sgsn: Add PDP info to subscriber data (TODO)

TODO:
  - commit message
  - raw binary representation ???
  - tests

Sponsored-by: On-Waves ehf

2 files changed, 31 insertions, 0 deletions

diff --git a/openbsc/include/openbsc/gprs_sgsn.h b/openbsc/include/openbsc/gprs_sgsn.h
index 00cf5ccef..ad7463e3e 100644
--- a/openbsc/include/openbsc/gprs_sgsn.h
+++ b/openbsc/include/openbsc/gprs_sgsn.h
@@ -271,6 +271,22 @@ struct imsi_acl_entry {
 	char imsi[16+1];
 };
 
+/* see GSM 09.02, 17.7.1, PDP-Context and GPRSSubscriptionData */
+/* see GSM 09.02, B.1, gprsSubscriptionData */
+struct sgsn_subscriber_pdp_data {
+	struct llist_head	list;
+
+	/* raw binary data */
+	int		pdp_context_id;
+	uint8_t		pdp_type[2];
+	uint8_t		pdp_address[16];
+	size_t		pdp_address_size;	/* 0: not present */
+	uint8_t		qos_subscribed[3];
+	int		vplmn_address_allowed;
+	uint8_t		apn[63];
+	size_t		apn_size;
+};
+
 enum sgsn_subscriber_proc {
 	SGSN_SUBSCR_PROC_NONE = 0,
 	SGSN_SUBSCR_PROC_PURGE,
@@ -282,6 +298,7 @@ struct sgsn_subscriber_data {
 	struct sgsn_mm_ctx	*mm;
 	struct gsm_auth_tuple	auth_triplets[5];
 	int			auth_triplets_updated;
+	struct llist_head	pdp_list;
 	int			error_cause;
 	struct osmo_timer_list	timer;
 	int			retries;
diff --git a/openbsc/src/gprs/gprs_subscriber.c b/openbsc/src/gprs/gprs_subscriber.c
index 5bde6a090..25785d451 100644
--- a/openbsc/src/gprs/gprs_subscriber.c
+++ b/openbsc/src/gprs/gprs_subscriber.c
@@ -172,9 +172,23 @@ static struct sgsn_subscriber_data *sgsn_subscriber_data_alloc(void *ctx)
 	for (idx = 0; idx < ARRAY_SIZE(sdata->auth_triplets); idx++)
 	     sdata->auth_triplets[idx].key_seq = GSM_KEY_SEQ_INVAL;
 
+	INIT_LLIST_HEAD(&sdata->pdp_list);
+
 	return sdata;
 }
 
+struct sgsn_subscriber_pdp_data* sgsn_subscriber_pdp_data_alloc(
+	struct sgsn_subscriber_data *sdata)
+{
+	struct sgsn_subscriber_pdp_data* pdata;
+
+	pdata = talloc_zero(sdata, struct sgsn_subscriber_pdp_data);
+
+	llist_add(&sdata->pdp_list, &pdata->list);
+
+	return pdata;
+}
+
 struct gsm_subscriber *gprs_subscr_get_or_create(const char *imsi)
 {
 	struct gsm_subscriber *subscr;