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    Subject[PATCH 5.0 119/137] vrf: sit mtu should not be updated when vrf netdev is the link
    Date
    From: Stephen Suryaputra <ssuryaextr@gmail.com>

    [ 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>
    ---
    net/ipv6/sit.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/net/ipv6/sit.c
    +++ b/net/ipv6/sit.c
    @@ -1084,7 +1084,7 @@ static void ipip6_tunnel_bind_dev(struct
    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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