Commit ff6ab32b authored May 06, 2019 by Stephen Suryaputra Committed by David S. Miller May 07, 2019

vrf: sit mtu should not be updated when vrf netdev is the link



VRF netdev mtu isn't typically set and have an mtu of 65536. When the
link of a tunnel is set, the tunnel mtu is changed from 1480 to the link
mtu minus tunnel header. In the case of VRF netdev is the link, then the
tunnel mtu becomes 65516. So, fix it by not setting the tunnel mtu in
this case.

Signed-off-by: Stephen Suryaputra <ssuryaextr@gmail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 68be9302

net/ipv6/sit.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -1084,7 +1084,7 @@ static void ipip6_tunnel_bind_dev(struct net_device *dev)
		if (!tdev && tunnel->parms.link)
		tdev = __dev_get_by_index(tunnel->net, tunnel->parms.link);

		if (tdev) {
		if (tdev && !netif_is_l3_master(tdev)) {
		int t_hlen = tunnel->hlen + sizeof(struct iphdr);

		dev->hard_header_len = tdev->hard_header_len + sizeof(struct iphdr);

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