[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 <linux/workqueue.h>
#include <net/rtnetlink.h>

/*
 * NUD stands for "neighbor unreachability detection"
 */

#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 {
#ifdef CONFIG_NET_NS
	struct net *net;
#endif
	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;	/* number 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 */

	unsigned long unres_discards;	/* number of unresolved drops */
};

#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;
	const 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;
#ifdef CONFIG_NET_NS
	struct net		*net;
#endif
	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 delayed_work	gc_work;
	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;
	struct pneigh_entry	**phash_buckets;
};

/* 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,
						   struct net *net,
						   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);

static inline
struct net			*neigh_parms_net(const struct neigh_parms *parms)
{
	return read_pnet(&parms->net);
}

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, struct net *net, const void *key, struct net_device *dev, int creat);
extern struct pneigh_entry	*__pneigh_lookup(struct neigh_table *tbl,
						 struct net *net,
						 const void *key,
						 struct net_device *dev);
extern int			pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key, struct net_device *dev);

static inline
struct net			*pneigh_net(const struct pneigh_entry *pneigh)
{
	return read_pnet(&pneigh->net);
}

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 seq_net_private p;
	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 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_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>
e4c4e448	27	#include <linux/workqueue.h>
c8822a4e	28	#include <net/rtnetlink.h>
1da177e4	29
39971554 PE	30	/*
	31	* NUD stands for "neighbor unreachability detection"
	32	*/
	33
1da177e4 LT	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
fd2c3ef7	40	struct neigh_parms {
57da52c1	41	#ifdef CONFIG_NET_NS
426b5303	42	struct net *net;
57da52c1	43	#endif
c7fb64db	44	struct net_device *dev;
1da177e4 LT	45	struct neigh_parms *next;
1da177e4 LT	46	int (neigh_setup)(struct neighbour );
ecbb4169	47	void (neigh_cleanup)(struct neighbour );
1da177e4	48	struct neigh_table *tbl;
1da177e4 LT	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
fd2c3ef7	72	struct neigh_statistics {
1da177e4 LT	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
9a6d276e	77	unsigned long res_failed; /* number of failed resolutions */
1da177e4 LT	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 */
9a6d276e NH	87
9a6d276e NH	88	unsigned long unres_discards; /* number of unresolved drops */
1da177e4 LT	89	};
	90
	91	#define NEIGH_CACHE_STAT_INC(tbl, field) \
	92	do { \
	93	preempt_disable(); \
	94	(per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \
	95	preempt_enable(); \
	96	} while (0)
	97
fd2c3ef7	98	struct neighbour {
1da177e4 LT	99	struct neighbour *next;
	100	struct neigh_table *tbl;
	101	struct neigh_parms *parms;
	102	struct net_device *dev;
	103	unsigned long used;
	104	unsigned long confirmed;
	105	unsigned long updated;
	106	__u8 flags;
	107	__u8 nud_state;
	108	__u8 type;
	109	__u8 dead;
	110	atomic_t probes;
	111	rwlock_t lock;
d924424a	112	unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
1da177e4 LT	113	struct hh_cache *hh;
	114	atomic_t refcnt;
	115	int (output)(struct sk_buff skb);
	116	struct sk_buff_head arp_queue;
	117	struct timer_list timer;
89d69d2b	118	const struct neigh_ops *ops;
1da177e4 LT	119	u8 primary_key[0];
	120	};
	121
fd2c3ef7	122	struct neigh_ops {
1da177e4	123	int family;
1da177e4 LT	124	void (solicit)(struct neighbour , struct sk_buff*);
	125	void (error_report)(struct neighbour , struct sk_buff*);
	126	int (output)(struct sk_buff);
	127	int (connected_output)(struct sk_buff);
	128	int (hh_output)(struct sk_buff);
	129	int (queue_xmit)(struct sk_buff);
	130	};
	131
fd2c3ef7	132	struct pneigh_entry {
1da177e4	133	struct pneigh_entry *next;
57da52c1	134	#ifdef CONFIG_NET_NS
426b5303	135	struct net *net;
57da52c1	136	#endif
426b5303	137	struct net_device *dev;
62dd9318	138	u8 flags;
1da177e4 LT	139	u8 key[0];
	140	};
	141
	142	/*
	143	* neighbour table manipulation
	144	*/
	145
	146
fd2c3ef7	147	struct neigh_table {
1da177e4 LT	148	struct neigh_table *next;
	149	int family;
	150	int entry_size;
	151	int key_len;
	152	__u32 (hash)(const void pkey, const struct net_device *);
	153	int (constructor)(struct neighbour );
	154	int (pconstructor)(struct pneigh_entry );
	155	void (pdestructor)(struct pneigh_entry );
	156	void (proxy_redo)(struct sk_buff skb);
	157	char *id;
	158	struct neigh_parms parms;
	159	/* HACK. gc_* shoul follow parms without a gap! */
	160	int gc_interval;
	161	int gc_thresh1;
	162	int gc_thresh2;
	163	int gc_thresh3;
	164	unsigned long last_flush;
e4c4e448	165	struct delayed_work gc_work;
1da177e4 LT	166	struct timer_list proxy_timer;
	167	struct sk_buff_head proxy_queue;
	168	atomic_t entries;
	169	rwlock_t lock;
	170	unsigned long last_rand;
e18b890b	171	struct kmem_cache *kmem_cachep;
1da177e4 LT	172	struct neigh_statistics *stats;
	173	struct neighbour **hash_buckets;
	174	unsigned int hash_mask;
	175	__u32 hash_rnd;
1da177e4	176	struct pneigh_entry **phash_buckets;
1da177e4 LT	177	};
	178
	179	/* flags for neigh_update() */
	180	#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
	181	#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
	182	#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
	183	#define NEIGH_UPDATE_F_ISROUTER 0x40000000
	184	#define NEIGH_UPDATE_F_ADMIN 0x80000000
	185
	186	extern void neigh_table_init(struct neigh_table *tbl);
bd89efc5	187	extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
1da177e4 LT	188	extern int neigh_table_clear(struct neigh_table *tbl);
	189	extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
	190	const void *pkey,
	191	struct net_device *dev);
	192	extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
426b5303	193	struct net *net,
1da177e4 LT	194	const void *pkey);
	195	extern struct neighbour * neigh_create(struct neigh_table *tbl,
	196	const void *pkey,
	197	struct net_device *dev);
	198	extern void neigh_destroy(struct neighbour *neigh);
	199	extern int __neigh_event_send(struct neighbour neigh, struct sk_buff skb);
	200	extern int neigh_update(struct neighbour neigh, const u8 lladdr, u8 new,
	201	u32 flags);
	202	extern void neigh_changeaddr(struct neigh_table tbl, struct net_device dev);
	203	extern int neigh_ifdown(struct neigh_table tbl, struct net_device dev);
	204	extern int neigh_resolve_output(struct sk_buff *skb);
	205	extern int neigh_connected_output(struct sk_buff *skb);
	206	extern int neigh_compat_output(struct sk_buff *skb);
	207	extern struct neighbour neigh_event_ns(struct neigh_table tbl,
	208	u8 lladdr, void saddr,
	209	struct net_device *dev);
	210
	211	extern struct neigh_parms neigh_parms_alloc(struct net_device dev, struct neigh_table *tbl);
	212	extern void neigh_parms_release(struct neigh_table tbl, struct neigh_parms parms);
57da52c1 YH	213
	214	static inline
	215	struct net neigh_parms_net(const struct neigh_parms parms)
	216	{
e42ea986	217	return read_pnet(&parms->net);
57da52c1 YH	218	}
57da52c1 YH	219
1da177e4 LT	220	extern unsigned long neigh_rand_reach_time(unsigned long base);
	221
	222	extern void pneigh_enqueue(struct neigh_table tbl, struct neigh_parms p,
	223	struct sk_buff *skb);
426b5303	224	extern struct pneigh_entry pneigh_lookup(struct neigh_table tbl, struct net net, const void key, struct net_device *dev, int creat);
fa86d322 PE	225	extern struct pneigh_entry __pneigh_lookup(struct neigh_table tbl,
	226	struct net *net,
	227	const void *key,
	228	struct net_device *dev);
426b5303	229	extern int pneigh_delete(struct neigh_table tbl, struct net net, const void key, struct net_device dev);
1da177e4	230
57da52c1 YH	231	static inline
	232	struct net pneigh_net(const struct pneigh_entry pneigh)
	233	{
e42ea986	234	return read_pnet(&pneigh->net);
57da52c1 YH	235	}
57da52c1 YH	236
1da177e4	237	extern void neigh_app_ns(struct neighbour *n);
1da177e4 LT	238	extern void neigh_for_each(struct neigh_table tbl, void (cb)(struct neighbour , void ), void *cookie);
	239	extern void __neigh_for_each_release(struct neigh_table tbl, int (cb)(struct neighbour *));
	240	extern void pneigh_for_each(struct neigh_table tbl, void (cb)(struct pneigh_entry *));
	241
	242	struct neigh_seq_state {
42508461	243	struct seq_net_private p;
1da177e4 LT	244	struct neigh_table *tbl;
	245	void (neigh_sub_iter)(struct neigh_seq_state *state,
	246	struct neighbour n, loff_t pos);
	247	unsigned int bucket;
	248	unsigned int flags;
	249	#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
	250	#define NEIGH_SEQ_IS_PNEIGH 0x00000002
	251	#define NEIGH_SEQ_SKIP_NOARP 0x00000004
	252	};
	253	extern void neigh_seq_start(struct seq_file , loff_t , struct neigh_table , unsigned int);
	254	extern void neigh_seq_next(struct seq_file , void , loff_t );
	255	extern void neigh_seq_stop(struct seq_file , void );
	256
	257	extern int neigh_sysctl_register(struct net_device *dev,
	258	struct neigh_parms *p,
	259	int p_id, int pdev_id,
	260	char *p_name,
	261	proc_handler *proc_handler,
	262	ctl_handler *strategy);
	263	extern void neigh_sysctl_unregister(struct neigh_parms *p);
	264
	265	static inline void __neigh_parms_put(struct neigh_parms *parms)
	266	{
	267	atomic_dec(&parms->refcnt);
	268	}
	269
1da177e4 LT	270	static inline struct neigh_parms neigh_parms_clone(struct neigh_parms parms)
	271	{
	272	atomic_inc(&parms->refcnt);
	273	return parms;
	274	}
	275
	276	/*
	277	* Neighbour references
	278	*/
	279
	280	static inline void neigh_release(struct neighbour *neigh)
	281	{
	282	if (atomic_dec_and_test(&neigh->refcnt))
	283	neigh_destroy(neigh);
	284	}
	285
	286	static inline struct neighbour * neigh_clone(struct neighbour *neigh)
	287	{
	288	if (neigh)
	289	atomic_inc(&neigh->refcnt);
	290	return neigh;
	291	}
	292
	293	#define neigh_hold(n) atomic_inc(&(n)->refcnt)
	294
	295	static inline void neigh_confirm(struct neighbour *neigh)
	296	{
	297	if (neigh)
	298	neigh->confirmed = jiffies;
	299	}
	300
1da177e4 LT	301	static inline int neigh_event_send(struct neighbour neigh, struct sk_buff skb)
	302	{
	303	neigh->used = jiffies;
	304	if (!(neigh->nud_state&(NUD_CONNECTED\|NUD_DELAY\|NUD_PROBE)))
	305	return __neigh_event_send(neigh, skb);
	306	return 0;
	307	}
	308
3644f0ce SH	309	static inline int neigh_hh_output(struct hh_cache hh, struct sk_buff skb)
	310	{
	311	unsigned seq;
	312	int hh_len;
	313
	314	do {
	315	int hh_alen;
	316
	317	seq = read_seqbegin(&hh->hh_lock);
	318	hh_len = hh->hh_len;
	319	hh_alen = HH_DATA_ALIGN(hh_len);
	320	memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
	321	} while (read_seqretry(&hh->hh_lock, seq));
	322
	323	skb_push(skb, hh_len);
	324	return hh->hh_output(skb);
	325	}
	326
1da177e4 LT	327	static inline struct neighbour *
	328	__neigh_lookup(struct neigh_table tbl, const void pkey, struct net_device *dev, int creat)
	329	{
	330	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	331
	332	if (n \|\| !creat)
	333	return n;
	334
	335	n = neigh_create(tbl, pkey, dev);
	336	return IS_ERR(n) ? NULL : n;
	337	}
	338
	339	static inline struct neighbour *
	340	__neigh_lookup_errno(struct neigh_table tbl, const void pkey,
	341	struct net_device *dev)
	342	{
	343	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	344
	345	if (n)
	346	return n;
	347
	348	return neigh_create(tbl, pkey, dev);
	349	}
	350
a61bbcf2 PM	351	struct neighbour_cb {
	352	unsigned long sched_next;
	353	unsigned int flags;
	354	};
	355
	356	#define LOCALLY_ENQUEUED 0x1
	357
	358	#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
1da177e4 LT	359
1da177e4 LT	360	#endif