1 /* $NetBSD: ieee80211_crypto.c,v 1.10 2005/11/18 16:40:08 skrll 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 1.10 2005/11/18 16:40:08 skrll 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 #include <crypto/arc4/arc4.h> /* XXX unneeded? */ 77 static int _ieee80211_crypto_delkey(struct ieee80211com *, 78 struct ieee80211_key *); 79 80 /* 81 * Default "null" key management routines. 82 */ 83 static int 84 null_key_alloc(struct ieee80211com *ic, const struct ieee80211_key *k, 85 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 86 { 87 if (!(&ic->ic_nw_keys[0] <= k && 88 k < &ic->ic_nw_keys[IEEE80211_WEP_NKID])) { 89 /* 90 * Not in the global key table, the driver should handle this 91 * by allocating a slot in the h/w key table/cache. In 92 * lieu of that return key slot 0 for any unicast key 93 * request. We disallow the request if this is a group key. 94 * This default policy does the right thing for legacy hardware 95 * with a 4 key table. It also handles devices that pass 96 * packets through untouched when marked with the WEP bit 97 * and key index 0. 98 */ 99 if (k->wk_flags & IEEE80211_KEY_GROUP) 100 return 0; 101 *keyix = 0; /* NB: use key index 0 for ucast key */ 102 } else { 103 *keyix = k - ic->ic_nw_keys; 104 } 105 *rxkeyix = IEEE80211_KEYIX_NONE; /* XXX maybe *keyix? */ 106 return 1; 107 } 108 static int 109 null_key_delete(struct ieee80211com *ic, const struct ieee80211_key *k) 110 { 111 return 1; 112 } 113 static int 114 null_key_set(struct ieee80211com *ic, const struct ieee80211_key *k, 115 const u_int8_t mac[IEEE80211_ADDR_LEN]) 116 { 117 return 1; 118 } 119 static void null_key_update(struct ieee80211com *ic) {} 120 121 /* 122 * Write-arounds for common operations. 123 */ 124 static __inline void 125 cipher_detach(struct ieee80211_key *key) 126 { 127 key->wk_cipher->ic_detach(key); 128 } 129 130 static __inline void * 131 cipher_attach(struct ieee80211com *ic, struct ieee80211_key *key) 132 { 133 return key->wk_cipher->ic_attach(ic, key); 134 } 135 136 /* 137 * Wrappers for driver key management methods. 138 */ 139 static __inline int 140 dev_key_alloc(struct ieee80211com *ic, 141 const struct ieee80211_key *key, 142 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 143 { 144 return ic->ic_crypto.cs_key_alloc(ic, key, keyix, rxkeyix); 145 } 146 147 static __inline int 148 dev_key_delete(struct ieee80211com *ic, 149 const struct ieee80211_key *key) 150 { 151 return ic->ic_crypto.cs_key_delete(ic, key); 152 } 153 154 static __inline int 155 dev_key_set(struct ieee80211com *ic, const struct ieee80211_key *key, 156 const u_int8_t mac[IEEE80211_ADDR_LEN]) 157 { 158 return ic->ic_crypto.cs_key_set(ic, key, mac); 159 } 160 161 /* 162 * Setup crypto support. 163 */ 164 void 165 ieee80211_crypto_attach(struct ieee80211com *ic) 166 { 167 struct ieee80211_crypto_state *cs = &ic->ic_crypto; 168 int i; 169 170 /* NB: we assume everything is pre-zero'd */ 171 cs->cs_def_txkey = IEEE80211_KEYIX_NONE; 172 cs->cs_max_keyix = IEEE80211_WEP_NKID; 173 ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; 174 for (i = 0; i < IEEE80211_WEP_NKID; i++) 175 ieee80211_crypto_resetkey(ic, &cs->cs_nw_keys[i], 176 IEEE80211_KEYIX_NONE); 177 /* 178 * Initialize the driver key support routines to noop entries. 179 * This is useful especially for the cipher test modules. 180 */ 181 cs->cs_key_alloc = null_key_alloc; 182 cs->cs_key_set = null_key_set; 183 cs->cs_key_delete = null_key_delete; 184 cs->cs_key_update_begin = null_key_update; 185 cs->cs_key_update_end = null_key_update; 186 } 187 188 /* 189 * Teardown crypto support. 190 */ 191 void 192 ieee80211_crypto_detach(struct ieee80211com *ic) 193 { 194 ieee80211_crypto_delglobalkeys(ic); 195 } 196 197 /* 198 * Register a crypto cipher module. 199 */ 200 void 201 ieee80211_crypto_register(const struct ieee80211_cipher *cip) 202 { 203 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 204 printf("%s: cipher %s has an invalid cipher index %u\n", 205 __func__, cip->ic_name, cip->ic_cipher); 206 return; 207 } 208 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 209 printf("%s: cipher %s registered with a different template\n", 210 __func__, cip->ic_name); 211 return; 212 } 213 ciphers[cip->ic_cipher] = cip; 214 } 215 216 /* 217 * Unregister a crypto cipher module. 218 */ 219 void 220 ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) 221 { 222 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 223 printf("%s: cipher %s has an invalid cipher index %u\n", 224 __func__, cip->ic_name, cip->ic_cipher); 225 return; 226 } 227 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 228 printf("%s: cipher %s registered with a different template\n", 229 __func__, cip->ic_name); 230 return; 231 } 232 /* NB: don't complain about not being registered */ 233 /* XXX disallow if references */ 234 ciphers[cip->ic_cipher] = NULL; 235 } 236 237 int 238 ieee80211_crypto_available(u_int cipher) 239 { 240 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; 241 } 242 243 /* XXX well-known names! */ 244 static const char *cipher_modnames[] = { 245 "wlan_wep", /* IEEE80211_CIPHER_WEP */ 246 "wlan_tkip", /* IEEE80211_CIPHER_TKIP */ 247 "wlan_aes_ocb", /* IEEE80211_CIPHER_AES_OCB */ 248 "wlan_ccmp", /* IEEE80211_CIPHER_AES_CCM */ 249 "wlan_ckip", /* IEEE80211_CIPHER_CKIP */ 250 }; 251 252 /* 253 * Establish a relationship between the specified key and cipher 254 * and, if necessary, allocate a hardware index from the driver. 255 * Note that when a fixed key index is required it must be specified 256 * and we blindly assign it w/o consulting the driver (XXX). 257 * 258 * This must be the first call applied to a key; all the other key 259 * routines assume wk_cipher is setup. 260 * 261 * Locking must be handled by the caller using: 262 * ieee80211_key_update_begin(ic); 263 * ieee80211_key_update_end(ic); 264 */ 265 int 266 ieee80211_crypto_newkey(struct ieee80211com *ic, 267 int cipher, int flags, struct ieee80211_key *key) 268 { 269 #define N(a) (sizeof(a) / sizeof(a[0])) 270 const struct ieee80211_cipher *cip; 271 ieee80211_keyix keyix, rxkeyix; 272 void *keyctx; 273 int oflags; 274 275 /* 276 * Validate cipher and set reference to cipher routines. 277 */ 278 if (cipher >= IEEE80211_CIPHER_MAX) { 279 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 280 "%s: invalid cipher %u\n", __func__, cipher); 281 ic->ic_stats.is_crypto_badcipher++; 282 return 0; 283 } 284 cip = ciphers[cipher]; 285 if (cip == NULL) { 286 /* 287 * Auto-load cipher module if we have a well-known name 288 * for it. It might be better to use string names rather 289 * than numbers and craft a module name based on the cipher 290 * name; e.g. wlan_cipher_<cipher-name>. 291 */ 292 if (cipher < N(cipher_modnames)) { 293 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 294 "%s: unregistered cipher %u, load module %s\n", 295 __func__, cipher, cipher_modnames[cipher]); 296 ieee80211_load_module(cipher_modnames[cipher]); 297 /* 298 * If cipher module loaded it should immediately 299 * call ieee80211_crypto_register which will fill 300 * in the entry in the ciphers array. 301 */ 302 cip = ciphers[cipher]; 303 } 304 if (cip == NULL) { 305 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 306 "%s: unable to load cipher %u, module %s\n", 307 __func__, cipher, 308 cipher < N(cipher_modnames) ? 309 cipher_modnames[cipher] : "<unknown>"); 310 ic->ic_stats.is_crypto_nocipher++; 311 return 0; 312 } 313 } 314 315 oflags = key->wk_flags; 316 flags &= IEEE80211_KEY_COMMON; 317 /* 318 * If the hardware does not support the cipher then 319 * fallback to a host-based implementation. 320 */ 321 if ((ic->ic_caps & (1<<cipher)) == 0) { 322 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 323 "%s: no h/w support for cipher %s, falling back to s/w\n", 324 __func__, cip->ic_name); 325 flags |= IEEE80211_KEY_SWCRYPT; 326 } 327 /* 328 * Hardware TKIP with software MIC is an important 329 * combination; we handle it by flagging each key, 330 * the cipher modules honor it. 331 */ 332 if (cipher == IEEE80211_CIPHER_TKIP && 333 (ic->ic_caps & IEEE80211_C_TKIPMIC) == 0) { 334 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 335 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 336 __func__); 337 flags |= IEEE80211_KEY_SWMIC; 338 } 339 340 /* 341 * Bind cipher to key instance. Note we do this 342 * after checking the device capabilities so the 343 * cipher module can optimize space usage based on 344 * whether or not it needs to do the cipher work. 345 */ 346 if (key->wk_cipher != cip || key->wk_flags != flags) { 347 again: 348 /* 349 * Fillin the flags so cipher modules can see s/w 350 * crypto requirements and potentially allocate 351 * different state and/or attach different method 352 * pointers. 353 * 354 * XXX this is not right when s/w crypto fallback 355 * fails and we try to restore previous state. 356 */ 357 key->wk_flags = flags; 358 keyctx = cip->ic_attach(ic, key); 359 if (keyctx == NULL) { 360 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 361 "%s: unable to attach cipher %s\n", 362 __func__, cip->ic_name); 363 key->wk_flags = oflags; /* restore old flags */ 364 ic->ic_stats.is_crypto_attachfail++; 365 return 0; 366 } 367 cipher_detach(key); 368 key->wk_cipher = cip; /* XXX refcnt? */ 369 key->wk_private = keyctx; 370 } 371 /* 372 * Commit to requested usage so driver can see the flags. 373 */ 374 key->wk_flags = flags; 375 376 /* 377 * Ask the driver for a key index if we don't have one. 378 * Note that entries in the global key table always have 379 * an index; this means it's safe to call this routine 380 * for these entries just to setup the reference to the 381 * cipher template. Note also that when using software 382 * crypto we also call the driver to give us a key index. 383 */ 384 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 385 if (!dev_key_alloc(ic, key, &keyix, &rxkeyix)) { 386 /* 387 * Driver has no room; fallback to doing crypto 388 * in the host. We change the flags and start the 389 * procedure over. If we get back here then there's 390 * no hope and we bail. Note that this can leave 391 * the key in a inconsistent state if the caller 392 * continues to use it. 393 */ 394 if ((key->wk_flags & IEEE80211_KEY_SWCRYPT) == 0) { 395 ic->ic_stats.is_crypto_swfallback++; 396 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 397 "%s: no h/w resources for cipher %s, " 398 "falling back to s/w\n", __func__, 399 cip->ic_name); 400 oflags = key->wk_flags; 401 flags |= IEEE80211_KEY_SWCRYPT; 402 if (cipher == IEEE80211_CIPHER_TKIP) 403 flags |= IEEE80211_KEY_SWMIC; 404 goto again; 405 } 406 ic->ic_stats.is_crypto_keyfail++; 407 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 408 "%s: unable to setup cipher %s\n", 409 __func__, cip->ic_name); 410 return 0; 411 } 412 key->wk_keyix = keyix; 413 key->wk_rxkeyix = rxkeyix; 414 } 415 return 1; 416 #undef N 417 } 418 419 /* 420 * Remove the key (no locking, for internal use). 421 */ 422 static int 423 _ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 424 { 425 ieee80211_keyix keyix; 426 427 IASSERT(key->wk_cipher != NULL, ("No cipher!")); 428 429 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 430 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 431 __func__, key->wk_cipher->ic_name, 432 key->wk_keyix, key->wk_flags, 433 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 434 435 keyix = key->wk_keyix; 436 if (keyix != IEEE80211_KEYIX_NONE) { 437 /* 438 * Remove hardware entry. 439 */ 440 /* XXX key cache */ 441 if (!dev_key_delete(ic, key)) { 442 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 443 "%s: driver did not delete key index %u\n", 444 __func__, keyix); 445 ic->ic_stats.is_crypto_delkey++; 446 /* XXX recovery? */ 447 } 448 } 449 cipher_detach(key); 450 memset(key, 0, sizeof(*key)); 451 ieee80211_crypto_resetkey(ic, key, IEEE80211_KEYIX_NONE); 452 return 1; 453 } 454 455 /* 456 * Remove the specified key. 457 */ 458 int 459 ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 460 { 461 int status; 462 463 ieee80211_key_update_begin(ic); 464 status = _ieee80211_crypto_delkey(ic, key); 465 ieee80211_key_update_end(ic); 466 return status; 467 } 468 469 /* 470 * Clear the global key table. 471 */ 472 void 473 ieee80211_crypto_delglobalkeys(struct ieee80211com *ic) 474 { 475 int i; 476 477 ieee80211_key_update_begin(ic); 478 for (i = 0; i < IEEE80211_WEP_NKID; i++) 479 (void) _ieee80211_crypto_delkey(ic, &ic->ic_nw_keys[i]); 480 ieee80211_key_update_end(ic); 481 } 482 483 /* 484 * Set the contents of the specified key. 485 * 486 * Locking must be handled by the caller using: 487 * ieee80211_key_update_begin(ic); 488 * ieee80211_key_update_end(ic); 489 */ 490 int 491 ieee80211_crypto_setkey(struct ieee80211com *ic, struct ieee80211_key *key, 492 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 493 { 494 const struct ieee80211_cipher *cip = key->wk_cipher; 495 496 IASSERT(cip != NULL, ("No cipher!")); 497 498 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 499 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 500 __func__, cip->ic_name, key->wk_keyix, 501 key->wk_flags, ether_sprintf(macaddr), 502 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 503 504 /* 505 * Give cipher a chance to validate key contents. 506 * XXX should happen before modifying state. 507 */ 508 if (!cip->ic_setkey(key)) { 509 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 510 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 511 __func__, cip->ic_name, key->wk_keyix, 512 key->wk_keylen, key->wk_flags); 513 ic->ic_stats.is_crypto_setkey_cipher++; 514 return 0; 515 } 516 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 517 /* XXX nothing allocated, should not happen */ 518 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 519 "%s: no key index; should not happen!\n", __func__); 520 ic->ic_stats.is_crypto_setkey_nokey++; 521 return 0; 522 } 523 return dev_key_set(ic, key, macaddr); 524 } 525 526 /* 527 * Add privacy headers appropriate for the specified key. 528 */ 529 struct ieee80211_key * 530 ieee80211_crypto_encap(struct ieee80211com *ic, 531 struct ieee80211_node *ni, struct mbuf *m) 532 { 533 struct ieee80211_key *k; 534 struct ieee80211_frame *wh; 535 const struct ieee80211_cipher *cip; 536 u_int8_t keyid; 537 538 /* 539 * Multicast traffic always uses the multicast key. 540 * Otherwise if a unicast key is set we use that and 541 * it is always key index 0. When no unicast key is 542 * set we fall back to the default transmit key. 543 */ 544 wh = mtod(m, struct ieee80211_frame *); 545 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 546 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) { 547 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE) { 548 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 549 "[%s] no default transmit key (%s) deftxkey %u\n", 550 ether_sprintf(wh->i_addr1), __func__, 551 ic->ic_def_txkey); 552 ic->ic_stats.is_tx_nodefkey++; 553 return NULL; 554 } 555 keyid = ic->ic_def_txkey; 556 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 557 } else { 558 keyid = 0; 559 k = &ni->ni_ucastkey; 560 } 561 cip = k->wk_cipher; 562 return (cip->ic_encap(k, m, keyid<<6) ? k : NULL); 563 } 564 565 /* 566 * Validate and strip privacy headers (and trailer) for a 567 * received frame that has the WEP/Privacy bit set. 568 */ 569 struct ieee80211_key * 570 ieee80211_crypto_decap(struct ieee80211com *ic, 571 struct ieee80211_node *ni, struct mbuf *m, int hdrlen) 572 { 573 #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) 574 #define IEEE80211_WEP_MINLEN \ 575 (sizeof(struct ieee80211_frame) + \ 576 IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) 577 struct ieee80211_key *k; 578 struct ieee80211_frame *wh; 579 const struct ieee80211_cipher *cip; 580 const u_int8_t *ivp; 581 u_int8_t keyid; 582 583 /* NB: this minimum size data frame could be bigger */ 584 if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { 585 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 586 "%s: WEP data frame too short, len %u\n", 587 __func__, m->m_pkthdr.len); 588 ic->ic_stats.is_rx_tooshort++; /* XXX need unique stat? */ 589 return NULL; 590 } 591 592 /* 593 * Locate the key. If unicast and there is no unicast 594 * key then we fall back to the key id in the header. 595 * This assumes unicast keys are only configured when 596 * the key id in the header is meaningless (typically 0). 597 */ 598 wh = mtod(m, struct ieee80211_frame *); 599 ivp = mtod(m, const u_int8_t *) + hdrlen; /* XXX contig */ 600 keyid = ivp[IEEE80211_WEP_IVLEN]; 601 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 602 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) 603 k = &ic->ic_nw_keys[keyid >> 6]; 604 else 605 k = &ni->ni_ucastkey; 606 607 /* 608 * Insure crypto header is contiguous for all decap work. 609 */ 610 cip = k->wk_cipher; 611 if (m->m_len < hdrlen + cip->ic_header && 612 (m = m_pullup(m, hdrlen + cip->ic_header)) == NULL) { 613 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 614 "[%s] unable to pullup %s header\n", 615 ether_sprintf(wh->i_addr2), cip->ic_name); 616 ic->ic_stats.is_rx_wepfail++; /* XXX */ 617 return 0; 618 } 619 620 return (cip->ic_decap(k, m, hdrlen) ? k : NULL); 621 #undef IEEE80211_WEP_MINLEN 622 #undef IEEE80211_WEP_HDRLEN 623 } 624