1 /* $NetBSD: ieee80211_crypto.c,v 1.14 2006/11/16 01:33:40 christos 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 1.14 2006/11/16 01:33:40 christos 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, 110 const struct ieee80211_key *k) 111 { 112 return 1; 113 } 114 static int 115 null_key_set(struct ieee80211com *ic, 116 const struct ieee80211_key *k, 117 const u_int8_t mac[IEEE80211_ADDR_LEN]) 118 { 119 return 1; 120 } 121 static void null_key_update(struct ieee80211com *ic) {} 122 123 /* 124 * Write-arounds for common operations. 125 */ 126 static __inline void 127 cipher_detach(struct ieee80211_key *key) 128 { 129 key->wk_cipher->ic_detach(key); 130 } 131 132 static __inline void * 133 cipher_attach(struct ieee80211com *ic, struct ieee80211_key *key) 134 { 135 return key->wk_cipher->ic_attach(ic, key); 136 } 137 138 /* 139 * Wrappers for driver key management methods. 140 */ 141 static __inline int 142 dev_key_alloc(struct ieee80211com *ic, 143 const struct ieee80211_key *key, 144 ieee80211_keyix *keyix, ieee80211_keyix *rxkeyix) 145 { 146 return ic->ic_crypto.cs_key_alloc(ic, key, keyix, rxkeyix); 147 } 148 149 static __inline int 150 dev_key_delete(struct ieee80211com *ic, 151 const struct ieee80211_key *key) 152 { 153 return ic->ic_crypto.cs_key_delete(ic, key); 154 } 155 156 static __inline int 157 dev_key_set(struct ieee80211com *ic, const struct ieee80211_key *key, 158 const u_int8_t mac[IEEE80211_ADDR_LEN]) 159 { 160 return ic->ic_crypto.cs_key_set(ic, key, mac); 161 } 162 163 /* 164 * Setup crypto support. 165 */ 166 void 167 ieee80211_crypto_attach(struct ieee80211com *ic) 168 { 169 struct ieee80211_crypto_state *cs = &ic->ic_crypto; 170 int i; 171 172 /* NB: we assume everything is pre-zero'd */ 173 cs->cs_def_txkey = IEEE80211_KEYIX_NONE; 174 cs->cs_max_keyix = IEEE80211_WEP_NKID; 175 ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; 176 for (i = 0; i < IEEE80211_WEP_NKID; i++) 177 ieee80211_crypto_resetkey(ic, &cs->cs_nw_keys[i], 178 IEEE80211_KEYIX_NONE); 179 /* 180 * Initialize the driver key support routines to noop entries. 181 * This is useful especially for the cipher test modules. 182 */ 183 cs->cs_key_alloc = null_key_alloc; 184 cs->cs_key_set = null_key_set; 185 cs->cs_key_delete = null_key_delete; 186 cs->cs_key_update_begin = null_key_update; 187 cs->cs_key_update_end = null_key_update; 188 } 189 190 /* 191 * Teardown crypto support. 192 */ 193 void 194 ieee80211_crypto_detach(struct ieee80211com *ic) 195 { 196 ieee80211_crypto_delglobalkeys(ic); 197 } 198 199 /* 200 * Register a crypto cipher module. 201 */ 202 void 203 ieee80211_crypto_register(const struct ieee80211_cipher *cip) 204 { 205 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 206 printf("%s: cipher %s has an invalid cipher index %u\n", 207 __func__, cip->ic_name, cip->ic_cipher); 208 return; 209 } 210 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 211 printf("%s: cipher %s registered with a different template\n", 212 __func__, cip->ic_name); 213 return; 214 } 215 ciphers[cip->ic_cipher] = cip; 216 } 217 218 /* 219 * Unregister a crypto cipher module. 220 */ 221 void 222 ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) 223 { 224 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 225 printf("%s: cipher %s has an invalid cipher index %u\n", 226 __func__, cip->ic_name, cip->ic_cipher); 227 return; 228 } 229 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 230 printf("%s: cipher %s registered with a different template\n", 231 __func__, cip->ic_name); 232 return; 233 } 234 /* NB: don't complain about not being registered */ 235 /* XXX disallow if references */ 236 ciphers[cip->ic_cipher] = NULL; 237 } 238 239 int 240 ieee80211_crypto_available(u_int cipher) 241 { 242 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; 243 } 244 245 /* XXX well-known names! */ 246 static const char *cipher_modnames[] = { 247 "wlan_wep", /* IEEE80211_CIPHER_WEP */ 248 "wlan_tkip", /* IEEE80211_CIPHER_TKIP */ 249 "wlan_aes_ocb", /* IEEE80211_CIPHER_AES_OCB */ 250 "wlan_ccmp", /* IEEE80211_CIPHER_AES_CCM */ 251 "wlan_ckip", /* IEEE80211_CIPHER_CKIP */ 252 }; 253 254 /* 255 * Establish a relationship between the specified key and cipher 256 * and, if necessary, allocate a hardware index from the driver. 257 * Note that when a fixed key index is required it must be specified 258 * and we blindly assign it w/o consulting the driver (XXX). 259 * 260 * This must be the first call applied to a key; all the other key 261 * routines assume wk_cipher is setup. 262 * 263 * Locking must be handled by the caller using: 264 * ieee80211_key_update_begin(ic); 265 * ieee80211_key_update_end(ic); 266 */ 267 int 268 ieee80211_crypto_newkey(struct ieee80211com *ic, 269 int cipher, int flags, struct ieee80211_key *key) 270 { 271 #define N(a) (sizeof(a) / sizeof(a[0])) 272 const struct ieee80211_cipher *cip; 273 ieee80211_keyix keyix, rxkeyix; 274 void *keyctx; 275 int oflags; 276 277 /* 278 * Validate cipher and set reference to cipher routines. 279 */ 280 if (cipher >= IEEE80211_CIPHER_MAX) { 281 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 282 "%s: invalid cipher %u\n", __func__, cipher); 283 ic->ic_stats.is_crypto_badcipher++; 284 return 0; 285 } 286 cip = ciphers[cipher]; 287 if (cip == NULL) { 288 /* 289 * Auto-load cipher module if we have a well-known name 290 * for it. It might be better to use string names rather 291 * than numbers and craft a module name based on the cipher 292 * name; e.g. wlan_cipher_<cipher-name>. 293 */ 294 if (cipher < N(cipher_modnames)) { 295 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 296 "%s: unregistered cipher %u, load module %s\n", 297 __func__, cipher, cipher_modnames[cipher]); 298 ieee80211_load_module(cipher_modnames[cipher]); 299 /* 300 * If cipher module loaded it should immediately 301 * call ieee80211_crypto_register which will fill 302 * in the entry in the ciphers array. 303 */ 304 cip = ciphers[cipher]; 305 } 306 if (cip == NULL) { 307 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 308 "%s: unable to load cipher %u, module %s\n", 309 __func__, cipher, 310 cipher < N(cipher_modnames) ? 311 cipher_modnames[cipher] : "<unknown>"); 312 ic->ic_stats.is_crypto_nocipher++; 313 return 0; 314 } 315 } 316 317 oflags = key->wk_flags; 318 flags &= IEEE80211_KEY_COMMON; 319 /* 320 * If the hardware does not support the cipher then 321 * fallback to a host-based implementation. 322 */ 323 if ((ic->ic_caps & (1<<cipher)) == 0) { 324 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 325 "%s: no h/w support for cipher %s, falling back to s/w\n", 326 __func__, cip->ic_name); 327 flags |= IEEE80211_KEY_SWCRYPT; 328 } 329 /* 330 * Hardware TKIP with software MIC is an important 331 * combination; we handle it by flagging each key, 332 * the cipher modules honor it. 333 */ 334 if (cipher == IEEE80211_CIPHER_TKIP && 335 (ic->ic_caps & IEEE80211_C_TKIPMIC) == 0) { 336 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 337 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 338 __func__); 339 flags |= IEEE80211_KEY_SWMIC; 340 } 341 342 /* 343 * Bind cipher to key instance. Note we do this 344 * after checking the device capabilities so the 345 * cipher module can optimize space usage based on 346 * whether or not it needs to do the cipher work. 347 */ 348 if (key->wk_cipher != cip || key->wk_flags != flags) { 349 again: 350 /* 351 * Fillin the flags so cipher modules can see s/w 352 * crypto requirements and potentially allocate 353 * different state and/or attach different method 354 * pointers. 355 * 356 * XXX this is not right when s/w crypto fallback 357 * fails and we try to restore previous state. 358 */ 359 key->wk_flags = flags; 360 keyctx = cip->ic_attach(ic, key); 361 if (keyctx == NULL) { 362 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 363 "%s: unable to attach cipher %s\n", 364 __func__, cip->ic_name); 365 key->wk_flags = oflags; /* restore old flags */ 366 ic->ic_stats.is_crypto_attachfail++; 367 return 0; 368 } 369 cipher_detach(key); 370 key->wk_cipher = cip; /* XXX refcnt? */ 371 key->wk_private = keyctx; 372 } 373 /* 374 * Commit to requested usage so driver can see the flags. 375 */ 376 key->wk_flags = flags; 377 378 /* 379 * Ask the driver for a key index if we don't have one. 380 * Note that entries in the global key table always have 381 * an index; this means it's safe to call this routine 382 * for these entries just to setup the reference to the 383 * cipher template. Note also that when using software 384 * crypto we also call the driver to give us a key index. 385 */ 386 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 387 if (!dev_key_alloc(ic, key, &keyix, &rxkeyix)) { 388 /* 389 * Driver has no room; fallback to doing crypto 390 * in the host. We change the flags and start the 391 * procedure over. If we get back here then there's 392 * no hope and we bail. Note that this can leave 393 * the key in a inconsistent state if the caller 394 * continues to use it. 395 */ 396 if ((key->wk_flags & IEEE80211_KEY_SWCRYPT) == 0) { 397 ic->ic_stats.is_crypto_swfallback++; 398 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 399 "%s: no h/w resources for cipher %s, " 400 "falling back to s/w\n", __func__, 401 cip->ic_name); 402 oflags = key->wk_flags; 403 flags |= IEEE80211_KEY_SWCRYPT; 404 if (cipher == IEEE80211_CIPHER_TKIP) 405 flags |= IEEE80211_KEY_SWMIC; 406 goto again; 407 } 408 ic->ic_stats.is_crypto_keyfail++; 409 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 410 "%s: unable to setup cipher %s\n", 411 __func__, cip->ic_name); 412 return 0; 413 } 414 key->wk_keyix = keyix; 415 key->wk_rxkeyix = rxkeyix; 416 } 417 return 1; 418 #undef N 419 } 420 421 /* 422 * Remove the key (no locking, for internal use). 423 */ 424 static int 425 _ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 426 { 427 ieee80211_keyix keyix; 428 429 IASSERT(key->wk_cipher != NULL, ("No cipher!")); 430 431 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 432 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 433 __func__, key->wk_cipher->ic_name, 434 key->wk_keyix, key->wk_flags, 435 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 436 437 keyix = key->wk_keyix; 438 if (keyix != IEEE80211_KEYIX_NONE) { 439 /* 440 * Remove hardware entry. 441 */ 442 /* XXX key cache */ 443 if (!dev_key_delete(ic, key)) { 444 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 445 "%s: driver did not delete key index %u\n", 446 __func__, keyix); 447 ic->ic_stats.is_crypto_delkey++; 448 /* XXX recovery? */ 449 } 450 } 451 cipher_detach(key); 452 memset(key, 0, sizeof(*key)); 453 ieee80211_crypto_resetkey(ic, key, IEEE80211_KEYIX_NONE); 454 return 1; 455 } 456 457 /* 458 * Remove the specified key. 459 */ 460 int 461 ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 462 { 463 int status; 464 465 ieee80211_key_update_begin(ic); 466 status = _ieee80211_crypto_delkey(ic, key); 467 ieee80211_key_update_end(ic); 468 return status; 469 } 470 471 /* 472 * Clear the global key table. 473 */ 474 void 475 ieee80211_crypto_delglobalkeys(struct ieee80211com *ic) 476 { 477 int i; 478 479 ieee80211_key_update_begin(ic); 480 for (i = 0; i < IEEE80211_WEP_NKID; i++) 481 (void) _ieee80211_crypto_delkey(ic, &ic->ic_nw_keys[i]); 482 ieee80211_key_update_end(ic); 483 } 484 485 /* 486 * Set the contents of the specified key. 487 * 488 * Locking must be handled by the caller using: 489 * ieee80211_key_update_begin(ic); 490 * ieee80211_key_update_end(ic); 491 */ 492 int 493 ieee80211_crypto_setkey(struct ieee80211com *ic, struct ieee80211_key *key, 494 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 495 { 496 const struct ieee80211_cipher *cip = key->wk_cipher; 497 498 IASSERT(cip != NULL, ("No cipher!")); 499 500 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 501 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 502 __func__, cip->ic_name, key->wk_keyix, 503 key->wk_flags, ether_sprintf(macaddr), 504 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 505 506 /* 507 * Give cipher a chance to validate key contents. 508 * XXX should happen before modifying state. 509 */ 510 if (!cip->ic_setkey(key)) { 511 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 512 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 513 __func__, cip->ic_name, key->wk_keyix, 514 key->wk_keylen, key->wk_flags); 515 ic->ic_stats.is_crypto_setkey_cipher++; 516 return 0; 517 } 518 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 519 /* XXX nothing allocated, should not happen */ 520 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 521 "%s: no key index; should not happen!\n", __func__); 522 ic->ic_stats.is_crypto_setkey_nokey++; 523 return 0; 524 } 525 return dev_key_set(ic, key, macaddr); 526 } 527 528 /* 529 * Add privacy headers appropriate for the specified key. 530 */ 531 struct ieee80211_key * 532 ieee80211_crypto_encap(struct ieee80211com *ic, 533 struct ieee80211_node *ni, struct mbuf *m) 534 { 535 struct ieee80211_key *k; 536 struct ieee80211_frame *wh; 537 const struct ieee80211_cipher *cip; 538 u_int8_t keyid; 539 540 /* 541 * Multicast traffic always uses the multicast key. 542 * Otherwise if a unicast key is set we use that and 543 * it is always key index 0. When no unicast key is 544 * set we fall back to the default transmit key. 545 */ 546 wh = mtod(m, struct ieee80211_frame *); 547 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 548 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) { 549 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE) { 550 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 551 "[%s] no default transmit key (%s) deftxkey %u\n", 552 ether_sprintf(wh->i_addr1), __func__, 553 ic->ic_def_txkey); 554 ic->ic_stats.is_tx_nodefkey++; 555 return NULL; 556 } 557 keyid = ic->ic_def_txkey; 558 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 559 } else { 560 keyid = 0; 561 k = &ni->ni_ucastkey; 562 } 563 cip = k->wk_cipher; 564 return (cip->ic_encap(k, m, keyid<<6) ? k : NULL); 565 } 566 567 /* 568 * Validate and strip privacy headers (and trailer) for a 569 * received frame that has the WEP/Privacy bit set. 570 */ 571 struct ieee80211_key * 572 ieee80211_crypto_decap(struct ieee80211com *ic, 573 struct ieee80211_node *ni, struct mbuf *m, int hdrlen) 574 { 575 #define IEEE80211_WEP_HDRLEN (IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN) 576 #define IEEE80211_WEP_MINLEN \ 577 (sizeof(struct ieee80211_frame) + \ 578 IEEE80211_WEP_HDRLEN + IEEE80211_WEP_CRCLEN) 579 struct ieee80211_key *k; 580 struct ieee80211_frame *wh; 581 const struct ieee80211_cipher *cip; 582 u_int8_t keyid; 583 584 /* NB: this minimum size data frame could be bigger */ 585 if (m->m_pkthdr.len < IEEE80211_WEP_MINLEN) { 586 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 587 "%s: WEP data frame too short, len %u\n", 588 __func__, m->m_pkthdr.len); 589 ic->ic_stats.is_rx_tooshort++; /* XXX need unique stat? */ 590 return NULL; 591 } 592 593 /* 594 * Locate the key. If unicast and there is no unicast 595 * key then we fall back to the key id in the header. 596 * This assumes unicast keys are only configured when 597 * the key id in the header is meaningless (typically 0). 598 */ 599 wh = mtod(m, struct ieee80211_frame *); 600 m_copydata(m, hdrlen + IEEE80211_WEP_IVLEN, sizeof(keyid), &keyid); 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 NULL; 618 } 619 620 return (cip->ic_decap(k, m, hdrlen) ? k : NULL); 621 #undef IEEE80211_WEP_MINLEN 622 #undef IEEE80211_WEP_HDRLEN 623 } 624