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
12 /* The following flags & states are exported to user space,
13 so that they should be moved to include/linux/ directory.
14 */
15
16 /*
17 * Neighbor Cache Entry Flags
18 */
19
20 #define NTF_PROXY 0x08 /* == ATF_PUBL */
21 #define NTF_ROUTER 0x80
22
23 /*
24 * Neighbor Cache Entry States.
25 */
26
27 #define NUD_INCOMPLETE 0x01
28 #define NUD_REACHABLE 0x02
29 #define NUD_STALE 0x04
30 #define NUD_DELAY 0x08
31 #define NUD_PROBE 0x10
32 #define NUD_FAILED 0x20
33
34 /* Dummy states */
35 #define NUD_NOARP 0x40
36 #define NUD_PERMANENT 0x80
37 #define NUD_NONE 0x00
38
39 /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
40 and make no address resolution or NUD.
41 NUD_PERMANENT is also cannot be deleted by garbage collectors.
42 */
43
44 #ifdef __KERNEL__
45
46 #include <asm/atomic.h>
47 #include <linux/skbuff.h>
48
49 #define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE)
50 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
51 #define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
52
53 struct neigh_parms
54 {
55 struct neigh_parms *next;
56 int (*neigh_setup)(struct neighbour *);
57 struct neigh_table *tbl;
58 int entries;
59 void *priv;
60
61 void *sysctl_table;
62
63 int base_reachable_time;
64 int retrans_time;
65 int gc_staletime;
66 int reachable_time;
67 int delay_probe_time;
68
69 int queue_len;
70 int ucast_probes;
71 int app_probes;
72 int mcast_probes;
73 int anycast_delay;
74 int proxy_delay;
75 int proxy_qlen;
76 int locktime;
77 };
78
79 struct neigh_statistics
80 {
81 unsigned long allocs;
82 unsigned long res_failed;
83 unsigned long rcv_probes_mcast;
84 unsigned long rcv_probes_ucast;
85 };
86
87 struct neighbour
88 {
89 struct neighbour *next;
90 struct neigh_table *tbl;
91 struct neigh_parms *parms;
92 struct net_device *dev;
93 unsigned long used;
94 unsigned long confirmed;
95 unsigned long updated;
96 __u8 flags;
97 __u8 nud_state;
98 __u8 type;
99 __u8 dead;
100 atomic_t probes;
101 rwlock_t lock;
102 unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
103 struct hh_cache *hh;
104 atomic_t refcnt;
105 int (*output)(struct sk_buff *skb);
106 struct sk_buff_head arp_queue;
107 struct timer_list timer;
108 struct neigh_ops *ops;
109 u8 primary_key[0];
110 };
111
112 struct neigh_ops
113 {
114 int family;
115 void (*destructor)(struct neighbour *);
116 void (*solicit)(struct neighbour *, struct sk_buff*);
117 void (*error_report)(struct neighbour *, struct sk_buff*);
118 int (*output)(struct sk_buff*);
119 int (*connected_output)(struct sk_buff*);
120 int (*hh_output)(struct sk_buff*);
121 int (*queue_xmit)(struct sk_buff*);
122 };
123
124 struct pneigh_entry
125 {
126 struct pneigh_entry *next;
127 struct net_device *dev;
128 u8 key[0];
129 };
130
131 #define NEIGH_HASHMASK 0x1F
132 #define PNEIGH_HASHMASK 0xF
133
134 /*
135 * neighbour table manipulation
136 */
137
138
139 struct neigh_table
140 {
141 struct neigh_table *next;
142 int family;
143 int entry_size;
144 int key_len;
145 __u32 (*hash)(const void *pkey, const struct net_device *);
146 int (*constructor)(struct neighbour *);
147 int (*pconstructor)(struct pneigh_entry *);
148 void (*pdestructor)(struct pneigh_entry *);
149 void (*proxy_redo)(struct sk_buff *skb);
150 char *id;
151 struct neigh_parms parms;
152 /* HACK. gc_* shoul follow parms without a gap! */
153 int gc_interval;
154 int gc_thresh1;
155 int gc_thresh2;
156 int gc_thresh3;
157 unsigned long last_flush;
158 struct timer_list gc_timer;
159 struct timer_list proxy_timer;
160 struct sk_buff_head proxy_queue;
161 int entries;
162 rwlock_t lock;
163 unsigned long last_rand;
164 struct neigh_parms *parms_list;
165 kmem_cache_t *kmem_cachep;
166 struct tasklet_struct gc_task;
167 struct neigh_statistics stats;
168 struct neighbour *hash_buckets[NEIGH_HASHMASK+1];
169 struct pneigh_entry *phash_buckets[PNEIGH_HASHMASK+1];
170 };
171
172 extern void neigh_table_init(struct neigh_table *tbl);
173 extern int neigh_table_clear(struct neigh_table *tbl);
174 extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
175 const void *pkey,
176 struct net_device *dev);
177 extern struct neighbour * neigh_create(struct neigh_table *tbl,
178 const void *pkey,
179 struct net_device *dev);
180 extern void neigh_destroy(struct neighbour *neigh);
181 extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
182 extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp);
183 extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
184 extern int neigh_resolve_output(struct sk_buff *skb);
185 extern int neigh_connected_output(struct sk_buff *skb);
186 extern int neigh_compat_output(struct sk_buff *skb);
187 extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
188 u8 *lladdr, void *saddr,
189 struct net_device *dev);
190
191 extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
192 extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
193 extern unsigned long neigh_rand_reach_time(unsigned long base);
194
195 extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
196 struct sk_buff *skb);
197 extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
198 extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
199
200 struct netlink_callback;
201 struct nlmsghdr;
202 extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
203 extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
204 extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
205 extern void neigh_app_ns(struct neighbour *n);
206
207 extern int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
208 int p_id, int pdev_id, char *p_name);
209 extern void neigh_sysctl_unregister(struct neigh_parms *p);
210
211 /*
212 * Neighbour references
213 */
214
215 static inline void neigh_release(struct neighbour *neigh)
216 {
217 if (atomic_dec_and_test(&neigh->refcnt))
218 neigh_destroy(neigh);
219 }
220
221 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
222 {
223 if (neigh)
224 atomic_inc(&neigh->refcnt);
225 return neigh;
226 }
227
228 #define neigh_hold(n) atomic_inc(&(n)->refcnt)
229
230 static inline void neigh_confirm(struct neighbour *neigh)
231 {
232 if (neigh)
233 neigh->confirmed = jiffies;
234 }
235
236 static inline int neigh_is_connected(struct neighbour *neigh)
237 {
238 return neigh->nud_state&NUD_CONNECTED;
239 }
240
241 static inline int neigh_is_valid(struct neighbour *neigh)
242 {
243 return neigh->nud_state&NUD_VALID;
244 }
245
246 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
247 {
248 neigh->used = jiffies;
249 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
250 return __neigh_event_send(neigh, skb);
251 return 0;
252 }
253
254 static inline struct neighbour *
255 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
256 {
257 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
258
259 if (n || !creat)
260 return n;
261
262 n = neigh_create(tbl, pkey, dev);
263 return IS_ERR(n) ? NULL : n;
264 }
265
266 static inline struct neighbour *
267 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
268 struct net_device *dev)
269 {
270 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
271
272 if (n)
273 return n;
274
275 return neigh_create(tbl, pkey, dev);
276 }
277
278 #endif
279 #endif
280
281
282
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