Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Generic address resolution entity | |
3 | * | |
4 | * Authors: | |
5 | * Pedro Roque <roque@di.fc.ul.pt> | |
6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Fixes: | |
14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
15 | * Harald Welte Add neighbour cache statistics like rtstat | |
16 | */ | |
17 | ||
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/socket.h> | |
1da177e4 LT |
22 | #include <linux/netdevice.h> |
23 | #include <linux/proc_fs.h> | |
24 | #ifdef CONFIG_SYSCTL | |
25 | #include <linux/sysctl.h> | |
26 | #endif | |
27 | #include <linux/times.h> | |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 LT |
29 | #include <net/neighbour.h> |
30 | #include <net/dst.h> | |
31 | #include <net/sock.h> | |
8d71740c | 32 | #include <net/netevent.h> |
a14a49d2 | 33 | #include <net/netlink.h> |
1da177e4 LT |
34 | #include <linux/rtnetlink.h> |
35 | #include <linux/random.h> | |
543537bd | 36 | #include <linux/string.h> |
c3609d51 | 37 | #include <linux/log2.h> |
1da177e4 LT |
38 | |
39 | #define NEIGH_DEBUG 1 | |
40 | ||
41 | #define NEIGH_PRINTK(x...) printk(x) | |
42 | #define NEIGH_NOPRINTK(x...) do { ; } while(0) | |
43 | #define NEIGH_PRINTK0 NEIGH_PRINTK | |
44 | #define NEIGH_PRINTK1 NEIGH_NOPRINTK | |
45 | #define NEIGH_PRINTK2 NEIGH_NOPRINTK | |
46 | ||
47 | #if NEIGH_DEBUG >= 1 | |
48 | #undef NEIGH_PRINTK1 | |
49 | #define NEIGH_PRINTK1 NEIGH_PRINTK | |
50 | #endif | |
51 | #if NEIGH_DEBUG >= 2 | |
52 | #undef NEIGH_PRINTK2 | |
53 | #define NEIGH_PRINTK2 NEIGH_PRINTK | |
54 | #endif | |
55 | ||
56 | #define PNEIGH_HASHMASK 0xF | |
57 | ||
58 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
59 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
60 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 61 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 LT |
62 | |
63 | static struct neigh_table *neigh_tables; | |
45fc3b11 | 64 | #ifdef CONFIG_PROC_FS |
9a32144e | 65 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 66 | #endif |
1da177e4 LT |
67 | |
68 | /* | |
69 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
70 | ||
71 | - All the scans/updates to hash buckets MUST be made under this lock. | |
72 | - NOTHING clever should be made under this lock: no callbacks | |
73 | to protocol backends, no attempts to send something to network. | |
74 | It will result in deadlocks, if backend/driver wants to use neighbour | |
75 | cache. | |
76 | - If the entry requires some non-trivial actions, increase | |
77 | its reference count and release table lock. | |
78 | ||
79 | Neighbour entries are protected: | |
80 | - with reference count. | |
81 | - with rwlock neigh->lock | |
82 | ||
83 | Reference count prevents destruction. | |
84 | ||
85 | neigh->lock mainly serializes ll address data and its validity state. | |
86 | However, the same lock is used to protect another entry fields: | |
87 | - timer | |
88 | - resolution queue | |
89 | ||
90 | Again, nothing clever shall be made under neigh->lock, | |
91 | the most complicated procedure, which we allow is dev->hard_header. | |
92 | It is supposed, that dev->hard_header is simplistic and does | |
93 | not make callbacks to neighbour tables. | |
94 | ||
95 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting | |
96 | list of neighbour tables. This list is used only in process context, | |
97 | */ | |
98 | ||
99 | static DEFINE_RWLOCK(neigh_tbl_lock); | |
100 | ||
101 | static int neigh_blackhole(struct sk_buff *skb) | |
102 | { | |
103 | kfree_skb(skb); | |
104 | return -ENETDOWN; | |
105 | } | |
106 | ||
4f494554 TG |
107 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
108 | { | |
109 | if (neigh->parms->neigh_cleanup) | |
110 | neigh->parms->neigh_cleanup(neigh); | |
111 | ||
d961db35 | 112 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
113 | neigh_release(neigh); |
114 | } | |
115 | ||
1da177e4 LT |
116 | /* |
117 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
118 | * It corresponds to default IPv6 settings and is not overridable, | |
119 | * because it is really reasonable choice. | |
120 | */ | |
121 | ||
122 | unsigned long neigh_rand_reach_time(unsigned long base) | |
123 | { | |
124 | return (base ? (net_random() % base) + (base >> 1) : 0); | |
125 | } | |
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 :( */ | |
1091 | if (skb->dst && skb->dst->neighbour) | |
1092 | n1 = skb->dst->neighbour; | |
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 | { | |
1185 | struct dst_entry *dst = skb->dst; | |
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; | |
1232 | struct dst_entry *dst = skb->dst; | |
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 | } | |
1301 | dst_release(skb->dst); | |
1302 | skb->dst = NULL; | |
1303 | dev_hold(skb->dev); | |
1304 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1305 | mod_timer(&tbl->proxy_timer, sched_next); | |
1306 | spin_unlock(&tbl->proxy_queue.lock); | |
1307 | } | |
0a204500 | 1308 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1309 | |
426b5303 EB |
1310 | static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl, |
1311 | struct net *net, int ifindex) | |
1312 | { | |
1313 | struct neigh_parms *p; | |
1314 | ||
1315 | for (p = &tbl->parms; p; p = p->next) { | |
878628fb | 1316 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
426b5303 EB |
1317 | (!p->dev && !ifindex)) |
1318 | return p; | |
1319 | } | |
1320 | ||
1321 | return NULL; | |
1322 | } | |
1da177e4 LT |
1323 | |
1324 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1325 | struct neigh_table *tbl) | |
1326 | { | |
426b5303 | 1327 | struct neigh_parms *p, *ref; |
00829823 SH |
1328 | struct net *net = dev_net(dev); |
1329 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1330 | |
426b5303 EB |
1331 | ref = lookup_neigh_params(tbl, net, 0); |
1332 | if (!ref) | |
1333 | return NULL; | |
1da177e4 | 1334 | |
426b5303 | 1335 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1336 | if (p) { |
1da177e4 LT |
1337 | p->tbl = tbl; |
1338 | atomic_set(&p->refcnt, 1); | |
1da177e4 LT |
1339 | p->reachable_time = |
1340 | neigh_rand_reach_time(p->base_reachable_time); | |
c7fb64db | 1341 | |
00829823 | 1342 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
486b51d3 DL |
1343 | kfree(p); |
1344 | return NULL; | |
1da177e4 | 1345 | } |
486b51d3 DL |
1346 | |
1347 | dev_hold(dev); | |
1348 | p->dev = dev; | |
e42ea986 | 1349 | write_pnet(&p->net, hold_net(net)); |
1da177e4 LT |
1350 | p->sysctl_table = NULL; |
1351 | write_lock_bh(&tbl->lock); | |
1352 | p->next = tbl->parms.next; | |
1353 | tbl->parms.next = p; | |
1354 | write_unlock_bh(&tbl->lock); | |
1355 | } | |
1356 | return p; | |
1357 | } | |
0a204500 | 1358 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1359 | |
1360 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1361 | { | |
1362 | struct neigh_parms *parms = | |
1363 | container_of(head, struct neigh_parms, rcu_head); | |
1364 | ||
1365 | neigh_parms_put(parms); | |
1366 | } | |
1367 | ||
1368 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1369 | { | |
1370 | struct neigh_parms **p; | |
1371 | ||
1372 | if (!parms || parms == &tbl->parms) | |
1373 | return; | |
1374 | write_lock_bh(&tbl->lock); | |
1375 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { | |
1376 | if (*p == parms) { | |
1377 | *p = parms->next; | |
1378 | parms->dead = 1; | |
1379 | write_unlock_bh(&tbl->lock); | |
cecbb639 DM |
1380 | if (parms->dev) |
1381 | dev_put(parms->dev); | |
1da177e4 LT |
1382 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1383 | return; | |
1384 | } | |
1385 | } | |
1386 | write_unlock_bh(&tbl->lock); | |
1387 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); | |
1388 | } | |
0a204500 | 1389 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1390 | |
06f0511d | 1391 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1392 | { |
57da52c1 | 1393 | release_net(neigh_parms_net(parms)); |
1da177e4 LT |
1394 | kfree(parms); |
1395 | } | |
1396 | ||
c2ecba71 PE |
1397 | static struct lock_class_key neigh_table_proxy_queue_class; |
1398 | ||
bd89efc5 | 1399 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
1da177e4 LT |
1400 | { |
1401 | unsigned long now = jiffies; | |
1402 | unsigned long phsize; | |
1403 | ||
e42ea986 | 1404 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1405 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 LT |
1406 | tbl->parms.reachable_time = |
1407 | neigh_rand_reach_time(tbl->parms.base_reachable_time); | |
1408 | ||
1409 | if (!tbl->kmem_cachep) | |
e5d679f3 AD |
1410 | tbl->kmem_cachep = |
1411 | kmem_cache_create(tbl->id, tbl->entry_size, 0, | |
1412 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
20c2df83 | 1413 | NULL); |
1da177e4 LT |
1414 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1415 | if (!tbl->stats) | |
1416 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1417 | |
1da177e4 | 1418 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1419 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1420 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1421 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1422 | #endif |
1423 | ||
1424 | tbl->hash_mask = 1; | |
1425 | tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1); | |
1426 | ||
1427 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1428 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 LT |
1429 | |
1430 | if (!tbl->hash_buckets || !tbl->phash_buckets) | |
1431 | panic("cannot allocate neighbour cache hashes"); | |
1432 | ||
1da177e4 LT |
1433 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
1434 | ||
1435 | rwlock_init(&tbl->lock); | |
b24b8a24 | 1436 | setup_timer(&tbl->gc_timer, neigh_periodic_timer, (unsigned long)tbl); |
1da177e4 LT |
1437 | tbl->gc_timer.expires = now + 1; |
1438 | add_timer(&tbl->gc_timer); | |
1439 | ||
b24b8a24 | 1440 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1441 | skb_queue_head_init_class(&tbl->proxy_queue, |
1442 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1443 | |
1444 | tbl->last_flush = now; | |
1445 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1446 | } |
0a204500 | 1447 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
bd89efc5 SK |
1448 | |
1449 | void neigh_table_init(struct neigh_table *tbl) | |
1450 | { | |
1451 | struct neigh_table *tmp; | |
1452 | ||
1453 | neigh_table_init_no_netlink(tbl); | |
1da177e4 | 1454 | write_lock(&neigh_tbl_lock); |
bd89efc5 SK |
1455 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
1456 | if (tmp->family == tbl->family) | |
1457 | break; | |
1458 | } | |
1da177e4 LT |
1459 | tbl->next = neigh_tables; |
1460 | neigh_tables = tbl; | |
1461 | write_unlock(&neigh_tbl_lock); | |
bd89efc5 SK |
1462 | |
1463 | if (unlikely(tmp)) { | |
1464 | printk(KERN_ERR "NEIGH: Registering multiple tables for " | |
1465 | "family %d\n", tbl->family); | |
1466 | dump_stack(); | |
1467 | } | |
1da177e4 | 1468 | } |
0a204500 | 1469 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 LT |
1470 | |
1471 | int neigh_table_clear(struct neigh_table *tbl) | |
1472 | { | |
1473 | struct neigh_table **tp; | |
1474 | ||
1475 | /* It is not clean... Fix it to unload IPv6 module safely */ | |
1476 | del_timer_sync(&tbl->gc_timer); | |
1477 | del_timer_sync(&tbl->proxy_timer); | |
1478 | pneigh_queue_purge(&tbl->proxy_queue); | |
1479 | neigh_ifdown(tbl, NULL); | |
1480 | if (atomic_read(&tbl->entries)) | |
1481 | printk(KERN_CRIT "neighbour leakage\n"); | |
1482 | write_lock(&neigh_tbl_lock); | |
1483 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { | |
1484 | if (*tp == tbl) { | |
1485 | *tp = tbl->next; | |
1486 | break; | |
1487 | } | |
1488 | } | |
1489 | write_unlock(&neigh_tbl_lock); | |
1490 | ||
1491 | neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1); | |
1492 | tbl->hash_buckets = NULL; | |
1493 | ||
1494 | kfree(tbl->phash_buckets); | |
1495 | tbl->phash_buckets = NULL; | |
1496 | ||
3f192b5c AD |
1497 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1498 | ||
3fcde74b KK |
1499 | free_percpu(tbl->stats); |
1500 | tbl->stats = NULL; | |
1501 | ||
bfb85c9f RD |
1502 | kmem_cache_destroy(tbl->kmem_cachep); |
1503 | tbl->kmem_cachep = NULL; | |
1504 | ||
1da177e4 LT |
1505 | return 0; |
1506 | } | |
0a204500 | 1507 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1508 | |
c8822a4e | 1509 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1510 | { |
3b1e0a65 | 1511 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1512 | struct ndmsg *ndm; |
1513 | struct nlattr *dst_attr; | |
1da177e4 LT |
1514 | struct neigh_table *tbl; |
1515 | struct net_device *dev = NULL; | |
a14a49d2 | 1516 | int err = -EINVAL; |
1da177e4 | 1517 | |
a14a49d2 | 1518 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1519 | goto out; |
1520 | ||
a14a49d2 TG |
1521 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1522 | if (dst_attr == NULL) | |
1523 | goto out; | |
1524 | ||
1525 | ndm = nlmsg_data(nlh); | |
1526 | if (ndm->ndm_ifindex) { | |
881d966b | 1527 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1528 | if (dev == NULL) { |
1529 | err = -ENODEV; | |
1530 | goto out; | |
1531 | } | |
1532 | } | |
1533 | ||
1da177e4 LT |
1534 | read_lock(&neigh_tbl_lock); |
1535 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
a14a49d2 | 1536 | struct neighbour *neigh; |
1da177e4 LT |
1537 | |
1538 | if (tbl->family != ndm->ndm_family) | |
1539 | continue; | |
1540 | read_unlock(&neigh_tbl_lock); | |
1541 | ||
a14a49d2 | 1542 | if (nla_len(dst_attr) < tbl->key_len) |
1da177e4 LT |
1543 | goto out_dev_put; |
1544 | ||
1545 | if (ndm->ndm_flags & NTF_PROXY) { | |
426b5303 | 1546 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
1da177e4 LT |
1547 | goto out_dev_put; |
1548 | } | |
1549 | ||
a14a49d2 TG |
1550 | if (dev == NULL) |
1551 | goto out_dev_put; | |
1da177e4 | 1552 | |
a14a49d2 TG |
1553 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1554 | if (neigh == NULL) { | |
1555 | err = -ENOENT; | |
1556 | goto out_dev_put; | |
1da177e4 | 1557 | } |
a14a49d2 TG |
1558 | |
1559 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1560 | NEIGH_UPDATE_F_OVERRIDE | | |
1561 | NEIGH_UPDATE_F_ADMIN); | |
1562 | neigh_release(neigh); | |
1da177e4 LT |
1563 | goto out_dev_put; |
1564 | } | |
1565 | read_unlock(&neigh_tbl_lock); | |
a14a49d2 TG |
1566 | err = -EAFNOSUPPORT; |
1567 | ||
1da177e4 LT |
1568 | out_dev_put: |
1569 | if (dev) | |
1570 | dev_put(dev); | |
1571 | out: | |
1572 | return err; | |
1573 | } | |
1574 | ||
c8822a4e | 1575 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1576 | { |
3b1e0a65 | 1577 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1578 | struct ndmsg *ndm; |
1579 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1580 | struct neigh_table *tbl; |
1581 | struct net_device *dev = NULL; | |
5208debd | 1582 | int err; |
1da177e4 | 1583 | |
5208debd TG |
1584 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1585 | if (err < 0) | |
1da177e4 LT |
1586 | goto out; |
1587 | ||
5208debd TG |
1588 | err = -EINVAL; |
1589 | if (tb[NDA_DST] == NULL) | |
1590 | goto out; | |
1591 | ||
1592 | ndm = nlmsg_data(nlh); | |
1593 | if (ndm->ndm_ifindex) { | |
881d966b | 1594 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1595 | if (dev == NULL) { |
1596 | err = -ENODEV; | |
1597 | goto out; | |
1598 | } | |
1599 | ||
1600 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
1601 | goto out_dev_put; | |
1602 | } | |
1603 | ||
1da177e4 LT |
1604 | read_lock(&neigh_tbl_lock); |
1605 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
5208debd TG |
1606 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
1607 | struct neighbour *neigh; | |
1608 | void *dst, *lladdr; | |
1da177e4 LT |
1609 | |
1610 | if (tbl->family != ndm->ndm_family) | |
1611 | continue; | |
1612 | read_unlock(&neigh_tbl_lock); | |
1613 | ||
5208debd | 1614 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1da177e4 | 1615 | goto out_dev_put; |
5208debd TG |
1616 | dst = nla_data(tb[NDA_DST]); |
1617 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 LT |
1618 | |
1619 | if (ndm->ndm_flags & NTF_PROXY) { | |
62dd9318 VN |
1620 | struct pneigh_entry *pn; |
1621 | ||
1622 | err = -ENOBUFS; | |
426b5303 | 1623 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
62dd9318 VN |
1624 | if (pn) { |
1625 | pn->flags = ndm->ndm_flags; | |
1626 | err = 0; | |
1627 | } | |
1da177e4 LT |
1628 | goto out_dev_put; |
1629 | } | |
1630 | ||
5208debd | 1631 | if (dev == NULL) |
1da177e4 | 1632 | goto out_dev_put; |
5208debd TG |
1633 | |
1634 | neigh = neigh_lookup(tbl, dst, dev); | |
1635 | if (neigh == NULL) { | |
1636 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1637 | err = -ENOENT; | |
1638 | goto out_dev_put; | |
1639 | } | |
4ec93edb | 1640 | |
5208debd TG |
1641 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1642 | if (IS_ERR(neigh)) { | |
1643 | err = PTR_ERR(neigh); | |
1da177e4 LT |
1644 | goto out_dev_put; |
1645 | } | |
1da177e4 | 1646 | } else { |
5208debd TG |
1647 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1648 | err = -EEXIST; | |
1649 | neigh_release(neigh); | |
1da177e4 LT |
1650 | goto out_dev_put; |
1651 | } | |
1da177e4 | 1652 | |
5208debd TG |
1653 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1654 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1655 | } | |
1da177e4 | 1656 | |
0c5c2d30 EB |
1657 | if (ndm->ndm_flags & NTF_USE) { |
1658 | neigh_event_send(neigh, NULL); | |
1659 | err = 0; | |
1660 | } else | |
1661 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
5208debd | 1662 | neigh_release(neigh); |
1da177e4 LT |
1663 | goto out_dev_put; |
1664 | } | |
1665 | ||
1666 | read_unlock(&neigh_tbl_lock); | |
5208debd TG |
1667 | err = -EAFNOSUPPORT; |
1668 | ||
1da177e4 LT |
1669 | out_dev_put: |
1670 | if (dev) | |
1671 | dev_put(dev); | |
1672 | out: | |
1673 | return err; | |
1674 | } | |
1675 | ||
c7fb64db TG |
1676 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1677 | { | |
ca860fb3 TG |
1678 | struct nlattr *nest; |
1679 | ||
1680 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1681 | if (nest == NULL) | |
1682 | return -ENOBUFS; | |
c7fb64db TG |
1683 | |
1684 | if (parms->dev) | |
ca860fb3 TG |
1685 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
1686 | ||
1687 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); | |
1688 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); | |
1689 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); | |
1690 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); | |
1691 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); | |
1692 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); | |
1693 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); | |
1694 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, | |
c7fb64db | 1695 | parms->base_reachable_time); |
ca860fb3 TG |
1696 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
1697 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); | |
1698 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); | |
1699 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); | |
1700 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); | |
1701 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); | |
c7fb64db | 1702 | |
ca860fb3 | 1703 | return nla_nest_end(skb, nest); |
c7fb64db | 1704 | |
ca860fb3 | 1705 | nla_put_failure: |
bc3ed28c TG |
1706 | nla_nest_cancel(skb, nest); |
1707 | return -EMSGSIZE; | |
c7fb64db TG |
1708 | } |
1709 | ||
ca860fb3 TG |
1710 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1711 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1712 | { |
1713 | struct nlmsghdr *nlh; | |
1714 | struct ndtmsg *ndtmsg; | |
1715 | ||
ca860fb3 TG |
1716 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1717 | if (nlh == NULL) | |
26932566 | 1718 | return -EMSGSIZE; |
c7fb64db | 1719 | |
ca860fb3 | 1720 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1721 | |
1722 | read_lock_bh(&tbl->lock); | |
1723 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1724 | ndtmsg->ndtm_pad1 = 0; |
1725 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1726 | |
ca860fb3 TG |
1727 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
1728 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); | |
1729 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); | |
1730 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); | |
1731 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); | |
c7fb64db TG |
1732 | |
1733 | { | |
1734 | unsigned long now = jiffies; | |
1735 | unsigned int flush_delta = now - tbl->last_flush; | |
1736 | unsigned int rand_delta = now - tbl->last_rand; | |
1737 | ||
1738 | struct ndt_config ndc = { | |
1739 | .ndtc_key_len = tbl->key_len, | |
1740 | .ndtc_entry_size = tbl->entry_size, | |
1741 | .ndtc_entries = atomic_read(&tbl->entries), | |
1742 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1743 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
1744 | .ndtc_hash_rnd = tbl->hash_rnd, | |
1745 | .ndtc_hash_mask = tbl->hash_mask, | |
1746 | .ndtc_hash_chain_gc = tbl->hash_chain_gc, | |
1747 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, | |
1748 | }; | |
1749 | ||
ca860fb3 | 1750 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
c7fb64db TG |
1751 | } |
1752 | ||
1753 | { | |
1754 | int cpu; | |
1755 | struct ndt_stats ndst; | |
1756 | ||
1757 | memset(&ndst, 0, sizeof(ndst)); | |
1758 | ||
6f912042 | 1759 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1760 | struct neigh_statistics *st; |
1761 | ||
c7fb64db TG |
1762 | st = per_cpu_ptr(tbl->stats, cpu); |
1763 | ndst.ndts_allocs += st->allocs; | |
1764 | ndst.ndts_destroys += st->destroys; | |
1765 | ndst.ndts_hash_grows += st->hash_grows; | |
1766 | ndst.ndts_res_failed += st->res_failed; | |
1767 | ndst.ndts_lookups += st->lookups; | |
1768 | ndst.ndts_hits += st->hits; | |
1769 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1770 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1771 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1772 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1773 | } | |
1774 | ||
ca860fb3 | 1775 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
c7fb64db TG |
1776 | } |
1777 | ||
1778 | BUG_ON(tbl->parms.dev); | |
1779 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1780 | goto nla_put_failure; |
c7fb64db TG |
1781 | |
1782 | read_unlock_bh(&tbl->lock); | |
ca860fb3 | 1783 | return nlmsg_end(skb, nlh); |
c7fb64db | 1784 | |
ca860fb3 | 1785 | nla_put_failure: |
c7fb64db | 1786 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1787 | nlmsg_cancel(skb, nlh); |
1788 | return -EMSGSIZE; | |
c7fb64db TG |
1789 | } |
1790 | ||
ca860fb3 TG |
1791 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1792 | struct neigh_table *tbl, | |
c7fb64db | 1793 | struct neigh_parms *parms, |
ca860fb3 TG |
1794 | u32 pid, u32 seq, int type, |
1795 | unsigned int flags) | |
c7fb64db TG |
1796 | { |
1797 | struct ndtmsg *ndtmsg; | |
1798 | struct nlmsghdr *nlh; | |
1799 | ||
ca860fb3 TG |
1800 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1801 | if (nlh == NULL) | |
26932566 | 1802 | return -EMSGSIZE; |
c7fb64db | 1803 | |
ca860fb3 | 1804 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1805 | |
1806 | read_lock_bh(&tbl->lock); | |
1807 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1808 | ndtmsg->ndtm_pad1 = 0; |
1809 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1810 | |
ca860fb3 TG |
1811 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1812 | neightbl_fill_parms(skb, parms) < 0) | |
1813 | goto errout; | |
c7fb64db TG |
1814 | |
1815 | read_unlock_bh(&tbl->lock); | |
ca860fb3 TG |
1816 | return nlmsg_end(skb, nlh); |
1817 | errout: | |
c7fb64db | 1818 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1819 | nlmsg_cancel(skb, nlh); |
1820 | return -EMSGSIZE; | |
c7fb64db | 1821 | } |
4ec93edb | 1822 | |
ef7c79ed | 1823 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1824 | [NDTA_NAME] = { .type = NLA_STRING }, |
1825 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1826 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1827 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1828 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1829 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1830 | }; | |
1831 | ||
ef7c79ed | 1832 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1833 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1834 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1835 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1836 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1837 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1838 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
1839 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1840 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1841 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1842 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1843 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1844 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1845 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1846 | }; | |
1847 | ||
c8822a4e | 1848 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
c7fb64db | 1849 | { |
3b1e0a65 | 1850 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1851 | struct neigh_table *tbl; |
6b3f8674 TG |
1852 | struct ndtmsg *ndtmsg; |
1853 | struct nlattr *tb[NDTA_MAX+1]; | |
1854 | int err; | |
c7fb64db | 1855 | |
6b3f8674 TG |
1856 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1857 | nl_neightbl_policy); | |
1858 | if (err < 0) | |
1859 | goto errout; | |
c7fb64db | 1860 | |
6b3f8674 TG |
1861 | if (tb[NDTA_NAME] == NULL) { |
1862 | err = -EINVAL; | |
1863 | goto errout; | |
1864 | } | |
1865 | ||
1866 | ndtmsg = nlmsg_data(nlh); | |
c7fb64db TG |
1867 | read_lock(&neigh_tbl_lock); |
1868 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
1869 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) | |
1870 | continue; | |
1871 | ||
6b3f8674 | 1872 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
c7fb64db TG |
1873 | break; |
1874 | } | |
1875 | ||
1876 | if (tbl == NULL) { | |
1877 | err = -ENOENT; | |
6b3f8674 | 1878 | goto errout_locked; |
c7fb64db TG |
1879 | } |
1880 | ||
4ec93edb | 1881 | /* |
c7fb64db TG |
1882 | * We acquire tbl->lock to be nice to the periodic timers and |
1883 | * make sure they always see a consistent set of values. | |
1884 | */ | |
1885 | write_lock_bh(&tbl->lock); | |
1886 | ||
6b3f8674 TG |
1887 | if (tb[NDTA_PARMS]) { |
1888 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1889 | struct neigh_parms *p; |
6b3f8674 | 1890 | int i, ifindex = 0; |
c7fb64db | 1891 | |
6b3f8674 TG |
1892 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1893 | nl_ntbl_parm_policy); | |
1894 | if (err < 0) | |
1895 | goto errout_tbl_lock; | |
c7fb64db | 1896 | |
6b3f8674 TG |
1897 | if (tbp[NDTPA_IFINDEX]) |
1898 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1899 | |
426b5303 | 1900 | p = lookup_neigh_params(tbl, net, ifindex); |
c7fb64db TG |
1901 | if (p == NULL) { |
1902 | err = -ENOENT; | |
6b3f8674 | 1903 | goto errout_tbl_lock; |
c7fb64db | 1904 | } |
c7fb64db | 1905 | |
6b3f8674 TG |
1906 | for (i = 1; i <= NDTPA_MAX; i++) { |
1907 | if (tbp[i] == NULL) | |
1908 | continue; | |
c7fb64db | 1909 | |
6b3f8674 TG |
1910 | switch (i) { |
1911 | case NDTPA_QUEUE_LEN: | |
1912 | p->queue_len = nla_get_u32(tbp[i]); | |
1913 | break; | |
1914 | case NDTPA_PROXY_QLEN: | |
1915 | p->proxy_qlen = nla_get_u32(tbp[i]); | |
1916 | break; | |
1917 | case NDTPA_APP_PROBES: | |
1918 | p->app_probes = nla_get_u32(tbp[i]); | |
1919 | break; | |
1920 | case NDTPA_UCAST_PROBES: | |
1921 | p->ucast_probes = nla_get_u32(tbp[i]); | |
1922 | break; | |
1923 | case NDTPA_MCAST_PROBES: | |
1924 | p->mcast_probes = nla_get_u32(tbp[i]); | |
1925 | break; | |
1926 | case NDTPA_BASE_REACHABLE_TIME: | |
1927 | p->base_reachable_time = nla_get_msecs(tbp[i]); | |
1928 | break; | |
1929 | case NDTPA_GC_STALETIME: | |
1930 | p->gc_staletime = nla_get_msecs(tbp[i]); | |
1931 | break; | |
1932 | case NDTPA_DELAY_PROBE_TIME: | |
1933 | p->delay_probe_time = nla_get_msecs(tbp[i]); | |
1934 | break; | |
1935 | case NDTPA_RETRANS_TIME: | |
1936 | p->retrans_time = nla_get_msecs(tbp[i]); | |
1937 | break; | |
1938 | case NDTPA_ANYCAST_DELAY: | |
1939 | p->anycast_delay = nla_get_msecs(tbp[i]); | |
1940 | break; | |
1941 | case NDTPA_PROXY_DELAY: | |
1942 | p->proxy_delay = nla_get_msecs(tbp[i]); | |
1943 | break; | |
1944 | case NDTPA_LOCKTIME: | |
1945 | p->locktime = nla_get_msecs(tbp[i]); | |
1946 | break; | |
1947 | } | |
1948 | } | |
1949 | } | |
c7fb64db | 1950 | |
6b3f8674 TG |
1951 | if (tb[NDTA_THRESH1]) |
1952 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 1953 | |
6b3f8674 TG |
1954 | if (tb[NDTA_THRESH2]) |
1955 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 1956 | |
6b3f8674 TG |
1957 | if (tb[NDTA_THRESH3]) |
1958 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 1959 | |
6b3f8674 TG |
1960 | if (tb[NDTA_GC_INTERVAL]) |
1961 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
1962 | |
1963 | err = 0; | |
1964 | ||
6b3f8674 | 1965 | errout_tbl_lock: |
c7fb64db | 1966 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 1967 | errout_locked: |
c7fb64db | 1968 | read_unlock(&neigh_tbl_lock); |
6b3f8674 | 1969 | errout: |
c7fb64db TG |
1970 | return err; |
1971 | } | |
1972 | ||
c8822a4e | 1973 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 1974 | { |
3b1e0a65 | 1975 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
1976 | int family, tidx, nidx = 0; |
1977 | int tbl_skip = cb->args[0]; | |
1978 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
1979 | struct neigh_table *tbl; |
1980 | ||
ca860fb3 | 1981 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db TG |
1982 | |
1983 | read_lock(&neigh_tbl_lock); | |
ca860fb3 | 1984 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
c7fb64db TG |
1985 | struct neigh_parms *p; |
1986 | ||
ca860fb3 | 1987 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
1988 | continue; |
1989 | ||
ca860fb3 TG |
1990 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
1991 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, | |
1992 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
1993 | break; |
1994 | ||
426b5303 | 1995 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
878628fb | 1996 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
1997 | continue; |
1998 | ||
efc683fc GK |
1999 | if (nidx < neigh_skip) |
2000 | goto next; | |
c7fb64db | 2001 | |
ca860fb3 TG |
2002 | if (neightbl_fill_param_info(skb, tbl, p, |
2003 | NETLINK_CB(cb->skb).pid, | |
2004 | cb->nlh->nlmsg_seq, | |
2005 | RTM_NEWNEIGHTBL, | |
2006 | NLM_F_MULTI) <= 0) | |
c7fb64db | 2007 | goto out; |
efc683fc GK |
2008 | next: |
2009 | nidx++; | |
c7fb64db TG |
2010 | } |
2011 | ||
ca860fb3 | 2012 | neigh_skip = 0; |
c7fb64db TG |
2013 | } |
2014 | out: | |
2015 | read_unlock(&neigh_tbl_lock); | |
ca860fb3 TG |
2016 | cb->args[0] = tidx; |
2017 | cb->args[1] = nidx; | |
c7fb64db TG |
2018 | |
2019 | return skb->len; | |
2020 | } | |
1da177e4 | 2021 | |
8b8aec50 TG |
2022 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2023 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2024 | { |
2025 | unsigned long now = jiffies; | |
1da177e4 | 2026 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2027 | struct nlmsghdr *nlh; |
2028 | struct ndmsg *ndm; | |
2029 | ||
2030 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2031 | if (nlh == NULL) | |
26932566 | 2032 | return -EMSGSIZE; |
1da177e4 | 2033 | |
8b8aec50 TG |
2034 | ndm = nlmsg_data(nlh); |
2035 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2036 | ndm->ndm_pad1 = 0; |
2037 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2038 | ndm->ndm_flags = neigh->flags; |
2039 | ndm->ndm_type = neigh->type; | |
2040 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2041 | |
8b8aec50 TG |
2042 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
2043 | ||
2044 | read_lock_bh(&neigh->lock); | |
2045 | ndm->ndm_state = neigh->nud_state; | |
2046 | if ((neigh->nud_state & NUD_VALID) && | |
2047 | nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, neigh->ha) < 0) { | |
2048 | read_unlock_bh(&neigh->lock); | |
2049 | goto nla_put_failure; | |
2050 | } | |
2051 | ||
b9f5f52c SH |
2052 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2053 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2054 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2055 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2056 | read_unlock_bh(&neigh->lock); | |
2057 | ||
2058 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); | |
2059 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); | |
2060 | ||
2061 | return nlmsg_end(skb, nlh); | |
2062 | ||
2063 | nla_put_failure: | |
26932566 PM |
2064 | nlmsg_cancel(skb, nlh); |
2065 | return -EMSGSIZE; | |
1da177e4 LT |
2066 | } |
2067 | ||
d961db35 TG |
2068 | static void neigh_update_notify(struct neighbour *neigh) |
2069 | { | |
2070 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2071 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2072 | } | |
1da177e4 LT |
2073 | |
2074 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2075 | struct netlink_callback *cb) | |
2076 | { | |
3b1e0a65 | 2077 | struct net * net = sock_net(skb->sk); |
1da177e4 LT |
2078 | struct neighbour *n; |
2079 | int rc, h, s_h = cb->args[1]; | |
2080 | int idx, s_idx = idx = cb->args[2]; | |
2081 | ||
c5e29460 | 2082 | read_lock_bh(&tbl->lock); |
1da177e4 LT |
2083 | for (h = 0; h <= tbl->hash_mask; h++) { |
2084 | if (h < s_h) | |
2085 | continue; | |
2086 | if (h > s_h) | |
2087 | s_idx = 0; | |
426b5303 | 2088 | for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next) { |
c346dca1 | 2089 | if (dev_net(n->dev) != net) |
426b5303 | 2090 | continue; |
efc683fc GK |
2091 | if (idx < s_idx) |
2092 | goto next; | |
1da177e4 LT |
2093 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, |
2094 | cb->nlh->nlmsg_seq, | |
b6544c0b JHS |
2095 | RTM_NEWNEIGH, |
2096 | NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2097 | read_unlock_bh(&tbl->lock); |
2098 | rc = -1; | |
2099 | goto out; | |
2100 | } | |
efc683fc GK |
2101 | next: |
2102 | idx++; | |
1da177e4 | 2103 | } |
1da177e4 | 2104 | } |
c5e29460 | 2105 | read_unlock_bh(&tbl->lock); |
1da177e4 LT |
2106 | rc = skb->len; |
2107 | out: | |
2108 | cb->args[1] = h; | |
2109 | cb->args[2] = idx; | |
2110 | return rc; | |
2111 | } | |
2112 | ||
c8822a4e | 2113 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2114 | { |
2115 | struct neigh_table *tbl; | |
2116 | int t, family, s_t; | |
2117 | ||
2118 | read_lock(&neigh_tbl_lock); | |
8b8aec50 | 2119 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
1da177e4 LT |
2120 | s_t = cb->args[0]; |
2121 | ||
2122 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { | |
2123 | if (t < s_t || (family && tbl->family != family)) | |
2124 | continue; | |
2125 | if (t > s_t) | |
2126 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2127 | sizeof(cb->args[0])); | |
2128 | if (neigh_dump_table(tbl, skb, cb) < 0) | |
2129 | break; | |
2130 | } | |
2131 | read_unlock(&neigh_tbl_lock); | |
2132 | ||
2133 | cb->args[0] = t; | |
2134 | return skb->len; | |
2135 | } | |
2136 | ||
2137 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2138 | { | |
2139 | int chain; | |
2140 | ||
2141 | read_lock_bh(&tbl->lock); | |
2142 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2143 | struct neighbour *n; | |
2144 | ||
2145 | for (n = tbl->hash_buckets[chain]; n; n = n->next) | |
2146 | cb(n, cookie); | |
2147 | } | |
2148 | read_unlock_bh(&tbl->lock); | |
2149 | } | |
2150 | EXPORT_SYMBOL(neigh_for_each); | |
2151 | ||
2152 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2153 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2154 | int (*cb)(struct neighbour *)) | |
2155 | { | |
2156 | int chain; | |
2157 | ||
2158 | for (chain = 0; chain <= tbl->hash_mask; chain++) { | |
2159 | struct neighbour *n, **np; | |
2160 | ||
2161 | np = &tbl->hash_buckets[chain]; | |
2162 | while ((n = *np) != NULL) { | |
2163 | int release; | |
2164 | ||
2165 | write_lock(&n->lock); | |
2166 | release = cb(n); | |
2167 | if (release) { | |
2168 | *np = n->next; | |
2169 | n->dead = 1; | |
2170 | } else | |
2171 | np = &n->next; | |
2172 | write_unlock(&n->lock); | |
4f494554 TG |
2173 | if (release) |
2174 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2175 | } |
2176 | } | |
2177 | } | |
2178 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2179 | ||
2180 | #ifdef CONFIG_PROC_FS | |
2181 | ||
2182 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2183 | { | |
2184 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2185 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2186 | struct neigh_table *tbl = state->tbl; |
2187 | struct neighbour *n = NULL; | |
2188 | int bucket = state->bucket; | |
2189 | ||
2190 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
2191 | for (bucket = 0; bucket <= tbl->hash_mask; bucket++) { | |
2192 | n = tbl->hash_buckets[bucket]; | |
2193 | ||
2194 | while (n) { | |
878628fb | 2195 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2196 | goto next; |
1da177e4 LT |
2197 | if (state->neigh_sub_iter) { |
2198 | loff_t fakep = 0; | |
2199 | void *v; | |
2200 | ||
2201 | v = state->neigh_sub_iter(state, n, &fakep); | |
2202 | if (!v) | |
2203 | goto next; | |
2204 | } | |
2205 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2206 | break; | |
2207 | if (n->nud_state & ~NUD_NOARP) | |
2208 | break; | |
2209 | next: | |
2210 | n = n->next; | |
2211 | } | |
2212 | ||
2213 | if (n) | |
2214 | break; | |
2215 | } | |
2216 | state->bucket = bucket; | |
2217 | ||
2218 | return n; | |
2219 | } | |
2220 | ||
2221 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2222 | struct neighbour *n, | |
2223 | loff_t *pos) | |
2224 | { | |
2225 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2226 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2227 | struct neigh_table *tbl = state->tbl; |
2228 | ||
2229 | if (state->neigh_sub_iter) { | |
2230 | void *v = state->neigh_sub_iter(state, n, pos); | |
2231 | if (v) | |
2232 | return n; | |
2233 | } | |
2234 | n = n->next; | |
2235 | ||
2236 | while (1) { | |
2237 | while (n) { | |
878628fb | 2238 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2239 | goto next; |
1da177e4 LT |
2240 | if (state->neigh_sub_iter) { |
2241 | void *v = state->neigh_sub_iter(state, n, pos); | |
2242 | if (v) | |
2243 | return n; | |
2244 | goto next; | |
2245 | } | |
2246 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2247 | break; | |
2248 | ||
2249 | if (n->nud_state & ~NUD_NOARP) | |
2250 | break; | |
2251 | next: | |
2252 | n = n->next; | |
2253 | } | |
2254 | ||
2255 | if (n) | |
2256 | break; | |
2257 | ||
2258 | if (++state->bucket > tbl->hash_mask) | |
2259 | break; | |
2260 | ||
2261 | n = tbl->hash_buckets[state->bucket]; | |
2262 | } | |
2263 | ||
2264 | if (n && pos) | |
2265 | --(*pos); | |
2266 | return n; | |
2267 | } | |
2268 | ||
2269 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2270 | { | |
2271 | struct neighbour *n = neigh_get_first(seq); | |
2272 | ||
2273 | if (n) { | |
745e2031 | 2274 | --(*pos); |
1da177e4 LT |
2275 | while (*pos) { |
2276 | n = neigh_get_next(seq, n, pos); | |
2277 | if (!n) | |
2278 | break; | |
2279 | } | |
2280 | } | |
2281 | return *pos ? NULL : n; | |
2282 | } | |
2283 | ||
2284 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2285 | { | |
2286 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2287 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2288 | struct neigh_table *tbl = state->tbl; |
2289 | struct pneigh_entry *pn = NULL; | |
2290 | int bucket = state->bucket; | |
2291 | ||
2292 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2293 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2294 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2295 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2296 | pn = pn->next; |
1da177e4 LT |
2297 | if (pn) |
2298 | break; | |
2299 | } | |
2300 | state->bucket = bucket; | |
2301 | ||
2302 | return pn; | |
2303 | } | |
2304 | ||
2305 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2306 | struct pneigh_entry *pn, | |
2307 | loff_t *pos) | |
2308 | { | |
2309 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2310 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2311 | struct neigh_table *tbl = state->tbl; |
2312 | ||
2313 | pn = pn->next; | |
2314 | while (!pn) { | |
2315 | if (++state->bucket > PNEIGH_HASHMASK) | |
2316 | break; | |
2317 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2318 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2319 | pn = pn->next; |
1da177e4 LT |
2320 | if (pn) |
2321 | break; | |
2322 | } | |
2323 | ||
2324 | if (pn && pos) | |
2325 | --(*pos); | |
2326 | ||
2327 | return pn; | |
2328 | } | |
2329 | ||
2330 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2331 | { | |
2332 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2333 | ||
2334 | if (pn) { | |
745e2031 | 2335 | --(*pos); |
1da177e4 LT |
2336 | while (*pos) { |
2337 | pn = pneigh_get_next(seq, pn, pos); | |
2338 | if (!pn) | |
2339 | break; | |
2340 | } | |
2341 | } | |
2342 | return *pos ? NULL : pn; | |
2343 | } | |
2344 | ||
2345 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2346 | { | |
2347 | struct neigh_seq_state *state = seq->private; | |
2348 | void *rc; | |
745e2031 | 2349 | loff_t idxpos = *pos; |
1da177e4 | 2350 | |
745e2031 | 2351 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2352 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2353 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2354 | |
2355 | return rc; | |
2356 | } | |
2357 | ||
2358 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
9a429c49 | 2359 | __acquires(tbl->lock) |
1da177e4 LT |
2360 | { |
2361 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2362 | |
2363 | state->tbl = tbl; | |
2364 | state->bucket = 0; | |
2365 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2366 | ||
2367 | read_lock_bh(&tbl->lock); | |
2368 | ||
745e2031 | 2369 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2370 | } |
2371 | EXPORT_SYMBOL(neigh_seq_start); | |
2372 | ||
2373 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2374 | { | |
2375 | struct neigh_seq_state *state; | |
2376 | void *rc; | |
2377 | ||
2378 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2379 | rc = neigh_get_first(seq); |
1da177e4 LT |
2380 | goto out; |
2381 | } | |
2382 | ||
2383 | state = seq->private; | |
2384 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2385 | rc = neigh_get_next(seq, v, NULL); | |
2386 | if (rc) | |
2387 | goto out; | |
2388 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2389 | rc = pneigh_get_first(seq); | |
2390 | } else { | |
2391 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2392 | rc = pneigh_get_next(seq, v, NULL); | |
2393 | } | |
2394 | out: | |
2395 | ++(*pos); | |
2396 | return rc; | |
2397 | } | |
2398 | EXPORT_SYMBOL(neigh_seq_next); | |
2399 | ||
2400 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2401 | __releases(tbl->lock) |
1da177e4 LT |
2402 | { |
2403 | struct neigh_seq_state *state = seq->private; | |
2404 | struct neigh_table *tbl = state->tbl; | |
2405 | ||
2406 | read_unlock_bh(&tbl->lock); | |
2407 | } | |
2408 | EXPORT_SYMBOL(neigh_seq_stop); | |
2409 | ||
2410 | /* statistics via seq_file */ | |
2411 | ||
2412 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2413 | { | |
2414 | struct proc_dir_entry *pde = seq->private; | |
2415 | struct neigh_table *tbl = pde->data; | |
2416 | int cpu; | |
2417 | ||
2418 | if (*pos == 0) | |
2419 | return SEQ_START_TOKEN; | |
4ec93edb | 2420 | |
0f23174a | 2421 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2422 | if (!cpu_possible(cpu)) |
2423 | continue; | |
2424 | *pos = cpu+1; | |
2425 | return per_cpu_ptr(tbl->stats, cpu); | |
2426 | } | |
2427 | return NULL; | |
2428 | } | |
2429 | ||
2430 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2431 | { | |
2432 | struct proc_dir_entry *pde = seq->private; | |
2433 | struct neigh_table *tbl = pde->data; | |
2434 | int cpu; | |
2435 | ||
0f23174a | 2436 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2437 | if (!cpu_possible(cpu)) |
2438 | continue; | |
2439 | *pos = cpu+1; | |
2440 | return per_cpu_ptr(tbl->stats, cpu); | |
2441 | } | |
2442 | return NULL; | |
2443 | } | |
2444 | ||
2445 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2446 | { | |
2447 | ||
2448 | } | |
2449 | ||
2450 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2451 | { | |
2452 | struct proc_dir_entry *pde = seq->private; | |
2453 | struct neigh_table *tbl = pde->data; | |
2454 | struct neigh_statistics *st = v; | |
2455 | ||
2456 | if (v == SEQ_START_TOKEN) { | |
9a6d276e | 2457 | 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 |
2458 | return 0; |
2459 | } | |
2460 | ||
2461 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
9a6d276e | 2462 | "%08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2463 | atomic_read(&tbl->entries), |
2464 | ||
2465 | st->allocs, | |
2466 | st->destroys, | |
2467 | st->hash_grows, | |
2468 | ||
2469 | st->lookups, | |
2470 | st->hits, | |
2471 | ||
2472 | st->res_failed, | |
2473 | ||
2474 | st->rcv_probes_mcast, | |
2475 | st->rcv_probes_ucast, | |
2476 | ||
2477 | st->periodic_gc_runs, | |
9a6d276e NH |
2478 | st->forced_gc_runs, |
2479 | st->unres_discards | |
1da177e4 LT |
2480 | ); |
2481 | ||
2482 | return 0; | |
2483 | } | |
2484 | ||
f690808e | 2485 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2486 | .start = neigh_stat_seq_start, |
2487 | .next = neigh_stat_seq_next, | |
2488 | .stop = neigh_stat_seq_stop, | |
2489 | .show = neigh_stat_seq_show, | |
2490 | }; | |
2491 | ||
2492 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2493 | { | |
2494 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2495 | ||
2496 | if (!ret) { | |
2497 | struct seq_file *sf = file->private_data; | |
2498 | sf->private = PDE(inode); | |
2499 | } | |
2500 | return ret; | |
2501 | }; | |
2502 | ||
9a32144e | 2503 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2504 | .owner = THIS_MODULE, |
2505 | .open = neigh_stat_seq_open, | |
2506 | .read = seq_read, | |
2507 | .llseek = seq_lseek, | |
2508 | .release = seq_release, | |
2509 | }; | |
2510 | ||
2511 | #endif /* CONFIG_PROC_FS */ | |
2512 | ||
339bf98f TG |
2513 | static inline size_t neigh_nlmsg_size(void) |
2514 | { | |
2515 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2516 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2517 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2518 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2519 | + nla_total_size(4); /* NDA_PROBES */ | |
2520 | } | |
2521 | ||
b8673311 | 2522 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2523 | { |
c346dca1 | 2524 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2525 | struct sk_buff *skb; |
b8673311 | 2526 | int err = -ENOBUFS; |
1da177e4 | 2527 | |
339bf98f | 2528 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2529 | if (skb == NULL) |
b8673311 | 2530 | goto errout; |
1da177e4 | 2531 | |
b8673311 | 2532 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2533 | if (err < 0) { |
2534 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2535 | WARN_ON(err == -EMSGSIZE); | |
2536 | kfree_skb(skb); | |
2537 | goto errout; | |
2538 | } | |
1ce85fe4 PNA |
2539 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2540 | return; | |
b8673311 TG |
2541 | errout: |
2542 | if (err < 0) | |
426b5303 | 2543 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2544 | } |
2545 | ||
d961db35 | 2546 | #ifdef CONFIG_ARPD |
b8673311 | 2547 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2548 | { |
b8673311 TG |
2549 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2550 | } | |
0a204500 | 2551 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2552 | #endif /* CONFIG_ARPD */ |
2553 | ||
2554 | #ifdef CONFIG_SYSCTL | |
2555 | ||
2556 | static struct neigh_sysctl_table { | |
2557 | struct ctl_table_header *sysctl_header; | |
c3bac5a7 PE |
2558 | struct ctl_table neigh_vars[__NET_NEIGH_MAX]; |
2559 | char *dev_name; | |
ab32ea5d | 2560 | } neigh_sysctl_template __read_mostly = { |
1da177e4 LT |
2561 | .neigh_vars = { |
2562 | { | |
2563 | .ctl_name = NET_NEIGH_MCAST_SOLICIT, | |
2564 | .procname = "mcast_solicit", | |
2565 | .maxlen = sizeof(int), | |
2566 | .mode = 0644, | |
6d9f239a | 2567 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2568 | }, |
2569 | { | |
2570 | .ctl_name = NET_NEIGH_UCAST_SOLICIT, | |
2571 | .procname = "ucast_solicit", | |
2572 | .maxlen = sizeof(int), | |
2573 | .mode = 0644, | |
6d9f239a | 2574 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2575 | }, |
2576 | { | |
2577 | .ctl_name = NET_NEIGH_APP_SOLICIT, | |
2578 | .procname = "app_solicit", | |
2579 | .maxlen = sizeof(int), | |
2580 | .mode = 0644, | |
6d9f239a | 2581 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2582 | }, |
2583 | { | |
1da177e4 LT |
2584 | .procname = "retrans_time", |
2585 | .maxlen = sizeof(int), | |
2586 | .mode = 0644, | |
6d9f239a | 2587 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2588 | }, |
2589 | { | |
2590 | .ctl_name = NET_NEIGH_REACHABLE_TIME, | |
2591 | .procname = "base_reachable_time", | |
2592 | .maxlen = sizeof(int), | |
2593 | .mode = 0644, | |
6d9f239a AD |
2594 | .proc_handler = proc_dointvec_jiffies, |
2595 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2596 | }, |
2597 | { | |
2598 | .ctl_name = NET_NEIGH_DELAY_PROBE_TIME, | |
2599 | .procname = "delay_first_probe_time", | |
2600 | .maxlen = sizeof(int), | |
2601 | .mode = 0644, | |
6d9f239a AD |
2602 | .proc_handler = proc_dointvec_jiffies, |
2603 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2604 | }, |
2605 | { | |
2606 | .ctl_name = NET_NEIGH_GC_STALE_TIME, | |
2607 | .procname = "gc_stale_time", | |
2608 | .maxlen = sizeof(int), | |
2609 | .mode = 0644, | |
6d9f239a AD |
2610 | .proc_handler = proc_dointvec_jiffies, |
2611 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2612 | }, |
2613 | { | |
2614 | .ctl_name = NET_NEIGH_UNRES_QLEN, | |
2615 | .procname = "unres_qlen", | |
2616 | .maxlen = sizeof(int), | |
2617 | .mode = 0644, | |
6d9f239a | 2618 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2619 | }, |
2620 | { | |
2621 | .ctl_name = NET_NEIGH_PROXY_QLEN, | |
2622 | .procname = "proxy_qlen", | |
2623 | .maxlen = sizeof(int), | |
2624 | .mode = 0644, | |
6d9f239a | 2625 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2626 | }, |
2627 | { | |
1da177e4 LT |
2628 | .procname = "anycast_delay", |
2629 | .maxlen = sizeof(int), | |
2630 | .mode = 0644, | |
6d9f239a | 2631 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2632 | }, |
2633 | { | |
1da177e4 LT |
2634 | .procname = "proxy_delay", |
2635 | .maxlen = sizeof(int), | |
2636 | .mode = 0644, | |
6d9f239a | 2637 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2638 | }, |
2639 | { | |
1da177e4 LT |
2640 | .procname = "locktime", |
2641 | .maxlen = sizeof(int), | |
2642 | .mode = 0644, | |
6d9f239a | 2643 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 | 2644 | }, |
d12af679 EB |
2645 | { |
2646 | .ctl_name = NET_NEIGH_RETRANS_TIME_MS, | |
2647 | .procname = "retrans_time_ms", | |
2648 | .maxlen = sizeof(int), | |
2649 | .mode = 0644, | |
6d9f239a AD |
2650 | .proc_handler = proc_dointvec_ms_jiffies, |
2651 | .strategy = sysctl_ms_jiffies, | |
d12af679 EB |
2652 | }, |
2653 | { | |
2654 | .ctl_name = NET_NEIGH_REACHABLE_TIME_MS, | |
2655 | .procname = "base_reachable_time_ms", | |
2656 | .maxlen = sizeof(int), | |
2657 | .mode = 0644, | |
6d9f239a AD |
2658 | .proc_handler = proc_dointvec_ms_jiffies, |
2659 | .strategy = sysctl_ms_jiffies, | |
d12af679 | 2660 | }, |
1da177e4 LT |
2661 | { |
2662 | .ctl_name = NET_NEIGH_GC_INTERVAL, | |
2663 | .procname = "gc_interval", | |
2664 | .maxlen = sizeof(int), | |
2665 | .mode = 0644, | |
6d9f239a AD |
2666 | .proc_handler = proc_dointvec_jiffies, |
2667 | .strategy = sysctl_jiffies, | |
1da177e4 LT |
2668 | }, |
2669 | { | |
2670 | .ctl_name = NET_NEIGH_GC_THRESH1, | |
2671 | .procname = "gc_thresh1", | |
2672 | .maxlen = sizeof(int), | |
2673 | .mode = 0644, | |
6d9f239a | 2674 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2675 | }, |
2676 | { | |
2677 | .ctl_name = NET_NEIGH_GC_THRESH2, | |
2678 | .procname = "gc_thresh2", | |
2679 | .maxlen = sizeof(int), | |
2680 | .mode = 0644, | |
6d9f239a | 2681 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2682 | }, |
2683 | { | |
2684 | .ctl_name = NET_NEIGH_GC_THRESH3, | |
2685 | .procname = "gc_thresh3", | |
2686 | .maxlen = sizeof(int), | |
2687 | .mode = 0644, | |
6d9f239a | 2688 | .proc_handler = proc_dointvec, |
1da177e4 | 2689 | }, |
c3bac5a7 | 2690 | {}, |
1da177e4 LT |
2691 | }, |
2692 | }; | |
2693 | ||
2694 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
4ec93edb | 2695 | int p_id, int pdev_id, char *p_name, |
1da177e4 LT |
2696 | proc_handler *handler, ctl_handler *strategy) |
2697 | { | |
3c607bbb | 2698 | struct neigh_sysctl_table *t; |
1da177e4 | 2699 | const char *dev_name_source = NULL; |
c3bac5a7 PE |
2700 | |
2701 | #define NEIGH_CTL_PATH_ROOT 0 | |
2702 | #define NEIGH_CTL_PATH_PROTO 1 | |
2703 | #define NEIGH_CTL_PATH_NEIGH 2 | |
2704 | #define NEIGH_CTL_PATH_DEV 3 | |
2705 | ||
2706 | struct ctl_path neigh_path[] = { | |
2707 | { .procname = "net", .ctl_name = CTL_NET, }, | |
2708 | { .procname = "proto", .ctl_name = 0, }, | |
2709 | { .procname = "neigh", .ctl_name = 0, }, | |
2710 | { .procname = "default", .ctl_name = NET_PROTO_CONF_DEFAULT, }, | |
2711 | { }, | |
2712 | }; | |
1da177e4 | 2713 | |
3c607bbb | 2714 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2715 | if (!t) |
3c607bbb PE |
2716 | goto err; |
2717 | ||
1da177e4 LT |
2718 | t->neigh_vars[0].data = &p->mcast_probes; |
2719 | t->neigh_vars[1].data = &p->ucast_probes; | |
2720 | t->neigh_vars[2].data = &p->app_probes; | |
2721 | t->neigh_vars[3].data = &p->retrans_time; | |
2722 | t->neigh_vars[4].data = &p->base_reachable_time; | |
2723 | t->neigh_vars[5].data = &p->delay_probe_time; | |
2724 | t->neigh_vars[6].data = &p->gc_staletime; | |
2725 | t->neigh_vars[7].data = &p->queue_len; | |
2726 | t->neigh_vars[8].data = &p->proxy_qlen; | |
2727 | t->neigh_vars[9].data = &p->anycast_delay; | |
2728 | t->neigh_vars[10].data = &p->proxy_delay; | |
2729 | t->neigh_vars[11].data = &p->locktime; | |
d12af679 EB |
2730 | t->neigh_vars[12].data = &p->retrans_time; |
2731 | t->neigh_vars[13].data = &p->base_reachable_time; | |
1da177e4 LT |
2732 | |
2733 | if (dev) { | |
2734 | dev_name_source = dev->name; | |
c3bac5a7 | 2735 | neigh_path[NEIGH_CTL_PATH_DEV].ctl_name = dev->ifindex; |
d12af679 EB |
2736 | /* Terminate the table early */ |
2737 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); | |
1da177e4 | 2738 | } else { |
c3bac5a7 | 2739 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
d12af679 EB |
2740 | t->neigh_vars[14].data = (int *)(p + 1); |
2741 | t->neigh_vars[15].data = (int *)(p + 1) + 1; | |
2742 | t->neigh_vars[16].data = (int *)(p + 1) + 2; | |
2743 | t->neigh_vars[17].data = (int *)(p + 1) + 3; | |
1da177e4 LT |
2744 | } |
2745 | ||
1da177e4 LT |
2746 | |
2747 | if (handler || strategy) { | |
2748 | /* RetransTime */ | |
2749 | t->neigh_vars[3].proc_handler = handler; | |
2750 | t->neigh_vars[3].strategy = strategy; | |
2751 | t->neigh_vars[3].extra1 = dev; | |
d12af679 EB |
2752 | if (!strategy) |
2753 | t->neigh_vars[3].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2754 | /* ReachableTime */ |
2755 | t->neigh_vars[4].proc_handler = handler; | |
2756 | t->neigh_vars[4].strategy = strategy; | |
2757 | t->neigh_vars[4].extra1 = dev; | |
d12af679 EB |
2758 | if (!strategy) |
2759 | t->neigh_vars[4].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2760 | /* RetransTime (in milliseconds)*/ |
d12af679 EB |
2761 | t->neigh_vars[12].proc_handler = handler; |
2762 | t->neigh_vars[12].strategy = strategy; | |
2763 | t->neigh_vars[12].extra1 = dev; | |
2764 | if (!strategy) | |
2765 | t->neigh_vars[12].ctl_name = CTL_UNNUMBERED; | |
1da177e4 | 2766 | /* ReachableTime (in milliseconds) */ |
d12af679 EB |
2767 | t->neigh_vars[13].proc_handler = handler; |
2768 | t->neigh_vars[13].strategy = strategy; | |
2769 | t->neigh_vars[13].extra1 = dev; | |
2770 | if (!strategy) | |
2771 | t->neigh_vars[13].ctl_name = CTL_UNNUMBERED; | |
1da177e4 LT |
2772 | } |
2773 | ||
c3bac5a7 PE |
2774 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
2775 | if (!t->dev_name) | |
1da177e4 | 2776 | goto free; |
1da177e4 | 2777 | |
c3bac5a7 PE |
2778 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
2779 | neigh_path[NEIGH_CTL_PATH_NEIGH].ctl_name = pdev_id; | |
2780 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; | |
2781 | neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id; | |
1da177e4 | 2782 | |
4ab438fc | 2783 | t->sysctl_header = |
57da52c1 | 2784 | register_net_sysctl_table(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 2785 | if (!t->sysctl_header) |
1da177e4 | 2786 | goto free_procname; |
3c607bbb | 2787 | |
1da177e4 LT |
2788 | p->sysctl_table = t; |
2789 | return 0; | |
2790 | ||
3c607bbb | 2791 | free_procname: |
c3bac5a7 | 2792 | kfree(t->dev_name); |
3c607bbb | 2793 | free: |
1da177e4 | 2794 | kfree(t); |
3c607bbb PE |
2795 | err: |
2796 | return -ENOBUFS; | |
1da177e4 | 2797 | } |
0a204500 | 2798 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
2799 | |
2800 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
2801 | { | |
2802 | if (p->sysctl_table) { | |
2803 | struct neigh_sysctl_table *t = p->sysctl_table; | |
2804 | p->sysctl_table = NULL; | |
2805 | unregister_sysctl_table(t->sysctl_header); | |
c3bac5a7 | 2806 | kfree(t->dev_name); |
1da177e4 LT |
2807 | kfree(t); |
2808 | } | |
2809 | } | |
0a204500 | 2810 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
2811 | |
2812 | #endif /* CONFIG_SYSCTL */ | |
2813 | ||
c8822a4e TG |
2814 | static int __init neigh_init(void) |
2815 | { | |
2816 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL); | |
2817 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL); | |
2818 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info); | |
2819 | ||
2820 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info); | |
2821 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL); | |
2822 | ||
2823 | return 0; | |
2824 | } | |
2825 | ||
2826 | subsys_initcall(neigh_init); | |
2827 |