1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_NEIGHBOUR_H
3 #define _NET_NEIGHBOUR_H
4
5 #include <linux/neighbour.h>
6
7 /*
8 * Generic neighbour manipulation
9 *
10 * Authors:
11 * Pedro Roque <roque@di.fc.ul.pt>
12 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
13 *
14 * Changes:
15 *
16 * Harald Welte: <laforge@gnumonks.org>
17 * - Add neighbour cache statistics like rtstat
18 */
19
20 #include <linux/atomic.h>
21 #include <linux/refcount.h>
22 #include <linux/netdevice.h>
23 #include <linux/skbuff.h>
24 #include <linux/rcupdate.h>
25 #include <linux/seq_file.h>
26 #include <linux/bitmap.h>
27
28 #include <linux/err.h>
29 #include <linux/sysctl.h>
30 #include <linux/workqueue.h>
31 #include <net/rtnetlink.h>
32 #include <net/neighbour_tables.h>
33
34 /*
35 * NUD stands for "neighbor unreachability detection"
36 */
37
38 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
39 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
40 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
41
42 struct neighbour;
43
44 enum {
45 NEIGH_VAR_MCAST_PROBES,
46 NEIGH_VAR_UCAST_PROBES,
47 NEIGH_VAR_APP_PROBES,
48 NEIGH_VAR_MCAST_REPROBES,
49 NEIGH_VAR_RETRANS_TIME,
50 NEIGH_VAR_BASE_REACHABLE_TIME,
51 NEIGH_VAR_DELAY_PROBE_TIME,
52 NEIGH_VAR_INTERVAL_PROBE_TIME_MS,
53 NEIGH_VAR_GC_STALETIME,
54 NEIGH_VAR_QUEUE_LEN_BYTES,
55 NEIGH_VAR_PROXY_QLEN,
56 NEIGH_VAR_ANYCAST_DELAY,
57 NEIGH_VAR_PROXY_DELAY,
58 NEIGH_VAR_LOCKTIME,
59 #define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1)
60 /* Following are used as a second way to access one of the above */
61 NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */
62 NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */
63 NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */
64 /* Following are used by "default" only */
65 NEIGH_VAR_GC_INTERVAL,
66 NEIGH_VAR_GC_THRESH1,
67 NEIGH_VAR_GC_THRESH2,
68 NEIGH_VAR_GC_THRESH3,
69 NEIGH_VAR_MAX
70 };
71
72 struct neigh_parms {
73 possible_net_t net;
74 struct net_device *dev;
75 netdevice_tracker dev_tracker;
76 struct list_head list;
77 int (*neigh_setup)(struct neighbour *);
78 struct neigh_table *tbl;
79
80 void *sysctl_table;
81
82 int dead;
83 refcount_t refcnt;
84 struct rcu_head rcu_head;
85
86 int reachable_time;
87 u32 qlen;
88 int data[NEIGH_VAR_DATA_MAX];
89 DECLARE_BITMAP(data_state, NEIGH_VAR_DATA_MAX);
90 };
91
neigh_var_set(struct neigh_parms * p,int index,int val)92 static inline void neigh_var_set(struct neigh_parms *p, int index, int val)
93 {
94 set_bit(index, p->data_state);
95 WRITE_ONCE(p->data[index], val);
96 }
97
98 #define __NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr])
99 #define NEIGH_VAR(p, attr) READ_ONCE(__NEIGH_VAR(p, attr))
100 #define NEIGH_VAR_PTR(p, attr) (&(__NEIGH_VAR(p, attr)))
101
102 /* In ndo_neigh_setup, NEIGH_VAR_INIT should be used.
103 * In other cases, NEIGH_VAR_SET should be used.
104 */
105 #define NEIGH_VAR_INIT(p, attr, val) (__NEIGH_VAR(p, attr) = val)
106 #define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val)
107
neigh_parms_data_state_setall(struct neigh_parms * p)108 static inline void neigh_parms_data_state_setall(struct neigh_parms *p)
109 {
110 bitmap_fill(p->data_state, NEIGH_VAR_DATA_MAX);
111 }
112
neigh_parms_data_state_cleanall(struct neigh_parms * p)113 static inline void neigh_parms_data_state_cleanall(struct neigh_parms *p)
114 {
115 bitmap_zero(p->data_state, NEIGH_VAR_DATA_MAX);
116 }
117
118 struct neigh_statistics {
119 unsigned long allocs; /* number of allocated neighs */
120 unsigned long destroys; /* number of destroyed neighs */
121 unsigned long hash_grows; /* number of hash resizes */
122
123 unsigned long res_failed; /* number of failed resolutions */
124
125 unsigned long lookups; /* number of lookups */
126 unsigned long hits; /* number of hits (among lookups) */
127
128 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
129 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
130
131 unsigned long periodic_gc_runs; /* number of periodic GC runs */
132 unsigned long forced_gc_runs; /* number of forced GC runs */
133
134 unsigned long unres_discards; /* number of unresolved drops */
135 unsigned long table_fulls; /* times even gc couldn't help */
136 };
137
138 #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
139
140 struct neighbour {
141 struct hlist_node hash;
142 struct hlist_node dev_list;
143 struct neigh_table *tbl;
144 struct neigh_parms *parms;
145 unsigned long confirmed;
146 unsigned long updated;
147 rwlock_t lock;
148 refcount_t refcnt;
149 unsigned int arp_queue_len_bytes;
150 struct sk_buff_head arp_queue;
151 struct timer_list timer;
152 unsigned long used;
153 atomic_t probes;
154 u8 nud_state;
155 u8 type;
156 u8 dead;
157 u8 protocol;
158 u32 flags;
159 seqlock_t ha_lock;
160 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))] __aligned(8);
161 struct hh_cache hh;
162 int (*output)(struct neighbour *, struct sk_buff *);
163 const struct neigh_ops *ops;
164 struct list_head gc_list;
165 struct list_head managed_list;
166 struct rcu_head rcu;
167 struct net_device *dev;
168 netdevice_tracker dev_tracker;
169 u8 primary_key[];
170 } __randomize_layout;
171
172 struct neigh_ops {
173 int family;
174 void (*solicit)(struct neighbour *, struct sk_buff *);
175 void (*error_report)(struct neighbour *, struct sk_buff *);
176 int (*output)(struct neighbour *, struct sk_buff *);
177 int (*connected_output)(struct neighbour *, struct sk_buff *);
178 };
179
180 struct pneigh_entry {
181 struct pneigh_entry __rcu *next;
182 possible_net_t net;
183 struct net_device *dev;
184 netdevice_tracker dev_tracker;
185 union {
186 struct list_head free_node;
187 struct rcu_head rcu;
188 };
189 u32 flags;
190 u8 protocol;
191 bool permanent;
192 u32 key[];
193 };
194
195 /*
196 * neighbour table manipulation
197 */
198
199 #define NEIGH_NUM_HASH_RND 4
200
201 struct neigh_hash_table {
202 struct hlist_head *hash_heads;
203 unsigned int hash_shift;
204 __u32 hash_rnd[NEIGH_NUM_HASH_RND];
205 struct rcu_head rcu;
206 };
207
208
209 struct neigh_table {
210 int family;
211 unsigned int entry_size;
212 unsigned int key_len;
213 __be16 protocol;
214 __u32 (*hash)(const void *pkey,
215 const struct net_device *dev,
216 __u32 *hash_rnd);
217 bool (*key_eq)(const struct neighbour *, const void *pkey);
218 int (*constructor)(struct neighbour *);
219 int (*pconstructor)(struct pneigh_entry *);
220 void (*pdestructor)(struct pneigh_entry *);
221 void (*proxy_redo)(struct sk_buff *skb);
222 int (*is_multicast)(const void *pkey);
223 bool (*allow_add)(const struct net_device *dev,
224 struct netlink_ext_ack *extack);
225 char *id;
226 struct neigh_parms parms;
227 struct list_head parms_list;
228 int gc_interval;
229 int gc_thresh1;
230 int gc_thresh2;
231 int gc_thresh3;
232 unsigned long last_flush;
233 struct delayed_work gc_work;
234 struct delayed_work managed_work;
235 struct timer_list proxy_timer;
236 struct sk_buff_head proxy_queue;
237 atomic_t entries;
238 atomic_t gc_entries;
239 struct list_head gc_list;
240 struct list_head managed_list;
241 spinlock_t lock;
242 unsigned long last_rand;
243 struct neigh_statistics __percpu *stats;
244 struct neigh_hash_table __rcu *nht;
245 struct mutex phash_lock;
246 struct pneigh_entry __rcu **phash_buckets;
247 };
248
neigh_parms_family(struct neigh_parms * p)249 static inline int neigh_parms_family(struct neigh_parms *p)
250 {
251 return p->tbl->family;
252 }
253
254 #define NEIGH_PRIV_ALIGN sizeof(long long)
255 #define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN)
256
neighbour_priv(const struct neighbour * n)257 static inline void *neighbour_priv(const struct neighbour *n)
258 {
259 return (char *)n + n->tbl->entry_size;
260 }
261
262 /* flags for neigh_update() */
263 #define NEIGH_UPDATE_F_OVERRIDE BIT(0)
264 #define NEIGH_UPDATE_F_WEAK_OVERRIDE BIT(1)
265 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER BIT(2)
266 #define NEIGH_UPDATE_F_USE BIT(3)
267 #define NEIGH_UPDATE_F_MANAGED BIT(4)
268 #define NEIGH_UPDATE_F_EXT_LEARNED BIT(5)
269 #define NEIGH_UPDATE_F_ISROUTER BIT(6)
270 #define NEIGH_UPDATE_F_ADMIN BIT(7)
271 #define NEIGH_UPDATE_F_EXT_VALIDATED BIT(8)
272
273 /* In-kernel representation for NDA_FLAGS_EXT flags: */
274 #define NTF_OLD_MASK 0xff
275 #define NTF_EXT_SHIFT 8
276 #define NTF_EXT_MASK (NTF_EXT_MANAGED | NTF_EXT_EXT_VALIDATED)
277
278 #define NTF_MANAGED (NTF_EXT_MANAGED << NTF_EXT_SHIFT)
279 #define NTF_EXT_VALIDATED (NTF_EXT_EXT_VALIDATED << NTF_EXT_SHIFT)
280
281 extern const struct nla_policy nda_policy[];
282
283 #define neigh_for_each_in_bucket(pos, head) hlist_for_each_entry(pos, head, hash)
284 #define neigh_for_each_in_bucket_rcu(pos, head) \
285 hlist_for_each_entry_rcu(pos, head, hash)
286 #define neigh_for_each_in_bucket_safe(pos, tmp, head) \
287 hlist_for_each_entry_safe(pos, tmp, head, hash)
288
neigh_key_eq32(const struct neighbour * n,const void * pkey)289 static inline bool neigh_key_eq32(const struct neighbour *n, const void *pkey)
290 {
291 return *(const u32 *)n->primary_key == *(const u32 *)pkey;
292 }
293
neigh_key_eq128(const struct neighbour * n,const void * pkey)294 static inline bool neigh_key_eq128(const struct neighbour *n, const void *pkey)
295 {
296 const u32 *n32 = (const u32 *)n->primary_key;
297 const u32 *p32 = pkey;
298
299 return ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) |
300 (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0;
301 }
302
___neigh_lookup_noref(struct neigh_table * tbl,bool (* key_eq)(const struct neighbour * n,const void * pkey),__u32 (* hash)(const void * pkey,const struct net_device * dev,__u32 * hash_rnd),const void * pkey,struct net_device * dev)303 static inline struct neighbour *___neigh_lookup_noref(
304 struct neigh_table *tbl,
305 bool (*key_eq)(const struct neighbour *n, const void *pkey),
306 __u32 (*hash)(const void *pkey,
307 const struct net_device *dev,
308 __u32 *hash_rnd),
309 const void *pkey,
310 struct net_device *dev)
311 {
312 struct neigh_hash_table *nht = rcu_dereference(tbl->nht);
313 struct neighbour *n;
314 u32 hash_val;
315
316 hash_val = hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
317 neigh_for_each_in_bucket_rcu(n, &nht->hash_heads[hash_val])
318 if (n->dev == dev && key_eq(n, pkey))
319 return n;
320
321 return NULL;
322 }
323
__neigh_lookup_noref(struct neigh_table * tbl,const void * pkey,struct net_device * dev)324 static inline struct neighbour *__neigh_lookup_noref(struct neigh_table *tbl,
325 const void *pkey,
326 struct net_device *dev)
327 {
328 return ___neigh_lookup_noref(tbl, tbl->key_eq, tbl->hash, pkey, dev);
329 }
330
neigh_confirm(struct neighbour * n)331 static inline void neigh_confirm(struct neighbour *n)
332 {
333 if (n) {
334 unsigned long now = jiffies;
335
336 /* avoid dirtying neighbour */
337 if (READ_ONCE(n->confirmed) != now)
338 WRITE_ONCE(n->confirmed, now);
339 }
340 }
341
342 void neigh_table_init(int index, struct neigh_table *tbl);
343 int neigh_table_clear(int index, struct neigh_table *tbl);
344 struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
345 struct net_device *dev);
346 struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey,
347 struct net_device *dev, bool want_ref);
neigh_create(struct neigh_table * tbl,const void * pkey,struct net_device * dev)348 static inline struct neighbour *neigh_create(struct neigh_table *tbl,
349 const void *pkey,
350 struct net_device *dev)
351 {
352 return __neigh_create(tbl, pkey, dev, true);
353 }
354 void neigh_destroy(struct neighbour *neigh);
355 int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb,
356 const bool immediate_ok);
357 int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags,
358 u32 nlmsg_pid);
359 void __neigh_set_probe_once(struct neighbour *neigh);
360 bool neigh_remove_one(struct neighbour *ndel);
361 void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
362 int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
363 int neigh_carrier_down(struct neigh_table *tbl, struct net_device *dev);
364 int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb);
365 int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb);
366 int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb);
367 struct neighbour *neigh_event_ns(struct neigh_table *tbl,
368 u8 *lladdr, void *saddr,
369 struct net_device *dev);
370
371 struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
372 struct neigh_table *tbl);
373 void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
374
375 static inline
neigh_parms_net(const struct neigh_parms * parms)376 struct net *neigh_parms_net(const struct neigh_parms *parms)
377 {
378 return read_pnet(&parms->net);
379 }
380
381 unsigned long neigh_rand_reach_time(unsigned long base);
382
neigh_set_reach_time(struct neigh_parms * p)383 static inline void neigh_set_reach_time(struct neigh_parms *p)
384 {
385 unsigned long base = NEIGH_VAR(p, BASE_REACHABLE_TIME);
386
387 WRITE_ONCE(p->reachable_time, neigh_rand_reach_time(base));
388 }
389
390 void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
391 struct sk_buff *skb);
392 struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net,
393 const void *key, struct net_device *dev);
394 int pneigh_create(struct neigh_table *tbl, struct net *net, const void *key,
395 struct net_device *dev, u32 flags, u8 protocol,
396 bool permanent);
397 int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key,
398 struct net_device *dev);
399
pneigh_net(const struct pneigh_entry * pneigh)400 static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
401 {
402 return read_pnet(&pneigh->net);
403 }
404
405 void neigh_app_ns(struct neighbour *n);
406 void neigh_for_each(struct neigh_table *tbl,
407 void (*cb)(struct neighbour *, void *), void *cookie);
408 void __neigh_for_each_release(struct neigh_table *tbl,
409 int (*cb)(struct neighbour *));
410 int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *);
411
412 struct neigh_seq_state {
413 struct seq_net_private p;
414 struct neigh_table *tbl;
415 struct neigh_hash_table *nht;
416 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
417 struct neighbour *n, loff_t *pos);
418 unsigned int bucket;
419 unsigned int flags;
420 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
421 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
422 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
423 };
424 void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *,
425 unsigned int);
426 void *neigh_seq_next(struct seq_file *, void *, loff_t *);
427 void neigh_seq_stop(struct seq_file *, void *);
428
429 int neigh_proc_dointvec(const struct ctl_table *ctl, int write,
430 void *buffer, size_t *lenp, loff_t *ppos);
431 int neigh_proc_dointvec_jiffies(const struct ctl_table *ctl, int write,
432 void *buffer,
433 size_t *lenp, loff_t *ppos);
434 int neigh_proc_dointvec_ms_jiffies(const struct ctl_table *ctl, int write,
435 void *buffer, size_t *lenp, loff_t *ppos);
436
437 int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
438 proc_handler *proc_handler);
439 void neigh_sysctl_unregister(struct neigh_parms *p);
440
__neigh_parms_put(struct neigh_parms * parms)441 static inline void __neigh_parms_put(struct neigh_parms *parms)
442 {
443 refcount_dec(&parms->refcnt);
444 }
445
neigh_parms_clone(struct neigh_parms * parms)446 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
447 {
448 refcount_inc(&parms->refcnt);
449 return parms;
450 }
451
452 /*
453 * Neighbour references
454 */
455
neigh_release(struct neighbour * neigh)456 static inline void neigh_release(struct neighbour *neigh)
457 {
458 if (refcount_dec_and_test(&neigh->refcnt))
459 neigh_destroy(neigh);
460 }
461
neigh_clone(struct neighbour * neigh)462 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
463 {
464 if (neigh)
465 refcount_inc(&neigh->refcnt);
466 return neigh;
467 }
468
469 #define neigh_hold(n) refcount_inc(&(n)->refcnt)
470
neigh_event_send_probe(struct neighbour * neigh,struct sk_buff * skb,const bool immediate_ok)471 static __always_inline int neigh_event_send_probe(struct neighbour *neigh,
472 struct sk_buff *skb,
473 const bool immediate_ok)
474 {
475 unsigned long now = jiffies;
476
477 if (READ_ONCE(neigh->used) != now)
478 WRITE_ONCE(neigh->used, now);
479 if (!(READ_ONCE(neigh->nud_state) & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)))
480 return __neigh_event_send(neigh, skb, immediate_ok);
481 return 0;
482 }
483
neigh_event_send(struct neighbour * neigh,struct sk_buff * skb)484 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
485 {
486 return neigh_event_send_probe(neigh, skb, true);
487 }
488
489 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
neigh_hh_bridge(struct hh_cache * hh,struct sk_buff * skb)490 static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
491 {
492 unsigned int seq, hh_alen;
493
494 do {
495 seq = read_seqbegin(&hh->hh_lock);
496 hh_alen = HH_DATA_ALIGN(ETH_HLEN);
497 memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
498 } while (read_seqretry(&hh->hh_lock, seq));
499 return 0;
500 }
501 #endif
502
neigh_hh_output(const struct hh_cache * hh,struct sk_buff * skb)503 static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
504 {
505 unsigned int hh_alen = 0;
506 unsigned int seq;
507 unsigned int hh_len;
508
509 do {
510 seq = read_seqbegin(&hh->hh_lock);
511 hh_len = READ_ONCE(hh->hh_len);
512 if (likely(hh_len <= HH_DATA_MOD)) {
513 hh_alen = HH_DATA_MOD;
514
515 /* skb_push() would proceed silently if we have room for
516 * the unaligned size but not for the aligned size:
517 * check headroom explicitly.
518 */
519 if (likely(skb_headroom(skb) >= HH_DATA_MOD)) {
520 /* this is inlined by gcc */
521 memcpy(skb->data - HH_DATA_MOD, hh->hh_data,
522 HH_DATA_MOD);
523 }
524 } else {
525 hh_alen = HH_DATA_ALIGN(hh_len);
526
527 if (likely(skb_headroom(skb) >= hh_alen)) {
528 memcpy(skb->data - hh_alen, hh->hh_data,
529 hh_alen);
530 }
531 }
532 } while (read_seqretry(&hh->hh_lock, seq));
533
534 if (WARN_ON_ONCE(skb_headroom(skb) < hh_alen)) {
535 kfree_skb(skb);
536 return NET_XMIT_DROP;
537 }
538
539 __skb_push(skb, hh_len);
540 return dev_queue_xmit(skb);
541 }
542
neigh_output(struct neighbour * n,struct sk_buff * skb,bool skip_cache)543 static inline int neigh_output(struct neighbour *n, struct sk_buff *skb,
544 bool skip_cache)
545 {
546 const struct hh_cache *hh = &n->hh;
547
548 /* n->nud_state and hh->hh_len could be changed under us.
549 * neigh_hh_output() is taking care of the race later.
550 */
551 if (!skip_cache &&
552 (READ_ONCE(n->nud_state) & NUD_CONNECTED) &&
553 READ_ONCE(hh->hh_len))
554 return neigh_hh_output(hh, skb);
555
556 return READ_ONCE(n->output)(n, skb);
557 }
558
559 static inline struct neighbour *
__neigh_lookup(struct neigh_table * tbl,const void * pkey,struct net_device * dev,int creat)560 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
561 {
562 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
563
564 if (n || !creat)
565 return n;
566
567 n = neigh_create(tbl, pkey, dev);
568 return IS_ERR(n) ? NULL : n;
569 }
570
571 static inline struct neighbour *
__neigh_lookup_errno(struct neigh_table * tbl,const void * pkey,struct net_device * dev)572 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
573 struct net_device *dev)
574 {
575 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
576
577 if (n)
578 return n;
579
580 return neigh_create(tbl, pkey, dev);
581 }
582
583 struct neighbour_cb {
584 unsigned long sched_next;
585 unsigned int flags;
586 };
587
588 #define LOCALLY_ENQUEUED 0x1
589
590 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
591
neigh_ha_snapshot(char * dst,const struct neighbour * n,const struct net_device * dev)592 static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
593 const struct net_device *dev)
594 {
595 unsigned int seq;
596
597 do {
598 seq = read_seqbegin(&n->ha_lock);
599 memcpy(dst, n->ha, dev->addr_len);
600 } while (read_seqretry(&n->ha_lock, seq));
601 }
602
neigh_update_is_router(struct neighbour * neigh,u32 flags,int * notify)603 static inline void neigh_update_is_router(struct neighbour *neigh, u32 flags,
604 int *notify)
605 {
606 u8 ndm_flags = 0;
607
608 ndm_flags |= (flags & NEIGH_UPDATE_F_ISROUTER) ? NTF_ROUTER : 0;
609 if ((neigh->flags ^ ndm_flags) & NTF_ROUTER) {
610 if (ndm_flags & NTF_ROUTER)
611 neigh->flags |= NTF_ROUTER;
612 else
613 neigh->flags &= ~NTF_ROUTER;
614 *notify = 1;
615 }
616 }
617 #endif
618