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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Generic address resolution entity | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Fixes: | |
14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
15 | * Harald Welte Add neighbour cache statistics like rtstat | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/socket.h> | |
1da177e4 LT |
22 | #include <linux/netdevice.h> |
23 | #include <linux/proc_fs.h> | |
24 | #ifdef CONFIG_SYSCTL | |
25 | #include <linux/sysctl.h> | |
26 | #endif | |
27 | #include <linux/times.h> | |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 LT |
29 | #include <net/neighbour.h> |
30 | #include <net/dst.h> | |
31 | #include <net/sock.h> | |
8d71740c | 32 | #include <net/netevent.h> |
a14a49d2 | 33 | #include <net/netlink.h> |
1da177e4 LT |
34 | #include <linux/rtnetlink.h> |
35 | #include <linux/random.h> | |
543537bd | 36 | #include <linux/string.h> |
c3609d51 | 37 | #include <linux/log2.h> |
1da177e4 LT |
38 | |
39 | #define NEIGH_DEBUG 1 | |
40 | ||
41 | #define NEIGH_PRINTK(x...) printk(x) | |
42 | #define NEIGH_NOPRINTK(x...) do { ; } while(0) | |
43 | #define NEIGH_PRINTK0 NEIGH_PRINTK | |
44 | #define NEIGH_PRINTK1 NEIGH_NOPRINTK | |
45 | #define NEIGH_PRINTK2 NEIGH_NOPRINTK | |
46 | ||
47 | #if NEIGH_DEBUG >= 1 | |
48 | #undef NEIGH_PRINTK1 | |
49 | #define NEIGH_PRINTK1 NEIGH_PRINTK | |
50 | #endif | |
51 | #if NEIGH_DEBUG >= 2 | |
52 | #undef NEIGH_PRINTK2 | |
53 | #define NEIGH_PRINTK2 NEIGH_PRINTK | |
54 | #endif | |
55 | ||
56 | #define PNEIGH_HASHMASK 0xF | |
57 | ||
58 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
59 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
60 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 61 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 LT |
62 | |
63 | static struct neigh_table *neigh_tables; | |
45fc3b11 | 64 | #ifdef CONFIG_PROC_FS |
9a32144e | 65 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 66 | #endif |
1da177e4 LT |
67 | |
68 | /* | |
69 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
70 | ||
71 | - All the scans/updates to hash buckets MUST be made under this lock. | |
72 | - NOTHING clever should be made under this lock: no callbacks | |
73 | to protocol backends, no attempts to send something to network. | |
74 | It will result in deadlocks, if backend/driver wants to use neighbour | |
75 | cache. | |
76 | - If the entry requires some non-trivial actions, increase | |
77 | its reference count and release table lock. | |
78 | ||
79 | Neighbour entries are protected: | |
80 | - with reference count. | |
81 | - with rwlock neigh->lock | |
82 | ||
83 | Reference count prevents destruction. | |
84 | ||
85 | neigh->lock mainly serializes ll address data and its validity state. | |
86 | However, the same lock is used to protect another entry fields: | |
87 | - timer | |
88 | - resolution queue | |
89 | ||
90 | Again, nothing clever shall be made under neigh->lock, | |
91 | the most complicated procedure, which we allow is dev->hard_header. | |
92 | It is supposed, that dev->hard_header is simplistic and does | |
93 | not make callbacks to neighbour tables. | |
94 | ||
95 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting | |
96 | list of neighbour tables. This list is used only in process context, | |
97 | */ | |
98 | ||
99 | static DEFINE_RWLOCK(neigh_tbl_lock); | |
100 | ||
101 | static int neigh_blackhole(struct sk_buff *skb) | |
102 | { | |
103 | kfree_skb(skb); | |
104 | return -ENETDOWN; | |
105 | } | |
106 | ||
4f494554 TG |
107 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
108 | { | |
109 | if (neigh->parms->neigh_cleanup) | |
110 | neigh->parms->neigh_cleanup(neigh); | |
111 | ||
d961db35 | 112 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
113 | neigh_release(neigh); |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
118 | * It corresponds to default IPv6 settings and is not overridable, | |
119 | * because it is really reasonable choice. | |
120 | */ | |
121 | ||
122 | unsigned long neigh_rand_reach_time(unsigned long base) | |
123 | { | |
124 | return (base ? (net_random() % base) + (base >> 1) : 0); | |
125 | } | |
0a204500 | 126 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 LT |
127 | |
128 | ||
129 | static int neigh_forced_gc(struct neigh_table *tbl) | |
130 | { | |
131 | int shrunk = 0; | |
132 | int i; | |
133 | ||
134 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
135 | ||
136 | write_lock_bh(&tbl->lock); | |
137 | for (i = 0; i <= tbl->hash_mask; i++) { | |
138 | struct neighbour *n, **np; | |
139 | ||
140 | np = &tbl->hash_buckets[i]; | |
141 | while ((n = *np) != NULL) { | |
142 | /* Neighbour record may be discarded if: | |
143 | * - nobody refers to it. | |
144 | * - it is not permanent | |
145 | */ | |
146 | write_lock(&n->lock); | |
147 | if (atomic_read(&n->refcnt) == 1 && | |
148 | !(n->nud_state & NUD_PERMANENT)) { | |
149 | *np = n->next; | |
150 | n->dead = 1; | |
151 | shrunk = 1; | |
152 | write_unlock(&n->lock); | |
4f494554 | 153 | neigh_cleanup_and_release(n); |
1da177e4 LT |
154 | continue; |
155 | } | |
156 | write_unlock(&n->lock); | |
157 | np = &n->next; | |
158 | } | |
159 | } | |
160 | ||
161 | tbl->last_flush = jiffies; | |
162 | ||
163 | write_unlock_bh(&tbl->lock); | |
164 | ||
165 | return shrunk; | |
166 | } | |
167 | ||
a43d8994 PE |
168 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
169 | { | |
170 | neigh_hold(n); | |
171 | if (unlikely(mod_timer(&n->timer, when))) { | |
172 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
173 | n->nud_state); | |
174 | dump_stack(); | |
175 | } | |
176 | } | |
177 | ||
1da177e4 LT |
178 | static int neigh_del_timer(struct neighbour *n) |
179 | { | |
180 | if ((n->nud_state & NUD_IN_TIMER) && | |
181 | del_timer(&n->timer)) { | |
182 | neigh_release(n); | |
183 | return 1; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
189 | { | |
190 | struct sk_buff *skb; | |
191 | ||
192 | while ((skb = skb_dequeue(list)) != NULL) { | |
193 | dev_put(skb->dev); | |
194 | kfree_skb(skb); | |
195 | } | |
196 | } | |
197 | ||
49636bb1 | 198 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
199 | { |
200 | int i; | |
201 | ||
1da177e4 LT |
202 | for (i = 0; i <= tbl->hash_mask; i++) { |
203 | struct neighbour *n, **np = &tbl->hash_buckets[i]; | |
204 | ||
205 | while ((n = *np) != NULL) { | |
206 | if (dev && n->dev != dev) { | |
207 | np = &n->next; | |
208 | continue; | |
209 | } | |
210 | *np = n->next; | |
211 | write_lock(&n->lock); | |
212 | neigh_del_timer(n); | |
213 | n->dead = 1; | |
214 | ||
215 | if (atomic_read(&n->refcnt) != 1) { | |
216 | /* The most unpleasant situation. | |
217 | We must destroy neighbour entry, | |
218 | but someone still uses it. | |
219 | ||
220 | The destroy will be delayed until | |
221 | the last user releases us, but | |
222 | we must kill timers etc. and move | |
223 | it to safe state. | |
224 | */ | |
225 | skb_queue_purge(&n->arp_queue); | |
226 | n->output = neigh_blackhole; | |
227 | if (n->nud_state & NUD_VALID) | |
228 | n->nud_state = NUD_NOARP; | |
229 | else | |
230 | n->nud_state = NUD_NONE; | |
231 | NEIGH_PRINTK2("neigh %p is stray.\n", n); | |
232 | } | |
233 | write_unlock(&n->lock); | |
4f494554 | 234 | neigh_cleanup_and_release(n); |
1da177e4 LT |
235 | } |
236 | } | |
49636bb1 | 237 | } |
1da177e4 | 238 | |
49636bb1 HX |
239 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
240 | { | |
241 | write_lock_bh(&tbl->lock); | |
242 | neigh_flush_dev(tbl, dev); | |
243 | write_unlock_bh(&tbl->lock); | |
244 | } | |
0a204500 | 245 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
246 | |
247 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
248 | { | |
249 | write_lock_bh(&tbl->lock); | |
250 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
251 | pneigh_ifdown(tbl, dev); |
252 | write_unlock_bh(&tbl->lock); | |
253 | ||
254 | del_timer_sync(&tbl->proxy_timer); | |
255 | pneigh_queue_purge(&tbl->proxy_queue); | |
256 | return 0; | |
257 | } | |
0a204500 | 258 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 LT |
259 | |
260 | static struct neighbour *neigh_alloc(struct neigh_table *tbl) | |
261 | { | |
262 | struct neighbour *n = NULL; | |
263 | unsigned long now = jiffies; | |
264 | int entries; | |
265 | ||
266 | entries = atomic_inc_return(&tbl->entries) - 1; | |
267 | if (entries >= tbl->gc_thresh3 || | |
268 | (entries >= tbl->gc_thresh2 && | |
269 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
270 | if (!neigh_forced_gc(tbl) && | |
271 | entries >= tbl->gc_thresh3) | |
272 | goto out_entries; | |
273 | } | |
274 | ||
c3762229 | 275 | n = kmem_cache_zalloc(tbl->kmem_cachep, GFP_ATOMIC); |
1da177e4 LT |
276 | if (!n) |
277 | goto out_entries; | |
278 | ||
1da177e4 LT |
279 | skb_queue_head_init(&n->arp_queue); |
280 | rwlock_init(&n->lock); | |
281 | n->updated = n->used = now; | |
282 | n->nud_state = NUD_NONE; | |
283 | n->output = neigh_blackhole; | |
284 | n->parms = neigh_parms_clone(&tbl->parms); | |
b24b8a24 | 285 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
286 | |
287 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
288 | n->tbl = tbl; | |
289 | atomic_set(&n->refcnt, 1); | |
290 | n->dead = 1; | |
291 | out: | |
292 | return n; | |
293 | ||
294 | out_entries: | |
295 | atomic_dec(&tbl->entries); | |
296 | goto out; | |
297 | } | |
298 | ||
299 | static struct neighbour **neigh_hash_alloc(unsigned int entries) | |
300 | { | |
301 | unsigned long size = entries * sizeof(struct neighbour *); | |
302 | struct neighbour **ret; | |
303 | ||
304 | if (size <= PAGE_SIZE) { | |
77d04bd9 | 305 | ret = kzalloc(size, GFP_ATOMIC); |
1da177e4 LT |
306 | } else { |
307 | ret = (struct neighbour **) | |
77d04bd9 | 308 | __get_free_pages(GFP_ATOMIC|__GFP_ZERO, get_order(size)); |
1da177e4 | 309 | } |
1da177e4 LT |
310 | return ret; |
311 | } | |
312 | ||
313 | static void neigh_hash_free(struct neighbour **hash, unsigned int entries) | |
314 | { | |
315 | unsigned long size = entries * sizeof(struct neighbour *); | |
316 | ||
317 | if (size <= PAGE_SIZE) | |
318 | kfree(hash); | |
319 | else | |
320 | free_pages((unsigned long)hash, get_order(size)); | |
321 | } | |
322 | ||
323 | static void neigh_hash_grow(struct neigh_table *tbl, unsigned long new_entries) | |
324 | { | |
325 | struct neighbour **new_hash, **old_hash; | |
326 | unsigned int i, new_hash_mask, old_entries; | |
327 | ||
328 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
329 | ||
c3609d51 | 330 | BUG_ON(!is_power_of_2(new_entries)); |
1da177e4 LT |
331 | new_hash = neigh_hash_alloc(new_entries); |
332 | if (!new_hash) | |
333 | return; | |
334 | ||
335 | old_entries = tbl->hash_mask + 1; | |
336 | new_hash_mask = new_entries - 1; | |
337 | old_hash = tbl->hash_buckets; | |
338 | ||
339 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); | |
340 | for (i = 0; i < old_entries; i++) { | |
341 | struct neighbour *n, *next; | |
342 | ||
343 | for (n = old_hash[i]; n; n = next) { | |
344 | unsigned int hash_val = tbl->hash(n->primary_key, n->dev); | |
345 | ||
346 | hash_val &= new_hash_mask; | |
347 | next = n->next; | |
348 | ||
349 | n->next = new_hash[hash_val]; | |
350 | new_hash[hash_val] = n; | |
351 | } | |
352 | } | |
353 | tbl->hash_buckets = new_hash; | |
354 | tbl->hash_mask = new_hash_mask; | |
355 | ||
356 | neigh_hash_free(old_hash, old_entries); | |
357 | } | |
358 | ||
359 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
360 | struct net_device *dev) | |
361 | { | |
362 | struct neighbour *n; | |
363 | int key_len = tbl->key_len; | |
bc4bf5f3 | 364 | u32 hash_val; |
4ec93edb | 365 | |
1da177e4 LT |
366 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
367 | ||
368 | read_lock_bh(&tbl->lock); | |
bc4bf5f3 | 369 | hash_val = tbl->hash(pkey, dev); |
c5e29460 | 370 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
1da177e4 LT |
371 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
372 | neigh_hold(n); | |
373 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
374 | break; | |
375 | } | |
376 | } | |
377 | read_unlock_bh(&tbl->lock); | |
378 | return n; | |
379 | } | |
0a204500 | 380 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 381 | |
426b5303 EB |
382 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
383 | const void *pkey) | |
1da177e4 LT |
384 | { |
385 | struct neighbour *n; | |
386 | int key_len = tbl->key_len; | |
bc4bf5f3 | 387 | u32 hash_val; |
1da177e4 LT |
388 | |
389 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
390 | ||
391 | read_lock_bh(&tbl->lock); | |
bc4bf5f3 | 392 | hash_val = tbl->hash(pkey, NULL); |
c5e29460 | 393 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
426b5303 | 394 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 395 | net_eq(dev_net(n->dev), net)) { |
1da177e4 LT |
396 | neigh_hold(n); |
397 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
398 | break; | |
399 | } | |
400 | } | |
401 | read_unlock_bh(&tbl->lock); | |
402 | return n; | |
403 | } | |
0a204500 | 404 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 LT |
405 | |
406 | struct neighbour *neigh_create(struct neigh_table *tbl, const void *pkey, | |
407 | struct net_device *dev) | |
408 | { | |
409 | u32 hash_val; | |
410 | int key_len = tbl->key_len; | |
411 | int error; | |
412 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl); | |
413 | ||
414 | if (!n) { | |
415 | rc = ERR_PTR(-ENOBUFS); | |
416 | goto out; | |
417 | } | |
418 | ||
419 | memcpy(n->primary_key, pkey, key_len); | |
420 | n->dev = dev; | |
421 | dev_hold(dev); | |
422 | ||
423 | /* Protocol specific setup. */ | |
424 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
425 | rc = ERR_PTR(error); | |
426 | goto out_neigh_release; | |
427 | } | |
428 | ||
429 | /* Device specific setup. */ | |
430 | if (n->parms->neigh_setup && | |
431 | (error = n->parms->neigh_setup(n)) < 0) { | |
432 | rc = ERR_PTR(error); | |
433 | goto out_neigh_release; | |
434 | } | |
435 | ||
436 | n->confirmed = jiffies - (n->parms->base_reachable_time << 1); | |
437 | ||
438 | write_lock_bh(&tbl->lock); | |
439 | ||
440 | if (atomic_read(&tbl->entries) > (tbl->hash_mask + 1)) | |
441 | neigh_hash_grow(tbl, (tbl->hash_mask + 1) << 1); | |
442 | ||
443 | hash_val = tbl->hash(pkey, dev) & tbl->hash_mask; | |
444 | ||
445 | if (n->parms->dead) { | |
446 | rc = ERR_PTR(-EINVAL); | |
447 | goto out_tbl_unlock; | |
448 | } | |
449 | ||
450 | for (n1 = tbl->hash_buckets[hash_val]; n1; n1 = n1->next) { | |
451 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { | |
452 | neigh_hold(n1); | |
453 | rc = n1; | |
454 | goto out_tbl_unlock; | |
455 | } | |
456 | } | |
457 | ||
458 | n->next = tbl->hash_buckets[hash_val]; | |
459 | tbl->hash_buckets[hash_val] = n; | |
460 | n->dead = 0; | |
461 | neigh_hold(n); | |
462 | write_unlock_bh(&tbl->lock); | |
463 | NEIGH_PRINTK2("neigh %p is created.\n", n); | |
464 | rc = n; | |
465 | out: | |
466 | return rc; | |
467 | out_tbl_unlock: | |
468 | write_unlock_bh(&tbl->lock); | |
469 | out_neigh_release: | |
470 | neigh_release(n); | |
471 | goto out; | |
472 | } | |
0a204500 | 473 | EXPORT_SYMBOL(neigh_create); |
1da177e4 | 474 | |
be01d655 | 475 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 476 | { |
fa86d322 | 477 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
478 | hash_val ^= (hash_val >> 16); |
479 | hash_val ^= hash_val >> 8; | |
480 | hash_val ^= hash_val >> 4; | |
481 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
482 | return hash_val; |
483 | } | |
fa86d322 | 484 | |
be01d655 YH |
485 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
486 | struct net *net, | |
487 | const void *pkey, | |
488 | int key_len, | |
489 | struct net_device *dev) | |
490 | { | |
491 | while (n) { | |
fa86d322 | 492 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 493 | net_eq(pneigh_net(n), net) && |
fa86d322 | 494 | (n->dev == dev || !n->dev)) |
be01d655 YH |
495 | return n; |
496 | n = n->next; | |
fa86d322 | 497 | } |
be01d655 YH |
498 | return NULL; |
499 | } | |
fa86d322 | 500 | |
be01d655 YH |
501 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
502 | struct net *net, const void *pkey, struct net_device *dev) | |
503 | { | |
504 | int key_len = tbl->key_len; | |
505 | u32 hash_val = pneigh_hash(pkey, key_len); | |
506 | ||
507 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
508 | net, pkey, key_len, dev); | |
fa86d322 | 509 | } |
0a204500 | 510 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 511 | |
426b5303 EB |
512 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
513 | struct net *net, const void *pkey, | |
1da177e4 LT |
514 | struct net_device *dev, int creat) |
515 | { | |
516 | struct pneigh_entry *n; | |
517 | int key_len = tbl->key_len; | |
be01d655 | 518 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
519 | |
520 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
521 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
522 | net, pkey, key_len, dev); | |
1da177e4 | 523 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
524 | |
525 | if (n || !creat) | |
1da177e4 LT |
526 | goto out; |
527 | ||
4ae28944 PE |
528 | ASSERT_RTNL(); |
529 | ||
1da177e4 LT |
530 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
531 | if (!n) | |
532 | goto out; | |
533 | ||
e42ea986 | 534 | write_pnet(&n->net, hold_net(net)); |
1da177e4 LT |
535 | memcpy(n->key, pkey, key_len); |
536 | n->dev = dev; | |
537 | if (dev) | |
538 | dev_hold(dev); | |
539 | ||
540 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
541 | if (dev) | |
542 | dev_put(dev); | |
da12f735 | 543 | release_net(net); |
1da177e4 LT |
544 | kfree(n); |
545 | n = NULL; | |
546 | goto out; | |
547 | } | |
548 | ||
549 | write_lock_bh(&tbl->lock); | |
550 | n->next = tbl->phash_buckets[hash_val]; | |
551 | tbl->phash_buckets[hash_val] = n; | |
552 | write_unlock_bh(&tbl->lock); | |
553 | out: | |
554 | return n; | |
555 | } | |
0a204500 | 556 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
557 | |
558 | ||
426b5303 | 559 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
560 | struct net_device *dev) |
561 | { | |
562 | struct pneigh_entry *n, **np; | |
563 | int key_len = tbl->key_len; | |
be01d655 | 564 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
565 | |
566 | write_lock_bh(&tbl->lock); | |
567 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
568 | np = &n->next) { | |
426b5303 | 569 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 570 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
571 | *np = n->next; |
572 | write_unlock_bh(&tbl->lock); | |
573 | if (tbl->pdestructor) | |
574 | tbl->pdestructor(n); | |
575 | if (n->dev) | |
576 | dev_put(n->dev); | |
57da52c1 | 577 | release_net(pneigh_net(n)); |
1da177e4 LT |
578 | kfree(n); |
579 | return 0; | |
580 | } | |
581 | } | |
582 | write_unlock_bh(&tbl->lock); | |
583 | return -ENOENT; | |
584 | } | |
585 | ||
586 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
587 | { | |
588 | struct pneigh_entry *n, **np; | |
589 | u32 h; | |
590 | ||
591 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
592 | np = &tbl->phash_buckets[h]; | |
593 | while ((n = *np) != NULL) { | |
594 | if (!dev || n->dev == dev) { | |
595 | *np = n->next; | |
596 | if (tbl->pdestructor) | |
597 | tbl->pdestructor(n); | |
598 | if (n->dev) | |
599 | dev_put(n->dev); | |
57da52c1 | 600 | release_net(pneigh_net(n)); |
1da177e4 LT |
601 | kfree(n); |
602 | continue; | |
603 | } | |
604 | np = &n->next; | |
605 | } | |
606 | } | |
607 | return -ENOENT; | |
608 | } | |
609 | ||
06f0511d DL |
610 | static void neigh_parms_destroy(struct neigh_parms *parms); |
611 | ||
612 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
613 | { | |
614 | if (atomic_dec_and_test(&parms->refcnt)) | |
615 | neigh_parms_destroy(parms); | |
616 | } | |
1da177e4 LT |
617 | |
618 | /* | |
619 | * neighbour must already be out of the table; | |
620 | * | |
621 | */ | |
622 | void neigh_destroy(struct neighbour *neigh) | |
623 | { | |
624 | struct hh_cache *hh; | |
625 | ||
626 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); | |
627 | ||
628 | if (!neigh->dead) { | |
629 | printk(KERN_WARNING | |
630 | "Destroying alive neighbour %p\n", neigh); | |
631 | dump_stack(); | |
632 | return; | |
633 | } | |
634 | ||
635 | if (neigh_del_timer(neigh)) | |
636 | printk(KERN_WARNING "Impossible event.\n"); | |
637 | ||
638 | while ((hh = neigh->hh) != NULL) { | |
639 | neigh->hh = hh->hh_next; | |
640 | hh->hh_next = NULL; | |
3644f0ce SH |
641 | |
642 | write_seqlock_bh(&hh->hh_lock); | |
1da177e4 | 643 | hh->hh_output = neigh_blackhole; |
3644f0ce | 644 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
645 | if (atomic_dec_and_test(&hh->hh_refcnt)) |
646 | kfree(hh); | |
647 | } | |
648 | ||
1da177e4 LT |
649 | skb_queue_purge(&neigh->arp_queue); |
650 | ||
651 | dev_put(neigh->dev); | |
652 | neigh_parms_put(neigh->parms); | |
653 | ||
654 | NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh); | |
655 | ||
656 | atomic_dec(&neigh->tbl->entries); | |
657 | kmem_cache_free(neigh->tbl->kmem_cachep, neigh); | |
658 | } | |
0a204500 | 659 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
660 | |
661 | /* Neighbour state is suspicious; | |
662 | disable fast path. | |
663 | ||
664 | Called with write_locked neigh. | |
665 | */ | |
666 | static void neigh_suspect(struct neighbour *neigh) | |
667 | { | |
668 | struct hh_cache *hh; | |
669 | ||
670 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
671 | ||
672 | neigh->output = neigh->ops->output; | |
673 | ||
674 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
675 | hh->hh_output = neigh->ops->output; | |
676 | } | |
677 | ||
678 | /* Neighbour state is OK; | |
679 | enable fast path. | |
680 | ||
681 | Called with write_locked neigh. | |
682 | */ | |
683 | static void neigh_connect(struct neighbour *neigh) | |
684 | { | |
685 | struct hh_cache *hh; | |
686 | ||
687 | NEIGH_PRINTK2("neigh %p is connected.\n", neigh); | |
688 | ||
689 | neigh->output = neigh->ops->connected_output; | |
690 | ||
691 | for (hh = neigh->hh; hh; hh = hh->hh_next) | |
692 | hh->hh_output = neigh->ops->hh_output; | |
693 | } | |
694 | ||
695 | static void neigh_periodic_timer(unsigned long arg) | |
696 | { | |
697 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
698 | struct neighbour *n, **np; | |
699 | unsigned long expire, now = jiffies; | |
700 | ||
701 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
702 | ||
703 | write_lock(&tbl->lock); | |
704 | ||
705 | /* | |
706 | * periodically recompute ReachableTime from random function | |
707 | */ | |
708 | ||
709 | if (time_after(now, tbl->last_rand + 300 * HZ)) { | |
710 | struct neigh_parms *p; | |
711 | tbl->last_rand = now; | |
712 | for (p = &tbl->parms; p; p = p->next) | |
713 | p->reachable_time = | |
714 | neigh_rand_reach_time(p->base_reachable_time); | |
715 | } | |
716 | ||
717 | np = &tbl->hash_buckets[tbl->hash_chain_gc]; | |
718 | tbl->hash_chain_gc = ((tbl->hash_chain_gc + 1) & tbl->hash_mask); | |
719 | ||
720 | while ((n = *np) != NULL) { | |
721 | unsigned int state; | |
722 | ||
723 | write_lock(&n->lock); | |
724 | ||
725 | state = n->nud_state; | |
726 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
727 | write_unlock(&n->lock); | |
728 | goto next_elt; | |
729 | } | |
730 | ||
731 | if (time_before(n->used, n->confirmed)) | |
732 | n->used = n->confirmed; | |
733 | ||
734 | if (atomic_read(&n->refcnt) == 1 && | |
735 | (state == NUD_FAILED || | |
736 | time_after(now, n->used + n->parms->gc_staletime))) { | |
737 | *np = n->next; | |
738 | n->dead = 1; | |
739 | write_unlock(&n->lock); | |
4f494554 | 740 | neigh_cleanup_and_release(n); |
1da177e4 LT |
741 | continue; |
742 | } | |
743 | write_unlock(&n->lock); | |
744 | ||
745 | next_elt: | |
746 | np = &n->next; | |
747 | } | |
748 | ||
4ec93edb YH |
749 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
750 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 | |
751 | * base_reachable_time. | |
1da177e4 LT |
752 | */ |
753 | expire = tbl->parms.base_reachable_time >> 1; | |
754 | expire /= (tbl->hash_mask + 1); | |
755 | if (!expire) | |
756 | expire = 1; | |
757 | ||
f5a6e01c AV |
758 | if (expire>HZ) |
759 | mod_timer(&tbl->gc_timer, round_jiffies(now + expire)); | |
760 | else | |
761 | mod_timer(&tbl->gc_timer, now + expire); | |
1da177e4 LT |
762 | |
763 | write_unlock(&tbl->lock); | |
764 | } | |
765 | ||
766 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
767 | { | |
768 | struct neigh_parms *p = n->parms; | |
769 | return (n->nud_state & NUD_PROBE ? | |
770 | p->ucast_probes : | |
771 | p->ucast_probes + p->app_probes + p->mcast_probes); | |
772 | } | |
773 | ||
1da177e4 LT |
774 | /* Called when a timer expires for a neighbour entry. */ |
775 | ||
776 | static void neigh_timer_handler(unsigned long arg) | |
777 | { | |
778 | unsigned long now, next; | |
779 | struct neighbour *neigh = (struct neighbour *)arg; | |
780 | unsigned state; | |
781 | int notify = 0; | |
782 | ||
783 | write_lock(&neigh->lock); | |
784 | ||
785 | state = neigh->nud_state; | |
786 | now = jiffies; | |
787 | next = now + HZ; | |
788 | ||
789 | if (!(state & NUD_IN_TIMER)) { | |
790 | #ifndef CONFIG_SMP | |
791 | printk(KERN_WARNING "neigh: timer & !nud_in_timer\n"); | |
792 | #endif | |
793 | goto out; | |
794 | } | |
795 | ||
796 | if (state & NUD_REACHABLE) { | |
4ec93edb | 797 | if (time_before_eq(now, |
1da177e4 LT |
798 | neigh->confirmed + neigh->parms->reachable_time)) { |
799 | NEIGH_PRINTK2("neigh %p is still alive.\n", neigh); | |
800 | next = neigh->confirmed + neigh->parms->reachable_time; | |
801 | } else if (time_before_eq(now, | |
802 | neigh->used + neigh->parms->delay_probe_time)) { | |
803 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
804 | neigh->nud_state = NUD_DELAY; | |
955aaa2f | 805 | neigh->updated = jiffies; |
1da177e4 LT |
806 | neigh_suspect(neigh); |
807 | next = now + neigh->parms->delay_probe_time; | |
808 | } else { | |
809 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
810 | neigh->nud_state = NUD_STALE; | |
955aaa2f | 811 | neigh->updated = jiffies; |
1da177e4 | 812 | neigh_suspect(neigh); |
8d71740c | 813 | notify = 1; |
1da177e4 LT |
814 | } |
815 | } else if (state & NUD_DELAY) { | |
4ec93edb | 816 | if (time_before_eq(now, |
1da177e4 LT |
817 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
818 | NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh); | |
819 | neigh->nud_state = NUD_REACHABLE; | |
955aaa2f | 820 | neigh->updated = jiffies; |
1da177e4 | 821 | neigh_connect(neigh); |
8d71740c | 822 | notify = 1; |
1da177e4 LT |
823 | next = neigh->confirmed + neigh->parms->reachable_time; |
824 | } else { | |
825 | NEIGH_PRINTK2("neigh %p is probed.\n", neigh); | |
826 | neigh->nud_state = NUD_PROBE; | |
955aaa2f | 827 | neigh->updated = jiffies; |
1da177e4 LT |
828 | atomic_set(&neigh->probes, 0); |
829 | next = now + neigh->parms->retrans_time; | |
830 | } | |
831 | } else { | |
832 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
833 | next = now + neigh->parms->retrans_time; | |
834 | } | |
835 | ||
836 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
837 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
838 | struct sk_buff *skb; | |
839 | ||
840 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 841 | neigh->updated = jiffies; |
1da177e4 LT |
842 | notify = 1; |
843 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
844 | NEIGH_PRINTK2("neigh %p is failed.\n", neigh); | |
845 | ||
846 | /* It is very thin place. report_unreachable is very complicated | |
847 | routine. Particularly, it can hit the same neighbour entry! | |
848 | ||
849 | So that, we try to be accurate and avoid dead loop. --ANK | |
850 | */ | |
851 | while (neigh->nud_state == NUD_FAILED && | |
852 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
853 | write_unlock(&neigh->lock); | |
854 | neigh->ops->error_report(neigh, skb); | |
855 | write_lock(&neigh->lock); | |
856 | } | |
857 | skb_queue_purge(&neigh->arp_queue); | |
858 | } | |
859 | ||
860 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
861 | if (time_before(next, jiffies + HZ/2)) |
862 | next = jiffies + HZ/2; | |
6fb9974f HX |
863 | if (!mod_timer(&neigh->timer, next)) |
864 | neigh_hold(neigh); | |
1da177e4 LT |
865 | } |
866 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
867 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); | |
9ff56607 DM |
868 | /* keep skb alive even if arp_queue overflows */ |
869 | if (skb) | |
7e36763b | 870 | skb = skb_copy(skb, GFP_ATOMIC); |
9ff56607 | 871 | write_unlock(&neigh->lock); |
1da177e4 LT |
872 | neigh->ops->solicit(neigh, skb); |
873 | atomic_inc(&neigh->probes); | |
f3fbbe0f | 874 | kfree_skb(skb); |
9ff56607 | 875 | } else { |
69cc64d8 | 876 | out: |
9ff56607 DM |
877 | write_unlock(&neigh->lock); |
878 | } | |
d961db35 | 879 | |
8d71740c | 880 | if (notify) |
d961db35 | 881 | neigh_update_notify(neigh); |
1da177e4 | 882 | |
1da177e4 LT |
883 | neigh_release(neigh); |
884 | } | |
885 | ||
886 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
887 | { | |
888 | int rc; | |
889 | unsigned long now; | |
890 | ||
891 | write_lock_bh(&neigh->lock); | |
892 | ||
893 | rc = 0; | |
894 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
895 | goto out_unlock_bh; | |
896 | ||
897 | now = jiffies; | |
4ec93edb | 898 | |
1da177e4 LT |
899 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
900 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { | |
901 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); | |
902 | neigh->nud_state = NUD_INCOMPLETE; | |
955aaa2f | 903 | neigh->updated = jiffies; |
667347f1 | 904 | neigh_add_timer(neigh, now + 1); |
1da177e4 LT |
905 | } else { |
906 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 907 | neigh->updated = jiffies; |
1da177e4 LT |
908 | write_unlock_bh(&neigh->lock); |
909 | ||
f3fbbe0f | 910 | kfree_skb(skb); |
1da177e4 LT |
911 | return 1; |
912 | } | |
913 | } else if (neigh->nud_state & NUD_STALE) { | |
914 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
1da177e4 | 915 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 916 | neigh->updated = jiffies; |
667347f1 DM |
917 | neigh_add_timer(neigh, |
918 | jiffies + neigh->parms->delay_probe_time); | |
1da177e4 LT |
919 | } |
920 | ||
921 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
922 | if (skb) { | |
923 | if (skb_queue_len(&neigh->arp_queue) >= | |
924 | neigh->parms->queue_len) { | |
925 | struct sk_buff *buff; | |
f72051b0 | 926 | buff = __skb_dequeue(&neigh->arp_queue); |
1da177e4 | 927 | kfree_skb(buff); |
9a6d276e | 928 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 LT |
929 | } |
930 | __skb_queue_tail(&neigh->arp_queue, skb); | |
931 | } | |
932 | rc = 1; | |
933 | } | |
934 | out_unlock_bh: | |
935 | write_unlock_bh(&neigh->lock); | |
936 | return rc; | |
937 | } | |
0a204500 | 938 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 939 | |
e92b43a3 | 940 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
941 | { |
942 | struct hh_cache *hh; | |
3b04ddde SH |
943 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
944 | = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
945 | |
946 | if (update) { | |
947 | for (hh = neigh->hh; hh; hh = hh->hh_next) { | |
3644f0ce | 948 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 949 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 950 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
951 | } |
952 | } | |
953 | } | |
954 | ||
955 | ||
956 | ||
957 | /* Generic update routine. | |
958 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
959 | -- new is new state. | |
960 | -- flags | |
961 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
962 | if it is different. | |
963 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 964 | lladdr instead of overriding it |
1da177e4 LT |
965 | if it is different. |
966 | It also allows to retain current state | |
967 | if lladdr is unchanged. | |
968 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
969 | ||
4ec93edb | 970 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
971 | NTF_ROUTER flag. |
972 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
973 | a router. | |
974 | ||
975 | Caller MUST hold reference count on the entry. | |
976 | */ | |
977 | ||
978 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
979 | u32 flags) | |
980 | { | |
981 | u8 old; | |
982 | int err; | |
1da177e4 | 983 | int notify = 0; |
1da177e4 LT |
984 | struct net_device *dev; |
985 | int update_isrouter = 0; | |
986 | ||
987 | write_lock_bh(&neigh->lock); | |
988 | ||
989 | dev = neigh->dev; | |
990 | old = neigh->nud_state; | |
991 | err = -EPERM; | |
992 | ||
4ec93edb | 993 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
994 | (old & (NUD_NOARP | NUD_PERMANENT))) |
995 | goto out; | |
996 | ||
997 | if (!(new & NUD_VALID)) { | |
998 | neigh_del_timer(neigh); | |
999 | if (old & NUD_CONNECTED) | |
1000 | neigh_suspect(neigh); | |
1001 | neigh->nud_state = new; | |
1002 | err = 0; | |
1da177e4 | 1003 | notify = old & NUD_VALID; |
1da177e4 LT |
1004 | goto out; |
1005 | } | |
1006 | ||
1007 | /* Compare new lladdr with cached one */ | |
1008 | if (!dev->addr_len) { | |
1009 | /* First case: device needs no address. */ | |
1010 | lladdr = neigh->ha; | |
1011 | } else if (lladdr) { | |
1012 | /* The second case: if something is already cached | |
1013 | and a new address is proposed: | |
1014 | - compare new & old | |
1015 | - if they are different, check override flag | |
1016 | */ | |
4ec93edb | 1017 | if ((old & NUD_VALID) && |
1da177e4 LT |
1018 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1019 | lladdr = neigh->ha; | |
1020 | } else { | |
1021 | /* No address is supplied; if we know something, | |
1022 | use it, otherwise discard the request. | |
1023 | */ | |
1024 | err = -EINVAL; | |
1025 | if (!(old & NUD_VALID)) | |
1026 | goto out; | |
1027 | lladdr = neigh->ha; | |
1028 | } | |
1029 | ||
1030 | if (new & NUD_CONNECTED) | |
1031 | neigh->confirmed = jiffies; | |
1032 | neigh->updated = jiffies; | |
1033 | ||
1034 | /* If entry was valid and address is not changed, | |
1035 | do not change entry state, if new one is STALE. | |
1036 | */ | |
1037 | err = 0; | |
1038 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1039 | if (old & NUD_VALID) { | |
1040 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1041 | update_isrouter = 0; | |
1042 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1043 | (old & NUD_CONNECTED)) { | |
1044 | lladdr = neigh->ha; | |
1045 | new = NUD_STALE; | |
1046 | } else | |
1047 | goto out; | |
1048 | } else { | |
1049 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1050 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1051 | (old & NUD_CONNECTED)) | |
1052 | ) | |
1053 | new = old; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | if (new != old) { | |
1058 | neigh_del_timer(neigh); | |
a43d8994 | 1059 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1060 | neigh_add_timer(neigh, (jiffies + |
1061 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1062 | neigh->parms->reachable_time : |
1063 | 0))); | |
1da177e4 LT |
1064 | neigh->nud_state = new; |
1065 | } | |
1066 | ||
1067 | if (lladdr != neigh->ha) { | |
1068 | memcpy(&neigh->ha, lladdr, dev->addr_len); | |
1069 | neigh_update_hhs(neigh); | |
1070 | if (!(new & NUD_CONNECTED)) | |
1071 | neigh->confirmed = jiffies - | |
1072 | (neigh->parms->base_reachable_time << 1); | |
1da177e4 | 1073 | notify = 1; |
1da177e4 LT |
1074 | } |
1075 | if (new == old) | |
1076 | goto out; | |
1077 | if (new & NUD_CONNECTED) | |
1078 | neigh_connect(neigh); | |
1079 | else | |
1080 | neigh_suspect(neigh); | |
1081 | if (!(old & NUD_VALID)) { | |
1082 | struct sk_buff *skb; | |
1083 | ||
1084 | /* Again: avoid dead loop if something went wrong */ | |
1085 | ||
1086 | while (neigh->nud_state & NUD_VALID && | |
1087 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
1088 | struct neighbour *n1 = neigh; | |
1089 | write_unlock_bh(&neigh->lock); | |
1090 | /* On shaper/eql skb->dst->neighbour != neigh :( */ | |
adf30907 ED |
1091 | if (skb_dst(skb) && skb_dst(skb)->neighbour) |
1092 | n1 = skb_dst(skb)->neighbour; | |
1da177e4 LT |
1093 | n1->output(skb); |
1094 | write_lock_bh(&neigh->lock); | |
1095 | } | |
1096 | skb_queue_purge(&neigh->arp_queue); | |
1097 | } | |
1098 | out: | |
1099 | if (update_isrouter) { | |
1100 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1101 | (neigh->flags | NTF_ROUTER) : | |
1102 | (neigh->flags & ~NTF_ROUTER); | |
1103 | } | |
1104 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1105 | |
1106 | if (notify) | |
d961db35 TG |
1107 | neigh_update_notify(neigh); |
1108 | ||
1da177e4 LT |
1109 | return err; |
1110 | } | |
0a204500 | 1111 | EXPORT_SYMBOL(neigh_update); |
1da177e4 LT |
1112 | |
1113 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1114 | u8 *lladdr, void *saddr, | |
1115 | struct net_device *dev) | |
1116 | { | |
1117 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1118 | lladdr || !dev->addr_len); | |
1119 | if (neigh) | |
4ec93edb | 1120 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1121 | NEIGH_UPDATE_F_OVERRIDE); |
1122 | return neigh; | |
1123 | } | |
0a204500 | 1124 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 LT |
1125 | |
1126 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst, | |
d77072ec | 1127 | __be16 protocol) |
1da177e4 LT |
1128 | { |
1129 | struct hh_cache *hh; | |
1130 | struct net_device *dev = dst->dev; | |
1131 | ||
1132 | for (hh = n->hh; hh; hh = hh->hh_next) | |
1133 | if (hh->hh_type == protocol) | |
1134 | break; | |
1135 | ||
77d04bd9 | 1136 | if (!hh && (hh = kzalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) { |
3644f0ce | 1137 | seqlock_init(&hh->hh_lock); |
1da177e4 LT |
1138 | hh->hh_type = protocol; |
1139 | atomic_set(&hh->hh_refcnt, 0); | |
1140 | hh->hh_next = NULL; | |
3b04ddde SH |
1141 | |
1142 | if (dev->header_ops->cache(n, hh)) { | |
1da177e4 LT |
1143 | kfree(hh); |
1144 | hh = NULL; | |
1145 | } else { | |
1146 | atomic_inc(&hh->hh_refcnt); | |
1147 | hh->hh_next = n->hh; | |
1148 | n->hh = hh; | |
1149 | if (n->nud_state & NUD_CONNECTED) | |
1150 | hh->hh_output = n->ops->hh_output; | |
1151 | else | |
1152 | hh->hh_output = n->ops->output; | |
1153 | } | |
1154 | } | |
1155 | if (hh) { | |
1156 | atomic_inc(&hh->hh_refcnt); | |
1157 | dst->hh = hh; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* This function can be used in contexts, where only old dev_queue_xmit | |
1162 | worked, f.e. if you want to override normal output path (eql, shaper), | |
1163 | but resolution is not made yet. | |
1164 | */ | |
1165 | ||
1166 | int neigh_compat_output(struct sk_buff *skb) | |
1167 | { | |
1168 | struct net_device *dev = skb->dev; | |
1169 | ||
bbe735e4 | 1170 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1171 | |
0c4e8581 SH |
1172 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
1173 | skb->len) < 0 && | |
3b04ddde | 1174 | dev->header_ops->rebuild(skb)) |
1da177e4 LT |
1175 | return 0; |
1176 | ||
1177 | return dev_queue_xmit(skb); | |
1178 | } | |
0a204500 | 1179 | EXPORT_SYMBOL(neigh_compat_output); |
1da177e4 LT |
1180 | |
1181 | /* Slow and careful. */ | |
1182 | ||
1183 | int neigh_resolve_output(struct sk_buff *skb) | |
1184 | { | |
adf30907 | 1185 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
1186 | struct neighbour *neigh; |
1187 | int rc = 0; | |
1188 | ||
1189 | if (!dst || !(neigh = dst->neighbour)) | |
1190 | goto discard; | |
1191 | ||
bbe735e4 | 1192 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1193 | |
1194 | if (!neigh_event_send(neigh, skb)) { | |
1195 | int err; | |
1196 | struct net_device *dev = neigh->dev; | |
3b04ddde | 1197 | if (dev->header_ops->cache && !dst->hh) { |
1da177e4 LT |
1198 | write_lock_bh(&neigh->lock); |
1199 | if (!dst->hh) | |
1200 | neigh_hh_init(neigh, dst, dst->ops->protocol); | |
0c4e8581 SH |
1201 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1202 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1203 | write_unlock_bh(&neigh->lock); |
1204 | } else { | |
1205 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1206 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1207 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1208 | read_unlock_bh(&neigh->lock); |
1209 | } | |
1210 | if (err >= 0) | |
1211 | rc = neigh->ops->queue_xmit(skb); | |
1212 | else | |
1213 | goto out_kfree_skb; | |
1214 | } | |
1215 | out: | |
1216 | return rc; | |
1217 | discard: | |
1218 | NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n", | |
1219 | dst, dst ? dst->neighbour : NULL); | |
1220 | out_kfree_skb: | |
1221 | rc = -EINVAL; | |
1222 | kfree_skb(skb); | |
1223 | goto out; | |
1224 | } | |
0a204500 | 1225 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1226 | |
1227 | /* As fast as possible without hh cache */ | |
1228 | ||
1229 | int neigh_connected_output(struct sk_buff *skb) | |
1230 | { | |
1231 | int err; | |
adf30907 | 1232 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
1233 | struct neighbour *neigh = dst->neighbour; |
1234 | struct net_device *dev = neigh->dev; | |
1235 | ||
bbe735e4 | 1236 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1237 | |
1238 | read_lock_bh(&neigh->lock); | |
0c4e8581 SH |
1239 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
1240 | neigh->ha, NULL, skb->len); | |
1da177e4 LT |
1241 | read_unlock_bh(&neigh->lock); |
1242 | if (err >= 0) | |
1243 | err = neigh->ops->queue_xmit(skb); | |
1244 | else { | |
1245 | err = -EINVAL; | |
1246 | kfree_skb(skb); | |
1247 | } | |
1248 | return err; | |
1249 | } | |
0a204500 | 1250 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 LT |
1251 | |
1252 | static void neigh_proxy_process(unsigned long arg) | |
1253 | { | |
1254 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1255 | long sched_next = 0; | |
1256 | unsigned long now = jiffies; | |
f72051b0 | 1257 | struct sk_buff *skb, *n; |
1da177e4 LT |
1258 | |
1259 | spin_lock(&tbl->proxy_queue.lock); | |
1260 | ||
f72051b0 DM |
1261 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1262 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1263 | |
1da177e4 | 1264 | if (tdif <= 0) { |
f72051b0 DM |
1265 | struct net_device *dev = skb->dev; |
1266 | __skb_unlink(skb, &tbl->proxy_queue); | |
1da177e4 | 1267 | if (tbl->proxy_redo && netif_running(dev)) |
f72051b0 | 1268 | tbl->proxy_redo(skb); |
1da177e4 | 1269 | else |
f72051b0 | 1270 | kfree_skb(skb); |
1da177e4 LT |
1271 | |
1272 | dev_put(dev); | |
1273 | } else if (!sched_next || tdif < sched_next) | |
1274 | sched_next = tdif; | |
1275 | } | |
1276 | del_timer(&tbl->proxy_timer); | |
1277 | if (sched_next) | |
1278 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1279 | spin_unlock(&tbl->proxy_queue.lock); | |
1280 | } | |
1281 | ||
1282 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1283 | struct sk_buff *skb) | |
1284 | { | |
1285 | unsigned long now = jiffies; | |
1286 | unsigned long sched_next = now + (net_random() % p->proxy_delay); | |
1287 | ||
1288 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { | |
1289 | kfree_skb(skb); | |
1290 | return; | |
1291 | } | |
a61bbcf2 PM |
1292 | |
1293 | NEIGH_CB(skb)->sched_next = sched_next; | |
1294 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1295 | |
1296 | spin_lock(&tbl->proxy_queue.lock); | |
1297 | if (del_timer(&tbl->proxy_timer)) { | |
1298 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1299 | sched_next = tbl->proxy_timer.expires; | |
1300 | } | |
adf30907 | 1301 | skb_dst_drop(skb); |
1da177e4 LT |
1302 | dev_hold(skb->dev); |
1303 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1304 | mod_timer(&tbl->proxy_timer, sched_next); | |
1305 | spin_unlock(&tbl->proxy_queue.lock); | |
1306 | } | |
0a204500 | 1307 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1308 | |
426b5303 EB |
1309 | static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl, |
1310 | struct net *net, int ifindex) | |
1311 | { | |
1312 | struct neigh_parms *p; | |
1313 | ||
1314 | for (p = &tbl->parms; p; p = p->next) { | |
878628fb | 1315 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
426b5303 EB |
1316 | (!p->dev && !ifindex)) |
1317 | return p; | |
1318 | } | |
1319 | ||
1320 | return NULL; | |
1321 | } | |
1da177e4 LT |
1322 | |
1323 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1324 | struct neigh_table *tbl) | |
1325 | { | |
426b5303 | 1326 | struct neigh_parms *p, *ref; |
00829823 SH |
1327 | struct net *net = dev_net(dev); |
1328 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1329 | |
426b5303 EB |
1330 | ref = lookup_neigh_params(tbl, net, 0); |
1331 | if (!ref) | |
1332 | return NULL; | |
1da177e4 | 1333 | |
426b5303 | 1334 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1335 | if (p) { |
1da177e4 LT |
1336 | p->tbl = tbl; |
1337 | atomic_set(&p->refcnt, 1); | |
1da177e4 LT |
1338 | p->reachable_time = |
1339 | neigh_rand_reach_time(p->base_reachable_time); | |
c7fb64db | 1340 | |
00829823 | 1341 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
486b51d3 DL |
1342 | kfree(p); |
1343 | return NULL; | |
1da177e4 | 1344 | } |
486b51d3 DL |
1345 | |
1346 | dev_hold(dev); | |
1347 | p->dev = dev; | |
e42ea986 | 1348 | write_pnet(&p->net, hold_net(net)); |
1da177e4 LT |
1349 | p->sysctl_table = NULL; |
1350 | write_lock_bh(&tbl->lock); | |
1351 | p->next = tbl->parms.next; | |
1352 | tbl->parms.next = p; | |
1353 | write_unlock_bh(&tbl->lock); | |
1354 | } | |
1355 | return p; | |
1356 | } | |
0a204500 | 1357 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1358 | |
1359 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1360 | { | |
1361 | struct neigh_parms *parms = | |
1362 | container_of(head, struct neigh_parms, rcu_head); | |
1363 | ||
1364 | neigh_parms_put(parms); | |
1365 | } | |
1366 | ||
1367 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1368 | { | |
1369 | struct neigh_parms **p; | |
1370 | ||
1371 | if (!parms || parms == &tbl->parms) | |
1372 | return; | |
1373 | write_lock_bh(&tbl->lock); | |
1374 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { | |
1375 | if (*p == parms) { | |
1376 | *p = parms->next; | |
1377 | parms->dead = 1; | |
1378 | write_unlock_bh(&tbl->lock); | |
cecbb639 DM |
1379 | if (parms->dev) |
1380 | dev_put(parms->dev); | |
1da177e4 LT |
1381 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1382 | return; | |
1383 | } | |
1384 | } | |
1385 | write_unlock_bh(&tbl->lock); | |
1386 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); | |
1387 | } | |
0a204500 | 1388 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1389 | |
06f0511d | 1390 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1391 | { |
57da52c1 | 1392 | release_net(neigh_parms_net(parms)); |
1da177e4 LT |
1393 | kfree(parms); |
1394 | } | |
1395 | ||
c2ecba71 PE |
1396 | static struct lock_class_key neigh_table_proxy_queue_class; |
1397 | ||
bd89efc5 | 1398 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
1da177e4 LT |
1399 | { |
1400 | unsigned long now = jiffies; | |
1401 | unsigned long phsize; | |
1402 | ||
e42ea986 | 1403 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1404 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 LT |
1405 | tbl->parms.reachable_time = |
1406 | neigh_rand_reach_time(tbl->parms.base_reachable_time); | |
1407 | ||
1408 | if (!tbl->kmem_cachep) | |
e5d679f3 AD |
1409 | tbl->kmem_cachep = |
1410 | kmem_cache_create(tbl->id, tbl->entry_size, 0, | |
1411 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
20c2df83 | 1412 | NULL); |
1da177e4 LT |
1413 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1414 | if (!tbl->stats) | |
1415 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1416 | |
1da177e4 | 1417 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1418 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1419 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1420 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1421 | #endif |
1422 | ||
1423 | tbl->hash_mask = 1; | |
1424 | tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1); | |
1425 | ||
1426 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1427 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 LT |
1428 | |
1429 | if (!tbl->hash_buckets || !tbl->phash_buckets) | |
1430 | panic("cannot allocate neighbour cache hashes"); | |
1431 | ||
1da177e4 LT |
1432 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
1433 | ||
1434 | rwlock_init(&tbl->lock); | |
b24b8a24 | 1435 | setup_timer(&tbl->gc_timer, neigh_periodic_timer, (unsigned long)tbl); |
1da177e4 LT |
1436 | tbl->gc_timer.expires = now + 1; |
1437 | add_timer(&tbl->gc_timer); | |
1438 | ||
b24b8a24 | 1439 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1440 | skb_queue_head_init_class(&tbl->proxy_queue, |
1441 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1442 | |
1443 | tbl->last_flush = now; | |
1444 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1445 | } |
0a204500 | 1446 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
bd89efc5 SK |
1447 | |
1448 | void neigh_table_init(struct neigh_table *tbl) | |
1449 | { | |
1450 | struct neigh_table *tmp; | |
1451 | ||
1452 | neigh_table_init_no_netlink(tbl); | |
1da177e4 | 1453 | write_lock(&neigh_tbl_lock); |
bd89efc5 SK |
1454 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
1455 | if (tmp->family == tbl->family) | |
1456 | break; | |
1457 | } | |
1da177e4 LT |
1458 | tbl->next = neigh_tables; |
1459 | neigh_tables = tbl; | |
1460 | write_unlock(&neigh_tbl_lock); | |
bd89efc5 SK |
1461 | |
1462 | if (unlikely(tmp)) { | |
1463 | printk(KERN_ERR "NEIGH: Registering multiple tables for " | |
1464 | "family %d\n", tbl->family); | |
1465 | dump_stack(); | |
1466 | } | |
1da177e4 | 1467 | } |
0a204500 | 1468 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 LT |
1469 | |
1470 | int neigh_table_clear(struct neigh_table *tbl) | |
1471 | { | |
1472 | struct neigh_table **tp; | |
1473 | ||
1474 | /* It is not clean... Fix it to unload IPv6 module safely */ | |
1475 | del_timer_sync(&tbl->gc_timer); | |
1476 | del_timer_sync(&tbl->proxy_timer); | |
1477 | pneigh_queue_purge(&tbl->proxy_queue); | |
1478 | neigh_ifdown(tbl, NULL); | |
1479 | if (atomic_read(&tbl->entries)) | |
1480 | printk(KERN_CRIT "neighbour leakage\n"); | |
1481 | write_lock(&neigh_tbl_lock); | |
1482 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { | |
1483 | if (*tp == tbl) { | |
1484 | *tp = tbl->next; | |
1485 | break; | |
1486 | } | |
1487 | } | |
1488 | write_unlock(&neigh_tbl_lock); | |
1489 | ||
1490 | neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1); | |
1491 | tbl->hash_buckets = NULL; | |
1492 | ||
1493 | kfree(tbl->phash_buckets); | |
1494 | tbl->phash_buckets = NULL; | |
1495 | ||
3f192b5c AD |
1496 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1497 | ||
3fcde74b KK |
1498 | free_percpu(tbl->stats); |
1499 | tbl->stats = NULL; | |
1500 | ||
bfb85c9f RD |
1501 | kmem_cache_destroy(tbl->kmem_cachep); |
1502 | tbl->kmem_cachep = NULL; | |
1503 | ||
1da177e4 LT |
1504 | return 0; |
1505 | } | |
0a204500 | 1506 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1507 | |
c8822a4e | 1508 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1509 | { |
3b1e0a65 | 1510 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1511 | struct ndmsg *ndm; |
1512 | struct nlattr *dst_attr; | |
1da177e4 LT |
1513 | struct neigh_table *tbl; |
1514 | struct net_device *dev = NULL; | |
a14a49d2 | 1515 | int err = -EINVAL; |
1da177e4 | 1516 | |
a14a49d2 | 1517 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1518 | goto out; |
1519 | ||
a14a49d2 TG |
1520 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1521 | if (dst_attr == NULL) | |
1522 | goto out; | |
1523 | ||
1524 | ndm = nlmsg_data(nlh); | |
1525 | if (ndm->ndm_ifindex) { | |
881d966b | 1526 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1527 | if (dev == NULL) { |
1528 | err = -ENODEV; | |
1529 | goto out; | |
1530 | } | |
1531 | } | |
1532 | ||
1da177e4 LT |
1533 | read_lock(&neigh_tbl_lock); |
1534 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
a14a49d2 | 1535 | struct neighbour *neigh; |
1da177e4 LT |
1536 | |
1537 | if (tbl->family != ndm->ndm_family) | |
1538 | continue; | |
1539 | read_unlock(&neigh_tbl_lock); | |
1540 | ||
a14a49d2 | 1541 | if (nla_len(dst_attr) < tbl->key_len) |
1da177e4 LT |
1542 | goto out_dev_put; |
1543 | ||
1544 | if (ndm->ndm_flags & NTF_PROXY) { | |
426b5303 | 1545 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
1da177e4 LT |
1546 | goto out_dev_put; |
1547 | } | |
1548 | ||
a14a49d2 TG |
1549 | if (dev == NULL) |
1550 | goto out_dev_put; | |
1da177e4 | 1551 | |
a14a49d2 TG |
1552 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1553 | if (neigh == NULL) { | |
1554 | err = -ENOENT; | |
1555 | goto out_dev_put; | |
1da177e4 | 1556 | } |
a14a49d2 TG |
1557 | |
1558 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1559 | NEIGH_UPDATE_F_OVERRIDE | | |
1560 | NEIGH_UPDATE_F_ADMIN); | |
1561 | neigh_release(neigh); | |
1da177e4 LT |
1562 | goto out_dev_put; |
1563 | } | |
1564 | read_unlock(&neigh_tbl_lock); | |
a14a49d2 TG |
1565 | err = -EAFNOSUPPORT; |
1566 | ||
1da177e4 LT |
1567 | out_dev_put: |
1568 | if (dev) | |
1569 | dev_put(dev); | |
1570 | out: | |
1571 | return err; | |
1572 | } | |
1573 | ||
c8822a4e | 1574 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1575 | { |
3b1e0a65 | 1576 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1577 | struct ndmsg *ndm; |
1578 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1579 | struct neigh_table *tbl; |
1580 | struct net_device *dev = NULL; | |
5208debd | 1581 | int err; |
1da177e4 | 1582 | |
5208debd TG |
1583 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1584 | if (err < 0) | |
1da177e4 LT |
1585 | goto out; |
1586 | ||
5208debd TG |
1587 | err = -EINVAL; |
1588 | if (tb[NDA_DST] == NULL) | |
1589 | goto out; | |
1590 | ||
1591 | ndm = nlmsg_data(nlh); | |
1592 | if (ndm->ndm_ifindex) { | |
881d966b | 1593 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1594 | if (dev == NULL) { |
1595 | err = -ENODEV; | |
1596 | goto out; | |
1597 | } | |
1598 | ||
1599 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
1600 | goto out_dev_put; | |
1601 | } | |
1602 | ||
1da177e4 LT |
1603 | read_lock(&neigh_tbl_lock); |
1604 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
5208debd TG |
1605 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
1606 | struct neighbour *neigh; | |
1607 | void *dst, *lladdr; | |
1da177e4 LT |
1608 | |
1609 | if (tbl->family != ndm->ndm_family) | |
1610 | continue; | |
1611 | read_unlock(&neigh_tbl_lock); | |
1612 | ||
5208debd | 1613 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1da177e4 | 1614 | goto out_dev_put; |
5208debd TG |
1615 | dst = nla_data(tb[NDA_DST]); |
1616 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 LT |
1617 | |
1618 | if (ndm->ndm_flags & NTF_PROXY) { | |
62dd9318 VN |
1619 | struct pneigh_entry *pn; |
1620 | ||
1621 | err = -ENOBUFS; | |
426b5303 | 1622 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
62dd9318 VN |
1623 | if (pn) { |
1624 | pn->flags = ndm->ndm_flags; | |
1625 | err = 0; | |
1626 | } | |
1da177e4 LT |
1627 | goto out_dev_put; |
1628 | } | |
1629 | ||
5208debd | 1630 | if (dev == NULL) |
1da177e4 | 1631 | goto out_dev_put; |
5208debd TG |
1632 | |
1633 | neigh = neigh_lookup(tbl, dst, dev); | |
1634 | if (neigh == NULL) { | |
1635 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1636 | err = -ENOENT; | |
1637 | goto out_dev_put; | |
1638 | } | |
4ec93edb | 1639 | |
5208debd TG |
1640 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1641 | if (IS_ERR(neigh)) { | |
1642 | err = PTR_ERR(neigh); | |
1da177e4 LT |
1643 | goto out_dev_put; |
1644 | } | |
1da177e4 | 1645 | } else { |
5208debd TG |
1646 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1647 | err = -EEXIST; | |
1648 | neigh_release(neigh); | |
1da177e4 LT |
1649 | goto out_dev_put; |
1650 | } | |
1da177e4 | 1651 | |
5208debd TG |
1652 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1653 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1654 | } | |
1da177e4 | 1655 | |
0c5c2d30 EB |
1656 | if (ndm->ndm_flags & NTF_USE) { |
1657 | neigh_event_send(neigh, NULL); | |
1658 | err = 0; | |
1659 | } else | |
1660 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
5208debd | 1661 | neigh_release(neigh); |
1da177e4 LT |
1662 | goto out_dev_put; |
1663 | } | |
1664 | ||
1665 | read_unlock(&neigh_tbl_lock); | |
5208debd TG |
1666 | err = -EAFNOSUPPORT; |
1667 | ||
1da177e4 LT |
1668 | out_dev_put: |
1669 | if (dev) | |
1670 | dev_put(dev); | |
1671 | out: | |
1672 | return err; | |
1673 | } | |
1674 | ||
c7fb64db TG |
1675 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1676 | { | |
ca860fb3 TG |
1677 | struct nlattr *nest; |
1678 | ||
1679 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1680 | if (nest == NULL) | |
1681 | return -ENOBUFS; | |
c7fb64db TG |
1682 | |
1683 | if (parms->dev) | |
ca860fb3 TG |
1684 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
1685 | ||
1686 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); | |
1687 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); | |
1688 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); | |
1689 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); | |
1690 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); | |
1691 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); | |
1692 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); | |
1693 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, | |
c7fb64db | 1694 | parms->base_reachable_time); |
ca860fb3 TG |
1695 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
1696 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); | |
1697 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); | |
1698 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); | |
1699 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); | |
1700 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); | |
c7fb64db | 1701 | |
ca860fb3 | 1702 | return nla_nest_end(skb, nest); |
c7fb64db | 1703 | |
ca860fb3 | 1704 | nla_put_failure: |
bc3ed28c TG |
1705 | nla_nest_cancel(skb, nest); |
1706 | return -EMSGSIZE; | |
c7fb64db TG |
1707 | } |
1708 | ||
ca860fb3 TG |
1709 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1710 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1711 | { |
1712 | struct nlmsghdr *nlh; | |
1713 | struct ndtmsg *ndtmsg; | |
1714 | ||
ca860fb3 TG |
1715 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1716 | if (nlh == NULL) | |
26932566 | 1717 | return -EMSGSIZE; |
c7fb64db | 1718 | |
ca860fb3 | 1719 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1720 | |
1721 | read_lock_bh(&tbl->lock); | |
1722 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1723 | ndtmsg->ndtm_pad1 = 0; |
1724 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1725 | |
ca860fb3 TG |
1726 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
1727 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); | |
1728 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); | |
1729 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); | |
1730 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); | |
c7fb64db TG |
1731 | |
1732 | { | |
1733 | unsigned long now = jiffies; | |
1734 | unsigned int flush_delta = now - tbl->last_flush; | |
1735 | unsigned int rand_delta = now - tbl->last_rand; | |
1736 | ||
1737 | struct ndt_config ndc = { | |
1738 | .ndtc_key_len = tbl->key_len, | |
1739 | .ndtc_entry_size = tbl->entry_size, | |
1740 | .ndtc_entries = atomic_read(&tbl->entries), | |
1741 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1742 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
1743 | .ndtc_hash_rnd = tbl->hash_rnd, | |
1744 | .ndtc_hash_mask = tbl->hash_mask, | |
1745 | .ndtc_hash_chain_gc = tbl->hash_chain_gc, | |
1746 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, | |
1747 | }; | |
1748 | ||
ca860fb3 | 1749 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
c7fb64db TG |
1750 | } |
1751 | ||
1752 | { | |
1753 | int cpu; | |
1754 | struct ndt_stats ndst; | |
1755 | ||
1756 | memset(&ndst, 0, sizeof(ndst)); | |
1757 | ||
6f912042 | 1758 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1759 | struct neigh_statistics *st; |
1760 | ||
c7fb64db TG |
1761 | st = per_cpu_ptr(tbl->stats, cpu); |
1762 | ndst.ndts_allocs += st->allocs; | |
1763 | ndst.ndts_destroys += st->destroys; | |
1764 | ndst.ndts_hash_grows += st->hash_grows; | |
1765 | ndst.ndts_res_failed += st->res_failed; | |
1766 | ndst.ndts_lookups += st->lookups; | |
1767 | ndst.ndts_hits += st->hits; | |
1768 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1769 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1770 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1771 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1772 | } | |
1773 | ||
ca860fb3 | 1774 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
c7fb64db TG |
1775 | } |
1776 | ||
1777 | BUG_ON(tbl->parms.dev); | |
1778 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1779 | goto nla_put_failure; |
c7fb64db TG |
1780 | |
1781 | read_unlock_bh(&tbl->lock); | |
ca860fb3 | 1782 | return nlmsg_end(skb, nlh); |
c7fb64db | 1783 | |
ca860fb3 | 1784 | nla_put_failure: |
c7fb64db | 1785 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1786 | nlmsg_cancel(skb, nlh); |
1787 | return -EMSGSIZE; | |
c7fb64db TG |
1788 | } |
1789 | ||
ca860fb3 TG |
1790 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1791 | struct neigh_table *tbl, | |
c7fb64db | 1792 | struct neigh_parms *parms, |
ca860fb3 TG |
1793 | u32 pid, u32 seq, int type, |
1794 | unsigned int flags) | |
c7fb64db TG |
1795 | { |
1796 | struct ndtmsg *ndtmsg; | |
1797 | struct nlmsghdr *nlh; | |
1798 | ||
ca860fb3 TG |
1799 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1800 | if (nlh == NULL) | |
26932566 | 1801 | return -EMSGSIZE; |
c7fb64db | 1802 | |
ca860fb3 | 1803 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1804 | |
1805 | read_lock_bh(&tbl->lock); | |
1806 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1807 | ndtmsg->ndtm_pad1 = 0; |
1808 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1809 | |
ca860fb3 TG |
1810 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1811 | neightbl_fill_parms(skb, parms) < 0) | |
1812 | goto errout; | |
c7fb64db TG |
1813 | |
1814 | read_unlock_bh(&tbl->lock); | |
ca860fb3 TG |
1815 | return nlmsg_end(skb, nlh); |
1816 | errout: | |
c7fb64db | 1817 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1818 | nlmsg_cancel(skb, nlh); |
1819 | return -EMSGSIZE; | |
c7fb64db | 1820 | } |
4ec93edb | 1821 | |
ef7c79ed | 1822 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1823 | [NDTA_NAME] = { .type = NLA_STRING }, |
1824 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1825 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1826 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1827 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1828 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1829 | }; | |
1830 | ||
ef7c79ed | 1831 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1832 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1833 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1834 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1835 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1836 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1837 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
1838 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1839 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1840 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1841 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1842 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1843 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1844 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1845 | }; | |
1846 | ||
c8822a4e | 1847 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
c7fb64db | 1848 | { |
3b1e0a65 | 1849 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1850 | struct neigh_table *tbl; |
6b3f8674 TG |
1851 | struct ndtmsg *ndtmsg; |
1852 | struct nlattr *tb[NDTA_MAX+1]; | |
1853 | int err; | |
c7fb64db | 1854 | |
6b3f8674 TG |
1855 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1856 | nl_neightbl_policy); | |
1857 | if (err < 0) | |
1858 | goto errout; | |
c7fb64db | 1859 | |
6b3f8674 TG |
1860 | if (tb[NDTA_NAME] == NULL) { |
1861 | err = -EINVAL; | |
1862 | goto errout; | |
1863 | } | |
1864 | ||
1865 | ndtmsg = nlmsg_data(nlh); | |
c7fb64db TG |
1866 | read_lock(&neigh_tbl_lock); |
1867 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
1868 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) | |
1869 | continue; | |
1870 | ||
6b3f8674 | 1871 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
c7fb64db TG |
1872 | break; |
1873 | } | |
1874 | ||
1875 | if (tbl == NULL) { | |
1876 | err = -ENOENT; | |
6b3f8674 | 1877 | goto errout_locked; |
c7fb64db TG |
1878 | } |
1879 | ||
4ec93edb | 1880 | /* |
c7fb64db TG |
1881 | * We acquire tbl->lock to be nice to the periodic timers and |
1882 | * make sure they always see a consistent set of values. | |
1883 | */ | |
1884 | write_lock_bh(&tbl->lock); | |
1885 | ||
6b3f8674 TG |
1886 | if (tb[NDTA_PARMS]) { |
1887 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1888 | struct neigh_parms *p; |
6b3f8674 | 1889 | int i, ifindex = 0; |
c7fb64db | 1890 | |
6b3f8674 TG |
1891 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1892 | nl_ntbl_parm_policy); | |
1893 | if (err < 0) | |
1894 | goto errout_tbl_lock; | |
c7fb64db | 1895 | |
6b3f8674 TG |
1896 | if (tbp[NDTPA_IFINDEX]) |
1897 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1898 | |
426b5303 | 1899 | p = lookup_neigh_params(tbl, net, ifindex); |
c7fb64db TG |
1900 | if (p == NULL) { |
1901 | err = -ENOENT; | |
6b3f8674 | 1902 | goto errout_tbl_lock; |
c7fb64db | 1903 | } |
c7fb64db | 1904 | |
6b3f8674 TG |
1905 | for (i = 1; i <= NDTPA_MAX; i++) { |
1906 | if (tbp[i] == NULL) | |
1907 | continue; | |
c7fb64db | 1908 | |
6b3f8674 TG |
1909 | switch (i) { |
1910 | case NDTPA_QUEUE_LEN: | |
1911 | p->queue_len = nla_get_u32(tbp[i]); | |
1912 | break; | |
1913 | case NDTPA_PROXY_QLEN: | |
1914 | p->proxy_qlen = nla_get_u32(tbp[i]); | |
1915 | break; | |
1916 | case NDTPA_APP_PROBES: | |
1917 | p->app_probes = nla_get_u32(tbp[i]); | |
1918 | break; | |
1919 | case NDTPA_UCAST_PROBES: | |
1920 | p->ucast_probes = nla_get_u32(tbp[i]); | |
1921 | break; | |
1922 | case NDTPA_MCAST_PROBES: | |
1923 | p->mcast_probes = nla_get_u32(tbp[i]); | |
1924 | break; | |
1925 | case NDTPA_BASE_REACHABLE_TIME: | |
1926 | p->base_reachable_time = nla_get_msecs(tbp[i]); | |
1927 | break; | |
1928 | case NDTPA_GC_STALETIME: | |
1929 | p->gc_staletime = nla_get_msecs(tbp[i]); | |
1930 | break; | |
1931 | case NDTPA_DELAY_PROBE_TIME: | |
1932 | p->delay_probe_time = nla_get_msecs(tbp[i]); | |
1933 | break; | |
1934 | case NDTPA_RETRANS_TIME: | |
1935 | p->retrans_time = nla_get_msecs(tbp[i]); | |
1936 | break; | |
1937 | case NDTPA_ANYCAST_DELAY: | |
1938 | p->anycast_delay = nla_get_msecs(tbp[i]); | |
1939 | break; | |
1940 | case NDTPA_PROXY_DELAY: | |
1941 | p->proxy_delay = nla_get_msecs(tbp[i]); | |
1942 | break; | |
1943 | case NDTPA_LOCKTIME: | |
1944 | p->locktime = nla_get_msecs(tbp[i]); | |
1945 | break; | |
1946 | } | |
1947 | } | |
1948 | } | |
c7fb64db | 1949 | |
6b3f8674 TG |
1950 | if (tb[NDTA_THRESH1]) |
1951 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 1952 | |
6b3f8674 TG |
1953 | if (tb[NDTA_THRESH2]) |
1954 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 1955 | |
6b3f8674 TG |
1956 | if (tb[NDTA_THRESH3]) |
1957 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 1958 | |
6b3f8674 TG |
1959 | if (tb[NDTA_GC_INTERVAL]) |
1960 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
1961 | |
1962 | err = 0; | |
1963 | ||
6b3f8674 | 1964 | errout_tbl_lock: |
c7fb64db | 1965 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 1966 | errout_locked: |
c7fb64db | 1967 | read_unlock(&neigh_tbl_lock); |
6b3f8674 | 1968 | errout: |
c7fb64db TG |
1969 | return err; |
1970 | } | |
1971 | ||
c8822a4e | 1972 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 1973 | { |
3b1e0a65 | 1974 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
1975 | int family, tidx, nidx = 0; |
1976 | int tbl_skip = cb->args[0]; | |
1977 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
1978 | struct neigh_table *tbl; |
1979 | ||
ca860fb3 | 1980 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db TG |
1981 | |
1982 | read_lock(&neigh_tbl_lock); | |
ca860fb3 | 1983 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
c7fb64db TG |
1984 | struct neigh_parms *p; |
1985 | ||
ca860fb3 | 1986 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
1987 | continue; |
1988 | ||
ca860fb3 TG |
1989 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
1990 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, | |
1991 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1992 | break; |
1993 | ||
426b5303 | 1994 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
878628fb | 1995 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
1996 | continue; |
1997 | ||
efc683fc GK |
1998 | if (nidx < neigh_skip) |
1999 | goto next; | |
c7fb64db | 2000 | |
ca860fb3 TG |
2001 | if (neightbl_fill_param_info(skb, tbl, p, |
2002 | NETLINK_CB(cb->skb).pid, | |
2003 | cb->nlh->nlmsg_seq, | |
2004 | RTM_NEWNEIGHTBL, | |
2005 | NLM_F_MULTI) <= 0) | |
c7fb64db | 2006 | goto out; |
efc683fc GK |
2007 | next: |
2008 | nidx++; | |
c7fb64db TG |
2009 | } |
2010 | ||
ca860fb3 | 2011 | neigh_skip = 0; |
c7fb64db TG |
2012 | } |
2013 | out: | |
2014 | read_unlock(&neigh_tbl_lock); | |
ca860fb3 TG |
2015 | cb->args[0] = tidx; |
2016 | cb->args[1] = nidx; | |
c7fb64db TG |
2017 | |
2018 | return skb->len; | |
2019 | } | |
1da177e4 | 2020 | |
8b8aec50 TG |
2021 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2022 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2023 | { |
2024 | unsigned long now = jiffies; | |
1da177e4 | 2025 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2026 | struct nlmsghdr *nlh; |
2027 | struct ndmsg *ndm; | |
2028 | ||
2029 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2030 | if (nlh == NULL) | |
26932566 | 2031 | return -EMSGSIZE; |
1da177e4 | 2032 | |
8b8aec50 TG |
2033 | ndm = nlmsg_data(nlh); |
2034 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2035 | ndm->ndm_pad1 = 0; |
2036 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2037 | ndm->ndm_flags = neigh->flags; |
2038 | ndm->ndm_type = neigh->type; | |
2039 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2040 | |
8b8aec50 TG |
2041 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
2042 | ||
2043 | read_lock_bh(&neigh->lock); | |
2044 | ndm->ndm_state = neigh->nud_state; | |
2045 | if ((neigh->nud_state & NUD_VALID) && | |
2046 | nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, neigh->ha) < 0) { | |
2047 | read_unlock_bh(&neigh->lock); | |
2048 | goto nla_put_failure; | |
2049 | } | |
2050 | ||
b9f5f52c SH |
2051 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2052 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2053 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2054 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2055 | read_unlock_bh(&neigh->lock); | |
2056 | ||
2057 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); | |
2058 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); | |
2059 | ||
2060 | return nlmsg_end(skb, nlh); | |
2061 | ||
2062 | nla_put_failure: | |
26932566 PM |
2063 | nlmsg_cancel(skb, nlh); |
2064 | return -EMSGSIZE; | |
1da177e4 LT |
2065 | } |
2066 | ||
d961db35 TG |
2067 | static void neigh_update_notify(struct neighbour *neigh) |
2068 | { | |
2069 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2070 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2071 | } | |
1da177e4 LT |
2072 | |
2073 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2074 | struct netlink_callback *cb) | |
2075 | { | |
3b1e0a65 | 2076 | struct net * net = sock_net(skb->sk); |
1da177e4 LT |
2077 | struct neighbour *n; |
2078 | int rc, h, s_h = cb->args[1]; | |
2079 | int idx, s_idx = idx = cb->args[2]; | |
2080 | ||
c5e29460 | 2081 | read_lock_bh(&tbl->lock); |
1da177e4 LT |
2082 | for (h = 0; h <= tbl->hash_mask; h++) { |
2083 | if (h < s_h) | |
2084 | continue; | |
2085 | if (h > s_h) | |
2086 | s_idx = 0; | |
426b5303 | 2087 | for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next) { |
c346dca1 | 2088 | if (dev_net(n->dev) != net) |
426b5303 | 2089 | continue; |
efc683fc GK |
2090 | if (idx < s_idx) |
2091 | goto next; | |
1da177e4 LT |
2092 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, |
2093 | cb->nlh->nlmsg_seq, | |
b6544c0b JHS |
2094 | RTM_NEWNEIGH, |
2095 | NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2096 | read_unlock_bh(&tbl->lock); |
2097 | rc = -1; | |
2098 | goto out; | |
2099 | } | |
efc683fc GK |
2100 | next: |
2101 | idx++; | |
1da177e4 | 2102 | } |
1da177e4 | 2103 | } |
c5e29460 | 2104 | read_unlock_bh(&tbl->lock); |
1da177e4 LT |
2105 | rc = skb->len; |
2106 | out: | |
2107 | cb->args[1] = h; | |
2108 | cb->args[2] = idx; | |
2109 | return rc; | |
2110 | } | |
2111 | ||
c8822a4e | 2112 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2113 | { |
2114 | struct neigh_table *tbl; | |
2115 | int t, family, s_t; | |
2116 | ||
2117 | read_lock(&neigh_tbl_lock); | |
8b8aec50 | 2118 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
1da177e4 LT |
2119 | s_t = cb->args[0]; |
2120 | ||
2121 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { | |
2122 | if (t < s_t || (family && tbl->family != family)) | |
2123 | continue; | |
2124 | if (t > s_t) | |
2125 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2126 | sizeof(cb->args[0])); | |
2127 | if (neigh_dump_table(tbl, skb, cb) < 0) | |
2128 | break; | |
2129 | } | |
2130 | read_unlock(&neigh_tbl_lock); | |
2131 | ||
2132 | cb->args[0] = t; | |
2133 | return skb->len; | |
2134 | } | |
2135 | ||
2136 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2137 | { | |
2138 | int chain; | |
2139 | ||
2140 | read_lock_bh(&tbl->lock); | |
2141 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2142 | struct neighbour *n; | |
2143 | ||
2144 | for (n = tbl->hash_buckets[chain]; n; n = n->next) | |
2145 | cb(n, cookie); | |
2146 | } | |
2147 | read_unlock_bh(&tbl->lock); | |
2148 | } | |
2149 | EXPORT_SYMBOL(neigh_for_each); | |
2150 | ||
2151 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2152 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2153 | int (*cb)(struct neighbour *)) | |
2154 | { | |
2155 | int chain; | |
2156 | ||
2157 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2158 | struct neighbour *n, **np; | |
2159 | ||
2160 | np = &tbl->hash_buckets[chain]; | |
2161 | while ((n = *np) != NULL) { | |
2162 | int release; | |
2163 | ||
2164 | write_lock(&n->lock); | |
2165 | release = cb(n); | |
2166 | if (release) { | |
2167 | *np = n->next; | |
2168 | n->dead = 1; | |
2169 | } else | |
2170 | np = &n->next; | |
2171 | write_unlock(&n->lock); | |
4f494554 TG |
2172 | if (release) |
2173 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2174 | } |
2175 | } | |
2176 | } | |
2177 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2178 | ||
2179 | #ifdef CONFIG_PROC_FS | |
2180 | ||
2181 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2182 | { | |
2183 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2184 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2185 | struct neigh_table *tbl = state->tbl; |
2186 | struct neighbour *n = NULL; | |
2187 | int bucket = state->bucket; | |
2188 | ||
2189 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
2190 | for (bucket = 0; bucket <= tbl->hash_mask; bucket++) { | |
2191 | n = tbl->hash_buckets[bucket]; | |
2192 | ||
2193 | while (n) { | |
878628fb | 2194 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2195 | goto next; |
1da177e4 LT |
2196 | if (state->neigh_sub_iter) { |
2197 | loff_t fakep = 0; | |
2198 | void *v; | |
2199 | ||
2200 | v = state->neigh_sub_iter(state, n, &fakep); | |
2201 | if (!v) | |
2202 | goto next; | |
2203 | } | |
2204 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2205 | break; | |
2206 | if (n->nud_state & ~NUD_NOARP) | |
2207 | break; | |
2208 | next: | |
2209 | n = n->next; | |
2210 | } | |
2211 | ||
2212 | if (n) | |
2213 | break; | |
2214 | } | |
2215 | state->bucket = bucket; | |
2216 | ||
2217 | return n; | |
2218 | } | |
2219 | ||
2220 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2221 | struct neighbour *n, | |
2222 | loff_t *pos) | |
2223 | { | |
2224 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2225 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2226 | struct neigh_table *tbl = state->tbl; |
2227 | ||
2228 | if (state->neigh_sub_iter) { | |
2229 | void *v = state->neigh_sub_iter(state, n, pos); | |
2230 | if (v) | |
2231 | return n; | |
2232 | } | |
2233 | n = n->next; | |
2234 | ||
2235 | while (1) { | |
2236 | while (n) { | |
878628fb | 2237 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2238 | goto next; |
1da177e4 LT |
2239 | if (state->neigh_sub_iter) { |
2240 | void *v = state->neigh_sub_iter(state, n, pos); | |
2241 | if (v) | |
2242 | return n; | |
2243 | goto next; | |
2244 | } | |
2245 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2246 | break; | |
2247 | ||
2248 | if (n->nud_state & ~NUD_NOARP) | |
2249 | break; | |
2250 | next: | |
2251 | n = n->next; | |
2252 | } | |
2253 | ||
2254 | if (n) | |
2255 | break; | |
2256 | ||
2257 | if (++state->bucket > tbl->hash_mask) | |
2258 | break; | |
2259 | ||
2260 | n = tbl->hash_buckets[state->bucket]; | |
2261 | } | |
2262 | ||
2263 | if (n && pos) | |
2264 | --(*pos); | |
2265 | return n; | |
2266 | } | |
2267 | ||
2268 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2269 | { | |
2270 | struct neighbour *n = neigh_get_first(seq); | |
2271 | ||
2272 | if (n) { | |
745e2031 | 2273 | --(*pos); |
1da177e4 LT |
2274 | while (*pos) { |
2275 | n = neigh_get_next(seq, n, pos); | |
2276 | if (!n) | |
2277 | break; | |
2278 | } | |
2279 | } | |
2280 | return *pos ? NULL : n; | |
2281 | } | |
2282 | ||
2283 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2284 | { | |
2285 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2286 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2287 | struct neigh_table *tbl = state->tbl; |
2288 | struct pneigh_entry *pn = NULL; | |
2289 | int bucket = state->bucket; | |
2290 | ||
2291 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2292 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2293 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2294 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2295 | pn = pn->next; |
1da177e4 LT |
2296 | if (pn) |
2297 | break; | |
2298 | } | |
2299 | state->bucket = bucket; | |
2300 | ||
2301 | return pn; | |
2302 | } | |
2303 | ||
2304 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2305 | struct pneigh_entry *pn, | |
2306 | loff_t *pos) | |
2307 | { | |
2308 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2309 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2310 | struct neigh_table *tbl = state->tbl; |
2311 | ||
2312 | pn = pn->next; | |
2313 | while (!pn) { | |
2314 | if (++state->bucket > PNEIGH_HASHMASK) | |
2315 | break; | |
2316 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2317 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2318 | pn = pn->next; |
1da177e4 LT |
2319 | if (pn) |
2320 | break; | |
2321 | } | |
2322 | ||
2323 | if (pn && pos) | |
2324 | --(*pos); | |
2325 | ||
2326 | return pn; | |
2327 | } | |
2328 | ||
2329 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2330 | { | |
2331 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2332 | ||
2333 | if (pn) { | |
745e2031 | 2334 | --(*pos); |
1da177e4 LT |
2335 | while (*pos) { |
2336 | pn = pneigh_get_next(seq, pn, pos); | |
2337 | if (!pn) | |
2338 | break; | |
2339 | } | |
2340 | } | |
2341 | return *pos ? NULL : pn; | |
2342 | } | |
2343 | ||
2344 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2345 | { | |
2346 | struct neigh_seq_state *state = seq->private; | |
2347 | void *rc; | |
745e2031 | 2348 | loff_t idxpos = *pos; |
1da177e4 | 2349 | |
745e2031 | 2350 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2351 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2352 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2353 | |
2354 | return rc; | |
2355 | } | |
2356 | ||
2357 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
9a429c49 | 2358 | __acquires(tbl->lock) |
1da177e4 LT |
2359 | { |
2360 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2361 | |
2362 | state->tbl = tbl; | |
2363 | state->bucket = 0; | |
2364 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2365 | ||
2366 | read_lock_bh(&tbl->lock); | |
2367 | ||
745e2031 | 2368 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2369 | } |
2370 | EXPORT_SYMBOL(neigh_seq_start); | |
2371 | ||
2372 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2373 | { | |
2374 | struct neigh_seq_state *state; | |
2375 | void *rc; | |
2376 | ||
2377 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2378 | rc = neigh_get_first(seq); |
1da177e4 LT |
2379 | goto out; |
2380 | } | |
2381 | ||
2382 | state = seq->private; | |
2383 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2384 | rc = neigh_get_next(seq, v, NULL); | |
2385 | if (rc) | |
2386 | goto out; | |
2387 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2388 | rc = pneigh_get_first(seq); | |
2389 | } else { | |
2390 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2391 | rc = pneigh_get_next(seq, v, NULL); | |
2392 | } | |
2393 | out: | |
2394 | ++(*pos); | |
2395 | return rc; | |
2396 | } | |
2397 | EXPORT_SYMBOL(neigh_seq_next); | |
2398 | ||
2399 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2400 | __releases(tbl->lock) |
1da177e4 LT |
2401 | { |
2402 | struct neigh_seq_state *state = seq->private; | |
2403 | struct neigh_table *tbl = state->tbl; | |
2404 | ||
2405 | read_unlock_bh(&tbl->lock); | |
2406 | } | |
2407 | EXPORT_SYMBOL(neigh_seq_stop); | |
2408 | ||
2409 | /* statistics via seq_file */ | |
2410 | ||
2411 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2412 | { | |
2413 | struct proc_dir_entry *pde = seq->private; | |
2414 | struct neigh_table *tbl = pde->data; | |
2415 | int cpu; | |
2416 | ||
2417 | if (*pos == 0) | |
2418 | return SEQ_START_TOKEN; | |
4ec93edb | 2419 | |
0f23174a | 2420 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2421 | if (!cpu_possible(cpu)) |
2422 | continue; | |
2423 | *pos = cpu+1; | |
2424 | return per_cpu_ptr(tbl->stats, cpu); | |
2425 | } | |
2426 | return NULL; | |
2427 | } | |
2428 | ||
2429 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2430 | { | |
2431 | struct proc_dir_entry *pde = seq->private; | |
2432 | struct neigh_table *tbl = pde->data; | |
2433 | int cpu; | |
2434 | ||
0f23174a | 2435 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2436 | if (!cpu_possible(cpu)) |
2437 | continue; | |
2438 | *pos = cpu+1; | |
2439 | return per_cpu_ptr(tbl->stats, cpu); | |
2440 | } | |
2441 | return NULL; | |
2442 | } | |
2443 | ||
2444 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2445 | { | |
2446 | ||
2447 | } | |
2448 | ||
2449 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2450 | { | |
2451 | struct proc_dir_entry *pde = seq->private; | |
2452 | struct neigh_table *tbl = pde->data; | |
2453 | struct neigh_statistics *st = v; | |
2454 | ||
2455 | if (v == SEQ_START_TOKEN) { | |
9a6d276e | 2456 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs unresolved_discards\n"); |
1da177e4 LT |
2457 | return 0; |
2458 | } | |
2459 | ||
2460 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
9a6d276e | 2461 | "%08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2462 | atomic_read(&tbl->entries), |
2463 | ||
2464 | st->allocs, | |
2465 | st->destroys, | |
2466 | st->hash_grows, | |
2467 | ||
2468 | st->lookups, | |
2469 | st->hits, | |
2470 | ||
2471 | st->res_failed, | |
2472 | ||
2473 | st->rcv_probes_mcast, | |
2474 | st->rcv_probes_ucast, | |
2475 | ||
2476 | st->periodic_gc_runs, | |
9a6d276e NH |
2477 | st->forced_gc_runs, |
2478 | st->unres_discards | |
1da177e4 LT |
2479 | ); |
2480 | ||
2481 | return 0; | |
2482 | } | |
2483 | ||
f690808e | 2484 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2485 | .start = neigh_stat_seq_start, |
2486 | .next = neigh_stat_seq_next, | |
2487 | .stop = neigh_stat_seq_stop, | |
2488 | .show = neigh_stat_seq_show, | |
2489 | }; | |
2490 | ||
2491 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2492 | { | |
2493 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2494 | ||
2495 | if (!ret) { | |
2496 | struct seq_file *sf = file->private_data; | |
2497 | sf->private = PDE(inode); | |
2498 | } | |
2499 | return ret; | |
2500 | }; | |
2501 | ||
9a32144e | 2502 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2503 | .owner = THIS_MODULE, |
2504 | .open = neigh_stat_seq_open, | |
2505 | .read = seq_read, | |
2506 | .llseek = seq_lseek, | |
2507 | .release = seq_release, | |
2508 | }; | |
2509 | ||
2510 | #endif /* CONFIG_PROC_FS */ | |
2511 | ||
339bf98f TG |
2512 | static inline size_t neigh_nlmsg_size(void) |
2513 | { | |
2514 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2515 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2516 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2517 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2518 | + nla_total_size(4); /* NDA_PROBES */ | |
2519 | } | |
2520 | ||
b8673311 | 2521 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2522 | { |
c346dca1 | 2523 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2524 | struct sk_buff *skb; |
b8673311 | 2525 | int err = -ENOBUFS; |
1da177e4 | 2526 | |
339bf98f | 2527 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2528 | if (skb == NULL) |
b8673311 | 2529 | goto errout; |
1da177e4 | 2530 | |
b8673311 | 2531 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2532 | if (err < 0) { |
2533 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2534 | WARN_ON(err == -EMSGSIZE); | |
2535 | kfree_skb(skb); | |
2536 | goto errout; | |
2537 | } | |
1ce85fe4 PNA |
2538 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2539 | return; | |
b8673311 TG |
2540 | errout: |
2541 | if (err < 0) | |
426b5303 | 2542 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2543 | } |
2544 | ||
d961db35 | 2545 | #ifdef CONFIG_ARPD |
b8673311 | 2546 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2547 | { |
b8673311 TG |
2548 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2549 | } | |
0a204500 | 2550 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2551 | #endif /* CONFIG_ARPD */ |
2552 | ||
2553 | #ifdef CONFIG_SYSCTL | |
2554 | ||
2555 | static struct neigh_sysctl_table { | |
2556 | struct ctl_table_header *sysctl_header; | |
c3bac5a7 PE |
2557 | struct ctl_table neigh_vars[__NET_NEIGH_MAX]; |
2558 | char *dev_name; | |
ab32ea5d | 2559 | } neigh_sysctl_template __read_mostly = { |
1da177e4 LT |
2560 | .neigh_vars = { |
2561 | { | |
2562 | .ctl_name = NET_NEIGH_MCAST_SOLICIT, | |
2563 | .procname = "mcast_solicit", | |
2564 | .maxlen = sizeof(int), | |
2565 | .mode = 0644, | |
6d9f239a | 2566 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2567 | }, |
2568 | { | |
2569 | .ctl_name = NET_NEIGH_UCAST_SOLICIT, | |
2570 | .procname = "ucast_solicit", | |
2571 | .maxlen = sizeof(int), | |
2572 | .mode = 0644, | |
6d9f239a | 2573 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2574 | }, |
2575 | { | |
2576 | .ctl_name = NET_NEIGH_APP_SOLICIT, | |
2577 | .procname = "app_solicit", | |
2578 | .maxlen = sizeof(int), | |
2579 | .mode = 0644, | |
6d9f239a | 2580 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2581 | }, |
2582 | { | |
1da177e4 LT |
2583 | .procname = "retrans_time", |
2584 | .maxlen = sizeof(int), | |
2585 | .mode = 0644, | |
6d9f239a | 2586 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2587 | }, |
2588 | { | |
2589 | .ctl_name = NET_NEIGH_REACHABLE_TIME, | |
2590 | .procname = "base_reachable_time", | |
2591 | .maxlen = sizeof(int), | |
2592 | .mode = 0644, | |
6d9f239a AD |
2593 | .proc_handler = proc_dointvec_jiffies, |
2594 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2595 | }, |
2596 | { | |
2597 | .ctl_name = NET_NEIGH_DELAY_PROBE_TIME, | |
2598 | .procname = "delay_first_probe_time", | |
2599 | .maxlen = sizeof(int), | |
2600 | .mode = 0644, | |
6d9f239a AD |
2601 | .proc_handler = proc_dointvec_jiffies, |
2602 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2603 | }, |
2604 | { | |
2605 | .ctl_name = NET_NEIGH_GC_STALE_TIME, | |
2606 | .procname = "gc_stale_time", | |
2607 | .maxlen = sizeof(int), | |
2608 | .mode = 0644, | |
6d9f239a AD |
2609 | .proc_handler = proc_dointvec_jiffies, |
2610 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2611 | }, |
2612 | { | |
2613 | .ctl_name = NET_NEIGH_UNRES_QLEN, | |
2614 | .procname = "unres_qlen", | |
2615 | .maxlen = sizeof(int), | |
2616 | .mode = 0644, | |
6d9f239a | 2617 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2618 | }, |
2619 | { | |
2620 | .ctl_name = NET_NEIGH_PROXY_QLEN, | |
2621 | .procname = "proxy_qlen", | |
2622 | .maxlen = sizeof(int), | |
2623 | .mode = 0644, | |
6d9f239a | 2624 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2625 | }, |
2626 | { | |
1da177e4 LT |
2627 | .procname = "anycast_delay", |
2628 | .maxlen = sizeof(int), | |
2629 | .mode = 0644, | |
6d9f239a | 2630 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2631 | }, |
2632 | { | |
1da177e4 LT |
2633 | .procname = "proxy_delay", |
2634 | .maxlen = sizeof(int), | |
2635 | .mode = 0644, | |
6d9f239a | 2636 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2637 | }, |
2638 | { | |
1da177e4 LT |
2639 | .procname = "locktime", |
2640 | .maxlen = sizeof(int), | |
2641 | .mode = 0644, | |
6d9f239a | 2642 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 | 2643 | }, |
d12af679 EB |
2644 | { |
2645 | .ctl_name = NET_NEIGH_RETRANS_TIME_MS, | |
2646 | .procname = "retrans_time_ms", | |
2647 | .maxlen = sizeof(int), | |
2648 | .mode = 0644, | |
6d9f239a AD |
2649 | .proc_handler = proc_dointvec_ms_jiffies, |
2650 | .strategy = sysctl_ms_jiffies, | |
d12af679 EB |
2651 | }, |
2652 | { | |
2653 | .ctl_name = NET_NEIGH_REACHABLE_TIME_MS, | |
2654 | .procname = "base_reachable_time_ms", | |
2655 | .maxlen = sizeof(int), | |
2656 | .mode = 0644, | |
6d9f239a AD |
2657 | .proc_handler = proc_dointvec_ms_jiffies, |
2658 | .strategy = sysctl_ms_jiffies, | |
d12af679 | 2659 | }, |
1da177e4 LT |
2660 | { |
2661 | .ctl_name = NET_NEIGH_GC_INTERVAL, | |
2662 | .procname = "gc_interval", | |
2663 | .maxlen = sizeof(int), | |
2664 | .mode = 0644, | |
6d9f239a AD |
2665 | .proc_handler = proc_dointvec_jiffies, |
2666 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2667 | }, |
2668 | { | |
2669 | .ctl_name = NET_NEIGH_GC_THRESH1, | |
2670 | .procname = "gc_thresh1", | |
2671 | .maxlen = sizeof(int), | |
2672 | .mode = 0644, | |
6d9f239a | 2673 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2674 | }, |
2675 | { | |
2676 | .ctl_name = NET_NEIGH_GC_THRESH2, | |
2677 | .procname = "gc_thresh2", | |
2678 | .maxlen = sizeof(int), | |
2679 | .mode = 0644, | |
6d9f239a | 2680 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2681 | }, |
2682 | { | |
2683 | .ctl_name = NET_NEIGH_GC_THRESH3, | |
2684 | .procname = "gc_thresh3", | |
2685 | .maxlen = sizeof(int), | |
2686 | .mode = 0644, | |
6d9f239a | 2687 | .proc_handler = proc_dointvec, |
1da177e4 | 2688 | }, |
c3bac5a7 | 2689 | {}, |
1da177e4 LT |
2690 | }, |
2691 | }; | |
2692 | ||
2693 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
4ec93edb | 2694 | int p_id, int pdev_id, char *p_name, |
1da177e4 LT |
2695 | proc_handler *handler, ctl_handler *strategy) |
2696 | { | |
3c607bbb | 2697 | struct neigh_sysctl_table *t; |
1da177e4 | 2698 | const char *dev_name_source = NULL; |
c3bac5a7 PE |
2699 | |
2700 | #define NEIGH_CTL_PATH_ROOT 0 | |
2701 | #define NEIGH_CTL_PATH_PROTO 1 | |
2702 | #define NEIGH_CTL_PATH_NEIGH 2 | |
2703 | #define NEIGH_CTL_PATH_DEV 3 | |
2704 | ||
2705 | struct ctl_path neigh_path[] = { | |
2706 | { .procname = "net", .ctl_name = CTL_NET, }, | |
2707 | { .procname = "proto", .ctl_name = 0, }, | |
2708 | { .procname = "neigh", .ctl_name = 0, }, | |
2709 | { .procname = "default", .ctl_name = NET_PROTO_CONF_DEFAULT, }, | |
2710 | { }, | |
2711 | }; | |
1da177e4 | 2712 | |
3c607bbb | 2713 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2714 | if (!t) |
3c607bbb PE |
2715 | goto err; |
2716 | ||
1da177e4 LT |
2717 | t->neigh_vars[0].data = &p->mcast_probes; |
2718 | t->neigh_vars[1].data = &p->ucast_probes; | |
2719 | t->neigh_vars[2].data = &p->app_probes; | |
2720 | t->neigh_vars[3].data = &p->retrans_time; | |
2721 | t->neigh_vars[4].data = &p->base_reachable_time; | |
2722 | t->neigh_vars[5].data = &p->delay_probe_time; | |
2723 | t->neigh_vars[6].data = &p->gc_staletime; | |
2724 | t->neigh_vars[7].data = &p->queue_len; | |
2725 | t->neigh_vars[8].data = &p->proxy_qlen; | |
2726 | t->neigh_vars[9].data = &p->anycast_delay; | |
2727 | t->neigh_vars[10].data = &p->proxy_delay; | |
2728 | t->neigh_vars[11].data = &p->locktime; | |
d12af679 EB |
2729 | t->neigh_vars[12].data = &p->retrans_time; |
2730 | t->neigh_vars[13].data = &p->base_reachable_time; | |
1da177e4 LT |
2731 | |
2732 | if (dev) { | |
2733 | dev_name_source = dev->name; | |
c3bac5a7 | 2734 | neigh_path[NEIGH_CTL_PATH_DEV].ctl_name = dev->ifindex; |
d12af679 EB |
2735 | /* Terminate the table early */ |
2736 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); | |
1da177e4 | 2737 | } else { |
c3bac5a7 | 2738 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
d12af679 EB |
2739 | t->neigh_vars[14].data = (int *)(p + 1); |
2740 | t->neigh_vars[15].data = (int *)(p + 1) + 1; | |
2741 | t->neigh_vars[16].data = (int *)(p + 1) + 2; | |
2742 | t->neigh_vars[17].data = (int *)(p + 1) + 3; | |
1da177e4 LT |
2743 | } |
2744 | ||
1da177e4 LT |
2745 | |
2746 | if (handler || strategy) { | |
2747 | /* RetransTime */ | |
2748 | t->neigh_vars[3].proc_handler = handler; | |
2749 | t->neigh_vars[3].strategy = strategy; | |
2750 | t->neigh_vars[3].extra1 = dev; | |
d12af679 EB |
2751 | if (!strategy) |
2752 | t->neigh_vars[3].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2753 | /* ReachableTime */ |
2754 | t->neigh_vars[4].proc_handler = handler; | |
2755 | t->neigh_vars[4].strategy = strategy; | |
2756 | t->neigh_vars[4].extra1 = dev; | |
d12af679 EB |
2757 | if (!strategy) |
2758 | t->neigh_vars[4].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2759 | /* RetransTime (in milliseconds)*/ |
d12af679 EB |
2760 | t->neigh_vars[12].proc_handler = handler; |
2761 | t->neigh_vars[12].strategy = strategy; | |
2762 | t->neigh_vars[12].extra1 = dev; | |
2763 | if (!strategy) | |
2764 | t->neigh_vars[12].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2765 | /* ReachableTime (in milliseconds) */ |
d12af679 EB |
2766 | t->neigh_vars[13].proc_handler = handler; |
2767 | t->neigh_vars[13].strategy = strategy; | |
2768 | t->neigh_vars[13].extra1 = dev; | |
2769 | if (!strategy) | |
2770 | t->neigh_vars[13].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2771 | } |
2772 | ||
c3bac5a7 PE |
2773 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
2774 | if (!t->dev_name) | |
1da177e4 | 2775 | goto free; |
1da177e4 | 2776 | |
c3bac5a7 PE |
2777 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
2778 | neigh_path[NEIGH_CTL_PATH_NEIGH].ctl_name = pdev_id; | |
2779 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; | |
2780 | neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id; | |
1da177e4 | 2781 | |
4ab438fc | 2782 | t->sysctl_header = |
57da52c1 | 2783 | register_net_sysctl_table(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 2784 | if (!t->sysctl_header) |
1da177e4 | 2785 | goto free_procname; |
3c607bbb | 2786 | |
1da177e4 LT |
2787 | p->sysctl_table = t; |
2788 | return 0; | |
2789 | ||
3c607bbb | 2790 | free_procname: |
c3bac5a7 | 2791 | kfree(t->dev_name); |
3c607bbb | 2792 | free: |
1da177e4 | 2793 | kfree(t); |
3c607bbb PE |
2794 | err: |
2795 | return -ENOBUFS; | |
1da177e4 | 2796 | } |
0a204500 | 2797 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
2798 | |
2799 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
2800 | { | |
2801 | if (p->sysctl_table) { | |
2802 | struct neigh_sysctl_table *t = p->sysctl_table; | |
2803 | p->sysctl_table = NULL; | |
2804 | unregister_sysctl_table(t->sysctl_header); | |
c3bac5a7 | 2805 | kfree(t->dev_name); |
1da177e4 LT |
2806 | kfree(t); |
2807 | } | |
2808 | } | |
0a204500 | 2809 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
2810 | |
2811 | #endif /* CONFIG_SYSCTL */ | |
2812 | ||
c8822a4e TG |
2813 | static int __init neigh_init(void) |
2814 | { | |
2815 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL); | |
2816 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL); | |
2817 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info); | |
2818 | ||
2819 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info); | |
2820 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL); | |
2821 | ||
2822 | return 0; | |
2823 | } | |
2824 | ||
2825 | subsys_initcall(neigh_init); | |
2826 |