[NET]: Use local_irq_{save,restore}() in napi_complete().
[linux-2.6.git] / include / net / neighbour.h
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