Commit | Line | Data |
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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 | */ | |
4fc268d2 RD |
9 | |
10 | #include <linux/capability.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
29 | #include <linux/fcntl.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/interrupt.h> | |
01d7dd0e | 32 | #include <linux/list.h> |
1da177e4 LT |
33 | #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> | |
bc3b2d7f | 39 | #include <linux/export.h> |
1da177e4 LT |
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 | ||
f16f3026 | 47 | static HLIST_HEAD(ax25_uid_list); |
1da177e4 LT |
48 | static DEFINE_RWLOCK(ax25_uid_lock); |
49 | ||
f16f3026 | 50 | int ax25_uid_policy; |
1da177e4 | 51 | |
70868eac RB |
52 | EXPORT_SYMBOL(ax25_uid_policy); |
53 | ||
d13fda85 | 54 | ax25_uid_assoc *ax25_findbyuid(kuid_t uid) |
1da177e4 | 55 | { |
01d7dd0e RB |
56 | ax25_uid_assoc *ax25_uid, *res = NULL; |
57 | struct hlist_node *node; | |
1da177e4 LT |
58 | |
59 | read_lock(&ax25_uid_lock); | |
01d7dd0e | 60 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
d13fda85 | 61 | if (uid_eq(ax25_uid->uid, uid)) { |
01d7dd0e RB |
62 | ax25_uid_hold(ax25_uid); |
63 | res = ax25_uid; | |
1da177e4 LT |
64 | break; |
65 | } | |
66 | } | |
67 | read_unlock(&ax25_uid_lock); | |
68 | ||
01d7dd0e | 69 | return res; |
1da177e4 LT |
70 | } |
71 | ||
70868eac RB |
72 | EXPORT_SYMBOL(ax25_findbyuid); |
73 | ||
1da177e4 LT |
74 | int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax) |
75 | { | |
01d7dd0e RB |
76 | ax25_uid_assoc *ax25_uid; |
77 | struct hlist_node *node; | |
78 | ax25_uid_assoc *user; | |
1da177e4 LT |
79 | unsigned long res; |
80 | ||
81 | switch (cmd) { | |
82 | case SIOCAX25GETUID: | |
83 | res = -ENOENT; | |
84 | read_lock(&ax25_uid_lock); | |
01d7dd0e | 85 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
1da177e4 | 86 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) { |
d13fda85 | 87 | res = from_kuid_munged(current_user_ns(), ax25_uid->uid); |
1da177e4 LT |
88 | break; |
89 | } | |
90 | } | |
91 | read_unlock(&ax25_uid_lock); | |
92 | ||
93 | return res; | |
94 | ||
95 | case SIOCAX25ADDUID: | |
d13fda85 EB |
96 | { |
97 | kuid_t sax25_kuid; | |
1da177e4 LT |
98 | if (!capable(CAP_NET_ADMIN)) |
99 | return -EPERM; | |
d13fda85 EB |
100 | sax25_kuid = make_kuid(current_user_ns(), sax->sax25_uid); |
101 | if (!uid_valid(sax25_kuid)) | |
102 | return -EINVAL; | |
103 | user = ax25_findbyuid(sax25_kuid); | |
01d7dd0e RB |
104 | if (user) { |
105 | ax25_uid_put(user); | |
1da177e4 | 106 | return -EEXIST; |
01d7dd0e | 107 | } |
1da177e4 LT |
108 | if (sax->sax25_uid == 0) |
109 | return -EINVAL; | |
110 | if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL) | |
111 | return -ENOMEM; | |
112 | ||
01d7dd0e | 113 | atomic_set(&ax25_uid->refcount, 1); |
d13fda85 | 114 | ax25_uid->uid = sax25_kuid; |
1da177e4 LT |
115 | ax25_uid->call = sax->sax25_call; |
116 | ||
117 | write_lock(&ax25_uid_lock); | |
01d7dd0e | 118 | hlist_add_head(&ax25_uid->uid_node, &ax25_uid_list); |
1da177e4 LT |
119 | write_unlock(&ax25_uid_lock); |
120 | ||
121 | return 0; | |
d13fda85 | 122 | } |
1da177e4 LT |
123 | case SIOCAX25DELUID: |
124 | if (!capable(CAP_NET_ADMIN)) | |
125 | return -EPERM; | |
126 | ||
01d7dd0e | 127 | ax25_uid = NULL; |
1da177e4 | 128 | write_lock(&ax25_uid_lock); |
01d7dd0e RB |
129 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
130 | if (ax25cmp(&sax->sax25_call, &ax25_uid->call) == 0) | |
1da177e4 | 131 | break; |
1da177e4 LT |
132 | } |
133 | if (ax25_uid == NULL) { | |
134 | write_unlock(&ax25_uid_lock); | |
135 | return -ENOENT; | |
136 | } | |
01d7dd0e RB |
137 | hlist_del_init(&ax25_uid->uid_node); |
138 | ax25_uid_put(ax25_uid); | |
1da177e4 LT |
139 | write_unlock(&ax25_uid_lock); |
140 | ||
01d7dd0e | 141 | return 0; |
1da177e4 LT |
142 | |
143 | default: | |
144 | return -EINVAL; | |
145 | } | |
146 | ||
147 | return -EINVAL; /*NOTREACHED */ | |
148 | } | |
149 | ||
150 | #ifdef CONFIG_PROC_FS | |
151 | ||
152 | static void *ax25_uid_seq_start(struct seq_file *seq, loff_t *pos) | |
f16f3026 | 153 | __acquires(ax25_uid_lock) |
1da177e4 | 154 | { |
1da177e4 | 155 | read_lock(&ax25_uid_lock); |
b512f3d8 | 156 | return seq_hlist_start_head(&ax25_uid_list, *pos); |
1da177e4 LT |
157 | } |
158 | ||
159 | static void *ax25_uid_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
160 | { | |
b512f3d8 | 161 | return seq_hlist_next(v, &ax25_uid_list, pos); |
1da177e4 LT |
162 | } |
163 | ||
164 | static void ax25_uid_seq_stop(struct seq_file *seq, void *v) | |
f16f3026 | 165 | __releases(ax25_uid_lock) |
1da177e4 LT |
166 | { |
167 | read_unlock(&ax25_uid_lock); | |
168 | } | |
169 | ||
170 | static int ax25_uid_seq_show(struct seq_file *seq, void *v) | |
171 | { | |
f75268cd RB |
172 | char buf[11]; |
173 | ||
1da177e4 LT |
174 | if (v == SEQ_START_TOKEN) |
175 | seq_printf(seq, "Policy: %d\n", ax25_uid_policy); | |
176 | else { | |
b512f3d8 | 177 | struct ax25_uid_assoc *pt; |
1da177e4 | 178 | |
b512f3d8 | 179 | pt = hlist_entry(v, struct ax25_uid_assoc, uid_node); |
d13fda85 EB |
180 | seq_printf(seq, "%6d %s\n", |
181 | from_kuid_munged(seq_user_ns(seq), pt->uid), | |
182 | ax2asc(buf, &pt->call)); | |
1da177e4 LT |
183 | } |
184 | return 0; | |
185 | } | |
186 | ||
56b3d975 | 187 | static const struct seq_operations ax25_uid_seqops = { |
1da177e4 LT |
188 | .start = ax25_uid_seq_start, |
189 | .next = ax25_uid_seq_next, | |
190 | .stop = ax25_uid_seq_stop, | |
191 | .show = ax25_uid_seq_show, | |
192 | }; | |
193 | ||
194 | static int ax25_uid_info_open(struct inode *inode, struct file *file) | |
195 | { | |
196 | return seq_open(file, &ax25_uid_seqops); | |
197 | } | |
198 | ||
9a32144e | 199 | const struct file_operations ax25_uid_fops = { |
1da177e4 LT |
200 | .owner = THIS_MODULE, |
201 | .open = ax25_uid_info_open, | |
202 | .read = seq_read, | |
203 | .llseek = seq_lseek, | |
204 | .release = seq_release, | |
205 | }; | |
206 | ||
207 | #endif | |
208 | ||
209 | /* | |
210 | * Free all memory associated with UID/Callsign structures. | |
211 | */ | |
212 | void __exit ax25_uid_free(void) | |
213 | { | |
01d7dd0e RB |
214 | ax25_uid_assoc *ax25_uid; |
215 | struct hlist_node *node; | |
1da177e4 LT |
216 | |
217 | write_lock(&ax25_uid_lock); | |
ae1b6a31 | 218 | again: |
01d7dd0e RB |
219 | ax25_uid_for_each(ax25_uid, node, &ax25_uid_list) { |
220 | hlist_del_init(&ax25_uid->uid_node); | |
221 | ax25_uid_put(ax25_uid); | |
ae1b6a31 | 222 | goto again; |
1da177e4 | 223 | } |
1da177e4 LT |
224 | write_unlock(&ax25_uid_lock); |
225 | } |