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diff --git a/include/osmocom/gprs/gprs_bssgp.h b/include/osmocom/gprs/gprs_bssgp.h
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+++ b/include/osmocom/gprs/gprs_bssgp.h
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+#ifndef _GPRS_BSSGP_H
+#define _GPRS_BSSGP_H
+
+#include <stdint.h>
+
+#include <osmocom/gsm/gsm48.h>
+#include <osmocom/gsm/prim.h>
+
+#include <osmocom/gprs/protocol/gsm_08_18.h>
+
+/* gprs_bssgp_util.c */
+extern struct gprs_ns_inst *bssgp_nsi;
+struct msgb *bssgp_msgb_alloc(void);
+const char *bssgp_cause_str(enum gprs_bssgp_cause cause);
+/* Transmit a simple response such as BLOCK/UNBLOCK/RESET ACK/NACK */
+int bssgp_tx_simple_bvci(uint8_t pdu_type, uint16_t nsei,
+ uint16_t bvci, uint16_t ns_bvci);
+/* Chapter 10.4.14: Status */
+int bssgp_tx_status(uint8_t cause, uint16_t *bvci, struct msgb *orig_msg);
+
+enum bssgp_prim {
+ PRIM_BSSGP_DL_UD,
+ PRIM_BSSGP_UL_UD,
+ PRIM_BSSGP_PTM_UD,
+
+ PRIM_BSSGP_GMM_SUSPEND,
+ PRIM_BSSGP_GMM_RESUME,
+ PRIM_BSSGP_GMM_PAGING,
+
+ PRIM_NM_FLUSH_LL,
+ PRIM_NM_LLC_DISCARDED,
+ PRIM_NM_BVC_RESET,
+ PRIM_NM_BVC_BLOCK,
+ PRIM_NM_BVC_UNBLOCK,
+};
+
+struct osmo_bssgp_prim {
+ struct osmo_prim_hdr oph;
+
+ /* common fields */
+ uint16_t nsei;
+ uint16_t bvci;
+ uint32_t tlli;
+ struct tlv_parsed *tp;
+ struct gprs_ra_id *ra_id;
+
+ /* specific fields */
+ union {
+ struct {
+ uint8_t *suspend_ref;
+ } resume;
+ } u;
+};
+
+/* gprs_bssgp.c */
+
+#define BVC_S_BLOCKED 0x0001
+
+/* The per-BTS context that we keep on the SGSN side of the BSSGP link */
+struct bssgp_bvc_ctx {
+ struct llist_head list;
+
+ struct gprs_ra_id ra_id; /*!< parsed RA ID of the remote BTS */
+ uint16_t cell_id; /*!< Cell ID of the remote BTS */
+
+ /* NSEI and BVCI of underlying Gb link. Together they
+ * uniquely identify a link to a BTS (5.4.4) */
+ uint16_t bvci;
+ uint16_t nsei;
+
+ uint32_t state;
+
+ struct rate_ctr_group *ctrg;
+
+ /* we might want to add this as a shortcut later, avoiding the NSVC
+ * lookup for every packet, similar to a routing cache */
+ //struct gprs_nsvc *nsvc;
+};
+extern struct llist_head bssgp_bvc_ctxts;
+/* Find a BTS Context based on parsed RA ID and Cell ID */
+struct bssgp_bvc_ctx *btsctx_by_raid_cid(const struct gprs_ra_id *raid, uint16_t cid);
+/* Find a BTS context based on BVCI+NSEI tuple */
+struct bssgp_bvc_ctx *btsctx_by_bvci_nsei(uint16_t bvci, uint16_t nsei);
+
+#define BVC_F_BLOCKED 0x0001
+
+enum bssgp_ctr {
+ BSSGP_CTR_PKTS_IN,
+ BSSGP_CTR_PKTS_OUT,
+ BSSGP_CTR_BYTES_IN,
+ BSSGP_CTR_BYTES_OUT,
+ BSSGP_CTR_BLOCKED,
+ BSSGP_CTR_DISCARDED,
+};
+
+
+#include <osmocom/gsm/tlv.h>
+#include <osmocom/gprs/gprs_msgb.h>
+
+/* BSSGP-UL-UNITDATA.ind */
+int bssgp_rcvmsg(struct msgb *msg);
+
+/* BSSGP-DL-UNITDATA.req */
+struct bssgp_lv {
+ uint16_t len;
+ uint8_t *v;
+};
+/* parameters for BSSGP downlink userdata transmission */
+struct bssgp_dl_ud_par {
+ uint32_t *tlli;
+ char *imsi;
+ uint16_t drx_parms;
+ /* FIXME: priority */
+ struct bssgp_lv ms_ra_cap;
+ uint8_t qos_profile[3];
+};
+int bssgp_tx_dl_ud(struct msgb *msg, uint16_t pdu_lifetime,
+ struct bssgp_dl_ud_par *dup);
+
+uint16_t bssgp_parse_cell_id(struct gprs_ra_id *raid, const uint8_t *buf);
+int bssgp_create_cell_id(uint8_t *buf, const struct gprs_ra_id *raid,
+ uint16_t cid);
+
+/* Wrapper around TLV parser to parse BSSGP IEs */
+static inline int bssgp_tlv_parse(struct tlv_parsed *tp, uint8_t *buf, int len)
+{
+ return tlv_parse(tp, &tvlv_att_def, buf, len, 0, 0);
+}
+
+/*! \brief BSSGP Paging mode */
+enum bssgp_paging_mode {
+ BSSGP_PAGING_PS,
+ BSSGP_PAGING_CS,
+};
+
+/*! \brief BSSGP Paging scope */
+enum bssgp_paging_scope {
+ BSSGP_PAGING_BSS_AREA, /*!< all cells in BSS */
+ BSSGP_PAGING_LOCATION_AREA, /*!< all cells in LA */
+ BSSGP_PAGING_ROUTEING_AREA, /*!< all cells in RA */
+ BSSGP_PAGING_BVCI, /*!< one cell */
+};
+
+/*! \brief BSSGP paging information */
+struct bssgp_paging_info {
+ enum bssgp_paging_mode mode; /*!< CS or PS paging */
+ enum bssgp_paging_scope scope; /*!< bssgp_paging_scope */
+ struct gprs_ra_id raid; /*!< RA Identifier */
+ uint16_t bvci; /*!< BVCI */
+ char *imsi; /*!< IMSI, if any */
+ uint32_t *ptmsi; /*!< P-TMSI, if any */
+ uint16_t drx_params; /*!< DRX parameters */
+ uint8_t qos[3]; /*!< QoS parameters */
+};
+
+/* Send a single GMM-PAGING.req to a given NSEI/NS-BVCI */
+int bssgp_tx_paging(uint16_t nsei, uint16_t ns_bvci,
+ struct bssgp_paging_info *pinfo);
+
+/* gprs_bssgp_vty.c */
+int bssgp_vty_init(void);
+void bssgp_set_log_ss(int ss);
+
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx);
+
+#endif /* _GPRS_BSSGP_H */