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ipv4: fix confirm_addr_indev() when enable route_localnet 

When arp_ignore=3, the NIC won't reply for scope host addresses, but
if enable route_locanet, we need to reply ip address with head 127 and
scope RT_SCOPE_HOST.

Fixes: d0daebc3d6 ("ipv4: Add interface option to enable routing of 127.0.0.0/8")

Signed-off-by: Shijie Luo <luoshijie1@huawei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shijie Luo 2019-06-18 15:14:04 +00:00 committed by David S. Miller
parent d8c444d540
commit 650638a7c6
1 changed files with 8 additions and 2 deletions
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10
net/ipv4/devinet.c
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@ -1356,14 +1356,20 @@ EXPORT_SYMBOL(inet_select_addr);
static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
__be32 local, int scope)
{
unsigned char localnet_scope = RT_SCOPE_HOST;
const struct in_ifaddr *ifa;
__be32 addr = 0;
int same = 0;
if (unlikely(IN_DEV_ROUTE_LOCALNET(in_dev)))
localnet_scope = RT_SCOPE_LINK;
in_dev_for_each_ifa_rcu(ifa, in_dev) {
unsigned char min_scope = min(ifa->ifa_scope, localnet_scope);
if (!addr &&
(local == ifa->ifa_local || !local) &&
ifa->ifa_scope <= scope) {
min_scope <= scope) {
addr = ifa->ifa_local;
if (same)
break;
@ -1378,7 +1384,7 @@ static __be32 confirm_addr_indev(struct in_device *in_dev, __be32 dst,
if (inet_ifa_match(addr, ifa))
break;
/* No, then can we use new local src? */
if (ifa->ifa_scope <= scope) {
if (min_scope <= scope) {
addr = ifa->ifa_local;
break;
}