mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
cd9ff4de01
Map all lookup neigh keys to INADDR_ANY for loopback/point-to-point devices to avoid making an entry for every remote ip the device needs to talk to. This used the be the old behavior but became broken ina263b30936(ipv4: Make neigh lookups directly in output packet path) and later removed in0bb4087cbe(ipv4: Fix neigh lookup keying over loopback/point-to-point devices) because it was broken. Signed-off-by: Jim Westfall <jwestfall@surrealistic.net> Signed-off-by: David S. Miller <davem@davemloft.net>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/* 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];
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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 (n->confirmed != now)
|
|
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 */
|