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diff --git a/include/osmocom/gprs/protocol/gsm_08_16.h b/include/osmocom/gprs/protocol/gsm_08_16.h
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+++ b/include/osmocom/gprs/protocol/gsm_08_16.h
@@ -0,0 +1,85 @@
+#ifndef _OSMO_08_16_H
+#define _OSMO_08_16_H
+
+/* GPRS Networks Service (NS) messages on the Gb interface
+ * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05)
+ * 3GPP TS 48.016 version 6.5.0 Release 6 / ETSI TS 148 016 V6.5.0 (2005-11) */
+
+#include <stdint.h>
+
+/*! \addtogroup libgb
+ * @{
+ */
+
+/*! \file gprs_ns.h */
+
+/*! \brief Common header of GPRS NS */
+struct gprs_ns_hdr {
+ uint8_t pdu_type; /*!< NS PDU type */
+ uint8_t data[0]; /*!< variable-length payload */
+} __attribute__((packed));
+
+/*! \brief NS PDU Type (TS 08.16, Section 10.3.7, Table 14) */
+enum ns_pdu_type {
+ NS_PDUT_UNITDATA = 0x00,
+ NS_PDUT_RESET = 0x02,
+ NS_PDUT_RESET_ACK = 0x03,
+ NS_PDUT_BLOCK = 0x04,
+ NS_PDUT_BLOCK_ACK = 0x05,
+ NS_PDUT_UNBLOCK = 0x06,
+ NS_PDUT_UNBLOCK_ACK = 0x07,
+ NS_PDUT_STATUS = 0x08,
+ NS_PDUT_ALIVE = 0x0a,
+ NS_PDUT_ALIVE_ACK = 0x0b,
+ /* TS 48.016 Section 10.3.7, Table 10.3.7.1 */
+ SNS_PDUT_ACK = 0x0c,
+ SNS_PDUT_ADD = 0x0d,
+ SNS_PDUT_CHANGE_WEIGHT = 0x0e,
+ SNS_PDUT_CONFIG = 0x0f,
+ SNS_PDUT_CONFIG_ACK = 0x10,
+ SNS_PDUT_DELETE = 0x11,
+ SNS_PDUT_SIZE = 0x12,
+ SNS_PDUT_SIZE_ACK = 0x13,
+};
+
+/*! \brief NS Control IE (TS 08.16, Section 10.3, Table 12) */
+enum ns_ctrl_ie {
+ NS_IE_CAUSE = 0x00,
+ NS_IE_VCI = 0x01,
+ NS_IE_PDU = 0x02,
+ NS_IE_BVCI = 0x03,
+ NS_IE_NSEI = 0x04,
+ /* TS 48.016 Section 10.3, Table 10.3.1 */
+ NS_IE_IPv4_LIST = 0x05,
+ NS_IE_IPv6_LIST = 0x06,
+ NS_IE_MAX_NR_NSVC = 0x07,
+ NS_IE_IPv4_EP_NR = 0x08,
+ NS_IE_IPv6_EP_NR = 0x09,
+ NS_IE_RESET_FLAG = 0x0a,
+ NS_IE_IP_ADDR = 0x0b,
+};
+
+/*! \brief NS Cause (TS 08.16, Section 10.3.2, Table 13) */
+enum ns_cause {
+ NS_CAUSE_TRANSIT_FAIL = 0x00,
+ NS_CAUSE_OM_INTERVENTION = 0x01,
+ NS_CAUSE_EQUIP_FAIL = 0x02,
+ NS_CAUSE_NSVC_BLOCKED = 0x03,
+ NS_CAUSE_NSVC_UNKNOWN = 0x04,
+ NS_CAUSE_BVCI_UNKNOWN = 0x05,
+ NS_CAUSE_SEM_INCORR_PDU = 0x08,
+ NS_CAUSE_PDU_INCOMP_PSTATE = 0x0a,
+ NS_CAUSE_PROTO_ERR_UNSPEC = 0x0b,
+ NS_CAUSE_INVAL_ESSENT_IE = 0x0c,
+ NS_CAUSE_MISSING_ESSENT_IE = 0x0d,
+ /* TS 48.016 Section 10.3.2, Table 10.3.2.1 */
+ NS_CAUSE_INVAL_NR_IPv4_EP = 0x0e,
+ NS_CAUSE_INVAL_NR_IPv6_EP = 0x0f,
+ NS_CAUSE_INVAL_NR_NS_VC = 0x10,
+ NS_CAUSE_INVAL_WEIGH = 0x11,
+ NS_CAUSE_UNKN_IP_EP = 0x12,
+ NS_CAUSE_UNKN_IP_ADDR = 0x13,
+ NS_CAUSE_UNKN_IP_TEST_FAILED = 0x14,
+};
+
+#endif