| 1 |
1275 |
phoenix |
/*
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* LAPB release 002
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*
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| 4 |
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* History
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* LAPB 001 Jonathan Naulor Started Coding
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* LAPB 002 Jonathan Naylor New timer architecture.
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* 2000-10-29 Henner Eisen lapb_data_indication() return status.
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*/
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#include <linux/errno.h>
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| 19 |
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#include <linux/types.h>
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| 20 |
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#include <linux/socket.h>
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| 21 |
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#include <linux/in.h>
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| 22 |
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#include <linux/kernel.h>
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| 23 |
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#include <linux/sched.h>
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| 24 |
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#include <linux/timer.h>
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| 25 |
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#include <linux/string.h>
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| 26 |
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#include <linux/sockios.h>
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| 27 |
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#include <linux/net.h>
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| 28 |
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#include <linux/inet.h>
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| 29 |
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#include <linux/netdevice.h>
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| 30 |
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#include <linux/skbuff.h>
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#include <net/sock.h>
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| 32 |
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#include <asm/uaccess.h>
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| 33 |
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#include <asm/system.h>
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| 34 |
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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| 36 |
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#include <linux/interrupt.h>
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| 37 |
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#include <net/lapb.h>
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| 38 |
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| 39 |
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/*
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| 40 |
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* State machine for state 0, Disconnected State.
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| 41 |
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* The handling of the timer(s) is in file lapb_timer.c.
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| 42 |
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*/
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| 43 |
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static void lapb_state0_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
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| 44 |
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{
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| 45 |
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switch (frame->type) {
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| 46 |
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case LAPB_SABM:
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| 47 |
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#if LAPB_DEBUG > 1
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| 48 |
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printk(KERN_DEBUG "lapb: (%p) S0 RX SABM(%d)\n", lapb->token, frame->pf);
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| 49 |
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#endif
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| 50 |
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if (lapb->mode & LAPB_EXTENDED) {
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| 51 |
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#if LAPB_DEBUG > 1
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| 52 |
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printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", lapb->token, frame->pf);
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| 53 |
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#endif
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| 54 |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
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| 55 |
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} else {
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| 56 |
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#if LAPB_DEBUG > 1
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| 57 |
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printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
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| 58 |
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#endif
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| 59 |
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#if LAPB_DEBUG > 0
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| 60 |
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printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->token);
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| 61 |
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#endif
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| 62 |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
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| 63 |
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lapb_stop_t1timer(lapb);
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| 64 |
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lapb_stop_t2timer(lapb);
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| 65 |
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lapb->state = LAPB_STATE_3;
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| 66 |
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lapb->condition = 0x00;
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| 67 |
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lapb->n2count = 0;
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| 68 |
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lapb->vs = 0;
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| 69 |
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lapb->vr = 0;
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| 70 |
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lapb->va = 0;
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| 71 |
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lapb_connect_indication(lapb, LAPB_OK);
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| 72 |
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}
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| 73 |
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break;
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| 74 |
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| 75 |
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case LAPB_SABME:
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| 76 |
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#if LAPB_DEBUG > 1
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| 77 |
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printk(KERN_DEBUG "lapb: (%p) S0 RX SABME(%d)\n", lapb->token, frame->pf);
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| 78 |
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#endif
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| 79 |
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if (lapb->mode & LAPB_EXTENDED) {
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| 80 |
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#if LAPB_DEBUG > 1
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| 81 |
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printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
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| 82 |
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#endif
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| 83 |
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#if LAPB_DEBUG > 0
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| 84 |
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printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->token);
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| 85 |
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#endif
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| 86 |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
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| 87 |
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lapb_stop_t1timer(lapb);
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| 88 |
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lapb_stop_t2timer(lapb);
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| 89 |
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lapb->state = LAPB_STATE_3;
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| 90 |
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lapb->condition = 0x00;
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| 91 |
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lapb->n2count = 0;
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| 92 |
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lapb->vs = 0;
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| 93 |
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lapb->vr = 0;
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| 94 |
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lapb->va = 0;
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| 95 |
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lapb_connect_indication(lapb, LAPB_OK);
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| 96 |
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} else {
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| 97 |
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#if LAPB_DEBUG > 1
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| 98 |
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printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", lapb->token, frame->pf);
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| 99 |
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#endif
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| 100 |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
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| 101 |
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}
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| 102 |
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break;
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| 103 |
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| 104 |
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case LAPB_DISC:
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| 105 |
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#if LAPB_DEBUG > 1
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| 106 |
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printk(KERN_DEBUG "lapb: (%p) S0 RX DISC(%d)\n", lapb->token, frame->pf);
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| 107 |
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printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
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| 108 |
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#endif
|
| 109 |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
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| 110 |
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break;
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| 111 |
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| 112 |
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default:
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| 113 |
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break;
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| 114 |
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}
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| 115 |
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| 116 |
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kfree_skb(skb);
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| 117 |
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}
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| 118 |
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| 119 |
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/*
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| 120 |
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* State machine for state 1, Awaiting Connection State.
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| 121 |
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* The handling of the timer(s) is in file lapb_timer.c.
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| 122 |
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*/
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| 123 |
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static void lapb_state1_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
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| 124 |
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{
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| 125 |
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switch (frame->type) {
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| 126 |
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case LAPB_SABM:
|
| 127 |
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#if LAPB_DEBUG > 1
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| 128 |
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printk(KERN_DEBUG "lapb: (%p) S1 RX SABM(%d)\n", lapb->token, frame->pf);
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| 129 |
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#endif
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| 130 |
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if (lapb->mode & LAPB_EXTENDED) {
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| 131 |
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#if LAPB_DEBUG > 1
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| 132 |
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printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
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| 133 |
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#endif
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| 134 |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
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| 135 |
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} else {
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| 136 |
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#if LAPB_DEBUG > 1
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| 137 |
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printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", lapb->token, frame->pf);
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| 138 |
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#endif
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| 139 |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
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| 140 |
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}
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| 141 |
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break;
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| 142 |
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| 143 |
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case LAPB_SABME:
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| 144 |
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#if LAPB_DEBUG > 1
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| 145 |
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printk(KERN_DEBUG "lapb: (%p) S1 RX SABME(%d)\n", lapb->token, frame->pf);
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| 146 |
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#endif
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| 147 |
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if (lapb->mode & LAPB_EXTENDED) {
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| 148 |
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#if LAPB_DEBUG > 1
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| 149 |
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printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", lapb->token, frame->pf);
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| 150 |
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#endif
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| 151 |
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
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| 152 |
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} else {
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| 153 |
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#if LAPB_DEBUG > 1
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| 154 |
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printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
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| 155 |
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#endif
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| 156 |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
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| 157 |
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}
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| 158 |
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break;
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| 159 |
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| 160 |
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case LAPB_DISC:
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| 161 |
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#if LAPB_DEBUG > 1
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| 162 |
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printk(KERN_DEBUG "lapb: (%p) S1 RX DISC(%d)\n", lapb->token, frame->pf);
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| 163 |
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printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
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| 164 |
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#endif
|
| 165 |
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
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| 166 |
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break;
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| 167 |
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|
| 168 |
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case LAPB_UA:
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| 169 |
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#if LAPB_DEBUG > 1
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| 170 |
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printk(KERN_DEBUG "lapb: (%p) S1 RX UA(%d)\n", lapb->token, frame->pf);
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| 171 |
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#endif
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| 172 |
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if (frame->pf) {
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| 173 |
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#if LAPB_DEBUG > 0
|
| 174 |
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printk(KERN_DEBUG "lapb: (%p) S1 -> S3\n", lapb->token);
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| 175 |
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#endif
|
| 176 |
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lapb_stop_t1timer(lapb);
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| 177 |
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lapb_stop_t2timer(lapb);
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| 178 |
|
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lapb->state = LAPB_STATE_3;
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| 179 |
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lapb->condition = 0x00;
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| 180 |
|
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lapb->n2count = 0;
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| 181 |
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lapb->vs = 0;
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| 182 |
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lapb->vr = 0;
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| 183 |
|
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lapb->va = 0;
|
| 184 |
|
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lapb_connect_confirmation(lapb, LAPB_OK);
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| 185 |
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}
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| 186 |
|
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break;
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| 187 |
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|
| 188 |
|
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case LAPB_DM:
|
| 189 |
|
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#if LAPB_DEBUG > 1
|
| 190 |
|
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printk(KERN_DEBUG "lapb: (%p) S1 RX DM(%d)\n", lapb->token, frame->pf);
|
| 191 |
|
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#endif
|
| 192 |
|
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if (frame->pf) {
|
| 193 |
|
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#if LAPB_DEBUG > 0
|
| 194 |
|
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printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
|
| 195 |
|
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#endif
|
| 196 |
|
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lapb_clear_queues(lapb);
|
| 197 |
|
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lapb->state = LAPB_STATE_0;
|
| 198 |
|
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lapb_start_t1timer(lapb);
|
| 199 |
|
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lapb_stop_t2timer(lapb);
|
| 200 |
|
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lapb_disconnect_indication(lapb, LAPB_REFUSED);
|
| 201 |
|
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}
|
| 202 |
|
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break;
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| 203 |
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|
| 204 |
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default:
|
| 205 |
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break;
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| 206 |
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}
|
| 207 |
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|
|
| 208 |
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kfree_skb(skb);
|
| 209 |
|
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}
|
| 210 |
|
|
|
| 211 |
|
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/*
|
| 212 |
|
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* State machine for state 2, Awaiting Release State.
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| 213 |
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* The handling of the timer(s) is in file lapb_timer.c
|
| 214 |
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*/
|
| 215 |
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static void lapb_state2_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
|
| 216 |
|
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{
|
| 217 |
|
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switch (frame->type) {
|
| 218 |
|
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case LAPB_SABM:
|
| 219 |
|
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case LAPB_SABME:
|
| 220 |
|
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#if LAPB_DEBUG > 1
|
| 221 |
|
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printk(KERN_DEBUG "lapb: (%p) S2 RX {SABM,SABME}(%d)\n", lapb->token, frame->pf);
|
| 222 |
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printk(KERN_DEBUG "lapb: (%p) S2 TX DM(%d)\n", lapb->token, frame->pf);
|
| 223 |
|
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#endif
|
| 224 |
|
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lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 225 |
|
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break;
|
| 226 |
|
|
|
| 227 |
|
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case LAPB_DISC:
|
| 228 |
|
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#if LAPB_DEBUG > 1
|
| 229 |
|
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printk(KERN_DEBUG "lapb: (%p) S2 RX DISC(%d)\n", lapb->token, frame->pf);
|
| 230 |
|
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printk(KERN_DEBUG "lapb: (%p) S2 TX UA(%d)\n", lapb->token, frame->pf);
|
| 231 |
|
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#endif
|
| 232 |
|
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lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 233 |
|
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break;
|
| 234 |
|
|
|
| 235 |
|
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case LAPB_UA:
|
| 236 |
|
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#if LAPB_DEBUG > 1
|
| 237 |
|
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printk(KERN_DEBUG "lapb: (%p) S2 RX UA(%d)\n", lapb->token, frame->pf);
|
| 238 |
|
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#endif
|
| 239 |
|
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if (frame->pf) {
|
| 240 |
|
|
#if LAPB_DEBUG > 0
|
| 241 |
|
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printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
|
| 242 |
|
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#endif
|
| 243 |
|
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lapb->state = LAPB_STATE_0;
|
| 244 |
|
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lapb_start_t1timer(lapb);
|
| 245 |
|
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lapb_stop_t2timer(lapb);
|
| 246 |
|
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lapb_disconnect_confirmation(lapb, LAPB_OK);
|
| 247 |
|
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}
|
| 248 |
|
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break;
|
| 249 |
|
|
|
| 250 |
|
|
case LAPB_DM:
|
| 251 |
|
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#if LAPB_DEBUG > 1
|
| 252 |
|
|
printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", lapb->token, frame->pf);
|
| 253 |
|
|
#endif
|
| 254 |
|
|
if (frame->pf) {
|
| 255 |
|
|
#if LAPB_DEBUG > 0
|
| 256 |
|
|
printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
|
| 257 |
|
|
#endif
|
| 258 |
|
|
lapb->state = LAPB_STATE_0;
|
| 259 |
|
|
lapb_start_t1timer(lapb);
|
| 260 |
|
|
lapb_stop_t2timer(lapb);
|
| 261 |
|
|
lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED);
|
| 262 |
|
|
}
|
| 263 |
|
|
break;
|
| 264 |
|
|
|
| 265 |
|
|
case LAPB_I:
|
| 266 |
|
|
case LAPB_REJ:
|
| 267 |
|
|
case LAPB_RNR:
|
| 268 |
|
|
case LAPB_RR:
|
| 269 |
|
|
#if LAPB_DEBUG > 1
|
| 270 |
|
|
printk(KERN_DEBUG "lapb: (%p) S2 RX {I,REJ,RNR,RR}(%d)\n", lapb->token, frame->pf);
|
| 271 |
|
|
printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", lapb->token, frame->pf);
|
| 272 |
|
|
#endif
|
| 273 |
|
|
if (frame->pf) lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 274 |
|
|
break;
|
| 275 |
|
|
|
| 276 |
|
|
default:
|
| 277 |
|
|
break;
|
| 278 |
|
|
}
|
| 279 |
|
|
|
| 280 |
|
|
kfree_skb(skb);
|
| 281 |
|
|
}
|
| 282 |
|
|
|
| 283 |
|
|
/*
|
| 284 |
|
|
* State machine for state 3, Connected State.
|
| 285 |
|
|
* The handling of the timer(s) is in file lapb_timer.c
|
| 286 |
|
|
*/
|
| 287 |
|
|
static void lapb_state3_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
|
| 288 |
|
|
{
|
| 289 |
|
|
int queued = 0;
|
| 290 |
|
|
int modulus;
|
| 291 |
|
|
|
| 292 |
|
|
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
|
| 293 |
|
|
|
| 294 |
|
|
switch (frame->type) {
|
| 295 |
|
|
case LAPB_SABM:
|
| 296 |
|
|
#if LAPB_DEBUG > 1
|
| 297 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX SABM(%d)\n", lapb->token, frame->pf);
|
| 298 |
|
|
#endif
|
| 299 |
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
| 300 |
|
|
#if LAPB_DEBUG > 1
|
| 301 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", lapb->token, frame->pf);
|
| 302 |
|
|
#endif
|
| 303 |
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 304 |
|
|
} else {
|
| 305 |
|
|
#if LAPB_DEBUG > 1
|
| 306 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", lapb->token, frame->pf);
|
| 307 |
|
|
#endif
|
| 308 |
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 309 |
|
|
lapb_stop_t1timer(lapb);
|
| 310 |
|
|
lapb_stop_t2timer(lapb);
|
| 311 |
|
|
lapb->condition = 0x00;
|
| 312 |
|
|
lapb->n2count = 0;
|
| 313 |
|
|
lapb->vs = 0;
|
| 314 |
|
|
lapb->vr = 0;
|
| 315 |
|
|
lapb->va = 0;
|
| 316 |
|
|
lapb_requeue_frames(lapb);
|
| 317 |
|
|
}
|
| 318 |
|
|
break;
|
| 319 |
|
|
|
| 320 |
|
|
case LAPB_SABME:
|
| 321 |
|
|
#if LAPB_DEBUG > 1
|
| 322 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX SABME(%d)\n", lapb->token, frame->pf);
|
| 323 |
|
|
#endif
|
| 324 |
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
| 325 |
|
|
#if LAPB_DEBUG > 1
|
| 326 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", lapb->token, frame->pf);
|
| 327 |
|
|
#endif
|
| 328 |
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 329 |
|
|
lapb_stop_t1timer(lapb);
|
| 330 |
|
|
lapb_stop_t2timer(lapb);
|
| 331 |
|
|
lapb->condition = 0x00;
|
| 332 |
|
|
lapb->n2count = 0;
|
| 333 |
|
|
lapb->vs = 0;
|
| 334 |
|
|
lapb->vr = 0;
|
| 335 |
|
|
lapb->va = 0;
|
| 336 |
|
|
lapb_requeue_frames(lapb);
|
| 337 |
|
|
} else {
|
| 338 |
|
|
#if LAPB_DEBUG > 1
|
| 339 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", lapb->token, frame->pf);
|
| 340 |
|
|
#endif
|
| 341 |
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 342 |
|
|
}
|
| 343 |
|
|
break;
|
| 344 |
|
|
|
| 345 |
|
|
case LAPB_DISC:
|
| 346 |
|
|
#if LAPB_DEBUG > 1
|
| 347 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX DISC(%d)\n", lapb->token, frame->pf);
|
| 348 |
|
|
#endif
|
| 349 |
|
|
#if LAPB_DEBUG > 0
|
| 350 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
|
| 351 |
|
|
#endif
|
| 352 |
|
|
lapb_clear_queues(lapb);
|
| 353 |
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 354 |
|
|
lapb_start_t1timer(lapb);
|
| 355 |
|
|
lapb_stop_t2timer(lapb);
|
| 356 |
|
|
lapb->state = LAPB_STATE_0;
|
| 357 |
|
|
lapb_disconnect_indication(lapb, LAPB_OK);
|
| 358 |
|
|
break;
|
| 359 |
|
|
|
| 360 |
|
|
case LAPB_DM:
|
| 361 |
|
|
#if LAPB_DEBUG > 1
|
| 362 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX DM(%d)\n", lapb->token, frame->pf);
|
| 363 |
|
|
#endif
|
| 364 |
|
|
#if LAPB_DEBUG > 0
|
| 365 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
|
| 366 |
|
|
#endif
|
| 367 |
|
|
lapb_clear_queues(lapb);
|
| 368 |
|
|
lapb->state = LAPB_STATE_0;
|
| 369 |
|
|
lapb_start_t1timer(lapb);
|
| 370 |
|
|
lapb_stop_t2timer(lapb);
|
| 371 |
|
|
lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED);
|
| 372 |
|
|
break;
|
| 373 |
|
|
|
| 374 |
|
|
case LAPB_RNR:
|
| 375 |
|
|
#if LAPB_DEBUG > 1
|
| 376 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX RNR(%d) R%d\n", lapb->token, frame->pf, frame->nr);
|
| 377 |
|
|
#endif
|
| 378 |
|
|
lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION;
|
| 379 |
|
|
lapb_check_need_response(lapb, frame->cr, frame->pf);
|
| 380 |
|
|
if (lapb_validate_nr(lapb, frame->nr)) {
|
| 381 |
|
|
lapb_check_iframes_acked(lapb, frame->nr);
|
| 382 |
|
|
} else {
|
| 383 |
|
|
lapb->frmr_data = *frame;
|
| 384 |
|
|
lapb->frmr_type = LAPB_FRMR_Z;
|
| 385 |
|
|
lapb_transmit_frmr(lapb);
|
| 386 |
|
|
#if LAPB_DEBUG > 0
|
| 387 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
|
| 388 |
|
|
#endif
|
| 389 |
|
|
lapb_start_t1timer(lapb);
|
| 390 |
|
|
lapb_stop_t2timer(lapb);
|
| 391 |
|
|
lapb->state = LAPB_STATE_4;
|
| 392 |
|
|
lapb->n2count = 0;
|
| 393 |
|
|
}
|
| 394 |
|
|
break;
|
| 395 |
|
|
|
| 396 |
|
|
case LAPB_RR:
|
| 397 |
|
|
#if LAPB_DEBUG > 1
|
| 398 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX RR(%d) R%d\n", lapb->token, frame->pf, frame->nr);
|
| 399 |
|
|
#endif
|
| 400 |
|
|
lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
|
| 401 |
|
|
lapb_check_need_response(lapb, frame->cr, frame->pf);
|
| 402 |
|
|
if (lapb_validate_nr(lapb, frame->nr)) {
|
| 403 |
|
|
lapb_check_iframes_acked(lapb, frame->nr);
|
| 404 |
|
|
} else {
|
| 405 |
|
|
lapb->frmr_data = *frame;
|
| 406 |
|
|
lapb->frmr_type = LAPB_FRMR_Z;
|
| 407 |
|
|
lapb_transmit_frmr(lapb);
|
| 408 |
|
|
#if LAPB_DEBUG > 0
|
| 409 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
|
| 410 |
|
|
#endif
|
| 411 |
|
|
lapb_start_t1timer(lapb);
|
| 412 |
|
|
lapb_stop_t2timer(lapb);
|
| 413 |
|
|
lapb->state = LAPB_STATE_4;
|
| 414 |
|
|
lapb->n2count = 0;
|
| 415 |
|
|
}
|
| 416 |
|
|
break;
|
| 417 |
|
|
|
| 418 |
|
|
case LAPB_REJ:
|
| 419 |
|
|
#if LAPB_DEBUG > 1
|
| 420 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX REJ(%d) R%d\n", lapb->token, frame->pf, frame->nr);
|
| 421 |
|
|
#endif
|
| 422 |
|
|
lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
|
| 423 |
|
|
lapb_check_need_response(lapb, frame->cr, frame->pf);
|
| 424 |
|
|
if (lapb_validate_nr(lapb, frame->nr)) {
|
| 425 |
|
|
lapb_frames_acked(lapb, frame->nr);
|
| 426 |
|
|
lapb_stop_t1timer(lapb);
|
| 427 |
|
|
lapb->n2count = 0;
|
| 428 |
|
|
lapb_requeue_frames(lapb);
|
| 429 |
|
|
} else {
|
| 430 |
|
|
lapb->frmr_data = *frame;
|
| 431 |
|
|
lapb->frmr_type = LAPB_FRMR_Z;
|
| 432 |
|
|
lapb_transmit_frmr(lapb);
|
| 433 |
|
|
#if LAPB_DEBUG > 0
|
| 434 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
|
| 435 |
|
|
#endif
|
| 436 |
|
|
lapb_start_t1timer(lapb);
|
| 437 |
|
|
lapb_stop_t2timer(lapb);
|
| 438 |
|
|
lapb->state = LAPB_STATE_4;
|
| 439 |
|
|
lapb->n2count = 0;
|
| 440 |
|
|
}
|
| 441 |
|
|
break;
|
| 442 |
|
|
|
| 443 |
|
|
case LAPB_I:
|
| 444 |
|
|
#if LAPB_DEBUG > 1
|
| 445 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX I(%d) S%d R%d\n", lapb->token, frame->pf, frame->ns, frame->nr);
|
| 446 |
|
|
#endif
|
| 447 |
|
|
if (!lapb_validate_nr(lapb, frame->nr)) {
|
| 448 |
|
|
lapb->frmr_data = *frame;
|
| 449 |
|
|
lapb->frmr_type = LAPB_FRMR_Z;
|
| 450 |
|
|
lapb_transmit_frmr(lapb);
|
| 451 |
|
|
#if LAPB_DEBUG > 0
|
| 452 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
|
| 453 |
|
|
#endif
|
| 454 |
|
|
lapb_start_t1timer(lapb);
|
| 455 |
|
|
lapb_stop_t2timer(lapb);
|
| 456 |
|
|
lapb->state = LAPB_STATE_4;
|
| 457 |
|
|
lapb->n2count = 0;
|
| 458 |
|
|
break;
|
| 459 |
|
|
}
|
| 460 |
|
|
if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) {
|
| 461 |
|
|
lapb_frames_acked(lapb, frame->nr);
|
| 462 |
|
|
} else {
|
| 463 |
|
|
lapb_check_iframes_acked(lapb, frame->nr);
|
| 464 |
|
|
}
|
| 465 |
|
|
if (frame->ns == lapb->vr) {
|
| 466 |
|
|
int cn;
|
| 467 |
|
|
cn = lapb_data_indication(lapb, skb);
|
| 468 |
|
|
queued = 1;
|
| 469 |
|
|
/*
|
| 470 |
|
|
* If upper layer has dropped the frame, we
|
| 471 |
|
|
* basically ignore any further protocol
|
| 472 |
|
|
* processing. This will cause the peer
|
| 473 |
|
|
* to re-transmit the frame later like
|
| 474 |
|
|
* a frame lost on the wire.
|
| 475 |
|
|
*/
|
| 476 |
|
|
if(cn == NET_RX_DROP){
|
| 477 |
|
|
printk(KERN_DEBUG "LAPB: rx congestion\n");
|
| 478 |
|
|
break;
|
| 479 |
|
|
}
|
| 480 |
|
|
lapb->vr = (lapb->vr + 1) % modulus;
|
| 481 |
|
|
lapb->condition &= ~LAPB_REJECT_CONDITION;
|
| 482 |
|
|
if (frame->pf) {
|
| 483 |
|
|
lapb_enquiry_response(lapb);
|
| 484 |
|
|
} else {
|
| 485 |
|
|
if (!(lapb->condition & LAPB_ACK_PENDING_CONDITION)) {
|
| 486 |
|
|
lapb->condition |= LAPB_ACK_PENDING_CONDITION;
|
| 487 |
|
|
lapb_start_t2timer(lapb);
|
| 488 |
|
|
}
|
| 489 |
|
|
}
|
| 490 |
|
|
} else {
|
| 491 |
|
|
if (lapb->condition & LAPB_REJECT_CONDITION) {
|
| 492 |
|
|
if (frame->pf)
|
| 493 |
|
|
lapb_enquiry_response(lapb);
|
| 494 |
|
|
} else {
|
| 495 |
|
|
#if LAPB_DEBUG > 1
|
| 496 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 TX REJ(%d) R%d\n", lapb->token, frame->pf, lapb->vr);
|
| 497 |
|
|
#endif
|
| 498 |
|
|
lapb->condition |= LAPB_REJECT_CONDITION;
|
| 499 |
|
|
lapb_send_control(lapb, LAPB_REJ, frame->pf, LAPB_RESPONSE);
|
| 500 |
|
|
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
|
| 501 |
|
|
}
|
| 502 |
|
|
}
|
| 503 |
|
|
break;
|
| 504 |
|
|
|
| 505 |
|
|
case LAPB_FRMR:
|
| 506 |
|
|
#if LAPB_DEBUG > 1
|
| 507 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX FRMR(%d) %02X %02X %02X %02X %02X\n", lapb->token, frame->pf, skb->data[0], skb->data[1], skb->data[2], skb->data[3], skb->data[4]);
|
| 508 |
|
|
#endif
|
| 509 |
|
|
lapb_establish_data_link(lapb);
|
| 510 |
|
|
#if LAPB_DEBUG > 0
|
| 511 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S1\n", lapb->token);
|
| 512 |
|
|
#endif
|
| 513 |
|
|
lapb_requeue_frames(lapb);
|
| 514 |
|
|
lapb->state = LAPB_STATE_1;
|
| 515 |
|
|
break;
|
| 516 |
|
|
|
| 517 |
|
|
case LAPB_ILLEGAL:
|
| 518 |
|
|
#if LAPB_DEBUG > 1
|
| 519 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 RX ILLEGAL(%d)\n", lapb->token, frame->pf);
|
| 520 |
|
|
#endif
|
| 521 |
|
|
lapb->frmr_data = *frame;
|
| 522 |
|
|
lapb->frmr_type = LAPB_FRMR_W;
|
| 523 |
|
|
lapb_transmit_frmr(lapb);
|
| 524 |
|
|
#if LAPB_DEBUG > 0
|
| 525 |
|
|
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
|
| 526 |
|
|
#endif
|
| 527 |
|
|
lapb_start_t1timer(lapb);
|
| 528 |
|
|
lapb_stop_t2timer(lapb);
|
| 529 |
|
|
lapb->state = LAPB_STATE_4;
|
| 530 |
|
|
lapb->n2count = 0;
|
| 531 |
|
|
break;
|
| 532 |
|
|
|
| 533 |
|
|
default:
|
| 534 |
|
|
break;
|
| 535 |
|
|
}
|
| 536 |
|
|
|
| 537 |
|
|
if (!queued)
|
| 538 |
|
|
kfree_skb(skb);
|
| 539 |
|
|
}
|
| 540 |
|
|
|
| 541 |
|
|
/*
|
| 542 |
|
|
* State machine for state 4, Frame Reject State.
|
| 543 |
|
|
* The handling of the timer(s) is in file lapb_timer.c.
|
| 544 |
|
|
*/
|
| 545 |
|
|
static void lapb_state4_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
|
| 546 |
|
|
{
|
| 547 |
|
|
switch (frame->type) {
|
| 548 |
|
|
case LAPB_SABM:
|
| 549 |
|
|
#if LAPB_DEBUG > 1
|
| 550 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 RX SABM(%d)\n", lapb->token, frame->pf);
|
| 551 |
|
|
#endif
|
| 552 |
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
| 553 |
|
|
#if LAPB_DEBUG > 1
|
| 554 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", lapb->token, frame->pf);
|
| 555 |
|
|
#endif
|
| 556 |
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 557 |
|
|
} else {
|
| 558 |
|
|
#if LAPB_DEBUG > 1
|
| 559 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", lapb->token, frame->pf);
|
| 560 |
|
|
#endif
|
| 561 |
|
|
#if LAPB_DEBUG > 0
|
| 562 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->token);
|
| 563 |
|
|
#endif
|
| 564 |
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 565 |
|
|
lapb_stop_t1timer(lapb);
|
| 566 |
|
|
lapb_stop_t2timer(lapb);
|
| 567 |
|
|
lapb->state = LAPB_STATE_3;
|
| 568 |
|
|
lapb->condition = 0x00;
|
| 569 |
|
|
lapb->n2count = 0;
|
| 570 |
|
|
lapb->vs = 0;
|
| 571 |
|
|
lapb->vr = 0;
|
| 572 |
|
|
lapb->va = 0;
|
| 573 |
|
|
lapb_connect_indication(lapb, LAPB_OK);
|
| 574 |
|
|
}
|
| 575 |
|
|
break;
|
| 576 |
|
|
|
| 577 |
|
|
case LAPB_SABME:
|
| 578 |
|
|
#if LAPB_DEBUG > 1
|
| 579 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 RX SABME(%d)\n", lapb->token, frame->pf);
|
| 580 |
|
|
#endif
|
| 581 |
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
| 582 |
|
|
#if LAPB_DEBUG > 1
|
| 583 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", lapb->token, frame->pf);
|
| 584 |
|
|
#endif
|
| 585 |
|
|
#if LAPB_DEBUG > 0
|
| 586 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->token);
|
| 587 |
|
|
#endif
|
| 588 |
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
| 589 |
|
|
lapb_stop_t1timer(lapb);
|
| 590 |
|
|
lapb_stop_t2timer(lapb);
|
| 591 |
|
|
lapb->state = LAPB_STATE_3;
|
| 592 |
|
|
lapb->condition = 0x00;
|
| 593 |
|
|
lapb->n2count = 0;
|
| 594 |
|
|
lapb->vs = 0;
|
| 595 |
|
|
lapb->vr = 0;
|
| 596 |
|
|
lapb->va = 0;
|
| 597 |
|
|
lapb_connect_indication(lapb, LAPB_OK);
|
| 598 |
|
|
} else {
|
| 599 |
|
|
#if LAPB_DEBUG > 1
|
| 600 |
|
|
printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", lapb->token, frame->pf);
|
| 601 |
|
|
#endif
|
| 602 |
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
| 603 |
|
|
}
|
| 604 |
|
|
break;
|
| 605 |
|
|
|
| 606 |
|
|
default:
|
| 607 |
|
|
break;
|
| 608 |
|
|
}
|
| 609 |
|
|
|
| 610 |
|
|
kfree_skb(skb);
|
| 611 |
|
|
}
|
| 612 |
|
|
|
| 613 |
|
|
/*
|
| 614 |
|
|
* Process an incoming LAPB frame
|
| 615 |
|
|
*/
|
| 616 |
|
|
void lapb_data_input(lapb_cb *lapb, struct sk_buff *skb)
|
| 617 |
|
|
{
|
| 618 |
|
|
struct lapb_frame frame;
|
| 619 |
|
|
|
| 620 |
|
|
lapb_decode(lapb, skb, &frame);
|
| 621 |
|
|
|
| 622 |
|
|
switch (lapb->state) {
|
| 623 |
|
|
case LAPB_STATE_0:
|
| 624 |
|
|
lapb_state0_machine(lapb, skb, &frame);
|
| 625 |
|
|
break;
|
| 626 |
|
|
case LAPB_STATE_1:
|
| 627 |
|
|
lapb_state1_machine(lapb, skb, &frame);
|
| 628 |
|
|
break;
|
| 629 |
|
|
case LAPB_STATE_2:
|
| 630 |
|
|
lapb_state2_machine(lapb, skb, &frame);
|
| 631 |
|
|
break;
|
| 632 |
|
|
case LAPB_STATE_3:
|
| 633 |
|
|
lapb_state3_machine(lapb, skb, &frame);
|
| 634 |
|
|
break;
|
| 635 |
|
|
case LAPB_STATE_4:
|
| 636 |
|
|
lapb_state4_machine(lapb, skb, &frame);
|
| 637 |
|
|
break;
|
| 638 |
|
|
}
|
| 639 |
|
|
|
| 640 |
|
|
lapb_kick(lapb);
|
| 641 |
|
|
}
|
