Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
765cb46a | 3 | * Copyright 2008, Jouni Malinen <j@w1.fi> |
f0706e82 JB |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/netdevice.h> | |
11 | #include <linux/types.h> | |
f0706e82 JB |
12 | #include <linux/skbuff.h> |
13 | #include <linux/compiler.h> | |
f14df804 | 14 | #include <linux/ieee80211.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
f14df804 | 16 | #include <asm/unaligned.h> |
f0706e82 | 17 | #include <net/mac80211.h> |
aba83a0b | 18 | #include <crypto/aes.h> |
eb063c17 | 19 | |
f0706e82 JB |
20 | #include "ieee80211_i.h" |
21 | #include "michael.h" | |
22 | #include "tkip.h" | |
23 | #include "aes_ccm.h" | |
765cb46a | 24 | #include "aes_cmac.h" |
f0706e82 JB |
25 | #include "wpa.h" |
26 | ||
9ae54c84 | 27 | ieee80211_tx_result |
5cf121c3 | 28 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 29 | { |
747d753d | 30 | u8 *data, *key, *mic; |
f0706e82 | 31 | size_t data_len; |
8e8862b7 HH |
32 | unsigned int hdrlen; |
33 | struct ieee80211_hdr *hdr; | |
f0706e82 | 34 | struct sk_buff *skb = tx->skb; |
813d7669 | 35 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 36 | int tail; |
f0706e82 | 37 | |
c34498b9 | 38 | hdr = (struct ieee80211_hdr *)skb->data; |
97359d12 JB |
39 | if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
40 | skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 41 | return TX_CONTINUE; |
f0706e82 | 42 | |
8e8862b7 HH |
43 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
44 | if (skb->len < hdrlen) | |
9ae54c84 | 45 | return TX_DROP; |
f0706e82 | 46 | |
8e8862b7 HH |
47 | data = skb->data + hdrlen; |
48 | data_len = skb->len - hdrlen; | |
49 | ||
681d1190 JM |
50 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { |
51 | /* Need to use software crypto for the test */ | |
52 | info->control.hw_key = NULL; | |
53 | } | |
54 | ||
813d7669 | 55 | if (info->control.hw_key && |
a26eb27a JB |
56 | (info->flags & IEEE80211_TX_CTL_DONTFRAG || |
57 | tx->local->ops->set_frag_threshold) && | |
813d7669 JB |
58 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { |
59 | /* hwaccel - with no need for SW-generated MMIC */ | |
9ae54c84 | 60 | return TX_CONTINUE; |
f0706e82 JB |
61 | } |
62 | ||
23c0752a | 63 | tail = MICHAEL_MIC_LEN; |
813d7669 | 64 | if (!info->control.hw_key) |
4325f6ca | 65 | tail += IEEE80211_TKIP_ICV_LEN; |
23c0752a | 66 | |
b1e9be87 JB |
67 | if (WARN(skb_tailroom(skb) < tail || |
68 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN, | |
69 | "mmic: not enough head/tail (%d/%d,%d/%d)\n", | |
70 | skb_headroom(skb), IEEE80211_TKIP_IV_LEN, | |
71 | skb_tailroom(skb), tail)) | |
23c0752a | 72 | return TX_DROP; |
f0706e82 | 73 | |
747d753d | 74 | key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; |
f0706e82 | 75 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 76 | michael_mic(key, hdr, data, data_len, mic); |
681d1190 JM |
77 | if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) |
78 | mic[0]++; | |
f0706e82 | 79 | |
9ae54c84 | 80 | return TX_CONTINUE; |
f0706e82 JB |
81 | } |
82 | ||
83 | ||
9ae54c84 | 84 | ieee80211_rx_result |
5cf121c3 | 85 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 86 | { |
747d753d | 87 | u8 *data, *key = NULL; |
f0706e82 | 88 | size_t data_len; |
8e8862b7 | 89 | unsigned int hdrlen; |
f0706e82 JB |
90 | u8 mic[MICHAEL_MIC_LEN]; |
91 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 JB |
92 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
93 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 94 | |
816c04fe CL |
95 | /* |
96 | * it makes no sense to check for MIC errors on anything other | |
97 | * than data frames. | |
98 | */ | |
99 | if (!ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 100 | return RX_CONTINUE; |
f0706e82 | 101 | |
816c04fe CL |
102 | /* |
103 | * No way to verify the MIC if the hardware stripped it or | |
104 | * the IV with the key index. In this case we have solely rely | |
105 | * on the driver to set RX_FLAG_MMIC_ERROR in the event of a | |
106 | * MIC failure report. | |
107 | */ | |
108 | if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { | |
109 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
b98ea058 | 110 | goto mic_fail_no_key; |
816c04fe | 111 | |
4045f72b SG |
112 | if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && |
113 | rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) | |
816c04fe CL |
114 | goto update_iv; |
115 | ||
116 | return RX_CONTINUE; | |
117 | } | |
118 | ||
119 | /* | |
120 | * Some hardware seems to generate Michael MIC failure reports; even | |
121 | * though, the frame was not encrypted with TKIP and therefore has no | |
122 | * MIC. Ignore the flag them to avoid triggering countermeasures. | |
123 | */ | |
97359d12 | 124 | if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || |
816c04fe | 125 | !(status->flag & RX_FLAG_DECRYPTED)) |
9ae54c84 | 126 | return RX_CONTINUE; |
f0706e82 | 127 | |
816c04fe CL |
128 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { |
129 | /* | |
130 | * APs with pairwise keys should never receive Michael MIC | |
131 | * errors for non-zero keyidx because these are reserved for | |
132 | * group keys and only the AP is sending real multicast | |
87ee475e | 133 | * frames in the BSS. |
816c04fe CL |
134 | */ |
135 | return RX_DROP_UNUSABLE; | |
136 | } | |
137 | ||
138 | if (status->flag & RX_FLAG_MMIC_ERROR) | |
139 | goto mic_fail; | |
140 | ||
8e8862b7 HH |
141 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
142 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 143 | return RX_DROP_UNUSABLE; |
f0706e82 | 144 | |
a8286911 JB |
145 | if (skb_linearize(rx->skb)) |
146 | return RX_DROP_UNUSABLE; | |
147 | hdr = (void *)skb->data; | |
148 | ||
8e8862b7 HH |
149 | data = skb->data + hdrlen; |
150 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
747d753d | 151 | key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; |
8e8862b7 | 152 | michael_mic(key, hdr, data, data_len, mic); |
816c04fe CL |
153 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) |
154 | goto mic_fail; | |
f0706e82 | 155 | |
f0706e82 JB |
156 | /* remove Michael MIC from payload */ |
157 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
158 | ||
816c04fe | 159 | update_iv: |
50741ae0 | 160 | /* update IV in key information to be able to detect replays */ |
9e26297a JB |
161 | rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; |
162 | rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; | |
50741ae0 | 163 | |
9ae54c84 | 164 | return RX_CONTINUE; |
816c04fe CL |
165 | |
166 | mic_fail: | |
b98ea058 S |
167 | rx->key->u.tkip.mic_failures++; |
168 | ||
169 | mic_fail_no_key: | |
a66b98db AN |
170 | /* |
171 | * In some cases the key can be unset - e.g. a multicast packet, in | |
172 | * a driver that supports HW encryption. Send up the key idx only if | |
173 | * the key is set. | |
174 | */ | |
175 | mac80211_ev_michael_mic_failure(rx->sdata, | |
176 | rx->key ? rx->key->conf.keyidx : -1, | |
816c04fe CL |
177 | (void *) skb->data, NULL, GFP_ATOMIC); |
178 | return RX_DROP_UNUSABLE; | |
f0706e82 JB |
179 | } |
180 | ||
181 | ||
e039fa4a | 182 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
183 | { |
184 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
185 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 186 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
187 | unsigned int hdrlen; |
188 | int len, tail; | |
f0706e82 JB |
189 | u8 *pos; |
190 | ||
813d7669 | 191 | if (info->control.hw_key && |
ee70108f JD |
192 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
193 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
813d7669 | 194 | /* hwaccel - with no need for software-generated IV */ |
23c0752a | 195 | return 0; |
e039fa4a JB |
196 | } |
197 | ||
d5184cac | 198 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
199 | len = skb->len - hdrlen; |
200 | ||
813d7669 | 201 | if (info->control.hw_key) |
23c0752a | 202 | tail = 0; |
11a843b7 | 203 | else |
4325f6ca | 204 | tail = IEEE80211_TKIP_ICV_LEN; |
23c0752a JB |
205 | |
206 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 207 | skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) |
23c0752a | 208 | return -1; |
f0706e82 | 209 | |
4325f6ca JB |
210 | pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); |
211 | memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); | |
f0706e82 JB |
212 | pos += hdrlen; |
213 | ||
ee70108f JD |
214 | /* the HW only needs room for the IV, but not the actual IV */ |
215 | if (info->control.hw_key && | |
216 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
217 | return 0; | |
218 | ||
f0706e82 | 219 | /* Increase IV for the frame */ |
03395003 | 220 | spin_lock(&key->u.tkip.txlock); |
b0f76b33 HH |
221 | key->u.tkip.tx.iv16++; |
222 | if (key->u.tkip.tx.iv16 == 0) | |
223 | key->u.tkip.tx.iv32++; | |
523b02ea | 224 | pos = ieee80211_tkip_add_iv(pos, key); |
03395003 | 225 | spin_unlock(&key->u.tkip.txlock); |
f0706e82 | 226 | |
813d7669 JB |
227 | /* hwaccel - with software IV */ |
228 | if (info->control.hw_key) | |
f0706e82 | 229 | return 0; |
f0706e82 JB |
230 | |
231 | /* Add room for ICV */ | |
4325f6ca | 232 | skb_put(skb, IEEE80211_TKIP_ICV_LEN); |
f0706e82 | 233 | |
3473187d | 234 | return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, |
523b02ea | 235 | key, skb, pos, len); |
f0706e82 JB |
236 | } |
237 | ||
238 | ||
9ae54c84 | 239 | ieee80211_tx_result |
5cf121c3 | 240 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 241 | { |
252b86c4 | 242 | struct sk_buff *skb; |
f0706e82 | 243 | |
5cf121c3 | 244 | ieee80211_tx_set_protected(tx); |
f0706e82 | 245 | |
252b86c4 | 246 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
247 | if (tkip_encrypt_skb(tx, skb) < 0) |
248 | return TX_DROP; | |
252b86c4 | 249 | } |
f0706e82 | 250 | |
9ae54c84 | 251 | return TX_CONTINUE; |
f0706e82 JB |
252 | } |
253 | ||
254 | ||
9ae54c84 | 255 | ieee80211_rx_result |
5cf121c3 | 256 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
257 | { |
258 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
747d753d | 259 | int hdrlen, res, hwaccel = 0; |
f0706e82 JB |
260 | struct ieee80211_key *key = rx->key; |
261 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 262 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
f0706e82 | 263 | |
d5184cac | 264 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 265 | |
c34498b9 | 266 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 267 | return RX_CONTINUE; |
f0706e82 JB |
268 | |
269 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 270 | return RX_DROP_UNUSABLE; |
f0706e82 | 271 | |
a8286911 JB |
272 | /* it may be possible to optimize this a bit more */ |
273 | if (skb_linearize(rx->skb)) | |
274 | return RX_DROP_UNUSABLE; | |
275 | hdr = (void *)skb->data; | |
276 | ||
dc1580dd JB |
277 | /* |
278 | * Let TKIP code verify IV, but skip decryption. | |
279 | * In the case where hardware checks the IV as well, | |
280 | * we don't even get here, see ieee80211_rx_h_decrypt() | |
281 | */ | |
282 | if (status->flag & RX_FLAG_DECRYPTED) | |
f0706e82 | 283 | hwaccel = 1; |
f0706e82 JB |
284 | |
285 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
286 | key, skb->data + hdrlen, | |
17741cdc | 287 | skb->len - hdrlen, rx->sta->sta.addr, |
9e26297a | 288 | hdr->addr1, hwaccel, rx->security_idx, |
5cf121c3 JB |
289 | &rx->tkip_iv32, |
290 | &rx->tkip_iv16); | |
747d753d | 291 | if (res != TKIP_DECRYPT_OK) |
e4c26add | 292 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
293 | |
294 | /* Trim ICV */ | |
4325f6ca | 295 | skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); |
f0706e82 JB |
296 | |
297 | /* Remove IV */ | |
4325f6ca JB |
298 | memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); |
299 | skb_pull(skb, IEEE80211_TKIP_IV_LEN); | |
f0706e82 | 300 | |
9ae54c84 | 301 | return RX_CONTINUE; |
f0706e82 JB |
302 | } |
303 | ||
304 | ||
30ef7ef9 | 305 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) |
f0706e82 | 306 | { |
f14df804 | 307 | __le16 mask_fc; |
fb733336 | 308 | int a4_included, mgmt; |
f14df804 | 309 | u8 qos_tid; |
7ec7c4a9 | 310 | u16 len_a; |
f14df804 HH |
311 | unsigned int hdrlen; |
312 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 313 | |
f14df804 | 314 | /* |
fb733336 | 315 | * Mask FC: zero subtype b4 b5 b6 (if not mgmt) |
f14df804 HH |
316 | * Retry, PwrMgt, MoreData; set Protected |
317 | */ | |
fb733336 | 318 | mgmt = ieee80211_is_mgmt(hdr->frame_control); |
f14df804 | 319 | mask_fc = hdr->frame_control; |
fb733336 | 320 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | |
f14df804 | 321 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); |
fb733336 JM |
322 | if (!mgmt) |
323 | mask_fc &= ~cpu_to_le16(0x0070); | |
f14df804 HH |
324 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
325 | ||
326 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
327 | len_a = hdrlen - 2; | |
328 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 329 | |
f14df804 HH |
330 | if (ieee80211_is_data_qos(hdr->frame_control)) |
331 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
332 | else | |
333 | qos_tid = 0; | |
334 | ||
7ec7c4a9 AB |
335 | /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC |
336 | * mode authentication are not allowed to collide, yet both are derived | |
337 | * from this vector b_0. We only set L := 1 here to indicate that the | |
338 | * data size can be represented in (L+1) bytes. The CCM layer will take | |
339 | * care of storing the data length in the top (L+1) bytes and setting | |
340 | * and clearing the other bits as is required to derive the two IVs. | |
341 | */ | |
342 | b_0[0] = 0x1; | |
f14df804 | 343 | |
fb733336 JM |
344 | /* Nonce: Nonce Flags | A2 | PN |
345 | * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) | |
346 | */ | |
347 | b_0[1] = qos_tid | (mgmt << 4); | |
73e1f7c8 | 348 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
4325f6ca | 349 | memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
350 | |
351 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
352 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
353 | put_unaligned_be16(len_a, &aad[0]); |
354 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 355 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
356 | |
357 | /* Mask Seq#, leave Frag# */ | |
358 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
359 | aad[23] = 0; | |
f14df804 | 360 | |
f0706e82 | 361 | if (a4_included) { |
73e1f7c8 | 362 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 363 | aad[30] = qos_tid; |
f0706e82 | 364 | aad[31] = 0; |
f14df804 | 365 | } else { |
73e1f7c8 | 366 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 367 | aad[24] = qos_tid; |
f0706e82 JB |
368 | } |
369 | } | |
370 | ||
371 | ||
372 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
373 | { | |
374 | hdr[0] = pn[5]; | |
375 | hdr[1] = pn[4]; | |
376 | hdr[2] = 0; | |
377 | hdr[3] = 0x20 | (key_id << 6); | |
378 | hdr[4] = pn[3]; | |
379 | hdr[5] = pn[2]; | |
380 | hdr[6] = pn[1]; | |
381 | hdr[7] = pn[0]; | |
382 | } | |
383 | ||
384 | ||
c6a1fa12 | 385 | static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) |
f0706e82 JB |
386 | { |
387 | pn[0] = hdr[7]; | |
388 | pn[1] = hdr[6]; | |
389 | pn[2] = hdr[5]; | |
390 | pn[3] = hdr[4]; | |
391 | pn[4] = hdr[1]; | |
392 | pn[5] = hdr[0]; | |
f0706e82 JB |
393 | } |
394 | ||
395 | ||
e039fa4a | 396 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
397 | { |
398 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
399 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 400 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 401 | int hdrlen, len, tail; |
aba83a0b JB |
402 | u8 *pos; |
403 | u8 pn[6]; | |
404 | u64 pn64; | |
7ec7c4a9 AB |
405 | u8 aad[2 * AES_BLOCK_SIZE]; |
406 | u8 b_0[AES_BLOCK_SIZE]; | |
f0706e82 | 407 | |
813d7669 | 408 | if (info->control.hw_key && |
077a9154 | 409 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
17d38fa8 MK |
410 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && |
411 | !((info->control.hw_key->flags & | |
412 | IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && | |
413 | ieee80211_is_mgmt(hdr->frame_control))) { | |
813d7669 JB |
414 | /* |
415 | * hwaccel has no need for preallocated room for CCMP | |
416 | * header or MIC fields | |
417 | */ | |
23c0752a | 418 | return 0; |
e039fa4a JB |
419 | } |
420 | ||
d5184cac | 421 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
422 | len = skb->len - hdrlen; |
423 | ||
813d7669 | 424 | if (info->control.hw_key) |
23c0752a | 425 | tail = 0; |
11a843b7 | 426 | else |
4325f6ca | 427 | tail = IEEE80211_CCMP_MIC_LEN; |
23c0752a JB |
428 | |
429 | if (WARN_ON(skb_tailroom(skb) < tail || | |
4325f6ca | 430 | skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) |
23c0752a | 431 | return -1; |
f0706e82 | 432 | |
4325f6ca JB |
433 | pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); |
434 | memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); | |
077a9154 AN |
435 | |
436 | /* the HW only needs room for the IV, but not the actual IV */ | |
e0830f71 AN |
437 | if (info->control.hw_key && |
438 | (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) | |
077a9154 AN |
439 | return 0; |
440 | ||
f0706e82 JB |
441 | hdr = (struct ieee80211_hdr *) pos; |
442 | pos += hdrlen; | |
443 | ||
aba83a0b | 444 | pn64 = atomic64_inc_return(&key->u.ccmp.tx_pn); |
f0706e82 | 445 | |
aba83a0b JB |
446 | pn[5] = pn64; |
447 | pn[4] = pn64 >> 8; | |
448 | pn[3] = pn64 >> 16; | |
449 | pn[2] = pn64 >> 24; | |
450 | pn[1] = pn64 >> 32; | |
451 | pn[0] = pn64 >> 40; | |
f0706e82 | 452 | |
8f20fc24 | 453 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 454 | |
813d7669 JB |
455 | /* hwaccel - with software CCMP header */ |
456 | if (info->control.hw_key) | |
f0706e82 | 457 | return 0; |
f0706e82 | 458 | |
4325f6ca | 459 | pos += IEEE80211_CCMP_HDR_LEN; |
30ef7ef9 | 460 | ccmp_special_blocks(skb, pn, b_0, aad); |
7ec7c4a9 AB |
461 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, |
462 | skb_put(skb, IEEE80211_CCMP_MIC_LEN)); | |
f0706e82 JB |
463 | |
464 | return 0; | |
465 | } | |
466 | ||
467 | ||
9ae54c84 | 468 | ieee80211_tx_result |
5cf121c3 | 469 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 470 | { |
252b86c4 | 471 | struct sk_buff *skb; |
f0706e82 | 472 | |
5cf121c3 | 473 | ieee80211_tx_set_protected(tx); |
f0706e82 | 474 | |
252b86c4 | 475 | skb_queue_walk(&tx->skbs, skb) { |
2de8e0d9 JB |
476 | if (ccmp_encrypt_skb(tx, skb) < 0) |
477 | return TX_DROP; | |
252b86c4 | 478 | } |
f0706e82 | 479 | |
9ae54c84 | 480 | return TX_CONTINUE; |
f0706e82 JB |
481 | } |
482 | ||
483 | ||
9ae54c84 | 484 | ieee80211_rx_result |
5cf121c3 | 485 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 | 486 | { |
c34498b9 | 487 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
488 | int hdrlen; |
489 | struct ieee80211_key *key = rx->key; | |
490 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 491 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
4325f6ca | 492 | u8 pn[IEEE80211_CCMP_PN_LEN]; |
f0706e82 | 493 | int data_len; |
9190252c | 494 | int queue; |
f0706e82 | 495 | |
d5184cac | 496 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 497 | |
fb733336 | 498 | if (!ieee80211_is_data(hdr->frame_control) && |
d8ca16db | 499 | !ieee80211_is_robust_mgmt_frame(skb)) |
9ae54c84 | 500 | return RX_CONTINUE; |
f0706e82 | 501 | |
4325f6ca JB |
502 | data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - |
503 | IEEE80211_CCMP_MIC_LEN; | |
f0706e82 | 504 | if (!rx->sta || data_len < 0) |
e4c26add | 505 | return RX_DROP_UNUSABLE; |
f0706e82 | 506 | |
a8286911 | 507 | if (status->flag & RX_FLAG_DECRYPTED) { |
4325f6ca | 508 | if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) |
a8286911 JB |
509 | return RX_DROP_UNUSABLE; |
510 | } else { | |
511 | if (skb_linearize(rx->skb)) | |
512 | return RX_DROP_UNUSABLE; | |
513 | } | |
514 | ||
c6a1fa12 | 515 | ccmp_hdr2pn(pn, skb->data + hdrlen); |
f0706e82 | 516 | |
9e26297a | 517 | queue = rx->security_idx; |
9190252c | 518 | |
4325f6ca | 519 | if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) { |
f0706e82 | 520 | key->u.ccmp.replays++; |
e4c26add | 521 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
522 | } |
523 | ||
eb9fb5b8 | 524 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
7ec7c4a9 AB |
525 | u8 aad[2 * AES_BLOCK_SIZE]; |
526 | u8 b_0[AES_BLOCK_SIZE]; | |
7848ba7d | 527 | /* hardware didn't decrypt/verify MIC */ |
30ef7ef9 | 528 | ccmp_special_blocks(skb, pn, b_0, aad); |
f0706e82 JB |
529 | |
530 | if (ieee80211_aes_ccm_decrypt( | |
7ec7c4a9 | 531 | key->u.ccmp.tfm, b_0, aad, |
4325f6ca JB |
532 | skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, |
533 | data_len, | |
7ec7c4a9 | 534 | skb->data + skb->len - IEEE80211_CCMP_MIC_LEN)) |
e4c26add | 535 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
536 | } |
537 | ||
4325f6ca | 538 | memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); |
f0706e82 JB |
539 | |
540 | /* Remove CCMP header and MIC */ | |
4325f6ca | 541 | if (pskb_trim(skb, skb->len - IEEE80211_CCMP_MIC_LEN)) |
a8286911 | 542 | return RX_DROP_UNUSABLE; |
4325f6ca JB |
543 | memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); |
544 | skb_pull(skb, IEEE80211_CCMP_HDR_LEN); | |
f0706e82 | 545 | |
9ae54c84 | 546 | return RX_CONTINUE; |
f0706e82 | 547 | } |
765cb46a | 548 | |
2475b1cc MS |
549 | static ieee80211_tx_result |
550 | ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, | |
551 | struct sk_buff *skb) | |
552 | { | |
553 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
554 | struct ieee80211_key *key = tx->key; | |
555 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
556 | const struct ieee80211_cipher_scheme *cs = key->sta->cipher_scheme; | |
557 | int hdrlen; | |
558 | u8 *pos; | |
559 | ||
560 | if (info->control.hw_key && | |
561 | !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { | |
562 | /* hwaccel has no need for preallocated head room */ | |
563 | return TX_CONTINUE; | |
564 | } | |
565 | ||
566 | if (unlikely(skb_headroom(skb) < cs->hdr_len && | |
567 | pskb_expand_head(skb, cs->hdr_len, 0, GFP_ATOMIC))) | |
568 | return TX_DROP; | |
569 | ||
570 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
571 | ||
572 | pos = skb_push(skb, cs->hdr_len); | |
573 | memmove(pos, pos + cs->hdr_len, hdrlen); | |
2475b1cc MS |
574 | |
575 | return TX_CONTINUE; | |
576 | } | |
577 | ||
578 | static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) | |
579 | { | |
580 | int i; | |
581 | ||
582 | /* pn is little endian */ | |
583 | for (i = len - 1; i >= 0; i--) { | |
584 | if (pn1[i] < pn2[i]) | |
585 | return -1; | |
586 | else if (pn1[i] > pn2[i]) | |
587 | return 1; | |
588 | } | |
589 | ||
590 | return 0; | |
591 | } | |
592 | ||
593 | static ieee80211_rx_result | |
594 | ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) | |
595 | { | |
596 | struct ieee80211_key *key = rx->key; | |
597 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; | |
598 | const struct ieee80211_cipher_scheme *cs = NULL; | |
599 | int hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
600 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); | |
601 | int data_len; | |
602 | u8 *rx_pn; | |
603 | u8 *skb_pn; | |
604 | u8 qos_tid; | |
605 | ||
606 | if (!rx->sta || !rx->sta->cipher_scheme || | |
607 | !(status->flag & RX_FLAG_DECRYPTED)) | |
608 | return RX_DROP_UNUSABLE; | |
609 | ||
610 | if (!ieee80211_is_data(hdr->frame_control)) | |
611 | return RX_CONTINUE; | |
612 | ||
613 | cs = rx->sta->cipher_scheme; | |
614 | ||
615 | data_len = rx->skb->len - hdrlen - cs->hdr_len; | |
616 | ||
617 | if (data_len < 0) | |
618 | return RX_DROP_UNUSABLE; | |
619 | ||
620 | if (ieee80211_is_data_qos(hdr->frame_control)) | |
621 | qos_tid = *ieee80211_get_qos_ctl(hdr) & | |
622 | IEEE80211_QOS_CTL_TID_MASK; | |
623 | else | |
624 | qos_tid = 0; | |
625 | ||
626 | if (skb_linearize(rx->skb)) | |
627 | return RX_DROP_UNUSABLE; | |
628 | ||
629 | hdr = (struct ieee80211_hdr *)rx->skb->data; | |
630 | ||
631 | rx_pn = key->u.gen.rx_pn[qos_tid]; | |
632 | skb_pn = rx->skb->data + hdrlen + cs->pn_off; | |
633 | ||
634 | if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) | |
635 | return RX_DROP_UNUSABLE; | |
636 | ||
637 | memcpy(rx_pn, skb_pn, cs->pn_len); | |
638 | ||
639 | /* remove security header and MIC */ | |
640 | if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) | |
641 | return RX_DROP_UNUSABLE; | |
642 | ||
643 | memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); | |
644 | skb_pull(rx->skb, cs->hdr_len); | |
645 | ||
646 | return RX_CONTINUE; | |
647 | } | |
765cb46a JM |
648 | |
649 | static void bip_aad(struct sk_buff *skb, u8 *aad) | |
650 | { | |
33766368 JM |
651 | __le16 mask_fc; |
652 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
653 | ||
765cb46a JM |
654 | /* BIP AAD: FC(masked) || A1 || A2 || A3 */ |
655 | ||
656 | /* FC type/subtype */ | |
765cb46a | 657 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
33766368 JM |
658 | mask_fc = hdr->frame_control; |
659 | mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | | |
660 | IEEE80211_FCTL_MOREDATA); | |
661 | put_unaligned(mask_fc, (__le16 *) &aad[0]); | |
765cb46a | 662 | /* A1 || A2 || A3 */ |
33766368 | 663 | memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); |
765cb46a JM |
664 | } |
665 | ||
666 | ||
75396ae6 JB |
667 | static inline void bip_ipn_set64(u8 *d, u64 pn) |
668 | { | |
669 | *d++ = pn; | |
670 | *d++ = pn >> 8; | |
671 | *d++ = pn >> 16; | |
672 | *d++ = pn >> 24; | |
673 | *d++ = pn >> 32; | |
674 | *d = pn >> 40; | |
675 | } | |
676 | ||
765cb46a JM |
677 | static inline void bip_ipn_swap(u8 *d, const u8 *s) |
678 | { | |
679 | *d++ = s[5]; | |
680 | *d++ = s[4]; | |
681 | *d++ = s[3]; | |
682 | *d++ = s[2]; | |
683 | *d++ = s[1]; | |
684 | *d = s[0]; | |
685 | } | |
686 | ||
687 | ||
688 | ieee80211_tx_result | |
689 | ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) | |
690 | { | |
252b86c4 JB |
691 | struct sk_buff *skb; |
692 | struct ieee80211_tx_info *info; | |
765cb46a JM |
693 | struct ieee80211_key *key = tx->key; |
694 | struct ieee80211_mmie *mmie; | |
75396ae6 JB |
695 | u8 aad[20]; |
696 | u64 pn64; | |
765cb46a | 697 | |
252b86c4 JB |
698 | if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) |
699 | return TX_DROP; | |
700 | ||
701 | skb = skb_peek(&tx->skbs); | |
702 | ||
703 | info = IEEE80211_SKB_CB(skb); | |
704 | ||
813d7669 | 705 | if (info->control.hw_key) |
252b86c4 | 706 | return TX_CONTINUE; |
765cb46a JM |
707 | |
708 | if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) | |
709 | return TX_DROP; | |
710 | ||
711 | mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); | |
712 | mmie->element_id = WLAN_EID_MMIE; | |
713 | mmie->length = sizeof(*mmie) - 2; | |
714 | mmie->key_id = cpu_to_le16(key->conf.keyidx); | |
715 | ||
716 | /* PN = PN + 1 */ | |
75396ae6 | 717 | pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); |
765cb46a | 718 | |
75396ae6 | 719 | bip_ipn_set64(mmie->sequence_number, pn64); |
765cb46a JM |
720 | |
721 | bip_aad(skb, aad); | |
722 | ||
723 | /* | |
724 | * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) | |
725 | */ | |
75396ae6 JB |
726 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
727 | skb->data + 24, skb->len - 24, mmie->mic); | |
765cb46a JM |
728 | |
729 | return TX_CONTINUE; | |
730 | } | |
731 | ||
732 | ||
733 | ieee80211_rx_result | |
734 | ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) | |
735 | { | |
736 | struct sk_buff *skb = rx->skb; | |
eb9fb5b8 | 737 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
765cb46a JM |
738 | struct ieee80211_key *key = rx->key; |
739 | struct ieee80211_mmie *mmie; | |
740 | u8 aad[20], mic[8], ipn[6]; | |
741 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
742 | ||
743 | if (!ieee80211_is_mgmt(hdr->frame_control)) | |
744 | return RX_CONTINUE; | |
745 | ||
a8286911 JB |
746 | /* management frames are already linear */ |
747 | ||
765cb46a JM |
748 | if (skb->len < 24 + sizeof(*mmie)) |
749 | return RX_DROP_UNUSABLE; | |
750 | ||
751 | mmie = (struct ieee80211_mmie *) | |
752 | (skb->data + skb->len - sizeof(*mmie)); | |
753 | if (mmie->element_id != WLAN_EID_MMIE || | |
754 | mmie->length != sizeof(*mmie) - 2) | |
755 | return RX_DROP_UNUSABLE; /* Invalid MMIE */ | |
756 | ||
757 | bip_ipn_swap(ipn, mmie->sequence_number); | |
758 | ||
759 | if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { | |
760 | key->u.aes_cmac.replays++; | |
761 | return RX_DROP_UNUSABLE; | |
762 | } | |
763 | ||
eb9fb5b8 | 764 | if (!(status->flag & RX_FLAG_DECRYPTED)) { |
765cb46a JM |
765 | /* hardware didn't decrypt/verify MIC */ |
766 | bip_aad(skb, aad); | |
75396ae6 | 767 | ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, |
765cb46a JM |
768 | skb->data + 24, skb->len - 24, mic); |
769 | if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { | |
770 | key->u.aes_cmac.icverrors++; | |
771 | return RX_DROP_UNUSABLE; | |
772 | } | |
773 | } | |
774 | ||
775 | memcpy(key->u.aes_cmac.rx_pn, ipn, 6); | |
776 | ||
777 | /* Remove MMIE */ | |
778 | skb_trim(skb, skb->len - sizeof(*mmie)); | |
779 | ||
780 | return RX_CONTINUE; | |
781 | } | |
d32a1028 YD |
782 | |
783 | ieee80211_tx_result | |
784 | ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) | |
785 | { | |
786 | struct sk_buff *skb; | |
787 | struct ieee80211_tx_info *info = NULL; | |
2475b1cc | 788 | ieee80211_tx_result res; |
d32a1028 YD |
789 | |
790 | skb_queue_walk(&tx->skbs, skb) { | |
791 | info = IEEE80211_SKB_CB(skb); | |
792 | ||
793 | /* handle hw-only algorithm */ | |
794 | if (!info->control.hw_key) | |
795 | return TX_DROP; | |
2475b1cc MS |
796 | |
797 | if (tx->key->sta->cipher_scheme) { | |
798 | res = ieee80211_crypto_cs_encrypt(tx, skb); | |
799 | if (res != TX_CONTINUE) | |
800 | return res; | |
801 | } | |
d32a1028 YD |
802 | } |
803 | ||
804 | ieee80211_tx_set_protected(tx); | |
805 | ||
806 | return TX_CONTINUE; | |
807 | } | |
2475b1cc MS |
808 | |
809 | ieee80211_rx_result | |
810 | ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) | |
811 | { | |
aeb136c5 | 812 | if (rx->sta && rx->sta->cipher_scheme) |
2475b1cc MS |
813 | return ieee80211_crypto_cs_decrypt(rx); |
814 | ||
815 | return RX_DROP_UNUSABLE; | |
816 | } |