1 #ifndef _NET_NEIGHBOUR_H
2 #define _NET_NEIGHBOUR_H
3
4 #include <linux/neighbour.h>
5
6 /*
7 * Generic neighbour manipulation
8 *
9 * Authors:
10 * Pedro Roque <roque@di.fc.ul.pt>
11 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
12 *
13 * Changes:
14 *
15 * Harald Welte: <laforge@gnumonks.org>
16 * - Add neighbour cache statistics like rtstat
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 /*
30 * NUD stands for "neighbor unreachability detection"
31 */
32
33 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
34 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
35 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
36
37 struct neighbour;
38
39 struct neigh_parms
40 {
41 struct net *net;
42 struct net_device *dev;
43 struct neigh_parms *next;
44 int (*neigh_setup)(struct neighbour *);
45 void (*neigh_cleanup)(struct neighbour *);
46 struct neigh_table *tbl;
47
48 void *sysctl_table;
49
50 int dead;
51 atomic_t refcnt;
52 struct rcu_head rcu_head;
53
54 int base_reachable_time;
55 int retrans_time;
56 int gc_staletime;
57 int reachable_time;
58 int delay_probe_time;
59
60 int queue_len;
61 int ucast_probes;
62 int app_probes;
63 int mcast_probes;
64 int anycast_delay;
65 int proxy_delay;
66 int proxy_qlen;
67 int locktime;
68 };
69
70 struct neigh_statistics
71 {
72 unsigned long allocs; /* number of allocated neighs */
73 unsigned long destroys; /* number of destroyed neighs */
74 unsigned long hash_grows; /* number of hash resizes */
75
76 unsigned long res_failed; /* nomber of failed resolutions */
77
78 unsigned long lookups; /* number of lookups */
79 unsigned long hits; /* number of hits (among lookups) */
80
81 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
82 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
83
84 unsigned long periodic_gc_runs; /* number of periodic GC runs */
85 unsigned long forced_gc_runs; /* number of forced GC runs */
86 };
87
88 #define NEIGH_CACHE_STAT_INC(tbl, field) \
89 do { \
90 preempt_disable(); \
91 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
92 preempt_enable(); \
93 } while (0)
94
95 struct neighbour
96 {
97 struct neighbour *next;
98 struct neigh_table *tbl;
99 struct neigh_parms *parms;
100 struct net_device *dev;
101 unsigned long used;
102 unsigned long confirmed;
103 unsigned long updated;
104 __u8 flags;
105 __u8 nud_state;
106 __u8 type;
107 __u8 dead;
108 atomic_t probes;
109 rwlock_t lock;
110 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
111 struct hh_cache *hh;
112 atomic_t refcnt;
113 int (*output)(struct sk_buff *skb);
114 struct sk_buff_head arp_queue;
115 struct timer_list timer;
116 struct neigh_ops *ops;
117 u8 primary_key[0];
118 };
119
120 struct neigh_ops
121 {
122 int family;
123 void (*solicit)(struct neighbour *, struct sk_buff*);
124 void (*error_report)(struct neighbour *, struct sk_buff*);
125 int (*output)(struct sk_buff*);
126 int (*connected_output)(struct sk_buff*);
127 int (*hh_output)(struct sk_buff*);
128 int (*queue_xmit)(struct sk_buff*);
129 };
130
131 struct pneigh_entry
132 {
133 struct pneigh_entry *next;
134 struct net *net;
135 struct net_device *dev;
136 u8 flags;
137 u8 key[0];
138 };
139
140 /*
141 * neighbour table manipulation
142 */
143
144
145 struct neigh_table
146 {
147 struct neigh_table *next;
148 int family;
149 int entry_size;
150 int key_len;
151 __u32 (*hash)(const void *pkey, const struct net_device *);
152 int (*constructor)(struct neighbour *);
153 int (*pconstructor)(struct pneigh_entry *);
154 void (*pdestructor)(struct pneigh_entry *);
155 void (*proxy_redo)(struct sk_buff *skb);
156 char *id;
157 struct neigh_parms parms;
158 /* HACK. gc_* shoul follow parms without a gap! */
159 int gc_interval;
160 int gc_thresh1;
161 int gc_thresh2;
162 int gc_thresh3;
163 unsigned long last_flush;
164 struct timer_list gc_timer;
165 struct timer_list proxy_timer;
166 struct sk_buff_head proxy_queue;
167 atomic_t entries;
168 rwlock_t lock;
169 unsigned long last_rand;
170 struct kmem_cache *kmem_cachep;
171 struct neigh_statistics *stats;
172 struct neighbour **hash_buckets;
173 unsigned int hash_mask;
174 __u32 hash_rnd;
175 unsigned int hash_chain_gc;
176 struct pneigh_entry **phash_buckets;
177 #ifdef CONFIG_PROC_FS
178 struct proc_dir_entry *pde;
179 #endif
180 };
181
182 /* flags for neigh_update() */
183 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001
184 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
185 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
186 #define NEIGH_UPDATE_F_ISROUTER 0x40000000
187 #define NEIGH_UPDATE_F_ADMIN 0x80000000
188
189 extern void neigh_table_init(struct neigh_table *tbl);
190 extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
191 extern int neigh_table_clear(struct neigh_table *tbl);
192 extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
193 const void *pkey,
194 struct net_device *dev);
195 extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
196 struct net *net,
197 const void *pkey);
198 extern struct neighbour * neigh_create(struct neigh_table *tbl,
199 const void *pkey,
200 struct net_device *dev);
201 extern void neigh_destroy(struct neighbour *neigh);
202 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
203 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
204 u32 flags);
205 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
206 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
207 extern int neigh_resolve_output(struct sk_buff *skb);
208 extern int neigh_connected_output(struct sk_buff *skb);
209 extern int neigh_compat_output(struct sk_buff *skb);
210 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
211 u8 *lladdr, void *saddr,
212 struct net_device *dev);
213
214 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
215 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
216 extern unsigned long neigh_rand_reach_time(unsigned long base);
217
218 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
219 struct sk_buff *skb);
220 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat);
221 extern struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
222 struct net *net,
223 const void *key,
224 struct net_device *dev);
225 extern int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);
226
227 extern void neigh_app_ns(struct neighbour *n);
228 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
229 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
230 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
231
232 struct neigh_seq_state {
233 struct seq_net_private p;
234 struct neigh_table *tbl;
235 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
236 struct neighbour *n, loff_t *pos);
237 unsigned int bucket;
238 unsigned int flags;
239 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
240 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
241 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
242 };
243 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
244 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
245 extern void neigh_seq_stop(struct seq_file *, void *);
246
247 extern int neigh_sysctl_register(struct net_device *dev,
248 struct neigh_parms *p,
249 int p_id, int pdev_id,
250 char *p_name,
251 proc_handler *proc_handler,
252 ctl_handler *strategy);
253 extern void neigh_sysctl_unregister(struct neigh_parms *p);
254
255 static inline void __neigh_parms_put(struct neigh_parms *parms)
256 {
257 atomic_dec(&parms->refcnt);
258 }
259
260 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
261 {
262 atomic_inc(&parms->refcnt);
263 return parms;
264 }
265
266 /*
267 * Neighbour references
268 */
269
270 static inline void neigh_release(struct neighbour *neigh)
271 {
272 if (atomic_dec_and_test(&neigh->refcnt))
273 neigh_destroy(neigh);
274 }
275
276 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
277 {
278 if (neigh)
279 atomic_inc(&neigh->refcnt);
280 return neigh;
281 }
282
283 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
284
285 static inline void neigh_confirm(struct neighbour *neigh)
286 {
287 if (neigh)
288 neigh->confirmed = jiffies;
289 }
290
291 static inline int neigh_is_connected(struct neighbour *neigh)
292 {
293 return neigh->nud_state&NUD_CONNECTED;
294 }
295
296
297 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
298 {
299 neigh->used = jiffies;
300 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
301 return __neigh_event_send(neigh, skb);
302 return 0;
303 }
304
305 static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
306 {
307 unsigned seq;
308 int hh_len;
309
310 do {
311 int hh_alen;
312
313 seq = read_seqbegin(&hh->hh_lock);
314 hh_len = hh->hh_len;
315 hh_alen = HH_DATA_ALIGN(hh_len);
316 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
317 } while (read_seqretry(&hh->hh_lock, seq));
318
319 skb_push(skb, hh_len);
320 return hh->hh_output(skb);
321 }
322
323 static inline struct neighbour *
324 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
325 {
326 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
327
328 if (n || !creat)
329 return n;
330
331 n = neigh_create(tbl, pkey, dev);
332 return IS_ERR(n) ? NULL : n;
333 }
334
335 static inline struct neighbour *
336 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
337 struct net_device *dev)
338 {
339 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
340
341 if (n)
342 return n;
343
344 return neigh_create(tbl, pkey, dev);
345 }
346
347 struct neighbour_cb {
348 unsigned long sched_next;
349 unsigned int flags;
350 };
351
352 #define LOCALLY_ENQUEUED 0x1
353
354 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
355
356 #endif
357
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