[libgtp] add comments with references to the GTP specification sections
diff --git a/gtp/gtp.c b/gtp/gtp.c
index 6d567ff..5e6c4ab 100644
--- a/gtp/gtp.c
+++ b/gtp/gtp.c
@@ -1004,7 +1004,7 @@
* information.
*************************************************************/
-/* API: Send Create PDP Context Request */
+/* API: Send Create PDP Context Request (7.3.1) */
extern int gtp_create_context_req(struct gsn_t *gsn, struct pdp_t *pdp,
void *cbp) {
union gtp_packet packet;
@@ -1029,15 +1029,18 @@
sizeof(pdp->qos_req0), pdp->qos_req0);
}
+ /* Section 7.7.2 */
if (pdp->version == 1) {
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
gtpie_tv0(&packet, &length, GTP_MAX, GTPIE_IMSI,
sizeof(pdp->imsi), (uint8_t*) &pdp->imsi);
}
+ /* Section 7.7.11 */
gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_RECOVERY,
gsn->restart_counter);
+ /* Section 7.7.12 */
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_SELECTION_MODE,
pdp->selmode);
@@ -1049,21 +1052,26 @@
pdp->fllc);
}
+ /* Section 7.7.13 */
if (pdp->version == 1) {
gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_DI,
pdp->teid_own);
+ /* Section 7.7.14 */
if (!pdp->teic_confirmed)
gtpie_tv4(&packet, &length, GTP_MAX, GTPIE_TEI_C,
pdp->teic_own);
+ /* Section 7.7.17 */
gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI,
pdp->nsapi);
+ /* Section 7.7.17 */
if (pdp->secondary) /* Secondary PDP Context Activation Procedure */
gtpie_tv1(&packet, &length, GTP_MAX, GTPIE_NSAPI,
linked_pdp->nsapi);
+ /* Section 7.7.23 */
if (pdp->cch_pdp) /* Only include charging if flags are set */
gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_CHARGING_C,
pdp->cch_pdp);
@@ -1075,42 +1083,51 @@
gtpie_tv2(&packet, &length, GTP_MAX, GTPIE_TRACE_TYPE,
pdp->tracetype); */
+ /* Section 7.7.27 */
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_EUA,
pdp->eua.l, pdp->eua.v);
+ /* Section 7.7.30 */
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_APN,
pdp->apn_use.l, pdp->apn_use.v);
+ /* Section 7.7.31 */
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
if (pdp->pco_req.l)
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_PCO,
pdp->pco_req.l, pdp->pco_req.v);
+ /* Section 7.7.32 */
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlc.l, pdp->gsnlc.v);
+ /* Section 7.7.32 */
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_GSN_ADDR,
pdp->gsnlu.l, pdp->gsnlu.v);
+ /* Section 7.7.33 */
if (!pdp->secondary) /* Not Secondary PDP Context Activation Procedure */
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_MSISDN,
pdp->msisdn.l, pdp->msisdn.v);
+ /* Section 7.7.34 */
if (pdp->version == 1)
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_QOS_PROFILE,
pdp->qos_req.l, pdp->qos_req.v);
-
+ /* Section 7.7.36 */
if ((pdp->version == 1) && pdp->tft.l)
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TFT,
pdp->tft.l, pdp->tft.v);
+ /* Section 7.7.41 */
if ((pdp->version == 1) && pdp->triggerid.l)
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_TRIGGER_ID,
pdp->triggerid.l, pdp->triggerid.v);
+ /* Section 7.7.42 */
if ((pdp->version == 1) && pdp->omcid.l)
gtpie_tlv(&packet, &length, GTP_MAX, GTPIE_OMC_ID,
pdp->omcid.l, pdp->omcid.v);