1 /* 2 * Copyright 2002-2004, Instant802 Networks, Inc. 3 * Copyright 2008, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/netdevice.h> 11 #include <linux/types.h> 12 #include <linux/skbuff.h> 13 #include <linux/compiler.h> 14 #include <linux/ieee80211.h> 15 #include <linux/gfp.h> 16 #include <asm/unaligned.h> 17 #include <net/mac80211.h> 18 #include <crypto/aes.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 tx->local->ops->set_frag_threshold) && 60 !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) { 61 /* hwaccel - with no need for SW-generated MMIC */ 62 return TX_CONTINUE; 63 } 64 65 tail = MICHAEL_MIC_LEN; 66 if (!info->control.hw_key) 67 tail += IEEE80211_TKIP_ICV_LEN; 68 69 if (WARN(skb_tailroom(skb) < tail || 70 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN, 71 "mmic: not enough head/tail (%d/%d,%d/%d)\n", 72 skb_headroom(skb), IEEE80211_TKIP_IV_LEN, 73 skb_tailroom(skb), tail)) 74 return TX_DROP; 75 76 key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY]; 77 mic = skb_put(skb, MICHAEL_MIC_LEN); 78 michael_mic(key, hdr, data, data_len, mic); 79 if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) 80 mic[0]++; 81 82 return TX_CONTINUE; 83 } 84 85 86 ieee80211_rx_result 87 ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx) 88 { 89 u8 *data, *key = NULL; 90 size_t data_len; 91 unsigned int hdrlen; 92 u8 mic[MICHAEL_MIC_LEN]; 93 struct sk_buff *skb = rx->skb; 94 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 95 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 96 97 /* 98 * it makes no sense to check for MIC errors on anything other 99 * than data frames. 100 */ 101 if (!ieee80211_is_data_present(hdr->frame_control)) 102 return RX_CONTINUE; 103 104 /* 105 * No way to verify the MIC if the hardware stripped it or 106 * the IV with the key index. In this case we have solely rely 107 * on the driver to set RX_FLAG_MMIC_ERROR in the event of a 108 * MIC failure report. 109 */ 110 if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) { 111 if (status->flag & RX_FLAG_MMIC_ERROR) 112 goto mic_fail_no_key; 113 114 if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key && 115 rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP) 116 goto update_iv; 117 118 return RX_CONTINUE; 119 } 120 121 /* 122 * Some hardware seems to generate Michael MIC failure reports; even 123 * though, the frame was not encrypted with TKIP and therefore has no 124 * MIC. Ignore the flag them to avoid triggering countermeasures. 125 */ 126 if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP || 127 !(status->flag & RX_FLAG_DECRYPTED)) 128 return RX_CONTINUE; 129 130 if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) { 131 /* 132 * APs with pairwise keys should never receive Michael MIC 133 * errors for non-zero keyidx because these are reserved for 134 * group keys and only the AP is sending real multicast 135 * frames in the BSS. 136 */ 137 return RX_DROP_UNUSABLE; 138 } 139 140 if (status->flag & RX_FLAG_MMIC_ERROR) 141 goto mic_fail; 142 143 hdrlen = ieee80211_hdrlen(hdr->frame_control); 144 if (skb->len < hdrlen + MICHAEL_MIC_LEN) 145 return RX_DROP_UNUSABLE; 146 147 if (skb_linearize(rx->skb)) 148 return RX_DROP_UNUSABLE; 149 hdr = (void *)skb->data; 150 151 data = skb->data + hdrlen; 152 data_len = skb->len - hdrlen - MICHAEL_MIC_LEN; 153 key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY]; 154 michael_mic(key, hdr, data, data_len, mic); 155 if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0) 156 goto mic_fail; 157 158 /* remove Michael MIC from payload */ 159 skb_trim(skb, skb->len - MICHAEL_MIC_LEN); 160 161 update_iv: 162 /* update IV in key information to be able to detect replays */ 163 rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32; 164 rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16; 165 166 return RX_CONTINUE; 167 168 mic_fail: 169 rx->key->u.tkip.mic_failures++; 170 171 mic_fail_no_key: 172 /* 173 * In some cases the key can be unset - e.g. a multicast packet, in 174 * a driver that supports HW encryption. Send up the key idx only if 175 * the key is set. 176 */ 177 mac80211_ev_michael_mic_failure(rx->sdata, 178 rx->key ? rx->key->conf.keyidx : -1, 179 (void *) skb->data, NULL, GFP_ATOMIC); 180 return RX_DROP_UNUSABLE; 181 } 182 183 184 static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 185 { 186 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 187 struct ieee80211_key *key = tx->key; 188 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 189 unsigned int hdrlen; 190 int len, tail; 191 u8 *pos; 192 193 if (info->control.hw_key && 194 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 195 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { 196 /* hwaccel - with no need for software-generated IV */ 197 return 0; 198 } 199 200 hdrlen = ieee80211_hdrlen(hdr->frame_control); 201 len = skb->len - hdrlen; 202 203 if (info->control.hw_key) 204 tail = 0; 205 else 206 tail = IEEE80211_TKIP_ICV_LEN; 207 208 if (WARN_ON(skb_tailroom(skb) < tail || 209 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN)) 210 return -1; 211 212 pos = skb_push(skb, IEEE80211_TKIP_IV_LEN); 213 memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen); 214 pos += hdrlen; 215 216 /* the HW only needs room for the IV, but not the actual IV */ 217 if (info->control.hw_key && 218 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 219 return 0; 220 221 /* Increase IV for the frame */ 222 spin_lock(&key->u.tkip.txlock); 223 key->u.tkip.tx.iv16++; 224 if (key->u.tkip.tx.iv16 == 0) 225 key->u.tkip.tx.iv32++; 226 pos = ieee80211_tkip_add_iv(pos, key); 227 spin_unlock(&key->u.tkip.txlock); 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->u.ccmp.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 data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len; 508 if (!rx->sta || data_len < 0) 509 return RX_DROP_UNUSABLE; 510 511 if (status->flag & RX_FLAG_DECRYPTED) { 512 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN)) 513 return RX_DROP_UNUSABLE; 514 } else { 515 if (skb_linearize(rx->skb)) 516 return RX_DROP_UNUSABLE; 517 } 518 519 ccmp_hdr2pn(pn, skb->data + hdrlen); 520 521 queue = rx->security_idx; 522 523 if (memcmp(pn, key->u.ccmp.rx_pn[queue], IEEE80211_CCMP_PN_LEN) <= 0) { 524 key->u.ccmp.replays++; 525 return RX_DROP_UNUSABLE; 526 } 527 528 if (!(status->flag & RX_FLAG_DECRYPTED)) { 529 u8 aad[2 * AES_BLOCK_SIZE]; 530 u8 b_0[AES_BLOCK_SIZE]; 531 /* hardware didn't decrypt/verify MIC */ 532 ccmp_special_blocks(skb, pn, b_0, aad); 533 534 if (ieee80211_aes_ccm_decrypt( 535 key->u.ccmp.tfm, b_0, aad, 536 skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN, 537 data_len, 538 skb->data + skb->len - mic_len, mic_len)) 539 return RX_DROP_UNUSABLE; 540 } 541 542 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN); 543 544 /* Remove CCMP header and MIC */ 545 if (pskb_trim(skb, skb->len - mic_len)) 546 return RX_DROP_UNUSABLE; 547 memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen); 548 skb_pull(skb, IEEE80211_CCMP_HDR_LEN); 549 550 return RX_CONTINUE; 551 } 552 553 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad) 554 { 555 __le16 mask_fc; 556 u8 qos_tid; 557 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 558 559 memcpy(j_0, hdr->addr2, ETH_ALEN); 560 memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN); 561 j_0[13] = 0; 562 j_0[14] = 0; 563 j_0[AES_BLOCK_SIZE - 1] = 0x01; 564 565 /* AAD (extra authenticate-only data) / masked 802.11 header 566 * FC | A1 | A2 | A3 | SC | [A4] | [QC] 567 */ 568 put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]); 569 /* Mask FC: zero subtype b4 b5 b6 (if not mgmt) 570 * Retry, PwrMgt, MoreData; set Protected 571 */ 572 mask_fc = hdr->frame_control; 573 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | 574 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA); 575 if (!ieee80211_is_mgmt(hdr->frame_control)) 576 mask_fc &= ~cpu_to_le16(0x0070); 577 mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); 578 579 put_unaligned(mask_fc, (__le16 *)&aad[2]); 580 memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN); 581 582 /* Mask Seq#, leave Frag# */ 583 aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f; 584 aad[23] = 0; 585 586 if (ieee80211_is_data_qos(hdr->frame_control)) 587 qos_tid = *ieee80211_get_qos_ctl(hdr) & 588 IEEE80211_QOS_CTL_TID_MASK; 589 else 590 qos_tid = 0; 591 592 if (ieee80211_has_a4(hdr->frame_control)) { 593 memcpy(&aad[24], hdr->addr4, ETH_ALEN); 594 aad[30] = qos_tid; 595 aad[31] = 0; 596 } else { 597 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN); 598 aad[24] = qos_tid; 599 } 600 } 601 602 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id) 603 { 604 hdr[0] = pn[5]; 605 hdr[1] = pn[4]; 606 hdr[2] = 0; 607 hdr[3] = 0x20 | (key_id << 6); 608 hdr[4] = pn[3]; 609 hdr[5] = pn[2]; 610 hdr[6] = pn[1]; 611 hdr[7] = pn[0]; 612 } 613 614 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr) 615 { 616 pn[0] = hdr[7]; 617 pn[1] = hdr[6]; 618 pn[2] = hdr[5]; 619 pn[3] = hdr[4]; 620 pn[4] = hdr[1]; 621 pn[5] = hdr[0]; 622 } 623 624 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb) 625 { 626 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 627 struct ieee80211_key *key = tx->key; 628 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 629 int hdrlen, len, tail; 630 u8 *pos; 631 u8 pn[6]; 632 u64 pn64; 633 u8 aad[2 * AES_BLOCK_SIZE]; 634 u8 j_0[AES_BLOCK_SIZE]; 635 636 if (info->control.hw_key && 637 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) && 638 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) && 639 !((info->control.hw_key->flags & 640 IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) && 641 ieee80211_is_mgmt(hdr->frame_control))) { 642 /* hwaccel has no need for preallocated room for GCMP 643 * header or MIC fields 644 */ 645 return 0; 646 } 647 648 hdrlen = ieee80211_hdrlen(hdr->frame_control); 649 len = skb->len - hdrlen; 650 651 if (info->control.hw_key) 652 tail = 0; 653 else 654 tail = IEEE80211_GCMP_MIC_LEN; 655 656 if (WARN_ON(skb_tailroom(skb) < tail || 657 skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN)) 658 return -1; 659 660 pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN); 661 memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen); 662 skb_set_network_header(skb, skb_network_offset(skb) + 663 IEEE80211_GCMP_HDR_LEN); 664 665 /* the HW only needs room for the IV, but not the actual IV */ 666 if (info->control.hw_key && 667 (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) 668 return 0; 669 670 hdr = (struct ieee80211_hdr *)pos; 671 pos += hdrlen; 672 673 pn64 = atomic64_inc_return(&key->u.gcmp.tx_pn); 674 675 pn[5] = pn64; 676 pn[4] = pn64 >> 8; 677 pn[3] = pn64 >> 16; 678 pn[2] = pn64 >> 24; 679 pn[1] = pn64 >> 32; 680 pn[0] = pn64 >> 40; 681 682 gcmp_pn2hdr(pos, pn, key->conf.keyidx); 683 684 /* hwaccel - with software GCMP header */ 685 if (info->control.hw_key) 686 return 0; 687 688 pos += IEEE80211_GCMP_HDR_LEN; 689 gcmp_special_blocks(skb, pn, j_0, aad); 690 ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len, 691 skb_put(skb, IEEE80211_GCMP_MIC_LEN)); 692 693 return 0; 694 } 695 696 ieee80211_tx_result 697 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx) 698 { 699 struct sk_buff *skb; 700 701 ieee80211_tx_set_protected(tx); 702 703 skb_queue_walk(&tx->skbs, skb) { 704 if (gcmp_encrypt_skb(tx, skb) < 0) 705 return TX_DROP; 706 } 707 708 return TX_CONTINUE; 709 } 710 711 ieee80211_rx_result 712 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx) 713 { 714 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 715 int hdrlen; 716 struct ieee80211_key *key = rx->key; 717 struct sk_buff *skb = rx->skb; 718 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 719 u8 pn[IEEE80211_GCMP_PN_LEN]; 720 int data_len; 721 int queue; 722 723 hdrlen = ieee80211_hdrlen(hdr->frame_control); 724 725 if (!ieee80211_is_data(hdr->frame_control) && 726 !ieee80211_is_robust_mgmt_frame(skb)) 727 return RX_CONTINUE; 728 729 data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - 730 IEEE80211_GCMP_MIC_LEN; 731 if (!rx->sta || data_len < 0) 732 return RX_DROP_UNUSABLE; 733 734 if (status->flag & RX_FLAG_DECRYPTED) { 735 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN)) 736 return RX_DROP_UNUSABLE; 737 } else { 738 if (skb_linearize(rx->skb)) 739 return RX_DROP_UNUSABLE; 740 } 741 742 gcmp_hdr2pn(pn, skb->data + hdrlen); 743 744 queue = rx->security_idx; 745 746 if (memcmp(pn, key->u.gcmp.rx_pn[queue], IEEE80211_GCMP_PN_LEN) <= 0) { 747 key->u.gcmp.replays++; 748 return RX_DROP_UNUSABLE; 749 } 750 751 if (!(status->flag & RX_FLAG_DECRYPTED)) { 752 u8 aad[2 * AES_BLOCK_SIZE]; 753 u8 j_0[AES_BLOCK_SIZE]; 754 /* hardware didn't decrypt/verify MIC */ 755 gcmp_special_blocks(skb, pn, j_0, aad); 756 757 if (ieee80211_aes_gcm_decrypt( 758 key->u.gcmp.tfm, j_0, aad, 759 skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN, 760 data_len, 761 skb->data + skb->len - IEEE80211_GCMP_MIC_LEN)) 762 return RX_DROP_UNUSABLE; 763 } 764 765 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN); 766 767 /* Remove GCMP header and MIC */ 768 if (pskb_trim(skb, skb->len - IEEE80211_GCMP_MIC_LEN)) 769 return RX_DROP_UNUSABLE; 770 memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen); 771 skb_pull(skb, IEEE80211_GCMP_HDR_LEN); 772 773 return RX_CONTINUE; 774 } 775 776 static ieee80211_tx_result 777 ieee80211_crypto_cs_encrypt(struct ieee80211_tx_data *tx, 778 struct sk_buff *skb) 779 { 780 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 781 struct ieee80211_key *key = tx->key; 782 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); 783 const struct ieee80211_cipher_scheme *cs = key->sta->cipher_scheme; 784 int hdrlen; 785 u8 *pos; 786 787 if (info->control.hw_key && 788 !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) { 789 /* hwaccel has no need for preallocated head room */ 790 return TX_CONTINUE; 791 } 792 793 if (unlikely(skb_headroom(skb) < cs->hdr_len && 794 pskb_expand_head(skb, cs->hdr_len, 0, GFP_ATOMIC))) 795 return TX_DROP; 796 797 hdrlen = ieee80211_hdrlen(hdr->frame_control); 798 799 pos = skb_push(skb, cs->hdr_len); 800 memmove(pos, pos + cs->hdr_len, hdrlen); 801 802 return TX_CONTINUE; 803 } 804 805 static inline int ieee80211_crypto_cs_pn_compare(u8 *pn1, u8 *pn2, int len) 806 { 807 int i; 808 809 /* pn is little endian */ 810 for (i = len - 1; i >= 0; i--) { 811 if (pn1[i] < pn2[i]) 812 return -1; 813 else if (pn1[i] > pn2[i]) 814 return 1; 815 } 816 817 return 0; 818 } 819 820 static ieee80211_rx_result 821 ieee80211_crypto_cs_decrypt(struct ieee80211_rx_data *rx) 822 { 823 struct ieee80211_key *key = rx->key; 824 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; 825 const struct ieee80211_cipher_scheme *cs = NULL; 826 int hdrlen = ieee80211_hdrlen(hdr->frame_control); 827 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); 828 int data_len; 829 u8 *rx_pn; 830 u8 *skb_pn; 831 u8 qos_tid; 832 833 if (!rx->sta || !rx->sta->cipher_scheme || 834 !(status->flag & RX_FLAG_DECRYPTED)) 835 return RX_DROP_UNUSABLE; 836 837 if (!ieee80211_is_data(hdr->frame_control)) 838 return RX_CONTINUE; 839 840 cs = rx->sta->cipher_scheme; 841 842 data_len = rx->skb->len - hdrlen - cs->hdr_len; 843 844 if (data_len < 0) 845 return RX_DROP_UNUSABLE; 846 847 if (ieee80211_is_data_qos(hdr->frame_control)) 848 qos_tid = *ieee80211_get_qos_ctl(hdr) & 849 IEEE80211_QOS_CTL_TID_MASK; 850 else 851 qos_tid = 0; 852 853 if (skb_linearize(rx->skb)) 854 return RX_DROP_UNUSABLE; 855 856 hdr = (struct ieee80211_hdr *)rx->skb->data; 857 858 rx_pn = key->u.gen.rx_pn[qos_tid]; 859 skb_pn = rx->skb->data + hdrlen + cs->pn_off; 860 861 if (ieee80211_crypto_cs_pn_compare(skb_pn, rx_pn, cs->pn_len) <= 0) 862 return RX_DROP_UNUSABLE; 863 864 memcpy(rx_pn, skb_pn, cs->pn_len); 865 866 /* remove security header and MIC */ 867 if (pskb_trim(rx->skb, rx->skb->len - cs->mic_len)) 868 return RX_DROP_UNUSABLE; 869 870 memmove(rx->skb->data + cs->hdr_len, rx->skb->data, hdrlen); 871 skb_pull(rx->skb, cs->hdr_len); 872 873 return RX_CONTINUE; 874 } 875 876 static void bip_aad(struct sk_buff *skb, u8 *aad) 877 { 878 __le16 mask_fc; 879 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 880 881 /* BIP AAD: FC(masked) || A1 || A2 || A3 */ 882 883 /* FC type/subtype */ 884 /* Mask FC Retry, PwrMgt, MoreData flags to zero */ 885 mask_fc = hdr->frame_control; 886 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM | 887 IEEE80211_FCTL_MOREDATA); 888 put_unaligned(mask_fc, (__le16 *) &aad[0]); 889 /* A1 || A2 || A3 */ 890 memcpy(aad + 2, &hdr->addr1, 3 * ETH_ALEN); 891 } 892 893 894 static inline void bip_ipn_set64(u8 *d, u64 pn) 895 { 896 *d++ = pn; 897 *d++ = pn >> 8; 898 *d++ = pn >> 16; 899 *d++ = pn >> 24; 900 *d++ = pn >> 32; 901 *d = pn >> 40; 902 } 903 904 static inline void bip_ipn_swap(u8 *d, const u8 *s) 905 { 906 *d++ = s[5]; 907 *d++ = s[4]; 908 *d++ = s[3]; 909 *d++ = s[2]; 910 *d++ = s[1]; 911 *d = s[0]; 912 } 913 914 915 ieee80211_tx_result 916 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx) 917 { 918 struct sk_buff *skb; 919 struct ieee80211_tx_info *info; 920 struct ieee80211_key *key = tx->key; 921 struct ieee80211_mmie *mmie; 922 u8 aad[20]; 923 u64 pn64; 924 925 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 926 return TX_DROP; 927 928 skb = skb_peek(&tx->skbs); 929 930 info = IEEE80211_SKB_CB(skb); 931 932 if (info->control.hw_key) 933 return TX_CONTINUE; 934 935 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 936 return TX_DROP; 937 938 mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie)); 939 mmie->element_id = WLAN_EID_MMIE; 940 mmie->length = sizeof(*mmie) - 2; 941 mmie->key_id = cpu_to_le16(key->conf.keyidx); 942 943 /* PN = PN + 1 */ 944 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); 945 946 bip_ipn_set64(mmie->sequence_number, pn64); 947 948 bip_aad(skb, aad); 949 950 /* 951 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) 952 */ 953 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 954 skb->data + 24, skb->len - 24, mmie->mic); 955 956 return TX_CONTINUE; 957 } 958 959 ieee80211_tx_result 960 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx) 961 { 962 struct sk_buff *skb; 963 struct ieee80211_tx_info *info; 964 struct ieee80211_key *key = tx->key; 965 struct ieee80211_mmie_16 *mmie; 966 u8 aad[20]; 967 u64 pn64; 968 969 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 970 return TX_DROP; 971 972 skb = skb_peek(&tx->skbs); 973 974 info = IEEE80211_SKB_CB(skb); 975 976 if (info->control.hw_key) 977 return TX_CONTINUE; 978 979 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 980 return TX_DROP; 981 982 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); 983 mmie->element_id = WLAN_EID_MMIE; 984 mmie->length = sizeof(*mmie) - 2; 985 mmie->key_id = cpu_to_le16(key->conf.keyidx); 986 987 /* PN = PN + 1 */ 988 pn64 = atomic64_inc_return(&key->u.aes_cmac.tx_pn); 989 990 bip_ipn_set64(mmie->sequence_number, pn64); 991 992 bip_aad(skb, aad); 993 994 /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128) 995 */ 996 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, 997 skb->data + 24, skb->len - 24, mmie->mic); 998 999 return TX_CONTINUE; 1000 } 1001 1002 ieee80211_rx_result 1003 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx) 1004 { 1005 struct sk_buff *skb = rx->skb; 1006 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1007 struct ieee80211_key *key = rx->key; 1008 struct ieee80211_mmie *mmie; 1009 u8 aad[20], mic[8], ipn[6]; 1010 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; 1011 1012 if (!ieee80211_is_mgmt(hdr->frame_control)) 1013 return RX_CONTINUE; 1014 1015 /* management frames are already linear */ 1016 1017 if (skb->len < 24 + sizeof(*mmie)) 1018 return RX_DROP_UNUSABLE; 1019 1020 mmie = (struct ieee80211_mmie *) 1021 (skb->data + skb->len - sizeof(*mmie)); 1022 if (mmie->element_id != WLAN_EID_MMIE || 1023 mmie->length != sizeof(*mmie) - 2) 1024 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1025 1026 bip_ipn_swap(ipn, mmie->sequence_number); 1027 1028 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { 1029 key->u.aes_cmac.replays++; 1030 return RX_DROP_UNUSABLE; 1031 } 1032 1033 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1034 /* hardware didn't decrypt/verify MIC */ 1035 bip_aad(skb, aad); 1036 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad, 1037 skb->data + 24, skb->len - 24, mic); 1038 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { 1039 key->u.aes_cmac.icverrors++; 1040 return RX_DROP_UNUSABLE; 1041 } 1042 } 1043 1044 memcpy(key->u.aes_cmac.rx_pn, ipn, 6); 1045 1046 /* Remove MMIE */ 1047 skb_trim(skb, skb->len - sizeof(*mmie)); 1048 1049 return RX_CONTINUE; 1050 } 1051 1052 ieee80211_rx_result 1053 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx) 1054 { 1055 struct sk_buff *skb = rx->skb; 1056 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1057 struct ieee80211_key *key = rx->key; 1058 struct ieee80211_mmie_16 *mmie; 1059 u8 aad[20], mic[16], ipn[6]; 1060 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1061 1062 if (!ieee80211_is_mgmt(hdr->frame_control)) 1063 return RX_CONTINUE; 1064 1065 /* management frames are already linear */ 1066 1067 if (skb->len < 24 + sizeof(*mmie)) 1068 return RX_DROP_UNUSABLE; 1069 1070 mmie = (struct ieee80211_mmie_16 *) 1071 (skb->data + skb->len - sizeof(*mmie)); 1072 if (mmie->element_id != WLAN_EID_MMIE || 1073 mmie->length != sizeof(*mmie) - 2) 1074 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1075 1076 bip_ipn_swap(ipn, mmie->sequence_number); 1077 1078 if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) { 1079 key->u.aes_cmac.replays++; 1080 return RX_DROP_UNUSABLE; 1081 } 1082 1083 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1084 /* hardware didn't decrypt/verify MIC */ 1085 bip_aad(skb, aad); 1086 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad, 1087 skb->data + 24, skb->len - 24, mic); 1088 if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { 1089 key->u.aes_cmac.icverrors++; 1090 return RX_DROP_UNUSABLE; 1091 } 1092 } 1093 1094 memcpy(key->u.aes_cmac.rx_pn, ipn, 6); 1095 1096 /* Remove MMIE */ 1097 skb_trim(skb, skb->len - sizeof(*mmie)); 1098 1099 return RX_CONTINUE; 1100 } 1101 1102 ieee80211_tx_result 1103 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx) 1104 { 1105 struct sk_buff *skb; 1106 struct ieee80211_tx_info *info; 1107 struct ieee80211_key *key = tx->key; 1108 struct ieee80211_mmie_16 *mmie; 1109 struct ieee80211_hdr *hdr; 1110 u8 aad[20]; 1111 u64 pn64; 1112 u8 nonce[12]; 1113 1114 if (WARN_ON(skb_queue_len(&tx->skbs) != 1)) 1115 return TX_DROP; 1116 1117 skb = skb_peek(&tx->skbs); 1118 1119 info = IEEE80211_SKB_CB(skb); 1120 1121 if (info->control.hw_key) 1122 return TX_CONTINUE; 1123 1124 if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie))) 1125 return TX_DROP; 1126 1127 mmie = (struct ieee80211_mmie_16 *)skb_put(skb, sizeof(*mmie)); 1128 mmie->element_id = WLAN_EID_MMIE; 1129 mmie->length = sizeof(*mmie) - 2; 1130 mmie->key_id = cpu_to_le16(key->conf.keyidx); 1131 1132 /* PN = PN + 1 */ 1133 pn64 = atomic64_inc_return(&key->u.aes_gmac.tx_pn); 1134 1135 bip_ipn_set64(mmie->sequence_number, pn64); 1136 1137 bip_aad(skb, aad); 1138 1139 hdr = (struct ieee80211_hdr *)skb->data; 1140 memcpy(nonce, hdr->addr2, ETH_ALEN); 1141 bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number); 1142 1143 /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */ 1144 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, 1145 skb->data + 24, skb->len - 24, mmie->mic) < 0) 1146 return TX_DROP; 1147 1148 return TX_CONTINUE; 1149 } 1150 1151 ieee80211_rx_result 1152 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx) 1153 { 1154 struct sk_buff *skb = rx->skb; 1155 struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); 1156 struct ieee80211_key *key = rx->key; 1157 struct ieee80211_mmie_16 *mmie; 1158 u8 aad[20], mic[16], ipn[6], nonce[12]; 1159 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; 1160 1161 if (!ieee80211_is_mgmt(hdr->frame_control)) 1162 return RX_CONTINUE; 1163 1164 /* management frames are already linear */ 1165 1166 if (skb->len < 24 + sizeof(*mmie)) 1167 return RX_DROP_UNUSABLE; 1168 1169 mmie = (struct ieee80211_mmie_16 *) 1170 (skb->data + skb->len - sizeof(*mmie)); 1171 if (mmie->element_id != WLAN_EID_MMIE || 1172 mmie->length != sizeof(*mmie) - 2) 1173 return RX_DROP_UNUSABLE; /* Invalid MMIE */ 1174 1175 bip_ipn_swap(ipn, mmie->sequence_number); 1176 1177 if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) { 1178 key->u.aes_gmac.replays++; 1179 return RX_DROP_UNUSABLE; 1180 } 1181 1182 if (!(status->flag & RX_FLAG_DECRYPTED)) { 1183 /* hardware didn't decrypt/verify MIC */ 1184 bip_aad(skb, aad); 1185 1186 memcpy(nonce, hdr->addr2, ETH_ALEN); 1187 memcpy(nonce + ETH_ALEN, ipn, 6); 1188 1189 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce, 1190 skb->data + 24, skb->len - 24, 1191 mic) < 0 || 1192 memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) { 1193 key->u.aes_gmac.icverrors++; 1194 return RX_DROP_UNUSABLE; 1195 } 1196 } 1197 1198 memcpy(key->u.aes_gmac.rx_pn, ipn, 6); 1199 1200 /* Remove MMIE */ 1201 skb_trim(skb, skb->len - sizeof(*mmie)); 1202 1203 return RX_CONTINUE; 1204 } 1205 1206 ieee80211_tx_result 1207 ieee80211_crypto_hw_encrypt(struct ieee80211_tx_data *tx) 1208 { 1209 struct sk_buff *skb; 1210 struct ieee80211_tx_info *info = NULL; 1211 ieee80211_tx_result res; 1212 1213 skb_queue_walk(&tx->skbs, skb) { 1214 info = IEEE80211_SKB_CB(skb); 1215 1216 /* handle hw-only algorithm */ 1217 if (!info->control.hw_key) 1218 return TX_DROP; 1219 1220 if (tx->key->sta->cipher_scheme) { 1221 res = ieee80211_crypto_cs_encrypt(tx, skb); 1222 if (res != TX_CONTINUE) 1223 return res; 1224 } 1225 } 1226 1227 ieee80211_tx_set_protected(tx); 1228 1229 return TX_CONTINUE; 1230 } 1231 1232 ieee80211_rx_result 1233 ieee80211_crypto_hw_decrypt(struct ieee80211_rx_data *rx) 1234 { 1235 if (rx->sta && rx->sta->cipher_scheme) 1236 return ieee80211_crypto_cs_decrypt(rx); 1237 1238 return RX_DROP_UNUSABLE; 1239 } 1240