Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Generic address resolution entity | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Fixes: | |
14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
15 | * Harald Welte Add neighbour cache statistics like rtstat | |
16 | */ | |
17 | ||
e005d193 JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/socket.h> | |
1da177e4 LT |
25 | #include <linux/netdevice.h> |
26 | #include <linux/proc_fs.h> | |
27 | #ifdef CONFIG_SYSCTL | |
28 | #include <linux/sysctl.h> | |
29 | #endif | |
30 | #include <linux/times.h> | |
457c4cbc | 31 | #include <net/net_namespace.h> |
1da177e4 LT |
32 | #include <net/neighbour.h> |
33 | #include <net/dst.h> | |
34 | #include <net/sock.h> | |
8d71740c | 35 | #include <net/netevent.h> |
a14a49d2 | 36 | #include <net/netlink.h> |
1da177e4 LT |
37 | #include <linux/rtnetlink.h> |
38 | #include <linux/random.h> | |
543537bd | 39 | #include <linux/string.h> |
c3609d51 | 40 | #include <linux/log2.h> |
1d4c8c29 | 41 | #include <linux/inetdevice.h> |
bba24896 | 42 | #include <net/addrconf.h> |
1da177e4 | 43 | |
d5d427cd | 44 | #define DEBUG |
1da177e4 | 45 | #define NEIGH_DEBUG 1 |
d5d427cd JP |
46 | #define neigh_dbg(level, fmt, ...) \ |
47 | do { \ | |
48 | if (level <= NEIGH_DEBUG) \ | |
49 | pr_debug(fmt, ##__VA_ARGS__); \ | |
50 | } while (0) | |
1da177e4 LT |
51 | |
52 | #define PNEIGH_HASHMASK 0xF | |
53 | ||
54 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
55 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
56 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 57 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 | 58 | |
45fc3b11 | 59 | #ifdef CONFIG_PROC_FS |
9a32144e | 60 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 61 | #endif |
1da177e4 LT |
62 | |
63 | /* | |
64 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
65 | ||
66 | - All the scans/updates to hash buckets MUST be made under this lock. | |
67 | - NOTHING clever should be made under this lock: no callbacks | |
68 | to protocol backends, no attempts to send something to network. | |
69 | It will result in deadlocks, if backend/driver wants to use neighbour | |
70 | cache. | |
71 | - If the entry requires some non-trivial actions, increase | |
72 | its reference count and release table lock. | |
73 | ||
74 | Neighbour entries are protected: | |
75 | - with reference count. | |
76 | - with rwlock neigh->lock | |
77 | ||
78 | Reference count prevents destruction. | |
79 | ||
80 | neigh->lock mainly serializes ll address data and its validity state. | |
81 | However, the same lock is used to protect another entry fields: | |
82 | - timer | |
83 | - resolution queue | |
84 | ||
85 | Again, nothing clever shall be made under neigh->lock, | |
86 | the most complicated procedure, which we allow is dev->hard_header. | |
87 | It is supposed, that dev->hard_header is simplistic and does | |
88 | not make callbacks to neighbour tables. | |
1da177e4 LT |
89 | */ |
90 | ||
8f40b161 | 91 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
92 | { |
93 | kfree_skb(skb); | |
94 | return -ENETDOWN; | |
95 | } | |
96 | ||
4f494554 TG |
97 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
98 | { | |
99 | if (neigh->parms->neigh_cleanup) | |
100 | neigh->parms->neigh_cleanup(neigh); | |
101 | ||
d961db35 | 102 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
103 | neigh_release(neigh); |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
108 | * It corresponds to default IPv6 settings and is not overridable, | |
109 | * because it is really reasonable choice. | |
110 | */ | |
111 | ||
112 | unsigned long neigh_rand_reach_time(unsigned long base) | |
113 | { | |
63862b5b | 114 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 115 | } |
0a204500 | 116 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 LT |
117 | |
118 | ||
119 | static int neigh_forced_gc(struct neigh_table *tbl) | |
120 | { | |
121 | int shrunk = 0; | |
122 | int i; | |
d6bf7817 | 123 | struct neigh_hash_table *nht; |
1da177e4 LT |
124 | |
125 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
126 | ||
127 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
128 | nht = rcu_dereference_protected(tbl->nht, |
129 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 130 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
131 | struct neighbour *n; |
132 | struct neighbour __rcu **np; | |
1da177e4 | 133 | |
d6bf7817 | 134 | np = &nht->hash_buckets[i]; |
767e97e1 ED |
135 | while ((n = rcu_dereference_protected(*np, |
136 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
137 | /* Neighbour record may be discarded if: |
138 | * - nobody refers to it. | |
139 | * - it is not permanent | |
140 | */ | |
141 | write_lock(&n->lock); | |
142 | if (atomic_read(&n->refcnt) == 1 && | |
143 | !(n->nud_state & NUD_PERMANENT)) { | |
767e97e1 ED |
144 | rcu_assign_pointer(*np, |
145 | rcu_dereference_protected(n->next, | |
146 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
147 | n->dead = 1; |
148 | shrunk = 1; | |
149 | write_unlock(&n->lock); | |
4f494554 | 150 | neigh_cleanup_and_release(n); |
1da177e4 LT |
151 | continue; |
152 | } | |
153 | write_unlock(&n->lock); | |
154 | np = &n->next; | |
155 | } | |
156 | } | |
157 | ||
158 | tbl->last_flush = jiffies; | |
159 | ||
160 | write_unlock_bh(&tbl->lock); | |
161 | ||
162 | return shrunk; | |
163 | } | |
164 | ||
a43d8994 PE |
165 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
166 | { | |
167 | neigh_hold(n); | |
168 | if (unlikely(mod_timer(&n->timer, when))) { | |
169 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
170 | n->nud_state); | |
171 | dump_stack(); | |
172 | } | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int neigh_del_timer(struct neighbour *n) |
176 | { | |
177 | if ((n->nud_state & NUD_IN_TIMER) && | |
178 | del_timer(&n->timer)) { | |
179 | neigh_release(n); | |
180 | return 1; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
186 | { | |
187 | struct sk_buff *skb; | |
188 | ||
189 | while ((skb = skb_dequeue(list)) != NULL) { | |
190 | dev_put(skb->dev); | |
191 | kfree_skb(skb); | |
192 | } | |
193 | } | |
194 | ||
49636bb1 | 195 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
196 | { |
197 | int i; | |
d6bf7817 | 198 | struct neigh_hash_table *nht; |
1da177e4 | 199 | |
d6bf7817 ED |
200 | nht = rcu_dereference_protected(tbl->nht, |
201 | lockdep_is_held(&tbl->lock)); | |
202 | ||
cd089336 | 203 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
204 | struct neighbour *n; |
205 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 206 | |
767e97e1 ED |
207 | while ((n = rcu_dereference_protected(*np, |
208 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
209 | if (dev && n->dev != dev) { |
210 | np = &n->next; | |
211 | continue; | |
212 | } | |
767e97e1 ED |
213 | rcu_assign_pointer(*np, |
214 | rcu_dereference_protected(n->next, | |
215 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
216 | write_lock(&n->lock); |
217 | neigh_del_timer(n); | |
218 | n->dead = 1; | |
219 | ||
220 | if (atomic_read(&n->refcnt) != 1) { | |
221 | /* The most unpleasant situation. | |
222 | We must destroy neighbour entry, | |
223 | but someone still uses it. | |
224 | ||
225 | The destroy will be delayed until | |
226 | the last user releases us, but | |
227 | we must kill timers etc. and move | |
228 | it to safe state. | |
229 | */ | |
c9ab4d85 | 230 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 231 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
232 | n->output = neigh_blackhole; |
233 | if (n->nud_state & NUD_VALID) | |
234 | n->nud_state = NUD_NOARP; | |
235 | else | |
236 | n->nud_state = NUD_NONE; | |
d5d427cd | 237 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
238 | } |
239 | write_unlock(&n->lock); | |
4f494554 | 240 | neigh_cleanup_and_release(n); |
1da177e4 LT |
241 | } |
242 | } | |
49636bb1 | 243 | } |
1da177e4 | 244 | |
49636bb1 HX |
245 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
246 | { | |
247 | write_lock_bh(&tbl->lock); | |
248 | neigh_flush_dev(tbl, dev); | |
249 | write_unlock_bh(&tbl->lock); | |
250 | } | |
0a204500 | 251 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
252 | |
253 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
254 | { | |
255 | write_lock_bh(&tbl->lock); | |
256 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
257 | pneigh_ifdown(tbl, dev); |
258 | write_unlock_bh(&tbl->lock); | |
259 | ||
260 | del_timer_sync(&tbl->proxy_timer); | |
261 | pneigh_queue_purge(&tbl->proxy_queue); | |
262 | return 0; | |
263 | } | |
0a204500 | 264 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 265 | |
596b9b68 | 266 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
267 | { |
268 | struct neighbour *n = NULL; | |
269 | unsigned long now = jiffies; | |
270 | int entries; | |
271 | ||
272 | entries = atomic_inc_return(&tbl->entries) - 1; | |
273 | if (entries >= tbl->gc_thresh3 || | |
274 | (entries >= tbl->gc_thresh2 && | |
275 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
276 | if (!neigh_forced_gc(tbl) && | |
277 | entries >= tbl->gc_thresh3) | |
278 | goto out_entries; | |
279 | } | |
280 | ||
08433eff | 281 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
282 | if (!n) |
283 | goto out_entries; | |
284 | ||
c9ab4d85 | 285 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 286 | rwlock_init(&n->lock); |
0ed8ddf4 | 287 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
288 | n->updated = n->used = now; |
289 | n->nud_state = NUD_NONE; | |
290 | n->output = neigh_blackhole; | |
f6b72b62 | 291 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 292 | n->parms = neigh_parms_clone(&tbl->parms); |
b24b8a24 | 293 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
294 | |
295 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
296 | n->tbl = tbl; | |
297 | atomic_set(&n->refcnt, 1); | |
298 | n->dead = 1; | |
299 | out: | |
300 | return n; | |
301 | ||
302 | out_entries: | |
303 | atomic_dec(&tbl->entries); | |
304 | goto out; | |
305 | } | |
306 | ||
2c2aba6c DM |
307 | static void neigh_get_hash_rnd(u32 *x) |
308 | { | |
309 | get_random_bytes(x, sizeof(*x)); | |
310 | *x |= 1; | |
311 | } | |
312 | ||
cd089336 | 313 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 314 | { |
cd089336 | 315 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 316 | struct neigh_hash_table *ret; |
6193d2be | 317 | struct neighbour __rcu **buckets; |
2c2aba6c | 318 | int i; |
1da177e4 | 319 | |
d6bf7817 ED |
320 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
321 | if (!ret) | |
322 | return NULL; | |
323 | if (size <= PAGE_SIZE) | |
324 | buckets = kzalloc(size, GFP_ATOMIC); | |
325 | else | |
6193d2be | 326 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
327 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
328 | get_order(size)); | |
329 | if (!buckets) { | |
330 | kfree(ret); | |
331 | return NULL; | |
1da177e4 | 332 | } |
6193d2be | 333 | ret->hash_buckets = buckets; |
cd089336 | 334 | ret->hash_shift = shift; |
2c2aba6c DM |
335 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
336 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
337 | return ret; |
338 | } | |
339 | ||
d6bf7817 | 340 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 341 | { |
d6bf7817 ED |
342 | struct neigh_hash_table *nht = container_of(head, |
343 | struct neigh_hash_table, | |
344 | rcu); | |
cd089336 | 345 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 346 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 LT |
347 | |
348 | if (size <= PAGE_SIZE) | |
d6bf7817 | 349 | kfree(buckets); |
1da177e4 | 350 | else |
d6bf7817 ED |
351 | free_pages((unsigned long)buckets, get_order(size)); |
352 | kfree(nht); | |
1da177e4 LT |
353 | } |
354 | ||
d6bf7817 | 355 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 356 | unsigned long new_shift) |
1da177e4 | 357 | { |
d6bf7817 ED |
358 | unsigned int i, hash; |
359 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
360 | |
361 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
362 | ||
d6bf7817 ED |
363 | old_nht = rcu_dereference_protected(tbl->nht, |
364 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 365 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
366 | if (!new_nht) |
367 | return old_nht; | |
1da177e4 | 368 | |
cd089336 | 369 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
370 | struct neighbour *n, *next; |
371 | ||
767e97e1 ED |
372 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
373 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
374 | n != NULL; |
375 | n = next) { | |
376 | hash = tbl->hash(n->primary_key, n->dev, | |
377 | new_nht->hash_rnd); | |
1da177e4 | 378 | |
cd089336 | 379 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
380 | next = rcu_dereference_protected(n->next, |
381 | lockdep_is_held(&tbl->lock)); | |
382 | ||
383 | rcu_assign_pointer(n->next, | |
384 | rcu_dereference_protected( | |
385 | new_nht->hash_buckets[hash], | |
386 | lockdep_is_held(&tbl->lock))); | |
387 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
388 | } |
389 | } | |
1da177e4 | 390 | |
d6bf7817 ED |
391 | rcu_assign_pointer(tbl->nht, new_nht); |
392 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
393 | return new_nht; | |
1da177e4 LT |
394 | } |
395 | ||
396 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
397 | struct net_device *dev) | |
398 | { | |
399 | struct neighbour *n; | |
400 | int key_len = tbl->key_len; | |
bc4bf5f3 | 401 | u32 hash_val; |
d6bf7817 | 402 | struct neigh_hash_table *nht; |
4ec93edb | 403 | |
1da177e4 LT |
404 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
405 | ||
d6bf7817 ED |
406 | rcu_read_lock_bh(); |
407 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 408 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
409 | |
410 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
411 | n != NULL; | |
412 | n = rcu_dereference_bh(n->next)) { | |
1da177e4 | 413 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
767e97e1 ED |
414 | if (!atomic_inc_not_zero(&n->refcnt)) |
415 | n = NULL; | |
1da177e4 LT |
416 | NEIGH_CACHE_STAT_INC(tbl, hits); |
417 | break; | |
418 | } | |
419 | } | |
767e97e1 | 420 | |
d6bf7817 | 421 | rcu_read_unlock_bh(); |
1da177e4 LT |
422 | return n; |
423 | } | |
0a204500 | 424 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 425 | |
426b5303 EB |
426 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
427 | const void *pkey) | |
1da177e4 LT |
428 | { |
429 | struct neighbour *n; | |
430 | int key_len = tbl->key_len; | |
bc4bf5f3 | 431 | u32 hash_val; |
d6bf7817 | 432 | struct neigh_hash_table *nht; |
1da177e4 LT |
433 | |
434 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
435 | ||
d6bf7817 ED |
436 | rcu_read_lock_bh(); |
437 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 438 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
439 | |
440 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
441 | n != NULL; | |
442 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 443 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 444 | net_eq(dev_net(n->dev), net)) { |
767e97e1 ED |
445 | if (!atomic_inc_not_zero(&n->refcnt)) |
446 | n = NULL; | |
1da177e4 LT |
447 | NEIGH_CACHE_STAT_INC(tbl, hits); |
448 | break; | |
449 | } | |
450 | } | |
767e97e1 | 451 | |
d6bf7817 | 452 | rcu_read_unlock_bh(); |
1da177e4 LT |
453 | return n; |
454 | } | |
0a204500 | 455 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 456 | |
a263b309 DM |
457 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
458 | struct net_device *dev, bool want_ref) | |
1da177e4 LT |
459 | { |
460 | u32 hash_val; | |
461 | int key_len = tbl->key_len; | |
462 | int error; | |
596b9b68 | 463 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
d6bf7817 | 464 | struct neigh_hash_table *nht; |
1da177e4 LT |
465 | |
466 | if (!n) { | |
467 | rc = ERR_PTR(-ENOBUFS); | |
468 | goto out; | |
469 | } | |
470 | ||
471 | memcpy(n->primary_key, pkey, key_len); | |
472 | n->dev = dev; | |
473 | dev_hold(dev); | |
474 | ||
475 | /* Protocol specific setup. */ | |
476 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
477 | rc = ERR_PTR(error); | |
478 | goto out_neigh_release; | |
479 | } | |
480 | ||
da6a8fa0 DM |
481 | if (dev->netdev_ops->ndo_neigh_construct) { |
482 | error = dev->netdev_ops->ndo_neigh_construct(n); | |
483 | if (error < 0) { | |
484 | rc = ERR_PTR(error); | |
485 | goto out_neigh_release; | |
486 | } | |
487 | } | |
488 | ||
447f2191 DM |
489 | /* Device specific setup. */ |
490 | if (n->parms->neigh_setup && | |
491 | (error = n->parms->neigh_setup(n)) < 0) { | |
492 | rc = ERR_PTR(error); | |
493 | goto out_neigh_release; | |
494 | } | |
495 | ||
1f9248e5 | 496 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
497 | |
498 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
499 | nht = rcu_dereference_protected(tbl->nht, |
500 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 501 | |
cd089336 DM |
502 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
503 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 504 | |
cd089336 | 505 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
506 | |
507 | if (n->parms->dead) { | |
508 | rc = ERR_PTR(-EINVAL); | |
509 | goto out_tbl_unlock; | |
510 | } | |
511 | ||
767e97e1 ED |
512 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
513 | lockdep_is_held(&tbl->lock)); | |
514 | n1 != NULL; | |
515 | n1 = rcu_dereference_protected(n1->next, | |
516 | lockdep_is_held(&tbl->lock))) { | |
1da177e4 | 517 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
a263b309 DM |
518 | if (want_ref) |
519 | neigh_hold(n1); | |
1da177e4 LT |
520 | rc = n1; |
521 | goto out_tbl_unlock; | |
522 | } | |
523 | } | |
524 | ||
1da177e4 | 525 | n->dead = 0; |
a263b309 DM |
526 | if (want_ref) |
527 | neigh_hold(n); | |
767e97e1 ED |
528 | rcu_assign_pointer(n->next, |
529 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
530 | lockdep_is_held(&tbl->lock))); | |
531 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 532 | write_unlock_bh(&tbl->lock); |
d5d427cd | 533 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
534 | rc = n; |
535 | out: | |
536 | return rc; | |
537 | out_tbl_unlock: | |
538 | write_unlock_bh(&tbl->lock); | |
539 | out_neigh_release: | |
540 | neigh_release(n); | |
541 | goto out; | |
542 | } | |
a263b309 | 543 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 544 | |
be01d655 | 545 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 546 | { |
fa86d322 | 547 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
548 | hash_val ^= (hash_val >> 16); |
549 | hash_val ^= hash_val >> 8; | |
550 | hash_val ^= hash_val >> 4; | |
551 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
552 | return hash_val; |
553 | } | |
fa86d322 | 554 | |
be01d655 YH |
555 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
556 | struct net *net, | |
557 | const void *pkey, | |
558 | int key_len, | |
559 | struct net_device *dev) | |
560 | { | |
561 | while (n) { | |
fa86d322 | 562 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 563 | net_eq(pneigh_net(n), net) && |
fa86d322 | 564 | (n->dev == dev || !n->dev)) |
be01d655 YH |
565 | return n; |
566 | n = n->next; | |
fa86d322 | 567 | } |
be01d655 YH |
568 | return NULL; |
569 | } | |
fa86d322 | 570 | |
be01d655 YH |
571 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
572 | struct net *net, const void *pkey, struct net_device *dev) | |
573 | { | |
574 | int key_len = tbl->key_len; | |
575 | u32 hash_val = pneigh_hash(pkey, key_len); | |
576 | ||
577 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
578 | net, pkey, key_len, dev); | |
fa86d322 | 579 | } |
0a204500 | 580 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 581 | |
426b5303 EB |
582 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
583 | struct net *net, const void *pkey, | |
1da177e4 LT |
584 | struct net_device *dev, int creat) |
585 | { | |
586 | struct pneigh_entry *n; | |
587 | int key_len = tbl->key_len; | |
be01d655 | 588 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
589 | |
590 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
591 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
592 | net, pkey, key_len, dev); | |
1da177e4 | 593 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
594 | |
595 | if (n || !creat) | |
1da177e4 LT |
596 | goto out; |
597 | ||
4ae28944 PE |
598 | ASSERT_RTNL(); |
599 | ||
1da177e4 LT |
600 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
601 | if (!n) | |
602 | goto out; | |
603 | ||
e42ea986 | 604 | write_pnet(&n->net, hold_net(net)); |
1da177e4 LT |
605 | memcpy(n->key, pkey, key_len); |
606 | n->dev = dev; | |
607 | if (dev) | |
608 | dev_hold(dev); | |
609 | ||
610 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
611 | if (dev) | |
612 | dev_put(dev); | |
da12f735 | 613 | release_net(net); |
1da177e4 LT |
614 | kfree(n); |
615 | n = NULL; | |
616 | goto out; | |
617 | } | |
618 | ||
619 | write_lock_bh(&tbl->lock); | |
620 | n->next = tbl->phash_buckets[hash_val]; | |
621 | tbl->phash_buckets[hash_val] = n; | |
622 | write_unlock_bh(&tbl->lock); | |
623 | out: | |
624 | return n; | |
625 | } | |
0a204500 | 626 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
627 | |
628 | ||
426b5303 | 629 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
630 | struct net_device *dev) |
631 | { | |
632 | struct pneigh_entry *n, **np; | |
633 | int key_len = tbl->key_len; | |
be01d655 | 634 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
635 | |
636 | write_lock_bh(&tbl->lock); | |
637 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
638 | np = &n->next) { | |
426b5303 | 639 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 640 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
641 | *np = n->next; |
642 | write_unlock_bh(&tbl->lock); | |
643 | if (tbl->pdestructor) | |
644 | tbl->pdestructor(n); | |
645 | if (n->dev) | |
646 | dev_put(n->dev); | |
57da52c1 | 647 | release_net(pneigh_net(n)); |
1da177e4 LT |
648 | kfree(n); |
649 | return 0; | |
650 | } | |
651 | } | |
652 | write_unlock_bh(&tbl->lock); | |
653 | return -ENOENT; | |
654 | } | |
655 | ||
656 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
657 | { | |
658 | struct pneigh_entry *n, **np; | |
659 | u32 h; | |
660 | ||
661 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
662 | np = &tbl->phash_buckets[h]; | |
663 | while ((n = *np) != NULL) { | |
664 | if (!dev || n->dev == dev) { | |
665 | *np = n->next; | |
666 | if (tbl->pdestructor) | |
667 | tbl->pdestructor(n); | |
668 | if (n->dev) | |
669 | dev_put(n->dev); | |
57da52c1 | 670 | release_net(pneigh_net(n)); |
1da177e4 LT |
671 | kfree(n); |
672 | continue; | |
673 | } | |
674 | np = &n->next; | |
675 | } | |
676 | } | |
677 | return -ENOENT; | |
678 | } | |
679 | ||
06f0511d DL |
680 | static void neigh_parms_destroy(struct neigh_parms *parms); |
681 | ||
682 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
683 | { | |
684 | if (atomic_dec_and_test(&parms->refcnt)) | |
685 | neigh_parms_destroy(parms); | |
686 | } | |
1da177e4 LT |
687 | |
688 | /* | |
689 | * neighbour must already be out of the table; | |
690 | * | |
691 | */ | |
692 | void neigh_destroy(struct neighbour *neigh) | |
693 | { | |
da6a8fa0 DM |
694 | struct net_device *dev = neigh->dev; |
695 | ||
1da177e4 LT |
696 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
697 | ||
698 | if (!neigh->dead) { | |
e005d193 | 699 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
700 | dump_stack(); |
701 | return; | |
702 | } | |
703 | ||
704 | if (neigh_del_timer(neigh)) | |
e005d193 | 705 | pr_warn("Impossible event\n"); |
1da177e4 | 706 | |
c9ab4d85 ED |
707 | write_lock_bh(&neigh->lock); |
708 | __skb_queue_purge(&neigh->arp_queue); | |
709 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 710 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 711 | |
447f2191 DM |
712 | if (dev->netdev_ops->ndo_neigh_destroy) |
713 | dev->netdev_ops->ndo_neigh_destroy(neigh); | |
714 | ||
da6a8fa0 | 715 | dev_put(dev); |
1da177e4 LT |
716 | neigh_parms_put(neigh->parms); |
717 | ||
d5d427cd | 718 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
719 | |
720 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 721 | kfree_rcu(neigh, rcu); |
1da177e4 | 722 | } |
0a204500 | 723 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
724 | |
725 | /* Neighbour state is suspicious; | |
726 | disable fast path. | |
727 | ||
728 | Called with write_locked neigh. | |
729 | */ | |
730 | static void neigh_suspect(struct neighbour *neigh) | |
731 | { | |
d5d427cd | 732 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
733 | |
734 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
735 | } |
736 | ||
737 | /* Neighbour state is OK; | |
738 | enable fast path. | |
739 | ||
740 | Called with write_locked neigh. | |
741 | */ | |
742 | static void neigh_connect(struct neighbour *neigh) | |
743 | { | |
d5d427cd | 744 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
745 | |
746 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
747 | } |
748 | ||
e4c4e448 | 749 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 750 | { |
e4c4e448 | 751 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
752 | struct neighbour *n; |
753 | struct neighbour __rcu **np; | |
e4c4e448 | 754 | unsigned int i; |
d6bf7817 | 755 | struct neigh_hash_table *nht; |
1da177e4 LT |
756 | |
757 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
758 | ||
e4c4e448 | 759 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
760 | nht = rcu_dereference_protected(tbl->nht, |
761 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
762 | |
763 | /* | |
764 | * periodically recompute ReachableTime from random function | |
765 | */ | |
766 | ||
e4c4e448 | 767 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 768 | struct neigh_parms *p; |
e4c4e448 | 769 | tbl->last_rand = jiffies; |
75fbfd33 | 770 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 771 | p->reachable_time = |
1f9248e5 | 772 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
773 | } |
774 | ||
feff9ab2 DJ |
775 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
776 | goto out; | |
777 | ||
cd089336 | 778 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 779 | np = &nht->hash_buckets[i]; |
1da177e4 | 780 | |
767e97e1 ED |
781 | while ((n = rcu_dereference_protected(*np, |
782 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 783 | unsigned int state; |
1da177e4 | 784 | |
e4c4e448 | 785 | write_lock(&n->lock); |
1da177e4 | 786 | |
e4c4e448 ED |
787 | state = n->nud_state; |
788 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
789 | write_unlock(&n->lock); | |
790 | goto next_elt; | |
791 | } | |
1da177e4 | 792 | |
e4c4e448 ED |
793 | if (time_before(n->used, n->confirmed)) |
794 | n->used = n->confirmed; | |
1da177e4 | 795 | |
e4c4e448 ED |
796 | if (atomic_read(&n->refcnt) == 1 && |
797 | (state == NUD_FAILED || | |
1f9248e5 | 798 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 ED |
799 | *np = n->next; |
800 | n->dead = 1; | |
801 | write_unlock(&n->lock); | |
802 | neigh_cleanup_and_release(n); | |
803 | continue; | |
804 | } | |
1da177e4 | 805 | write_unlock(&n->lock); |
1da177e4 LT |
806 | |
807 | next_elt: | |
e4c4e448 ED |
808 | np = &n->next; |
809 | } | |
810 | /* | |
811 | * It's fine to release lock here, even if hash table | |
812 | * grows while we are preempted. | |
813 | */ | |
814 | write_unlock_bh(&tbl->lock); | |
815 | cond_resched(); | |
816 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
817 | nht = rcu_dereference_protected(tbl->nht, |
818 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 819 | } |
2724680b | 820 | out: |
1f9248e5 JP |
821 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
822 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
823 | * BASE_REACHABLE_TIME. | |
1da177e4 | 824 | */ |
f618002b | 825 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 826 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 827 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
828 | } |
829 | ||
830 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
831 | { | |
832 | struct neigh_parms *p = n->parms; | |
a960ff81 TT |
833 | int max_probes = NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES); |
834 | if (!(n->nud_state & NUD_PROBE)) | |
835 | max_probes += NEIGH_VAR(p, MCAST_PROBES); | |
836 | return max_probes; | |
1da177e4 LT |
837 | } |
838 | ||
5ef12d98 | 839 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
840 | __releases(neigh->lock) |
841 | __acquires(neigh->lock) | |
5ef12d98 TT |
842 | { |
843 | struct sk_buff *skb; | |
844 | ||
845 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 846 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
847 | neigh->updated = jiffies; |
848 | ||
849 | /* It is very thin place. report_unreachable is very complicated | |
850 | routine. Particularly, it can hit the same neighbour entry! | |
851 | ||
852 | So that, we try to be accurate and avoid dead loop. --ANK | |
853 | */ | |
854 | while (neigh->nud_state == NUD_FAILED && | |
855 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
856 | write_unlock(&neigh->lock); | |
857 | neigh->ops->error_report(neigh, skb); | |
858 | write_lock(&neigh->lock); | |
859 | } | |
c9ab4d85 | 860 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 861 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
862 | } |
863 | ||
cd28ca0a ED |
864 | static void neigh_probe(struct neighbour *neigh) |
865 | __releases(neigh->lock) | |
866 | { | |
4ed377e3 | 867 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
868 | /* keep skb alive even if arp_queue overflows */ |
869 | if (skb) | |
870 | skb = skb_copy(skb, GFP_ATOMIC); | |
871 | write_unlock(&neigh->lock); | |
872 | neigh->ops->solicit(neigh, skb); | |
873 | atomic_inc(&neigh->probes); | |
874 | kfree_skb(skb); | |
875 | } | |
876 | ||
1da177e4 LT |
877 | /* Called when a timer expires for a neighbour entry. */ |
878 | ||
879 | static void neigh_timer_handler(unsigned long arg) | |
880 | { | |
881 | unsigned long now, next; | |
882 | struct neighbour *neigh = (struct neighbour *)arg; | |
95c96174 | 883 | unsigned int state; |
1da177e4 LT |
884 | int notify = 0; |
885 | ||
886 | write_lock(&neigh->lock); | |
887 | ||
888 | state = neigh->nud_state; | |
889 | now = jiffies; | |
890 | next = now + HZ; | |
891 | ||
045f7b3b | 892 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 893 | goto out; |
1da177e4 LT |
894 | |
895 | if (state & NUD_REACHABLE) { | |
4ec93edb | 896 | if (time_before_eq(now, |
1da177e4 | 897 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 898 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
899 | next = neigh->confirmed + neigh->parms->reachable_time; |
900 | } else if (time_before_eq(now, | |
1f9248e5 JP |
901 | neigh->used + |
902 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 903 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 904 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 905 | neigh->updated = jiffies; |
1da177e4 | 906 | neigh_suspect(neigh); |
1f9248e5 | 907 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 908 | } else { |
d5d427cd | 909 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 910 | neigh->nud_state = NUD_STALE; |
955aaa2f | 911 | neigh->updated = jiffies; |
1da177e4 | 912 | neigh_suspect(neigh); |
8d71740c | 913 | notify = 1; |
1da177e4 LT |
914 | } |
915 | } else if (state & NUD_DELAY) { | |
4ec93edb | 916 | if (time_before_eq(now, |
1f9248e5 JP |
917 | neigh->confirmed + |
918 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 919 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 920 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 921 | neigh->updated = jiffies; |
1da177e4 | 922 | neigh_connect(neigh); |
8d71740c | 923 | notify = 1; |
1da177e4 LT |
924 | next = neigh->confirmed + neigh->parms->reachable_time; |
925 | } else { | |
d5d427cd | 926 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 927 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 928 | neigh->updated = jiffies; |
1da177e4 | 929 | atomic_set(&neigh->probes, 0); |
1f9248e5 | 930 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
931 | } |
932 | } else { | |
933 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
1f9248e5 | 934 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
935 | } |
936 | ||
937 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
938 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
939 | neigh->nud_state = NUD_FAILED; |
940 | notify = 1; | |
5ef12d98 | 941 | neigh_invalidate(neigh); |
5e2c21dc | 942 | goto out; |
1da177e4 LT |
943 | } |
944 | ||
945 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
946 | if (time_before(next, jiffies + HZ/2)) |
947 | next = jiffies + HZ/2; | |
6fb9974f HX |
948 | if (!mod_timer(&neigh->timer, next)) |
949 | neigh_hold(neigh); | |
1da177e4 LT |
950 | } |
951 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 952 | neigh_probe(neigh); |
9ff56607 | 953 | } else { |
69cc64d8 | 954 | out: |
9ff56607 DM |
955 | write_unlock(&neigh->lock); |
956 | } | |
d961db35 | 957 | |
8d71740c | 958 | if (notify) |
d961db35 | 959 | neigh_update_notify(neigh); |
1da177e4 | 960 | |
1da177e4 LT |
961 | neigh_release(neigh); |
962 | } | |
963 | ||
964 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
965 | { | |
966 | int rc; | |
cd28ca0a | 967 | bool immediate_probe = false; |
1da177e4 LT |
968 | |
969 | write_lock_bh(&neigh->lock); | |
970 | ||
971 | rc = 0; | |
972 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
973 | goto out_unlock_bh; | |
974 | ||
1da177e4 | 975 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
976 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
977 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
978 | unsigned long next, now = jiffies; |
979 | ||
1f9248e5 JP |
980 | atomic_set(&neigh->probes, |
981 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
1da177e4 | 982 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 983 | neigh->updated = now; |
1f9248e5 JP |
984 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
985 | HZ/2); | |
cd28ca0a ED |
986 | neigh_add_timer(neigh, next); |
987 | immediate_probe = true; | |
1da177e4 LT |
988 | } else { |
989 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 990 | neigh->updated = jiffies; |
1da177e4 LT |
991 | write_unlock_bh(&neigh->lock); |
992 | ||
f3fbbe0f | 993 | kfree_skb(skb); |
1da177e4 LT |
994 | return 1; |
995 | } | |
996 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 997 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 998 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 999 | neigh->updated = jiffies; |
1f9248e5 JP |
1000 | neigh_add_timer(neigh, jiffies + |
1001 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
1005 | if (skb) { | |
8b5c171b | 1006 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1007 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1008 | struct sk_buff *buff; |
8b5c171b | 1009 | |
f72051b0 | 1010 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1011 | if (!buff) |
1012 | break; | |
1013 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1014 | kfree_skb(buff); |
9a6d276e | 1015 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1016 | } |
a4731138 | 1017 | skb_dst_force(skb); |
1da177e4 | 1018 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1019 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1020 | } |
1021 | rc = 1; | |
1022 | } | |
1023 | out_unlock_bh: | |
cd28ca0a ED |
1024 | if (immediate_probe) |
1025 | neigh_probe(neigh); | |
1026 | else | |
1027 | write_unlock(&neigh->lock); | |
1028 | local_bh_enable(); | |
1da177e4 LT |
1029 | return rc; |
1030 | } | |
0a204500 | 1031 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1032 | |
f6b72b62 | 1033 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1034 | { |
1035 | struct hh_cache *hh; | |
3b04ddde | 1036 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1037 | = NULL; |
1038 | ||
1039 | if (neigh->dev->header_ops) | |
1040 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1041 | |
1042 | if (update) { | |
f6b72b62 DM |
1043 | hh = &neigh->hh; |
1044 | if (hh->hh_len) { | |
3644f0ce | 1045 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1046 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1047 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1048 | } |
1049 | } | |
1050 | } | |
1051 | ||
1052 | ||
1053 | ||
1054 | /* Generic update routine. | |
1055 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1056 | -- new is new state. | |
1057 | -- flags | |
1058 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1059 | if it is different. | |
1060 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1061 | lladdr instead of overriding it |
1da177e4 LT |
1062 | if it is different. |
1063 | It also allows to retain current state | |
1064 | if lladdr is unchanged. | |
1065 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
1066 | ||
4ec93edb | 1067 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1068 | NTF_ROUTER flag. |
1069 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1070 | a router. | |
1071 | ||
1072 | Caller MUST hold reference count on the entry. | |
1073 | */ | |
1074 | ||
1075 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1076 | u32 flags) | |
1077 | { | |
1078 | u8 old; | |
1079 | int err; | |
1da177e4 | 1080 | int notify = 0; |
1da177e4 LT |
1081 | struct net_device *dev; |
1082 | int update_isrouter = 0; | |
1083 | ||
1084 | write_lock_bh(&neigh->lock); | |
1085 | ||
1086 | dev = neigh->dev; | |
1087 | old = neigh->nud_state; | |
1088 | err = -EPERM; | |
1089 | ||
4ec93edb | 1090 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1091 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1092 | goto out; | |
1093 | ||
1094 | if (!(new & NUD_VALID)) { | |
1095 | neigh_del_timer(neigh); | |
1096 | if (old & NUD_CONNECTED) | |
1097 | neigh_suspect(neigh); | |
1098 | neigh->nud_state = new; | |
1099 | err = 0; | |
1da177e4 | 1100 | notify = old & NUD_VALID; |
5ef12d98 TT |
1101 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
1102 | (new & NUD_FAILED)) { | |
1103 | neigh_invalidate(neigh); | |
1104 | notify = 1; | |
1105 | } | |
1da177e4 LT |
1106 | goto out; |
1107 | } | |
1108 | ||
1109 | /* Compare new lladdr with cached one */ | |
1110 | if (!dev->addr_len) { | |
1111 | /* First case: device needs no address. */ | |
1112 | lladdr = neigh->ha; | |
1113 | } else if (lladdr) { | |
1114 | /* The second case: if something is already cached | |
1115 | and a new address is proposed: | |
1116 | - compare new & old | |
1117 | - if they are different, check override flag | |
1118 | */ | |
4ec93edb | 1119 | if ((old & NUD_VALID) && |
1da177e4 LT |
1120 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1121 | lladdr = neigh->ha; | |
1122 | } else { | |
1123 | /* No address is supplied; if we know something, | |
1124 | use it, otherwise discard the request. | |
1125 | */ | |
1126 | err = -EINVAL; | |
1127 | if (!(old & NUD_VALID)) | |
1128 | goto out; | |
1129 | lladdr = neigh->ha; | |
1130 | } | |
1131 | ||
1132 | if (new & NUD_CONNECTED) | |
1133 | neigh->confirmed = jiffies; | |
1134 | neigh->updated = jiffies; | |
1135 | ||
1136 | /* If entry was valid and address is not changed, | |
1137 | do not change entry state, if new one is STALE. | |
1138 | */ | |
1139 | err = 0; | |
1140 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1141 | if (old & NUD_VALID) { | |
1142 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1143 | update_isrouter = 0; | |
1144 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1145 | (old & NUD_CONNECTED)) { | |
1146 | lladdr = neigh->ha; | |
1147 | new = NUD_STALE; | |
1148 | } else | |
1149 | goto out; | |
1150 | } else { | |
1151 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1152 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1153 | (old & NUD_CONNECTED)) | |
1154 | ) | |
1155 | new = old; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | if (new != old) { | |
1160 | neigh_del_timer(neigh); | |
a43d8994 | 1161 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1162 | neigh_add_timer(neigh, (jiffies + |
1163 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1164 | neigh->parms->reachable_time : |
1165 | 0))); | |
1da177e4 | 1166 | neigh->nud_state = new; |
53385d2d | 1167 | notify = 1; |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1171 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1172 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1173 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1174 | neigh_update_hhs(neigh); |
1175 | if (!(new & NUD_CONNECTED)) | |
1176 | neigh->confirmed = jiffies - | |
1f9248e5 | 1177 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1178 | notify = 1; |
1da177e4 LT |
1179 | } |
1180 | if (new == old) | |
1181 | goto out; | |
1182 | if (new & NUD_CONNECTED) | |
1183 | neigh_connect(neigh); | |
1184 | else | |
1185 | neigh_suspect(neigh); | |
1186 | if (!(old & NUD_VALID)) { | |
1187 | struct sk_buff *skb; | |
1188 | ||
1189 | /* Again: avoid dead loop if something went wrong */ | |
1190 | ||
1191 | while (neigh->nud_state & NUD_VALID && | |
1192 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1193 | struct dst_entry *dst = skb_dst(skb); |
1194 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1195 | write_unlock_bh(&neigh->lock); |
e049f288 | 1196 | |
1197 | rcu_read_lock(); | |
13a43d94 DM |
1198 | |
1199 | /* Why not just use 'neigh' as-is? The problem is that | |
1200 | * things such as shaper, eql, and sch_teql can end up | |
1201 | * using alternative, different, neigh objects to output | |
1202 | * the packet in the output path. So what we need to do | |
1203 | * here is re-lookup the top-level neigh in the path so | |
1204 | * we can reinject the packet there. | |
1205 | */ | |
1206 | n2 = NULL; | |
1207 | if (dst) { | |
1208 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1209 | if (n2) | |
1210 | n1 = n2; | |
1211 | } | |
8f40b161 | 1212 | n1->output(n1, skb); |
13a43d94 DM |
1213 | if (n2) |
1214 | neigh_release(n2); | |
e049f288 | 1215 | rcu_read_unlock(); |
1216 | ||
1da177e4 LT |
1217 | write_lock_bh(&neigh->lock); |
1218 | } | |
c9ab4d85 | 1219 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1220 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1221 | } |
1222 | out: | |
1223 | if (update_isrouter) { | |
1224 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1225 | (neigh->flags | NTF_ROUTER) : | |
1226 | (neigh->flags & ~NTF_ROUTER); | |
1227 | } | |
1228 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1229 | |
1230 | if (notify) | |
d961db35 TG |
1231 | neigh_update_notify(neigh); |
1232 | ||
1da177e4 LT |
1233 | return err; |
1234 | } | |
0a204500 | 1235 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1236 | |
7e980569 JB |
1237 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1238 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1239 | */ | |
1240 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1241 | { | |
1242 | neigh->updated = jiffies; | |
1243 | if (!(neigh->nud_state & NUD_FAILED)) | |
1244 | return; | |
2176d5d4 DJ |
1245 | neigh->nud_state = NUD_INCOMPLETE; |
1246 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 JB |
1247 | neigh_add_timer(neigh, |
1248 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); | |
1249 | } | |
1250 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1251 | ||
1da177e4 LT |
1252 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1253 | u8 *lladdr, void *saddr, | |
1254 | struct net_device *dev) | |
1255 | { | |
1256 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1257 | lladdr || !dev->addr_len); | |
1258 | if (neigh) | |
4ec93edb | 1259 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1260 | NEIGH_UPDATE_F_OVERRIDE); |
1261 | return neigh; | |
1262 | } | |
0a204500 | 1263 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1264 | |
34d101dd | 1265 | /* called with read_lock_bh(&n->lock); */ |
f6b72b62 | 1266 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst) |
1da177e4 | 1267 | { |
1da177e4 | 1268 | struct net_device *dev = dst->dev; |
f6b72b62 DM |
1269 | __be16 prot = dst->ops->protocol; |
1270 | struct hh_cache *hh = &n->hh; | |
0ed8ddf4 ED |
1271 | |
1272 | write_lock_bh(&n->lock); | |
34d101dd | 1273 | |
f6b72b62 DM |
1274 | /* Only one thread can come in here and initialize the |
1275 | * hh_cache entry. | |
1276 | */ | |
b23b5455 DM |
1277 | if (!hh->hh_len) |
1278 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1279 | |
0ed8ddf4 | 1280 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1281 | } |
1282 | ||
1da177e4 LT |
1283 | /* Slow and careful. */ |
1284 | ||
8f40b161 | 1285 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1286 | { |
adf30907 | 1287 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
1288 | int rc = 0; |
1289 | ||
8f40b161 | 1290 | if (!dst) |
1da177e4 LT |
1291 | goto discard; |
1292 | ||
1da177e4 LT |
1293 | if (!neigh_event_send(neigh, skb)) { |
1294 | int err; | |
1295 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1296 | unsigned int seq; |
34d101dd | 1297 | |
f6b72b62 DM |
1298 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
1299 | neigh_hh_init(neigh, dst); | |
34d101dd | 1300 | |
0ed8ddf4 | 1301 | do { |
e1f16503 | 1302 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1303 | seq = read_seqbegin(&neigh->ha_lock); |
1304 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1305 | neigh->ha, NULL, skb->len); | |
1306 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1307 | |
1da177e4 | 1308 | if (err >= 0) |
542d4d68 | 1309 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1310 | else |
1311 | goto out_kfree_skb; | |
1312 | } | |
1313 | out: | |
1314 | return rc; | |
1315 | discard: | |
d5d427cd | 1316 | neigh_dbg(1, "%s: dst=%p neigh=%p\n", __func__, dst, neigh); |
1da177e4 LT |
1317 | out_kfree_skb: |
1318 | rc = -EINVAL; | |
1319 | kfree_skb(skb); | |
1320 | goto out; | |
1321 | } | |
0a204500 | 1322 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1323 | |
1324 | /* As fast as possible without hh cache */ | |
1325 | ||
8f40b161 | 1326 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1327 | { |
1da177e4 | 1328 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1329 | unsigned int seq; |
8f40b161 | 1330 | int err; |
1da177e4 | 1331 | |
0ed8ddf4 | 1332 | do { |
e1f16503 | 1333 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1334 | seq = read_seqbegin(&neigh->ha_lock); |
1335 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1336 | neigh->ha, NULL, skb->len); | |
1337 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1338 | ||
1da177e4 | 1339 | if (err >= 0) |
542d4d68 | 1340 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1341 | else { |
1342 | err = -EINVAL; | |
1343 | kfree_skb(skb); | |
1344 | } | |
1345 | return err; | |
1346 | } | |
0a204500 | 1347 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1348 | |
8f40b161 DM |
1349 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1350 | { | |
1351 | return dev_queue_xmit(skb); | |
1352 | } | |
1353 | EXPORT_SYMBOL(neigh_direct_output); | |
1354 | ||
1da177e4 LT |
1355 | static void neigh_proxy_process(unsigned long arg) |
1356 | { | |
1357 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1358 | long sched_next = 0; | |
1359 | unsigned long now = jiffies; | |
f72051b0 | 1360 | struct sk_buff *skb, *n; |
1da177e4 LT |
1361 | |
1362 | spin_lock(&tbl->proxy_queue.lock); | |
1363 | ||
f72051b0 DM |
1364 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1365 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1366 | |
1da177e4 | 1367 | if (tdif <= 0) { |
f72051b0 | 1368 | struct net_device *dev = skb->dev; |
20e6074e | 1369 | |
f72051b0 | 1370 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1371 | if (tbl->proxy_redo && netif_running(dev)) { |
1372 | rcu_read_lock(); | |
f72051b0 | 1373 | tbl->proxy_redo(skb); |
20e6074e ED |
1374 | rcu_read_unlock(); |
1375 | } else { | |
f72051b0 | 1376 | kfree_skb(skb); |
20e6074e | 1377 | } |
1da177e4 LT |
1378 | |
1379 | dev_put(dev); | |
1380 | } else if (!sched_next || tdif < sched_next) | |
1381 | sched_next = tdif; | |
1382 | } | |
1383 | del_timer(&tbl->proxy_timer); | |
1384 | if (sched_next) | |
1385 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1386 | spin_unlock(&tbl->proxy_queue.lock); | |
1387 | } | |
1388 | ||
1389 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1390 | struct sk_buff *skb) | |
1391 | { | |
1392 | unsigned long now = jiffies; | |
63862b5b AH |
1393 | |
1394 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1395 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1396 | |
1f9248e5 | 1397 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1398 | kfree_skb(skb); |
1399 | return; | |
1400 | } | |
a61bbcf2 PM |
1401 | |
1402 | NEIGH_CB(skb)->sched_next = sched_next; | |
1403 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1404 | |
1405 | spin_lock(&tbl->proxy_queue.lock); | |
1406 | if (del_timer(&tbl->proxy_timer)) { | |
1407 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1408 | sched_next = tbl->proxy_timer.expires; | |
1409 | } | |
adf30907 | 1410 | skb_dst_drop(skb); |
1da177e4 LT |
1411 | dev_hold(skb->dev); |
1412 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1413 | mod_timer(&tbl->proxy_timer, sched_next); | |
1414 | spin_unlock(&tbl->proxy_queue.lock); | |
1415 | } | |
0a204500 | 1416 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1417 | |
97fd5bc7 | 1418 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1419 | struct net *net, int ifindex) |
1420 | { | |
1421 | struct neigh_parms *p; | |
1422 | ||
75fbfd33 | 1423 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1424 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1425 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1426 | return p; |
1427 | } | |
1428 | ||
1429 | return NULL; | |
1430 | } | |
1da177e4 LT |
1431 | |
1432 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1433 | struct neigh_table *tbl) | |
1434 | { | |
cf89d6b2 | 1435 | struct neigh_parms *p; |
00829823 SH |
1436 | struct net *net = dev_net(dev); |
1437 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1438 | |
cf89d6b2 | 1439 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1440 | if (p) { |
1da177e4 LT |
1441 | p->tbl = tbl; |
1442 | atomic_set(&p->refcnt, 1); | |
1da177e4 | 1443 | p->reachable_time = |
1f9248e5 | 1444 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1445 | dev_hold(dev); |
1446 | p->dev = dev; | |
1447 | write_pnet(&p->net, hold_net(net)); | |
1448 | p->sysctl_table = NULL; | |
c7fb64db | 1449 | |
00829823 | 1450 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 VF |
1451 | release_net(net); |
1452 | dev_put(dev); | |
486b51d3 DL |
1453 | kfree(p); |
1454 | return NULL; | |
1da177e4 | 1455 | } |
486b51d3 | 1456 | |
1da177e4 | 1457 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1458 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1459 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1460 | |
1461 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1462 | } |
1463 | return p; | |
1464 | } | |
0a204500 | 1465 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1466 | |
1467 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1468 | { | |
1469 | struct neigh_parms *parms = | |
1470 | container_of(head, struct neigh_parms, rcu_head); | |
1471 | ||
1472 | neigh_parms_put(parms); | |
1473 | } | |
1474 | ||
1475 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1476 | { | |
1da177e4 LT |
1477 | if (!parms || parms == &tbl->parms) |
1478 | return; | |
1479 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1480 | list_del(&parms->list); |
1481 | parms->dead = 1; | |
1da177e4 | 1482 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1483 | if (parms->dev) |
1484 | dev_put(parms->dev); | |
1485 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1486 | } |
0a204500 | 1487 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1488 | |
06f0511d | 1489 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1490 | { |
57da52c1 | 1491 | release_net(neigh_parms_net(parms)); |
1da177e4 LT |
1492 | kfree(parms); |
1493 | } | |
1494 | ||
c2ecba71 PE |
1495 | static struct lock_class_key neigh_table_proxy_queue_class; |
1496 | ||
d7480fd3 WC |
1497 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1498 | ||
1499 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1500 | { |
1501 | unsigned long now = jiffies; | |
1502 | unsigned long phsize; | |
1503 | ||
75fbfd33 ND |
1504 | INIT_LIST_HEAD(&tbl->parms_list); |
1505 | list_add(&tbl->parms.list, &tbl->parms_list); | |
e42ea986 | 1506 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1507 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1508 | tbl->parms.reachable_time = |
1f9248e5 | 1509 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1510 | |
1da177e4 LT |
1511 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1512 | if (!tbl->stats) | |
1513 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1514 | |
1da177e4 | 1515 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1516 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1517 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1518 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1519 | #endif |
1520 | ||
cd089336 | 1521 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1522 | |
1523 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1524 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1525 | |
d6bf7817 | 1526 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1527 | panic("cannot allocate neighbour cache hashes"); |
1528 | ||
08433eff YH |
1529 | if (!tbl->entry_size) |
1530 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1531 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1532 | else | |
1533 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1534 | ||
1da177e4 | 1535 | rwlock_init(&tbl->lock); |
203b42f7 | 1536 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1537 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1538 | tbl->parms.reachable_time); | |
b24b8a24 | 1539 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1540 | skb_queue_head_init_class(&tbl->proxy_queue, |
1541 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1542 | |
1543 | tbl->last_flush = now; | |
1544 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1545 | |
d7480fd3 | 1546 | neigh_tables[index] = tbl; |
1da177e4 | 1547 | } |
0a204500 | 1548 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1549 | |
d7480fd3 | 1550 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1551 | { |
d7480fd3 | 1552 | neigh_tables[index] = NULL; |
1da177e4 | 1553 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1554 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1555 | del_timer_sync(&tbl->proxy_timer); |
1556 | pneigh_queue_purge(&tbl->proxy_queue); | |
1557 | neigh_ifdown(tbl, NULL); | |
1558 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1559 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1560 | |
6193d2be ED |
1561 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1562 | neigh_hash_free_rcu); | |
d6bf7817 | 1563 | tbl->nht = NULL; |
1da177e4 LT |
1564 | |
1565 | kfree(tbl->phash_buckets); | |
1566 | tbl->phash_buckets = NULL; | |
1567 | ||
3f192b5c AD |
1568 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1569 | ||
3fcde74b KK |
1570 | free_percpu(tbl->stats); |
1571 | tbl->stats = NULL; | |
1572 | ||
1da177e4 LT |
1573 | return 0; |
1574 | } | |
0a204500 | 1575 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1576 | |
d7480fd3 WC |
1577 | static struct neigh_table *neigh_find_table(int family) |
1578 | { | |
1579 | struct neigh_table *tbl = NULL; | |
1580 | ||
1581 | switch (family) { | |
1582 | case AF_INET: | |
1583 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1584 | break; | |
1585 | case AF_INET6: | |
1586 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1587 | break; | |
1588 | case AF_DECnet: | |
1589 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1590 | break; | |
1591 | } | |
1592 | ||
1593 | return tbl; | |
1594 | } | |
1595 | ||
661d2967 | 1596 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1597 | { |
3b1e0a65 | 1598 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1599 | struct ndmsg *ndm; |
1600 | struct nlattr *dst_attr; | |
1da177e4 | 1601 | struct neigh_table *tbl; |
d7480fd3 | 1602 | struct neighbour *neigh; |
1da177e4 | 1603 | struct net_device *dev = NULL; |
a14a49d2 | 1604 | int err = -EINVAL; |
1da177e4 | 1605 | |
110b2499 | 1606 | ASSERT_RTNL(); |
a14a49d2 | 1607 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1608 | goto out; |
1609 | ||
a14a49d2 TG |
1610 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1611 | if (dst_attr == NULL) | |
1612 | goto out; | |
1613 | ||
1614 | ndm = nlmsg_data(nlh); | |
1615 | if (ndm->ndm_ifindex) { | |
110b2499 | 1616 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1617 | if (dev == NULL) { |
1618 | err = -ENODEV; | |
1619 | goto out; | |
1620 | } | |
1621 | } | |
1622 | ||
d7480fd3 WC |
1623 | tbl = neigh_find_table(ndm->ndm_family); |
1624 | if (tbl == NULL) | |
1625 | return -EAFNOSUPPORT; | |
1da177e4 | 1626 | |
d7480fd3 WC |
1627 | if (nla_len(dst_attr) < tbl->key_len) |
1628 | goto out; | |
1da177e4 | 1629 | |
d7480fd3 WC |
1630 | if (ndm->ndm_flags & NTF_PROXY) { |
1631 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1632 | goto out; | |
1633 | } | |
1da177e4 | 1634 | |
d7480fd3 WC |
1635 | if (dev == NULL) |
1636 | goto out; | |
a14a49d2 | 1637 | |
d7480fd3 WC |
1638 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1639 | if (neigh == NULL) { | |
1640 | err = -ENOENT; | |
110b2499 | 1641 | goto out; |
1da177e4 | 1642 | } |
d7480fd3 WC |
1643 | |
1644 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1645 | NEIGH_UPDATE_F_OVERRIDE | | |
1646 | NEIGH_UPDATE_F_ADMIN); | |
1647 | neigh_release(neigh); | |
a14a49d2 | 1648 | |
1da177e4 LT |
1649 | out: |
1650 | return err; | |
1651 | } | |
1652 | ||
661d2967 | 1653 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1654 | { |
d7480fd3 | 1655 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
3b1e0a65 | 1656 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1657 | struct ndmsg *ndm; |
1658 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1659 | struct neigh_table *tbl; |
1660 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1661 | struct neighbour *neigh; |
1662 | void *dst, *lladdr; | |
5208debd | 1663 | int err; |
1da177e4 | 1664 | |
110b2499 | 1665 | ASSERT_RTNL(); |
5208debd TG |
1666 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1667 | if (err < 0) | |
1da177e4 LT |
1668 | goto out; |
1669 | ||
5208debd TG |
1670 | err = -EINVAL; |
1671 | if (tb[NDA_DST] == NULL) | |
1672 | goto out; | |
1673 | ||
1674 | ndm = nlmsg_data(nlh); | |
1675 | if (ndm->ndm_ifindex) { | |
110b2499 | 1676 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1677 | if (dev == NULL) { |
1678 | err = -ENODEV; | |
1679 | goto out; | |
1680 | } | |
1681 | ||
1682 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
110b2499 | 1683 | goto out; |
5208debd TG |
1684 | } |
1685 | ||
d7480fd3 WC |
1686 | tbl = neigh_find_table(ndm->ndm_family); |
1687 | if (tbl == NULL) | |
1688 | return -EAFNOSUPPORT; | |
1da177e4 | 1689 | |
d7480fd3 WC |
1690 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1691 | goto out; | |
1692 | dst = nla_data(tb[NDA_DST]); | |
1693 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1694 | |
d7480fd3 WC |
1695 | if (ndm->ndm_flags & NTF_PROXY) { |
1696 | struct pneigh_entry *pn; | |
1697 | ||
1698 | err = -ENOBUFS; | |
1699 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1700 | if (pn) { | |
1701 | pn->flags = ndm->ndm_flags; | |
1702 | err = 0; | |
1703 | } | |
1704 | goto out; | |
1705 | } | |
1da177e4 | 1706 | |
d7480fd3 WC |
1707 | if (dev == NULL) |
1708 | goto out; | |
62dd9318 | 1709 | |
d7480fd3 WC |
1710 | neigh = neigh_lookup(tbl, dst, dev); |
1711 | if (neigh == NULL) { | |
1712 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1713 | err = -ENOENT; | |
110b2499 | 1714 | goto out; |
1da177e4 LT |
1715 | } |
1716 | ||
d7480fd3 WC |
1717 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1718 | if (IS_ERR(neigh)) { | |
1719 | err = PTR_ERR(neigh); | |
1720 | goto out; | |
1721 | } | |
1722 | } else { | |
1723 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1724 | err = -EEXIST; | |
1725 | neigh_release(neigh); | |
110b2499 | 1726 | goto out; |
5208debd | 1727 | } |
1da177e4 | 1728 | |
d7480fd3 WC |
1729 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1730 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1da177e4 LT |
1731 | } |
1732 | ||
d7480fd3 WC |
1733 | if (ndm->ndm_flags & NTF_USE) { |
1734 | neigh_event_send(neigh, NULL); | |
1735 | err = 0; | |
1736 | } else | |
1737 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
1738 | neigh_release(neigh); | |
1739 | ||
1da177e4 LT |
1740 | out: |
1741 | return err; | |
1742 | } | |
1743 | ||
c7fb64db TG |
1744 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1745 | { | |
ca860fb3 TG |
1746 | struct nlattr *nest; |
1747 | ||
1748 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1749 | if (nest == NULL) | |
1750 | return -ENOBUFS; | |
c7fb64db | 1751 | |
9a6308d7 DM |
1752 | if ((parms->dev && |
1753 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
1754 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || | |
1f9248e5 JP |
1755 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1756 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1757 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1758 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1759 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1760 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1761 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
1762 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
1763 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
1764 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
1765 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
9a6308d7 DM |
1766 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time) || |
1767 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, | |
1f9248e5 JP |
1768 | NEIGH_VAR(parms, BASE_REACHABLE_TIME)) || |
1769 | nla_put_msecs(skb, NDTPA_GC_STALETIME, | |
1770 | NEIGH_VAR(parms, GC_STALETIME)) || | |
9a6308d7 | 1771 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
1f9248e5 JP |
1772 | NEIGH_VAR(parms, DELAY_PROBE_TIME)) || |
1773 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, | |
1774 | NEIGH_VAR(parms, RETRANS_TIME)) || | |
1775 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, | |
1776 | NEIGH_VAR(parms, ANYCAST_DELAY)) || | |
1777 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, | |
1778 | NEIGH_VAR(parms, PROXY_DELAY)) || | |
1779 | nla_put_msecs(skb, NDTPA_LOCKTIME, | |
1780 | NEIGH_VAR(parms, LOCKTIME))) | |
9a6308d7 | 1781 | goto nla_put_failure; |
ca860fb3 | 1782 | return nla_nest_end(skb, nest); |
c7fb64db | 1783 | |
ca860fb3 | 1784 | nla_put_failure: |
bc3ed28c TG |
1785 | nla_nest_cancel(skb, nest); |
1786 | return -EMSGSIZE; | |
c7fb64db TG |
1787 | } |
1788 | ||
ca860fb3 TG |
1789 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1790 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1791 | { |
1792 | struct nlmsghdr *nlh; | |
1793 | struct ndtmsg *ndtmsg; | |
1794 | ||
ca860fb3 TG |
1795 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1796 | if (nlh == NULL) | |
26932566 | 1797 | return -EMSGSIZE; |
c7fb64db | 1798 | |
ca860fb3 | 1799 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1800 | |
1801 | read_lock_bh(&tbl->lock); | |
1802 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1803 | ndtmsg->ndtm_pad1 = 0; |
1804 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1805 | |
9a6308d7 DM |
1806 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
1807 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval) || | |
1808 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || | |
1809 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
1810 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
1811 | goto nla_put_failure; | |
c7fb64db TG |
1812 | { |
1813 | unsigned long now = jiffies; | |
1814 | unsigned int flush_delta = now - tbl->last_flush; | |
1815 | unsigned int rand_delta = now - tbl->last_rand; | |
d6bf7817 | 1816 | struct neigh_hash_table *nht; |
c7fb64db TG |
1817 | struct ndt_config ndc = { |
1818 | .ndtc_key_len = tbl->key_len, | |
1819 | .ndtc_entry_size = tbl->entry_size, | |
1820 | .ndtc_entries = atomic_read(&tbl->entries), | |
1821 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1822 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
1823 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
1824 | }; | |
1825 | ||
d6bf7817 ED |
1826 | rcu_read_lock_bh(); |
1827 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 1828 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 1829 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
1830 | rcu_read_unlock_bh(); |
1831 | ||
9a6308d7 DM |
1832 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
1833 | goto nla_put_failure; | |
c7fb64db TG |
1834 | } |
1835 | ||
1836 | { | |
1837 | int cpu; | |
1838 | struct ndt_stats ndst; | |
1839 | ||
1840 | memset(&ndst, 0, sizeof(ndst)); | |
1841 | ||
6f912042 | 1842 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1843 | struct neigh_statistics *st; |
1844 | ||
c7fb64db TG |
1845 | st = per_cpu_ptr(tbl->stats, cpu); |
1846 | ndst.ndts_allocs += st->allocs; | |
1847 | ndst.ndts_destroys += st->destroys; | |
1848 | ndst.ndts_hash_grows += st->hash_grows; | |
1849 | ndst.ndts_res_failed += st->res_failed; | |
1850 | ndst.ndts_lookups += st->lookups; | |
1851 | ndst.ndts_hits += st->hits; | |
1852 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1853 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1854 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1855 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1856 | } | |
1857 | ||
9a6308d7 DM |
1858 | if (nla_put(skb, NDTA_STATS, sizeof(ndst), &ndst)) |
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 }, | |
1925 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1926 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1927 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1928 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1929 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1930 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1931 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1932 | }; | |
1933 | ||
661d2967 | 1934 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
c7fb64db | 1935 | { |
3b1e0a65 | 1936 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1937 | struct neigh_table *tbl; |
6b3f8674 TG |
1938 | struct ndtmsg *ndtmsg; |
1939 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
1940 | bool found = false; |
1941 | int err, tidx; | |
c7fb64db | 1942 | |
6b3f8674 TG |
1943 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1944 | nl_neightbl_policy); | |
1945 | if (err < 0) | |
1946 | goto errout; | |
c7fb64db | 1947 | |
6b3f8674 TG |
1948 | if (tb[NDTA_NAME] == NULL) { |
1949 | err = -EINVAL; | |
1950 | goto errout; | |
1951 | } | |
1952 | ||
1953 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
1954 | |
1955 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
1956 | tbl = neigh_tables[tidx]; | |
1957 | if (!tbl) | |
1958 | continue; | |
c7fb64db TG |
1959 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
1960 | continue; | |
d7480fd3 WC |
1961 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
1962 | found = true; | |
c7fb64db | 1963 | break; |
d7480fd3 | 1964 | } |
c7fb64db TG |
1965 | } |
1966 | ||
d7480fd3 WC |
1967 | if (!found) |
1968 | return -ENOENT; | |
c7fb64db | 1969 | |
4ec93edb | 1970 | /* |
c7fb64db TG |
1971 | * We acquire tbl->lock to be nice to the periodic timers and |
1972 | * make sure they always see a consistent set of values. | |
1973 | */ | |
1974 | write_lock_bh(&tbl->lock); | |
1975 | ||
6b3f8674 TG |
1976 | if (tb[NDTA_PARMS]) { |
1977 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1978 | struct neigh_parms *p; |
6b3f8674 | 1979 | int i, ifindex = 0; |
c7fb64db | 1980 | |
6b3f8674 TG |
1981 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1982 | nl_ntbl_parm_policy); | |
1983 | if (err < 0) | |
1984 | goto errout_tbl_lock; | |
c7fb64db | 1985 | |
6b3f8674 TG |
1986 | if (tbp[NDTPA_IFINDEX]) |
1987 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1988 | |
97fd5bc7 | 1989 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
1990 | if (p == NULL) { |
1991 | err = -ENOENT; | |
6b3f8674 | 1992 | goto errout_tbl_lock; |
c7fb64db | 1993 | } |
c7fb64db | 1994 | |
6b3f8674 TG |
1995 | for (i = 1; i <= NDTPA_MAX; i++) { |
1996 | if (tbp[i] == NULL) | |
1997 | continue; | |
c7fb64db | 1998 | |
6b3f8674 TG |
1999 | switch (i) { |
2000 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2001 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2002 | nla_get_u32(tbp[i]) * | |
2003 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2004 | break; |
2005 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2006 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2007 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2008 | break; |
2009 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2010 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2011 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2012 | break; |
2013 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2014 | NEIGH_VAR_SET(p, APP_PROBES, |
2015 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2016 | break; |
2017 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2018 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2019 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2020 | break; |
2021 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2022 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2023 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2024 | break; |
2025 | case NDTPA_BASE_REACHABLE_TIME: | |
1f9248e5 JP |
2026 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2027 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2028 | /* update reachable_time as well, otherwise, the change will |
2029 | * only be effective after the next time neigh_periodic_work | |
2030 | * decides to recompute it (can be multiple minutes) | |
2031 | */ | |
2032 | p->reachable_time = | |
2033 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2034 | break; |
2035 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2036 | NEIGH_VAR_SET(p, GC_STALETIME, |
2037 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2038 | break; |
2039 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2040 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2041 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2042 | break; |
2043 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2044 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2045 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2046 | break; |
2047 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2048 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2049 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2050 | break; |
2051 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2052 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2053 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2054 | break; |
2055 | case NDTPA_LOCKTIME: | |
3977458c JP |
2056 | NEIGH_VAR_SET(p, LOCKTIME, |
2057 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2058 | break; |
2059 | } | |
2060 | } | |
2061 | } | |
c7fb64db | 2062 | |
dc25c676 G |
2063 | err = -ENOENT; |
2064 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2065 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2066 | !net_eq(net, &init_net)) | |
2067 | goto errout_tbl_lock; | |
2068 | ||
6b3f8674 TG |
2069 | if (tb[NDTA_THRESH1]) |
2070 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2071 | |
6b3f8674 TG |
2072 | if (tb[NDTA_THRESH2]) |
2073 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2074 | |
6b3f8674 TG |
2075 | if (tb[NDTA_THRESH3]) |
2076 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2077 | |
6b3f8674 TG |
2078 | if (tb[NDTA_GC_INTERVAL]) |
2079 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2080 | |
2081 | err = 0; | |
2082 | ||
6b3f8674 | 2083 | errout_tbl_lock: |
c7fb64db | 2084 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2085 | errout: |
c7fb64db TG |
2086 | return err; |
2087 | } | |
2088 | ||
c8822a4e | 2089 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2090 | { |
3b1e0a65 | 2091 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2092 | int family, tidx, nidx = 0; |
2093 | int tbl_skip = cb->args[0]; | |
2094 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2095 | struct neigh_table *tbl; |
2096 | ||
ca860fb3 | 2097 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db | 2098 | |
d7480fd3 | 2099 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2100 | struct neigh_parms *p; |
2101 | ||
d7480fd3 WC |
2102 | tbl = neigh_tables[tidx]; |
2103 | if (!tbl) | |
2104 | continue; | |
2105 | ||
ca860fb3 | 2106 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2107 | continue; |
2108 | ||
15e47304 | 2109 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
ca860fb3 | 2110 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2111 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2112 | break; |
2113 | ||
75fbfd33 ND |
2114 | nidx = 0; |
2115 | p = list_next_entry(&tbl->parms, list); | |
2116 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2117 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2118 | continue; |
2119 | ||
efc683fc GK |
2120 | if (nidx < neigh_skip) |
2121 | goto next; | |
c7fb64db | 2122 | |
ca860fb3 | 2123 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2124 | NETLINK_CB(cb->skb).portid, |
ca860fb3 TG |
2125 | cb->nlh->nlmsg_seq, |
2126 | RTM_NEWNEIGHTBL, | |
7b46a644 | 2127 | NLM_F_MULTI) < 0) |
c7fb64db | 2128 | goto out; |
efc683fc GK |
2129 | next: |
2130 | nidx++; | |
c7fb64db TG |
2131 | } |
2132 | ||
ca860fb3 | 2133 | neigh_skip = 0; |
c7fb64db TG |
2134 | } |
2135 | out: | |
ca860fb3 TG |
2136 | cb->args[0] = tidx; |
2137 | cb->args[1] = nidx; | |
c7fb64db TG |
2138 | |
2139 | return skb->len; | |
2140 | } | |
1da177e4 | 2141 | |
8b8aec50 TG |
2142 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2143 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2144 | { |
2145 | unsigned long now = jiffies; | |
1da177e4 | 2146 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2147 | struct nlmsghdr *nlh; |
2148 | struct ndmsg *ndm; | |
2149 | ||
2150 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2151 | if (nlh == NULL) | |
26932566 | 2152 | return -EMSGSIZE; |
1da177e4 | 2153 | |
8b8aec50 TG |
2154 | ndm = nlmsg_data(nlh); |
2155 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2156 | ndm->ndm_pad1 = 0; |
2157 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2158 | ndm->ndm_flags = neigh->flags; |
2159 | ndm->ndm_type = neigh->type; | |
2160 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2161 | |
9a6308d7 DM |
2162 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2163 | goto nla_put_failure; | |
8b8aec50 TG |
2164 | |
2165 | read_lock_bh(&neigh->lock); | |
2166 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2167 | if (neigh->nud_state & NUD_VALID) { |
2168 | char haddr[MAX_ADDR_LEN]; | |
2169 | ||
2170 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2171 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2172 | read_unlock_bh(&neigh->lock); | |
2173 | goto nla_put_failure; | |
2174 | } | |
8b8aec50 TG |
2175 | } |
2176 | ||
b9f5f52c SH |
2177 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2178 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2179 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2180 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2181 | read_unlock_bh(&neigh->lock); | |
2182 | ||
9a6308d7 DM |
2183 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2184 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2185 | goto nla_put_failure; | |
8b8aec50 | 2186 | |
053c095a JB |
2187 | nlmsg_end(skb, nlh); |
2188 | return 0; | |
8b8aec50 TG |
2189 | |
2190 | nla_put_failure: | |
26932566 PM |
2191 | nlmsg_cancel(skb, nlh); |
2192 | return -EMSGSIZE; | |
1da177e4 LT |
2193 | } |
2194 | ||
84920c14 TZ |
2195 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2196 | u32 pid, u32 seq, int type, unsigned int flags, | |
2197 | struct neigh_table *tbl) | |
2198 | { | |
2199 | struct nlmsghdr *nlh; | |
2200 | struct ndmsg *ndm; | |
2201 | ||
2202 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2203 | if (nlh == NULL) | |
2204 | return -EMSGSIZE; | |
2205 | ||
2206 | ndm = nlmsg_data(nlh); | |
2207 | ndm->ndm_family = tbl->family; | |
2208 | ndm->ndm_pad1 = 0; | |
2209 | ndm->ndm_pad2 = 0; | |
2210 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2211 | ndm->ndm_type = RTN_UNICAST; |
84920c14 TZ |
2212 | ndm->ndm_ifindex = pn->dev->ifindex; |
2213 | ndm->ndm_state = NUD_NONE; | |
2214 | ||
9a6308d7 DM |
2215 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2216 | goto nla_put_failure; | |
84920c14 | 2217 | |
053c095a JB |
2218 | nlmsg_end(skb, nlh); |
2219 | return 0; | |
84920c14 TZ |
2220 | |
2221 | nla_put_failure: | |
2222 | nlmsg_cancel(skb, nlh); | |
2223 | return -EMSGSIZE; | |
2224 | } | |
2225 | ||
d961db35 TG |
2226 | static void neigh_update_notify(struct neighbour *neigh) |
2227 | { | |
2228 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2229 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2230 | } | |
1da177e4 LT |
2231 | |
2232 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2233 | struct netlink_callback *cb) | |
2234 | { | |
767e97e1 | 2235 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2236 | struct neighbour *n; |
2237 | int rc, h, s_h = cb->args[1]; | |
2238 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2239 | struct neigh_hash_table *nht; |
1da177e4 | 2240 | |
d6bf7817 ED |
2241 | rcu_read_lock_bh(); |
2242 | nht = rcu_dereference_bh(tbl->nht); | |
2243 | ||
4bd6683b | 2244 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2245 | if (h > s_h) |
2246 | s_idx = 0; | |
767e97e1 ED |
2247 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2248 | n != NULL; | |
2249 | n = rcu_dereference_bh(n->next)) { | |
09ad9bc7 | 2250 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2251 | continue; |
efc683fc GK |
2252 | if (idx < s_idx) |
2253 | goto next; | |
15e47304 | 2254 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2255 | cb->nlh->nlmsg_seq, |
b6544c0b | 2256 | RTM_NEWNEIGH, |
7b46a644 | 2257 | NLM_F_MULTI) < 0) { |
1da177e4 LT |
2258 | rc = -1; |
2259 | goto out; | |
2260 | } | |
767e97e1 | 2261 | next: |
efc683fc | 2262 | idx++; |
1da177e4 | 2263 | } |
1da177e4 LT |
2264 | } |
2265 | rc = skb->len; | |
2266 | out: | |
d6bf7817 | 2267 | rcu_read_unlock_bh(); |
1da177e4 LT |
2268 | cb->args[1] = h; |
2269 | cb->args[2] = idx; | |
2270 | return rc; | |
2271 | } | |
2272 | ||
84920c14 TZ |
2273 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2274 | struct netlink_callback *cb) | |
2275 | { | |
2276 | struct pneigh_entry *n; | |
2277 | struct net *net = sock_net(skb->sk); | |
2278 | int rc, h, s_h = cb->args[3]; | |
2279 | int idx, s_idx = idx = cb->args[4]; | |
2280 | ||
2281 | read_lock_bh(&tbl->lock); | |
2282 | ||
4bd6683b | 2283 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2284 | if (h > s_h) |
2285 | s_idx = 0; | |
2286 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
2287 | if (dev_net(n->dev) != net) | |
2288 | continue; | |
2289 | if (idx < s_idx) | |
2290 | goto next; | |
15e47304 | 2291 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 TZ |
2292 | cb->nlh->nlmsg_seq, |
2293 | RTM_NEWNEIGH, | |
7b46a644 | 2294 | NLM_F_MULTI, tbl) < 0) { |
84920c14 TZ |
2295 | read_unlock_bh(&tbl->lock); |
2296 | rc = -1; | |
2297 | goto out; | |
2298 | } | |
2299 | next: | |
2300 | idx++; | |
2301 | } | |
2302 | } | |
2303 | ||
2304 | read_unlock_bh(&tbl->lock); | |
2305 | rc = skb->len; | |
2306 | out: | |
2307 | cb->args[3] = h; | |
2308 | cb->args[4] = idx; | |
2309 | return rc; | |
2310 | ||
2311 | } | |
2312 | ||
c8822a4e | 2313 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2314 | { |
2315 | struct neigh_table *tbl; | |
2316 | int t, family, s_t; | |
84920c14 | 2317 | int proxy = 0; |
4bd6683b | 2318 | int err; |
1da177e4 | 2319 | |
8b8aec50 | 2320 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
84920c14 TZ |
2321 | |
2322 | /* check for full ndmsg structure presence, family member is | |
2323 | * the same for both structures | |
2324 | */ | |
2325 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && | |
2326 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) | |
2327 | proxy = 1; | |
2328 | ||
1da177e4 LT |
2329 | s_t = cb->args[0]; |
2330 | ||
d7480fd3 WC |
2331 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2332 | tbl = neigh_tables[t]; | |
2333 | ||
2334 | if (!tbl) | |
2335 | continue; | |
1da177e4 LT |
2336 | if (t < s_t || (family && tbl->family != family)) |
2337 | continue; | |
2338 | if (t > s_t) | |
2339 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2340 | sizeof(cb->args[0])); | |
84920c14 TZ |
2341 | if (proxy) |
2342 | err = pneigh_dump_table(tbl, skb, cb); | |
2343 | else | |
2344 | err = neigh_dump_table(tbl, skb, cb); | |
4bd6683b ED |
2345 | if (err < 0) |
2346 | break; | |
1da177e4 | 2347 | } |
1da177e4 LT |
2348 | |
2349 | cb->args[0] = t; | |
2350 | return skb->len; | |
2351 | } | |
2352 | ||
2353 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2354 | { | |
2355 | int chain; | |
d6bf7817 | 2356 | struct neigh_hash_table *nht; |
1da177e4 | 2357 | |
d6bf7817 ED |
2358 | rcu_read_lock_bh(); |
2359 | nht = rcu_dereference_bh(tbl->nht); | |
2360 | ||
767e97e1 | 2361 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2362 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2363 | struct neighbour *n; |
2364 | ||
767e97e1 ED |
2365 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2366 | n != NULL; | |
2367 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2368 | cb(n, cookie); |
2369 | } | |
d6bf7817 ED |
2370 | read_unlock(&tbl->lock); |
2371 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2372 | } |
2373 | EXPORT_SYMBOL(neigh_for_each); | |
2374 | ||
2375 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2376 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2377 | int (*cb)(struct neighbour *)) | |
2378 | { | |
2379 | int chain; | |
d6bf7817 | 2380 | struct neigh_hash_table *nht; |
1da177e4 | 2381 | |
d6bf7817 ED |
2382 | nht = rcu_dereference_protected(tbl->nht, |
2383 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2384 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2385 | struct neighbour *n; |
2386 | struct neighbour __rcu **np; | |
1da177e4 | 2387 | |
d6bf7817 | 2388 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2389 | while ((n = rcu_dereference_protected(*np, |
2390 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2391 | int release; |
2392 | ||
2393 | write_lock(&n->lock); | |
2394 | release = cb(n); | |
2395 | if (release) { | |
767e97e1 ED |
2396 | rcu_assign_pointer(*np, |
2397 | rcu_dereference_protected(n->next, | |
2398 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
2399 | n->dead = 1; |
2400 | } else | |
2401 | np = &n->next; | |
2402 | write_unlock(&n->lock); | |
4f494554 TG |
2403 | if (release) |
2404 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2405 | } |
2406 | } | |
2407 | } | |
2408 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2409 | ||
2410 | #ifdef CONFIG_PROC_FS | |
2411 | ||
2412 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2413 | { | |
2414 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2415 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2416 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2417 | struct neighbour *n = NULL; |
2418 | int bucket = state->bucket; | |
2419 | ||
2420 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 2421 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 2422 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
2423 | |
2424 | while (n) { | |
878628fb | 2425 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2426 | goto next; |
1da177e4 LT |
2427 | if (state->neigh_sub_iter) { |
2428 | loff_t fakep = 0; | |
2429 | void *v; | |
2430 | ||
2431 | v = state->neigh_sub_iter(state, n, &fakep); | |
2432 | if (!v) | |
2433 | goto next; | |
2434 | } | |
2435 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2436 | break; | |
2437 | if (n->nud_state & ~NUD_NOARP) | |
2438 | break; | |
767e97e1 ED |
2439 | next: |
2440 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2441 | } |
2442 | ||
2443 | if (n) | |
2444 | break; | |
2445 | } | |
2446 | state->bucket = bucket; | |
2447 | ||
2448 | return n; | |
2449 | } | |
2450 | ||
2451 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2452 | struct neighbour *n, | |
2453 | loff_t *pos) | |
2454 | { | |
2455 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2456 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2457 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2458 | |
2459 | if (state->neigh_sub_iter) { | |
2460 | void *v = state->neigh_sub_iter(state, n, pos); | |
2461 | if (v) | |
2462 | return n; | |
2463 | } | |
767e97e1 | 2464 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
2465 | |
2466 | while (1) { | |
2467 | while (n) { | |
878628fb | 2468 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2469 | goto next; |
1da177e4 LT |
2470 | if (state->neigh_sub_iter) { |
2471 | void *v = state->neigh_sub_iter(state, n, pos); | |
2472 | if (v) | |
2473 | return n; | |
2474 | goto next; | |
2475 | } | |
2476 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2477 | break; | |
2478 | ||
2479 | if (n->nud_state & ~NUD_NOARP) | |
2480 | break; | |
767e97e1 ED |
2481 | next: |
2482 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2483 | } |
2484 | ||
2485 | if (n) | |
2486 | break; | |
2487 | ||
cd089336 | 2488 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
2489 | break; |
2490 | ||
767e97e1 | 2491 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
2492 | } |
2493 | ||
2494 | if (n && pos) | |
2495 | --(*pos); | |
2496 | return n; | |
2497 | } | |
2498 | ||
2499 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2500 | { | |
2501 | struct neighbour *n = neigh_get_first(seq); | |
2502 | ||
2503 | if (n) { | |
745e2031 | 2504 | --(*pos); |
1da177e4 LT |
2505 | while (*pos) { |
2506 | n = neigh_get_next(seq, n, pos); | |
2507 | if (!n) | |
2508 | break; | |
2509 | } | |
2510 | } | |
2511 | return *pos ? NULL : n; | |
2512 | } | |
2513 | ||
2514 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2515 | { | |
2516 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2517 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2518 | struct neigh_table *tbl = state->tbl; |
2519 | struct pneigh_entry *pn = NULL; | |
2520 | int bucket = state->bucket; | |
2521 | ||
2522 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2523 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2524 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2525 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2526 | pn = pn->next; |
1da177e4 LT |
2527 | if (pn) |
2528 | break; | |
2529 | } | |
2530 | state->bucket = bucket; | |
2531 | ||
2532 | return pn; | |
2533 | } | |
2534 | ||
2535 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2536 | struct pneigh_entry *pn, | |
2537 | loff_t *pos) | |
2538 | { | |
2539 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2540 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2541 | struct neigh_table *tbl = state->tbl; |
2542 | ||
df07a94c JBD |
2543 | do { |
2544 | pn = pn->next; | |
2545 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
2546 | ||
1da177e4 LT |
2547 | while (!pn) { |
2548 | if (++state->bucket > PNEIGH_HASHMASK) | |
2549 | break; | |
2550 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2551 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2552 | pn = pn->next; |
1da177e4 LT |
2553 | if (pn) |
2554 | break; | |
2555 | } | |
2556 | ||
2557 | if (pn && pos) | |
2558 | --(*pos); | |
2559 | ||
2560 | return pn; | |
2561 | } | |
2562 | ||
2563 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2564 | { | |
2565 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2566 | ||
2567 | if (pn) { | |
745e2031 | 2568 | --(*pos); |
1da177e4 LT |
2569 | while (*pos) { |
2570 | pn = pneigh_get_next(seq, pn, pos); | |
2571 | if (!pn) | |
2572 | break; | |
2573 | } | |
2574 | } | |
2575 | return *pos ? NULL : pn; | |
2576 | } | |
2577 | ||
2578 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2579 | { | |
2580 | struct neigh_seq_state *state = seq->private; | |
2581 | void *rc; | |
745e2031 | 2582 | loff_t idxpos = *pos; |
1da177e4 | 2583 | |
745e2031 | 2584 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2585 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2586 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2587 | |
2588 | return rc; | |
2589 | } | |
2590 | ||
2591 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
d6bf7817 | 2592 | __acquires(rcu_bh) |
1da177e4 LT |
2593 | { |
2594 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2595 | |
2596 | state->tbl = tbl; | |
2597 | state->bucket = 0; | |
2598 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2599 | ||
d6bf7817 ED |
2600 | rcu_read_lock_bh(); |
2601 | state->nht = rcu_dereference_bh(tbl->nht); | |
767e97e1 | 2602 | |
745e2031 | 2603 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2604 | } |
2605 | EXPORT_SYMBOL(neigh_seq_start); | |
2606 | ||
2607 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2608 | { | |
2609 | struct neigh_seq_state *state; | |
2610 | void *rc; | |
2611 | ||
2612 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2613 | rc = neigh_get_first(seq); |
1da177e4 LT |
2614 | goto out; |
2615 | } | |
2616 | ||
2617 | state = seq->private; | |
2618 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2619 | rc = neigh_get_next(seq, v, NULL); | |
2620 | if (rc) | |
2621 | goto out; | |
2622 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2623 | rc = pneigh_get_first(seq); | |
2624 | } else { | |
2625 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2626 | rc = pneigh_get_next(seq, v, NULL); | |
2627 | } | |
2628 | out: | |
2629 | ++(*pos); | |
2630 | return rc; | |
2631 | } | |
2632 | EXPORT_SYMBOL(neigh_seq_next); | |
2633 | ||
2634 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
d6bf7817 | 2635 | __releases(rcu_bh) |
1da177e4 | 2636 | { |
d6bf7817 | 2637 | rcu_read_unlock_bh(); |
1da177e4 LT |
2638 | } |
2639 | EXPORT_SYMBOL(neigh_seq_stop); | |
2640 | ||
2641 | /* statistics via seq_file */ | |
2642 | ||
2643 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2644 | { | |
81c1ebfc | 2645 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2646 | int cpu; |
2647 | ||
2648 | if (*pos == 0) | |
2649 | return SEQ_START_TOKEN; | |
4ec93edb | 2650 | |
0f23174a | 2651 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2652 | if (!cpu_possible(cpu)) |
2653 | continue; | |
2654 | *pos = cpu+1; | |
2655 | return per_cpu_ptr(tbl->stats, cpu); | |
2656 | } | |
2657 | return NULL; | |
2658 | } | |
2659 | ||
2660 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2661 | { | |
81c1ebfc | 2662 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2663 | int cpu; |
2664 | ||
0f23174a | 2665 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2666 | if (!cpu_possible(cpu)) |
2667 | continue; | |
2668 | *pos = cpu+1; | |
2669 | return per_cpu_ptr(tbl->stats, cpu); | |
2670 | } | |
2671 | return NULL; | |
2672 | } | |
2673 | ||
2674 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2675 | { | |
2676 | ||
2677 | } | |
2678 | ||
2679 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2680 | { | |
81c1ebfc | 2681 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2682 | struct neigh_statistics *st = v; |
2683 | ||
2684 | if (v == SEQ_START_TOKEN) { | |
9a6d276e | 2685 | 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\n"); |
1da177e4 LT |
2686 | return 0; |
2687 | } | |
2688 | ||
2689 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
9a6d276e | 2690 | "%08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2691 | atomic_read(&tbl->entries), |
2692 | ||
2693 | st->allocs, | |
2694 | st->destroys, | |
2695 | st->hash_grows, | |
2696 | ||
2697 | st->lookups, | |
2698 | st->hits, | |
2699 | ||
2700 | st->res_failed, | |
2701 | ||
2702 | st->rcv_probes_mcast, | |
2703 | st->rcv_probes_ucast, | |
2704 | ||
2705 | st->periodic_gc_runs, | |
9a6d276e NH |
2706 | st->forced_gc_runs, |
2707 | st->unres_discards | |
1da177e4 LT |
2708 | ); |
2709 | ||
2710 | return 0; | |
2711 | } | |
2712 | ||
f690808e | 2713 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2714 | .start = neigh_stat_seq_start, |
2715 | .next = neigh_stat_seq_next, | |
2716 | .stop = neigh_stat_seq_stop, | |
2717 | .show = neigh_stat_seq_show, | |
2718 | }; | |
2719 | ||
2720 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2721 | { | |
2722 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2723 | ||
2724 | if (!ret) { | |
2725 | struct seq_file *sf = file->private_data; | |
d9dda78b | 2726 | sf->private = PDE_DATA(inode); |
1da177e4 LT |
2727 | } |
2728 | return ret; | |
2729 | }; | |
2730 | ||
9a32144e | 2731 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2732 | .owner = THIS_MODULE, |
2733 | .open = neigh_stat_seq_open, | |
2734 | .read = seq_read, | |
2735 | .llseek = seq_lseek, | |
2736 | .release = seq_release, | |
2737 | }; | |
2738 | ||
2739 | #endif /* CONFIG_PROC_FS */ | |
2740 | ||
339bf98f TG |
2741 | static inline size_t neigh_nlmsg_size(void) |
2742 | { | |
2743 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2744 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2745 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2746 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2747 | + nla_total_size(4); /* NDA_PROBES */ | |
2748 | } | |
2749 | ||
b8673311 | 2750 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2751 | { |
c346dca1 | 2752 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2753 | struct sk_buff *skb; |
b8673311 | 2754 | int err = -ENOBUFS; |
1da177e4 | 2755 | |
339bf98f | 2756 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2757 | if (skb == NULL) |
b8673311 | 2758 | goto errout; |
1da177e4 | 2759 | |
b8673311 | 2760 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2761 | if (err < 0) { |
2762 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2763 | WARN_ON(err == -EMSGSIZE); | |
2764 | kfree_skb(skb); | |
2765 | goto errout; | |
2766 | } | |
1ce85fe4 PNA |
2767 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2768 | return; | |
b8673311 TG |
2769 | errout: |
2770 | if (err < 0) | |
426b5303 | 2771 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2772 | } |
2773 | ||
b8673311 | 2774 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2775 | { |
b8673311 TG |
2776 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2777 | } | |
0a204500 | 2778 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2779 | |
2780 | #ifdef CONFIG_SYSCTL | |
b93196dc | 2781 | static int zero; |
555445cd | 2782 | static int int_max = INT_MAX; |
b93196dc | 2783 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 2784 | |
fe2c6338 JP |
2785 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
2786 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
2787 | { |
2788 | int size, ret; | |
fe2c6338 | 2789 | struct ctl_table tmp = *ctl; |
8b5c171b | 2790 | |
ce46cc64 SW |
2791 | tmp.extra1 = &zero; |
2792 | tmp.extra2 = &unres_qlen_max; | |
8b5c171b | 2793 | tmp.data = &size; |
ce46cc64 SW |
2794 | |
2795 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
2796 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2797 | ||
8b5c171b ED |
2798 | if (write && !ret) |
2799 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
2800 | return ret; | |
2801 | } | |
2802 | ||
1d4c8c29 JP |
2803 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
2804 | int family) | |
2805 | { | |
bba24896 JP |
2806 | switch (family) { |
2807 | case AF_INET: | |
1d4c8c29 | 2808 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
2809 | case AF_INET6: |
2810 | return __in6_dev_nd_parms_get_rcu(dev); | |
2811 | } | |
1d4c8c29 JP |
2812 | return NULL; |
2813 | } | |
2814 | ||
2815 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
2816 | int index) | |
2817 | { | |
2818 | struct net_device *dev; | |
2819 | int family = neigh_parms_family(p); | |
2820 | ||
2821 | rcu_read_lock(); | |
2822 | for_each_netdev_rcu(net, dev) { | |
2823 | struct neigh_parms *dst_p = | |
2824 | neigh_get_dev_parms_rcu(dev, family); | |
2825 | ||
2826 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
2827 | dst_p->data[index] = p->data[index]; | |
2828 | } | |
2829 | rcu_read_unlock(); | |
2830 | } | |
2831 | ||
2832 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
2833 | { | |
2834 | struct net_device *dev = ctl->extra1; | |
2835 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 2836 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
2837 | int index = (int *) ctl->data - p->data; |
2838 | ||
2839 | if (!write) | |
2840 | return; | |
2841 | ||
2842 | set_bit(index, p->data_state); | |
2843 | if (!dev) /* NULL dev means this is default value */ | |
2844 | neigh_copy_dflt_parms(net, p, index); | |
2845 | } | |
2846 | ||
1f9248e5 JP |
2847 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
2848 | void __user *buffer, | |
2849 | size_t *lenp, loff_t *ppos) | |
2850 | { | |
2851 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 2852 | int ret; |
1f9248e5 JP |
2853 | |
2854 | tmp.extra1 = &zero; | |
2855 | tmp.extra2 = &int_max; | |
2856 | ||
1d4c8c29 JP |
2857 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
2858 | neigh_proc_update(ctl, write); | |
2859 | return ret; | |
1f9248e5 JP |
2860 | } |
2861 | ||
cb5b09c1 JP |
2862 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
2863 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2864 | { | |
1d4c8c29 JP |
2865 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
2866 | ||
2867 | neigh_proc_update(ctl, write); | |
2868 | return ret; | |
cb5b09c1 JP |
2869 | } |
2870 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
2871 | ||
2872 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
2873 | void __user *buffer, | |
2874 | size_t *lenp, loff_t *ppos) | |
2875 | { | |
1d4c8c29 JP |
2876 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
2877 | ||
2878 | neigh_proc_update(ctl, write); | |
2879 | return ret; | |
cb5b09c1 JP |
2880 | } |
2881 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
2882 | ||
2883 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
2884 | void __user *buffer, | |
2885 | size_t *lenp, loff_t *ppos) | |
2886 | { | |
1d4c8c29 JP |
2887 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
2888 | ||
2889 | neigh_proc_update(ctl, write); | |
2890 | return ret; | |
cb5b09c1 JP |
2891 | } |
2892 | ||
2893 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
2894 | void __user *buffer, | |
2895 | size_t *lenp, loff_t *ppos) | |
2896 | { | |
1d4c8c29 JP |
2897 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
2898 | ||
2899 | neigh_proc_update(ctl, write); | |
2900 | return ret; | |
cb5b09c1 JP |
2901 | } |
2902 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
2903 | ||
2904 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
2905 | void __user *buffer, | |
2906 | size_t *lenp, loff_t *ppos) | |
2907 | { | |
1d4c8c29 JP |
2908 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
2909 | ||
2910 | neigh_proc_update(ctl, write); | |
2911 | return ret; | |
cb5b09c1 JP |
2912 | } |
2913 | ||
4bf6980d JFR |
2914 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
2915 | void __user *buffer, | |
2916 | size_t *lenp, loff_t *ppos) | |
2917 | { | |
2918 | struct neigh_parms *p = ctl->extra2; | |
2919 | int ret; | |
2920 | ||
2921 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
2922 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
2923 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
2924 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
2925 | else | |
2926 | ret = -1; | |
2927 | ||
2928 | if (write && ret == 0) { | |
2929 | /* update reachable_time as well, otherwise, the change will | |
2930 | * only be effective after the next time neigh_periodic_work | |
2931 | * decides to recompute it | |
2932 | */ | |
2933 | p->reachable_time = | |
2934 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
2935 | } | |
2936 | return ret; | |
2937 | } | |
2938 | ||
1f9248e5 JP |
2939 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
2940 | (&((struct neigh_parms *) 0)->data[index]) | |
2941 | ||
2942 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
2943 | [NEIGH_VAR_ ## attr] = { \ | |
2944 | .procname = name, \ | |
2945 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
2946 | .maxlen = sizeof(int), \ | |
2947 | .mode = mval, \ | |
2948 | .proc_handler = proc, \ | |
2949 | } | |
2950 | ||
2951 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
2952 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
2953 | ||
2954 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2955 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
2956 | |
2957 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2958 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 JP |
2959 | |
2960 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2961 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
2962 | |
2963 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 2964 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
2965 | |
2966 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 2967 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 2968 | |
1da177e4 LT |
2969 | static struct neigh_sysctl_table { |
2970 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 2971 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 2972 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 2973 | .neigh_vars = { |
1f9248e5 JP |
2974 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
2975 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
2976 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
2977 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), | |
2978 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
2979 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
2980 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
2981 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
2982 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
2983 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
2984 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
2985 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
2986 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
2987 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
2988 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 2989 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
2990 | .procname = "gc_interval", |
2991 | .maxlen = sizeof(int), | |
2992 | .mode = 0644, | |
6d9f239a | 2993 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 2994 | }, |
8b5c171b | 2995 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
2996 | .procname = "gc_thresh1", |
2997 | .maxlen = sizeof(int), | |
2998 | .mode = 0644, | |
555445cd FF |
2999 | .extra1 = &zero, |
3000 | .extra2 = &int_max, | |
3001 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3002 | }, |
8b5c171b | 3003 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3004 | .procname = "gc_thresh2", |
3005 | .maxlen = sizeof(int), | |
3006 | .mode = 0644, | |
555445cd FF |
3007 | .extra1 = &zero, |
3008 | .extra2 = &int_max, | |
3009 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3010 | }, |
8b5c171b | 3011 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3012 | .procname = "gc_thresh3", |
3013 | .maxlen = sizeof(int), | |
3014 | .mode = 0644, | |
555445cd FF |
3015 | .extra1 = &zero, |
3016 | .extra2 = &int_max, | |
3017 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3018 | }, |
c3bac5a7 | 3019 | {}, |
1da177e4 LT |
3020 | }, |
3021 | }; | |
3022 | ||
3023 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3024 | proc_handler *handler) |
1da177e4 | 3025 | { |
1f9248e5 | 3026 | int i; |
3c607bbb | 3027 | struct neigh_sysctl_table *t; |
1f9248e5 | 3028 | const char *dev_name_source; |
8f40a1f9 | 3029 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3030 | char *p_name; |
1da177e4 | 3031 | |
3c607bbb | 3032 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3033 | if (!t) |
3c607bbb PE |
3034 | goto err; |
3035 | ||
b194c1f1 | 3036 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3037 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3038 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3039 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3040 | } |
1da177e4 LT |
3041 | |
3042 | if (dev) { | |
3043 | dev_name_source = dev->name; | |
d12af679 | 3044 | /* Terminate the table early */ |
8b5c171b ED |
3045 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3046 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3047 | } else { |
9ecf07a1 | 3048 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3049 | dev_name_source = "default"; |
9ecf07a1 MK |
3050 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3051 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3052 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3053 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3054 | } |
3055 | ||
f8572d8f | 3056 | if (handler) { |
1da177e4 | 3057 | /* RetransTime */ |
8b5c171b | 3058 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3059 | /* ReachableTime */ |
8b5c171b | 3060 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3061 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3062 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3063 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3064 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3065 | } else { |
3066 | /* Those handlers will update p->reachable_time after | |
3067 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3068 | * applied after the next neighbour update instead of waiting for | |
3069 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3070 | * So any handler that replaces them should do this as well | |
3071 | */ | |
3072 | /* ReachableTime */ | |
3073 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3074 | neigh_proc_base_reachable_time; | |
3075 | /* ReachableTime (in milliseconds) */ | |
3076 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3077 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3078 | } |
3079 | ||
464dc801 EB |
3080 | /* Don't export sysctls to unprivileged users */ |
3081 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3082 | t->neigh_vars[0].procname = NULL; | |
3083 | ||
73af614a JP |
3084 | switch (neigh_parms_family(p)) { |
3085 | case AF_INET: | |
3086 | p_name = "ipv4"; | |
3087 | break; | |
3088 | case AF_INET6: | |
3089 | p_name = "ipv6"; | |
3090 | break; | |
3091 | default: | |
3092 | BUG(); | |
3093 | } | |
3094 | ||
8f40a1f9 EB |
3095 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3096 | p_name, dev_name_source); | |
4ab438fc | 3097 | t->sysctl_header = |
8f40a1f9 | 3098 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3099 | if (!t->sysctl_header) |
8f40a1f9 | 3100 | goto free; |
3c607bbb | 3101 | |
1da177e4 LT |
3102 | p->sysctl_table = t; |
3103 | return 0; | |
3104 | ||
3c607bbb | 3105 | free: |
1da177e4 | 3106 | kfree(t); |
3c607bbb PE |
3107 | err: |
3108 | return -ENOBUFS; | |
1da177e4 | 3109 | } |
0a204500 | 3110 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3111 | |
3112 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3113 | { | |
3114 | if (p->sysctl_table) { | |
3115 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3116 | p->sysctl_table = NULL; | |
5dd3df10 | 3117 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3118 | kfree(t); |
3119 | } | |
3120 | } | |
0a204500 | 3121 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3122 | |
3123 | #endif /* CONFIG_SYSCTL */ | |
3124 | ||
c8822a4e TG |
3125 | static int __init neigh_init(void) |
3126 | { | |
c7ac8679 GR |
3127 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
3128 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); | |
3129 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); | |
c8822a4e | 3130 | |
c7ac8679 GR |
3131 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
3132 | NULL); | |
3133 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); | |
c8822a4e TG |
3134 | |
3135 | return 0; | |
3136 | } | |
3137 | ||
3138 | subsys_initcall(neigh_init); | |
3139 |