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 | ||
e005d193 JP |
18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
19 | ||
5a0e3ad6 | 20 | #include <linux/slab.h> |
1da177e4 LT |
21 | #include <linux/types.h> |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/socket.h> | |
1da177e4 LT |
25 | #include <linux/netdevice.h> |
26 | #include <linux/proc_fs.h> | |
27 | #ifdef CONFIG_SYSCTL | |
28 | #include <linux/sysctl.h> | |
29 | #endif | |
30 | #include <linux/times.h> | |
457c4cbc | 31 | #include <net/net_namespace.h> |
1da177e4 LT |
32 | #include <net/neighbour.h> |
33 | #include <net/dst.h> | |
34 | #include <net/sock.h> | |
8d71740c | 35 | #include <net/netevent.h> |
a14a49d2 | 36 | #include <net/netlink.h> |
1da177e4 LT |
37 | #include <linux/rtnetlink.h> |
38 | #include <linux/random.h> | |
543537bd | 39 | #include <linux/string.h> |
c3609d51 | 40 | #include <linux/log2.h> |
1d4c8c29 | 41 | #include <linux/inetdevice.h> |
bba24896 | 42 | #include <net/addrconf.h> |
1da177e4 | 43 | |
d5d427cd | 44 | #define DEBUG |
1da177e4 | 45 | #define NEIGH_DEBUG 1 |
d5d427cd JP |
46 | #define neigh_dbg(level, fmt, ...) \ |
47 | do { \ | |
48 | if (level <= NEIGH_DEBUG) \ | |
49 | pr_debug(fmt, ##__VA_ARGS__); \ | |
50 | } while (0) | |
1da177e4 LT |
51 | |
52 | #define PNEIGH_HASHMASK 0xF | |
53 | ||
54 | static void neigh_timer_handler(unsigned long arg); | |
d961db35 TG |
55 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
56 | static void neigh_update_notify(struct neighbour *neigh); | |
1da177e4 | 57 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
1da177e4 | 58 | |
45fc3b11 | 59 | #ifdef CONFIG_PROC_FS |
9a32144e | 60 | static const struct file_operations neigh_stat_seq_fops; |
45fc3b11 | 61 | #endif |
1da177e4 LT |
62 | |
63 | /* | |
64 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
65 | ||
66 | - All the scans/updates to hash buckets MUST be made under this lock. | |
67 | - NOTHING clever should be made under this lock: no callbacks | |
68 | to protocol backends, no attempts to send something to network. | |
69 | It will result in deadlocks, if backend/driver wants to use neighbour | |
70 | cache. | |
71 | - If the entry requires some non-trivial actions, increase | |
72 | its reference count and release table lock. | |
73 | ||
74 | Neighbour entries are protected: | |
75 | - with reference count. | |
76 | - with rwlock neigh->lock | |
77 | ||
78 | Reference count prevents destruction. | |
79 | ||
80 | neigh->lock mainly serializes ll address data and its validity state. | |
81 | However, the same lock is used to protect another entry fields: | |
82 | - timer | |
83 | - resolution queue | |
84 | ||
85 | Again, nothing clever shall be made under neigh->lock, | |
86 | the most complicated procedure, which we allow is dev->hard_header. | |
87 | It is supposed, that dev->hard_header is simplistic and does | |
88 | not make callbacks to neighbour tables. | |
1da177e4 LT |
89 | */ |
90 | ||
8f40b161 | 91 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
92 | { |
93 | kfree_skb(skb); | |
94 | return -ENETDOWN; | |
95 | } | |
96 | ||
4f494554 TG |
97 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
98 | { | |
99 | if (neigh->parms->neigh_cleanup) | |
100 | neigh->parms->neigh_cleanup(neigh); | |
101 | ||
d961db35 | 102 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
4f494554 TG |
103 | neigh_release(neigh); |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
108 | * It corresponds to default IPv6 settings and is not overridable, | |
109 | * because it is really reasonable choice. | |
110 | */ | |
111 | ||
112 | unsigned long neigh_rand_reach_time(unsigned long base) | |
113 | { | |
63862b5b | 114 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 115 | } |
0a204500 | 116 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 LT |
117 | |
118 | ||
119 | static int neigh_forced_gc(struct neigh_table *tbl) | |
120 | { | |
121 | int shrunk = 0; | |
122 | int i; | |
d6bf7817 | 123 | struct neigh_hash_table *nht; |
1da177e4 LT |
124 | |
125 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
126 | ||
127 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
128 | nht = rcu_dereference_protected(tbl->nht, |
129 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 130 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
131 | struct neighbour *n; |
132 | struct neighbour __rcu **np; | |
1da177e4 | 133 | |
d6bf7817 | 134 | np = &nht->hash_buckets[i]; |
767e97e1 ED |
135 | while ((n = rcu_dereference_protected(*np, |
136 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
137 | /* Neighbour record may be discarded if: |
138 | * - nobody refers to it. | |
139 | * - it is not permanent | |
140 | */ | |
141 | write_lock(&n->lock); | |
142 | if (atomic_read(&n->refcnt) == 1 && | |
143 | !(n->nud_state & NUD_PERMANENT)) { | |
767e97e1 ED |
144 | rcu_assign_pointer(*np, |
145 | rcu_dereference_protected(n->next, | |
146 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
147 | n->dead = 1; |
148 | shrunk = 1; | |
149 | write_unlock(&n->lock); | |
4f494554 | 150 | neigh_cleanup_and_release(n); |
1da177e4 LT |
151 | continue; |
152 | } | |
153 | write_unlock(&n->lock); | |
154 | np = &n->next; | |
155 | } | |
156 | } | |
157 | ||
158 | tbl->last_flush = jiffies; | |
159 | ||
160 | write_unlock_bh(&tbl->lock); | |
161 | ||
162 | return shrunk; | |
163 | } | |
164 | ||
a43d8994 PE |
165 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
166 | { | |
167 | neigh_hold(n); | |
168 | if (unlikely(mod_timer(&n->timer, when))) { | |
169 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
170 | n->nud_state); | |
171 | dump_stack(); | |
172 | } | |
173 | } | |
174 | ||
1da177e4 LT |
175 | static int neigh_del_timer(struct neighbour *n) |
176 | { | |
177 | if ((n->nud_state & NUD_IN_TIMER) && | |
178 | del_timer(&n->timer)) { | |
179 | neigh_release(n); | |
180 | return 1; | |
181 | } | |
182 | return 0; | |
183 | } | |
184 | ||
185 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
186 | { | |
187 | struct sk_buff *skb; | |
188 | ||
189 | while ((skb = skb_dequeue(list)) != NULL) { | |
190 | dev_put(skb->dev); | |
191 | kfree_skb(skb); | |
192 | } | |
193 | } | |
194 | ||
49636bb1 | 195 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
196 | { |
197 | int i; | |
d6bf7817 | 198 | struct neigh_hash_table *nht; |
1da177e4 | 199 | |
d6bf7817 ED |
200 | nht = rcu_dereference_protected(tbl->nht, |
201 | lockdep_is_held(&tbl->lock)); | |
202 | ||
cd089336 | 203 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
204 | struct neighbour *n; |
205 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 206 | |
767e97e1 ED |
207 | while ((n = rcu_dereference_protected(*np, |
208 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
209 | if (dev && n->dev != dev) { |
210 | np = &n->next; | |
211 | continue; | |
212 | } | |
767e97e1 ED |
213 | rcu_assign_pointer(*np, |
214 | rcu_dereference_protected(n->next, | |
215 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
216 | write_lock(&n->lock); |
217 | neigh_del_timer(n); | |
218 | n->dead = 1; | |
219 | ||
220 | if (atomic_read(&n->refcnt) != 1) { | |
221 | /* The most unpleasant situation. | |
222 | We must destroy neighbour entry, | |
223 | but someone still uses it. | |
224 | ||
225 | The destroy will be delayed until | |
226 | the last user releases us, but | |
227 | we must kill timers etc. and move | |
228 | it to safe state. | |
229 | */ | |
c9ab4d85 | 230 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 231 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
232 | n->output = neigh_blackhole; |
233 | if (n->nud_state & NUD_VALID) | |
234 | n->nud_state = NUD_NOARP; | |
235 | else | |
236 | n->nud_state = NUD_NONE; | |
d5d427cd | 237 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
238 | } |
239 | write_unlock(&n->lock); | |
4f494554 | 240 | neigh_cleanup_and_release(n); |
1da177e4 LT |
241 | } |
242 | } | |
49636bb1 | 243 | } |
1da177e4 | 244 | |
49636bb1 HX |
245 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
246 | { | |
247 | write_lock_bh(&tbl->lock); | |
248 | neigh_flush_dev(tbl, dev); | |
249 | write_unlock_bh(&tbl->lock); | |
250 | } | |
0a204500 | 251 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 HX |
252 | |
253 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
254 | { | |
255 | write_lock_bh(&tbl->lock); | |
256 | neigh_flush_dev(tbl, dev); | |
1da177e4 LT |
257 | pneigh_ifdown(tbl, dev); |
258 | write_unlock_bh(&tbl->lock); | |
259 | ||
260 | del_timer_sync(&tbl->proxy_timer); | |
261 | pneigh_queue_purge(&tbl->proxy_queue); | |
262 | return 0; | |
263 | } | |
0a204500 | 264 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 265 | |
596b9b68 | 266 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device *dev) |
1da177e4 LT |
267 | { |
268 | struct neighbour *n = NULL; | |
269 | unsigned long now = jiffies; | |
270 | int entries; | |
271 | ||
272 | entries = atomic_inc_return(&tbl->entries) - 1; | |
273 | if (entries >= tbl->gc_thresh3 || | |
274 | (entries >= tbl->gc_thresh2 && | |
275 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
276 | if (!neigh_forced_gc(tbl) && | |
277 | entries >= tbl->gc_thresh3) | |
278 | goto out_entries; | |
279 | } | |
280 | ||
08433eff | 281 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
282 | if (!n) |
283 | goto out_entries; | |
284 | ||
c9ab4d85 | 285 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 286 | rwlock_init(&n->lock); |
0ed8ddf4 | 287 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
288 | n->updated = n->used = now; |
289 | n->nud_state = NUD_NONE; | |
290 | n->output = neigh_blackhole; | |
f6b72b62 | 291 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 292 | n->parms = neigh_parms_clone(&tbl->parms); |
b24b8a24 | 293 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
1da177e4 LT |
294 | |
295 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
296 | n->tbl = tbl; | |
297 | atomic_set(&n->refcnt, 1); | |
298 | n->dead = 1; | |
299 | out: | |
300 | return n; | |
301 | ||
302 | out_entries: | |
303 | atomic_dec(&tbl->entries); | |
304 | goto out; | |
305 | } | |
306 | ||
2c2aba6c DM |
307 | static void neigh_get_hash_rnd(u32 *x) |
308 | { | |
309 | get_random_bytes(x, sizeof(*x)); | |
310 | *x |= 1; | |
311 | } | |
312 | ||
cd089336 | 313 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 314 | { |
cd089336 | 315 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 316 | struct neigh_hash_table *ret; |
6193d2be | 317 | struct neighbour __rcu **buckets; |
2c2aba6c | 318 | int i; |
1da177e4 | 319 | |
d6bf7817 ED |
320 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
321 | if (!ret) | |
322 | return NULL; | |
323 | if (size <= PAGE_SIZE) | |
324 | buckets = kzalloc(size, GFP_ATOMIC); | |
325 | else | |
6193d2be | 326 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
327 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
328 | get_order(size)); | |
329 | if (!buckets) { | |
330 | kfree(ret); | |
331 | return NULL; | |
1da177e4 | 332 | } |
6193d2be | 333 | ret->hash_buckets = buckets; |
cd089336 | 334 | ret->hash_shift = shift; |
2c2aba6c DM |
335 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
336 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
337 | return ret; |
338 | } | |
339 | ||
d6bf7817 | 340 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 341 | { |
d6bf7817 ED |
342 | struct neigh_hash_table *nht = container_of(head, |
343 | struct neigh_hash_table, | |
344 | rcu); | |
cd089336 | 345 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 346 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 LT |
347 | |
348 | if (size <= PAGE_SIZE) | |
d6bf7817 | 349 | kfree(buckets); |
1da177e4 | 350 | else |
d6bf7817 ED |
351 | free_pages((unsigned long)buckets, get_order(size)); |
352 | kfree(nht); | |
1da177e4 LT |
353 | } |
354 | ||
d6bf7817 | 355 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 356 | unsigned long new_shift) |
1da177e4 | 357 | { |
d6bf7817 ED |
358 | unsigned int i, hash; |
359 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
360 | |
361 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
362 | ||
d6bf7817 ED |
363 | old_nht = rcu_dereference_protected(tbl->nht, |
364 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 365 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
366 | if (!new_nht) |
367 | return old_nht; | |
1da177e4 | 368 | |
cd089336 | 369 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
370 | struct neighbour *n, *next; |
371 | ||
767e97e1 ED |
372 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
373 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
374 | n != NULL; |
375 | n = next) { | |
376 | hash = tbl->hash(n->primary_key, n->dev, | |
377 | new_nht->hash_rnd); | |
1da177e4 | 378 | |
cd089336 | 379 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
380 | next = rcu_dereference_protected(n->next, |
381 | lockdep_is_held(&tbl->lock)); | |
382 | ||
383 | rcu_assign_pointer(n->next, | |
384 | rcu_dereference_protected( | |
385 | new_nht->hash_buckets[hash], | |
386 | lockdep_is_held(&tbl->lock))); | |
387 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
388 | } |
389 | } | |
1da177e4 | 390 | |
d6bf7817 ED |
391 | rcu_assign_pointer(tbl->nht, new_nht); |
392 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
393 | return new_nht; | |
1da177e4 LT |
394 | } |
395 | ||
396 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
397 | struct net_device *dev) | |
398 | { | |
399 | struct neighbour *n; | |
4ec93edb | 400 | |
1da177e4 LT |
401 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
402 | ||
d6bf7817 | 403 | rcu_read_lock_bh(); |
60395a20 EB |
404 | n = __neigh_lookup_noref(tbl, pkey, dev); |
405 | if (n) { | |
406 | if (!atomic_inc_not_zero(&n->refcnt)) | |
407 | n = NULL; | |
408 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 409 | } |
767e97e1 | 410 | |
d6bf7817 | 411 | rcu_read_unlock_bh(); |
1da177e4 LT |
412 | return n; |
413 | } | |
0a204500 | 414 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 415 | |
426b5303 EB |
416 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
417 | const void *pkey) | |
1da177e4 LT |
418 | { |
419 | struct neighbour *n; | |
420 | int key_len = tbl->key_len; | |
bc4bf5f3 | 421 | u32 hash_val; |
d6bf7817 | 422 | struct neigh_hash_table *nht; |
1da177e4 LT |
423 | |
424 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
425 | ||
d6bf7817 ED |
426 | rcu_read_lock_bh(); |
427 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 428 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
429 | |
430 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
431 | n != NULL; | |
432 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 433 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 434 | net_eq(dev_net(n->dev), net)) { |
767e97e1 ED |
435 | if (!atomic_inc_not_zero(&n->refcnt)) |
436 | n = NULL; | |
1da177e4 LT |
437 | NEIGH_CACHE_STAT_INC(tbl, hits); |
438 | break; | |
439 | } | |
440 | } | |
767e97e1 | 441 | |
d6bf7817 | 442 | rcu_read_unlock_bh(); |
1da177e4 LT |
443 | return n; |
444 | } | |
0a204500 | 445 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 446 | |
a263b309 DM |
447 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
448 | struct net_device *dev, bool want_ref) | |
1da177e4 LT |
449 | { |
450 | u32 hash_val; | |
451 | int key_len = tbl->key_len; | |
452 | int error; | |
596b9b68 | 453 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
d6bf7817 | 454 | struct neigh_hash_table *nht; |
1da177e4 LT |
455 | |
456 | if (!n) { | |
457 | rc = ERR_PTR(-ENOBUFS); | |
458 | goto out; | |
459 | } | |
460 | ||
461 | memcpy(n->primary_key, pkey, key_len); | |
462 | n->dev = dev; | |
463 | dev_hold(dev); | |
464 | ||
465 | /* Protocol specific setup. */ | |
466 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
467 | rc = ERR_PTR(error); | |
468 | goto out_neigh_release; | |
469 | } | |
470 | ||
da6a8fa0 DM |
471 | if (dev->netdev_ops->ndo_neigh_construct) { |
472 | error = dev->netdev_ops->ndo_neigh_construct(n); | |
473 | if (error < 0) { | |
474 | rc = ERR_PTR(error); | |
475 | goto out_neigh_release; | |
476 | } | |
477 | } | |
478 | ||
447f2191 DM |
479 | /* Device specific setup. */ |
480 | if (n->parms->neigh_setup && | |
481 | (error = n->parms->neigh_setup(n)) < 0) { | |
482 | rc = ERR_PTR(error); | |
483 | goto out_neigh_release; | |
484 | } | |
485 | ||
1f9248e5 | 486 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
487 | |
488 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
489 | nht = rcu_dereference_protected(tbl->nht, |
490 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 491 | |
cd089336 DM |
492 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
493 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 494 | |
cd089336 | 495 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
496 | |
497 | if (n->parms->dead) { | |
498 | rc = ERR_PTR(-EINVAL); | |
499 | goto out_tbl_unlock; | |
500 | } | |
501 | ||
767e97e1 ED |
502 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
503 | lockdep_is_held(&tbl->lock)); | |
504 | n1 != NULL; | |
505 | n1 = rcu_dereference_protected(n1->next, | |
506 | lockdep_is_held(&tbl->lock))) { | |
1da177e4 | 507 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
a263b309 DM |
508 | if (want_ref) |
509 | neigh_hold(n1); | |
1da177e4 LT |
510 | rc = n1; |
511 | goto out_tbl_unlock; | |
512 | } | |
513 | } | |
514 | ||
1da177e4 | 515 | n->dead = 0; |
a263b309 DM |
516 | if (want_ref) |
517 | neigh_hold(n); | |
767e97e1 ED |
518 | rcu_assign_pointer(n->next, |
519 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
520 | lockdep_is_held(&tbl->lock))); | |
521 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 522 | write_unlock_bh(&tbl->lock); |
d5d427cd | 523 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
524 | rc = n; |
525 | out: | |
526 | return rc; | |
527 | out_tbl_unlock: | |
528 | write_unlock_bh(&tbl->lock); | |
529 | out_neigh_release: | |
530 | neigh_release(n); | |
531 | goto out; | |
532 | } | |
a263b309 | 533 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 534 | |
be01d655 | 535 | static u32 pneigh_hash(const void *pkey, int key_len) |
fa86d322 | 536 | { |
fa86d322 | 537 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
538 | hash_val ^= (hash_val >> 16); |
539 | hash_val ^= hash_val >> 8; | |
540 | hash_val ^= hash_val >> 4; | |
541 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
542 | return hash_val; |
543 | } | |
fa86d322 | 544 | |
be01d655 YH |
545 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
546 | struct net *net, | |
547 | const void *pkey, | |
548 | int key_len, | |
549 | struct net_device *dev) | |
550 | { | |
551 | while (n) { | |
fa86d322 | 552 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 553 | net_eq(pneigh_net(n), net) && |
fa86d322 | 554 | (n->dev == dev || !n->dev)) |
be01d655 YH |
555 | return n; |
556 | n = n->next; | |
fa86d322 | 557 | } |
be01d655 YH |
558 | return NULL; |
559 | } | |
fa86d322 | 560 | |
be01d655 YH |
561 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
562 | struct net *net, const void *pkey, struct net_device *dev) | |
563 | { | |
564 | int key_len = tbl->key_len; | |
565 | u32 hash_val = pneigh_hash(pkey, key_len); | |
566 | ||
567 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
568 | net, pkey, key_len, dev); | |
fa86d322 | 569 | } |
0a204500 | 570 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 571 | |
426b5303 EB |
572 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
573 | struct net *net, const void *pkey, | |
1da177e4 LT |
574 | struct net_device *dev, int creat) |
575 | { | |
576 | struct pneigh_entry *n; | |
577 | int key_len = tbl->key_len; | |
be01d655 | 578 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
579 | |
580 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
581 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
582 | net, pkey, key_len, dev); | |
1da177e4 | 583 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
584 | |
585 | if (n || !creat) | |
1da177e4 LT |
586 | goto out; |
587 | ||
4ae28944 PE |
588 | ASSERT_RTNL(); |
589 | ||
1da177e4 LT |
590 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
591 | if (!n) | |
592 | goto out; | |
593 | ||
efd7ef1c | 594 | write_pnet(&n->net, net); |
1da177e4 LT |
595 | memcpy(n->key, pkey, key_len); |
596 | n->dev = dev; | |
597 | if (dev) | |
598 | dev_hold(dev); | |
599 | ||
600 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
601 | if (dev) | |
602 | dev_put(dev); | |
603 | kfree(n); | |
604 | n = NULL; | |
605 | goto out; | |
606 | } | |
607 | ||
608 | write_lock_bh(&tbl->lock); | |
609 | n->next = tbl->phash_buckets[hash_val]; | |
610 | tbl->phash_buckets[hash_val] = n; | |
611 | write_unlock_bh(&tbl->lock); | |
612 | out: | |
613 | return n; | |
614 | } | |
0a204500 | 615 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
616 | |
617 | ||
426b5303 | 618 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
619 | struct net_device *dev) |
620 | { | |
621 | struct pneigh_entry *n, **np; | |
622 | int key_len = tbl->key_len; | |
be01d655 | 623 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
624 | |
625 | write_lock_bh(&tbl->lock); | |
626 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
627 | np = &n->next) { | |
426b5303 | 628 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 629 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
630 | *np = n->next; |
631 | write_unlock_bh(&tbl->lock); | |
632 | if (tbl->pdestructor) | |
633 | tbl->pdestructor(n); | |
634 | if (n->dev) | |
635 | dev_put(n->dev); | |
636 | kfree(n); | |
637 | return 0; | |
638 | } | |
639 | } | |
640 | write_unlock_bh(&tbl->lock); | |
641 | return -ENOENT; | |
642 | } | |
643 | ||
644 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
645 | { | |
646 | struct pneigh_entry *n, **np; | |
647 | u32 h; | |
648 | ||
649 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
650 | np = &tbl->phash_buckets[h]; | |
651 | while ((n = *np) != NULL) { | |
652 | if (!dev || n->dev == dev) { | |
653 | *np = n->next; | |
654 | if (tbl->pdestructor) | |
655 | tbl->pdestructor(n); | |
656 | if (n->dev) | |
657 | dev_put(n->dev); | |
658 | kfree(n); | |
659 | continue; | |
660 | } | |
661 | np = &n->next; | |
662 | } | |
663 | } | |
664 | return -ENOENT; | |
665 | } | |
666 | ||
06f0511d DL |
667 | static void neigh_parms_destroy(struct neigh_parms *parms); |
668 | ||
669 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
670 | { | |
671 | if (atomic_dec_and_test(&parms->refcnt)) | |
672 | neigh_parms_destroy(parms); | |
673 | } | |
1da177e4 LT |
674 | |
675 | /* | |
676 | * neighbour must already be out of the table; | |
677 | * | |
678 | */ | |
679 | void neigh_destroy(struct neighbour *neigh) | |
680 | { | |
da6a8fa0 DM |
681 | struct net_device *dev = neigh->dev; |
682 | ||
1da177e4 LT |
683 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
684 | ||
685 | if (!neigh->dead) { | |
e005d193 | 686 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
687 | dump_stack(); |
688 | return; | |
689 | } | |
690 | ||
691 | if (neigh_del_timer(neigh)) | |
e005d193 | 692 | pr_warn("Impossible event\n"); |
1da177e4 | 693 | |
c9ab4d85 ED |
694 | write_lock_bh(&neigh->lock); |
695 | __skb_queue_purge(&neigh->arp_queue); | |
696 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 697 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 698 | |
447f2191 DM |
699 | if (dev->netdev_ops->ndo_neigh_destroy) |
700 | dev->netdev_ops->ndo_neigh_destroy(neigh); | |
701 | ||
da6a8fa0 | 702 | dev_put(dev); |
1da177e4 LT |
703 | neigh_parms_put(neigh->parms); |
704 | ||
d5d427cd | 705 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
706 | |
707 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 708 | kfree_rcu(neigh, rcu); |
1da177e4 | 709 | } |
0a204500 | 710 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
711 | |
712 | /* Neighbour state is suspicious; | |
713 | disable fast path. | |
714 | ||
715 | Called with write_locked neigh. | |
716 | */ | |
717 | static void neigh_suspect(struct neighbour *neigh) | |
718 | { | |
d5d427cd | 719 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
720 | |
721 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
722 | } |
723 | ||
724 | /* Neighbour state is OK; | |
725 | enable fast path. | |
726 | ||
727 | Called with write_locked neigh. | |
728 | */ | |
729 | static void neigh_connect(struct neighbour *neigh) | |
730 | { | |
d5d427cd | 731 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
732 | |
733 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
734 | } |
735 | ||
e4c4e448 | 736 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 737 | { |
e4c4e448 | 738 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
739 | struct neighbour *n; |
740 | struct neighbour __rcu **np; | |
e4c4e448 | 741 | unsigned int i; |
d6bf7817 | 742 | struct neigh_hash_table *nht; |
1da177e4 LT |
743 | |
744 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
745 | ||
e4c4e448 | 746 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
747 | nht = rcu_dereference_protected(tbl->nht, |
748 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
749 | |
750 | /* | |
751 | * periodically recompute ReachableTime from random function | |
752 | */ | |
753 | ||
e4c4e448 | 754 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 755 | struct neigh_parms *p; |
e4c4e448 | 756 | tbl->last_rand = jiffies; |
75fbfd33 | 757 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 758 | p->reachable_time = |
1f9248e5 | 759 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
760 | } |
761 | ||
feff9ab2 DJ |
762 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
763 | goto out; | |
764 | ||
cd089336 | 765 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 766 | np = &nht->hash_buckets[i]; |
1da177e4 | 767 | |
767e97e1 ED |
768 | while ((n = rcu_dereference_protected(*np, |
769 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 770 | unsigned int state; |
1da177e4 | 771 | |
e4c4e448 | 772 | write_lock(&n->lock); |
1da177e4 | 773 | |
e4c4e448 ED |
774 | state = n->nud_state; |
775 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { | |
776 | write_unlock(&n->lock); | |
777 | goto next_elt; | |
778 | } | |
1da177e4 | 779 | |
e4c4e448 ED |
780 | if (time_before(n->used, n->confirmed)) |
781 | n->used = n->confirmed; | |
1da177e4 | 782 | |
e4c4e448 ED |
783 | if (atomic_read(&n->refcnt) == 1 && |
784 | (state == NUD_FAILED || | |
1f9248e5 | 785 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 ED |
786 | *np = n->next; |
787 | n->dead = 1; | |
788 | write_unlock(&n->lock); | |
789 | neigh_cleanup_and_release(n); | |
790 | continue; | |
791 | } | |
1da177e4 | 792 | write_unlock(&n->lock); |
1da177e4 LT |
793 | |
794 | next_elt: | |
e4c4e448 ED |
795 | np = &n->next; |
796 | } | |
797 | /* | |
798 | * It's fine to release lock here, even if hash table | |
799 | * grows while we are preempted. | |
800 | */ | |
801 | write_unlock_bh(&tbl->lock); | |
802 | cond_resched(); | |
803 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
804 | nht = rcu_dereference_protected(tbl->nht, |
805 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 806 | } |
2724680b | 807 | out: |
1f9248e5 JP |
808 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
809 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
810 | * BASE_REACHABLE_TIME. | |
1da177e4 | 811 | */ |
f618002b | 812 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 813 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 814 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
815 | } |
816 | ||
817 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
818 | { | |
819 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
820 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
821 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
822 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
823 | } |
824 | ||
5ef12d98 | 825 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
826 | __releases(neigh->lock) |
827 | __acquires(neigh->lock) | |
5ef12d98 TT |
828 | { |
829 | struct sk_buff *skb; | |
830 | ||
831 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 832 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
833 | neigh->updated = jiffies; |
834 | ||
835 | /* It is very thin place. report_unreachable is very complicated | |
836 | routine. Particularly, it can hit the same neighbour entry! | |
837 | ||
838 | So that, we try to be accurate and avoid dead loop. --ANK | |
839 | */ | |
840 | while (neigh->nud_state == NUD_FAILED && | |
841 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
842 | write_unlock(&neigh->lock); | |
843 | neigh->ops->error_report(neigh, skb); | |
844 | write_lock(&neigh->lock); | |
845 | } | |
c9ab4d85 | 846 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 847 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
848 | } |
849 | ||
cd28ca0a ED |
850 | static void neigh_probe(struct neighbour *neigh) |
851 | __releases(neigh->lock) | |
852 | { | |
4ed377e3 | 853 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
854 | /* keep skb alive even if arp_queue overflows */ |
855 | if (skb) | |
856 | skb = skb_copy(skb, GFP_ATOMIC); | |
857 | write_unlock(&neigh->lock); | |
858 | neigh->ops->solicit(neigh, skb); | |
859 | atomic_inc(&neigh->probes); | |
860 | kfree_skb(skb); | |
861 | } | |
862 | ||
1da177e4 LT |
863 | /* Called when a timer expires for a neighbour entry. */ |
864 | ||
865 | static void neigh_timer_handler(unsigned long arg) | |
866 | { | |
867 | unsigned long now, next; | |
868 | struct neighbour *neigh = (struct neighbour *)arg; | |
95c96174 | 869 | unsigned int state; |
1da177e4 LT |
870 | int notify = 0; |
871 | ||
872 | write_lock(&neigh->lock); | |
873 | ||
874 | state = neigh->nud_state; | |
875 | now = jiffies; | |
876 | next = now + HZ; | |
877 | ||
045f7b3b | 878 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 879 | goto out; |
1da177e4 LT |
880 | |
881 | if (state & NUD_REACHABLE) { | |
4ec93edb | 882 | if (time_before_eq(now, |
1da177e4 | 883 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 884 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
885 | next = neigh->confirmed + neigh->parms->reachable_time; |
886 | } else if (time_before_eq(now, | |
1f9248e5 JP |
887 | neigh->used + |
888 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 889 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 890 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 891 | neigh->updated = jiffies; |
1da177e4 | 892 | neigh_suspect(neigh); |
1f9248e5 | 893 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 894 | } else { |
d5d427cd | 895 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 896 | neigh->nud_state = NUD_STALE; |
955aaa2f | 897 | neigh->updated = jiffies; |
1da177e4 | 898 | neigh_suspect(neigh); |
8d71740c | 899 | notify = 1; |
1da177e4 LT |
900 | } |
901 | } else if (state & NUD_DELAY) { | |
4ec93edb | 902 | if (time_before_eq(now, |
1f9248e5 JP |
903 | neigh->confirmed + |
904 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 905 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 906 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 907 | neigh->updated = jiffies; |
1da177e4 | 908 | neigh_connect(neigh); |
8d71740c | 909 | notify = 1; |
1da177e4 LT |
910 | next = neigh->confirmed + neigh->parms->reachable_time; |
911 | } else { | |
d5d427cd | 912 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 913 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 914 | neigh->updated = jiffies; |
1da177e4 | 915 | atomic_set(&neigh->probes, 0); |
765c9c63 | 916 | notify = 1; |
1f9248e5 | 917 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
918 | } |
919 | } else { | |
920 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
1f9248e5 | 921 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
922 | } |
923 | ||
924 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
925 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
926 | neigh->nud_state = NUD_FAILED; |
927 | notify = 1; | |
5ef12d98 | 928 | neigh_invalidate(neigh); |
5e2c21dc | 929 | goto out; |
1da177e4 LT |
930 | } |
931 | ||
932 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
933 | if (time_before(next, jiffies + HZ/2)) |
934 | next = jiffies + HZ/2; | |
6fb9974f HX |
935 | if (!mod_timer(&neigh->timer, next)) |
936 | neigh_hold(neigh); | |
1da177e4 LT |
937 | } |
938 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 939 | neigh_probe(neigh); |
9ff56607 | 940 | } else { |
69cc64d8 | 941 | out: |
9ff56607 DM |
942 | write_unlock(&neigh->lock); |
943 | } | |
d961db35 | 944 | |
8d71740c | 945 | if (notify) |
d961db35 | 946 | neigh_update_notify(neigh); |
1da177e4 | 947 | |
1da177e4 LT |
948 | neigh_release(neigh); |
949 | } | |
950 | ||
951 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
952 | { | |
953 | int rc; | |
cd28ca0a | 954 | bool immediate_probe = false; |
1da177e4 LT |
955 | |
956 | write_lock_bh(&neigh->lock); | |
957 | ||
958 | rc = 0; | |
959 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
960 | goto out_unlock_bh; | |
2c51a97f JA |
961 | if (neigh->dead) |
962 | goto out_dead; | |
1da177e4 | 963 | |
1da177e4 | 964 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
965 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
966 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
967 | unsigned long next, now = jiffies; |
968 | ||
1f9248e5 JP |
969 | atomic_set(&neigh->probes, |
970 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
1da177e4 | 971 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 972 | neigh->updated = now; |
1f9248e5 JP |
973 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
974 | HZ/2); | |
cd28ca0a ED |
975 | neigh_add_timer(neigh, next); |
976 | immediate_probe = true; | |
1da177e4 LT |
977 | } else { |
978 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 979 | neigh->updated = jiffies; |
1da177e4 LT |
980 | write_unlock_bh(&neigh->lock); |
981 | ||
f3fbbe0f | 982 | kfree_skb(skb); |
1da177e4 LT |
983 | return 1; |
984 | } | |
985 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 986 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 987 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 988 | neigh->updated = jiffies; |
1f9248e5 JP |
989 | neigh_add_timer(neigh, jiffies + |
990 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
991 | } |
992 | ||
993 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
994 | if (skb) { | |
8b5c171b | 995 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 996 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 997 | struct sk_buff *buff; |
8b5c171b | 998 | |
f72051b0 | 999 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1000 | if (!buff) |
1001 | break; | |
1002 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1003 | kfree_skb(buff); |
9a6d276e | 1004 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1005 | } |
a4731138 | 1006 | skb_dst_force(skb); |
1da177e4 | 1007 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1008 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1009 | } |
1010 | rc = 1; | |
1011 | } | |
1012 | out_unlock_bh: | |
cd28ca0a ED |
1013 | if (immediate_probe) |
1014 | neigh_probe(neigh); | |
1015 | else | |
1016 | write_unlock(&neigh->lock); | |
1017 | local_bh_enable(); | |
1da177e4 | 1018 | return rc; |
2c51a97f JA |
1019 | |
1020 | out_dead: | |
1021 | if (neigh->nud_state & NUD_STALE) | |
1022 | goto out_unlock_bh; | |
1023 | write_unlock_bh(&neigh->lock); | |
1024 | kfree_skb(skb); | |
1025 | return 1; | |
1da177e4 | 1026 | } |
0a204500 | 1027 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1028 | |
f6b72b62 | 1029 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1030 | { |
1031 | struct hh_cache *hh; | |
3b04ddde | 1032 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1033 | = NULL; |
1034 | ||
1035 | if (neigh->dev->header_ops) | |
1036 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1037 | |
1038 | if (update) { | |
f6b72b62 DM |
1039 | hh = &neigh->hh; |
1040 | if (hh->hh_len) { | |
3644f0ce | 1041 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1042 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1043 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1044 | } |
1045 | } | |
1046 | } | |
1047 | ||
1048 | ||
1049 | ||
1050 | /* Generic update routine. | |
1051 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1052 | -- new is new state. | |
1053 | -- flags | |
1054 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1055 | if it is different. | |
1056 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1057 | lladdr instead of overriding it |
1da177e4 LT |
1058 | if it is different. |
1059 | It also allows to retain current state | |
1060 | if lladdr is unchanged. | |
1061 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. | |
1062 | ||
4ec93edb | 1063 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1064 | NTF_ROUTER flag. |
1065 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1066 | a router. | |
1067 | ||
1068 | Caller MUST hold reference count on the entry. | |
1069 | */ | |
1070 | ||
1071 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1072 | u32 flags) | |
1073 | { | |
1074 | u8 old; | |
1075 | int err; | |
1da177e4 | 1076 | int notify = 0; |
1da177e4 LT |
1077 | struct net_device *dev; |
1078 | int update_isrouter = 0; | |
1079 | ||
1080 | write_lock_bh(&neigh->lock); | |
1081 | ||
1082 | dev = neigh->dev; | |
1083 | old = neigh->nud_state; | |
1084 | err = -EPERM; | |
1085 | ||
4ec93edb | 1086 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1087 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1088 | goto out; | |
2c51a97f JA |
1089 | if (neigh->dead) |
1090 | goto out; | |
1da177e4 LT |
1091 | |
1092 | if (!(new & NUD_VALID)) { | |
1093 | neigh_del_timer(neigh); | |
1094 | if (old & NUD_CONNECTED) | |
1095 | neigh_suspect(neigh); | |
1096 | neigh->nud_state = new; | |
1097 | err = 0; | |
1da177e4 | 1098 | notify = old & NUD_VALID; |
5ef12d98 TT |
1099 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
1100 | (new & NUD_FAILED)) { | |
1101 | neigh_invalidate(neigh); | |
1102 | notify = 1; | |
1103 | } | |
1da177e4 LT |
1104 | goto out; |
1105 | } | |
1106 | ||
1107 | /* Compare new lladdr with cached one */ | |
1108 | if (!dev->addr_len) { | |
1109 | /* First case: device needs no address. */ | |
1110 | lladdr = neigh->ha; | |
1111 | } else if (lladdr) { | |
1112 | /* The second case: if something is already cached | |
1113 | and a new address is proposed: | |
1114 | - compare new & old | |
1115 | - if they are different, check override flag | |
1116 | */ | |
4ec93edb | 1117 | if ((old & NUD_VALID) && |
1da177e4 LT |
1118 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1119 | lladdr = neigh->ha; | |
1120 | } else { | |
1121 | /* No address is supplied; if we know something, | |
1122 | use it, otherwise discard the request. | |
1123 | */ | |
1124 | err = -EINVAL; | |
1125 | if (!(old & NUD_VALID)) | |
1126 | goto out; | |
1127 | lladdr = neigh->ha; | |
1128 | } | |
1129 | ||
1130 | if (new & NUD_CONNECTED) | |
1131 | neigh->confirmed = jiffies; | |
1132 | neigh->updated = jiffies; | |
1133 | ||
1134 | /* If entry was valid and address is not changed, | |
1135 | do not change entry state, if new one is STALE. | |
1136 | */ | |
1137 | err = 0; | |
1138 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1139 | if (old & NUD_VALID) { | |
1140 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1141 | update_isrouter = 0; | |
1142 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1143 | (old & NUD_CONNECTED)) { | |
1144 | lladdr = neigh->ha; | |
1145 | new = NUD_STALE; | |
1146 | } else | |
1147 | goto out; | |
1148 | } else { | |
1149 | if (lladdr == neigh->ha && new == NUD_STALE && | |
1150 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || | |
1151 | (old & NUD_CONNECTED)) | |
1152 | ) | |
1153 | new = old; | |
1154 | } | |
1155 | } | |
1156 | ||
1157 | if (new != old) { | |
1158 | neigh_del_timer(neigh); | |
765c9c63 EK |
1159 | if (new & NUD_PROBE) |
1160 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1161 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1162 | neigh_add_timer(neigh, (jiffies + |
1163 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1164 | neigh->parms->reachable_time : |
1165 | 0))); | |
1da177e4 | 1166 | neigh->nud_state = new; |
53385d2d | 1167 | notify = 1; |
1da177e4 LT |
1168 | } |
1169 | ||
1170 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1171 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1172 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1173 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1174 | neigh_update_hhs(neigh); |
1175 | if (!(new & NUD_CONNECTED)) | |
1176 | neigh->confirmed = jiffies - | |
1f9248e5 | 1177 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1178 | notify = 1; |
1da177e4 LT |
1179 | } |
1180 | if (new == old) | |
1181 | goto out; | |
1182 | if (new & NUD_CONNECTED) | |
1183 | neigh_connect(neigh); | |
1184 | else | |
1185 | neigh_suspect(neigh); | |
1186 | if (!(old & NUD_VALID)) { | |
1187 | struct sk_buff *skb; | |
1188 | ||
1189 | /* Again: avoid dead loop if something went wrong */ | |
1190 | ||
1191 | while (neigh->nud_state & NUD_VALID && | |
1192 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1193 | struct dst_entry *dst = skb_dst(skb); |
1194 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1195 | write_unlock_bh(&neigh->lock); |
e049f288 | 1196 | |
1197 | rcu_read_lock(); | |
13a43d94 DM |
1198 | |
1199 | /* Why not just use 'neigh' as-is? The problem is that | |
1200 | * things such as shaper, eql, and sch_teql can end up | |
1201 | * using alternative, different, neigh objects to output | |
1202 | * the packet in the output path. So what we need to do | |
1203 | * here is re-lookup the top-level neigh in the path so | |
1204 | * we can reinject the packet there. | |
1205 | */ | |
1206 | n2 = NULL; | |
1207 | if (dst) { | |
1208 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1209 | if (n2) | |
1210 | n1 = n2; | |
1211 | } | |
8f40b161 | 1212 | n1->output(n1, skb); |
13a43d94 DM |
1213 | if (n2) |
1214 | neigh_release(n2); | |
e049f288 | 1215 | rcu_read_unlock(); |
1216 | ||
1da177e4 LT |
1217 | write_lock_bh(&neigh->lock); |
1218 | } | |
c9ab4d85 | 1219 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1220 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1221 | } |
1222 | out: | |
1223 | if (update_isrouter) { | |
1224 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? | |
1225 | (neigh->flags | NTF_ROUTER) : | |
1226 | (neigh->flags & ~NTF_ROUTER); | |
1227 | } | |
1228 | write_unlock_bh(&neigh->lock); | |
8d71740c TT |
1229 | |
1230 | if (notify) | |
d961db35 TG |
1231 | neigh_update_notify(neigh); |
1232 | ||
1da177e4 LT |
1233 | return err; |
1234 | } | |
0a204500 | 1235 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1236 | |
7e980569 JB |
1237 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1238 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1239 | */ | |
1240 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1241 | { | |
2c51a97f JA |
1242 | if (neigh->dead) |
1243 | return; | |
7e980569 JB |
1244 | neigh->updated = jiffies; |
1245 | if (!(neigh->nud_state & NUD_FAILED)) | |
1246 | return; | |
2176d5d4 DJ |
1247 | neigh->nud_state = NUD_INCOMPLETE; |
1248 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 JB |
1249 | neigh_add_timer(neigh, |
1250 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); | |
1251 | } | |
1252 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1253 | ||
1da177e4 LT |
1254 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1255 | u8 *lladdr, void *saddr, | |
1256 | struct net_device *dev) | |
1257 | { | |
1258 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1259 | lladdr || !dev->addr_len); | |
1260 | if (neigh) | |
4ec93edb | 1261 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1262 | NEIGH_UPDATE_F_OVERRIDE); |
1263 | return neigh; | |
1264 | } | |
0a204500 | 1265 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1266 | |
34d101dd | 1267 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1268 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1269 | { |
bdf53c58 EB |
1270 | struct net_device *dev = n->dev; |
1271 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1272 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1273 | |
1274 | write_lock_bh(&n->lock); | |
34d101dd | 1275 | |
f6b72b62 DM |
1276 | /* Only one thread can come in here and initialize the |
1277 | * hh_cache entry. | |
1278 | */ | |
b23b5455 DM |
1279 | if (!hh->hh_len) |
1280 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1281 | |
0ed8ddf4 | 1282 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1283 | } |
1284 | ||
1da177e4 LT |
1285 | /* Slow and careful. */ |
1286 | ||
8f40b161 | 1287 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1288 | { |
1da177e4 LT |
1289 | int rc = 0; |
1290 | ||
1da177e4 LT |
1291 | if (!neigh_event_send(neigh, skb)) { |
1292 | int err; | |
1293 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1294 | unsigned int seq; |
34d101dd | 1295 | |
f6b72b62 | 1296 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
bdf53c58 | 1297 | neigh_hh_init(neigh); |
34d101dd | 1298 | |
0ed8ddf4 | 1299 | do { |
e1f16503 | 1300 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1301 | seq = read_seqbegin(&neigh->ha_lock); |
1302 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1303 | neigh->ha, NULL, skb->len); | |
1304 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1305 | |
1da177e4 | 1306 | if (err >= 0) |
542d4d68 | 1307 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1308 | else |
1309 | goto out_kfree_skb; | |
1310 | } | |
1311 | out: | |
1312 | return rc; | |
1da177e4 LT |
1313 | out_kfree_skb: |
1314 | rc = -EINVAL; | |
1315 | kfree_skb(skb); | |
1316 | goto out; | |
1317 | } | |
0a204500 | 1318 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1319 | |
1320 | /* As fast as possible without hh cache */ | |
1321 | ||
8f40b161 | 1322 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1323 | { |
1da177e4 | 1324 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1325 | unsigned int seq; |
8f40b161 | 1326 | int err; |
1da177e4 | 1327 | |
0ed8ddf4 | 1328 | do { |
e1f16503 | 1329 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1330 | seq = read_seqbegin(&neigh->ha_lock); |
1331 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1332 | neigh->ha, NULL, skb->len); | |
1333 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1334 | ||
1da177e4 | 1335 | if (err >= 0) |
542d4d68 | 1336 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1337 | else { |
1338 | err = -EINVAL; | |
1339 | kfree_skb(skb); | |
1340 | } | |
1341 | return err; | |
1342 | } | |
0a204500 | 1343 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1344 | |
8f40b161 DM |
1345 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1346 | { | |
1347 | return dev_queue_xmit(skb); | |
1348 | } | |
1349 | EXPORT_SYMBOL(neigh_direct_output); | |
1350 | ||
1da177e4 LT |
1351 | static void neigh_proxy_process(unsigned long arg) |
1352 | { | |
1353 | struct neigh_table *tbl = (struct neigh_table *)arg; | |
1354 | long sched_next = 0; | |
1355 | unsigned long now = jiffies; | |
f72051b0 | 1356 | struct sk_buff *skb, *n; |
1da177e4 LT |
1357 | |
1358 | spin_lock(&tbl->proxy_queue.lock); | |
1359 | ||
f72051b0 DM |
1360 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1361 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1362 | |
1da177e4 | 1363 | if (tdif <= 0) { |
f72051b0 | 1364 | struct net_device *dev = skb->dev; |
20e6074e | 1365 | |
f72051b0 | 1366 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1367 | if (tbl->proxy_redo && netif_running(dev)) { |
1368 | rcu_read_lock(); | |
f72051b0 | 1369 | tbl->proxy_redo(skb); |
20e6074e ED |
1370 | rcu_read_unlock(); |
1371 | } else { | |
f72051b0 | 1372 | kfree_skb(skb); |
20e6074e | 1373 | } |
1da177e4 LT |
1374 | |
1375 | dev_put(dev); | |
1376 | } else if (!sched_next || tdif < sched_next) | |
1377 | sched_next = tdif; | |
1378 | } | |
1379 | del_timer(&tbl->proxy_timer); | |
1380 | if (sched_next) | |
1381 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1382 | spin_unlock(&tbl->proxy_queue.lock); | |
1383 | } | |
1384 | ||
1385 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1386 | struct sk_buff *skb) | |
1387 | { | |
1388 | unsigned long now = jiffies; | |
63862b5b AH |
1389 | |
1390 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1391 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1392 | |
1f9248e5 | 1393 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1394 | kfree_skb(skb); |
1395 | return; | |
1396 | } | |
a61bbcf2 PM |
1397 | |
1398 | NEIGH_CB(skb)->sched_next = sched_next; | |
1399 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1400 | |
1401 | spin_lock(&tbl->proxy_queue.lock); | |
1402 | if (del_timer(&tbl->proxy_timer)) { | |
1403 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1404 | sched_next = tbl->proxy_timer.expires; | |
1405 | } | |
adf30907 | 1406 | skb_dst_drop(skb); |
1da177e4 LT |
1407 | dev_hold(skb->dev); |
1408 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1409 | mod_timer(&tbl->proxy_timer, sched_next); | |
1410 | spin_unlock(&tbl->proxy_queue.lock); | |
1411 | } | |
0a204500 | 1412 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1413 | |
97fd5bc7 | 1414 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1415 | struct net *net, int ifindex) |
1416 | { | |
1417 | struct neigh_parms *p; | |
1418 | ||
75fbfd33 | 1419 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1420 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1421 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1422 | return p; |
1423 | } | |
1424 | ||
1425 | return NULL; | |
1426 | } | |
1da177e4 LT |
1427 | |
1428 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1429 | struct neigh_table *tbl) | |
1430 | { | |
cf89d6b2 | 1431 | struct neigh_parms *p; |
00829823 SH |
1432 | struct net *net = dev_net(dev); |
1433 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1434 | |
cf89d6b2 | 1435 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1436 | if (p) { |
1da177e4 LT |
1437 | p->tbl = tbl; |
1438 | atomic_set(&p->refcnt, 1); | |
1da177e4 | 1439 | p->reachable_time = |
1f9248e5 | 1440 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1441 | dev_hold(dev); |
1442 | p->dev = dev; | |
efd7ef1c | 1443 | write_pnet(&p->net, net); |
63134803 | 1444 | p->sysctl_table = NULL; |
c7fb64db | 1445 | |
00829823 | 1446 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1447 | dev_put(dev); |
486b51d3 DL |
1448 | kfree(p); |
1449 | return NULL; | |
1da177e4 | 1450 | } |
486b51d3 | 1451 | |
1da177e4 | 1452 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1453 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1454 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1455 | |
1456 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1457 | } |
1458 | return p; | |
1459 | } | |
0a204500 | 1460 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1461 | |
1462 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1463 | { | |
1464 | struct neigh_parms *parms = | |
1465 | container_of(head, struct neigh_parms, rcu_head); | |
1466 | ||
1467 | neigh_parms_put(parms); | |
1468 | } | |
1469 | ||
1470 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1471 | { | |
1da177e4 LT |
1472 | if (!parms || parms == &tbl->parms) |
1473 | return; | |
1474 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1475 | list_del(&parms->list); |
1476 | parms->dead = 1; | |
1da177e4 | 1477 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1478 | if (parms->dev) |
1479 | dev_put(parms->dev); | |
1480 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1481 | } |
0a204500 | 1482 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1483 | |
06f0511d | 1484 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1485 | { |
1486 | kfree(parms); | |
1487 | } | |
1488 | ||
c2ecba71 PE |
1489 | static struct lock_class_key neigh_table_proxy_queue_class; |
1490 | ||
d7480fd3 WC |
1491 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1492 | ||
1493 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1494 | { |
1495 | unsigned long now = jiffies; | |
1496 | unsigned long phsize; | |
1497 | ||
75fbfd33 ND |
1498 | INIT_LIST_HEAD(&tbl->parms_list); |
1499 | list_add(&tbl->parms.list, &tbl->parms_list); | |
e42ea986 | 1500 | write_pnet(&tbl->parms.net, &init_net); |
1da177e4 | 1501 | atomic_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1502 | tbl->parms.reachable_time = |
1f9248e5 | 1503 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1504 | |
1da177e4 LT |
1505 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1506 | if (!tbl->stats) | |
1507 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1508 | |
1da177e4 | 1509 | #ifdef CONFIG_PROC_FS |
9b739ba5 AD |
1510 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
1511 | &neigh_stat_seq_fops, tbl)) | |
1da177e4 | 1512 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1513 | #endif |
1514 | ||
cd089336 | 1515 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1516 | |
1517 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1518 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1519 | |
d6bf7817 | 1520 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1521 | panic("cannot allocate neighbour cache hashes"); |
1522 | ||
08433eff YH |
1523 | if (!tbl->entry_size) |
1524 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1525 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1526 | else | |
1527 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1528 | ||
1da177e4 | 1529 | rwlock_init(&tbl->lock); |
203b42f7 | 1530 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1531 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1532 | tbl->parms.reachable_time); | |
b24b8a24 | 1533 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
c2ecba71 PE |
1534 | skb_queue_head_init_class(&tbl->proxy_queue, |
1535 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1536 | |
1537 | tbl->last_flush = now; | |
1538 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1539 | |
d7480fd3 | 1540 | neigh_tables[index] = tbl; |
1da177e4 | 1541 | } |
0a204500 | 1542 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1543 | |
d7480fd3 | 1544 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1545 | { |
d7480fd3 | 1546 | neigh_tables[index] = NULL; |
1da177e4 | 1547 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1548 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1549 | del_timer_sync(&tbl->proxy_timer); |
1550 | pneigh_queue_purge(&tbl->proxy_queue); | |
1551 | neigh_ifdown(tbl, NULL); | |
1552 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1553 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1554 | |
6193d2be ED |
1555 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1556 | neigh_hash_free_rcu); | |
d6bf7817 | 1557 | tbl->nht = NULL; |
1da177e4 LT |
1558 | |
1559 | kfree(tbl->phash_buckets); | |
1560 | tbl->phash_buckets = NULL; | |
1561 | ||
3f192b5c AD |
1562 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1563 | ||
3fcde74b KK |
1564 | free_percpu(tbl->stats); |
1565 | tbl->stats = NULL; | |
1566 | ||
1da177e4 LT |
1567 | return 0; |
1568 | } | |
0a204500 | 1569 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1570 | |
d7480fd3 WC |
1571 | static struct neigh_table *neigh_find_table(int family) |
1572 | { | |
1573 | struct neigh_table *tbl = NULL; | |
1574 | ||
1575 | switch (family) { | |
1576 | case AF_INET: | |
1577 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1578 | break; | |
1579 | case AF_INET6: | |
1580 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1581 | break; | |
1582 | case AF_DECnet: | |
1583 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1584 | break; | |
1585 | } | |
1586 | ||
1587 | return tbl; | |
1588 | } | |
1589 | ||
661d2967 | 1590 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1591 | { |
3b1e0a65 | 1592 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1593 | struct ndmsg *ndm; |
1594 | struct nlattr *dst_attr; | |
1da177e4 | 1595 | struct neigh_table *tbl; |
d7480fd3 | 1596 | struct neighbour *neigh; |
1da177e4 | 1597 | struct net_device *dev = NULL; |
a14a49d2 | 1598 | int err = -EINVAL; |
1da177e4 | 1599 | |
110b2499 | 1600 | ASSERT_RTNL(); |
a14a49d2 | 1601 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1602 | goto out; |
1603 | ||
a14a49d2 TG |
1604 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
1605 | if (dst_attr == NULL) | |
1606 | goto out; | |
1607 | ||
1608 | ndm = nlmsg_data(nlh); | |
1609 | if (ndm->ndm_ifindex) { | |
110b2499 | 1610 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1611 | if (dev == NULL) { |
1612 | err = -ENODEV; | |
1613 | goto out; | |
1614 | } | |
1615 | } | |
1616 | ||
d7480fd3 WC |
1617 | tbl = neigh_find_table(ndm->ndm_family); |
1618 | if (tbl == NULL) | |
1619 | return -EAFNOSUPPORT; | |
1da177e4 | 1620 | |
d7480fd3 WC |
1621 | if (nla_len(dst_attr) < tbl->key_len) |
1622 | goto out; | |
1da177e4 | 1623 | |
d7480fd3 WC |
1624 | if (ndm->ndm_flags & NTF_PROXY) { |
1625 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1626 | goto out; | |
1627 | } | |
1da177e4 | 1628 | |
d7480fd3 WC |
1629 | if (dev == NULL) |
1630 | goto out; | |
a14a49d2 | 1631 | |
d7480fd3 WC |
1632 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1633 | if (neigh == NULL) { | |
1634 | err = -ENOENT; | |
110b2499 | 1635 | goto out; |
1da177e4 | 1636 | } |
d7480fd3 WC |
1637 | |
1638 | err = neigh_update(neigh, NULL, NUD_FAILED, | |
1639 | NEIGH_UPDATE_F_OVERRIDE | | |
1640 | NEIGH_UPDATE_F_ADMIN); | |
1641 | neigh_release(neigh); | |
a14a49d2 | 1642 | |
1da177e4 LT |
1643 | out: |
1644 | return err; | |
1645 | } | |
1646 | ||
661d2967 | 1647 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 1648 | { |
d7480fd3 | 1649 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
3b1e0a65 | 1650 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1651 | struct ndmsg *ndm; |
1652 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1653 | struct neigh_table *tbl; |
1654 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1655 | struct neighbour *neigh; |
1656 | void *dst, *lladdr; | |
5208debd | 1657 | int err; |
1da177e4 | 1658 | |
110b2499 | 1659 | ASSERT_RTNL(); |
5208debd TG |
1660 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
1661 | if (err < 0) | |
1da177e4 LT |
1662 | goto out; |
1663 | ||
5208debd TG |
1664 | err = -EINVAL; |
1665 | if (tb[NDA_DST] == NULL) | |
1666 | goto out; | |
1667 | ||
1668 | ndm = nlmsg_data(nlh); | |
1669 | if (ndm->ndm_ifindex) { | |
110b2499 | 1670 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1671 | if (dev == NULL) { |
1672 | err = -ENODEV; | |
1673 | goto out; | |
1674 | } | |
1675 | ||
1676 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) | |
110b2499 | 1677 | goto out; |
5208debd TG |
1678 | } |
1679 | ||
d7480fd3 WC |
1680 | tbl = neigh_find_table(ndm->ndm_family); |
1681 | if (tbl == NULL) | |
1682 | return -EAFNOSUPPORT; | |
1da177e4 | 1683 | |
d7480fd3 WC |
1684 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
1685 | goto out; | |
1686 | dst = nla_data(tb[NDA_DST]); | |
1687 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1688 | |
d7480fd3 WC |
1689 | if (ndm->ndm_flags & NTF_PROXY) { |
1690 | struct pneigh_entry *pn; | |
1691 | ||
1692 | err = -ENOBUFS; | |
1693 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1694 | if (pn) { | |
1695 | pn->flags = ndm->ndm_flags; | |
1696 | err = 0; | |
1697 | } | |
1698 | goto out; | |
1699 | } | |
1da177e4 | 1700 | |
d7480fd3 WC |
1701 | if (dev == NULL) |
1702 | goto out; | |
62dd9318 | 1703 | |
d7480fd3 WC |
1704 | neigh = neigh_lookup(tbl, dst, dev); |
1705 | if (neigh == NULL) { | |
1706 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { | |
1707 | err = -ENOENT; | |
110b2499 | 1708 | goto out; |
1da177e4 LT |
1709 | } |
1710 | ||
d7480fd3 WC |
1711 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
1712 | if (IS_ERR(neigh)) { | |
1713 | err = PTR_ERR(neigh); | |
1714 | goto out; | |
1715 | } | |
1716 | } else { | |
1717 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1718 | err = -EEXIST; | |
1719 | neigh_release(neigh); | |
110b2499 | 1720 | goto out; |
5208debd | 1721 | } |
1da177e4 | 1722 | |
d7480fd3 WC |
1723 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
1724 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; | |
1da177e4 LT |
1725 | } |
1726 | ||
d7480fd3 WC |
1727 | if (ndm->ndm_flags & NTF_USE) { |
1728 | neigh_event_send(neigh, NULL); | |
1729 | err = 0; | |
1730 | } else | |
1731 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); | |
1732 | neigh_release(neigh); | |
1733 | ||
1da177e4 LT |
1734 | out: |
1735 | return err; | |
1736 | } | |
1737 | ||
c7fb64db TG |
1738 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1739 | { | |
ca860fb3 TG |
1740 | struct nlattr *nest; |
1741 | ||
1742 | nest = nla_nest_start(skb, NDTA_PARMS); | |
1743 | if (nest == NULL) | |
1744 | return -ENOBUFS; | |
c7fb64db | 1745 | |
9a6308d7 DM |
1746 | if ((parms->dev && |
1747 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
1748 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || | |
1f9248e5 JP |
1749 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1750 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1751 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1752 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1753 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1754 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1755 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
1756 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
1757 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
1758 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
1759 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
1760 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
1761 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
9a6308d7 DM |
1762 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time) || |
1763 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, | |
1f9248e5 JP |
1764 | NEIGH_VAR(parms, BASE_REACHABLE_TIME)) || |
1765 | nla_put_msecs(skb, NDTPA_GC_STALETIME, | |
1766 | NEIGH_VAR(parms, GC_STALETIME)) || | |
9a6308d7 | 1767 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
1f9248e5 JP |
1768 | NEIGH_VAR(parms, DELAY_PROBE_TIME)) || |
1769 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, | |
1770 | NEIGH_VAR(parms, RETRANS_TIME)) || | |
1771 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, | |
1772 | NEIGH_VAR(parms, ANYCAST_DELAY)) || | |
1773 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, | |
1774 | NEIGH_VAR(parms, PROXY_DELAY)) || | |
1775 | nla_put_msecs(skb, NDTPA_LOCKTIME, | |
1776 | NEIGH_VAR(parms, LOCKTIME))) | |
9a6308d7 | 1777 | goto nla_put_failure; |
ca860fb3 | 1778 | return nla_nest_end(skb, nest); |
c7fb64db | 1779 | |
ca860fb3 | 1780 | nla_put_failure: |
bc3ed28c TG |
1781 | nla_nest_cancel(skb, nest); |
1782 | return -EMSGSIZE; | |
c7fb64db TG |
1783 | } |
1784 | ||
ca860fb3 TG |
1785 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
1786 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
1787 | { |
1788 | struct nlmsghdr *nlh; | |
1789 | struct ndtmsg *ndtmsg; | |
1790 | ||
ca860fb3 TG |
1791 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1792 | if (nlh == NULL) | |
26932566 | 1793 | return -EMSGSIZE; |
c7fb64db | 1794 | |
ca860fb3 | 1795 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1796 | |
1797 | read_lock_bh(&tbl->lock); | |
1798 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1799 | ndtmsg->ndtm_pad1 = 0; |
1800 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1801 | |
9a6308d7 DM |
1802 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
1803 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval) || | |
1804 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || | |
1805 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
1806 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
1807 | goto nla_put_failure; | |
c7fb64db TG |
1808 | { |
1809 | unsigned long now = jiffies; | |
1810 | unsigned int flush_delta = now - tbl->last_flush; | |
1811 | unsigned int rand_delta = now - tbl->last_rand; | |
d6bf7817 | 1812 | struct neigh_hash_table *nht; |
c7fb64db TG |
1813 | struct ndt_config ndc = { |
1814 | .ndtc_key_len = tbl->key_len, | |
1815 | .ndtc_entry_size = tbl->entry_size, | |
1816 | .ndtc_entries = atomic_read(&tbl->entries), | |
1817 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
1818 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
1819 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
1820 | }; | |
1821 | ||
d6bf7817 ED |
1822 | rcu_read_lock_bh(); |
1823 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 1824 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 1825 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
1826 | rcu_read_unlock_bh(); |
1827 | ||
9a6308d7 DM |
1828 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
1829 | goto nla_put_failure; | |
c7fb64db TG |
1830 | } |
1831 | ||
1832 | { | |
1833 | int cpu; | |
1834 | struct ndt_stats ndst; | |
1835 | ||
1836 | memset(&ndst, 0, sizeof(ndst)); | |
1837 | ||
6f912042 | 1838 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
1839 | struct neigh_statistics *st; |
1840 | ||
c7fb64db TG |
1841 | st = per_cpu_ptr(tbl->stats, cpu); |
1842 | ndst.ndts_allocs += st->allocs; | |
1843 | ndst.ndts_destroys += st->destroys; | |
1844 | ndst.ndts_hash_grows += st->hash_grows; | |
1845 | ndst.ndts_res_failed += st->res_failed; | |
1846 | ndst.ndts_lookups += st->lookups; | |
1847 | ndst.ndts_hits += st->hits; | |
1848 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
1849 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
1850 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
1851 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
1852 | } | |
1853 | ||
9a6308d7 DM |
1854 | if (nla_put(skb, NDTA_STATS, sizeof(ndst), &ndst)) |
1855 | goto nla_put_failure; | |
c7fb64db TG |
1856 | } |
1857 | ||
1858 | BUG_ON(tbl->parms.dev); | |
1859 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 1860 | goto nla_put_failure; |
c7fb64db TG |
1861 | |
1862 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1863 | nlmsg_end(skb, nlh); |
1864 | return 0; | |
c7fb64db | 1865 | |
ca860fb3 | 1866 | nla_put_failure: |
c7fb64db | 1867 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1868 | nlmsg_cancel(skb, nlh); |
1869 | return -EMSGSIZE; | |
c7fb64db TG |
1870 | } |
1871 | ||
ca860fb3 TG |
1872 | static int neightbl_fill_param_info(struct sk_buff *skb, |
1873 | struct neigh_table *tbl, | |
c7fb64db | 1874 | struct neigh_parms *parms, |
ca860fb3 TG |
1875 | u32 pid, u32 seq, int type, |
1876 | unsigned int flags) | |
c7fb64db TG |
1877 | { |
1878 | struct ndtmsg *ndtmsg; | |
1879 | struct nlmsghdr *nlh; | |
1880 | ||
ca860fb3 TG |
1881 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
1882 | if (nlh == NULL) | |
26932566 | 1883 | return -EMSGSIZE; |
c7fb64db | 1884 | |
ca860fb3 | 1885 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
1886 | |
1887 | read_lock_bh(&tbl->lock); | |
1888 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
1889 | ndtmsg->ndtm_pad1 = 0; |
1890 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 1891 | |
ca860fb3 TG |
1892 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
1893 | neightbl_fill_parms(skb, parms) < 0) | |
1894 | goto errout; | |
c7fb64db TG |
1895 | |
1896 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
1897 | nlmsg_end(skb, nlh); |
1898 | return 0; | |
ca860fb3 | 1899 | errout: |
c7fb64db | 1900 | read_unlock_bh(&tbl->lock); |
26932566 PM |
1901 | nlmsg_cancel(skb, nlh); |
1902 | return -EMSGSIZE; | |
c7fb64db | 1903 | } |
4ec93edb | 1904 | |
ef7c79ed | 1905 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
1906 | [NDTA_NAME] = { .type = NLA_STRING }, |
1907 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
1908 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
1909 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
1910 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
1911 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
1912 | }; | |
1913 | ||
ef7c79ed | 1914 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
1915 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
1916 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
1917 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
1918 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
1919 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
1920 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 1921 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
1922 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
1923 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
1924 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
1925 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
1926 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
1927 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
1928 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
1929 | }; | |
1930 | ||
661d2967 | 1931 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
c7fb64db | 1932 | { |
3b1e0a65 | 1933 | struct net *net = sock_net(skb->sk); |
c7fb64db | 1934 | struct neigh_table *tbl; |
6b3f8674 TG |
1935 | struct ndtmsg *ndtmsg; |
1936 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
1937 | bool found = false; |
1938 | int err, tidx; | |
c7fb64db | 1939 | |
6b3f8674 TG |
1940 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
1941 | nl_neightbl_policy); | |
1942 | if (err < 0) | |
1943 | goto errout; | |
c7fb64db | 1944 | |
6b3f8674 TG |
1945 | if (tb[NDTA_NAME] == NULL) { |
1946 | err = -EINVAL; | |
1947 | goto errout; | |
1948 | } | |
1949 | ||
1950 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
1951 | |
1952 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
1953 | tbl = neigh_tables[tidx]; | |
1954 | if (!tbl) | |
1955 | continue; | |
c7fb64db TG |
1956 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
1957 | continue; | |
d7480fd3 WC |
1958 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
1959 | found = true; | |
c7fb64db | 1960 | break; |
d7480fd3 | 1961 | } |
c7fb64db TG |
1962 | } |
1963 | ||
d7480fd3 WC |
1964 | if (!found) |
1965 | return -ENOENT; | |
c7fb64db | 1966 | |
4ec93edb | 1967 | /* |
c7fb64db TG |
1968 | * We acquire tbl->lock to be nice to the periodic timers and |
1969 | * make sure they always see a consistent set of values. | |
1970 | */ | |
1971 | write_lock_bh(&tbl->lock); | |
1972 | ||
6b3f8674 TG |
1973 | if (tb[NDTA_PARMS]) { |
1974 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 1975 | struct neigh_parms *p; |
6b3f8674 | 1976 | int i, ifindex = 0; |
c7fb64db | 1977 | |
6b3f8674 TG |
1978 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
1979 | nl_ntbl_parm_policy); | |
1980 | if (err < 0) | |
1981 | goto errout_tbl_lock; | |
c7fb64db | 1982 | |
6b3f8674 TG |
1983 | if (tbp[NDTPA_IFINDEX]) |
1984 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 1985 | |
97fd5bc7 | 1986 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
1987 | if (p == NULL) { |
1988 | err = -ENOENT; | |
6b3f8674 | 1989 | goto errout_tbl_lock; |
c7fb64db | 1990 | } |
c7fb64db | 1991 | |
6b3f8674 TG |
1992 | for (i = 1; i <= NDTPA_MAX; i++) { |
1993 | if (tbp[i] == NULL) | |
1994 | continue; | |
c7fb64db | 1995 | |
6b3f8674 TG |
1996 | switch (i) { |
1997 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
1998 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
1999 | nla_get_u32(tbp[i]) * | |
2000 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2001 | break; |
2002 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2003 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2004 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2005 | break; |
2006 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2007 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2008 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2009 | break; |
2010 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2011 | NEIGH_VAR_SET(p, APP_PROBES, |
2012 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2013 | break; |
2014 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2015 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2016 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2017 | break; |
2018 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2019 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2020 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2021 | break; |
8da86466 YH |
2022 | case NDTPA_MCAST_REPROBES: |
2023 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2024 | nla_get_u32(tbp[i])); | |
2025 | break; | |
6b3f8674 | 2026 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2027 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2028 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2029 | /* update reachable_time as well, otherwise, the change will |
2030 | * only be effective after the next time neigh_periodic_work | |
2031 | * decides to recompute it (can be multiple minutes) | |
2032 | */ | |
2033 | p->reachable_time = | |
2034 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2035 | break; |
2036 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2037 | NEIGH_VAR_SET(p, GC_STALETIME, |
2038 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2039 | break; |
2040 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2041 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2042 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2043 | break; |
2044 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2045 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2046 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2047 | break; |
2048 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2049 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2050 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2051 | break; |
2052 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2053 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2054 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2055 | break; |
2056 | case NDTPA_LOCKTIME: | |
3977458c JP |
2057 | NEIGH_VAR_SET(p, LOCKTIME, |
2058 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2059 | break; |
2060 | } | |
2061 | } | |
2062 | } | |
c7fb64db | 2063 | |
dc25c676 G |
2064 | err = -ENOENT; |
2065 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2066 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2067 | !net_eq(net, &init_net)) | |
2068 | goto errout_tbl_lock; | |
2069 | ||
6b3f8674 TG |
2070 | if (tb[NDTA_THRESH1]) |
2071 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2072 | |
6b3f8674 TG |
2073 | if (tb[NDTA_THRESH2]) |
2074 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2075 | |
6b3f8674 TG |
2076 | if (tb[NDTA_THRESH3]) |
2077 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2078 | |
6b3f8674 TG |
2079 | if (tb[NDTA_GC_INTERVAL]) |
2080 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2081 | |
2082 | err = 0; | |
2083 | ||
6b3f8674 | 2084 | errout_tbl_lock: |
c7fb64db | 2085 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2086 | errout: |
c7fb64db TG |
2087 | return err; |
2088 | } | |
2089 | ||
c8822a4e | 2090 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2091 | { |
3b1e0a65 | 2092 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2093 | int family, tidx, nidx = 0; |
2094 | int tbl_skip = cb->args[0]; | |
2095 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2096 | struct neigh_table *tbl; |
2097 | ||
ca860fb3 | 2098 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
c7fb64db | 2099 | |
d7480fd3 | 2100 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2101 | struct neigh_parms *p; |
2102 | ||
d7480fd3 WC |
2103 | tbl = neigh_tables[tidx]; |
2104 | if (!tbl) | |
2105 | continue; | |
2106 | ||
ca860fb3 | 2107 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2108 | continue; |
2109 | ||
15e47304 | 2110 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
ca860fb3 | 2111 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2112 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2113 | break; |
2114 | ||
75fbfd33 ND |
2115 | nidx = 0; |
2116 | p = list_next_entry(&tbl->parms, list); | |
2117 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2118 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2119 | continue; |
2120 | ||
efc683fc GK |
2121 | if (nidx < neigh_skip) |
2122 | goto next; | |
c7fb64db | 2123 | |
ca860fb3 | 2124 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2125 | NETLINK_CB(cb->skb).portid, |
ca860fb3 TG |
2126 | cb->nlh->nlmsg_seq, |
2127 | RTM_NEWNEIGHTBL, | |
7b46a644 | 2128 | NLM_F_MULTI) < 0) |
c7fb64db | 2129 | goto out; |
efc683fc GK |
2130 | next: |
2131 | nidx++; | |
c7fb64db TG |
2132 | } |
2133 | ||
ca860fb3 | 2134 | neigh_skip = 0; |
c7fb64db TG |
2135 | } |
2136 | out: | |
ca860fb3 TG |
2137 | cb->args[0] = tidx; |
2138 | cb->args[1] = nidx; | |
c7fb64db TG |
2139 | |
2140 | return skb->len; | |
2141 | } | |
1da177e4 | 2142 | |
8b8aec50 TG |
2143 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2144 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2145 | { |
2146 | unsigned long now = jiffies; | |
1da177e4 | 2147 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2148 | struct nlmsghdr *nlh; |
2149 | struct ndmsg *ndm; | |
2150 | ||
2151 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2152 | if (nlh == NULL) | |
26932566 | 2153 | return -EMSGSIZE; |
1da177e4 | 2154 | |
8b8aec50 TG |
2155 | ndm = nlmsg_data(nlh); |
2156 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2157 | ndm->ndm_pad1 = 0; |
2158 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2159 | ndm->ndm_flags = neigh->flags; |
2160 | ndm->ndm_type = neigh->type; | |
2161 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2162 | |
9a6308d7 DM |
2163 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2164 | goto nla_put_failure; | |
8b8aec50 TG |
2165 | |
2166 | read_lock_bh(&neigh->lock); | |
2167 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2168 | if (neigh->nud_state & NUD_VALID) { |
2169 | char haddr[MAX_ADDR_LEN]; | |
2170 | ||
2171 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2172 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2173 | read_unlock_bh(&neigh->lock); | |
2174 | goto nla_put_failure; | |
2175 | } | |
8b8aec50 TG |
2176 | } |
2177 | ||
b9f5f52c SH |
2178 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2179 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2180 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
8b8aec50 TG |
2181 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
2182 | read_unlock_bh(&neigh->lock); | |
2183 | ||
9a6308d7 DM |
2184 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2185 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2186 | goto nla_put_failure; | |
8b8aec50 | 2187 | |
053c095a JB |
2188 | nlmsg_end(skb, nlh); |
2189 | return 0; | |
8b8aec50 TG |
2190 | |
2191 | nla_put_failure: | |
26932566 PM |
2192 | nlmsg_cancel(skb, nlh); |
2193 | return -EMSGSIZE; | |
1da177e4 LT |
2194 | } |
2195 | ||
84920c14 TZ |
2196 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2197 | u32 pid, u32 seq, int type, unsigned int flags, | |
2198 | struct neigh_table *tbl) | |
2199 | { | |
2200 | struct nlmsghdr *nlh; | |
2201 | struct ndmsg *ndm; | |
2202 | ||
2203 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2204 | if (nlh == NULL) | |
2205 | return -EMSGSIZE; | |
2206 | ||
2207 | ndm = nlmsg_data(nlh); | |
2208 | ndm->ndm_family = tbl->family; | |
2209 | ndm->ndm_pad1 = 0; | |
2210 | ndm->ndm_pad2 = 0; | |
2211 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2212 | ndm->ndm_type = RTN_UNICAST; |
84920c14 TZ |
2213 | ndm->ndm_ifindex = pn->dev->ifindex; |
2214 | ndm->ndm_state = NUD_NONE; | |
2215 | ||
9a6308d7 DM |
2216 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2217 | goto nla_put_failure; | |
84920c14 | 2218 | |
053c095a JB |
2219 | nlmsg_end(skb, nlh); |
2220 | return 0; | |
84920c14 TZ |
2221 | |
2222 | nla_put_failure: | |
2223 | nlmsg_cancel(skb, nlh); | |
2224 | return -EMSGSIZE; | |
2225 | } | |
2226 | ||
d961db35 TG |
2227 | static void neigh_update_notify(struct neighbour *neigh) |
2228 | { | |
2229 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
2230 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); | |
2231 | } | |
1da177e4 LT |
2232 | |
2233 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, | |
2234 | struct netlink_callback *cb) | |
2235 | { | |
767e97e1 | 2236 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2237 | struct neighbour *n; |
2238 | int rc, h, s_h = cb->args[1]; | |
2239 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2240 | struct neigh_hash_table *nht; |
1da177e4 | 2241 | |
d6bf7817 ED |
2242 | rcu_read_lock_bh(); |
2243 | nht = rcu_dereference_bh(tbl->nht); | |
2244 | ||
4bd6683b | 2245 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2246 | if (h > s_h) |
2247 | s_idx = 0; | |
767e97e1 ED |
2248 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2249 | n != NULL; | |
2250 | n = rcu_dereference_bh(n->next)) { | |
09ad9bc7 | 2251 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2252 | continue; |
efc683fc GK |
2253 | if (idx < s_idx) |
2254 | goto next; | |
15e47304 | 2255 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2256 | cb->nlh->nlmsg_seq, |
b6544c0b | 2257 | RTM_NEWNEIGH, |
7b46a644 | 2258 | NLM_F_MULTI) < 0) { |
1da177e4 LT |
2259 | rc = -1; |
2260 | goto out; | |
2261 | } | |
767e97e1 | 2262 | next: |
efc683fc | 2263 | idx++; |
1da177e4 | 2264 | } |
1da177e4 LT |
2265 | } |
2266 | rc = skb->len; | |
2267 | out: | |
d6bf7817 | 2268 | rcu_read_unlock_bh(); |
1da177e4 LT |
2269 | cb->args[1] = h; |
2270 | cb->args[2] = idx; | |
2271 | return rc; | |
2272 | } | |
2273 | ||
84920c14 TZ |
2274 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
2275 | struct netlink_callback *cb) | |
2276 | { | |
2277 | struct pneigh_entry *n; | |
2278 | struct net *net = sock_net(skb->sk); | |
2279 | int rc, h, s_h = cb->args[3]; | |
2280 | int idx, s_idx = idx = cb->args[4]; | |
2281 | ||
2282 | read_lock_bh(&tbl->lock); | |
2283 | ||
4bd6683b | 2284 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2285 | if (h > s_h) |
2286 | s_idx = 0; | |
2287 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
2288 | if (dev_net(n->dev) != net) | |
2289 | continue; | |
2290 | if (idx < s_idx) | |
2291 | goto next; | |
15e47304 | 2292 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 TZ |
2293 | cb->nlh->nlmsg_seq, |
2294 | RTM_NEWNEIGH, | |
7b46a644 | 2295 | NLM_F_MULTI, tbl) < 0) { |
84920c14 TZ |
2296 | read_unlock_bh(&tbl->lock); |
2297 | rc = -1; | |
2298 | goto out; | |
2299 | } | |
2300 | next: | |
2301 | idx++; | |
2302 | } | |
2303 | } | |
2304 | ||
2305 | read_unlock_bh(&tbl->lock); | |
2306 | rc = skb->len; | |
2307 | out: | |
2308 | cb->args[3] = h; | |
2309 | cb->args[4] = idx; | |
2310 | return rc; | |
2311 | ||
2312 | } | |
2313 | ||
c8822a4e | 2314 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 LT |
2315 | { |
2316 | struct neigh_table *tbl; | |
2317 | int t, family, s_t; | |
84920c14 | 2318 | int proxy = 0; |
4bd6683b | 2319 | int err; |
1da177e4 | 2320 | |
8b8aec50 | 2321 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
84920c14 TZ |
2322 | |
2323 | /* check for full ndmsg structure presence, family member is | |
2324 | * the same for both structures | |
2325 | */ | |
2326 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && | |
2327 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) | |
2328 | proxy = 1; | |
2329 | ||
1da177e4 LT |
2330 | s_t = cb->args[0]; |
2331 | ||
d7480fd3 WC |
2332 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2333 | tbl = neigh_tables[t]; | |
2334 | ||
2335 | if (!tbl) | |
2336 | continue; | |
1da177e4 LT |
2337 | if (t < s_t || (family && tbl->family != family)) |
2338 | continue; | |
2339 | if (t > s_t) | |
2340 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2341 | sizeof(cb->args[0])); | |
84920c14 TZ |
2342 | if (proxy) |
2343 | err = pneigh_dump_table(tbl, skb, cb); | |
2344 | else | |
2345 | err = neigh_dump_table(tbl, skb, cb); | |
4bd6683b ED |
2346 | if (err < 0) |
2347 | break; | |
1da177e4 | 2348 | } |
1da177e4 LT |
2349 | |
2350 | cb->args[0] = t; | |
2351 | return skb->len; | |
2352 | } | |
2353 | ||
2354 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) | |
2355 | { | |
2356 | int chain; | |
d6bf7817 | 2357 | struct neigh_hash_table *nht; |
1da177e4 | 2358 | |
d6bf7817 ED |
2359 | rcu_read_lock_bh(); |
2360 | nht = rcu_dereference_bh(tbl->nht); | |
2361 | ||
767e97e1 | 2362 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2363 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2364 | struct neighbour *n; |
2365 | ||
767e97e1 ED |
2366 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2367 | n != NULL; | |
2368 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2369 | cb(n, cookie); |
2370 | } | |
d6bf7817 ED |
2371 | read_unlock(&tbl->lock); |
2372 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2373 | } |
2374 | EXPORT_SYMBOL(neigh_for_each); | |
2375 | ||
2376 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2377 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2378 | int (*cb)(struct neighbour *)) | |
2379 | { | |
2380 | int chain; | |
d6bf7817 | 2381 | struct neigh_hash_table *nht; |
1da177e4 | 2382 | |
d6bf7817 ED |
2383 | nht = rcu_dereference_protected(tbl->nht, |
2384 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2385 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2386 | struct neighbour *n; |
2387 | struct neighbour __rcu **np; | |
1da177e4 | 2388 | |
d6bf7817 | 2389 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2390 | while ((n = rcu_dereference_protected(*np, |
2391 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2392 | int release; |
2393 | ||
2394 | write_lock(&n->lock); | |
2395 | release = cb(n); | |
2396 | if (release) { | |
767e97e1 ED |
2397 | rcu_assign_pointer(*np, |
2398 | rcu_dereference_protected(n->next, | |
2399 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
2400 | n->dead = 1; |
2401 | } else | |
2402 | np = &n->next; | |
2403 | write_unlock(&n->lock); | |
4f494554 TG |
2404 | if (release) |
2405 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2406 | } |
2407 | } | |
2408 | } | |
2409 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2410 | ||
b79bda3d | 2411 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2412 | const void *addr, struct sk_buff *skb) |
2413 | { | |
b79bda3d EB |
2414 | int err = -EAFNOSUPPORT; |
2415 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2416 | struct neigh_table *tbl; |
2417 | struct neighbour *neigh; | |
2418 | ||
b79bda3d | 2419 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2420 | if (!tbl) |
2421 | goto out; | |
2422 | neigh = __neigh_lookup_noref(tbl, addr, dev); | |
2423 | if (!neigh) | |
2424 | neigh = __neigh_create(tbl, addr, dev, false); | |
2425 | err = PTR_ERR(neigh); | |
2426 | if (IS_ERR(neigh)) | |
2427 | goto out_kfree_skb; | |
2428 | err = neigh->output(neigh, skb); | |
2429 | } | |
b79bda3d EB |
2430 | else if (index == NEIGH_LINK_TABLE) { |
2431 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
2432 | addr, NULL, skb->len); | |
2433 | if (err < 0) | |
2434 | goto out_kfree_skb; | |
2435 | err = dev_queue_xmit(skb); | |
2436 | } | |
4fd3d7d9 EB |
2437 | out: |
2438 | return err; | |
2439 | out_kfree_skb: | |
2440 | kfree_skb(skb); | |
2441 | goto out; | |
2442 | } | |
2443 | EXPORT_SYMBOL(neigh_xmit); | |
2444 | ||
1da177e4 LT |
2445 | #ifdef CONFIG_PROC_FS |
2446 | ||
2447 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
2448 | { | |
2449 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2450 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2451 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2452 | struct neighbour *n = NULL; |
2453 | int bucket = state->bucket; | |
2454 | ||
2455 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 2456 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 2457 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
2458 | |
2459 | while (n) { | |
878628fb | 2460 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2461 | goto next; |
1da177e4 LT |
2462 | if (state->neigh_sub_iter) { |
2463 | loff_t fakep = 0; | |
2464 | void *v; | |
2465 | ||
2466 | v = state->neigh_sub_iter(state, n, &fakep); | |
2467 | if (!v) | |
2468 | goto next; | |
2469 | } | |
2470 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2471 | break; | |
2472 | if (n->nud_state & ~NUD_NOARP) | |
2473 | break; | |
767e97e1 ED |
2474 | next: |
2475 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2476 | } |
2477 | ||
2478 | if (n) | |
2479 | break; | |
2480 | } | |
2481 | state->bucket = bucket; | |
2482 | ||
2483 | return n; | |
2484 | } | |
2485 | ||
2486 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
2487 | struct neighbour *n, | |
2488 | loff_t *pos) | |
2489 | { | |
2490 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2491 | struct net *net = seq_file_net(seq); |
d6bf7817 | 2492 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
2493 | |
2494 | if (state->neigh_sub_iter) { | |
2495 | void *v = state->neigh_sub_iter(state, n, pos); | |
2496 | if (v) | |
2497 | return n; | |
2498 | } | |
767e97e1 | 2499 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
2500 | |
2501 | while (1) { | |
2502 | while (n) { | |
878628fb | 2503 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 2504 | goto next; |
1da177e4 LT |
2505 | if (state->neigh_sub_iter) { |
2506 | void *v = state->neigh_sub_iter(state, n, pos); | |
2507 | if (v) | |
2508 | return n; | |
2509 | goto next; | |
2510 | } | |
2511 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
2512 | break; | |
2513 | ||
2514 | if (n->nud_state & ~NUD_NOARP) | |
2515 | break; | |
767e97e1 ED |
2516 | next: |
2517 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
2518 | } |
2519 | ||
2520 | if (n) | |
2521 | break; | |
2522 | ||
cd089336 | 2523 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
2524 | break; |
2525 | ||
767e97e1 | 2526 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
2527 | } |
2528 | ||
2529 | if (n && pos) | |
2530 | --(*pos); | |
2531 | return n; | |
2532 | } | |
2533 | ||
2534 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2535 | { | |
2536 | struct neighbour *n = neigh_get_first(seq); | |
2537 | ||
2538 | if (n) { | |
745e2031 | 2539 | --(*pos); |
1da177e4 LT |
2540 | while (*pos) { |
2541 | n = neigh_get_next(seq, n, pos); | |
2542 | if (!n) | |
2543 | break; | |
2544 | } | |
2545 | } | |
2546 | return *pos ? NULL : n; | |
2547 | } | |
2548 | ||
2549 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
2550 | { | |
2551 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2552 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2553 | struct neigh_table *tbl = state->tbl; |
2554 | struct pneigh_entry *pn = NULL; | |
2555 | int bucket = state->bucket; | |
2556 | ||
2557 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
2558 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
2559 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 2560 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2561 | pn = pn->next; |
1da177e4 LT |
2562 | if (pn) |
2563 | break; | |
2564 | } | |
2565 | state->bucket = bucket; | |
2566 | ||
2567 | return pn; | |
2568 | } | |
2569 | ||
2570 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
2571 | struct pneigh_entry *pn, | |
2572 | loff_t *pos) | |
2573 | { | |
2574 | struct neigh_seq_state *state = seq->private; | |
1218854a | 2575 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2576 | struct neigh_table *tbl = state->tbl; |
2577 | ||
df07a94c JBD |
2578 | do { |
2579 | pn = pn->next; | |
2580 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
2581 | ||
1da177e4 LT |
2582 | while (!pn) { |
2583 | if (++state->bucket > PNEIGH_HASHMASK) | |
2584 | break; | |
2585 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 2586 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 2587 | pn = pn->next; |
1da177e4 LT |
2588 | if (pn) |
2589 | break; | |
2590 | } | |
2591 | ||
2592 | if (pn && pos) | |
2593 | --(*pos); | |
2594 | ||
2595 | return pn; | |
2596 | } | |
2597 | ||
2598 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
2599 | { | |
2600 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
2601 | ||
2602 | if (pn) { | |
745e2031 | 2603 | --(*pos); |
1da177e4 LT |
2604 | while (*pos) { |
2605 | pn = pneigh_get_next(seq, pn, pos); | |
2606 | if (!pn) | |
2607 | break; | |
2608 | } | |
2609 | } | |
2610 | return *pos ? NULL : pn; | |
2611 | } | |
2612 | ||
2613 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
2614 | { | |
2615 | struct neigh_seq_state *state = seq->private; | |
2616 | void *rc; | |
745e2031 | 2617 | loff_t idxpos = *pos; |
1da177e4 | 2618 | |
745e2031 | 2619 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 2620 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 2621 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
2622 | |
2623 | return rc; | |
2624 | } | |
2625 | ||
2626 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
d6bf7817 | 2627 | __acquires(rcu_bh) |
1da177e4 LT |
2628 | { |
2629 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
2630 | |
2631 | state->tbl = tbl; | |
2632 | state->bucket = 0; | |
2633 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
2634 | ||
d6bf7817 ED |
2635 | rcu_read_lock_bh(); |
2636 | state->nht = rcu_dereference_bh(tbl->nht); | |
767e97e1 | 2637 | |
745e2031 | 2638 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
2639 | } |
2640 | EXPORT_SYMBOL(neigh_seq_start); | |
2641 | ||
2642 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2643 | { | |
2644 | struct neigh_seq_state *state; | |
2645 | void *rc; | |
2646 | ||
2647 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 2648 | rc = neigh_get_first(seq); |
1da177e4 LT |
2649 | goto out; |
2650 | } | |
2651 | ||
2652 | state = seq->private; | |
2653 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
2654 | rc = neigh_get_next(seq, v, NULL); | |
2655 | if (rc) | |
2656 | goto out; | |
2657 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
2658 | rc = pneigh_get_first(seq); | |
2659 | } else { | |
2660 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
2661 | rc = pneigh_get_next(seq, v, NULL); | |
2662 | } | |
2663 | out: | |
2664 | ++(*pos); | |
2665 | return rc; | |
2666 | } | |
2667 | EXPORT_SYMBOL(neigh_seq_next); | |
2668 | ||
2669 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
d6bf7817 | 2670 | __releases(rcu_bh) |
1da177e4 | 2671 | { |
d6bf7817 | 2672 | rcu_read_unlock_bh(); |
1da177e4 LT |
2673 | } |
2674 | EXPORT_SYMBOL(neigh_seq_stop); | |
2675 | ||
2676 | /* statistics via seq_file */ | |
2677 | ||
2678 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
2679 | { | |
81c1ebfc | 2680 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2681 | int cpu; |
2682 | ||
2683 | if (*pos == 0) | |
2684 | return SEQ_START_TOKEN; | |
4ec93edb | 2685 | |
0f23174a | 2686 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2687 | if (!cpu_possible(cpu)) |
2688 | continue; | |
2689 | *pos = cpu+1; | |
2690 | return per_cpu_ptr(tbl->stats, cpu); | |
2691 | } | |
2692 | return NULL; | |
2693 | } | |
2694 | ||
2695 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2696 | { | |
81c1ebfc | 2697 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2698 | int cpu; |
2699 | ||
0f23174a | 2700 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
2701 | if (!cpu_possible(cpu)) |
2702 | continue; | |
2703 | *pos = cpu+1; | |
2704 | return per_cpu_ptr(tbl->stats, cpu); | |
2705 | } | |
2706 | return NULL; | |
2707 | } | |
2708 | ||
2709 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
2710 | { | |
2711 | ||
2712 | } | |
2713 | ||
2714 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
2715 | { | |
81c1ebfc | 2716 | struct neigh_table *tbl = seq->private; |
1da177e4 LT |
2717 | struct neigh_statistics *st = v; |
2718 | ||
2719 | if (v == SEQ_START_TOKEN) { | |
9a6d276e | 2720 | 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 |
2721 | return 0; |
2722 | } | |
2723 | ||
2724 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
9a6d276e | 2725 | "%08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
2726 | atomic_read(&tbl->entries), |
2727 | ||
2728 | st->allocs, | |
2729 | st->destroys, | |
2730 | st->hash_grows, | |
2731 | ||
2732 | st->lookups, | |
2733 | st->hits, | |
2734 | ||
2735 | st->res_failed, | |
2736 | ||
2737 | st->rcv_probes_mcast, | |
2738 | st->rcv_probes_ucast, | |
2739 | ||
2740 | st->periodic_gc_runs, | |
9a6d276e NH |
2741 | st->forced_gc_runs, |
2742 | st->unres_discards | |
1da177e4 LT |
2743 | ); |
2744 | ||
2745 | return 0; | |
2746 | } | |
2747 | ||
f690808e | 2748 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
2749 | .start = neigh_stat_seq_start, |
2750 | .next = neigh_stat_seq_next, | |
2751 | .stop = neigh_stat_seq_stop, | |
2752 | .show = neigh_stat_seq_show, | |
2753 | }; | |
2754 | ||
2755 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) | |
2756 | { | |
2757 | int ret = seq_open(file, &neigh_stat_seq_ops); | |
2758 | ||
2759 | if (!ret) { | |
2760 | struct seq_file *sf = file->private_data; | |
d9dda78b | 2761 | sf->private = PDE_DATA(inode); |
1da177e4 LT |
2762 | } |
2763 | return ret; | |
2764 | }; | |
2765 | ||
9a32144e | 2766 | static const struct file_operations neigh_stat_seq_fops = { |
1da177e4 LT |
2767 | .owner = THIS_MODULE, |
2768 | .open = neigh_stat_seq_open, | |
2769 | .read = seq_read, | |
2770 | .llseek = seq_lseek, | |
2771 | .release = seq_release, | |
2772 | }; | |
2773 | ||
2774 | #endif /* CONFIG_PROC_FS */ | |
2775 | ||
339bf98f TG |
2776 | static inline size_t neigh_nlmsg_size(void) |
2777 | { | |
2778 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2779 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2780 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2781 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2782 | + nla_total_size(4); /* NDA_PROBES */ | |
2783 | } | |
2784 | ||
b8673311 | 2785 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
1da177e4 | 2786 | { |
c346dca1 | 2787 | struct net *net = dev_net(n->dev); |
8b8aec50 | 2788 | struct sk_buff *skb; |
b8673311 | 2789 | int err = -ENOBUFS; |
1da177e4 | 2790 | |
339bf98f | 2791 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 2792 | if (skb == NULL) |
b8673311 | 2793 | goto errout; |
1da177e4 | 2794 | |
b8673311 | 2795 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
26932566 PM |
2796 | if (err < 0) { |
2797 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
2798 | WARN_ON(err == -EMSGSIZE); | |
2799 | kfree_skb(skb); | |
2800 | goto errout; | |
2801 | } | |
1ce85fe4 PNA |
2802 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
2803 | return; | |
b8673311 TG |
2804 | errout: |
2805 | if (err < 0) | |
426b5303 | 2806 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
2807 | } |
2808 | ||
b8673311 | 2809 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 2810 | { |
b8673311 TG |
2811 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
2812 | } | |
0a204500 | 2813 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
2814 | |
2815 | #ifdef CONFIG_SYSCTL | |
b93196dc | 2816 | static int zero; |
555445cd | 2817 | static int int_max = INT_MAX; |
b93196dc | 2818 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 2819 | |
fe2c6338 JP |
2820 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
2821 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
2822 | { |
2823 | int size, ret; | |
fe2c6338 | 2824 | struct ctl_table tmp = *ctl; |
8b5c171b | 2825 | |
ce46cc64 SW |
2826 | tmp.extra1 = &zero; |
2827 | tmp.extra2 = &unres_qlen_max; | |
8b5c171b | 2828 | tmp.data = &size; |
ce46cc64 SW |
2829 | |
2830 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
2831 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
2832 | ||
8b5c171b ED |
2833 | if (write && !ret) |
2834 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
2835 | return ret; | |
2836 | } | |
2837 | ||
1d4c8c29 JP |
2838 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
2839 | int family) | |
2840 | { | |
bba24896 JP |
2841 | switch (family) { |
2842 | case AF_INET: | |
1d4c8c29 | 2843 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
2844 | case AF_INET6: |
2845 | return __in6_dev_nd_parms_get_rcu(dev); | |
2846 | } | |
1d4c8c29 JP |
2847 | return NULL; |
2848 | } | |
2849 | ||
2850 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
2851 | int index) | |
2852 | { | |
2853 | struct net_device *dev; | |
2854 | int family = neigh_parms_family(p); | |
2855 | ||
2856 | rcu_read_lock(); | |
2857 | for_each_netdev_rcu(net, dev) { | |
2858 | struct neigh_parms *dst_p = | |
2859 | neigh_get_dev_parms_rcu(dev, family); | |
2860 | ||
2861 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
2862 | dst_p->data[index] = p->data[index]; | |
2863 | } | |
2864 | rcu_read_unlock(); | |
2865 | } | |
2866 | ||
2867 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
2868 | { | |
2869 | struct net_device *dev = ctl->extra1; | |
2870 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 2871 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
2872 | int index = (int *) ctl->data - p->data; |
2873 | ||
2874 | if (!write) | |
2875 | return; | |
2876 | ||
2877 | set_bit(index, p->data_state); | |
2878 | if (!dev) /* NULL dev means this is default value */ | |
2879 | neigh_copy_dflt_parms(net, p, index); | |
2880 | } | |
2881 | ||
1f9248e5 JP |
2882 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
2883 | void __user *buffer, | |
2884 | size_t *lenp, loff_t *ppos) | |
2885 | { | |
2886 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 2887 | int ret; |
1f9248e5 JP |
2888 | |
2889 | tmp.extra1 = &zero; | |
2890 | tmp.extra2 = &int_max; | |
2891 | ||
1d4c8c29 JP |
2892 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
2893 | neigh_proc_update(ctl, write); | |
2894 | return ret; | |
1f9248e5 JP |
2895 | } |
2896 | ||
cb5b09c1 JP |
2897 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
2898 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
2899 | { | |
1d4c8c29 JP |
2900 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
2901 | ||
2902 | neigh_proc_update(ctl, write); | |
2903 | return ret; | |
cb5b09c1 JP |
2904 | } |
2905 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
2906 | ||
2907 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
2908 | void __user *buffer, | |
2909 | size_t *lenp, loff_t *ppos) | |
2910 | { | |
1d4c8c29 JP |
2911 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
2912 | ||
2913 | neigh_proc_update(ctl, write); | |
2914 | return ret; | |
cb5b09c1 JP |
2915 | } |
2916 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
2917 | ||
2918 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
2919 | void __user *buffer, | |
2920 | size_t *lenp, loff_t *ppos) | |
2921 | { | |
1d4c8c29 JP |
2922 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
2923 | ||
2924 | neigh_proc_update(ctl, write); | |
2925 | return ret; | |
cb5b09c1 JP |
2926 | } |
2927 | ||
2928 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
2929 | void __user *buffer, | |
2930 | size_t *lenp, loff_t *ppos) | |
2931 | { | |
1d4c8c29 JP |
2932 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
2933 | ||
2934 | neigh_proc_update(ctl, write); | |
2935 | return ret; | |
cb5b09c1 JP |
2936 | } |
2937 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
2938 | ||
2939 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
2940 | void __user *buffer, | |
2941 | size_t *lenp, loff_t *ppos) | |
2942 | { | |
1d4c8c29 JP |
2943 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
2944 | ||
2945 | neigh_proc_update(ctl, write); | |
2946 | return ret; | |
cb5b09c1 JP |
2947 | } |
2948 | ||
4bf6980d JFR |
2949 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
2950 | void __user *buffer, | |
2951 | size_t *lenp, loff_t *ppos) | |
2952 | { | |
2953 | struct neigh_parms *p = ctl->extra2; | |
2954 | int ret; | |
2955 | ||
2956 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
2957 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
2958 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
2959 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
2960 | else | |
2961 | ret = -1; | |
2962 | ||
2963 | if (write && ret == 0) { | |
2964 | /* update reachable_time as well, otherwise, the change will | |
2965 | * only be effective after the next time neigh_periodic_work | |
2966 | * decides to recompute it | |
2967 | */ | |
2968 | p->reachable_time = | |
2969 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
2970 | } | |
2971 | return ret; | |
2972 | } | |
2973 | ||
1f9248e5 JP |
2974 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
2975 | (&((struct neigh_parms *) 0)->data[index]) | |
2976 | ||
2977 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
2978 | [NEIGH_VAR_ ## attr] = { \ | |
2979 | .procname = name, \ | |
2980 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
2981 | .maxlen = sizeof(int), \ | |
2982 | .mode = mval, \ | |
2983 | .proc_handler = proc, \ | |
2984 | } | |
2985 | ||
2986 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
2987 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
2988 | ||
2989 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2990 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
2991 | |
2992 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2993 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 JP |
2994 | |
2995 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 2996 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
2997 | |
2998 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 2999 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3000 | |
3001 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3002 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3003 | |
1da177e4 LT |
3004 | static struct neigh_sysctl_table { |
3005 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3006 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3007 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3008 | .neigh_vars = { |
1f9248e5 JP |
3009 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3010 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3011 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3012 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3013 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3014 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3015 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3016 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3017 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3018 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3019 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3020 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3021 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3022 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3023 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3024 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3025 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3026 | .procname = "gc_interval", |
3027 | .maxlen = sizeof(int), | |
3028 | .mode = 0644, | |
6d9f239a | 3029 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3030 | }, |
8b5c171b | 3031 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3032 | .procname = "gc_thresh1", |
3033 | .maxlen = sizeof(int), | |
3034 | .mode = 0644, | |
555445cd FF |
3035 | .extra1 = &zero, |
3036 | .extra2 = &int_max, | |
3037 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3038 | }, |
8b5c171b | 3039 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3040 | .procname = "gc_thresh2", |
3041 | .maxlen = sizeof(int), | |
3042 | .mode = 0644, | |
555445cd FF |
3043 | .extra1 = &zero, |
3044 | .extra2 = &int_max, | |
3045 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3046 | }, |
8b5c171b | 3047 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3048 | .procname = "gc_thresh3", |
3049 | .maxlen = sizeof(int), | |
3050 | .mode = 0644, | |
555445cd FF |
3051 | .extra1 = &zero, |
3052 | .extra2 = &int_max, | |
3053 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 | 3054 | }, |
c3bac5a7 | 3055 | {}, |
1da177e4 LT |
3056 | }, |
3057 | }; | |
3058 | ||
3059 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3060 | proc_handler *handler) |
1da177e4 | 3061 | { |
1f9248e5 | 3062 | int i; |
3c607bbb | 3063 | struct neigh_sysctl_table *t; |
1f9248e5 | 3064 | const char *dev_name_source; |
8f40a1f9 | 3065 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3066 | char *p_name; |
1da177e4 | 3067 | |
3c607bbb | 3068 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3069 | if (!t) |
3c607bbb PE |
3070 | goto err; |
3071 | ||
b194c1f1 | 3072 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3073 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3074 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3075 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3076 | } |
1da177e4 LT |
3077 | |
3078 | if (dev) { | |
3079 | dev_name_source = dev->name; | |
d12af679 | 3080 | /* Terminate the table early */ |
8b5c171b ED |
3081 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3082 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3083 | } else { |
9ecf07a1 | 3084 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3085 | dev_name_source = "default"; |
9ecf07a1 MK |
3086 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3087 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3088 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3089 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3090 | } |
3091 | ||
f8572d8f | 3092 | if (handler) { |
1da177e4 | 3093 | /* RetransTime */ |
8b5c171b | 3094 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3095 | /* ReachableTime */ |
8b5c171b | 3096 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3097 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3098 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3099 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3100 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3101 | } else { |
3102 | /* Those handlers will update p->reachable_time after | |
3103 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3104 | * applied after the next neighbour update instead of waiting for | |
3105 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3106 | * So any handler that replaces them should do this as well | |
3107 | */ | |
3108 | /* ReachableTime */ | |
3109 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3110 | neigh_proc_base_reachable_time; | |
3111 | /* ReachableTime (in milliseconds) */ | |
3112 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3113 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3114 | } |
3115 | ||
464dc801 EB |
3116 | /* Don't export sysctls to unprivileged users */ |
3117 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3118 | t->neigh_vars[0].procname = NULL; | |
3119 | ||
73af614a JP |
3120 | switch (neigh_parms_family(p)) { |
3121 | case AF_INET: | |
3122 | p_name = "ipv4"; | |
3123 | break; | |
3124 | case AF_INET6: | |
3125 | p_name = "ipv6"; | |
3126 | break; | |
3127 | default: | |
3128 | BUG(); | |
3129 | } | |
3130 | ||
8f40a1f9 EB |
3131 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3132 | p_name, dev_name_source); | |
4ab438fc | 3133 | t->sysctl_header = |
8f40a1f9 | 3134 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3135 | if (!t->sysctl_header) |
8f40a1f9 | 3136 | goto free; |
3c607bbb | 3137 | |
1da177e4 LT |
3138 | p->sysctl_table = t; |
3139 | return 0; | |
3140 | ||
3c607bbb | 3141 | free: |
1da177e4 | 3142 | kfree(t); |
3c607bbb PE |
3143 | err: |
3144 | return -ENOBUFS; | |
1da177e4 | 3145 | } |
0a204500 | 3146 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3147 | |
3148 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3149 | { | |
3150 | if (p->sysctl_table) { | |
3151 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3152 | p->sysctl_table = NULL; | |
5dd3df10 | 3153 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3154 | kfree(t); |
3155 | } | |
3156 | } | |
0a204500 | 3157 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3158 | |
3159 | #endif /* CONFIG_SYSCTL */ | |
3160 | ||
c8822a4e TG |
3161 | static int __init neigh_init(void) |
3162 | { | |
c7ac8679 GR |
3163 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
3164 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); | |
3165 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); | |
c8822a4e | 3166 | |
c7ac8679 GR |
3167 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
3168 | NULL); | |
3169 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); | |
c8822a4e TG |
3170 | |
3171 | return 0; | |
3172 | } | |
3173 | ||
3174 | subsys_initcall(neigh_init); | |
3175 |