1 files changed, 189 insertions, 0 deletions
diff --git a/include/osmocom/gprs/gprs_ns.h b/include/osmocom/gprs/gprs_ns.h
new file mode 100644
index 00000000..a7f32b25
--- /dev/null
+++ b/include/osmocom/gprs/gprs_ns.h
@@ -0,0 +1,189 @@
+#ifndef _GPRS_NS_H
+#define _GPRS_NS_H
+
+#include <stdint.h>
+
+/* Our Implementation */
+#include <netinet/in.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/timer.h>
+#include <osmocom/core/select.h>
+#include <osmocom/gprs/gprs_msgb.h>
+
+#include <osmocom/gprs/protocol/gsm_08_16.h>
+
+#define NS_TIMERS_COUNT 7
+#define NS_TIMERS "(tns-block|tns-block-retries|tns-reset|tns-reset-retries|tns-test|tns-alive|tns-alive-retries)"
+#define NS_TIMERS_HELP	\
+	"(un)blocking Timer (Tns-block) timeout\n"		\
+	"(un)blocking Timer (Tns-block) number of retries\n"	\
+	"Reset Timer (Tns-reset) timeout\n"			\
+	"Reset Timer (Tns-reset) number of retries\n"		\
+	"Test Timer (Tns-test) timeout\n"			\
+	"Alive Timer (Tns-alive) timeout\n"			\
+	"Alive Timer (Tns-alive) number of retries\n"
+
+enum ns_timeout {
+	NS_TOUT_TNS_BLOCK,
+	NS_TOUT_TNS_BLOCK_RETRIES,
+	NS_TOUT_TNS_RESET,
+	NS_TOUT_TNS_RESET_RETRIES,
+	NS_TOUT_TNS_TEST,
+	NS_TOUT_TNS_ALIVE,
+	NS_TOUT_TNS_ALIVE_RETRIES,
+};
+
+#define NSE_S_BLOCKED	0x0001
+#define NSE_S_ALIVE	0x0002
+
+/*! \brief Osmocom NS link layer types */
+enum gprs_ns_ll {
+	GPRS_NS_LL_UDP,		/*!< NS/UDP/IP */
+	GPRS_NS_LL_E1,		/*!< NS/E1 */
+	GPRS_NS_LL_FR_GRE,	/*!< NS/FR/GRE/IP */
+};
+
+/*! \brief Osmoco NS events */
+enum gprs_ns_evt {
+	GPRS_NS_EVT_UNIT_DATA,
+};
+
+struct gprs_nsvc;
+/*! \brief Osmocom GPRS callback function type */
+typedef int gprs_ns_cb_t(enum gprs_ns_evt event, struct gprs_nsvc *nsvc,
+			 struct msgb *msg, uint16_t bvci);
+
+/*! \brief An instance of the NS protocol stack */
+struct gprs_ns_inst {
+	/*! \brief callback to the user for incoming UNIT DATA IND */
+	gprs_ns_cb_t *cb;
+
+	/*! \brief linked lists of all NSVC in this instance */
+	struct llist_head gprs_nsvcs;
+
+	/*! \brief a NSVC object that's needed to deal with packets for
+	 * 	   unknown NSVC */
+	struct gprs_nsvc *unknown_nsvc;
+
+	uint16_t timeout[NS_TIMERS_COUNT];
+
+	/*! \brief NS-over-IP specific bits */
+	struct {
+		struct osmo_fd fd;
+		uint32_t local_ip;
+		uint16_t local_port;
+	} nsip;
+	/*! \brief NS-over-FR-over-GRE-over-IP specific bits */
+	struct {
+		struct osmo_fd fd;
+		uint32_t local_ip;
+		unsigned int enabled:1;
+	} frgre;
+};
+
+enum nsvc_timer_mode {
+	/* standard timers */
+	NSVC_TIMER_TNS_TEST,
+	NSVC_TIMER_TNS_ALIVE,
+	NSVC_TIMER_TNS_RESET,
+	_NSVC_TIMER_NR,
+};
+
+/*! \brief Structure representing a single NS-VC */
+struct gprs_nsvc {
+	/*! \brief list of NS-VCs within NS Instance */
+	struct llist_head list;
+	/*! \brief pointer to NS Instance */
+	struct gprs_ns_inst *nsi;
+
+	uint16_t nsei;	/*! \brief end-to-end significance */
+	uint16_t nsvci;	/*! \brief uniquely identifies NS-VC at SGSN */
+
+	uint32_t state;
+	uint32_t remote_state;
+
+	struct osmo_timer_list timer;
+	enum nsvc_timer_mode timer_mode;
+	int alive_retries;
+
+	unsigned int remote_end_is_sgsn:1;
+	unsigned int persistent:1;
+
+	struct rate_ctr_group *ctrg;
+
+	/*! \brief which link-layer are we based on? */
+	enum gprs_ns_ll ll;
+
+	union {
+		struct {
+			struct sockaddr_in bts_addr;
+		} ip;
+		struct {
+			struct sockaddr_in bts_addr;
+		} frgre;
+	};
+};
+
+/* Create a new NS protocol instance */
+struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb, void *ctx);
+
+/* Destroy a NS protocol instance */
+void gprs_ns_destroy(struct gprs_ns_inst *nsi);
+
+/* Listen for incoming GPRS packets via NS/UDP */
+int gprs_ns_nsip_listen(struct gprs_ns_inst *nsi);
+
+/* Establish a connection (from the BSS) to the SGSN */
+struct gprs_nsvc *gprs_ns_nsip_connect(struct gprs_ns_inst *nsi,
+					struct sockaddr_in *dest,
+					uint16_t nsei, uint16_t nsvci);
+
+
+struct sockaddr_in;
+
+/* main function for higher layers (BSSGP) to send NS messages */
+int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg);
+
+int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause);
+int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause);
+int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc);
+
+/* Listen for incoming GPRS packets via NS/FR/GRE */
+int gprs_ns_frgre_listen(struct gprs_ns_inst *nsi);
+
+struct gprs_nsvc *gprs_nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci);
+void gprs_nsvc_delete(struct gprs_nsvc *nsvc);
+struct gprs_nsvc *gprs_nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei);
+struct gprs_nsvc *gprs_nsvc_by_nsvci(struct gprs_ns_inst *nsi, uint16_t nsvci);
+
+/* Initiate a RESET procedure (including timer start, ...)*/
+void gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause);
+
+/* Add NS-specific VTY stuff */
+int gprs_ns_vty_init(struct gprs_ns_inst *nsi);
+
+#define NS_ALLOC_SIZE	2048
+#define NS_ALLOC_HEADROOM 20
+static inline struct msgb *gprs_ns_msgb_alloc(void)
+{
+	return msgb_alloc_headroom(NS_ALLOC_SIZE, NS_ALLOC_HEADROOM, "GPRS/NS");
+}
+
+enum signal_ns {
+	S_NS_RESET,
+	S_NS_BLOCK,
+	S_NS_UNBLOCK,
+	S_NS_ALIVE_EXP,	/* Tns-alive expired more than N times */
+};
+
+struct ns_signal_data {
+	struct gprs_nsvc *nsvc;
+	uint8_t cause;
+};
+
+void gprs_ns_set_log_ss(int ss);
+
+/*! }@ */
+
+#endif