/*
|
/*
|
* NET/ROM release 007
|
* NET/ROM release 007
|
*
|
*
|
* This code REQUIRES 2.1.15 or higher/ NET3.038
|
* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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*
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* This module:
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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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* 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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* 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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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
|
* 2 of the License, or (at your option) any later version.
|
*
|
*
|
* History
|
* History
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* NET/ROM 001 Jonathan(G4KLX) Cloned from ax25_subr.c
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* NET/ROM 001 Jonathan(G4KLX) Cloned from ax25_subr.c
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* NET/ROM 003 Jonathan(G4KLX) Added G8BPQ NET/ROM extensions.
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* NET/ROM 003 Jonathan(G4KLX) Added G8BPQ NET/ROM extensions.
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* NET/ROM 007 Jonathan(G4KLX) New timer architecture.
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* NET/ROM 007 Jonathan(G4KLX) New timer architecture.
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*/
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*/
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|
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#include <linux/errno.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/system.h>
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#include <linux/fcntl.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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#include <net/netrom.h>
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#include <net/netrom.h>
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|
|
/*
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/*
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* This routine purges all of the queues of frames.
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* This routine purges all of the queues of frames.
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*/
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*/
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void nr_clear_queues(struct sock *sk)
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void nr_clear_queues(struct sock *sk)
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{
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{
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skb_queue_purge(&sk->write_queue);
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skb_queue_purge(&sk->write_queue);
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skb_queue_purge(&sk->protinfo.nr->ack_queue);
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skb_queue_purge(&sk->protinfo.nr->ack_queue);
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skb_queue_purge(&sk->protinfo.nr->reseq_queue);
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skb_queue_purge(&sk->protinfo.nr->reseq_queue);
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skb_queue_purge(&sk->protinfo.nr->frag_queue);
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skb_queue_purge(&sk->protinfo.nr->frag_queue);
|
}
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}
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|
|
/*
|
/*
|
* This routine purges the input queue of those frames that have been
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* This routine purges the input queue of those frames that have been
|
* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
|
* acknowledged. This replaces the boxes labelled "V(a) <- N(r)" on the
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* SDL diagram.
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* SDL diagram.
|
*/
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*/
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void nr_frames_acked(struct sock *sk, unsigned short nr)
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void nr_frames_acked(struct sock *sk, unsigned short nr)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
|
|
/*
|
/*
|
* Remove all the ack-ed frames from the ack queue.
|
* Remove all the ack-ed frames from the ack queue.
|
*/
|
*/
|
if (sk->protinfo.nr->va != nr) {
|
if (sk->protinfo.nr->va != nr) {
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while (skb_peek(&sk->protinfo.nr->ack_queue) != NULL && sk->protinfo.nr->va != nr) {
|
while (skb_peek(&sk->protinfo.nr->ack_queue) != NULL && sk->protinfo.nr->va != nr) {
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skb = skb_dequeue(&sk->protinfo.nr->ack_queue);
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skb = skb_dequeue(&sk->protinfo.nr->ack_queue);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
sk->protinfo.nr->va = (sk->protinfo.nr->va + 1) % NR_MODULUS;
|
sk->protinfo.nr->va = (sk->protinfo.nr->va + 1) % NR_MODULUS;
|
}
|
}
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* Requeue all the un-ack-ed frames on the output queue to be picked
|
* Requeue all the un-ack-ed frames on the output queue to be picked
|
* up by nr_kick called from the timer. This arrangement handles the
|
* up by nr_kick called from the timer. This arrangement handles the
|
* possibility of an empty output queue.
|
* possibility of an empty output queue.
|
*/
|
*/
|
void nr_requeue_frames(struct sock *sk)
|
void nr_requeue_frames(struct sock *sk)
|
{
|
{
|
struct sk_buff *skb, *skb_prev = NULL;
|
struct sk_buff *skb, *skb_prev = NULL;
|
|
|
while ((skb = skb_dequeue(&sk->protinfo.nr->ack_queue)) != NULL) {
|
while ((skb = skb_dequeue(&sk->protinfo.nr->ack_queue)) != NULL) {
|
if (skb_prev == NULL)
|
if (skb_prev == NULL)
|
skb_queue_head(&sk->write_queue, skb);
|
skb_queue_head(&sk->write_queue, skb);
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else
|
else
|
skb_append(skb_prev, skb);
|
skb_append(skb_prev, skb);
|
skb_prev = skb;
|
skb_prev = skb;
|
}
|
}
|
}
|
}
|
|
|
/*
|
/*
|
* Validate that the value of nr is between va and vs. Return true or
|
* Validate that the value of nr is between va and vs. Return true or
|
* false for testing.
|
* false for testing.
|
*/
|
*/
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int nr_validate_nr(struct sock *sk, unsigned short nr)
|
int nr_validate_nr(struct sock *sk, unsigned short nr)
|
{
|
{
|
unsigned short vc = sk->protinfo.nr->va;
|
unsigned short vc = sk->protinfo.nr->va;
|
|
|
while (vc != sk->protinfo.nr->vs) {
|
while (vc != sk->protinfo.nr->vs) {
|
if (nr == vc) return 1;
|
if (nr == vc) return 1;
|
vc = (vc + 1) % NR_MODULUS;
|
vc = (vc + 1) % NR_MODULUS;
|
}
|
}
|
|
|
if (nr == sk->protinfo.nr->vs) return 1;
|
if (nr == sk->protinfo.nr->vs) return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Check that ns is within the receive window.
|
* Check that ns is within the receive window.
|
*/
|
*/
|
int nr_in_rx_window(struct sock *sk, unsigned short ns)
|
int nr_in_rx_window(struct sock *sk, unsigned short ns)
|
{
|
{
|
unsigned short vc = sk->protinfo.nr->vr;
|
unsigned short vc = sk->protinfo.nr->vr;
|
unsigned short vt = (sk->protinfo.nr->vl + sk->protinfo.nr->window) % NR_MODULUS;
|
unsigned short vt = (sk->protinfo.nr->vl + sk->protinfo.nr->window) % NR_MODULUS;
|
|
|
while (vc != vt) {
|
while (vc != vt) {
|
if (ns == vc) return 1;
|
if (ns == vc) return 1;
|
vc = (vc + 1) % NR_MODULUS;
|
vc = (vc + 1) % NR_MODULUS;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* This routine is called when the HDLC layer internally generates a
|
* This routine is called when the HDLC layer internally generates a
|
* control frame.
|
* control frame.
|
*/
|
*/
|
void nr_write_internal(struct sock *sk, int frametype)
|
void nr_write_internal(struct sock *sk, int frametype)
|
{
|
{
|
struct sk_buff *skb;
|
struct sk_buff *skb;
|
unsigned char *dptr;
|
unsigned char *dptr;
|
int len, timeout;
|
int len, timeout;
|
|
|
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
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len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN + NR_TRANSPORT_LEN;
|
|
|
switch (frametype & 0x0F) {
|
switch (frametype & 0x0F) {
|
case NR_CONNREQ:
|
case NR_CONNREQ:
|
len += 17;
|
len += 17;
|
break;
|
break;
|
case NR_CONNACK:
|
case NR_CONNACK:
|
len += (sk->protinfo.nr->bpqext) ? 2 : 1;
|
len += (sk->protinfo.nr->bpqext) ? 2 : 1;
|
break;
|
break;
|
case NR_DISCREQ:
|
case NR_DISCREQ:
|
case NR_DISCACK:
|
case NR_DISCACK:
|
case NR_INFOACK:
|
case NR_INFOACK:
|
break;
|
break;
|
default:
|
default:
|
printk(KERN_ERR "NET/ROM: nr_write_internal - invalid frame type %d\n", frametype);
|
printk(KERN_ERR "NET/ROM: nr_write_internal - invalid frame type %d\n", frametype);
|
return;
|
return;
|
}
|
}
|
|
|
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
|
if ((skb = alloc_skb(len, GFP_ATOMIC)) == NULL)
|
return;
|
return;
|
|
|
/*
|
/*
|
* Space for AX.25 and NET/ROM network header
|
* Space for AX.25 and NET/ROM network header
|
*/
|
*/
|
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN);
|
skb_reserve(skb, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN);
|
|
|
dptr = skb_put(skb, skb_tailroom(skb));
|
dptr = skb_put(skb, skb_tailroom(skb));
|
|
|
switch (frametype & 0x0F) {
|
switch (frametype & 0x0F) {
|
|
|
case NR_CONNREQ:
|
case NR_CONNREQ:
|
timeout = sk->protinfo.nr->t1 / HZ;
|
timeout = sk->protinfo.nr->t1 / HZ;
|
*dptr++ = sk->protinfo.nr->my_index;
|
*dptr++ = sk->protinfo.nr->my_index;
|
*dptr++ = sk->protinfo.nr->my_id;
|
*dptr++ = sk->protinfo.nr->my_id;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = frametype;
|
*dptr++ = frametype;
|
*dptr++ = sk->protinfo.nr->window;
|
*dptr++ = sk->protinfo.nr->window;
|
memcpy(dptr, &sk->protinfo.nr->user_addr, AX25_ADDR_LEN);
|
memcpy(dptr, &sk->protinfo.nr->user_addr, AX25_ADDR_LEN);
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr += AX25_ADDR_LEN;
|
dptr += AX25_ADDR_LEN;
|
memcpy(dptr, &sk->protinfo.nr->source_addr, AX25_ADDR_LEN);
|
memcpy(dptr, &sk->protinfo.nr->source_addr, AX25_ADDR_LEN);
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr += AX25_ADDR_LEN;
|
dptr += AX25_ADDR_LEN;
|
*dptr++ = timeout % 256;
|
*dptr++ = timeout % 256;
|
*dptr++ = timeout / 256;
|
*dptr++ = timeout / 256;
|
break;
|
break;
|
|
|
case NR_CONNACK:
|
case NR_CONNACK:
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = sk->protinfo.nr->my_index;
|
*dptr++ = sk->protinfo.nr->my_index;
|
*dptr++ = sk->protinfo.nr->my_id;
|
*dptr++ = sk->protinfo.nr->my_id;
|
*dptr++ = frametype;
|
*dptr++ = frametype;
|
*dptr++ = sk->protinfo.nr->window;
|
*dptr++ = sk->protinfo.nr->window;
|
if (sk->protinfo.nr->bpqext) *dptr++ = sysctl_netrom_network_ttl_initialiser;
|
if (sk->protinfo.nr->bpqext) *dptr++ = sysctl_netrom_network_ttl_initialiser;
|
break;
|
break;
|
|
|
case NR_DISCREQ:
|
case NR_DISCREQ:
|
case NR_DISCACK:
|
case NR_DISCACK:
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = frametype;
|
*dptr++ = frametype;
|
break;
|
break;
|
|
|
case NR_INFOACK:
|
case NR_INFOACK:
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_index;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = sk->protinfo.nr->your_id;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = sk->protinfo.nr->vr;
|
*dptr++ = sk->protinfo.nr->vr;
|
*dptr++ = frametype;
|
*dptr++ = frametype;
|
break;
|
break;
|
}
|
}
|
|
|
nr_transmit_buffer(sk, skb);
|
nr_transmit_buffer(sk, skb);
|
}
|
}
|
|
|
/*
|
/*
|
* This routine is called when a Connect Acknowledge with the Choke Flag
|
* This routine is called when a Connect Acknowledge with the Choke Flag
|
* set is needed to refuse a connection.
|
* set is needed to refuse a connection.
|
*/
|
*/
|
void nr_transmit_refusal(struct sk_buff *skb, int mine)
|
void nr_transmit_refusal(struct sk_buff *skb, int mine)
|
{
|
{
|
struct sk_buff *skbn;
|
struct sk_buff *skbn;
|
unsigned char *dptr;
|
unsigned char *dptr;
|
int len;
|
int len;
|
|
|
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN + NR_TRANSPORT_LEN + 1;
|
len = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + NR_NETWORK_LEN + NR_TRANSPORT_LEN + 1;
|
|
|
if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL)
|
if ((skbn = alloc_skb(len, GFP_ATOMIC)) == NULL)
|
return;
|
return;
|
|
|
skb_reserve(skbn, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
|
skb_reserve(skbn, AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN);
|
|
|
dptr = skb_put(skbn, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
|
dptr = skb_put(skbn, NR_NETWORK_LEN + NR_TRANSPORT_LEN);
|
|
|
memcpy(dptr, skb->data + 7, AX25_ADDR_LEN);
|
memcpy(dptr, skb->data + 7, AX25_ADDR_LEN);
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] &= ~AX25_EBIT;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr += AX25_ADDR_LEN;
|
dptr += AX25_ADDR_LEN;
|
|
|
memcpy(dptr, skb->data + 0, AX25_ADDR_LEN);
|
memcpy(dptr, skb->data + 0, AX25_ADDR_LEN);
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] &= ~AX25_CBIT;
|
dptr[6] |= AX25_EBIT;
|
dptr[6] |= AX25_EBIT;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr[6] |= AX25_SSSID_SPARE;
|
dptr += AX25_ADDR_LEN;
|
dptr += AX25_ADDR_LEN;
|
|
|
*dptr++ = sysctl_netrom_network_ttl_initialiser;
|
*dptr++ = sysctl_netrom_network_ttl_initialiser;
|
|
|
if (mine) {
|
if (mine) {
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = skb->data[15];
|
*dptr++ = skb->data[15];
|
*dptr++ = skb->data[16];
|
*dptr++ = skb->data[16];
|
} else {
|
} else {
|
*dptr++ = skb->data[15];
|
*dptr++ = skb->data[15];
|
*dptr++ = skb->data[16];
|
*dptr++ = skb->data[16];
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
}
|
}
|
|
|
*dptr++ = NR_CONNACK | NR_CHOKE_FLAG;
|
*dptr++ = NR_CONNACK | NR_CHOKE_FLAG;
|
*dptr++ = 0;
|
*dptr++ = 0;
|
|
|
if (!nr_route_frame(skbn, NULL))
|
if (!nr_route_frame(skbn, NULL))
|
kfree_skb(skbn);
|
kfree_skb(skbn);
|
}
|
}
|
|
|
void nr_disconnect(struct sock *sk, int reason)
|
void nr_disconnect(struct sock *sk, int reason)
|
{
|
{
|
nr_stop_t1timer(sk);
|
nr_stop_t1timer(sk);
|
nr_stop_t2timer(sk);
|
nr_stop_t2timer(sk);
|
nr_stop_t4timer(sk);
|
nr_stop_t4timer(sk);
|
nr_stop_idletimer(sk);
|
nr_stop_idletimer(sk);
|
|
|
nr_clear_queues(sk);
|
nr_clear_queues(sk);
|
|
|
sk->protinfo.nr->state = NR_STATE_0;
|
sk->protinfo.nr->state = NR_STATE_0;
|
|
|
sk->state = TCP_CLOSE;
|
sk->state = TCP_CLOSE;
|
sk->err = reason;
|
sk->err = reason;
|
sk->shutdown |= SEND_SHUTDOWN;
|
sk->shutdown |= SEND_SHUTDOWN;
|
|
|
if (!sk->dead)
|
if (!sk->dead)
|
sk->state_change(sk);
|
sk->state_change(sk);
|
|
|
sk->dead = 1;
|
sk->dead = 1;
|
}
|
}
|
|
|
