]>
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); |
53f800e3 | 103 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
4f494554 TG |
104 | neigh_release(neigh); |
105 | } | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
109 | * It corresponds to default IPv6 settings and is not overridable, | |
110 | * because it is really reasonable choice. | |
111 | */ | |
112 | ||
113 | unsigned long neigh_rand_reach_time(unsigned long base) | |
114 | { | |
63862b5b | 115 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 116 | } |
0a204500 | 117 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 LT |
118 | |
119 | ||
120 | static int neigh_forced_gc(struct neigh_table *tbl) | |
121 | { | |
122 | int shrunk = 0; | |
123 | int i; | |
d6bf7817 | 124 | struct neigh_hash_table *nht; |
1da177e4 LT |
125 | |
126 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
127 | ||
128 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
129 | nht = rcu_dereference_protected(tbl->nht, |
130 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 131 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
132 | struct neighbour *n; |
133 | struct neighbour __rcu **np; | |
1da177e4 | 134 | |
d6bf7817 | 135 | np = &nht->hash_buckets[i]; |
767e97e1 ED |
136 | while ((n = rcu_dereference_protected(*np, |
137 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
138 | /* Neighbour record may be discarded if: |
139 | * - nobody refers to it. | |
140 | * - it is not permanent | |
141 | */ | |
142 | write_lock(&n->lock); | |
143 | if (atomic_read(&n->refcnt) == 1 && | |
144 | !(n->nud_state & NUD_PERMANENT)) { | |
767e97e1 ED |
145 | rcu_assign_pointer(*np, |
146 | rcu_dereference_protected(n->next, | |
147 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
148 | n->dead = 1; |
149 | shrunk = 1; | |
150 | write_unlock(&n->lock); | |
4f494554 | 151 | neigh_cleanup_and_release(n); |
1da177e4 LT |
152 | continue; |
153 | } | |
154 | write_unlock(&n->lock); | |
155 | np = &n->next; | |
156 | } | |
157 | } | |
158 | ||
159 | tbl->last_flush = jiffies; | |
160 | ||
161 | write_unlock_bh(&tbl->lock); | |
162 | ||
163 | return shrunk; | |
164 | } | |
165 | ||
a43d8994 PE |
166 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
167 | { | |
168 | neigh_hold(n); | |
169 | if (unlikely(mod_timer(&n->timer, when))) { | |
170 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
171 | n->nud_state); | |
172 | dump_stack(); | |
173 | } | |
174 | } | |
175 | ||
1da177e4 LT |
176 | static int neigh_del_timer(struct neighbour *n) |
177 | { | |
178 | if ((n->nud_state & NUD_IN_TIMER) && | |
179 | del_timer(&n->timer)) { | |
180 | neigh_release(n); | |
181 | return 1; | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
187 | { | |
188 | struct sk_buff *skb; | |
189 | ||
190 | while ((skb = skb_dequeue(list)) != NULL) { | |
191 | dev_put(skb->dev); | |
192 | kfree_skb(skb); | |
193 | } | |
194 | } | |
195 | ||
49636bb1 | 196 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
197 | { |
198 | int i; | |
d6bf7817 | 199 | struct neigh_hash_table *nht; |
1da177e4 | 200 | |
d6bf7817 ED |
201 | nht = rcu_dereference_protected(tbl->nht, |
202 | lockdep_is_held(&tbl->lock)); | |
203 | ||
cd089336 | 204 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
205 | struct neighbour *n; |
206 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 207 | |
767e97e1 ED |
208 | while ((n = rcu_dereference_protected(*np, |
209 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
210 | if (dev && n->dev != dev) { |
211 | np = &n->next; | |
212 | continue; | |
213 | } | |
767e97e1 ED |
214 | rcu_assign_pointer(*np, |
215 | rcu_dereference_protected(n->next, | |
216 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
217 | write_lock(&n->lock); |
218 | neigh_del_timer(n); | |
219 | n->dead = 1; | |
220 | ||
221 | if (atomic_read(&n->refcnt) != 1) { | |
222 | /* The most unpleasant situation. | |
223 | We must destroy neighbour entry, | |
224 | but someone still uses it. | |
225 | ||
226 | The destroy will be delayed until | |
227 | the last user releases us, but | |
228 | we must kill timers etc. and move | |
229 | it to safe state. | |
230 | */ | |
c9ab4d85 | 231 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 232 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
233 | n->output = neigh_blackhole; |
234 | if (n->nud_state & NUD_VALID) | |
235 | n->nud_state = NUD_NOARP; | |
236 | else | |
237 | n->nud_state = NUD_NONE; | |
d5d427cd | 238 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
239 | } |
240 | write_unlock(&n->lock); | |
4f494554 | 241 | neigh_cleanup_and_release(n); |
1da177e4 LT |
242 | } |
243 | } | |
49636bb1 | 244 | } |
1da177e4 | 245 | |
49636bb1 HX |
246 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
247 | { | |
248 | write_lock_bh(&tbl->lock); | |
249 | neigh_flush_dev(tbl, dev); | |
250 | write_unlock_bh(&tbl->lock); | |
251 | } | |
0a204500 | 252 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
253 | |
254 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
255 | { | |
256 | write_lock_bh(&tbl->lock); | |
257 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
258 | pneigh_ifdown(tbl, dev); |
259 | write_unlock_bh(&tbl->lock); | |
260 | ||
261 | del_timer_sync(&tbl->proxy_timer); | |
262 | pneigh_queue_purge(&tbl->proxy_queue); | |
263 | return 0; | |
264 | } | |
0a204500 | 265 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 266 | |
596b9b68 | 267 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
268 | { |
269 | struct neighbour *n = NULL; | |
270 | unsigned long now = jiffies; | |
271 | int entries; | |
272 | ||
273 | entries = atomic_inc_return(&tbl->entries) - 1; | |
274 | if (entries >= tbl->gc_thresh3 || | |
275 | (entries >= tbl->gc_thresh2 && | |
276 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
277 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
278 | entries >= tbl->gc_thresh3) { |
279 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
280 | tbl->id); | |
281 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 282 | goto out_entries; |
fb811395 | 283 | } |
1da177e4 LT |
284 | } |
285 | ||
08433eff | 286 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
287 | if (!n) |
288 | goto out_entries; | |
289 | ||
c9ab4d85 | 290 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 291 | rwlock_init(&n->lock); |
0ed8ddf4 | 292 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
293 | n->updated = n->used = now; |
294 | n->nud_state = NUD_NONE; | |
295 | n->output = neigh_blackhole; | |
f6b72b62 | 296 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 297 | n->parms = neigh_parms_clone(&tbl->parms); |
b24b8a24 | 298 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
299 | |
300 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
301 | n->tbl = tbl; | |
302 | atomic_set(&n->refcnt, 1); | |
303 | n->dead = 1; | |
304 | out: | |
305 | return n; | |
306 | ||
307 | out_entries: | |
308 | atomic_dec(&tbl->entries); | |
309 | goto out; | |
310 | } | |
311 | ||
2c2aba6c DM |
312 | static void neigh_get_hash_rnd(u32 *x) |
313 | { | |
314 | get_random_bytes(x, sizeof(*x)); | |
315 | *x |= 1; | |
316 | } | |
317 | ||
cd089336 | 318 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 319 | { |
cd089336 | 320 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 321 | struct neigh_hash_table *ret; |
6193d2be | 322 | struct neighbour __rcu **buckets; |
2c2aba6c | 323 | int i; |
1da177e4 | 324 | |
d6bf7817 ED |
325 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
326 | if (!ret) | |
327 | return NULL; | |
328 | if (size <= PAGE_SIZE) | |
329 | buckets = kzalloc(size, GFP_ATOMIC); | |
330 | else | |
6193d2be | 331 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
332 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
333 | get_order(size)); | |
334 | if (!buckets) { | |
335 | kfree(ret); | |
336 | return NULL; | |
1da177e4 | 337 | } |
6193d2be | 338 | ret->hash_buckets = buckets; |
cd089336 | 339 | ret->hash_shift = shift; |
2c2aba6c DM |
340 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
341 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
342 | return ret; |
343 | } | |
344 | ||
d6bf7817 | 345 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 346 | { |
d6bf7817 ED |
347 | struct neigh_hash_table *nht = container_of(head, |
348 | struct neigh_hash_table, | |
349 | rcu); | |
cd089336 | 350 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 351 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 LT |
352 | |
353 | if (size <= PAGE_SIZE) | |
d6bf7817 | 354 | kfree(buckets); |
1da177e4 | 355 | else |
d6bf7817 ED |
356 | free_pages((unsigned long)buckets, get_order(size)); |
357 | kfree(nht); | |
1da177e4 LT |
358 | } |
359 | ||
d6bf7817 | 360 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 361 | unsigned long new_shift) |
1da177e4 | 362 | { |
d6bf7817 ED |
363 | unsigned int i, hash; |
364 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
365 | |
366 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
367 | ||
d6bf7817 ED |
368 | old_nht = rcu_dereference_protected(tbl->nht, |
369 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 370 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
371 | if (!new_nht) |
372 | return old_nht; | |
1da177e4 | 373 | |
cd089336 | 374 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
375 | struct neighbour *n, *next; |
376 | ||
767e97e1 ED |
377 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
378 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
379 | n != NULL; |
380 | n = next) { | |
381 | hash = tbl->hash(n->primary_key, n->dev, | |
382 | new_nht->hash_rnd); | |
1da177e4 | 383 | |
cd089336 | 384 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
385 | next = rcu_dereference_protected(n->next, |
386 | lockdep_is_held(&tbl->lock)); | |
387 | ||
388 | rcu_assign_pointer(n->next, | |
389 | rcu_dereference_protected( | |
390 | new_nht->hash_buckets[hash], | |
391 | lockdep_is_held(&tbl->lock))); | |
392 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
393 | } |
394 | } | |
1da177e4 | 395 | |
d6bf7817 ED |
396 | rcu_assign_pointer(tbl->nht, new_nht); |
397 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
398 | return new_nht; | |
1da177e4 LT |
399 | } |
400 | ||
401 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
402 | struct net_device *dev) | |
403 | { | |
404 | struct neighbour *n; | |
4ec93edb | 405 | |
1da177e4 LT |
406 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
407 | ||
d6bf7817 | 408 | rcu_read_lock_bh(); |
60395a20 EB |
409 | n = __neigh_lookup_noref(tbl, pkey, dev); |
410 | if (n) { | |
411 | if (!atomic_inc_not_zero(&n->refcnt)) | |
412 | n = NULL; | |
413 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 414 | } |
767e97e1 | 415 | |
d6bf7817 | 416 | rcu_read_unlock_bh(); |
1da177e4 LT |
417 | return n; |
418 | } | |
0a204500 | 419 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 420 | |
426b5303 EB |
421 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
422 | const void *pkey) | |
1da177e4 LT |
423 | { |
424 | struct neighbour *n; | |
425 | int key_len = tbl->key_len; | |
bc4bf5f3 | 426 | u32 hash_val; |
d6bf7817 | 427 | struct neigh_hash_table *nht; |
1da177e4 LT |
428 | |
429 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
430 | ||
d6bf7817 ED |
431 | rcu_read_lock_bh(); |
432 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 433 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
434 | |
435 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
436 | n != NULL; | |
437 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 438 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 439 | net_eq(dev_net(n->dev), net)) { |
767e97e1 ED |
440 | if (!atomic_inc_not_zero(&n->refcnt)) |
441 | n = NULL; | |
1da177e4 LT |
442 | NEIGH_CACHE_STAT_INC(tbl, hits); |
443 | break; | |
444 | } | |
445 | } | |
767e97e1 | 446 | |
d6bf7817 | 447 | rcu_read_unlock_bh(); |
1da177e4 LT |
448 | return n; |
449 | } | |
0a204500 | 450 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 451 | |
a263b309 DM |
452 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
453 | struct net_device *dev, bool want_ref) | |
1da177e4 LT |
454 | { |
455 | u32 hash_val; | |
456 | int key_len = tbl->key_len; | |
457 | int error; | |
596b9b68 | 458 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
d6bf7817 | 459 | struct neigh_hash_table *nht; |
1da177e4 LT |
460 | |
461 | if (!n) { | |
462 | rc = ERR_PTR(-ENOBUFS); | |
463 | goto out; | |
464 | } | |
465 | ||
466 | memcpy(n->primary_key, pkey, key_len); | |
467 | n->dev = dev; | |
468 | dev_hold(dev); | |
469 | ||
470 | /* Protocol specific setup. */ | |
471 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
472 | rc = ERR_PTR(error); | |
473 | goto out_neigh_release; | |
474 | } | |
475 | ||
da6a8fa0 | 476 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 477 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
478 | if (error < 0) { |
479 | rc = ERR_PTR(error); | |
480 | goto out_neigh_release; | |
481 | } | |
482 | } | |
483 | ||
447f2191 DM |
484 | /* Device specific setup. */ |
485 | if (n->parms->neigh_setup && | |
486 | (error = n->parms->neigh_setup(n)) < 0) { | |
487 | rc = ERR_PTR(error); | |
488 | goto out_neigh_release; | |
489 | } | |
490 | ||
1f9248e5 | 491 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
492 | |
493 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
494 | nht = rcu_dereference_protected(tbl->nht, |
495 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 496 | |
cd089336 DM |
497 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
498 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 499 | |
cd089336 | 500 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
501 | |
502 | if (n->parms->dead) { | |
503 | rc = ERR_PTR(-EINVAL); | |
504 | goto out_tbl_unlock; | |
505 | } | |
506 | ||
767e97e1 ED |
507 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
508 | lockdep_is_held(&tbl->lock)); | |
509 | n1 != NULL; | |
510 | n1 = rcu_dereference_protected(n1->next, | |
511 | lockdep_is_held(&tbl->lock))) { | |
1da177e4 | 512 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
a263b309 DM |
513 | if (want_ref) |
514 | neigh_hold(n1); | |
1da177e4 LT |
515 | rc = n1; |
516 | goto out_tbl_unlock; | |
517 | } | |
518 | } | |
519 | ||
1da177e4 | 520 | n->dead = 0; |
a263b309 DM |
521 | if (want_ref) |
522 | neigh_hold(n); | |
767e97e1 ED |
523 | rcu_assign_pointer(n->next, |
524 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
525 | lockdep_is_held(&tbl->lock))); | |
526 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 527 | write_unlock_bh(&tbl->lock); |
d5d427cd | 528 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
529 | rc = n; |
530 | out: | |
531 | return rc; | |
532 | out_tbl_unlock: | |
533 | write_unlock_bh(&tbl->lock); | |
534 | out_neigh_release: | |
535 | neigh_release(n); | |
536 | goto out; | |
537 | } | |
a263b309 | 538 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 539 | |
be01d655 | 540 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 541 | { |
fa86d322 | 542 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
543 | hash_val ^= (hash_val >> 16); |
544 | hash_val ^= hash_val >> 8; | |
545 | hash_val ^= hash_val >> 4; | |
546 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
547 | return hash_val; |
548 | } | |
fa86d322 | 549 | |
be01d655 YH |
550 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
551 | struct net *net, | |
552 | const void *pkey, | |
553 | int key_len, | |
554 | struct net_device *dev) | |
555 | { | |
556 | while (n) { | |
fa86d322 | 557 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 558 | net_eq(pneigh_net(n), net) && |
fa86d322 | 559 | (n->dev == dev || !n->dev)) |
be01d655 YH |
560 | return n; |
561 | n = n->next; | |
fa86d322 | 562 | } |
be01d655 YH |
563 | return NULL; |
564 | } | |
fa86d322 | 565 | |
be01d655 YH |
566 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
567 | struct net *net, const void *pkey, struct net_device *dev) | |
568 | { | |
569 | int key_len = tbl->key_len; | |
570 | u32 hash_val = pneigh_hash(pkey, key_len); | |
571 | ||
572 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
573 | net, pkey, key_len, dev); | |
fa86d322 | 574 | } |
0a204500 | 575 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 576 | |
426b5303 EB |
577 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
578 | struct net *net, const void *pkey, | |
1da177e4 LT |
579 | struct net_device *dev, int creat) |
580 | { | |
581 | struct pneigh_entry *n; | |
582 | int key_len = tbl->key_len; | |
be01d655 | 583 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
584 | |
585 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
586 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
587 | net, pkey, key_len, dev); | |
1da177e4 | 588 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
589 | |
590 | if (n || !creat) | |
1da177e4 LT |
591 | goto out; |
592 | ||
4ae28944 PE |
593 | ASSERT_RTNL(); |
594 | ||
1da177e4 LT |
595 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
596 | if (!n) | |
597 | goto out; | |
598 | ||
efd7ef1c | 599 | write_pnet(&n->net, net); |
1da177e4 LT |
600 | memcpy(n->key, pkey, key_len); |
601 | n->dev = dev; | |
602 | if (dev) | |
603 | dev_hold(dev); | |
604 | ||
605 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
606 | if (dev) | |
607 | dev_put(dev); | |
608 | kfree(n); | |
609 | n = NULL; | |
610 | goto out; | |
611 | } | |
612 | ||
613 | write_lock_bh(&tbl->lock); | |
614 | n->next = tbl->phash_buckets[hash_val]; | |
615 | tbl->phash_buckets[hash_val] = n; | |
616 | write_unlock_bh(&tbl->lock); | |
617 | out: | |
618 | return n; | |
619 | } | |
0a204500 | 620 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
621 | |
622 | ||
426b5303 | 623 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
624 | struct net_device *dev) |
625 | { | |
626 | struct pneigh_entry *n, **np; | |
627 | int key_len = tbl->key_len; | |
be01d655 | 628 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
629 | |
630 | write_lock_bh(&tbl->lock); | |
631 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
632 | np = &n->next) { | |
426b5303 | 633 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 634 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
635 | *np = n->next; |
636 | write_unlock_bh(&tbl->lock); | |
637 | if (tbl->pdestructor) | |
638 | tbl->pdestructor(n); | |
639 | if (n->dev) | |
640 | dev_put(n->dev); | |
641 | kfree(n); | |
642 | return 0; | |
643 | } | |
644 | } | |
645 | write_unlock_bh(&tbl->lock); | |
646 | return -ENOENT; | |
647 | } | |
648 | ||
649 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
650 | { | |
651 | struct pneigh_entry *n, **np; | |
652 | u32 h; | |
653 | ||
654 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
655 | np = &tbl->phash_buckets[h]; | |
656 | while ((n = *np) != NULL) { | |
657 | if (!dev || n->dev == dev) { | |
658 | *np = n->next; | |
659 | if (tbl->pdestructor) | |
660 | tbl->pdestructor(n); | |
661 | if (n->dev) | |
662 | dev_put(n->dev); | |
663 | kfree(n); | |
664 | continue; | |
665 | } | |
666 | np = &n->next; | |
667 | } | |
668 | } | |
669 | return -ENOENT; | |
670 | } | |
671 | ||
06f0511d DL |
672 | static void neigh_parms_destroy(struct neigh_parms *parms); |
673 | ||
674 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
675 | { | |
676 | if (atomic_dec_and_test(&parms->refcnt)) | |
677 | neigh_parms_destroy(parms); | |
678 | } | |
1da177e4 LT |
679 | |
680 | /* | |
681 | * neighbour must already be out of the table; | |
682 | * | |
683 | */ | |
684 | void neigh_destroy(struct neighbour *neigh) | |
685 | { | |
da6a8fa0 DM |
686 | struct net_device *dev = neigh->dev; |
687 | ||
1da177e4 LT |
688 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
689 | ||
690 | if (!neigh->dead) { | |
e005d193 | 691 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
692 | dump_stack(); |
693 | return; | |
694 | } | |
695 | ||
696 | if (neigh_del_timer(neigh)) | |
e005d193 | 697 | pr_warn("Impossible event\n"); |
1da177e4 | 698 | |
c9ab4d85 ED |
699 | write_lock_bh(&neigh->lock); |
700 | __skb_queue_purge(&neigh->arp_queue); | |
701 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 702 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 703 | |
447f2191 | 704 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 705 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 706 | |
da6a8fa0 | 707 | dev_put(dev); |
1da177e4 LT |
708 | neigh_parms_put(neigh->parms); |
709 | ||
d5d427cd | 710 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
711 | |
712 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 713 | kfree_rcu(neigh, rcu); |
1da177e4 | 714 | } |
0a204500 | 715 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
716 | |
717 | /* Neighbour state is suspicious; | |
718 | disable fast path. | |
719 | ||
720 | Called with write_locked neigh. | |
721 | */ | |
722 | static void neigh_suspect(struct neighbour *neigh) | |
723 | { | |
d5d427cd | 724 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
725 | |
726 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
727 | } |
728 | ||
729 | /* Neighbour state is OK; | |
730 | enable fast path. | |
731 | ||
732 | Called with write_locked neigh. | |
733 | */ | |
734 | static void neigh_connect(struct neighbour *neigh) | |
735 | { | |
d5d427cd | 736 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
737 | |
738 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
739 | } |
740 | ||
e4c4e448 | 741 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 742 | { |
e4c4e448 | 743 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
744 | struct neighbour *n; |
745 | struct neighbour __rcu **np; | |
e4c4e448 | 746 | unsigned int i; |
d6bf7817 | 747 | struct neigh_hash_table *nht; |
1da177e4 LT |
748 | |
749 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
750 | ||
e4c4e448 | 751 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
752 | nht = rcu_dereference_protected(tbl->nht, |
753 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
754 | |
755 | /* | |
756 | * periodically recompute ReachableTime from random function | |
757 | */ | |
758 | ||
e4c4e448 | 759 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 760 | struct neigh_parms *p; |
e4c4e448 | 761 | tbl->last_rand = jiffies; |
75fbfd33 | 762 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 763 | p->reachable_time = |
1f9248e5 | 764 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
765 | } |
766 | ||
feff9ab2 DJ |
767 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
768 | goto out; | |
769 | ||
cd089336 | 770 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 771 | np = &nht->hash_buckets[i]; |
1da177e4 | 772 | |
767e97e1 ED |
773 | while ((n = rcu_dereference_protected(*np, |
774 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 775 | unsigned int state; |
1da177e4 | 776 | |
e4c4e448 | 777 | write_lock(&n->lock); |
1da177e4 | 778 | |
e4c4e448 ED |
779 | state = n->nud_state; |
780 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
781 | write_unlock(&n->lock); | |
782 | goto next_elt; | |
783 | } | |
1da177e4 | 784 | |
e4c4e448 ED |
785 | if (time_before(n->used, n->confirmed)) |
786 | n->used = n->confirmed; | |
1da177e4 | 787 | |
e4c4e448 ED |
788 | if (atomic_read(&n->refcnt) == 1 && |
789 | (state == NUD_FAILED || | |
1f9248e5 | 790 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 ED |
791 | *np = n->next; |
792 | n->dead = 1; | |
793 | write_unlock(&n->lock); | |
794 | neigh_cleanup_and_release(n); | |
795 | continue; | |
796 | } | |
1da177e4 | 797 | write_unlock(&n->lock); |
1da177e4 LT |
798 | |
799 | next_elt: | |
e4c4e448 ED |
800 | np = &n->next; |
801 | } | |
802 | /* | |
803 | * It's fine to release lock here, even if hash table | |
804 | * grows while we are preempted. | |
805 | */ | |
806 | write_unlock_bh(&tbl->lock); | |
807 | cond_resched(); | |
808 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
809 | nht = rcu_dereference_protected(tbl->nht, |
810 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 811 | } |
2724680b | 812 | out: |
1f9248e5 JP |
813 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
814 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
815 | * BASE_REACHABLE_TIME. | |
1da177e4 | 816 | */ |
f618002b | 817 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 818 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 819 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
820 | } |
821 | ||
822 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
823 | { | |
824 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
825 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
826 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
827 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
828 | } |
829 | ||
5ef12d98 | 830 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
831 | __releases(neigh->lock) |
832 | __acquires(neigh->lock) | |
5ef12d98 TT |
833 | { |
834 | struct sk_buff *skb; | |
835 | ||
836 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 837 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
838 | neigh->updated = jiffies; |
839 | ||
840 | /* It is very thin place. report_unreachable is very complicated | |
841 | routine. Particularly, it can hit the same neighbour entry! | |
842 | ||
843 | So that, we try to be accurate and avoid dead loop. --ANK | |
844 | */ | |
845 | while (neigh->nud_state == NUD_FAILED && | |
846 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
847 | write_unlock(&neigh->lock); | |
848 | neigh->ops->error_report(neigh, skb); | |
849 | write_lock(&neigh->lock); | |
850 | } | |
c9ab4d85 | 851 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 852 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
853 | } |
854 | ||
cd28ca0a ED |
855 | static void neigh_probe(struct neighbour *neigh) |
856 | __releases(neigh->lock) | |
857 | { | |
4ed377e3 | 858 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
859 | /* keep skb alive even if arp_queue overflows */ |
860 | if (skb) | |
19125c1a | 861 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a ED |
862 | write_unlock(&neigh->lock); |
863 | neigh->ops->solicit(neigh, skb); | |
864 | atomic_inc(&neigh->probes); | |
865 | kfree_skb(skb); | |
866 | } | |
867 | ||
1da177e4 LT |
868 | /* Called when a timer expires for a neighbour entry. */ |
869 | ||
870 | static void neigh_timer_handler(unsigned long arg) | |
871 | { | |
872 | unsigned long now, next; | |
873 | struct neighbour *neigh = (struct neighbour *)arg; | |
95c96174 | 874 | unsigned int state; |
1da177e4 LT |
875 | int notify = 0; |
876 | ||
877 | write_lock(&neigh->lock); | |
878 | ||
879 | state = neigh->nud_state; | |
880 | now = jiffies; | |
881 | next = now + HZ; | |
882 | ||
045f7b3b | 883 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 884 | goto out; |
1da177e4 LT |
885 | |
886 | if (state & NUD_REACHABLE) { | |
4ec93edb | 887 | if (time_before_eq(now, |
1da177e4 | 888 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 889 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
890 | next = neigh->confirmed + neigh->parms->reachable_time; |
891 | } else if (time_before_eq(now, | |
1f9248e5 JP |
892 | neigh->used + |
893 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 894 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 895 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 896 | neigh->updated = jiffies; |
1da177e4 | 897 | neigh_suspect(neigh); |
1f9248e5 | 898 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 899 | } else { |
d5d427cd | 900 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 901 | neigh->nud_state = NUD_STALE; |
955aaa2f | 902 | neigh->updated = jiffies; |
1da177e4 | 903 | neigh_suspect(neigh); |
8d71740c | 904 | notify = 1; |
1da177e4 LT |
905 | } |
906 | } else if (state & NUD_DELAY) { | |
4ec93edb | 907 | if (time_before_eq(now, |
1f9248e5 JP |
908 | neigh->confirmed + |
909 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 910 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 911 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 912 | neigh->updated = jiffies; |
1da177e4 | 913 | neigh_connect(neigh); |
8d71740c | 914 | notify = 1; |
1da177e4 LT |
915 | next = neigh->confirmed + neigh->parms->reachable_time; |
916 | } else { | |
d5d427cd | 917 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 918 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 919 | neigh->updated = jiffies; |
1da177e4 | 920 | atomic_set(&neigh->probes, 0); |
765c9c63 | 921 | notify = 1; |
1f9248e5 | 922 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
923 | } |
924 | } else { | |
925 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
1f9248e5 | 926 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
927 | } |
928 | ||
929 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
930 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
931 | neigh->nud_state = NUD_FAILED; |
932 | notify = 1; | |
5ef12d98 | 933 | neigh_invalidate(neigh); |
5e2c21dc | 934 | goto out; |
1da177e4 LT |
935 | } |
936 | ||
937 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
938 | if (time_before(next, jiffies + HZ/2)) |
939 | next = jiffies + HZ/2; | |
6fb9974f HX |
940 | if (!mod_timer(&neigh->timer, next)) |
941 | neigh_hold(neigh); | |
1da177e4 LT |
942 | } |
943 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 944 | neigh_probe(neigh); |
9ff56607 | 945 | } else { |
69cc64d8 | 946 | out: |
9ff56607 DM |
947 | write_unlock(&neigh->lock); |
948 | } | |
d961db35 | 949 | |
8d71740c | 950 | if (notify) |
d961db35 | 951 | neigh_update_notify(neigh); |
1da177e4 | 952 | |
1da177e4 LT |
953 | neigh_release(neigh); |
954 | } | |
955 | ||
956 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
957 | { | |
958 | int rc; | |
cd28ca0a | 959 | bool immediate_probe = false; |
1da177e4 LT |
960 | |
961 | write_lock_bh(&neigh->lock); | |
962 | ||
963 | rc = 0; | |
964 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
965 | goto out_unlock_bh; | |
2c51a97f JA |
966 | if (neigh->dead) |
967 | goto out_dead; | |
1da177e4 | 968 | |
1da177e4 | 969 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
970 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
971 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
972 | unsigned long next, now = jiffies; |
973 | ||
1f9248e5 JP |
974 | atomic_set(&neigh->probes, |
975 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
1da177e4 | 976 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 977 | neigh->updated = now; |
1f9248e5 JP |
978 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
979 | HZ/2); | |
cd28ca0a ED |
980 | neigh_add_timer(neigh, next); |
981 | immediate_probe = true; | |
1da177e4 LT |
982 | } else { |
983 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 984 | neigh->updated = jiffies; |
1da177e4 LT |
985 | write_unlock_bh(&neigh->lock); |
986 | ||
f3fbbe0f | 987 | kfree_skb(skb); |
1da177e4 LT |
988 | return 1; |
989 | } | |
990 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 991 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 992 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 993 | neigh->updated = jiffies; |
1f9248e5 JP |
994 | neigh_add_timer(neigh, jiffies + |
995 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
996 | } |
997 | ||
998 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
999 | if (skb) { | |
8b5c171b | 1000 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1001 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1002 | struct sk_buff *buff; |
8b5c171b | 1003 | |
f72051b0 | 1004 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1005 | if (!buff) |
1006 | break; | |
1007 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1008 | kfree_skb(buff); |
9a6d276e | 1009 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1010 | } |
a4731138 | 1011 | skb_dst_force(skb); |
1da177e4 | 1012 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1013 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1014 | } |
1015 | rc = 1; | |
1016 | } | |
1017 | out_unlock_bh: | |
cd28ca0a ED |
1018 | if (immediate_probe) |
1019 | neigh_probe(neigh); | |
1020 | else | |
1021 | write_unlock(&neigh->lock); | |
1022 | local_bh_enable(); | |
1da177e4 | 1023 | return rc; |
2c51a97f JA |
1024 | |
1025 | out_dead: | |
1026 | if (neigh->nud_state & NUD_STALE) | |
1027 | goto out_unlock_bh; | |
1028 | write_unlock_bh(&neigh->lock); | |
1029 | kfree_skb(skb); | |
1030 | return 1; | |
1da177e4 | 1031 | } |
0a204500 | 1032 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1033 | |
f6b72b62 | 1034 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1035 | { |
1036 | struct hh_cache *hh; | |
3b04ddde | 1037 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1038 | = NULL; |
1039 | ||
1040 | if (neigh->dev->header_ops) | |
1041 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1042 | |
1043 | if (update) { | |
f6b72b62 DM |
1044 | hh = &neigh->hh; |
1045 | if (hh->hh_len) { | |
3644f0ce | 1046 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1047 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1048 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1049 | } |
1050 | } | |
1051 | } | |
1052 | ||
1053 | ||
1054 | ||
1055 | /* Generic update routine. | |
1056 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1057 | -- new is new state. | |
1058 | -- flags | |
1059 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1060 | if it is different. | |
1061 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1062 | lladdr instead of overriding it |
1da177e4 | 1063 | if it is different. |
1da177e4 LT |
1064 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
1065 | ||
4ec93edb | 1066 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1067 | NTF_ROUTER flag. |
1068 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1069 | a router. | |
1070 | ||
1071 | Caller MUST hold reference count on the entry. | |
1072 | */ | |
1073 | ||
1074 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1075 | u32 flags) | |
1076 | { | |
1077 | u8 old; | |
1078 | int err; | |
1da177e4 | 1079 | int notify = 0; |
1da177e4 LT |
1080 | struct net_device *dev; |
1081 | int update_isrouter = 0; | |
1082 | ||
1083 | write_lock_bh(&neigh->lock); | |
1084 | ||
1085 | dev = neigh->dev; | |
1086 | old = neigh->nud_state; | |
1087 | err = -EPERM; | |
1088 | ||
4ec93edb | 1089 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1090 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1091 | goto out; | |
2c51a97f JA |
1092 | if (neigh->dead) |
1093 | goto out; | |
1da177e4 LT |
1094 | |
1095 | if (!(new & NUD_VALID)) { | |
1096 | neigh_del_timer(neigh); | |
1097 | if (old & NUD_CONNECTED) | |
1098 | neigh_suspect(neigh); | |
1099 | neigh->nud_state = new; | |
1100 | err = 0; | |
1da177e4 | 1101 | notify = old & NUD_VALID; |
5ef12d98 TT |
1102 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
1103 | (new & NUD_FAILED)) { | |
1104 | neigh_invalidate(neigh); | |
1105 | notify = 1; | |
1106 | } | |
1da177e4 LT |
1107 | goto out; |
1108 | } | |
1109 | ||
1110 | /* Compare new lladdr with cached one */ | |
1111 | if (!dev->addr_len) { | |
1112 | /* First case: device needs no address. */ | |
1113 | lladdr = neigh->ha; | |
1114 | } else if (lladdr) { | |
1115 | /* The second case: if something is already cached | |
1116 | and a new address is proposed: | |
1117 | - compare new & old | |
1118 | - if they are different, check override flag | |
1119 | */ | |
4ec93edb | 1120 | if ((old & NUD_VALID) && |
1da177e4 LT |
1121 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1122 | lladdr = neigh->ha; | |
1123 | } else { | |
1124 | /* No address is supplied; if we know something, | |
1125 | use it, otherwise discard the request. | |
1126 | */ | |
1127 | err = -EINVAL; | |
1128 | if (!(old & NUD_VALID)) | |
1129 | goto out; | |
1130 | lladdr = neigh->ha; | |
1131 | } | |
1132 | ||
1133 | if (new & NUD_CONNECTED) | |
1134 | neigh->confirmed = jiffies; | |
1135 | neigh->updated = jiffies; | |
1136 | ||
1137 | /* If entry was valid and address is not changed, | |
1138 | do not change entry state, if new one is STALE. | |
1139 | */ | |
1140 | err = 0; | |
1141 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1142 | if (old & NUD_VALID) { | |
1143 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1144 | update_isrouter = 0; | |
1145 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1146 | (old & NUD_CONNECTED)) { | |
1147 | lladdr = neigh->ha; | |
1148 | new = NUD_STALE; | |
1149 | } else | |
1150 | goto out; | |
1151 | } else { | |
0e7bbcc1 JA |
1152 | if (lladdr == neigh->ha && new == NUD_STALE && |
1153 | !(flags & NEIGH_UPDATE_F_ADMIN)) | |
1da177e4 LT |
1154 | new = old; |
1155 | } | |
1156 | } | |
1157 | ||
1158 | if (new != old) { | |
1159 | neigh_del_timer(neigh); | |
765c9c63 EK |
1160 | if (new & NUD_PROBE) |
1161 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1162 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1163 | neigh_add_timer(neigh, (jiffies + |
1164 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1165 | neigh->parms->reachable_time : |
1166 | 0))); | |
1da177e4 | 1167 | neigh->nud_state = new; |
53385d2d | 1168 | notify = 1; |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1172 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1173 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1174 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1175 | neigh_update_hhs(neigh); |
1176 | if (!(new & NUD_CONNECTED)) | |
1177 | neigh->confirmed = jiffies - | |
1f9248e5 | 1178 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1179 | notify = 1; |
1da177e4 LT |
1180 | } |
1181 | if (new == old) | |
1182 | goto out; | |
1183 | if (new & NUD_CONNECTED) | |
1184 | neigh_connect(neigh); | |
1185 | else | |
1186 | neigh_suspect(neigh); | |
1187 | if (!(old & NUD_VALID)) { | |
1188 | struct sk_buff *skb; | |
1189 | ||
1190 | /* Again: avoid dead loop if something went wrong */ | |
1191 | ||
1192 | while (neigh->nud_state & NUD_VALID && | |
1193 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1194 | struct dst_entry *dst = skb_dst(skb); |
1195 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1196 | write_unlock_bh(&neigh->lock); |
e049f288 | 1197 | |
1198 | rcu_read_lock(); | |
13a43d94 DM |
1199 | |
1200 | /* Why not just use 'neigh' as-is? The problem is that | |
1201 | * things such as shaper, eql, and sch_teql can end up | |
1202 | * using alternative, different, neigh objects to output | |
1203 | * the packet in the output path. So what we need to do | |
1204 | * here is re-lookup the top-level neigh in the path so | |
1205 | * we can reinject the packet there. | |
1206 | */ | |
1207 | n2 = NULL; | |
1208 | if (dst) { | |
1209 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1210 | if (n2) | |
1211 | n1 = n2; | |
1212 | } | |
8f40b161 | 1213 | n1->output(n1, skb); |
13a43d94 DM |
1214 | if (n2) |
1215 | neigh_release(n2); | |
e049f288 | 1216 | rcu_read_unlock(); |
1217 | ||
1da177e4 LT |
1218 | write_lock_bh(&neigh->lock); |
1219 | } | |
c9ab4d85 | 1220 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1221 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1222 | } |
1223 | out: | |
1224 | if (update_isrouter) { | |
1225 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1226 | (neigh->flags | NTF_ROUTER) : | |
1227 | (neigh->flags & ~NTF_ROUTER); | |
1228 | } | |
1229 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1230 | |
1231 | if (notify) | |
d961db35 TG |
1232 | neigh_update_notify(neigh); |
1233 | ||
1da177e4 LT |
1234 | return err; |
1235 | } | |
0a204500 | 1236 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1237 | |
7e980569 JB |
1238 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1239 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1240 | */ | |
1241 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1242 | { | |
2c51a97f JA |
1243 | if (neigh->dead) |
1244 | return; | |
7e980569 JB |
1245 | neigh->updated = jiffies; |
1246 | if (!(neigh->nud_state & NUD_FAILED)) | |
1247 | return; | |
2176d5d4 DJ |
1248 | neigh->nud_state = NUD_INCOMPLETE; |
1249 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 JB |
1250 | neigh_add_timer(neigh, |
1251 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); | |
1252 | } | |
1253 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1254 | ||
1da177e4 LT |
1255 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1256 | u8 *lladdr, void *saddr, | |
1257 | struct net_device *dev) | |
1258 | { | |
1259 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1260 | lladdr || !dev->addr_len); | |
1261 | if (neigh) | |
4ec93edb | 1262 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1263 | NEIGH_UPDATE_F_OVERRIDE); |
1264 | return neigh; | |
1265 | } | |
0a204500 | 1266 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1267 | |
34d101dd | 1268 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1269 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1270 | { |
bdf53c58 EB |
1271 | struct net_device *dev = n->dev; |
1272 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1273 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1274 | |
1275 | write_lock_bh(&n->lock); | |
34d101dd | 1276 | |
f6b72b62 DM |
1277 | /* Only one thread can come in here and initialize the |
1278 | * hh_cache entry. | |
1279 | */ | |
b23b5455 DM |
1280 | if (!hh->hh_len) |
1281 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1282 | |
0ed8ddf4 | 1283 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1284 | } |
1285 | ||
1da177e4 LT |
1286 | /* Slow and careful. */ |
1287 | ||
8f40b161 | 1288 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1289 | { |
1da177e4 LT |
1290 | int rc = 0; |
1291 | ||
1da177e4 LT |
1292 | if (!neigh_event_send(neigh, skb)) { |
1293 | int err; | |
1294 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1295 | unsigned int seq; |
34d101dd | 1296 | |
f6b72b62 | 1297 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
bdf53c58 | 1298 | neigh_hh_init(neigh); |
34d101dd | 1299 | |
0ed8ddf4 | 1300 | do { |
e1f16503 | 1301 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1302 | seq = read_seqbegin(&neigh->ha_lock); |
1303 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1304 | neigh->ha, NULL, skb->len); | |
1305 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1306 | |
1da177e4 | 1307 | if (err >= 0) |
542d4d68 | 1308 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1309 | else |
1310 | goto out_kfree_skb; | |
1311 | } | |
1312 | out: | |
1313 | return rc; | |
1da177e4 LT |
1314 | out_kfree_skb: |
1315 | rc = -EINVAL; | |
1316 | kfree_skb(skb); | |
1317 | goto out; | |
1318 | } | |
0a204500 | 1319 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1320 | |
1321 | /* As fast as possible without hh cache */ | |
1322 | ||
8f40b161 | 1323 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1324 | { |
1da177e4 | 1325 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1326 | unsigned int seq; |
8f40b161 | 1327 | int err; |
1da177e4 | 1328 | |
0ed8ddf4 | 1329 | do { |
e1f16503 | 1330 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1331 | seq = read_seqbegin(&neigh->ha_lock); |
1332 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1333 | neigh->ha, NULL, skb->len); | |
1334 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1335 | ||
1da177e4 | 1336 | if (err >= 0) |
542d4d68 | 1337 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1338 | else { |
1339 | err = -EINVAL; | |
1340 | kfree_skb(skb); | |
1341 | } | |
1342 | return err; | |
1343 | } | |
0a204500 | 1344 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1345 | |
8f40b161 DM |
1346 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1347 | { | |
1348 | return dev_queue_xmit(skb); | |
1349 | } | |
1350 | EXPORT_SYMBOL(neigh_direct_output); | |
1351 | ||
1da177e4 LT |
1352 | static void neigh_proxy_process(unsigned long arg) |
1353 | { | |
1354 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1355 | long sched_next = 0; | |
1356 | unsigned long now = jiffies; | |
f72051b0 | 1357 | struct sk_buff *skb, *n; |
1da177e4 LT |
1358 | |
1359 | spin_lock(&tbl->proxy_queue.lock); | |
1360 | ||
f72051b0 DM |
1361 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1362 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1363 | |
1da177e4 | 1364 | if (tdif <= 0) { |
f72051b0 | 1365 | struct net_device *dev = skb->dev; |
20e6074e | 1366 | |
f72051b0 | 1367 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1368 | if (tbl->proxy_redo && netif_running(dev)) { |
1369 | rcu_read_lock(); | |
f72051b0 | 1370 | tbl->proxy_redo(skb); |
20e6074e ED |
1371 | rcu_read_unlock(); |
1372 | } else { | |
f72051b0 | 1373 | kfree_skb(skb); |
20e6074e | 1374 | } |
1da177e4 LT |
1375 | |
1376 | dev_put(dev); | |
1377 | } else if (!sched_next || tdif < sched_next) | |
1378 | sched_next = tdif; | |
1379 | } | |
1380 | del_timer(&tbl->proxy_timer); | |
1381 | if (sched_next) | |
1382 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1383 | spin_unlock(&tbl->proxy_queue.lock); | |
1384 | } | |
1385 | ||
1386 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1387 | struct sk_buff *skb) | |
1388 | { | |
1389 | unsigned long now = jiffies; | |
63862b5b AH |
1390 | |
1391 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1392 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1393 | |
1f9248e5 | 1394 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1395 | kfree_skb(skb); |
1396 | return; | |
1397 | } | |
a61bbcf2 PM |
1398 | |
1399 | NEIGH_CB(skb)->sched_next = sched_next; | |
1400 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1401 | |
1402 | spin_lock(&tbl->proxy_queue.lock); | |
1403 | if (del_timer(&tbl->proxy_timer)) { | |
1404 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1405 | sched_next = tbl->proxy_timer.expires; | |
1406 | } | |
adf30907 | 1407 | skb_dst_drop(skb); |
1da177e4 LT |
1408 | dev_hold(skb->dev); |
1409 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1410 | mod_timer(&tbl->proxy_timer, sched_next); | |
1411 | spin_unlock(&tbl->proxy_queue.lock); | |
1412 | } | |
0a204500 | 1413 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1414 | |
97fd5bc7 | 1415 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1416 | struct net *net, int ifindex) |
1417 | { | |
1418 | struct neigh_parms *p; | |
1419 | ||
75fbfd33 | 1420 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1421 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1422 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1423 | return p; |
1424 | } | |
1425 | ||
1426 | return NULL; | |
1427 | } | |
1da177e4 LT |
1428 | |
1429 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1430 | struct neigh_table *tbl) | |
1431 | { | |
cf89d6b2 | 1432 | struct neigh_parms *p; |
00829823 SH |
1433 | struct net *net = dev_net(dev); |
1434 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1435 | |
cf89d6b2 | 1436 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1437 | if (p) { |
1da177e4 LT |
1438 | p->tbl = tbl; |
1439 | atomic_set(&p->refcnt, 1); | |
1da177e4 | 1440 | p->reachable_time = |
1f9248e5 | 1441 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1442 | dev_hold(dev); |
1443 | p->dev = dev; | |
efd7ef1c | 1444 | write_pnet(&p->net, net); |
63134803 | 1445 | p->sysctl_table = NULL; |
c7fb64db | 1446 | |
00829823 | 1447 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1448 | dev_put(dev); |
486b51d3 DL |
1449 | kfree(p); |
1450 | return NULL; | |
1da177e4 | 1451 | } |
486b51d3 | 1452 | |
1da177e4 | 1453 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1454 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1455 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1456 | |
1457 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1458 | } |
1459 | return p; | |
1460 | } | |
0a204500 | 1461 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1462 | |
1463 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1464 | { | |
1465 | struct neigh_parms *parms = | |
1466 | container_of(head, struct neigh_parms, rcu_head); | |
1467 | ||
1468 | neigh_parms_put(parms); | |
1469 | } | |
1470 | ||
1471 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1472 | { | |
1da177e4 LT |
1473 | if (!parms || parms == &tbl->parms) |
1474 | return; | |
1475 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1476 | list_del(&parms->list); |
1477 | parms->dead = 1; | |
1da177e4 | 1478 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1479 | if (parms->dev) |
1480 | dev_put(parms->dev); | |
1481 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1482 | } |
0a204500 | 1483 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1484 | |
06f0511d | 1485 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1486 | { |
1487 | kfree(parms); | |
1488 | } | |
1489 | ||
c2ecba71 PE |
1490 | static struct lock_class_key neigh_table_proxy_queue_class; |
1491 | ||
d7480fd3 WC |
1492 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1493 | ||
1494 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1495 | { |
1496 | unsigned long now = jiffies; | |
1497 | unsigned long phsize; | |
1498 | ||
75fbfd33 ND |
1499 | INIT_LIST_HEAD(&tbl->parms_list); |
1500 | list_add(&tbl->parms.list, &tbl->parms_list); | |
e42ea986 | 1501 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1502 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1503 | tbl->parms.reachable_time = |
1f9248e5 | 1504 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1505 | |
1da177e4 LT |
1506 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1507 | if (!tbl->stats) | |
1508 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1509 | |
1da177e4 | 1510 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1511 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1512 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1513 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1514 | #endif |
1515 | ||
cd089336 | 1516 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1517 | |
1518 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1519 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1520 | |
d6bf7817 | 1521 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1522 | panic("cannot allocate neighbour cache hashes"); |
1523 | ||
08433eff YH |
1524 | if (!tbl->entry_size) |
1525 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1526 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1527 | else | |
1528 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1529 | ||
1da177e4 | 1530 | rwlock_init(&tbl->lock); |
203b42f7 | 1531 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1532 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1533 | tbl->parms.reachable_time); | |
b24b8a24 | 1534 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1535 | skb_queue_head_init_class(&tbl->proxy_queue, |
1536 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1537 | |
1538 | tbl->last_flush = now; | |
1539 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1540 | |
d7480fd3 | 1541 | neigh_tables[index] = tbl; |
1da177e4 | 1542 | } |
0a204500 | 1543 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1544 | |
d7480fd3 | 1545 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1546 | { |
d7480fd3 | 1547 | neigh_tables[index] = NULL; |
1da177e4 | 1548 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1549 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1550 | del_timer_sync(&tbl->proxy_timer); |
1551 | pneigh_queue_purge(&tbl->proxy_queue); | |
1552 | neigh_ifdown(tbl, NULL); | |
1553 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1554 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1555 | |
6193d2be ED |
1556 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1557 | neigh_hash_free_rcu); | |
d6bf7817 | 1558 | tbl->nht = NULL; |
1da177e4 LT |
1559 | |
1560 | kfree(tbl->phash_buckets); | |
1561 | tbl->phash_buckets = NULL; | |
1562 | ||
3f192b5c AD |
1563 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1564 | ||
3fcde74b KK |
1565 | free_percpu(tbl->stats); |
1566 | tbl->stats = NULL; | |
1567 | ||
1da177e4 LT |
1568 | return 0; |
1569 | } | |
0a204500 | 1570 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1571 | |
d7480fd3 WC |
1572 | static struct neigh_table *neigh_find_table(int family) |
1573 | { | |
1574 | struct neigh_table *tbl = NULL; | |
1575 | ||
1576 | switch (family) { | |
1577 | case AF_INET: | |
1578 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1579 | break; | |
1580 | case AF_INET6: | |
1581 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1582 | break; | |
1583 | case AF_DECnet: | |
1584 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1585 | break; | |
1586 | } | |
1587 | ||
1588 | return tbl; | |
1589 | } | |
1590 | ||
661d2967 | 1591 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1592 | { |
3b1e0a65 | 1593 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1594 | struct ndmsg *ndm; |
1595 | struct nlattr *dst_attr; | |
1da177e4 | 1596 | struct neigh_table *tbl; |
d7480fd3 | 1597 | struct neighbour *neigh; |
1da177e4 | 1598 | struct net_device *dev = NULL; |
a14a49d2 | 1599 | int err = -EINVAL; |
1da177e4 | 1600 | |
110b2499 | 1601 | ASSERT_RTNL(); |
a14a49d2 | 1602 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1603 | goto out; |
1604 | ||
a14a49d2 TG |
1605 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1606 | if (dst_attr == NULL) | |
1607 | goto out; | |
1608 | ||
1609 | ndm = nlmsg_data(nlh); | |
1610 | if (ndm->ndm_ifindex) { | |
110b2499 | 1611 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1612 | if (dev == NULL) { |
1613 | err = -ENODEV; | |
1614 | goto out; | |
1615 | } | |
1616 | } | |
1617 | ||
d7480fd3 WC |
1618 | tbl = neigh_find_table(ndm->ndm_family); |
1619 | if (tbl == NULL) | |
1620 | return -EAFNOSUPPORT; | |
1da177e4 | 1621 | |
d7480fd3 WC |
1622 | if (nla_len(dst_attr) < tbl->key_len) |
1623 | goto out; | |
1da177e4 | 1624 | |
d7480fd3 WC |
1625 | if (ndm->ndm_flags & NTF_PROXY) { |
1626 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1627 | goto out; | |
1628 | } | |
1da177e4 | 1629 | |
d7480fd3 WC |
1630 | if (dev == NULL) |
1631 | goto out; | |
a14a49d2 | 1632 | |
d7480fd3 WC |
1633 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1634 | if (neigh == NULL) { | |
1635 | err = -ENOENT; | |
110b2499 | 1636 | goto out; |
1da177e4 | 1637 | } |
d7480fd3 WC |
1638 | |
1639 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1640 | NEIGH_UPDATE_F_OVERRIDE | | |
1641 | NEIGH_UPDATE_F_ADMIN); | |
1642 | neigh_release(neigh); | |
a14a49d2 | 1643 | |
1da177e4 LT |
1644 | out: |
1645 | return err; | |
1646 | } | |
1647 | ||
661d2967 | 1648 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1649 | { |
d7480fd3 | 1650 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
3b1e0a65 | 1651 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1652 | struct ndmsg *ndm; |
1653 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1654 | struct neigh_table *tbl; |
1655 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1656 | struct neighbour *neigh; |
1657 | void *dst, *lladdr; | |
5208debd | 1658 | int err; |
1da177e4 | 1659 | |
110b2499 | 1660 | ASSERT_RTNL(); |
5208debd TG |
1661 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1662 | if (err < 0) | |
1da177e4 LT |
1663 | goto out; |
1664 | ||
5208debd TG |
1665 | err = -EINVAL; |
1666 | if (tb[NDA_DST] == NULL) | |
1667 | goto out; | |
1668 | ||
1669 | ndm = nlmsg_data(nlh); | |
1670 | if (ndm->ndm_ifindex) { | |
110b2499 | 1671 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1672 | if (dev == NULL) { |
1673 | err = -ENODEV; | |
1674 | goto out; | |
1675 | } | |
1676 | ||
1677 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
110b2499 | 1678 | goto out; |
5208debd TG |
1679 | } |
1680 | ||
d7480fd3 WC |
1681 | tbl = neigh_find_table(ndm->ndm_family); |
1682 | if (tbl == NULL) | |
1683 | return -EAFNOSUPPORT; | |
1da177e4 | 1684 | |
d7480fd3 WC |
1685 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1686 | goto out; | |
1687 | dst = nla_data(tb[NDA_DST]); | |
1688 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1689 | |
d7480fd3 WC |
1690 | if (ndm->ndm_flags & NTF_PROXY) { |
1691 | struct pneigh_entry *pn; | |
1692 | ||
1693 | err = -ENOBUFS; | |
1694 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1695 | if (pn) { | |
1696 | pn->flags = ndm->ndm_flags; | |
1697 | err = 0; | |
1698 | } | |
1699 | goto out; | |
1700 | } | |
1da177e4 | 1701 | |
d7480fd3 WC |
1702 | if (dev == NULL) |
1703 | goto out; | |
62dd9318 | 1704 | |
d7480fd3 WC |
1705 | neigh = neigh_lookup(tbl, dst, dev); |
1706 | if (neigh == NULL) { | |
1707 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1708 | err = -ENOENT; | |
110b2499 | 1709 | goto out; |
1da177e4 LT |
1710 | } |
1711 | ||
d7480fd3 WC |
1712 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1713 | if (IS_ERR(neigh)) { | |
1714 | err = PTR_ERR(neigh); | |
1715 | goto out; | |
1716 | } | |
1717 | } else { | |
1718 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1719 | err = -EEXIST; | |
1720 | neigh_release(neigh); | |
110b2499 | 1721 | goto out; |
5208debd | 1722 | } |
1da177e4 | 1723 | |
d7480fd3 WC |
1724 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1725 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1da177e4 LT |
1726 | } |
1727 | ||
d7480fd3 WC |
1728 | if (ndm->ndm_flags & NTF_USE) { |
1729 | neigh_event_send(neigh, NULL); | |
1730 | err = 0; | |
1731 | } else | |
1732 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
1733 | neigh_release(neigh); | |
1734 | ||
1da177e4 LT |
1735 | out: |
1736 | return err; | |
1737 | } | |
1738 | ||
c7fb64db TG |
1739 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1740 | { | |
ca860fb3 TG |
1741 | struct nlattr *nest; |
1742 | ||
1743 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1744 | if (nest == NULL) | |
1745 | return -ENOBUFS; | |
c7fb64db | 1746 | |
9a6308d7 DM |
1747 | if ((parms->dev && |
1748 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
1749 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || | |
1f9248e5 JP |
1750 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1751 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1752 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1753 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1754 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1755 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1756 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
1757 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
1758 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
1759 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
1760 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
1761 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
1762 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
1763 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
1764 | NDTPA_PAD) || | |
9a6308d7 | 1765 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 1766 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 1767 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 1768 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 1769 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 1770 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 1771 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 1772 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 1773 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 1774 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 1775 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 1776 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 1777 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
2175d87c | 1778 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD)) |
9a6308d7 | 1779 | goto nla_put_failure; |
ca860fb3 | 1780 | return nla_nest_end(skb, nest); |
c7fb64db | 1781 | |
ca860fb3 | 1782 | nla_put_failure: |
bc3ed28c TG |
1783 | nla_nest_cancel(skb, nest); |
1784 | return -EMSGSIZE; | |
c7fb64db TG |
1785 | } |
1786 | ||
ca860fb3 TG |
1787 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1788 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1789 | { |
1790 | struct nlmsghdr *nlh; | |
1791 | struct ndtmsg *ndtmsg; | |
1792 | ||
ca860fb3 TG |
1793 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1794 | if (nlh == NULL) | |
26932566 | 1795 | return -EMSGSIZE; |
c7fb64db | 1796 | |
ca860fb3 | 1797 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1798 | |
1799 | read_lock_bh(&tbl->lock); | |
1800 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1801 | ndtmsg->ndtm_pad1 = 0; |
1802 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1803 | |
9a6308d7 | 1804 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 1805 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
1806 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
1807 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
1808 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
1809 | goto nla_put_failure; | |
c7fb64db TG |
1810 | { |
1811 | unsigned long now = jiffies; | |
1812 | unsigned int flush_delta = now - tbl->last_flush; | |
1813 | unsigned int rand_delta = now - tbl->last_rand; | |
d6bf7817 | 1814 | struct neigh_hash_table *nht; |
c7fb64db TG |
1815 | struct ndt_config ndc = { |
1816 | .ndtc_key_len = tbl->key_len, | |
1817 | .ndtc_entry_size = tbl->entry_size, | |
1818 | .ndtc_entries = atomic_read(&tbl->entries), | |
1819 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1820 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
1821 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
1822 | }; | |
1823 | ||
d6bf7817 ED |
1824 | rcu_read_lock_bh(); |
1825 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 1826 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 1827 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
1828 | rcu_read_unlock_bh(); |
1829 | ||
9a6308d7 DM |
1830 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
1831 | goto nla_put_failure; | |
c7fb64db TG |
1832 | } |
1833 | ||
1834 | { | |
1835 | int cpu; | |
1836 | struct ndt_stats ndst; | |
1837 | ||
1838 | memset(&ndst, 0, sizeof(ndst)); | |
1839 | ||
6f912042 | 1840 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1841 | struct neigh_statistics *st; |
1842 | ||
c7fb64db TG |
1843 | st = per_cpu_ptr(tbl->stats, cpu); |
1844 | ndst.ndts_allocs += st->allocs; | |
1845 | ndst.ndts_destroys += st->destroys; | |
1846 | ndst.ndts_hash_grows += st->hash_grows; | |
1847 | ndst.ndts_res_failed += st->res_failed; | |
1848 | ndst.ndts_lookups += st->lookups; | |
1849 | ndst.ndts_hits += st->hits; | |
1850 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1851 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1852 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1853 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 1854 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
1855 | } |
1856 | ||
b676338f ND |
1857 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
1858 | NDTA_PAD)) | |
9a6308d7 | 1859 | goto nla_put_failure; |
c7fb64db TG |
1860 | } |
1861 | ||
1862 | BUG_ON(tbl->parms.dev); | |
1863 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1864 | goto nla_put_failure; |
c7fb64db TG |
1865 | |
1866 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1867 | nlmsg_end(skb, nlh); |
1868 | return 0; | |
c7fb64db | 1869 | |
ca860fb3 | 1870 | nla_put_failure: |
c7fb64db | 1871 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1872 | nlmsg_cancel(skb, nlh); |
1873 | return -EMSGSIZE; | |
c7fb64db TG |
1874 | } |
1875 | ||
ca860fb3 TG |
1876 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1877 | struct neigh_table *tbl, | |
c7fb64db | 1878 | struct neigh_parms *parms, |
ca860fb3 TG |
1879 | u32 pid, u32 seq, int type, |
1880 | unsigned int flags) | |
c7fb64db TG |
1881 | { |
1882 | struct ndtmsg *ndtmsg; | |
1883 | struct nlmsghdr *nlh; | |
1884 | ||
ca860fb3 TG |
1885 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1886 | if (nlh == NULL) | |
26932566 | 1887 | return -EMSGSIZE; |
c7fb64db | 1888 | |
ca860fb3 | 1889 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1890 | |
1891 | read_lock_bh(&tbl->lock); | |
1892 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1893 | ndtmsg->ndtm_pad1 = 0; |
1894 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1895 | |
ca860fb3 TG |
1896 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1897 | neightbl_fill_parms(skb, parms) < 0) | |
1898 | goto errout; | |
c7fb64db TG |
1899 | |
1900 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1901 | nlmsg_end(skb, nlh); |
1902 | return 0; | |
ca860fb3 | 1903 | errout: |
c7fb64db | 1904 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1905 | nlmsg_cancel(skb, nlh); |
1906 | return -EMSGSIZE; | |
c7fb64db | 1907 | } |
4ec93edb | 1908 | |
ef7c79ed | 1909 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1910 | [NDTA_NAME] = { .type = NLA_STRING }, |
1911 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1912 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1913 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1914 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1915 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1916 | }; | |
1917 | ||
ef7c79ed | 1918 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1919 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1920 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1921 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1922 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1923 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1924 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 1925 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
1926 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
1927 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1928 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1929 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1930 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1931 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1932 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1933 | }; | |
1934 | ||
661d2967 | 1935 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
c7fb64db | 1936 | { |
3b1e0a65 | 1937 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1938 | struct neigh_table *tbl; |
6b3f8674 TG |
1939 | struct ndtmsg *ndtmsg; |
1940 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
1941 | bool found = false; |
1942 | int err, tidx; | |
c7fb64db | 1943 | |
6b3f8674 TG |
1944 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1945 | nl_neightbl_policy); | |
1946 | if (err < 0) | |
1947 | goto errout; | |
c7fb64db | 1948 | |
6b3f8674 TG |
1949 | if (tb[NDTA_NAME] == NULL) { |
1950 | err = -EINVAL; | |
1951 | goto errout; | |
1952 | } | |
1953 | ||
1954 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
1955 | |
1956 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
1957 | tbl = neigh_tables[tidx]; | |
1958 | if (!tbl) | |
1959 | continue; | |
c7fb64db TG |
1960 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
1961 | continue; | |
d7480fd3 WC |
1962 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
1963 | found = true; | |
c7fb64db | 1964 | break; |
d7480fd3 | 1965 | } |
c7fb64db TG |
1966 | } |
1967 | ||
d7480fd3 WC |
1968 | if (!found) |
1969 | return -ENOENT; | |
c7fb64db | 1970 | |
4ec93edb | 1971 | /* |
c7fb64db TG |
1972 | * We acquire tbl->lock to be nice to the periodic timers and |
1973 | * make sure they always see a consistent set of values. | |
1974 | */ | |
1975 | write_lock_bh(&tbl->lock); | |
1976 | ||
6b3f8674 TG |
1977 | if (tb[NDTA_PARMS]) { |
1978 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1979 | struct neigh_parms *p; |
6b3f8674 | 1980 | int i, ifindex = 0; |
c7fb64db | 1981 | |
6b3f8674 TG |
1982 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1983 | nl_ntbl_parm_policy); | |
1984 | if (err < 0) | |
1985 | goto errout_tbl_lock; | |
c7fb64db | 1986 | |
6b3f8674 TG |
1987 | if (tbp[NDTPA_IFINDEX]) |
1988 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1989 | |
97fd5bc7 | 1990 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
1991 | if (p == NULL) { |
1992 | err = -ENOENT; | |
6b3f8674 | 1993 | goto errout_tbl_lock; |
c7fb64db | 1994 | } |
c7fb64db | 1995 | |
6b3f8674 TG |
1996 | for (i = 1; i <= NDTPA_MAX; i++) { |
1997 | if (tbp[i] == NULL) | |
1998 | continue; | |
c7fb64db | 1999 | |
6b3f8674 TG |
2000 | switch (i) { |
2001 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2002 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2003 | nla_get_u32(tbp[i]) * | |
2004 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2005 | break; |
2006 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2007 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2008 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2009 | break; |
2010 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2011 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2012 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2013 | break; |
2014 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2015 | NEIGH_VAR_SET(p, APP_PROBES, |
2016 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2017 | break; |
2018 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2019 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2020 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2021 | break; |
2022 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2023 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2024 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2025 | break; |
8da86466 YH |
2026 | case NDTPA_MCAST_REPROBES: |
2027 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2028 | nla_get_u32(tbp[i])); | |
2029 | break; | |
6b3f8674 | 2030 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2031 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2032 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2033 | /* update reachable_time as well, otherwise, the change will |
2034 | * only be effective after the next time neigh_periodic_work | |
2035 | * decides to recompute it (can be multiple minutes) | |
2036 | */ | |
2037 | p->reachable_time = | |
2038 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2039 | break; |
2040 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2041 | NEIGH_VAR_SET(p, GC_STALETIME, |
2042 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2043 | break; |
2044 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2045 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2046 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2047 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 TG |
2048 | break; |
2049 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2050 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2051 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2052 | break; |
2053 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2054 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2055 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2056 | break; |
2057 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2058 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2059 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2060 | break; |
2061 | case NDTPA_LOCKTIME: | |
3977458c JP |
2062 | NEIGH_VAR_SET(p, LOCKTIME, |
2063 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2064 | break; |
2065 | } | |
2066 | } | |
2067 | } | |
c7fb64db | 2068 | |
dc25c676 G |
2069 | err = -ENOENT; |
2070 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2071 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2072 | !net_eq(net, &init_net)) | |
2073 | goto errout_tbl_lock; | |
2074 | ||
6b3f8674 TG |
2075 | if (tb[NDTA_THRESH1]) |
2076 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2077 | |
6b3f8674 TG |
2078 | if (tb[NDTA_THRESH2]) |
2079 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2080 | |
6b3f8674 TG |
2081 | if (tb[NDTA_THRESH3]) |
2082 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2083 | |
6b3f8674 TG |
2084 | if (tb[NDTA_GC_INTERVAL]) |
2085 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2086 | |
2087 | err = 0; | |
2088 | ||
6b3f8674 | 2089 | errout_tbl_lock: |
c7fb64db | 2090 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2091 | errout: |
c7fb64db TG |
2092 | return err; |
2093 | } | |
2094 | ||
c8822a4e | 2095 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2096 | { |
3b1e0a65 | 2097 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2098 | int family, tidx, nidx = 0; |
2099 | int tbl_skip = cb->args[0]; | |
2100 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2101 | struct neigh_table *tbl; |
2102 | ||
ca860fb3 | 2103 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db | 2104 | |
d7480fd3 | 2105 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2106 | struct neigh_parms *p; |
2107 | ||
d7480fd3 WC |
2108 | tbl = neigh_tables[tidx]; |
2109 | if (!tbl) | |
2110 | continue; | |
2111 | ||
ca860fb3 | 2112 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2113 | continue; |
2114 | ||
15e47304 | 2115 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
ca860fb3 | 2116 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2117 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2118 | break; |
2119 | ||
75fbfd33 ND |
2120 | nidx = 0; |
2121 | p = list_next_entry(&tbl->parms, list); | |
2122 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2123 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2124 | continue; |
2125 | ||
efc683fc GK |
2126 | if (nidx < neigh_skip) |
2127 | goto next; | |
c7fb64db | 2128 | |
ca860fb3 | 2129 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2130 | NETLINK_CB(cb->skb).portid, |
ca860fb3 TG |
2131 | cb->nlh->nlmsg_seq, |
2132 | RTM_NEWNEIGHTBL, | |
7b46a644 | 2133 | NLM_F_MULTI) < 0) |
c7fb64db | 2134 | goto out; |
efc683fc GK |
2135 | next: |
2136 | nidx++; | |
c7fb64db TG |
2137 | } |
2138 | ||
ca860fb3 | 2139 | neigh_skip = 0; |
c7fb64db TG |
2140 | } |
2141 | out: | |
ca860fb3 TG |
2142 | cb->args[0] = tidx; |
2143 | cb->args[1] = nidx; | |
c7fb64db TG |
2144 | |
2145 | return skb->len; | |
2146 | } | |
1da177e4 | 2147 | |
8b8aec50 TG |
2148 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2149 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2150 | { |
2151 | unsigned long now = jiffies; | |
1da177e4 | 2152 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2153 | struct nlmsghdr *nlh; |
2154 | struct ndmsg *ndm; | |
2155 | ||
2156 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2157 | if (nlh == NULL) | |
26932566 | 2158 | return -EMSGSIZE; |
1da177e4 | 2159 | |
8b8aec50 TG |
2160 | ndm = nlmsg_data(nlh); |
2161 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2162 | ndm->ndm_pad1 = 0; |
2163 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2164 | ndm->ndm_flags = neigh->flags; |
2165 | ndm->ndm_type = neigh->type; | |
2166 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2167 | |
9a6308d7 DM |
2168 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2169 | goto nla_put_failure; | |
8b8aec50 TG |
2170 | |
2171 | read_lock_bh(&neigh->lock); | |
2172 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2173 | if (neigh->nud_state & NUD_VALID) { |
2174 | char haddr[MAX_ADDR_LEN]; | |
2175 | ||
2176 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2177 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2178 | read_unlock_bh(&neigh->lock); | |
2179 | goto nla_put_failure; | |
2180 | } | |
8b8aec50 TG |
2181 | } |
2182 | ||
b9f5f52c SH |
2183 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2184 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2185 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2186 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2187 | read_unlock_bh(&neigh->lock); | |
2188 | ||
9a6308d7 DM |
2189 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2190 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2191 | goto nla_put_failure; | |
8b8aec50 | 2192 | |
053c095a JB |
2193 | nlmsg_end(skb, nlh); |
2194 | return 0; | |
8b8aec50 TG |
2195 | |
2196 | nla_put_failure: | |
26932566 PM |
2197 | nlmsg_cancel(skb, nlh); |
2198 | return -EMSGSIZE; | |
1da177e4 LT |
2199 | } |
2200 | ||
84920c14 TZ |
2201 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2202 | u32 pid, u32 seq, int type, unsigned int flags, | |
2203 | struct neigh_table *tbl) | |
2204 | { | |
2205 | struct nlmsghdr *nlh; | |
2206 | struct ndmsg *ndm; | |
2207 | ||
2208 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2209 | if (nlh == NULL) | |
2210 | return -EMSGSIZE; | |
2211 | ||
2212 | ndm = nlmsg_data(nlh); | |
2213 | ndm->ndm_family = tbl->family; | |
2214 | ndm->ndm_pad1 = 0; | |
2215 | ndm->ndm_pad2 = 0; | |
2216 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2217 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2218 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2219 | ndm->ndm_state = NUD_NONE; |
2220 | ||
9a6308d7 DM |
2221 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2222 | goto nla_put_failure; | |
84920c14 | 2223 | |
053c095a JB |
2224 | nlmsg_end(skb, nlh); |
2225 | return 0; | |
84920c14 TZ |
2226 | |
2227 | nla_put_failure: | |
2228 | nlmsg_cancel(skb, nlh); | |
2229 | return -EMSGSIZE; | |
2230 | } | |
2231 | ||
d961db35 TG |
2232 | static void neigh_update_notify(struct neighbour *neigh) |
2233 | { | |
2234 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2235 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2236 | } | |
1da177e4 | 2237 | |
21fdd092 DA |
2238 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2239 | { | |
2240 | struct net_device *master; | |
2241 | ||
2242 | if (!master_idx) | |
2243 | return false; | |
2244 | ||
2245 | master = netdev_master_upper_dev_get(dev); | |
2246 | if (!master || master->ifindex != master_idx) | |
2247 | return true; | |
2248 | ||
2249 | return false; | |
2250 | } | |
2251 | ||
16660f0b DA |
2252 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2253 | { | |
2254 | if (filter_idx && dev->ifindex != filter_idx) | |
2255 | return true; | |
2256 | ||
2257 | return false; | |
2258 | } | |
2259 | ||
1da177e4 LT |
2260 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2261 | struct netlink_callback *cb) | |
2262 | { | |
767e97e1 | 2263 | struct net *net = sock_net(skb->sk); |
21fdd092 DA |
2264 | const struct nlmsghdr *nlh = cb->nlh; |
2265 | struct nlattr *tb[NDA_MAX + 1]; | |
1da177e4 LT |
2266 | struct neighbour *n; |
2267 | int rc, h, s_h = cb->args[1]; | |
2268 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2269 | struct neigh_hash_table *nht; |
16660f0b | 2270 | int filter_master_idx = 0, filter_idx = 0; |
21fdd092 DA |
2271 | unsigned int flags = NLM_F_MULTI; |
2272 | int err; | |
2273 | ||
2274 | err = nlmsg_parse(nlh, sizeof(struct ndmsg), tb, NDA_MAX, NULL); | |
2275 | if (!err) { | |
16660f0b DA |
2276 | if (tb[NDA_IFINDEX]) |
2277 | filter_idx = nla_get_u32(tb[NDA_IFINDEX]); | |
2278 | ||
21fdd092 DA |
2279 | if (tb[NDA_MASTER]) |
2280 | filter_master_idx = nla_get_u32(tb[NDA_MASTER]); | |
2281 | ||
16660f0b | 2282 | if (filter_idx || filter_master_idx) |
21fdd092 DA |
2283 | flags |= NLM_F_DUMP_FILTERED; |
2284 | } | |
1da177e4 | 2285 | |
d6bf7817 ED |
2286 | rcu_read_lock_bh(); |
2287 | nht = rcu_dereference_bh(tbl->nht); | |
2288 | ||
4bd6683b | 2289 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2290 | if (h > s_h) |
2291 | s_idx = 0; | |
767e97e1 ED |
2292 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2293 | n != NULL; | |
2294 | n = rcu_dereference_bh(n->next)) { | |
18502acd ZS |
2295 | if (idx < s_idx || !net_eq(dev_net(n->dev), net)) |
2296 | goto next; | |
2297 | if (neigh_ifindex_filtered(n->dev, filter_idx) || | |
2298 | neigh_master_filtered(n->dev, filter_master_idx)) | |
efc683fc | 2299 | goto next; |
15e47304 | 2300 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2301 | cb->nlh->nlmsg_seq, |
b6544c0b | 2302 | RTM_NEWNEIGH, |
21fdd092 | 2303 | flags) < 0) { |
1da177e4 LT |
2304 | rc = -1; |
2305 | goto out; | |
2306 | } | |
767e97e1 | 2307 | next: |
efc683fc | 2308 | idx++; |
1da177e4 | 2309 | } |
1da177e4 LT |
2310 | } |
2311 | rc = skb->len; | |
2312 | out: | |
d6bf7817 | 2313 | rcu_read_unlock_bh(); |
1da177e4 LT |
2314 | cb->args[1] = h; |
2315 | cb->args[2] = idx; | |
2316 | return rc; | |
2317 | } | |
2318 | ||
84920c14 TZ |
2319 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2320 | struct netlink_callback *cb) | |
2321 | { | |
2322 | struct pneigh_entry *n; | |
2323 | struct net *net = sock_net(skb->sk); | |
2324 | int rc, h, s_h = cb->args[3]; | |
2325 | int idx, s_idx = idx = cb->args[4]; | |
2326 | ||
2327 | read_lock_bh(&tbl->lock); | |
2328 | ||
4bd6683b | 2329 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2330 | if (h > s_h) |
2331 | s_idx = 0; | |
2332 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
18502acd | 2333 | if (idx < s_idx || pneigh_net(n) != net) |
84920c14 | 2334 | goto next; |
15e47304 | 2335 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 TZ |
2336 | cb->nlh->nlmsg_seq, |
2337 | RTM_NEWNEIGH, | |
7b46a644 | 2338 | NLM_F_MULTI, tbl) < 0) { |
84920c14 TZ |
2339 | read_unlock_bh(&tbl->lock); |
2340 | rc = -1; | |
2341 | goto out; | |
2342 | } | |
2343 | next: | |
2344 | idx++; | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | read_unlock_bh(&tbl->lock); | |
2349 | rc = skb->len; | |
2350 | out: | |
2351 | cb->args[3] = h; | |
2352 | cb->args[4] = idx; | |
2353 | return rc; | |
2354 | ||
2355 | } | |
2356 | ||
c8822a4e | 2357 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2358 | { |
2359 | struct neigh_table *tbl; | |
2360 | int t, family, s_t; | |
84920c14 | 2361 | int proxy = 0; |
4bd6683b | 2362 | int err; |
1da177e4 | 2363 | |
8b8aec50 | 2364 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
84920c14 TZ |
2365 | |
2366 | /* check for full ndmsg structure presence, family member is | |
2367 | * the same for both structures | |
2368 | */ | |
2369 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && | |
2370 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) | |
2371 | proxy = 1; | |
2372 | ||
1da177e4 LT |
2373 | s_t = cb->args[0]; |
2374 | ||
d7480fd3 WC |
2375 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2376 | tbl = neigh_tables[t]; | |
2377 | ||
2378 | if (!tbl) | |
2379 | continue; | |
1da177e4 LT |
2380 | if (t < s_t || (family && tbl->family != family)) |
2381 | continue; | |
2382 | if (t > s_t) | |
2383 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2384 | sizeof(cb->args[0])); | |
84920c14 TZ |
2385 | if (proxy) |
2386 | err = pneigh_dump_table(tbl, skb, cb); | |
2387 | else | |
2388 | err = neigh_dump_table(tbl, skb, cb); | |
4bd6683b ED |
2389 | if (err < 0) |
2390 | break; | |
1da177e4 | 2391 | } |
1da177e4 LT |
2392 | |
2393 | cb->args[0] = t; | |
2394 | return skb->len; | |
2395 | } | |
2396 | ||
2397 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2398 | { | |
2399 | int chain; | |
d6bf7817 | 2400 | struct neigh_hash_table *nht; |
1da177e4 | 2401 | |
d6bf7817 ED |
2402 | rcu_read_lock_bh(); |
2403 | nht = rcu_dereference_bh(tbl->nht); | |
2404 | ||
767e97e1 | 2405 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2406 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2407 | struct neighbour *n; |
2408 | ||
767e97e1 ED |
2409 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2410 | n != NULL; | |
2411 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2412 | cb(n, cookie); |
2413 | } | |
d6bf7817 ED |
2414 | read_unlock(&tbl->lock); |
2415 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2416 | } |
2417 | EXPORT_SYMBOL(neigh_for_each); | |
2418 | ||
2419 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2420 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2421 | int (*cb)(struct neighbour *)) | |
2422 | { | |
2423 | int chain; | |
d6bf7817 | 2424 | struct neigh_hash_table *nht; |
1da177e4 | 2425 | |
d6bf7817 ED |
2426 | nht = rcu_dereference_protected(tbl->nht, |
2427 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2428 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2429 | struct neighbour *n; |
2430 | struct neighbour __rcu **np; | |
1da177e4 | 2431 | |
d6bf7817 | 2432 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2433 | while ((n = rcu_dereference_protected(*np, |
2434 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2435 | int release; |
2436 | ||
2437 | write_lock(&n->lock); | |
2438 | release = cb(n); | |
2439 | if (release) { | |
767e97e1 ED |
2440 | rcu_assign_pointer(*np, |
2441 | rcu_dereference_protected(n->next, | |
2442 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
2443 | n->dead = 1; |
2444 | } else | |
2445 | np = &n->next; | |
2446 | write_unlock(&n->lock); | |
4f494554 TG |
2447 | if (release) |
2448 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2449 | } |
2450 | } | |
2451 | } | |
2452 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2453 | ||
b79bda3d | 2454 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2455 | const void *addr, struct sk_buff *skb) |
2456 | { | |
b79bda3d EB |
2457 | int err = -EAFNOSUPPORT; |
2458 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2459 | struct neigh_table *tbl; |
2460 | struct neighbour *neigh; | |
2461 | ||
b79bda3d | 2462 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2463 | if (!tbl) |
2464 | goto out; | |
b560f03d | 2465 | rcu_read_lock_bh(); |
4fd3d7d9 EB |
2466 | neigh = __neigh_lookup_noref(tbl, addr, dev); |
2467 | if (!neigh) | |
2468 | neigh = __neigh_create(tbl, addr, dev, false); | |
2469 | err = PTR_ERR(neigh); | |
b560f03d DB |
2470 | if (IS_ERR(neigh)) { |
2471 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 2472 | goto out_kfree_skb; |
b560f03d | 2473 | } |
4fd3d7d9 | 2474 | err = neigh->output(neigh, skb); |
b560f03d | 2475 | rcu_read_unlock_bh(); |
4fd3d7d9 | 2476 | } |
b79bda3d EB |
2477 | else if (index == NEIGH_LINK_TABLE) { |
2478 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
2479 | addr, NULL, skb->len); | |
2480 | if (err < 0) | |
2481 | goto out_kfree_skb; | |
2482 | err = dev_queue_xmit(skb); | |
2483 | } | |
4fd3d7d9 EB |
2484 | out: |
2485 | return err; | |
2486 | out_kfree_skb: | |
2487 | kfree_skb(skb); | |
2488 | goto out; | |
2489 | } | |
2490 | EXPORT_SYMBOL(neigh_xmit); | |
2491 | ||
1da177e4 LT |
2492 | #ifdef CONFIG_PROC_FS |
2493 | ||
2494 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2495 | { | |
2496 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2497 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2498 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2499 | struct neighbour *n = NULL; |
2500 | int bucket = state->bucket; | |
2501 | ||
2502 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 2503 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 2504 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
2505 | |
2506 | while (n) { | |
878628fb | 2507 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2508 | goto next; |
1da177e4 LT |
2509 | if (state->neigh_sub_iter) { |
2510 | loff_t fakep = 0; | |
2511 | void *v; | |
2512 | ||
2513 | v = state->neigh_sub_iter(state, n, &fakep); | |
2514 | if (!v) | |
2515 | goto next; | |
2516 | } | |
2517 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2518 | break; | |
2519 | if (n->nud_state & ~NUD_NOARP) | |
2520 | break; | |
767e97e1 ED |
2521 | next: |
2522 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2523 | } |
2524 | ||
2525 | if (n) | |
2526 | break; | |
2527 | } | |
2528 | state->bucket = bucket; | |
2529 | ||
2530 | return n; | |
2531 | } | |
2532 | ||
2533 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2534 | struct neighbour *n, | |
2535 | loff_t *pos) | |
2536 | { | |
2537 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2538 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2539 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2540 | |
2541 | if (state->neigh_sub_iter) { | |
2542 | void *v = state->neigh_sub_iter(state, n, pos); | |
2543 | if (v) | |
2544 | return n; | |
2545 | } | |
767e97e1 | 2546 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
2547 | |
2548 | while (1) { | |
2549 | while (n) { | |
878628fb | 2550 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2551 | goto next; |
1da177e4 LT |
2552 | if (state->neigh_sub_iter) { |
2553 | void *v = state->neigh_sub_iter(state, n, pos); | |
2554 | if (v) | |
2555 | return n; | |
2556 | goto next; | |
2557 | } | |
2558 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2559 | break; | |
2560 | ||
2561 | if (n->nud_state & ~NUD_NOARP) | |
2562 | break; | |
767e97e1 ED |
2563 | next: |
2564 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2565 | } |
2566 | ||
2567 | if (n) | |
2568 | break; | |
2569 | ||
cd089336 | 2570 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
2571 | break; |
2572 | ||
767e97e1 | 2573 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
2574 | } |
2575 | ||
2576 | if (n && pos) | |
2577 | --(*pos); | |
2578 | return n; | |
2579 | } | |
2580 | ||
2581 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2582 | { | |
2583 | struct neighbour *n = neigh_get_first(seq); | |
2584 | ||
2585 | if (n) { | |
745e2031 | 2586 | --(*pos); |
1da177e4 LT |
2587 | while (*pos) { |
2588 | n = neigh_get_next(seq, n, pos); | |
2589 | if (!n) | |
2590 | break; | |
2591 | } | |
2592 | } | |
2593 | return *pos ? NULL : n; | |
2594 | } | |
2595 | ||
2596 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2597 | { | |
2598 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2599 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2600 | struct neigh_table *tbl = state->tbl; |
2601 | struct pneigh_entry *pn = NULL; | |
2602 | int bucket = state->bucket; | |
2603 | ||
2604 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2605 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2606 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2607 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2608 | pn = pn->next; |
1da177e4 LT |
2609 | if (pn) |
2610 | break; | |
2611 | } | |
2612 | state->bucket = bucket; | |
2613 | ||
2614 | return pn; | |
2615 | } | |
2616 | ||
2617 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2618 | struct pneigh_entry *pn, | |
2619 | loff_t *pos) | |
2620 | { | |
2621 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2622 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2623 | struct neigh_table *tbl = state->tbl; |
2624 | ||
df07a94c JBD |
2625 | do { |
2626 | pn = pn->next; | |
2627 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
2628 | ||
1da177e4 LT |
2629 | while (!pn) { |
2630 | if (++state->bucket > PNEIGH_HASHMASK) | |
2631 | break; | |
2632 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2633 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2634 | pn = pn->next; |
1da177e4 LT |
2635 | if (pn) |
2636 | break; | |
2637 | } | |
2638 | ||
2639 | if (pn && pos) | |
2640 | --(*pos); | |
2641 | ||
2642 | return pn; | |
2643 | } | |
2644 | ||
2645 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2646 | { | |
2647 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2648 | ||
2649 | if (pn) { | |
745e2031 | 2650 | --(*pos); |
1da177e4 LT |
2651 | while (*pos) { |
2652 | pn = pneigh_get_next(seq, pn, pos); | |
2653 | if (!pn) | |
2654 | break; | |
2655 | } | |
2656 | } | |
2657 | return *pos ? NULL : pn; | |
2658 | } | |
2659 | ||
2660 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2661 | { | |
2662 | struct neigh_seq_state *state = seq->private; | |
2663 | void *rc; | |
745e2031 | 2664 | loff_t idxpos = *pos; |
1da177e4 | 2665 | |
745e2031 | 2666 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2667 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2668 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2669 | |
2670 | return rc; | |
2671 | } | |
2672 | ||
2673 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
d6bf7817 | 2674 | __acquires(rcu_bh) |
1da177e4 LT |
2675 | { |
2676 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2677 | |
2678 | state->tbl = tbl; | |
2679 | state->bucket = 0; | |
2680 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2681 | ||
d6bf7817 ED |
2682 | rcu_read_lock_bh(); |
2683 | state->nht = rcu_dereference_bh(tbl->nht); | |
767e97e1 | 2684 | |
745e2031 | 2685 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2686 | } |
2687 | EXPORT_SYMBOL(neigh_seq_start); | |
2688 | ||
2689 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2690 | { | |
2691 | struct neigh_seq_state *state; | |
2692 | void *rc; | |
2693 | ||
2694 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2695 | rc = neigh_get_first(seq); |
1da177e4 LT |
2696 | goto out; |
2697 | } | |
2698 | ||
2699 | state = seq->private; | |
2700 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2701 | rc = neigh_get_next(seq, v, NULL); | |
2702 | if (rc) | |
2703 | goto out; | |
2704 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2705 | rc = pneigh_get_first(seq); | |
2706 | } else { | |
2707 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2708 | rc = pneigh_get_next(seq, v, NULL); | |
2709 | } | |
2710 | out: | |
2711 | ++(*pos); | |
2712 | return rc; | |
2713 | } | |
2714 | EXPORT_SYMBOL(neigh_seq_next); | |
2715 | ||
2716 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
d6bf7817 | 2717 | __releases(rcu_bh) |
1da177e4 | 2718 | { |
d6bf7817 | 2719 | rcu_read_unlock_bh(); |
1da177e4 LT |
2720 | } |
2721 | EXPORT_SYMBOL(neigh_seq_stop); | |
2722 | ||
2723 | /* statistics via seq_file */ | |
2724 | ||
2725 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2726 | { | |
81c1ebfc | 2727 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2728 | int cpu; |
2729 | ||
2730 | if (*pos == 0) | |
2731 | return SEQ_START_TOKEN; | |
4ec93edb | 2732 | |
0f23174a | 2733 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2734 | if (!cpu_possible(cpu)) |
2735 | continue; | |
2736 | *pos = cpu+1; | |
2737 | return per_cpu_ptr(tbl->stats, cpu); | |
2738 | } | |
2739 | return NULL; | |
2740 | } | |
2741 | ||
2742 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2743 | { | |
81c1ebfc | 2744 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2745 | int cpu; |
2746 | ||
0f23174a | 2747 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2748 | if (!cpu_possible(cpu)) |
2749 | continue; | |
2750 | *pos = cpu+1; | |
2751 | return per_cpu_ptr(tbl->stats, cpu); | |
2752 | } | |
2753 | return NULL; | |
2754 | } | |
2755 | ||
2756 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2757 | { | |
2758 | ||
2759 | } | |
2760 | ||
2761 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2762 | { | |
81c1ebfc | 2763 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2764 | struct neigh_statistics *st = v; |
2765 | ||
2766 | if (v == SEQ_START_TOKEN) { | |
fb811395 | 2767 | 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 |
2768 | return 0; |
2769 | } | |
2770 | ||
2771 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
fb811395 | 2772 | "%08lx %08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2773 | atomic_read(&tbl->entries), |
2774 | ||
2775 | st->allocs, | |
2776 | st->destroys, | |
2777 | st->hash_grows, | |
2778 | ||
2779 | st->lookups, | |
2780 | st->hits, | |
2781 | ||
2782 | st->res_failed, | |
2783 | ||
2784 | st->rcv_probes_mcast, | |
2785 | st->rcv_probes_ucast, | |
2786 | ||
2787 | st->periodic_gc_runs, | |
9a6d276e | 2788 | st->forced_gc_runs, |
fb811395 RJ |
2789 | st->unres_discards, |
2790 | st->table_fulls | |
1da177e4 LT |
2791 | ); |
2792 | ||
2793 | return 0; | |
2794 | } | |
2795 | ||
f690808e | 2796 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2797 | .start = neigh_stat_seq_start, |
2798 | .next = neigh_stat_seq_next, | |
2799 | .stop = neigh_stat_seq_stop, | |
2800 | .show = neigh_stat_seq_show, | |
2801 | }; | |
2802 | ||
2803 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2804 | { | |
2805 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2806 | ||
2807 | if (!ret) { | |
2808 | struct seq_file *sf = file->private_data; | |
d9dda78b | 2809 | sf->private = PDE_DATA(inode); |
1da177e4 LT |
2810 | } |
2811 | return ret; | |
2812 | }; | |
2813 | ||
9a32144e | 2814 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2815 | .owner = THIS_MODULE, |
2816 | .open = neigh_stat_seq_open, | |
2817 | .read = seq_read, | |
2818 | .llseek = seq_lseek, | |
2819 | .release = seq_release, | |
2820 | }; | |
2821 | ||
2822 | #endif /* CONFIG_PROC_FS */ | |
2823 | ||
339bf98f TG |
2824 | static inline size_t neigh_nlmsg_size(void) |
2825 | { | |
2826 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2827 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2828 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2829 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2830 | + nla_total_size(4); /* NDA_PROBES */ | |
2831 | } | |
2832 | ||
b8673311 | 2833 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2834 | { |
c346dca1 | 2835 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2836 | struct sk_buff *skb; |
b8673311 | 2837 | int err = -ENOBUFS; |
1da177e4 | 2838 | |
339bf98f | 2839 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2840 | if (skb == NULL) |
b8673311 | 2841 | goto errout; |
1da177e4 | 2842 | |
b8673311 | 2843 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2844 | if (err < 0) { |
2845 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2846 | WARN_ON(err == -EMSGSIZE); | |
2847 | kfree_skb(skb); | |
2848 | goto errout; | |
2849 | } | |
1ce85fe4 PNA |
2850 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2851 | return; | |
b8673311 TG |
2852 | errout: |
2853 | if (err < 0) | |
426b5303 | 2854 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2855 | } |
2856 | ||
b8673311 | 2857 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2858 | { |
b8673311 TG |
2859 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2860 | } | |
0a204500 | 2861 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2862 | |
2863 | #ifdef CONFIG_SYSCTL | |
b93196dc | 2864 | static int zero; |
555445cd | 2865 | static int int_max = INT_MAX; |
b93196dc | 2866 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 2867 | |
fe2c6338 JP |
2868 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
2869 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
2870 | { |
2871 | int size, ret; | |
fe2c6338 | 2872 | struct ctl_table tmp = *ctl; |
8b5c171b | 2873 | |
ce46cc64 SW |
2874 | tmp.extra1 = &zero; |
2875 | tmp.extra2 = &unres_qlen_max; | |
8b5c171b | 2876 | tmp.data = &size; |
ce46cc64 SW |
2877 | |
2878 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
2879 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2880 | ||
8b5c171b ED |
2881 | if (write && !ret) |
2882 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
2883 | return ret; | |
2884 | } | |
2885 | ||
1d4c8c29 JP |
2886 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
2887 | int family) | |
2888 | { | |
bba24896 JP |
2889 | switch (family) { |
2890 | case AF_INET: | |
1d4c8c29 | 2891 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
2892 | case AF_INET6: |
2893 | return __in6_dev_nd_parms_get_rcu(dev); | |
2894 | } | |
1d4c8c29 JP |
2895 | return NULL; |
2896 | } | |
2897 | ||
2898 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
2899 | int index) | |
2900 | { | |
2901 | struct net_device *dev; | |
2902 | int family = neigh_parms_family(p); | |
2903 | ||
2904 | rcu_read_lock(); | |
2905 | for_each_netdev_rcu(net, dev) { | |
2906 | struct neigh_parms *dst_p = | |
2907 | neigh_get_dev_parms_rcu(dev, family); | |
2908 | ||
2909 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
2910 | dst_p->data[index] = p->data[index]; | |
2911 | } | |
2912 | rcu_read_unlock(); | |
2913 | } | |
2914 | ||
2915 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
2916 | { | |
2917 | struct net_device *dev = ctl->extra1; | |
2918 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 2919 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
2920 | int index = (int *) ctl->data - p->data; |
2921 | ||
2922 | if (!write) | |
2923 | return; | |
2924 | ||
2925 | set_bit(index, p->data_state); | |
2a4501ae | 2926 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
1d4c8c29 JP |
2927 | if (!dev) /* NULL dev means this is default value */ |
2928 | neigh_copy_dflt_parms(net, p, index); | |
2929 | } | |
2930 | ||
1f9248e5 JP |
2931 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
2932 | void __user *buffer, | |
2933 | size_t *lenp, loff_t *ppos) | |
2934 | { | |
2935 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 2936 | int ret; |
1f9248e5 JP |
2937 | |
2938 | tmp.extra1 = &zero; | |
2939 | tmp.extra2 = &int_max; | |
2940 | ||
1d4c8c29 JP |
2941 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
2942 | neigh_proc_update(ctl, write); | |
2943 | return ret; | |
1f9248e5 JP |
2944 | } |
2945 | ||
cb5b09c1 JP |
2946 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
2947 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2948 | { | |
1d4c8c29 JP |
2949 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
2950 | ||
2951 | neigh_proc_update(ctl, write); | |
2952 | return ret; | |
cb5b09c1 JP |
2953 | } |
2954 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
2955 | ||
2956 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
2957 | void __user *buffer, | |
2958 | size_t *lenp, loff_t *ppos) | |
2959 | { | |
1d4c8c29 JP |
2960 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
2961 | ||
2962 | neigh_proc_update(ctl, write); | |
2963 | return ret; | |
cb5b09c1 JP |
2964 | } |
2965 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
2966 | ||
2967 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
2968 | void __user *buffer, | |
2969 | size_t *lenp, loff_t *ppos) | |
2970 | { | |
1d4c8c29 JP |
2971 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
2972 | ||
2973 | neigh_proc_update(ctl, write); | |
2974 | return ret; | |
cb5b09c1 JP |
2975 | } |
2976 | ||
2977 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
2978 | void __user *buffer, | |
2979 | size_t *lenp, loff_t *ppos) | |
2980 | { | |
1d4c8c29 JP |
2981 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
2982 | ||
2983 | neigh_proc_update(ctl, write); | |
2984 | return ret; | |
cb5b09c1 JP |
2985 | } |
2986 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
2987 | ||
2988 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
2989 | void __user *buffer, | |
2990 | size_t *lenp, loff_t *ppos) | |
2991 | { | |
1d4c8c29 JP |
2992 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
2993 | ||
2994 | neigh_proc_update(ctl, write); | |
2995 | return ret; | |
cb5b09c1 JP |
2996 | } |
2997 | ||
4bf6980d JFR |
2998 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
2999 | void __user *buffer, | |
3000 | size_t *lenp, loff_t *ppos) | |
3001 | { | |
3002 | struct neigh_parms *p = ctl->extra2; | |
3003 | int ret; | |
3004 | ||
3005 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3006 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3007 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3008 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3009 | else | |
3010 | ret = -1; | |
3011 | ||
3012 | if (write && ret == 0) { | |
3013 | /* update reachable_time as well, otherwise, the change will | |
3014 | * only be effective after the next time neigh_periodic_work | |
3015 | * decides to recompute it | |
3016 | */ | |
3017 | p->reachable_time = | |
3018 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3019 | } | |
3020 | return ret; | |
3021 | } | |
3022 | ||
1f9248e5 JP |
3023 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3024 | (&((struct neigh_parms *) 0)->data[index]) | |
3025 | ||
3026 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3027 | [NEIGH_VAR_ ## attr] = { \ | |
3028 | .procname = name, \ | |
3029 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3030 | .maxlen = sizeof(int), \ | |
3031 | .mode = mval, \ | |
3032 | .proc_handler = proc, \ | |
3033 | } | |
3034 | ||
3035 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3036 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3037 | ||
3038 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3039 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3040 | |
3041 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3042 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 JP |
3043 | |
3044 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3045 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3046 | |
3047 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3048 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3049 | |
3050 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3051 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3052 | |
1da177e4 LT |
3053 | static struct neigh_sysctl_table { |
3054 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3055 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3056 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3057 | .neigh_vars = { |
1f9248e5 JP |
3058 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3059 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3060 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3061 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3062 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3063 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3064 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3065 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3066 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3067 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3068 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3069 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3070 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3071 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3072 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3073 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3074 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3075 | .procname = "gc_interval", |
3076 | .maxlen = sizeof(int), | |
3077 | .mode = 0644, | |
6d9f239a | 3078 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3079 | }, |
8b5c171b | 3080 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3081 | .procname = "gc_thresh1", |
3082 | .maxlen = sizeof(int), | |
3083 | .mode = 0644, | |
555445cd FF |
3084 | .extra1 = &zero, |
3085 | .extra2 = &int_max, | |
3086 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3087 | }, |
8b5c171b | 3088 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3089 | .procname = "gc_thresh2", |
3090 | .maxlen = sizeof(int), | |
3091 | .mode = 0644, | |
555445cd FF |
3092 | .extra1 = &zero, |
3093 | .extra2 = &int_max, | |
3094 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3095 | }, |
8b5c171b | 3096 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3097 | .procname = "gc_thresh3", |
3098 | .maxlen = sizeof(int), | |
3099 | .mode = 0644, | |
555445cd FF |
3100 | .extra1 = &zero, |
3101 | .extra2 = &int_max, | |
3102 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3103 | }, |
c3bac5a7 | 3104 | {}, |
1da177e4 LT |
3105 | }, |
3106 | }; | |
3107 | ||
3108 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3109 | proc_handler *handler) |
1da177e4 | 3110 | { |
1f9248e5 | 3111 | int i; |
3c607bbb | 3112 | struct neigh_sysctl_table *t; |
1f9248e5 | 3113 | const char *dev_name_source; |
8f40a1f9 | 3114 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3115 | char *p_name; |
1da177e4 | 3116 | |
3c607bbb | 3117 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3118 | if (!t) |
3c607bbb PE |
3119 | goto err; |
3120 | ||
b194c1f1 | 3121 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3122 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3123 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3124 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3125 | } |
1da177e4 LT |
3126 | |
3127 | if (dev) { | |
3128 | dev_name_source = dev->name; | |
d12af679 | 3129 | /* Terminate the table early */ |
8b5c171b ED |
3130 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3131 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3132 | } else { |
9ecf07a1 | 3133 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3134 | dev_name_source = "default"; |
9ecf07a1 MK |
3135 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3136 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3137 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3138 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3139 | } |
3140 | ||
f8572d8f | 3141 | if (handler) { |
1da177e4 | 3142 | /* RetransTime */ |
8b5c171b | 3143 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3144 | /* ReachableTime */ |
8b5c171b | 3145 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3146 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3147 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3148 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3149 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3150 | } else { |
3151 | /* Those handlers will update p->reachable_time after | |
3152 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3153 | * applied after the next neighbour update instead of waiting for | |
3154 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3155 | * So any handler that replaces them should do this as well | |
3156 | */ | |
3157 | /* ReachableTime */ | |
3158 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3159 | neigh_proc_base_reachable_time; | |
3160 | /* ReachableTime (in milliseconds) */ | |
3161 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3162 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3163 | } |
3164 | ||
464dc801 EB |
3165 | /* Don't export sysctls to unprivileged users */ |
3166 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3167 | t->neigh_vars[0].procname = NULL; | |
3168 | ||
73af614a JP |
3169 | switch (neigh_parms_family(p)) { |
3170 | case AF_INET: | |
3171 | p_name = "ipv4"; | |
3172 | break; | |
3173 | case AF_INET6: | |
3174 | p_name = "ipv6"; | |
3175 | break; | |
3176 | default: | |
3177 | BUG(); | |
3178 | } | |
3179 | ||
8f40a1f9 EB |
3180 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3181 | p_name, dev_name_source); | |
4ab438fc | 3182 | t->sysctl_header = |
8f40a1f9 | 3183 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3184 | if (!t->sysctl_header) |
8f40a1f9 | 3185 | goto free; |
3c607bbb | 3186 | |
1da177e4 LT |
3187 | p->sysctl_table = t; |
3188 | return 0; | |
3189 | ||
3c607bbb | 3190 | free: |
1da177e4 | 3191 | kfree(t); |
3c607bbb PE |
3192 | err: |
3193 | return -ENOBUFS; | |
1da177e4 | 3194 | } |
0a204500 | 3195 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3196 | |
3197 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3198 | { | |
3199 | if (p->sysctl_table) { | |
3200 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3201 | p->sysctl_table = NULL; | |
5dd3df10 | 3202 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3203 | kfree(t); |
3204 | } | |
3205 | } | |
0a204500 | 3206 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3207 | |
3208 | #endif /* CONFIG_SYSCTL */ | |
3209 | ||
c8822a4e TG |
3210 | static int __init neigh_init(void) |
3211 | { | |
c7ac8679 GR |
3212 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
3213 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); | |
3214 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); | |
c8822a4e | 3215 | |
c7ac8679 GR |
3216 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
3217 | NULL); | |
3218 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); | |
c8822a4e TG |
3219 | |
3220 | return 0; | |
3221 | } | |
3222 | ||
3223 | subsys_initcall(neigh_init); | |
3224 |