1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds /* linux/net/inet/arp.h */ 31da177e4SLinus Torvalds #ifndef _ARP_H 41da177e4SLinus Torvalds #define _ARP_H 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include <linux/if_arp.h> 7b14f243aSPavel Emelyanov #include <linux/hash.h> 81da177e4SLinus Torvalds #include <net/neighbour.h> 91da177e4SLinus Torvalds 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds extern struct neigh_table arp_tbl; 121da177e4SLinus Torvalds 1360395a20SEric W. Biederman static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd) 14f610b74bSDavid S. Miller { 1560395a20SEric W. Biederman u32 key = *(const u32 *)pkey; 16b14f243aSPavel Emelyanov u32 val = key ^ hash32_ptr(dev); 17f610b74bSDavid S. Miller 1860395a20SEric W. Biederman return val * hash_rnd[0]; 19f610b74bSDavid S. Miller } 20f610b74bSDavid S. Miller 21a263b309SDavid S. Miller static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) 223769cffbSDavid Miller { 23*cd9ff4deSJim Westfall if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) 24*cd9ff4deSJim Westfall key = INADDR_ANY; 25*cd9ff4deSJim Westfall 2660395a20SEric W. Biederman return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev); 27a263b309SDavid S. Miller } 28a263b309SDavid S. Miller 29a263b309SDavid S. Miller static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key) 30a263b309SDavid S. Miller { 31a263b309SDavid S. Miller struct neighbour *n; 32a263b309SDavid S. Miller 33a263b309SDavid S. Miller rcu_read_lock_bh(); 34a263b309SDavid S. Miller n = __ipv4_neigh_lookup_noref(dev, key); 359f237430SReshetova, Elena if (n && !refcount_inc_not_zero(&n->refcnt)) 363769cffbSDavid Miller n = NULL; 373769cffbSDavid Miller rcu_read_unlock_bh(); 383769cffbSDavid Miller 393769cffbSDavid Miller return n; 403769cffbSDavid Miller } 413769cffbSDavid Miller 4263fca65dSJulian Anastasov static inline void __ipv4_confirm_neigh(struct net_device *dev, u32 key) 4363fca65dSJulian Anastasov { 4463fca65dSJulian Anastasov struct neighbour *n; 4563fca65dSJulian Anastasov 4663fca65dSJulian Anastasov rcu_read_lock_bh(); 4763fca65dSJulian Anastasov n = __ipv4_neigh_lookup_noref(dev, key); 4863fca65dSJulian Anastasov if (n) { 4963fca65dSJulian Anastasov unsigned long now = jiffies; 5063fca65dSJulian Anastasov 5163fca65dSJulian Anastasov /* avoid dirtying neighbour */ 5263fca65dSJulian Anastasov if (n->confirmed != now) 5363fca65dSJulian Anastasov n->confirmed = now; 5463fca65dSJulian Anastasov } 5563fca65dSJulian Anastasov rcu_read_unlock_bh(); 5663fca65dSJulian Anastasov } 5763fca65dSJulian Anastasov 5890972b22SJoe Perches void arp_init(void); 5990972b22SJoe Perches int arp_ioctl(struct net *net, unsigned int cmd, void __user *arg); 6090972b22SJoe Perches void arp_send(int type, int ptype, __be32 dest_ip, 61ed9bad06SAl Viro struct net_device *dev, __be32 src_ip, 62abfdf1c4SJan Engelhardt const unsigned char *dest_hw, 63abfdf1c4SJan Engelhardt const unsigned char *src_hw, const unsigned char *th); 6490972b22SJoe Perches int arp_mc_map(__be32 addr, u8 *haddr, struct net_device *dev, int dir); 6590972b22SJoe Perches void arp_ifdown(struct net_device *dev); 661da177e4SLinus Torvalds 6790972b22SJoe Perches struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip, 68ed9bad06SAl Viro struct net_device *dev, __be32 src_ip, 69abfdf1c4SJan Engelhardt const unsigned char *dest_hw, 70abfdf1c4SJan Engelhardt const unsigned char *src_hw, 71abfdf1c4SJan Engelhardt const unsigned char *target_hw); 7290972b22SJoe Perches void arp_xmit(struct sk_buff *skb); 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds #endif /* _ARP_H */ 75