Commit | Line | Data |
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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> | |
f0706e82 | 14 | #include <net/mac80211.h> |
eb063c17 | 15 | |
f0706e82 JB |
16 | #include "ieee80211_i.h" |
17 | #include "michael.h" | |
18 | #include "tkip.h" | |
19 | #include "aes_ccm.h" | |
20 | #include "wpa.h" | |
21 | ||
22 | static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da, | |
23 | u8 *qos_tid, u8 **data, size_t *data_len) | |
24 | { | |
25 | struct ieee80211_hdr *hdr; | |
26 | size_t hdrlen; | |
27 | u16 fc; | |
28 | int a4_included; | |
29 | u8 *pos; | |
30 | ||
31 | hdr = (struct ieee80211_hdr *) skb->data; | |
32 | fc = le16_to_cpu(hdr->frame_control); | |
33 | ||
34 | hdrlen = 24; | |
35 | if ((fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) == | |
36 | (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) { | |
37 | hdrlen += ETH_ALEN; | |
38 | *sa = hdr->addr4; | |
39 | *da = hdr->addr3; | |
40 | } else if (fc & IEEE80211_FCTL_FROMDS) { | |
41 | *sa = hdr->addr3; | |
42 | *da = hdr->addr1; | |
43 | } else if (fc & IEEE80211_FCTL_TODS) { | |
44 | *sa = hdr->addr2; | |
45 | *da = hdr->addr3; | |
46 | } else { | |
47 | *sa = hdr->addr2; | |
48 | *da = hdr->addr1; | |
49 | } | |
50 | ||
51 | if (fc & 0x80) | |
52 | hdrlen += 2; | |
53 | ||
54 | *data = skb->data + hdrlen; | |
55 | *data_len = skb->len - hdrlen; | |
56 | ||
57 | a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
58 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS); | |
59 | if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA && | |
60 | fc & IEEE80211_STYPE_QOS_DATA) { | |
61 | pos = (u8 *) &hdr->addr4; | |
62 | if (a4_included) | |
63 | pos += 6; | |
64 | *qos_tid = pos[0] & 0x0f; | |
65 | *qos_tid |= 0x80; /* qos_included flag */ | |
66 | } else | |
67 | *qos_tid = 0; | |
68 | ||
69 | return skb->len < hdrlen ? -1 : 0; | |
70 | } | |
71 | ||
72 | ||
9ae54c84 | 73 | ieee80211_tx_result |
5cf121c3 | 74 | ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) |
f0706e82 JB |
75 | { |
76 | u8 *data, *sa, *da, *key, *mic, qos_tid; | |
77 | size_t data_len; | |
78 | u16 fc; | |
79 | struct sk_buff *skb = tx->skb; | |
80 | int authenticator; | |
81 | int wpa_test = 0; | |
82 | ||
83 | fc = tx->fc; | |
84 | ||
8f20fc24 | 85 | if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 || |
f0706e82 | 86 | !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 87 | return TX_CONTINUE; |
f0706e82 JB |
88 | |
89 | if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)) | |
9ae54c84 | 90 | return TX_DROP; |
f0706e82 | 91 | |
11a843b7 | 92 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
5cf121c3 | 93 | !(tx->flags & IEEE80211_TX_FRAGMENTED) && |
7848ba7d | 94 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) && |
f0706e82 JB |
95 | !wpa_test) { |
96 | /* hwaccel - with no need for preallocated room for Michael MIC | |
97 | */ | |
9ae54c84 | 98 | return TX_CONTINUE; |
f0706e82 JB |
99 | } |
100 | ||
101 | if (skb_tailroom(skb) < MICHAEL_MIC_LEN) { | |
102 | I802_DEBUG_INC(tx->local->tx_expand_skb_head); | |
103 | if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, | |
104 | MICHAEL_MIC_LEN + TKIP_ICV_LEN, | |
105 | GFP_ATOMIC))) { | |
106 | printk(KERN_DEBUG "%s: failed to allocate more memory " | |
107 | "for Michael MIC\n", tx->dev->name); | |
9ae54c84 | 108 | return TX_DROP; |
f0706e82 JB |
109 | } |
110 | } | |
111 | ||
112 | #if 0 | |
113 | authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */ | |
114 | #else | |
115 | authenticator = 1; | |
116 | #endif | |
8f20fc24 JB |
117 | key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY : |
118 | ALG_TKIP_TEMP_AUTH_RX_MIC_KEY]; | |
f0706e82 JB |
119 | mic = skb_put(skb, MICHAEL_MIC_LEN); |
120 | michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic); | |
121 | ||
9ae54c84 | 122 | return TX_CONTINUE; |
f0706e82 JB |
123 | } |
124 | ||
125 | ||
9ae54c84 | 126 | ieee80211_rx_result |
5cf121c3 | 127 | ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) |
f0706e82 JB |
128 | { |
129 | u8 *data, *sa, *da, *key = NULL, qos_tid; | |
130 | size_t data_len; | |
131 | u16 fc; | |
132 | u8 mic[MICHAEL_MIC_LEN]; | |
133 | struct sk_buff *skb = rx->skb; | |
134 | int authenticator = 1, wpa_test = 0; | |
0795af57 | 135 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
136 | |
137 | fc = rx->fc; | |
138 | ||
3017b80b JB |
139 | /* |
140 | * No way to verify the MIC if the hardware stripped it | |
141 | */ | |
5cf121c3 | 142 | if (rx->status->flag & RX_FLAG_MMIC_STRIPPED) |
9ae54c84 | 143 | return RX_CONTINUE; |
f0706e82 | 144 | |
8f20fc24 | 145 | if (!rx->key || rx->key->conf.alg != ALG_TKIP || |
f0706e82 | 146 | !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc)) |
9ae54c84 | 147 | return RX_CONTINUE; |
f0706e82 | 148 | |
f0706e82 JB |
149 | if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len) |
150 | || data_len < MICHAEL_MIC_LEN) | |
e4c26add | 151 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
152 | |
153 | data_len -= MICHAEL_MIC_LEN; | |
154 | ||
155 | #if 0 | |
156 | authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */ | |
157 | #else | |
158 | authenticator = 1; | |
159 | #endif | |
8f20fc24 JB |
160 | key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY : |
161 | ALG_TKIP_TEMP_AUTH_TX_MIC_KEY]; | |
f0706e82 JB |
162 | michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic); |
163 | if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) { | |
5cf121c3 | 164 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
e4c26add | 165 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
166 | |
167 | printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from " | |
0795af57 | 168 | "%s\n", rx->dev->name, print_mac(mac, sa)); |
f0706e82 | 169 | |
8f20fc24 | 170 | mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx, |
eb063c17 | 171 | (void *) skb->data); |
e4c26add | 172 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
173 | } |
174 | ||
f0706e82 JB |
175 | /* remove Michael MIC from payload */ |
176 | skb_trim(skb, skb->len - MICHAEL_MIC_LEN); | |
177 | ||
50741ae0 | 178 | /* update IV in key information to be able to detect replays */ |
5cf121c3 JB |
179 | rx->key->u.tkip.iv32_rx[rx->queue] = rx->tkip_iv32; |
180 | rx->key->u.tkip.iv16_rx[rx->queue] = rx->tkip_iv16; | |
50741ae0 | 181 | |
9ae54c84 | 182 | return RX_CONTINUE; |
f0706e82 JB |
183 | } |
184 | ||
185 | ||
5cf121c3 | 186 | static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, |
f0706e82 JB |
187 | struct sk_buff *skb, int test) |
188 | { | |
189 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
190 | struct ieee80211_key *key = tx->key; | |
191 | int hdrlen, len, tailneed; | |
192 | u16 fc; | |
193 | u8 *pos; | |
194 | ||
195 | fc = le16_to_cpu(hdr->frame_control); | |
196 | hdrlen = ieee80211_get_hdrlen(fc); | |
197 | len = skb->len - hdrlen; | |
198 | ||
11a843b7 | 199 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
8f20fc24 | 200 | tailneed = 0; |
11a843b7 JB |
201 | else |
202 | tailneed = TKIP_ICV_LEN; | |
8f20fc24 | 203 | |
f0706e82 JB |
204 | if ((skb_headroom(skb) < TKIP_IV_LEN || |
205 | skb_tailroom(skb) < tailneed)) { | |
206 | I802_DEBUG_INC(tx->local->tx_expand_skb_head); | |
207 | if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed, | |
208 | GFP_ATOMIC))) | |
209 | return -1; | |
210 | } | |
211 | ||
212 | pos = skb_push(skb, TKIP_IV_LEN); | |
213 | memmove(pos, pos + TKIP_IV_LEN, hdrlen); | |
214 | pos += hdrlen; | |
215 | ||
216 | /* Increase IV for the frame */ | |
217 | key->u.tkip.iv16++; | |
218 | if (key->u.tkip.iv16 == 0) | |
219 | key->u.tkip.iv32++; | |
220 | ||
11a843b7 | 221 | if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 JB |
222 | hdr = (struct ieee80211_hdr *)skb->data; |
223 | ||
224 | /* hwaccel - with preallocated room for IV */ | |
225 | ieee80211_tkip_add_iv(pos, key, | |
226 | (u8) (key->u.tkip.iv16 >> 8), | |
227 | (u8) (((key->u.tkip.iv16 >> 8) | 0x20) & | |
228 | 0x7f), | |
229 | (u8) key->u.tkip.iv16); | |
230 | ||
1c014420 | 231 | tx->control->hw_key = &tx->key->conf; |
f0706e82 JB |
232 | return 0; |
233 | } | |
234 | ||
235 | /* Add room for ICV */ | |
236 | skb_put(skb, TKIP_ICV_LEN); | |
237 | ||
238 | hdr = (struct ieee80211_hdr *) skb->data; | |
239 | ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, | |
240 | key, pos, len, hdr->addr2); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | ||
9ae54c84 | 245 | ieee80211_tx_result |
5cf121c3 | 246 | ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 247 | { |
f0706e82 JB |
248 | struct sk_buff *skb = tx->skb; |
249 | int wpa_test = 0, test = 0; | |
250 | ||
5cf121c3 JB |
251 | tx->control->icv_len = TKIP_ICV_LEN; |
252 | tx->control->iv_len = TKIP_IV_LEN; | |
253 | ieee80211_tx_set_protected(tx); | |
f0706e82 | 254 | |
11a843b7 | 255 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
7848ba7d | 256 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) && |
f0706e82 JB |
257 | !wpa_test) { |
258 | /* hwaccel - with no need for preallocated room for IV/ICV */ | |
1c014420 | 259 | tx->control->hw_key = &tx->key->conf; |
9ae54c84 | 260 | return TX_CONTINUE; |
f0706e82 JB |
261 | } |
262 | ||
263 | if (tkip_encrypt_skb(tx, skb, test) < 0) | |
9ae54c84 | 264 | return TX_DROP; |
f0706e82 | 265 | |
5cf121c3 | 266 | if (tx->extra_frag) { |
f0706e82 | 267 | int i; |
5cf121c3 JB |
268 | for (i = 0; i < tx->num_extra_frag; i++) { |
269 | if (tkip_encrypt_skb(tx, tx->extra_frag[i], test) | |
f0706e82 | 270 | < 0) |
9ae54c84 | 271 | return TX_DROP; |
f0706e82 JB |
272 | } |
273 | } | |
274 | ||
9ae54c84 | 275 | return TX_CONTINUE; |
f0706e82 JB |
276 | } |
277 | ||
278 | ||
9ae54c84 | 279 | ieee80211_rx_result |
5cf121c3 | 280 | ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
281 | { |
282 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
283 | u16 fc; | |
284 | int hdrlen, res, hwaccel = 0, wpa_test = 0; | |
285 | struct ieee80211_key *key = rx->key; | |
286 | struct sk_buff *skb = rx->skb; | |
0795af57 | 287 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
288 | |
289 | fc = le16_to_cpu(hdr->frame_control); | |
290 | hdrlen = ieee80211_get_hdrlen(fc); | |
291 | ||
4f0d18e2 | 292 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 293 | return RX_CONTINUE; |
f0706e82 JB |
294 | |
295 | if (!rx->sta || skb->len - hdrlen < 12) | |
e4c26add | 296 | return RX_DROP_UNUSABLE; |
f0706e82 | 297 | |
5cf121c3 JB |
298 | if (rx->status->flag & RX_FLAG_DECRYPTED) { |
299 | if (rx->status->flag & RX_FLAG_IV_STRIPPED) { | |
7848ba7d JB |
300 | /* |
301 | * Hardware took care of all processing, including | |
302 | * replay protection, and stripped the ICV/IV so | |
303 | * we cannot do any checks here. | |
304 | */ | |
9ae54c84 | 305 | return RX_CONTINUE; |
f0706e82 JB |
306 | } |
307 | ||
308 | /* let TKIP code verify IV, but skip decryption */ | |
309 | hwaccel = 1; | |
310 | } | |
311 | ||
312 | res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, | |
313 | key, skb->data + hdrlen, | |
314 | skb->len - hdrlen, rx->sta->addr, | |
9ae4fda3 | 315 | hdr->addr1, hwaccel, rx->queue, |
5cf121c3 JB |
316 | &rx->tkip_iv32, |
317 | &rx->tkip_iv16); | |
f0706e82 | 318 | if (res != TKIP_DECRYPT_OK || wpa_test) { |
7f3ad894 JL |
319 | #ifdef CONFIG_MAC80211_DEBUG |
320 | if (net_ratelimit()) | |
321 | printk(KERN_DEBUG "%s: TKIP decrypt failed for RX " | |
322 | "frame from %s (res=%d)\n", rx->dev->name, | |
323 | print_mac(mac, rx->sta->addr), res); | |
324 | #endif /* CONFIG_MAC80211_DEBUG */ | |
e4c26add | 325 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
326 | } |
327 | ||
328 | /* Trim ICV */ | |
329 | skb_trim(skb, skb->len - TKIP_ICV_LEN); | |
330 | ||
331 | /* Remove IV */ | |
332 | memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen); | |
333 | skb_pull(skb, TKIP_IV_LEN); | |
334 | ||
9ae54c84 | 335 | return RX_CONTINUE; |
f0706e82 JB |
336 | } |
337 | ||
338 | ||
339 | static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad, | |
340 | int encrypted) | |
341 | { | |
342 | u16 fc; | |
343 | int a4_included, qos_included; | |
344 | u8 qos_tid, *fc_pos, *data, *sa, *da; | |
345 | int len_a; | |
346 | size_t data_len; | |
347 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
348 | ||
349 | fc_pos = (u8 *) &hdr->frame_control; | |
350 | fc = fc_pos[0] ^ (fc_pos[1] << 8); | |
351 | a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) == | |
352 | (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS); | |
353 | ||
354 | ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len); | |
355 | data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0); | |
356 | if (qos_tid & 0x80) { | |
357 | qos_included = 1; | |
358 | qos_tid &= 0x0f; | |
359 | } else | |
360 | qos_included = 0; | |
361 | /* First block, b_0 */ | |
362 | ||
363 | b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */ | |
364 | /* Nonce: QoS Priority | A2 | PN */ | |
365 | b_0[1] = qos_tid; | |
366 | memcpy(&b_0[2], hdr->addr2, 6); | |
367 | memcpy(&b_0[8], pn, CCMP_PN_LEN); | |
368 | /* l(m) */ | |
369 | b_0[14] = (data_len >> 8) & 0xff; | |
370 | b_0[15] = data_len & 0xff; | |
371 | ||
372 | ||
373 | /* AAD (extra authenticate-only data) / masked 802.11 header | |
374 | * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ | |
375 | ||
376 | len_a = a4_included ? 28 : 22; | |
377 | if (qos_included) | |
378 | len_a += 2; | |
379 | ||
380 | aad[0] = 0; /* (len_a >> 8) & 0xff; */ | |
381 | aad[1] = len_a & 0xff; | |
382 | /* Mask FC: zero subtype b4 b5 b6 */ | |
383 | aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6)); | |
384 | /* Retry, PwrMgt, MoreData; set Protected */ | |
385 | aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6); | |
386 | memcpy(&aad[4], &hdr->addr1, 18); | |
387 | ||
388 | /* Mask Seq#, leave Frag# */ | |
389 | aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; | |
390 | aad[23] = 0; | |
391 | if (a4_included) { | |
392 | memcpy(&aad[24], hdr->addr4, 6); | |
393 | aad[30] = 0; | |
394 | aad[31] = 0; | |
395 | } else | |
396 | memset(&aad[24], 0, 8); | |
397 | if (qos_included) { | |
398 | u8 *dpos = &aad[a4_included ? 30 : 24]; | |
399 | ||
400 | /* Mask QoS Control field */ | |
401 | dpos[0] = qos_tid; | |
402 | dpos[1] = 0; | |
403 | } | |
404 | } | |
405 | ||
406 | ||
407 | static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) | |
408 | { | |
409 | hdr[0] = pn[5]; | |
410 | hdr[1] = pn[4]; | |
411 | hdr[2] = 0; | |
412 | hdr[3] = 0x20 | (key_id << 6); | |
413 | hdr[4] = pn[3]; | |
414 | hdr[5] = pn[2]; | |
415 | hdr[6] = pn[1]; | |
416 | hdr[7] = pn[0]; | |
417 | } | |
418 | ||
419 | ||
420 | static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr) | |
421 | { | |
422 | pn[0] = hdr[7]; | |
423 | pn[1] = hdr[6]; | |
424 | pn[2] = hdr[5]; | |
425 | pn[3] = hdr[4]; | |
426 | pn[4] = hdr[1]; | |
427 | pn[5] = hdr[0]; | |
428 | return (hdr[3] >> 6) & 0x03; | |
429 | } | |
430 | ||
431 | ||
5cf121c3 | 432 | static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, |
f0706e82 JB |
433 | struct sk_buff *skb, int test) |
434 | { | |
435 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; | |
436 | struct ieee80211_key *key = tx->key; | |
437 | int hdrlen, len, tailneed; | |
438 | u16 fc; | |
439 | u8 *pos, *pn, *b_0, *aad, *scratch; | |
440 | int i; | |
441 | ||
442 | scratch = key->u.ccmp.tx_crypto_buf; | |
443 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
444 | aad = scratch + 4 * AES_BLOCK_LEN; | |
445 | ||
446 | fc = le16_to_cpu(hdr->frame_control); | |
447 | hdrlen = ieee80211_get_hdrlen(fc); | |
448 | len = skb->len - hdrlen; | |
449 | ||
11a843b7 | 450 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) |
8f20fc24 | 451 | tailneed = 0; |
11a843b7 JB |
452 | else |
453 | tailneed = CCMP_MIC_LEN; | |
f0706e82 JB |
454 | |
455 | if ((skb_headroom(skb) < CCMP_HDR_LEN || | |
456 | skb_tailroom(skb) < tailneed)) { | |
457 | I802_DEBUG_INC(tx->local->tx_expand_skb_head); | |
458 | if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed, | |
459 | GFP_ATOMIC))) | |
460 | return -1; | |
461 | } | |
462 | ||
463 | pos = skb_push(skb, CCMP_HDR_LEN); | |
464 | memmove(pos, pos + CCMP_HDR_LEN, hdrlen); | |
465 | hdr = (struct ieee80211_hdr *) pos; | |
466 | pos += hdrlen; | |
467 | ||
468 | /* PN = PN + 1 */ | |
469 | pn = key->u.ccmp.tx_pn; | |
470 | ||
471 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { | |
472 | pn[i]++; | |
473 | if (pn[i]) | |
474 | break; | |
475 | } | |
476 | ||
8f20fc24 | 477 | ccmp_pn2hdr(pos, pn, key->conf.keyidx); |
f0706e82 | 478 | |
11a843b7 | 479 | if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) { |
f0706e82 | 480 | /* hwaccel - with preallocated room for CCMP header */ |
1c014420 | 481 | tx->control->hw_key = &tx->key->conf; |
f0706e82 JB |
482 | return 0; |
483 | } | |
484 | ||
485 | pos += CCMP_HDR_LEN; | |
486 | ccmp_special_blocks(skb, pn, b_0, aad, 0); | |
487 | ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len, | |
488 | pos, skb_put(skb, CCMP_MIC_LEN)); | |
489 | ||
490 | return 0; | |
491 | } | |
492 | ||
493 | ||
9ae54c84 | 494 | ieee80211_tx_result |
5cf121c3 | 495 | ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx) |
f0706e82 | 496 | { |
f0706e82 JB |
497 | struct sk_buff *skb = tx->skb; |
498 | int test = 0; | |
499 | ||
5cf121c3 JB |
500 | tx->control->icv_len = CCMP_MIC_LEN; |
501 | tx->control->iv_len = CCMP_HDR_LEN; | |
502 | ieee80211_tx_set_protected(tx); | |
f0706e82 | 503 | |
11a843b7 | 504 | if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && |
7848ba7d | 505 | !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) { |
f0706e82 JB |
506 | /* hwaccel - with no need for preallocated room for CCMP " |
507 | * header or MIC fields */ | |
1c014420 | 508 | tx->control->hw_key = &tx->key->conf; |
9ae54c84 | 509 | return TX_CONTINUE; |
f0706e82 JB |
510 | } |
511 | ||
512 | if (ccmp_encrypt_skb(tx, skb, test) < 0) | |
9ae54c84 | 513 | return TX_DROP; |
f0706e82 | 514 | |
5cf121c3 | 515 | if (tx->extra_frag) { |
f0706e82 | 516 | int i; |
5cf121c3 JB |
517 | for (i = 0; i < tx->num_extra_frag; i++) { |
518 | if (ccmp_encrypt_skb(tx, tx->extra_frag[i], test) | |
f0706e82 | 519 | < 0) |
9ae54c84 | 520 | return TX_DROP; |
f0706e82 JB |
521 | } |
522 | } | |
523 | ||
9ae54c84 | 524 | return TX_CONTINUE; |
f0706e82 JB |
525 | } |
526 | ||
527 | ||
9ae54c84 | 528 | ieee80211_rx_result |
5cf121c3 | 529 | ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx) |
f0706e82 JB |
530 | { |
531 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; | |
532 | u16 fc; | |
533 | int hdrlen; | |
534 | struct ieee80211_key *key = rx->key; | |
535 | struct sk_buff *skb = rx->skb; | |
536 | u8 pn[CCMP_PN_LEN]; | |
537 | int data_len; | |
0795af57 | 538 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
539 | |
540 | fc = le16_to_cpu(hdr->frame_control); | |
541 | hdrlen = ieee80211_get_hdrlen(fc); | |
542 | ||
4f0d18e2 | 543 | if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA) |
9ae54c84 | 544 | return RX_CONTINUE; |
f0706e82 JB |
545 | |
546 | data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN; | |
547 | if (!rx->sta || data_len < 0) | |
e4c26add | 548 | return RX_DROP_UNUSABLE; |
f0706e82 | 549 | |
5cf121c3 JB |
550 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
551 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) | |
9ae54c84 | 552 | return RX_CONTINUE; |
f0706e82 JB |
553 | |
554 | (void) ccmp_hdr2pn(pn, skb->data + hdrlen); | |
555 | ||
5cf121c3 | 556 | if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) { |
f0706e82 | 557 | #ifdef CONFIG_MAC80211_DEBUG |
5cf121c3 | 558 | u8 *ppn = key->u.ccmp.rx_pn[rx->queue]; |
0795af57 | 559 | |
f0706e82 | 560 | printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from " |
0795af57 | 561 | "%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN " |
f0706e82 | 562 | "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name, |
0795af57 | 563 | print_mac(mac, rx->sta->addr), |
f0706e82 JB |
564 | pn[0], pn[1], pn[2], pn[3], pn[4], pn[5], |
565 | ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]); | |
566 | #endif /* CONFIG_MAC80211_DEBUG */ | |
567 | key->u.ccmp.replays++; | |
e4c26add | 568 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
569 | } |
570 | ||
5cf121c3 | 571 | if (!(rx->status->flag & RX_FLAG_DECRYPTED)) { |
7848ba7d | 572 | /* hardware didn't decrypt/verify MIC */ |
f0706e82 JB |
573 | u8 *scratch, *b_0, *aad; |
574 | ||
575 | scratch = key->u.ccmp.rx_crypto_buf; | |
576 | b_0 = scratch + 3 * AES_BLOCK_LEN; | |
577 | aad = scratch + 4 * AES_BLOCK_LEN; | |
578 | ||
579 | ccmp_special_blocks(skb, pn, b_0, aad, 1); | |
580 | ||
581 | if (ieee80211_aes_ccm_decrypt( | |
582 | key->u.ccmp.tfm, scratch, b_0, aad, | |
583 | skb->data + hdrlen + CCMP_HDR_LEN, data_len, | |
584 | skb->data + skb->len - CCMP_MIC_LEN, | |
585 | skb->data + hdrlen + CCMP_HDR_LEN)) { | |
7f3ad894 JL |
586 | #ifdef CONFIG_MAC80211_DEBUG |
587 | if (net_ratelimit()) | |
588 | printk(KERN_DEBUG "%s: CCMP decrypt failed " | |
589 | "for RX frame from %s\n", rx->dev->name, | |
590 | print_mac(mac, rx->sta->addr)); | |
591 | #endif /* CONFIG_MAC80211_DEBUG */ | |
e4c26add | 592 | return RX_DROP_UNUSABLE; |
f0706e82 JB |
593 | } |
594 | } | |
595 | ||
5cf121c3 | 596 | memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN); |
f0706e82 JB |
597 | |
598 | /* Remove CCMP header and MIC */ | |
599 | skb_trim(skb, skb->len - CCMP_MIC_LEN); | |
600 | memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen); | |
601 | skb_pull(skb, CCMP_HDR_LEN); | |
602 | ||
9ae54c84 | 603 | return RX_CONTINUE; |
f0706e82 | 604 | } |