blob: 4c83137b59546ce01a767538a8d249796651c4ab [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>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040040#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <net/ip.h>
42#include <net/arp.h>
43
44/*
45 * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
46 */
47
Eric Dumazetf16f3022008-01-13 22:29:41 -080048static HLIST_HEAD(ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static DEFINE_RWLOCK(ax25_uid_lock);
50
Eric Dumazetf16f3022008-01-13 22:29:41 -080051int ax25_uid_policy;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Ralf Baechle70868ea2006-05-03 23:25:17 -070053EXPORT_SYMBOL(ax25_uid_policy);
54
Ralf Baechle01d7dd02005-08-23 10:11:45 -070055ax25_uid_assoc *ax25_findbyuid(uid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070057 ax25_uid_assoc *ax25_uid, *res = NULL;
58 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
60 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070061 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 if (ax25_uid->uid == uid) {
Ralf Baechle01d7dd02005-08-23 10:11:45 -070063 ax25_uid_hold(ax25_uid);
64 res = ax25_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 break;
66 }
67 }
68 read_unlock(&ax25_uid_lock);
69
Ralf Baechle01d7dd02005-08-23 10:11:45 -070070 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071}
72
Ralf Baechle70868ea2006-05-03 23:25:17 -070073EXPORT_SYMBOL(ax25_findbyuid);
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
76{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070077 ax25_uid_assoc *ax25_uid;
78 struct hlist_node *node;
79 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 unsigned long res;
81
82 switch (cmd) {
83 case SIOCAX25GETUID:
84 res = -ENOENT;
85 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070086 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
88 res = ax25_uid->uid;
89 break;
90 }
91 }
92 read_unlock(&ax25_uid_lock);
93
94 return res;
95
96 case SIOCAX25ADDUID:
97 if (!capable(CAP_NET_ADMIN))
98 return -EPERM;
Ralf Baechle01d7dd02005-08-23 10:11:45 -070099 user = ax25_findbyuid(sax->sax25_uid);
100 if (user) {
101 ax25_uid_put(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return -EEXIST;
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700103 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 if (sax->sax25_uid == 0)
105 return -EINVAL;
106 if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
107 return -ENOMEM;
108
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700109 atomic_set(&ax25_uid->refcount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 ax25_uid->uid = sax->sax25_uid;
111 ax25_uid->call = sax->sax25_call;
112
113 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700114 hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 write_unlock(&ax25_uid_lock);
116
117 return 0;
118
119 case SIOCAX25DELUID:
120 if (!capable(CAP_NET_ADMIN))
121 return -EPERM;
122
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700123 ax25_uid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700125 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
126 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 }
129 if (ax25_uid == NULL) {
130 write_unlock(&ax25_uid_lock);
131 return -ENOENT;
132 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700133 hlist_del_init(&ax25_uid->uid_node);
134 ax25_uid_put(ax25_uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 write_unlock(&ax25_uid_lock);
136
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700137 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 default:
140 return -EINVAL;
141 }
142
143 return -EINVAL; /*NOTREACHED */
144}
145
146#ifdef CONFIG_PROC_FS
147
148static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazetf16f3022008-01-13 22:29:41 -0800149 __acquires(ax25_uid_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 read_lock(&ax25_uid_lock);
Li Zefanb512f3d2010-02-08 23:19:59 +0000152 return seq_hlist_start_head(&ax25_uid_list, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153}
154
155static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
156{
Li Zefanb512f3d2010-02-08 23:19:59 +0000157 return seq_hlist_next(v, &ax25_uid_list, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
160static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
Eric Dumazetf16f3022008-01-13 22:29:41 -0800161 __releases(ax25_uid_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 read_unlock(&ax25_uid_lock);
164}
165
166static int ax25_uid_seq_show(struct seq_file *seq, void *v)
167{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700168 char buf[11];
169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (v == SEQ_START_TOKEN)
171 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
172 else {
Li Zefanb512f3d2010-02-08 23:19:59 +0000173 struct ax25_uid_assoc *pt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
Li Zefanb512f3d2010-02-08 23:19:59 +0000175 pt = hlist_entry(v, struct ax25_uid_assoc, uid_node);
Ralf Baechlef75268c2005-09-06 15:49:39 -0700176 seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
178 return 0;
179}
180
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700181static const struct seq_operations ax25_uid_seqops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 .start = ax25_uid_seq_start,
183 .next = ax25_uid_seq_next,
184 .stop = ax25_uid_seq_stop,
185 .show = ax25_uid_seq_show,
186};
187
188static int ax25_uid_info_open(struct inode *inode, struct file *file)
189{
190 return seq_open(file, &ax25_uid_seqops);
191}
192
Arjan van de Ven9a321442007-02-12 00:55:35 -0800193const struct file_operations ax25_uid_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 .owner = THIS_MODULE,
195 .open = ax25_uid_info_open,
196 .read = seq_read,
197 .llseek = seq_lseek,
198 .release = seq_release,
199};
200
201#endif
202
203/*
204 * Free all memory associated with UID/Callsign structures.
205 */
206void __exit ax25_uid_free(void)
207{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700208 ax25_uid_assoc *ax25_uid;
209 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
211 write_lock(&ax25_uid_lock);
Pavel Emelyanovae1b6a32008-04-12 18:33:50 -0700212again:
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700213 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
214 hlist_del_init(&ax25_uid->uid_node);
215 ax25_uid_put(ax25_uid);
Pavel Emelyanovae1b6a32008-04-12 18:33:50 -0700216 goto again;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 write_unlock(&ax25_uid_lock);
219}