/*
|
/*
|
* AX.25 release 037
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* AX.25 release 037
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*
|
*
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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*
|
* This module:
|
* 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
|
* modify it under the terms of the GNU General Public License
|
* modify it under the terms of the GNU General Public License
|
* 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.
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* 2 of the License, or (at your option) any later version.
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*
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*
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* Most of this code is based on the SDL diagrams published in the 7th
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* Most of this code is based on the SDL diagrams published in the 7th
|
* ARRL Computer Networking Conference papers. The diagrams have mistakes
|
* ARRL Computer Networking Conference papers. The diagrams have mistakes
|
* in them, but are mostly correct. Before you modify the code could you
|
* in them, but are mostly correct. Before you modify the code could you
|
* read the SDL diagrams as the code is not obvious and probably very
|
* read the SDL diagrams as the code is not obvious and probably very
|
* easy to break;
|
* easy to break;
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*
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*
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* History
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* History
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* AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams.
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* AX.25 028a Jonathan(G4KLX) New state machine based on SDL diagrams.
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* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from
|
* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from
|
* the sock structure.
|
* the sock structure.
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* AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names.
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* AX.25 029 Alan(GW4PTS) Switched to KA9Q constant names.
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* Jonathan(G4KLX) Added IP mode registration.
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* Jonathan(G4KLX) Added IP mode registration.
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* AX.25 030 Jonathan(G4KLX) Added AX.25 fragment reception.
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* AX.25 030 Jonathan(G4KLX) Added AX.25 fragment reception.
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* Upgraded state machine for SABME.
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* Upgraded state machine for SABME.
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* Added arbitrary protocol id support.
|
* Added arbitrary protocol id support.
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* AX.25 031 Joerg(DL1BKE) Added DAMA support
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* AX.25 031 Joerg(DL1BKE) Added DAMA support
|
* HaJo(DD8NE) Added Idle Disc Timer T5
|
* HaJo(DD8NE) Added Idle Disc Timer T5
|
* Joerg(DL1BKE) Renamed it to "IDLE" with a slightly
|
* Joerg(DL1BKE) Renamed it to "IDLE" with a slightly
|
* different behaviour. Fixed defrag
|
* different behaviour. Fixed defrag
|
* routine (I hope)
|
* routine (I hope)
|
* AX.25 032 Darryl(G7LED) AX.25 segmentation fixed.
|
* AX.25 032 Darryl(G7LED) AX.25 segmentation fixed.
|
* AX.25 033 Jonathan(G4KLX) Remove auto-router.
|
* AX.25 033 Jonathan(G4KLX) Remove auto-router.
|
* Modularisation changes.
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* Modularisation changes.
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* AX.25 035 Hans(PE1AYX) Fixed interface to IP layer.
|
* AX.25 035 Hans(PE1AYX) Fixed interface to IP layer.
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* AX.25 036 Jonathan(G4KLX) Move DAMA code into own file.
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* AX.25 036 Jonathan(G4KLX) Move DAMA code into own file.
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* Joerg(DL1BKE) Fixed DAMA Slave.
|
* Joerg(DL1BKE) Fixed DAMA Slave.
|
* AX.25 037 Jonathan(G4KLX) New timer architecture.
|
* AX.25 037 Jonathan(G4KLX) New timer architecture.
|
* Thomas(DL9SAU) Fixed missing initialization of skb->protocol.
|
* Thomas(DL9SAU) Fixed missing initialization of skb->protocol.
|
*/
|
*/
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|
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#include <linux/config.h>
|
#include <linux/config.h>
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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 <linux/netfilter.h>
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#include <linux/netfilter.h>
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#include <net/sock.h>
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#include <net/sock.h>
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#include <net/ip.h> /* For ip_rcv */
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#include <net/ip.h> /* For ip_rcv */
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#include <net/arp.h> /* For arp_rcv */
|
#include <net/arp.h> /* For arp_rcv */
|
#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>
|
#include <linux/mm.h>
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#include <linux/mm.h>
|
#include <linux/interrupt.h>
|
#include <linux/interrupt.h>
|
|
|
/*
|
/*
|
* Given a fragment, queue it on the fragment queue and if the fragment
|
* Given a fragment, queue it on the fragment queue and if the fragment
|
* is complete, send it back to ax25_rx_iframe.
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* is complete, send it back to ax25_rx_iframe.
|
*/
|
*/
|
static int ax25_rx_fragment(ax25_cb *ax25, struct sk_buff *skb)
|
static int ax25_rx_fragment(ax25_cb *ax25, struct sk_buff *skb)
|
{
|
{
|
struct sk_buff *skbn, *skbo;
|
struct sk_buff *skbn, *skbo;
|
|
|
if (ax25->fragno != 0) {
|
if (ax25->fragno != 0) {
|
if (!(*skb->data & AX25_SEG_FIRST)) {
|
if (!(*skb->data & AX25_SEG_FIRST)) {
|
if ((ax25->fragno - 1) == (*skb->data & AX25_SEG_REM)) {
|
if ((ax25->fragno - 1) == (*skb->data & AX25_SEG_REM)) {
|
/* Enqueue fragment */
|
/* Enqueue fragment */
|
ax25->fragno = *skb->data & AX25_SEG_REM;
|
ax25->fragno = *skb->data & AX25_SEG_REM;
|
skb_pull(skb, 1); /* skip fragno */
|
skb_pull(skb, 1); /* skip fragno */
|
ax25->fraglen += skb->len;
|
ax25->fraglen += skb->len;
|
skb_queue_tail(&ax25->frag_queue, skb);
|
skb_queue_tail(&ax25->frag_queue, skb);
|
|
|
/* Last fragment received ? */
|
/* Last fragment received ? */
|
if (ax25->fragno == 0) {
|
if (ax25->fragno == 0) {
|
skbn = alloc_skb(AX25_MAX_HEADER_LEN +
|
skbn = alloc_skb(AX25_MAX_HEADER_LEN +
|
ax25->fraglen,
|
ax25->fraglen,
|
GFP_ATOMIC);
|
GFP_ATOMIC);
|
if (!skbn) {
|
if (!skbn) {
|
skb_queue_purge(&ax25->frag_queue);
|
skb_queue_purge(&ax25->frag_queue);
|
return 1;
|
return 1;
|
}
|
}
|
|
|
skb_reserve(skbn, AX25_MAX_HEADER_LEN);
|
skb_reserve(skbn, AX25_MAX_HEADER_LEN);
|
|
|
skbn->dev = ax25->ax25_dev->dev;
|
skbn->dev = ax25->ax25_dev->dev;
|
skbn->h.raw = skbn->data;
|
skbn->h.raw = skbn->data;
|
skbn->nh.raw = skbn->data;
|
skbn->nh.raw = skbn->data;
|
|
|
/* Copy data from the fragments */
|
/* Copy data from the fragments */
|
while ((skbo = skb_dequeue(&ax25->frag_queue)) != NULL) {
|
while ((skbo = skb_dequeue(&ax25->frag_queue)) != NULL) {
|
memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
|
memcpy(skb_put(skbn, skbo->len), skbo->data, skbo->len);
|
kfree_skb(skbo);
|
kfree_skb(skbo);
|
}
|
}
|
|
|
ax25->fraglen = 0;
|
ax25->fraglen = 0;
|
|
|
if (ax25_rx_iframe(ax25, skbn) == 0)
|
if (ax25_rx_iframe(ax25, skbn) == 0)
|
kfree_skb(skbn);
|
kfree_skb(skbn);
|
}
|
}
|
|
|
return 1;
|
return 1;
|
}
|
}
|
}
|
}
|
} else {
|
} else {
|
/* First fragment received */
|
/* First fragment received */
|
if (*skb->data & AX25_SEG_FIRST) {
|
if (*skb->data & AX25_SEG_FIRST) {
|
skb_queue_purge(&ax25->frag_queue);
|
skb_queue_purge(&ax25->frag_queue);
|
ax25->fragno = *skb->data & AX25_SEG_REM;
|
ax25->fragno = *skb->data & AX25_SEG_REM;
|
skb_pull(skb, 1); /* skip fragno */
|
skb_pull(skb, 1); /* skip fragno */
|
ax25->fraglen = skb->len;
|
ax25->fraglen = skb->len;
|
skb_queue_tail(&ax25->frag_queue, skb);
|
skb_queue_tail(&ax25->frag_queue, skb);
|
return 1;
|
return 1;
|
}
|
}
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* This is where all valid I frames are sent to, to be dispatched to
|
* This is where all valid I frames are sent to, to be dispatched to
|
* whichever protocol requires them.
|
* whichever protocol requires them.
|
*/
|
*/
|
int ax25_rx_iframe(ax25_cb *ax25, struct sk_buff *skb)
|
int ax25_rx_iframe(ax25_cb *ax25, struct sk_buff *skb)
|
{
|
{
|
int (*func)(struct sk_buff *, ax25_cb *);
|
int (*func)(struct sk_buff *, ax25_cb *);
|
volatile int queued = 0;
|
volatile int queued = 0;
|
unsigned char pid;
|
unsigned char pid;
|
|
|
if (skb == NULL) return 0;
|
if (skb == NULL) return 0;
|
|
|
ax25_start_idletimer(ax25);
|
ax25_start_idletimer(ax25);
|
|
|
pid = *skb->data;
|
pid = *skb->data;
|
|
|
#ifdef CONFIG_INET
|
#ifdef CONFIG_INET
|
if (pid == AX25_P_IP) {
|
if (pid == AX25_P_IP) {
|
/* working around a TCP bug to keep additional listeners
|
/* working around a TCP bug to keep additional listeners
|
* happy. TCP re-uses the buffer and destroys the original
|
* happy. TCP re-uses the buffer and destroys the original
|
* content.
|
* content.
|
*/
|
*/
|
struct sk_buff *skbn = skb_copy(skb, GFP_ATOMIC);
|
struct sk_buff *skbn = skb_copy(skb, GFP_ATOMIC);
|
if (skbn != NULL) {
|
if (skbn != NULL) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
skb = skbn;
|
skb = skbn;
|
}
|
}
|
|
|
skb_pull(skb, 1); /* Remove PID */
|
skb_pull(skb, 1); /* Remove PID */
|
skb->h.raw = skb->data;
|
skb->h.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->dev = ax25->ax25_dev->dev;
|
skb->dev = ax25->ax25_dev->dev;
|
skb->pkt_type = PACKET_HOST;
|
skb->pkt_type = PACKET_HOST;
|
skb->protocol = htons(ETH_P_IP);
|
skb->protocol = htons(ETH_P_IP);
|
ip_rcv(skb, skb->dev, NULL); /* Wrong ptype */
|
ip_rcv(skb, skb->dev, NULL); /* Wrong ptype */
|
return 1;
|
return 1;
|
}
|
}
|
#endif
|
#endif
|
if (pid == AX25_P_SEGMENT) {
|
if (pid == AX25_P_SEGMENT) {
|
skb_pull(skb, 1); /* Remove PID */
|
skb_pull(skb, 1); /* Remove PID */
|
return ax25_rx_fragment(ax25, skb);
|
return ax25_rx_fragment(ax25, skb);
|
}
|
}
|
|
|
if ((func = ax25_protocol_function(pid)) != NULL) {
|
if ((func = ax25_protocol_function(pid)) != NULL) {
|
skb_pull(skb, 1); /* Remove PID */
|
skb_pull(skb, 1); /* Remove PID */
|
return (*func)(skb, ax25);
|
return (*func)(skb, ax25);
|
}
|
}
|
|
|
if (ax25->sk != NULL && ax25->ax25_dev->values[AX25_VALUES_CONMODE] == 2) {
|
if (ax25->sk != NULL && ax25->ax25_dev->values[AX25_VALUES_CONMODE] == 2) {
|
if ((!ax25->pidincl && ax25->sk->protocol == pid) || ax25->pidincl) {
|
if ((!ax25->pidincl && ax25->sk->protocol == pid) || ax25->pidincl) {
|
if (sock_queue_rcv_skb(ax25->sk, skb) == 0)
|
if (sock_queue_rcv_skb(ax25->sk, skb) == 0)
|
queued = 1;
|
queued = 1;
|
else
|
else
|
ax25->condition |= AX25_COND_OWN_RX_BUSY;
|
ax25->condition |= AX25_COND_OWN_RX_BUSY;
|
}
|
}
|
}
|
}
|
|
|
return queued;
|
return queued;
|
}
|
}
|
|
|
/*
|
/*
|
* Higher level upcall for a LAPB frame
|
* Higher level upcall for a LAPB frame
|
*/
|
*/
|
static int ax25_process_rx_frame(ax25_cb *ax25, struct sk_buff *skb, int type, int dama)
|
static int ax25_process_rx_frame(ax25_cb *ax25, struct sk_buff *skb, int type, int dama)
|
{
|
{
|
int queued = 0;
|
int queued = 0;
|
|
|
if (ax25->state == AX25_STATE_0)
|
if (ax25->state == AX25_STATE_0)
|
return 0;
|
return 0;
|
|
|
switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
|
switch (ax25->ax25_dev->values[AX25_VALUES_PROTOCOL]) {
|
case AX25_PROTO_STD_SIMPLEX:
|
case AX25_PROTO_STD_SIMPLEX:
|
case AX25_PROTO_STD_DUPLEX:
|
case AX25_PROTO_STD_DUPLEX:
|
queued = ax25_std_frame_in(ax25, skb, type);
|
queued = ax25_std_frame_in(ax25, skb, type);
|
break;
|
break;
|
|
|
#ifdef CONFIG_AX25_DAMA_SLAVE
|
#ifdef CONFIG_AX25_DAMA_SLAVE
|
case AX25_PROTO_DAMA_SLAVE:
|
case AX25_PROTO_DAMA_SLAVE:
|
if (dama || ax25->ax25_dev->dama.slave)
|
if (dama || ax25->ax25_dev->dama.slave)
|
queued = ax25_ds_frame_in(ax25, skb, type);
|
queued = ax25_ds_frame_in(ax25, skb, type);
|
else
|
else
|
queued = ax25_std_frame_in(ax25, skb, type);
|
queued = ax25_std_frame_in(ax25, skb, type);
|
break;
|
break;
|
#endif
|
#endif
|
}
|
}
|
|
|
return queued;
|
return queued;
|
}
|
}
|
|
|
static int ax25_rcv(struct sk_buff *skb, struct net_device *dev, ax25_address *dev_addr, struct packet_type *ptype)
|
static int ax25_rcv(struct sk_buff *skb, struct net_device *dev, ax25_address *dev_addr, struct packet_type *ptype)
|
{
|
{
|
struct sock *make;
|
struct sock *make;
|
struct sock *sk;
|
struct sock *sk;
|
int type = 0;
|
int type = 0;
|
ax25_digi dp, reverse_dp;
|
ax25_digi dp, reverse_dp;
|
ax25_cb *ax25;
|
ax25_cb *ax25;
|
ax25_address src, dest;
|
ax25_address src, dest;
|
ax25_address *next_digi = NULL;
|
ax25_address *next_digi = NULL;
|
ax25_dev *ax25_dev;
|
ax25_dev *ax25_dev;
|
struct sock *raw;
|
struct sock *raw;
|
int mine = 0;
|
int mine = 0;
|
int dama;
|
int dama;
|
|
|
/*
|
/*
|
* Process the AX.25/LAPB frame.
|
* Process the AX.25/LAPB frame.
|
*/
|
*/
|
|
|
skb->h.raw = skb->data;
|
skb->h.raw = skb->data;
|
|
|
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {
|
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Parse the address header.
|
* Parse the address header.
|
*/
|
*/
|
|
|
if (ax25_addr_parse(skb->data, skb->len, &src, &dest, &dp, &type, &dama) == NULL) {
|
if (ax25_addr_parse(skb->data, skb->len, &src, &dest, &dp, &type, &dama) == NULL) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Ours perhaps ?
|
* Ours perhaps ?
|
*/
|
*/
|
if (dp.lastrepeat + 1 < dp.ndigi) /* Not yet digipeated completely */
|
if (dp.lastrepeat + 1 < dp.ndigi) /* Not yet digipeated completely */
|
next_digi = &dp.calls[dp.lastrepeat + 1];
|
next_digi = &dp.calls[dp.lastrepeat + 1];
|
|
|
/*
|
/*
|
* Pull of the AX.25 headers leaving the CTRL/PID bytes
|
* Pull of the AX.25 headers leaving the CTRL/PID bytes
|
*/
|
*/
|
skb_pull(skb, ax25_addr_size(&dp));
|
skb_pull(skb, ax25_addr_size(&dp));
|
|
|
/* For our port addresses ? */
|
/* For our port addresses ? */
|
if (ax25cmp(&dest, dev_addr) == 0 && dp.lastrepeat + 1 == dp.ndigi)
|
if (ax25cmp(&dest, dev_addr) == 0 && dp.lastrepeat + 1 == dp.ndigi)
|
mine = 1;
|
mine = 1;
|
|
|
/* Also match on any registered callsign from L3/4 */
|
/* Also match on any registered callsign from L3/4 */
|
if (!mine && ax25_listen_mine(&dest, dev) && dp.lastrepeat + 1 == dp.ndigi)
|
if (!mine && ax25_listen_mine(&dest, dev) && dp.lastrepeat + 1 == dp.ndigi)
|
mine = 1;
|
mine = 1;
|
|
|
/* UI frame - bypass LAPB processing */
|
/* UI frame - bypass LAPB processing */
|
if ((*skb->data & ~0x10) == AX25_UI && dp.lastrepeat + 1 == dp.ndigi) {
|
if ((*skb->data & ~0x10) == AX25_UI && dp.lastrepeat + 1 == dp.ndigi) {
|
skb->h.raw = skb->data + 2; /* skip control and pid */
|
skb->h.raw = skb->data + 2; /* skip control and pid */
|
|
|
if ((raw = ax25_addr_match(&dest)) != NULL)
|
if ((raw = ax25_addr_match(&dest)) != NULL)
|
ax25_send_to_raw(raw, skb, skb->data[1]);
|
ax25_send_to_raw(raw, skb, skb->data[1]);
|
|
|
if (!mine && ax25cmp(&dest, (ax25_address *)dev->broadcast) != 0) {
|
if (!mine && ax25cmp(&dest, (ax25_address *)dev->broadcast) != 0) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* Now we are pointing at the pid byte */
|
/* Now we are pointing at the pid byte */
|
switch (skb->data[1]) {
|
switch (skb->data[1]) {
|
#ifdef CONFIG_INET
|
#ifdef CONFIG_INET
|
case AX25_P_IP:
|
case AX25_P_IP:
|
skb_pull(skb,2); /* drop PID/CTRL */
|
skb_pull(skb,2); /* drop PID/CTRL */
|
skb->h.raw = skb->data;
|
skb->h.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->dev = dev;
|
skb->dev = dev;
|
skb->pkt_type = PACKET_HOST;
|
skb->pkt_type = PACKET_HOST;
|
skb->protocol = htons(ETH_P_IP);
|
skb->protocol = htons(ETH_P_IP);
|
ip_rcv(skb, dev, ptype); /* Note ptype here is the wrong one, fix me later */
|
ip_rcv(skb, dev, ptype); /* Note ptype here is the wrong one, fix me later */
|
break;
|
break;
|
|
|
case AX25_P_ARP:
|
case AX25_P_ARP:
|
skb_pull(skb,2);
|
skb_pull(skb,2);
|
skb->h.raw = skb->data;
|
skb->h.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->nh.raw = skb->data;
|
skb->dev = dev;
|
skb->dev = dev;
|
skb->pkt_type = PACKET_HOST;
|
skb->pkt_type = PACKET_HOST;
|
skb->protocol = htons(ETH_P_ARP);
|
skb->protocol = htons(ETH_P_ARP);
|
arp_rcv(skb, dev, ptype); /* Note ptype here is wrong... */
|
arp_rcv(skb, dev, ptype); /* Note ptype here is wrong... */
|
break;
|
break;
|
#endif
|
#endif
|
case AX25_P_TEXT:
|
case AX25_P_TEXT:
|
/* Now find a suitable dgram socket */
|
/* Now find a suitable dgram socket */
|
if ((sk = ax25_find_socket(&dest, &src, SOCK_DGRAM)) != NULL) {
|
if ((sk = ax25_find_socket(&dest, &src, SOCK_DGRAM)) != NULL) {
|
if (atomic_read(&sk->rmem_alloc) >= sk->rcvbuf) {
|
if (atomic_read(&sk->rmem_alloc) >= sk->rcvbuf) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
} else {
|
} else {
|
/*
|
/*
|
* Remove the control and PID.
|
* Remove the control and PID.
|
*/
|
*/
|
skb_pull(skb, 2);
|
skb_pull(skb, 2);
|
if (sock_queue_rcv_skb(sk, skb) != 0)
|
if (sock_queue_rcv_skb(sk, skb) != 0)
|
kfree_skb(skb);
|
kfree_skb(skb);
|
}
|
}
|
} else {
|
} else {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
}
|
}
|
break;
|
break;
|
|
|
default:
|
default:
|
kfree_skb(skb); /* Will scan SOCK_AX25 RAW sockets */
|
kfree_skb(skb); /* Will scan SOCK_AX25 RAW sockets */
|
break;
|
break;
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Is connected mode supported on this device ?
|
* Is connected mode supported on this device ?
|
* If not, should we DM the incoming frame (except DMs) or
|
* If not, should we DM the incoming frame (except DMs) or
|
* silently ignore them. For now we stay quiet.
|
* silently ignore them. For now we stay quiet.
|
*/
|
*/
|
if (ax25_dev->values[AX25_VALUES_CONMODE] == 0) {
|
if (ax25_dev->values[AX25_VALUES_CONMODE] == 0) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* LAPB */
|
/* LAPB */
|
|
|
/* AX.25 state 1-4 */
|
/* AX.25 state 1-4 */
|
|
|
ax25_digi_invert(&dp, &reverse_dp);
|
ax25_digi_invert(&dp, &reverse_dp);
|
|
|
if ((ax25 = ax25_find_cb(&dest, &src, &reverse_dp, dev)) != NULL) {
|
if ((ax25 = ax25_find_cb(&dest, &src, &reverse_dp, dev)) != NULL) {
|
/*
|
/*
|
* Process the frame. If it is queued up internally it returns one otherwise we
|
* Process the frame. If it is queued up internally it returns one otherwise we
|
* free it immediately. This routine itself wakes the user context layers so we
|
* free it immediately. This routine itself wakes the user context layers so we
|
* do no further work
|
* do no further work
|
*/
|
*/
|
if (ax25_process_rx_frame(ax25, skb, type, dama) == 0)
|
if (ax25_process_rx_frame(ax25, skb, type, dama) == 0)
|
kfree_skb(skb);
|
kfree_skb(skb);
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* AX.25 state 0 (disconnected) */
|
/* AX.25 state 0 (disconnected) */
|
|
|
/* a) received not a SABM(E) */
|
/* a) received not a SABM(E) */
|
|
|
if ((*skb->data & ~AX25_PF) != AX25_SABM && (*skb->data & ~AX25_PF) != AX25_SABME) {
|
if ((*skb->data & ~AX25_PF) != AX25_SABM && (*skb->data & ~AX25_PF) != AX25_SABME) {
|
/*
|
/*
|
* Never reply to a DM. Also ignore any connects for
|
* Never reply to a DM. Also ignore any connects for
|
* addresses that are not our interfaces and not a socket.
|
* addresses that are not our interfaces and not a socket.
|
*/
|
*/
|
if ((*skb->data & ~AX25_PF) != AX25_DM && mine)
|
if ((*skb->data & ~AX25_PF) != AX25_DM && mine)
|
ax25_return_dm(dev, &src, &dest, &dp);
|
ax25_return_dm(dev, &src, &dest, &dp);
|
|
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* b) received SABM(E) */
|
/* b) received SABM(E) */
|
|
|
if (dp.lastrepeat + 1 == dp.ndigi)
|
if (dp.lastrepeat + 1 == dp.ndigi)
|
sk = ax25_find_listener(&dest, 0, dev, SOCK_SEQPACKET);
|
sk = ax25_find_listener(&dest, 0, dev, SOCK_SEQPACKET);
|
else
|
else
|
sk = ax25_find_listener(next_digi, 1, dev, SOCK_SEQPACKET);
|
sk = ax25_find_listener(next_digi, 1, dev, SOCK_SEQPACKET);
|
|
|
if (sk != NULL) {
|
if (sk != NULL) {
|
if (sk->ack_backlog == sk->max_ack_backlog || (make = ax25_make_new(sk, ax25_dev)) == NULL) {
|
if (sk->ack_backlog == sk->max_ack_backlog || (make = ax25_make_new(sk, ax25_dev)) == NULL) {
|
if (mine) ax25_return_dm(dev, &src, &dest, &dp);
|
if (mine) ax25_return_dm(dev, &src, &dest, &dp);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
ax25 = make->protinfo.ax25;
|
ax25 = make->protinfo.ax25;
|
skb_set_owner_r(skb, make);
|
skb_set_owner_r(skb, make);
|
skb_queue_head(&sk->receive_queue, skb);
|
skb_queue_head(&sk->receive_queue, skb);
|
|
|
make->state = TCP_ESTABLISHED;
|
make->state = TCP_ESTABLISHED;
|
make->pair = sk;
|
make->pair = sk;
|
|
|
sk->ack_backlog++;
|
sk->ack_backlog++;
|
} else {
|
} else {
|
if (!mine) {
|
if (!mine) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if ((ax25 = ax25_create_cb()) == NULL) {
|
if ((ax25 = ax25_create_cb()) == NULL) {
|
ax25_return_dm(dev, &src, &dest, &dp);
|
ax25_return_dm(dev, &src, &dest, &dp);
|
kfree_skb(skb);
|
kfree_skb(skb);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
ax25_fillin_cb(ax25, ax25_dev);
|
ax25_fillin_cb(ax25, ax25_dev);
|
}
|
}
|
|
|
ax25->source_addr = dest;
|
ax25->source_addr = dest;
|
ax25->dest_addr = src;
|
ax25->dest_addr = src;
|
|
|
/*
|
/*
|
* Sort out any digipeated paths.
|
* Sort out any digipeated paths.
|
*/
|
*/
|
if (dp.ndigi && !ax25->digipeat &&
|
if (dp.ndigi && !ax25->digipeat &&
|
(ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
|
(ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
ax25_destroy_socket(ax25);
|
ax25_destroy_socket(ax25);
|
return 0;
|
return 0;
|
}
|
}
|
|
|
if (dp.ndigi == 0) {
|
if (dp.ndigi == 0) {
|
if (ax25->digipeat != NULL) {
|
if (ax25->digipeat != NULL) {
|
kfree(ax25->digipeat);
|
kfree(ax25->digipeat);
|
ax25->digipeat = NULL;
|
ax25->digipeat = NULL;
|
}
|
}
|
} else {
|
} else {
|
/* Reverse the source SABM's path */
|
/* Reverse the source SABM's path */
|
memcpy(ax25->digipeat, &reverse_dp, sizeof(ax25_digi));
|
memcpy(ax25->digipeat, &reverse_dp, sizeof(ax25_digi));
|
}
|
}
|
|
|
if ((*skb->data & ~AX25_PF) == AX25_SABME) {
|
if ((*skb->data & ~AX25_PF) == AX25_SABME) {
|
ax25->modulus = AX25_EMODULUS;
|
ax25->modulus = AX25_EMODULUS;
|
ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
|
ax25->window = ax25_dev->values[AX25_VALUES_EWINDOW];
|
} else {
|
} else {
|
ax25->modulus = AX25_MODULUS;
|
ax25->modulus = AX25_MODULUS;
|
ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
|
ax25->window = ax25_dev->values[AX25_VALUES_WINDOW];
|
}
|
}
|
|
|
ax25_send_control(ax25, AX25_UA, AX25_POLLON, AX25_RESPONSE);
|
ax25_send_control(ax25, AX25_UA, AX25_POLLON, AX25_RESPONSE);
|
|
|
#ifdef CONFIG_AX25_DAMA_SLAVE
|
#ifdef CONFIG_AX25_DAMA_SLAVE
|
if (dama && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
|
if (dama && ax25->ax25_dev->values[AX25_VALUES_PROTOCOL] == AX25_PROTO_DAMA_SLAVE)
|
ax25_dama_on(ax25);
|
ax25_dama_on(ax25);
|
#endif
|
#endif
|
|
|
ax25->state = AX25_STATE_3;
|
ax25->state = AX25_STATE_3;
|
|
|
ax25_insert_socket(ax25);
|
ax25_insert_socket(ax25);
|
|
|
ax25_start_heartbeat(ax25);
|
ax25_start_heartbeat(ax25);
|
ax25_start_t3timer(ax25);
|
ax25_start_t3timer(ax25);
|
ax25_start_idletimer(ax25);
|
ax25_start_idletimer(ax25);
|
|
|
if (sk != NULL) {
|
if (sk != NULL) {
|
if (!sk->dead)
|
if (!sk->dead)
|
sk->data_ready(sk, skb->len);
|
sk->data_ready(sk, skb->len);
|
} else {
|
} else {
|
kfree_skb(skb);
|
kfree_skb(skb);
|
}
|
}
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/*
|
/*
|
* Receive an AX.25 frame via a SLIP interface.
|
* Receive an AX.25 frame via a SLIP interface.
|
*/
|
*/
|
int ax25_kiss_rcv(struct sk_buff *skb, struct net_device *dev,
|
int ax25_kiss_rcv(struct sk_buff *skb, struct net_device *dev,
|
struct packet_type *ptype)
|
struct packet_type *ptype)
|
{
|
{
|
skb->sk = NULL; /* Initially we don't know who it's for */
|
skb->sk = NULL; /* Initially we don't know who it's for */
|
skb->destructor = NULL; /* Who initializes this, dammit?! */
|
skb->destructor = NULL; /* Who initializes this, dammit?! */
|
|
|
if ((*skb->data & 0x0F) != 0) {
|
if ((*skb->data & 0x0F) != 0) {
|
kfree_skb(skb); /* Not a KISS data frame */
|
kfree_skb(skb); /* Not a KISS data frame */
|
return 0;
|
return 0;
|
}
|
}
|
|
|
skb_pull(skb, AX25_KISS_HEADER_LEN); /* Remove the KISS byte */
|
skb_pull(skb, AX25_KISS_HEADER_LEN); /* Remove the KISS byte */
|
|
|
return ax25_rcv(skb, dev, (ax25_address *)dev->dev_addr, ptype);
|
return ax25_rcv(skb, dev, (ax25_address *)dev->dev_addr, ptype);
|
}
|
}
|
|
|
|
|
