535 lines
12 KiB
C
535 lines
12 KiB
C
/*
|
|
* 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) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
|
|
* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
|
|
* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
|
|
* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
|
|
* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
|
|
* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
|
|
*/
|
|
|
|
#include <linux/capability.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/in.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.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 <linux/spinlock.h>
|
|
#include <net/sock.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/init.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
static ax25_route *ax25_route_list;
|
|
static DEFINE_RWLOCK(ax25_route_lock);
|
|
|
|
static ax25_route *ax25_get_route(ax25_address *, struct net_device *);
|
|
|
|
void ax25_rt_device_down(struct net_device *dev)
|
|
{
|
|
ax25_route *s, *t, *ax25_rt;
|
|
|
|
write_lock(&ax25_route_lock);
|
|
ax25_rt = ax25_route_list;
|
|
while (ax25_rt != NULL) {
|
|
s = ax25_rt;
|
|
ax25_rt = ax25_rt->next;
|
|
|
|
if (s->dev == dev) {
|
|
if (ax25_route_list == s) {
|
|
ax25_route_list = s->next;
|
|
kfree(s->digipeat);
|
|
kfree(s);
|
|
} else {
|
|
for (t = ax25_route_list; t != NULL; t = t->next) {
|
|
if (t->next == s) {
|
|
t->next = s->next;
|
|
kfree(s->digipeat);
|
|
kfree(s);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
write_unlock(&ax25_route_lock);
|
|
}
|
|
|
|
static int ax25_rt_add(struct ax25_routes_struct *route)
|
|
{
|
|
ax25_route *ax25_rt;
|
|
ax25_dev *ax25_dev;
|
|
int i;
|
|
|
|
if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
|
|
return -EINVAL;
|
|
if (route->digi_count > AX25_MAX_DIGIS)
|
|
return -EINVAL;
|
|
|
|
write_lock(&ax25_route_lock);
|
|
|
|
ax25_rt = ax25_route_list;
|
|
while (ax25_rt != NULL) {
|
|
if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
|
|
ax25_rt->dev == ax25_dev->dev) {
|
|
kfree(ax25_rt->digipeat);
|
|
ax25_rt->digipeat = NULL;
|
|
if (route->digi_count != 0) {
|
|
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
|
|
write_unlock(&ax25_route_lock);
|
|
return -ENOMEM;
|
|
}
|
|
ax25_rt->digipeat->lastrepeat = -1;
|
|
ax25_rt->digipeat->ndigi = route->digi_count;
|
|
for (i = 0; i < route->digi_count; i++) {
|
|
ax25_rt->digipeat->repeated[i] = 0;
|
|
ax25_rt->digipeat->calls[i] = route->digi_addr[i];
|
|
}
|
|
}
|
|
write_unlock(&ax25_route_lock);
|
|
return 0;
|
|
}
|
|
ax25_rt = ax25_rt->next;
|
|
}
|
|
|
|
if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
|
|
write_unlock(&ax25_route_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
atomic_set(&ax25_rt->ref, 0);
|
|
ax25_rt->callsign = route->dest_addr;
|
|
ax25_rt->dev = ax25_dev->dev;
|
|
ax25_rt->digipeat = NULL;
|
|
ax25_rt->ip_mode = ' ';
|
|
if (route->digi_count != 0) {
|
|
if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
|
|
write_unlock(&ax25_route_lock);
|
|
kfree(ax25_rt);
|
|
return -ENOMEM;
|
|
}
|
|
ax25_rt->digipeat->lastrepeat = -1;
|
|
ax25_rt->digipeat->ndigi = route->digi_count;
|
|
for (i = 0; i < route->digi_count; i++) {
|
|
ax25_rt->digipeat->repeated[i] = 0;
|
|
ax25_rt->digipeat->calls[i] = route->digi_addr[i];
|
|
}
|
|
}
|
|
ax25_rt->next = ax25_route_list;
|
|
ax25_route_list = ax25_rt;
|
|
write_unlock(&ax25_route_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ax25_rt_destroy(ax25_route *ax25_rt)
|
|
{
|
|
if (atomic_read(&ax25_rt->ref) == 0) {
|
|
kfree(ax25_rt->digipeat);
|
|
kfree(ax25_rt);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Uh... Route is still in use; we can't yet destroy it. Retry later.
|
|
*/
|
|
init_timer(&ax25_rt->timer);
|
|
ax25_rt->timer.data = (unsigned long) ax25_rt;
|
|
ax25_rt->timer.function = (void *) ax25_rt_destroy;
|
|
ax25_rt->timer.expires = jiffies + 5 * HZ;
|
|
|
|
add_timer(&ax25_rt->timer);
|
|
}
|
|
|
|
static int ax25_rt_del(struct ax25_routes_struct *route)
|
|
{
|
|
ax25_route *s, *t, *ax25_rt;
|
|
ax25_dev *ax25_dev;
|
|
|
|
if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
|
|
return -EINVAL;
|
|
|
|
write_lock(&ax25_route_lock);
|
|
|
|
ax25_rt = ax25_route_list;
|
|
while (ax25_rt != NULL) {
|
|
s = ax25_rt;
|
|
ax25_rt = ax25_rt->next;
|
|
if (s->dev == ax25_dev->dev &&
|
|
ax25cmp(&route->dest_addr, &s->callsign) == 0) {
|
|
if (ax25_route_list == s) {
|
|
ax25_route_list = s->next;
|
|
ax25_rt_destroy(s);
|
|
} else {
|
|
for (t = ax25_route_list; t != NULL; t = t->next) {
|
|
if (t->next == s) {
|
|
t->next = s->next;
|
|
ax25_rt_destroy(s);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
write_unlock(&ax25_route_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
|
|
{
|
|
ax25_route *ax25_rt;
|
|
ax25_dev *ax25_dev;
|
|
int err = 0;
|
|
|
|
if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
|
|
return -EINVAL;
|
|
|
|
write_lock(&ax25_route_lock);
|
|
|
|
ax25_rt = ax25_route_list;
|
|
while (ax25_rt != NULL) {
|
|
if (ax25_rt->dev == ax25_dev->dev &&
|
|
ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
|
|
switch (rt_option->cmd) {
|
|
case AX25_SET_RT_IPMODE:
|
|
switch (rt_option->arg) {
|
|
case ' ':
|
|
case 'D':
|
|
case 'V':
|
|
ax25_rt->ip_mode = rt_option->arg;
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
ax25_rt = ax25_rt->next;
|
|
}
|
|
|
|
out:
|
|
write_unlock(&ax25_route_lock);
|
|
return err;
|
|
}
|
|
|
|
int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
|
|
{
|
|
struct ax25_route_opt_struct rt_option;
|
|
struct ax25_routes_struct route;
|
|
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
if (copy_from_user(&route, arg, sizeof(route)))
|
|
return -EFAULT;
|
|
return ax25_rt_add(&route);
|
|
|
|
case SIOCDELRT:
|
|
if (copy_from_user(&route, arg, sizeof(route)))
|
|
return -EFAULT;
|
|
return ax25_rt_del(&route);
|
|
|
|
case SIOCAX25OPTRT:
|
|
if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
|
|
return -EFAULT;
|
|
return ax25_rt_opt(&rt_option);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct ax25_route *ax25_rt;
|
|
int i = 1;
|
|
|
|
read_lock(&ax25_route_lock);
|
|
if (*pos == 0)
|
|
return SEQ_START_TOKEN;
|
|
|
|
for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
|
|
if (i == *pos)
|
|
return ax25_rt;
|
|
++i;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
++*pos;
|
|
return (v == SEQ_START_TOKEN) ? ax25_route_list :
|
|
((struct ax25_route *) v)->next;
|
|
}
|
|
|
|
static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
read_unlock(&ax25_route_lock);
|
|
}
|
|
|
|
static int ax25_rt_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
char buf[11];
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, "callsign dev mode digipeaters\n");
|
|
else {
|
|
struct ax25_route *ax25_rt = v;
|
|
const char *callsign;
|
|
int i;
|
|
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
|
|
callsign = "default";
|
|
else
|
|
callsign = ax2asc(buf, &ax25_rt->callsign);
|
|
|
|
seq_printf(seq, "%-9s %-4s",
|
|
callsign,
|
|
ax25_rt->dev ? ax25_rt->dev->name : "???");
|
|
|
|
switch (ax25_rt->ip_mode) {
|
|
case 'V':
|
|
seq_puts(seq, " vc");
|
|
break;
|
|
case 'D':
|
|
seq_puts(seq, " dg");
|
|
break;
|
|
default:
|
|
seq_puts(seq, " *");
|
|
break;
|
|
}
|
|
|
|
if (ax25_rt->digipeat != NULL)
|
|
for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
|
|
seq_printf(seq, " %s",
|
|
ax2asc(buf, &ax25_rt->digipeat->calls[i]));
|
|
|
|
seq_puts(seq, "\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct seq_operations ax25_rt_seqops = {
|
|
.start = ax25_rt_seq_start,
|
|
.next = ax25_rt_seq_next,
|
|
.stop = ax25_rt_seq_stop,
|
|
.show = ax25_rt_seq_show,
|
|
};
|
|
|
|
static int ax25_rt_info_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &ax25_rt_seqops);
|
|
}
|
|
|
|
struct file_operations ax25_route_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ax25_rt_info_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Find AX.25 route
|
|
*
|
|
* Only routes with a refernce rout of zero can be destroyed.
|
|
*/
|
|
static ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
|
|
{
|
|
ax25_route *ax25_spe_rt = NULL;
|
|
ax25_route *ax25_def_rt = NULL;
|
|
ax25_route *ax25_rt;
|
|
|
|
read_lock(&ax25_route_lock);
|
|
/*
|
|
* Bind to the physical interface we heard them on, or the default
|
|
* route if none is found;
|
|
*/
|
|
for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
|
|
if (dev == NULL) {
|
|
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
|
|
ax25_spe_rt = ax25_rt;
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
|
|
ax25_def_rt = ax25_rt;
|
|
} else {
|
|
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
|
|
ax25_spe_rt = ax25_rt;
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
|
|
ax25_def_rt = ax25_rt;
|
|
}
|
|
}
|
|
|
|
ax25_rt = ax25_def_rt;
|
|
if (ax25_spe_rt != NULL)
|
|
ax25_rt = ax25_spe_rt;
|
|
|
|
if (ax25_rt != NULL)
|
|
atomic_inc(&ax25_rt->ref);
|
|
|
|
read_unlock(&ax25_route_lock);
|
|
|
|
return ax25_rt;
|
|
}
|
|
|
|
/*
|
|
* Adjust path: If you specify a default route and want to connect
|
|
* a target on the digipeater path but w/o having a special route
|
|
* set before, the path has to be truncated from your target on.
|
|
*/
|
|
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
|
|
{
|
|
int k;
|
|
|
|
for (k = 0; k < digipeat->ndigi; k++) {
|
|
if (ax25cmp(addr, &digipeat->calls[k]) == 0)
|
|
break;
|
|
}
|
|
|
|
digipeat->ndigi = k;
|
|
}
|
|
|
|
|
|
/*
|
|
* Find which interface to use.
|
|
*/
|
|
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
|
|
{
|
|
ax25_uid_assoc *user;
|
|
ax25_route *ax25_rt;
|
|
int err;
|
|
|
|
if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
|
|
return -EHOSTUNREACH;
|
|
|
|
if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
|
|
err = -EHOSTUNREACH;
|
|
goto put;
|
|
}
|
|
|
|
user = ax25_findbyuid(current->euid);
|
|
if (user) {
|
|
ax25->source_addr = user->call;
|
|
ax25_uid_put(user);
|
|
} else {
|
|
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
|
|
err = -EPERM;
|
|
goto put;
|
|
}
|
|
ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
|
|
}
|
|
|
|
if (ax25_rt->digipeat != NULL) {
|
|
if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
|
|
err = -ENOMEM;
|
|
goto put;
|
|
}
|
|
memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
|
|
ax25_adjust_path(addr, ax25->digipeat);
|
|
}
|
|
|
|
if (ax25->sk != NULL) {
|
|
bh_lock_sock(ax25->sk);
|
|
sock_reset_flag(ax25->sk, SOCK_ZAPPED);
|
|
bh_unlock_sock(ax25->sk);
|
|
}
|
|
|
|
put:
|
|
ax25_put_route(ax25_rt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr,
|
|
struct net_device *dev)
|
|
{
|
|
ax25_route *ax25_rt;
|
|
|
|
if ((ax25_rt = ax25_get_route(addr, dev)))
|
|
return ax25_rt;
|
|
|
|
route->next = NULL;
|
|
atomic_set(&route->ref, 1);
|
|
route->callsign = *addr;
|
|
route->dev = dev;
|
|
route->digipeat = NULL;
|
|
route->ip_mode = ' ';
|
|
|
|
return route;
|
|
}
|
|
|
|
struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
|
|
ax25_address *dest, ax25_digi *digi)
|
|
{
|
|
struct sk_buff *skbn;
|
|
unsigned char *bp;
|
|
int len;
|
|
|
|
len = digi->ndigi * AX25_ADDR_LEN;
|
|
|
|
if (skb_headroom(skb) < len) {
|
|
if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
|
|
printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (skb->sk != NULL)
|
|
skb_set_owner_w(skbn, skb->sk);
|
|
|
|
kfree_skb(skb);
|
|
|
|
skb = skbn;
|
|
}
|
|
|
|
bp = skb_push(skb, len);
|
|
|
|
ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
|
|
|
|
return skb;
|
|
}
|
|
|
|
/*
|
|
* Free all memory associated with routing structures.
|
|
*/
|
|
void __exit ax25_rt_free(void)
|
|
{
|
|
ax25_route *s, *ax25_rt = ax25_route_list;
|
|
|
|
write_lock(&ax25_route_lock);
|
|
while (ax25_rt != NULL) {
|
|
s = ax25_rt;
|
|
ax25_rt = ax25_rt->next;
|
|
|
|
kfree(s->digipeat);
|
|
kfree(s);
|
|
}
|
|
write_unlock(&ax25_route_lock);
|
|
}
|