This is a note to let you know that I've just added the patch titled

gtp: clear DF bit on GTP packet tx

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: gtp-clear-df-bit-on-gtp-packet-tx.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Wed Dec 6 17:39:55 CET 2017

From: Andreas Schultz aschultz@tpip.net Date: Fri, 27 Jan 2017 10:40:57 +0100 Subject: gtp: clear DF bit on GTP packet tx

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

Patches currently in stable-queue which might be from aschultz@tpip.net are

queue-4.9/gtp-clear-df-bit-on-gtp-packet-tx.patch queue-4.9/gtp-fix-cross-netns-recv-on-gtp-socket.patch