| #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> |
| |
| #include <linux/err.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 |
| */ |
| |
| 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_is_connected(struct neighbour *neigh) |
| { |
| return neigh->nud_state&NUD_CONNECTED; |
| } |
| |
| static inline int neigh_is_valid(struct neighbour *neigh) |
| { |
| return neigh->nud_state&NUD_VALID; |
| } |
| |
| 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 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); |
| } |
| |
| #endif |
| #endif |
| |
| |
