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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);

        }

}