~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/net/neighbour.h

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 <linux/workqueue.h>
 28 #include <net/rtnetlink.h>
 29 
 30 /*
 31  * NUD stands for "neighbor unreachability detection"
 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 
 38 struct neighbour;
 39 
 40 struct 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;
 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 
 72 struct neigh_statistics {
 73         unsigned long allocs;           /* number of allocated neighs */
 74         unsigned long destroys;         /* number of destroyed neighs */
 75         unsigned long hash_grows;       /* number of hash resizes */
 76 
 77         unsigned long res_failed;       /* number of failed resolutions */
 78 
 79         unsigned long lookups;          /* number of lookups */
 80         unsigned long hits;             /* number of hits (among lookups) */
 81 
 82         unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
 83         unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
 84 
 85         unsigned long periodic_gc_runs; /* number of periodic GC runs */
 86         unsigned long forced_gc_runs;   /* number of forced GC runs */
 87 
 88         unsigned long unres_discards;   /* number of unresolved drops */
 89 };
 90 
 91 #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
 92 
 93 struct 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         struct timer_list       timer;
103         unsigned long           used;
104         atomic_t                probes;
105         __u8                    flags;
106         __u8                    nud_state;
107         __u8                    type;
108         __u8                    dead;
109         seqlock_t               ha_lock;
110         unsigned char           ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
111         struct hh_cache         *hh;
112         int                     (*output)(struct sk_buff *skb);
113         const struct neigh_ops  *ops;
114         struct rcu_head         rcu;
115         struct net_device       *dev;
116         u8                      primary_key[0];
117 };
118 
119 struct neigh_ops {
120         int                     family;
121         void                    (*solicit)(struct neighbour *, struct sk_buff*);
122         void                    (*error_report)(struct neighbour *, struct sk_buff*);
123         int                     (*output)(struct sk_buff*);
124         int                     (*connected_output)(struct sk_buff*);
125         int                     (*hh_output)(struct sk_buff*);
126         int                     (*queue_xmit)(struct sk_buff*);
127 };
128 
129 struct pneigh_entry {
130         struct pneigh_entry     *next;
131 #ifdef CONFIG_NET_NS
132         struct net              *net;
133 #endif
134         struct net_device       *dev;
135         u8                      flags;
136         u8                      key[0];
137 };
138 
139 /*
140  *      neighbour table manipulation
141  */
142 
143 struct neigh_hash_table {
144         struct neighbour __rcu  **hash_buckets;
145         unsigned int            hash_mask;
146         __u32                   hash_rnd;
147         struct rcu_head         rcu;
148 };
149 
150 
151 struct neigh_table {
152         struct neigh_table      *next;
153         int                     family;
154         int                     entry_size;
155         int                     key_len;
156         __u32                   (*hash)(const void *pkey,
157                                         const struct net_device *dev,
158                                         __u32 hash_rnd);
159         int                     (*constructor)(struct neighbour *);
160         int                     (*pconstructor)(struct pneigh_entry *);
161         void                    (*pdestructor)(struct pneigh_entry *);
162         void                    (*proxy_redo)(struct sk_buff *skb);
163         char                    *id;
164         struct neigh_parms      parms;
165         /* HACK. gc_* should follow parms without a gap! */
166         int                     gc_interval;
167         int                     gc_thresh1;
168         int                     gc_thresh2;
169         int                     gc_thresh3;
170         unsigned long           last_flush;
171         struct delayed_work     gc_work;
172         struct timer_list       proxy_timer;
173         struct sk_buff_head     proxy_queue;
174         atomic_t                entries;
175         rwlock_t                lock;
176         unsigned long           last_rand;
177         struct kmem_cache       *kmem_cachep;
178         struct neigh_statistics __percpu *stats;
179         struct neigh_hash_table __rcu *nht;
180         struct pneigh_entry     **phash_buckets;
181 };
182 
183 /* flags for neigh_update() */
184 #define NEIGH_UPDATE_F_OVERRIDE                 0x00000001
185 #define NEIGH_UPDATE_F_WEAK_OVERRIDE            0x00000002
186 #define NEIGH_UPDATE_F_OVERRIDE_ISROUTER        0x00000004
187 #define NEIGH_UPDATE_F_ISROUTER                 0x40000000
188 #define NEIGH_UPDATE_F_ADMIN                    0x80000000
189 
190 extern void                     neigh_table_init(struct neigh_table *tbl);
191 extern void                     neigh_table_init_no_netlink(struct neigh_table *tbl);
192 extern int                      neigh_table_clear(struct neigh_table *tbl);
193 extern struct neighbour *       neigh_lookup(struct neigh_table *tbl,
194                                              const void *pkey,
195                                              struct net_device *dev);
196 extern struct neighbour *       neigh_lookup_nodev(struct neigh_table *tbl,
197                                                    struct net *net,
198                                                    const void *pkey);
199 extern struct neighbour *       neigh_create(struct neigh_table *tbl,
200                                              const void *pkey,
201                                              struct net_device *dev);
202 extern void                     neigh_destroy(struct neighbour *neigh);
203 extern int                      __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
204 extern int                      neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 
205                                              u32 flags);
206 extern void                     neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
207 extern int                      neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
208 extern int                      neigh_resolve_output(struct sk_buff *skb);
209 extern int                      neigh_connected_output(struct sk_buff *skb);
210 extern int                      neigh_compat_output(struct sk_buff *skb);
211 extern struct neighbour         *neigh_event_ns(struct neigh_table *tbl,
212                                                 u8 *lladdr, void *saddr,
213                                                 struct net_device *dev);
214 
215 extern struct neigh_parms       *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
216 extern void                     neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
217 
218 static inline
219 struct net                      *neigh_parms_net(const struct neigh_parms *parms)
220 {
221         return read_pnet(&parms->net);
222 }
223 
224 extern unsigned long            neigh_rand_reach_time(unsigned long base);
225 
226 extern void                     pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
227                                                struct sk_buff *skb);
228 extern struct pneigh_entry      *pneigh_lookup(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev, int creat);
229 extern struct pneigh_entry      *__pneigh_lookup(struct neigh_table *tbl,
230                                                  struct net *net,
231                                                  const void *key,
232                                                  struct net_device *dev);
233 extern int                      pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);
234 
235 static inline
236 struct net                      *pneigh_net(const struct pneigh_entry *pneigh)
237 {
238         return read_pnet(&pneigh->net);
239 }
240 
241 extern void neigh_app_ns(struct neighbour *n);
242 extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
243 extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
244 extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));
245 
246 struct neigh_seq_state {
247         struct seq_net_private p;
248         struct neigh_table *tbl;
249         struct neigh_hash_table *nht;
250         void *(*neigh_sub_iter)(struct neigh_seq_state *state,
251                                 struct neighbour *n, loff_t *pos);
252         unsigned int bucket;
253         unsigned int flags;
254 #define NEIGH_SEQ_NEIGH_ONLY    0x00000001
255 #define NEIGH_SEQ_IS_PNEIGH     0x00000002
256 #define NEIGH_SEQ_SKIP_NOARP    0x00000004
257 };
258 extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
259 extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
260 extern void neigh_seq_stop(struct seq_file *, void *);
261 
262 extern int                      neigh_sysctl_register(struct net_device *dev, 
263                                                       struct neigh_parms *p,
264                                                       char *p_name,
265                                                       proc_handler *proc_handler);
266 extern void                     neigh_sysctl_unregister(struct neigh_parms *p);
267 
268 static inline void __neigh_parms_put(struct neigh_parms *parms)
269 {
270         atomic_dec(&parms->refcnt);
271 }
272 
273 static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
274 {
275         atomic_inc(&parms->refcnt);
276         return parms;
277 }
278 
279 /*
280  *      Neighbour references
281  */
282 
283 static inline void neigh_release(struct neighbour *neigh)
284 {
285         if (atomic_dec_and_test(&neigh->refcnt))
286                 neigh_destroy(neigh);
287 }
288 
289 static inline struct neighbour * neigh_clone(struct neighbour *neigh)
290 {
291         if (neigh)
292                 atomic_inc(&neigh->refcnt);
293         return neigh;
294 }
295 
296 #define neigh_hold(n)   atomic_inc(&(n)->refcnt)
297 
298 static inline void neigh_confirm(struct neighbour *neigh)
299 {
300         if (neigh)
301                 neigh->confirmed = jiffies;
302 }
303 
304 static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
305 {
306         unsigned long now = jiffies;
307         
308         if (neigh->used != now)
309                 neigh->used = now;
310         if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
311                 return __neigh_event_send(neigh, skb);
312         return 0;
313 }
314 
315 #ifdef CONFIG_BRIDGE_NETFILTER
316 static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
317 {
318         unsigned seq, hh_alen;
319 
320         do {
321                 seq = read_seqbegin(&hh->hh_lock);
322                 hh_alen = HH_DATA_ALIGN(ETH_HLEN);
323                 memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
324         } while (read_seqretry(&hh->hh_lock, seq));
325         return 0;
326 }
327 #endif
328 
329 static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
330 {
331         unsigned seq;
332         int hh_len;
333 
334         do {
335                 int hh_alen;
336 
337                 seq = read_seqbegin(&hh->hh_lock);
338                 hh_len = hh->hh_len;
339                 hh_alen = HH_DATA_ALIGN(hh_len);
340                 memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
341         } while (read_seqretry(&hh->hh_lock, seq));
342 
343         skb_push(skb, hh_len);
344         return hh->hh_output(skb);
345 }
346 
347 static inline struct neighbour *
348 __neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
349 {
350         struct neighbour *n = neigh_lookup(tbl, pkey, dev);
351 
352         if (n || !creat)
353                 return n;
354 
355         n = neigh_create(tbl, pkey, dev);
356         return IS_ERR(n) ? NULL : n;
357 }
358 
359 static inline struct neighbour *
360 __neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
361   struct net_device *dev)
362 {
363         struct neighbour *n = neigh_lookup(tbl, pkey, dev);
364 
365         if (n)
366                 return n;
367 
368         return neigh_create(tbl, pkey, dev);
369 }
370 
371 struct neighbour_cb {
372         unsigned long sched_next;
373         unsigned int flags;
374 };
375 
376 #define LOCALLY_ENQUEUED 0x1
377 
378 #define NEIGH_CB(skb)   ((struct neighbour_cb *)(skb)->cb)
379 
380 static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
381                                      const struct net_device *dev)
382 {
383         unsigned int seq;
384 
385         do {
386                 seq = read_seqbegin(&n->ha_lock);
387                 memcpy(dst, n->ha, dev->addr_len);
388         } while (read_seqretry(&n->ha_lock, seq));
389 }
390 #endif
391 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp