1 /* $NetBSD: ieee80211_output.c,v 1.37 2005/08/21 00:07:57 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_output.c,v 1.26 2005/07/06 01:55:17 sam Exp $"); 37 #endif 38 #ifdef __NetBSD__ 39 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.37 2005/08/21 00:07:57 dyoung Exp $"); 40 #endif 41 42 #include "opt_inet.h" 43 44 #ifdef __NetBSD__ 45 #include "bpfilter.h" 46 #endif /* __NetBSD__ */ 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/kernel.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_llc.h> 59 #include <net/if_media.h> 60 #include <net/if_arp.h> 61 #include <net/if_ether.h> 62 #include <net/if_llc.h> 63 #include <net/if_vlanvar.h> 64 65 #include <net80211/ieee80211_netbsd.h> 66 #include <net80211/ieee80211_var.h> 67 68 #if NBPFILTER > 0 69 #include <net/bpf.h> 70 #endif 71 72 #ifdef INET 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/in_var.h> 76 #include <netinet/ip.h> 77 #include <net/if_ether.h> 78 #endif 79 80 #ifdef IEEE80211_DEBUG 81 /* 82 * Decide if an outbound management frame should be 83 * printed when debugging is enabled. This filters some 84 * of the less interesting frames that come frequently 85 * (e.g. beacons). 86 */ 87 static __inline int 88 doprint(struct ieee80211com *ic, int subtype) 89 { 90 switch (subtype) { 91 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 92 return (ic->ic_opmode == IEEE80211_M_IBSS); 93 } 94 return 1; 95 } 96 #endif 97 98 /* 99 * Send a management frame to the specified node. The node pointer 100 * must have a reference as the pointer will be passed to the driver 101 * and potentially held for a long time. If the frame is successfully 102 * dispatched to the driver, then it is responsible for freeing the 103 * reference (and potentially free'ing up any associated storage). 104 */ 105 static int 106 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 107 struct mbuf *m, int type) 108 { 109 struct ifnet *ifp = ic->ic_ifp; 110 struct ieee80211_frame *wh; 111 112 IASSERT(ni != NULL, ("null node")); 113 114 /* 115 * Yech, hack alert! We want to pass the node down to the 116 * driver's start routine. If we don't do so then the start 117 * routine must immediately look it up again and that can 118 * cause a lock order reversal if, for example, this frame 119 * is being sent because the station is being timedout and 120 * the frame being sent is a DEAUTH message. We could stick 121 * this in an m_tag and tack that on to the mbuf. However 122 * that's rather expensive to do for every frame so instead 123 * we stuff it in the rcvif field since outbound frames do 124 * not (presently) use this. 125 */ 126 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 127 if (m == NULL) 128 return ENOMEM; 129 #ifdef __FreeBSD__ 130 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 131 #endif 132 m->m_pkthdr.rcvif = (void *)ni; 133 134 wh = mtod(m, struct ieee80211_frame *); 135 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | type; 136 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 137 *(u_int16_t *)wh->i_dur = 0; 138 *(u_int16_t *)wh->i_seq = 139 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 140 ni->ni_txseqs[0]++; 141 /* 142 * Hack. When sending PROBE_REQ frames while scanning we 143 * explicitly force a broadcast rather than (as before) clobber 144 * ni_macaddr and ni_bssid. This is stopgap, we need a way 145 * to communicate this directly rather than do something 146 * implicit based on surrounding state. 147 */ 148 if (type == IEEE80211_FC0_SUBTYPE_PROBE_REQ && 149 (ic->ic_flags & IEEE80211_F_SCAN)) { 150 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 151 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 152 IEEE80211_ADDR_COPY(wh->i_addr3, ifp->if_broadcastaddr); 153 } else { 154 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 155 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 156 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 157 } 158 159 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 160 m->m_flags &= ~M_LINK0; 161 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 162 "[%s] encrypting frame (%s)\n", 163 ether_sprintf(wh->i_addr1), __func__); 164 wh->i_fc[1] |= IEEE80211_FC1_WEP; 165 } 166 #ifdef IEEE80211_DEBUG 167 /* avoid printing too many frames */ 168 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 169 ieee80211_msg_dumppkts(ic)) { 170 printf("[%s] send %s on channel %u\n", 171 ether_sprintf(wh->i_addr1), 172 ieee80211_mgt_subtype_name[ 173 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 174 IEEE80211_FC0_SUBTYPE_SHIFT], 175 ieee80211_chan2ieee(ic, ni->ni_chan)); 176 } 177 #endif 178 IEEE80211_NODE_STAT(ni, tx_mgmt); 179 IF_ENQUEUE(&ic->ic_mgtq, m); 180 ifp->if_timer = 1; 181 (*ifp->if_start)(ifp); 182 return 0; 183 } 184 185 /* 186 * Send a null data frame to the specified node. 187 */ 188 int 189 ieee80211_send_nulldata(struct ieee80211com *ic, struct ieee80211_node *ni) 190 { 191 struct ifnet *ifp = ic->ic_ifp; 192 struct mbuf *m; 193 struct ieee80211_frame *wh; 194 195 MGETHDR(m, M_NOWAIT, MT_HEADER); 196 if (m == NULL) { 197 /* XXX debug msg */ 198 ic->ic_stats.is_tx_nobuf++; 199 return ENOMEM; 200 } 201 m->m_pkthdr.rcvif = (void *) ieee80211_ref_node(ni); 202 203 wh = mtod(m, struct ieee80211_frame *); 204 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA | 205 IEEE80211_FC0_SUBTYPE_NODATA; 206 *(u_int16_t *)wh->i_dur = 0; 207 *(u_int16_t *)wh->i_seq = 208 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 209 ni->ni_txseqs[0]++; 210 211 /* XXX WDS */ 212 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 213 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 214 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 215 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_myaddr); 216 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 217 218 IEEE80211_NODE_STAT(ni, tx_data); 219 220 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 221 (*ifp->if_start)(ifp); 222 223 return 0; 224 } 225 226 /* 227 * Assign priority to a frame based on any vlan tag assigned 228 * to the station and/or any Diffserv setting in an IP header. 229 * Finally, if an ACM policy is setup (in station mode) it's 230 * applied. 231 */ 232 int 233 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 234 { 235 int v_wme_ac, d_wme_ac, ac; 236 #ifdef INET 237 struct ether_header *eh; 238 #endif 239 240 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 241 ac = WME_AC_BE; 242 goto done; 243 } 244 245 /* 246 * If node has a vlan tag then all traffic 247 * to it must have a matching tag. 248 */ 249 v_wme_ac = 0; 250 if (ni->ni_vlan != 0) { 251 /* XXX used to check ec_nvlans. */ 252 struct m_tag *mtag = m_tag_find(m, PACKET_TAG_VLAN, NULL); 253 if (mtag == NULL) { 254 IEEE80211_NODE_STAT(ni, tx_novlantag); 255 return 1; 256 } 257 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 258 EVL_VLANOFTAG(ni->ni_vlan)) { 259 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 260 return 1; 261 } 262 /* map vlan priority to AC */ 263 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 264 case 1: 265 case 2: 266 v_wme_ac = WME_AC_BK; 267 break; 268 case 0: 269 case 3: 270 v_wme_ac = WME_AC_BE; 271 break; 272 case 4: 273 case 5: 274 v_wme_ac = WME_AC_VI; 275 break; 276 case 6: 277 case 7: 278 v_wme_ac = WME_AC_VO; 279 break; 280 } 281 } 282 283 #ifdef INET 284 eh = mtod(m, struct ether_header *); 285 if (eh->ether_type == htons(ETHERTYPE_IP)) { 286 const struct ip *ip = (struct ip *) 287 (mtod(m, u_int8_t *) + sizeof (*eh)); 288 /* 289 * IP frame, map the TOS field. 290 */ 291 switch (ip->ip_tos) { 292 case 0x08: 293 case 0x20: 294 d_wme_ac = WME_AC_BK; /* background */ 295 break; 296 case 0x28: 297 case 0xa0: 298 d_wme_ac = WME_AC_VI; /* video */ 299 break; 300 case 0x30: /* voice */ 301 case 0xe0: 302 case 0x88: /* XXX UPSD */ 303 case 0xb8: 304 d_wme_ac = WME_AC_VO; 305 break; 306 default: 307 d_wme_ac = WME_AC_BE; 308 break; 309 } 310 } else { 311 #endif /* INET */ 312 d_wme_ac = WME_AC_BE; 313 #ifdef INET 314 } 315 #endif 316 /* 317 * Use highest priority AC. 318 */ 319 if (v_wme_ac > d_wme_ac) 320 ac = v_wme_ac; 321 else 322 ac = d_wme_ac; 323 324 /* 325 * Apply ACM policy. 326 */ 327 if (ic->ic_opmode == IEEE80211_M_STA) { 328 static const int acmap[4] = { 329 WME_AC_BK, /* WME_AC_BE */ 330 WME_AC_BK, /* WME_AC_BK */ 331 WME_AC_BE, /* WME_AC_VI */ 332 WME_AC_VI, /* WME_AC_VO */ 333 }; 334 while (ac != WME_AC_BK && 335 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 336 ac = acmap[ac]; 337 } 338 done: 339 M_WME_SETAC(m, ac); 340 return 0; 341 } 342 343 /* 344 * Insure there is sufficient contiguous space to encapsulate the 345 * 802.11 data frame. If room isn't already there, arrange for it. 346 * Drivers and cipher modules assume we have done the necessary work 347 * and fail rudely if they don't find the space they need. 348 */ 349 static struct mbuf * 350 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 351 struct ieee80211_key *key, struct mbuf *m) 352 { 353 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 354 int needed_space = hdrsize; 355 int wlen = 0; 356 357 if (key != NULL) { 358 /* XXX belongs in crypto code? */ 359 needed_space += key->wk_cipher->ic_header; 360 /* XXX frags */ 361 } 362 /* 363 * We know we are called just before stripping an Ethernet 364 * header and prepending an LLC header. This means we know 365 * there will be 366 * sizeof(struct ether_header) - sizeof(struct llc) 367 * bytes recovered to which we need additional space for the 368 * 802.11 header and any crypto header. 369 */ 370 /* XXX check trailing space and copy instead? */ 371 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 372 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 373 if (n == NULL) { 374 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 375 "%s: cannot expand storage\n", __func__); 376 ic->ic_stats.is_tx_nobuf++; 377 m_freem(m); 378 return NULL; 379 } 380 IASSERT(needed_space <= MHLEN, 381 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 382 /* 383 * Setup new mbuf to have leading space to prepend the 384 * 802.11 header and any crypto header bits that are 385 * required (the latter are added when the driver calls 386 * back to ieee80211_crypto_encap to do crypto encapsulation). 387 */ 388 /* NB: must be first 'cuz it clobbers m_data */ 389 M_MOVE_PKTHDR(n, m); 390 n->m_len = 0; /* NB: m_gethdr does not set */ 391 n->m_data += needed_space; 392 /* 393 * Pull up Ethernet header to create the expected layout. 394 * We could use m_pullup but that's overkill (i.e. we don't 395 * need the actual data) and it cannot fail so do it inline 396 * for speed. 397 */ 398 /* NB: struct ether_header is known to be contiguous */ 399 n->m_len += sizeof(struct ether_header); 400 m->m_len -= sizeof(struct ether_header); 401 m->m_data += sizeof(struct ether_header); 402 /* 403 * Replace the head of the chain. 404 */ 405 n->m_next = m; 406 m = n; 407 } else { 408 /* We will overwrite the ethernet header in the 409 * 802.11 encapsulation stage. Make sure that it 410 * is writable. 411 */ 412 wlen = sizeof(struct ether_header); 413 } 414 415 /* 416 * If we're going to s/w encrypt the mbuf chain make sure it is 417 * writable. 418 */ 419 if (key != NULL && (key->wk_flags & IEEE80211_KEY_SWCRYPT) != 0) 420 wlen = M_COPYALL; 421 422 if (wlen != 0 && m_makewritable(&m, 0, wlen, M_DONTWAIT) != 0) { 423 m_freem(m); 424 return NULL; 425 } 426 return m; 427 #undef TO_BE_RECLAIMED 428 } 429 430 /* 431 * Return the transmit key to use in sending a unicast frame. 432 * If a unicast key is set we use that. When no unicast key is set 433 * we fall back to the default transmit key. 434 */ 435 static __inline struct ieee80211_key * 436 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 437 { 438 if (IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)) { 439 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 440 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 441 return NULL; 442 return &ic->ic_nw_keys[ic->ic_def_txkey]; 443 } else { 444 return &ni->ni_ucastkey; 445 } 446 } 447 448 /* 449 * Return the transmit key to use in sending a multicast frame. 450 * Multicast traffic always uses the group key which is installed as 451 * the default tx key. 452 */ 453 static __inline struct ieee80211_key * 454 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 455 { 456 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 457 IEEE80211_KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 458 return NULL; 459 return &ic->ic_nw_keys[ic->ic_def_txkey]; 460 } 461 462 /* 463 * Encapsulate an outbound data frame. The mbuf chain is updated. 464 * If an error is encountered NULL is returned. The caller is required 465 * to provide a node reference and pullup the ethernet header in the 466 * first mbuf. 467 */ 468 struct mbuf * 469 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 470 struct ieee80211_node *ni) 471 { 472 struct ether_header eh; 473 struct ieee80211_frame *wh; 474 struct ieee80211_key *key; 475 struct llc *llc; 476 int hdrsize, datalen, addqos; 477 478 IASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 479 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 480 481 /* 482 * Insure space for additional headers. First identify 483 * transmit key to use in calculating any buffer adjustments 484 * required. This is also used below to do privacy 485 * encapsulation work. Then calculate the 802.11 header 486 * size and any padding required by the driver. 487 * 488 * Note key may be NULL if we fall back to the default 489 * transmit key and that is not set. In that case the 490 * buffer may not be expanded as needed by the cipher 491 * routines, but they will/should discard it. 492 */ 493 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 494 if (ic->ic_opmode == IEEE80211_M_STA || 495 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 496 key = ieee80211_crypto_getucastkey(ic, ni); 497 else 498 key = ieee80211_crypto_getmcastkey(ic, ni); 499 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 500 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 501 "[%s] no default transmit key (%s) deftxkey %u\n", 502 ether_sprintf(eh.ether_dhost), __func__, 503 ic->ic_def_txkey); 504 ic->ic_stats.is_tx_nodefkey++; 505 } 506 } else 507 key = NULL; 508 /* XXX 4-address format */ 509 /* 510 * XXX Some ap's don't handle QoS-encapsulated EAPOL 511 * frames so suppress use. This may be an issue if other 512 * ap's require all data frames to be QoS-encapsulated 513 * once negotiated in which case we'll need to make this 514 * configurable. 515 */ 516 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 517 eh.ether_type != htons(ETHERTYPE_PAE); 518 if (addqos) 519 hdrsize = sizeof(struct ieee80211_qosframe); 520 else 521 hdrsize = sizeof(struct ieee80211_frame); 522 if (ic->ic_flags & IEEE80211_F_DATAPAD) 523 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 524 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 525 if (m == NULL) { 526 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 527 goto bad; 528 } 529 530 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 531 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 532 llc = mtod(m, struct llc *); 533 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 534 llc->llc_control = LLC_UI; 535 llc->llc_snap.org_code[0] = 0; 536 llc->llc_snap.org_code[1] = 0; 537 llc->llc_snap.org_code[2] = 0; 538 llc->llc_snap.ether_type = eh.ether_type; 539 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 540 541 M_PREPEND(m, hdrsize, M_DONTWAIT); 542 if (m == NULL) { 543 ic->ic_stats.is_tx_nobuf++; 544 goto bad; 545 } 546 wh = mtod(m, struct ieee80211_frame *); 547 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 548 *(u_int16_t *)wh->i_dur = 0; 549 switch (ic->ic_opmode) { 550 case IEEE80211_M_STA: 551 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 552 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 553 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 554 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 555 break; 556 case IEEE80211_M_IBSS: 557 case IEEE80211_M_AHDEMO: 558 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 559 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 560 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 561 /* 562 * NB: always use the bssid from ic_bss as the 563 * neighbor's may be stale after an ibss merge 564 */ 565 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 566 break; 567 case IEEE80211_M_HOSTAP: 568 #ifndef IEEE80211_NO_HOSTAP 569 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 570 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 571 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 572 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 573 #endif /* !IEEE80211_NO_HOSTAP */ 574 break; 575 case IEEE80211_M_MONITOR: 576 goto bad; 577 } 578 if (m->m_flags & M_MORE_DATA) 579 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 580 if (addqos) { 581 struct ieee80211_qosframe *qwh = 582 (struct ieee80211_qosframe *) wh; 583 int ac, tid; 584 585 ac = M_WME_GETAC(m); 586 /* map from access class/queue to 11e header priorty value */ 587 tid = WME_AC_TO_TID(ac); 588 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 589 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 590 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 591 qwh->i_qos[1] = 0; 592 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 593 594 *(u_int16_t *)wh->i_seq = 595 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 596 ni->ni_txseqs[tid]++; 597 } else { 598 *(u_int16_t *)wh->i_seq = 599 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 600 ni->ni_txseqs[0]++; 601 } 602 if (key != NULL) { 603 /* 604 * IEEE 802.1X: send EAPOL frames always in the clear. 605 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 606 */ 607 if (eh.ether_type != htons(ETHERTYPE_PAE) || 608 ((ic->ic_flags & IEEE80211_F_WPA) && 609 (ic->ic_opmode == IEEE80211_M_STA ? 610 !IEEE80211_KEY_UNDEFINED(*key) : 611 !IEEE80211_KEY_UNDEFINED(ni->ni_ucastkey)))) { 612 wh->i_fc[1] |= IEEE80211_FC1_WEP; 613 /* XXX do fragmentation */ 614 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 615 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 616 "[%s] enmic failed, discard frame\n", 617 ether_sprintf(eh.ether_dhost)); 618 ic->ic_stats.is_crypto_enmicfail++; 619 goto bad; 620 } 621 } 622 } 623 624 IEEE80211_NODE_STAT(ni, tx_data); 625 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 626 627 return m; 628 bad: 629 if (m != NULL) 630 m_freem(m); 631 return NULL; 632 } 633 634 /* 635 * Arguments in: 636 * 637 * paylen: payload length (no FCS, no WEP header) 638 * 639 * hdrlen: header length 640 * 641 * rate: MSDU speed, units 500kb/s 642 * 643 * flags: IEEE80211_F_SHPREAMBLE (use short preamble), 644 * IEEE80211_F_SHSLOT (use short slot length) 645 * 646 * Arguments out: 647 * 648 * d: 802.11 Duration field for RTS, 649 * 802.11 Duration field for data frame, 650 * PLCP Length for data frame, 651 * residual octets at end of data slot 652 */ 653 static int 654 ieee80211_compute_duration1(int len, int use_ack, uint32_t flags, int rate, 655 struct ieee80211_duration *d) 656 { 657 int pre, ctsrate; 658 int ack, bitlen, data_dur, remainder; 659 660 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 661 * DATA reserves medium for SIFS | ACK 662 * 663 * XXXMYC: no ACK on multicast/broadcast or control packets 664 */ 665 666 bitlen = len * 8; 667 668 pre = IEEE80211_DUR_DS_SIFS; 669 if ((flags & IEEE80211_F_SHPREAMBLE) != 0) 670 pre += IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR; 671 else 672 pre += IEEE80211_DUR_DS_LONG_PREAMBLE + IEEE80211_DUR_DS_SLOW_PLCPHDR; 673 674 d->d_residue = 0; 675 data_dur = (bitlen * 2) / rate; 676 remainder = (bitlen * 2) % rate; 677 if (remainder != 0) { 678 d->d_residue = (rate - remainder) / 16; 679 data_dur++; 680 } 681 682 switch (rate) { 683 case 2: /* 1 Mb/s */ 684 case 4: /* 2 Mb/s */ 685 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 686 ctsrate = 2; 687 break; 688 case 11: /* 5.5 Mb/s */ 689 case 22: /* 11 Mb/s */ 690 case 44: /* 22 Mb/s */ 691 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 692 ctsrate = 4; 693 break; 694 default: 695 /* TBD */ 696 return -1; 697 } 698 699 d->d_plcp_len = data_dur; 700 701 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 702 703 d->d_rts_dur = 704 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 705 pre + data_dur + 706 ack; 707 708 d->d_data_dur = ack; 709 710 return 0; 711 } 712 713 /* 714 * Arguments in: 715 * 716 * wh: 802.11 header 717 * 718 * paylen: payload length (no FCS, no WEP header) 719 * 720 * rate: MSDU speed, units 500kb/s 721 * 722 * fraglen: fragment length, set to maximum (or higher) for no 723 * fragmentation 724 * 725 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 726 * IEEE80211_F_SHPREAMBLE (use short preamble), 727 * IEEE80211_F_SHSLOT (use short slot length) 728 * 729 * Arguments out: 730 * 731 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 732 * of first/only fragment 733 * 734 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 735 * of first/only fragment 736 */ 737 int 738 ieee80211_compute_duration(struct ieee80211_frame_min *wh, int len, 739 uint32_t flags, int fraglen, int rate, struct ieee80211_duration *d0, 740 struct ieee80211_duration *dn, int *npktp, int debug) 741 { 742 int ack, rc; 743 int firstlen, hdrlen, lastlen, lastlen0, npkt, overlen, paylen; 744 745 if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) 746 hdrlen = sizeof(struct ieee80211_frame_addr4); 747 else 748 hdrlen = sizeof(struct ieee80211_frame); 749 750 paylen = len - hdrlen; 751 752 if ((wh->i_fc[1] & IEEE80211_FC1_WEP) != 0) { 753 /* XXX assumes the packet is already WEP encapsulated */ 754 paylen -= IEEE80211_WEP_TOTLEN; 755 overlen = IEEE80211_WEP_TOTLEN + IEEE80211_CRC_LEN; 756 } else 757 overlen = IEEE80211_CRC_LEN; 758 759 npkt = paylen / fraglen; 760 lastlen0 = paylen % fraglen; 761 762 if (npkt == 0) /* no fragments */ 763 lastlen = paylen + overlen; 764 else if (lastlen0 != 0) { /* a short "tail" fragment */ 765 lastlen = lastlen0 + overlen; 766 npkt++; 767 } else /* full-length "tail" fragment */ 768 lastlen = fraglen + overlen; 769 770 if (npktp != NULL) 771 *npktp = npkt; 772 773 if (npkt > 1) 774 firstlen = fraglen + overlen; 775 else 776 firstlen = paylen + overlen; 777 778 if (debug) { 779 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 780 "fraglen %d overlen %d len %d rate %d flags %08x\n", 781 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 782 overlen, len, rate, flags); 783 } 784 785 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 786 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 787 788 rc = ieee80211_compute_duration1(firstlen + hdrlen, 789 ack, flags, rate, d0); 790 if (rc == -1) 791 return rc; 792 793 if (npkt <= 1) { 794 *dn = *d0; 795 return 0; 796 } 797 return ieee80211_compute_duration1(lastlen + hdrlen, ack, flags, rate, 798 dn); 799 } 800 801 /* 802 * Add a supported rates element id to a frame. 803 */ 804 static u_int8_t * 805 ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 806 { 807 int nrates; 808 809 *frm++ = IEEE80211_ELEMID_RATES; 810 nrates = rs->rs_nrates; 811 if (nrates > IEEE80211_RATE_SIZE) 812 nrates = IEEE80211_RATE_SIZE; 813 *frm++ = nrates; 814 memcpy(frm, rs->rs_rates, nrates); 815 return frm + nrates; 816 } 817 818 /* 819 * Add an extended supported rates element id to a frame. 820 */ 821 static u_int8_t * 822 ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 823 { 824 /* 825 * Add an extended supported rates element if operating in 11g mode. 826 */ 827 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 828 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 829 *frm++ = IEEE80211_ELEMID_XRATES; 830 *frm++ = nrates; 831 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 832 frm += nrates; 833 } 834 return frm; 835 } 836 837 /* 838 * Add an ssid elemet to a frame. 839 */ 840 static u_int8_t * 841 ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 842 { 843 *frm++ = IEEE80211_ELEMID_SSID; 844 *frm++ = len; 845 memcpy(frm, ssid, len); 846 return frm + len; 847 } 848 849 /* 850 * Add an erp element to a frame. 851 */ 852 static u_int8_t * 853 ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 854 { 855 u_int8_t erp; 856 857 *frm++ = IEEE80211_ELEMID_ERP; 858 *frm++ = 1; 859 erp = 0; 860 if (ic->ic_nonerpsta != 0) 861 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 862 if (ic->ic_flags & IEEE80211_F_USEPROT) 863 erp |= IEEE80211_ERP_USE_PROTECTION; 864 if (ic->ic_flags & IEEE80211_F_USEBARKER) 865 erp |= IEEE80211_ERP_LONG_PREAMBLE; 866 *frm++ = erp; 867 return frm; 868 } 869 870 static u_int8_t * 871 ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 872 { 873 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 874 #define ADDSHORT(frm, v) do { \ 875 frm[0] = (v) & 0xff; \ 876 frm[1] = (v) >> 8; \ 877 frm += 2; \ 878 } while (0) 879 #define ADDSELECTOR(frm, sel) do { \ 880 memcpy(frm, sel, 4); \ 881 frm += 4; \ 882 } while (0) 883 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 884 static const u_int8_t cipher_suite[][4] = { 885 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 886 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 887 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 888 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 889 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 890 { WPA_OUI_BYTES, WPA_CSE_NULL }, 891 }; 892 static const u_int8_t wep104_suite[4] = 893 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 894 static const u_int8_t key_mgt_unspec[4] = 895 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 896 static const u_int8_t key_mgt_psk[4] = 897 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 898 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 899 u_int8_t *frm = ie; 900 u_int8_t *selcnt; 901 902 *frm++ = IEEE80211_ELEMID_VENDOR; 903 *frm++ = 0; /* length filled in below */ 904 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 905 frm += sizeof(oui); 906 ADDSHORT(frm, WPA_VERSION); 907 908 /* XXX filter out CKIP */ 909 910 /* multicast cipher */ 911 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 912 rsn->rsn_mcastkeylen >= 13) 913 ADDSELECTOR(frm, wep104_suite); 914 else 915 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 916 917 /* unicast cipher list */ 918 selcnt = frm; 919 ADDSHORT(frm, 0); /* selector count */ 920 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 921 selcnt[0]++; 922 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 923 } 924 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 925 selcnt[0]++; 926 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 927 } 928 929 /* authenticator selector list */ 930 selcnt = frm; 931 ADDSHORT(frm, 0); /* selector count */ 932 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 933 selcnt[0]++; 934 ADDSELECTOR(frm, key_mgt_unspec); 935 } 936 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 937 selcnt[0]++; 938 ADDSELECTOR(frm, key_mgt_psk); 939 } 940 941 /* optional capabilities */ 942 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 943 ADDSHORT(frm, rsn->rsn_caps); 944 945 /* calculate element length */ 946 ie[1] = frm - ie - 2; 947 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 948 ("WPA IE too big, %u > %zu", 949 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 950 return frm; 951 #undef ADDSHORT 952 #undef ADDSELECTOR 953 #undef WPA_OUI_BYTES 954 } 955 956 static u_int8_t * 957 ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 958 { 959 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 960 #define ADDSHORT(frm, v) do { \ 961 frm[0] = (v) & 0xff; \ 962 frm[1] = (v) >> 8; \ 963 frm += 2; \ 964 } while (0) 965 #define ADDSELECTOR(frm, sel) do { \ 966 memcpy(frm, sel, 4); \ 967 frm += 4; \ 968 } while (0) 969 static const u_int8_t cipher_suite[][4] = { 970 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 971 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 972 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 973 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 974 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 975 { RSN_OUI_BYTES, RSN_CSE_NULL }, 976 }; 977 static const u_int8_t wep104_suite[4] = 978 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 979 static const u_int8_t key_mgt_unspec[4] = 980 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 981 static const u_int8_t key_mgt_psk[4] = 982 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 983 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 984 u_int8_t *frm = ie; 985 u_int8_t *selcnt; 986 987 *frm++ = IEEE80211_ELEMID_RSN; 988 *frm++ = 0; /* length filled in below */ 989 ADDSHORT(frm, RSN_VERSION); 990 991 /* XXX filter out CKIP */ 992 993 /* multicast cipher */ 994 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 995 rsn->rsn_mcastkeylen >= 13) 996 ADDSELECTOR(frm, wep104_suite); 997 else 998 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 999 1000 /* unicast cipher list */ 1001 selcnt = frm; 1002 ADDSHORT(frm, 0); /* selector count */ 1003 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 1004 selcnt[0]++; 1005 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 1006 } 1007 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 1008 selcnt[0]++; 1009 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 1010 } 1011 1012 /* authenticator selector list */ 1013 selcnt = frm; 1014 ADDSHORT(frm, 0); /* selector count */ 1015 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 1016 selcnt[0]++; 1017 ADDSELECTOR(frm, key_mgt_unspec); 1018 } 1019 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 1020 selcnt[0]++; 1021 ADDSELECTOR(frm, key_mgt_psk); 1022 } 1023 1024 /* optional capabilities */ 1025 ADDSHORT(frm, rsn->rsn_caps); 1026 /* XXX PMKID */ 1027 1028 /* calculate element length */ 1029 ie[1] = frm - ie - 2; 1030 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1031 ("RSN IE too big, %u > %zu", 1032 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1033 return frm; 1034 #undef ADDSELECTOR 1035 #undef ADDSHORT 1036 #undef RSN_OUI_BYTES 1037 } 1038 1039 /* 1040 * Add a WPA/RSN element to a frame. 1041 */ 1042 static u_int8_t * 1043 ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 1044 { 1045 1046 IASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 1047 if (ic->ic_flags & IEEE80211_F_WPA2) 1048 frm = ieee80211_setup_rsn_ie(ic, frm); 1049 if (ic->ic_flags & IEEE80211_F_WPA1) 1050 frm = ieee80211_setup_wpa_ie(ic, frm); 1051 return frm; 1052 } 1053 1054 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1055 /* 1056 * Add a WME information element to a frame. 1057 */ 1058 static u_int8_t * 1059 ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 1060 { 1061 static const struct ieee80211_wme_info info = { 1062 .wme_id = IEEE80211_ELEMID_VENDOR, 1063 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1064 .wme_oui = { WME_OUI_BYTES }, 1065 .wme_type = WME_OUI_TYPE, 1066 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1067 .wme_version = WME_VERSION, 1068 .wme_info = 0, 1069 }; 1070 memcpy(frm, &info, sizeof(info)); 1071 return frm + sizeof(info); 1072 } 1073 1074 /* 1075 * Add a WME parameters element to a frame. 1076 */ 1077 static u_int8_t * 1078 ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 1079 { 1080 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1081 #define ADDSHORT(frm, v) do { \ 1082 frm[0] = (v) & 0xff; \ 1083 frm[1] = (v) >> 8; \ 1084 frm += 2; \ 1085 } while (0) 1086 /* NB: this works 'cuz a param has an info at the front */ 1087 static const struct ieee80211_wme_info param = { 1088 .wme_id = IEEE80211_ELEMID_VENDOR, 1089 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1090 .wme_oui = { WME_OUI_BYTES }, 1091 .wme_type = WME_OUI_TYPE, 1092 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1093 .wme_version = WME_VERSION, 1094 }; 1095 int i; 1096 1097 memcpy(frm, ¶m, sizeof(param)); 1098 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1099 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1100 *frm++ = 0; /* reserved field */ 1101 for (i = 0; i < WME_NUM_AC; i++) { 1102 const struct wmeParams *ac = 1103 &wme->wme_bssChanParams.cap_wmeParams[i]; 1104 *frm++ = SM(i, WME_PARAM_ACI) 1105 | SM(ac->wmep_acm, WME_PARAM_ACM) 1106 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1107 ; 1108 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1109 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1110 ; 1111 ADDSHORT(frm, ac->wmep_txopLimit); 1112 } 1113 return frm; 1114 #undef SM 1115 #undef ADDSHORT 1116 } 1117 #undef WME_OUI_BYTES 1118 1119 /* 1120 * Send a management frame. The node is for the destination (or ic_bss 1121 * when in station mode). Nodes other than ic_bss have their reference 1122 * count bumped to reflect our use for an indeterminant time. 1123 */ 1124 int 1125 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1126 int type, int arg) 1127 { 1128 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1129 struct mbuf *m; 1130 u_int8_t *frm; 1131 enum ieee80211_phymode mode; 1132 u_int16_t capinfo; 1133 int has_challenge, is_shared_key, ret, timer, status; 1134 1135 IASSERT(ni != NULL, ("null node")); 1136 1137 /* 1138 * Hold a reference on the node so it doesn't go away until after 1139 * the xmit is complete all the way in the driver. On error we 1140 * will remove our reference. 1141 */ 1142 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1143 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1144 __func__, __LINE__, 1145 ni, ether_sprintf(ni->ni_macaddr), 1146 ieee80211_node_refcnt(ni)+1); 1147 ieee80211_ref_node(ni); 1148 1149 timer = 0; 1150 switch (type) { 1151 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1152 /* 1153 * prreq frame format 1154 * [tlv] ssid 1155 * [tlv] supported rates 1156 * [tlv] extended supported rates 1157 * [tlv] user-specified ie's 1158 */ 1159 m = ieee80211_getmgtframe(&frm, 1160 2 + IEEE80211_NWID_LEN 1161 + 2 + IEEE80211_RATE_SIZE 1162 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1163 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1164 ); 1165 if (m == NULL) 1166 senderr(ENOMEM, is_tx_nobuf); 1167 1168 frm = ieee80211_add_ssid(frm, ic->ic_des_essid, ic->ic_des_esslen); 1169 mode = ieee80211_chan2mode(ic, ni->ni_chan); 1170 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1171 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1172 if (ic->ic_opt_ie != NULL) { 1173 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1174 frm += ic->ic_opt_ie_len; 1175 } 1176 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1177 1178 IEEE80211_NODE_STAT(ni, tx_probereq); 1179 if (ic->ic_opmode == IEEE80211_M_STA) 1180 timer = IEEE80211_TRANS_WAIT; 1181 break; 1182 1183 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1184 /* 1185 * probe response frame format 1186 * [8] time stamp 1187 * [2] beacon interval 1188 * [2] cabability information 1189 * [tlv] ssid 1190 * [tlv] supported rates 1191 * [tlv] parameter set (FH/DS) 1192 * [tlv] parameter set (IBSS) 1193 * [tlv] extended rate phy (ERP) 1194 * [tlv] extended supported rates 1195 * [tlv] WPA 1196 * [tlv] WME (optional) 1197 */ 1198 m = ieee80211_getmgtframe(&frm, 1199 8 1200 + sizeof(u_int16_t) 1201 + sizeof(u_int16_t) 1202 + 2 + IEEE80211_NWID_LEN 1203 + 2 + IEEE80211_RATE_SIZE 1204 + 7 /* max(7,3) */ 1205 + 6 1206 + 3 1207 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1208 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1209 + (ic->ic_flags & IEEE80211_F_WPA ? 1210 2*sizeof(struct ieee80211_ie_wpa) : 0) 1211 + sizeof(struct ieee80211_wme_param) 1212 ); 1213 if (m == NULL) 1214 senderr(ENOMEM, is_tx_nobuf); 1215 1216 memset(frm, 0, 8); /* timestamp should be filled later */ 1217 frm += 8; 1218 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1219 frm += 2; 1220 if (ic->ic_opmode == IEEE80211_M_IBSS) 1221 capinfo = IEEE80211_CAPINFO_IBSS; 1222 else 1223 capinfo = IEEE80211_CAPINFO_ESS; 1224 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1225 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1226 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1227 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1228 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1229 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1230 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1231 *(u_int16_t *)frm = htole16(capinfo); 1232 frm += 2; 1233 1234 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1235 ic->ic_bss->ni_esslen); 1236 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1237 1238 if (ic->ic_phytype == IEEE80211_T_FH) { 1239 *frm++ = IEEE80211_ELEMID_FHPARMS; 1240 *frm++ = 5; 1241 *frm++ = ni->ni_fhdwell & 0x00ff; 1242 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1243 *frm++ = IEEE80211_FH_CHANSET( 1244 ieee80211_chan2ieee(ic, ni->ni_chan)); 1245 *frm++ = IEEE80211_FH_CHANPAT( 1246 ieee80211_chan2ieee(ic, ni->ni_chan)); 1247 *frm++ = ni->ni_fhindex; 1248 } else { 1249 *frm++ = IEEE80211_ELEMID_DSPARMS; 1250 *frm++ = 1; 1251 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1252 } 1253 1254 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1255 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1256 *frm++ = 2; 1257 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1258 } 1259 if (ic->ic_flags & IEEE80211_F_WPA) 1260 frm = ieee80211_add_wpa(frm, ic); 1261 if (ic->ic_curmode == IEEE80211_MODE_11G) 1262 frm = ieee80211_add_erp(frm, ic); 1263 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1264 if (ic->ic_flags & IEEE80211_F_WME) 1265 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1266 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1267 break; 1268 1269 case IEEE80211_FC0_SUBTYPE_AUTH: 1270 status = arg >> 16; 1271 arg &= 0xffff; 1272 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1273 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1274 ni->ni_challenge != NULL); 1275 1276 /* 1277 * Deduce whether we're doing open authentication or 1278 * shared key authentication. We do the latter if 1279 * we're in the middle of a shared key authentication 1280 * handshake or if we're initiating an authentication 1281 * request and configured to use shared key. 1282 */ 1283 is_shared_key = has_challenge || 1284 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1285 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1286 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1287 1288 m = ieee80211_getmgtframe(&frm, 1289 3 * sizeof(u_int16_t) 1290 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1291 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1292 ); 1293 if (m == NULL) 1294 senderr(ENOMEM, is_tx_nobuf); 1295 1296 ((u_int16_t *)frm)[0] = 1297 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1298 : htole16(IEEE80211_AUTH_ALG_OPEN); 1299 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1300 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1301 1302 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1303 ((u_int16_t *)frm)[3] = 1304 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1305 IEEE80211_ELEMID_CHALLENGE); 1306 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1307 IEEE80211_CHALLENGE_LEN); 1308 m->m_pkthdr.len = m->m_len = 1309 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1310 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1311 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1312 "[%s] request encrypt frame (%s)\n", 1313 ether_sprintf(ni->ni_macaddr), __func__); 1314 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1315 } 1316 } else 1317 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1318 1319 /* XXX not right for shared key */ 1320 if (status == IEEE80211_STATUS_SUCCESS) 1321 IEEE80211_NODE_STAT(ni, tx_auth); 1322 else 1323 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1324 1325 if (ic->ic_opmode == IEEE80211_M_STA) 1326 timer = IEEE80211_TRANS_WAIT; 1327 break; 1328 1329 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1330 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1331 "[%s] send station deauthenticate (reason %d)\n", 1332 ether_sprintf(ni->ni_macaddr), arg); 1333 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1334 if (m == NULL) 1335 senderr(ENOMEM, is_tx_nobuf); 1336 *(u_int16_t *)frm = htole16(arg); /* reason */ 1337 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1338 1339 IEEE80211_NODE_STAT(ni, tx_deauth); 1340 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1341 1342 ieee80211_node_unauthorize(ic, ni); /* port closed */ 1343 break; 1344 1345 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1346 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1347 /* 1348 * asreq frame format 1349 * [2] capability information 1350 * [2] listen interval 1351 * [6*] current AP address (reassoc only) 1352 * [tlv] ssid 1353 * [tlv] supported rates 1354 * [tlv] extended supported rates 1355 * [tlv] WME 1356 * [tlv] user-specified ie's 1357 */ 1358 m = ieee80211_getmgtframe(&frm, 1359 sizeof(u_int16_t) 1360 + sizeof(u_int16_t) 1361 + IEEE80211_ADDR_LEN 1362 + 2 + IEEE80211_NWID_LEN 1363 + 2 + IEEE80211_RATE_SIZE 1364 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1365 + sizeof(struct ieee80211_wme_info) 1366 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1367 ); 1368 if (m == NULL) 1369 senderr(ENOMEM, is_tx_nobuf); 1370 1371 capinfo = 0; 1372 if (ic->ic_opmode == IEEE80211_M_IBSS) 1373 capinfo |= IEEE80211_CAPINFO_IBSS; 1374 else /* IEEE80211_M_STA */ 1375 capinfo |= IEEE80211_CAPINFO_ESS; 1376 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1377 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1378 /* 1379 * NB: Some 11a AP's reject the request when 1380 * short premable is set. 1381 */ 1382 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1383 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1384 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1385 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1386 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1387 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1388 *(u_int16_t *)frm = htole16(capinfo); 1389 frm += 2; 1390 1391 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1392 frm += 2; 1393 1394 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1395 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1396 frm += IEEE80211_ADDR_LEN; 1397 } 1398 1399 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1400 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1401 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1402 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1403 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1404 if (ic->ic_opt_ie != NULL) { 1405 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1406 frm += ic->ic_opt_ie_len; 1407 } 1408 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1409 1410 timer = IEEE80211_TRANS_WAIT; 1411 break; 1412 1413 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1414 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1415 /* 1416 * asreq frame format 1417 * [2] capability information 1418 * [2] status 1419 * [2] association ID 1420 * [tlv] supported rates 1421 * [tlv] extended supported rates 1422 * [tlv] WME (if enabled and STA enabled) 1423 */ 1424 m = ieee80211_getmgtframe(&frm, 1425 sizeof(u_int16_t) 1426 + sizeof(u_int16_t) 1427 + sizeof(u_int16_t) 1428 + 2 + IEEE80211_RATE_SIZE 1429 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1430 + sizeof(struct ieee80211_wme_param) 1431 ); 1432 if (m == NULL) 1433 senderr(ENOMEM, is_tx_nobuf); 1434 1435 capinfo = IEEE80211_CAPINFO_ESS; 1436 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1437 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1438 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1439 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1440 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1441 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1442 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1443 *(u_int16_t *)frm = htole16(capinfo); 1444 frm += 2; 1445 1446 *(u_int16_t *)frm = htole16(arg); /* status */ 1447 frm += 2; 1448 1449 if (arg == IEEE80211_STATUS_SUCCESS) { 1450 *(u_int16_t *)frm = htole16(ni->ni_associd); 1451 IEEE80211_NODE_STAT(ni, tx_assoc); 1452 } else 1453 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1454 frm += 2; 1455 1456 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1457 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1458 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1459 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1460 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1461 break; 1462 1463 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1464 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1465 "[%s] send station disassociate (reason %d)\n", 1466 ether_sprintf(ni->ni_macaddr), arg); 1467 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1468 if (m == NULL) 1469 senderr(ENOMEM, is_tx_nobuf); 1470 *(u_int16_t *)frm = htole16(arg); /* reason */ 1471 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1472 1473 IEEE80211_NODE_STAT(ni, tx_disassoc); 1474 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1475 break; 1476 1477 default: 1478 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1479 "[%s] invalid mgmt frame type %u\n", 1480 ether_sprintf(ni->ni_macaddr), type); 1481 senderr(EINVAL, is_tx_unknownmgt); 1482 /* NOTREACHED */ 1483 } 1484 1485 ret = ieee80211_mgmt_output(ic, ni, m, type); 1486 if (ret == 0) { 1487 if (timer) 1488 ic->ic_mgt_timer = timer; 1489 } else { 1490 bad: 1491 ieee80211_free_node(ni); 1492 } 1493 return ret; 1494 #undef senderr 1495 } 1496 1497 /* 1498 * Allocate a beacon frame and fillin the appropriate bits. 1499 */ 1500 struct mbuf * 1501 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1502 struct ieee80211_beacon_offsets *bo) 1503 { 1504 struct ifnet *ifp = ic->ic_ifp; 1505 struct ieee80211_frame *wh; 1506 struct mbuf *m; 1507 int pktlen; 1508 u_int8_t *frm, *efrm; 1509 u_int16_t capinfo; 1510 struct ieee80211_rateset *rs; 1511 1512 /* 1513 * beacon frame format 1514 * [8] time stamp 1515 * [2] beacon interval 1516 * [2] cabability information 1517 * [tlv] ssid 1518 * [tlv] supported rates 1519 * [3] parameter set (DS) 1520 * [tlv] parameter set (IBSS/TIM) 1521 * [tlv] extended rate phy (ERP) 1522 * [tlv] extended supported rates 1523 * [tlv] WME parameters 1524 * [tlv] WPA/RSN parameters 1525 * XXX Vendor-specific OIDs (e.g. Atheros) 1526 * NB: we allocate the max space required for the TIM bitmap. 1527 */ 1528 rs = &ni->ni_rates; 1529 pktlen = 8 /* time stamp */ 1530 + sizeof(u_int16_t) /* beacon interval */ 1531 + sizeof(u_int16_t) /* capabilities */ 1532 + 2 + ni->ni_esslen /* ssid */ 1533 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1534 + 2 + 1 /* DS parameters */ 1535 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1536 + 2 + 1 /* ERP */ 1537 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1538 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1539 sizeof(struct ieee80211_wme_param) : 0) 1540 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1541 2*sizeof(struct ieee80211_ie_wpa) : 0) 1542 ; 1543 m = ieee80211_getmgtframe(&frm, pktlen); 1544 if (m == NULL) { 1545 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1546 "%s: cannot get buf; size %u\n", __func__, pktlen); 1547 ic->ic_stats.is_tx_nobuf++; 1548 return NULL; 1549 } 1550 1551 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1552 frm += 8; 1553 *(u_int16_t *)frm = htole16(ni->ni_intval); 1554 frm += 2; 1555 if (ic->ic_opmode == IEEE80211_M_IBSS) 1556 capinfo = IEEE80211_CAPINFO_IBSS; 1557 else 1558 capinfo = IEEE80211_CAPINFO_ESS; 1559 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1560 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1561 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1562 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1563 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1564 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1565 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1566 bo->bo_caps = (u_int16_t *)frm; 1567 *(u_int16_t *)frm = htole16(capinfo); 1568 frm += 2; 1569 *frm++ = IEEE80211_ELEMID_SSID; 1570 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1571 *frm++ = ni->ni_esslen; 1572 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1573 frm += ni->ni_esslen; 1574 } else 1575 *frm++ = 0; 1576 frm = ieee80211_add_rates(frm, rs); 1577 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1578 *frm++ = IEEE80211_ELEMID_DSPARMS; 1579 *frm++ = 1; 1580 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1581 } 1582 bo->bo_tim = frm; 1583 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1584 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1585 *frm++ = 2; 1586 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1587 bo->bo_tim_len = 0; 1588 } else { 1589 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1590 1591 tie->tim_ie = IEEE80211_ELEMID_TIM; 1592 tie->tim_len = 4; /* length */ 1593 tie->tim_count = 0; /* DTIM count */ 1594 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1595 tie->tim_bitctl = 0; /* bitmap control */ 1596 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1597 frm += sizeof(struct ieee80211_tim_ie); 1598 bo->bo_tim_len = 1; 1599 } 1600 bo->bo_trailer = frm; 1601 if (ic->ic_flags & IEEE80211_F_WME) { 1602 bo->bo_wme = frm; 1603 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1604 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1605 } 1606 if (ic->ic_flags & IEEE80211_F_WPA) 1607 frm = ieee80211_add_wpa(frm, ic); 1608 if (ic->ic_curmode == IEEE80211_MODE_11G) 1609 frm = ieee80211_add_erp(frm, ic); 1610 efrm = ieee80211_add_xrates(frm, rs); 1611 bo->bo_trailer_len = efrm - bo->bo_trailer; 1612 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1613 1614 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1615 IASSERT(m != NULL, ("no space for 802.11 header?")); 1616 wh = mtod(m, struct ieee80211_frame *); 1617 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1618 IEEE80211_FC0_SUBTYPE_BEACON; 1619 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1620 *(u_int16_t *)wh->i_dur = 0; 1621 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1622 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1623 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1624 *(u_int16_t *)wh->i_seq = 0; 1625 1626 return m; 1627 } 1628 1629 /* 1630 * Update the dynamic parts of a beacon frame based on the current state. 1631 */ 1632 int 1633 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1634 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1635 { 1636 int len_changed = 0; 1637 u_int16_t capinfo; 1638 1639 IEEE80211_BEACON_LOCK(ic); 1640 /* XXX faster to recalculate entirely or just changes? */ 1641 if (ic->ic_opmode == IEEE80211_M_IBSS) 1642 capinfo = IEEE80211_CAPINFO_IBSS; 1643 else 1644 capinfo = IEEE80211_CAPINFO_ESS; 1645 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1646 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1647 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1648 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1649 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1650 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1651 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1652 *bo->bo_caps = htole16(capinfo); 1653 1654 if (ic->ic_flags & IEEE80211_F_WME) { 1655 struct ieee80211_wme_state *wme = &ic->ic_wme; 1656 1657 /* 1658 * Check for agressive mode change. When there is 1659 * significant high priority traffic in the BSS 1660 * throttle back BE traffic by using conservative 1661 * parameters. Otherwise BE uses agressive params 1662 * to optimize performance of legacy/non-QoS traffic. 1663 */ 1664 if (wme->wme_flags & WME_F_AGGRMODE) { 1665 if (wme->wme_hipri_traffic > 1666 wme->wme_hipri_switch_thresh) { 1667 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1668 "%s: traffic %u, disable aggressive mode\n", 1669 __func__, wme->wme_hipri_traffic); 1670 wme->wme_flags &= ~WME_F_AGGRMODE; 1671 ieee80211_wme_updateparams_locked(ic); 1672 wme->wme_hipri_traffic = 1673 wme->wme_hipri_switch_hysteresis; 1674 } else 1675 wme->wme_hipri_traffic = 0; 1676 } else { 1677 if (wme->wme_hipri_traffic <= 1678 wme->wme_hipri_switch_thresh) { 1679 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1680 "%s: traffic %u, enable aggressive mode\n", 1681 __func__, wme->wme_hipri_traffic); 1682 wme->wme_flags |= WME_F_AGGRMODE; 1683 ieee80211_wme_updateparams_locked(ic); 1684 wme->wme_hipri_traffic = 0; 1685 } else 1686 wme->wme_hipri_traffic = 1687 wme->wme_hipri_switch_hysteresis; 1688 } 1689 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1690 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1691 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1692 } 1693 } 1694 1695 #ifndef IEEE80211_NO_HOSTAP 1696 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1697 struct ieee80211_tim_ie *tie = 1698 (struct ieee80211_tim_ie *) bo->bo_tim; 1699 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1700 u_int timlen, timoff, i; 1701 /* 1702 * ATIM/DTIM needs updating. If it fits in the 1703 * current space allocated then just copy in the 1704 * new bits. Otherwise we need to move any trailing 1705 * data to make room. Note that we know there is 1706 * contiguous space because ieee80211_beacon_allocate 1707 * insures there is space in the mbuf to write a 1708 * maximal-size virtual bitmap (based on ic_max_aid). 1709 */ 1710 /* 1711 * Calculate the bitmap size and offset, copy any 1712 * trailer out of the way, and then copy in the 1713 * new bitmap and update the information element. 1714 * Note that the tim bitmap must contain at least 1715 * one byte and any offset must be even. 1716 */ 1717 if (ic->ic_ps_pending != 0) { 1718 timoff = 128; /* impossibly large */ 1719 for (i = 0; i < ic->ic_tim_len; i++) 1720 if (ic->ic_tim_bitmap[i]) { 1721 timoff = i &~ 1; 1722 break; 1723 } 1724 IASSERT(timoff != 128, ("tim bitmap empty!")); 1725 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1726 if (ic->ic_tim_bitmap[i]) 1727 break; 1728 timlen = 1 + (i - timoff); 1729 } else { 1730 timoff = 0; 1731 timlen = 1; 1732 } 1733 if (timlen != bo->bo_tim_len) { 1734 /* copy up/down trailer */ 1735 ovbcopy(bo->bo_trailer, tie->tim_bitmap+timlen, 1736 bo->bo_trailer_len); 1737 bo->bo_trailer = tie->tim_bitmap+timlen; 1738 bo->bo_wme = bo->bo_trailer; 1739 bo->bo_tim_len = timlen; 1740 1741 /* update information element */ 1742 tie->tim_len = 3 + timlen; 1743 tie->tim_bitctl = timoff; 1744 len_changed = 1; 1745 } 1746 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1747 bo->bo_tim_len); 1748 1749 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1750 1751 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1752 "%s: TIM updated, pending %u, off %u, len %u\n", 1753 __func__, ic->ic_ps_pending, timoff, timlen); 1754 } 1755 /* count down DTIM period */ 1756 if (tie->tim_count == 0) 1757 tie->tim_count = tie->tim_period - 1; 1758 else 1759 tie->tim_count--; 1760 /* update state for buffered multicast frames on DTIM */ 1761 if (mcast && (tie->tim_count == 1 || tie->tim_period == 1)) 1762 tie->tim_bitctl |= 1; 1763 else 1764 tie->tim_bitctl &= ~1; 1765 } 1766 #endif /* !IEEE80211_NO_HOSTAP */ 1767 IEEE80211_BEACON_UNLOCK(ic); 1768 1769 return len_changed; 1770 } 1771 1772 /* 1773 * Save an outbound packet for a node in power-save sleep state. 1774 * The new packet is placed on the node's saved queue, and the TIM 1775 * is changed, if necessary. 1776 */ 1777 void 1778 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1779 struct mbuf *m) 1780 { 1781 int qlen, age; 1782 1783 IEEE80211_NODE_SAVEQ_LOCK(ni); 1784 if (IF_QFULL(&ni->ni_savedq)) { 1785 IF_DROP(&ni->ni_savedq); 1786 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1787 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1788 "[%s] pwr save q overflow, drops %d (size %d)\n", 1789 ether_sprintf(ni->ni_macaddr), 1790 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1791 #ifdef IEEE80211_DEBUG 1792 if (ieee80211_msg_dumppkts(ic)) 1793 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1794 #endif 1795 m_freem(m); 1796 return; 1797 } 1798 /* 1799 * Tag the frame with it's expiry time and insert 1800 * it in the queue. The aging interval is 4 times 1801 * the listen interval specified by the station. 1802 * Frames that sit around too long are reclaimed 1803 * using this information. 1804 */ 1805 /* XXX handle overflow? */ 1806 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */ 1807 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1808 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1809 1810 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1811 "[%s] save frame, %u now queued\n", 1812 ether_sprintf(ni->ni_macaddr), qlen); 1813 1814 if (qlen == 1) 1815 ic->ic_set_tim(ic, ni, 1); 1816 } 1817