mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![Joe Perches](/assets/img/avatar_default.png)
Enable dynamic debugging and remove a bunch of #ifdef/#endifs. Add a lapb_dbg(level, fmt, ...) macro and replace the printk(KERN_DEBUG uses. Add pr_fmt and remove embedded prefixes. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
211 lines
5 KiB
C
211 lines
5 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#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/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sock.h>
|
|
#include <asm/uaccess.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(struct lapb_cb *lapb, struct sk_buff *skb, int poll_bit)
|
|
{
|
|
unsigned char *frame;
|
|
|
|
if (!skb)
|
|
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;
|
|
}
|
|
|
|
lapb_dbg(1, "(%p) S%d TX I(%d) S%d R%d\n",
|
|
lapb->dev, lapb->state, poll_bit, lapb->vs, lapb->vr);
|
|
|
|
lapb_transmit_buffer(lapb, skb, LAPB_COMMAND);
|
|
}
|
|
|
|
void lapb_kick(struct 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) ? 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)) {
|
|
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)
|
|
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(struct 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;
|
|
}
|
|
}
|
|
|
|
lapb_dbg(2, "(%p) S%d TX %02X %02X %02X\n",
|
|
lapb->dev, lapb->state,
|
|
skb->data[0], skb->data[1], skb->data[2]);
|
|
|
|
if (!lapb_data_transmit(lapb, skb))
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
void lapb_establish_data_link(struct lapb_cb *lapb)
|
|
{
|
|
lapb->condition = 0x00;
|
|
lapb->n2count = 0;
|
|
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S%d TX SABME(1)\n", lapb->dev, lapb->state);
|
|
lapb_send_control(lapb, LAPB_SABME, LAPB_POLLON, LAPB_COMMAND);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S%d TX SABM(1)\n", lapb->dev, lapb->state);
|
|
lapb_send_control(lapb, LAPB_SABM, LAPB_POLLON, LAPB_COMMAND);
|
|
}
|
|
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
}
|
|
|
|
void lapb_enquiry_response(struct lapb_cb *lapb)
|
|
{
|
|
lapb_dbg(1, "(%p) S%d TX RR(1) R%d\n",
|
|
lapb->dev, lapb->state, lapb->vr);
|
|
|
|
lapb_send_control(lapb, LAPB_RR, LAPB_POLLON, LAPB_RESPONSE);
|
|
|
|
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
|
|
}
|
|
|
|
void lapb_timeout_response(struct lapb_cb *lapb)
|
|
{
|
|
lapb_dbg(1, "(%p) S%d TX RR(0) R%d\n",
|
|
lapb->dev, lapb->state, lapb->vr);
|
|
lapb_send_control(lapb, LAPB_RR, LAPB_POLLOFF, LAPB_RESPONSE);
|
|
|
|
lapb->condition &= ~LAPB_ACK_PENDING_CONDITION;
|
|
}
|
|
|
|
void lapb_check_iframes_acked(struct 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(struct lapb_cb *lapb, int type, int pf)
|
|
{
|
|
if (type == LAPB_COMMAND && pf)
|
|
lapb_enquiry_response(lapb);
|
|
}
|