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    Subject[PATCH AUTOSEL for 4.9 44/54] gtp: clear DF bit on GTP packet tx
    Date
    From: Andreas Schultz <aschultz@tpip.net>

    [ Upstream commit c6ce1d08eede4c2968ed08aafa3165e8e183c5a1 ]

    3GPP TS 29.281 and 3GPP TS 29.060 imply that GTP-U packets should be
    sent with the DF bit cleared. For example 3GPP TS 29.060, Release 8,
    Section 13.2.2:

    > Backbone router: Any router in the backbone may fragment the GTP
    > packet if needed, according to IPv4.

    Signed-off-by: Andreas Schultz <aschultz@tpip.net>
    Acked-by: Harald Welte <laforge@netfilter.org>
    Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
    ---
    drivers/net/gtp.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
    index cebde074d196..5b67f8a8b79a 100644
    --- a/drivers/net/gtp.c
    +++ b/drivers/net/gtp.c
    @@ -612,7 +612,7 @@ static netdev_tx_t gtp_dev_xmit(struct sk_buff *skb, struct net_device *dev)
    pktinfo.fl4.saddr, pktinfo.fl4.daddr,
    pktinfo.iph->tos,
    ip4_dst_hoplimit(&pktinfo.rt->dst),
    - htons(IP_DF),
    + 0,
    pktinfo.gtph_port, pktinfo.gtph_port,
    true, false);
    break;
    --
    2.11.0
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