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1da177e4 LT |
1 | #ifndef _NET_NEIGHBOUR_H |
2 | #define _NET_NEIGHBOUR_H | |
3 | ||
4 | /* | |
5 | * Generic neighbour manipulation | |
6 | * | |
7 | * Authors: | |
8 | * Pedro Roque <roque@di.fc.ul.pt> | |
9 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | |
10 | * | |
11 | * Changes: | |
12 | * | |
13 | * Harald Welte: <laforge@gnumonks.org> | |
14 | * - Add neighbour cache statistics like rtstat | |
15 | */ | |
16 | ||
17 | /* The following flags & states are exported to user space, | |
18 | so that they should be moved to include/linux/ directory. | |
19 | */ | |
20 | ||
21 | /* | |
22 | * Neighbor Cache Entry Flags | |
23 | */ | |
24 | ||
25 | #define NTF_PROXY 0x08 /* == ATF_PUBL */ | |
26 | #define NTF_ROUTER 0x80 | |
27 | ||
28 | /* | |
29 | * Neighbor Cache Entry States. | |
30 | */ | |
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 | /* Dummy states */ | |
40 | #define NUD_NOARP 0x40 | |
41 | #define NUD_PERMANENT 0x80 | |
42 | #define NUD_NONE 0x00 | |
43 | ||
44 | /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change | |
45 | and make no address resolution or NUD. | |
46 | NUD_PERMANENT is also cannot be deleted by garbage collectors. | |
47 | */ | |
48 | ||
49 | #ifdef __KERNEL__ | |
50 | ||
51 | #include <asm/atomic.h> | |
52 | #include <linux/skbuff.h> | |
53 | #include <linux/netdevice.h> | |
54 | #include <linux/rcupdate.h> | |
55 | #include <linux/seq_file.h> | |
56 | ||
57 | #include <linux/err.h> | |
58 | #include <linux/sysctl.h> | |
59 | ||
60 | #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE) | |
61 | #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) | |
62 | #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE) | |
63 | ||
64 | struct neighbour; | |
65 | ||
66 | struct neigh_parms | |
67 | { | |
c7fb64db | 68 | struct net_device *dev; |
1da177e4 LT |
69 | struct neigh_parms *next; |
70 | int (*neigh_setup)(struct neighbour *); | |
71 | struct neigh_table *tbl; | |
1da177e4 LT |
72 | |
73 | void *sysctl_table; | |
74 | ||
75 | int dead; | |
76 | atomic_t refcnt; | |
77 | struct rcu_head rcu_head; | |
78 | ||
79 | int base_reachable_time; | |
80 | int retrans_time; | |
81 | int gc_staletime; | |
82 | int reachable_time; | |
83 | int delay_probe_time; | |
84 | ||
85 | int queue_len; | |
86 | int ucast_probes; | |
87 | int app_probes; | |
88 | int mcast_probes; | |
89 | int anycast_delay; | |
90 | int proxy_delay; | |
91 | int proxy_qlen; | |
92 | int locktime; | |
93 | }; | |
94 | ||
95 | struct neigh_statistics | |
96 | { | |
97 | unsigned long allocs; /* number of allocated neighs */ | |
98 | unsigned long destroys; /* number of destroyed neighs */ | |
99 | unsigned long hash_grows; /* number of hash resizes */ | |
100 | ||
101 | unsigned long res_failed; /* nomber of failed resolutions */ | |
102 | ||
103 | unsigned long lookups; /* number of lookups */ | |
104 | unsigned long hits; /* number of hits (among lookups) */ | |
105 | ||
106 | unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */ | |
107 | unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */ | |
108 | ||
109 | unsigned long periodic_gc_runs; /* number of periodic GC runs */ | |
110 | unsigned long forced_gc_runs; /* number of forced GC runs */ | |
111 | }; | |
112 | ||
113 | #define NEIGH_CACHE_STAT_INC(tbl, field) \ | |
114 | do { \ | |
115 | preempt_disable(); \ | |
116 | (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \ | |
117 | preempt_enable(); \ | |
118 | } while (0) | |
119 | ||
120 | struct neighbour | |
121 | { | |
122 | struct neighbour *next; | |
123 | struct neigh_table *tbl; | |
124 | struct neigh_parms *parms; | |
125 | struct net_device *dev; | |
126 | unsigned long used; | |
127 | unsigned long confirmed; | |
128 | unsigned long updated; | |
129 | __u8 flags; | |
130 | __u8 nud_state; | |
131 | __u8 type; | |
132 | __u8 dead; | |
133 | atomic_t probes; | |
134 | rwlock_t lock; | |
135 | unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)]; | |
136 | struct hh_cache *hh; | |
137 | atomic_t refcnt; | |
138 | int (*output)(struct sk_buff *skb); | |
139 | struct sk_buff_head arp_queue; | |
140 | struct timer_list timer; | |
141 | struct neigh_ops *ops; | |
142 | u8 primary_key[0]; | |
143 | }; | |
144 | ||
145 | struct neigh_ops | |
146 | { | |
147 | int family; | |
148 | void (*destructor)(struct neighbour *); | |
149 | void (*solicit)(struct neighbour *, struct sk_buff*); | |
150 | void (*error_report)(struct neighbour *, struct sk_buff*); | |
151 | int (*output)(struct sk_buff*); | |
152 | int (*connected_output)(struct sk_buff*); | |
153 | int (*hh_output)(struct sk_buff*); | |
154 | int (*queue_xmit)(struct sk_buff*); | |
155 | }; | |
156 | ||
157 | struct pneigh_entry | |
158 | { | |
159 | struct pneigh_entry *next; | |
160 | struct net_device *dev; | |
161 | u8 key[0]; | |
162 | }; | |
163 | ||
164 | /* | |
165 | * neighbour table manipulation | |
166 | */ | |
167 | ||
168 | ||
169 | struct neigh_table | |
170 | { | |
171 | struct neigh_table *next; | |
172 | int family; | |
173 | int entry_size; | |
174 | int key_len; | |
175 | __u32 (*hash)(const void *pkey, const struct net_device *); | |
176 | int (*constructor)(struct neighbour *); | |
177 | int (*pconstructor)(struct pneigh_entry *); | |
178 | void (*pdestructor)(struct pneigh_entry *); | |
179 | void (*proxy_redo)(struct sk_buff *skb); | |
180 | char *id; | |
181 | struct neigh_parms parms; | |
182 | /* HACK. gc_* shoul follow parms without a gap! */ | |
183 | int gc_interval; | |
184 | int gc_thresh1; | |
185 | int gc_thresh2; | |
186 | int gc_thresh3; | |
187 | unsigned long last_flush; | |
188 | struct timer_list gc_timer; | |
189 | struct timer_list proxy_timer; | |
190 | struct sk_buff_head proxy_queue; | |
191 | atomic_t entries; | |
192 | rwlock_t lock; | |
193 | unsigned long last_rand; | |
1da177e4 LT |
194 | kmem_cache_t *kmem_cachep; |
195 | struct neigh_statistics *stats; | |
196 | struct neighbour **hash_buckets; | |
197 | unsigned int hash_mask; | |
198 | __u32 hash_rnd; | |
199 | unsigned int hash_chain_gc; | |
200 | struct pneigh_entry **phash_buckets; | |
201 | #ifdef CONFIG_PROC_FS | |
202 | struct proc_dir_entry *pde; | |
203 | #endif | |
204 | }; | |
205 | ||
206 | /* flags for neigh_update() */ | |
207 | #define NEIGH_UPDATE_F_OVERRIDE 0x00000001 | |
208 | #define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002 | |
209 | #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004 | |
210 | #define NEIGH_UPDATE_F_ISROUTER 0x40000000 | |
211 | #define NEIGH_UPDATE_F_ADMIN 0x80000000 | |
212 | ||
213 | extern void neigh_table_init(struct neigh_table *tbl); | |
214 | extern int neigh_table_clear(struct neigh_table *tbl); | |
215 | extern struct neighbour * neigh_lookup(struct neigh_table *tbl, | |
216 | const void *pkey, | |
217 | struct net_device *dev); | |
218 | extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl, | |
219 | const void *pkey); | |
220 | extern struct neighbour * neigh_create(struct neigh_table *tbl, | |
221 | const void *pkey, | |
222 | struct net_device *dev); | |
223 | extern void neigh_destroy(struct neighbour *neigh); | |
224 | extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb); | |
225 | extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, | |
226 | u32 flags); | |
227 | extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev); | |
228 | extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev); | |
229 | extern int neigh_resolve_output(struct sk_buff *skb); | |
230 | extern int neigh_connected_output(struct sk_buff *skb); | |
231 | extern int neigh_compat_output(struct sk_buff *skb); | |
232 | extern struct neighbour *neigh_event_ns(struct neigh_table *tbl, | |
233 | u8 *lladdr, void *saddr, | |
234 | struct net_device *dev); | |
235 | ||
236 | extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl); | |
237 | extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms); | |
238 | extern void neigh_parms_destroy(struct neigh_parms *parms); | |
239 | extern unsigned long neigh_rand_reach_time(unsigned long base); | |
240 | ||
241 | extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, | |
242 | struct sk_buff *skb); | |
243 | extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat); | |
244 | extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev); | |
245 | ||
246 | struct netlink_callback; | |
247 | struct nlmsghdr; | |
248 | extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb); | |
249 | extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); | |
250 | extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); | |
251 | extern void neigh_app_ns(struct neighbour *n); | |
252 | ||
c7fb64db TG |
253 | extern int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb); |
254 | extern int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg); | |
255 | ||
1da177e4 LT |
256 | extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); |
257 | extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); | |
258 | extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); | |
259 | ||
260 | struct neigh_seq_state { | |
261 | struct neigh_table *tbl; | |
262 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, | |
263 | struct neighbour *n, loff_t *pos); | |
264 | unsigned int bucket; | |
265 | unsigned int flags; | |
266 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
267 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
268 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
269 | }; | |
270 | extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); | |
271 | extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
272 | extern void neigh_seq_stop(struct seq_file *, void *); | |
273 | ||
274 | extern int neigh_sysctl_register(struct net_device *dev, | |
275 | struct neigh_parms *p, | |
276 | int p_id, int pdev_id, | |
277 | char *p_name, | |
278 | proc_handler *proc_handler, | |
279 | ctl_handler *strategy); | |
280 | extern void neigh_sysctl_unregister(struct neigh_parms *p); | |
281 | ||
282 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
283 | { | |
284 | atomic_dec(&parms->refcnt); | |
285 | } | |
286 | ||
287 | static inline void neigh_parms_put(struct neigh_parms *parms) | |
288 | { | |
289 | if (atomic_dec_and_test(&parms->refcnt)) | |
290 | neigh_parms_destroy(parms); | |
291 | } | |
292 | ||
293 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) | |
294 | { | |
295 | atomic_inc(&parms->refcnt); | |
296 | return parms; | |
297 | } | |
298 | ||
299 | /* | |
300 | * Neighbour references | |
301 | */ | |
302 | ||
303 | static inline void neigh_release(struct neighbour *neigh) | |
304 | { | |
305 | if (atomic_dec_and_test(&neigh->refcnt)) | |
306 | neigh_destroy(neigh); | |
307 | } | |
308 | ||
309 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
310 | { | |
311 | if (neigh) | |
312 | atomic_inc(&neigh->refcnt); | |
313 | return neigh; | |
314 | } | |
315 | ||
316 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
317 | ||
318 | static inline void neigh_confirm(struct neighbour *neigh) | |
319 | { | |
320 | if (neigh) | |
321 | neigh->confirmed = jiffies; | |
322 | } | |
323 | ||
324 | static inline int neigh_is_connected(struct neighbour *neigh) | |
325 | { | |
326 | return neigh->nud_state&NUD_CONNECTED; | |
327 | } | |
328 | ||
329 | static inline int neigh_is_valid(struct neighbour *neigh) | |
330 | { | |
331 | return neigh->nud_state&NUD_VALID; | |
332 | } | |
333 | ||
334 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
335 | { | |
336 | neigh->used = jiffies; | |
337 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) | |
338 | return __neigh_event_send(neigh, skb); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static inline struct neighbour * | |
343 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
344 | { | |
345 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
346 | ||
347 | if (n || !creat) | |
348 | return n; | |
349 | ||
350 | n = neigh_create(tbl, pkey, dev); | |
351 | return IS_ERR(n) ? NULL : n; | |
352 | } | |
353 | ||
354 | static inline struct neighbour * | |
355 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
356 | struct net_device *dev) | |
357 | { | |
358 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
359 | ||
360 | if (n) | |
361 | return n; | |
362 | ||
363 | return neigh_create(tbl, pkey, dev); | |
364 | } | |
365 | ||
366 | #define LOCALLY_ENQUEUED -2 | |
367 | ||
368 | #endif | |
369 | #endif | |
370 | ||
371 |