1 /*- 2 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 /* 30 * IEEE 802.11i AES-CCMP crypto support. 31 * 32 * Part of this module is derived from similar code in the Host 33 * AP driver. The code is used with the consent of the author and 34 * it's license is included below. 35 */ 36 #include "opt_wlan.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/mbuf.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 45 #include <sys/socket.h> 46 47 #include <net/if.h> 48 #include <net/if_media.h> 49 #include <net/ethernet.h> 50 51 #include <net80211/ieee80211_var.h> 52 53 #include <crypto/rijndael/rijndael.h> 54 55 #define AES_BLOCK_LEN 16 56 57 struct ccmp_ctx { 58 struct ieee80211vap *cc_vap; /* for diagnostics+statistics */ 59 struct ieee80211com *cc_ic; 60 rijndael_ctx cc_aes; 61 }; 62 63 static void *ccmp_attach(struct ieee80211vap *, struct ieee80211_key *); 64 static void ccmp_detach(struct ieee80211_key *); 65 static int ccmp_setkey(struct ieee80211_key *); 66 static int ccmp_encap(struct ieee80211_key *k, struct mbuf *, uint8_t keyid); 67 static int ccmp_decap(struct ieee80211_key *, struct mbuf *, int); 68 static int ccmp_enmic(struct ieee80211_key *, struct mbuf *, int); 69 static int ccmp_demic(struct ieee80211_key *, struct mbuf *, int); 70 71 static const struct ieee80211_cipher ccmp = { 72 .ic_name = "AES-CCM", 73 .ic_cipher = IEEE80211_CIPHER_AES_CCM, 74 .ic_header = IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN + 75 IEEE80211_WEP_EXTIVLEN, 76 .ic_trailer = IEEE80211_WEP_MICLEN, 77 .ic_miclen = 0, 78 .ic_attach = ccmp_attach, 79 .ic_detach = ccmp_detach, 80 .ic_setkey = ccmp_setkey, 81 .ic_encap = ccmp_encap, 82 .ic_decap = ccmp_decap, 83 .ic_enmic = ccmp_enmic, 84 .ic_demic = ccmp_demic, 85 }; 86 87 static int ccmp_encrypt(struct ieee80211_key *, struct mbuf *, int hdrlen); 88 static int ccmp_decrypt(struct ieee80211_key *, u_int64_t pn, 89 struct mbuf *, int hdrlen); 90 91 /* number of references from net80211 layer */ 92 static int nrefs = 0; 93 94 static void * 95 ccmp_attach(struct ieee80211vap *vap, struct ieee80211_key *k) 96 { 97 struct ccmp_ctx *ctx; 98 99 ctx = (struct ccmp_ctx *) malloc(sizeof(struct ccmp_ctx), 100 M_80211_CRYPTO, M_NOWAIT | M_ZERO); 101 if (ctx == NULL) { 102 vap->iv_stats.is_crypto_nomem++; 103 return NULL; 104 } 105 ctx->cc_vap = vap; 106 ctx->cc_ic = vap->iv_ic; 107 nrefs++; /* NB: we assume caller locking */ 108 return ctx; 109 } 110 111 static void 112 ccmp_detach(struct ieee80211_key *k) 113 { 114 struct ccmp_ctx *ctx = k->wk_private; 115 116 free(ctx, M_80211_CRYPTO); 117 KASSERT(nrefs > 0, ("imbalanced attach/detach")); 118 nrefs--; /* NB: we assume caller locking */ 119 } 120 121 static int 122 ccmp_setkey(struct ieee80211_key *k) 123 { 124 struct ccmp_ctx *ctx = k->wk_private; 125 126 if (k->wk_keylen != (128/NBBY)) { 127 IEEE80211_DPRINTF(ctx->cc_vap, IEEE80211_MSG_CRYPTO, 128 "%s: Invalid key length %u, expecting %u\n", 129 __func__, k->wk_keylen, 128/NBBY); 130 return 0; 131 } 132 if (k->wk_flags & IEEE80211_KEY_SWENCRYPT) 133 rijndael_set_key(&ctx->cc_aes, k->wk_key, k->wk_keylen*NBBY); 134 return 1; 135 } 136 137 /* 138 * Add privacy headers appropriate for the specified key. 139 */ 140 static int 141 ccmp_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) 142 { 143 struct ccmp_ctx *ctx = k->wk_private; 144 struct ieee80211com *ic = ctx->cc_ic; 145 uint8_t *ivp; 146 int hdrlen; 147 148 hdrlen = ieee80211_hdrspace(ic, mtod(m, void *)); 149 150 /* 151 * Copy down 802.11 header and add the IV, KeyID, and ExtIV. 152 */ 153 M_PREPEND(m, ccmp.ic_header, M_NOWAIT); 154 if (m == NULL) 155 return 0; 156 ivp = mtod(m, uint8_t *); 157 ovbcopy(ivp + ccmp.ic_header, ivp, hdrlen); 158 ivp += hdrlen; 159 160 k->wk_keytsc++; /* XXX wrap at 48 bits */ 161 ivp[0] = k->wk_keytsc >> 0; /* PN0 */ 162 ivp[1] = k->wk_keytsc >> 8; /* PN1 */ 163 ivp[2] = 0; /* Reserved */ 164 ivp[3] = keyid | IEEE80211_WEP_EXTIV; /* KeyID | ExtID */ 165 ivp[4] = k->wk_keytsc >> 16; /* PN2 */ 166 ivp[5] = k->wk_keytsc >> 24; /* PN3 */ 167 ivp[6] = k->wk_keytsc >> 32; /* PN4 */ 168 ivp[7] = k->wk_keytsc >> 40; /* PN5 */ 169 170 /* 171 * Finally, do software encrypt if neeed. 172 */ 173 if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) && 174 !ccmp_encrypt(k, m, hdrlen)) 175 return 0; 176 177 return 1; 178 } 179 180 /* 181 * Add MIC to the frame as needed. 182 */ 183 static int 184 ccmp_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 185 { 186 187 return 1; 188 } 189 190 static __inline uint64_t 191 READ_6(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3, uint8_t b4, uint8_t b5) 192 { 193 uint32_t iv32 = (b0 << 0) | (b1 << 8) | (b2 << 16) | (b3 << 24); 194 uint16_t iv16 = (b4 << 0) | (b5 << 8); 195 return (((uint64_t)iv16) << 32) | iv32; 196 } 197 198 /* 199 * Validate and strip privacy headers (and trailer) for a 200 * received frame. The specified key should be correct but 201 * is also verified. 202 */ 203 static int 204 ccmp_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 205 { 206 struct ccmp_ctx *ctx = k->wk_private; 207 struct ieee80211vap *vap = ctx->cc_vap; 208 struct ieee80211_frame *wh; 209 uint8_t *ivp, tid; 210 uint64_t pn; 211 212 /* 213 * Header should have extended IV and sequence number; 214 * verify the former and validate the latter. 215 */ 216 wh = mtod(m, struct ieee80211_frame *); 217 ivp = mtod(m, uint8_t *) + hdrlen; 218 if ((ivp[IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV) == 0) { 219 /* 220 * No extended IV; discard frame. 221 */ 222 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 223 "%s", "missing ExtIV for AES-CCM cipher"); 224 vap->iv_stats.is_rx_ccmpformat++; 225 return 0; 226 } 227 tid = ieee80211_gettid(wh); 228 pn = READ_6(ivp[0], ivp[1], ivp[4], ivp[5], ivp[6], ivp[7]); 229 if (pn <= k->wk_keyrsc[tid]) { 230 /* 231 * Replay violation. 232 */ 233 ieee80211_notify_replay_failure(vap, wh, k, pn, tid); 234 vap->iv_stats.is_rx_ccmpreplay++; 235 return 0; 236 } 237 238 /* 239 * Check if the device handled the decrypt in hardware. 240 * If so we just strip the header; otherwise we need to 241 * handle the decrypt in software. Note that for the 242 * latter we leave the header in place for use in the 243 * decryption work. 244 */ 245 if ((k->wk_flags & IEEE80211_KEY_SWDECRYPT) && 246 !ccmp_decrypt(k, pn, m, hdrlen)) 247 return 0; 248 249 /* 250 * Copy up 802.11 header and strip crypto bits. 251 */ 252 ovbcopy(mtod(m, void *), mtod(m, uint8_t *) + ccmp.ic_header, hdrlen); 253 m_adj(m, ccmp.ic_header); 254 m_adj(m, -ccmp.ic_trailer); 255 256 /* 257 * Ok to update rsc now. 258 */ 259 k->wk_keyrsc[tid] = pn; 260 261 return 1; 262 } 263 264 /* 265 * Verify and strip MIC from the frame. 266 */ 267 static int 268 ccmp_demic(struct ieee80211_key *k, struct mbuf *m, int force) 269 { 270 return 1; 271 } 272 273 static __inline void 274 xor_block(uint8_t *b, const uint8_t *a, size_t len) 275 { 276 int i; 277 for (i = 0; i < len; i++) 278 b[i] ^= a[i]; 279 } 280 281 /* 282 * Host AP crypt: host-based CCMP encryption implementation for Host AP driver 283 * 284 * Copyright (c) 2003-2004, Jouni Malinen <jkmaline@cc.hut.fi> 285 * 286 * This program is free software; you can redistribute it and/or modify 287 * it under the terms of the GNU General Public License version 2 as 288 * published by the Free Software Foundation. See README and COPYING for 289 * more details. 290 * 291 * Alternatively, this software may be distributed under the terms of BSD 292 * license. 293 */ 294 295 static void 296 ccmp_init_blocks(rijndael_ctx *ctx, struct ieee80211_frame *wh, 297 u_int64_t pn, size_t dlen, 298 uint8_t b0[AES_BLOCK_LEN], uint8_t aad[2 * AES_BLOCK_LEN], 299 uint8_t auth[AES_BLOCK_LEN], uint8_t s0[AES_BLOCK_LEN]) 300 { 301 #define IS_QOS_DATA(wh) IEEE80211_QOS_HAS_SEQ(wh) 302 303 /* CCM Initial Block: 304 * Flag (Include authentication header, M=3 (8-octet MIC), 305 * L=1 (2-octet Dlen)) 306 * Nonce: 0x00 | A2 | PN 307 * Dlen */ 308 b0[0] = 0x59; 309 /* NB: b0[1] set below */ 310 IEEE80211_ADDR_COPY(b0 + 2, wh->i_addr2); 311 b0[8] = pn >> 40; 312 b0[9] = pn >> 32; 313 b0[10] = pn >> 24; 314 b0[11] = pn >> 16; 315 b0[12] = pn >> 8; 316 b0[13] = pn >> 0; 317 b0[14] = (dlen >> 8) & 0xff; 318 b0[15] = dlen & 0xff; 319 320 /* AAD: 321 * FC with bits 4..6 and 11..13 masked to zero; 14 is always one 322 * A1 | A2 | A3 323 * SC with bits 4..15 (seq#) masked to zero 324 * A4 (if present) 325 * QC (if present) 326 */ 327 aad[0] = 0; /* AAD length >> 8 */ 328 /* NB: aad[1] set below */ 329 aad[2] = wh->i_fc[0] & 0x8f; /* XXX magic #s */ 330 aad[3] = wh->i_fc[1] & 0xc7; /* XXX magic #s */ 331 /* NB: we know 3 addresses are contiguous */ 332 memcpy(aad + 4, wh->i_addr1, 3 * IEEE80211_ADDR_LEN); 333 aad[22] = wh->i_seq[0] & IEEE80211_SEQ_FRAG_MASK; 334 aad[23] = 0; /* all bits masked */ 335 /* 336 * Construct variable-length portion of AAD based 337 * on whether this is a 4-address frame/QOS frame. 338 * We always zero-pad to 32 bytes before running it 339 * through the cipher. 340 * 341 * We also fill in the priority bits of the CCM 342 * initial block as we know whether or not we have 343 * a QOS frame. 344 */ 345 if (IEEE80211_IS_DSTODS(wh)) { 346 IEEE80211_ADDR_COPY(aad + 24, 347 ((struct ieee80211_frame_addr4 *)wh)->i_addr4); 348 if (IS_QOS_DATA(wh)) { 349 struct ieee80211_qosframe_addr4 *qwh4 = 350 (struct ieee80211_qosframe_addr4 *) wh; 351 aad[30] = qwh4->i_qos[0] & 0x0f;/* just priority bits */ 352 aad[31] = 0; 353 b0[1] = aad[30]; 354 aad[1] = 22 + IEEE80211_ADDR_LEN + 2; 355 } else { 356 *(uint16_t *)&aad[30] = 0; 357 b0[1] = 0; 358 aad[1] = 22 + IEEE80211_ADDR_LEN; 359 } 360 } else { 361 if (IS_QOS_DATA(wh)) { 362 struct ieee80211_qosframe *qwh = 363 (struct ieee80211_qosframe*) wh; 364 aad[24] = qwh->i_qos[0] & 0x0f; /* just priority bits */ 365 aad[25] = 0; 366 b0[1] = aad[24]; 367 aad[1] = 22 + 2; 368 } else { 369 *(uint16_t *)&aad[24] = 0; 370 b0[1] = 0; 371 aad[1] = 22; 372 } 373 *(uint16_t *)&aad[26] = 0; 374 *(uint32_t *)&aad[28] = 0; 375 } 376 377 /* Start with the first block and AAD */ 378 rijndael_encrypt(ctx, b0, auth); 379 xor_block(auth, aad, AES_BLOCK_LEN); 380 rijndael_encrypt(ctx, auth, auth); 381 xor_block(auth, &aad[AES_BLOCK_LEN], AES_BLOCK_LEN); 382 rijndael_encrypt(ctx, auth, auth); 383 b0[0] &= 0x07; 384 b0[14] = b0[15] = 0; 385 rijndael_encrypt(ctx, b0, s0); 386 #undef IS_QOS_DATA 387 } 388 389 #define CCMP_ENCRYPT(_i, _b, _b0, _pos, _e, _len) do { \ 390 /* Authentication */ \ 391 xor_block(_b, _pos, _len); \ 392 rijndael_encrypt(&ctx->cc_aes, _b, _b); \ 393 /* Encryption, with counter */ \ 394 _b0[14] = (_i >> 8) & 0xff; \ 395 _b0[15] = _i & 0xff; \ 396 rijndael_encrypt(&ctx->cc_aes, _b0, _e); \ 397 xor_block(_pos, _e, _len); \ 398 } while (0) 399 400 static int 401 ccmp_encrypt(struct ieee80211_key *key, struct mbuf *m0, int hdrlen) 402 { 403 struct ccmp_ctx *ctx = key->wk_private; 404 struct ieee80211_frame *wh; 405 struct mbuf *m = m0; 406 int data_len, i, space; 407 uint8_t aad[2 * AES_BLOCK_LEN], b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], 408 e[AES_BLOCK_LEN], s0[AES_BLOCK_LEN]; 409 uint8_t *pos; 410 411 ctx->cc_vap->iv_stats.is_crypto_ccmp++; 412 413 wh = mtod(m, struct ieee80211_frame *); 414 data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header); 415 ccmp_init_blocks(&ctx->cc_aes, wh, key->wk_keytsc, 416 data_len, b0, aad, b, s0); 417 418 i = 1; 419 pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header; 420 /* NB: assumes header is entirely in first mbuf */ 421 space = m->m_len - (hdrlen + ccmp.ic_header); 422 for (;;) { 423 if (space > data_len) 424 space = data_len; 425 /* 426 * Do full blocks. 427 */ 428 while (space >= AES_BLOCK_LEN) { 429 CCMP_ENCRYPT(i, b, b0, pos, e, AES_BLOCK_LEN); 430 pos += AES_BLOCK_LEN, space -= AES_BLOCK_LEN; 431 data_len -= AES_BLOCK_LEN; 432 i++; 433 } 434 if (data_len <= 0) /* no more data */ 435 break; 436 m = m->m_next; 437 if (m == NULL) { /* last buffer */ 438 if (space != 0) { 439 /* 440 * Short last block. 441 */ 442 CCMP_ENCRYPT(i, b, b0, pos, e, space); 443 } 444 break; 445 } 446 if (space != 0) { 447 uint8_t *pos_next; 448 int space_next; 449 int len, dl, sp; 450 struct mbuf *n; 451 452 /* 453 * Block straddles one or more mbufs, gather data 454 * into the block buffer b, apply the cipher, then 455 * scatter the results back into the mbuf chain. 456 * The buffer will automatically get space bytes 457 * of data at offset 0 copied in+out by the 458 * CCMP_ENCRYPT request so we must take care of 459 * the remaining data. 460 */ 461 n = m; 462 dl = data_len; 463 sp = space; 464 for (;;) { 465 pos_next = mtod(n, uint8_t *); 466 len = min(dl, AES_BLOCK_LEN); 467 space_next = len > sp ? len - sp : 0; 468 if (n->m_len >= space_next) { 469 /* 470 * This mbuf has enough data; just grab 471 * what we need and stop. 472 */ 473 xor_block(b+sp, pos_next, space_next); 474 break; 475 } 476 /* 477 * This mbuf's contents are insufficient, 478 * take 'em all and prepare to advance to 479 * the next mbuf. 480 */ 481 xor_block(b+sp, pos_next, n->m_len); 482 sp += n->m_len, dl -= n->m_len; 483 n = n->m_next; 484 if (n == NULL) 485 break; 486 } 487 488 CCMP_ENCRYPT(i, b, b0, pos, e, space); 489 490 /* NB: just like above, but scatter data to mbufs */ 491 dl = data_len; 492 sp = space; 493 for (;;) { 494 pos_next = mtod(m, uint8_t *); 495 len = min(dl, AES_BLOCK_LEN); 496 space_next = len > sp ? len - sp : 0; 497 if (m->m_len >= space_next) { 498 xor_block(pos_next, e+sp, space_next); 499 break; 500 } 501 xor_block(pos_next, e+sp, m->m_len); 502 sp += m->m_len, dl -= m->m_len; 503 m = m->m_next; 504 if (m == NULL) 505 goto done; 506 } 507 /* 508 * Do bookkeeping. m now points to the last mbuf 509 * we grabbed data from. We know we consumed a 510 * full block of data as otherwise we'd have hit 511 * the end of the mbuf chain, so deduct from data_len. 512 * Otherwise advance the block number (i) and setup 513 * pos+space to reflect contents of the new mbuf. 514 */ 515 data_len -= AES_BLOCK_LEN; 516 i++; 517 pos = pos_next + space_next; 518 space = m->m_len - space_next; 519 } else { 520 /* 521 * Setup for next buffer. 522 */ 523 pos = mtod(m, uint8_t *); 524 space = m->m_len; 525 } 526 } 527 done: 528 /* tack on MIC */ 529 xor_block(b, s0, ccmp.ic_trailer); 530 return m_append(m0, ccmp.ic_trailer, b); 531 } 532 #undef CCMP_ENCRYPT 533 534 #define CCMP_DECRYPT(_i, _b, _b0, _pos, _a, _len) do { \ 535 /* Decrypt, with counter */ \ 536 _b0[14] = (_i >> 8) & 0xff; \ 537 _b0[15] = _i & 0xff; \ 538 rijndael_encrypt(&ctx->cc_aes, _b0, _b); \ 539 xor_block(_pos, _b, _len); \ 540 /* Authentication */ \ 541 xor_block(_a, _pos, _len); \ 542 rijndael_encrypt(&ctx->cc_aes, _a, _a); \ 543 } while (0) 544 545 static int 546 ccmp_decrypt(struct ieee80211_key *key, u_int64_t pn, struct mbuf *m, int hdrlen) 547 { 548 struct ccmp_ctx *ctx = key->wk_private; 549 struct ieee80211vap *vap = ctx->cc_vap; 550 struct ieee80211_frame *wh; 551 uint8_t aad[2 * AES_BLOCK_LEN]; 552 uint8_t b0[AES_BLOCK_LEN], b[AES_BLOCK_LEN], a[AES_BLOCK_LEN]; 553 uint8_t mic[AES_BLOCK_LEN]; 554 size_t data_len; 555 int i; 556 uint8_t *pos; 557 u_int space; 558 559 ctx->cc_vap->iv_stats.is_crypto_ccmp++; 560 561 wh = mtod(m, struct ieee80211_frame *); 562 data_len = m->m_pkthdr.len - (hdrlen + ccmp.ic_header + ccmp.ic_trailer); 563 ccmp_init_blocks(&ctx->cc_aes, wh, pn, data_len, b0, aad, a, b); 564 m_copydata(m, m->m_pkthdr.len - ccmp.ic_trailer, ccmp.ic_trailer, mic); 565 xor_block(mic, b, ccmp.ic_trailer); 566 567 i = 1; 568 pos = mtod(m, uint8_t *) + hdrlen + ccmp.ic_header; 569 space = m->m_len - (hdrlen + ccmp.ic_header); 570 for (;;) { 571 if (space > data_len) 572 space = data_len; 573 while (space >= AES_BLOCK_LEN) { 574 CCMP_DECRYPT(i, b, b0, pos, a, AES_BLOCK_LEN); 575 pos += AES_BLOCK_LEN, space -= AES_BLOCK_LEN; 576 data_len -= AES_BLOCK_LEN; 577 i++; 578 } 579 if (data_len <= 0) /* no more data */ 580 break; 581 m = m->m_next; 582 if (m == NULL) { /* last buffer */ 583 if (space != 0) /* short last block */ 584 CCMP_DECRYPT(i, b, b0, pos, a, space); 585 break; 586 } 587 if (space != 0) { 588 uint8_t *pos_next; 589 u_int space_next; 590 u_int len; 591 592 /* 593 * Block straddles buffers, split references. We 594 * do not handle splits that require >2 buffers 595 * since rx'd frames are never badly fragmented 596 * because drivers typically recv in clusters. 597 */ 598 pos_next = mtod(m, uint8_t *); 599 len = min(data_len, AES_BLOCK_LEN); 600 space_next = len > space ? len - space : 0; 601 KASSERT(m->m_len >= space_next, 602 ("not enough data in following buffer, " 603 "m_len %u need %u\n", m->m_len, space_next)); 604 605 xor_block(b+space, pos_next, space_next); 606 CCMP_DECRYPT(i, b, b0, pos, a, space); 607 xor_block(pos_next, b+space, space_next); 608 data_len -= len; 609 i++; 610 611 pos = pos_next + space_next; 612 space = m->m_len - space_next; 613 } else { 614 /* 615 * Setup for next buffer. 616 */ 617 pos = mtod(m, uint8_t *); 618 space = m->m_len; 619 } 620 } 621 if (memcmp(mic, a, ccmp.ic_trailer) != 0) { 622 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 623 "%s", "AES-CCM decrypt failed; MIC mismatch"); 624 vap->iv_stats.is_rx_ccmpmic++; 625 return 0; 626 } 627 return 1; 628 } 629 #undef CCMP_DECRYPT 630 631 /* 632 * Module glue. 633 */ 634 IEEE80211_CRYPTO_MODULE(ccmp, 1); 635