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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 |
391 |
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