linux-imx

/*

 *  LAPB release 002

 *

 *  This code REQUIRES 2.1.15 or higher/ NET3.038

 *

 *  This module:

 *      This module is free software; you can redistribute it and/or

 *      modify it under the terms of the GNU General Public License

 *      as published by the Free Software Foundation; either version

 *      2 of the License, or (at your option) any later version.

 *

 *  History

 *  LAPB 001    Jonathan Naulor Started Coding

 *  LAPB 002    Jonathan Naylor New timer architecture.

 *  2000-10-29  Henner Eisen    lapb_data_indication() return status.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " 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/netdevice.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>

​

/*

 *  State machine for state 0, Disconnected State.

 *  The handling of the timer(s) is in file lapb_timer.c.

 */

static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb,

                struct lapb_frame *frame)

{

    switch (frame->type) {

    case LAPB_SABM:

        lapb_dbg(1, "(%p) S0 RX SABM(%d)\n", lapb->dev, frame->pf);

        if (lapb->mode & LAPB_EXTENDED) {

            lapb_dbg(1, "(%p) S0 TX DM(%d)\n",

                 lapb->dev, frame->pf);

            lapb_send_control(lapb, LAPB_DM, frame->pf,

                      LAPB_RESPONSE);

        } else {

            lapb_dbg(1, "(%p) S0 TX UA(%d)\n",

                 lapb->dev, frame->pf);

            lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev);

            lapb_send_control(lapb, LAPB_UA, frame->pf,

                      LAPB_RESPONSE);

            lapb_stop_t1timer(lapb);

            lapb_stop_t2timer(lapb);

            lapb->state     = LAPB_STATE_3;