xref: /openbmc/linux/net/mac80211/debugfs_key.c (revision 22246614)
1 /*
2  * Copyright 2003-2005	Devicescape Software, Inc.
3  * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
4  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/kobject.h>
12 #include "ieee80211_i.h"
13 #include "key.h"
14 #include "debugfs.h"
15 #include "debugfs_key.h"
16 
17 #define KEY_READ(name, prop, buflen, format_string)			\
18 static ssize_t key_##name##_read(struct file *file,			\
19 				 char __user *userbuf,			\
20 				 size_t count, loff_t *ppos)		\
21 {									\
22 	char buf[buflen];						\
23 	struct ieee80211_key *key = file->private_data;			\
24 	int res = scnprintf(buf, buflen, format_string, key->prop);	\
25 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);	\
26 }
27 #define KEY_READ_D(name) KEY_READ(name, name, 20, "%d\n")
28 #define KEY_READ_X(name) KEY_READ(name, name, 20, "0x%x\n")
29 
30 #define KEY_OPS(name)							\
31 static const struct file_operations key_ ##name## _ops = {		\
32 	.read = key_##name##_read,					\
33 	.open = mac80211_open_file_generic,				\
34 }
35 
36 #define KEY_FILE(name, format)						\
37 		 KEY_READ_##format(name)				\
38 		 KEY_OPS(name)
39 
40 #define KEY_CONF_READ(name, buflen, format_string)			\
41 	KEY_READ(conf_##name, conf.name, buflen, format_string)
42 #define KEY_CONF_READ_D(name) KEY_CONF_READ(name, 20, "%d\n")
43 
44 #define KEY_CONF_OPS(name)						\
45 static const struct file_operations key_ ##name## _ops = {		\
46 	.read = key_conf_##name##_read,					\
47 	.open = mac80211_open_file_generic,				\
48 }
49 
50 #define KEY_CONF_FILE(name, format)					\
51 		 KEY_CONF_READ_##format(name)				\
52 		 KEY_CONF_OPS(name)
53 
54 KEY_CONF_FILE(keylen, D);
55 KEY_CONF_FILE(keyidx, D);
56 KEY_CONF_FILE(hw_key_idx, D);
57 KEY_FILE(flags, X);
58 KEY_FILE(tx_rx_count, D);
59 KEY_READ(ifindex, sdata->dev->ifindex, 20, "%d\n");
60 KEY_OPS(ifindex);
61 
62 static ssize_t key_algorithm_read(struct file *file,
63 				  char __user *userbuf,
64 				  size_t count, loff_t *ppos)
65 {
66 	char *alg;
67 	struct ieee80211_key *key = file->private_data;
68 
69 	switch (key->conf.alg) {
70 	case ALG_WEP:
71 		alg = "WEP\n";
72 		break;
73 	case ALG_TKIP:
74 		alg = "TKIP\n";
75 		break;
76 	case ALG_CCMP:
77 		alg = "CCMP\n";
78 		break;
79 	default:
80 		return 0;
81 	}
82 	return simple_read_from_buffer(userbuf, count, ppos, alg, strlen(alg));
83 }
84 KEY_OPS(algorithm);
85 
86 static ssize_t key_tx_spec_read(struct file *file, char __user *userbuf,
87 				size_t count, loff_t *ppos)
88 {
89 	const u8 *tpn;
90 	char buf[20];
91 	int len;
92 	struct ieee80211_key *key = file->private_data;
93 
94 	switch (key->conf.alg) {
95 	case ALG_WEP:
96 		len = scnprintf(buf, sizeof(buf), "\n");
97 		break;
98 	case ALG_TKIP:
99 		len = scnprintf(buf, sizeof(buf), "%08x %04x\n",
100 				key->u.tkip.iv32,
101 				key->u.tkip.iv16);
102 		break;
103 	case ALG_CCMP:
104 		tpn = key->u.ccmp.tx_pn;
105 		len = scnprintf(buf, sizeof(buf), "%02x%02x%02x%02x%02x%02x\n",
106 				tpn[0], tpn[1], tpn[2], tpn[3], tpn[4], tpn[5]);
107 		break;
108 	default:
109 		return 0;
110 	}
111 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
112 }
113 KEY_OPS(tx_spec);
114 
115 static ssize_t key_rx_spec_read(struct file *file, char __user *userbuf,
116 				size_t count, loff_t *ppos)
117 {
118 	struct ieee80211_key *key = file->private_data;
119 	char buf[14*NUM_RX_DATA_QUEUES+1], *p = buf;
120 	int i, len;
121 	const u8 *rpn;
122 
123 	switch (key->conf.alg) {
124 	case ALG_WEP:
125 		len = scnprintf(buf, sizeof(buf), "\n");
126 		break;
127 	case ALG_TKIP:
128 		for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
129 			p += scnprintf(p, sizeof(buf)+buf-p,
130 				       "%08x %04x\n",
131 				       key->u.tkip.iv32_rx[i],
132 				       key->u.tkip.iv16_rx[i]);
133 		len = p - buf;
134 		break;
135 	case ALG_CCMP:
136 		for (i = 0; i < NUM_RX_DATA_QUEUES; i++) {
137 			rpn = key->u.ccmp.rx_pn[i];
138 			p += scnprintf(p, sizeof(buf)+buf-p,
139 				       "%02x%02x%02x%02x%02x%02x\n",
140 				       rpn[0], rpn[1], rpn[2],
141 				       rpn[3], rpn[4], rpn[5]);
142 		}
143 		len = p - buf;
144 		break;
145 	default:
146 		return 0;
147 	}
148 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
149 }
150 KEY_OPS(rx_spec);
151 
152 static ssize_t key_replays_read(struct file *file, char __user *userbuf,
153 				size_t count, loff_t *ppos)
154 {
155 	struct ieee80211_key *key = file->private_data;
156 	char buf[20];
157 	int len;
158 
159 	if (key->conf.alg != ALG_CCMP)
160 		return 0;
161 	len = scnprintf(buf, sizeof(buf), "%u\n", key->u.ccmp.replays);
162 	return simple_read_from_buffer(userbuf, count, ppos, buf, len);
163 }
164 KEY_OPS(replays);
165 
166 static ssize_t key_key_read(struct file *file, char __user *userbuf,
167 			    size_t count, loff_t *ppos)
168 {
169 	struct ieee80211_key *key = file->private_data;
170 	int i, res, bufsize = 2 * key->conf.keylen + 2;
171 	char *buf = kmalloc(bufsize, GFP_KERNEL);
172 	char *p = buf;
173 
174 	for (i = 0; i < key->conf.keylen; i++)
175 		p += scnprintf(p, bufsize + buf - p, "%02x", key->conf.key[i]);
176 	p += scnprintf(p, bufsize+buf-p, "\n");
177 	res = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
178 	kfree(buf);
179 	return res;
180 }
181 KEY_OPS(key);
182 
183 #define DEBUGFS_ADD(name) \
184 	key->debugfs.name = debugfs_create_file(#name, 0400,\
185 				key->debugfs.dir, key, &key_##name##_ops);
186 
187 void ieee80211_debugfs_key_add(struct ieee80211_key *key)
188   {
189 	static int keycount;
190 	char buf[50];
191 	DECLARE_MAC_BUF(mac);
192 	struct sta_info *sta;
193 
194 	if (!key->local->debugfs.keys)
195 		return;
196 
197 	sprintf(buf, "%d", keycount);
198 	key->debugfs.cnt = keycount;
199 	keycount++;
200 	key->debugfs.dir = debugfs_create_dir(buf,
201 					key->local->debugfs.keys);
202 
203 	if (!key->debugfs.dir)
204 		return;
205 
206 	rcu_read_lock();
207 	sta = rcu_dereference(key->sta);
208 	if (sta)
209 		sprintf(buf, "../../stations/%s", print_mac(mac, sta->addr));
210 	rcu_read_unlock();
211 
212 	/* using sta as a boolean is fine outside RCU lock */
213 	if (sta)
214 		key->debugfs.stalink =
215 			debugfs_create_symlink("station", key->debugfs.dir, buf);
216 
217 	DEBUGFS_ADD(keylen);
218 	DEBUGFS_ADD(flags);
219 	DEBUGFS_ADD(keyidx);
220 	DEBUGFS_ADD(hw_key_idx);
221 	DEBUGFS_ADD(tx_rx_count);
222 	DEBUGFS_ADD(algorithm);
223 	DEBUGFS_ADD(tx_spec);
224 	DEBUGFS_ADD(rx_spec);
225 	DEBUGFS_ADD(replays);
226 	DEBUGFS_ADD(key);
227 	DEBUGFS_ADD(ifindex);
228 };
229 
230 #define DEBUGFS_DEL(name) \
231 	debugfs_remove(key->debugfs.name); key->debugfs.name = NULL;
232 
233 void ieee80211_debugfs_key_remove(struct ieee80211_key *key)
234 {
235 	if (!key)
236 		return;
237 
238 	DEBUGFS_DEL(keylen);
239 	DEBUGFS_DEL(flags);
240 	DEBUGFS_DEL(keyidx);
241 	DEBUGFS_DEL(hw_key_idx);
242 	DEBUGFS_DEL(tx_rx_count);
243 	DEBUGFS_DEL(algorithm);
244 	DEBUGFS_DEL(tx_spec);
245 	DEBUGFS_DEL(rx_spec);
246 	DEBUGFS_DEL(replays);
247 	DEBUGFS_DEL(key);
248 	DEBUGFS_DEL(ifindex);
249 
250 	debugfs_remove(key->debugfs.stalink);
251 	key->debugfs.stalink = NULL;
252 	debugfs_remove(key->debugfs.dir);
253 	key->debugfs.dir = NULL;
254 }
255 void ieee80211_debugfs_key_add_default(struct ieee80211_sub_if_data *sdata)
256 {
257 	char buf[50];
258 	struct ieee80211_key *key;
259 
260 	if (!sdata->debugfsdir)
261 		return;
262 
263 	/* this is running under the key lock */
264 
265 	key = sdata->default_key;
266 	if (key) {
267 		sprintf(buf, "../keys/%d", key->debugfs.cnt);
268 		sdata->debugfs.default_key =
269 			debugfs_create_symlink("default_key",
270 					       sdata->debugfsdir, buf);
271 	} else
272 		ieee80211_debugfs_key_remove_default(sdata);
273 }
274 
275 void ieee80211_debugfs_key_remove_default(struct ieee80211_sub_if_data *sdata)
276 {
277 	if (!sdata)
278 		return;
279 
280 	debugfs_remove(sdata->debugfs.default_key);
281 	sdata->debugfs.default_key = NULL;
282 }
283 
284 void ieee80211_debugfs_key_sta_del(struct ieee80211_key *key,
285 				   struct sta_info *sta)
286 {
287 	debugfs_remove(key->debugfs.stalink);
288 	key->debugfs.stalink = NULL;
289 }
290