[linux.git] / include / net / neighbour.h

#ifndef _NET_NEIGHBOUR_H
#define _NET_NEIGHBOUR_H

#include <linux/neighbour.h>

/*
 *	Generic neighbour manipulation
 *
 *	Authors:
 *	Pedro Roque		<[email protected]>
 *	Alexey Kuznetsov	<[email protected]>
 *
 * 	Changes:
 *
 *	Harald Welte:		<[email protected]>
 *		- Add neighbour cache statistics like rtstat
 */

#include <linux/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) this_cpu_inc((tbl)->stats->field)

struct neighbour {
	struct neighbour __rcu	*next;
	struct neigh_table	*tbl;
	struct neigh_parms	*parms;
	unsigned long		confirmed;
	unsigned long		updated;
	rwlock_t		lock;
	atomic_t		refcnt;
	struct sk_buff_head	arp_queue;
	struct timer_list	timer;
	unsigned long		used;
	atomic_t		probes;
	__u8			flags;
	__u8			nud_state;
	__u8			type;
	__u8			dead;
	seqlock_t		ha_lock;
	unsigned char		ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
	struct hh_cache		hh;
	int			(*output)(struct neighbour *, struct sk_buff *);
	const struct neigh_ops	*ops;
	struct rcu_head		rcu;
	struct net_device	*dev;
	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 neighbour *, struct sk_buff *);
	int			(*connected_output)(struct neighbour *, 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_hash_table {
	struct neighbour __rcu	**hash_buckets;
	unsigned int		hash_shift;
	__u32			hash_rnd;
	struct rcu_head		rcu;
};


struct neigh_table {
	struct neigh_table	*next;
	int			family;
	int			entry_size;
	int			key_len;
	__u32			(*hash)(const void *pkey,
					const struct net_device *dev,
					__u32 hash_rnd);
	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_* should 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	__percpu *stats;
	struct neigh_hash_table __rcu *nht;
	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 neighbour *neigh, struct sk_buff *skb);
extern int			neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb);
extern int			neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb);
extern int			neigh_direct_output(struct neighbour *neigh, 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;
	struct neigh_hash_table *nht;
	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,
						      char *p_name,
						      proc_handler *proc_handler);
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)
{
	unsigned long now = jiffies;
	
	if (neigh->used != now)
		neigh->used = now;
	if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
		return __neigh_event_send(neigh, skb);
	return 0;
}

#ifdef CONFIG_BRIDGE_NETFILTER
static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
{
	unsigned seq, hh_alen;

	do {
		seq = read_seqbegin(&hh->hh_lock);
		hh_alen = HH_DATA_ALIGN(ETH_HLEN);
		memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
	} while (read_seqretry(&hh->hh_lock, seq));
	return 0;
}
#endif

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 dev_queue_xmit(skb);
}

static inline int neigh_output(struct neighbour *n, struct sk_buff *skb)
{
	struct hh_cache *hh = &n->hh;
	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
		return neigh_hh_output(hh, skb);
	else
		return n->output(n, 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)

static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
				     const struct net_device *dev)
{
	unsigned int seq;

	do {
		seq = read_seqbegin(&n->ha_lock);
		memcpy(dst, n->ha, dev->addr_len);
	} while (read_seqretry(&n->ha_lock, seq));
}
#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 <[email protected]>
	11	* Alexey Kuznetsov <[email protected]>
	12	*
	13	* Changes:
	14	*
	15	* Harald Welte: <[email protected]>
	16	* - Add neighbour cache statistics like rtstat
	17	*/
	18
60063497	19	#include <linux/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	};
1da177e4 LT	90
4ea7334b	91	#define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
1da177e4	92
fd2c3ef7	93	struct neighbour {
767e97e1	94	struct neighbour __rcu *next;
1da177e4 LT	95	struct neigh_table *tbl;
1da177e4 LT	96	struct neigh_parms *parms;
1da177e4 LT	97	unsigned long confirmed;
1da177e4 LT	98	unsigned long updated;
46b13fc5	99	rwlock_t lock;
367e5e37	100	atomic_t refcnt;
e37ef961 ED	101	struct sk_buff_head arp_queue;
	102	struct timer_list timer;
	103	unsigned long used;
1da177e4	104	atomic_t probes;
46b13fc5 ED	105	__u8 flags;
	106	__u8 nud_state;
	107	__u8 type;
	108	__u8 dead;
0ed8ddf4	109	seqlock_t ha_lock;
d924424a	110	unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
f6b72b62	111	struct hh_cache hh;
8f40b161	112	int (output)(struct neighbour , struct sk_buff *);
89d69d2b	113	const struct neigh_ops *ops;
767e97e1	114	struct rcu_head rcu;
e37ef961	115	struct net_device *dev;
1da177e4 LT	116	u8 primary_key[0];
	117	};
	118
fd2c3ef7	119	struct neigh_ops {
1da177e4	120	int family;
8f40b161 DM	121	void (solicit)(struct neighbour , struct sk_buff *);
	122	void (error_report)(struct neighbour , struct sk_buff *);
	123	int (output)(struct neighbour , struct sk_buff *);
	124	int (connected_output)(struct neighbour , struct sk_buff *);
1da177e4 LT	125	};
1da177e4 LT	126
fd2c3ef7	127	struct pneigh_entry {
1da177e4	128	struct pneigh_entry *next;
57da52c1	129	#ifdef CONFIG_NET_NS
426b5303	130	struct net *net;
57da52c1	131	#endif
426b5303	132	struct net_device *dev;
62dd9318	133	u8 flags;
1da177e4 LT	134	u8 key[0];
	135	};
	136
	137	/*
	138	* neighbour table manipulation
	139	*/
	140
d6bf7817	141	struct neigh_hash_table {
767e97e1	142	struct neighbour __rcu **hash_buckets;
cd089336	143	unsigned int hash_shift;
d6bf7817 ED	144	__u32 hash_rnd;
	145	struct rcu_head rcu;
	146	};
	147
1da177e4	148
fd2c3ef7	149	struct neigh_table {
1da177e4 LT	150	struct neigh_table *next;
	151	int family;
	152	int entry_size;
	153	int key_len;
d6bf7817 ED	154	__u32 (hash)(const void pkey,
	155	const struct net_device *dev,
	156	__u32 hash_rnd);
1da177e4 LT	157	int (constructor)(struct neighbour );
	158	int (pconstructor)(struct pneigh_entry );
	159	void (pdestructor)(struct pneigh_entry );
	160	void (proxy_redo)(struct sk_buff skb);
	161	char *id;
	162	struct neigh_parms parms;
787a3445	163	/* HACK. gc_* should follow parms without a gap! */
1da177e4 LT	164	int gc_interval;
	165	int gc_thresh1;
	166	int gc_thresh2;
	167	int gc_thresh3;
	168	unsigned long last_flush;
e4c4e448	169	struct delayed_work gc_work;
1da177e4 LT	170	struct timer_list proxy_timer;
	171	struct sk_buff_head proxy_queue;
	172	atomic_t entries;
	173	rwlock_t lock;
	174	unsigned long last_rand;
367e5e37	175	struct kmem_cache *kmem_cachep;
7d720c3e	176	struct neigh_statistics __percpu *stats;
d6bf7817	177	struct neigh_hash_table __rcu *nht;
1da177e4	178	struct pneigh_entry **phash_buckets;
1da177e4 LT	179	};
	180
	181	/* flags for neigh_update() */
	182	#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
	183	#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
	184	#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
	185	#define NEIGH_UPDATE_F_ISROUTER 0x40000000
	186	#define NEIGH_UPDATE_F_ADMIN 0x80000000
	187
	188	extern void neigh_table_init(struct neigh_table *tbl);
bd89efc5	189	extern void neigh_table_init_no_netlink(struct neigh_table *tbl);
1da177e4 LT	190	extern int neigh_table_clear(struct neigh_table *tbl);
	191	extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
	192	const void *pkey,
	193	struct net_device *dev);
	194	extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
426b5303	195	struct net *net,
1da177e4 LT	196	const void *pkey);
	197	extern struct neighbour * neigh_create(struct neigh_table *tbl,
	198	const void *pkey,
	199	struct net_device *dev);
	200	extern void neigh_destroy(struct neighbour *neigh);
	201	extern int __neigh_event_send(struct neighbour neigh, struct sk_buff skb);
	202	extern int neigh_update(struct neighbour neigh, const u8 lladdr, u8 new,
	203	u32 flags);
	204	extern void neigh_changeaddr(struct neigh_table tbl, struct net_device dev);
	205	extern int neigh_ifdown(struct neigh_table tbl, struct net_device dev);
8f40b161 DM	206	extern int neigh_resolve_output(struct neighbour neigh, struct sk_buff skb);
	207	extern int neigh_connected_output(struct neighbour neigh, struct sk_buff skb);
	208	extern int neigh_compat_output(struct neighbour neigh, struct sk_buff skb);
	209	extern int neigh_direct_output(struct neighbour neigh, struct sk_buff skb);
1da177e4 LT	210	extern struct neighbour neigh_event_ns(struct neigh_table tbl,
	211	u8 lladdr, void saddr,
	212	struct net_device *dev);
	213
	214	extern struct neigh_parms neigh_parms_alloc(struct net_device dev, struct neigh_table *tbl);
	215	extern void neigh_parms_release(struct neigh_table tbl, struct neigh_parms parms);
57da52c1 YH	216
	217	static inline
	218	struct net neigh_parms_net(const struct neigh_parms parms)
	219	{
e42ea986	220	return read_pnet(&parms->net);
57da52c1 YH	221	}
57da52c1 YH	222
1da177e4 LT	223	extern unsigned long neigh_rand_reach_time(unsigned long base);
	224
	225	extern void pneigh_enqueue(struct neigh_table tbl, struct neigh_parms p,
	226	struct sk_buff *skb);
426b5303	227	extern struct pneigh_entry pneigh_lookup(struct neigh_table tbl, struct net net, const void key, struct net_device *dev, int creat);
fa86d322 PE	228	extern struct pneigh_entry __pneigh_lookup(struct neigh_table tbl,
	229	struct net *net,
	230	const void *key,
	231	struct net_device *dev);
426b5303	232	extern int pneigh_delete(struct neigh_table tbl, struct net net, const void key, struct net_device dev);
1da177e4	233
57da52c1 YH	234	static inline
	235	struct net pneigh_net(const struct pneigh_entry pneigh)
	236	{
e42ea986	237	return read_pnet(&pneigh->net);
57da52c1 YH	238	}
57da52c1 YH	239
1da177e4	240	extern void neigh_app_ns(struct neighbour *n);
1da177e4 LT	241	extern void neigh_for_each(struct neigh_table tbl, void (cb)(struct neighbour , void ), void *cookie);
	242	extern void __neigh_for_each_release(struct neigh_table tbl, int (cb)(struct neighbour *));
	243	extern void pneigh_for_each(struct neigh_table tbl, void (cb)(struct pneigh_entry *));
	244
	245	struct neigh_seq_state {
42508461	246	struct seq_net_private p;
1da177e4	247	struct neigh_table *tbl;
d6bf7817	248	struct neigh_hash_table *nht;
1da177e4 LT	249	void (neigh_sub_iter)(struct neigh_seq_state *state,
	250	struct neighbour n, loff_t pos);
	251	unsigned int bucket;
	252	unsigned int flags;
	253	#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
	254	#define NEIGH_SEQ_IS_PNEIGH 0x00000002
	255	#define NEIGH_SEQ_SKIP_NOARP 0x00000004
	256	};
	257	extern void neigh_seq_start(struct seq_file , loff_t , struct neigh_table , unsigned int);
	258	extern void neigh_seq_next(struct seq_file , void , loff_t );
	259	extern void neigh_seq_stop(struct seq_file , void );
	260
	261	extern int neigh_sysctl_register(struct net_device *dev,
	262	struct neigh_parms *p,
1da177e4	263	char *p_name,
f8572d8f	264	proc_handler *proc_handler);
1da177e4 LT	265	extern void neigh_sysctl_unregister(struct neigh_parms *p);
	266
	267	static inline void __neigh_parms_put(struct neigh_parms *parms)
	268	{
	269	atomic_dec(&parms->refcnt);
	270	}
	271
1da177e4 LT	272	static inline struct neigh_parms neigh_parms_clone(struct neigh_parms parms)
	273	{
	274	atomic_inc(&parms->refcnt);
	275	return parms;
	276	}
	277
	278	/*
	279	* Neighbour references
	280	*/
	281
	282	static inline void neigh_release(struct neighbour *neigh)
	283	{
	284	if (atomic_dec_and_test(&neigh->refcnt))
	285	neigh_destroy(neigh);
	286	}
	287
	288	static inline struct neighbour * neigh_clone(struct neighbour *neigh)
	289	{
	290	if (neigh)
	291	atomic_inc(&neigh->refcnt);
	292	return neigh;
	293	}
	294
	295	#define neigh_hold(n) atomic_inc(&(n)->refcnt)
	296
	297	static inline void neigh_confirm(struct neighbour *neigh)
	298	{
	299	if (neigh)
	300	neigh->confirmed = jiffies;
	301	}
	302
1da177e4 LT	303	static inline int neigh_event_send(struct neighbour neigh, struct sk_buff skb)
1da177e4 LT	304	{
ef22b7b6	305	unsigned long now = jiffies;
0ed8ddf4 ED	306
	307	if (neigh->used != now)
	308	neigh->used = now;
1da177e4 LT	309	if (!(neigh->nud_state&(NUD_CONNECTED\|NUD_DELAY\|NUD_PROBE)))
	310	return __neigh_event_send(neigh, skb);
	311	return 0;
	312	}
	313
e179e632 BDS	314	#ifdef CONFIG_BRIDGE_NETFILTER
	315	static inline int neigh_hh_bridge(struct hh_cache hh, struct sk_buff skb)
	316	{
	317	unsigned seq, hh_alen;
	318
	319	do {
	320	seq = read_seqbegin(&hh->hh_lock);
	321	hh_alen = HH_DATA_ALIGN(ETH_HLEN);
	322	memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
	323	} while (read_seqretry(&hh->hh_lock, seq));
	324	return 0;
	325	}
	326	#endif
	327
3644f0ce SH	328	static inline int neigh_hh_output(struct hh_cache hh, struct sk_buff skb)
	329	{
	330	unsigned seq;
	331	int hh_len;
	332
	333	do {
	334	int hh_alen;
	335
	336	seq = read_seqbegin(&hh->hh_lock);
	337	hh_len = hh->hh_len;
	338	hh_alen = HH_DATA_ALIGN(hh_len);
	339	memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
	340	} while (read_seqretry(&hh->hh_lock, seq));
	341
	342	skb_push(skb, hh_len);
b23b5455	343	return dev_queue_xmit(skb);
3644f0ce SH	344	}
3644f0ce SH	345
05e3aa09 DM	346	static inline int neigh_output(struct neighbour n, struct sk_buff skb)
	347	{
	348	struct hh_cache *hh = &n->hh;
b23b5455	349	if ((n->nud_state & NUD_CONNECTED) && hh->hh_len)
05e3aa09 DM	350	return neigh_hh_output(hh, skb);
05e3aa09 DM	351	else
8f40b161	352	return n->output(n, skb);
05e3aa09 DM	353	}
05e3aa09 DM	354
1da177e4 LT	355	static inline struct neighbour *
	356	__neigh_lookup(struct neigh_table tbl, const void pkey, struct net_device *dev, int creat)
	357	{
	358	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	359
	360	if (n \|\| !creat)
	361	return n;
	362
	363	n = neigh_create(tbl, pkey, dev);
	364	return IS_ERR(n) ? NULL : n;
	365	}
	366
	367	static inline struct neighbour *
	368	__neigh_lookup_errno(struct neigh_table tbl, const void pkey,
	369	struct net_device *dev)
	370	{
	371	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	372
	373	if (n)
	374	return n;
	375
	376	return neigh_create(tbl, pkey, dev);
	377	}
	378
a61bbcf2 PM	379	struct neighbour_cb {
	380	unsigned long sched_next;
	381	unsigned int flags;
	382	};
	383
	384	#define LOCALLY_ENQUEUED 0x1
	385
	386	#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
1da177e4	387
0ed8ddf4 ED	388	static inline void neigh_ha_snapshot(char dst, const struct neighbour n,
	389	const struct net_device *dev)
	390	{
	391	unsigned int seq;
	392
	393	do {
	394	seq = read_seqbegin(&n->ha_lock);
	395	memcpy(dst, n->ha, dev->addr_len);
	396	} while (read_seqretry(&n->ha_lock, seq));
	397	}
1da177e4	398	#endif