1 /* $NetBSD: ieee80211_crypto.c,v 1.9 2005/07/26 22:52:48 dyoung 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 1.10 2005/07/09 23:15:30 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto.c,v 1.9 2005/07/26 22:52:48 dyoung 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 { 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) == 0) 99 return 0; /* NB: use key index 0 for ucast key */ 100 else 101 return IEEE80211_KEYIX_NONE; 102 } 103 return k - ic->ic_nw_keys; 104 } 105 static int 106 null_key_delete(struct ieee80211com *ic, const struct ieee80211_key *k) 107 { 108 return 1; 109 } 110 static int 111 null_key_set(struct ieee80211com *ic, const struct ieee80211_key *k, 112 const u_int8_t mac[IEEE80211_ADDR_LEN]) 113 { 114 return 1; 115 } 116 static void null_key_update(struct ieee80211com *ic) {} 117 118 /* 119 * Write-arounds for common operations. 120 */ 121 static __inline void 122 cipher_detach(struct ieee80211_key *key) 123 { 124 key->wk_cipher->ic_detach(key); 125 } 126 127 static __inline void * 128 cipher_attach(struct ieee80211com *ic, struct ieee80211_key *key) 129 { 130 return key->wk_cipher->ic_attach(ic, key); 131 } 132 133 /* 134 * Wrappers for driver key management methods. 135 */ 136 static __inline int 137 dev_key_alloc(struct ieee80211com *ic, 138 const struct ieee80211_key *key) 139 { 140 return ic->ic_crypto.cs_key_alloc(ic, key); 141 } 142 143 static __inline int 144 dev_key_delete(struct ieee80211com *ic, 145 const struct ieee80211_key *key) 146 { 147 return ic->ic_crypto.cs_key_delete(ic, key); 148 } 149 150 static __inline int 151 dev_key_set(struct ieee80211com *ic, const struct ieee80211_key *key, 152 const u_int8_t mac[IEEE80211_ADDR_LEN]) 153 { 154 return ic->ic_crypto.cs_key_set(ic, key, mac); 155 } 156 157 /* 158 * Setup crypto support. 159 */ 160 void 161 ieee80211_crypto_attach(struct ieee80211com *ic) 162 { 163 struct ieee80211_crypto_state *cs = &ic->ic_crypto; 164 int i; 165 166 /* NB: we assume everything is pre-zero'd */ 167 cs->cs_def_txkey = IEEE80211_KEYIX_NONE; 168 ciphers[IEEE80211_CIPHER_AES_CCM] = &ieee80211_cipher_ccmp; 169 ciphers[IEEE80211_CIPHER_TKIP] = &ieee80211_cipher_tkip; 170 ciphers[IEEE80211_CIPHER_WEP] = &ieee80211_cipher_wep; 171 ciphers[IEEE80211_CIPHER_NONE] = &ieee80211_cipher_none; 172 173 for (i = 0; i < IEEE80211_WEP_NKID; i++) 174 ieee80211_crypto_resetkey(ic, &cs->cs_nw_keys[i], 175 IEEE80211_KEYIX_NONE); 176 /* 177 * Initialize the driver key support routines to noop entries. 178 * This is useful especially for the cipher test modules. 179 */ 180 cs->cs_key_alloc = null_key_alloc; 181 cs->cs_key_set = null_key_set; 182 cs->cs_key_delete = null_key_delete; 183 cs->cs_key_update_begin = null_key_update; 184 cs->cs_key_update_end = null_key_update; 185 } 186 187 /* 188 * Teardown crypto support. 189 */ 190 void 191 ieee80211_crypto_detach(struct ieee80211com *ic) 192 { 193 ieee80211_crypto_delglobalkeys(ic); 194 } 195 196 /* 197 * Register a crypto cipher module. 198 */ 199 void 200 ieee80211_crypto_register(const struct ieee80211_cipher *cip) 201 { 202 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 203 printf("%s: cipher %s has an invalid cipher index %u\n", 204 __func__, cip->ic_name, cip->ic_cipher); 205 return; 206 } 207 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 208 printf("%s: cipher %s registered with a different template\n", 209 __func__, cip->ic_name); 210 return; 211 } 212 ciphers[cip->ic_cipher] = cip; 213 } 214 215 /* 216 * Unregister a crypto cipher module. 217 */ 218 void 219 ieee80211_crypto_unregister(const struct ieee80211_cipher *cip) 220 { 221 if (cip->ic_cipher >= IEEE80211_CIPHER_MAX) { 222 printf("%s: cipher %s has an invalid cipher index %u\n", 223 __func__, cip->ic_name, cip->ic_cipher); 224 return; 225 } 226 if (ciphers[cip->ic_cipher] != NULL && ciphers[cip->ic_cipher] != cip) { 227 printf("%s: cipher %s registered with a different template\n", 228 __func__, cip->ic_name); 229 return; 230 } 231 /* NB: don't complain about not being registered */ 232 /* XXX disallow if references */ 233 ciphers[cip->ic_cipher] = NULL; 234 } 235 236 int 237 ieee80211_crypto_available(u_int cipher) 238 { 239 return cipher < IEEE80211_CIPHER_MAX && ciphers[cipher] != NULL; 240 } 241 242 /* XXX well-known names! */ 243 static const char *cipher_modnames[] = { 244 "wlan_wep", /* IEEE80211_CIPHER_WEP */ 245 "wlan_tkip", /* IEEE80211_CIPHER_TKIP */ 246 "wlan_aes_ocb", /* IEEE80211_CIPHER_AES_OCB */ 247 "wlan_ccmp", /* IEEE80211_CIPHER_AES_CCM */ 248 "wlan_ckip", /* IEEE80211_CIPHER_CKIP */ 249 }; 250 251 /* 252 * Establish a relationship between the specified key and cipher 253 * and, if necessary, allocate a hardware index from the driver. 254 * Note that when a fixed key index is required it must be specified 255 * and we blindly assign it w/o consulting the driver (XXX). 256 * 257 * This must be the first call applied to a key; all the other key 258 * routines assume wk_cipher is setup. 259 * 260 * Locking must be handled by the caller using: 261 * ieee80211_key_update_begin(ic); 262 * ieee80211_key_update_end(ic); 263 */ 264 int 265 ieee80211_crypto_newkey(struct ieee80211com *ic, 266 int cipher, int flags, struct ieee80211_key *key) 267 { 268 #define N(a) (sizeof(a) / sizeof(a[0])) 269 const struct ieee80211_cipher *cip; 270 void *keyctx; 271 int oflags; 272 273 /* 274 * Validate cipher and set reference to cipher routines. 275 */ 276 if (cipher >= IEEE80211_CIPHER_MAX) { 277 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 278 "%s: invalid cipher %u\n", __func__, cipher); 279 ic->ic_stats.is_crypto_badcipher++; 280 return 0; 281 } 282 cip = ciphers[cipher]; 283 if (cip == NULL) { 284 /* 285 * Auto-load cipher module if we have a well-known name 286 * for it. It might be better to use string names rather 287 * than numbers and craft a module name based on the cipher 288 * name; e.g. wlan_cipher_<cipher-name>. 289 */ 290 if (cipher < N(cipher_modnames)) { 291 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 292 "%s: unregistered cipher %u, load module %s\n", 293 __func__, cipher, cipher_modnames[cipher]); 294 ieee80211_load_module(cipher_modnames[cipher]); 295 /* 296 * If cipher module loaded it should immediately 297 * call ieee80211_crypto_register which will fill 298 * in the entry in the ciphers array. 299 */ 300 cip = ciphers[cipher]; 301 } 302 if (cip == NULL) { 303 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 304 "%s: unable to load cipher %u, module %s\n", 305 __func__, cipher, 306 cipher < N(cipher_modnames) ? 307 cipher_modnames[cipher] : "<unknown>"); 308 ic->ic_stats.is_crypto_nocipher++; 309 return 0; 310 } 311 } 312 313 oflags = key->wk_flags; 314 flags &= IEEE80211_KEY_COMMON; 315 /* 316 * If the hardware does not support the cipher then 317 * fallback to a host-based implementation. 318 */ 319 if ((ic->ic_caps & (1<<cipher)) == 0) { 320 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 321 "%s: no h/w support for cipher %s, falling back to s/w\n", 322 __func__, cip->ic_name); 323 flags |= IEEE80211_KEY_SWCRYPT; 324 } 325 /* 326 * Hardware TKIP with software MIC is an important 327 * combination; we handle it by flagging each key, 328 * the cipher modules honor it. 329 */ 330 if (cipher == IEEE80211_CIPHER_TKIP && 331 (ic->ic_caps & IEEE80211_C_TKIPMIC) == 0) { 332 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 333 "%s: no h/w support for TKIP MIC, falling back to s/w\n", 334 __func__); 335 flags |= IEEE80211_KEY_SWMIC; 336 } 337 338 /* 339 * Bind cipher to key instance. Note we do this 340 * after checking the device capabilities so the 341 * cipher module can optimize space usage based on 342 * whether or not it needs to do the cipher work. 343 */ 344 if (key->wk_cipher != cip || key->wk_flags != flags) { 345 again: 346 /* 347 * Fillin the flags so cipher modules can see s/w 348 * crypto requirements and potentially allocate 349 * different state and/or attach different method 350 * pointers. 351 * 352 * XXX this is not right when s/w crypto fallback 353 * fails and we try to restore previous state. 354 */ 355 key->wk_flags = flags; 356 keyctx = cip->ic_attach(ic, key); 357 if (keyctx == NULL) { 358 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 359 "%s: unable to attach cipher %s\n", 360 __func__, cip->ic_name); 361 key->wk_flags = oflags; /* restore old flags */ 362 ic->ic_stats.is_crypto_attachfail++; 363 return 0; 364 } 365 cipher_detach(key); 366 key->wk_cipher = cip; /* XXX refcnt? */ 367 key->wk_private = keyctx; 368 } 369 /* 370 * Commit to requested usage so driver can see the flags. 371 */ 372 key->wk_flags = flags; 373 374 /* 375 * Ask the driver for a key index if we don't have one. 376 * Note that entries in the global key table always have 377 * an index; this means it's safe to call this routine 378 * for these entries just to setup the reference to the 379 * cipher template. Note also that when using software 380 * crypto we also call the driver to give us a key index. 381 */ 382 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 383 key->wk_keyix = dev_key_alloc(ic, key); 384 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 385 /* 386 * Driver has no room; fallback to doing crypto 387 * in the host. We change the flags and start the 388 * procedure over. If we get back here then there's 389 * no hope and we bail. Note that this can leave 390 * the key in a inconsistent state if the caller 391 * continues to use it. 392 */ 393 if ((key->wk_flags & IEEE80211_KEY_SWCRYPT) == 0) { 394 ic->ic_stats.is_crypto_swfallback++; 395 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 396 "%s: no h/w resources for cipher %s, " 397 "falling back to s/w\n", __func__, 398 cip->ic_name); 399 oflags = key->wk_flags; 400 flags |= IEEE80211_KEY_SWCRYPT; 401 if (cipher == IEEE80211_CIPHER_TKIP) 402 flags |= IEEE80211_KEY_SWMIC; 403 goto again; 404 } 405 ic->ic_stats.is_crypto_keyfail++; 406 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 407 "%s: unable to setup cipher %s\n", 408 __func__, cip->ic_name); 409 return 0; 410 } 411 } 412 return 1; 413 #undef N 414 } 415 416 /* 417 * Remove the key (no locking, for internal use). 418 */ 419 static int 420 _ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 421 { 422 u_int16_t keyix; 423 424 IASSERT(key->wk_cipher != NULL, ("No cipher!")); 425 426 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 427 "%s: %s keyix %u flags 0x%x rsc %ju tsc %ju len %u\n", 428 __func__, key->wk_cipher->ic_name, 429 key->wk_keyix, key->wk_flags, 430 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 431 432 keyix = key->wk_keyix; 433 if (keyix != IEEE80211_KEYIX_NONE) { 434 /* 435 * Remove hardware entry. 436 */ 437 /* XXX key cache */ 438 if (!dev_key_delete(ic, key)) { 439 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 440 "%s: driver did not delete key index %u\n", 441 __func__, keyix); 442 ic->ic_stats.is_crypto_delkey++; 443 /* XXX recovery? */ 444 } 445 } 446 cipher_detach(key); 447 memset(key, 0, sizeof(*key)); 448 ieee80211_crypto_resetkey(ic, key, IEEE80211_KEYIX_NONE); 449 return 1; 450 } 451 452 /* 453 * Remove the specified key. 454 */ 455 int 456 ieee80211_crypto_delkey(struct ieee80211com *ic, struct ieee80211_key *key) 457 { 458 int status; 459 460 ieee80211_key_update_begin(ic); 461 status = _ieee80211_crypto_delkey(ic, key); 462 ieee80211_key_update_end(ic); 463 return status; 464 } 465 466 /* 467 * Clear the global key table. 468 */ 469 void 470 ieee80211_crypto_delglobalkeys(struct ieee80211com *ic) 471 { 472 int i; 473 474 ieee80211_key_update_begin(ic); 475 for (i = 0; i < IEEE80211_WEP_NKID; i++) 476 (void) _ieee80211_crypto_delkey(ic, &ic->ic_nw_keys[i]); 477 ieee80211_key_update_end(ic); 478 } 479 480 /* 481 * Set the contents of the specified key. 482 * 483 * Locking must be handled by the caller using: 484 * ieee80211_key_update_begin(ic); 485 * ieee80211_key_update_end(ic); 486 */ 487 int 488 ieee80211_crypto_setkey(struct ieee80211com *ic, struct ieee80211_key *key, 489 const u_int8_t macaddr[IEEE80211_ADDR_LEN]) 490 { 491 const struct ieee80211_cipher *cip = key->wk_cipher; 492 493 IASSERT(cip != NULL, ("No cipher!")); 494 495 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 496 "%s: %s keyix %u flags 0x%x mac %s rsc %ju tsc %ju len %u\n", 497 __func__, cip->ic_name, key->wk_keyix, 498 key->wk_flags, ether_sprintf(macaddr), 499 key->wk_keyrsc, key->wk_keytsc, key->wk_keylen); 500 501 /* 502 * Give cipher a chance to validate key contents. 503 * XXX should happen before modifying state. 504 */ 505 if (!cip->ic_setkey(key)) { 506 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 507 "%s: cipher %s rejected key index %u len %u flags 0x%x\n", 508 __func__, cip->ic_name, key->wk_keyix, 509 key->wk_keylen, key->wk_flags); 510 ic->ic_stats.is_crypto_setkey_cipher++; 511 return 0; 512 } 513 if (key->wk_keyix == IEEE80211_KEYIX_NONE) { 514 /* XXX nothing allocated, should not happen */ 515 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 516 "%s: no key index; should not happen!\n", __func__); 517 ic->ic_stats.is_crypto_setkey_nokey++; 518 return 0; 519 } 520 return dev_key_set(ic, key, macaddr); 521 } 522 523 /* 524 * Add privacy headers appropriate for the specified key. 525 */ 526 struct ieee80211_key * 527 ieee80211_crypto_encap(struct ieee80211com *ic, 528 struct ieee80211_node *ni, struct mbuf *m) 529 { 530 struct ieee80211_key *k; 531 struct ieee80211_frame *wh; 532 const struct ieee80211_cipher *cip; 533 u_int8_t keyid; 534 535 /* 536 * Multicast traffic always uses the multicast key. 537 * Otherwise if a unicast key is set we use that and 538 * it is always key index 0. When no unicast key is 539 * set we fall back to the default transmit key. 540 */ 541 wh = mtod(m, struct ieee80211_frame *); 542 if (IEEE80211_IS_MULTICAST(wh->i_addr1) || 543 ni->ni_ucastkey.wk_cipher == &ieee80211_cipher_none) { 544 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE) { 545 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 546 "[%s] no default transmit key (%s) deftxkey %u\n", 547 ether_sprintf(wh->i_addr1), __func__, 548 ic->ic_def_txkey); 549 ic->ic_stats.is_tx_nodefkey++; 550 goto bad; 551 } 552 keyid = ic->ic_def_txkey; 553 k = &ic->ic_nw_keys[ic->ic_def_txkey]; 554 } else { 555 keyid = 0; 556 k = &ni->ni_ucastkey; 557 } 558 cip = k->wk_cipher; 559 if (cip->ic_encap(k, m, keyid<<6)) 560 return k; 561 bad: 562 return 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) + ETHER_HDR_LEN + \ 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