blob: d349be9578f5bce47be0d42243ca1c7ea34dbcdb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
Randy Dunlap4fc268d2006-01-11 12:17:47 -08009
10#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/errno.h>
12#include <linux/types.h>
13#include <linux/socket.h>
14#include <linux/in.h>
15#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/timer.h>
17#include <linux/string.h>
18#include <linux/sockios.h>
19#include <linux/net.h>
20#include <linux/spinlock.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090021#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#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>
Ralf Baechle01d7dd02005-08-23 10:11:45 -070033#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#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
Eric Dumazetf16f3022008-01-13 22:29:41 -080047static HLIST_HEAD(ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048static DEFINE_RWLOCK(ax25_uid_lock);
49
Eric Dumazetf16f3022008-01-13 22:29:41 -080050int ax25_uid_policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Ralf Baechle70868ea2006-05-03 23:25:17 -070052EXPORT_SYMBOL(ax25_uid_policy);
53
Ralf Baechle01d7dd02005-08-23 10:11:45 -070054ax25_uid_assoc *ax25_findbyuid(uid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070056 ax25_uid_assoc *ax25_uid, *res = NULL;
57 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070060 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 if (ax25_uid->uid == uid) {
Ralf Baechle01d7dd02005-08-23 10:11:45 -070062 ax25_uid_hold(ax25_uid);
63 res = ax25_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 break;
65 }
66 }
67 read_unlock(&ax25_uid_lock);
68
Ralf Baechle01d7dd02005-08-23 10:11:45 -070069 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
Ralf Baechle70868ea2006-05-03 23:25:17 -070072EXPORT_SYMBOL(ax25_findbyuid);
73
Linus Torvalds1da177e2005-04-16 15:20:36 -070074int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
75{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070076 ax25_uid_assoc *ax25_uid;
77 struct hlist_node *node;
78 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 unsigned long res;
80
81 switch (cmd) {
82 case SIOCAX25GETUID:
83 res = -ENOENT;
84 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070085 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
87 res = ax25_uid->uid;
88 break;
89 }
90 }
91 read_unlock(&ax25_uid_lock);
92
93 return res;
94
95 case SIOCAX25ADDUID:
96 if (!capable(CAP_NET_ADMIN))
97 return -EPERM;
Ralf Baechle01d7dd02005-08-23 10:11:45 -070098 user = ax25_findbyuid(sax->sax25_uid);
99 if (user) {
100 ax25_uid_put(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 return -EEXIST;
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700102 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (sax->sax25_uid == 0)
104 return -EINVAL;
105 if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
106 return -ENOMEM;
107
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700108 atomic_set(&ax25_uid->refcount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 ax25_uid->uid = sax->sax25_uid;
110 ax25_uid->call = sax->sax25_call;
111
112 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700113 hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 write_unlock(&ax25_uid_lock);
115
116 return 0;
117
118 case SIOCAX25DELUID:
119 if (!capable(CAP_NET_ADMIN))
120 return -EPERM;
121
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700122 ax25_uid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700124 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
125 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 }
128 if (ax25_uid == NULL) {
129 write_unlock(&ax25_uid_lock);
130 return -ENOENT;
131 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700132 hlist_del_init(&ax25_uid->uid_node);
133 ax25_uid_put(ax25_uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 write_unlock(&ax25_uid_lock);
135
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700136 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 default:
139 return -EINVAL;
140 }
141
142 return -EINVAL; /*NOTREACHED */
143}
144
145#ifdef CONFIG_PROC_FS
146
147static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetf16f3022008-01-13 22:29:41 -0800148 __acquires(ax25_uid_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 read_lock(&ax25_uid_lock);
Li Zefanb512f3d2010-02-08 23:19:59 +0000151 return seq_hlist_start_head(&ax25_uid_list, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
154static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
155{
Li Zefanb512f3d2010-02-08 23:19:59 +0000156 return seq_hlist_next(v, &ax25_uid_list, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
159static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetf16f3022008-01-13 22:29:41 -0800160 __releases(ax25_uid_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
162 read_unlock(&ax25_uid_lock);
163}
164
165static int ax25_uid_seq_show(struct seq_file *seq, void *v)
166{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700167 char buf[11];
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (v == SEQ_START_TOKEN)
170 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
171 else {
Li Zefanb512f3d2010-02-08 23:19:59 +0000172 struct ax25_uid_assoc *pt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Li Zefanb512f3d2010-02-08 23:19:59 +0000174 pt = hlist_entry(v, struct ax25_uid_assoc, uid_node);
Ralf Baechlef75268c2005-09-06 15:49:39 -0700175 seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177 return 0;
178}
179
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700180static const struct seq_operations ax25_uid_seqops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 .start = ax25_uid_seq_start,
182 .next = ax25_uid_seq_next,
183 .stop = ax25_uid_seq_stop,
184 .show = ax25_uid_seq_show,
185};
186
187static int ax25_uid_info_open(struct inode *inode, struct file *file)
188{
189 return seq_open(file, &ax25_uid_seqops);
190}
191
Arjan van de Ven9a321442007-02-12 00:55:35 -0800192const struct file_operations ax25_uid_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 .owner = THIS_MODULE,
194 .open = ax25_uid_info_open,
195 .read = seq_read,
196 .llseek = seq_lseek,
197 .release = seq_release,
198};
199
200#endif
201
202/*
203 * Free all memory associated with UID/Callsign structures.
204 */
205void __exit ax25_uid_free(void)
206{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700207 ax25_uid_assoc *ax25_uid;
208 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 write_lock(&ax25_uid_lock);
Pavel Emelyanovae1b6a32008-04-12 18:33:50 -0700211again:
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700212 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
213 hlist_del_init(&ax25_uid->uid_node);
214 ax25_uid_put(ax25_uid);
Pavel Emelyanovae1b6a32008-04-12 18:33:50 -0700215 goto again;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 write_unlock(&ax25_uid_lock);
218}