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 | ||
5a0e3ad6 | 18 | #include <linux/slab.h> |
1da177e4 LT |
19 | #include <linux/types.h> |
20 | #include <linux/kernel.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/socket.h> | |
1da177e4 LT |
23 | #include <linux/netdevice.h> |
24 | #include <linux/proc_fs.h> | |
25 | #ifdef CONFIG_SYSCTL | |
26 | #include <linux/sysctl.h> | |
27 | #endif | |
28 | #include <linux/times.h> | |
457c4cbc | 29 | #include <net/net_namespace.h> |
1da177e4 LT |
30 | #include <net/neighbour.h> |
31 | #include <net/dst.h> | |
32 | #include <net/sock.h> | |
8d71740c | 33 | #include <net/netevent.h> |
a14a49d2 | 34 | #include <net/netlink.h> |
1da177e4 LT |
35 | #include <linux/rtnetlink.h> |
36 | #include <linux/random.h> | |
543537bd | 37 | #include <linux/string.h> |
c3609d51 | 38 | #include <linux/log2.h> |
1da177e4 LT |
39 | |
40 | #define NEIGH_DEBUG 1 | |
41 | ||
42 | #define NEIGH_PRINTK(x...) printk(x) | |
43 | #define NEIGH_NOPRINTK(x...) do { ; } while(0) | |
1da177e4 LT |
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 | { | |
a02cec21 | 124 | return base ? (net_random() % base) + (base >> 1) : 0; |
1da177e4 | 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; | |
d6bf7817 | 133 | struct neigh_hash_table *nht; |
1da177e4 LT |
134 | |
135 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
136 | ||
137 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
138 | nht = rcu_dereference_protected(tbl->nht, |
139 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 140 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
141 | struct neighbour *n; |
142 | struct neighbour __rcu **np; | |
1da177e4 | 143 | |
d6bf7817 | 144 | np = &nht->hash_buckets[i]; |
767e97e1 ED |
145 | while ((n = rcu_dereference_protected(*np, |
146 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
147 | /* Neighbour record may be discarded if: |
148 | * - nobody refers to it. | |
149 | * - it is not permanent | |
150 | */ | |
151 | write_lock(&n->lock); | |
152 | if (atomic_read(&n->refcnt) == 1 && | |
153 | !(n->nud_state & NUD_PERMANENT)) { | |
767e97e1 ED |
154 | rcu_assign_pointer(*np, |
155 | rcu_dereference_protected(n->next, | |
156 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
157 | n->dead = 1; |
158 | shrunk = 1; | |
159 | write_unlock(&n->lock); | |
4f494554 | 160 | neigh_cleanup_and_release(n); |
1da177e4 LT |
161 | continue; |
162 | } | |
163 | write_unlock(&n->lock); | |
164 | np = &n->next; | |
165 | } | |
166 | } | |
167 | ||
168 | tbl->last_flush = jiffies; | |
169 | ||
170 | write_unlock_bh(&tbl->lock); | |
171 | ||
172 | return shrunk; | |
173 | } | |
174 | ||
a43d8994 PE |
175 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
176 | { | |
177 | neigh_hold(n); | |
178 | if (unlikely(mod_timer(&n->timer, when))) { | |
179 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
180 | n->nud_state); | |
181 | dump_stack(); | |
182 | } | |
183 | } | |
184 | ||
1da177e4 LT |
185 | static int neigh_del_timer(struct neighbour *n) |
186 | { | |
187 | if ((n->nud_state & NUD_IN_TIMER) && | |
188 | del_timer(&n->timer)) { | |
189 | neigh_release(n); | |
190 | return 1; | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
196 | { | |
197 | struct sk_buff *skb; | |
198 | ||
199 | while ((skb = skb_dequeue(list)) != NULL) { | |
200 | dev_put(skb->dev); | |
201 | kfree_skb(skb); | |
202 | } | |
203 | } | |
204 | ||
49636bb1 | 205 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
206 | { |
207 | int i; | |
d6bf7817 | 208 | struct neigh_hash_table *nht; |
1da177e4 | 209 | |
d6bf7817 ED |
210 | nht = rcu_dereference_protected(tbl->nht, |
211 | lockdep_is_held(&tbl->lock)); | |
212 | ||
cd089336 | 213 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
214 | struct neighbour *n; |
215 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 216 | |
767e97e1 ED |
217 | while ((n = rcu_dereference_protected(*np, |
218 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
219 | if (dev && n->dev != dev) { |
220 | np = &n->next; | |
221 | continue; | |
222 | } | |
767e97e1 ED |
223 | rcu_assign_pointer(*np, |
224 | rcu_dereference_protected(n->next, | |
225 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
226 | write_lock(&n->lock); |
227 | neigh_del_timer(n); | |
228 | n->dead = 1; | |
229 | ||
230 | if (atomic_read(&n->refcnt) != 1) { | |
231 | /* The most unpleasant situation. | |
232 | We must destroy neighbour entry, | |
233 | but someone still uses it. | |
234 | ||
235 | The destroy will be delayed until | |
236 | the last user releases us, but | |
237 | we must kill timers etc. and move | |
238 | it to safe state. | |
239 | */ | |
240 | skb_queue_purge(&n->arp_queue); | |
241 | n->output = neigh_blackhole; | |
242 | if (n->nud_state & NUD_VALID) | |
243 | n->nud_state = NUD_NOARP; | |
244 | else | |
245 | n->nud_state = NUD_NONE; | |
246 | NEIGH_PRINTK2("neigh %p is stray.\n", n); | |
247 | } | |
248 | write_unlock(&n->lock); | |
4f494554 | 249 | neigh_cleanup_and_release(n); |
1da177e4 LT |
250 | } |
251 | } | |
49636bb1 | 252 | } |
1da177e4 | 253 | |
49636bb1 HX |
254 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
255 | { | |
256 | write_lock_bh(&tbl->lock); | |
257 | neigh_flush_dev(tbl, dev); | |
258 | write_unlock_bh(&tbl->lock); | |
259 | } | |
0a204500 | 260 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
261 | |
262 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
263 | { | |
264 | write_lock_bh(&tbl->lock); | |
265 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
266 | pneigh_ifdown(tbl, dev); |
267 | write_unlock_bh(&tbl->lock); | |
268 | ||
269 | del_timer_sync(&tbl->proxy_timer); | |
270 | pneigh_queue_purge(&tbl->proxy_queue); | |
271 | return 0; | |
272 | } | |
0a204500 | 273 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 LT |
274 | |
275 | static struct neighbour *neigh_alloc(struct neigh_table *tbl) | |
276 | { | |
277 | struct neighbour *n = NULL; | |
278 | unsigned long now = jiffies; | |
279 | int entries; | |
280 | ||
281 | entries = atomic_inc_return(&tbl->entries) - 1; | |
282 | if (entries >= tbl->gc_thresh3 || | |
283 | (entries >= tbl->gc_thresh2 && | |
284 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
285 | if (!neigh_forced_gc(tbl) && | |
286 | entries >= tbl->gc_thresh3) | |
287 | goto out_entries; | |
288 | } | |
289 | ||
c3762229 | 290 | n = kmem_cache_zalloc(tbl->kmem_cachep, GFP_ATOMIC); |
1da177e4 LT |
291 | if (!n) |
292 | goto out_entries; | |
293 | ||
1da177e4 LT |
294 | skb_queue_head_init(&n->arp_queue); |
295 | rwlock_init(&n->lock); | |
0ed8ddf4 | 296 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
297 | n->updated = n->used = now; |
298 | n->nud_state = NUD_NONE; | |
299 | n->output = neigh_blackhole; | |
f6b72b62 | 300 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 301 | n->parms = neigh_parms_clone(&tbl->parms); |
b24b8a24 | 302 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
303 | |
304 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
305 | n->tbl = tbl; | |
306 | atomic_set(&n->refcnt, 1); | |
307 | n->dead = 1; | |
308 | out: | |
309 | return n; | |
310 | ||
311 | out_entries: | |
312 | atomic_dec(&tbl->entries); | |
313 | goto out; | |
314 | } | |
315 | ||
cd089336 | 316 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 317 | { |
cd089336 | 318 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 319 | struct neigh_hash_table *ret; |
6193d2be | 320 | struct neighbour __rcu **buckets; |
1da177e4 | 321 | |
d6bf7817 ED |
322 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
323 | if (!ret) | |
324 | return NULL; | |
325 | if (size <= PAGE_SIZE) | |
326 | buckets = kzalloc(size, GFP_ATOMIC); | |
327 | else | |
6193d2be | 328 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
329 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
330 | get_order(size)); | |
331 | if (!buckets) { | |
332 | kfree(ret); | |
333 | return NULL; | |
1da177e4 | 334 | } |
6193d2be | 335 | ret->hash_buckets = buckets; |
cd089336 | 336 | ret->hash_shift = shift; |
d6bf7817 | 337 | get_random_bytes(&ret->hash_rnd, sizeof(ret->hash_rnd)); |
f610b74b | 338 | ret->hash_rnd |= 1; |
1da177e4 LT |
339 | return ret; |
340 | } | |
341 | ||
d6bf7817 | 342 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 343 | { |
d6bf7817 ED |
344 | struct neigh_hash_table *nht = container_of(head, |
345 | struct neigh_hash_table, | |
346 | rcu); | |
cd089336 | 347 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 348 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 LT |
349 | |
350 | if (size <= PAGE_SIZE) | |
d6bf7817 | 351 | kfree(buckets); |
1da177e4 | 352 | else |
d6bf7817 ED |
353 | free_pages((unsigned long)buckets, get_order(size)); |
354 | kfree(nht); | |
1da177e4 LT |
355 | } |
356 | ||
d6bf7817 | 357 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 358 | unsigned long new_shift) |
1da177e4 | 359 | { |
d6bf7817 ED |
360 | unsigned int i, hash; |
361 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
362 | |
363 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
364 | ||
d6bf7817 ED |
365 | old_nht = rcu_dereference_protected(tbl->nht, |
366 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 367 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
368 | if (!new_nht) |
369 | return old_nht; | |
1da177e4 | 370 | |
cd089336 | 371 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
372 | struct neighbour *n, *next; |
373 | ||
767e97e1 ED |
374 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
375 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
376 | n != NULL; |
377 | n = next) { | |
378 | hash = tbl->hash(n->primary_key, n->dev, | |
379 | new_nht->hash_rnd); | |
1da177e4 | 380 | |
cd089336 | 381 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
382 | next = rcu_dereference_protected(n->next, |
383 | lockdep_is_held(&tbl->lock)); | |
384 | ||
385 | rcu_assign_pointer(n->next, | |
386 | rcu_dereference_protected( | |
387 | new_nht->hash_buckets[hash], | |
388 | lockdep_is_held(&tbl->lock))); | |
389 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
390 | } |
391 | } | |
1da177e4 | 392 | |
d6bf7817 ED |
393 | rcu_assign_pointer(tbl->nht, new_nht); |
394 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
395 | return new_nht; | |
1da177e4 LT |
396 | } |
397 | ||
398 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
399 | struct net_device *dev) | |
400 | { | |
401 | struct neighbour *n; | |
402 | int key_len = tbl->key_len; | |
bc4bf5f3 | 403 | u32 hash_val; |
d6bf7817 | 404 | struct neigh_hash_table *nht; |
4ec93edb | 405 | |
1da177e4 LT |
406 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
407 | ||
d6bf7817 ED |
408 | rcu_read_lock_bh(); |
409 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 410 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
411 | |
412 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
413 | n != NULL; | |
414 | n = rcu_dereference_bh(n->next)) { | |
1da177e4 | 415 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
767e97e1 ED |
416 | if (!atomic_inc_not_zero(&n->refcnt)) |
417 | n = NULL; | |
1da177e4 LT |
418 | NEIGH_CACHE_STAT_INC(tbl, hits); |
419 | break; | |
420 | } | |
421 | } | |
767e97e1 | 422 | |
d6bf7817 | 423 | rcu_read_unlock_bh(); |
1da177e4 LT |
424 | return n; |
425 | } | |
0a204500 | 426 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 427 | |
426b5303 EB |
428 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
429 | const void *pkey) | |
1da177e4 LT |
430 | { |
431 | struct neighbour *n; | |
432 | int key_len = tbl->key_len; | |
bc4bf5f3 | 433 | u32 hash_val; |
d6bf7817 | 434 | struct neigh_hash_table *nht; |
1da177e4 LT |
435 | |
436 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
437 | ||
d6bf7817 ED |
438 | rcu_read_lock_bh(); |
439 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 440 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
441 | |
442 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
443 | n != NULL; | |
444 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 445 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 446 | net_eq(dev_net(n->dev), net)) { |
767e97e1 ED |
447 | if (!atomic_inc_not_zero(&n->refcnt)) |
448 | n = NULL; | |
1da177e4 LT |
449 | NEIGH_CACHE_STAT_INC(tbl, hits); |
450 | break; | |
451 | } | |
452 | } | |
767e97e1 | 453 | |
d6bf7817 | 454 | rcu_read_unlock_bh(); |
1da177e4 LT |
455 | return n; |
456 | } | |
0a204500 | 457 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 LT |
458 | |
459 | struct neighbour *neigh_create(struct neigh_table *tbl, const void *pkey, | |
460 | struct net_device *dev) | |
461 | { | |
462 | u32 hash_val; | |
463 | int key_len = tbl->key_len; | |
464 | int error; | |
465 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl); | |
d6bf7817 | 466 | struct neigh_hash_table *nht; |
1da177e4 LT |
467 | |
468 | if (!n) { | |
469 | rc = ERR_PTR(-ENOBUFS); | |
470 | goto out; | |
471 | } | |
472 | ||
473 | memcpy(n->primary_key, pkey, key_len); | |
474 | n->dev = dev; | |
475 | dev_hold(dev); | |
476 | ||
477 | /* Protocol specific setup. */ | |
478 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
479 | rc = ERR_PTR(error); | |
480 | goto out_neigh_release; | |
481 | } | |
482 | ||
483 | /* Device specific setup. */ | |
484 | if (n->parms->neigh_setup && | |
485 | (error = n->parms->neigh_setup(n)) < 0) { | |
486 | rc = ERR_PTR(error); | |
487 | goto out_neigh_release; | |
488 | } | |
489 | ||
490 | n->confirmed = jiffies - (n->parms->base_reachable_time << 1); | |
491 | ||
492 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
493 | nht = rcu_dereference_protected(tbl->nht, |
494 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 495 | |
cd089336 DM |
496 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
497 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 498 | |
cd089336 | 499 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
500 | |
501 | if (n->parms->dead) { | |
502 | rc = ERR_PTR(-EINVAL); | |
503 | goto out_tbl_unlock; | |
504 | } | |
505 | ||
767e97e1 ED |
506 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
507 | lockdep_is_held(&tbl->lock)); | |
508 | n1 != NULL; | |
509 | n1 = rcu_dereference_protected(n1->next, | |
510 | lockdep_is_held(&tbl->lock))) { | |
1da177e4 LT |
511 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
512 | neigh_hold(n1); | |
513 | rc = n1; | |
514 | goto out_tbl_unlock; | |
515 | } | |
516 | } | |
517 | ||
1da177e4 LT |
518 | n->dead = 0; |
519 | neigh_hold(n); | |
767e97e1 ED |
520 | rcu_assign_pointer(n->next, |
521 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
522 | lockdep_is_held(&tbl->lock))); | |
523 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 LT |
524 | write_unlock_bh(&tbl->lock); |
525 | NEIGH_PRINTK2("neigh %p is created.\n", n); | |
526 | rc = n; | |
527 | out: | |
528 | return rc; | |
529 | out_tbl_unlock: | |
530 | write_unlock_bh(&tbl->lock); | |
531 | out_neigh_release: | |
532 | neigh_release(n); | |
533 | goto out; | |
534 | } | |
0a204500 | 535 | EXPORT_SYMBOL(neigh_create); |
1da177e4 | 536 | |
be01d655 | 537 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 538 | { |
fa86d322 | 539 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
540 | hash_val ^= (hash_val >> 16); |
541 | hash_val ^= hash_val >> 8; | |
542 | hash_val ^= hash_val >> 4; | |
543 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
544 | return hash_val; |
545 | } | |
fa86d322 | 546 | |
be01d655 YH |
547 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
548 | struct net *net, | |
549 | const void *pkey, | |
550 | int key_len, | |
551 | struct net_device *dev) | |
552 | { | |
553 | while (n) { | |
fa86d322 | 554 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 555 | net_eq(pneigh_net(n), net) && |
fa86d322 | 556 | (n->dev == dev || !n->dev)) |
be01d655 YH |
557 | return n; |
558 | n = n->next; | |
fa86d322 | 559 | } |
be01d655 YH |
560 | return NULL; |
561 | } | |
fa86d322 | 562 | |
be01d655 YH |
563 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
564 | struct net *net, const void *pkey, struct net_device *dev) | |
565 | { | |
566 | int key_len = tbl->key_len; | |
567 | u32 hash_val = pneigh_hash(pkey, key_len); | |
568 | ||
569 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
570 | net, pkey, key_len, dev); | |
fa86d322 | 571 | } |
0a204500 | 572 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 573 | |
426b5303 EB |
574 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
575 | struct net *net, const void *pkey, | |
1da177e4 LT |
576 | struct net_device *dev, int creat) |
577 | { | |
578 | struct pneigh_entry *n; | |
579 | int key_len = tbl->key_len; | |
be01d655 | 580 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
581 | |
582 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
583 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
584 | net, pkey, key_len, dev); | |
1da177e4 | 585 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
586 | |
587 | if (n || !creat) | |
1da177e4 LT |
588 | goto out; |
589 | ||
4ae28944 PE |
590 | ASSERT_RTNL(); |
591 | ||
1da177e4 LT |
592 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
593 | if (!n) | |
594 | goto out; | |
595 | ||
e42ea986 | 596 | write_pnet(&n->net, hold_net(net)); |
1da177e4 LT |
597 | memcpy(n->key, pkey, key_len); |
598 | n->dev = dev; | |
599 | if (dev) | |
600 | dev_hold(dev); | |
601 | ||
602 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
603 | if (dev) | |
604 | dev_put(dev); | |
da12f735 | 605 | release_net(net); |
1da177e4 LT |
606 | kfree(n); |
607 | n = NULL; | |
608 | goto out; | |
609 | } | |
610 | ||
611 | write_lock_bh(&tbl->lock); | |
612 | n->next = tbl->phash_buckets[hash_val]; | |
613 | tbl->phash_buckets[hash_val] = n; | |
614 | write_unlock_bh(&tbl->lock); | |
615 | out: | |
616 | return n; | |
617 | } | |
0a204500 | 618 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
619 | |
620 | ||
426b5303 | 621 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
622 | struct net_device *dev) |
623 | { | |
624 | struct pneigh_entry *n, **np; | |
625 | int key_len = tbl->key_len; | |
be01d655 | 626 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
627 | |
628 | write_lock_bh(&tbl->lock); | |
629 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
630 | np = &n->next) { | |
426b5303 | 631 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 632 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
633 | *np = n->next; |
634 | write_unlock_bh(&tbl->lock); | |
635 | if (tbl->pdestructor) | |
636 | tbl->pdestructor(n); | |
637 | if (n->dev) | |
638 | dev_put(n->dev); | |
57da52c1 | 639 | release_net(pneigh_net(n)); |
1da177e4 LT |
640 | kfree(n); |
641 | return 0; | |
642 | } | |
643 | } | |
644 | write_unlock_bh(&tbl->lock); | |
645 | return -ENOENT; | |
646 | } | |
647 | ||
648 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
649 | { | |
650 | struct pneigh_entry *n, **np; | |
651 | u32 h; | |
652 | ||
653 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
654 | np = &tbl->phash_buckets[h]; | |
655 | while ((n = *np) != NULL) { | |
656 | if (!dev || n->dev == dev) { | |
657 | *np = n->next; | |
658 | if (tbl->pdestructor) | |
659 | tbl->pdestructor(n); | |
660 | if (n->dev) | |
661 | dev_put(n->dev); | |
57da52c1 | 662 | release_net(pneigh_net(n)); |
1da177e4 LT |
663 | kfree(n); |
664 | continue; | |
665 | } | |
666 | np = &n->next; | |
667 | } | |
668 | } | |
669 | return -ENOENT; | |
670 | } | |
671 | ||
06f0511d DL |
672 | static void neigh_parms_destroy(struct neigh_parms *parms); |
673 | ||
674 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
675 | { | |
676 | if (atomic_dec_and_test(&parms->refcnt)) | |
677 | neigh_parms_destroy(parms); | |
678 | } | |
1da177e4 | 679 | |
767e97e1 ED |
680 | static void neigh_destroy_rcu(struct rcu_head *head) |
681 | { | |
682 | struct neighbour *neigh = container_of(head, struct neighbour, rcu); | |
683 | ||
684 | kmem_cache_free(neigh->tbl->kmem_cachep, neigh); | |
685 | } | |
1da177e4 LT |
686 | /* |
687 | * neighbour must already be out of the table; | |
688 | * | |
689 | */ | |
690 | void neigh_destroy(struct neighbour *neigh) | |
691 | { | |
1da177e4 LT |
692 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
693 | ||
694 | if (!neigh->dead) { | |
695 | printk(KERN_WARNING | |
696 | "Destroying alive neighbour %p\n", neigh); | |
697 | dump_stack(); | |
698 | return; | |
699 | } | |
700 | ||
701 | if (neigh_del_timer(neigh)) | |
702 | printk(KERN_WARNING "Impossible event.\n"); | |
703 | ||
1da177e4 LT |
704 | skb_queue_purge(&neigh->arp_queue); |
705 | ||
706 | dev_put(neigh->dev); | |
707 | neigh_parms_put(neigh->parms); | |
708 | ||
709 | NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh); | |
710 | ||
711 | atomic_dec(&neigh->tbl->entries); | |
767e97e1 | 712 | call_rcu(&neigh->rcu, neigh_destroy_rcu); |
1da177e4 | 713 | } |
0a204500 | 714 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
715 | |
716 | /* Neighbour state is suspicious; | |
717 | disable fast path. | |
718 | ||
719 | Called with write_locked neigh. | |
720 | */ | |
721 | static void neigh_suspect(struct neighbour *neigh) | |
722 | { | |
1da177e4 LT |
723 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); |
724 | ||
725 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
726 | } |
727 | ||
728 | /* Neighbour state is OK; | |
729 | enable fast path. | |
730 | ||
731 | Called with write_locked neigh. | |
732 | */ | |
733 | static void neigh_connect(struct neighbour *neigh) | |
734 | { | |
1da177e4 LT |
735 | NEIGH_PRINTK2("neigh %p is connected.\n", neigh); |
736 | ||
737 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
738 | } |
739 | ||
e4c4e448 | 740 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 741 | { |
e4c4e448 | 742 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
743 | struct neighbour *n; |
744 | struct neighbour __rcu **np; | |
e4c4e448 | 745 | unsigned int i; |
d6bf7817 | 746 | struct neigh_hash_table *nht; |
1da177e4 LT |
747 | |
748 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
749 | ||
e4c4e448 | 750 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
751 | nht = rcu_dereference_protected(tbl->nht, |
752 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
753 | |
754 | /* | |
755 | * periodically recompute ReachableTime from random function | |
756 | */ | |
757 | ||
e4c4e448 | 758 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 759 | struct neigh_parms *p; |
e4c4e448 | 760 | tbl->last_rand = jiffies; |
1da177e4 LT |
761 | for (p = &tbl->parms; p; p = p->next) |
762 | p->reachable_time = | |
763 | neigh_rand_reach_time(p->base_reachable_time); | |
764 | } | |
765 | ||
cd089336 | 766 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 767 | np = &nht->hash_buckets[i]; |
1da177e4 | 768 | |
767e97e1 ED |
769 | while ((n = rcu_dereference_protected(*np, |
770 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 771 | unsigned int state; |
1da177e4 | 772 | |
e4c4e448 | 773 | write_lock(&n->lock); |
1da177e4 | 774 | |
e4c4e448 ED |
775 | state = n->nud_state; |
776 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
777 | write_unlock(&n->lock); | |
778 | goto next_elt; | |
779 | } | |
1da177e4 | 780 | |
e4c4e448 ED |
781 | if (time_before(n->used, n->confirmed)) |
782 | n->used = n->confirmed; | |
1da177e4 | 783 | |
e4c4e448 ED |
784 | if (atomic_read(&n->refcnt) == 1 && |
785 | (state == NUD_FAILED || | |
786 | time_after(jiffies, n->used + n->parms->gc_staletime))) { | |
787 | *np = n->next; | |
788 | n->dead = 1; | |
789 | write_unlock(&n->lock); | |
790 | neigh_cleanup_and_release(n); | |
791 | continue; | |
792 | } | |
1da177e4 | 793 | write_unlock(&n->lock); |
1da177e4 LT |
794 | |
795 | next_elt: | |
e4c4e448 ED |
796 | np = &n->next; |
797 | } | |
798 | /* | |
799 | * It's fine to release lock here, even if hash table | |
800 | * grows while we are preempted. | |
801 | */ | |
802 | write_unlock_bh(&tbl->lock); | |
803 | cond_resched(); | |
804 | write_lock_bh(&tbl->lock); | |
1da177e4 | 805 | } |
4ec93edb YH |
806 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
807 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 | |
808 | * base_reachable_time. | |
1da177e4 | 809 | */ |
e4c4e448 ED |
810 | schedule_delayed_work(&tbl->gc_work, |
811 | tbl->parms.base_reachable_time >> 1); | |
812 | write_unlock_bh(&tbl->lock); | |
1da177e4 LT |
813 | } |
814 | ||
815 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
816 | { | |
817 | struct neigh_parms *p = n->parms; | |
a02cec21 | 818 | return (n->nud_state & NUD_PROBE) ? |
1da177e4 | 819 | p->ucast_probes : |
a02cec21 | 820 | p->ucast_probes + p->app_probes + p->mcast_probes; |
1da177e4 LT |
821 | } |
822 | ||
5ef12d98 | 823 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
824 | __releases(neigh->lock) |
825 | __acquires(neigh->lock) | |
5ef12d98 TT |
826 | { |
827 | struct sk_buff *skb; | |
828 | ||
829 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
830 | NEIGH_PRINTK2("neigh %p is failed.\n", neigh); | |
831 | neigh->updated = jiffies; | |
832 | ||
833 | /* It is very thin place. report_unreachable is very complicated | |
834 | routine. Particularly, it can hit the same neighbour entry! | |
835 | ||
836 | So that, we try to be accurate and avoid dead loop. --ANK | |
837 | */ | |
838 | while (neigh->nud_state == NUD_FAILED && | |
839 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
840 | write_unlock(&neigh->lock); | |
841 | neigh->ops->error_report(neigh, skb); | |
842 | write_lock(&neigh->lock); | |
843 | } | |
844 | skb_queue_purge(&neigh->arp_queue); | |
845 | } | |
846 | ||
1da177e4 LT |
847 | /* Called when a timer expires for a neighbour entry. */ |
848 | ||
849 | static void neigh_timer_handler(unsigned long arg) | |
850 | { | |
851 | unsigned long now, next; | |
852 | struct neighbour *neigh = (struct neighbour *)arg; | |
853 | unsigned state; | |
854 | int notify = 0; | |
855 | ||
856 | write_lock(&neigh->lock); | |
857 | ||
858 | state = neigh->nud_state; | |
859 | now = jiffies; | |
860 | next = now + HZ; | |
861 | ||
862 | if (!(state & NUD_IN_TIMER)) { | |
863 | #ifndef CONFIG_SMP | |
864 | printk(KERN_WARNING "neigh: timer & !nud_in_timer\n"); | |
865 | #endif | |
866 | goto out; | |
867 | } | |
868 | ||
869 | if (state & NUD_REACHABLE) { | |
4ec93edb | 870 | if (time_before_eq(now, |
1da177e4 LT |
871 | neigh->confirmed + neigh->parms->reachable_time)) { |
872 | NEIGH_PRINTK2("neigh %p is still alive.\n", neigh); | |
873 | next = neigh->confirmed + neigh->parms->reachable_time; | |
874 | } else if (time_before_eq(now, | |
875 | neigh->used + neigh->parms->delay_probe_time)) { | |
876 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
877 | neigh->nud_state = NUD_DELAY; | |
955aaa2f | 878 | neigh->updated = jiffies; |
1da177e4 LT |
879 | neigh_suspect(neigh); |
880 | next = now + neigh->parms->delay_probe_time; | |
881 | } else { | |
882 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); | |
883 | neigh->nud_state = NUD_STALE; | |
955aaa2f | 884 | neigh->updated = jiffies; |
1da177e4 | 885 | neigh_suspect(neigh); |
8d71740c | 886 | notify = 1; |
1da177e4 LT |
887 | } |
888 | } else if (state & NUD_DELAY) { | |
4ec93edb | 889 | if (time_before_eq(now, |
1da177e4 LT |
890 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
891 | NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh); | |
892 | neigh->nud_state = NUD_REACHABLE; | |
955aaa2f | 893 | neigh->updated = jiffies; |
1da177e4 | 894 | neigh_connect(neigh); |
8d71740c | 895 | notify = 1; |
1da177e4 LT |
896 | next = neigh->confirmed + neigh->parms->reachable_time; |
897 | } else { | |
898 | NEIGH_PRINTK2("neigh %p is probed.\n", neigh); | |
899 | neigh->nud_state = NUD_PROBE; | |
955aaa2f | 900 | neigh->updated = jiffies; |
1da177e4 LT |
901 | atomic_set(&neigh->probes, 0); |
902 | next = now + neigh->parms->retrans_time; | |
903 | } | |
904 | } else { | |
905 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
906 | next = now + neigh->parms->retrans_time; | |
907 | } | |
908 | ||
909 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
910 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
911 | neigh->nud_state = NUD_FAILED; |
912 | notify = 1; | |
5ef12d98 | 913 | neigh_invalidate(neigh); |
1da177e4 LT |
914 | } |
915 | ||
916 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
917 | if (time_before(next, jiffies + HZ/2)) |
918 | next = jiffies + HZ/2; | |
6fb9974f HX |
919 | if (!mod_timer(&neigh->timer, next)) |
920 | neigh_hold(neigh); | |
1da177e4 LT |
921 | } |
922 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
923 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); | |
9ff56607 DM |
924 | /* keep skb alive even if arp_queue overflows */ |
925 | if (skb) | |
7e36763b | 926 | skb = skb_copy(skb, GFP_ATOMIC); |
9ff56607 | 927 | write_unlock(&neigh->lock); |
1da177e4 LT |
928 | neigh->ops->solicit(neigh, skb); |
929 | atomic_inc(&neigh->probes); | |
f3fbbe0f | 930 | kfree_skb(skb); |
9ff56607 | 931 | } else { |
69cc64d8 | 932 | out: |
9ff56607 DM |
933 | write_unlock(&neigh->lock); |
934 | } | |
d961db35 | 935 | |
8d71740c | 936 | if (notify) |
d961db35 | 937 | neigh_update_notify(neigh); |
1da177e4 | 938 | |
1da177e4 LT |
939 | neigh_release(neigh); |
940 | } | |
941 | ||
942 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
943 | { | |
944 | int rc; | |
945 | unsigned long now; | |
946 | ||
947 | write_lock_bh(&neigh->lock); | |
948 | ||
949 | rc = 0; | |
950 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
951 | goto out_unlock_bh; | |
952 | ||
953 | now = jiffies; | |
4ec93edb | 954 | |
1da177e4 LT |
955 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
956 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { | |
957 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); | |
958 | neigh->nud_state = NUD_INCOMPLETE; | |
955aaa2f | 959 | neigh->updated = jiffies; |
667347f1 | 960 | neigh_add_timer(neigh, now + 1); |
1da177e4 LT |
961 | } else { |
962 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 963 | neigh->updated = jiffies; |
1da177e4 LT |
964 | write_unlock_bh(&neigh->lock); |
965 | ||
f3fbbe0f | 966 | kfree_skb(skb); |
1da177e4 LT |
967 | return 1; |
968 | } | |
969 | } else if (neigh->nud_state & NUD_STALE) { | |
970 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); | |
1da177e4 | 971 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 972 | neigh->updated = jiffies; |
667347f1 DM |
973 | neigh_add_timer(neigh, |
974 | jiffies + neigh->parms->delay_probe_time); | |
1da177e4 LT |
975 | } |
976 | ||
977 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
978 | if (skb) { | |
979 | if (skb_queue_len(&neigh->arp_queue) >= | |
980 | neigh->parms->queue_len) { | |
981 | struct sk_buff *buff; | |
f72051b0 | 982 | buff = __skb_dequeue(&neigh->arp_queue); |
1da177e4 | 983 | kfree_skb(buff); |
9a6d276e | 984 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 985 | } |
a4731138 | 986 | skb_dst_force(skb); |
1da177e4 LT |
987 | __skb_queue_tail(&neigh->arp_queue, skb); |
988 | } | |
989 | rc = 1; | |
990 | } | |
991 | out_unlock_bh: | |
992 | write_unlock_bh(&neigh->lock); | |
993 | return rc; | |
994 | } | |
0a204500 | 995 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 996 | |
f6b72b62 | 997 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
998 | { |
999 | struct hh_cache *hh; | |
3b04ddde | 1000 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1001 | = NULL; |
1002 | ||
1003 | if (neigh->dev->header_ops) | |
1004 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1005 | |
1006 | if (update) { | |
f6b72b62 DM |
1007 | hh = &neigh->hh; |
1008 | if (hh->hh_len) { | |
3644f0ce | 1009 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1010 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1011 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1012 | } |
1013 | } | |
1014 | } | |
1015 | ||
1016 | ||
1017 | ||
1018 | /* Generic update routine. | |
1019 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1020 | -- new is new state. | |
1021 | -- flags | |
1022 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1023 | if it is different. | |
1024 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1025 | lladdr instead of overriding it |
1da177e4 LT |
1026 | if it is different. |
1027 | It also allows to retain current state | |
1028 | if lladdr is unchanged. | |
1029 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
1030 | ||
4ec93edb | 1031 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1032 | NTF_ROUTER flag. |
1033 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1034 | a router. | |
1035 | ||
1036 | Caller MUST hold reference count on the entry. | |
1037 | */ | |
1038 | ||
1039 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1040 | u32 flags) | |
1041 | { | |
1042 | u8 old; | |
1043 | int err; | |
1da177e4 | 1044 | int notify = 0; |
1da177e4 LT |
1045 | struct net_device *dev; |
1046 | int update_isrouter = 0; | |
1047 | ||
1048 | write_lock_bh(&neigh->lock); | |
1049 | ||
1050 | dev = neigh->dev; | |
1051 | old = neigh->nud_state; | |
1052 | err = -EPERM; | |
1053 | ||
4ec93edb | 1054 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1055 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1056 | goto out; | |
1057 | ||
1058 | if (!(new & NUD_VALID)) { | |
1059 | neigh_del_timer(neigh); | |
1060 | if (old & NUD_CONNECTED) | |
1061 | neigh_suspect(neigh); | |
1062 | neigh->nud_state = new; | |
1063 | err = 0; | |
1da177e4 | 1064 | notify = old & NUD_VALID; |
5ef12d98 TT |
1065 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
1066 | (new & NUD_FAILED)) { | |
1067 | neigh_invalidate(neigh); | |
1068 | notify = 1; | |
1069 | } | |
1da177e4 LT |
1070 | goto out; |
1071 | } | |
1072 | ||
1073 | /* Compare new lladdr with cached one */ | |
1074 | if (!dev->addr_len) { | |
1075 | /* First case: device needs no address. */ | |
1076 | lladdr = neigh->ha; | |
1077 | } else if (lladdr) { | |
1078 | /* The second case: if something is already cached | |
1079 | and a new address is proposed: | |
1080 | - compare new & old | |
1081 | - if they are different, check override flag | |
1082 | */ | |
4ec93edb | 1083 | if ((old & NUD_VALID) && |
1da177e4 LT |
1084 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1085 | lladdr = neigh->ha; | |
1086 | } else { | |
1087 | /* No address is supplied; if we know something, | |
1088 | use it, otherwise discard the request. | |
1089 | */ | |
1090 | err = -EINVAL; | |
1091 | if (!(old & NUD_VALID)) | |
1092 | goto out; | |
1093 | lladdr = neigh->ha; | |
1094 | } | |
1095 | ||
1096 | if (new & NUD_CONNECTED) | |
1097 | neigh->confirmed = jiffies; | |
1098 | neigh->updated = jiffies; | |
1099 | ||
1100 | /* If entry was valid and address is not changed, | |
1101 | do not change entry state, if new one is STALE. | |
1102 | */ | |
1103 | err = 0; | |
1104 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1105 | if (old & NUD_VALID) { | |
1106 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1107 | update_isrouter = 0; | |
1108 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1109 | (old & NUD_CONNECTED)) { | |
1110 | lladdr = neigh->ha; | |
1111 | new = NUD_STALE; | |
1112 | } else | |
1113 | goto out; | |
1114 | } else { | |
1115 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1116 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1117 | (old & NUD_CONNECTED)) | |
1118 | ) | |
1119 | new = old; | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | if (new != old) { | |
1124 | neigh_del_timer(neigh); | |
a43d8994 | 1125 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1126 | neigh_add_timer(neigh, (jiffies + |
1127 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1128 | neigh->parms->reachable_time : |
1129 | 0))); | |
1da177e4 LT |
1130 | neigh->nud_state = new; |
1131 | } | |
1132 | ||
1133 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1134 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1135 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1136 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1137 | neigh_update_hhs(neigh); |
1138 | if (!(new & NUD_CONNECTED)) | |
1139 | neigh->confirmed = jiffies - | |
1140 | (neigh->parms->base_reachable_time << 1); | |
1da177e4 | 1141 | notify = 1; |
1da177e4 LT |
1142 | } |
1143 | if (new == old) | |
1144 | goto out; | |
1145 | if (new & NUD_CONNECTED) | |
1146 | neigh_connect(neigh); | |
1147 | else | |
1148 | neigh_suspect(neigh); | |
1149 | if (!(old & NUD_VALID)) { | |
1150 | struct sk_buff *skb; | |
1151 | ||
1152 | /* Again: avoid dead loop if something went wrong */ | |
1153 | ||
1154 | while (neigh->nud_state & NUD_VALID && | |
1155 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
1156 | struct neighbour *n1 = neigh; | |
1157 | write_unlock_bh(&neigh->lock); | |
1158 | /* On shaper/eql skb->dst->neighbour != neigh :( */ | |
adf30907 ED |
1159 | if (skb_dst(skb) && skb_dst(skb)->neighbour) |
1160 | n1 = skb_dst(skb)->neighbour; | |
1da177e4 LT |
1161 | n1->output(skb); |
1162 | write_lock_bh(&neigh->lock); | |
1163 | } | |
1164 | skb_queue_purge(&neigh->arp_queue); | |
1165 | } | |
1166 | out: | |
1167 | if (update_isrouter) { | |
1168 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1169 | (neigh->flags | NTF_ROUTER) : | |
1170 | (neigh->flags & ~NTF_ROUTER); | |
1171 | } | |
1172 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1173 | |
1174 | if (notify) | |
d961db35 TG |
1175 | neigh_update_notify(neigh); |
1176 | ||
1da177e4 LT |
1177 | return err; |
1178 | } | |
0a204500 | 1179 | EXPORT_SYMBOL(neigh_update); |
1da177e4 LT |
1180 | |
1181 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1182 | u8 *lladdr, void *saddr, | |
1183 | struct net_device *dev) | |
1184 | { | |
1185 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1186 | lladdr || !dev->addr_len); | |
1187 | if (neigh) | |
4ec93edb | 1188 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1189 | NEIGH_UPDATE_F_OVERRIDE); |
1190 | return neigh; | |
1191 | } | |
0a204500 | 1192 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1193 | |
34d101dd | 1194 | /* called with read_lock_bh(&n->lock); */ |
f6b72b62 | 1195 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst) |
1da177e4 | 1196 | { |
1da177e4 | 1197 | struct net_device *dev = dst->dev; |
f6b72b62 DM |
1198 | __be16 prot = dst->ops->protocol; |
1199 | struct hh_cache *hh = &n->hh; | |
0ed8ddf4 ED |
1200 | |
1201 | write_lock_bh(&n->lock); | |
34d101dd | 1202 | |
f6b72b62 DM |
1203 | /* Only one thread can come in here and initialize the |
1204 | * hh_cache entry. | |
1205 | */ | |
b23b5455 DM |
1206 | if (!hh->hh_len) |
1207 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1208 | |
0ed8ddf4 | 1209 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1210 | } |
1211 | ||
1212 | /* This function can be used in contexts, where only old dev_queue_xmit | |
767e97e1 ED |
1213 | * worked, f.e. if you want to override normal output path (eql, shaper), |
1214 | * but resolution is not made yet. | |
1da177e4 LT |
1215 | */ |
1216 | ||
1217 | int neigh_compat_output(struct sk_buff *skb) | |
1218 | { | |
1219 | struct net_device *dev = skb->dev; | |
1220 | ||
bbe735e4 | 1221 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1222 | |
0c4e8581 SH |
1223 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
1224 | skb->len) < 0 && | |
3b04ddde | 1225 | dev->header_ops->rebuild(skb)) |
1da177e4 LT |
1226 | return 0; |
1227 | ||
1228 | return dev_queue_xmit(skb); | |
1229 | } | |
0a204500 | 1230 | EXPORT_SYMBOL(neigh_compat_output); |
1da177e4 LT |
1231 | |
1232 | /* Slow and careful. */ | |
1233 | ||
1234 | int neigh_resolve_output(struct sk_buff *skb) | |
1235 | { | |
adf30907 | 1236 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
1237 | struct neighbour *neigh; |
1238 | int rc = 0; | |
1239 | ||
1240 | if (!dst || !(neigh = dst->neighbour)) | |
1241 | goto discard; | |
1242 | ||
bbe735e4 | 1243 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 LT |
1244 | |
1245 | if (!neigh_event_send(neigh, skb)) { | |
1246 | int err; | |
1247 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1248 | unsigned int seq; |
34d101dd | 1249 | |
f6b72b62 DM |
1250 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
1251 | neigh_hh_init(neigh, dst); | |
34d101dd | 1252 | |
0ed8ddf4 ED |
1253 | do { |
1254 | seq = read_seqbegin(&neigh->ha_lock); | |
1255 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1256 | neigh->ha, NULL, skb->len); | |
1257 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1258 | |
1da177e4 | 1259 | if (err >= 0) |
542d4d68 | 1260 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1261 | else |
1262 | goto out_kfree_skb; | |
1263 | } | |
1264 | out: | |
1265 | return rc; | |
1266 | discard: | |
1267 | NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n", | |
1268 | dst, dst ? dst->neighbour : NULL); | |
1269 | out_kfree_skb: | |
1270 | rc = -EINVAL; | |
1271 | kfree_skb(skb); | |
1272 | goto out; | |
1273 | } | |
0a204500 | 1274 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1275 | |
1276 | /* As fast as possible without hh cache */ | |
1277 | ||
1278 | int neigh_connected_output(struct sk_buff *skb) | |
1279 | { | |
1280 | int err; | |
adf30907 | 1281 | struct dst_entry *dst = skb_dst(skb); |
1da177e4 LT |
1282 | struct neighbour *neigh = dst->neighbour; |
1283 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1284 | unsigned int seq; |
1da177e4 | 1285 | |
bbe735e4 | 1286 | __skb_pull(skb, skb_network_offset(skb)); |
1da177e4 | 1287 | |
0ed8ddf4 ED |
1288 | do { |
1289 | seq = read_seqbegin(&neigh->ha_lock); | |
1290 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1291 | neigh->ha, NULL, skb->len); | |
1292 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1293 | ||
1da177e4 | 1294 | if (err >= 0) |
542d4d68 | 1295 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1296 | else { |
1297 | err = -EINVAL; | |
1298 | kfree_skb(skb); | |
1299 | } | |
1300 | return err; | |
1301 | } | |
0a204500 | 1302 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 LT |
1303 | |
1304 | static void neigh_proxy_process(unsigned long arg) | |
1305 | { | |
1306 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1307 | long sched_next = 0; | |
1308 | unsigned long now = jiffies; | |
f72051b0 | 1309 | struct sk_buff *skb, *n; |
1da177e4 LT |
1310 | |
1311 | spin_lock(&tbl->proxy_queue.lock); | |
1312 | ||
f72051b0 DM |
1313 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1314 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1315 | |
1da177e4 | 1316 | if (tdif <= 0) { |
f72051b0 DM |
1317 | struct net_device *dev = skb->dev; |
1318 | __skb_unlink(skb, &tbl->proxy_queue); | |
1da177e4 | 1319 | if (tbl->proxy_redo && netif_running(dev)) |
f72051b0 | 1320 | tbl->proxy_redo(skb); |
1da177e4 | 1321 | else |
f72051b0 | 1322 | kfree_skb(skb); |
1da177e4 LT |
1323 | |
1324 | dev_put(dev); | |
1325 | } else if (!sched_next || tdif < sched_next) | |
1326 | sched_next = tdif; | |
1327 | } | |
1328 | del_timer(&tbl->proxy_timer); | |
1329 | if (sched_next) | |
1330 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1331 | spin_unlock(&tbl->proxy_queue.lock); | |
1332 | } | |
1333 | ||
1334 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1335 | struct sk_buff *skb) | |
1336 | { | |
1337 | unsigned long now = jiffies; | |
1338 | unsigned long sched_next = now + (net_random() % p->proxy_delay); | |
1339 | ||
1340 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { | |
1341 | kfree_skb(skb); | |
1342 | return; | |
1343 | } | |
a61bbcf2 PM |
1344 | |
1345 | NEIGH_CB(skb)->sched_next = sched_next; | |
1346 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1347 | |
1348 | spin_lock(&tbl->proxy_queue.lock); | |
1349 | if (del_timer(&tbl->proxy_timer)) { | |
1350 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1351 | sched_next = tbl->proxy_timer.expires; | |
1352 | } | |
adf30907 | 1353 | skb_dst_drop(skb); |
1da177e4 LT |
1354 | dev_hold(skb->dev); |
1355 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1356 | mod_timer(&tbl->proxy_timer, sched_next); | |
1357 | spin_unlock(&tbl->proxy_queue.lock); | |
1358 | } | |
0a204500 | 1359 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1360 | |
97fd5bc7 | 1361 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1362 | struct net *net, int ifindex) |
1363 | { | |
1364 | struct neigh_parms *p; | |
1365 | ||
1366 | for (p = &tbl->parms; p; p = p->next) { | |
878628fb | 1367 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
426b5303 EB |
1368 | (!p->dev && !ifindex)) |
1369 | return p; | |
1370 | } | |
1371 | ||
1372 | return NULL; | |
1373 | } | |
1da177e4 LT |
1374 | |
1375 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1376 | struct neigh_table *tbl) | |
1377 | { | |
426b5303 | 1378 | struct neigh_parms *p, *ref; |
00829823 SH |
1379 | struct net *net = dev_net(dev); |
1380 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1381 | |
97fd5bc7 | 1382 | ref = lookup_neigh_parms(tbl, net, 0); |
426b5303 EB |
1383 | if (!ref) |
1384 | return NULL; | |
1da177e4 | 1385 | |
426b5303 | 1386 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1387 | if (p) { |
1da177e4 LT |
1388 | p->tbl = tbl; |
1389 | atomic_set(&p->refcnt, 1); | |
1da177e4 LT |
1390 | p->reachable_time = |
1391 | neigh_rand_reach_time(p->base_reachable_time); | |
c7fb64db | 1392 | |
00829823 | 1393 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
486b51d3 DL |
1394 | kfree(p); |
1395 | return NULL; | |
1da177e4 | 1396 | } |
486b51d3 DL |
1397 | |
1398 | dev_hold(dev); | |
1399 | p->dev = dev; | |
e42ea986 | 1400 | write_pnet(&p->net, hold_net(net)); |
1da177e4 LT |
1401 | p->sysctl_table = NULL; |
1402 | write_lock_bh(&tbl->lock); | |
1403 | p->next = tbl->parms.next; | |
1404 | tbl->parms.next = p; | |
1405 | write_unlock_bh(&tbl->lock); | |
1406 | } | |
1407 | return p; | |
1408 | } | |
0a204500 | 1409 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1410 | |
1411 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1412 | { | |
1413 | struct neigh_parms *parms = | |
1414 | container_of(head, struct neigh_parms, rcu_head); | |
1415 | ||
1416 | neigh_parms_put(parms); | |
1417 | } | |
1418 | ||
1419 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1420 | { | |
1421 | struct neigh_parms **p; | |
1422 | ||
1423 | if (!parms || parms == &tbl->parms) | |
1424 | return; | |
1425 | write_lock_bh(&tbl->lock); | |
1426 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { | |
1427 | if (*p == parms) { | |
1428 | *p = parms->next; | |
1429 | parms->dead = 1; | |
1430 | write_unlock_bh(&tbl->lock); | |
cecbb639 DM |
1431 | if (parms->dev) |
1432 | dev_put(parms->dev); | |
1da177e4 LT |
1433 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1434 | return; | |
1435 | } | |
1436 | } | |
1437 | write_unlock_bh(&tbl->lock); | |
1438 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); | |
1439 | } | |
0a204500 | 1440 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1441 | |
06f0511d | 1442 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 | 1443 | { |
57da52c1 | 1444 | release_net(neigh_parms_net(parms)); |
1da177e4 LT |
1445 | kfree(parms); |
1446 | } | |
1447 | ||
c2ecba71 PE |
1448 | static struct lock_class_key neigh_table_proxy_queue_class; |
1449 | ||
bd89efc5 | 1450 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
1da177e4 LT |
1451 | { |
1452 | unsigned long now = jiffies; | |
1453 | unsigned long phsize; | |
1454 | ||
e42ea986 | 1455 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1456 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 LT |
1457 | tbl->parms.reachable_time = |
1458 | neigh_rand_reach_time(tbl->parms.base_reachable_time); | |
1459 | ||
1460 | if (!tbl->kmem_cachep) | |
e5d679f3 AD |
1461 | tbl->kmem_cachep = |
1462 | kmem_cache_create(tbl->id, tbl->entry_size, 0, | |
1463 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, | |
20c2df83 | 1464 | NULL); |
1da177e4 LT |
1465 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1466 | if (!tbl->stats) | |
1467 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1468 | |
1da177e4 | 1469 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1470 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1471 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1472 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1473 | #endif |
1474 | ||
cd089336 | 1475 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1476 | |
1477 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1478 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1479 | |
d6bf7817 | 1480 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1481 | panic("cannot allocate neighbour cache hashes"); |
1482 | ||
1da177e4 | 1483 | rwlock_init(&tbl->lock); |
e4c4e448 ED |
1484 | INIT_DELAYED_WORK_DEFERRABLE(&tbl->gc_work, neigh_periodic_work); |
1485 | schedule_delayed_work(&tbl->gc_work, tbl->parms.reachable_time); | |
b24b8a24 | 1486 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1487 | skb_queue_head_init_class(&tbl->proxy_queue, |
1488 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1489 | |
1490 | tbl->last_flush = now; | |
1491 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1492 | } |
0a204500 | 1493 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
bd89efc5 SK |
1494 | |
1495 | void neigh_table_init(struct neigh_table *tbl) | |
1496 | { | |
1497 | struct neigh_table *tmp; | |
1498 | ||
1499 | neigh_table_init_no_netlink(tbl); | |
1da177e4 | 1500 | write_lock(&neigh_tbl_lock); |
bd89efc5 SK |
1501 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
1502 | if (tmp->family == tbl->family) | |
1503 | break; | |
1504 | } | |
1da177e4 LT |
1505 | tbl->next = neigh_tables; |
1506 | neigh_tables = tbl; | |
1507 | write_unlock(&neigh_tbl_lock); | |
bd89efc5 SK |
1508 | |
1509 | if (unlikely(tmp)) { | |
1510 | printk(KERN_ERR "NEIGH: Registering multiple tables for " | |
1511 | "family %d\n", tbl->family); | |
1512 | dump_stack(); | |
1513 | } | |
1da177e4 | 1514 | } |
0a204500 | 1515 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 LT |
1516 | |
1517 | int neigh_table_clear(struct neigh_table *tbl) | |
1518 | { | |
1519 | struct neigh_table **tp; | |
1520 | ||
1521 | /* It is not clean... Fix it to unload IPv6 module safely */ | |
a5c30b34 | 1522 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1523 | del_timer_sync(&tbl->proxy_timer); |
1524 | pneigh_queue_purge(&tbl->proxy_queue); | |
1525 | neigh_ifdown(tbl, NULL); | |
1526 | if (atomic_read(&tbl->entries)) | |
1527 | printk(KERN_CRIT "neighbour leakage\n"); | |
1528 | write_lock(&neigh_tbl_lock); | |
1529 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { | |
1530 | if (*tp == tbl) { | |
1531 | *tp = tbl->next; | |
1532 | break; | |
1533 | } | |
1534 | } | |
1535 | write_unlock(&neigh_tbl_lock); | |
1536 | ||
6193d2be ED |
1537 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1538 | neigh_hash_free_rcu); | |
d6bf7817 | 1539 | tbl->nht = NULL; |
1da177e4 LT |
1540 | |
1541 | kfree(tbl->phash_buckets); | |
1542 | tbl->phash_buckets = NULL; | |
1543 | ||
3f192b5c AD |
1544 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1545 | ||
3fcde74b KK |
1546 | free_percpu(tbl->stats); |
1547 | tbl->stats = NULL; | |
1548 | ||
bfb85c9f RD |
1549 | kmem_cache_destroy(tbl->kmem_cachep); |
1550 | tbl->kmem_cachep = NULL; | |
1551 | ||
1da177e4 LT |
1552 | return 0; |
1553 | } | |
0a204500 | 1554 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1555 | |
c8822a4e | 1556 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1557 | { |
3b1e0a65 | 1558 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1559 | struct ndmsg *ndm; |
1560 | struct nlattr *dst_attr; | |
1da177e4 LT |
1561 | struct neigh_table *tbl; |
1562 | struct net_device *dev = NULL; | |
a14a49d2 | 1563 | int err = -EINVAL; |
1da177e4 | 1564 | |
110b2499 | 1565 | ASSERT_RTNL(); |
a14a49d2 | 1566 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1567 | goto out; |
1568 | ||
a14a49d2 TG |
1569 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1570 | if (dst_attr == NULL) | |
1571 | goto out; | |
1572 | ||
1573 | ndm = nlmsg_data(nlh); | |
1574 | if (ndm->ndm_ifindex) { | |
110b2499 | 1575 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1576 | if (dev == NULL) { |
1577 | err = -ENODEV; | |
1578 | goto out; | |
1579 | } | |
1580 | } | |
1581 | ||
1da177e4 LT |
1582 | read_lock(&neigh_tbl_lock); |
1583 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
a14a49d2 | 1584 | struct neighbour *neigh; |
1da177e4 LT |
1585 | |
1586 | if (tbl->family != ndm->ndm_family) | |
1587 | continue; | |
1588 | read_unlock(&neigh_tbl_lock); | |
1589 | ||
a14a49d2 | 1590 | if (nla_len(dst_attr) < tbl->key_len) |
110b2499 | 1591 | goto out; |
1da177e4 LT |
1592 | |
1593 | if (ndm->ndm_flags & NTF_PROXY) { | |
426b5303 | 1594 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
110b2499 | 1595 | goto out; |
1da177e4 LT |
1596 | } |
1597 | ||
a14a49d2 | 1598 | if (dev == NULL) |
110b2499 | 1599 | goto out; |
1da177e4 | 1600 | |
a14a49d2 TG |
1601 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1602 | if (neigh == NULL) { | |
1603 | err = -ENOENT; | |
110b2499 | 1604 | goto out; |
1da177e4 | 1605 | } |
a14a49d2 TG |
1606 | |
1607 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1608 | NEIGH_UPDATE_F_OVERRIDE | | |
1609 | NEIGH_UPDATE_F_ADMIN); | |
1610 | neigh_release(neigh); | |
110b2499 | 1611 | goto out; |
1da177e4 LT |
1612 | } |
1613 | read_unlock(&neigh_tbl_lock); | |
a14a49d2 TG |
1614 | err = -EAFNOSUPPORT; |
1615 | ||
1da177e4 LT |
1616 | out: |
1617 | return err; | |
1618 | } | |
1619 | ||
c8822a4e | 1620 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 1621 | { |
3b1e0a65 | 1622 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1623 | struct ndmsg *ndm; |
1624 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1625 | struct neigh_table *tbl; |
1626 | struct net_device *dev = NULL; | |
5208debd | 1627 | int err; |
1da177e4 | 1628 | |
110b2499 | 1629 | ASSERT_RTNL(); |
5208debd TG |
1630 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1631 | if (err < 0) | |
1da177e4 LT |
1632 | goto out; |
1633 | ||
5208debd TG |
1634 | err = -EINVAL; |
1635 | if (tb[NDA_DST] == NULL) | |
1636 | goto out; | |
1637 | ||
1638 | ndm = nlmsg_data(nlh); | |
1639 | if (ndm->ndm_ifindex) { | |
110b2499 | 1640 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1641 | if (dev == NULL) { |
1642 | err = -ENODEV; | |
1643 | goto out; | |
1644 | } | |
1645 | ||
1646 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
110b2499 | 1647 | goto out; |
5208debd TG |
1648 | } |
1649 | ||
1da177e4 LT |
1650 | read_lock(&neigh_tbl_lock); |
1651 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
5208debd TG |
1652 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
1653 | struct neighbour *neigh; | |
1654 | void *dst, *lladdr; | |
1da177e4 LT |
1655 | |
1656 | if (tbl->family != ndm->ndm_family) | |
1657 | continue; | |
1658 | read_unlock(&neigh_tbl_lock); | |
1659 | ||
5208debd | 1660 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
110b2499 | 1661 | goto out; |
5208debd TG |
1662 | dst = nla_data(tb[NDA_DST]); |
1663 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 LT |
1664 | |
1665 | if (ndm->ndm_flags & NTF_PROXY) { | |
62dd9318 VN |
1666 | struct pneigh_entry *pn; |
1667 | ||
1668 | err = -ENOBUFS; | |
426b5303 | 1669 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
62dd9318 VN |
1670 | if (pn) { |
1671 | pn->flags = ndm->ndm_flags; | |
1672 | err = 0; | |
1673 | } | |
110b2499 | 1674 | goto out; |
1da177e4 LT |
1675 | } |
1676 | ||
5208debd | 1677 | if (dev == NULL) |
110b2499 | 1678 | goto out; |
5208debd TG |
1679 | |
1680 | neigh = neigh_lookup(tbl, dst, dev); | |
1681 | if (neigh == NULL) { | |
1682 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1683 | err = -ENOENT; | |
110b2499 | 1684 | goto out; |
5208debd | 1685 | } |
4ec93edb | 1686 | |
5208debd TG |
1687 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1688 | if (IS_ERR(neigh)) { | |
1689 | err = PTR_ERR(neigh); | |
110b2499 | 1690 | goto out; |
1da177e4 | 1691 | } |
1da177e4 | 1692 | } else { |
5208debd TG |
1693 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
1694 | err = -EEXIST; | |
1695 | neigh_release(neigh); | |
110b2499 | 1696 | goto out; |
1da177e4 | 1697 | } |
1da177e4 | 1698 | |
5208debd TG |
1699 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1700 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1701 | } | |
1da177e4 | 1702 | |
0c5c2d30 EB |
1703 | if (ndm->ndm_flags & NTF_USE) { |
1704 | neigh_event_send(neigh, NULL); | |
1705 | err = 0; | |
1706 | } else | |
1707 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
5208debd | 1708 | neigh_release(neigh); |
110b2499 | 1709 | goto out; |
1da177e4 LT |
1710 | } |
1711 | ||
1712 | read_unlock(&neigh_tbl_lock); | |
5208debd | 1713 | err = -EAFNOSUPPORT; |
1da177e4 LT |
1714 | out: |
1715 | return err; | |
1716 | } | |
1717 | ||
c7fb64db TG |
1718 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1719 | { | |
ca860fb3 TG |
1720 | struct nlattr *nest; |
1721 | ||
1722 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1723 | if (nest == NULL) | |
1724 | return -ENOBUFS; | |
c7fb64db TG |
1725 | |
1726 | if (parms->dev) | |
ca860fb3 TG |
1727 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
1728 | ||
1729 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); | |
1730 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); | |
1731 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); | |
1732 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); | |
1733 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); | |
1734 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); | |
1735 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); | |
1736 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, | |
c7fb64db | 1737 | parms->base_reachable_time); |
ca860fb3 TG |
1738 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
1739 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); | |
1740 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); | |
1741 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); | |
1742 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); | |
1743 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); | |
c7fb64db | 1744 | |
ca860fb3 | 1745 | return nla_nest_end(skb, nest); |
c7fb64db | 1746 | |
ca860fb3 | 1747 | nla_put_failure: |
bc3ed28c TG |
1748 | nla_nest_cancel(skb, nest); |
1749 | return -EMSGSIZE; | |
c7fb64db TG |
1750 | } |
1751 | ||
ca860fb3 TG |
1752 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1753 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1754 | { |
1755 | struct nlmsghdr *nlh; | |
1756 | struct ndtmsg *ndtmsg; | |
1757 | ||
ca860fb3 TG |
1758 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1759 | if (nlh == NULL) | |
26932566 | 1760 | return -EMSGSIZE; |
c7fb64db | 1761 | |
ca860fb3 | 1762 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1763 | |
1764 | read_lock_bh(&tbl->lock); | |
1765 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1766 | ndtmsg->ndtm_pad1 = 0; |
1767 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1768 | |
ca860fb3 TG |
1769 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
1770 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); | |
1771 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); | |
1772 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); | |
1773 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); | |
c7fb64db TG |
1774 | |
1775 | { | |
1776 | unsigned long now = jiffies; | |
1777 | unsigned int flush_delta = now - tbl->last_flush; | |
1778 | unsigned int rand_delta = now - tbl->last_rand; | |
d6bf7817 | 1779 | struct neigh_hash_table *nht; |
c7fb64db TG |
1780 | struct ndt_config ndc = { |
1781 | .ndtc_key_len = tbl->key_len, | |
1782 | .ndtc_entry_size = tbl->entry_size, | |
1783 | .ndtc_entries = atomic_read(&tbl->entries), | |
1784 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1785 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
1786 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
1787 | }; | |
1788 | ||
d6bf7817 ED |
1789 | rcu_read_lock_bh(); |
1790 | nht = rcu_dereference_bh(tbl->nht); | |
1791 | ndc.ndtc_hash_rnd = nht->hash_rnd; | |
cd089336 | 1792 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
1793 | rcu_read_unlock_bh(); |
1794 | ||
ca860fb3 | 1795 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
c7fb64db TG |
1796 | } |
1797 | ||
1798 | { | |
1799 | int cpu; | |
1800 | struct ndt_stats ndst; | |
1801 | ||
1802 | memset(&ndst, 0, sizeof(ndst)); | |
1803 | ||
6f912042 | 1804 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1805 | struct neigh_statistics *st; |
1806 | ||
c7fb64db TG |
1807 | st = per_cpu_ptr(tbl->stats, cpu); |
1808 | ndst.ndts_allocs += st->allocs; | |
1809 | ndst.ndts_destroys += st->destroys; | |
1810 | ndst.ndts_hash_grows += st->hash_grows; | |
1811 | ndst.ndts_res_failed += st->res_failed; | |
1812 | ndst.ndts_lookups += st->lookups; | |
1813 | ndst.ndts_hits += st->hits; | |
1814 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1815 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1816 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1817 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1818 | } | |
1819 | ||
ca860fb3 | 1820 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
c7fb64db TG |
1821 | } |
1822 | ||
1823 | BUG_ON(tbl->parms.dev); | |
1824 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1825 | goto nla_put_failure; |
c7fb64db TG |
1826 | |
1827 | read_unlock_bh(&tbl->lock); | |
ca860fb3 | 1828 | return nlmsg_end(skb, nlh); |
c7fb64db | 1829 | |
ca860fb3 | 1830 | nla_put_failure: |
c7fb64db | 1831 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1832 | nlmsg_cancel(skb, nlh); |
1833 | return -EMSGSIZE; | |
c7fb64db TG |
1834 | } |
1835 | ||
ca860fb3 TG |
1836 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1837 | struct neigh_table *tbl, | |
c7fb64db | 1838 | struct neigh_parms *parms, |
ca860fb3 TG |
1839 | u32 pid, u32 seq, int type, |
1840 | unsigned int flags) | |
c7fb64db TG |
1841 | { |
1842 | struct ndtmsg *ndtmsg; | |
1843 | struct nlmsghdr *nlh; | |
1844 | ||
ca860fb3 TG |
1845 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1846 | if (nlh == NULL) | |
26932566 | 1847 | return -EMSGSIZE; |
c7fb64db | 1848 | |
ca860fb3 | 1849 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1850 | |
1851 | read_lock_bh(&tbl->lock); | |
1852 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1853 | ndtmsg->ndtm_pad1 = 0; |
1854 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1855 | |
ca860fb3 TG |
1856 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1857 | neightbl_fill_parms(skb, parms) < 0) | |
1858 | goto errout; | |
c7fb64db TG |
1859 | |
1860 | read_unlock_bh(&tbl->lock); | |
ca860fb3 TG |
1861 | return nlmsg_end(skb, nlh); |
1862 | errout: | |
c7fb64db | 1863 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1864 | nlmsg_cancel(skb, nlh); |
1865 | return -EMSGSIZE; | |
c7fb64db | 1866 | } |
4ec93edb | 1867 | |
ef7c79ed | 1868 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1869 | [NDTA_NAME] = { .type = NLA_STRING }, |
1870 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1871 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1872 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1873 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1874 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1875 | }; | |
1876 | ||
ef7c79ed | 1877 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1878 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1879 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1880 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1881 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1882 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1883 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
1884 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, | |
1885 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1886 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1887 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1888 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1889 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1890 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1891 | }; | |
1892 | ||
c8822a4e | 1893 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
c7fb64db | 1894 | { |
3b1e0a65 | 1895 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1896 | struct neigh_table *tbl; |
6b3f8674 TG |
1897 | struct ndtmsg *ndtmsg; |
1898 | struct nlattr *tb[NDTA_MAX+1]; | |
1899 | int err; | |
c7fb64db | 1900 | |
6b3f8674 TG |
1901 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1902 | nl_neightbl_policy); | |
1903 | if (err < 0) | |
1904 | goto errout; | |
c7fb64db | 1905 | |
6b3f8674 TG |
1906 | if (tb[NDTA_NAME] == NULL) { |
1907 | err = -EINVAL; | |
1908 | goto errout; | |
1909 | } | |
1910 | ||
1911 | ndtmsg = nlmsg_data(nlh); | |
c7fb64db TG |
1912 | read_lock(&neigh_tbl_lock); |
1913 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { | |
1914 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) | |
1915 | continue; | |
1916 | ||
6b3f8674 | 1917 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
c7fb64db TG |
1918 | break; |
1919 | } | |
1920 | ||
1921 | if (tbl == NULL) { | |
1922 | err = -ENOENT; | |
6b3f8674 | 1923 | goto errout_locked; |
c7fb64db TG |
1924 | } |
1925 | ||
4ec93edb | 1926 | /* |
c7fb64db TG |
1927 | * We acquire tbl->lock to be nice to the periodic timers and |
1928 | * make sure they always see a consistent set of values. | |
1929 | */ | |
1930 | write_lock_bh(&tbl->lock); | |
1931 | ||
6b3f8674 TG |
1932 | if (tb[NDTA_PARMS]) { |
1933 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1934 | struct neigh_parms *p; |
6b3f8674 | 1935 | int i, ifindex = 0; |
c7fb64db | 1936 | |
6b3f8674 TG |
1937 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1938 | nl_ntbl_parm_policy); | |
1939 | if (err < 0) | |
1940 | goto errout_tbl_lock; | |
c7fb64db | 1941 | |
6b3f8674 TG |
1942 | if (tbp[NDTPA_IFINDEX]) |
1943 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1944 | |
97fd5bc7 | 1945 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
1946 | if (p == NULL) { |
1947 | err = -ENOENT; | |
6b3f8674 | 1948 | goto errout_tbl_lock; |
c7fb64db | 1949 | } |
c7fb64db | 1950 | |
6b3f8674 TG |
1951 | for (i = 1; i <= NDTPA_MAX; i++) { |
1952 | if (tbp[i] == NULL) | |
1953 | continue; | |
c7fb64db | 1954 | |
6b3f8674 TG |
1955 | switch (i) { |
1956 | case NDTPA_QUEUE_LEN: | |
1957 | p->queue_len = nla_get_u32(tbp[i]); | |
1958 | break; | |
1959 | case NDTPA_PROXY_QLEN: | |
1960 | p->proxy_qlen = nla_get_u32(tbp[i]); | |
1961 | break; | |
1962 | case NDTPA_APP_PROBES: | |
1963 | p->app_probes = nla_get_u32(tbp[i]); | |
1964 | break; | |
1965 | case NDTPA_UCAST_PROBES: | |
1966 | p->ucast_probes = nla_get_u32(tbp[i]); | |
1967 | break; | |
1968 | case NDTPA_MCAST_PROBES: | |
1969 | p->mcast_probes = nla_get_u32(tbp[i]); | |
1970 | break; | |
1971 | case NDTPA_BASE_REACHABLE_TIME: | |
1972 | p->base_reachable_time = nla_get_msecs(tbp[i]); | |
1973 | break; | |
1974 | case NDTPA_GC_STALETIME: | |
1975 | p->gc_staletime = nla_get_msecs(tbp[i]); | |
1976 | break; | |
1977 | case NDTPA_DELAY_PROBE_TIME: | |
1978 | p->delay_probe_time = nla_get_msecs(tbp[i]); | |
1979 | break; | |
1980 | case NDTPA_RETRANS_TIME: | |
1981 | p->retrans_time = nla_get_msecs(tbp[i]); | |
1982 | break; | |
1983 | case NDTPA_ANYCAST_DELAY: | |
1984 | p->anycast_delay = nla_get_msecs(tbp[i]); | |
1985 | break; | |
1986 | case NDTPA_PROXY_DELAY: | |
1987 | p->proxy_delay = nla_get_msecs(tbp[i]); | |
1988 | break; | |
1989 | case NDTPA_LOCKTIME: | |
1990 | p->locktime = nla_get_msecs(tbp[i]); | |
1991 | break; | |
1992 | } | |
1993 | } | |
1994 | } | |
c7fb64db | 1995 | |
6b3f8674 TG |
1996 | if (tb[NDTA_THRESH1]) |
1997 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 1998 | |
6b3f8674 TG |
1999 | if (tb[NDTA_THRESH2]) |
2000 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2001 | |
6b3f8674 TG |
2002 | if (tb[NDTA_THRESH3]) |
2003 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2004 | |
6b3f8674 TG |
2005 | if (tb[NDTA_GC_INTERVAL]) |
2006 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2007 | |
2008 | err = 0; | |
2009 | ||
6b3f8674 | 2010 | errout_tbl_lock: |
c7fb64db | 2011 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2012 | errout_locked: |
c7fb64db | 2013 | read_unlock(&neigh_tbl_lock); |
6b3f8674 | 2014 | errout: |
c7fb64db TG |
2015 | return err; |
2016 | } | |
2017 | ||
c8822a4e | 2018 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2019 | { |
3b1e0a65 | 2020 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2021 | int family, tidx, nidx = 0; |
2022 | int tbl_skip = cb->args[0]; | |
2023 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2024 | struct neigh_table *tbl; |
2025 | ||
ca860fb3 | 2026 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db TG |
2027 | |
2028 | read_lock(&neigh_tbl_lock); | |
ca860fb3 | 2029 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
c7fb64db TG |
2030 | struct neigh_parms *p; |
2031 | ||
ca860fb3 | 2032 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2033 | continue; |
2034 | ||
ca860fb3 TG |
2035 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
2036 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, | |
2037 | NLM_F_MULTI) <= 0) | |
c7fb64db TG |
2038 | break; |
2039 | ||
426b5303 | 2040 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
878628fb | 2041 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2042 | continue; |
2043 | ||
efc683fc GK |
2044 | if (nidx < neigh_skip) |
2045 | goto next; | |
c7fb64db | 2046 | |
ca860fb3 TG |
2047 | if (neightbl_fill_param_info(skb, tbl, p, |
2048 | NETLINK_CB(cb->skb).pid, | |
2049 | cb->nlh->nlmsg_seq, | |
2050 | RTM_NEWNEIGHTBL, | |
2051 | NLM_F_MULTI) <= 0) | |
c7fb64db | 2052 | goto out; |
efc683fc GK |
2053 | next: |
2054 | nidx++; | |
c7fb64db TG |
2055 | } |
2056 | ||
ca860fb3 | 2057 | neigh_skip = 0; |
c7fb64db TG |
2058 | } |
2059 | out: | |
2060 | read_unlock(&neigh_tbl_lock); | |
ca860fb3 TG |
2061 | cb->args[0] = tidx; |
2062 | cb->args[1] = nidx; | |
c7fb64db TG |
2063 | |
2064 | return skb->len; | |
2065 | } | |
1da177e4 | 2066 | |
8b8aec50 TG |
2067 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2068 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2069 | { |
2070 | unsigned long now = jiffies; | |
1da177e4 | 2071 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2072 | struct nlmsghdr *nlh; |
2073 | struct ndmsg *ndm; | |
2074 | ||
2075 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2076 | if (nlh == NULL) | |
26932566 | 2077 | return -EMSGSIZE; |
1da177e4 | 2078 | |
8b8aec50 TG |
2079 | ndm = nlmsg_data(nlh); |
2080 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2081 | ndm->ndm_pad1 = 0; |
2082 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2083 | ndm->ndm_flags = neigh->flags; |
2084 | ndm->ndm_type = neigh->type; | |
2085 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2086 | |
8b8aec50 TG |
2087 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
2088 | ||
2089 | read_lock_bh(&neigh->lock); | |
2090 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2091 | if (neigh->nud_state & NUD_VALID) { |
2092 | char haddr[MAX_ADDR_LEN]; | |
2093 | ||
2094 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2095 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2096 | read_unlock_bh(&neigh->lock); | |
2097 | goto nla_put_failure; | |
2098 | } | |
8b8aec50 TG |
2099 | } |
2100 | ||
b9f5f52c SH |
2101 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2102 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2103 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2104 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2105 | read_unlock_bh(&neigh->lock); | |
2106 | ||
2107 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); | |
2108 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); | |
2109 | ||
2110 | return nlmsg_end(skb, nlh); | |
2111 | ||
2112 | nla_put_failure: | |
26932566 PM |
2113 | nlmsg_cancel(skb, nlh); |
2114 | return -EMSGSIZE; | |
1da177e4 LT |
2115 | } |
2116 | ||
d961db35 TG |
2117 | static void neigh_update_notify(struct neighbour *neigh) |
2118 | { | |
2119 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2120 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2121 | } | |
1da177e4 LT |
2122 | |
2123 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2124 | struct netlink_callback *cb) | |
2125 | { | |
767e97e1 | 2126 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2127 | struct neighbour *n; |
2128 | int rc, h, s_h = cb->args[1]; | |
2129 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2130 | struct neigh_hash_table *nht; |
1da177e4 | 2131 | |
d6bf7817 ED |
2132 | rcu_read_lock_bh(); |
2133 | nht = rcu_dereference_bh(tbl->nht); | |
2134 | ||
cd089336 | 2135 | for (h = 0; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2136 | if (h < s_h) |
2137 | continue; | |
2138 | if (h > s_h) | |
2139 | s_idx = 0; | |
767e97e1 ED |
2140 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2141 | n != NULL; | |
2142 | n = rcu_dereference_bh(n->next)) { | |
09ad9bc7 | 2143 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2144 | continue; |
efc683fc GK |
2145 | if (idx < s_idx) |
2146 | goto next; | |
1da177e4 LT |
2147 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, |
2148 | cb->nlh->nlmsg_seq, | |
b6544c0b JHS |
2149 | RTM_NEWNEIGH, |
2150 | NLM_F_MULTI) <= 0) { | |
1da177e4 LT |
2151 | rc = -1; |
2152 | goto out; | |
2153 | } | |
767e97e1 | 2154 | next: |
efc683fc | 2155 | idx++; |
1da177e4 | 2156 | } |
1da177e4 LT |
2157 | } |
2158 | rc = skb->len; | |
2159 | out: | |
d6bf7817 | 2160 | rcu_read_unlock_bh(); |
1da177e4 LT |
2161 | cb->args[1] = h; |
2162 | cb->args[2] = idx; | |
2163 | return rc; | |
2164 | } | |
2165 | ||
c8822a4e | 2166 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2167 | { |
2168 | struct neigh_table *tbl; | |
2169 | int t, family, s_t; | |
2170 | ||
2171 | read_lock(&neigh_tbl_lock); | |
8b8aec50 | 2172 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
1da177e4 LT |
2173 | s_t = cb->args[0]; |
2174 | ||
2175 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { | |
2176 | if (t < s_t || (family && tbl->family != family)) | |
2177 | continue; | |
2178 | if (t > s_t) | |
2179 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2180 | sizeof(cb->args[0])); | |
2181 | if (neigh_dump_table(tbl, skb, cb) < 0) | |
2182 | break; | |
2183 | } | |
2184 | read_unlock(&neigh_tbl_lock); | |
2185 | ||
2186 | cb->args[0] = t; | |
2187 | return skb->len; | |
2188 | } | |
2189 | ||
2190 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2191 | { | |
2192 | int chain; | |
d6bf7817 | 2193 | struct neigh_hash_table *nht; |
1da177e4 | 2194 | |
d6bf7817 ED |
2195 | rcu_read_lock_bh(); |
2196 | nht = rcu_dereference_bh(tbl->nht); | |
2197 | ||
767e97e1 | 2198 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2199 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2200 | struct neighbour *n; |
2201 | ||
767e97e1 ED |
2202 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2203 | n != NULL; | |
2204 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2205 | cb(n, cookie); |
2206 | } | |
d6bf7817 ED |
2207 | read_unlock(&tbl->lock); |
2208 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2209 | } |
2210 | EXPORT_SYMBOL(neigh_for_each); | |
2211 | ||
2212 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2213 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2214 | int (*cb)(struct neighbour *)) | |
2215 | { | |
2216 | int chain; | |
d6bf7817 | 2217 | struct neigh_hash_table *nht; |
1da177e4 | 2218 | |
d6bf7817 ED |
2219 | nht = rcu_dereference_protected(tbl->nht, |
2220 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2221 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2222 | struct neighbour *n; |
2223 | struct neighbour __rcu **np; | |
1da177e4 | 2224 | |
d6bf7817 | 2225 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2226 | while ((n = rcu_dereference_protected(*np, |
2227 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2228 | int release; |
2229 | ||
2230 | write_lock(&n->lock); | |
2231 | release = cb(n); | |
2232 | if (release) { | |
767e97e1 ED |
2233 | rcu_assign_pointer(*np, |
2234 | rcu_dereference_protected(n->next, | |
2235 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
2236 | n->dead = 1; |
2237 | } else | |
2238 | np = &n->next; | |
2239 | write_unlock(&n->lock); | |
4f494554 TG |
2240 | if (release) |
2241 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2242 | } |
2243 | } | |
2244 | } | |
2245 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2246 | ||
2247 | #ifdef CONFIG_PROC_FS | |
2248 | ||
2249 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2250 | { | |
2251 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2252 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2253 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2254 | struct neighbour *n = NULL; |
2255 | int bucket = state->bucket; | |
2256 | ||
2257 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 2258 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 2259 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
2260 | |
2261 | while (n) { | |
878628fb | 2262 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2263 | goto next; |
1da177e4 LT |
2264 | if (state->neigh_sub_iter) { |
2265 | loff_t fakep = 0; | |
2266 | void *v; | |
2267 | ||
2268 | v = state->neigh_sub_iter(state, n, &fakep); | |
2269 | if (!v) | |
2270 | goto next; | |
2271 | } | |
2272 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2273 | break; | |
2274 | if (n->nud_state & ~NUD_NOARP) | |
2275 | break; | |
767e97e1 ED |
2276 | next: |
2277 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2278 | } |
2279 | ||
2280 | if (n) | |
2281 | break; | |
2282 | } | |
2283 | state->bucket = bucket; | |
2284 | ||
2285 | return n; | |
2286 | } | |
2287 | ||
2288 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2289 | struct neighbour *n, | |
2290 | loff_t *pos) | |
2291 | { | |
2292 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2293 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2294 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2295 | |
2296 | if (state->neigh_sub_iter) { | |
2297 | void *v = state->neigh_sub_iter(state, n, pos); | |
2298 | if (v) | |
2299 | return n; | |
2300 | } | |
767e97e1 | 2301 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
2302 | |
2303 | while (1) { | |
2304 | while (n) { | |
878628fb | 2305 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2306 | goto next; |
1da177e4 LT |
2307 | if (state->neigh_sub_iter) { |
2308 | void *v = state->neigh_sub_iter(state, n, pos); | |
2309 | if (v) | |
2310 | return n; | |
2311 | goto next; | |
2312 | } | |
2313 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2314 | break; | |
2315 | ||
2316 | if (n->nud_state & ~NUD_NOARP) | |
2317 | break; | |
767e97e1 ED |
2318 | next: |
2319 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2320 | } |
2321 | ||
2322 | if (n) | |
2323 | break; | |
2324 | ||
cd089336 | 2325 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
2326 | break; |
2327 | ||
767e97e1 | 2328 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
2329 | } |
2330 | ||
2331 | if (n && pos) | |
2332 | --(*pos); | |
2333 | return n; | |
2334 | } | |
2335 | ||
2336 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2337 | { | |
2338 | struct neighbour *n = neigh_get_first(seq); | |
2339 | ||
2340 | if (n) { | |
745e2031 | 2341 | --(*pos); |
1da177e4 LT |
2342 | while (*pos) { |
2343 | n = neigh_get_next(seq, n, pos); | |
2344 | if (!n) | |
2345 | break; | |
2346 | } | |
2347 | } | |
2348 | return *pos ? NULL : n; | |
2349 | } | |
2350 | ||
2351 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2352 | { | |
2353 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2354 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2355 | struct neigh_table *tbl = state->tbl; |
2356 | struct pneigh_entry *pn = NULL; | |
2357 | int bucket = state->bucket; | |
2358 | ||
2359 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2360 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2361 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2362 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2363 | pn = pn->next; |
1da177e4 LT |
2364 | if (pn) |
2365 | break; | |
2366 | } | |
2367 | state->bucket = bucket; | |
2368 | ||
2369 | return pn; | |
2370 | } | |
2371 | ||
2372 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2373 | struct pneigh_entry *pn, | |
2374 | loff_t *pos) | |
2375 | { | |
2376 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2377 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2378 | struct neigh_table *tbl = state->tbl; |
2379 | ||
2380 | pn = pn->next; | |
2381 | while (!pn) { | |
2382 | if (++state->bucket > PNEIGH_HASHMASK) | |
2383 | break; | |
2384 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2385 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2386 | pn = pn->next; |
1da177e4 LT |
2387 | if (pn) |
2388 | break; | |
2389 | } | |
2390 | ||
2391 | if (pn && pos) | |
2392 | --(*pos); | |
2393 | ||
2394 | return pn; | |
2395 | } | |
2396 | ||
2397 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2398 | { | |
2399 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2400 | ||
2401 | if (pn) { | |
745e2031 | 2402 | --(*pos); |
1da177e4 LT |
2403 | while (*pos) { |
2404 | pn = pneigh_get_next(seq, pn, pos); | |
2405 | if (!pn) | |
2406 | break; | |
2407 | } | |
2408 | } | |
2409 | return *pos ? NULL : pn; | |
2410 | } | |
2411 | ||
2412 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2413 | { | |
2414 | struct neigh_seq_state *state = seq->private; | |
2415 | void *rc; | |
745e2031 | 2416 | loff_t idxpos = *pos; |
1da177e4 | 2417 | |
745e2031 | 2418 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2419 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2420 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2421 | |
2422 | return rc; | |
2423 | } | |
2424 | ||
2425 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
d6bf7817 | 2426 | __acquires(rcu_bh) |
1da177e4 LT |
2427 | { |
2428 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2429 | |
2430 | state->tbl = tbl; | |
2431 | state->bucket = 0; | |
2432 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2433 | ||
d6bf7817 ED |
2434 | rcu_read_lock_bh(); |
2435 | state->nht = rcu_dereference_bh(tbl->nht); | |
767e97e1 | 2436 | |
745e2031 | 2437 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2438 | } |
2439 | EXPORT_SYMBOL(neigh_seq_start); | |
2440 | ||
2441 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2442 | { | |
2443 | struct neigh_seq_state *state; | |
2444 | void *rc; | |
2445 | ||
2446 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2447 | rc = neigh_get_first(seq); |
1da177e4 LT |
2448 | goto out; |
2449 | } | |
2450 | ||
2451 | state = seq->private; | |
2452 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2453 | rc = neigh_get_next(seq, v, NULL); | |
2454 | if (rc) | |
2455 | goto out; | |
2456 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2457 | rc = pneigh_get_first(seq); | |
2458 | } else { | |
2459 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2460 | rc = pneigh_get_next(seq, v, NULL); | |
2461 | } | |
2462 | out: | |
2463 | ++(*pos); | |
2464 | return rc; | |
2465 | } | |
2466 | EXPORT_SYMBOL(neigh_seq_next); | |
2467 | ||
2468 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
d6bf7817 | 2469 | __releases(rcu_bh) |
1da177e4 | 2470 | { |
d6bf7817 | 2471 | rcu_read_unlock_bh(); |
1da177e4 LT |
2472 | } |
2473 | EXPORT_SYMBOL(neigh_seq_stop); | |
2474 | ||
2475 | /* statistics via seq_file */ | |
2476 | ||
2477 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2478 | { | |
81c1ebfc | 2479 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2480 | int cpu; |
2481 | ||
2482 | if (*pos == 0) | |
2483 | return SEQ_START_TOKEN; | |
4ec93edb | 2484 | |
0f23174a | 2485 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2486 | if (!cpu_possible(cpu)) |
2487 | continue; | |
2488 | *pos = cpu+1; | |
2489 | return per_cpu_ptr(tbl->stats, cpu); | |
2490 | } | |
2491 | return NULL; | |
2492 | } | |
2493 | ||
2494 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2495 | { | |
81c1ebfc | 2496 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2497 | int cpu; |
2498 | ||
0f23174a | 2499 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2500 | if (!cpu_possible(cpu)) |
2501 | continue; | |
2502 | *pos = cpu+1; | |
2503 | return per_cpu_ptr(tbl->stats, cpu); | |
2504 | } | |
2505 | return NULL; | |
2506 | } | |
2507 | ||
2508 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2509 | { | |
2510 | ||
2511 | } | |
2512 | ||
2513 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2514 | { | |
81c1ebfc | 2515 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2516 | struct neigh_statistics *st = v; |
2517 | ||
2518 | if (v == SEQ_START_TOKEN) { | |
9a6d276e | 2519 | 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 |
2520 | return 0; |
2521 | } | |
2522 | ||
2523 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
9a6d276e | 2524 | "%08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2525 | atomic_read(&tbl->entries), |
2526 | ||
2527 | st->allocs, | |
2528 | st->destroys, | |
2529 | st->hash_grows, | |
2530 | ||
2531 | st->lookups, | |
2532 | st->hits, | |
2533 | ||
2534 | st->res_failed, | |
2535 | ||
2536 | st->rcv_probes_mcast, | |
2537 | st->rcv_probes_ucast, | |
2538 | ||
2539 | st->periodic_gc_runs, | |
9a6d276e NH |
2540 | st->forced_gc_runs, |
2541 | st->unres_discards | |
1da177e4 LT |
2542 | ); |
2543 | ||
2544 | return 0; | |
2545 | } | |
2546 | ||
f690808e | 2547 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2548 | .start = neigh_stat_seq_start, |
2549 | .next = neigh_stat_seq_next, | |
2550 | .stop = neigh_stat_seq_stop, | |
2551 | .show = neigh_stat_seq_show, | |
2552 | }; | |
2553 | ||
2554 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2555 | { | |
2556 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2557 | ||
2558 | if (!ret) { | |
2559 | struct seq_file *sf = file->private_data; | |
81c1ebfc | 2560 | sf->private = PDE(inode)->data; |
1da177e4 LT |
2561 | } |
2562 | return ret; | |
2563 | }; | |
2564 | ||
9a32144e | 2565 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2566 | .owner = THIS_MODULE, |
2567 | .open = neigh_stat_seq_open, | |
2568 | .read = seq_read, | |
2569 | .llseek = seq_lseek, | |
2570 | .release = seq_release, | |
2571 | }; | |
2572 | ||
2573 | #endif /* CONFIG_PROC_FS */ | |
2574 | ||
339bf98f TG |
2575 | static inline size_t neigh_nlmsg_size(void) |
2576 | { | |
2577 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2578 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2579 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2580 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2581 | + nla_total_size(4); /* NDA_PROBES */ | |
2582 | } | |
2583 | ||
b8673311 | 2584 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2585 | { |
c346dca1 | 2586 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2587 | struct sk_buff *skb; |
b8673311 | 2588 | int err = -ENOBUFS; |
1da177e4 | 2589 | |
339bf98f | 2590 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2591 | if (skb == NULL) |
b8673311 | 2592 | goto errout; |
1da177e4 | 2593 | |
b8673311 | 2594 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2595 | if (err < 0) { |
2596 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2597 | WARN_ON(err == -EMSGSIZE); | |
2598 | kfree_skb(skb); | |
2599 | goto errout; | |
2600 | } | |
1ce85fe4 PNA |
2601 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2602 | return; | |
b8673311 TG |
2603 | errout: |
2604 | if (err < 0) | |
426b5303 | 2605 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2606 | } |
2607 | ||
d961db35 | 2608 | #ifdef CONFIG_ARPD |
b8673311 | 2609 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2610 | { |
b8673311 TG |
2611 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2612 | } | |
0a204500 | 2613 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2614 | #endif /* CONFIG_ARPD */ |
2615 | ||
2616 | #ifdef CONFIG_SYSCTL | |
2617 | ||
54716e3b EB |
2618 | #define NEIGH_VARS_MAX 19 |
2619 | ||
1da177e4 LT |
2620 | static struct neigh_sysctl_table { |
2621 | struct ctl_table_header *sysctl_header; | |
54716e3b | 2622 | struct ctl_table neigh_vars[NEIGH_VARS_MAX]; |
c3bac5a7 | 2623 | char *dev_name; |
ab32ea5d | 2624 | } neigh_sysctl_template __read_mostly = { |
1da177e4 LT |
2625 | .neigh_vars = { |
2626 | { | |
1da177e4 LT |
2627 | .procname = "mcast_solicit", |
2628 | .maxlen = sizeof(int), | |
2629 | .mode = 0644, | |
6d9f239a | 2630 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2631 | }, |
2632 | { | |
1da177e4 LT |
2633 | .procname = "ucast_solicit", |
2634 | .maxlen = sizeof(int), | |
2635 | .mode = 0644, | |
6d9f239a | 2636 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2637 | }, |
2638 | { | |
1da177e4 LT |
2639 | .procname = "app_solicit", |
2640 | .maxlen = sizeof(int), | |
2641 | .mode = 0644, | |
6d9f239a | 2642 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2643 | }, |
2644 | { | |
1da177e4 LT |
2645 | .procname = "retrans_time", |
2646 | .maxlen = sizeof(int), | |
2647 | .mode = 0644, | |
6d9f239a | 2648 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2649 | }, |
2650 | { | |
1da177e4 LT |
2651 | .procname = "base_reachable_time", |
2652 | .maxlen = sizeof(int), | |
2653 | .mode = 0644, | |
6d9f239a | 2654 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2655 | }, |
2656 | { | |
1da177e4 LT |
2657 | .procname = "delay_first_probe_time", |
2658 | .maxlen = sizeof(int), | |
2659 | .mode = 0644, | |
6d9f239a | 2660 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2661 | }, |
2662 | { | |
1da177e4 LT |
2663 | .procname = "gc_stale_time", |
2664 | .maxlen = sizeof(int), | |
2665 | .mode = 0644, | |
6d9f239a | 2666 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2667 | }, |
2668 | { | |
1da177e4 LT |
2669 | .procname = "unres_qlen", |
2670 | .maxlen = sizeof(int), | |
2671 | .mode = 0644, | |
6d9f239a | 2672 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2673 | }, |
2674 | { | |
1da177e4 LT |
2675 | .procname = "proxy_qlen", |
2676 | .maxlen = sizeof(int), | |
2677 | .mode = 0644, | |
6d9f239a | 2678 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2679 | }, |
2680 | { | |
1da177e4 LT |
2681 | .procname = "anycast_delay", |
2682 | .maxlen = sizeof(int), | |
2683 | .mode = 0644, | |
6d9f239a | 2684 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2685 | }, |
2686 | { | |
1da177e4 LT |
2687 | .procname = "proxy_delay", |
2688 | .maxlen = sizeof(int), | |
2689 | .mode = 0644, | |
6d9f239a | 2690 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 LT |
2691 | }, |
2692 | { | |
1da177e4 LT |
2693 | .procname = "locktime", |
2694 | .maxlen = sizeof(int), | |
2695 | .mode = 0644, | |
6d9f239a | 2696 | .proc_handler = proc_dointvec_userhz_jiffies, |
1da177e4 | 2697 | }, |
d12af679 | 2698 | { |
d12af679 EB |
2699 | .procname = "retrans_time_ms", |
2700 | .maxlen = sizeof(int), | |
2701 | .mode = 0644, | |
6d9f239a | 2702 | .proc_handler = proc_dointvec_ms_jiffies, |
d12af679 EB |
2703 | }, |
2704 | { | |
d12af679 EB |
2705 | .procname = "base_reachable_time_ms", |
2706 | .maxlen = sizeof(int), | |
2707 | .mode = 0644, | |
6d9f239a | 2708 | .proc_handler = proc_dointvec_ms_jiffies, |
d12af679 | 2709 | }, |
1da177e4 | 2710 | { |
1da177e4 LT |
2711 | .procname = "gc_interval", |
2712 | .maxlen = sizeof(int), | |
2713 | .mode = 0644, | |
6d9f239a | 2714 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
2715 | }, |
2716 | { | |
1da177e4 LT |
2717 | .procname = "gc_thresh1", |
2718 | .maxlen = sizeof(int), | |
2719 | .mode = 0644, | |
6d9f239a | 2720 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2721 | }, |
2722 | { | |
1da177e4 LT |
2723 | .procname = "gc_thresh2", |
2724 | .maxlen = sizeof(int), | |
2725 | .mode = 0644, | |
6d9f239a | 2726 | .proc_handler = proc_dointvec, |
1da177e4 LT |
2727 | }, |
2728 | { | |
1da177e4 LT |
2729 | .procname = "gc_thresh3", |
2730 | .maxlen = sizeof(int), | |
2731 | .mode = 0644, | |
6d9f239a | 2732 | .proc_handler = proc_dointvec, |
1da177e4 | 2733 | }, |
c3bac5a7 | 2734 | {}, |
1da177e4 LT |
2735 | }, |
2736 | }; | |
2737 | ||
2738 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
54716e3b | 2739 | char *p_name, proc_handler *handler) |
1da177e4 | 2740 | { |
3c607bbb | 2741 | struct neigh_sysctl_table *t; |
1da177e4 | 2742 | const char *dev_name_source = NULL; |
c3bac5a7 PE |
2743 | |
2744 | #define NEIGH_CTL_PATH_ROOT 0 | |
2745 | #define NEIGH_CTL_PATH_PROTO 1 | |
2746 | #define NEIGH_CTL_PATH_NEIGH 2 | |
2747 | #define NEIGH_CTL_PATH_DEV 3 | |
2748 | ||
2749 | struct ctl_path neigh_path[] = { | |
f8572d8f EB |
2750 | { .procname = "net", }, |
2751 | { .procname = "proto", }, | |
2752 | { .procname = "neigh", }, | |
2753 | { .procname = "default", }, | |
c3bac5a7 PE |
2754 | { }, |
2755 | }; | |
1da177e4 | 2756 | |
3c607bbb | 2757 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 2758 | if (!t) |
3c607bbb PE |
2759 | goto err; |
2760 | ||
1da177e4 LT |
2761 | t->neigh_vars[0].data = &p->mcast_probes; |
2762 | t->neigh_vars[1].data = &p->ucast_probes; | |
2763 | t->neigh_vars[2].data = &p->app_probes; | |
2764 | t->neigh_vars[3].data = &p->retrans_time; | |
2765 | t->neigh_vars[4].data = &p->base_reachable_time; | |
2766 | t->neigh_vars[5].data = &p->delay_probe_time; | |
2767 | t->neigh_vars[6].data = &p->gc_staletime; | |
2768 | t->neigh_vars[7].data = &p->queue_len; | |
2769 | t->neigh_vars[8].data = &p->proxy_qlen; | |
2770 | t->neigh_vars[9].data = &p->anycast_delay; | |
2771 | t->neigh_vars[10].data = &p->proxy_delay; | |
2772 | t->neigh_vars[11].data = &p->locktime; | |
d12af679 EB |
2773 | t->neigh_vars[12].data = &p->retrans_time; |
2774 | t->neigh_vars[13].data = &p->base_reachable_time; | |
1da177e4 LT |
2775 | |
2776 | if (dev) { | |
2777 | dev_name_source = dev->name; | |
d12af679 EB |
2778 | /* Terminate the table early */ |
2779 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); | |
1da177e4 | 2780 | } else { |
c3bac5a7 | 2781 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
d12af679 EB |
2782 | t->neigh_vars[14].data = (int *)(p + 1); |
2783 | t->neigh_vars[15].data = (int *)(p + 1) + 1; | |
2784 | t->neigh_vars[16].data = (int *)(p + 1) + 2; | |
2785 | t->neigh_vars[17].data = (int *)(p + 1) + 3; | |
1da177e4 LT |
2786 | } |
2787 | ||
1da177e4 | 2788 | |
f8572d8f | 2789 | if (handler) { |
1da177e4 LT |
2790 | /* RetransTime */ |
2791 | t->neigh_vars[3].proc_handler = handler; | |
1da177e4 LT |
2792 | t->neigh_vars[3].extra1 = dev; |
2793 | /* ReachableTime */ | |
2794 | t->neigh_vars[4].proc_handler = handler; | |
1da177e4 LT |
2795 | t->neigh_vars[4].extra1 = dev; |
2796 | /* RetransTime (in milliseconds)*/ | |
d12af679 | 2797 | t->neigh_vars[12].proc_handler = handler; |
d12af679 | 2798 | t->neigh_vars[12].extra1 = dev; |
1da177e4 | 2799 | /* ReachableTime (in milliseconds) */ |
d12af679 | 2800 | t->neigh_vars[13].proc_handler = handler; |
d12af679 | 2801 | t->neigh_vars[13].extra1 = dev; |
1da177e4 LT |
2802 | } |
2803 | ||
c3bac5a7 PE |
2804 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
2805 | if (!t->dev_name) | |
1da177e4 | 2806 | goto free; |
1da177e4 | 2807 | |
c3bac5a7 | 2808 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
c3bac5a7 | 2809 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; |
1da177e4 | 2810 | |
4ab438fc | 2811 | t->sysctl_header = |
57da52c1 | 2812 | register_net_sysctl_table(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 2813 | if (!t->sysctl_header) |
1da177e4 | 2814 | goto free_procname; |
3c607bbb | 2815 | |
1da177e4 LT |
2816 | p->sysctl_table = t; |
2817 | return 0; | |
2818 | ||
3c607bbb | 2819 | free_procname: |
c3bac5a7 | 2820 | kfree(t->dev_name); |
3c607bbb | 2821 | free: |
1da177e4 | 2822 | kfree(t); |
3c607bbb PE |
2823 | err: |
2824 | return -ENOBUFS; | |
1da177e4 | 2825 | } |
0a204500 | 2826 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
2827 | |
2828 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
2829 | { | |
2830 | if (p->sysctl_table) { | |
2831 | struct neigh_sysctl_table *t = p->sysctl_table; | |
2832 | p->sysctl_table = NULL; | |
2833 | unregister_sysctl_table(t->sysctl_header); | |
c3bac5a7 | 2834 | kfree(t->dev_name); |
1da177e4 LT |
2835 | kfree(t); |
2836 | } | |
2837 | } | |
0a204500 | 2838 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
2839 | |
2840 | #endif /* CONFIG_SYSCTL */ | |
2841 | ||
c8822a4e TG |
2842 | static int __init neigh_init(void) |
2843 | { | |
c7ac8679 GR |
2844 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
2845 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); | |
2846 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); | |
c8822a4e | 2847 | |
c7ac8679 GR |
2848 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
2849 | NULL); | |
2850 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); | |
c8822a4e TG |
2851 | |
2852 | return 0; | |
2853 | } | |
2854 | ||
2855 | subsys_initcall(neigh_init); | |
2856 |