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authorStefano Brivio <sbrivio@redhat.com>2018-04-26 19:39:09 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2018-04-27 07:29:23 +0200
commitb4331a681822b420511b3258f1c3db35001fde48 (patch)
tree4c0896b312731b897c82d2397173b234cc177795 /net
parentxfrm: Fix warning in xfrm6_tunnel_net_exit. (diff)
downloadlinux-dev-b4331a681822b420511b3258f1c3db35001fde48.tar.xz
linux-dev-b4331a681822b420511b3258f1c3db35001fde48.zip
vti6: Change minimum MTU to IPV4_MIN_MTU, vti6 can carry IPv4 too
A vti6 interface can carry IPv4 as well, so it makes no sense to enforce a minimum MTU of IPV6_MIN_MTU. If the user sets an MTU below IPV6_MIN_MTU, IPv6 will be disabled on the interface, courtesy of addrconf_notify(). Reported-by: Xin Long <lucien.xin@gmail.com> Fixes: b96f9afee4eb ("ipv4/6: use core net MTU range checking") Fixes: c6741fbed6dc ("vti6: Properly adjust vti6 MTU from MTU of lower device") Fixes: 53c81e95df17 ("ip6_vti: adjust vti mtu according to mtu of lower device") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_vti.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index c214ffec02f0..ca957dd93a29 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -669,7 +669,7 @@ static void vti6_link_config(struct ip6_tnl *t, bool keep_mtu)
else
mtu = ETH_DATA_LEN - LL_MAX_HEADER - sizeof(struct ipv6hdr);
- dev->mtu = max_t(int, mtu, IPV6_MIN_MTU);
+ dev->mtu = max_t(int, mtu, IPV4_MIN_MTU);
}
/**
@@ -881,7 +881,7 @@ static void vti6_dev_setup(struct net_device *dev)
dev->priv_destructor = vti6_dev_free;
dev->type = ARPHRD_TUNNEL6;
- dev->min_mtu = IPV6_MIN_MTU;
+ dev->min_mtu = IPV4_MIN_MTU;
dev->max_mtu = IP_MAX_MTU - sizeof(struct ipv6hdr);
dev->flags |= IFF_NOARP;
dev->addr_len = sizeof(struct in6_addr);