blob: 75c76647b2cbdf62d0d76948d4558ec272d41cfa [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>
21#include <net/ax25.h>
22#include <linux/inet.h>
23#include <linux/netdevice.h>
24#include <linux/if_arp.h>
25#include <linux/skbuff.h>
26#include <net/sock.h>
27#include <asm/uaccess.h>
28#include <asm/system.h>
29#include <linux/fcntl.h>
30#include <linux/mm.h>
31#include <linux/interrupt.h>
Ralf Baechle01d7dd02005-08-23 10:11:45 -070032#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/notifier.h>
34#include <linux/proc_fs.h>
35#include <linux/seq_file.h>
36#include <linux/stat.h>
37#include <linux/netfilter.h>
38#include <linux/sysctl.h>
39#include <net/ip.h>
40#include <net/arp.h>
41
42/*
43 * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
44 */
45
Ralf Baechle01d7dd02005-08-23 10:11:45 -070046HLIST_HEAD(ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047static DEFINE_RWLOCK(ax25_uid_lock);
48
49int ax25_uid_policy = 0;
50
Ralf Baechle70868ea2006-05-03 23:25:17 -070051EXPORT_SYMBOL(ax25_uid_policy);
52
Ralf Baechle01d7dd02005-08-23 10:11:45 -070053ax25_uid_assoc *ax25_findbyuid(uid_t uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070055 ax25_uid_assoc *ax25_uid, *res = NULL;
56 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070059 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if (ax25_uid->uid == uid) {
Ralf Baechle01d7dd02005-08-23 10:11:45 -070061 ax25_uid_hold(ax25_uid);
62 res = ax25_uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 break;
64 }
65 }
66 read_unlock(&ax25_uid_lock);
67
Ralf Baechle01d7dd02005-08-23 10:11:45 -070068 return res;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069}
70
Ralf Baechle70868ea2006-05-03 23:25:17 -070071EXPORT_SYMBOL(ax25_findbyuid);
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
74{
Ralf Baechle01d7dd02005-08-23 10:11:45 -070075 ax25_uid_assoc *ax25_uid;
76 struct hlist_node *node;
77 ax25_uid_assoc *user;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 unsigned long res;
79
80 switch (cmd) {
81 case SIOCAX25GETUID:
82 res = -ENOENT;
83 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -070084 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
86 res = ax25_uid->uid;
87 break;
88 }
89 }
90 read_unlock(&ax25_uid_lock);
91
92 return res;
93
94 case SIOCAX25ADDUID:
95 if (!capable(CAP_NET_ADMIN))
96 return -EPERM;
Ralf Baechle01d7dd02005-08-23 10:11:45 -070097 user = ax25_findbyuid(sax->sax25_uid);
98 if (user) {
99 ax25_uid_put(user);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return -EEXIST;
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 if (sax->sax25_uid == 0)
103 return -EINVAL;
104 if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
105 return -ENOMEM;
106
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700107 atomic_set(&ax25_uid->refcount, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 ax25_uid->uid = sax->sax25_uid;
109 ax25_uid->call = sax->sax25_call;
110
111 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700112 hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 write_unlock(&ax25_uid_lock);
114
115 return 0;
116
117 case SIOCAX25DELUID:
118 if (!capable(CAP_NET_ADMIN))
119 return -EPERM;
120
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700121 ax25_uid = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700123 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
124 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
127 if (ax25_uid == NULL) {
128 write_unlock(&ax25_uid_lock);
129 return -ENOENT;
130 }
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700131 hlist_del_init(&ax25_uid->uid_node);
132 ax25_uid_put(ax25_uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 write_unlock(&ax25_uid_lock);
134
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700135 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137 default:
138 return -EINVAL;
139 }
140
141 return -EINVAL; /*NOTREACHED */
142}
143
144#ifdef CONFIG_PROC_FS
145
146static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
147{
148 struct ax25_uid_assoc *pt;
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700149 struct hlist_node *node;
150 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 read_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700153 ax25_uid_for_each(pt, node, &ax25_uid_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if (i == *pos)
155 return pt;
156 ++i;
157 }
158 return NULL;
159}
160
161static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
162{
163 ++*pos;
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700164
165 return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next,
YOSHIFUJI Hideaki528930b2007-02-09 23:24:31 +0900166 ax25_uid_assoc, uid_node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167}
168
169static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
170{
171 read_unlock(&ax25_uid_lock);
172}
173
174static int ax25_uid_seq_show(struct seq_file *seq, void *v)
175{
Ralf Baechlef75268c2005-09-06 15:49:39 -0700176 char buf[11];
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (v == SEQ_START_TOKEN)
179 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
180 else {
181 struct ax25_uid_assoc *pt = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
Ralf Baechlef75268c2005-09-06 15:49:39 -0700183 seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185 return 0;
186}
187
188static struct seq_operations ax25_uid_seqops = {
189 .start = ax25_uid_seq_start,
190 .next = ax25_uid_seq_next,
191 .stop = ax25_uid_seq_stop,
192 .show = ax25_uid_seq_show,
193};
194
195static int ax25_uid_info_open(struct inode *inode, struct file *file)
196{
197 return seq_open(file, &ax25_uid_seqops);
198}
199
Arjan van de Ven9a321442007-02-12 00:55:35 -0800200const struct file_operations ax25_uid_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 .owner = THIS_MODULE,
202 .open = ax25_uid_info_open,
203 .read = seq_read,
204 .llseek = seq_lseek,
205 .release = seq_release,
206};
207
208#endif
209
210/*
211 * Free all memory associated with UID/Callsign structures.
212 */
213void __exit ax25_uid_free(void)
214{
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700215 ax25_uid_assoc *ax25_uid;
216 struct hlist_node *node;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
218 write_lock(&ax25_uid_lock);
Ralf Baechle01d7dd02005-08-23 10:11:45 -0700219 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
220 hlist_del_init(&ax25_uid->uid_node);
221 ax25_uid_put(ax25_uid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 write_unlock(&ax25_uid_lock);
224}