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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> | |
24 | ||
25 | #include <linux/err.h> | |
26 | #include <linux/sysctl.h> | |
e4c4e448 | 27 | #include <linux/workqueue.h> |
c8822a4e | 28 | #include <net/rtnetlink.h> |
1da177e4 | 29 | |
39971554 PE |
30 | /* |
31 | * NUD stands for "neighbor unreachability detection" | |
32 | */ | |
33 | ||
1da177e4 LT |
34 | #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) |
35 | #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) | |
36 | #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) | |
37 | ||
38 | struct neighbour; | |
39 | ||
1f9248e5 JP |
40 | enum { |
41 | NEIGH_VAR_MCAST_PROBES, | |
42 | NEIGH_VAR_UCAST_PROBES, | |
43 | NEIGH_VAR_APP_PROBES, | |
44 | NEIGH_VAR_RETRANS_TIME, | |
45 | NEIGH_VAR_BASE_REACHABLE_TIME, | |
46 | NEIGH_VAR_DELAY_PROBE_TIME, | |
47 | NEIGH_VAR_GC_STALETIME, | |
48 | NEIGH_VAR_QUEUE_LEN_BYTES, | |
49 | NEIGH_VAR_PROXY_QLEN, | |
50 | NEIGH_VAR_ANYCAST_DELAY, | |
51 | NEIGH_VAR_PROXY_DELAY, | |
52 | NEIGH_VAR_LOCKTIME, | |
53 | #define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1) | |
54 | /* Following are used as a second way to access one of the above */ | |
55 | NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */ | |
56 | NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */ | |
57 | NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */ | |
58 | /* Following are used by "default" only */ | |
59 | NEIGH_VAR_GC_INTERVAL, | |
60 | NEIGH_VAR_GC_THRESH1, | |
61 | NEIGH_VAR_GC_THRESH2, | |
62 | NEIGH_VAR_GC_THRESH3, | |
63 | NEIGH_VAR_MAX | |
64 | }; | |
65 | ||
fd2c3ef7 | 66 | struct neigh_parms { |
57da52c1 | 67 | #ifdef CONFIG_NET_NS |
426b5303 | 68 | struct net *net; |
57da52c1 | 69 | #endif |
c7fb64db | 70 | struct net_device *dev; |
1da177e4 | 71 | struct neigh_parms *next; |
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]; |
1da177e4 LT |
84 | }; |
85 | ||
1f9248e5 JP |
86 | static inline void neigh_var_set(struct neigh_parms *p, int index, int val) |
87 | { | |
88 | p->data[index] = val; | |
89 | } | |
90 | ||
91 | #define NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr]) | |
92 | #define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val) | |
93 | ||
fd2c3ef7 | 94 | struct neigh_statistics { |
1da177e4 LT |
95 | unsigned long allocs; /* number of allocated neighs */ |
96 | unsigned long destroys; /* number of destroyed neighs */ | |
97 | unsigned long hash_grows; /* number of hash resizes */ | |
98 | ||
9a6d276e | 99 | unsigned long res_failed; /* number of failed resolutions */ |
1da177e4 LT |
100 | |
101 | unsigned long lookups; /* number of lookups */ | |
102 | unsigned long hits; /* number of hits (among lookups) */ | |
103 | ||
104 | unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ | |
105 | unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ | |
106 | ||
107 | unsigned long periodic_gc_runs; /* number of periodic GC runs */ | |
108 | unsigned long forced_gc_runs; /* number of forced GC runs */ | |
9a6d276e NH |
109 | |
110 | unsigned long unres_discards; /* number of unresolved drops */ | |
1da177e4 LT |
111 | }; |
112 | ||
4ea7334b | 113 | #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) |
1da177e4 | 114 | |
fd2c3ef7 | 115 | struct neighbour { |
767e97e1 | 116 | struct neighbour __rcu *next; |
1da177e4 LT |
117 | struct neigh_table *tbl; |
118 | struct neigh_parms *parms; | |
1da177e4 LT |
119 | unsigned long confirmed; |
120 | unsigned long updated; | |
46b13fc5 | 121 | rwlock_t lock; |
367e5e37 | 122 | atomic_t refcnt; |
e37ef961 | 123 | struct sk_buff_head arp_queue; |
8b5c171b | 124 | unsigned int arp_queue_len_bytes; |
e37ef961 ED |
125 | struct timer_list timer; |
126 | unsigned long used; | |
1da177e4 | 127 | atomic_t probes; |
46b13fc5 ED |
128 | __u8 flags; |
129 | __u8 nud_state; | |
130 | __u8 type; | |
131 | __u8 dead; | |
0ed8ddf4 | 132 | seqlock_t ha_lock; |
d924424a | 133 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
f6b72b62 | 134 | struct hh_cache hh; |
8f40b161 | 135 | int (*output)(struct neighbour *, struct sk_buff *); |
89d69d2b | 136 | const struct neigh_ops *ops; |
767e97e1 | 137 | struct rcu_head rcu; |
e37ef961 | 138 | struct net_device *dev; |
1da177e4 LT |
139 | u8 primary_key[0]; |
140 | }; | |
141 | ||
fd2c3ef7 | 142 | struct neigh_ops { |
1da177e4 | 143 | int family; |
8f40b161 DM |
144 | void (*solicit)(struct neighbour *, struct sk_buff *); |
145 | void (*error_report)(struct neighbour *, struct sk_buff *); | |
146 | int (*output)(struct neighbour *, struct sk_buff *); | |
147 | int (*connected_output)(struct neighbour *, struct sk_buff *); | |
1da177e4 LT |
148 | }; |
149 | ||
fd2c3ef7 | 150 | struct pneigh_entry { |
1da177e4 | 151 | struct pneigh_entry *next; |
57da52c1 | 152 | #ifdef CONFIG_NET_NS |
426b5303 | 153 | struct net *net; |
57da52c1 | 154 | #endif |
426b5303 | 155 | struct net_device *dev; |
62dd9318 | 156 | u8 flags; |
1da177e4 LT |
157 | u8 key[0]; |
158 | }; | |
159 | ||
160 | /* | |
161 | * neighbour table manipulation | |
162 | */ | |
163 | ||
2c2aba6c DM |
164 | #define NEIGH_NUM_HASH_RND 4 |
165 | ||
d6bf7817 | 166 | struct neigh_hash_table { |
767e97e1 | 167 | struct neighbour __rcu **hash_buckets; |
cd089336 | 168 | unsigned int hash_shift; |
2c2aba6c | 169 | __u32 hash_rnd[NEIGH_NUM_HASH_RND]; |
d6bf7817 ED |
170 | struct rcu_head rcu; |
171 | }; | |
172 | ||
1da177e4 | 173 | |
fd2c3ef7 | 174 | struct neigh_table { |
1da177e4 LT |
175 | struct neigh_table *next; |
176 | int family; | |
177 | int entry_size; | |
178 | int key_len; | |
d6bf7817 ED |
179 | __u32 (*hash)(const void *pkey, |
180 | const struct net_device *dev, | |
2c2aba6c | 181 | __u32 *hash_rnd); |
1da177e4 LT |
182 | int (*constructor)(struct neighbour *); |
183 | int (*pconstructor)(struct pneigh_entry *); | |
184 | void (*pdestructor)(struct pneigh_entry *); | |
185 | void (*proxy_redo)(struct sk_buff *skb); | |
186 | char *id; | |
187 | struct neigh_parms parms; | |
787a3445 | 188 | /* HACK. gc_* should follow parms without a gap! */ |
1da177e4 LT |
189 | int gc_interval; |
190 | int gc_thresh1; | |
191 | int gc_thresh2; | |
192 | int gc_thresh3; | |
193 | unsigned long last_flush; | |
e4c4e448 | 194 | struct delayed_work gc_work; |
1da177e4 LT |
195 | struct timer_list proxy_timer; |
196 | struct sk_buff_head proxy_queue; | |
197 | atomic_t entries; | |
198 | rwlock_t lock; | |
199 | unsigned long last_rand; | |
7d720c3e | 200 | struct neigh_statistics __percpu *stats; |
d6bf7817 | 201 | struct neigh_hash_table __rcu *nht; |
1da177e4 | 202 | struct pneigh_entry **phash_buckets; |
1da177e4 LT |
203 | }; |
204 | ||
1026fec8 | 205 | #define NEIGH_PRIV_ALIGN sizeof(long long) |
daaba4fa | 206 | #define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN) |
1026fec8 DM |
207 | |
208 | static inline void *neighbour_priv(const struct neighbour *n) | |
209 | { | |
08433eff | 210 | return (char *)n + n->tbl->entry_size; |
1026fec8 DM |
211 | } |
212 | ||
1da177e4 LT |
213 | /* flags for neigh_update() */ |
214 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
215 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
216 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
217 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
218 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
219 | ||
90972b22 JP |
220 | void neigh_table_init(struct neigh_table *tbl); |
221 | int neigh_table_clear(struct neigh_table *tbl); | |
222 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
223 | struct net_device *dev); | |
224 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, | |
225 | const void *pkey); | |
226 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
227 | struct net_device *dev, bool want_ref); | |
a263b309 | 228 | static inline struct neighbour *neigh_create(struct neigh_table *tbl, |
1da177e4 | 229 | const void *pkey, |
a263b309 DM |
230 | struct net_device *dev) |
231 | { | |
232 | return __neigh_create(tbl, pkey, dev, true); | |
233 | } | |
90972b22 JP |
234 | void neigh_destroy(struct neighbour *neigh); |
235 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
236 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags); | |
237 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); | |
238 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
239 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb); | |
240 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); | |
241 | int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb); | |
242 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb); | |
243 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1da177e4 LT |
244 | u8 *lladdr, void *saddr, |
245 | struct net_device *dev); | |
246 | ||
90972b22 JP |
247 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
248 | struct neigh_table *tbl); | |
249 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
57da52c1 YH |
250 | |
251 | static inline | |
90972b22 | 252 | struct net *neigh_parms_net(const struct neigh_parms *parms) |
57da52c1 | 253 | { |
e42ea986 | 254 | return read_pnet(&parms->net); |
57da52c1 YH |
255 | } |
256 | ||
90972b22 | 257 | unsigned long neigh_rand_reach_time(unsigned long base); |
1da177e4 | 258 | |
90972b22 JP |
259 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
260 | struct sk_buff *skb); | |
261 | struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
262 | const void *key, struct net_device *dev, | |
263 | int creat); | |
264 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
265 | const void *key, struct net_device *dev); | |
266 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, | |
267 | struct net_device *dev); | |
1da177e4 | 268 | |
90972b22 | 269 | static inline struct net *pneigh_net(const struct pneigh_entry *pneigh) |
57da52c1 | 270 | { |
e42ea986 | 271 | return read_pnet(&pneigh->net); |
57da52c1 YH |
272 | } |
273 | ||
90972b22 JP |
274 | void neigh_app_ns(struct neighbour *n); |
275 | void neigh_for_each(struct neigh_table *tbl, | |
276 | void (*cb)(struct neighbour *, void *), void *cookie); | |
277 | void __neigh_for_each_release(struct neigh_table *tbl, | |
278 | int (*cb)(struct neighbour *)); | |
279 | void pneigh_for_each(struct neigh_table *tbl, | |
280 | void (*cb)(struct pneigh_entry *)); | |
1da177e4 LT |
281 | |
282 | struct neigh_seq_state { | |
42508461 | 283 | struct seq_net_private p; |
1da177e4 | 284 | struct neigh_table *tbl; |
d6bf7817 | 285 | struct neigh_hash_table *nht; |
1da177e4 LT |
286 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, |
287 | struct neighbour *n, loff_t *pos); | |
288 | unsigned int bucket; | |
289 | unsigned int flags; | |
290 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
291 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
292 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
293 | }; | |
90972b22 JP |
294 | void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, |
295 | unsigned int); | |
296 | void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
297 | void neigh_seq_stop(struct seq_file *, void *); | |
298 | ||
299 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
300 | char *p_name, proc_handler *proc_handler); | |
301 | void neigh_sysctl_unregister(struct neigh_parms *p); | |
1da177e4 LT |
302 | |
303 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
304 | { | |
305 | atomic_dec(&parms->refcnt); | |
306 | } | |
307 | ||
1da177e4 LT |
308 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
309 | { | |
310 | atomic_inc(&parms->refcnt); | |
311 | return parms; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Neighbour references | |
316 | */ | |
317 | ||
318 | static inline void neigh_release(struct neighbour *neigh) | |
319 | { | |
320 | if (atomic_dec_and_test(&neigh->refcnt)) | |
321 | neigh_destroy(neigh); | |
322 | } | |
323 | ||
324 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
325 | { | |
326 | if (neigh) | |
327 | atomic_inc(&neigh->refcnt); | |
328 | return neigh; | |
329 | } | |
330 | ||
331 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
332 | ||
1da177e4 LT |
333 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
334 | { | |
ef22b7b6 | 335 | unsigned long now = jiffies; |
0ed8ddf4 ED |
336 | |
337 | if (neigh->used != now) | |
338 | neigh->used = now; | |
1da177e4 LT |
339 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
340 | return __neigh_event_send(neigh, skb); | |
341 | return 0; | |
342 | } | |
343 | ||
e179e632 BDS |
344 | #ifdef CONFIG_BRIDGE_NETFILTER |
345 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) | |
346 | { | |
95c96174 | 347 | unsigned int seq, hh_alen; |
e179e632 BDS |
348 | |
349 | do { | |
350 | seq = read_seqbegin(&hh->hh_lock); | |
351 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
352 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
353 | } while (read_seqretry(&hh->hh_lock, seq)); | |
354 | return 0; | |
355 | } | |
356 | #endif | |
357 | ||
425f09ab | 358 | static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) |
3644f0ce | 359 | { |
95c96174 | 360 | unsigned int seq; |
3644f0ce SH |
361 | int hh_len; |
362 | ||
363 | do { | |
3644f0ce SH |
364 | seq = read_seqbegin(&hh->hh_lock); |
365 | hh_len = hh->hh_len; | |
425f09ab ED |
366 | if (likely(hh_len <= HH_DATA_MOD)) { |
367 | /* this is inlined by gcc */ | |
368 | memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD); | |
369 | } else { | |
370 | int hh_alen = HH_DATA_ALIGN(hh_len); | |
371 | ||
372 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
373 | } | |
3644f0ce SH |
374 | } while (read_seqretry(&hh->hh_lock, seq)); |
375 | ||
376 | skb_push(skb, hh_len); | |
b23b5455 | 377 | return dev_queue_xmit(skb); |
3644f0ce SH |
378 | } |
379 | ||
1da177e4 LT |
380 | static inline struct neighbour * |
381 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
382 | { | |
383 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
384 | ||
385 | if (n || !creat) | |
386 | return n; | |
387 | ||
388 | n = neigh_create(tbl, pkey, dev); | |
389 | return IS_ERR(n) ? NULL : n; | |
390 | } | |
391 | ||
392 | static inline struct neighbour * | |
393 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
394 | struct net_device *dev) | |
395 | { | |
396 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
397 | ||
398 | if (n) | |
399 | return n; | |
400 | ||
401 | return neigh_create(tbl, pkey, dev); | |
402 | } | |
403 | ||
a61bbcf2 PM |
404 | struct neighbour_cb { |
405 | unsigned long sched_next; | |
406 | unsigned int flags; | |
407 | }; | |
408 | ||
409 | #define LOCALLY_ENQUEUED 0x1 | |
410 | ||
411 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 | 412 | |
0ed8ddf4 ED |
413 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
414 | const struct net_device *dev) | |
415 | { | |
416 | unsigned int seq; | |
417 | ||
418 | do { | |
419 | seq = read_seqbegin(&n->ha_lock); | |
420 | memcpy(dst, n->ha, dev->addr_len); | |
421 | } while (read_seqretry(&n->ha_lock, seq)); | |
422 | } | |
1da177e4 | 423 | #endif |