[mirror_ubuntu-bionic-kernel.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 <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_bytes;
	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;
	unsigned int		arp_queue_len_bytes;
	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
 */

#define NEIGH_NUM_HASH_RND	4

struct neigh_hash_table {
	struct neighbour __rcu	**hash_buckets;
	unsigned int		hash_shift;
	__u32			hash_rnd[NEIGH_NUM_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 neigh_statistics	__percpu *stats;
	struct neigh_hash_table __rcu *nht;
	struct pneigh_entry	**phash_buckets;
};

#define NEIGH_PRIV_ALIGN	sizeof(long long)
#define NEIGH_ENTRY_SIZE(size)	ALIGN((size), NEIGH_PRIV_ALIGN)

static inline void *neighbour_priv(const struct neighbour *n)
{
	return (char *)n + n->tbl->entry_size;
}

/* 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 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,
					       bool want_ref);
static inline struct neighbour *neigh_create(struct neigh_table *tbl,
					     const void *pkey,
					     struct net_device *dev)
{
	return __neigh_create(tbl, pkey, dev, true);
}
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 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 int 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(const struct hh_cache *hh, struct sk_buff *skb)
{
	unsigned int seq;
	int hh_len;

	do {
		seq = read_seqbegin(&hh->hh_lock);
		hh_len = hh->hh_len;
		if (likely(hh_len <= HH_DATA_MOD)) {
			/* this is inlined by gcc */
			memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
		} else {
			int 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 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 <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
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	45	struct neigh_parms *next;
447f2191	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
8b5c171b	62	int queue_len_bytes;
1da177e4 LT	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	101	struct sk_buff_head arp_queue;
8b5c171b	102	unsigned int arp_queue_len_bytes;
e37ef961 ED	103	struct timer_list timer;
e37ef961 ED	104	unsigned long used;
1da177e4	105	atomic_t probes;
46b13fc5 ED	106	__u8 flags;
	107	__u8 nud_state;
	108	__u8 type;
	109	__u8 dead;
0ed8ddf4	110	seqlock_t ha_lock;
d924424a	111	unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
f6b72b62	112	struct hh_cache hh;
8f40b161	113	int (output)(struct neighbour , struct sk_buff *);
89d69d2b	114	const struct neigh_ops *ops;
767e97e1	115	struct rcu_head rcu;
e37ef961	116	struct net_device *dev;
1da177e4 LT	117	u8 primary_key[0];
	118	};
	119
fd2c3ef7	120	struct neigh_ops {
1da177e4	121	int family;
8f40b161 DM	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 *);
1da177e4 LT	126	};
1da177e4 LT	127
fd2c3ef7	128	struct pneigh_entry {
1da177e4	129	struct pneigh_entry *next;
57da52c1	130	#ifdef CONFIG_NET_NS
426b5303	131	struct net *net;
57da52c1	132	#endif
426b5303	133	struct net_device *dev;
62dd9318	134	u8 flags;
1da177e4 LT	135	u8 key[0];
	136	};
	137
	138	/*
	139	* neighbour table manipulation
	140	*/
	141
2c2aba6c DM	142	#define NEIGH_NUM_HASH_RND 4
2c2aba6c DM	143
d6bf7817	144	struct neigh_hash_table {
767e97e1	145	struct neighbour __rcu **hash_buckets;
cd089336	146	unsigned int hash_shift;
2c2aba6c	147	__u32 hash_rnd[NEIGH_NUM_HASH_RND];
d6bf7817 ED	148	struct rcu_head rcu;
	149	};
	150
1da177e4	151
fd2c3ef7	152	struct neigh_table {
1da177e4 LT	153	struct neigh_table *next;
	154	int family;
	155	int entry_size;
	156	int key_len;
d6bf7817 ED	157	__u32 (hash)(const void pkey,
d6bf7817 ED	158	const struct net_device *dev,
2c2aba6c	159	__u32 *hash_rnd);
1da177e4 LT	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;
787a3445	166	/* HACK. gc_* should follow parms without a gap! */
1da177e4 LT	167	int gc_interval;
	168	int gc_thresh1;
	169	int gc_thresh2;
	170	int gc_thresh3;
	171	unsigned long last_flush;
e4c4e448	172	struct delayed_work gc_work;
1da177e4 LT	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;
7d720c3e	178	struct neigh_statistics __percpu *stats;
d6bf7817	179	struct neigh_hash_table __rcu *nht;
1da177e4	180	struct pneigh_entry **phash_buckets;
1da177e4 LT	181	};
1da177e4 LT	182
1026fec8	183	#define NEIGH_PRIV_ALIGN sizeof(long long)
daaba4fa	184	#define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN)
1026fec8 DM	185
	186	static inline void neighbour_priv(const struct neighbour n)
	187	{
08433eff	188	return (char *)n + n->tbl->entry_size;
1026fec8 DM	189	}
1026fec8 DM	190
1da177e4 LT	191	/* flags for neigh_update() */
	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
	198	extern void neigh_table_init(struct neigh_table *tbl);
	199	extern int neigh_table_clear(struct neigh_table *tbl);
	200	extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
	201	const void *pkey,
	202	struct net_device *dev);
	203	extern struct neighbour * neigh_lookup_nodev(struct neigh_table *tbl,
426b5303	204	struct net *net,
1da177e4	205	const void *pkey);
a263b309 DM	206	extern struct neighbour * __neigh_create(struct neigh_table *tbl,
	207	const void *pkey,
	208	struct net_device *dev,
	209	bool want_ref);
	210	static inline struct neighbour neigh_create(struct neigh_table tbl,
1da177e4	211	const void *pkey,
a263b309 DM	212	struct net_device *dev)
	213	{
	214	return __neigh_create(tbl, pkey, dev, true);
	215	}
1da177e4 LT	216	extern void neigh_destroy(struct neighbour *neigh);
	217	extern int __neigh_event_send(struct neighbour neigh, struct sk_buff skb);
	218	extern int neigh_update(struct neighbour neigh, const u8 lladdr, u8 new,
	219	u32 flags);
	220	extern void neigh_changeaddr(struct neigh_table tbl, struct net_device dev);
	221	extern int neigh_ifdown(struct neigh_table tbl, struct net_device dev);
8f40b161 DM	222	extern int neigh_resolve_output(struct neighbour neigh, struct sk_buff skb);
	223	extern int neigh_connected_output(struct neighbour neigh, struct sk_buff skb);
	224	extern int neigh_compat_output(struct neighbour neigh, struct sk_buff skb);
	225	extern int neigh_direct_output(struct neighbour neigh, struct sk_buff skb);
1da177e4 LT	226	extern struct neighbour neigh_event_ns(struct neigh_table tbl,
	227	u8 lladdr, void saddr,
	228	struct net_device *dev);
	229
	230	extern struct neigh_parms neigh_parms_alloc(struct net_device dev, struct neigh_table *tbl);
	231	extern void neigh_parms_release(struct neigh_table tbl, struct neigh_parms parms);
57da52c1 YH	232
	233	static inline
	234	struct net neigh_parms_net(const struct neigh_parms parms)
	235	{
e42ea986	236	return read_pnet(&parms->net);
57da52c1 YH	237	}
57da52c1 YH	238
1da177e4 LT	239	extern unsigned long neigh_rand_reach_time(unsigned long base);
	240
	241	extern void pneigh_enqueue(struct neigh_table tbl, struct neigh_parms p,
	242	struct sk_buff *skb);
426b5303	243	extern struct pneigh_entry pneigh_lookup(struct neigh_table tbl, struct net net, const void key, struct net_device *dev, int creat);
fa86d322 PE	244	extern struct pneigh_entry __pneigh_lookup(struct neigh_table tbl,
	245	struct net *net,
	246	const void *key,
	247	struct net_device *dev);
426b5303	248	extern int pneigh_delete(struct neigh_table tbl, struct net net, const void key, struct net_device dev);
1da177e4	249
57da52c1 YH	250	static inline
	251	struct net pneigh_net(const struct pneigh_entry pneigh)
	252	{
e42ea986	253	return read_pnet(&pneigh->net);
57da52c1 YH	254	}
57da52c1 YH	255
1da177e4	256	extern void neigh_app_ns(struct neighbour *n);
1da177e4 LT	257	extern void neigh_for_each(struct neigh_table tbl, void (cb)(struct neighbour , void ), void *cookie);
	258	extern void __neigh_for_each_release(struct neigh_table tbl, int (cb)(struct neighbour *));
	259	extern void pneigh_for_each(struct neigh_table tbl, void (cb)(struct pneigh_entry *));
	260
	261	struct neigh_seq_state {
42508461	262	struct seq_net_private p;
1da177e4	263	struct neigh_table *tbl;
d6bf7817	264	struct neigh_hash_table *nht;
1da177e4 LT	265	void (neigh_sub_iter)(struct neigh_seq_state *state,
	266	struct neighbour n, loff_t pos);
	267	unsigned int bucket;
	268	unsigned int flags;
	269	#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
	270	#define NEIGH_SEQ_IS_PNEIGH 0x00000002
	271	#define NEIGH_SEQ_SKIP_NOARP 0x00000004
	272	};
	273	extern void neigh_seq_start(struct seq_file , loff_t , struct neigh_table , unsigned int);
	274	extern void neigh_seq_next(struct seq_file , void , loff_t );
	275	extern void neigh_seq_stop(struct seq_file , void );
	276
	277	extern int neigh_sysctl_register(struct net_device *dev,
	278	struct neigh_parms *p,
1da177e4	279	char *p_name,
f8572d8f	280	proc_handler *proc_handler);
1da177e4 LT	281	extern void neigh_sysctl_unregister(struct neigh_parms *p);
	282
	283	static inline void __neigh_parms_put(struct neigh_parms *parms)
	284	{
	285	atomic_dec(&parms->refcnt);
	286	}
	287
1da177e4 LT	288	static inline struct neigh_parms neigh_parms_clone(struct neigh_parms parms)
	289	{
	290	atomic_inc(&parms->refcnt);
	291	return parms;
	292	}
	293
	294	/*
	295	* Neighbour references
	296	*/
	297
	298	static inline void neigh_release(struct neighbour *neigh)
	299	{
	300	if (atomic_dec_and_test(&neigh->refcnt))
	301	neigh_destroy(neigh);
	302	}
	303
	304	static inline struct neighbour * neigh_clone(struct neighbour *neigh)
	305	{
	306	if (neigh)
	307	atomic_inc(&neigh->refcnt);
	308	return neigh;
	309	}
	310
	311	#define neigh_hold(n) atomic_inc(&(n)->refcnt)
	312
1da177e4 LT	313	static inline int neigh_event_send(struct neighbour neigh, struct sk_buff skb)
1da177e4 LT	314	{
ef22b7b6	315	unsigned long now = jiffies;
0ed8ddf4 ED	316
	317	if (neigh->used != now)
	318	neigh->used = now;
1da177e4 LT	319	if (!(neigh->nud_state&(NUD_CONNECTED\|NUD_DELAY\|NUD_PROBE)))
	320	return __neigh_event_send(neigh, skb);
	321	return 0;
	322	}
	323
e179e632 BDS	324	#ifdef CONFIG_BRIDGE_NETFILTER
	325	static inline int neigh_hh_bridge(struct hh_cache hh, struct sk_buff skb)
	326	{
95c96174	327	unsigned int seq, hh_alen;
e179e632 BDS	328
	329	do {
	330	seq = read_seqbegin(&hh->hh_lock);
	331	hh_alen = HH_DATA_ALIGN(ETH_HLEN);
	332	memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
	333	} while (read_seqretry(&hh->hh_lock, seq));
	334	return 0;
	335	}
	336	#endif
	337
425f09ab	338	static inline int neigh_hh_output(const struct hh_cache hh, struct sk_buff skb)
3644f0ce	339	{
95c96174	340	unsigned int seq;
3644f0ce SH	341	int hh_len;
	342
	343	do {
3644f0ce SH	344	seq = read_seqbegin(&hh->hh_lock);
3644f0ce SH	345	hh_len = hh->hh_len;
425f09ab ED	346	if (likely(hh_len <= HH_DATA_MOD)) {
	347	/* this is inlined by gcc */
	348	memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
	349	} else {
	350	int hh_alen = HH_DATA_ALIGN(hh_len);
	351
	352	memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
	353	}
3644f0ce SH	354	} while (read_seqretry(&hh->hh_lock, seq));
	355
	356	skb_push(skb, hh_len);
b23b5455	357	return dev_queue_xmit(skb);
3644f0ce SH	358	}
3644f0ce SH	359
1da177e4 LT	360	static inline struct neighbour *
	361	__neigh_lookup(struct neigh_table tbl, const void pkey, struct net_device *dev, int creat)
	362	{
	363	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	364
	365	if (n \|\| !creat)
	366	return n;
	367
	368	n = neigh_create(tbl, pkey, dev);
	369	return IS_ERR(n) ? NULL : n;
	370	}
	371
	372	static inline struct neighbour *
	373	__neigh_lookup_errno(struct neigh_table tbl, const void pkey,
	374	struct net_device *dev)
	375	{
	376	struct neighbour *n = neigh_lookup(tbl, pkey, dev);
	377
	378	if (n)
	379	return n;
	380
	381	return neigh_create(tbl, pkey, dev);
	382	}
	383
a61bbcf2 PM	384	struct neighbour_cb {
	385	unsigned long sched_next;
	386	unsigned int flags;
	387	};
	388
	389	#define LOCALLY_ENQUEUED 0x1
	390
	391	#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
1da177e4	392
0ed8ddf4 ED	393	static inline void neigh_ha_snapshot(char dst, const struct neighbour n,
	394	const struct net_device *dev)
	395	{
	396	unsigned int seq;
	397
	398	do {
	399	seq = read_seqbegin(&n->ha_lock);
	400	memcpy(dst, n->ha, dev->addr_len);
	401	} while (read_seqretry(&n->ha_lock, seq));
	402	}
1da177e4	403	#endif