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