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1da177e4 LT |
1 | #ifndef _NET_NEIGHBOUR_H |
2 | #define _NET_NEIGHBOUR_H | |
3 | ||
9067c722 TG |
4 | #include <linux/neighbour.h> |
5 | ||
1da177e4 LT |
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 | ||
1da177e4 | 19 | #include <asm/atomic.h> |
1da177e4 | 20 | #include <linux/netdevice.h> |
14c85021 | 21 | #include <linux/skbuff.h> |
1da177e4 LT |
22 | #include <linux/rcupdate.h> |
23 | #include <linux/seq_file.h> | |
24 | ||
25 | #include <linux/err.h> | |
26 | #include <linux/sysctl.h> | |
c8822a4e | 27 | #include <net/rtnetlink.h> |
1da177e4 | 28 | |
39971554 PE |
29 | /* |
30 | * NUD stands for "neighbor unreachability detection" | |
31 | */ | |
32 | ||
1da177e4 LT |
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 | { | |
426b5303 | 41 | struct net *net; |
c7fb64db | 42 | struct net_device *dev; |
1da177e4 LT |
43 | struct neigh_parms *next; |
44 | int (*neigh_setup)(struct neighbour *); | |
ecbb4169 | 45 | void (*neigh_cleanup)(struct neighbour *); |
1da177e4 | 46 | struct neigh_table *tbl; |
1da177e4 LT |
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; | |
d924424a | 110 | unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
1da177e4 LT |
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; | |
1da177e4 LT |
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; | |
426b5303 EB |
134 | struct net *net; |
135 | struct net_device *dev; | |
62dd9318 | 136 | u8 flags; |
1da177e4 LT |
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; | |
e18b890b | 170 | struct kmem_cache *kmem_cachep; |
1da177e4 LT |
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); | |
bd89efc5 | 190 | extern void neigh_table_init_no_netlink(struct neigh_table *tbl); |
1da177e4 LT |
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, | |
426b5303 | 196 | struct net *net, |
1da177e4 LT |
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); | |
1da177e4 LT |
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); | |
426b5303 EB |
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 int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev); | |
1da177e4 | 222 | |
1da177e4 | 223 | extern void neigh_app_ns(struct neighbour *n); |
1da177e4 LT |
224 | extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie); |
225 | extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *)); | |
226 | extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *)); | |
227 | ||
228 | struct neigh_seq_state { | |
42508461 | 229 | struct seq_net_private p; |
1da177e4 LT |
230 | struct neigh_table *tbl; |
231 | void *(*neigh_sub_iter)(struct neigh_seq_state *state, | |
232 | struct neighbour *n, loff_t *pos); | |
233 | unsigned int bucket; | |
234 | unsigned int flags; | |
235 | #define NEIGH_SEQ_NEIGH_ONLY 0x00000001 | |
236 | #define NEIGH_SEQ_IS_PNEIGH 0x00000002 | |
237 | #define NEIGH_SEQ_SKIP_NOARP 0x00000004 | |
238 | }; | |
239 | extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int); | |
240 | extern void *neigh_seq_next(struct seq_file *, void *, loff_t *); | |
241 | extern void neigh_seq_stop(struct seq_file *, void *); | |
242 | ||
243 | extern int neigh_sysctl_register(struct net_device *dev, | |
244 | struct neigh_parms *p, | |
245 | int p_id, int pdev_id, | |
246 | char *p_name, | |
247 | proc_handler *proc_handler, | |
248 | ctl_handler *strategy); | |
249 | extern void neigh_sysctl_unregister(struct neigh_parms *p); | |
250 | ||
251 | static inline void __neigh_parms_put(struct neigh_parms *parms) | |
252 | { | |
253 | atomic_dec(&parms->refcnt); | |
254 | } | |
255 | ||
1da177e4 LT |
256 | static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms) |
257 | { | |
258 | atomic_inc(&parms->refcnt); | |
259 | return parms; | |
260 | } | |
261 | ||
262 | /* | |
263 | * Neighbour references | |
264 | */ | |
265 | ||
266 | static inline void neigh_release(struct neighbour *neigh) | |
267 | { | |
268 | if (atomic_dec_and_test(&neigh->refcnt)) | |
269 | neigh_destroy(neigh); | |
270 | } | |
271 | ||
272 | static inline struct neighbour * neigh_clone(struct neighbour *neigh) | |
273 | { | |
274 | if (neigh) | |
275 | atomic_inc(&neigh->refcnt); | |
276 | return neigh; | |
277 | } | |
278 | ||
279 | #define neigh_hold(n) atomic_inc(&(n)->refcnt) | |
280 | ||
281 | static inline void neigh_confirm(struct neighbour *neigh) | |
282 | { | |
283 | if (neigh) | |
284 | neigh->confirmed = jiffies; | |
285 | } | |
286 | ||
287 | static inline int neigh_is_connected(struct neighbour *neigh) | |
288 | { | |
289 | return neigh->nud_state&NUD_CONNECTED; | |
290 | } | |
291 | ||
1da177e4 LT |
292 | |
293 | static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) | |
294 | { | |
295 | neigh->used = jiffies; | |
296 | if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) | |
297 | return __neigh_event_send(neigh, skb); | |
298 | return 0; | |
299 | } | |
300 | ||
3644f0ce SH |
301 | static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) |
302 | { | |
303 | unsigned seq; | |
304 | int hh_len; | |
305 | ||
306 | do { | |
307 | int hh_alen; | |
308 | ||
309 | seq = read_seqbegin(&hh->hh_lock); | |
310 | hh_len = hh->hh_len; | |
311 | hh_alen = HH_DATA_ALIGN(hh_len); | |
312 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
313 | } while (read_seqretry(&hh->hh_lock, seq)); | |
314 | ||
315 | skb_push(skb, hh_len); | |
316 | return hh->hh_output(skb); | |
317 | } | |
318 | ||
1da177e4 LT |
319 | static inline struct neighbour * |
320 | __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat) | |
321 | { | |
322 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
323 | ||
324 | if (n || !creat) | |
325 | return n; | |
326 | ||
327 | n = neigh_create(tbl, pkey, dev); | |
328 | return IS_ERR(n) ? NULL : n; | |
329 | } | |
330 | ||
331 | static inline struct neighbour * | |
332 | __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey, | |
333 | struct net_device *dev) | |
334 | { | |
335 | struct neighbour *n = neigh_lookup(tbl, pkey, dev); | |
336 | ||
337 | if (n) | |
338 | return n; | |
339 | ||
340 | return neigh_create(tbl, pkey, dev); | |
341 | } | |
342 | ||
a61bbcf2 PM |
343 | struct neighbour_cb { |
344 | unsigned long sched_next; | |
345 | unsigned int flags; | |
346 | }; | |
347 | ||
348 | #define LOCALLY_ENQUEUED 0x1 | |
349 | ||
350 | #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb) | |
1da177e4 LT |
351 | |
352 | #endif |