/* 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();
    n = __ipv4_neigh_lookup_noref(dev, key);
    if (n && !refcount_inc_not_zero(&n->refcnt))
        n = NULL;
    rcu_read_unlock();

    return n;
}

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

    rcu_read_lock();
    n = __ipv4_neigh_lookup_noref(dev, key);
    neigh_confirm(n);
    rcu_read_unlock();
}

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

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 */