From: Stephen Suryaputra <ssuryaextr@gmail.com>
Date: Mon, 6 May 2019 19:00:01 +0000 (-0400)
Subject: vrf: sit mtu should not be updated when vrf netdev is the link
X-Git-Tag: v4.9.177~7
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2854d4536dea421c6badce8a6c1f04f96d1b97c5;p=platform%2Fkernel%2Flinux-amlogic.git

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

[ Upstream commit ff6ab32bd4e073976e4d8797b4d514a172cfe6cb ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index be74eee..47ca2a2 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1069,7 +1069,7 @@ 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);