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Commit 2b3957c3 authored by Xin Long's avatar Xin Long Committed by David S. Miller
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sit: fix IFLA_MTU ignored on NEWLINK 



Commit 128bb975 ("ip6_gre: init dev->mtu and dev->hard_header_len
correctly") fixed IFLA_MTU ignored on NEWLINK for ip6_gre. The same
mtu fix is also needed for sit.

Note that dev->hard_header_len setting for sit works fine, no need to
fix it. sit is actually ipv4 tunnel, it can't call ip6_tnl_change_mtu
to set mtu.

Reported-by: default avatarJianlin Shi <jishi@redhat.com>
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a6aa8044

net/ipv6/sit.c

+7 −0
Original line number Diff line number Diff line
@@ -1578,6 +1578,13 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev, 
	if (err < 0)

		return err;



	if (tb[IFLA_MTU]) {

		u32 mtu = nla_get_u32(tb[IFLA_MTU]);



		if (mtu >= IPV6_MIN_MTU && mtu <= 0xFFF8 - dev->hard_header_len)

			dev->mtu = mtu;

	}



#ifdef CONFIG_IPV6_SIT_6RD

	if (ipip6_netlink_6rd_parms(data, &ip6rd))

		err = ipip6_tunnel_update_6rd(nt, &ip6rd);