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>
28 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
29 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
30 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
36 struct net_device
*dev
;
37 struct neigh_parms
*next
;
38 int (*neigh_setup
)(struct neighbour
*);
39 void (*neigh_destructor
)(struct neighbour
*);
40 struct neigh_table
*tbl
;
46 struct rcu_head rcu_head
;
48 int base_reachable_time
;
64 struct neigh_statistics
66 unsigned long allocs
; /* number of allocated neighs */
67 unsigned long destroys
; /* number of destroyed neighs */
68 unsigned long hash_grows
; /* number of hash resizes */
70 unsigned long res_failed
; /* nomber of failed resolutions */
72 unsigned long lookups
; /* number of lookups */
73 unsigned long hits
; /* number of hits (among lookups) */
75 unsigned long rcv_probes_mcast
; /* number of received mcast ipv6 */
76 unsigned long rcv_probes_ucast
; /* number of received ucast ipv6 */
78 unsigned long periodic_gc_runs
; /* number of periodic GC runs */
79 unsigned long forced_gc_runs
; /* number of forced GC runs */
82 #define NEIGH_CACHE_STAT_INC(tbl, field) \
85 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
91 struct neighbour
*next
;
92 struct neigh_table
*tbl
;
93 struct neigh_parms
*parms
;
94 struct net_device
*dev
;
96 unsigned long confirmed
;
97 unsigned long updated
;
104 unsigned char ha
[ALIGN(MAX_ADDR_LEN
, sizeof(unsigned long))];
107 int (*output
)(struct sk_buff
*skb
);
108 struct sk_buff_head arp_queue
;
109 struct timer_list timer
;
110 struct neigh_ops
*ops
;
117 void (*solicit
)(struct neighbour
*, struct sk_buff
*);
118 void (*error_report
)(struct neighbour
*, struct sk_buff
*);
119 int (*output
)(struct sk_buff
*);
120 int (*connected_output
)(struct sk_buff
*);
121 int (*hh_output
)(struct sk_buff
*);
122 int (*queue_xmit
)(struct sk_buff
*);
127 struct pneigh_entry
*next
;
128 struct net_device
*dev
;
134 * neighbour table manipulation
140 struct neigh_table
*next
;
144 __u32 (*hash
)(const void *pkey
, const struct net_device
*);
145 int (*constructor
)(struct neighbour
*);
146 int (*pconstructor
)(struct pneigh_entry
*);
147 void (*pdestructor
)(struct pneigh_entry
*);
148 void (*proxy_redo
)(struct sk_buff
*skb
);
150 struct neigh_parms parms
;
151 /* HACK. gc_* shoul follow parms without a gap! */
156 unsigned long last_flush
;
157 struct timer_list gc_timer
;
158 struct timer_list proxy_timer
;
159 struct sk_buff_head proxy_queue
;
162 unsigned long last_rand
;
163 kmem_cache_t
*kmem_cachep
;
164 struct neigh_statistics
*stats
;
165 struct neighbour
**hash_buckets
;
166 unsigned int hash_mask
;
168 unsigned int hash_chain_gc
;
169 struct pneigh_entry
**phash_buckets
;
170 #ifdef CONFIG_PROC_FS
171 struct proc_dir_entry
*pde
;
175 /* flags for neigh_update() */
176 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001
177 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
178 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
179 #define NEIGH_UPDATE_F_ISROUTER 0x40000000
180 #define NEIGH_UPDATE_F_ADMIN 0x80000000
182 extern void neigh_table_init(struct neigh_table
*tbl
);
183 extern void neigh_table_init_no_netlink(struct neigh_table
*tbl
);
184 extern int neigh_table_clear(struct neigh_table
*tbl
);
185 extern struct neighbour
* neigh_lookup(struct neigh_table
*tbl
,
187 struct net_device
*dev
);
188 extern struct neighbour
* neigh_lookup_nodev(struct neigh_table
*tbl
,
190 extern struct neighbour
* neigh_create(struct neigh_table
*tbl
,
192 struct net_device
*dev
);
193 extern void neigh_destroy(struct neighbour
*neigh
);
194 extern int __neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
);
195 extern int neigh_update(struct neighbour
*neigh
, const u8
*lladdr
, u8
new,
197 extern void neigh_changeaddr(struct neigh_table
*tbl
, struct net_device
*dev
);
198 extern int neigh_ifdown(struct neigh_table
*tbl
, struct net_device
*dev
);
199 extern int neigh_resolve_output(struct sk_buff
*skb
);
200 extern int neigh_connected_output(struct sk_buff
*skb
);
201 extern int neigh_compat_output(struct sk_buff
*skb
);
202 extern struct neighbour
*neigh_event_ns(struct neigh_table
*tbl
,
203 u8
*lladdr
, void *saddr
,
204 struct net_device
*dev
);
206 extern struct neigh_parms
*neigh_parms_alloc(struct net_device
*dev
, struct neigh_table
*tbl
);
207 extern void neigh_parms_release(struct neigh_table
*tbl
, struct neigh_parms
*parms
);
208 extern void neigh_parms_destroy(struct neigh_parms
*parms
);
209 extern unsigned long neigh_rand_reach_time(unsigned long base
);
211 extern void pneigh_enqueue(struct neigh_table
*tbl
, struct neigh_parms
*p
,
212 struct sk_buff
*skb
);
213 extern struct pneigh_entry
*pneigh_lookup(struct neigh_table
*tbl
, const void *key
, struct net_device
*dev
, int creat
);
214 extern int pneigh_delete(struct neigh_table
*tbl
, const void *key
, struct net_device
*dev
);
216 struct netlink_callback
;
218 extern int neigh_dump_info(struct sk_buff
*skb
, struct netlink_callback
*cb
);
219 extern int neigh_add(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
220 extern int neigh_delete(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
221 extern void neigh_app_ns(struct neighbour
*n
);
223 extern int neightbl_dump_info(struct sk_buff
*skb
, struct netlink_callback
*cb
);
224 extern int neightbl_set(struct sk_buff
*skb
, struct nlmsghdr
*nlh
, void *arg
);
226 extern void neigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct neighbour
*, void *), void *cookie
);
227 extern void __neigh_for_each_release(struct neigh_table
*tbl
, int (*cb
)(struct neighbour
*));
228 extern void pneigh_for_each(struct neigh_table
*tbl
, void (*cb
)(struct pneigh_entry
*));
230 struct neigh_seq_state
{
231 struct neigh_table
*tbl
;
232 void *(*neigh_sub_iter
)(struct neigh_seq_state
*state
,
233 struct neighbour
*n
, loff_t
*pos
);
236 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
237 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
238 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
240 extern void *neigh_seq_start(struct seq_file
*, loff_t
*, struct neigh_table
*, unsigned int);
241 extern void *neigh_seq_next(struct seq_file
*, void *, loff_t
*);
242 extern void neigh_seq_stop(struct seq_file
*, void *);
244 extern int neigh_sysctl_register(struct net_device
*dev
,
245 struct neigh_parms
*p
,
246 int p_id
, int pdev_id
,
248 proc_handler
*proc_handler
,
249 ctl_handler
*strategy
);
250 extern void neigh_sysctl_unregister(struct neigh_parms
*p
);
252 static inline void __neigh_parms_put(struct neigh_parms
*parms
)
254 atomic_dec(&parms
->refcnt
);
257 static inline void neigh_parms_put(struct neigh_parms
*parms
)
259 if (atomic_dec_and_test(&parms
->refcnt
))
260 neigh_parms_destroy(parms
);
263 static inline struct neigh_parms
*neigh_parms_clone(struct neigh_parms
*parms
)
265 atomic_inc(&parms
->refcnt
);
270 * Neighbour references
273 static inline void neigh_release(struct neighbour
*neigh
)
275 if (atomic_dec_and_test(&neigh
->refcnt
))
276 neigh_destroy(neigh
);
279 static inline struct neighbour
* neigh_clone(struct neighbour
*neigh
)
282 atomic_inc(&neigh
->refcnt
);
286 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
288 static inline void neigh_confirm(struct neighbour
*neigh
)
291 neigh
->confirmed
= jiffies
;
294 static inline int neigh_is_connected(struct neighbour
*neigh
)
296 return neigh
->nud_state
&NUD_CONNECTED
;
299 static inline int neigh_is_valid(struct neighbour
*neigh
)
301 return neigh
->nud_state
&NUD_VALID
;
304 static inline int neigh_event_send(struct neighbour
*neigh
, struct sk_buff
*skb
)
306 neigh
->used
= jiffies
;
307 if (!(neigh
->nud_state
&(NUD_CONNECTED
|NUD_DELAY
|NUD_PROBE
)))
308 return __neigh_event_send(neigh
, skb
);
312 static inline struct neighbour
*
313 __neigh_lookup(struct neigh_table
*tbl
, const void *pkey
, struct net_device
*dev
, int creat
)
315 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
320 n
= neigh_create(tbl
, pkey
, dev
);
321 return IS_ERR(n
) ? NULL
: n
;
324 static inline struct neighbour
*
325 __neigh_lookup_errno(struct neigh_table
*tbl
, const void *pkey
,
326 struct net_device
*dev
)
328 struct neighbour
*n
= neigh_lookup(tbl
, pkey
, dev
);
333 return neigh_create(tbl
, pkey
, dev
);
336 struct neighbour_cb
{
337 unsigned long sched_next
;
341 #define LOCALLY_ENQUEUED 0x1
343 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)