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82 lines
2.0 KiB
82 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* 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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#ifdef CONFIG_INET |
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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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if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) |
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key = INADDR_ANY; |
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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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#else |
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static inline |
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struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) |
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{ |
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return NULL; |
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} |
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#endif |
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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 && !refcount_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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static inline void __ipv4_confirm_neigh(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) { |
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unsigned long now = jiffies; |
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/* avoid dirtying neighbour */ |
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if (READ_ONCE(n->confirmed) != now) |
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WRITE_ONCE(n->confirmed, now); |
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} |
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rcu_read_unlock_bh(); |
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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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