Viewing file:  ax25_uid.c (3.82 KB) -rw-r--r--
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/*
* AX.25 release 037
*
* 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
* AX.25 036 Jonathan(G4KLX) Split from af_ax25.c.
*/
#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/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>
/*
* Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
*/
static ax25_uid_assoc *ax25_uid_list;
int ax25_uid_policy = 0;
ax25_address *ax25_findbyuid(uid_t uid)
{
ax25_uid_assoc *ax25_uid;
for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
if (ax25_uid->uid == uid)
return &ax25_uid->call;
}
return NULL;
}
int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
{
ax25_uid_assoc *s, *ax25_uid;
unsigned long flags;
switch (cmd) {
case SIOCAX25GETUID:
for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
return ax25_uid->uid;
}
return -ENOENT;
case SIOCAX25ADDUID:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (ax25_findbyuid(sax->sax25_uid))
return -EEXIST;
if (sax->sax25_uid == 0)
return -EINVAL;
if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
return -ENOMEM;
ax25_uid->uid = sax->sax25_uid;
ax25_uid->call = sax->sax25_call;
save_flags(flags); cli();
ax25_uid->next = ax25_uid_list;
ax25_uid_list = ax25_uid;
restore_flags(flags);
return 0;
case SIOCAX25DELUID:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
for (ax25_uid = ax25_uid_list; ax25_uid != NULL; ax25_uid = ax25_uid->next) {
if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
break;
}
if (ax25_uid == NULL)
return -ENOENT;
save_flags(flags); cli();
if ((s = ax25_uid_list) == ax25_uid) {
ax25_uid_list = s->next;
restore_flags(flags);
kfree(ax25_uid);
return 0;
}
while (s != NULL && s->next != NULL) {
if (s->next == ax25_uid) {
s->next = ax25_uid->next;
restore_flags(flags);
kfree(ax25_uid);
return 0;
}
s = s->next;
}
restore_flags(flags);
return -ENOENT;
default:
return -EINVAL;
}
return -EINVAL; /*NOTREACHED */
}
int ax25_uid_get_info(char *buffer, char **start, off_t offset, int length)
{
ax25_uid_assoc *pt;
int len = 0;
off_t pos = 0;
off_t begin = 0;
cli();
len += sprintf(buffer, "Policy: %d\n", ax25_uid_policy);
for (pt = ax25_uid_list; pt != NULL; pt = pt->next) {
len += sprintf(buffer + len, "%6d %s\n", pt->uid, ax2asc(&pt->call));
pos = begin + len;
if (pos < offset) {
len = 0;
begin = pos;
}
if (pos > offset + length)
break;
}
sti();
*start = buffer + (offset - begin);
len -= offset - begin;
if (len > length) len = length;
return len;
}
/*
* Free all memory associated with UID/Callsign structures.
*/
void __exit ax25_uid_free(void)
{
ax25_uid_assoc *s, *ax25_uid = ax25_uid_list;
while (ax25_uid != NULL) {
s = ax25_uid;
ax25_uid = ax25_uid->next;
kfree(s);
}
}
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