4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Andreas Schultz <aschultz@xxxxxxxx> [ 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@xxxxxxxx> Acked-by: Harald Welte <laforge@xxxxxxxxxxxxx> Acked-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/gtp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/gtp.c +++ b/drivers/net/gtp.c @@ -612,7 +612,7 @@ static netdev_tx_t gtp_dev_xmit(struct s 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;