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1 | #ifndef _NET_NEIGHBOUR_H | |
2 | #define _NET_NEIGHBOUR_H | |
3 | ||
4 | #include <linux/neighbour.h> | |
5 | ||
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 | ||
19 | #include <asm/atomic.h> | |
20 | #include <linux/netdevice.h> | |
21 | #include <linux/skbuff.h> | |
22 | #include <linux/rcupdate.h> | |
23 | #include <linux/seq_file.h> | |
24 | ||
25 | #include <linux/err.h> | |
26 | #include <linux/sysctl.h> | |
27 | #include <linux/workqueue.h> | |
28 | #include <net/rtnetlink.h> | |
29 | ||
30 | /* | |
31 | * NUD stands for "neighbor unreachability detection" | |
32 | */ | |
33 | ||
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 | ||
40 | struct neigh_parms { | |
41 | #ifdef CONFIG_NET_NS | |
42 | struct net *net; | |
43 | #endif | |
44 | struct net_device *dev; | |
45 | struct neigh_parms *next; | |
46 | int (*neigh_setup)(struct neighbour *); | |
47 | void (*neigh_cleanup)(struct neighbour *); | |
48 | struct neigh_table *tbl; | |
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 | ||
72 | struct neigh_statistics { | |
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 | ||
77 | unsigned long res_failed; /* number of failed resolutions */ | |
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 */ | |
87 | ||
88 | unsigned long unres_discards; /* number of unresolved drops */ | |
89 | }; | |
90 | ||
91 | #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) | |
92 | ||
93 | struct neighbour { | |
94 | struct neighbour __rcu *next; | |
95 | struct neigh_table *tbl; | |
96 | struct neigh_parms *parms; | |
97 | unsigned long confirmed; | |
98 | unsigned long updated; | |
99 | __u8 flags; | |
100 | __u8 nud_state; | |
101 | __u8 type; | |
102 | __u8 dead; | |
103 | atomic_t refcnt; | |
104 | struct sk_buff_head arp_queue; | |
105 | struct timer_list timer; | |
106 | unsigned long used; | |
107 | atomic_t probes; | |
108 | rwlock_t lock; | |
109 | seqlock_t ha_lock; | |
110 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; | |
111 | struct hh_cache *hh; | |
112 | int (*output)(struct sk_buff *skb); | |
113 | const struct neigh_ops *ops; | |
114 | struct rcu_head rcu; | |
115 | struct net_device *dev; | |
116 | u8 primary_key[0]; | |
117 | }; | |
118 | ||
119 | struct neigh_ops { | |
120 | int family; | |
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*); | |
125 | int (*hh_output)(struct sk_buff*); | |
126 | int (*queue_xmit)(struct sk_buff*); | |
127 | }; | |
128 | ||
129 | struct pneigh_entry { | |
130 | struct pneigh_entry *next; | |
131 | #ifdef CONFIG_NET_NS | |
132 | struct net *net; | |
133 | #endif | |
134 | struct net_device *dev; | |
135 | u8 flags; | |
136 | u8 key[0]; | |
137 | }; | |
138 | ||
139 | /* | |
140 | * neighbour table manipulation | |
141 | */ | |
142 | ||
143 | struct neigh_hash_table { | |
144 | struct neighbour __rcu **hash_buckets; | |
145 | unsigned int hash_mask; | |
146 | __u32 hash_rnd; | |
147 | struct rcu_head rcu; | |
148 | }; | |
149 | ||
150 | ||
151 | struct neigh_table { | |
152 | struct neigh_table *next; | |
153 | int family; | |
154 | int entry_size; | |
155 | int key_len; | |
156 | __u32 (*hash)(const void *pkey, | |
157 | const struct net_device *dev, | |
158 | __u32 hash_rnd); | |
159 | int (*constructor)(struct neighbour *); | |
160 | int (*pconstructor)(struct pneigh_entry *); | |
161 | void (*pdestructor)(struct pneigh_entry *); | |
162 | void (*proxy_redo)(struct sk_buff *skb); | |
163 | char *id; | |
164 | struct neigh_parms parms; | |
165 | /* HACK. gc_* should follow parms without a gap! */ | |
166 | int gc_interval; | |
167 | int gc_thresh1; | |
168 | int gc_thresh2; | |
169 | int gc_thresh3; | |
170 | unsigned long last_flush; | |
171 | struct delayed_work gc_work; | |
172 | struct timer_list proxy_timer; | |
173 | struct sk_buff_head proxy_queue; | |
174 | atomic_t entries; | |
175 | rwlock_t lock; | |
176 | unsigned long last_rand; | |
177 | struct kmem_cache *kmem_cachep; | |
178 | struct neigh_statistics __percpu *stats; | |
179 | struct neigh_hash_table __rcu *nht; | |
180 | struct pneigh_entry **phash_buckets; | |
181 | }; | |
182 | ||
183 | /* flags for neigh_update() */ | |
184 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
185 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
186 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
187 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
188 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
189 | ||
190 | extern void neigh_table_init(struct neigh_table *tbl); | |
191 | extern void neigh_table_init_no_netlink(struct neigh_table *tbl); | |
192 | extern int neigh_table_clear(struct neigh_table *tbl); | |
193 | extern struct neighbour * neigh_lookup(struct neigh_table *tbl, | |
194 | const void *pkey, | |
195 | struct net_device *dev); | |
196 | extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, | |
197 | struct net *net, | |
198 | const void *pkey); | |
199 | extern struct neighbour * neigh_create(struct neigh_table *tbl, | |
200 | const void *pkey, | |
201 | struct net_device *dev); | |
202 | extern void neigh_destroy(struct neighbour *neigh); | |
203 | extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
204 | extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
205 | u32 flags); | |
206 | extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); | |
207 | extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
208 | extern int neigh_resolve_output(struct sk_buff *skb); | |
209 | extern int neigh_connected_output(struct sk_buff *skb); | |
210 | extern int neigh_compat_output(struct sk_buff *skb); | |
211 | extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
212 | u8 *lladdr, void *saddr, | |
213 | struct net_device *dev); | |
214 | ||
215 | extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); | |
216 | extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
217 | ||
218 | static inline | |
219 | struct net *neigh_parms_net(const struct neigh_parms *parms) | |
220 | { | |
221 | return read_pnet(&parms->net); | |
222 | } | |
223 | ||
224 | extern unsigned long neigh_rand_reach_time(unsigned long base); | |
225 | ||
226 | extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
227 | struct sk_buff *skb); | |
228 | extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat); | |
229 | extern struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, | |
230 | struct net *net, | |
231 | const void *key, | |
232 | struct net_device *dev); | |
233 | extern int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev); | |
234 | ||
235 | static inline | |
236 | struct net *pneigh_net(const struct pneigh_entry *pneigh) | |
237 | { | |
238 | return read_pnet(&pneigh->net); | |
239 | } | |
240 | ||
241 | extern void neigh_app_ns(struct neighbour *n); | |
242 | extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); | |
243 | extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); | |
244 | extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); | |
245 | ||
246 | struct neigh_seq_state { | |
247 | struct seq_net_private p; | |
248 | struct neigh_table *tbl; | |
249 | struct neigh_hash_table *nht; | |
250 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, | |
251 | struct neighbour *n, loff_t *pos); | |
252 | unsigned int bucket; | |
253 | unsigned int flags; | |
254 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
255 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
256 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
257 | }; | |
258 | extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); | |
259 | extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
260 | extern void neigh_seq_stop(struct seq_file *, void *); | |
261 | ||
262 | extern int neigh_sysctl_register(struct net_device *dev, | |
263 | struct neigh_parms *p, | |
264 | char *p_name, | |
265 | proc_handler *proc_handler); | |
266 | extern void neigh_sysctl_unregister(struct neigh_parms *p); | |
267 | ||
268 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
269 | { | |
270 | atomic_dec(&parms->refcnt); | |
271 | } | |
272 | ||
273 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) | |
274 | { | |
275 | atomic_inc(&parms->refcnt); | |
276 | return parms; | |
277 | } | |
278 | ||
279 | /* | |
280 | * Neighbour references | |
281 | */ | |
282 | ||
283 | static inline void neigh_release(struct neighbour *neigh) | |
284 | { | |
285 | if (atomic_dec_and_test(&neigh->refcnt)) | |
286 | neigh_destroy(neigh); | |
287 | } | |
288 | ||
289 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
290 | { | |
291 | if (neigh) | |
292 | atomic_inc(&neigh->refcnt); | |
293 | return neigh; | |
294 | } | |
295 | ||
296 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
297 | ||
298 | static inline void neigh_confirm(struct neighbour *neigh) | |
299 | { | |
300 | if (neigh) | |
301 | neigh->confirmed = jiffies; | |
302 | } | |
303 | ||
304 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
305 | { | |
306 | unsigned long now = jiffies; | |
307 | ||
308 | if (neigh->used != now) | |
309 | neigh->used = now; | |
310 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) | |
311 | return __neigh_event_send(neigh, skb); | |
312 | return 0; | |
313 | } | |
314 | ||
315 | #ifdef CONFIG_BRIDGE_NETFILTER | |
316 | static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) | |
317 | { | |
318 | unsigned seq, hh_alen; | |
319 | ||
320 | do { | |
321 | seq = read_seqbegin(&hh->hh_lock); | |
322 | hh_alen = HH_DATA_ALIGN(ETH_HLEN); | |
323 | memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); | |
324 | } while (read_seqretry(&hh->hh_lock, seq)); | |
325 | return 0; | |
326 | } | |
327 | #endif | |
328 | ||
329 | static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) | |
330 | { | |
331 | unsigned seq; | |
332 | int hh_len; | |
333 | ||
334 | do { | |
335 | int hh_alen; | |
336 | ||
337 | seq = read_seqbegin(&hh->hh_lock); | |
338 | hh_len = hh->hh_len; | |
339 | hh_alen = HH_DATA_ALIGN(hh_len); | |
340 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
341 | } while (read_seqretry(&hh->hh_lock, seq)); | |
342 | ||
343 | skb_push(skb, hh_len); | |
344 | return hh->hh_output(skb); | |
345 | } | |
346 | ||
347 | static inline struct neighbour * | |
348 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
349 | { | |
350 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
351 | ||
352 | if (n || !creat) | |
353 | return n; | |
354 | ||
355 | n = neigh_create(tbl, pkey, dev); | |
356 | return IS_ERR(n) ? NULL : n; | |
357 | } | |
358 | ||
359 | static inline struct neighbour * | |
360 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
361 | struct net_device *dev) | |
362 | { | |
363 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
364 | ||
365 | if (n) | |
366 | return n; | |
367 | ||
368 | return neigh_create(tbl, pkey, dev); | |
369 | } | |
370 | ||
371 | struct neighbour_cb { | |
372 | unsigned long sched_next; | |
373 | unsigned int flags; | |
374 | }; | |
375 | ||
376 | #define LOCALLY_ENQUEUED 0x1 | |
377 | ||
378 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
379 | ||
380 | static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, | |
381 | const struct net_device *dev) | |
382 | { | |
383 | unsigned int seq; | |
384 | ||
385 | do { | |
386 | seq = read_seqbegin(&n->ha_lock); | |
387 | memcpy(dst, n->ha, dev->addr_len); | |
388 | } while (read_seqretry(&n->ha_lock, seq)); | |
389 | } | |
390 | #endif |