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 | ||
9ae54c84 | 24 | ieee80211_tx_result |
5cf121c3 | 25 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 | 26 | { |
8e8862b7 | 27 | u8 *data, *key, *mic, key_offset; |
f0706e82 | 28 | size_t data_len; |
8e8862b7 HH |
29 | unsigned int hdrlen; |
30 | struct ieee80211_hdr *hdr; | |
f0706e82 JB |
31 | u16 fc; |
32 | struct sk_buff *skb = tx->skb; | |
33 | int authenticator; | |
34 | int wpa_test = 0; | |
23c0752a | 35 | int tail; |
f0706e82 JB |
36 | |
37 | fc = tx->fc; | |
38 | ||
8f20fc24 | 39 | if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || |
f0706e82 | 40 | !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 41 | return TX_CONTINUE; |
f0706e82 | 42 | |
8e8862b7 HH |
43 | hdr = (struct ieee80211_hdr *)skb->data; |
44 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
45 | if (skb->len < hdrlen) | |
9ae54c84 | 46 | return TX_DROP; |
f0706e82 | 47 | |
8e8862b7 HH |
48 | data = skb->data + hdrlen; |
49 | data_len = skb->len - hdrlen; | |
50 | ||
11a843b7 | 51 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
5cf121c3 | 52 | !(tx->flags & IEEE80211_TX_FRAGMENTED) && |
7848ba7d | 53 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) && |
f0706e82 JB |
54 | !wpa_test) { |
55 | /* hwaccel - with no need for preallocated room for Michael MIC | |
56 | */ | |
9ae54c84 | 57 | return TX_CONTINUE; |
f0706e82 JB |
58 | } |
59 | ||
23c0752a JB |
60 | tail = MICHAEL_MIC_LEN; |
61 | if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
62 | tail += TKIP_ICV_LEN; | |
63 | ||
64 | if (WARN_ON(skb_tailroom(skb) < tail || | |
65 | skb_headroom(skb) < TKIP_IV_LEN)) | |
66 | return TX_DROP; | |
f0706e82 JB |
67 | |
68 | #if 0 | |
69 | authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ | |
70 | #else | |
71 | authenticator = 1; | |
72 | #endif | |
ffd7891d LR |
73 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
74 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
75 | key_offset = authenticator ? | |
76 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY : | |
77 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; | |
78 | key = &tx->key->conf.key[key_offset]; | |
f0706e82 | 79 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 80 | michael_mic(key, hdr, data, data_len, mic); |
f0706e82 | 81 | |
9ae54c84 | 82 | return TX_CONTINUE; |
f0706e82 JB |
83 | } |
84 | ||
85 | ||
9ae54c84 | 86 | ieee80211_rx_result |
5cf121c3 | 87 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 88 | { |
8e8862b7 | 89 | u8 *data, *key = NULL, key_offset; |
f0706e82 | 90 | size_t data_len; |
8e8862b7 HH |
91 | unsigned int hdrlen; |
92 | struct ieee80211_hdr *hdr; | |
f0706e82 JB |
93 | u16 fc; |
94 | u8 mic[MICHAEL_MIC_LEN]; | |
95 | struct sk_buff *skb = rx->skb; | |
96 | int authenticator = 1, wpa_test = 0; | |
0795af57 | 97 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
98 | |
99 | fc = rx->fc; | |
100 | ||
3017b80b JB |
101 | /* |
102 | * No way to verify the MIC if the hardware stripped it | |
103 | */ | |
5cf121c3 | 104 | if (rx->status->flag & RX_FLAG_MMIC_STRIPPED) |
9ae54c84 | 105 | return RX_CONTINUE; |
f0706e82 | 106 | |
8f20fc24 | 107 | if (!rx->key || rx->key->conf.alg != ALG_TKIP || |
f0706e82 | 108 | !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 109 | return RX_CONTINUE; |
f0706e82 | 110 | |
8e8862b7 HH |
111 | hdr = (struct ieee80211_hdr *)skb->data; |
112 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
113 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 114 | return RX_DROP_UNUSABLE; |
f0706e82 | 115 | |
8e8862b7 HH |
116 | data = skb->data + hdrlen; |
117 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
f0706e82 JB |
118 | |
119 | #if 0 | |
120 | authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ | |
121 | #else | |
122 | authenticator = 1; | |
123 | #endif | |
ffd7891d LR |
124 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
125 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
126 | key_offset = authenticator ? | |
127 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY : | |
128 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; | |
129 | key = &rx->key->conf.key[key_offset]; | |
8e8862b7 | 130 | michael_mic(key, hdr, data, data_len, mic); |
f0706e82 | 131 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { |
5cf121c3 | 132 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 133 | return RX_DROP_UNUSABLE; |
f0706e82 | 134 | |
8f20fc24 | 135 | mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx, |
eb063c17 | 136 | (void *) skb->data); |
e4c26add | 137 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
138 | } |
139 | ||
f0706e82 JB |
140 | /* remove Michael MIC from payload */ |
141 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
142 | ||
50741ae0 | 143 | /* update IV in key information to be able to detect replays */ |
b0f76b33 HH |
144 | rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32; |
145 | rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16; | |
50741ae0 | 146 | |
9ae54c84 | 147 | return RX_CONTINUE; |
f0706e82 JB |
148 | } |
149 | ||
150 | ||
e039fa4a | 151 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
152 | { |
153 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
154 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 155 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
156 | unsigned int hdrlen; |
157 | int len, tail; | |
f0706e82 JB |
158 | u8 *pos; |
159 | ||
e039fa4a JB |
160 | info->control.icv_len = TKIP_ICV_LEN; |
161 | info->control.iv_len = TKIP_IV_LEN; | |
162 | ||
163 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
164 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
165 | /* hwaccel - with no need for preallocated room for IV/ICV */ | |
166 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 167 | return 0; |
e039fa4a JB |
168 | } |
169 | ||
d5184cac | 170 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
171 | len = skb->len - hdrlen; |
172 | ||
11a843b7 | 173 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 174 | tail = 0; |
11a843b7 | 175 | else |
23c0752a JB |
176 | tail = TKIP_ICV_LEN; |
177 | ||
178 | if (WARN_ON(skb_tailroom(skb) < tail || | |
179 | skb_headroom(skb) < TKIP_IV_LEN)) | |
180 | return -1; | |
f0706e82 JB |
181 | |
182 | pos = skb_push(skb, TKIP_IV_LEN); | |
183 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
184 | pos += hdrlen; | |
185 | ||
186 | /* Increase IV for the frame */ | |
b0f76b33 HH |
187 | key->u.tkip.tx.iv16++; |
188 | if (key->u.tkip.tx.iv16 == 0) | |
189 | key->u.tkip.tx.iv32++; | |
f0706e82 | 190 | |
11a843b7 | 191 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 192 | /* hwaccel - with preallocated room for IV */ |
c801242c | 193 | ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16); |
f0706e82 | 194 | |
e039fa4a | 195 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
196 | return 0; |
197 | } | |
198 | ||
199 | /* Add room for ICV */ | |
200 | skb_put(skb, TKIP_ICV_LEN); | |
201 | ||
202 | hdr = (struct ieee80211_hdr *) skb->data; | |
203 | ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, | |
204 | key, pos, len, hdr->addr2); | |
205 | return 0; | |
206 | } | |
207 | ||
208 | ||
9ae54c84 | 209 | ieee80211_tx_result |
5cf121c3 | 210 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 211 | { |
f0706e82 | 212 | struct sk_buff *skb = tx->skb; |
f0706e82 | 213 | |
5cf121c3 | 214 | ieee80211_tx_set_protected(tx); |
f0706e82 | 215 | |
e039fa4a | 216 | if (tkip_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 217 | return TX_DROP; |
f0706e82 | 218 | |
5cf121c3 | 219 | if (tx->extra_frag) { |
f0706e82 | 220 | int i; |
5cf121c3 | 221 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 222 | if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 223 | return TX_DROP; |
f0706e82 JB |
224 | } |
225 | } | |
226 | ||
9ae54c84 | 227 | return TX_CONTINUE; |
f0706e82 JB |
228 | } |
229 | ||
230 | ||
9ae54c84 | 231 | ieee80211_rx_result |
5cf121c3 | 232 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
233 | { |
234 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
f0706e82 JB |
235 | int hdrlen, res, hwaccel = 0, wpa_test = 0; |
236 | struct ieee80211_key *key = rx->key; | |
237 | struct sk_buff *skb = rx->skb; | |
0795af57 | 238 | DECLARE_MAC_BUF(mac); |
f0706e82 | 239 | |
d5184cac | 240 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 241 | |
4f0d18e2 | 242 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 243 | return RX_CONTINUE; |
f0706e82 JB |
244 | |
245 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 246 | return RX_DROP_UNUSABLE; |
f0706e82 | 247 | |
5cf121c3 JB |
248 | if (rx->status->flag & RX_FLAG_DECRYPTED) { |
249 | if (rx->status->flag & RX_FLAG_IV_STRIPPED) { | |
7848ba7d JB |
250 | /* |
251 | * Hardware took care of all processing, including | |
252 | * replay protection, and stripped the ICV/IV so | |
253 | * we cannot do any checks here. | |
254 | */ | |
9ae54c84 | 255 | return RX_CONTINUE; |
f0706e82 JB |
256 | } |
257 | ||
258 | /* let TKIP code verify IV, but skip decryption */ | |
259 | hwaccel = 1; | |
260 | } | |
261 | ||
262 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
263 | key, skb->data + hdrlen, | |
264 | skb->len - hdrlen, rx->sta->addr, | |
9ae4fda3 | 265 | hdr->addr1, hwaccel, rx->queue, |
5cf121c3 JB |
266 | &rx->tkip_iv32, |
267 | &rx->tkip_iv16); | |
f4ea83dd | 268 | if (res != TKIP_DECRYPT_OK || wpa_test) |
e4c26add | 269 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
270 | |
271 | /* Trim ICV */ | |
272 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
273 | ||
274 | /* Remove IV */ | |
275 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
276 | skb_pull(skb, TKIP_IV_LEN); | |
277 | ||
9ae54c84 | 278 | return RX_CONTINUE; |
f0706e82 JB |
279 | } |
280 | ||
281 | ||
282 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad, | |
283 | int encrypted) | |
284 | { | |
f14df804 HH |
285 | __le16 mask_fc; |
286 | int a4_included; | |
287 | u8 qos_tid; | |
288 | u16 data_len, len_a; | |
289 | unsigned int hdrlen; | |
290 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 291 | |
f14df804 HH |
292 | /* |
293 | * Mask FC: zero subtype b4 b5 b6 | |
294 | * Retry, PwrMgt, MoreData; set Protected | |
295 | */ | |
296 | mask_fc = hdr->frame_control; | |
297 | mask_fc &= ~cpu_to_le16(0x0070 | IEEE80211_FCTL_RETRY | | |
298 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
299 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
300 | ||
301 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
302 | len_a = hdrlen - 2; | |
303 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 304 | |
f14df804 HH |
305 | if (ieee80211_is_data_qos(hdr->frame_control)) |
306 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
307 | else | |
308 | qos_tid = 0; | |
309 | ||
310 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; | |
311 | if (encrypted) | |
312 | data_len -= CCMP_MIC_LEN; | |
313 | ||
314 | /* First block, b_0 */ | |
f0706e82 JB |
315 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
316 | /* Nonce: QoS Priority | A2 | PN */ | |
317 | b_0[1] = qos_tid; | |
73e1f7c8 | 318 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
f0706e82 JB |
319 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
320 | /* l(m) */ | |
f14df804 | 321 | put_unaligned_be16(data_len, &b_0[14]); |
f0706e82 JB |
322 | |
323 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
324 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
325 | put_unaligned_be16(len_a, &aad[0]); |
326 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 327 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
328 | |
329 | /* Mask Seq#, leave Frag# */ | |
330 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
331 | aad[23] = 0; | |
f14df804 | 332 | |
f0706e82 | 333 | if (a4_included) { |
73e1f7c8 | 334 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 335 | aad[30] = qos_tid; |
f0706e82 | 336 | aad[31] = 0; |
f14df804 | 337 | } else { |
73e1f7c8 | 338 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 339 | aad[24] = qos_tid; |
f0706e82 JB |
340 | } |
341 | } | |
342 | ||
343 | ||
344 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
345 | { | |
346 | hdr[0] = pn[5]; | |
347 | hdr[1] = pn[4]; | |
348 | hdr[2] = 0; | |
349 | hdr[3] = 0x20 | (key_id << 6); | |
350 | hdr[4] = pn[3]; | |
351 | hdr[5] = pn[2]; | |
352 | hdr[6] = pn[1]; | |
353 | hdr[7] = pn[0]; | |
354 | } | |
355 | ||
356 | ||
357 | static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr) | |
358 | { | |
359 | pn[0] = hdr[7]; | |
360 | pn[1] = hdr[6]; | |
361 | pn[2] = hdr[5]; | |
362 | pn[3] = hdr[4]; | |
363 | pn[4] = hdr[1]; | |
364 | pn[5] = hdr[0]; | |
365 | return (hdr[3] >> 6) & 0x03; | |
366 | } | |
367 | ||
368 | ||
e039fa4a | 369 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
370 | { |
371 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
372 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 373 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 374 | int hdrlen, len, tail; |
f0706e82 JB |
375 | u8 *pos, *pn, *b_0, *aad, *scratch; |
376 | int i; | |
377 | ||
e039fa4a JB |
378 | info->control.icv_len = CCMP_MIC_LEN; |
379 | info->control.iv_len = CCMP_HDR_LEN; | |
380 | ||
381 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
382 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
383 | /* hwaccel - with no need for preallocated room for CCMP " | |
384 | * header or MIC fields */ | |
385 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 386 | return 0; |
e039fa4a JB |
387 | } |
388 | ||
f0706e82 JB |
389 | scratch = key->u.ccmp.tx_crypto_buf; |
390 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
391 | aad = scratch + 4 * AES_BLOCK_LEN; | |
392 | ||
d5184cac | 393 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
394 | len = skb->len - hdrlen; |
395 | ||
11a843b7 | 396 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 397 | tail = 0; |
11a843b7 | 398 | else |
23c0752a JB |
399 | tail = CCMP_MIC_LEN; |
400 | ||
401 | if (WARN_ON(skb_tailroom(skb) < tail || | |
402 | skb_headroom(skb) < CCMP_HDR_LEN)) | |
403 | return -1; | |
f0706e82 JB |
404 | |
405 | pos = skb_push(skb, CCMP_HDR_LEN); | |
406 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
407 | hdr = (struct ieee80211_hdr *) pos; | |
408 | pos += hdrlen; | |
409 | ||
410 | /* PN = PN + 1 */ | |
411 | pn = key->u.ccmp.tx_pn; | |
412 | ||
413 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
414 | pn[i]++; | |
415 | if (pn[i]) | |
416 | break; | |
417 | } | |
418 | ||
8f20fc24 | 419 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 420 | |
11a843b7 | 421 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 422 | /* hwaccel - with preallocated room for CCMP header */ |
e039fa4a | 423 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
424 | return 0; |
425 | } | |
426 | ||
427 | pos += CCMP_HDR_LEN; | |
428 | ccmp_special_blocks(skb, pn, b_0, aad, 0); | |
429 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len, | |
430 | pos, skb_put(skb, CCMP_MIC_LEN)); | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
435 | ||
9ae54c84 | 436 | ieee80211_tx_result |
5cf121c3 | 437 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 438 | { |
f0706e82 | 439 | struct sk_buff *skb = tx->skb; |
f0706e82 | 440 | |
5cf121c3 | 441 | ieee80211_tx_set_protected(tx); |
f0706e82 | 442 | |
e039fa4a | 443 | if (ccmp_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 444 | return TX_DROP; |
f0706e82 | 445 | |
5cf121c3 | 446 | if (tx->extra_frag) { |
f0706e82 | 447 | int i; |
5cf121c3 | 448 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 449 | if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 450 | return TX_DROP; |
f0706e82 JB |
451 | } |
452 | } | |
453 | ||
9ae54c84 | 454 | return TX_CONTINUE; |
f0706e82 JB |
455 | } |
456 | ||
457 | ||
9ae54c84 | 458 | ieee80211_rx_result |
5cf121c3 | 459 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
460 | { |
461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
f0706e82 JB |
462 | int hdrlen; |
463 | struct ieee80211_key *key = rx->key; | |
464 | struct sk_buff *skb = rx->skb; | |
465 | u8 pn[CCMP_PN_LEN]; | |
466 | int data_len; | |
0795af57 | 467 | DECLARE_MAC_BUF(mac); |
f0706e82 | 468 | |
d5184cac | 469 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 470 | |
4f0d18e2 | 471 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 472 | return RX_CONTINUE; |
f0706e82 JB |
473 | |
474 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
475 | if (!rx->sta || data_len < 0) | |
e4c26add | 476 | return RX_DROP_UNUSABLE; |
f0706e82 | 477 | |
5cf121c3 JB |
478 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
479 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 480 | return RX_CONTINUE; |
f0706e82 JB |
481 | |
482 | (void) ccmp_hdr2pn(pn, skb->data + hdrlen); | |
483 | ||
5cf121c3 | 484 | if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) { |
f0706e82 | 485 | key->u.ccmp.replays++; |
e4c26add | 486 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
487 | } |
488 | ||
5cf121c3 | 489 | if (!(rx->status->flag & RX_FLAG_DECRYPTED)) { |
7848ba7d | 490 | /* hardware didn't decrypt/verify MIC */ |
f0706e82 JB |
491 | u8 *scratch, *b_0, *aad; |
492 | ||
493 | scratch = key->u.ccmp.rx_crypto_buf; | |
494 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
495 | aad = scratch + 4 * AES_BLOCK_LEN; | |
496 | ||
497 | ccmp_special_blocks(skb, pn, b_0, aad, 1); | |
498 | ||
499 | if (ieee80211_aes_ccm_decrypt( | |
500 | key->u.ccmp.tfm, scratch, b_0, aad, | |
501 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, | |
502 | skb->data + skb->len - CCMP_MIC_LEN, | |
503 | skb->data + hdrlen + CCMP_HDR_LEN)) { | |
e4c26add | 504 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
505 | } |
506 | } | |
507 | ||
5cf121c3 | 508 | memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
509 | |
510 | /* Remove CCMP header and MIC */ | |
511 | skb_trim(skb, skb->len - CCMP_MIC_LEN); | |
512 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); | |
513 | skb_pull(skb, CCMP_HDR_LEN); | |
514 | ||
9ae54c84 | 515 | return RX_CONTINUE; |
f0706e82 | 516 | } |