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1da177e4 LT |
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. | |
6 | * | |
7 | * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) | |
8 | */ | |
9 | #include <linux/errno.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/socket.h> | |
12 | #include <linux/in.h> | |
13 | #include <linux/kernel.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/timer.h> | |
16 | #include <linux/string.h> | |
17 | #include <linux/sockios.h> | |
18 | #include <linux/net.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <net/ax25.h> | |
21 | #include <linux/inet.h> | |
22 | #include <linux/netdevice.h> | |
23 | #include <linux/if_arp.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <net/sock.h> | |
26 | #include <asm/uaccess.h> | |
27 | #include <asm/system.h> | |
28 | #include <linux/fcntl.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/interrupt.h> | |
01d7dd0e | 31 | #include <linux/list.h> |
1da177e4 LT |
32 | #include <linux/notifier.h> |
33 | #include <linux/proc_fs.h> | |
34 | #include <linux/seq_file.h> | |
35 | #include <linux/stat.h> | |
36 | #include <linux/netfilter.h> | |
37 | #include <linux/sysctl.h> | |
38 | #include <net/ip.h> | |
39 | #include <net/arp.h> | |
40 | ||
41 | /* | |
42 | * Callsign/UID mapper. This is in kernel space for security on multi-amateur machines. | |
43 | */ | |
44 | ||
01d7dd0e | 45 | HLIST_HEAD(ax25_uid_list); |
1da177e4 LT |
46 | static DEFINE_RWLOCK(ax25_uid_lock); |
47 | ||
48 | int ax25_uid_policy = 0; | |
49 | ||
01d7dd0e | 50 | ax25_uid_assoc *ax25_findbyuid(uid_t uid) |
1da177e4 | 51 | { |
01d7dd0e RB |
52 | ax25_uid_assoc *ax25_uid, *res = NULL; |
53 | struct hlist_node *node; | |
1da177e4 LT |
54 | |
55 | read_lock(&ax25_uid_lock); | |
01d7dd0e | 56 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
1da177e4 | 57 | if (ax25_uid->uid == uid) { |
01d7dd0e RB |
58 | ax25_uid_hold(ax25_uid); |
59 | res = ax25_uid; | |
1da177e4 LT |
60 | break; |
61 | } | |
62 | } | |
63 | read_unlock(&ax25_uid_lock); | |
64 | ||
01d7dd0e | 65 | return res; |
1da177e4 LT |
66 | } |
67 | ||
68 | int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) | |
69 | { | |
01d7dd0e RB |
70 | ax25_uid_assoc *ax25_uid; |
71 | struct hlist_node *node; | |
72 | ax25_uid_assoc *user; | |
1da177e4 LT |
73 | unsigned long res; |
74 | ||
75 | switch (cmd) { | |
76 | case SIOCAX25GETUID: | |
77 | res = -ENOENT; | |
78 | read_lock(&ax25_uid_lock); | |
01d7dd0e | 79 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
1da177e4 LT |
80 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { |
81 | res = ax25_uid->uid; | |
82 | break; | |
83 | } | |
84 | } | |
85 | read_unlock(&ax25_uid_lock); | |
86 | ||
87 | return res; | |
88 | ||
89 | case SIOCAX25ADDUID: | |
90 | if (!capable(CAP_NET_ADMIN)) | |
91 | return -EPERM; | |
01d7dd0e RB |
92 | user = ax25_findbyuid(sax->sax25_uid); |
93 | if (user) { | |
94 | ax25_uid_put(user); | |
1da177e4 | 95 | return -EEXIST; |
01d7dd0e | 96 | } |
1da177e4 LT |
97 | if (sax->sax25_uid == 0) |
98 | return -EINVAL; | |
99 | if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) | |
100 | return -ENOMEM; | |
101 | ||
01d7dd0e | 102 | atomic_set(&ax25_uid->refcount, 1); |
1da177e4 LT |
103 | ax25_uid->uid = sax->sax25_uid; |
104 | ax25_uid->call = sax->sax25_call; | |
105 | ||
106 | write_lock(&ax25_uid_lock); | |
01d7dd0e | 107 | hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); |
1da177e4 LT |
108 | write_unlock(&ax25_uid_lock); |
109 | ||
110 | return 0; | |
111 | ||
112 | case SIOCAX25DELUID: | |
113 | if (!capable(CAP_NET_ADMIN)) | |
114 | return -EPERM; | |
115 | ||
01d7dd0e | 116 | ax25_uid = NULL; |
1da177e4 | 117 | write_lock(&ax25_uid_lock); |
01d7dd0e RB |
118 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
119 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) | |
1da177e4 | 120 | break; |
1da177e4 LT |
121 | } |
122 | if (ax25_uid == NULL) { | |
123 | write_unlock(&ax25_uid_lock); | |
124 | return -ENOENT; | |
125 | } | |
01d7dd0e RB |
126 | hlist_del_init(&ax25_uid->uid_node); |
127 | ax25_uid_put(ax25_uid); | |
1da177e4 LT |
128 | write_unlock(&ax25_uid_lock); |
129 | ||
01d7dd0e | 130 | return 0; |
1da177e4 LT |
131 | |
132 | default: | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | return -EINVAL; /*NOTREACHED */ | |
137 | } | |
138 | ||
139 | #ifdef CONFIG_PROC_FS | |
140 | ||
141 | static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) | |
142 | { | |
143 | struct ax25_uid_assoc *pt; | |
01d7dd0e RB |
144 | struct hlist_node *node; |
145 | int i = 0; | |
1da177e4 LT |
146 | |
147 | read_lock(&ax25_uid_lock); | |
01d7dd0e | 148 | ax25_uid_for_each(pt, node, &ax25_uid_list) { |
1da177e4 LT |
149 | if (i == *pos) |
150 | return pt; | |
151 | ++i; | |
152 | } | |
153 | return NULL; | |
154 | } | |
155 | ||
156 | static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
157 | { | |
158 | ++*pos; | |
01d7dd0e RB |
159 | |
160 | return hlist_entry(((ax25_uid_assoc *)v)->uid_node.next, | |
161 | ax25_uid_assoc, uid_node); | |
1da177e4 LT |
162 | } |
163 | ||
164 | static void ax25_uid_seq_stop(struct seq_file *seq, void *v) | |
165 | { | |
166 | read_unlock(&ax25_uid_lock); | |
167 | } | |
168 | ||
169 | static int ax25_uid_seq_show(struct seq_file *seq, void *v) | |
170 | { | |
f75268cd RB |
171 | char buf[11]; |
172 | ||
1da177e4 LT |
173 | if (v == SEQ_START_TOKEN) |
174 | seq_printf(seq, "Policy: %d\n", ax25_uid_policy); | |
175 | else { | |
176 | struct ax25_uid_assoc *pt = v; | |
1da177e4 | 177 | |
f75268cd | 178 | seq_printf(seq, "%6d %s\n", pt->uid, ax2asc(buf, &pt->call)); |
1da177e4 LT |
179 | } |
180 | return 0; | |
181 | } | |
182 | ||
183 | static struct seq_operations ax25_uid_seqops = { | |
184 | .start = ax25_uid_seq_start, | |
185 | .next = ax25_uid_seq_next, | |
186 | .stop = ax25_uid_seq_stop, | |
187 | .show = ax25_uid_seq_show, | |
188 | }; | |
189 | ||
190 | static int ax25_uid_info_open(struct inode *inode, struct file *file) | |
191 | { | |
192 | return seq_open(file, &ax25_uid_seqops); | |
193 | } | |
194 | ||
195 | struct file_operations ax25_uid_fops = { | |
196 | .owner = THIS_MODULE, | |
197 | .open = ax25_uid_info_open, | |
198 | .read = seq_read, | |
199 | .llseek = seq_lseek, | |
200 | .release = seq_release, | |
201 | }; | |
202 | ||
203 | #endif | |
204 | ||
205 | /* | |
206 | * Free all memory associated with UID/Callsign structures. | |
207 | */ | |
208 | void __exit ax25_uid_free(void) | |
209 | { | |
01d7dd0e RB |
210 | ax25_uid_assoc *ax25_uid; |
211 | struct hlist_node *node; | |
1da177e4 LT |
212 | |
213 | write_lock(&ax25_uid_lock); | |
01d7dd0e RB |
214 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
215 | hlist_del_init(&ax25_uid->uid_node); | |
216 | ax25_uid_put(ax25_uid); | |
1da177e4 | 217 | } |
1da177e4 LT |
218 | write_unlock(&ax25_uid_lock); |
219 | } |