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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Generic address resolution entity | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
7 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
8 | * | |
1da177e4 LT |
9 | * Fixes: |
10 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. | |
11 | * Harald Welte Add neighbour cache statistics like rtstat | |
12 | */ | |
13 | ||
e005d193 JP |
14 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
15 | ||
5a0e3ad6 | 16 | #include <linux/slab.h> |
85704cb8 | 17 | #include <linux/kmemleak.h> |
1da177e4 LT |
18 | #include <linux/types.h> |
19 | #include <linux/kernel.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/socket.h> | |
1da177e4 LT |
22 | #include <linux/netdevice.h> |
23 | #include <linux/proc_fs.h> | |
24 | #ifdef CONFIG_SYSCTL | |
25 | #include <linux/sysctl.h> | |
26 | #endif | |
27 | #include <linux/times.h> | |
457c4cbc | 28 | #include <net/net_namespace.h> |
1da177e4 | 29 | #include <net/neighbour.h> |
4b2a2bfe | 30 | #include <net/arp.h> |
1da177e4 LT |
31 | #include <net/dst.h> |
32 | #include <net/sock.h> | |
8d71740c | 33 | #include <net/netevent.h> |
a14a49d2 | 34 | #include <net/netlink.h> |
1da177e4 LT |
35 | #include <linux/rtnetlink.h> |
36 | #include <linux/random.h> | |
543537bd | 37 | #include <linux/string.h> |
c3609d51 | 38 | #include <linux/log2.h> |
1d4c8c29 | 39 | #include <linux/inetdevice.h> |
bba24896 | 40 | #include <net/addrconf.h> |
1da177e4 | 41 | |
56dd18a4 RP |
42 | #include <trace/events/neigh.h> |
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 | ||
e99e88a9 | 54 | static void neigh_timer_handler(struct timer_list *t); |
7b8f7a40 RP |
55 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
56 | u32 pid); | |
57 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid); | |
53b76cdf WB |
58 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
59 | struct net_device *dev); | |
1da177e4 | 60 | |
45fc3b11 | 61 | #ifdef CONFIG_PROC_FS |
71a5053a | 62 | static const struct seq_operations neigh_stat_seq_ops; |
45fc3b11 | 63 | #endif |
1da177e4 LT |
64 | |
65 | /* | |
66 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
67 | ||
68 | - All the scans/updates to hash buckets MUST be made under this lock. | |
69 | - NOTHING clever should be made under this lock: no callbacks | |
70 | to protocol backends, no attempts to send something to network. | |
71 | It will result in deadlocks, if backend/driver wants to use neighbour | |
72 | cache. | |
73 | - If the entry requires some non-trivial actions, increase | |
74 | its reference count and release table lock. | |
75 | ||
76 | Neighbour entries are protected: | |
77 | - with reference count. | |
78 | - with rwlock neigh->lock | |
79 | ||
80 | Reference count prevents destruction. | |
81 | ||
82 | neigh->lock mainly serializes ll address data and its validity state. | |
83 | However, the same lock is used to protect another entry fields: | |
84 | - timer | |
85 | - resolution queue | |
86 | ||
87 | Again, nothing clever shall be made under neigh->lock, | |
88 | the most complicated procedure, which we allow is dev->hard_header. | |
89 | It is supposed, that dev->hard_header is simplistic and does | |
90 | not make callbacks to neighbour tables. | |
1da177e4 LT |
91 | */ |
92 | ||
8f40b161 | 93 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
94 | { |
95 | kfree_skb(skb); | |
96 | return -ENETDOWN; | |
97 | } | |
98 | ||
4f494554 TG |
99 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
100 | { | |
101 | if (neigh->parms->neigh_cleanup) | |
102 | neigh->parms->neigh_cleanup(neigh); | |
103 | ||
56dd18a4 | 104 | trace_neigh_cleanup_and_release(neigh, 0); |
7b8f7a40 | 105 | __neigh_notify(neigh, RTM_DELNEIGH, 0, 0); |
53f800e3 | 106 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
4f494554 TG |
107 | neigh_release(neigh); |
108 | } | |
109 | ||
1da177e4 LT |
110 | /* |
111 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
112 | * It corresponds to default IPv6 settings and is not overridable, | |
113 | * because it is really reasonable choice. | |
114 | */ | |
115 | ||
116 | unsigned long neigh_rand_reach_time(unsigned long base) | |
117 | { | |
63862b5b | 118 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 119 | } |
0a204500 | 120 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 | 121 | |
58956317 DA |
122 | static void neigh_mark_dead(struct neighbour *n) |
123 | { | |
124 | n->dead = 1; | |
125 | if (!list_empty(&n->gc_list)) { | |
126 | list_del_init(&n->gc_list); | |
127 | atomic_dec(&n->tbl->gc_entries); | |
128 | } | |
129 | } | |
130 | ||
9c29a2f5 | 131 | static void neigh_update_gc_list(struct neighbour *n) |
58956317 | 132 | { |
e997f8a2 | 133 | bool on_gc_list, exempt_from_gc; |
58956317 | 134 | |
9c29a2f5 DA |
135 | write_lock_bh(&n->tbl->lock); |
136 | write_lock(&n->lock); | |
58956317 | 137 | |
e997f8a2 DA |
138 | /* remove from the gc list if new state is permanent or if neighbor |
139 | * is externally learned; otherwise entry should be on the gc list | |
58956317 | 140 | */ |
e997f8a2 DA |
141 | exempt_from_gc = n->nud_state & NUD_PERMANENT || |
142 | n->flags & NTF_EXT_LEARNED; | |
9c29a2f5 DA |
143 | on_gc_list = !list_empty(&n->gc_list); |
144 | ||
e997f8a2 | 145 | if (exempt_from_gc && on_gc_list) { |
58956317 DA |
146 | list_del_init(&n->gc_list); |
147 | atomic_dec(&n->tbl->gc_entries); | |
e997f8a2 | 148 | } else if (!exempt_from_gc && !on_gc_list) { |
58956317 DA |
149 | /* add entries to the tail; cleaning removes from the front */ |
150 | list_add_tail(&n->gc_list, &n->tbl->gc_list); | |
151 | atomic_inc(&n->tbl->gc_entries); | |
152 | } | |
9c29a2f5 DA |
153 | |
154 | write_unlock(&n->lock); | |
155 | write_unlock_bh(&n->tbl->lock); | |
58956317 | 156 | } |
1da177e4 | 157 | |
e997f8a2 | 158 | static bool neigh_update_ext_learned(struct neighbour *neigh, u32 flags, |
526f1b58 DA |
159 | int *notify) |
160 | { | |
e997f8a2 | 161 | bool rc = false; |
526f1b58 DA |
162 | u8 ndm_flags; |
163 | ||
164 | if (!(flags & NEIGH_UPDATE_F_ADMIN)) | |
e997f8a2 | 165 | return rc; |
526f1b58 DA |
166 | |
167 | ndm_flags = (flags & NEIGH_UPDATE_F_EXT_LEARNED) ? NTF_EXT_LEARNED : 0; | |
168 | if ((neigh->flags ^ ndm_flags) & NTF_EXT_LEARNED) { | |
169 | if (ndm_flags & NTF_EXT_LEARNED) | |
170 | neigh->flags |= NTF_EXT_LEARNED; | |
171 | else | |
172 | neigh->flags &= ~NTF_EXT_LEARNED; | |
e997f8a2 | 173 | rc = true; |
526f1b58 DA |
174 | *notify = 1; |
175 | } | |
e997f8a2 DA |
176 | |
177 | return rc; | |
526f1b58 DA |
178 | } |
179 | ||
7e6f182b DA |
180 | static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np, |
181 | struct neigh_table *tbl) | |
5071034e SV |
182 | { |
183 | bool retval = false; | |
184 | ||
185 | write_lock(&n->lock); | |
7e6f182b | 186 | if (refcount_read(&n->refcnt) == 1) { |
5071034e SV |
187 | struct neighbour *neigh; |
188 | ||
189 | neigh = rcu_dereference_protected(n->next, | |
190 | lockdep_is_held(&tbl->lock)); | |
191 | rcu_assign_pointer(*np, neigh); | |
58956317 | 192 | neigh_mark_dead(n); |
5071034e SV |
193 | retval = true; |
194 | } | |
195 | write_unlock(&n->lock); | |
196 | if (retval) | |
197 | neigh_cleanup_and_release(n); | |
198 | return retval; | |
199 | } | |
200 | ||
201 | bool neigh_remove_one(struct neighbour *ndel, struct neigh_table *tbl) | |
202 | { | |
203 | struct neigh_hash_table *nht; | |
204 | void *pkey = ndel->primary_key; | |
205 | u32 hash_val; | |
206 | struct neighbour *n; | |
207 | struct neighbour __rcu **np; | |
208 | ||
209 | nht = rcu_dereference_protected(tbl->nht, | |
210 | lockdep_is_held(&tbl->lock)); | |
211 | hash_val = tbl->hash(pkey, ndel->dev, nht->hash_rnd); | |
212 | hash_val = hash_val >> (32 - nht->hash_shift); | |
213 | ||
214 | np = &nht->hash_buckets[hash_val]; | |
215 | while ((n = rcu_dereference_protected(*np, | |
216 | lockdep_is_held(&tbl->lock)))) { | |
217 | if (n == ndel) | |
7e6f182b | 218 | return neigh_del(n, np, tbl); |
5071034e SV |
219 | np = &n->next; |
220 | } | |
221 | return false; | |
222 | } | |
223 | ||
1da177e4 LT |
224 | static int neigh_forced_gc(struct neigh_table *tbl) |
225 | { | |
58956317 DA |
226 | int max_clean = atomic_read(&tbl->gc_entries) - tbl->gc_thresh2; |
227 | unsigned long tref = jiffies - 5 * HZ; | |
58956317 | 228 | struct neighbour *n, *tmp; |
1da177e4 | 229 | int shrunk = 0; |
1da177e4 LT |
230 | |
231 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
232 | ||
233 | write_lock_bh(&tbl->lock); | |
1da177e4 | 234 | |
58956317 DA |
235 | list_for_each_entry_safe(n, tmp, &tbl->gc_list, gc_list) { |
236 | if (refcount_read(&n->refcnt) == 1) { | |
237 | bool remove = false; | |
238 | ||
239 | write_lock(&n->lock); | |
758a7f0b | 240 | if ((n->nud_state == NUD_FAILED) || |
e997f8a2 | 241 | time_after(tref, n->updated)) |
58956317 DA |
242 | remove = true; |
243 | write_unlock(&n->lock); | |
244 | ||
245 | if (remove && neigh_remove_one(n, tbl)) | |
246 | shrunk++; | |
247 | if (shrunk >= max_clean) | |
248 | break; | |
1da177e4 LT |
249 | } |
250 | } | |
251 | ||
252 | tbl->last_flush = jiffies; | |
253 | ||
254 | write_unlock_bh(&tbl->lock); | |
255 | ||
256 | return shrunk; | |
257 | } | |
258 | ||
a43d8994 PE |
259 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
260 | { | |
261 | neigh_hold(n); | |
262 | if (unlikely(mod_timer(&n->timer, when))) { | |
263 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
264 | n->nud_state); | |
265 | dump_stack(); | |
266 | } | |
267 | } | |
268 | ||
1da177e4 LT |
269 | static int neigh_del_timer(struct neighbour *n) |
270 | { | |
271 | if ((n->nud_state & NUD_IN_TIMER) && | |
272 | del_timer(&n->timer)) { | |
273 | neigh_release(n); | |
274 | return 1; | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
280 | { | |
281 | struct sk_buff *skb; | |
282 | ||
283 | while ((skb = skb_dequeue(list)) != NULL) { | |
284 | dev_put(skb->dev); | |
285 | kfree_skb(skb); | |
286 | } | |
287 | } | |
288 | ||
859bd2ef DA |
289 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev, |
290 | bool skip_perm) | |
1da177e4 LT |
291 | { |
292 | int i; | |
d6bf7817 | 293 | struct neigh_hash_table *nht; |
1da177e4 | 294 | |
d6bf7817 ED |
295 | nht = rcu_dereference_protected(tbl->nht, |
296 | lockdep_is_held(&tbl->lock)); | |
297 | ||
cd089336 | 298 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
299 | struct neighbour *n; |
300 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 301 | |
767e97e1 ED |
302 | while ((n = rcu_dereference_protected(*np, |
303 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
304 | if (dev && n->dev != dev) { |
305 | np = &n->next; | |
306 | continue; | |
307 | } | |
859bd2ef DA |
308 | if (skip_perm && n->nud_state & NUD_PERMANENT) { |
309 | np = &n->next; | |
310 | continue; | |
311 | } | |
767e97e1 ED |
312 | rcu_assign_pointer(*np, |
313 | rcu_dereference_protected(n->next, | |
314 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
315 | write_lock(&n->lock); |
316 | neigh_del_timer(n); | |
58956317 | 317 | neigh_mark_dead(n); |
9f237430 | 318 | if (refcount_read(&n->refcnt) != 1) { |
1da177e4 LT |
319 | /* The most unpleasant situation. |
320 | We must destroy neighbour entry, | |
321 | but someone still uses it. | |
322 | ||
323 | The destroy will be delayed until | |
324 | the last user releases us, but | |
325 | we must kill timers etc. and move | |
326 | it to safe state. | |
327 | */ | |
c9ab4d85 | 328 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 329 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
330 | n->output = neigh_blackhole; |
331 | if (n->nud_state & NUD_VALID) | |
332 | n->nud_state = NUD_NOARP; | |
333 | else | |
334 | n->nud_state = NUD_NONE; | |
d5d427cd | 335 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
336 | } |
337 | write_unlock(&n->lock); | |
4f494554 | 338 | neigh_cleanup_and_release(n); |
1da177e4 LT |
339 | } |
340 | } | |
49636bb1 | 341 | } |
1da177e4 | 342 | |
49636bb1 HX |
343 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
344 | { | |
345 | write_lock_bh(&tbl->lock); | |
859bd2ef | 346 | neigh_flush_dev(tbl, dev, false); |
49636bb1 HX |
347 | write_unlock_bh(&tbl->lock); |
348 | } | |
0a204500 | 349 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 | 350 | |
859bd2ef DA |
351 | static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev, |
352 | bool skip_perm) | |
49636bb1 HX |
353 | { |
354 | write_lock_bh(&tbl->lock); | |
859bd2ef | 355 | neigh_flush_dev(tbl, dev, skip_perm); |
53b76cdf | 356 | pneigh_ifdown_and_unlock(tbl, dev); |
1da177e4 LT |
357 | |
358 | del_timer_sync(&tbl->proxy_timer); | |
359 | pneigh_queue_purge(&tbl->proxy_queue); | |
360 | return 0; | |
361 | } | |
859bd2ef DA |
362 | |
363 | int neigh_carrier_down(struct neigh_table *tbl, struct net_device *dev) | |
364 | { | |
365 | __neigh_ifdown(tbl, dev, true); | |
366 | return 0; | |
367 | } | |
368 | EXPORT_SYMBOL(neigh_carrier_down); | |
369 | ||
370 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
371 | { | |
372 | __neigh_ifdown(tbl, dev, false); | |
373 | return 0; | |
374 | } | |
0a204500 | 375 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 376 | |
58956317 DA |
377 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, |
378 | struct net_device *dev, | |
e997f8a2 | 379 | bool exempt_from_gc) |
1da177e4 LT |
380 | { |
381 | struct neighbour *n = NULL; | |
382 | unsigned long now = jiffies; | |
383 | int entries; | |
384 | ||
e997f8a2 | 385 | if (exempt_from_gc) |
58956317 DA |
386 | goto do_alloc; |
387 | ||
388 | entries = atomic_inc_return(&tbl->gc_entries) - 1; | |
1da177e4 LT |
389 | if (entries >= tbl->gc_thresh3 || |
390 | (entries >= tbl->gc_thresh2 && | |
391 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
392 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
393 | entries >= tbl->gc_thresh3) { |
394 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
395 | tbl->id); | |
396 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 397 | goto out_entries; |
fb811395 | 398 | } |
1da177e4 LT |
399 | } |
400 | ||
58956317 | 401 | do_alloc: |
08433eff | 402 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
403 | if (!n) |
404 | goto out_entries; | |
405 | ||
c9ab4d85 | 406 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 407 | rwlock_init(&n->lock); |
0ed8ddf4 | 408 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
409 | n->updated = n->used = now; |
410 | n->nud_state = NUD_NONE; | |
411 | n->output = neigh_blackhole; | |
f6b72b62 | 412 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 413 | n->parms = neigh_parms_clone(&tbl->parms); |
e99e88a9 | 414 | timer_setup(&n->timer, neigh_timer_handler, 0); |
1da177e4 LT |
415 | |
416 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
417 | n->tbl = tbl; | |
9f237430 | 418 | refcount_set(&n->refcnt, 1); |
1da177e4 | 419 | n->dead = 1; |
8cc196d6 | 420 | INIT_LIST_HEAD(&n->gc_list); |
58956317 DA |
421 | |
422 | atomic_inc(&tbl->entries); | |
1da177e4 LT |
423 | out: |
424 | return n; | |
425 | ||
426 | out_entries: | |
e997f8a2 | 427 | if (!exempt_from_gc) |
58956317 | 428 | atomic_dec(&tbl->gc_entries); |
1da177e4 LT |
429 | goto out; |
430 | } | |
431 | ||
2c2aba6c DM |
432 | static void neigh_get_hash_rnd(u32 *x) |
433 | { | |
b3d0f789 | 434 | *x = get_random_u32() | 1; |
2c2aba6c DM |
435 | } |
436 | ||
cd089336 | 437 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 438 | { |
cd089336 | 439 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 440 | struct neigh_hash_table *ret; |
6193d2be | 441 | struct neighbour __rcu **buckets; |
2c2aba6c | 442 | int i; |
1da177e4 | 443 | |
d6bf7817 ED |
444 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
445 | if (!ret) | |
446 | return NULL; | |
85704cb8 | 447 | if (size <= PAGE_SIZE) { |
d6bf7817 | 448 | buckets = kzalloc(size, GFP_ATOMIC); |
85704cb8 | 449 | } else { |
6193d2be | 450 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
451 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
452 | get_order(size)); | |
01b833ab | 453 | kmemleak_alloc(buckets, size, 1, GFP_ATOMIC); |
85704cb8 | 454 | } |
d6bf7817 ED |
455 | if (!buckets) { |
456 | kfree(ret); | |
457 | return NULL; | |
1da177e4 | 458 | } |
6193d2be | 459 | ret->hash_buckets = buckets; |
cd089336 | 460 | ret->hash_shift = shift; |
2c2aba6c DM |
461 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
462 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
463 | return ret; |
464 | } | |
465 | ||
d6bf7817 | 466 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 467 | { |
d6bf7817 ED |
468 | struct neigh_hash_table *nht = container_of(head, |
469 | struct neigh_hash_table, | |
470 | rcu); | |
cd089336 | 471 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 472 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 | 473 | |
85704cb8 | 474 | if (size <= PAGE_SIZE) { |
d6bf7817 | 475 | kfree(buckets); |
85704cb8 KK |
476 | } else { |
477 | kmemleak_free(buckets); | |
d6bf7817 | 478 | free_pages((unsigned long)buckets, get_order(size)); |
85704cb8 | 479 | } |
d6bf7817 | 480 | kfree(nht); |
1da177e4 LT |
481 | } |
482 | ||
d6bf7817 | 483 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 484 | unsigned long new_shift) |
1da177e4 | 485 | { |
d6bf7817 ED |
486 | unsigned int i, hash; |
487 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
488 | |
489 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
490 | ||
d6bf7817 ED |
491 | old_nht = rcu_dereference_protected(tbl->nht, |
492 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 493 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
494 | if (!new_nht) |
495 | return old_nht; | |
1da177e4 | 496 | |
cd089336 | 497 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
498 | struct neighbour *n, *next; |
499 | ||
767e97e1 ED |
500 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
501 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
502 | n != NULL; |
503 | n = next) { | |
504 | hash = tbl->hash(n->primary_key, n->dev, | |
505 | new_nht->hash_rnd); | |
1da177e4 | 506 | |
cd089336 | 507 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
508 | next = rcu_dereference_protected(n->next, |
509 | lockdep_is_held(&tbl->lock)); | |
510 | ||
511 | rcu_assign_pointer(n->next, | |
512 | rcu_dereference_protected( | |
513 | new_nht->hash_buckets[hash], | |
514 | lockdep_is_held(&tbl->lock))); | |
515 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
516 | } |
517 | } | |
1da177e4 | 518 | |
d6bf7817 ED |
519 | rcu_assign_pointer(tbl->nht, new_nht); |
520 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
521 | return new_nht; | |
1da177e4 LT |
522 | } |
523 | ||
524 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
525 | struct net_device *dev) | |
526 | { | |
527 | struct neighbour *n; | |
4ec93edb | 528 | |
1da177e4 LT |
529 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
530 | ||
d6bf7817 | 531 | rcu_read_lock_bh(); |
60395a20 EB |
532 | n = __neigh_lookup_noref(tbl, pkey, dev); |
533 | if (n) { | |
9f237430 | 534 | if (!refcount_inc_not_zero(&n->refcnt)) |
60395a20 EB |
535 | n = NULL; |
536 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 537 | } |
767e97e1 | 538 | |
d6bf7817 | 539 | rcu_read_unlock_bh(); |
1da177e4 LT |
540 | return n; |
541 | } | |
0a204500 | 542 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 543 | |
426b5303 EB |
544 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
545 | const void *pkey) | |
1da177e4 LT |
546 | { |
547 | struct neighbour *n; | |
01ccdf12 | 548 | unsigned int key_len = tbl->key_len; |
bc4bf5f3 | 549 | u32 hash_val; |
d6bf7817 | 550 | struct neigh_hash_table *nht; |
1da177e4 LT |
551 | |
552 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
553 | ||
d6bf7817 ED |
554 | rcu_read_lock_bh(); |
555 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 556 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
557 | |
558 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
559 | n != NULL; | |
560 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 561 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 562 | net_eq(dev_net(n->dev), net)) { |
9f237430 | 563 | if (!refcount_inc_not_zero(&n->refcnt)) |
767e97e1 | 564 | n = NULL; |
1da177e4 LT |
565 | NEIGH_CACHE_STAT_INC(tbl, hits); |
566 | break; | |
567 | } | |
568 | } | |
767e97e1 | 569 | |
d6bf7817 | 570 | rcu_read_unlock_bh(); |
1da177e4 LT |
571 | return n; |
572 | } | |
0a204500 | 573 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 574 | |
58956317 DA |
575 | static struct neighbour *___neigh_create(struct neigh_table *tbl, |
576 | const void *pkey, | |
577 | struct net_device *dev, | |
e997f8a2 | 578 | bool exempt_from_gc, bool want_ref) |
1da177e4 | 579 | { |
e997f8a2 | 580 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev, exempt_from_gc); |
1da177e4 | 581 | u32 hash_val; |
01ccdf12 | 582 | unsigned int key_len = tbl->key_len; |
1da177e4 | 583 | int error; |
d6bf7817 | 584 | struct neigh_hash_table *nht; |
1da177e4 | 585 | |
fc651001 DA |
586 | trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc); |
587 | ||
1da177e4 LT |
588 | if (!n) { |
589 | rc = ERR_PTR(-ENOBUFS); | |
590 | goto out; | |
591 | } | |
592 | ||
593 | memcpy(n->primary_key, pkey, key_len); | |
594 | n->dev = dev; | |
595 | dev_hold(dev); | |
596 | ||
597 | /* Protocol specific setup. */ | |
598 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
599 | rc = ERR_PTR(error); | |
600 | goto out_neigh_release; | |
601 | } | |
602 | ||
da6a8fa0 | 603 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 604 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
605 | if (error < 0) { |
606 | rc = ERR_PTR(error); | |
607 | goto out_neigh_release; | |
608 | } | |
609 | } | |
610 | ||
447f2191 DM |
611 | /* Device specific setup. */ |
612 | if (n->parms->neigh_setup && | |
613 | (error = n->parms->neigh_setup(n)) < 0) { | |
614 | rc = ERR_PTR(error); | |
615 | goto out_neigh_release; | |
616 | } | |
617 | ||
1f9248e5 | 618 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
619 | |
620 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
621 | nht = rcu_dereference_protected(tbl->nht, |
622 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 623 | |
cd089336 DM |
624 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
625 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 626 | |
096b9854 | 627 | hash_val = tbl->hash(n->primary_key, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
628 | |
629 | if (n->parms->dead) { | |
630 | rc = ERR_PTR(-EINVAL); | |
631 | goto out_tbl_unlock; | |
632 | } | |
633 | ||
767e97e1 ED |
634 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
635 | lockdep_is_held(&tbl->lock)); | |
636 | n1 != NULL; | |
637 | n1 = rcu_dereference_protected(n1->next, | |
638 | lockdep_is_held(&tbl->lock))) { | |
096b9854 | 639 | if (dev == n1->dev && !memcmp(n1->primary_key, n->primary_key, key_len)) { |
a263b309 DM |
640 | if (want_ref) |
641 | neigh_hold(n1); | |
1da177e4 LT |
642 | rc = n1; |
643 | goto out_tbl_unlock; | |
644 | } | |
645 | } | |
646 | ||
1da177e4 | 647 | n->dead = 0; |
e997f8a2 | 648 | if (!exempt_from_gc) |
8cc196d6 DA |
649 | list_add_tail(&n->gc_list, &n->tbl->gc_list); |
650 | ||
a263b309 DM |
651 | if (want_ref) |
652 | neigh_hold(n); | |
767e97e1 ED |
653 | rcu_assign_pointer(n->next, |
654 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
655 | lockdep_is_held(&tbl->lock))); | |
656 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 657 | write_unlock_bh(&tbl->lock); |
d5d427cd | 658 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
659 | rc = n; |
660 | out: | |
661 | return rc; | |
662 | out_tbl_unlock: | |
663 | write_unlock_bh(&tbl->lock); | |
664 | out_neigh_release: | |
64c6f4bb DA |
665 | if (!exempt_from_gc) |
666 | atomic_dec(&tbl->gc_entries); | |
1da177e4 LT |
667 | neigh_release(n); |
668 | goto out; | |
669 | } | |
58956317 DA |
670 | |
671 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
672 | struct net_device *dev, bool want_ref) | |
673 | { | |
674 | return ___neigh_create(tbl, pkey, dev, false, want_ref); | |
675 | } | |
a263b309 | 676 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 677 | |
01ccdf12 | 678 | static u32 pneigh_hash(const void *pkey, unsigned int key_len) |
fa86d322 | 679 | { |
fa86d322 | 680 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
681 | hash_val ^= (hash_val >> 16); |
682 | hash_val ^= hash_val >> 8; | |
683 | hash_val ^= hash_val >> 4; | |
684 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
685 | return hash_val; |
686 | } | |
fa86d322 | 687 | |
be01d655 YH |
688 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
689 | struct net *net, | |
690 | const void *pkey, | |
01ccdf12 | 691 | unsigned int key_len, |
be01d655 YH |
692 | struct net_device *dev) |
693 | { | |
694 | while (n) { | |
fa86d322 | 695 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 696 | net_eq(pneigh_net(n), net) && |
fa86d322 | 697 | (n->dev == dev || !n->dev)) |
be01d655 YH |
698 | return n; |
699 | n = n->next; | |
fa86d322 | 700 | } |
be01d655 YH |
701 | return NULL; |
702 | } | |
fa86d322 | 703 | |
be01d655 YH |
704 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
705 | struct net *net, const void *pkey, struct net_device *dev) | |
706 | { | |
01ccdf12 | 707 | unsigned int key_len = tbl->key_len; |
be01d655 YH |
708 | u32 hash_val = pneigh_hash(pkey, key_len); |
709 | ||
710 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
711 | net, pkey, key_len, dev); | |
fa86d322 | 712 | } |
0a204500 | 713 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 714 | |
426b5303 EB |
715 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
716 | struct net *net, const void *pkey, | |
1da177e4 LT |
717 | struct net_device *dev, int creat) |
718 | { | |
719 | struct pneigh_entry *n; | |
01ccdf12 | 720 | unsigned int key_len = tbl->key_len; |
be01d655 | 721 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
722 | |
723 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
724 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
725 | net, pkey, key_len, dev); | |
1da177e4 | 726 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
727 | |
728 | if (n || !creat) | |
1da177e4 LT |
729 | goto out; |
730 | ||
4ae28944 PE |
731 | ASSERT_RTNL(); |
732 | ||
1da177e4 LT |
733 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
734 | if (!n) | |
735 | goto out; | |
736 | ||
754d5da6 | 737 | n->protocol = 0; |
efd7ef1c | 738 | write_pnet(&n->net, net); |
1da177e4 LT |
739 | memcpy(n->key, pkey, key_len); |
740 | n->dev = dev; | |
741 | if (dev) | |
742 | dev_hold(dev); | |
743 | ||
744 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
745 | if (dev) | |
746 | dev_put(dev); | |
747 | kfree(n); | |
748 | n = NULL; | |
749 | goto out; | |
750 | } | |
751 | ||
752 | write_lock_bh(&tbl->lock); | |
753 | n->next = tbl->phash_buckets[hash_val]; | |
754 | tbl->phash_buckets[hash_val] = n; | |
755 | write_unlock_bh(&tbl->lock); | |
756 | out: | |
757 | return n; | |
758 | } | |
0a204500 | 759 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
760 | |
761 | ||
426b5303 | 762 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
763 | struct net_device *dev) |
764 | { | |
765 | struct pneigh_entry *n, **np; | |
01ccdf12 | 766 | unsigned int key_len = tbl->key_len; |
be01d655 | 767 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
768 | |
769 | write_lock_bh(&tbl->lock); | |
770 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
771 | np = &n->next) { | |
426b5303 | 772 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 773 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
774 | *np = n->next; |
775 | write_unlock_bh(&tbl->lock); | |
776 | if (tbl->pdestructor) | |
777 | tbl->pdestructor(n); | |
778 | if (n->dev) | |
779 | dev_put(n->dev); | |
780 | kfree(n); | |
781 | return 0; | |
782 | } | |
783 | } | |
784 | write_unlock_bh(&tbl->lock); | |
785 | return -ENOENT; | |
786 | } | |
787 | ||
53b76cdf WB |
788 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
789 | struct net_device *dev) | |
1da177e4 | 790 | { |
53b76cdf | 791 | struct pneigh_entry *n, **np, *freelist = NULL; |
1da177e4 LT |
792 | u32 h; |
793 | ||
794 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
795 | np = &tbl->phash_buckets[h]; | |
796 | while ((n = *np) != NULL) { | |
797 | if (!dev || n->dev == dev) { | |
798 | *np = n->next; | |
53b76cdf WB |
799 | n->next = freelist; |
800 | freelist = n; | |
1da177e4 LT |
801 | continue; |
802 | } | |
803 | np = &n->next; | |
804 | } | |
805 | } | |
53b76cdf WB |
806 | write_unlock_bh(&tbl->lock); |
807 | while ((n = freelist)) { | |
808 | freelist = n->next; | |
809 | n->next = NULL; | |
810 | if (tbl->pdestructor) | |
811 | tbl->pdestructor(n); | |
812 | if (n->dev) | |
813 | dev_put(n->dev); | |
814 | kfree(n); | |
815 | } | |
1da177e4 LT |
816 | return -ENOENT; |
817 | } | |
818 | ||
06f0511d DL |
819 | static void neigh_parms_destroy(struct neigh_parms *parms); |
820 | ||
821 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
822 | { | |
6343944b | 823 | if (refcount_dec_and_test(&parms->refcnt)) |
06f0511d DL |
824 | neigh_parms_destroy(parms); |
825 | } | |
1da177e4 LT |
826 | |
827 | /* | |
828 | * neighbour must already be out of the table; | |
829 | * | |
830 | */ | |
831 | void neigh_destroy(struct neighbour *neigh) | |
832 | { | |
da6a8fa0 DM |
833 | struct net_device *dev = neigh->dev; |
834 | ||
1da177e4 LT |
835 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
836 | ||
837 | if (!neigh->dead) { | |
e005d193 | 838 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
839 | dump_stack(); |
840 | return; | |
841 | } | |
842 | ||
843 | if (neigh_del_timer(neigh)) | |
e005d193 | 844 | pr_warn("Impossible event\n"); |
1da177e4 | 845 | |
c9ab4d85 ED |
846 | write_lock_bh(&neigh->lock); |
847 | __skb_queue_purge(&neigh->arp_queue); | |
848 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 849 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 850 | |
447f2191 | 851 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 852 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 853 | |
da6a8fa0 | 854 | dev_put(dev); |
1da177e4 LT |
855 | neigh_parms_put(neigh->parms); |
856 | ||
d5d427cd | 857 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
858 | |
859 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 860 | kfree_rcu(neigh, rcu); |
1da177e4 | 861 | } |
0a204500 | 862 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
863 | |
864 | /* Neighbour state is suspicious; | |
865 | disable fast path. | |
866 | ||
867 | Called with write_locked neigh. | |
868 | */ | |
869 | static void neigh_suspect(struct neighbour *neigh) | |
870 | { | |
d5d427cd | 871 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
872 | |
873 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
874 | } |
875 | ||
876 | /* Neighbour state is OK; | |
877 | enable fast path. | |
878 | ||
879 | Called with write_locked neigh. | |
880 | */ | |
881 | static void neigh_connect(struct neighbour *neigh) | |
882 | { | |
d5d427cd | 883 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
884 | |
885 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
886 | } |
887 | ||
e4c4e448 | 888 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 889 | { |
e4c4e448 | 890 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
891 | struct neighbour *n; |
892 | struct neighbour __rcu **np; | |
e4c4e448 | 893 | unsigned int i; |
d6bf7817 | 894 | struct neigh_hash_table *nht; |
1da177e4 LT |
895 | |
896 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
897 | ||
e4c4e448 | 898 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
899 | nht = rcu_dereference_protected(tbl->nht, |
900 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
901 | |
902 | /* | |
903 | * periodically recompute ReachableTime from random function | |
904 | */ | |
905 | ||
e4c4e448 | 906 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 907 | struct neigh_parms *p; |
e4c4e448 | 908 | tbl->last_rand = jiffies; |
75fbfd33 | 909 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 910 | p->reachable_time = |
1f9248e5 | 911 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
912 | } |
913 | ||
feff9ab2 DJ |
914 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
915 | goto out; | |
916 | ||
cd089336 | 917 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 918 | np = &nht->hash_buckets[i]; |
1da177e4 | 919 | |
767e97e1 ED |
920 | while ((n = rcu_dereference_protected(*np, |
921 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 922 | unsigned int state; |
1da177e4 | 923 | |
e4c4e448 | 924 | write_lock(&n->lock); |
1da177e4 | 925 | |
e4c4e448 | 926 | state = n->nud_state; |
9ce33e46 RP |
927 | if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) || |
928 | (n->flags & NTF_EXT_LEARNED)) { | |
e4c4e448 ED |
929 | write_unlock(&n->lock); |
930 | goto next_elt; | |
931 | } | |
1da177e4 | 932 | |
e4c4e448 ED |
933 | if (time_before(n->used, n->confirmed)) |
934 | n->used = n->confirmed; | |
1da177e4 | 935 | |
9f237430 | 936 | if (refcount_read(&n->refcnt) == 1 && |
e4c4e448 | 937 | (state == NUD_FAILED || |
1f9248e5 | 938 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 | 939 | *np = n->next; |
58956317 | 940 | neigh_mark_dead(n); |
e4c4e448 ED |
941 | write_unlock(&n->lock); |
942 | neigh_cleanup_and_release(n); | |
943 | continue; | |
944 | } | |
1da177e4 | 945 | write_unlock(&n->lock); |
1da177e4 LT |
946 | |
947 | next_elt: | |
e4c4e448 ED |
948 | np = &n->next; |
949 | } | |
950 | /* | |
951 | * It's fine to release lock here, even if hash table | |
952 | * grows while we are preempted. | |
953 | */ | |
954 | write_unlock_bh(&tbl->lock); | |
955 | cond_resched(); | |
956 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
957 | nht = rcu_dereference_protected(tbl->nht, |
958 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 959 | } |
2724680b | 960 | out: |
1f9248e5 JP |
961 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
962 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
963 | * BASE_REACHABLE_TIME. | |
1da177e4 | 964 | */ |
f618002b | 965 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 966 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 967 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
968 | } |
969 | ||
970 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
971 | { | |
972 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
973 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
974 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
975 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
976 | } |
977 | ||
5ef12d98 | 978 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
979 | __releases(neigh->lock) |
980 | __acquires(neigh->lock) | |
5ef12d98 TT |
981 | { |
982 | struct sk_buff *skb; | |
983 | ||
984 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 985 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
986 | neigh->updated = jiffies; |
987 | ||
988 | /* It is very thin place. report_unreachable is very complicated | |
989 | routine. Particularly, it can hit the same neighbour entry! | |
990 | ||
991 | So that, we try to be accurate and avoid dead loop. --ANK | |
992 | */ | |
993 | while (neigh->nud_state == NUD_FAILED && | |
994 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
995 | write_unlock(&neigh->lock); | |
996 | neigh->ops->error_report(neigh, skb); | |
997 | write_lock(&neigh->lock); | |
998 | } | |
c9ab4d85 | 999 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1000 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
1001 | } |
1002 | ||
cd28ca0a ED |
1003 | static void neigh_probe(struct neighbour *neigh) |
1004 | __releases(neigh->lock) | |
1005 | { | |
4ed377e3 | 1006 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
1007 | /* keep skb alive even if arp_queue overflows */ |
1008 | if (skb) | |
19125c1a | 1009 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a | 1010 | write_unlock(&neigh->lock); |
48481c8f ED |
1011 | if (neigh->ops->solicit) |
1012 | neigh->ops->solicit(neigh, skb); | |
cd28ca0a | 1013 | atomic_inc(&neigh->probes); |
87fff3ca | 1014 | consume_skb(skb); |
cd28ca0a ED |
1015 | } |
1016 | ||
1da177e4 LT |
1017 | /* Called when a timer expires for a neighbour entry. */ |
1018 | ||
e99e88a9 | 1019 | static void neigh_timer_handler(struct timer_list *t) |
1da177e4 LT |
1020 | { |
1021 | unsigned long now, next; | |
e99e88a9 | 1022 | struct neighbour *neigh = from_timer(neigh, t, timer); |
95c96174 | 1023 | unsigned int state; |
1da177e4 LT |
1024 | int notify = 0; |
1025 | ||
1026 | write_lock(&neigh->lock); | |
1027 | ||
1028 | state = neigh->nud_state; | |
1029 | now = jiffies; | |
1030 | next = now + HZ; | |
1031 | ||
045f7b3b | 1032 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 1033 | goto out; |
1da177e4 LT |
1034 | |
1035 | if (state & NUD_REACHABLE) { | |
4ec93edb | 1036 | if (time_before_eq(now, |
1da177e4 | 1037 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 1038 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
1039 | next = neigh->confirmed + neigh->parms->reachable_time; |
1040 | } else if (time_before_eq(now, | |
1f9248e5 JP |
1041 | neigh->used + |
1042 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1043 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 1044 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1045 | neigh->updated = jiffies; |
1da177e4 | 1046 | neigh_suspect(neigh); |
1f9248e5 | 1047 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 1048 | } else { |
d5d427cd | 1049 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 1050 | neigh->nud_state = NUD_STALE; |
955aaa2f | 1051 | neigh->updated = jiffies; |
1da177e4 | 1052 | neigh_suspect(neigh); |
8d71740c | 1053 | notify = 1; |
1da177e4 LT |
1054 | } |
1055 | } else if (state & NUD_DELAY) { | |
4ec93edb | 1056 | if (time_before_eq(now, |
1f9248e5 JP |
1057 | neigh->confirmed + |
1058 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1059 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 1060 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 1061 | neigh->updated = jiffies; |
1da177e4 | 1062 | neigh_connect(neigh); |
8d71740c | 1063 | notify = 1; |
1da177e4 LT |
1064 | next = neigh->confirmed + neigh->parms->reachable_time; |
1065 | } else { | |
d5d427cd | 1066 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 1067 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 1068 | neigh->updated = jiffies; |
1da177e4 | 1069 | atomic_set(&neigh->probes, 0); |
765c9c63 | 1070 | notify = 1; |
1f9248e5 | 1071 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
1072 | } |
1073 | } else { | |
1074 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
1f9248e5 | 1075 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
1da177e4 LT |
1076 | } |
1077 | ||
1078 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
1079 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
1080 | neigh->nud_state = NUD_FAILED; |
1081 | notify = 1; | |
5ef12d98 | 1082 | neigh_invalidate(neigh); |
5e2c21dc | 1083 | goto out; |
1da177e4 LT |
1084 | } |
1085 | ||
1086 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
1087 | if (time_before(next, jiffies + HZ/2)) |
1088 | next = jiffies + HZ/2; | |
6fb9974f HX |
1089 | if (!mod_timer(&neigh->timer, next)) |
1090 | neigh_hold(neigh); | |
1da177e4 LT |
1091 | } |
1092 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 1093 | neigh_probe(neigh); |
9ff56607 | 1094 | } else { |
69cc64d8 | 1095 | out: |
9ff56607 DM |
1096 | write_unlock(&neigh->lock); |
1097 | } | |
d961db35 | 1098 | |
8d71740c | 1099 | if (notify) |
7b8f7a40 | 1100 | neigh_update_notify(neigh, 0); |
1da177e4 | 1101 | |
56dd18a4 RP |
1102 | trace_neigh_timer_handler(neigh, 0); |
1103 | ||
1da177e4 LT |
1104 | neigh_release(neigh); |
1105 | } | |
1106 | ||
1107 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
1108 | { | |
1109 | int rc; | |
cd28ca0a | 1110 | bool immediate_probe = false; |
1da177e4 LT |
1111 | |
1112 | write_lock_bh(&neigh->lock); | |
1113 | ||
1114 | rc = 0; | |
1115 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
1116 | goto out_unlock_bh; | |
2c51a97f JA |
1117 | if (neigh->dead) |
1118 | goto out_dead; | |
1da177e4 | 1119 | |
1da177e4 | 1120 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
1121 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
1122 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
1123 | unsigned long next, now = jiffies; |
1124 | ||
1f9248e5 JP |
1125 | atomic_set(&neigh->probes, |
1126 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
071c3798 | 1127 | neigh_del_timer(neigh); |
1da177e4 | 1128 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 1129 | neigh->updated = now; |
1f9248e5 JP |
1130 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1131 | HZ/2); | |
cd28ca0a ED |
1132 | neigh_add_timer(neigh, next); |
1133 | immediate_probe = true; | |
1da177e4 LT |
1134 | } else { |
1135 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 1136 | neigh->updated = jiffies; |
1da177e4 LT |
1137 | write_unlock_bh(&neigh->lock); |
1138 | ||
f3fbbe0f | 1139 | kfree_skb(skb); |
1da177e4 LT |
1140 | return 1; |
1141 | } | |
1142 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 1143 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
071c3798 | 1144 | neigh_del_timer(neigh); |
1da177e4 | 1145 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1146 | neigh->updated = jiffies; |
1f9248e5 JP |
1147 | neigh_add_timer(neigh, jiffies + |
1148 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
1149 | } |
1150 | ||
1151 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
1152 | if (skb) { | |
8b5c171b | 1153 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1154 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1155 | struct sk_buff *buff; |
8b5c171b | 1156 | |
f72051b0 | 1157 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1158 | if (!buff) |
1159 | break; | |
1160 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1161 | kfree_skb(buff); |
9a6d276e | 1162 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1163 | } |
a4731138 | 1164 | skb_dst_force(skb); |
1da177e4 | 1165 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1166 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1167 | } |
1168 | rc = 1; | |
1169 | } | |
1170 | out_unlock_bh: | |
cd28ca0a ED |
1171 | if (immediate_probe) |
1172 | neigh_probe(neigh); | |
1173 | else | |
1174 | write_unlock(&neigh->lock); | |
1175 | local_bh_enable(); | |
56dd18a4 | 1176 | trace_neigh_event_send_done(neigh, rc); |
1da177e4 | 1177 | return rc; |
2c51a97f JA |
1178 | |
1179 | out_dead: | |
1180 | if (neigh->nud_state & NUD_STALE) | |
1181 | goto out_unlock_bh; | |
1182 | write_unlock_bh(&neigh->lock); | |
1183 | kfree_skb(skb); | |
56dd18a4 | 1184 | trace_neigh_event_send_dead(neigh, 1); |
2c51a97f | 1185 | return 1; |
1da177e4 | 1186 | } |
0a204500 | 1187 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1188 | |
f6b72b62 | 1189 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1190 | { |
1191 | struct hh_cache *hh; | |
3b04ddde | 1192 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1193 | = NULL; |
1194 | ||
1195 | if (neigh->dev->header_ops) | |
1196 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1197 | |
1198 | if (update) { | |
f6b72b62 | 1199 | hh = &neigh->hh; |
c305c6ae | 1200 | if (READ_ONCE(hh->hh_len)) { |
3644f0ce | 1201 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1202 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1203 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1204 | } |
1205 | } | |
1206 | } | |
1207 | ||
1208 | ||
1209 | ||
1210 | /* Generic update routine. | |
1211 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1212 | -- new is new state. | |
1213 | -- flags | |
1214 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1215 | if it is different. | |
1216 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1217 | lladdr instead of overriding it |
1da177e4 | 1218 | if it is different. |
1da177e4 LT |
1219 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
1220 | ||
4ec93edb | 1221 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1222 | NTF_ROUTER flag. |
1223 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1224 | a router. | |
1225 | ||
1226 | Caller MUST hold reference count on the entry. | |
1227 | */ | |
1228 | ||
7a35a50d DA |
1229 | static int __neigh_update(struct neighbour *neigh, const u8 *lladdr, |
1230 | u8 new, u32 flags, u32 nlmsg_pid, | |
1231 | struct netlink_ext_ack *extack) | |
1da177e4 | 1232 | { |
e997f8a2 | 1233 | bool ext_learn_change = false; |
1da177e4 LT |
1234 | u8 old; |
1235 | int err; | |
1da177e4 | 1236 | int notify = 0; |
1da177e4 LT |
1237 | struct net_device *dev; |
1238 | int update_isrouter = 0; | |
1239 | ||
56dd18a4 RP |
1240 | trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid); |
1241 | ||
1da177e4 LT |
1242 | write_lock_bh(&neigh->lock); |
1243 | ||
1244 | dev = neigh->dev; | |
1245 | old = neigh->nud_state; | |
1246 | err = -EPERM; | |
1247 | ||
4ec93edb | 1248 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1249 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1250 | goto out; | |
7a35a50d DA |
1251 | if (neigh->dead) { |
1252 | NL_SET_ERR_MSG(extack, "Neighbor entry is now dead"); | |
2c51a97f | 1253 | goto out; |
7a35a50d | 1254 | } |
1da177e4 | 1255 | |
e997f8a2 | 1256 | ext_learn_change = neigh_update_ext_learned(neigh, flags, ¬ify); |
9ce33e46 | 1257 | |
1da177e4 LT |
1258 | if (!(new & NUD_VALID)) { |
1259 | neigh_del_timer(neigh); | |
1260 | if (old & NUD_CONNECTED) | |
1261 | neigh_suspect(neigh); | |
9c29a2f5 | 1262 | neigh->nud_state = new; |
1da177e4 | 1263 | err = 0; |
1da177e4 | 1264 | notify = old & NUD_VALID; |
d2fb4fb8 | 1265 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
5ef12d98 TT |
1266 | (new & NUD_FAILED)) { |
1267 | neigh_invalidate(neigh); | |
1268 | notify = 1; | |
1269 | } | |
1da177e4 LT |
1270 | goto out; |
1271 | } | |
1272 | ||
1273 | /* Compare new lladdr with cached one */ | |
1274 | if (!dev->addr_len) { | |
1275 | /* First case: device needs no address. */ | |
1276 | lladdr = neigh->ha; | |
1277 | } else if (lladdr) { | |
1278 | /* The second case: if something is already cached | |
1279 | and a new address is proposed: | |
1280 | - compare new & old | |
1281 | - if they are different, check override flag | |
1282 | */ | |
4ec93edb | 1283 | if ((old & NUD_VALID) && |
1da177e4 LT |
1284 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1285 | lladdr = neigh->ha; | |
1286 | } else { | |
1287 | /* No address is supplied; if we know something, | |
1288 | use it, otherwise discard the request. | |
1289 | */ | |
1290 | err = -EINVAL; | |
7a35a50d DA |
1291 | if (!(old & NUD_VALID)) { |
1292 | NL_SET_ERR_MSG(extack, "No link layer address given"); | |
1da177e4 | 1293 | goto out; |
7a35a50d | 1294 | } |
1da177e4 LT |
1295 | lladdr = neigh->ha; |
1296 | } | |
1297 | ||
f0e0d044 VK |
1298 | /* Update confirmed timestamp for neighbour entry after we |
1299 | * received ARP packet even if it doesn't change IP to MAC binding. | |
1300 | */ | |
1301 | if (new & NUD_CONNECTED) | |
1302 | neigh->confirmed = jiffies; | |
1303 | ||
1da177e4 LT |
1304 | /* If entry was valid and address is not changed, |
1305 | do not change entry state, if new one is STALE. | |
1306 | */ | |
1307 | err = 0; | |
1308 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1309 | if (old & NUD_VALID) { | |
1310 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1311 | update_isrouter = 0; | |
1312 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1313 | (old & NUD_CONNECTED)) { | |
1314 | lladdr = neigh->ha; | |
1315 | new = NUD_STALE; | |
1316 | } else | |
1317 | goto out; | |
1318 | } else { | |
0e7bbcc1 JA |
1319 | if (lladdr == neigh->ha && new == NUD_STALE && |
1320 | !(flags & NEIGH_UPDATE_F_ADMIN)) | |
1da177e4 LT |
1321 | new = old; |
1322 | } | |
1323 | } | |
1324 | ||
f0e0d044 | 1325 | /* Update timestamp only once we know we will make a change to the |
77d71233 IH |
1326 | * neighbour entry. Otherwise we risk to move the locktime window with |
1327 | * noop updates and ignore relevant ARP updates. | |
1328 | */ | |
f0e0d044 | 1329 | if (new != old || lladdr != neigh->ha) |
77d71233 | 1330 | neigh->updated = jiffies; |
77d71233 | 1331 | |
1da177e4 LT |
1332 | if (new != old) { |
1333 | neigh_del_timer(neigh); | |
765c9c63 EK |
1334 | if (new & NUD_PROBE) |
1335 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1336 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1337 | neigh_add_timer(neigh, (jiffies + |
1338 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1339 | neigh->parms->reachable_time : |
1340 | 0))); | |
9c29a2f5 | 1341 | neigh->nud_state = new; |
53385d2d | 1342 | notify = 1; |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1346 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1347 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1348 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1349 | neigh_update_hhs(neigh); |
1350 | if (!(new & NUD_CONNECTED)) | |
1351 | neigh->confirmed = jiffies - | |
1f9248e5 | 1352 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1353 | notify = 1; |
1da177e4 LT |
1354 | } |
1355 | if (new == old) | |
1356 | goto out; | |
1357 | if (new & NUD_CONNECTED) | |
1358 | neigh_connect(neigh); | |
1359 | else | |
1360 | neigh_suspect(neigh); | |
1361 | if (!(old & NUD_VALID)) { | |
1362 | struct sk_buff *skb; | |
1363 | ||
1364 | /* Again: avoid dead loop if something went wrong */ | |
1365 | ||
1366 | while (neigh->nud_state & NUD_VALID && | |
1367 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1368 | struct dst_entry *dst = skb_dst(skb); |
1369 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1370 | write_unlock_bh(&neigh->lock); |
e049f288 | 1371 | |
1372 | rcu_read_lock(); | |
13a43d94 DM |
1373 | |
1374 | /* Why not just use 'neigh' as-is? The problem is that | |
1375 | * things such as shaper, eql, and sch_teql can end up | |
1376 | * using alternative, different, neigh objects to output | |
1377 | * the packet in the output path. So what we need to do | |
1378 | * here is re-lookup the top-level neigh in the path so | |
1379 | * we can reinject the packet there. | |
1380 | */ | |
1381 | n2 = NULL; | |
1382 | if (dst) { | |
1383 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1384 | if (n2) | |
1385 | n1 = n2; | |
1386 | } | |
8f40b161 | 1387 | n1->output(n1, skb); |
13a43d94 DM |
1388 | if (n2) |
1389 | neigh_release(n2); | |
e049f288 | 1390 | rcu_read_unlock(); |
1391 | ||
1da177e4 LT |
1392 | write_lock_bh(&neigh->lock); |
1393 | } | |
c9ab4d85 | 1394 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1395 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1396 | } |
1397 | out: | |
fc6e8073 RP |
1398 | if (update_isrouter) |
1399 | neigh_update_is_router(neigh, flags, ¬ify); | |
1da177e4 | 1400 | write_unlock_bh(&neigh->lock); |
8d71740c | 1401 | |
e997f8a2 | 1402 | if (((new ^ old) & NUD_PERMANENT) || ext_learn_change) |
9c29a2f5 DA |
1403 | neigh_update_gc_list(neigh); |
1404 | ||
8d71740c | 1405 | if (notify) |
7b8f7a40 | 1406 | neigh_update_notify(neigh, nlmsg_pid); |
d961db35 | 1407 | |
56dd18a4 RP |
1408 | trace_neigh_update_done(neigh, err); |
1409 | ||
1da177e4 LT |
1410 | return err; |
1411 | } | |
7a35a50d DA |
1412 | |
1413 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1414 | u32 flags, u32 nlmsg_pid) | |
1415 | { | |
1416 | return __neigh_update(neigh, lladdr, new, flags, nlmsg_pid, NULL); | |
1417 | } | |
0a204500 | 1418 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1419 | |
7e980569 JB |
1420 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1421 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1422 | */ | |
1423 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1424 | { | |
2c51a97f JA |
1425 | if (neigh->dead) |
1426 | return; | |
7e980569 JB |
1427 | neigh->updated = jiffies; |
1428 | if (!(neigh->nud_state & NUD_FAILED)) | |
1429 | return; | |
2176d5d4 DJ |
1430 | neigh->nud_state = NUD_INCOMPLETE; |
1431 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 JB |
1432 | neigh_add_timer(neigh, |
1433 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); | |
1434 | } | |
1435 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1436 | ||
1da177e4 LT |
1437 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1438 | u8 *lladdr, void *saddr, | |
1439 | struct net_device *dev) | |
1440 | { | |
1441 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1442 | lladdr || !dev->addr_len); | |
1443 | if (neigh) | |
4ec93edb | 1444 | neigh_update(neigh, lladdr, NUD_STALE, |
7b8f7a40 | 1445 | NEIGH_UPDATE_F_OVERRIDE, 0); |
1da177e4 LT |
1446 | return neigh; |
1447 | } | |
0a204500 | 1448 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1449 | |
34d101dd | 1450 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1451 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1452 | { |
bdf53c58 EB |
1453 | struct net_device *dev = n->dev; |
1454 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1455 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1456 | |
1457 | write_lock_bh(&n->lock); | |
34d101dd | 1458 | |
f6b72b62 DM |
1459 | /* Only one thread can come in here and initialize the |
1460 | * hh_cache entry. | |
1461 | */ | |
b23b5455 DM |
1462 | if (!hh->hh_len) |
1463 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1464 | |
0ed8ddf4 | 1465 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1466 | } |
1467 | ||
1da177e4 LT |
1468 | /* Slow and careful. */ |
1469 | ||
8f40b161 | 1470 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1471 | { |
1da177e4 LT |
1472 | int rc = 0; |
1473 | ||
1da177e4 LT |
1474 | if (!neigh_event_send(neigh, skb)) { |
1475 | int err; | |
1476 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1477 | unsigned int seq; |
34d101dd | 1478 | |
c305c6ae | 1479 | if (dev->header_ops->cache && !READ_ONCE(neigh->hh.hh_len)) |
bdf53c58 | 1480 | neigh_hh_init(neigh); |
34d101dd | 1481 | |
0ed8ddf4 | 1482 | do { |
e1f16503 | 1483 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1484 | seq = read_seqbegin(&neigh->ha_lock); |
1485 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1486 | neigh->ha, NULL, skb->len); | |
1487 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1488 | |
1da177e4 | 1489 | if (err >= 0) |
542d4d68 | 1490 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1491 | else |
1492 | goto out_kfree_skb; | |
1493 | } | |
1494 | out: | |
1495 | return rc; | |
1da177e4 LT |
1496 | out_kfree_skb: |
1497 | rc = -EINVAL; | |
1498 | kfree_skb(skb); | |
1499 | goto out; | |
1500 | } | |
0a204500 | 1501 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1502 | |
1503 | /* As fast as possible without hh cache */ | |
1504 | ||
8f40b161 | 1505 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1506 | { |
1da177e4 | 1507 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1508 | unsigned int seq; |
8f40b161 | 1509 | int err; |
1da177e4 | 1510 | |
0ed8ddf4 | 1511 | do { |
e1f16503 | 1512 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1513 | seq = read_seqbegin(&neigh->ha_lock); |
1514 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1515 | neigh->ha, NULL, skb->len); | |
1516 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1517 | ||
1da177e4 | 1518 | if (err >= 0) |
542d4d68 | 1519 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1520 | else { |
1521 | err = -EINVAL; | |
1522 | kfree_skb(skb); | |
1523 | } | |
1524 | return err; | |
1525 | } | |
0a204500 | 1526 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1527 | |
8f40b161 DM |
1528 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1529 | { | |
1530 | return dev_queue_xmit(skb); | |
1531 | } | |
1532 | EXPORT_SYMBOL(neigh_direct_output); | |
1533 | ||
e99e88a9 | 1534 | static void neigh_proxy_process(struct timer_list *t) |
1da177e4 | 1535 | { |
e99e88a9 | 1536 | struct neigh_table *tbl = from_timer(tbl, t, proxy_timer); |
1da177e4 LT |
1537 | long sched_next = 0; |
1538 | unsigned long now = jiffies; | |
f72051b0 | 1539 | struct sk_buff *skb, *n; |
1da177e4 LT |
1540 | |
1541 | spin_lock(&tbl->proxy_queue.lock); | |
1542 | ||
f72051b0 DM |
1543 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1544 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1545 | |
1da177e4 | 1546 | if (tdif <= 0) { |
f72051b0 | 1547 | struct net_device *dev = skb->dev; |
20e6074e | 1548 | |
f72051b0 | 1549 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1550 | if (tbl->proxy_redo && netif_running(dev)) { |
1551 | rcu_read_lock(); | |
f72051b0 | 1552 | tbl->proxy_redo(skb); |
20e6074e ED |
1553 | rcu_read_unlock(); |
1554 | } else { | |
f72051b0 | 1555 | kfree_skb(skb); |
20e6074e | 1556 | } |
1da177e4 LT |
1557 | |
1558 | dev_put(dev); | |
1559 | } else if (!sched_next || tdif < sched_next) | |
1560 | sched_next = tdif; | |
1561 | } | |
1562 | del_timer(&tbl->proxy_timer); | |
1563 | if (sched_next) | |
1564 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1565 | spin_unlock(&tbl->proxy_queue.lock); | |
1566 | } | |
1567 | ||
1568 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1569 | struct sk_buff *skb) | |
1570 | { | |
1571 | unsigned long now = jiffies; | |
63862b5b AH |
1572 | |
1573 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1574 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1575 | |
1f9248e5 | 1576 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1577 | kfree_skb(skb); |
1578 | return; | |
1579 | } | |
a61bbcf2 PM |
1580 | |
1581 | NEIGH_CB(skb)->sched_next = sched_next; | |
1582 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1583 | |
1584 | spin_lock(&tbl->proxy_queue.lock); | |
1585 | if (del_timer(&tbl->proxy_timer)) { | |
1586 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1587 | sched_next = tbl->proxy_timer.expires; | |
1588 | } | |
adf30907 | 1589 | skb_dst_drop(skb); |
1da177e4 LT |
1590 | dev_hold(skb->dev); |
1591 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1592 | mod_timer(&tbl->proxy_timer, sched_next); | |
1593 | spin_unlock(&tbl->proxy_queue.lock); | |
1594 | } | |
0a204500 | 1595 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1596 | |
97fd5bc7 | 1597 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1598 | struct net *net, int ifindex) |
1599 | { | |
1600 | struct neigh_parms *p; | |
1601 | ||
75fbfd33 | 1602 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1603 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1604 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1605 | return p; |
1606 | } | |
1607 | ||
1608 | return NULL; | |
1609 | } | |
1da177e4 LT |
1610 | |
1611 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1612 | struct neigh_table *tbl) | |
1613 | { | |
cf89d6b2 | 1614 | struct neigh_parms *p; |
00829823 SH |
1615 | struct net *net = dev_net(dev); |
1616 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1617 | |
cf89d6b2 | 1618 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1619 | if (p) { |
1da177e4 | 1620 | p->tbl = tbl; |
6343944b | 1621 | refcount_set(&p->refcnt, 1); |
1da177e4 | 1622 | p->reachable_time = |
1f9248e5 | 1623 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1624 | dev_hold(dev); |
1625 | p->dev = dev; | |
efd7ef1c | 1626 | write_pnet(&p->net, net); |
63134803 | 1627 | p->sysctl_table = NULL; |
c7fb64db | 1628 | |
00829823 | 1629 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1630 | dev_put(dev); |
486b51d3 DL |
1631 | kfree(p); |
1632 | return NULL; | |
1da177e4 | 1633 | } |
486b51d3 | 1634 | |
1da177e4 | 1635 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1636 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1637 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1638 | |
1639 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1640 | } |
1641 | return p; | |
1642 | } | |
0a204500 | 1643 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1644 | |
1645 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1646 | { | |
1647 | struct neigh_parms *parms = | |
1648 | container_of(head, struct neigh_parms, rcu_head); | |
1649 | ||
1650 | neigh_parms_put(parms); | |
1651 | } | |
1652 | ||
1653 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1654 | { | |
1da177e4 LT |
1655 | if (!parms || parms == &tbl->parms) |
1656 | return; | |
1657 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1658 | list_del(&parms->list); |
1659 | parms->dead = 1; | |
1da177e4 | 1660 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1661 | if (parms->dev) |
1662 | dev_put(parms->dev); | |
1663 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1664 | } |
0a204500 | 1665 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1666 | |
06f0511d | 1667 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1668 | { |
1669 | kfree(parms); | |
1670 | } | |
1671 | ||
c2ecba71 PE |
1672 | static struct lock_class_key neigh_table_proxy_queue_class; |
1673 | ||
d7480fd3 WC |
1674 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1675 | ||
1676 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1677 | { |
1678 | unsigned long now = jiffies; | |
1679 | unsigned long phsize; | |
1680 | ||
75fbfd33 | 1681 | INIT_LIST_HEAD(&tbl->parms_list); |
58956317 | 1682 | INIT_LIST_HEAD(&tbl->gc_list); |
75fbfd33 | 1683 | list_add(&tbl->parms.list, &tbl->parms_list); |
e42ea986 | 1684 | write_pnet(&tbl->parms.net, &init_net); |
6343944b | 1685 | refcount_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1686 | tbl->parms.reachable_time = |
1f9248e5 | 1687 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1688 | |
1da177e4 LT |
1689 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1690 | if (!tbl->stats) | |
1691 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1692 | |
1da177e4 | 1693 | #ifdef CONFIG_PROC_FS |
71a5053a CH |
1694 | if (!proc_create_seq_data(tbl->id, 0, init_net.proc_net_stat, |
1695 | &neigh_stat_seq_ops, tbl)) | |
1da177e4 | 1696 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1697 | #endif |
1698 | ||
cd089336 | 1699 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1700 | |
1701 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1702 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1703 | |
d6bf7817 | 1704 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1705 | panic("cannot allocate neighbour cache hashes"); |
1706 | ||
08433eff YH |
1707 | if (!tbl->entry_size) |
1708 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1709 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1710 | else | |
1711 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1712 | ||
1da177e4 | 1713 | rwlock_init(&tbl->lock); |
203b42f7 | 1714 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b VK |
1715 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1716 | tbl->parms.reachable_time); | |
e99e88a9 | 1717 | timer_setup(&tbl->proxy_timer, neigh_proxy_process, 0); |
c2ecba71 PE |
1718 | skb_queue_head_init_class(&tbl->proxy_queue, |
1719 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1720 | |
1721 | tbl->last_flush = now; | |
1722 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1723 | |
d7480fd3 | 1724 | neigh_tables[index] = tbl; |
1da177e4 | 1725 | } |
0a204500 | 1726 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1727 | |
d7480fd3 | 1728 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1729 | { |
d7480fd3 | 1730 | neigh_tables[index] = NULL; |
1da177e4 | 1731 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1732 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1733 | del_timer_sync(&tbl->proxy_timer); |
1734 | pneigh_queue_purge(&tbl->proxy_queue); | |
1735 | neigh_ifdown(tbl, NULL); | |
1736 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1737 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1738 | |
6193d2be ED |
1739 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1740 | neigh_hash_free_rcu); | |
d6bf7817 | 1741 | tbl->nht = NULL; |
1da177e4 LT |
1742 | |
1743 | kfree(tbl->phash_buckets); | |
1744 | tbl->phash_buckets = NULL; | |
1745 | ||
3f192b5c AD |
1746 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1747 | ||
3fcde74b KK |
1748 | free_percpu(tbl->stats); |
1749 | tbl->stats = NULL; | |
1750 | ||
1da177e4 LT |
1751 | return 0; |
1752 | } | |
0a204500 | 1753 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1754 | |
d7480fd3 WC |
1755 | static struct neigh_table *neigh_find_table(int family) |
1756 | { | |
1757 | struct neigh_table *tbl = NULL; | |
1758 | ||
1759 | switch (family) { | |
1760 | case AF_INET: | |
1761 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1762 | break; | |
1763 | case AF_INET6: | |
1764 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1765 | break; | |
1766 | case AF_DECnet: | |
1767 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1768 | break; | |
1769 | } | |
1770 | ||
1771 | return tbl; | |
1772 | } | |
1773 | ||
82cbb5c6 RP |
1774 | const struct nla_policy nda_policy[NDA_MAX+1] = { |
1775 | [NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
1776 | [NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
1777 | [NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) }, | |
1778 | [NDA_PROBES] = { .type = NLA_U32 }, | |
1779 | [NDA_VLAN] = { .type = NLA_U16 }, | |
1780 | [NDA_PORT] = { .type = NLA_U16 }, | |
1781 | [NDA_VNI] = { .type = NLA_U32 }, | |
1782 | [NDA_IFINDEX] = { .type = NLA_U32 }, | |
1783 | [NDA_MASTER] = { .type = NLA_U32 }, | |
a9cd3439 | 1784 | [NDA_PROTOCOL] = { .type = NLA_U8 }, |
82cbb5c6 RP |
1785 | }; |
1786 | ||
c21ef3e3 DA |
1787 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, |
1788 | struct netlink_ext_ack *extack) | |
1da177e4 | 1789 | { |
3b1e0a65 | 1790 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1791 | struct ndmsg *ndm; |
1792 | struct nlattr *dst_attr; | |
1da177e4 | 1793 | struct neigh_table *tbl; |
d7480fd3 | 1794 | struct neighbour *neigh; |
1da177e4 | 1795 | struct net_device *dev = NULL; |
a14a49d2 | 1796 | int err = -EINVAL; |
1da177e4 | 1797 | |
110b2499 | 1798 | ASSERT_RTNL(); |
a14a49d2 | 1799 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1800 | goto out; |
1801 | ||
a14a49d2 | 1802 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
7a35a50d DA |
1803 | if (!dst_attr) { |
1804 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
a14a49d2 | 1805 | goto out; |
7a35a50d | 1806 | } |
a14a49d2 TG |
1807 | |
1808 | ndm = nlmsg_data(nlh); | |
1809 | if (ndm->ndm_ifindex) { | |
110b2499 | 1810 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1811 | if (dev == NULL) { |
1812 | err = -ENODEV; | |
1813 | goto out; | |
1814 | } | |
1815 | } | |
1816 | ||
d7480fd3 WC |
1817 | tbl = neigh_find_table(ndm->ndm_family); |
1818 | if (tbl == NULL) | |
1819 | return -EAFNOSUPPORT; | |
1da177e4 | 1820 | |
7a35a50d DA |
1821 | if (nla_len(dst_attr) < (int)tbl->key_len) { |
1822 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1823 | goto out; |
7a35a50d | 1824 | } |
1da177e4 | 1825 | |
d7480fd3 WC |
1826 | if (ndm->ndm_flags & NTF_PROXY) { |
1827 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1828 | goto out; | |
1829 | } | |
1da177e4 | 1830 | |
d7480fd3 WC |
1831 | if (dev == NULL) |
1832 | goto out; | |
a14a49d2 | 1833 | |
d7480fd3 WC |
1834 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1835 | if (neigh == NULL) { | |
1836 | err = -ENOENT; | |
110b2499 | 1837 | goto out; |
1da177e4 | 1838 | } |
d7480fd3 | 1839 | |
7a35a50d DA |
1840 | err = __neigh_update(neigh, NULL, NUD_FAILED, |
1841 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, | |
1842 | NETLINK_CB(skb).portid, extack); | |
5071034e | 1843 | write_lock_bh(&tbl->lock); |
d7480fd3 | 1844 | neigh_release(neigh); |
5071034e SV |
1845 | neigh_remove_one(neigh, tbl); |
1846 | write_unlock_bh(&tbl->lock); | |
a14a49d2 | 1847 | |
1da177e4 LT |
1848 | out: |
1849 | return err; | |
1850 | } | |
1851 | ||
c21ef3e3 DA |
1852 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
1853 | struct netlink_ext_ack *extack) | |
1da177e4 | 1854 | { |
f7aa74e4 RP |
1855 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE | |
1856 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
3b1e0a65 | 1857 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1858 | struct ndmsg *ndm; |
1859 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1860 | struct neigh_table *tbl; |
1861 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1862 | struct neighbour *neigh; |
1863 | void *dst, *lladdr; | |
df9b0e30 | 1864 | u8 protocol = 0; |
5208debd | 1865 | int err; |
1da177e4 | 1866 | |
110b2499 | 1867 | ASSERT_RTNL(); |
8cb08174 JB |
1868 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, |
1869 | nda_policy, extack); | |
5208debd | 1870 | if (err < 0) |
1da177e4 LT |
1871 | goto out; |
1872 | ||
5208debd | 1873 | err = -EINVAL; |
7a35a50d DA |
1874 | if (!tb[NDA_DST]) { |
1875 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
5208debd | 1876 | goto out; |
7a35a50d | 1877 | } |
5208debd TG |
1878 | |
1879 | ndm = nlmsg_data(nlh); | |
1880 | if (ndm->ndm_ifindex) { | |
110b2499 | 1881 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1882 | if (dev == NULL) { |
1883 | err = -ENODEV; | |
1884 | goto out; | |
1885 | } | |
1886 | ||
7a35a50d DA |
1887 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) { |
1888 | NL_SET_ERR_MSG(extack, "Invalid link address"); | |
110b2499 | 1889 | goto out; |
7a35a50d | 1890 | } |
5208debd TG |
1891 | } |
1892 | ||
d7480fd3 WC |
1893 | tbl = neigh_find_table(ndm->ndm_family); |
1894 | if (tbl == NULL) | |
1895 | return -EAFNOSUPPORT; | |
1da177e4 | 1896 | |
7a35a50d DA |
1897 | if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) { |
1898 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1899 | goto out; |
7a35a50d DA |
1900 | } |
1901 | ||
d7480fd3 WC |
1902 | dst = nla_data(tb[NDA_DST]); |
1903 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1904 | |
a9cd3439 | 1905 | if (tb[NDA_PROTOCOL]) |
df9b0e30 | 1906 | protocol = nla_get_u8(tb[NDA_PROTOCOL]); |
df9b0e30 | 1907 | |
d7480fd3 WC |
1908 | if (ndm->ndm_flags & NTF_PROXY) { |
1909 | struct pneigh_entry *pn; | |
1910 | ||
1911 | err = -ENOBUFS; | |
1912 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1913 | if (pn) { | |
1914 | pn->flags = ndm->ndm_flags; | |
df9b0e30 DA |
1915 | if (protocol) |
1916 | pn->protocol = protocol; | |
d7480fd3 WC |
1917 | err = 0; |
1918 | } | |
1919 | goto out; | |
1920 | } | |
1da177e4 | 1921 | |
7a35a50d DA |
1922 | if (!dev) { |
1923 | NL_SET_ERR_MSG(extack, "Device not specified"); | |
d7480fd3 | 1924 | goto out; |
7a35a50d | 1925 | } |
62dd9318 | 1926 | |
b8fb1ab4 DA |
1927 | if (tbl->allow_add && !tbl->allow_add(dev, extack)) { |
1928 | err = -EINVAL; | |
1929 | goto out; | |
1930 | } | |
1931 | ||
d7480fd3 WC |
1932 | neigh = neigh_lookup(tbl, dst, dev); |
1933 | if (neigh == NULL) { | |
e997f8a2 DA |
1934 | bool exempt_from_gc; |
1935 | ||
d7480fd3 WC |
1936 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
1937 | err = -ENOENT; | |
110b2499 | 1938 | goto out; |
1da177e4 LT |
1939 | } |
1940 | ||
e997f8a2 DA |
1941 | exempt_from_gc = ndm->ndm_state & NUD_PERMANENT || |
1942 | ndm->ndm_flags & NTF_EXT_LEARNED; | |
1943 | neigh = ___neigh_create(tbl, dst, dev, exempt_from_gc, true); | |
d7480fd3 WC |
1944 | if (IS_ERR(neigh)) { |
1945 | err = PTR_ERR(neigh); | |
1946 | goto out; | |
1947 | } | |
1948 | } else { | |
1949 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1950 | err = -EEXIST; | |
1951 | neigh_release(neigh); | |
110b2499 | 1952 | goto out; |
5208debd | 1953 | } |
1da177e4 | 1954 | |
d7480fd3 | 1955 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
f7aa74e4 RP |
1956 | flags &= ~(NEIGH_UPDATE_F_OVERRIDE | |
1957 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1da177e4 LT |
1958 | } |
1959 | ||
9ce33e46 RP |
1960 | if (ndm->ndm_flags & NTF_EXT_LEARNED) |
1961 | flags |= NEIGH_UPDATE_F_EXT_LEARNED; | |
1962 | ||
f7aa74e4 RP |
1963 | if (ndm->ndm_flags & NTF_ROUTER) |
1964 | flags |= NEIGH_UPDATE_F_ISROUTER; | |
1965 | ||
d7480fd3 WC |
1966 | if (ndm->ndm_flags & NTF_USE) { |
1967 | neigh_event_send(neigh, NULL); | |
1968 | err = 0; | |
1969 | } else | |
7a35a50d DA |
1970 | err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags, |
1971 | NETLINK_CB(skb).portid, extack); | |
df9b0e30 DA |
1972 | |
1973 | if (protocol) | |
1974 | neigh->protocol = protocol; | |
1975 | ||
d7480fd3 WC |
1976 | neigh_release(neigh); |
1977 | ||
1da177e4 LT |
1978 | out: |
1979 | return err; | |
1980 | } | |
1981 | ||
c7fb64db TG |
1982 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1983 | { | |
ca860fb3 TG |
1984 | struct nlattr *nest; |
1985 | ||
ae0be8de | 1986 | nest = nla_nest_start_noflag(skb, NDTA_PARMS); |
ca860fb3 TG |
1987 | if (nest == NULL) |
1988 | return -ENOBUFS; | |
c7fb64db | 1989 | |
9a6308d7 DM |
1990 | if ((parms->dev && |
1991 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
6343944b | 1992 | nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) || |
1f9248e5 JP |
1993 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1994 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1995 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1996 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1997 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1998 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1999 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
2000 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
2001 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
2002 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
2003 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
2004 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
2005 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
2006 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
2007 | NDTPA_PAD) || | |
9a6308d7 | 2008 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 2009 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 2010 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 2011 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 2012 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 2013 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 2014 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 2015 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 2016 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 2017 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 2018 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 2019 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 2020 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
2175d87c | 2021 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD)) |
9a6308d7 | 2022 | goto nla_put_failure; |
ca860fb3 | 2023 | return nla_nest_end(skb, nest); |
c7fb64db | 2024 | |
ca860fb3 | 2025 | nla_put_failure: |
bc3ed28c TG |
2026 | nla_nest_cancel(skb, nest); |
2027 | return -EMSGSIZE; | |
c7fb64db TG |
2028 | } |
2029 | ||
ca860fb3 TG |
2030 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
2031 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
2032 | { |
2033 | struct nlmsghdr *nlh; | |
2034 | struct ndtmsg *ndtmsg; | |
2035 | ||
ca860fb3 TG |
2036 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2037 | if (nlh == NULL) | |
26932566 | 2038 | return -EMSGSIZE; |
c7fb64db | 2039 | |
ca860fb3 | 2040 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2041 | |
2042 | read_lock_bh(&tbl->lock); | |
2043 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2044 | ndtmsg->ndtm_pad1 = 0; |
2045 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2046 | |
9a6308d7 | 2047 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 2048 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
2049 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
2050 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
2051 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
2052 | goto nla_put_failure; | |
c7fb64db TG |
2053 | { |
2054 | unsigned long now = jiffies; | |
9d027e3a ED |
2055 | long flush_delta = now - tbl->last_flush; |
2056 | long rand_delta = now - tbl->last_rand; | |
d6bf7817 | 2057 | struct neigh_hash_table *nht; |
c7fb64db TG |
2058 | struct ndt_config ndc = { |
2059 | .ndtc_key_len = tbl->key_len, | |
2060 | .ndtc_entry_size = tbl->entry_size, | |
2061 | .ndtc_entries = atomic_read(&tbl->entries), | |
2062 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
2063 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
2064 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
2065 | }; | |
2066 | ||
d6bf7817 ED |
2067 | rcu_read_lock_bh(); |
2068 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 2069 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 2070 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
2071 | rcu_read_unlock_bh(); |
2072 | ||
9a6308d7 DM |
2073 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
2074 | goto nla_put_failure; | |
c7fb64db TG |
2075 | } |
2076 | ||
2077 | { | |
2078 | int cpu; | |
2079 | struct ndt_stats ndst; | |
2080 | ||
2081 | memset(&ndst, 0, sizeof(ndst)); | |
2082 | ||
6f912042 | 2083 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
2084 | struct neigh_statistics *st; |
2085 | ||
c7fb64db TG |
2086 | st = per_cpu_ptr(tbl->stats, cpu); |
2087 | ndst.ndts_allocs += st->allocs; | |
2088 | ndst.ndts_destroys += st->destroys; | |
2089 | ndst.ndts_hash_grows += st->hash_grows; | |
2090 | ndst.ndts_res_failed += st->res_failed; | |
2091 | ndst.ndts_lookups += st->lookups; | |
2092 | ndst.ndts_hits += st->hits; | |
2093 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
2094 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
2095 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
2096 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 2097 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
2098 | } |
2099 | ||
b676338f ND |
2100 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
2101 | NDTA_PAD)) | |
9a6308d7 | 2102 | goto nla_put_failure; |
c7fb64db TG |
2103 | } |
2104 | ||
2105 | BUG_ON(tbl->parms.dev); | |
2106 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 2107 | goto nla_put_failure; |
c7fb64db TG |
2108 | |
2109 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2110 | nlmsg_end(skb, nlh); |
2111 | return 0; | |
c7fb64db | 2112 | |
ca860fb3 | 2113 | nla_put_failure: |
c7fb64db | 2114 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2115 | nlmsg_cancel(skb, nlh); |
2116 | return -EMSGSIZE; | |
c7fb64db TG |
2117 | } |
2118 | ||
ca860fb3 TG |
2119 | static int neightbl_fill_param_info(struct sk_buff *skb, |
2120 | struct neigh_table *tbl, | |
c7fb64db | 2121 | struct neigh_parms *parms, |
ca860fb3 TG |
2122 | u32 pid, u32 seq, int type, |
2123 | unsigned int flags) | |
c7fb64db TG |
2124 | { |
2125 | struct ndtmsg *ndtmsg; | |
2126 | struct nlmsghdr *nlh; | |
2127 | ||
ca860fb3 TG |
2128 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2129 | if (nlh == NULL) | |
26932566 | 2130 | return -EMSGSIZE; |
c7fb64db | 2131 | |
ca860fb3 | 2132 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2133 | |
2134 | read_lock_bh(&tbl->lock); | |
2135 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2136 | ndtmsg->ndtm_pad1 = 0; |
2137 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2138 | |
ca860fb3 TG |
2139 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
2140 | neightbl_fill_parms(skb, parms) < 0) | |
2141 | goto errout; | |
c7fb64db TG |
2142 | |
2143 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2144 | nlmsg_end(skb, nlh); |
2145 | return 0; | |
ca860fb3 | 2146 | errout: |
c7fb64db | 2147 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2148 | nlmsg_cancel(skb, nlh); |
2149 | return -EMSGSIZE; | |
c7fb64db | 2150 | } |
4ec93edb | 2151 | |
ef7c79ed | 2152 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
2153 | [NDTA_NAME] = { .type = NLA_STRING }, |
2154 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
2155 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
2156 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
2157 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
2158 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
2159 | }; | |
2160 | ||
ef7c79ed | 2161 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
2162 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
2163 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
2164 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
2165 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
2166 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
2167 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 2168 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
2169 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
2170 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
2171 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
2172 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
2173 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
2174 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
2175 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
2176 | }; | |
2177 | ||
c21ef3e3 DA |
2178 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, |
2179 | struct netlink_ext_ack *extack) | |
c7fb64db | 2180 | { |
3b1e0a65 | 2181 | struct net *net = sock_net(skb->sk); |
c7fb64db | 2182 | struct neigh_table *tbl; |
6b3f8674 TG |
2183 | struct ndtmsg *ndtmsg; |
2184 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
2185 | bool found = false; |
2186 | int err, tidx; | |
c7fb64db | 2187 | |
8cb08174 JB |
2188 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
2189 | nl_neightbl_policy, extack); | |
6b3f8674 TG |
2190 | if (err < 0) |
2191 | goto errout; | |
c7fb64db | 2192 | |
6b3f8674 TG |
2193 | if (tb[NDTA_NAME] == NULL) { |
2194 | err = -EINVAL; | |
2195 | goto errout; | |
2196 | } | |
2197 | ||
2198 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
2199 | |
2200 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
2201 | tbl = neigh_tables[tidx]; | |
2202 | if (!tbl) | |
2203 | continue; | |
c7fb64db TG |
2204 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
2205 | continue; | |
d7480fd3 WC |
2206 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
2207 | found = true; | |
c7fb64db | 2208 | break; |
d7480fd3 | 2209 | } |
c7fb64db TG |
2210 | } |
2211 | ||
d7480fd3 WC |
2212 | if (!found) |
2213 | return -ENOENT; | |
c7fb64db | 2214 | |
4ec93edb | 2215 | /* |
c7fb64db TG |
2216 | * We acquire tbl->lock to be nice to the periodic timers and |
2217 | * make sure they always see a consistent set of values. | |
2218 | */ | |
2219 | write_lock_bh(&tbl->lock); | |
2220 | ||
6b3f8674 TG |
2221 | if (tb[NDTA_PARMS]) { |
2222 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 2223 | struct neigh_parms *p; |
6b3f8674 | 2224 | int i, ifindex = 0; |
c7fb64db | 2225 | |
8cb08174 JB |
2226 | err = nla_parse_nested_deprecated(tbp, NDTPA_MAX, |
2227 | tb[NDTA_PARMS], | |
2228 | nl_ntbl_parm_policy, extack); | |
6b3f8674 TG |
2229 | if (err < 0) |
2230 | goto errout_tbl_lock; | |
c7fb64db | 2231 | |
6b3f8674 TG |
2232 | if (tbp[NDTPA_IFINDEX]) |
2233 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 2234 | |
97fd5bc7 | 2235 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
2236 | if (p == NULL) { |
2237 | err = -ENOENT; | |
6b3f8674 | 2238 | goto errout_tbl_lock; |
c7fb64db | 2239 | } |
c7fb64db | 2240 | |
6b3f8674 TG |
2241 | for (i = 1; i <= NDTPA_MAX; i++) { |
2242 | if (tbp[i] == NULL) | |
2243 | continue; | |
c7fb64db | 2244 | |
6b3f8674 TG |
2245 | switch (i) { |
2246 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2247 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2248 | nla_get_u32(tbp[i]) * | |
2249 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2250 | break; |
2251 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2252 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2253 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2254 | break; |
2255 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2256 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2257 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2258 | break; |
2259 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2260 | NEIGH_VAR_SET(p, APP_PROBES, |
2261 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2262 | break; |
2263 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2264 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2265 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2266 | break; |
2267 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2268 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2269 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2270 | break; |
8da86466 YH |
2271 | case NDTPA_MCAST_REPROBES: |
2272 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2273 | nla_get_u32(tbp[i])); | |
2274 | break; | |
6b3f8674 | 2275 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2276 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2277 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2278 | /* update reachable_time as well, otherwise, the change will |
2279 | * only be effective after the next time neigh_periodic_work | |
2280 | * decides to recompute it (can be multiple minutes) | |
2281 | */ | |
2282 | p->reachable_time = | |
2283 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2284 | break; |
2285 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2286 | NEIGH_VAR_SET(p, GC_STALETIME, |
2287 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2288 | break; |
2289 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2290 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2291 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2292 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 TG |
2293 | break; |
2294 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2295 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2296 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2297 | break; |
2298 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2299 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2300 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2301 | break; |
2302 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2303 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2304 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2305 | break; |
2306 | case NDTPA_LOCKTIME: | |
3977458c JP |
2307 | NEIGH_VAR_SET(p, LOCKTIME, |
2308 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2309 | break; |
2310 | } | |
2311 | } | |
2312 | } | |
c7fb64db | 2313 | |
dc25c676 G |
2314 | err = -ENOENT; |
2315 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2316 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2317 | !net_eq(net, &init_net)) | |
2318 | goto errout_tbl_lock; | |
2319 | ||
6b3f8674 TG |
2320 | if (tb[NDTA_THRESH1]) |
2321 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2322 | |
6b3f8674 TG |
2323 | if (tb[NDTA_THRESH2]) |
2324 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2325 | |
6b3f8674 TG |
2326 | if (tb[NDTA_THRESH3]) |
2327 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2328 | |
6b3f8674 TG |
2329 | if (tb[NDTA_GC_INTERVAL]) |
2330 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2331 | |
2332 | err = 0; | |
2333 | ||
6b3f8674 | 2334 | errout_tbl_lock: |
c7fb64db | 2335 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2336 | errout: |
c7fb64db TG |
2337 | return err; |
2338 | } | |
2339 | ||
9632d47f DA |
2340 | static int neightbl_valid_dump_info(const struct nlmsghdr *nlh, |
2341 | struct netlink_ext_ack *extack) | |
2342 | { | |
2343 | struct ndtmsg *ndtm; | |
2344 | ||
2345 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) { | |
2346 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request"); | |
2347 | return -EINVAL; | |
2348 | } | |
2349 | ||
2350 | ndtm = nlmsg_data(nlh); | |
2351 | if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) { | |
2352 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request"); | |
2353 | return -EINVAL; | |
2354 | } | |
2355 | ||
2356 | if (nlmsg_attrlen(nlh, sizeof(*ndtm))) { | |
2357 | NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request"); | |
2358 | return -EINVAL; | |
2359 | } | |
2360 | ||
2361 | return 0; | |
2362 | } | |
2363 | ||
c8822a4e | 2364 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2365 | { |
9632d47f | 2366 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 2367 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2368 | int family, tidx, nidx = 0; |
2369 | int tbl_skip = cb->args[0]; | |
2370 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2371 | struct neigh_table *tbl; |
2372 | ||
9632d47f DA |
2373 | if (cb->strict_check) { |
2374 | int err = neightbl_valid_dump_info(nlh, cb->extack); | |
2375 | ||
2376 | if (err < 0) | |
2377 | return err; | |
2378 | } | |
2379 | ||
2380 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; | |
c7fb64db | 2381 | |
d7480fd3 | 2382 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2383 | struct neigh_parms *p; |
2384 | ||
d7480fd3 WC |
2385 | tbl = neigh_tables[tidx]; |
2386 | if (!tbl) | |
2387 | continue; | |
2388 | ||
ca860fb3 | 2389 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2390 | continue; |
2391 | ||
15e47304 | 2392 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
9632d47f | 2393 | nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2394 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2395 | break; |
2396 | ||
75fbfd33 ND |
2397 | nidx = 0; |
2398 | p = list_next_entry(&tbl->parms, list); | |
2399 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2400 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2401 | continue; |
2402 | ||
efc683fc GK |
2403 | if (nidx < neigh_skip) |
2404 | goto next; | |
c7fb64db | 2405 | |
ca860fb3 | 2406 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2407 | NETLINK_CB(cb->skb).portid, |
9632d47f | 2408 | nlh->nlmsg_seq, |
ca860fb3 | 2409 | RTM_NEWNEIGHTBL, |
7b46a644 | 2410 | NLM_F_MULTI) < 0) |
c7fb64db | 2411 | goto out; |
efc683fc GK |
2412 | next: |
2413 | nidx++; | |
c7fb64db TG |
2414 | } |
2415 | ||
ca860fb3 | 2416 | neigh_skip = 0; |
c7fb64db TG |
2417 | } |
2418 | out: | |
ca860fb3 TG |
2419 | cb->args[0] = tidx; |
2420 | cb->args[1] = nidx; | |
c7fb64db TG |
2421 | |
2422 | return skb->len; | |
2423 | } | |
1da177e4 | 2424 | |
8b8aec50 TG |
2425 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2426 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2427 | { |
2428 | unsigned long now = jiffies; | |
1da177e4 | 2429 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2430 | struct nlmsghdr *nlh; |
2431 | struct ndmsg *ndm; | |
2432 | ||
2433 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2434 | if (nlh == NULL) | |
26932566 | 2435 | return -EMSGSIZE; |
1da177e4 | 2436 | |
8b8aec50 TG |
2437 | ndm = nlmsg_data(nlh); |
2438 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2439 | ndm->ndm_pad1 = 0; |
2440 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2441 | ndm->ndm_flags = neigh->flags; |
2442 | ndm->ndm_type = neigh->type; | |
2443 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2444 | |
9a6308d7 DM |
2445 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2446 | goto nla_put_failure; | |
8b8aec50 TG |
2447 | |
2448 | read_lock_bh(&neigh->lock); | |
2449 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2450 | if (neigh->nud_state & NUD_VALID) { |
2451 | char haddr[MAX_ADDR_LEN]; | |
2452 | ||
2453 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2454 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2455 | read_unlock_bh(&neigh->lock); | |
2456 | goto nla_put_failure; | |
2457 | } | |
8b8aec50 TG |
2458 | } |
2459 | ||
b9f5f52c SH |
2460 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2461 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2462 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
9f237430 | 2463 | ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1; |
8b8aec50 TG |
2464 | read_unlock_bh(&neigh->lock); |
2465 | ||
9a6308d7 DM |
2466 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2467 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2468 | goto nla_put_failure; | |
8b8aec50 | 2469 | |
df9b0e30 DA |
2470 | if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol)) |
2471 | goto nla_put_failure; | |
2472 | ||
053c095a JB |
2473 | nlmsg_end(skb, nlh); |
2474 | return 0; | |
8b8aec50 TG |
2475 | |
2476 | nla_put_failure: | |
26932566 PM |
2477 | nlmsg_cancel(skb, nlh); |
2478 | return -EMSGSIZE; | |
1da177e4 LT |
2479 | } |
2480 | ||
84920c14 TZ |
2481 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2482 | u32 pid, u32 seq, int type, unsigned int flags, | |
2483 | struct neigh_table *tbl) | |
2484 | { | |
2485 | struct nlmsghdr *nlh; | |
2486 | struct ndmsg *ndm; | |
2487 | ||
2488 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2489 | if (nlh == NULL) | |
2490 | return -EMSGSIZE; | |
2491 | ||
2492 | ndm = nlmsg_data(nlh); | |
2493 | ndm->ndm_family = tbl->family; | |
2494 | ndm->ndm_pad1 = 0; | |
2495 | ndm->ndm_pad2 = 0; | |
2496 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2497 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2498 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2499 | ndm->ndm_state = NUD_NONE; |
2500 | ||
9a6308d7 DM |
2501 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2502 | goto nla_put_failure; | |
84920c14 | 2503 | |
df9b0e30 DA |
2504 | if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol)) |
2505 | goto nla_put_failure; | |
2506 | ||
053c095a JB |
2507 | nlmsg_end(skb, nlh); |
2508 | return 0; | |
84920c14 TZ |
2509 | |
2510 | nla_put_failure: | |
2511 | nlmsg_cancel(skb, nlh); | |
2512 | return -EMSGSIZE; | |
2513 | } | |
2514 | ||
7b8f7a40 | 2515 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid) |
d961db35 TG |
2516 | { |
2517 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
7b8f7a40 | 2518 | __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid); |
d961db35 | 2519 | } |
1da177e4 | 2520 | |
21fdd092 DA |
2521 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2522 | { | |
2523 | struct net_device *master; | |
2524 | ||
2525 | if (!master_idx) | |
2526 | return false; | |
2527 | ||
aab456df | 2528 | master = dev ? netdev_master_upper_dev_get(dev) : NULL; |
21fdd092 DA |
2529 | if (!master || master->ifindex != master_idx) |
2530 | return true; | |
2531 | ||
2532 | return false; | |
2533 | } | |
2534 | ||
16660f0b DA |
2535 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2536 | { | |
aab456df | 2537 | if (filter_idx && (!dev || dev->ifindex != filter_idx)) |
16660f0b DA |
2538 | return true; |
2539 | ||
2540 | return false; | |
2541 | } | |
2542 | ||
6f52f80e DA |
2543 | struct neigh_dump_filter { |
2544 | int master_idx; | |
2545 | int dev_idx; | |
2546 | }; | |
2547 | ||
1da177e4 | 2548 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2549 | struct netlink_callback *cb, |
2550 | struct neigh_dump_filter *filter) | |
1da177e4 | 2551 | { |
767e97e1 | 2552 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2553 | struct neighbour *n; |
2554 | int rc, h, s_h = cb->args[1]; | |
2555 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2556 | struct neigh_hash_table *nht; |
21fdd092 | 2557 | unsigned int flags = NLM_F_MULTI; |
21fdd092 | 2558 | |
6f52f80e DA |
2559 | if (filter->dev_idx || filter->master_idx) |
2560 | flags |= NLM_F_DUMP_FILTERED; | |
1da177e4 | 2561 | |
d6bf7817 ED |
2562 | rcu_read_lock_bh(); |
2563 | nht = rcu_dereference_bh(tbl->nht); | |
2564 | ||
4bd6683b | 2565 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2566 | if (h > s_h) |
2567 | s_idx = 0; | |
767e97e1 ED |
2568 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2569 | n != NULL; | |
2570 | n = rcu_dereference_bh(n->next)) { | |
18502acd ZS |
2571 | if (idx < s_idx || !net_eq(dev_net(n->dev), net)) |
2572 | goto next; | |
6f52f80e DA |
2573 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2574 | neigh_master_filtered(n->dev, filter->master_idx)) | |
efc683fc | 2575 | goto next; |
15e47304 | 2576 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2577 | cb->nlh->nlmsg_seq, |
b6544c0b | 2578 | RTM_NEWNEIGH, |
21fdd092 | 2579 | flags) < 0) { |
1da177e4 LT |
2580 | rc = -1; |
2581 | goto out; | |
2582 | } | |
767e97e1 | 2583 | next: |
efc683fc | 2584 | idx++; |
1da177e4 | 2585 | } |
1da177e4 LT |
2586 | } |
2587 | rc = skb->len; | |
2588 | out: | |
d6bf7817 | 2589 | rcu_read_unlock_bh(); |
1da177e4 LT |
2590 | cb->args[1] = h; |
2591 | cb->args[2] = idx; | |
2592 | return rc; | |
2593 | } | |
2594 | ||
84920c14 | 2595 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2596 | struct netlink_callback *cb, |
2597 | struct neigh_dump_filter *filter) | |
84920c14 TZ |
2598 | { |
2599 | struct pneigh_entry *n; | |
2600 | struct net *net = sock_net(skb->sk); | |
2601 | int rc, h, s_h = cb->args[3]; | |
2602 | int idx, s_idx = idx = cb->args[4]; | |
6f52f80e DA |
2603 | unsigned int flags = NLM_F_MULTI; |
2604 | ||
2605 | if (filter->dev_idx || filter->master_idx) | |
2606 | flags |= NLM_F_DUMP_FILTERED; | |
84920c14 TZ |
2607 | |
2608 | read_lock_bh(&tbl->lock); | |
2609 | ||
4bd6683b | 2610 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2611 | if (h > s_h) |
2612 | s_idx = 0; | |
2613 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
18502acd | 2614 | if (idx < s_idx || pneigh_net(n) != net) |
84920c14 | 2615 | goto next; |
6f52f80e DA |
2616 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2617 | neigh_master_filtered(n->dev, filter->master_idx)) | |
2618 | goto next; | |
15e47304 | 2619 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 | 2620 | cb->nlh->nlmsg_seq, |
6f52f80e | 2621 | RTM_NEWNEIGH, flags, tbl) < 0) { |
84920c14 TZ |
2622 | read_unlock_bh(&tbl->lock); |
2623 | rc = -1; | |
2624 | goto out; | |
2625 | } | |
2626 | next: | |
2627 | idx++; | |
2628 | } | |
2629 | } | |
2630 | ||
2631 | read_unlock_bh(&tbl->lock); | |
2632 | rc = skb->len; | |
2633 | out: | |
2634 | cb->args[3] = h; | |
2635 | cb->args[4] = idx; | |
2636 | return rc; | |
2637 | ||
2638 | } | |
2639 | ||
51183d23 DA |
2640 | static int neigh_valid_dump_req(const struct nlmsghdr *nlh, |
2641 | bool strict_check, | |
2642 | struct neigh_dump_filter *filter, | |
2643 | struct netlink_ext_ack *extack) | |
2644 | { | |
2645 | struct nlattr *tb[NDA_MAX + 1]; | |
2646 | int err, i; | |
2647 | ||
2648 | if (strict_check) { | |
2649 | struct ndmsg *ndm; | |
2650 | ||
2651 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2652 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor dump request"); | |
2653 | return -EINVAL; | |
2654 | } | |
2655 | ||
2656 | ndm = nlmsg_data(nlh); | |
2657 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_ifindex || | |
c0fde870 | 2658 | ndm->ndm_state || ndm->ndm_type) { |
51183d23 DA |
2659 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor dump request"); |
2660 | return -EINVAL; | |
2661 | } | |
2662 | ||
c0fde870 DA |
2663 | if (ndm->ndm_flags & ~NTF_PROXY) { |
2664 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor dump request"); | |
2665 | return -EINVAL; | |
2666 | } | |
2667 | ||
8cb08174 JB |
2668 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), |
2669 | tb, NDA_MAX, nda_policy, | |
2670 | extack); | |
51183d23 | 2671 | } else { |
8cb08174 JB |
2672 | err = nlmsg_parse_deprecated(nlh, sizeof(struct ndmsg), tb, |
2673 | NDA_MAX, nda_policy, extack); | |
51183d23 DA |
2674 | } |
2675 | if (err < 0) | |
2676 | return err; | |
2677 | ||
2678 | for (i = 0; i <= NDA_MAX; ++i) { | |
2679 | if (!tb[i]) | |
2680 | continue; | |
2681 | ||
2682 | /* all new attributes should require strict_check */ | |
2683 | switch (i) { | |
2684 | case NDA_IFINDEX: | |
51183d23 DA |
2685 | filter->dev_idx = nla_get_u32(tb[i]); |
2686 | break; | |
2687 | case NDA_MASTER: | |
51183d23 DA |
2688 | filter->master_idx = nla_get_u32(tb[i]); |
2689 | break; | |
2690 | default: | |
2691 | if (strict_check) { | |
2692 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor dump request"); | |
2693 | return -EINVAL; | |
2694 | } | |
2695 | } | |
2696 | } | |
2697 | ||
2698 | return 0; | |
2699 | } | |
2700 | ||
c8822a4e | 2701 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2702 | { |
6f52f80e DA |
2703 | const struct nlmsghdr *nlh = cb->nlh; |
2704 | struct neigh_dump_filter filter = {}; | |
1da177e4 LT |
2705 | struct neigh_table *tbl; |
2706 | int t, family, s_t; | |
84920c14 | 2707 | int proxy = 0; |
4bd6683b | 2708 | int err; |
1da177e4 | 2709 | |
6f52f80e | 2710 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; |
84920c14 TZ |
2711 | |
2712 | /* check for full ndmsg structure presence, family member is | |
2713 | * the same for both structures | |
2714 | */ | |
6f52f80e DA |
2715 | if (nlmsg_len(nlh) >= sizeof(struct ndmsg) && |
2716 | ((struct ndmsg *)nlmsg_data(nlh))->ndm_flags == NTF_PROXY) | |
84920c14 TZ |
2717 | proxy = 1; |
2718 | ||
51183d23 DA |
2719 | err = neigh_valid_dump_req(nlh, cb->strict_check, &filter, cb->extack); |
2720 | if (err < 0 && cb->strict_check) | |
2721 | return err; | |
2722 | ||
1da177e4 LT |
2723 | s_t = cb->args[0]; |
2724 | ||
d7480fd3 WC |
2725 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2726 | tbl = neigh_tables[t]; | |
2727 | ||
2728 | if (!tbl) | |
2729 | continue; | |
1da177e4 LT |
2730 | if (t < s_t || (family && tbl->family != family)) |
2731 | continue; | |
2732 | if (t > s_t) | |
2733 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2734 | sizeof(cb->args[0])); | |
84920c14 | 2735 | if (proxy) |
6f52f80e | 2736 | err = pneigh_dump_table(tbl, skb, cb, &filter); |
84920c14 | 2737 | else |
6f52f80e | 2738 | err = neigh_dump_table(tbl, skb, cb, &filter); |
4bd6683b ED |
2739 | if (err < 0) |
2740 | break; | |
1da177e4 | 2741 | } |
1da177e4 LT |
2742 | |
2743 | cb->args[0] = t; | |
2744 | return skb->len; | |
2745 | } | |
2746 | ||
82cbb5c6 RP |
2747 | static int neigh_valid_get_req(const struct nlmsghdr *nlh, |
2748 | struct neigh_table **tbl, | |
2749 | void **dst, int *dev_idx, u8 *ndm_flags, | |
2750 | struct netlink_ext_ack *extack) | |
2751 | { | |
2752 | struct nlattr *tb[NDA_MAX + 1]; | |
2753 | struct ndmsg *ndm; | |
2754 | int err, i; | |
2755 | ||
2756 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2757 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request"); | |
2758 | return -EINVAL; | |
2759 | } | |
2760 | ||
2761 | ndm = nlmsg_data(nlh); | |
2762 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || | |
2763 | ndm->ndm_type) { | |
2764 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request"); | |
2765 | return -EINVAL; | |
2766 | } | |
2767 | ||
2768 | if (ndm->ndm_flags & ~NTF_PROXY) { | |
2769 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request"); | |
2770 | return -EINVAL; | |
2771 | } | |
2772 | ||
8cb08174 JB |
2773 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, |
2774 | NDA_MAX, nda_policy, extack); | |
82cbb5c6 RP |
2775 | if (err < 0) |
2776 | return err; | |
2777 | ||
2778 | *ndm_flags = ndm->ndm_flags; | |
2779 | *dev_idx = ndm->ndm_ifindex; | |
2780 | *tbl = neigh_find_table(ndm->ndm_family); | |
2781 | if (*tbl == NULL) { | |
2782 | NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request"); | |
2783 | return -EAFNOSUPPORT; | |
2784 | } | |
2785 | ||
2786 | for (i = 0; i <= NDA_MAX; ++i) { | |
2787 | if (!tb[i]) | |
2788 | continue; | |
2789 | ||
2790 | switch (i) { | |
2791 | case NDA_DST: | |
2792 | if (nla_len(tb[i]) != (int)(*tbl)->key_len) { | |
2793 | NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request"); | |
2794 | return -EINVAL; | |
2795 | } | |
2796 | *dst = nla_data(tb[i]); | |
2797 | break; | |
2798 | default: | |
2799 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request"); | |
2800 | return -EINVAL; | |
2801 | } | |
2802 | } | |
2803 | ||
2804 | return 0; | |
2805 | } | |
2806 | ||
2807 | static inline size_t neigh_nlmsg_size(void) | |
2808 | { | |
2809 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2810 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2811 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2812 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2813 | + nla_total_size(4) /* NDA_PROBES */ | |
2814 | + nla_total_size(1); /* NDA_PROTOCOL */ | |
2815 | } | |
2816 | ||
2817 | static int neigh_get_reply(struct net *net, struct neighbour *neigh, | |
2818 | u32 pid, u32 seq) | |
2819 | { | |
2820 | struct sk_buff *skb; | |
2821 | int err = 0; | |
2822 | ||
2823 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL); | |
2824 | if (!skb) | |
2825 | return -ENOBUFS; | |
2826 | ||
2827 | err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0); | |
2828 | if (err) { | |
2829 | kfree_skb(skb); | |
2830 | goto errout; | |
2831 | } | |
2832 | ||
2833 | err = rtnl_unicast(skb, net, pid); | |
2834 | errout: | |
2835 | return err; | |
2836 | } | |
2837 | ||
2838 | static inline size_t pneigh_nlmsg_size(void) | |
2839 | { | |
2840 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
463561e6 | 2841 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
82cbb5c6 RP |
2842 | + nla_total_size(1); /* NDA_PROTOCOL */ |
2843 | } | |
2844 | ||
2845 | static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh, | |
2846 | u32 pid, u32 seq, struct neigh_table *tbl) | |
2847 | { | |
2848 | struct sk_buff *skb; | |
2849 | int err = 0; | |
2850 | ||
2851 | skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL); | |
2852 | if (!skb) | |
2853 | return -ENOBUFS; | |
2854 | ||
2855 | err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl); | |
2856 | if (err) { | |
2857 | kfree_skb(skb); | |
2858 | goto errout; | |
2859 | } | |
2860 | ||
2861 | err = rtnl_unicast(skb, net, pid); | |
2862 | errout: | |
2863 | return err; | |
2864 | } | |
2865 | ||
2866 | static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, | |
2867 | struct netlink_ext_ack *extack) | |
2868 | { | |
2869 | struct net *net = sock_net(in_skb->sk); | |
2870 | struct net_device *dev = NULL; | |
2871 | struct neigh_table *tbl = NULL; | |
2872 | struct neighbour *neigh; | |
2873 | void *dst = NULL; | |
2874 | u8 ndm_flags = 0; | |
2875 | int dev_idx = 0; | |
2876 | int err; | |
2877 | ||
2878 | err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags, | |
2879 | extack); | |
2880 | if (err < 0) | |
2881 | return err; | |
2882 | ||
2883 | if (dev_idx) { | |
2884 | dev = __dev_get_by_index(net, dev_idx); | |
2885 | if (!dev) { | |
2886 | NL_SET_ERR_MSG(extack, "Unknown device ifindex"); | |
2887 | return -ENODEV; | |
2888 | } | |
2889 | } | |
2890 | ||
2891 | if (!dst) { | |
2892 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
2893 | return -EINVAL; | |
2894 | } | |
2895 | ||
2896 | if (ndm_flags & NTF_PROXY) { | |
2897 | struct pneigh_entry *pn; | |
2898 | ||
2899 | pn = pneigh_lookup(tbl, net, dst, dev, 0); | |
2900 | if (!pn) { | |
2901 | NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found"); | |
2902 | return -ENOENT; | |
2903 | } | |
2904 | return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid, | |
2905 | nlh->nlmsg_seq, tbl); | |
2906 | } | |
2907 | ||
2908 | if (!dev) { | |
2909 | NL_SET_ERR_MSG(extack, "No device specified"); | |
2910 | return -EINVAL; | |
2911 | } | |
2912 | ||
2913 | neigh = neigh_lookup(tbl, dst, dev); | |
2914 | if (!neigh) { | |
2915 | NL_SET_ERR_MSG(extack, "Neighbour entry not found"); | |
2916 | return -ENOENT; | |
2917 | } | |
2918 | ||
2919 | err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid, | |
2920 | nlh->nlmsg_seq); | |
2921 | ||
2922 | neigh_release(neigh); | |
2923 | ||
2924 | return err; | |
2925 | } | |
2926 | ||
1da177e4 LT |
2927 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
2928 | { | |
2929 | int chain; | |
d6bf7817 | 2930 | struct neigh_hash_table *nht; |
1da177e4 | 2931 | |
d6bf7817 ED |
2932 | rcu_read_lock_bh(); |
2933 | nht = rcu_dereference_bh(tbl->nht); | |
2934 | ||
767e97e1 | 2935 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2936 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2937 | struct neighbour *n; |
2938 | ||
767e97e1 ED |
2939 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2940 | n != NULL; | |
2941 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2942 | cb(n, cookie); |
2943 | } | |
d6bf7817 ED |
2944 | read_unlock(&tbl->lock); |
2945 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2946 | } |
2947 | EXPORT_SYMBOL(neigh_for_each); | |
2948 | ||
2949 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2950 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2951 | int (*cb)(struct neighbour *)) | |
2952 | { | |
2953 | int chain; | |
d6bf7817 | 2954 | struct neigh_hash_table *nht; |
1da177e4 | 2955 | |
d6bf7817 ED |
2956 | nht = rcu_dereference_protected(tbl->nht, |
2957 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2958 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2959 | struct neighbour *n; |
2960 | struct neighbour __rcu **np; | |
1da177e4 | 2961 | |
d6bf7817 | 2962 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2963 | while ((n = rcu_dereference_protected(*np, |
2964 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2965 | int release; |
2966 | ||
2967 | write_lock(&n->lock); | |
2968 | release = cb(n); | |
2969 | if (release) { | |
767e97e1 ED |
2970 | rcu_assign_pointer(*np, |
2971 | rcu_dereference_protected(n->next, | |
2972 | lockdep_is_held(&tbl->lock))); | |
58956317 | 2973 | neigh_mark_dead(n); |
1da177e4 LT |
2974 | } else |
2975 | np = &n->next; | |
2976 | write_unlock(&n->lock); | |
4f494554 TG |
2977 | if (release) |
2978 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2979 | } |
2980 | } | |
2981 | } | |
2982 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2983 | ||
b79bda3d | 2984 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2985 | const void *addr, struct sk_buff *skb) |
2986 | { | |
b79bda3d EB |
2987 | int err = -EAFNOSUPPORT; |
2988 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2989 | struct neigh_table *tbl; |
2990 | struct neighbour *neigh; | |
2991 | ||
b79bda3d | 2992 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2993 | if (!tbl) |
2994 | goto out; | |
b560f03d | 2995 | rcu_read_lock_bh(); |
4b2a2bfe DA |
2996 | if (index == NEIGH_ARP_TABLE) { |
2997 | u32 key = *((u32 *)addr); | |
2998 | ||
2999 | neigh = __ipv4_neigh_lookup_noref(dev, key); | |
3000 | } else { | |
3001 | neigh = __neigh_lookup_noref(tbl, addr, dev); | |
3002 | } | |
4fd3d7d9 EB |
3003 | if (!neigh) |
3004 | neigh = __neigh_create(tbl, addr, dev, false); | |
3005 | err = PTR_ERR(neigh); | |
b560f03d DB |
3006 | if (IS_ERR(neigh)) { |
3007 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 3008 | goto out_kfree_skb; |
b560f03d | 3009 | } |
4fd3d7d9 | 3010 | err = neigh->output(neigh, skb); |
b560f03d | 3011 | rcu_read_unlock_bh(); |
4fd3d7d9 | 3012 | } |
b79bda3d EB |
3013 | else if (index == NEIGH_LINK_TABLE) { |
3014 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
3015 | addr, NULL, skb->len); | |
3016 | if (err < 0) | |
3017 | goto out_kfree_skb; | |
3018 | err = dev_queue_xmit(skb); | |
3019 | } | |
4fd3d7d9 EB |
3020 | out: |
3021 | return err; | |
3022 | out_kfree_skb: | |
3023 | kfree_skb(skb); | |
3024 | goto out; | |
3025 | } | |
3026 | EXPORT_SYMBOL(neigh_xmit); | |
3027 | ||
1da177e4 LT |
3028 | #ifdef CONFIG_PROC_FS |
3029 | ||
3030 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
3031 | { | |
3032 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3033 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3034 | struct neigh_hash_table *nht = state->nht; |
1da177e4 | 3035 | struct neighbour *n = NULL; |
f530eed6 | 3036 | int bucket; |
1da177e4 LT |
3037 | |
3038 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 3039 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 3040 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
3041 | |
3042 | while (n) { | |
878628fb | 3043 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3044 | goto next; |
1da177e4 LT |
3045 | if (state->neigh_sub_iter) { |
3046 | loff_t fakep = 0; | |
3047 | void *v; | |
3048 | ||
3049 | v = state->neigh_sub_iter(state, n, &fakep); | |
3050 | if (!v) | |
3051 | goto next; | |
3052 | } | |
3053 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3054 | break; | |
3055 | if (n->nud_state & ~NUD_NOARP) | |
3056 | break; | |
767e97e1 ED |
3057 | next: |
3058 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3059 | } |
3060 | ||
3061 | if (n) | |
3062 | break; | |
3063 | } | |
3064 | state->bucket = bucket; | |
3065 | ||
3066 | return n; | |
3067 | } | |
3068 | ||
3069 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
3070 | struct neighbour *n, | |
3071 | loff_t *pos) | |
3072 | { | |
3073 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3074 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3075 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
3076 | |
3077 | if (state->neigh_sub_iter) { | |
3078 | void *v = state->neigh_sub_iter(state, n, pos); | |
3079 | if (v) | |
3080 | return n; | |
3081 | } | |
767e97e1 | 3082 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
3083 | |
3084 | while (1) { | |
3085 | while (n) { | |
878628fb | 3086 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3087 | goto next; |
1da177e4 LT |
3088 | if (state->neigh_sub_iter) { |
3089 | void *v = state->neigh_sub_iter(state, n, pos); | |
3090 | if (v) | |
3091 | return n; | |
3092 | goto next; | |
3093 | } | |
3094 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3095 | break; | |
3096 | ||
3097 | if (n->nud_state & ~NUD_NOARP) | |
3098 | break; | |
767e97e1 ED |
3099 | next: |
3100 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3101 | } |
3102 | ||
3103 | if (n) | |
3104 | break; | |
3105 | ||
cd089336 | 3106 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
3107 | break; |
3108 | ||
767e97e1 | 3109 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
3110 | } |
3111 | ||
3112 | if (n && pos) | |
3113 | --(*pos); | |
3114 | return n; | |
3115 | } | |
3116 | ||
3117 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3118 | { | |
3119 | struct neighbour *n = neigh_get_first(seq); | |
3120 | ||
3121 | if (n) { | |
745e2031 | 3122 | --(*pos); |
1da177e4 LT |
3123 | while (*pos) { |
3124 | n = neigh_get_next(seq, n, pos); | |
3125 | if (!n) | |
3126 | break; | |
3127 | } | |
3128 | } | |
3129 | return *pos ? NULL : n; | |
3130 | } | |
3131 | ||
3132 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
3133 | { | |
3134 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3135 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3136 | struct neigh_table *tbl = state->tbl; |
3137 | struct pneigh_entry *pn = NULL; | |
3138 | int bucket = state->bucket; | |
3139 | ||
3140 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
3141 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
3142 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 3143 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3144 | pn = pn->next; |
1da177e4 LT |
3145 | if (pn) |
3146 | break; | |
3147 | } | |
3148 | state->bucket = bucket; | |
3149 | ||
3150 | return pn; | |
3151 | } | |
3152 | ||
3153 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
3154 | struct pneigh_entry *pn, | |
3155 | loff_t *pos) | |
3156 | { | |
3157 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3158 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3159 | struct neigh_table *tbl = state->tbl; |
3160 | ||
df07a94c JBD |
3161 | do { |
3162 | pn = pn->next; | |
3163 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
3164 | ||
1da177e4 LT |
3165 | while (!pn) { |
3166 | if (++state->bucket > PNEIGH_HASHMASK) | |
3167 | break; | |
3168 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 3169 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3170 | pn = pn->next; |
1da177e4 LT |
3171 | if (pn) |
3172 | break; | |
3173 | } | |
3174 | ||
3175 | if (pn && pos) | |
3176 | --(*pos); | |
3177 | ||
3178 | return pn; | |
3179 | } | |
3180 | ||
3181 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3182 | { | |
3183 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
3184 | ||
3185 | if (pn) { | |
745e2031 | 3186 | --(*pos); |
1da177e4 LT |
3187 | while (*pos) { |
3188 | pn = pneigh_get_next(seq, pn, pos); | |
3189 | if (!pn) | |
3190 | break; | |
3191 | } | |
3192 | } | |
3193 | return *pos ? NULL : pn; | |
3194 | } | |
3195 | ||
3196 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
3197 | { | |
3198 | struct neigh_seq_state *state = seq->private; | |
3199 | void *rc; | |
745e2031 | 3200 | loff_t idxpos = *pos; |
1da177e4 | 3201 | |
745e2031 | 3202 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 3203 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 3204 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
3205 | |
3206 | return rc; | |
3207 | } | |
3208 | ||
3209 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
f3e92cb8 | 3210 | __acquires(tbl->lock) |
d6bf7817 | 3211 | __acquires(rcu_bh) |
1da177e4 LT |
3212 | { |
3213 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
3214 | |
3215 | state->tbl = tbl; | |
3216 | state->bucket = 0; | |
3217 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
3218 | ||
d6bf7817 ED |
3219 | rcu_read_lock_bh(); |
3220 | state->nht = rcu_dereference_bh(tbl->nht); | |
f3e92cb8 | 3221 | read_lock(&tbl->lock); |
767e97e1 | 3222 | |
745e2031 | 3223 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
3224 | } |
3225 | EXPORT_SYMBOL(neigh_seq_start); | |
3226 | ||
3227 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3228 | { | |
3229 | struct neigh_seq_state *state; | |
3230 | void *rc; | |
3231 | ||
3232 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 3233 | rc = neigh_get_first(seq); |
1da177e4 LT |
3234 | goto out; |
3235 | } | |
3236 | ||
3237 | state = seq->private; | |
3238 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
3239 | rc = neigh_get_next(seq, v, NULL); | |
3240 | if (rc) | |
3241 | goto out; | |
3242 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
3243 | rc = pneigh_get_first(seq); | |
3244 | } else { | |
3245 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
3246 | rc = pneigh_get_next(seq, v, NULL); | |
3247 | } | |
3248 | out: | |
3249 | ++(*pos); | |
3250 | return rc; | |
3251 | } | |
3252 | EXPORT_SYMBOL(neigh_seq_next); | |
3253 | ||
3254 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
f3e92cb8 | 3255 | __releases(tbl->lock) |
d6bf7817 | 3256 | __releases(rcu_bh) |
1da177e4 | 3257 | { |
f3e92cb8 ED |
3258 | struct neigh_seq_state *state = seq->private; |
3259 | struct neigh_table *tbl = state->tbl; | |
3260 | ||
3261 | read_unlock(&tbl->lock); | |
d6bf7817 | 3262 | rcu_read_unlock_bh(); |
1da177e4 LT |
3263 | } |
3264 | EXPORT_SYMBOL(neigh_seq_stop); | |
3265 | ||
3266 | /* statistics via seq_file */ | |
3267 | ||
3268 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
3269 | { | |
71a5053a | 3270 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3271 | int cpu; |
3272 | ||
3273 | if (*pos == 0) | |
3274 | return SEQ_START_TOKEN; | |
4ec93edb | 3275 | |
0f23174a | 3276 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3277 | if (!cpu_possible(cpu)) |
3278 | continue; | |
3279 | *pos = cpu+1; | |
3280 | return per_cpu_ptr(tbl->stats, cpu); | |
3281 | } | |
3282 | return NULL; | |
3283 | } | |
3284 | ||
3285 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3286 | { | |
71a5053a | 3287 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3288 | int cpu; |
3289 | ||
0f23174a | 3290 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3291 | if (!cpu_possible(cpu)) |
3292 | continue; | |
3293 | *pos = cpu+1; | |
3294 | return per_cpu_ptr(tbl->stats, cpu); | |
3295 | } | |
3296 | return NULL; | |
3297 | } | |
3298 | ||
3299 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
3300 | { | |
3301 | ||
3302 | } | |
3303 | ||
3304 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
3305 | { | |
71a5053a | 3306 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3307 | struct neigh_statistics *st = v; |
3308 | ||
3309 | if (v == SEQ_START_TOKEN) { | |
fb811395 | 3310 | 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 table_fulls\n"); |
1da177e4 LT |
3311 | return 0; |
3312 | } | |
3313 | ||
3314 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
fb811395 | 3315 | "%08lx %08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
3316 | atomic_read(&tbl->entries), |
3317 | ||
3318 | st->allocs, | |
3319 | st->destroys, | |
3320 | st->hash_grows, | |
3321 | ||
3322 | st->lookups, | |
3323 | st->hits, | |
3324 | ||
3325 | st->res_failed, | |
3326 | ||
3327 | st->rcv_probes_mcast, | |
3328 | st->rcv_probes_ucast, | |
3329 | ||
3330 | st->periodic_gc_runs, | |
9a6d276e | 3331 | st->forced_gc_runs, |
fb811395 RJ |
3332 | st->unres_discards, |
3333 | st->table_fulls | |
1da177e4 LT |
3334 | ); |
3335 | ||
3336 | return 0; | |
3337 | } | |
3338 | ||
f690808e | 3339 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
3340 | .start = neigh_stat_seq_start, |
3341 | .next = neigh_stat_seq_next, | |
3342 | .stop = neigh_stat_seq_stop, | |
3343 | .show = neigh_stat_seq_show, | |
3344 | }; | |
1da177e4 LT |
3345 | #endif /* CONFIG_PROC_FS */ |
3346 | ||
7b8f7a40 RP |
3347 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
3348 | u32 pid) | |
1da177e4 | 3349 | { |
c346dca1 | 3350 | struct net *net = dev_net(n->dev); |
8b8aec50 | 3351 | struct sk_buff *skb; |
b8673311 | 3352 | int err = -ENOBUFS; |
1da177e4 | 3353 | |
339bf98f | 3354 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 3355 | if (skb == NULL) |
b8673311 | 3356 | goto errout; |
1da177e4 | 3357 | |
7b8f7a40 | 3358 | err = neigh_fill_info(skb, n, pid, 0, type, flags); |
26932566 PM |
3359 | if (err < 0) { |
3360 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
3361 | WARN_ON(err == -EMSGSIZE); | |
3362 | kfree_skb(skb); | |
3363 | goto errout; | |
3364 | } | |
1ce85fe4 PNA |
3365 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
3366 | return; | |
b8673311 TG |
3367 | errout: |
3368 | if (err < 0) | |
426b5303 | 3369 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
3370 | } |
3371 | ||
b8673311 | 3372 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 3373 | { |
7b8f7a40 | 3374 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0); |
b8673311 | 3375 | } |
0a204500 | 3376 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
3377 | |
3378 | #ifdef CONFIG_SYSCTL | |
b93196dc | 3379 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 3380 | |
fe2c6338 JP |
3381 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
3382 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
3383 | { |
3384 | int size, ret; | |
fe2c6338 | 3385 | struct ctl_table tmp = *ctl; |
8b5c171b | 3386 | |
eec4844f | 3387 | tmp.extra1 = SYSCTL_ZERO; |
ce46cc64 | 3388 | tmp.extra2 = &unres_qlen_max; |
8b5c171b | 3389 | tmp.data = &size; |
ce46cc64 SW |
3390 | |
3391 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
3392 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
3393 | ||
8b5c171b ED |
3394 | if (write && !ret) |
3395 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
3396 | return ret; | |
3397 | } | |
3398 | ||
1d4c8c29 JP |
3399 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
3400 | int family) | |
3401 | { | |
bba24896 JP |
3402 | switch (family) { |
3403 | case AF_INET: | |
1d4c8c29 | 3404 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
3405 | case AF_INET6: |
3406 | return __in6_dev_nd_parms_get_rcu(dev); | |
3407 | } | |
1d4c8c29 JP |
3408 | return NULL; |
3409 | } | |
3410 | ||
3411 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
3412 | int index) | |
3413 | { | |
3414 | struct net_device *dev; | |
3415 | int family = neigh_parms_family(p); | |
3416 | ||
3417 | rcu_read_lock(); | |
3418 | for_each_netdev_rcu(net, dev) { | |
3419 | struct neigh_parms *dst_p = | |
3420 | neigh_get_dev_parms_rcu(dev, family); | |
3421 | ||
3422 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
3423 | dst_p->data[index] = p->data[index]; | |
3424 | } | |
3425 | rcu_read_unlock(); | |
3426 | } | |
3427 | ||
3428 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
3429 | { | |
3430 | struct net_device *dev = ctl->extra1; | |
3431 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 3432 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
3433 | int index = (int *) ctl->data - p->data; |
3434 | ||
3435 | if (!write) | |
3436 | return; | |
3437 | ||
3438 | set_bit(index, p->data_state); | |
7627ae60 MH |
3439 | if (index == NEIGH_VAR_DELAY_PROBE_TIME) |
3440 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); | |
1d4c8c29 JP |
3441 | if (!dev) /* NULL dev means this is default value */ |
3442 | neigh_copy_dflt_parms(net, p, index); | |
3443 | } | |
3444 | ||
1f9248e5 JP |
3445 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
3446 | void __user *buffer, | |
3447 | size_t *lenp, loff_t *ppos) | |
3448 | { | |
3449 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 3450 | int ret; |
1f9248e5 | 3451 | |
eec4844f MC |
3452 | tmp.extra1 = SYSCTL_ZERO; |
3453 | tmp.extra2 = SYSCTL_INT_MAX; | |
1f9248e5 | 3454 | |
1d4c8c29 JP |
3455 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
3456 | neigh_proc_update(ctl, write); | |
3457 | return ret; | |
1f9248e5 JP |
3458 | } |
3459 | ||
cb5b09c1 JP |
3460 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
3461 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3462 | { | |
1d4c8c29 JP |
3463 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
3464 | ||
3465 | neigh_proc_update(ctl, write); | |
3466 | return ret; | |
cb5b09c1 JP |
3467 | } |
3468 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
3469 | ||
3470 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
3471 | void __user *buffer, | |
3472 | size_t *lenp, loff_t *ppos) | |
3473 | { | |
1d4c8c29 JP |
3474 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
3475 | ||
3476 | neigh_proc_update(ctl, write); | |
3477 | return ret; | |
cb5b09c1 JP |
3478 | } |
3479 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
3480 | ||
3481 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
3482 | void __user *buffer, | |
3483 | size_t *lenp, loff_t *ppos) | |
3484 | { | |
1d4c8c29 JP |
3485 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
3486 | ||
3487 | neigh_proc_update(ctl, write); | |
3488 | return ret; | |
cb5b09c1 JP |
3489 | } |
3490 | ||
3491 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
3492 | void __user *buffer, | |
3493 | size_t *lenp, loff_t *ppos) | |
3494 | { | |
1d4c8c29 JP |
3495 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
3496 | ||
3497 | neigh_proc_update(ctl, write); | |
3498 | return ret; | |
cb5b09c1 JP |
3499 | } |
3500 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
3501 | ||
3502 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
3503 | void __user *buffer, | |
3504 | size_t *lenp, loff_t *ppos) | |
3505 | { | |
1d4c8c29 JP |
3506 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
3507 | ||
3508 | neigh_proc_update(ctl, write); | |
3509 | return ret; | |
cb5b09c1 JP |
3510 | } |
3511 | ||
4bf6980d JFR |
3512 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
3513 | void __user *buffer, | |
3514 | size_t *lenp, loff_t *ppos) | |
3515 | { | |
3516 | struct neigh_parms *p = ctl->extra2; | |
3517 | int ret; | |
3518 | ||
3519 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3520 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3521 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3522 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3523 | else | |
3524 | ret = -1; | |
3525 | ||
3526 | if (write && ret == 0) { | |
3527 | /* update reachable_time as well, otherwise, the change will | |
3528 | * only be effective after the next time neigh_periodic_work | |
3529 | * decides to recompute it | |
3530 | */ | |
3531 | p->reachable_time = | |
3532 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3533 | } | |
3534 | return ret; | |
3535 | } | |
3536 | ||
1f9248e5 JP |
3537 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3538 | (&((struct neigh_parms *) 0)->data[index]) | |
3539 | ||
3540 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3541 | [NEIGH_VAR_ ## attr] = { \ | |
3542 | .procname = name, \ | |
3543 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3544 | .maxlen = sizeof(int), \ | |
3545 | .mode = mval, \ | |
3546 | .proc_handler = proc, \ | |
3547 | } | |
3548 | ||
3549 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3550 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3551 | ||
3552 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3553 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3554 | |
3555 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3556 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 JP |
3557 | |
3558 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3559 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3560 | |
3561 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3562 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3563 | |
3564 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3565 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3566 | |
1da177e4 LT |
3567 | static struct neigh_sysctl_table { |
3568 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3569 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3570 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3571 | .neigh_vars = { |
1f9248e5 JP |
3572 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3573 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3574 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3575 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3576 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3577 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3578 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3579 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3580 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3581 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3582 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3583 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3584 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3585 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3586 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3587 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3588 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3589 | .procname = "gc_interval", |
3590 | .maxlen = sizeof(int), | |
3591 | .mode = 0644, | |
6d9f239a | 3592 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3593 | }, |
8b5c171b | 3594 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3595 | .procname = "gc_thresh1", |
3596 | .maxlen = sizeof(int), | |
3597 | .mode = 0644, | |
eec4844f MC |
3598 | .extra1 = SYSCTL_ZERO, |
3599 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3600 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3601 | }, |
8b5c171b | 3602 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3603 | .procname = "gc_thresh2", |
3604 | .maxlen = sizeof(int), | |
3605 | .mode = 0644, | |
eec4844f MC |
3606 | .extra1 = SYSCTL_ZERO, |
3607 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3608 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3609 | }, |
8b5c171b | 3610 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3611 | .procname = "gc_thresh3", |
3612 | .maxlen = sizeof(int), | |
3613 | .mode = 0644, | |
eec4844f MC |
3614 | .extra1 = SYSCTL_ZERO, |
3615 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3616 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3617 | }, |
c3bac5a7 | 3618 | {}, |
1da177e4 LT |
3619 | }, |
3620 | }; | |
3621 | ||
3622 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3623 | proc_handler *handler) |
1da177e4 | 3624 | { |
1f9248e5 | 3625 | int i; |
3c607bbb | 3626 | struct neigh_sysctl_table *t; |
1f9248e5 | 3627 | const char *dev_name_source; |
8f40a1f9 | 3628 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3629 | char *p_name; |
1da177e4 | 3630 | |
3c607bbb | 3631 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3632 | if (!t) |
3c607bbb PE |
3633 | goto err; |
3634 | ||
b194c1f1 | 3635 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3636 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3637 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3638 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3639 | } |
1da177e4 LT |
3640 | |
3641 | if (dev) { | |
3642 | dev_name_source = dev->name; | |
d12af679 | 3643 | /* Terminate the table early */ |
8b5c171b ED |
3644 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3645 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3646 | } else { |
9ecf07a1 | 3647 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3648 | dev_name_source = "default"; |
9ecf07a1 MK |
3649 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3650 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3651 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3652 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3653 | } |
3654 | ||
f8572d8f | 3655 | if (handler) { |
1da177e4 | 3656 | /* RetransTime */ |
8b5c171b | 3657 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3658 | /* ReachableTime */ |
8b5c171b | 3659 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3660 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3661 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3662 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3663 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3664 | } else { |
3665 | /* Those handlers will update p->reachable_time after | |
3666 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3667 | * applied after the next neighbour update instead of waiting for | |
3668 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3669 | * So any handler that replaces them should do this as well | |
3670 | */ | |
3671 | /* ReachableTime */ | |
3672 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3673 | neigh_proc_base_reachable_time; | |
3674 | /* ReachableTime (in milliseconds) */ | |
3675 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3676 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3677 | } |
3678 | ||
464dc801 EB |
3679 | /* Don't export sysctls to unprivileged users */ |
3680 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3681 | t->neigh_vars[0].procname = NULL; | |
3682 | ||
73af614a JP |
3683 | switch (neigh_parms_family(p)) { |
3684 | case AF_INET: | |
3685 | p_name = "ipv4"; | |
3686 | break; | |
3687 | case AF_INET6: | |
3688 | p_name = "ipv6"; | |
3689 | break; | |
3690 | default: | |
3691 | BUG(); | |
3692 | } | |
3693 | ||
8f40a1f9 EB |
3694 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3695 | p_name, dev_name_source); | |
4ab438fc | 3696 | t->sysctl_header = |
8f40a1f9 | 3697 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3698 | if (!t->sysctl_header) |
8f40a1f9 | 3699 | goto free; |
3c607bbb | 3700 | |
1da177e4 LT |
3701 | p->sysctl_table = t; |
3702 | return 0; | |
3703 | ||
3c607bbb | 3704 | free: |
1da177e4 | 3705 | kfree(t); |
3c607bbb PE |
3706 | err: |
3707 | return -ENOBUFS; | |
1da177e4 | 3708 | } |
0a204500 | 3709 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3710 | |
3711 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3712 | { | |
3713 | if (p->sysctl_table) { | |
3714 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3715 | p->sysctl_table = NULL; | |
5dd3df10 | 3716 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3717 | kfree(t); |
3718 | } | |
3719 | } | |
0a204500 | 3720 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3721 | |
3722 | #endif /* CONFIG_SYSCTL */ | |
3723 | ||
c8822a4e TG |
3724 | static int __init neigh_init(void) |
3725 | { | |
b97bac64 FW |
3726 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0); |
3727 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0); | |
82cbb5c6 | 3728 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0); |
c8822a4e | 3729 | |
c7ac8679 | 3730 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
b97bac64 FW |
3731 | 0); |
3732 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, 0); | |
c8822a4e TG |
3733 | |
3734 | return 0; | |
3735 | } | |
3736 | ||
3737 | subsys_initcall(neigh_init); |