Commit | Line | Data |
---|---|---|
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 | ||
1da177e4 | 44 | #define NEIGH_DEBUG 1 |
d5d427cd JP |
45 | #define neigh_dbg(level, fmt, ...) \ |
46 | do { \ | |
47 | if (level <= NEIGH_DEBUG) \ | |
48 | pr_debug(fmt, ##__VA_ARGS__); \ | |
49 | } while (0) | |
1da177e4 LT |
50 | |
51 | #define PNEIGH_HASHMASK 0xF | |
52 | ||
e99e88a9 | 53 | static void neigh_timer_handler(struct timer_list *t); |
7b8f7a40 RP |
54 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
55 | u32 pid); | |
56 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid); | |
53b76cdf WB |
57 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
58 | struct net_device *dev); | |
1da177e4 | 59 | |
45fc3b11 | 60 | #ifdef CONFIG_PROC_FS |
71a5053a | 61 | static const struct seq_operations neigh_stat_seq_ops; |
45fc3b11 | 62 | #endif |
1da177e4 LT |
63 | |
64 | /* | |
65 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
66 | ||
67 | - All the scans/updates to hash buckets MUST be made under this lock. | |
68 | - NOTHING clever should be made under this lock: no callbacks | |
69 | to protocol backends, no attempts to send something to network. | |
70 | It will result in deadlocks, if backend/driver wants to use neighbour | |
71 | cache. | |
72 | - If the entry requires some non-trivial actions, increase | |
73 | its reference count and release table lock. | |
74 | ||
75 | Neighbour entries are protected: | |
76 | - with reference count. | |
77 | - with rwlock neigh->lock | |
78 | ||
79 | Reference count prevents destruction. | |
80 | ||
81 | neigh->lock mainly serializes ll address data and its validity state. | |
82 | However, the same lock is used to protect another entry fields: | |
83 | - timer | |
84 | - resolution queue | |
85 | ||
86 | Again, nothing clever shall be made under neigh->lock, | |
87 | the most complicated procedure, which we allow is dev->hard_header. | |
88 | It is supposed, that dev->hard_header is simplistic and does | |
89 | not make callbacks to neighbour tables. | |
1da177e4 LT |
90 | */ |
91 | ||
8f40b161 | 92 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
93 | { |
94 | kfree_skb(skb); | |
95 | return -ENETDOWN; | |
96 | } | |
97 | ||
4f494554 TG |
98 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
99 | { | |
56dd18a4 | 100 | trace_neigh_cleanup_and_release(neigh, 0); |
7b8f7a40 | 101 | __neigh_notify(neigh, RTM_DELNEIGH, 0, 0); |
53f800e3 | 102 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
4f494554 TG |
103 | neigh_release(neigh); |
104 | } | |
105 | ||
1da177e4 LT |
106 | /* |
107 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
108 | * It corresponds to default IPv6 settings and is not overridable, | |
109 | * because it is really reasonable choice. | |
110 | */ | |
111 | ||
112 | unsigned long neigh_rand_reach_time(unsigned long base) | |
113 | { | |
63862b5b | 114 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 115 | } |
0a204500 | 116 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 | 117 | |
58956317 DA |
118 | static void neigh_mark_dead(struct neighbour *n) |
119 | { | |
120 | n->dead = 1; | |
121 | if (!list_empty(&n->gc_list)) { | |
122 | list_del_init(&n->gc_list); | |
123 | atomic_dec(&n->tbl->gc_entries); | |
124 | } | |
125 | } | |
126 | ||
9c29a2f5 | 127 | static void neigh_update_gc_list(struct neighbour *n) |
58956317 | 128 | { |
e997f8a2 | 129 | bool on_gc_list, exempt_from_gc; |
58956317 | 130 | |
9c29a2f5 DA |
131 | write_lock_bh(&n->tbl->lock); |
132 | write_lock(&n->lock); | |
58956317 | 133 | |
e997f8a2 DA |
134 | /* remove from the gc list if new state is permanent or if neighbor |
135 | * is externally learned; otherwise entry should be on the gc list | |
58956317 | 136 | */ |
e997f8a2 DA |
137 | exempt_from_gc = n->nud_state & NUD_PERMANENT || |
138 | n->flags & NTF_EXT_LEARNED; | |
9c29a2f5 DA |
139 | on_gc_list = !list_empty(&n->gc_list); |
140 | ||
e997f8a2 | 141 | if (exempt_from_gc && on_gc_list) { |
58956317 DA |
142 | list_del_init(&n->gc_list); |
143 | atomic_dec(&n->tbl->gc_entries); | |
e997f8a2 | 144 | } else if (!exempt_from_gc && !on_gc_list) { |
58956317 DA |
145 | /* add entries to the tail; cleaning removes from the front */ |
146 | list_add_tail(&n->gc_list, &n->tbl->gc_list); | |
147 | atomic_inc(&n->tbl->gc_entries); | |
148 | } | |
9c29a2f5 DA |
149 | |
150 | write_unlock(&n->lock); | |
151 | write_unlock_bh(&n->tbl->lock); | |
58956317 | 152 | } |
1da177e4 | 153 | |
e997f8a2 | 154 | static bool neigh_update_ext_learned(struct neighbour *neigh, u32 flags, |
526f1b58 DA |
155 | int *notify) |
156 | { | |
e997f8a2 | 157 | bool rc = false; |
526f1b58 DA |
158 | u8 ndm_flags; |
159 | ||
160 | if (!(flags & NEIGH_UPDATE_F_ADMIN)) | |
e997f8a2 | 161 | return rc; |
526f1b58 DA |
162 | |
163 | ndm_flags = (flags & NEIGH_UPDATE_F_EXT_LEARNED) ? NTF_EXT_LEARNED : 0; | |
164 | if ((neigh->flags ^ ndm_flags) & NTF_EXT_LEARNED) { | |
165 | if (ndm_flags & NTF_EXT_LEARNED) | |
166 | neigh->flags |= NTF_EXT_LEARNED; | |
167 | else | |
168 | neigh->flags &= ~NTF_EXT_LEARNED; | |
e997f8a2 | 169 | rc = true; |
526f1b58 DA |
170 | *notify = 1; |
171 | } | |
e997f8a2 DA |
172 | |
173 | return rc; | |
526f1b58 DA |
174 | } |
175 | ||
7e6f182b DA |
176 | static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np, |
177 | struct neigh_table *tbl) | |
5071034e SV |
178 | { |
179 | bool retval = false; | |
180 | ||
181 | write_lock(&n->lock); | |
7e6f182b | 182 | if (refcount_read(&n->refcnt) == 1) { |
5071034e SV |
183 | struct neighbour *neigh; |
184 | ||
185 | neigh = rcu_dereference_protected(n->next, | |
186 | lockdep_is_held(&tbl->lock)); | |
187 | rcu_assign_pointer(*np, neigh); | |
58956317 | 188 | neigh_mark_dead(n); |
5071034e SV |
189 | retval = true; |
190 | } | |
191 | write_unlock(&n->lock); | |
192 | if (retval) | |
193 | neigh_cleanup_and_release(n); | |
194 | return retval; | |
195 | } | |
196 | ||
197 | bool neigh_remove_one(struct neighbour *ndel, struct neigh_table *tbl) | |
198 | { | |
199 | struct neigh_hash_table *nht; | |
200 | void *pkey = ndel->primary_key; | |
201 | u32 hash_val; | |
202 | struct neighbour *n; | |
203 | struct neighbour __rcu **np; | |
204 | ||
205 | nht = rcu_dereference_protected(tbl->nht, | |
206 | lockdep_is_held(&tbl->lock)); | |
207 | hash_val = tbl->hash(pkey, ndel->dev, nht->hash_rnd); | |
208 | hash_val = hash_val >> (32 - nht->hash_shift); | |
209 | ||
210 | np = &nht->hash_buckets[hash_val]; | |
211 | while ((n = rcu_dereference_protected(*np, | |
212 | lockdep_is_held(&tbl->lock)))) { | |
213 | if (n == ndel) | |
7e6f182b | 214 | return neigh_del(n, np, tbl); |
5071034e SV |
215 | np = &n->next; |
216 | } | |
217 | return false; | |
218 | } | |
219 | ||
1da177e4 LT |
220 | static int neigh_forced_gc(struct neigh_table *tbl) |
221 | { | |
58956317 DA |
222 | int max_clean = atomic_read(&tbl->gc_entries) - tbl->gc_thresh2; |
223 | unsigned long tref = jiffies - 5 * HZ; | |
58956317 | 224 | struct neighbour *n, *tmp; |
1da177e4 | 225 | int shrunk = 0; |
1da177e4 LT |
226 | |
227 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
228 | ||
229 | write_lock_bh(&tbl->lock); | |
1da177e4 | 230 | |
58956317 DA |
231 | list_for_each_entry_safe(n, tmp, &tbl->gc_list, gc_list) { |
232 | if (refcount_read(&n->refcnt) == 1) { | |
233 | bool remove = false; | |
234 | ||
235 | write_lock(&n->lock); | |
758a7f0b | 236 | if ((n->nud_state == NUD_FAILED) || |
8cf8821e JD |
237 | (tbl->is_multicast && |
238 | tbl->is_multicast(n->primary_key)) || | |
e997f8a2 | 239 | time_after(tref, n->updated)) |
58956317 DA |
240 | remove = true; |
241 | write_unlock(&n->lock); | |
242 | ||
243 | if (remove && neigh_remove_one(n, tbl)) | |
244 | shrunk++; | |
245 | if (shrunk >= max_clean) | |
246 | break; | |
1da177e4 LT |
247 | } |
248 | } | |
249 | ||
250 | tbl->last_flush = jiffies; | |
251 | ||
252 | write_unlock_bh(&tbl->lock); | |
253 | ||
254 | return shrunk; | |
255 | } | |
256 | ||
a43d8994 PE |
257 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
258 | { | |
259 | neigh_hold(n); | |
260 | if (unlikely(mod_timer(&n->timer, when))) { | |
261 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
262 | n->nud_state); | |
263 | dump_stack(); | |
264 | } | |
265 | } | |
266 | ||
1da177e4 LT |
267 | static int neigh_del_timer(struct neighbour *n) |
268 | { | |
269 | if ((n->nud_state & NUD_IN_TIMER) && | |
270 | del_timer(&n->timer)) { | |
271 | neigh_release(n); | |
272 | return 1; | |
273 | } | |
274 | return 0; | |
275 | } | |
276 | ||
277 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
278 | { | |
279 | struct sk_buff *skb; | |
280 | ||
281 | while ((skb = skb_dequeue(list)) != NULL) { | |
282 | dev_put(skb->dev); | |
283 | kfree_skb(skb); | |
284 | } | |
285 | } | |
286 | ||
859bd2ef DA |
287 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev, |
288 | bool skip_perm) | |
1da177e4 LT |
289 | { |
290 | int i; | |
d6bf7817 | 291 | struct neigh_hash_table *nht; |
1da177e4 | 292 | |
d6bf7817 ED |
293 | nht = rcu_dereference_protected(tbl->nht, |
294 | lockdep_is_held(&tbl->lock)); | |
295 | ||
cd089336 | 296 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
297 | struct neighbour *n; |
298 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 299 | |
767e97e1 ED |
300 | while ((n = rcu_dereference_protected(*np, |
301 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
302 | if (dev && n->dev != dev) { |
303 | np = &n->next; | |
304 | continue; | |
305 | } | |
859bd2ef DA |
306 | if (skip_perm && n->nud_state & NUD_PERMANENT) { |
307 | np = &n->next; | |
308 | continue; | |
309 | } | |
767e97e1 ED |
310 | rcu_assign_pointer(*np, |
311 | rcu_dereference_protected(n->next, | |
312 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
313 | write_lock(&n->lock); |
314 | neigh_del_timer(n); | |
58956317 | 315 | neigh_mark_dead(n); |
9f237430 | 316 | if (refcount_read(&n->refcnt) != 1) { |
1da177e4 LT |
317 | /* The most unpleasant situation. |
318 | We must destroy neighbour entry, | |
319 | but someone still uses it. | |
320 | ||
321 | The destroy will be delayed until | |
322 | the last user releases us, but | |
323 | we must kill timers etc. and move | |
324 | it to safe state. | |
325 | */ | |
c9ab4d85 | 326 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 327 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
328 | n->output = neigh_blackhole; |
329 | if (n->nud_state & NUD_VALID) | |
330 | n->nud_state = NUD_NOARP; | |
331 | else | |
332 | n->nud_state = NUD_NONE; | |
d5d427cd | 333 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
334 | } |
335 | write_unlock(&n->lock); | |
4f494554 | 336 | neigh_cleanup_and_release(n); |
1da177e4 LT |
337 | } |
338 | } | |
49636bb1 | 339 | } |
1da177e4 | 340 | |
49636bb1 HX |
341 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
342 | { | |
343 | write_lock_bh(&tbl->lock); | |
859bd2ef | 344 | neigh_flush_dev(tbl, dev, false); |
49636bb1 HX |
345 | write_unlock_bh(&tbl->lock); |
346 | } | |
0a204500 | 347 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 | 348 | |
859bd2ef DA |
349 | static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev, |
350 | bool skip_perm) | |
49636bb1 HX |
351 | { |
352 | write_lock_bh(&tbl->lock); | |
859bd2ef | 353 | neigh_flush_dev(tbl, dev, skip_perm); |
53b76cdf | 354 | pneigh_ifdown_and_unlock(tbl, dev); |
1da177e4 LT |
355 | |
356 | del_timer_sync(&tbl->proxy_timer); | |
357 | pneigh_queue_purge(&tbl->proxy_queue); | |
358 | return 0; | |
359 | } | |
859bd2ef DA |
360 | |
361 | int neigh_carrier_down(struct neigh_table *tbl, struct net_device *dev) | |
362 | { | |
363 | __neigh_ifdown(tbl, dev, true); | |
364 | return 0; | |
365 | } | |
366 | EXPORT_SYMBOL(neigh_carrier_down); | |
367 | ||
368 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
369 | { | |
370 | __neigh_ifdown(tbl, dev, false); | |
371 | return 0; | |
372 | } | |
0a204500 | 373 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 374 | |
58956317 DA |
375 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, |
376 | struct net_device *dev, | |
e997f8a2 | 377 | bool exempt_from_gc) |
1da177e4 LT |
378 | { |
379 | struct neighbour *n = NULL; | |
380 | unsigned long now = jiffies; | |
381 | int entries; | |
382 | ||
e997f8a2 | 383 | if (exempt_from_gc) |
58956317 DA |
384 | goto do_alloc; |
385 | ||
386 | entries = atomic_inc_return(&tbl->gc_entries) - 1; | |
1da177e4 LT |
387 | if (entries >= tbl->gc_thresh3 || |
388 | (entries >= tbl->gc_thresh2 && | |
389 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
390 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
391 | entries >= tbl->gc_thresh3) { |
392 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
393 | tbl->id); | |
394 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 395 | goto out_entries; |
fb811395 | 396 | } |
1da177e4 LT |
397 | } |
398 | ||
58956317 | 399 | do_alloc: |
08433eff | 400 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
401 | if (!n) |
402 | goto out_entries; | |
403 | ||
c9ab4d85 | 404 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 405 | rwlock_init(&n->lock); |
0ed8ddf4 | 406 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
407 | n->updated = n->used = now; |
408 | n->nud_state = NUD_NONE; | |
409 | n->output = neigh_blackhole; | |
f6b72b62 | 410 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 411 | n->parms = neigh_parms_clone(&tbl->parms); |
e99e88a9 | 412 | timer_setup(&n->timer, neigh_timer_handler, 0); |
1da177e4 LT |
413 | |
414 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
415 | n->tbl = tbl; | |
9f237430 | 416 | refcount_set(&n->refcnt, 1); |
1da177e4 | 417 | n->dead = 1; |
8cc196d6 | 418 | INIT_LIST_HEAD(&n->gc_list); |
58956317 DA |
419 | |
420 | atomic_inc(&tbl->entries); | |
1da177e4 LT |
421 | out: |
422 | return n; | |
423 | ||
424 | out_entries: | |
e997f8a2 | 425 | if (!exempt_from_gc) |
58956317 | 426 | atomic_dec(&tbl->gc_entries); |
1da177e4 LT |
427 | goto out; |
428 | } | |
429 | ||
2c2aba6c DM |
430 | static void neigh_get_hash_rnd(u32 *x) |
431 | { | |
b3d0f789 | 432 | *x = get_random_u32() | 1; |
2c2aba6c DM |
433 | } |
434 | ||
cd089336 | 435 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 436 | { |
cd089336 | 437 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 438 | struct neigh_hash_table *ret; |
6193d2be | 439 | struct neighbour __rcu **buckets; |
2c2aba6c | 440 | int i; |
1da177e4 | 441 | |
d6bf7817 ED |
442 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
443 | if (!ret) | |
444 | return NULL; | |
85704cb8 | 445 | if (size <= PAGE_SIZE) { |
d6bf7817 | 446 | buckets = kzalloc(size, GFP_ATOMIC); |
85704cb8 | 447 | } else { |
6193d2be | 448 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
449 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
450 | get_order(size)); | |
01b833ab | 451 | kmemleak_alloc(buckets, size, 1, GFP_ATOMIC); |
85704cb8 | 452 | } |
d6bf7817 ED |
453 | if (!buckets) { |
454 | kfree(ret); | |
455 | return NULL; | |
1da177e4 | 456 | } |
6193d2be | 457 | ret->hash_buckets = buckets; |
cd089336 | 458 | ret->hash_shift = shift; |
2c2aba6c DM |
459 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
460 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
461 | return ret; |
462 | } | |
463 | ||
d6bf7817 | 464 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 465 | { |
d6bf7817 ED |
466 | struct neigh_hash_table *nht = container_of(head, |
467 | struct neigh_hash_table, | |
468 | rcu); | |
cd089336 | 469 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 470 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 | 471 | |
85704cb8 | 472 | if (size <= PAGE_SIZE) { |
d6bf7817 | 473 | kfree(buckets); |
85704cb8 KK |
474 | } else { |
475 | kmemleak_free(buckets); | |
d6bf7817 | 476 | free_pages((unsigned long)buckets, get_order(size)); |
85704cb8 | 477 | } |
d6bf7817 | 478 | kfree(nht); |
1da177e4 LT |
479 | } |
480 | ||
d6bf7817 | 481 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 482 | unsigned long new_shift) |
1da177e4 | 483 | { |
d6bf7817 ED |
484 | unsigned int i, hash; |
485 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
486 | |
487 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
488 | ||
d6bf7817 ED |
489 | old_nht = rcu_dereference_protected(tbl->nht, |
490 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 491 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
492 | if (!new_nht) |
493 | return old_nht; | |
1da177e4 | 494 | |
cd089336 | 495 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
496 | struct neighbour *n, *next; |
497 | ||
767e97e1 ED |
498 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
499 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
500 | n != NULL; |
501 | n = next) { | |
502 | hash = tbl->hash(n->primary_key, n->dev, | |
503 | new_nht->hash_rnd); | |
1da177e4 | 504 | |
cd089336 | 505 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
506 | next = rcu_dereference_protected(n->next, |
507 | lockdep_is_held(&tbl->lock)); | |
508 | ||
509 | rcu_assign_pointer(n->next, | |
510 | rcu_dereference_protected( | |
511 | new_nht->hash_buckets[hash], | |
512 | lockdep_is_held(&tbl->lock))); | |
513 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
514 | } |
515 | } | |
1da177e4 | 516 | |
d6bf7817 ED |
517 | rcu_assign_pointer(tbl->nht, new_nht); |
518 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
519 | return new_nht; | |
1da177e4 LT |
520 | } |
521 | ||
522 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
523 | struct net_device *dev) | |
524 | { | |
525 | struct neighbour *n; | |
4ec93edb | 526 | |
1da177e4 LT |
527 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
528 | ||
d6bf7817 | 529 | rcu_read_lock_bh(); |
60395a20 EB |
530 | n = __neigh_lookup_noref(tbl, pkey, dev); |
531 | if (n) { | |
9f237430 | 532 | if (!refcount_inc_not_zero(&n->refcnt)) |
60395a20 EB |
533 | n = NULL; |
534 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 535 | } |
767e97e1 | 536 | |
d6bf7817 | 537 | rcu_read_unlock_bh(); |
1da177e4 LT |
538 | return n; |
539 | } | |
0a204500 | 540 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 541 | |
426b5303 EB |
542 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
543 | const void *pkey) | |
1da177e4 LT |
544 | { |
545 | struct neighbour *n; | |
01ccdf12 | 546 | unsigned int key_len = tbl->key_len; |
bc4bf5f3 | 547 | u32 hash_val; |
d6bf7817 | 548 | struct neigh_hash_table *nht; |
1da177e4 LT |
549 | |
550 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
551 | ||
d6bf7817 ED |
552 | rcu_read_lock_bh(); |
553 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 554 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
555 | |
556 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
557 | n != NULL; | |
558 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 559 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 560 | net_eq(dev_net(n->dev), net)) { |
9f237430 | 561 | if (!refcount_inc_not_zero(&n->refcnt)) |
767e97e1 | 562 | n = NULL; |
1da177e4 LT |
563 | NEIGH_CACHE_STAT_INC(tbl, hits); |
564 | break; | |
565 | } | |
566 | } | |
767e97e1 | 567 | |
d6bf7817 | 568 | rcu_read_unlock_bh(); |
1da177e4 LT |
569 | return n; |
570 | } | |
0a204500 | 571 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 572 | |
58956317 DA |
573 | static struct neighbour *___neigh_create(struct neigh_table *tbl, |
574 | const void *pkey, | |
575 | struct net_device *dev, | |
e997f8a2 | 576 | bool exempt_from_gc, bool want_ref) |
1da177e4 | 577 | { |
e997f8a2 | 578 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev, exempt_from_gc); |
1da177e4 | 579 | u32 hash_val; |
01ccdf12 | 580 | unsigned int key_len = tbl->key_len; |
1da177e4 | 581 | int error; |
d6bf7817 | 582 | struct neigh_hash_table *nht; |
1da177e4 | 583 | |
fc651001 DA |
584 | trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc); |
585 | ||
1da177e4 LT |
586 | if (!n) { |
587 | rc = ERR_PTR(-ENOBUFS); | |
588 | goto out; | |
589 | } | |
590 | ||
591 | memcpy(n->primary_key, pkey, key_len); | |
592 | n->dev = dev; | |
593 | dev_hold(dev); | |
594 | ||
595 | /* Protocol specific setup. */ | |
596 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
597 | rc = ERR_PTR(error); | |
598 | goto out_neigh_release; | |
599 | } | |
600 | ||
da6a8fa0 | 601 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 602 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
603 | if (error < 0) { |
604 | rc = ERR_PTR(error); | |
605 | goto out_neigh_release; | |
606 | } | |
607 | } | |
608 | ||
447f2191 DM |
609 | /* Device specific setup. */ |
610 | if (n->parms->neigh_setup && | |
611 | (error = n->parms->neigh_setup(n)) < 0) { | |
612 | rc = ERR_PTR(error); | |
613 | goto out_neigh_release; | |
614 | } | |
615 | ||
1f9248e5 | 616 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
617 | |
618 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
619 | nht = rcu_dereference_protected(tbl->nht, |
620 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 621 | |
cd089336 DM |
622 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
623 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 624 | |
096b9854 | 625 | hash_val = tbl->hash(n->primary_key, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
626 | |
627 | if (n->parms->dead) { | |
628 | rc = ERR_PTR(-EINVAL); | |
629 | goto out_tbl_unlock; | |
630 | } | |
631 | ||
767e97e1 ED |
632 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
633 | lockdep_is_held(&tbl->lock)); | |
634 | n1 != NULL; | |
635 | n1 = rcu_dereference_protected(n1->next, | |
636 | lockdep_is_held(&tbl->lock))) { | |
096b9854 | 637 | if (dev == n1->dev && !memcmp(n1->primary_key, n->primary_key, key_len)) { |
a263b309 DM |
638 | if (want_ref) |
639 | neigh_hold(n1); | |
1da177e4 LT |
640 | rc = n1; |
641 | goto out_tbl_unlock; | |
642 | } | |
643 | } | |
644 | ||
1da177e4 | 645 | n->dead = 0; |
e997f8a2 | 646 | if (!exempt_from_gc) |
8cc196d6 DA |
647 | list_add_tail(&n->gc_list, &n->tbl->gc_list); |
648 | ||
a263b309 DM |
649 | if (want_ref) |
650 | neigh_hold(n); | |
767e97e1 ED |
651 | rcu_assign_pointer(n->next, |
652 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
653 | lockdep_is_held(&tbl->lock))); | |
654 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 655 | write_unlock_bh(&tbl->lock); |
d5d427cd | 656 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
657 | rc = n; |
658 | out: | |
659 | return rc; | |
660 | out_tbl_unlock: | |
661 | write_unlock_bh(&tbl->lock); | |
662 | out_neigh_release: | |
64c6f4bb DA |
663 | if (!exempt_from_gc) |
664 | atomic_dec(&tbl->gc_entries); | |
1da177e4 LT |
665 | neigh_release(n); |
666 | goto out; | |
667 | } | |
58956317 DA |
668 | |
669 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
670 | struct net_device *dev, bool want_ref) | |
671 | { | |
672 | return ___neigh_create(tbl, pkey, dev, false, want_ref); | |
673 | } | |
a263b309 | 674 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 675 | |
01ccdf12 | 676 | static u32 pneigh_hash(const void *pkey, unsigned int key_len) |
fa86d322 | 677 | { |
fa86d322 | 678 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
679 | hash_val ^= (hash_val >> 16); |
680 | hash_val ^= hash_val >> 8; | |
681 | hash_val ^= hash_val >> 4; | |
682 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
683 | return hash_val; |
684 | } | |
fa86d322 | 685 | |
be01d655 YH |
686 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
687 | struct net *net, | |
688 | const void *pkey, | |
01ccdf12 | 689 | unsigned int key_len, |
be01d655 YH |
690 | struct net_device *dev) |
691 | { | |
692 | while (n) { | |
fa86d322 | 693 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 694 | net_eq(pneigh_net(n), net) && |
fa86d322 | 695 | (n->dev == dev || !n->dev)) |
be01d655 YH |
696 | return n; |
697 | n = n->next; | |
fa86d322 | 698 | } |
be01d655 YH |
699 | return NULL; |
700 | } | |
fa86d322 | 701 | |
be01d655 YH |
702 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
703 | struct net *net, const void *pkey, struct net_device *dev) | |
704 | { | |
01ccdf12 | 705 | unsigned int key_len = tbl->key_len; |
be01d655 YH |
706 | u32 hash_val = pneigh_hash(pkey, key_len); |
707 | ||
708 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
709 | net, pkey, key_len, dev); | |
fa86d322 | 710 | } |
0a204500 | 711 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 712 | |
426b5303 EB |
713 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
714 | struct net *net, const void *pkey, | |
1da177e4 LT |
715 | struct net_device *dev, int creat) |
716 | { | |
717 | struct pneigh_entry *n; | |
01ccdf12 | 718 | unsigned int key_len = tbl->key_len; |
be01d655 | 719 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
720 | |
721 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
722 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
723 | net, pkey, key_len, dev); | |
1da177e4 | 724 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
725 | |
726 | if (n || !creat) | |
1da177e4 LT |
727 | goto out; |
728 | ||
4ae28944 PE |
729 | ASSERT_RTNL(); |
730 | ||
1da177e4 LT |
731 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
732 | if (!n) | |
733 | goto out; | |
734 | ||
754d5da6 | 735 | n->protocol = 0; |
efd7ef1c | 736 | write_pnet(&n->net, net); |
1da177e4 LT |
737 | memcpy(n->key, pkey, key_len); |
738 | n->dev = dev; | |
739 | if (dev) | |
740 | dev_hold(dev); | |
741 | ||
742 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
743 | if (dev) | |
744 | dev_put(dev); | |
745 | kfree(n); | |
746 | n = NULL; | |
747 | goto out; | |
748 | } | |
749 | ||
750 | write_lock_bh(&tbl->lock); | |
751 | n->next = tbl->phash_buckets[hash_val]; | |
752 | tbl->phash_buckets[hash_val] = n; | |
753 | write_unlock_bh(&tbl->lock); | |
754 | out: | |
755 | return n; | |
756 | } | |
0a204500 | 757 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
758 | |
759 | ||
426b5303 | 760 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
761 | struct net_device *dev) |
762 | { | |
763 | struct pneigh_entry *n, **np; | |
01ccdf12 | 764 | unsigned int key_len = tbl->key_len; |
be01d655 | 765 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
766 | |
767 | write_lock_bh(&tbl->lock); | |
768 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
769 | np = &n->next) { | |
426b5303 | 770 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 771 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
772 | *np = n->next; |
773 | write_unlock_bh(&tbl->lock); | |
774 | if (tbl->pdestructor) | |
775 | tbl->pdestructor(n); | |
776 | if (n->dev) | |
777 | dev_put(n->dev); | |
778 | kfree(n); | |
779 | return 0; | |
780 | } | |
781 | } | |
782 | write_unlock_bh(&tbl->lock); | |
783 | return -ENOENT; | |
784 | } | |
785 | ||
53b76cdf WB |
786 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
787 | struct net_device *dev) | |
1da177e4 | 788 | { |
53b76cdf | 789 | struct pneigh_entry *n, **np, *freelist = NULL; |
1da177e4 LT |
790 | u32 h; |
791 | ||
792 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
793 | np = &tbl->phash_buckets[h]; | |
794 | while ((n = *np) != NULL) { | |
795 | if (!dev || n->dev == dev) { | |
796 | *np = n->next; | |
53b76cdf WB |
797 | n->next = freelist; |
798 | freelist = n; | |
1da177e4 LT |
799 | continue; |
800 | } | |
801 | np = &n->next; | |
802 | } | |
803 | } | |
53b76cdf WB |
804 | write_unlock_bh(&tbl->lock); |
805 | while ((n = freelist)) { | |
806 | freelist = n->next; | |
807 | n->next = NULL; | |
808 | if (tbl->pdestructor) | |
809 | tbl->pdestructor(n); | |
810 | if (n->dev) | |
811 | dev_put(n->dev); | |
812 | kfree(n); | |
813 | } | |
1da177e4 LT |
814 | return -ENOENT; |
815 | } | |
816 | ||
06f0511d DL |
817 | static void neigh_parms_destroy(struct neigh_parms *parms); |
818 | ||
819 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
820 | { | |
6343944b | 821 | if (refcount_dec_and_test(&parms->refcnt)) |
06f0511d DL |
822 | neigh_parms_destroy(parms); |
823 | } | |
1da177e4 LT |
824 | |
825 | /* | |
826 | * neighbour must already be out of the table; | |
827 | * | |
828 | */ | |
829 | void neigh_destroy(struct neighbour *neigh) | |
830 | { | |
da6a8fa0 DM |
831 | struct net_device *dev = neigh->dev; |
832 | ||
1da177e4 LT |
833 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
834 | ||
835 | if (!neigh->dead) { | |
e005d193 | 836 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
837 | dump_stack(); |
838 | return; | |
839 | } | |
840 | ||
841 | if (neigh_del_timer(neigh)) | |
e005d193 | 842 | pr_warn("Impossible event\n"); |
1da177e4 | 843 | |
c9ab4d85 ED |
844 | write_lock_bh(&neigh->lock); |
845 | __skb_queue_purge(&neigh->arp_queue); | |
846 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 847 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 848 | |
447f2191 | 849 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 850 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 851 | |
da6a8fa0 | 852 | dev_put(dev); |
1da177e4 LT |
853 | neigh_parms_put(neigh->parms); |
854 | ||
d5d427cd | 855 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
856 | |
857 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 858 | kfree_rcu(neigh, rcu); |
1da177e4 | 859 | } |
0a204500 | 860 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
861 | |
862 | /* Neighbour state is suspicious; | |
863 | disable fast path. | |
864 | ||
865 | Called with write_locked neigh. | |
866 | */ | |
867 | static void neigh_suspect(struct neighbour *neigh) | |
868 | { | |
d5d427cd | 869 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
870 | |
871 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
872 | } |
873 | ||
874 | /* Neighbour state is OK; | |
875 | enable fast path. | |
876 | ||
877 | Called with write_locked neigh. | |
878 | */ | |
879 | static void neigh_connect(struct neighbour *neigh) | |
880 | { | |
d5d427cd | 881 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
882 | |
883 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
884 | } |
885 | ||
e4c4e448 | 886 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 887 | { |
e4c4e448 | 888 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
889 | struct neighbour *n; |
890 | struct neighbour __rcu **np; | |
e4c4e448 | 891 | unsigned int i; |
d6bf7817 | 892 | struct neigh_hash_table *nht; |
1da177e4 LT |
893 | |
894 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
895 | ||
e4c4e448 | 896 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
897 | nht = rcu_dereference_protected(tbl->nht, |
898 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
899 | |
900 | /* | |
901 | * periodically recompute ReachableTime from random function | |
902 | */ | |
903 | ||
e4c4e448 | 904 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 905 | struct neigh_parms *p; |
e4c4e448 | 906 | tbl->last_rand = jiffies; |
75fbfd33 | 907 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 908 | p->reachable_time = |
1f9248e5 | 909 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
910 | } |
911 | ||
feff9ab2 DJ |
912 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
913 | goto out; | |
914 | ||
cd089336 | 915 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 916 | np = &nht->hash_buckets[i]; |
1da177e4 | 917 | |
767e97e1 ED |
918 | while ((n = rcu_dereference_protected(*np, |
919 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 920 | unsigned int state; |
1da177e4 | 921 | |
e4c4e448 | 922 | write_lock(&n->lock); |
1da177e4 | 923 | |
e4c4e448 | 924 | state = n->nud_state; |
9ce33e46 RP |
925 | if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) || |
926 | (n->flags & NTF_EXT_LEARNED)) { | |
e4c4e448 ED |
927 | write_unlock(&n->lock); |
928 | goto next_elt; | |
929 | } | |
1da177e4 | 930 | |
e4c4e448 ED |
931 | if (time_before(n->used, n->confirmed)) |
932 | n->used = n->confirmed; | |
1da177e4 | 933 | |
9f237430 | 934 | if (refcount_read(&n->refcnt) == 1 && |
e4c4e448 | 935 | (state == NUD_FAILED || |
1f9248e5 | 936 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 | 937 | *np = n->next; |
58956317 | 938 | neigh_mark_dead(n); |
e4c4e448 ED |
939 | write_unlock(&n->lock); |
940 | neigh_cleanup_and_release(n); | |
941 | continue; | |
942 | } | |
1da177e4 | 943 | write_unlock(&n->lock); |
1da177e4 LT |
944 | |
945 | next_elt: | |
e4c4e448 ED |
946 | np = &n->next; |
947 | } | |
948 | /* | |
949 | * It's fine to release lock here, even if hash table | |
950 | * grows while we are preempted. | |
951 | */ | |
952 | write_unlock_bh(&tbl->lock); | |
953 | cond_resched(); | |
954 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
955 | nht = rcu_dereference_protected(tbl->nht, |
956 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 957 | } |
2724680b | 958 | out: |
1f9248e5 JP |
959 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
960 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
961 | * BASE_REACHABLE_TIME. | |
1da177e4 | 962 | */ |
f618002b | 963 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 964 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 965 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
966 | } |
967 | ||
968 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
969 | { | |
970 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
971 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
972 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
973 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
974 | } |
975 | ||
5ef12d98 | 976 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
977 | __releases(neigh->lock) |
978 | __acquires(neigh->lock) | |
5ef12d98 TT |
979 | { |
980 | struct sk_buff *skb; | |
981 | ||
982 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 983 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
984 | neigh->updated = jiffies; |
985 | ||
986 | /* It is very thin place. report_unreachable is very complicated | |
987 | routine. Particularly, it can hit the same neighbour entry! | |
988 | ||
989 | So that, we try to be accurate and avoid dead loop. --ANK | |
990 | */ | |
991 | while (neigh->nud_state == NUD_FAILED && | |
992 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
993 | write_unlock(&neigh->lock); | |
994 | neigh->ops->error_report(neigh, skb); | |
995 | write_lock(&neigh->lock); | |
996 | } | |
c9ab4d85 | 997 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 998 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
999 | } |
1000 | ||
cd28ca0a ED |
1001 | static void neigh_probe(struct neighbour *neigh) |
1002 | __releases(neigh->lock) | |
1003 | { | |
4ed377e3 | 1004 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
1005 | /* keep skb alive even if arp_queue overflows */ |
1006 | if (skb) | |
19125c1a | 1007 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a | 1008 | write_unlock(&neigh->lock); |
48481c8f ED |
1009 | if (neigh->ops->solicit) |
1010 | neigh->ops->solicit(neigh, skb); | |
cd28ca0a | 1011 | atomic_inc(&neigh->probes); |
87fff3ca | 1012 | consume_skb(skb); |
cd28ca0a ED |
1013 | } |
1014 | ||
1da177e4 LT |
1015 | /* Called when a timer expires for a neighbour entry. */ |
1016 | ||
e99e88a9 | 1017 | static void neigh_timer_handler(struct timer_list *t) |
1da177e4 LT |
1018 | { |
1019 | unsigned long now, next; | |
e99e88a9 | 1020 | struct neighbour *neigh = from_timer(neigh, t, timer); |
95c96174 | 1021 | unsigned int state; |
1da177e4 LT |
1022 | int notify = 0; |
1023 | ||
1024 | write_lock(&neigh->lock); | |
1025 | ||
1026 | state = neigh->nud_state; | |
1027 | now = jiffies; | |
1028 | next = now + HZ; | |
1029 | ||
045f7b3b | 1030 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 1031 | goto out; |
1da177e4 LT |
1032 | |
1033 | if (state & NUD_REACHABLE) { | |
4ec93edb | 1034 | if (time_before_eq(now, |
1da177e4 | 1035 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 1036 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
1037 | next = neigh->confirmed + neigh->parms->reachable_time; |
1038 | } else if (time_before_eq(now, | |
1f9248e5 JP |
1039 | neigh->used + |
1040 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1041 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 1042 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1043 | neigh->updated = jiffies; |
1da177e4 | 1044 | neigh_suspect(neigh); |
1f9248e5 | 1045 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 1046 | } else { |
d5d427cd | 1047 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 1048 | neigh->nud_state = NUD_STALE; |
955aaa2f | 1049 | neigh->updated = jiffies; |
1da177e4 | 1050 | neigh_suspect(neigh); |
8d71740c | 1051 | notify = 1; |
1da177e4 LT |
1052 | } |
1053 | } else if (state & NUD_DELAY) { | |
4ec93edb | 1054 | if (time_before_eq(now, |
1f9248e5 JP |
1055 | neigh->confirmed + |
1056 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1057 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 1058 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 1059 | neigh->updated = jiffies; |
1da177e4 | 1060 | neigh_connect(neigh); |
8d71740c | 1061 | notify = 1; |
1da177e4 LT |
1062 | next = neigh->confirmed + neigh->parms->reachable_time; |
1063 | } else { | |
d5d427cd | 1064 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 1065 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 1066 | neigh->updated = jiffies; |
1da177e4 | 1067 | atomic_set(&neigh->probes, 0); |
765c9c63 | 1068 | notify = 1; |
19e16d22 HL |
1069 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1070 | HZ/100); | |
1da177e4 LT |
1071 | } |
1072 | } else { | |
1073 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
19e16d22 | 1074 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), HZ/100); |
1da177e4 LT |
1075 | } |
1076 | ||
1077 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
1078 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
1079 | neigh->nud_state = NUD_FAILED; |
1080 | notify = 1; | |
5ef12d98 | 1081 | neigh_invalidate(neigh); |
5e2c21dc | 1082 | goto out; |
1da177e4 LT |
1083 | } |
1084 | ||
1085 | if (neigh->nud_state & NUD_IN_TIMER) { | |
96d10d5b HL |
1086 | if (time_before(next, jiffies + HZ/100)) |
1087 | next = jiffies + HZ/100; | |
6fb9974f HX |
1088 | if (!mod_timer(&neigh->timer, next)) |
1089 | neigh_hold(neigh); | |
1da177e4 LT |
1090 | } |
1091 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 1092 | neigh_probe(neigh); |
9ff56607 | 1093 | } else { |
69cc64d8 | 1094 | out: |
9ff56607 DM |
1095 | write_unlock(&neigh->lock); |
1096 | } | |
d961db35 | 1097 | |
8d71740c | 1098 | if (notify) |
7b8f7a40 | 1099 | neigh_update_notify(neigh, 0); |
1da177e4 | 1100 | |
56dd18a4 RP |
1101 | trace_neigh_timer_handler(neigh, 0); |
1102 | ||
1da177e4 LT |
1103 | neigh_release(neigh); |
1104 | } | |
1105 | ||
1106 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
1107 | { | |
1108 | int rc; | |
cd28ca0a | 1109 | bool immediate_probe = false; |
1da177e4 LT |
1110 | |
1111 | write_lock_bh(&neigh->lock); | |
1112 | ||
1113 | rc = 0; | |
1114 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
1115 | goto out_unlock_bh; | |
2c51a97f JA |
1116 | if (neigh->dead) |
1117 | goto out_dead; | |
1da177e4 | 1118 | |
1da177e4 | 1119 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
1120 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
1121 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
1122 | unsigned long next, now = jiffies; |
1123 | ||
1f9248e5 JP |
1124 | atomic_set(&neigh->probes, |
1125 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
071c3798 | 1126 | neigh_del_timer(neigh); |
1da177e4 | 1127 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 1128 | neigh->updated = now; |
1f9248e5 | 1129 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
19e16d22 | 1130 | HZ/100); |
cd28ca0a ED |
1131 | neigh_add_timer(neigh, next); |
1132 | immediate_probe = true; | |
1da177e4 LT |
1133 | } else { |
1134 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 1135 | neigh->updated = jiffies; |
1da177e4 LT |
1136 | write_unlock_bh(&neigh->lock); |
1137 | ||
f3fbbe0f | 1138 | kfree_skb(skb); |
1da177e4 LT |
1139 | return 1; |
1140 | } | |
1141 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 1142 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
071c3798 | 1143 | neigh_del_timer(neigh); |
1da177e4 | 1144 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1145 | neigh->updated = jiffies; |
1f9248e5 JP |
1146 | neigh_add_timer(neigh, jiffies + |
1147 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
1151 | if (skb) { | |
8b5c171b | 1152 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1153 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1154 | struct sk_buff *buff; |
8b5c171b | 1155 | |
f72051b0 | 1156 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1157 | if (!buff) |
1158 | break; | |
1159 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1160 | kfree_skb(buff); |
9a6d276e | 1161 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1162 | } |
a4731138 | 1163 | skb_dst_force(skb); |
1da177e4 | 1164 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1165 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1166 | } |
1167 | rc = 1; | |
1168 | } | |
1169 | out_unlock_bh: | |
cd28ca0a ED |
1170 | if (immediate_probe) |
1171 | neigh_probe(neigh); | |
1172 | else | |
1173 | write_unlock(&neigh->lock); | |
1174 | local_bh_enable(); | |
56dd18a4 | 1175 | trace_neigh_event_send_done(neigh, rc); |
1da177e4 | 1176 | return rc; |
2c51a97f JA |
1177 | |
1178 | out_dead: | |
1179 | if (neigh->nud_state & NUD_STALE) | |
1180 | goto out_unlock_bh; | |
1181 | write_unlock_bh(&neigh->lock); | |
1182 | kfree_skb(skb); | |
56dd18a4 | 1183 | trace_neigh_event_send_dead(neigh, 1); |
2c51a97f | 1184 | return 1; |
1da177e4 | 1185 | } |
0a204500 | 1186 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1187 | |
f6b72b62 | 1188 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1189 | { |
1190 | struct hh_cache *hh; | |
3b04ddde | 1191 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1192 | = NULL; |
1193 | ||
1194 | if (neigh->dev->header_ops) | |
1195 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1196 | |
1197 | if (update) { | |
f6b72b62 | 1198 | hh = &neigh->hh; |
c305c6ae | 1199 | if (READ_ONCE(hh->hh_len)) { |
3644f0ce | 1200 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1201 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1202 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1203 | } |
1204 | } | |
1205 | } | |
1206 | ||
1207 | ||
1208 | ||
1209 | /* Generic update routine. | |
1210 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1211 | -- new is new state. | |
1212 | -- flags | |
1213 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1214 | if it is different. | |
1215 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1216 | lladdr instead of overriding it |
1da177e4 | 1217 | if it is different. |
1da177e4 LT |
1218 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
1219 | ||
4ec93edb | 1220 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1221 | NTF_ROUTER flag. |
1222 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1223 | a router. | |
1224 | ||
1225 | Caller MUST hold reference count on the entry. | |
1226 | */ | |
1227 | ||
7a35a50d DA |
1228 | static int __neigh_update(struct neighbour *neigh, const u8 *lladdr, |
1229 | u8 new, u32 flags, u32 nlmsg_pid, | |
1230 | struct netlink_ext_ack *extack) | |
1da177e4 | 1231 | { |
e997f8a2 | 1232 | bool ext_learn_change = false; |
1da177e4 LT |
1233 | u8 old; |
1234 | int err; | |
1da177e4 | 1235 | int notify = 0; |
1da177e4 LT |
1236 | struct net_device *dev; |
1237 | int update_isrouter = 0; | |
1238 | ||
56dd18a4 RP |
1239 | trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid); |
1240 | ||
1da177e4 LT |
1241 | write_lock_bh(&neigh->lock); |
1242 | ||
1243 | dev = neigh->dev; | |
1244 | old = neigh->nud_state; | |
1245 | err = -EPERM; | |
1246 | ||
7a35a50d DA |
1247 | if (neigh->dead) { |
1248 | NL_SET_ERR_MSG(extack, "Neighbor entry is now dead"); | |
eb4e8fac | 1249 | new = old; |
2c51a97f | 1250 | goto out; |
7a35a50d | 1251 | } |
eb4e8fac CA |
1252 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1253 | (old & (NUD_NOARP | NUD_PERMANENT))) | |
1254 | goto out; | |
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 | 1432 | neigh_add_timer(neigh, |
19e16d22 HL |
1433 | jiffies + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1434 | HZ/100)); | |
7e980569 JB |
1435 | } |
1436 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1437 | ||
1da177e4 LT |
1438 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1439 | u8 *lladdr, void *saddr, | |
1440 | struct net_device *dev) | |
1441 | { | |
1442 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1443 | lladdr || !dev->addr_len); | |
1444 | if (neigh) | |
4ec93edb | 1445 | neigh_update(neigh, lladdr, NUD_STALE, |
7b8f7a40 | 1446 | NEIGH_UPDATE_F_OVERRIDE, 0); |
1da177e4 LT |
1447 | return neigh; |
1448 | } | |
0a204500 | 1449 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1450 | |
34d101dd | 1451 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1452 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1453 | { |
bdf53c58 EB |
1454 | struct net_device *dev = n->dev; |
1455 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1456 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1457 | |
1458 | write_lock_bh(&n->lock); | |
34d101dd | 1459 | |
f6b72b62 DM |
1460 | /* Only one thread can come in here and initialize the |
1461 | * hh_cache entry. | |
1462 | */ | |
b23b5455 DM |
1463 | if (!hh->hh_len) |
1464 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1465 | |
0ed8ddf4 | 1466 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1467 | } |
1468 | ||
1da177e4 LT |
1469 | /* Slow and careful. */ |
1470 | ||
8f40b161 | 1471 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1472 | { |
1da177e4 LT |
1473 | int rc = 0; |
1474 | ||
1da177e4 LT |
1475 | if (!neigh_event_send(neigh, skb)) { |
1476 | int err; | |
1477 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1478 | unsigned int seq; |
34d101dd | 1479 | |
c305c6ae | 1480 | if (dev->header_ops->cache && !READ_ONCE(neigh->hh.hh_len)) |
bdf53c58 | 1481 | neigh_hh_init(neigh); |
34d101dd | 1482 | |
0ed8ddf4 | 1483 | do { |
e1f16503 | 1484 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1485 | seq = read_seqbegin(&neigh->ha_lock); |
1486 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1487 | neigh->ha, NULL, skb->len); | |
1488 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1489 | |
1da177e4 | 1490 | if (err >= 0) |
542d4d68 | 1491 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1492 | else |
1493 | goto out_kfree_skb; | |
1494 | } | |
1495 | out: | |
1496 | return rc; | |
1da177e4 LT |
1497 | out_kfree_skb: |
1498 | rc = -EINVAL; | |
1499 | kfree_skb(skb); | |
1500 | goto out; | |
1501 | } | |
0a204500 | 1502 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1503 | |
1504 | /* As fast as possible without hh cache */ | |
1505 | ||
8f40b161 | 1506 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1507 | { |
1da177e4 | 1508 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1509 | unsigned int seq; |
8f40b161 | 1510 | int err; |
1da177e4 | 1511 | |
0ed8ddf4 | 1512 | do { |
e1f16503 | 1513 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1514 | seq = read_seqbegin(&neigh->ha_lock); |
1515 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1516 | neigh->ha, NULL, skb->len); | |
1517 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1518 | ||
1da177e4 | 1519 | if (err >= 0) |
542d4d68 | 1520 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1521 | else { |
1522 | err = -EINVAL; | |
1523 | kfree_skb(skb); | |
1524 | } | |
1525 | return err; | |
1526 | } | |
0a204500 | 1527 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1528 | |
8f40b161 DM |
1529 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1530 | { | |
1531 | return dev_queue_xmit(skb); | |
1532 | } | |
1533 | EXPORT_SYMBOL(neigh_direct_output); | |
1534 | ||
e99e88a9 | 1535 | static void neigh_proxy_process(struct timer_list *t) |
1da177e4 | 1536 | { |
e99e88a9 | 1537 | struct neigh_table *tbl = from_timer(tbl, t, proxy_timer); |
1da177e4 LT |
1538 | long sched_next = 0; |
1539 | unsigned long now = jiffies; | |
f72051b0 | 1540 | struct sk_buff *skb, *n; |
1da177e4 LT |
1541 | |
1542 | spin_lock(&tbl->proxy_queue.lock); | |
1543 | ||
f72051b0 DM |
1544 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1545 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1546 | |
1da177e4 | 1547 | if (tdif <= 0) { |
f72051b0 | 1548 | struct net_device *dev = skb->dev; |
20e6074e | 1549 | |
f72051b0 | 1550 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1551 | if (tbl->proxy_redo && netif_running(dev)) { |
1552 | rcu_read_lock(); | |
f72051b0 | 1553 | tbl->proxy_redo(skb); |
20e6074e ED |
1554 | rcu_read_unlock(); |
1555 | } else { | |
f72051b0 | 1556 | kfree_skb(skb); |
20e6074e | 1557 | } |
1da177e4 LT |
1558 | |
1559 | dev_put(dev); | |
1560 | } else if (!sched_next || tdif < sched_next) | |
1561 | sched_next = tdif; | |
1562 | } | |
1563 | del_timer(&tbl->proxy_timer); | |
1564 | if (sched_next) | |
1565 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1566 | spin_unlock(&tbl->proxy_queue.lock); | |
1567 | } | |
1568 | ||
1569 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1570 | struct sk_buff *skb) | |
1571 | { | |
a533b70a | 1572 | unsigned long sched_next = jiffies + |
1573 | prandom_u32_max(NEIGH_VAR(p, PROXY_DELAY)); | |
1da177e4 | 1574 | |
1f9248e5 | 1575 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1576 | kfree_skb(skb); |
1577 | return; | |
1578 | } | |
a61bbcf2 PM |
1579 | |
1580 | NEIGH_CB(skb)->sched_next = sched_next; | |
1581 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1582 | |
1583 | spin_lock(&tbl->proxy_queue.lock); | |
1584 | if (del_timer(&tbl->proxy_timer)) { | |
1585 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1586 | sched_next = tbl->proxy_timer.expires; | |
1587 | } | |
adf30907 | 1588 | skb_dst_drop(skb); |
1da177e4 LT |
1589 | dev_hold(skb->dev); |
1590 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1591 | mod_timer(&tbl->proxy_timer, sched_next); | |
1592 | spin_unlock(&tbl->proxy_queue.lock); | |
1593 | } | |
0a204500 | 1594 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1595 | |
97fd5bc7 | 1596 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1597 | struct net *net, int ifindex) |
1598 | { | |
1599 | struct neigh_parms *p; | |
1600 | ||
75fbfd33 | 1601 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1602 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1603 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1604 | return p; |
1605 | } | |
1606 | ||
1607 | return NULL; | |
1608 | } | |
1da177e4 LT |
1609 | |
1610 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1611 | struct neigh_table *tbl) | |
1612 | { | |
cf89d6b2 | 1613 | struct neigh_parms *p; |
00829823 SH |
1614 | struct net *net = dev_net(dev); |
1615 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1616 | |
cf89d6b2 | 1617 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1618 | if (p) { |
1da177e4 | 1619 | p->tbl = tbl; |
6343944b | 1620 | refcount_set(&p->refcnt, 1); |
1da177e4 | 1621 | p->reachable_time = |
1f9248e5 | 1622 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1623 | dev_hold(dev); |
1624 | p->dev = dev; | |
efd7ef1c | 1625 | write_pnet(&p->net, net); |
63134803 | 1626 | p->sysctl_table = NULL; |
c7fb64db | 1627 | |
00829823 | 1628 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1629 | dev_put(dev); |
486b51d3 DL |
1630 | kfree(p); |
1631 | return NULL; | |
1da177e4 | 1632 | } |
486b51d3 | 1633 | |
1da177e4 | 1634 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1635 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1636 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1637 | |
1638 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1639 | } |
1640 | return p; | |
1641 | } | |
0a204500 | 1642 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1643 | |
1644 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1645 | { | |
1646 | struct neigh_parms *parms = | |
1647 | container_of(head, struct neigh_parms, rcu_head); | |
1648 | ||
1649 | neigh_parms_put(parms); | |
1650 | } | |
1651 | ||
1652 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1653 | { | |
1da177e4 LT |
1654 | if (!parms || parms == &tbl->parms) |
1655 | return; | |
1656 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1657 | list_del(&parms->list); |
1658 | parms->dead = 1; | |
1da177e4 | 1659 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1660 | if (parms->dev) |
1661 | dev_put(parms->dev); | |
1662 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1663 | } |
0a204500 | 1664 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1665 | |
06f0511d | 1666 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1667 | { |
1668 | kfree(parms); | |
1669 | } | |
1670 | ||
c2ecba71 PE |
1671 | static struct lock_class_key neigh_table_proxy_queue_class; |
1672 | ||
d7480fd3 WC |
1673 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1674 | ||
1675 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1676 | { |
1677 | unsigned long now = jiffies; | |
1678 | unsigned long phsize; | |
1679 | ||
75fbfd33 | 1680 | INIT_LIST_HEAD(&tbl->parms_list); |
58956317 | 1681 | INIT_LIST_HEAD(&tbl->gc_list); |
75fbfd33 | 1682 | list_add(&tbl->parms.list, &tbl->parms_list); |
e42ea986 | 1683 | write_pnet(&tbl->parms.net, &init_net); |
6343944b | 1684 | refcount_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1685 | tbl->parms.reachable_time = |
1f9248e5 | 1686 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1687 | |
1da177e4 LT |
1688 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1689 | if (!tbl->stats) | |
1690 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1691 | |
1da177e4 | 1692 | #ifdef CONFIG_PROC_FS |
71a5053a CH |
1693 | if (!proc_create_seq_data(tbl->id, 0, init_net.proc_net_stat, |
1694 | &neigh_stat_seq_ops, tbl)) | |
1da177e4 | 1695 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1696 | #endif |
1697 | ||
cd089336 | 1698 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1699 | |
1700 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1701 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1702 | |
d6bf7817 | 1703 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1704 | panic("cannot allocate neighbour cache hashes"); |
1705 | ||
08433eff YH |
1706 | if (!tbl->entry_size) |
1707 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1708 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1709 | else | |
1710 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1711 | ||
1da177e4 | 1712 | rwlock_init(&tbl->lock); |
203b42f7 | 1713 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1714 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1715 | tbl->parms.reachable_time); | |
e99e88a9 | 1716 | timer_setup(&tbl->proxy_timer, neigh_proxy_process, 0); |
c2ecba71 PE |
1717 | skb_queue_head_init_class(&tbl->proxy_queue, |
1718 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1719 | |
1720 | tbl->last_flush = now; | |
1721 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1722 | |
d7480fd3 | 1723 | neigh_tables[index] = tbl; |
1da177e4 | 1724 | } |
0a204500 | 1725 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1726 | |
d7480fd3 | 1727 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1728 | { |
d7480fd3 | 1729 | neigh_tables[index] = NULL; |
1da177e4 | 1730 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1731 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1732 | del_timer_sync(&tbl->proxy_timer); |
1733 | pneigh_queue_purge(&tbl->proxy_queue); | |
1734 | neigh_ifdown(tbl, NULL); | |
1735 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1736 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1737 | |
6193d2be ED |
1738 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1739 | neigh_hash_free_rcu); | |
d6bf7817 | 1740 | tbl->nht = NULL; |
1da177e4 LT |
1741 | |
1742 | kfree(tbl->phash_buckets); | |
1743 | tbl->phash_buckets = NULL; | |
1744 | ||
3f192b5c AD |
1745 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1746 | ||
3fcde74b KK |
1747 | free_percpu(tbl->stats); |
1748 | tbl->stats = NULL; | |
1749 | ||
1da177e4 LT |
1750 | return 0; |
1751 | } | |
0a204500 | 1752 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1753 | |
d7480fd3 WC |
1754 | static struct neigh_table *neigh_find_table(int family) |
1755 | { | |
1756 | struct neigh_table *tbl = NULL; | |
1757 | ||
1758 | switch (family) { | |
1759 | case AF_INET: | |
1760 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1761 | break; | |
1762 | case AF_INET6: | |
1763 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1764 | break; | |
1765 | case AF_DECnet: | |
1766 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1767 | break; | |
1768 | } | |
1769 | ||
1770 | return tbl; | |
1771 | } | |
1772 | ||
82cbb5c6 | 1773 | const struct nla_policy nda_policy[NDA_MAX+1] = { |
1274e1cc | 1774 | [NDA_UNSPEC] = { .strict_start_type = NDA_NH_ID }, |
82cbb5c6 RP |
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 }, |
1274e1cc | 1785 | [NDA_NH_ID] = { .type = NLA_U32 }, |
899426b3 | 1786 | [NDA_FDB_EXT_ATTRS] = { .type = NLA_NESTED }, |
82cbb5c6 RP |
1787 | }; |
1788 | ||
c21ef3e3 DA |
1789 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, |
1790 | struct netlink_ext_ack *extack) | |
1da177e4 | 1791 | { |
3b1e0a65 | 1792 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1793 | struct ndmsg *ndm; |
1794 | struct nlattr *dst_attr; | |
1da177e4 | 1795 | struct neigh_table *tbl; |
d7480fd3 | 1796 | struct neighbour *neigh; |
1da177e4 | 1797 | struct net_device *dev = NULL; |
a14a49d2 | 1798 | int err = -EINVAL; |
1da177e4 | 1799 | |
110b2499 | 1800 | ASSERT_RTNL(); |
a14a49d2 | 1801 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1802 | goto out; |
1803 | ||
a14a49d2 | 1804 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
7a35a50d DA |
1805 | if (!dst_attr) { |
1806 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
a14a49d2 | 1807 | goto out; |
7a35a50d | 1808 | } |
a14a49d2 TG |
1809 | |
1810 | ndm = nlmsg_data(nlh); | |
1811 | if (ndm->ndm_ifindex) { | |
110b2499 | 1812 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1813 | if (dev == NULL) { |
1814 | err = -ENODEV; | |
1815 | goto out; | |
1816 | } | |
1817 | } | |
1818 | ||
d7480fd3 WC |
1819 | tbl = neigh_find_table(ndm->ndm_family); |
1820 | if (tbl == NULL) | |
1821 | return -EAFNOSUPPORT; | |
1da177e4 | 1822 | |
7a35a50d DA |
1823 | if (nla_len(dst_attr) < (int)tbl->key_len) { |
1824 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1825 | goto out; |
7a35a50d | 1826 | } |
1da177e4 | 1827 | |
d7480fd3 WC |
1828 | if (ndm->ndm_flags & NTF_PROXY) { |
1829 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1830 | goto out; | |
1831 | } | |
1da177e4 | 1832 | |
d7480fd3 WC |
1833 | if (dev == NULL) |
1834 | goto out; | |
a14a49d2 | 1835 | |
d7480fd3 WC |
1836 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1837 | if (neigh == NULL) { | |
1838 | err = -ENOENT; | |
110b2499 | 1839 | goto out; |
1da177e4 | 1840 | } |
d7480fd3 | 1841 | |
7a35a50d DA |
1842 | err = __neigh_update(neigh, NULL, NUD_FAILED, |
1843 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, | |
1844 | NETLINK_CB(skb).portid, extack); | |
5071034e | 1845 | write_lock_bh(&tbl->lock); |
d7480fd3 | 1846 | neigh_release(neigh); |
5071034e SV |
1847 | neigh_remove_one(neigh, tbl); |
1848 | write_unlock_bh(&tbl->lock); | |
a14a49d2 | 1849 | |
1da177e4 LT |
1850 | out: |
1851 | return err; | |
1852 | } | |
1853 | ||
c21ef3e3 DA |
1854 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
1855 | struct netlink_ext_ack *extack) | |
1da177e4 | 1856 | { |
f7aa74e4 RP |
1857 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE | |
1858 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
3b1e0a65 | 1859 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1860 | struct ndmsg *ndm; |
1861 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1862 | struct neigh_table *tbl; |
1863 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1864 | struct neighbour *neigh; |
1865 | void *dst, *lladdr; | |
df9b0e30 | 1866 | u8 protocol = 0; |
5208debd | 1867 | int err; |
1da177e4 | 1868 | |
110b2499 | 1869 | ASSERT_RTNL(); |
8cb08174 JB |
1870 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, |
1871 | nda_policy, extack); | |
5208debd | 1872 | if (err < 0) |
1da177e4 LT |
1873 | goto out; |
1874 | ||
5208debd | 1875 | err = -EINVAL; |
7a35a50d DA |
1876 | if (!tb[NDA_DST]) { |
1877 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
5208debd | 1878 | goto out; |
7a35a50d | 1879 | } |
5208debd TG |
1880 | |
1881 | ndm = nlmsg_data(nlh); | |
1882 | if (ndm->ndm_ifindex) { | |
110b2499 | 1883 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1884 | if (dev == NULL) { |
1885 | err = -ENODEV; | |
1886 | goto out; | |
1887 | } | |
1888 | ||
7a35a50d DA |
1889 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) { |
1890 | NL_SET_ERR_MSG(extack, "Invalid link address"); | |
110b2499 | 1891 | goto out; |
7a35a50d | 1892 | } |
5208debd TG |
1893 | } |
1894 | ||
d7480fd3 WC |
1895 | tbl = neigh_find_table(ndm->ndm_family); |
1896 | if (tbl == NULL) | |
1897 | return -EAFNOSUPPORT; | |
1da177e4 | 1898 | |
7a35a50d DA |
1899 | if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) { |
1900 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1901 | goto out; |
7a35a50d DA |
1902 | } |
1903 | ||
d7480fd3 WC |
1904 | dst = nla_data(tb[NDA_DST]); |
1905 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1906 | |
a9cd3439 | 1907 | if (tb[NDA_PROTOCOL]) |
df9b0e30 | 1908 | protocol = nla_get_u8(tb[NDA_PROTOCOL]); |
df9b0e30 | 1909 | |
d7480fd3 WC |
1910 | if (ndm->ndm_flags & NTF_PROXY) { |
1911 | struct pneigh_entry *pn; | |
1912 | ||
1913 | err = -ENOBUFS; | |
1914 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1915 | if (pn) { | |
1916 | pn->flags = ndm->ndm_flags; | |
df9b0e30 DA |
1917 | if (protocol) |
1918 | pn->protocol = protocol; | |
d7480fd3 WC |
1919 | err = 0; |
1920 | } | |
1921 | goto out; | |
1922 | } | |
1da177e4 | 1923 | |
7a35a50d DA |
1924 | if (!dev) { |
1925 | NL_SET_ERR_MSG(extack, "Device not specified"); | |
d7480fd3 | 1926 | goto out; |
7a35a50d | 1927 | } |
62dd9318 | 1928 | |
b8fb1ab4 DA |
1929 | if (tbl->allow_add && !tbl->allow_add(dev, extack)) { |
1930 | err = -EINVAL; | |
1931 | goto out; | |
1932 | } | |
1933 | ||
d7480fd3 WC |
1934 | neigh = neigh_lookup(tbl, dst, dev); |
1935 | if (neigh == NULL) { | |
e997f8a2 DA |
1936 | bool exempt_from_gc; |
1937 | ||
d7480fd3 WC |
1938 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
1939 | err = -ENOENT; | |
110b2499 | 1940 | goto out; |
1da177e4 LT |
1941 | } |
1942 | ||
e997f8a2 DA |
1943 | exempt_from_gc = ndm->ndm_state & NUD_PERMANENT || |
1944 | ndm->ndm_flags & NTF_EXT_LEARNED; | |
1945 | neigh = ___neigh_create(tbl, dst, dev, exempt_from_gc, true); | |
d7480fd3 WC |
1946 | if (IS_ERR(neigh)) { |
1947 | err = PTR_ERR(neigh); | |
1948 | goto out; | |
1949 | } | |
1950 | } else { | |
1951 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1952 | err = -EEXIST; | |
1953 | neigh_release(neigh); | |
110b2499 | 1954 | goto out; |
5208debd | 1955 | } |
1da177e4 | 1956 | |
d7480fd3 | 1957 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
f7aa74e4 RP |
1958 | flags &= ~(NEIGH_UPDATE_F_OVERRIDE | |
1959 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1da177e4 LT |
1960 | } |
1961 | ||
38212bb3 RM |
1962 | if (protocol) |
1963 | neigh->protocol = protocol; | |
1964 | ||
9ce33e46 RP |
1965 | if (ndm->ndm_flags & NTF_EXT_LEARNED) |
1966 | flags |= NEIGH_UPDATE_F_EXT_LEARNED; | |
1967 | ||
f7aa74e4 RP |
1968 | if (ndm->ndm_flags & NTF_ROUTER) |
1969 | flags |= NEIGH_UPDATE_F_ISROUTER; | |
1970 | ||
d7480fd3 WC |
1971 | if (ndm->ndm_flags & NTF_USE) { |
1972 | neigh_event_send(neigh, NULL); | |
1973 | err = 0; | |
1974 | } else | |
7a35a50d DA |
1975 | err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags, |
1976 | NETLINK_CB(skb).portid, extack); | |
df9b0e30 | 1977 | |
d7480fd3 WC |
1978 | neigh_release(neigh); |
1979 | ||
1da177e4 LT |
1980 | out: |
1981 | return err; | |
1982 | } | |
1983 | ||
c7fb64db TG |
1984 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1985 | { | |
ca860fb3 TG |
1986 | struct nlattr *nest; |
1987 | ||
ae0be8de | 1988 | nest = nla_nest_start_noflag(skb, NDTA_PARMS); |
ca860fb3 TG |
1989 | if (nest == NULL) |
1990 | return -ENOBUFS; | |
c7fb64db | 1991 | |
9a6308d7 DM |
1992 | if ((parms->dev && |
1993 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
6343944b | 1994 | nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) || |
1f9248e5 JP |
1995 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1996 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1997 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1998 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1999 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
2000 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
2001 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
2002 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
2003 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
2004 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
2005 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
2006 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
2007 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
2008 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
2009 | NDTPA_PAD) || | |
9a6308d7 | 2010 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 2011 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 2012 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 2013 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 2014 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 2015 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 2016 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 2017 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 2018 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 2019 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 2020 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 2021 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 2022 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
2175d87c | 2023 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD)) |
9a6308d7 | 2024 | goto nla_put_failure; |
ca860fb3 | 2025 | return nla_nest_end(skb, nest); |
c7fb64db | 2026 | |
ca860fb3 | 2027 | nla_put_failure: |
bc3ed28c TG |
2028 | nla_nest_cancel(skb, nest); |
2029 | return -EMSGSIZE; | |
c7fb64db TG |
2030 | } |
2031 | ||
ca860fb3 TG |
2032 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
2033 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
2034 | { |
2035 | struct nlmsghdr *nlh; | |
2036 | struct ndtmsg *ndtmsg; | |
2037 | ||
ca860fb3 TG |
2038 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2039 | if (nlh == NULL) | |
26932566 | 2040 | return -EMSGSIZE; |
c7fb64db | 2041 | |
ca860fb3 | 2042 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2043 | |
2044 | read_lock_bh(&tbl->lock); | |
2045 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2046 | ndtmsg->ndtm_pad1 = 0; |
2047 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2048 | |
9a6308d7 | 2049 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 2050 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
2051 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
2052 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
2053 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
2054 | goto nla_put_failure; | |
c7fb64db TG |
2055 | { |
2056 | unsigned long now = jiffies; | |
9d027e3a ED |
2057 | long flush_delta = now - tbl->last_flush; |
2058 | long rand_delta = now - tbl->last_rand; | |
d6bf7817 | 2059 | struct neigh_hash_table *nht; |
c7fb64db TG |
2060 | struct ndt_config ndc = { |
2061 | .ndtc_key_len = tbl->key_len, | |
2062 | .ndtc_entry_size = tbl->entry_size, | |
2063 | .ndtc_entries = atomic_read(&tbl->entries), | |
2064 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
2065 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
2066 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
2067 | }; | |
2068 | ||
d6bf7817 ED |
2069 | rcu_read_lock_bh(); |
2070 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 2071 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 2072 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
2073 | rcu_read_unlock_bh(); |
2074 | ||
9a6308d7 DM |
2075 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
2076 | goto nla_put_failure; | |
c7fb64db TG |
2077 | } |
2078 | ||
2079 | { | |
2080 | int cpu; | |
2081 | struct ndt_stats ndst; | |
2082 | ||
2083 | memset(&ndst, 0, sizeof(ndst)); | |
2084 | ||
6f912042 | 2085 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
2086 | struct neigh_statistics *st; |
2087 | ||
c7fb64db TG |
2088 | st = per_cpu_ptr(tbl->stats, cpu); |
2089 | ndst.ndts_allocs += st->allocs; | |
2090 | ndst.ndts_destroys += st->destroys; | |
2091 | ndst.ndts_hash_grows += st->hash_grows; | |
2092 | ndst.ndts_res_failed += st->res_failed; | |
2093 | ndst.ndts_lookups += st->lookups; | |
2094 | ndst.ndts_hits += st->hits; | |
2095 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
2096 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
2097 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
2098 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 2099 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
2100 | } |
2101 | ||
b676338f ND |
2102 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
2103 | NDTA_PAD)) | |
9a6308d7 | 2104 | goto nla_put_failure; |
c7fb64db TG |
2105 | } |
2106 | ||
2107 | BUG_ON(tbl->parms.dev); | |
2108 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 2109 | goto nla_put_failure; |
c7fb64db TG |
2110 | |
2111 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2112 | nlmsg_end(skb, nlh); |
2113 | return 0; | |
c7fb64db | 2114 | |
ca860fb3 | 2115 | nla_put_failure: |
c7fb64db | 2116 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2117 | nlmsg_cancel(skb, nlh); |
2118 | return -EMSGSIZE; | |
c7fb64db TG |
2119 | } |
2120 | ||
ca860fb3 TG |
2121 | static int neightbl_fill_param_info(struct sk_buff *skb, |
2122 | struct neigh_table *tbl, | |
c7fb64db | 2123 | struct neigh_parms *parms, |
ca860fb3 TG |
2124 | u32 pid, u32 seq, int type, |
2125 | unsigned int flags) | |
c7fb64db TG |
2126 | { |
2127 | struct ndtmsg *ndtmsg; | |
2128 | struct nlmsghdr *nlh; | |
2129 | ||
ca860fb3 TG |
2130 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2131 | if (nlh == NULL) | |
26932566 | 2132 | return -EMSGSIZE; |
c7fb64db | 2133 | |
ca860fb3 | 2134 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2135 | |
2136 | read_lock_bh(&tbl->lock); | |
2137 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2138 | ndtmsg->ndtm_pad1 = 0; |
2139 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2140 | |
ca860fb3 TG |
2141 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
2142 | neightbl_fill_parms(skb, parms) < 0) | |
2143 | goto errout; | |
c7fb64db TG |
2144 | |
2145 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2146 | nlmsg_end(skb, nlh); |
2147 | return 0; | |
ca860fb3 | 2148 | errout: |
c7fb64db | 2149 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2150 | nlmsg_cancel(skb, nlh); |
2151 | return -EMSGSIZE; | |
c7fb64db | 2152 | } |
4ec93edb | 2153 | |
ef7c79ed | 2154 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
2155 | [NDTA_NAME] = { .type = NLA_STRING }, |
2156 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
2157 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
2158 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
2159 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
2160 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
2161 | }; | |
2162 | ||
ef7c79ed | 2163 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
2164 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
2165 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
2166 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
2167 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
2168 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
2169 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 2170 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
2171 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
2172 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
2173 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
2174 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
2175 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
2176 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
2177 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
2178 | }; | |
2179 | ||
c21ef3e3 DA |
2180 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, |
2181 | struct netlink_ext_ack *extack) | |
c7fb64db | 2182 | { |
3b1e0a65 | 2183 | struct net *net = sock_net(skb->sk); |
c7fb64db | 2184 | struct neigh_table *tbl; |
6b3f8674 TG |
2185 | struct ndtmsg *ndtmsg; |
2186 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
2187 | bool found = false; |
2188 | int err, tidx; | |
c7fb64db | 2189 | |
8cb08174 JB |
2190 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
2191 | nl_neightbl_policy, extack); | |
6b3f8674 TG |
2192 | if (err < 0) |
2193 | goto errout; | |
c7fb64db | 2194 | |
6b3f8674 TG |
2195 | if (tb[NDTA_NAME] == NULL) { |
2196 | err = -EINVAL; | |
2197 | goto errout; | |
2198 | } | |
2199 | ||
2200 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
2201 | |
2202 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
2203 | tbl = neigh_tables[tidx]; | |
2204 | if (!tbl) | |
2205 | continue; | |
c7fb64db TG |
2206 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
2207 | continue; | |
d7480fd3 WC |
2208 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
2209 | found = true; | |
c7fb64db | 2210 | break; |
d7480fd3 | 2211 | } |
c7fb64db TG |
2212 | } |
2213 | ||
d7480fd3 WC |
2214 | if (!found) |
2215 | return -ENOENT; | |
c7fb64db | 2216 | |
4ec93edb | 2217 | /* |
c7fb64db TG |
2218 | * We acquire tbl->lock to be nice to the periodic timers and |
2219 | * make sure they always see a consistent set of values. | |
2220 | */ | |
2221 | write_lock_bh(&tbl->lock); | |
2222 | ||
6b3f8674 TG |
2223 | if (tb[NDTA_PARMS]) { |
2224 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 2225 | struct neigh_parms *p; |
6b3f8674 | 2226 | int i, ifindex = 0; |
c7fb64db | 2227 | |
8cb08174 JB |
2228 | err = nla_parse_nested_deprecated(tbp, NDTPA_MAX, |
2229 | tb[NDTA_PARMS], | |
2230 | nl_ntbl_parm_policy, extack); | |
6b3f8674 TG |
2231 | if (err < 0) |
2232 | goto errout_tbl_lock; | |
c7fb64db | 2233 | |
6b3f8674 TG |
2234 | if (tbp[NDTPA_IFINDEX]) |
2235 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 2236 | |
97fd5bc7 | 2237 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
2238 | if (p == NULL) { |
2239 | err = -ENOENT; | |
6b3f8674 | 2240 | goto errout_tbl_lock; |
c7fb64db | 2241 | } |
c7fb64db | 2242 | |
6b3f8674 TG |
2243 | for (i = 1; i <= NDTPA_MAX; i++) { |
2244 | if (tbp[i] == NULL) | |
2245 | continue; | |
c7fb64db | 2246 | |
6b3f8674 TG |
2247 | switch (i) { |
2248 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2249 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2250 | nla_get_u32(tbp[i]) * | |
2251 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2252 | break; |
2253 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2254 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2255 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2256 | break; |
2257 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2258 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2259 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2260 | break; |
2261 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2262 | NEIGH_VAR_SET(p, APP_PROBES, |
2263 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2264 | break; |
2265 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2266 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2267 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2268 | break; |
2269 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2270 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2271 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2272 | break; |
8da86466 YH |
2273 | case NDTPA_MCAST_REPROBES: |
2274 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2275 | nla_get_u32(tbp[i])); | |
2276 | break; | |
6b3f8674 | 2277 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2278 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2279 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2280 | /* update reachable_time as well, otherwise, the change will |
2281 | * only be effective after the next time neigh_periodic_work | |
2282 | * decides to recompute it (can be multiple minutes) | |
2283 | */ | |
2284 | p->reachable_time = | |
2285 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2286 | break; |
2287 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2288 | NEIGH_VAR_SET(p, GC_STALETIME, |
2289 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2290 | break; |
2291 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2292 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2293 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2294 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 TG |
2295 | break; |
2296 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2297 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2298 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2299 | break; |
2300 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2301 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2302 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2303 | break; |
2304 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2305 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2306 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2307 | break; |
2308 | case NDTPA_LOCKTIME: | |
3977458c JP |
2309 | NEIGH_VAR_SET(p, LOCKTIME, |
2310 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2311 | break; |
2312 | } | |
2313 | } | |
2314 | } | |
c7fb64db | 2315 | |
dc25c676 G |
2316 | err = -ENOENT; |
2317 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2318 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2319 | !net_eq(net, &init_net)) | |
2320 | goto errout_tbl_lock; | |
2321 | ||
6b3f8674 TG |
2322 | if (tb[NDTA_THRESH1]) |
2323 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2324 | |
6b3f8674 TG |
2325 | if (tb[NDTA_THRESH2]) |
2326 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2327 | |
6b3f8674 TG |
2328 | if (tb[NDTA_THRESH3]) |
2329 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2330 | |
6b3f8674 TG |
2331 | if (tb[NDTA_GC_INTERVAL]) |
2332 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2333 | |
2334 | err = 0; | |
2335 | ||
6b3f8674 | 2336 | errout_tbl_lock: |
c7fb64db | 2337 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2338 | errout: |
c7fb64db TG |
2339 | return err; |
2340 | } | |
2341 | ||
9632d47f DA |
2342 | static int neightbl_valid_dump_info(const struct nlmsghdr *nlh, |
2343 | struct netlink_ext_ack *extack) | |
2344 | { | |
2345 | struct ndtmsg *ndtm; | |
2346 | ||
2347 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) { | |
2348 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request"); | |
2349 | return -EINVAL; | |
2350 | } | |
2351 | ||
2352 | ndtm = nlmsg_data(nlh); | |
2353 | if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) { | |
2354 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request"); | |
2355 | return -EINVAL; | |
2356 | } | |
2357 | ||
2358 | if (nlmsg_attrlen(nlh, sizeof(*ndtm))) { | |
2359 | NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request"); | |
2360 | return -EINVAL; | |
2361 | } | |
2362 | ||
2363 | return 0; | |
2364 | } | |
2365 | ||
c8822a4e | 2366 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2367 | { |
9632d47f | 2368 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 2369 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2370 | int family, tidx, nidx = 0; |
2371 | int tbl_skip = cb->args[0]; | |
2372 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2373 | struct neigh_table *tbl; |
2374 | ||
9632d47f DA |
2375 | if (cb->strict_check) { |
2376 | int err = neightbl_valid_dump_info(nlh, cb->extack); | |
2377 | ||
2378 | if (err < 0) | |
2379 | return err; | |
2380 | } | |
2381 | ||
2382 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; | |
c7fb64db | 2383 | |
d7480fd3 | 2384 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2385 | struct neigh_parms *p; |
2386 | ||
d7480fd3 WC |
2387 | tbl = neigh_tables[tidx]; |
2388 | if (!tbl) | |
2389 | continue; | |
2390 | ||
ca860fb3 | 2391 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2392 | continue; |
2393 | ||
15e47304 | 2394 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
9632d47f | 2395 | nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2396 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2397 | break; |
2398 | ||
75fbfd33 ND |
2399 | nidx = 0; |
2400 | p = list_next_entry(&tbl->parms, list); | |
2401 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2402 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2403 | continue; |
2404 | ||
efc683fc GK |
2405 | if (nidx < neigh_skip) |
2406 | goto next; | |
c7fb64db | 2407 | |
ca860fb3 | 2408 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2409 | NETLINK_CB(cb->skb).portid, |
9632d47f | 2410 | nlh->nlmsg_seq, |
ca860fb3 | 2411 | RTM_NEWNEIGHTBL, |
7b46a644 | 2412 | NLM_F_MULTI) < 0) |
c7fb64db | 2413 | goto out; |
efc683fc GK |
2414 | next: |
2415 | nidx++; | |
c7fb64db TG |
2416 | } |
2417 | ||
ca860fb3 | 2418 | neigh_skip = 0; |
c7fb64db TG |
2419 | } |
2420 | out: | |
ca860fb3 TG |
2421 | cb->args[0] = tidx; |
2422 | cb->args[1] = nidx; | |
c7fb64db TG |
2423 | |
2424 | return skb->len; | |
2425 | } | |
1da177e4 | 2426 | |
8b8aec50 TG |
2427 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2428 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2429 | { |
2430 | unsigned long now = jiffies; | |
1da177e4 | 2431 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2432 | struct nlmsghdr *nlh; |
2433 | struct ndmsg *ndm; | |
2434 | ||
2435 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2436 | if (nlh == NULL) | |
26932566 | 2437 | return -EMSGSIZE; |
1da177e4 | 2438 | |
8b8aec50 TG |
2439 | ndm = nlmsg_data(nlh); |
2440 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2441 | ndm->ndm_pad1 = 0; |
2442 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2443 | ndm->ndm_flags = neigh->flags; |
2444 | ndm->ndm_type = neigh->type; | |
2445 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2446 | |
9a6308d7 DM |
2447 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2448 | goto nla_put_failure; | |
8b8aec50 TG |
2449 | |
2450 | read_lock_bh(&neigh->lock); | |
2451 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2452 | if (neigh->nud_state & NUD_VALID) { |
2453 | char haddr[MAX_ADDR_LEN]; | |
2454 | ||
2455 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2456 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2457 | read_unlock_bh(&neigh->lock); | |
2458 | goto nla_put_failure; | |
2459 | } | |
8b8aec50 TG |
2460 | } |
2461 | ||
b9f5f52c SH |
2462 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2463 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2464 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
9f237430 | 2465 | ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1; |
8b8aec50 TG |
2466 | read_unlock_bh(&neigh->lock); |
2467 | ||
9a6308d7 DM |
2468 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2469 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2470 | goto nla_put_failure; | |
8b8aec50 | 2471 | |
df9b0e30 DA |
2472 | if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol)) |
2473 | goto nla_put_failure; | |
2474 | ||
053c095a JB |
2475 | nlmsg_end(skb, nlh); |
2476 | return 0; | |
8b8aec50 TG |
2477 | |
2478 | nla_put_failure: | |
26932566 PM |
2479 | nlmsg_cancel(skb, nlh); |
2480 | return -EMSGSIZE; | |
1da177e4 LT |
2481 | } |
2482 | ||
84920c14 TZ |
2483 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2484 | u32 pid, u32 seq, int type, unsigned int flags, | |
2485 | struct neigh_table *tbl) | |
2486 | { | |
2487 | struct nlmsghdr *nlh; | |
2488 | struct ndmsg *ndm; | |
2489 | ||
2490 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2491 | if (nlh == NULL) | |
2492 | return -EMSGSIZE; | |
2493 | ||
2494 | ndm = nlmsg_data(nlh); | |
2495 | ndm->ndm_family = tbl->family; | |
2496 | ndm->ndm_pad1 = 0; | |
2497 | ndm->ndm_pad2 = 0; | |
2498 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2499 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2500 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2501 | ndm->ndm_state = NUD_NONE; |
2502 | ||
9a6308d7 DM |
2503 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2504 | goto nla_put_failure; | |
84920c14 | 2505 | |
df9b0e30 DA |
2506 | if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol)) |
2507 | goto nla_put_failure; | |
2508 | ||
053c095a JB |
2509 | nlmsg_end(skb, nlh); |
2510 | return 0; | |
84920c14 TZ |
2511 | |
2512 | nla_put_failure: | |
2513 | nlmsg_cancel(skb, nlh); | |
2514 | return -EMSGSIZE; | |
2515 | } | |
2516 | ||
7b8f7a40 | 2517 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid) |
d961db35 TG |
2518 | { |
2519 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
7b8f7a40 | 2520 | __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid); |
d961db35 | 2521 | } |
1da177e4 | 2522 | |
21fdd092 DA |
2523 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2524 | { | |
2525 | struct net_device *master; | |
2526 | ||
2527 | if (!master_idx) | |
2528 | return false; | |
2529 | ||
aab456df | 2530 | master = dev ? netdev_master_upper_dev_get(dev) : NULL; |
21fdd092 DA |
2531 | if (!master || master->ifindex != master_idx) |
2532 | return true; | |
2533 | ||
2534 | return false; | |
2535 | } | |
2536 | ||
16660f0b DA |
2537 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2538 | { | |
aab456df | 2539 | if (filter_idx && (!dev || dev->ifindex != filter_idx)) |
16660f0b DA |
2540 | return true; |
2541 | ||
2542 | return false; | |
2543 | } | |
2544 | ||
6f52f80e DA |
2545 | struct neigh_dump_filter { |
2546 | int master_idx; | |
2547 | int dev_idx; | |
2548 | }; | |
2549 | ||
1da177e4 | 2550 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2551 | struct netlink_callback *cb, |
2552 | struct neigh_dump_filter *filter) | |
1da177e4 | 2553 | { |
767e97e1 | 2554 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2555 | struct neighbour *n; |
2556 | int rc, h, s_h = cb->args[1]; | |
2557 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2558 | struct neigh_hash_table *nht; |
21fdd092 | 2559 | unsigned int flags = NLM_F_MULTI; |
21fdd092 | 2560 | |
6f52f80e DA |
2561 | if (filter->dev_idx || filter->master_idx) |
2562 | flags |= NLM_F_DUMP_FILTERED; | |
1da177e4 | 2563 | |
d6bf7817 ED |
2564 | rcu_read_lock_bh(); |
2565 | nht = rcu_dereference_bh(tbl->nht); | |
2566 | ||
4bd6683b | 2567 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2568 | if (h > s_h) |
2569 | s_idx = 0; | |
767e97e1 ED |
2570 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2571 | n != NULL; | |
2572 | n = rcu_dereference_bh(n->next)) { | |
18502acd ZS |
2573 | if (idx < s_idx || !net_eq(dev_net(n->dev), net)) |
2574 | goto next; | |
6f52f80e DA |
2575 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2576 | neigh_master_filtered(n->dev, filter->master_idx)) | |
efc683fc | 2577 | goto next; |
15e47304 | 2578 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2579 | cb->nlh->nlmsg_seq, |
b6544c0b | 2580 | RTM_NEWNEIGH, |
21fdd092 | 2581 | flags) < 0) { |
1da177e4 LT |
2582 | rc = -1; |
2583 | goto out; | |
2584 | } | |
767e97e1 | 2585 | next: |
efc683fc | 2586 | idx++; |
1da177e4 | 2587 | } |
1da177e4 LT |
2588 | } |
2589 | rc = skb->len; | |
2590 | out: | |
d6bf7817 | 2591 | rcu_read_unlock_bh(); |
1da177e4 LT |
2592 | cb->args[1] = h; |
2593 | cb->args[2] = idx; | |
2594 | return rc; | |
2595 | } | |
2596 | ||
84920c14 | 2597 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2598 | struct netlink_callback *cb, |
2599 | struct neigh_dump_filter *filter) | |
84920c14 TZ |
2600 | { |
2601 | struct pneigh_entry *n; | |
2602 | struct net *net = sock_net(skb->sk); | |
2603 | int rc, h, s_h = cb->args[3]; | |
2604 | int idx, s_idx = idx = cb->args[4]; | |
6f52f80e DA |
2605 | unsigned int flags = NLM_F_MULTI; |
2606 | ||
2607 | if (filter->dev_idx || filter->master_idx) | |
2608 | flags |= NLM_F_DUMP_FILTERED; | |
84920c14 TZ |
2609 | |
2610 | read_lock_bh(&tbl->lock); | |
2611 | ||
4bd6683b | 2612 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2613 | if (h > s_h) |
2614 | s_idx = 0; | |
2615 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
18502acd | 2616 | if (idx < s_idx || pneigh_net(n) != net) |
84920c14 | 2617 | goto next; |
6f52f80e DA |
2618 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2619 | neigh_master_filtered(n->dev, filter->master_idx)) | |
2620 | goto next; | |
15e47304 | 2621 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 | 2622 | cb->nlh->nlmsg_seq, |
6f52f80e | 2623 | RTM_NEWNEIGH, flags, tbl) < 0) { |
84920c14 TZ |
2624 | read_unlock_bh(&tbl->lock); |
2625 | rc = -1; | |
2626 | goto out; | |
2627 | } | |
2628 | next: | |
2629 | idx++; | |
2630 | } | |
2631 | } | |
2632 | ||
2633 | read_unlock_bh(&tbl->lock); | |
2634 | rc = skb->len; | |
2635 | out: | |
2636 | cb->args[3] = h; | |
2637 | cb->args[4] = idx; | |
2638 | return rc; | |
2639 | ||
2640 | } | |
2641 | ||
51183d23 DA |
2642 | static int neigh_valid_dump_req(const struct nlmsghdr *nlh, |
2643 | bool strict_check, | |
2644 | struct neigh_dump_filter *filter, | |
2645 | struct netlink_ext_ack *extack) | |
2646 | { | |
2647 | struct nlattr *tb[NDA_MAX + 1]; | |
2648 | int err, i; | |
2649 | ||
2650 | if (strict_check) { | |
2651 | struct ndmsg *ndm; | |
2652 | ||
2653 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2654 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor dump request"); | |
2655 | return -EINVAL; | |
2656 | } | |
2657 | ||
2658 | ndm = nlmsg_data(nlh); | |
2659 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_ifindex || | |
c0fde870 | 2660 | ndm->ndm_state || ndm->ndm_type) { |
51183d23 DA |
2661 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor dump request"); |
2662 | return -EINVAL; | |
2663 | } | |
2664 | ||
c0fde870 DA |
2665 | if (ndm->ndm_flags & ~NTF_PROXY) { |
2666 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor dump request"); | |
2667 | return -EINVAL; | |
2668 | } | |
2669 | ||
8cb08174 JB |
2670 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), |
2671 | tb, NDA_MAX, nda_policy, | |
2672 | extack); | |
51183d23 | 2673 | } else { |
8cb08174 JB |
2674 | err = nlmsg_parse_deprecated(nlh, sizeof(struct ndmsg), tb, |
2675 | NDA_MAX, nda_policy, extack); | |
51183d23 DA |
2676 | } |
2677 | if (err < 0) | |
2678 | return err; | |
2679 | ||
2680 | for (i = 0; i <= NDA_MAX; ++i) { | |
2681 | if (!tb[i]) | |
2682 | continue; | |
2683 | ||
2684 | /* all new attributes should require strict_check */ | |
2685 | switch (i) { | |
2686 | case NDA_IFINDEX: | |
51183d23 DA |
2687 | filter->dev_idx = nla_get_u32(tb[i]); |
2688 | break; | |
2689 | case NDA_MASTER: | |
51183d23 DA |
2690 | filter->master_idx = nla_get_u32(tb[i]); |
2691 | break; | |
2692 | default: | |
2693 | if (strict_check) { | |
2694 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor dump request"); | |
2695 | return -EINVAL; | |
2696 | } | |
2697 | } | |
2698 | } | |
2699 | ||
2700 | return 0; | |
2701 | } | |
2702 | ||
c8822a4e | 2703 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2704 | { |
6f52f80e DA |
2705 | const struct nlmsghdr *nlh = cb->nlh; |
2706 | struct neigh_dump_filter filter = {}; | |
1da177e4 LT |
2707 | struct neigh_table *tbl; |
2708 | int t, family, s_t; | |
84920c14 | 2709 | int proxy = 0; |
4bd6683b | 2710 | int err; |
1da177e4 | 2711 | |
6f52f80e | 2712 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; |
84920c14 TZ |
2713 | |
2714 | /* check for full ndmsg structure presence, family member is | |
2715 | * the same for both structures | |
2716 | */ | |
6f52f80e DA |
2717 | if (nlmsg_len(nlh) >= sizeof(struct ndmsg) && |
2718 | ((struct ndmsg *)nlmsg_data(nlh))->ndm_flags == NTF_PROXY) | |
84920c14 TZ |
2719 | proxy = 1; |
2720 | ||
51183d23 DA |
2721 | err = neigh_valid_dump_req(nlh, cb->strict_check, &filter, cb->extack); |
2722 | if (err < 0 && cb->strict_check) | |
2723 | return err; | |
2724 | ||
1da177e4 LT |
2725 | s_t = cb->args[0]; |
2726 | ||
d7480fd3 WC |
2727 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2728 | tbl = neigh_tables[t]; | |
2729 | ||
2730 | if (!tbl) | |
2731 | continue; | |
1da177e4 LT |
2732 | if (t < s_t || (family && tbl->family != family)) |
2733 | continue; | |
2734 | if (t > s_t) | |
2735 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2736 | sizeof(cb->args[0])); | |
84920c14 | 2737 | if (proxy) |
6f52f80e | 2738 | err = pneigh_dump_table(tbl, skb, cb, &filter); |
84920c14 | 2739 | else |
6f52f80e | 2740 | err = neigh_dump_table(tbl, skb, cb, &filter); |
4bd6683b ED |
2741 | if (err < 0) |
2742 | break; | |
1da177e4 | 2743 | } |
1da177e4 LT |
2744 | |
2745 | cb->args[0] = t; | |
2746 | return skb->len; | |
2747 | } | |
2748 | ||
82cbb5c6 RP |
2749 | static int neigh_valid_get_req(const struct nlmsghdr *nlh, |
2750 | struct neigh_table **tbl, | |
2751 | void **dst, int *dev_idx, u8 *ndm_flags, | |
2752 | struct netlink_ext_ack *extack) | |
2753 | { | |
2754 | struct nlattr *tb[NDA_MAX + 1]; | |
2755 | struct ndmsg *ndm; | |
2756 | int err, i; | |
2757 | ||
2758 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2759 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request"); | |
2760 | return -EINVAL; | |
2761 | } | |
2762 | ||
2763 | ndm = nlmsg_data(nlh); | |
2764 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || | |
2765 | ndm->ndm_type) { | |
2766 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request"); | |
2767 | return -EINVAL; | |
2768 | } | |
2769 | ||
2770 | if (ndm->ndm_flags & ~NTF_PROXY) { | |
2771 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request"); | |
2772 | return -EINVAL; | |
2773 | } | |
2774 | ||
8cb08174 JB |
2775 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, |
2776 | NDA_MAX, nda_policy, extack); | |
82cbb5c6 RP |
2777 | if (err < 0) |
2778 | return err; | |
2779 | ||
2780 | *ndm_flags = ndm->ndm_flags; | |
2781 | *dev_idx = ndm->ndm_ifindex; | |
2782 | *tbl = neigh_find_table(ndm->ndm_family); | |
2783 | if (*tbl == NULL) { | |
2784 | NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request"); | |
2785 | return -EAFNOSUPPORT; | |
2786 | } | |
2787 | ||
2788 | for (i = 0; i <= NDA_MAX; ++i) { | |
2789 | if (!tb[i]) | |
2790 | continue; | |
2791 | ||
2792 | switch (i) { | |
2793 | case NDA_DST: | |
2794 | if (nla_len(tb[i]) != (int)(*tbl)->key_len) { | |
2795 | NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request"); | |
2796 | return -EINVAL; | |
2797 | } | |
2798 | *dst = nla_data(tb[i]); | |
2799 | break; | |
2800 | default: | |
2801 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request"); | |
2802 | return -EINVAL; | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | return 0; | |
2807 | } | |
2808 | ||
2809 | static inline size_t neigh_nlmsg_size(void) | |
2810 | { | |
2811 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2812 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2813 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2814 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2815 | + nla_total_size(4) /* NDA_PROBES */ | |
2816 | + nla_total_size(1); /* NDA_PROTOCOL */ | |
2817 | } | |
2818 | ||
2819 | static int neigh_get_reply(struct net *net, struct neighbour *neigh, | |
2820 | u32 pid, u32 seq) | |
2821 | { | |
2822 | struct sk_buff *skb; | |
2823 | int err = 0; | |
2824 | ||
2825 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL); | |
2826 | if (!skb) | |
2827 | return -ENOBUFS; | |
2828 | ||
2829 | err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0); | |
2830 | if (err) { | |
2831 | kfree_skb(skb); | |
2832 | goto errout; | |
2833 | } | |
2834 | ||
2835 | err = rtnl_unicast(skb, net, pid); | |
2836 | errout: | |
2837 | return err; | |
2838 | } | |
2839 | ||
2840 | static inline size_t pneigh_nlmsg_size(void) | |
2841 | { | |
2842 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
463561e6 | 2843 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
82cbb5c6 RP |
2844 | + nla_total_size(1); /* NDA_PROTOCOL */ |
2845 | } | |
2846 | ||
2847 | static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh, | |
2848 | u32 pid, u32 seq, struct neigh_table *tbl) | |
2849 | { | |
2850 | struct sk_buff *skb; | |
2851 | int err = 0; | |
2852 | ||
2853 | skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL); | |
2854 | if (!skb) | |
2855 | return -ENOBUFS; | |
2856 | ||
2857 | err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl); | |
2858 | if (err) { | |
2859 | kfree_skb(skb); | |
2860 | goto errout; | |
2861 | } | |
2862 | ||
2863 | err = rtnl_unicast(skb, net, pid); | |
2864 | errout: | |
2865 | return err; | |
2866 | } | |
2867 | ||
2868 | static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, | |
2869 | struct netlink_ext_ack *extack) | |
2870 | { | |
2871 | struct net *net = sock_net(in_skb->sk); | |
2872 | struct net_device *dev = NULL; | |
2873 | struct neigh_table *tbl = NULL; | |
2874 | struct neighbour *neigh; | |
2875 | void *dst = NULL; | |
2876 | u8 ndm_flags = 0; | |
2877 | int dev_idx = 0; | |
2878 | int err; | |
2879 | ||
2880 | err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags, | |
2881 | extack); | |
2882 | if (err < 0) | |
2883 | return err; | |
2884 | ||
2885 | if (dev_idx) { | |
2886 | dev = __dev_get_by_index(net, dev_idx); | |
2887 | if (!dev) { | |
2888 | NL_SET_ERR_MSG(extack, "Unknown device ifindex"); | |
2889 | return -ENODEV; | |
2890 | } | |
2891 | } | |
2892 | ||
2893 | if (!dst) { | |
2894 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
2895 | return -EINVAL; | |
2896 | } | |
2897 | ||
2898 | if (ndm_flags & NTF_PROXY) { | |
2899 | struct pneigh_entry *pn; | |
2900 | ||
2901 | pn = pneigh_lookup(tbl, net, dst, dev, 0); | |
2902 | if (!pn) { | |
2903 | NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found"); | |
2904 | return -ENOENT; | |
2905 | } | |
2906 | return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid, | |
2907 | nlh->nlmsg_seq, tbl); | |
2908 | } | |
2909 | ||
2910 | if (!dev) { | |
2911 | NL_SET_ERR_MSG(extack, "No device specified"); | |
2912 | return -EINVAL; | |
2913 | } | |
2914 | ||
2915 | neigh = neigh_lookup(tbl, dst, dev); | |
2916 | if (!neigh) { | |
2917 | NL_SET_ERR_MSG(extack, "Neighbour entry not found"); | |
2918 | return -ENOENT; | |
2919 | } | |
2920 | ||
2921 | err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid, | |
2922 | nlh->nlmsg_seq); | |
2923 | ||
2924 | neigh_release(neigh); | |
2925 | ||
2926 | return err; | |
2927 | } | |
2928 | ||
1da177e4 LT |
2929 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
2930 | { | |
2931 | int chain; | |
d6bf7817 | 2932 | struct neigh_hash_table *nht; |
1da177e4 | 2933 | |
d6bf7817 ED |
2934 | rcu_read_lock_bh(); |
2935 | nht = rcu_dereference_bh(tbl->nht); | |
2936 | ||
767e97e1 | 2937 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2938 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2939 | struct neighbour *n; |
2940 | ||
767e97e1 ED |
2941 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2942 | n != NULL; | |
2943 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2944 | cb(n, cookie); |
2945 | } | |
d6bf7817 ED |
2946 | read_unlock(&tbl->lock); |
2947 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2948 | } |
2949 | EXPORT_SYMBOL(neigh_for_each); | |
2950 | ||
2951 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2952 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2953 | int (*cb)(struct neighbour *)) | |
2954 | { | |
2955 | int chain; | |
d6bf7817 | 2956 | struct neigh_hash_table *nht; |
1da177e4 | 2957 | |
d6bf7817 ED |
2958 | nht = rcu_dereference_protected(tbl->nht, |
2959 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2960 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2961 | struct neighbour *n; |
2962 | struct neighbour __rcu **np; | |
1da177e4 | 2963 | |
d6bf7817 | 2964 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2965 | while ((n = rcu_dereference_protected(*np, |
2966 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2967 | int release; |
2968 | ||
2969 | write_lock(&n->lock); | |
2970 | release = cb(n); | |
2971 | if (release) { | |
767e97e1 ED |
2972 | rcu_assign_pointer(*np, |
2973 | rcu_dereference_protected(n->next, | |
2974 | lockdep_is_held(&tbl->lock))); | |
58956317 | 2975 | neigh_mark_dead(n); |
1da177e4 LT |
2976 | } else |
2977 | np = &n->next; | |
2978 | write_unlock(&n->lock); | |
4f494554 TG |
2979 | if (release) |
2980 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2981 | } |
2982 | } | |
2983 | } | |
2984 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2985 | ||
b79bda3d | 2986 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2987 | const void *addr, struct sk_buff *skb) |
2988 | { | |
b79bda3d EB |
2989 | int err = -EAFNOSUPPORT; |
2990 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2991 | struct neigh_table *tbl; |
2992 | struct neighbour *neigh; | |
2993 | ||
b79bda3d | 2994 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2995 | if (!tbl) |
2996 | goto out; | |
b560f03d | 2997 | rcu_read_lock_bh(); |
4b2a2bfe DA |
2998 | if (index == NEIGH_ARP_TABLE) { |
2999 | u32 key = *((u32 *)addr); | |
3000 | ||
3001 | neigh = __ipv4_neigh_lookup_noref(dev, key); | |
3002 | } else { | |
3003 | neigh = __neigh_lookup_noref(tbl, addr, dev); | |
3004 | } | |
4fd3d7d9 EB |
3005 | if (!neigh) |
3006 | neigh = __neigh_create(tbl, addr, dev, false); | |
3007 | err = PTR_ERR(neigh); | |
b560f03d DB |
3008 | if (IS_ERR(neigh)) { |
3009 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 3010 | goto out_kfree_skb; |
b560f03d | 3011 | } |
4fd3d7d9 | 3012 | err = neigh->output(neigh, skb); |
b560f03d | 3013 | rcu_read_unlock_bh(); |
4fd3d7d9 | 3014 | } |
b79bda3d EB |
3015 | else if (index == NEIGH_LINK_TABLE) { |
3016 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
3017 | addr, NULL, skb->len); | |
3018 | if (err < 0) | |
3019 | goto out_kfree_skb; | |
3020 | err = dev_queue_xmit(skb); | |
3021 | } | |
4fd3d7d9 EB |
3022 | out: |
3023 | return err; | |
3024 | out_kfree_skb: | |
3025 | kfree_skb(skb); | |
3026 | goto out; | |
3027 | } | |
3028 | EXPORT_SYMBOL(neigh_xmit); | |
3029 | ||
1da177e4 LT |
3030 | #ifdef CONFIG_PROC_FS |
3031 | ||
3032 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
3033 | { | |
3034 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3035 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3036 | struct neigh_hash_table *nht = state->nht; |
1da177e4 | 3037 | struct neighbour *n = NULL; |
f530eed6 | 3038 | int bucket; |
1da177e4 LT |
3039 | |
3040 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 3041 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 3042 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
3043 | |
3044 | while (n) { | |
878628fb | 3045 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3046 | goto next; |
1da177e4 LT |
3047 | if (state->neigh_sub_iter) { |
3048 | loff_t fakep = 0; | |
3049 | void *v; | |
3050 | ||
3051 | v = state->neigh_sub_iter(state, n, &fakep); | |
3052 | if (!v) | |
3053 | goto next; | |
3054 | } | |
3055 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3056 | break; | |
3057 | if (n->nud_state & ~NUD_NOARP) | |
3058 | break; | |
767e97e1 ED |
3059 | next: |
3060 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3061 | } |
3062 | ||
3063 | if (n) | |
3064 | break; | |
3065 | } | |
3066 | state->bucket = bucket; | |
3067 | ||
3068 | return n; | |
3069 | } | |
3070 | ||
3071 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
3072 | struct neighbour *n, | |
3073 | loff_t *pos) | |
3074 | { | |
3075 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3076 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3077 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
3078 | |
3079 | if (state->neigh_sub_iter) { | |
3080 | void *v = state->neigh_sub_iter(state, n, pos); | |
3081 | if (v) | |
3082 | return n; | |
3083 | } | |
767e97e1 | 3084 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
3085 | |
3086 | while (1) { | |
3087 | while (n) { | |
878628fb | 3088 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3089 | goto next; |
1da177e4 LT |
3090 | if (state->neigh_sub_iter) { |
3091 | void *v = state->neigh_sub_iter(state, n, pos); | |
3092 | if (v) | |
3093 | return n; | |
3094 | goto next; | |
3095 | } | |
3096 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3097 | break; | |
3098 | ||
3099 | if (n->nud_state & ~NUD_NOARP) | |
3100 | break; | |
767e97e1 ED |
3101 | next: |
3102 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3103 | } |
3104 | ||
3105 | if (n) | |
3106 | break; | |
3107 | ||
cd089336 | 3108 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
3109 | break; |
3110 | ||
767e97e1 | 3111 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
3112 | } |
3113 | ||
3114 | if (n && pos) | |
3115 | --(*pos); | |
3116 | return n; | |
3117 | } | |
3118 | ||
3119 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3120 | { | |
3121 | struct neighbour *n = neigh_get_first(seq); | |
3122 | ||
3123 | if (n) { | |
745e2031 | 3124 | --(*pos); |
1da177e4 LT |
3125 | while (*pos) { |
3126 | n = neigh_get_next(seq, n, pos); | |
3127 | if (!n) | |
3128 | break; | |
3129 | } | |
3130 | } | |
3131 | return *pos ? NULL : n; | |
3132 | } | |
3133 | ||
3134 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
3135 | { | |
3136 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3137 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3138 | struct neigh_table *tbl = state->tbl; |
3139 | struct pneigh_entry *pn = NULL; | |
3140 | int bucket = state->bucket; | |
3141 | ||
3142 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
3143 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
3144 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 3145 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3146 | pn = pn->next; |
1da177e4 LT |
3147 | if (pn) |
3148 | break; | |
3149 | } | |
3150 | state->bucket = bucket; | |
3151 | ||
3152 | return pn; | |
3153 | } | |
3154 | ||
3155 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
3156 | struct pneigh_entry *pn, | |
3157 | loff_t *pos) | |
3158 | { | |
3159 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3160 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3161 | struct neigh_table *tbl = state->tbl; |
3162 | ||
df07a94c JBD |
3163 | do { |
3164 | pn = pn->next; | |
3165 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
3166 | ||
1da177e4 LT |
3167 | while (!pn) { |
3168 | if (++state->bucket > PNEIGH_HASHMASK) | |
3169 | break; | |
3170 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 3171 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3172 | pn = pn->next; |
1da177e4 LT |
3173 | if (pn) |
3174 | break; | |
3175 | } | |
3176 | ||
3177 | if (pn && pos) | |
3178 | --(*pos); | |
3179 | ||
3180 | return pn; | |
3181 | } | |
3182 | ||
3183 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3184 | { | |
3185 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
3186 | ||
3187 | if (pn) { | |
745e2031 | 3188 | --(*pos); |
1da177e4 LT |
3189 | while (*pos) { |
3190 | pn = pneigh_get_next(seq, pn, pos); | |
3191 | if (!pn) | |
3192 | break; | |
3193 | } | |
3194 | } | |
3195 | return *pos ? NULL : pn; | |
3196 | } | |
3197 | ||
3198 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
3199 | { | |
3200 | struct neigh_seq_state *state = seq->private; | |
3201 | void *rc; | |
745e2031 | 3202 | loff_t idxpos = *pos; |
1da177e4 | 3203 | |
745e2031 | 3204 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 3205 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 3206 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
3207 | |
3208 | return rc; | |
3209 | } | |
3210 | ||
3211 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
f3e92cb8 | 3212 | __acquires(tbl->lock) |
d6bf7817 | 3213 | __acquires(rcu_bh) |
1da177e4 LT |
3214 | { |
3215 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
3216 | |
3217 | state->tbl = tbl; | |
3218 | state->bucket = 0; | |
3219 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
3220 | ||
d6bf7817 ED |
3221 | rcu_read_lock_bh(); |
3222 | state->nht = rcu_dereference_bh(tbl->nht); | |
f3e92cb8 | 3223 | read_lock(&tbl->lock); |
767e97e1 | 3224 | |
745e2031 | 3225 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
3226 | } |
3227 | EXPORT_SYMBOL(neigh_seq_start); | |
3228 | ||
3229 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3230 | { | |
3231 | struct neigh_seq_state *state; | |
3232 | void *rc; | |
3233 | ||
3234 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 3235 | rc = neigh_get_first(seq); |
1da177e4 LT |
3236 | goto out; |
3237 | } | |
3238 | ||
3239 | state = seq->private; | |
3240 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
3241 | rc = neigh_get_next(seq, v, NULL); | |
3242 | if (rc) | |
3243 | goto out; | |
3244 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
3245 | rc = pneigh_get_first(seq); | |
3246 | } else { | |
3247 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
3248 | rc = pneigh_get_next(seq, v, NULL); | |
3249 | } | |
3250 | out: | |
3251 | ++(*pos); | |
3252 | return rc; | |
3253 | } | |
3254 | EXPORT_SYMBOL(neigh_seq_next); | |
3255 | ||
3256 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
f3e92cb8 | 3257 | __releases(tbl->lock) |
d6bf7817 | 3258 | __releases(rcu_bh) |
1da177e4 | 3259 | { |
f3e92cb8 ED |
3260 | struct neigh_seq_state *state = seq->private; |
3261 | struct neigh_table *tbl = state->tbl; | |
3262 | ||
3263 | read_unlock(&tbl->lock); | |
d6bf7817 | 3264 | rcu_read_unlock_bh(); |
1da177e4 LT |
3265 | } |
3266 | EXPORT_SYMBOL(neigh_seq_stop); | |
3267 | ||
3268 | /* statistics via seq_file */ | |
3269 | ||
3270 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
3271 | { | |
71a5053a | 3272 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3273 | int cpu; |
3274 | ||
3275 | if (*pos == 0) | |
3276 | return SEQ_START_TOKEN; | |
4ec93edb | 3277 | |
0f23174a | 3278 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3279 | if (!cpu_possible(cpu)) |
3280 | continue; | |
3281 | *pos = cpu+1; | |
3282 | return per_cpu_ptr(tbl->stats, cpu); | |
3283 | } | |
3284 | return NULL; | |
3285 | } | |
3286 | ||
3287 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3288 | { | |
71a5053a | 3289 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3290 | int cpu; |
3291 | ||
0f23174a | 3292 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3293 | if (!cpu_possible(cpu)) |
3294 | continue; | |
3295 | *pos = cpu+1; | |
3296 | return per_cpu_ptr(tbl->stats, cpu); | |
3297 | } | |
1e3f9f07 | 3298 | (*pos)++; |
1da177e4 LT |
3299 | return NULL; |
3300 | } | |
3301 | ||
3302 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
3303 | { | |
3304 | ||
3305 | } | |
3306 | ||
3307 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
3308 | { | |
71a5053a | 3309 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3310 | struct neigh_statistics *st = v; |
3311 | ||
3312 | if (v == SEQ_START_TOKEN) { | |
fb811395 | 3313 | 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 |
3314 | return 0; |
3315 | } | |
3316 | ||
3317 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
fb811395 | 3318 | "%08lx %08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
3319 | atomic_read(&tbl->entries), |
3320 | ||
3321 | st->allocs, | |
3322 | st->destroys, | |
3323 | st->hash_grows, | |
3324 | ||
3325 | st->lookups, | |
3326 | st->hits, | |
3327 | ||
3328 | st->res_failed, | |
3329 | ||
3330 | st->rcv_probes_mcast, | |
3331 | st->rcv_probes_ucast, | |
3332 | ||
3333 | st->periodic_gc_runs, | |
9a6d276e | 3334 | st->forced_gc_runs, |
fb811395 RJ |
3335 | st->unres_discards, |
3336 | st->table_fulls | |
1da177e4 LT |
3337 | ); |
3338 | ||
3339 | return 0; | |
3340 | } | |
3341 | ||
f690808e | 3342 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
3343 | .start = neigh_stat_seq_start, |
3344 | .next = neigh_stat_seq_next, | |
3345 | .stop = neigh_stat_seq_stop, | |
3346 | .show = neigh_stat_seq_show, | |
3347 | }; | |
1da177e4 LT |
3348 | #endif /* CONFIG_PROC_FS */ |
3349 | ||
7b8f7a40 RP |
3350 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
3351 | u32 pid) | |
1da177e4 | 3352 | { |
c346dca1 | 3353 | struct net *net = dev_net(n->dev); |
8b8aec50 | 3354 | struct sk_buff *skb; |
b8673311 | 3355 | int err = -ENOBUFS; |
1da177e4 | 3356 | |
339bf98f | 3357 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 3358 | if (skb == NULL) |
b8673311 | 3359 | goto errout; |
1da177e4 | 3360 | |
7b8f7a40 | 3361 | err = neigh_fill_info(skb, n, pid, 0, type, flags); |
26932566 PM |
3362 | if (err < 0) { |
3363 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
3364 | WARN_ON(err == -EMSGSIZE); | |
3365 | kfree_skb(skb); | |
3366 | goto errout; | |
3367 | } | |
1ce85fe4 PNA |
3368 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
3369 | return; | |
b8673311 TG |
3370 | errout: |
3371 | if (err < 0) | |
426b5303 | 3372 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
3373 | } |
3374 | ||
b8673311 | 3375 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 3376 | { |
7b8f7a40 | 3377 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0); |
b8673311 | 3378 | } |
0a204500 | 3379 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
3380 | |
3381 | #ifdef CONFIG_SYSCTL | |
b93196dc | 3382 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 3383 | |
fe2c6338 | 3384 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
32927393 | 3385 | void *buffer, size_t *lenp, loff_t *ppos) |
8b5c171b ED |
3386 | { |
3387 | int size, ret; | |
fe2c6338 | 3388 | struct ctl_table tmp = *ctl; |
8b5c171b | 3389 | |
eec4844f | 3390 | tmp.extra1 = SYSCTL_ZERO; |
ce46cc64 | 3391 | tmp.extra2 = &unres_qlen_max; |
8b5c171b | 3392 | tmp.data = &size; |
ce46cc64 SW |
3393 | |
3394 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
3395 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
3396 | ||
8b5c171b ED |
3397 | if (write && !ret) |
3398 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
3399 | return ret; | |
3400 | } | |
3401 | ||
1d4c8c29 JP |
3402 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
3403 | int family) | |
3404 | { | |
bba24896 JP |
3405 | switch (family) { |
3406 | case AF_INET: | |
1d4c8c29 | 3407 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
3408 | case AF_INET6: |
3409 | return __in6_dev_nd_parms_get_rcu(dev); | |
3410 | } | |
1d4c8c29 JP |
3411 | return NULL; |
3412 | } | |
3413 | ||
3414 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
3415 | int index) | |
3416 | { | |
3417 | struct net_device *dev; | |
3418 | int family = neigh_parms_family(p); | |
3419 | ||
3420 | rcu_read_lock(); | |
3421 | for_each_netdev_rcu(net, dev) { | |
3422 | struct neigh_parms *dst_p = | |
3423 | neigh_get_dev_parms_rcu(dev, family); | |
3424 | ||
3425 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
3426 | dst_p->data[index] = p->data[index]; | |
3427 | } | |
3428 | rcu_read_unlock(); | |
3429 | } | |
3430 | ||
3431 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
3432 | { | |
3433 | struct net_device *dev = ctl->extra1; | |
3434 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 3435 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
3436 | int index = (int *) ctl->data - p->data; |
3437 | ||
3438 | if (!write) | |
3439 | return; | |
3440 | ||
3441 | set_bit(index, p->data_state); | |
7627ae60 MH |
3442 | if (index == NEIGH_VAR_DELAY_PROBE_TIME) |
3443 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); | |
1d4c8c29 JP |
3444 | if (!dev) /* NULL dev means this is default value */ |
3445 | neigh_copy_dflt_parms(net, p, index); | |
3446 | } | |
3447 | ||
1f9248e5 | 3448 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
32927393 CH |
3449 | void *buffer, size_t *lenp, |
3450 | loff_t *ppos) | |
1f9248e5 JP |
3451 | { |
3452 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 3453 | int ret; |
1f9248e5 | 3454 | |
eec4844f MC |
3455 | tmp.extra1 = SYSCTL_ZERO; |
3456 | tmp.extra2 = SYSCTL_INT_MAX; | |
1f9248e5 | 3457 | |
1d4c8c29 JP |
3458 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
3459 | neigh_proc_update(ctl, write); | |
3460 | return ret; | |
1f9248e5 JP |
3461 | } |
3462 | ||
32927393 CH |
3463 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, void *buffer, |
3464 | size_t *lenp, loff_t *ppos) | |
cb5b09c1 | 3465 | { |
1d4c8c29 JP |
3466 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
3467 | ||
3468 | neigh_proc_update(ctl, write); | |
3469 | return ret; | |
cb5b09c1 JP |
3470 | } |
3471 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
3472 | ||
32927393 | 3473 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, void *buffer, |
cb5b09c1 JP |
3474 | size_t *lenp, loff_t *ppos) |
3475 | { | |
1d4c8c29 JP |
3476 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
3477 | ||
3478 | neigh_proc_update(ctl, write); | |
3479 | return ret; | |
cb5b09c1 JP |
3480 | } |
3481 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
3482 | ||
3483 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
32927393 CH |
3484 | void *buffer, size_t *lenp, |
3485 | loff_t *ppos) | |
cb5b09c1 | 3486 | { |
1d4c8c29 JP |
3487 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
3488 | ||
3489 | neigh_proc_update(ctl, write); | |
3490 | return ret; | |
cb5b09c1 JP |
3491 | } |
3492 | ||
3493 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
32927393 | 3494 | void *buffer, size_t *lenp, loff_t *ppos) |
cb5b09c1 | 3495 | { |
1d4c8c29 JP |
3496 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
3497 | ||
3498 | neigh_proc_update(ctl, write); | |
3499 | return ret; | |
cb5b09c1 JP |
3500 | } |
3501 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
3502 | ||
3503 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
32927393 CH |
3504 | void *buffer, size_t *lenp, |
3505 | loff_t *ppos) | |
cb5b09c1 | 3506 | { |
1d4c8c29 JP |
3507 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
3508 | ||
3509 | neigh_proc_update(ctl, write); | |
3510 | return ret; | |
cb5b09c1 JP |
3511 | } |
3512 | ||
4bf6980d | 3513 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
32927393 CH |
3514 | void *buffer, size_t *lenp, |
3515 | loff_t *ppos) | |
4bf6980d JFR |
3516 | { |
3517 | struct neigh_parms *p = ctl->extra2; | |
3518 | int ret; | |
3519 | ||
3520 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3521 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3522 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3523 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3524 | else | |
3525 | ret = -1; | |
3526 | ||
3527 | if (write && ret == 0) { | |
3528 | /* update reachable_time as well, otherwise, the change will | |
3529 | * only be effective after the next time neigh_periodic_work | |
3530 | * decides to recompute it | |
3531 | */ | |
3532 | p->reachable_time = | |
3533 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3534 | } | |
3535 | return ret; | |
3536 | } | |
3537 | ||
1f9248e5 JP |
3538 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3539 | (&((struct neigh_parms *) 0)->data[index]) | |
3540 | ||
3541 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3542 | [NEIGH_VAR_ ## attr] = { \ | |
3543 | .procname = name, \ | |
3544 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3545 | .maxlen = sizeof(int), \ | |
3546 | .mode = mval, \ | |
3547 | .proc_handler = proc, \ | |
3548 | } | |
3549 | ||
3550 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3551 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3552 | ||
3553 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3554 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3555 | |
3556 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3557 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 | 3558 | |
1f9248e5 | 3559 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ |
cb5b09c1 | 3560 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3561 | |
3562 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3563 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3564 | |
1da177e4 LT |
3565 | static struct neigh_sysctl_table { |
3566 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3567 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3568 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3569 | .neigh_vars = { |
1f9248e5 JP |
3570 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3571 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3572 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3573 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3574 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3575 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3576 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3577 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3578 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3579 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3580 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3581 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3582 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3583 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3584 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3585 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3586 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3587 | .procname = "gc_interval", |
3588 | .maxlen = sizeof(int), | |
3589 | .mode = 0644, | |
6d9f239a | 3590 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3591 | }, |
8b5c171b | 3592 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3593 | .procname = "gc_thresh1", |
3594 | .maxlen = sizeof(int), | |
3595 | .mode = 0644, | |
eec4844f MC |
3596 | .extra1 = SYSCTL_ZERO, |
3597 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3598 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3599 | }, |
8b5c171b | 3600 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3601 | .procname = "gc_thresh2", |
3602 | .maxlen = sizeof(int), | |
3603 | .mode = 0644, | |
eec4844f MC |
3604 | .extra1 = SYSCTL_ZERO, |
3605 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3606 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3607 | }, |
8b5c171b | 3608 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3609 | .procname = "gc_thresh3", |
3610 | .maxlen = sizeof(int), | |
3611 | .mode = 0644, | |
eec4844f MC |
3612 | .extra1 = SYSCTL_ZERO, |
3613 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3614 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3615 | }, |
c3bac5a7 | 3616 | {}, |
1da177e4 LT |
3617 | }, |
3618 | }; | |
3619 | ||
3620 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3621 | proc_handler *handler) |
1da177e4 | 3622 | { |
1f9248e5 | 3623 | int i; |
3c607bbb | 3624 | struct neigh_sysctl_table *t; |
1f9248e5 | 3625 | const char *dev_name_source; |
8f40a1f9 | 3626 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3627 | char *p_name; |
1da177e4 | 3628 | |
3c607bbb | 3629 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3630 | if (!t) |
3c607bbb PE |
3631 | goto err; |
3632 | ||
b194c1f1 | 3633 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3634 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3635 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3636 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3637 | } |
1da177e4 LT |
3638 | |
3639 | if (dev) { | |
3640 | dev_name_source = dev->name; | |
d12af679 | 3641 | /* Terminate the table early */ |
8b5c171b ED |
3642 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3643 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3644 | } else { |
9ecf07a1 | 3645 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3646 | dev_name_source = "default"; |
9ecf07a1 MK |
3647 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3648 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3649 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3650 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3651 | } |
3652 | ||
f8572d8f | 3653 | if (handler) { |
1da177e4 | 3654 | /* RetransTime */ |
8b5c171b | 3655 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3656 | /* ReachableTime */ |
8b5c171b | 3657 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3658 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3659 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3660 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3661 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3662 | } else { |
3663 | /* Those handlers will update p->reachable_time after | |
3664 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3665 | * applied after the next neighbour update instead of waiting for | |
3666 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3667 | * So any handler that replaces them should do this as well | |
3668 | */ | |
3669 | /* ReachableTime */ | |
3670 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3671 | neigh_proc_base_reachable_time; | |
3672 | /* ReachableTime (in milliseconds) */ | |
3673 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3674 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3675 | } |
3676 | ||
464dc801 EB |
3677 | /* Don't export sysctls to unprivileged users */ |
3678 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3679 | t->neigh_vars[0].procname = NULL; | |
3680 | ||
73af614a JP |
3681 | switch (neigh_parms_family(p)) { |
3682 | case AF_INET: | |
3683 | p_name = "ipv4"; | |
3684 | break; | |
3685 | case AF_INET6: | |
3686 | p_name = "ipv6"; | |
3687 | break; | |
3688 | default: | |
3689 | BUG(); | |
3690 | } | |
3691 | ||
8f40a1f9 EB |
3692 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3693 | p_name, dev_name_source); | |
4ab438fc | 3694 | t->sysctl_header = |
8f40a1f9 | 3695 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3696 | if (!t->sysctl_header) |
8f40a1f9 | 3697 | goto free; |
3c607bbb | 3698 | |
1da177e4 LT |
3699 | p->sysctl_table = t; |
3700 | return 0; | |
3701 | ||
3c607bbb | 3702 | free: |
1da177e4 | 3703 | kfree(t); |
3c607bbb PE |
3704 | err: |
3705 | return -ENOBUFS; | |
1da177e4 | 3706 | } |
0a204500 | 3707 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3708 | |
3709 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3710 | { | |
3711 | if (p->sysctl_table) { | |
3712 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3713 | p->sysctl_table = NULL; | |
5dd3df10 | 3714 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3715 | kfree(t); |
3716 | } | |
3717 | } | |
0a204500 | 3718 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3719 | |
3720 | #endif /* CONFIG_SYSCTL */ | |
3721 | ||
c8822a4e TG |
3722 | static int __init neigh_init(void) |
3723 | { | |
b97bac64 FW |
3724 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0); |
3725 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0); | |
82cbb5c6 | 3726 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0); |
c8822a4e | 3727 | |
c7ac8679 | 3728 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
b97bac64 FW |
3729 | 0); |
3730 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, 0); | |
c8822a4e TG |
3731 | |
3732 | return 0; | |
3733 | } | |
3734 | ||
3735 | subsys_initcall(neigh_init); |