1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2002-2004, Instant802 Networks, Inc. 4 * Copyright 2008, Jouni Malinen <j@w1.fi> 5 * Copyright (C) 2016-2017 Intel Deutschland GmbH 6 * Copyright (C) 2020-2021 Intel Corporation 7 */ 8 9 #include <linux/netdevice.h> 10 #include <linux/types.h> 11 #include <linux/skbuff.h> 12 #include <linux/compiler.h> 13 #include <linux/ieee80211.h> 14 #include <linux/gfp.h> 15 #include <asm/unaligned.h> 16 #include <net/mac80211.h> 17 #include <crypto/aes.h> 18 #include <crypto/algapi.h> 19 20 #include "ieee80211_i.h" 21 #include "michael.h" 22 #include "tkip.h" 23 #include "aes_ccm.h" 24 #include "aes_cmac.h" 25 #include "aes_gmac.h" 26 #include "aes_gcm.h" 27 #include "wpa.h" 28 29 ieee80211_tx_result 30 ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx) 31 { 32 u8 *data, *key, *mic; 33 size_t data_len; 34 unsigned int hdrlen; 35 struct ieee80211_hdr *hdr; 36 struct sk_buff *skb = tx->skb; 37 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 38 int tail; 39 40 hdr = (struct ieee80211_hdr *)skb->data; 41 if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || 42 skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control)) 43 return TX_CONTINUE; 44 45 hdrlen = ieee80211_hdrlen(hdr->frame_control); 46 if (skb->len < hdrlen) 47 return TX_DROP; 48 49 data = skb->data + hdrlen; 50 data_len = skb->len - hdrlen; 51 52 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) { 53 /* Need to use software crypto for the test */ 54 info->control.hw_key = NULL; 55 } 56 57 if (info->control.hw_key && 58 (info->flags & IEEE80211_TX_CTL_DONTFRAG || 59 ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) && 60 !(tx->key->conf.flags & (IEEE80211_KEY_FLAG_GENERATE_MMIC | 61 IEEE80211_KEY_FLAG_PUT_MIC_SPACE))) { 62 /* hwaccel - with no need for SW-generated MMIC or MIC space */ 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 mic = skb_put(skb, MICHAEL_MIC_LEN); 78 79 if (tx->key->conf.flags & IEEE80211_KEY_FLAG_PUT_MIC_SPACE) { 80 /* Zeroed MIC can help with debug */ 81 memset(mic, 0, MICHAEL_MIC_LEN); 82 return TX_CONTINUE; 83 } 84 85 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; 86 michael_mic(key, hdr, data, data_len, mic); 87 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) 88 mic[0]++; 89 90 return TX_CONTINUE; 91 } 92 93 94 ieee80211_rx_result 95 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) 96 { 97 u8 *data, *key = NULL; 98 size_t data_len; 99 unsigned int hdrlen; 100 u8 mic[MICHAEL_MIC_LEN]; 101 struct sk_buff *skb = rx->skb; 102 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 103 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 104 105 /* 106 * it makes no sense to check for MIC errors on anything other 107 * than data frames. 108 */ 109 if (!ieee80211_is_data_present(hdr->frame_control)) 110 return RX_CONTINUE; 111 112 /* 113 * No way to verify the MIC if the hardware stripped it or 114 * the IV with the key index. In this case we have solely rely 115 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a 116 * MIC failure report. 117 */ 118 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { 119 if (status->flag & RX_FLAG_MMIC_ERROR) 120 goto mic_fail_no_key; 121 122 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && 123 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) 124 goto update_iv; 125 126 return RX_CONTINUE; 127 } 128 129 /* 130 * Some hardware seems to generate Michael MIC failure reports; even 131 * though, the frame was not encrypted with TKIP and therefore has no 132 * MIC. Ignore the flag them to avoid triggering countermeasures. 133 */ 134 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || 135 !(status->flag & RX_FLAG_DECRYPTED)) 136 return RX_CONTINUE; 137 138 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { 139 /* 140 * APs with pairwise keys should never receive Michael MIC 141 * errors for non-zero keyidx because these are reserved for 142 * group keys and only the AP is sending real multicast 143 * frames in the BSS. 144 */ 145 return RX_DROP_UNUSABLE; 146 } 147 148 if (status->flag & RX_FLAG_MMIC_ERROR) 149 goto mic_fail; 150 151 hdrlen = ieee80211_hdrlen(hdr->frame_control); 152 if (skb->len < hdrlen + MICHAEL_MIC_LEN) 153 return RX_DROP_UNUSABLE; 154 155 if (skb_linearize(rx->skb)) 156 return RX_DROP_UNUSABLE; 157 hdr = (void *)skb->data; 158 159 data = skb->data + hdrlen; 160 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; 161 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; 162 michael_mic(key, hdr, data, data_len, mic); 163 if (crypto_memneq(mic, data + data_len, MICHAEL_MIC_LEN)) 164 goto mic_fail; 165 166 /* remove Michael MIC from payload */ 167 skb_trim(skb, skb->len - MICHAEL_MIC_LEN); 168 169 update_iv: 170 /* update IV in key information to be able to detect replays */ 171 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip.iv32; 172 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip.iv16; 173 174 return RX_CONTINUE; 175 176 mic_fail: 177 rx->key->u.tkip.mic_failures++; 178 179 mic_fail_no_key: 180 /* 181 * In some cases the key can be unset - e.g. a multicast packet, in 182 * a driver that supports HW encryption. Send up the key idx only if 183 * the key is set. 184 */ 185 cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2, 186 is_multicast_ether_addr(hdr->addr1) ? 187 NL80211_KEYTYPE_GROUP : 188 NL80211_KEYTYPE_PAIRWISE, 189 rx->key ? rx->key->conf.keyidx : -1, 190 NULL, GFP_ATOMIC); 191 return RX_DROP_UNUSABLE; 192 } 193 194 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 195 { 196 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 197 struct ieee80211_key *key = tx->key; 198 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 199 unsigned int hdrlen; 200 int len, tail; 201 u64 pn; 202 u8 *pos; 203 204 if (info->control.hw_key && 205 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 206 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { 207 /* hwaccel - with no need for software-generated IV */ 208 return 0; 209 } 210 211 hdrlen = ieee80211_hdrlen(hdr->frame_control); 212 len = skb->len - hdrlen; 213 214 if (info->control.hw_key) 215 tail = 0; 216 else 217 tail = IEEE80211_TKIP_ICV_LEN; 218 219 if (WARN_ON(skb_tailroom(skb) < tail || 220 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) 221 return -1; 222 223 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); 224 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); 225 pos += hdrlen; 226 227 /* the HW only needs room for the IV, but not the actual IV */ 228 if (info->control.hw_key && 229 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 230 return 0; 231 232 /* Increase IV for the frame */ 233 pn = atomic64_inc_return(&key->conf.tx_pn); 234 pos = ieee80211_tkip_add_iv(pos, &key->conf, pn); 235 236 /* hwaccel - with software IV */ 237 if (info->control.hw_key) 238 return 0; 239 240 /* Add room for ICV */ 241 skb_put(skb, IEEE80211_TKIP_ICV_LEN); 242 243 return ieee80211_tkip_encrypt_data(&tx->local->wep_tx_ctx, 244 key, skb, pos, len); 245 } 246 247 248 ieee80211_tx_result 249 ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx) 250 { 251 struct sk_buff *skb; 252 253 ieee80211_tx_set_protected(tx); 254 255 skb_queue_walk(&tx->skbs, skb) { 256 if (tkip_encrypt_skb(tx, skb) < 0) 257 return TX_DROP; 258 } 259 260 return TX_CONTINUE; 261 } 262 263 264 ieee80211_rx_result 265 ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx) 266 { 267 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data; 268 int hdrlen, res, hwaccel = 0; 269 struct ieee80211_key *key = rx->key; 270 struct sk_buff *skb = rx->skb; 271 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 272 273 hdrlen = ieee80211_hdrlen(hdr->frame_control); 274 275 if (!ieee80211_is_data(hdr->frame_control)) 276 return RX_CONTINUE; 277 278 if (!rx->sta || skb->len - hdrlen < 12) 279 return RX_DROP_UNUSABLE; 280 281 /* it may be possible to optimize this a bit more */ 282 if (skb_linearize(rx->skb)) 283 return RX_DROP_UNUSABLE; 284 hdr = (void *)skb->data; 285 286 /* 287 * Let TKIP code verify IV, but skip decryption. 288 * In the case where hardware checks the IV as well, 289 * we don't even get here, see ieee80211_rx_h_decrypt() 290 */ 291 if (status->flag & RX_FLAG_DECRYPTED) 292 hwaccel = 1; 293 294 res = ieee80211_tkip_decrypt_data(&rx->local->wep_rx_ctx, 295 key, skb->data + hdrlen, 296 skb->len - hdrlen, rx->sta->sta.addr, 297 hdr->addr1, hwaccel, rx->security_idx, 298 &rx->tkip.iv32, 299 &rx->tkip.iv16); 300 if (res != TKIP_DECRYPT_OK) 301 return RX_DROP_UNUSABLE; 302 303 /* Trim ICV */ 304 if (!(status->flag & RX_FLAG_ICV_STRIPPED)) 305 skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN); 306 307 /* Remove IV */ 308 memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen); 309 skb_pull(skb, IEEE80211_TKIP_IV_LEN); 310 311 return RX_CONTINUE; 312 } 313 314 315 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad) 316 { 317 __le16 mask_fc; 318 int a4_included, mgmt; 319 u8 qos_tid; 320 u16 len_a; 321 unsigned int hdrlen; 322 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 323 324 /* 325 * Mask FC: zero subtype b4 b5 b6 (if not mgmt) 326 * Retry, PwrMgt, MoreData; set Protected 327 */ 328 mgmt = ieee80211_is_mgmt(hdr->frame_control); 329 mask_fc = hdr->frame_control; 330 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | 331 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); 332 if (!mgmt) 333 mask_fc &= ~cpu_to_le16(0x0070); 334 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 335 336 hdrlen = ieee80211_hdrlen(hdr->frame_control); 337 len_a = hdrlen - 2; 338 a4_included = ieee80211_has_a4(hdr->frame_control); 339 340 if (ieee80211_is_data_qos(hdr->frame_control)) 341 qos_tid = ieee80211_get_tid(hdr); 342 else 343 qos_tid = 0; 344 345 /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC 346 * mode authentication are not allowed to collide, yet both are derived 347 * from this vector b_0. We only set L := 1 here to indicate that the 348 * data size can be represented in (L+1) bytes. The CCM layer will take 349 * care of storing the data length in the top (L+1) bytes and setting 350 * and clearing the other bits as is required to derive the two IVs. 351 */ 352 b_0[0] = 0x1; 353 354 /* Nonce: Nonce Flags | A2 | PN 355 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7) 356 */ 357 b_0[1] = qos_tid | (mgmt << 4); 358 memcpy(&b_0[2], hdr->addr2, ETH_ALEN); 359 memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN); 360 361 /* AAD (extra authenticate-only data) / masked 802.11 header 362 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */ 363 put_unaligned_be16(len_a, &aad[0]); 364 put_unaligned(mask_fc, (__le16 *)&aad[2]); 365 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); 366 367 /* Mask Seq#, leave Frag# */ 368 aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f; 369 aad[23] = 0; 370 371 if (a4_included) { 372 memcpy(&aad[24], hdr->addr4, ETH_ALEN); 373 aad[30] = qos_tid; 374 aad[31] = 0; 375 } else { 376 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); 377 aad[24] = qos_tid; 378 } 379 } 380 381 382 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id) 383 { 384 hdr[0] = pn[5]; 385 hdr[1] = pn[4]; 386 hdr[2] = 0; 387 hdr[3] = 0x20 | (key_id << 6); 388 hdr[4] = pn[3]; 389 hdr[5] = pn[2]; 390 hdr[6] = pn[1]; 391 hdr[7] = pn[0]; 392 } 393 394 395 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr) 396 { 397 pn[0] = hdr[7]; 398 pn[1] = hdr[6]; 399 pn[2] = hdr[5]; 400 pn[3] = hdr[4]; 401 pn[4] = hdr[1]; 402 pn[5] = hdr[0]; 403 } 404 405 406 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb, 407 unsigned int mic_len) 408 { 409 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 410 struct ieee80211_key *key = tx->key; 411 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 412 int hdrlen, len, tail; 413 u8 *pos; 414 u8 pn[6]; 415 u64 pn64; 416 u8 aad[CCM_AAD_LEN]; 417 u8 b_0[AES_BLOCK_SIZE]; 418 419 if (info->control.hw_key && 420 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 421 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 422 !((info->control.hw_key->flags & 423 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && 424 ieee80211_is_mgmt(hdr->frame_control))) { 425 /* 426 * hwaccel has no need for preallocated room for CCMP 427 * header or MIC fields 428 */ 429 return 0; 430 } 431 432 hdrlen = ieee80211_hdrlen(hdr->frame_control); 433 len = skb->len - hdrlen; 434 435 if (info->control.hw_key) 436 tail = 0; 437 else 438 tail = mic_len; 439 440 if (WARN_ON(skb_tailroom(skb) < tail || 441 skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN)) 442 return -1; 443 444 pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN); 445 memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen); 446 447 /* the HW only needs room for the IV, but not the actual IV */ 448 if (info->control.hw_key && 449 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 450 return 0; 451 452 pos += hdrlen; 453 454 pn64 = atomic64_inc_return(&key->conf.tx_pn); 455 456 pn[5] = pn64; 457 pn[4] = pn64 >> 8; 458 pn[3] = pn64 >> 16; 459 pn[2] = pn64 >> 24; 460 pn[1] = pn64 >> 32; 461 pn[0] = pn64 >> 40; 462 463 ccmp_pn2hdr(pos, pn, key->conf.keyidx); 464 465 /* hwaccel - with software CCMP header */ 466 if (info->control.hw_key) 467 return 0; 468 469 pos += IEEE80211_CCMP_HDR_LEN; 470 ccmp_special_blocks(skb, pn, b_0, aad); 471 return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len, 472 skb_put(skb, mic_len)); 473 } 474 475 476 ieee80211_tx_result 477 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx, 478 unsigned int mic_len) 479 { 480 struct sk_buff *skb; 481 482 ieee80211_tx_set_protected(tx); 483 484 skb_queue_walk(&tx->skbs, skb) { 485 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0) 486 return TX_DROP; 487 } 488 489 return TX_CONTINUE; 490 } 491 492 493 ieee80211_rx_result 494 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx, 495 unsigned int mic_len) 496 { 497 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 498 int hdrlen; 499 struct ieee80211_key *key = rx->key; 500 struct sk_buff *skb = rx->skb; 501 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 502 u8 pn[IEEE80211_CCMP_PN_LEN]; 503 int data_len; 504 int queue; 505 506 hdrlen = ieee80211_hdrlen(hdr->frame_control); 507 508 if (!ieee80211_is_data(hdr->frame_control) && 509 !ieee80211_is_robust_mgmt_frame(skb)) 510 return RX_CONTINUE; 511 512 if (status->flag & RX_FLAG_DECRYPTED) { 513 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) 514 return RX_DROP_UNUSABLE; 515 if (status->flag & RX_FLAG_MIC_STRIPPED) 516 mic_len = 0; 517 } else { 518 if (skb_linearize(rx->skb)) 519 return RX_DROP_UNUSABLE; 520 } 521 522 /* reload hdr - skb might have been reallocated */ 523 hdr = (void *)rx->skb->data; 524 525 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; 526 if (!rx->sta || data_len < 0) 527 return RX_DROP_UNUSABLE; 528 529 if (!(status->flag & RX_FLAG_PN_VALIDATED)) { 530 int res; 531 532 ccmp_hdr2pn(pn, skb->data + hdrlen); 533 534 queue = rx->security_idx; 535 536 res = memcmp(pn, key->u.ccmp.rx_pn[queue], 537 IEEE80211_CCMP_PN_LEN); 538 if (res < 0 || 539 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { 540 key->u.ccmp.replays++; 541 return RX_DROP_UNUSABLE; 542 } 543 544 if (!(status->flag & RX_FLAG_DECRYPTED)) { 545 u8 aad[2 * AES_BLOCK_SIZE]; 546 u8 b_0[AES_BLOCK_SIZE]; 547 /* hardware didn't decrypt/verify MIC */ 548 ccmp_special_blocks(skb, pn, b_0, aad); 549 550 if (ieee80211_aes_ccm_decrypt( 551 key->u.ccmp.tfm, b_0, aad, 552 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, 553 data_len, 554 skb->data + skb->len - mic_len)) 555 return RX_DROP_UNUSABLE; 556 } 557 558 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); 559 if (unlikely(ieee80211_is_frag(hdr))) 560 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN); 561 } 562 563 /* Remove CCMP header and MIC */ 564 if (pskb_trim(skb, skb->len - mic_len)) 565 return RX_DROP_UNUSABLE; 566 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); 567 skb_pull(skb, IEEE80211_CCMP_HDR_LEN); 568 569 return RX_CONTINUE; 570 } 571 572 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) 573 { 574 __le16 mask_fc; 575 u8 qos_tid; 576 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 577 578 memcpy(j_0, hdr->addr2, ETH_ALEN); 579 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); 580 j_0[13] = 0; 581 j_0[14] = 0; 582 j_0[AES_BLOCK_SIZE - 1] = 0x01; 583 584 /* AAD (extra authenticate-only data) / masked 802.11 header 585 * FC | A1 | A2 | A3 | SC | [A4] | [QC] 586 */ 587 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); 588 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) 589 * Retry, PwrMgt, MoreData; set Protected 590 */ 591 mask_fc = hdr->frame_control; 592 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | 593 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); 594 if (!ieee80211_is_mgmt(hdr->frame_control)) 595 mask_fc &= ~cpu_to_le16(0x0070); 596 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 597 598 put_unaligned(mask_fc, (__le16 *)&aad[2]); 599 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); 600 601 /* Mask Seq#, leave Frag# */ 602 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; 603 aad[23] = 0; 604 605 if (ieee80211_is_data_qos(hdr->frame_control)) 606 qos_tid = ieee80211_get_tid(hdr); 607 else 608 qos_tid = 0; 609 610 if (ieee80211_has_a4(hdr->frame_control)) { 611 memcpy(&aad[24], hdr->addr4, ETH_ALEN); 612 aad[30] = qos_tid; 613 aad[31] = 0; 614 } else { 615 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); 616 aad[24] = qos_tid; 617 } 618 } 619 620 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) 621 { 622 hdr[0] = pn[5]; 623 hdr[1] = pn[4]; 624 hdr[2] = 0; 625 hdr[3] = 0x20 | (key_id << 6); 626 hdr[4] = pn[3]; 627 hdr[5] = pn[2]; 628 hdr[6] = pn[1]; 629 hdr[7] = pn[0]; 630 } 631 632 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) 633 { 634 pn[0] = hdr[7]; 635 pn[1] = hdr[6]; 636 pn[2] = hdr[5]; 637 pn[3] = hdr[4]; 638 pn[4] = hdr[1]; 639 pn[5] = hdr[0]; 640 } 641 642 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 643 { 644 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 645 struct ieee80211_key *key = tx->key; 646 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 647 int hdrlen, len, tail; 648 u8 *pos; 649 u8 pn[6]; 650 u64 pn64; 651 u8 aad[GCM_AAD_LEN]; 652 u8 j_0[AES_BLOCK_SIZE]; 653 654 if (info->control.hw_key && 655 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 656 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 657 !((info->control.hw_key->flags & 658 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && 659 ieee80211_is_mgmt(hdr->frame_control))) { 660 /* hwaccel has no need for preallocated room for GCMP 661 * header or MIC fields 662 */ 663 return 0; 664 } 665 666 hdrlen = ieee80211_hdrlen(hdr->frame_control); 667 len = skb->len - hdrlen; 668 669 if (info->control.hw_key) 670 tail = 0; 671 else 672 tail = IEEE80211_GCMP_MIC_LEN; 673 674 if (WARN_ON(skb_tailroom(skb) < tail || 675 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) 676 return -1; 677 678 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); 679 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); 680 skb_set_network_header(skb, skb_network_offset(skb) + 681 IEEE80211_GCMP_HDR_LEN); 682 683 /* the HW only needs room for the IV, but not the actual IV */ 684 if (info->control.hw_key && 685 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 686 return 0; 687 688 pos += hdrlen; 689 690 pn64 = atomic64_inc_return(&key->conf.tx_pn); 691 692 pn[5] = pn64; 693 pn[4] = pn64 >> 8; 694 pn[3] = pn64 >> 16; 695 pn[2] = pn64 >> 24; 696 pn[1] = pn64 >> 32; 697 pn[0] = pn64 >> 40; 698 699 gcmp_pn2hdr(pos, pn, key->conf.keyidx); 700 701 /* hwaccel - with software GCMP header */ 702 if (info->control.hw_key) 703 return 0; 704 705 pos += IEEE80211_GCMP_HDR_LEN; 706 gcmp_special_blocks(skb, pn, j_0, aad); 707 return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, 708 skb_put(skb, IEEE80211_GCMP_MIC_LEN)); 709 } 710 711 ieee80211_tx_result 712 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) 713 { 714 struct sk_buff *skb; 715 716 ieee80211_tx_set_protected(tx); 717 718 skb_queue_walk(&tx->skbs, skb) { 719 if (gcmp_encrypt_skb(tx, skb) < 0) 720 return TX_DROP; 721 } 722 723 return TX_CONTINUE; 724 } 725 726 ieee80211_rx_result 727 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) 728 { 729 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 730 int hdrlen; 731 struct ieee80211_key *key = rx->key; 732 struct sk_buff *skb = rx->skb; 733 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 734 u8 pn[IEEE80211_GCMP_PN_LEN]; 735 int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN; 736 737 hdrlen = ieee80211_hdrlen(hdr->frame_control); 738 739 if (!ieee80211_is_data(hdr->frame_control) && 740 !ieee80211_is_robust_mgmt_frame(skb)) 741 return RX_CONTINUE; 742 743 if (status->flag & RX_FLAG_DECRYPTED) { 744 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) 745 return RX_DROP_UNUSABLE; 746 if (status->flag & RX_FLAG_MIC_STRIPPED) 747 mic_len = 0; 748 } else { 749 if (skb_linearize(rx->skb)) 750 return RX_DROP_UNUSABLE; 751 } 752 753 /* reload hdr - skb might have been reallocated */ 754 hdr = (void *)rx->skb->data; 755 756 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len; 757 if (!rx->sta || data_len < 0) 758 return RX_DROP_UNUSABLE; 759 760 if (!(status->flag & RX_FLAG_PN_VALIDATED)) { 761 int res; 762 763 gcmp_hdr2pn(pn, skb->data + hdrlen); 764 765 queue = rx->security_idx; 766 767 res = memcmp(pn, key->u.gcmp.rx_pn[queue], 768 IEEE80211_GCMP_PN_LEN); 769 if (res < 0 || 770 (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) { 771 key->u.gcmp.replays++; 772 return RX_DROP_UNUSABLE; 773 } 774 775 if (!(status->flag & RX_FLAG_DECRYPTED)) { 776 u8 aad[2 * AES_BLOCK_SIZE]; 777 u8 j_0[AES_BLOCK_SIZE]; 778 /* hardware didn't decrypt/verify MIC */ 779 gcmp_special_blocks(skb, pn, j_0, aad); 780 781 if (ieee80211_aes_gcm_decrypt( 782 key->u.gcmp.tfm, j_0, aad, 783 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, 784 data_len, 785 skb->data + skb->len - 786 IEEE80211_GCMP_MIC_LEN)) 787 return RX_DROP_UNUSABLE; 788 } 789 790 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); 791 if (unlikely(ieee80211_is_frag(hdr))) 792 memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN); 793 } 794 795 /* Remove GCMP header and MIC */ 796 if (pskb_trim(skb, skb->len - mic_len)) 797 return RX_DROP_UNUSABLE; 798 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); 799 skb_pull(skb, IEEE80211_GCMP_HDR_LEN); 800 801 return RX_CONTINUE; 802 } 803 804 static ieee80211_tx_result 805 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, 806 struct sk_buff *skb) 807 { 808 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 809 struct ieee80211_key *key = tx->key; 810 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 811 int hdrlen; 812 u8 *pos, iv_len = key->conf.iv_len; 813 814 if (info->control.hw_key && 815 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { 816 /* hwaccel has no need for preallocated head room */ 817 return TX_CONTINUE; 818 } 819 820 if (unlikely(skb_headroom(skb) < iv_len && 821 pskb_expand_head(skb, iv_len, 0, GFP_ATOMIC))) 822 return TX_DROP; 823 824 hdrlen = ieee80211_hdrlen(hdr->frame_control); 825 826 pos = skb_push(skb, iv_len); 827 memmove(pos, pos + iv_len, hdrlen); 828 829 return TX_CONTINUE; 830 } 831 832 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) 833 { 834 int i; 835 836 /* pn is little endian */ 837 for (i = len - 1; i >= 0; i--) { 838 if (pn1[i] < pn2[i]) 839 return -1; 840 else if (pn1[i] > pn2[i]) 841 return 1; 842 } 843 844 return 0; 845 } 846 847 static ieee80211_rx_result 848 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) 849 { 850 struct ieee80211_key *key = rx->key; 851 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 852 const struct ieee80211_cipher_scheme *cs = NULL; 853 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 854 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 855 int data_len; 856 u8 *rx_pn; 857 u8 *skb_pn; 858 u8 qos_tid; 859 860 if (!rx->sta || !rx->sta->cipher_scheme || 861 !(status->flag & RX_FLAG_DECRYPTED)) 862 return RX_DROP_UNUSABLE; 863 864 if (!ieee80211_is_data(hdr->frame_control)) 865 return RX_CONTINUE; 866 867 cs = rx->sta->cipher_scheme; 868 869 data_len = rx->skb->len - hdrlen - cs->hdr_len; 870 871 if (data_len < 0) 872 return RX_DROP_UNUSABLE; 873 874 if (ieee80211_is_data_qos(hdr->frame_control)) 875 qos_tid = ieee80211_get_tid(hdr); 876 else 877 qos_tid = 0; 878 879 if (skb_linearize(rx->skb)) 880 return RX_DROP_UNUSABLE; 881 882 rx_pn = key->u.gen.rx_pn[qos_tid]; 883 skb_pn = rx->skb->data + hdrlen + cs->pn_off; 884 885 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) 886 return RX_DROP_UNUSABLE; 887 888 memcpy(rx_pn, skb_pn, cs->pn_len); 889 890 /* remove security header and MIC */ 891 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) 892 return RX_DROP_UNUSABLE; 893 894 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); 895 skb_pull(rx->skb, cs->hdr_len); 896 897 return RX_CONTINUE; 898 } 899 900 static void bip_aad(struct sk_buff *skb, u8 *aad) 901 { 902 __le16 mask_fc; 903 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 904 905 /* BIP AAD: FC(masked) || A1 || A2 || A3 */ 906 907 /* FC type/subtype */ 908 /* Mask FC Retry, PwrMgt, MoreData flags to zero */ 909 mask_fc = hdr->frame_control; 910 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | 911 IEEE80211_FCTL_MOREDATA); 912 put_unaligned(mask_fc, (__le16 *) &aad[0]); 913 /* A1 || A2 || A3 */ 914 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); 915 } 916 917 918 static inline void bip_ipn_set64(u8 *d, u64 pn) 919 { 920 *d++ = pn; 921 *d++ = pn >> 8; 922 *d++ = pn >> 16; 923 *d++ = pn >> 24; 924 *d++ = pn >> 32; 925 *d = pn >> 40; 926 } 927 928 static inline void bip_ipn_swap(u8 *d, const u8 *s) 929 { 930 *d++ = s[5]; 931 *d++ = s[4]; 932 *d++ = s[3]; 933 *d++ = s[2]; 934 *d++ = s[1]; 935 *d = s[0]; 936 } 937 938 939 ieee80211_tx_result 940 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) 941 { 942 struct sk_buff *skb; 943 struct ieee80211_tx_info *info; 944 struct ieee80211_key *key = tx->key; 945 struct ieee80211_mmie *mmie; 946 u8 aad[20]; 947 u64 pn64; 948 949 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 950 return TX_DROP; 951 952 skb = skb_peek(&tx->skbs); 953 954 info = IEEE80211_SKB_CB(skb); 955 956 if (info->control.hw_key && 957 !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE)) 958 return TX_CONTINUE; 959 960 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 961 return TX_DROP; 962 963 mmie = skb_put(skb, sizeof(*mmie)); 964 mmie->element_id = WLAN_EID_MMIE; 965 mmie->length = sizeof(*mmie) - 2; 966 mmie->key_id = cpu_to_le16(key->conf.keyidx); 967 968 /* PN = PN + 1 */ 969 pn64 = atomic64_inc_return(&key->conf.tx_pn); 970 971 bip_ipn_set64(mmie->sequence_number, pn64); 972 973 if (info->control.hw_key) 974 return TX_CONTINUE; 975 976 bip_aad(skb, aad); 977 978 /* 979 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) 980 */ 981 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 982 skb->data + 24, skb->len - 24, mmie->mic); 983 984 return TX_CONTINUE; 985 } 986 987 ieee80211_tx_result 988 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) 989 { 990 struct sk_buff *skb; 991 struct ieee80211_tx_info *info; 992 struct ieee80211_key *key = tx->key; 993 struct ieee80211_mmie_16 *mmie; 994 u8 aad[20]; 995 u64 pn64; 996 997 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 998 return TX_DROP; 999 1000 skb = skb_peek(&tx->skbs); 1001 1002 info = IEEE80211_SKB_CB(skb); 1003 1004 if (info->control.hw_key) 1005 return TX_CONTINUE; 1006 1007 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 1008 return TX_DROP; 1009 1010 mmie = skb_put(skb, sizeof(*mmie)); 1011 mmie->element_id = WLAN_EID_MMIE; 1012 mmie->length = sizeof(*mmie) - 2; 1013 mmie->key_id = cpu_to_le16(key->conf.keyidx); 1014 1015 /* PN = PN + 1 */ 1016 pn64 = atomic64_inc_return(&key->conf.tx_pn); 1017 1018 bip_ipn_set64(mmie->sequence_number, pn64); 1019 1020 bip_aad(skb, aad); 1021 1022 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) 1023 */ 1024 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, 1025 skb->data + 24, skb->len - 24, mmie->mic); 1026 1027 return TX_CONTINUE; 1028 } 1029 1030 ieee80211_rx_result 1031 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) 1032 { 1033 struct sk_buff *skb = rx->skb; 1034 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1035 struct ieee80211_key *key = rx->key; 1036 struct ieee80211_mmie *mmie; 1037 u8 aad[20], mic[8], ipn[6]; 1038 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1039 1040 if (!ieee80211_is_mgmt(hdr->frame_control)) 1041 return RX_CONTINUE; 1042 1043 /* management frames are already linear */ 1044 1045 if (skb->len < 24 + sizeof(*mmie)) 1046 return RX_DROP_UNUSABLE; 1047 1048 mmie = (struct ieee80211_mmie *) 1049 (skb->data + skb->len - sizeof(*mmie)); 1050 if (mmie->element_id != WLAN_EID_MMIE || 1051 mmie->length != sizeof(*mmie) - 2) 1052 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1053 1054 bip_ipn_swap(ipn, mmie->sequence_number); 1055 1056 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { 1057 key->u.aes_cmac.replays++; 1058 return RX_DROP_UNUSABLE; 1059 } 1060 1061 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1062 /* hardware didn't decrypt/verify MIC */ 1063 bip_aad(skb, aad); 1064 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 1065 skb->data + 24, skb->len - 24, mic); 1066 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { 1067 key->u.aes_cmac.icverrors++; 1068 return RX_DROP_UNUSABLE; 1069 } 1070 } 1071 1072 memcpy(key->u.aes_cmac.rx_pn, ipn, 6); 1073 1074 /* Remove MMIE */ 1075 skb_trim(skb, skb->len - sizeof(*mmie)); 1076 1077 return RX_CONTINUE; 1078 } 1079 1080 ieee80211_rx_result 1081 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) 1082 { 1083 struct sk_buff *skb = rx->skb; 1084 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1085 struct ieee80211_key *key = rx->key; 1086 struct ieee80211_mmie_16 *mmie; 1087 u8 aad[20], mic[16], ipn[6]; 1088 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1089 1090 if (!ieee80211_is_mgmt(hdr->frame_control)) 1091 return RX_CONTINUE; 1092 1093 /* management frames are already linear */ 1094 1095 if (skb->len < 24 + sizeof(*mmie)) 1096 return RX_DROP_UNUSABLE; 1097 1098 mmie = (struct ieee80211_mmie_16 *) 1099 (skb->data + skb->len - sizeof(*mmie)); 1100 if (mmie->element_id != WLAN_EID_MMIE || 1101 mmie->length != sizeof(*mmie) - 2) 1102 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1103 1104 bip_ipn_swap(ipn, mmie->sequence_number); 1105 1106 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { 1107 key->u.aes_cmac.replays++; 1108 return RX_DROP_UNUSABLE; 1109 } 1110 1111 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1112 /* hardware didn't decrypt/verify MIC */ 1113 bip_aad(skb, aad); 1114 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, 1115 skb->data + 24, skb->len - 24, mic); 1116 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { 1117 key->u.aes_cmac.icverrors++; 1118 return RX_DROP_UNUSABLE; 1119 } 1120 } 1121 1122 memcpy(key->u.aes_cmac.rx_pn, ipn, 6); 1123 1124 /* Remove MMIE */ 1125 skb_trim(skb, skb->len - sizeof(*mmie)); 1126 1127 return RX_CONTINUE; 1128 } 1129 1130 ieee80211_tx_result 1131 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) 1132 { 1133 struct sk_buff *skb; 1134 struct ieee80211_tx_info *info; 1135 struct ieee80211_key *key = tx->key; 1136 struct ieee80211_mmie_16 *mmie; 1137 struct ieee80211_hdr *hdr; 1138 u8 aad[GMAC_AAD_LEN]; 1139 u64 pn64; 1140 u8 nonce[GMAC_NONCE_LEN]; 1141 1142 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 1143 return TX_DROP; 1144 1145 skb = skb_peek(&tx->skbs); 1146 1147 info = IEEE80211_SKB_CB(skb); 1148 1149 if (info->control.hw_key) 1150 return TX_CONTINUE; 1151 1152 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 1153 return TX_DROP; 1154 1155 mmie = skb_put(skb, sizeof(*mmie)); 1156 mmie->element_id = WLAN_EID_MMIE; 1157 mmie->length = sizeof(*mmie) - 2; 1158 mmie->key_id = cpu_to_le16(key->conf.keyidx); 1159 1160 /* PN = PN + 1 */ 1161 pn64 = atomic64_inc_return(&key->conf.tx_pn); 1162 1163 bip_ipn_set64(mmie->sequence_number, pn64); 1164 1165 bip_aad(skb, aad); 1166 1167 hdr = (struct ieee80211_hdr *)skb->data; 1168 memcpy(nonce, hdr->addr2, ETH_ALEN); 1169 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); 1170 1171 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ 1172 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, 1173 skb->data + 24, skb->len - 24, mmie->mic) < 0) 1174 return TX_DROP; 1175 1176 return TX_CONTINUE; 1177 } 1178 1179 ieee80211_rx_result 1180 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) 1181 { 1182 struct sk_buff *skb = rx->skb; 1183 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1184 struct ieee80211_key *key = rx->key; 1185 struct ieee80211_mmie_16 *mmie; 1186 u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN]; 1187 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1188 1189 if (!ieee80211_is_mgmt(hdr->frame_control)) 1190 return RX_CONTINUE; 1191 1192 /* management frames are already linear */ 1193 1194 if (skb->len < 24 + sizeof(*mmie)) 1195 return RX_DROP_UNUSABLE; 1196 1197 mmie = (struct ieee80211_mmie_16 *) 1198 (skb->data + skb->len - sizeof(*mmie)); 1199 if (mmie->element_id != WLAN_EID_MMIE || 1200 mmie->length != sizeof(*mmie) - 2) 1201 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1202 1203 bip_ipn_swap(ipn, mmie->sequence_number); 1204 1205 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { 1206 key->u.aes_gmac.replays++; 1207 return RX_DROP_UNUSABLE; 1208 } 1209 1210 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1211 /* hardware didn't decrypt/verify MIC */ 1212 bip_aad(skb, aad); 1213 1214 memcpy(nonce, hdr->addr2, ETH_ALEN); 1215 memcpy(nonce + ETH_ALEN, ipn, 6); 1216 1217 mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC); 1218 if (!mic) 1219 return RX_DROP_UNUSABLE; 1220 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, 1221 skb->data + 24, skb->len - 24, 1222 mic) < 0 || 1223 crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) { 1224 key->u.aes_gmac.icverrors++; 1225 kfree(mic); 1226 return RX_DROP_UNUSABLE; 1227 } 1228 kfree(mic); 1229 } 1230 1231 memcpy(key->u.aes_gmac.rx_pn, ipn, 6); 1232 1233 /* Remove MMIE */ 1234 skb_trim(skb, skb->len - sizeof(*mmie)); 1235 1236 return RX_CONTINUE; 1237 } 1238 1239 ieee80211_tx_result 1240 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) 1241 { 1242 struct sk_buff *skb; 1243 struct ieee80211_tx_info *info = NULL; 1244 ieee80211_tx_result res; 1245 1246 skb_queue_walk(&tx->skbs, skb) { 1247 info = IEEE80211_SKB_CB(skb); 1248 1249 /* handle hw-only algorithm */ 1250 if (!info->control.hw_key) 1251 return TX_DROP; 1252 1253 if (tx->key->flags & KEY_FLAG_CIPHER_SCHEME) { 1254 res = ieee80211_crypto_cs_encrypt(tx, skb); 1255 if (res != TX_CONTINUE) 1256 return res; 1257 } 1258 } 1259 1260 ieee80211_tx_set_protected(tx); 1261 1262 return TX_CONTINUE; 1263 } 1264 1265 ieee80211_rx_result 1266 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) 1267 { 1268 if (rx->sta && rx->sta->cipher_scheme) 1269 return ieee80211_crypto_cs_decrypt(rx); 1270 1271 return RX_DROP_UNUSABLE; 1272 } 1273