libgtp: Allow each PDP context to specify if it transmits G-PDU sequence numbers

GTP sequence numbers on GTP-U are optional for G-PDU type messages (i.e.
user-ip messages).  Let's allow the user to specify this behavior by
a new pdu_t.tx_gpdu_seq flag.  The flag is enabled by default to stay
compatible with the prior behaviour.

Related: OS#2519
Change-Id: Icf22a2ddd5c4a968ef5bda7c202b921d93fb49e6

1 files changed, 2 insertions, 0 deletions

diff --git a/gtp/pdp.c b/gtp/pdp.c
index ff9c681..d3e9232 100644
--- a/gtp/pdp.c
+++ b/gtp/pdp.c
@@ -149,6 +149,8 @@ int pdp_newpdp(struct pdp_t **pdp, uint64_t imsi, uint8_t nsapi,
 				     1].secondary_tei[(*pdp)->nsapi & 0x0f] =
 				    (*pdp)->teid_own;
 			}
+			/* Default: Generate G-PDU sequence numbers on Tx */
+			(*pdp)->tx_gpdu_seq = true;
 
 			return 0;
 		}