[mirror_ubuntu-artful-kernel.git] / net / ax25 / ax25_uid.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) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 */

#include <linux/capability.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 <linux/spinlock.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/list.h>
#include <linux/notifier.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.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.
 */

HLIST_HEAD(ax25_uid_list);
static DEFINE_RWLOCK(ax25_uid_lock);

int ax25_uid_policy = 0;

ax25_uid_assoc *ax25_findbyuid(uid_t uid)
{
	ax25_uid_assoc *ax25_uid, *res = NULL;
	struct hlist_node *node;

	read_lock(&ax25_uid_lock);
	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
		if (ax25_uid->uid == uid) {
			ax25_uid_hold(ax25_uid);
			res = ax25_uid;
			break;
		}
	}
	read_unlock(&ax25_uid_lock);

	return res;
}

int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
{
	ax25_uid_assoc *ax25_uid;
	struct hlist_node *node;
	ax25_uid_assoc *user;
	unsigned long res;

	switch (cmd) {
	case SIOCAX25GETUID:
		res = -ENOENT;
		read_lock(&ax25_uid_lock);
		ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
			if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
				res = ax25_uid->uid;
				break;
			}
		}
		read_unlock(&ax25_uid_lock);

		return res;

	case SIOCAX25ADDUID:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		user = ax25_findbyuid(sax->sax25_uid);
		if (user) {
			ax25_uid_put(user);
			return -EEXIST;
		}
		if (sax->sax25_uid == 0)
			return -EINVAL;
		if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
			return -ENOMEM;

		atomic_set(&ax25_uid->refcount, 1);
		ax25_uid->uid  = sax->sax25_uid;
		ax25_uid->call = sax->sax25_call;

		write_lock(&ax25_uid_lock);
		hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
		write_unlock(&ax25_uid_lock);

		return 0;

	case SIOCAX25DELUID:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

		ax25_uid = NULL;
		write_lock(&ax25_uid_lock);
		ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
			if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
				break;
		}
		if (ax25_uid == NULL) {
			write_unlock(&ax25_uid_lock);
			return -ENOENT;
		}
		hlist_del_init(&ax25_uid->uid_node);
		ax25_uid_put(ax25_uid);
		write_unlock(&ax25_uid_lock);

		return 0;

	default:
		return -EINVAL;
	}

	return -EINVAL;	/*NOTREACHED */
}

#ifdef CONFIG_PROC_FS

static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
{
	struct ax25_uid_assoc *pt;
	struct hlist_node *node;
	int i = 0;

	read_lock(&ax25_uid_lock);
	ax25_uid_for_each(pt, node, &ax25_uid_list) {
		if (i == *pos)
			return pt;
		++i;
	}
	return NULL;
}

static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;

	return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next,
	                   ax25_uid_assoc, uid_node);
}

static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
{
	read_unlock(&ax25_uid_lock);
}

static int ax25_uid_seq_show(struct seq_file *seq, void *v)
{
	char buf[11];

	if (v == SEQ_START_TOKEN)
		seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
	else {
		struct ax25_uid_assoc *pt = v;

		seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
	}
	return 0;
}

static struct seq_operations ax25_uid_seqops = {
	.start = ax25_uid_seq_start,
	.next = ax25_uid_seq_next,
	.stop = ax25_uid_seq_stop,
	.show = ax25_uid_seq_show,
};

static int ax25_uid_info_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &ax25_uid_seqops);
}

struct file_operations ax25_uid_fops = {
	.owner = THIS_MODULE,
	.open = ax25_uid_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

#endif

/*
 *	Free all memory associated with UID/Callsign structures.
 */
void __exit ax25_uid_free(void)
{
	ax25_uid_assoc *ax25_uid;
	struct hlist_node *node;

	write_lock(&ax25_uid_lock);
	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
		hlist_del_init(&ax25_uid->uid_node);
		ax25_uid_put(ax25_uid);
	}
	write_unlock(&ax25_uid_lock);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	8	*/
4fc268d2 RD	9
4fc268d2 RD	10	#include <linux/capability.h>
1da177e4 LT	11	#include <linux/errno.h>
	12	#include <linux/types.h>
	13	#include <linux/socket.h>
	14	#include <linux/in.h>
	15	#include <linux/kernel.h>
	16	#include <linux/sched.h>
	17	#include <linux/timer.h>
	18	#include <linux/string.h>
	19	#include <linux/sockios.h>
	20	#include <linux/net.h>
	21	#include <linux/spinlock.h>
	22	#include <net/ax25.h>
	23	#include <linux/inet.h>
	24	#include <linux/netdevice.h>
	25	#include <linux/if_arp.h>
	26	#include <linux/skbuff.h>
	27	#include <net/sock.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/system.h>
	30	#include <linux/fcntl.h>
	31	#include <linux/mm.h>
	32	#include <linux/interrupt.h>
01d7dd0e	33	#include <linux/list.h>
1da177e4 LT	34	#include <linux/notifier.h>
	35	#include <linux/proc_fs.h>
	36	#include <linux/seq_file.h>
	37	#include <linux/stat.h>
	38	#include <linux/netfilter.h>
	39	#include <linux/sysctl.h>
	40	#include <net/ip.h>
	41	#include <net/arp.h>
	42
	43	/*
	44	* Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
	45	*/
	46
01d7dd0e	47	HLIST_HEAD(ax25_uid_list);
1da177e4 LT	48	static DEFINE_RWLOCK(ax25_uid_lock);
	49
	50	int ax25_uid_policy = 0;
	51
01d7dd0e	52	ax25_uid_assoc *ax25_findbyuid(uid_t uid)
1da177e4	53	{
01d7dd0e RB	54	ax25_uid_assoc ax25_uid, res = NULL;
01d7dd0e RB	55	struct hlist_node *node;
1da177e4 LT	56
1da177e4 LT	57	read_lock(&ax25_uid_lock);
01d7dd0e	58	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
1da177e4	59	if (ax25_uid->uid == uid) {
01d7dd0e RB	60	ax25_uid_hold(ax25_uid);
01d7dd0e RB	61	res = ax25_uid;
1da177e4 LT	62	break;
	63	}
	64	}
	65	read_unlock(&ax25_uid_lock);
	66
01d7dd0e	67	return res;
1da177e4 LT	68	}
	69
	70	int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
	71	{
01d7dd0e RB	72	ax25_uid_assoc *ax25_uid;
	73	struct hlist_node *node;
	74	ax25_uid_assoc *user;
1da177e4 LT	75	unsigned long res;
	76
	77	switch (cmd) {
	78	case SIOCAX25GETUID:
	79	res = -ENOENT;
	80	read_lock(&ax25_uid_lock);
01d7dd0e	81	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
1da177e4 LT	82	if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
	83	res = ax25_uid->uid;
	84	break;
	85	}
	86	}
	87	read_unlock(&ax25_uid_lock);
	88
	89	return res;
	90
	91	case SIOCAX25ADDUID:
	92	if (!capable(CAP_NET_ADMIN))
	93	return -EPERM;
01d7dd0e RB	94	user = ax25_findbyuid(sax->sax25_uid);
	95	if (user) {
	96	ax25_uid_put(user);
1da177e4	97	return -EEXIST;
01d7dd0e	98	}
1da177e4 LT	99	if (sax->sax25_uid == 0)
	100	return -EINVAL;
	101	if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
	102	return -ENOMEM;
	103
01d7dd0e	104	atomic_set(&ax25_uid->refcount, 1);
1da177e4 LT	105	ax25_uid->uid = sax->sax25_uid;
	106	ax25_uid->call = sax->sax25_call;
	107
	108	write_lock(&ax25_uid_lock);
01d7dd0e	109	hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
1da177e4 LT	110	write_unlock(&ax25_uid_lock);
	111
	112	return 0;
	113
	114	case SIOCAX25DELUID:
	115	if (!capable(CAP_NET_ADMIN))
	116	return -EPERM;
	117
01d7dd0e	118	ax25_uid = NULL;
1da177e4	119	write_lock(&ax25_uid_lock);
01d7dd0e RB	120	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
01d7dd0e RB	121	if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
1da177e4	122	break;
1da177e4 LT	123	}
	124	if (ax25_uid == NULL) {
	125	write_unlock(&ax25_uid_lock);
	126	return -ENOENT;
	127	}
01d7dd0e RB	128	hlist_del_init(&ax25_uid->uid_node);
01d7dd0e RB	129	ax25_uid_put(ax25_uid);
1da177e4 LT	130	write_unlock(&ax25_uid_lock);
1da177e4 LT	131
01d7dd0e	132	return 0;
1da177e4 LT	133
	134	default:
	135	return -EINVAL;
	136	}
	137
	138	return -EINVAL; /NOTREACHED /
	139	}
	140
	141	#ifdef CONFIG_PROC_FS
	142
	143	static void ax25_uid_seq_start(struct seq_file seq, loff_t *pos)
	144	{
	145	struct ax25_uid_assoc *pt;
01d7dd0e RB	146	struct hlist_node *node;
01d7dd0e RB	147	int i = 0;
1da177e4 LT	148
1da177e4 LT	149	read_lock(&ax25_uid_lock);
01d7dd0e	150	ax25_uid_for_each(pt, node, &ax25_uid_list) {
1da177e4 LT	151	if (i == *pos)
	152	return pt;
	153	++i;
	154	}
	155	return NULL;
	156	}
	157
	158	static void ax25_uid_seq_next(struct seq_file seq, void v, loff_t pos)
	159	{
	160	++*pos;
01d7dd0e RB	161
	162	return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next,
	163	ax25_uid_assoc, uid_node);
1da177e4 LT	164	}
	165
	166	static void ax25_uid_seq_stop(struct seq_file seq, void v)
	167	{
	168	read_unlock(&ax25_uid_lock);
	169	}
	170
	171	static int ax25_uid_seq_show(struct seq_file seq, void v)
	172	{
f75268cd RB	173	char buf[11];
f75268cd RB	174
1da177e4 LT	175	if (v == SEQ_START_TOKEN)
	176	seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
	177	else {
	178	struct ax25_uid_assoc *pt = v;
1da177e4	179
f75268cd	180	seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
1da177e4 LT	181	}
	182	return 0;
	183	}
	184
	185	static struct seq_operations ax25_uid_seqops = {
	186	.start = ax25_uid_seq_start,
	187	.next = ax25_uid_seq_next,
	188	.stop = ax25_uid_seq_stop,
	189	.show = ax25_uid_seq_show,
	190	};
	191
	192	static int ax25_uid_info_open(struct inode inode, struct file file)
	193	{
	194	return seq_open(file, &ax25_uid_seqops);
	195	}
	196
	197	struct file_operations ax25_uid_fops = {
	198	.owner = THIS_MODULE,
	199	.open = ax25_uid_info_open,
	200	.read = seq_read,
	201	.llseek = seq_lseek,
	202	.release = seq_release,
	203	};
	204
	205	#endif
	206
	207	/*
	208	* Free all memory associated with UID/Callsign structures.
	209	*/
	210	void __exit ax25_uid_free(void)
	211	{
01d7dd0e RB	212	ax25_uid_assoc *ax25_uid;
01d7dd0e RB	213	struct hlist_node *node;
1da177e4 LT	214
1da177e4 LT	215	write_lock(&ax25_uid_lock);
01d7dd0e RB	216	ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
	217	hlist_del_init(&ax25_uid->uid_node);
	218	ax25_uid_put(ax25_uid);
1da177e4	219	}
1da177e4 LT	220	write_unlock(&ax25_uid_lock);
1da177e4 LT	221	}