[linux-2.6-block.git] / include / net / arp.h

/* SPDX-License-Identifier: GPL-2.0 */
/* linux/net/inet/arp.h */
#ifndef _ARP_H
#define _ARP_H

#include <linux/if_arp.h>
#include <linux/hash.h>
#include <net/neighbour.h>


extern struct neigh_table arp_tbl;

static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
{
	u32 key = *(const u32 *)pkey;
	u32 val = key ^ hash32_ptr(dev);

	return val * hash_rnd[0];
}

#ifdef CONFIG_INET
static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
{
	if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
		key = INADDR_ANY;

	return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
}
#else
static inline
struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key)
{
	return NULL;
}
#endif

static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
{
	struct neighbour *n;

	rcu_read_lock_bh();
	n = __ipv4_neigh_lookup_noref(dev, key);
	if (n && !refcount_inc_not_zero(&n->refcnt))
		n = NULL;
	rcu_read_unlock_bh();

	return n;
}

static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
{
	struct neighbour *n;

	rcu_read_lock_bh();
	n = __ipv4_neigh_lookup_noref(dev, key);
	if (n) {
		unsigned long now = jiffies;

		/* avoid dirtying neighbour */
		if (READ_ONCE(n->confirmed) != now)
			WRITE_ONCE(n->confirmed, now);
	}
	rcu_read_unlock_bh();
}

void arp_init(void);
int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg);
void arp_send(int type, int ptype, __be32 dest_ip,
	      struct net_device *dev, __be32 src_ip,
	      const unsigned char *dest_hw,
	      const unsigned char *src_hw, const unsigned char *th);
int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir);
void arp_ifdown(struct net_device *dev);

struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
			   struct net_device *dev, __be32 src_ip,
			   const unsigned char *dest_hw,
			   const unsigned char *src_hw,
			   const unsigned char *target_hw);
void arp_xmit(struct sk_buff *skb);

#endif	/* _ARP_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	/* linux/net/inet/arp.h */
	3	#ifndef _ARP_H
	4	#define _ARP_H
	5
	6	#include <linux/if_arp.h>
b14f243a	7	#include <linux/hash.h>
1da177e4 LT	8	#include <net/neighbour.h>
1da177e4 LT	9
1da177e4 LT	10
	11	extern struct neigh_table arp_tbl;
	12
60395a20	13	static inline u32 arp_hashfn(const void pkey, const struct net_device dev, u32 *hash_rnd)
f610b74b	14	{
60395a20	15	u32 key = (const u32 )pkey;
b14f243a	16	u32 val = key ^ hash32_ptr(dev);
f610b74b	17
60395a20	18	return val * hash_rnd[0];
f610b74b DM	19	}
f610b74b DM	20
9b3040a6	21	#ifdef CONFIG_INET
a263b309	22	static inline struct neighbour __ipv4_neigh_lookup_noref(struct net_device dev, u32 key)
3769cffb	23	{
cd9ff4de JW	24	if (dev->flags & (IFF_LOOPBACK \| IFF_POINTOPOINT))
	25	key = INADDR_ANY;
	26
60395a20	27	return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
a263b309	28	}
9b3040a6 DA	29	#else
	30	static inline
	31	struct neighbour __ipv4_neigh_lookup_noref(struct net_device dev, u32 key)
	32	{
	33	return NULL;
	34	}
	35	#endif
a263b309 DM	36
	37	static inline struct neighbour __ipv4_neigh_lookup(struct net_device dev, u32 key)
	38	{
	39	struct neighbour *n;
	40
	41	rcu_read_lock_bh();
	42	n = __ipv4_neigh_lookup_noref(dev, key);
9f237430	43	if (n && !refcount_inc_not_zero(&n->refcnt))
a263b309	44	n = NULL;
3769cffb DM	45	rcu_read_unlock_bh();
	46
	47	return n;
	48	}
	49
63fca65d JA	50	static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key)
	51	{
	52	struct neighbour *n;
	53
	54	rcu_read_lock_bh();
	55	n = __ipv4_neigh_lookup_noref(dev, key);
	56	if (n) {
	57	unsigned long now = jiffies;
	58
	59	/* avoid dirtying neighbour */
25c7a6d1 ED	60	if (READ_ONCE(n->confirmed) != now)
25c7a6d1 ED	61	WRITE_ONCE(n->confirmed, now);
63fca65d JA	62	}
	63	rcu_read_unlock_bh();
	64	}
	65
90972b22	66	void arp_init(void);
90972b22 JP	67	int arp_ioctl(struct net net, unsigned int cmd, void __user arg);
	68	void arp_send(int type, int ptype, __be32 dest_ip,
	69	struct net_device *dev, __be32 src_ip,
	70	const unsigned char *dest_hw,
	71	const unsigned char src_hw, const unsigned char th);
	72	int arp_mc_map(__be32 addr, u8 haddr, struct net_device dev, int dir);
	73	void arp_ifdown(struct net_device *dev);
1da177e4	74
90972b22 JP	75	struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
	76	struct net_device *dev, __be32 src_ip,
	77	const unsigned char *dest_hw,
	78	const unsigned char *src_hw,
	79	const unsigned char *target_hw);
	80	void arp_xmit(struct sk_buff *skb);
1da177e4	81
1da177e4	82	#endif /* _ARP_H */