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gtp: Store rx Direct Tunnel Flags in UpdatePDPCtx{Req,Resp}

In Update PDP Ctx Response, only SGSN is expected to transmit Direct
Tunnel Flags in the message.

Related: SYS#5435
Change-Id: Ia3e360a35d30858eab1e438dc2508fd756c2e22e
---
M gtp/gtp.c
1 file changed, 24 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/95/37595/1

diff --git a/gtp/gtp.c b/gtp/gtp.c
index 62cad60..8736cad 100644
--- a/gtp/gtp.c
+++ b/gtp/gtp.c
@@ -1984,6 +1984,11 @@
 		}
 
 		/* OMC identity */
+
+		/* Direct Tunnel Flags */
+		if (gtpie_gettlv(ie, GTPIE_DIR_TUN_FLAGS, 0, &pdp->dir_tun_flags.l,
+				 &pdp->dir_tun_flags.v, sizeof(pdp->dir_tun_flags.v))) {
+		}
 	}
 
 	/* Confirm to peer that things were "successful" */
@@ -2093,6 +2098,12 @@
 			     &pdp->qos_neg.v, sizeof(pdp->qos_neg.v))) {
 				goto err_missing;
 			}
+
+			/* Direct Tunnel Flags */
+			if (gsn->mode == GTP_MODE_GGSN &&
+			    gtpie_gettlv(ie, GTPIE_DIR_TUN_FLAGS, 0, &pdp->dir_tun_flags.l,
+					&pdp->dir_tun_flags.v, sizeof(pdp->dir_tun_flags.v))) {
+			}
 		}
 	}
 

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