1 #ifndef _NET_NEIGHBOUR_H
2 #define _NET_NEIGHBOUR_H
4 #include <linux/neighbour.h>
7 * Generic neighbour manipulation
10 * Pedro Roque <roque@di.fc.ul.pt>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
15 * Harald Welte: <laforge@gnumonks.org>
16 * - Add neighbour cache statistics like rtstat
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>
25 #include <linux/err.h>
26 #include <linux/sysctl.h>
27 #include <net/rtnetlink.h>
30 * NUD stands for "neighbor unreachability detection"
33 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
34 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
35 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
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
;
54 struct rcu_head rcu_head
;
56 int base_reachable_time
;
72 struct neigh_statistics
74 unsigned long allocs
; /* number of allocated neighs */
75 unsigned long destroys
; /* number of destroyed neighs */
76 unsigned long hash_grows
; /* number of hash resizes */
78 unsigned long res_failed
; /* number of failed resolutions */
80 unsigned long lookups
; /* number of lookups */
81 unsigned long hits
; /* number of hits (among lookups) */
83 unsigned long rcv_probes_mcast
; /* number of received mcast ipv6 */
84 unsigned long rcv_probes_ucast
; /* number of received ucast ipv6 */
86 unsigned long periodic_gc_runs
; /* number of periodic GC runs */
87 unsigned long forced_gc_runs
; /* number of forced GC runs */
89 unsigned long unres_discards
; /* number of unresolved drops */
92 #define NEIGH_CACHE_STAT_INC(tbl, field) \
95 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
101 struct neighbour
*next
;
102 struct neigh_table
*tbl
;
103 struct neigh_parms
*parms
;
104 struct net_device
*dev
;
106 unsigned long confirmed
;
107 unsigned long updated
;
114 unsigned char ha
[ALIGN(MAX_ADDR_LEN
, sizeof(unsigned long))];
117 int (*output
)(struct sk_buff
*skb
);
118 struct sk_buff_head arp_queue
;
119 struct timer_list timer
;
120 struct neigh_ops
*ops
;
127 void (*solicit
)(struct neighbour
*, struct sk_buff
*);
128 void (*error_report
)(struct neighbour
*, struct sk_buff
*);
129 int (*output
)(struct sk_buff
*);
130 int (*connected_output
)(struct sk_buff
*);
131 int (*hh_output
)(struct sk_buff
*);
132 int (*queue_xmit
)(struct sk_buff
*);
137 struct pneigh_entry
*next
;
141 struct net_device
*dev
;
147 * neighbour table manipulation
153 struct neigh_table
*next
;
157 __u32 (*hash
)(const void *pkey
, const struct net_device
*);
158 int (*constructor
)(struct neighbour
*);
159 int (*pconstructor
)(struct pneigh_entry
*);
160 void (*pdestructor
)(struct pneigh_entry
*);
161 void (*proxy_redo
)(struct sk_buff
*skb
);
163 struct neigh_parms parms
;
164 /* HACK. gc_* shoul follow parms without a gap! */
169 unsigned long last_flush
;
170 struct timer_list gc_timer
;
171 struct timer_list proxy_timer
;
172 struct sk_buff_head proxy_queue
;
175 unsigned long last_rand
;
176 struct kmem_cache
*kmem_cachep
;
177 struct neigh_statistics
*stats
;
178 struct neighbour
**hash_buckets
;
179 unsigned int hash_mask
;
181 unsigned int hash_chain_gc
;
182 struct pneigh_entry
**phash_buckets
;
185 /* flags for neigh_update() */
186 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001
187 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
188 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
189 #define NEIGH_UPDATE_F_ISROUTER 0x40000000
190 #define NEIGH_UPDATE_F_ADMIN 0x80000000
192 extern void neigh_table_init(struct neigh_table
*tbl
);
193 extern void neigh_table_init_no_netlink(struct neigh_table
*tbl
);
194 extern int neigh_table_clear(struct neigh_table
*tbl
);
195 extern struct neighbour
* neigh_lookup(struct neigh_table
*tbl
,
197 struct net_device
*dev
);
198 extern struct neighbour
* neigh_lookup_nodev(struct neigh_table
*tbl
,
201 extern struct neighbour
* neigh_create(struct neigh_table
*tbl
,
203 struct net_device
*dev
);
204 extern void neigh_destroy(struct neighbour
*neigh
);
205 extern int __neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
);
206 extern int neigh_update(struct neighbour
*neigh
, const u8
*lladdr
, u8
new,
208 extern void neigh_changeaddr(struct neigh_table
*tbl
, struct net_device
*dev
);
209 extern int neigh_ifdown(struct neigh_table
*tbl
, struct net_device
*dev
);
210 extern int neigh_resolve_output(struct sk_buff
*skb
);
211 extern int neigh_connected_output(struct sk_buff
*skb
);
212 extern int neigh_compat_output(struct sk_buff
*skb
);
213 extern struct neighbour
*neigh_event_ns(struct neigh_table
*tbl
,
214 u8
*lladdr
, void *saddr
,
215 struct net_device
*dev
);
217 extern struct neigh_parms
*neigh_parms_alloc(struct net_device
*dev
, struct neigh_table
*tbl
);
218 extern void neigh_parms_release(struct neigh_table
*tbl
, struct neigh_parms
*parms
);
221 struct net
*neigh_parms_net(const struct neigh_parms
*parms
)
230 extern unsigned long neigh_rand_reach_time(unsigned long base
);
232 extern void pneigh_enqueue(struct neigh_table
*tbl
, struct neigh_parms
*p
,
233 struct sk_buff
*skb
);
234 extern struct pneigh_entry
*pneigh_lookup(struct neigh_table
*tbl
, struct net
*net
, const void *key
, struct net_device
*dev
, int creat
);
235 extern struct pneigh_entry
*__pneigh_lookup(struct neigh_table
*tbl
,
238 struct net_device
*dev
);
239 extern int pneigh_delete(struct neigh_table
*tbl
, struct net
*net
, const void *key
, struct net_device
*dev
);
242 struct net
*pneigh_net(const struct pneigh_entry
*pneigh
)
251 extern void neigh_app_ns(struct neighbour
*n
);
252 extern void neigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct neighbour
*, void *), void *cookie
);
253 extern void __neigh_for_each_release(struct neigh_table
*tbl
, int (*cb
)(struct neighbour
*));
254 extern void pneigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct pneigh_entry
*));
256 struct neigh_seq_state
{
257 struct seq_net_private p
;
258 struct neigh_table
*tbl
;
259 void *(*neigh_sub_iter
)(struct neigh_seq_state
*state
,
260 struct neighbour
*n
, loff_t
*pos
);
263 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
264 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
265 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
267 extern void *neigh_seq_start(struct seq_file
*, loff_t
*, struct neigh_table
*, unsigned int);
268 extern void *neigh_seq_next(struct seq_file
*, void *, loff_t
*);
269 extern void neigh_seq_stop(struct seq_file
*, void *);
271 extern int neigh_sysctl_register(struct net_device
*dev
,
272 struct neigh_parms
*p
,
273 int p_id
, int pdev_id
,
275 proc_handler
*proc_handler
,
276 ctl_handler
*strategy
);
277 extern void neigh_sysctl_unregister(struct neigh_parms
*p
);
279 static inline void __neigh_parms_put(struct neigh_parms
*parms
)
281 atomic_dec(&parms
->refcnt
);
284 static inline struct neigh_parms
*neigh_parms_clone(struct neigh_parms
*parms
)
286 atomic_inc(&parms
->refcnt
);
291 * Neighbour references
294 static inline void neigh_release(struct neighbour
*neigh
)
296 if (atomic_dec_and_test(&neigh
->refcnt
))
297 neigh_destroy(neigh
);
300 static inline struct neighbour
* neigh_clone(struct neighbour
*neigh
)
303 atomic_inc(&neigh
->refcnt
);
307 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
309 static inline void neigh_confirm(struct neighbour
*neigh
)
312 neigh
->confirmed
= jiffies
;
315 static inline int neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
)
317 neigh
->used
= jiffies
;
318 if (!(neigh
->nud_state
&(NUD_CONNECTED
|NUD_DELAY
|NUD_PROBE
)))
319 return __neigh_event_send(neigh
, skb
);
323 static inline int neigh_hh_output(struct hh_cache
*hh
, struct sk_buff
*skb
)
331 seq
= read_seqbegin(&hh
->hh_lock
);
333 hh_alen
= HH_DATA_ALIGN(hh_len
);
334 memcpy(skb
->data
- hh_alen
, hh
->hh_data
, hh_alen
);
335 } while (read_seqretry(&hh
->hh_lock
, seq
));
337 skb_push(skb
, hh_len
);
338 return hh
->hh_output(skb
);
341 static inline struct neighbour
*
342 __neigh_lookup(struct neigh_table
*tbl
, const void *pkey
, struct net_device
*dev
, int creat
)
344 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
349 n
= neigh_create(tbl
, pkey
, dev
);
350 return IS_ERR(n
) ? NULL
: n
;
353 static inline struct neighbour
*
354 __neigh_lookup_errno(struct neigh_table
*tbl
, const void *pkey
,
355 struct net_device
*dev
)
357 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
362 return neigh_create(tbl
, pkey
, dev
);
365 struct neighbour_cb
{
366 unsigned long sched_next
;
370 #define LOCALLY_ENQUEUED 0x1
372 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)