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 | struct sk_buff *skb = tx->skb; |
32 | int authenticator; | |
33 | int wpa_test = 0; | |
23c0752a | 34 | int tail; |
f0706e82 | 35 | |
c34498b9 | 36 | hdr = (struct ieee80211_hdr *)skb->data; |
8f20fc24 | 37 | if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || |
c34498b9 | 38 | !ieee80211_is_data_present(hdr->frame_control)) |
9ae54c84 | 39 | return TX_CONTINUE; |
f0706e82 | 40 | |
8e8862b7 HH |
41 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
42 | if (skb->len < hdrlen) | |
9ae54c84 | 43 | return TX_DROP; |
f0706e82 | 44 | |
8e8862b7 HH |
45 | data = skb->data + hdrlen; |
46 | data_len = skb->len - hdrlen; | |
47 | ||
11a843b7 | 48 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
5cf121c3 | 49 | !(tx->flags & IEEE80211_TX_FRAGMENTED) && |
7848ba7d | 50 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) && |
f0706e82 JB |
51 | !wpa_test) { |
52 | /* hwaccel - with no need for preallocated room for Michael MIC | |
53 | */ | |
9ae54c84 | 54 | return TX_CONTINUE; |
f0706e82 JB |
55 | } |
56 | ||
23c0752a JB |
57 | tail = MICHAEL_MIC_LEN; |
58 | if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)) | |
59 | tail += TKIP_ICV_LEN; | |
60 | ||
61 | if (WARN_ON(skb_tailroom(skb) < tail || | |
62 | skb_headroom(skb) < TKIP_IV_LEN)) | |
63 | return TX_DROP; | |
f0706e82 JB |
64 | |
65 | #if 0 | |
66 | authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ | |
67 | #else | |
68 | authenticator = 1; | |
69 | #endif | |
ffd7891d LR |
70 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
71 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
72 | key_offset = authenticator ? | |
73 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY : | |
74 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY; | |
75 | key = &tx->key->conf.key[key_offset]; | |
f0706e82 | 76 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
8e8862b7 | 77 | michael_mic(key, hdr, data, data_len, mic); |
f0706e82 | 78 | |
9ae54c84 | 79 | return TX_CONTINUE; |
f0706e82 JB |
80 | } |
81 | ||
82 | ||
9ae54c84 | 83 | ieee80211_rx_result |
5cf121c3 | 84 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 | 85 | { |
8e8862b7 | 86 | u8 *data, *key = NULL, key_offset; |
f0706e82 | 87 | size_t data_len; |
8e8862b7 HH |
88 | unsigned int hdrlen; |
89 | struct ieee80211_hdr *hdr; | |
f0706e82 JB |
90 | u8 mic[MICHAEL_MIC_LEN]; |
91 | struct sk_buff *skb = rx->skb; | |
92 | int authenticator = 1, wpa_test = 0; | |
0795af57 | 93 | DECLARE_MAC_BUF(mac); |
f0706e82 | 94 | |
3017b80b JB |
95 | /* |
96 | * No way to verify the MIC if the hardware stripped it | |
97 | */ | |
5cf121c3 | 98 | if (rx->status->flag & RX_FLAG_MMIC_STRIPPED) |
9ae54c84 | 99 | return RX_CONTINUE; |
f0706e82 | 100 | |
c34498b9 | 101 | hdr = (struct ieee80211_hdr *)skb->data; |
8f20fc24 | 102 | if (!rx->key || rx->key->conf.alg != ALG_TKIP || |
c34498b9 HH |
103 | !ieee80211_has_protected(hdr->frame_control) || |
104 | !ieee80211_is_data_present(hdr->frame_control)) | |
9ae54c84 | 105 | return RX_CONTINUE; |
f0706e82 | 106 | |
8e8862b7 HH |
107 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
108 | if (skb->len < hdrlen + MICHAEL_MIC_LEN) | |
e4c26add | 109 | return RX_DROP_UNUSABLE; |
f0706e82 | 110 | |
8e8862b7 HH |
111 | data = skb->data + hdrlen; |
112 | data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; | |
f0706e82 JB |
113 | |
114 | #if 0 | |
115 | authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ | |
116 | #else | |
117 | authenticator = 1; | |
118 | #endif | |
ffd7891d LR |
119 | /* At this point we know we're using ALG_TKIP. To get the MIC key |
120 | * we now will rely on the offset from the ieee80211_key_conf::key */ | |
121 | key_offset = authenticator ? | |
122 | NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY : | |
123 | NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY; | |
124 | key = &rx->key->conf.key[key_offset]; | |
8e8862b7 | 125 | michael_mic(key, hdr, data, data_len, mic); |
f0706e82 | 126 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { |
5cf121c3 | 127 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 128 | return RX_DROP_UNUSABLE; |
f0706e82 | 129 | |
f698d856 | 130 | mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx, |
eb063c17 | 131 | (void *) skb->data); |
e4c26add | 132 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
133 | } |
134 | ||
f0706e82 JB |
135 | /* remove Michael MIC from payload */ |
136 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
137 | ||
50741ae0 | 138 | /* update IV in key information to be able to detect replays */ |
b0f76b33 HH |
139 | rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32; |
140 | rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16; | |
50741ae0 | 141 | |
9ae54c84 | 142 | return RX_CONTINUE; |
f0706e82 JB |
143 | } |
144 | ||
145 | ||
e039fa4a | 146 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
147 | { |
148 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
149 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 150 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
d5184cac HH |
151 | unsigned int hdrlen; |
152 | int len, tail; | |
f0706e82 JB |
153 | u8 *pos; |
154 | ||
e039fa4a JB |
155 | info->control.icv_len = TKIP_ICV_LEN; |
156 | info->control.iv_len = TKIP_IV_LEN; | |
157 | ||
158 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
159 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
160 | /* hwaccel - with no need for preallocated room for IV/ICV */ | |
161 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 162 | return 0; |
e039fa4a JB |
163 | } |
164 | ||
d5184cac | 165 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
166 | len = skb->len - hdrlen; |
167 | ||
11a843b7 | 168 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 169 | tail = 0; |
11a843b7 | 170 | else |
23c0752a JB |
171 | tail = TKIP_ICV_LEN; |
172 | ||
173 | if (WARN_ON(skb_tailroom(skb) < tail || | |
174 | skb_headroom(skb) < TKIP_IV_LEN)) | |
175 | return -1; | |
f0706e82 JB |
176 | |
177 | pos = skb_push(skb, TKIP_IV_LEN); | |
178 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
179 | pos += hdrlen; | |
180 | ||
181 | /* Increase IV for the frame */ | |
b0f76b33 HH |
182 | key->u.tkip.tx.iv16++; |
183 | if (key->u.tkip.tx.iv16 == 0) | |
184 | key->u.tkip.tx.iv32++; | |
f0706e82 | 185 | |
11a843b7 | 186 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 187 | /* hwaccel - with preallocated room for IV */ |
c801242c | 188 | ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16); |
f0706e82 | 189 | |
e039fa4a | 190 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
191 | return 0; |
192 | } | |
193 | ||
194 | /* Add room for ICV */ | |
195 | skb_put(skb, TKIP_ICV_LEN); | |
196 | ||
197 | hdr = (struct ieee80211_hdr *) skb->data; | |
198 | ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, | |
199 | key, pos, len, hdr->addr2); | |
200 | return 0; | |
201 | } | |
202 | ||
203 | ||
9ae54c84 | 204 | ieee80211_tx_result |
5cf121c3 | 205 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 206 | { |
f0706e82 | 207 | struct sk_buff *skb = tx->skb; |
f0706e82 | 208 | |
5cf121c3 | 209 | ieee80211_tx_set_protected(tx); |
f0706e82 | 210 | |
e039fa4a | 211 | if (tkip_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 212 | return TX_DROP; |
f0706e82 | 213 | |
5cf121c3 | 214 | if (tx->extra_frag) { |
f0706e82 | 215 | int i; |
5cf121c3 | 216 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 217 | if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 218 | return TX_DROP; |
f0706e82 JB |
219 | } |
220 | } | |
221 | ||
9ae54c84 | 222 | return TX_CONTINUE; |
f0706e82 JB |
223 | } |
224 | ||
225 | ||
9ae54c84 | 226 | ieee80211_rx_result |
5cf121c3 | 227 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
228 | { |
229 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
f0706e82 JB |
230 | int hdrlen, res, hwaccel = 0, wpa_test = 0; |
231 | struct ieee80211_key *key = rx->key; | |
232 | struct sk_buff *skb = rx->skb; | |
0795af57 | 233 | DECLARE_MAC_BUF(mac); |
f0706e82 | 234 | |
d5184cac | 235 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 236 | |
c34498b9 | 237 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 238 | return RX_CONTINUE; |
f0706e82 JB |
239 | |
240 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 241 | return RX_DROP_UNUSABLE; |
f0706e82 | 242 | |
5cf121c3 JB |
243 | if (rx->status->flag & RX_FLAG_DECRYPTED) { |
244 | if (rx->status->flag & RX_FLAG_IV_STRIPPED) { | |
7848ba7d JB |
245 | /* |
246 | * Hardware took care of all processing, including | |
247 | * replay protection, and stripped the ICV/IV so | |
248 | * we cannot do any checks here. | |
249 | */ | |
9ae54c84 | 250 | return RX_CONTINUE; |
f0706e82 JB |
251 | } |
252 | ||
253 | /* let TKIP code verify IV, but skip decryption */ | |
254 | hwaccel = 1; | |
255 | } | |
256 | ||
257 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
258 | key, skb->data + hdrlen, | |
17741cdc | 259 | skb->len - hdrlen, rx->sta->sta.addr, |
9ae4fda3 | 260 | hdr->addr1, hwaccel, rx->queue, |
5cf121c3 JB |
261 | &rx->tkip_iv32, |
262 | &rx->tkip_iv16); | |
f4ea83dd | 263 | if (res != TKIP_DECRYPT_OK || wpa_test) |
e4c26add | 264 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
265 | |
266 | /* Trim ICV */ | |
267 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
268 | ||
269 | /* Remove IV */ | |
270 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
271 | skb_pull(skb, TKIP_IV_LEN); | |
272 | ||
9ae54c84 | 273 | return RX_CONTINUE; |
f0706e82 JB |
274 | } |
275 | ||
276 | ||
feccb466 | 277 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch, |
f0706e82 JB |
278 | int encrypted) |
279 | { | |
f14df804 HH |
280 | __le16 mask_fc; |
281 | int a4_included; | |
282 | u8 qos_tid; | |
feccb466 | 283 | u8 *b_0, *aad; |
f14df804 HH |
284 | u16 data_len, len_a; |
285 | unsigned int hdrlen; | |
286 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; | |
f0706e82 | 287 | |
feccb466 HH |
288 | b_0 = scratch + 3 * AES_BLOCK_LEN; |
289 | aad = scratch + 4 * AES_BLOCK_LEN; | |
290 | ||
f14df804 HH |
291 | /* |
292 | * Mask FC: zero subtype b4 b5 b6 | |
293 | * Retry, PwrMgt, MoreData; set Protected | |
294 | */ | |
295 | mask_fc = hdr->frame_control; | |
296 | mask_fc &= ~cpu_to_le16(0x0070 | IEEE80211_FCTL_RETRY | | |
297 | IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); | |
298 | mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); | |
299 | ||
300 | hdrlen = ieee80211_hdrlen(hdr->frame_control); | |
301 | len_a = hdrlen - 2; | |
302 | a4_included = ieee80211_has_a4(hdr->frame_control); | |
f0706e82 | 303 | |
f14df804 HH |
304 | if (ieee80211_is_data_qos(hdr->frame_control)) |
305 | qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; | |
306 | else | |
307 | qos_tid = 0; | |
308 | ||
309 | data_len = skb->len - hdrlen - CCMP_HDR_LEN; | |
310 | if (encrypted) | |
311 | data_len -= CCMP_MIC_LEN; | |
312 | ||
313 | /* First block, b_0 */ | |
f0706e82 JB |
314 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ |
315 | /* Nonce: QoS Priority | A2 | PN */ | |
316 | b_0[1] = qos_tid; | |
73e1f7c8 | 317 | memcpy(&b_0[2], hdr->addr2, ETH_ALEN); |
f0706e82 JB |
318 | memcpy(&b_0[8], pn, CCMP_PN_LEN); |
319 | /* l(m) */ | |
f14df804 | 320 | put_unaligned_be16(data_len, &b_0[14]); |
f0706e82 JB |
321 | |
322 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
323 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
f14df804 HH |
324 | put_unaligned_be16(len_a, &aad[0]); |
325 | put_unaligned(mask_fc, (__le16 *)&aad[2]); | |
73e1f7c8 | 326 | memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); |
f0706e82 JB |
327 | |
328 | /* Mask Seq#, leave Frag# */ | |
329 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
330 | aad[23] = 0; | |
f14df804 | 331 | |
f0706e82 | 332 | if (a4_included) { |
73e1f7c8 | 333 | memcpy(&aad[24], hdr->addr4, ETH_ALEN); |
f14df804 | 334 | aad[30] = qos_tid; |
f0706e82 | 335 | aad[31] = 0; |
f14df804 | 336 | } else { |
73e1f7c8 | 337 | memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); |
f14df804 | 338 | aad[24] = qos_tid; |
f0706e82 JB |
339 | } |
340 | } | |
341 | ||
342 | ||
343 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
344 | { | |
345 | hdr[0] = pn[5]; | |
346 | hdr[1] = pn[4]; | |
347 | hdr[2] = 0; | |
348 | hdr[3] = 0x20 | (key_id << 6); | |
349 | hdr[4] = pn[3]; | |
350 | hdr[5] = pn[2]; | |
351 | hdr[6] = pn[1]; | |
352 | hdr[7] = pn[0]; | |
353 | } | |
354 | ||
355 | ||
356 | static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr) | |
357 | { | |
358 | pn[0] = hdr[7]; | |
359 | pn[1] = hdr[6]; | |
360 | pn[2] = hdr[5]; | |
361 | pn[3] = hdr[4]; | |
362 | pn[4] = hdr[1]; | |
363 | pn[5] = hdr[0]; | |
364 | return (hdr[3] >> 6) & 0x03; | |
365 | } | |
366 | ||
367 | ||
e039fa4a | 368 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) |
f0706e82 JB |
369 | { |
370 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
371 | struct ieee80211_key *key = tx->key; | |
e039fa4a | 372 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
23c0752a | 373 | int hdrlen, len, tail; |
feccb466 | 374 | u8 *pos, *pn; |
f0706e82 JB |
375 | int i; |
376 | ||
e039fa4a JB |
377 | info->control.icv_len = CCMP_MIC_LEN; |
378 | info->control.iv_len = CCMP_HDR_LEN; | |
379 | ||
380 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && | |
381 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { | |
382 | /* hwaccel - with no need for preallocated room for CCMP " | |
383 | * header or MIC fields */ | |
384 | info->control.hw_key = &tx->key->conf; | |
23c0752a | 385 | return 0; |
e039fa4a JB |
386 | } |
387 | ||
d5184cac | 388 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 JB |
389 | len = skb->len - hdrlen; |
390 | ||
11a843b7 | 391 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
23c0752a | 392 | tail = 0; |
11a843b7 | 393 | else |
23c0752a JB |
394 | tail = CCMP_MIC_LEN; |
395 | ||
396 | if (WARN_ON(skb_tailroom(skb) < tail || | |
397 | skb_headroom(skb) < CCMP_HDR_LEN)) | |
398 | return -1; | |
f0706e82 JB |
399 | |
400 | pos = skb_push(skb, CCMP_HDR_LEN); | |
401 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
402 | hdr = (struct ieee80211_hdr *) pos; | |
403 | pos += hdrlen; | |
404 | ||
405 | /* PN = PN + 1 */ | |
406 | pn = key->u.ccmp.tx_pn; | |
407 | ||
408 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
409 | pn[i]++; | |
410 | if (pn[i]) | |
411 | break; | |
412 | } | |
413 | ||
8f20fc24 | 414 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 415 | |
11a843b7 | 416 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 417 | /* hwaccel - with preallocated room for CCMP header */ |
e039fa4a | 418 | info->control.hw_key = &tx->key->conf; |
f0706e82 JB |
419 | return 0; |
420 | } | |
421 | ||
422 | pos += CCMP_HDR_LEN; | |
feccb466 HH |
423 | ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0); |
424 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len, | |
f0706e82 JB |
425 | pos, skb_put(skb, CCMP_MIC_LEN)); |
426 | ||
427 | return 0; | |
428 | } | |
429 | ||
430 | ||
9ae54c84 | 431 | ieee80211_tx_result |
5cf121c3 | 432 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 433 | { |
f0706e82 | 434 | struct sk_buff *skb = tx->skb; |
f0706e82 | 435 | |
5cf121c3 | 436 | ieee80211_tx_set_protected(tx); |
f0706e82 | 437 | |
e039fa4a | 438 | if (ccmp_encrypt_skb(tx, skb) < 0) |
9ae54c84 | 439 | return TX_DROP; |
f0706e82 | 440 | |
5cf121c3 | 441 | if (tx->extra_frag) { |
f0706e82 | 442 | int i; |
5cf121c3 | 443 | for (i = 0; i < tx->num_extra_frag; i++) { |
e039fa4a | 444 | if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0) |
9ae54c84 | 445 | return TX_DROP; |
f0706e82 JB |
446 | } |
447 | } | |
448 | ||
9ae54c84 | 449 | return TX_CONTINUE; |
f0706e82 JB |
450 | } |
451 | ||
452 | ||
9ae54c84 | 453 | ieee80211_rx_result |
5cf121c3 | 454 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 | 455 | { |
c34498b9 | 456 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
f0706e82 JB |
457 | int hdrlen; |
458 | struct ieee80211_key *key = rx->key; | |
459 | struct sk_buff *skb = rx->skb; | |
460 | u8 pn[CCMP_PN_LEN]; | |
461 | int data_len; | |
0795af57 | 462 | DECLARE_MAC_BUF(mac); |
f0706e82 | 463 | |
d5184cac | 464 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
f0706e82 | 465 | |
c34498b9 | 466 | if (!ieee80211_is_data(hdr->frame_control)) |
9ae54c84 | 467 | return RX_CONTINUE; |
f0706e82 JB |
468 | |
469 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
470 | if (!rx->sta || data_len < 0) | |
e4c26add | 471 | return RX_DROP_UNUSABLE; |
f0706e82 | 472 | |
5cf121c3 JB |
473 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
474 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 475 | return RX_CONTINUE; |
f0706e82 JB |
476 | |
477 | (void) ccmp_hdr2pn(pn, skb->data + hdrlen); | |
478 | ||
5cf121c3 | 479 | if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) { |
f0706e82 | 480 | key->u.ccmp.replays++; |
e4c26add | 481 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
482 | } |
483 | ||
5cf121c3 | 484 | if (!(rx->status->flag & RX_FLAG_DECRYPTED)) { |
7848ba7d | 485 | /* hardware didn't decrypt/verify MIC */ |
feccb466 | 486 | ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1); |
f0706e82 JB |
487 | |
488 | if (ieee80211_aes_ccm_decrypt( | |
feccb466 | 489 | key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf, |
f0706e82 JB |
490 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, |
491 | skb->data + skb->len - CCMP_MIC_LEN, | |
492 | skb->data + hdrlen + CCMP_HDR_LEN)) { | |
e4c26add | 493 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
494 | } |
495 | } | |
496 | ||
5cf121c3 | 497 | memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
498 | |
499 | /* Remove CCMP header and MIC */ | |
500 | skb_trim(skb, skb->len - CCMP_MIC_LEN); | |
501 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); | |
502 | skb_pull(skb, CCMP_HDR_LEN); | |
503 | ||
9ae54c84 | 504 | return RX_CONTINUE; |
f0706e82 | 505 | } |