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1f5a7e47 JB |
1 | /* |
2 | * Copyright 2002-2005, Instant802 Networks, Inc. | |
3 | * Copyright 2005-2006, Devicescape Software, Inc. | |
4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> | |
11a843b7 | 5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> |
1f5a7e47 JB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
11a843b7 JB |
12 | #include <linux/if_ether.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/list.h> | |
1f5a7e47 JB |
15 | #include <net/mac80211.h> |
16 | #include "ieee80211_i.h" | |
17 | #include "debugfs_key.h" | |
18 | #include "aes_ccm.h" | |
19 | ||
11a843b7 JB |
20 | |
21 | /* | |
22 | * Key handling basics | |
23 | * | |
24 | * Key handling in mac80211 is done based on per-interface (sub_if_data) | |
25 | * keys and per-station keys. Since each station belongs to an interface, | |
26 | * each station key also belongs to that interface. | |
27 | * | |
28 | * Hardware acceleration is done on a best-effort basis, for each key | |
29 | * that is eligible the hardware is asked to enable that key but if | |
30 | * it cannot do that they key is simply kept for software encryption. | |
31 | * There is currently no way of knowing this except by looking into | |
32 | * debugfs. | |
33 | * | |
34 | * All operations here are called under RTNL so no extra locking is | |
35 | * required. | |
36 | */ | |
37 | ||
38 | static const u8 bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF }; | |
39 | static const u8 zero_addr[ETH_ALEN]; | |
40 | ||
41 | static const u8 *get_mac_for_key(struct ieee80211_key *key) | |
42 | { | |
43 | const u8 *addr = bcast_addr; | |
44 | ||
45 | /* | |
46 | * If we're an AP we won't ever receive frames with a non-WEP | |
47 | * group key so we tell the driver that by using the zero MAC | |
48 | * address to indicate a transmit-only key. | |
49 | */ | |
50 | if (key->conf.alg != ALG_WEP && | |
51 | (key->sdata->type == IEEE80211_IF_TYPE_AP || | |
52 | key->sdata->type == IEEE80211_IF_TYPE_VLAN)) | |
53 | addr = zero_addr; | |
54 | ||
55 | if (key->sta) | |
56 | addr = key->sta->addr; | |
57 | ||
58 | return addr; | |
59 | } | |
60 | ||
61 | static void ieee80211_key_enable_hw_accel(struct ieee80211_key *key) | |
62 | { | |
63 | const u8 *addr; | |
64 | int ret; | |
65 | ||
66 | if (!key->local->ops->set_key) | |
67 | return; | |
68 | ||
69 | addr = get_mac_for_key(key); | |
70 | ||
71 | ret = key->local->ops->set_key(local_to_hw(key->local), SET_KEY, | |
72 | key->sdata->dev->dev_addr, addr, | |
73 | &key->conf); | |
74 | ||
75 | WARN_ON(!ret && (key->conf.hw_key_idx == HW_KEY_IDX_INVALID)); | |
76 | ||
77 | if (!ret) | |
78 | key->flags |= KEY_FLAG_UPLOADED_TO_HARDWARE; | |
79 | ||
80 | if (ret && ret != -ENOSPC && ret != -EOPNOTSUPP) | |
81 | printk(KERN_ERR "mac80211-%s: failed to set key " | |
82 | "(%d, " MAC_FMT ") to hardware (%d)\n", | |
83 | wiphy_name(key->local->hw.wiphy), | |
84 | key->conf.keyidx, MAC_ARG(addr), ret); | |
85 | } | |
86 | ||
87 | static void ieee80211_key_disable_hw_accel(struct ieee80211_key *key) | |
88 | { | |
89 | const u8 *addr; | |
90 | int ret; | |
91 | ||
92 | if (!key->local->ops->set_key) | |
93 | return; | |
94 | ||
95 | if (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
96 | return; | |
97 | ||
98 | addr = get_mac_for_key(key); | |
99 | ||
100 | ret = key->local->ops->set_key(local_to_hw(key->local), DISABLE_KEY, | |
101 | key->sdata->dev->dev_addr, addr, | |
102 | &key->conf); | |
103 | ||
104 | if (ret) | |
105 | printk(KERN_ERR "mac80211-%s: failed to remove key " | |
106 | "(%d, " MAC_FMT ") from hardware (%d)\n", | |
107 | wiphy_name(key->local->hw.wiphy), | |
108 | key->conf.keyidx, MAC_ARG(addr), ret); | |
109 | ||
110 | key->flags &= ~KEY_FLAG_UPLOADED_TO_HARDWARE; | |
111 | key->conf.hw_key_idx = HW_KEY_IDX_INVALID; | |
112 | } | |
113 | ||
1f5a7e47 | 114 | struct ieee80211_key *ieee80211_key_alloc(struct ieee80211_sub_if_data *sdata, |
11a843b7 JB |
115 | struct sta_info *sta, |
116 | ieee80211_key_alg alg, | |
117 | int idx, | |
118 | size_t key_len, | |
119 | const u8 *key_data) | |
1f5a7e47 JB |
120 | { |
121 | struct ieee80211_key *key; | |
122 | ||
11a843b7 JB |
123 | BUG_ON(alg == ALG_NONE); |
124 | ||
125 | key = kzalloc(sizeof(struct ieee80211_key) + key_len, GFP_KERNEL); | |
1f5a7e47 JB |
126 | if (!key) |
127 | return NULL; | |
11a843b7 JB |
128 | |
129 | /* | |
130 | * Default to software encryption; we'll later upload the | |
131 | * key to the hardware if possible. | |
132 | */ | |
133 | key->conf.hw_key_idx = HW_KEY_IDX_INVALID; | |
134 | key->conf.flags = 0; | |
135 | key->flags = 0; | |
136 | ||
137 | key->conf.alg = alg; | |
138 | key->conf.keyidx = idx; | |
139 | key->conf.keylen = key_len; | |
140 | memcpy(key->conf.key, key_data, key_len); | |
141 | ||
142 | key->local = sdata->local; | |
143 | key->sdata = sdata; | |
144 | key->sta = sta; | |
145 | ||
146 | if (alg == ALG_CCMP) { | |
147 | /* | |
148 | * Initialize AES key state here as an optimization so that | |
149 | * it does not need to be initialized for every packet. | |
150 | */ | |
151 | key->u.ccmp.tfm = ieee80211_aes_key_setup_encrypt(key_data); | |
152 | if (!key->u.ccmp.tfm) { | |
153 | ieee80211_key_free(key); | |
154 | return NULL; | |
155 | } | |
156 | } | |
157 | ||
158 | ieee80211_debugfs_key_add(key->local, key); | |
159 | ||
160 | if (sta) { | |
161 | ieee80211_debugfs_key_sta_link(key, sta); | |
162 | sta->key = key; | |
163 | /* | |
164 | * some hardware cannot handle TKIP with QoS, so | |
165 | * we indicate whether QoS could be in use. | |
166 | */ | |
167 | if (sta->flags & WLAN_STA_WME) | |
168 | key->conf.flags |= IEEE80211_KEY_FLAG_WMM_STA; | |
169 | } else { | |
170 | if (sdata->type == IEEE80211_IF_TYPE_STA) { | |
171 | struct sta_info *ap; | |
172 | ||
173 | /* same here, the AP could be using QoS */ | |
174 | ap = sta_info_get(key->local, key->sdata->u.sta.bssid); | |
175 | if (ap) { | |
176 | if (ap->flags & WLAN_STA_WME) | |
177 | key->conf.flags |= | |
178 | IEEE80211_KEY_FLAG_WMM_STA; | |
179 | sta_info_put(ap); | |
180 | } | |
181 | } | |
182 | ||
183 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) { | |
184 | if (!sdata->keys[idx]) | |
185 | sdata->keys[idx] = key; | |
186 | else | |
187 | WARN_ON(1); | |
188 | } else | |
189 | WARN_ON(1); | |
190 | } | |
191 | ||
192 | list_add(&key->list, &sdata->key_list); | |
193 | ||
194 | if (netif_running(key->sdata->dev)) | |
195 | ieee80211_key_enable_hw_accel(key); | |
196 | ||
1f5a7e47 JB |
197 | return key; |
198 | } | |
199 | ||
8f37171a | 200 | void ieee80211_key_free(struct ieee80211_key *key) |
1f5a7e47 | 201 | { |
8f37171a JB |
202 | if (!key) |
203 | return; | |
1f5a7e47 | 204 | |
11a843b7 JB |
205 | ieee80211_key_disable_hw_accel(key); |
206 | ||
207 | if (key->sta) { | |
208 | key->sta->key = NULL; | |
209 | } else { | |
210 | if (key->sdata->default_key == key) | |
211 | ieee80211_set_default_key(key->sdata, -1); | |
212 | if (key->conf.keyidx >= 0 && | |
213 | key->conf.keyidx < NUM_DEFAULT_KEYS) | |
214 | key->sdata->keys[key->conf.keyidx] = NULL; | |
215 | else | |
216 | WARN_ON(1); | |
217 | } | |
218 | ||
8f20fc24 | 219 | if (key->conf.alg == ALG_CCMP) |
1f5a7e47 JB |
220 | ieee80211_aes_key_free(key->u.ccmp.tfm); |
221 | ieee80211_debugfs_key_remove(key); | |
11a843b7 JB |
222 | |
223 | list_del(&key->list); | |
224 | ||
1f5a7e47 JB |
225 | kfree(key); |
226 | } | |
11a843b7 JB |
227 | |
228 | void ieee80211_set_default_key(struct ieee80211_sub_if_data *sdata, int idx) | |
229 | { | |
230 | struct ieee80211_key *key = NULL; | |
231 | ||
232 | if (idx >= 0 && idx < NUM_DEFAULT_KEYS) | |
233 | key = sdata->keys[idx]; | |
234 | ||
235 | if (sdata->default_key != key) { | |
236 | ieee80211_debugfs_key_remove_default(sdata); | |
237 | ||
238 | sdata->default_key = key; | |
239 | ||
240 | if (sdata->default_key) | |
241 | ieee80211_debugfs_key_add_default(sdata); | |
242 | ||
243 | if (sdata->local->ops->set_key_idx) | |
244 | sdata->local->ops->set_key_idx( | |
245 | local_to_hw(sdata->local), idx); | |
246 | } | |
247 | } | |
248 | ||
249 | void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata) | |
250 | { | |
251 | struct ieee80211_key *key, *tmp; | |
252 | ||
253 | list_for_each_entry_safe(key, tmp, &sdata->key_list, list) | |
254 | ieee80211_key_free(key); | |
255 | } | |
256 | ||
257 | void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata) | |
258 | { | |
259 | struct ieee80211_key *key; | |
260 | ||
261 | WARN_ON(!netif_running(sdata->dev)); | |
262 | if (!netif_running(sdata->dev)) | |
263 | return; | |
264 | ||
265 | list_for_each_entry(key, &sdata->key_list, list) | |
266 | ieee80211_key_enable_hw_accel(key); | |
267 | } | |
268 | ||
269 | void ieee80211_disable_keys(struct ieee80211_sub_if_data *sdata) | |
270 | { | |
271 | struct ieee80211_key *key; | |
272 | ||
273 | list_for_each_entry(key, &sdata->key_list, list) | |
274 | ieee80211_key_disable_hw_accel(key); | |
275 | } |