ipv4: fix confirm_addr_indev() when enable route_localnet (650638a7) · Commits · 戴 / test

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: ("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>

net/ipv4/devinet.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -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;
		}

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