2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* This program 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.
|
|
|
|
*
|
|
|
|
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
|
|
|
|
*/
|
|
|
|
#include <linux/config.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 <net/ax25.h>
|
|
|
|
#include <linux/inet.h>
|
|
|
|
#include <linux/netdevice.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/termios.h> /* For TIOCINQ/OUTQ */
|
|
|
|
#include <linux/mm.h>
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/proc_fs.h>
|
|
|
|
#include <linux/stat.h>
|
|
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <linux/sysctl.h>
|
|
|
|
#include <net/ip.h>
|
|
|
|
#include <net/arp.h>
|
|
|
|
|
|
|
|
/*
|
|
|
|
* IP over AX.25 encapsulation.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Shove an AX.25 UI header on an IP packet and handle ARP
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifdef CONFIG_INET
|
|
|
|
|
|
|
|
int ax25_encapsulate(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
|
|
|
|
{
|
|
|
|
unsigned char *buff;
|
|
|
|
|
|
|
|
/* they sometimes come back to us... */
|
|
|
|
if (type == ETH_P_AX25)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* header is an AX.25 UI frame from us to them */
|
|
|
|
buff = skb_push(skb, AX25_HEADER_LEN);
|
|
|
|
*buff++ = 0x00; /* KISS DATA */
|
|
|
|
|
|
|
|
if (daddr != NULL)
|
|
|
|
memcpy(buff, daddr, dev->addr_len); /* Address specified */
|
|
|
|
|
|
|
|
buff[6] &= ~AX25_CBIT;
|
|
|
|
buff[6] &= ~AX25_EBIT;
|
|
|
|
buff[6] |= AX25_SSSID_SPARE;
|
|
|
|
buff += AX25_ADDR_LEN;
|
|
|
|
|
|
|
|
if (saddr != NULL)
|
|
|
|
memcpy(buff, saddr, dev->addr_len);
|
|
|
|
else
|
|
|
|
memcpy(buff, dev->dev_addr, dev->addr_len);
|
|
|
|
|
|
|
|
buff[6] &= ~AX25_CBIT;
|
|
|
|
buff[6] |= AX25_EBIT;
|
|
|
|
buff[6] |= AX25_SSSID_SPARE;
|
|
|
|
buff += AX25_ADDR_LEN;
|
|
|
|
|
|
|
|
*buff++ = AX25_UI; /* UI */
|
|
|
|
|
|
|
|
/* Append a suitable AX.25 PID */
|
|
|
|
switch (type) {
|
|
|
|
case ETH_P_IP:
|
|
|
|
*buff++ = AX25_P_IP;
|
|
|
|
break;
|
|
|
|
case ETH_P_ARP:
|
|
|
|
*buff++ = AX25_P_ARP;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
printk(KERN_ERR "AX.25: ax25_encapsulate - wrong protocol type 0x%2.2x\n", type);
|
|
|
|
*buff++ = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (daddr != NULL)
|
|
|
|
return AX25_HEADER_LEN;
|
|
|
|
|
|
|
|
return -AX25_HEADER_LEN; /* Unfinished header */
|
|
|
|
}
|
|
|
|
|
|
|
|
int ax25_rebuild_header(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct sk_buff *ourskb;
|
|
|
|
unsigned char *bp = skb->data;
|
|
|
|
struct net_device *dev;
|
|
|
|
ax25_address *src, *dst;
|
|
|
|
ax25_dev *ax25_dev;
|
|
|
|
ax25_route _route, *route = &_route;
|
|
|
|
ax25_cb *ax25;
|
|
|
|
|
|
|
|
dst = (ax25_address *)(bp + 1);
|
|
|
|
src = (ax25_address *)(bp + 8);
|
|
|
|
|
|
|
|
if (arp_find(bp + 1, skb))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
route = ax25_rt_find_route(route, dst, NULL);
|
|
|
|
dev = route->dev;
|
|
|
|
|
|
|
|
if (dev == NULL)
|
|
|
|
dev = skb->dev;
|
|
|
|
|
|
|
|
if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {
|
|
|
|
goto put;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (bp[16] == AX25_P_IP) {
|
|
|
|
if (route->ip_mode == 'V' || (route->ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) {
|
|
|
|
/*
|
|
|
|
* We copy the buffer and release the original thereby
|
|
|
|
* keeping it straight
|
|
|
|
*
|
|
|
|
* Note: we report 1 back so the caller will
|
|
|
|
* not feed the frame direct to the physical device
|
|
|
|
* We don't want that to happen. (It won't be upset
|
|
|
|
* as we have pulled the frame from the queue by
|
|
|
|
* freeing it).
|
|
|
|
*
|
|
|
|
* NB: TCP modifies buffers that are still
|
|
|
|
* on a device queue, thus we use skb_copy()
|
|
|
|
* instead of using skb_clone() unless this
|
|
|
|
* gets fixed.
|
|
|
|
*/
|
|
|
|
|
|
|
|
ax25_address src_c;
|
|
|
|
ax25_address dst_c;
|
|
|
|
|
|
|
|
if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) {
|
|
|
|
kfree_skb(skb);
|
|
|
|
goto put;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (skb->sk != NULL)
|
|
|
|
skb_set_owner_w(ourskb, skb->sk);
|
|
|
|
|
|
|
|
kfree_skb(skb);
|
|
|
|
/* dl9sau: bugfix
|
|
|
|
* after kfree_skb(), dst and src which were pointer
|
|
|
|
* to bp which is part of skb->data would not be valid
|
|
|
|
* anymore hope that after skb_pull(ourskb, ..) our
|
|
|
|
* dsc_c and src_c will not become invalid
|
|
|
|
*/
|
|
|
|
bp = ourskb->data;
|
|
|
|
dst_c = *(ax25_address *)(bp + 1);
|
|
|
|
src_c = *(ax25_address *)(bp + 8);
|
|
|
|
|
|
|
|
skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */
|
|
|
|
ourskb->nh.raw = ourskb->data;
|
|
|
|
|
|
|
|
ax25=ax25_send_frame(
|
|
|
|
ourskb,
|
|
|
|
ax25_dev->values[AX25_VALUES_PACLEN],
|
|
|
|
&src_c,
|
|
|
|
&dst_c, route->digipeat, dev);
|
|
|
|
if (ax25) {
|
|
|
|
ax25_cb_put(ax25);
|
|
|
|
}
|
|
|
|
goto put;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
bp[7] &= ~AX25_CBIT;
|
|
|
|
bp[7] &= ~AX25_EBIT;
|
|
|
|
bp[7] |= AX25_SSSID_SPARE;
|
|
|
|
|
|
|
|
bp[14] &= ~AX25_CBIT;
|
|
|
|
bp[14] |= AX25_EBIT;
|
|
|
|
bp[14] |= AX25_SSSID_SPARE;
|
|
|
|
|
|
|
|
skb_pull(skb, AX25_KISS_HEADER_LEN);
|
|
|
|
|
|
|
|
if (route->digipeat != NULL) {
|
|
|
|
if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) {
|
|
|
|
kfree_skb(skb);
|
|
|
|
goto put;
|
|
|
|
}
|
|
|
|
|
|
|
|
skb = ourskb;
|
|
|
|
}
|
|
|
|
|
2005-04-21 17:46:56 -06:00
|
|
|
ax25_queue_xmit(skb, dev);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
put:
|
|
|
|
ax25_put_route(route);
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
#else /* INET */
|
|
|
|
|
|
|
|
int ax25_encapsulate(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
|
|
|
|
{
|
|
|
|
return -AX25_HEADER_LEN;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ax25_rebuild_header(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|