ieee80211_output.c revision 155460
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 155460 2006-02-08 17:30:31Z sam $"); 35 36#include "opt_inet.h" 37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/mbuf.h> 41#include <sys/kernel.h> 42#include <sys/endian.h> 43 44#include <sys/socket.h> 45 46#include <net/bpf.h> 47#include <net/ethernet.h> 48#include <net/if.h> 49#include <net/if_llc.h> 50#include <net/if_media.h> 51#include <net/if_vlan_var.h> 52 53#include <net80211/ieee80211_var.h> 54 55#ifdef INET 56#include <netinet/in.h> 57#include <netinet/if_ether.h> 58#include <netinet/in_systm.h> 59#include <netinet/ip.h> 60#endif 61 62#ifdef IEEE80211_DEBUG 63/* 64 * Decide if an outbound management frame should be 65 * printed when debugging is enabled. This filters some 66 * of the less interesting frames that come frequently 67 * (e.g. beacons). 68 */ 69static __inline int 70doprint(struct ieee80211com *ic, int subtype) 71{ 72 switch (subtype) { 73 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 74 return (ic->ic_opmode == IEEE80211_M_IBSS); 75 } 76 return 1; 77} 78#endif 79 80/* 81 * Set the direction field and address fields of an outgoing 82 * non-QoS frame. Note this should be called early on in 83 * constructing a frame as it sets i_fc[1]; other bits can 84 * then be or'd in. 85 */ 86static void 87ieee80211_send_setup(struct ieee80211com *ic, 88 struct ieee80211_node *ni, 89 struct ieee80211_frame *wh, 90 int type, 91 const u_int8_t sa[IEEE80211_ADDR_LEN], 92 const u_int8_t da[IEEE80211_ADDR_LEN], 93 const u_int8_t bssid[IEEE80211_ADDR_LEN]) 94{ 95#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 96 97 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 98 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 99 switch (ic->ic_opmode) { 100 case IEEE80211_M_STA: 101 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 102 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 103 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 104 IEEE80211_ADDR_COPY(wh->i_addr3, da); 105 break; 106 case IEEE80211_M_IBSS: 107 case IEEE80211_M_AHDEMO: 108 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 109 IEEE80211_ADDR_COPY(wh->i_addr1, da); 110 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 111 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 112 break; 113 case IEEE80211_M_HOSTAP: 114 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 115 IEEE80211_ADDR_COPY(wh->i_addr1, da); 116 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 117 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 118 break; 119 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 120 break; 121 } 122 } else { 123 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 124 IEEE80211_ADDR_COPY(wh->i_addr1, da); 125 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 126 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 127 } 128 *(u_int16_t *)&wh->i_dur[0] = 0; 129 /* NB: use non-QoS tid */ 130 *(u_int16_t *)&wh->i_seq[0] = 131 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 132 ni->ni_txseqs[0]++; 133#undef WH4 134} 135 136/* 137 * Send a management frame to the specified node. The node pointer 138 * must have a reference as the pointer will be passed to the driver 139 * and potentially held for a long time. If the frame is successfully 140 * dispatched to the driver, then it is responsible for freeing the 141 * reference (and potentially free'ing up any associated storage). 142 */ 143static int 144ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 145 struct mbuf *m, int type, int timer) 146{ 147 struct ifnet *ifp = ic->ic_ifp; 148 struct ieee80211_frame *wh; 149 150 KASSERT(ni != NULL, ("null node")); 151 152 /* 153 * Yech, hack alert! We want to pass the node down to the 154 * driver's start routine. If we don't do so then the start 155 * routine must immediately look it up again and that can 156 * cause a lock order reversal if, for example, this frame 157 * is being sent because the station is being timedout and 158 * the frame being sent is a DEAUTH message. We could stick 159 * this in an m_tag and tack that on to the mbuf. However 160 * that's rather expensive to do for every frame so instead 161 * we stuff it in the rcvif field since outbound frames do 162 * not (presently) use this. 163 */ 164 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 165 if (m == NULL) 166 return ENOMEM; 167 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 168 m->m_pkthdr.rcvif = (void *)ni; 169 170 wh = mtod(m, struct ieee80211_frame *); 171 ieee80211_send_setup(ic, ni, wh, 172 IEEE80211_FC0_TYPE_MGT | type, 173 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 174 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 175 m->m_flags &= ~M_LINK0; 176 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 177 "[%s] encrypting frame (%s)\n", 178 ether_sprintf(wh->i_addr1), __func__); 179 wh->i_fc[1] |= IEEE80211_FC1_WEP; 180 } 181#ifdef IEEE80211_DEBUG 182 /* avoid printing too many frames */ 183 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 184 ieee80211_msg_dumppkts(ic)) { 185 printf("[%s] send %s on channel %u\n", 186 ether_sprintf(wh->i_addr1), 187 ieee80211_mgt_subtype_name[ 188 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 189 IEEE80211_FC0_SUBTYPE_SHIFT], 190 ieee80211_chan2ieee(ic, ic->ic_curchan)); 191 } 192#endif 193 IEEE80211_NODE_STAT(ni, tx_mgmt); 194 IF_ENQUEUE(&ic->ic_mgtq, m); 195 if (timer) { 196 /* 197 * Set the mgt frame timeout. 198 */ 199 ic->ic_mgt_timer = timer; 200 ifp->if_timer = 1; 201 } 202 if_start(ifp); 203 return 0; 204} 205 206/* 207 * Send a null data frame to the specified node. 208 * 209 * NB: the caller is assumed to have setup a node reference 210 * for use; this is necessary to deal with a race condition 211 * when probing for inactive stations. 212 */ 213int 214ieee80211_send_nulldata(struct ieee80211_node *ni) 215{ 216 struct ieee80211com *ic = ni->ni_ic; 217 struct ifnet *ifp = ic->ic_ifp; 218 struct mbuf *m; 219 struct ieee80211_frame *wh; 220 221 MGETHDR(m, M_NOWAIT, MT_DATA); 222 if (m == NULL) { 223 /* XXX debug msg */ 224 ic->ic_stats.is_tx_nobuf++; 225 ieee80211_unref_node(&ni); 226 return ENOMEM; 227 } 228 m->m_pkthdr.rcvif = (void *) ni; 229 230 wh = mtod(m, struct ieee80211_frame *); 231 ieee80211_send_setup(ic, ni, wh, 232 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 233 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 234 /* NB: power management bit is never sent by an AP */ 235 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 236 ic->ic_opmode != IEEE80211_M_HOSTAP) 237 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 238 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 239 240 IEEE80211_NODE_STAT(ni, tx_data); 241 242 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 243 "[%s] send null data frame on channel %u, pwr mgt %s\n", 244 ether_sprintf(ni->ni_macaddr), 245 ieee80211_chan2ieee(ic, ic->ic_curchan), 246 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 247 248 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 249 if_start(ifp); 250 251 return 0; 252} 253 254/* 255 * Assign priority to a frame based on any vlan tag assigned 256 * to the station and/or any Diffserv setting in an IP header. 257 * Finally, if an ACM policy is setup (in station mode) it's 258 * applied. 259 */ 260int 261ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 262{ 263 int v_wme_ac, d_wme_ac, ac; 264#ifdef INET 265 struct ether_header *eh; 266#endif 267 268 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 269 ac = WME_AC_BE; 270 goto done; 271 } 272 273 /* 274 * If node has a vlan tag then all traffic 275 * to it must have a matching tag. 276 */ 277 v_wme_ac = 0; 278 if (ni->ni_vlan != 0) { 279 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m); 280 if (mtag == NULL) { 281 IEEE80211_NODE_STAT(ni, tx_novlantag); 282 return 1; 283 } 284 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 285 EVL_VLANOFTAG(ni->ni_vlan)) { 286 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 287 return 1; 288 } 289 /* map vlan priority to AC */ 290 switch (EVL_PRIOFTAG(ni->ni_vlan)) { 291 case 1: 292 case 2: 293 v_wme_ac = WME_AC_BK; 294 break; 295 case 0: 296 case 3: 297 v_wme_ac = WME_AC_BE; 298 break; 299 case 4: 300 case 5: 301 v_wme_ac = WME_AC_VI; 302 break; 303 case 6: 304 case 7: 305 v_wme_ac = WME_AC_VO; 306 break; 307 } 308 } 309 310#ifdef INET 311 eh = mtod(m, struct ether_header *); 312 if (eh->ether_type == htons(ETHERTYPE_IP)) { 313 const struct ip *ip = (struct ip *) 314 (mtod(m, u_int8_t *) + sizeof (*eh)); 315 /* 316 * IP frame, map the TOS field. 317 */ 318 switch (ip->ip_tos) { 319 case 0x08: 320 case 0x20: 321 d_wme_ac = WME_AC_BK; /* background */ 322 break; 323 case 0x28: 324 case 0xa0: 325 d_wme_ac = WME_AC_VI; /* video */ 326 break; 327 case 0x30: /* voice */ 328 case 0xe0: 329 case 0x88: /* XXX UPSD */ 330 case 0xb8: 331 d_wme_ac = WME_AC_VO; 332 break; 333 default: 334 d_wme_ac = WME_AC_BE; 335 break; 336 } 337 } else { 338#endif /* INET */ 339 d_wme_ac = WME_AC_BE; 340#ifdef INET 341 } 342#endif 343 /* 344 * Use highest priority AC. 345 */ 346 if (v_wme_ac > d_wme_ac) 347 ac = v_wme_ac; 348 else 349 ac = d_wme_ac; 350 351 /* 352 * Apply ACM policy. 353 */ 354 if (ic->ic_opmode == IEEE80211_M_STA) { 355 static const int acmap[4] = { 356 WME_AC_BK, /* WME_AC_BE */ 357 WME_AC_BK, /* WME_AC_BK */ 358 WME_AC_BE, /* WME_AC_VI */ 359 WME_AC_VI, /* WME_AC_VO */ 360 }; 361 while (ac != WME_AC_BK && 362 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 363 ac = acmap[ac]; 364 } 365done: 366 M_WME_SETAC(m, ac); 367 return 0; 368} 369 370/* 371 * Insure there is sufficient contiguous space to encapsulate the 372 * 802.11 data frame. If room isn't already there, arrange for it. 373 * Drivers and cipher modules assume we have done the necessary work 374 * and fail rudely if they don't find the space they need. 375 */ 376static struct mbuf * 377ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 378 struct ieee80211_key *key, struct mbuf *m) 379{ 380#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 381 int needed_space = hdrsize; 382 383 if (key != NULL) { 384 /* XXX belongs in crypto code? */ 385 needed_space += key->wk_cipher->ic_header; 386 /* XXX frags */ 387 } 388 /* 389 * We know we are called just before stripping an Ethernet 390 * header and prepending an LLC header. This means we know 391 * there will be 392 * sizeof(struct ether_header) - sizeof(struct llc) 393 * bytes recovered to which we need additional space for the 394 * 802.11 header and any crypto header. 395 */ 396 /* XXX check trailing space and copy instead? */ 397 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 398 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 399 if (n == NULL) { 400 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 401 "%s: cannot expand storage\n", __func__); 402 ic->ic_stats.is_tx_nobuf++; 403 m_freem(m); 404 return NULL; 405 } 406 KASSERT(needed_space <= MHLEN, 407 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 408 /* 409 * Setup new mbuf to have leading space to prepend the 410 * 802.11 header and any crypto header bits that are 411 * required (the latter are added when the driver calls 412 * back to ieee80211_crypto_encap to do crypto encapsulation). 413 */ 414 /* NB: must be first 'cuz it clobbers m_data */ 415 m_move_pkthdr(n, m); 416 n->m_len = 0; /* NB: m_gethdr does not set */ 417 n->m_data += needed_space; 418 /* 419 * Pull up Ethernet header to create the expected layout. 420 * We could use m_pullup but that's overkill (i.e. we don't 421 * need the actual data) and it cannot fail so do it inline 422 * for speed. 423 */ 424 /* NB: struct ether_header is known to be contiguous */ 425 n->m_len += sizeof(struct ether_header); 426 m->m_len -= sizeof(struct ether_header); 427 m->m_data += sizeof(struct ether_header); 428 /* 429 * Replace the head of the chain. 430 */ 431 n->m_next = m; 432 m = n; 433 } 434 return m; 435#undef TO_BE_RECLAIMED 436} 437 438#define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none) 439/* 440 * Return the transmit key to use in sending a unicast frame. 441 * If a unicast key is set we use that. When no unicast key is set 442 * we fall back to the default transmit key. 443 */ 444static __inline struct ieee80211_key * 445ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 446{ 447 if (KEY_UNDEFINED(ni->ni_ucastkey)) { 448 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 449 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 450 return NULL; 451 return &ic->ic_nw_keys[ic->ic_def_txkey]; 452 } else { 453 return &ni->ni_ucastkey; 454 } 455} 456 457/* 458 * Return the transmit key to use in sending a multicast frame. 459 * Multicast traffic always uses the group key which is installed as 460 * the default tx key. 461 */ 462static __inline struct ieee80211_key * 463ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 464{ 465 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 466 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey])) 467 return NULL; 468 return &ic->ic_nw_keys[ic->ic_def_txkey]; 469} 470 471/* 472 * Encapsulate an outbound data frame. The mbuf chain is updated. 473 * If an error is encountered NULL is returned. The caller is required 474 * to provide a node reference and pullup the ethernet header in the 475 * first mbuf. 476 */ 477struct mbuf * 478ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 479 struct ieee80211_node *ni) 480{ 481 struct ether_header eh; 482 struct ieee80211_frame *wh; 483 struct ieee80211_key *key; 484 struct llc *llc; 485 int hdrsize, datalen, addqos; 486 487 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 488 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header)); 489 490 /* 491 * Insure space for additional headers. First identify 492 * transmit key to use in calculating any buffer adjustments 493 * required. This is also used below to do privacy 494 * encapsulation work. Then calculate the 802.11 header 495 * size and any padding required by the driver. 496 * 497 * Note key may be NULL if we fall back to the default 498 * transmit key and that is not set. In that case the 499 * buffer may not be expanded as needed by the cipher 500 * routines, but they will/should discard it. 501 */ 502 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 503 if (ic->ic_opmode == IEEE80211_M_STA || 504 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 505 key = ieee80211_crypto_getucastkey(ic, ni); 506 else 507 key = ieee80211_crypto_getmcastkey(ic, ni); 508 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 509 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 510 "[%s] no default transmit key (%s) deftxkey %u\n", 511 ether_sprintf(eh.ether_dhost), __func__, 512 ic->ic_def_txkey); 513 ic->ic_stats.is_tx_nodefkey++; 514 } 515 } else 516 key = NULL; 517 /* XXX 4-address format */ 518 /* 519 * XXX Some ap's don't handle QoS-encapsulated EAPOL 520 * frames so suppress use. This may be an issue if other 521 * ap's require all data frames to be QoS-encapsulated 522 * once negotiated in which case we'll need to make this 523 * configurable. 524 */ 525 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) && 526 eh.ether_type != htons(ETHERTYPE_PAE); 527 if (addqos) 528 hdrsize = sizeof(struct ieee80211_qosframe); 529 else 530 hdrsize = sizeof(struct ieee80211_frame); 531 if (ic->ic_flags & IEEE80211_F_DATAPAD) 532 hdrsize = roundup(hdrsize, sizeof(u_int32_t)); 533 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 534 if (m == NULL) { 535 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 536 goto bad; 537 } 538 539 /* NB: this could be optimized because of ieee80211_mbuf_adjust */ 540 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 541 llc = mtod(m, struct llc *); 542 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 543 llc->llc_control = LLC_UI; 544 llc->llc_snap.org_code[0] = 0; 545 llc->llc_snap.org_code[1] = 0; 546 llc->llc_snap.org_code[2] = 0; 547 llc->llc_snap.ether_type = eh.ether_type; 548 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 549 550 M_PREPEND(m, hdrsize, M_DONTWAIT); 551 if (m == NULL) { 552 ic->ic_stats.is_tx_nobuf++; 553 goto bad; 554 } 555 wh = mtod(m, struct ieee80211_frame *); 556 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 557 *(u_int16_t *)wh->i_dur = 0; 558 switch (ic->ic_opmode) { 559 case IEEE80211_M_STA: 560 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 561 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 562 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 563 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 564 break; 565 case IEEE80211_M_IBSS: 566 case IEEE80211_M_AHDEMO: 567 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 568 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 569 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 570 /* 571 * NB: always use the bssid from ic_bss as the 572 * neighbor's may be stale after an ibss merge 573 */ 574 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 575 break; 576 case IEEE80211_M_HOSTAP: 577 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 578 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 579 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 580 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 581 break; 582 case IEEE80211_M_MONITOR: 583 goto bad; 584 } 585 if (m->m_flags & M_MORE_DATA) 586 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 587 if (addqos) { 588 struct ieee80211_qosframe *qwh = 589 (struct ieee80211_qosframe *) wh; 590 int ac, tid; 591 592 ac = M_WME_GETAC(m); 593 /* map from access class/queue to 11e header priorty value */ 594 tid = WME_AC_TO_TID(ac); 595 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 596 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 597 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S; 598 qwh->i_qos[1] = 0; 599 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 600 601 *(u_int16_t *)wh->i_seq = 602 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 603 ni->ni_txseqs[tid]++; 604 } else { 605 *(u_int16_t *)wh->i_seq = 606 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT); 607 ni->ni_txseqs[0]++; 608 } 609 if (key != NULL) { 610 /* 611 * IEEE 802.1X: send EAPOL frames always in the clear. 612 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 613 */ 614 if (eh.ether_type != htons(ETHERTYPE_PAE) || 615 ((ic->ic_flags & IEEE80211_F_WPA) && 616 (ic->ic_opmode == IEEE80211_M_STA ? 617 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) { 618 wh->i_fc[1] |= IEEE80211_FC1_WEP; 619 /* XXX do fragmentation */ 620 if (!ieee80211_crypto_enmic(ic, key, m, 0)) { 621 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 622 "[%s] enmic failed, discard frame\n", 623 ether_sprintf(eh.ether_dhost)); 624 ic->ic_stats.is_crypto_enmicfail++; 625 goto bad; 626 } 627 } 628 } 629 630 IEEE80211_NODE_STAT(ni, tx_data); 631 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 632 633 return m; 634bad: 635 if (m != NULL) 636 m_freem(m); 637 return NULL; 638} 639 640/* 641 * Add a supported rates element id to a frame. 642 */ 643static u_int8_t * 644ieee80211_add_rates(u_int8_t *frm, const struct ieee80211_rateset *rs) 645{ 646 int nrates; 647 648 *frm++ = IEEE80211_ELEMID_RATES; 649 nrates = rs->rs_nrates; 650 if (nrates > IEEE80211_RATE_SIZE) 651 nrates = IEEE80211_RATE_SIZE; 652 *frm++ = nrates; 653 memcpy(frm, rs->rs_rates, nrates); 654 return frm + nrates; 655} 656 657/* 658 * Add an extended supported rates element id to a frame. 659 */ 660static u_int8_t * 661ieee80211_add_xrates(u_int8_t *frm, const struct ieee80211_rateset *rs) 662{ 663 /* 664 * Add an extended supported rates element if operating in 11g mode. 665 */ 666 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 667 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 668 *frm++ = IEEE80211_ELEMID_XRATES; 669 *frm++ = nrates; 670 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 671 frm += nrates; 672 } 673 return frm; 674} 675 676/* 677 * Add an ssid elemet to a frame. 678 */ 679static u_int8_t * 680ieee80211_add_ssid(u_int8_t *frm, const u_int8_t *ssid, u_int len) 681{ 682 *frm++ = IEEE80211_ELEMID_SSID; 683 *frm++ = len; 684 memcpy(frm, ssid, len); 685 return frm + len; 686} 687 688/* 689 * Add an erp element to a frame. 690 */ 691static u_int8_t * 692ieee80211_add_erp(u_int8_t *frm, struct ieee80211com *ic) 693{ 694 u_int8_t erp; 695 696 *frm++ = IEEE80211_ELEMID_ERP; 697 *frm++ = 1; 698 erp = 0; 699 if (ic->ic_nonerpsta != 0) 700 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 701 if (ic->ic_flags & IEEE80211_F_USEPROT) 702 erp |= IEEE80211_ERP_USE_PROTECTION; 703 if (ic->ic_flags & IEEE80211_F_USEBARKER) 704 erp |= IEEE80211_ERP_LONG_PREAMBLE; 705 *frm++ = erp; 706 return frm; 707} 708 709static u_int8_t * 710ieee80211_setup_wpa_ie(struct ieee80211com *ic, u_int8_t *ie) 711{ 712#define WPA_OUI_BYTES 0x00, 0x50, 0xf2 713#define ADDSHORT(frm, v) do { \ 714 frm[0] = (v) & 0xff; \ 715 frm[1] = (v) >> 8; \ 716 frm += 2; \ 717} while (0) 718#define ADDSELECTOR(frm, sel) do { \ 719 memcpy(frm, sel, 4); \ 720 frm += 4; \ 721} while (0) 722 static const u_int8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 723 static const u_int8_t cipher_suite[][4] = { 724 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 725 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 726 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 727 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 728 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 729 { WPA_OUI_BYTES, WPA_CSE_NULL }, 730 }; 731 static const u_int8_t wep104_suite[4] = 732 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 733 static const u_int8_t key_mgt_unspec[4] = 734 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 735 static const u_int8_t key_mgt_psk[4] = 736 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 737 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 738 u_int8_t *frm = ie; 739 u_int8_t *selcnt; 740 741 *frm++ = IEEE80211_ELEMID_VENDOR; 742 *frm++ = 0; /* length filled in below */ 743 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 744 frm += sizeof(oui); 745 ADDSHORT(frm, WPA_VERSION); 746 747 /* XXX filter out CKIP */ 748 749 /* multicast cipher */ 750 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 751 rsn->rsn_mcastkeylen >= 13) 752 ADDSELECTOR(frm, wep104_suite); 753 else 754 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 755 756 /* unicast cipher list */ 757 selcnt = frm; 758 ADDSHORT(frm, 0); /* selector count */ 759 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 760 selcnt[0]++; 761 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 762 } 763 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 764 selcnt[0]++; 765 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 766 } 767 768 /* authenticator selector list */ 769 selcnt = frm; 770 ADDSHORT(frm, 0); /* selector count */ 771 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 772 selcnt[0]++; 773 ADDSELECTOR(frm, key_mgt_unspec); 774 } 775 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 776 selcnt[0]++; 777 ADDSELECTOR(frm, key_mgt_psk); 778 } 779 780 /* optional capabilities */ 781 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 782 ADDSHORT(frm, rsn->rsn_caps); 783 784 /* calculate element length */ 785 ie[1] = frm - ie - 2; 786 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 787 ("WPA IE too big, %u > %zu", 788 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 789 return frm; 790#undef ADDSHORT 791#undef ADDSELECTOR 792#undef WPA_OUI_BYTES 793} 794 795static u_int8_t * 796ieee80211_setup_rsn_ie(struct ieee80211com *ic, u_int8_t *ie) 797{ 798#define RSN_OUI_BYTES 0x00, 0x0f, 0xac 799#define ADDSHORT(frm, v) do { \ 800 frm[0] = (v) & 0xff; \ 801 frm[1] = (v) >> 8; \ 802 frm += 2; \ 803} while (0) 804#define ADDSELECTOR(frm, sel) do { \ 805 memcpy(frm, sel, 4); \ 806 frm += 4; \ 807} while (0) 808 static const u_int8_t cipher_suite[][4] = { 809 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 810 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 811 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 812 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 813 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 814 { RSN_OUI_BYTES, RSN_CSE_NULL }, 815 }; 816 static const u_int8_t wep104_suite[4] = 817 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 818 static const u_int8_t key_mgt_unspec[4] = 819 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 820 static const u_int8_t key_mgt_psk[4] = 821 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 822 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 823 u_int8_t *frm = ie; 824 u_int8_t *selcnt; 825 826 *frm++ = IEEE80211_ELEMID_RSN; 827 *frm++ = 0; /* length filled in below */ 828 ADDSHORT(frm, RSN_VERSION); 829 830 /* XXX filter out CKIP */ 831 832 /* multicast cipher */ 833 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 834 rsn->rsn_mcastkeylen >= 13) 835 ADDSELECTOR(frm, wep104_suite); 836 else 837 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 838 839 /* unicast cipher list */ 840 selcnt = frm; 841 ADDSHORT(frm, 0); /* selector count */ 842 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 843 selcnt[0]++; 844 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 845 } 846 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 847 selcnt[0]++; 848 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 849 } 850 851 /* authenticator selector list */ 852 selcnt = frm; 853 ADDSHORT(frm, 0); /* selector count */ 854 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 855 selcnt[0]++; 856 ADDSELECTOR(frm, key_mgt_unspec); 857 } 858 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 859 selcnt[0]++; 860 ADDSELECTOR(frm, key_mgt_psk); 861 } 862 863 /* optional capabilities */ 864 ADDSHORT(frm, rsn->rsn_caps); 865 /* XXX PMKID */ 866 867 /* calculate element length */ 868 ie[1] = frm - ie - 2; 869 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 870 ("RSN IE too big, %u > %zu", 871 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 872 return frm; 873#undef ADDSELECTOR 874#undef ADDSHORT 875#undef RSN_OUI_BYTES 876} 877 878/* 879 * Add a WPA/RSN element to a frame. 880 */ 881static u_int8_t * 882ieee80211_add_wpa(u_int8_t *frm, struct ieee80211com *ic) 883{ 884 885 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 886 if (ic->ic_flags & IEEE80211_F_WPA2) 887 frm = ieee80211_setup_rsn_ie(ic, frm); 888 if (ic->ic_flags & IEEE80211_F_WPA1) 889 frm = ieee80211_setup_wpa_ie(ic, frm); 890 return frm; 891} 892 893#define WME_OUI_BYTES 0x00, 0x50, 0xf2 894/* 895 * Add a WME information element to a frame. 896 */ 897static u_int8_t * 898ieee80211_add_wme_info(u_int8_t *frm, struct ieee80211_wme_state *wme) 899{ 900 static const struct ieee80211_wme_info info = { 901 .wme_id = IEEE80211_ELEMID_VENDOR, 902 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 903 .wme_oui = { WME_OUI_BYTES }, 904 .wme_type = WME_OUI_TYPE, 905 .wme_subtype = WME_INFO_OUI_SUBTYPE, 906 .wme_version = WME_VERSION, 907 .wme_info = 0, 908 }; 909 memcpy(frm, &info, sizeof(info)); 910 return frm + sizeof(info); 911} 912 913/* 914 * Add a WME parameters element to a frame. 915 */ 916static u_int8_t * 917ieee80211_add_wme_param(u_int8_t *frm, struct ieee80211_wme_state *wme) 918{ 919#define SM(_v, _f) (((_v) << _f##_S) & _f) 920#define ADDSHORT(frm, v) do { \ 921 frm[0] = (v) & 0xff; \ 922 frm[1] = (v) >> 8; \ 923 frm += 2; \ 924} while (0) 925 /* NB: this works 'cuz a param has an info at the front */ 926 static const struct ieee80211_wme_info param = { 927 .wme_id = IEEE80211_ELEMID_VENDOR, 928 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 929 .wme_oui = { WME_OUI_BYTES }, 930 .wme_type = WME_OUI_TYPE, 931 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 932 .wme_version = WME_VERSION, 933 }; 934 int i; 935 936 memcpy(frm, ¶m, sizeof(param)); 937 frm += __offsetof(struct ieee80211_wme_info, wme_info); 938 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 939 *frm++ = 0; /* reserved field */ 940 for (i = 0; i < WME_NUM_AC; i++) { 941 const struct wmeParams *ac = 942 &wme->wme_bssChanParams.cap_wmeParams[i]; 943 *frm++ = SM(i, WME_PARAM_ACI) 944 | SM(ac->wmep_acm, WME_PARAM_ACM) 945 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 946 ; 947 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 948 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 949 ; 950 ADDSHORT(frm, ac->wmep_txopLimit); 951 } 952 return frm; 953#undef SM 954#undef ADDSHORT 955} 956#undef WME_OUI_BYTES 957 958/* 959 * Send a probe request frame with the specified ssid 960 * and any optional information element data. 961 */ 962int 963ieee80211_send_probereq(struct ieee80211_node *ni, 964 const u_int8_t sa[IEEE80211_ADDR_LEN], 965 const u_int8_t da[IEEE80211_ADDR_LEN], 966 const u_int8_t bssid[IEEE80211_ADDR_LEN], 967 const u_int8_t *ssid, size_t ssidlen, 968 const void *optie, size_t optielen) 969{ 970 struct ieee80211com *ic = ni->ni_ic; 971 enum ieee80211_phymode mode; 972 struct ieee80211_frame *wh; 973 struct mbuf *m; 974 u_int8_t *frm; 975 976 /* 977 * Hold a reference on the node so it doesn't go away until after 978 * the xmit is complete all the way in the driver. On error we 979 * will remove our reference. 980 */ 981 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 982 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 983 __func__, __LINE__, 984 ni, ether_sprintf(ni->ni_macaddr), 985 ieee80211_node_refcnt(ni)+1); 986 ieee80211_ref_node(ni); 987 988 /* 989 * prreq frame format 990 * [tlv] ssid 991 * [tlv] supported rates 992 * [tlv] extended supported rates 993 * [tlv] user-specified ie's 994 */ 995 m = ieee80211_getmgtframe(&frm, 996 2 + IEEE80211_NWID_LEN 997 + 2 + IEEE80211_RATE_SIZE 998 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 999 + (optie != NULL ? optielen : 0) 1000 ); 1001 if (m == NULL) { 1002 ic->ic_stats.is_tx_nobuf++; 1003 ieee80211_free_node(ni); 1004 return ENOMEM; 1005 } 1006 1007 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1008 mode = ieee80211_chan2mode(ic, ic->ic_curchan); 1009 frm = ieee80211_add_rates(frm, &ic->ic_sup_rates[mode]); 1010 frm = ieee80211_add_xrates(frm, &ic->ic_sup_rates[mode]); 1011 1012 if (optie != NULL) { 1013 memcpy(frm, optie, optielen); 1014 frm += optielen; 1015 } 1016 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1017 1018 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1019 if (m == NULL) 1020 return ENOMEM; 1021 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1022 m->m_pkthdr.rcvif = (void *)ni; 1023 1024 wh = mtod(m, struct ieee80211_frame *); 1025 ieee80211_send_setup(ic, ni, wh, 1026 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1027 sa, da, bssid); 1028 /* XXX power management? */ 1029 1030 IEEE80211_NODE_STAT(ni, tx_probereq); 1031 IEEE80211_NODE_STAT(ni, tx_mgmt); 1032 1033 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1034 "[%s] send probe req on channel %u\n", 1035 ether_sprintf(wh->i_addr1), 1036 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1037 1038 IF_ENQUEUE(&ic->ic_mgtq, m); 1039 if_start(ic->ic_ifp); 1040 return 0; 1041} 1042 1043/* 1044 * Send a management frame. The node is for the destination (or ic_bss 1045 * when in station mode). Nodes other than ic_bss have their reference 1046 * count bumped to reflect our use for an indeterminant time. 1047 */ 1048int 1049ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1050 int type, int arg) 1051{ 1052#define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1053 struct mbuf *m; 1054 u_int8_t *frm; 1055 u_int16_t capinfo; 1056 int has_challenge, is_shared_key, ret, timer, status; 1057 1058 KASSERT(ni != NULL, ("null node")); 1059 1060 /* 1061 * Hold a reference on the node so it doesn't go away until after 1062 * the xmit is complete all the way in the driver. On error we 1063 * will remove our reference. 1064 */ 1065 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1066 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1067 __func__, __LINE__, 1068 ni, ether_sprintf(ni->ni_macaddr), 1069 ieee80211_node_refcnt(ni)+1); 1070 ieee80211_ref_node(ni); 1071 1072 timer = 0; 1073 switch (type) { 1074 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1075 /* 1076 * probe response frame format 1077 * [8] time stamp 1078 * [2] beacon interval 1079 * [2] cabability information 1080 * [tlv] ssid 1081 * [tlv] supported rates 1082 * [tlv] parameter set (FH/DS) 1083 * [tlv] parameter set (IBSS) 1084 * [tlv] extended rate phy (ERP) 1085 * [tlv] extended supported rates 1086 * [tlv] WPA 1087 * [tlv] WME (optional) 1088 */ 1089 m = ieee80211_getmgtframe(&frm, 1090 8 1091 + sizeof(u_int16_t) 1092 + sizeof(u_int16_t) 1093 + 2 + IEEE80211_NWID_LEN 1094 + 2 + IEEE80211_RATE_SIZE 1095 + 7 /* max(7,3) */ 1096 + 6 1097 + 3 1098 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1099 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1100 + (ic->ic_flags & IEEE80211_F_WPA ? 1101 2*sizeof(struct ieee80211_ie_wpa) : 0) 1102 + sizeof(struct ieee80211_wme_param) 1103 ); 1104 if (m == NULL) 1105 senderr(ENOMEM, is_tx_nobuf); 1106 1107 memset(frm, 0, 8); /* timestamp should be filled later */ 1108 frm += 8; 1109 *(u_int16_t *)frm = htole16(ic->ic_bss->ni_intval); 1110 frm += 2; 1111 if (ic->ic_opmode == IEEE80211_M_IBSS) 1112 capinfo = IEEE80211_CAPINFO_IBSS; 1113 else 1114 capinfo = IEEE80211_CAPINFO_ESS; 1115 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1116 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1117 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1118 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1119 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1120 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1121 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1122 *(u_int16_t *)frm = htole16(capinfo); 1123 frm += 2; 1124 1125 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1126 ic->ic_bss->ni_esslen); 1127 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1128 1129 if (ic->ic_phytype == IEEE80211_T_FH) { 1130 *frm++ = IEEE80211_ELEMID_FHPARMS; 1131 *frm++ = 5; 1132 *frm++ = ni->ni_fhdwell & 0x00ff; 1133 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1134 *frm++ = IEEE80211_FH_CHANSET( 1135 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1136 *frm++ = IEEE80211_FH_CHANPAT( 1137 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1138 *frm++ = ni->ni_fhindex; 1139 } else { 1140 *frm++ = IEEE80211_ELEMID_DSPARMS; 1141 *frm++ = 1; 1142 *frm++ = ieee80211_chan2ieee(ic, ic->ic_curchan); 1143 } 1144 1145 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1146 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1147 *frm++ = 2; 1148 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1149 } 1150 if (ic->ic_flags & IEEE80211_F_WPA) 1151 frm = ieee80211_add_wpa(frm, ic); 1152 if (ic->ic_curmode == IEEE80211_MODE_11G) 1153 frm = ieee80211_add_erp(frm, ic); 1154 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1155 if (ic->ic_flags & IEEE80211_F_WME) 1156 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1157 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1158 break; 1159 1160 case IEEE80211_FC0_SUBTYPE_AUTH: 1161 status = arg >> 16; 1162 arg &= 0xffff; 1163 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1164 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1165 ni->ni_challenge != NULL); 1166 1167 /* 1168 * Deduce whether we're doing open authentication or 1169 * shared key authentication. We do the latter if 1170 * we're in the middle of a shared key authentication 1171 * handshake or if we're initiating an authentication 1172 * request and configured to use shared key. 1173 */ 1174 is_shared_key = has_challenge || 1175 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1176 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1177 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1178 1179 m = ieee80211_getmgtframe(&frm, 1180 3 * sizeof(u_int16_t) 1181 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1182 sizeof(u_int16_t)+IEEE80211_CHALLENGE_LEN : 0) 1183 ); 1184 if (m == NULL) 1185 senderr(ENOMEM, is_tx_nobuf); 1186 1187 ((u_int16_t *)frm)[0] = 1188 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1189 : htole16(IEEE80211_AUTH_ALG_OPEN); 1190 ((u_int16_t *)frm)[1] = htole16(arg); /* sequence number */ 1191 ((u_int16_t *)frm)[2] = htole16(status);/* status */ 1192 1193 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1194 ((u_int16_t *)frm)[3] = 1195 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1196 IEEE80211_ELEMID_CHALLENGE); 1197 memcpy(&((u_int16_t *)frm)[4], ni->ni_challenge, 1198 IEEE80211_CHALLENGE_LEN); 1199 m->m_pkthdr.len = m->m_len = 1200 4 * sizeof(u_int16_t) + IEEE80211_CHALLENGE_LEN; 1201 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1202 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1203 "[%s] request encrypt frame (%s)\n", 1204 ether_sprintf(ni->ni_macaddr), __func__); 1205 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1206 } 1207 } else 1208 m->m_pkthdr.len = m->m_len = 3 * sizeof(u_int16_t); 1209 1210 /* XXX not right for shared key */ 1211 if (status == IEEE80211_STATUS_SUCCESS) 1212 IEEE80211_NODE_STAT(ni, tx_auth); 1213 else 1214 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1215 1216 if (ic->ic_opmode == IEEE80211_M_STA) 1217 timer = IEEE80211_TRANS_WAIT; 1218 break; 1219 1220 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1221 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1222 "[%s] send station deauthenticate (reason %d)\n", 1223 ether_sprintf(ni->ni_macaddr), arg); 1224 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1225 if (m == NULL) 1226 senderr(ENOMEM, is_tx_nobuf); 1227 *(u_int16_t *)frm = htole16(arg); /* reason */ 1228 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1229 1230 IEEE80211_NODE_STAT(ni, tx_deauth); 1231 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1232 1233 ieee80211_node_unauthorize(ni); /* port closed */ 1234 break; 1235 1236 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1237 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1238 /* 1239 * asreq frame format 1240 * [2] capability information 1241 * [2] listen interval 1242 * [6*] current AP address (reassoc only) 1243 * [tlv] ssid 1244 * [tlv] supported rates 1245 * [tlv] extended supported rates 1246 * [tlv] WME 1247 * [tlv] user-specified ie's 1248 */ 1249 m = ieee80211_getmgtframe(&frm, 1250 sizeof(u_int16_t) 1251 + sizeof(u_int16_t) 1252 + IEEE80211_ADDR_LEN 1253 + 2 + IEEE80211_NWID_LEN 1254 + 2 + IEEE80211_RATE_SIZE 1255 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1256 + sizeof(struct ieee80211_wme_info) 1257 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 1258 ); 1259 if (m == NULL) 1260 senderr(ENOMEM, is_tx_nobuf); 1261 1262 capinfo = 0; 1263 if (ic->ic_opmode == IEEE80211_M_IBSS) 1264 capinfo |= IEEE80211_CAPINFO_IBSS; 1265 else /* IEEE80211_M_STA */ 1266 capinfo |= IEEE80211_CAPINFO_ESS; 1267 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1268 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1269 /* 1270 * NB: Some 11a AP's reject the request when 1271 * short premable is set. 1272 */ 1273 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1274 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1275 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1276 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) && 1277 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1278 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1279 *(u_int16_t *)frm = htole16(capinfo); 1280 frm += 2; 1281 1282 *(u_int16_t *)frm = htole16(ic->ic_lintval); 1283 frm += 2; 1284 1285 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1286 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 1287 frm += IEEE80211_ADDR_LEN; 1288 } 1289 1290 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1291 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1292 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1293 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1294 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1295 if (ic->ic_opt_ie != NULL) { 1296 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 1297 frm += ic->ic_opt_ie_len; 1298 } 1299 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1300 1301 timer = IEEE80211_TRANS_WAIT; 1302 break; 1303 1304 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1305 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1306 /* 1307 * asreq frame format 1308 * [2] capability information 1309 * [2] status 1310 * [2] association ID 1311 * [tlv] supported rates 1312 * [tlv] extended supported rates 1313 * [tlv] WME (if enabled and STA enabled) 1314 */ 1315 m = ieee80211_getmgtframe(&frm, 1316 sizeof(u_int16_t) 1317 + sizeof(u_int16_t) 1318 + sizeof(u_int16_t) 1319 + 2 + IEEE80211_RATE_SIZE 1320 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1321 + sizeof(struct ieee80211_wme_param) 1322 ); 1323 if (m == NULL) 1324 senderr(ENOMEM, is_tx_nobuf); 1325 1326 capinfo = IEEE80211_CAPINFO_ESS; 1327 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1328 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1329 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1330 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1331 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1332 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1333 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1334 *(u_int16_t *)frm = htole16(capinfo); 1335 frm += 2; 1336 1337 *(u_int16_t *)frm = htole16(arg); /* status */ 1338 frm += 2; 1339 1340 if (arg == IEEE80211_STATUS_SUCCESS) { 1341 *(u_int16_t *)frm = htole16(ni->ni_associd); 1342 IEEE80211_NODE_STAT(ni, tx_assoc); 1343 } else 1344 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1345 frm += 2; 1346 1347 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1348 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1349 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 1350 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1351 m->m_pkthdr.len = m->m_len = frm - mtod(m, u_int8_t *); 1352 break; 1353 1354 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1355 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 1356 "[%s] send station disassociate (reason %d)\n", 1357 ether_sprintf(ni->ni_macaddr), arg); 1358 m = ieee80211_getmgtframe(&frm, sizeof(u_int16_t)); 1359 if (m == NULL) 1360 senderr(ENOMEM, is_tx_nobuf); 1361 *(u_int16_t *)frm = htole16(arg); /* reason */ 1362 m->m_pkthdr.len = m->m_len = sizeof(u_int16_t); 1363 1364 IEEE80211_NODE_STAT(ni, tx_disassoc); 1365 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1366 break; 1367 1368 default: 1369 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1370 "[%s] invalid mgmt frame type %u\n", 1371 ether_sprintf(ni->ni_macaddr), type); 1372 senderr(EINVAL, is_tx_unknownmgt); 1373 /* NOTREACHED */ 1374 } 1375 ret = ieee80211_mgmt_output(ic, ni, m, type, timer); 1376 if (ret != 0) { 1377bad: 1378 ieee80211_free_node(ni); 1379 } 1380 return ret; 1381#undef senderr 1382} 1383 1384/* 1385 * Allocate a beacon frame and fillin the appropriate bits. 1386 */ 1387struct mbuf * 1388ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni, 1389 struct ieee80211_beacon_offsets *bo) 1390{ 1391 struct ifnet *ifp = ic->ic_ifp; 1392 struct ieee80211_frame *wh; 1393 struct mbuf *m; 1394 int pktlen; 1395 u_int8_t *frm, *efrm; 1396 u_int16_t capinfo; 1397 struct ieee80211_rateset *rs; 1398 1399 /* 1400 * beacon frame format 1401 * [8] time stamp 1402 * [2] beacon interval 1403 * [2] cabability information 1404 * [tlv] ssid 1405 * [tlv] supported rates 1406 * [3] parameter set (DS) 1407 * [tlv] parameter set (IBSS/TIM) 1408 * [tlv] extended rate phy (ERP) 1409 * [tlv] extended supported rates 1410 * [tlv] WME parameters 1411 * [tlv] WPA/RSN parameters 1412 * XXX Vendor-specific OIDs (e.g. Atheros) 1413 * NB: we allocate the max space required for the TIM bitmap. 1414 */ 1415 rs = &ni->ni_rates; 1416 pktlen = 8 /* time stamp */ 1417 + sizeof(u_int16_t) /* beacon interval */ 1418 + sizeof(u_int16_t) /* capabilities */ 1419 + 2 + ni->ni_esslen /* ssid */ 1420 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 1421 + 2 + 1 /* DS parameters */ 1422 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 1423 + 2 + 1 /* ERP */ 1424 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1425 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 1426 sizeof(struct ieee80211_wme_param) : 0) 1427 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 1428 2*sizeof(struct ieee80211_ie_wpa) : 0) 1429 ; 1430 m = ieee80211_getmgtframe(&frm, pktlen); 1431 if (m == NULL) { 1432 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1433 "%s: cannot get buf; size %u\n", __func__, pktlen); 1434 ic->ic_stats.is_tx_nobuf++; 1435 return NULL; 1436 } 1437 1438 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 1439 frm += 8; 1440 *(u_int16_t *)frm = htole16(ni->ni_intval); 1441 frm += 2; 1442 if (ic->ic_opmode == IEEE80211_M_IBSS) 1443 capinfo = IEEE80211_CAPINFO_IBSS; 1444 else 1445 capinfo = IEEE80211_CAPINFO_ESS; 1446 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1447 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1448 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1449 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1450 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1451 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1452 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1453 bo->bo_caps = (u_int16_t *)frm; 1454 *(u_int16_t *)frm = htole16(capinfo); 1455 frm += 2; 1456 *frm++ = IEEE80211_ELEMID_SSID; 1457 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 1458 *frm++ = ni->ni_esslen; 1459 memcpy(frm, ni->ni_essid, ni->ni_esslen); 1460 frm += ni->ni_esslen; 1461 } else 1462 *frm++ = 0; 1463 frm = ieee80211_add_rates(frm, rs); 1464 if (ic->ic_curmode != IEEE80211_MODE_FH) { 1465 *frm++ = IEEE80211_ELEMID_DSPARMS; 1466 *frm++ = 1; 1467 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 1468 } 1469 bo->bo_tim = frm; 1470 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1471 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1472 *frm++ = 2; 1473 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1474 bo->bo_tim_len = 0; 1475 } else { 1476 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 1477 1478 tie->tim_ie = IEEE80211_ELEMID_TIM; 1479 tie->tim_len = 4; /* length */ 1480 tie->tim_count = 0; /* DTIM count */ 1481 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 1482 tie->tim_bitctl = 0; /* bitmap control */ 1483 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 1484 frm += sizeof(struct ieee80211_tim_ie); 1485 bo->bo_tim_len = 1; 1486 } 1487 bo->bo_trailer = frm; 1488 if (ic->ic_flags & IEEE80211_F_WME) { 1489 bo->bo_wme = frm; 1490 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1491 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1492 } 1493 if (ic->ic_flags & IEEE80211_F_WPA) 1494 frm = ieee80211_add_wpa(frm, ic); 1495 if (ic->ic_curmode == IEEE80211_MODE_11G) { 1496 bo->bo_erp = frm; 1497 frm = ieee80211_add_erp(frm, ic); 1498 } 1499 efrm = ieee80211_add_xrates(frm, rs); 1500 bo->bo_trailer_len = efrm - bo->bo_trailer; 1501 m->m_pkthdr.len = m->m_len = efrm - mtod(m, u_int8_t *); 1502 1503 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1504 KASSERT(m != NULL, ("no space for 802.11 header?")); 1505 wh = mtod(m, struct ieee80211_frame *); 1506 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 1507 IEEE80211_FC0_SUBTYPE_BEACON; 1508 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1509 *(u_int16_t *)wh->i_dur = 0; 1510 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 1511 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 1512 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 1513 *(u_int16_t *)wh->i_seq = 0; 1514 1515 return m; 1516} 1517 1518/* 1519 * Update the dynamic parts of a beacon frame based on the current state. 1520 */ 1521int 1522ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni, 1523 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 1524{ 1525 int len_changed = 0; 1526 u_int16_t capinfo; 1527 1528 IEEE80211_BEACON_LOCK(ic); 1529 /* XXX faster to recalculate entirely or just changes? */ 1530 if (ic->ic_opmode == IEEE80211_M_IBSS) 1531 capinfo = IEEE80211_CAPINFO_IBSS; 1532 else 1533 capinfo = IEEE80211_CAPINFO_ESS; 1534 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1535 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1536 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1537 IEEE80211_IS_CHAN_2GHZ(ni->ni_chan)) 1538 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1539 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1540 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1541 *bo->bo_caps = htole16(capinfo); 1542 1543 if (ic->ic_flags & IEEE80211_F_WME) { 1544 struct ieee80211_wme_state *wme = &ic->ic_wme; 1545 1546 /* 1547 * Check for agressive mode change. When there is 1548 * significant high priority traffic in the BSS 1549 * throttle back BE traffic by using conservative 1550 * parameters. Otherwise BE uses agressive params 1551 * to optimize performance of legacy/non-QoS traffic. 1552 */ 1553 if (wme->wme_flags & WME_F_AGGRMODE) { 1554 if (wme->wme_hipri_traffic > 1555 wme->wme_hipri_switch_thresh) { 1556 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1557 "%s: traffic %u, disable aggressive mode\n", 1558 __func__, wme->wme_hipri_traffic); 1559 wme->wme_flags &= ~WME_F_AGGRMODE; 1560 ieee80211_wme_updateparams_locked(ic); 1561 wme->wme_hipri_traffic = 1562 wme->wme_hipri_switch_hysteresis; 1563 } else 1564 wme->wme_hipri_traffic = 0; 1565 } else { 1566 if (wme->wme_hipri_traffic <= 1567 wme->wme_hipri_switch_thresh) { 1568 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 1569 "%s: traffic %u, enable aggressive mode\n", 1570 __func__, wme->wme_hipri_traffic); 1571 wme->wme_flags |= WME_F_AGGRMODE; 1572 ieee80211_wme_updateparams_locked(ic); 1573 wme->wme_hipri_traffic = 0; 1574 } else 1575 wme->wme_hipri_traffic = 1576 wme->wme_hipri_switch_hysteresis; 1577 } 1578 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) { 1579 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 1580 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE; 1581 } 1582 } 1583 1584 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 1585 struct ieee80211_tim_ie *tie = 1586 (struct ieee80211_tim_ie *) bo->bo_tim; 1587 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) { 1588 u_int timlen, timoff, i; 1589 /* 1590 * ATIM/DTIM needs updating. If it fits in the 1591 * current space allocated then just copy in the 1592 * new bits. Otherwise we need to move any trailing 1593 * data to make room. Note that we know there is 1594 * contiguous space because ieee80211_beacon_allocate 1595 * insures there is space in the mbuf to write a 1596 * maximal-size virtual bitmap (based on ic_max_aid). 1597 */ 1598 /* 1599 * Calculate the bitmap size and offset, copy any 1600 * trailer out of the way, and then copy in the 1601 * new bitmap and update the information element. 1602 * Note that the tim bitmap must contain at least 1603 * one byte and any offset must be even. 1604 */ 1605 if (ic->ic_ps_pending != 0) { 1606 timoff = 128; /* impossibly large */ 1607 for (i = 0; i < ic->ic_tim_len; i++) 1608 if (ic->ic_tim_bitmap[i]) { 1609 timoff = i &~ 1; 1610 break; 1611 } 1612 KASSERT(timoff != 128, ("tim bitmap empty!")); 1613 for (i = ic->ic_tim_len-1; i >= timoff; i--) 1614 if (ic->ic_tim_bitmap[i]) 1615 break; 1616 timlen = 1 + (i - timoff); 1617 } else { 1618 timoff = 0; 1619 timlen = 1; 1620 } 1621 if (timlen != bo->bo_tim_len) { 1622 /* copy up/down trailer */ 1623 int adjust = tie->tim_bitmap+timlen 1624 - bo->bo_trailer; 1625 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust, 1626 bo->bo_trailer_len); 1627 bo->bo_trailer += adjust; 1628 bo->bo_wme += adjust; 1629 bo->bo_erp += adjust; 1630 bo->bo_tim_len = timlen; 1631 1632 /* update information element */ 1633 tie->tim_len = 3 + timlen; 1634 tie->tim_bitctl = timoff; 1635 len_changed = 1; 1636 } 1637 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 1638 bo->bo_tim_len); 1639 1640 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE; 1641 1642 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1643 "%s: TIM updated, pending %u, off %u, len %u\n", 1644 __func__, ic->ic_ps_pending, timoff, timlen); 1645 } 1646 /* count down DTIM period */ 1647 if (tie->tim_count == 0) 1648 tie->tim_count = tie->tim_period - 1; 1649 else 1650 tie->tim_count--; 1651 /* update state for buffered multicast frames on DTIM */ 1652 if (mcast && tie->tim_count == 0) 1653 tie->tim_bitctl |= 1; 1654 else 1655 tie->tim_bitctl &= ~1; 1656 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) { 1657 /* 1658 * ERP element needs updating. 1659 */ 1660 (void) ieee80211_add_erp(bo->bo_erp, ic); 1661 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE; 1662 } 1663 } 1664 IEEE80211_BEACON_UNLOCK(ic); 1665 1666 return len_changed; 1667} 1668 1669/* 1670 * Save an outbound packet for a node in power-save sleep state. 1671 * The new packet is placed on the node's saved queue, and the TIM 1672 * is changed, if necessary. 1673 */ 1674void 1675ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni, 1676 struct mbuf *m) 1677{ 1678 int qlen, age; 1679 1680 IEEE80211_NODE_SAVEQ_LOCK(ni); 1681 if (_IF_QFULL(&ni->ni_savedq)) { 1682 _IF_DROP(&ni->ni_savedq); 1683 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1684 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 1685 "[%s] pwr save q overflow, drops %d (size %d)\n", 1686 ether_sprintf(ni->ni_macaddr), 1687 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE); 1688#ifdef IEEE80211_DEBUG 1689 if (ieee80211_msg_dumppkts(ic)) 1690 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1); 1691#endif 1692 m_freem(m); 1693 return; 1694 } 1695 /* 1696 * Tag the frame with it's expiry time and insert 1697 * it in the queue. The aging interval is 4 times 1698 * the listen interval specified by the station. 1699 * Frames that sit around too long are reclaimed 1700 * using this information. 1701 */ 1702 /* XXX handle overflow? */ 1703 age = ((ni->ni_intval * ic->ic_bintval) << 2) / 1024; /* TU -> secs */ 1704 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age); 1705 IEEE80211_NODE_SAVEQ_UNLOCK(ni); 1706 1707 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 1708 "[%s] save frame with age %d, %u now queued\n", 1709 ether_sprintf(ni->ni_macaddr), age, qlen); 1710 1711 if (qlen == 1) 1712 ic->ic_set_tim(ni, 1); 1713} 1714