goto out; |
1da177e4 LT |
884 | |
885 | if (state & NUD_REACHABLE) { | |
4ec93edb | 886 | if (time_before_eq(now, |
1da177e4 | 887 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 888 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
889 | next = neigh->confirmed + neigh->parms->reachable_time; |
890 | } else if (time_before_eq(now, | |
1f9248e5 JP |
891 | neigh->used + |
892 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 893 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 894 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 895 | neigh->updated = jiffies; |
1da177e4 | 896 | neigh_suspect(neigh); |
1f9248e5 | 897 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 898 | } else { |
d5d427cd | 899 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 900 | neigh->nud_state = NUD_STALE; |
955aaa2f | 901 | neigh->updated = jiffies; |
1da177e4 | 902 | neigh_suspect(neigh); |
8d71740c | 903 | notify = 1; |
1da177e4 LT |
904 | } |
905 | } else if (state & NUD_DELAY) { | |
4ec93edb | 906 | if (time_before_eq(now, |
1f9248e5 JP |
907 | neigh->confirmed + |
908 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 909 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 910 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 911 | neigh->updated = jiffies; |
1da177e4 | 912 | neigh_connect(neigh); |
8d71740c | 913 | notify = 1; |
1da177e4 LT |
914 | next = neigh->confirmed + neigh->parms->reachable_time; |
915 | } else { | |
d5d427cd | 916 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 917 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 918 | neigh->updated = jiffies; |
1da177e4 | 919 | atomic_set(&neigh->probes, 0); |
765c9c63 | 920 | notify = 1; |
1f9248e5 | 921 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
922 | } |
923 | } else { | |
924 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
1f9248e5 | 925 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
926 | } |
927 | ||
928 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
929 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
930 | neigh->nud_state = NUD_FAILED; |
931 | notify = 1; | |
5ef12d98 | 932 | neigh_invalidate(neigh); |
5e2c21dc | 933 | goto out; |
1da177e4 LT |
934 | } |
935 | ||
936 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
937 | if (time_before(next, jiffies + HZ/2)) |
938 | next = jiffies + HZ/2; | |
6fb9974f HX |
939 | if (!mod_timer(&neigh->timer, next)) |
940 | neigh_hold(neigh); | |
1da177e4 LT |
941 | } |
942 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 943 | neigh_probe(neigh); |
9ff56607 | 944 | } else { |
69cc64d8 | 945 | out: |
9ff56607 DM |
946 | write_unlock(&neigh->lock); |
947 | } | |
d961db35 | 948 | |
8d71740c | 949 | if (notify) |
d961db35 | 950 | neigh_update_notify(neigh); |
1da177e4 | 951 | |
1da177e4 LT |
952 | neigh_release(neigh); |
953 | } | |
954 | ||
955 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
956 | { | |
957 | int rc; | |
cd28ca0a | 958 | bool immediate_probe = false; |
1da177e4 LT |
959 | |
960 | write_lock_bh(&neigh->lock); | |
961 | ||
962 | rc = 0; | |
963 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
964 | goto out_unlock_bh; | |
2c51a97f JA |
965 | if (neigh->dead) |
966 | goto out_dead; | |
1da177e4 | 967 | |
1da177e4 | 968 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
969 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
970 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
971 | unsigned long next, now = jiffies; |
972 | ||
1f9248e5 JP |
973 | atomic_set(&neigh->probes, |
974 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
1da177e4 | 975 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 976 | neigh->updated = now; |
1f9248e5 JP |
977 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
978 | HZ/2); | |
cd28ca0a ED |
979 | neigh_add_timer(neigh, next); |
980 | immediate_probe = true; | |
1da177e4 LT |
981 | } else { |
982 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 983 | neigh->updated = jiffies; |
1da177e4 LT |
984 | write_unlock_bh(&neigh->lock); |
985 | ||
f3fbbe0f | 986 | kfree_skb(skb); |
1da177e4 LT |
987 | return 1; |
988 | } | |
989 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 990 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 991 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 992 | neigh->updated = jiffies; |
1f9248e5 JP |
993 | neigh_add_timer(neigh, jiffies + |
994 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
995 | } |
996 | ||
997 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
998 | if (skb) { | |
8b5c171b | 999 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1000 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1001 | struct sk_buff *buff; |
8b5c171b | 1002 | |
f72051b0 | 1003 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1004 | if (!buff) |
1005 | break; | |
1006 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1007 | kfree_skb(buff); |
9a6d276e | 1008 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1009 | } |
a4731138 | 1010 | skb_dst_force(skb); |
1da177e4 | 1011 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1012 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1013 | } |
1014 | rc = 1; | |
1015 | } | |
1016 | out_unlock_bh: | |
cd28ca0a ED |
1017 | if (immediate_probe) |
1018 | neigh_probe(neigh); | |
1019 | else | |
1020 | write_unlock(&neigh->lock); | |
1021 | local_bh_enable(); | |
1da177e4 | 1022 | return rc; |
2c51a97f JA |
1023 | |
1024 | out_dead: | |
1025 | if (neigh->nud_state & NUD_STALE) | |
1026 | goto out_unlock_bh; | |
1027 | write_unlock_bh(&neigh->lock); | |
1028 | kfree_skb(skb); | |
1029 | return 1; | |
1da177e4 | 1030 | } |
0a204500 | 1031 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1032 | |
f6b72b62 | 1033 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1034 | { |
1035 | struct hh_cache *hh; | |
3b04ddde | 1036 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1037 | = NULL; |
1038 | ||
1039 | if (neigh->dev->header_ops) | |
1040 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1041 | |
1042 | if (update) { | |
f6b72b62 DM |
1043 | hh = &neigh->hh; |
1044 | if (hh->hh_len) { | |
3644f0ce | 1045 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1046 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1047 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1048 | } |
1049 | } | |
1050 | } | |
1051 | ||
1052 | ||
1053 | ||
1054 | /* Generic update routine. | |
1055 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1056 | -- new is new state. | |
1057 | -- flags | |
1058 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1059 | if it is different. | |
1060 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1061 | lladdr instead of overriding it |
1da177e4 | 1062 | if it is different. |
1da177e4 LT |
1063 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
1064 | ||
4ec93edb | 1065 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1066 | NTF_ROUTER flag. |
1067 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1068 | a router. | |
1069 | ||
1070 | Caller MUST hold reference count on the entry. | |
1071 | */ | |
1072 | ||
1073 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1074 | u32 flags) | |
1075 | { | |
1076 | u8 old; | |
1077 | int err; | |
1da177e4 | 1078 | int notify = 0; |
1da177e4 LT |
1079 | struct net_device *dev; |
1080 | int update_isrouter = 0; | |
1081 | ||
1082 | write_lock_bh(&neigh->lock); | |
1083 | ||
1084 | dev = neigh->dev; | |
1085 | old = neigh->nud_state; | |
1086 | err = -EPERM; | |
1087 | ||
4ec93edb | 1088 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1089 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1090 | goto out; | |
2c51a97f JA |
1091 | if (neigh->dead) |
1092 | goto out; | |
1da177e4 LT |
1093 | |
1094 | if (!(new & NUD_VALID)) { | |
1095 | neigh_del_timer(neigh); | |
1096 | if (old & NUD_CONNECTED) | |
1097 | neigh_suspect(neigh); | |
1098 | neigh->nud_state = new; | |
1099 | err = 0; | |
1da177e4 | 1100 | notify = old & NUD_VALID; |
5ef12d98 TT |
1101 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
1102 | (new & NUD_FAILED)) { | |
1103 | neigh_invalidate(neigh); | |
1104 | notify = 1; | |
1105 | } | |
1da177e4 LT |
1106 | goto out; |
1107 | } | |
1108 | ||
1109 | /* Compare new lladdr with cached one */ | |
1110 | if (!dev->addr_len) { | |
1111 | /* First case: device needs no address. */ | |
1112 | lladdr = neigh->ha; | |
1113 | } else if (lladdr) { | |
1114 | /* The second case: if something is already cached | |
1115 | and a new address is proposed: | |
1116 | - compare new & old | |
1117 | - if they are different, check override flag | |
1118 | */ | |
4ec93edb | 1119 | if ((old & NUD_VALID) && |
1da177e4 LT |
1120 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1121 | lladdr = neigh->ha; | |
1122 | } else { | |
1123 | /* No address is supplied; if we know something, | |
1124 | use it, otherwise discard the request. | |
1125 | */ | |
1126 | err = -EINVAL; | |
1127 | if (!(old & NUD_VALID)) | |
1128 | goto out; | |
1129 | lladdr = neigh->ha; | |
1130 | } | |
1131 | ||
1132 | if (new & NUD_CONNECTED) | |
1133 | neigh->confirmed = jiffies; | |
1134 | neigh->updated = jiffies; | |
1135 | ||
1136 | /* If entry was valid and address is not changed, | |
1137 | do not change entry state, if new one is STALE. | |
1138 | */ | |
1139 | err = 0; | |
1140 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1141 | if (old & NUD_VALID) { | |
1142 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1143 | update_isrouter = 0; | |
1144 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1145 | (old & NUD_CONNECTED)) { | |
1146 | lladdr = neigh->ha; | |
1147 | new = NUD_STALE; | |
1148 | } else | |
1149 | goto out; | |
1150 | } else { | |
d1c2b501 | 1151 | if (lladdr == neigh->ha && new == NUD_STALE) |
1da177e4 LT |
1152 | new = old; |
1153 | } | |
1154 | } | |
1155 | ||
1156 | if (new != old) { | |
1157 | neigh_del_timer(neigh); | |
765c9c63 EK |
1158 | if (new & NUD_PROBE) |
1159 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1160 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1161 | neigh_add_timer(neigh, (jiffies + |
1162 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1163 | neigh->parms->reachable_time : |
1164 | 0))); | |
1da177e4 | 1165 | neigh->nud_state = new; |
53385d2d | 1166 | notify = 1; |
1da177e4 LT |
1167 | } |
1168 | ||
1169 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1170 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1171 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1172 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1173 | neigh_update_hhs(neigh); |
1174 | if (!(new & NUD_CONNECTED)) | |
1175 | neigh->confirmed = jiffies - | |
1f9248e5 | 1176 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1177 | notify = 1; |
1da177e4 LT |
1178 | } |
1179 | if (new == old) | |
1180 | goto out; | |
1181 | if (new & NUD_CONNECTED) | |
1182 | neigh_connect(neigh); | |
1183 | else | |
1184 | neigh_suspect(neigh); | |
1185 | if (!(old & NUD_VALID)) { | |
1186 | struct sk_buff *skb; | |
1187 | ||
1188 | /* Again: avoid dead loop if something went wrong */ | |
1189 | ||
1190 | while (neigh->nud_state & NUD_VALID && | |
1191 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1192 | struct dst_entry *dst = skb_dst(skb); |
1193 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1194 | write_unlock_bh(&neigh->lock); |
e049f288 | 1195 | |
1196 | rcu_read_lock(); | |
13a43d94 DM |
1197 | |
1198 | /* Why not just use 'neigh' as-is? The problem is that | |
1199 | * things such as shaper, eql, and sch_teql can end up | |
1200 | * using alternative, different, neigh objects to output | |
1201 | * the packet in the output path. So what we need to do | |
1202 | * here is re-lookup the top-level neigh in the path so | |
1203 | * we can reinject the packet there. | |
1204 | */ | |
1205 | n2 = NULL; | |
1206 | if (dst) { | |
1207 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1208 | if (n2) | |
1209 | n1 = n2; | |
1210 | } | |
8f40b161 | 1211 | n1->output(n1, skb); |
13a43d94 DM |
1212 | if (n2) |
1213 | neigh_release(n2); | |
e049f288 | 1214 | rcu_read_unlock(); |
1215 | ||
1da177e4 LT |
1216 | write_lock_bh(&neigh->lock); |
1217 | } | |
c9ab4d85 | 1218 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1219 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1220 | } |
1221 | out: | |
1222 | if (update_isrouter) { | |
1223 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1224 | (neigh->flags | NTF_ROUTER) : | |
1225 | (neigh->flags & ~NTF_ROUTER); | |
1226 | } | |
1227 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1228 | |
1229 | if (notify) | |
d961db35 TG |
1230 | neigh_update_notify(neigh); |
1231 | ||
1da177e4 LT |
1232 | return err; |
1233 | } | |
0a204500 | 1234 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1235 | |
7e980569 JB |
1236 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1237 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1238 | */ | |
1239 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1240 | { | |
2c51a97f JA |
1241 | if (neigh->dead) |
1242 | return; | |
7e980569 JB |
1243 | neigh->updated = jiffies; |
1244 | if (!(neigh->nud_state & NUD_FAILED)) | |
1245 | return; | |
2176d5d4 DJ |
1246 | neigh->nud_state = NUD_INCOMPLETE; |
1247 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 JB |
1248 | neigh_add_timer(neigh, |
1249 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); | |
1250 | } | |
1251 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1252 | ||
1da177e4 LT |
1253 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1254 | u8 *lladdr, void *saddr, | |
1255 | struct net_device *dev) | |
1256 | { | |
1257 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1258 | lladdr || !dev->addr_len); | |
1259 | if (neigh) | |
4ec93edb | 1260 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1261 | NEIGH_UPDATE_F_OVERRIDE); |
1262 | return neigh; | |
1263 | } | |
0a204500 | 1264 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1265 | |
34d101dd | 1266 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1267 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1268 | { |
bdf53c58 EB |
1269 | struct net_device *dev = n->dev; |
1270 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1271 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1272 | |
1273 | write_lock_bh(&n->lock); | |
34d101dd | 1274 | |
f6b72b62 DM |
1275 | /* Only one thread can come in here and initialize the |
1276 | * hh_cache entry. | |
1277 | */ | |
b23b5455 DM |
1278 | if (!hh->hh_len) |
1279 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1280 | |
0ed8ddf4 | 1281 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1282 | } |
1283 | ||
1da177e4 LT |
1284 | /* Slow and careful. */ |
1285 | ||
8f40b161 | 1286 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1287 | { |
1da177e4 LT |
1288 | int rc = 0; |
1289 | ||
1da177e4 LT |
1290 | if (!neigh_event_send(neigh, skb)) { |
1291 | int err; | |
1292 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1293 | unsigned int seq; |
34d101dd | 1294 | |
f6b72b62 | 1295 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
bdf53c58 | 1296 | neigh_hh_init(neigh); |
34d101dd | 1297 | |
0ed8ddf4 | 1298 | do { |
e1f16503 | 1299 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1300 | seq = read_seqbegin(&neigh->ha_lock); |
1301 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1302 | neigh->ha, NULL, skb->len); | |
1303 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1304 | |
1da177e4 | 1305 | if (err >= 0) |
542d4d68 | 1306 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1307 | else |
1308 | goto out_kfree_skb; | |
1309 | } | |
1310 | out: | |
1311 | return rc; | |
1da177e4 LT |
1312 | out_kfree_skb: |
1313 | rc = -EINVAL; | |
1314 | kfree_skb(skb); | |
1315 | goto out; | |
1316 | } | |
0a204500 | 1317 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1318 | |
1319 | /* As fast as possible without hh cache */ | |
1320 | ||
8f40b161 | 1321 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1322 | { |
1da177e4 | 1323 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1324 | unsigned int seq; |
8f40b161 | 1325 | int err; |
1da177e4 | 1326 | |
0ed8ddf4 | 1327 | do { |
e1f16503 | 1328 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1329 | seq = read_seqbegin(&neigh->ha_lock); |
1330 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1331 | neigh->ha, NULL, skb->len); | |
1332 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1333 | ||
1da177e4 | 1334 | if (err >= 0) |
542d4d68 | 1335 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1336 | else { |
1337 | err = -EINVAL; | |
1338 | kfree_skb(skb); | |
1339 | } | |
1340 | return err; | |
1341 | } | |
0a204500 | 1342 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1343 | |
8f40b161 DM |
1344 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1345 | { | |
1346 | return dev_queue_xmit(skb); | |
1347 | } | |
1348 | EXPORT_SYMBOL(neigh_direct_output); | |
1349 | ||
1da177e4 LT |
1350 | static void neigh_proxy_process(unsigned long arg) |
1351 | { | |
1352 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1353 | long sched_next = 0; | |
1354 | unsigned long now = jiffies; | |
f72051b0 | 1355 | struct sk_buff *skb, *n; |
1da177e4 LT |
1356 | |
1357 | spin_lock(&tbl->proxy_queue.lock); | |
1358 | ||
f72051b0 DM |
1359 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1360 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1361 | |
1da177e4 | 1362 | if (tdif <= 0) { |
f72051b0 | 1363 | struct net_device *dev = skb->dev; |
20e6074e | 1364 | |
f72051b0 | 1365 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1366 | if (tbl->proxy_redo && netif_running(dev)) { |
1367 | rcu_read_lock(); | |
f72051b0 | 1368 | tbl->proxy_redo(skb); |
20e6074e ED |
1369 | rcu_read_unlock(); |
1370 | } else { | |
f72051b0 | 1371 | kfree_skb(skb); |
20e6074e | 1372 | } |
1da177e4 LT |
1373 | |
1374 | dev_put(dev); | |
1375 | } else if (!sched_next || tdif < sched_next) | |
1376 | sched_next = tdif; | |
1377 | } | |
1378 | del_timer(&tbl->proxy_timer); | |
1379 | if (sched_next) | |
1380 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1381 | spin_unlock(&tbl->proxy_queue.lock); | |
1382 | } | |
1383 | ||
1384 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1385 | struct sk_buff *skb) | |
1386 | { | |
1387 | unsigned long now = jiffies; | |
63862b5b AH |
1388 | |
1389 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1390 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1391 | |
1f9248e5 | 1392 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1393 | kfree_skb(skb); |
1394 | return; | |
1395 | } | |
a61bbcf2 PM |
1396 | |
1397 | NEIGH_CB(skb)->sched_next = sched_next; | |
1398 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1399 | |
1400 | spin_lock(&tbl->proxy_queue.lock); | |
1401 | if (del_timer(&tbl->proxy_timer)) { | |
1402 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1403 | sched_next = tbl->proxy_timer.expires; | |
1404 | } | |
adf30907 | 1405 | skb_dst_drop(skb); |
1da177e4 LT |
1406 | dev_hold(skb->dev); |
1407 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1408 | mod_timer(&tbl->proxy_timer, sched_next); | |
1409 | spin_unlock(&tbl->proxy_queue.lock); | |
1410 | } | |
0a204500 | 1411 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1412 | |
97fd5bc7 | 1413 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1414 | struct net *net, int ifindex) |
1415 | { | |
1416 | struct neigh_parms *p; | |
1417 | ||
75fbfd33 | 1418 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1419 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1420 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1421 | return p; |
1422 | } | |
1423 | ||
1424 | return NULL; | |
1425 | } | |
1da177e4 LT |
1426 | |
1427 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1428 | struct neigh_table *tbl) | |
1429 | { | |
cf89d6b2 | 1430 | struct neigh_parms *p; |
00829823 SH |
1431 | struct net *net = dev_net(dev); |
1432 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1433 | |
cf89d6b2 | 1434 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1435 | if (p) { |
1da177e4 LT |
1436 | p->tbl = tbl; |
1437 | atomic_set(&p->refcnt, 1); | |
1da177e4 | 1438 | p->reachable_time = |
1f9248e5 | 1439 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1440 | dev_hold(dev); |
1441 | p->dev = dev; | |
efd7ef1c | 1442 | write_pnet(&p->net, net); |
63134803 | 1443 | p->sysctl_table = NULL; |
c7fb64db | 1444 | |
00829823 | 1445 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1446 | dev_put(dev); |
486b51d3 DL |
1447 | kfree(p); |
1448 | return NULL; | |
1da177e4 | 1449 | } |
486b51d3 | 1450 | |
1da177e4 | 1451 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1452 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1453 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1454 | |
1455 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1456 | } |
1457 | return p; | |
1458 | } | |
0a204500 | 1459 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1460 | |
1461 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1462 | { | |
1463 | struct neigh_parms *parms = | |
1464 | container_of(head, struct neigh_parms, rcu_head); | |
1465 | ||
1466 | neigh_parms_put(parms); | |
1467 | } | |
1468 | ||
1469 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1470 | { | |
1da177e4 LT |
1471 | if (!parms || parms == &tbl->parms) |
1472 | return; | |
1473 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1474 | list_del(&parms->list); |
1475 | parms->dead = 1; | |
1da177e4 | 1476 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1477 | if (parms->dev) |
1478 | dev_put(parms->dev); | |
1479 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1480 | } |
0a204500 | 1481 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1482 | |
06f0511d | 1483 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1484 | { |
1485 | kfree(parms); | |
1486 | } | |
1487 | ||
c2ecba71 PE |
1488 | static struct lock_class_key neigh_table_proxy_queue_class; |
1489 | ||
d7480fd3 WC |
1490 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1491 | ||
1492 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1493 | { |
1494 | unsigned long now = jiffies; | |
1495 | unsigned long phsize; | |
1496 | ||
75fbfd33 ND |
1497 | INIT_LIST_HEAD(&tbl->parms_list); |
1498 | list_add(&tbl->parms.list, &tbl->parms_list); | |
e42ea986 | 1499 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1500 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1501 | tbl->parms.reachable_time = |
1f9248e5 | 1502 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1503 | |
1da177e4 LT |
1504 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1505 | if (!tbl->stats) | |
1506 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1507 | |
1da177e4 | 1508 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1509 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1510 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1511 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1512 | #endif |
1513 | ||
cd089336 | 1514 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1515 | |
1516 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1517 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1518 | |
d6bf7817 | 1519 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1520 | panic("cannot allocate neighbour cache hashes"); |
1521 | ||
08433eff YH |
1522 | if (!tbl->entry_size) |
1523 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1524 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1525 | else | |
1526 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1527 | ||
1da177e4 | 1528 | rwlock_init(&tbl->lock); |
203b42f7 | 1529 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1530 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1531 | tbl->parms.reachable_time); | |
b24b8a24 | 1532 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1533 | skb_queue_head_init_class(&tbl->proxy_queue, |
1534 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1535 | |
1536 | tbl->last_flush = now; | |
1537 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1538 | |
d7480fd3 | 1539 | neigh_tables[index] = tbl; |
1da177e4 | 1540 | } |
0a204500 | 1541 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1542 | |
d7480fd3 | 1543 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1544 | { |
d7480fd3 | 1545 | neigh_tables[index] = NULL; |
1da177e4 | 1546 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1547 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1548 | del_timer_sync(&tbl->proxy_timer); |
1549 | pneigh_queue_purge(&tbl->proxy_queue); | |
1550 | neigh_ifdown(tbl, NULL); | |
1551 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1552 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1553 | |
6193d2be ED |
1554 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1555 | neigh_hash_free_rcu); | |
d6bf7817 | 1556 | tbl->nht = NULL; |
1da177e4 LT |
1557 | |
1558 | kfree(tbl->phash_buckets); | |
1559 | tbl->phash_buckets = NULL; | |
1560 | ||
3f192b5c AD |
1561 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1562 | ||
3fcde74b KK |
1563 | free_percpu(tbl->stats); |
1564 | tbl->stats = NULL; | |
1565 | ||
1da177e4 LT |
1566 | return 0; |
1567 | } | |
0a204500 | 1568 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1569 | |
d7480fd3 WC |
1570 | static struct neigh_table *neigh_find_table(int family) |
1571 | { | |
1572 | struct neigh_table *tbl = NULL; | |
1573 | ||
1574 | switch (family) { | |
1575 | case AF_INET: | |
1576 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1577 | break; | |
1578 | case AF_INET6: | |
1579 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1580 | break; | |
1581 | case AF_DECnet: | |
1582 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1583 | break; | |
1584 | } | |
1585 | ||
1586 | return tbl; | |
1587 | } | |
1588 | ||
661d2967 | 1589 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1590 | { |
3b1e0a65 | 1591 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1592 | struct ndmsg *ndm; |
1593 | struct nlattr *dst_attr; | |
1da177e4 | 1594 | struct neigh_table *tbl; |
d7480fd3 | 1595 | struct neighbour *neigh; |
1da177e4 | 1596 | struct net_device *dev = NULL; |
a14a49d2 | 1597 | int err = -EINVAL; |
1da177e4 | 1598 | |
110b2499 | 1599 | ASSERT_RTNL(); |
a14a49d2 | 1600 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1601 | goto out; |
1602 | ||
a14a49d2 TG |
1603 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1604 | if (dst_attr == NULL) | |
1605 | goto out; | |
1606 | ||
1607 | ndm = nlmsg_data(nlh); | |
1608 | if (ndm->ndm_ifindex) { | |
110b2499 | 1609 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1610 | if (dev == NULL) { |
1611 | err = -ENODEV; | |
1612 | goto out; | |
1613 | } | |
1614 | } | |
1615 | ||
d7480fd3 WC |
1616 | tbl = neigh_find_table(ndm->ndm_family); |
1617 | if (tbl == NULL) | |
1618 | return -EAFNOSUPPORT; | |
1da177e4 | 1619 | |
d7480fd3 WC |
1620 | if (nla_len(dst_attr) < tbl->key_len) |
1621 | goto out; | |
1da177e4 | 1622 | |
d7480fd3 WC |
1623 | if (ndm->ndm_flags & NTF_PROXY) { |
1624 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1625 | goto out; | |
1626 | } | |
1da177e4 | 1627 | |
d7480fd3 WC |
1628 | if (dev == NULL) |
1629 | goto out; | |
a14a49d2 | 1630 | |
d7480fd3 WC |
1631 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1632 | if (neigh == NULL) { | |
1633 | err = -ENOENT; | |
110b2499 | 1634 | goto out; |
1da177e4 | 1635 | } |
d7480fd3 WC |
1636 | |
1637 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1638 | NEIGH_UPDATE_F_OVERRIDE | | |
1639 | NEIGH_UPDATE_F_ADMIN); | |
1640 | neigh_release(neigh); | |
a14a49d2 | 1641 | |
1da177e4 LT |
1642 | out: |
1643 | return err; | |
1644 | } | |
1645 | ||
661d2967 | 1646 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1647 | { |
d7480fd3 | 1648 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
3b1e0a65 | 1649 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1650 | struct ndmsg *ndm; |
1651 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1652 | struct neigh_table *tbl; |
1653 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1654 | struct neighbour *neigh; |
1655 | void *dst, *lladdr; | |
5208debd | 1656 | int err; |
1da177e4 | 1657 | |
110b2499 | 1658 | ASSERT_RTNL(); |
5208debd TG |
1659 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1660 | if (err < 0) | |
1da177e4 LT |
1661 | goto out; |
1662 | ||
5208debd TG |
1663 | err = -EINVAL; |
1664 | if (tb[NDA_DST] == NULL) | |
1665 | goto out; | |
1666 | ||
1667 | ndm = nlmsg_data(nlh); | |
1668 | if (ndm->ndm_ifindex) { | |
110b2499 | 1669 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1670 | if (dev == NULL) { |
1671 | err = -ENODEV; | |
1672 | goto out; | |
1673 | } | |
1674 | ||
1675 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
110b2499 | 1676 | goto out; |
5208debd TG |
1677 | } |
1678 | ||
d7480fd3 WC |
1679 | tbl = neigh_find_table(ndm->ndm_family); |
1680 | if (tbl == NULL) | |
1681 | return -EAFNOSUPPORT; | |
1da177e4 | 1682 | |
d7480fd3 WC |
1683 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1684 | goto out; | |
1685 | dst = nla_data(tb[NDA_DST]); | |
1686 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1687 | |
d7480fd3 WC |
1688 | if (ndm->ndm_flags & NTF_PROXY) { |
1689 | struct pneigh_entry *pn; | |
1690 | ||
1691 | err = -ENOBUFS; | |
1692 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1693 | if (pn) { | |
1694 | pn->flags = ndm->ndm_flags; | |
1695 | err = 0; | |
1696 | } | |
1697 | goto out; | |
1698 | } | |
1da177e4 | 1699 | |
d7480fd3 WC |
1700 | if (dev == NULL) |
1701 | goto out; | |
62dd9318 | 1702 | |
d7480fd3 WC |
1703 | neigh = neigh_lookup(tbl, dst, dev); |
1704 | if (neigh == NULL) { | |
1705 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1706 | err = -ENOENT; | |
110b2499 | 1707 | goto out; |
1da177e4 LT |
1708 | } |
1709 | ||
d7480fd3 WC |
1710 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1711 | if (IS_ERR(neigh)) { | |
1712 | err = PTR_ERR(neigh); | |
1713 | goto out; | |
1714 | } | |
1715 | } else { | |
1716 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1717 | err = -EEXIST; | |
1718 | neigh_release(neigh); | |
110b2499 | 1719 | goto out; |
5208debd | 1720 | } |
1da177e4 | 1721 | |
d7480fd3 WC |
1722 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1723 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1da177e4 LT |
1724 | } |
1725 | ||
d7480fd3 WC |
1726 | if (ndm->ndm_flags & NTF_USE) { |
1727 | neigh_event_send(neigh, NULL); | |
1728 | err = 0; | |
1729 | } else | |
1730 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
1731 | neigh_release(neigh); | |
1732 | ||
1da177e4 LT |
1733 | out: |
1734 | return err; | |
1735 | } | |
1736 | ||
c7fb64db TG |
1737 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1738 | { | |
ca860fb3 TG |
1739 | struct nlattr *nest; |
1740 | ||
1741 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1742 | if (nest == NULL) | |
1743 | return -ENOBUFS; | |
c7fb64db | 1744 | |
9a6308d7 DM |
1745 | if ((parms->dev && |
1746 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
1747 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || | |
1f9248e5 JP |
1748 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1749 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1750 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1751 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1752 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1753 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1754 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
1755 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
1756 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
1757 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
1758 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
1759 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
1760 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
1761 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
1762 | NDTPA_PAD) || | |
9a6308d7 | 1763 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 1764 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 1765 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 1766 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 1767 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 1768 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 1769 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 1770 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 1771 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 1772 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 1773 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 1774 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 1775 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
2175d87c | 1776 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD)) |
9a6308d7 | 1777 | goto nla_put_failure; |
ca860fb3 | 1778 | return nla_nest_end(skb, nest); |
c7fb64db | 1779 | |
ca860fb3 | 1780 | nla_put_failure: |
bc3ed28c TG |
1781 | nla_nest_cancel(skb, nest); |
1782 | return -EMSGSIZE; | |
c7fb64db TG |
1783 | } |
1784 | ||
ca860fb3 TG |
1785 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1786 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1787 | { |
1788 | struct nlmsghdr *nlh; | |
1789 | struct ndtmsg *ndtmsg; | |
1790 | ||
ca860fb3 TG |
1791 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1792 | if (nlh == NULL) | |
26932566 | 1793 | return -EMSGSIZE; |
c7fb64db | 1794 | |
ca860fb3 | 1795 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1796 | |
1797 | read_lock_bh(&tbl->lock); | |
1798 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1799 | ndtmsg->ndtm_pad1 = 0; |
1800 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1801 | |
9a6308d7 | 1802 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 1803 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
1804 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
1805 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
1806 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
1807 | goto nla_put_failure; | |
c7fb64db TG |
1808 | { |
1809 | unsigned long now = jiffies; | |
1810 | unsigned int flush_delta = now - tbl->last_flush; | |
1811 | unsigned int rand_delta = now - tbl->last_rand; | |
d6bf7817 | 1812 | struct neigh_hash_table *nht; |
c7fb64db TG |
1813 | struct ndt_config ndc = { |
1814 | .ndtc_key_len = tbl->key_len, | |
1815 | .ndtc_entry_size = tbl->entry_size, | |
1816 | .ndtc_entries = atomic_read(&tbl->entries), | |
1817 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1818 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
1819 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
1820 | }; | |
1821 | ||
d6bf7817 ED |
1822 | rcu_read_lock_bh(); |
1823 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 1824 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 1825 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
1826 | rcu_read_unlock_bh(); |
1827 | ||
9a6308d7 DM |
1828 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
1829 | goto nla_put_failure; | |
c7fb64db TG |
1830 | } |
1831 | ||
1832 | { | |
1833 | int cpu; | |
1834 | struct ndt_stats ndst; | |
1835 | ||
1836 | memset(&ndst, 0, sizeof(ndst)); | |
1837 | ||
6f912042 | 1838 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1839 | struct neigh_statistics *st; |
1840 | ||
c7fb64db TG |
1841 | st = per_cpu_ptr(tbl->stats, cpu); |
1842 | ndst.ndts_allocs += st->allocs; | |
1843 | ndst.ndts_destroys += st->destroys; | |
1844 | ndst.ndts_hash_grows += st->hash_grows; | |
1845 | ndst.ndts_res_failed += st->res_failed; | |
1846 | ndst.ndts_lookups += st->lookups; | |
1847 | ndst.ndts_hits += st->hits; | |
1848 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1849 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1850 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1851 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 1852 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
1853 | } |
1854 | ||
b676338f ND |
1855 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
1856 | NDTA_PAD)) | |
9a6308d7 | 1857 | goto nla_put_failure; |
c7fb64db TG |
1858 | } |
1859 | ||
1860 | BUG_ON(tbl->parms.dev); | |
1861 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1862 | goto nla_put_failure; |
c7fb64db TG |
1863 | |
1864 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1865 | nlmsg_end(skb, nlh); |
1866 | return 0; | |
c7fb64db | 1867 | |
ca860fb3 | 1868 | nla_put_failure: |
c7fb64db | 1869 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1870 | nlmsg_cancel(skb, nlh); |
1871 | return -EMSGSIZE; | |
c7fb64db TG |
1872 | } |
1873 | ||
ca860fb3 TG |
1874 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1875 | struct neigh_table *tbl, | |
c7fb64db | 1876 | struct neigh_parms *parms, |
ca860fb3 TG |
1877 | u32 pid, u32 seq, int type, |
1878 | unsigned int flags) | |
c7fb64db TG |
1879 | { |
1880 | struct ndtmsg *ndtmsg; | |
1881 | struct nlmsghdr *nlh; | |
1882 | ||
ca860fb3 TG |
1883 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1884 | if (nlh == NULL) | |
26932566 | 1885 | return -EMSGSIZE; |
c7fb64db | 1886 | |
ca860fb3 | 1887 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1888 | |
1889 | read_lock_bh(&tbl->lock); | |
1890 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1891 | ndtmsg->ndtm_pad1 = 0; |
1892 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1893 | |
ca860fb3 TG |
1894 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1895 | neightbl_fill_parms(skb, parms) < 0) | |
1896 | goto errout; | |
c7fb64db TG |
1897 | |
1898 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1899 | nlmsg_end(skb, nlh); |
1900 | return 0; | |
ca860fb3 | 1901 | errout: |
c7fb64db | 1902 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1903 | nlmsg_cancel(skb, nlh); |
1904 | return -EMSGSIZE; | |
c7fb64db | 1905 | } |
4ec93edb | 1906 | |
ef7c79ed | 1907 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1908 | [NDTA_NAME] = { .type = NLA_STRING }, |
1909 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1910 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1911 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1912 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1913 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1914 | }; | |
1915 | ||
ef7c79ed | 1916 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1917 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1918 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1919 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1920 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1921 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1922 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 1923 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
1924 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
1925 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1926 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1927 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1928 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1929 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1930 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1931 | }; | |
1932 | ||
661d2967 | 1933 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
c7fb64db | 1934 | { |
3b1e0a65 | 1935 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1936 | struct neigh_table *tbl; |
6b3f8674 TG |
1937 | struct ndtmsg *ndtmsg; |
1938 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
1939 | bool found = false; |
1940 | int err, tidx; | |
c7fb64db | 1941 | |
6b3f8674 TG |
1942 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1943 | nl_neightbl_policy); | |
1944 | if (err < 0) | |
1945 | goto errout; | |
c7fb64db | 1946 | |
6b3f8674 TG |
1947 | if (tb[NDTA_NAME] == NULL) { |
1948 | err = -EINVAL; | |
1949 | goto errout; | |
1950 | } | |
1951 | ||
1952 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
1953 | |
1954 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
1955 | tbl = neigh_tables[tidx]; | |
1956 | if (!tbl) | |
1957 | continue; | |
c7fb64db TG |
1958 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
1959 | continue; | |
d7480fd3 WC |
1960 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
1961 | found = true; | |
c7fb64db | 1962 | break; |
d7480fd3 | 1963 | } |
c7fb64db TG |
1964 | } |
1965 | ||
d7480fd3 WC |
1966 | if (!found) |
1967 | return -ENOENT; | |
c7fb64db | 1968 | |
4ec93edb | 1969 | /* |
c7fb64db TG |
1970 | * We acquire tbl->lock to be nice to the periodic timers and |
1971 | * make sure they always see a consistent set of values. | |
1972 | */ | |
1973 | write_lock_bh(&tbl->lock); | |
1974 | ||
6b3f8674 TG |
1975 | if (tb[NDTA_PARMS]) { |
1976 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1977 | struct neigh_parms *p; |
6b3f8674 | 1978 | int i, ifindex = 0; |
c7fb64db | 1979 | |
6b3f8674 TG |
1980 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1981 | nl_ntbl_parm_policy); | |
1982 | if (err < 0) | |
1983 | goto errout_tbl_lock; | |
c7fb64db | 1984 | |
6b3f8674 TG |
1985 | if (tbp[NDTPA_IFINDEX]) |
1986 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1987 | |
97fd5bc7 | 1988 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
1989 | if (p == NULL) { |
1990 | err = -ENOENT; | |
6b3f8674 | 1991 | goto errout_tbl_lock; |
c7fb64db | 1992 | } |
c7fb64db | 1993 | |
6b3f8674 TG |
1994 | for (i = 1; i <= NDTPA_MAX; i++) { |
1995 | if (tbp[i] == NULL) | |
1996 | continue; | |
c7fb64db | 1997 | |
6b3f8674 TG |
1998 | switch (i) { |
1999 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2000 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2001 | nla_get_u32(tbp[i]) * | |
2002 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2003 | break; |
2004 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2005 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2006 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2007 | break; |
2008 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2009 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2010 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2011 | break; |
2012 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2013 | NEIGH_VAR_SET(p, APP_PROBES, |
2014 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2015 | break; |
2016 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2017 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2018 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2019 | break; |
2020 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2021 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2022 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2023 | break; |
8da86466 YH |
2024 | case NDTPA_MCAST_REPROBES: |
2025 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2026 | nla_get_u32(tbp[i])); | |
2027 | break; | |
6b3f8674 | 2028 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2029 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2030 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2031 | /* update reachable_time as well, otherwise, the change will |
2032 | * only be effective after the next time neigh_periodic_work | |
2033 | * decides to recompute it (can be multiple minutes) | |
2034 | */ | |
2035 | p->reachable_time = | |
2036 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2037 | break; |
2038 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2039 | NEIGH_VAR_SET(p, GC_STALETIME, |
2040 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2041 | break; |
2042 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2043 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2044 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2045 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 TG |
2046 | break; |
2047 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2048 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2049 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2050 | break; |
2051 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2052 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2053 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2054 | break; |
2055 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2056 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2057 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2058 | break; |
2059 | case NDTPA_LOCKTIME: | |
3977458c JP |
2060 | NEIGH_VAR_SET(p, LOCKTIME, |
2061 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2062 | break; |
2063 | } | |
2064 | } | |
2065 | } | |
c7fb64db | 2066 | |
dc25c676 G |
2067 | err = -ENOENT; |
2068 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2069 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2070 | !net_eq(net, &init_net)) | |
2071 | goto errout_tbl_lock; | |
2072 | ||
6b3f8674 TG |
2073 | if (tb[NDTA_THRESH1]) |
2074 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2075 | |
6b3f8674 TG |
2076 | if (tb[NDTA_THRESH2]) |
2077 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2078 | |
6b3f8674 TG |
2079 | if (tb[NDTA_THRESH3]) |
2080 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2081 | |
6b3f8674 TG |
2082 | if (tb[NDTA_GC_INTERVAL]) |
2083 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2084 | |
2085 | err = 0; | |
2086 | ||
6b3f8674 | 2087 | errout_tbl_lock: |
c7fb64db | 2088 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2089 | errout: |
c7fb64db TG |
2090 | return err; |
2091 | } | |
2092 | ||
c8822a4e | 2093 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2094 | { |
3b1e0a65 | 2095 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2096 | int family, tidx, nidx = 0; |
2097 | int tbl_skip = cb->args[0]; | |
2098 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2099 | struct neigh_table *tbl; |
2100 | ||
ca860fb3 | 2101 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db | 2102 | |
d7480fd3 | 2103 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2104 | struct neigh_parms *p; |
2105 | ||
d7480fd3 WC |
2106 | tbl = neigh_tables[tidx]; |
2107 | if (!tbl) | |
2108 | continue; | |
2109 | ||
ca860fb3 | 2110 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2111 | continue; |
2112 | ||
15e47304 | 2113 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
ca860fb3 | 2114 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2115 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2116 | break; |
2117 | ||
75fbfd33 ND |
2118 | nidx = 0; |
2119 | p = list_next_entry(&tbl->parms, list); | |
2120 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2121 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2122 | continue; |
2123 | ||
efc683fc GK |
2124 | if (nidx < neigh_skip) |
2125 | goto next; | |
c7fb64db | 2126 | |
ca860fb3 | 2127 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2128 | NETLINK_CB(cb->skb).portid, |
ca860fb3 TG |
2129 | cb->nlh->nlmsg_seq, |
2130 | RTM_NEWNEIGHTBL, | |
7b46a644 | 2131 | NLM_F_MULTI) < 0) |
c7fb64db | 2132 | goto out; |
efc683fc GK |
2133 | next: |
2134 | nidx++; | |
c7fb64db TG |
2135 | } |
2136 | ||
ca860fb3 | 2137 | neigh_skip = 0; |
c7fb64db TG |
2138 | } |
2139 | out: | |
ca860fb3 TG |
2140 | cb->args[0] = tidx; |
2141 | cb->args[1] = nidx; | |
c7fb64db TG |
2142 | |
2143 | return skb->len; | |
2144 | } | |
1da177e4 | 2145 | |
8b8aec50 TG |
2146 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2147 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2148 | { |
2149 | unsigned long now = jiffies; | |
1da177e4 | 2150 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2151 | struct nlmsghdr *nlh; |
2152 | struct ndmsg *ndm; | |
2153 | ||
2154 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2155 | if (nlh == NULL) | |
26932566 | 2156 | return -EMSGSIZE; |
1da177e4 | 2157 | |
8b8aec50 TG |
2158 | ndm = nlmsg_data(nlh); |
2159 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2160 | ndm->ndm_pad1 = 0; |
2161 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2162 | ndm->ndm_flags = neigh->flags; |
2163 | ndm->ndm_type = neigh->type; | |
2164 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2165 | |
9a6308d7 DM |
2166 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2167 | goto nla_put_failure; | |
8b8aec50 TG |
2168 | |
2169 | read_lock_bh(&neigh->lock); | |
2170 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2171 | if (neigh->nud_state & NUD_VALID) { |
2172 | char haddr[MAX_ADDR_LEN]; | |
2173 | ||
2174 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2175 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2176 | read_unlock_bh(&neigh->lock); | |
2177 | goto nla_put_failure; | |
2178 | } | |
8b8aec50 TG |
2179 | } |
2180 | ||
b9f5f52c SH |
2181 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2182 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2183 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2184 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2185 | read_unlock_bh(&neigh->lock); | |
2186 | ||
9a6308d7 DM |
2187 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2188 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2189 | goto nla_put_failure; | |
8b8aec50 | 2190 | |
053c095a JB |
2191 | nlmsg_end(skb, nlh); |
2192 | return 0; | |
8b8aec50 TG |
2193 | |
2194 | nla_put_failure: | |
26932566 PM |
2195 | nlmsg_cancel(skb, nlh); |
2196 | return -EMSGSIZE; | |
1da177e4 LT |
2197 | } |
2198 | ||
84920c14 TZ |
2199 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2200 | u32 pid, u32 seq, int type, unsigned int flags, | |
2201 | struct neigh_table *tbl) | |
2202 | { | |
2203 | struct nlmsghdr *nlh; | |
2204 | struct ndmsg *ndm; | |
2205 | ||
2206 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2207 | if (nlh == NULL) | |
2208 | return -EMSGSIZE; | |
2209 | ||
2210 | ndm = nlmsg_data(nlh); | |
2211 | ndm->ndm_family = tbl->family; | |
2212 | ndm->ndm_pad1 = 0; | |
2213 | ndm->ndm_pad2 = 0; | |
2214 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2215 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2216 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2217 | ndm->ndm_state = NUD_NONE; |
2218 | ||
9a6308d7 DM |
2219 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2220 | goto nla_put_failure; | |
84920c14 | 2221 | |
053c095a JB |
2222 | nlmsg_end(skb, nlh); |
2223 | return 0; | |
84920c14 TZ |
2224 | |
2225 | nla_put_failure: | |
2226 | nlmsg_cancel(skb, nlh); | |
2227 | return -EMSGSIZE; | |
2228 | } | |
2229 | ||
d961db35 TG |
2230 | static void neigh_update_notify(struct neighbour *neigh) |
2231 | { | |
2232 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2233 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2234 | } | |
1da177e4 | 2235 | |
21fdd092 DA |
2236 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2237 | { | |
2238 | struct net_device *master; | |
2239 | ||
2240 | if (!master_idx) | |
2241 | return false; | |
2242 | ||
2243 | master = netdev_master_upper_dev_get(dev); | |
2244 | if (!master || master->ifindex != master_idx) | |
2245 | return true; | |
2246 | ||
2247 | return false; | |
2248 | } | |
2249 | ||
16660f0b DA |
2250 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2251 | { | |
2252 | if (filter_idx && dev->ifindex != filter_idx) | |
2253 | return true; | |
2254 | ||
2255 | return false; | |
2256 | } | |
2257 | ||
1da177e4 LT |
2258 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2259 | struct netlink_callback *cb) | |
2260 | { | |
767e97e1 | 2261 | struct net *net = sock_net(skb->sk); |
21fdd092 DA |
2262 | const struct nlmsghdr *nlh = cb->nlh; |
2263 | struct nlattr *tb[NDA_MAX + 1]; | |
1da177e4 LT |
2264 | struct neighbour *n; |
2265 | int rc, h, s_h = cb->args[1]; | |
2266 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2267 | struct neigh_hash_table *nht; |
16660f0b | 2268 | int filter_master_idx = 0, filter_idx = 0; |
21fdd092 DA |
2269 | unsigned int flags = NLM_F_MULTI; |
2270 | int err; | |
2271 | ||
2272 | err = nlmsg_parse(nlh, sizeof(struct ndmsg), tb, NDA_MAX, NULL); | |
2273 | if (!err) { | |
16660f0b DA |
2274 | if (tb[NDA_IFINDEX]) |
2275 | filter_idx = nla_get_u32(tb[NDA_IFINDEX]); | |
2276 | ||
21fdd092 DA |
2277 | if (tb[NDA_MASTER]) |
2278 | filter_master_idx = nla_get_u32(tb[NDA_MASTER]); | |
2279 | ||
16660f0b | 2280 | if (filter_idx || filter_master_idx) |
21fdd092 DA |
2281 | flags |= NLM_F_DUMP_FILTERED; |
2282 | } | |
1da177e4 | 2283 | |
d6bf7817 ED |
2284 | rcu_read_lock_bh(); |
2285 | nht = rcu_dereference_bh(tbl->nht); | |
2286 | ||
4bd6683b | 2287 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2288 | if (h > s_h) |
2289 | s_idx = 0; | |
767e97e1 ED |
2290 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2291 | n != NULL; | |
2292 | n = rcu_dereference_bh(n->next)) { | |
09ad9bc7 | 2293 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2294 | continue; |
16660f0b DA |
2295 | if (neigh_ifindex_filtered(n->dev, filter_idx)) |
2296 | continue; | |
21fdd092 DA |
2297 | if (neigh_master_filtered(n->dev, filter_master_idx)) |
2298 | continue; | |
efc683fc GK |
2299 | if (idx < s_idx) |
2300 | goto next; | |
15e47304 | 2301 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2302 | cb->nlh->nlmsg_seq, |
b6544c0b | 2303 | RTM_NEWNEIGH, |
21fdd092 | 2304 | flags) < 0) { |
1da177e4 LT |
2305 | rc = -1; |
2306 | goto out; | |
2307 | } | |
767e97e1 | 2308 | next: |
efc683fc | 2309 | idx++; |
1da177e4 | 2310 | } |
1da177e4 LT |
2311 | } |
2312 | rc = skb->len; | |
2313 | out: | |
d6bf7817 | 2314 | rcu_read_unlock_bh(); |
1da177e4 LT |
2315 | cb->args[1] = h; |
2316 | cb->args[2] = idx; | |
2317 | return rc; | |
2318 | } | |
2319 | ||
84920c14 TZ |
2320 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2321 | struct netlink_callback *cb) | |
2322 | { | |
2323 | struct pneigh_entry *n; | |
2324 | struct net *net = sock_net(skb->sk); | |
2325 | int rc, h, s_h = cb->args[3]; | |
2326 | int idx, s_idx = idx = cb->args[4]; | |
2327 | ||
2328 | read_lock_bh(&tbl->lock); | |
2329 | ||
4bd6683b | 2330 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2331 | if (h > s_h) |
2332 | s_idx = 0; | |
2333 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
6adc5fd6 | 2334 | if (pneigh_net(n) != net) |
84920c14 TZ |
2335 | continue; |
2336 | if (idx < s_idx) | |
2337 | goto next; | |
15e47304 | 2338 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 TZ |
2339 | cb->nlh->nlmsg_seq, |
2340 | RTM_NEWNEIGH, | |
7b46a644 | 2341 | NLM_F_MULTI, tbl) < 0) { |
84920c14 TZ |
2342 | read_unlock_bh(&tbl->lock); |
2343 | rc = -1; | |
2344 | goto out; | |
2345 | } | |
2346 | next: | |
2347 | idx++; | |
2348 | } | |
2349 | } | |
2350 | ||
2351 | read_unlock_bh(&tbl->lock); | |
2352 | rc = skb->len; | |
2353 | out: | |
2354 | cb->args[3] = h; | |
2355 | cb->args[4] = idx; | |
2356 | return rc; | |
2357 | ||
2358 | } | |
2359 | ||
c8822a4e | 2360 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2361 | { |
2362 | struct neigh_table *tbl; | |
2363 | int t, family, s_t; | |
84920c14 | 2364 | int proxy = 0; |
4bd6683b | 2365 | int err; |
1da177e4 | 2366 | |
8b8aec50 | 2367 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
84920c14 TZ |
2368 | |
2369 | /* check for full ndmsg structure presence, family member is | |
2370 | * the same for both structures | |
2371 | */ | |
2372 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && | |
2373 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) | |
2374 | proxy = 1; | |
2375 | ||
1da177e4 LT |
2376 | s_t = cb->args[0]; |
2377 | ||
d7480fd3 WC |
2378 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2379 | tbl = neigh_tables[t]; | |
2380 | ||
2381 | if (!tbl) | |
2382 | continue; | |
1da177e4 LT |
2383 | if (t < s_t || (family && tbl->family != family)) |
2384 | continue; | |
2385 | if (t > s_t) | |
2386 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2387 | sizeof(cb->args[0])); | |
84920c14 TZ |
2388 | if (proxy) |
2389 | err = pneigh_dump_table(tbl, skb, cb); | |
2390 | else | |
2391 | err = neigh_dump_table(tbl, skb, cb); | |
4bd6683b ED |
2392 | if (err < 0) |
2393 | break; | |
1da177e4 | 2394 | } |
1da177e4 LT |
2395 | |
2396 | cb->args[0] = t; | |
2397 | return skb->len; | |
2398 | } | |
2399 | ||
2400 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2401 | { | |
2402 | int chain; | |
d6bf7817 | 2403 | struct neigh_hash_table *nht; |
1da177e4 | 2404 | |
d6bf7817 ED |
2405 | rcu_read_lock_bh(); |
2406 | nht = rcu_dereference_bh(tbl->nht); | |
2407 | ||
767e97e1 | 2408 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2409 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2410 | struct neighbour *n; |
2411 | ||
767e97e1 ED |
2412 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2413 | n != NULL; | |
2414 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2415 | cb(n, cookie); |
2416 | } | |
d6bf7817 ED |
2417 | read_unlock(&tbl->lock); |
2418 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2419 | } |
2420 | EXPORT_SYMBOL(neigh_for_each); | |
2421 | ||
2422 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2423 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2424 | int (*cb)(struct neighbour *)) | |
2425 | { | |
2426 | int chain; | |
d6bf7817 | 2427 | struct neigh_hash_table *nht; |
1da177e4 | 2428 | |
d6bf7817 ED |
2429 | nht = rcu_dereference_protected(tbl->nht, |
2430 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2431 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2432 | struct neighbour *n; |
2433 | struct neighbour __rcu **np; | |
1da177e4 | 2434 | |
d6bf7817 | 2435 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2436 | while ((n = rcu_dereference_protected(*np, |
2437 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2438 | int release; |
2439 | ||
2440 | write_lock(&n->lock); | |
2441 | release = cb(n); | |
2442 | if (release) { | |
767e97e1 ED |
2443 | rcu_assign_pointer(*np, |
2444 | rcu_dereference_protected(n->next, | |
2445 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
2446 | n->dead = 1; |
2447 | } else | |
2448 | np = &n->next; | |
2449 | write_unlock(&n->lock); | |
4f494554 TG |
2450 | if (release) |
2451 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2452 | } |
2453 | } | |
2454 | } | |
2455 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2456 | ||
b79bda3d | 2457 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2458 | const void *addr, struct sk_buff *skb) |
2459 | { | |
b79bda3d EB |
2460 | int err = -EAFNOSUPPORT; |
2461 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2462 | struct neigh_table *tbl; |
2463 | struct neighbour *neigh; | |
2464 | ||
b79bda3d | 2465 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2466 | if (!tbl) |
2467 | goto out; | |
b560f03d | 2468 | rcu_read_lock_bh(); |
4fd3d7d9 EB |
2469 | neigh = __neigh_lookup_noref(tbl, addr, dev); |
2470 | if (!neigh) | |
2471 | neigh = __neigh_create(tbl, addr, dev, false); | |
2472 | err = PTR_ERR(neigh); | |
b560f03d DB |
2473 | if (IS_ERR(neigh)) { |
2474 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 2475 | goto out_kfree_skb; |
b560f03d | 2476 | } |
4fd3d7d9 | 2477 | err = neigh->output(neigh, skb); |
b560f03d | 2478 | rcu_read_unlock_bh(); |
4fd3d7d9 | 2479 | } |
b79bda3d EB |
2480 | else if (index == NEIGH_LINK_TABLE) { |
2481 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
2482 | addr, NULL, skb->len); | |
2483 | if (err < 0) | |
2484 | goto out_kfree_skb; | |
2485 | err = dev_queue_xmit(skb); | |
2486 | } | |
4fd3d7d9 EB |
2487 | out: |
2488 | return err; | |
2489 | out_kfree_skb: | |
2490 | kfree_skb(skb); | |
2491 | goto out; | |
2492 | } | |
2493 | EXPORT_SYMBOL(neigh_xmit); | |
2494 | ||
1da177e4 LT |
2495 | #ifdef CONFIG_PROC_FS |
2496 | ||
2497 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2498 | { | |
2499 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2500 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2501 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2502 | struct neighbour *n = NULL; |
2503 | int bucket = state->bucket; | |
2504 | ||
2505 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 2506 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 2507 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
2508 | |
2509 | while (n) { | |
878628fb | 2510 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2511 | goto next; |
1da177e4 LT |
2512 | if (state->neigh_sub_iter) { |
2513 | loff_t fakep = 0; | |
2514 | void *v; | |
2515 | ||
2516 | v = state->neigh_sub_iter(state, n, &fakep); | |
2517 | if (!v) | |
2518 | goto next; | |
2519 | } | |
2520 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2521 | break; | |
2522 | if (n->nud_state & ~NUD_NOARP) | |
2523 | break; | |
767e97e1 ED |
2524 | next: |
2525 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2526 | } |
2527 | ||
2528 | if (n) | |
2529 | break; | |
2530 | } | |
2531 | state->bucket = bucket; | |
2532 | ||
2533 | return n; | |
2534 | } | |
2535 | ||
2536 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2537 | struct neighbour *n, | |
2538 | loff_t *pos) | |
2539 | { | |
2540 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2541 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2542 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2543 | |
2544 | if (state->neigh_sub_iter) { | |
2545 | void *v = state->neigh_sub_iter(state, n, pos); | |
2546 | if (v) | |
2547 | return n; | |
2548 | } | |
767e97e1 | 2549 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
2550 | |
2551 | while (1) { | |
2552 | while (n) { | |
878628fb | 2553 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2554 | goto next; |
1da177e4 LT |
2555 | if (state->neigh_sub_iter) { |
2556 | void *v = state->neigh_sub_iter(state, n, pos); | |
2557 | if (v) | |
2558 | return n; | |
2559 | goto next; | |
2560 | } | |
2561 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2562 | break; | |
2563 | ||
2564 | if (n->nud_state & ~NUD_NOARP) | |
2565 | break; | |
767e97e1 ED |
2566 | next: |
2567 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2568 | } |
2569 | ||
2570 | if (n) | |
2571 | break; | |
2572 | ||
cd089336 | 2573 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
2574 | break; |
2575 | ||
767e97e1 | 2576 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
2577 | } |
2578 | ||
2579 | if (n && pos) | |
2580 | --(*pos); | |
2581 | return n; | |
2582 | } | |
2583 | ||
2584 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2585 | { | |
2586 | struct neighbour *n = neigh_get_first(seq); | |
2587 | ||
2588 | if (n) { | |
745e2031 | 2589 | --(*pos); |
1da177e4 LT |
2590 | while (*pos) { |
2591 | n = neigh_get_next(seq, n, pos); | |
2592 | if (!n) | |
2593 | break; | |
2594 | } | |
2595 | } | |
2596 | return *pos ? NULL : n; | |
2597 | } | |
2598 | ||
2599 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2600 | { | |
2601 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2602 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2603 | struct neigh_table *tbl = state->tbl; |
2604 | struct pneigh_entry *pn = NULL; | |
2605 | int bucket = state->bucket; | |
2606 | ||
2607 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2608 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2609 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2610 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2611 | pn = pn->next; |
1da177e4 LT |
2612 | if (pn) |
2613 | break; | |
2614 | } | |
2615 | state->bucket = bucket; | |
2616 | ||
2617 | return pn; | |
2618 | } | |
2619 | ||
2620 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2621 | struct pneigh_entry *pn, | |
2622 | loff_t *pos) | |
2623 | { | |
2624 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2625 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2626 | struct neigh_table *tbl = state->tbl; |
2627 | ||
df07a94c JBD |
2628 | do { |
2629 | pn = pn->next; | |
2630 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
2631 | ||
1da177e4 LT |
2632 | while (!pn) { |
2633 | if (++state->bucket > PNEIGH_HASHMASK) | |
2634 | break; | |
2635 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2636 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2637 | pn = pn->next; |
1da177e4 LT |
2638 | if (pn) |
2639 | break; | |
2640 | } | |
2641 | ||
2642 | if (pn && pos) | |
2643 | --(*pos); | |
2644 | ||
2645 | return pn; | |
2646 | } | |
2647 | ||
2648 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2649 | { | |
2650 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2651 | ||
2652 | if (pn) { | |
745e2031 | 2653 | --(*pos); |
1da177e4 LT |
2654 | while (*pos) { |
2655 | pn = pneigh_get_next(seq, pn, pos); | |
2656 | if (!pn) | |
2657 | break; | |
2658 | } | |
2659 | } | |
2660 | return *pos ? NULL : pn; | |
2661 | } | |
2662 | ||
2663 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2664 | { | |
2665 | struct neigh_seq_state *state = seq->private; | |
2666 | void *rc; | |
745e2031 | 2667 | loff_t idxpos = *pos; |
1da177e4 | 2668 | |
745e2031 | 2669 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2670 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2671 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2672 | |
2673 | return rc; | |
2674 | } | |
2675 | ||
2676 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
d6bf7817 | 2677 | __acquires(rcu_bh) |
1da177e4 LT |
2678 | { |
2679 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2680 | |
2681 | state->tbl = tbl; | |
2682 | state->bucket = 0; | |
2683 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2684 | ||
d6bf7817 ED |
2685 | rcu_read_lock_bh(); |
2686 | state->nht = rcu_dereference_bh(tbl->nht); | |
767e97e1 | 2687 | |
745e2031 | 2688 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2689 | } |
2690 | EXPORT_SYMBOL(neigh_seq_start); | |
2691 | ||
2692 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2693 | { | |
2694 | struct neigh_seq_state *state; | |
2695 | void *rc; | |
2696 | ||
2697 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2698 | rc = neigh_get_first(seq); |
1da177e4 LT |
2699 | goto out; |
2700 | } | |
2701 | ||
2702 | state = seq->private; | |
2703 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2704 | rc = neigh_get_next(seq, v, NULL); | |
2705 | if (rc) | |
2706 | goto out; | |
2707 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2708 | rc = pneigh_get_first(seq); | |
2709 | } else { | |
2710 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2711 | rc = pneigh_get_next(seq, v, NULL); | |
2712 | } | |
2713 | out: | |
2714 | ++(*pos); | |
2715 | return rc; | |
2716 | } | |
2717 | EXPORT_SYMBOL(neigh_seq_next); | |
2718 | ||
2719 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
d6bf7817 | 2720 | __releases(rcu_bh) |
1da177e4 | 2721 | { |
d6bf7817 | 2722 | rcu_read_unlock_bh(); |
1da177e4 LT |
2723 | } |
2724 | EXPORT_SYMBOL(neigh_seq_stop); | |
2725 | ||
2726 | /* statistics via seq_file */ | |
2727 | ||
2728 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2729 | { | |
81c1ebfc | 2730 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2731 | int cpu; |
2732 | ||
2733 | if (*pos == 0) | |
2734 | return SEQ_START_TOKEN; | |
4ec93edb | 2735 | |
0f23174a | 2736 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2737 | if (!cpu_possible(cpu)) |
2738 | continue; | |
2739 | *pos = cpu+1; | |
2740 | return per_cpu_ptr(tbl->stats, cpu); | |
2741 | } | |
2742 | return NULL; | |
2743 | } | |
2744 | ||
2745 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2746 | { | |
81c1ebfc | 2747 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2748 | int cpu; |
2749 | ||
0f23174a | 2750 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2751 | if (!cpu_possible(cpu)) |
2752 | continue; | |
2753 | *pos = cpu+1; | |
2754 | return per_cpu_ptr(tbl->stats, cpu); | |
2755 | } | |
2756 | return NULL; | |
2757 | } | |
2758 | ||
2759 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2760 | { | |
2761 | ||
2762 | } | |
2763 | ||
2764 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2765 | { | |
81c1ebfc | 2766 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2767 | struct neigh_statistics *st = v; |
2768 | ||
2769 | if (v == SEQ_START_TOKEN) { | |
fb811395 | 2770 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs unresolved_discards table_fulls\n"); |
1da177e4 LT |
2771 | return 0; |
2772 | } | |
2773 | ||
2774 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
fb811395 | 2775 | "%08lx %08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2776 | atomic_read(&tbl->entries), |
2777 | ||
2778 | st->allocs, | |
2779 | st->destroys, | |
2780 | st->hash_grows, | |
2781 | ||
2782 | st->lookups, | |
2783 | st->hits, | |
2784 | ||
2785 | st->res_failed, | |
2786 | ||
2787 | st->rcv_probes_mcast, | |
2788 | st->rcv_probes_ucast, | |
2789 | ||
2790 | st->periodic_gc_runs, | |
9a6d276e | 2791 | st->forced_gc_runs, |
fb811395 RJ |
2792 | st->unres_discards, |
2793 | st->table_fulls | |
1da177e4 LT |
2794 | ); |
2795 | ||
2796 | return 0; | |
2797 | } | |
2798 | ||
f690808e | 2799 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2800 | .start = neigh_stat_seq_start, |
2801 | .next = neigh_stat_seq_next, | |
2802 | .stop = neigh_stat_seq_stop, | |
2803 | .show = neigh_stat_seq_show, | |
2804 | }; | |
2805 | ||
2806 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2807 | { | |
2808 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2809 | ||
2810 | if (!ret) { | |
2811 | struct seq_file *sf = file->private_data; | |
d9dda78b | 2812 | sf->private = PDE_DATA(inode); |
1da177e4 LT |
2813 | } |
2814 | return ret; | |
2815 | }; | |
2816 | ||
9a32144e | 2817 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2818 | .owner = THIS_MODULE, |
2819 | .open = neigh_stat_seq_open, | |
2820 | .read = seq_read, | |
2821 | .llseek = seq_lseek, | |
2822 | .release = seq_release, | |
2823 | }; | |
2824 | ||
2825 | #endif /* CONFIG_PROC_FS */ | |
2826 | ||
339bf98f TG |
2827 | static inline size_t neigh_nlmsg_size(void) |
2828 | { | |
2829 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2830 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2831 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2832 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2833 | + nla_total_size(4); /* NDA_PROBES */ | |
2834 | } | |
2835 | ||
b8673311 | 2836 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2837 | { |
c346dca1 | 2838 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2839 | struct sk_buff *skb; |
b8673311 | 2840 | int err = -ENOBUFS; |
1da177e4 | 2841 | |
339bf98f | 2842 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2843 | if (skb == NULL) |
b8673311 | 2844 | goto errout; |
1da177e4 | 2845 | |
b8673311 | 2846 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2847 | if (err < 0) { |
2848 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2849 | WARN_ON(err == -EMSGSIZE); | |
2850 | kfree_skb(skb); | |
2851 | goto errout; | |
2852 | } | |
1ce85fe4 PNA |
2853 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2854 | return; | |
b8673311 TG |
2855 | errout: |
2856 | if (err < 0) | |
426b5303 | 2857 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2858 | } |
2859 | ||
b8673311 | 2860 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2861 | { |
b8673311 TG |
2862 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2863 | } | |
0a204500 | 2864 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2865 | |
2866 | #ifdef CONFIG_SYSCTL | |
b93196dc | 2867 | static int zero; |
555445cd | 2868 | static int int_max = INT_MAX; |
b93196dc | 2869 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 2870 | |
fe2c6338 JP |
2871 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
2872 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
2873 | { |
2874 | int size, ret; | |
fe2c6338 | 2875 | struct ctl_table tmp = *ctl; |
8b5c171b | 2876 | |
ce46cc64 SW |
2877 | tmp.extra1 = &zero; |
2878 | tmp.extra2 = &unres_qlen_max; | |
8b5c171b | 2879 | tmp.data = &size; |
ce46cc64 SW |
2880 | |
2881 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
2882 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2883 | ||
8b5c171b ED |
2884 | if (write && !ret) |
2885 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
2886 | return ret; | |
2887 | } | |
2888 | ||
1d4c8c29 JP |
2889 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
2890 | int family) | |
2891 | { | |
bba24896 JP |
2892 | switch (family) { |
2893 | case AF_INET: | |
1d4c8c29 | 2894 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
2895 | case AF_INET6: |
2896 | return __in6_dev_nd_parms_get_rcu(dev); | |
2897 | } | |
1d4c8c29 JP |
2898 | return NULL; |
2899 | } | |
2900 | ||
2901 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
2902 | int index) | |
2903 | { | |
2904 | struct net_device *dev; | |
2905 | int family = neigh_parms_family(p); | |
2906 | ||
2907 | rcu_read_lock(); | |
2908 | for_each_netdev_rcu(net, dev) { | |
2909 | struct neigh_parms *dst_p = | |
2910 | neigh_get_dev_parms_rcu(dev, family); | |
2911 | ||
2912 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
2913 | dst_p->data[index] = p->data[index]; | |
2914 | } | |
2915 | rcu_read_unlock(); | |
2916 | } | |
2917 | ||
2918 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
2919 | { | |
2920 | struct net_device *dev = ctl->extra1; | |
2921 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 2922 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
2923 | int index = (int *) ctl->data - p->data; |
2924 | ||
2925 | if (!write) | |
2926 | return; | |
2927 | ||
2928 | set_bit(index, p->data_state); | |
2a4501ae | 2929 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
1d4c8c29 JP |
2930 | if (!dev) /* NULL dev means this is default value */ |
2931 | neigh_copy_dflt_parms(net, p, index); | |
2932 | } | |
2933 | ||
1f9248e5 JP |
2934 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
2935 | void __user *buffer, | |
2936 | size_t *lenp, loff_t *ppos) | |
2937 | { | |
2938 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 2939 | int ret; |
1f9248e5 JP |
2940 | |
2941 | tmp.extra1 = &zero; | |
2942 | tmp.extra2 = &int_max; | |
2943 | ||
1d4c8c29 JP |
2944 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
2945 | neigh_proc_update(ctl, write); | |
2946 | return ret; | |
1f9248e5 JP |
2947 | } |
2948 | ||
cb5b09c1 JP |
2949 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
2950 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2951 | { | |
1d4c8c29 JP |
2952 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
2953 | ||
2954 | neigh_proc_update(ctl, write); | |
2955 | return ret; | |
cb5b09c1 JP |
2956 | } |
2957 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
2958 | ||
2959 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
2960 | void __user *buffer, | |
2961 | size_t *lenp, loff_t *ppos) | |
2962 | { | |
1d4c8c29 JP |
2963 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
2964 | ||
2965 | neigh_proc_update(ctl, write); | |
2966 | return ret; | |
cb5b09c1 JP |
2967 | } |
2968 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
2969 | ||
2970 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
2971 | void __user *buffer, | |
2972 | size_t *lenp, loff_t *ppos) | |
2973 | { | |
1d4c8c29 JP |
2974 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
2975 | ||
2976 | neigh_proc_update(ctl, write); | |
2977 | return ret; | |
cb5b09c1 JP |
2978 | } |
2979 | ||
2980 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
2981 | void __user *buffer, | |
2982 | size_t *lenp, loff_t *ppos) | |
2983 | { | |
1d4c8c29 JP |
2984 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
2985 | ||
2986 | neigh_proc_update(ctl, write); | |
2987 | return ret; | |
cb5b09c1 JP |
2988 | } |
2989 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
2990 | ||
2991 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
2992 | void __user *buffer, | |
2993 | size_t *lenp, loff_t *ppos) | |
2994 | { | |
1d4c8c29 JP |
2995 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
2996 | ||
2997 | neigh_proc_update(ctl, write); | |
2998 | return ret; | |
cb5b09c1 JP |
2999 | } |
3000 | ||
4bf6980d JFR |
3001 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
3002 | void __user *buffer, | |
3003 | size_t *lenp, loff_t *ppos) | |
3004 | { | |
3005 | struct neigh_parms *p = ctl->extra2; | |
3006 | int ret; | |
3007 | ||
3008 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3009 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3010 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3011 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3012 | else | |
3013 | ret = -1; | |
3014 | ||
3015 | if (write && ret == 0) { | |
3016 | /* update reachable_time as well, otherwise, the change will | |
3017 | * only be effective after the next time neigh_periodic_work | |
3018 | * decides to recompute it | |
3019 | */ | |
3020 | p->reachable_time = | |
3021 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3022 | } | |
3023 | return ret; | |
3024 | } | |
3025 | ||
1f9248e5 JP |
3026 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3027 | (&((struct neigh_parms *) 0)->data[index]) | |
3028 | ||
3029 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3030 | [NEIGH_VAR_ ## attr] = { \ | |
3031 | .procname = name, \ | |
3032 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3033 | .maxlen = sizeof(int), \ | |
3034 | .mode = mval, \ | |
3035 | .proc_handler = proc, \ | |
3036 | } | |
3037 | ||
3038 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3039 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3040 | ||
3041 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3042 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3043 | |
3044 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3045 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 JP |
3046 | |
3047 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3048 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3049 | |
3050 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3051 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3052 | |
3053 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3054 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3055 | |
1da177e4 LT |
3056 | static struct neigh_sysctl_table { |
3057 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3058 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3059 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3060 | .neigh_vars = { |
1f9248e5 JP |
3061 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3062 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3063 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3064 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3065 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3066 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3067 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3068 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3069 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3070 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3071 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3072 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3073 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3074 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3075 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3076 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3077 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3078 | .procname = "gc_interval", |
3079 | .maxlen = sizeof(int), | |
3080 | .mode = 0644, | |
6d9f239a | 3081 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3082 | }, |
8b5c171b | 3083 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3084 | .procname = "gc_thresh1", |
3085 | .maxlen = sizeof(int), | |
3086 | .mode = 0644, | |
555445cd FF |
3087 | .extra1 = &zero, |
3088 | .extra2 = &int_max, | |
3089 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3090 | }, |
8b5c171b | 3091 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3092 | .procname = "gc_thresh2", |
3093 | .maxlen = sizeof(int), | |
3094 | .mode = 0644, | |
555445cd FF |
3095 | .extra1 = &zero, |
3096 | .extra2 = &int_max, | |
3097 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3098 | }, |
8b5c171b | 3099 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3100 | .procname = "gc_thresh3", |
3101 | .maxlen = sizeof(int), | |
3102 | .mode = 0644, | |
555445cd FF |
3103 | .extra1 = &zero, |
3104 | .extra2 = &int_max, | |
3105 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3106 | }, |
c3bac5a7 | 3107 | {}, |
1da177e4 LT |
3108 | }, |
3109 | }; | |
3110 | ||
3111 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3112 | proc_handler *handler) |
1da177e4 | 3113 | { |
1f9248e5 | 3114 | int i; |
3c607bbb | 3115 | struct neigh_sysctl_table *t; |
1f9248e5 | 3116 | const char *dev_name_source; |
8f40a1f9 | 3117 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3118 | char *p_name; |
1da177e4 | 3119 | |
3c607bbb | 3120 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3121 | if (!t) |
3c607bbb PE |
3122 | goto err; |
3123 | ||
b194c1f1 | 3124 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3125 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3126 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3127 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3128 | } |
1da177e4 LT |
3129 | |
3130 | if (dev) { | |
3131 | dev_name_source = dev->name; | |
d12af679 | 3132 | /* Terminate the table early */ |
8b5c171b ED |
3133 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3134 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3135 | } else { |
9ecf07a1 | 3136 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3137 | dev_name_source = "default"; |
9ecf07a1 MK |
3138 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3139 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3140 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3141 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3142 | } |
3143 | ||
f8572d8f | 3144 | if (handler) { |
1da177e4 | 3145 | /* RetransTime */ |
8b5c171b | 3146 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3147 | /* ReachableTime */ |
8b5c171b | 3148 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3149 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3150 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3151 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3152 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3153 | } else { |
3154 | /* Those handlers will update p->reachable_time after | |
3155 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3156 | * applied after the next neighbour update instead of waiting for | |
3157 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3158 | * So any handler that replaces them should do this as well | |
3159 | */ | |
3160 | /* ReachableTime */ | |
3161 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3162 | neigh_proc_base_reachable_time; | |
3163 | /* ReachableTime (in milliseconds) */ | |
3164 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3165 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3166 | } |
3167 | ||
464dc801 EB |
3168 | /* Don't export sysctls to unprivileged users */ |
3169 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3170 | t->neigh_vars[0].procname = NULL; | |
3171 | ||
73af614a JP |
3172 | switch (neigh_parms_family(p)) { |
3173 | case AF_INET: | |
3174 | p_name = "ipv4"; | |
3175 | break; | |
3176 | case AF_INET6: | |
3177 | p_name = "ipv6"; | |
3178 | break; | |
3179 | default: | |
3180 | BUG(); | |
3181 | } | |
3182 | ||
8f40a1f9 EB |
3183 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3184 | p_name, dev_name_source); | |
4ab438fc | 3185 | t->sysctl_header = |
8f40a1f9 | 3186 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3187 | if (!t->sysctl_header) |
8f40a1f9 | 3188 | goto free; |
3c607bbb | 3189 | |
1da177e4 LT |
3190 | p->sysctl_table = t; |
3191 | return 0; | |
3192 | ||
3c607bbb | 3193 | free: |
1da177e4 | 3194 | kfree(t); |
3c607bbb PE |
3195 | err: |
3196 | return -ENOBUFS; | |
1da177e4 | 3197 | } |
0a204500 | 3198 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3199 | |
3200 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3201 | { | |
3202 | if (p->sysctl_table) { | |
3203 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3204 | p->sysctl_table = NULL; | |
5dd3df10 | 3205 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3206 | kfree(t); |
3207 | } | |
3208 | } | |
0a204500 | 3209 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3210 | |
3211 | #endif /* CONFIG_SYSCTL */ | |
3212 | ||
c8822a4e TG |
3213 | static int __init neigh_init(void) |
3214 | { | |
c7ac8679 GR |
3215 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
3216 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); | |
3217 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); | |
c8822a4e | 3218 | |
c7ac8679 GR |
3219 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
3220 | NULL); | |
3221 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); | |
c8822a4e TG |
3222 | |
3223 | return 0; | |
3224 | } | |
3225 | ||
3226 | subsys_initcall(neigh_init); | |
3227 |