456 lines
12 KiB
C
456 lines
12 KiB
C
#ifndef _NET_NEIGHBOUR_H
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#define _NET_NEIGHBOUR_H
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#include <linux/neighbour.h>
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/*
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* Generic neighbour manipulation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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*
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* Harald Welte: <laforge@gnumonks.org>
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* - Add neighbour cache statistics like rtstat
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*/
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#include <linux/atomic.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rcupdate.h>
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#include <linux/seq_file.h>
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#include <linux/bitmap.h>
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#include <linux/err.h>
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#include <linux/sysctl.h>
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#include <linux/workqueue.h>
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#include <net/rtnetlink.h>
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/*
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* NUD stands for "neighbor unreachability detection"
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*/
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#define NUD_IN_TIMER (NUD_INCOMPLETE|NUD_REACHABLE|NUD_DELAY|NUD_PROBE)
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#define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
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#define NUD_CONNECTED (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE)
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struct neighbour;
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enum {
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NEIGH_VAR_MCAST_PROBES,
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NEIGH_VAR_UCAST_PROBES,
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NEIGH_VAR_APP_PROBES,
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NEIGH_VAR_RETRANS_TIME,
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NEIGH_VAR_BASE_REACHABLE_TIME,
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NEIGH_VAR_DELAY_PROBE_TIME,
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NEIGH_VAR_GC_STALETIME,
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NEIGH_VAR_QUEUE_LEN_BYTES,
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NEIGH_VAR_PROXY_QLEN,
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NEIGH_VAR_ANYCAST_DELAY,
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NEIGH_VAR_PROXY_DELAY,
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NEIGH_VAR_LOCKTIME,
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#define NEIGH_VAR_DATA_MAX (NEIGH_VAR_LOCKTIME + 1)
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/* Following are used as a second way to access one of the above */
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NEIGH_VAR_QUEUE_LEN, /* same data as NEIGH_VAR_QUEUE_LEN_BYTES */
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NEIGH_VAR_RETRANS_TIME_MS, /* same data as NEIGH_VAR_RETRANS_TIME */
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NEIGH_VAR_BASE_REACHABLE_TIME_MS, /* same data as NEIGH_VAR_BASE_REACHABLE_TIME */
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/* Following are used by "default" only */
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NEIGH_VAR_GC_INTERVAL,
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NEIGH_VAR_GC_THRESH1,
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NEIGH_VAR_GC_THRESH2,
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NEIGH_VAR_GC_THRESH3,
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NEIGH_VAR_PROBE,
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NEIGH_VAR_MAX
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};
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struct neigh_parms {
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#ifdef CONFIG_NET_NS
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struct net *net;
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#endif
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struct net_device *dev;
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struct neigh_parms *next;
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int (*neigh_setup)(struct neighbour *);
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void (*neigh_cleanup)(struct neighbour *);
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struct neigh_table *tbl;
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void *sysctl_table;
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int dead;
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atomic_t refcnt;
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struct rcu_head rcu_head;
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int reachable_time;
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int data[NEIGH_VAR_DATA_MAX];
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DECLARE_BITMAP(data_state, NEIGH_VAR_DATA_MAX);
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};
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static inline void neigh_var_set(struct neigh_parms *p, int index, int val)
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{
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set_bit(index, p->data_state);
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p->data[index] = val;
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}
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#define NEIGH_VAR(p, attr) ((p)->data[NEIGH_VAR_ ## attr])
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/* In ndo_neigh_setup, NEIGH_VAR_INIT should be used.
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* In other cases, NEIGH_VAR_SET should be used.
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*/
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#define NEIGH_VAR_INIT(p, attr, val) (NEIGH_VAR(p, attr) = val)
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#define NEIGH_VAR_SET(p, attr, val) neigh_var_set(p, NEIGH_VAR_ ## attr, val)
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static inline void neigh_parms_data_state_setall(struct neigh_parms *p)
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{
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bitmap_fill(p->data_state, NEIGH_VAR_DATA_MAX);
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}
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static inline void neigh_parms_data_state_cleanall(struct neigh_parms *p)
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{
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bitmap_zero(p->data_state, NEIGH_VAR_DATA_MAX);
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}
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struct neigh_statistics {
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unsigned long allocs; /* number of allocated neighs */
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unsigned long destroys; /* number of destroyed neighs */
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unsigned long hash_grows; /* number of hash resizes */
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unsigned long res_failed; /* number of failed resolutions */
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unsigned long lookups; /* number of lookups */
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unsigned long hits; /* number of hits (among lookups) */
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unsigned long rcv_probes_mcast; /* number of received mcast ipv6 */
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unsigned long rcv_probes_ucast; /* number of received ucast ipv6 */
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unsigned long periodic_gc_runs; /* number of periodic GC runs */
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unsigned long forced_gc_runs; /* number of forced GC runs */
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unsigned long unres_discards; /* number of unresolved drops */
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};
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#define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
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struct neighbour {
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struct neighbour __rcu *next;
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struct neigh_table *tbl;
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struct neigh_parms *parms;
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unsigned long confirmed;
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unsigned long updated;
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rwlock_t lock;
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atomic_t refcnt;
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struct sk_buff_head arp_queue;
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unsigned int arp_queue_len_bytes;
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struct timer_list timer;
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unsigned long used;
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atomic_t probes;
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__u8 flags;
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__u8 nud_state;
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__u8 type;
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__u8 dead;
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seqlock_t ha_lock;
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unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
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struct hh_cache hh;
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int (*output)(struct neighbour *, struct sk_buff *);
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const struct neigh_ops *ops;
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struct rcu_head rcu;
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struct net_device *dev;
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u8 primary_key[0];
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};
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struct neigh_ops {
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int family;
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void (*solicit)(struct neighbour *, struct sk_buff *);
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void (*error_report)(struct neighbour *, struct sk_buff *);
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int (*output)(struct neighbour *, struct sk_buff *);
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int (*connected_output)(struct neighbour *, struct sk_buff *);
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};
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struct pneigh_entry {
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struct pneigh_entry *next;
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#ifdef CONFIG_NET_NS
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struct net *net;
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#endif
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struct net_device *dev;
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u8 flags;
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u8 key[0];
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};
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/*
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* neighbour table manipulation
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*/
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#define NEIGH_NUM_HASH_RND 4
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struct neigh_hash_table {
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struct neighbour __rcu **hash_buckets;
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unsigned int hash_shift;
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__u32 hash_rnd[NEIGH_NUM_HASH_RND];
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struct rcu_head rcu;
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};
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struct neigh_table {
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struct neigh_table *next;
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int family;
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int entry_size;
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int key_len;
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__u32 (*hash)(const void *pkey,
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const struct net_device *dev,
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__u32 *hash_rnd);
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int (*constructor)(struct neighbour *);
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int (*pconstructor)(struct pneigh_entry *);
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void (*pdestructor)(struct pneigh_entry *);
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void (*proxy_redo)(struct sk_buff *skb);
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char *id;
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struct neigh_parms parms;
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int gc_interval;
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int gc_thresh1;
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int gc_thresh2;
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int gc_thresh3;
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unsigned long last_flush;
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struct delayed_work gc_work;
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struct timer_list proxy_timer;
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struct sk_buff_head proxy_queue;
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atomic_t entries;
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rwlock_t lock;
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unsigned long last_rand;
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struct neigh_statistics __percpu *stats;
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struct neigh_hash_table __rcu *nht;
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struct pneigh_entry **phash_buckets;
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};
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static inline int neigh_parms_family(struct neigh_parms *p)
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{
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return p->tbl->family;
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}
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#define NEIGH_PRIV_ALIGN sizeof(long long)
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#define NEIGH_ENTRY_SIZE(size) ALIGN((size), NEIGH_PRIV_ALIGN)
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static inline void *neighbour_priv(const struct neighbour *n)
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{
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return (char *)n + n->tbl->entry_size;
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}
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/* flags for neigh_update() */
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#define NEIGH_UPDATE_F_OVERRIDE 0x00000001
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#define NEIGH_UPDATE_F_WEAK_OVERRIDE 0x00000002
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#define NEIGH_UPDATE_F_OVERRIDE_ISROUTER 0x00000004
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#define NEIGH_UPDATE_F_ISROUTER 0x40000000
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#define NEIGH_UPDATE_F_ADMIN 0x80000000
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void neigh_table_init(struct neigh_table *tbl);
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int neigh_table_clear(struct neigh_table *tbl);
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struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
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struct net_device *dev);
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struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net,
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const void *pkey);
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struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey,
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struct net_device *dev, bool want_ref);
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static inline struct neighbour *neigh_create(struct neigh_table *tbl,
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const void *pkey,
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struct net_device *dev)
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{
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return __neigh_create(tbl, pkey, dev, true);
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}
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void neigh_destroy(struct neighbour *neigh);
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int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb);
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int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, u32 flags);
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void __neigh_set_probe_once(struct neighbour *neigh);
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void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
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int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
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int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb);
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int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb);
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int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb);
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int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb);
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struct neighbour *neigh_event_ns(struct neigh_table *tbl,
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u8 *lladdr, void *saddr,
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struct net_device *dev);
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struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
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struct neigh_table *tbl);
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void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms);
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static inline
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struct net *neigh_parms_net(const struct neigh_parms *parms)
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{
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return read_pnet(&parms->net);
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}
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unsigned long neigh_rand_reach_time(unsigned long base);
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void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
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struct sk_buff *skb);
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struct pneigh_entry *pneigh_lookup(struct neigh_table *tbl, struct net *net,
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const void *key, struct net_device *dev,
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int creat);
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struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, struct net *net,
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const void *key, struct net_device *dev);
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int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *key,
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struct net_device *dev);
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static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
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{
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return read_pnet(&pneigh->net);
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}
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void neigh_app_ns(struct neighbour *n);
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void neigh_for_each(struct neigh_table *tbl,
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void (*cb)(struct neighbour *, void *), void *cookie);
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void __neigh_for_each_release(struct neigh_table *tbl,
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int (*cb)(struct neighbour *));
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void pneigh_for_each(struct neigh_table *tbl,
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void (*cb)(struct pneigh_entry *));
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struct neigh_seq_state {
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struct seq_net_private p;
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struct neigh_table *tbl;
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struct neigh_hash_table *nht;
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void *(*neigh_sub_iter)(struct neigh_seq_state *state,
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struct neighbour *n, loff_t *pos);
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unsigned int bucket;
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unsigned int flags;
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#define NEIGH_SEQ_NEIGH_ONLY 0x00000001
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#define NEIGH_SEQ_IS_PNEIGH 0x00000002
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#define NEIGH_SEQ_SKIP_NOARP 0x00000004
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};
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void *neigh_seq_start(struct seq_file *, loff_t *, struct neigh_table *,
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unsigned int);
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void *neigh_seq_next(struct seq_file *, void *, loff_t *);
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void neigh_seq_stop(struct seq_file *, void *);
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int neigh_proc_dointvec(struct ctl_table *ctl, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos);
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int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write,
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void __user *buffer,
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size_t *lenp, loff_t *ppos);
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int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
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proc_handler *proc_handler);
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void neigh_sysctl_unregister(struct neigh_parms *p);
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static inline void __neigh_parms_put(struct neigh_parms *parms)
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{
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atomic_dec(&parms->refcnt);
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}
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static inline struct neigh_parms *neigh_parms_clone(struct neigh_parms *parms)
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{
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atomic_inc(&parms->refcnt);
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return parms;
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}
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/*
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* Neighbour references
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*/
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static inline void neigh_release(struct neighbour *neigh)
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{
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if (atomic_dec_and_test(&neigh->refcnt))
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neigh_destroy(neigh);
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}
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static inline struct neighbour * neigh_clone(struct neighbour *neigh)
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{
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if (neigh)
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atomic_inc(&neigh->refcnt);
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return neigh;
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}
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#define neigh_hold(n) atomic_inc(&(n)->refcnt)
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static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
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{
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unsigned long now = jiffies;
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if (neigh->used != now)
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neigh->used = now;
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if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
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return __neigh_event_send(neigh, skb);
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return 0;
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}
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#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
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static inline int neigh_hh_bridge(struct hh_cache *hh, struct sk_buff *skb)
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{
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unsigned int seq, hh_alen;
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do {
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seq = read_seqbegin(&hh->hh_lock);
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hh_alen = HH_DATA_ALIGN(ETH_HLEN);
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memcpy(skb->data - hh_alen, hh->hh_data, ETH_ALEN + hh_alen - ETH_HLEN);
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} while (read_seqretry(&hh->hh_lock, seq));
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return 0;
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}
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#endif
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static inline int neigh_hh_output(const struct hh_cache *hh, struct sk_buff *skb)
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{
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unsigned int seq;
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int hh_len;
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do {
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seq = read_seqbegin(&hh->hh_lock);
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hh_len = hh->hh_len;
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if (likely(hh_len <= HH_DATA_MOD)) {
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/* this is inlined by gcc */
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memcpy(skb->data - HH_DATA_MOD, hh->hh_data, HH_DATA_MOD);
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} else {
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int hh_alen = HH_DATA_ALIGN(hh_len);
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memcpy(skb->data - hh_alen, hh->hh_data, hh_alen);
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}
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} while (read_seqretry(&hh->hh_lock, seq));
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skb_push(skb, hh_len);
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return dev_queue_xmit(skb);
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}
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static inline struct neighbour *
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__neigh_lookup(struct neigh_table *tbl, const void *pkey, struct net_device *dev, int creat)
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{
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struct neighbour *n = neigh_lookup(tbl, pkey, dev);
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if (n || !creat)
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return n;
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n = neigh_create(tbl, pkey, dev);
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return IS_ERR(n) ? NULL : n;
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}
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static inline struct neighbour *
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__neigh_lookup_errno(struct neigh_table *tbl, const void *pkey,
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struct net_device *dev)
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{
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struct neighbour *n = neigh_lookup(tbl, pkey, dev);
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if (n)
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return n;
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return neigh_create(tbl, pkey, dev);
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}
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struct neighbour_cb {
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unsigned long sched_next;
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unsigned int flags;
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};
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#define LOCALLY_ENQUEUED 0x1
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#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
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static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
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const struct net_device *dev)
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{
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unsigned int seq;
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do {
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seq = read_seqbegin(&n->ha_lock);
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memcpy(dst, n->ha, dev->addr_len);
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} while (read_seqretry(&n->ha_lock, seq));
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}
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#endif
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