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Commit | Line | Data |
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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 | ||
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/socket.h> | |
1da177e4 LT |
22 | #include <linux/netdevice.h> |
23 | #include <linux/proc_fs.h> | |
24 | #ifdef CONFIG_SYSCTL | |
25 | #include <linux/sysctl.h> | |
26 | #endif | |
27 | #include <linux/times.h> | |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 LT |
29 | #include <net/neighbour.h> |
30 | #include <net/dst.h> | |
31 | #include <net/sock.h> | |
8d71740c | 32 | #include <net/netevent.h> |
a14a49d2 | 33 | #include <net/netlink.h> |
1da177e4 LT |
34 | #include <linux/rtnetlink.h> |
35 | #include <linux/random.h> | |
543537bd | 36 | #include <linux/string.h> |
c3609d51 | 37 | #include <linux/log2.h> |
1da177e4 LT |
38 | |
39 | #define NEIGH_DEBUG 1 | |
40 | ||
41 | #define NEIGH_PRINTK(x...) printk(x) | |
42 | #define NEIGH_NOPRINTK(x...) do { ; } while(0) | |
43 | #define NEIGH_PRINTK0 NEIGH_PRINTK | |
44 | #define NEIGH_PRINTK1 NEIGH_NOPRINTK | |
45 | #define NEIGH_PRINTK2 NEIGH_NOPRINTK | |
46 | ||
47 | #if NEIGH_DEBUG >= 1 | |
48 | #undef NEIGH_PRINTK1 | |
49 | #define NEIGH_PRINTK1 NEIGH_PRINTK | |
50 | #endif | |
51 | #if NEIGH_DEBUG >= 2 | |
52 | #undef NEIGH_PRINTK2 | |
53 | #define NEIGH_PRINTK2 NEIGH_PRINTK | |
54 | #endif | |
55 | ||
56 | #define PNEIGH_HASHMASK 0xF | |
57 | ||
58 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
59 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
60 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 61 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 LT |
62 | |
63 | static struct neigh_table *neigh_tables; | |
45fc3b11 | 64 | #ifdef CONFIG_PROC_FS |
9a32144e | 65 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 66 | #endif |
1da177e4 LT |
67 | |
68 | /* | |
69 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
70 | ||
71 | - All the scans/updates to hash buckets MUST be made under this lock. | |
72 | - NOTHING clever should be made under this lock: no callbacks | |
73 | to protocol backends, no attempts to send something to network. | |
74 | It will result in deadlocks, if backend/driver wants to use neighbour | |
75 | cache. | |
76 | - If the entry requires some non-trivial actions, increase | |
77 | its reference count and release table lock. | |
78 | ||
79 | Neighbour entries are protected: | |
80 | - with reference count. | |
81 | - with rwlock neigh->lock | |
82 | ||
83 | Reference count prevents destruction. | |
84 | ||
85 | neigh->lock mainly serializes ll address data and its validity state. | |
86 | However, the same lock is used to protect another entry fields: | |
87 | - timer | |
88 | - resolution queue | |
89 | ||
90 | Again, nothing clever shall be made under neigh->lock, | |
91 | the most complicated procedure, which we allow is dev->hard_header. | |
92 | It is supposed, that dev->hard_header is simplistic and does | |
93 | not make callbacks to neighbour tables. | |
94 | ||
95 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting | |
96 | list of neighbour tables. This list is used only in process context, | |
97 | */ | |
98 | ||
99 | static DEFINE_RWLOCK(neigh_tbl_lock); | |
100 | ||
101 | static int neigh_blackhole(struct sk_buff *skb) | |
102 | { | |
103 | kfree_skb(skb); | |
104 | return -ENETDOWN; | |
105 | } | |
106 | ||
4f494554 TG |
107 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
108 | { | |
109 | if (neigh->parms->neigh_cleanup) | |
110 | neigh->parms->neigh_cleanup(neigh); | |
111 | ||
d961db35 | 112 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
113 | neigh_release(neigh); |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
118 | * It corresponds to default IPv6 settings and is not overridable, | |
119 | * because it is really reasonable choice. | |
120 | */ | |
121 | ||
122 | unsigned long neigh_rand_reach_time(unsigned long base) | |
123 | { | |
124 | return (base ? (net_random() % base) + (base >> 1) : 0); | |
125 | } | |
126 | ||
127 | ||
128 | static int neigh_forced_gc(struct neigh_table *tbl) | |
129 | { | |
130 | int shrunk = 0; | |
131 | int i; | |
132 | ||
133 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
134 | ||
135 | write_lock_bh(&tbl->lock); | |
136 | for (i = 0; i <= tbl->hash_mask; i++) { | |
137 | struct neighbour *n, **np; | |
138 | ||
139 | np = &tbl->hash_buckets[i]; | |
140 | while ((n = *np) != NULL) { | |
141 | /* Neighbour record may be discarded if: | |
142 | * - nobody refers to it. | |
143 | * - it is not permanent | |
144 | */ | |
145 | write_lock(&n->lock); | |
146 | if (atomic_read(&n->refcnt) == 1 && | |
147 | !(n->nud_state & NUD_PERMANENT)) { | |
148 | *np = n->next; | |
149 | n->dead = 1; | |
150 | shrunk = 1; | |
151 | write_unlock(&n->lock); | |
4f494554 | 152 | neigh_cleanup_and_release(n); |
1da177e4 LT |
153 | continue; |
154 | } | |
155 | write_unlock(&n->lock); | |
156 | np = &n->next; | |
157 | } | |
158 | } | |
159 | ||
160 | tbl->last_flush = jiffies; | |
161 | ||
162 | write_unlock_bh(&tbl->lock); | |
163 | ||
164 | return shrunk; | |
165 | } | |
166 | ||
a43d8994 PE |
167 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
168 | { | |
169 | neigh_hold(n); | |
170 | if (unlikely(mod_timer(&n->timer, when))) { | |
171 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
172 | n->nud_state); | |
173 | dump_stack(); | |
174 | } | |
175 | } | |
176 | ||
1da177e4 LT |
177 | static int neigh_del_timer(struct neighbour *n) |
178 | { | |
179 | if ((n->nud_state & NUD_IN_TIMER) && | |
180 | del_timer(&n->timer)) { | |
181 | neigh_release(n); | |
182 | return 1; | |
183 | } | |
184 | return 0; | |
185 | } | |
186 | ||
187 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
188 | { | |
189 | struct sk_buff *skb; | |
190 | ||
191 | while ((skb = skb_dequeue(list)) != NULL) { | |
192 | dev_put(skb->dev); | |
193 | kfree_skb(skb); | |
194 | } | |
195 | } | |
196 | ||
49636bb1 | 197 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
198 | { |
199 | int i; | |
200 | ||
1da177e4 LT |
201 | for (i = 0; i <= tbl->hash_mask; i++) { |
202 | struct neighbour *n, **np = &tbl->hash_buckets[i]; | |
203 | ||
204 | while ((n = *np) != NULL) { | |
205 | if (dev && n->dev != dev) { | |
206 | np = &n->next; | |
207 | continue; | |
208 | } | |
209 | *np = n->next; | |
210 | write_lock(&n->lock); | |
211 | neigh_del_timer(n); | |
212 | n->dead = 1; | |
213 | ||
214 | if (atomic_read(&n->refcnt) != 1) { | |
215 | /* The most unpleasant situation. | |
216 | We must destroy neighbour entry, | |
217 | but someone still uses it. | |
218 | ||
219 | The destroy will be delayed until | |
220 | the last user releases us, but | |
221 | we must kill timers etc. and move | |
222 | it to safe state. | |
223 | */ | |
224 | skb_queue_purge(&n->arp_queue); | |
225 | n->output = neigh_blackhole; | |
226 | if (n->nud_state & NUD_VALID) | |
227 | n->nud_state = NUD_NOARP; | |
228 | else | |
229 | n->nud_state = NUD_NONE; | |
230 | NEIGH_PRINTK2("neigh %p is stray.\n", n); | |
231 | } | |
232 | write_unlock(&n->lock); | |
4f494554 | 233 | neigh_cleanup_and_release(n); |
1da177e4 LT |
234 | } |
235 | } | |
49636bb1 | 236 | } |
1da177e4 | 237 | |
49636bb1 HX |
238 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
239 | { | |
240 | write_lock_bh(&tbl->lock); | |
241 | neigh_flush_dev(tbl, dev); | |
242 | write_unlock_bh(&tbl->lock); | |
243 | } | |
244 | ||
245 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
246 | { | |
247 | write_lock_bh(&tbl->lock); | |
248 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
249 | pneigh_ifdown(tbl, dev); |
250 | write_unlock_bh(&tbl->lock); | |
251 | ||
252 | del_timer_sync(&tbl->proxy_timer); | |
253 | pneigh_queue_purge(&tbl->proxy_queue); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | static struct neighbour *neigh_alloc(struct neigh_table *tbl) | |
258 | { | |
259 | struct neighbour *n = NULL; | |
260 | unsigned long now = jiffies; | |
261 | int entries; | |
262 | ||
263 | entries = atomic_inc_return(&tbl->entries) - 1; | |
264 | if (entries >= tbl->gc_thresh3 || | |
265 | (entries >= tbl->gc_thresh2 && | |
266 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
267 | if (!neigh_forced_gc(tbl) && | |
268 | entries >= tbl->gc_thresh3) | |
269 | goto out_entries; | |
270 | } | |
271 | ||
c3762229 | 272 | n = kmem_cache_zalloc(tbl->kmem_cachep, GFP_ATOMIC); |
1da177e4 LT |
273 | if (!n) |
274 | goto out_entries; | |
275 | ||
1da177e4 LT |
276 | skb_queue_head_init(&n->arp_queue); |
277 | rwlock_init(&n->lock); | |
278 | n->updated = n->used = now; | |
279 | n->nud_state = NUD_NONE; | |
280 | n->output = neigh_blackhole; | |
281 | n->parms = neigh_parms_clone(&tbl->parms); | |
b24b8a24 | 282 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
283 | |
284 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
285 | n->tbl = tbl; | |
286 | atomic_set(&n->refcnt, 1); | |
287 | n->dead = 1; | |
288 | out: | |
289 | return n; | |
290 | ||
291 | out_entries: | |
292 | atomic_dec(&tbl->entries); | |
293 | goto out; | |
294 | } | |
295 | ||
296 | static struct neighbour **neigh_hash_alloc(unsigned int entries) | |
297 | { | |
298 | unsigned long size = entries * sizeof(struct neighbour *); | |
299 | struct neighbour **ret; | |
300 | ||
301 | if (size <= PAGE_SIZE) { | |
77d04bd9 | 302 | ret = kzalloc(size, GFP_ATOMIC); |
1da177e4 LT |
303 | } else { |
304 | ret = (struct neighbour **) | |
77d04bd9 | 305 | __get_free_pages(GFP_ATOMIC|__GFP_ZERO, get_order(size)); |
1da177e4 | 306 | } |
1da177e4 LT |
307 | return ret; |
308 | } | |
309 | ||
310 | static void neigh_hash_free(struct neighbour **hash, unsigned int entries) | |
311 | { | |
312 | unsigned long size = entries * sizeof(struct neighbour *); | |
313 | ||
314 | if (size <= PAGE_SIZE) | |
315 | kfree(hash); | |
316 | else | |
317 | free_pages((unsigned long)hash, get_order(size)); | |
318 | } | |
319 | ||
320 | static void neigh_hash_grow(struct neigh_table *tbl, unsigned long new_entries) | |
321 | { | |
322 | struct neighbour **new_hash, **old_hash; | |
323 | unsigned int i, new_hash_mask, old_entries; | |
324 | ||
325 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
326 | ||
c3609d51 | 327 | BUG_ON(!is_power_of_2(new_entries)); |
1da177e4 LT |
328 | new_hash = neigh_hash_alloc(new_entries); |
329 | if (!new_hash) | |
330 | return; | |
331 | ||
332 | old_entries = tbl->hash_mask + 1; | |
333 | new_hash_mask = new_entries - 1; | |
334 | old_hash = tbl->hash_buckets; | |
335 | ||
336 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); | |
337 | for (i = 0; i < old_entries; i++) { | |
338 | struct neighbour *n, *next; | |
339 | ||
340 | for (n = old_hash[i]; n; n = next) { | |
341 | unsigned int hash_val = tbl->hash(n->primary_key, n->dev); | |
342 | ||
343 | hash_val &= new_hash_mask; | |
344 | next = n->next; | |
345 | ||
346 | n->next = new_hash[hash_val]; | |
347 | new_hash[hash_val] = n; | |
348 | } | |
349 | } | |
350 | tbl->hash_buckets = new_hash; | |
351 | tbl->hash_mask = new_hash_mask; | |
352 | ||
353 | neigh_hash_free(old_hash, old_entries); | |
354 | } | |
355 | ||
356 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
357 | struct net_device *dev) | |
358 | { | |
359 | struct neighbour *n; | |
360 | int key_len = tbl->key_len; | |
c5e29460 | 361 | u32 hash_val = tbl->hash(pkey, dev); |
4ec93edb | 362 | |
1da177e4 LT |
363 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
364 | ||
365 | read_lock_bh(&tbl->lock); | |
c5e29460 | 366 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
1da177e4 LT |
367 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
368 | neigh_hold(n); | |
369 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
370 | break; | |
371 | } | |
372 | } | |
373 | read_unlock_bh(&tbl->lock); | |
374 | return n; | |
375 | } | |
376 | ||
426b5303 EB |
377 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
378 | const void *pkey) | |
1da177e4 LT |
379 | { |
380 | struct neighbour *n; | |
381 | int key_len = tbl->key_len; | |
c5e29460 | 382 | u32 hash_val = tbl->hash(pkey, NULL); |
1da177e4 LT |
383 | |
384 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
385 | ||
386 | read_lock_bh(&tbl->lock); | |
c5e29460 | 387 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
426b5303 EB |
388 | if (!memcmp(n->primary_key, pkey, key_len) && |
389 | (net == n->dev->nd_net)) { | |
1da177e4 LT |
390 | neigh_hold(n); |
391 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
392 | break; | |
393 | } | |
394 | } | |
395 | read_unlock_bh(&tbl->lock); | |
396 | return n; | |
397 | } | |
398 | ||
399 | struct neighbour *neigh_create(struct neigh_table *tbl, const void *pkey, | |
400 | struct net_device *dev) | |
401 | { | |
402 | u32 hash_val; | |
403 | int key_len = tbl->key_len; | |
404 | int error; | |
405 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl); | |
406 | ||
407 | if (!n) { | |
408 | rc = ERR_PTR(-ENOBUFS); | |
409 | goto out; | |
410 | } | |
411 | ||
412 | memcpy(n->primary_key, pkey, key_len); | |
413 | n->dev = dev; | |
414 | dev_hold(dev); | |
415 | ||
416 | /* Protocol specific setup. */ | |
417 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
418 | rc = ERR_PTR(error); | |
419 | goto out_neigh_release; | |
420 | } | |
421 | ||
422 | /* Device specific setup. */ | |
423 | if (n->parms->neigh_setup && | |
424 | (error = n->parms->neigh_setup(n)) < 0) { | |
425 | rc = ERR_PTR(error); | |
426 | goto out_neigh_release; | |
427 | } | |
428 | ||
429 | n->confirmed = jiffies - (n->parms->base_reachable_time << 1); | |
430 | ||
431 | write_lock_bh(&tbl->lock); | |
432 | ||
433 | if (atomic_read(&tbl->entries) > (tbl->hash_mask + 1)) | |
434 | neigh_hash_grow(tbl, (tbl->hash_mask + 1) << 1); | |
435 | ||
436 | hash_val = tbl->hash(pkey, dev) & tbl->hash_mask; | |
437 | ||
438 | if (n->parms->dead) { | |
439 | rc = ERR_PTR(-EINVAL); | |
440 | goto out_tbl_unlock; | |
441 | } | |
442 | ||
443 | for (n1 = tbl->hash_buckets[hash_val]; n1; n1 = n1->next) { | |
444 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { | |
445 | neigh_hold(n1); | |
446 | rc = n1; | |
447 | goto out_tbl_unlock; | |
448 | } | |
449 | } | |
450 | ||
451 | n->next = tbl->hash_buckets[hash_val]; | |
452 | tbl->hash_buckets[hash_val] = n; | |
453 | n->dead = 0; | |
454 | neigh_hold(n); | |
455 | write_unlock_bh(&tbl->lock); | |
456 | NEIGH_PRINTK2("neigh %p is created.\n", n); | |
457 | rc = n; | |
458 | out: | |
459 | return rc; | |
460 | out_tbl_unlock: | |
461 | write_unlock_bh(&tbl->lock); | |
462 | out_neigh_release: | |
463 | neigh_release(n); | |
464 | goto out; | |
465 | } | |
466 | ||
426b5303 EB |
467 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
468 | struct net *net, const void *pkey, | |
1da177e4 LT |
469 | struct net_device *dev, int creat) |
470 | { | |
471 | struct pneigh_entry *n; | |
472 | int key_len = tbl->key_len; | |
473 | u32 hash_val = *(u32 *)(pkey + key_len - 4); | |
474 | ||
475 | hash_val ^= (hash_val >> 16); | |
476 | hash_val ^= hash_val >> 8; | |
477 | hash_val ^= hash_val >> 4; | |
478 | hash_val &= PNEIGH_HASHMASK; | |
479 | ||
480 | read_lock_bh(&tbl->lock); | |
481 | ||
482 | for (n = tbl->phash_buckets[hash_val]; n; n = n->next) { | |
483 | if (!memcmp(n->key, pkey, key_len) && | |
426b5303 | 484 | (n->net == net) && |
1da177e4 LT |
485 | (n->dev == dev || !n->dev)) { |
486 | read_unlock_bh(&tbl->lock); | |
487 | goto out; | |
488 | } | |
489 | } | |
490 | read_unlock_bh(&tbl->lock); | |
491 | n = NULL; | |
492 | if (!creat) | |
493 | goto out; | |
494 | ||
4ae28944 PE |
495 | ASSERT_RTNL(); |
496 | ||
1da177e4 LT |
497 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
498 | if (!n) | |
499 | goto out; | |
500 | ||
426b5303 | 501 | n->net = hold_net(net); |
1da177e4 LT |
502 | memcpy(n->key, pkey, key_len); |
503 | n->dev = dev; | |
504 | if (dev) | |
505 | dev_hold(dev); | |
506 | ||
507 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
508 | if (dev) | |
509 | dev_put(dev); | |
da12f735 | 510 | release_net(net); |
1da177e4 LT |
511 | kfree(n); |
512 | n = NULL; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | write_lock_bh(&tbl->lock); | |
517 | n->next = tbl->phash_buckets[hash_val]; | |
518 | tbl->phash_buckets[hash_val] = n; | |
519 | write_unlock_bh(&tbl->lock); | |
520 | out: | |
521 | return n; | |
522 | } | |
523 | ||
524 | ||
426b5303 | 525 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
526 | struct net_device *dev) |
527 | { | |
528 | struct pneigh_entry *n, **np; | |
529 | int key_len = tbl->key_len; | |
530 | u32 hash_val = *(u32 *)(pkey + key_len - 4); | |
531 | ||
532 | hash_val ^= (hash_val >> 16); | |
533 | hash_val ^= hash_val >> 8; | |
534 | hash_val ^= hash_val >> 4; | |
535 | hash_val &= PNEIGH_HASHMASK; | |
536 | ||
537 | write_lock_bh(&tbl->lock); | |
538 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
539 | np = &n->next) { | |
426b5303 EB |
540 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
541 | (n->net == net)) { | |
1da177e4 LT |
542 | *np = n->next; |
543 | write_unlock_bh(&tbl->lock); | |
544 | if (tbl->pdestructor) | |
545 | tbl->pdestructor(n); | |
546 | if (n->dev) | |
547 | dev_put(n->dev); | |
426b5303 | 548 | release_net(n->net); |
1da177e4 LT |
549 | kfree(n); |
550 | return 0; | |
551 | } | |
552 | } | |
553 | write_unlock_bh(&tbl->lock); | |
554 | return -ENOENT; | |
555 | } | |
556 | ||
557 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
558 | { | |
559 | struct pneigh_entry *n, **np; | |
560 | u32 h; | |
561 | ||
562 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
563 | np = &tbl->phash_buckets[h]; | |
564 | while ((n = *np) != NULL) { | |
565 | if (!dev || n->dev == dev) { | |
566 | *np = n->next; | |
567 | if (tbl->pdestructor) | |
568 | tbl->pdestructor(n); | |
569 | if (n->dev) | |
570 | dev_put(n->dev); | |
426b5303 | 571 | release_net(n->net); |
1da177e4 LT |
572 | kfree(n); |
573 | continue; | |
574 | } | |
575 | np = &n->next; | |
576 | } | |
577 | } | |
578 | return -ENOENT; | |
579 | } | |
580 | ||
06f0511d DL |
581 | static void neigh_parms_destroy(struct neigh_parms *parms); |
582 | ||
583 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
584 | { | |
585 | if (atomic_dec_and_test(&parms->refcnt)) | |
586 | neigh_parms_destroy(parms); | |
587 | } | |
1da177e4 LT |
588 | |
589 | /* | |
590 | * neighbour must already be out of the table; | |
591 | * | |
592 | */ | |
593 | void neigh_destroy(struct neighbour *neigh) | |
594 | { | |
595 | struct hh_cache *hh; | |
596 | ||
597 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); | |
598 | ||
599 | if (!neigh->dead) { | |
600 | printk(KERN_WARNING | |
601 | "Destroying alive neighbour %p\n", neigh); | |
602 | dump_stack(); | |
603 | return; | |
604 | } | |
605 | ||
606 | if (neigh_del_timer(neigh)) | |
607 | printk(KERN_WARNING "Impossible event.\n"); | |
608 | ||
609 | while ((hh = neigh->hh) != NULL) { | |
610 | neigh->hh = hh->hh_next; | |
611 | hh->hh_next = NULL; | |
3644f0ce SH |
612 | |
613 | write_seqlock_bh(&hh->hh_lock); | |
1da177e4 | 614 | hh->hh_output = neigh_blackhole; |
3644f0ce | 615 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
616 | if (atomic_dec_and_test(&hh->hh_refcnt)) |
617 | kfree(hh); | |
618 | } | |
619 | ||
1da177e4 LT |
620 | skb_queue_purge(&neigh->arp_queue); |
621 | ||
622 | dev_put(neigh->dev); | |
623 | neigh_parms_put(neigh->parms); | |
624 | ||
625 | NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh); | |
626 | ||
627 | atomic_dec(&neigh->tbl->entries); | |
628 | kmem_cache_free(neigh->tbl->kmem_cachep, neigh); | |
629 | } | |
630 | ||
631 | /* Neighbour state is suspicious; | |
632 | disable fast path. | |
633 | ||
634 | Called with write_locked neigh. | |
635 | */ | |
636 | static void neigh_suspect(struct neighbour *neigh) | |
637 | { | |
638 | struct hh_cache *hh; | |
639 | ||
640 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
641 | ||
642 | neigh->output = neigh->ops->output; | |
643 | ||
644 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
645 | hh->hh_output = neigh->ops->output; | |
646 | } | |
647 | ||
648 | /* Neighbour state is OK; | |
649 | enable fast path. | |
650 | ||
651 | Called with write_locked neigh. | |
652 | */ | |
653 | static void neigh_connect(struct neighbour *neigh) | |
654 | { | |
655 | struct hh_cache *hh; | |
656 | ||
657 | NEIGH_PRINTK2("neigh %p is connected.\n", neigh); | |
658 | ||
659 | neigh->output = neigh->ops->connected_output; | |
660 | ||
661 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
662 | hh->hh_output = neigh->ops->hh_output; | |
663 | } | |
664 | ||
665 | static void neigh_periodic_timer(unsigned long arg) | |
666 | { | |
667 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
668 | struct neighbour *n, **np; | |
669 | unsigned long expire, now = jiffies; | |
670 | ||
671 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
672 | ||
673 | write_lock(&tbl->lock); | |
674 | ||
675 | /* | |
676 | * periodically recompute ReachableTime from random function | |
677 | */ | |
678 | ||
679 | if (time_after(now, tbl->last_rand + 300 * HZ)) { | |
680 | struct neigh_parms *p; | |
681 | tbl->last_rand = now; | |
682 | for (p = &tbl->parms; p; p = p->next) | |
683 | p->reachable_time = | |
684 | neigh_rand_reach_time(p->base_reachable_time); | |
685 | } | |
686 | ||
687 | np = &tbl->hash_buckets[tbl->hash_chain_gc]; | |
688 | tbl->hash_chain_gc = ((tbl->hash_chain_gc + 1) & tbl->hash_mask); | |
689 | ||
690 | while ((n = *np) != NULL) { | |
691 | unsigned int state; | |
692 | ||
693 | write_lock(&n->lock); | |
694 | ||
695 | state = n->nud_state; | |
696 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
697 | write_unlock(&n->lock); | |
698 | goto next_elt; | |
699 | } | |
700 | ||
701 | if (time_before(n->used, n->confirmed)) | |
702 | n->used = n->confirmed; | |
703 | ||
704 | if (atomic_read(&n->refcnt) == 1 && | |
705 | (state == NUD_FAILED || | |
706 | time_after(now, n->used + n->parms->gc_staletime))) { | |
707 | *np = n->next; | |
708 | n->dead = 1; | |
709 | write_unlock(&n->lock); | |
4f494554 | 710 | neigh_cleanup_and_release(n); |
1da177e4 LT |
711 | continue; |
712 | } | |
713 | write_unlock(&n->lock); | |
714 | ||
715 | next_elt: | |
716 | np = &n->next; | |
717 | } | |
718 | ||
4ec93edb YH |
719 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
720 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 | |
721 | * base_reachable_time. | |
1da177e4 LT |
722 | */ |
723 | expire = tbl->parms.base_reachable_time >> 1; | |
724 | expire /= (tbl->hash_mask + 1); | |
725 | if (!expire) | |
726 | expire = 1; | |
727 | ||
f5a6e01c AV |
728 | if (expire>HZ) |
729 | mod_timer(&tbl->gc_timer, round_jiffies(now + expire)); | |
730 | else | |
731 | mod_timer(&tbl->gc_timer, now + expire); | |
1da177e4 LT |
732 | |
733 | write_unlock(&tbl->lock); | |
734 | } | |
735 | ||
736 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
737 | { | |
738 | struct neigh_parms *p = n->parms; | |
739 | return (n->nud_state & NUD_PROBE ? | |
740 | p->ucast_probes : | |
741 | p->ucast_probes + p->app_probes + p->mcast_probes); | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /* Called when a timer expires for a neighbour entry. */ |
745 | ||
746 | static void neigh_timer_handler(unsigned long arg) | |
747 | { | |
748 | unsigned long now, next; | |
749 | struct neighbour *neigh = (struct neighbour *)arg; | |
750 | unsigned state; | |
751 | int notify = 0; | |
752 | ||
753 | write_lock(&neigh->lock); | |
754 | ||
755 | state = neigh->nud_state; | |
756 | now = jiffies; | |
757 | next = now + HZ; | |
758 | ||
759 | if (!(state & NUD_IN_TIMER)) { | |
760 | #ifndef CONFIG_SMP | |
761 | printk(KERN_WARNING "neigh: timer & !nud_in_timer\n"); | |
762 | #endif | |
763 | goto out; | |
764 | } | |
765 | ||
766 | if (state & NUD_REACHABLE) { | |
4ec93edb | 767 | if (time_before_eq(now, |
1da177e4 LT |
768 | neigh->confirmed + neigh->parms->reachable_time)) { |
769 | NEIGH_PRINTK2("neigh %p is still alive.\n", neigh); | |
770 | next = neigh->confirmed + neigh->parms->reachable_time; | |
771 | } else if (time_before_eq(now, | |
772 | neigh->used + neigh->parms->delay_probe_time)) { | |
773 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
774 | neigh->nud_state = NUD_DELAY; | |
955aaa2f | 775 | neigh->updated = jiffies; |
1da177e4 LT |
776 | neigh_suspect(neigh); |
777 | next = now + neigh->parms->delay_probe_time; | |
778 | } else { | |
779 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
780 | neigh->nud_state = NUD_STALE; | |
955aaa2f | 781 | neigh->updated = jiffies; |
1da177e4 | 782 | neigh_suspect(neigh); |
8d71740c | 783 | notify = 1; |
1da177e4 LT |
784 | } |
785 | } else if (state & NUD_DELAY) { | |
4ec93edb | 786 | if (time_before_eq(now, |
1da177e4 LT |
787 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
788 | NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh); | |
789 | neigh->nud_state = NUD_REACHABLE; | |
955aaa2f | 790 | neigh->updated = jiffies; |
1da177e4 | 791 | neigh_connect(neigh); |
8d71740c | 792 | notify = 1; |
1da177e4 LT |
793 | next = neigh->confirmed + neigh->parms->reachable_time; |
794 | } else { | |
795 | NEIGH_PRINTK2("neigh %p is probed.\n", neigh); | |
796 | neigh->nud_state = NUD_PROBE; | |
955aaa2f | 797 | neigh->updated = jiffies; |
1da177e4 LT |
798 | atomic_set(&neigh->probes, 0); |
799 | next = now + neigh->parms->retrans_time; | |
800 | } | |
801 | } else { | |
802 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
803 | next = now + neigh->parms->retrans_time; | |
804 | } | |
805 | ||
806 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
807 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
808 | struct sk_buff *skb; | |
809 | ||
810 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 811 | neigh->updated = jiffies; |
1da177e4 LT |
812 | notify = 1; |
813 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
814 | NEIGH_PRINTK2("neigh %p is failed.\n", neigh); | |
815 | ||
816 | /* It is very thin place. report_unreachable is very complicated | |
817 | routine. Particularly, it can hit the same neighbour entry! | |
818 | ||
819 | So that, we try to be accurate and avoid dead loop. --ANK | |
820 | */ | |
821 | while (neigh->nud_state == NUD_FAILED && | |
822 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
823 | write_unlock(&neigh->lock); | |
824 | neigh->ops->error_report(neigh, skb); | |
825 | write_lock(&neigh->lock); | |
826 | } | |
827 | skb_queue_purge(&neigh->arp_queue); | |
828 | } | |
829 | ||
830 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
831 | if (time_before(next, jiffies + HZ/2)) |
832 | next = jiffies + HZ/2; | |
6fb9974f HX |
833 | if (!mod_timer(&neigh->timer, next)) |
834 | neigh_hold(neigh); | |
1da177e4 LT |
835 | } |
836 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
837 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); | |
9ff56607 DM |
838 | /* keep skb alive even if arp_queue overflows */ |
839 | if (skb) | |
840 | skb_get(skb); | |
841 | write_unlock(&neigh->lock); | |
1da177e4 LT |
842 | neigh->ops->solicit(neigh, skb); |
843 | atomic_inc(&neigh->probes); | |
9ff56607 DM |
844 | if (skb) |
845 | kfree_skb(skb); | |
846 | } else { | |
69cc64d8 | 847 | out: |
9ff56607 DM |
848 | write_unlock(&neigh->lock); |
849 | } | |
d961db35 | 850 | |
8d71740c | 851 | if (notify) |
d961db35 | 852 | neigh_update_notify(neigh); |
1da177e4 | 853 | |
1da177e4 LT |
854 | neigh_release(neigh); |
855 | } | |
856 | ||
857 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
858 | { | |
859 | int rc; | |
860 | unsigned long now; | |
861 | ||
862 | write_lock_bh(&neigh->lock); | |
863 | ||
864 | rc = 0; | |
865 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
866 | goto out_unlock_bh; | |
867 | ||
868 | now = jiffies; | |
4ec93edb | 869 | |
1da177e4 LT |
870 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
871 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { | |
872 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); | |
873 | neigh->nud_state = NUD_INCOMPLETE; | |
955aaa2f | 874 | neigh->updated = jiffies; |
667347f1 | 875 | neigh_add_timer(neigh, now + 1); |
1da177e4 LT |
876 | } else { |
877 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 878 | neigh->updated = jiffies; |
1da177e4 LT |
879 | write_unlock_bh(&neigh->lock); |
880 | ||
881 | if (skb) | |
882 | kfree_skb(skb); | |
883 | return 1; | |
884 | } | |
885 | } else if (neigh->nud_state & NUD_STALE) { | |
886 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
1da177e4 | 887 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 888 | neigh->updated = jiffies; |
667347f1 DM |
889 | neigh_add_timer(neigh, |
890 | jiffies + neigh->parms->delay_probe_time); | |
1da177e4 LT |
891 | } |
892 | ||
893 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
894 | if (skb) { | |
895 | if (skb_queue_len(&neigh->arp_queue) >= | |
896 | neigh->parms->queue_len) { | |
897 | struct sk_buff *buff; | |
898 | buff = neigh->arp_queue.next; | |
899 | __skb_unlink(buff, &neigh->arp_queue); | |
900 | kfree_skb(buff); | |
901 | } | |
902 | __skb_queue_tail(&neigh->arp_queue, skb); | |
903 | } | |
904 | rc = 1; | |
905 | } | |
906 | out_unlock_bh: | |
907 | write_unlock_bh(&neigh->lock); | |
908 | return rc; | |
909 | } | |
910 | ||
e92b43a3 | 911 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
912 | { |
913 | struct hh_cache *hh; | |
3b04ddde SH |
914 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
915 | = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
916 | |
917 | if (update) { | |
918 | for (hh = neigh->hh; hh; hh = hh->hh_next) { | |
3644f0ce | 919 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 920 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 921 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
922 | } |
923 | } | |
924 | } | |
925 | ||
926 | ||
927 | ||
928 | /* Generic update routine. | |
929 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
930 | -- new is new state. | |
931 | -- flags | |
932 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
933 | if it is different. | |
934 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 935 | lladdr instead of overriding it |
1da177e4 LT |
936 | if it is different. |
937 | It also allows to retain current state | |
938 | if lladdr is unchanged. | |
939 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
940 | ||
4ec93edb | 941 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
942 | NTF_ROUTER flag. |
943 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
944 | a router. | |
945 | ||
946 | Caller MUST hold reference count on the entry. | |
947 | */ | |
948 | ||
949 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
950 | u32 flags) | |
951 | { | |
952 | u8 old; | |
953 | int err; | |
1da177e4 | 954 | int notify = 0; |
1da177e4 LT |
955 | struct net_device *dev; |
956 | int update_isrouter = 0; | |
957 | ||
958 | write_lock_bh(&neigh->lock); | |
959 | ||
960 | dev = neigh->dev; | |
961 | old = neigh->nud_state; | |
962 | err = -EPERM; | |
963 | ||
4ec93edb | 964 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
965 | (old & (NUD_NOARP | NUD_PERMANENT))) |
966 | goto out; | |
967 | ||
968 | if (!(new & NUD_VALID)) { | |
969 | neigh_del_timer(neigh); | |
970 | if (old & NUD_CONNECTED) | |
971 | neigh_suspect(neigh); | |
972 | neigh->nud_state = new; | |
973 | err = 0; | |
1da177e4 | 974 | notify = old & NUD_VALID; |
1da177e4 LT |
975 | goto out; |
976 | } | |
977 | ||
978 | /* Compare new lladdr with cached one */ | |
979 | if (!dev->addr_len) { | |
980 | /* First case: device needs no address. */ | |
981 | lladdr = neigh->ha; | |
982 | } else if (lladdr) { | |
983 | /* The second case: if something is already cached | |
984 | and a new address is proposed: | |
985 | - compare new & old | |
986 | - if they are different, check override flag | |
987 | */ | |
4ec93edb | 988 | if ((old & NUD_VALID) && |
1da177e4 LT |
989 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
990 | lladdr = neigh->ha; | |
991 | } else { | |
992 | /* No address is supplied; if we know something, | |
993 | use it, otherwise discard the request. | |
994 | */ | |
995 | err = -EINVAL; | |
996 | if (!(old & NUD_VALID)) | |
997 | goto out; | |
998 | lladdr = neigh->ha; | |
999 | } | |
1000 | ||
1001 | if (new & NUD_CONNECTED) | |
1002 | neigh->confirmed = jiffies; | |
1003 | neigh->updated = jiffies; | |
1004 | ||
1005 | /* If entry was valid and address is not changed, | |
1006 | do not change entry state, if new one is STALE. | |
1007 | */ | |
1008 | err = 0; | |
1009 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1010 | if (old & NUD_VALID) { | |
1011 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1012 | update_isrouter = 0; | |
1013 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1014 | (old & NUD_CONNECTED)) { | |
1015 | lladdr = neigh->ha; | |
1016 | new = NUD_STALE; | |
1017 | } else | |
1018 | goto out; | |
1019 | } else { | |
1020 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1021 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1022 | (old & NUD_CONNECTED)) | |
1023 | ) | |
1024 | new = old; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | if (new != old) { | |
1029 | neigh_del_timer(neigh); | |
a43d8994 | 1030 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1031 | neigh_add_timer(neigh, (jiffies + |
1032 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1033 | neigh->parms->reachable_time : |
1034 | 0))); | |
1da177e4 LT |
1035 | neigh->nud_state = new; |
1036 | } | |
1037 | ||
1038 | if (lladdr != neigh->ha) { | |
1039 | memcpy(&neigh->ha, lladdr, dev->addr_len); | |
1040 | neigh_update_hhs(neigh); | |
1041 | if (!(new & NUD_CONNECTED)) | |
1042 | neigh->confirmed = jiffies - | |
1043 | (neigh->parms->base_reachable_time << 1); | |
1da177e4 | 1044 | notify = 1; |
1da177e4 LT |
1045 | } |
1046 | if (new == old) | |
1047 | goto out; | |
1048 | if (new & NUD_CONNECTED) | |
1049 | neigh_connect(neigh); | |
1050 | else | |
1051 | neigh_suspect(neigh); | |
1052 | if (!(old & NUD_VALID)) { | |
1053 | struct sk_buff *skb; | |
1054 | ||
1055 | /* Again: avoid dead loop if something went wrong */ | |
1056 | ||
1057 | while (neigh->nud_state & NUD_VALID && | |
1058 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
1059 | struct neighbour *n1 = neigh; | |
1060 | write_unlock_bh(&neigh->lock); | |
1061 | /* On shaper/eql skb->dst->neighbour != neigh :( */ | |
1062 | if (skb->dst && skb->dst->neighbour) | |
1063 | n1 = skb->dst->neighbour; | |
1064 | n1->output(skb); | |
1065 | write_lock_bh(&neigh->lock); | |
1066 | } | |
1067 | skb_queue_purge(&neigh->arp_queue); | |
1068 | } | |
1069 | out: | |
1070 | if (update_isrouter) { | |
1071 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1072 | (neigh->flags | NTF_ROUTER) : | |
1073 | (neigh->flags & ~NTF_ROUTER); | |
1074 | } | |
1075 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1076 | |
1077 | if (notify) | |
d961db35 TG |
1078 | neigh_update_notify(neigh); |
1079 | ||
1da177e4 LT |
1080 | return err; |
1081 | } | |
1082 | ||
1083 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1084 | u8 *lladdr, void *saddr, | |
1085 | struct net_device *dev) | |
1086 | { | |
1087 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1088 | lladdr || !dev->addr_len); | |
1089 | if (neigh) | |
4ec93edb | 1090 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1091 | NEIGH_UPDATE_F_OVERRIDE); |
1092 | return neigh; | |
1093 | } | |
1094 | ||
1095 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst, | |
d77072ec | 1096 | __be16 protocol) |
1da177e4 LT |
1097 | { |
1098 | struct hh_cache *hh; | |
1099 | struct net_device *dev = dst->dev; | |
1100 | ||
1101 | for (hh = n->hh; hh; hh = hh->hh_next) | |
1102 | if (hh->hh_type == protocol) | |
1103 | break; | |
1104 | ||
77d04bd9 | 1105 | if (!hh && (hh = kzalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) { |
3644f0ce | 1106 | seqlock_init(&hh->hh_lock); |
1da177e4 LT |
1107 | hh->hh_type = protocol; |
1108 | atomic_set(&hh->hh_refcnt, 0); | |
1109 | hh->hh_next = NULL; | |
3b04ddde SH |
1110 | |
1111 | if (dev->header_ops->cache(n, hh)) { | |
1da177e4 LT |
1112 | kfree(hh); |
1113 | hh = NULL; | |
1114 | } else { | |
1115 | atomic_inc(&hh->hh_refcnt); | |
1116 | hh->hh_next = n->hh; | |
1117 | n->hh = hh; | |
1118 | if (n->nud_state & NUD_CONNECTED) | |
1119 | hh->hh_output = n->ops->hh_output; | |
1120 | else | |
1121 | hh->hh_output = n->ops->output; | |
1122 | } | |
1123 | } | |
1124 | if (hh) { | |
1125 | atomic_inc(&hh->hh_refcnt); | |
1126 | dst->hh = hh; | |
1127 | } | |
1128 | } | |
1129 | ||
1130 | /* This function can be used in contexts, where only old dev_queue_xmit | |
1131 | worked, f.e. if you want to override normal output path (eql, shaper), | |
1132 | but resolution is not made yet. | |
1133 | */ | |
1134 | ||
1135 | int neigh_compat_output(struct sk_buff *skb) | |
1136 | { | |
1137 | struct net_device *dev = skb->dev; | |
1138 | ||
bbe735e4 | 1139 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1140 | |
0c4e8581 SH |
1141 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
1142 | skb->len) < 0 && | |
3b04ddde | 1143 | dev->header_ops->rebuild(skb)) |
1da177e4 LT |
1144 | return 0; |
1145 | ||
1146 | return dev_queue_xmit(skb); | |
1147 | } | |
1148 | ||
1149 | /* Slow and careful. */ | |
1150 | ||
1151 | int neigh_resolve_output(struct sk_buff *skb) | |
1152 | { | |
1153 | struct dst_entry *dst = skb->dst; | |
1154 | struct neighbour *neigh; | |
1155 | int rc = 0; | |
1156 | ||
1157 | if (!dst || !(neigh = dst->neighbour)) | |
1158 | goto discard; | |
1159 | ||
bbe735e4 | 1160 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1161 | |
1162 | if (!neigh_event_send(neigh, skb)) { | |
1163 | int err; | |
1164 | struct net_device *dev = neigh->dev; | |
3b04ddde | 1165 | if (dev->header_ops->cache && !dst->hh) { |
1da177e4 LT |
1166 | write_lock_bh(&neigh->lock); |
1167 | if (!dst->hh) | |
1168 | neigh_hh_init(neigh, dst, dst->ops->protocol); | |
0c4e8581 SH |
1169 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1170 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1171 | write_unlock_bh(&neigh->lock); |
1172 | } else { | |
1173 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1174 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1175 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1176 | read_unlock_bh(&neigh->lock); |
1177 | } | |
1178 | if (err >= 0) | |
1179 | rc = neigh->ops->queue_xmit(skb); | |
1180 | else | |
1181 | goto out_kfree_skb; | |
1182 | } | |
1183 | out: | |
1184 | return rc; | |
1185 | discard: | |
1186 | NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n", | |
1187 | dst, dst ? dst->neighbour : NULL); | |
1188 | out_kfree_skb: | |
1189 | rc = -EINVAL; | |
1190 | kfree_skb(skb); | |
1191 | goto out; | |
1192 | } | |
1193 | ||
1194 | /* As fast as possible without hh cache */ | |
1195 | ||
1196 | int neigh_connected_output(struct sk_buff *skb) | |
1197 | { | |
1198 | int err; | |
1199 | struct dst_entry *dst = skb->dst; | |
1200 | struct neighbour *neigh = dst->neighbour; | |
1201 | struct net_device *dev = neigh->dev; | |
1202 | ||
bbe735e4 | 1203 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1204 | |
1205 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1206 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1207 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1208 | read_unlock_bh(&neigh->lock); |
1209 | if (err >= 0) | |
1210 | err = neigh->ops->queue_xmit(skb); | |
1211 | else { | |
1212 | err = -EINVAL; | |
1213 | kfree_skb(skb); | |
1214 | } | |
1215 | return err; | |
1216 | } | |
1217 | ||
1218 | static void neigh_proxy_process(unsigned long arg) | |
1219 | { | |
1220 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1221 | long sched_next = 0; | |
1222 | unsigned long now = jiffies; | |
1223 | struct sk_buff *skb; | |
1224 | ||
1225 | spin_lock(&tbl->proxy_queue.lock); | |
1226 | ||
1227 | skb = tbl->proxy_queue.next; | |
1228 | ||
1229 | while (skb != (struct sk_buff *)&tbl->proxy_queue) { | |
1230 | struct sk_buff *back = skb; | |
a61bbcf2 | 1231 | long tdif = NEIGH_CB(back)->sched_next - now; |
1da177e4 LT |
1232 | |
1233 | skb = skb->next; | |
1234 | if (tdif <= 0) { | |
1235 | struct net_device *dev = back->dev; | |
1236 | __skb_unlink(back, &tbl->proxy_queue); | |
1237 | if (tbl->proxy_redo && netif_running(dev)) | |
1238 | tbl->proxy_redo(back); | |
1239 | else | |
1240 | kfree_skb(back); | |
1241 | ||
1242 | dev_put(dev); | |
1243 | } else if (!sched_next || tdif < sched_next) | |
1244 | sched_next = tdif; | |
1245 | } | |
1246 | del_timer(&tbl->proxy_timer); | |
1247 | if (sched_next) | |
1248 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1249 | spin_unlock(&tbl->proxy_queue.lock); | |
1250 | } | |
1251 | ||
1252 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1253 | struct sk_buff *skb) | |
1254 | { | |
1255 | unsigned long now = jiffies; | |
1256 | unsigned long sched_next = now + (net_random() % p->proxy_delay); | |
1257 | ||
1258 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { | |
1259 | kfree_skb(skb); | |
1260 | return; | |
1261 | } | |
a61bbcf2 PM |
1262 | |
1263 | NEIGH_CB(skb)->sched_next = sched_next; | |
1264 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1265 | |
1266 | spin_lock(&tbl->proxy_queue.lock); | |
1267 | if (del_timer(&tbl->proxy_timer)) { | |
1268 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1269 | sched_next = tbl->proxy_timer.expires; | |
1270 | } | |
1271 | dst_release(skb->dst); | |
1272 | skb->dst = NULL; | |
1273 | dev_hold(skb->dev); | |
1274 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1275 | mod_timer(&tbl->proxy_timer, sched_next); | |
1276 | spin_unlock(&tbl->proxy_queue.lock); | |
1277 | } | |
1278 | ||
426b5303 EB |
1279 | static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl, |
1280 | struct net *net, int ifindex) | |
1281 | { | |
1282 | struct neigh_parms *p; | |
1283 | ||
1284 | for (p = &tbl->parms; p; p = p->next) { | |
1285 | if (p->net != net) | |
1286 | continue; | |
1287 | if ((p->dev && p->dev->ifindex == ifindex) || | |
1288 | (!p->dev && !ifindex)) | |
1289 | return p; | |
1290 | } | |
1291 | ||
1292 | return NULL; | |
1293 | } | |
1da177e4 LT |
1294 | |
1295 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1296 | struct neigh_table *tbl) | |
1297 | { | |
426b5303 EB |
1298 | struct neigh_parms *p, *ref; |
1299 | struct net *net; | |
1300 | ||
486b51d3 | 1301 | net = dev->nd_net; |
426b5303 EB |
1302 | ref = lookup_neigh_params(tbl, net, 0); |
1303 | if (!ref) | |
1304 | return NULL; | |
1da177e4 | 1305 | |
426b5303 | 1306 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1307 | if (p) { |
1da177e4 LT |
1308 | p->tbl = tbl; |
1309 | atomic_set(&p->refcnt, 1); | |
1310 | INIT_RCU_HEAD(&p->rcu_head); | |
1311 | p->reachable_time = | |
1312 | neigh_rand_reach_time(p->base_reachable_time); | |
c7fb64db | 1313 | |
486b51d3 DL |
1314 | if (dev->neigh_setup && dev->neigh_setup(dev, p)) { |
1315 | kfree(p); | |
1316 | return NULL; | |
1da177e4 | 1317 | } |
486b51d3 DL |
1318 | |
1319 | dev_hold(dev); | |
1320 | p->dev = dev; | |
426b5303 | 1321 | p->net = hold_net(net); |
1da177e4 LT |
1322 | p->sysctl_table = NULL; |
1323 | write_lock_bh(&tbl->lock); | |
1324 | p->next = tbl->parms.next; | |
1325 | tbl->parms.next = p; | |
1326 | write_unlock_bh(&tbl->lock); | |
1327 | } | |
1328 | return p; | |
1329 | } | |
1330 | ||
1331 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1332 | { | |
1333 | struct neigh_parms *parms = | |
1334 | container_of(head, struct neigh_parms, rcu_head); | |
1335 | ||
1336 | neigh_parms_put(parms); | |
1337 | } | |
1338 | ||
1339 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1340 | { | |
1341 | struct neigh_parms **p; | |
1342 | ||
1343 | if (!parms || parms == &tbl->parms) | |
1344 | return; | |
1345 | write_lock_bh(&tbl->lock); | |
1346 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { | |
1347 | if (*p == parms) { | |
1348 | *p = parms->next; | |
1349 | parms->dead = 1; | |
1350 | write_unlock_bh(&tbl->lock); | |
cecbb639 DM |
1351 | if (parms->dev) |
1352 | dev_put(parms->dev); | |
1da177e4 LT |
1353 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1354 | return; | |
1355 | } | |
1356 | } | |
1357 | write_unlock_bh(&tbl->lock); | |
1358 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); | |
1359 | } | |
1360 | ||
06f0511d | 1361 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1362 | { |
426b5303 | 1363 | release_net(parms->net); |
1da177e4 LT |
1364 | kfree(parms); |
1365 | } | |
1366 | ||
c2ecba71 PE |
1367 | static struct lock_class_key neigh_table_proxy_queue_class; |
1368 | ||
bd89efc5 | 1369 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
1da177e4 LT |
1370 | { |
1371 | unsigned long now = jiffies; | |
1372 | unsigned long phsize; | |
1373 | ||
426b5303 | 1374 | tbl->parms.net = &init_net; |
1da177e4 LT |
1375 | atomic_set(&tbl->parms.refcnt, 1); |
1376 | INIT_RCU_HEAD(&tbl->parms.rcu_head); | |
1377 | tbl->parms.reachable_time = | |
1378 | neigh_rand_reach_time(tbl->parms.base_reachable_time); | |
1379 | ||
1380 | if (!tbl->kmem_cachep) | |
e5d679f3 AD |
1381 | tbl->kmem_cachep = |
1382 | kmem_cache_create(tbl->id, tbl->entry_size, 0, | |
1383 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
20c2df83 | 1384 | NULL); |
1da177e4 LT |
1385 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1386 | if (!tbl->stats) | |
1387 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1388 | |
1da177e4 | 1389 | #ifdef CONFIG_PROC_FS |
457c4cbc | 1390 | tbl->pde = create_proc_entry(tbl->id, 0, init_net.proc_net_stat); |
4ec93edb | 1391 | if (!tbl->pde) |
1da177e4 LT |
1392 | panic("cannot create neighbour proc dir entry"); |
1393 | tbl->pde->proc_fops = &neigh_stat_seq_fops; | |
1394 | tbl->pde->data = tbl; | |
1395 | #endif | |
1396 | ||
1397 | tbl->hash_mask = 1; | |
1398 | tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1); | |
1399 | ||
1400 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1401 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 LT |
1402 | |
1403 | if (!tbl->hash_buckets || !tbl->phash_buckets) | |
1404 | panic("cannot allocate neighbour cache hashes"); | |
1405 | ||
1da177e4 LT |
1406 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
1407 | ||
1408 | rwlock_init(&tbl->lock); | |
b24b8a24 | 1409 | setup_timer(&tbl->gc_timer, neigh_periodic_timer, (unsigned long)tbl); |
1da177e4 LT |
1410 | tbl->gc_timer.expires = now + 1; |
1411 | add_timer(&tbl->gc_timer); | |
1412 | ||
b24b8a24 | 1413 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1414 | skb_queue_head_init_class(&tbl->proxy_queue, |
1415 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1416 | |
1417 | tbl->last_flush = now; | |
1418 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 SK |
1419 | } |
1420 | ||
1421 | void neigh_table_init(struct neigh_table *tbl) | |
1422 | { | |
1423 | struct neigh_table *tmp; | |
1424 | ||
1425 | neigh_table_init_no_netlink(tbl); | |
1da177e4 | 1426 | write_lock(&neigh_tbl_lock); |
bd89efc5 SK |
1427 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
1428 | if (tmp->family == tbl->family) | |
1429 | break; | |
1430 | } | |
1da177e4 LT |
1431 | tbl->next = neigh_tables; |
1432 | neigh_tables = tbl; | |
1433 | write_unlock(&neigh_tbl_lock); | |
bd89efc5 SK |
1434 | |
1435 | if (unlikely(tmp)) { | |
1436 | printk(KERN_ERR "NEIGH: Registering multiple tables for " | |
1437 | "family %d\n", tbl->family); | |
1438 | dump_stack(); | |
1439 | } | |
1da177e4 LT |
1440 | } |
1441 | ||
1442 | int neigh_table_clear(struct neigh_table *tbl) | |
1443 | { | |
1444 | struct neigh_table **tp; | |
1445 | ||
1446 | /* It is not clean... Fix it to unload IPv6 module safely */ | |
1447 | del_timer_sync(&tbl->gc_timer); | |
1448 | del_timer_sync(&tbl->proxy_timer); | |
1449 | pneigh_queue_purge(&tbl->proxy_queue); | |
1450 | neigh_ifdown(tbl, NULL); | |
1451 | if (atomic_read(&tbl->entries)) | |
1452 | printk(KERN_CRIT "neighbour leakage\n"); | |
1453 | write_lock(&neigh_tbl_lock); | |
1454 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { | |
1455 | if (*tp == tbl) { | |
1456 | *tp = tbl->next; | |
1457 | break; | |
1458 | } | |
1459 | } | |
1460 | write_unlock(&neigh_tbl_lock); | |
1461 | ||
1462 | neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1); | |
1463 | tbl->hash_buckets = NULL; | |
1464 | ||
1465 | kfree(tbl->phash_buckets); | |
1466 | tbl->phash_buckets = NULL; | |
1467 | ||
3f192b5c AD |
1468 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1469 | ||
3fcde74b KK |
1470 | free_percpu(tbl->stats); |
1471 | tbl->stats = NULL; | |
1472 | ||
bfb85c9f RD |
1473 | kmem_cache_destroy(tbl->kmem_cachep); |
1474 | tbl->kmem_cachep = NULL; | |
1475 | ||
1da177e4 LT |
1476 | return 0; |
1477 | } | |
1478 | ||
c8822a4e | 1479 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1480 | { |
881d966b | 1481 | struct net *net = skb->sk->sk_net; |
a14a49d2 TG |
1482 | struct ndmsg *ndm; |
1483 | struct nlattr *dst_attr; | |
1da177e4 LT |
1484 | struct neigh_table *tbl; |
1485 | struct net_device *dev = NULL; | |
a14a49d2 | 1486 | int err = -EINVAL; |
1da177e4 | 1487 | |
a14a49d2 | 1488 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1489 | goto out; |
1490 | ||
a14a49d2 TG |
1491 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1492 | if (dst_attr == NULL) | |
1493 | goto out; | |
1494 | ||
1495 | ndm = nlmsg_data(nlh); | |
1496 | if (ndm->ndm_ifindex) { | |
881d966b | 1497 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1498 | if (dev == NULL) { |
1499 | err = -ENODEV; | |
1500 | goto out; | |
1501 | } | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | read_lock(&neigh_tbl_lock); |
1505 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
a14a49d2 | 1506 | struct neighbour *neigh; |
1da177e4 LT |
1507 | |
1508 | if (tbl->family != ndm->ndm_family) | |
1509 | continue; | |
1510 | read_unlock(&neigh_tbl_lock); | |
1511 | ||
a14a49d2 | 1512 | if (nla_len(dst_attr) < tbl->key_len) |
1da177e4 LT |
1513 | goto out_dev_put; |
1514 | ||
1515 | if (ndm->ndm_flags & NTF_PROXY) { | |
426b5303 | 1516 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
1da177e4 LT |
1517 | goto out_dev_put; |
1518 | } | |
1519 | ||
a14a49d2 TG |
1520 | if (dev == NULL) |
1521 | goto out_dev_put; | |
1da177e4 | 1522 | |
a14a49d2 TG |
1523 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1524 | if (neigh == NULL) { | |
1525 | err = -ENOENT; | |
1526 | goto out_dev_put; | |
1da177e4 | 1527 | } |
a14a49d2 TG |
1528 | |
1529 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1530 | NEIGH_UPDATE_F_OVERRIDE | | |
1531 | NEIGH_UPDATE_F_ADMIN); | |
1532 | neigh_release(neigh); | |
1da177e4 LT |
1533 | goto out_dev_put; |
1534 | } | |
1535 | read_unlock(&neigh_tbl_lock); | |
a14a49d2 TG |
1536 | err = -EAFNOSUPPORT; |
1537 | ||
1da177e4 LT |
1538 | out_dev_put: |
1539 | if (dev) | |
1540 | dev_put(dev); | |
1541 | out: | |
1542 | return err; | |
1543 | } | |
1544 | ||
c8822a4e | 1545 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1546 | { |
881d966b | 1547 | struct net *net = skb->sk->sk_net; |
5208debd TG |
1548 | struct ndmsg *ndm; |
1549 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1550 | struct neigh_table *tbl; |
1551 | struct net_device *dev = NULL; | |
5208debd | 1552 | int err; |
1da177e4 | 1553 | |
5208debd TG |
1554 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1555 | if (err < 0) | |
1da177e4 LT |
1556 | goto out; |
1557 | ||
5208debd TG |
1558 | err = -EINVAL; |
1559 | if (tb[NDA_DST] == NULL) | |
1560 | goto out; | |
1561 | ||
1562 | ndm = nlmsg_data(nlh); | |
1563 | if (ndm->ndm_ifindex) { | |
881d966b | 1564 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1565 | if (dev == NULL) { |
1566 | err = -ENODEV; | |
1567 | goto out; | |
1568 | } | |
1569 | ||
1570 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
1571 | goto out_dev_put; | |
1572 | } | |
1573 | ||
1da177e4 LT |
1574 | read_lock(&neigh_tbl_lock); |
1575 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
5208debd TG |
1576 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
1577 | struct neighbour *neigh; | |
1578 | void *dst, *lladdr; | |
1da177e4 LT |
1579 | |
1580 | if (tbl->family != ndm->ndm_family) | |
1581 | continue; | |
1582 | read_unlock(&neigh_tbl_lock); | |
1583 | ||
5208debd | 1584 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1da177e4 | 1585 | goto out_dev_put; |
5208debd TG |
1586 | dst = nla_data(tb[NDA_DST]); |
1587 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 LT |
1588 | |
1589 | if (ndm->ndm_flags & NTF_PROXY) { | |
62dd9318 VN |
1590 | struct pneigh_entry *pn; |
1591 | ||
1592 | err = -ENOBUFS; | |
426b5303 | 1593 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
62dd9318 VN |
1594 | if (pn) { |
1595 | pn->flags = ndm->ndm_flags; | |
1596 | err = 0; | |
1597 | } | |
1da177e4 LT |
1598 | goto out_dev_put; |
1599 | } | |
1600 | ||
5208debd | 1601 | if (dev == NULL) |
1da177e4 | 1602 | goto out_dev_put; |
5208debd TG |
1603 | |
1604 | neigh = neigh_lookup(tbl, dst, dev); | |
1605 | if (neigh == NULL) { | |
1606 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1607 | err = -ENOENT; | |
1608 | goto out_dev_put; | |
1609 | } | |
4ec93edb | 1610 | |
5208debd TG |
1611 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1612 | if (IS_ERR(neigh)) { | |
1613 | err = PTR_ERR(neigh); | |
1da177e4 LT |
1614 | goto out_dev_put; |
1615 | } | |
1da177e4 | 1616 | } else { |
5208debd TG |
1617 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1618 | err = -EEXIST; | |
1619 | neigh_release(neigh); | |
1da177e4 LT |
1620 | goto out_dev_put; |
1621 | } | |
1da177e4 | 1622 | |
5208debd TG |
1623 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1624 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1625 | } | |
1da177e4 | 1626 | |
5208debd TG |
1627 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); |
1628 | neigh_release(neigh); | |
1da177e4 LT |
1629 | goto out_dev_put; |
1630 | } | |
1631 | ||
1632 | read_unlock(&neigh_tbl_lock); | |
5208debd TG |
1633 | err = -EAFNOSUPPORT; |
1634 | ||
1da177e4 LT |
1635 | out_dev_put: |
1636 | if (dev) | |
1637 | dev_put(dev); | |
1638 | out: | |
1639 | return err; | |
1640 | } | |
1641 | ||
c7fb64db TG |
1642 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1643 | { | |
ca860fb3 TG |
1644 | struct nlattr *nest; |
1645 | ||
1646 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1647 | if (nest == NULL) | |
1648 | return -ENOBUFS; | |
c7fb64db TG |
1649 | |
1650 | if (parms->dev) | |
ca860fb3 TG |
1651 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
1652 | ||
1653 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); | |
1654 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); | |
1655 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); | |
1656 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); | |
1657 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); | |
1658 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); | |
1659 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); | |
1660 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, | |
c7fb64db | 1661 | parms->base_reachable_time); |
ca860fb3 TG |
1662 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
1663 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); | |
1664 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); | |
1665 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); | |
1666 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); | |
1667 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); | |
c7fb64db | 1668 | |
ca860fb3 | 1669 | return nla_nest_end(skb, nest); |
c7fb64db | 1670 | |
ca860fb3 TG |
1671 | nla_put_failure: |
1672 | return nla_nest_cancel(skb, nest); | |
c7fb64db TG |
1673 | } |
1674 | ||
ca860fb3 TG |
1675 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1676 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1677 | { |
1678 | struct nlmsghdr *nlh; | |
1679 | struct ndtmsg *ndtmsg; | |
1680 | ||
ca860fb3 TG |
1681 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1682 | if (nlh == NULL) | |
26932566 | 1683 | return -EMSGSIZE; |
c7fb64db | 1684 | |
ca860fb3 | 1685 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1686 | |
1687 | read_lock_bh(&tbl->lock); | |
1688 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1689 | ndtmsg->ndtm_pad1 = 0; |
1690 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1691 | |
ca860fb3 TG |
1692 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
1693 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); | |
1694 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); | |
1695 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); | |
1696 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); | |
c7fb64db TG |
1697 | |
1698 | { | |
1699 | unsigned long now = jiffies; | |
1700 | unsigned int flush_delta = now - tbl->last_flush; | |
1701 | unsigned int rand_delta = now - tbl->last_rand; | |
1702 | ||
1703 | struct ndt_config ndc = { | |
1704 | .ndtc_key_len = tbl->key_len, | |
1705 | .ndtc_entry_size = tbl->entry_size, | |
1706 | .ndtc_entries = atomic_read(&tbl->entries), | |
1707 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1708 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
1709 | .ndtc_hash_rnd = tbl->hash_rnd, | |
1710 | .ndtc_hash_mask = tbl->hash_mask, | |
1711 | .ndtc_hash_chain_gc = tbl->hash_chain_gc, | |
1712 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, | |
1713 | }; | |
1714 | ||
ca860fb3 | 1715 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
c7fb64db TG |
1716 | } |
1717 | ||
1718 | { | |
1719 | int cpu; | |
1720 | struct ndt_stats ndst; | |
1721 | ||
1722 | memset(&ndst, 0, sizeof(ndst)); | |
1723 | ||
6f912042 | 1724 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1725 | struct neigh_statistics *st; |
1726 | ||
c7fb64db TG |
1727 | st = per_cpu_ptr(tbl->stats, cpu); |
1728 | ndst.ndts_allocs += st->allocs; | |
1729 | ndst.ndts_destroys += st->destroys; | |
1730 | ndst.ndts_hash_grows += st->hash_grows; | |
1731 | ndst.ndts_res_failed += st->res_failed; | |
1732 | ndst.ndts_lookups += st->lookups; | |
1733 | ndst.ndts_hits += st->hits; | |
1734 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1735 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1736 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1737 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1738 | } | |
1739 | ||
ca860fb3 | 1740 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
c7fb64db TG |
1741 | } |
1742 | ||
1743 | BUG_ON(tbl->parms.dev); | |
1744 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1745 | goto nla_put_failure; |
c7fb64db TG |
1746 | |
1747 | read_unlock_bh(&tbl->lock); | |
ca860fb3 | 1748 | return nlmsg_end(skb, nlh); |
c7fb64db | 1749 | |
ca860fb3 | 1750 | nla_put_failure: |
c7fb64db | 1751 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1752 | nlmsg_cancel(skb, nlh); |
1753 | return -EMSGSIZE; | |
c7fb64db TG |
1754 | } |
1755 | ||
ca860fb3 TG |
1756 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1757 | struct neigh_table *tbl, | |
c7fb64db | 1758 | struct neigh_parms *parms, |
ca860fb3 TG |
1759 | u32 pid, u32 seq, int type, |
1760 | unsigned int flags) | |
c7fb64db TG |
1761 | { |
1762 | struct ndtmsg *ndtmsg; | |
1763 | struct nlmsghdr *nlh; | |
1764 | ||
ca860fb3 TG |
1765 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1766 | if (nlh == NULL) | |
26932566 | 1767 | return -EMSGSIZE; |
c7fb64db | 1768 | |
ca860fb3 | 1769 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1770 | |
1771 | read_lock_bh(&tbl->lock); | |
1772 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1773 | ndtmsg->ndtm_pad1 = 0; |
1774 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1775 | |
ca860fb3 TG |
1776 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1777 | neightbl_fill_parms(skb, parms) < 0) | |
1778 | goto errout; | |
c7fb64db TG |
1779 | |
1780 | read_unlock_bh(&tbl->lock); | |
ca860fb3 TG |
1781 | return nlmsg_end(skb, nlh); |
1782 | errout: | |
c7fb64db | 1783 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1784 | nlmsg_cancel(skb, nlh); |
1785 | return -EMSGSIZE; | |
c7fb64db | 1786 | } |
4ec93edb | 1787 | |
ef7c79ed | 1788 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1789 | [NDTA_NAME] = { .type = NLA_STRING }, |
1790 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1791 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1792 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1793 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1794 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1795 | }; | |
1796 | ||
ef7c79ed | 1797 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1798 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1799 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1800 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1801 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1802 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1803 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
1804 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1805 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1806 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1807 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1808 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1809 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1810 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1811 | }; | |
1812 | ||
c8822a4e | 1813 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
c7fb64db | 1814 | { |
b854272b | 1815 | struct net *net = skb->sk->sk_net; |
c7fb64db | 1816 | struct neigh_table *tbl; |
6b3f8674 TG |
1817 | struct ndtmsg *ndtmsg; |
1818 | struct nlattr *tb[NDTA_MAX+1]; | |
1819 | int err; | |
c7fb64db | 1820 | |
6b3f8674 TG |
1821 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1822 | nl_neightbl_policy); | |
1823 | if (err < 0) | |
1824 | goto errout; | |
c7fb64db | 1825 | |
6b3f8674 TG |
1826 | if (tb[NDTA_NAME] == NULL) { |
1827 | err = -EINVAL; | |
1828 | goto errout; | |
1829 | } | |
1830 | ||
1831 | ndtmsg = nlmsg_data(nlh); | |
c7fb64db TG |
1832 | read_lock(&neigh_tbl_lock); |
1833 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
1834 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) | |
1835 | continue; | |
1836 | ||
6b3f8674 | 1837 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
c7fb64db TG |
1838 | break; |
1839 | } | |
1840 | ||
1841 | if (tbl == NULL) { | |
1842 | err = -ENOENT; | |
6b3f8674 | 1843 | goto errout_locked; |
c7fb64db TG |
1844 | } |
1845 | ||
4ec93edb | 1846 | /* |
c7fb64db TG |
1847 | * We acquire tbl->lock to be nice to the periodic timers and |
1848 | * make sure they always see a consistent set of values. | |
1849 | */ | |
1850 | write_lock_bh(&tbl->lock); | |
1851 | ||
6b3f8674 TG |
1852 | if (tb[NDTA_PARMS]) { |
1853 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1854 | struct neigh_parms *p; |
6b3f8674 | 1855 | int i, ifindex = 0; |
c7fb64db | 1856 | |
6b3f8674 TG |
1857 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1858 | nl_ntbl_parm_policy); | |
1859 | if (err < 0) | |
1860 | goto errout_tbl_lock; | |
c7fb64db | 1861 | |
6b3f8674 TG |
1862 | if (tbp[NDTPA_IFINDEX]) |
1863 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1864 | |
426b5303 | 1865 | p = lookup_neigh_params(tbl, net, ifindex); |
c7fb64db TG |
1866 | if (p == NULL) { |
1867 | err = -ENOENT; | |
6b3f8674 | 1868 | goto errout_tbl_lock; |
c7fb64db | 1869 | } |
c7fb64db | 1870 | |
6b3f8674 TG |
1871 | for (i = 1; i <= NDTPA_MAX; i++) { |
1872 | if (tbp[i] == NULL) | |
1873 | continue; | |
c7fb64db | 1874 | |
6b3f8674 TG |
1875 | switch (i) { |
1876 | case NDTPA_QUEUE_LEN: | |
1877 | p->queue_len = nla_get_u32(tbp[i]); | |
1878 | break; | |
1879 | case NDTPA_PROXY_QLEN: | |
1880 | p->proxy_qlen = nla_get_u32(tbp[i]); | |
1881 | break; | |
1882 | case NDTPA_APP_PROBES: | |
1883 | p->app_probes = nla_get_u32(tbp[i]); | |
1884 | break; | |
1885 | case NDTPA_UCAST_PROBES: | |
1886 | p->ucast_probes = nla_get_u32(tbp[i]); | |
1887 | break; | |
1888 | case NDTPA_MCAST_PROBES: | |
1889 | p->mcast_probes = nla_get_u32(tbp[i]); | |
1890 | break; | |
1891 | case NDTPA_BASE_REACHABLE_TIME: | |
1892 | p->base_reachable_time = nla_get_msecs(tbp[i]); | |
1893 | break; | |
1894 | case NDTPA_GC_STALETIME: | |
1895 | p->gc_staletime = nla_get_msecs(tbp[i]); | |
1896 | break; | |
1897 | case NDTPA_DELAY_PROBE_TIME: | |
1898 | p->delay_probe_time = nla_get_msecs(tbp[i]); | |
1899 | break; | |
1900 | case NDTPA_RETRANS_TIME: | |
1901 | p->retrans_time = nla_get_msecs(tbp[i]); | |
1902 | break; | |
1903 | case NDTPA_ANYCAST_DELAY: | |
1904 | p->anycast_delay = nla_get_msecs(tbp[i]); | |
1905 | break; | |
1906 | case NDTPA_PROXY_DELAY: | |
1907 | p->proxy_delay = nla_get_msecs(tbp[i]); | |
1908 | break; | |
1909 | case NDTPA_LOCKTIME: | |
1910 | p->locktime = nla_get_msecs(tbp[i]); | |
1911 | break; | |
1912 | } | |
1913 | } | |
1914 | } | |
c7fb64db | 1915 | |
6b3f8674 TG |
1916 | if (tb[NDTA_THRESH1]) |
1917 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 1918 | |
6b3f8674 TG |
1919 | if (tb[NDTA_THRESH2]) |
1920 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 1921 | |
6b3f8674 TG |
1922 | if (tb[NDTA_THRESH3]) |
1923 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 1924 | |
6b3f8674 TG |
1925 | if (tb[NDTA_GC_INTERVAL]) |
1926 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
1927 | |
1928 | err = 0; | |
1929 | ||
6b3f8674 | 1930 | errout_tbl_lock: |
c7fb64db | 1931 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 1932 | errout_locked: |
c7fb64db | 1933 | read_unlock(&neigh_tbl_lock); |
6b3f8674 | 1934 | errout: |
c7fb64db TG |
1935 | return err; |
1936 | } | |
1937 | ||
c8822a4e | 1938 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 1939 | { |
b854272b | 1940 | struct net *net = skb->sk->sk_net; |
ca860fb3 TG |
1941 | int family, tidx, nidx = 0; |
1942 | int tbl_skip = cb->args[0]; | |
1943 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
1944 | struct neigh_table *tbl; |
1945 | ||
ca860fb3 | 1946 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db TG |
1947 | |
1948 | read_lock(&neigh_tbl_lock); | |
ca860fb3 | 1949 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
c7fb64db TG |
1950 | struct neigh_parms *p; |
1951 | ||
ca860fb3 | 1952 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
1953 | continue; |
1954 | ||
ca860fb3 TG |
1955 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
1956 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, | |
1957 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1958 | break; |
1959 | ||
426b5303 EB |
1960 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
1961 | if (net != p->net) | |
1962 | continue; | |
1963 | ||
1964 | if (nidx++ < neigh_skip) | |
c7fb64db TG |
1965 | continue; |
1966 | ||
ca860fb3 TG |
1967 | if (neightbl_fill_param_info(skb, tbl, p, |
1968 | NETLINK_CB(cb->skb).pid, | |
1969 | cb->nlh->nlmsg_seq, | |
1970 | RTM_NEWNEIGHTBL, | |
1971 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1972 | goto out; |
1973 | } | |
1974 | ||
ca860fb3 | 1975 | neigh_skip = 0; |
c7fb64db TG |
1976 | } |
1977 | out: | |
1978 | read_unlock(&neigh_tbl_lock); | |
ca860fb3 TG |
1979 | cb->args[0] = tidx; |
1980 | cb->args[1] = nidx; | |
c7fb64db TG |
1981 | |
1982 | return skb->len; | |
1983 | } | |
1da177e4 | 1984 | |
8b8aec50 TG |
1985 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
1986 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
1987 | { |
1988 | unsigned long now = jiffies; | |
1da177e4 | 1989 | struct nda_cacheinfo ci; |
8b8aec50 TG |
1990 | struct nlmsghdr *nlh; |
1991 | struct ndmsg *ndm; | |
1992 | ||
1993 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
1994 | if (nlh == NULL) | |
26932566 | 1995 | return -EMSGSIZE; |
1da177e4 | 1996 | |
8b8aec50 TG |
1997 | ndm = nlmsg_data(nlh); |
1998 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
1999 | ndm->ndm_pad1 = 0; |
2000 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2001 | ndm->ndm_flags = neigh->flags; |
2002 | ndm->ndm_type = neigh->type; | |
2003 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2004 | |
8b8aec50 TG |
2005 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
2006 | ||
2007 | read_lock_bh(&neigh->lock); | |
2008 | ndm->ndm_state = neigh->nud_state; | |
2009 | if ((neigh->nud_state & NUD_VALID) && | |
2010 | nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, neigh->ha) < 0) { | |
2011 | read_unlock_bh(&neigh->lock); | |
2012 | goto nla_put_failure; | |
2013 | } | |
2014 | ||
2015 | ci.ndm_used = now - neigh->used; | |
2016 | ci.ndm_confirmed = now - neigh->confirmed; | |
2017 | ci.ndm_updated = now - neigh->updated; | |
2018 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; | |
2019 | read_unlock_bh(&neigh->lock); | |
2020 | ||
2021 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); | |
2022 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); | |
2023 | ||
2024 | return nlmsg_end(skb, nlh); | |
2025 | ||
2026 | nla_put_failure: | |
26932566 PM |
2027 | nlmsg_cancel(skb, nlh); |
2028 | return -EMSGSIZE; | |
1da177e4 LT |
2029 | } |
2030 | ||
d961db35 TG |
2031 | static void neigh_update_notify(struct neighbour *neigh) |
2032 | { | |
2033 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2034 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2035 | } | |
1da177e4 LT |
2036 | |
2037 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2038 | struct netlink_callback *cb) | |
2039 | { | |
426b5303 | 2040 | struct net * net = skb->sk->sk_net; |
1da177e4 LT |
2041 | struct neighbour *n; |
2042 | int rc, h, s_h = cb->args[1]; | |
2043 | int idx, s_idx = idx = cb->args[2]; | |
2044 | ||
c5e29460 | 2045 | read_lock_bh(&tbl->lock); |
1da177e4 LT |
2046 | for (h = 0; h <= tbl->hash_mask; h++) { |
2047 | if (h < s_h) | |
2048 | continue; | |
2049 | if (h > s_h) | |
2050 | s_idx = 0; | |
426b5303 EB |
2051 | for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next) { |
2052 | int lidx; | |
2053 | if (n->dev->nd_net != net) | |
2054 | continue; | |
2055 | lidx = idx++; | |
2056 | if (lidx < s_idx) | |
1da177e4 LT |
2057 | continue; |
2058 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, | |
2059 | cb->nlh->nlmsg_seq, | |
b6544c0b JHS |
2060 | RTM_NEWNEIGH, |
2061 | NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2062 | read_unlock_bh(&tbl->lock); |
2063 | rc = -1; | |
2064 | goto out; | |
2065 | } | |
2066 | } | |
1da177e4 | 2067 | } |
c5e29460 | 2068 | read_unlock_bh(&tbl->lock); |
1da177e4 LT |
2069 | rc = skb->len; |
2070 | out: | |
2071 | cb->args[1] = h; | |
2072 | cb->args[2] = idx; | |
2073 | return rc; | |
2074 | } | |
2075 | ||
c8822a4e | 2076 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2077 | { |
2078 | struct neigh_table *tbl; | |
2079 | int t, family, s_t; | |
2080 | ||
2081 | read_lock(&neigh_tbl_lock); | |
8b8aec50 | 2082 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
1da177e4 LT |
2083 | s_t = cb->args[0]; |
2084 | ||
2085 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { | |
2086 | if (t < s_t || (family && tbl->family != family)) | |
2087 | continue; | |
2088 | if (t > s_t) | |
2089 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2090 | sizeof(cb->args[0])); | |
2091 | if (neigh_dump_table(tbl, skb, cb) < 0) | |
2092 | break; | |
2093 | } | |
2094 | read_unlock(&neigh_tbl_lock); | |
2095 | ||
2096 | cb->args[0] = t; | |
2097 | return skb->len; | |
2098 | } | |
2099 | ||
2100 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2101 | { | |
2102 | int chain; | |
2103 | ||
2104 | read_lock_bh(&tbl->lock); | |
2105 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2106 | struct neighbour *n; | |
2107 | ||
2108 | for (n = tbl->hash_buckets[chain]; n; n = n->next) | |
2109 | cb(n, cookie); | |
2110 | } | |
2111 | read_unlock_bh(&tbl->lock); | |
2112 | } | |
2113 | EXPORT_SYMBOL(neigh_for_each); | |
2114 | ||
2115 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2116 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2117 | int (*cb)(struct neighbour *)) | |
2118 | { | |
2119 | int chain; | |
2120 | ||
2121 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2122 | struct neighbour *n, **np; | |
2123 | ||
2124 | np = &tbl->hash_buckets[chain]; | |
2125 | while ((n = *np) != NULL) { | |
2126 | int release; | |
2127 | ||
2128 | write_lock(&n->lock); | |
2129 | release = cb(n); | |
2130 | if (release) { | |
2131 | *np = n->next; | |
2132 | n->dead = 1; | |
2133 | } else | |
2134 | np = &n->next; | |
2135 | write_unlock(&n->lock); | |
4f494554 TG |
2136 | if (release) |
2137 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2138 | } |
2139 | } | |
2140 | } | |
2141 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2142 | ||
2143 | #ifdef CONFIG_PROC_FS | |
2144 | ||
2145 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2146 | { | |
2147 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2148 | struct net *net = state->p.net; |
1da177e4 LT |
2149 | struct neigh_table *tbl = state->tbl; |
2150 | struct neighbour *n = NULL; | |
2151 | int bucket = state->bucket; | |
2152 | ||
2153 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
2154 | for (bucket = 0; bucket <= tbl->hash_mask; bucket++) { | |
2155 | n = tbl->hash_buckets[bucket]; | |
2156 | ||
2157 | while (n) { | |
426b5303 EB |
2158 | if (n->dev->nd_net != net) |
2159 | goto next; | |
1da177e4 LT |
2160 | if (state->neigh_sub_iter) { |
2161 | loff_t fakep = 0; | |
2162 | void *v; | |
2163 | ||
2164 | v = state->neigh_sub_iter(state, n, &fakep); | |
2165 | if (!v) | |
2166 | goto next; | |
2167 | } | |
2168 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2169 | break; | |
2170 | if (n->nud_state & ~NUD_NOARP) | |
2171 | break; | |
2172 | next: | |
2173 | n = n->next; | |
2174 | } | |
2175 | ||
2176 | if (n) | |
2177 | break; | |
2178 | } | |
2179 | state->bucket = bucket; | |
2180 | ||
2181 | return n; | |
2182 | } | |
2183 | ||
2184 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2185 | struct neighbour *n, | |
2186 | loff_t *pos) | |
2187 | { | |
2188 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2189 | struct net *net = state->p.net; |
1da177e4 LT |
2190 | struct neigh_table *tbl = state->tbl; |
2191 | ||
2192 | if (state->neigh_sub_iter) { | |
2193 | void *v = state->neigh_sub_iter(state, n, pos); | |
2194 | if (v) | |
2195 | return n; | |
2196 | } | |
2197 | n = n->next; | |
2198 | ||
2199 | while (1) { | |
2200 | while (n) { | |
426b5303 EB |
2201 | if (n->dev->nd_net != net) |
2202 | goto next; | |
1da177e4 LT |
2203 | if (state->neigh_sub_iter) { |
2204 | void *v = state->neigh_sub_iter(state, n, pos); | |
2205 | if (v) | |
2206 | return n; | |
2207 | goto next; | |
2208 | } | |
2209 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2210 | break; | |
2211 | ||
2212 | if (n->nud_state & ~NUD_NOARP) | |
2213 | break; | |
2214 | next: | |
2215 | n = n->next; | |
2216 | } | |
2217 | ||
2218 | if (n) | |
2219 | break; | |
2220 | ||
2221 | if (++state->bucket > tbl->hash_mask) | |
2222 | break; | |
2223 | ||
2224 | n = tbl->hash_buckets[state->bucket]; | |
2225 | } | |
2226 | ||
2227 | if (n && pos) | |
2228 | --(*pos); | |
2229 | return n; | |
2230 | } | |
2231 | ||
2232 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2233 | { | |
2234 | struct neighbour *n = neigh_get_first(seq); | |
2235 | ||
2236 | if (n) { | |
2237 | while (*pos) { | |
2238 | n = neigh_get_next(seq, n, pos); | |
2239 | if (!n) | |
2240 | break; | |
2241 | } | |
2242 | } | |
2243 | return *pos ? NULL : n; | |
2244 | } | |
2245 | ||
2246 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2247 | { | |
2248 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2249 | struct net * net = state->p.net; |
1da177e4 LT |
2250 | struct neigh_table *tbl = state->tbl; |
2251 | struct pneigh_entry *pn = NULL; | |
2252 | int bucket = state->bucket; | |
2253 | ||
2254 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2255 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2256 | pn = tbl->phash_buckets[bucket]; | |
426b5303 EB |
2257 | while (pn && (pn->net != net)) |
2258 | pn = pn->next; | |
1da177e4 LT |
2259 | if (pn) |
2260 | break; | |
2261 | } | |
2262 | state->bucket = bucket; | |
2263 | ||
2264 | return pn; | |
2265 | } | |
2266 | ||
2267 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2268 | struct pneigh_entry *pn, | |
2269 | loff_t *pos) | |
2270 | { | |
2271 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2272 | struct net * net = state->p.net; |
1da177e4 LT |
2273 | struct neigh_table *tbl = state->tbl; |
2274 | ||
2275 | pn = pn->next; | |
2276 | while (!pn) { | |
2277 | if (++state->bucket > PNEIGH_HASHMASK) | |
2278 | break; | |
2279 | pn = tbl->phash_buckets[state->bucket]; | |
426b5303 EB |
2280 | while (pn && (pn->net != net)) |
2281 | pn = pn->next; | |
1da177e4 LT |
2282 | if (pn) |
2283 | break; | |
2284 | } | |
2285 | ||
2286 | if (pn && pos) | |
2287 | --(*pos); | |
2288 | ||
2289 | return pn; | |
2290 | } | |
2291 | ||
2292 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2293 | { | |
2294 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2295 | ||
2296 | if (pn) { | |
2297 | while (*pos) { | |
2298 | pn = pneigh_get_next(seq, pn, pos); | |
2299 | if (!pn) | |
2300 | break; | |
2301 | } | |
2302 | } | |
2303 | return *pos ? NULL : pn; | |
2304 | } | |
2305 | ||
2306 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2307 | { | |
2308 | struct neigh_seq_state *state = seq->private; | |
2309 | void *rc; | |
2310 | ||
2311 | rc = neigh_get_idx(seq, pos); | |
2312 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2313 | rc = pneigh_get_idx(seq, pos); | |
2314 | ||
2315 | return rc; | |
2316 | } | |
2317 | ||
2318 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
9a429c49 | 2319 | __acquires(tbl->lock) |
1da177e4 LT |
2320 | { |
2321 | struct neigh_seq_state *state = seq->private; | |
2322 | loff_t pos_minus_one; | |
2323 | ||
2324 | state->tbl = tbl; | |
2325 | state->bucket = 0; | |
2326 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2327 | ||
2328 | read_lock_bh(&tbl->lock); | |
2329 | ||
2330 | pos_minus_one = *pos - 1; | |
2331 | return *pos ? neigh_get_idx_any(seq, &pos_minus_one) : SEQ_START_TOKEN; | |
2332 | } | |
2333 | EXPORT_SYMBOL(neigh_seq_start); | |
2334 | ||
2335 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2336 | { | |
2337 | struct neigh_seq_state *state; | |
2338 | void *rc; | |
2339 | ||
2340 | if (v == SEQ_START_TOKEN) { | |
2341 | rc = neigh_get_idx(seq, pos); | |
2342 | goto out; | |
2343 | } | |
2344 | ||
2345 | state = seq->private; | |
2346 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2347 | rc = neigh_get_next(seq, v, NULL); | |
2348 | if (rc) | |
2349 | goto out; | |
2350 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2351 | rc = pneigh_get_first(seq); | |
2352 | } else { | |
2353 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2354 | rc = pneigh_get_next(seq, v, NULL); | |
2355 | } | |
2356 | out: | |
2357 | ++(*pos); | |
2358 | return rc; | |
2359 | } | |
2360 | EXPORT_SYMBOL(neigh_seq_next); | |
2361 | ||
2362 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2363 | __releases(tbl->lock) |
1da177e4 LT |
2364 | { |
2365 | struct neigh_seq_state *state = seq->private; | |
2366 | struct neigh_table *tbl = state->tbl; | |
2367 | ||
2368 | read_unlock_bh(&tbl->lock); | |
2369 | } | |
2370 | EXPORT_SYMBOL(neigh_seq_stop); | |
2371 | ||
2372 | /* statistics via seq_file */ | |
2373 | ||
2374 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2375 | { | |
2376 | struct proc_dir_entry *pde = seq->private; | |
2377 | struct neigh_table *tbl = pde->data; | |
2378 | int cpu; | |
2379 | ||
2380 | if (*pos == 0) | |
2381 | return SEQ_START_TOKEN; | |
4ec93edb | 2382 | |
1da177e4 LT |
2383 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { |
2384 | if (!cpu_possible(cpu)) | |
2385 | continue; | |
2386 | *pos = cpu+1; | |
2387 | return per_cpu_ptr(tbl->stats, cpu); | |
2388 | } | |
2389 | return NULL; | |
2390 | } | |
2391 | ||
2392 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2393 | { | |
2394 | struct proc_dir_entry *pde = seq->private; | |
2395 | struct neigh_table *tbl = pde->data; | |
2396 | int cpu; | |
2397 | ||
2398 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
2399 | if (!cpu_possible(cpu)) | |
2400 | continue; | |
2401 | *pos = cpu+1; | |
2402 | return per_cpu_ptr(tbl->stats, cpu); | |
2403 | } | |
2404 | return NULL; | |
2405 | } | |
2406 | ||
2407 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2408 | { | |
2409 | ||
2410 | } | |
2411 | ||
2412 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2413 | { | |
2414 | struct proc_dir_entry *pde = seq->private; | |
2415 | struct neigh_table *tbl = pde->data; | |
2416 | struct neigh_statistics *st = v; | |
2417 | ||
2418 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 2419 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs\n"); |
1da177e4 LT |
2420 | return 0; |
2421 | } | |
2422 | ||
2423 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
2424 | "%08lx %08lx %08lx %08lx\n", | |
2425 | atomic_read(&tbl->entries), | |
2426 | ||
2427 | st->allocs, | |
2428 | st->destroys, | |
2429 | st->hash_grows, | |
2430 | ||
2431 | st->lookups, | |
2432 | st->hits, | |
2433 | ||
2434 | st->res_failed, | |
2435 | ||
2436 | st->rcv_probes_mcast, | |
2437 | st->rcv_probes_ucast, | |
2438 | ||
2439 | st->periodic_gc_runs, | |
2440 | st->forced_gc_runs | |
2441 | ); | |
2442 | ||
2443 | return 0; | |
2444 | } | |
2445 | ||
f690808e | 2446 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2447 | .start = neigh_stat_seq_start, |
2448 | .next = neigh_stat_seq_next, | |
2449 | .stop = neigh_stat_seq_stop, | |
2450 | .show = neigh_stat_seq_show, | |
2451 | }; | |
2452 | ||
2453 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2454 | { | |
2455 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2456 | ||
2457 | if (!ret) { | |
2458 | struct seq_file *sf = file->private_data; | |
2459 | sf->private = PDE(inode); | |
2460 | } | |
2461 | return ret; | |
2462 | }; | |
2463 | ||
9a32144e | 2464 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2465 | .owner = THIS_MODULE, |
2466 | .open = neigh_stat_seq_open, | |
2467 | .read = seq_read, | |
2468 | .llseek = seq_lseek, | |
2469 | .release = seq_release, | |
2470 | }; | |
2471 | ||
2472 | #endif /* CONFIG_PROC_FS */ | |
2473 | ||
339bf98f TG |
2474 | static inline size_t neigh_nlmsg_size(void) |
2475 | { | |
2476 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2477 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2478 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2479 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2480 | + nla_total_size(4); /* NDA_PROBES */ | |
2481 | } | |
2482 | ||
b8673311 | 2483 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2484 | { |
426b5303 | 2485 | struct net *net = n->dev->nd_net; |
8b8aec50 | 2486 | struct sk_buff *skb; |
b8673311 | 2487 | int err = -ENOBUFS; |
1da177e4 | 2488 | |
339bf98f | 2489 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2490 | if (skb == NULL) |
b8673311 | 2491 | goto errout; |
1da177e4 | 2492 | |
b8673311 | 2493 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2494 | if (err < 0) { |
2495 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2496 | WARN_ON(err == -EMSGSIZE); | |
2497 | kfree_skb(skb); | |
2498 | goto errout; | |
2499 | } | |
426b5303 | 2500 | err = rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
b8673311 TG |
2501 | errout: |
2502 | if (err < 0) | |
426b5303 | 2503 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2504 | } |
2505 | ||
d961db35 | 2506 | #ifdef CONFIG_ARPD |
b8673311 | 2507 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2508 | { |
b8673311 TG |
2509 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2510 | } | |
1da177e4 LT |
2511 | #endif /* CONFIG_ARPD */ |
2512 | ||
2513 | #ifdef CONFIG_SYSCTL | |
2514 | ||
2515 | static struct neigh_sysctl_table { | |
2516 | struct ctl_table_header *sysctl_header; | |
c3bac5a7 PE |
2517 | struct ctl_table neigh_vars[__NET_NEIGH_MAX]; |
2518 | char *dev_name; | |
ab32ea5d | 2519 | } neigh_sysctl_template __read_mostly = { |
1da177e4 LT |
2520 | .neigh_vars = { |
2521 | { | |
2522 | .ctl_name = NET_NEIGH_MCAST_SOLICIT, | |
2523 | .procname = "mcast_solicit", | |
2524 | .maxlen = sizeof(int), | |
2525 | .mode = 0644, | |
2526 | .proc_handler = &proc_dointvec, | |
2527 | }, | |
2528 | { | |
2529 | .ctl_name = NET_NEIGH_UCAST_SOLICIT, | |
2530 | .procname = "ucast_solicit", | |
2531 | .maxlen = sizeof(int), | |
2532 | .mode = 0644, | |
2533 | .proc_handler = &proc_dointvec, | |
2534 | }, | |
2535 | { | |
2536 | .ctl_name = NET_NEIGH_APP_SOLICIT, | |
2537 | .procname = "app_solicit", | |
2538 | .maxlen = sizeof(int), | |
2539 | .mode = 0644, | |
2540 | .proc_handler = &proc_dointvec, | |
2541 | }, | |
2542 | { | |
1da177e4 LT |
2543 | .procname = "retrans_time", |
2544 | .maxlen = sizeof(int), | |
2545 | .mode = 0644, | |
2546 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2547 | }, | |
2548 | { | |
2549 | .ctl_name = NET_NEIGH_REACHABLE_TIME, | |
2550 | .procname = "base_reachable_time", | |
2551 | .maxlen = sizeof(int), | |
2552 | .mode = 0644, | |
2553 | .proc_handler = &proc_dointvec_jiffies, | |
2554 | .strategy = &sysctl_jiffies, | |
2555 | }, | |
2556 | { | |
2557 | .ctl_name = NET_NEIGH_DELAY_PROBE_TIME, | |
2558 | .procname = "delay_first_probe_time", | |
2559 | .maxlen = sizeof(int), | |
2560 | .mode = 0644, | |
2561 | .proc_handler = &proc_dointvec_jiffies, | |
2562 | .strategy = &sysctl_jiffies, | |
2563 | }, | |
2564 | { | |
2565 | .ctl_name = NET_NEIGH_GC_STALE_TIME, | |
2566 | .procname = "gc_stale_time", | |
2567 | .maxlen = sizeof(int), | |
2568 | .mode = 0644, | |
2569 | .proc_handler = &proc_dointvec_jiffies, | |
2570 | .strategy = &sysctl_jiffies, | |
2571 | }, | |
2572 | { | |
2573 | .ctl_name = NET_NEIGH_UNRES_QLEN, | |
2574 | .procname = "unres_qlen", | |
2575 | .maxlen = sizeof(int), | |
2576 | .mode = 0644, | |
2577 | .proc_handler = &proc_dointvec, | |
2578 | }, | |
2579 | { | |
2580 | .ctl_name = NET_NEIGH_PROXY_QLEN, | |
2581 | .procname = "proxy_qlen", | |
2582 | .maxlen = sizeof(int), | |
2583 | .mode = 0644, | |
2584 | .proc_handler = &proc_dointvec, | |
2585 | }, | |
2586 | { | |
1da177e4 LT |
2587 | .procname = "anycast_delay", |
2588 | .maxlen = sizeof(int), | |
2589 | .mode = 0644, | |
2590 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2591 | }, | |
2592 | { | |
1da177e4 LT |
2593 | .procname = "proxy_delay", |
2594 | .maxlen = sizeof(int), | |
2595 | .mode = 0644, | |
2596 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2597 | }, | |
2598 | { | |
1da177e4 LT |
2599 | .procname = "locktime", |
2600 | .maxlen = sizeof(int), | |
2601 | .mode = 0644, | |
2602 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2603 | }, | |
d12af679 EB |
2604 | { |
2605 | .ctl_name = NET_NEIGH_RETRANS_TIME_MS, | |
2606 | .procname = "retrans_time_ms", | |
2607 | .maxlen = sizeof(int), | |
2608 | .mode = 0644, | |
2609 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2610 | .strategy = &sysctl_ms_jiffies, | |
2611 | }, | |
2612 | { | |
2613 | .ctl_name = NET_NEIGH_REACHABLE_TIME_MS, | |
2614 | .procname = "base_reachable_time_ms", | |
2615 | .maxlen = sizeof(int), | |
2616 | .mode = 0644, | |
2617 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2618 | .strategy = &sysctl_ms_jiffies, | |
2619 | }, | |
1da177e4 LT |
2620 | { |
2621 | .ctl_name = NET_NEIGH_GC_INTERVAL, | |
2622 | .procname = "gc_interval", | |
2623 | .maxlen = sizeof(int), | |
2624 | .mode = 0644, | |
2625 | .proc_handler = &proc_dointvec_jiffies, | |
2626 | .strategy = &sysctl_jiffies, | |
2627 | }, | |
2628 | { | |
2629 | .ctl_name = NET_NEIGH_GC_THRESH1, | |
2630 | .procname = "gc_thresh1", | |
2631 | .maxlen = sizeof(int), | |
2632 | .mode = 0644, | |
2633 | .proc_handler = &proc_dointvec, | |
2634 | }, | |
2635 | { | |
2636 | .ctl_name = NET_NEIGH_GC_THRESH2, | |
2637 | .procname = "gc_thresh2", | |
2638 | .maxlen = sizeof(int), | |
2639 | .mode = 0644, | |
2640 | .proc_handler = &proc_dointvec, | |
2641 | }, | |
2642 | { | |
2643 | .ctl_name = NET_NEIGH_GC_THRESH3, | |
2644 | .procname = "gc_thresh3", | |
2645 | .maxlen = sizeof(int), | |
2646 | .mode = 0644, | |
2647 | .proc_handler = &proc_dointvec, | |
2648 | }, | |
c3bac5a7 | 2649 | {}, |
1da177e4 LT |
2650 | }, |
2651 | }; | |
2652 | ||
2653 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
4ec93edb | 2654 | int p_id, int pdev_id, char *p_name, |
1da177e4 LT |
2655 | proc_handler *handler, ctl_handler *strategy) |
2656 | { | |
3c607bbb | 2657 | struct neigh_sysctl_table *t; |
1da177e4 | 2658 | const char *dev_name_source = NULL; |
c3bac5a7 PE |
2659 | |
2660 | #define NEIGH_CTL_PATH_ROOT 0 | |
2661 | #define NEIGH_CTL_PATH_PROTO 1 | |
2662 | #define NEIGH_CTL_PATH_NEIGH 2 | |
2663 | #define NEIGH_CTL_PATH_DEV 3 | |
2664 | ||
2665 | struct ctl_path neigh_path[] = { | |
2666 | { .procname = "net", .ctl_name = CTL_NET, }, | |
2667 | { .procname = "proto", .ctl_name = 0, }, | |
2668 | { .procname = "neigh", .ctl_name = 0, }, | |
2669 | { .procname = "default", .ctl_name = NET_PROTO_CONF_DEFAULT, }, | |
2670 | { }, | |
2671 | }; | |
1da177e4 | 2672 | |
3c607bbb | 2673 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2674 | if (!t) |
3c607bbb PE |
2675 | goto err; |
2676 | ||
1da177e4 LT |
2677 | t->neigh_vars[0].data = &p->mcast_probes; |
2678 | t->neigh_vars[1].data = &p->ucast_probes; | |
2679 | t->neigh_vars[2].data = &p->app_probes; | |
2680 | t->neigh_vars[3].data = &p->retrans_time; | |
2681 | t->neigh_vars[4].data = &p->base_reachable_time; | |
2682 | t->neigh_vars[5].data = &p->delay_probe_time; | |
2683 | t->neigh_vars[6].data = &p->gc_staletime; | |
2684 | t->neigh_vars[7].data = &p->queue_len; | |
2685 | t->neigh_vars[8].data = &p->proxy_qlen; | |
2686 | t->neigh_vars[9].data = &p->anycast_delay; | |
2687 | t->neigh_vars[10].data = &p->proxy_delay; | |
2688 | t->neigh_vars[11].data = &p->locktime; | |
d12af679 EB |
2689 | t->neigh_vars[12].data = &p->retrans_time; |
2690 | t->neigh_vars[13].data = &p->base_reachable_time; | |
1da177e4 LT |
2691 | |
2692 | if (dev) { | |
2693 | dev_name_source = dev->name; | |
c3bac5a7 | 2694 | neigh_path[NEIGH_CTL_PATH_DEV].ctl_name = dev->ifindex; |
d12af679 EB |
2695 | /* Terminate the table early */ |
2696 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); | |
1da177e4 | 2697 | } else { |
c3bac5a7 | 2698 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
d12af679 EB |
2699 | t->neigh_vars[14].data = (int *)(p + 1); |
2700 | t->neigh_vars[15].data = (int *)(p + 1) + 1; | |
2701 | t->neigh_vars[16].data = (int *)(p + 1) + 2; | |
2702 | t->neigh_vars[17].data = (int *)(p + 1) + 3; | |
1da177e4 LT |
2703 | } |
2704 | ||
1da177e4 LT |
2705 | |
2706 | if (handler || strategy) { | |
2707 | /* RetransTime */ | |
2708 | t->neigh_vars[3].proc_handler = handler; | |
2709 | t->neigh_vars[3].strategy = strategy; | |
2710 | t->neigh_vars[3].extra1 = dev; | |
d12af679 EB |
2711 | if (!strategy) |
2712 | t->neigh_vars[3].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2713 | /* ReachableTime */ |
2714 | t->neigh_vars[4].proc_handler = handler; | |
2715 | t->neigh_vars[4].strategy = strategy; | |
2716 | t->neigh_vars[4].extra1 = dev; | |
d12af679 EB |
2717 | if (!strategy) |
2718 | t->neigh_vars[4].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2719 | /* RetransTime (in milliseconds)*/ |
d12af679 EB |
2720 | t->neigh_vars[12].proc_handler = handler; |
2721 | t->neigh_vars[12].strategy = strategy; | |
2722 | t->neigh_vars[12].extra1 = dev; | |
2723 | if (!strategy) | |
2724 | t->neigh_vars[12].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2725 | /* ReachableTime (in milliseconds) */ |
d12af679 EB |
2726 | t->neigh_vars[13].proc_handler = handler; |
2727 | t->neigh_vars[13].strategy = strategy; | |
2728 | t->neigh_vars[13].extra1 = dev; | |
2729 | if (!strategy) | |
2730 | t->neigh_vars[13].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2731 | } |
2732 | ||
c3bac5a7 PE |
2733 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
2734 | if (!t->dev_name) | |
1da177e4 | 2735 | goto free; |
1da177e4 | 2736 | |
c3bac5a7 PE |
2737 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
2738 | neigh_path[NEIGH_CTL_PATH_NEIGH].ctl_name = pdev_id; | |
2739 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; | |
2740 | neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id; | |
1da177e4 | 2741 | |
c3bac5a7 | 2742 | t->sysctl_header = register_sysctl_paths(neigh_path, t->neigh_vars); |
3c607bbb | 2743 | if (!t->sysctl_header) |
1da177e4 | 2744 | goto free_procname; |
3c607bbb | 2745 | |
1da177e4 LT |
2746 | p->sysctl_table = t; |
2747 | return 0; | |
2748 | ||
3c607bbb | 2749 | free_procname: |
c3bac5a7 | 2750 | kfree(t->dev_name); |
3c607bbb | 2751 | free: |
1da177e4 | 2752 | kfree(t); |
3c607bbb PE |
2753 | err: |
2754 | return -ENOBUFS; | |
1da177e4 LT |
2755 | } |
2756 | ||
2757 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
2758 | { | |
2759 | if (p->sysctl_table) { | |
2760 | struct neigh_sysctl_table *t = p->sysctl_table; | |
2761 | p->sysctl_table = NULL; | |
2762 | unregister_sysctl_table(t->sysctl_header); | |
c3bac5a7 | 2763 | kfree(t->dev_name); |
1da177e4 LT |
2764 | kfree(t); |
2765 | } | |
2766 | } | |
2767 | ||
2768 | #endif /* CONFIG_SYSCTL */ | |
2769 | ||
c8822a4e TG |
2770 | static int __init neigh_init(void) |
2771 | { | |
2772 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL); | |
2773 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL); | |
2774 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info); | |
2775 | ||
2776 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info); | |
2777 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL); | |
2778 | ||
2779 | return 0; | |
2780 | } | |
2781 | ||
2782 | subsys_initcall(neigh_init); | |
2783 | ||
1da177e4 | 2784 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 LT |
2785 | EXPORT_SYMBOL(neigh_changeaddr); |
2786 | EXPORT_SYMBOL(neigh_compat_output); | |
2787 | EXPORT_SYMBOL(neigh_connected_output); | |
2788 | EXPORT_SYMBOL(neigh_create); | |
1da177e4 | 2789 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
2790 | EXPORT_SYMBOL(neigh_event_ns); |
2791 | EXPORT_SYMBOL(neigh_ifdown); | |
2792 | EXPORT_SYMBOL(neigh_lookup); | |
2793 | EXPORT_SYMBOL(neigh_lookup_nodev); | |
2794 | EXPORT_SYMBOL(neigh_parms_alloc); | |
2795 | EXPORT_SYMBOL(neigh_parms_release); | |
2796 | EXPORT_SYMBOL(neigh_rand_reach_time); | |
2797 | EXPORT_SYMBOL(neigh_resolve_output); | |
2798 | EXPORT_SYMBOL(neigh_table_clear); | |
2799 | EXPORT_SYMBOL(neigh_table_init); | |
bd89efc5 | 2800 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
1da177e4 | 2801 | EXPORT_SYMBOL(neigh_update); |
1da177e4 LT |
2802 | EXPORT_SYMBOL(pneigh_enqueue); |
2803 | EXPORT_SYMBOL(pneigh_lookup); | |
2804 | ||
2805 | #ifdef CONFIG_ARPD | |
2806 | EXPORT_SYMBOL(neigh_app_ns); | |
2807 | #endif | |
2808 | #ifdef CONFIG_SYSCTL | |
2809 | EXPORT_SYMBOL(neigh_sysctl_register); | |
2810 | EXPORT_SYMBOL(neigh_sysctl_unregister); | |
2811 | #endif |