#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 <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; 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; 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 */ struct neigh_hash_table { struct neighbour __rcu **hash_buckets; unsigned int hash_shift; __u32 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 kmem_cache *kmem_cachep; struct neigh_statistics __percpu *stats; struct neigh_hash_table __rcu *nht; struct pneigh_entry **phash_buckets; }; /* 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 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 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 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