#ifndef _NET_NEIGHBOUR_H
#define _NET_NEIGHBOUR_H
/*
* Generic neighbour manipulation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
*/
/* The following flags & states are exported to user space,
so that they should be moved to include/linux/ directory.
*/
/*
* Neighbor Cache Entry Flags
*/
#define NTF_PROXY 0x08 /* == ATF_PUBL */
#define NTF_ROUTER 0x80
/*
* Neighbor Cache Entry States.
*/
#define NUD_INCOMPLETE 0x01
#define NUD_REACHABLE 0x02
#define NUD_STALE 0x04
#define NUD_DELAY 0x08
#define NUD_PROBE 0x10
#define NUD_FAILED 0x20
/* Dummy states */
#define NUD_NOARP 0x40
#define NUD_PERMANENT 0x80
#define NUD_NONE 0x00
/* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
and make no address resolution or NUD.
NUD_PERMANENT is also cannot be deleted by garbage collectors.
*/
#ifdef __KERNEL__
#include <asm/atomic.h>
#include <linux/skbuff.h>
#define NUD_IN_TIMER (NUD_INCOMPLETE|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 neigh_parms
{
struct neigh_parms *next;
int (*neigh_setup)(struct neighbour *);
struct neigh_table *tbl;
int entries;
void *priv;
void *sysctl_table;
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;
unsigned long res_failed;
unsigned long rcv_probes_mcast;
unsigned long rcv_probes_ucast;
};
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[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
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 (*destructor)(struct neighbour *);
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 key[0];
};
#define NEIGH_HASHMASK 0x1F
#define PNEIGH_HASHMASK 0xF
/*
* 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;
int entries;
rwlock_t lock;
unsigned long last_rand;
struct neigh_parms *parms_list;
kmem_cache_t *kmem_cachep;
struct tasklet_struct gc_task;
struct neigh_statistics stats;
struct neighbour *hash_buckets[NEIGH_HASHMASK+1];
struct pneigh_entry *phash_buckets[PNEIGH_HASHMASK+1];
};
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_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, int override, int arp);
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 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);
struct netlink_callback;
struct nlmsghdr;
extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
extern void neigh_app_ns(struct neighbour *n);
extern int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
int p_id, int pdev_id, char *p_name);
extern void neigh_sysctl_unregister(struct neigh_parms *p);
/*
* Neighbour references
*/
extern __inline__ void neigh_release(struct neighbour *neigh)
{
if (atomic_dec_and_test(&neigh->refcnt))
neigh_destroy(neigh);
}
extern __inline__ struct neighbour * neigh_clone(struct neighbour *neigh)
{
if (neigh)
atomic_inc(&neigh->refcnt);
return neigh;
}
#define neigh_hold(n) atomic_inc(&(n)->refcnt)
extern __inline__ void neigh_confirm(struct neighbour *neigh)
{
if (neigh)
neigh->confirmed = jiffies;
}
extern __inline__ int neigh_is_connected(struct neighbour *neigh)
{
return neigh->nud_state&NUD_CONNECTED;
}
extern __inline__ int neigh_is_valid(struct neighbour *neigh)
{
return neigh->nud_state&NUD_VALID;
}
extern __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;
}
extern __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;
return neigh_create(tbl, pkey, dev);
}
#endif
#endif
