[net-next-2.6.git] / include / net / neighbour.h

#ifndef _NET_NEIGHBOUR_H
#define _NET_NEIGHBOUR_H

#include <linux/neighbour.h>

/*
 *	Generic neighbour manipulation
 *
 *	Authors:
 *	Pedro Roque		<roque@di.fc.ul.pt>
 *	Alexey Kuznetsov	<kuznet@ms2.inr.ac.ru>
 *
 * 	Changes:
 *
 *	Harald Welte:		<laforge@gnumonks.org>
 *		- Add neighbour cache statistics like rtstat
 */

#include <asm/atomic.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>

#include <linux/err.h>
#include <linux/sysctl.h>
#include <net/rtnetlink.h>

#define NUD_IN_TIMER	(NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
#define NUD_VALID	(NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
#define NUD_CONNECTED	(NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)

struct neighbour;

struct neigh_parms
{
	struct net_device *dev;
	struct neigh_parms *next;
	int	(*neigh_setup)(struct neighbour *);
	void	(*neigh_cleanup)(struct neighbour *);
	struct neigh_table *tbl;

	void	*sysctl_table;

	int dead;
	atomic_t refcnt;
	struct rcu_head rcu_head;

	int	base_reachable_time;
	int	retrans_time;
	int	gc_staletime;
	int	reachable_time;
	int	delay_probe_time;

	int	queue_len;
	int	ucast_probes;
	int	app_probes;
	int	mcast_probes;
	int	anycast_delay;
	int	proxy_delay;
	int	proxy_qlen;
	int	locktime;
};

struct neigh_statistics
{
	unsigned long allocs;		/* number of allocated neighs */
	unsigned long destroys;		/* number of destroyed neighs */
	unsigned long hash_grows;	/* number of hash resizes */

	unsigned long res_failed;	/* nomber of failed resolutions */

	unsigned long lookups;		/* number of lookups */
	unsigned long hits;		/* number of hits (among lookups) */

	unsigned long rcv_probes_mcast;	/* number of received mcast ipv6 */
	unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */

	unsigned long periodic_gc_runs;	/* number of periodic GC runs */
	unsigned long forced_gc_runs;	/* number of forced GC runs */
};

#define NEIGH_CACHE_STAT_INC(tbl, field)				\
	do {								\
		preempt_disable();					\
		(per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
		preempt_enable();					\
	} while (0)

struct neighbour
{
	struct neighbour	*next;
	struct neigh_table	*tbl;
	struct neigh_parms	*parms;
	struct net_device		*dev;
	unsigned long		used;
	unsigned long		confirmed;
	unsigned long		updated;
	__u8			flags;
	__u8			nud_state;
	__u8			type;
	__u8			dead;
	atomic_t		probes;
	rwlock_t		lock;
	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
	struct hh_cache		*hh;
	atomic_t		refcnt;
	int			(*output)(struct sk_buff *skb);
	struct sk_buff_head	arp_queue;
	struct timer_list	timer;
	struct neigh_ops	*ops;
	u8			primary_key[0];
};

struct neigh_ops
{
	int			family;
	void			(*solicit)(struct neighbour *, struct sk_buff*);
	void			(*error_report)(struct neighbour *, struct sk_buff*);
	int			(*output)(struct sk_buff*);
	int			(*connected_output)(struct sk_buff*);
	int			(*hh_output)(struct sk_buff*);
	int			(*queue_xmit)(struct sk_buff*);
};

struct pneigh_entry
{
	struct pneigh_entry	*next;
	struct net_device		*dev;
	u8			flags;
	u8			key[0];
};

/*
 *	neighbour table manipulation
 */


struct neigh_table
{
	struct neigh_table	*next;
	int			family;
	int			entry_size;
	int			key_len;
	__u32			(*hash)(const void *pkey, const struct net_device *);
	int			(*constructor)(struct neighbour *);
	int			(*pconstructor)(struct pneigh_entry *);
	void			(*pdestructor)(struct pneigh_entry *);
	void			(*proxy_redo)(struct sk_buff *skb);
	char			*id;
	struct neigh_parms	parms;
	/* HACK. gc_* shoul follow parms without a gap! */
	int			gc_interval;
	int			gc_thresh1;
	int			gc_thresh2;
	int			gc_thresh3;
	unsigned long		last_flush;
	struct timer_list 	gc_timer;
	struct timer_list 	proxy_timer;
	struct sk_buff_head	proxy_queue;
	atomic_t		entries;
	rwlock_t		lock;
	unsigned long		last_rand;
	struct kmem_cache		*kmem_cachep;
	struct neigh_statistics	*stats;
	struct neighbour	**hash_buckets;
	unsigned int		hash_mask;
	__u32			hash_rnd;
	unsigned int		hash_chain_gc;
	struct pneigh_entry	**phash_buckets;
#ifdef CONFIG_PROC_FS
	struct proc_dir_entry	*pde;
#endif
};

/* flags for neigh_update() */
#define NEIGH_UPDATE_F_OVERRIDE			0x00000001
#define NEIGH_UPDATE_F_WEAK_OVERRIDE		0x00000002
#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER	0x00000004
#define NEIGH_UPDATE_F_ISROUTER			0x40000000
#define NEIGH_UPDATE_F_ADMIN			0x80000000

extern void			neigh_table_init(struct neigh_table *tbl);
extern void			neigh_table_init_no_netlink(struct neigh_table *tbl);
extern int			neigh_table_clear(struct neigh_table *tbl);
extern struct neighbour *	neigh_lookup(struct neigh_table *tbl,
					     const void *pkey,
					     struct net_device *dev);
extern struct neighbour *	neigh_lookup_nodev(struct neigh_table *tbl,
						   const void *pkey);
extern struct neighbour *	neigh_create(struct neigh_table *tbl,
					     const void *pkey,
					     struct net_device *dev);
extern void			neigh_destroy(struct neighbour *neigh);
extern int			__neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
extern int			neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, 
					     u32 flags);
extern void			neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
extern int			neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
extern int			neigh_resolve_output(struct sk_buff *skb);
extern int			neigh_connected_output(struct sk_buff *skb);
extern int			neigh_compat_output(struct sk_buff *skb);
extern struct neighbour 	*neigh_event_ns(struct neigh_table *tbl,
						u8 *lladdr, void *saddr,
						struct net_device *dev);

extern struct neigh_parms	*neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
extern void			neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
extern void			neigh_parms_destroy(struct neigh_parms *parms);
extern unsigned long		neigh_rand_reach_time(unsigned long base);

extern void			pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
					       struct sk_buff *skb);
extern struct pneigh_entry	*pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
extern int			pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);

extern void neigh_app_ns(struct neighbour *n);
extern void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie);
extern void __neigh_for_each_release(struct neigh_table *tbl, int (*cb)(struct neighbour *));
extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_entry *));

struct neigh_seq_state {
	struct neigh_table *tbl;
	void *(*neigh_sub_iter)(struct neigh_seq_state *state,
				struct neighbour *n, loff_t *pos);
	unsigned int bucket;
	unsigned int flags;
#define NEIGH_SEQ_NEIGH_ONLY	0x00000001
#define NEIGH_SEQ_IS_PNEIGH	0x00000002
#define NEIGH_SEQ_SKIP_NOARP	0x00000004
};
extern void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *, unsigned int);
extern void *neigh_seq_next(struct seq_file *, void *, loff_t *);
extern void neigh_seq_stop(struct seq_file *, void *);

extern int			neigh_sysctl_register(struct net_device *dev, 
						      struct neigh_parms *p,
						      int p_id, int pdev_id,
						      char *p_name,
						      proc_handler *proc_handler,
						      ctl_handler *strategy);
extern void			neigh_sysctl_unregister(struct neigh_parms *p);

static inline void __neigh_parms_put(struct neigh_parms *parms)
{
	atomic_dec(&parms->refcnt);
}

static inline void neigh_parms_put(struct neigh_parms *parms)
{
	if (atomic_dec_and_test(&parms->refcnt))
		neigh_parms_destroy(parms);
}

static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
{
	atomic_inc(&parms->refcnt);
	return parms;
}

/*
 *	Neighbour references
 */

static inline void neigh_release(struct neighbour *neigh)
{
	if (atomic_dec_and_test(&neigh->refcnt))
		neigh_destroy(neigh);
}

static inline struct neighbour * neigh_clone(struct neighbour *neigh)
{
	if (neigh)
		atomic_inc(&neigh->refcnt);
	return neigh;
}

#define neigh_hold(n)	atomic_inc(&(n)->refcnt)

static inline void neigh_confirm(struct neighbour *neigh)
{
	if (neigh)
		neigh->confirmed = jiffies;
}

static inline int neigh_is_connected(struct neighbour *neigh)
{
	return neigh->nud_state&NUD_CONNECTED;
}

static inline int neigh_is_valid(struct neighbour *neigh)
{
	return neigh->nud_state&NUD_VALID;
}

static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
{
	neigh->used = jiffies;
	if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
		return __neigh_event_send(neigh, skb);
	return 0;
}

static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb)
{
	unsigned seq;
	int hh_len;

	do {
		int hh_alen;

		seq = read_seqbegin(&hh->hh_lock);
		hh_len = hh->hh_len;
		hh_alen = HH_DATA_ALIGN(hh_len);
		memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
	} while (read_seqretry(&hh->hh_lock, seq));

	skb_push(skb, hh_len);
	return hh->hh_output(skb);
}

static inline struct neighbour *
__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
{
	struct neighbour *n = neigh_lookup(tbl, pkey, dev);

	if (n || !creat)
		return n;

	n = neigh_create(tbl, pkey, dev);
	return IS_ERR(n) ? NULL : n;
}

static inline struct neighbour *
__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
  struct net_device *dev)
{
	struct neighbour *n = neigh_lookup(tbl, pkey, dev);

	if (n)
		return n;

	return neigh_create(tbl, pkey, dev);
}

struct neighbour_cb {
	unsigned long sched_next;
	unsigned int flags;
};

#define LOCALLY_ENQUEUED 0x1

#define NEIGH_CB(skb)	((struct neighbour_cb *)(skb)->cb)

#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _NET_NEIGHBOUR_H
	2	#define _NET_NEIGHBOUR_H
	3
9067c722 TG	4	#include <linux/neighbour.h>
9067c722 TG	5
1da177e4 LT	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
1da177e4	19	#include <asm/atomic.h>
1da177e4	20	#include <linux/netdevice.h>
14c85021	21	#include <linux/skbuff.h>
1da177e4 LT	22	#include <linux/rcupdate.h>
	23	#include <linux/seq_file.h>
	24
	25	#include <linux/err.h>
	26	#include <linux/sysctl.h>
c8822a4e	27	#include <net/rtnetlink.h>
1da177e4 LT	28
	29	#define NUD_IN_TIMER (NUD_INCOMPLETE\|NUD_REACHABLE\|NUD_DELAY\|NUD_PROBE)
	30	#define NUD_VALID (NUD_PERMANENT\|NUD_NOARP\|NUD_REACHABLE\|NUD_PROBE\|NUD_STALE\|NUD_DELAY)
	31	#define NUD_CONNECTED (NUD_PERMANENT\|NUD_NOARP\|NUD_REACHABLE)
	32
	33	struct neighbour;
	34
	35	struct neigh_parms
	36	{
c7fb64db	37	struct net_device *dev;
1da177e4 LT	38	struct neigh_parms *next;
1da177e4 LT	39	int (neigh_setup)(struct neighbour );
ecbb4169	40	void (neigh_cleanup)(struct neighbour );
1da177e4	41	struct neigh_table *tbl;
1da177e4 LT	42
	43	void *sysctl_table;
	44
	45	int dead;
	46	atomic_t refcnt;
	47	struct rcu_head rcu_head;
	48
	49	int base_reachable_time;
	50	int retrans_time;
	51	int gc_staletime;
	52	int reachable_time;
	53	int delay_probe_time;
	54
	55	int queue_len;
	56	int ucast_probes;
	57	int app_probes;
	58	int mcast_probes;
	59	int anycast_delay;
	60	int proxy_delay;
	61	int proxy_qlen;
	62	int locktime;
	63	};
	64
	65	struct neigh_statistics
	66	{
	67	unsigned long allocs; /* number of allocated neighs */
	68	unsigned long destroys; /* number of destroyed neighs */
	69	unsigned long hash_grows; /* number of hash resizes */
	70
	71	unsigned long res_failed; /* nomber of failed resolutions */
	72
	73	unsigned long lookups; /* number of lookups */
	74	unsigned long hits; /* number of hits (among lookups) */
	75
	76	unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
	77	unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
	78
	79	unsigned long periodic_gc_runs; /* number of periodic GC runs */
	80	unsigned long forced_gc_runs; /* number of forced GC runs */
	81	};
	82
	83	#define NEIGH_CACHE_STAT_INC(tbl, field) \
	84	do { \
	85	preempt_disable(); \
	86	(per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
	87	preempt_enable(); \
	88	} while (0)
	89
	90	struct neighbour
	91	{
	92	struct neighbour *next;
	93	struct neigh_table *tbl;
	94	struct neigh_parms *parms;
	95	struct net_device *dev;
	96	unsigned long used;
	97	unsigned long confirmed;
	98	unsigned long updated;
	99	__u8 flags;
	100	__u8 nud_state;
	101	__u8 type;
	102	__u8 dead;
	103	atomic_t probes;
	104	rwlock_t lock;
d924424a	105	unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
1da177e4 LT	106	struct hh_cache *hh;
	107	atomic_t refcnt;
	108	int (output)(struct sk_buff skb);
	109	struct sk_buff_head arp_queue;
	110	struct timer_list timer;
	111	struct neigh_ops *ops;
	112	u8 primary_key[0];
	113	};
	114
	115	struct neigh_ops
	116	{
	117	int family;
1da177e4 LT	118	void (solicit)(struct neighbour , struct sk_buff*);
	119	void (error_report)(struct neighbour , struct sk_buff*);
	120	int (output)(struct sk_buff);
	121	int (connected_output)(struct sk_buff);
	122	int (hh_output)(struct sk_buff);
	123	int (queue_xmit)(struct sk_buff);
	124	};
	125
	126	struct pneigh_entry
	127	{
	128	struct pneigh_entry *next;
	129	struct net_device *dev;
62dd9318	130	u8 flags;
1da177e4 LT	131	u8 key[0];
	132	};
	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	atomic_t entries;
	162	rwlock_t lock;
	163	unsigned long last_rand;
e18b890b	164	struct kmem_cache *kmem_cachep;
1da177e4 LT	165	struct neigh_statistics *stats;
	166	struct neighbour **hash_buckets;
	167	unsigned int hash_mask;
	168	__u32 hash_rnd;
	169	unsigned int hash_chain_gc;
	170	struct pneigh_entry **phash_buckets;
	171	#ifdef CONFIG_PROC_FS
	172	struct proc_dir_entry *pde;
	173	#endif
	174	};
	175
	176	/* flags for neigh_update() */
	177	#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
	178	#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
	179	#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
	180	#define NEIGH_UPDATE_F_ISROUTER 0x40000000
	181	#define NEIGH_UPDATE_F_ADMIN 0x80000000
	182
	183	extern void neigh_table_init(struct neigh_table *tbl);
bd89efc5	184	extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
1da177e4 LT	185	extern int neigh_table_clear(struct neigh_table *tbl);
	186	extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
	187	const void *pkey,
	188	struct net_device *dev);
	189	extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
	190	const void *pkey);
	191	extern struct neighbour * neigh_create(struct neigh_table *tbl,
	192	const void *pkey,
	193	struct net_device *dev);
	194	extern void neigh_destroy(struct neighbour *neigh);
	195	extern int __neigh_event_send(struct neighbour neigh, struct sk_buff skb);
	196	extern int neigh_update(struct neighbour neigh, const u8 lladdr, u8 new,
	197	u32 flags);
	198	extern void neigh_changeaddr(struct neigh_table tbl, struct net_device dev);
	199	extern int neigh_ifdown(struct neigh_table tbl, struct net_device dev);
	200	extern int neigh_resolve_output(struct sk_buff *skb);
	201	extern int neigh_connected_output(struct sk_buff *skb);
	202	extern int neigh_compat_output(struct sk_buff *skb);
	203	extern struct neighbour neigh_event_ns(struct neigh_table tbl,
	204	u8 lladdr, void saddr,
	205	struct net_device *dev);
	206
	207	extern struct neigh_parms neigh_parms_alloc(struct net_device dev, struct neigh_table *tbl);
	208	extern void neigh_parms_release(struct neigh_table tbl, struct neigh_parms parms);
	209	extern void neigh_parms_destroy(struct neigh_parms *parms);
	210	extern unsigned long neigh_rand_reach_time(unsigned long base);
	211
	212	extern void pneigh_enqueue(struct neigh_table tbl, struct neigh_parms p,
	213	struct sk_buff *skb);
	214	extern struct pneigh_entry pneigh_lookup(struct neigh_table tbl, const void key, struct net_device dev, int creat);
	215	extern int pneigh_delete(struct neigh_table tbl, const void key, struct net_device *dev);
	216
1da177e4	217	extern void neigh_app_ns(struct neighbour *n);
1da177e4 LT	218	extern void neigh_for_each(struct neigh_table tbl, void (cb)(struct neighbour , void ), void *cookie);
	219	extern void __neigh_for_each_release(struct neigh_table tbl, int (cb)(struct neighbour *));
	220	extern void pneigh_for_each(struct neigh_table tbl, void (cb)(struct pneigh_entry *));
	221
	222	struct neigh_seq_state {
	223	struct neigh_table *tbl;
	224	void (neigh_sub_iter)(struct neigh_seq_state *state,
	225	struct neighbour n, loff_t pos);
	226	unsigned int bucket;
	227	unsigned int flags;
	228	#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
	229	#define NEIGH_SEQ_IS_PNEIGH 0x00000002
	230	#define NEIGH_SEQ_SKIP_NOARP 0x00000004
	231	};
	232	extern void neigh_seq_start(struct seq_file , loff_t , struct neigh_table , unsigned int);
	233	extern void neigh_seq_next(struct seq_file , void , loff_t );
	234	extern void neigh_seq_stop(struct seq_file , void );
	235
	236	extern int neigh_sysctl_register(struct net_device *dev,
	237	struct neigh_parms *p,
	238	int p_id, int pdev_id,
	239	char *p_name,
	240	proc_handler *proc_handler,
	241	ctl_handler *strategy);
	242	extern void neigh_sysctl_unregister(struct neigh_parms *p);
	243
	244	static inline void __neigh_parms_put(struct neigh_parms *parms)
	245	{
	246	atomic_dec(&parms->refcnt);
	247	}
	248
	249	static inline void neigh_parms_put(struct neigh_parms *parms)
	250	{
	251	if (atomic_dec_and_test(&parms->refcnt))
	252	neigh_parms_destroy(parms);
	253	}
	254
	255	static inline struct neigh_parms neigh_parms_clone(struct neigh_parms parms)
	256	{
	257	atomic_inc(&parms->refcnt);
	258	return parms;
	259	}
	260
	261	/*
	262	* Neighbour references
	263	*/
	264
	265	static inline void neigh_release(struct neighbour *neigh)
	266	{
	267	if (atomic_dec_and_test(&neigh->refcnt))
	268	neigh_destroy(neigh);
	269	}
	270
	271	static inline struct neighbour * neigh_clone(struct neighbour *neigh)
	272	{
	273	if (neigh)
	274	atomic_inc(&neigh->refcnt);
	275	return neigh;
	276	}
	277
	278	#define neigh_hold(n) atomic_inc(&(n)->refcnt)
	279
	280	static inline void neigh_confirm(struct neighbour *neigh)
	281	{
282	if (neigh)
283	neigh->confirmed = jiffies;
284	}
285
286	static inline int neigh_is_connected(struct neighbour *neigh)
287	{
288	return neigh->nud_state&NUD_CONNECTED;
289	}
290
291	static inline int neigh_is_valid(struct neighbour *neigh)
292	{
293	return neigh->nud_state&NUD_VALID;
294	}
295
296	static inline int neigh_event_send(struct neighbour neigh, struct sk_buff skb)
297	{
298	neigh->used = jiffies;
299	if (!(neigh->nud_state&(NUD_CONNECTED\|NUD_DELAY\|NUD_PROBE)))
300	return __neigh_event_send(neigh, skb);
301	return 0;
302	}
303
3644f0ce SH	304	static inline int neigh_hh_output(struct hh_cache hh, struct sk_buff skb)
	305	{
	306	unsigned seq;
	307	int hh_len;
	308
	309	do {
	310	int hh_alen;
	311
	312	seq = read_seqbegin(&hh->hh_lock);
	313	hh_len = hh->hh_len;
	314	hh_alen = HH_DATA_ALIGN(hh_len);
	315	memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
	316	} while (read_seqretry(&hh->hh_lock, seq));
	317
	318	skb_push(skb, hh_len);
	319	return hh->hh_output(skb);
	320	}
	321
1da177e4 LT	322	static inline struct neighbour *
	323	__neigh_lookup(struct neigh_table tbl, const void pkey, struct net_device *dev, int creat)
	324	{
	325	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	326
	327	if (n \|\| !creat)
	328	return n;
	329
	330	n = neigh_create(tbl, pkey, dev);
	331	return IS_ERR(n) ? NULL : n;
	332	}
	333
	334	static inline struct neighbour *
	335	__neigh_lookup_errno(struct neigh_table tbl, const void pkey,
	336	struct net_device *dev)
	337	{
	338	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	339
	340	if (n)
	341	return n;
	342
	343	return neigh_create(tbl, pkey, dev);
	344	}
	345
a61bbcf2 PM	346	struct neighbour_cb {
	347	unsigned long sched_next;
	348	unsigned int flags;
	349	};
	350
	351	#define LOCALLY_ENQUEUED 0x1
	352
	353	#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
1da177e4 LT	354
1da177e4 LT	355	#endif