mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-22 20:23:57 +08:00
391 lines
10 KiB
C
391 lines
10 KiB
C
#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 sk_buff *skb);
|
|
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 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_hash_table {
|
|
struct neighbour __rcu **hash_buckets;
|
|
unsigned int hash_mask;
|
|
__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 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)
|
|
{
|
|
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 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)
|
|
|
|
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
|