]>
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 | ||
d5d427cd | 44 | #define DEBUG |
1da177e4 | 45 | #define NEIGH_DEBUG 1 |
d5d427cd JP |
46 | #define neigh_dbg(level, fmt, ...) \ |
47 | do { \ | |
48 | if (level <= NEIGH_DEBUG) \ | |
49 | pr_debug(fmt, ##__VA_ARGS__); \ | |
50 | } while (0) | |
1da177e4 LT |
51 | |
52 | #define PNEIGH_HASHMASK 0xF | |
53 | ||
e99e88a9 | 54 | static void neigh_timer_handler(struct timer_list *t); |
7b8f7a40 RP |
55 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
56 | u32 pid); | |
57 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid); | |
53b76cdf WB |
58 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
59 | struct net_device *dev); | |
1da177e4 | 60 | |
45fc3b11 | 61 | #ifdef CONFIG_PROC_FS |
71a5053a | 62 | static const struct seq_operations neigh_stat_seq_ops; |
45fc3b11 | 63 | #endif |
1da177e4 LT |
64 | |
65 | /* | |
66 | Neighbour hash table buckets are protected with rwlock tbl->lock. | |
67 | ||
68 | - All the scans/updates to hash buckets MUST be made under this lock. | |
69 | - NOTHING clever should be made under this lock: no callbacks | |
70 | to protocol backends, no attempts to send something to network. | |
71 | It will result in deadlocks, if backend/driver wants to use neighbour | |
72 | cache. | |
73 | - If the entry requires some non-trivial actions, increase | |
74 | its reference count and release table lock. | |
75 | ||
76 | Neighbour entries are protected: | |
77 | - with reference count. | |
78 | - with rwlock neigh->lock | |
79 | ||
80 | Reference count prevents destruction. | |
81 | ||
82 | neigh->lock mainly serializes ll address data and its validity state. | |
83 | However, the same lock is used to protect another entry fields: | |
84 | - timer | |
85 | - resolution queue | |
86 | ||
87 | Again, nothing clever shall be made under neigh->lock, | |
88 | the most complicated procedure, which we allow is dev->hard_header. | |
89 | It is supposed, that dev->hard_header is simplistic and does | |
90 | not make callbacks to neighbour tables. | |
1da177e4 LT |
91 | */ |
92 | ||
8f40b161 | 93 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 LT |
94 | { |
95 | kfree_skb(skb); | |
96 | return -ENETDOWN; | |
97 | } | |
98 | ||
4f494554 TG |
99 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
100 | { | |
56dd18a4 | 101 | trace_neigh_cleanup_and_release(neigh, 0); |
7b8f7a40 | 102 | __neigh_notify(neigh, RTM_DELNEIGH, 0, 0); |
53f800e3 | 103 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
4f494554 TG |
104 | neigh_release(neigh); |
105 | } | |
106 | ||
1da177e4 LT |
107 | /* |
108 | * It is random distribution in the interval (1/2)*base...(3/2)*base. | |
109 | * It corresponds to default IPv6 settings and is not overridable, | |
110 | * because it is really reasonable choice. | |
111 | */ | |
112 | ||
113 | unsigned long neigh_rand_reach_time(unsigned long base) | |
114 | { | |
63862b5b | 115 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
1da177e4 | 116 | } |
0a204500 | 117 | EXPORT_SYMBOL(neigh_rand_reach_time); |
1da177e4 | 118 | |
58956317 DA |
119 | static void neigh_mark_dead(struct neighbour *n) |
120 | { | |
121 | n->dead = 1; | |
122 | if (!list_empty(&n->gc_list)) { | |
123 | list_del_init(&n->gc_list); | |
124 | atomic_dec(&n->tbl->gc_entries); | |
125 | } | |
126 | } | |
127 | ||
9c29a2f5 | 128 | static void neigh_update_gc_list(struct neighbour *n) |
58956317 | 129 | { |
e997f8a2 | 130 | bool on_gc_list, exempt_from_gc; |
58956317 | 131 | |
9c29a2f5 DA |
132 | write_lock_bh(&n->tbl->lock); |
133 | write_lock(&n->lock); | |
58956317 | 134 | |
e997f8a2 DA |
135 | /* remove from the gc list if new state is permanent or if neighbor |
136 | * is externally learned; otherwise entry should be on the gc list | |
58956317 | 137 | */ |
e997f8a2 DA |
138 | exempt_from_gc = n->nud_state & NUD_PERMANENT || |
139 | n->flags & NTF_EXT_LEARNED; | |
9c29a2f5 DA |
140 | on_gc_list = !list_empty(&n->gc_list); |
141 | ||
e997f8a2 | 142 | if (exempt_from_gc && on_gc_list) { |
58956317 DA |
143 | list_del_init(&n->gc_list); |
144 | atomic_dec(&n->tbl->gc_entries); | |
e997f8a2 | 145 | } else if (!exempt_from_gc && !on_gc_list) { |
58956317 DA |
146 | /* add entries to the tail; cleaning removes from the front */ |
147 | list_add_tail(&n->gc_list, &n->tbl->gc_list); | |
148 | atomic_inc(&n->tbl->gc_entries); | |
149 | } | |
9c29a2f5 DA |
150 | |
151 | write_unlock(&n->lock); | |
152 | write_unlock_bh(&n->tbl->lock); | |
58956317 | 153 | } |
1da177e4 | 154 | |
e997f8a2 | 155 | static bool neigh_update_ext_learned(struct neighbour *neigh, u32 flags, |
526f1b58 DA |
156 | int *notify) |
157 | { | |
e997f8a2 | 158 | bool rc = false; |
526f1b58 DA |
159 | u8 ndm_flags; |
160 | ||
161 | if (!(flags & NEIGH_UPDATE_F_ADMIN)) | |
e997f8a2 | 162 | return rc; |
526f1b58 DA |
163 | |
164 | ndm_flags = (flags & NEIGH_UPDATE_F_EXT_LEARNED) ? NTF_EXT_LEARNED : 0; | |
165 | if ((neigh->flags ^ ndm_flags) & NTF_EXT_LEARNED) { | |
166 | if (ndm_flags & NTF_EXT_LEARNED) | |
167 | neigh->flags |= NTF_EXT_LEARNED; | |
168 | else | |
169 | neigh->flags &= ~NTF_EXT_LEARNED; | |
e997f8a2 | 170 | rc = true; |
526f1b58 DA |
171 | *notify = 1; |
172 | } | |
e997f8a2 DA |
173 | |
174 | return rc; | |
526f1b58 DA |
175 | } |
176 | ||
7e6f182b DA |
177 | static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np, |
178 | struct neigh_table *tbl) | |
5071034e SV |
179 | { |
180 | bool retval = false; | |
181 | ||
182 | write_lock(&n->lock); | |
7e6f182b | 183 | if (refcount_read(&n->refcnt) == 1) { |
5071034e SV |
184 | struct neighbour *neigh; |
185 | ||
186 | neigh = rcu_dereference_protected(n->next, | |
187 | lockdep_is_held(&tbl->lock)); | |
188 | rcu_assign_pointer(*np, neigh); | |
58956317 | 189 | neigh_mark_dead(n); |
5071034e SV |
190 | retval = true; |
191 | } | |
192 | write_unlock(&n->lock); | |
193 | if (retval) | |
194 | neigh_cleanup_and_release(n); | |
195 | return retval; | |
196 | } | |
197 | ||
198 | bool neigh_remove_one(struct neighbour *ndel, struct neigh_table *tbl) | |
199 | { | |
200 | struct neigh_hash_table *nht; | |
201 | void *pkey = ndel->primary_key; | |
202 | u32 hash_val; | |
203 | struct neighbour *n; | |
204 | struct neighbour __rcu **np; | |
205 | ||
206 | nht = rcu_dereference_protected(tbl->nht, | |
207 | lockdep_is_held(&tbl->lock)); | |
208 | hash_val = tbl->hash(pkey, ndel->dev, nht->hash_rnd); | |
209 | hash_val = hash_val >> (32 - nht->hash_shift); | |
210 | ||
211 | np = &nht->hash_buckets[hash_val]; | |
212 | while ((n = rcu_dereference_protected(*np, | |
213 | lockdep_is_held(&tbl->lock)))) { | |
214 | if (n == ndel) | |
7e6f182b | 215 | return neigh_del(n, np, tbl); |
5071034e SV |
216 | np = &n->next; |
217 | } | |
218 | return false; | |
219 | } | |
220 | ||
1da177e4 LT |
221 | static int neigh_forced_gc(struct neigh_table *tbl) |
222 | { | |
58956317 DA |
223 | int max_clean = atomic_read(&tbl->gc_entries) - tbl->gc_thresh2; |
224 | unsigned long tref = jiffies - 5 * HZ; | |
58956317 | 225 | struct neighbour *n, *tmp; |
1da177e4 | 226 | int shrunk = 0; |
1da177e4 LT |
227 | |
228 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); | |
229 | ||
230 | write_lock_bh(&tbl->lock); | |
1da177e4 | 231 | |
58956317 DA |
232 | list_for_each_entry_safe(n, tmp, &tbl->gc_list, gc_list) { |
233 | if (refcount_read(&n->refcnt) == 1) { | |
234 | bool remove = false; | |
235 | ||
236 | write_lock(&n->lock); | |
758a7f0b | 237 | if ((n->nud_state == NUD_FAILED) || |
e997f8a2 | 238 | time_after(tref, n->updated)) |
58956317 DA |
239 | remove = true; |
240 | write_unlock(&n->lock); | |
241 | ||
242 | if (remove && neigh_remove_one(n, tbl)) | |
243 | shrunk++; | |
244 | if (shrunk >= max_clean) | |
245 | break; | |
1da177e4 LT |
246 | } |
247 | } | |
248 | ||
249 | tbl->last_flush = jiffies; | |
250 | ||
251 | write_unlock_bh(&tbl->lock); | |
252 | ||
253 | return shrunk; | |
254 | } | |
255 | ||
a43d8994 PE |
256 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
257 | { | |
258 | neigh_hold(n); | |
259 | if (unlikely(mod_timer(&n->timer, when))) { | |
260 | printk("NEIGH: BUG, double timer add, state is %x\n", | |
261 | n->nud_state); | |
262 | dump_stack(); | |
263 | } | |
264 | } | |
265 | ||
1da177e4 LT |
266 | static int neigh_del_timer(struct neighbour *n) |
267 | { | |
268 | if ((n->nud_state & NUD_IN_TIMER) && | |
269 | del_timer(&n->timer)) { | |
270 | neigh_release(n); | |
271 | return 1; | |
272 | } | |
273 | return 0; | |
274 | } | |
275 | ||
276 | static void pneigh_queue_purge(struct sk_buff_head *list) | |
277 | { | |
278 | struct sk_buff *skb; | |
279 | ||
280 | while ((skb = skb_dequeue(list)) != NULL) { | |
281 | dev_put(skb->dev); | |
282 | kfree_skb(skb); | |
283 | } | |
284 | } | |
285 | ||
859bd2ef DA |
286 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev, |
287 | bool skip_perm) | |
1da177e4 LT |
288 | { |
289 | int i; | |
d6bf7817 | 290 | struct neigh_hash_table *nht; |
1da177e4 | 291 | |
d6bf7817 ED |
292 | nht = rcu_dereference_protected(tbl->nht, |
293 | lockdep_is_held(&tbl->lock)); | |
294 | ||
cd089336 | 295 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
767e97e1 ED |
296 | struct neighbour *n; |
297 | struct neighbour __rcu **np = &nht->hash_buckets[i]; | |
1da177e4 | 298 | |
767e97e1 ED |
299 | while ((n = rcu_dereference_protected(*np, |
300 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
301 | if (dev && n->dev != dev) { |
302 | np = &n->next; | |
303 | continue; | |
304 | } | |
859bd2ef DA |
305 | if (skip_perm && n->nud_state & NUD_PERMANENT) { |
306 | np = &n->next; | |
307 | continue; | |
308 | } | |
767e97e1 ED |
309 | rcu_assign_pointer(*np, |
310 | rcu_dereference_protected(n->next, | |
311 | lockdep_is_held(&tbl->lock))); | |
1da177e4 LT |
312 | write_lock(&n->lock); |
313 | neigh_del_timer(n); | |
58956317 | 314 | neigh_mark_dead(n); |
9f237430 | 315 | if (refcount_read(&n->refcnt) != 1) { |
1da177e4 LT |
316 | /* The most unpleasant situation. |
317 | We must destroy neighbour entry, | |
318 | but someone still uses it. | |
319 | ||
320 | The destroy will be delayed until | |
321 | the last user releases us, but | |
322 | we must kill timers etc. and move | |
323 | it to safe state. | |
324 | */ | |
c9ab4d85 | 325 | __skb_queue_purge(&n->arp_queue); |
8b5c171b | 326 | n->arp_queue_len_bytes = 0; |
1da177e4 LT |
327 | n->output = neigh_blackhole; |
328 | if (n->nud_state & NUD_VALID) | |
329 | n->nud_state = NUD_NOARP; | |
330 | else | |
331 | n->nud_state = NUD_NONE; | |
d5d427cd | 332 | neigh_dbg(2, "neigh %p is stray\n", n); |
1da177e4 LT |
333 | } |
334 | write_unlock(&n->lock); | |
4f494554 | 335 | neigh_cleanup_and_release(n); |
1da177e4 LT |
336 | } |
337 | } | |
49636bb1 | 338 | } |
1da177e4 | 339 | |
49636bb1 HX |
340 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
341 | { | |
342 | write_lock_bh(&tbl->lock); | |
859bd2ef | 343 | neigh_flush_dev(tbl, dev, false); |
49636bb1 HX |
344 | write_unlock_bh(&tbl->lock); |
345 | } | |
0a204500 | 346 | EXPORT_SYMBOL(neigh_changeaddr); |
49636bb1 | 347 | |
859bd2ef DA |
348 | static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev, |
349 | bool skip_perm) | |
49636bb1 HX |
350 | { |
351 | write_lock_bh(&tbl->lock); | |
859bd2ef | 352 | neigh_flush_dev(tbl, dev, skip_perm); |
53b76cdf | 353 | pneigh_ifdown_and_unlock(tbl, dev); |
1da177e4 LT |
354 | |
355 | del_timer_sync(&tbl->proxy_timer); | |
356 | pneigh_queue_purge(&tbl->proxy_queue); | |
357 | return 0; | |
358 | } | |
859bd2ef DA |
359 | |
360 | int neigh_carrier_down(struct neigh_table *tbl, struct net_device *dev) | |
361 | { | |
362 | __neigh_ifdown(tbl, dev, true); | |
363 | return 0; | |
364 | } | |
365 | EXPORT_SYMBOL(neigh_carrier_down); | |
366 | ||
367 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) | |
368 | { | |
369 | __neigh_ifdown(tbl, dev, false); | |
370 | return 0; | |
371 | } | |
0a204500 | 372 | EXPORT_SYMBOL(neigh_ifdown); |
1da177e4 | 373 | |
58956317 DA |
374 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, |
375 | struct net_device *dev, | |
e997f8a2 | 376 | bool exempt_from_gc) |
1da177e4 LT |
377 | { |
378 | struct neighbour *n = NULL; | |
379 | unsigned long now = jiffies; | |
380 | int entries; | |
381 | ||
e997f8a2 | 382 | if (exempt_from_gc) |
58956317 DA |
383 | goto do_alloc; |
384 | ||
385 | entries = atomic_inc_return(&tbl->gc_entries) - 1; | |
1da177e4 LT |
386 | if (entries >= tbl->gc_thresh3 || |
387 | (entries >= tbl->gc_thresh2 && | |
388 | time_after(now, tbl->last_flush + 5 * HZ))) { | |
389 | if (!neigh_forced_gc(tbl) && | |
fb811395 RJ |
390 | entries >= tbl->gc_thresh3) { |
391 | net_info_ratelimited("%s: neighbor table overflow!\n", | |
392 | tbl->id); | |
393 | NEIGH_CACHE_STAT_INC(tbl, table_fulls); | |
1da177e4 | 394 | goto out_entries; |
fb811395 | 395 | } |
1da177e4 LT |
396 | } |
397 | ||
58956317 | 398 | do_alloc: |
08433eff | 399 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
1da177e4 LT |
400 | if (!n) |
401 | goto out_entries; | |
402 | ||
c9ab4d85 | 403 | __skb_queue_head_init(&n->arp_queue); |
1da177e4 | 404 | rwlock_init(&n->lock); |
0ed8ddf4 | 405 | seqlock_init(&n->ha_lock); |
1da177e4 LT |
406 | n->updated = n->used = now; |
407 | n->nud_state = NUD_NONE; | |
408 | n->output = neigh_blackhole; | |
f6b72b62 | 409 | seqlock_init(&n->hh.hh_lock); |
1da177e4 | 410 | n->parms = neigh_parms_clone(&tbl->parms); |
e99e88a9 | 411 | timer_setup(&n->timer, neigh_timer_handler, 0); |
1da177e4 LT |
412 | |
413 | NEIGH_CACHE_STAT_INC(tbl, allocs); | |
414 | n->tbl = tbl; | |
9f237430 | 415 | refcount_set(&n->refcnt, 1); |
1da177e4 | 416 | n->dead = 1; |
8cc196d6 | 417 | INIT_LIST_HEAD(&n->gc_list); |
58956317 DA |
418 | |
419 | atomic_inc(&tbl->entries); | |
1da177e4 LT |
420 | out: |
421 | return n; | |
422 | ||
423 | out_entries: | |
e997f8a2 | 424 | if (!exempt_from_gc) |
58956317 | 425 | atomic_dec(&tbl->gc_entries); |
1da177e4 LT |
426 | goto out; |
427 | } | |
428 | ||
2c2aba6c DM |
429 | static void neigh_get_hash_rnd(u32 *x) |
430 | { | |
b3d0f789 | 431 | *x = get_random_u32() | 1; |
2c2aba6c DM |
432 | } |
433 | ||
cd089336 | 434 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
1da177e4 | 435 | { |
cd089336 | 436 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
d6bf7817 | 437 | struct neigh_hash_table *ret; |
6193d2be | 438 | struct neighbour __rcu **buckets; |
2c2aba6c | 439 | int i; |
1da177e4 | 440 | |
d6bf7817 ED |
441 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
442 | if (!ret) | |
443 | return NULL; | |
85704cb8 | 444 | if (size <= PAGE_SIZE) { |
d6bf7817 | 445 | buckets = kzalloc(size, GFP_ATOMIC); |
85704cb8 | 446 | } else { |
6193d2be | 447 | buckets = (struct neighbour __rcu **) |
d6bf7817 ED |
448 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
449 | get_order(size)); | |
01b833ab | 450 | kmemleak_alloc(buckets, size, 1, GFP_ATOMIC); |
85704cb8 | 451 | } |
d6bf7817 ED |
452 | if (!buckets) { |
453 | kfree(ret); | |
454 | return NULL; | |
1da177e4 | 455 | } |
6193d2be | 456 | ret->hash_buckets = buckets; |
cd089336 | 457 | ret->hash_shift = shift; |
2c2aba6c DM |
458 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
459 | neigh_get_hash_rnd(&ret->hash_rnd[i]); | |
1da177e4 LT |
460 | return ret; |
461 | } | |
462 | ||
d6bf7817 | 463 | static void neigh_hash_free_rcu(struct rcu_head *head) |
1da177e4 | 464 | { |
d6bf7817 ED |
465 | struct neigh_hash_table *nht = container_of(head, |
466 | struct neigh_hash_table, | |
467 | rcu); | |
cd089336 | 468 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
6193d2be | 469 | struct neighbour __rcu **buckets = nht->hash_buckets; |
1da177e4 | 470 | |
85704cb8 | 471 | if (size <= PAGE_SIZE) { |
d6bf7817 | 472 | kfree(buckets); |
85704cb8 KK |
473 | } else { |
474 | kmemleak_free(buckets); | |
d6bf7817 | 475 | free_pages((unsigned long)buckets, get_order(size)); |
85704cb8 | 476 | } |
d6bf7817 | 477 | kfree(nht); |
1da177e4 LT |
478 | } |
479 | ||
d6bf7817 | 480 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
cd089336 | 481 | unsigned long new_shift) |
1da177e4 | 482 | { |
d6bf7817 ED |
483 | unsigned int i, hash; |
484 | struct neigh_hash_table *new_nht, *old_nht; | |
1da177e4 LT |
485 | |
486 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); | |
487 | ||
d6bf7817 ED |
488 | old_nht = rcu_dereference_protected(tbl->nht, |
489 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 490 | new_nht = neigh_hash_alloc(new_shift); |
d6bf7817 ED |
491 | if (!new_nht) |
492 | return old_nht; | |
1da177e4 | 493 | |
cd089336 | 494 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
1da177e4 LT |
495 | struct neighbour *n, *next; |
496 | ||
767e97e1 ED |
497 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
498 | lockdep_is_held(&tbl->lock)); | |
d6bf7817 ED |
499 | n != NULL; |
500 | n = next) { | |
501 | hash = tbl->hash(n->primary_key, n->dev, | |
502 | new_nht->hash_rnd); | |
1da177e4 | 503 | |
cd089336 | 504 | hash >>= (32 - new_nht->hash_shift); |
767e97e1 ED |
505 | next = rcu_dereference_protected(n->next, |
506 | lockdep_is_held(&tbl->lock)); | |
507 | ||
508 | rcu_assign_pointer(n->next, | |
509 | rcu_dereference_protected( | |
510 | new_nht->hash_buckets[hash], | |
511 | lockdep_is_held(&tbl->lock))); | |
512 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); | |
1da177e4 LT |
513 | } |
514 | } | |
1da177e4 | 515 | |
d6bf7817 ED |
516 | rcu_assign_pointer(tbl->nht, new_nht); |
517 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); | |
518 | return new_nht; | |
1da177e4 LT |
519 | } |
520 | ||
521 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
522 | struct net_device *dev) | |
523 | { | |
524 | struct neighbour *n; | |
4ec93edb | 525 | |
1da177e4 LT |
526 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
527 | ||
d6bf7817 | 528 | rcu_read_lock_bh(); |
60395a20 EB |
529 | n = __neigh_lookup_noref(tbl, pkey, dev); |
530 | if (n) { | |
9f237430 | 531 | if (!refcount_inc_not_zero(&n->refcnt)) |
60395a20 EB |
532 | n = NULL; |
533 | NEIGH_CACHE_STAT_INC(tbl, hits); | |
1da177e4 | 534 | } |
767e97e1 | 535 | |
d6bf7817 | 536 | rcu_read_unlock_bh(); |
1da177e4 LT |
537 | return n; |
538 | } | |
0a204500 | 539 | EXPORT_SYMBOL(neigh_lookup); |
1da177e4 | 540 | |
426b5303 EB |
541 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
542 | const void *pkey) | |
1da177e4 LT |
543 | { |
544 | struct neighbour *n; | |
01ccdf12 | 545 | unsigned int key_len = tbl->key_len; |
bc4bf5f3 | 546 | u32 hash_val; |
d6bf7817 | 547 | struct neigh_hash_table *nht; |
1da177e4 LT |
548 | |
549 | NEIGH_CACHE_STAT_INC(tbl, lookups); | |
550 | ||
d6bf7817 ED |
551 | rcu_read_lock_bh(); |
552 | nht = rcu_dereference_bh(tbl->nht); | |
cd089336 | 553 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
767e97e1 ED |
554 | |
555 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
556 | n != NULL; | |
557 | n = rcu_dereference_bh(n->next)) { | |
426b5303 | 558 | if (!memcmp(n->primary_key, pkey, key_len) && |
878628fb | 559 | net_eq(dev_net(n->dev), net)) { |
9f237430 | 560 | if (!refcount_inc_not_zero(&n->refcnt)) |
767e97e1 | 561 | n = NULL; |
1da177e4 LT |
562 | NEIGH_CACHE_STAT_INC(tbl, hits); |
563 | break; | |
564 | } | |
565 | } | |
767e97e1 | 566 | |
d6bf7817 | 567 | rcu_read_unlock_bh(); |
1da177e4 LT |
568 | return n; |
569 | } | |
0a204500 | 570 | EXPORT_SYMBOL(neigh_lookup_nodev); |
1da177e4 | 571 | |
58956317 DA |
572 | static struct neighbour *___neigh_create(struct neigh_table *tbl, |
573 | const void *pkey, | |
574 | struct net_device *dev, | |
e997f8a2 | 575 | bool exempt_from_gc, bool want_ref) |
1da177e4 | 576 | { |
e997f8a2 | 577 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev, exempt_from_gc); |
1da177e4 | 578 | u32 hash_val; |
01ccdf12 | 579 | unsigned int key_len = tbl->key_len; |
1da177e4 | 580 | int error; |
d6bf7817 | 581 | struct neigh_hash_table *nht; |
1da177e4 | 582 | |
fc651001 DA |
583 | trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc); |
584 | ||
1da177e4 LT |
585 | if (!n) { |
586 | rc = ERR_PTR(-ENOBUFS); | |
587 | goto out; | |
588 | } | |
589 | ||
590 | memcpy(n->primary_key, pkey, key_len); | |
591 | n->dev = dev; | |
592 | dev_hold(dev); | |
593 | ||
594 | /* Protocol specific setup. */ | |
595 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { | |
596 | rc = ERR_PTR(error); | |
597 | goto out_neigh_release; | |
598 | } | |
599 | ||
da6a8fa0 | 600 | if (dev->netdev_ops->ndo_neigh_construct) { |
503eebc2 | 601 | error = dev->netdev_ops->ndo_neigh_construct(dev, n); |
da6a8fa0 DM |
602 | if (error < 0) { |
603 | rc = ERR_PTR(error); | |
604 | goto out_neigh_release; | |
605 | } | |
606 | } | |
607 | ||
447f2191 DM |
608 | /* Device specific setup. */ |
609 | if (n->parms->neigh_setup && | |
610 | (error = n->parms->neigh_setup(n)) < 0) { | |
611 | rc = ERR_PTR(error); | |
612 | goto out_neigh_release; | |
613 | } | |
614 | ||
1f9248e5 | 615 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 LT |
616 | |
617 | write_lock_bh(&tbl->lock); | |
d6bf7817 ED |
618 | nht = rcu_dereference_protected(tbl->nht, |
619 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 620 | |
cd089336 DM |
621 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
622 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); | |
1da177e4 | 623 | |
096b9854 | 624 | hash_val = tbl->hash(n->primary_key, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
1da177e4 LT |
625 | |
626 | if (n->parms->dead) { | |
627 | rc = ERR_PTR(-EINVAL); | |
628 | goto out_tbl_unlock; | |
629 | } | |
630 | ||
767e97e1 ED |
631 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
632 | lockdep_is_held(&tbl->lock)); | |
633 | n1 != NULL; | |
634 | n1 = rcu_dereference_protected(n1->next, | |
635 | lockdep_is_held(&tbl->lock))) { | |
096b9854 | 636 | if (dev == n1->dev && !memcmp(n1->primary_key, n->primary_key, key_len)) { |
a263b309 DM |
637 | if (want_ref) |
638 | neigh_hold(n1); | |
1da177e4 LT |
639 | rc = n1; |
640 | goto out_tbl_unlock; | |
641 | } | |
642 | } | |
643 | ||
1da177e4 | 644 | n->dead = 0; |
e997f8a2 | 645 | if (!exempt_from_gc) |
8cc196d6 DA |
646 | list_add_tail(&n->gc_list, &n->tbl->gc_list); |
647 | ||
a263b309 DM |
648 | if (want_ref) |
649 | neigh_hold(n); | |
767e97e1 ED |
650 | rcu_assign_pointer(n->next, |
651 | rcu_dereference_protected(nht->hash_buckets[hash_val], | |
652 | lockdep_is_held(&tbl->lock))); | |
653 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); | |
1da177e4 | 654 | write_unlock_bh(&tbl->lock); |
d5d427cd | 655 | neigh_dbg(2, "neigh %p is created\n", n); |
1da177e4 LT |
656 | rc = n; |
657 | out: | |
658 | return rc; | |
659 | out_tbl_unlock: | |
660 | write_unlock_bh(&tbl->lock); | |
661 | out_neigh_release: | |
64c6f4bb DA |
662 | if (!exempt_from_gc) |
663 | atomic_dec(&tbl->gc_entries); | |
1da177e4 LT |
664 | neigh_release(n); |
665 | goto out; | |
666 | } | |
58956317 DA |
667 | |
668 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
669 | struct net_device *dev, bool want_ref) | |
670 | { | |
671 | return ___neigh_create(tbl, pkey, dev, false, want_ref); | |
672 | } | |
a263b309 | 673 | EXPORT_SYMBOL(__neigh_create); |
1da177e4 | 674 | |
01ccdf12 | 675 | static u32 pneigh_hash(const void *pkey, unsigned int key_len) |
fa86d322 | 676 | { |
fa86d322 | 677 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
fa86d322 PE |
678 | hash_val ^= (hash_val >> 16); |
679 | hash_val ^= hash_val >> 8; | |
680 | hash_val ^= hash_val >> 4; | |
681 | hash_val &= PNEIGH_HASHMASK; | |
be01d655 YH |
682 | return hash_val; |
683 | } | |
fa86d322 | 684 | |
be01d655 YH |
685 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
686 | struct net *net, | |
687 | const void *pkey, | |
01ccdf12 | 688 | unsigned int key_len, |
be01d655 YH |
689 | struct net_device *dev) |
690 | { | |
691 | while (n) { | |
fa86d322 | 692 | if (!memcmp(n->key, pkey, key_len) && |
be01d655 | 693 | net_eq(pneigh_net(n), net) && |
fa86d322 | 694 | (n->dev == dev || !n->dev)) |
be01d655 YH |
695 | return n; |
696 | n = n->next; | |
fa86d322 | 697 | } |
be01d655 YH |
698 | return NULL; |
699 | } | |
fa86d322 | 700 | |
be01d655 YH |
701 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
702 | struct net *net, const void *pkey, struct net_device *dev) | |
703 | { | |
01ccdf12 | 704 | unsigned int key_len = tbl->key_len; |
be01d655 YH |
705 | u32 hash_val = pneigh_hash(pkey, key_len); |
706 | ||
707 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], | |
708 | net, pkey, key_len, dev); | |
fa86d322 | 709 | } |
0a204500 | 710 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
fa86d322 | 711 | |
426b5303 EB |
712 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
713 | struct net *net, const void *pkey, | |
1da177e4 LT |
714 | struct net_device *dev, int creat) |
715 | { | |
716 | struct pneigh_entry *n; | |
01ccdf12 | 717 | unsigned int key_len = tbl->key_len; |
be01d655 | 718 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
719 | |
720 | read_lock_bh(&tbl->lock); | |
be01d655 YH |
721 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
722 | net, pkey, key_len, dev); | |
1da177e4 | 723 | read_unlock_bh(&tbl->lock); |
be01d655 YH |
724 | |
725 | if (n || !creat) | |
1da177e4 LT |
726 | goto out; |
727 | ||
4ae28944 PE |
728 | ASSERT_RTNL(); |
729 | ||
1da177e4 LT |
730 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
731 | if (!n) | |
732 | goto out; | |
733 | ||
754d5da6 | 734 | n->protocol = 0; |
efd7ef1c | 735 | write_pnet(&n->net, net); |
1da177e4 LT |
736 | memcpy(n->key, pkey, key_len); |
737 | n->dev = dev; | |
738 | if (dev) | |
739 | dev_hold(dev); | |
740 | ||
741 | if (tbl->pconstructor && tbl->pconstructor(n)) { | |
742 | if (dev) | |
743 | dev_put(dev); | |
744 | kfree(n); | |
745 | n = NULL; | |
746 | goto out; | |
747 | } | |
748 | ||
749 | write_lock_bh(&tbl->lock); | |
750 | n->next = tbl->phash_buckets[hash_val]; | |
751 | tbl->phash_buckets[hash_val] = n; | |
752 | write_unlock_bh(&tbl->lock); | |
753 | out: | |
754 | return n; | |
755 | } | |
0a204500 | 756 | EXPORT_SYMBOL(pneigh_lookup); |
1da177e4 LT |
757 | |
758 | ||
426b5303 | 759 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
1da177e4 LT |
760 | struct net_device *dev) |
761 | { | |
762 | struct pneigh_entry *n, **np; | |
01ccdf12 | 763 | unsigned int key_len = tbl->key_len; |
be01d655 | 764 | u32 hash_val = pneigh_hash(pkey, key_len); |
1da177e4 LT |
765 | |
766 | write_lock_bh(&tbl->lock); | |
767 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; | |
768 | np = &n->next) { | |
426b5303 | 769 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
878628fb | 770 | net_eq(pneigh_net(n), net)) { |
1da177e4 LT |
771 | *np = n->next; |
772 | write_unlock_bh(&tbl->lock); | |
773 | if (tbl->pdestructor) | |
774 | tbl->pdestructor(n); | |
775 | if (n->dev) | |
776 | dev_put(n->dev); | |
777 | kfree(n); | |
778 | return 0; | |
779 | } | |
780 | } | |
781 | write_unlock_bh(&tbl->lock); | |
782 | return -ENOENT; | |
783 | } | |
784 | ||
53b76cdf WB |
785 | static int pneigh_ifdown_and_unlock(struct neigh_table *tbl, |
786 | struct net_device *dev) | |
1da177e4 | 787 | { |
53b76cdf | 788 | struct pneigh_entry *n, **np, *freelist = NULL; |
1da177e4 LT |
789 | u32 h; |
790 | ||
791 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { | |
792 | np = &tbl->phash_buckets[h]; | |
793 | while ((n = *np) != NULL) { | |
794 | if (!dev || n->dev == dev) { | |
795 | *np = n->next; | |
53b76cdf WB |
796 | n->next = freelist; |
797 | freelist = n; | |
1da177e4 LT |
798 | continue; |
799 | } | |
800 | np = &n->next; | |
801 | } | |
802 | } | |
53b76cdf WB |
803 | write_unlock_bh(&tbl->lock); |
804 | while ((n = freelist)) { | |
805 | freelist = n->next; | |
806 | n->next = NULL; | |
807 | if (tbl->pdestructor) | |
808 | tbl->pdestructor(n); | |
809 | if (n->dev) | |
810 | dev_put(n->dev); | |
811 | kfree(n); | |
812 | } | |
1da177e4 LT |
813 | return -ENOENT; |
814 | } | |
815 | ||
06f0511d DL |
816 | static void neigh_parms_destroy(struct neigh_parms *parms); |
817 | ||
818 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
819 | { | |
6343944b | 820 | if (refcount_dec_and_test(&parms->refcnt)) |
06f0511d DL |
821 | neigh_parms_destroy(parms); |
822 | } | |
1da177e4 LT |
823 | |
824 | /* | |
825 | * neighbour must already be out of the table; | |
826 | * | |
827 | */ | |
828 | void neigh_destroy(struct neighbour *neigh) | |
829 | { | |
da6a8fa0 DM |
830 | struct net_device *dev = neigh->dev; |
831 | ||
1da177e4 LT |
832 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
833 | ||
834 | if (!neigh->dead) { | |
e005d193 | 835 | pr_warn("Destroying alive neighbour %p\n", neigh); |
1da177e4 LT |
836 | dump_stack(); |
837 | return; | |
838 | } | |
839 | ||
840 | if (neigh_del_timer(neigh)) | |
e005d193 | 841 | pr_warn("Impossible event\n"); |
1da177e4 | 842 | |
c9ab4d85 ED |
843 | write_lock_bh(&neigh->lock); |
844 | __skb_queue_purge(&neigh->arp_queue); | |
845 | write_unlock_bh(&neigh->lock); | |
8b5c171b | 846 | neigh->arp_queue_len_bytes = 0; |
1da177e4 | 847 | |
447f2191 | 848 | if (dev->netdev_ops->ndo_neigh_destroy) |
503eebc2 | 849 | dev->netdev_ops->ndo_neigh_destroy(dev, neigh); |
447f2191 | 850 | |
da6a8fa0 | 851 | dev_put(dev); |
1da177e4 LT |
852 | neigh_parms_put(neigh->parms); |
853 | ||
d5d427cd | 854 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
1da177e4 LT |
855 | |
856 | atomic_dec(&neigh->tbl->entries); | |
5b8b0060 | 857 | kfree_rcu(neigh, rcu); |
1da177e4 | 858 | } |
0a204500 | 859 | EXPORT_SYMBOL(neigh_destroy); |
1da177e4 LT |
860 | |
861 | /* Neighbour state is suspicious; | |
862 | disable fast path. | |
863 | ||
864 | Called with write_locked neigh. | |
865 | */ | |
866 | static void neigh_suspect(struct neighbour *neigh) | |
867 | { | |
d5d427cd | 868 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 LT |
869 | |
870 | neigh->output = neigh->ops->output; | |
1da177e4 LT |
871 | } |
872 | ||
873 | /* Neighbour state is OK; | |
874 | enable fast path. | |
875 | ||
876 | Called with write_locked neigh. | |
877 | */ | |
878 | static void neigh_connect(struct neighbour *neigh) | |
879 | { | |
d5d427cd | 880 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
1da177e4 LT |
881 | |
882 | neigh->output = neigh->ops->connected_output; | |
1da177e4 LT |
883 | } |
884 | ||
e4c4e448 | 885 | static void neigh_periodic_work(struct work_struct *work) |
1da177e4 | 886 | { |
e4c4e448 | 887 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
767e97e1 ED |
888 | struct neighbour *n; |
889 | struct neighbour __rcu **np; | |
e4c4e448 | 890 | unsigned int i; |
d6bf7817 | 891 | struct neigh_hash_table *nht; |
1da177e4 LT |
892 | |
893 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); | |
894 | ||
e4c4e448 | 895 | write_lock_bh(&tbl->lock); |
d6bf7817 ED |
896 | nht = rcu_dereference_protected(tbl->nht, |
897 | lockdep_is_held(&tbl->lock)); | |
1da177e4 LT |
898 | |
899 | /* | |
900 | * periodically recompute ReachableTime from random function | |
901 | */ | |
902 | ||
e4c4e448 | 903 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
1da177e4 | 904 | struct neigh_parms *p; |
e4c4e448 | 905 | tbl->last_rand = jiffies; |
75fbfd33 | 906 | list_for_each_entry(p, &tbl->parms_list, list) |
1da177e4 | 907 | p->reachable_time = |
1f9248e5 | 908 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
1da177e4 LT |
909 | } |
910 | ||
feff9ab2 DJ |
911 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
912 | goto out; | |
913 | ||
cd089336 | 914 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
d6bf7817 | 915 | np = &nht->hash_buckets[i]; |
1da177e4 | 916 | |
767e97e1 ED |
917 | while ((n = rcu_dereference_protected(*np, |
918 | lockdep_is_held(&tbl->lock))) != NULL) { | |
e4c4e448 | 919 | unsigned int state; |
1da177e4 | 920 | |
e4c4e448 | 921 | write_lock(&n->lock); |
1da177e4 | 922 | |
e4c4e448 | 923 | state = n->nud_state; |
9ce33e46 RP |
924 | if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) || |
925 | (n->flags & NTF_EXT_LEARNED)) { | |
e4c4e448 ED |
926 | write_unlock(&n->lock); |
927 | goto next_elt; | |
928 | } | |
1da177e4 | 929 | |
e4c4e448 ED |
930 | if (time_before(n->used, n->confirmed)) |
931 | n->used = n->confirmed; | |
1da177e4 | 932 | |
9f237430 | 933 | if (refcount_read(&n->refcnt) == 1 && |
e4c4e448 | 934 | (state == NUD_FAILED || |
1f9248e5 | 935 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
e4c4e448 | 936 | *np = n->next; |
58956317 | 937 | neigh_mark_dead(n); |
e4c4e448 ED |
938 | write_unlock(&n->lock); |
939 | neigh_cleanup_and_release(n); | |
940 | continue; | |
941 | } | |
1da177e4 | 942 | write_unlock(&n->lock); |
1da177e4 LT |
943 | |
944 | next_elt: | |
e4c4e448 ED |
945 | np = &n->next; |
946 | } | |
947 | /* | |
948 | * It's fine to release lock here, even if hash table | |
949 | * grows while we are preempted. | |
950 | */ | |
951 | write_unlock_bh(&tbl->lock); | |
952 | cond_resched(); | |
953 | write_lock_bh(&tbl->lock); | |
84338a6c MM |
954 | nht = rcu_dereference_protected(tbl->nht, |
955 | lockdep_is_held(&tbl->lock)); | |
1da177e4 | 956 | } |
2724680b | 957 | out: |
1f9248e5 JP |
958 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
959 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 | |
960 | * BASE_REACHABLE_TIME. | |
1da177e4 | 961 | */ |
f618002b | 962 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1f9248e5 | 963 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
e4c4e448 | 964 | write_unlock_bh(&tbl->lock); |
1da177e4 LT |
965 | } |
966 | ||
967 | static __inline__ int neigh_max_probes(struct neighbour *n) | |
968 | { | |
969 | struct neigh_parms *p = n->parms; | |
8da86466 YH |
970 | return NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES) + |
971 | (n->nud_state & NUD_PROBE ? NEIGH_VAR(p, MCAST_REPROBES) : | |
972 | NEIGH_VAR(p, MCAST_PROBES)); | |
1da177e4 LT |
973 | } |
974 | ||
5ef12d98 | 975 | static void neigh_invalidate(struct neighbour *neigh) |
0a141509 ED |
976 | __releases(neigh->lock) |
977 | __acquires(neigh->lock) | |
5ef12d98 TT |
978 | { |
979 | struct sk_buff *skb; | |
980 | ||
981 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); | |
d5d427cd | 982 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
5ef12d98 TT |
983 | neigh->updated = jiffies; |
984 | ||
985 | /* It is very thin place. report_unreachable is very complicated | |
986 | routine. Particularly, it can hit the same neighbour entry! | |
987 | ||
988 | So that, we try to be accurate and avoid dead loop. --ANK | |
989 | */ | |
990 | while (neigh->nud_state == NUD_FAILED && | |
991 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
992 | write_unlock(&neigh->lock); | |
993 | neigh->ops->error_report(neigh, skb); | |
994 | write_lock(&neigh->lock); | |
995 | } | |
c9ab4d85 | 996 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 997 | neigh->arp_queue_len_bytes = 0; |
5ef12d98 TT |
998 | } |
999 | ||
cd28ca0a ED |
1000 | static void neigh_probe(struct neighbour *neigh) |
1001 | __releases(neigh->lock) | |
1002 | { | |
4ed377e3 | 1003 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
cd28ca0a ED |
1004 | /* keep skb alive even if arp_queue overflows */ |
1005 | if (skb) | |
19125c1a | 1006 | skb = skb_clone(skb, GFP_ATOMIC); |
cd28ca0a | 1007 | write_unlock(&neigh->lock); |
48481c8f ED |
1008 | if (neigh->ops->solicit) |
1009 | neigh->ops->solicit(neigh, skb); | |
cd28ca0a | 1010 | atomic_inc(&neigh->probes); |
87fff3ca | 1011 | consume_skb(skb); |
cd28ca0a ED |
1012 | } |
1013 | ||
1da177e4 LT |
1014 | /* Called when a timer expires for a neighbour entry. */ |
1015 | ||
e99e88a9 | 1016 | static void neigh_timer_handler(struct timer_list *t) |
1da177e4 LT |
1017 | { |
1018 | unsigned long now, next; | |
e99e88a9 | 1019 | struct neighbour *neigh = from_timer(neigh, t, timer); |
95c96174 | 1020 | unsigned int state; |
1da177e4 LT |
1021 | int notify = 0; |
1022 | ||
1023 | write_lock(&neigh->lock); | |
1024 | ||
1025 | state = neigh->nud_state; | |
1026 | now = jiffies; | |
1027 | next = now + HZ; | |
1028 | ||
045f7b3b | 1029 | if (!(state & NUD_IN_TIMER)) |
1da177e4 | 1030 | goto out; |
1da177e4 LT |
1031 | |
1032 | if (state & NUD_REACHABLE) { | |
4ec93edb | 1033 | if (time_before_eq(now, |
1da177e4 | 1034 | neigh->confirmed + neigh->parms->reachable_time)) { |
d5d427cd | 1035 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
1da177e4 LT |
1036 | next = neigh->confirmed + neigh->parms->reachable_time; |
1037 | } else if (time_before_eq(now, | |
1f9248e5 JP |
1038 | neigh->used + |
1039 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1040 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
1da177e4 | 1041 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1042 | neigh->updated = jiffies; |
1da177e4 | 1043 | neigh_suspect(neigh); |
1f9248e5 | 1044 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
1da177e4 | 1045 | } else { |
d5d427cd | 1046 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
1da177e4 | 1047 | neigh->nud_state = NUD_STALE; |
955aaa2f | 1048 | neigh->updated = jiffies; |
1da177e4 | 1049 | neigh_suspect(neigh); |
8d71740c | 1050 | notify = 1; |
1da177e4 LT |
1051 | } |
1052 | } else if (state & NUD_DELAY) { | |
4ec93edb | 1053 | if (time_before_eq(now, |
1f9248e5 JP |
1054 | neigh->confirmed + |
1055 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { | |
d5d427cd | 1056 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
1da177e4 | 1057 | neigh->nud_state = NUD_REACHABLE; |
955aaa2f | 1058 | neigh->updated = jiffies; |
1da177e4 | 1059 | neigh_connect(neigh); |
8d71740c | 1060 | notify = 1; |
1da177e4 LT |
1061 | next = neigh->confirmed + neigh->parms->reachable_time; |
1062 | } else { | |
d5d427cd | 1063 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
1da177e4 | 1064 | neigh->nud_state = NUD_PROBE; |
955aaa2f | 1065 | neigh->updated = jiffies; |
1da177e4 | 1066 | atomic_set(&neigh->probes, 0); |
765c9c63 | 1067 | notify = 1; |
19e16d22 HL |
1068 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1069 | HZ/100); | |
1da177e4 LT |
1070 | } |
1071 | } else { | |
1072 | /* NUD_PROBE|NUD_INCOMPLETE */ | |
19e16d22 | 1073 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), HZ/100); |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && | |
1077 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { | |
1da177e4 LT |
1078 | neigh->nud_state = NUD_FAILED; |
1079 | notify = 1; | |
5ef12d98 | 1080 | neigh_invalidate(neigh); |
5e2c21dc | 1081 | goto out; |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | if (neigh->nud_state & NUD_IN_TIMER) { | |
1da177e4 LT |
1085 | if (time_before(next, jiffies + HZ/2)) |
1086 | next = jiffies + HZ/2; | |
6fb9974f HX |
1087 | if (!mod_timer(&neigh->timer, next)) |
1088 | neigh_hold(neigh); | |
1da177e4 LT |
1089 | } |
1090 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { | |
cd28ca0a | 1091 | neigh_probe(neigh); |
9ff56607 | 1092 | } else { |
69cc64d8 | 1093 | out: |
9ff56607 DM |
1094 | write_unlock(&neigh->lock); |
1095 | } | |
d961db35 | 1096 | |
8d71740c | 1097 | if (notify) |
7b8f7a40 | 1098 | neigh_update_notify(neigh, 0); |
1da177e4 | 1099 | |
56dd18a4 RP |
1100 | trace_neigh_timer_handler(neigh, 0); |
1101 | ||
1da177e4 LT |
1102 | neigh_release(neigh); |
1103 | } | |
1104 | ||
1105 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
1106 | { | |
1107 | int rc; | |
cd28ca0a | 1108 | bool immediate_probe = false; |
1da177e4 LT |
1109 | |
1110 | write_lock_bh(&neigh->lock); | |
1111 | ||
1112 | rc = 0; | |
1113 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) | |
1114 | goto out_unlock_bh; | |
2c51a97f JA |
1115 | if (neigh->dead) |
1116 | goto out_dead; | |
1da177e4 | 1117 | |
1da177e4 | 1118 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
1f9248e5 JP |
1119 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
1120 | NEIGH_VAR(neigh->parms, APP_PROBES)) { | |
cd28ca0a ED |
1121 | unsigned long next, now = jiffies; |
1122 | ||
1f9248e5 JP |
1123 | atomic_set(&neigh->probes, |
1124 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); | |
071c3798 | 1125 | neigh_del_timer(neigh); |
1da177e4 | 1126 | neigh->nud_state = NUD_INCOMPLETE; |
cd28ca0a | 1127 | neigh->updated = now; |
1f9248e5 | 1128 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
19e16d22 | 1129 | HZ/100); |
cd28ca0a ED |
1130 | neigh_add_timer(neigh, next); |
1131 | immediate_probe = true; | |
1da177e4 LT |
1132 | } else { |
1133 | neigh->nud_state = NUD_FAILED; | |
955aaa2f | 1134 | neigh->updated = jiffies; |
1da177e4 LT |
1135 | write_unlock_bh(&neigh->lock); |
1136 | ||
f3fbbe0f | 1137 | kfree_skb(skb); |
1da177e4 LT |
1138 | return 1; |
1139 | } | |
1140 | } else if (neigh->nud_state & NUD_STALE) { | |
d5d427cd | 1141 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
071c3798 | 1142 | neigh_del_timer(neigh); |
1da177e4 | 1143 | neigh->nud_state = NUD_DELAY; |
955aaa2f | 1144 | neigh->updated = jiffies; |
1f9248e5 JP |
1145 | neigh_add_timer(neigh, jiffies + |
1146 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); | |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | if (neigh->nud_state == NUD_INCOMPLETE) { | |
1150 | if (skb) { | |
8b5c171b | 1151 | while (neigh->arp_queue_len_bytes + skb->truesize > |
1f9248e5 | 1152 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
1da177e4 | 1153 | struct sk_buff *buff; |
8b5c171b | 1154 | |
f72051b0 | 1155 | buff = __skb_dequeue(&neigh->arp_queue); |
8b5c171b ED |
1156 | if (!buff) |
1157 | break; | |
1158 | neigh->arp_queue_len_bytes -= buff->truesize; | |
1da177e4 | 1159 | kfree_skb(buff); |
9a6d276e | 1160 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
1da177e4 | 1161 | } |
a4731138 | 1162 | skb_dst_force(skb); |
1da177e4 | 1163 | __skb_queue_tail(&neigh->arp_queue, skb); |
8b5c171b | 1164 | neigh->arp_queue_len_bytes += skb->truesize; |
1da177e4 LT |
1165 | } |
1166 | rc = 1; | |
1167 | } | |
1168 | out_unlock_bh: | |
cd28ca0a ED |
1169 | if (immediate_probe) |
1170 | neigh_probe(neigh); | |
1171 | else | |
1172 | write_unlock(&neigh->lock); | |
1173 | local_bh_enable(); | |
56dd18a4 | 1174 | trace_neigh_event_send_done(neigh, rc); |
1da177e4 | 1175 | return rc; |
2c51a97f JA |
1176 | |
1177 | out_dead: | |
1178 | if (neigh->nud_state & NUD_STALE) | |
1179 | goto out_unlock_bh; | |
1180 | write_unlock_bh(&neigh->lock); | |
1181 | kfree_skb(skb); | |
56dd18a4 | 1182 | trace_neigh_event_send_dead(neigh, 1); |
2c51a97f | 1183 | return 1; |
1da177e4 | 1184 | } |
0a204500 | 1185 | EXPORT_SYMBOL(__neigh_event_send); |
1da177e4 | 1186 | |
f6b72b62 | 1187 | static void neigh_update_hhs(struct neighbour *neigh) |
1da177e4 LT |
1188 | { |
1189 | struct hh_cache *hh; | |
3b04ddde | 1190 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
91a72a70 DK |
1191 | = NULL; |
1192 | ||
1193 | if (neigh->dev->header_ops) | |
1194 | update = neigh->dev->header_ops->cache_update; | |
1da177e4 LT |
1195 | |
1196 | if (update) { | |
f6b72b62 | 1197 | hh = &neigh->hh; |
c305c6ae | 1198 | if (READ_ONCE(hh->hh_len)) { |
3644f0ce | 1199 | write_seqlock_bh(&hh->hh_lock); |
1da177e4 | 1200 | update(hh, neigh->dev, neigh->ha); |
3644f0ce | 1201 | write_sequnlock_bh(&hh->hh_lock); |
1da177e4 LT |
1202 | } |
1203 | } | |
1204 | } | |
1205 | ||
1206 | ||
1207 | ||
1208 | /* Generic update routine. | |
1209 | -- lladdr is new lladdr or NULL, if it is not supplied. | |
1210 | -- new is new state. | |
1211 | -- flags | |
1212 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, | |
1213 | if it is different. | |
1214 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" | |
4ec93edb | 1215 | lladdr instead of overriding it |
1da177e4 | 1216 | if it is different. |
1da177e4 LT |
1217 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
1218 | ||
4ec93edb | 1219 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
1da177e4 LT |
1220 | NTF_ROUTER flag. |
1221 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as | |
1222 | a router. | |
1223 | ||
1224 | Caller MUST hold reference count on the entry. | |
1225 | */ | |
1226 | ||
7a35a50d DA |
1227 | static int __neigh_update(struct neighbour *neigh, const u8 *lladdr, |
1228 | u8 new, u32 flags, u32 nlmsg_pid, | |
1229 | struct netlink_ext_ack *extack) | |
1da177e4 | 1230 | { |
e997f8a2 | 1231 | bool ext_learn_change = false; |
1da177e4 LT |
1232 | u8 old; |
1233 | int err; | |
1da177e4 | 1234 | int notify = 0; |
1da177e4 LT |
1235 | struct net_device *dev; |
1236 | int update_isrouter = 0; | |
1237 | ||
56dd18a4 RP |
1238 | trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid); |
1239 | ||
1da177e4 LT |
1240 | write_lock_bh(&neigh->lock); |
1241 | ||
1242 | dev = neigh->dev; | |
1243 | old = neigh->nud_state; | |
1244 | err = -EPERM; | |
1245 | ||
4ec93edb | 1246 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
1da177e4 LT |
1247 | (old & (NUD_NOARP | NUD_PERMANENT))) |
1248 | goto out; | |
7a35a50d DA |
1249 | if (neigh->dead) { |
1250 | NL_SET_ERR_MSG(extack, "Neighbor entry is now dead"); | |
2c51a97f | 1251 | goto out; |
7a35a50d | 1252 | } |
1da177e4 | 1253 | |
e997f8a2 | 1254 | ext_learn_change = neigh_update_ext_learned(neigh, flags, ¬ify); |
9ce33e46 | 1255 | |
1da177e4 LT |
1256 | if (!(new & NUD_VALID)) { |
1257 | neigh_del_timer(neigh); | |
1258 | if (old & NUD_CONNECTED) | |
1259 | neigh_suspect(neigh); | |
9c29a2f5 | 1260 | neigh->nud_state = new; |
1da177e4 | 1261 | err = 0; |
1da177e4 | 1262 | notify = old & NUD_VALID; |
d2fb4fb8 | 1263 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
5ef12d98 TT |
1264 | (new & NUD_FAILED)) { |
1265 | neigh_invalidate(neigh); | |
1266 | notify = 1; | |
1267 | } | |
1da177e4 LT |
1268 | goto out; |
1269 | } | |
1270 | ||
1271 | /* Compare new lladdr with cached one */ | |
1272 | if (!dev->addr_len) { | |
1273 | /* First case: device needs no address. */ | |
1274 | lladdr = neigh->ha; | |
1275 | } else if (lladdr) { | |
1276 | /* The second case: if something is already cached | |
1277 | and a new address is proposed: | |
1278 | - compare new & old | |
1279 | - if they are different, check override flag | |
1280 | */ | |
4ec93edb | 1281 | if ((old & NUD_VALID) && |
1da177e4 LT |
1282 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
1283 | lladdr = neigh->ha; | |
1284 | } else { | |
1285 | /* No address is supplied; if we know something, | |
1286 | use it, otherwise discard the request. | |
1287 | */ | |
1288 | err = -EINVAL; | |
7a35a50d DA |
1289 | if (!(old & NUD_VALID)) { |
1290 | NL_SET_ERR_MSG(extack, "No link layer address given"); | |
1da177e4 | 1291 | goto out; |
7a35a50d | 1292 | } |
1da177e4 LT |
1293 | lladdr = neigh->ha; |
1294 | } | |
1295 | ||
f0e0d044 VK |
1296 | /* Update confirmed timestamp for neighbour entry after we |
1297 | * received ARP packet even if it doesn't change IP to MAC binding. | |
1298 | */ | |
1299 | if (new & NUD_CONNECTED) | |
1300 | neigh->confirmed = jiffies; | |
1301 | ||
1da177e4 LT |
1302 | /* If entry was valid and address is not changed, |
1303 | do not change entry state, if new one is STALE. | |
1304 | */ | |
1305 | err = 0; | |
1306 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
1307 | if (old & NUD_VALID) { | |
1308 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { | |
1309 | update_isrouter = 0; | |
1310 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && | |
1311 | (old & NUD_CONNECTED)) { | |
1312 | lladdr = neigh->ha; | |
1313 | new = NUD_STALE; | |
1314 | } else | |
1315 | goto out; | |
1316 | } else { | |
0e7bbcc1 JA |
1317 | if (lladdr == neigh->ha && new == NUD_STALE && |
1318 | !(flags & NEIGH_UPDATE_F_ADMIN)) | |
1da177e4 LT |
1319 | new = old; |
1320 | } | |
1321 | } | |
1322 | ||
f0e0d044 | 1323 | /* Update timestamp only once we know we will make a change to the |
77d71233 IH |
1324 | * neighbour entry. Otherwise we risk to move the locktime window with |
1325 | * noop updates and ignore relevant ARP updates. | |
1326 | */ | |
f0e0d044 | 1327 | if (new != old || lladdr != neigh->ha) |
77d71233 | 1328 | neigh->updated = jiffies; |
77d71233 | 1329 | |
1da177e4 LT |
1330 | if (new != old) { |
1331 | neigh_del_timer(neigh); | |
765c9c63 EK |
1332 | if (new & NUD_PROBE) |
1333 | atomic_set(&neigh->probes, 0); | |
a43d8994 | 1334 | if (new & NUD_IN_TIMER) |
4ec93edb YH |
1335 | neigh_add_timer(neigh, (jiffies + |
1336 | ((new & NUD_REACHABLE) ? | |
667347f1 DM |
1337 | neigh->parms->reachable_time : |
1338 | 0))); | |
9c29a2f5 | 1339 | neigh->nud_state = new; |
53385d2d | 1340 | notify = 1; |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | if (lladdr != neigh->ha) { | |
0ed8ddf4 | 1344 | write_seqlock(&neigh->ha_lock); |
1da177e4 | 1345 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
0ed8ddf4 | 1346 | write_sequnlock(&neigh->ha_lock); |
1da177e4 LT |
1347 | neigh_update_hhs(neigh); |
1348 | if (!(new & NUD_CONNECTED)) | |
1349 | neigh->confirmed = jiffies - | |
1f9248e5 | 1350 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
1da177e4 | 1351 | notify = 1; |
1da177e4 LT |
1352 | } |
1353 | if (new == old) | |
1354 | goto out; | |
1355 | if (new & NUD_CONNECTED) | |
1356 | neigh_connect(neigh); | |
1357 | else | |
1358 | neigh_suspect(neigh); | |
1359 | if (!(old & NUD_VALID)) { | |
1360 | struct sk_buff *skb; | |
1361 | ||
1362 | /* Again: avoid dead loop if something went wrong */ | |
1363 | ||
1364 | while (neigh->nud_state & NUD_VALID && | |
1365 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { | |
69cce1d1 DM |
1366 | struct dst_entry *dst = skb_dst(skb); |
1367 | struct neighbour *n2, *n1 = neigh; | |
1da177e4 | 1368 | write_unlock_bh(&neigh->lock); |
e049f288 | 1369 | |
1370 | rcu_read_lock(); | |
13a43d94 DM |
1371 | |
1372 | /* Why not just use 'neigh' as-is? The problem is that | |
1373 | * things such as shaper, eql, and sch_teql can end up | |
1374 | * using alternative, different, neigh objects to output | |
1375 | * the packet in the output path. So what we need to do | |
1376 | * here is re-lookup the top-level neigh in the path so | |
1377 | * we can reinject the packet there. | |
1378 | */ | |
1379 | n2 = NULL; | |
1380 | if (dst) { | |
1381 | n2 = dst_neigh_lookup_skb(dst, skb); | |
1382 | if (n2) | |
1383 | n1 = n2; | |
1384 | } | |
8f40b161 | 1385 | n1->output(n1, skb); |
13a43d94 DM |
1386 | if (n2) |
1387 | neigh_release(n2); | |
e049f288 | 1388 | rcu_read_unlock(); |
1389 | ||
1da177e4 LT |
1390 | write_lock_bh(&neigh->lock); |
1391 | } | |
c9ab4d85 | 1392 | __skb_queue_purge(&neigh->arp_queue); |
8b5c171b | 1393 | neigh->arp_queue_len_bytes = 0; |
1da177e4 LT |
1394 | } |
1395 | out: | |
fc6e8073 RP |
1396 | if (update_isrouter) |
1397 | neigh_update_is_router(neigh, flags, ¬ify); | |
1da177e4 | 1398 | write_unlock_bh(&neigh->lock); |
8d71740c | 1399 | |
e997f8a2 | 1400 | if (((new ^ old) & NUD_PERMANENT) || ext_learn_change) |
9c29a2f5 DA |
1401 | neigh_update_gc_list(neigh); |
1402 | ||
8d71740c | 1403 | if (notify) |
7b8f7a40 | 1404 | neigh_update_notify(neigh, nlmsg_pid); |
d961db35 | 1405 | |
56dd18a4 RP |
1406 | trace_neigh_update_done(neigh, err); |
1407 | ||
1da177e4 LT |
1408 | return err; |
1409 | } | |
7a35a50d DA |
1410 | |
1411 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
1412 | u32 flags, u32 nlmsg_pid) | |
1413 | { | |
1414 | return __neigh_update(neigh, lladdr, new, flags, nlmsg_pid, NULL); | |
1415 | } | |
0a204500 | 1416 | EXPORT_SYMBOL(neigh_update); |
1da177e4 | 1417 | |
7e980569 JB |
1418 | /* Update the neigh to listen temporarily for probe responses, even if it is |
1419 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. | |
1420 | */ | |
1421 | void __neigh_set_probe_once(struct neighbour *neigh) | |
1422 | { | |
2c51a97f JA |
1423 | if (neigh->dead) |
1424 | return; | |
7e980569 JB |
1425 | neigh->updated = jiffies; |
1426 | if (!(neigh->nud_state & NUD_FAILED)) | |
1427 | return; | |
2176d5d4 DJ |
1428 | neigh->nud_state = NUD_INCOMPLETE; |
1429 | atomic_set(&neigh->probes, neigh_max_probes(neigh)); | |
7e980569 | 1430 | neigh_add_timer(neigh, |
19e16d22 HL |
1431 | jiffies + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
1432 | HZ/100)); | |
7e980569 JB |
1433 | } |
1434 | EXPORT_SYMBOL(__neigh_set_probe_once); | |
1435 | ||
1da177e4 LT |
1436 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
1437 | u8 *lladdr, void *saddr, | |
1438 | struct net_device *dev) | |
1439 | { | |
1440 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, | |
1441 | lladdr || !dev->addr_len); | |
1442 | if (neigh) | |
4ec93edb | 1443 | neigh_update(neigh, lladdr, NUD_STALE, |
7b8f7a40 | 1444 | NEIGH_UPDATE_F_OVERRIDE, 0); |
1da177e4 LT |
1445 | return neigh; |
1446 | } | |
0a204500 | 1447 | EXPORT_SYMBOL(neigh_event_ns); |
1da177e4 | 1448 | |
34d101dd | 1449 | /* called with read_lock_bh(&n->lock); */ |
bdf53c58 | 1450 | static void neigh_hh_init(struct neighbour *n) |
1da177e4 | 1451 | { |
bdf53c58 EB |
1452 | struct net_device *dev = n->dev; |
1453 | __be16 prot = n->tbl->protocol; | |
f6b72b62 | 1454 | struct hh_cache *hh = &n->hh; |
0ed8ddf4 ED |
1455 | |
1456 | write_lock_bh(&n->lock); | |
34d101dd | 1457 | |
f6b72b62 DM |
1458 | /* Only one thread can come in here and initialize the |
1459 | * hh_cache entry. | |
1460 | */ | |
b23b5455 DM |
1461 | if (!hh->hh_len) |
1462 | dev->header_ops->cache(n, hh, prot); | |
34d101dd | 1463 | |
0ed8ddf4 | 1464 | write_unlock_bh(&n->lock); |
1da177e4 LT |
1465 | } |
1466 | ||
1da177e4 LT |
1467 | /* Slow and careful. */ |
1468 | ||
8f40b161 | 1469 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1470 | { |
1da177e4 LT |
1471 | int rc = 0; |
1472 | ||
1da177e4 LT |
1473 | if (!neigh_event_send(neigh, skb)) { |
1474 | int err; | |
1475 | struct net_device *dev = neigh->dev; | |
0ed8ddf4 | 1476 | unsigned int seq; |
34d101dd | 1477 | |
c305c6ae | 1478 | if (dev->header_ops->cache && !READ_ONCE(neigh->hh.hh_len)) |
bdf53c58 | 1479 | neigh_hh_init(neigh); |
34d101dd | 1480 | |
0ed8ddf4 | 1481 | do { |
e1f16503 | 1482 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1483 | seq = read_seqbegin(&neigh->ha_lock); |
1484 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1485 | neigh->ha, NULL, skb->len); | |
1486 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
34d101dd | 1487 | |
1da177e4 | 1488 | if (err >= 0) |
542d4d68 | 1489 | rc = dev_queue_xmit(skb); |
1da177e4 LT |
1490 | else |
1491 | goto out_kfree_skb; | |
1492 | } | |
1493 | out: | |
1494 | return rc; | |
1da177e4 LT |
1495 | out_kfree_skb: |
1496 | rc = -EINVAL; | |
1497 | kfree_skb(skb); | |
1498 | goto out; | |
1499 | } | |
0a204500 | 1500 | EXPORT_SYMBOL(neigh_resolve_output); |
1da177e4 LT |
1501 | |
1502 | /* As fast as possible without hh cache */ | |
1503 | ||
8f40b161 | 1504 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
1da177e4 | 1505 | { |
1da177e4 | 1506 | struct net_device *dev = neigh->dev; |
0ed8ddf4 | 1507 | unsigned int seq; |
8f40b161 | 1508 | int err; |
1da177e4 | 1509 | |
0ed8ddf4 | 1510 | do { |
e1f16503 | 1511 | __skb_pull(skb, skb_network_offset(skb)); |
0ed8ddf4 ED |
1512 | seq = read_seqbegin(&neigh->ha_lock); |
1513 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
1514 | neigh->ha, NULL, skb->len); | |
1515 | } while (read_seqretry(&neigh->ha_lock, seq)); | |
1516 | ||
1da177e4 | 1517 | if (err >= 0) |
542d4d68 | 1518 | err = dev_queue_xmit(skb); |
1da177e4 LT |
1519 | else { |
1520 | err = -EINVAL; | |
1521 | kfree_skb(skb); | |
1522 | } | |
1523 | return err; | |
1524 | } | |
0a204500 | 1525 | EXPORT_SYMBOL(neigh_connected_output); |
1da177e4 | 1526 | |
8f40b161 DM |
1527 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
1528 | { | |
1529 | return dev_queue_xmit(skb); | |
1530 | } | |
1531 | EXPORT_SYMBOL(neigh_direct_output); | |
1532 | ||
e99e88a9 | 1533 | static void neigh_proxy_process(struct timer_list *t) |
1da177e4 | 1534 | { |
e99e88a9 | 1535 | struct neigh_table *tbl = from_timer(tbl, t, proxy_timer); |
1da177e4 LT |
1536 | long sched_next = 0; |
1537 | unsigned long now = jiffies; | |
f72051b0 | 1538 | struct sk_buff *skb, *n; |
1da177e4 LT |
1539 | |
1540 | spin_lock(&tbl->proxy_queue.lock); | |
1541 | ||
f72051b0 DM |
1542 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
1543 | long tdif = NEIGH_CB(skb)->sched_next - now; | |
1da177e4 | 1544 | |
1da177e4 | 1545 | if (tdif <= 0) { |
f72051b0 | 1546 | struct net_device *dev = skb->dev; |
20e6074e | 1547 | |
f72051b0 | 1548 | __skb_unlink(skb, &tbl->proxy_queue); |
20e6074e ED |
1549 | if (tbl->proxy_redo && netif_running(dev)) { |
1550 | rcu_read_lock(); | |
f72051b0 | 1551 | tbl->proxy_redo(skb); |
20e6074e ED |
1552 | rcu_read_unlock(); |
1553 | } else { | |
f72051b0 | 1554 | kfree_skb(skb); |
20e6074e | 1555 | } |
1da177e4 LT |
1556 | |
1557 | dev_put(dev); | |
1558 | } else if (!sched_next || tdif < sched_next) | |
1559 | sched_next = tdif; | |
1560 | } | |
1561 | del_timer(&tbl->proxy_timer); | |
1562 | if (sched_next) | |
1563 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); | |
1564 | spin_unlock(&tbl->proxy_queue.lock); | |
1565 | } | |
1566 | ||
1567 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
1568 | struct sk_buff *skb) | |
1569 | { | |
1570 | unsigned long now = jiffies; | |
63862b5b AH |
1571 | |
1572 | unsigned long sched_next = now + (prandom_u32() % | |
1f9248e5 | 1573 | NEIGH_VAR(p, PROXY_DELAY)); |
1da177e4 | 1574 | |
1f9248e5 | 1575 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
1da177e4 LT |
1576 | kfree_skb(skb); |
1577 | return; | |
1578 | } | |
a61bbcf2 PM |
1579 | |
1580 | NEIGH_CB(skb)->sched_next = sched_next; | |
1581 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; | |
1da177e4 LT |
1582 | |
1583 | spin_lock(&tbl->proxy_queue.lock); | |
1584 | if (del_timer(&tbl->proxy_timer)) { | |
1585 | if (time_before(tbl->proxy_timer.expires, sched_next)) | |
1586 | sched_next = tbl->proxy_timer.expires; | |
1587 | } | |
adf30907 | 1588 | skb_dst_drop(skb); |
1da177e4 LT |
1589 | dev_hold(skb->dev); |
1590 | __skb_queue_tail(&tbl->proxy_queue, skb); | |
1591 | mod_timer(&tbl->proxy_timer, sched_next); | |
1592 | spin_unlock(&tbl->proxy_queue.lock); | |
1593 | } | |
0a204500 | 1594 | EXPORT_SYMBOL(pneigh_enqueue); |
1da177e4 | 1595 | |
97fd5bc7 | 1596 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
426b5303 EB |
1597 | struct net *net, int ifindex) |
1598 | { | |
1599 | struct neigh_parms *p; | |
1600 | ||
75fbfd33 | 1601 | list_for_each_entry(p, &tbl->parms_list, list) { |
878628fb | 1602 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
170d6f99 | 1603 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
426b5303 EB |
1604 | return p; |
1605 | } | |
1606 | ||
1607 | return NULL; | |
1608 | } | |
1da177e4 LT |
1609 | |
1610 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, | |
1611 | struct neigh_table *tbl) | |
1612 | { | |
cf89d6b2 | 1613 | struct neigh_parms *p; |
00829823 SH |
1614 | struct net *net = dev_net(dev); |
1615 | const struct net_device_ops *ops = dev->netdev_ops; | |
426b5303 | 1616 | |
cf89d6b2 | 1617 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
1da177e4 | 1618 | if (p) { |
1da177e4 | 1619 | p->tbl = tbl; |
6343944b | 1620 | refcount_set(&p->refcnt, 1); |
1da177e4 | 1621 | p->reachable_time = |
1f9248e5 | 1622 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
63134803 VF |
1623 | dev_hold(dev); |
1624 | p->dev = dev; | |
efd7ef1c | 1625 | write_pnet(&p->net, net); |
63134803 | 1626 | p->sysctl_table = NULL; |
c7fb64db | 1627 | |
00829823 | 1628 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
63134803 | 1629 | dev_put(dev); |
486b51d3 DL |
1630 | kfree(p); |
1631 | return NULL; | |
1da177e4 | 1632 | } |
486b51d3 | 1633 | |
1da177e4 | 1634 | write_lock_bh(&tbl->lock); |
75fbfd33 | 1635 | list_add(&p->list, &tbl->parms.list); |
1da177e4 | 1636 | write_unlock_bh(&tbl->lock); |
1d4c8c29 JP |
1637 | |
1638 | neigh_parms_data_state_cleanall(p); | |
1da177e4 LT |
1639 | } |
1640 | return p; | |
1641 | } | |
0a204500 | 1642 | EXPORT_SYMBOL(neigh_parms_alloc); |
1da177e4 LT |
1643 | |
1644 | static void neigh_rcu_free_parms(struct rcu_head *head) | |
1645 | { | |
1646 | struct neigh_parms *parms = | |
1647 | container_of(head, struct neigh_parms, rcu_head); | |
1648 | ||
1649 | neigh_parms_put(parms); | |
1650 | } | |
1651 | ||
1652 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) | |
1653 | { | |
1da177e4 LT |
1654 | if (!parms || parms == &tbl->parms) |
1655 | return; | |
1656 | write_lock_bh(&tbl->lock); | |
75fbfd33 ND |
1657 | list_del(&parms->list); |
1658 | parms->dead = 1; | |
1da177e4 | 1659 | write_unlock_bh(&tbl->lock); |
75fbfd33 ND |
1660 | if (parms->dev) |
1661 | dev_put(parms->dev); | |
1662 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); | |
1da177e4 | 1663 | } |
0a204500 | 1664 | EXPORT_SYMBOL(neigh_parms_release); |
1da177e4 | 1665 | |
06f0511d | 1666 | static void neigh_parms_destroy(struct neigh_parms *parms) |
1da177e4 LT |
1667 | { |
1668 | kfree(parms); | |
1669 | } | |
1670 | ||
c2ecba71 PE |
1671 | static struct lock_class_key neigh_table_proxy_queue_class; |
1672 | ||
d7480fd3 WC |
1673 | static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly; |
1674 | ||
1675 | void neigh_table_init(int index, struct neigh_table *tbl) | |
1da177e4 LT |
1676 | { |
1677 | unsigned long now = jiffies; | |
1678 | unsigned long phsize; | |
1679 | ||
75fbfd33 | 1680 | INIT_LIST_HEAD(&tbl->parms_list); |
58956317 | 1681 | INIT_LIST_HEAD(&tbl->gc_list); |
75fbfd33 | 1682 | list_add(&tbl->parms.list, &tbl->parms_list); |
e42ea986 | 1683 | write_pnet(&tbl->parms.net, &init_net); |
6343944b | 1684 | refcount_set(&tbl->parms.refcnt, 1); |
1da177e4 | 1685 | tbl->parms.reachable_time = |
1f9248e5 | 1686 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
1da177e4 | 1687 | |
1da177e4 LT |
1688 | tbl->stats = alloc_percpu(struct neigh_statistics); |
1689 | if (!tbl->stats) | |
1690 | panic("cannot create neighbour cache statistics"); | |
4ec93edb | 1691 | |
1da177e4 | 1692 | #ifdef CONFIG_PROC_FS |
71a5053a CH |
1693 | if (!proc_create_seq_data(tbl->id, 0, init_net.proc_net_stat, |
1694 | &neigh_stat_seq_ops, tbl)) | |
1da177e4 | 1695 | panic("cannot create neighbour proc dir entry"); |
1da177e4 LT |
1696 | #endif |
1697 | ||
cd089336 | 1698 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
1da177e4 LT |
1699 | |
1700 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); | |
77d04bd9 | 1701 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
1da177e4 | 1702 | |
d6bf7817 | 1703 | if (!tbl->nht || !tbl->phash_buckets) |
1da177e4 LT |
1704 | panic("cannot allocate neighbour cache hashes"); |
1705 | ||
08433eff YH |
1706 | if (!tbl->entry_size) |
1707 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + | |
1708 | tbl->key_len, NEIGH_PRIV_ALIGN); | |
1709 | else | |
1710 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); | |
1711 | ||
1da177e4 | 1712 | rwlock_init(&tbl->lock); |
203b42f7 | 1713 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
f618002b VK |
1714 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
1715 | tbl->parms.reachable_time); | |
e99e88a9 | 1716 | timer_setup(&tbl->proxy_timer, neigh_proxy_process, 0); |
c2ecba71 PE |
1717 | skb_queue_head_init_class(&tbl->proxy_queue, |
1718 | &neigh_table_proxy_queue_class); | |
1da177e4 LT |
1719 | |
1720 | tbl->last_flush = now; | |
1721 | tbl->last_rand = now + tbl->parms.reachable_time * 20; | |
bd89efc5 | 1722 | |
d7480fd3 | 1723 | neigh_tables[index] = tbl; |
1da177e4 | 1724 | } |
0a204500 | 1725 | EXPORT_SYMBOL(neigh_table_init); |
1da177e4 | 1726 | |
d7480fd3 | 1727 | int neigh_table_clear(int index, struct neigh_table *tbl) |
1da177e4 | 1728 | { |
d7480fd3 | 1729 | neigh_tables[index] = NULL; |
1da177e4 | 1730 | /* It is not clean... Fix it to unload IPv6 module safely */ |
a5c30b34 | 1731 | cancel_delayed_work_sync(&tbl->gc_work); |
1da177e4 LT |
1732 | del_timer_sync(&tbl->proxy_timer); |
1733 | pneigh_queue_purge(&tbl->proxy_queue); | |
1734 | neigh_ifdown(tbl, NULL); | |
1735 | if (atomic_read(&tbl->entries)) | |
e005d193 | 1736 | pr_crit("neighbour leakage\n"); |
1da177e4 | 1737 | |
6193d2be ED |
1738 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
1739 | neigh_hash_free_rcu); | |
d6bf7817 | 1740 | tbl->nht = NULL; |
1da177e4 LT |
1741 | |
1742 | kfree(tbl->phash_buckets); | |
1743 | tbl->phash_buckets = NULL; | |
1744 | ||
3f192b5c AD |
1745 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
1746 | ||
3fcde74b KK |
1747 | free_percpu(tbl->stats); |
1748 | tbl->stats = NULL; | |
1749 | ||
1da177e4 LT |
1750 | return 0; |
1751 | } | |
0a204500 | 1752 | EXPORT_SYMBOL(neigh_table_clear); |
1da177e4 | 1753 | |
d7480fd3 WC |
1754 | static struct neigh_table *neigh_find_table(int family) |
1755 | { | |
1756 | struct neigh_table *tbl = NULL; | |
1757 | ||
1758 | switch (family) { | |
1759 | case AF_INET: | |
1760 | tbl = neigh_tables[NEIGH_ARP_TABLE]; | |
1761 | break; | |
1762 | case AF_INET6: | |
1763 | tbl = neigh_tables[NEIGH_ND_TABLE]; | |
1764 | break; | |
1765 | case AF_DECnet: | |
1766 | tbl = neigh_tables[NEIGH_DN_TABLE]; | |
1767 | break; | |
1768 | } | |
1769 | ||
1770 | return tbl; | |
1771 | } | |
1772 | ||
82cbb5c6 RP |
1773 | const struct nla_policy nda_policy[NDA_MAX+1] = { |
1774 | [NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
1775 | [NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN }, | |
1776 | [NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) }, | |
1777 | [NDA_PROBES] = { .type = NLA_U32 }, | |
1778 | [NDA_VLAN] = { .type = NLA_U16 }, | |
1779 | [NDA_PORT] = { .type = NLA_U16 }, | |
1780 | [NDA_VNI] = { .type = NLA_U32 }, | |
1781 | [NDA_IFINDEX] = { .type = NLA_U32 }, | |
1782 | [NDA_MASTER] = { .type = NLA_U32 }, | |
a9cd3439 | 1783 | [NDA_PROTOCOL] = { .type = NLA_U8 }, |
82cbb5c6 RP |
1784 | }; |
1785 | ||
c21ef3e3 DA |
1786 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, |
1787 | struct netlink_ext_ack *extack) | |
1da177e4 | 1788 | { |
3b1e0a65 | 1789 | struct net *net = sock_net(skb->sk); |
a14a49d2 TG |
1790 | struct ndmsg *ndm; |
1791 | struct nlattr *dst_attr; | |
1da177e4 | 1792 | struct neigh_table *tbl; |
d7480fd3 | 1793 | struct neighbour *neigh; |
1da177e4 | 1794 | struct net_device *dev = NULL; |
a14a49d2 | 1795 | int err = -EINVAL; |
1da177e4 | 1796 | |
110b2499 | 1797 | ASSERT_RTNL(); |
a14a49d2 | 1798 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
1da177e4 LT |
1799 | goto out; |
1800 | ||
a14a49d2 | 1801 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
7a35a50d DA |
1802 | if (!dst_attr) { |
1803 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
a14a49d2 | 1804 | goto out; |
7a35a50d | 1805 | } |
a14a49d2 TG |
1806 | |
1807 | ndm = nlmsg_data(nlh); | |
1808 | if (ndm->ndm_ifindex) { | |
110b2499 | 1809 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
a14a49d2 TG |
1810 | if (dev == NULL) { |
1811 | err = -ENODEV; | |
1812 | goto out; | |
1813 | } | |
1814 | } | |
1815 | ||
d7480fd3 WC |
1816 | tbl = neigh_find_table(ndm->ndm_family); |
1817 | if (tbl == NULL) | |
1818 | return -EAFNOSUPPORT; | |
1da177e4 | 1819 | |
7a35a50d DA |
1820 | if (nla_len(dst_attr) < (int)tbl->key_len) { |
1821 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1822 | goto out; |
7a35a50d | 1823 | } |
1da177e4 | 1824 | |
d7480fd3 WC |
1825 | if (ndm->ndm_flags & NTF_PROXY) { |
1826 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); | |
1827 | goto out; | |
1828 | } | |
1da177e4 | 1829 | |
d7480fd3 WC |
1830 | if (dev == NULL) |
1831 | goto out; | |
a14a49d2 | 1832 | |
d7480fd3 WC |
1833 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
1834 | if (neigh == NULL) { | |
1835 | err = -ENOENT; | |
110b2499 | 1836 | goto out; |
1da177e4 | 1837 | } |
d7480fd3 | 1838 | |
7a35a50d DA |
1839 | err = __neigh_update(neigh, NULL, NUD_FAILED, |
1840 | NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN, | |
1841 | NETLINK_CB(skb).portid, extack); | |
5071034e | 1842 | write_lock_bh(&tbl->lock); |
d7480fd3 | 1843 | neigh_release(neigh); |
5071034e SV |
1844 | neigh_remove_one(neigh, tbl); |
1845 | write_unlock_bh(&tbl->lock); | |
a14a49d2 | 1846 | |
1da177e4 LT |
1847 | out: |
1848 | return err; | |
1849 | } | |
1850 | ||
c21ef3e3 DA |
1851 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, |
1852 | struct netlink_ext_ack *extack) | |
1da177e4 | 1853 | { |
f7aa74e4 RP |
1854 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE | |
1855 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER; | |
3b1e0a65 | 1856 | struct net *net = sock_net(skb->sk); |
5208debd TG |
1857 | struct ndmsg *ndm; |
1858 | struct nlattr *tb[NDA_MAX+1]; | |
1da177e4 LT |
1859 | struct neigh_table *tbl; |
1860 | struct net_device *dev = NULL; | |
d7480fd3 WC |
1861 | struct neighbour *neigh; |
1862 | void *dst, *lladdr; | |
df9b0e30 | 1863 | u8 protocol = 0; |
5208debd | 1864 | int err; |
1da177e4 | 1865 | |
110b2499 | 1866 | ASSERT_RTNL(); |
8cb08174 JB |
1867 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX, |
1868 | nda_policy, extack); | |
5208debd | 1869 | if (err < 0) |
1da177e4 LT |
1870 | goto out; |
1871 | ||
5208debd | 1872 | err = -EINVAL; |
7a35a50d DA |
1873 | if (!tb[NDA_DST]) { |
1874 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
5208debd | 1875 | goto out; |
7a35a50d | 1876 | } |
5208debd TG |
1877 | |
1878 | ndm = nlmsg_data(nlh); | |
1879 | if (ndm->ndm_ifindex) { | |
110b2499 | 1880 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
5208debd TG |
1881 | if (dev == NULL) { |
1882 | err = -ENODEV; | |
1883 | goto out; | |
1884 | } | |
1885 | ||
7a35a50d DA |
1886 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) { |
1887 | NL_SET_ERR_MSG(extack, "Invalid link address"); | |
110b2499 | 1888 | goto out; |
7a35a50d | 1889 | } |
5208debd TG |
1890 | } |
1891 | ||
d7480fd3 WC |
1892 | tbl = neigh_find_table(ndm->ndm_family); |
1893 | if (tbl == NULL) | |
1894 | return -EAFNOSUPPORT; | |
1da177e4 | 1895 | |
7a35a50d DA |
1896 | if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) { |
1897 | NL_SET_ERR_MSG(extack, "Invalid network address"); | |
d7480fd3 | 1898 | goto out; |
7a35a50d DA |
1899 | } |
1900 | ||
d7480fd3 WC |
1901 | dst = nla_data(tb[NDA_DST]); |
1902 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; | |
1da177e4 | 1903 | |
a9cd3439 | 1904 | if (tb[NDA_PROTOCOL]) |
df9b0e30 | 1905 | protocol = nla_get_u8(tb[NDA_PROTOCOL]); |
df9b0e30 | 1906 | |
d7480fd3 WC |
1907 | if (ndm->ndm_flags & NTF_PROXY) { |
1908 | struct pneigh_entry *pn; | |
1909 | ||
1910 | err = -ENOBUFS; | |
1911 | pn = pneigh_lookup(tbl, net, dst, dev, 1); | |
1912 | if (pn) { | |
1913 | pn->flags = ndm->ndm_flags; | |
df9b0e30 DA |
1914 | if (protocol) |
1915 | pn->protocol = protocol; | |
d7480fd3 WC |
1916 | err = 0; |
1917 | } | |
1918 | goto out; | |
1919 | } | |
1da177e4 | 1920 | |
7a35a50d DA |
1921 | if (!dev) { |
1922 | NL_SET_ERR_MSG(extack, "Device not specified"); | |
d7480fd3 | 1923 | goto out; |
7a35a50d | 1924 | } |
62dd9318 | 1925 | |
b8fb1ab4 DA |
1926 | if (tbl->allow_add && !tbl->allow_add(dev, extack)) { |
1927 | err = -EINVAL; | |
1928 | goto out; | |
1929 | } | |
1930 | ||
d7480fd3 WC |
1931 | neigh = neigh_lookup(tbl, dst, dev); |
1932 | if (neigh == NULL) { | |
e997f8a2 DA |
1933 | bool exempt_from_gc; |
1934 | ||
d7480fd3 WC |
1935 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
1936 | err = -ENOENT; | |
110b2499 | 1937 | goto out; |
1da177e4 LT |
1938 | } |
1939 | ||
e997f8a2 DA |
1940 | exempt_from_gc = ndm->ndm_state & NUD_PERMANENT || |
1941 | ndm->ndm_flags & NTF_EXT_LEARNED; | |
1942 | neigh = ___neigh_create(tbl, dst, dev, exempt_from_gc, true); | |
d7480fd3 WC |
1943 | if (IS_ERR(neigh)) { |
1944 | err = PTR_ERR(neigh); | |
1945 | goto out; | |
1946 | } | |
1947 | } else { | |
1948 | if (nlh->nlmsg_flags & NLM_F_EXCL) { | |
1949 | err = -EEXIST; | |
1950 | neigh_release(neigh); | |
110b2499 | 1951 | goto out; |
5208debd | 1952 | } |
1da177e4 | 1953 | |
d7480fd3 | 1954 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
f7aa74e4 RP |
1955 | flags &= ~(NEIGH_UPDATE_F_OVERRIDE | |
1956 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1da177e4 LT |
1957 | } |
1958 | ||
38212bb3 RM |
1959 | if (protocol) |
1960 | neigh->protocol = protocol; | |
1961 | ||
9ce33e46 RP |
1962 | if (ndm->ndm_flags & NTF_EXT_LEARNED) |
1963 | flags |= NEIGH_UPDATE_F_EXT_LEARNED; | |
1964 | ||
f7aa74e4 RP |
1965 | if (ndm->ndm_flags & NTF_ROUTER) |
1966 | flags |= NEIGH_UPDATE_F_ISROUTER; | |
1967 | ||
d7480fd3 WC |
1968 | if (ndm->ndm_flags & NTF_USE) { |
1969 | neigh_event_send(neigh, NULL); | |
1970 | err = 0; | |
1971 | } else | |
7a35a50d DA |
1972 | err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags, |
1973 | NETLINK_CB(skb).portid, extack); | |
df9b0e30 | 1974 | |
d7480fd3 WC |
1975 | neigh_release(neigh); |
1976 | ||
1da177e4 LT |
1977 | out: |
1978 | return err; | |
1979 | } | |
1980 | ||
c7fb64db TG |
1981 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
1982 | { | |
ca860fb3 TG |
1983 | struct nlattr *nest; |
1984 | ||
ae0be8de | 1985 | nest = nla_nest_start_noflag(skb, NDTA_PARMS); |
ca860fb3 TG |
1986 | if (nest == NULL) |
1987 | return -ENOBUFS; | |
c7fb64db | 1988 | |
9a6308d7 DM |
1989 | if ((parms->dev && |
1990 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || | |
6343944b | 1991 | nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) || |
1f9248e5 JP |
1992 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
1993 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || | |
9a6308d7 DM |
1994 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
1995 | nla_put_u32(skb, NDTPA_QUEUE_LEN, | |
1f9248e5 JP |
1996 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
1997 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || | |
1998 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || | |
1999 | nla_put_u32(skb, NDTPA_UCAST_PROBES, | |
2000 | NEIGH_VAR(parms, UCAST_PROBES)) || | |
2001 | nla_put_u32(skb, NDTPA_MCAST_PROBES, | |
2002 | NEIGH_VAR(parms, MCAST_PROBES)) || | |
8da86466 YH |
2003 | nla_put_u32(skb, NDTPA_MCAST_REPROBES, |
2004 | NEIGH_VAR(parms, MCAST_REPROBES)) || | |
2175d87c ND |
2005 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time, |
2006 | NDTPA_PAD) || | |
9a6308d7 | 2007 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
2175d87c | 2008 | NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) || |
1f9248e5 | 2009 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
2175d87c | 2010 | NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) || |
9a6308d7 | 2011 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
2175d87c | 2012 | NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) || |
1f9248e5 | 2013 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
2175d87c | 2014 | NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) || |
1f9248e5 | 2015 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
2175d87c | 2016 | NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) || |
1f9248e5 | 2017 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
2175d87c | 2018 | NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) || |
1f9248e5 | 2019 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
2175d87c | 2020 | NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD)) |
9a6308d7 | 2021 | goto nla_put_failure; |
ca860fb3 | 2022 | return nla_nest_end(skb, nest); |
c7fb64db | 2023 | |
ca860fb3 | 2024 | nla_put_failure: |
bc3ed28c TG |
2025 | nla_nest_cancel(skb, nest); |
2026 | return -EMSGSIZE; | |
c7fb64db TG |
2027 | } |
2028 | ||
ca860fb3 TG |
2029 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
2030 | u32 pid, u32 seq, int type, int flags) | |
c7fb64db TG |
2031 | { |
2032 | struct nlmsghdr *nlh; | |
2033 | struct ndtmsg *ndtmsg; | |
2034 | ||
ca860fb3 TG |
2035 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2036 | if (nlh == NULL) | |
26932566 | 2037 | return -EMSGSIZE; |
c7fb64db | 2038 | |
ca860fb3 | 2039 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2040 | |
2041 | read_lock_bh(&tbl->lock); | |
2042 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2043 | ndtmsg->ndtm_pad1 = 0; |
2044 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2045 | |
9a6308d7 | 2046 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
2175d87c | 2047 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) || |
9a6308d7 DM |
2048 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
2049 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || | |
2050 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) | |
2051 | goto nla_put_failure; | |
c7fb64db TG |
2052 | { |
2053 | unsigned long now = jiffies; | |
9d027e3a ED |
2054 | long flush_delta = now - tbl->last_flush; |
2055 | long rand_delta = now - tbl->last_rand; | |
d6bf7817 | 2056 | struct neigh_hash_table *nht; |
c7fb64db TG |
2057 | struct ndt_config ndc = { |
2058 | .ndtc_key_len = tbl->key_len, | |
2059 | .ndtc_entry_size = tbl->entry_size, | |
2060 | .ndtc_entries = atomic_read(&tbl->entries), | |
2061 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), | |
2062 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), | |
c7fb64db TG |
2063 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
2064 | }; | |
2065 | ||
d6bf7817 ED |
2066 | rcu_read_lock_bh(); |
2067 | nht = rcu_dereference_bh(tbl->nht); | |
2c2aba6c | 2068 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
cd089336 | 2069 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
d6bf7817 ED |
2070 | rcu_read_unlock_bh(); |
2071 | ||
9a6308d7 DM |
2072 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
2073 | goto nla_put_failure; | |
c7fb64db TG |
2074 | } |
2075 | ||
2076 | { | |
2077 | int cpu; | |
2078 | struct ndt_stats ndst; | |
2079 | ||
2080 | memset(&ndst, 0, sizeof(ndst)); | |
2081 | ||
6f912042 | 2082 | for_each_possible_cpu(cpu) { |
c7fb64db TG |
2083 | struct neigh_statistics *st; |
2084 | ||
c7fb64db TG |
2085 | st = per_cpu_ptr(tbl->stats, cpu); |
2086 | ndst.ndts_allocs += st->allocs; | |
2087 | ndst.ndts_destroys += st->destroys; | |
2088 | ndst.ndts_hash_grows += st->hash_grows; | |
2089 | ndst.ndts_res_failed += st->res_failed; | |
2090 | ndst.ndts_lookups += st->lookups; | |
2091 | ndst.ndts_hits += st->hits; | |
2092 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; | |
2093 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; | |
2094 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; | |
2095 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; | |
fb811395 | 2096 | ndst.ndts_table_fulls += st->table_fulls; |
c7fb64db TG |
2097 | } |
2098 | ||
b676338f ND |
2099 | if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst, |
2100 | NDTA_PAD)) | |
9a6308d7 | 2101 | goto nla_put_failure; |
c7fb64db TG |
2102 | } |
2103 | ||
2104 | BUG_ON(tbl->parms.dev); | |
2105 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) | |
ca860fb3 | 2106 | goto nla_put_failure; |
c7fb64db TG |
2107 | |
2108 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2109 | nlmsg_end(skb, nlh); |
2110 | return 0; | |
c7fb64db | 2111 | |
ca860fb3 | 2112 | nla_put_failure: |
c7fb64db | 2113 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2114 | nlmsg_cancel(skb, nlh); |
2115 | return -EMSGSIZE; | |
c7fb64db TG |
2116 | } |
2117 | ||
ca860fb3 TG |
2118 | static int neightbl_fill_param_info(struct sk_buff *skb, |
2119 | struct neigh_table *tbl, | |
c7fb64db | 2120 | struct neigh_parms *parms, |
ca860fb3 TG |
2121 | u32 pid, u32 seq, int type, |
2122 | unsigned int flags) | |
c7fb64db TG |
2123 | { |
2124 | struct ndtmsg *ndtmsg; | |
2125 | struct nlmsghdr *nlh; | |
2126 | ||
ca860fb3 TG |
2127 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
2128 | if (nlh == NULL) | |
26932566 | 2129 | return -EMSGSIZE; |
c7fb64db | 2130 | |
ca860fb3 | 2131 | ndtmsg = nlmsg_data(nlh); |
c7fb64db TG |
2132 | |
2133 | read_lock_bh(&tbl->lock); | |
2134 | ndtmsg->ndtm_family = tbl->family; | |
9ef1d4c7 PM |
2135 | ndtmsg->ndtm_pad1 = 0; |
2136 | ndtmsg->ndtm_pad2 = 0; | |
c7fb64db | 2137 | |
ca860fb3 TG |
2138 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
2139 | neightbl_fill_parms(skb, parms) < 0) | |
2140 | goto errout; | |
c7fb64db TG |
2141 | |
2142 | read_unlock_bh(&tbl->lock); | |
053c095a JB |
2143 | nlmsg_end(skb, nlh); |
2144 | return 0; | |
ca860fb3 | 2145 | errout: |
c7fb64db | 2146 | read_unlock_bh(&tbl->lock); |
26932566 PM |
2147 | nlmsg_cancel(skb, nlh); |
2148 | return -EMSGSIZE; | |
c7fb64db | 2149 | } |
4ec93edb | 2150 | |
ef7c79ed | 2151 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
6b3f8674 TG |
2152 | [NDTA_NAME] = { .type = NLA_STRING }, |
2153 | [NDTA_THRESH1] = { .type = NLA_U32 }, | |
2154 | [NDTA_THRESH2] = { .type = NLA_U32 }, | |
2155 | [NDTA_THRESH3] = { .type = NLA_U32 }, | |
2156 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, | |
2157 | [NDTA_PARMS] = { .type = NLA_NESTED }, | |
2158 | }; | |
2159 | ||
ef7c79ed | 2160 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
6b3f8674 TG |
2161 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
2162 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, | |
2163 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, | |
2164 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, | |
2165 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, | |
2166 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, | |
8da86466 | 2167 | [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 }, |
6b3f8674 TG |
2168 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
2169 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, | |
2170 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, | |
2171 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, | |
2172 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, | |
2173 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, | |
2174 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, | |
2175 | }; | |
2176 | ||
c21ef3e3 DA |
2177 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, |
2178 | struct netlink_ext_ack *extack) | |
c7fb64db | 2179 | { |
3b1e0a65 | 2180 | struct net *net = sock_net(skb->sk); |
c7fb64db | 2181 | struct neigh_table *tbl; |
6b3f8674 TG |
2182 | struct ndtmsg *ndtmsg; |
2183 | struct nlattr *tb[NDTA_MAX+1]; | |
d7480fd3 WC |
2184 | bool found = false; |
2185 | int err, tidx; | |
c7fb64db | 2186 | |
8cb08174 JB |
2187 | err = nlmsg_parse_deprecated(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
2188 | nl_neightbl_policy, extack); | |
6b3f8674 TG |
2189 | if (err < 0) |
2190 | goto errout; | |
c7fb64db | 2191 | |
6b3f8674 TG |
2192 | if (tb[NDTA_NAME] == NULL) { |
2193 | err = -EINVAL; | |
2194 | goto errout; | |
2195 | } | |
2196 | ||
2197 | ndtmsg = nlmsg_data(nlh); | |
d7480fd3 WC |
2198 | |
2199 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { | |
2200 | tbl = neigh_tables[tidx]; | |
2201 | if (!tbl) | |
2202 | continue; | |
c7fb64db TG |
2203 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
2204 | continue; | |
d7480fd3 WC |
2205 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) { |
2206 | found = true; | |
c7fb64db | 2207 | break; |
d7480fd3 | 2208 | } |
c7fb64db TG |
2209 | } |
2210 | ||
d7480fd3 WC |
2211 | if (!found) |
2212 | return -ENOENT; | |
c7fb64db | 2213 | |
4ec93edb | 2214 | /* |
c7fb64db TG |
2215 | * We acquire tbl->lock to be nice to the periodic timers and |
2216 | * make sure they always see a consistent set of values. | |
2217 | */ | |
2218 | write_lock_bh(&tbl->lock); | |
2219 | ||
6b3f8674 TG |
2220 | if (tb[NDTA_PARMS]) { |
2221 | struct nlattr *tbp[NDTPA_MAX+1]; | |
c7fb64db | 2222 | struct neigh_parms *p; |
6b3f8674 | 2223 | int i, ifindex = 0; |
c7fb64db | 2224 | |
8cb08174 JB |
2225 | err = nla_parse_nested_deprecated(tbp, NDTPA_MAX, |
2226 | tb[NDTA_PARMS], | |
2227 | nl_ntbl_parm_policy, extack); | |
6b3f8674 TG |
2228 | if (err < 0) |
2229 | goto errout_tbl_lock; | |
c7fb64db | 2230 | |
6b3f8674 TG |
2231 | if (tbp[NDTPA_IFINDEX]) |
2232 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); | |
c7fb64db | 2233 | |
97fd5bc7 | 2234 | p = lookup_neigh_parms(tbl, net, ifindex); |
c7fb64db TG |
2235 | if (p == NULL) { |
2236 | err = -ENOENT; | |
6b3f8674 | 2237 | goto errout_tbl_lock; |
c7fb64db | 2238 | } |
c7fb64db | 2239 | |
6b3f8674 TG |
2240 | for (i = 1; i <= NDTPA_MAX; i++) { |
2241 | if (tbp[i] == NULL) | |
2242 | continue; | |
c7fb64db | 2243 | |
6b3f8674 TG |
2244 | switch (i) { |
2245 | case NDTPA_QUEUE_LEN: | |
1f9248e5 JP |
2246 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2247 | nla_get_u32(tbp[i]) * | |
2248 | SKB_TRUESIZE(ETH_FRAME_LEN)); | |
8b5c171b ED |
2249 | break; |
2250 | case NDTPA_QUEUE_LENBYTES: | |
1f9248e5 JP |
2251 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
2252 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2253 | break; |
2254 | case NDTPA_PROXY_QLEN: | |
1f9248e5 JP |
2255 | NEIGH_VAR_SET(p, PROXY_QLEN, |
2256 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2257 | break; |
2258 | case NDTPA_APP_PROBES: | |
1f9248e5 JP |
2259 | NEIGH_VAR_SET(p, APP_PROBES, |
2260 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2261 | break; |
2262 | case NDTPA_UCAST_PROBES: | |
1f9248e5 JP |
2263 | NEIGH_VAR_SET(p, UCAST_PROBES, |
2264 | nla_get_u32(tbp[i])); | |
6b3f8674 TG |
2265 | break; |
2266 | case NDTPA_MCAST_PROBES: | |
1f9248e5 JP |
2267 | NEIGH_VAR_SET(p, MCAST_PROBES, |
2268 | nla_get_u32(tbp[i])); | |
6b3f8674 | 2269 | break; |
8da86466 YH |
2270 | case NDTPA_MCAST_REPROBES: |
2271 | NEIGH_VAR_SET(p, MCAST_REPROBES, | |
2272 | nla_get_u32(tbp[i])); | |
2273 | break; | |
6b3f8674 | 2274 | case NDTPA_BASE_REACHABLE_TIME: |
1f9248e5 JP |
2275 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
2276 | nla_get_msecs(tbp[i])); | |
4bf6980d JFR |
2277 | /* update reachable_time as well, otherwise, the change will |
2278 | * only be effective after the next time neigh_periodic_work | |
2279 | * decides to recompute it (can be multiple minutes) | |
2280 | */ | |
2281 | p->reachable_time = | |
2282 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
6b3f8674 TG |
2283 | break; |
2284 | case NDTPA_GC_STALETIME: | |
1f9248e5 JP |
2285 | NEIGH_VAR_SET(p, GC_STALETIME, |
2286 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2287 | break; |
2288 | case NDTPA_DELAY_PROBE_TIME: | |
1f9248e5 JP |
2289 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
2290 | nla_get_msecs(tbp[i])); | |
2a4501ae | 2291 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); |
6b3f8674 TG |
2292 | break; |
2293 | case NDTPA_RETRANS_TIME: | |
1f9248e5 JP |
2294 | NEIGH_VAR_SET(p, RETRANS_TIME, |
2295 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2296 | break; |
2297 | case NDTPA_ANYCAST_DELAY: | |
3977458c JP |
2298 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
2299 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2300 | break; |
2301 | case NDTPA_PROXY_DELAY: | |
3977458c JP |
2302 | NEIGH_VAR_SET(p, PROXY_DELAY, |
2303 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2304 | break; |
2305 | case NDTPA_LOCKTIME: | |
3977458c JP |
2306 | NEIGH_VAR_SET(p, LOCKTIME, |
2307 | nla_get_msecs(tbp[i])); | |
6b3f8674 TG |
2308 | break; |
2309 | } | |
2310 | } | |
2311 | } | |
c7fb64db | 2312 | |
dc25c676 G |
2313 | err = -ENOENT; |
2314 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || | |
2315 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && | |
2316 | !net_eq(net, &init_net)) | |
2317 | goto errout_tbl_lock; | |
2318 | ||
6b3f8674 TG |
2319 | if (tb[NDTA_THRESH1]) |
2320 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); | |
c7fb64db | 2321 | |
6b3f8674 TG |
2322 | if (tb[NDTA_THRESH2]) |
2323 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); | |
c7fb64db | 2324 | |
6b3f8674 TG |
2325 | if (tb[NDTA_THRESH3]) |
2326 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); | |
c7fb64db | 2327 | |
6b3f8674 TG |
2328 | if (tb[NDTA_GC_INTERVAL]) |
2329 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); | |
c7fb64db TG |
2330 | |
2331 | err = 0; | |
2332 | ||
6b3f8674 | 2333 | errout_tbl_lock: |
c7fb64db | 2334 | write_unlock_bh(&tbl->lock); |
6b3f8674 | 2335 | errout: |
c7fb64db TG |
2336 | return err; |
2337 | } | |
2338 | ||
9632d47f DA |
2339 | static int neightbl_valid_dump_info(const struct nlmsghdr *nlh, |
2340 | struct netlink_ext_ack *extack) | |
2341 | { | |
2342 | struct ndtmsg *ndtm; | |
2343 | ||
2344 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) { | |
2345 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request"); | |
2346 | return -EINVAL; | |
2347 | } | |
2348 | ||
2349 | ndtm = nlmsg_data(nlh); | |
2350 | if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) { | |
2351 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request"); | |
2352 | return -EINVAL; | |
2353 | } | |
2354 | ||
2355 | if (nlmsg_attrlen(nlh, sizeof(*ndtm))) { | |
2356 | NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request"); | |
2357 | return -EINVAL; | |
2358 | } | |
2359 | ||
2360 | return 0; | |
2361 | } | |
2362 | ||
c8822a4e | 2363 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
c7fb64db | 2364 | { |
9632d47f | 2365 | const struct nlmsghdr *nlh = cb->nlh; |
3b1e0a65 | 2366 | struct net *net = sock_net(skb->sk); |
ca860fb3 TG |
2367 | int family, tidx, nidx = 0; |
2368 | int tbl_skip = cb->args[0]; | |
2369 | int neigh_skip = cb->args[1]; | |
c7fb64db TG |
2370 | struct neigh_table *tbl; |
2371 | ||
9632d47f DA |
2372 | if (cb->strict_check) { |
2373 | int err = neightbl_valid_dump_info(nlh, cb->extack); | |
2374 | ||
2375 | if (err < 0) | |
2376 | return err; | |
2377 | } | |
2378 | ||
2379 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; | |
c7fb64db | 2380 | |
d7480fd3 | 2381 | for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) { |
c7fb64db TG |
2382 | struct neigh_parms *p; |
2383 | ||
d7480fd3 WC |
2384 | tbl = neigh_tables[tidx]; |
2385 | if (!tbl) | |
2386 | continue; | |
2387 | ||
ca860fb3 | 2388 | if (tidx < tbl_skip || (family && tbl->family != family)) |
c7fb64db TG |
2389 | continue; |
2390 | ||
15e47304 | 2391 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
9632d47f | 2392 | nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
7b46a644 | 2393 | NLM_F_MULTI) < 0) |
c7fb64db TG |
2394 | break; |
2395 | ||
75fbfd33 ND |
2396 | nidx = 0; |
2397 | p = list_next_entry(&tbl->parms, list); | |
2398 | list_for_each_entry_from(p, &tbl->parms_list, list) { | |
878628fb | 2399 | if (!net_eq(neigh_parms_net(p), net)) |
426b5303 EB |
2400 | continue; |
2401 | ||
efc683fc GK |
2402 | if (nidx < neigh_skip) |
2403 | goto next; | |
c7fb64db | 2404 | |
ca860fb3 | 2405 | if (neightbl_fill_param_info(skb, tbl, p, |
15e47304 | 2406 | NETLINK_CB(cb->skb).portid, |
9632d47f | 2407 | nlh->nlmsg_seq, |
ca860fb3 | 2408 | RTM_NEWNEIGHTBL, |
7b46a644 | 2409 | NLM_F_MULTI) < 0) |
c7fb64db | 2410 | goto out; |
efc683fc GK |
2411 | next: |
2412 | nidx++; | |
c7fb64db TG |
2413 | } |
2414 | ||
ca860fb3 | 2415 | neigh_skip = 0; |
c7fb64db TG |
2416 | } |
2417 | out: | |
ca860fb3 TG |
2418 | cb->args[0] = tidx; |
2419 | cb->args[1] = nidx; | |
c7fb64db TG |
2420 | |
2421 | return skb->len; | |
2422 | } | |
1da177e4 | 2423 | |
8b8aec50 TG |
2424 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
2425 | u32 pid, u32 seq, int type, unsigned int flags) | |
1da177e4 LT |
2426 | { |
2427 | unsigned long now = jiffies; | |
1da177e4 | 2428 | struct nda_cacheinfo ci; |
8b8aec50 TG |
2429 | struct nlmsghdr *nlh; |
2430 | struct ndmsg *ndm; | |
2431 | ||
2432 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2433 | if (nlh == NULL) | |
26932566 | 2434 | return -EMSGSIZE; |
1da177e4 | 2435 | |
8b8aec50 TG |
2436 | ndm = nlmsg_data(nlh); |
2437 | ndm->ndm_family = neigh->ops->family; | |
9ef1d4c7 PM |
2438 | ndm->ndm_pad1 = 0; |
2439 | ndm->ndm_pad2 = 0; | |
8b8aec50 TG |
2440 | ndm->ndm_flags = neigh->flags; |
2441 | ndm->ndm_type = neigh->type; | |
2442 | ndm->ndm_ifindex = neigh->dev->ifindex; | |
1da177e4 | 2443 | |
9a6308d7 DM |
2444 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
2445 | goto nla_put_failure; | |
8b8aec50 TG |
2446 | |
2447 | read_lock_bh(&neigh->lock); | |
2448 | ndm->ndm_state = neigh->nud_state; | |
0ed8ddf4 ED |
2449 | if (neigh->nud_state & NUD_VALID) { |
2450 | char haddr[MAX_ADDR_LEN]; | |
2451 | ||
2452 | neigh_ha_snapshot(haddr, neigh, neigh->dev); | |
2453 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { | |
2454 | read_unlock_bh(&neigh->lock); | |
2455 | goto nla_put_failure; | |
2456 | } | |
8b8aec50 TG |
2457 | } |
2458 | ||
b9f5f52c SH |
2459 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
2460 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); | |
2461 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); | |
9f237430 | 2462 | ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1; |
8b8aec50 TG |
2463 | read_unlock_bh(&neigh->lock); |
2464 | ||
9a6308d7 DM |
2465 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
2466 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
2467 | goto nla_put_failure; | |
8b8aec50 | 2468 | |
df9b0e30 DA |
2469 | if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol)) |
2470 | goto nla_put_failure; | |
2471 | ||
053c095a JB |
2472 | nlmsg_end(skb, nlh); |
2473 | return 0; | |
8b8aec50 TG |
2474 | |
2475 | nla_put_failure: | |
26932566 PM |
2476 | nlmsg_cancel(skb, nlh); |
2477 | return -EMSGSIZE; | |
1da177e4 LT |
2478 | } |
2479 | ||
84920c14 TZ |
2480 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
2481 | u32 pid, u32 seq, int type, unsigned int flags, | |
2482 | struct neigh_table *tbl) | |
2483 | { | |
2484 | struct nlmsghdr *nlh; | |
2485 | struct ndmsg *ndm; | |
2486 | ||
2487 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); | |
2488 | if (nlh == NULL) | |
2489 | return -EMSGSIZE; | |
2490 | ||
2491 | ndm = nlmsg_data(nlh); | |
2492 | ndm->ndm_family = tbl->family; | |
2493 | ndm->ndm_pad1 = 0; | |
2494 | ndm->ndm_pad2 = 0; | |
2495 | ndm->ndm_flags = pn->flags | NTF_PROXY; | |
545469f7 | 2496 | ndm->ndm_type = RTN_UNICAST; |
6adc5fd6 | 2497 | ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0; |
84920c14 TZ |
2498 | ndm->ndm_state = NUD_NONE; |
2499 | ||
9a6308d7 DM |
2500 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
2501 | goto nla_put_failure; | |
84920c14 | 2502 | |
df9b0e30 DA |
2503 | if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol)) |
2504 | goto nla_put_failure; | |
2505 | ||
053c095a JB |
2506 | nlmsg_end(skb, nlh); |
2507 | return 0; | |
84920c14 TZ |
2508 | |
2509 | nla_put_failure: | |
2510 | nlmsg_cancel(skb, nlh); | |
2511 | return -EMSGSIZE; | |
2512 | } | |
2513 | ||
7b8f7a40 | 2514 | static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid) |
d961db35 TG |
2515 | { |
2516 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); | |
7b8f7a40 | 2517 | __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid); |
d961db35 | 2518 | } |
1da177e4 | 2519 | |
21fdd092 DA |
2520 | static bool neigh_master_filtered(struct net_device *dev, int master_idx) |
2521 | { | |
2522 | struct net_device *master; | |
2523 | ||
2524 | if (!master_idx) | |
2525 | return false; | |
2526 | ||
aab456df | 2527 | master = dev ? netdev_master_upper_dev_get(dev) : NULL; |
21fdd092 DA |
2528 | if (!master || master->ifindex != master_idx) |
2529 | return true; | |
2530 | ||
2531 | return false; | |
2532 | } | |
2533 | ||
16660f0b DA |
2534 | static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx) |
2535 | { | |
aab456df | 2536 | if (filter_idx && (!dev || dev->ifindex != filter_idx)) |
16660f0b DA |
2537 | return true; |
2538 | ||
2539 | return false; | |
2540 | } | |
2541 | ||
6f52f80e DA |
2542 | struct neigh_dump_filter { |
2543 | int master_idx; | |
2544 | int dev_idx; | |
2545 | }; | |
2546 | ||
1da177e4 | 2547 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2548 | struct netlink_callback *cb, |
2549 | struct neigh_dump_filter *filter) | |
1da177e4 | 2550 | { |
767e97e1 | 2551 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
2552 | struct neighbour *n; |
2553 | int rc, h, s_h = cb->args[1]; | |
2554 | int idx, s_idx = idx = cb->args[2]; | |
d6bf7817 | 2555 | struct neigh_hash_table *nht; |
21fdd092 | 2556 | unsigned int flags = NLM_F_MULTI; |
21fdd092 | 2557 | |
6f52f80e DA |
2558 | if (filter->dev_idx || filter->master_idx) |
2559 | flags |= NLM_F_DUMP_FILTERED; | |
1da177e4 | 2560 | |
d6bf7817 ED |
2561 | rcu_read_lock_bh(); |
2562 | nht = rcu_dereference_bh(tbl->nht); | |
2563 | ||
4bd6683b | 2564 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
1da177e4 LT |
2565 | if (h > s_h) |
2566 | s_idx = 0; | |
767e97e1 ED |
2567 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
2568 | n != NULL; | |
2569 | n = rcu_dereference_bh(n->next)) { | |
18502acd ZS |
2570 | if (idx < s_idx || !net_eq(dev_net(n->dev), net)) |
2571 | goto next; | |
6f52f80e DA |
2572 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2573 | neigh_master_filtered(n->dev, filter->master_idx)) | |
efc683fc | 2574 | goto next; |
15e47304 | 2575 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
1da177e4 | 2576 | cb->nlh->nlmsg_seq, |
b6544c0b | 2577 | RTM_NEWNEIGH, |
21fdd092 | 2578 | flags) < 0) { |
1da177e4 LT |
2579 | rc = -1; |
2580 | goto out; | |
2581 | } | |
767e97e1 | 2582 | next: |
efc683fc | 2583 | idx++; |
1da177e4 | 2584 | } |
1da177e4 LT |
2585 | } |
2586 | rc = skb->len; | |
2587 | out: | |
d6bf7817 | 2588 | rcu_read_unlock_bh(); |
1da177e4 LT |
2589 | cb->args[1] = h; |
2590 | cb->args[2] = idx; | |
2591 | return rc; | |
2592 | } | |
2593 | ||
84920c14 | 2594 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
6f52f80e DA |
2595 | struct netlink_callback *cb, |
2596 | struct neigh_dump_filter *filter) | |
84920c14 TZ |
2597 | { |
2598 | struct pneigh_entry *n; | |
2599 | struct net *net = sock_net(skb->sk); | |
2600 | int rc, h, s_h = cb->args[3]; | |
2601 | int idx, s_idx = idx = cb->args[4]; | |
6f52f80e DA |
2602 | unsigned int flags = NLM_F_MULTI; |
2603 | ||
2604 | if (filter->dev_idx || filter->master_idx) | |
2605 | flags |= NLM_F_DUMP_FILTERED; | |
84920c14 TZ |
2606 | |
2607 | read_lock_bh(&tbl->lock); | |
2608 | ||
4bd6683b | 2609 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
84920c14 TZ |
2610 | if (h > s_h) |
2611 | s_idx = 0; | |
2612 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { | |
18502acd | 2613 | if (idx < s_idx || pneigh_net(n) != net) |
84920c14 | 2614 | goto next; |
6f52f80e DA |
2615 | if (neigh_ifindex_filtered(n->dev, filter->dev_idx) || |
2616 | neigh_master_filtered(n->dev, filter->master_idx)) | |
2617 | goto next; | |
15e47304 | 2618 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
84920c14 | 2619 | cb->nlh->nlmsg_seq, |
6f52f80e | 2620 | RTM_NEWNEIGH, flags, tbl) < 0) { |
84920c14 TZ |
2621 | read_unlock_bh(&tbl->lock); |
2622 | rc = -1; | |
2623 | goto out; | |
2624 | } | |
2625 | next: | |
2626 | idx++; | |
2627 | } | |
2628 | } | |
2629 | ||
2630 | read_unlock_bh(&tbl->lock); | |
2631 | rc = skb->len; | |
2632 | out: | |
2633 | cb->args[3] = h; | |
2634 | cb->args[4] = idx; | |
2635 | return rc; | |
2636 | ||
2637 | } | |
2638 | ||
51183d23 DA |
2639 | static int neigh_valid_dump_req(const struct nlmsghdr *nlh, |
2640 | bool strict_check, | |
2641 | struct neigh_dump_filter *filter, | |
2642 | struct netlink_ext_ack *extack) | |
2643 | { | |
2644 | struct nlattr *tb[NDA_MAX + 1]; | |
2645 | int err, i; | |
2646 | ||
2647 | if (strict_check) { | |
2648 | struct ndmsg *ndm; | |
2649 | ||
2650 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2651 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor dump request"); | |
2652 | return -EINVAL; | |
2653 | } | |
2654 | ||
2655 | ndm = nlmsg_data(nlh); | |
2656 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_ifindex || | |
c0fde870 | 2657 | ndm->ndm_state || ndm->ndm_type) { |
51183d23 DA |
2658 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor dump request"); |
2659 | return -EINVAL; | |
2660 | } | |
2661 | ||
c0fde870 DA |
2662 | if (ndm->ndm_flags & ~NTF_PROXY) { |
2663 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor dump request"); | |
2664 | return -EINVAL; | |
2665 | } | |
2666 | ||
8cb08174 JB |
2667 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), |
2668 | tb, NDA_MAX, nda_policy, | |
2669 | extack); | |
51183d23 | 2670 | } else { |
8cb08174 JB |
2671 | err = nlmsg_parse_deprecated(nlh, sizeof(struct ndmsg), tb, |
2672 | NDA_MAX, nda_policy, extack); | |
51183d23 DA |
2673 | } |
2674 | if (err < 0) | |
2675 | return err; | |
2676 | ||
2677 | for (i = 0; i <= NDA_MAX; ++i) { | |
2678 | if (!tb[i]) | |
2679 | continue; | |
2680 | ||
2681 | /* all new attributes should require strict_check */ | |
2682 | switch (i) { | |
2683 | case NDA_IFINDEX: | |
51183d23 DA |
2684 | filter->dev_idx = nla_get_u32(tb[i]); |
2685 | break; | |
2686 | case NDA_MASTER: | |
51183d23 DA |
2687 | filter->master_idx = nla_get_u32(tb[i]); |
2688 | break; | |
2689 | default: | |
2690 | if (strict_check) { | |
2691 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor dump request"); | |
2692 | return -EINVAL; | |
2693 | } | |
2694 | } | |
2695 | } | |
2696 | ||
2697 | return 0; | |
2698 | } | |
2699 | ||
c8822a4e | 2700 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 2701 | { |
6f52f80e DA |
2702 | const struct nlmsghdr *nlh = cb->nlh; |
2703 | struct neigh_dump_filter filter = {}; | |
1da177e4 LT |
2704 | struct neigh_table *tbl; |
2705 | int t, family, s_t; | |
84920c14 | 2706 | int proxy = 0; |
4bd6683b | 2707 | int err; |
1da177e4 | 2708 | |
6f52f80e | 2709 | family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family; |
84920c14 TZ |
2710 | |
2711 | /* check for full ndmsg structure presence, family member is | |
2712 | * the same for both structures | |
2713 | */ | |
6f52f80e DA |
2714 | if (nlmsg_len(nlh) >= sizeof(struct ndmsg) && |
2715 | ((struct ndmsg *)nlmsg_data(nlh))->ndm_flags == NTF_PROXY) | |
84920c14 TZ |
2716 | proxy = 1; |
2717 | ||
51183d23 DA |
2718 | err = neigh_valid_dump_req(nlh, cb->strict_check, &filter, cb->extack); |
2719 | if (err < 0 && cb->strict_check) | |
2720 | return err; | |
2721 | ||
1da177e4 LT |
2722 | s_t = cb->args[0]; |
2723 | ||
d7480fd3 WC |
2724 | for (t = 0; t < NEIGH_NR_TABLES; t++) { |
2725 | tbl = neigh_tables[t]; | |
2726 | ||
2727 | if (!tbl) | |
2728 | continue; | |
1da177e4 LT |
2729 | if (t < s_t || (family && tbl->family != family)) |
2730 | continue; | |
2731 | if (t > s_t) | |
2732 | memset(&cb->args[1], 0, sizeof(cb->args) - | |
2733 | sizeof(cb->args[0])); | |
84920c14 | 2734 | if (proxy) |
6f52f80e | 2735 | err = pneigh_dump_table(tbl, skb, cb, &filter); |
84920c14 | 2736 | else |
6f52f80e | 2737 | err = neigh_dump_table(tbl, skb, cb, &filter); |
4bd6683b ED |
2738 | if (err < 0) |
2739 | break; | |
1da177e4 | 2740 | } |
1da177e4 LT |
2741 | |
2742 | cb->args[0] = t; | |
2743 | return skb->len; | |
2744 | } | |
2745 | ||
82cbb5c6 RP |
2746 | static int neigh_valid_get_req(const struct nlmsghdr *nlh, |
2747 | struct neigh_table **tbl, | |
2748 | void **dst, int *dev_idx, u8 *ndm_flags, | |
2749 | struct netlink_ext_ack *extack) | |
2750 | { | |
2751 | struct nlattr *tb[NDA_MAX + 1]; | |
2752 | struct ndmsg *ndm; | |
2753 | int err, i; | |
2754 | ||
2755 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) { | |
2756 | NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request"); | |
2757 | return -EINVAL; | |
2758 | } | |
2759 | ||
2760 | ndm = nlmsg_data(nlh); | |
2761 | if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state || | |
2762 | ndm->ndm_type) { | |
2763 | NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request"); | |
2764 | return -EINVAL; | |
2765 | } | |
2766 | ||
2767 | if (ndm->ndm_flags & ~NTF_PROXY) { | |
2768 | NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request"); | |
2769 | return -EINVAL; | |
2770 | } | |
2771 | ||
8cb08174 JB |
2772 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb, |
2773 | NDA_MAX, nda_policy, extack); | |
82cbb5c6 RP |
2774 | if (err < 0) |
2775 | return err; | |
2776 | ||
2777 | *ndm_flags = ndm->ndm_flags; | |
2778 | *dev_idx = ndm->ndm_ifindex; | |
2779 | *tbl = neigh_find_table(ndm->ndm_family); | |
2780 | if (*tbl == NULL) { | |
2781 | NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request"); | |
2782 | return -EAFNOSUPPORT; | |
2783 | } | |
2784 | ||
2785 | for (i = 0; i <= NDA_MAX; ++i) { | |
2786 | if (!tb[i]) | |
2787 | continue; | |
2788 | ||
2789 | switch (i) { | |
2790 | case NDA_DST: | |
2791 | if (nla_len(tb[i]) != (int)(*tbl)->key_len) { | |
2792 | NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request"); | |
2793 | return -EINVAL; | |
2794 | } | |
2795 | *dst = nla_data(tb[i]); | |
2796 | break; | |
2797 | default: | |
2798 | NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request"); | |
2799 | return -EINVAL; | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | return 0; | |
2804 | } | |
2805 | ||
2806 | static inline size_t neigh_nlmsg_size(void) | |
2807 | { | |
2808 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
2809 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ | |
2810 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ | |
2811 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
2812 | + nla_total_size(4) /* NDA_PROBES */ | |
2813 | + nla_total_size(1); /* NDA_PROTOCOL */ | |
2814 | } | |
2815 | ||
2816 | static int neigh_get_reply(struct net *net, struct neighbour *neigh, | |
2817 | u32 pid, u32 seq) | |
2818 | { | |
2819 | struct sk_buff *skb; | |
2820 | int err = 0; | |
2821 | ||
2822 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL); | |
2823 | if (!skb) | |
2824 | return -ENOBUFS; | |
2825 | ||
2826 | err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0); | |
2827 | if (err) { | |
2828 | kfree_skb(skb); | |
2829 | goto errout; | |
2830 | } | |
2831 | ||
2832 | err = rtnl_unicast(skb, net, pid); | |
2833 | errout: | |
2834 | return err; | |
2835 | } | |
2836 | ||
2837 | static inline size_t pneigh_nlmsg_size(void) | |
2838 | { | |
2839 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
463561e6 | 2840 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
82cbb5c6 RP |
2841 | + nla_total_size(1); /* NDA_PROTOCOL */ |
2842 | } | |
2843 | ||
2844 | static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh, | |
2845 | u32 pid, u32 seq, struct neigh_table *tbl) | |
2846 | { | |
2847 | struct sk_buff *skb; | |
2848 | int err = 0; | |
2849 | ||
2850 | skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL); | |
2851 | if (!skb) | |
2852 | return -ENOBUFS; | |
2853 | ||
2854 | err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl); | |
2855 | if (err) { | |
2856 | kfree_skb(skb); | |
2857 | goto errout; | |
2858 | } | |
2859 | ||
2860 | err = rtnl_unicast(skb, net, pid); | |
2861 | errout: | |
2862 | return err; | |
2863 | } | |
2864 | ||
2865 | static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh, | |
2866 | struct netlink_ext_ack *extack) | |
2867 | { | |
2868 | struct net *net = sock_net(in_skb->sk); | |
2869 | struct net_device *dev = NULL; | |
2870 | struct neigh_table *tbl = NULL; | |
2871 | struct neighbour *neigh; | |
2872 | void *dst = NULL; | |
2873 | u8 ndm_flags = 0; | |
2874 | int dev_idx = 0; | |
2875 | int err; | |
2876 | ||
2877 | err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags, | |
2878 | extack); | |
2879 | if (err < 0) | |
2880 | return err; | |
2881 | ||
2882 | if (dev_idx) { | |
2883 | dev = __dev_get_by_index(net, dev_idx); | |
2884 | if (!dev) { | |
2885 | NL_SET_ERR_MSG(extack, "Unknown device ifindex"); | |
2886 | return -ENODEV; | |
2887 | } | |
2888 | } | |
2889 | ||
2890 | if (!dst) { | |
2891 | NL_SET_ERR_MSG(extack, "Network address not specified"); | |
2892 | return -EINVAL; | |
2893 | } | |
2894 | ||
2895 | if (ndm_flags & NTF_PROXY) { | |
2896 | struct pneigh_entry *pn; | |
2897 | ||
2898 | pn = pneigh_lookup(tbl, net, dst, dev, 0); | |
2899 | if (!pn) { | |
2900 | NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found"); | |
2901 | return -ENOENT; | |
2902 | } | |
2903 | return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid, | |
2904 | nlh->nlmsg_seq, tbl); | |
2905 | } | |
2906 | ||
2907 | if (!dev) { | |
2908 | NL_SET_ERR_MSG(extack, "No device specified"); | |
2909 | return -EINVAL; | |
2910 | } | |
2911 | ||
2912 | neigh = neigh_lookup(tbl, dst, dev); | |
2913 | if (!neigh) { | |
2914 | NL_SET_ERR_MSG(extack, "Neighbour entry not found"); | |
2915 | return -ENOENT; | |
2916 | } | |
2917 | ||
2918 | err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid, | |
2919 | nlh->nlmsg_seq); | |
2920 | ||
2921 | neigh_release(neigh); | |
2922 | ||
2923 | return err; | |
2924 | } | |
2925 | ||
1da177e4 LT |
2926 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
2927 | { | |
2928 | int chain; | |
d6bf7817 | 2929 | struct neigh_hash_table *nht; |
1da177e4 | 2930 | |
d6bf7817 ED |
2931 | rcu_read_lock_bh(); |
2932 | nht = rcu_dereference_bh(tbl->nht); | |
2933 | ||
767e97e1 | 2934 | read_lock(&tbl->lock); /* avoid resizes */ |
cd089336 | 2935 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
1da177e4 LT |
2936 | struct neighbour *n; |
2937 | ||
767e97e1 ED |
2938 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
2939 | n != NULL; | |
2940 | n = rcu_dereference_bh(n->next)) | |
1da177e4 LT |
2941 | cb(n, cookie); |
2942 | } | |
d6bf7817 ED |
2943 | read_unlock(&tbl->lock); |
2944 | rcu_read_unlock_bh(); | |
1da177e4 LT |
2945 | } |
2946 | EXPORT_SYMBOL(neigh_for_each); | |
2947 | ||
2948 | /* The tbl->lock must be held as a writer and BH disabled. */ | |
2949 | void __neigh_for_each_release(struct neigh_table *tbl, | |
2950 | int (*cb)(struct neighbour *)) | |
2951 | { | |
2952 | int chain; | |
d6bf7817 | 2953 | struct neigh_hash_table *nht; |
1da177e4 | 2954 | |
d6bf7817 ED |
2955 | nht = rcu_dereference_protected(tbl->nht, |
2956 | lockdep_is_held(&tbl->lock)); | |
cd089336 | 2957 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
767e97e1 ED |
2958 | struct neighbour *n; |
2959 | struct neighbour __rcu **np; | |
1da177e4 | 2960 | |
d6bf7817 | 2961 | np = &nht->hash_buckets[chain]; |
767e97e1 ED |
2962 | while ((n = rcu_dereference_protected(*np, |
2963 | lockdep_is_held(&tbl->lock))) != NULL) { | |
1da177e4 LT |
2964 | int release; |
2965 | ||
2966 | write_lock(&n->lock); | |
2967 | release = cb(n); | |
2968 | if (release) { | |
767e97e1 ED |
2969 | rcu_assign_pointer(*np, |
2970 | rcu_dereference_protected(n->next, | |
2971 | lockdep_is_held(&tbl->lock))); | |
58956317 | 2972 | neigh_mark_dead(n); |
1da177e4 LT |
2973 | } else |
2974 | np = &n->next; | |
2975 | write_unlock(&n->lock); | |
4f494554 TG |
2976 | if (release) |
2977 | neigh_cleanup_and_release(n); | |
1da177e4 LT |
2978 | } |
2979 | } | |
2980 | } | |
2981 | EXPORT_SYMBOL(__neigh_for_each_release); | |
2982 | ||
b79bda3d | 2983 | int neigh_xmit(int index, struct net_device *dev, |
4fd3d7d9 EB |
2984 | const void *addr, struct sk_buff *skb) |
2985 | { | |
b79bda3d EB |
2986 | int err = -EAFNOSUPPORT; |
2987 | if (likely(index < NEIGH_NR_TABLES)) { | |
4fd3d7d9 EB |
2988 | struct neigh_table *tbl; |
2989 | struct neighbour *neigh; | |
2990 | ||
b79bda3d | 2991 | tbl = neigh_tables[index]; |
4fd3d7d9 EB |
2992 | if (!tbl) |
2993 | goto out; | |
b560f03d | 2994 | rcu_read_lock_bh(); |
4b2a2bfe DA |
2995 | if (index == NEIGH_ARP_TABLE) { |
2996 | u32 key = *((u32 *)addr); | |
2997 | ||
2998 | neigh = __ipv4_neigh_lookup_noref(dev, key); | |
2999 | } else { | |
3000 | neigh = __neigh_lookup_noref(tbl, addr, dev); | |
3001 | } | |
4fd3d7d9 EB |
3002 | if (!neigh) |
3003 | neigh = __neigh_create(tbl, addr, dev, false); | |
3004 | err = PTR_ERR(neigh); | |
b560f03d DB |
3005 | if (IS_ERR(neigh)) { |
3006 | rcu_read_unlock_bh(); | |
4fd3d7d9 | 3007 | goto out_kfree_skb; |
b560f03d | 3008 | } |
4fd3d7d9 | 3009 | err = neigh->output(neigh, skb); |
b560f03d | 3010 | rcu_read_unlock_bh(); |
4fd3d7d9 | 3011 | } |
b79bda3d EB |
3012 | else if (index == NEIGH_LINK_TABLE) { |
3013 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), | |
3014 | addr, NULL, skb->len); | |
3015 | if (err < 0) | |
3016 | goto out_kfree_skb; | |
3017 | err = dev_queue_xmit(skb); | |
3018 | } | |
4fd3d7d9 EB |
3019 | out: |
3020 | return err; | |
3021 | out_kfree_skb: | |
3022 | kfree_skb(skb); | |
3023 | goto out; | |
3024 | } | |
3025 | EXPORT_SYMBOL(neigh_xmit); | |
3026 | ||
1da177e4 LT |
3027 | #ifdef CONFIG_PROC_FS |
3028 | ||
3029 | static struct neighbour *neigh_get_first(struct seq_file *seq) | |
3030 | { | |
3031 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3032 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3033 | struct neigh_hash_table *nht = state->nht; |
1da177e4 | 3034 | struct neighbour *n = NULL; |
f530eed6 | 3035 | int bucket; |
1da177e4 LT |
3036 | |
3037 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; | |
cd089336 | 3038 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
767e97e1 | 3039 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
1da177e4 LT |
3040 | |
3041 | while (n) { | |
878628fb | 3042 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3043 | goto next; |
1da177e4 LT |
3044 | if (state->neigh_sub_iter) { |
3045 | loff_t fakep = 0; | |
3046 | void *v; | |
3047 | ||
3048 | v = state->neigh_sub_iter(state, n, &fakep); | |
3049 | if (!v) | |
3050 | goto next; | |
3051 | } | |
3052 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3053 | break; | |
3054 | if (n->nud_state & ~NUD_NOARP) | |
3055 | break; | |
767e97e1 ED |
3056 | next: |
3057 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3058 | } |
3059 | ||
3060 | if (n) | |
3061 | break; | |
3062 | } | |
3063 | state->bucket = bucket; | |
3064 | ||
3065 | return n; | |
3066 | } | |
3067 | ||
3068 | static struct neighbour *neigh_get_next(struct seq_file *seq, | |
3069 | struct neighbour *n, | |
3070 | loff_t *pos) | |
3071 | { | |
3072 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3073 | struct net *net = seq_file_net(seq); |
d6bf7817 | 3074 | struct neigh_hash_table *nht = state->nht; |
1da177e4 LT |
3075 | |
3076 | if (state->neigh_sub_iter) { | |
3077 | void *v = state->neigh_sub_iter(state, n, pos); | |
3078 | if (v) | |
3079 | return n; | |
3080 | } | |
767e97e1 | 3081 | n = rcu_dereference_bh(n->next); |
1da177e4 LT |
3082 | |
3083 | while (1) { | |
3084 | while (n) { | |
878628fb | 3085 | if (!net_eq(dev_net(n->dev), net)) |
426b5303 | 3086 | goto next; |
1da177e4 LT |
3087 | if (state->neigh_sub_iter) { |
3088 | void *v = state->neigh_sub_iter(state, n, pos); | |
3089 | if (v) | |
3090 | return n; | |
3091 | goto next; | |
3092 | } | |
3093 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) | |
3094 | break; | |
3095 | ||
3096 | if (n->nud_state & ~NUD_NOARP) | |
3097 | break; | |
767e97e1 ED |
3098 | next: |
3099 | n = rcu_dereference_bh(n->next); | |
1da177e4 LT |
3100 | } |
3101 | ||
3102 | if (n) | |
3103 | break; | |
3104 | ||
cd089336 | 3105 | if (++state->bucket >= (1 << nht->hash_shift)) |
1da177e4 LT |
3106 | break; |
3107 | ||
767e97e1 | 3108 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
1da177e4 LT |
3109 | } |
3110 | ||
3111 | if (n && pos) | |
3112 | --(*pos); | |
3113 | return n; | |
3114 | } | |
3115 | ||
3116 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3117 | { | |
3118 | struct neighbour *n = neigh_get_first(seq); | |
3119 | ||
3120 | if (n) { | |
745e2031 | 3121 | --(*pos); |
1da177e4 LT |
3122 | while (*pos) { |
3123 | n = neigh_get_next(seq, n, pos); | |
3124 | if (!n) | |
3125 | break; | |
3126 | } | |
3127 | } | |
3128 | return *pos ? NULL : n; | |
3129 | } | |
3130 | ||
3131 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) | |
3132 | { | |
3133 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3134 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3135 | struct neigh_table *tbl = state->tbl; |
3136 | struct pneigh_entry *pn = NULL; | |
3137 | int bucket = state->bucket; | |
3138 | ||
3139 | state->flags |= NEIGH_SEQ_IS_PNEIGH; | |
3140 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { | |
3141 | pn = tbl->phash_buckets[bucket]; | |
878628fb | 3142 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3143 | pn = pn->next; |
1da177e4 LT |
3144 | if (pn) |
3145 | break; | |
3146 | } | |
3147 | state->bucket = bucket; | |
3148 | ||
3149 | return pn; | |
3150 | } | |
3151 | ||
3152 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, | |
3153 | struct pneigh_entry *pn, | |
3154 | loff_t *pos) | |
3155 | { | |
3156 | struct neigh_seq_state *state = seq->private; | |
1218854a | 3157 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
3158 | struct neigh_table *tbl = state->tbl; |
3159 | ||
df07a94c JBD |
3160 | do { |
3161 | pn = pn->next; | |
3162 | } while (pn && !net_eq(pneigh_net(pn), net)); | |
3163 | ||
1da177e4 LT |
3164 | while (!pn) { |
3165 | if (++state->bucket > PNEIGH_HASHMASK) | |
3166 | break; | |
3167 | pn = tbl->phash_buckets[state->bucket]; | |
878628fb | 3168 | while (pn && !net_eq(pneigh_net(pn), net)) |
426b5303 | 3169 | pn = pn->next; |
1da177e4 LT |
3170 | if (pn) |
3171 | break; | |
3172 | } | |
3173 | ||
3174 | if (pn && pos) | |
3175 | --(*pos); | |
3176 | ||
3177 | return pn; | |
3178 | } | |
3179 | ||
3180 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) | |
3181 | { | |
3182 | struct pneigh_entry *pn = pneigh_get_first(seq); | |
3183 | ||
3184 | if (pn) { | |
745e2031 | 3185 | --(*pos); |
1da177e4 LT |
3186 | while (*pos) { |
3187 | pn = pneigh_get_next(seq, pn, pos); | |
3188 | if (!pn) | |
3189 | break; | |
3190 | } | |
3191 | } | |
3192 | return *pos ? NULL : pn; | |
3193 | } | |
3194 | ||
3195 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) | |
3196 | { | |
3197 | struct neigh_seq_state *state = seq->private; | |
3198 | void *rc; | |
745e2031 | 3199 | loff_t idxpos = *pos; |
1da177e4 | 3200 | |
745e2031 | 3201 | rc = neigh_get_idx(seq, &idxpos); |
1da177e4 | 3202 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
745e2031 | 3203 | rc = pneigh_get_idx(seq, &idxpos); |
1da177e4 LT |
3204 | |
3205 | return rc; | |
3206 | } | |
3207 | ||
3208 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) | |
f3e92cb8 | 3209 | __acquires(tbl->lock) |
d6bf7817 | 3210 | __acquires(rcu_bh) |
1da177e4 LT |
3211 | { |
3212 | struct neigh_seq_state *state = seq->private; | |
1da177e4 LT |
3213 | |
3214 | state->tbl = tbl; | |
3215 | state->bucket = 0; | |
3216 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); | |
3217 | ||
d6bf7817 ED |
3218 | rcu_read_lock_bh(); |
3219 | state->nht = rcu_dereference_bh(tbl->nht); | |
f3e92cb8 | 3220 | read_lock(&tbl->lock); |
767e97e1 | 3221 | |
745e2031 | 3222 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
1da177e4 LT |
3223 | } |
3224 | EXPORT_SYMBOL(neigh_seq_start); | |
3225 | ||
3226 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3227 | { | |
3228 | struct neigh_seq_state *state; | |
3229 | void *rc; | |
3230 | ||
3231 | if (v == SEQ_START_TOKEN) { | |
bff69732 | 3232 | rc = neigh_get_first(seq); |
1da177e4 LT |
3233 | goto out; |
3234 | } | |
3235 | ||
3236 | state = seq->private; | |
3237 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { | |
3238 | rc = neigh_get_next(seq, v, NULL); | |
3239 | if (rc) | |
3240 | goto out; | |
3241 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) | |
3242 | rc = pneigh_get_first(seq); | |
3243 | } else { | |
3244 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); | |
3245 | rc = pneigh_get_next(seq, v, NULL); | |
3246 | } | |
3247 | out: | |
3248 | ++(*pos); | |
3249 | return rc; | |
3250 | } | |
3251 | EXPORT_SYMBOL(neigh_seq_next); | |
3252 | ||
3253 | void neigh_seq_stop(struct seq_file *seq, void *v) | |
f3e92cb8 | 3254 | __releases(tbl->lock) |
d6bf7817 | 3255 | __releases(rcu_bh) |
1da177e4 | 3256 | { |
f3e92cb8 ED |
3257 | struct neigh_seq_state *state = seq->private; |
3258 | struct neigh_table *tbl = state->tbl; | |
3259 | ||
3260 | read_unlock(&tbl->lock); | |
d6bf7817 | 3261 | rcu_read_unlock_bh(); |
1da177e4 LT |
3262 | } |
3263 | EXPORT_SYMBOL(neigh_seq_stop); | |
3264 | ||
3265 | /* statistics via seq_file */ | |
3266 | ||
3267 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) | |
3268 | { | |
71a5053a | 3269 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3270 | int cpu; |
3271 | ||
3272 | if (*pos == 0) | |
3273 | return SEQ_START_TOKEN; | |
4ec93edb | 3274 | |
0f23174a | 3275 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3276 | if (!cpu_possible(cpu)) |
3277 | continue; | |
3278 | *pos = cpu+1; | |
3279 | return per_cpu_ptr(tbl->stats, cpu); | |
3280 | } | |
3281 | return NULL; | |
3282 | } | |
3283 | ||
3284 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3285 | { | |
71a5053a | 3286 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3287 | int cpu; |
3288 | ||
0f23174a | 3289 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
3290 | if (!cpu_possible(cpu)) |
3291 | continue; | |
3292 | *pos = cpu+1; | |
3293 | return per_cpu_ptr(tbl->stats, cpu); | |
3294 | } | |
1e3f9f07 | 3295 | (*pos)++; |
1da177e4 LT |
3296 | return NULL; |
3297 | } | |
3298 | ||
3299 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) | |
3300 | { | |
3301 | ||
3302 | } | |
3303 | ||
3304 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) | |
3305 | { | |
71a5053a | 3306 | struct neigh_table *tbl = PDE_DATA(file_inode(seq->file)); |
1da177e4 LT |
3307 | struct neigh_statistics *st = v; |
3308 | ||
3309 | if (v == SEQ_START_TOKEN) { | |
fb811395 | 3310 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs unresolved_discards table_fulls\n"); |
1da177e4 LT |
3311 | return 0; |
3312 | } | |
3313 | ||
3314 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " | |
fb811395 | 3315 | "%08lx %08lx %08lx %08lx %08lx %08lx\n", |
1da177e4 LT |
3316 | atomic_read(&tbl->entries), |
3317 | ||
3318 | st->allocs, | |
3319 | st->destroys, | |
3320 | st->hash_grows, | |
3321 | ||
3322 | st->lookups, | |
3323 | st->hits, | |
3324 | ||
3325 | st->res_failed, | |
3326 | ||
3327 | st->rcv_probes_mcast, | |
3328 | st->rcv_probes_ucast, | |
3329 | ||
3330 | st->periodic_gc_runs, | |
9a6d276e | 3331 | st->forced_gc_runs, |
fb811395 RJ |
3332 | st->unres_discards, |
3333 | st->table_fulls | |
1da177e4 LT |
3334 | ); |
3335 | ||
3336 | return 0; | |
3337 | } | |
3338 | ||
f690808e | 3339 | static const struct seq_operations neigh_stat_seq_ops = { |
1da177e4 LT |
3340 | .start = neigh_stat_seq_start, |
3341 | .next = neigh_stat_seq_next, | |
3342 | .stop = neigh_stat_seq_stop, | |
3343 | .show = neigh_stat_seq_show, | |
3344 | }; | |
1da177e4 LT |
3345 | #endif /* CONFIG_PROC_FS */ |
3346 | ||
7b8f7a40 RP |
3347 | static void __neigh_notify(struct neighbour *n, int type, int flags, |
3348 | u32 pid) | |
1da177e4 | 3349 | { |
c346dca1 | 3350 | struct net *net = dev_net(n->dev); |
8b8aec50 | 3351 | struct sk_buff *skb; |
b8673311 | 3352 | int err = -ENOBUFS; |
1da177e4 | 3353 | |
339bf98f | 3354 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
8b8aec50 | 3355 | if (skb == NULL) |
b8673311 | 3356 | goto errout; |
1da177e4 | 3357 | |
7b8f7a40 | 3358 | err = neigh_fill_info(skb, n, pid, 0, type, flags); |
26932566 PM |
3359 | if (err < 0) { |
3360 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ | |
3361 | WARN_ON(err == -EMSGSIZE); | |
3362 | kfree_skb(skb); | |
3363 | goto errout; | |
3364 | } | |
1ce85fe4 PNA |
3365 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
3366 | return; | |
b8673311 TG |
3367 | errout: |
3368 | if (err < 0) | |
426b5303 | 3369 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
1da177e4 LT |
3370 | } |
3371 | ||
b8673311 | 3372 | void neigh_app_ns(struct neighbour *n) |
1da177e4 | 3373 | { |
7b8f7a40 | 3374 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0); |
b8673311 | 3375 | } |
0a204500 | 3376 | EXPORT_SYMBOL(neigh_app_ns); |
1da177e4 LT |
3377 | |
3378 | #ifdef CONFIG_SYSCTL | |
b93196dc | 3379 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
1da177e4 | 3380 | |
fe2c6338 JP |
3381 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
3382 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
8b5c171b ED |
3383 | { |
3384 | int size, ret; | |
fe2c6338 | 3385 | struct ctl_table tmp = *ctl; |
8b5c171b | 3386 | |
eec4844f | 3387 | tmp.extra1 = SYSCTL_ZERO; |
ce46cc64 | 3388 | tmp.extra2 = &unres_qlen_max; |
8b5c171b | 3389 | tmp.data = &size; |
ce46cc64 SW |
3390 | |
3391 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); | |
3392 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); | |
3393 | ||
8b5c171b ED |
3394 | if (write && !ret) |
3395 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); | |
3396 | return ret; | |
3397 | } | |
3398 | ||
1d4c8c29 JP |
3399 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
3400 | int family) | |
3401 | { | |
bba24896 JP |
3402 | switch (family) { |
3403 | case AF_INET: | |
1d4c8c29 | 3404 | return __in_dev_arp_parms_get_rcu(dev); |
bba24896 JP |
3405 | case AF_INET6: |
3406 | return __in6_dev_nd_parms_get_rcu(dev); | |
3407 | } | |
1d4c8c29 JP |
3408 | return NULL; |
3409 | } | |
3410 | ||
3411 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, | |
3412 | int index) | |
3413 | { | |
3414 | struct net_device *dev; | |
3415 | int family = neigh_parms_family(p); | |
3416 | ||
3417 | rcu_read_lock(); | |
3418 | for_each_netdev_rcu(net, dev) { | |
3419 | struct neigh_parms *dst_p = | |
3420 | neigh_get_dev_parms_rcu(dev, family); | |
3421 | ||
3422 | if (dst_p && !test_bit(index, dst_p->data_state)) | |
3423 | dst_p->data[index] = p->data[index]; | |
3424 | } | |
3425 | rcu_read_unlock(); | |
3426 | } | |
3427 | ||
3428 | static void neigh_proc_update(struct ctl_table *ctl, int write) | |
3429 | { | |
3430 | struct net_device *dev = ctl->extra1; | |
3431 | struct neigh_parms *p = ctl->extra2; | |
77d47afb | 3432 | struct net *net = neigh_parms_net(p); |
1d4c8c29 JP |
3433 | int index = (int *) ctl->data - p->data; |
3434 | ||
3435 | if (!write) | |
3436 | return; | |
3437 | ||
3438 | set_bit(index, p->data_state); | |
7627ae60 MH |
3439 | if (index == NEIGH_VAR_DELAY_PROBE_TIME) |
3440 | call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p); | |
1d4c8c29 JP |
3441 | if (!dev) /* NULL dev means this is default value */ |
3442 | neigh_copy_dflt_parms(net, p, index); | |
3443 | } | |
3444 | ||
1f9248e5 JP |
3445 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
3446 | void __user *buffer, | |
3447 | size_t *lenp, loff_t *ppos) | |
3448 | { | |
3449 | struct ctl_table tmp = *ctl; | |
1d4c8c29 | 3450 | int ret; |
1f9248e5 | 3451 | |
eec4844f MC |
3452 | tmp.extra1 = SYSCTL_ZERO; |
3453 | tmp.extra2 = SYSCTL_INT_MAX; | |
1f9248e5 | 3454 | |
1d4c8c29 JP |
3455 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
3456 | neigh_proc_update(ctl, write); | |
3457 | return ret; | |
1f9248e5 JP |
3458 | } |
3459 | ||
cb5b09c1 JP |
3460 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
3461 | void __user *buffer, size_t *lenp, loff_t *ppos) | |
3462 | { | |
1d4c8c29 JP |
3463 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
3464 | ||
3465 | neigh_proc_update(ctl, write); | |
3466 | return ret; | |
cb5b09c1 JP |
3467 | } |
3468 | EXPORT_SYMBOL(neigh_proc_dointvec); | |
3469 | ||
3470 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
3471 | void __user *buffer, | |
3472 | size_t *lenp, loff_t *ppos) | |
3473 | { | |
1d4c8c29 JP |
3474 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
3475 | ||
3476 | neigh_proc_update(ctl, write); | |
3477 | return ret; | |
cb5b09c1 JP |
3478 | } |
3479 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); | |
3480 | ||
3481 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, | |
3482 | void __user *buffer, | |
3483 | size_t *lenp, loff_t *ppos) | |
3484 | { | |
1d4c8c29 JP |
3485 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
3486 | ||
3487 | neigh_proc_update(ctl, write); | |
3488 | return ret; | |
cb5b09c1 JP |
3489 | } |
3490 | ||
3491 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
3492 | void __user *buffer, | |
3493 | size_t *lenp, loff_t *ppos) | |
3494 | { | |
1d4c8c29 JP |
3495 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
3496 | ||
3497 | neigh_proc_update(ctl, write); | |
3498 | return ret; | |
cb5b09c1 JP |
3499 | } |
3500 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); | |
3501 | ||
3502 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, | |
3503 | void __user *buffer, | |
3504 | size_t *lenp, loff_t *ppos) | |
3505 | { | |
1d4c8c29 JP |
3506 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
3507 | ||
3508 | neigh_proc_update(ctl, write); | |
3509 | return ret; | |
cb5b09c1 JP |
3510 | } |
3511 | ||
4bf6980d JFR |
3512 | static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write, |
3513 | void __user *buffer, | |
3514 | size_t *lenp, loff_t *ppos) | |
3515 | { | |
3516 | struct neigh_parms *p = ctl->extra2; | |
3517 | int ret; | |
3518 | ||
3519 | if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
3520 | ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); | |
3521 | else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0) | |
3522 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); | |
3523 | else | |
3524 | ret = -1; | |
3525 | ||
3526 | if (write && ret == 0) { | |
3527 | /* update reachable_time as well, otherwise, the change will | |
3528 | * only be effective after the next time neigh_periodic_work | |
3529 | * decides to recompute it | |
3530 | */ | |
3531 | p->reachable_time = | |
3532 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); | |
3533 | } | |
3534 | return ret; | |
3535 | } | |
3536 | ||
1f9248e5 JP |
3537 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
3538 | (&((struct neigh_parms *) 0)->data[index]) | |
3539 | ||
3540 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ | |
3541 | [NEIGH_VAR_ ## attr] = { \ | |
3542 | .procname = name, \ | |
3543 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ | |
3544 | .maxlen = sizeof(int), \ | |
3545 | .mode = mval, \ | |
3546 | .proc_handler = proc, \ | |
3547 | } | |
3548 | ||
3549 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ | |
3550 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) | |
3551 | ||
3552 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3553 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
1f9248e5 JP |
3554 | |
3555 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ | |
cb5b09c1 | 3556 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
1f9248e5 | 3557 | |
1f9248e5 | 3558 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ |
cb5b09c1 | 3559 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
1f9248e5 JP |
3560 | |
3561 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ | |
cb5b09c1 | 3562 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
54716e3b | 3563 | |
1da177e4 LT |
3564 | static struct neigh_sysctl_table { |
3565 | struct ctl_table_header *sysctl_header; | |
8b5c171b | 3566 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
ab32ea5d | 3567 | } neigh_sysctl_template __read_mostly = { |
1da177e4 | 3568 | .neigh_vars = { |
1f9248e5 JP |
3569 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
3570 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), | |
3571 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), | |
8da86466 | 3572 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"), |
1f9248e5 JP |
3573 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
3574 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), | |
3575 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), | |
3576 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), | |
3577 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), | |
3578 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), | |
3579 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), | |
3580 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), | |
3581 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), | |
3582 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), | |
3583 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), | |
3584 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), | |
8b5c171b | 3585 | [NEIGH_VAR_GC_INTERVAL] = { |
1da177e4 LT |
3586 | .procname = "gc_interval", |
3587 | .maxlen = sizeof(int), | |
3588 | .mode = 0644, | |
6d9f239a | 3589 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3590 | }, |
8b5c171b | 3591 | [NEIGH_VAR_GC_THRESH1] = { |
1da177e4 LT |
3592 | .procname = "gc_thresh1", |
3593 | .maxlen = sizeof(int), | |
3594 | .mode = 0644, | |
eec4844f MC |
3595 | .extra1 = SYSCTL_ZERO, |
3596 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3597 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3598 | }, |
8b5c171b | 3599 | [NEIGH_VAR_GC_THRESH2] = { |
1da177e4 LT |
3600 | .procname = "gc_thresh2", |
3601 | .maxlen = sizeof(int), | |
3602 | .mode = 0644, | |
eec4844f MC |
3603 | .extra1 = SYSCTL_ZERO, |
3604 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3605 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3606 | }, |
8b5c171b | 3607 | [NEIGH_VAR_GC_THRESH3] = { |
1da177e4 LT |
3608 | .procname = "gc_thresh3", |
3609 | .maxlen = sizeof(int), | |
3610 | .mode = 0644, | |
eec4844f MC |
3611 | .extra1 = SYSCTL_ZERO, |
3612 | .extra2 = SYSCTL_INT_MAX, | |
555445cd | 3613 | .proc_handler = proc_dointvec_minmax, |
1da177e4 | 3614 | }, |
c3bac5a7 | 3615 | {}, |
1da177e4 LT |
3616 | }, |
3617 | }; | |
3618 | ||
3619 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
73af614a | 3620 | proc_handler *handler) |
1da177e4 | 3621 | { |
1f9248e5 | 3622 | int i; |
3c607bbb | 3623 | struct neigh_sysctl_table *t; |
1f9248e5 | 3624 | const char *dev_name_source; |
8f40a1f9 | 3625 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
73af614a | 3626 | char *p_name; |
1da177e4 | 3627 | |
3c607bbb | 3628 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
1da177e4 | 3629 | if (!t) |
3c607bbb PE |
3630 | goto err; |
3631 | ||
b194c1f1 | 3632 | for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) { |
1f9248e5 | 3633 | t->neigh_vars[i].data += (long) p; |
cb5b09c1 | 3634 | t->neigh_vars[i].extra1 = dev; |
1d4c8c29 | 3635 | t->neigh_vars[i].extra2 = p; |
cb5b09c1 | 3636 | } |
1da177e4 LT |
3637 | |
3638 | if (dev) { | |
3639 | dev_name_source = dev->name; | |
d12af679 | 3640 | /* Terminate the table early */ |
8b5c171b ED |
3641 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
3642 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); | |
1da177e4 | 3643 | } else { |
9ecf07a1 | 3644 | struct neigh_table *tbl = p->tbl; |
8f40a1f9 | 3645 | dev_name_source = "default"; |
9ecf07a1 MK |
3646 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = &tbl->gc_interval; |
3647 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = &tbl->gc_thresh1; | |
3648 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = &tbl->gc_thresh2; | |
3649 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = &tbl->gc_thresh3; | |
1da177e4 LT |
3650 | } |
3651 | ||
f8572d8f | 3652 | if (handler) { |
1da177e4 | 3653 | /* RetransTime */ |
8b5c171b | 3654 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
1da177e4 | 3655 | /* ReachableTime */ |
8b5c171b | 3656 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
1da177e4 | 3657 | /* RetransTime (in milliseconds)*/ |
8b5c171b | 3658 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
1da177e4 | 3659 | /* ReachableTime (in milliseconds) */ |
8b5c171b | 3660 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
4bf6980d JFR |
3661 | } else { |
3662 | /* Those handlers will update p->reachable_time after | |
3663 | * base_reachable_time(_ms) is set to ensure the new timer starts being | |
3664 | * applied after the next neighbour update instead of waiting for | |
3665 | * neigh_periodic_work to update its value (can be multiple minutes) | |
3666 | * So any handler that replaces them should do this as well | |
3667 | */ | |
3668 | /* ReachableTime */ | |
3669 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = | |
3670 | neigh_proc_base_reachable_time; | |
3671 | /* ReachableTime (in milliseconds) */ | |
3672 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = | |
3673 | neigh_proc_base_reachable_time; | |
1da177e4 LT |
3674 | } |
3675 | ||
464dc801 EB |
3676 | /* Don't export sysctls to unprivileged users */ |
3677 | if (neigh_parms_net(p)->user_ns != &init_user_ns) | |
3678 | t->neigh_vars[0].procname = NULL; | |
3679 | ||
73af614a JP |
3680 | switch (neigh_parms_family(p)) { |
3681 | case AF_INET: | |
3682 | p_name = "ipv4"; | |
3683 | break; | |
3684 | case AF_INET6: | |
3685 | p_name = "ipv6"; | |
3686 | break; | |
3687 | default: | |
3688 | BUG(); | |
3689 | } | |
3690 | ||
8f40a1f9 EB |
3691 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
3692 | p_name, dev_name_source); | |
4ab438fc | 3693 | t->sysctl_header = |
8f40a1f9 | 3694 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
3c607bbb | 3695 | if (!t->sysctl_header) |
8f40a1f9 | 3696 | goto free; |
3c607bbb | 3697 | |
1da177e4 LT |
3698 | p->sysctl_table = t; |
3699 | return 0; | |
3700 | ||
3c607bbb | 3701 | free: |
1da177e4 | 3702 | kfree(t); |
3c607bbb PE |
3703 | err: |
3704 | return -ENOBUFS; | |
1da177e4 | 3705 | } |
0a204500 | 3706 | EXPORT_SYMBOL(neigh_sysctl_register); |
1da177e4 LT |
3707 | |
3708 | void neigh_sysctl_unregister(struct neigh_parms *p) | |
3709 | { | |
3710 | if (p->sysctl_table) { | |
3711 | struct neigh_sysctl_table *t = p->sysctl_table; | |
3712 | p->sysctl_table = NULL; | |
5dd3df10 | 3713 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
3714 | kfree(t); |
3715 | } | |
3716 | } | |
0a204500 | 3717 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
1da177e4 LT |
3718 | |
3719 | #endif /* CONFIG_SYSCTL */ | |
3720 | ||
c8822a4e TG |
3721 | static int __init neigh_init(void) |
3722 | { | |
b97bac64 FW |
3723 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0); |
3724 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0); | |
82cbb5c6 | 3725 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0); |
c8822a4e | 3726 | |
c7ac8679 | 3727 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
b97bac64 FW |
3728 | 0); |
3729 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, 0); | |
c8822a4e TG |
3730 | |
3731 | return 0; | |
3732 | } | |
3733 | ||
3734 | subsys_initcall(neigh_init); |