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Merge tag 'devicetree-fixes-for-4.7' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / mac80211 / wpa.c
CommitLineData
f0706e82
JB		 1/*
2 * Copyright 2002-2004, Instant802 Networks, Inc.
765cb46a 3 * Copyright 2008, Jouni Malinen <j@w1.fi>
f8079d43 4 * Copyright (C) 2016 Intel Deutschland GmbH
f0706e82
JB		 5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/netdevice.h>
12#include <linux/types.h>
f0706e82
JB		 13#include <linux/skbuff.h>
14#include <linux/compiler.h>
f14df804 15#include <linux/ieee80211.h>
5a0e3ad6 16#include <linux/gfp.h>
f14df804 17#include <asm/unaligned.h>
f0706e82 18#include <net/mac80211.h>
aba83a0b 19#include <crypto/aes.h>
eb063c17 20
f0706e82
JB		 21#include "ieee80211_i.h"
22#include "michael.h"
23#include "tkip.h"
24#include "aes_ccm.h"
765cb46a 25#include "aes_cmac.h"
8ade538b 26#include "aes_gmac.h"
00b9cfa3 27#include "aes_gcm.h"
f0706e82
JB		 28#include "wpa.h"
29
9ae54c84 30ieee80211_tx_result
5cf121c3 31ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82 32{
747d753d 33 u8 *data, *key, *mic;
f0706e82 34 size_t data_len;
8e8862b7
HH		 35 unsigned int hdrlen;
36 struct ieee80211_hdr *hdr;
f0706e82 37 struct sk_buff *skb = tx->skb;
813d7669 38 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a 39 int tail;
f0706e82 40
c34498b9 41 hdr = (struct ieee80211_hdr *)skb->data;
97359d12
JB		 42 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
43 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
9ae54c84 44 return TX_CONTINUE;
f0706e82 45
8e8862b7
HH		 46 hdrlen = ieee80211_hdrlen(hdr->frame_control);
47 if (skb->len < hdrlen)
9ae54c84 48 return TX_DROP;
f0706e82 49
8e8862b7
HH		 50 data = skb->data + hdrlen;
51 data_len = skb->len - hdrlen;
52
681d1190
JM		 53 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
54 /* Need to use software crypto for the test */
55 info->control.hw_key = NULL;
56 }
57
813d7669 58 if (info->control.hw_key &&
a26eb27a
JB		 59 (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
60 tx->local->ops->set_frag_threshold) &&
813d7669
JB		 61 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
62 /* hwaccel - with no need for SW-generated MMIC */
9ae54c84 63 return TX_CONTINUE;
f0706e82
JB		 64 }
65
23c0752a 66 tail = MICHAEL_MIC_LEN;
813d7669 67 if (!info->control.hw_key)
4325f6ca 68 tail += IEEE80211_TKIP_ICV_LEN;
23c0752a 69
b1e9be87
JB		 70 if (WARN(skb_tailroom(skb) < tail ||
71 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
72 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
73 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
74 skb_tailroom(skb), tail))
23c0752a 75 return TX_DROP;
f0706e82 76
747d753d 77 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
f0706e82 78 mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7 79 michael_mic(key, hdr, data, data_len, mic);
681d1190
JM		 80 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
81 mic[0]++;
f0706e82 82
9ae54c84 83 return TX_CONTINUE;
f0706e82
JB		 84}
85
86
9ae54c84 87ieee80211_rx_result
5cf121c3 88ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82 89{
747d753d 90 u8 *data, *key = NULL;
f0706e82 91 size_t data_len;
8e8862b7 92 unsigned int hdrlen;
f0706e82
JB		 93 u8 mic[MICHAEL_MIC_LEN];
94 struct sk_buff *skb = rx->skb;
eb9fb5b8
JB		 95 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
96 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
f0706e82 97
816c04fe
CL		 98 /*
99 * it makes no sense to check for MIC errors on anything other
100 * than data frames.
101 */
102 if (!ieee80211_is_data_present(hdr->frame_control))
9ae54c84 103 return RX_CONTINUE;
f0706e82 104
816c04fe
CL		 105 /*
106 * No way to verify the MIC if the hardware stripped it or
107 * the IV with the key index. In this case we have solely rely
108 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
109 * MIC failure report.
110 */
111 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
112 if (status->flag & RX_FLAG_MMIC_ERROR)
b98ea058 113 goto mic_fail_no_key;
816c04fe 114
4045f72b
SG		 115 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
116 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
816c04fe
CL		 117 goto update_iv;
118
119 return RX_CONTINUE;
120 }
121
122 /*
123 * Some hardware seems to generate Michael MIC failure reports; even
124 * though, the frame was not encrypted with TKIP and therefore has no
125 * MIC. Ignore the flag them to avoid triggering countermeasures.
126 */
97359d12 127 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
816c04fe 128 !(status->flag & RX_FLAG_DECRYPTED))
9ae54c84 129 return RX_CONTINUE;
f0706e82 130
816c04fe
CL		 131 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
132 /*
133 * APs with pairwise keys should never receive Michael MIC
134 * errors for non-zero keyidx because these are reserved for
135 * group keys and only the AP is sending real multicast
87ee475e 136 * frames in the BSS.
816c04fe
CL		 137 */
138 return RX_DROP_UNUSABLE;
139 }
140
141 if (status->flag & RX_FLAG_MMIC_ERROR)
142 goto mic_fail;
143
8e8862b7
HH		 144 hdrlen = ieee80211_hdrlen(hdr->frame_control);
145 if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add 146 return RX_DROP_UNUSABLE;
f0706e82 147
a8286911
JB		 148 if (skb_linearize(rx->skb))
149 return RX_DROP_UNUSABLE;
150 hdr = (void *)skb->data;
151
8e8862b7
HH		 152 data = skb->data + hdrlen;
153 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
747d753d 154 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
8e8862b7 155 michael_mic(key, hdr, data, data_len, mic);
816c04fe
CL		 156 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
157 goto mic_fail;
f0706e82 158
f0706e82
JB		 159 /* remove Michael MIC from payload */
160 skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
161
816c04fe 162update_iv:
50741ae0 163 /* update IV in key information to be able to detect replays */
9e26297a
JB		 164 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
165 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;
50741ae0 166
9ae54c84 167 return RX_CONTINUE;
816c04fe
CL		 168
169mic_fail:
b98ea058
S		 170 rx->key->u.tkip.mic_failures++;
171
172mic_fail_no_key:
a66b98db
AN		 173 /*
174 * In some cases the key can be unset - e.g. a multicast packet, in
175 * a driver that supports HW encryption. Send up the key idx only if
176 * the key is set.
177 */
6f1f5d5f
JB		 178 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
179 is_multicast_ether_addr(hdr->addr1) ?
180 NL80211_KEYTYPE_GROUP :
181 NL80211_KEYTYPE_PAIRWISE,
182 rx->key ? rx->key->conf.keyidx : -1,
183 NULL, GFP_ATOMIC);
816c04fe 184 return RX_DROP_UNUSABLE;
f0706e82
JB		 185}
186
e039fa4a 187static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
f0706e82
JB		 188{
189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
190 struct ieee80211_key *key = tx->key;
e039fa4a 191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac
HH		 192 unsigned int hdrlen;
193 int len, tail;
f8079d43 194 u64 pn;
f0706e82
JB		 195 u8 *pos;
196
813d7669 197 if (info->control.hw_key &&
ee70108f
JD		 198 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
199 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
813d7669 200 /* hwaccel - with no need for software-generated IV */
23c0752a 201 return 0;
e039fa4a
JB		 202 }
203
d5184cac 204 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82
JB		 205 len = skb->len - hdrlen;
206
813d7669 207 if (info->control.hw_key)
23c0752a 208 tail = 0;
11a843b7 209 else
4325f6ca 210 tail = IEEE80211_TKIP_ICV_LEN;
23c0752a
JB		 211
212 if (WARN_ON(skb_tailroom(skb) < tail ||
4325f6ca 213 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
23c0752a 214 return -1;
f0706e82 215
4325f6ca
JB		 216 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
217 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
f0706e82
JB		 218 pos += hdrlen;
219
ee70108f
JD		 220 /* the HW only needs room for the IV, but not the actual IV */
221 if (info->control.hw_key &&
222 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
223 return 0;
224
f0706e82 225 /* Increase IV for the frame */
f8079d43
EP		 226 pn = atomic64_inc_return(&key->conf.tx_pn);
227 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);
f0706e82 228
813d7669
JB		 229 /* hwaccel - with software IV */
230 if (info->control.hw_key)
f0706e82 231 return 0;
f0706e82
JB		 232
233 /* Add room for ICV */
4325f6ca 234 skb_put(skb, IEEE80211_TKIP_ICV_LEN);
f0706e82 235
3473187d 236 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
523b02ea 237 key, skb, pos, len);
f0706e82
JB		 238}
239
240
9ae54c84 241ieee80211_tx_result
5cf121c3 242ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82 243{
252b86c4 244 struct sk_buff *skb;
f0706e82 245
5cf121c3 246 ieee80211_tx_set_protected(tx);
f0706e82 247
252b86c4 248 skb_queue_walk(&tx->skbs, skb) {
2de8e0d9
JB		 249 if (tkip_encrypt_skb(tx, skb) < 0)
250 return TX_DROP;
252b86c4 251 }
f0706e82 252
9ae54c84 253 return TX_CONTINUE;
f0706e82
JB		 254}
255
256
9ae54c84 257ieee80211_rx_result
5cf121c3 258ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82
JB		 259{
260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
747d753d 261 int hdrlen, res, hwaccel = 0;
f0706e82
JB		 262 struct ieee80211_key *key = rx->key;
263 struct sk_buff *skb = rx->skb;
eb9fb5b8 264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
f0706e82 265
d5184cac 266 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 267
c34498b9 268 if (!ieee80211_is_data(hdr->frame_control))
9ae54c84 269 return RX_CONTINUE;
f0706e82
JB		 270
271 if (!rx->sta || skb->len - hdrlen < 12)
e4c26add 272 return RX_DROP_UNUSABLE;
f0706e82 273
a8286911
JB		 274 /* it may be possible to optimize this a bit more */
275 if (skb_linearize(rx->skb))
276 return RX_DROP_UNUSABLE;
277 hdr = (void *)skb->data;
278
dc1580dd
JB		 279 /*
280 * Let TKIP code verify IV, but skip decryption.
281 * In the case where hardware checks the IV as well,
282 * we don't even get here, see ieee80211_rx_h_decrypt()
283 */
284 if (status->flag & RX_FLAG_DECRYPTED)
f0706e82 285 hwaccel = 1;
f0706e82
JB		 286
287 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
288 key, skb->data + hdrlen,
17741cdc 289 skb->len - hdrlen, rx->sta->sta.addr,
9e26297a 290 hdr->addr1, hwaccel, rx->security_idx,
5cf121c3
JB		 291 &rx->tkip_iv32,
292 &rx->tkip_iv16);
747d753d 293 if (res != TKIP_DECRYPT_OK)
e4c26add 294 return RX_DROP_UNUSABLE;
f0706e82
JB		 295
296 /* Trim ICV */
4325f6ca 297 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);
f0706e82
JB		 298
299 /* Remove IV */
4325f6ca
JB		 300 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
301 skb_pull(skb, IEEE80211_TKIP_IV_LEN);
f0706e82 302
9ae54c84 303 return RX_CONTINUE;
f0706e82
JB		 304}
305
306
30ef7ef9 307static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
f0706e82 308{
f14df804 309 __le16 mask_fc;
fb733336 310 int a4_included, mgmt;
f14df804 311 u8 qos_tid;
7ec7c4a9 312 u16 len_a;
f14df804
HH		 313 unsigned int hdrlen;
314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
f0706e82 315
f14df804 316 /*
fb733336 317 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
f14df804
HH		 318 * Retry, PwrMgt, MoreData; set Protected
319 */
fb733336 320 mgmt = ieee80211_is_mgmt(hdr->frame_control);
f14df804 321 mask_fc = hdr->frame_control;
fb733336 322 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
f14df804 323 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
fb733336
JM		 324 if (!mgmt)
325 mask_fc &= ~cpu_to_le16(0x0070);
f14df804
HH		 326 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
327
328 hdrlen = ieee80211_hdrlen(hdr->frame_control);
329 len_a = hdrlen - 2;
330 a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82 331
f14df804
HH		 332 if (ieee80211_is_data_qos(hdr->frame_control))
333 qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
334 else
335 qos_tid = 0;
336
7ec7c4a9
AB		 337 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
338 * mode authentication are not allowed to collide, yet both are derived
339 * from this vector b_0. We only set L := 1 here to indicate that the
340 * data size can be represented in (L+1) bytes. The CCM layer will take
341 * care of storing the data length in the top (L+1) bytes and setting
342 * and clearing the other bits as is required to derive the two IVs.
343 */
344 b_0[0] = 0x1;
f14df804 345
fb733336
JM		 346 /* Nonce: Nonce Flags | A2 | PN
347 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
348 */
349 b_0[1] = qos_tid | (mgmt << 4);
73e1f7c8 350 memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
4325f6ca 351 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
f0706e82
JB		 352
353 /* AAD (extra authenticate-only data) / masked 802.11 header
354 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
f14df804
HH		 355 put_unaligned_be16(len_a, &aad[0]);
356 put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8 357 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82
JB		 358
359 /* Mask Seq#, leave Frag# */
360 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
361 aad[23] = 0;
f14df804 362
f0706e82 363 if (a4_included) {
73e1f7c8 364 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804 365 aad[30] = qos_tid;
f0706e82 366 aad[31] = 0;
f14df804 367 } else {
73e1f7c8 368 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804 369 aad[24] = qos_tid;
f0706e82
JB		 370 }
371}
372
373
374static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
375{
376 hdr[0] = pn[5];
377 hdr[1] = pn[4];
378 hdr[2] = 0;
379 hdr[3] = 0x20 | (key_id << 6);
380 hdr[4] = pn[3];
381 hdr[5] = pn[2];
382 hdr[6] = pn[1];
383 hdr[7] = pn[0];
384}
385
386
c6a1fa12 387static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
f0706e82
JB		 388{
389 pn[0] = hdr[7];
390 pn[1] = hdr[6];
391 pn[2] = hdr[5];
392 pn[3] = hdr[4];
393 pn[4] = hdr[1];
394 pn[5] = hdr[0];
f0706e82
JB		 395}
396
397
2b2ba0db
JM		 398static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
399 unsigned int mic_len)
f0706e82
JB		 400{
401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
402 struct ieee80211_key *key = tx->key;
e039fa4a 403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a 404 int hdrlen, len, tail;
aba83a0b
JB		 405 u8 *pos;
406 u8 pn[6];
407 u64 pn64;
7ec7c4a9
AB		 408 u8 aad[2 * AES_BLOCK_SIZE];
409 u8 b_0[AES_BLOCK_SIZE];
f0706e82 410
813d7669 411 if (info->control.hw_key &&
077a9154 412 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
17d38fa8
MK		 413 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
414 !((info->control.hw_key->flags &
415 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
416 ieee80211_is_mgmt(hdr->frame_control))) {
813d7669
JB		 417 /*
418 * hwaccel has no need for preallocated room for CCMP
419 * header or MIC fields
420 */
23c0752a 421 return 0;
e039fa4a
JB		 422 }
423
d5184cac 424 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82
JB		 425 len = skb->len - hdrlen;
426
813d7669 427 if (info->control.hw_key)
23c0752a 428 tail = 0;
11a843b7 429 else
2b2ba0db 430 tail = mic_len;
23c0752a
JB		 431
432 if (WARN_ON(skb_tailroom(skb) < tail ||
4325f6ca 433 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
23c0752a 434 return -1;
f0706e82 435
4325f6ca
JB		 436 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
437 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
077a9154
AN		 438
439 /* the HW only needs room for the IV, but not the actual IV */
e0830f71
AN		 440 if (info->control.hw_key &&
441 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
077a9154
AN		 442 return 0;
443
f0706e82
JB		 444 hdr = (struct ieee80211_hdr *) pos;
445 pos += hdrlen;
446
db388a56 447 pn64 = atomic64_inc_return(&key->conf.tx_pn);
f0706e82 448
aba83a0b
JB		 449 pn[5] = pn64;
450 pn[4] = pn64 >> 8;
451 pn[3] = pn64 >> 16;
452 pn[2] = pn64 >> 24;
453 pn[1] = pn64 >> 32;
454 pn[0] = pn64 >> 40;
f0706e82 455
8f20fc24 456 ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82 457
813d7669
JB		 458 /* hwaccel - with software CCMP header */
459 if (info->control.hw_key)
f0706e82 460 return 0;
f0706e82 461
4325f6ca 462 pos += IEEE80211_CCMP_HDR_LEN;
30ef7ef9 463 ccmp_special_blocks(skb, pn, b_0, aad);
7ec7c4a9 464 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
2b2ba0db 465 skb_put(skb, mic_len), mic_len);
f0706e82
JB		 466
467 return 0;
468}
469
470
9ae54c84 471ieee80211_tx_result
2b2ba0db
JM		 472ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
473 unsigned int mic_len)
f0706e82 474{
252b86c4 475 struct sk_buff *skb;
f0706e82 476
5cf121c3 477 ieee80211_tx_set_protected(tx);
f0706e82 478
252b86c4 479 skb_queue_walk(&tx->skbs, skb) {
2b2ba0db 480 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
2de8e0d9 481 return TX_DROP;
252b86c4 482 }
f0706e82 483
9ae54c84 484 return TX_CONTINUE;
f0706e82
JB		 485}
486
487
9ae54c84 488ieee80211_rx_result
2b2ba0db
JM		 489ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
490 unsigned int mic_len)
f0706e82 491{
c34498b9 492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
f0706e82
JB		 493 int hdrlen;
494 struct ieee80211_key *key = rx->key;
495 struct sk_buff *skb = rx->skb;
eb9fb5b8 496 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
4325f6ca 497 u8 pn[IEEE80211_CCMP_PN_LEN];
f0706e82 498 int data_len;
9190252c 499 int queue;
f0706e82 500
d5184cac 501 hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 502
fb733336 503 if (!ieee80211_is_data(hdr->frame_control) &&
d8ca16db 504 !ieee80211_is_robust_mgmt_frame(skb))
9ae54c84 505 return RX_CONTINUE;
f0706e82 506
a8286911 507 if (status->flag & RX_FLAG_DECRYPTED) {
4325f6ca 508 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
a8286911 509 return RX_DROP_UNUSABLE;
f980ebc0
SS		 510 if (status->flag & RX_FLAG_MIC_STRIPPED)
511 mic_len = 0;
a8286911
JB		 512 } else {
513 if (skb_linearize(rx->skb))
514 return RX_DROP_UNUSABLE;
515 }
516
f980ebc0
SS		 517 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
518 if (!rx->sta || data_len < 0)
519 return RX_DROP_UNUSABLE;
520
981d94a8 521 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
f631a77b
SS		 522 int res;
523
981d94a8 524 ccmp_hdr2pn(pn, skb->data + hdrlen);
f0706e82 525
981d94a8 526 queue = rx->security_idx;
9190252c 527
f631a77b
SS		 528 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
529 IEEE80211_CCMP_PN_LEN);
530 if (res < 0 ||
531 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
981d94a8 532 key->u.ccmp.replays++;
e4c26add 533 return RX_DROP_UNUSABLE;
981d94a8
JB		 534 }
535
536 if (!(status->flag & RX_FLAG_DECRYPTED)) {
537 u8 aad[2 * AES_BLOCK_SIZE];
538 u8 b_0[AES_BLOCK_SIZE];
539 /* hardware didn't decrypt/verify MIC */
540 ccmp_special_blocks(skb, pn, b_0, aad);
541
542 if (ieee80211_aes_ccm_decrypt(
543 key->u.ccmp.tfm, b_0, aad,
544 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
545 data_len,
546 skb->data + skb->len - mic_len, mic_len))
547 return RX_DROP_UNUSABLE;
548 }
549
550 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
f0706e82
JB		 551 }
552
f0706e82 553 /* Remove CCMP header and MIC */
2b2ba0db 554 if (pskb_trim(skb, skb->len - mic_len))
a8286911 555 return RX_DROP_UNUSABLE;
4325f6ca
JB		 556 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
557 skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
f0706e82 558
9ae54c84 559 return RX_CONTINUE;
f0706e82 560}
765cb46a 561
00b9cfa3
JM		 562static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
563{
564 __le16 mask_fc;
565 u8 qos_tid;
566 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
567
568 memcpy(j_0, hdr->addr2, ETH_ALEN);
569 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
570 j_0[13] = 0;
571 j_0[14] = 0;
572 j_0[AES_BLOCK_SIZE - 1] = 0x01;
573
574 /* AAD (extra authenticate-only data) / masked 802.11 header
575 * FC | A1 | A2 | A3 | SC | [A4] | [QC]
576 */
577 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
578 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
579 * Retry, PwrMgt, MoreData; set Protected
580 */
581 mask_fc = hdr->frame_control;
582 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
583 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
584 if (!ieee80211_is_mgmt(hdr->frame_control))
585 mask_fc &= ~cpu_to_le16(0x0070);
586 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
587
588 put_unaligned(mask_fc, (__le16 *)&aad[2]);
589 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
590
591 /* Mask Seq#, leave Frag# */
592 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
593 aad[23] = 0;
594
595 if (ieee80211_is_data_qos(hdr->frame_control))
596 qos_tid = *ieee80211_get_qos_ctl(hdr) &
597 IEEE80211_QOS_CTL_TID_MASK;
598 else
599 qos_tid = 0;
600
601 if (ieee80211_has_a4(hdr->frame_control)) {
602 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
603 aad[30] = qos_tid;
604 aad[31] = 0;
605 } else {
606 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
607 aad[24] = qos_tid;
608 }
609}
610
611static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
612{
613 hdr[0] = pn[5];
614 hdr[1] = pn[4];
615 hdr[2] = 0;
616 hdr[3] = 0x20 | (key_id << 6);
617 hdr[4] = pn[3];
618 hdr[5] = pn[2];
619 hdr[6] = pn[1];
620 hdr[7] = pn[0];
621}
622
623static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
624{
625 pn[0] = hdr[7];
626 pn[1] = hdr[6];
627 pn[2] = hdr[5];
628 pn[3] = hdr[4];
629 pn[4] = hdr[1];
630 pn[5] = hdr[0];
631}
632
633static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
634{
635 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
636 struct ieee80211_key *key = tx->key;
637 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
638 int hdrlen, len, tail;
639 u8 *pos;
640 u8 pn[6];
641 u64 pn64;
642 u8 aad[2 * AES_BLOCK_SIZE];
643 u8 j_0[AES_BLOCK_SIZE];
644
645 if (info->control.hw_key &&
646 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
647 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
648 !((info->control.hw_key->flags &
649 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
650 ieee80211_is_mgmt(hdr->frame_control))) {
651 /* hwaccel has no need for preallocated room for GCMP
652 * header or MIC fields
653 */
654 return 0;
655 }
656
657 hdrlen = ieee80211_hdrlen(hdr->frame_control);
658 len = skb->len - hdrlen;
659
660 if (info->control.hw_key)
661 tail = 0;
662 else
663 tail = IEEE80211_GCMP_MIC_LEN;
664
665 if (WARN_ON(skb_tailroom(skb) < tail ||
666 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
667 return -1;
668
669 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
670 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
671 skb_set_network_header(skb, skb_network_offset(skb) +
672 IEEE80211_GCMP_HDR_LEN);
673
674 /* the HW only needs room for the IV, but not the actual IV */
675 if (info->control.hw_key &&
676 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
677 return 0;
678
679 hdr = (struct ieee80211_hdr *)pos;
680 pos += hdrlen;
681
db388a56 682 pn64 = atomic64_inc_return(&key->conf.tx_pn);
00b9cfa3
JM		 683
684 pn[5] = pn64;
685 pn[4] = pn64 >> 8;
686 pn[3] = pn64 >> 16;
687 pn[2] = pn64 >> 24;
688 pn[1] = pn64 >> 32;
689 pn[0] = pn64 >> 40;
690
691 gcmp_pn2hdr(pos, pn, key->conf.keyidx);
692
693 /* hwaccel - with software GCMP header */
694 if (info->control.hw_key)
695 return 0;
696
697 pos += IEEE80211_GCMP_HDR_LEN;
698 gcmp_special_blocks(skb, pn, j_0, aad);
699 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
700 skb_put(skb, IEEE80211_GCMP_MIC_LEN));
701
702 return 0;
703}
704
705ieee80211_tx_result
706ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
707{
708 struct sk_buff *skb;
709
710 ieee80211_tx_set_protected(tx);
711
712 skb_queue_walk(&tx->skbs, skb) {
713 if (gcmp_encrypt_skb(tx, skb) < 0)
714 return TX_DROP;
715 }
716
717 return TX_CONTINUE;
718}
719
720ieee80211_rx_result
721ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
722{
723 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
724 int hdrlen;
725 struct ieee80211_key *key = rx->key;
726 struct sk_buff *skb = rx->skb;
727 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
728 u8 pn[IEEE80211_GCMP_PN_LEN];
f980ebc0 729 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
00b9cfa3
JM		 730
731 hdrlen = ieee80211_hdrlen(hdr->frame_control);
732
733 if (!ieee80211_is_data(hdr->frame_control) &&
734 !ieee80211_is_robust_mgmt_frame(skb))
735 return RX_CONTINUE;
736
00b9cfa3
JM		 737 if (status->flag & RX_FLAG_DECRYPTED) {
738 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
739 return RX_DROP_UNUSABLE;
f980ebc0
SS		 740 if (status->flag & RX_FLAG_MIC_STRIPPED)
741 mic_len = 0;
00b9cfa3
JM		 742 } else {
743 if (skb_linearize(rx->skb))
744 return RX_DROP_UNUSABLE;
745 }
746
f980ebc0
SS		 747 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
748 if (!rx->sta || data_len < 0)
749 return RX_DROP_UNUSABLE;
750
981d94a8 751 if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
f631a77b
SS		 752 int res;
753
981d94a8 754 gcmp_hdr2pn(pn, skb->data + hdrlen);
00b9cfa3 755
981d94a8 756 queue = rx->security_idx;
00b9cfa3 757
f631a77b
SS		 758 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
759 IEEE80211_GCMP_PN_LEN);
760 if (res < 0 ||
761 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
981d94a8 762 key->u.gcmp.replays++;
00b9cfa3 763 return RX_DROP_UNUSABLE;
981d94a8
JB		 764 }
765
766 if (!(status->flag & RX_FLAG_DECRYPTED)) {
767 u8 aad[2 * AES_BLOCK_SIZE];
768 u8 j_0[AES_BLOCK_SIZE];
769 /* hardware didn't decrypt/verify MIC */
770 gcmp_special_blocks(skb, pn, j_0, aad);
771
772 if (ieee80211_aes_gcm_decrypt(
773 key->u.gcmp.tfm, j_0, aad,
774 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
775 data_len,
776 skb->data + skb->len -
777 IEEE80211_GCMP_MIC_LEN))
778 return RX_DROP_UNUSABLE;
779 }
780
781 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
00b9cfa3
JM		 782 }
783
00b9cfa3 784 /* Remove GCMP header and MIC */
f980ebc0 785 if (pskb_trim(skb, skb->len - mic_len))
00b9cfa3
JM		 786 return RX_DROP_UNUSABLE;
787 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
788 skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
789
790 return RX_CONTINUE;
791}
792
2475b1cc
MS		 793static ieee80211_tx_result
794ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx,
795 struct sk_buff *skb)
796{
797 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
798 struct ieee80211_key *key = tx->key;
799 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2475b1cc 800 int hdrlen;
c7ef38e0 801 u8 *pos, iv_len = key->conf.iv_len;
2475b1cc
MS		 802
803 if (info->control.hw_key &&
804 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
805 /* hwaccel has no need for preallocated head room */
806 return TX_CONTINUE;
807 }
808
c7ef38e0
CI		 809 if (unlikely(skb_headroom(skb) < iv_len &&
810 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC)))
2475b1cc
MS		 811 return TX_DROP;
812
813 hdrlen = ieee80211_hdrlen(hdr->frame_control);
814
c7ef38e0
CI		 815 pos = skb_push(skb, iv_len);
816 memmove(pos, pos + iv_len, hdrlen);
2475b1cc
MS		 817
818 return TX_CONTINUE;
819}
820
821static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len)
822{
823 int i;
824
825 /* pn is little endian */
826 for (i = len - 1; i >= 0; i--) {
827 if (pn1[i] < pn2[i])
828 return -1;
829 else if (pn1[i] > pn2[i])
830 return 1;
831 }
832
833 return 0;
834}
835
836static ieee80211_rx_result
837ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx)
838{
839 struct ieee80211_key *key = rx->key;
840 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
841 const struct ieee80211_cipher_scheme *cs = NULL;
842 int hdrlen = ieee80211_hdrlen(hdr->frame_control);
843 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb);
844 int data_len;
845 u8 *rx_pn;
846 u8 *skb_pn;
847 u8 qos_tid;
848
849 if (!rx->sta || !rx->sta->cipher_scheme ||
850 !(status->flag & RX_FLAG_DECRYPTED))
851 return RX_DROP_UNUSABLE;
852
853 if (!ieee80211_is_data(hdr->frame_control))
854 return RX_CONTINUE;
855
856 cs = rx->sta->cipher_scheme;
857
858 data_len = rx->skb->len - hdrlen - cs->hdr_len;
859
860 if (data_len < 0)
861 return RX_DROP_UNUSABLE;
862
863 if (ieee80211_is_data_qos(hdr->frame_control))
864 qos_tid = *ieee80211_get_qos_ctl(hdr) &
865 IEEE80211_QOS_CTL_TID_MASK;
866 else
867 qos_tid = 0;
868
869 if (skb_linearize(rx->skb))
870 return RX_DROP_UNUSABLE;
871
872 hdr = (struct ieee80211_hdr *)rx->skb->data;
873
874 rx_pn = key->u.gen.rx_pn[qos_tid];
875 skb_pn = rx->skb->data + hdrlen + cs->pn_off;
876
877 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0)
878 return RX_DROP_UNUSABLE;
879
880 memcpy(rx_pn, skb_pn, cs->pn_len);
881
882 /* remove security header and MIC */
883 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len))
884 return RX_DROP_UNUSABLE;
885
886 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen);
887 skb_pull(rx->skb, cs->hdr_len);
888
889 return RX_CONTINUE;
890}
765cb46a
JM		 891
892static void bip_aad(struct sk_buff *skb, u8 *aad)
893{
33766368
JM		 894 __le16 mask_fc;
895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
896
765cb46a
JM		 897 /* BIP AAD: FC(masked) || A1 || A2 || A3 */
898
899 /* FC type/subtype */
765cb46a 900 /* Mask FC Retry, PwrMgt, MoreData flags to zero */
33766368
JM		 901 mask_fc = hdr->frame_control;
902 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
903 IEEE80211_FCTL_MOREDATA);
904 put_unaligned(mask_fc, (__le16 *) &aad[0]);
765cb46a 905 /* A1 || A2 || A3 */
33766368 906 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN);
765cb46a
JM		 907}
908
909
75396ae6
JB		 910static inline void bip_ipn_set64(u8 *d, u64 pn)
911{
912 *d++ = pn;
913 *d++ = pn >> 8;
914 *d++ = pn >> 16;
915 *d++ = pn >> 24;
916 *d++ = pn >> 32;
917 *d = pn >> 40;
918}
919
765cb46a
JM		 920static inline void bip_ipn_swap(u8 *d, const u8 *s)
921{
922 *d++ = s[5];
923 *d++ = s[4];
924 *d++ = s[3];
925 *d++ = s[2];
926 *d++ = s[1];
927 *d = s[0];
928}
929
930
931ieee80211_tx_result
932ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
933{
252b86c4
JB		 934 struct sk_buff *skb;
935 struct ieee80211_tx_info *info;
765cb46a
JM		 936 struct ieee80211_key *key = tx->key;
937 struct ieee80211_mmie *mmie;
75396ae6
JB		 938 u8 aad[20];
939 u64 pn64;
765cb46a 940
252b86c4
JB		 941 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
942 return TX_DROP;
943
944 skb = skb_peek(&tx->skbs);
945
946 info = IEEE80211_SKB_CB(skb);
947
813d7669 948 if (info->control.hw_key)
252b86c4 949 return TX_CONTINUE;
765cb46a
JM		 950
951 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
952 return TX_DROP;
953
954 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
955 mmie->element_id = WLAN_EID_MMIE;
956 mmie->length = sizeof(*mmie) - 2;
957 mmie->key_id = cpu_to_le16(key->conf.keyidx);
958
959 /* PN = PN + 1 */
db388a56 960 pn64 = atomic64_inc_return(&key->conf.tx_pn);
765cb46a 961
75396ae6 962 bip_ipn_set64(mmie->sequence_number, pn64);
765cb46a
JM		 963
964 bip_aad(skb, aad);
965
966 /*
967 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
968 */
75396ae6
JB		 969 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
970 skb->data + 24, skb->len - 24, mmie->mic);
765cb46a
JM		 971
972 return TX_CONTINUE;
973}
974
56c52da2
JM		 975ieee80211_tx_result
976ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
977{
978 struct sk_buff *skb;
979 struct ieee80211_tx_info *info;
980 struct ieee80211_key *key = tx->key;
981 struct ieee80211_mmie_16 *mmie;
982 u8 aad[20];
983 u64 pn64;
984
985 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
986 return TX_DROP;
987
988 skb = skb_peek(&tx->skbs);
989
990 info = IEEE80211_SKB_CB(skb);
991
992 if (info->control.hw_key)
993 return TX_CONTINUE;
994
995 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
996 return TX_DROP;
997
998 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
999 mmie->element_id = WLAN_EID_MMIE;
1000 mmie->length = sizeof(*mmie) - 2;
1001 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1002
1003 /* PN = PN + 1 */
db388a56 1004 pn64 = atomic64_inc_return(&key->conf.tx_pn);
56c52da2
JM		 1005
1006 bip_ipn_set64(mmie->sequence_number, pn64);
1007
1008 bip_aad(skb, aad);
1009
1010 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
1011 */
1012 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1013 skb->data + 24, skb->len - 24, mmie->mic);
1014
1015 return TX_CONTINUE;
1016}
765cb46a
JM		 1017
1018ieee80211_rx_result
1019ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
1020{
1021 struct sk_buff *skb = rx->skb;
eb9fb5b8 1022 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
765cb46a
JM		 1023 struct ieee80211_key *key = rx->key;
1024 struct ieee80211_mmie *mmie;
1025 u8 aad[20], mic[8], ipn[6];
1026 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1027
1028 if (!ieee80211_is_mgmt(hdr->frame_control))
1029 return RX_CONTINUE;
1030
a8286911
JB		 1031 /* management frames are already linear */
1032
765cb46a
JM		 1033 if (skb->len < 24 + sizeof(*mmie))
1034 return RX_DROP_UNUSABLE;
1035
1036 mmie = (struct ieee80211_mmie *)
1037 (skb->data + skb->len - sizeof(*mmie));
1038 if (mmie->element_id != WLAN_EID_MMIE ||
1039 mmie->length != sizeof(*mmie) - 2)
1040 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1041
1042 bip_ipn_swap(ipn, mmie->sequence_number);
1043
1044 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1045 key->u.aes_cmac.replays++;
1046 return RX_DROP_UNUSABLE;
1047 }
1048
eb9fb5b8 1049 if (!(status->flag & RX_FLAG_DECRYPTED)) {
765cb46a
JM		 1050 /* hardware didn't decrypt/verify MIC */
1051 bip_aad(skb, aad);
75396ae6 1052 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
765cb46a
JM		 1053 skb->data + 24, skb->len - 24, mic);
1054 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1055 key->u.aes_cmac.icverrors++;
1056 return RX_DROP_UNUSABLE;
1057 }
1058 }
1059
1060 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1061
1062 /* Remove MMIE */
1063 skb_trim(skb, skb->len - sizeof(*mmie));
1064
1065 return RX_CONTINUE;
1066}
d32a1028 1067
56c52da2
JM		 1068ieee80211_rx_result
1069ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
1070{
1071 struct sk_buff *skb = rx->skb;
1072 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1073 struct ieee80211_key *key = rx->key;
1074 struct ieee80211_mmie_16 *mmie;
1075 u8 aad[20], mic[16], ipn[6];
1076 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1077
1078 if (!ieee80211_is_mgmt(hdr->frame_control))
1079 return RX_CONTINUE;
1080
1081 /* management frames are already linear */
1082
1083 if (skb->len < 24 + sizeof(*mmie))
1084 return RX_DROP_UNUSABLE;
1085
1086 mmie = (struct ieee80211_mmie_16 *)
1087 (skb->data + skb->len - sizeof(*mmie));
1088 if (mmie->element_id != WLAN_EID_MMIE ||
1089 mmie->length != sizeof(*mmie) - 2)
1090 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1091
1092 bip_ipn_swap(ipn, mmie->sequence_number);
1093
1094 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1095 key->u.aes_cmac.replays++;
1096 return RX_DROP_UNUSABLE;
1097 }
1098
1099 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1100 /* hardware didn't decrypt/verify MIC */
1101 bip_aad(skb, aad);
1102 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1103 skb->data + 24, skb->len - 24, mic);
1104 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1105 key->u.aes_cmac.icverrors++;
1106 return RX_DROP_UNUSABLE;
1107 }
1108 }
1109
1110 memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1111
1112 /* Remove MMIE */
1113 skb_trim(skb, skb->len - sizeof(*mmie));
1114
1115 return RX_CONTINUE;
1116}
1117
8ade538b
JM		 1118ieee80211_tx_result
1119ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1120{
1121 struct sk_buff *skb;
1122 struct ieee80211_tx_info *info;
1123 struct ieee80211_key *key = tx->key;
1124 struct ieee80211_mmie_16 *mmie;
1125 struct ieee80211_hdr *hdr;
1126 u8 aad[20];
1127 u64 pn64;
1128 u8 nonce[12];
1129
1130 if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1131 return TX_DROP;
1132
1133 skb = skb_peek(&tx->skbs);
1134
1135 info = IEEE80211_SKB_CB(skb);
1136
1137 if (info->control.hw_key)
1138 return TX_CONTINUE;
1139
1140 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1141 return TX_DROP;
1142
1143 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie));
1144 mmie->element_id = WLAN_EID_MMIE;
1145 mmie->length = sizeof(*mmie) - 2;
1146 mmie->key_id = cpu_to_le16(key->conf.keyidx);
1147
1148 /* PN = PN + 1 */
db388a56 1149 pn64 = atomic64_inc_return(&key->conf.tx_pn);
8ade538b
JM		 1150
1151 bip_ipn_set64(mmie->sequence_number, pn64);
1152
1153 bip_aad(skb, aad);
1154
1155 hdr = (struct ieee80211_hdr *)skb->data;
1156 memcpy(nonce, hdr->addr2, ETH_ALEN);
1157 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1158
1159 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1160 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1161 skb->data + 24, skb->len - 24, mmie->mic) < 0)
1162 return TX_DROP;
1163
1164 return TX_CONTINUE;
1165}
1166
1167ieee80211_rx_result
1168ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1169{
1170 struct sk_buff *skb = rx->skb;
1171 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1172 struct ieee80211_key *key = rx->key;
1173 struct ieee80211_mmie_16 *mmie;
1174 u8 aad[20], mic[16], ipn[6], nonce[12];
1175 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1176
1177 if (!ieee80211_is_mgmt(hdr->frame_control))
1178 return RX_CONTINUE;
1179
1180 /* management frames are already linear */
1181
1182 if (skb->len < 24 + sizeof(*mmie))
1183 return RX_DROP_UNUSABLE;
1184
1185 mmie = (struct ieee80211_mmie_16 *)
1186 (skb->data + skb->len - sizeof(*mmie));
1187 if (mmie->element_id != WLAN_EID_MMIE ||
1188 mmie->length != sizeof(*mmie) - 2)
1189 return RX_DROP_UNUSABLE; /* Invalid MMIE */
1190
1191 bip_ipn_swap(ipn, mmie->sequence_number);
1192
1193 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1194 key->u.aes_gmac.replays++;
1195 return RX_DROP_UNUSABLE;
1196 }
1197
1198 if (!(status->flag & RX_FLAG_DECRYPTED)) {
1199 /* hardware didn't decrypt/verify MIC */
1200 bip_aad(skb, aad);
1201
1202 memcpy(nonce, hdr->addr2, ETH_ALEN);
1203 memcpy(nonce + ETH_ALEN, ipn, 6);
1204
1205 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1206 skb->data + 24, skb->len - 24,
1207 mic) < 0 ||
1208 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
1209 key->u.aes_gmac.icverrors++;
1210 return RX_DROP_UNUSABLE;
1211 }
1212 }
1213
1214 memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1215
1216 /* Remove MMIE */
1217 skb_trim(skb, skb->len - sizeof(*mmie));
1218
1219 return RX_CONTINUE;
1220}
1221
d32a1028
YD		 1222ieee80211_tx_result
1223ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx)
1224{
1225 struct sk_buff *skb;
1226 struct ieee80211_tx_info *info = NULL;
2475b1cc 1227 ieee80211_tx_result res;
d32a1028
YD		 1228
1229 skb_queue_walk(&tx->skbs, skb) {
1230 info = IEEE80211_SKB_CB(skb);
1231
1232 /* handle hw-only algorithm */
1233 if (!info->control.hw_key)
1234 return TX_DROP;
2475b1cc 1235
c7ef38e0 1236 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) {
2475b1cc
MS		 1237 res = ieee80211_crypto_cs_encrypt(tx, skb);
1238 if (res != TX_CONTINUE)
1239 return res;
1240 }
d32a1028
YD		 1241 }
1242
1243 ieee80211_tx_set_protected(tx);
1244
1245 return TX_CONTINUE;
1246}
2475b1cc
MS		 1247
1248ieee80211_rx_result
1249ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx)
1250{
aeb136c5 1251 if (rx->sta && rx->sta->cipher_scheme)
2475b1cc
MS		 1252 return ieee80211_crypto_cs_decrypt(rx);
1253
1254 return RX_DROP_UNUSABLE;
1255}
Linux kernel - Deliverables
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