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phoenix |
#ifndef _NET_NEIGHBOUR_H
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#define _NET_NEIGHBOUR_H
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/*
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* Generic neighbour manipulation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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*/
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/* The following flags & states are exported to user space,
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so that they should be moved to include/linux/ directory.
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*/
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/*
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* Neighbor Cache Entry Flags
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*/
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#define NTF_PROXY 0x08 /* == ATF_PUBL */
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#define NTF_ROUTER 0x80
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/*
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* Neighbor Cache Entry States.
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*/
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#define NUD_INCOMPLETE 0x01
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#define NUD_REACHABLE 0x02
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#define NUD_STALE 0x04
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#define NUD_DELAY 0x08
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#define NUD_PROBE 0x10
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#define NUD_FAILED 0x20
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/* Dummy states */
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#define NUD_NOARP 0x40
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#define NUD_PERMANENT 0x80
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#define NUD_NONE 0x00
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/* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
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and make no address resolution or NUD.
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NUD_PERMANENT is also cannot be deleted by garbage collectors.
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*/
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#ifdef __KERNEL__
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#include <asm/atomic.h>
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#include <linux/skbuff.h>
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#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE)
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#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
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#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
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struct neigh_parms
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{
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struct neigh_parms *next;
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int (*neigh_setup)(struct neighbour *);
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struct neigh_table *tbl;
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int entries;
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void *priv;
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void *sysctl_table;
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int base_reachable_time;
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int retrans_time;
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int gc_staletime;
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int reachable_time;
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int delay_probe_time;
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int queue_len;
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int ucast_probes;
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int app_probes;
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int mcast_probes;
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int anycast_delay;
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int proxy_delay;
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int proxy_qlen;
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int locktime;
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};
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struct neigh_statistics
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{
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unsigned long allocs;
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unsigned long res_failed;
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unsigned long rcv_probes_mcast;
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unsigned long rcv_probes_ucast;
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};
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struct neighbour
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{
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struct neighbour *next;
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struct neigh_table *tbl;
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struct neigh_parms *parms;
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struct net_device *dev;
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unsigned long used;
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unsigned long confirmed;
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unsigned long updated;
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__u8 flags;
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__u8 nud_state;
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__u8 type;
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__u8 dead;
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atomic_t probes;
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rwlock_t lock;
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unsigned char ha[(MAX_ADDR_LEN+sizeof(unsigned long)-1)&~(sizeof(unsigned long)-1)];
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struct hh_cache *hh;
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atomic_t refcnt;
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int (*output)(struct sk_buff *skb);
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struct sk_buff_head arp_queue;
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struct timer_list timer;
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struct neigh_ops *ops;
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u8 primary_key[0];
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};
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struct neigh_ops
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{
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int family;
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void (*destructor)(struct neighbour *);
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void (*solicit)(struct neighbour *, struct sk_buff*);
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void (*error_report)(struct neighbour *, struct sk_buff*);
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int (*output)(struct sk_buff*);
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int (*connected_output)(struct sk_buff*);
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int (*hh_output)(struct sk_buff*);
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int (*queue_xmit)(struct sk_buff*);
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};
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struct pneigh_entry
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{
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struct pneigh_entry *next;
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struct net_device *dev;
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u8 key[0];
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};
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#define NEIGH_HASHMASK 0x1F
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#define PNEIGH_HASHMASK 0xF
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/*
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* neighbour table manipulation
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*/
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struct neigh_table
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{
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struct neigh_table *next;
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int family;
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int entry_size;
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int key_len;
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__u32 (*hash)(const void *pkey, const struct net_device *);
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int (*constructor)(struct neighbour *);
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int (*pconstructor)(struct pneigh_entry *);
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void (*pdestructor)(struct pneigh_entry *);
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void (*proxy_redo)(struct sk_buff *skb);
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char *id;
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struct neigh_parms parms;
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/* HACK. gc_* shoul follow parms without a gap! */
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int gc_interval;
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int gc_thresh1;
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int gc_thresh2;
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int gc_thresh3;
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unsigned long last_flush;
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struct timer_list gc_timer;
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struct timer_list proxy_timer;
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struct sk_buff_head proxy_queue;
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int entries;
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rwlock_t lock;
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unsigned long last_rand;
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struct neigh_parms *parms_list;
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kmem_cache_t *kmem_cachep;
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struct tasklet_struct gc_task;
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struct neigh_statistics stats;
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struct neighbour *hash_buckets[NEIGH_HASHMASK+1];
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struct pneigh_entry *phash_buckets[PNEIGH_HASHMASK+1];
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};
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extern void neigh_table_init(struct neigh_table *tbl);
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extern int neigh_table_clear(struct neigh_table *tbl);
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extern struct neighbour * neigh_lookup(struct neigh_table *tbl,
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const void *pkey,
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struct net_device *dev);
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extern struct neighbour * neigh_create(struct neigh_table *tbl,
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const void *pkey,
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struct net_device *dev);
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extern void neigh_destroy(struct neighbour *neigh);
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extern int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
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extern int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, int override, int arp);
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extern void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
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extern int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
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extern int neigh_resolve_output(struct sk_buff *skb);
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extern int neigh_connected_output(struct sk_buff *skb);
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extern int neigh_compat_output(struct sk_buff *skb);
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extern struct neighbour *neigh_event_ns(struct neigh_table *tbl,
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u8 *lladdr, void *saddr,
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struct net_device *dev);
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extern struct neigh_parms *neigh_parms_alloc(struct net_device *dev, struct neigh_table *tbl);
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extern void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
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extern unsigned long neigh_rand_reach_time(unsigned long base);
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extern void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
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struct sk_buff *skb);
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extern struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, const void *key, struct net_device *dev, int creat);
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extern int pneigh_delete(struct neigh_table *tbl, const void *key, struct net_device *dev);
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struct netlink_callback;
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struct nlmsghdr;
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extern int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb);
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extern int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
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extern int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
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extern void neigh_app_ns(struct neighbour *n);
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extern int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
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int p_id, int pdev_id, char *p_name);
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extern void neigh_sysctl_unregister(struct neigh_parms *p);
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/*
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* Neighbour references
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*/
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static inline void neigh_release(struct neighbour *neigh)
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{
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if (atomic_dec_and_test(&neigh->refcnt))
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neigh_destroy(neigh);
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}
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static inline struct neighbour * neigh_clone(struct neighbour *neigh)
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{
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if (neigh)
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atomic_inc(&neigh->refcnt);
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return neigh;
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}
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#define neigh_hold(n) atomic_inc(&(n)->refcnt)
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static inline void neigh_confirm(struct neighbour *neigh)
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{
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if (neigh)
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neigh->confirmed = jiffies;
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}
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static inline int neigh_is_connected(struct neighbour *neigh)
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{
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return neigh->nud_state&NUD_CONNECTED;
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}
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static inline int neigh_is_valid(struct neighbour *neigh)
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{
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return neigh->nud_state&NUD_VALID;
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}
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static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
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{
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neigh->used = jiffies;
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if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
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return __neigh_event_send(neigh, skb);
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return 0;
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}
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static inline struct neighbour *
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__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
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{
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struct neighbour *n = neigh_lookup(tbl, pkey, dev);
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if (n || !creat)
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return n;
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n = neigh_create(tbl, pkey, dev);
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return IS_ERR(n) ? NULL : n;
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}
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static inline struct neighbour *
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__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
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struct net_device *dev)
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{
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struct neighbour *n = neigh_lookup(tbl, pkey, dev);
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if (n)
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return n;
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return neigh_create(tbl, pkey, dev);
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}
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#endif
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#endif
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