Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* linux/net/inet/arp.h */ |
| 3 | #ifndef _ARP_H |
| 4 | #define _ARP_H |
| 5 | |
| 6 | #include <linux/if_arp.h> |
Pavel Emelyanov | b14f243 | 2012-08-08 21:52:28 +0000 | [diff] [blame] | 7 | #include <linux/hash.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <net/neighbour.h> |
| 9 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | |
| 11 | extern struct neigh_table arp_tbl; |
| 12 | |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 13 | static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd) |
David S. Miller | f610b74 | 2011-07-11 01:37:28 -0700 | [diff] [blame] | 14 | { |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 15 | u32 key = *(const u32 *)pkey; |
Pavel Emelyanov | b14f243 | 2012-08-08 21:52:28 +0000 | [diff] [blame] | 16 | u32 val = key ^ hash32_ptr(dev); |
David S. Miller | f610b74 | 2011-07-11 01:37:28 -0700 | [diff] [blame] | 17 | |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 18 | return val * hash_rnd[0]; |
David S. Miller | f610b74 | 2011-07-11 01:37:28 -0700 | [diff] [blame] | 19 | } |
| 20 | |
David Ahern | 9b3040a | 2019-05-05 11:16:20 -0700 | [diff] [blame] | 21 | #ifdef CONFIG_INET |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 22 | static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev, u32 key) |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 23 | { |
Jim Westfall | cd9ff4d | 2018-01-14 04:18:51 -0800 | [diff] [blame] | 24 | if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) |
| 25 | key = INADDR_ANY; |
| 26 | |
Eric W. Biederman | 60395a2 | 2015-03-03 17:10:44 -0600 | [diff] [blame] | 27 | return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev); |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 28 | } |
David Ahern | 9b3040a | 2019-05-05 11:16:20 -0700 | [diff] [blame] | 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 |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 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); |
Reshetova, Elena | 9f23743 | 2017-06-30 13:07:55 +0300 | [diff] [blame] | 43 | if (n && !refcount_inc_not_zero(&n->refcnt)) |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 44 | n = NULL; |
David Miller | 3769cff | 2011-07-11 22:44:24 +0000 | [diff] [blame] | 45 | rcu_read_unlock_bh(); |
| 46 | |
| 47 | return n; |
| 48 | } |
| 49 | |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 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 */ |
Eric Dumazet | 25c7a6d | 2019-11-05 14:11:51 -0800 | [diff] [blame] | 60 | if (READ_ONCE(n->confirmed) != now) |
| 61 | WRITE_ONCE(n->confirmed, now); |
Julian Anastasov | 63fca65 | 2017-02-06 23:14:15 +0200 | [diff] [blame] | 62 | } |
| 63 | rcu_read_unlock_bh(); |
| 64 | } |
| 65 | |
Joe Perches | 90972b2 | 2013-07-31 17:31:35 -0700 | [diff] [blame] | 66 | void arp_init(void); |
Joe Perches | 90972b2 | 2013-07-31 17:31:35 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Joe Perches | 90972b2 | 2013-07-31 17:31:35 -0700 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | #endif /* _ARP_H */ |