| #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 <asm/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 <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; | |
| 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[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; | |
| 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 (*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; | |
| #ifdef CONFIG_NET_NS | |
| struct net *net; | |
| #endif | |
| struct net_device *dev; | |
| u8 flags; | |
| 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 kmem_cache *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 void neigh_table_init_no_netlink(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); | |
| 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); | |
| static inline | |
| struct net *neigh_parms_net(const struct neigh_parms *parms) | |
| { | |
| #ifdef CONFIG_NET_NS | |
| return parms->net; | |
| #else | |
| return &init_net; | |
| #endif | |
| } | |
| 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) | |
| { | |
| #ifdef CONFIG_NET_NS | |
| return pneigh->net; | |
| #else | |
| return &init_net; | |
| #endif | |
| } | |
| 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; | |
| 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 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_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 int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) | |
| { | |
| unsigned seq; | |
| int hh_len; | |
| do { | |
| int hh_alen; | |
| seq = read_seqbegin(&hh->hh_lock); | |
| hh_len = hh->hh_len; | |
| 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 hh->hh_output(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) | |
| #endif |