LAPD implementation common part

Osmocom LAPD core, used for Q.921, LAPDm and others. More...

Files
file	lapd_core.h
	primitive related stuff
file	lapd_core.c
	LAPD core implementation.

Data Structures
struct	mdl_error_ind_param
	for MDL-ERROR.ind More...
struct	dl_rel_req_param
	for DL-REL.req More...
struct	osmo_dlsap_prim
	primitive header for LAPD DL-SAP primitives More...
struct	lapd_msg_ctx
	LAPD message context. More...
struct	lapd_cr_ent
struct	lapd_history
struct	lapd_datalink
	LAPD datalink. More...
struct	l2downstate

Macros
#define	LOGDL(dl, level, fmt, args...)    LOGP(DLLAPD, level, "(%s) " fmt, (dl)->name, ## args)
#define	MDL_CAUSE_T200_EXPIRED   0x01
#define	MDL_CAUSE_REEST_REQ   0x02
#define	MDL_CAUSE_UNSOL_UA_RESP   0x03
#define	MDL_CAUSE_UNSOL_DM_RESP   0x04
#define	MDL_CAUSE_UNSOL_DM_RESP_MF   0x05
#define	MDL_CAUSE_UNSOL_SPRV_RESP   0x06
#define	MDL_CAUSE_SEQ_ERR   0x07
#define	MDL_CAUSE_UFRM_INC_PARAM   0x08
#define	MDL_CAUSE_SFRM_INC_PARAM   0x09
#define	MDL_CAUSE_IFRM_INC_MBITS   0x0a
#define	MDL_CAUSE_IFRM_INC_LEN   0x0b
#define	MDL_CAUSE_FRM_UNIMPL   0x0c
#define	MDL_CAUSE_SABM_MF   0x0d
#define	MDL_CAUSE_SABM_INFO_NOTALL   0x0e
#define	MDL_CAUSE_FRMR   0x0f
#define	LAPD_F_RTS   0x0001
	lapd_flags More...
#define	LAPD_F_DROP_2ND_REJ   0x0002
#define	LAPD_U_SABM   0x7
#define	LAPD_U_SABME   0xf
#define	LAPD_U_DM   0x3
#define	LAPD_U_UI   0x0
#define	LAPD_U_DISC   0x8
#define	LAPD_U_UA   0xC
#define	LAPD_U_FRMR   0x11
#define	LAPD_S_RR   0x0
#define	LAPD_S_RNR   0x1
#define	LAPD_S_REJ   0x2
#define	CR_USER2NET_CMD   0
#define	CR_USER2NET_RESP   1
#define	CR_NET2USER_CMD   1
#define	CR_NET2USER_RESP   0
#define	LAPD_HEADROOM   56
#define	LAPD_TAILROOM   16
#define	SBIT(a)   (1 << a)
#define	ALL_STATES   0xffffffff
#define	L2DOWNSLLEN    (sizeof(l2downstatelist) / sizeof(struct l2downstate))

Enumerations
enum	osmo_dl_prim {   PRIM_DL_UNIT_DATA ,   PRIM_DL_DATA ,   PRIM_DL_EST ,   PRIM_DL_REL ,   PRIM_DL_SUSP ,   PRIM_DL_RES ,   PRIM_DL_RECON ,   PRIM_MDL_ERROR }
	LAPD related primitives (L2<->L3 SAP) More...
enum	lapd_mode {   LAPD_MODE_USER ,   LAPD_MODE_NETWORK }
	LAPD mode/role. More...
enum	lapd_state {   LAPD_STATE_NULL = 0 ,   LAPD_STATE_TEI_UNASS ,   LAPD_STATE_ASS_TEI_WAIT ,   LAPD_STATE_EST_TEI_WAIT ,   LAPD_STATE_IDLE ,   LAPD_STATE_SABM_SENT ,   LAPD_STATE_DISC_SENT ,   LAPD_STATE_MF_EST ,   LAPD_STATE_TIMER_RECOV }
	LAPD state (Figure B.2/Q.921) More...
enum	lapd_t200_rts {   LAPD_T200_RTS_OFF = 0 ,   LAPD_T200_RTS_PENDING ,   LAPD_T200_RTS_RUNNING }
	LAPD T200 state in RTS mode. More...
enum	lapd_format {   LAPD_FORM_UKN = 0 ,   LAPD_FORM_I ,   LAPD_FORM_S ,   LAPD_FORM_U }
	LAPD message format (I / S / U) More...

Functions
void	lapd_dl_init (struct lapd_datalink *dl, uint8_t k, uint8_t v_range, int maxf)
	Initialize LAPD datalink instance and allocate history. More...
void	lapd_dl_init2 (struct lapd_datalink *dl, uint8_t k, uint8_t v_range, int maxf, const char *name)
	Initialize LAPD datalink instance and allocate history. More...
void	lapd_dl_set_name (struct lapd_datalink *dl, const char *name)
void	lapd_dl_exit (struct lapd_datalink *dl)
void	lapd_dl_reset (struct lapd_datalink *dl)
int	lapd_dl_set_flags (struct lapd_datalink *dl, unsigned int flags)
	Set lapd_flags to change behaviour. More...
int	lapd_set_mode (struct lapd_datalink *dl, enum lapd_mode mode)
	Set the lapdm_mode of a LAPDm entity. More...
int	lapd_ph_data_ind (struct msgb *msg, struct lapd_msg_ctx *lctx)
int	lapd_ph_rts_ind (struct lapd_msg_ctx *lctx)
	Enqueue next LAPD frame and run pending T200. More...
int	lapd_recv_dlsap (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
int	lapd_t200_timeout (struct lapd_datalink *dl)
	Handle timeout condition of T200 in RTS mode. More...
static void	lapd_t200_cb (void *data)
static void	lapd_t203_cb (void *data)
static int	lapd_send_i (struct lapd_datalink *dl, int line, bool rts)
static int	lapd_est_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
struct msgb *	lapd_msgb_alloc (int length, const char *name)
static uint8_t	do_mod (uint8_t x, uint8_t m)
static uint8_t	inc_mod (uint8_t x, uint8_t m)
static uint8_t	add_mod (uint8_t x, uint8_t y, uint8_t m)
static uint8_t	sub_mod (uint8_t x, uint8_t y, uint8_t m)
static void	lapd_dl_flush_send (struct lapd_datalink *dl)
static void	lapd_dl_flush_hist (struct lapd_datalink *dl)
static void	lapd_dl_flush_tx_queue (struct lapd_datalink *dl)
static void	lapd_dl_flush_tx (struct lapd_datalink *dl)
static const char *	lapd_state_name (enum lapd_state state)
static void	lapd_start_t200 (struct lapd_datalink *dl)
static void	lapd_start_t203 (struct lapd_datalink *dl)
static void	lapd_stop_t200 (struct lapd_datalink *dl)
static bool	lapd_is_t200_started (struct lapd_datalink *dl)
static void	lapd_stop_t203 (struct lapd_datalink *dl)
static void	lapd_dl_newstate (struct lapd_datalink *dl, uint32_t state)
static int	send_dl_l3 (uint8_t prim, uint8_t op, struct lapd_msg_ctx *lctx, struct msgb *msg)
static int	send_dl_simple (uint8_t prim, uint8_t op, struct lapd_msg_ctx *lctx)
static int	mdl_error (uint8_t cause, struct lapd_msg_ctx *lctx)
static int	lapd_send_ua (struct lapd_msg_ctx *lctx, uint8_t len, uint8_t *data)
static int	lapd_send_dm (struct lapd_msg_ctx *lctx)
static int	lapd_send_rr (struct lapd_msg_ctx *lctx, uint8_t f_bit, uint8_t cmd)
static int	lapd_send_rnr (struct lapd_msg_ctx *lctx, uint8_t f_bit, uint8_t cmd)
static int	lapd_send_rej (struct lapd_msg_ctx *lctx, uint8_t f_bit)
static int	lapd_send_resend (struct lapd_datalink *dl)
static int	lapd_reestablish (struct lapd_datalink *dl)
static int	lapd_acknowledge (struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_sabm (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_dm (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_ui (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_disc (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_ua (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u_frmr (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_u (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_s (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_rx_i (struct msgb *msg, struct lapd_msg_ctx *lctx)
static int	lapd_udata_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static void	msg_to_tx_hist (struct lapd_history *tx_hist, const struct msgb *msg, int length, int more)
static void	msg_to_tx_hist0 (struct lapd_datalink *dl, const struct msgb *msg)
static int	lapd_data_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static int	lapd_susp_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static int	lapd_res_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static int	lapd_rel_req (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)
static int	lapd_rel_req_idle (struct osmo_dlsap_prim *dp, struct lapd_msg_ctx *lctx)

Variables
const struct value_string	lapd_state_names []
void *	tall_lapd_ctx = NULL
static const struct l2downstate	l2downstatelist []

Detailed Description

Osmocom LAPD core, used for Q.921, LAPDm and others.

Notes on Buffering: rcv_buffer, tx_queue, tx_hist, send_buffer, send_queue

RX data is stored in the rcv_buffer (pointer). If the message is complete, it is removed from rcv_buffer pointer and forwarded to L3. If the RX data is received while there is an incomplete rcv_buffer, it is appended to it.

TX data is stored in the send_queue first. When transmitting a frame, the first message in the send_queue is moved to the send_buffer. There it resides until all fragments are acknowledged. Fragments to be sent by I frames are stored in the tx_hist buffer for resend, if required. Also the current fragment is copied into the tx_queue. There it resides until it is forwarded to layer 1.

In case we have SAPI 0, we only have a window size of 1, so the unack- nowledged message resides always in the send_buffer. In case of a suspend, it can be written back to the first position of the send_queue.

The layer 1 normally sends a PH-READY-TO-SEND. But because we use asynchronous transfer between layer 1 and layer 2 (serial link), we must send a frame before layer 1 reaches the right timeslot to send it. So we move the tx_queue to layer 1 when there is not already a pending frame, and wait until acknowledge after the frame has been sent. If we receive an acknowledge, we can send the next frame from the buffer, if any.

The moving of tx_queue to layer 1 may also trigger T200, if desired. Also it will trigger next I frame, if possible.

T203 is optional. It will be stated when entering MF EST state. It will also be started when I or S frame is received in that state . It will be restarted in the lapd_acknowledge() function, in case outstanding frames will not trigger T200. It will be stoped, when T200 is started in MF EST state. It will also be stoped when leaving MF EST state.

Macro Definition Documentation

ALL_STATES

#define ALL_STATES   0xffffffff

CR_NET2USER_CMD

#define CR_NET2USER_CMD   1

CR_NET2USER_RESP

#define CR_NET2USER_RESP   0

CR_USER2NET_CMD

#define CR_USER2NET_CMD   0

CR_USER2NET_RESP

#define CR_USER2NET_RESP   1

L2DOWNSLLEN

#define L2DOWNSLLEN    (sizeof(l2downstatelist) / sizeof(struct l2downstate))

LAPD_F_DROP_2ND_REJ

#define LAPD_F_DROP_2ND_REJ   0x0002

LAPD_F_RTS

#define LAPD_F_RTS   0x0001

lapd_flags

LAPD_HEADROOM

#define LAPD_HEADROOM   56

LAPD_S_REJ

#define LAPD_S_REJ   0x2

LAPD_S_RNR

#define LAPD_S_RNR   0x1

LAPD_S_RR

#define LAPD_S_RR   0x0

LAPD_TAILROOM

#define LAPD_TAILROOM   16

LAPD_U_DISC

#define LAPD_U_DISC   0x8

LAPD_U_DM

#define LAPD_U_DM   0x3

LAPD_U_FRMR

#define LAPD_U_FRMR   0x11

LAPD_U_SABM

#define LAPD_U_SABM   0x7

LAPD_U_SABME

#define LAPD_U_SABME   0xf

LAPD_U_UA

#define LAPD_U_UA   0xC

LAPD_U_UI

#define LAPD_U_UI   0x0

LOGDL

#define LOGDL	(		dl,
			level,
			fmt,
			args...
	)		LOGP(DLLAPD, level, "(%s) " fmt, (dl)->name, ## args)

MDL_CAUSE_FRM_UNIMPL

#define MDL_CAUSE_FRM_UNIMPL   0x0c

MDL_CAUSE_FRMR

#define MDL_CAUSE_FRMR   0x0f

MDL_CAUSE_IFRM_INC_LEN

#define MDL_CAUSE_IFRM_INC_LEN   0x0b

MDL_CAUSE_IFRM_INC_MBITS

#define MDL_CAUSE_IFRM_INC_MBITS   0x0a

MDL_CAUSE_REEST_REQ

#define MDL_CAUSE_REEST_REQ   0x02

MDL_CAUSE_SABM_INFO_NOTALL

#define MDL_CAUSE_SABM_INFO_NOTALL   0x0e

MDL_CAUSE_SABM_MF

#define MDL_CAUSE_SABM_MF   0x0d

MDL_CAUSE_SEQ_ERR

#define MDL_CAUSE_SEQ_ERR   0x07

MDL_CAUSE_SFRM_INC_PARAM

#define MDL_CAUSE_SFRM_INC_PARAM   0x09

MDL_CAUSE_T200_EXPIRED

#define MDL_CAUSE_T200_EXPIRED   0x01

MDL_CAUSE_UFRM_INC_PARAM

#define MDL_CAUSE_UFRM_INC_PARAM   0x08

MDL_CAUSE_UNSOL_DM_RESP

#define MDL_CAUSE_UNSOL_DM_RESP   0x04

MDL_CAUSE_UNSOL_DM_RESP_MF

#define MDL_CAUSE_UNSOL_DM_RESP_MF   0x05

MDL_CAUSE_UNSOL_SPRV_RESP

#define MDL_CAUSE_UNSOL_SPRV_RESP   0x06

MDL_CAUSE_UNSOL_UA_RESP

#define MDL_CAUSE_UNSOL_UA_RESP   0x03

SBIT

#define SBIT

(

a

)

(1 << a)

Enumeration Type Documentation

lapd_format

enum lapd_format

LAPD message format (I / S / U)

Enumerator
LAPD_FORM_UKN
LAPD_FORM_I
LAPD_FORM_S
LAPD_FORM_U

lapd_mode

enum lapd_mode

LAPD mode/role.

Enumerator
LAPD_MODE_USER	behave like user
LAPD_MODE_NETWORK	behave like network

lapd_state

enum lapd_state

LAPD state (Figure B.2/Q.921)

Enumerator
LAPD_STATE_NULL
LAPD_STATE_TEI_UNASS
LAPD_STATE_ASS_TEI_WAIT
LAPD_STATE_EST_TEI_WAIT
LAPD_STATE_IDLE
LAPD_STATE_SABM_SENT
LAPD_STATE_DISC_SENT
LAPD_STATE_MF_EST
LAPD_STATE_TIMER_RECOV

lapd_t200_rts

enum lapd_t200_rts

LAPD T200 state in RTS mode.

Enumerator
LAPD_T200_RTS_OFF
LAPD_T200_RTS_PENDING
LAPD_T200_RTS_RUNNING

osmo_dl_prim

enum osmo_dl_prim

LAPD related primitives (L2<->L3 SAP)

Enumerator
PRIM_DL_UNIT_DATA	DL-UNIT-DATA.
PRIM_DL_DATA	DL-DATA.
PRIM_DL_EST	DL-ESTABLISH.
PRIM_DL_REL	DL-RLEEASE.
PRIM_DL_SUSP	DL-SUSPEND.
PRIM_DL_RES	DL-RESUME.
PRIM_DL_RECON	DL-RECONNECT.
PRIM_MDL_ERROR	MDL-ERROR.

Function Documentation

add_mod()

static uint8_t add_mod ( uint8_t  x, uint8_t  y, uint8_t  m  )

inlinestatic

References x.

Referenced by lapd_send_i().

do_mod()

static uint8_t do_mod ( uint8_t  x, uint8_t  m  )

inlinestatic

References x.

Referenced by lapd_acknowledge(), lapd_send_i(), lapd_send_resend(), and lapd_t200_cb().

inc_mod()

static uint8_t inc_mod ( uint8_t  x, uint8_t  m  )

inlinestatic

References x.

Referenced by lapd_acknowledge(), lapd_rx_i(), and lapd_send_i().

lapd_acknowledge()

static int lapd_acknowledge ( struct lapd_msg_ctx *  lctx )

static

References lapd_msg_ctx::dl, do_mod(), lapd_msg_ctx::format, inc_mod(), LAPD_FORM_S, lapd_is_t200_started(), LAPD_S_REJ, lapd_start_t200(), lapd_start_t203(), LAPD_STATE_MF_EST, LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_stop_t203(), lapd_datalink::lctx, LOGDL, LOGL_INFO, LOGL_NOTICE, MDL_CAUSE_SEQ_ERR, lapd_history::msg, msgb_free(), lapd_msg_ctx::n_recv, lapd_datalink::range_hist, lapd_msg_ctx::s_u, lapd_datalink::state, sub_mod(), lapd_datalink::t203_sec, lapd_datalink::t203_usec, lapd_datalink::tx_hist, lapd_datalink::v_ack, lapd_datalink::v_range, and lapd_datalink::v_send.

Referenced by lapd_rx_i(), and lapd_rx_s().

lapd_data_req()

static int lapd_data_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::dl, lapd_send_i(), lapd_datalink::lctx, LOGDL, LOGL_ERROR, LOGL_INFO, osmo_prim_hdr::msg, msgb_enqueue(), msgb_free(), msgb_l3len(), osmo_dlsap_prim::oph, and lapd_datalink::send_queue.

lapd_dl_exit()

void lapd_dl_exit

(

struct lapd_datalink *

dl

)

References lapd_dl_newstate(), lapd_dl_reset(), LAPD_STATE_NULL, lapd_datalink::name, and lapd_datalink::tx_hist.

lapd_dl_flush_hist()

static void lapd_dl_flush_hist ( struct lapd_datalink *  dl )

static

References lapd_history::msg, msgb_free(), lapd_datalink::range_hist, and lapd_datalink::tx_hist.

Referenced by lapd_dl_flush_tx(), lapd_est_req(), lapd_rel_req(), lapd_res_req(), lapd_rx_u_sabm(), and lapd_rx_u_ua().

lapd_dl_flush_send()

static void lapd_dl_flush_send ( struct lapd_datalink *  dl )

static

References msgb_dequeue(), msgb_free(), lapd_datalink::send_buffer, and lapd_datalink::send_queue.

Referenced by lapd_dl_reset(), lapd_est_req(), lapd_rel_req(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_ua(), and lapd_t200_cb().

lapd_dl_flush_tx()

static void lapd_dl_flush_tx ( struct lapd_datalink *  dl )

static

References lapd_dl_flush_hist(), and lapd_dl_flush_tx_queue().

Referenced by lapd_dl_reset(), lapd_rel_req(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_ua(), lapd_susp_req(), and lapd_t200_cb().

lapd_dl_flush_tx_queue()

static void lapd_dl_flush_tx_queue ( struct lapd_datalink *  dl )

static

References msgb_dequeue(), msgb_free(), and lapd_datalink::tx_queue.

Referenced by lapd_dl_flush_tx(), and lapd_rx_s().

lapd_dl_init()

void lapd_dl_init	(	struct lapd_datalink *	dl,
		uint8_t	k,
		uint8_t	v_range,
		int	maxf
	)

Initialize LAPD datalink instance and allocate history.

Parameters

[in]	dl	caller-allocated datalink structure
[in]	k	maximum number of unacknowledged frames
[in]	v_range	range of sequence numbers
[in]	maxf	maximum frame size (after defragmentation)

References lapd_dl_init2().

lapd_dl_init2()

void lapd_dl_init2	(	struct lapd_datalink *	dl,
		uint8_t	k,
		uint8_t	v_range,
		int	maxf,
		const char *	name
	)

Initialize LAPD datalink instance and allocate history.

Parameters

[in]	dl	caller-allocated datalink structure
[in]	k	maximum number of unacknowledged frames
[in]	v_range	range of sequence numbers
[in]	maxf	maximum frame size (after defragmentation)
[in]	name	human-readable name for this LAPD datalink

References INIT_LLIST_HEAD, lapd_datalink::k, lapd_dl_newstate(), LAPD_STATE_IDLE, lapd_t200_cb(), lapd_t203_cb(), LOGDL, LOGL_INFO, lapd_datalink::maxf, lapd_datalink::n200, lapd_datalink::n200_est_rel, name, lapd_datalink::name, OSMO_ASSERT, osmo_timer_setup(), lapd_datalink::range_hist, lapd_datalink::reestablish, lapd_datalink::send_queue, lapd_datalink::t200, lapd_datalink::t200_sec, lapd_datalink::t200_usec, lapd_datalink::t203, lapd_datalink::t203_sec, lapd_datalink::t203_usec, tall_lapd_ctx, lapd_datalink::tx_hist, lapd_datalink::tx_queue, and lapd_datalink::v_range.

Referenced by lapd_dl_init().

lapd_dl_newstate()

static void lapd_dl_newstate ( struct lapd_datalink *  dl, uint32_t  state  )

static

References lapd_datalink::cont_res, lapd_start_t203(), LAPD_STATE_MF_EST, lapd_state_name(), lapd_stop_t203(), LOGDL, LOGL_INFO, msgb_free(), lapd_datalink::state, lapd_datalink::t203_sec, and lapd_datalink::t203_usec.

Referenced by lapd_dl_exit(), lapd_dl_init2(), lapd_dl_reset(), lapd_est_req(), lapd_rel_req(), lapd_res_req(), lapd_rx_s(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_sabm(), lapd_rx_u_ua(), lapd_t200_cb(), and lapd_t203_cb().

lapd_dl_reset()

void lapd_dl_reset

(

struct lapd_datalink *

dl

)

References lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), LAPD_STATE_IDLE, lapd_stop_t200(), lapd_stop_t203(), LOGDL, LOGL_INFO, msgb_free(), lapd_datalink::rcv_buffer, and lapd_datalink::state.

Referenced by lapd_dl_exit().

lapd_dl_set_flags()

int lapd_dl_set_flags	(	struct lapd_datalink *	dl,
		unsigned int	flags
	)

Set lapd_flags to change behaviour.

Parameters

[in]	dl	lapd_datalink instance
[in]	flags	lapd_flags

References flags, LAPD_F_RTS, lapd_datalink::lapd_flags, lapd_is_t200_started(), LOGDL, and LOGL_ERROR.

lapd_dl_set_name()

void lapd_dl_set_name	(	struct lapd_datalink *	dl,
		const char *	name
	)

References name, lapd_datalink::name, osmo_talloc_replace_string(), and tall_lapd_ctx.

lapd_est_req()

static int lapd_est_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, lapd_dl_flush_hist(), lapd_dl_flush_send(), lapd_dl_newstate(), LAPD_FORM_U, lapd_start_t200(), LAPD_STATE_SABM_SENT, LAPD_U_SABM, LAPD_U_SABME, lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, lapd_datalink::loc2rem, LOGDL, LOGL_INFO, lapd_msg_ctx::more, osmo_prim_hdr::msg, msg_to_tx_hist0(), msgb_free(), osmo_dlsap_prim::oph, lapd_datalink::own_busy, lapd_msg_ctx::p_f, lapd_datalink::peer_busy, lapd_datalink::rcv_buffer, lapd_datalink::retrans_ctr, lapd_msg_ctx::s_u, lapd_datalink::send_ph_data_req, lapd_datalink::use_sabme, and lapd_datalink::v_send.

Referenced by lapd_reestablish().

lapd_is_t200_started()

static bool lapd_is_t200_started ( struct lapd_datalink *  dl )

static

References LAPD_F_RTS, lapd_datalink::lapd_flags, LAPD_T200_RTS_OFF, osmo_timer_pending(), lapd_datalink::t200, and lapd_datalink::t200_rts.

Referenced by lapd_acknowledge(), lapd_dl_set_flags(), and lapd_send_i().

lapd_msgb_alloc()

struct msgb * lapd_msgb_alloc	(	int	length,
		const char *	name
	)

References LAPD_HEADROOM, LAPD_TAILROOM, msgb_alloc_headroom(), and name.

Referenced by lapd_reestablish(), lapd_res_req(), lapd_rx_i(), lapd_rx_u_sabm(), lapd_send_dm(), lapd_send_i(), lapd_send_rej(), lapd_send_resend(), lapd_send_rnr(), lapd_send_rr(), lapd_send_ua(), lapd_t200_cb(), and msg_to_tx_hist().

lapd_ph_data_ind()

int lapd_ph_data_ind	(	struct msgb *	msg,
		struct lapd_msg_ctx *	lctx
	)

References lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_I, LAPD_FORM_S, LAPD_FORM_U, lapd_rx_i(), lapd_rx_s(), lapd_rx_u(), lapd_datalink::lctx, LOGDL, LOGL_NOTICE, and msgb_free().

lapd_ph_rts_ind()

int lapd_ph_rts_ind

(

struct lapd_msg_ctx *

lctx

)

Enqueue next LAPD frame and run pending T200.

(Must be called when frame is ready to send.) The caller (LAPDm code) calls this function before it sends the next frame. If there is no frame in the TX queue, LAPD will enqueue next I-frame, if possible. If the T200 is pending, it is changed to running state.

Parameters

[in]	lctx	LAPD context
[out]	rc	set to 1, if timer T200 state changed to running, set to 0, if not.

References lapd_msg_ctx::dl, lapd_send_i(), LAPD_STATE_MF_EST, LAPD_STATE_TIMER_RECOV, LAPD_T200_RTS_PENDING, LAPD_T200_RTS_RUNNING, lapd_datalink::lctx, llist_empty(), lapd_datalink::state, lapd_datalink::t200_rts, and lapd_datalink::tx_queue.

lapd_recv_dlsap()

int lapd_recv_dlsap	(	struct osmo_dlsap_prim *	dp,
		struct lapd_msg_ctx *	lctx
	)

References lapd_msg_ctx::dl, L2DOWNSLLEN, l2downstatelist, lapd_state_name(), lapd_datalink::lctx, LOGDL, LOGL_INFO, LOGL_NOTICE, osmo_prim_hdr::msg, msgb_free(), name, l2downstate::op, osmo_prim_hdr::operation, osmo_dlsap_prim::oph, l2downstate::prim, osmo_prim_hdr::primitive, l2downstate::rout, SBIT, lapd_datalink::state, and l2downstate::states.

lapd_reestablish()

static int lapd_reestablish ( struct lapd_datalink *  dl )

static

References lapd_est_req(), lapd_msgb_alloc(), lapd_datalink::lctx, LOGDL, LOGL_DEBUG, osmo_dlsap_prim::oph, osmo_prim_init(), PRIM_DL_EST, and PRIM_OP_REQUEST.

Referenced by lapd_rx_u_dm(), lapd_rx_u_frmr(), and lapd_t200_cb().

lapd_rel_req()

static int lapd_rel_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, lapd_dl_flush_hist(), lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), LAPD_FORM_U, lapd_start_t200(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, lapd_stop_t200(), LAPD_U_DISC, lapd_datalink::lctx, lapd_msg_ctx::length, lapd_datalink::loc2rem, LOGDL, LOGL_INFO, dl_rel_req_param::mode, lapd_msg_ctx::more, osmo_prim_hdr::msg, msg_to_tx_hist0(), msgb_free(), osmo_dlsap_prim::oph, lapd_datalink::own_busy, lapd_msg_ctx::p_f, lapd_datalink::peer_busy, PRIM_DL_REL, PRIM_OP_CONFIRM, osmo_dlsap_prim::rel_req, lapd_datalink::retrans_ctr, lapd_msg_ctx::s_u, send_dl_simple(), lapd_datalink::send_ph_data_req, lapd_datalink::state, osmo_dlsap_prim::u, and lapd_datalink::v_send.

lapd_rel_req_idle()

static int lapd_rel_req_idle ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::dl, lapd_datalink::lctx, osmo_prim_hdr::msg, msgb_free(), osmo_dlsap_prim::oph, PRIM_DL_REL, PRIM_OP_CONFIRM, and send_dl_simple().

lapd_res_req()

static int lapd_res_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, lapd_msg_ctx::format, msgb::l3h, lapd_dl_flush_hist(), lapd_dl_newstate(), LAPD_FORM_U, lapd_msgb_alloc(), lapd_start_t200(), LAPD_STATE_SABM_SENT, LAPD_U_SABM, LAPD_U_SABME, lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, lapd_datalink::loc2rem, LOGDL, LOGL_INFO, lapd_msg_ctx::more, osmo_prim_hdr::msg, msg_to_tx_hist0(), msgb_free(), osmo_dlsap_prim::oph, lapd_datalink::own_busy, lapd_msg_ctx::p_f, lapd_datalink::peer_busy, lapd_datalink::rcv_buffer, lapd_datalink::retrans_ctr, lapd_msg_ctx::s_u, lapd_datalink::send_buffer, lapd_datalink::send_out, lapd_datalink::send_ph_data_req, lapd_datalink::use_sabme, and lapd_datalink::v_send.

lapd_rx_i()

static int lapd_rx_i ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, inc_mod(), msgb::l3h, lapd_acknowledge(), LAPD_F_DROP_2ND_REJ, lapd_datalink::lapd_flags, lapd_msgb_alloc(), lapd_send_dm(), lapd_send_i(), lapd_send_rej(), lapd_send_rnr(), lapd_send_rr(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, lapd_state_name(), LAPD_STATE_NULL, LAPD_STATE_SABM_SENT, lapd_datalink::lctx, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, LOGL_NOTICE, lapd_datalink::maxf, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_IFRM_INC_LEN, MDL_CAUSE_IFRM_INC_MBITS, mdl_error(), lapd_msg_ctx::more, msgb_free(), msgb_l3len(), msgb_put(), msgb_trim(), lapd_msg_ctx::n201, lapd_msg_ctx::n_send, lapd_datalink::own_busy, lapd_msg_ctx::p_f, PRIM_DL_DATA, PRIM_OP_INDICATION, lapd_datalink::rcv_buffer, lapd_datalink::rem2loc, lapd_cr_ent::resp, lapd_msg_ctx::sapi, send_dl_l3(), lapd_datalink::seq_err_cond, lapd_datalink::state, lapd_datalink::update_pending_frames, lapd_datalink::v_range, and lapd_datalink::v_recv.

Referenced by lapd_ph_data_ind().

lapd_rx_s()

static int lapd_rx_s ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_acknowledge(), lapd_dl_flush_tx_queue(), lapd_dl_newstate(), LAPD_S_REJ, LAPD_S_RNR, LAPD_S_RR, lapd_send_dm(), lapd_send_i(), lapd_send_rnr(), lapd_send_rr(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_SABM_SENT, LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_datalink::lctx, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, LOGL_NOTICE, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_SFRM_INC_PARAM, MDL_CAUSE_UNSOL_SPRV_RESP, mdl_error(), lapd_msg_ctx::more, msgb_free(), lapd_msg_ctx::n_recv, lapd_datalink::own_busy, lapd_msg_ctx::p_f, lapd_datalink::peer_busy, lapd_datalink::rem2loc, lapd_cr_ent::resp, lapd_msg_ctx::s_u, lapd_datalink::seq_err_cond, lapd_datalink::state, lapd_datalink::v_ack, and lapd_datalink::v_send.

Referenced by lapd_ph_data_ind().

lapd_rx_u()

static int lapd_rx_u ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::dl, lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_frmr(), lapd_rx_u_sabm(), lapd_rx_u_ua(), lapd_rx_u_ui(), LAPD_U_DISC, LAPD_U_DM, LAPD_U_FRMR, LAPD_U_SABM, LAPD_U_SABME, LAPD_U_UA, LAPD_U_UI, lapd_datalink::lctx, LOGDL, LOGL_NOTICE, MDL_CAUSE_FRM_UNIMPL, mdl_error(), msgb_free(), and lapd_msg_ctx::s_u.

Referenced by lapd_ph_data_ind().

lapd_rx_u_disc()

static int lapd_rx_u_disc ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, msgb::l3h, lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), lapd_send_dm(), lapd_send_ua(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_SABM_SENT, LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_datalink::lctx, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_UFRM_INC_PARAM, mdl_error(), lapd_msg_ctx::more, msgb_free(), PRIM_DL_REL, PRIM_OP_CONFIRM, PRIM_OP_INDICATION, lapd_datalink::rem2loc, lapd_cr_ent::resp, send_dl_simple(), lapd_datalink::seq_err_cond, and lapd_datalink::state.

Referenced by lapd_rx_u().

lapd_rx_u_dm()

static int lapd_rx_u_dm ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), lapd_reestablish(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_SABM_SENT, LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_datalink::lctx, LOGDL, LOGL_ERROR, LOGL_INFO, LOGL_NOTICE, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_UNSOL_DM_RESP, MDL_CAUSE_UNSOL_DM_RESP_MF, mdl_error(), msgb_free(), lapd_msg_ctx::p_f, PRIM_DL_REL, PRIM_OP_CONFIRM, PRIM_OP_INDICATION, lapd_datalink::reestablish, lapd_datalink::rem2loc, send_dl_simple(), and lapd_datalink::state.

Referenced by lapd_rx_u().

lapd_rx_u_frmr()

static int lapd_rx_u_frmr ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::dl, lapd_reestablish(), lapd_datalink::lctx, LOGDL, LOGL_NOTICE, MDL_CAUSE_FRMR, mdl_error(), msgb_free(), and lapd_datalink::reestablish.

Referenced by lapd_rx_u().

lapd_rx_u_sabm()

static int lapd_rx_u_sabm ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_datalink::cont_res, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, msgb::l3h, lapd_dl_flush_hist(), lapd_dl_newstate(), LAPD_MODE_NETWORK, lapd_msgb_alloc(), lapd_send_dm(), lapd_send_ua(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, LOGL_NOTICE, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_SABM_INFO_NOTALL, MDL_CAUSE_SABM_MF, MDL_CAUSE_UFRM_INC_PARAM, mdl_error(), lapd_datalink::mode, lapd_msg_ctx::more, lapd_history::msg, msgb_free(), msgb_put(), msgb_trim(), lapd_msg_ctx::n201, PRIM_DL_EST, PRIM_OP_INDICATION, lapd_datalink::rem2loc, lapd_cr_ent::resp, send_dl_l3(), send_dl_simple(), lapd_datalink::seq_err_cond, lapd_datalink::state, lapd_datalink::tx_hist, lapd_datalink::v_ack, lapd_datalink::v_recv, and lapd_datalink::v_send.

Referenced by lapd_rx_u().

lapd_rx_u_ua()

static int lapd_rx_u_ua ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, msgb::l3h, lapd_dl_flush_hist(), lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), lapd_send_i(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_SABM_SENT, LAPD_STATE_TIMER_RECOV, lapd_stop_t200(), lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_UFRM_INC_PARAM, MDL_CAUSE_UNSOL_UA_RESP, mdl_error(), lapd_msg_ctx::more, lapd_history::msg, msgb_free(), lapd_msg_ctx::n201, lapd_msg_ctx::p_f, PRIM_DL_EST, PRIM_DL_REL, PRIM_OP_CONFIRM, PRIM_OP_INDICATION, lapd_datalink::rem2loc, send_dl_simple(), lapd_datalink::state, lapd_datalink::tx_hist, lapd_datalink::v_ack, lapd_datalink::v_recv, and lapd_datalink::v_send.

Referenced by lapd_rx_u().

lapd_rx_u_ui()

static int lapd_rx_u_ui ( struct msgb *  msg, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_datalink::lctx, lapd_msg_ctx::length, LOGDL, LOGL_ERROR, LOGL_INFO, MDL_CAUSE_FRM_UNIMPL, MDL_CAUSE_UFRM_INC_PARAM, mdl_error(), lapd_msg_ctx::more, msgb_free(), msgb_trim(), lapd_msg_ctx::n201, PRIM_DL_UNIT_DATA, PRIM_OP_INDICATION, lapd_datalink::rem2loc, lapd_cr_ent::resp, and send_dl_l3().

Referenced by lapd_rx_u().

lapd_send_dm()

static int lapd_send_dm ( struct lapd_msg_ctx *  lctx )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_U, lapd_msgb_alloc(), LAPD_U_DM, lapd_datalink::lctx, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, lapd_cr_ent::resp, lapd_msg_ctx::s_u, and lapd_datalink::send_ph_data_req.

Referenced by lapd_rx_i(), lapd_rx_s(), lapd_rx_u_disc(), and lapd_rx_u_sabm().

lapd_send_i()

static int lapd_send_i ( struct lapd_datalink *  dl, int  line, bool  rts  )

static

References add_mod(), lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, do_mod(), lapd_msg_ctx::format, inc_mod(), lapd_datalink::k, msgb::l3h, LAPD_F_RTS, lapd_datalink::lapd_flags, LAPD_FORM_I, lapd_is_t200_started(), lapd_msgb_alloc(), lapd_start_t200(), LAPD_STATE_TIMER_RECOV, lapd_stop_t203(), lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, llist_empty(), lapd_datalink::loc2rem, LOGDL, LOGL_INFO, lapd_msg_ctx::more, lapd_history::more, lapd_history::msg, msg_to_tx_hist(), msgb_dequeue(), msgb_free(), msgb_l3len(), msgb_put(), lapd_msg_ctx::n201, lapd_msg_ctx::n_recv, lapd_msg_ctx::n_send, lapd_msg_ctx::p_f, lapd_datalink::peer_busy, lapd_datalink::range_hist, lapd_datalink::send_buffer, lapd_datalink::send_out, lapd_datalink::send_ph_data_req, lapd_datalink::send_queue, lapd_datalink::state, lapd_datalink::tx_hist, lapd_datalink::tx_queue, lapd_datalink::v_ack, lapd_datalink::v_range, lapd_datalink::v_recv, and lapd_datalink::v_send.

Referenced by lapd_data_req(), lapd_ph_rts_ind(), lapd_rx_i(), lapd_rx_s(), and lapd_rx_u_ua().

lapd_send_rej()

static int lapd_send_rej ( struct lapd_msg_ctx *  lctx, uint8_t  f_bit  )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_S, lapd_msgb_alloc(), LAPD_S_REJ, lapd_datalink::lctx, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, lapd_msg_ctx::n_recv, lapd_msg_ctx::p_f, lapd_cr_ent::resp, lapd_msg_ctx::s_u, lapd_datalink::send_ph_data_req, and lapd_datalink::v_recv.

Referenced by lapd_rx_i().

lapd_send_resend()

static int lapd_send_resend ( struct lapd_datalink *  dl )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, lapd_msg_ctx::dl, do_mod(), lapd_msg_ctx::format, msgb::l3h, LAPD_FORM_U, lapd_msgb_alloc(), LAPD_STATE_SABM_SENT, LAPD_U_DISC, LAPD_U_SABM, LAPD_U_SABME, lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, lapd_history::msg, msgb_put(), lapd_msg_ctx::p_f, lapd_datalink::range_hist, lapd_msg_ctx::s_u, lapd_datalink::send_ph_data_req, lapd_datalink::state, lapd_datalink::tx_hist, lapd_datalink::use_sabme, and lapd_datalink::v_send.

Referenced by lapd_t200_cb().

lapd_send_rnr()

static int lapd_send_rnr ( struct lapd_msg_ctx *  lctx, uint8_t  f_bit, uint8_t  cmd  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_S, lapd_msgb_alloc(), LAPD_S_RNR, lapd_datalink::lctx, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, lapd_msg_ctx::n_recv, lapd_msg_ctx::p_f, lapd_cr_ent::resp, lapd_msg_ctx::s_u, lapd_datalink::send_ph_data_req, and lapd_datalink::v_recv.

Referenced by lapd_rx_i(), lapd_rx_s(), lapd_t200_cb(), and lapd_t203_cb().

lapd_send_rr()

static int lapd_send_rr ( struct lapd_msg_ctx *  lctx, uint8_t  f_bit, uint8_t  cmd  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_S, lapd_msgb_alloc(), LAPD_S_RR, lapd_datalink::lctx, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, lapd_msg_ctx::n_recv, lapd_msg_ctx::p_f, lapd_cr_ent::resp, lapd_msg_ctx::s_u, lapd_datalink::send_ph_data_req, and lapd_datalink::v_recv.

Referenced by lapd_rx_i(), lapd_rx_s(), lapd_t200_cb(), and lapd_t203_cb().

lapd_send_ua()

static int lapd_send_ua ( struct lapd_msg_ctx *  lctx, uint8_t  len, uint8_t *  data  )

static

References lapd_msg_ctx::cr, lapd_datalink::cr, data, lapd_msg_ctx::dl, lapd_msg_ctx::format, msgb::l3h, LAPD_FORM_U, lapd_msgb_alloc(), LAPD_U_UA, lapd_datalink::lctx, len(), lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, msgb_put(), lapd_cr_ent::resp, lapd_msg_ctx::s_u, and lapd_datalink::send_ph_data_req.

Referenced by lapd_rx_u_disc(), and lapd_rx_u_sabm().

lapd_set_mode()

int lapd_set_mode	(	struct lapd_datalink *	dl,
		enum lapd_mode	mode
	)

Set the lapdm_mode of a LAPDm entity.

References lapd_cr_ent::cmd, lapd_datalink::cr, CR_NET2USER_CMD, CR_NET2USER_RESP, CR_USER2NET_CMD, CR_USER2NET_RESP, LAPD_MODE_NETWORK, LAPD_MODE_USER, lapd_datalink::loc2rem, lapd_datalink::mode, lapd_datalink::rem2loc, and lapd_cr_ent::resp.

lapd_start_t200()

static void lapd_start_t200 ( struct lapd_datalink *  dl )

static

References LAPD_F_RTS, lapd_datalink::lapd_flags, LAPD_T200_RTS_OFF, LAPD_T200_RTS_PENDING, LOGDL, LOGL_INFO, osmo_timer_pending(), osmo_timer_schedule(), lapd_datalink::t200, lapd_datalink::t200_rts, lapd_datalink::t200_sec, and lapd_datalink::t200_usec.

Referenced by lapd_acknowledge(), lapd_est_req(), lapd_rel_req(), lapd_res_req(), lapd_send_i(), lapd_t200_cb(), and lapd_t203_cb().

lapd_start_t203()

static void lapd_start_t203 ( struct lapd_datalink *  dl )

static

References LOGDL, LOGL_INFO, osmo_timer_pending(), osmo_timer_schedule(), lapd_datalink::t203, lapd_datalink::t203_sec, and lapd_datalink::t203_usec.

Referenced by lapd_acknowledge(), and lapd_dl_newstate().

lapd_state_name()

static const char * lapd_state_name ( enum lapd_state  state )

inlinestatic

References get_value_string(), and lapd_state_names.

Referenced by lapd_dl_newstate(), lapd_recv_dlsap(), lapd_rx_i(), lapd_rx_s(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_sabm(), lapd_rx_u_ua(), lapd_t200_cb(), lapd_t203_cb(), and mdl_error().

lapd_stop_t200()

static void lapd_stop_t200 ( struct lapd_datalink *  dl )

static

References LAPD_F_RTS, lapd_datalink::lapd_flags, LAPD_T200_RTS_OFF, LOGDL, LOGL_INFO, osmo_timer_del(), osmo_timer_pending(), lapd_datalink::t200, and lapd_datalink::t200_rts.

Referenced by lapd_acknowledge(), lapd_dl_reset(), lapd_rel_req(), lapd_rx_s(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_sabm(), lapd_rx_u_ua(), and lapd_susp_req().

lapd_stop_t203()

static void lapd_stop_t203 ( struct lapd_datalink *  dl )

static

References LOGDL, LOGL_INFO, osmo_timer_del(), osmo_timer_pending(), and lapd_datalink::t203.

Referenced by lapd_acknowledge(), lapd_dl_newstate(), lapd_dl_reset(), lapd_send_i(), and lapd_susp_req().

lapd_susp_req()

static int lapd_susp_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_msg_ctx::dl, lapd_dl_flush_tx(), lapd_stop_t200(), lapd_stop_t203(), lapd_datalink::lctx, msgb::list, llist_add(), LOGDL, LOGL_INFO, osmo_prim_hdr::msg, msgb_free(), osmo_dlsap_prim::oph, PRIM_DL_SUSP, PRIM_OP_CONFIRM, lapd_datalink::send_buffer, send_dl_simple(), and lapd_datalink::send_queue.

lapd_t200_cb()

static void lapd_t200_cb ( void *  data )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, msgb::data, data, lapd_msg_ctx::dl, do_mod(), lapd_msg_ctx::format, msgb::l3h, lapd_dl_flush_send(), lapd_dl_flush_tx(), lapd_dl_newstate(), LAPD_FORM_I, lapd_msgb_alloc(), lapd_reestablish(), lapd_send_resend(), lapd_send_rnr(), lapd_send_rr(), lapd_start_t200(), LAPD_STATE_DISC_SENT, LAPD_STATE_IDLE, LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_SABM_SENT, LAPD_STATE_TIMER_RECOV, lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, lapd_datalink::loc2rem, LOGDL, LOGL_INFO, LOGL_NOTICE, MDL_CAUSE_T200_EXPIRED, mdl_error(), lapd_msg_ctx::more, lapd_history::more, lapd_history::msg, msgb_put(), lapd_datalink::n200, lapd_datalink::n200_est_rel, lapd_msg_ctx::n_recv, lapd_msg_ctx::n_send, lapd_datalink::own_busy, lapd_msg_ctx::p_f, PRIM_DL_REL, PRIM_OP_CONFIRM, PRIM_OP_INDICATION, lapd_datalink::range_hist, lapd_datalink::reestablish, lapd_datalink::retrans_ctr, send_dl_simple(), lapd_datalink::send_ph_data_req, lapd_datalink::seq_err_cond, lapd_datalink::state, sub_mod(), lapd_datalink::tx_hist, lapd_datalink::v_range, lapd_datalink::v_recv, and lapd_datalink::v_send.

Referenced by lapd_dl_init2(), and lapd_t200_timeout().

lapd_t200_timeout()

int lapd_t200_timeout

(

struct lapd_datalink *

dl

)

Handle timeout condition of T200 in RTS mode.

The caller (LAPDm code) implements the T200 timer and must detect timeout condition. The function gets called by LAPDm code when it detects a timeout of T200.

Parameters

[in]

dl

caller-allocated datalink structure

References LAPD_F_RTS, lapd_datalink::lapd_flags, lapd_t200_cb(), LAPD_T200_RTS_OFF, LAPD_T200_RTS_RUNNING, OSMO_ASSERT, and lapd_datalink::t200_rts.

lapd_t203_cb()

static void lapd_t203_cb ( void *  data )

static

References data, lapd_dl_newstate(), lapd_send_rnr(), lapd_send_rr(), lapd_start_t200(), LAPD_STATE_MF_EST, lapd_state_name(), LAPD_STATE_TIMER_RECOV, lapd_datalink::lctx, LOGDL, LOGL_ERROR, LOGL_INFO, lapd_datalink::own_busy, lapd_datalink::retrans_ctr, and lapd_datalink::state.

Referenced by lapd_dl_init2().

lapd_udata_req()

static int lapd_udata_req ( struct osmo_dlsap_prim *  dp, struct lapd_msg_ctx *  lctx  )

static

References lapd_cr_ent::cmd, lapd_msg_ctx::cr, lapd_datalink::cr, lapd_msg_ctx::dl, lapd_msg_ctx::format, LAPD_FORM_U, LAPD_U_UI, lapd_datalink::lctx, msgb::len, lapd_msg_ctx::length, lapd_datalink::loc2rem, lapd_msg_ctx::more, osmo_prim_hdr::msg, osmo_dlsap_prim::oph, lapd_msg_ctx::s_u, and lapd_datalink::send_ph_data_req.

mdl_error()

static int mdl_error ( uint8_t  cause, struct lapd_msg_ctx *  lctx  )

static

References mdl_error_ind_param::cause, lapd_msg_ctx::dl, osmo_dlsap_prim::error_ind, lapd_state_name(), lapd_datalink::lctx, LOGDL, LOGL_NOTICE, osmo_dlsap_prim::oph, osmo_prim_init(), PRIM_MDL_ERROR, PRIM_OP_INDICATION, lapd_datalink::send_dlsap, lapd_datalink::state, and osmo_dlsap_prim::u.

Referenced by lapd_rx_i(), lapd_rx_s(), lapd_rx_u(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_frmr(), lapd_rx_u_sabm(), lapd_rx_u_ua(), lapd_rx_u_ui(), and lapd_t200_cb().

msg_to_tx_hist()

static void msg_to_tx_hist ( struct lapd_history *  tx_hist, const struct msgb *  msg, int  length, int  more  )

static

References msgb::data, msgb::l3h, lapd_msgb_alloc(), msgb::len, lapd_msg_ctx::length, lapd_msg_ctx::more, lapd_history::more, lapd_history::msg, and msgb_put().

Referenced by lapd_send_i(), and msg_to_tx_hist0().

msg_to_tx_hist0()

static void msg_to_tx_hist0 ( struct lapd_datalink *  dl, const struct msgb *  msg  )

static

References lapd_msg_ctx::dl, msgb::len, msg_to_tx_hist(), and lapd_datalink::tx_hist.

Referenced by lapd_est_req(), lapd_rel_req(), and lapd_res_req().

send_dl_l3()

static int send_dl_l3 ( uint8_t  prim, uint8_t  op, struct lapd_msg_ctx *  lctx, struct msgb *  msg  )

static

References lapd_msg_ctx::dl, lapd_datalink::lctx, osmo_dlsap_prim::oph, osmo_prim_init(), and lapd_datalink::send_dlsap.

Referenced by lapd_rx_i(), lapd_rx_u_sabm(), lapd_rx_u_ui(), and send_dl_simple().

send_dl_simple()

static int send_dl_simple ( uint8_t  prim, uint8_t  op, struct lapd_msg_ctx *  lctx  )

inlinestatic

References send_dl_l3().

Referenced by lapd_rel_req(), lapd_rel_req_idle(), lapd_rx_u_disc(), lapd_rx_u_dm(), lapd_rx_u_sabm(), lapd_rx_u_ua(), lapd_susp_req(), and lapd_t200_cb().

sub_mod()

static uint8_t sub_mod ( uint8_t  x, uint8_t  y, uint8_t  m  )

inlinestatic

References x.

Referenced by lapd_acknowledge(), and lapd_t200_cb().

Variable Documentation

l2downstatelist

const struct l2downstate l2downstatelist[]

static

Referenced by lapd_recv_dlsap().

lapd_state_names

const struct value_string lapd_state_names[]

Initial value:

= {
        OSMO_VALUE_STRING(LAPD_STATE_NULL),
        OSMO_VALUE_STRING(LAPD_STATE_TEI_UNASS),
        OSMO_VALUE_STRING(LAPD_STATE_ASS_TEI_WAIT),
        OSMO_VALUE_STRING(LAPD_STATE_EST_TEI_WAIT),
        OSMO_VALUE_STRING(LAPD_STATE_IDLE),
        OSMO_VALUE_STRING(LAPD_STATE_SABM_SENT),
        OSMO_VALUE_STRING(LAPD_STATE_DISC_SENT),
        OSMO_VALUE_STRING(LAPD_STATE_MF_EST),
        OSMO_VALUE_STRING(LAPD_STATE_TIMER_RECOV),
        { 0, NULL }
}

Referenced by lapd_state_name().

tall_lapd_ctx

void* tall_lapd_ctx = NULL

Referenced by lapd_dl_init2(), and lapd_dl_set_name().