From 650638a7c6e60a198573873972aafb065f200056 Mon Sep 17 00:00:00 2001 From: Shijie Luo Date: Tue, 18 Jun 2019 15:14:04 +0000 Subject: [PATCH] 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 Signed-off-by: Zhiqiang Liu Signed-off-by: David S. Miller --- net/ipv4/devinet.c | 10 ++++++++-- 1 file 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; } -- 2.30.2