This source file includes following definitions.
- neigh_blackhole
- neigh_cleanup_and_release
- neigh_rand_reach_time
- neigh_mark_dead
- neigh_update_gc_list
- neigh_update_ext_learned
- neigh_del
- neigh_remove_one
- neigh_forced_gc
- neigh_add_timer
- neigh_del_timer
- pneigh_queue_purge
- neigh_flush_dev
- neigh_changeaddr
- __neigh_ifdown
- neigh_carrier_down
- neigh_ifdown
- neigh_alloc
- neigh_get_hash_rnd
- neigh_hash_alloc
- neigh_hash_free_rcu
- neigh_hash_grow
- neigh_lookup
- neigh_lookup_nodev
- ___neigh_create
- __neigh_create
- pneigh_hash
- __pneigh_lookup_1
- __pneigh_lookup
- pneigh_lookup
- pneigh_delete
- pneigh_ifdown_and_unlock
- neigh_parms_put
- neigh_destroy
- neigh_suspect
- neigh_connect
- neigh_periodic_work
- neigh_max_probes
- neigh_invalidate
- neigh_probe
- neigh_timer_handler
- __neigh_event_send
- neigh_update_hhs
- __neigh_update
- neigh_update
- __neigh_set_probe_once
- neigh_event_ns
- neigh_hh_init
- neigh_resolve_output
- neigh_connected_output
- neigh_direct_output
- neigh_proxy_process
- pneigh_enqueue
- lookup_neigh_parms
- neigh_parms_alloc
- neigh_rcu_free_parms
- neigh_parms_release
- neigh_parms_destroy
- neigh_table_init
- neigh_table_clear
- neigh_find_table
- neigh_delete
- neigh_add
- neightbl_fill_parms
- neightbl_fill_info
- neightbl_fill_param_info
- neightbl_set
- neightbl_valid_dump_info
- neightbl_dump_info
- neigh_fill_info
- pneigh_fill_info
- neigh_update_notify
- neigh_master_filtered
- neigh_ifindex_filtered
- neigh_dump_table
- pneigh_dump_table
- neigh_valid_dump_req
- neigh_dump_info
- neigh_valid_get_req
- neigh_nlmsg_size
- neigh_get_reply
- pneigh_nlmsg_size
- pneigh_get_reply
- neigh_get
- neigh_for_each
- __neigh_for_each_release
- neigh_xmit
- neigh_get_first
- neigh_get_next
- neigh_get_idx
- pneigh_get_first
- pneigh_get_next
- pneigh_get_idx
- neigh_get_idx_any
- neigh_seq_start
- neigh_seq_next
- neigh_seq_stop
- neigh_stat_seq_start
- neigh_stat_seq_next
- neigh_stat_seq_stop
- neigh_stat_seq_show
- __neigh_notify
- neigh_app_ns
- proc_unres_qlen
- neigh_get_dev_parms_rcu
- neigh_copy_dflt_parms
- neigh_proc_update
- neigh_proc_dointvec_zero_intmax
- neigh_proc_dointvec
- neigh_proc_dointvec_jiffies
- neigh_proc_dointvec_userhz_jiffies
- neigh_proc_dointvec_ms_jiffies
- neigh_proc_dointvec_unres_qlen
- neigh_proc_base_reachable_time
- neigh_sysctl_register
- neigh_sysctl_unregister
- neigh_init
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14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15
16 #include <linux/slab.h>
17 #include <linux/kmemleak.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/socket.h>
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>
28 #include <net/net_namespace.h>
29 #include <net/neighbour.h>
30 #include <net/arp.h>
31 #include <net/dst.h>
32 #include <net/sock.h>
33 #include <net/netevent.h>
34 #include <net/netlink.h>
35 #include <linux/rtnetlink.h>
36 #include <linux/random.h>
37 #include <linux/string.h>
38 #include <linux/log2.h>
39 #include <linux/inetdevice.h>
40 #include <net/addrconf.h>
41
42 #include <trace/events/neigh.h>
43
44 #define DEBUG
45 #define NEIGH_DEBUG 1
46 #define neigh_dbg(level, fmt, ...) \
47 do { \
48 if (level <= NEIGH_DEBUG) \
49 pr_debug(fmt, ##__VA_ARGS__); \
50 } while (0)
51
52 #define PNEIGH_HASHMASK 0xF
53
54 static void neigh_timer_handler(struct timer_list *t);
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);
58 static int pneigh_ifdown_and_unlock(struct neigh_table *tbl,
59 struct net_device *dev);
60
61 #ifdef CONFIG_PROC_FS
62 static const struct seq_operations neigh_stat_seq_ops;
63 #endif
64
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92
93 static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb)
94 {
95 kfree_skb(skb);
96 return -ENETDOWN;
97 }
98
99 static void neigh_cleanup_and_release(struct neighbour *neigh)
100 {
101 trace_neigh_cleanup_and_release(neigh, 0);
102 __neigh_notify(neigh, RTM_DELNEIGH, 0, 0);
103 call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
104 neigh_release(neigh);
105 }
106
107
108
109
110
111
112
113 unsigned long neigh_rand_reach_time(unsigned long base)
114 {
115 return base ? (prandom_u32() % base) + (base >> 1) : 0;
116 }
117 EXPORT_SYMBOL(neigh_rand_reach_time);
118
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
128 static void neigh_update_gc_list(struct neighbour *n)
129 {
130 bool on_gc_list, exempt_from_gc;
131
132 write_lock_bh(&n->tbl->lock);
133 write_lock(&n->lock);
134
135
136
137
138 exempt_from_gc = n->nud_state & NUD_PERMANENT ||
139 n->flags & NTF_EXT_LEARNED;
140 on_gc_list = !list_empty(&n->gc_list);
141
142 if (exempt_from_gc && on_gc_list) {
143 list_del_init(&n->gc_list);
144 atomic_dec(&n->tbl->gc_entries);
145 } else if (!exempt_from_gc && !on_gc_list) {
146
147 list_add_tail(&n->gc_list, &n->tbl->gc_list);
148 atomic_inc(&n->tbl->gc_entries);
149 }
150
151 write_unlock(&n->lock);
152 write_unlock_bh(&n->tbl->lock);
153 }
154
155 static bool neigh_update_ext_learned(struct neighbour *neigh, u32 flags,
156 int *notify)
157 {
158 bool rc = false;
159 u8 ndm_flags;
160
161 if (!(flags & NEIGH_UPDATE_F_ADMIN))
162 return rc;
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;
170 rc = true;
171 *notify = 1;
172 }
173
174 return rc;
175 }
176
177 static bool neigh_del(struct neighbour *n, struct neighbour __rcu **np,
178 struct neigh_table *tbl)
179 {
180 bool retval = false;
181
182 write_lock(&n->lock);
183 if (refcount_read(&n->refcnt) == 1) {
184 struct neighbour *neigh;
185
186 neigh = rcu_dereference_protected(n->next,
187 lockdep_is_held(&tbl->lock));
188 rcu_assign_pointer(*np, neigh);
189 neigh_mark_dead(n);
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)
215 return neigh_del(n, np, tbl);
216 np = &n->next;
217 }
218 return false;
219 }
220
221 static int neigh_forced_gc(struct neigh_table *tbl)
222 {
223 int max_clean = atomic_read(&tbl->gc_entries) - tbl->gc_thresh2;
224 unsigned long tref = jiffies - 5 * HZ;
225 struct neighbour *n, *tmp;
226 int shrunk = 0;
227
228 NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs);
229
230 write_lock_bh(&tbl->lock);
231
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);
237 if ((n->nud_state == NUD_FAILED) ||
238 time_after(tref, n->updated))
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;
246 }
247 }
248
249 tbl->last_flush = jiffies;
250
251 write_unlock_bh(&tbl->lock);
252
253 return shrunk;
254 }
255
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
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
286 static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev,
287 bool skip_perm)
288 {
289 int i;
290 struct neigh_hash_table *nht;
291
292 nht = rcu_dereference_protected(tbl->nht,
293 lockdep_is_held(&tbl->lock));
294
295 for (i = 0; i < (1 << nht->hash_shift); i++) {
296 struct neighbour *n;
297 struct neighbour __rcu **np = &nht->hash_buckets[i];
298
299 while ((n = rcu_dereference_protected(*np,
300 lockdep_is_held(&tbl->lock))) != NULL) {
301 if (dev && n->dev != dev) {
302 np = &n->next;
303 continue;
304 }
305 if (skip_perm && n->nud_state & NUD_PERMANENT) {
306 np = &n->next;
307 continue;
308 }
309 rcu_assign_pointer(*np,
310 rcu_dereference_protected(n->next,
311 lockdep_is_held(&tbl->lock)));
312 write_lock(&n->lock);
313 neigh_del_timer(n);
314 neigh_mark_dead(n);
315 if (refcount_read(&n->refcnt) != 1) {
316
317
318
319
320
321
322
323
324
325 __skb_queue_purge(&n->arp_queue);
326 n->arp_queue_len_bytes = 0;
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;
332 neigh_dbg(2, "neigh %p is stray\n", n);
333 }
334 write_unlock(&n->lock);
335 neigh_cleanup_and_release(n);
336 }
337 }
338 }
339
340 void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev)
341 {
342 write_lock_bh(&tbl->lock);
343 neigh_flush_dev(tbl, dev, false);
344 write_unlock_bh(&tbl->lock);
345 }
346 EXPORT_SYMBOL(neigh_changeaddr);
347
348 static int __neigh_ifdown(struct neigh_table *tbl, struct net_device *dev,
349 bool skip_perm)
350 {
351 write_lock_bh(&tbl->lock);
352 neigh_flush_dev(tbl, dev, skip_perm);
353 pneigh_ifdown_and_unlock(tbl, dev);
354
355 del_timer_sync(&tbl->proxy_timer);
356 pneigh_queue_purge(&tbl->proxy_queue);
357 return 0;
358 }
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 }
372 EXPORT_SYMBOL(neigh_ifdown);
373
374 static struct neighbour *neigh_alloc(struct neigh_table *tbl,
375 struct net_device *dev,
376 bool exempt_from_gc)
377 {
378 struct neighbour *n = NULL;
379 unsigned long now = jiffies;
380 int entries;
381
382 if (exempt_from_gc)
383 goto do_alloc;
384
385 entries = atomic_inc_return(&tbl->gc_entries) - 1;
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) &&
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);
394 goto out_entries;
395 }
396 }
397
398 do_alloc:
399 n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC);
400 if (!n)
401 goto out_entries;
402
403 __skb_queue_head_init(&n->arp_queue);
404 rwlock_init(&n->lock);
405 seqlock_init(&n->ha_lock);
406 n->updated = n->used = now;
407 n->nud_state = NUD_NONE;
408 n->output = neigh_blackhole;
409 seqlock_init(&n->hh.hh_lock);
410 n->parms = neigh_parms_clone(&tbl->parms);
411 timer_setup(&n->timer, neigh_timer_handler, 0);
412
413 NEIGH_CACHE_STAT_INC(tbl, allocs);
414 n->tbl = tbl;
415 refcount_set(&n->refcnt, 1);
416 n->dead = 1;
417 INIT_LIST_HEAD(&n->gc_list);
418
419 atomic_inc(&tbl->entries);
420 out:
421 return n;
422
423 out_entries:
424 if (!exempt_from_gc)
425 atomic_dec(&tbl->gc_entries);
426 goto out;
427 }
428
429 static void neigh_get_hash_rnd(u32 *x)
430 {
431 *x = get_random_u32() | 1;
432 }
433
434 static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift)
435 {
436 size_t size = (1 << shift) * sizeof(struct neighbour *);
437 struct neigh_hash_table *ret;
438 struct neighbour __rcu **buckets;
439 int i;
440
441 ret = kmalloc(sizeof(*ret), GFP_ATOMIC);
442 if (!ret)
443 return NULL;
444 if (size <= PAGE_SIZE) {
445 buckets = kzalloc(size, GFP_ATOMIC);
446 } else {
447 buckets = (struct neighbour __rcu **)
448 __get_free_pages(GFP_ATOMIC | __GFP_ZERO,
449 get_order(size));
450 kmemleak_alloc(buckets, size, 1, GFP_ATOMIC);
451 }
452 if (!buckets) {
453 kfree(ret);
454 return NULL;
455 }
456 ret->hash_buckets = buckets;
457 ret->hash_shift = shift;
458 for (i = 0; i < NEIGH_NUM_HASH_RND; i++)
459 neigh_get_hash_rnd(&ret->hash_rnd[i]);
460 return ret;
461 }
462
463 static void neigh_hash_free_rcu(struct rcu_head *head)
464 {
465 struct neigh_hash_table *nht = container_of(head,
466 struct neigh_hash_table,
467 rcu);
468 size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *);
469 struct neighbour __rcu **buckets = nht->hash_buckets;
470
471 if (size <= PAGE_SIZE) {
472 kfree(buckets);
473 } else {
474 kmemleak_free(buckets);
475 free_pages((unsigned long)buckets, get_order(size));
476 }
477 kfree(nht);
478 }
479
480 static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl,
481 unsigned long new_shift)
482 {
483 unsigned int i, hash;
484 struct neigh_hash_table *new_nht, *old_nht;
485
486 NEIGH_CACHE_STAT_INC(tbl, hash_grows);
487
488 old_nht = rcu_dereference_protected(tbl->nht,
489 lockdep_is_held(&tbl->lock));
490 new_nht = neigh_hash_alloc(new_shift);
491 if (!new_nht)
492 return old_nht;
493
494 for (i = 0; i < (1 << old_nht->hash_shift); i++) {
495 struct neighbour *n, *next;
496
497 for (n = rcu_dereference_protected(old_nht->hash_buckets[i],
498 lockdep_is_held(&tbl->lock));
499 n != NULL;
500 n = next) {
501 hash = tbl->hash(n->primary_key, n->dev,
502 new_nht->hash_rnd);
503
504 hash >>= (32 - new_nht->hash_shift);
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);
513 }
514 }
515
516 rcu_assign_pointer(tbl->nht, new_nht);
517 call_rcu(&old_nht->rcu, neigh_hash_free_rcu);
518 return new_nht;
519 }
520
521 struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
522 struct net_device *dev)
523 {
524 struct neighbour *n;
525
526 NEIGH_CACHE_STAT_INC(tbl, lookups);
527
528 rcu_read_lock_bh();
529 n = __neigh_lookup_noref(tbl, pkey, dev);
530 if (n) {
531 if (!refcount_inc_not_zero(&n->refcnt))
532 n = NULL;
533 NEIGH_CACHE_STAT_INC(tbl, hits);
534 }
535
536 rcu_read_unlock_bh();
537 return n;
538 }
539 EXPORT_SYMBOL(neigh_lookup);
540
541 struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net,
542 const void *pkey)
543 {
544 struct neighbour *n;
545 unsigned int key_len = tbl->key_len;
546 u32 hash_val;
547 struct neigh_hash_table *nht;
548
549 NEIGH_CACHE_STAT_INC(tbl, lookups);
550
551 rcu_read_lock_bh();
552 nht = rcu_dereference_bh(tbl->nht);
553 hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift);
554
555 for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
556 n != NULL;
557 n = rcu_dereference_bh(n->next)) {
558 if (!memcmp(n->primary_key, pkey, key_len) &&
559 net_eq(dev_net(n->dev), net)) {
560 if (!refcount_inc_not_zero(&n->refcnt))
561 n = NULL;
562 NEIGH_CACHE_STAT_INC(tbl, hits);
563 break;
564 }
565 }
566
567 rcu_read_unlock_bh();
568 return n;
569 }
570 EXPORT_SYMBOL(neigh_lookup_nodev);
571
572 static struct neighbour *___neigh_create(struct neigh_table *tbl,
573 const void *pkey,
574 struct net_device *dev,
575 bool exempt_from_gc, bool want_ref)
576 {
577 struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev, exempt_from_gc);
578 u32 hash_val;
579 unsigned int key_len = tbl->key_len;
580 int error;
581 struct neigh_hash_table *nht;
582
583 trace_neigh_create(tbl, dev, pkey, n, exempt_from_gc);
584
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
595 if (tbl->constructor && (error = tbl->constructor(n)) < 0) {
596 rc = ERR_PTR(error);
597 goto out_neigh_release;
598 }
599
600 if (dev->netdev_ops->ndo_neigh_construct) {
601 error = dev->netdev_ops->ndo_neigh_construct(dev, n);
602 if (error < 0) {
603 rc = ERR_PTR(error);
604 goto out_neigh_release;
605 }
606 }
607
608
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
615 n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1);
616
617 write_lock_bh(&tbl->lock);
618 nht = rcu_dereference_protected(tbl->nht,
619 lockdep_is_held(&tbl->lock));
620
621 if (atomic_read(&tbl->entries) > (1 << nht->hash_shift))
622 nht = neigh_hash_grow(tbl, nht->hash_shift + 1);
623
624 hash_val = tbl->hash(n->primary_key, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
625
626 if (n->parms->dead) {
627 rc = ERR_PTR(-EINVAL);
628 goto out_tbl_unlock;
629 }
630
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))) {
636 if (dev == n1->dev && !memcmp(n1->primary_key, n->primary_key, key_len)) {
637 if (want_ref)
638 neigh_hold(n1);
639 rc = n1;
640 goto out_tbl_unlock;
641 }
642 }
643
644 n->dead = 0;
645 if (!exempt_from_gc)
646 list_add_tail(&n->gc_list, &n->tbl->gc_list);
647
648 if (want_ref)
649 neigh_hold(n);
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);
654 write_unlock_bh(&tbl->lock);
655 neigh_dbg(2, "neigh %p is created\n", n);
656 rc = n;
657 out:
658 return rc;
659 out_tbl_unlock:
660 write_unlock_bh(&tbl->lock);
661 out_neigh_release:
662 if (!exempt_from_gc)
663 atomic_dec(&tbl->gc_entries);
664 neigh_release(n);
665 goto out;
666 }
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 }
673 EXPORT_SYMBOL(__neigh_create);
674
675 static u32 pneigh_hash(const void *pkey, unsigned int key_len)
676 {
677 u32 hash_val = *(u32 *)(pkey + key_len - 4);
678 hash_val ^= (hash_val >> 16);
679 hash_val ^= hash_val >> 8;
680 hash_val ^= hash_val >> 4;
681 hash_val &= PNEIGH_HASHMASK;
682 return hash_val;
683 }
684
685 static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n,
686 struct net *net,
687 const void *pkey,
688 unsigned int key_len,
689 struct net_device *dev)
690 {
691 while (n) {
692 if (!memcmp(n->key, pkey, key_len) &&
693 net_eq(pneigh_net(n), net) &&
694 (n->dev == dev || !n->dev))
695 return n;
696 n = n->next;
697 }
698 return NULL;
699 }
700
701 struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
702 struct net *net, const void *pkey, struct net_device *dev)
703 {
704 unsigned int key_len = tbl->key_len;
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);
709 }
710 EXPORT_SYMBOL_GPL(__pneigh_lookup);
711
712 struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl,
713 struct net *net, const void *pkey,
714 struct net_device *dev, int creat)
715 {
716 struct pneigh_entry *n;
717 unsigned int key_len = tbl->key_len;
718 u32 hash_val = pneigh_hash(pkey, key_len);
719
720 read_lock_bh(&tbl->lock);
721 n = __pneigh_lookup_1(tbl->phash_buckets[hash_val],
722 net, pkey, key_len, dev);
723 read_unlock_bh(&tbl->lock);
724
725 if (n || !creat)
726 goto out;
727
728 ASSERT_RTNL();
729
730 n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL);
731 if (!n)
732 goto out;
733
734 n->protocol = 0;
735 write_pnet(&n->net, net);
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 }
756 EXPORT_SYMBOL(pneigh_lookup);
757
758
759 int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey,
760 struct net_device *dev)
761 {
762 struct pneigh_entry *n, **np;
763 unsigned int key_len = tbl->key_len;
764 u32 hash_val = pneigh_hash(pkey, key_len);
765
766 write_lock_bh(&tbl->lock);
767 for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL;
768 np = &n->next) {
769 if (!memcmp(n->key, pkey, key_len) && n->dev == dev &&
770 net_eq(pneigh_net(n), net)) {
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
785 static int pneigh_ifdown_and_unlock(struct neigh_table *tbl,
786 struct net_device *dev)
787 {
788 struct pneigh_entry *n, **np, *freelist = NULL;
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;
796 n->next = freelist;
797 freelist = n;
798 continue;
799 }
800 np = &n->next;
801 }
802 }
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 }
813 return -ENOENT;
814 }
815
816 static void neigh_parms_destroy(struct neigh_parms *parms);
817
818 static inline void neigh_parms_put(struct neigh_parms *parms)
819 {
820 if (refcount_dec_and_test(&parms->refcnt))
821 neigh_parms_destroy(parms);
822 }
823
824
825
826
827
828 void neigh_destroy(struct neighbour *neigh)
829 {
830 struct net_device *dev = neigh->dev;
831
832 NEIGH_CACHE_STAT_INC(neigh->tbl, destroys);
833
834 if (!neigh->dead) {
835 pr_warn("Destroying alive neighbour %p\n", neigh);
836 dump_stack();
837 return;
838 }
839
840 if (neigh_del_timer(neigh))
841 pr_warn("Impossible event\n");
842
843 write_lock_bh(&neigh->lock);
844 __skb_queue_purge(&neigh->arp_queue);
845 write_unlock_bh(&neigh->lock);
846 neigh->arp_queue_len_bytes = 0;
847
848 if (dev->netdev_ops->ndo_neigh_destroy)
849 dev->netdev_ops->ndo_neigh_destroy(dev, neigh);
850
851 dev_put(dev);
852 neigh_parms_put(neigh->parms);
853
854 neigh_dbg(2, "neigh %p is destroyed\n", neigh);
855
856 atomic_dec(&neigh->tbl->entries);
857 kfree_rcu(neigh, rcu);
858 }
859 EXPORT_SYMBOL(neigh_destroy);
860
861
862
863
864
865
866 static void neigh_suspect(struct neighbour *neigh)
867 {
868 neigh_dbg(2, "neigh %p is suspected\n", neigh);
869
870 neigh->output = neigh->ops->output;
871 }
872
873
874
875
876
877
878 static void neigh_connect(struct neighbour *neigh)
879 {
880 neigh_dbg(2, "neigh %p is connected\n", neigh);
881
882 neigh->output = neigh->ops->connected_output;
883 }
884
885 static void neigh_periodic_work(struct work_struct *work)
886 {
887 struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work);
888 struct neighbour *n;
889 struct neighbour __rcu **np;
890 unsigned int i;
891 struct neigh_hash_table *nht;
892
893 NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs);
894
895 write_lock_bh(&tbl->lock);
896 nht = rcu_dereference_protected(tbl->nht,
897 lockdep_is_held(&tbl->lock));
898
899
900
901
902
903 if (time_after(jiffies, tbl->last_rand + 300 * HZ)) {
904 struct neigh_parms *p;
905 tbl->last_rand = jiffies;
906 list_for_each_entry(p, &tbl->parms_list, list)
907 p->reachable_time =
908 neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME));
909 }
910
911 if (atomic_read(&tbl->entries) < tbl->gc_thresh1)
912 goto out;
913
914 for (i = 0 ; i < (1 << nht->hash_shift); i++) {
915 np = &nht->hash_buckets[i];
916
917 while ((n = rcu_dereference_protected(*np,
918 lockdep_is_held(&tbl->lock))) != NULL) {
919 unsigned int state;
920
921 write_lock(&n->lock);
922
923 state = n->nud_state;
924 if ((state & (NUD_PERMANENT | NUD_IN_TIMER)) ||
925 (n->flags & NTF_EXT_LEARNED)) {
926 write_unlock(&n->lock);
927 goto next_elt;
928 }
929
930 if (time_before(n->used, n->confirmed))
931 n->used = n->confirmed;
932
933 if (refcount_read(&n->refcnt) == 1 &&
934 (state == NUD_FAILED ||
935 time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) {
936 *np = n->next;
937 neigh_mark_dead(n);
938 write_unlock(&n->lock);
939 neigh_cleanup_and_release(n);
940 continue;
941 }
942 write_unlock(&n->lock);
943
944 next_elt:
945 np = &n->next;
946 }
947
948
949
950
951 write_unlock_bh(&tbl->lock);
952 cond_resched();
953 write_lock_bh(&tbl->lock);
954 nht = rcu_dereference_protected(tbl->nht,
955 lockdep_is_held(&tbl->lock));
956 }
957 out:
958
959
960
961
962 queue_delayed_work(system_power_efficient_wq, &tbl->gc_work,
963 NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1);
964 write_unlock_bh(&tbl->lock);
965 }
966
967 static __inline__ int neigh_max_probes(struct neighbour *n)
968 {
969 struct neigh_parms *p = n->parms;
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));
973 }
974
975 static void neigh_invalidate(struct neighbour *neigh)
976 __releases(neigh->lock)
977 __acquires(neigh->lock)
978 {
979 struct sk_buff *skb;
980
981 NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed);
982 neigh_dbg(2, "neigh %p is failed\n", neigh);
983 neigh->updated = jiffies;
984
985
986
987
988
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 }
996 __skb_queue_purge(&neigh->arp_queue);
997 neigh->arp_queue_len_bytes = 0;
998 }
999
1000 static void neigh_probe(struct neighbour *neigh)
1001 __releases(neigh->lock)
1002 {
1003 struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue);
1004
1005 if (skb)
1006 skb = skb_clone(skb, GFP_ATOMIC);
1007 write_unlock(&neigh->lock);
1008 if (neigh->ops->solicit)
1009 neigh->ops->solicit(neigh, skb);
1010 atomic_inc(&neigh->probes);
1011 consume_skb(skb);
1012 }
1013
1014
1015
1016 static void neigh_timer_handler(struct timer_list *t)
1017 {
1018 unsigned long now, next;
1019 struct neighbour *neigh = from_timer(neigh, t, timer);
1020 unsigned int state;
1021 int notify = 0;
1022
1023 write_lock(&neigh->lock);
1024
1025 state = neigh->nud_state;
1026 now = jiffies;
1027 next = now + HZ;
1028
1029 if (!(state & NUD_IN_TIMER))
1030 goto out;
1031
1032 if (state & NUD_REACHABLE) {
1033 if (time_before_eq(now,
1034 neigh->confirmed + neigh->parms->reachable_time)) {
1035 neigh_dbg(2, "neigh %p is still alive\n", neigh);
1036 next = neigh->confirmed + neigh->parms->reachable_time;
1037 } else if (time_before_eq(now,
1038 neigh->used +
1039 NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) {
1040 neigh_dbg(2, "neigh %p is delayed\n", neigh);
1041 neigh->nud_state = NUD_DELAY;
1042 neigh->updated = jiffies;
1043 neigh_suspect(neigh);
1044 next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME);
1045 } else {
1046 neigh_dbg(2, "neigh %p is suspected\n", neigh);
1047 neigh->nud_state = NUD_STALE;
1048 neigh->updated = jiffies;
1049 neigh_suspect(neigh);
1050 notify = 1;
1051 }
1052 } else if (state & NUD_DELAY) {
1053 if (time_before_eq(now,
1054 neigh->confirmed +
1055 NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) {
1056 neigh_dbg(2, "neigh %p is now reachable\n", neigh);
1057 neigh->nud_state = NUD_REACHABLE;
1058 neigh->updated = jiffies;
1059 neigh_connect(neigh);
1060 notify = 1;
1061 next = neigh->confirmed + neigh->parms->reachable_time;
1062 } else {
1063 neigh_dbg(2, "neigh %p is probed\n", neigh);
1064 neigh->nud_state = NUD_PROBE;
1065 neigh->updated = jiffies;
1066 atomic_set(&neigh->probes, 0);
1067 notify = 1;
1068 next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME);
1069 }
1070 } else {
1071
1072 next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME);
1073 }
1074
1075 if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) &&
1076 atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) {
1077 neigh->nud_state = NUD_FAILED;
1078 notify = 1;
1079 neigh_invalidate(neigh);
1080 goto out;
1081 }
1082
1083 if (neigh->nud_state & NUD_IN_TIMER) {
1084 if (time_before(next, jiffies + HZ/2))
1085 next = jiffies + HZ/2;
1086 if (!mod_timer(&neigh->timer, next))
1087 neigh_hold(neigh);
1088 }
1089 if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) {
1090 neigh_probe(neigh);
1091 } else {
1092 out:
1093 write_unlock(&neigh->lock);
1094 }
1095
1096 if (notify)
1097 neigh_update_notify(neigh, 0);
1098
1099 trace_neigh_timer_handler(neigh, 0);
1100
1101 neigh_release(neigh);
1102 }
1103
1104 int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
1105 {
1106 int rc;
1107 bool immediate_probe = false;
1108
1109 write_lock_bh(&neigh->lock);
1110
1111 rc = 0;
1112 if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE))
1113 goto out_unlock_bh;
1114 if (neigh->dead)
1115 goto out_dead;
1116
1117 if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) {
1118 if (NEIGH_VAR(neigh->parms, MCAST_PROBES) +
1119 NEIGH_VAR(neigh->parms, APP_PROBES)) {
1120 unsigned long next, now = jiffies;
1121
1122 atomic_set(&neigh->probes,
1123 NEIGH_VAR(neigh->parms, UCAST_PROBES));
1124 neigh_del_timer(neigh);
1125 neigh->nud_state = NUD_INCOMPLETE;
1126 neigh->updated = now;
1127 next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME),
1128 HZ/2);
1129 neigh_add_timer(neigh, next);
1130 immediate_probe = true;
1131 } else {
1132 neigh->nud_state = NUD_FAILED;
1133 neigh->updated = jiffies;
1134 write_unlock_bh(&neigh->lock);
1135
1136 kfree_skb(skb);
1137 return 1;
1138 }
1139 } else if (neigh->nud_state & NUD_STALE) {
1140 neigh_dbg(2, "neigh %p is delayed\n", neigh);
1141 neigh_del_timer(neigh);
1142 neigh->nud_state = NUD_DELAY;
1143 neigh->updated = jiffies;
1144 neigh_add_timer(neigh, jiffies +
1145 NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME));
1146 }
1147
1148 if (neigh->nud_state == NUD_INCOMPLETE) {
1149 if (skb) {
1150 while (neigh->arp_queue_len_bytes + skb->truesize >
1151 NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) {
1152 struct sk_buff *buff;
1153
1154 buff = __skb_dequeue(&neigh->arp_queue);
1155 if (!buff)
1156 break;
1157 neigh->arp_queue_len_bytes -= buff->truesize;
1158 kfree_skb(buff);
1159 NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards);
1160 }
1161 skb_dst_force(skb);
1162 __skb_queue_tail(&neigh->arp_queue, skb);
1163 neigh->arp_queue_len_bytes += skb->truesize;
1164 }
1165 rc = 1;
1166 }
1167 out_unlock_bh:
1168 if (immediate_probe)
1169 neigh_probe(neigh);
1170 else
1171 write_unlock(&neigh->lock);
1172 local_bh_enable();
1173 trace_neigh_event_send_done(neigh, rc);
1174 return rc;
1175
1176 out_dead:
1177 if (neigh->nud_state & NUD_STALE)
1178 goto out_unlock_bh;
1179 write_unlock_bh(&neigh->lock);
1180 kfree_skb(skb);
1181 trace_neigh_event_send_dead(neigh, 1);
1182 return 1;
1183 }
1184 EXPORT_SYMBOL(__neigh_event_send);
1185
1186 static void neigh_update_hhs(struct neighbour *neigh)
1187 {
1188 struct hh_cache *hh;
1189 void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *)
1190 = NULL;
1191
1192 if (neigh->dev->header_ops)
1193 update = neigh->dev->header_ops->cache_update;
1194
1195 if (update) {
1196 hh = &neigh->hh;
1197 if (READ_ONCE(hh->hh_len)) {
1198 write_seqlock_bh(&hh->hh_lock);
1199 update(hh, neigh->dev, neigh->ha);
1200 write_sequnlock_bh(&hh->hh_lock);
1201 }
1202 }
1203 }
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226 static int __neigh_update(struct neighbour *neigh, const u8 *lladdr,
1227 u8 new, u32 flags, u32 nlmsg_pid,
1228 struct netlink_ext_ack *extack)
1229 {
1230 bool ext_learn_change = false;
1231 u8 old;
1232 int err;
1233 int notify = 0;
1234 struct net_device *dev;
1235 int update_isrouter = 0;
1236
1237 trace_neigh_update(neigh, lladdr, new, flags, nlmsg_pid);
1238
1239 write_lock_bh(&neigh->lock);
1240
1241 dev = neigh->dev;
1242 old = neigh->nud_state;
1243 err = -EPERM;
1244
1245 if (!(flags & NEIGH_UPDATE_F_ADMIN) &&
1246 (old & (NUD_NOARP | NUD_PERMANENT)))
1247 goto out;
1248 if (neigh->dead) {
1249 NL_SET_ERR_MSG(extack, "Neighbor entry is now dead");
1250 goto out;
1251 }
1252
1253 ext_learn_change = neigh_update_ext_learned(neigh, flags, ¬ify);
1254
1255 if (!(new & NUD_VALID)) {
1256 neigh_del_timer(neigh);
1257 if (old & NUD_CONNECTED)
1258 neigh_suspect(neigh);
1259 neigh->nud_state = new;
1260 err = 0;
1261 notify = old & NUD_VALID;
1262 if ((old & (NUD_INCOMPLETE | NUD_PROBE)) &&
1263 (new & NUD_FAILED)) {
1264 neigh_invalidate(neigh);
1265 notify = 1;
1266 }
1267 goto out;
1268 }
1269
1270
1271 if (!dev->addr_len) {
1272
1273 lladdr = neigh->ha;
1274 } else if (lladdr) {
1275
1276
1277
1278
1279
1280 if ((old & NUD_VALID) &&
1281 !memcmp(lladdr, neigh->ha, dev->addr_len))
1282 lladdr = neigh->ha;
1283 } else {
1284
1285
1286
1287 err = -EINVAL;
1288 if (!(old & NUD_VALID)) {
1289 NL_SET_ERR_MSG(extack, "No link layer address given");
1290 goto out;
1291 }
1292 lladdr = neigh->ha;
1293 }
1294
1295
1296
1297
1298 if (new & NUD_CONNECTED)
1299 neigh->confirmed = jiffies;
1300
1301
1302
1303
1304 err = 0;
1305 update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER;
1306 if (old & NUD_VALID) {
1307 if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) {
1308 update_isrouter = 0;
1309 if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) &&
1310 (old & NUD_CONNECTED)) {
1311 lladdr = neigh->ha;
1312 new = NUD_STALE;
1313 } else
1314 goto out;
1315 } else {
1316 if (lladdr == neigh->ha && new == NUD_STALE &&
1317 !(flags & NEIGH_UPDATE_F_ADMIN))
1318 new = old;
1319 }
1320 }
1321
1322
1323
1324
1325
1326 if (new != old || lladdr != neigh->ha)
1327 neigh->updated = jiffies;
1328
1329 if (new != old) {
1330 neigh_del_timer(neigh);
1331 if (new & NUD_PROBE)
1332 atomic_set(&neigh->probes, 0);
1333 if (new & NUD_IN_TIMER)
1334 neigh_add_timer(neigh, (jiffies +
1335 ((new & NUD_REACHABLE) ?
1336 neigh->parms->reachable_time :
1337 0)));
1338 neigh->nud_state = new;
1339 notify = 1;
1340 }
1341
1342 if (lladdr != neigh->ha) {
1343 write_seqlock(&neigh->ha_lock);
1344 memcpy(&neigh->ha, lladdr, dev->addr_len);
1345 write_sequnlock(&neigh->ha_lock);
1346 neigh_update_hhs(neigh);
1347 if (!(new & NUD_CONNECTED))
1348 neigh->confirmed = jiffies -
1349 (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1);
1350 notify = 1;
1351 }
1352 if (new == old)
1353 goto out;
1354 if (new & NUD_CONNECTED)
1355 neigh_connect(neigh);
1356 else
1357 neigh_suspect(neigh);
1358 if (!(old & NUD_VALID)) {
1359 struct sk_buff *skb;
1360
1361
1362
1363 while (neigh->nud_state & NUD_VALID &&
1364 (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) {
1365 struct dst_entry *dst = skb_dst(skb);
1366 struct neighbour *n2, *n1 = neigh;
1367 write_unlock_bh(&neigh->lock);
1368
1369 rcu_read_lock();
1370
1371
1372
1373
1374
1375
1376
1377
1378 n2 = NULL;
1379 if (dst) {
1380 n2 = dst_neigh_lookup_skb(dst, skb);
1381 if (n2)
1382 n1 = n2;
1383 }
1384 n1->output(n1, skb);
1385 if (n2)
1386 neigh_release(n2);
1387 rcu_read_unlock();
1388
1389 write_lock_bh(&neigh->lock);
1390 }
1391 __skb_queue_purge(&neigh->arp_queue);
1392 neigh->arp_queue_len_bytes = 0;
1393 }
1394 out:
1395 if (update_isrouter)
1396 neigh_update_is_router(neigh, flags, ¬ify);
1397 write_unlock_bh(&neigh->lock);
1398
1399 if (((new ^ old) & NUD_PERMANENT) || ext_learn_change)
1400 neigh_update_gc_list(neigh);
1401
1402 if (notify)
1403 neigh_update_notify(neigh, nlmsg_pid);
1404
1405 trace_neigh_update_done(neigh, err);
1406
1407 return err;
1408 }
1409
1410 int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
1411 u32 flags, u32 nlmsg_pid)
1412 {
1413 return __neigh_update(neigh, lladdr, new, flags, nlmsg_pid, NULL);
1414 }
1415 EXPORT_SYMBOL(neigh_update);
1416
1417
1418
1419
1420 void __neigh_set_probe_once(struct neighbour *neigh)
1421 {
1422 if (neigh->dead)
1423 return;
1424 neigh->updated = jiffies;
1425 if (!(neigh->nud_state & NUD_FAILED))
1426 return;
1427 neigh->nud_state = NUD_INCOMPLETE;
1428 atomic_set(&neigh->probes, neigh_max_probes(neigh));
1429 neigh_add_timer(neigh,
1430 jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME));
1431 }
1432 EXPORT_SYMBOL(__neigh_set_probe_once);
1433
1434 struct neighbour *neigh_event_ns(struct neigh_table *tbl,
1435 u8 *lladdr, void *saddr,
1436 struct net_device *dev)
1437 {
1438 struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev,
1439 lladdr || !dev->addr_len);
1440 if (neigh)
1441 neigh_update(neigh, lladdr, NUD_STALE,
1442 NEIGH_UPDATE_F_OVERRIDE, 0);
1443 return neigh;
1444 }
1445 EXPORT_SYMBOL(neigh_event_ns);
1446
1447
1448 static void neigh_hh_init(struct neighbour *n)
1449 {
1450 struct net_device *dev = n->dev;
1451 __be16 prot = n->tbl->protocol;
1452 struct hh_cache *hh = &n->hh;
1453
1454 write_lock_bh(&n->lock);
1455
1456
1457
1458
1459 if (!hh->hh_len)
1460 dev->header_ops->cache(n, hh, prot);
1461
1462 write_unlock_bh(&n->lock);
1463 }
1464
1465
1466
1467 int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb)
1468 {
1469 int rc = 0;
1470
1471 if (!neigh_event_send(neigh, skb)) {
1472 int err;
1473 struct net_device *dev = neigh->dev;
1474 unsigned int seq;
1475
1476 if (dev->header_ops->cache && !READ_ONCE(neigh->hh.hh_len))
1477 neigh_hh_init(neigh);
1478
1479 do {
1480 __skb_pull(skb, skb_network_offset(skb));
1481 seq = read_seqbegin(&neigh->ha_lock);
1482 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
1483 neigh->ha, NULL, skb->len);
1484 } while (read_seqretry(&neigh->ha_lock, seq));
1485
1486 if (err >= 0)
1487 rc = dev_queue_xmit(skb);
1488 else
1489 goto out_kfree_skb;
1490 }
1491 out:
1492 return rc;
1493 out_kfree_skb:
1494 rc = -EINVAL;
1495 kfree_skb(skb);
1496 goto out;
1497 }
1498 EXPORT_SYMBOL(neigh_resolve_output);
1499
1500
1501
1502 int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb)
1503 {
1504 struct net_device *dev = neigh->dev;
1505 unsigned int seq;
1506 int err;
1507
1508 do {
1509 __skb_pull(skb, skb_network_offset(skb));
1510 seq = read_seqbegin(&neigh->ha_lock);
1511 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
1512 neigh->ha, NULL, skb->len);
1513 } while (read_seqretry(&neigh->ha_lock, seq));
1514
1515 if (err >= 0)
1516 err = dev_queue_xmit(skb);
1517 else {
1518 err = -EINVAL;
1519 kfree_skb(skb);
1520 }
1521 return err;
1522 }
1523 EXPORT_SYMBOL(neigh_connected_output);
1524
1525 int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb)
1526 {
1527 return dev_queue_xmit(skb);
1528 }
1529 EXPORT_SYMBOL(neigh_direct_output);
1530
1531 static void neigh_proxy_process(struct timer_list *t)
1532 {
1533 struct neigh_table *tbl = from_timer(tbl, t, proxy_timer);
1534 long sched_next = 0;
1535 unsigned long now = jiffies;
1536 struct sk_buff *skb, *n;
1537
1538 spin_lock(&tbl->proxy_queue.lock);
1539
1540 skb_queue_walk_safe(&tbl->proxy_queue, skb, n) {
1541 long tdif = NEIGH_CB(skb)->sched_next - now;
1542
1543 if (tdif <= 0) {
1544 struct net_device *dev = skb->dev;
1545
1546 __skb_unlink(skb, &tbl->proxy_queue);
1547 if (tbl->proxy_redo && netif_running(dev)) {
1548 rcu_read_lock();
1549 tbl->proxy_redo(skb);
1550 rcu_read_unlock();
1551 } else {
1552 kfree_skb(skb);
1553 }
1554
1555 dev_put(dev);
1556 } else if (!sched_next || tdif < sched_next)
1557 sched_next = tdif;
1558 }
1559 del_timer(&tbl->proxy_timer);
1560 if (sched_next)
1561 mod_timer(&tbl->proxy_timer, jiffies + sched_next);
1562 spin_unlock(&tbl->proxy_queue.lock);
1563 }
1564
1565 void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
1566 struct sk_buff *skb)
1567 {
1568 unsigned long now = jiffies;
1569
1570 unsigned long sched_next = now + (prandom_u32() %
1571 NEIGH_VAR(p, PROXY_DELAY));
1572
1573 if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) {
1574 kfree_skb(skb);
1575 return;
1576 }
1577
1578 NEIGH_CB(skb)->sched_next = sched_next;
1579 NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED;
1580
1581 spin_lock(&tbl->proxy_queue.lock);
1582 if (del_timer(&tbl->proxy_timer)) {
1583 if (time_before(tbl->proxy_timer.expires, sched_next))
1584 sched_next = tbl->proxy_timer.expires;
1585 }
1586 skb_dst_drop(skb);
1587 dev_hold(skb->dev);
1588 __skb_queue_tail(&tbl->proxy_queue, skb);
1589 mod_timer(&tbl->proxy_timer, sched_next);
1590 spin_unlock(&tbl->proxy_queue.lock);
1591 }
1592 EXPORT_SYMBOL(pneigh_enqueue);
1593
1594 static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl,
1595 struct net *net, int ifindex)
1596 {
1597 struct neigh_parms *p;
1598
1599 list_for_each_entry(p, &tbl->parms_list, list) {
1600 if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) ||
1601 (!p->dev && !ifindex && net_eq(net, &init_net)))
1602 return p;
1603 }
1604
1605 return NULL;
1606 }
1607
1608 struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
1609 struct neigh_table *tbl)
1610 {
1611 struct neigh_parms *p;
1612 struct net *net = dev_net(dev);
1613 const struct net_device_ops *ops = dev->netdev_ops;
1614
1615 p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL);
1616 if (p) {
1617 p->tbl = tbl;
1618 refcount_set(&p->refcnt, 1);
1619 p->reachable_time =
1620 neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME));
1621 dev_hold(dev);
1622 p->dev = dev;
1623 write_pnet(&p->net, net);
1624 p->sysctl_table = NULL;
1625
1626 if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) {
1627 dev_put(dev);
1628 kfree(p);
1629 return NULL;
1630 }
1631
1632 write_lock_bh(&tbl->lock);
1633 list_add(&p->list, &tbl->parms.list);
1634 write_unlock_bh(&tbl->lock);
1635
1636 neigh_parms_data_state_cleanall(p);
1637 }
1638 return p;
1639 }
1640 EXPORT_SYMBOL(neigh_parms_alloc);
1641
1642 static void neigh_rcu_free_parms(struct rcu_head *head)
1643 {
1644 struct neigh_parms *parms =
1645 container_of(head, struct neigh_parms, rcu_head);
1646
1647 neigh_parms_put(parms);
1648 }
1649
1650 void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
1651 {
1652 if (!parms || parms == &tbl->parms)
1653 return;
1654 write_lock_bh(&tbl->lock);
1655 list_del(&parms->list);
1656 parms->dead = 1;
1657 write_unlock_bh(&tbl->lock);
1658 if (parms->dev)
1659 dev_put(parms->dev);
1660 call_rcu(&parms->rcu_head, neigh_rcu_free_parms);
1661 }
1662 EXPORT_SYMBOL(neigh_parms_release);
1663
1664 static void neigh_parms_destroy(struct neigh_parms *parms)
1665 {
1666 kfree(parms);
1667 }
1668
1669 static struct lock_class_key neigh_table_proxy_queue_class;
1670
1671 static struct neigh_table *neigh_tables[NEIGH_NR_TABLES] __read_mostly;
1672
1673 void neigh_table_init(int index, struct neigh_table *tbl)
1674 {
1675 unsigned long now = jiffies;
1676 unsigned long phsize;
1677
1678 INIT_LIST_HEAD(&tbl->parms_list);
1679 INIT_LIST_HEAD(&tbl->gc_list);
1680 list_add(&tbl->parms.list, &tbl->parms_list);
1681 write_pnet(&tbl->parms.net, &init_net);
1682 refcount_set(&tbl->parms.refcnt, 1);
1683 tbl->parms.reachable_time =
1684 neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME));
1685
1686 tbl->stats = alloc_percpu(struct neigh_statistics);
1687 if (!tbl->stats)
1688 panic("cannot create neighbour cache statistics");
1689
1690 #ifdef CONFIG_PROC_FS
1691 if (!proc_create_seq_data(tbl->id, 0, init_net.proc_net_stat,
1692 &neigh_stat_seq_ops, tbl))
1693 panic("cannot create neighbour proc dir entry");
1694 #endif
1695
1696 RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3));
1697
1698 phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *);
1699 tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL);
1700
1701 if (!tbl->nht || !tbl->phash_buckets)
1702 panic("cannot allocate neighbour cache hashes");
1703
1704 if (!tbl->entry_size)
1705 tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) +
1706 tbl->key_len, NEIGH_PRIV_ALIGN);
1707 else
1708 WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN);
1709
1710 rwlock_init(&tbl->lock);
1711 INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work);
1712 queue_delayed_work(system_power_efficient_wq, &tbl->gc_work,
1713 tbl->parms.reachable_time);
1714 timer_setup(&tbl->proxy_timer, neigh_proxy_process, 0);
1715 skb_queue_head_init_class(&tbl->proxy_queue,
1716 &neigh_table_proxy_queue_class);
1717
1718 tbl->last_flush = now;
1719 tbl->last_rand = now + tbl->parms.reachable_time * 20;
1720
1721 neigh_tables[index] = tbl;
1722 }
1723 EXPORT_SYMBOL(neigh_table_init);
1724
1725 int neigh_table_clear(int index, struct neigh_table *tbl)
1726 {
1727 neigh_tables[index] = NULL;
1728
1729 cancel_delayed_work_sync(&tbl->gc_work);
1730 del_timer_sync(&tbl->proxy_timer);
1731 pneigh_queue_purge(&tbl->proxy_queue);
1732 neigh_ifdown(tbl, NULL);
1733 if (atomic_read(&tbl->entries))
1734 pr_crit("neighbour leakage\n");
1735
1736 call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu,
1737 neigh_hash_free_rcu);
1738 tbl->nht = NULL;
1739
1740 kfree(tbl->phash_buckets);
1741 tbl->phash_buckets = NULL;
1742
1743 remove_proc_entry(tbl->id, init_net.proc_net_stat);
1744
1745 free_percpu(tbl->stats);
1746 tbl->stats = NULL;
1747
1748 return 0;
1749 }
1750 EXPORT_SYMBOL(neigh_table_clear);
1751
1752 static struct neigh_table *neigh_find_table(int family)
1753 {
1754 struct neigh_table *tbl = NULL;
1755
1756 switch (family) {
1757 case AF_INET:
1758 tbl = neigh_tables[NEIGH_ARP_TABLE];
1759 break;
1760 case AF_INET6:
1761 tbl = neigh_tables[NEIGH_ND_TABLE];
1762 break;
1763 case AF_DECnet:
1764 tbl = neigh_tables[NEIGH_DN_TABLE];
1765 break;
1766 }
1767
1768 return tbl;
1769 }
1770
1771 const struct nla_policy nda_policy[NDA_MAX+1] = {
1772 [NDA_DST] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1773 [NDA_LLADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1774 [NDA_CACHEINFO] = { .len = sizeof(struct nda_cacheinfo) },
1775 [NDA_PROBES] = { .type = NLA_U32 },
1776 [NDA_VLAN] = { .type = NLA_U16 },
1777 [NDA_PORT] = { .type = NLA_U16 },
1778 [NDA_VNI] = { .type = NLA_U32 },
1779 [NDA_IFINDEX] = { .type = NLA_U32 },
1780 [NDA_MASTER] = { .type = NLA_U32 },
1781 [NDA_PROTOCOL] = { .type = NLA_U8 },
1782 };
1783
1784 static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh,
1785 struct netlink_ext_ack *extack)
1786 {
1787 struct net *net = sock_net(skb->sk);
1788 struct ndmsg *ndm;
1789 struct nlattr *dst_attr;
1790 struct neigh_table *tbl;
1791 struct neighbour *neigh;
1792 struct net_device *dev = NULL;
1793 int err = -EINVAL;
1794
1795 ASSERT_RTNL();
1796 if (nlmsg_len(nlh) < sizeof(*ndm))
1797 goto out;
1798
1799 dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST);
1800 if (!dst_attr) {
1801 NL_SET_ERR_MSG(extack, "Network address not specified");
1802 goto out;
1803 }
1804
1805 ndm = nlmsg_data(nlh);
1806 if (ndm->ndm_ifindex) {
1807 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
1808 if (dev == NULL) {
1809 err = -ENODEV;
1810 goto out;
1811 }
1812 }
1813
1814 tbl = neigh_find_table(ndm->ndm_family);
1815 if (tbl == NULL)
1816 return -EAFNOSUPPORT;
1817
1818 if (nla_len(dst_attr) < (int)tbl->key_len) {
1819 NL_SET_ERR_MSG(extack, "Invalid network address");
1820 goto out;
1821 }
1822
1823 if (ndm->ndm_flags & NTF_PROXY) {
1824 err = pneigh_delete(tbl, net, nla_data(dst_attr), dev);
1825 goto out;
1826 }
1827
1828 if (dev == NULL)
1829 goto out;
1830
1831 neigh = neigh_lookup(tbl, nla_data(dst_attr), dev);
1832 if (neigh == NULL) {
1833 err = -ENOENT;
1834 goto out;
1835 }
1836
1837 err = __neigh_update(neigh, NULL, NUD_FAILED,
1838 NEIGH_UPDATE_F_OVERRIDE | NEIGH_UPDATE_F_ADMIN,
1839 NETLINK_CB(skb).portid, extack);
1840 write_lock_bh(&tbl->lock);
1841 neigh_release(neigh);
1842 neigh_remove_one(neigh, tbl);
1843 write_unlock_bh(&tbl->lock);
1844
1845 out:
1846 return err;
1847 }
1848
1849 static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh,
1850 struct netlink_ext_ack *extack)
1851 {
1852 int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE |
1853 NEIGH_UPDATE_F_OVERRIDE_ISROUTER;
1854 struct net *net = sock_net(skb->sk);
1855 struct ndmsg *ndm;
1856 struct nlattr *tb[NDA_MAX+1];
1857 struct neigh_table *tbl;
1858 struct net_device *dev = NULL;
1859 struct neighbour *neigh;
1860 void *dst, *lladdr;
1861 u8 protocol = 0;
1862 int err;
1863
1864 ASSERT_RTNL();
1865 err = nlmsg_parse_deprecated(nlh, sizeof(*ndm), tb, NDA_MAX,
1866 nda_policy, extack);
1867 if (err < 0)
1868 goto out;
1869
1870 err = -EINVAL;
1871 if (!tb[NDA_DST]) {
1872 NL_SET_ERR_MSG(extack, "Network address not specified");
1873 goto out;
1874 }
1875
1876 ndm = nlmsg_data(nlh);
1877 if (ndm->ndm_ifindex) {
1878 dev = __dev_get_by_index(net, ndm->ndm_ifindex);
1879 if (dev == NULL) {
1880 err = -ENODEV;
1881 goto out;
1882 }
1883
1884 if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) {
1885 NL_SET_ERR_MSG(extack, "Invalid link address");
1886 goto out;
1887 }
1888 }
1889
1890 tbl = neigh_find_table(ndm->ndm_family);
1891 if (tbl == NULL)
1892 return -EAFNOSUPPORT;
1893
1894 if (nla_len(tb[NDA_DST]) < (int)tbl->key_len) {
1895 NL_SET_ERR_MSG(extack, "Invalid network address");
1896 goto out;
1897 }
1898
1899 dst = nla_data(tb[NDA_DST]);
1900 lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL;
1901
1902 if (tb[NDA_PROTOCOL])
1903 protocol = nla_get_u8(tb[NDA_PROTOCOL]);
1904
1905 if (ndm->ndm_flags & NTF_PROXY) {
1906 struct pneigh_entry *pn;
1907
1908 err = -ENOBUFS;
1909 pn = pneigh_lookup(tbl, net, dst, dev, 1);
1910 if (pn) {
1911 pn->flags = ndm->ndm_flags;
1912 if (protocol)
1913 pn->protocol = protocol;
1914 err = 0;
1915 }
1916 goto out;
1917 }
1918
1919 if (!dev) {
1920 NL_SET_ERR_MSG(extack, "Device not specified");
1921 goto out;
1922 }
1923
1924 if (tbl->allow_add && !tbl->allow_add(dev, extack)) {
1925 err = -EINVAL;
1926 goto out;
1927 }
1928
1929 neigh = neigh_lookup(tbl, dst, dev);
1930 if (neigh == NULL) {
1931 bool exempt_from_gc;
1932
1933 if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
1934 err = -ENOENT;
1935 goto out;
1936 }
1937
1938 exempt_from_gc = ndm->ndm_state & NUD_PERMANENT ||
1939 ndm->ndm_flags & NTF_EXT_LEARNED;
1940 neigh = ___neigh_create(tbl, dst, dev, exempt_from_gc, true);
1941 if (IS_ERR(neigh)) {
1942 err = PTR_ERR(neigh);
1943 goto out;
1944 }
1945 } else {
1946 if (nlh->nlmsg_flags & NLM_F_EXCL) {
1947 err = -EEXIST;
1948 neigh_release(neigh);
1949 goto out;
1950 }
1951
1952 if (!(nlh->nlmsg_flags & NLM_F_REPLACE))
1953 flags &= ~(NEIGH_UPDATE_F_OVERRIDE |
1954 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1955 }
1956
1957 if (protocol)
1958 neigh->protocol = protocol;
1959
1960 if (ndm->ndm_flags & NTF_EXT_LEARNED)
1961 flags |= NEIGH_UPDATE_F_EXT_LEARNED;
1962
1963 if (ndm->ndm_flags & NTF_ROUTER)
1964 flags |= NEIGH_UPDATE_F_ISROUTER;
1965
1966 if (ndm->ndm_flags & NTF_USE) {
1967 neigh_event_send(neigh, NULL);
1968 err = 0;
1969 } else
1970 err = __neigh_update(neigh, lladdr, ndm->ndm_state, flags,
1971 NETLINK_CB(skb).portid, extack);
1972
1973 neigh_release(neigh);
1974
1975 out:
1976 return err;
1977 }
1978
1979 static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms)
1980 {
1981 struct nlattr *nest;
1982
1983 nest = nla_nest_start_noflag(skb, NDTA_PARMS);
1984 if (nest == NULL)
1985 return -ENOBUFS;
1986
1987 if ((parms->dev &&
1988 nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) ||
1989 nla_put_u32(skb, NDTPA_REFCNT, refcount_read(&parms->refcnt)) ||
1990 nla_put_u32(skb, NDTPA_QUEUE_LENBYTES,
1991 NEIGH_VAR(parms, QUEUE_LEN_BYTES)) ||
1992
1993 nla_put_u32(skb, NDTPA_QUEUE_LEN,
1994 NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) ||
1995 nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) ||
1996 nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) ||
1997 nla_put_u32(skb, NDTPA_UCAST_PROBES,
1998 NEIGH_VAR(parms, UCAST_PROBES)) ||
1999 nla_put_u32(skb, NDTPA_MCAST_PROBES,
2000 NEIGH_VAR(parms, MCAST_PROBES)) ||
2001 nla_put_u32(skb, NDTPA_MCAST_REPROBES,
2002 NEIGH_VAR(parms, MCAST_REPROBES)) ||
2003 nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time,
2004 NDTPA_PAD) ||
2005 nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME,
2006 NEIGH_VAR(parms, BASE_REACHABLE_TIME), NDTPA_PAD) ||
2007 nla_put_msecs(skb, NDTPA_GC_STALETIME,
2008 NEIGH_VAR(parms, GC_STALETIME), NDTPA_PAD) ||
2009 nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME,
2010 NEIGH_VAR(parms, DELAY_PROBE_TIME), NDTPA_PAD) ||
2011 nla_put_msecs(skb, NDTPA_RETRANS_TIME,
2012 NEIGH_VAR(parms, RETRANS_TIME), NDTPA_PAD) ||
2013 nla_put_msecs(skb, NDTPA_ANYCAST_DELAY,
2014 NEIGH_VAR(parms, ANYCAST_DELAY), NDTPA_PAD) ||
2015 nla_put_msecs(skb, NDTPA_PROXY_DELAY,
2016 NEIGH_VAR(parms, PROXY_DELAY), NDTPA_PAD) ||
2017 nla_put_msecs(skb, NDTPA_LOCKTIME,
2018 NEIGH_VAR(parms, LOCKTIME), NDTPA_PAD))
2019 goto nla_put_failure;
2020 return nla_nest_end(skb, nest);
2021
2022 nla_put_failure:
2023 nla_nest_cancel(skb, nest);
2024 return -EMSGSIZE;
2025 }
2026
2027 static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl,
2028 u32 pid, u32 seq, int type, int flags)
2029 {
2030 struct nlmsghdr *nlh;
2031 struct ndtmsg *ndtmsg;
2032
2033 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags);
2034 if (nlh == NULL)
2035 return -EMSGSIZE;
2036
2037 ndtmsg = nlmsg_data(nlh);
2038
2039 read_lock_bh(&tbl->lock);
2040 ndtmsg->ndtm_family = tbl->family;
2041 ndtmsg->ndtm_pad1 = 0;
2042 ndtmsg->ndtm_pad2 = 0;
2043
2044 if (nla_put_string(skb, NDTA_NAME, tbl->id) ||
2045 nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval, NDTA_PAD) ||
2046 nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) ||
2047 nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) ||
2048 nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3))
2049 goto nla_put_failure;
2050 {
2051 unsigned long now = jiffies;
2052 long flush_delta = now - tbl->last_flush;
2053 long rand_delta = now - tbl->last_rand;
2054 struct neigh_hash_table *nht;
2055 struct ndt_config ndc = {
2056 .ndtc_key_len = tbl->key_len,
2057 .ndtc_entry_size = tbl->entry_size,
2058 .ndtc_entries = atomic_read(&tbl->entries),
2059 .ndtc_last_flush = jiffies_to_msecs(flush_delta),
2060 .ndtc_last_rand = jiffies_to_msecs(rand_delta),
2061 .ndtc_proxy_qlen = tbl->proxy_queue.qlen,
2062 };
2063
2064 rcu_read_lock_bh();
2065 nht = rcu_dereference_bh(tbl->nht);
2066 ndc.ndtc_hash_rnd = nht->hash_rnd[0];
2067 ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1);
2068 rcu_read_unlock_bh();
2069
2070 if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc))
2071 goto nla_put_failure;
2072 }
2073
2074 {
2075 int cpu;
2076 struct ndt_stats ndst;
2077
2078 memset(&ndst, 0, sizeof(ndst));
2079
2080 for_each_possible_cpu(cpu) {
2081 struct neigh_statistics *st;
2082
2083 st = per_cpu_ptr(tbl->stats, cpu);
2084 ndst.ndts_allocs += st->allocs;
2085 ndst.ndts_destroys += st->destroys;
2086 ndst.ndts_hash_grows += st->hash_grows;
2087 ndst.ndts_res_failed += st->res_failed;
2088 ndst.ndts_lookups += st->lookups;
2089 ndst.ndts_hits += st->hits;
2090 ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast;
2091 ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast;
2092 ndst.ndts_periodic_gc_runs += st->periodic_gc_runs;
2093 ndst.ndts_forced_gc_runs += st->forced_gc_runs;
2094 ndst.ndts_table_fulls += st->table_fulls;
2095 }
2096
2097 if (nla_put_64bit(skb, NDTA_STATS, sizeof(ndst), &ndst,
2098 NDTA_PAD))
2099 goto nla_put_failure;
2100 }
2101
2102 BUG_ON(tbl->parms.dev);
2103 if (neightbl_fill_parms(skb, &tbl->parms) < 0)
2104 goto nla_put_failure;
2105
2106 read_unlock_bh(&tbl->lock);
2107 nlmsg_end(skb, nlh);
2108 return 0;
2109
2110 nla_put_failure:
2111 read_unlock_bh(&tbl->lock);
2112 nlmsg_cancel(skb, nlh);
2113 return -EMSGSIZE;
2114 }
2115
2116 static int neightbl_fill_param_info(struct sk_buff *skb,
2117 struct neigh_table *tbl,
2118 struct neigh_parms *parms,
2119 u32 pid, u32 seq, int type,
2120 unsigned int flags)
2121 {
2122 struct ndtmsg *ndtmsg;
2123 struct nlmsghdr *nlh;
2124
2125 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags);
2126 if (nlh == NULL)
2127 return -EMSGSIZE;
2128
2129 ndtmsg = nlmsg_data(nlh);
2130
2131 read_lock_bh(&tbl->lock);
2132 ndtmsg->ndtm_family = tbl->family;
2133 ndtmsg->ndtm_pad1 = 0;
2134 ndtmsg->ndtm_pad2 = 0;
2135
2136 if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 ||
2137 neightbl_fill_parms(skb, parms) < 0)
2138 goto errout;
2139
2140 read_unlock_bh(&tbl->lock);
2141 nlmsg_end(skb, nlh);
2142 return 0;
2143 errout:
2144 read_unlock_bh(&tbl->lock);
2145 nlmsg_cancel(skb, nlh);
2146 return -EMSGSIZE;
2147 }
2148
2149 static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = {
2150 [NDTA_NAME] = { .type = NLA_STRING },
2151 [NDTA_THRESH1] = { .type = NLA_U32 },
2152 [NDTA_THRESH2] = { .type = NLA_U32 },
2153 [NDTA_THRESH3] = { .type = NLA_U32 },
2154 [NDTA_GC_INTERVAL] = { .type = NLA_U64 },
2155 [NDTA_PARMS] = { .type = NLA_NESTED },
2156 };
2157
2158 static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = {
2159 [NDTPA_IFINDEX] = { .type = NLA_U32 },
2160 [NDTPA_QUEUE_LEN] = { .type = NLA_U32 },
2161 [NDTPA_PROXY_QLEN] = { .type = NLA_U32 },
2162 [NDTPA_APP_PROBES] = { .type = NLA_U32 },
2163 [NDTPA_UCAST_PROBES] = { .type = NLA_U32 },
2164 [NDTPA_MCAST_PROBES] = { .type = NLA_U32 },
2165 [NDTPA_MCAST_REPROBES] = { .type = NLA_U32 },
2166 [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 },
2167 [NDTPA_GC_STALETIME] = { .type = NLA_U64 },
2168 [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 },
2169 [NDTPA_RETRANS_TIME] = { .type = NLA_U64 },
2170 [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 },
2171 [NDTPA_PROXY_DELAY] = { .type = NLA_U64 },
2172 [NDTPA_LOCKTIME] = { .type = NLA_U64 },
2173 };
2174
2175 static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh,
2176 struct netlink_ext_ack *extack)
2177 {
2178 struct net *net = sock_net(skb->sk);
2179 struct neigh_table *tbl;
2180 struct ndtmsg *ndtmsg;
2181 struct nlattr *tb[NDTA_MAX+1];
2182 bool found = false;
2183 int err, tidx;
2184
2185 err = nlmsg_parse_deprecated(nlh, sizeof(*ndtmsg), tb, NDTA_MAX,
2186 nl_neightbl_policy, extack);
2187 if (err < 0)
2188 goto errout;
2189
2190 if (tb[NDTA_NAME] == NULL) {
2191 err = -EINVAL;
2192 goto errout;
2193 }
2194
2195 ndtmsg = nlmsg_data(nlh);
2196
2197 for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) {
2198 tbl = neigh_tables[tidx];
2199 if (!tbl)
2200 continue;
2201 if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family)
2202 continue;
2203 if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) {
2204 found = true;
2205 break;
2206 }
2207 }
2208
2209 if (!found)
2210 return -ENOENT;
2211
2212
2213
2214
2215
2216 write_lock_bh(&tbl->lock);
2217
2218 if (tb[NDTA_PARMS]) {
2219 struct nlattr *tbp[NDTPA_MAX+1];
2220 struct neigh_parms *p;
2221 int i, ifindex = 0;
2222
2223 err = nla_parse_nested_deprecated(tbp, NDTPA_MAX,
2224 tb[NDTA_PARMS],
2225 nl_ntbl_parm_policy, extack);
2226 if (err < 0)
2227 goto errout_tbl_lock;
2228
2229 if (tbp[NDTPA_IFINDEX])
2230 ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]);
2231
2232 p = lookup_neigh_parms(tbl, net, ifindex);
2233 if (p == NULL) {
2234 err = -ENOENT;
2235 goto errout_tbl_lock;
2236 }
2237
2238 for (i = 1; i <= NDTPA_MAX; i++) {
2239 if (tbp[i] == NULL)
2240 continue;
2241
2242 switch (i) {
2243 case NDTPA_QUEUE_LEN:
2244 NEIGH_VAR_SET(p, QUEUE_LEN_BYTES,
2245 nla_get_u32(tbp[i]) *
2246 SKB_TRUESIZE(ETH_FRAME_LEN));
2247 break;
2248 case NDTPA_QUEUE_LENBYTES:
2249 NEIGH_VAR_SET(p, QUEUE_LEN_BYTES,
2250 nla_get_u32(tbp[i]));
2251 break;
2252 case NDTPA_PROXY_QLEN:
2253 NEIGH_VAR_SET(p, PROXY_QLEN,
2254 nla_get_u32(tbp[i]));
2255 break;
2256 case NDTPA_APP_PROBES:
2257 NEIGH_VAR_SET(p, APP_PROBES,
2258 nla_get_u32(tbp[i]));
2259 break;
2260 case NDTPA_UCAST_PROBES:
2261 NEIGH_VAR_SET(p, UCAST_PROBES,
2262 nla_get_u32(tbp[i]));
2263 break;
2264 case NDTPA_MCAST_PROBES:
2265 NEIGH_VAR_SET(p, MCAST_PROBES,
2266 nla_get_u32(tbp[i]));
2267 break;
2268 case NDTPA_MCAST_REPROBES:
2269 NEIGH_VAR_SET(p, MCAST_REPROBES,
2270 nla_get_u32(tbp[i]));
2271 break;
2272 case NDTPA_BASE_REACHABLE_TIME:
2273 NEIGH_VAR_SET(p, BASE_REACHABLE_TIME,
2274 nla_get_msecs(tbp[i]));
2275
2276
2277
2278
2279 p->reachable_time =
2280 neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME));
2281 break;
2282 case NDTPA_GC_STALETIME:
2283 NEIGH_VAR_SET(p, GC_STALETIME,
2284 nla_get_msecs(tbp[i]));
2285 break;
2286 case NDTPA_DELAY_PROBE_TIME:
2287 NEIGH_VAR_SET(p, DELAY_PROBE_TIME,
2288 nla_get_msecs(tbp[i]));
2289 call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p);
2290 break;
2291 case NDTPA_RETRANS_TIME:
2292 NEIGH_VAR_SET(p, RETRANS_TIME,
2293 nla_get_msecs(tbp[i]));
2294 break;
2295 case NDTPA_ANYCAST_DELAY:
2296 NEIGH_VAR_SET(p, ANYCAST_DELAY,
2297 nla_get_msecs(tbp[i]));
2298 break;
2299 case NDTPA_PROXY_DELAY:
2300 NEIGH_VAR_SET(p, PROXY_DELAY,
2301 nla_get_msecs(tbp[i]));
2302 break;
2303 case NDTPA_LOCKTIME:
2304 NEIGH_VAR_SET(p, LOCKTIME,
2305 nla_get_msecs(tbp[i]));
2306 break;
2307 }
2308 }
2309 }
2310
2311 err = -ENOENT;
2312 if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] ||
2313 tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) &&
2314 !net_eq(net, &init_net))
2315 goto errout_tbl_lock;
2316
2317 if (tb[NDTA_THRESH1])
2318 tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]);
2319
2320 if (tb[NDTA_THRESH2])
2321 tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]);
2322
2323 if (tb[NDTA_THRESH3])
2324 tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]);
2325
2326 if (tb[NDTA_GC_INTERVAL])
2327 tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]);
2328
2329 err = 0;
2330
2331 errout_tbl_lock:
2332 write_unlock_bh(&tbl->lock);
2333 errout:
2334 return err;
2335 }
2336
2337 static int neightbl_valid_dump_info(const struct nlmsghdr *nlh,
2338 struct netlink_ext_ack *extack)
2339 {
2340 struct ndtmsg *ndtm;
2341
2342 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndtm))) {
2343 NL_SET_ERR_MSG(extack, "Invalid header for neighbor table dump request");
2344 return -EINVAL;
2345 }
2346
2347 ndtm = nlmsg_data(nlh);
2348 if (ndtm->ndtm_pad1 || ndtm->ndtm_pad2) {
2349 NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor table dump request");
2350 return -EINVAL;
2351 }
2352
2353 if (nlmsg_attrlen(nlh, sizeof(*ndtm))) {
2354 NL_SET_ERR_MSG(extack, "Invalid data after header in neighbor table dump request");
2355 return -EINVAL;
2356 }
2357
2358 return 0;
2359 }
2360
2361 static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
2362 {
2363 const struct nlmsghdr *nlh = cb->nlh;
2364 struct net *net = sock_net(skb->sk);
2365 int family, tidx, nidx = 0;
2366 int tbl_skip = cb->args[0];
2367 int neigh_skip = cb->args[1];
2368 struct neigh_table *tbl;
2369
2370 if (cb->strict_check) {
2371 int err = neightbl_valid_dump_info(nlh, cb->extack);
2372
2373 if (err < 0)
2374 return err;
2375 }
2376
2377 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2378
2379 for (tidx = 0; tidx < NEIGH_NR_TABLES; tidx++) {
2380 struct neigh_parms *p;
2381
2382 tbl = neigh_tables[tidx];
2383 if (!tbl)
2384 continue;
2385
2386 if (tidx < tbl_skip || (family && tbl->family != family))
2387 continue;
2388
2389 if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid,
2390 nlh->nlmsg_seq, RTM_NEWNEIGHTBL,
2391 NLM_F_MULTI) < 0)
2392 break;
2393
2394 nidx = 0;
2395 p = list_next_entry(&tbl->parms, list);
2396 list_for_each_entry_from(p, &tbl->parms_list, list) {
2397 if (!net_eq(neigh_parms_net(p), net))
2398 continue;
2399
2400 if (nidx < neigh_skip)
2401 goto next;
2402
2403 if (neightbl_fill_param_info(skb, tbl, p,
2404 NETLINK_CB(cb->skb).portid,
2405 nlh->nlmsg_seq,
2406 RTM_NEWNEIGHTBL,
2407 NLM_F_MULTI) < 0)
2408 goto out;
2409 next:
2410 nidx++;
2411 }
2412
2413 neigh_skip = 0;
2414 }
2415 out:
2416 cb->args[0] = tidx;
2417 cb->args[1] = nidx;
2418
2419 return skb->len;
2420 }
2421
2422 static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh,
2423 u32 pid, u32 seq, int type, unsigned int flags)
2424 {
2425 unsigned long now = jiffies;
2426 struct nda_cacheinfo ci;
2427 struct nlmsghdr *nlh;
2428 struct ndmsg *ndm;
2429
2430 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags);
2431 if (nlh == NULL)
2432 return -EMSGSIZE;
2433
2434 ndm = nlmsg_data(nlh);
2435 ndm->ndm_family = neigh->ops->family;
2436 ndm->ndm_pad1 = 0;
2437 ndm->ndm_pad2 = 0;
2438 ndm->ndm_flags = neigh->flags;
2439 ndm->ndm_type = neigh->type;
2440 ndm->ndm_ifindex = neigh->dev->ifindex;
2441
2442 if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key))
2443 goto nla_put_failure;
2444
2445 read_lock_bh(&neigh->lock);
2446 ndm->ndm_state = neigh->nud_state;
2447 if (neigh->nud_state & NUD_VALID) {
2448 char haddr[MAX_ADDR_LEN];
2449
2450 neigh_ha_snapshot(haddr, neigh, neigh->dev);
2451 if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) {
2452 read_unlock_bh(&neigh->lock);
2453 goto nla_put_failure;
2454 }
2455 }
2456
2457 ci.ndm_used = jiffies_to_clock_t(now - neigh->used);
2458 ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed);
2459 ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated);
2460 ci.ndm_refcnt = refcount_read(&neigh->refcnt) - 1;
2461 read_unlock_bh(&neigh->lock);
2462
2463 if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) ||
2464 nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
2465 goto nla_put_failure;
2466
2467 if (neigh->protocol && nla_put_u8(skb, NDA_PROTOCOL, neigh->protocol))
2468 goto nla_put_failure;
2469
2470 nlmsg_end(skb, nlh);
2471 return 0;
2472
2473 nla_put_failure:
2474 nlmsg_cancel(skb, nlh);
2475 return -EMSGSIZE;
2476 }
2477
2478 static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn,
2479 u32 pid, u32 seq, int type, unsigned int flags,
2480 struct neigh_table *tbl)
2481 {
2482 struct nlmsghdr *nlh;
2483 struct ndmsg *ndm;
2484
2485 nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags);
2486 if (nlh == NULL)
2487 return -EMSGSIZE;
2488
2489 ndm = nlmsg_data(nlh);
2490 ndm->ndm_family = tbl->family;
2491 ndm->ndm_pad1 = 0;
2492 ndm->ndm_pad2 = 0;
2493 ndm->ndm_flags = pn->flags | NTF_PROXY;
2494 ndm->ndm_type = RTN_UNICAST;
2495 ndm->ndm_ifindex = pn->dev ? pn->dev->ifindex : 0;
2496 ndm->ndm_state = NUD_NONE;
2497
2498 if (nla_put(skb, NDA_DST, tbl->key_len, pn->key))
2499 goto nla_put_failure;
2500
2501 if (pn->protocol && nla_put_u8(skb, NDA_PROTOCOL, pn->protocol))
2502 goto nla_put_failure;
2503
2504 nlmsg_end(skb, nlh);
2505 return 0;
2506
2507 nla_put_failure:
2508 nlmsg_cancel(skb, nlh);
2509 return -EMSGSIZE;
2510 }
2511
2512 static void neigh_update_notify(struct neighbour *neigh, u32 nlmsg_pid)
2513 {
2514 call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
2515 __neigh_notify(neigh, RTM_NEWNEIGH, 0, nlmsg_pid);
2516 }
2517
2518 static bool neigh_master_filtered(struct net_device *dev, int master_idx)
2519 {
2520 struct net_device *master;
2521
2522 if (!master_idx)
2523 return false;
2524
2525 master = dev ? netdev_master_upper_dev_get(dev) : NULL;
2526 if (!master || master->ifindex != master_idx)
2527 return true;
2528
2529 return false;
2530 }
2531
2532 static bool neigh_ifindex_filtered(struct net_device *dev, int filter_idx)
2533 {
2534 if (filter_idx && (!dev || dev->ifindex != filter_idx))
2535 return true;
2536
2537 return false;
2538 }
2539
2540 struct neigh_dump_filter {
2541 int master_idx;
2542 int dev_idx;
2543 };
2544
2545 static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
2546 struct netlink_callback *cb,
2547 struct neigh_dump_filter *filter)
2548 {
2549 struct net *net = sock_net(skb->sk);
2550 struct neighbour *n;
2551 int rc, h, s_h = cb->args[1];
2552 int idx, s_idx = idx = cb->args[2];
2553 struct neigh_hash_table *nht;
2554 unsigned int flags = NLM_F_MULTI;
2555
2556 if (filter->dev_idx || filter->master_idx)
2557 flags |= NLM_F_DUMP_FILTERED;
2558
2559 rcu_read_lock_bh();
2560 nht = rcu_dereference_bh(tbl->nht);
2561
2562 for (h = s_h; h < (1 << nht->hash_shift); h++) {
2563 if (h > s_h)
2564 s_idx = 0;
2565 for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0;
2566 n != NULL;
2567 n = rcu_dereference_bh(n->next)) {
2568 if (idx < s_idx || !net_eq(dev_net(n->dev), net))
2569 goto next;
2570 if (neigh_ifindex_filtered(n->dev, filter->dev_idx) ||
2571 neigh_master_filtered(n->dev, filter->master_idx))
2572 goto next;
2573 if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid,
2574 cb->nlh->nlmsg_seq,
2575 RTM_NEWNEIGH,
2576 flags) < 0) {
2577 rc = -1;
2578 goto out;
2579 }
2580 next:
2581 idx++;
2582 }
2583 }
2584 rc = skb->len;
2585 out:
2586 rcu_read_unlock_bh();
2587 cb->args[1] = h;
2588 cb->args[2] = idx;
2589 return rc;
2590 }
2591
2592 static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
2593 struct netlink_callback *cb,
2594 struct neigh_dump_filter *filter)
2595 {
2596 struct pneigh_entry *n;
2597 struct net *net = sock_net(skb->sk);
2598 int rc, h, s_h = cb->args[3];
2599 int idx, s_idx = idx = cb->args[4];
2600 unsigned int flags = NLM_F_MULTI;
2601
2602 if (filter->dev_idx || filter->master_idx)
2603 flags |= NLM_F_DUMP_FILTERED;
2604
2605 read_lock_bh(&tbl->lock);
2606
2607 for (h = s_h; h <= PNEIGH_HASHMASK; h++) {
2608 if (h > s_h)
2609 s_idx = 0;
2610 for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) {
2611 if (idx < s_idx || pneigh_net(n) != net)
2612 goto next;
2613 if (neigh_ifindex_filtered(n->dev, filter->dev_idx) ||
2614 neigh_master_filtered(n->dev, filter->master_idx))
2615 goto next;
2616 if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid,
2617 cb->nlh->nlmsg_seq,
2618 RTM_NEWNEIGH, flags, tbl) < 0) {
2619 read_unlock_bh(&tbl->lock);
2620 rc = -1;
2621 goto out;
2622 }
2623 next:
2624 idx++;
2625 }
2626 }
2627
2628 read_unlock_bh(&tbl->lock);
2629 rc = skb->len;
2630 out:
2631 cb->args[3] = h;
2632 cb->args[4] = idx;
2633 return rc;
2634
2635 }
2636
2637 static int neigh_valid_dump_req(const struct nlmsghdr *nlh,
2638 bool strict_check,
2639 struct neigh_dump_filter *filter,
2640 struct netlink_ext_ack *extack)
2641 {
2642 struct nlattr *tb[NDA_MAX + 1];
2643 int err, i;
2644
2645 if (strict_check) {
2646 struct ndmsg *ndm;
2647
2648 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
2649 NL_SET_ERR_MSG(extack, "Invalid header for neighbor dump request");
2650 return -EINVAL;
2651 }
2652
2653 ndm = nlmsg_data(nlh);
2654 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_ifindex ||
2655 ndm->ndm_state || ndm->ndm_type) {
2656 NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor dump request");
2657 return -EINVAL;
2658 }
2659
2660 if (ndm->ndm_flags & ~NTF_PROXY) {
2661 NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor dump request");
2662 return -EINVAL;
2663 }
2664
2665 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg),
2666 tb, NDA_MAX, nda_policy,
2667 extack);
2668 } else {
2669 err = nlmsg_parse_deprecated(nlh, sizeof(struct ndmsg), tb,
2670 NDA_MAX, nda_policy, extack);
2671 }
2672 if (err < 0)
2673 return err;
2674
2675 for (i = 0; i <= NDA_MAX; ++i) {
2676 if (!tb[i])
2677 continue;
2678
2679
2680 switch (i) {
2681 case NDA_IFINDEX:
2682 filter->dev_idx = nla_get_u32(tb[i]);
2683 break;
2684 case NDA_MASTER:
2685 filter->master_idx = nla_get_u32(tb[i]);
2686 break;
2687 default:
2688 if (strict_check) {
2689 NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor dump request");
2690 return -EINVAL;
2691 }
2692 }
2693 }
2694
2695 return 0;
2696 }
2697
2698 static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
2699 {
2700 const struct nlmsghdr *nlh = cb->nlh;
2701 struct neigh_dump_filter filter = {};
2702 struct neigh_table *tbl;
2703 int t, family, s_t;
2704 int proxy = 0;
2705 int err;
2706
2707 family = ((struct rtgenmsg *)nlmsg_data(nlh))->rtgen_family;
2708
2709
2710
2711
2712 if (nlmsg_len(nlh) >= sizeof(struct ndmsg) &&
2713 ((struct ndmsg *)nlmsg_data(nlh))->ndm_flags == NTF_PROXY)
2714 proxy = 1;
2715
2716 err = neigh_valid_dump_req(nlh, cb->strict_check, &filter, cb->extack);
2717 if (err < 0 && cb->strict_check)
2718 return err;
2719
2720 s_t = cb->args[0];
2721
2722 for (t = 0; t < NEIGH_NR_TABLES; t++) {
2723 tbl = neigh_tables[t];
2724
2725 if (!tbl)
2726 continue;
2727 if (t < s_t || (family && tbl->family != family))
2728 continue;
2729 if (t > s_t)
2730 memset(&cb->args[1], 0, sizeof(cb->args) -
2731 sizeof(cb->args[0]));
2732 if (proxy)
2733 err = pneigh_dump_table(tbl, skb, cb, &filter);
2734 else
2735 err = neigh_dump_table(tbl, skb, cb, &filter);
2736 if (err < 0)
2737 break;
2738 }
2739
2740 cb->args[0] = t;
2741 return skb->len;
2742 }
2743
2744 static int neigh_valid_get_req(const struct nlmsghdr *nlh,
2745 struct neigh_table **tbl,
2746 void **dst, int *dev_idx, u8 *ndm_flags,
2747 struct netlink_ext_ack *extack)
2748 {
2749 struct nlattr *tb[NDA_MAX + 1];
2750 struct ndmsg *ndm;
2751 int err, i;
2752
2753 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ndm))) {
2754 NL_SET_ERR_MSG(extack, "Invalid header for neighbor get request");
2755 return -EINVAL;
2756 }
2757
2758 ndm = nlmsg_data(nlh);
2759 if (ndm->ndm_pad1 || ndm->ndm_pad2 || ndm->ndm_state ||
2760 ndm->ndm_type) {
2761 NL_SET_ERR_MSG(extack, "Invalid values in header for neighbor get request");
2762 return -EINVAL;
2763 }
2764
2765 if (ndm->ndm_flags & ~NTF_PROXY) {
2766 NL_SET_ERR_MSG(extack, "Invalid flags in header for neighbor get request");
2767 return -EINVAL;
2768 }
2769
2770 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct ndmsg), tb,
2771 NDA_MAX, nda_policy, extack);
2772 if (err < 0)
2773 return err;
2774
2775 *ndm_flags = ndm->ndm_flags;
2776 *dev_idx = ndm->ndm_ifindex;
2777 *tbl = neigh_find_table(ndm->ndm_family);
2778 if (*tbl == NULL) {
2779 NL_SET_ERR_MSG(extack, "Unsupported family in header for neighbor get request");
2780 return -EAFNOSUPPORT;
2781 }
2782
2783 for (i = 0; i <= NDA_MAX; ++i) {
2784 if (!tb[i])
2785 continue;
2786
2787 switch (i) {
2788 case NDA_DST:
2789 if (nla_len(tb[i]) != (int)(*tbl)->key_len) {
2790 NL_SET_ERR_MSG(extack, "Invalid network address in neighbor get request");
2791 return -EINVAL;
2792 }
2793 *dst = nla_data(tb[i]);
2794 break;
2795 default:
2796 NL_SET_ERR_MSG(extack, "Unsupported attribute in neighbor get request");
2797 return -EINVAL;
2798 }
2799 }
2800
2801 return 0;
2802 }
2803
2804 static inline size_t neigh_nlmsg_size(void)
2805 {
2806 return NLMSG_ALIGN(sizeof(struct ndmsg))
2807 + nla_total_size(MAX_ADDR_LEN)
2808 + nla_total_size(MAX_ADDR_LEN)
2809 + nla_total_size(sizeof(struct nda_cacheinfo))
2810 + nla_total_size(4)
2811 + nla_total_size(1);
2812 }
2813
2814 static int neigh_get_reply(struct net *net, struct neighbour *neigh,
2815 u32 pid, u32 seq)
2816 {
2817 struct sk_buff *skb;
2818 int err = 0;
2819
2820 skb = nlmsg_new(neigh_nlmsg_size(), GFP_KERNEL);
2821 if (!skb)
2822 return -ENOBUFS;
2823
2824 err = neigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0);
2825 if (err) {
2826 kfree_skb(skb);
2827 goto errout;
2828 }
2829
2830 err = rtnl_unicast(skb, net, pid);
2831 errout:
2832 return err;
2833 }
2834
2835 static inline size_t pneigh_nlmsg_size(void)
2836 {
2837 return NLMSG_ALIGN(sizeof(struct ndmsg))
2838 + nla_total_size(MAX_ADDR_LEN)
2839 + nla_total_size(1);
2840 }
2841
2842 static int pneigh_get_reply(struct net *net, struct pneigh_entry *neigh,
2843 u32 pid, u32 seq, struct neigh_table *tbl)
2844 {
2845 struct sk_buff *skb;
2846 int err = 0;
2847
2848 skb = nlmsg_new(pneigh_nlmsg_size(), GFP_KERNEL);
2849 if (!skb)
2850 return -ENOBUFS;
2851
2852 err = pneigh_fill_info(skb, neigh, pid, seq, RTM_NEWNEIGH, 0, tbl);
2853 if (err) {
2854 kfree_skb(skb);
2855 goto errout;
2856 }
2857
2858 err = rtnl_unicast(skb, net, pid);
2859 errout:
2860 return err;
2861 }
2862
2863 static int neigh_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
2864 struct netlink_ext_ack *extack)
2865 {
2866 struct net *net = sock_net(in_skb->sk);
2867 struct net_device *dev = NULL;
2868 struct neigh_table *tbl = NULL;
2869 struct neighbour *neigh;
2870 void *dst = NULL;
2871 u8 ndm_flags = 0;
2872 int dev_idx = 0;
2873 int err;
2874
2875 err = neigh_valid_get_req(nlh, &tbl, &dst, &dev_idx, &ndm_flags,
2876 extack);
2877 if (err < 0)
2878 return err;
2879
2880 if (dev_idx) {
2881 dev = __dev_get_by_index(net, dev_idx);
2882 if (!dev) {
2883 NL_SET_ERR_MSG(extack, "Unknown device ifindex");
2884 return -ENODEV;
2885 }
2886 }
2887
2888 if (!dst) {
2889 NL_SET_ERR_MSG(extack, "Network address not specified");
2890 return -EINVAL;
2891 }
2892
2893 if (ndm_flags & NTF_PROXY) {
2894 struct pneigh_entry *pn;
2895
2896 pn = pneigh_lookup(tbl, net, dst, dev, 0);
2897 if (!pn) {
2898 NL_SET_ERR_MSG(extack, "Proxy neighbour entry not found");
2899 return -ENOENT;
2900 }
2901 return pneigh_get_reply(net, pn, NETLINK_CB(in_skb).portid,
2902 nlh->nlmsg_seq, tbl);
2903 }
2904
2905 if (!dev) {
2906 NL_SET_ERR_MSG(extack, "No device specified");
2907 return -EINVAL;
2908 }
2909
2910 neigh = neigh_lookup(tbl, dst, dev);
2911 if (!neigh) {
2912 NL_SET_ERR_MSG(extack, "Neighbour entry not found");
2913 return -ENOENT;
2914 }
2915
2916 err = neigh_get_reply(net, neigh, NETLINK_CB(in_skb).portid,
2917 nlh->nlmsg_seq);
2918
2919 neigh_release(neigh);
2920
2921 return err;
2922 }
2923
2924 void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie)
2925 {
2926 int chain;
2927 struct neigh_hash_table *nht;
2928
2929 rcu_read_lock_bh();
2930 nht = rcu_dereference_bh(tbl->nht);
2931
2932 read_lock(&tbl->lock);
2933 for (chain = 0; chain < (1 << nht->hash_shift); chain++) {
2934 struct neighbour *n;
2935
2936 for (n = rcu_dereference_bh(nht->hash_buckets[chain]);
2937 n != NULL;
2938 n = rcu_dereference_bh(n->next))
2939 cb(n, cookie);
2940 }
2941 read_unlock(&tbl->lock);
2942 rcu_read_unlock_bh();
2943 }
2944 EXPORT_SYMBOL(neigh_for_each);
2945
2946
2947 void __neigh_for_each_release(struct neigh_table *tbl,
2948 int (*cb)(struct neighbour *))
2949 {
2950 int chain;
2951 struct neigh_hash_table *nht;
2952
2953 nht = rcu_dereference_protected(tbl->nht,
2954 lockdep_is_held(&tbl->lock));
2955 for (chain = 0; chain < (1 << nht->hash_shift); chain++) {
2956 struct neighbour *n;
2957 struct neighbour __rcu **np;
2958
2959 np = &nht->hash_buckets[chain];
2960 while ((n = rcu_dereference_protected(*np,
2961 lockdep_is_held(&tbl->lock))) != NULL) {
2962 int release;
2963
2964 write_lock(&n->lock);
2965 release = cb(n);
2966 if (release) {
2967 rcu_assign_pointer(*np,
2968 rcu_dereference_protected(n->next,
2969 lockdep_is_held(&tbl->lock)));
2970 neigh_mark_dead(n);
2971 } else
2972 np = &n->next;
2973 write_unlock(&n->lock);
2974 if (release)
2975 neigh_cleanup_and_release(n);
2976 }
2977 }
2978 }
2979 EXPORT_SYMBOL(__neigh_for_each_release);
2980
2981 int neigh_xmit(int index, struct net_device *dev,
2982 const void *addr, struct sk_buff *skb)
2983 {
2984 int err = -EAFNOSUPPORT;
2985 if (likely(index < NEIGH_NR_TABLES)) {
2986 struct neigh_table *tbl;
2987 struct neighbour *neigh;
2988
2989 tbl = neigh_tables[index];
2990 if (!tbl)
2991 goto out;
2992 rcu_read_lock_bh();
2993 if (index == NEIGH_ARP_TABLE) {
2994 u32 key = *((u32 *)addr);
2995
2996 neigh = __ipv4_neigh_lookup_noref(dev, key);
2997 } else {
2998 neigh = __neigh_lookup_noref(tbl, addr, dev);
2999 }
3000 if (!neigh)
3001 neigh = __neigh_create(tbl, addr, dev, false);
3002 err = PTR_ERR(neigh);
3003 if (IS_ERR(neigh)) {
3004 rcu_read_unlock_bh();
3005 goto out_kfree_skb;
3006 }
3007 err = neigh->output(neigh, skb);
3008 rcu_read_unlock_bh();
3009 }
3010 else if (index == NEIGH_LINK_TABLE) {
3011 err = dev_hard_header(skb, dev, ntohs(skb->protocol),
3012 addr, NULL, skb->len);
3013 if (err < 0)
3014 goto out_kfree_skb;
3015 err = dev_queue_xmit(skb);
3016 }
3017 out:
3018 return err;
3019 out_kfree_skb:
3020 kfree_skb(skb);
3021 goto out;
3022 }
3023 EXPORT_SYMBOL(neigh_xmit);
3024
3025 #ifdef CONFIG_PROC_FS
3026
3027 static struct neighbour *neigh_get_first(struct seq_file *seq)
3028 {
3029 struct neigh_seq_state *state = seq->private;
3030 struct net *net = seq_file_net(seq);
3031 struct neigh_hash_table *nht = state->nht;
3032 struct neighbour *n = NULL;
3033 int bucket;
3034
3035 state->flags &= ~NEIGH_SEQ_IS_PNEIGH;
3036 for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) {
3037 n = rcu_dereference_bh(nht->hash_buckets[bucket]);
3038
3039 while (n) {
3040 if (!net_eq(dev_net(n->dev), net))
3041 goto next;
3042 if (state->neigh_sub_iter) {
3043 loff_t fakep = 0;
3044 void *v;
3045
3046 v = state->neigh_sub_iter(state, n, &fakep);
3047 if (!v)
3048 goto next;
3049 }
3050 if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
3051 break;
3052 if (n->nud_state & ~NUD_NOARP)
3053 break;
3054 next:
3055 n = rcu_dereference_bh(n->next);
3056 }
3057
3058 if (n)
3059 break;
3060 }
3061 state->bucket = bucket;
3062
3063 return n;
3064 }
3065
3066 static struct neighbour *neigh_get_next(struct seq_file *seq,
3067 struct neighbour *n,
3068 loff_t *pos)
3069 {
3070 struct neigh_seq_state *state = seq->private;
3071 struct net *net = seq_file_net(seq);
3072 struct neigh_hash_table *nht = state->nht;
3073
3074 if (state->neigh_sub_iter) {
3075 void *v = state->neigh_sub_iter(state, n, pos);
3076 if (v)
3077 return n;
3078 }
3079 n = rcu_dereference_bh(n->next);
3080
3081 while (1) {
3082 while (n) {
3083 if (!net_eq(dev_net(n->dev), net))
3084 goto next;
3085 if (state->neigh_sub_iter) {
3086 void *v = state->neigh_sub_iter(state, n, pos);
3087 if (v)
3088 return n;
3089 goto next;
3090 }
3091 if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
3092 break;
3093
3094 if (n->nud_state & ~NUD_NOARP)
3095 break;
3096 next:
3097 n = rcu_dereference_bh(n->next);
3098 }
3099
3100 if (n)
3101 break;
3102
3103 if (++state->bucket >= (1 << nht->hash_shift))
3104 break;
3105
3106 n = rcu_dereference_bh(nht->hash_buckets[state->bucket]);
3107 }
3108
3109 if (n && pos)
3110 --(*pos);
3111 return n;
3112 }
3113
3114 static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos)
3115 {
3116 struct neighbour *n = neigh_get_first(seq);
3117
3118 if (n) {
3119 --(*pos);
3120 while (*pos) {
3121 n = neigh_get_next(seq, n, pos);
3122 if (!n)
3123 break;
3124 }
3125 }
3126 return *pos ? NULL : n;
3127 }
3128
3129 static struct pneigh_entry *pneigh_get_first(struct seq_file *seq)
3130 {
3131 struct neigh_seq_state *state = seq->private;
3132 struct net *net = seq_file_net(seq);
3133 struct neigh_table *tbl = state->tbl;
3134 struct pneigh_entry *pn = NULL;
3135 int bucket = state->bucket;
3136
3137 state->flags |= NEIGH_SEQ_IS_PNEIGH;
3138 for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) {
3139 pn = tbl->phash_buckets[bucket];
3140 while (pn && !net_eq(pneigh_net(pn), net))
3141 pn = pn->next;
3142 if (pn)
3143 break;
3144 }
3145 state->bucket = bucket;
3146
3147 return pn;
3148 }
3149
3150 static struct pneigh_entry *pneigh_get_next(struct seq_file *seq,
3151 struct pneigh_entry *pn,
3152 loff_t *pos)
3153 {
3154 struct neigh_seq_state *state = seq->private;
3155 struct net *net = seq_file_net(seq);
3156 struct neigh_table *tbl = state->tbl;
3157
3158 do {
3159 pn = pn->next;
3160 } while (pn && !net_eq(pneigh_net(pn), net));
3161
3162 while (!pn) {
3163 if (++state->bucket > PNEIGH_HASHMASK)
3164 break;
3165 pn = tbl->phash_buckets[state->bucket];
3166 while (pn && !net_eq(pneigh_net(pn), net))
3167 pn = pn->next;
3168 if (pn)
3169 break;
3170 }
3171
3172 if (pn && pos)
3173 --(*pos);
3174
3175 return pn;
3176 }
3177
3178 static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos)
3179 {
3180 struct pneigh_entry *pn = pneigh_get_first(seq);
3181
3182 if (pn) {
3183 --(*pos);
3184 while (*pos) {
3185 pn = pneigh_get_next(seq, pn, pos);
3186 if (!pn)
3187 break;
3188 }
3189 }
3190 return *pos ? NULL : pn;
3191 }
3192
3193 static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos)
3194 {
3195 struct neigh_seq_state *state = seq->private;
3196 void *rc;
3197 loff_t idxpos = *pos;
3198
3199 rc = neigh_get_idx(seq, &idxpos);
3200 if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY))
3201 rc = pneigh_get_idx(seq, &idxpos);
3202
3203 return rc;
3204 }
3205
3206 void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags)
3207 __acquires(tbl->lock)
3208 __acquires(rcu_bh)
3209 {
3210 struct neigh_seq_state *state = seq->private;
3211
3212 state->tbl = tbl;
3213 state->bucket = 0;
3214 state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH);
3215
3216 rcu_read_lock_bh();
3217 state->nht = rcu_dereference_bh(tbl->nht);
3218 read_lock(&tbl->lock);
3219
3220 return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN;
3221 }
3222 EXPORT_SYMBOL(neigh_seq_start);
3223
3224 void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3225 {
3226 struct neigh_seq_state *state;
3227 void *rc;
3228
3229 if (v == SEQ_START_TOKEN) {
3230 rc = neigh_get_first(seq);
3231 goto out;
3232 }
3233
3234 state = seq->private;
3235 if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) {
3236 rc = neigh_get_next(seq, v, NULL);
3237 if (rc)
3238 goto out;
3239 if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY))
3240 rc = pneigh_get_first(seq);
3241 } else {
3242 BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY);
3243 rc = pneigh_get_next(seq, v, NULL);
3244 }
3245 out:
3246 ++(*pos);
3247 return rc;
3248 }
3249 EXPORT_SYMBOL(neigh_seq_next);
3250
3251 void neigh_seq_stop(struct seq_file *seq, void *v)
3252 __releases(tbl->lock)
3253 __releases(rcu_bh)
3254 {
3255 struct neigh_seq_state *state = seq->private;
3256 struct neigh_table *tbl = state->tbl;
3257
3258 read_unlock(&tbl->lock);
3259 rcu_read_unlock_bh();
3260 }
3261 EXPORT_SYMBOL(neigh_seq_stop);
3262
3263
3264
3265 static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos)
3266 {
3267 struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
3268 int cpu;
3269
3270 if (*pos == 0)
3271 return SEQ_START_TOKEN;
3272
3273 for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
3274 if (!cpu_possible(cpu))
3275 continue;
3276 *pos = cpu+1;
3277 return per_cpu_ptr(tbl->stats, cpu);
3278 }
3279 return NULL;
3280 }
3281
3282 static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3283 {
3284 struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
3285 int cpu;
3286
3287 for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
3288 if (!cpu_possible(cpu))
3289 continue;
3290 *pos = cpu+1;
3291 return per_cpu_ptr(tbl->stats, cpu);
3292 }
3293 return NULL;
3294 }
3295
3296 static void neigh_stat_seq_stop(struct seq_file *seq, void *v)
3297 {
3298
3299 }
3300
3301 static int neigh_stat_seq_show(struct seq_file *seq, void *v)
3302 {
3303 struct neigh_table *tbl = PDE_DATA(file_inode(seq->file));
3304 struct neigh_statistics *st = v;
3305
3306 if (v == SEQ_START_TOKEN) {
3307 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");
3308 return 0;
3309 }
3310
3311 seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx "
3312 "%08lx %08lx %08lx %08lx %08lx %08lx\n",
3313 atomic_read(&tbl->entries),
3314
3315 st->allocs,
3316 st->destroys,
3317 st->hash_grows,
3318
3319 st->lookups,
3320 st->hits,
3321
3322 st->res_failed,
3323
3324 st->rcv_probes_mcast,
3325 st->rcv_probes_ucast,
3326
3327 st->periodic_gc_runs,
3328 st->forced_gc_runs,
3329 st->unres_discards,
3330 st->table_fulls
3331 );
3332
3333 return 0;
3334 }
3335
3336 static const struct seq_operations neigh_stat_seq_ops = {
3337 .start = neigh_stat_seq_start,
3338 .next = neigh_stat_seq_next,
3339 .stop = neigh_stat_seq_stop,
3340 .show = neigh_stat_seq_show,
3341 };
3342 #endif
3343
3344 static void __neigh_notify(struct neighbour *n, int type, int flags,
3345 u32 pid)
3346 {
3347 struct net *net = dev_net(n->dev);
3348 struct sk_buff *skb;
3349 int err = -ENOBUFS;
3350
3351 skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC);
3352 if (skb == NULL)
3353 goto errout;
3354
3355 err = neigh_fill_info(skb, n, pid, 0, type, flags);
3356 if (err < 0) {
3357
3358 WARN_ON(err == -EMSGSIZE);
3359 kfree_skb(skb);
3360 goto errout;
3361 }
3362 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
3363 return;
3364 errout:
3365 if (err < 0)
3366 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
3367 }
3368
3369 void neigh_app_ns(struct neighbour *n)
3370 {
3371 __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST, 0);
3372 }
3373 EXPORT_SYMBOL(neigh_app_ns);
3374
3375 #ifdef CONFIG_SYSCTL
3376 static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN);
3377
3378 static int proc_unres_qlen(struct ctl_table *ctl, int write,
3379 void __user *buffer, size_t *lenp, loff_t *ppos)
3380 {
3381 int size, ret;
3382 struct ctl_table tmp = *ctl;
3383
3384 tmp.extra1 = SYSCTL_ZERO;
3385 tmp.extra2 = &unres_qlen_max;
3386 tmp.data = &size;
3387
3388 size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN);
3389 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3390
3391 if (write && !ret)
3392 *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN);
3393 return ret;
3394 }
3395
3396 static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev,
3397 int family)
3398 {
3399 switch (family) {
3400 case AF_INET:
3401 return __in_dev_arp_parms_get_rcu(dev);
3402 case AF_INET6:
3403 return __in6_dev_nd_parms_get_rcu(dev);
3404 }
3405 return NULL;
3406 }
3407
3408 static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p,
3409 int index)
3410 {
3411 struct net_device *dev;
3412 int family = neigh_parms_family(p);
3413
3414 rcu_read_lock();
3415 for_each_netdev_rcu(net, dev) {
3416 struct neigh_parms *dst_p =
3417 neigh_get_dev_parms_rcu(dev, family);
3418
3419 if (dst_p && !test_bit(index, dst_p->data_state))
3420 dst_p->data[index] = p->data[index];
3421 }
3422 rcu_read_unlock();
3423 }
3424
3425 static void neigh_proc_update(struct ctl_table *ctl, int write)
3426 {
3427 struct net_device *dev = ctl->extra1;
3428 struct neigh_parms *p = ctl->extra2;
3429 struct net *net = neigh_parms_net(p);
3430 int index = (int *) ctl->data - p->data;
3431
3432 if (!write)
3433 return;
3434
3435 set_bit(index, p->data_state);
3436 if (index == NEIGH_VAR_DELAY_PROBE_TIME)
3437 call_netevent_notifiers(NETEVENT_DELAY_PROBE_TIME_UPDATE, p);
3438 if (!dev)
3439 neigh_copy_dflt_parms(net, p, index);
3440 }
3441
3442 static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write,
3443 void __user *buffer,
3444 size_t *lenp, loff_t *ppos)
3445 {
3446 struct ctl_table tmp = *ctl;
3447 int ret;
3448
3449 tmp.extra1 = SYSCTL_ZERO;
3450 tmp.extra2 = SYSCTL_INT_MAX;
3451
3452 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3453 neigh_proc_update(ctl, write);
3454 return ret;
3455 }
3456
3457 int neigh_proc_dointvec(struct ctl_table *ctl, int write,
3458 void __user *buffer, size_t *lenp, loff_t *ppos)
3459 {
3460 int ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
3461
3462 neigh_proc_update(ctl, write);
3463 return ret;
3464 }
3465 EXPORT_SYMBOL(neigh_proc_dointvec);
3466
3467 int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write,
3468 void __user *buffer,
3469 size_t *lenp, loff_t *ppos)
3470 {
3471 int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos);
3472
3473 neigh_proc_update(ctl, write);
3474 return ret;
3475 }
3476 EXPORT_SYMBOL(neigh_proc_dointvec_jiffies);
3477
3478 static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write,
3479 void __user *buffer,
3480 size_t *lenp, loff_t *ppos)
3481 {
3482 int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos);
3483
3484 neigh_proc_update(ctl, write);
3485 return ret;
3486 }
3487
3488 int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write,
3489 void __user *buffer,
3490 size_t *lenp, loff_t *ppos)
3491 {
3492 int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos);
3493
3494 neigh_proc_update(ctl, write);
3495 return ret;
3496 }
3497 EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies);
3498
3499 static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write,
3500 void __user *buffer,
3501 size_t *lenp, loff_t *ppos)
3502 {
3503 int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos);
3504
3505 neigh_proc_update(ctl, write);
3506 return ret;
3507 }
3508
3509 static int neigh_proc_base_reachable_time(struct ctl_table *ctl, int write,
3510 void __user *buffer,
3511 size_t *lenp, loff_t *ppos)
3512 {
3513 struct neigh_parms *p = ctl->extra2;
3514 int ret;
3515
3516 if (strcmp(ctl->procname, "base_reachable_time") == 0)
3517 ret = neigh_proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos);
3518 else if (strcmp(ctl->procname, "base_reachable_time_ms") == 0)
3519 ret = neigh_proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos);
3520 else
3521 ret = -1;
3522
3523 if (write && ret == 0) {
3524
3525
3526
3527
3528 p->reachable_time =
3529 neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME));
3530 }
3531 return ret;
3532 }
3533
3534 #define NEIGH_PARMS_DATA_OFFSET(index) \
3535 (&((struct neigh_parms *) 0)->data[index])
3536
3537 #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \
3538 [NEIGH_VAR_ ## attr] = { \
3539 .procname = name, \
3540 .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \
3541 .maxlen = sizeof(int), \
3542 .mode = mval, \
3543 .proc_handler = proc, \
3544 }
3545
3546 #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \
3547 NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax)
3548
3549 #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \
3550 NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies)
3551
3552 #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \
3553 NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies)
3554
3555 #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \
3556 NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies)
3557
3558 #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \
3559 NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies)
3560
3561 #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \
3562 NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen)
3563
3564 static struct neigh_sysctl_table {
3565 struct ctl_table_header *sysctl_header;
3566 struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1];
3567 } neigh_sysctl_template __read_mostly = {
3568 .neigh_vars = {
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"),
3572 NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_REPROBES, "mcast_resolicit"),
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"),
3585 [NEIGH_VAR_GC_INTERVAL] = {
3586 .procname = "gc_interval",
3587 .maxlen = sizeof(int),
3588 .mode = 0644,
3589 .proc_handler = proc_dointvec_jiffies,
3590 },
3591 [NEIGH_VAR_GC_THRESH1] = {
3592 .procname = "gc_thresh1",
3593 .maxlen = sizeof(int),
3594 .mode = 0644,
3595 .extra1 = SYSCTL_ZERO,
3596 .extra2 = SYSCTL_INT_MAX,
3597 .proc_handler = proc_dointvec_minmax,
3598 },
3599 [NEIGH_VAR_GC_THRESH2] = {
3600 .procname = "gc_thresh2",
3601 .maxlen = sizeof(int),
3602 .mode = 0644,
3603 .extra1 = SYSCTL_ZERO,
3604 .extra2 = SYSCTL_INT_MAX,
3605 .proc_handler = proc_dointvec_minmax,
3606 },
3607 [NEIGH_VAR_GC_THRESH3] = {
3608 .procname = "gc_thresh3",
3609 .maxlen = sizeof(int),
3610 .mode = 0644,
3611 .extra1 = SYSCTL_ZERO,
3612 .extra2 = SYSCTL_INT_MAX,
3613 .proc_handler = proc_dointvec_minmax,
3614 },
3615 {},
3616 },
3617 };
3618
3619 int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
3620 proc_handler *handler)
3621 {
3622 int i;
3623 struct neigh_sysctl_table *t;
3624 const char *dev_name_source;
3625 char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ];
3626 char *p_name;
3627
3628 t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL);
3629 if (!t)
3630 goto err;
3631
3632 for (i = 0; i < NEIGH_VAR_GC_INTERVAL; i++) {
3633 t->neigh_vars[i].data += (long) p;
3634 t->neigh_vars[i].extra1 = dev;
3635 t->neigh_vars[i].extra2 = p;
3636 }
3637
3638 if (dev) {
3639 dev_name_source = dev->name;
3640
3641 memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0,
3642 sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL]));
3643 } else {
3644 struct neigh_table *tbl = p->tbl;
3645 dev_name_source = "default";
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;
3650 }
3651
3652 if (handler) {
3653
3654 t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler;
3655
3656 t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler;
3657
3658 t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler;
3659
3660 t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler;
3661 } else {
3662
3663
3664
3665
3666
3667
3668
3669 t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler =
3670 neigh_proc_base_reachable_time;
3671
3672 t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler =
3673 neigh_proc_base_reachable_time;
3674 }
3675
3676
3677 if (neigh_parms_net(p)->user_ns != &init_user_ns)
3678 t->neigh_vars[0].procname = NULL;
3679
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
3691 snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s",
3692 p_name, dev_name_source);
3693 t->sysctl_header =
3694 register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars);
3695 if (!t->sysctl_header)
3696 goto free;
3697
3698 p->sysctl_table = t;
3699 return 0;
3700
3701 free:
3702 kfree(t);
3703 err:
3704 return -ENOBUFS;
3705 }
3706 EXPORT_SYMBOL(neigh_sysctl_register);
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;
3713 unregister_net_sysctl_table(t->sysctl_header);
3714 kfree(t);
3715 }
3716 }
3717 EXPORT_SYMBOL(neigh_sysctl_unregister);
3718
3719 #endif
3720
3721 static int __init neigh_init(void)
3722 {
3723 rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, 0);
3724 rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, 0);
3725 rtnl_register(PF_UNSPEC, RTM_GETNEIGH, neigh_get, neigh_dump_info, 0);
3726
3727 rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info,
3728 0);
3729 rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, 0);
3730
3731 return 0;
3732 }
3733
3734 subsys_initcall(neigh_init);