1#ifndef _NET_NEIGHBOUR_H
2#define _NET_NEIGHBOUR_H
3
4#include <linux/neighbour.h>
5
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18
19#include <linux/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 <linux/workqueue.h>
28#include <net/rtnetlink.h>
29
30
31
32
33
34#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
35#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
36#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
37
38struct neighbour;
39
40struct neigh_parms {
41#ifdef CONFIG_NET_NS
42 struct net *net;
43#endif
44 struct net_device *dev;
45 struct neigh_parms *next;
46 int (*neigh_setup)(struct neighbour *);
47 void (*neigh_cleanup)(struct neighbour *);
48 struct neigh_table *tbl;
49
50 void *sysctl_table;
51
52 int dead;
53 atomic_t refcnt;
54 struct rcu_head rcu_head;
55
56 int base_reachable_time;
57 int retrans_time;
58 int gc_staletime;
59 int reachable_time;
60 int delay_probe_time;
61
62 int queue_len_bytes;
63 int ucast_probes;
64 int app_probes;
65 int mcast_probes;
66 int anycast_delay;
67 int proxy_delay;
68 int proxy_qlen;
69 int locktime;
70};
71
72struct neigh_statistics {
73 unsigned long allocs;
74 unsigned long destroys;
75 unsigned long hash_grows;
76
77 unsigned long res_failed;
78
79 unsigned long lookups;
80 unsigned long hits;
81
82 unsigned long rcv_probes_mcast;
83 unsigned long rcv_probes_ucast;
84
85 unsigned long periodic_gc_runs;
86 unsigned long forced_gc_runs;
87
88 unsigned long unres_discards;
89};
90
91#define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
92
93struct neighbour {
94 struct neighbour __rcu *next;
95 struct neigh_table *tbl;
96 struct neigh_parms *parms;
97 unsigned long confirmed;
98 unsigned long updated;
99 rwlock_t lock;
100 atomic_t refcnt;
101 struct sk_buff_head arp_queue;
102 unsigned int arp_queue_len_bytes;
103 struct timer_list timer;
104 unsigned long used;
105 atomic_t probes;
106 __u8 flags;
107 __u8 nud_state;
108 __u8 type;
109 __u8 dead;
110 seqlock_t ha_lock;
111 unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
112 struct hh_cache hh;
113 int (*output)(struct neighbour *, struct sk_buff *);
114 const struct neigh_ops *ops;
115 struct rcu_head rcu;
116 struct net_device *dev;
117 u8 primary_key[0];
118};
119
120struct neigh_ops {
121 int family;
122 void (*solicit)(struct neighbour *, struct sk_buff *);
123 void (*error_report)(struct neighbour *, struct sk_buff *);
124 int (*output)(struct neighbour *, struct sk_buff *);
125 int (*connected_output)(struct neighbour *, struct sk_buff *);
126};
127
128struct pneigh_entry {
129 struct pneigh_entry *next;
130#ifdef CONFIG_NET_NS
131 struct net *net;
132#endif
133 struct net_device *dev;
134 u8 flags;
135 u8 key[0];
136};
137
138
139
140
141
142#define NEIGH_NUM_HASH_RND 4
143
144struct neigh_hash_table {
145 struct neighbour __rcu **hash_buckets;
146 unsigned int hash_shift;
147 __u32 hash_rnd[NEIGH_NUM_HASH_RND];
148 struct rcu_head rcu;
149};
150
151
152struct neigh_table {
153 struct neigh_table *next;
154 int family;
155 int entry_size;
156 int key_len;
157 __u32 (*hash)(const void *pkey,
158 const struct net_device *dev,
159 __u32 *hash_rnd);
160 int (*constructor)(struct neighbour *);
161 int (*pconstructor)(struct pneigh_entry *);
162 void (*pdestructor)(struct pneigh_entry *);
163 void (*proxy_redo)(struct sk_buff *skb);
164 char *id;
165 struct neigh_parms parms;
166
167 int gc_interval;
168 int gc_thresh1;
169 int gc_thresh2;
170 int gc_thresh3;
171 unsigned long last_flush;
172 struct delayed_work gc_work;
173 struct timer_list proxy_timer;
174 struct sk_buff_head proxy_queue;
175 atomic_t entries;
176 rwlock_t lock;
177 unsigned long last_rand;
178 struct neigh_statistics __percpu *stats;
179 struct neigh_hash_table __rcu *nht;
180 struct pneigh_entry **phash_buckets;
181};
182
183#define NEIGH_PRIV_ALIGN sizeof(long long)
184#define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN)
185
186static inline void *neighbour_priv(const struct neighbour *n)
187{
188 return (char *)n + n->tbl->entry_size;
189}
190
191
192#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
193#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
194#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
195#define NEIGH_UPDATE_F_ISROUTER 0x40000000
196#define NEIGH_UPDATE_F_ADMIN 0x80000000
197
198void neigh_table_init(struct neigh_table *tbl);
199int neigh_table_clear(struct neigh_table *tbl);
200struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
201 struct net_device *dev);
202struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net,
203 const void *pkey);
204struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey,
205 struct net_device *dev, bool want_ref);
206static inline struct neighbour *neigh_create(struct neigh_table *tbl,
207 const void *pkey,
208 struct net_device *dev)
209{
210 return __neigh_create(tbl, pkey, dev, true);
211}
212void neigh_destroy(struct neighbour *neigh);
213int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
214int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags);
215void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
216int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
217int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb);
218int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb);
219int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb);
220int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb);
221struct neighbour *neigh_event_ns(struct neigh_table *tbl,
222 u8 *lladdr, void *saddr,
223 struct net_device *dev);
224
225struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
226 struct neigh_table *tbl);
227void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
228
229static inline
230struct net *neigh_parms_net(const struct neigh_parms *parms)
231{
232 return read_pnet(&parms->net);
233}
234
235unsigned long neigh_rand_reach_time(unsigned long base);
236
237void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
238 struct sk_buff *skb);
239struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net,
240 const void *key, struct net_device *dev,
241 int creat);
242struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net,
243 const void *key, struct net_device *dev);
244int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key,
245 struct net_device *dev);
246
247static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
248{
249 return read_pnet(&pneigh->net);
250}
251
252void neigh_app_ns(struct neighbour *n);
253void neigh_for_each(struct neigh_table *tbl,
254 void (*cb)(struct neighbour *, void *), void *cookie);
255void __neigh_for_each_release(struct neigh_table *tbl,
256 int (*cb)(struct neighbour *));
257void pneigh_for_each(struct neigh_table *tbl,
258 void (*cb)(struct pneigh_entry *));
259
260struct neigh_seq_state {
261 struct seq_net_private p;
262 struct neigh_table *tbl;
263 struct neigh_hash_table *nht;
264 void *(*neigh_sub_iter)(struct neigh_seq_state *state,
265 struct neighbour *n, loff_t *pos);
266 unsigned int bucket;
267 unsigned int flags;
268#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
269#define NEIGH_SEQ_IS_PNEIGH 0x00000002
270#define NEIGH_SEQ_SKIP_NOARP 0x00000004
271};
272void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *,
273 unsigned int);
274void *neigh_seq_next(struct seq_file *, void *, loff_t *);
275void neigh_seq_stop(struct seq_file *, void *);
276
277int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
278 char *p_name, proc_handler *proc_handler);
279void neigh_sysctl_unregister(struct neigh_parms *p);
280
281static inline void __neigh_parms_put(struct neigh_parms *parms)
282{
283 atomic_dec(&parms->refcnt);
284}
285
286static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
287{
288 atomic_inc(&parms->refcnt);
289 return parms;
290}
291
292
293
294
295
296static inline void neigh_release(struct neighbour *neigh)
297{
298 if (atomic_dec_and_test(&neigh->refcnt))
299 neigh_destroy(neigh);
300}
301
302static inline struct neighbour * neigh_clone(struct neighbour *neigh)
303{
304 if (neigh)
305 atomic_inc(&neigh->refcnt);
306 return neigh;
307}
308
309#define neigh_hold(n) atomic_inc(&(n)->refcnt)
310
311static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
312{
313 unsigned long now = jiffies;
314
315 if (neigh->used != now)
316 neigh->used = now;
317 if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
318 return __neigh_event_send(neigh, skb);
319 return 0;
320}
321
322#ifdef CONFIG_BRIDGE_NETFILTER
323static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
324{
325 unsigned int seq, hh_alen;
326
327 do {
328 seq = read_seqbegin(&hh->hh_lock);
329 hh_alen = HH_DATA_ALIGN(ETH_HLEN);
330 memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
331 } while (read_seqretry(&hh->hh_lock, seq));
332 return 0;
333}
334#endif
335
336static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
337{
338 unsigned int seq;
339 int hh_len;
340
341 do {
342 seq = read_seqbegin(&hh->hh_lock);
343 hh_len = hh->hh_len;
344 if (likely(hh_len <= HH_DATA_MOD)) {
345
346 memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
347 } else {
348 int hh_alen = HH_DATA_ALIGN(hh_len);
349
350 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
351 }
352 } while (read_seqretry(&hh->hh_lock, seq));
353
354 skb_push(skb, hh_len);
355 return dev_queue_xmit(skb);
356}
357
358static inline struct neighbour *
359__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
360{
361 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
362
363 if (n || !creat)
364 return n;
365
366 n = neigh_create(tbl, pkey, dev);
367 return IS_ERR(n) ? NULL : n;
368}
369
370static inline struct neighbour *
371__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
372 struct net_device *dev)
373{
374 struct neighbour *n = neigh_lookup(tbl, pkey, dev);
375
376 if (n)
377 return n;
378
379 return neigh_create(tbl, pkey, dev);
380}
381
382struct neighbour_cb {
383 unsigned long sched_next;
384 unsigned int flags;
385};
386
387#define LOCALLY_ENQUEUED 0x1
388
389#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
390
391static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
392 const struct net_device *dev)
393{
394 unsigned int seq;
395
396 do {
397 seq = read_seqbegin(&n->ha_lock);
398 memcpy(dst, n->ha, dev->addr_len);
399 } while (read_seqretry(&n->ha_lock, seq));
400}
401#endif
402
