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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 | ||
fd2c3ef7 | 40 | struct neigh_parms { |
57da52c1 | 41 | #ifdef CONFIG_NET_NS |
426b5303 | 42 | struct net *net; |
57da52c1 | 43 | #endif |
c7fb64db | 44 | struct net_device *dev; |
1da177e4 | 45 | struct neigh_parms *next; |
447f2191 | 46 | int (*neigh_setup)(struct neighbour *); |
ecbb4169 | 47 | void (*neigh_cleanup)(struct neighbour *); |
1da177e4 | 48 | struct neigh_table *tbl; |
1da177e4 LT |
49 | |
50 | void *sysctl_table; | |
51 | ||
52 | int dead; | |
53 | atomic_t refcnt; | |
54 | struct rcu_head rcu_head; | |
55 | ||
56 | int base_reachable_time; | |
57 | int retrans_time; | |
58 | int gc_staletime; | |
59 | int reachable_time; | |
60 | int delay_probe_time; | |
61 | ||
8b5c171b | 62 | int queue_len_bytes; |
1da177e4 LT |
63 | int ucast_probes; |
64 | int app_probes; | |
65 | int mcast_probes; | |
66 | int anycast_delay; | |
67 | int proxy_delay; | |
68 | int proxy_qlen; | |
69 | int locktime; | |
70 | }; | |
71 | ||
fd2c3ef7 | 72 | struct neigh_statistics { |
1da177e4 LT |
73 | unsigned long allocs; /* number of allocated neighs */ |
74 | unsigned long destroys; /* number of destroyed neighs */ | |
75 | unsigned long hash_grows; /* number of hash resizes */ | |
76 | ||
9a6d276e | 77 | unsigned long res_failed; /* number of failed resolutions */ |
1da177e4 LT |
78 | |
79 | unsigned long lookups; /* number of lookups */ | |
80 | unsigned long hits; /* number of hits (among lookups) */ | |
81 | ||
82 | unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ | |
83 | unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ | |
84 | ||
85 | unsigned long periodic_gc_runs; /* number of periodic GC runs */ | |
86 | unsigned long forced_gc_runs; /* number of forced GC runs */ | |
9a6d276e NH |
87 | |
88 | unsigned long unres_discards; /* number of unresolved drops */ | |
1da177e4 LT |
89 | }; |
90 | ||
4ea7334b | 91 | #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) |
1da177e4 | 92 | |
fd2c3ef7 | 93 | struct neighbour { |
767e97e1 | 94 | struct neighbour __rcu *next; |
1da177e4 LT |
95 | struct neigh_table *tbl; |
96 | struct neigh_parms *parms; | |
1da177e4 LT |
97 | unsigned long confirmed; |
98 | unsigned long updated; | |
46b13fc5 | 99 | rwlock_t lock; |
367e5e37 | 100 | atomic_t refcnt; |
e37ef961 | 101 | struct sk_buff_head arp_queue; |
8b5c171b | 102 | unsigned int arp_queue_len_bytes; |
e37ef961 ED |
103 | struct timer_list timer; |
104 | unsigned long used; | |
1da177e4 | 105 | atomic_t probes; |
46b13fc5 ED |
106 | __u8 flags; |
107 | __u8 nud_state; | |
108 | __u8 type; | |
109 | __u8 dead; | |
0ed8ddf4 | 110 | seqlock_t ha_lock; |
d924424a | 111 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
f6b72b62 | 112 | struct hh_cache hh; |
8f40b161 | 113 | int (*output)(struct neighbour *, struct sk_buff *); |
89d69d2b | 114 | const struct neigh_ops *ops; |
767e97e1 | 115 | struct rcu_head rcu; |
e37ef961 | 116 | struct net_device *dev; |
1da177e4 LT |
117 | u8 primary_key[0]; |
118 | }; | |
119 | ||
fd2c3ef7 | 120 | struct neigh_ops { |
1da177e4 | 121 | int family; |
8f40b161 DM |
122 | void (*solicit)(struct neighbour *, struct sk_buff *); |
123 | void (*error_report)(struct neighbour *, struct sk_buff *); | |
124 | int (*output)(struct neighbour *, struct sk_buff *); | |
125 | int (*connected_output)(struct neighbour *, struct sk_buff *); | |
1da177e4 LT |
126 | }; |
127 | ||
fd2c3ef7 | 128 | struct pneigh_entry { |
1da177e4 | 129 | struct pneigh_entry *next; |
57da52c1 | 130 | #ifdef CONFIG_NET_NS |
426b5303 | 131 | struct net *net; |
57da52c1 | 132 | #endif |
426b5303 | 133 | struct net_device *dev; |
62dd9318 | 134 | u8 flags; |
1da177e4 LT |
135 | u8 key[0]; |
136 | }; | |
137 | ||
138 | /* | |
139 | * neighbour table manipulation | |
140 | */ | |
141 | ||
2c2aba6c DM |
142 | #define NEIGH_NUM_HASH_RND 4 |
143 | ||
d6bf7817 | 144 | struct neigh_hash_table { |
767e97e1 | 145 | struct neighbour __rcu **hash_buckets; |
cd089336 | 146 | unsigned int hash_shift; |
2c2aba6c | 147 | __u32 hash_rnd[NEIGH_NUM_HASH_RND]; |
d6bf7817 ED |
148 | struct rcu_head rcu; |
149 | }; | |
150 | ||
1da177e4 | 151 | |
fd2c3ef7 | 152 | struct neigh_table { |
1da177e4 LT |
153 | struct neigh_table *next; |
154 | int family; | |
155 | int entry_size; | |
156 | int key_len; | |
d6bf7817 ED |
157 | __u32 (*hash)(const void *pkey, |
158 | const struct net_device *dev, | |
2c2aba6c | 159 | __u32 *hash_rnd); |
1da177e4 LT |
160 | int (*constructor)(struct neighbour *); |
161 | int (*pconstructor)(struct pneigh_entry *); | |
162 | void (*pdestructor)(struct pneigh_entry *); | |
163 | void (*proxy_redo)(struct sk_buff *skb); | |
164 | char *id; | |
165 | struct neigh_parms parms; | |
787a3445 | 166 | /* HACK. gc_* should follow parms without a gap! */ |
1da177e4 LT |
167 | int gc_interval; |
168 | int gc_thresh1; | |
169 | int gc_thresh2; | |
170 | int gc_thresh3; | |
171 | unsigned long last_flush; | |
e4c4e448 | 172 | struct delayed_work gc_work; |
1da177e4 LT |
173 | struct timer_list proxy_timer; |
174 | struct sk_buff_head proxy_queue; | |
175 | atomic_t entries; | |
176 | rwlock_t lock; | |
177 | unsigned long last_rand; | |
7d720c3e | 178 | struct neigh_statistics __percpu *stats; |
d6bf7817 | 179 | struct neigh_hash_table __rcu *nht; |
1da177e4 | 180 | struct pneigh_entry **phash_buckets; |
1da177e4 LT |
181 | }; |
182 | ||
1026fec8 | 183 | #define NEIGH_PRIV_ALIGN sizeof(long long) |
daaba4fa | 184 | #define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN) |
1026fec8 DM |
185 | |
186 | static inline void *neighbour_priv(const struct neighbour *n) | |
187 | { | |
08433eff | 188 | return (char *)n + n->tbl->entry_size; |
1026fec8 DM |
189 | } |
190 | ||
1da177e4 LT |
191 | /* flags for neigh_update() */ |
192 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
193 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
194 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
195 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
196 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
197 | ||
90972b22 JP |
198 | void neigh_table_init(struct neigh_table *tbl); |
199 | int neigh_table_clear(struct neigh_table *tbl); | |
200 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
201 | struct net_device *dev); | |
202 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, | |
203 | const void *pkey); | |
204 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
205 | struct net_device *dev, bool want_ref); | |
a263b309 | 206 | static inline struct neighbour *neigh_create(struct neigh_table *tbl, |
1da177e4 | 207 | const void *pkey, |
a263b309 DM |
208 | struct net_device *dev) |
209 | { | |
210 | return __neigh_create(tbl, pkey, dev, true); | |
211 | } | |
90972b22 JP |
212 | void neigh_destroy(struct neighbour *neigh); |
213 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
214 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags); | |
215 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); | |
216 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
217 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb); | |
218 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); | |
219 | int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb); | |
220 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb); | |
221 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1da177e4 LT |
222 | u8 *lladdr, void *saddr, |
223 | struct net_device *dev); | |
224 | ||
90972b22 JP |
225 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
226 | struct neigh_table *tbl); | |
227 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
57da52c1 YH |
228 | |
229 | static inline | |
90972b22 | 230 | struct net *neigh_parms_net(const struct neigh_parms *parms) |
57da52c1 | 231 | { |
e42ea986 | 232 | return read_pnet(&parms->net); |
57da52c1 YH |
233 | } |
234 | ||
90972b22 | 235 | unsigned long neigh_rand_reach_time(unsigned long base); |
1da177e4 | 236 | |
90972b22 JP |
237 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
238 | struct sk_buff *skb); | |
239 | struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
240 | const void *key, struct net_device *dev, | |
241 | int creat); | |
242 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
243 | const void *key, struct net_device *dev); | |
244 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, | |
245 | struct net_device *dev); | |
1da177e4 | 246 | |
90972b22 | 247 | static inline struct net *pneigh_net(const struct pneigh_entry *pneigh) |
57da52c1 | 248 | { |
e42ea986 | 249 | return read_pnet(&pneigh->net); |
57da52c1 YH |
250 | } |
251 | ||
90972b22 JP |
252 | void neigh_app_ns(struct neighbour *n); |
253 | void neigh_for_each(struct neigh_table *tbl, | |
254 | void (*cb)(struct neighbour *, void *), void *cookie); | |
255 | void __neigh_for_each_release(struct neigh_table *tbl, | |
256 | int (*cb)(struct neighbour *)); | |
257 | void pneigh_for_each(struct neigh_table *tbl, | |
258 | void (*cb)(struct pneigh_entry *)); | |
1da177e4 LT |
259 | |
260 | struct neigh_seq_state { | |
42508461 | 261 | struct seq_net_private p; |
1da177e4 | 262 | struct neigh_table *tbl; |
d6bf7817 | 263 | struct neigh_hash_table *nht; |
1da177e4 LT |
264 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, |
265 | struct neighbour *n, loff_t *pos); | |
266 | unsigned int bucket; | |
267 | unsigned int flags; | |
268 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
269 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
270 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
271 | }; | |
90972b22 JP |
272 | void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, |
273 | unsigned int); | |
274 | void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
275 | void neigh_seq_stop(struct seq_file *, void *); | |
276 | ||
277 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, | |
278 | char *p_name, proc_handler *proc_handler); | |
279 | void neigh_sysctl_unregister(struct neigh_parms *p); | |
1da177e4 LT |
280 | |
281 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
282 | { | |
283 | atomic_dec(&parms->refcnt); | |
284 | } | |
285 | ||
1da177e4 LT |
286 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
287 | { | |
288 | atomic_inc(&parms->refcnt); | |
289 | return parms; | |
290 | } | |
291 | ||
292 | /* | |
293 | * Neighbour references | |
294 | */ | |
295 | ||
296 | static inline void neigh_release(struct neighbour *neigh) | |
297 | { | |
298 | if (atomic_dec_and_test(&neigh->refcnt)) | |
299 | neigh_destroy(neigh); | |
300 | } | |
301 | ||
302 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
303 | { | |
304 | if (neigh) | |
305 | atomic_inc(&neigh->refcnt); | |
306 | return neigh; | |
307 | } | |
308 | ||
309 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
310 | ||
1da177e4 LT |
311 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
312 | { | |
ef22b7b6 | 313 | unsigned long now = jiffies; |
0ed8ddf4 ED |
314 | |
315 | if (neigh->used != now) | |
316 | neigh->used = now; | |
1da177e4 LT |
317 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
318 | return __neigh_event_send(neigh, skb); | |
319 | return 0; | |
320 | } | |
321 | ||
e179e632 BDS |
322 | #ifdef CONFIG_BRIDGE_NETFILTER |
323 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) | |
324 | { | |
95c96174 | 325 | unsigned int seq, hh_alen; |
e179e632 BDS |
326 | |
327 | do { | |
328 | seq = read_seqbegin(&hh->hh_lock); | |
329 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
330 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
331 | } while (read_seqretry(&hh->hh_lock, seq)); | |
332 | return 0; | |
333 | } | |
334 | #endif | |
335 | ||
425f09ab | 336 | static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) |
3644f0ce | 337 | { |
95c96174 | 338 | unsigned int seq; |
3644f0ce SH |
339 | int hh_len; |
340 | ||
341 | do { | |
3644f0ce SH |
342 | seq = read_seqbegin(&hh->hh_lock); |
343 | hh_len = hh->hh_len; | |
425f09ab ED |
344 | if (likely(hh_len <= HH_DATA_MOD)) { |
345 | /* this is inlined by gcc */ | |
346 | memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD); | |
347 | } else { | |
348 | int hh_alen = HH_DATA_ALIGN(hh_len); | |
349 | ||
350 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
351 | } | |
3644f0ce SH |
352 | } while (read_seqretry(&hh->hh_lock, seq)); |
353 | ||
354 | skb_push(skb, hh_len); | |
b23b5455 | 355 | return dev_queue_xmit(skb); |
3644f0ce SH |
356 | } |
357 | ||
1da177e4 LT |
358 | static inline struct neighbour * |
359 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
360 | { | |
361 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
362 | ||
363 | if (n || !creat) | |
364 | return n; | |
365 | ||
366 | n = neigh_create(tbl, pkey, dev); | |
367 | return IS_ERR(n) ? NULL : n; | |
368 | } | |
369 | ||
370 | static inline struct neighbour * | |
371 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
372 | struct net_device *dev) | |
373 | { | |
374 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
375 | ||
376 | if (n) | |
377 | return n; | |
378 | ||
379 | return neigh_create(tbl, pkey, dev); | |
380 | } | |
381 | ||
a61bbcf2 PM |
382 | struct neighbour_cb { |
383 | unsigned long sched_next; | |
384 | unsigned int flags; | |
385 | }; | |
386 | ||
387 | #define LOCALLY_ENQUEUED 0x1 | |
388 | ||
389 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 | 390 | |
0ed8ddf4 ED |
391 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
392 | const struct net_device *dev) | |
393 | { | |
394 | unsigned int seq; | |
395 | ||
396 | do { | |
397 | seq = read_seqbegin(&n->ha_lock); | |
398 | memcpy(dst, n->ha, dev->addr_len); | |
399 | } while (read_seqretry(&n->ha_lock, seq)); | |
400 | } | |
1da177e4 | 401 | #endif |