1 /* $NetBSD: ieee80211_crypto.c,v 1.16 2013/09/13 20:19:53 joerg Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * Alternatively, this software may be distributed under the terms of the 19 * GNU General Public License ("GPL") version 2 as published by the Free 20 * Software Foundation. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 #ifdef __FreeBSD__ 36 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto.c,v 1.12 2005/08/08 18:46:35 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto.c,v 1.16 2013/09/13 20:19:53 joerg Exp $"); 40 #endif 41 42 #include "opt_inet.h" 43 44 /* 45 * IEEE 802.11 generic crypto support. 46 */ 47 #include <sys/param.h> 48 #include <sys/mbuf.h> 49 50 #include <sys/socket.h> 51 #include <sys/sockio.h> 52 #include <sys/endian.h> 53 #include <sys/errno.h> 54 #include <sys/proc.h> 55 #include <sys/sysctl.h> 56 57 #include <net/if.h> 58 #include <net/if_media.h> 59 #include <net/if_arp.h> 60 #include <net/if_ether.h> 61 #include <net/if_llc.h> 62 63 #include <net80211/ieee80211_netbsd.h> 64 #include <net80211/ieee80211_var.h> 65 66 /* 67 * Table of registered cipher modules. 68 */ 69 static const struct ieee80211_cipher *ciphers[IEEE80211_CIPHER_MAX]; 70 71 #ifdef INET 72 #include <netinet/in.h> 73 #include <net/if_ether.h> 74 #endif 75 76 static int _ieee80211_crypto_delkey(struct ieee80211com *, 77 struct ieee80211_key *); 78 79 /* 80 * Default "null" key management routines. 81 */ 82 static int 83 null_key_alloc(struct ieee80211com *ic, const struct ieee80211_key *k, 84 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 85 { 86 if (!(&ic->ic_nw_keys[0] <= k && 87 k < &ic->ic_nw_keys[IEEE80211_WEP_NKID])) { 88 /* 89 * Not in the global key table, the driver should handle this 90 * by allocating a slot in the h/w key table/cache. In 91 * lieu of that return key slot 0 for any unicast key 92 * request. We disallow the request if this is a group key. 93 * This default policy does the right thing for legacy hardware 94 * with a 4 key table. It also handles devices that pass 95 * packets through untouched when marked with the WEP bit 96 * and key index 0. 97 */ 98 if (k->wk_flags & IEEE80211_KEY_GROUP) 99 return 0; 100 *keyix = 0; /* NB: use key index 0 for ucast key */ 101 } else { 102 *keyix = k - ic->ic_nw_keys; 103 } 104 *rxkeyix = IEEE80211_KEYIX_NONE; /* XXX maybe *keyix? */ 105 return 1; 106 } 107 static int 108 null_key_delete(struct ieee80211com *ic, 109 const struct ieee80211_key *k) 110 { 111 return 1; 112 } 113 static int 114 null_key_set(struct ieee80211com *ic, 115 const struct ieee80211_key *k, 116 const u_int8_t mac[IEEE80211_ADDR_LEN]) 117 { 118 return 1; 119 } 120 static void null_key_update(struct ieee80211com *ic) {} 121 122 /* 123 * Write-arounds for common operations. 124 */ 125 static __inline void 126 cipher_detach(struct ieee80211_key *key) 127 { 128 key->wk_cipher->ic_detach(key); 129 } 130 131 /* 132 * Wrappers for driver key management methods. 133 */ 134 static __inline int 135 dev_key_alloc(struct ieee80211com *ic, 136 const struct ieee80211_key *key, 137 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 138 { 139 return ic->ic_crypto.cs_key_alloc(ic, key, keyix, rxkeyix); 140 } 141 142 static __inline int 143 dev_key_delete(struct ieee80211com *ic, 144 const struct ieee80211_key *key) 145 { 146 return ic->ic_crypto.cs_key_delete(ic, key); 147 } 148 149 static __inline int 150 dev_key_set(struct ieee80211com *ic, const struct ieee80211_key *key, 151 const u_int8_t mac[IEEE80211_ADDR_LEN]) 152 { 153 return ic->ic_crypto.cs_key_set(ic, key, mac); 154 } 155 156 /* 157 * Setup crypto support. 158 */ 159 void 160 ieee80211_crypto_attach(struct ieee80211com *ic) 161 { 162 struct ieee80211_crypto_state *cs = &ic->ic_crypto; 163 int i; 164 165 /* NB: we assume everything is pre-zero'd */ 166 cs->cs_def_txkey = IEEE80211_KEYIX_NONE; 167 cs->cs_max_keyix = IEEE80211_WEP_NKID; 168 ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; 169 for (i = 0; i < IEEE80211_WEP_NKID; i++) 170 ieee80211_crypto_resetkey(ic, &cs->cs_nw_keys[i], 171 IEEE80211_KEYIX_NONE); 172 /* 173 * Initialize the driver key support routines to noop entries. 174 * This is useful especially for the cipher test modules. 175 */ 176 cs->cs_key_alloc = null_key_alloc; 177 cs->cs_key_set = null_key_set; 178 cs->cs_key_delete = null_key_delete; 179 cs->cs_key_update_begin = null_key_update; 180 cs->cs_key_update_end = null_key_update; 181 } 182 183 /* 184 * Teardown crypto support. 185 */ 186 void 187 ieee80211_crypto_detach(struct ieee80211com *ic) 188 { 189 ieee80211_crypto_delglobalkeys(ic); 190 } 191 192 /* 193 * Register a crypto cipher module. 194 */ 195 void 196 ieee80211_crypto_register(const struct ieee80211_cipher *cip) 197 { 198 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 199 printf("%s: cipher %s has an invalid cipher index %u\n", 200 __func__, cip->ic_name, cip->ic_cipher); 201 return; 202 } 203 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 204 printf("%s: cipher %s registered with a different template\n", 205 __func__, cip->ic_name); 206 return; 207 } 208 ciphers[cip->ic_cipher] = cip; 209 } 210 211 /* 212 * Unregister a crypto cipher module. 213 */ 214 void 215 ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) 216 { 217 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 218 printf("%s: cipher %s has an invalid cipher index %u\n", 219 __func__, cip->ic_name, cip->ic_cipher); 220 return; 221 } 222 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 223 printf("%s: cipher %s registered with a different template\n", 224 __func__, cip->ic_name); 225 return; 226 } 227 /* NB: don't complain about not being registered */ 228 /* XXX disallow if references */ 229 ciphers[cip->ic_cipher] = NULL; 230 } 231 232 int 233 ieee80211_crypto_available(u_int cipher) 234 { 235 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; 236 } 237 238 /* XXX well-known names! */ 239 static const char *cipher_modnames[] = { 240 "wlan_wep", /* IEEE80211_CIPHER_WEP */ 241 "wlan_tkip", /* IEEE80211_CIPHER_TKIP */ 242 "wlan_aes_ocb", /* IEEE80211_CIPHER_AES_OCB */ 243 "wlan_ccmp", /* IEEE80211_CIPHER_AES_CCM */ 244 "wlan_ckip", /* IEEE80211_CIPHER_CKIP */ 245 }; 246 247 /* 248 * Establish a relationship between the specified key and cipher 249 * and, if necessary, allocate a hardware index from the driver. 250 * Note that when a fixed key index is required it must be specified 251 * and we blindly assign it w/o consulting the driver (XXX). 252 * 253 * This must be the first call applied to a key; all the other key 254 * routines assume wk_cipher is setup. 255 * 256 * Locking must be handled by the caller using: 257 * ieee80211_key_update_begin(ic); 258 * ieee80211_key_update_end(ic); 259 */ 260 int 261 ieee80211_crypto_newkey(struct ieee80211com *ic, 262 int cipher, int flags, struct ieee80211_key *key) 263 { 264 #define N(a) (sizeof(a) / sizeof(a[0])) 265 const struct ieee80211_cipher *cip; 266 ieee80211_keyix keyix, rxkeyix; 267 void *keyctx; 268 int oflags; 269 270 /* 271 * Validate cipher and set reference to cipher routines. 272 */ 273 if (cipher >= IEEE80211_CIPHER_MAX) { 274 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 275 "%s: invalid cipher %u\n", __func__, cipher); 276 ic->ic_stats.is_crypto_badcipher++; 277 return 0; 278 } 279 cip = ciphers[cipher]; 280 if (cip == NULL) { 281 /* 282 * Auto-load cipher module if we have a well-known name 283 * for it. It might be better to use string names rather 284 * than numbers and craft a module name based on the cipher 285 * name; e.g. wlan_cipher_<cipher-name>. 286 */ 287 if (cipher < N(cipher_modnames)) { 288 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 289 "%s: unregistered cipher %u, load module %s\n", 290 __func__, cipher, cipher_modnames[cipher]); 291 ieee80211_load_module(cipher_modnames[cipher]); 292 /* 293 * If cipher module loaded it should immediately 294 * call ieee80211_crypto_register which will fill 295 * in the entry in the ciphers array. 296 */ 297 cip = ciphers[cipher]; 298 } 299 if (cip == NULL) { 300 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 301 "%s: unable to load cipher %u, module %s\n", 302 __func__, cipher, 303 cipher < N(cipher_modnames) ? 304 cipher_modnames[cipher] : "<unknown>"); 305 ic->ic_stats.is_crypto_nocipher++; 306 return 0; 307 } 308 } 309 310 oflags = key->wk_flags; 311 flags &= IEEE80211_KEY_COMMON; 312 /* 313 * If the hardware does not support the cipher then 314 * fallback to a host-based implementation. 315 */ 316 if ((ic->ic_caps & (1<<cipher)) == 0) { 317 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 318 "%s: no h/w support for cipher %s, falling back to s/w\n", 319 __func__, cip->ic_name); 320 flags |= IEEE80211_KEY_SWCRYPT; 321 } 322 /* 323 * Hardware TKIP with software MIC is an important 324 * combination; we handle it by flagging each key, 325 * the cipher modules honor it. 326 */ 327 if (cipher == IEEE80211_CIPHER_TKIP && 328 (ic->ic_caps & IEEE80211_C_TKIPMIC) == 0) { 329 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 330 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 331 __func__); 332 flags |= IEEE80211_KEY_SWMIC; 333 } 334 335 /* 336 * Bind cipher to key instance. Note we do this 337 * after checking the device capabilities so the 338 * cipher module can optimize space usage based on 339 * whether or not it needs to do the cipher work. 340 */ 341 if (key->wk_cipher != cip || key->wk_flags != flags) { 342 again: 343 /* 344 * Fillin the flags so cipher modules can see s/w 345 * crypto requirements and potentially allocate 346 * different state and/or attach different method 347 * pointers. 348 * 349 * XXX this is not right when s/w crypto fallback 350 * fails and we try to restore previous state. 351 */ 352 key->wk_flags = flags; 353 keyctx = cip->ic_attach(ic, key); 354 if (keyctx == NULL) { 355 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 356 "%s: unable to attach cipher %s\n", 357 __func__, cip->ic_name); 358 key->wk_flags = oflags; /* restore old flags */ 359 ic->ic_stats.is_crypto_attachfail++; 360 return 0; 361 } 362 cipher_detach(key); 363 key->wk_cipher = cip; /* XXX refcnt? */ 364 key->wk_private = keyctx; 365 } 366 /* 367 * Commit to requested usage so driver can see the flags. 368 */ 369 key->wk_flags = flags; 370 371 /* 372 * Ask the driver for a key index if we don't have one. 373 * Note that entries in the global key table always have 374 * an index; this means it's safe to call this routine 375 * for these entries just to setup the reference to the 376 * cipher template. Note also that when using software 377 * crypto we also call the driver to give us a key index. 378 */ 379 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 380 if (!dev_key_alloc(ic, key, &keyix, &rxkeyix)) { 381 /* 382 * Driver has no room; fallback to doing crypto 383 * in the host. We change the flags and start the 384 * procedure over. If we get back here then there's 385 * no hope and we bail. Note that this can leave 386 * the key in a inconsistent state if the caller 387 * continues to use it. 388 */ 389 if ((key->wk_flags & IEEE80211_KEY_SWCRYPT) == 0) { 390 ic->ic_stats.is_crypto_swfallback++; 391 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 392 "%s: no h/w resources for cipher %s, " 393 "falling back to s/w\n", __func__, 394 cip->ic_name); 395 oflags = key->wk_flags; 396 flags |= IEEE80211_KEY_SWCRYPT; 397 if (cipher == IEEE80211_CIPHER_TKIP) 398 flags |= IEEE80211_KEY_SWMIC; 399 goto again; 400 } 401 ic->ic_stats.is_crypto_keyfail++; 402 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 403 "%s: unable to setup cipher %s\n", 404 __func__, cip->ic_name); 405 return 0; 406 } 407 key->wk_keyix = keyix; 408 key->wk_rxkeyix = rxkeyix; 409 } 410 return 1; 411 #undef N 412 } 413 414 /* 415 * Remove the key (no locking, for internal use). 416 */ 417 static int 418 _ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 419 { 420 ieee80211_keyix keyix; 421 422 IASSERT(key->wk_cipher != NULL, ("No cipher!")); 423 424 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 425 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 426 __func__, key->wk_cipher->ic_name, 427 key->wk_keyix, key->wk_flags, 428 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 429 430 keyix = key->wk_keyix; 431 if (keyix != IEEE80211_KEYIX_NONE) { 432 /* 433 * Remove hardware entry. 434 */ 435 /* XXX key cache */ 436 if (!dev_key_delete(ic, key)) { 437 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 438 "%s: driver did not delete key index %u\n", 439 __func__, keyix); 440 ic->ic_stats.is_crypto_delkey++; 441 /* XXX recovery? */ 442 } 443 } 444 cipher_detach(key); 445 memset(key, 0, sizeof(*key)); 446 ieee80211_crypto_resetkey(ic, key, IEEE80211_KEYIX_NONE); 447 return 1; 448 } 449 450 /* 451 * Remove the specified key. 452 */ 453 int 454 ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 455 { 456 int status; 457 458 ieee80211_key_update_begin(ic); 459 status = _ieee80211_crypto_delkey(ic, key); 460 ieee80211_key_update_end(ic); 461 return status; 462 } 463 464 /* 465 * Clear the global key table. 466 */ 467 void 468 ieee80211_crypto_delglobalkeys(struct ieee80211com *ic) 469 { 470 int i; 471 472 ieee80211_key_update_begin(ic); 473 for (i = 0; i < IEEE80211_WEP_NKID; i++) 474 (void) _ieee80211_crypto_delkey(ic, &ic->ic_nw_keys[i]); 475 ieee80211_key_update_end(ic); 476 } 477 478 /* 479 * Set the contents of the specified key. 480 * 481 * Locking must be handled by the caller using: 482 * ieee80211_key_update_begin(ic); 483 * ieee80211_key_update_end(ic); 484 */ 485 int 486 ieee80211_crypto_setkey(struct ieee80211com *ic, struct ieee80211_key *key, 487 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 488 { 489 const struct ieee80211_cipher *cip = key->wk_cipher; 490 491 IASSERT(cip != NULL, ("No cipher!")); 492 493 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 494 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 495 __func__, cip->ic_name, key->wk_keyix, 496 key->wk_flags, ether_sprintf(macaddr), 497 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 498 499 /* 500 * Give cipher a chance to validate key contents. 501 * XXX should happen before modifying state. 502 */ 503 if (!cip->ic_setkey(key)) { 504 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 505 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 506 __func__, cip->ic_name, key->wk_keyix, 507 key->wk_keylen, key->wk_flags); 508 ic->ic_stats.is_crypto_setkey_cipher++; 509 return 0; 510 } 511 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 512 /* XXX nothing allocated, should not happen */ 513 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 514 "%s: no key index; should not happen!\n", __func__); 515 ic->ic_stats.is_crypto_setkey_nokey++; 516 return 0; 517 } 518 return dev_key_set(ic, key, macaddr); 519 } 520 521 /* 522 * Add privacy headers appropriate for the specified key. 523 */ 524 struct ieee80211_key * 525 ieee80211_crypto_encap(struct ieee80211com *ic, 526 struct ieee80211_node *ni, struct mbuf *m) 527 { 528 struct ieee80211_key *k; 529 struct ieee80211_frame *wh; 530 const struct ieee80211_cipher *cip; 531 u_int8_t keyid; 532 533 /* 534 * Multicast traffic always uses the multicast key. 535 * Otherwise if a unicast key is set we use that and 536 * it is always key index 0. When no unicast key is 537 * set we fall back to the default transmit key. 538 */ 539 wh = mtod(m, struct ieee80211_frame *); 540 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 541 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) { 542 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE) { 543 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 544 "[%s] no default transmit key (%s) deftxkey %u\n", 545 ether_sprintf(wh->i_addr1), __func__, 546 ic->ic_def_txkey); 547 ic->ic_stats.is_tx_nodefkey++; 548 return NULL; 549 } 550 keyid = ic->ic_def_txkey; 551 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 552 } else { 553 keyid = 0; 554 k = &ni->ni_ucastkey; 555 } 556 cip = k->wk_cipher; 557 return (cip->ic_encap(k, m, keyid<<6) ? k : NULL); 558 } 559 560 /* 561 * Validate and strip privacy headers (and trailer) for a 562 * received frame that has the WEP/Privacy bit set. 563 */ 564 struct ieee80211_key * 565 ieee80211_crypto_decap(struct ieee80211com *ic, 566 struct ieee80211_node *ni, struct mbuf *m, int hdrlen) 567 { 568 #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) 569 #define IEEE80211_WEP_MINLEN \ 570 (sizeof(struct ieee80211_frame) + \ 571 IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) 572 struct ieee80211_key *k; 573 struct ieee80211_frame *wh; 574 const struct ieee80211_cipher *cip; 575 u_int8_t keyid; 576 577 /* NB: this minimum size data frame could be bigger */ 578 if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { 579 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 580 "%s: WEP data frame too short, len %u\n", 581 __func__, m->m_pkthdr.len); 582 ic->ic_stats.is_rx_tooshort++; /* XXX need unique stat? */ 583 return NULL; 584 } 585 586 /* 587 * Locate the key. If unicast and there is no unicast 588 * key then we fall back to the key id in the header. 589 * This assumes unicast keys are only configured when 590 * the key id in the header is meaningless (typically 0). 591 */ 592 wh = mtod(m, struct ieee80211_frame *); 593 m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid); 594 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 595 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) 596 k = &ic->ic_nw_keys[keyid >> 6]; 597 else 598 k = &ni->ni_ucastkey; 599 600 /* 601 * Insure crypto header is contiguous for all decap work. 602 */ 603 cip = k->wk_cipher; 604 if (m->m_len < hdrlen + cip->ic_header && 605 (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) { 606 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 607 "[%s] unable to pullup %s header\n", 608 ether_sprintf(wh->i_addr2), cip->ic_name); 609 ic->ic_stats.is_rx_wepfail++; /* XXX */ 610 return NULL; 611 } 612 613 return (cip->ic_decap(k, m, hdrlen) ? k : NULL); 614 #undef IEEE80211_WEP_MINLEN 615 #undef IEEE80211_WEP_HDRLEN 616 } 617