linux/net/lapb/lapb_subr.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	LAPB release 002
 *
 *	This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *	History
 *	LAPB 001	Jonathan Naylor	Started Coding
 */

#define pr_fmt(fmt) …

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>

/*
 *	This routine purges all the queues of frames.
 */
void lapb_clear_queues(struct lapb_cb *lapb)
{ … }

/*
 * This routine purges the input queue of those frames that have been
 * acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
 * SDL diagram.
 */
void lapb_frames_acked(struct lapb_cb *lapb, unsigned short nr)
{ … }

void lapb_requeue_frames(struct lapb_cb *lapb)
{ … }

/*
 *	Validate that the value of nr is between va and vs. Return true or
 *	false for testing.
 */
int lapb_validate_nr(struct lapb_cb *lapb, unsigned short nr)
{ … }

/*
 *	This routine is the centralised routine for parsing the control
 *	information for the different frame formats.
 */
int lapb_decode(struct lapb_cb *lapb, struct sk_buff *skb,
		struct lapb_frame *frame)
{ … }

/*
 *	This routine is called when the HDLC layer internally  generates a
 *	command or  response  for  the remote machine ( eg. RR, UA etc. ).
 *	Only supervisory or unnumbered frames are processed, FRMRs are handled
 *	by lapb_transmit_frmr below.
 */
void lapb_send_control(struct lapb_cb *lapb, int frametype,
		       int poll_bit, int type)
{ … }

/*
 *	This routine generates FRMRs based on information previously stored in
 *	the LAPB control block.
 */
void lapb_transmit_frmr(struct lapb_cb *lapb)
{ … }