lapdm.c File Reference
LAPDm implementation according to GSM TS 04.06
`#include <stdio.h>`
`#include <stdint.h>`
`#include <string.h>`
`#include <errno.h>`
`#include <arpa/inet.h>`
`#include <osmocom/core/logging.h>`
`#include <osmocom/core/timer.h>`
`#include <osmocom/core/msgb.h>`
`#include <osmocom/core/utils.h>`
`#include <osmocom/gsm/tlv.h>`
`#include <osmocom/gsm/rsl.h>`
`#include <osmocom/gsm/prim.h>`
`#include <osmocom/gsm/gsm_utils.h>`
`#include <osmocom/gsm/lapdm.h>`
`#include <osmocom/gsm/protocol/gsm_04_08.h>`
`#include <osmocom/gsm/protocol/gsm_08_58.h>`

## Macros

#define | LAPDm_LPD_NORMAL 0
#define | LAPDm_LPD_SMSCB 1
#define | LAPDm_SAPI_NORMAL 0
#define | LAPDm_SAPI_SMS 3
#define | LAPDm_ADDR(lpd, sapi, cr) ((((lpd) & 0x3) << 5) | (((sapi) & 0x7) << 2) | (((cr) & 0x1) << 1) | 0x1)
#define | LAPDm_ADDR_LPD(addr) (((addr) >> 5) & 0x3)
#define | LAPDm_ADDR_SAPI(addr) (((addr) >> 2) & 0x7)
#define | LAPDm_ADDR_CR(addr) (((addr) >> 1) & 0x1)
#define | LAPDm_ADDR_EA(addr) ((addr) & 0x1)
#define | LAPDm_CTRL_I(nr, ns, p) ((((nr) & 0x7) << 5) | (((p) & 0x1) << 4) | (((ns) & 0x7) << 1))
#define | LAPDm_CTRL_S(nr, s, p) ((((nr) & 0x7) << 5) | (((p) & 0x1) << 4) | (((s) & 0x3) << 2) | 0x1)
#define | LAPDm_CTRL_U(u, p) ((((u) & 0x1c) << (5-2)) | (((p) & 0x1) << 4) | (((u) & 0x3) << 2) | 0x3)
#define | LAPDm_CTRL_is_I(ctrl) (((ctrl) & 0x1) == 0)
#define | LAPDm_CTRL_is_S(ctrl) (((ctrl) & 0x3) == 1)
#define | LAPDm_CTRL_is_U(ctrl) (((ctrl) & 0x3) == 3)
#define | LAPDm_CTRL_U_BITS(ctrl) ((((ctrl) & 0xC) >> 2) | ((ctrl) & 0xE0) >> 3)
#define | LAPDm_CTRL_PF_BIT(ctrl) (((ctrl) >> 4) & 0x1)
#define | LAPDm_CTRL_S_BITS(ctrl) (((ctrl) & 0xC) >> 2)
#define | LAPDm_CTRL_I_Ns(ctrl) (((ctrl) & 0xE) >> 1)
#define | LAPDm_CTRL_Nr(ctrl) (((ctrl) & 0xE0) >> 5)
#define | LAPDm_LEN(len) ((len << 2) | 0x1)
#define | LAPDm_MORE 0x2
#define | LAPDm_EL 0x1
#define | LAPDm_U_UI 0x0
#define | N201_AB_SACCH 18
#define | N201_AB_SDCCH 20
#define | N201_AB_FACCH 20
#define | N201_Bbis 23
#define | N201_Bter_SACCH 21
#define | N201_Bter_SDCCH 23
#define | N201_Bter_FACCH 23
#define | N201_B4 19
#define | N200_EST_REL 5
#define | N200_TR_SACCH 5
#define | N200_TR_SDCCH 23
#define | N200_TR_FACCH_FR 34
#define | N200_TR_EFACCH_FR 48
#define | N200_TR_FACCH_HR 29
#define | N200 N200_TR_SDCCH

## Enumerations

enum | lapdm_format { LAPDm_FMT_A, LAPDm_FMT_B, LAPDm_FMT_Bbis, LAPDm_FMT_Bter, LAPDm_FMT_B4 }

## Functions

static int | lapdm_send_ph_data_req (struct lapd_msg_ctx *lctx, struct msgb *msg)
static int | send_rslms_dlsap (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static int | update_pending_frames (struct lapd_msg_ctx *lctx)
static void | lapdm_dl_init (struct lapdm_datalink *dl, struct lapdm_entity *entity, int t200)
void | lapdm_entity_init (struct lapdm_entity *le, enum lapdm_mode mode, int t200)
| initialize a LAPDm entity and all datalinks inside More...
void | lapdm_channel_init (struct lapdm_channel *lc, enum lapdm_mode mode)
| initialize a LAPDm channel and all its channels More...
void | lapdm_entity_exit (struct lapdm_entity *le)
| flush and release all resoures in LAPDm entity
void | lapdm_channel_exit (struct lapdm_channel *lc)
struct lapdm_datalink * | lapdm_datalink_for_sapi (struct lapdm_entity *le, uint8_t sapi)
static void | lapdm_pad_msgb (struct msgb *msg, uint8_t n201)
static int | rslms_sendmsg (struct msgb *msg, struct lapdm_entity *le)
static int | tx_ph_data_enqueue (struct lapdm_datalink *dl, struct msgb *msg, uint8_t chan_nr, uint8_t link_id, uint8_t pad)
static struct msgb * | tx_dequeue_msgb (struct lapdm_entity *le)
int | lapdm_phsap_dequeue_prim (struct lapdm_entity *le, struct osmo_phsap_prim *pp)
| dequeue a msg that's pending transmission via L1 and wrap it into a osmo_phsap_prim
static int | l2_ph_data_conf (struct msgb *msg, struct lapdm_entity *le)
static int | send_rslms_rll_l3 (uint8_t msg_type, struct lapdm_msg_ctx *mctx, struct msgb *msg)
static int | send_rslms_rll_l3_ui (struct lapdm_msg_ctx *mctx, struct msgb *msg)
static int | send_rll_simple (uint8_t msg_type, struct lapdm_msg_ctx *mctx)
static int | rsl_rll_error (uint8_t cause, struct lapdm_msg_ctx *mctx)
static int | l2_ph_data_ind (struct msgb *msg, struct lapdm_entity *le, uint8_t chan_nr, uint8_t link_id)
static int | l2_ph_rach_ind (struct lapdm_entity *le, uint8_t ra, uint32_t fn, uint8_t acc_delay)
static int | l2_ph_chan_conf (struct msgb *msg, struct lapdm_entity *le, uint32_t frame_nr)
int | lapdm_phsap_up (struct osmo_prim_hdr *oph, struct lapdm_entity *le)
| Receive a PH-SAP primitive from L1.
static int | set_lapdm_context (struct lapdm_datalink *dl, uint8_t chan_nr, uint8_t link_id, int n201, uint8_t sapi)
static int | rslms_rx_rll_est_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_rll_udata_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_rll_data_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_rll_susp_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_rll_res_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_rll_rel_req (struct msgb *msg, struct lapdm_datalink *dl)
static int | rslms_rx_chan_rqd (struct lapdm_channel *lc, struct msgb *msg)
static int | rslms_rx_rll (struct msgb *msg, struct lapdm_channel *lc)
static int | rslms_rx_com_chan (struct msgb *msg, struct lapdm_channel *lc)
int | lapdm_rslms_recvmsg (struct msgb *msg, struct lapdm_channel *lc)
| Receive a RSLms msgb from Layer 3.
int | lapdm_entity_set_mode (struct lapdm_entity *le, enum lapdm_mode mode)
| Set the lapdm_mode of a LAPDm entity.
int | lapdm_channel_set_mode (struct lapdm_channel *lc, enum lapdm_mode mode)
| Set the lapdm_mode of a LAPDm channel.
void | lapdm_channel_set_l1 (struct lapdm_channel *lc, osmo_prim_cb cb, void *ctx)
| Set the L1 callback and context of a LAPDm channel.
void | lapdm_channel_set_l3 (struct lapdm_channel *lc, lapdm_cb_t cb, void *ctx)
| Set the L3 callback and context of a LAPDm channel.
void | lapdm_entity_reset (struct lapdm_entity *le)
| Reset an entire LAPDm entity and all its datalinks.
void | lapdm_channel_reset (struct lapdm_channel *lc)
| Reset a LAPDm channel with all its entities.
void | lapdm_entity_set_flags (struct lapdm_entity *le, unsigned int flags)
| Set the flags of a LAPDm entity.
void | lapdm_channel_set_flags (struct lapdm_channel *lc, unsigned int flags)
| Set the flags of all LAPDm entities in a LAPDm channel.