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/*! \file gprs_bssgp.h */
#pragma once
#include <stdint.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/linuxlist.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);
struct msgb *bssgp_msgb_copy(const struct msgb *msg, const char *name);
const char *bssgp_cause_str(enum gprs_bssgp_cause cause);
const char *bssgp_pdu_str(enum bssgp_pdu_type pdu);
/* 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,
PRIM_NM_STATUS,
};
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 */
/*! BSSGP flow control (SGSN side) According to Section 8.2 */
struct bssgp_flow_control {
uint32_t bucket_size_max; /*!< maximum size of the bucket (octets) */
uint32_t bucket_leak_rate; /*!< leak rate of the bucket (octets/sec) */
uint32_t bucket_counter; /*!< number of tokens in the bucket */
struct timeval time_last_pdu; /*!< timestamp of last PDU sent */
/* the built-in queue */
uint32_t max_queue_depth; /*!< how many packets to queue (mgs) */
uint32_t queue_depth; /*!< current length of queue (msgs) */
struct llist_head queue; /*!< linked list of msgb's */
struct osmo_timer_list timer; /*!< timer-based dequeueing */
/*! callback to be called at output of flow control */
int (*out_cb)(struct bssgp_flow_control *fc, struct msgb *msg,
uint32_t llc_pdu_len, void *priv);
};
#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;
struct bssgp_flow_control *fc;
/*! default maximum size of per-MS bucket in octets */
uint32_t bmax_default_ms;
/*! default bucket leak rate of per-MS bucket in octests/s */
uint32_t r_default_ms;
/* 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,
BSSGP_CTR_STATUS,
};
#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;
struct bssgp_flow_control *fc;
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);
}
/*! BSSGP Paging mode */
enum bssgp_paging_mode {
BSSGP_PAGING_PS,
BSSGP_PAGING_CS,
};
/*! 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 */
};
/*! 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);
void bssgp_fc_init(struct bssgp_flow_control *fc,
uint32_t bucket_size_max, uint32_t bucket_leak_rate,
uint32_t max_queue_depth,
int (*out_cb)(struct bssgp_flow_control *fc, struct msgb *msg,
uint32_t llc_pdu_len, void *priv));
/* input function of the flow control implementation, called first
* for the MM flow control, and then as the MM flow control output
* callback in order to perform BVC flow control */
int bssgp_fc_in(struct bssgp_flow_control *fc, struct msgb *msg,
uint32_t llc_pdu_len, void *priv);
/* Initialize the Flow Control parameters for a new MS according to
* default values for the BVC specified by BVCI and NSEI */
int bssgp_fc_ms_init(struct bssgp_flow_control *fc_ms, uint16_t bvci,
uint16_t nsei, uint32_t max_queue_depth);
void bssgp_flush_all_queues();
void bssgp_fc_flush_queue(struct bssgp_flow_control *fc);
/* 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);
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