drivers/usb/host/ehci-fsl.c: add missing iounmap
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ax25 / ax25_uid.c
blob4c83137b59546ce01a767538a8d249796651c4ab
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.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
10 #include <linux/capability.h>
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/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.h>
20 #include <linux/spinlock.h>
21 #include <linux/slab.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>
33 #include <linux/list.h>
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 <linux/export.h>
41 #include <net/ip.h>
42 #include <net/arp.h>
45 * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines.
48 static HLIST_HEAD(ax25_uid_list);
49 static DEFINE_RWLOCK(ax25_uid_lock);
51 int ax25_uid_policy;
53 EXPORT_SYMBOL(ax25_uid_policy);
55 ax25_uid_assoc *ax25_findbyuid(uid_t uid)
57 ax25_uid_assoc *ax25_uid, *res = NULL;
58 struct hlist_node *node;
60 read_lock(&ax25_uid_lock);
61 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
62 if (ax25_uid->uid == uid) {
63 ax25_uid_hold(ax25_uid);
64 res = ax25_uid;
65 break;
68 read_unlock(&ax25_uid_lock);
70 return res;
73 EXPORT_SYMBOL(ax25_findbyuid);
75 int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
77 ax25_uid_assoc *ax25_uid;
78 struct hlist_node *node;
79 ax25_uid_assoc *user;
80 unsigned long res;
82 switch (cmd) {
83 case SIOCAX25GETUID:
84 res = -ENOENT;
85 read_lock(&ax25_uid_lock);
86 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
87 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) {
88 res = ax25_uid->uid;
89 break;
92 read_unlock(&ax25_uid_lock);
94 return res;
96 case SIOCAX25ADDUID:
97 if (!capable(CAP_NET_ADMIN))
98 return -EPERM;
99 user = ax25_findbyuid(sax->sax25_uid);
100 if (user) {
101 ax25_uid_put(user);
102 return -EEXIST;
104 if (sax->sax25_uid == 0)
105 return -EINVAL;
106 if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
107 return -ENOMEM;
109 atomic_set(&ax25_uid->refcount, 1);
110 ax25_uid->uid = sax->sax25_uid;
111 ax25_uid->call = sax->sax25_call;
113 write_lock(&ax25_uid_lock);
114 hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list);
115 write_unlock(&ax25_uid_lock);
117 return 0;
119 case SIOCAX25DELUID:
120 if (!capable(CAP_NET_ADMIN))
121 return -EPERM;
123 ax25_uid = NULL;
124 write_lock(&ax25_uid_lock);
125 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
126 if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0)
127 break;
129 if (ax25_uid == NULL) {
130 write_unlock(&ax25_uid_lock);
131 return -ENOENT;
133 hlist_del_init(&ax25_uid->uid_node);
134 ax25_uid_put(ax25_uid);
135 write_unlock(&ax25_uid_lock);
137 return 0;
139 default:
140 return -EINVAL;
143 return -EINVAL; /*NOTREACHED */
146 #ifdef CONFIG_PROC_FS
148 static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos)
149 __acquires(ax25_uid_lock)
151 read_lock(&ax25_uid_lock);
152 return seq_hlist_start_head(&ax25_uid_list, *pos);
155 static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos)
157 return seq_hlist_next(v, &ax25_uid_list, pos);
160 static void ax25_uid_seq_stop(struct seq_file *seq, void *v)
161 __releases(ax25_uid_lock)
163 read_unlock(&ax25_uid_lock);
166 static int ax25_uid_seq_show(struct seq_file *seq, void *v)
168 char buf[11];
170 if (v == SEQ_START_TOKEN)
171 seq_printf(seq, "Policy: %d\n", ax25_uid_policy);
172 else {
173 struct ax25_uid_assoc *pt;
175 pt = hlist_entry(v, struct ax25_uid_assoc, uid_node);
176 seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call));
178 return 0;
181 static const struct seq_operations ax25_uid_seqops = {
182 .start = ax25_uid_seq_start,
183 .next = ax25_uid_seq_next,
184 .stop = ax25_uid_seq_stop,
185 .show = ax25_uid_seq_show,
188 static int ax25_uid_info_open(struct inode *inode, struct file *file)
190 return seq_open(file, &ax25_uid_seqops);
193 const struct file_operations ax25_uid_fops = {
194 .owner = THIS_MODULE,
195 .open = ax25_uid_info_open,
196 .read = seq_read,
197 .llseek = seq_lseek,
198 .release = seq_release,
201 #endif
204 * Free all memory associated with UID/Callsign structures.
206 void __exit ax25_uid_free(void)
208 ax25_uid_assoc *ax25_uid;
209 struct hlist_node *node;
211 write_lock(&ax25_uid_lock);
212 again:
213 ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) {
214 hlist_del_init(&ax25_uid->uid_node);
215 ax25_uid_put(ax25_uid);
216 goto again;
218 write_unlock(&ax25_uid_lock);