mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +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>
562 lines
15 KiB
C
562 lines
15 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 Naulor Started Coding
|
|
* LAPB 002 Jonathan Naylor New timer architecture.
|
|
* 2000-10-29 Henner Eisen lapb_data_indication() return status.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/in.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/string.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/net.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sock.h>
|
|
#include <asm/uaccess.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <net/lapb.h>
|
|
|
|
/*
|
|
* State machine for state 0, Disconnected State.
|
|
* The handling of the timer(s) is in file lapb_timer.c.
|
|
*/
|
|
static void lapb_state0_machine(struct lapb_cb *lapb, struct sk_buff *skb,
|
|
struct lapb_frame *frame)
|
|
{
|
|
switch (frame->type) {
|
|
case LAPB_SABM:
|
|
lapb_dbg(1, "(%p) S0 RX SABM(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S0 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S0 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
lapb_stop_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_3;
|
|
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:
|
|
lapb_dbg(1, "(%p) S0 RX SABME(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S0 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S0 -> S3\n", lapb->dev);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
lapb_stop_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_3;
|
|
lapb->condition = 0x00;
|
|
lapb->n2count = 0;
|
|
lapb->vs = 0;
|
|
lapb->vr = 0;
|
|
lapb->va = 0;
|
|
lapb_connect_indication(lapb, LAPB_OK);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S0 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
}
|
|
break;
|
|
|
|
case LAPB_DISC:
|
|
lapb_dbg(1, "(%p) S0 RX DISC(%d)\n", lapb->dev, frame->pf);
|
|
lapb_dbg(1, "(%p) S0 TX UA(%d)\n", lapb->dev, frame->pf);
|
|
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(struct lapb_cb *lapb, struct sk_buff *skb,
|
|
struct lapb_frame *frame)
|
|
{
|
|
switch (frame->type) {
|
|
case LAPB_SABM:
|
|
lapb_dbg(1, "(%p) S1 RX SABM(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S1 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S1 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
}
|
|
break;
|
|
|
|
case LAPB_SABME:
|
|
lapb_dbg(1, "(%p) S1 RX SABME(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S1 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S1 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
}
|
|
break;
|
|
|
|
case LAPB_DISC:
|
|
lapb_dbg(1, "(%p) S1 RX DISC(%d)\n", lapb->dev, frame->pf);
|
|
lapb_dbg(1, "(%p) S1 TX DM(%d)\n", lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
|
break;
|
|
|
|
case LAPB_UA:
|
|
lapb_dbg(1, "(%p) S1 RX UA(%d)\n", lapb->dev, frame->pf);
|
|
if (frame->pf) {
|
|
lapb_dbg(0, "(%p) S1 -> S3\n", lapb->dev);
|
|
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:
|
|
lapb_dbg(1, "(%p) S1 RX DM(%d)\n", lapb->dev, frame->pf);
|
|
if (frame->pf) {
|
|
lapb_dbg(0, "(%p) S1 -> S0\n", lapb->dev);
|
|
lapb_clear_queues(lapb);
|
|
lapb->state = LAPB_STATE_0;
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb_disconnect_indication(lapb, LAPB_REFUSED);
|
|
}
|
|
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(struct lapb_cb *lapb, struct sk_buff *skb,
|
|
struct lapb_frame *frame)
|
|
{
|
|
switch (frame->type) {
|
|
case LAPB_SABM:
|
|
case LAPB_SABME:
|
|
lapb_dbg(1, "(%p) S2 RX {SABM,SABME}(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(1, "(%p) S2 TX DM(%d)\n", lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf, LAPB_RESPONSE);
|
|
break;
|
|
|
|
case LAPB_DISC:
|
|
lapb_dbg(1, "(%p) S2 RX DISC(%d)\n", lapb->dev, frame->pf);
|
|
lapb_dbg(1, "(%p) S2 TX UA(%d)\n", lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf, LAPB_RESPONSE);
|
|
break;
|
|
|
|
case LAPB_UA:
|
|
lapb_dbg(1, "(%p) S2 RX UA(%d)\n", lapb->dev, frame->pf);
|
|
if (frame->pf) {
|
|
lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
|
|
lapb->state = LAPB_STATE_0;
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb_disconnect_confirmation(lapb, LAPB_OK);
|
|
}
|
|
break;
|
|
|
|
case LAPB_DM:
|
|
lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf);
|
|
if (frame->pf) {
|
|
lapb_dbg(0, "(%p) S2 -> S0\n", lapb->dev);
|
|
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:
|
|
lapb_dbg(1, "(%p) S2 RX {I,REJ,RNR,RR}(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(1, "(%p) S2 RX DM(%d)\n", lapb->dev, frame->pf);
|
|
if (frame->pf)
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
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(struct lapb_cb *lapb, struct sk_buff *skb,
|
|
struct lapb_frame *frame)
|
|
{
|
|
int queued = 0;
|
|
int modulus = (lapb->mode & LAPB_EXTENDED) ? LAPB_EMODULUS :
|
|
LAPB_SMODULUS;
|
|
|
|
switch (frame->type) {
|
|
case LAPB_SABM:
|
|
lapb_dbg(1, "(%p) S3 RX SABM(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S3 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S3 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
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:
|
|
lapb_dbg(1, "(%p) S3 RX SABME(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S3 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
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 {
|
|
lapb_dbg(1, "(%p) S3 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
}
|
|
break;
|
|
|
|
case LAPB_DISC:
|
|
lapb_dbg(1, "(%p) S3 RX DISC(%d)\n", lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
|
|
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:
|
|
lapb_dbg(1, "(%p) S3 RX DM(%d)\n", lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S3 -> S0\n", lapb->dev);
|
|
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:
|
|
lapb_dbg(1, "(%p) S3 RX RNR(%d) R%d\n",
|
|
lapb->dev, frame->pf, frame->nr);
|
|
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);
|
|
lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev);
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_4;
|
|
lapb->n2count = 0;
|
|
}
|
|
break;
|
|
|
|
case LAPB_RR:
|
|
lapb_dbg(1, "(%p) S3 RX RR(%d) R%d\n",
|
|
lapb->dev, frame->pf, frame->nr);
|
|
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);
|
|
lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev);
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_4;
|
|
lapb->n2count = 0;
|
|
}
|
|
break;
|
|
|
|
case LAPB_REJ:
|
|
lapb_dbg(1, "(%p) S3 RX REJ(%d) R%d\n",
|
|
lapb->dev, frame->pf, frame->nr);
|
|
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);
|
|
lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev);
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_4;
|
|
lapb->n2count = 0;
|
|
}
|
|
break;
|
|
|
|
case LAPB_I:
|
|
lapb_dbg(1, "(%p) S3 RX I(%d) S%d R%d\n",
|
|
lapb->dev, frame->pf, frame->ns, frame->nr);
|
|
if (!lapb_validate_nr(lapb, frame->nr)) {
|
|
lapb->frmr_data = *frame;
|
|
lapb->frmr_type = LAPB_FRMR_Z;
|
|
lapb_transmit_frmr(lapb);
|
|
lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev);
|
|
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) {
|
|
pr_debug("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 {
|
|
lapb_dbg(1, "(%p) S3 TX REJ(%d) R%d\n",
|
|
lapb->dev, frame->pf, lapb->vr);
|
|
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:
|
|
lapb_dbg(1, "(%p) S3 RX FRMR(%d) %02X %02X %02X %02X %02X\n",
|
|
lapb->dev, frame->pf,
|
|
skb->data[0], skb->data[1], skb->data[2],
|
|
skb->data[3], skb->data[4]);
|
|
lapb_establish_data_link(lapb);
|
|
lapb_dbg(0, "(%p) S3 -> S1\n", lapb->dev);
|
|
lapb_requeue_frames(lapb);
|
|
lapb->state = LAPB_STATE_1;
|
|
break;
|
|
|
|
case LAPB_ILLEGAL:
|
|
lapb_dbg(1, "(%p) S3 RX ILLEGAL(%d)\n", lapb->dev, frame->pf);
|
|
lapb->frmr_data = *frame;
|
|
lapb->frmr_type = LAPB_FRMR_W;
|
|
lapb_transmit_frmr(lapb);
|
|
lapb_dbg(0, "(%p) S3 -> S4\n", lapb->dev);
|
|
lapb_start_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_4;
|
|
lapb->n2count = 0;
|
|
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(struct lapb_cb *lapb, struct sk_buff *skb,
|
|
struct lapb_frame *frame)
|
|
{
|
|
switch (frame->type) {
|
|
case LAPB_SABM:
|
|
lapb_dbg(1, "(%p) S4 RX SABM(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S4 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S4 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
lapb_stop_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_3;
|
|
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:
|
|
lapb_dbg(1, "(%p) S4 RX SABME(%d)\n", lapb->dev, frame->pf);
|
|
if (lapb->mode & LAPB_EXTENDED) {
|
|
lapb_dbg(1, "(%p) S4 TX UA(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_dbg(0, "(%p) S4 -> S3\n", lapb->dev);
|
|
lapb_send_control(lapb, LAPB_UA, frame->pf,
|
|
LAPB_RESPONSE);
|
|
lapb_stop_t1timer(lapb);
|
|
lapb_stop_t2timer(lapb);
|
|
lapb->state = LAPB_STATE_3;
|
|
lapb->condition = 0x00;
|
|
lapb->n2count = 0;
|
|
lapb->vs = 0;
|
|
lapb->vr = 0;
|
|
lapb->va = 0;
|
|
lapb_connect_indication(lapb, LAPB_OK);
|
|
} else {
|
|
lapb_dbg(1, "(%p) S4 TX DM(%d)\n",
|
|
lapb->dev, frame->pf);
|
|
lapb_send_control(lapb, LAPB_DM, frame->pf,
|
|
LAPB_RESPONSE);
|
|
}
|
|
break;
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/*
|
|
* Process an incoming LAPB frame
|
|
*/
|
|
void lapb_data_input(struct lapb_cb *lapb, struct sk_buff *skb)
|
|
{
|
|
struct lapb_frame frame;
|
|
|
|
if (lapb_decode(lapb, skb, &frame) < 0) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
|
|
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);
|
|
}
|