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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 | ||
1da177e4 | 19 | #include <asm/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 LT |
45 | struct neigh_parms *next; |
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 | ||
62 | int queue_len; | |
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 ED |
101 | struct sk_buff_head arp_queue; |
102 | struct timer_list timer; | |
103 | unsigned long used; | |
1da177e4 | 104 | atomic_t probes; |
46b13fc5 ED |
105 | __u8 flags; |
106 | __u8 nud_state; | |
107 | __u8 type; | |
108 | __u8 dead; | |
0ed8ddf4 | 109 | seqlock_t ha_lock; |
d924424a | 110 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
f6b72b62 | 111 | struct hh_cache hh; |
1da177e4 | 112 | int (*output)(struct sk_buff *skb); |
89d69d2b | 113 | const struct neigh_ops *ops; |
767e97e1 | 114 | struct rcu_head rcu; |
e37ef961 | 115 | struct net_device *dev; |
1da177e4 LT |
116 | u8 primary_key[0]; |
117 | }; | |
118 | ||
fd2c3ef7 | 119 | struct neigh_ops { |
1da177e4 | 120 | int family; |
1da177e4 LT |
121 | void (*solicit)(struct neighbour *, struct sk_buff*); |
122 | void (*error_report)(struct neighbour *, struct sk_buff*); | |
123 | int (*output)(struct sk_buff*); | |
124 | int (*connected_output)(struct sk_buff*); | |
1da177e4 LT |
125 | }; |
126 | ||
fd2c3ef7 | 127 | struct pneigh_entry { |
1da177e4 | 128 | struct pneigh_entry *next; |
57da52c1 | 129 | #ifdef CONFIG_NET_NS |
426b5303 | 130 | struct net *net; |
57da52c1 | 131 | #endif |
426b5303 | 132 | struct net_device *dev; |
62dd9318 | 133 | u8 flags; |
1da177e4 LT |
134 | u8 key[0]; |
135 | }; | |
136 | ||
137 | /* | |
138 | * neighbour table manipulation | |
139 | */ | |
140 | ||
d6bf7817 | 141 | struct neigh_hash_table { |
767e97e1 | 142 | struct neighbour __rcu **hash_buckets; |
cd089336 | 143 | unsigned int hash_shift; |
d6bf7817 ED |
144 | __u32 hash_rnd; |
145 | struct rcu_head rcu; | |
146 | }; | |
147 | ||
1da177e4 | 148 | |
fd2c3ef7 | 149 | struct neigh_table { |
1da177e4 LT |
150 | struct neigh_table *next; |
151 | int family; | |
152 | int entry_size; | |
153 | int key_len; | |
d6bf7817 ED |
154 | __u32 (*hash)(const void *pkey, |
155 | const struct net_device *dev, | |
156 | __u32 hash_rnd); | |
1da177e4 LT |
157 | int (*constructor)(struct neighbour *); |
158 | int (*pconstructor)(struct pneigh_entry *); | |
159 | void (*pdestructor)(struct pneigh_entry *); | |
160 | void (*proxy_redo)(struct sk_buff *skb); | |
161 | char *id; | |
162 | struct neigh_parms parms; | |
787a3445 | 163 | /* HACK. gc_* should follow parms without a gap! */ |
1da177e4 LT |
164 | int gc_interval; |
165 | int gc_thresh1; | |
166 | int gc_thresh2; | |
167 | int gc_thresh3; | |
168 | unsigned long last_flush; | |
e4c4e448 | 169 | struct delayed_work gc_work; |
1da177e4 LT |
170 | struct timer_list proxy_timer; |
171 | struct sk_buff_head proxy_queue; | |
172 | atomic_t entries; | |
173 | rwlock_t lock; | |
174 | unsigned long last_rand; | |
367e5e37 | 175 | struct kmem_cache *kmem_cachep; |
7d720c3e | 176 | struct neigh_statistics __percpu *stats; |
d6bf7817 | 177 | struct neigh_hash_table __rcu *nht; |
1da177e4 | 178 | struct pneigh_entry **phash_buckets; |
1da177e4 LT |
179 | }; |
180 | ||
181 | /* flags for neigh_update() */ | |
182 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
183 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
184 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
185 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
186 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
187 | ||
188 | extern void neigh_table_init(struct neigh_table *tbl); | |
bd89efc5 | 189 | extern void neigh_table_init_no_netlink(struct neigh_table *tbl); |
1da177e4 LT |
190 | extern int neigh_table_clear(struct neigh_table *tbl); |
191 | extern struct neighbour * neigh_lookup(struct neigh_table *tbl, | |
192 | const void *pkey, | |
193 | struct net_device *dev); | |
194 | extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, | |
426b5303 | 195 | struct net *net, |
1da177e4 LT |
196 | const void *pkey); |
197 | extern struct neighbour * neigh_create(struct neigh_table *tbl, | |
198 | const void *pkey, | |
199 | struct net_device *dev); | |
200 | extern void neigh_destroy(struct neighbour *neigh); | |
201 | extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
202 | extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
203 | u32 flags); | |
204 | extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); | |
205 | extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
206 | extern int neigh_resolve_output(struct sk_buff *skb); | |
207 | extern int neigh_connected_output(struct sk_buff *skb); | |
208 | extern int neigh_compat_output(struct sk_buff *skb); | |
209 | extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
210 | u8 *lladdr, void *saddr, | |
211 | struct net_device *dev); | |
212 | ||
213 | extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); | |
214 | extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
57da52c1 YH |
215 | |
216 | static inline | |
217 | struct net *neigh_parms_net(const struct neigh_parms *parms) | |
218 | { | |
e42ea986 | 219 | return read_pnet(&parms->net); |
57da52c1 YH |
220 | } |
221 | ||
1da177e4 LT |
222 | extern unsigned long neigh_rand_reach_time(unsigned long base); |
223 | ||
224 | extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
225 | struct sk_buff *skb); | |
426b5303 | 226 | extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat); |
fa86d322 PE |
227 | extern struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
228 | struct net *net, | |
229 | const void *key, | |
230 | struct net_device *dev); | |
426b5303 | 231 | extern int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev); |
1da177e4 | 232 | |
57da52c1 YH |
233 | static inline |
234 | struct net *pneigh_net(const struct pneigh_entry *pneigh) | |
235 | { | |
e42ea986 | 236 | return read_pnet(&pneigh->net); |
57da52c1 YH |
237 | } |
238 | ||
1da177e4 | 239 | extern void neigh_app_ns(struct neighbour *n); |
1da177e4 LT |
240 | extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); |
241 | extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); | |
242 | extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); | |
243 | ||
244 | struct neigh_seq_state { | |
42508461 | 245 | struct seq_net_private p; |
1da177e4 | 246 | struct neigh_table *tbl; |
d6bf7817 | 247 | struct neigh_hash_table *nht; |
1da177e4 LT |
248 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, |
249 | struct neighbour *n, loff_t *pos); | |
250 | unsigned int bucket; | |
251 | unsigned int flags; | |
252 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
253 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
254 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
255 | }; | |
256 | extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); | |
257 | extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
258 | extern void neigh_seq_stop(struct seq_file *, void *); | |
259 | ||
260 | extern int neigh_sysctl_register(struct net_device *dev, | |
261 | struct neigh_parms *p, | |
1da177e4 | 262 | char *p_name, |
f8572d8f | 263 | proc_handler *proc_handler); |
1da177e4 LT |
264 | extern void neigh_sysctl_unregister(struct neigh_parms *p); |
265 | ||
266 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
267 | { | |
268 | atomic_dec(&parms->refcnt); | |
269 | } | |
270 | ||
1da177e4 LT |
271 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
272 | { | |
273 | atomic_inc(&parms->refcnt); | |
274 | return parms; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Neighbour references | |
279 | */ | |
280 | ||
281 | static inline void neigh_release(struct neighbour *neigh) | |
282 | { | |
283 | if (atomic_dec_and_test(&neigh->refcnt)) | |
284 | neigh_destroy(neigh); | |
285 | } | |
286 | ||
287 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
288 | { | |
289 | if (neigh) | |
290 | atomic_inc(&neigh->refcnt); | |
291 | return neigh; | |
292 | } | |
293 | ||
294 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
295 | ||
296 | static inline void neigh_confirm(struct neighbour *neigh) | |
297 | { | |
298 | if (neigh) | |
299 | neigh->confirmed = jiffies; | |
300 | } | |
301 | ||
1da177e4 LT |
302 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
303 | { | |
ef22b7b6 | 304 | unsigned long now = jiffies; |
0ed8ddf4 ED |
305 | |
306 | if (neigh->used != now) | |
307 | neigh->used = now; | |
1da177e4 LT |
308 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
309 | return __neigh_event_send(neigh, skb); | |
310 | return 0; | |
311 | } | |
312 | ||
e179e632 BDS |
313 | #ifdef CONFIG_BRIDGE_NETFILTER |
314 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) | |
315 | { | |
316 | unsigned seq, hh_alen; | |
317 | ||
318 | do { | |
319 | seq = read_seqbegin(&hh->hh_lock); | |
320 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
321 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
322 | } while (read_seqretry(&hh->hh_lock, seq)); | |
323 | return 0; | |
324 | } | |
325 | #endif | |
326 | ||
3644f0ce SH |
327 | static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) |
328 | { | |
329 | unsigned seq; | |
330 | int hh_len; | |
331 | ||
332 | do { | |
333 | int hh_alen; | |
334 | ||
335 | seq = read_seqbegin(&hh->hh_lock); | |
336 | hh_len = hh->hh_len; | |
337 | hh_alen = HH_DATA_ALIGN(hh_len); | |
338 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
339 | } while (read_seqretry(&hh->hh_lock, seq)); | |
340 | ||
341 | skb_push(skb, hh_len); | |
b23b5455 | 342 | return dev_queue_xmit(skb); |
3644f0ce SH |
343 | } |
344 | ||
05e3aa09 DM |
345 | static inline int neigh_output(struct neighbour *n, struct sk_buff *skb) |
346 | { | |
347 | struct hh_cache *hh = &n->hh; | |
b23b5455 | 348 | if ((n->nud_state & NUD_CONNECTED) && hh->hh_len) |
05e3aa09 DM |
349 | return neigh_hh_output(hh, skb); |
350 | else | |
351 | return n->output(skb); | |
352 | } | |
353 | ||
1da177e4 LT |
354 | static inline struct neighbour * |
355 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
356 | { | |
357 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
358 | ||
359 | if (n || !creat) | |
360 | return n; | |
361 | ||
362 | n = neigh_create(tbl, pkey, dev); | |
363 | return IS_ERR(n) ? NULL : n; | |
364 | } | |
365 | ||
366 | static inline struct neighbour * | |
367 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
368 | struct net_device *dev) | |
369 | { | |
370 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
371 | ||
372 | if (n) | |
373 | return n; | |
374 | ||
375 | return neigh_create(tbl, pkey, dev); | |
376 | } | |
377 | ||
a61bbcf2 PM |
378 | struct neighbour_cb { |
379 | unsigned long sched_next; | |
380 | unsigned int flags; | |
381 | }; | |
382 | ||
383 | #define LOCALLY_ENQUEUED 0x1 | |
384 | ||
385 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 | 386 | |
0ed8ddf4 ED |
387 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
388 | const struct net_device *dev) | |
389 | { | |
390 | unsigned int seq; | |
391 | ||
392 | do { | |
393 | seq = read_seqbegin(&n->ha_lock); | |
394 | memcpy(dst, n->ha, dev->addr_len); | |
395 | } while (read_seqretry(&n->ha_lock, seq)); | |
396 | } | |
1da177e4 | 397 | #endif |