diff options
Diffstat (limited to 'include/net/neighbour.h')
| -rw-r--r-- | include/net/neighbour.h | 407 |
1 files changed, 407 insertions, 0 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h new file mode 100644 index 00000000..34c996f4 --- /dev/null +++ b/include/net/neighbour.h @@ -0,0 +1,407 @@ +#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 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 |