forked from Minki/linux
3769cffb1c
Get rid of all of the useless and costly indirection
by doing the neigh hash table lookup directly inside
of the neighbour binding.
Rename from arp_bind_neighbour to rt_bind_neighbour.
Use new helpers {__,}ipv4_neigh_lookup()
In rt_bind_neighbour() get rid of useless tests which
are never true in the context this function is called,
namely dev is never NULL and the dst->neighbour is
always NULL.
Signed-off-by: David S. Miller <davem@davemloft.net>
69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
/* linux/net/inet/arp.h */
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#ifndef _ARP_H
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#define _ARP_H
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#include <linux/if_arp.h>
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#include <net/neighbour.h>
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extern struct neigh_table arp_tbl;
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static inline u32 arp_hashfn(u32 key, const struct net_device *dev, u32 hash_rnd)
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{
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u32 val = key ^ dev->ifindex;
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return val * hash_rnd;
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}
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static inline struct neighbour *__ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, u32 key)
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{
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struct neigh_hash_table *nht;
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struct neighbour *n;
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u32 hash_val;
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rcu_read_lock_bh();
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nht = rcu_dereference_bh(tbl->nht);
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hash_val = arp_hashfn(key, dev, nht->hash_rnd) >> (32 - nht->hash_shift);
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for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]);
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n != NULL;
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n = rcu_dereference_bh(n->next)) {
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if (n->dev == dev && *(u32 *)n->primary_key == key) {
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if (!atomic_inc_not_zero(&n->refcnt))
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n = NULL;
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break;
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}
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}
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rcu_read_unlock_bh();
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return n;
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}
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static inline struct neighbour *ipv4_neigh_lookup(struct neigh_table *tbl, struct net_device *dev, const __be32 *pkey)
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{
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struct neighbour *n = __ipv4_neigh_lookup(tbl, dev,
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*(__force u32 *)pkey);
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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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extern void arp_init(void);
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extern int arp_find(unsigned char *haddr, struct sk_buff *skb);
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extern int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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extern void arp_send(int type, int ptype, __be32 dest_ip,
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struct net_device *dev, __be32 src_ip,
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const unsigned char *dest_hw,
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const unsigned char *src_hw, const unsigned char *th);
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extern int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
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extern void arp_ifdown(struct net_device *dev);
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extern struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
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struct net_device *dev, __be32 src_ip,
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const unsigned char *dest_hw,
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const unsigned char *src_hw,
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const unsigned char *target_hw);
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extern void arp_xmit(struct sk_buff *skb);
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int arp_invalidate(struct net_device *dev, __be32 ip);
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#endif /* _ARP_H */
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