Commit | Line | Data |
---|---|---|
f0706e82 JB |
1 | /* |
2 | * Copyright 2002-2004, Instant802 Networks, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/netdevice.h> | |
10 | #include <linux/types.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/skbuff.h> | |
13 | #include <linux/compiler.h> | |
f14df804 HH |
14 | #include <linux/ieee80211.h> |
15 | #include <asm/unaligned.h> | |
f0706e82 | 16 | #include <net/mac80211.h> |
eb063c17 | 17 | |
f0706e82 JB |
18 | #include "ieee80211_i.h" |
19 | #include "michael.h" | |
20 | #include "tkip.h" | |
21 | #include "aes_ccm.h" | |
22 | #include "wpa.h" | |
23 | ||
24 | static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da, | |
25 | u8 *qos_tid, u8 **data, size_t *data_len) | |
26 | { | |
27 | struct ieee80211_hdr *hdr; | |
28 | size_t hdrlen; | |
d5184cac | 29 | __le16 fc; |
f0706e82 | 30 | |
d5184cac HH |
31 | hdr = (struct ieee80211_hdr *)skb->data; |
32 | fc = hdr->frame_control; | |
f0706e82 | 33 | |
d5184cac HH |
34 | hdrlen = ieee80211_hdrlen(fc); |
35 | ||
36 | *sa = ieee80211_get_SA(hdr); | |
37 | *da = ieee80211_get_DA(hdr); | |
f0706e82 JB |
38 | |
39 | *data = skb->data + hdrlen; | |
40 | *data_len = skb->len - hdrlen; | |
41 | ||
d5184cac | 42 | if (ieee80211_is_data_qos(fc)) |
73e1f7c8 | 43 | *qos_tid = (*ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK) | 0x80; |
d5184cac | 44 | else |
f0706e82 JB |
45 | *qos_tid = 0; |
46 | ||
47 | return skb->len < hdrlen ? -1 : 0; | |
48 | } | |
49 | ||
50 | ||
9ae54c84 | 51 | ieee80211_tx_result |
5cf121c3 | 52 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 53 | { |
ffd7891d | 54 | u8 *data, *sa, *da, *key, *mic, qos_tid, key_offset; |
f0706e82 JB |
55 | size_t data_len; |
56 | u16 fc; | |
57 | struct sk_buff *skb = tx->skb; | |
58 | int authenticator; | |
59 | int wpa_test = 0; | |
23c0752a | 60 | int tail; |
f0706e82 JB |
61 | |
62 | fc = tx->fc; | |
63 | ||
8f20fc24 | 64 | if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || |
f0706e82 | 65 | !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 66 | return TX_CONTINUE; |
f0706e82 JB |
67 | |
68 | if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)) | |
9ae54c84 | 69 | return TX_DROP; |
f0706e82 | 70 | |
11a843b7 | 71 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
5cf121c3 | 72 | !(tx->flags & IEEE80211_TX_FRAGMENTED) && |
7848ba7d | 73 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) && |
f0706e82 JB |
74 | !wpa_test) { |
75 | /* hwaccel - with no need for preallocated room for Michael MIC | |
76 | */ | |
9ae54c84 | 77 | return TX_CONTINUE; |
f0706e82 JB |
78 | } |
79 | ||
23c0752a JB |
80 | tail = MICHAEL_MIC_LEN; |
81 | if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
82 | tail += TKIP_ICV_LEN; | |
83 | ||
84 | if (WARN_ON(skb_tailroom(skb) < tail || | |
85 | skb_headroom(skb) < TKIP_IV_LEN)) | |
86 | return TX_DROP; | |
f0706e82 JB |
87 | |
88 | #if 0 | |
89 | authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ | |
90 | #else | |
91 | authenticator = 1; | |
92 | #endif | |
ffd7891d LR |
93 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
94 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
95 | key_offset = authenticator ? | |
96 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY : | |
97 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; | |
98 | key = &tx->key->conf.key[key_offset]; | |
f0706e82 JB |
99 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
100 | michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic); | |
101 | ||
9ae54c84 | 102 | return TX_CONTINUE; |
f0706e82 JB |
103 | } |
104 | ||
105 | ||
9ae54c84 | 106 | ieee80211_rx_result |
5cf121c3 | 107 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 108 | { |
ffd7891d | 109 | u8 *data, *sa, *da, *key = NULL, qos_tid, key_offset; |
f0706e82 JB |
110 | size_t data_len; |
111 | u16 fc; | |
112 | u8 mic[MICHAEL_MIC_LEN]; | |
113 | struct sk_buff *skb = rx->skb; | |
114 | int authenticator = 1, wpa_test = 0; | |
0795af57 | 115 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
116 | |
117 | fc = rx->fc; | |
118 | ||
3017b80b JB |
119 | /* |
120 | * No way to verify the MIC if the hardware stripped it | |
121 | */ | |
5cf121c3 | 122 | if (rx->status->flag & RX_FLAG_MMIC_STRIPPED) |
9ae54c84 | 123 | return RX_CONTINUE; |
f0706e82 | 124 | |
8f20fc24 | 125 | if (!rx->key || rx->key->conf.alg != ALG_TKIP || |
f0706e82 | 126 | !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 127 | return RX_CONTINUE; |
f0706e82 | 128 | |
f0706e82 JB |
129 | if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len) |
130 | || data_len < MICHAEL_MIC_LEN) | |
e4c26add | 131 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
132 | |
133 | data_len -= MICHAEL_MIC_LEN; | |
134 | ||
135 | #if 0 | |
136 | authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ | |
137 | #else | |
138 | authenticator = 1; | |
139 | #endif | |
ffd7891d LR |
140 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
141 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
142 | key_offset = authenticator ? | |
143 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY : | |
144 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; | |
145 | key = &rx->key->conf.key[key_offset]; | |
f0706e82 JB |
146 | michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic); |
147 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { | |
5cf121c3 | 148 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 149 | return RX_DROP_UNUSABLE; |
f0706e82 | 150 | |
8f20fc24 | 151 | mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx, |
eb063c17 | 152 | (void *) skb->data); |
e4c26add | 153 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
154 | } |
155 | ||
f0706e82 JB |
156 | /* remove Michael MIC from payload */ |
157 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
158 | ||
50741ae0 | 159 | /* update IV in key information to be able to detect replays */ |
b0f76b33 HH |
160 | rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32; |
161 | rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16; | |
50741ae0 | 162 | |
9ae54c84 | 163 | return RX_CONTINUE; |
f0706e82 JB |
164 | } |
165 | ||
166 | ||
e039fa4a | 167 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
168 | { |
169 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
170 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 171 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
172 | unsigned int hdrlen; |
173 | int len, tail; | |
f0706e82 JB |
174 | u8 *pos; |
175 | ||
e039fa4a JB |
176 | info->control.icv_len = TKIP_ICV_LEN; |
177 | info->control.iv_len = TKIP_IV_LEN; | |
178 | ||
179 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
180 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
181 | /* hwaccel - with no need for preallocated room for IV/ICV */ | |
182 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 183 | return 0; |
e039fa4a JB |
184 | } |
185 | ||
d5184cac | 186 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
187 | len = skb->len - hdrlen; |
188 | ||
11a843b7 | 189 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 190 | tail = 0; |
11a843b7 | 191 | else |
23c0752a JB |
192 | tail = TKIP_ICV_LEN; |
193 | ||
194 | if (WARN_ON(skb_tailroom(skb) < tail || | |
195 | skb_headroom(skb) < TKIP_IV_LEN)) | |
196 | return -1; | |
f0706e82 JB |
197 | |
198 | pos = skb_push(skb, TKIP_IV_LEN); | |
199 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
200 | pos += hdrlen; | |
201 | ||
202 | /* Increase IV for the frame */ | |
b0f76b33 HH |
203 | key->u.tkip.tx.iv16++; |
204 | if (key->u.tkip.tx.iv16 == 0) | |
205 | key->u.tkip.tx.iv32++; | |
f0706e82 | 206 | |
11a843b7 | 207 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 208 | /* hwaccel - with preallocated room for IV */ |
c801242c | 209 | ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16); |
f0706e82 | 210 | |
e039fa4a | 211 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
212 | return 0; |
213 | } | |
214 | ||
215 | /* Add room for ICV */ | |
216 | skb_put(skb, TKIP_ICV_LEN); | |
217 | ||
218 | hdr = (struct ieee80211_hdr *) skb->data; | |
219 | ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, | |
220 | key, pos, len, hdr->addr2); | |
221 | return 0; | |
222 | } | |
223 | ||
224 | ||
9ae54c84 | 225 | ieee80211_tx_result |
5cf121c3 | 226 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 227 | { |
f0706e82 | 228 | struct sk_buff *skb = tx->skb; |
f0706e82 | 229 | |
5cf121c3 | 230 | ieee80211_tx_set_protected(tx); |
f0706e82 | 231 | |
e039fa4a | 232 | if (tkip_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 233 | return TX_DROP; |
f0706e82 | 234 | |
5cf121c3 | 235 | if (tx->extra_frag) { |
f0706e82 | 236 | int i; |
5cf121c3 | 237 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 238 | if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 239 | return TX_DROP; |
f0706e82 JB |
240 | } |
241 | } | |
242 | ||
9ae54c84 | 243 | return TX_CONTINUE; |
f0706e82 JB |
244 | } |
245 | ||
246 | ||
9ae54c84 | 247 | ieee80211_rx_result |
5cf121c3 | 248 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
249 | { |
250 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
f0706e82 JB |
251 | int hdrlen, res, hwaccel = 0, wpa_test = 0; |
252 | struct ieee80211_key *key = rx->key; | |
253 | struct sk_buff *skb = rx->skb; | |
0795af57 | 254 | DECLARE_MAC_BUF(mac); |
f0706e82 | 255 | |
d5184cac | 256 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 257 | |
4f0d18e2 | 258 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 259 | return RX_CONTINUE; |
f0706e82 JB |
260 | |
261 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 262 | return RX_DROP_UNUSABLE; |
f0706e82 | 263 | |
5cf121c3 JB |
264 | if (rx->status->flag & RX_FLAG_DECRYPTED) { |
265 | if (rx->status->flag & RX_FLAG_IV_STRIPPED) { | |
7848ba7d JB |
266 | /* |
267 | * Hardware took care of all processing, including | |
268 | * replay protection, and stripped the ICV/IV so | |
269 | * we cannot do any checks here. | |
270 | */ | |
9ae54c84 | 271 | return RX_CONTINUE; |
f0706e82 JB |
272 | } |
273 | ||
274 | /* let TKIP code verify IV, but skip decryption */ | |
275 | hwaccel = 1; | |
276 | } | |
277 | ||
278 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
279 | key, skb->data + hdrlen, | |
280 | skb->len - hdrlen, rx->sta->addr, | |
9ae4fda3 | 281 | hdr->addr1, hwaccel, rx->queue, |
5cf121c3 JB |
282 | &rx->tkip_iv32, |
283 | &rx->tkip_iv16); | |
f4ea83dd | 284 | if (res != TKIP_DECRYPT_OK || wpa_test) |
e4c26add | 285 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
286 | |
287 | /* Trim ICV */ | |
288 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
289 | ||
290 | /* Remove IV */ | |
291 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
292 | skb_pull(skb, TKIP_IV_LEN); | |
293 | ||
9ae54c84 | 294 | return RX_CONTINUE; |
f0706e82 JB |
295 | } |
296 | ||
297 | ||
298 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad, | |
299 | int encrypted) | |
300 | { | |
f14df804 HH |
301 | __le16 mask_fc; |
302 | int a4_included; | |
303 | u8 qos_tid; | |
304 | u16 data_len, len_a; | |
305 | unsigned int hdrlen; | |
306 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 307 | |
f14df804 HH |
308 | /* |
309 | * Mask FC: zero subtype b4 b5 b6 | |
310 | * Retry, PwrMgt, MoreData; set Protected | |
311 | */ | |
312 | mask_fc = hdr->frame_control; | |
313 | mask_fc &= ~cpu_to_le16(0x0070 | IEEE80211_FCTL_RETRY | | |
314 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
315 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
316 | ||
317 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
318 | len_a = hdrlen - 2; | |
319 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 320 | |
f14df804 HH |
321 | if (ieee80211_is_data_qos(hdr->frame_control)) |
322 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
323 | else | |
324 | qos_tid = 0; | |
325 | ||
326 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; | |
327 | if (encrypted) | |
328 | data_len -= CCMP_MIC_LEN; | |
329 | ||
330 | /* First block, b_0 */ | |
f0706e82 JB |
331 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
332 | /* Nonce: QoS Priority | A2 | PN */ | |
333 | b_0[1] = qos_tid; | |
73e1f7c8 | 334 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
f0706e82 JB |
335 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
336 | /* l(m) */ | |
f14df804 | 337 | put_unaligned_be16(data_len, &b_0[14]); |
f0706e82 JB |
338 | |
339 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
340 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
341 | put_unaligned_be16(len_a, &aad[0]); |
342 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 343 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
344 | |
345 | /* Mask Seq#, leave Frag# */ | |
346 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
347 | aad[23] = 0; | |
f14df804 | 348 | |
f0706e82 | 349 | if (a4_included) { |
73e1f7c8 | 350 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 351 | aad[30] = qos_tid; |
f0706e82 | 352 | aad[31] = 0; |
f14df804 | 353 | } else { |
73e1f7c8 | 354 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 355 | aad[24] = qos_tid; |
f0706e82 JB |
356 | } |
357 | } | |
358 | ||
359 | ||
360 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
361 | { | |
362 | hdr[0] = pn[5]; | |
363 | hdr[1] = pn[4]; | |
364 | hdr[2] = 0; | |
365 | hdr[3] = 0x20 | (key_id << 6); | |
366 | hdr[4] = pn[3]; | |
367 | hdr[5] = pn[2]; | |
368 | hdr[6] = pn[1]; | |
369 | hdr[7] = pn[0]; | |
370 | } | |
371 | ||
372 | ||
373 | static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr) | |
374 | { | |
375 | pn[0] = hdr[7]; | |
376 | pn[1] = hdr[6]; | |
377 | pn[2] = hdr[5]; | |
378 | pn[3] = hdr[4]; | |
379 | pn[4] = hdr[1]; | |
380 | pn[5] = hdr[0]; | |
381 | return (hdr[3] >> 6) & 0x03; | |
382 | } | |
383 | ||
384 | ||
e039fa4a | 385 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
386 | { |
387 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
388 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 389 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 390 | int hdrlen, len, tail; |
f0706e82 JB |
391 | u8 *pos, *pn, *b_0, *aad, *scratch; |
392 | int i; | |
393 | ||
e039fa4a JB |
394 | info->control.icv_len = CCMP_MIC_LEN; |
395 | info->control.iv_len = CCMP_HDR_LEN; | |
396 | ||
397 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
398 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
399 | /* hwaccel - with no need for preallocated room for CCMP " | |
400 | * header or MIC fields */ | |
401 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 402 | return 0; |
e039fa4a JB |
403 | } |
404 | ||
f0706e82 JB |
405 | scratch = key->u.ccmp.tx_crypto_buf; |
406 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
407 | aad = scratch + 4 * AES_BLOCK_LEN; | |
408 | ||
d5184cac | 409 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
410 | len = skb->len - hdrlen; |
411 | ||
11a843b7 | 412 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 413 | tail = 0; |
11a843b7 | 414 | else |
23c0752a JB |
415 | tail = CCMP_MIC_LEN; |
416 | ||
417 | if (WARN_ON(skb_tailroom(skb) < tail || | |
418 | skb_headroom(skb) < CCMP_HDR_LEN)) | |
419 | return -1; | |
f0706e82 JB |
420 | |
421 | pos = skb_push(skb, CCMP_HDR_LEN); | |
422 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
423 | hdr = (struct ieee80211_hdr *) pos; | |
424 | pos += hdrlen; | |
425 | ||
426 | /* PN = PN + 1 */ | |
427 | pn = key->u.ccmp.tx_pn; | |
428 | ||
429 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
430 | pn[i]++; | |
431 | if (pn[i]) | |
432 | break; | |
433 | } | |
434 | ||
8f20fc24 | 435 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 436 | |
11a843b7 | 437 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 438 | /* hwaccel - with preallocated room for CCMP header */ |
e039fa4a | 439 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
440 | return 0; |
441 | } | |
442 | ||
443 | pos += CCMP_HDR_LEN; | |
444 | ccmp_special_blocks(skb, pn, b_0, aad, 0); | |
445 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len, | |
446 | pos, skb_put(skb, CCMP_MIC_LEN)); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | ||
9ae54c84 | 452 | ieee80211_tx_result |
5cf121c3 | 453 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 454 | { |
f0706e82 | 455 | struct sk_buff *skb = tx->skb; |
f0706e82 | 456 | |
5cf121c3 | 457 | ieee80211_tx_set_protected(tx); |
f0706e82 | 458 | |
e039fa4a | 459 | if (ccmp_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 460 | return TX_DROP; |
f0706e82 | 461 | |
5cf121c3 | 462 | if (tx->extra_frag) { |
f0706e82 | 463 | int i; |
5cf121c3 | 464 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 465 | if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 466 | return TX_DROP; |
f0706e82 JB |
467 | } |
468 | } | |
469 | ||
9ae54c84 | 470 | return TX_CONTINUE; |
f0706e82 JB |
471 | } |
472 | ||
473 | ||
9ae54c84 | 474 | ieee80211_rx_result |
5cf121c3 | 475 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
476 | { |
477 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
f0706e82 JB |
478 | int hdrlen; |
479 | struct ieee80211_key *key = rx->key; | |
480 | struct sk_buff *skb = rx->skb; | |
481 | u8 pn[CCMP_PN_LEN]; | |
482 | int data_len; | |
0795af57 | 483 | DECLARE_MAC_BUF(mac); |
f0706e82 | 484 | |
d5184cac | 485 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 486 | |
4f0d18e2 | 487 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 488 | return RX_CONTINUE; |
f0706e82 JB |
489 | |
490 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
491 | if (!rx->sta || data_len < 0) | |
e4c26add | 492 | return RX_DROP_UNUSABLE; |
f0706e82 | 493 | |
5cf121c3 JB |
494 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
495 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 496 | return RX_CONTINUE; |
f0706e82 JB |
497 | |
498 | (void) ccmp_hdr2pn(pn, skb->data + hdrlen); | |
499 | ||
5cf121c3 | 500 | if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) { |
f0706e82 | 501 | key->u.ccmp.replays++; |
e4c26add | 502 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
503 | } |
504 | ||
5cf121c3 | 505 | if (!(rx->status->flag & RX_FLAG_DECRYPTED)) { |
7848ba7d | 506 | /* hardware didn't decrypt/verify MIC */ |
f0706e82 JB |
507 | u8 *scratch, *b_0, *aad; |
508 | ||
509 | scratch = key->u.ccmp.rx_crypto_buf; | |
510 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
511 | aad = scratch + 4 * AES_BLOCK_LEN; | |
512 | ||
513 | ccmp_special_blocks(skb, pn, b_0, aad, 1); | |
514 | ||
515 | if (ieee80211_aes_ccm_decrypt( | |
516 | key->u.ccmp.tfm, scratch, b_0, aad, | |
517 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, | |
518 | skb->data + skb->len - CCMP_MIC_LEN, | |
519 | skb->data + hdrlen + CCMP_HDR_LEN)) { | |
e4c26add | 520 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
521 | } |
522 | } | |
523 | ||
5cf121c3 | 524 | memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
525 | |
526 | /* Remove CCMP header and MIC */ | |
527 | skb_trim(skb, skb->len - CCMP_MIC_LEN); | |
528 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); | |
529 | skb_pull(skb, CCMP_HDR_LEN); | |
530 | ||
9ae54c84 | 531 | return RX_CONTINUE; |
f0706e82 | 532 | } |