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git.proxmox.com Git - mirror_ubuntu-kernels.git/blob - include/net/neighbour.h
1 #ifndef _NET_NEIGHBOUR_H
2 #define _NET_NEIGHBOUR_H
5 * Generic neighbour manipulation
8 * Pedro Roque <roque@di.fc.ul.pt>
9 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
13 * Harald Welte: <laforge@gnumonks.org>
14 * - Add neighbour cache statistics like rtstat
17 /* The following flags & states are exported to user space,
18 so that they should be moved to include/linux/ directory.
22 * Neighbor Cache Entry Flags
25 #define NTF_PROXY 0x08 /* == ATF_PUBL */
26 #define NTF_ROUTER 0x80
29 * Neighbor Cache Entry States.
32 #define NUD_INCOMPLETE 0x01
33 #define NUD_REACHABLE 0x02
34 #define NUD_STALE 0x04
35 #define NUD_DELAY 0x08
36 #define NUD_PROBE 0x10
37 #define NUD_FAILED 0x20
40 #define NUD_NOARP 0x40
41 #define NUD_PERMANENT 0x80
44 /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
45 and make no address resolution or NUD.
46 NUD_PERMANENT is also cannot be deleted by garbage collectors.
51 #include <asm/atomic.h>
52 #include <linux/skbuff.h>
53 #include <linux/netdevice.h>
54 #include <linux/rcupdate.h>
55 #include <linux/seq_file.h>
57 #include <linux/err.h>
58 #include <linux/sysctl.h>
60 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
61 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
62 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
68 struct net_device
*dev
;
69 struct neigh_parms
*next
;
70 int (*neigh_setup
)(struct neighbour
*);
71 struct neigh_table
*tbl
;
79 struct rcu_head rcu_head
;
81 int base_reachable_time
;
97 struct neigh_statistics
99 unsigned long allocs
; /* number of allocated neighs */
100 unsigned long destroys
; /* number of destroyed neighs */
101 unsigned long hash_grows
; /* number of hash resizes */
103 unsigned long res_failed
; /* nomber of failed resolutions */
105 unsigned long lookups
; /* number of lookups */
106 unsigned long hits
; /* number of hits (among lookups) */
108 unsigned long rcv_probes_mcast
; /* number of received mcast ipv6 */
109 unsigned long rcv_probes_ucast
; /* number of received ucast ipv6 */
111 unsigned long periodic_gc_runs
; /* number of periodic GC runs */
112 unsigned long forced_gc_runs
; /* number of forced GC runs */
115 #define NEIGH_CACHE_STAT_INC(tbl, field) \
118 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
124 struct neighbour
*next
;
125 struct neigh_table
*tbl
;
126 struct neigh_parms
*parms
;
127 struct net_device
*dev
;
129 unsigned long confirmed
;
130 unsigned long updated
;
137 unsigned char ha
[(MAX_ADDR_LEN
+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
140 int (*output
)(struct sk_buff
*skb
);
141 struct sk_buff_head arp_queue
;
142 struct timer_list timer
;
143 struct neigh_ops
*ops
;
150 void (*destructor
)(struct neighbour
*);
151 void (*solicit
)(struct neighbour
*, struct sk_buff
*);
152 void (*error_report
)(struct neighbour
*, struct sk_buff
*);
153 int (*output
)(struct sk_buff
*);
154 int (*connected_output
)(struct sk_buff
*);
155 int (*hh_output
)(struct sk_buff
*);
156 int (*queue_xmit
)(struct sk_buff
*);
161 struct pneigh_entry
*next
;
162 struct net_device
*dev
;
167 * neighbour table manipulation
173 struct neigh_table
*next
;
177 __u32 (*hash
)(const void *pkey
, const struct net_device
*);
178 int (*constructor
)(struct neighbour
*);
179 int (*pconstructor
)(struct pneigh_entry
*);
180 void (*pdestructor
)(struct pneigh_entry
*);
181 void (*proxy_redo
)(struct sk_buff
*skb
);
183 struct neigh_parms parms
;
184 /* HACK. gc_* shoul follow parms without a gap! */
189 unsigned long last_flush
;
190 struct timer_list gc_timer
;
191 struct timer_list proxy_timer
;
192 struct sk_buff_head proxy_queue
;
195 unsigned long last_rand
;
196 struct neigh_parms
*parms_list
;
197 kmem_cache_t
*kmem_cachep
;
198 struct neigh_statistics
*stats
;
199 struct neighbour
**hash_buckets
;
200 unsigned int hash_mask
;
202 unsigned int hash_chain_gc
;
203 struct pneigh_entry
**phash_buckets
;
204 #ifdef CONFIG_PROC_FS
205 struct proc_dir_entry
*pde
;
209 /* flags for neigh_update() */
210 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001
211 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
212 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
213 #define NEIGH_UPDATE_F_ISROUTER 0x40000000
214 #define NEIGH_UPDATE_F_ADMIN 0x80000000
216 extern void neigh_table_init(struct neigh_table
*tbl
);
217 extern int neigh_table_clear(struct neigh_table
*tbl
);
218 extern struct neighbour
* neigh_lookup(struct neigh_table
*tbl
,
220 struct net_device
*dev
);
221 extern struct neighbour
* neigh_lookup_nodev(struct neigh_table
*tbl
,
223 extern struct neighbour
* neigh_create(struct neigh_table
*tbl
,
225 struct net_device
*dev
);
226 extern void neigh_destroy(struct neighbour
*neigh
);
227 extern int __neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
);
228 extern int neigh_update(struct neighbour
*neigh
, const u8
*lladdr
, u8
new,
230 extern void neigh_changeaddr(struct neigh_table
*tbl
, struct net_device
*dev
);
231 extern int neigh_ifdown(struct neigh_table
*tbl
, struct net_device
*dev
);
232 extern int neigh_resolve_output(struct sk_buff
*skb
);
233 extern int neigh_connected_output(struct sk_buff
*skb
);
234 extern int neigh_compat_output(struct sk_buff
*skb
);
235 extern struct neighbour
*neigh_event_ns(struct neigh_table
*tbl
,
236 u8
*lladdr
, void *saddr
,
237 struct net_device
*dev
);
239 extern struct neigh_parms
*neigh_parms_alloc(struct net_device
*dev
, struct neigh_table
*tbl
);
240 extern void neigh_parms_release(struct neigh_table
*tbl
, struct neigh_parms
*parms
);
241 extern void neigh_parms_destroy(struct neigh_parms
*parms
);
242 extern unsigned long neigh_rand_reach_time(unsigned long base
);
244 extern void pneigh_enqueue(struct neigh_table
*tbl
, struct neigh_parms
*p
,
245 struct sk_buff
*skb
);
246 extern struct pneigh_entry
*pneigh_lookup(struct neigh_table
*tbl
, const void *key
, struct net_device
*dev
, int creat
);
247 extern int pneigh_delete(struct neigh_table
*tbl
, const void *key
, struct net_device
*dev
);
249 struct netlink_callback
;
251 extern int neigh_dump_info(struct sk_buff
*skb
, struct netlink_callback
*cb
);
252 extern int neigh_add(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
253 extern int neigh_delete(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
254 extern void neigh_app_ns(struct neighbour
*n
);
256 extern int neightbl_dump_info(struct sk_buff
*skb
, struct netlink_callback
*cb
);
257 extern int neightbl_set(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
259 extern void neigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct neighbour
*, void *), void *cookie
);
260 extern void __neigh_for_each_release(struct neigh_table
*tbl
, int (*cb
)(struct neighbour
*));
261 extern void pneigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct pneigh_entry
*));
263 struct neigh_seq_state
{
264 struct neigh_table
*tbl
;
265 void *(*neigh_sub_iter
)(struct neigh_seq_state
*state
,
266 struct neighbour
*n
, loff_t
*pos
);
269 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
270 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
271 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
273 extern void *neigh_seq_start(struct seq_file
*, loff_t
*, struct neigh_table
*, unsigned int);
274 extern void *neigh_seq_next(struct seq_file
*, void *, loff_t
*);
275 extern void neigh_seq_stop(struct seq_file
*, void *);
277 extern int neigh_sysctl_register(struct net_device
*dev
,
278 struct neigh_parms
*p
,
279 int p_id
, int pdev_id
,
281 proc_handler
*proc_handler
,
282 ctl_handler
*strategy
);
283 extern void neigh_sysctl_unregister(struct neigh_parms
*p
);
285 static inline void __neigh_parms_put(struct neigh_parms
*parms
)
287 atomic_dec(&parms
->refcnt
);
290 static inline void neigh_parms_put(struct neigh_parms
*parms
)
292 if (atomic_dec_and_test(&parms
->refcnt
))
293 neigh_parms_destroy(parms
);
296 static inline struct neigh_parms
*neigh_parms_clone(struct neigh_parms
*parms
)
298 atomic_inc(&parms
->refcnt
);
303 * Neighbour references
306 static inline void neigh_release(struct neighbour
*neigh
)
308 if (atomic_dec_and_test(&neigh
->refcnt
))
309 neigh_destroy(neigh
);
312 static inline struct neighbour
* neigh_clone(struct neighbour
*neigh
)
315 atomic_inc(&neigh
->refcnt
);
319 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
321 static inline void neigh_confirm(struct neighbour
*neigh
)
324 neigh
->confirmed
= jiffies
;
327 static inline int neigh_is_connected(struct neighbour
*neigh
)
329 return neigh
->nud_state
&NUD_CONNECTED
;
332 static inline int neigh_is_valid(struct neighbour
*neigh
)
334 return neigh
->nud_state
&NUD_VALID
;
337 static inline int neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
)
339 neigh
->used
= jiffies
;
340 if (!(neigh
->nud_state
&(NUD_CONNECTED
|NUD_DELAY
|NUD_PROBE
)))
341 return __neigh_event_send(neigh
, skb
);
345 static inline struct neighbour
*
346 __neigh_lookup(struct neigh_table
*tbl
, const void *pkey
, struct net_device
*dev
, int creat
)
348 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
353 n
= neigh_create(tbl
, pkey
, dev
);
354 return IS_ERR(n
) ? NULL
: n
;
357 static inline struct neighbour
*
358 __neigh_lookup_errno(struct neigh_table
*tbl
, const void *pkey
,
359 struct net_device
*dev
)
361 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
366 return neigh_create(tbl
, pkey
, dev
);
369 #define LOCALLY_ENQUEUED -2