| #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 <linux/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 <linux/workqueue.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_bytes; |
| 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; /* number 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 */ |
| |
| unsigned long unres_discards; /* number of unresolved drops */ |
| }; |
| |
| #define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field) |
| |
| struct neighbour { |
| struct neighbour __rcu *next; |
| struct neigh_table *tbl; |
| struct neigh_parms *parms; |
| unsigned long confirmed; |
| unsigned long updated; |
| rwlock_t lock; |
| atomic_t refcnt; |
| struct sk_buff_head arp_queue; |
| unsigned int arp_queue_len_bytes; |
| struct timer_list timer; |
| unsigned long used; |
| atomic_t probes; |
| __u8 flags; |
| __u8 nud_state; |
| __u8 type; |
| __u8 dead; |
| seqlock_t ha_lock; |
| unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))]; |
| struct hh_cache hh; |
| int (*output)(struct neighbour *, struct sk_buff *); |
| const struct neigh_ops *ops; |
| struct rcu_head rcu; |
| struct net_device *dev; |
| 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 neighbour *, struct sk_buff *); |
| int (*connected_output)(struct neighbour *, 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 |
| */ |
| |
| #define NEIGH_NUM_HASH_RND 4 |
| |
| struct neigh_hash_table { |
| struct neighbour __rcu **hash_buckets; |
| unsigned int hash_shift; |
| __u32 hash_rnd[NEIGH_NUM_HASH_RND]; |
| struct rcu_head rcu; |
| }; |
| |
| |
| struct neigh_table { |
| struct neigh_table *next; |
| int family; |
| int entry_size; |
| int key_len; |
| __u32 (*hash)(const void *pkey, |
| const struct net_device *dev, |
| __u32 *hash_rnd); |
| 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_* should follow parms without a gap! */ |
| int gc_interval; |
| int gc_thresh1; |
| int gc_thresh2; |
| int gc_thresh3; |
| unsigned long last_flush; |
| struct delayed_work gc_work; |
| struct timer_list proxy_timer; |
| struct sk_buff_head proxy_queue; |
| atomic_t entries; |
| rwlock_t lock; |
| unsigned long last_rand; |
| struct neigh_statistics __percpu *stats; |
| struct neigh_hash_table __rcu *nht; |
| struct pneigh_entry **phash_buckets; |
| }; |
| |
| #define NEIGH_PRIV_ALIGN sizeof(long long) |
| |
| static inline void *neighbour_priv(const struct neighbour *n) |
| { |
| return (char *)n + ALIGN(sizeof(*n) + n->tbl->key_len, NEIGH_PRIV_ALIGN); |
| } |
| |
| /* 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, |
| struct net *net, |
| const void *pkey); |
| extern struct neighbour * __neigh_create(struct neigh_table *tbl, |
| const void *pkey, |
| struct net_device *dev, |
| bool want_ref); |
| static inline struct neighbour *neigh_create(struct neigh_table *tbl, |
| const void *pkey, |
| struct net_device *dev) |
| { |
| return __neigh_create(tbl, pkey, dev, true); |
| } |
| 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 neighbour *neigh, struct sk_buff *skb); |
| extern int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb); |
| extern int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb); |
| extern int neigh_direct_output(struct neighbour *neigh, 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) |
| { |
| return read_pnet(&parms->net); |
| } |
| |
| 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) |
| { |
| return read_pnet(&pneigh->net); |
| } |
| |
| 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; |
| struct neigh_hash_table *nht; |
| 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, |
| char *p_name, |
| proc_handler *proc_handler); |
| 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) |
| { |
| unsigned long now = jiffies; |
| |
| if (neigh->used != now) |
| neigh->used = now; |
| if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE))) |
| return __neigh_event_send(neigh, skb); |
| return 0; |
| } |
| |
| #ifdef CONFIG_BRIDGE_NETFILTER |
| static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb) |
| { |
| unsigned int seq, hh_alen; |
| |
| do { |
| seq = read_seqbegin(&hh->hh_lock); |
| hh_alen = HH_DATA_ALIGN(ETH_HLEN); |
| memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN); |
| } while (read_seqretry(&hh->hh_lock, seq)); |
| return 0; |
| } |
| #endif |
| |
| static inline int neigh_hh_output(struct hh_cache *hh, struct sk_buff *skb) |
| { |
| unsigned int 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 dev_queue_xmit(skb); |
| } |
| |
| static inline int neigh_output(struct neighbour *n, struct sk_buff *skb) |
| { |
| struct hh_cache *hh = &n->hh; |
| if ((n->nud_state & NUD_CONNECTED) && hh->hh_len) |
| return neigh_hh_output(hh, skb); |
| else |
| return n->output(n, 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) |
| |
| static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n, |
| const struct net_device *dev) |
| { |
| unsigned int seq; |
| |
| do { |
| seq = read_seqbegin(&n->ha_lock); |
| memcpy(dst, n->ha, dev->addr_len); |
| } while (read_seqretry(&n->ha_lock, seq)); |
| } |
| #endif |
