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>
12 /* The following flags & states are exported to user space,
13 so that they should be moved to include/linux/ directory.
17 * Neighbor Cache Entry Flags
20 #define NTF_PROXY 0x08 /* == ATF_PUBL */
21 #define NTF_ROUTER 0x80
24 * Neighbor Cache Entry States.
27 #define NUD_INCOMPLETE 0x01
28 #define NUD_REACHABLE 0x02
29 #define NUD_STALE 0x04
30 #define NUD_DELAY 0x08
31 #define NUD_PROBE 0x10
32 #define NUD_FAILED 0x20
35 #define NUD_NOARP 0x40
36 #define NUD_PERMANENT 0x80
39 /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
40 and make no address resolution or NUD.
41 NUD_PERMANENT is also cannot be deleted by garbage collectors.
46 #include <asm/atomic.h>
47 #include <linux/skbuff.h>
49 #include <linux/err.h>
50 #include <linux/sysctl.h>
52 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE)
53 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
54 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
58 struct neigh_parms *next;
59 int (*neigh_setup)(struct neighbour *);
60 struct neigh_table *tbl;
66 int base_reachable_time;
82 struct neigh_statistics
85 unsigned long res_failed;
86 unsigned long rcv_probes_mcast;
87 unsigned long rcv_probes_ucast;
92 struct neighbour *next;
93 struct neigh_table *tbl;
94 struct neigh_parms *parms;
95 struct net_device *dev;
97 unsigned long confirmed;
98 unsigned long updated;
105 unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
108 int (*output)(struct sk_buff *skb);
109 struct sk_buff_head arp_queue;
110 struct timer_list timer;
111 struct neigh_ops *ops;
118 void (*destructor)(struct neighbour *);
119 void (*solicit)(struct neighbour *, struct sk_buff*);
120 void (*error_report)(struct neighbour *, struct sk_buff*);
121 int (*output)(struct sk_buff*);
122 int (*connected_output)(struct sk_buff*);
123 int (*hh_output)(struct sk_buff*);
124 int (*queue_xmit)(struct sk_buff*);
129 struct pneigh_entry *next;
130 struct net_device *dev;
134 #define NEIGH_HASHMASK 0x1F
135 #define PNEIGH_HASHMASK 0xF
138 * neighbour table manipulation
144 struct neigh_table *next;
148 __u32 (*hash)(const void *pkey, const struct net_device *);
149 int (*constructor)(struct neighbour *);
150 int (*pconstructor)(struct pneigh_entry *);
151 void (*pdestructor)(struct pneigh_entry *);
152 void (*proxy_redo)(struct sk_buff *skb);
154 struct neigh_parms parms;
155 /* HACK. gc_* shoul follow parms without a gap! */
160 unsigned long last_flush;
161 struct timer_list gc_timer;
162 struct timer_list proxy_timer;
163 struct sk_buff_head proxy_queue;
166 unsigned long last_rand;
167 struct neigh_parms *parms_list;
168 kmem_cache_t *kmem_cachep;
169 struct neigh_statistics stats;
170 struct neighbour *hash_buckets[NEIGH_HASHMASK+1];
171 struct pneigh_entry *phash_buckets[PNEIGH_HASHMASK+1];
174 extern void neigh_table_init(struct neigh_table *tbl);
175 extern int neigh_table_clear(struct neigh_table *tbl);
176 extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
178 struct net_device *dev);
179 extern struct neighbour * neigh_create(struct neigh_table *tbl,
181 struct net_device *dev);
182 extern void neigh_destroy(struct neighbour *neigh);
183 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
184 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp);
185 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
186 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
187 extern int neigh_resolve_output(struct sk_buff *skb);
188 extern int neigh_connected_output(struct sk_buff *skb);
189 extern int neigh_compat_output(struct sk_buff *skb);
190 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
191 u8 *lladdr, void *saddr,
192 struct net_device *dev);
194 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
195 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
196 extern unsigned long neigh_rand_reach_time(unsigned long base);
198 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
199 struct sk_buff *skb);
200 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
201 extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
203 struct netlink_callback;
205 extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
206 extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
207 extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
208 extern void neigh_app_ns(struct neighbour *n);
210 extern int neigh_sysctl_register(struct net_device *dev,
211 struct neigh_parms *p,
212 int p_id, int pdev_id,
214 proc_handler *proc_handler);
215 extern void neigh_sysctl_unregister(struct neigh_parms *p);
218 * Neighbour references
221 static inline void neigh_release(struct neighbour *neigh)
223 if (atomic_dec_and_test(&neigh->refcnt))
224 neigh_destroy(neigh);
227 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
230 atomic_inc(&neigh->refcnt);
234 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
236 static inline void neigh_confirm(struct neighbour *neigh)
239 neigh->confirmed = jiffies;
242 static inline int neigh_is_connected(struct neighbour *neigh)
244 return neigh->nud_state&NUD_CONNECTED;
247 static inline int neigh_is_valid(struct neighbour *neigh)
249 return neigh->nud_state&NUD_VALID;
252 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
254 neigh->used = jiffies;
255 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
256 return __neigh_event_send(neigh, skb);
260 static inline struct neighbour *
261 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
263 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
268 n = neigh_create(tbl, pkey, dev);
269 return IS_ERR(n) ? NULL : n;
272 static inline struct neighbour *
273 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
274 struct net_device *dev)
276 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
281 return neigh_create(tbl, pkey, dev);
284 #define LOCALLY_ENQUEUED -2