1 /* 2 * Copyright 2002-2004, Instant802 Networks, Inc. 3 * Copyright 2008, Jouni Malinen <j@w1.fi> 4 * Copyright (C) 2016 Intel Deutschland GmbH 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> 13 #include <linux/skbuff.h> 14 #include <linux/compiler.h> 15 #include <linux/ieee80211.h> 16 #include <linux/gfp.h> 17 #include <asm/unaligned.h> 18 #include <net/mac80211.h> 19 #include <crypto/aes.h> 20 21 #include "ieee80211_i.h" 22 #include "michael.h" 23 #include "tkip.h" 24 #include "aes_ccm.h" 25 #include "aes_cmac.h" 26 #include "aes_gmac.h" 27 #include "aes_gcm.h" 28 #include "wpa.h" 29 30 ieee80211_tx_result 31 ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) 32 { 33 u8 *data, *key, *mic; 34 size_t data_len; 35 unsigned int hdrlen; 36 struct ieee80211_hdr *hdr; 37 struct sk_buff *skb = tx->skb; 38 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 39 int tail; 40 41 hdr = (struct ieee80211_hdr *)skb->data; 42 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || 43 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) 44 return TX_CONTINUE; 45 46 hdrlen = ieee80211_hdrlen(hdr->frame_control); 47 if (skb->len < hdrlen) 48 return TX_DROP; 49 50 data = skb->data + hdrlen; 51 data_len = skb->len - hdrlen; 52 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 58 if (info->control.hw_key && 59 (info->flags & IEEE80211_TX_CTL_DONTFRAG || 60 tx->local->ops->set_frag_threshold) && 61 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { 62 /* hwaccel - with no need for SW-generated MMIC */ 63 return TX_CONTINUE; 64 } 65 66 tail = MICHAEL_MIC_LEN; 67 if (!info->control.hw_key) 68 tail += IEEE80211_TKIP_ICV_LEN; 69 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)) 75 return TX_DROP; 76 77 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; 78 mic = skb_put(skb, MICHAEL_MIC_LEN); 79 michael_mic(key, hdr, data, data_len, mic); 80 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) 81 mic[0]++; 82 83 return TX_CONTINUE; 84 } 85 86 87 ieee80211_rx_result 88 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) 89 { 90 u8 *data, *key = NULL; 91 size_t data_len; 92 unsigned int hdrlen; 93 u8 mic[MICHAEL_MIC_LEN]; 94 struct sk_buff *skb = rx->skb; 95 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 96 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 97 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)) 103 return RX_CONTINUE; 104 105 /* 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) 113 goto mic_fail_no_key; 114 115 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && 116 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) 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 */ 127 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || 128 !(status->flag & RX_FLAG_DECRYPTED)) 129 return RX_CONTINUE; 130 131 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 136 * frames in the BSS. 137 */ 138 return RX_DROP_UNUSABLE; 139 } 140 141 if (status->flag & RX_FLAG_MMIC_ERROR) 142 goto mic_fail; 143 144 hdrlen = ieee80211_hdrlen(hdr->frame_control); 145 if (skb->len < hdrlen + MICHAEL_MIC_LEN) 146 return RX_DROP_UNUSABLE; 147 148 if (skb_linearize(rx->skb)) 149 return RX_DROP_UNUSABLE; 150 hdr = (void *)skb->data; 151 152 data = skb->data + hdrlen; 153 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; 154 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; 155 michael_mic(key, hdr, data, data_len, mic); 156 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) 157 goto mic_fail; 158 159 /* remove Michael MIC from payload */ 160 skb_trim(skb, skb->len - MICHAEL_MIC_LEN); 161 162 update_iv: 163 /* update IV in key information to be able to detect replays */ 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; 166 167 return RX_CONTINUE; 168 169 mic_fail: 170 rx->key->u.tkip.mic_failures++; 171 172 mic_fail_no_key: 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 */ 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); 184 return RX_DROP_UNUSABLE; 185 } 186 187 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 188 { 189 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 190 struct ieee80211_key *key = tx->key; 191 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 192 unsigned int hdrlen; 193 int len, tail; 194 u64 pn; 195 u8 *pos; 196 197 if (info->control.hw_key && 198 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 199 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { 200 /* hwaccel - with no need for software-generated IV */ 201 return 0; 202 } 203 204 hdrlen = ieee80211_hdrlen(hdr->frame_control); 205 len = skb->len - hdrlen; 206 207 if (info->control.hw_key) 208 tail = 0; 209 else 210 tail = IEEE80211_TKIP_ICV_LEN; 211 212 if (WARN_ON(skb_tailroom(skb) < tail || 213 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) 214 return -1; 215 216 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); 217 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); 218 pos += hdrlen; 219 220 /* 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; 224 225 /* Increase IV for the frame */ 226 pn = atomic64_inc_return(&key->conf.tx_pn); 227 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); 228 229 /* hwaccel - with software IV */ 230 if (info->control.hw_key) 231 return 0; 232 233 /* Add room for ICV */ 234 skb_put(skb, IEEE80211_TKIP_ICV_LEN); 235 236 return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm, 237 key, skb, pos, len); 238 } 239 240 241 ieee80211_tx_result 242 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) 243 { 244 struct sk_buff *skb; 245 246 ieee80211_tx_set_protected(tx); 247 248 skb_queue_walk(&tx->skbs, skb) { 249 if (tkip_encrypt_skb(tx, skb) < 0) 250 return TX_DROP; 251 } 252 253 return TX_CONTINUE; 254 } 255 256 257 ieee80211_rx_result 258 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) 259 { 260 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; 261 int hdrlen, res, hwaccel = 0; 262 struct ieee80211_key *key = rx->key; 263 struct sk_buff *skb = rx->skb; 264 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 265 266 hdrlen = ieee80211_hdrlen(hdr->frame_control); 267 268 if (!ieee80211_is_data(hdr->frame_control)) 269 return RX_CONTINUE; 270 271 if (!rx->sta || skb->len - hdrlen < 12) 272 return RX_DROP_UNUSABLE; 273 274 /* 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; 278 279 /* 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) 285 hwaccel = 1; 286 287 res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm, 288 key, skb->data + hdrlen, 289 skb->len - hdrlen, rx->sta->sta.addr, 290 hdr->addr1, hwaccel, rx->security_idx, 291 &rx->tkip_iv32, 292 &rx->tkip_iv16); 293 if (res != TKIP_DECRYPT_OK) 294 return RX_DROP_UNUSABLE; 295 296 /* Trim ICV */ 297 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); 298 299 /* Remove IV */ 300 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); 301 skb_pull(skb, IEEE80211_TKIP_IV_LEN); 302 303 return RX_CONTINUE; 304 } 305 306 307 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) 308 { 309 __le16 mask_fc; 310 int a4_included, mgmt; 311 u8 qos_tid; 312 u16 len_a; 313 unsigned int hdrlen; 314 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 315 316 /* 317 * Mask FC: zero subtype b4 b5 b6 (if not mgmt) 318 * Retry, PwrMgt, MoreData; set Protected 319 */ 320 mgmt = ieee80211_is_mgmt(hdr->frame_control); 321 mask_fc = hdr->frame_control; 322 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | 323 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); 324 if (!mgmt) 325 mask_fc &= ~cpu_to_le16(0x0070); 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); 331 332 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; 336 337 /* 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; 345 346 /* 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); 350 memcpy(&b_0[2], hdr->addr2, ETH_ALEN); 351 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); 352 353 /* AAD (extra authenticate-only data) / masked 802.11 header 354 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ 355 put_unaligned_be16(len_a, &aad[0]); 356 put_unaligned(mask_fc, (__le16 *)&aad[2]); 357 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); 358 359 /* Mask Seq#, leave Frag# */ 360 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; 361 aad[23] = 0; 362 363 if (a4_included) { 364 memcpy(&aad[24], hdr->addr4, ETH_ALEN); 365 aad[30] = qos_tid; 366 aad[31] = 0; 367 } else { 368 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); 369 aad[24] = qos_tid; 370 } 371 } 372 373 374 static 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 } 385 386 387 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) 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]; 395 } 396 397 398 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, 399 unsigned int mic_len) 400 { 401 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 402 struct ieee80211_key *key = tx->key; 403 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 404 int hdrlen, len, tail; 405 u8 *pos; 406 u8 pn[6]; 407 u64 pn64; 408 u8 aad[2 * AES_BLOCK_SIZE]; 409 u8 b_0[AES_BLOCK_SIZE]; 410 411 if (info->control.hw_key && 412 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 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))) { 417 /* 418 * hwaccel has no need for preallocated room for CCMP 419 * header or MIC fields 420 */ 421 return 0; 422 } 423 424 hdrlen = ieee80211_hdrlen(hdr->frame_control); 425 len = skb->len - hdrlen; 426 427 if (info->control.hw_key) 428 tail = 0; 429 else 430 tail = mic_len; 431 432 if (WARN_ON(skb_tailroom(skb) < tail || 433 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) 434 return -1; 435 436 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); 437 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); 438 439 /* the HW only needs room for the IV, but not the actual IV */ 440 if (info->control.hw_key && 441 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 442 return 0; 443 444 hdr = (struct ieee80211_hdr *) pos; 445 pos += hdrlen; 446 447 pn64 = atomic64_inc_return(&key->conf.tx_pn); 448 449 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; 455 456 ccmp_pn2hdr(pos, pn, key->conf.keyidx); 457 458 /* hwaccel - with software CCMP header */ 459 if (info->control.hw_key) 460 return 0; 461 462 pos += IEEE80211_CCMP_HDR_LEN; 463 ccmp_special_blocks(skb, pn, b_0, aad); 464 ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, 465 skb_put(skb, mic_len), mic_len); 466 467 return 0; 468 } 469 470 471 ieee80211_tx_result 472 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, 473 unsigned int mic_len) 474 { 475 struct sk_buff *skb; 476 477 ieee80211_tx_set_protected(tx); 478 479 skb_queue_walk(&tx->skbs, skb) { 480 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) 481 return TX_DROP; 482 } 483 484 return TX_CONTINUE; 485 } 486 487 488 ieee80211_rx_result 489 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, 490 unsigned int mic_len) 491 { 492 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 493 int hdrlen; 494 struct ieee80211_key *key = rx->key; 495 struct sk_buff *skb = rx->skb; 496 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 497 u8 pn[IEEE80211_CCMP_PN_LEN]; 498 int data_len; 499 int queue; 500 501 hdrlen = ieee80211_hdrlen(hdr->frame_control); 502 503 if (!ieee80211_is_data(hdr->frame_control) && 504 !ieee80211_is_robust_mgmt_frame(skb)) 505 return RX_CONTINUE; 506 507 if (status->flag & RX_FLAG_DECRYPTED) { 508 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) 509 return RX_DROP_UNUSABLE; 510 if (status->flag & RX_FLAG_MIC_STRIPPED) 511 mic_len = 0; 512 } else { 513 if (skb_linearize(rx->skb)) 514 return RX_DROP_UNUSABLE; 515 } 516 517 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; 518 if (!rx->sta || data_len < 0) 519 return RX_DROP_UNUSABLE; 520 521 if (!(status->flag & RX_FLAG_PN_VALIDATED)) { 522 int res; 523 524 ccmp_hdr2pn(pn, skb->data + hdrlen); 525 526 queue = rx->security_idx; 527 528 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))) { 532 key->u.ccmp.replays++; 533 return RX_DROP_UNUSABLE; 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); 551 } 552 553 /* Remove CCMP header and MIC */ 554 if (pskb_trim(skb, skb->len - mic_len)) 555 return RX_DROP_UNUSABLE; 556 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); 557 skb_pull(skb, IEEE80211_CCMP_HDR_LEN); 558 559 return RX_CONTINUE; 560 } 561 562 static 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 } 610 611 static 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 } 622 623 static 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 } 632 633 static 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; 681 682 pn64 = atomic64_inc_return(&key->conf.tx_pn); 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 } 704 705 ieee80211_tx_result 706 ieee80211_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 } 719 720 ieee80211_rx_result 721 ieee80211_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]; 729 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; 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; 736 737 if (status->flag & RX_FLAG_DECRYPTED) { 738 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) 739 return RX_DROP_UNUSABLE; 740 if (status->flag & RX_FLAG_MIC_STRIPPED) 741 mic_len = 0; 742 } else { 743 if (skb_linearize(rx->skb)) 744 return RX_DROP_UNUSABLE; 745 } 746 747 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; 748 if (!rx->sta || data_len < 0) 749 return RX_DROP_UNUSABLE; 750 751 if (!(status->flag & RX_FLAG_PN_VALIDATED)) { 752 int res; 753 754 gcmp_hdr2pn(pn, skb->data + hdrlen); 755 756 queue = rx->security_idx; 757 758 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))) { 762 key->u.gcmp.replays++; 763 return RX_DROP_UNUSABLE; 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); 782 } 783 784 /* Remove GCMP header and MIC */ 785 if (pskb_trim(skb, skb->len - mic_len)) 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 } 792 793 static ieee80211_tx_result 794 ieee80211_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); 800 int hdrlen; 801 u8 *pos, iv_len = key->conf.iv_len; 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 } 808 809 if (unlikely(skb_headroom(skb) < iv_len && 810 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) 811 return TX_DROP; 812 813 hdrlen = ieee80211_hdrlen(hdr->frame_control); 814 815 pos = skb_push(skb, iv_len); 816 memmove(pos, pos + iv_len, hdrlen); 817 818 return TX_CONTINUE; 819 } 820 821 static 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 } 835 836 static ieee80211_rx_result 837 ieee80211_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 } 891 892 static void bip_aad(struct sk_buff *skb, u8 *aad) 893 { 894 __le16 mask_fc; 895 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 896 897 /* BIP AAD: FC(masked) || A1 || A2 || A3 */ 898 899 /* FC type/subtype */ 900 /* Mask FC Retry, PwrMgt, MoreData flags to zero */ 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]); 905 /* A1 || A2 || A3 */ 906 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); 907 } 908 909 910 static 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 } 919 920 static 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 } 929 930 931 ieee80211_tx_result 932 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) 933 { 934 struct sk_buff *skb; 935 struct ieee80211_tx_info *info; 936 struct ieee80211_key *key = tx->key; 937 struct ieee80211_mmie *mmie; 938 u8 aad[20]; 939 u64 pn64; 940 941 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); 947 948 if (info->control.hw_key) 949 return TX_CONTINUE; 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 */ 960 pn64 = atomic64_inc_return(&key->conf.tx_pn); 961 962 bip_ipn_set64(mmie->sequence_number, pn64); 963 964 bip_aad(skb, aad); 965 966 /* 967 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) 968 */ 969 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 970 skb->data + 24, skb->len - 24, mmie->mic); 971 972 return TX_CONTINUE; 973 } 974 975 ieee80211_tx_result 976 ieee80211_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 */ 1004 pn64 = atomic64_inc_return(&key->conf.tx_pn); 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 } 1017 1018 ieee80211_rx_result 1019 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) 1020 { 1021 struct sk_buff *skb = rx->skb; 1022 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 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 1031 /* management frames are already linear */ 1032 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 1049 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1050 /* hardware didn't decrypt/verify MIC */ 1051 bip_aad(skb, aad); 1052 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 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 } 1067 1068 ieee80211_rx_result 1069 ieee80211_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 1118 ieee80211_tx_result 1119 ieee80211_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 */ 1149 pn64 = atomic64_inc_return(&key->conf.tx_pn); 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 1167 ieee80211_rx_result 1168 ieee80211_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 1222 ieee80211_tx_result 1223 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) 1224 { 1225 struct sk_buff *skb; 1226 struct ieee80211_tx_info *info = NULL; 1227 ieee80211_tx_result res; 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; 1235 1236 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { 1237 res = ieee80211_crypto_cs_encrypt(tx, skb); 1238 if (res != TX_CONTINUE) 1239 return res; 1240 } 1241 } 1242 1243 ieee80211_tx_set_protected(tx); 1244 1245 return TX_CONTINUE; 1246 } 1247 1248 ieee80211_rx_result 1249 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) 1250 { 1251 if (rx->sta && rx->sta->cipher_scheme) 1252 return ieee80211_crypto_cs_decrypt(rx); 1253 1254 return RX_DROP_UNUSABLE; 1255 } 1256