1#ifndef _NET_NEIGHBOUR_H
2#define _NET_NEIGHBOUR_H
3
4#include <linux/neighbour.h>
5
6
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17
18
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>
24
25#include <linux/err.h>
26#include <linux/sysctl.h>
27#include <net/rtnetlink.h>
28
29#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
30#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
31#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
32
33struct neighbour;
34
35struct neigh_parms
36{
37 struct net_device *dev;
38 struct neigh_parms *next;
39 int (*neigh_setup)(struct neighbour *);
40 void (*neigh_cleanup)(struct neighbour *);
41 struct neigh_table *tbl;
42
43 void *sysctl_table;
44
45 int dead;
46 atomic_t refcnt;
47 struct rcu_head rcu_head;
48
49 int base_reachable_time;
50 int retrans_time;
51 int gc_staletime;
52 int reachable_time;
53 int delay_probe_time;
54
55 int queue_len;
56 int ucast_probes;
57 int app_probes;
58 int mcast_probes;
59 int anycast_delay;
60 int proxy_delay;
61 int proxy_qlen;
62 int locktime;
63};
64
65struct neigh_statistics
66{
67 unsigned long allocs;
68 unsigned long destroys;
69 unsigned long hash_grows;
70
71 unsigned long res_failed;
72
73 unsigned long lookups;
74 unsigned long hits;
75
76 unsigned long rcv_probes_mcast;
77 unsigned long rcv_probes_ucast;
78
79 unsigned long periodic_gc_runs;
80 unsigned long forced_gc_runs;
81};
82
83#define NEIGH_CACHE_STAT_INC(tbl, field) \
84 do { \
85 preempt_disable(); \
86 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
87 preempt_enable(); \
88 } while (0)
89
90struct neighbour
91{
92 struct neighbour *next;
93 struct neigh_table *tbl;
94 struct neigh_parms *parms;
95 struct net_device *dev;
96 unsigned long used;
97 unsigned long confirmed;
98 unsigned long updated;
99 __u8 flags;
100 __u8 nud_state;
101 __u8 type;
102 __u8 dead;
103 atomic_t probes;
104 rwlock_t lock;
105 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
106 struct hh_cache *hh;
107 atomic_t refcnt;
108 int (*output)(struct sk_buff *skb);
109 struct sk_buff_head arp_queue;
110 struct timer_list timer;
111 struct neigh_ops *ops;
112 u8 primary_key[0];
113};
114
115struct neigh_ops
116{
117 int family;
118 void (*solicit)(struct neighbour *, struct sk_buff*);
119 void (*error_report)(struct neighbour *, struct sk_buff*);
120 int (*output)(struct sk_buff*);
121 int (*connected_output)(struct sk_buff*);
122 int (*hh_output)(struct sk_buff*);
123 int (*queue_xmit)(struct sk_buff*);
124};
125
126struct pneigh_entry
127{
128 struct pneigh_entry *next;
129 struct net_device *dev;
130 u8 flags;
131 u8 key[0];
132};
133
134
135
136
137
138
139struct neigh_table
140{
141 struct neigh_table *next;
142 int family;
143 int entry_size;
144 int key_len;
145 __u32 (*hash)(const void *pkey, const struct net_device *);
146 int (*constructor)(struct neighbour *);
147 int (*pconstructor)(struct pneigh_entry *);
148 void (*pdestructor)(struct pneigh_entry *);
149 void (*proxy_redo)(struct sk_buff *skb);
150 char *id;
151 struct neigh_parms parms;
152
153 int gc_interval;
154 int gc_thresh1;
155 int gc_thresh2;
156 int gc_thresh3;
157 unsigned long last_flush;
158 struct timer_list gc_timer;
159 struct timer_list proxy_timer;
160 struct sk_buff_head proxy_queue;
161 atomic_t entries;
162 rwlock_t lock;
163 unsigned long last_rand;
164 struct kmem_cache *kmem_cachep;
165 struct neigh_statistics *stats;
166 struct neighbour **hash_buckets;
167 unsigned int hash_mask;
168 __u32 hash_rnd;
169 unsigned int hash_chain_gc;
170 struct pneigh_entry **phash_buckets;
171#ifdef CONFIG_PROC_FS
172 struct proc_dir_entry *pde;
173#endif
174};
175
176
177#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
178#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
179#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
180#define NEIGH_UPDATE_F_ISROUTER 0x40000000
181#define NEIGH_UPDATE_F_ADMIN 0x80000000
182
183extern void neigh_table_init(struct neigh_table *tbl);
184extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
185extern int neigh_table_clear(struct neigh_table *tbl);
186extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
187 const void *pkey,
188 struct net_device *dev);
189extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
190 const void *pkey);
191extern struct neighbour * neigh_create(struct neigh_table *tbl,
192 const void *pkey,
193 struct net_device *dev);
194extern void neigh_destroy(struct neighbour *neigh);
195extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
196extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
197 u32 flags);
198extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
199extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
200extern int neigh_resolve_output(struct sk_buff *skb);
201extern int neigh_connected_output(struct sk_buff *skb);
202extern int neigh_compat_output(struct sk_buff *skb);
203extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
204 u8 *lladdr, void *saddr,
205 struct net_device *dev);
206
207extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
208extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
209extern void neigh_parms_destroy(struct neigh_parms *parms);
210extern unsigned long neigh_rand_reach_time(unsigned long base);
211
212extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
213 struct sk_buff *skb);
214extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
215extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
216
217extern void neigh_app_ns(struct neighbour *n);
218extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
219extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
220extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
221
222struct neigh_seq_state {
223 struct neigh_table *tbl;
224 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
225 struct neighbour *n, loff_t *pos);
226 unsigned int bucket;
227 unsigned int flags;
228#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
229#define NEIGH_SEQ_IS_PNEIGH 0x00000002
230#define NEIGH_SEQ_SKIP_NOARP 0x00000004
231};
232extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
233extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
234extern void neigh_seq_stop(struct seq_file *, void *);
235
236extern int neigh_sysctl_register(struct net_device *dev,
237 struct neigh_parms *p,
238 int p_id, int pdev_id,
239 char *p_name,
240 proc_handler *proc_handler,
241 ctl_handler *strategy);
242extern void neigh_sysctl_unregister(struct neigh_parms *p);
243
244static inline void __neigh_parms_put(struct neigh_parms *parms)
245{
246 atomic_dec(&parms->refcnt);
247}
248
249static inline void neigh_parms_put(struct neigh_parms *parms)
250{
251 if (atomic_dec_and_test(&parms->refcnt))
252 neigh_parms_destroy(parms);
253}
254
255static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
256{
257 atomic_inc(&parms->refcnt);
258 return parms;
259}
260
261
262
263
264
265static inline void neigh_release(struct neighbour *neigh)
266{
267 if (atomic_dec_and_test(&neigh->refcnt))
268 neigh_destroy(neigh);
269}
270
271static inline struct neighbour * neigh_clone(struct neighbour *neigh)
272{
273 if (neigh)
274 atomic_inc(&neigh->refcnt);
275 return neigh;
276}
277
278#define neigh_hold(n) atomic_inc(&(n)->refcnt)
279
280static inline void neigh_confirm(struct neighbour *neigh)
281{
282 if (neigh)
283 neigh->confirmed = jiffies;
284}
285
286static inline int neigh_is_connected(struct neighbour *neigh)
287{
288 return neigh->nud_state&NUD_CONNECTED;
289}
290
291static inline int neigh_is_valid(struct neighbour *neigh)
292{
293 return neigh->nud_state&NUD_VALID;
294}
295
296static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
297{
298 neigh->used = jiffies;
299 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
300 return __neigh_event_send(neigh, skb);
301 return 0;
302}
303
304static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
305{
306 unsigned seq;
307 int hh_len;
308
309 do {
310 int hh_alen;
311
312 seq = read_seqbegin(&hh->hh_lock);
313 hh_len = hh->hh_len;
314 hh_alen = HH_DATA_ALIGN(hh_len);
315 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
316 } while (read_seqretry(&hh->hh_lock, seq));
317
318 skb_push(skb, hh_len);
319 return hh->hh_output(skb);
320}
321
322static inline struct neighbour *
323__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
324{
325 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
326
327 if (n || !creat)
328 return n;
329
330 n = neigh_create(tbl, pkey, dev);
331 return IS_ERR(n) ? NULL : n;
332}
333
334static inline struct neighbour *
335__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
336 struct net_device *dev)
337{
338 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
339
340 if (n)
341 return n;
342
343 return neigh_create(tbl, pkey, dev);
344}
345
346struct neighbour_cb {
347 unsigned long sched_next;
348 unsigned int flags;
349};
350
351#define LOCALLY_ENQUEUED 0x1
352
353#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
354
355#endif
356
