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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/net/arp.h
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/* 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();

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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();

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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();

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	n = __ipv4_neigh_lookup_noref(dev, key);

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	neigh_confirm(n);

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	rcu_read_unlock();

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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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int arp_invalidate(struct net_device *dev, __be32 ip, bool force);

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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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