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Diffstat (limited to 'include/net/neighbour.h')
| -rw-r--r-- | include/net/neighbour.h | 370 |
1 files changed, 370 insertions, 0 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h new file mode 100644 index 000000000000..4f33bbc21e7f --- /dev/null +++ b/include/net/neighbour.h @@ -0,0 +1,370 @@ +#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> + * + * Changes: + * + * Harald Welte: <laforge@gnumonks.org> + * - Add neighbour cache statistics like rtstat + */ + +/* 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/netdevice.h> +#include <linux/rcupdate.h> +#include <linux/seq_file.h> + +#include <linux/err.h> +#include <linux/sysctl.h> + +#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 +{ + struct neigh_parms *next; + int (*neigh_setup)(struct neighbour *); + struct neigh_table *tbl; + int entries; + void *priv; + + 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; /* nomber 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 */ +}; + +#define NEIGH_CACHE_STAT_INC(tbl, field) \ + do { \ + preempt_disable(); \ + (per_cpu_ptr((tbl)->stats, smp_processor_id())->field)++; \ + preempt_enable(); \ + } while (0) + +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]; +}; + +/* + * 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; + atomic_t entries; + rwlock_t lock; + unsigned long last_rand; + struct neigh_parms *parms_list; + kmem_cache_t *kmem_cachep; + struct neigh_statistics *stats; + struct neighbour **hash_buckets; + unsigned int hash_mask; + __u32 hash_rnd; + unsigned int hash_chain_gc; + struct pneigh_entry **phash_buckets; +#ifdef CONFIG_PROC_FS + struct proc_dir_entry *pde; +#endif +}; + +/* 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, + 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 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 void neigh_parms_destroy(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 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 neigh_table *tbl; + 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, + int p_id, int pdev_id, + char *p_name, + proc_handler *proc_handler, + ctl_handler *strategy); +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 void neigh_parms_put(struct neigh_parms *parms) +{ + if (atomic_dec_and_test(&parms->refcnt)) + neigh_parms_destroy(parms); +} + +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_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); +} + +#define LOCALLY_ENQUEUED -2 + +#endif +#endif + + |