Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Generic address resolution entity | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Fixes: | |
14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
15 | * Harald Welte Add neighbour cache statistics like rtstat | |
16 | */ | |
17 | ||
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); | |
510 | kfree(n); | |
511 | n = NULL; | |
512 | goto out; | |
513 | } | |
514 | ||
515 | write_lock_bh(&tbl->lock); | |
516 | n->next = tbl->phash_buckets[hash_val]; | |
517 | tbl->phash_buckets[hash_val] = n; | |
518 | write_unlock_bh(&tbl->lock); | |
519 | out: | |
520 | return n; | |
521 | } | |
522 | ||
523 | ||
426b5303 | 524 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
525 | struct net_device *dev) |
526 | { | |
527 | struct pneigh_entry *n, **np; | |
528 | int key_len = tbl->key_len; | |
529 | u32 hash_val = *(u32 *)(pkey + key_len - 4); | |
530 | ||
531 | hash_val ^= (hash_val >> 16); | |
532 | hash_val ^= hash_val >> 8; | |
533 | hash_val ^= hash_val >> 4; | |
534 | hash_val &= PNEIGH_HASHMASK; | |
535 | ||
536 | write_lock_bh(&tbl->lock); | |
537 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
538 | np = &n->next) { | |
426b5303 EB |
539 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
540 | (n->net == net)) { | |
1da177e4 LT |
541 | *np = n->next; |
542 | write_unlock_bh(&tbl->lock); | |
543 | if (tbl->pdestructor) | |
544 | tbl->pdestructor(n); | |
545 | if (n->dev) | |
546 | dev_put(n->dev); | |
426b5303 | 547 | release_net(n->net); |
1da177e4 LT |
548 | kfree(n); |
549 | return 0; | |
550 | } | |
551 | } | |
552 | write_unlock_bh(&tbl->lock); | |
553 | return -ENOENT; | |
554 | } | |
555 | ||
556 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
557 | { | |
558 | struct pneigh_entry *n, **np; | |
559 | u32 h; | |
560 | ||
561 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
562 | np = &tbl->phash_buckets[h]; | |
563 | while ((n = *np) != NULL) { | |
564 | if (!dev || n->dev == dev) { | |
565 | *np = n->next; | |
566 | if (tbl->pdestructor) | |
567 | tbl->pdestructor(n); | |
568 | if (n->dev) | |
569 | dev_put(n->dev); | |
426b5303 | 570 | release_net(n->net); |
1da177e4 LT |
571 | kfree(n); |
572 | continue; | |
573 | } | |
574 | np = &n->next; | |
575 | } | |
576 | } | |
577 | return -ENOENT; | |
578 | } | |
579 | ||
06f0511d DL |
580 | static void neigh_parms_destroy(struct neigh_parms *parms); |
581 | ||
582 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
583 | { | |
584 | if (atomic_dec_and_test(&parms->refcnt)) | |
585 | neigh_parms_destroy(parms); | |
586 | } | |
1da177e4 LT |
587 | |
588 | /* | |
589 | * neighbour must already be out of the table; | |
590 | * | |
591 | */ | |
592 | void neigh_destroy(struct neighbour *neigh) | |
593 | { | |
594 | struct hh_cache *hh; | |
595 | ||
596 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); | |
597 | ||
598 | if (!neigh->dead) { | |
599 | printk(KERN_WARNING | |
600 | "Destroying alive neighbour %p\n", neigh); | |
601 | dump_stack(); | |
602 | return; | |
603 | } | |
604 | ||
605 | if (neigh_del_timer(neigh)) | |
606 | printk(KERN_WARNING "Impossible event.\n"); | |
607 | ||
608 | while ((hh = neigh->hh) != NULL) { | |
609 | neigh->hh = hh->hh_next; | |
610 | hh->hh_next = NULL; | |
3644f0ce SH |
611 | |
612 | write_seqlock_bh(&hh->hh_lock); | |
1da177e4 | 613 | hh->hh_output = neigh_blackhole; |
3644f0ce | 614 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
615 | if (atomic_dec_and_test(&hh->hh_refcnt)) |
616 | kfree(hh); | |
617 | } | |
618 | ||
1da177e4 LT |
619 | skb_queue_purge(&neigh->arp_queue); |
620 | ||
621 | dev_put(neigh->dev); | |
622 | neigh_parms_put(neigh->parms); | |
623 | ||
624 | NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh); | |
625 | ||
626 | atomic_dec(&neigh->tbl->entries); | |
627 | kmem_cache_free(neigh->tbl->kmem_cachep, neigh); | |
628 | } | |
629 | ||
630 | /* Neighbour state is suspicious; | |
631 | disable fast path. | |
632 | ||
633 | Called with write_locked neigh. | |
634 | */ | |
635 | static void neigh_suspect(struct neighbour *neigh) | |
636 | { | |
637 | struct hh_cache *hh; | |
638 | ||
639 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
640 | ||
641 | neigh->output = neigh->ops->output; | |
642 | ||
643 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
644 | hh->hh_output = neigh->ops->output; | |
645 | } | |
646 | ||
647 | /* Neighbour state is OK; | |
648 | enable fast path. | |
649 | ||
650 | Called with write_locked neigh. | |
651 | */ | |
652 | static void neigh_connect(struct neighbour *neigh) | |
653 | { | |
654 | struct hh_cache *hh; | |
655 | ||
656 | NEIGH_PRINTK2("neigh %p is connected.\n", neigh); | |
657 | ||
658 | neigh->output = neigh->ops->connected_output; | |
659 | ||
660 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
661 | hh->hh_output = neigh->ops->hh_output; | |
662 | } | |
663 | ||
664 | static void neigh_periodic_timer(unsigned long arg) | |
665 | { | |
666 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
667 | struct neighbour *n, **np; | |
668 | unsigned long expire, now = jiffies; | |
669 | ||
670 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
671 | ||
672 | write_lock(&tbl->lock); | |
673 | ||
674 | /* | |
675 | * periodically recompute ReachableTime from random function | |
676 | */ | |
677 | ||
678 | if (time_after(now, tbl->last_rand + 300 * HZ)) { | |
679 | struct neigh_parms *p; | |
680 | tbl->last_rand = now; | |
681 | for (p = &tbl->parms; p; p = p->next) | |
682 | p->reachable_time = | |
683 | neigh_rand_reach_time(p->base_reachable_time); | |
684 | } | |
685 | ||
686 | np = &tbl->hash_buckets[tbl->hash_chain_gc]; | |
687 | tbl->hash_chain_gc = ((tbl->hash_chain_gc + 1) & tbl->hash_mask); | |
688 | ||
689 | while ((n = *np) != NULL) { | |
690 | unsigned int state; | |
691 | ||
692 | write_lock(&n->lock); | |
693 | ||
694 | state = n->nud_state; | |
695 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
696 | write_unlock(&n->lock); | |
697 | goto next_elt; | |
698 | } | |
699 | ||
700 | if (time_before(n->used, n->confirmed)) | |
701 | n->used = n->confirmed; | |
702 | ||
703 | if (atomic_read(&n->refcnt) == 1 && | |
704 | (state == NUD_FAILED || | |
705 | time_after(now, n->used + n->parms->gc_staletime))) { | |
706 | *np = n->next; | |
707 | n->dead = 1; | |
708 | write_unlock(&n->lock); | |
4f494554 | 709 | neigh_cleanup_and_release(n); |
1da177e4 LT |
710 | continue; |
711 | } | |
712 | write_unlock(&n->lock); | |
713 | ||
714 | next_elt: | |
715 | np = &n->next; | |
716 | } | |
717 | ||
4ec93edb YH |
718 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
719 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 | |
720 | * base_reachable_time. | |
1da177e4 LT |
721 | */ |
722 | expire = tbl->parms.base_reachable_time >> 1; | |
723 | expire /= (tbl->hash_mask + 1); | |
724 | if (!expire) | |
725 | expire = 1; | |
726 | ||
f5a6e01c AV |
727 | if (expire>HZ) |
728 | mod_timer(&tbl->gc_timer, round_jiffies(now + expire)); | |
729 | else | |
730 | mod_timer(&tbl->gc_timer, now + expire); | |
1da177e4 LT |
731 | |
732 | write_unlock(&tbl->lock); | |
733 | } | |
734 | ||
735 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
736 | { | |
737 | struct neigh_parms *p = n->parms; | |
738 | return (n->nud_state & NUD_PROBE ? | |
739 | p->ucast_probes : | |
740 | p->ucast_probes + p->app_probes + p->mcast_probes); | |
741 | } | |
742 | ||
1da177e4 LT |
743 | /* Called when a timer expires for a neighbour entry. */ |
744 | ||
745 | static void neigh_timer_handler(unsigned long arg) | |
746 | { | |
747 | unsigned long now, next; | |
748 | struct neighbour *neigh = (struct neighbour *)arg; | |
749 | unsigned state; | |
750 | int notify = 0; | |
751 | ||
752 | write_lock(&neigh->lock); | |
753 | ||
754 | state = neigh->nud_state; | |
755 | now = jiffies; | |
756 | next = now + HZ; | |
757 | ||
758 | if (!(state & NUD_IN_TIMER)) { | |
759 | #ifndef CONFIG_SMP | |
760 | printk(KERN_WARNING "neigh: timer & !nud_in_timer\n"); | |
761 | #endif | |
762 | goto out; | |
763 | } | |
764 | ||
765 | if (state & NUD_REACHABLE) { | |
4ec93edb | 766 | if (time_before_eq(now, |
1da177e4 LT |
767 | neigh->confirmed + neigh->parms->reachable_time)) { |
768 | NEIGH_PRINTK2("neigh %p is still alive.\n", neigh); | |
769 | next = neigh->confirmed + neigh->parms->reachable_time; | |
770 | } else if (time_before_eq(now, | |
771 | neigh->used + neigh->parms->delay_probe_time)) { | |
772 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
773 | neigh->nud_state = NUD_DELAY; | |
955aaa2f | 774 | neigh->updated = jiffies; |
1da177e4 LT |
775 | neigh_suspect(neigh); |
776 | next = now + neigh->parms->delay_probe_time; | |
777 | } else { | |
778 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
779 | neigh->nud_state = NUD_STALE; | |
955aaa2f | 780 | neigh->updated = jiffies; |
1da177e4 | 781 | neigh_suspect(neigh); |
8d71740c | 782 | notify = 1; |
1da177e4 LT |
783 | } |
784 | } else if (state & NUD_DELAY) { | |
4ec93edb | 785 | if (time_before_eq(now, |
1da177e4 LT |
786 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
787 | NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh); | |
788 | neigh->nud_state = NUD_REACHABLE; | |
955aaa2f | 789 | neigh->updated = jiffies; |
1da177e4 | 790 | neigh_connect(neigh); |
8d71740c | 791 | notify = 1; |
1da177e4 LT |
792 | next = neigh->confirmed + neigh->parms->reachable_time; |
793 | } else { | |
794 | NEIGH_PRINTK2("neigh %p is probed.\n", neigh); | |
795 | neigh->nud_state = NUD_PROBE; | |
955aaa2f | 796 | neigh->updated = jiffies; |
1da177e4 LT |
797 | atomic_set(&neigh->probes, 0); |
798 | next = now + neigh->parms->retrans_time; | |
799 | } | |
800 | } else { | |
801 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
802 | next = now + neigh->parms->retrans_time; | |
803 | } | |
804 | ||
805 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
806 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
807 | struct sk_buff *skb; | |
808 | ||
809 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 810 | neigh->updated = jiffies; |
1da177e4 LT |
811 | notify = 1; |
812 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
813 | NEIGH_PRINTK2("neigh %p is failed.\n", neigh); | |
814 | ||
815 | /* It is very thin place. report_unreachable is very complicated | |
816 | routine. Particularly, it can hit the same neighbour entry! | |
817 | ||
818 | So that, we try to be accurate and avoid dead loop. --ANK | |
819 | */ | |
820 | while (neigh->nud_state == NUD_FAILED && | |
821 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
822 | write_unlock(&neigh->lock); | |
823 | neigh->ops->error_report(neigh, skb); | |
824 | write_lock(&neigh->lock); | |
825 | } | |
826 | skb_queue_purge(&neigh->arp_queue); | |
827 | } | |
828 | ||
829 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
830 | if (time_before(next, jiffies + HZ/2)) |
831 | next = jiffies + HZ/2; | |
6fb9974f HX |
832 | if (!mod_timer(&neigh->timer, next)) |
833 | neigh_hold(neigh); | |
1da177e4 LT |
834 | } |
835 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
836 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); | |
69cc64d8 | 837 | |
1da177e4 LT |
838 | neigh->ops->solicit(neigh, skb); |
839 | atomic_inc(&neigh->probes); | |
1da177e4 | 840 | } |
69cc64d8 DM |
841 | out: |
842 | write_unlock(&neigh->lock); | |
d961db35 | 843 | |
8d71740c | 844 | if (notify) |
d961db35 | 845 | neigh_update_notify(neigh); |
1da177e4 | 846 | |
1da177e4 LT |
847 | neigh_release(neigh); |
848 | } | |
849 | ||
850 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
851 | { | |
852 | int rc; | |
853 | unsigned long now; | |
854 | ||
855 | write_lock_bh(&neigh->lock); | |
856 | ||
857 | rc = 0; | |
858 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
859 | goto out_unlock_bh; | |
860 | ||
861 | now = jiffies; | |
4ec93edb | 862 | |
1da177e4 LT |
863 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
864 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { | |
865 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); | |
866 | neigh->nud_state = NUD_INCOMPLETE; | |
955aaa2f | 867 | neigh->updated = jiffies; |
667347f1 | 868 | neigh_add_timer(neigh, now + 1); |
1da177e4 LT |
869 | } else { |
870 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 871 | neigh->updated = jiffies; |
1da177e4 LT |
872 | write_unlock_bh(&neigh->lock); |
873 | ||
874 | if (skb) | |
875 | kfree_skb(skb); | |
876 | return 1; | |
877 | } | |
878 | } else if (neigh->nud_state & NUD_STALE) { | |
879 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
1da177e4 | 880 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 881 | neigh->updated = jiffies; |
667347f1 DM |
882 | neigh_add_timer(neigh, |
883 | jiffies + neigh->parms->delay_probe_time); | |
1da177e4 LT |
884 | } |
885 | ||
886 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
887 | if (skb) { | |
888 | if (skb_queue_len(&neigh->arp_queue) >= | |
889 | neigh->parms->queue_len) { | |
890 | struct sk_buff *buff; | |
891 | buff = neigh->arp_queue.next; | |
892 | __skb_unlink(buff, &neigh->arp_queue); | |
893 | kfree_skb(buff); | |
894 | } | |
895 | __skb_queue_tail(&neigh->arp_queue, skb); | |
896 | } | |
897 | rc = 1; | |
898 | } | |
899 | out_unlock_bh: | |
900 | write_unlock_bh(&neigh->lock); | |
901 | return rc; | |
902 | } | |
903 | ||
e92b43a3 | 904 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
905 | { |
906 | struct hh_cache *hh; | |
3b04ddde SH |
907 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
908 | = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
909 | |
910 | if (update) { | |
911 | for (hh = neigh->hh; hh; hh = hh->hh_next) { | |
3644f0ce | 912 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 913 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 914 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
915 | } |
916 | } | |
917 | } | |
918 | ||
919 | ||
920 | ||
921 | /* Generic update routine. | |
922 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
923 | -- new is new state. | |
924 | -- flags | |
925 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
926 | if it is different. | |
927 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 928 | lladdr instead of overriding it |
1da177e4 LT |
929 | if it is different. |
930 | It also allows to retain current state | |
931 | if lladdr is unchanged. | |
932 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
933 | ||
4ec93edb | 934 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
935 | NTF_ROUTER flag. |
936 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
937 | a router. | |
938 | ||
939 | Caller MUST hold reference count on the entry. | |
940 | */ | |
941 | ||
942 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
943 | u32 flags) | |
944 | { | |
945 | u8 old; | |
946 | int err; | |
1da177e4 | 947 | int notify = 0; |
1da177e4 LT |
948 | struct net_device *dev; |
949 | int update_isrouter = 0; | |
950 | ||
951 | write_lock_bh(&neigh->lock); | |
952 | ||
953 | dev = neigh->dev; | |
954 | old = neigh->nud_state; | |
955 | err = -EPERM; | |
956 | ||
4ec93edb | 957 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
958 | (old & (NUD_NOARP | NUD_PERMANENT))) |
959 | goto out; | |
960 | ||
961 | if (!(new & NUD_VALID)) { | |
962 | neigh_del_timer(neigh); | |
963 | if (old & NUD_CONNECTED) | |
964 | neigh_suspect(neigh); | |
965 | neigh->nud_state = new; | |
966 | err = 0; | |
1da177e4 | 967 | notify = old & NUD_VALID; |
1da177e4 LT |
968 | goto out; |
969 | } | |
970 | ||
971 | /* Compare new lladdr with cached one */ | |
972 | if (!dev->addr_len) { | |
973 | /* First case: device needs no address. */ | |
974 | lladdr = neigh->ha; | |
975 | } else if (lladdr) { | |
976 | /* The second case: if something is already cached | |
977 | and a new address is proposed: | |
978 | - compare new & old | |
979 | - if they are different, check override flag | |
980 | */ | |
4ec93edb | 981 | if ((old & NUD_VALID) && |
1da177e4 LT |
982 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
983 | lladdr = neigh->ha; | |
984 | } else { | |
985 | /* No address is supplied; if we know something, | |
986 | use it, otherwise discard the request. | |
987 | */ | |
988 | err = -EINVAL; | |
989 | if (!(old & NUD_VALID)) | |
990 | goto out; | |
991 | lladdr = neigh->ha; | |
992 | } | |
993 | ||
994 | if (new & NUD_CONNECTED) | |
995 | neigh->confirmed = jiffies; | |
996 | neigh->updated = jiffies; | |
997 | ||
998 | /* If entry was valid and address is not changed, | |
999 | do not change entry state, if new one is STALE. | |
1000 | */ | |
1001 | err = 0; | |
1002 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1003 | if (old & NUD_VALID) { | |
1004 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1005 | update_isrouter = 0; | |
1006 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1007 | (old & NUD_CONNECTED)) { | |
1008 | lladdr = neigh->ha; | |
1009 | new = NUD_STALE; | |
1010 | } else | |
1011 | goto out; | |
1012 | } else { | |
1013 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1014 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1015 | (old & NUD_CONNECTED)) | |
1016 | ) | |
1017 | new = old; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | if (new != old) { | |
1022 | neigh_del_timer(neigh); | |
a43d8994 | 1023 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1024 | neigh_add_timer(neigh, (jiffies + |
1025 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1026 | neigh->parms->reachable_time : |
1027 | 0))); | |
1da177e4 LT |
1028 | neigh->nud_state = new; |
1029 | } | |
1030 | ||
1031 | if (lladdr != neigh->ha) { | |
1032 | memcpy(&neigh->ha, lladdr, dev->addr_len); | |
1033 | neigh_update_hhs(neigh); | |
1034 | if (!(new & NUD_CONNECTED)) | |
1035 | neigh->confirmed = jiffies - | |
1036 | (neigh->parms->base_reachable_time << 1); | |
1da177e4 | 1037 | notify = 1; |
1da177e4 LT |
1038 | } |
1039 | if (new == old) | |
1040 | goto out; | |
1041 | if (new & NUD_CONNECTED) | |
1042 | neigh_connect(neigh); | |
1043 | else | |
1044 | neigh_suspect(neigh); | |
1045 | if (!(old & NUD_VALID)) { | |
1046 | struct sk_buff *skb; | |
1047 | ||
1048 | /* Again: avoid dead loop if something went wrong */ | |
1049 | ||
1050 | while (neigh->nud_state & NUD_VALID && | |
1051 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
1052 | struct neighbour *n1 = neigh; | |
1053 | write_unlock_bh(&neigh->lock); | |
1054 | /* On shaper/eql skb->dst->neighbour != neigh :( */ | |
1055 | if (skb->dst && skb->dst->neighbour) | |
1056 | n1 = skb->dst->neighbour; | |
1057 | n1->output(skb); | |
1058 | write_lock_bh(&neigh->lock); | |
1059 | } | |
1060 | skb_queue_purge(&neigh->arp_queue); | |
1061 | } | |
1062 | out: | |
1063 | if (update_isrouter) { | |
1064 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1065 | (neigh->flags | NTF_ROUTER) : | |
1066 | (neigh->flags & ~NTF_ROUTER); | |
1067 | } | |
1068 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1069 | |
1070 | if (notify) | |
d961db35 TG |
1071 | neigh_update_notify(neigh); |
1072 | ||
1da177e4 LT |
1073 | return err; |
1074 | } | |
1075 | ||
1076 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1077 | u8 *lladdr, void *saddr, | |
1078 | struct net_device *dev) | |
1079 | { | |
1080 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1081 | lladdr || !dev->addr_len); | |
1082 | if (neigh) | |
4ec93edb | 1083 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1084 | NEIGH_UPDATE_F_OVERRIDE); |
1085 | return neigh; | |
1086 | } | |
1087 | ||
1088 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst, | |
d77072ec | 1089 | __be16 protocol) |
1da177e4 LT |
1090 | { |
1091 | struct hh_cache *hh; | |
1092 | struct net_device *dev = dst->dev; | |
1093 | ||
1094 | for (hh = n->hh; hh; hh = hh->hh_next) | |
1095 | if (hh->hh_type == protocol) | |
1096 | break; | |
1097 | ||
77d04bd9 | 1098 | if (!hh && (hh = kzalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) { |
3644f0ce | 1099 | seqlock_init(&hh->hh_lock); |
1da177e4 LT |
1100 | hh->hh_type = protocol; |
1101 | atomic_set(&hh->hh_refcnt, 0); | |
1102 | hh->hh_next = NULL; | |
3b04ddde SH |
1103 | |
1104 | if (dev->header_ops->cache(n, hh)) { | |
1da177e4 LT |
1105 | kfree(hh); |
1106 | hh = NULL; | |
1107 | } else { | |
1108 | atomic_inc(&hh->hh_refcnt); | |
1109 | hh->hh_next = n->hh; | |
1110 | n->hh = hh; | |
1111 | if (n->nud_state & NUD_CONNECTED) | |
1112 | hh->hh_output = n->ops->hh_output; | |
1113 | else | |
1114 | hh->hh_output = n->ops->output; | |
1115 | } | |
1116 | } | |
1117 | if (hh) { | |
1118 | atomic_inc(&hh->hh_refcnt); | |
1119 | dst->hh = hh; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | /* This function can be used in contexts, where only old dev_queue_xmit | |
1124 | worked, f.e. if you want to override normal output path (eql, shaper), | |
1125 | but resolution is not made yet. | |
1126 | */ | |
1127 | ||
1128 | int neigh_compat_output(struct sk_buff *skb) | |
1129 | { | |
1130 | struct net_device *dev = skb->dev; | |
1131 | ||
bbe735e4 | 1132 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1133 | |
0c4e8581 SH |
1134 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
1135 | skb->len) < 0 && | |
3b04ddde | 1136 | dev->header_ops->rebuild(skb)) |
1da177e4 LT |
1137 | return 0; |
1138 | ||
1139 | return dev_queue_xmit(skb); | |
1140 | } | |
1141 | ||
1142 | /* Slow and careful. */ | |
1143 | ||
1144 | int neigh_resolve_output(struct sk_buff *skb) | |
1145 | { | |
1146 | struct dst_entry *dst = skb->dst; | |
1147 | struct neighbour *neigh; | |
1148 | int rc = 0; | |
1149 | ||
1150 | if (!dst || !(neigh = dst->neighbour)) | |
1151 | goto discard; | |
1152 | ||
bbe735e4 | 1153 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1154 | |
1155 | if (!neigh_event_send(neigh, skb)) { | |
1156 | int err; | |
1157 | struct net_device *dev = neigh->dev; | |
3b04ddde | 1158 | if (dev->header_ops->cache && !dst->hh) { |
1da177e4 LT |
1159 | write_lock_bh(&neigh->lock); |
1160 | if (!dst->hh) | |
1161 | neigh_hh_init(neigh, dst, dst->ops->protocol); | |
0c4e8581 SH |
1162 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1163 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1164 | write_unlock_bh(&neigh->lock); |
1165 | } else { | |
1166 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1167 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1168 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1169 | read_unlock_bh(&neigh->lock); |
1170 | } | |
1171 | if (err >= 0) | |
1172 | rc = neigh->ops->queue_xmit(skb); | |
1173 | else | |
1174 | goto out_kfree_skb; | |
1175 | } | |
1176 | out: | |
1177 | return rc; | |
1178 | discard: | |
1179 | NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n", | |
1180 | dst, dst ? dst->neighbour : NULL); | |
1181 | out_kfree_skb: | |
1182 | rc = -EINVAL; | |
1183 | kfree_skb(skb); | |
1184 | goto out; | |
1185 | } | |
1186 | ||
1187 | /* As fast as possible without hh cache */ | |
1188 | ||
1189 | int neigh_connected_output(struct sk_buff *skb) | |
1190 | { | |
1191 | int err; | |
1192 | struct dst_entry *dst = skb->dst; | |
1193 | struct neighbour *neigh = dst->neighbour; | |
1194 | struct net_device *dev = neigh->dev; | |
1195 | ||
bbe735e4 | 1196 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1197 | |
1198 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1199 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1200 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1201 | read_unlock_bh(&neigh->lock); |
1202 | if (err >= 0) | |
1203 | err = neigh->ops->queue_xmit(skb); | |
1204 | else { | |
1205 | err = -EINVAL; | |
1206 | kfree_skb(skb); | |
1207 | } | |
1208 | return err; | |
1209 | } | |
1210 | ||
1211 | static void neigh_proxy_process(unsigned long arg) | |
1212 | { | |
1213 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1214 | long sched_next = 0; | |
1215 | unsigned long now = jiffies; | |
1216 | struct sk_buff *skb; | |
1217 | ||
1218 | spin_lock(&tbl->proxy_queue.lock); | |
1219 | ||
1220 | skb = tbl->proxy_queue.next; | |
1221 | ||
1222 | while (skb != (struct sk_buff *)&tbl->proxy_queue) { | |
1223 | struct sk_buff *back = skb; | |
a61bbcf2 | 1224 | long tdif = NEIGH_CB(back)->sched_next - now; |
1da177e4 LT |
1225 | |
1226 | skb = skb->next; | |
1227 | if (tdif <= 0) { | |
1228 | struct net_device *dev = back->dev; | |
1229 | __skb_unlink(back, &tbl->proxy_queue); | |
1230 | if (tbl->proxy_redo && netif_running(dev)) | |
1231 | tbl->proxy_redo(back); | |
1232 | else | |
1233 | kfree_skb(back); | |
1234 | ||
1235 | dev_put(dev); | |
1236 | } else if (!sched_next || tdif < sched_next) | |
1237 | sched_next = tdif; | |
1238 | } | |
1239 | del_timer(&tbl->proxy_timer); | |
1240 | if (sched_next) | |
1241 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1242 | spin_unlock(&tbl->proxy_queue.lock); | |
1243 | } | |
1244 | ||
1245 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1246 | struct sk_buff *skb) | |
1247 | { | |
1248 | unsigned long now = jiffies; | |
1249 | unsigned long sched_next = now + (net_random() % p->proxy_delay); | |
1250 | ||
1251 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { | |
1252 | kfree_skb(skb); | |
1253 | return; | |
1254 | } | |
a61bbcf2 PM |
1255 | |
1256 | NEIGH_CB(skb)->sched_next = sched_next; | |
1257 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1258 | |
1259 | spin_lock(&tbl->proxy_queue.lock); | |
1260 | if (del_timer(&tbl->proxy_timer)) { | |
1261 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1262 | sched_next = tbl->proxy_timer.expires; | |
1263 | } | |
1264 | dst_release(skb->dst); | |
1265 | skb->dst = NULL; | |
1266 | dev_hold(skb->dev); | |
1267 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1268 | mod_timer(&tbl->proxy_timer, sched_next); | |
1269 | spin_unlock(&tbl->proxy_queue.lock); | |
1270 | } | |
1271 | ||
426b5303 EB |
1272 | static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl, |
1273 | struct net *net, int ifindex) | |
1274 | { | |
1275 | struct neigh_parms *p; | |
1276 | ||
1277 | for (p = &tbl->parms; p; p = p->next) { | |
1278 | if (p->net != net) | |
1279 | continue; | |
1280 | if ((p->dev && p->dev->ifindex == ifindex) || | |
1281 | (!p->dev && !ifindex)) | |
1282 | return p; | |
1283 | } | |
1284 | ||
1285 | return NULL; | |
1286 | } | |
1da177e4 LT |
1287 | |
1288 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1289 | struct neigh_table *tbl) | |
1290 | { | |
426b5303 EB |
1291 | struct neigh_parms *p, *ref; |
1292 | struct net *net; | |
1293 | ||
486b51d3 | 1294 | net = dev->nd_net; |
426b5303 EB |
1295 | ref = lookup_neigh_params(tbl, net, 0); |
1296 | if (!ref) | |
1297 | return NULL; | |
1da177e4 | 1298 | |
426b5303 | 1299 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1300 | if (p) { |
1da177e4 LT |
1301 | p->tbl = tbl; |
1302 | atomic_set(&p->refcnt, 1); | |
1303 | INIT_RCU_HEAD(&p->rcu_head); | |
1304 | p->reachable_time = | |
1305 | neigh_rand_reach_time(p->base_reachable_time); | |
c7fb64db | 1306 | |
486b51d3 DL |
1307 | if (dev->neigh_setup && dev->neigh_setup(dev, p)) { |
1308 | kfree(p); | |
1309 | return NULL; | |
1da177e4 | 1310 | } |
486b51d3 DL |
1311 | |
1312 | dev_hold(dev); | |
1313 | p->dev = dev; | |
426b5303 | 1314 | p->net = hold_net(net); |
1da177e4 LT |
1315 | p->sysctl_table = NULL; |
1316 | write_lock_bh(&tbl->lock); | |
1317 | p->next = tbl->parms.next; | |
1318 | tbl->parms.next = p; | |
1319 | write_unlock_bh(&tbl->lock); | |
1320 | } | |
1321 | return p; | |
1322 | } | |
1323 | ||
1324 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1325 | { | |
1326 | struct neigh_parms *parms = | |
1327 | container_of(head, struct neigh_parms, rcu_head); | |
1328 | ||
1329 | neigh_parms_put(parms); | |
1330 | } | |
1331 | ||
1332 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1333 | { | |
1334 | struct neigh_parms **p; | |
1335 | ||
1336 | if (!parms || parms == &tbl->parms) | |
1337 | return; | |
1338 | write_lock_bh(&tbl->lock); | |
1339 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { | |
1340 | if (*p == parms) { | |
1341 | *p = parms->next; | |
1342 | parms->dead = 1; | |
1343 | write_unlock_bh(&tbl->lock); | |
cecbb639 DM |
1344 | if (parms->dev) |
1345 | dev_put(parms->dev); | |
1da177e4 LT |
1346 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1347 | return; | |
1348 | } | |
1349 | } | |
1350 | write_unlock_bh(&tbl->lock); | |
1351 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); | |
1352 | } | |
1353 | ||
06f0511d | 1354 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1355 | { |
426b5303 | 1356 | release_net(parms->net); |
1da177e4 LT |
1357 | kfree(parms); |
1358 | } | |
1359 | ||
c2ecba71 PE |
1360 | static struct lock_class_key neigh_table_proxy_queue_class; |
1361 | ||
bd89efc5 | 1362 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
1da177e4 LT |
1363 | { |
1364 | unsigned long now = jiffies; | |
1365 | unsigned long phsize; | |
1366 | ||
426b5303 | 1367 | tbl->parms.net = &init_net; |
1da177e4 LT |
1368 | atomic_set(&tbl->parms.refcnt, 1); |
1369 | INIT_RCU_HEAD(&tbl->parms.rcu_head); | |
1370 | tbl->parms.reachable_time = | |
1371 | neigh_rand_reach_time(tbl->parms.base_reachable_time); | |
1372 | ||
1373 | if (!tbl->kmem_cachep) | |
e5d679f3 AD |
1374 | tbl->kmem_cachep = |
1375 | kmem_cache_create(tbl->id, tbl->entry_size, 0, | |
1376 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
20c2df83 | 1377 | NULL); |
1da177e4 LT |
1378 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1379 | if (!tbl->stats) | |
1380 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1381 | |
1da177e4 | 1382 | #ifdef CONFIG_PROC_FS |
457c4cbc | 1383 | tbl->pde = create_proc_entry(tbl->id, 0, init_net.proc_net_stat); |
4ec93edb | 1384 | if (!tbl->pde) |
1da177e4 LT |
1385 | panic("cannot create neighbour proc dir entry"); |
1386 | tbl->pde->proc_fops = &neigh_stat_seq_fops; | |
1387 | tbl->pde->data = tbl; | |
1388 | #endif | |
1389 | ||
1390 | tbl->hash_mask = 1; | |
1391 | tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1); | |
1392 | ||
1393 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1394 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 LT |
1395 | |
1396 | if (!tbl->hash_buckets || !tbl->phash_buckets) | |
1397 | panic("cannot allocate neighbour cache hashes"); | |
1398 | ||
1da177e4 LT |
1399 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
1400 | ||
1401 | rwlock_init(&tbl->lock); | |
b24b8a24 | 1402 | setup_timer(&tbl->gc_timer, neigh_periodic_timer, (unsigned long)tbl); |
1da177e4 LT |
1403 | tbl->gc_timer.expires = now + 1; |
1404 | add_timer(&tbl->gc_timer); | |
1405 | ||
b24b8a24 | 1406 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1407 | skb_queue_head_init_class(&tbl->proxy_queue, |
1408 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1409 | |
1410 | tbl->last_flush = now; | |
1411 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 SK |
1412 | } |
1413 | ||
1414 | void neigh_table_init(struct neigh_table *tbl) | |
1415 | { | |
1416 | struct neigh_table *tmp; | |
1417 | ||
1418 | neigh_table_init_no_netlink(tbl); | |
1da177e4 | 1419 | write_lock(&neigh_tbl_lock); |
bd89efc5 SK |
1420 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
1421 | if (tmp->family == tbl->family) | |
1422 | break; | |
1423 | } | |
1da177e4 LT |
1424 | tbl->next = neigh_tables; |
1425 | neigh_tables = tbl; | |
1426 | write_unlock(&neigh_tbl_lock); | |
bd89efc5 SK |
1427 | |
1428 | if (unlikely(tmp)) { | |
1429 | printk(KERN_ERR "NEIGH: Registering multiple tables for " | |
1430 | "family %d\n", tbl->family); | |
1431 | dump_stack(); | |
1432 | } | |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | int neigh_table_clear(struct neigh_table *tbl) | |
1436 | { | |
1437 | struct neigh_table **tp; | |
1438 | ||
1439 | /* It is not clean... Fix it to unload IPv6 module safely */ | |
1440 | del_timer_sync(&tbl->gc_timer); | |
1441 | del_timer_sync(&tbl->proxy_timer); | |
1442 | pneigh_queue_purge(&tbl->proxy_queue); | |
1443 | neigh_ifdown(tbl, NULL); | |
1444 | if (atomic_read(&tbl->entries)) | |
1445 | printk(KERN_CRIT "neighbour leakage\n"); | |
1446 | write_lock(&neigh_tbl_lock); | |
1447 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { | |
1448 | if (*tp == tbl) { | |
1449 | *tp = tbl->next; | |
1450 | break; | |
1451 | } | |
1452 | } | |
1453 | write_unlock(&neigh_tbl_lock); | |
1454 | ||
1455 | neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1); | |
1456 | tbl->hash_buckets = NULL; | |
1457 | ||
1458 | kfree(tbl->phash_buckets); | |
1459 | tbl->phash_buckets = NULL; | |
1460 | ||
3f192b5c AD |
1461 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1462 | ||
3fcde74b KK |
1463 | free_percpu(tbl->stats); |
1464 | tbl->stats = NULL; | |
1465 | ||
bfb85c9f RD |
1466 | kmem_cache_destroy(tbl->kmem_cachep); |
1467 | tbl->kmem_cachep = NULL; | |
1468 | ||
1da177e4 LT |
1469 | return 0; |
1470 | } | |
1471 | ||
c8822a4e | 1472 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1473 | { |
881d966b | 1474 | struct net *net = skb->sk->sk_net; |
a14a49d2 TG |
1475 | struct ndmsg *ndm; |
1476 | struct nlattr *dst_attr; | |
1da177e4 LT |
1477 | struct neigh_table *tbl; |
1478 | struct net_device *dev = NULL; | |
a14a49d2 | 1479 | int err = -EINVAL; |
1da177e4 | 1480 | |
a14a49d2 | 1481 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1482 | goto out; |
1483 | ||
a14a49d2 TG |
1484 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1485 | if (dst_attr == NULL) | |
1486 | goto out; | |
1487 | ||
1488 | ndm = nlmsg_data(nlh); | |
1489 | if (ndm->ndm_ifindex) { | |
881d966b | 1490 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1491 | if (dev == NULL) { |
1492 | err = -ENODEV; | |
1493 | goto out; | |
1494 | } | |
1495 | } | |
1496 | ||
1da177e4 LT |
1497 | read_lock(&neigh_tbl_lock); |
1498 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
a14a49d2 | 1499 | struct neighbour *neigh; |
1da177e4 LT |
1500 | |
1501 | if (tbl->family != ndm->ndm_family) | |
1502 | continue; | |
1503 | read_unlock(&neigh_tbl_lock); | |
1504 | ||
a14a49d2 | 1505 | if (nla_len(dst_attr) < tbl->key_len) |
1da177e4 LT |
1506 | goto out_dev_put; |
1507 | ||
1508 | if (ndm->ndm_flags & NTF_PROXY) { | |
426b5303 | 1509 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
1da177e4 LT |
1510 | goto out_dev_put; |
1511 | } | |
1512 | ||
a14a49d2 TG |
1513 | if (dev == NULL) |
1514 | goto out_dev_put; | |
1da177e4 | 1515 | |
a14a49d2 TG |
1516 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1517 | if (neigh == NULL) { | |
1518 | err = -ENOENT; | |
1519 | goto out_dev_put; | |
1da177e4 | 1520 | } |
a14a49d2 TG |
1521 | |
1522 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1523 | NEIGH_UPDATE_F_OVERRIDE | | |
1524 | NEIGH_UPDATE_F_ADMIN); | |
1525 | neigh_release(neigh); | |
1da177e4 LT |
1526 | goto out_dev_put; |
1527 | } | |
1528 | read_unlock(&neigh_tbl_lock); | |
a14a49d2 TG |
1529 | err = -EAFNOSUPPORT; |
1530 | ||
1da177e4 LT |
1531 | out_dev_put: |
1532 | if (dev) | |
1533 | dev_put(dev); | |
1534 | out: | |
1535 | return err; | |
1536 | } | |
1537 | ||
c8822a4e | 1538 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1539 | { |
881d966b | 1540 | struct net *net = skb->sk->sk_net; |
5208debd TG |
1541 | struct ndmsg *ndm; |
1542 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1543 | struct neigh_table *tbl; |
1544 | struct net_device *dev = NULL; | |
5208debd | 1545 | int err; |
1da177e4 | 1546 | |
5208debd TG |
1547 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1548 | if (err < 0) | |
1da177e4 LT |
1549 | goto out; |
1550 | ||
5208debd TG |
1551 | err = -EINVAL; |
1552 | if (tb[NDA_DST] == NULL) | |
1553 | goto out; | |
1554 | ||
1555 | ndm = nlmsg_data(nlh); | |
1556 | if (ndm->ndm_ifindex) { | |
881d966b | 1557 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1558 | if (dev == NULL) { |
1559 | err = -ENODEV; | |
1560 | goto out; | |
1561 | } | |
1562 | ||
1563 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
1564 | goto out_dev_put; | |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | read_lock(&neigh_tbl_lock); |
1568 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
5208debd TG |
1569 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
1570 | struct neighbour *neigh; | |
1571 | void *dst, *lladdr; | |
1da177e4 LT |
1572 | |
1573 | if (tbl->family != ndm->ndm_family) | |
1574 | continue; | |
1575 | read_unlock(&neigh_tbl_lock); | |
1576 | ||
5208debd | 1577 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1da177e4 | 1578 | goto out_dev_put; |
5208debd TG |
1579 | dst = nla_data(tb[NDA_DST]); |
1580 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 LT |
1581 | |
1582 | if (ndm->ndm_flags & NTF_PROXY) { | |
62dd9318 VN |
1583 | struct pneigh_entry *pn; |
1584 | ||
1585 | err = -ENOBUFS; | |
426b5303 | 1586 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
62dd9318 VN |
1587 | if (pn) { |
1588 | pn->flags = ndm->ndm_flags; | |
1589 | err = 0; | |
1590 | } | |
1da177e4 LT |
1591 | goto out_dev_put; |
1592 | } | |
1593 | ||
5208debd | 1594 | if (dev == NULL) |
1da177e4 | 1595 | goto out_dev_put; |
5208debd TG |
1596 | |
1597 | neigh = neigh_lookup(tbl, dst, dev); | |
1598 | if (neigh == NULL) { | |
1599 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1600 | err = -ENOENT; | |
1601 | goto out_dev_put; | |
1602 | } | |
4ec93edb | 1603 | |
5208debd TG |
1604 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1605 | if (IS_ERR(neigh)) { | |
1606 | err = PTR_ERR(neigh); | |
1da177e4 LT |
1607 | goto out_dev_put; |
1608 | } | |
1da177e4 | 1609 | } else { |
5208debd TG |
1610 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1611 | err = -EEXIST; | |
1612 | neigh_release(neigh); | |
1da177e4 LT |
1613 | goto out_dev_put; |
1614 | } | |
1da177e4 | 1615 | |
5208debd TG |
1616 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1617 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1618 | } | |
1da177e4 | 1619 | |
5208debd TG |
1620 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); |
1621 | neigh_release(neigh); | |
1da177e4 LT |
1622 | goto out_dev_put; |
1623 | } | |
1624 | ||
1625 | read_unlock(&neigh_tbl_lock); | |
5208debd TG |
1626 | err = -EAFNOSUPPORT; |
1627 | ||
1da177e4 LT |
1628 | out_dev_put: |
1629 | if (dev) | |
1630 | dev_put(dev); | |
1631 | out: | |
1632 | return err; | |
1633 | } | |
1634 | ||
c7fb64db TG |
1635 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1636 | { | |
ca860fb3 TG |
1637 | struct nlattr *nest; |
1638 | ||
1639 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1640 | if (nest == NULL) | |
1641 | return -ENOBUFS; | |
c7fb64db TG |
1642 | |
1643 | if (parms->dev) | |
ca860fb3 TG |
1644 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
1645 | ||
1646 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); | |
1647 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); | |
1648 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); | |
1649 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); | |
1650 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); | |
1651 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); | |
1652 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); | |
1653 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, | |
c7fb64db | 1654 | parms->base_reachable_time); |
ca860fb3 TG |
1655 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
1656 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); | |
1657 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); | |
1658 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); | |
1659 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); | |
1660 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); | |
c7fb64db | 1661 | |
ca860fb3 | 1662 | return nla_nest_end(skb, nest); |
c7fb64db | 1663 | |
ca860fb3 TG |
1664 | nla_put_failure: |
1665 | return nla_nest_cancel(skb, nest); | |
c7fb64db TG |
1666 | } |
1667 | ||
ca860fb3 TG |
1668 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1669 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1670 | { |
1671 | struct nlmsghdr *nlh; | |
1672 | struct ndtmsg *ndtmsg; | |
1673 | ||
ca860fb3 TG |
1674 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1675 | if (nlh == NULL) | |
26932566 | 1676 | return -EMSGSIZE; |
c7fb64db | 1677 | |
ca860fb3 | 1678 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1679 | |
1680 | read_lock_bh(&tbl->lock); | |
1681 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1682 | ndtmsg->ndtm_pad1 = 0; |
1683 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1684 | |
ca860fb3 TG |
1685 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
1686 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); | |
1687 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); | |
1688 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); | |
1689 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); | |
c7fb64db TG |
1690 | |
1691 | { | |
1692 | unsigned long now = jiffies; | |
1693 | unsigned int flush_delta = now - tbl->last_flush; | |
1694 | unsigned int rand_delta = now - tbl->last_rand; | |
1695 | ||
1696 | struct ndt_config ndc = { | |
1697 | .ndtc_key_len = tbl->key_len, | |
1698 | .ndtc_entry_size = tbl->entry_size, | |
1699 | .ndtc_entries = atomic_read(&tbl->entries), | |
1700 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1701 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
1702 | .ndtc_hash_rnd = tbl->hash_rnd, | |
1703 | .ndtc_hash_mask = tbl->hash_mask, | |
1704 | .ndtc_hash_chain_gc = tbl->hash_chain_gc, | |
1705 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, | |
1706 | }; | |
1707 | ||
ca860fb3 | 1708 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
c7fb64db TG |
1709 | } |
1710 | ||
1711 | { | |
1712 | int cpu; | |
1713 | struct ndt_stats ndst; | |
1714 | ||
1715 | memset(&ndst, 0, sizeof(ndst)); | |
1716 | ||
6f912042 | 1717 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1718 | struct neigh_statistics *st; |
1719 | ||
c7fb64db TG |
1720 | st = per_cpu_ptr(tbl->stats, cpu); |
1721 | ndst.ndts_allocs += st->allocs; | |
1722 | ndst.ndts_destroys += st->destroys; | |
1723 | ndst.ndts_hash_grows += st->hash_grows; | |
1724 | ndst.ndts_res_failed += st->res_failed; | |
1725 | ndst.ndts_lookups += st->lookups; | |
1726 | ndst.ndts_hits += st->hits; | |
1727 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1728 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1729 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1730 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1731 | } | |
1732 | ||
ca860fb3 | 1733 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
c7fb64db TG |
1734 | } |
1735 | ||
1736 | BUG_ON(tbl->parms.dev); | |
1737 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1738 | goto nla_put_failure; |
c7fb64db TG |
1739 | |
1740 | read_unlock_bh(&tbl->lock); | |
ca860fb3 | 1741 | return nlmsg_end(skb, nlh); |
c7fb64db | 1742 | |
ca860fb3 | 1743 | nla_put_failure: |
c7fb64db | 1744 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1745 | nlmsg_cancel(skb, nlh); |
1746 | return -EMSGSIZE; | |
c7fb64db TG |
1747 | } |
1748 | ||
ca860fb3 TG |
1749 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1750 | struct neigh_table *tbl, | |
c7fb64db | 1751 | struct neigh_parms *parms, |
ca860fb3 TG |
1752 | u32 pid, u32 seq, int type, |
1753 | unsigned int flags) | |
c7fb64db TG |
1754 | { |
1755 | struct ndtmsg *ndtmsg; | |
1756 | struct nlmsghdr *nlh; | |
1757 | ||
ca860fb3 TG |
1758 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1759 | if (nlh == NULL) | |
26932566 | 1760 | return -EMSGSIZE; |
c7fb64db | 1761 | |
ca860fb3 | 1762 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1763 | |
1764 | read_lock_bh(&tbl->lock); | |
1765 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1766 | ndtmsg->ndtm_pad1 = 0; |
1767 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1768 | |
ca860fb3 TG |
1769 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1770 | neightbl_fill_parms(skb, parms) < 0) | |
1771 | goto errout; | |
c7fb64db TG |
1772 | |
1773 | read_unlock_bh(&tbl->lock); | |
ca860fb3 TG |
1774 | return nlmsg_end(skb, nlh); |
1775 | errout: | |
c7fb64db | 1776 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1777 | nlmsg_cancel(skb, nlh); |
1778 | return -EMSGSIZE; | |
c7fb64db | 1779 | } |
4ec93edb | 1780 | |
ef7c79ed | 1781 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1782 | [NDTA_NAME] = { .type = NLA_STRING }, |
1783 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1784 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1785 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1786 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1787 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1788 | }; | |
1789 | ||
ef7c79ed | 1790 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1791 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1792 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1793 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1794 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1795 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1796 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
1797 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1798 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1799 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1800 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1801 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1802 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1803 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1804 | }; | |
1805 | ||
c8822a4e | 1806 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
c7fb64db | 1807 | { |
b854272b | 1808 | struct net *net = skb->sk->sk_net; |
c7fb64db | 1809 | struct neigh_table *tbl; |
6b3f8674 TG |
1810 | struct ndtmsg *ndtmsg; |
1811 | struct nlattr *tb[NDTA_MAX+1]; | |
1812 | int err; | |
c7fb64db | 1813 | |
6b3f8674 TG |
1814 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1815 | nl_neightbl_policy); | |
1816 | if (err < 0) | |
1817 | goto errout; | |
c7fb64db | 1818 | |
6b3f8674 TG |
1819 | if (tb[NDTA_NAME] == NULL) { |
1820 | err = -EINVAL; | |
1821 | goto errout; | |
1822 | } | |
1823 | ||
1824 | ndtmsg = nlmsg_data(nlh); | |
c7fb64db TG |
1825 | read_lock(&neigh_tbl_lock); |
1826 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
1827 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) | |
1828 | continue; | |
1829 | ||
6b3f8674 | 1830 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
c7fb64db TG |
1831 | break; |
1832 | } | |
1833 | ||
1834 | if (tbl == NULL) { | |
1835 | err = -ENOENT; | |
6b3f8674 | 1836 | goto errout_locked; |
c7fb64db TG |
1837 | } |
1838 | ||
4ec93edb | 1839 | /* |
c7fb64db TG |
1840 | * We acquire tbl->lock to be nice to the periodic timers and |
1841 | * make sure they always see a consistent set of values. | |
1842 | */ | |
1843 | write_lock_bh(&tbl->lock); | |
1844 | ||
6b3f8674 TG |
1845 | if (tb[NDTA_PARMS]) { |
1846 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1847 | struct neigh_parms *p; |
6b3f8674 | 1848 | int i, ifindex = 0; |
c7fb64db | 1849 | |
6b3f8674 TG |
1850 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1851 | nl_ntbl_parm_policy); | |
1852 | if (err < 0) | |
1853 | goto errout_tbl_lock; | |
c7fb64db | 1854 | |
6b3f8674 TG |
1855 | if (tbp[NDTPA_IFINDEX]) |
1856 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1857 | |
426b5303 | 1858 | p = lookup_neigh_params(tbl, net, ifindex); |
c7fb64db TG |
1859 | if (p == NULL) { |
1860 | err = -ENOENT; | |
6b3f8674 | 1861 | goto errout_tbl_lock; |
c7fb64db | 1862 | } |
c7fb64db | 1863 | |
6b3f8674 TG |
1864 | for (i = 1; i <= NDTPA_MAX; i++) { |
1865 | if (tbp[i] == NULL) | |
1866 | continue; | |
c7fb64db | 1867 | |
6b3f8674 TG |
1868 | switch (i) { |
1869 | case NDTPA_QUEUE_LEN: | |
1870 | p->queue_len = nla_get_u32(tbp[i]); | |
1871 | break; | |
1872 | case NDTPA_PROXY_QLEN: | |
1873 | p->proxy_qlen = nla_get_u32(tbp[i]); | |
1874 | break; | |
1875 | case NDTPA_APP_PROBES: | |
1876 | p->app_probes = nla_get_u32(tbp[i]); | |
1877 | break; | |
1878 | case NDTPA_UCAST_PROBES: | |
1879 | p->ucast_probes = nla_get_u32(tbp[i]); | |
1880 | break; | |
1881 | case NDTPA_MCAST_PROBES: | |
1882 | p->mcast_probes = nla_get_u32(tbp[i]); | |
1883 | break; | |
1884 | case NDTPA_BASE_REACHABLE_TIME: | |
1885 | p->base_reachable_time = nla_get_msecs(tbp[i]); | |
1886 | break; | |
1887 | case NDTPA_GC_STALETIME: | |
1888 | p->gc_staletime = nla_get_msecs(tbp[i]); | |
1889 | break; | |
1890 | case NDTPA_DELAY_PROBE_TIME: | |
1891 | p->delay_probe_time = nla_get_msecs(tbp[i]); | |
1892 | break; | |
1893 | case NDTPA_RETRANS_TIME: | |
1894 | p->retrans_time = nla_get_msecs(tbp[i]); | |
1895 | break; | |
1896 | case NDTPA_ANYCAST_DELAY: | |
1897 | p->anycast_delay = nla_get_msecs(tbp[i]); | |
1898 | break; | |
1899 | case NDTPA_PROXY_DELAY: | |
1900 | p->proxy_delay = nla_get_msecs(tbp[i]); | |
1901 | break; | |
1902 | case NDTPA_LOCKTIME: | |
1903 | p->locktime = nla_get_msecs(tbp[i]); | |
1904 | break; | |
1905 | } | |
1906 | } | |
1907 | } | |
c7fb64db | 1908 | |
6b3f8674 TG |
1909 | if (tb[NDTA_THRESH1]) |
1910 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 1911 | |
6b3f8674 TG |
1912 | if (tb[NDTA_THRESH2]) |
1913 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 1914 | |
6b3f8674 TG |
1915 | if (tb[NDTA_THRESH3]) |
1916 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 1917 | |
6b3f8674 TG |
1918 | if (tb[NDTA_GC_INTERVAL]) |
1919 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
1920 | |
1921 | err = 0; | |
1922 | ||
6b3f8674 | 1923 | errout_tbl_lock: |
c7fb64db | 1924 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 1925 | errout_locked: |
c7fb64db | 1926 | read_unlock(&neigh_tbl_lock); |
6b3f8674 | 1927 | errout: |
c7fb64db TG |
1928 | return err; |
1929 | } | |
1930 | ||
c8822a4e | 1931 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 1932 | { |
b854272b | 1933 | struct net *net = skb->sk->sk_net; |
ca860fb3 TG |
1934 | int family, tidx, nidx = 0; |
1935 | int tbl_skip = cb->args[0]; | |
1936 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
1937 | struct neigh_table *tbl; |
1938 | ||
ca860fb3 | 1939 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db TG |
1940 | |
1941 | read_lock(&neigh_tbl_lock); | |
ca860fb3 | 1942 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
c7fb64db TG |
1943 | struct neigh_parms *p; |
1944 | ||
ca860fb3 | 1945 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
1946 | continue; |
1947 | ||
ca860fb3 TG |
1948 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
1949 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, | |
1950 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1951 | break; |
1952 | ||
426b5303 EB |
1953 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
1954 | if (net != p->net) | |
1955 | continue; | |
1956 | ||
1957 | if (nidx++ < neigh_skip) | |
c7fb64db TG |
1958 | continue; |
1959 | ||
ca860fb3 TG |
1960 | if (neightbl_fill_param_info(skb, tbl, p, |
1961 | NETLINK_CB(cb->skb).pid, | |
1962 | cb->nlh->nlmsg_seq, | |
1963 | RTM_NEWNEIGHTBL, | |
1964 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1965 | goto out; |
1966 | } | |
1967 | ||
ca860fb3 | 1968 | neigh_skip = 0; |
c7fb64db TG |
1969 | } |
1970 | out: | |
1971 | read_unlock(&neigh_tbl_lock); | |
ca860fb3 TG |
1972 | cb->args[0] = tidx; |
1973 | cb->args[1] = nidx; | |
c7fb64db TG |
1974 | |
1975 | return skb->len; | |
1976 | } | |
1da177e4 | 1977 | |
8b8aec50 TG |
1978 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
1979 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
1980 | { |
1981 | unsigned long now = jiffies; | |
1da177e4 | 1982 | struct nda_cacheinfo ci; |
8b8aec50 TG |
1983 | struct nlmsghdr *nlh; |
1984 | struct ndmsg *ndm; | |
1985 | ||
1986 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
1987 | if (nlh == NULL) | |
26932566 | 1988 | return -EMSGSIZE; |
1da177e4 | 1989 | |
8b8aec50 TG |
1990 | ndm = nlmsg_data(nlh); |
1991 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
1992 | ndm->ndm_pad1 = 0; |
1993 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
1994 | ndm->ndm_flags = neigh->flags; |
1995 | ndm->ndm_type = neigh->type; | |
1996 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 1997 | |
8b8aec50 TG |
1998 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
1999 | ||
2000 | read_lock_bh(&neigh->lock); | |
2001 | ndm->ndm_state = neigh->nud_state; | |
2002 | if ((neigh->nud_state & NUD_VALID) && | |
2003 | nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, neigh->ha) < 0) { | |
2004 | read_unlock_bh(&neigh->lock); | |
2005 | goto nla_put_failure; | |
2006 | } | |
2007 | ||
2008 | ci.ndm_used = now - neigh->used; | |
2009 | ci.ndm_confirmed = now - neigh->confirmed; | |
2010 | ci.ndm_updated = now - neigh->updated; | |
2011 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; | |
2012 | read_unlock_bh(&neigh->lock); | |
2013 | ||
2014 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); | |
2015 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); | |
2016 | ||
2017 | return nlmsg_end(skb, nlh); | |
2018 | ||
2019 | nla_put_failure: | |
26932566 PM |
2020 | nlmsg_cancel(skb, nlh); |
2021 | return -EMSGSIZE; | |
1da177e4 LT |
2022 | } |
2023 | ||
d961db35 TG |
2024 | static void neigh_update_notify(struct neighbour *neigh) |
2025 | { | |
2026 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2027 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2028 | } | |
1da177e4 LT |
2029 | |
2030 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2031 | struct netlink_callback *cb) | |
2032 | { | |
426b5303 | 2033 | struct net * net = skb->sk->sk_net; |
1da177e4 LT |
2034 | struct neighbour *n; |
2035 | int rc, h, s_h = cb->args[1]; | |
2036 | int idx, s_idx = idx = cb->args[2]; | |
2037 | ||
c5e29460 | 2038 | read_lock_bh(&tbl->lock); |
1da177e4 LT |
2039 | for (h = 0; h <= tbl->hash_mask; h++) { |
2040 | if (h < s_h) | |
2041 | continue; | |
2042 | if (h > s_h) | |
2043 | s_idx = 0; | |
426b5303 EB |
2044 | for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next) { |
2045 | int lidx; | |
2046 | if (n->dev->nd_net != net) | |
2047 | continue; | |
2048 | lidx = idx++; | |
2049 | if (lidx < s_idx) | |
1da177e4 LT |
2050 | continue; |
2051 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, | |
2052 | cb->nlh->nlmsg_seq, | |
b6544c0b JHS |
2053 | RTM_NEWNEIGH, |
2054 | NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2055 | read_unlock_bh(&tbl->lock); |
2056 | rc = -1; | |
2057 | goto out; | |
2058 | } | |
2059 | } | |
1da177e4 | 2060 | } |
c5e29460 | 2061 | read_unlock_bh(&tbl->lock); |
1da177e4 LT |
2062 | rc = skb->len; |
2063 | out: | |
2064 | cb->args[1] = h; | |
2065 | cb->args[2] = idx; | |
2066 | return rc; | |
2067 | } | |
2068 | ||
c8822a4e | 2069 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2070 | { |
2071 | struct neigh_table *tbl; | |
2072 | int t, family, s_t; | |
2073 | ||
2074 | read_lock(&neigh_tbl_lock); | |
8b8aec50 | 2075 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
1da177e4 LT |
2076 | s_t = cb->args[0]; |
2077 | ||
2078 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { | |
2079 | if (t < s_t || (family && tbl->family != family)) | |
2080 | continue; | |
2081 | if (t > s_t) | |
2082 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2083 | sizeof(cb->args[0])); | |
2084 | if (neigh_dump_table(tbl, skb, cb) < 0) | |
2085 | break; | |
2086 | } | |
2087 | read_unlock(&neigh_tbl_lock); | |
2088 | ||
2089 | cb->args[0] = t; | |
2090 | return skb->len; | |
2091 | } | |
2092 | ||
2093 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2094 | { | |
2095 | int chain; | |
2096 | ||
2097 | read_lock_bh(&tbl->lock); | |
2098 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2099 | struct neighbour *n; | |
2100 | ||
2101 | for (n = tbl->hash_buckets[chain]; n; n = n->next) | |
2102 | cb(n, cookie); | |
2103 | } | |
2104 | read_unlock_bh(&tbl->lock); | |
2105 | } | |
2106 | EXPORT_SYMBOL(neigh_for_each); | |
2107 | ||
2108 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2109 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2110 | int (*cb)(struct neighbour *)) | |
2111 | { | |
2112 | int chain; | |
2113 | ||
2114 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2115 | struct neighbour *n, **np; | |
2116 | ||
2117 | np = &tbl->hash_buckets[chain]; | |
2118 | while ((n = *np) != NULL) { | |
2119 | int release; | |
2120 | ||
2121 | write_lock(&n->lock); | |
2122 | release = cb(n); | |
2123 | if (release) { | |
2124 | *np = n->next; | |
2125 | n->dead = 1; | |
2126 | } else | |
2127 | np = &n->next; | |
2128 | write_unlock(&n->lock); | |
4f494554 TG |
2129 | if (release) |
2130 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2131 | } |
2132 | } | |
2133 | } | |
2134 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2135 | ||
2136 | #ifdef CONFIG_PROC_FS | |
2137 | ||
2138 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2139 | { | |
2140 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2141 | struct net *net = state->p.net; |
1da177e4 LT |
2142 | struct neigh_table *tbl = state->tbl; |
2143 | struct neighbour *n = NULL; | |
2144 | int bucket = state->bucket; | |
2145 | ||
2146 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
2147 | for (bucket = 0; bucket <= tbl->hash_mask; bucket++) { | |
2148 | n = tbl->hash_buckets[bucket]; | |
2149 | ||
2150 | while (n) { | |
426b5303 EB |
2151 | if (n->dev->nd_net != net) |
2152 | goto next; | |
1da177e4 LT |
2153 | if (state->neigh_sub_iter) { |
2154 | loff_t fakep = 0; | |
2155 | void *v; | |
2156 | ||
2157 | v = state->neigh_sub_iter(state, n, &fakep); | |
2158 | if (!v) | |
2159 | goto next; | |
2160 | } | |
2161 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2162 | break; | |
2163 | if (n->nud_state & ~NUD_NOARP) | |
2164 | break; | |
2165 | next: | |
2166 | n = n->next; | |
2167 | } | |
2168 | ||
2169 | if (n) | |
2170 | break; | |
2171 | } | |
2172 | state->bucket = bucket; | |
2173 | ||
2174 | return n; | |
2175 | } | |
2176 | ||
2177 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2178 | struct neighbour *n, | |
2179 | loff_t *pos) | |
2180 | { | |
2181 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2182 | struct net *net = state->p.net; |
1da177e4 LT |
2183 | struct neigh_table *tbl = state->tbl; |
2184 | ||
2185 | if (state->neigh_sub_iter) { | |
2186 | void *v = state->neigh_sub_iter(state, n, pos); | |
2187 | if (v) | |
2188 | return n; | |
2189 | } | |
2190 | n = n->next; | |
2191 | ||
2192 | while (1) { | |
2193 | while (n) { | |
426b5303 EB |
2194 | if (n->dev->nd_net != net) |
2195 | goto next; | |
1da177e4 LT |
2196 | if (state->neigh_sub_iter) { |
2197 | void *v = state->neigh_sub_iter(state, n, pos); | |
2198 | if (v) | |
2199 | return n; | |
2200 | goto next; | |
2201 | } | |
2202 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2203 | break; | |
2204 | ||
2205 | if (n->nud_state & ~NUD_NOARP) | |
2206 | break; | |
2207 | next: | |
2208 | n = n->next; | |
2209 | } | |
2210 | ||
2211 | if (n) | |
2212 | break; | |
2213 | ||
2214 | if (++state->bucket > tbl->hash_mask) | |
2215 | break; | |
2216 | ||
2217 | n = tbl->hash_buckets[state->bucket]; | |
2218 | } | |
2219 | ||
2220 | if (n && pos) | |
2221 | --(*pos); | |
2222 | return n; | |
2223 | } | |
2224 | ||
2225 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2226 | { | |
2227 | struct neighbour *n = neigh_get_first(seq); | |
2228 | ||
2229 | if (n) { | |
2230 | while (*pos) { | |
2231 | n = neigh_get_next(seq, n, pos); | |
2232 | if (!n) | |
2233 | break; | |
2234 | } | |
2235 | } | |
2236 | return *pos ? NULL : n; | |
2237 | } | |
2238 | ||
2239 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2240 | { | |
2241 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2242 | struct net * net = state->p.net; |
1da177e4 LT |
2243 | struct neigh_table *tbl = state->tbl; |
2244 | struct pneigh_entry *pn = NULL; | |
2245 | int bucket = state->bucket; | |
2246 | ||
2247 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2248 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2249 | pn = tbl->phash_buckets[bucket]; | |
426b5303 EB |
2250 | while (pn && (pn->net != net)) |
2251 | pn = pn->next; | |
1da177e4 LT |
2252 | if (pn) |
2253 | break; | |
2254 | } | |
2255 | state->bucket = bucket; | |
2256 | ||
2257 | return pn; | |
2258 | } | |
2259 | ||
2260 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2261 | struct pneigh_entry *pn, | |
2262 | loff_t *pos) | |
2263 | { | |
2264 | struct neigh_seq_state *state = seq->private; | |
42508461 | 2265 | struct net * net = state->p.net; |
1da177e4 LT |
2266 | struct neigh_table *tbl = state->tbl; |
2267 | ||
2268 | pn = pn->next; | |
2269 | while (!pn) { | |
2270 | if (++state->bucket > PNEIGH_HASHMASK) | |
2271 | break; | |
2272 | pn = tbl->phash_buckets[state->bucket]; | |
426b5303 EB |
2273 | while (pn && (pn->net != net)) |
2274 | pn = pn->next; | |
1da177e4 LT |
2275 | if (pn) |
2276 | break; | |
2277 | } | |
2278 | ||
2279 | if (pn && pos) | |
2280 | --(*pos); | |
2281 | ||
2282 | return pn; | |
2283 | } | |
2284 | ||
2285 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2286 | { | |
2287 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2288 | ||
2289 | if (pn) { | |
2290 | while (*pos) { | |
2291 | pn = pneigh_get_next(seq, pn, pos); | |
2292 | if (!pn) | |
2293 | break; | |
2294 | } | |
2295 | } | |
2296 | return *pos ? NULL : pn; | |
2297 | } | |
2298 | ||
2299 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2300 | { | |
2301 | struct neigh_seq_state *state = seq->private; | |
2302 | void *rc; | |
2303 | ||
2304 | rc = neigh_get_idx(seq, pos); | |
2305 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2306 | rc = pneigh_get_idx(seq, pos); | |
2307 | ||
2308 | return rc; | |
2309 | } | |
2310 | ||
2311 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
9a429c49 | 2312 | __acquires(tbl->lock) |
1da177e4 LT |
2313 | { |
2314 | struct neigh_seq_state *state = seq->private; | |
2315 | loff_t pos_minus_one; | |
2316 | ||
2317 | state->tbl = tbl; | |
2318 | state->bucket = 0; | |
2319 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2320 | ||
2321 | read_lock_bh(&tbl->lock); | |
2322 | ||
2323 | pos_minus_one = *pos - 1; | |
2324 | return *pos ? neigh_get_idx_any(seq, &pos_minus_one) : SEQ_START_TOKEN; | |
2325 | } | |
2326 | EXPORT_SYMBOL(neigh_seq_start); | |
2327 | ||
2328 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2329 | { | |
2330 | struct neigh_seq_state *state; | |
2331 | void *rc; | |
2332 | ||
2333 | if (v == SEQ_START_TOKEN) { | |
2334 | rc = neigh_get_idx(seq, pos); | |
2335 | goto out; | |
2336 | } | |
2337 | ||
2338 | state = seq->private; | |
2339 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2340 | rc = neigh_get_next(seq, v, NULL); | |
2341 | if (rc) | |
2342 | goto out; | |
2343 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2344 | rc = pneigh_get_first(seq); | |
2345 | } else { | |
2346 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2347 | rc = pneigh_get_next(seq, v, NULL); | |
2348 | } | |
2349 | out: | |
2350 | ++(*pos); | |
2351 | return rc; | |
2352 | } | |
2353 | EXPORT_SYMBOL(neigh_seq_next); | |
2354 | ||
2355 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2356 | __releases(tbl->lock) |
1da177e4 LT |
2357 | { |
2358 | struct neigh_seq_state *state = seq->private; | |
2359 | struct neigh_table *tbl = state->tbl; | |
2360 | ||
2361 | read_unlock_bh(&tbl->lock); | |
2362 | } | |
2363 | EXPORT_SYMBOL(neigh_seq_stop); | |
2364 | ||
2365 | /* statistics via seq_file */ | |
2366 | ||
2367 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2368 | { | |
2369 | struct proc_dir_entry *pde = seq->private; | |
2370 | struct neigh_table *tbl = pde->data; | |
2371 | int cpu; | |
2372 | ||
2373 | if (*pos == 0) | |
2374 | return SEQ_START_TOKEN; | |
4ec93edb | 2375 | |
1da177e4 LT |
2376 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { |
2377 | if (!cpu_possible(cpu)) | |
2378 | continue; | |
2379 | *pos = cpu+1; | |
2380 | return per_cpu_ptr(tbl->stats, cpu); | |
2381 | } | |
2382 | return NULL; | |
2383 | } | |
2384 | ||
2385 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2386 | { | |
2387 | struct proc_dir_entry *pde = seq->private; | |
2388 | struct neigh_table *tbl = pde->data; | |
2389 | int cpu; | |
2390 | ||
2391 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { | |
2392 | if (!cpu_possible(cpu)) | |
2393 | continue; | |
2394 | *pos = cpu+1; | |
2395 | return per_cpu_ptr(tbl->stats, cpu); | |
2396 | } | |
2397 | return NULL; | |
2398 | } | |
2399 | ||
2400 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2401 | { | |
2402 | ||
2403 | } | |
2404 | ||
2405 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2406 | { | |
2407 | struct proc_dir_entry *pde = seq->private; | |
2408 | struct neigh_table *tbl = pde->data; | |
2409 | struct neigh_statistics *st = v; | |
2410 | ||
2411 | if (v == SEQ_START_TOKEN) { | |
5bec0039 | 2412 | 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 |
2413 | return 0; |
2414 | } | |
2415 | ||
2416 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
2417 | "%08lx %08lx %08lx %08lx\n", | |
2418 | atomic_read(&tbl->entries), | |
2419 | ||
2420 | st->allocs, | |
2421 | st->destroys, | |
2422 | st->hash_grows, | |
2423 | ||
2424 | st->lookups, | |
2425 | st->hits, | |
2426 | ||
2427 | st->res_failed, | |
2428 | ||
2429 | st->rcv_probes_mcast, | |
2430 | st->rcv_probes_ucast, | |
2431 | ||
2432 | st->periodic_gc_runs, | |
2433 | st->forced_gc_runs | |
2434 | ); | |
2435 | ||
2436 | return 0; | |
2437 | } | |
2438 | ||
f690808e | 2439 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2440 | .start = neigh_stat_seq_start, |
2441 | .next = neigh_stat_seq_next, | |
2442 | .stop = neigh_stat_seq_stop, | |
2443 | .show = neigh_stat_seq_show, | |
2444 | }; | |
2445 | ||
2446 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2447 | { | |
2448 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2449 | ||
2450 | if (!ret) { | |
2451 | struct seq_file *sf = file->private_data; | |
2452 | sf->private = PDE(inode); | |
2453 | } | |
2454 | return ret; | |
2455 | }; | |
2456 | ||
9a32144e | 2457 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2458 | .owner = THIS_MODULE, |
2459 | .open = neigh_stat_seq_open, | |
2460 | .read = seq_read, | |
2461 | .llseek = seq_lseek, | |
2462 | .release = seq_release, | |
2463 | }; | |
2464 | ||
2465 | #endif /* CONFIG_PROC_FS */ | |
2466 | ||
339bf98f TG |
2467 | static inline size_t neigh_nlmsg_size(void) |
2468 | { | |
2469 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2470 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2471 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2472 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2473 | + nla_total_size(4); /* NDA_PROBES */ | |
2474 | } | |
2475 | ||
b8673311 | 2476 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2477 | { |
426b5303 | 2478 | struct net *net = n->dev->nd_net; |
8b8aec50 | 2479 | struct sk_buff *skb; |
b8673311 | 2480 | int err = -ENOBUFS; |
1da177e4 | 2481 | |
339bf98f | 2482 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2483 | if (skb == NULL) |
b8673311 | 2484 | goto errout; |
1da177e4 | 2485 | |
b8673311 | 2486 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2487 | if (err < 0) { |
2488 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2489 | WARN_ON(err == -EMSGSIZE); | |
2490 | kfree_skb(skb); | |
2491 | goto errout; | |
2492 | } | |
426b5303 | 2493 | err = rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
b8673311 TG |
2494 | errout: |
2495 | if (err < 0) | |
426b5303 | 2496 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2497 | } |
2498 | ||
d961db35 | 2499 | #ifdef CONFIG_ARPD |
b8673311 | 2500 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2501 | { |
b8673311 TG |
2502 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2503 | } | |
1da177e4 LT |
2504 | #endif /* CONFIG_ARPD */ |
2505 | ||
2506 | #ifdef CONFIG_SYSCTL | |
2507 | ||
2508 | static struct neigh_sysctl_table { | |
2509 | struct ctl_table_header *sysctl_header; | |
c3bac5a7 PE |
2510 | struct ctl_table neigh_vars[__NET_NEIGH_MAX]; |
2511 | char *dev_name; | |
ab32ea5d | 2512 | } neigh_sysctl_template __read_mostly = { |
1da177e4 LT |
2513 | .neigh_vars = { |
2514 | { | |
2515 | .ctl_name = NET_NEIGH_MCAST_SOLICIT, | |
2516 | .procname = "mcast_solicit", | |
2517 | .maxlen = sizeof(int), | |
2518 | .mode = 0644, | |
2519 | .proc_handler = &proc_dointvec, | |
2520 | }, | |
2521 | { | |
2522 | .ctl_name = NET_NEIGH_UCAST_SOLICIT, | |
2523 | .procname = "ucast_solicit", | |
2524 | .maxlen = sizeof(int), | |
2525 | .mode = 0644, | |
2526 | .proc_handler = &proc_dointvec, | |
2527 | }, | |
2528 | { | |
2529 | .ctl_name = NET_NEIGH_APP_SOLICIT, | |
2530 | .procname = "app_solicit", | |
2531 | .maxlen = sizeof(int), | |
2532 | .mode = 0644, | |
2533 | .proc_handler = &proc_dointvec, | |
2534 | }, | |
2535 | { | |
1da177e4 LT |
2536 | .procname = "retrans_time", |
2537 | .maxlen = sizeof(int), | |
2538 | .mode = 0644, | |
2539 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2540 | }, | |
2541 | { | |
2542 | .ctl_name = NET_NEIGH_REACHABLE_TIME, | |
2543 | .procname = "base_reachable_time", | |
2544 | .maxlen = sizeof(int), | |
2545 | .mode = 0644, | |
2546 | .proc_handler = &proc_dointvec_jiffies, | |
2547 | .strategy = &sysctl_jiffies, | |
2548 | }, | |
2549 | { | |
2550 | .ctl_name = NET_NEIGH_DELAY_PROBE_TIME, | |
2551 | .procname = "delay_first_probe_time", | |
2552 | .maxlen = sizeof(int), | |
2553 | .mode = 0644, | |
2554 | .proc_handler = &proc_dointvec_jiffies, | |
2555 | .strategy = &sysctl_jiffies, | |
2556 | }, | |
2557 | { | |
2558 | .ctl_name = NET_NEIGH_GC_STALE_TIME, | |
2559 | .procname = "gc_stale_time", | |
2560 | .maxlen = sizeof(int), | |
2561 | .mode = 0644, | |
2562 | .proc_handler = &proc_dointvec_jiffies, | |
2563 | .strategy = &sysctl_jiffies, | |
2564 | }, | |
2565 | { | |
2566 | .ctl_name = NET_NEIGH_UNRES_QLEN, | |
2567 | .procname = "unres_qlen", | |
2568 | .maxlen = sizeof(int), | |
2569 | .mode = 0644, | |
2570 | .proc_handler = &proc_dointvec, | |
2571 | }, | |
2572 | { | |
2573 | .ctl_name = NET_NEIGH_PROXY_QLEN, | |
2574 | .procname = "proxy_qlen", | |
2575 | .maxlen = sizeof(int), | |
2576 | .mode = 0644, | |
2577 | .proc_handler = &proc_dointvec, | |
2578 | }, | |
2579 | { | |
1da177e4 LT |
2580 | .procname = "anycast_delay", |
2581 | .maxlen = sizeof(int), | |
2582 | .mode = 0644, | |
2583 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2584 | }, | |
2585 | { | |
1da177e4 LT |
2586 | .procname = "proxy_delay", |
2587 | .maxlen = sizeof(int), | |
2588 | .mode = 0644, | |
2589 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2590 | }, | |
2591 | { | |
1da177e4 LT |
2592 | .procname = "locktime", |
2593 | .maxlen = sizeof(int), | |
2594 | .mode = 0644, | |
2595 | .proc_handler = &proc_dointvec_userhz_jiffies, | |
2596 | }, | |
d12af679 EB |
2597 | { |
2598 | .ctl_name = NET_NEIGH_RETRANS_TIME_MS, | |
2599 | .procname = "retrans_time_ms", | |
2600 | .maxlen = sizeof(int), | |
2601 | .mode = 0644, | |
2602 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2603 | .strategy = &sysctl_ms_jiffies, | |
2604 | }, | |
2605 | { | |
2606 | .ctl_name = NET_NEIGH_REACHABLE_TIME_MS, | |
2607 | .procname = "base_reachable_time_ms", | |
2608 | .maxlen = sizeof(int), | |
2609 | .mode = 0644, | |
2610 | .proc_handler = &proc_dointvec_ms_jiffies, | |
2611 | .strategy = &sysctl_ms_jiffies, | |
2612 | }, | |
1da177e4 LT |
2613 | { |
2614 | .ctl_name = NET_NEIGH_GC_INTERVAL, | |
2615 | .procname = "gc_interval", | |
2616 | .maxlen = sizeof(int), | |
2617 | .mode = 0644, | |
2618 | .proc_handler = &proc_dointvec_jiffies, | |
2619 | .strategy = &sysctl_jiffies, | |
2620 | }, | |
2621 | { | |
2622 | .ctl_name = NET_NEIGH_GC_THRESH1, | |
2623 | .procname = "gc_thresh1", | |
2624 | .maxlen = sizeof(int), | |
2625 | .mode = 0644, | |
2626 | .proc_handler = &proc_dointvec, | |
2627 | }, | |
2628 | { | |
2629 | .ctl_name = NET_NEIGH_GC_THRESH2, | |
2630 | .procname = "gc_thresh2", | |
2631 | .maxlen = sizeof(int), | |
2632 | .mode = 0644, | |
2633 | .proc_handler = &proc_dointvec, | |
2634 | }, | |
2635 | { | |
2636 | .ctl_name = NET_NEIGH_GC_THRESH3, | |
2637 | .procname = "gc_thresh3", | |
2638 | .maxlen = sizeof(int), | |
2639 | .mode = 0644, | |
2640 | .proc_handler = &proc_dointvec, | |
2641 | }, | |
c3bac5a7 | 2642 | {}, |
1da177e4 LT |
2643 | }, |
2644 | }; | |
2645 | ||
2646 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
4ec93edb | 2647 | int p_id, int pdev_id, char *p_name, |
1da177e4 LT |
2648 | proc_handler *handler, ctl_handler *strategy) |
2649 | { | |
3c607bbb | 2650 | struct neigh_sysctl_table *t; |
1da177e4 | 2651 | const char *dev_name_source = NULL; |
c3bac5a7 PE |
2652 | |
2653 | #define NEIGH_CTL_PATH_ROOT 0 | |
2654 | #define NEIGH_CTL_PATH_PROTO 1 | |
2655 | #define NEIGH_CTL_PATH_NEIGH 2 | |
2656 | #define NEIGH_CTL_PATH_DEV 3 | |
2657 | ||
2658 | struct ctl_path neigh_path[] = { | |
2659 | { .procname = "net", .ctl_name = CTL_NET, }, | |
2660 | { .procname = "proto", .ctl_name = 0, }, | |
2661 | { .procname = "neigh", .ctl_name = 0, }, | |
2662 | { .procname = "default", .ctl_name = NET_PROTO_CONF_DEFAULT, }, | |
2663 | { }, | |
2664 | }; | |
1da177e4 | 2665 | |
3c607bbb | 2666 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2667 | if (!t) |
3c607bbb PE |
2668 | goto err; |
2669 | ||
1da177e4 LT |
2670 | t->neigh_vars[0].data = &p->mcast_probes; |
2671 | t->neigh_vars[1].data = &p->ucast_probes; | |
2672 | t->neigh_vars[2].data = &p->app_probes; | |
2673 | t->neigh_vars[3].data = &p->retrans_time; | |
2674 | t->neigh_vars[4].data = &p->base_reachable_time; | |
2675 | t->neigh_vars[5].data = &p->delay_probe_time; | |
2676 | t->neigh_vars[6].data = &p->gc_staletime; | |
2677 | t->neigh_vars[7].data = &p->queue_len; | |
2678 | t->neigh_vars[8].data = &p->proxy_qlen; | |
2679 | t->neigh_vars[9].data = &p->anycast_delay; | |
2680 | t->neigh_vars[10].data = &p->proxy_delay; | |
2681 | t->neigh_vars[11].data = &p->locktime; | |
d12af679 EB |
2682 | t->neigh_vars[12].data = &p->retrans_time; |
2683 | t->neigh_vars[13].data = &p->base_reachable_time; | |
1da177e4 LT |
2684 | |
2685 | if (dev) { | |
2686 | dev_name_source = dev->name; | |
c3bac5a7 | 2687 | neigh_path[NEIGH_CTL_PATH_DEV].ctl_name = dev->ifindex; |
d12af679 EB |
2688 | /* Terminate the table early */ |
2689 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); | |
1da177e4 | 2690 | } else { |
c3bac5a7 | 2691 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
d12af679 EB |
2692 | t->neigh_vars[14].data = (int *)(p + 1); |
2693 | t->neigh_vars[15].data = (int *)(p + 1) + 1; | |
2694 | t->neigh_vars[16].data = (int *)(p + 1) + 2; | |
2695 | t->neigh_vars[17].data = (int *)(p + 1) + 3; | |
1da177e4 LT |
2696 | } |
2697 | ||
1da177e4 LT |
2698 | |
2699 | if (handler || strategy) { | |
2700 | /* RetransTime */ | |
2701 | t->neigh_vars[3].proc_handler = handler; | |
2702 | t->neigh_vars[3].strategy = strategy; | |
2703 | t->neigh_vars[3].extra1 = dev; | |
d12af679 EB |
2704 | if (!strategy) |
2705 | t->neigh_vars[3].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2706 | /* ReachableTime */ |
2707 | t->neigh_vars[4].proc_handler = handler; | |
2708 | t->neigh_vars[4].strategy = strategy; | |
2709 | t->neigh_vars[4].extra1 = dev; | |
d12af679 EB |
2710 | if (!strategy) |
2711 | t->neigh_vars[4].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2712 | /* RetransTime (in milliseconds)*/ |
d12af679 EB |
2713 | t->neigh_vars[12].proc_handler = handler; |
2714 | t->neigh_vars[12].strategy = strategy; | |
2715 | t->neigh_vars[12].extra1 = dev; | |
2716 | if (!strategy) | |
2717 | t->neigh_vars[12].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2718 | /* ReachableTime (in milliseconds) */ |
d12af679 EB |
2719 | t->neigh_vars[13].proc_handler = handler; |
2720 | t->neigh_vars[13].strategy = strategy; | |
2721 | t->neigh_vars[13].extra1 = dev; | |
2722 | if (!strategy) | |
2723 | t->neigh_vars[13].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2724 | } |
2725 | ||
c3bac5a7 PE |
2726 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
2727 | if (!t->dev_name) | |
1da177e4 | 2728 | goto free; |
1da177e4 | 2729 | |
c3bac5a7 PE |
2730 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
2731 | neigh_path[NEIGH_CTL_PATH_NEIGH].ctl_name = pdev_id; | |
2732 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; | |
2733 | neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id; | |
1da177e4 | 2734 | |
c3bac5a7 | 2735 | t->sysctl_header = register_sysctl_paths(neigh_path, t->neigh_vars); |
3c607bbb | 2736 | if (!t->sysctl_header) |
1da177e4 | 2737 | goto free_procname; |
3c607bbb | 2738 | |
1da177e4 LT |
2739 | p->sysctl_table = t; |
2740 | return 0; | |
2741 | ||
3c607bbb | 2742 | free_procname: |
c3bac5a7 | 2743 | kfree(t->dev_name); |
3c607bbb | 2744 | free: |
1da177e4 | 2745 | kfree(t); |
3c607bbb PE |
2746 | err: |
2747 | return -ENOBUFS; | |
1da177e4 LT |
2748 | } |
2749 | ||
2750 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
2751 | { | |
2752 | if (p->sysctl_table) { | |
2753 | struct neigh_sysctl_table *t = p->sysctl_table; | |
2754 | p->sysctl_table = NULL; | |
2755 | unregister_sysctl_table(t->sysctl_header); | |
c3bac5a7 | 2756 | kfree(t->dev_name); |
1da177e4 LT |
2757 | kfree(t); |
2758 | } | |
2759 | } | |
2760 | ||
2761 | #endif /* CONFIG_SYSCTL */ | |
2762 | ||
c8822a4e TG |
2763 | static int __init neigh_init(void) |
2764 | { | |
2765 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL); | |
2766 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL); | |
2767 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info); | |
2768 | ||
2769 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info); | |
2770 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL); | |
2771 | ||
2772 | return 0; | |
2773 | } | |
2774 | ||
2775 | subsys_initcall(neigh_init); | |
2776 | ||
1da177e4 | 2777 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 LT |
2778 | EXPORT_SYMBOL(neigh_changeaddr); |
2779 | EXPORT_SYMBOL(neigh_compat_output); | |
2780 | EXPORT_SYMBOL(neigh_connected_output); | |
2781 | EXPORT_SYMBOL(neigh_create); | |
1da177e4 | 2782 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
2783 | EXPORT_SYMBOL(neigh_event_ns); |
2784 | EXPORT_SYMBOL(neigh_ifdown); | |
2785 | EXPORT_SYMBOL(neigh_lookup); | |
2786 | EXPORT_SYMBOL(neigh_lookup_nodev); | |
2787 | EXPORT_SYMBOL(neigh_parms_alloc); | |
2788 | EXPORT_SYMBOL(neigh_parms_release); | |
2789 | EXPORT_SYMBOL(neigh_rand_reach_time); | |
2790 | EXPORT_SYMBOL(neigh_resolve_output); | |
2791 | EXPORT_SYMBOL(neigh_table_clear); | |
2792 | EXPORT_SYMBOL(neigh_table_init); | |
bd89efc5 | 2793 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
1da177e4 | 2794 | EXPORT_SYMBOL(neigh_update); |
1da177e4 LT |
2795 | EXPORT_SYMBOL(pneigh_enqueue); |
2796 | EXPORT_SYMBOL(pneigh_lookup); | |
2797 | ||
2798 | #ifdef CONFIG_ARPD | |
2799 | EXPORT_SYMBOL(neigh_app_ns); | |
2800 | #endif | |
2801 | #ifdef CONFIG_SYSCTL | |
2802 | EXPORT_SYMBOL(neigh_sysctl_register); | |
2803 | EXPORT_SYMBOL(neigh_sysctl_unregister); | |
2804 | #endif |