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  • This comparison shows the changes necessary to convert path 
    /or1k/tags/LINUX_2_4_26_OR32/linux/linux-2.4/net/lapb
    from Rev 1279 to Rev 1765
    ↔ Reverse comparison
  •

Rev 1279 → Rev 1765

/lapb_timer.c
0,0 → 1,189
/*
* 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 Naylor Started Coding
* LAPB 002 Jonathan Naylor New timer architecture.
*/
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>
 
static void lapb_t1timer_expiry(unsigned long);
static void lapb_t2timer_expiry(unsigned long);
 
void lapb_start_t1timer(lapb_cb *lapb)
{
del_timer(&lapb->t1timer);
 
lapb->t1timer.data = (unsigned long)lapb;
lapb->t1timer.function = &lapb_t1timer_expiry;
lapb->t1timer.expires = jiffies + lapb->t1;
 
add_timer(&lapb->t1timer);
}
 
void lapb_start_t2timer(lapb_cb *lapb)
{
del_timer(&lapb->t2timer);
 
lapb->t2timer.data = (unsigned long)lapb;
lapb->t2timer.function = &lapb_t2timer_expiry;
lapb->t2timer.expires = jiffies + lapb->t2;
 
add_timer(&lapb->t2timer);
}
 
void lapb_stop_t1timer(lapb_cb *lapb)
{
del_timer(&lapb->t1timer);
}
 
void lapb_stop_t2timer(lapb_cb *lapb)
{
del_timer(&lapb->t2timer);
}
 
int lapb_t1timer_running(lapb_cb *lapb)
{
return timer_pending(&lapb->t1timer);
}
 
static void lapb_t2timer_expiry(unsigned long param)
{
lapb_cb *lapb = (lapb_cb *)param;
 
if (lapb->condition & LAPB_ACK_PENDING_CONDITION) {
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
lapb_timeout_response(lapb);
}
}
 
static void lapb_t1timer_expiry(unsigned long param)
{
lapb_cb *lapb = (lapb_cb *)param;
 
switch (lapb->state) {
 
/*
* If we are a DCE, keep going DM .. DM .. DM
*/
case LAPB_STATE_0:
if (lapb->mode & LAPB_DCE)
lapb_send_control(lapb, LAPB_DM, LAPB_POLLOFF, LAPB_RESPONSE);
break;
 
/*
* Awaiting connection state, send SABM(E), up to N2 times.
*/
case LAPB_STATE_1:
if (lapb->n2count == lapb->n2) {
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
#endif
return;
} else {
lapb->n2count++;
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX SABME(1)\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX SABM(1)\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
}
}
break;
 
/*
* Awaiting disconnection state, send DISC, up to N2 times.
*/
case LAPB_STATE_2:
if (lapb->n2count == lapb->n2) {
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_disconnect_confirmation(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
#endif
return;
} else {
lapb->n2count++;
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 TX DISC(1)\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
}
break;
 
/*
* Data transfer state, restransmit I frames, up to N2 times.
*/
case LAPB_STATE_3:
if (lapb->n2count == lapb->n2) {
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_stop_t2timer(lapb);
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
#endif
return;
} else {
lapb->n2count++;
lapb_requeue_frames(lapb);
}
break;
 
/*
* Frame reject state, restransmit FRMR frames, up to N2 times.
*/
case LAPB_STATE_4:
if (lapb->n2count == lapb->n2) {
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_disconnect_indication(lapb, LAPB_TIMEDOUT);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S4 -> S0\n", lapb->token);
#endif
return;
} else {
lapb->n2count++;
lapb_transmit_frmr(lapb);
}
break;
}
 
lapb_start_t1timer(lapb);
}
/lapb_in.c
0,0 → 1,641
/*
* 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.
*/
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.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(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
switch (frame->type) {
case LAPB_SABM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 RX SABM(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_3;
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_connect_indication(lapb, LAPB_OK);
}
break;
 
case LAPB_SABME:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 RX SABME(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S0 -> S3\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_3;
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_connect_indication(lapb, LAPB_OK);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
}
break;
 
case LAPB_DISC:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S0 RX DISC(%d)\n", lapb->token, frame->pf);
printk(KERN_DEBUG "lapb: (%p) S0 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
break;
 
default:
break;
}
 
kfree_skb(skb);
}
 
/*
* State machine for state 1, Awaiting Connection State.
* The handling of the timer(s) is in file lapb_timer.c.
*/
static void lapb_state1_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
switch (frame->type) {
case LAPB_SABM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 RX SABM(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
}
break;
 
case LAPB_SABME:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 RX SABME(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
}
break;
 
case LAPB_DISC:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 RX DISC(%d)\n", lapb->token, frame->pf);
printk(KERN_DEBUG "lapb: (%p) S1 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
break;
 
case LAPB_UA:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 RX UA(%d)\n", lapb->token, frame->pf);
#endif
if (frame->pf) {
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S1 -> S3\n", lapb->token);
#endif
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_3;
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_connect_confirmation(lapb, LAPB_OK);
}
break;
 
case LAPB_DM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 RX DM(%d)\n", lapb->token, frame->pf);
#endif
if (frame->pf) {
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
#endif
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb_disconnect_indication(lapb, LAPB_REFUSED);
}
break;
 
default:
break;
}
 
kfree_skb(skb);
}
 
/*
* State machine for state 2, Awaiting Release State.
* The handling of the timer(s) is in file lapb_timer.c
*/
static void lapb_state2_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
switch (frame->type) {
case LAPB_SABM:
case LAPB_SABME:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 RX {SABM,SABME}(%d)\n", lapb->token, frame->pf);
printk(KERN_DEBUG "lapb: (%p) S2 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
break;
 
case LAPB_DISC:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 RX DISC(%d)\n", lapb->token, frame->pf);
printk(KERN_DEBUG "lapb: (%p) S2 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
break;
 
case LAPB_UA:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 RX UA(%d)\n", lapb->token, frame->pf);
#endif
if (frame->pf) {
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
#endif
lapb->state = LAPB_STATE_0;
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb_disconnect_confirmation(lapb, LAPB_OK);
}
break;
 
case LAPB_DM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", lapb->token, frame->pf);
#endif
if (frame->pf) {
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S2 -> S0\n", lapb->token);
#endif
lapb->state = LAPB_STATE_0;
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb_disconnect_confirmation(lapb, LAPB_NOTCONNECTED);
}
break;
 
case LAPB_I:
case LAPB_REJ:
case LAPB_RNR:
case LAPB_RR:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S2 RX {I,REJ,RNR,RR}(%d)\n", lapb->token, frame->pf);
printk(KERN_DEBUG "lapb: (%p) S2 RX DM(%d)\n", lapb->token, frame->pf);
#endif
if (frame->pf) lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
break;
default:
break;
}
 
kfree_skb(skb);
}
 
/*
* State machine for state 3, Connected State.
* The handling of the timer(s) is in file lapb_timer.c
*/
static void lapb_state3_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
int queued = 0;
int modulus;
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
switch (frame->type) {
case LAPB_SABM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX SABM(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_requeue_frames(lapb);
}
break;
 
case LAPB_SABME:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX SABME(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 TX UA(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_requeue_frames(lapb);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
}
break;
 
case LAPB_DISC:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX DISC(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
#endif
lapb_clear_queues(lapb);
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_0;
lapb_disconnect_indication(lapb, LAPB_OK);
break;
 
case LAPB_DM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX DM(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S0\n", lapb->token);
#endif
lapb_clear_queues(lapb);
lapb->state = LAPB_STATE_0;
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb_disconnect_indication(lapb, LAPB_NOTCONNECTED);
break;
 
case LAPB_RNR:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX RNR(%d) R%d\n", lapb->token, frame->pf, frame->nr);
#endif
lapb->condition |= LAPB_PEER_RX_BUSY_CONDITION;
lapb_check_need_response(lapb, frame->cr, frame->pf);
if (lapb_validate_nr(lapb, frame->nr)) {
lapb_check_iframes_acked(lapb, frame->nr);
} else {
lapb->frmr_data = *frame;
lapb->frmr_type = LAPB_FRMR_Z;
lapb_transmit_frmr(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
#endif
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_4;
lapb->n2count = 0;
}
break;
 
case LAPB_RR:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX RR(%d) R%d\n", lapb->token, frame->pf, frame->nr);
#endif
lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
lapb_check_need_response(lapb, frame->cr, frame->pf);
if (lapb_validate_nr(lapb, frame->nr)) {
lapb_check_iframes_acked(lapb, frame->nr);
} else {
lapb->frmr_data = *frame;
lapb->frmr_type = LAPB_FRMR_Z;
lapb_transmit_frmr(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
#endif
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_4;
lapb->n2count = 0;
}
break;
 
case LAPB_REJ:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX REJ(%d) R%d\n", lapb->token, frame->pf, frame->nr);
#endif
lapb->condition &= ~LAPB_PEER_RX_BUSY_CONDITION;
lapb_check_need_response(lapb, frame->cr, frame->pf);
if (lapb_validate_nr(lapb, frame->nr)) {
lapb_frames_acked(lapb, frame->nr);
lapb_stop_t1timer(lapb);
lapb->n2count = 0;
lapb_requeue_frames(lapb);
} else {
lapb->frmr_data = *frame;
lapb->frmr_type = LAPB_FRMR_Z;
lapb_transmit_frmr(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
#endif
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_4;
lapb->n2count = 0;
}
break;
 
case LAPB_I:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX I(%d) S%d R%d\n", lapb->token, frame->pf, frame->ns, frame->nr);
#endif
if (!lapb_validate_nr(lapb, frame->nr)) {
lapb->frmr_data = *frame;
lapb->frmr_type = LAPB_FRMR_Z;
lapb_transmit_frmr(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
#endif
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_4;
lapb->n2count = 0;
break;
}
if (lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) {
lapb_frames_acked(lapb, frame->nr);
} else {
lapb_check_iframes_acked(lapb, frame->nr);
}
if (frame->ns == lapb->vr) {
int cn;
cn = lapb_data_indication(lapb, skb);
queued = 1;
/*
* If upper layer has dropped the frame, we
* basically ignore any further protocol
* processing. This will cause the peer
* to re-transmit the frame later like
* a frame lost on the wire.
*/
if(cn == NET_RX_DROP){
printk(KERN_DEBUG "LAPB: rx congestion\n");
break;
}
lapb->vr = (lapb->vr + 1) % modulus;
lapb->condition &= ~LAPB_REJECT_CONDITION;
if (frame->pf) {
lapb_enquiry_response(lapb);
} else {
if (!(lapb->condition & LAPB_ACK_PENDING_CONDITION)) {
lapb->condition |= LAPB_ACK_PENDING_CONDITION;
lapb_start_t2timer(lapb);
}
}
} else {
if (lapb->condition & LAPB_REJECT_CONDITION) {
if (frame->pf)
lapb_enquiry_response(lapb);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 TX REJ(%d) R%d\n", lapb->token, frame->pf, lapb->vr);
#endif
lapb->condition |= LAPB_REJECT_CONDITION;
lapb_send_control(lapb, LAPB_REJ, frame->pf, LAPB_RESPONSE);
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
}
}
break;
 
case LAPB_FRMR:
#if LAPB_DEBUG > 1
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]);
#endif
lapb_establish_data_link(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S1\n", lapb->token);
#endif
lapb_requeue_frames(lapb);
lapb->state = LAPB_STATE_1;
break;
 
case LAPB_ILLEGAL:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 RX ILLEGAL(%d)\n", lapb->token, frame->pf);
#endif
lapb->frmr_data = *frame;
lapb->frmr_type = LAPB_FRMR_W;
lapb_transmit_frmr(lapb);
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S4\n", lapb->token);
#endif
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_4;
lapb->n2count = 0;
break;
 
default:
break;
}
 
if (!queued)
kfree_skb(skb);
}
 
/*
* State machine for state 4, Frame Reject State.
* The handling of the timer(s) is in file lapb_timer.c.
*/
static void lapb_state4_machine(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
switch (frame->type) {
case LAPB_SABM:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 RX SABM(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_3;
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_connect_indication(lapb, LAPB_OK);
}
break;
 
case LAPB_SABME:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 RX SABME(%d)\n", lapb->token, frame->pf);
#endif
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 TX UA(%d)\n", lapb->token, frame->pf);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S4 -> S3\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_3;
lapb->condition = 0x00;
lapb->n2count = 0;
lapb->vs = 0;
lapb->vr = 0;
lapb->va = 0;
lapb_connect_indication(lapb, LAPB_OK);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S4 TX DM(%d)\n", lapb->token, frame->pf);
#endif
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
}
break;
 
default:
break;
}
 
kfree_skb(skb);
}
 
/*
* Process an incoming LAPB frame
*/
void lapb_data_input(lapb_cb *lapb, struct sk_buff *skb)
{
struct lapb_frame frame;
 
lapb_decode(lapb, skb, &frame);
 
switch (lapb->state) {
case LAPB_STATE_0:
lapb_state0_machine(lapb, skb, &frame);
break;
case LAPB_STATE_1:
lapb_state1_machine(lapb, skb, &frame);
break;
case LAPB_STATE_2:
lapb_state2_machine(lapb, skb, &frame);
break;
case LAPB_STATE_3:
lapb_state3_machine(lapb, skb, &frame);
break;
case LAPB_STATE_4:
lapb_state4_machine(lapb, skb, &frame);
break;
}
 
lapb_kick(lapb);
}
/lapb_out.c
0,0 → 1,223
/*
* 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 Naylor Started Coding
* LAPB 002 Jonathan Naylor New timer architecture.
*/
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <net/lapb.h>
 
/*
* This procedure is passed a buffer descriptor for an iframe. It builds
* the rest of the control part of the frame and then writes it out.
*/
static void lapb_send_iframe(lapb_cb *lapb, struct sk_buff *skb, int poll_bit)
{
unsigned char *frame;
 
if (skb == NULL)
return;
 
if (lapb->mode & LAPB_EXTENDED) {
frame = skb_push(skb, 2);
 
frame[0] = LAPB_I;
frame[0] |= (lapb->vs << 1);
frame[1] = (poll_bit) ? LAPB_EPF : 0;
frame[1] |= (lapb->vr << 1);
} else {
frame = skb_push(skb, 1);
 
*frame = LAPB_I;
*frame |= (poll_bit) ? LAPB_SPF : 0;
*frame |= (lapb->vr << 5);
*frame |= (lapb->vs << 1);
}
 
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX I(%d) S%d R%d\n", lapb->token, lapb->state, poll_bit, lapb->vs, lapb->vr);
#endif
 
lapb_transmit_buffer(lapb, skb, LAPB_COMMAND);
}
 
void lapb_kick(lapb_cb *lapb)
{
struct sk_buff *skb, *skbn;
unsigned short modulus, start, end;
 
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
start = (skb_peek(&lapb->ack_queue) == NULL) ? lapb->va : lapb->vs;
end = (lapb->va + lapb->window) % modulus;
 
if (!(lapb->condition & LAPB_PEER_RX_BUSY_CONDITION) &&
start != end &&
skb_peek(&lapb->write_queue) != NULL) {
 
lapb->vs = start;
 
/*
* Dequeue the frame and copy it.
*/
skb = skb_dequeue(&lapb->write_queue);
 
do {
if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
skb_queue_head(&lapb->write_queue, skb);
break;
}
 
if (skb->sk != NULL)
skb_set_owner_w(skbn, skb->sk);
 
/*
* Transmit the frame copy.
*/
lapb_send_iframe(lapb, skbn, LAPB_POLLOFF);
 
lapb->vs = (lapb->vs + 1) % modulus;
 
/*
* Requeue the original data frame.
*/
skb_queue_tail(&lapb->ack_queue, skb);
 
} while (lapb->vs != end && (skb = skb_dequeue(&lapb->write_queue)) != NULL);
 
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
 
if (!lapb_t1timer_running(lapb))
lapb_start_t1timer(lapb);
}
}
 
void lapb_transmit_buffer(lapb_cb *lapb, struct sk_buff *skb, int type)
{
unsigned char *ptr;
 
ptr = skb_push(skb, 1);
 
if (lapb->mode & LAPB_MLP) {
if (lapb->mode & LAPB_DCE) {
if (type == LAPB_COMMAND)
*ptr = LAPB_ADDR_C;
if (type == LAPB_RESPONSE)
*ptr = LAPB_ADDR_D;
} else {
if (type == LAPB_COMMAND)
*ptr = LAPB_ADDR_D;
if (type == LAPB_RESPONSE)
*ptr = LAPB_ADDR_C;
}
} else {
if (lapb->mode & LAPB_DCE) {
if (type == LAPB_COMMAND)
*ptr = LAPB_ADDR_A;
if (type == LAPB_RESPONSE)
*ptr = LAPB_ADDR_B;
} else {
if (type == LAPB_COMMAND)
*ptr = LAPB_ADDR_B;
if (type == LAPB_RESPONSE)
*ptr = LAPB_ADDR_A;
}
}
 
#if LAPB_DEBUG > 2
printk(KERN_DEBUG "lapb: (%p) S%d TX %02X %02X %02X\n", lapb->token, lapb->state, skb->data[0], skb->data[1], skb->data[2]);
#endif
 
if (!lapb_data_transmit(lapb, skb))
kfree_skb(skb);
}
 
void lapb_establish_data_link(lapb_cb *lapb)
{
lapb->condition = 0x00;
lapb->n2count = 0;
 
if (lapb->mode & LAPB_EXTENDED) {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX SABME(1)\n", lapb->token, lapb->state);
#endif
lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
} else {
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX SABM(1)\n", lapb->token, lapb->state);
#endif
lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
}
 
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
}
 
void lapb_enquiry_response(lapb_cb *lapb)
{
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(1) R%d\n", lapb->token, lapb->state, lapb->vr);
#endif
 
lapb_send_control(lapb, LAPB_RR, LAPB_POLLON, LAPB_RESPONSE);
 
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
}
 
void lapb_timeout_response(lapb_cb *lapb)
{
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX RR(0) R%d\n", lapb->token, lapb->state, lapb->vr);
#endif
 
lapb_send_control(lapb, LAPB_RR, LAPB_POLLOFF, LAPB_RESPONSE);
 
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
}
 
void lapb_check_iframes_acked(lapb_cb *lapb, unsigned short nr)
{
if (lapb->vs == nr) {
lapb_frames_acked(lapb, nr);
lapb_stop_t1timer(lapb);
lapb->n2count = 0;
} else {
if (lapb->va != nr) {
lapb_frames_acked(lapb, nr);
lapb_start_t1timer(lapb);
}
}
}
 
void lapb_check_need_response(lapb_cb *lapb, int type, int pf)
{
if (type == LAPB_COMMAND && pf)
lapb_enquiry_response(lapb);
}
/lapb_iface.c
0,0 → 1,412
/*
* 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 Naylor Started Coding
* LAPB 002 Jonathan Naylor New timer architecture.
* 2000-10-29 Henner Eisen lapb_data_indication() return status.
*/
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <net/lapb.h>
 
static lapb_cb *volatile lapb_list /* = NULL initially */;
 
/*
* Free an allocated lapb control block. This is done to centralise
* the MOD count code.
*/
static void lapb_free_cb(lapb_cb *lapb)
{
kfree(lapb);
 
MOD_DEC_USE_COUNT;
}
 
/*
* Socket removal during an interrupt is now safe.
*/
static void lapb_remove_cb(lapb_cb *lapb)
{
lapb_cb *s;
unsigned long flags;
 
save_flags(flags); cli();
 
if ((s = lapb_list) == lapb) {
lapb_list = s->next;
restore_flags(flags);
return;
}
 
while (s != NULL && s->next != NULL) {
if (s->next == lapb) {
s->next = lapb->next;
restore_flags(flags);
return;
}
 
s = s->next;
}
 
restore_flags(flags);
}
 
/*
* Add a socket to the bound sockets list.
*/
static void lapb_insert_cb(lapb_cb *lapb)
{
unsigned long flags;
 
save_flags(flags); cli();
 
lapb->next = lapb_list;
lapb_list = lapb;
 
restore_flags(flags);
}
 
/*
* Convert the integer token used by the device driver into a pointer
* to a LAPB control structure.
*/
static lapb_cb *lapb_tokentostruct(void *token)
{
lapb_cb *lapb;
 
for (lapb = lapb_list; lapb != NULL; lapb = lapb->next)
if (lapb->token == token)
return lapb;
 
return NULL;
}
 
/*
* Create an empty LAPB control block.
*/
static lapb_cb *lapb_create_cb(void)
{
lapb_cb *lapb;
 
if ((lapb = kmalloc(sizeof(*lapb), GFP_ATOMIC)) == NULL)
return NULL;
 
MOD_INC_USE_COUNT;
 
memset(lapb, 0x00, sizeof(*lapb));
 
skb_queue_head_init(&lapb->write_queue);
skb_queue_head_init(&lapb->ack_queue);
 
init_timer(&lapb->t1timer);
init_timer(&lapb->t2timer);
 
lapb->t1 = LAPB_DEFAULT_T1;
lapb->t2 = LAPB_DEFAULT_T2;
lapb->n2 = LAPB_DEFAULT_N2;
lapb->mode = LAPB_DEFAULT_MODE;
lapb->window = LAPB_DEFAULT_WINDOW;
lapb->state = LAPB_STATE_0;
 
return lapb;
}
 
int lapb_register(void *token, struct lapb_register_struct *callbacks)
{
lapb_cb *lapb;
 
if (lapb_tokentostruct(token) != NULL)
return LAPB_BADTOKEN;
 
if ((lapb = lapb_create_cb()) == NULL)
return LAPB_NOMEM;
 
lapb->token = token;
lapb->callbacks = *callbacks;
 
lapb_insert_cb(lapb);
 
lapb_start_t1timer(lapb);
 
return LAPB_OK;
}
 
int lapb_unregister(void *token)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
lapb_stop_t1timer(lapb);
lapb_stop_t2timer(lapb);
 
lapb_clear_queues(lapb);
 
lapb_remove_cb(lapb);
 
lapb_free_cb(lapb);
 
return LAPB_OK;
}
 
int lapb_getparms(void *token, struct lapb_parms_struct *parms)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
parms->t1 = lapb->t1 / HZ;
parms->t2 = lapb->t2 / HZ;
parms->n2 = lapb->n2;
parms->n2count = lapb->n2count;
parms->state = lapb->state;
parms->window = lapb->window;
parms->mode = lapb->mode;
 
if (!timer_pending(&lapb->t1timer))
parms->t1timer = 0;
else
parms->t1timer = (lapb->t1timer.expires - jiffies) / HZ;
 
if (!timer_pending(&lapb->t2timer))
parms->t2timer = 0;
else
parms->t2timer = (lapb->t2timer.expires - jiffies) / HZ;
 
return LAPB_OK;
}
 
int lapb_setparms(void *token, struct lapb_parms_struct *parms)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
if (parms->t1 < 1)
return LAPB_INVALUE;
 
if (parms->t2 < 1)
return LAPB_INVALUE;
 
if (parms->n2 < 1)
return LAPB_INVALUE;
 
if (lapb->state == LAPB_STATE_0) {
if (parms->mode & LAPB_EXTENDED) {
if (parms->window < 1 || parms->window > 127)
return LAPB_INVALUE;
} else {
if (parms->window < 1 || parms->window > 7)
return LAPB_INVALUE;
}
 
lapb->mode = parms->mode;
lapb->window = parms->window;
}
 
lapb->t1 = parms->t1 * HZ;
lapb->t2 = parms->t2 * HZ;
lapb->n2 = parms->n2;
 
return LAPB_OK;
}
 
int lapb_connect_request(void *token)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
switch (lapb->state) {
case LAPB_STATE_1:
return LAPB_OK;
case LAPB_STATE_3:
case LAPB_STATE_4:
return LAPB_CONNECTED;
}
 
lapb_establish_data_link(lapb);
 
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S0 -> S1\n", lapb->token);
#endif
 
lapb->state = LAPB_STATE_1;
 
return LAPB_OK;
}
 
int lapb_disconnect_request(void *token)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
switch (lapb->state) {
case LAPB_STATE_0:
return LAPB_NOTCONNECTED;
 
case LAPB_STATE_1:
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S1 TX DISC(1)\n", lapb->token);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S1 -> S0\n", lapb->token);
#endif
lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
lapb->state = LAPB_STATE_0;
lapb_start_t1timer(lapb);
return LAPB_NOTCONNECTED;
 
case LAPB_STATE_2:
return LAPB_OK;
}
 
lapb_clear_queues(lapb);
lapb->n2count = 0;
lapb_send_control(lapb, LAPB_DISC, LAPB_POLLON, LAPB_COMMAND);
lapb_start_t1timer(lapb);
lapb_stop_t2timer(lapb);
lapb->state = LAPB_STATE_2;
 
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S3 DISC(1)\n", lapb->token);
#endif
#if LAPB_DEBUG > 0
printk(KERN_DEBUG "lapb: (%p) S3 -> S2\n", lapb->token);
#endif
 
return LAPB_OK;
}
 
int lapb_data_request(void *token, struct sk_buff *skb)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
if (lapb->state != LAPB_STATE_3 && lapb->state != LAPB_STATE_4)
return LAPB_NOTCONNECTED;
 
skb_queue_tail(&lapb->write_queue, skb);
 
lapb_kick(lapb);
 
return LAPB_OK;
}
 
int lapb_data_received(void *token, struct sk_buff *skb)
{
lapb_cb *lapb;
 
if ((lapb = lapb_tokentostruct(token)) == NULL)
return LAPB_BADTOKEN;
 
lapb_data_input(lapb, skb);
 
return LAPB_OK;
}
 
void lapb_connect_confirmation(lapb_cb *lapb, int reason)
{
if (lapb->callbacks.connect_confirmation != NULL)
(lapb->callbacks.connect_confirmation)(lapb->token, reason);
}
 
void lapb_connect_indication(lapb_cb *lapb, int reason)
{
if (lapb->callbacks.connect_indication != NULL)
(lapb->callbacks.connect_indication)(lapb->token, reason);
}
 
void lapb_disconnect_confirmation(lapb_cb *lapb, int reason)
{
if (lapb->callbacks.disconnect_confirmation != NULL)
(lapb->callbacks.disconnect_confirmation)(lapb->token, reason);
}
 
void lapb_disconnect_indication(lapb_cb *lapb, int reason)
{
if (lapb->callbacks.disconnect_indication != NULL)
(lapb->callbacks.disconnect_indication)(lapb->token, reason);
}
 
int lapb_data_indication(lapb_cb *lapb, struct sk_buff *skb)
{
if (lapb->callbacks.data_indication != NULL) {
return (lapb->callbacks.data_indication)(lapb->token, skb);
}
kfree_skb(skb);
return NET_RX_CN_HIGH; /* For now; must be != NET_RX_DROP */
}
 
int lapb_data_transmit(lapb_cb *lapb, struct sk_buff *skb)
{
int used = 0;
 
if (lapb->callbacks.data_transmit != NULL) {
(lapb->callbacks.data_transmit)(lapb->token, skb);
used = 1;
}
 
return used;
}
 
EXPORT_SYMBOL(lapb_register);
EXPORT_SYMBOL(lapb_unregister);
EXPORT_SYMBOL(lapb_getparms);
EXPORT_SYMBOL(lapb_setparms);
EXPORT_SYMBOL(lapb_connect_request);
EXPORT_SYMBOL(lapb_disconnect_request);
EXPORT_SYMBOL(lapb_data_request);
EXPORT_SYMBOL(lapb_data_received);
 
static char banner[] __initdata = KERN_INFO "NET4: LAPB for Linux. Version 0.01 for NET4.0\n";
 
static int __init lapb_init(void)
{
printk(banner);
return 0;
}
 
MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The X.25 Link Access Procedure B link layer protocol");
MODULE_LICENSE("GPL");
 
module_init(lapb_init);
/lapb_subr.c
0,0 → 1,276
/*
* 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 Naylor Started Coding
*/
 
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.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 <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.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(lapb_cb *lapb)
{
skb_queue_purge(&lapb->write_queue);
skb_queue_purge(&lapb->ack_queue);
}
 
/*
* 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(lapb_cb *lapb, unsigned short nr)
{
struct sk_buff *skb;
int modulus;
 
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
/*
* Remove all the ack-ed frames from the ack queue.
*/
if (lapb->va != nr) {
while (skb_peek(&lapb->ack_queue) != NULL && lapb->va != nr) {
skb = skb_dequeue(&lapb->ack_queue);
kfree_skb(skb);
lapb->va = (lapb->va + 1) % modulus;
}
}
}
 
void lapb_requeue_frames(lapb_cb *lapb)
{
struct sk_buff *skb, *skb_prev = NULL;
 
/*
* Requeue all the un-ack-ed frames on the output queue to be picked
* up by lapb_kick called from the timer. This arrangement handles the
* possibility of an empty output queue.
*/
while ((skb = skb_dequeue(&lapb->ack_queue)) != NULL) {
if (skb_prev == NULL)
skb_queue_head(&lapb->write_queue, skb);
else
skb_append(skb_prev, skb);
skb_prev = skb;
}
}
 
/*
* Validate that the value of nr is between va and vs. Return true or
* false for testing.
*/
int lapb_validate_nr(lapb_cb *lapb, unsigned short nr)
{
unsigned short vc = lapb->va;
int modulus;
modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS : LAPB_SMODULUS;
 
while (vc != lapb->vs) {
if (nr == vc) return 1;
vc = (vc + 1) % modulus;
}
if (nr == lapb->vs) return 1;
 
return 0;
}
 
/*
* This routine is the centralised routine for parsing the control
* information for the different frame formats.
*/
void lapb_decode(lapb_cb *lapb, struct sk_buff *skb, struct lapb_frame *frame)
{
frame->type = LAPB_ILLEGAL;
 
#if LAPB_DEBUG > 2
printk(KERN_DEBUG "lapb: (%p) S%d RX %02X %02X %02X\n", lapb->token, lapb->state, skb->data[0], skb->data[1], skb->data[2]);
#endif
 
if (lapb->mode & LAPB_MLP) {
if (lapb->mode & LAPB_DCE) {
if (skb->data[0] == LAPB_ADDR_D)
frame->cr = LAPB_COMMAND;
if (skb->data[0] == LAPB_ADDR_C)
frame->cr = LAPB_RESPONSE;
} else {
if (skb->data[0] == LAPB_ADDR_C)
frame->cr = LAPB_COMMAND;
if (skb->data[0] == LAPB_ADDR_D)
frame->cr = LAPB_RESPONSE;
}
} else {
if (lapb->mode & LAPB_DCE) {
if (skb->data[0] == LAPB_ADDR_B)
frame->cr = LAPB_COMMAND;
if (skb->data[0] == LAPB_ADDR_A)
frame->cr = LAPB_RESPONSE;
} else {
if (skb->data[0] == LAPB_ADDR_A)
frame->cr = LAPB_COMMAND;
if (skb->data[0] == LAPB_ADDR_B)
frame->cr = LAPB_RESPONSE;
}
}
skb_pull(skb, 1);
 
if (lapb->mode & LAPB_EXTENDED) {
if ((skb->data[0] & LAPB_S) == 0) {
frame->type = LAPB_I; /* I frame - carries NR/NS/PF */
frame->ns = (skb->data[0] >> 1) & 0x7F;
frame->nr = (skb->data[1] >> 1) & 0x7F;
frame->pf = skb->data[1] & LAPB_EPF;
frame->control[0] = skb->data[0];
frame->control[1] = skb->data[1];
skb_pull(skb, 2);
} else if ((skb->data[0] & LAPB_U) == 1) { /* S frame - take out PF/NR */
frame->type = skb->data[0] & 0x0F;
frame->nr = (skb->data[1] >> 1) & 0x7F;
frame->pf = skb->data[1] & LAPB_EPF;
frame->control[0] = skb->data[0];
frame->control[1] = skb->data[1];
skb_pull(skb, 2);
} else if ((skb->data[0] & LAPB_U) == 3) { /* U frame - take out PF */
frame->type = skb->data[0] & ~LAPB_SPF;
frame->pf = skb->data[0] & LAPB_SPF;
frame->control[0] = skb->data[0];
frame->control[1] = 0x00;
skb_pull(skb, 1);
}
} else {
if ((skb->data[0] & LAPB_S) == 0) {
frame->type = LAPB_I; /* I frame - carries NR/NS/PF */
frame->ns = (skb->data[0] >> 1) & 0x07;
frame->nr = (skb->data[0] >> 5) & 0x07;
frame->pf = skb->data[0] & LAPB_SPF;
} else if ((skb->data[0] & LAPB_U) == 1) { /* S frame - take out PF/NR */
frame->type = skb->data[0] & 0x0F;
frame->nr = (skb->data[0] >> 5) & 0x07;
frame->pf = skb->data[0] & LAPB_SPF;
} else if ((skb->data[0] & LAPB_U) == 3) { /* U frame - take out PF */
frame->type = skb->data[0] & ~LAPB_SPF;
frame->pf = skb->data[0] & LAPB_SPF;
}
 
frame->control[0] = skb->data[0];
 
skb_pull(skb, 1);
}
}
 
/*
* 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(lapb_cb *lapb, int frametype, int poll_bit, int type)
{
struct sk_buff *skb;
unsigned char *dptr;
 
if ((skb = alloc_skb(LAPB_HEADER_LEN + 3, GFP_ATOMIC)) == NULL)
return;
 
skb_reserve(skb, LAPB_HEADER_LEN + 1);
 
if (lapb->mode & LAPB_EXTENDED) {
if ((frametype & LAPB_U) == LAPB_U) {
dptr = skb_put(skb, 1);
*dptr = frametype;
*dptr |= (poll_bit) ? LAPB_SPF : 0;
} else {
dptr = skb_put(skb, 2);
dptr[0] = frametype;
dptr[1] = (lapb->vr << 1);
dptr[1] |= (poll_bit) ? LAPB_EPF : 0;
}
} else {
dptr = skb_put(skb, 1);
*dptr = frametype;
*dptr |= (poll_bit) ? LAPB_SPF : 0;
if ((frametype & LAPB_U) == LAPB_S) /* S frames carry NR */
*dptr |= (lapb->vr << 5);
}
 
lapb_transmit_buffer(lapb, skb, type);
}
 
/*
* This routine generates FRMRs based on information previously stored in
* the LAPB control block.
*/
void lapb_transmit_frmr(lapb_cb *lapb)
{
struct sk_buff *skb;
unsigned char *dptr;
 
if ((skb = alloc_skb(LAPB_HEADER_LEN + 7, GFP_ATOMIC)) == NULL)
return;
 
skb_reserve(skb, LAPB_HEADER_LEN + 1);
 
if (lapb->mode & LAPB_EXTENDED) {
dptr = skb_put(skb, 6);
*dptr++ = LAPB_FRMR;
*dptr++ = lapb->frmr_data.control[0];
*dptr++ = lapb->frmr_data.control[1];
*dptr++ = (lapb->vs << 1) & 0xFE;
*dptr = (lapb->vr << 1) & 0xFE;
if (lapb->frmr_data.cr == LAPB_RESPONSE)
*dptr |= 0x01;
dptr++;
*dptr++ = lapb->frmr_type;
 
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X %02X %02X\n", lapb->token, lapb->state, skb->data[1], skb->data[2], skb->data[3], skb->data[4], skb->data[5]);
#endif
} else {
dptr = skb_put(skb, 4);
*dptr++ = LAPB_FRMR;
*dptr++ = lapb->frmr_data.control[0];
*dptr = (lapb->vs << 1) & 0x0E;
*dptr |= (lapb->vr << 5) & 0xE0;
if (lapb->frmr_data.cr == LAPB_RESPONSE)
*dptr |= 0x10;
dptr++;
*dptr++ = lapb->frmr_type;
 
#if LAPB_DEBUG > 1
printk(KERN_DEBUG "lapb: (%p) S%d TX FRMR %02X %02X %02X\n", lapb->token, lapb->state, skb->data[1], skb->data[2], skb->data[3]);
#endif
}
 
lapb_transmit_buffer(lapb, skb, LAPB_RESPONSE);
}
/Makefile
0,0 → 1,19
#
# Makefile for the Linux LAPB layer.
#
# Note! Dependencies are done automagically by 'make dep', which also
# removes any old dependencies. DON'T put your own dependencies here
# unless it's something special (ie not a .c file).
#
# Note 2! The CFLAGS definition is now in the main makefile...
 
 
O_TARGET := lapb.o
 
export-objs := lapb_iface.o
 
obj-y := lapb_in.o lapb_out.o lapb_subr.o lapb_timer.o lapb_iface.o
obj-m := $(O_TARGET)
 
include $(TOPDIR)/Rules.make
 

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