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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _NET_NEIGHBOUR_H |
2 | #define _NET_NEIGHBOUR_H | |
3 | ||
9067c722 TG |
4 | #include <linux/neighbour.h> |
5 | ||
1da177e4 LT |
6 | /* |
7 | * Generic neighbour manipulation | |
8 | * | |
9 | * Authors: | |
10 | * Pedro Roque <roque@di.fc.ul.pt> | |
11 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
12 | * | |
13 | * Changes: | |
14 | * | |
15 | * Harald Welte: <laforge@gnumonks.org> | |
16 | * - Add neighbour cache statistics like rtstat | |
17 | */ | |
18 | ||
60063497 | 19 | #include <linux/atomic.h> |
1da177e4 | 20 | #include <linux/netdevice.h> |
14c85021 | 21 | #include <linux/skbuff.h> |
1da177e4 LT |
22 | #include <linux/rcupdate.h> |
23 | #include <linux/seq_file.h> | |
1d4c8c29 | 24 | #include <linux/bitmap.h> |
1da177e4 LT |
25 | |
26 | #include <linux/err.h> | |
27 | #include <linux/sysctl.h> | |
e4c4e448 | 28 | #include <linux/workqueue.h> |
c8822a4e | 29 | #include <net/rtnetlink.h> |
1da177e4 | 30 | |
39971554 PE |
31 | /* |
32 | * NUD stands for "neighbor unreachability detection" | |
33 | */ | |
34 | ||
1da177e4 LT |
35 | #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) |
36 | #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) | |
37 | #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) | |
38 | ||
39 | struct neighbour; | |
40 | ||
1f9248e5 JP |
41 | enum { |
42 | NEIGH_VAR_MCAST_PROBES, | |
43 | NEIGH_VAR_UCAST_PROBES, | |
44 | NEIGH_VAR_APP_PROBES, | |
8da86466 | 45 | NEIGH_VAR_MCAST_REPROBES, |
1f9248e5 JP |
46 | NEIGH_VAR_RETRANS_TIME, |
47 | NEIGH_VAR_BASE_REACHABLE_TIME, | |
48 | NEIGH_VAR_DELAY_PROBE_TIME, | |
49 | NEIGH_VAR_GC_STALETIME, | |
50 | NEIGH_VAR_QUEUE_LEN_BYTES, | |
51 | NEIGH_VAR_PROXY_QLEN, | |
52 | NEIGH_VAR_ANYCAST_DELAY, | |
53 | NEIGH_VAR_PROXY_DELAY, | |
54 | NEIGH_VAR_LOCKTIME, | |
55 | #define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1) | |
56 | /* Following are used as a second way to access one of the above */ | |
57 | NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */ | |
58 | NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */ | |
59 | NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */ | |
60 | /* Following are used by "default" only */ | |
61 | NEIGH_VAR_GC_INTERVAL, | |
62 | NEIGH_VAR_GC_THRESH1, | |
63 | NEIGH_VAR_GC_THRESH2, | |
64 | NEIGH_VAR_GC_THRESH3, | |
65 | NEIGH_VAR_MAX | |
66 | }; | |
67 | ||
fd2c3ef7 | 68 | struct neigh_parms { |
0c5c9fb5 | 69 | possible_net_t net; |
c7fb64db | 70 | struct net_device *dev; |
75fbfd33 | 71 | struct list_head list; |
447f2191 | 72 | int (*neigh_setup)(struct neighbour *); |
ecbb4169 | 73 | void (*neigh_cleanup)(struct neighbour *); |
1da177e4 | 74 | struct neigh_table *tbl; |
1da177e4 LT |
75 | |
76 | void *sysctl_table; | |
77 | ||
78 | int dead; | |
79 | atomic_t refcnt; | |
80 | struct rcu_head rcu_head; | |
81 | ||
1da177e4 | 82 | int reachable_time; |
1f9248e5 | 83 | int data[NEIGH_VAR_DATA_MAX]; |
1d4c8c29 | 84 | DECLARE_BITMAP(data_state, NEIGH_VAR_DATA_MAX); |
1da177e4 LT |
85 | }; |
86 | ||
1f9248e5 JP |
87 | static inline void neigh_var_set(struct neigh_parms *p, int index, int val) |
88 | { | |
1d4c8c29 | 89 | set_bit(index, p->data_state); |
1f9248e5 JP |
90 | p->data[index] = val; |
91 | } | |
92 | ||
93 | #define NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr]) | |
89740ca7 JP |
94 | |
95 | /* In ndo_neigh_setup, NEIGH_VAR_INIT should be used. | |
96 | * In other cases, NEIGH_VAR_SET should be used. | |
97 | */ | |
98 | #define NEIGH_VAR_INIT(p, attr, val) (NEIGH_VAR(p, attr) = val) | |
1f9248e5 JP |
99 | #define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val) |
100 | ||
1d4c8c29 JP |
101 | static inline void neigh_parms_data_state_setall(struct neigh_parms *p) |
102 | { | |
103 | bitmap_fill(p->data_state, NEIGH_VAR_DATA_MAX); | |
104 | } | |
105 | ||
106 | static inline void neigh_parms_data_state_cleanall(struct neigh_parms *p) | |
107 | { | |
108 | bitmap_zero(p->data_state, NEIGH_VAR_DATA_MAX); | |
109 | } | |
110 | ||
fd2c3ef7 | 111 | struct neigh_statistics { |
1da177e4 LT |
112 | unsigned long allocs; /* number of allocated neighs */ |
113 | unsigned long destroys; /* number of destroyed neighs */ | |
114 | unsigned long hash_grows; /* number of hash resizes */ | |
115 | ||
9a6d276e | 116 | unsigned long res_failed; /* number of failed resolutions */ |
1da177e4 LT |
117 | |
118 | unsigned long lookups; /* number of lookups */ | |
119 | unsigned long hits; /* number of hits (among lookups) */ | |
120 | ||
121 | unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ | |
122 | unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ | |
123 | ||
124 | unsigned long periodic_gc_runs; /* number of periodic GC runs */ | |
125 | unsigned long forced_gc_runs; /* number of forced GC runs */ | |
9a6d276e NH |
126 | |
127 | unsigned long unres_discards; /* number of unresolved drops */ | |
1da177e4 LT |
128 | }; |
129 | ||
4ea7334b | 130 | #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) |
1da177e4 | 131 | |
fd2c3ef7 | 132 | struct neighbour { |
767e97e1 | 133 | struct neighbour __rcu *next; |
1da177e4 LT |
134 | struct neigh_table *tbl; |
135 | struct neigh_parms *parms; | |
1da177e4 LT |
136 | unsigned long confirmed; |
137 | unsigned long updated; | |
46b13fc5 | 138 | rwlock_t lock; |
367e5e37 | 139 | atomic_t refcnt; |
e37ef961 | 140 | struct sk_buff_head arp_queue; |
8b5c171b | 141 | unsigned int arp_queue_len_bytes; |
e37ef961 ED |
142 | struct timer_list timer; |
143 | unsigned long used; | |
1da177e4 | 144 | atomic_t probes; |
46b13fc5 ED |
145 | __u8 flags; |
146 | __u8 nud_state; | |
147 | __u8 type; | |
148 | __u8 dead; | |
0ed8ddf4 | 149 | seqlock_t ha_lock; |
d924424a | 150 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
f6b72b62 | 151 | struct hh_cache hh; |
8f40b161 | 152 | int (*output)(struct neighbour *, struct sk_buff *); |
89d69d2b | 153 | const struct neigh_ops *ops; |
767e97e1 | 154 | struct rcu_head rcu; |
e37ef961 | 155 | struct net_device *dev; |
1da177e4 LT |
156 | u8 primary_key[0]; |
157 | }; | |
158 | ||
fd2c3ef7 | 159 | struct neigh_ops { |
1da177e4 | 160 | int family; |
8f40b161 DM |
161 | void (*solicit)(struct neighbour *, struct sk_buff *); |
162 | void (*error_report)(struct neighbour *, struct sk_buff *); | |
163 | int (*output)(struct neighbour *, struct sk_buff *); | |
164 | int (*connected_output)(struct neighbour *, struct sk_buff *); | |
1da177e4 LT |
165 | }; |
166 | ||
fd2c3ef7 | 167 | struct pneigh_entry { |
1da177e4 | 168 | struct pneigh_entry *next; |
0c5c9fb5 | 169 | possible_net_t net; |
426b5303 | 170 | struct net_device *dev; |
62dd9318 | 171 | u8 flags; |
1da177e4 LT |
172 | u8 key[0]; |
173 | }; | |
174 | ||
175 | /* | |
176 | * neighbour table manipulation | |
177 | */ | |
178 | ||
2c2aba6c DM |
179 | #define NEIGH_NUM_HASH_RND 4 |
180 | ||
d6bf7817 | 181 | struct neigh_hash_table { |
767e97e1 | 182 | struct neighbour __rcu **hash_buckets; |
cd089336 | 183 | unsigned int hash_shift; |
2c2aba6c | 184 | __u32 hash_rnd[NEIGH_NUM_HASH_RND]; |
d6bf7817 ED |
185 | struct rcu_head rcu; |
186 | }; | |
187 | ||
1da177e4 | 188 | |
fd2c3ef7 | 189 | struct neigh_table { |
1da177e4 LT |
190 | int family; |
191 | int entry_size; | |
192 | int key_len; | |
bdf53c58 | 193 | __be16 protocol; |
d6bf7817 ED |
194 | __u32 (*hash)(const void *pkey, |
195 | const struct net_device *dev, | |
2c2aba6c | 196 | __u32 *hash_rnd); |
60395a20 | 197 | bool (*key_eq)(const struct neighbour *, const void *pkey); |
1da177e4 LT |
198 | int (*constructor)(struct neighbour *); |
199 | int (*pconstructor)(struct pneigh_entry *); | |
200 | void (*pdestructor)(struct pneigh_entry *); | |
201 | void (*proxy_redo)(struct sk_buff *skb); | |
202 | char *id; | |
203 | struct neigh_parms parms; | |
75fbfd33 | 204 | struct list_head parms_list; |
1da177e4 LT |
205 | int gc_interval; |
206 | int gc_thresh1; | |
207 | int gc_thresh2; | |
208 | int gc_thresh3; | |
209 | unsigned long last_flush; | |
e4c4e448 | 210 | struct delayed_work gc_work; |
1da177e4 LT |
211 | struct timer_list proxy_timer; |
212 | struct sk_buff_head proxy_queue; | |
213 | atomic_t entries; | |
214 | rwlock_t lock; | |
215 | unsigned long last_rand; | |
7d720c3e | 216 | struct neigh_statistics __percpu *stats; |
d6bf7817 | 217 | struct neigh_hash_table __rcu *nht; |
1da177e4 | 218 | struct pneigh_entry **phash_buckets; |
1da177e4 LT |
219 | }; |
220 | ||
d7480fd3 WC |
221 | enum { |
222 | NEIGH_ARP_TABLE = 0, | |
223 | NEIGH_ND_TABLE = 1, | |
224 | NEIGH_DN_TABLE = 2, | |
225 | NEIGH_NR_TABLES, | |
b79bda3d | 226 | NEIGH_LINK_TABLE = NEIGH_NR_TABLES /* Pseudo table for neigh_xmit */ |
d7480fd3 WC |
227 | }; |
228 | ||
73af614a JP |
229 | static inline int neigh_parms_family(struct neigh_parms *p) |
230 | { | |
231 | return p->tbl->family; | |
232 | } | |
233 | ||
1026fec8 | 234 | #define NEIGH_PRIV_ALIGN sizeof(long long) |
daaba4fa | 235 | #define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN) |
1026fec8 DM |
236 | |
237 | static inline void *neighbour_priv(const struct neighbour *n) | |
238 | { | |
08433eff | 239 | return (char *)n + n->tbl->entry_size; |
1026fec8 DM |
240 | } |
241 | ||
1da177e4 LT |
242 | /* flags for neigh_update() */ |
243 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
244 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
245 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
246 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
247 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
248 | ||
60395a20 EB |
249 | |
250 | static inline bool neigh_key_eq16(const struct neighbour *n, const void *pkey) | |
251 | { | |
252 | return *(const u16 *)n->primary_key == *(const u16 *)pkey; | |
253 | } | |
254 | ||
255 | static inline bool neigh_key_eq32(const struct neighbour *n, const void *pkey) | |
256 | { | |
257 | return *(const u32 *)n->primary_key == *(const u32 *)pkey; | |
258 | } | |
259 | ||
260 | static inline bool neigh_key_eq128(const struct neighbour *n, const void *pkey) | |
261 | { | |
262 | const u32 *n32 = (const u32 *)n->primary_key; | |
263 | const u32 *p32 = pkey; | |
264 | ||
265 | return ((n32[0] ^ p32[0]) | (n32[1] ^ p32[1]) | | |
266 | (n32[2] ^ p32[2]) | (n32[3] ^ p32[3])) == 0; | |
267 | } | |
268 | ||
269 | static inline struct neighbour *___neigh_lookup_noref( | |
270 | struct neigh_table *tbl, | |
271 | bool (*key_eq)(const struct neighbour *n, const void *pkey), | |
272 | __u32 (*hash)(const void *pkey, | |
273 | const struct net_device *dev, | |
274 | __u32 *hash_rnd), | |
275 | const void *pkey, | |
276 | struct net_device *dev) | |
277 | { | |
278 | struct neigh_hash_table *nht = rcu_dereference_bh(tbl->nht); | |
279 | struct neighbour *n; | |
280 | u32 hash_val; | |
281 | ||
282 | hash_val = hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); | |
283 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); | |
284 | n != NULL; | |
285 | n = rcu_dereference_bh(n->next)) { | |
286 | if (n->dev == dev && key_eq(n, pkey)) | |
287 | return n; | |
288 | } | |
289 | ||
290 | return NULL; | |
291 | } | |
292 | ||
293 | static inline struct neighbour *__neigh_lookup_noref(struct neigh_table *tbl, | |
294 | const void *pkey, | |
295 | struct net_device *dev) | |
296 | { | |
297 | return ___neigh_lookup_noref(tbl, tbl->key_eq, tbl->hash, pkey, dev); | |
298 | } | |
299 | ||
d7480fd3 WC |
300 | void neigh_table_init(int index, struct neigh_table *tbl); |
301 | int neigh_table_clear(int index, struct neigh_table *tbl); | |
90972b22 JP |
302 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, |
303 | struct net_device *dev); | |
304 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, | |
305 | const void *pkey); | |
306 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
307 | struct net_device *dev, bool want_ref); | |
a263b309 | 308 | static inline struct neighbour *neigh_create(struct neigh_table *tbl, |
1da177e4 | 309 | const void *pkey, |
a263b309 DM |
310 | struct net_device *dev) |
311 | { | |
312 | return __neigh_create(tbl, pkey, dev, true); | |
313 | } | |
90972b22 JP |
314 | void neigh_destroy(struct neighbour *neigh); |
315 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
316 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags); | |
7e980569 | 317 | void __neigh_set_probe_once(struct neighbour *neigh); |
90972b22 JP |
318 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); |
319 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
320 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb); | |
321 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); | |
90972b22 JP |
322 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb); |
323 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1da177e4 LT |
324 | u8 *lladdr, void *saddr, |
325 | struct net_device *dev); | |
326 | ||
90972b22 JP |
327 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
328 | struct neigh_table *tbl); | |
329 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
57da52c1 YH |
330 | |
331 | static inline | |
90972b22 | 332 | struct net *neigh_parms_net(const struct neigh_parms *parms) |
57da52c1 | 333 | { |
e42ea986 | 334 | return read_pnet(&parms->net); |
57da52c1 YH |
335 | } |
336 | ||
90972b22 | 337 | unsigned long neigh_rand_reach_time(unsigned long base); |
1da177e4 | 338 | |
90972b22 JP |
339 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
340 | struct sk_buff *skb); | |
341 | struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
342 | const void *key, struct net_device *dev, | |
343 | int creat); | |
344 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
345 | const void *key, struct net_device *dev); | |
346 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, | |
347 | struct net_device *dev); | |
1da177e4 | 348 | |
90972b22 | 349 | static inline struct net *pneigh_net(const struct pneigh_entry *pneigh) |
57da52c1 | 350 | { |
e42ea986 | 351 | return read_pnet(&pneigh->net); |
57da52c1 YH |
352 | } |
353 | ||
90972b22 JP |
354 | void neigh_app_ns(struct neighbour *n); |
355 | void neigh_for_each(struct neigh_table *tbl, | |
356 | void (*cb)(struct neighbour *, void *), void *cookie); | |
357 | void __neigh_for_each_release(struct neigh_table *tbl, | |
358 | int (*cb)(struct neighbour *)); | |
4fd3d7d9 | 359 | int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *); |
90972b22 JP |
360 | void pneigh_for_each(struct neigh_table *tbl, |
361 | void (*cb)(struct pneigh_entry *)); | |
1da177e4 LT |
362 | |
363 | struct neigh_seq_state { | |
42508461 | 364 | struct seq_net_private p; |
1da177e4 | 365 | struct neigh_table *tbl; |
d6bf7817 | 366 | struct neigh_hash_table *nht; |
1da177e4 LT |
367 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, |
368 | struct neighbour *n, loff_t *pos); | |
369 | unsigned int bucket; | |
370 | unsigned int flags; | |
371 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
372 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
373 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
374 | }; | |
90972b22 JP |
375 | void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, |
376 | unsigned int); | |
377 | void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
378 | void neigh_seq_stop(struct seq_file *, void *); | |
379 | ||
cb5b09c1 JP |
380 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
381 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
382 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
383 | void __user *buffer, | |
384 | size_t *lenp, loff_t *ppos); | |
385 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
386 | void __user *buffer, | |
387 | size_t *lenp, loff_t *ppos); | |
388 | ||
90972b22 | 389 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, |
73af614a | 390 | proc_handler *proc_handler); |
90972b22 | 391 | void neigh_sysctl_unregister(struct neigh_parms *p); |
1da177e4 LT |
392 | |
393 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
394 | { | |
395 | atomic_dec(&parms->refcnt); | |
396 | } | |
397 | ||
1da177e4 LT |
398 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
399 | { | |
400 | atomic_inc(&parms->refcnt); | |
401 | return parms; | |
402 | } | |
403 | ||
404 | /* | |
405 | * Neighbour references | |
406 | */ | |
407 | ||
408 | static inline void neigh_release(struct neighbour *neigh) | |
409 | { | |
410 | if (atomic_dec_and_test(&neigh->refcnt)) | |
411 | neigh_destroy(neigh); | |
412 | } | |
413 | ||
414 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
415 | { | |
416 | if (neigh) | |
417 | atomic_inc(&neigh->refcnt); | |
418 | return neigh; | |
419 | } | |
420 | ||
421 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
422 | ||
1da177e4 LT |
423 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
424 | { | |
ef22b7b6 | 425 | unsigned long now = jiffies; |
0ed8ddf4 ED |
426 | |
427 | if (neigh->used != now) | |
428 | neigh->used = now; | |
1da177e4 LT |
429 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
430 | return __neigh_event_send(neigh, skb); | |
431 | return 0; | |
432 | } | |
433 | ||
34666d46 | 434 | #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) |
e179e632 BDS |
435 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) |
436 | { | |
95c96174 | 437 | unsigned int seq, hh_alen; |
e179e632 BDS |
438 | |
439 | do { | |
440 | seq = read_seqbegin(&hh->hh_lock); | |
441 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
442 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
443 | } while (read_seqretry(&hh->hh_lock, seq)); | |
444 | return 0; | |
445 | } | |
446 | #endif | |
447 | ||
425f09ab | 448 | static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) |
3644f0ce | 449 | { |
95c96174 | 450 | unsigned int seq; |
3644f0ce SH |
451 | int hh_len; |
452 | ||
453 | do { | |
3644f0ce SH |
454 | seq = read_seqbegin(&hh->hh_lock); |
455 | hh_len = hh->hh_len; | |
425f09ab ED |
456 | if (likely(hh_len <= HH_DATA_MOD)) { |
457 | /* this is inlined by gcc */ | |
458 | memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD); | |
459 | } else { | |
460 | int hh_alen = HH_DATA_ALIGN(hh_len); | |
461 | ||
462 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
463 | } | |
3644f0ce SH |
464 | } while (read_seqretry(&hh->hh_lock, seq)); |
465 | ||
466 | skb_push(skb, hh_len); | |
b23b5455 | 467 | return dev_queue_xmit(skb); |
3644f0ce SH |
468 | } |
469 | ||
1da177e4 LT |
470 | static inline struct neighbour * |
471 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
472 | { | |
473 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
474 | ||
475 | if (n || !creat) | |
476 | return n; | |
477 | ||
478 | n = neigh_create(tbl, pkey, dev); | |
479 | return IS_ERR(n) ? NULL : n; | |
480 | } | |
481 | ||
482 | static inline struct neighbour * | |
483 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
484 | struct net_device *dev) | |
485 | { | |
486 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
487 | ||
488 | if (n) | |
489 | return n; | |
490 | ||
491 | return neigh_create(tbl, pkey, dev); | |
492 | } | |
493 | ||
a61bbcf2 PM |
494 | struct neighbour_cb { |
495 | unsigned long sched_next; | |
496 | unsigned int flags; | |
497 | }; | |
498 | ||
499 | #define LOCALLY_ENQUEUED 0x1 | |
500 | ||
501 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 | 502 | |
0ed8ddf4 ED |
503 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
504 | const struct net_device *dev) | |
505 | { | |
506 | unsigned int seq; | |
507 | ||
508 | do { | |
509 | seq = read_seqbegin(&n->ha_lock); | |
510 | memcpy(dst, n->ha, dev->addr_len); | |
511 | } while (read_seqretry(&n->ha_lock, seq)); | |
512 | } | |
4fd3d7d9 EB |
513 | |
514 | ||
1da177e4 | 515 | #endif |