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authorShijie Luo <luoshijie1@huawei.com>2019-06-18 18:14:04 +0300
committerDavid S. Miller <davem@davemloft.net>2019-06-24 19:02:47 +0300
commit650638a7c6e60a198573873972aafb065f200056 (patch)
tree166e0579777bd8bc91309f9da84dd8420f7c22b0
parentd8c444d540beaa39aff834c5b83df7e86a1ae765 (diff)
downloadlinux-650638a7c6e60a198573873972aafb065f200056.tar.xz
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: d0daebc3d622 ("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>
-rw-r--r--net/ipv4/devinet.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 6fd4628d10b9..7874303220c5 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -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;
}