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60395a20ff
While looking at the mpls code I found myself writing yet another version of neigh_lookup_noref. We currently have __ipv4_lookup_noref and __ipv6_lookup_noref. So to make my work a little easier and to make it a smidge easier to verify/maintain the mpls code in the future I stopped and wrote ___neigh_lookup_noref. Then I rewote __ipv4_lookup_noref and __ipv6_lookup_noref in terms of this new function. I tested my new version by verifying that the same code is generated in ip_finish_output2 and ip6_finish_output2 where these functions are inlined. To get to ___neigh_lookup_noref I added a new neighbour cache table function key_eq. So that the static size of the key would be available. I also added __neigh_lookup_noref for people who want to to lookup a neighbour table entry quickly but don't know which neibhgour table they are going to look up. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
54 lines
1.4 KiB
C
54 lines
1.4 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 <linux/hash.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(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
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{
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u32 key = *(const u32 *)pkey;
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u32 val = key ^ hash32_ptr(dev);
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return val * hash_rnd[0];
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}
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static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
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{
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return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
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}
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static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
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{
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struct neighbour *n;
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rcu_read_lock_bh();
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n = __ipv4_neigh_lookup_noref(dev, key);
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if (n && !atomic_inc_not_zero(&n->refcnt))
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n = NULL;
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rcu_read_unlock_bh();
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return n;
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}
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void arp_init(void);
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int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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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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int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
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void arp_ifdown(struct net_device *dev);
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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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void arp_xmit(struct sk_buff *skb);
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#endif /* _ARP_H */
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