net/mac80211/wpa.c

   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) 2020-2023 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 <linux/unaligned.h>
  16 #include <net/mac80211.h>
  17 #include <crypto/aes.h>
  18 #include <crypto/utils.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_U_AP_RX_GROUPCAST;
 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_U_SHORT_MMIC;
 154
 155         if (skb_linearize(rx->skb))
 156                 return RX_DROP_U_OOM;
 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_U_MMIC_FAIL;
 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_U_SHORT_TKIP;
 280
 281         /* it may be possible to optimize this a bit more */
 282         if (skb_linearize(rx->skb))
 283                 return RX_DROP_U_OOM;
 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_U_TKIP_FAIL;
 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  * Calculate AAD for CCMP/GCMP, returning qos_tid since we
 316  * need that in CCMP also for b_0.
 317  */
 318 static u8 ccmp_gcmp_aad(struct sk_buff *skb, u8 *aad, bool spp_amsdu)
 319 {
 320         struct ieee80211_hdr *hdr = (void *)skb->data;
 321         __le16 mask_fc;
 322         int a4_included, mgmt;
 323         u8 qos_tid;
 324         u16 len_a = 22;
 325
 326         /*
 327          * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
 328          * Retry, PwrMgt, MoreData, Order (if Qos Data); set Protected
 329          */
 330         mgmt = ieee80211_is_mgmt(hdr->frame_control);
 331         mask_fc = hdr->frame_control;
 332         mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
 333                                 IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
 334         if (!mgmt)
 335                 mask_fc &= ~cpu_to_le16(0x0070);
 336         mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 337
 338         a4_included = ieee80211_has_a4(hdr->frame_control);
 339         if (a4_included)
 340                 len_a += 6;
 341
 342         if (ieee80211_is_data_qos(hdr->frame_control)) {
 343                 qos_tid = *ieee80211_get_qos_ctl(hdr);
 344
 345                 if (spp_amsdu)
 346                         qos_tid &= IEEE80211_QOS_CTL_TID_MASK |
 347                                    IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 348                 else
 349                         qos_tid &= IEEE80211_QOS_CTL_TID_MASK;
 350
 351                 mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_ORDER);
 352                 len_a += 2;
 353         } else {
 354                 qos_tid = 0;
 355         }
 356
 357         /* AAD (extra authenticate-only data) / masked 802.11 header
 358          * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
 359         put_unaligned_be16(len_a, &aad[0]);
 360         put_unaligned(mask_fc, (__le16 *)&aad[2]);
 361         memcpy(&aad[4], &hdr->addrs, 3 * ETH_ALEN);
 362
 363         /* Mask Seq#, leave Frag# */
 364         aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
 365         aad[23] = 0;
 366
 367         if (a4_included) {
 368                 memcpy(&aad[24], hdr->addr4, ETH_ALEN);
 369                 aad[30] = qos_tid;
 370                 aad[31] = 0;
 371         } else {
 372                 memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
 373                 aad[24] = qos_tid;
 374         }
 375
 376         return qos_tid;
 377 }
 378
 379 static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
 380                                 bool spp_amsdu)
 381 {
 382         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 383         u8 qos_tid = ccmp_gcmp_aad(skb, aad, spp_amsdu);
 384
 385         /* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
 386          * mode authentication are not allowed to collide, yet both are derived
 387          * from this vector b_0. We only set L := 1 here to indicate that the
 388          * data size can be represented in (L+1) bytes. The CCM layer will take
 389          * care of storing the data length in the top (L+1) bytes and setting
 390          * and clearing the other bits as is required to derive the two IVs.
 391          */
 392         b_0[0] = 0x1;
 393
 394         /* Nonce: Nonce Flags | A2 | PN
 395          * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
 396          */
 397         b_0[1] = qos_tid | (ieee80211_is_mgmt(hdr->frame_control) << 4);
 398         memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
 399         memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);
 400 }
 401
 402 static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
 403 {
 404         hdr[0] = pn[5];
 405         hdr[1] = pn[4];
 406         hdr[2] = 0;
 407         hdr[3] = 0x20 | (key_id << 6);
 408         hdr[4] = pn[3];
 409         hdr[5] = pn[2];
 410         hdr[6] = pn[1];
 411         hdr[7] = pn[0];
 412 }
 413
 414
 415 static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
 416 {
 417         pn[0] = hdr[7];
 418         pn[1] = hdr[6];
 419         pn[2] = hdr[5];
 420         pn[3] = hdr[4];
 421         pn[4] = hdr[1];
 422         pn[5] = hdr[0];
 423 }
 424
 425
 426 static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
 427                             unsigned int mic_len)
 428 {
 429         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 430         struct ieee80211_key *key = tx->key;
 431         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 432         int hdrlen, len, tail;
 433         u8 *pos;
 434         u8 pn[6];
 435         u64 pn64;
 436         u8 aad[CCM_AAD_LEN];
 437         u8 b_0[AES_BLOCK_SIZE];
 438
 439         if (info->control.hw_key &&
 440             !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
 441             !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 442             !((info->control.hw_key->flags &
 443                IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
 444               ieee80211_is_mgmt(hdr->frame_control))) {
 445                 /*
 446                  * hwaccel has no need for preallocated room for CCMP
 447                  * header or MIC fields
 448                  */
 449                 return 0;
 450         }
 451
 452         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 453         len = skb->len - hdrlen;
 454
 455         if (info->control.hw_key)
 456                 tail = 0;
 457         else
 458                 tail = mic_len;
 459
 460         if (WARN_ON(skb_tailroom(skb) < tail ||
 461                     skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
 462                 return -1;
 463
 464         pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
 465         memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);
 466
 467         /* the HW only needs room for the IV, but not the actual IV */
 468         if (info->control.hw_key &&
 469             (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
 470                 return 0;
 471
 472         pos += hdrlen;
 473
 474         pn64 = atomic64_inc_return(&key->conf.tx_pn);
 475
 476         pn[5] = pn64;
 477         pn[4] = pn64 >> 8;
 478         pn[3] = pn64 >> 16;
 479         pn[2] = pn64 >> 24;
 480         pn[1] = pn64 >> 32;
 481         pn[0] = pn64 >> 40;
 482
 483         ccmp_pn2hdr(pos, pn, key->conf.keyidx);
 484
 485         /* hwaccel - with software CCMP header */
 486         if (info->control.hw_key)
 487                 return 0;
 488
 489         pos += IEEE80211_CCMP_HDR_LEN;
 490         ccmp_special_blocks(skb, pn, b_0, aad,
 491                             key->conf.flags & IEEE80211_KEY_FLAG_SPP_AMSDU);
 492         return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
 493                                          skb_put(skb, mic_len));
 494 }
 495
 496
 497 ieee80211_tx_result
 498 ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
 499                               unsigned int mic_len)
 500 {
 501         struct sk_buff *skb;
 502
 503         ieee80211_tx_set_protected(tx);
 504
 505         skb_queue_walk(&tx->skbs, skb) {
 506                 if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
 507                         return TX_DROP;
 508         }
 509
 510         return TX_CONTINUE;
 511 }
 512
 513
 514 ieee80211_rx_result
 515 ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
 516                               unsigned int mic_len)
 517 {
 518         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 519         int hdrlen;
 520         struct ieee80211_key *key = rx->key;
 521         struct sk_buff *skb = rx->skb;
 522         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 523         u8 pn[IEEE80211_CCMP_PN_LEN];
 524         int data_len;
 525         int queue;
 526
 527         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 528
 529         if (!ieee80211_is_data(hdr->frame_control) &&
 530             !ieee80211_is_robust_mgmt_frame(skb))
 531                 return RX_CONTINUE;
 532
 533         if (status->flag & RX_FLAG_DECRYPTED) {
 534                 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
 535                         return RX_DROP_U_SHORT_CCMP;
 536                 if (status->flag & RX_FLAG_MIC_STRIPPED)
 537                         mic_len = 0;
 538         } else {
 539                 if (skb_linearize(rx->skb))
 540                         return RX_DROP_U_OOM;
 541         }
 542
 543         /* reload hdr - skb might have been reallocated */
 544         hdr = (void *)rx->skb->data;
 545
 546         data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
 547         if (!rx->sta || data_len < 0)
 548                 return RX_DROP_U_SHORT_CCMP;
 549
 550         if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
 551                 int res;
 552
 553                 ccmp_hdr2pn(pn, skb->data + hdrlen);
 554
 555                 queue = rx->security_idx;
 556
 557                 res = memcmp(pn, key->u.ccmp.rx_pn[queue],
 558                              IEEE80211_CCMP_PN_LEN);
 559                 if (res < 0 ||
 560                     (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
 561                         key->u.ccmp.replays++;
 562                         return RX_DROP_U_REPLAY;
 563                 }
 564
 565                 if (!(status->flag & RX_FLAG_DECRYPTED)) {
 566                         u8 aad[2 * AES_BLOCK_SIZE];
 567                         u8 b_0[AES_BLOCK_SIZE];
 568                         /* hardware didn't decrypt/verify MIC */
 569                         ccmp_special_blocks(skb, pn, b_0, aad,
 570                                             key->conf.flags & IEEE80211_KEY_FLAG_SPP_AMSDU);
 571
 572                         if (ieee80211_aes_ccm_decrypt(
 573                                     key->u.ccmp.tfm, b_0, aad,
 574                                     skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
 575                                     data_len,
 576                                     skb->data + skb->len - mic_len))
 577                                 return RX_DROP_U_MIC_FAIL;
 578                 }
 579
 580                 memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
 581                 if (unlikely(ieee80211_is_frag(hdr)))
 582                         memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
 583         }
 584
 585         /* Remove CCMP header and MIC */
 586         if (pskb_trim(skb, skb->len - mic_len))
 587                 return RX_DROP_U_SHORT_CCMP_MIC;
 588         memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
 589         skb_pull(skb, IEEE80211_CCMP_HDR_LEN);
 590
 591         return RX_CONTINUE;
 592 }
 593
 594 static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad,
 595                                 bool spp_amsdu)
 596 {
 597         struct ieee80211_hdr *hdr = (void *)skb->data;
 598
 599         memcpy(j_0, hdr->addr2, ETH_ALEN);
 600         memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
 601         j_0[13] = 0;
 602         j_0[14] = 0;
 603         j_0[AES_BLOCK_SIZE - 1] = 0x01;
 604
 605         ccmp_gcmp_aad(skb, aad, spp_amsdu);
 606 }
 607
 608 static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
 609 {
 610         hdr[0] = pn[5];
 611         hdr[1] = pn[4];
 612         hdr[2] = 0;
 613         hdr[3] = 0x20 | (key_id << 6);
 614         hdr[4] = pn[3];
 615         hdr[5] = pn[2];
 616         hdr[6] = pn[1];
 617         hdr[7] = pn[0];
 618 }
 619
 620 static inline void gcmp_hdr2pn(u8 *pn, const u8 *hdr)
 621 {
 622         pn[0] = hdr[7];
 623         pn[1] = hdr[6];
 624         pn[2] = hdr[5];
 625         pn[3] = hdr[4];
 626         pn[4] = hdr[1];
 627         pn[5] = hdr[0];
 628 }
 629
 630 static int gcmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 631 {
 632         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 633         struct ieee80211_key *key = tx->key;
 634         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 635         int hdrlen, len, tail;
 636         u8 *pos;
 637         u8 pn[6];
 638         u64 pn64;
 639         u8 aad[GCM_AAD_LEN];
 640         u8 j_0[AES_BLOCK_SIZE];
 641
 642         if (info->control.hw_key &&
 643             !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
 644             !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
 645             !((info->control.hw_key->flags &
 646                IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
 647               ieee80211_is_mgmt(hdr->frame_control))) {
 648                 /* hwaccel has no need for preallocated room for GCMP
 649                  * header or MIC fields
 650                  */
 651                 return 0;
 652         }
 653
 654         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 655         len = skb->len - hdrlen;
 656
 657         if (info->control.hw_key)
 658                 tail = 0;
 659         else
 660                 tail = IEEE80211_GCMP_MIC_LEN;
 661
 662         if (WARN_ON(skb_tailroom(skb) < tail ||
 663                     skb_headroom(skb) < IEEE80211_GCMP_HDR_LEN))
 664                 return -1;
 665
 666         pos = skb_push(skb, IEEE80211_GCMP_HDR_LEN);
 667         memmove(pos, pos + IEEE80211_GCMP_HDR_LEN, hdrlen);
 668         skb_set_network_header(skb, skb_network_offset(skb) +
 669                                     IEEE80211_GCMP_HDR_LEN);
 670
 671         /* the HW only needs room for the IV, but not the actual IV */
 672         if (info->control.hw_key &&
 673             (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
 674                 return 0;
 675
 676         pos += hdrlen;
 677
 678         pn64 = atomic64_inc_return(&key->conf.tx_pn);
 679
 680         pn[5] = pn64;
 681         pn[4] = pn64 >> 8;
 682         pn[3] = pn64 >> 16;
 683         pn[2] = pn64 >> 24;
 684         pn[1] = pn64 >> 32;
 685         pn[0] = pn64 >> 40;
 686
 687         gcmp_pn2hdr(pos, pn, key->conf.keyidx);
 688
 689         /* hwaccel - with software GCMP header */
 690         if (info->control.hw_key)
 691                 return 0;
 692
 693         pos += IEEE80211_GCMP_HDR_LEN;
 694         gcmp_special_blocks(skb, pn, j_0, aad,
 695                             key->conf.flags & IEEE80211_KEY_FLAG_SPP_AMSDU);
 696         return ieee80211_aes_gcm_encrypt(key->u.gcmp.tfm, j_0, aad, pos, len,
 697                                          skb_put(skb, IEEE80211_GCMP_MIC_LEN));
 698 }
 699
 700 ieee80211_tx_result
 701 ieee80211_crypto_gcmp_encrypt(struct ieee80211_tx_data *tx)
 702 {
 703         struct sk_buff *skb;
 704
 705         ieee80211_tx_set_protected(tx);
 706
 707         skb_queue_walk(&tx->skbs, skb) {
 708                 if (gcmp_encrypt_skb(tx, skb) < 0)
 709                         return TX_DROP;
 710         }
 711
 712         return TX_CONTINUE;
 713 }
 714
 715 ieee80211_rx_result
 716 ieee80211_crypto_gcmp_decrypt(struct ieee80211_rx_data *rx)
 717 {
 718         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
 719         int hdrlen;
 720         struct ieee80211_key *key = rx->key;
 721         struct sk_buff *skb = rx->skb;
 722         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 723         u8 pn[IEEE80211_GCMP_PN_LEN];
 724         int data_len, queue, mic_len = IEEE80211_GCMP_MIC_LEN;
 725
 726         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 727
 728         if (!ieee80211_is_data(hdr->frame_control) &&
 729             !ieee80211_is_robust_mgmt_frame(skb))
 730                 return RX_CONTINUE;
 731
 732         if (status->flag & RX_FLAG_DECRYPTED) {
 733                 if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_GCMP_HDR_LEN))
 734                         return RX_DROP_U_SHORT_GCMP;
 735                 if (status->flag & RX_FLAG_MIC_STRIPPED)
 736                         mic_len = 0;
 737         } else {
 738                 if (skb_linearize(rx->skb))
 739                         return RX_DROP_U_OOM;
 740         }
 741
 742         /* reload hdr - skb might have been reallocated */
 743         hdr = (void *)rx->skb->data;
 744
 745         data_len = skb->len - hdrlen - IEEE80211_GCMP_HDR_LEN - mic_len;
 746         if (!rx->sta || data_len < 0)
 747                 return RX_DROP_U_SHORT_GCMP;
 748
 749         if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
 750                 int res;
 751
 752                 gcmp_hdr2pn(pn, skb->data + hdrlen);
 753
 754                 queue = rx->security_idx;
 755
 756                 res = memcmp(pn, key->u.gcmp.rx_pn[queue],
 757                              IEEE80211_GCMP_PN_LEN);
 758                 if (res < 0 ||
 759                     (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
 760                         key->u.gcmp.replays++;
 761                         return RX_DROP_U_REPLAY;
 762                 }
 763
 764                 if (!(status->flag & RX_FLAG_DECRYPTED)) {
 765                         u8 aad[2 * AES_BLOCK_SIZE];
 766                         u8 j_0[AES_BLOCK_SIZE];
 767                         /* hardware didn't decrypt/verify MIC */
 768                         gcmp_special_blocks(skb, pn, j_0, aad,
 769                                             key->conf.flags & IEEE80211_KEY_FLAG_SPP_AMSDU);
 770
 771                         if (ieee80211_aes_gcm_decrypt(
 772                                     key->u.gcmp.tfm, j_0, aad,
 773                                     skb->data + hdrlen + IEEE80211_GCMP_HDR_LEN,
 774                                     data_len,
 775                                     skb->data + skb->len -
 776                                     IEEE80211_GCMP_MIC_LEN))
 777                                 return RX_DROP_U_MIC_FAIL;
 778                 }
 779
 780                 memcpy(key->u.gcmp.rx_pn[queue], pn, IEEE80211_GCMP_PN_LEN);
 781                 if (unlikely(ieee80211_is_frag(hdr)))
 782                         memcpy(rx->ccm_gcm.pn, pn, IEEE80211_CCMP_PN_LEN);
 783         }
 784
 785         /* Remove GCMP header and MIC */
 786         if (pskb_trim(skb, skb->len - mic_len))
 787                 return RX_DROP_U_SHORT_GCMP_MIC;
 788         memmove(skb->data + IEEE80211_GCMP_HDR_LEN, skb->data, hdrlen);
 789         skb_pull(skb, IEEE80211_GCMP_HDR_LEN);
 790
 791         return RX_CONTINUE;
 792 }
 793
 794 static void bip_aad(struct sk_buff *skb, u8 *aad)
 795 {
 796         __le16 mask_fc;
 797         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 798
 799         /* BIP AAD: FC(masked) || A1 || A2 || A3 */
 800
 801         /* FC type/subtype */
 802         /* Mask FC Retry, PwrMgt, MoreData flags to zero */
 803         mask_fc = hdr->frame_control;
 804         mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY | IEEE80211_FCTL_PM |
 805                                 IEEE80211_FCTL_MOREDATA);
 806         put_unaligned(mask_fc, (__le16 *) &aad[0]);
 807         /* A1 || A2 || A3 */
 808         memcpy(aad + 2, &hdr->addrs, 3 * ETH_ALEN);
 809 }
 810
 811
 812 static inline void bip_ipn_set64(u8 *d, u64 pn)
 813 {
 814         *d++ = pn;
 815         *d++ = pn >> 8;
 816         *d++ = pn >> 16;
 817         *d++ = pn >> 24;
 818         *d++ = pn >> 32;
 819         *d = pn >> 40;
 820 }
 821
 822 static inline void bip_ipn_swap(u8 *d, const u8 *s)
 823 {
 824         *d++ = s[5];
 825         *d++ = s[4];
 826         *d++ = s[3];
 827         *d++ = s[2];
 828         *d++ = s[1];
 829         *d = s[0];
 830 }
 831
 832
 833 ieee80211_tx_result
 834 ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
 835 {
 836         struct sk_buff *skb;
 837         struct ieee80211_tx_info *info;
 838         struct ieee80211_key *key = tx->key;
 839         struct ieee80211_mmie *mmie;
 840         u8 aad[20];
 841         u64 pn64;
 842
 843         if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
 844                 return TX_DROP;
 845
 846         skb = skb_peek(&tx->skbs);
 847
 848         info = IEEE80211_SKB_CB(skb);
 849
 850         if (info->control.hw_key &&
 851             !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
 852                 return TX_CONTINUE;
 853
 854         if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
 855                 return TX_DROP;
 856
 857         mmie = skb_put(skb, sizeof(*mmie));
 858         mmie->element_id = WLAN_EID_MMIE;
 859         mmie->length = sizeof(*mmie) - 2;
 860         mmie->key_id = cpu_to_le16(key->conf.keyidx);
 861
 862         /* PN = PN + 1 */
 863         pn64 = atomic64_inc_return(&key->conf.tx_pn);
 864
 865         bip_ipn_set64(mmie->sequence_number, pn64);
 866
 867         if (info->control.hw_key)
 868                 return TX_CONTINUE;
 869
 870         bip_aad(skb, aad);
 871
 872         /*
 873          * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
 874          */
 875         ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
 876                            skb->data + 24, skb->len - 24, mmie->mic);
 877
 878         return TX_CONTINUE;
 879 }
 880
 881 ieee80211_tx_result
 882 ieee80211_crypto_aes_cmac_256_encrypt(struct ieee80211_tx_data *tx)
 883 {
 884         struct sk_buff *skb;
 885         struct ieee80211_tx_info *info;
 886         struct ieee80211_key *key = tx->key;
 887         struct ieee80211_mmie_16 *mmie;
 888         u8 aad[20];
 889         u64 pn64;
 890
 891         if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
 892                 return TX_DROP;
 893
 894         skb = skb_peek(&tx->skbs);
 895
 896         info = IEEE80211_SKB_CB(skb);
 897
 898         if (info->control.hw_key &&
 899             !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
 900                 return TX_CONTINUE;
 901
 902         if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
 903                 return TX_DROP;
 904
 905         mmie = skb_put(skb, sizeof(*mmie));
 906         mmie->element_id = WLAN_EID_MMIE;
 907         mmie->length = sizeof(*mmie) - 2;
 908         mmie->key_id = cpu_to_le16(key->conf.keyidx);
 909
 910         /* PN = PN + 1 */
 911         pn64 = atomic64_inc_return(&key->conf.tx_pn);
 912
 913         bip_ipn_set64(mmie->sequence_number, pn64);
 914
 915         if (info->control.hw_key)
 916                 return TX_CONTINUE;
 917
 918         bip_aad(skb, aad);
 919
 920         /* MIC = AES-256-CMAC(IGTK, AAD || Management Frame Body || MMIE, 128)
 921          */
 922         ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
 923                                skb->data + 24, skb->len - 24, mmie->mic);
 924
 925         return TX_CONTINUE;
 926 }
 927
 928 ieee80211_rx_result
 929 ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
 930 {
 931         struct sk_buff *skb = rx->skb;
 932         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 933         struct ieee80211_key *key = rx->key;
 934         struct ieee80211_mmie *mmie;
 935         u8 aad[20], mic[8], ipn[6];
 936         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 937
 938         if (!ieee80211_is_mgmt(hdr->frame_control))
 939                 return RX_CONTINUE;
 940
 941         /* management frames are already linear */
 942
 943         if (skb->len < 24 + sizeof(*mmie))
 944                 return RX_DROP_U_SHORT_CMAC;
 945
 946         mmie = (struct ieee80211_mmie *)
 947                 (skb->data + skb->len - sizeof(*mmie));
 948         if (mmie->element_id != WLAN_EID_MMIE ||
 949             mmie->length != sizeof(*mmie) - 2)
 950                 return RX_DROP_U_BAD_MMIE; /* Invalid MMIE */
 951
 952         bip_ipn_swap(ipn, mmie->sequence_number);
 953
 954         if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
 955                 key->u.aes_cmac.replays++;
 956                 return RX_DROP_U_REPLAY;
 957         }
 958
 959         if (!(status->flag & RX_FLAG_DECRYPTED)) {
 960                 /* hardware didn't decrypt/verify MIC */
 961                 bip_aad(skb, aad);
 962                 ieee80211_aes_cmac(key->u.aes_cmac.tfm, aad,
 963                                    skb->data + 24, skb->len - 24, mic);
 964                 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
 965                         key->u.aes_cmac.icverrors++;
 966                         return RX_DROP_U_MIC_FAIL;
 967                 }
 968         }
 969
 970         memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
 971
 972         /* Remove MMIE */
 973         skb_trim(skb, skb->len - sizeof(*mmie));
 974
 975         return RX_CONTINUE;
 976 }
 977
 978 ieee80211_rx_result
 979 ieee80211_crypto_aes_cmac_256_decrypt(struct ieee80211_rx_data *rx)
 980 {
 981         struct sk_buff *skb = rx->skb;
 982         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 983         struct ieee80211_key *key = rx->key;
 984         struct ieee80211_mmie_16 *mmie;
 985         u8 aad[20], mic[16], ipn[6];
 986         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 987
 988         if (!ieee80211_is_mgmt(hdr->frame_control))
 989                 return RX_CONTINUE;
 990
 991         /* management frames are already linear */
 992
 993         if (skb->len < 24 + sizeof(*mmie))
 994                 return RX_DROP_U_SHORT_CMAC256;
 995
 996         mmie = (struct ieee80211_mmie_16 *)
 997                 (skb->data + skb->len - sizeof(*mmie));
 998         if (mmie->element_id != WLAN_EID_MMIE ||
 999             mmie->length != sizeof(*mmie) - 2)
1000                 return RX_DROP_U_BAD_MMIE; /* Invalid MMIE */
1001
1002         bip_ipn_swap(ipn, mmie->sequence_number);
1003
1004         if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
1005                 key->u.aes_cmac.replays++;
1006                 return RX_DROP_U_REPLAY;
1007         }
1008
1009         if (!(status->flag & RX_FLAG_DECRYPTED)) {
1010                 /* hardware didn't decrypt/verify MIC */
1011                 bip_aad(skb, aad);
1012                 ieee80211_aes_cmac_256(key->u.aes_cmac.tfm, aad,
1013                                        skb->data + 24, skb->len - 24, mic);
1014                 if (crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1015                         key->u.aes_cmac.icverrors++;
1016                         return RX_DROP_U_MIC_FAIL;
1017                 }
1018         }
1019
1020         memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
1021
1022         /* Remove MMIE */
1023         skb_trim(skb, skb->len - sizeof(*mmie));
1024
1025         return RX_CONTINUE;
1026 }
1027
1028 ieee80211_tx_result
1029 ieee80211_crypto_aes_gmac_encrypt(struct ieee80211_tx_data *tx)
1030 {
1031         struct sk_buff *skb;
1032         struct ieee80211_tx_info *info;
1033         struct ieee80211_key *key = tx->key;
1034         struct ieee80211_mmie_16 *mmie;
1035         struct ieee80211_hdr *hdr;
1036         u8 aad[GMAC_AAD_LEN];
1037         u64 pn64;
1038         u8 nonce[GMAC_NONCE_LEN];
1039
1040         if (WARN_ON(skb_queue_len(&tx->skbs) != 1))
1041                 return TX_DROP;
1042
1043         skb = skb_peek(&tx->skbs);
1044
1045         info = IEEE80211_SKB_CB(skb);
1046
1047         if (info->control.hw_key &&
1048             !(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIE))
1049                 return TX_CONTINUE;
1050
1051         if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
1052                 return TX_DROP;
1053
1054         mmie = skb_put(skb, sizeof(*mmie));
1055         mmie->element_id = WLAN_EID_MMIE;
1056         mmie->length = sizeof(*mmie) - 2;
1057         mmie->key_id = cpu_to_le16(key->conf.keyidx);
1058
1059         /* PN = PN + 1 */
1060         pn64 = atomic64_inc_return(&key->conf.tx_pn);
1061
1062         bip_ipn_set64(mmie->sequence_number, pn64);
1063
1064         if (info->control.hw_key)
1065                 return TX_CONTINUE;
1066
1067         bip_aad(skb, aad);
1068
1069         hdr = (struct ieee80211_hdr *)skb->data;
1070         memcpy(nonce, hdr->addr2, ETH_ALEN);
1071         bip_ipn_swap(nonce + ETH_ALEN, mmie->sequence_number);
1072
1073         /* MIC = AES-GMAC(IGTK, AAD || Management Frame Body || MMIE, 128) */
1074         if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1075                                skb->data + 24, skb->len - 24, mmie->mic) < 0)
1076                 return TX_DROP;
1077
1078         return TX_CONTINUE;
1079 }
1080
1081 ieee80211_rx_result
1082 ieee80211_crypto_aes_gmac_decrypt(struct ieee80211_rx_data *rx)
1083 {
1084         struct sk_buff *skb = rx->skb;
1085         struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
1086         struct ieee80211_key *key = rx->key;
1087         struct ieee80211_mmie_16 *mmie;
1088         u8 aad[GMAC_AAD_LEN], *mic, ipn[6], nonce[GMAC_NONCE_LEN];
1089         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1090
1091         if (!ieee80211_is_mgmt(hdr->frame_control))
1092                 return RX_CONTINUE;
1093
1094         /* management frames are already linear */
1095
1096         if (skb->len < 24 + sizeof(*mmie))
1097                 return RX_DROP_U_SHORT_GMAC;
1098
1099         mmie = (struct ieee80211_mmie_16 *)
1100                 (skb->data + skb->len - sizeof(*mmie));
1101         if (mmie->element_id != WLAN_EID_MMIE ||
1102             mmie->length != sizeof(*mmie) - 2)
1103                 return RX_DROP_U_BAD_MMIE; /* Invalid MMIE */
1104
1105         bip_ipn_swap(ipn, mmie->sequence_number);
1106
1107         if (memcmp(ipn, key->u.aes_gmac.rx_pn, 6) <= 0) {
1108                 key->u.aes_gmac.replays++;
1109                 return RX_DROP_U_REPLAY;
1110         }
1111
1112         if (!(status->flag & RX_FLAG_DECRYPTED)) {
1113                 /* hardware didn't decrypt/verify MIC */
1114                 bip_aad(skb, aad);
1115
1116                 memcpy(nonce, hdr->addr2, ETH_ALEN);
1117                 memcpy(nonce + ETH_ALEN, ipn, 6);
1118
1119                 mic = kmalloc(GMAC_MIC_LEN, GFP_ATOMIC);
1120                 if (!mic)
1121                         return RX_DROP_U_OOM;
1122                 if (ieee80211_aes_gmac(key->u.aes_gmac.tfm, aad, nonce,
1123                                        skb->data + 24, skb->len - 24,
1124                                        mic) < 0 ||
1125                     crypto_memneq(mic, mmie->mic, sizeof(mmie->mic))) {
1126                         key->u.aes_gmac.icverrors++;
1127                         kfree(mic);
1128                         return RX_DROP_U_MIC_FAIL;
1129                 }
1130                 kfree(mic);
1131         }
1132
1133         memcpy(key->u.aes_gmac.rx_pn, ipn, 6);
1134
1135         /* Remove MMIE */
1136         skb_trim(skb, skb->len - sizeof(*mmie));
1137
1138         return RX_CONTINUE;
1139 }