Release 4.15 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/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/spinlock.h>
#include <linux/slab.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 <linux/uaccess.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/sysctl.h>
#include <linux/export.h>
#include <net/ip.h>
#include <net/arp.h>

/*
 *      Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
 */

static HLIST_HEAD(ax25_uid_list);
static DEFINE_RWLOCK(ax25_uid_lock);


int ax25_uid_policy;


EXPORT_SYMBOL(ax25_uid_policy);



ax25_uid_assoc *ax25_findbyuid(kuid_t uid)
{
	ax25_uid_assoc *ax25_uid, *res = NULL;

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

	return res;
}

Contributors
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Ralf Bächle
37
57.81%
3
60.00%
Linus Torvalds (pre-git)
22
34.38%
1
20.00%
Eric W. Biedermann
5
7.81%
1
20.00%
Total
64
100.00%
5
100.00%


EXPORT_SYMBOL(ax25_findbyuid);



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

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

		return res;

	case SIOCAX25ADDUID:
	{
		kuid_t sax25_kuid;
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		sax25_kuid = make_kuid(current_user_ns(), sax->sax25_uid);
		if (!uid_valid(sax25_kuid))
			return -EINVAL;
		user = ax25_findbyuid(sax25_kuid);
		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;

		refcount_set(&ax25_uid->refcount, 1);
		ax25_uid->uid  = sax25_kuid;
		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, &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 */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
206
59.54%
2
28.57%
Ralf Bächle
103
29.77%
3
42.86%
Eric W. Biedermann
36
10.40%
1
14.29%
Elena Reshetova
1
0.29%
1
14.29%
Total
346
100.00%
7
100.00%

#ifdef CONFIG_PROC_FS


static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
	
__acquires(ax25_uid_lock)
{
	read_lock(&ax25_uid_lock);
	return seq_hlist_start_head(&ax25_uid_list, *pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
13
36.11%
1
12.50%
Linus Torvalds (pre-git)
7
19.44%
1
12.50%
Ralf Bächle
7
19.44%
3
37.50%
Li Zefan
4
11.11%
1
12.50%
Eric Dumazet
4
11.11%
1
12.50%
Alan Cox
1
2.78%
1
12.50%
Total
36
100.00%
8
100.00%



static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	return seq_hlist_next(v, &ax25_uid_list, pos);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
23
74.19%
1
33.33%
Ralf Bächle
4
12.90%
1
33.33%
Li Zefan
4
12.90%
1
33.33%
Total
31
100.00%
3
100.00%


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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
21
84.00%
1
50.00%
Eric Dumazet
4
16.00%
1
50.00%
Total
25
100.00%
2
100.00%



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;

		pt = hlist_entry(v, struct ax25_uid_assoc, uid_node);
		seq_printf(seq, "%6d %s\n",
			from_kuid_munged(seq_user_ns(seq), pt->uid),
			ax2asc(buf, &pt->call));
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
40
45.45%
1
16.67%
Linus Torvalds (pre-git)
19
21.59%
1
16.67%
Li Zefan
12
13.64%
1
16.67%
Ralf Bächle
8
9.09%
1
16.67%
Eric W. Biedermann
8
9.09%
1
16.67%
Joe Perches
1
1.14%
1
16.67%
Total
88
100.00%
6
100.00%


static const 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Hemminger
22
88.00%
1
50.00%
Linus Torvalds (pre-git)
3
12.00%
1
50.00%
Total
25
100.00%
2
100.00%


const 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;

	write_lock(&ax25_uid_lock);
again:
	ax25_uid_for_each(ax25_uid, &ax25_uid_list) {
		hlist_del_init(&ax25_uid->uid_node);
		ax25_uid_put(ax25_uid);
		goto again;
	}
	write_unlock(&ax25_uid_lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Ralf Bächle
25
50.00%
3
50.00%
Linus Torvalds (pre-git)
20
40.00%
2
33.33%
Pavel Emelyanov
5
10.00%
1
16.67%
Total
50
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
360
42.30%
3
12.50%
Ralf Bächle
207
24.32%
6
25.00%
Stephen Hemminger
182
21.39%
1
4.17%
Eric W. Biedermann
49
5.76%
1
4.17%
Li Zefan
20
2.35%
1
4.17%
Eric Dumazet
9
1.06%
1
4.17%
Pavel Emelyanov
5
0.59%
1
4.17%
Thomas Gleixner
4
0.47%
1
4.17%
Paul Gortmaker
3
0.35%
1
4.17%
Randy Dunlap
3
0.35%
1
4.17%
Tejun Heo
3
0.35%
1
4.17%
Philippe De Muyter
1
0.12%
1
4.17%
Linus Torvalds
1
0.12%
1
4.17%
Alan Cox
1
0.12%
1
4.17%
Joe Perches
1
0.12%
1
4.17%
Arjan van de Ven
1
0.12%
1
4.17%
Elena Reshetova
1
0.12%
1
4.17%
Total
851
100.00%
24
100.00%
Directory: net/ax25

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