gprs_ns: Add code for SNS-SIZE and SNS-CONFIG encoding

Modern NS specifications contain a SNS (Sub Network Service) for
negotiating IP/port/weight parameters of NS-over-IP links dynamically.

This patch adds message encoding routines for SNS-CONFIG, SNS-SIZE
and their respective acknowledgements.

Related: OS#3372
Change-Id: I5c47e1c3c10deb89a7470ee2c03adfc174accc93

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gb/gb_internal.h b/src/gb/gb_internal.h
new file mode 100644
index 00000000..c1fa8e19
--- /dev/null
+++ b/src/gb/gb_internal.h
@@ -0,0 +1,19 @@
+#pragma once
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/gsm/tlv.h>
+#include <osmocom/gprs/gprs_ns.h>
+
+int gprs_ns_tx_sns_ack(struct gprs_nsvc *nsvc, uint8_t trans_id, uint8_t *cause,
+		       const struct gprs_ns_ie_ip4_elem *ip4_elems,unsigned int num_ip4_elems);
+
+int gprs_ns_tx_sns_config(struct gprs_nsvc *nsvc, bool end_flag,
+			  const struct gprs_ns_ie_ip4_elem *ip4_elems,
+			  unsigned int num_ip4_elems);
+
+int gprs_ns_tx_sns_config_ack(struct gprs_nsvc *nsvc, uint8_t *cause);
+
+int gprs_ns_tx_sns_size(struct gprs_nsvc *nsvc, bool reset_flag, uint16_t max_nr_nsvc,
+			uint16_t *ip4_ep_nr, uint16_t *ip6_ep_nr);
+
+int gprs_ns_tx_sns_size_ack(struct gprs_nsvc *nsvc, uint8_t *cause);