1#ifndef _NET_NEIGHBOUR_H
2#define _NET_NEIGHBOUR_H
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25#define NTF_PROXY 0x08
26#define NTF_ROUTER 0x80
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31
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
38
39
40#define NUD_NOARP 0x40
41#define NUD_PERMANENT 0x80
42#define NUD_NONE 0x00
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47
48
49#ifdef __KERNEL__
50
51#include <asm/atomic.h>
52#include <linux/skbuff.h>
53#include <linux/seq_file.h>
54
55#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE)
56#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
57#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
58
59struct neigh_parms
60{
61 struct neigh_parms *next;
62 int (*neigh_setup)(struct neighbour *);
63 struct neigh_table *tbl;
64 int entries;
65 void *priv;
66
67 void *sysctl_table;
68
69 int base_reachable_time;
70 int retrans_time;
71 int gc_staletime;
72 int reachable_time;
73 int delay_probe_time;
74
75 int queue_len;
76 int ucast_probes;
77 int app_probes;
78 int mcast_probes;
79 int anycast_delay;
80 int proxy_delay;
81 int proxy_qlen;
82 int locktime;
83};
84
85struct neigh_statistics
86{
87 unsigned long allocs;
88 unsigned long destroys;
89 unsigned long hash_grows;
90
91 unsigned long res_failed;
92
93 unsigned long lookups;
94 unsigned long hits;
95
96 unsigned long rcv_probes_mcast;
97 unsigned long rcv_probes_ucast;
98
99 unsigned long periodic_gc_runs;
100 unsigned long forced_gc_runs;
101};
102
103#define NEIGH_CACHE_STAT_INC(tbl, field) \
104 ((tbl)->stats[smp_processor_id()].field++)
105
106struct neighbour
107{
108 struct neighbour *next;
109 struct neigh_table *tbl;
110 struct neigh_parms *parms;
111 struct net_device *dev;
112 unsigned long used;
113 unsigned long confirmed;
114 unsigned long updated;
115 __u8 flags;
116 __u8 nud_state;
117 __u8 type;
118 __u8 dead;
119 atomic_t probes;
120 rwlock_t lock;
121 unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
122 struct hh_cache *hh;
123 atomic_t refcnt;
124 int (*output)(struct sk_buff *skb);
125 struct sk_buff_head arp_queue;
126 struct timer_list timer;
127 struct neigh_ops *ops;
128 u8 primary_key[0];
129};
130
131struct neigh_ops
132{
133 int family;
134 void (*destructor)(struct neighbour *);
135 void (*solicit)(struct neighbour *, struct sk_buff*);
136 void (*error_report)(struct neighbour *, struct sk_buff*);
137 int (*output)(struct sk_buff*);
138 int (*connected_output)(struct sk_buff*);
139 int (*hh_output)(struct sk_buff*);
140 int (*queue_xmit)(struct sk_buff*);
141};
142
143struct pneigh_entry
144{
145 struct pneigh_entry *next;
146 struct net_device *dev;
147 u8 key[0];
148};
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153
154
155struct neigh_table
156{
157 struct neigh_table *next;
158 int family;
159 int entry_size;
160 int key_len;
161 __u32 (*hash)(const void *pkey, const struct net_device *);
162 int (*constructor)(struct neighbour *);
163 int (*pconstructor)(struct pneigh_entry *);
164 void (*pdestructor)(struct pneigh_entry *);
165 void (*proxy_redo)(struct sk_buff *skb);
166 char *id;
167 struct neigh_parms parms;
168
169 int gc_interval;
170 int gc_thresh1;
171 int gc_thresh2;
172 int gc_thresh3;
173 unsigned long last_flush;
174 struct timer_list gc_timer;
175 struct timer_list proxy_timer;
176 struct sk_buff_head proxy_queue;
177 atomic_t entries;
178 rwlock_t lock;
179 unsigned long last_rand;
180 struct neigh_parms *parms_list;
181 kmem_cache_t *kmem_cachep;
182 struct tasklet_struct gc_task;
183 struct neigh_statistics stats[NR_CPUS];
184 struct neighbour **hash_buckets;
185 unsigned int hash_mask;
186 __u32 hash_rnd;
187 unsigned int hash_chain_gc;
188 struct pneigh_entry **phash_buckets;
189#ifdef CONFIG_PROC_FS
190 struct proc_dir_entry *pde;
191#endif
192};
193
194extern void neigh_table_init(struct neigh_table *tbl);
195extern int neigh_table_clear(struct neigh_table *tbl);
196extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
197 const void *pkey,
198 struct net_device *dev);
199extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
200 const void *pkey);
201extern struct neighbour * neigh_create(struct neigh_table *tbl,
202 const void *pkey,
203 struct net_device *dev);
204extern void neigh_destroy(struct neighbour *neigh);
205extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
206extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp);
207extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
208extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
209extern int neigh_resolve_output(struct sk_buff *skb);
210extern int neigh_connected_output(struct sk_buff *skb);
211extern int neigh_compat_output(struct sk_buff *skb);
212extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
213 u8 *lladdr, void *saddr,
214 struct net_device *dev);
215
216extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
217extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
218extern unsigned long neigh_rand_reach_time(unsigned long base);
219
220extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
221 struct sk_buff *skb);
222extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
223extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
224
225struct netlink_callback;
226struct nlmsghdr;
227extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
228extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
229extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
230extern void neigh_app_ns(struct neighbour *n);
231
232extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
233extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
234extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
235
236struct neigh_seq_state {
237 struct neigh_table *tbl;
238 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
239 struct neighbour *n, loff_t *pos);
240 unsigned int bucket;
241 unsigned int flags;
242#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
243#define NEIGH_SEQ_IS_PNEIGH 0x00000002
244#define NEIGH_SEQ_SKIP_NOARP 0x00000004
245};
246extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
247extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
248extern void neigh_seq_stop(struct seq_file *, void *);
249
250extern int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
251 int p_id, int pdev_id, char *p_name);
252extern void neigh_sysctl_unregister(struct neigh_parms *p);
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256
257
258static inline void neigh_release(struct neighbour *neigh)
259{
260 if (atomic_dec_and_test(&neigh->refcnt))
261 neigh_destroy(neigh);
262}
263
264static inline struct neighbour * neigh_clone(struct neighbour *neigh)
265{
266 if (neigh)
267 atomic_inc(&neigh->refcnt);
268 return neigh;
269}
270
271#define neigh_hold(n) atomic_inc(&(n)->refcnt)
272
273static inline void neigh_confirm(struct neighbour *neigh)
274{
275 if (neigh)
276 neigh->confirmed = jiffies;
277}
278
279static inline int neigh_is_connected(struct neighbour *neigh)
280{
281 return neigh->nud_state&NUD_CONNECTED;
282}
283
284static inline int neigh_is_valid(struct neighbour *neigh)
285{
286 return neigh->nud_state&NUD_VALID;
287}
288
289static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
290{
291 neigh->used = jiffies;
292 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
293 return __neigh_event_send(neigh, skb);
294 return 0;
295}
296
297static inline struct neighbour *
298__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
299{
300 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
301
302 if (n || !creat)
303 return n;
304
305 n = neigh_create(tbl, pkey, dev);
306 return IS_ERR(n) ? NULL : n;
307}
308
309static inline struct neighbour *
310__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
311 struct net_device *dev)
312{
313 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
314
315 if (n)
316 return n;
317
318 return neigh_create(tbl, pkey, dev);
319}
320
321#endif
322#endif
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