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, | |
45 | NEIGH_VAR_RETRANS_TIME, | |
46 | NEIGH_VAR_BASE_REACHABLE_TIME, | |
47 | NEIGH_VAR_DELAY_PROBE_TIME, | |
48 | NEIGH_VAR_GC_STALETIME, | |
49 | NEIGH_VAR_QUEUE_LEN_BYTES, | |
50 | NEIGH_VAR_PROXY_QLEN, | |
51 | NEIGH_VAR_ANYCAST_DELAY, | |
52 | NEIGH_VAR_PROXY_DELAY, | |
53 | NEIGH_VAR_LOCKTIME, | |
54 | #define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1) | |
55 | /* Following are used as a second way to access one of the above */ | |
56 | NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */ | |
57 | NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */ | |
58 | NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */ | |
59 | /* Following are used by "default" only */ | |
60 | NEIGH_VAR_GC_INTERVAL, | |
61 | NEIGH_VAR_GC_THRESH1, | |
62 | NEIGH_VAR_GC_THRESH2, | |
63 | NEIGH_VAR_GC_THRESH3, | |
64 | NEIGH_VAR_MAX | |
65 | }; | |
66 | ||
fd2c3ef7 | 67 | struct neigh_parms { |
57da52c1 | 68 | #ifdef CONFIG_NET_NS |
426b5303 | 69 | struct net *net; |
57da52c1 | 70 | #endif |
c7fb64db | 71 | struct net_device *dev; |
1da177e4 | 72 | struct neigh_parms *next; |
447f2191 | 73 | int (*neigh_setup)(struct neighbour *); |
ecbb4169 | 74 | void (*neigh_cleanup)(struct neighbour *); |
1da177e4 | 75 | struct neigh_table *tbl; |
1da177e4 LT |
76 | |
77 | void *sysctl_table; | |
78 | ||
79 | int dead; | |
80 | atomic_t refcnt; | |
81 | struct rcu_head rcu_head; | |
82 | ||
1da177e4 | 83 | int reachable_time; |
1f9248e5 | 84 | int data[NEIGH_VAR_DATA_MAX]; |
1d4c8c29 | 85 | DECLARE_BITMAP(data_state, NEIGH_VAR_DATA_MAX); |
1da177e4 LT |
86 | }; |
87 | ||
1f9248e5 JP |
88 | static inline void neigh_var_set(struct neigh_parms *p, int index, int val) |
89 | { | |
1d4c8c29 | 90 | set_bit(index, p->data_state); |
1f9248e5 JP |
91 | p->data[index] = val; |
92 | } | |
93 | ||
94 | #define NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr]) | |
89740ca7 JP |
95 | |
96 | /* In ndo_neigh_setup, NEIGH_VAR_INIT should be used. | |
97 | * In other cases, NEIGH_VAR_SET should be used. | |
98 | */ | |
99 | #define NEIGH_VAR_INIT(p, attr, val) (NEIGH_VAR(p, attr) = val) | |
1f9248e5 JP |
100 | #define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val) |
101 | ||
1d4c8c29 JP |
102 | static inline void neigh_parms_data_state_setall(struct neigh_parms *p) |
103 | { | |
104 | bitmap_fill(p->data_state, NEIGH_VAR_DATA_MAX); | |
105 | } | |
106 | ||
107 | static inline void neigh_parms_data_state_cleanall(struct neigh_parms *p) | |
108 | { | |
109 | bitmap_zero(p->data_state, NEIGH_VAR_DATA_MAX); | |
110 | } | |
111 | ||
fd2c3ef7 | 112 | struct neigh_statistics { |
1da177e4 LT |
113 | unsigned long allocs; /* number of allocated neighs */ |
114 | unsigned long destroys; /* number of destroyed neighs */ | |
115 | unsigned long hash_grows; /* number of hash resizes */ | |
116 | ||
9a6d276e | 117 | unsigned long res_failed; /* number of failed resolutions */ |
1da177e4 LT |
118 | |
119 | unsigned long lookups; /* number of lookups */ | |
120 | unsigned long hits; /* number of hits (among lookups) */ | |
121 | ||
122 | unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ | |
123 | unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ | |
124 | ||
125 | unsigned long periodic_gc_runs; /* number of periodic GC runs */ | |
126 | unsigned long forced_gc_runs; /* number of forced GC runs */ | |
9a6d276e NH |
127 | |
128 | unsigned long unres_discards; /* number of unresolved drops */ | |
1da177e4 LT |
129 | }; |
130 | ||
4ea7334b | 131 | #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) |
1da177e4 | 132 | |
fd2c3ef7 | 133 | struct neighbour { |
767e97e1 | 134 | struct neighbour __rcu *next; |
1da177e4 LT |
135 | struct neigh_table *tbl; |
136 | struct neigh_parms *parms; | |
1da177e4 LT |
137 | unsigned long confirmed; |
138 | unsigned long updated; | |
46b13fc5 | 139 | rwlock_t lock; |
367e5e37 | 140 | atomic_t refcnt; |
e37ef961 | 141 | struct sk_buff_head arp_queue; |
8b5c171b | 142 | unsigned int arp_queue_len_bytes; |
e37ef961 ED |
143 | struct timer_list timer; |
144 | unsigned long used; | |
1da177e4 | 145 | atomic_t probes; |
46b13fc5 ED |
146 | __u8 flags; |
147 | __u8 nud_state; | |
148 | __u8 type; | |
149 | __u8 dead; | |
0ed8ddf4 | 150 | seqlock_t ha_lock; |
d924424a | 151 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
f6b72b62 | 152 | struct hh_cache hh; |
8f40b161 | 153 | int (*output)(struct neighbour *, struct sk_buff *); |
89d69d2b | 154 | const struct neigh_ops *ops; |
767e97e1 | 155 | struct rcu_head rcu; |
e37ef961 | 156 | struct net_device *dev; |
1da177e4 LT |
157 | u8 primary_key[0]; |
158 | }; | |
159 | ||
fd2c3ef7 | 160 | struct neigh_ops { |
1da177e4 | 161 | int family; |
8f40b161 DM |
162 | void (*solicit)(struct neighbour *, struct sk_buff *); |
163 | void (*error_report)(struct neighbour *, struct sk_buff *); | |
164 | int (*output)(struct neighbour *, struct sk_buff *); | |
165 | int (*connected_output)(struct neighbour *, struct sk_buff *); | |
1da177e4 LT |
166 | }; |
167 | ||
fd2c3ef7 | 168 | struct pneigh_entry { |
1da177e4 | 169 | struct pneigh_entry *next; |
57da52c1 | 170 | #ifdef CONFIG_NET_NS |
426b5303 | 171 | struct net *net; |
57da52c1 | 172 | #endif |
426b5303 | 173 | struct net_device *dev; |
62dd9318 | 174 | u8 flags; |
1da177e4 LT |
175 | u8 key[0]; |
176 | }; | |
177 | ||
178 | /* | |
179 | * neighbour table manipulation | |
180 | */ | |
181 | ||
2c2aba6c DM |
182 | #define NEIGH_NUM_HASH_RND 4 |
183 | ||
d6bf7817 | 184 | struct neigh_hash_table { |
767e97e1 | 185 | struct neighbour __rcu **hash_buckets; |
cd089336 | 186 | unsigned int hash_shift; |
2c2aba6c | 187 | __u32 hash_rnd[NEIGH_NUM_HASH_RND]; |
d6bf7817 ED |
188 | struct rcu_head rcu; |
189 | }; | |
190 | ||
1da177e4 | 191 | |
fd2c3ef7 | 192 | struct neigh_table { |
1da177e4 LT |
193 | struct neigh_table *next; |
194 | int family; | |
195 | int entry_size; | |
196 | int key_len; | |
d6bf7817 ED |
197 | __u32 (*hash)(const void *pkey, |
198 | const struct net_device *dev, | |
2c2aba6c | 199 | __u32 *hash_rnd); |
1da177e4 LT |
200 | int (*constructor)(struct neighbour *); |
201 | int (*pconstructor)(struct pneigh_entry *); | |
202 | void (*pdestructor)(struct pneigh_entry *); | |
203 | void (*proxy_redo)(struct sk_buff *skb); | |
204 | char *id; | |
205 | struct neigh_parms parms; | |
1da177e4 LT |
206 | int gc_interval; |
207 | int gc_thresh1; | |
208 | int gc_thresh2; | |
209 | int gc_thresh3; | |
210 | unsigned long last_flush; | |
e4c4e448 | 211 | struct delayed_work gc_work; |
1da177e4 LT |
212 | struct timer_list proxy_timer; |
213 | struct sk_buff_head proxy_queue; | |
214 | atomic_t entries; | |
215 | rwlock_t lock; | |
216 | unsigned long last_rand; | |
7d720c3e | 217 | struct neigh_statistics __percpu *stats; |
d6bf7817 | 218 | struct neigh_hash_table __rcu *nht; |
1da177e4 | 219 | struct pneigh_entry **phash_buckets; |
1da177e4 LT |
220 | }; |
221 | ||
73af614a JP |
222 | static inline int neigh_parms_family(struct neigh_parms *p) |
223 | { | |
224 | return p->tbl->family; | |
225 | } | |
226 | ||
1026fec8 | 227 | #define NEIGH_PRIV_ALIGN sizeof(long long) |
daaba4fa | 228 | #define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN) |
1026fec8 DM |
229 | |
230 | static inline void *neighbour_priv(const struct neighbour *n) | |
231 | { | |
08433eff | 232 | return (char *)n + n->tbl->entry_size; |
1026fec8 DM |
233 | } |
234 | ||
1da177e4 LT |
235 | /* flags for neigh_update() */ |
236 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
237 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
238 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
239 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
240 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
241 | ||
90972b22 JP |
242 | void neigh_table_init(struct neigh_table *tbl); |
243 | int neigh_table_clear(struct neigh_table *tbl); | |
244 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, | |
245 | struct net_device *dev); | |
246 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, | |
247 | const void *pkey); | |
248 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, | |
249 | struct net_device *dev, bool want_ref); | |
a263b309 | 250 | static inline struct neighbour *neigh_create(struct neigh_table *tbl, |
1da177e4 | 251 | const void *pkey, |
a263b309 DM |
252 | struct net_device *dev) |
253 | { | |
254 | return __neigh_create(tbl, pkey, dev, true); | |
255 | } | |
90972b22 JP |
256 | void neigh_destroy(struct neighbour *neigh); |
257 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
258 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags); | |
7e980569 | 259 | void __neigh_set_probe_once(struct neighbour *neigh); |
90972b22 JP |
260 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); |
261 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
262 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb); | |
263 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); | |
264 | int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb); | |
265 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb); | |
266 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
1da177e4 LT |
267 | u8 *lladdr, void *saddr, |
268 | struct net_device *dev); | |
269 | ||
90972b22 JP |
270 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
271 | struct neigh_table *tbl); | |
272 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
57da52c1 YH |
273 | |
274 | static inline | |
90972b22 | 275 | struct net *neigh_parms_net(const struct neigh_parms *parms) |
57da52c1 | 276 | { |
e42ea986 | 277 | return read_pnet(&parms->net); |
57da52c1 YH |
278 | } |
279 | ||
90972b22 | 280 | unsigned long neigh_rand_reach_time(unsigned long base); |
1da177e4 | 281 | |
90972b22 JP |
282 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
283 | struct sk_buff *skb); | |
284 | struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
285 | const void *key, struct net_device *dev, | |
286 | int creat); | |
287 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net, | |
288 | const void *key, struct net_device *dev); | |
289 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, | |
290 | struct net_device *dev); | |
1da177e4 | 291 | |
90972b22 | 292 | static inline struct net *pneigh_net(const struct pneigh_entry *pneigh) |
57da52c1 | 293 | { |
e42ea986 | 294 | return read_pnet(&pneigh->net); |
57da52c1 YH |
295 | } |
296 | ||
90972b22 JP |
297 | void neigh_app_ns(struct neighbour *n); |
298 | void neigh_for_each(struct neigh_table *tbl, | |
299 | void (*cb)(struct neighbour *, void *), void *cookie); | |
300 | void __neigh_for_each_release(struct neigh_table *tbl, | |
301 | int (*cb)(struct neighbour *)); | |
302 | void pneigh_for_each(struct neigh_table *tbl, | |
303 | void (*cb)(struct pneigh_entry *)); | |
1da177e4 LT |
304 | |
305 | struct neigh_seq_state { | |
42508461 | 306 | struct seq_net_private p; |
1da177e4 | 307 | struct neigh_table *tbl; |
d6bf7817 | 308 | struct neigh_hash_table *nht; |
1da177e4 LT |
309 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, |
310 | struct neighbour *n, loff_t *pos); | |
311 | unsigned int bucket; | |
312 | unsigned int flags; | |
313 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
314 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
315 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
316 | }; | |
90972b22 JP |
317 | void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, |
318 | unsigned int); | |
319 | void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
320 | void neigh_seq_stop(struct seq_file *, void *); | |
321 | ||
cb5b09c1 JP |
322 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
323 | void __user *buffer, size_t *lenp, loff_t *ppos); | |
324 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, | |
325 | void __user *buffer, | |
326 | size_t *lenp, loff_t *ppos); | |
327 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, | |
328 | void __user *buffer, | |
329 | size_t *lenp, loff_t *ppos); | |
330 | ||
90972b22 | 331 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, |
73af614a | 332 | proc_handler *proc_handler); |
90972b22 | 333 | void neigh_sysctl_unregister(struct neigh_parms *p); |
1da177e4 LT |
334 | |
335 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
336 | { | |
337 | atomic_dec(&parms->refcnt); | |
338 | } | |
339 | ||
1da177e4 LT |
340 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
341 | { | |
342 | atomic_inc(&parms->refcnt); | |
343 | return parms; | |
344 | } | |
345 | ||
346 | /* | |
347 | * Neighbour references | |
348 | */ | |
349 | ||
350 | static inline void neigh_release(struct neighbour *neigh) | |
351 | { | |
352 | if (atomic_dec_and_test(&neigh->refcnt)) | |
353 | neigh_destroy(neigh); | |
354 | } | |
355 | ||
356 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
357 | { | |
358 | if (neigh) | |
359 | atomic_inc(&neigh->refcnt); | |
360 | return neigh; | |
361 | } | |
362 | ||
363 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
364 | ||
1da177e4 LT |
365 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
366 | { | |
ef22b7b6 | 367 | unsigned long now = jiffies; |
0ed8ddf4 ED |
368 | |
369 | if (neigh->used != now) | |
370 | neigh->used = now; | |
1da177e4 LT |
371 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
372 | return __neigh_event_send(neigh, skb); | |
373 | return 0; | |
374 | } | |
375 | ||
e179e632 BDS |
376 | #ifdef CONFIG_BRIDGE_NETFILTER |
377 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) | |
378 | { | |
95c96174 | 379 | unsigned int seq, hh_alen; |
e179e632 BDS |
380 | |
381 | do { | |
382 | seq = read_seqbegin(&hh->hh_lock); | |
383 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
384 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
385 | } while (read_seqretry(&hh->hh_lock, seq)); | |
386 | return 0; | |
387 | } | |
388 | #endif | |
389 | ||
425f09ab | 390 | static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb) |
3644f0ce | 391 | { |
95c96174 | 392 | unsigned int seq; |
3644f0ce SH |
393 | int hh_len; |
394 | ||
395 | do { | |
3644f0ce SH |
396 | seq = read_seqbegin(&hh->hh_lock); |
397 | hh_len = hh->hh_len; | |
425f09ab ED |
398 | if (likely(hh_len <= HH_DATA_MOD)) { |
399 | /* this is inlined by gcc */ | |
400 | memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD); | |
401 | } else { | |
402 | int hh_alen = HH_DATA_ALIGN(hh_len); | |
403 | ||
404 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
405 | } | |
3644f0ce SH |
406 | } while (read_seqretry(&hh->hh_lock, seq)); |
407 | ||
408 | skb_push(skb, hh_len); | |
b23b5455 | 409 | return dev_queue_xmit(skb); |
3644f0ce SH |
410 | } |
411 | ||
1da177e4 LT |
412 | static inline struct neighbour * |
413 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
414 | { | |
415 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
416 | ||
417 | if (n || !creat) | |
418 | return n; | |
419 | ||
420 | n = neigh_create(tbl, pkey, dev); | |
421 | return IS_ERR(n) ? NULL : n; | |
422 | } | |
423 | ||
424 | static inline struct neighbour * | |
425 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
426 | struct net_device *dev) | |
427 | { | |
428 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
429 | ||
430 | if (n) | |
431 | return n; | |
432 | ||
433 | return neigh_create(tbl, pkey, dev); | |
434 | } | |
435 | ||
a61bbcf2 PM |
436 | struct neighbour_cb { |
437 | unsigned long sched_next; | |
438 | unsigned int flags; | |
439 | }; | |
440 | ||
441 | #define LOCALLY_ENQUEUED 0x1 | |
442 | ||
443 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 | 444 | |
0ed8ddf4 ED |
445 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
446 | const struct net_device *dev) | |
447 | { | |
448 | unsigned int seq; | |
449 | ||
450 | do { | |
451 | seq = read_seqbegin(&n->ha_lock); | |
452 | memcpy(dst, n->ha, dev->addr_len); | |
453 | } while (read_seqretry(&n->ha_lock, seq)); | |
454 | } | |
1da177e4 | 455 | #endif |