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 #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
72 struct neigh_statistics
73 {
74 unsigned long allocs; /* number of allocated neighs */
75 unsigned long destroys; /* number of destroyed neighs */
76 unsigned long hash_grows; /* number of hash resizes */
77
78 unsigned long res_failed; /* number of failed resolutions */
79
80 unsigned long lookups; /* number of lookups */
81 unsigned long hits; /* number of hits (among lookups) */
82
83 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
84 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
85
86 unsigned long periodic_gc_runs; /* number of periodic GC runs */
87 unsigned long forced_gc_runs; /* number of forced GC runs */
88
89 unsigned long unres_discards; /* number of unresolved drops */
90 };
91
92 #define NEIGH_CACHE_STAT_INC(tbl, field) \
93 do { \
94 preempt_disable(); \
95 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
96 preempt_enable(); \
97 } while (0)
98
99 struct neighbour
100 {
101 struct neighbour *next;
102 struct neigh_table *tbl;
103 struct neigh_parms *parms;
104 struct net_device *dev;
105 unsigned long used;
106 unsigned long confirmed;
107 unsigned long updated;
108 __u8 flags;
109 __u8 nud_state;
110 __u8 type;
111 __u8 dead;
112 atomic_t probes;
113 rwlock_t lock;
114 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
115 struct hh_cache *hh;
116 atomic_t refcnt;
117 int (*output)(struct sk_buff *skb);
118 struct sk_buff_head arp_queue;
119 struct timer_list timer;
120 struct neigh_ops *ops;
121 u8 primary_key[0];
122 };
123
124 struct neigh_ops
125 {
126 int family;
127 void (*solicit)(struct neighbour *, struct sk_buff*);
128 void (*error_report)(struct neighbour *, struct sk_buff*);
129 int (*output)(struct sk_buff*);
130 int (*connected_output)(struct sk_buff*);
131 int (*hh_output)(struct sk_buff*);
132 int (*queue_xmit)(struct sk_buff*);
133 };
134
135 struct pneigh_entry
136 {
137 struct pneigh_entry *next;
138 #ifdef CONFIG_NET_NS
139 struct net *net;
140 #endif
141 struct net_device *dev;
142 u8 flags;
143 u8 key[0];
144 };
145
146 /*
147 * neighbour table manipulation
148 */
149
150
151 struct neigh_table
152 {
153 struct neigh_table *next;
154 int family;
155 int entry_size;
156 int key_len;
157 __u32 (*hash)(const void *pkey, const struct net_device *);
158 int (*constructor)(struct neighbour *);
159 int (*pconstructor)(struct pneigh_entry *);
160 void (*pdestructor)(struct pneigh_entry *);
161 void (*proxy_redo)(struct sk_buff *skb);
162 char *id;
163 struct neigh_parms parms;
164 /* HACK. gc_* shoul follow parms without a gap! */
165 int gc_interval;
166 int gc_thresh1;
167 int gc_thresh2;
168 int gc_thresh3;
169 unsigned long last_flush;
170 struct timer_list gc_timer;
171 struct timer_list proxy_timer;
172 struct sk_buff_head proxy_queue;
173 atomic_t entries;
174 rwlock_t lock;
175 unsigned long last_rand;
176 struct kmem_cache *kmem_cachep;
177 struct neigh_statistics *stats;
178 struct neighbour **hash_buckets;
179 unsigned int hash_mask;
180 __u32 hash_rnd;
181 unsigned int hash_chain_gc;
182 struct pneigh_entry **phash_buckets;
183 };
184
185 /* flags for neigh_update() */
186 #define NEIGH_UPDATE_F_OVERRIDE 0x00000001
187 #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
188 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
189 #define NEIGH_UPDATE_F_ISROUTER 0x40000000
190 #define NEIGH_UPDATE_F_ADMIN 0x80000000
191
192 extern void neigh_table_init(struct neigh_table *tbl);
193 extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
194 extern int neigh_table_clear(struct neigh_table *tbl);
195 extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
196 const void *pkey,
197 struct net_device *dev);
198 extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
199 struct net *net,
200 const void *pkey);
201 extern struct neighbour * neigh_create(struct neigh_table *tbl,
202 const void *pkey,
203 struct net_device *dev);
204 extern void neigh_destroy(struct neighbour *neigh);
205 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
206 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
207 u32 flags);
208 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
209 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
210 extern int neigh_resolve_output(struct sk_buff *skb);
211 extern int neigh_connected_output(struct sk_buff *skb);
212 extern int neigh_compat_output(struct sk_buff *skb);
213 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
214 u8 *lladdr, void *saddr,
215 struct net_device *dev);
216
217 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
218 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
219
220 static inline
221 struct net *neigh_parms_net(const struct neigh_parms *parms)
222 {
223 return read_pnet(&parms->net);
224 }
225
226 extern unsigned long neigh_rand_reach_time(unsigned long base);
227
228 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
229 struct sk_buff *skb);
230 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat);
231 extern struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl,
232 struct net *net,
233 const void *key,
234 struct net_device *dev);
235 extern int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);
236
237 static inline
238 struct net *pneigh_net(const struct pneigh_entry *pneigh)
239 {
240 return read_pnet(&pneigh->net);
241 }
242
243 extern void neigh_app_ns(struct neighbour *n);
244 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
245 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
246 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
247
248 struct neigh_seq_state {
249 struct seq_net_private p;
250 struct neigh_table *tbl;
251 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
252 struct neighbour *n, loff_t *pos);
253 unsigned int bucket;
254 unsigned int flags;
255 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
256 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
257 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
258 };
259 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
260 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
261 extern void neigh_seq_stop(struct seq_file *, void *);
262
263 extern int neigh_sysctl_register(struct net_device *dev,
264 struct neigh_parms *p,
265 int p_id, int pdev_id,
266 char *p_name,
267 proc_handler *proc_handler,
268 ctl_handler *strategy);
269 extern void neigh_sysctl_unregister(struct neigh_parms *p);
270
271 static inline void __neigh_parms_put(struct neigh_parms *parms)
272 {
273 atomic_dec(&parms->refcnt);
274 }
275
276 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
277 {
278 atomic_inc(&parms->refcnt);
279 return parms;
280 }
281
282 /*
283 * Neighbour references
284 */
285
286 static inline void neigh_release(struct neighbour *neigh)
287 {
288 if (atomic_dec_and_test(&neigh->refcnt))
289 neigh_destroy(neigh);
290 }
291
292 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
293 {
294 if (neigh)
295 atomic_inc(&neigh->refcnt);
296 return neigh;
297 }
298
299 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
300
301 static inline void neigh_confirm(struct neighbour *neigh)
302 {
303 if (neigh)
304 neigh->confirmed = jiffies;
305 }
306
307 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
308 {
309 neigh->used = jiffies;
310 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
311 return __neigh_event_send(neigh, skb);
312 return 0;
313 }
314
315 static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
316 {
317 unsigned seq;
318 int hh_len;
319
320 do {
321 int hh_alen;
322
323 seq = read_seqbegin(&hh->hh_lock);
324 hh_len = hh->hh_len;
325 hh_alen = HH_DATA_ALIGN(hh_len);
326 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
327 } while (read_seqretry(&hh->hh_lock, seq));
328
329 skb_push(skb, hh_len);
330 return hh->hh_output(skb);
331 }
332
333 static inline struct neighbour *
334 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
335 {
336 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
337
338 if (n || !creat)
339 return n;
340
341 n = neigh_create(tbl, pkey, dev);
342 return IS_ERR(n) ? NULL : n;
343 }
344
345 static inline struct neighbour *
346 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
347 struct net_device *dev)
348 {
349 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
350
351 if (n)
352 return n;
353
354 return neigh_create(tbl, pkey, dev);
355 }
356
357 struct neighbour_cb {
358 unsigned long sched_next;
359 unsigned int flags;
360 };
361
362 #define LOCALLY_ENQUEUED 0x1
363
364 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
365
366 #endif
367
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