[GFS2] Alter direct I/O path
[linux-2.6/sactl.git] / include / net / neighbour.h
blob4901ee446879e59795f0df8d57a1c18ce9c7ce92
1 #ifndef _NET_NEIGHBOUR_H
2 #define _NET_NEIGHBOUR_H
4 /*
5 * Generic neighbour manipulation
7 * Authors:
8 * Pedro Roque <roque@di.fc.ul.pt>
9 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
11 * Changes:
13 * Harald Welte: <laforge@gnumonks.org>
14 * - Add neighbour cache statistics like rtstat
17 /* The following flags & states are exported to user space,
18 so that they should be moved to include/linux/ directory.
22 * Neighbor Cache Entry Flags
25 #define NTF_PROXY 0x08 /* == ATF_PUBL */
26 #define NTF_ROUTER 0x80
29 * Neighbor Cache Entry States.
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
39 /* Dummy states */
40 #define NUD_NOARP 0x40
41 #define NUD_PERMANENT 0x80
42 #define NUD_NONE 0x00
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.
49 #ifdef __KERNEL__
51 #include <asm/atomic.h>
52 #include <linux/netdevice.h>
53 #include <linux/skbuff.h>
54 #include <linux/rcupdate.h>
55 #include <linux/seq_file.h>
57 #include <linux/err.h>
58 #include <linux/sysctl.h>
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)
64 struct neighbour;
66 struct neigh_parms
68 struct net_device *dev;
69 struct neigh_parms *next;
70 int (*neigh_setup)(struct neighbour *);
71 void (*neigh_destructor)(struct neighbour *);
72 struct neigh_table *tbl;
74 void *sysctl_table;
76 int dead;
77 atomic_t refcnt;
78 struct rcu_head rcu_head;
80 int base_reachable_time;
81 int retrans_time;
82 int gc_staletime;
83 int reachable_time;
84 int delay_probe_time;
86 int queue_len;
87 int ucast_probes;
88 int app_probes;
89 int mcast_probes;
90 int anycast_delay;
91 int proxy_delay;
92 int proxy_qlen;
93 int locktime;
96 struct neigh_statistics
98 unsigned long allocs; /* number of allocated neighs */
99 unsigned long destroys; /* number of destroyed neighs */
100 unsigned long hash_grows; /* number of hash resizes */
102 unsigned long res_failed; /* nomber of failed resolutions */
104 unsigned long lookups; /* number of lookups */
105 unsigned long hits; /* number of hits (among lookups) */
107 unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
108 unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
110 unsigned long periodic_gc_runs; /* number of periodic GC runs */
111 unsigned long forced_gc_runs; /* number of forced GC runs */
114 #define NEIGH_CACHE_STAT_INC(tbl, field) \
115 do { \
116 preempt_disable(); \
117 (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
118 preempt_enable(); \
119 } while (0)
121 struct neighbour
123 struct neighbour *next;
124 struct neigh_table *tbl;
125 struct neigh_parms *parms;
126 struct net_device *dev;
127 unsigned long used;
128 unsigned long confirmed;
129 unsigned long updated;
130 __u8 flags;
131 __u8 nud_state;
132 __u8 type;
133 __u8 dead;
134 atomic_t probes;
135 rwlock_t lock;
136 unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
137 struct hh_cache *hh;
138 atomic_t refcnt;
139 int (*output)(struct sk_buff *skb);
140 struct sk_buff_head arp_queue;
141 struct timer_list timer;
142 struct neigh_ops *ops;
143 u8 primary_key[0];
146 struct neigh_ops
148 int family;
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*);
157 struct pneigh_entry
159 struct pneigh_entry *next;
160 struct net_device *dev;
161 u8 key[0];
165 * neighbour table manipulation
169 struct neigh_table
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;
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
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
213 extern void neigh_table_init(struct neigh_table *tbl);
214 extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
215 extern int neigh_table_clear(struct neigh_table *tbl);
216 extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
217 const void *pkey,
218 struct net_device *dev);
219 extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
220 const void *pkey);
221 extern struct neighbour * neigh_create(struct neigh_table *tbl,
222 const void *pkey,
223 struct net_device *dev);
224 extern void neigh_destroy(struct neighbour *neigh);
225 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
226 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
227 u32 flags);
228 extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
229 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
230 extern int neigh_resolve_output(struct sk_buff *skb);
231 extern int neigh_connected_output(struct sk_buff *skb);
232 extern int neigh_compat_output(struct sk_buff *skb);
233 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
234 u8 *lladdr, void *saddr,
235 struct net_device *dev);
237 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
238 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
239 extern void neigh_parms_destroy(struct neigh_parms *parms);
240 extern unsigned long neigh_rand_reach_time(unsigned long base);
242 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
243 struct sk_buff *skb);
244 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
245 extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
247 struct netlink_callback;
248 struct nlmsghdr;
249 extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
250 extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
251 extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
252 extern void neigh_app_ns(struct neighbour *n);
254 extern int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
255 extern int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
257 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
258 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
259 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
261 struct neigh_seq_state {
262 struct neigh_table *tbl;
263 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
264 struct neighbour *n, loff_t *pos);
265 unsigned int bucket;
266 unsigned int flags;
267 #define NEIGH_SEQ_NEIGH_ONLY 0x00000001
268 #define NEIGH_SEQ_IS_PNEIGH 0x00000002
269 #define NEIGH_SEQ_SKIP_NOARP 0x00000004
271 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
272 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
273 extern void neigh_seq_stop(struct seq_file *, void *);
275 extern int neigh_sysctl_register(struct net_device *dev,
276 struct neigh_parms *p,
277 int p_id, int pdev_id,
278 char *p_name,
279 proc_handler *proc_handler,
280 ctl_handler *strategy);
281 extern void neigh_sysctl_unregister(struct neigh_parms *p);
283 static inline void __neigh_parms_put(struct neigh_parms *parms)
285 atomic_dec(&parms->refcnt);
288 static inline void neigh_parms_put(struct neigh_parms *parms)
290 if (atomic_dec_and_test(&parms->refcnt))
291 neigh_parms_destroy(parms);
294 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
296 atomic_inc(&parms->refcnt);
297 return parms;
301 * Neighbour references
304 static inline void neigh_release(struct neighbour *neigh)
306 if (atomic_dec_and_test(&neigh->refcnt))
307 neigh_destroy(neigh);
310 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
312 if (neigh)
313 atomic_inc(&neigh->refcnt);
314 return neigh;
317 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
319 static inline void neigh_confirm(struct neighbour *neigh)
321 if (neigh)
322 neigh->confirmed = jiffies;
325 static inline int neigh_is_connected(struct neighbour *neigh)
327 return neigh->nud_state&NUD_CONNECTED;
330 static inline int neigh_is_valid(struct neighbour *neigh)
332 return neigh->nud_state&NUD_VALID;
335 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
337 neigh->used = jiffies;
338 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
339 return __neigh_event_send(neigh, skb);
340 return 0;
343 static inline struct neighbour *
344 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
346 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
348 if (n || !creat)
349 return n;
351 n = neigh_create(tbl, pkey, dev);
352 return IS_ERR(n) ? NULL : n;
355 static inline struct neighbour *
356 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
357 struct net_device *dev)
359 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
361 if (n)
362 return n;
364 return neigh_create(tbl, pkey, dev);
367 struct neighbour_cb {
368 unsigned long sched_next;
369 unsigned int flags;
372 #define LOCALLY_ENQUEUED 0x1
374 #define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
376 #endif
377 #endif