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 | } | |
7482e384 DB |
125 | if (!list_empty(&n->managed_list)) |
126 | list_del_init(&n->managed_list); | |
58956317 DA |
127 | } |
128 | ||
9c29a2f5 | 129 | static void neigh_update_gc_list(struct neighbour *n) |
58956317 | 130 | { |
e997f8a2 | 131 | bool on_gc_list, exempt_from_gc; |
58956317 | 132 | |
9c29a2f5 DA |
133 | write_lock_bh(&n->tbl->lock); |
134 | write_lock(&n->lock); | |
eefb45ee CA |
135 | if (n->dead) |
136 | goto out; | |
137 | ||
e997f8a2 DA |
138 | /* remove from the gc list if new state is permanent or if neighbor |
139 | * is externally learned; otherwise entry should be on the gc list | |
58956317 | 140 | */ |
e997f8a2 DA |
141 | exempt_from_gc = n->nud_state & NUD_PERMANENT || |
142 | n->flags & NTF_EXT_LEARNED; | |
9c29a2f5 DA |
143 | on_gc_list = !list_empty(&n->gc_list); |
144 | ||
e997f8a2 | 145 | if (exempt_from_gc && on_gc_list) { |
58956317 DA |
146 | list_del_init(&n->gc_list); |
147 | atomic_dec(&n->tbl->gc_entries); | |
e997f8a2 | 148 | } else if (!exempt_from_gc && !on_gc_list) { |
58956317 DA |
149 | /* add entries to the tail; cleaning removes from the front */ |
150 | list_add_tail(&n->gc_list, &n->tbl->gc_list); | |
151 | atomic_inc(&n->tbl->gc_entries); | |
152 | } | |
7482e384 DB |
153 | out: |
154 | write_unlock(&n->lock); | |
155 | write_unlock_bh(&n->tbl->lock); | |
156 | } | |
157 | ||
158 | static void neigh_update_managed_list(struct neighbour *n) | |
159 | { | |
160 | bool on_managed_list, add_to_managed; | |
161 | ||
162 | write_lock_bh(&n->tbl->lock); | |
163 | write_lock(&n->lock); | |
164 | if (n->dead) | |
165 | goto out; | |
166 | ||
167 | add_to_managed = n->flags & NTF_MANAGED; | |
168 | on_managed_list = !list_empty(&n->managed_list); | |
9c29a2f5 | 169 | |
7482e384 DB |
170 | if (!add_to_managed && on_managed_list) |
171 | list_del_init(&n->managed_list); | |
172 | else if (add_to_managed && !on_managed_list) | |
173 | list_add_tail(&n->managed_list, &n->tbl->managed_list); | |
eefb45ee | 174 | out: |
9c29a2f5 DA |
175 | write_unlock(&n->lock); |
176 | write_unlock_bh(&n->tbl->lock); | |
58956317 | 177 | } |
1da177e4 | 178 | |
7482e384 DB |
179 | static void neigh_update_flags(struct neighbour *neigh, u32 flags, int *notify, |
180 | bool *gc_update, bool *managed_update) | |
526f1b58 | 181 | { |
7482e384 | 182 | u32 ndm_flags, old_flags = neigh->flags; |
526f1b58 DA |
183 | |
184 | if (!(flags & NEIGH_UPDATE_F_ADMIN)) | |
7482e384 DB |
185 | return; |
186 | ||
187 | ndm_flags = (flags & NEIGH_UPDATE_F_EXT_LEARNED) ? NTF_EXT_LEARNED : 0; | |
188 | ndm_flags |= (flags & NEIGH_UPDATE_F_MANAGED) ? NTF_MANAGED : 0; | |
526f1b58 | 189 | |
7482e384 | 190 | if ((old_flags ^ ndm_flags) & NTF_EXT_LEARNED) { |
526f1b58 DA |
191 | if (ndm_flags & NTF_EXT_LEARNED) |
192 | neigh->flags |= NTF_EXT_LEARNED; | |
193 | else | |
194 | neigh->flags &= ~NTF_EXT_LEARNED; | |
195 | *notify = 1; | |
7482e384 DB |
196 | *gc_update = true; |
197 | } | |
198 | if ((old_flags ^ ndm_flags) & NTF_MANAGED) { | |
199 | if (ndm_flags & NTF_MANAGED) | |
200 | neigh->flags |= NTF_MANAGED; | |
201 | else | |
202 | neigh->flags &= ~NTF_MANAGED; | |
203 | *notify = 1; | |
204 | *managed_update = true; | |
526f1b58 DA |
205 | } |
206 | } | |
207 | ||
7e6f182b DA |
208 | static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np, |
209 | struct neigh_table *tbl) | |
5071034e SV |
210 | { |
211 | bool retval = false; | |
212 | ||
213 | write_lock(&n->lock); | |
7e6f182b | 214 | if (refcount_read(&n->refcnt) == 1) { |
5071034e SV |
215 | struct neighbour *neigh; |
216 | ||
217 | neigh = rcu_dereference_protected(n->next, | |
218 | lockdep_is_held(&tbl->lock)); | |
219 | rcu_assign_pointer(*np, neigh); | |
58956317 | 220 | neigh_mark_dead(n); |
5071034e SV |
221 | retval = true; |
222 | } | |
223 | write_unlock(&n->lock); | |
224 | if (retval) | |
225 | neigh_cleanup_and_release(n); | |
226 | return retval; | |
227 | } | |
228 | ||
229 | bool neigh_remove_one(struct neighbour *ndel, struct neigh_table *tbl) | |
230 | { | |
231 | struct neigh_hash_table *nht; | |
232 | void *pkey = ndel->primary_key; | |
233 | u32 hash_val; | |
234 | struct neighbour *n; | |
235 | struct neighbour __rcu **np; | |
236 | ||
237 | nht = rcu_dereference_protected(tbl->nht, | |
238 | lockdep_is_held(&tbl->lock)); | |
239 | hash_val = tbl->hash(pkey, ndel->dev, nht->hash_rnd); | |
240 | hash_val = hash_val >> (32 - nht->hash_shift); | |
241 | ||
242 | np = &nht->hash_buckets[hash_val]; | |
243 | while ((n = rcu_dereference_protected(*np, | |
244 | lockdep_is_held(&tbl->lock)))) { | |
245 | if (n == ndel) | |
7e6f182b | 246 | return neigh_del(n, np, tbl); |
5071034e SV |
247 | np = &n->next; |
248 | } | |
249 | return false; | |
250 | } | |
251 | ||
1da177e4 LT |
252 | static int neigh_forced_gc(struct neigh_table *tbl) |
253 | { | |
58956317 DA |
254 | int max_clean = atomic_read(&tbl->gc_entries) - tbl->gc_thresh2; |
255 | unsigned long tref = jiffies - 5 * HZ; | |
58956317 | 256 | struct neighbour *n, *tmp; |
1da177e4 | 257 | int shrunk = 0; |
1da177e4 LT |
258 | |
259 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
260 | ||
261 | write_lock_bh(&tbl->lock); | |
1da177e4 | 262 | |
58956317 DA |
263 | list_for_each_entry_safe(n, tmp, &tbl->gc_list, gc_list) { |
264 | if (refcount_read(&n->refcnt) == 1) { | |
265 | bool remove = false; | |
266 | ||
267 | write_lock(&n->lock); | |
758a7f0b | 268 | if ((n->nud_state == NUD_FAILED) || |
7a6b1ab7 | 269 | (n->nud_state == NUD_NOARP) || |
8cf8821e JD |
270 | (tbl->is_multicast && |
271 | tbl->is_multicast(n->primary_key)) || | |
e997f8a2 | 272 | time_after(tref, n->updated)) |
58956317 DA |
273 | remove = true; |
274 | write_unlock(&n->lock); | |
275 | ||
276 | if (remove && neigh_remove_one(n, tbl)) | |
277 | shrunk++; | |
278 | if (shrunk >= max_clean) | |
279 | break; | |
1da177e4 LT |
280 | } |
281 | } | |
282 | ||
283 | tbl->last_flush = jiffies; | |
284 | ||
285 | write_unlock_bh(&tbl->lock); | |
286 | ||
287 | return shrunk; | |
288 | } | |
289 | ||
a43d8994 PE |
290 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
291 | { | |
292 | neigh_hold(n); | |
293 | if (unlikely(mod_timer(&n->timer, when))) { | |
294 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
295 | n->nud_state); | |
296 | dump_stack(); | |
297 | } | |
298 | } | |
299 | ||
1da177e4 LT |
300 | static int neigh_del_timer(struct neighbour *n) |
301 | { | |
302 | if ((n->nud_state & NUD_IN_TIMER) && | |
303 | del_timer(&n->timer)) { | |
304 | neigh_release(n); | |
305 | return 1; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
311 | { | |
312 | struct sk_buff *skb; | |
313 | ||
314 | while ((skb = skb_dequeue(list)) != NULL) { | |
315 | dev_put(skb->dev); | |
316 | kfree_skb(skb); | |
317 | } | |
318 | } | |
319 | ||
859bd2ef DA |
320 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev, |
321 | bool skip_perm) | |
1da177e4 LT |
322 | { |
323 | int i; | |
d6bf7817 | 324 | struct neigh_hash_table *nht; |
1da177e4 | 325 | |
d6bf7817 ED |
326 | nht = rcu_dereference_protected(tbl->nht, |
327 | lockdep_is_held(&tbl->lock)); | |
328 | ||
cd089336 | 329 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
330 | struct neighbour *n; |
331 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 332 | |
767e97e1 ED |
333 | while ((n = rcu_dereference_protected(*np, |
334 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
335 | if (dev && n->dev != dev) { |
336 | np = &n->next; | |
337 | continue; | |
338 | } | |
859bd2ef DA |
339 | if (skip_perm && n->nud_state & NUD_PERMANENT) { |
340 | np = &n->next; | |
341 | continue; | |
342 | } | |
767e97e1 ED |
343 | rcu_assign_pointer(*np, |
344 | rcu_dereference_protected(n->next, | |
345 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
346 | write_lock(&n->lock); |
347 | neigh_del_timer(n); | |
58956317 | 348 | neigh_mark_dead(n); |
9f237430 | 349 | if (refcount_read(&n->refcnt) != 1) { |
1da177e4 LT |
350 | /* The most unpleasant situation. |
351 | We must destroy neighbour entry, | |
352 | but someone still uses it. | |
353 | ||
354 | The destroy will be delayed until | |
355 | the last user releases us, but | |
356 | we must kill timers etc. and move | |
357 | it to safe state. | |
358 | */ | |
c9ab4d85 | 359 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 360 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
361 | n->output = neigh_blackhole; |
362 | if (n->nud_state & NUD_VALID) | |
363 | n->nud_state = NUD_NOARP; | |
364 | else | |
365 | n->nud_state = NUD_NONE; | |
d5d427cd | 366 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
367 | } |
368 | write_unlock(&n->lock); | |
4f494554 | 369 | neigh_cleanup_and_release(n); |
1da177e4 LT |
370 | } |
371 | } | |
49636bb1 | 372 | } |
1da177e4 | 373 | |
49636bb1 HX |
374 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
375 | { | |
376 | write_lock_bh(&tbl->lock); | |
859bd2ef | 377 | neigh_flush_dev(tbl, dev, false); |
49636bb1 HX |
378 | write_unlock_bh(&tbl->lock); |
379 | } | |
0a204500 | 380 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 | 381 | |
859bd2ef DA |
382 | static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev, |
383 | bool skip_perm) | |
49636bb1 HX |
384 | { |
385 | write_lock_bh(&tbl->lock); | |
859bd2ef | 386 | neigh_flush_dev(tbl, dev, skip_perm); |
53b76cdf | 387 | pneigh_ifdown_and_unlock(tbl, dev); |
1da177e4 LT |
388 | |
389 | del_timer_sync(&tbl->proxy_timer); | |
390 | pneigh_queue_purge(&tbl->proxy_queue); | |
391 | return 0; | |
392 | } | |
859bd2ef DA |
393 | |
394 | int neigh_carrier_down(struct neigh_table *tbl, struct net_device *dev) | |
395 | { | |
396 | __neigh_ifdown(tbl, dev, true); | |
397 | return 0; | |
398 | } | |
399 | EXPORT_SYMBOL(neigh_carrier_down); | |
400 | ||
401 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
402 | { | |
403 | __neigh_ifdown(tbl, dev, false); | |
404 | return 0; | |
405 | } | |
0a204500 | 406 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 407 | |
58956317 DA |
408 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, |
409 | struct net_device *dev, | |
2c611ad9 | 410 | u32 flags, bool exempt_from_gc) |
1da177e4 LT |
411 | { |
412 | struct neighbour *n = NULL; | |
413 | unsigned long now = jiffies; | |
414 | int entries; | |
415 | ||
e997f8a2 | 416 | if (exempt_from_gc) |
58956317 DA |
417 | goto do_alloc; |
418 | ||
419 | entries = atomic_inc_return(&tbl->gc_entries) - 1; | |
1da177e4 LT |
420 | if (entries >= tbl->gc_thresh3 || |
421 | (entries >= tbl->gc_thresh2 && | |
422 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
423 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
424 | entries >= tbl->gc_thresh3) { |
425 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
426 | tbl->id); | |
427 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 428 | goto out_entries; |
fb811395 | 429 | } |
1da177e4 LT |
430 | } |
431 | ||
58956317 | 432 | do_alloc: |
08433eff | 433 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
434 | if (!n) |
435 | goto out_entries; | |
436 | ||
c9ab4d85 | 437 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 438 | rwlock_init(&n->lock); |
0ed8ddf4 | 439 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
440 | n->updated = n->used = now; |
441 | n->nud_state = NUD_NONE; | |
442 | n->output = neigh_blackhole; | |
e4400bbf | 443 | n->flags = flags; |
f6b72b62 | 444 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 445 | n->parms = neigh_parms_clone(&tbl->parms); |
e99e88a9 | 446 | timer_setup(&n->timer, neigh_timer_handler, 0); |
1da177e4 LT |
447 | |
448 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
449 | n->tbl = tbl; | |
9f237430 | 450 | refcount_set(&n->refcnt, 1); |
1da177e4 | 451 | n->dead = 1; |
8cc196d6 | 452 | INIT_LIST_HEAD(&n->gc_list); |
7482e384 | 453 | INIT_LIST_HEAD(&n->managed_list); |
58956317 DA |
454 | |
455 | atomic_inc(&tbl->entries); | |
1da177e4 LT |
456 | out: |
457 | return n; | |
458 | ||
459 | out_entries: | |
e997f8a2 | 460 | if (!exempt_from_gc) |
58956317 | 461 | atomic_dec(&tbl->gc_entries); |
1da177e4 LT |
462 | goto out; |
463 | } | |
464 | ||
2c2aba6c DM |
465 | static void neigh_get_hash_rnd(u32 *x) |
466 | { | |
b3d0f789 | 467 | *x = get_random_u32() | 1; |
2c2aba6c DM |
468 | } |
469 | ||
cd089336 | 470 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 471 | { |
cd089336 | 472 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 473 | struct neigh_hash_table *ret; |
6193d2be | 474 | struct neighbour __rcu **buckets; |
2c2aba6c | 475 | int i; |
1da177e4 | 476 | |
d6bf7817 ED |
477 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
478 | if (!ret) | |
479 | return NULL; | |
85704cb8 | 480 | if (size <= PAGE_SIZE) { |
d6bf7817 | 481 | buckets = kzalloc(size, GFP_ATOMIC); |
85704cb8 | 482 | } else { |
6193d2be | 483 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
484 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
485 | get_order(size)); | |
01b833ab | 486 | kmemleak_alloc(buckets, size, 1, GFP_ATOMIC); |
85704cb8 | 487 | } |
d6bf7817 ED |
488 | if (!buckets) { |
489 | kfree(ret); | |
490 | return NULL; | |
1da177e4 | 491 | } |
6193d2be | 492 | ret->hash_buckets = buckets; |
cd089336 | 493 | ret->hash_shift = shift; |
2c2aba6c DM |
494 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
495 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
496 | return ret; |
497 | } | |
498 | ||
d6bf7817 | 499 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 500 | { |
d6bf7817 ED |
501 | struct neigh_hash_table *nht = container_of(head, |
502 | struct neigh_hash_table, | |
503 | rcu); | |
cd089336 | 504 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 505 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 | 506 | |
85704cb8 | 507 | if (size <= PAGE_SIZE) { |
d6bf7817 | 508 | kfree(buckets); |
85704cb8 KK |
509 | } else { |
510 | kmemleak_free(buckets); | |
d6bf7817 | 511 | free_pages((unsigned long)buckets, get_order(size)); |
85704cb8 | 512 | } |
d6bf7817 | 513 | kfree(nht); |
1da177e4 LT |
514 | } |
515 | ||
d6bf7817 | 516 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 517 | unsigned long new_shift) |
1da177e4 | 518 | { |
d6bf7817 ED |
519 | unsigned int i, hash; |
520 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
521 | |
522 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
523 | ||
d6bf7817 ED |
524 | old_nht = rcu_dereference_protected(tbl->nht, |
525 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 526 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
527 | if (!new_nht) |
528 | return old_nht; | |
1da177e4 | 529 | |
cd089336 | 530 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
531 | struct neighbour *n, *next; |
532 | ||
767e97e1 ED |
533 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
534 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
535 | n != NULL; |
536 | n = next) { | |
537 | hash = tbl->hash(n->primary_key, n->dev, | |
538 | new_nht->hash_rnd); | |
1da177e4 | 539 | |
cd089336 | 540 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
541 | next = rcu_dereference_protected(n->next, |
542 | lockdep_is_held(&tbl->lock)); | |
543 | ||
544 | rcu_assign_pointer(n->next, | |
545 | rcu_dereference_protected( | |
546 | new_nht->hash_buckets[hash], | |
547 | lockdep_is_held(&tbl->lock))); | |
548 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
549 | } |
550 | } | |
1da177e4 | 551 | |
d6bf7817 ED |
552 | rcu_assign_pointer(tbl->nht, new_nht); |
553 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
554 | return new_nht; | |
1da177e4 LT |
555 | } |
556 | ||
557 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
558 | struct net_device *dev) | |
559 | { | |
560 | struct neighbour *n; | |
4ec93edb | 561 | |
1da177e4 LT |
562 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
563 | ||
d6bf7817 | 564 | rcu_read_lock_bh(); |
60395a20 EB |
565 | n = __neigh_lookup_noref(tbl, pkey, dev); |
566 | if (n) { | |
9f237430 | 567 | if (!refcount_inc_not_zero(&n->refcnt)) |
60395a20 EB |
568 | n = NULL; |
569 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 570 | } |
767e97e1 | 571 | |
d6bf7817 | 572 | rcu_read_unlock_bh(); |
1da177e4 LT |
573 | return n; |
574 | } | |
0a204500 | 575 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 576 | |
426b5303 EB |
577 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
578 | const void *pkey) | |
1da177e4 LT |
579 | { |
580 | struct neighbour *n; | |
01ccdf12 | 581 | unsigned int key_len = tbl->key_len; |
bc4bf5f3 | 582 | u32 hash_val; |
d6bf7817 | 583 | struct neigh_hash_table *nht; |
1da177e4 LT |
584 | |
585 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
586 | ||
d6bf7817 ED |
587 | rcu_read_lock_bh(); |
588 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 589 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
590 | |
591 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
592 | n != NULL; | |
593 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 594 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 595 | net_eq(dev_net(n->dev), net)) { |
9f237430 | 596 | if (!refcount_inc_not_zero(&n->refcnt)) |
767e97e1 | 597 | n = NULL; |
1da177e4 LT |
598 | NEIGH_CACHE_STAT_INC(tbl, hits); |
599 | break; | |
600 | } | |
601 | } | |
767e97e1 | 602 | |
d6bf7817 | 603 | rcu_read_unlock_bh(); |
1da177e4 LT |
604 | return n; |
605 | } | |
0a204500 | 606 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 607 | |
e4400bbf DB |
608 | static struct neighbour * |
609 | ___neigh_create(struct neigh_table *tbl, const void *pkey, | |
2c611ad9 | 610 | struct net_device *dev, u32 flags, |
e4400bbf | 611 | bool exempt_from_gc, bool want_ref) |
1da177e4 | 612 | { |
e4400bbf DB |
613 | u32 hash_val, key_len = tbl->key_len; |
614 | struct neighbour *n1, *rc, *n; | |
d6bf7817 | 615 | struct neigh_hash_table *nht; |
e4400bbf | 616 | int error; |
1da177e4 | 617 | |
e4400bbf | 618 | n = neigh_alloc(tbl, dev, flags, exempt_from_gc); |
fc651001 | 619 | trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc); |
1da177e4 LT |
620 | if (!n) { |
621 | rc = ERR_PTR(-ENOBUFS); | |
622 | goto out; | |
623 | } | |
624 | ||
625 | memcpy(n->primary_key, pkey, key_len); | |
626 | n->dev = dev; | |
d62607c3 | 627 | netdev_hold(dev, &n->dev_tracker, GFP_ATOMIC); |
1da177e4 LT |
628 | |
629 | /* Protocol specific setup. */ | |
630 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
631 | rc = ERR_PTR(error); | |
632 | goto out_neigh_release; | |
633 | } | |
634 | ||
da6a8fa0 | 635 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 636 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
637 | if (error < 0) { |
638 | rc = ERR_PTR(error); | |
639 | goto out_neigh_release; | |
640 | } | |
641 | } | |
642 | ||
447f2191 DM |
643 | /* Device specific setup. */ |
644 | if (n->parms->neigh_setup && | |
645 | (error = n->parms->neigh_setup(n)) < 0) { | |
646 | rc = ERR_PTR(error); | |
647 | goto out_neigh_release; | |
648 | } | |
649 | ||
1f9248e5 | 650 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
651 | |
652 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
653 | nht = rcu_dereference_protected(tbl->nht, |
654 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 655 | |
cd089336 DM |
656 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
657 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 658 | |
096b9854 | 659 | hash_val = tbl->hash(n->primary_key, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
660 | |
661 | if (n->parms->dead) { | |
662 | rc = ERR_PTR(-EINVAL); | |
663 | goto out_tbl_unlock; | |
664 | } | |
665 | ||
767e97e1 ED |
666 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
667 | lockdep_is_held(&tbl->lock)); | |
668 | n1 != NULL; | |
669 | n1 = rcu_dereference_protected(n1->next, | |
670 | lockdep_is_held(&tbl->lock))) { | |
096b9854 | 671 | if (dev == n1->dev && !memcmp(n1->primary_key, n->primary_key, key_len)) { |
a263b309 DM |
672 | if (want_ref) |
673 | neigh_hold(n1); | |
1da177e4 LT |
674 | rc = n1; |
675 | goto out_tbl_unlock; | |
676 | } | |
677 | } | |
678 | ||
1da177e4 | 679 | n->dead = 0; |
e997f8a2 | 680 | if (!exempt_from_gc) |
8cc196d6 | 681 | list_add_tail(&n->gc_list, &n->tbl->gc_list); |
7482e384 DB |
682 | if (n->flags & NTF_MANAGED) |
683 | list_add_tail(&n->managed_list, &n->tbl->managed_list); | |
a263b309 DM |
684 | if (want_ref) |
685 | neigh_hold(n); | |
767e97e1 ED |
686 | rcu_assign_pointer(n->next, |
687 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
688 | lockdep_is_held(&tbl->lock))); | |
689 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 690 | write_unlock_bh(&tbl->lock); |
d5d427cd | 691 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
692 | rc = n; |
693 | out: | |
694 | return rc; | |
695 | out_tbl_unlock: | |
696 | write_unlock_bh(&tbl->lock); | |
697 | out_neigh_release: | |
64c6f4bb DA |
698 | if (!exempt_from_gc) |
699 | atomic_dec(&tbl->gc_entries); | |
1da177e4 LT |
700 | neigh_release(n); |
701 | goto out; | |
702 | } | |
58956317 DA |
703 | |
704 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
705 | struct net_device *dev, bool want_ref) | |
706 | { | |
e4400bbf | 707 | return ___neigh_create(tbl, pkey, dev, 0, false, want_ref); |
58956317 | 708 | } |
a263b309 | 709 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 710 | |
01ccdf12 | 711 | static u32 pneigh_hash(const void *pkey, unsigned int key_len) |
fa86d322 | 712 | { |
fa86d322 | 713 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
714 | hash_val ^= (hash_val >> 16); |
715 | hash_val ^= hash_val >> 8; | |
716 | hash_val ^= hash_val >> 4; | |
717 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
718 | return hash_val; |
719 | } | |
fa86d322 | 720 | |
be01d655 YH |
721 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
722 | struct net *net, | |
723 | const void *pkey, | |
01ccdf12 | 724 | unsigned int key_len, |
be01d655 YH |
725 | struct net_device *dev) |
726 | { | |
727 | while (n) { | |
fa86d322 | 728 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 729 | net_eq(pneigh_net(n), net) && |
fa86d322 | 730 | (n->dev == dev || !n->dev)) |
be01d655 YH |
731 | return n; |
732 | n = n->next; | |
fa86d322 | 733 | } |
be01d655 YH |
734 | return NULL; |
735 | } | |
fa86d322 | 736 | |
be01d655 YH |
737 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
738 | struct net *net, const void *pkey, struct net_device *dev) | |
739 | { | |
01ccdf12 | 740 | unsigned int key_len = tbl->key_len; |
be01d655 YH |
741 | u32 hash_val = pneigh_hash(pkey, key_len); |
742 | ||
743 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
744 | net, pkey, key_len, dev); | |
fa86d322 | 745 | } |
0a204500 | 746 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 747 | |
426b5303 EB |
748 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
749 | struct net *net, const void *pkey, | |
1da177e4 LT |
750 | struct net_device *dev, int creat) |
751 | { | |
752 | struct pneigh_entry *n; | |
01ccdf12 | 753 | unsigned int key_len = tbl->key_len; |
be01d655 | 754 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
755 | |
756 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
757 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
758 | net, pkey, key_len, dev); | |
1da177e4 | 759 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
760 | |
761 | if (n || !creat) | |
1da177e4 LT |
762 | goto out; |
763 | ||
4ae28944 PE |
764 | ASSERT_RTNL(); |
765 | ||
e195e9b5 | 766 | n = kzalloc(sizeof(*n) + key_len, GFP_KERNEL); |
1da177e4 LT |
767 | if (!n) |
768 | goto out; | |
769 | ||
efd7ef1c | 770 | write_pnet(&n->net, net); |
1da177e4 LT |
771 | memcpy(n->key, pkey, key_len); |
772 | n->dev = dev; | |
d62607c3 | 773 | netdev_hold(dev, &n->dev_tracker, GFP_KERNEL); |
1da177e4 LT |
774 | |
775 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
d62607c3 | 776 | netdev_put(dev, &n->dev_tracker); |
1da177e4 LT |
777 | kfree(n); |
778 | n = NULL; | |
779 | goto out; | |
780 | } | |
781 | ||
782 | write_lock_bh(&tbl->lock); | |
783 | n->next = tbl->phash_buckets[hash_val]; | |
784 | tbl->phash_buckets[hash_val] = n; | |
785 | write_unlock_bh(&tbl->lock); | |
786 | out: | |
787 | return n; | |
788 | } | |
0a204500 | 789 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
790 | |
791 | ||
426b5303 | 792 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
793 | struct net_device *dev) |
794 | { | |
795 | struct pneigh_entry *n, **np; | |
01ccdf12 | 796 | unsigned int key_len = tbl->key_len; |
be01d655 | 797 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
798 | |
799 | write_lock_bh(&tbl->lock); | |
800 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
801 | np = &n->next) { | |
426b5303 | 802 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 803 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
804 | *np = n->next; |
805 | write_unlock_bh(&tbl->lock); | |
806 | if (tbl->pdestructor) | |
807 | tbl->pdestructor(n); | |
d62607c3 | 808 | netdev_put(n->dev, &n->dev_tracker); |
1da177e4 LT |
809 | kfree(n); |
810 | return 0; | |
811 | } | |
812 | } | |
813 | write_unlock_bh(&tbl->lock); | |
814 | return -ENOENT; | |
815 | } | |
816 | ||
53b76cdf WB |
817 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
818 | struct net_device *dev) | |
1da177e4 | 819 | { |
53b76cdf | 820 | struct pneigh_entry *n, **np, *freelist = NULL; |
1da177e4 LT |
821 | u32 h; |
822 | ||
823 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
824 | np = &tbl->phash_buckets[h]; | |
825 | while ((n = *np) != NULL) { | |
826 | if (!dev || n->dev == dev) { | |
827 | *np = n->next; | |
53b76cdf WB |
828 | n->next = freelist; |
829 | freelist = n; | |
1da177e4 LT |
830 | continue; |
831 | } | |
832 | np = &n->next; | |
833 | } | |
834 | } | |
53b76cdf WB |
835 | write_unlock_bh(&tbl->lock); |
836 | while ((n = freelist)) { | |
837 | freelist = n->next; | |
838 | n->next = NULL; | |
839 | if (tbl->pdestructor) | |
840 | tbl->pdestructor(n); | |
d62607c3 | 841 | netdev_put(n->dev, &n->dev_tracker); |
53b76cdf WB |
842 | kfree(n); |
843 | } | |
1da177e4 LT |
844 | return -ENOENT; |
845 | } | |
846 | ||
06f0511d DL |
847 | static void neigh_parms_destroy(struct neigh_parms *parms); |
848 | ||
849 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
850 | { | |
6343944b | 851 | if (refcount_dec_and_test(&parms->refcnt)) |
06f0511d DL |
852 | neigh_parms_destroy(parms); |
853 | } | |
1da177e4 LT |
854 | |
855 | /* | |
856 | * neighbour must already be out of the table; | |
857 | * | |
858 | */ | |
859 | void neigh_destroy(struct neighbour *neigh) | |
860 | { | |
da6a8fa0 DM |
861 | struct net_device *dev = neigh->dev; |
862 | ||
1da177e4 LT |
863 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
864 | ||
865 | if (!neigh->dead) { | |
e005d193 | 866 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
867 | dump_stack(); |
868 | return; | |
869 | } | |
870 | ||
871 | if (neigh_del_timer(neigh)) | |
e005d193 | 872 | pr_warn("Impossible event\n"); |
1da177e4 | 873 | |
c9ab4d85 ED |
874 | write_lock_bh(&neigh->lock); |
875 | __skb_queue_purge(&neigh->arp_queue); | |
876 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 877 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 878 | |
447f2191 | 879 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 880 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 881 | |
d62607c3 | 882 | netdev_put(dev, &neigh->dev_tracker); |
1da177e4 LT |
883 | neigh_parms_put(neigh->parms); |
884 | ||
d5d427cd | 885 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
886 | |
887 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 888 | kfree_rcu(neigh, rcu); |
1da177e4 | 889 | } |
0a204500 | 890 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
891 | |
892 | /* Neighbour state is suspicious; | |
893 | disable fast path. | |
894 | ||
895 | Called with write_locked neigh. | |
896 | */ | |
897 | static void neigh_suspect(struct neighbour *neigh) | |
898 | { | |
d5d427cd | 899 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
900 | |
901 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
902 | } |
903 | ||
904 | /* Neighbour state is OK; | |
905 | enable fast path. | |
906 | ||
907 | Called with write_locked neigh. | |
908 | */ | |
909 | static void neigh_connect(struct neighbour *neigh) | |
910 | { | |
d5d427cd | 911 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
912 | |
913 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
914 | } |
915 | ||
e4c4e448 | 916 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 917 | { |
e4c4e448 | 918 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
919 | struct neighbour *n; |
920 | struct neighbour __rcu **np; | |
e4c4e448 | 921 | unsigned int i; |
d6bf7817 | 922 | struct neigh_hash_table *nht; |
1da177e4 LT |
923 | |
924 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
925 | ||
e4c4e448 | 926 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
927 | nht = rcu_dereference_protected(tbl->nht, |
928 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
929 | |
930 | /* | |
931 | * periodically recompute ReachableTime from random function | |
932 | */ | |
933 | ||
e4c4e448 | 934 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 935 | struct neigh_parms *p; |
e4c4e448 | 936 | tbl->last_rand = jiffies; |
75fbfd33 | 937 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 938 | p->reachable_time = |
1f9248e5 | 939 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
940 | } |
941 | ||
feff9ab2 DJ |
942 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
943 | goto out; | |
944 | ||
cd089336 | 945 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 946 | np = &nht->hash_buckets[i]; |
1da177e4 | 947 | |
767e97e1 ED |
948 | while ((n = rcu_dereference_protected(*np, |
949 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 950 | unsigned int state; |
1da177e4 | 951 | |
e4c4e448 | 952 | write_lock(&n->lock); |
1da177e4 | 953 | |
e4c4e448 | 954 | state = n->nud_state; |
9ce33e46 RP |
955 | if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) || |
956 | (n->flags & NTF_EXT_LEARNED)) { | |
e4c4e448 ED |
957 | write_unlock(&n->lock); |
958 | goto next_elt; | |
959 | } | |
1da177e4 | 960 | |
e4c4e448 ED |
961 | if (time_before(n->used, n->confirmed)) |
962 | n->used = n->confirmed; | |
1da177e4 | 963 | |
9f237430 | 964 | if (refcount_read(&n->refcnt) == 1 && |
e4c4e448 | 965 | (state == NUD_FAILED || |
1f9248e5 | 966 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 | 967 | *np = n->next; |
58956317 | 968 | neigh_mark_dead(n); |
e4c4e448 ED |
969 | write_unlock(&n->lock); |
970 | neigh_cleanup_and_release(n); | |
971 | continue; | |
972 | } | |
1da177e4 | 973 | write_unlock(&n->lock); |
1da177e4 LT |
974 | |
975 | next_elt: | |
e4c4e448 ED |
976 | np = &n->next; |
977 | } | |
978 | /* | |
979 | * It's fine to release lock here, even if hash table | |
980 | * grows while we are preempted. | |
981 | */ | |
982 | write_unlock_bh(&tbl->lock); | |
983 | cond_resched(); | |
984 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
985 | nht = rcu_dereference_protected(tbl->nht, |
986 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 987 | } |
2724680b | 988 | out: |
1f9248e5 JP |
989 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
990 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
991 | * BASE_REACHABLE_TIME. | |
1da177e4 | 992 | */ |
f618002b | 993 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 994 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 995 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
996 | } |
997 | ||
998 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
999 | { | |
1000 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
1001 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
1002 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
1003 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
1004 | } |
1005 | ||
5ef12d98 | 1006 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
1007 | __releases(neigh->lock) |
1008 | __acquires(neigh->lock) | |
5ef12d98 TT |
1009 | { |
1010 | struct sk_buff *skb; | |
1011 | ||
1012 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 1013 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
1014 | neigh->updated = jiffies; |
1015 | ||
1016 | /* It is very thin place. report_unreachable is very complicated | |
1017 | routine. Particularly, it can hit the same neighbour entry! | |
1018 | ||
1019 | So that, we try to be accurate and avoid dead loop. --ANK | |
1020 | */ | |
1021 | while (neigh->nud_state == NUD_FAILED && | |
1022 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
1023 | write_unlock(&neigh->lock); | |
1024 | neigh->ops->error_report(neigh, skb); | |
1025 | write_lock(&neigh->lock); | |
1026 | } | |
c9ab4d85 | 1027 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1028 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
1029 | } |
1030 | ||
cd28ca0a ED |
1031 | static void neigh_probe(struct neighbour *neigh) |
1032 | __releases(neigh->lock) | |
1033 | { | |
4ed377e3 | 1034 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
1035 | /* keep skb alive even if arp_queue overflows */ |
1036 | if (skb) | |
19125c1a | 1037 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a | 1038 | write_unlock(&neigh->lock); |
48481c8f ED |
1039 | if (neigh->ops->solicit) |
1040 | neigh->ops->solicit(neigh, skb); | |
cd28ca0a | 1041 | atomic_inc(&neigh->probes); |
87fff3ca | 1042 | consume_skb(skb); |
cd28ca0a ED |
1043 | } |
1044 | ||
1da177e4 LT |
1045 | /* Called when a timer expires for a neighbour entry. */ |
1046 | ||
e99e88a9 | 1047 | static void neigh_timer_handler(struct timer_list *t) |
1da177e4 LT |
1048 | { |
1049 | unsigned long now, next; | |
e99e88a9 | 1050 | struct neighbour *neigh = from_timer(neigh, t, timer); |
95c96174 | 1051 | unsigned int state; |
1da177e4 LT |
1052 | int notify = 0; |
1053 | ||
1054 | write_lock(&neigh->lock); | |
1055 | ||
1056 | state = neigh->nud_state; | |
1057 | now = jiffies; | |
1058 | next = now + HZ; | |
1059 | ||
045f7b3b | 1060 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 1061 | goto out; |
1da177e4 LT |
1062 | |
1063 | if (state & NUD_REACHABLE) { | |
4ec93edb | 1064 | if (time_before_eq(now, |
1da177e4 | 1065 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 1066 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
1067 | next = neigh->confirmed + neigh->parms->reachable_time; |
1068 | } else if (time_before_eq(now, | |
1f9248e5 JP |
1069 | neigh->used + |
1070 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1071 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 1072 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1073 | neigh->updated = jiffies; |
1da177e4 | 1074 | neigh_suspect(neigh); |
1f9248e5 | 1075 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 1076 | } else { |
d5d427cd | 1077 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 1078 | neigh->nud_state = NUD_STALE; |
955aaa2f | 1079 | neigh->updated = jiffies; |
1da177e4 | 1080 | neigh_suspect(neigh); |
8d71740c | 1081 | notify = 1; |
1da177e4 LT |
1082 | } |
1083 | } else if (state & NUD_DELAY) { | |
4ec93edb | 1084 | if (time_before_eq(now, |
1f9248e5 JP |
1085 | neigh->confirmed + |
1086 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1087 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 1088 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 1089 | neigh->updated = jiffies; |
1da177e4 | 1090 | neigh_connect(neigh); |
8d71740c | 1091 | notify = 1; |
1da177e4 LT |
1092 | next = neigh->confirmed + neigh->parms->reachable_time; |
1093 | } else { | |
d5d427cd | 1094 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 1095 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 1096 | neigh->updated = jiffies; |
1da177e4 | 1097 | atomic_set(&neigh->probes, 0); |
765c9c63 | 1098 | notify = 1; |
19e16d22 HL |
1099 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1100 | HZ/100); | |
1da177e4 LT |
1101 | } |
1102 | } else { | |
1103 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
19e16d22 | 1104 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), HZ/100); |
1da177e4 LT |
1105 | } |
1106 | ||
1107 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
1108 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
1109 | neigh->nud_state = NUD_FAILED; |
1110 | notify = 1; | |
5ef12d98 | 1111 | neigh_invalidate(neigh); |
5e2c21dc | 1112 | goto out; |
1da177e4 LT |
1113 | } |
1114 | ||
1115 | if (neigh->nud_state & NUD_IN_TIMER) { | |
96d10d5b HL |
1116 | if (time_before(next, jiffies + HZ/100)) |
1117 | next = jiffies + HZ/100; | |
6fb9974f HX |
1118 | if (!mod_timer(&neigh->timer, next)) |
1119 | neigh_hold(neigh); | |
1da177e4 LT |
1120 | } |
1121 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 1122 | neigh_probe(neigh); |
9ff56607 | 1123 | } else { |
69cc64d8 | 1124 | out: |
9ff56607 DM |
1125 | write_unlock(&neigh->lock); |
1126 | } | |
d961db35 | 1127 | |
8d71740c | 1128 | if (notify) |
7b8f7a40 | 1129 | neigh_update_notify(neigh, 0); |
1da177e4 | 1130 | |
56dd18a4 RP |
1131 | trace_neigh_timer_handler(neigh, 0); |
1132 | ||
1da177e4 LT |
1133 | neigh_release(neigh); |
1134 | } | |
1135 | ||
4a81f6da DB |
1136 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb, |
1137 | const bool immediate_ok) | |
1da177e4 LT |
1138 | { |
1139 | int rc; | |
cd28ca0a | 1140 | bool immediate_probe = false; |
1da177e4 LT |
1141 | |
1142 | write_lock_bh(&neigh->lock); | |
1143 | ||
1144 | rc = 0; | |
1145 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
1146 | goto out_unlock_bh; | |
2c51a97f JA |
1147 | if (neigh->dead) |
1148 | goto out_dead; | |
1da177e4 | 1149 | |
1da177e4 | 1150 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
1151 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
1152 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
1153 | unsigned long next, now = jiffies; |
1154 | ||
1f9248e5 JP |
1155 | atomic_set(&neigh->probes, |
1156 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
071c3798 | 1157 | neigh_del_timer(neigh); |
4a81f6da | 1158 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 1159 | neigh->updated = now; |
4a81f6da DB |
1160 | if (!immediate_ok) { |
1161 | next = now + 1; | |
1162 | } else { | |
1163 | immediate_probe = true; | |
1164 | next = now + max(NEIGH_VAR(neigh->parms, | |
1165 | RETRANS_TIME), | |
1166 | HZ / 100); | |
1167 | } | |
cd28ca0a | 1168 | neigh_add_timer(neigh, next); |
1da177e4 LT |
1169 | } else { |
1170 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 1171 | neigh->updated = jiffies; |
1da177e4 LT |
1172 | write_unlock_bh(&neigh->lock); |
1173 | ||
a5736edd | 1174 | kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_FAILED); |
1da177e4 LT |
1175 | return 1; |
1176 | } | |
1177 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 1178 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
071c3798 | 1179 | neigh_del_timer(neigh); |
1da177e4 | 1180 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1181 | neigh->updated = jiffies; |
1f9248e5 JP |
1182 | neigh_add_timer(neigh, jiffies + |
1183 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
1187 | if (skb) { | |
8b5c171b | 1188 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1189 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1190 | struct sk_buff *buff; |
8b5c171b | 1191 | |
f72051b0 | 1192 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1193 | if (!buff) |
1194 | break; | |
1195 | neigh->arp_queue_len_bytes -= buff->truesize; | |
a5736edd | 1196 | kfree_skb_reason(buff, SKB_DROP_REASON_NEIGH_QUEUEFULL); |
9a6d276e | 1197 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1198 | } |
a4731138 | 1199 | skb_dst_force(skb); |
1da177e4 | 1200 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1201 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1202 | } |
1203 | rc = 1; | |
1204 | } | |
1205 | out_unlock_bh: | |
cd28ca0a ED |
1206 | if (immediate_probe) |
1207 | neigh_probe(neigh); | |
1208 | else | |
1209 | write_unlock(&neigh->lock); | |
1210 | local_bh_enable(); | |
56dd18a4 | 1211 | trace_neigh_event_send_done(neigh, rc); |
1da177e4 | 1212 | return rc; |
2c51a97f JA |
1213 | |
1214 | out_dead: | |
1215 | if (neigh->nud_state & NUD_STALE) | |
1216 | goto out_unlock_bh; | |
1217 | write_unlock_bh(&neigh->lock); | |
a5736edd | 1218 | kfree_skb_reason(skb, SKB_DROP_REASON_NEIGH_DEAD); |
56dd18a4 | 1219 | trace_neigh_event_send_dead(neigh, 1); |
2c51a97f | 1220 | return 1; |
1da177e4 | 1221 | } |
0a204500 | 1222 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1223 | |
f6b72b62 | 1224 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1225 | { |
1226 | struct hh_cache *hh; | |
3b04ddde | 1227 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1228 | = NULL; |
1229 | ||
1230 | if (neigh->dev->header_ops) | |
1231 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1232 | |
1233 | if (update) { | |
f6b72b62 | 1234 | hh = &neigh->hh; |
c305c6ae | 1235 | if (READ_ONCE(hh->hh_len)) { |
3644f0ce | 1236 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1237 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1238 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1239 | } |
1240 | } | |
1241 | } | |
1242 | ||
1da177e4 LT |
1243 | /* Generic update routine. |
1244 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1245 | -- new is new state. | |
1246 | -- flags | |
1247 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1248 | if it is different. | |
1249 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1250 | lladdr instead of overriding it |
1da177e4 | 1251 | if it is different. |
1da177e4 | 1252 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
3dc20f47 | 1253 | NEIGH_UPDATE_F_USE means that the entry is user triggered. |
7482e384 | 1254 | NEIGH_UPDATE_F_MANAGED means that the entry will be auto-refreshed. |
4ec93edb | 1255 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1256 | NTF_ROUTER flag. |
1257 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1258 | a router. | |
1259 | ||
1260 | Caller MUST hold reference count on the entry. | |
1261 | */ | |
7a35a50d DA |
1262 | static int __neigh_update(struct neighbour *neigh, const u8 *lladdr, |
1263 | u8 new, u32 flags, u32 nlmsg_pid, | |
1264 | struct netlink_ext_ack *extack) | |
1da177e4 | 1265 | { |
7482e384 | 1266 | bool gc_update = false, managed_update = false; |
1da177e4 | 1267 | int update_isrouter = 0; |
7482e384 DB |
1268 | struct net_device *dev; |
1269 | int err, notify = 0; | |
1270 | u8 old; | |
1da177e4 | 1271 | |
56dd18a4 RP |
1272 | trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid); |
1273 | ||
1da177e4 LT |
1274 | write_lock_bh(&neigh->lock); |
1275 | ||
1276 | dev = neigh->dev; | |
1277 | old = neigh->nud_state; | |
1278 | err = -EPERM; | |
1279 | ||
7a35a50d DA |
1280 | if (neigh->dead) { |
1281 | NL_SET_ERR_MSG(extack, "Neighbor entry is now dead"); | |
eb4e8fac | 1282 | new = old; |
2c51a97f | 1283 | goto out; |
7a35a50d | 1284 | } |
eb4e8fac CA |
1285 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1286 | (old & (NUD_NOARP | NUD_PERMANENT))) | |
1287 | goto out; | |
1da177e4 | 1288 | |
7482e384 DB |
1289 | neigh_update_flags(neigh, flags, ¬ify, &gc_update, &managed_update); |
1290 | if (flags & (NEIGH_UPDATE_F_USE | NEIGH_UPDATE_F_MANAGED)) { | |
3dc20f47 DB |
1291 | new = old & ~NUD_PERMANENT; |
1292 | neigh->nud_state = new; | |
1293 | err = 0; | |
1294 | goto out; | |
1295 | } | |
9ce33e46 | 1296 | |
1da177e4 LT |
1297 | if (!(new & NUD_VALID)) { |
1298 | neigh_del_timer(neigh); | |
1299 | if (old & NUD_CONNECTED) | |
1300 | neigh_suspect(neigh); | |
9c29a2f5 | 1301 | neigh->nud_state = new; |
1da177e4 | 1302 | err = 0; |
1da177e4 | 1303 | notify = old & NUD_VALID; |
d2fb4fb8 | 1304 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
5ef12d98 TT |
1305 | (new & NUD_FAILED)) { |
1306 | neigh_invalidate(neigh); | |
1307 | notify = 1; | |
1308 | } | |
1da177e4 LT |
1309 | goto out; |
1310 | } | |
1311 | ||
1312 | /* Compare new lladdr with cached one */ | |
1313 | if (!dev->addr_len) { | |
1314 | /* First case: device needs no address. */ | |
1315 | lladdr = neigh->ha; | |
1316 | } else if (lladdr) { | |
1317 | /* The second case: if something is already cached | |
1318 | and a new address is proposed: | |
1319 | - compare new & old | |
1320 | - if they are different, check override flag | |
1321 | */ | |
4ec93edb | 1322 | if ((old & NUD_VALID) && |
1da177e4 LT |
1323 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1324 | lladdr = neigh->ha; | |
1325 | } else { | |
1326 | /* No address is supplied; if we know something, | |
1327 | use it, otherwise discard the request. | |
1328 | */ | |
1329 | err = -EINVAL; | |
7a35a50d DA |
1330 | if (!(old & NUD_VALID)) { |
1331 | NL_SET_ERR_MSG(extack, "No link layer address given"); | |
1da177e4 | 1332 | goto out; |
7a35a50d | 1333 | } |
1da177e4 LT |
1334 | lladdr = neigh->ha; |
1335 | } | |
1336 | ||
f0e0d044 VK |
1337 | /* Update confirmed timestamp for neighbour entry after we |
1338 | * received ARP packet even if it doesn't change IP to MAC binding. | |
1339 | */ | |
1340 | if (new & NUD_CONNECTED) | |
1341 | neigh->confirmed = jiffies; | |
1342 | ||
1da177e4 LT |
1343 | /* If entry was valid and address is not changed, |
1344 | do not change entry state, if new one is STALE. | |
1345 | */ | |
1346 | err = 0; | |
1347 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1348 | if (old & NUD_VALID) { | |
1349 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1350 | update_isrouter = 0; | |
1351 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1352 | (old & NUD_CONNECTED)) { | |
1353 | lladdr = neigh->ha; | |
1354 | new = NUD_STALE; | |
1355 | } else | |
1356 | goto out; | |
1357 | } else { | |
0e7bbcc1 JA |
1358 | if (lladdr == neigh->ha && new == NUD_STALE && |
1359 | !(flags & NEIGH_UPDATE_F_ADMIN)) | |
1da177e4 LT |
1360 | new = old; |
1361 | } | |
1362 | } | |
1363 | ||
f0e0d044 | 1364 | /* Update timestamp only once we know we will make a change to the |
77d71233 IH |
1365 | * neighbour entry. Otherwise we risk to move the locktime window with |
1366 | * noop updates and ignore relevant ARP updates. | |
1367 | */ | |
f0e0d044 | 1368 | if (new != old || lladdr != neigh->ha) |
77d71233 | 1369 | neigh->updated = jiffies; |
77d71233 | 1370 | |
1da177e4 LT |
1371 | if (new != old) { |
1372 | neigh_del_timer(neigh); | |
765c9c63 EK |
1373 | if (new & NUD_PROBE) |
1374 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1375 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1376 | neigh_add_timer(neigh, (jiffies + |
1377 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1378 | neigh->parms->reachable_time : |
1379 | 0))); | |
9c29a2f5 | 1380 | neigh->nud_state = new; |
53385d2d | 1381 | notify = 1; |
1da177e4 LT |
1382 | } |
1383 | ||
1384 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1385 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1386 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1387 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1388 | neigh_update_hhs(neigh); |
1389 | if (!(new & NUD_CONNECTED)) | |
1390 | neigh->confirmed = jiffies - | |
1f9248e5 | 1391 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1392 | notify = 1; |
1da177e4 LT |
1393 | } |
1394 | if (new == old) | |
1395 | goto out; | |
1396 | if (new & NUD_CONNECTED) | |
1397 | neigh_connect(neigh); | |
1398 | else | |
1399 | neigh_suspect(neigh); | |
1400 | if (!(old & NUD_VALID)) { | |
1401 | struct sk_buff *skb; | |
1402 | ||
1403 | /* Again: avoid dead loop if something went wrong */ | |
1404 | ||
1405 | while (neigh->nud_state & NUD_VALID && | |
1406 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1407 | struct dst_entry *dst = skb_dst(skb); |
1408 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1409 | write_unlock_bh(&neigh->lock); |
e049f288 | 1410 | |
1411 | rcu_read_lock(); | |
13a43d94 DM |
1412 | |
1413 | /* Why not just use 'neigh' as-is? The problem is that | |
1414 | * things such as shaper, eql, and sch_teql can end up | |
1415 | * using alternative, different, neigh objects to output | |
1416 | * the packet in the output path. So what we need to do | |
1417 | * here is re-lookup the top-level neigh in the path so | |
1418 | * we can reinject the packet there. | |
1419 | */ | |
1420 | n2 = NULL; | |
d47ec7a0 | 1421 | if (dst && dst->obsolete != DST_OBSOLETE_DEAD) { |
13a43d94 DM |
1422 | n2 = dst_neigh_lookup_skb(dst, skb); |
1423 | if (n2) | |
1424 | n1 = n2; | |
1425 | } | |
8f40b161 | 1426 | n1->output(n1, skb); |
13a43d94 DM |
1427 | if (n2) |
1428 | neigh_release(n2); | |
e049f288 | 1429 | rcu_read_unlock(); |
1430 | ||
1da177e4 LT |
1431 | write_lock_bh(&neigh->lock); |
1432 | } | |
c9ab4d85 | 1433 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1434 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1435 | } |
1436 | out: | |
fc6e8073 RP |
1437 | if (update_isrouter) |
1438 | neigh_update_is_router(neigh, flags, ¬ify); | |
1da177e4 | 1439 | write_unlock_bh(&neigh->lock); |
7482e384 | 1440 | if (((new ^ old) & NUD_PERMANENT) || gc_update) |
9c29a2f5 | 1441 | neigh_update_gc_list(neigh); |
7482e384 DB |
1442 | if (managed_update) |
1443 | neigh_update_managed_list(neigh); | |
8d71740c | 1444 | if (notify) |
7b8f7a40 | 1445 | neigh_update_notify(neigh, nlmsg_pid); |
56dd18a4 | 1446 | trace_neigh_update_done(neigh, err); |
1da177e4 LT |
1447 | return err; |
1448 | } | |
7a35a50d DA |
1449 | |
1450 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1451 | u32 flags, u32 nlmsg_pid) | |
1452 | { | |
1453 | return __neigh_update(neigh, lladdr, new, flags, nlmsg_pid, NULL); | |
1454 | } | |
0a204500 | 1455 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1456 | |
7e980569 JB |
1457 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1458 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1459 | */ | |
1460 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1461 | { | |
2c51a97f JA |
1462 | if (neigh->dead) |
1463 | return; | |
7e980569 JB |
1464 | neigh->updated = jiffies; |
1465 | if (!(neigh->nud_state & NUD_FAILED)) | |
1466 | return; | |
2176d5d4 DJ |
1467 | neigh->nud_state = NUD_INCOMPLETE; |
1468 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 | 1469 | neigh_add_timer(neigh, |
19e16d22 HL |
1470 | jiffies + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1471 | HZ/100)); | |
7e980569 JB |
1472 | } |
1473 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1474 | ||
1da177e4 LT |
1475 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1476 | u8 *lladdr, void *saddr, | |
1477 | struct net_device *dev) | |
1478 | { | |
1479 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1480 | lladdr || !dev->addr_len); | |
1481 | if (neigh) | |
4ec93edb | 1482 | neigh_update(neigh, lladdr, NUD_STALE, |
7b8f7a40 | 1483 | NEIGH_UPDATE_F_OVERRIDE, 0); |
1da177e4 LT |
1484 | return neigh; |
1485 | } | |
0a204500 | 1486 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1487 | |
34d101dd | 1488 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1489 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1490 | { |
bdf53c58 EB |
1491 | struct net_device *dev = n->dev; |
1492 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1493 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1494 | |
1495 | write_lock_bh(&n->lock); | |
34d101dd | 1496 | |
f6b72b62 DM |
1497 | /* Only one thread can come in here and initialize the |
1498 | * hh_cache entry. | |
1499 | */ | |
b23b5455 DM |
1500 | if (!hh->hh_len) |
1501 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1502 | |
0ed8ddf4 | 1503 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1504 | } |
1505 | ||
1da177e4 LT |
1506 | /* Slow and careful. */ |
1507 | ||
8f40b161 | 1508 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1509 | { |
1da177e4 LT |
1510 | int rc = 0; |
1511 | ||
1da177e4 LT |
1512 | if (!neigh_event_send(neigh, skb)) { |
1513 | int err; | |
1514 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1515 | unsigned int seq; |
34d101dd | 1516 | |
c305c6ae | 1517 | if (dev->header_ops->cache && !READ_ONCE(neigh->hh.hh_len)) |
bdf53c58 | 1518 | neigh_hh_init(neigh); |
34d101dd | 1519 | |
0ed8ddf4 | 1520 | do { |
e1f16503 | 1521 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1522 | seq = read_seqbegin(&neigh->ha_lock); |
1523 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1524 | neigh->ha, NULL, skb->len); | |
1525 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1526 | |
1da177e4 | 1527 | if (err >= 0) |
542d4d68 | 1528 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1529 | else |
1530 | goto out_kfree_skb; | |
1531 | } | |
1532 | out: | |
1533 | return rc; | |
1da177e4 LT |
1534 | out_kfree_skb: |
1535 | rc = -EINVAL; | |
1536 | kfree_skb(skb); | |
1537 | goto out; | |
1538 | } | |
0a204500 | 1539 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1540 | |
1541 | /* As fast as possible without hh cache */ | |
1542 | ||
8f40b161 | 1543 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1544 | { |
1da177e4 | 1545 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1546 | unsigned int seq; |
8f40b161 | 1547 | int err; |
1da177e4 | 1548 | |
0ed8ddf4 | 1549 | do { |
e1f16503 | 1550 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1551 | seq = read_seqbegin(&neigh->ha_lock); |
1552 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1553 | neigh->ha, NULL, skb->len); | |
1554 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1555 | ||
1da177e4 | 1556 | if (err >= 0) |
542d4d68 | 1557 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1558 | else { |
1559 | err = -EINVAL; | |
1560 | kfree_skb(skb); | |
1561 | } | |
1562 | return err; | |
1563 | } | |
0a204500 | 1564 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1565 | |
8f40b161 DM |
1566 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1567 | { | |
1568 | return dev_queue_xmit(skb); | |
1569 | } | |
1570 | EXPORT_SYMBOL(neigh_direct_output); | |
1571 | ||
7482e384 DB |
1572 | static void neigh_managed_work(struct work_struct *work) |
1573 | { | |
1574 | struct neigh_table *tbl = container_of(work, struct neigh_table, | |
1575 | managed_work.work); | |
1576 | struct neighbour *neigh; | |
1577 | ||
1578 | write_lock_bh(&tbl->lock); | |
1579 | list_for_each_entry(neigh, &tbl->managed_list, managed_list) | |
4a81f6da | 1580 | neigh_event_send_probe(neigh, NULL, false); |
7482e384 | 1581 | queue_delayed_work(system_power_efficient_wq, &tbl->managed_work, |
211da42e | 1582 | NEIGH_VAR(&tbl->parms, INTERVAL_PROBE_TIME_MS)); |
7482e384 DB |
1583 | write_unlock_bh(&tbl->lock); |
1584 | } | |
1585 | ||
e99e88a9 | 1586 | static void neigh_proxy_process(struct timer_list *t) |
1da177e4 | 1587 | { |
e99e88a9 | 1588 | struct neigh_table *tbl = from_timer(tbl, t, proxy_timer); |
1da177e4 LT |
1589 | long sched_next = 0; |
1590 | unsigned long now = jiffies; | |
f72051b0 | 1591 | struct sk_buff *skb, *n; |
1da177e4 LT |
1592 | |
1593 | spin_lock(&tbl->proxy_queue.lock); | |
1594 | ||
f72051b0 DM |
1595 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1596 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1597 | |
1da177e4 | 1598 | if (tdif <= 0) { |
f72051b0 | 1599 | struct net_device *dev = skb->dev; |
20e6074e | 1600 | |
f72051b0 | 1601 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1602 | if (tbl->proxy_redo && netif_running(dev)) { |
1603 | rcu_read_lock(); | |
f72051b0 | 1604 | tbl->proxy_redo(skb); |
20e6074e ED |
1605 | rcu_read_unlock(); |
1606 | } else { | |
f72051b0 | 1607 | kfree_skb(skb); |
20e6074e | 1608 | } |
1da177e4 LT |
1609 | |
1610 | dev_put(dev); | |
1611 | } else if (!sched_next || tdif < sched_next) | |
1612 | sched_next = tdif; | |
1613 | } | |
1614 | del_timer(&tbl->proxy_timer); | |
1615 | if (sched_next) | |
1616 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1617 | spin_unlock(&tbl->proxy_queue.lock); | |
1618 | } | |
1619 | ||
1620 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1621 | struct sk_buff *skb) | |
1622 | { | |
a533b70a | 1623 | unsigned long sched_next = jiffies + |
1624 | prandom_u32_max(NEIGH_VAR(p, PROXY_DELAY)); | |
1da177e4 | 1625 | |
1f9248e5 | 1626 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1627 | kfree_skb(skb); |
1628 | return; | |
1629 | } | |
a61bbcf2 PM |
1630 | |
1631 | NEIGH_CB(skb)->sched_next = sched_next; | |
1632 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1633 | |
1634 | spin_lock(&tbl->proxy_queue.lock); | |
1635 | if (del_timer(&tbl->proxy_timer)) { | |
1636 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1637 | sched_next = tbl->proxy_timer.expires; | |
1638 | } | |
adf30907 | 1639 | skb_dst_drop(skb); |
1da177e4 LT |
1640 | dev_hold(skb->dev); |
1641 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1642 | mod_timer(&tbl->proxy_timer, sched_next); | |
1643 | spin_unlock(&tbl->proxy_queue.lock); | |
1644 | } | |
0a204500 | 1645 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1646 | |
97fd5bc7 | 1647 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1648 | struct net *net, int ifindex) |
1649 | { | |
1650 | struct neigh_parms *p; | |
1651 | ||
75fbfd33 | 1652 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1653 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1654 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1655 | return p; |
1656 | } | |
1657 | ||
1658 | return NULL; | |
1659 | } | |
1da177e4 LT |
1660 | |
1661 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1662 | struct neigh_table *tbl) | |
1663 | { | |
cf89d6b2 | 1664 | struct neigh_parms *p; |
00829823 SH |
1665 | struct net *net = dev_net(dev); |
1666 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1667 | |
cf89d6b2 | 1668 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1669 | if (p) { |
1da177e4 | 1670 | p->tbl = tbl; |
6343944b | 1671 | refcount_set(&p->refcnt, 1); |
1da177e4 | 1672 | p->reachable_time = |
1f9248e5 | 1673 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
d62607c3 | 1674 | netdev_hold(dev, &p->dev_tracker, GFP_KERNEL); |
63134803 | 1675 | p->dev = dev; |
efd7ef1c | 1676 | write_pnet(&p->net, net); |
63134803 | 1677 | p->sysctl_table = NULL; |
c7fb64db | 1678 | |
00829823 | 1679 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
d62607c3 | 1680 | netdev_put(dev, &p->dev_tracker); |
486b51d3 DL |
1681 | kfree(p); |
1682 | return NULL; | |
1da177e4 | 1683 | } |
486b51d3 | 1684 | |
1da177e4 | 1685 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1686 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1687 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1688 | |
1689 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1690 | } |
1691 | return p; | |
1692 | } | |
0a204500 | 1693 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1694 | |
1695 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1696 | { | |
1697 | struct neigh_parms *parms = | |
1698 | container_of(head, struct neigh_parms, rcu_head); | |
1699 | ||
1700 | neigh_parms_put(parms); | |
1701 | } | |
1702 | ||
1703 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1704 | { | |
1da177e4 LT |
1705 | if (!parms || parms == &tbl->parms) |
1706 | return; | |
1707 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1708 | list_del(&parms->list); |
1709 | parms->dead = 1; | |
1da177e4 | 1710 | write_unlock_bh(&tbl->lock); |
d62607c3 | 1711 | netdev_put(parms->dev, &parms->dev_tracker); |
75fbfd33 | 1712 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
1da177e4 | 1713 | } |
0a204500 | 1714 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1715 | |
06f0511d | 1716 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1717 | { |
1718 | kfree(parms); | |
1719 | } | |
1720 | ||
c2ecba71 PE |
1721 | static struct lock_class_key neigh_table_proxy_queue_class; |
1722 | ||
d7480fd3 WC |
1723 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1724 | ||
1725 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1726 | { |
1727 | unsigned long now = jiffies; | |
1728 | unsigned long phsize; | |
1729 | ||
75fbfd33 | 1730 | INIT_LIST_HEAD(&tbl->parms_list); |
58956317 | 1731 | INIT_LIST_HEAD(&tbl->gc_list); |
7482e384 DB |
1732 | INIT_LIST_HEAD(&tbl->managed_list); |
1733 | ||
75fbfd33 | 1734 | list_add(&tbl->parms.list, &tbl->parms_list); |
e42ea986 | 1735 | write_pnet(&tbl->parms.net, &init_net); |
6343944b | 1736 | refcount_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1737 | tbl->parms.reachable_time = |
1f9248e5 | 1738 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1739 | |
1da177e4 LT |
1740 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1741 | if (!tbl->stats) | |
1742 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1743 | |
1da177e4 | 1744 | #ifdef CONFIG_PROC_FS |
71a5053a CH |
1745 | if (!proc_create_seq_data(tbl->id, 0, init_net.proc_net_stat, |
1746 | &neigh_stat_seq_ops, tbl)) | |
1da177e4 | 1747 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1748 | #endif |
1749 | ||
cd089336 | 1750 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1751 | |
1752 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1753 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1754 | |
d6bf7817 | 1755 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1756 | panic("cannot allocate neighbour cache hashes"); |
1757 | ||
08433eff YH |
1758 | if (!tbl->entry_size) |
1759 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1760 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1761 | else | |
1762 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1763 | ||
1da177e4 | 1764 | rwlock_init(&tbl->lock); |
7482e384 | 1765 | |
203b42f7 | 1766 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b | 1767 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1768 | tbl->parms.reachable_time); | |
7482e384 DB |
1769 | INIT_DEFERRABLE_WORK(&tbl->managed_work, neigh_managed_work); |
1770 | queue_delayed_work(system_power_efficient_wq, &tbl->managed_work, 0); | |
1771 | ||
e99e88a9 | 1772 | timer_setup(&tbl->proxy_timer, neigh_proxy_process, 0); |
c2ecba71 PE |
1773 | skb_queue_head_init_class(&tbl->proxy_queue, |
1774 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1775 | |
1776 | tbl->last_flush = now; | |
1777 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1778 | |
d7480fd3 | 1779 | neigh_tables[index] = tbl; |
1da177e4 | 1780 | } |
0a204500 | 1781 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1782 | |
d7480fd3 | 1783 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1784 | { |
d7480fd3 | 1785 | neigh_tables[index] = NULL; |
1da177e4 | 1786 | /* It is not clean... Fix it to unload IPv6 module safely */ |
4177d5b0 | 1787 | cancel_delayed_work_sync(&tbl->managed_work); |
a5c30b34 | 1788 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1789 | del_timer_sync(&tbl->proxy_timer); |
1790 | pneigh_queue_purge(&tbl->proxy_queue); | |
1791 | neigh_ifdown(tbl, NULL); | |
1792 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1793 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1794 | |
6193d2be ED |
1795 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1796 | neigh_hash_free_rcu); | |
d6bf7817 | 1797 | tbl->nht = NULL; |
1da177e4 LT |
1798 | |
1799 | kfree(tbl->phash_buckets); | |
1800 | tbl->phash_buckets = NULL; | |
1801 | ||
3f192b5c AD |
1802 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1803 | ||
3fcde74b KK |
1804 | free_percpu(tbl->stats); |
1805 | tbl->stats = NULL; | |
1806 | ||
1da177e4 LT |
1807 | return 0; |
1808 | } | |
0a204500 | 1809 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1810 | |
d7480fd3 WC |
1811 | static struct neigh_table *neigh_find_table(int family) |
1812 | { | |
1813 | struct neigh_table *tbl = NULL; | |
1814 | ||
1815 | switch (family) { | |
1816 | case AF_INET: | |
1817 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1818 | break; | |
1819 | case AF_INET6: | |
1820 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1821 | break; | |
1822 | case AF_DECnet: | |
1823 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1824 | break; | |
1825 | } | |
1826 | ||
1827 | return tbl; | |
1828 | } | |
1829 | ||
82cbb5c6 | 1830 | const struct nla_policy nda_policy[NDA_MAX+1] = { |
1274e1cc | 1831 | [NDA_UNSPEC] = { .strict_start_type = NDA_NH_ID }, |
82cbb5c6 RP |
1832 | [NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, |
1833 | [NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
1834 | [NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) }, | |
1835 | [NDA_PROBES] = { .type = NLA_U32 }, | |
1836 | [NDA_VLAN] = { .type = NLA_U16 }, | |
1837 | [NDA_PORT] = { .type = NLA_U16 }, | |
1838 | [NDA_VNI] = { .type = NLA_U32 }, | |
1839 | [NDA_IFINDEX] = { .type = NLA_U32 }, | |
1840 | [NDA_MASTER] = { .type = NLA_U32 }, | |
a9cd3439 | 1841 | [NDA_PROTOCOL] = { .type = NLA_U8 }, |
1274e1cc | 1842 | [NDA_NH_ID] = { .type = NLA_U32 }, |
c8e80c11 | 1843 | [NDA_FLAGS_EXT] = NLA_POLICY_MASK(NLA_U32, NTF_EXT_MASK), |
899426b3 | 1844 | [NDA_FDB_EXT_ATTRS] = { .type = NLA_NESTED }, |
82cbb5c6 RP |
1845 | }; |
1846 | ||
c21ef3e3 DA |
1847 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, |
1848 | struct netlink_ext_ack *extack) | |
1da177e4 | 1849 | { |
3b1e0a65 | 1850 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1851 | struct ndmsg *ndm; |
1852 | struct nlattr *dst_attr; | |
1da177e4 | 1853 | struct neigh_table *tbl; |
d7480fd3 | 1854 | struct neighbour *neigh; |
1da177e4 | 1855 | struct net_device *dev = NULL; |
a14a49d2 | 1856 | int err = -EINVAL; |
1da177e4 | 1857 | |
110b2499 | 1858 | ASSERT_RTNL(); |
a14a49d2 | 1859 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1860 | goto out; |
1861 | ||
a14a49d2 | 1862 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
7a35a50d DA |
1863 | if (!dst_attr) { |
1864 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
a14a49d2 | 1865 | goto out; |
7a35a50d | 1866 | } |
a14a49d2 TG |
1867 | |
1868 | ndm = nlmsg_data(nlh); | |
1869 | if (ndm->ndm_ifindex) { | |
110b2499 | 1870 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1871 | if (dev == NULL) { |
1872 | err = -ENODEV; | |
1873 | goto out; | |
1874 | } | |
1875 | } | |
1876 | ||
d7480fd3 WC |
1877 | tbl = neigh_find_table(ndm->ndm_family); |
1878 | if (tbl == NULL) | |
1879 | return -EAFNOSUPPORT; | |
1da177e4 | 1880 | |
7a35a50d DA |
1881 | if (nla_len(dst_attr) < (int)tbl->key_len) { |
1882 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1883 | goto out; |
7a35a50d | 1884 | } |
1da177e4 | 1885 | |
d7480fd3 WC |
1886 | if (ndm->ndm_flags & NTF_PROXY) { |
1887 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1888 | goto out; | |
1889 | } | |
1da177e4 | 1890 | |
d7480fd3 WC |
1891 | if (dev == NULL) |
1892 | goto out; | |
a14a49d2 | 1893 | |
d7480fd3 WC |
1894 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1895 | if (neigh == NULL) { | |
1896 | err = -ENOENT; | |
110b2499 | 1897 | goto out; |
1da177e4 | 1898 | } |
d7480fd3 | 1899 | |
7a35a50d DA |
1900 | err = __neigh_update(neigh, NULL, NUD_FAILED, |
1901 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, | |
1902 | NETLINK_CB(skb).portid, extack); | |
5071034e | 1903 | write_lock_bh(&tbl->lock); |
d7480fd3 | 1904 | neigh_release(neigh); |
5071034e SV |
1905 | neigh_remove_one(neigh, tbl); |
1906 | write_unlock_bh(&tbl->lock); | |
a14a49d2 | 1907 | |
1da177e4 LT |
1908 | out: |
1909 | return err; | |
1910 | } | |
1911 | ||
c21ef3e3 DA |
1912 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
1913 | struct netlink_ext_ack *extack) | |
1da177e4 | 1914 | { |
f7aa74e4 | 1915 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE | |
2c611ad9 | 1916 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER; |
3b1e0a65 | 1917 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1918 | struct ndmsg *ndm; |
1919 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1920 | struct neigh_table *tbl; |
1921 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1922 | struct neighbour *neigh; |
1923 | void *dst, *lladdr; | |
df9b0e30 | 1924 | u8 protocol = 0; |
2c611ad9 | 1925 | u32 ndm_flags; |
5208debd | 1926 | int err; |
1da177e4 | 1927 | |
110b2499 | 1928 | ASSERT_RTNL(); |
8cb08174 JB |
1929 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, |
1930 | nda_policy, extack); | |
5208debd | 1931 | if (err < 0) |
1da177e4 LT |
1932 | goto out; |
1933 | ||
5208debd | 1934 | err = -EINVAL; |
7a35a50d DA |
1935 | if (!tb[NDA_DST]) { |
1936 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
5208debd | 1937 | goto out; |
7a35a50d | 1938 | } |
5208debd TG |
1939 | |
1940 | ndm = nlmsg_data(nlh); | |
2c611ad9 RP |
1941 | ndm_flags = ndm->ndm_flags; |
1942 | if (tb[NDA_FLAGS_EXT]) { | |
1943 | u32 ext = nla_get_u32(tb[NDA_FLAGS_EXT]); | |
1944 | ||
507c2f1d DB |
1945 | BUILD_BUG_ON(sizeof(neigh->flags) * BITS_PER_BYTE < |
1946 | (sizeof(ndm->ndm_flags) * BITS_PER_BYTE + | |
1947 | hweight32(NTF_EXT_MASK))); | |
2c611ad9 RP |
1948 | ndm_flags |= (ext << NTF_EXT_SHIFT); |
1949 | } | |
5208debd | 1950 | if (ndm->ndm_ifindex) { |
110b2499 | 1951 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1952 | if (dev == NULL) { |
1953 | err = -ENODEV; | |
1954 | goto out; | |
1955 | } | |
1956 | ||
7a35a50d DA |
1957 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) { |
1958 | NL_SET_ERR_MSG(extack, "Invalid link address"); | |
110b2499 | 1959 | goto out; |
7a35a50d | 1960 | } |
5208debd TG |
1961 | } |
1962 | ||
d7480fd3 WC |
1963 | tbl = neigh_find_table(ndm->ndm_family); |
1964 | if (tbl == NULL) | |
1965 | return -EAFNOSUPPORT; | |
1da177e4 | 1966 | |
7a35a50d DA |
1967 | if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) { |
1968 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1969 | goto out; |
7a35a50d DA |
1970 | } |
1971 | ||
d7480fd3 WC |
1972 | dst = nla_data(tb[NDA_DST]); |
1973 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1974 | |
a9cd3439 | 1975 | if (tb[NDA_PROTOCOL]) |
df9b0e30 | 1976 | protocol = nla_get_u8(tb[NDA_PROTOCOL]); |
2c611ad9 | 1977 | if (ndm_flags & NTF_PROXY) { |
d7480fd3 WC |
1978 | struct pneigh_entry *pn; |
1979 | ||
7482e384 DB |
1980 | if (ndm_flags & NTF_MANAGED) { |
1981 | NL_SET_ERR_MSG(extack, "Invalid NTF_* flag combination"); | |
1982 | goto out; | |
1983 | } | |
1984 | ||
d7480fd3 WC |
1985 | err = -ENOBUFS; |
1986 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1987 | if (pn) { | |
2c611ad9 | 1988 | pn->flags = ndm_flags; |
df9b0e30 DA |
1989 | if (protocol) |
1990 | pn->protocol = protocol; | |
d7480fd3 WC |
1991 | err = 0; |
1992 | } | |
1993 | goto out; | |
1994 | } | |
1da177e4 | 1995 | |
7a35a50d DA |
1996 | if (!dev) { |
1997 | NL_SET_ERR_MSG(extack, "Device not specified"); | |
d7480fd3 | 1998 | goto out; |
7a35a50d | 1999 | } |
62dd9318 | 2000 | |
b8fb1ab4 DA |
2001 | if (tbl->allow_add && !tbl->allow_add(dev, extack)) { |
2002 | err = -EINVAL; | |
2003 | goto out; | |
2004 | } | |
2005 | ||
d7480fd3 WC |
2006 | neigh = neigh_lookup(tbl, dst, dev); |
2007 | if (neigh == NULL) { | |
30fc7efa DB |
2008 | bool ndm_permanent = ndm->ndm_state & NUD_PERMANENT; |
2009 | bool exempt_from_gc = ndm_permanent || | |
2010 | ndm_flags & NTF_EXT_LEARNED; | |
e997f8a2 | 2011 | |
d7480fd3 WC |
2012 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
2013 | err = -ENOENT; | |
110b2499 | 2014 | goto out; |
1da177e4 | 2015 | } |
30fc7efa DB |
2016 | if (ndm_permanent && (ndm_flags & NTF_MANAGED)) { |
2017 | NL_SET_ERR_MSG(extack, "Invalid NTF_* flag for permanent entry"); | |
2018 | err = -EINVAL; | |
2019 | goto out; | |
2020 | } | |
1da177e4 | 2021 | |
e4400bbf | 2022 | neigh = ___neigh_create(tbl, dst, dev, |
7482e384 DB |
2023 | ndm_flags & |
2024 | (NTF_EXT_LEARNED | NTF_MANAGED), | |
e4400bbf | 2025 | exempt_from_gc, true); |
d7480fd3 WC |
2026 | if (IS_ERR(neigh)) { |
2027 | err = PTR_ERR(neigh); | |
2028 | goto out; | |
2029 | } | |
2030 | } else { | |
2031 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
2032 | err = -EEXIST; | |
2033 | neigh_release(neigh); | |
110b2499 | 2034 | goto out; |
5208debd | 2035 | } |
1da177e4 | 2036 | |
d7480fd3 | 2037 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
f7aa74e4 RP |
2038 | flags &= ~(NEIGH_UPDATE_F_OVERRIDE | |
2039 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1da177e4 LT |
2040 | } |
2041 | ||
38212bb3 RM |
2042 | if (protocol) |
2043 | neigh->protocol = protocol; | |
2c611ad9 | 2044 | if (ndm_flags & NTF_EXT_LEARNED) |
9ce33e46 | 2045 | flags |= NEIGH_UPDATE_F_EXT_LEARNED; |
2c611ad9 | 2046 | if (ndm_flags & NTF_ROUTER) |
f7aa74e4 | 2047 | flags |= NEIGH_UPDATE_F_ISROUTER; |
7482e384 DB |
2048 | if (ndm_flags & NTF_MANAGED) |
2049 | flags |= NEIGH_UPDATE_F_MANAGED; | |
2c611ad9 | 2050 | if (ndm_flags & NTF_USE) |
3dc20f47 | 2051 | flags |= NEIGH_UPDATE_F_USE; |
f7aa74e4 | 2052 | |
3dc20f47 DB |
2053 | err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags, |
2054 | NETLINK_CB(skb).portid, extack); | |
7482e384 | 2055 | if (!err && ndm_flags & (NTF_USE | NTF_MANAGED)) { |
d7480fd3 WC |
2056 | neigh_event_send(neigh, NULL); |
2057 | err = 0; | |
3dc20f47 | 2058 | } |
d7480fd3 | 2059 | neigh_release(neigh); |
1da177e4 LT |
2060 | out: |
2061 | return err; | |
2062 | } | |
2063 | ||
c7fb64db TG |
2064 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
2065 | { | |
ca860fb3 TG |
2066 | struct nlattr *nest; |
2067 | ||
ae0be8de | 2068 | nest = nla_nest_start_noflag(skb, NDTA_PARMS); |
ca860fb3 TG |
2069 | if (nest == NULL) |
2070 | return -ENOBUFS; | |
c7fb64db | 2071 | |
9a6308d7 DM |
2072 | if ((parms->dev && |
2073 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
6343944b | 2074 | nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) || |
1f9248e5 JP |
2075 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
2076 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
2077 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
2078 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
2079 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
2080 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
2081 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
2082 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
2083 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
2084 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
2085 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
2086 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
2087 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
2088 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
2089 | NDTPA_PAD) || | |
9a6308d7 | 2090 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 2091 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 2092 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 2093 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 2094 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 2095 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 2096 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 2097 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 2098 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 2099 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 2100 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 2101 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 2102 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
211da42e YW |
2103 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD) || |
2104 | nla_put_msecs(skb, NDTPA_INTERVAL_PROBE_TIME_MS, | |
2105 | NEIGH_VAR(parms, INTERVAL_PROBE_TIME_MS), NDTPA_PAD)) | |
9a6308d7 | 2106 | goto nla_put_failure; |
ca860fb3 | 2107 | return nla_nest_end(skb, nest); |
c7fb64db | 2108 | |
ca860fb3 | 2109 | nla_put_failure: |
bc3ed28c TG |
2110 | nla_nest_cancel(skb, nest); |
2111 | return -EMSGSIZE; | |
c7fb64db TG |
2112 | } |
2113 | ||
ca860fb3 TG |
2114 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
2115 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
2116 | { |
2117 | struct nlmsghdr *nlh; | |
2118 | struct ndtmsg *ndtmsg; | |
2119 | ||
ca860fb3 TG |
2120 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2121 | if (nlh == NULL) | |
26932566 | 2122 | return -EMSGSIZE; |
c7fb64db | 2123 | |
ca860fb3 | 2124 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2125 | |
2126 | read_lock_bh(&tbl->lock); | |
2127 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2128 | ndtmsg->ndtm_pad1 = 0; |
2129 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2130 | |
9a6308d7 | 2131 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 2132 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
2133 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
2134 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
2135 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
2136 | goto nla_put_failure; | |
c7fb64db TG |
2137 | { |
2138 | unsigned long now = jiffies; | |
9d027e3a ED |
2139 | long flush_delta = now - tbl->last_flush; |
2140 | long rand_delta = now - tbl->last_rand; | |
d6bf7817 | 2141 | struct neigh_hash_table *nht; |
c7fb64db TG |
2142 | struct ndt_config ndc = { |
2143 | .ndtc_key_len = tbl->key_len, | |
2144 | .ndtc_entry_size = tbl->entry_size, | |
2145 | .ndtc_entries = atomic_read(&tbl->entries), | |
2146 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
2147 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
2148 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
2149 | }; | |
2150 | ||
d6bf7817 ED |
2151 | rcu_read_lock_bh(); |
2152 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 2153 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 2154 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
2155 | rcu_read_unlock_bh(); |
2156 | ||
9a6308d7 DM |
2157 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
2158 | goto nla_put_failure; | |
c7fb64db TG |
2159 | } |
2160 | ||
2161 | { | |
2162 | int cpu; | |
2163 | struct ndt_stats ndst; | |
2164 | ||
2165 | memset(&ndst, 0, sizeof(ndst)); | |
2166 | ||
6f912042 | 2167 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
2168 | struct neigh_statistics *st; |
2169 | ||
c7fb64db TG |
2170 | st = per_cpu_ptr(tbl->stats, cpu); |
2171 | ndst.ndts_allocs += st->allocs; | |
2172 | ndst.ndts_destroys += st->destroys; | |
2173 | ndst.ndts_hash_grows += st->hash_grows; | |
2174 | ndst.ndts_res_failed += st->res_failed; | |
2175 | ndst.ndts_lookups += st->lookups; | |
2176 | ndst.ndts_hits += st->hits; | |
2177 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
2178 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
2179 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
2180 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 2181 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
2182 | } |
2183 | ||
b676338f ND |
2184 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
2185 | NDTA_PAD)) | |
9a6308d7 | 2186 | goto nla_put_failure; |
c7fb64db TG |
2187 | } |
2188 | ||
2189 | BUG_ON(tbl->parms.dev); | |
2190 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 2191 | goto nla_put_failure; |
c7fb64db TG |
2192 | |
2193 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2194 | nlmsg_end(skb, nlh); |
2195 | return 0; | |
c7fb64db | 2196 | |
ca860fb3 | 2197 | nla_put_failure: |
c7fb64db | 2198 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2199 | nlmsg_cancel(skb, nlh); |
2200 | return -EMSGSIZE; | |
c7fb64db TG |
2201 | } |
2202 | ||
ca860fb3 TG |
2203 | static int neightbl_fill_param_info(struct sk_buff *skb, |
2204 | struct neigh_table *tbl, | |
c7fb64db | 2205 | struct neigh_parms *parms, |
ca860fb3 TG |
2206 | u32 pid, u32 seq, int type, |
2207 | unsigned int flags) | |
c7fb64db TG |
2208 | { |
2209 | struct ndtmsg *ndtmsg; | |
2210 | struct nlmsghdr *nlh; | |
2211 | ||
ca860fb3 TG |
2212 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2213 | if (nlh == NULL) | |
26932566 | 2214 | return -EMSGSIZE; |
c7fb64db | 2215 | |
ca860fb3 | 2216 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2217 | |
2218 | read_lock_bh(&tbl->lock); | |
2219 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2220 | ndtmsg->ndtm_pad1 = 0; |
2221 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2222 | |
ca860fb3 TG |
2223 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
2224 | neightbl_fill_parms(skb, parms) < 0) | |
2225 | goto errout; | |
c7fb64db TG |
2226 | |
2227 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2228 | nlmsg_end(skb, nlh); |
2229 | return 0; | |
ca860fb3 | 2230 | errout: |
c7fb64db | 2231 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2232 | nlmsg_cancel(skb, nlh); |
2233 | return -EMSGSIZE; | |
c7fb64db | 2234 | } |
4ec93edb | 2235 | |
ef7c79ed | 2236 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
2237 | [NDTA_NAME] = { .type = NLA_STRING }, |
2238 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
2239 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
2240 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
2241 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
2242 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
2243 | }; | |
2244 | ||
ef7c79ed | 2245 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
2246 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
2247 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
2248 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
2249 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
2250 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
2251 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 2252 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
2253 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
2254 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
2255 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
2256 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
2257 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
2258 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
2259 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
211da42e | 2260 | [NDTPA_INTERVAL_PROBE_TIME_MS] = { .type = NLA_U64, .min = 1 }, |
6b3f8674 TG |
2261 | }; |
2262 | ||
c21ef3e3 DA |
2263 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, |
2264 | struct netlink_ext_ack *extack) | |
c7fb64db | 2265 | { |
3b1e0a65 | 2266 | struct net *net = sock_net(skb->sk); |
c7fb64db | 2267 | struct neigh_table *tbl; |
6b3f8674 TG |
2268 | struct ndtmsg *ndtmsg; |
2269 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
2270 | bool found = false; |
2271 | int err, tidx; | |
c7fb64db | 2272 | |
8cb08174 JB |
2273 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
2274 | nl_neightbl_policy, extack); | |
6b3f8674 TG |
2275 | if (err < 0) |
2276 | goto errout; | |
c7fb64db | 2277 | |
6b3f8674 TG |
2278 | if (tb[NDTA_NAME] == NULL) { |
2279 | err = -EINVAL; | |
2280 | goto errout; | |
2281 | } | |
2282 | ||
2283 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
2284 | |
2285 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
2286 | tbl = neigh_tables[tidx]; | |
2287 | if (!tbl) | |
2288 | continue; | |
c7fb64db TG |
2289 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
2290 | continue; | |
d7480fd3 WC |
2291 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
2292 | found = true; | |
c7fb64db | 2293 | break; |
d7480fd3 | 2294 | } |
c7fb64db TG |
2295 | } |
2296 | ||
d7480fd3 WC |
2297 | if (!found) |
2298 | return -ENOENT; | |
c7fb64db | 2299 | |
4ec93edb | 2300 | /* |
c7fb64db TG |
2301 | * We acquire tbl->lock to be nice to the periodic timers and |
2302 | * make sure they always see a consistent set of values. | |
2303 | */ | |
2304 | write_lock_bh(&tbl->lock); | |
2305 | ||
6b3f8674 TG |
2306 | if (tb[NDTA_PARMS]) { |
2307 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 2308 | struct neigh_parms *p; |
6b3f8674 | 2309 | int i, ifindex = 0; |
c7fb64db | 2310 | |
8cb08174 JB |
2311 | err = nla_parse_nested_deprecated(tbp, NDTPA_MAX, |
2312 | tb[NDTA_PARMS], | |
2313 | nl_ntbl_parm_policy, extack); | |
6b3f8674 TG |
2314 | if (err < 0) |
2315 | goto errout_tbl_lock; | |
c7fb64db | 2316 | |
6b3f8674 TG |
2317 | if (tbp[NDTPA_IFINDEX]) |
2318 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 2319 | |
97fd5bc7 | 2320 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
2321 | if (p == NULL) { |
2322 | err = -ENOENT; | |
6b3f8674 | 2323 | goto errout_tbl_lock; |
c7fb64db | 2324 | } |
c7fb64db | 2325 | |
6b3f8674 TG |
2326 | for (i = 1; i <= NDTPA_MAX; i++) { |
2327 | if (tbp[i] == NULL) | |
2328 | continue; | |
c7fb64db | 2329 | |
6b3f8674 TG |
2330 | switch (i) { |
2331 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2332 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2333 | nla_get_u32(tbp[i]) * | |
2334 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2335 | break; |
2336 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2337 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2338 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2339 | break; |
2340 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2341 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2342 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2343 | break; |
2344 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2345 | NEIGH_VAR_SET(p, APP_PROBES, |
2346 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2347 | break; |
2348 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2349 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2350 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2351 | break; |
2352 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2353 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2354 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2355 | break; |
8da86466 YH |
2356 | case NDTPA_MCAST_REPROBES: |
2357 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2358 | nla_get_u32(tbp[i])); | |
2359 | break; | |
6b3f8674 | 2360 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2361 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2362 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2363 | /* update reachable_time as well, otherwise, the change will |
2364 | * only be effective after the next time neigh_periodic_work | |
2365 | * decides to recompute it (can be multiple minutes) | |
2366 | */ | |
2367 | p->reachable_time = | |
2368 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2369 | break; |
2370 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2371 | NEIGH_VAR_SET(p, GC_STALETIME, |
2372 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2373 | break; |
2374 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2375 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2376 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2377 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 | 2378 | break; |
211da42e YW |
2379 | case NDTPA_INTERVAL_PROBE_TIME_MS: |
2380 | NEIGH_VAR_SET(p, INTERVAL_PROBE_TIME_MS, | |
2381 | nla_get_msecs(tbp[i])); | |
2382 | break; | |
6b3f8674 | 2383 | case NDTPA_RETRANS_TIME: |
1f9248e5 JP |
2384 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2385 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2386 | break; |
2387 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2388 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2389 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2390 | break; |
2391 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2392 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2393 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2394 | break; |
2395 | case NDTPA_LOCKTIME: | |
3977458c JP |
2396 | NEIGH_VAR_SET(p, LOCKTIME, |
2397 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2398 | break; |
2399 | } | |
2400 | } | |
2401 | } | |
c7fb64db | 2402 | |
dc25c676 G |
2403 | err = -ENOENT; |
2404 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2405 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2406 | !net_eq(net, &init_net)) | |
2407 | goto errout_tbl_lock; | |
2408 | ||
6b3f8674 TG |
2409 | if (tb[NDTA_THRESH1]) |
2410 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2411 | |
6b3f8674 TG |
2412 | if (tb[NDTA_THRESH2]) |
2413 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2414 | |
6b3f8674 TG |
2415 | if (tb[NDTA_THRESH3]) |
2416 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2417 | |
6b3f8674 TG |
2418 | if (tb[NDTA_GC_INTERVAL]) |
2419 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2420 | |
2421 | err = 0; | |
2422 | ||
6b3f8674 | 2423 | errout_tbl_lock: |
c7fb64db | 2424 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2425 | errout: |
c7fb64db TG |
2426 | return err; |
2427 | } | |
2428 | ||
9632d47f DA |
2429 | static int neightbl_valid_dump_info(const struct nlmsghdr *nlh, |
2430 | struct netlink_ext_ack *extack) | |
2431 | { | |
2432 | struct ndtmsg *ndtm; | |
2433 | ||
2434 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) { | |
2435 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request"); | |
2436 | return -EINVAL; | |
2437 | } | |
2438 | ||
2439 | ndtm = nlmsg_data(nlh); | |
2440 | if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) { | |
2441 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request"); | |
2442 | return -EINVAL; | |
2443 | } | |
2444 | ||
2445 | if (nlmsg_attrlen(nlh, sizeof(*ndtm))) { | |
2446 | NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request"); | |
2447 | return -EINVAL; | |
2448 | } | |
2449 | ||
2450 | return 0; | |
2451 | } | |
2452 | ||
c8822a4e | 2453 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2454 | { |
9632d47f | 2455 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 2456 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2457 | int family, tidx, nidx = 0; |
2458 | int tbl_skip = cb->args[0]; | |
2459 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2460 | struct neigh_table *tbl; |
2461 | ||
9632d47f DA |
2462 | if (cb->strict_check) { |
2463 | int err = neightbl_valid_dump_info(nlh, cb->extack); | |
2464 | ||
2465 | if (err < 0) | |
2466 | return err; | |
2467 | } | |
2468 | ||
2469 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; | |
c7fb64db | 2470 | |
d7480fd3 | 2471 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2472 | struct neigh_parms *p; |
2473 | ||
d7480fd3 WC |
2474 | tbl = neigh_tables[tidx]; |
2475 | if (!tbl) | |
2476 | continue; | |
2477 | ||
ca860fb3 | 2478 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2479 | continue; |
2480 | ||
15e47304 | 2481 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
9632d47f | 2482 | nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2483 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2484 | break; |
2485 | ||
75fbfd33 ND |
2486 | nidx = 0; |
2487 | p = list_next_entry(&tbl->parms, list); | |
2488 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2489 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2490 | continue; |
2491 | ||
efc683fc GK |
2492 | if (nidx < neigh_skip) |
2493 | goto next; | |
c7fb64db | 2494 | |
ca860fb3 | 2495 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2496 | NETLINK_CB(cb->skb).portid, |
9632d47f | 2497 | nlh->nlmsg_seq, |
ca860fb3 | 2498 | RTM_NEWNEIGHTBL, |
7b46a644 | 2499 | NLM_F_MULTI) < 0) |
c7fb64db | 2500 | goto out; |
efc683fc GK |
2501 | next: |
2502 | nidx++; | |
c7fb64db TG |
2503 | } |
2504 | ||
ca860fb3 | 2505 | neigh_skip = 0; |
c7fb64db TG |
2506 | } |
2507 | out: | |
ca860fb3 TG |
2508 | cb->args[0] = tidx; |
2509 | cb->args[1] = nidx; | |
c7fb64db TG |
2510 | |
2511 | return skb->len; | |
2512 | } | |
1da177e4 | 2513 | |
8b8aec50 TG |
2514 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2515 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 | 2516 | { |
2c611ad9 | 2517 | u32 neigh_flags, neigh_flags_ext; |
1da177e4 | 2518 | unsigned long now = jiffies; |
1da177e4 | 2519 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2520 | struct nlmsghdr *nlh; |
2521 | struct ndmsg *ndm; | |
2522 | ||
2523 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2524 | if (nlh == NULL) | |
26932566 | 2525 | return -EMSGSIZE; |
1da177e4 | 2526 | |
2c611ad9 RP |
2527 | neigh_flags_ext = neigh->flags >> NTF_EXT_SHIFT; |
2528 | neigh_flags = neigh->flags & NTF_OLD_MASK; | |
2529 | ||
8b8aec50 TG |
2530 | ndm = nlmsg_data(nlh); |
2531 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2532 | ndm->ndm_pad1 = 0; |
2533 | ndm->ndm_pad2 = 0; | |
2c611ad9 | 2534 | ndm->ndm_flags = neigh_flags; |
8b8aec50 TG |
2535 | ndm->ndm_type = neigh->type; |
2536 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2537 | |
9a6308d7 DM |
2538 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2539 | goto nla_put_failure; | |
8b8aec50 TG |
2540 | |
2541 | read_lock_bh(&neigh->lock); | |
2542 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2543 | if (neigh->nud_state & NUD_VALID) { |
2544 | char haddr[MAX_ADDR_LEN]; | |
2545 | ||
2546 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2547 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2548 | read_unlock_bh(&neigh->lock); | |
2549 | goto nla_put_failure; | |
2550 | } | |
8b8aec50 TG |
2551 | } |
2552 | ||
b9f5f52c SH |
2553 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2554 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2555 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
9f237430 | 2556 | ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1; |
8b8aec50 TG |
2557 | read_unlock_bh(&neigh->lock); |
2558 | ||
9a6308d7 DM |
2559 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2560 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2561 | goto nla_put_failure; | |
8b8aec50 | 2562 | |
df9b0e30 DA |
2563 | if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol)) |
2564 | goto nla_put_failure; | |
2c611ad9 RP |
2565 | if (neigh_flags_ext && nla_put_u32(skb, NDA_FLAGS_EXT, neigh_flags_ext)) |
2566 | goto nla_put_failure; | |
df9b0e30 | 2567 | |
053c095a JB |
2568 | nlmsg_end(skb, nlh); |
2569 | return 0; | |
8b8aec50 TG |
2570 | |
2571 | nla_put_failure: | |
26932566 PM |
2572 | nlmsg_cancel(skb, nlh); |
2573 | return -EMSGSIZE; | |
1da177e4 LT |
2574 | } |
2575 | ||
84920c14 TZ |
2576 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2577 | u32 pid, u32 seq, int type, unsigned int flags, | |
2578 | struct neigh_table *tbl) | |
2579 | { | |
2c611ad9 | 2580 | u32 neigh_flags, neigh_flags_ext; |
84920c14 TZ |
2581 | struct nlmsghdr *nlh; |
2582 | struct ndmsg *ndm; | |
2583 | ||
2584 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2585 | if (nlh == NULL) | |
2586 | return -EMSGSIZE; | |
2587 | ||
2c611ad9 RP |
2588 | neigh_flags_ext = pn->flags >> NTF_EXT_SHIFT; |
2589 | neigh_flags = pn->flags & NTF_OLD_MASK; | |
2590 | ||
84920c14 TZ |
2591 | ndm = nlmsg_data(nlh); |
2592 | ndm->ndm_family = tbl->family; | |
2593 | ndm->ndm_pad1 = 0; | |
2594 | ndm->ndm_pad2 = 0; | |
2c611ad9 | 2595 | ndm->ndm_flags = neigh_flags | NTF_PROXY; |
545469f7 | 2596 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2597 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2598 | ndm->ndm_state = NUD_NONE; |
2599 | ||
9a6308d7 DM |
2600 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2601 | goto nla_put_failure; | |
84920c14 | 2602 | |
df9b0e30 DA |
2603 | if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol)) |
2604 | goto nla_put_failure; | |
2c611ad9 RP |
2605 | if (neigh_flags_ext && nla_put_u32(skb, NDA_FLAGS_EXT, neigh_flags_ext)) |
2606 | goto nla_put_failure; | |
df9b0e30 | 2607 | |
053c095a JB |
2608 | nlmsg_end(skb, nlh); |
2609 | return 0; | |
84920c14 TZ |
2610 | |
2611 | nla_put_failure: | |
2612 | nlmsg_cancel(skb, nlh); | |
2613 | return -EMSGSIZE; | |
2614 | } | |
2615 | ||
7b8f7a40 | 2616 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid) |
d961db35 TG |
2617 | { |
2618 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
7b8f7a40 | 2619 | __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid); |
d961db35 | 2620 | } |
1da177e4 | 2621 | |
21fdd092 DA |
2622 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2623 | { | |
2624 | struct net_device *master; | |
2625 | ||
2626 | if (!master_idx) | |
2627 | return false; | |
2628 | ||
aab456df | 2629 | master = dev ? netdev_master_upper_dev_get(dev) : NULL; |
d3432bf1 LS |
2630 | |
2631 | /* 0 is already used to denote NDA_MASTER wasn't passed, therefore need another | |
2632 | * invalid value for ifindex to denote "no master". | |
2633 | */ | |
2634 | if (master_idx == -1) | |
2635 | return !!master; | |
2636 | ||
21fdd092 DA |
2637 | if (!master || master->ifindex != master_idx) |
2638 | return true; | |
2639 | ||
2640 | return false; | |
2641 | } | |
2642 | ||
16660f0b DA |
2643 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2644 | { | |
aab456df | 2645 | if (filter_idx && (!dev || dev->ifindex != filter_idx)) |
16660f0b DA |
2646 | return true; |
2647 | ||
2648 | return false; | |
2649 | } | |
2650 | ||
6f52f80e DA |
2651 | struct neigh_dump_filter { |
2652 | int master_idx; | |
2653 | int dev_idx; | |
2654 | }; | |
2655 | ||
1da177e4 | 2656 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2657 | struct netlink_callback *cb, |
2658 | struct neigh_dump_filter *filter) | |
1da177e4 | 2659 | { |
767e97e1 | 2660 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2661 | struct neighbour *n; |
2662 | int rc, h, s_h = cb->args[1]; | |
2663 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2664 | struct neigh_hash_table *nht; |
21fdd092 | 2665 | unsigned int flags = NLM_F_MULTI; |
21fdd092 | 2666 | |
6f52f80e DA |
2667 | if (filter->dev_idx || filter->master_idx) |
2668 | flags |= NLM_F_DUMP_FILTERED; | |
1da177e4 | 2669 | |
d6bf7817 ED |
2670 | rcu_read_lock_bh(); |
2671 | nht = rcu_dereference_bh(tbl->nht); | |
2672 | ||
4bd6683b | 2673 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2674 | if (h > s_h) |
2675 | s_idx = 0; | |
767e97e1 ED |
2676 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2677 | n != NULL; | |
2678 | n = rcu_dereference_bh(n->next)) { | |
18502acd ZS |
2679 | if (idx < s_idx || !net_eq(dev_net(n->dev), net)) |
2680 | goto next; | |
6f52f80e DA |
2681 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2682 | neigh_master_filtered(n->dev, filter->master_idx)) | |
efc683fc | 2683 | goto next; |
15e47304 | 2684 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2685 | cb->nlh->nlmsg_seq, |
b6544c0b | 2686 | RTM_NEWNEIGH, |
21fdd092 | 2687 | flags) < 0) { |
1da177e4 LT |
2688 | rc = -1; |
2689 | goto out; | |
2690 | } | |
767e97e1 | 2691 | next: |
efc683fc | 2692 | idx++; |
1da177e4 | 2693 | } |
1da177e4 LT |
2694 | } |
2695 | rc = skb->len; | |
2696 | out: | |
d6bf7817 | 2697 | rcu_read_unlock_bh(); |
1da177e4 LT |
2698 | cb->args[1] = h; |
2699 | cb->args[2] = idx; | |
2700 | return rc; | |
2701 | } | |
2702 | ||
84920c14 | 2703 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2704 | struct netlink_callback *cb, |
2705 | struct neigh_dump_filter *filter) | |
84920c14 TZ |
2706 | { |
2707 | struct pneigh_entry *n; | |
2708 | struct net *net = sock_net(skb->sk); | |
2709 | int rc, h, s_h = cb->args[3]; | |
2710 | int idx, s_idx = idx = cb->args[4]; | |
6f52f80e DA |
2711 | unsigned int flags = NLM_F_MULTI; |
2712 | ||
2713 | if (filter->dev_idx || filter->master_idx) | |
2714 | flags |= NLM_F_DUMP_FILTERED; | |
84920c14 TZ |
2715 | |
2716 | read_lock_bh(&tbl->lock); | |
2717 | ||
4bd6683b | 2718 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2719 | if (h > s_h) |
2720 | s_idx = 0; | |
2721 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
18502acd | 2722 | if (idx < s_idx || pneigh_net(n) != net) |
84920c14 | 2723 | goto next; |
6f52f80e DA |
2724 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2725 | neigh_master_filtered(n->dev, filter->master_idx)) | |
2726 | goto next; | |
15e47304 | 2727 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 | 2728 | cb->nlh->nlmsg_seq, |
6f52f80e | 2729 | RTM_NEWNEIGH, flags, tbl) < 0) { |
84920c14 TZ |
2730 | read_unlock_bh(&tbl->lock); |
2731 | rc = -1; | |
2732 | goto out; | |
2733 | } | |
2734 | next: | |
2735 | idx++; | |
2736 | } | |
2737 | } | |
2738 | ||
2739 | read_unlock_bh(&tbl->lock); | |
2740 | rc = skb->len; | |
2741 | out: | |
2742 | cb->args[3] = h; | |
2743 | cb->args[4] = idx; | |
2744 | return rc; | |
2745 | ||
2746 | } | |
2747 | ||
51183d23 DA |
2748 | static int neigh_valid_dump_req(const struct nlmsghdr *nlh, |
2749 | bool strict_check, | |
2750 | struct neigh_dump_filter *filter, | |
2751 | struct netlink_ext_ack *extack) | |
2752 | { | |
2753 | struct nlattr *tb[NDA_MAX + 1]; | |
2754 | int err, i; | |
2755 | ||
2756 | if (strict_check) { | |
2757 | struct ndmsg *ndm; | |
2758 | ||
2759 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2760 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor dump request"); | |
2761 | return -EINVAL; | |
2762 | } | |
2763 | ||
2764 | ndm = nlmsg_data(nlh); | |
2765 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_ifindex || | |
c0fde870 | 2766 | ndm->ndm_state || ndm->ndm_type) { |
51183d23 DA |
2767 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor dump request"); |
2768 | return -EINVAL; | |
2769 | } | |
2770 | ||
c0fde870 DA |
2771 | if (ndm->ndm_flags & ~NTF_PROXY) { |
2772 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor dump request"); | |
2773 | return -EINVAL; | |
2774 | } | |
2775 | ||
8cb08174 JB |
2776 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), |
2777 | tb, NDA_MAX, nda_policy, | |
2778 | extack); | |
51183d23 | 2779 | } else { |
8cb08174 JB |
2780 | err = nlmsg_parse_deprecated(nlh, sizeof(struct ndmsg), tb, |
2781 | NDA_MAX, nda_policy, extack); | |
51183d23 DA |
2782 | } |
2783 | if (err < 0) | |
2784 | return err; | |
2785 | ||
2786 | for (i = 0; i <= NDA_MAX; ++i) { | |
2787 | if (!tb[i]) | |
2788 | continue; | |
2789 | ||
2790 | /* all new attributes should require strict_check */ | |
2791 | switch (i) { | |
2792 | case NDA_IFINDEX: | |
51183d23 DA |
2793 | filter->dev_idx = nla_get_u32(tb[i]); |
2794 | break; | |
2795 | case NDA_MASTER: | |
51183d23 DA |
2796 | filter->master_idx = nla_get_u32(tb[i]); |
2797 | break; | |
2798 | default: | |
2799 | if (strict_check) { | |
2800 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor dump request"); | |
2801 | return -EINVAL; | |
2802 | } | |
2803 | } | |
2804 | } | |
2805 | ||
2806 | return 0; | |
2807 | } | |
2808 | ||
c8822a4e | 2809 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2810 | { |
6f52f80e DA |
2811 | const struct nlmsghdr *nlh = cb->nlh; |
2812 | struct neigh_dump_filter filter = {}; | |
1da177e4 LT |
2813 | struct neigh_table *tbl; |
2814 | int t, family, s_t; | |
84920c14 | 2815 | int proxy = 0; |
4bd6683b | 2816 | int err; |
1da177e4 | 2817 | |
6f52f80e | 2818 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; |
84920c14 TZ |
2819 | |
2820 | /* check for full ndmsg structure presence, family member is | |
2821 | * the same for both structures | |
2822 | */ | |
6f52f80e DA |
2823 | if (nlmsg_len(nlh) >= sizeof(struct ndmsg) && |
2824 | ((struct ndmsg *)nlmsg_data(nlh))->ndm_flags == NTF_PROXY) | |
84920c14 TZ |
2825 | proxy = 1; |
2826 | ||
51183d23 DA |
2827 | err = neigh_valid_dump_req(nlh, cb->strict_check, &filter, cb->extack); |
2828 | if (err < 0 && cb->strict_check) | |
2829 | return err; | |
2830 | ||
1da177e4 LT |
2831 | s_t = cb->args[0]; |
2832 | ||
d7480fd3 WC |
2833 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2834 | tbl = neigh_tables[t]; | |
2835 | ||
2836 | if (!tbl) | |
2837 | continue; | |
1da177e4 LT |
2838 | if (t < s_t || (family && tbl->family != family)) |
2839 | continue; | |
2840 | if (t > s_t) | |
2841 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2842 | sizeof(cb->args[0])); | |
84920c14 | 2843 | if (proxy) |
6f52f80e | 2844 | err = pneigh_dump_table(tbl, skb, cb, &filter); |
84920c14 | 2845 | else |
6f52f80e | 2846 | err = neigh_dump_table(tbl, skb, cb, &filter); |
4bd6683b ED |
2847 | if (err < 0) |
2848 | break; | |
1da177e4 | 2849 | } |
1da177e4 LT |
2850 | |
2851 | cb->args[0] = t; | |
2852 | return skb->len; | |
2853 | } | |
2854 | ||
82cbb5c6 RP |
2855 | static int neigh_valid_get_req(const struct nlmsghdr *nlh, |
2856 | struct neigh_table **tbl, | |
2857 | void **dst, int *dev_idx, u8 *ndm_flags, | |
2858 | struct netlink_ext_ack *extack) | |
2859 | { | |
2860 | struct nlattr *tb[NDA_MAX + 1]; | |
2861 | struct ndmsg *ndm; | |
2862 | int err, i; | |
2863 | ||
2864 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2865 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request"); | |
2866 | return -EINVAL; | |
2867 | } | |
2868 | ||
2869 | ndm = nlmsg_data(nlh); | |
2870 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || | |
2871 | ndm->ndm_type) { | |
2872 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request"); | |
2873 | return -EINVAL; | |
2874 | } | |
2875 | ||
2876 | if (ndm->ndm_flags & ~NTF_PROXY) { | |
2877 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request"); | |
2878 | return -EINVAL; | |
2879 | } | |
2880 | ||
8cb08174 JB |
2881 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, |
2882 | NDA_MAX, nda_policy, extack); | |
82cbb5c6 RP |
2883 | if (err < 0) |
2884 | return err; | |
2885 | ||
2886 | *ndm_flags = ndm->ndm_flags; | |
2887 | *dev_idx = ndm->ndm_ifindex; | |
2888 | *tbl = neigh_find_table(ndm->ndm_family); | |
2889 | if (*tbl == NULL) { | |
2890 | NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request"); | |
2891 | return -EAFNOSUPPORT; | |
2892 | } | |
2893 | ||
2894 | for (i = 0; i <= NDA_MAX; ++i) { | |
2895 | if (!tb[i]) | |
2896 | continue; | |
2897 | ||
2898 | switch (i) { | |
2899 | case NDA_DST: | |
2900 | if (nla_len(tb[i]) != (int)(*tbl)->key_len) { | |
2901 | NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request"); | |
2902 | return -EINVAL; | |
2903 | } | |
2904 | *dst = nla_data(tb[i]); | |
2905 | break; | |
2906 | default: | |
2907 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request"); | |
2908 | return -EINVAL; | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | return 0; | |
2913 | } | |
2914 | ||
2915 | static inline size_t neigh_nlmsg_size(void) | |
2916 | { | |
2917 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2918 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2919 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2920 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2921 | + nla_total_size(4) /* NDA_PROBES */ | |
2c611ad9 | 2922 | + nla_total_size(4) /* NDA_FLAGS_EXT */ |
82cbb5c6 RP |
2923 | + nla_total_size(1); /* NDA_PROTOCOL */ |
2924 | } | |
2925 | ||
2926 | static int neigh_get_reply(struct net *net, struct neighbour *neigh, | |
2927 | u32 pid, u32 seq) | |
2928 | { | |
2929 | struct sk_buff *skb; | |
2930 | int err = 0; | |
2931 | ||
2932 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL); | |
2933 | if (!skb) | |
2934 | return -ENOBUFS; | |
2935 | ||
2936 | err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0); | |
2937 | if (err) { | |
2938 | kfree_skb(skb); | |
2939 | goto errout; | |
2940 | } | |
2941 | ||
2942 | err = rtnl_unicast(skb, net, pid); | |
2943 | errout: | |
2944 | return err; | |
2945 | } | |
2946 | ||
2947 | static inline size_t pneigh_nlmsg_size(void) | |
2948 | { | |
2949 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
463561e6 | 2950 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
2c611ad9 | 2951 | + nla_total_size(4) /* NDA_FLAGS_EXT */ |
82cbb5c6 RP |
2952 | + nla_total_size(1); /* NDA_PROTOCOL */ |
2953 | } | |
2954 | ||
2955 | static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh, | |
2956 | u32 pid, u32 seq, struct neigh_table *tbl) | |
2957 | { | |
2958 | struct sk_buff *skb; | |
2959 | int err = 0; | |
2960 | ||
2961 | skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL); | |
2962 | if (!skb) | |
2963 | return -ENOBUFS; | |
2964 | ||
2965 | err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl); | |
2966 | if (err) { | |
2967 | kfree_skb(skb); | |
2968 | goto errout; | |
2969 | } | |
2970 | ||
2971 | err = rtnl_unicast(skb, net, pid); | |
2972 | errout: | |
2973 | return err; | |
2974 | } | |
2975 | ||
2976 | static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, | |
2977 | struct netlink_ext_ack *extack) | |
2978 | { | |
2979 | struct net *net = sock_net(in_skb->sk); | |
2980 | struct net_device *dev = NULL; | |
2981 | struct neigh_table *tbl = NULL; | |
2982 | struct neighbour *neigh; | |
2983 | void *dst = NULL; | |
2984 | u8 ndm_flags = 0; | |
2985 | int dev_idx = 0; | |
2986 | int err; | |
2987 | ||
2988 | err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags, | |
2989 | extack); | |
2990 | if (err < 0) | |
2991 | return err; | |
2992 | ||
2993 | if (dev_idx) { | |
2994 | dev = __dev_get_by_index(net, dev_idx); | |
2995 | if (!dev) { | |
2996 | NL_SET_ERR_MSG(extack, "Unknown device ifindex"); | |
2997 | return -ENODEV; | |
2998 | } | |
2999 | } | |
3000 | ||
3001 | if (!dst) { | |
3002 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
3003 | return -EINVAL; | |
3004 | } | |
3005 | ||
3006 | if (ndm_flags & NTF_PROXY) { | |
3007 | struct pneigh_entry *pn; | |
3008 | ||
3009 | pn = pneigh_lookup(tbl, net, dst, dev, 0); | |
3010 | if (!pn) { | |
3011 | NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found"); | |
3012 | return -ENOENT; | |
3013 | } | |
3014 | return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid, | |
3015 | nlh->nlmsg_seq, tbl); | |
3016 | } | |
3017 | ||
3018 | if (!dev) { | |
3019 | NL_SET_ERR_MSG(extack, "No device specified"); | |
3020 | return -EINVAL; | |
3021 | } | |
3022 | ||
3023 | neigh = neigh_lookup(tbl, dst, dev); | |
3024 | if (!neigh) { | |
3025 | NL_SET_ERR_MSG(extack, "Neighbour entry not found"); | |
3026 | return -ENOENT; | |
3027 | } | |
3028 | ||
3029 | err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid, | |
3030 | nlh->nlmsg_seq); | |
3031 | ||
3032 | neigh_release(neigh); | |
3033 | ||
3034 | return err; | |
3035 | } | |
3036 | ||
1da177e4 LT |
3037 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
3038 | { | |
3039 | int chain; | |
d6bf7817 | 3040 | struct neigh_hash_table *nht; |
1da177e4 | 3041 | |
d6bf7817 ED |
3042 | rcu_read_lock_bh(); |
3043 | nht = rcu_dereference_bh(tbl->nht); | |
3044 | ||
767e97e1 | 3045 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 3046 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
3047 | struct neighbour *n; |
3048 | ||
767e97e1 ED |
3049 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
3050 | n != NULL; | |
3051 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
3052 | cb(n, cookie); |
3053 | } | |
d6bf7817 ED |
3054 | read_unlock(&tbl->lock); |
3055 | rcu_read_unlock_bh(); | |
1da177e4 LT |
3056 | } |
3057 | EXPORT_SYMBOL(neigh_for_each); | |
3058 | ||
3059 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
3060 | void __neigh_for_each_release(struct neigh_table *tbl, | |
3061 | int (*cb)(struct neighbour *)) | |
3062 | { | |
3063 | int chain; | |
d6bf7817 | 3064 | struct neigh_hash_table *nht; |
1da177e4 | 3065 | |
d6bf7817 ED |
3066 | nht = rcu_dereference_protected(tbl->nht, |
3067 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 3068 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
3069 | struct neighbour *n; |
3070 | struct neighbour __rcu **np; | |
1da177e4 | 3071 | |
d6bf7817 | 3072 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
3073 | while ((n = rcu_dereference_protected(*np, |
3074 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
3075 | int release; |
3076 | ||
3077 | write_lock(&n->lock); | |
3078 | release = cb(n); | |
3079 | if (release) { | |
767e97e1 ED |
3080 | rcu_assign_pointer(*np, |
3081 | rcu_dereference_protected(n->next, | |
3082 | lockdep_is_held(&tbl->lock))); | |
58956317 | 3083 | neigh_mark_dead(n); |
1da177e4 LT |
3084 | } else |
3085 | np = &n->next; | |
3086 | write_unlock(&n->lock); | |
4f494554 TG |
3087 | if (release) |
3088 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
3089 | } |
3090 | } | |
3091 | } | |
3092 | EXPORT_SYMBOL(__neigh_for_each_release); | |
3093 | ||
b79bda3d | 3094 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
3095 | const void *addr, struct sk_buff *skb) |
3096 | { | |
b79bda3d EB |
3097 | int err = -EAFNOSUPPORT; |
3098 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
3099 | struct neigh_table *tbl; |
3100 | struct neighbour *neigh; | |
3101 | ||
b79bda3d | 3102 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
3103 | if (!tbl) |
3104 | goto out; | |
b560f03d | 3105 | rcu_read_lock_bh(); |
4b2a2bfe DA |
3106 | if (index == NEIGH_ARP_TABLE) { |
3107 | u32 key = *((u32 *)addr); | |
3108 | ||
3109 | neigh = __ipv4_neigh_lookup_noref(dev, key); | |
3110 | } else { | |
3111 | neigh = __neigh_lookup_noref(tbl, addr, dev); | |
3112 | } | |
4fd3d7d9 EB |
3113 | if (!neigh) |
3114 | neigh = __neigh_create(tbl, addr, dev, false); | |
3115 | err = PTR_ERR(neigh); | |
b560f03d DB |
3116 | if (IS_ERR(neigh)) { |
3117 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 3118 | goto out_kfree_skb; |
b560f03d | 3119 | } |
4fd3d7d9 | 3120 | err = neigh->output(neigh, skb); |
b560f03d | 3121 | rcu_read_unlock_bh(); |
4fd3d7d9 | 3122 | } |
b79bda3d EB |
3123 | else if (index == NEIGH_LINK_TABLE) { |
3124 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
3125 | addr, NULL, skb->len); | |
3126 | if (err < 0) | |
3127 | goto out_kfree_skb; | |
3128 | err = dev_queue_xmit(skb); | |
3129 | } | |
4fd3d7d9 EB |
3130 | out: |
3131 | return err; | |
3132 | out_kfree_skb: | |
3133 | kfree_skb(skb); | |
3134 | goto out; | |
3135 | } | |
3136 | EXPORT_SYMBOL(neigh_xmit); | |
3137 | ||
1da177e4 LT |
3138 | #ifdef CONFIG_PROC_FS |
3139 | ||
3140 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
3141 | { | |
3142 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3143 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3144 | struct neigh_hash_table *nht = state->nht; |
1da177e4 | 3145 | struct neighbour *n = NULL; |
f530eed6 | 3146 | int bucket; |
1da177e4 LT |
3147 | |
3148 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 3149 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 3150 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
3151 | |
3152 | while (n) { | |
878628fb | 3153 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3154 | goto next; |
1da177e4 LT |
3155 | if (state->neigh_sub_iter) { |
3156 | loff_t fakep = 0; | |
3157 | void *v; | |
3158 | ||
3159 | v = state->neigh_sub_iter(state, n, &fakep); | |
3160 | if (!v) | |
3161 | goto next; | |
3162 | } | |
3163 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3164 | break; | |
3165 | if (n->nud_state & ~NUD_NOARP) | |
3166 | break; | |
767e97e1 ED |
3167 | next: |
3168 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3169 | } |
3170 | ||
3171 | if (n) | |
3172 | break; | |
3173 | } | |
3174 | state->bucket = bucket; | |
3175 | ||
3176 | return n; | |
3177 | } | |
3178 | ||
3179 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
3180 | struct neighbour *n, | |
3181 | loff_t *pos) | |
3182 | { | |
3183 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3184 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3185 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
3186 | |
3187 | if (state->neigh_sub_iter) { | |
3188 | void *v = state->neigh_sub_iter(state, n, pos); | |
3189 | if (v) | |
3190 | return n; | |
3191 | } | |
767e97e1 | 3192 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
3193 | |
3194 | while (1) { | |
3195 | while (n) { | |
878628fb | 3196 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3197 | goto next; |
1da177e4 LT |
3198 | if (state->neigh_sub_iter) { |
3199 | void *v = state->neigh_sub_iter(state, n, pos); | |
3200 | if (v) | |
3201 | return n; | |
3202 | goto next; | |
3203 | } | |
3204 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3205 | break; | |
3206 | ||
3207 | if (n->nud_state & ~NUD_NOARP) | |
3208 | break; | |
767e97e1 ED |
3209 | next: |
3210 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3211 | } |
3212 | ||
3213 | if (n) | |
3214 | break; | |
3215 | ||
cd089336 | 3216 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
3217 | break; |
3218 | ||
767e97e1 | 3219 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
3220 | } |
3221 | ||
3222 | if (n && pos) | |
3223 | --(*pos); | |
3224 | return n; | |
3225 | } | |
3226 | ||
3227 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3228 | { | |
3229 | struct neighbour *n = neigh_get_first(seq); | |
3230 | ||
3231 | if (n) { | |
745e2031 | 3232 | --(*pos); |
1da177e4 LT |
3233 | while (*pos) { |
3234 | n = neigh_get_next(seq, n, pos); | |
3235 | if (!n) | |
3236 | break; | |
3237 | } | |
3238 | } | |
3239 | return *pos ? NULL : n; | |
3240 | } | |
3241 | ||
3242 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
3243 | { | |
3244 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3245 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3246 | struct neigh_table *tbl = state->tbl; |
3247 | struct pneigh_entry *pn = NULL; | |
48de7c0c | 3248 | int bucket; |
1da177e4 LT |
3249 | |
3250 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
3251 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
3252 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 3253 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3254 | pn = pn->next; |
1da177e4 LT |
3255 | if (pn) |
3256 | break; | |
3257 | } | |
3258 | state->bucket = bucket; | |
3259 | ||
3260 | return pn; | |
3261 | } | |
3262 | ||
3263 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
3264 | struct pneigh_entry *pn, | |
3265 | loff_t *pos) | |
3266 | { | |
3267 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3268 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3269 | struct neigh_table *tbl = state->tbl; |
3270 | ||
df07a94c JBD |
3271 | do { |
3272 | pn = pn->next; | |
3273 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
3274 | ||
1da177e4 LT |
3275 | while (!pn) { |
3276 | if (++state->bucket > PNEIGH_HASHMASK) | |
3277 | break; | |
3278 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 3279 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3280 | pn = pn->next; |
1da177e4 LT |
3281 | if (pn) |
3282 | break; | |
3283 | } | |
3284 | ||
3285 | if (pn && pos) | |
3286 | --(*pos); | |
3287 | ||
3288 | return pn; | |
3289 | } | |
3290 | ||
3291 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3292 | { | |
3293 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
3294 | ||
3295 | if (pn) { | |
745e2031 | 3296 | --(*pos); |
1da177e4 LT |
3297 | while (*pos) { |
3298 | pn = pneigh_get_next(seq, pn, pos); | |
3299 | if (!pn) | |
3300 | break; | |
3301 | } | |
3302 | } | |
3303 | return *pos ? NULL : pn; | |
3304 | } | |
3305 | ||
3306 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
3307 | { | |
3308 | struct neigh_seq_state *state = seq->private; | |
3309 | void *rc; | |
745e2031 | 3310 | loff_t idxpos = *pos; |
1da177e4 | 3311 | |
745e2031 | 3312 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 3313 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 3314 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
3315 | |
3316 | return rc; | |
3317 | } | |
3318 | ||
3319 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
f3e92cb8 | 3320 | __acquires(tbl->lock) |
d6bf7817 | 3321 | __acquires(rcu_bh) |
1da177e4 LT |
3322 | { |
3323 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
3324 | |
3325 | state->tbl = tbl; | |
3326 | state->bucket = 0; | |
3327 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
3328 | ||
d6bf7817 ED |
3329 | rcu_read_lock_bh(); |
3330 | state->nht = rcu_dereference_bh(tbl->nht); | |
f3e92cb8 | 3331 | read_lock(&tbl->lock); |
767e97e1 | 3332 | |
745e2031 | 3333 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
3334 | } |
3335 | EXPORT_SYMBOL(neigh_seq_start); | |
3336 | ||
3337 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3338 | { | |
3339 | struct neigh_seq_state *state; | |
3340 | void *rc; | |
3341 | ||
3342 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 3343 | rc = neigh_get_first(seq); |
1da177e4 LT |
3344 | goto out; |
3345 | } | |
3346 | ||
3347 | state = seq->private; | |
3348 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
3349 | rc = neigh_get_next(seq, v, NULL); | |
3350 | if (rc) | |
3351 | goto out; | |
3352 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
3353 | rc = pneigh_get_first(seq); | |
3354 | } else { | |
3355 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
3356 | rc = pneigh_get_next(seq, v, NULL); | |
3357 | } | |
3358 | out: | |
3359 | ++(*pos); | |
3360 | return rc; | |
3361 | } | |
3362 | EXPORT_SYMBOL(neigh_seq_next); | |
3363 | ||
3364 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
f3e92cb8 | 3365 | __releases(tbl->lock) |
d6bf7817 | 3366 | __releases(rcu_bh) |
1da177e4 | 3367 | { |
f3e92cb8 ED |
3368 | struct neigh_seq_state *state = seq->private; |
3369 | struct neigh_table *tbl = state->tbl; | |
3370 | ||
3371 | read_unlock(&tbl->lock); | |
d6bf7817 | 3372 | rcu_read_unlock_bh(); |
1da177e4 LT |
3373 | } |
3374 | EXPORT_SYMBOL(neigh_seq_stop); | |
3375 | ||
3376 | /* statistics via seq_file */ | |
3377 | ||
3378 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
3379 | { | |
359745d7 | 3380 | struct neigh_table *tbl = pde_data(file_inode(seq->file)); |
1da177e4 LT |
3381 | int cpu; |
3382 | ||
3383 | if (*pos == 0) | |
3384 | return SEQ_START_TOKEN; | |
4ec93edb | 3385 | |
0f23174a | 3386 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3387 | if (!cpu_possible(cpu)) |
3388 | continue; | |
3389 | *pos = cpu+1; | |
3390 | return per_cpu_ptr(tbl->stats, cpu); | |
3391 | } | |
3392 | return NULL; | |
3393 | } | |
3394 | ||
3395 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3396 | { | |
359745d7 | 3397 | struct neigh_table *tbl = pde_data(file_inode(seq->file)); |
1da177e4 LT |
3398 | int cpu; |
3399 | ||
0f23174a | 3400 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3401 | if (!cpu_possible(cpu)) |
3402 | continue; | |
3403 | *pos = cpu+1; | |
3404 | return per_cpu_ptr(tbl->stats, cpu); | |
3405 | } | |
1e3f9f07 | 3406 | (*pos)++; |
1da177e4 LT |
3407 | return NULL; |
3408 | } | |
3409 | ||
3410 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
3411 | { | |
3412 | ||
3413 | } | |
3414 | ||
3415 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
3416 | { | |
359745d7 | 3417 | struct neigh_table *tbl = pde_data(file_inode(seq->file)); |
1da177e4 LT |
3418 | struct neigh_statistics *st = v; |
3419 | ||
3420 | if (v == SEQ_START_TOKEN) { | |
0547ffe6 | 3421 | seq_puts(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 |
3422 | return 0; |
3423 | } | |
3424 | ||
0547ffe6 YD |
3425 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " |
3426 | "%08lx %08lx %08lx " | |
3427 | "%08lx %08lx %08lx\n", | |
1da177e4 LT |
3428 | atomic_read(&tbl->entries), |
3429 | ||
3430 | st->allocs, | |
3431 | st->destroys, | |
3432 | st->hash_grows, | |
3433 | ||
3434 | st->lookups, | |
3435 | st->hits, | |
3436 | ||
3437 | st->res_failed, | |
3438 | ||
3439 | st->rcv_probes_mcast, | |
3440 | st->rcv_probes_ucast, | |
3441 | ||
3442 | st->periodic_gc_runs, | |
9a6d276e | 3443 | st->forced_gc_runs, |
fb811395 RJ |
3444 | st->unres_discards, |
3445 | st->table_fulls | |
1da177e4 LT |
3446 | ); |
3447 | ||
3448 | return 0; | |
3449 | } | |
3450 | ||
f690808e | 3451 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
3452 | .start = neigh_stat_seq_start, |
3453 | .next = neigh_stat_seq_next, | |
3454 | .stop = neigh_stat_seq_stop, | |
3455 | .show = neigh_stat_seq_show, | |
3456 | }; | |
1da177e4 LT |
3457 | #endif /* CONFIG_PROC_FS */ |
3458 | ||
7b8f7a40 RP |
3459 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
3460 | u32 pid) | |
1da177e4 | 3461 | { |
c346dca1 | 3462 | struct net *net = dev_net(n->dev); |
8b8aec50 | 3463 | struct sk_buff *skb; |
b8673311 | 3464 | int err = -ENOBUFS; |
1da177e4 | 3465 | |
339bf98f | 3466 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 3467 | if (skb == NULL) |
b8673311 | 3468 | goto errout; |
1da177e4 | 3469 | |
7b8f7a40 | 3470 | err = neigh_fill_info(skb, n, pid, 0, type, flags); |
26932566 PM |
3471 | if (err < 0) { |
3472 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
3473 | WARN_ON(err == -EMSGSIZE); | |
3474 | kfree_skb(skb); | |
3475 | goto errout; | |
3476 | } | |
1ce85fe4 PNA |
3477 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
3478 | return; | |
b8673311 TG |
3479 | errout: |
3480 | if (err < 0) | |
426b5303 | 3481 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
3482 | } |
3483 | ||
b8673311 | 3484 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 3485 | { |
7b8f7a40 | 3486 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0); |
b8673311 | 3487 | } |
0a204500 | 3488 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
3489 | |
3490 | #ifdef CONFIG_SYSCTL | |
b93196dc | 3491 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 3492 | |
fe2c6338 | 3493 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
32927393 | 3494 | void *buffer, size_t *lenp, loff_t *ppos) |
8b5c171b ED |
3495 | { |
3496 | int size, ret; | |
fe2c6338 | 3497 | struct ctl_table tmp = *ctl; |
8b5c171b | 3498 | |
eec4844f | 3499 | tmp.extra1 = SYSCTL_ZERO; |
ce46cc64 | 3500 | tmp.extra2 = &unres_qlen_max; |
8b5c171b | 3501 | tmp.data = &size; |
ce46cc64 SW |
3502 | |
3503 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
3504 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
3505 | ||
8b5c171b ED |
3506 | if (write && !ret) |
3507 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
3508 | return ret; | |
3509 | } | |
3510 | ||
1d4c8c29 JP |
3511 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
3512 | int family) | |
3513 | { | |
bba24896 JP |
3514 | switch (family) { |
3515 | case AF_INET: | |
1d4c8c29 | 3516 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
3517 | case AF_INET6: |
3518 | return __in6_dev_nd_parms_get_rcu(dev); | |
3519 | } | |
1d4c8c29 JP |
3520 | return NULL; |
3521 | } | |
3522 | ||
3523 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
3524 | int index) | |
3525 | { | |
3526 | struct net_device *dev; | |
3527 | int family = neigh_parms_family(p); | |
3528 | ||
3529 | rcu_read_lock(); | |
3530 | for_each_netdev_rcu(net, dev) { | |
3531 | struct neigh_parms *dst_p = | |
3532 | neigh_get_dev_parms_rcu(dev, family); | |
3533 | ||
3534 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
3535 | dst_p->data[index] = p->data[index]; | |
3536 | } | |
3537 | rcu_read_unlock(); | |
3538 | } | |
3539 | ||
3540 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
3541 | { | |
3542 | struct net_device *dev = ctl->extra1; | |
3543 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 3544 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
3545 | int index = (int *) ctl->data - p->data; |
3546 | ||
3547 | if (!write) | |
3548 | return; | |
3549 | ||
3550 | set_bit(index, p->data_state); | |
7627ae60 MH |
3551 | if (index == NEIGH_VAR_DELAY_PROBE_TIME) |
3552 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); | |
1d4c8c29 JP |
3553 | if (!dev) /* NULL dev means this is default value */ |
3554 | neigh_copy_dflt_parms(net, p, index); | |
3555 | } | |
3556 | ||
1f9248e5 | 3557 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
32927393 CH |
3558 | void *buffer, size_t *lenp, |
3559 | loff_t *ppos) | |
1f9248e5 JP |
3560 | { |
3561 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 3562 | int ret; |
1f9248e5 | 3563 | |
eec4844f MC |
3564 | tmp.extra1 = SYSCTL_ZERO; |
3565 | tmp.extra2 = SYSCTL_INT_MAX; | |
1f9248e5 | 3566 | |
1d4c8c29 JP |
3567 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
3568 | neigh_proc_update(ctl, write); | |
3569 | return ret; | |
1f9248e5 JP |
3570 | } |
3571 | ||
211da42e YW |
3572 | static int neigh_proc_dointvec_ms_jiffies_positive(struct ctl_table *ctl, int write, |
3573 | void *buffer, size_t *lenp, loff_t *ppos) | |
3574 | { | |
3575 | struct ctl_table tmp = *ctl; | |
3576 | int ret; | |
3577 | ||
3578 | int min = msecs_to_jiffies(1); | |
3579 | ||
3580 | tmp.extra1 = &min; | |
3581 | tmp.extra2 = NULL; | |
3582 | ||
3583 | ret = proc_dointvec_ms_jiffies_minmax(&tmp, write, buffer, lenp, ppos); | |
3584 | neigh_proc_update(ctl, write); | |
3585 | return ret; | |
3586 | } | |
3587 | ||
32927393 CH |
3588 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, void *buffer, |
3589 | size_t *lenp, loff_t *ppos) | |
cb5b09c1 | 3590 | { |
1d4c8c29 JP |
3591 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
3592 | ||
3593 | neigh_proc_update(ctl, write); | |
3594 | return ret; | |
cb5b09c1 JP |
3595 | } |
3596 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
3597 | ||
32927393 | 3598 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, void *buffer, |
cb5b09c1 JP |
3599 | size_t *lenp, loff_t *ppos) |
3600 | { | |
1d4c8c29 JP |
3601 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
3602 | ||
3603 | neigh_proc_update(ctl, write); | |
3604 | return ret; | |
cb5b09c1 JP |
3605 | } |
3606 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
3607 | ||
3608 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
32927393 CH |
3609 | void *buffer, size_t *lenp, |
3610 | loff_t *ppos) | |
cb5b09c1 | 3611 | { |
1d4c8c29 JP |
3612 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
3613 | ||
3614 | neigh_proc_update(ctl, write); | |
3615 | return ret; | |
cb5b09c1 JP |
3616 | } |
3617 | ||
3618 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
32927393 | 3619 | void *buffer, size_t *lenp, loff_t *ppos) |
cb5b09c1 | 3620 | { |
1d4c8c29 JP |
3621 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
3622 | ||
3623 | neigh_proc_update(ctl, write); | |
3624 | return ret; | |
cb5b09c1 JP |
3625 | } |
3626 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
3627 | ||
3628 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
32927393 CH |
3629 | void *buffer, size_t *lenp, |
3630 | loff_t *ppos) | |
cb5b09c1 | 3631 | { |
1d4c8c29 JP |
3632 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
3633 | ||
3634 | neigh_proc_update(ctl, write); | |
3635 | return ret; | |
cb5b09c1 JP |
3636 | } |
3637 | ||
4bf6980d | 3638 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
32927393 CH |
3639 | void *buffer, size_t *lenp, |
3640 | loff_t *ppos) | |
4bf6980d JFR |
3641 | { |
3642 | struct neigh_parms *p = ctl->extra2; | |
3643 | int ret; | |
3644 | ||
3645 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3646 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3647 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3648 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3649 | else | |
3650 | ret = -1; | |
3651 | ||
3652 | if (write && ret == 0) { | |
3653 | /* update reachable_time as well, otherwise, the change will | |
3654 | * only be effective after the next time neigh_periodic_work | |
3655 | * decides to recompute it | |
3656 | */ | |
3657 | p->reachable_time = | |
3658 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3659 | } | |
3660 | return ret; | |
3661 | } | |
3662 | ||
1f9248e5 JP |
3663 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3664 | (&((struct neigh_parms *) 0)->data[index]) | |
3665 | ||
3666 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3667 | [NEIGH_VAR_ ## attr] = { \ | |
3668 | .procname = name, \ | |
3669 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3670 | .maxlen = sizeof(int), \ | |
3671 | .mode = mval, \ | |
3672 | .proc_handler = proc, \ | |
3673 | } | |
3674 | ||
3675 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3676 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3677 | ||
3678 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3679 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3680 | |
3681 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3682 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 | 3683 | |
211da42e YW |
3684 | #define NEIGH_SYSCTL_MS_JIFFIES_POSITIVE_ENTRY(attr, name) \ |
3685 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies_positive) | |
3686 | ||
1f9248e5 | 3687 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ |
cb5b09c1 | 3688 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3689 | |
3690 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3691 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3692 | |
1da177e4 LT |
3693 | static struct neigh_sysctl_table { |
3694 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3695 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3696 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3697 | .neigh_vars = { |
1f9248e5 JP |
3698 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3699 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3700 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3701 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3702 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3703 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3704 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
211da42e YW |
3705 | NEIGH_SYSCTL_MS_JIFFIES_POSITIVE_ENTRY(INTERVAL_PROBE_TIME_MS, |
3706 | "interval_probe_time_ms"), | |
1f9248e5 JP |
3707 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), |
3708 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3709 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3710 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3711 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3712 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3713 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3714 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3715 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3716 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3717 | .procname = "gc_interval", |
3718 | .maxlen = sizeof(int), | |
3719 | .mode = 0644, | |
6d9f239a | 3720 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3721 | }, |
8b5c171b | 3722 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3723 | .procname = "gc_thresh1", |
3724 | .maxlen = sizeof(int), | |
3725 | .mode = 0644, | |
eec4844f MC |
3726 | .extra1 = SYSCTL_ZERO, |
3727 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3728 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3729 | }, |
8b5c171b | 3730 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3731 | .procname = "gc_thresh2", |
3732 | .maxlen = sizeof(int), | |
3733 | .mode = 0644, | |
eec4844f MC |
3734 | .extra1 = SYSCTL_ZERO, |
3735 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3736 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3737 | }, |
8b5c171b | 3738 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3739 | .procname = "gc_thresh3", |
3740 | .maxlen = sizeof(int), | |
3741 | .mode = 0644, | |
eec4844f MC |
3742 | .extra1 = SYSCTL_ZERO, |
3743 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3744 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3745 | }, |
c3bac5a7 | 3746 | {}, |
1da177e4 LT |
3747 | }, |
3748 | }; | |
3749 | ||
3750 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3751 | proc_handler *handler) |
1da177e4 | 3752 | { |
1f9248e5 | 3753 | int i; |
3c607bbb | 3754 | struct neigh_sysctl_table *t; |
1f9248e5 | 3755 | const char *dev_name_source; |
8f40a1f9 | 3756 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3757 | char *p_name; |
1da177e4 | 3758 | |
425b9c7f | 3759 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL_ACCOUNT); |
1da177e4 | 3760 | if (!t) |
3c607bbb PE |
3761 | goto err; |
3762 | ||
b194c1f1 | 3763 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3764 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3765 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3766 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3767 | } |
1da177e4 LT |
3768 | |
3769 | if (dev) { | |
3770 | dev_name_source = dev->name; | |
d12af679 | 3771 | /* Terminate the table early */ |
8b5c171b ED |
3772 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3773 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3774 | } else { |
9ecf07a1 | 3775 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3776 | dev_name_source = "default"; |
9ecf07a1 MK |
3777 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3778 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3779 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3780 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3781 | } |
3782 | ||
f8572d8f | 3783 | if (handler) { |
1da177e4 | 3784 | /* RetransTime */ |
8b5c171b | 3785 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3786 | /* ReachableTime */ |
8b5c171b | 3787 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3788 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3789 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3790 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3791 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3792 | } else { |
3793 | /* Those handlers will update p->reachable_time after | |
3794 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3795 | * applied after the next neighbour update instead of waiting for | |
3796 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3797 | * So any handler that replaces them should do this as well | |
3798 | */ | |
3799 | /* ReachableTime */ | |
3800 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3801 | neigh_proc_base_reachable_time; | |
3802 | /* ReachableTime (in milliseconds) */ | |
3803 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3804 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3805 | } |
3806 | ||
73af614a JP |
3807 | switch (neigh_parms_family(p)) { |
3808 | case AF_INET: | |
3809 | p_name = "ipv4"; | |
3810 | break; | |
3811 | case AF_INET6: | |
3812 | p_name = "ipv6"; | |
3813 | break; | |
3814 | default: | |
3815 | BUG(); | |
3816 | } | |
3817 | ||
8f40a1f9 EB |
3818 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3819 | p_name, dev_name_source); | |
4ab438fc | 3820 | t->sysctl_header = |
8f40a1f9 | 3821 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3822 | if (!t->sysctl_header) |
8f40a1f9 | 3823 | goto free; |
3c607bbb | 3824 | |
1da177e4 LT |
3825 | p->sysctl_table = t; |
3826 | return 0; | |
3827 | ||
3c607bbb | 3828 | free: |
1da177e4 | 3829 | kfree(t); |
3c607bbb PE |
3830 | err: |
3831 | return -ENOBUFS; | |
1da177e4 | 3832 | } |
0a204500 | 3833 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3834 | |
3835 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3836 | { | |
3837 | if (p->sysctl_table) { | |
3838 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3839 | p->sysctl_table = NULL; | |
5dd3df10 | 3840 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3841 | kfree(t); |
3842 | } | |
3843 | } | |
0a204500 | 3844 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3845 | |
3846 | #endif /* CONFIG_SYSCTL */ | |
3847 | ||
c8822a4e TG |
3848 | static int __init neigh_init(void) |
3849 | { | |
b97bac64 FW |
3850 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0); |
3851 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0); | |
82cbb5c6 | 3852 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0); |
c8822a4e | 3853 | |
c7ac8679 | 3854 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
b97bac64 FW |
3855 | 0); |
3856 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, 0); | |
c8822a4e TG |
3857 | |
3858 | return 0; | |
3859 | } | |
3860 | ||
3861 | subsys_initcall(neigh_init); |