ieee80211_output.c revision 191148
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 191148 2009-04-16 20:30:28Z kmacy $"); 29 30#include "opt_inet.h" 31#include "opt_wlan.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/mbuf.h> 36#include <sys/kernel.h> 37#include <sys/endian.h> 38 39#include <sys/socket.h> 40 41#include <net/bpf.h> 42#include <net/ethernet.h> 43#include <net/if.h> 44#include <net/if_llc.h> 45#include <net/if_media.h> 46#include <net/if_vlan_var.h> 47 48#include <net80211/ieee80211_var.h> 49#include <net80211/ieee80211_regdomain.h> 50#ifdef IEEE80211_SUPPORT_SUPERG 51#include <net80211/ieee80211_superg.h> 52#endif 53#ifdef IEEE80211_SUPPORT_TDMA 54#include <net80211/ieee80211_tdma.h> 55#endif 56#include <net80211/ieee80211_wds.h> 57 58#ifdef INET 59#include <netinet/in.h> 60#include <netinet/if_ether.h> 61#include <netinet/in_systm.h> 62#include <netinet/ip.h> 63#endif 64 65#define ETHER_HEADER_COPY(dst, src) \ 66 memcpy(dst, src, sizeof(struct ether_header)) 67 68static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 69 u_int hdrsize, u_int ciphdrsize, u_int mtu); 70static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 71 72#ifdef IEEE80211_DEBUG 73/* 74 * Decide if an outbound management frame should be 75 * printed when debugging is enabled. This filters some 76 * of the less interesting frames that come frequently 77 * (e.g. beacons). 78 */ 79static __inline int 80doprint(struct ieee80211vap *vap, int subtype) 81{ 82 switch (subtype) { 83 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 84 return (vap->iv_opmode == IEEE80211_M_IBSS); 85 } 86 return 1; 87} 88#endif 89 90/* 91 * Start method for vap's. All packets from the stack come 92 * through here. We handle common processing of the packets 93 * before dispatching them to the underlying device. 94 */ 95void 96ieee80211_start(struct ifnet *ifp) 97{ 98#define IS_DWDS(vap) \ 99 (vap->iv_opmode == IEEE80211_M_WDS && \ 100 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 101 struct ieee80211vap *vap = ifp->if_softc; 102 struct ieee80211com *ic = vap->iv_ic; 103 struct ifnet *parent = ic->ic_ifp; 104 struct ieee80211_node *ni; 105 struct mbuf *m; 106 struct ether_header *eh; 107 int error; 108 109 /* NB: parent must be up and running */ 110 if (!IFNET_IS_UP_RUNNING(parent)) { 111 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 112 "%s: ignore queue, parent %s not up+running\n", 113 __func__, parent->if_xname); 114 /* XXX stat */ 115 return; 116 } 117 if (vap->iv_state == IEEE80211_S_SLEEP) { 118 /* 119 * In power save, wakeup device for transmit. 120 */ 121 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 122 return; 123 } 124 /* 125 * No data frames go out unless we're running. 126 * Note in particular this covers CAC and CSA 127 * states (though maybe we should check muting 128 * for CSA). 129 */ 130 if (vap->iv_state != IEEE80211_S_RUN) { 131 IEEE80211_LOCK(ic); 132 /* re-check under the com lock to avoid races */ 133 if (vap->iv_state != IEEE80211_S_RUN) { 134 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 135 "%s: ignore queue, in %s state\n", 136 __func__, ieee80211_state_name[vap->iv_state]); 137 vap->iv_stats.is_tx_badstate++; 138 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 139 IEEE80211_UNLOCK(ic); 140 return; 141 } 142 IEEE80211_UNLOCK(ic); 143 } 144 for (;;) { 145 IFQ_DEQUEUE(&ifp->if_snd, m); 146 if (m == NULL) 147 break; 148 /* 149 * Sanitize mbuf flags for net80211 use. We cannot 150 * clear M_PWR_SAV because this may be set for frames 151 * that are re-submitted from the power save queue. 152 * 153 * NB: This must be done before ieee80211_classify as 154 * it marks EAPOL in frames with M_EAPOL. 155 */ 156 m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 157 /* 158 * Cancel any background scan. 159 */ 160 if (ic->ic_flags & IEEE80211_F_SCAN) 161 ieee80211_cancel_anyscan(vap); 162 /* 163 * Find the node for the destination so we can do 164 * things like power save and fast frames aggregation. 165 * 166 * NB: past this point various code assumes the first 167 * mbuf has the 802.3 header present (and contiguous). 168 */ 169 ni = NULL; 170 if (m->m_len < sizeof(struct ether_header) && 171 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 172 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 173 "discard frame, %s\n", "m_pullup failed"); 174 vap->iv_stats.is_tx_nobuf++; /* XXX */ 175 ifp->if_oerrors++; 176 continue; 177 } 178 eh = mtod(m, struct ether_header *); 179 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 180 if (IS_DWDS(vap)) { 181 /* 182 * Only unicast frames from the above go out 183 * DWDS vaps; multicast frames are handled by 184 * dispatching the frame as it comes through 185 * the AP vap (see below). 186 */ 187 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 188 eh->ether_dhost, "mcast", "%s", "on DWDS"); 189 vap->iv_stats.is_dwds_mcast++; 190 m_freem(m); 191 continue; 192 } 193 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 194 /* 195 * Spam DWDS vap's w/ multicast traffic. 196 */ 197 /* XXX only if dwds in use? */ 198 ieee80211_dwds_mcast(vap, m); 199 } 200 } 201 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 202 if (ni == NULL) { 203 /* NB: ieee80211_find_txnode does stat+msg */ 204 ifp->if_oerrors++; 205 m_freem(m); 206 continue; 207 } 208 if (ni->ni_associd == 0 && 209 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 211 eh->ether_dhost, NULL, 212 "sta not associated (type 0x%04x)", 213 htons(eh->ether_type)); 214 vap->iv_stats.is_tx_notassoc++; 215 ifp->if_oerrors++; 216 m_freem(m); 217 ieee80211_free_node(ni); 218 continue; 219 } 220 221 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 222 (m->m_flags & M_PWR_SAV) == 0) { 223 /* 224 * Station in power save mode; pass the frame 225 * to the 802.11 layer and continue. We'll get 226 * the frame back when the time is right. 227 * XXX lose WDS vap linkage? 228 */ 229 (void) ieee80211_pwrsave(ni, m); 230 ieee80211_free_node(ni); 231 continue; 232 } 233 /* calculate priority so drivers can find the tx queue */ 234 if (ieee80211_classify(ni, m)) { 235 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 236 eh->ether_dhost, NULL, 237 "%s", "classification failure"); 238 vap->iv_stats.is_tx_classify++; 239 ifp->if_oerrors++; 240 m_freem(m); 241 ieee80211_free_node(ni); 242 continue; 243 } 244 245 BPF_MTAP(ifp, m); /* 802.3 tx */ 246 247#ifdef IEEE80211_SUPPORT_SUPERG 248 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 249 m = ieee80211_ff_check(ni, m); 250 if (m == NULL) { 251 /* NB: any ni ref held on stageq */ 252 continue; 253 } 254 } 255#endif /* IEEE80211_SUPPORT_SUPERG */ 256 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 257 /* 258 * Encapsulate the packet in prep for transmission. 259 */ 260 m = ieee80211_encap(vap, ni, m); 261 if (m == NULL) { 262 /* NB: stat+msg handled in ieee80211_encap */ 263 ieee80211_free_node(ni); 264 continue; 265 } 266 } 267 268 /* 269 * Stash the node pointer and hand the frame off to 270 * the underlying device. Note that we do this after 271 * any call to ieee80211_dwds_mcast because that code 272 * uses any existing value for rcvif. 273 */ 274 m->m_pkthdr.rcvif = (void *)ni; 275 276 error = parent->if_transmit(parent, m); 277 if (error != 0) { 278 /* NB: IFQ_HANDOFF reclaims mbuf */ 279 ieee80211_free_node(ni); 280 } else { 281 ifp->if_opackets++; 282 } 283 ic->ic_lastdata = ticks; 284 } 285#undef IS_DWDS 286} 287 288/* 289 * 802.11 output routine. This is (currently) used only to 290 * connect bpf write calls to the 802.11 layer for injecting 291 * raw 802.11 frames. Note we locate the ieee80211com from 292 * the ifnet using a spare field setup at attach time. This 293 * will go away when the virtual ap support comes in. 294 */ 295int 296ieee80211_output(struct ifnet *ifp, struct mbuf *m, 297 struct sockaddr *dst, struct route *ro) 298{ 299#define senderr(e) do { error = (e); goto bad;} while (0) 300 struct ieee80211_node *ni = NULL; 301 struct ieee80211vap *vap; 302 struct ieee80211_frame *wh; 303 int error; 304 305 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 306 /* 307 * Short-circuit requests if the vap is marked OACTIVE 308 * as this is used when tearing down state to indicate 309 * the vap may be gone. This can also happen because a 310 * packet came down through ieee80211_start before the 311 * vap entered RUN state in which case it's also ok to 312 * just drop the frame. This should not be necessary 313 * but callers of if_output don't check OACTIVE. 314 */ 315 senderr(ENETDOWN); 316 } 317 vap = ifp->if_softc; 318 /* 319 * Hand to the 802.3 code if not tagged as 320 * a raw 802.11 frame. 321 */ 322 if (dst->sa_family != AF_IEEE80211) 323 return vap->iv_output(ifp, m, dst, ro); 324#ifdef MAC 325 error = mac_check_ifnet_transmit(ifp, m); 326 if (error) 327 senderr(error); 328#endif 329 if (ifp->if_flags & IFF_MONITOR) 330 senderr(ENETDOWN); 331 if (!IFNET_IS_UP_RUNNING(ifp)) 332 senderr(ENETDOWN); 333 if (vap->iv_state == IEEE80211_S_CAC) { 334 IEEE80211_DPRINTF(vap, 335 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 336 "block %s frame in CAC state\n", "raw data"); 337 vap->iv_stats.is_tx_badstate++; 338 senderr(EIO); /* XXX */ 339 } 340 /* XXX bypass bridge, pfil, carp, etc. */ 341 342 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 343 senderr(EIO); /* XXX */ 344 wh = mtod(m, struct ieee80211_frame *); 345 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 346 IEEE80211_FC0_VERSION_0) 347 senderr(EIO); /* XXX */ 348 349 /* locate destination node */ 350 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 351 case IEEE80211_FC1_DIR_NODS: 352 case IEEE80211_FC1_DIR_FROMDS: 353 ni = ieee80211_find_txnode(vap, wh->i_addr1); 354 break; 355 case IEEE80211_FC1_DIR_TODS: 356 case IEEE80211_FC1_DIR_DSTODS: 357 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 358 senderr(EIO); /* XXX */ 359 ni = ieee80211_find_txnode(vap, wh->i_addr3); 360 break; 361 default: 362 senderr(EIO); /* XXX */ 363 } 364 if (ni == NULL) { 365 /* 366 * Permit packets w/ bpf params through regardless 367 * (see below about sa_len). 368 */ 369 if (dst->sa_len == 0) 370 senderr(EHOSTUNREACH); 371 ni = ieee80211_ref_node(vap->iv_bss); 372 } 373 374 /* 375 * Sanitize mbuf for net80211 flags leaked from above. 376 * 377 * NB: This must be done before ieee80211_classify as 378 * it marks EAPOL in frames with M_EAPOL. 379 */ 380 m->m_flags &= ~M_80211_TX; 381 382 /* calculate priority so drivers can find the tx queue */ 383 /* XXX assumes an 802.3 frame */ 384 if (ieee80211_classify(ni, m)) 385 senderr(EIO); /* XXX */ 386 387 BPF_MTAP(ifp, m); 388 389 /* 390 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 391 * present by setting the sa_len field of the sockaddr (yes, 392 * this is a hack). 393 * NB: we assume sa_data is suitably aligned to cast. 394 */ 395 return vap->iv_ic->ic_raw_xmit(ni, m, 396 (const struct ieee80211_bpf_params *)(dst->sa_len ? 397 dst->sa_data : NULL)); 398bad: 399 if (m != NULL) 400 m_freem(m); 401 if (ni != NULL) 402 ieee80211_free_node(ni); 403 return error; 404#undef senderr 405} 406 407/* 408 * Set the direction field and address fields of an outgoing 409 * frame. Note this should be called early on in constructing 410 * a frame as it sets i_fc[1]; other bits can then be or'd in. 411 */ 412static void 413ieee80211_send_setup( 414 struct ieee80211_node *ni, 415 struct ieee80211_frame *wh, 416 int type, int tid, 417 const uint8_t sa[IEEE80211_ADDR_LEN], 418 const uint8_t da[IEEE80211_ADDR_LEN], 419 const uint8_t bssid[IEEE80211_ADDR_LEN]) 420{ 421#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 422 423 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 424 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 425 struct ieee80211vap *vap = ni->ni_vap; 426 427 switch (vap->iv_opmode) { 428 case IEEE80211_M_STA: 429 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 430 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 431 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 432 IEEE80211_ADDR_COPY(wh->i_addr3, da); 433 break; 434 case IEEE80211_M_IBSS: 435 case IEEE80211_M_AHDEMO: 436 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 437 IEEE80211_ADDR_COPY(wh->i_addr1, da); 438 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 439 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 440 break; 441 case IEEE80211_M_HOSTAP: 442 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 443 IEEE80211_ADDR_COPY(wh->i_addr1, da); 444 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 445 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 446 break; 447 case IEEE80211_M_WDS: 448 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 449 IEEE80211_ADDR_COPY(wh->i_addr1, da); 450 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 451 IEEE80211_ADDR_COPY(wh->i_addr3, da); 452 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 453 break; 454 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 455 break; 456 } 457 } else { 458 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 459 IEEE80211_ADDR_COPY(wh->i_addr1, da); 460 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 461 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 462 } 463 *(uint16_t *)&wh->i_dur[0] = 0; 464 *(uint16_t *)&wh->i_seq[0] = 465 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 466 ni->ni_txseqs[tid]++; 467#undef WH4 468} 469 470/* 471 * Send a management frame to the specified node. The node pointer 472 * must have a reference as the pointer will be passed to the driver 473 * and potentially held for a long time. If the frame is successfully 474 * dispatched to the driver, then it is responsible for freeing the 475 * reference (and potentially free'ing up any associated storage); 476 * otherwise deal with reclaiming any reference (on error). 477 */ 478int 479ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 480 struct ieee80211_bpf_params *params) 481{ 482 struct ieee80211vap *vap = ni->ni_vap; 483 struct ieee80211com *ic = ni->ni_ic; 484 struct ieee80211_frame *wh; 485 486 KASSERT(ni != NULL, ("null node")); 487 488 if (vap->iv_state == IEEE80211_S_CAC) { 489 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 490 ni, "block %s frame in CAC state", 491 ieee80211_mgt_subtype_name[ 492 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 493 IEEE80211_FC0_SUBTYPE_SHIFT]); 494 vap->iv_stats.is_tx_badstate++; 495 ieee80211_free_node(ni); 496 m_freem(m); 497 return EIO; /* XXX */ 498 } 499 500 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 501 if (m == NULL) { 502 ieee80211_free_node(ni); 503 return ENOMEM; 504 } 505 506 wh = mtod(m, struct ieee80211_frame *); 507 ieee80211_send_setup(ni, wh, 508 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 509 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 510 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 511 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 512 "encrypting frame (%s)", __func__); 513 wh->i_fc[1] |= IEEE80211_FC1_WEP; 514 } 515 m->m_flags |= M_ENCAP; /* mark encapsulated */ 516 517 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 518 M_WME_SETAC(m, params->ibp_pri); 519 520#ifdef IEEE80211_DEBUG 521 /* avoid printing too many frames */ 522 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 523 ieee80211_msg_dumppkts(vap)) { 524 printf("[%s] send %s on channel %u\n", 525 ether_sprintf(wh->i_addr1), 526 ieee80211_mgt_subtype_name[ 527 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 528 IEEE80211_FC0_SUBTYPE_SHIFT], 529 ieee80211_chan2ieee(ic, ic->ic_curchan)); 530 } 531#endif 532 IEEE80211_NODE_STAT(ni, tx_mgmt); 533 534 return ic->ic_raw_xmit(ni, m, params); 535} 536 537/* 538 * Send a null data frame to the specified node. If the station 539 * is setup for QoS then a QoS Null Data frame is constructed. 540 * If this is a WDS station then a 4-address frame is constructed. 541 * 542 * NB: the caller is assumed to have setup a node reference 543 * for use; this is necessary to deal with a race condition 544 * when probing for inactive stations. Like ieee80211_mgmt_output 545 * we must cleanup any node reference on error; however we 546 * can safely just unref it as we know it will never be the 547 * last reference to the node. 548 */ 549int 550ieee80211_send_nulldata(struct ieee80211_node *ni) 551{ 552 struct ieee80211vap *vap = ni->ni_vap; 553 struct ieee80211com *ic = ni->ni_ic; 554 struct mbuf *m; 555 struct ieee80211_frame *wh; 556 int hdrlen; 557 uint8_t *frm; 558 559 if (vap->iv_state == IEEE80211_S_CAC) { 560 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 561 ni, "block %s frame in CAC state", "null data"); 562 ieee80211_unref_node(&ni); 563 vap->iv_stats.is_tx_badstate++; 564 return EIO; /* XXX */ 565 } 566 567 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 568 hdrlen = sizeof(struct ieee80211_qosframe); 569 else 570 hdrlen = sizeof(struct ieee80211_frame); 571 /* NB: only WDS vap's get 4-address frames */ 572 if (vap->iv_opmode == IEEE80211_M_WDS) 573 hdrlen += IEEE80211_ADDR_LEN; 574 if (ic->ic_flags & IEEE80211_F_DATAPAD) 575 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 576 577 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 578 if (m == NULL) { 579 /* XXX debug msg */ 580 ieee80211_unref_node(&ni); 581 vap->iv_stats.is_tx_nobuf++; 582 return ENOMEM; 583 } 584 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 585 ("leading space %zd", M_LEADINGSPACE(m))); 586 M_PREPEND(m, hdrlen, M_DONTWAIT); 587 if (m == NULL) { 588 /* NB: cannot happen */ 589 ieee80211_free_node(ni); 590 return ENOMEM; 591 } 592 593 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 594 if (ni->ni_flags & IEEE80211_NODE_QOS) { 595 const int tid = WME_AC_TO_TID(WME_AC_BE); 596 uint8_t *qos; 597 598 ieee80211_send_setup(ni, wh, 599 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 600 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 601 602 if (vap->iv_opmode == IEEE80211_M_WDS) 603 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 604 else 605 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 606 qos[0] = tid & IEEE80211_QOS_TID; 607 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 608 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 609 qos[1] = 0; 610 } else { 611 ieee80211_send_setup(ni, wh, 612 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 613 IEEE80211_NONQOS_TID, 614 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 615 } 616 if (vap->iv_opmode != IEEE80211_M_WDS) { 617 /* NB: power management bit is never sent by an AP */ 618 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 619 vap->iv_opmode != IEEE80211_M_HOSTAP) 620 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 621 } 622 m->m_len = m->m_pkthdr.len = hdrlen; 623 m->m_flags |= M_ENCAP; /* mark encapsulated */ 624 625 M_WME_SETAC(m, WME_AC_BE); 626 627 IEEE80211_NODE_STAT(ni, tx_data); 628 629 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 630 "send %snull data frame on channel %u, pwr mgt %s", 631 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 632 ieee80211_chan2ieee(ic, ic->ic_curchan), 633 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 634 635 return ic->ic_raw_xmit(ni, m, NULL); 636} 637 638/* 639 * Assign priority to a frame based on any vlan tag assigned 640 * to the station and/or any Diffserv setting in an IP header. 641 * Finally, if an ACM policy is setup (in station mode) it's 642 * applied. 643 */ 644int 645ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 646{ 647 const struct ether_header *eh = mtod(m, struct ether_header *); 648 int v_wme_ac, d_wme_ac, ac; 649 650 /* 651 * Always promote PAE/EAPOL frames to high priority. 652 */ 653 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 654 /* NB: mark so others don't need to check header */ 655 m->m_flags |= M_EAPOL; 656 ac = WME_AC_VO; 657 goto done; 658 } 659 /* 660 * Non-qos traffic goes to BE. 661 */ 662 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 663 ac = WME_AC_BE; 664 goto done; 665 } 666 667 /* 668 * If node has a vlan tag then all traffic 669 * to it must have a matching tag. 670 */ 671 v_wme_ac = 0; 672 if (ni->ni_vlan != 0) { 673 if ((m->m_flags & M_VLANTAG) == 0) { 674 IEEE80211_NODE_STAT(ni, tx_novlantag); 675 return 1; 676 } 677 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 678 EVL_VLANOFTAG(ni->ni_vlan)) { 679 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 680 return 1; 681 } 682 /* map vlan priority to AC */ 683 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 684 } 685 686#ifdef INET 687 if (eh->ether_type == htons(ETHERTYPE_IP)) { 688 uint8_t tos; 689 /* 690 * IP frame, map the DSCP bits from the TOS field. 691 */ 692 /* XXX m_copydata may be too slow for fast path */ 693 /* NB: ip header may not be in first mbuf */ 694 m_copydata(m, sizeof(struct ether_header) + 695 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 696 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 697 d_wme_ac = TID_TO_WME_AC(tos); 698 } else { 699#endif /* INET */ 700 d_wme_ac = WME_AC_BE; 701#ifdef INET 702 } 703#endif 704 /* 705 * Use highest priority AC. 706 */ 707 if (v_wme_ac > d_wme_ac) 708 ac = v_wme_ac; 709 else 710 ac = d_wme_ac; 711 712 /* 713 * Apply ACM policy. 714 */ 715 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 716 static const int acmap[4] = { 717 WME_AC_BK, /* WME_AC_BE */ 718 WME_AC_BK, /* WME_AC_BK */ 719 WME_AC_BE, /* WME_AC_VI */ 720 WME_AC_VI, /* WME_AC_VO */ 721 }; 722 struct ieee80211com *ic = ni->ni_ic; 723 724 while (ac != WME_AC_BK && 725 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 726 ac = acmap[ac]; 727 } 728done: 729 M_WME_SETAC(m, ac); 730 return 0; 731} 732 733/* 734 * Insure there is sufficient contiguous space to encapsulate the 735 * 802.11 data frame. If room isn't already there, arrange for it. 736 * Drivers and cipher modules assume we have done the necessary work 737 * and fail rudely if they don't find the space they need. 738 */ 739struct mbuf * 740ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 741 struct ieee80211_key *key, struct mbuf *m) 742{ 743#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 744 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 745 746 if (key != NULL) { 747 /* XXX belongs in crypto code? */ 748 needed_space += key->wk_cipher->ic_header; 749 /* XXX frags */ 750 /* 751 * When crypto is being done in the host we must insure 752 * the data are writable for the cipher routines; clone 753 * a writable mbuf chain. 754 * XXX handle SWMIC specially 755 */ 756 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 757 m = m_unshare(m, M_NOWAIT); 758 if (m == NULL) { 759 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 760 "%s: cannot get writable mbuf\n", __func__); 761 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 762 return NULL; 763 } 764 } 765 } 766 /* 767 * We know we are called just before stripping an Ethernet 768 * header and prepending an LLC header. This means we know 769 * there will be 770 * sizeof(struct ether_header) - sizeof(struct llc) 771 * bytes recovered to which we need additional space for the 772 * 802.11 header and any crypto header. 773 */ 774 /* XXX check trailing space and copy instead? */ 775 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 776 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 777 if (n == NULL) { 778 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 779 "%s: cannot expand storage\n", __func__); 780 vap->iv_stats.is_tx_nobuf++; 781 m_freem(m); 782 return NULL; 783 } 784 KASSERT(needed_space <= MHLEN, 785 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 786 /* 787 * Setup new mbuf to have leading space to prepend the 788 * 802.11 header and any crypto header bits that are 789 * required (the latter are added when the driver calls 790 * back to ieee80211_crypto_encap to do crypto encapsulation). 791 */ 792 /* NB: must be first 'cuz it clobbers m_data */ 793 m_move_pkthdr(n, m); 794 n->m_len = 0; /* NB: m_gethdr does not set */ 795 n->m_data += needed_space; 796 /* 797 * Pull up Ethernet header to create the expected layout. 798 * We could use m_pullup but that's overkill (i.e. we don't 799 * need the actual data) and it cannot fail so do it inline 800 * for speed. 801 */ 802 /* NB: struct ether_header is known to be contiguous */ 803 n->m_len += sizeof(struct ether_header); 804 m->m_len -= sizeof(struct ether_header); 805 m->m_data += sizeof(struct ether_header); 806 /* 807 * Replace the head of the chain. 808 */ 809 n->m_next = m; 810 m = n; 811 } 812 return m; 813#undef TO_BE_RECLAIMED 814} 815 816/* 817 * Return the transmit key to use in sending a unicast frame. 818 * If a unicast key is set we use that. When no unicast key is set 819 * we fall back to the default transmit key. 820 */ 821static __inline struct ieee80211_key * 822ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 823 struct ieee80211_node *ni) 824{ 825 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 826 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 827 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 828 return NULL; 829 return &vap->iv_nw_keys[vap->iv_def_txkey]; 830 } else { 831 return &ni->ni_ucastkey; 832 } 833} 834 835/* 836 * Return the transmit key to use in sending a multicast frame. 837 * Multicast traffic always uses the group key which is installed as 838 * the default tx key. 839 */ 840static __inline struct ieee80211_key * 841ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 842 struct ieee80211_node *ni) 843{ 844 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 845 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 846 return NULL; 847 return &vap->iv_nw_keys[vap->iv_def_txkey]; 848} 849 850/* 851 * Encapsulate an outbound data frame. The mbuf chain is updated. 852 * If an error is encountered NULL is returned. The caller is required 853 * to provide a node reference and pullup the ethernet header in the 854 * first mbuf. 855 * 856 * NB: Packet is assumed to be processed by ieee80211_classify which 857 * marked EAPOL frames w/ M_EAPOL. 858 */ 859struct mbuf * 860ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 861 struct mbuf *m) 862{ 863#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 864 struct ieee80211com *ic = ni->ni_ic; 865 struct ether_header eh; 866 struct ieee80211_frame *wh; 867 struct ieee80211_key *key; 868 struct llc *llc; 869 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 870 871 /* 872 * Copy existing Ethernet header to a safe place. The 873 * rest of the code assumes it's ok to strip it when 874 * reorganizing state for the final encapsulation. 875 */ 876 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 877 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 878 879 /* 880 * Insure space for additional headers. First identify 881 * transmit key to use in calculating any buffer adjustments 882 * required. This is also used below to do privacy 883 * encapsulation work. Then calculate the 802.11 header 884 * size and any padding required by the driver. 885 * 886 * Note key may be NULL if we fall back to the default 887 * transmit key and that is not set. In that case the 888 * buffer may not be expanded as needed by the cipher 889 * routines, but they will/should discard it. 890 */ 891 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 892 if (vap->iv_opmode == IEEE80211_M_STA || 893 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 894 (vap->iv_opmode == IEEE80211_M_WDS && 895 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 896 key = ieee80211_crypto_getucastkey(vap, ni); 897 else 898 key = ieee80211_crypto_getmcastkey(vap, ni); 899 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 900 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 901 eh.ether_dhost, 902 "no default transmit key (%s) deftxkey %u", 903 __func__, vap->iv_def_txkey); 904 vap->iv_stats.is_tx_nodefkey++; 905 goto bad; 906 } 907 } else 908 key = NULL; 909 /* 910 * XXX Some ap's don't handle QoS-encapsulated EAPOL 911 * frames so suppress use. This may be an issue if other 912 * ap's require all data frames to be QoS-encapsulated 913 * once negotiated in which case we'll need to make this 914 * configurable. 915 */ 916 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 917 (m->m_flags & M_EAPOL) == 0; 918 if (addqos) 919 hdrsize = sizeof(struct ieee80211_qosframe); 920 else 921 hdrsize = sizeof(struct ieee80211_frame); 922 /* 923 * 4-address frames need to be generated for: 924 * o packets sent through a WDS vap (IEEE80211_M_WDS) 925 * o packets relayed by a station operating with dynamic WDS 926 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 927 */ 928 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 929 (vap->iv_opmode == IEEE80211_M_STA && 930 (vap->iv_flags & IEEE80211_F_DWDS) && 931 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 932 if (is4addr) 933 hdrsize += IEEE80211_ADDR_LEN; 934 /* 935 * Honor driver DATAPAD requirement. 936 */ 937 if (ic->ic_flags & IEEE80211_F_DATAPAD) 938 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 939 else 940 hdrspace = hdrsize; 941 942 if (__predict_true((m->m_flags & M_FF) == 0)) { 943 /* 944 * Normal frame. 945 */ 946 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 947 if (m == NULL) { 948 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 949 goto bad; 950 } 951 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 952 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 953 llc = mtod(m, struct llc *); 954 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 955 llc->llc_control = LLC_UI; 956 llc->llc_snap.org_code[0] = 0; 957 llc->llc_snap.org_code[1] = 0; 958 llc->llc_snap.org_code[2] = 0; 959 llc->llc_snap.ether_type = eh.ether_type; 960 } else { 961#ifdef IEEE80211_SUPPORT_SUPERG 962 /* 963 * Aggregated frame. 964 */ 965 m = ieee80211_ff_encap(vap, m, hdrspace, key); 966 if (m == NULL) 967#endif 968 goto bad; 969 } 970 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 971 972 M_PREPEND(m, hdrspace, M_DONTWAIT); 973 if (m == NULL) { 974 vap->iv_stats.is_tx_nobuf++; 975 goto bad; 976 } 977 wh = mtod(m, struct ieee80211_frame *); 978 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 979 *(uint16_t *)wh->i_dur = 0; 980 if (is4addr) { 981 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 982 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 983 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 984 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 985 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 986 } else switch (vap->iv_opmode) { 987 case IEEE80211_M_STA: 988 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 989 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 990 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 991 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 992 break; 993 case IEEE80211_M_IBSS: 994 case IEEE80211_M_AHDEMO: 995 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 996 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 997 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 998 /* 999 * NB: always use the bssid from iv_bss as the 1000 * neighbor's may be stale after an ibss merge 1001 */ 1002 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1003 break; 1004 case IEEE80211_M_HOSTAP: 1005 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1006 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1007 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1008 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1009 break; 1010 case IEEE80211_M_MONITOR: 1011 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1012 goto bad; 1013 } 1014 if (m->m_flags & M_MORE_DATA) 1015 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1016 if (addqos) { 1017 uint8_t *qos; 1018 int ac, tid; 1019 1020 if (is4addr) { 1021 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1022 } else 1023 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1024 ac = M_WME_GETAC(m); 1025 /* map from access class/queue to 11e header priorty value */ 1026 tid = WME_AC_TO_TID(ac); 1027 qos[0] = tid & IEEE80211_QOS_TID; 1028 /* 1029 * Check if A-MPDU tx aggregation is setup or if we 1030 * should try to enable it. The sta must be associated 1031 * with HT and A-MPDU enabled for use. When the policy 1032 * routine decides we should enable A-MPDU we issue an 1033 * ADDBA request and wait for a reply. The frame being 1034 * encapsulated will go out w/o using A-MPDU, or possibly 1035 * it might be collected by the driver and held/retransmit. 1036 * The default ic_ampdu_enable routine handles staggering 1037 * ADDBA requests in case the receiver NAK's us or we are 1038 * otherwise unable to establish a BA stream. 1039 */ 1040 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1041 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1042 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1043 1044 ieee80211_txampdu_count_packet(tap); 1045 if (IEEE80211_AMPDU_RUNNING(tap)) { 1046 /* 1047 * Operational, mark frame for aggregation. 1048 * 1049 * NB: We support only immediate BA's for 1050 * AMPDU which means we set the QoS control 1051 * field to "normal ack" (0) to get "implicit 1052 * block ack" behaviour. 1053 */ 1054 m->m_flags |= M_AMPDU_MPDU; 1055 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1056 ic->ic_ampdu_enable(ni, tap)) { 1057 /* 1058 * Not negotiated yet, request service. 1059 */ 1060 ieee80211_ampdu_request(ni, tap); 1061 } 1062 } 1063 /* XXX works even when BA marked above */ 1064 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1065 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1066 qos[1] = 0; 1067 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1068 1069 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1070 /* 1071 * NB: don't assign a sequence # to potential 1072 * aggregates; we expect this happens at the 1073 * point the frame comes off any aggregation q 1074 * as otherwise we may introduce holes in the 1075 * BA sequence space and/or make window accouting 1076 * more difficult. 1077 * 1078 * XXX may want to control this with a driver 1079 * capability; this may also change when we pull 1080 * aggregation up into net80211 1081 */ 1082 *(uint16_t *)wh->i_seq = 1083 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1084 ni->ni_txseqs[tid]++; 1085 } 1086 } else { 1087 *(uint16_t *)wh->i_seq = 1088 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1089 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1090 } 1091 /* check if xmit fragmentation is required */ 1092 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1093 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1094 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1095 (m->m_flags & M_FF) == 0); /* NB: don't fragment ff's */ 1096 if (key != NULL) { 1097 /* 1098 * IEEE 802.1X: send EAPOL frames always in the clear. 1099 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1100 */ 1101 if ((m->m_flags & M_EAPOL) == 0 || 1102 ((vap->iv_flags & IEEE80211_F_WPA) && 1103 (vap->iv_opmode == IEEE80211_M_STA ? 1104 !IEEE80211_KEY_UNDEFINED(key) : 1105 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1106 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1107 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1108 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1109 eh.ether_dhost, 1110 "%s", "enmic failed, discard frame"); 1111 vap->iv_stats.is_crypto_enmicfail++; 1112 goto bad; 1113 } 1114 } 1115 } 1116 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1117 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1118 goto bad; 1119 1120 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1121 1122 IEEE80211_NODE_STAT(ni, tx_data); 1123 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1124 IEEE80211_NODE_STAT(ni, tx_mcast); 1125 else 1126 IEEE80211_NODE_STAT(ni, tx_ucast); 1127 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1128 1129 /* XXX fragmented frames not handled */ 1130 if (bpf_peers_present(vap->iv_rawbpf)) 1131 bpf_mtap(vap->iv_rawbpf, m); 1132 1133 return m; 1134bad: 1135 if (m != NULL) 1136 m_freem(m); 1137 return NULL; 1138#undef WH4 1139} 1140 1141/* 1142 * Fragment the frame according to the specified mtu. 1143 * The size of the 802.11 header (w/o padding) is provided 1144 * so we don't need to recalculate it. We create a new 1145 * mbuf for each fragment and chain it through m_nextpkt; 1146 * we might be able to optimize this by reusing the original 1147 * packet's mbufs but that is significantly more complicated. 1148 */ 1149static int 1150ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1151 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1152{ 1153 struct ieee80211_frame *wh, *whf; 1154 struct mbuf *m, *prev, *next; 1155 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1156 1157 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1158 KASSERT(m0->m_pkthdr.len > mtu, 1159 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1160 1161 wh = mtod(m0, struct ieee80211_frame *); 1162 /* NB: mark the first frag; it will be propagated below */ 1163 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1164 totalhdrsize = hdrsize + ciphdrsize; 1165 fragno = 1; 1166 off = mtu - ciphdrsize; 1167 remainder = m0->m_pkthdr.len - off; 1168 prev = m0; 1169 do { 1170 fragsize = totalhdrsize + remainder; 1171 if (fragsize > mtu) 1172 fragsize = mtu; 1173 /* XXX fragsize can be >2048! */ 1174 KASSERT(fragsize < MCLBYTES, 1175 ("fragment size %u too big!", fragsize)); 1176 if (fragsize > MHLEN) 1177 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1178 else 1179 m = m_gethdr(M_DONTWAIT, MT_DATA); 1180 if (m == NULL) 1181 goto bad; 1182 /* leave room to prepend any cipher header */ 1183 m_align(m, fragsize - ciphdrsize); 1184 1185 /* 1186 * Form the header in the fragment. Note that since 1187 * we mark the first fragment with the MORE_FRAG bit 1188 * it automatically is propagated to each fragment; we 1189 * need only clear it on the last fragment (done below). 1190 */ 1191 whf = mtod(m, struct ieee80211_frame *); 1192 memcpy(whf, wh, hdrsize); 1193 *(uint16_t *)&whf->i_seq[0] |= htole16( 1194 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1195 IEEE80211_SEQ_FRAG_SHIFT); 1196 fragno++; 1197 1198 payload = fragsize - totalhdrsize; 1199 /* NB: destination is known to be contiguous */ 1200 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1201 m->m_len = hdrsize + payload; 1202 m->m_pkthdr.len = hdrsize + payload; 1203 m->m_flags |= M_FRAG; 1204 1205 /* chain up the fragment */ 1206 prev->m_nextpkt = m; 1207 prev = m; 1208 1209 /* deduct fragment just formed */ 1210 remainder -= payload; 1211 off += payload; 1212 } while (remainder != 0); 1213 1214 /* set the last fragment */ 1215 m->m_flags |= M_LASTFRAG; 1216 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1217 1218 /* strip first mbuf now that everything has been copied */ 1219 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1220 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1221 1222 vap->iv_stats.is_tx_fragframes++; 1223 vap->iv_stats.is_tx_frags += fragno-1; 1224 1225 return 1; 1226bad: 1227 /* reclaim fragments but leave original frame for caller to free */ 1228 for (m = m0->m_nextpkt; m != NULL; m = next) { 1229 next = m->m_nextpkt; 1230 m->m_nextpkt = NULL; /* XXX paranoid */ 1231 m_freem(m); 1232 } 1233 m0->m_nextpkt = NULL; 1234 return 0; 1235} 1236 1237/* 1238 * Add a supported rates element id to a frame. 1239 */ 1240static uint8_t * 1241ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1242{ 1243 int nrates; 1244 1245 *frm++ = IEEE80211_ELEMID_RATES; 1246 nrates = rs->rs_nrates; 1247 if (nrates > IEEE80211_RATE_SIZE) 1248 nrates = IEEE80211_RATE_SIZE; 1249 *frm++ = nrates; 1250 memcpy(frm, rs->rs_rates, nrates); 1251 return frm + nrates; 1252} 1253 1254/* 1255 * Add an extended supported rates element id to a frame. 1256 */ 1257static uint8_t * 1258ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1259{ 1260 /* 1261 * Add an extended supported rates element if operating in 11g mode. 1262 */ 1263 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1264 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1265 *frm++ = IEEE80211_ELEMID_XRATES; 1266 *frm++ = nrates; 1267 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1268 frm += nrates; 1269 } 1270 return frm; 1271} 1272 1273/* 1274 * Add an ssid element to a frame. 1275 */ 1276static uint8_t * 1277ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1278{ 1279 *frm++ = IEEE80211_ELEMID_SSID; 1280 *frm++ = len; 1281 memcpy(frm, ssid, len); 1282 return frm + len; 1283} 1284 1285/* 1286 * Add an erp element to a frame. 1287 */ 1288static uint8_t * 1289ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1290{ 1291 uint8_t erp; 1292 1293 *frm++ = IEEE80211_ELEMID_ERP; 1294 *frm++ = 1; 1295 erp = 0; 1296 if (ic->ic_nonerpsta != 0) 1297 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1298 if (ic->ic_flags & IEEE80211_F_USEPROT) 1299 erp |= IEEE80211_ERP_USE_PROTECTION; 1300 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1301 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1302 *frm++ = erp; 1303 return frm; 1304} 1305 1306/* 1307 * Add a CFParams element to a frame. 1308 */ 1309static uint8_t * 1310ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1311{ 1312#define ADDSHORT(frm, v) do { \ 1313 frm[0] = (v) & 0xff; \ 1314 frm[1] = (v) >> 8; \ 1315 frm += 2; \ 1316} while (0) 1317 *frm++ = IEEE80211_ELEMID_CFPARMS; 1318 *frm++ = 6; 1319 *frm++ = 0; /* CFP count */ 1320 *frm++ = 2; /* CFP period */ 1321 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1322 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1323 return frm; 1324#undef ADDSHORT 1325} 1326 1327static __inline uint8_t * 1328add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1329{ 1330 memcpy(frm, ie->ie_data, ie->ie_len); 1331 return frm + ie->ie_len; 1332} 1333 1334static __inline uint8_t * 1335add_ie(uint8_t *frm, const uint8_t *ie) 1336{ 1337 memcpy(frm, ie, 2 + ie[1]); 1338 return frm + 2 + ie[1]; 1339} 1340 1341#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1342/* 1343 * Add a WME information element to a frame. 1344 */ 1345static uint8_t * 1346ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1347{ 1348 static const struct ieee80211_wme_info info = { 1349 .wme_id = IEEE80211_ELEMID_VENDOR, 1350 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1351 .wme_oui = { WME_OUI_BYTES }, 1352 .wme_type = WME_OUI_TYPE, 1353 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1354 .wme_version = WME_VERSION, 1355 .wme_info = 0, 1356 }; 1357 memcpy(frm, &info, sizeof(info)); 1358 return frm + sizeof(info); 1359} 1360 1361/* 1362 * Add a WME parameters element to a frame. 1363 */ 1364static uint8_t * 1365ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1366{ 1367#define SM(_v, _f) (((_v) << _f##_S) & _f) 1368#define ADDSHORT(frm, v) do { \ 1369 frm[0] = (v) & 0xff; \ 1370 frm[1] = (v) >> 8; \ 1371 frm += 2; \ 1372} while (0) 1373 /* NB: this works 'cuz a param has an info at the front */ 1374 static const struct ieee80211_wme_info param = { 1375 .wme_id = IEEE80211_ELEMID_VENDOR, 1376 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1377 .wme_oui = { WME_OUI_BYTES }, 1378 .wme_type = WME_OUI_TYPE, 1379 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1380 .wme_version = WME_VERSION, 1381 }; 1382 int i; 1383 1384 memcpy(frm, ¶m, sizeof(param)); 1385 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1386 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1387 *frm++ = 0; /* reserved field */ 1388 for (i = 0; i < WME_NUM_AC; i++) { 1389 const struct wmeParams *ac = 1390 &wme->wme_bssChanParams.cap_wmeParams[i]; 1391 *frm++ = SM(i, WME_PARAM_ACI) 1392 | SM(ac->wmep_acm, WME_PARAM_ACM) 1393 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1394 ; 1395 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1396 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1397 ; 1398 ADDSHORT(frm, ac->wmep_txopLimit); 1399 } 1400 return frm; 1401#undef SM 1402#undef ADDSHORT 1403} 1404#undef WME_OUI_BYTES 1405 1406/* 1407 * Add an 11h Power Constraint element to a frame. 1408 */ 1409static uint8_t * 1410ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1411{ 1412 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1413 /* XXX per-vap tx power limit? */ 1414 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1415 1416 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1417 frm[1] = 1; 1418 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1419 return frm + 3; 1420} 1421 1422/* 1423 * Add an 11h Power Capability element to a frame. 1424 */ 1425static uint8_t * 1426ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1427{ 1428 frm[0] = IEEE80211_ELEMID_PWRCAP; 1429 frm[1] = 2; 1430 frm[2] = c->ic_minpower; 1431 frm[3] = c->ic_maxpower; 1432 return frm + 4; 1433} 1434 1435/* 1436 * Add an 11h Supported Channels element to a frame. 1437 */ 1438static uint8_t * 1439ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1440{ 1441 static const int ielen = 26; 1442 1443 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1444 frm[1] = ielen; 1445 /* XXX not correct */ 1446 memcpy(frm+2, ic->ic_chan_avail, ielen); 1447 return frm + 2 + ielen; 1448} 1449 1450/* 1451 * Add an 11h Channel Switch Announcement element to a frame. 1452 * Note that we use the per-vap CSA count to adjust the global 1453 * counter so we can use this routine to form probe response 1454 * frames and get the current count. 1455 */ 1456static uint8_t * 1457ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1458{ 1459 struct ieee80211com *ic = vap->iv_ic; 1460 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1461 1462 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1463 csa->csa_len = 3; 1464 csa->csa_mode = 1; /* XXX force quiet on channel */ 1465 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1466 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1467 return frm + sizeof(*csa); 1468} 1469 1470/* 1471 * Add an 11h country information element to a frame. 1472 */ 1473static uint8_t * 1474ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1475{ 1476 1477 if (ic->ic_countryie == NULL || 1478 ic->ic_countryie_chan != ic->ic_bsschan) { 1479 /* 1480 * Handle lazy construction of ie. This is done on 1481 * first use and after a channel change that requires 1482 * re-calculation. 1483 */ 1484 if (ic->ic_countryie != NULL) 1485 free(ic->ic_countryie, M_80211_NODE_IE); 1486 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1487 if (ic->ic_countryie == NULL) 1488 return frm; 1489 ic->ic_countryie_chan = ic->ic_bsschan; 1490 } 1491 return add_appie(frm, ic->ic_countryie); 1492} 1493 1494/* 1495 * Send a probe request frame with the specified ssid 1496 * and any optional information element data. 1497 */ 1498int 1499ieee80211_send_probereq(struct ieee80211_node *ni, 1500 const uint8_t sa[IEEE80211_ADDR_LEN], 1501 const uint8_t da[IEEE80211_ADDR_LEN], 1502 const uint8_t bssid[IEEE80211_ADDR_LEN], 1503 const uint8_t *ssid, size_t ssidlen) 1504{ 1505 struct ieee80211vap *vap = ni->ni_vap; 1506 struct ieee80211com *ic = ni->ni_ic; 1507 const struct ieee80211_txparam *tp; 1508 struct ieee80211_bpf_params params; 1509 struct ieee80211_frame *wh; 1510 const struct ieee80211_rateset *rs; 1511 struct mbuf *m; 1512 uint8_t *frm; 1513 1514 if (vap->iv_state == IEEE80211_S_CAC) { 1515 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1516 "block %s frame in CAC state", "probe request"); 1517 vap->iv_stats.is_tx_badstate++; 1518 return EIO; /* XXX */ 1519 } 1520 1521 /* 1522 * Hold a reference on the node so it doesn't go away until after 1523 * the xmit is complete all the way in the driver. On error we 1524 * will remove our reference. 1525 */ 1526 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1527 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1528 __func__, __LINE__, 1529 ni, ether_sprintf(ni->ni_macaddr), 1530 ieee80211_node_refcnt(ni)+1); 1531 ieee80211_ref_node(ni); 1532 1533 /* 1534 * prreq frame format 1535 * [tlv] ssid 1536 * [tlv] supported rates 1537 * [tlv] RSN (optional) 1538 * [tlv] extended supported rates 1539 * [tlv] WPA (optional) 1540 * [tlv] user-specified ie's 1541 */ 1542 m = ieee80211_getmgtframe(&frm, 1543 ic->ic_headroom + sizeof(struct ieee80211_frame), 1544 2 + IEEE80211_NWID_LEN 1545 + 2 + IEEE80211_RATE_SIZE 1546 + sizeof(struct ieee80211_ie_wpa) 1547 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1548 + sizeof(struct ieee80211_ie_wpa) 1549 + (vap->iv_appie_probereq != NULL ? 1550 vap->iv_appie_probereq->ie_len : 0) 1551 ); 1552 if (m == NULL) { 1553 vap->iv_stats.is_tx_nobuf++; 1554 ieee80211_free_node(ni); 1555 return ENOMEM; 1556 } 1557 1558 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1559 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1560 frm = ieee80211_add_rates(frm, rs); 1561 if (vap->iv_flags & IEEE80211_F_WPA2) { 1562 if (vap->iv_rsn_ie != NULL) 1563 frm = add_ie(frm, vap->iv_rsn_ie); 1564 /* XXX else complain? */ 1565 } 1566 frm = ieee80211_add_xrates(frm, rs); 1567 if (vap->iv_flags & IEEE80211_F_WPA1) { 1568 if (vap->iv_wpa_ie != NULL) 1569 frm = add_ie(frm, vap->iv_wpa_ie); 1570 /* XXX else complain? */ 1571 } 1572 if (vap->iv_appie_probereq != NULL) 1573 frm = add_appie(frm, vap->iv_appie_probereq); 1574 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1575 1576 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1577 ("leading space %zd", M_LEADINGSPACE(m))); 1578 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1579 if (m == NULL) { 1580 /* NB: cannot happen */ 1581 ieee80211_free_node(ni); 1582 return ENOMEM; 1583 } 1584 1585 wh = mtod(m, struct ieee80211_frame *); 1586 ieee80211_send_setup(ni, wh, 1587 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1588 IEEE80211_NONQOS_TID, sa, da, bssid); 1589 /* XXX power management? */ 1590 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1591 1592 M_WME_SETAC(m, WME_AC_BE); 1593 1594 IEEE80211_NODE_STAT(ni, tx_probereq); 1595 IEEE80211_NODE_STAT(ni, tx_mgmt); 1596 1597 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1598 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1599 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1600 ssidlen, ssid); 1601 1602 memset(¶ms, 0, sizeof(params)); 1603 params.ibp_pri = M_WME_GETAC(m); 1604 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1605 params.ibp_rate0 = tp->mgmtrate; 1606 if (IEEE80211_IS_MULTICAST(da)) { 1607 params.ibp_flags |= IEEE80211_BPF_NOACK; 1608 params.ibp_try0 = 1; 1609 } else 1610 params.ibp_try0 = tp->maxretry; 1611 params.ibp_power = ni->ni_txpower; 1612 return ic->ic_raw_xmit(ni, m, ¶ms); 1613} 1614 1615/* 1616 * Calculate capability information for mgt frames. 1617 */ 1618static uint16_t 1619getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1620{ 1621 struct ieee80211com *ic = vap->iv_ic; 1622 uint16_t capinfo; 1623 1624 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1625 1626 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1627 capinfo = IEEE80211_CAPINFO_ESS; 1628 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1629 capinfo = IEEE80211_CAPINFO_IBSS; 1630 else 1631 capinfo = 0; 1632 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1633 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1634 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1635 IEEE80211_IS_CHAN_2GHZ(chan)) 1636 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1637 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1638 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1639 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1640 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1641 return capinfo; 1642} 1643 1644/* 1645 * Send a management frame. The node is for the destination (or ic_bss 1646 * when in station mode). Nodes other than ic_bss have their reference 1647 * count bumped to reflect our use for an indeterminant time. 1648 */ 1649int 1650ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1651{ 1652#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1653#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1654 struct ieee80211vap *vap = ni->ni_vap; 1655 struct ieee80211com *ic = ni->ni_ic; 1656 struct ieee80211_node *bss = vap->iv_bss; 1657 struct ieee80211_bpf_params params; 1658 struct mbuf *m; 1659 uint8_t *frm; 1660 uint16_t capinfo; 1661 int has_challenge, is_shared_key, ret, status; 1662 1663 KASSERT(ni != NULL, ("null node")); 1664 1665 /* 1666 * Hold a reference on the node so it doesn't go away until after 1667 * the xmit is complete all the way in the driver. On error we 1668 * will remove our reference. 1669 */ 1670 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1671 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1672 __func__, __LINE__, 1673 ni, ether_sprintf(ni->ni_macaddr), 1674 ieee80211_node_refcnt(ni)+1); 1675 ieee80211_ref_node(ni); 1676 1677 memset(¶ms, 0, sizeof(params)); 1678 switch (type) { 1679 1680 case IEEE80211_FC0_SUBTYPE_AUTH: 1681 status = arg >> 16; 1682 arg &= 0xffff; 1683 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1684 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1685 ni->ni_challenge != NULL); 1686 1687 /* 1688 * Deduce whether we're doing open authentication or 1689 * shared key authentication. We do the latter if 1690 * we're in the middle of a shared key authentication 1691 * handshake or if we're initiating an authentication 1692 * request and configured to use shared key. 1693 */ 1694 is_shared_key = has_challenge || 1695 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1696 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1697 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1698 1699 m = ieee80211_getmgtframe(&frm, 1700 ic->ic_headroom + sizeof(struct ieee80211_frame), 1701 3 * sizeof(uint16_t) 1702 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1703 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1704 ); 1705 if (m == NULL) 1706 senderr(ENOMEM, is_tx_nobuf); 1707 1708 ((uint16_t *)frm)[0] = 1709 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1710 : htole16(IEEE80211_AUTH_ALG_OPEN); 1711 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1712 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1713 1714 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1715 ((uint16_t *)frm)[3] = 1716 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1717 IEEE80211_ELEMID_CHALLENGE); 1718 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1719 IEEE80211_CHALLENGE_LEN); 1720 m->m_pkthdr.len = m->m_len = 1721 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1722 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1723 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1724 "request encrypt frame (%s)", __func__); 1725 /* mark frame for encryption */ 1726 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1727 } 1728 } else 1729 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1730 1731 /* XXX not right for shared key */ 1732 if (status == IEEE80211_STATUS_SUCCESS) 1733 IEEE80211_NODE_STAT(ni, tx_auth); 1734 else 1735 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1736 1737 if (vap->iv_opmode == IEEE80211_M_STA) 1738 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1739 (void *) vap->iv_state); 1740 break; 1741 1742 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1743 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1744 "send station deauthenticate (reason %d)", arg); 1745 m = ieee80211_getmgtframe(&frm, 1746 ic->ic_headroom + sizeof(struct ieee80211_frame), 1747 sizeof(uint16_t)); 1748 if (m == NULL) 1749 senderr(ENOMEM, is_tx_nobuf); 1750 *(uint16_t *)frm = htole16(arg); /* reason */ 1751 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1752 1753 IEEE80211_NODE_STAT(ni, tx_deauth); 1754 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1755 1756 ieee80211_node_unauthorize(ni); /* port closed */ 1757 break; 1758 1759 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1760 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1761 /* 1762 * asreq frame format 1763 * [2] capability information 1764 * [2] listen interval 1765 * [6*] current AP address (reassoc only) 1766 * [tlv] ssid 1767 * [tlv] supported rates 1768 * [tlv] extended supported rates 1769 * [4] power capability (optional) 1770 * [28] supported channels (optional) 1771 * [tlv] HT capabilities 1772 * [tlv] WME (optional) 1773 * [tlv] Vendor OUI HT capabilities (optional) 1774 * [tlv] Atheros capabilities (if negotiated) 1775 * [tlv] AppIE's (optional) 1776 */ 1777 m = ieee80211_getmgtframe(&frm, 1778 ic->ic_headroom + sizeof(struct ieee80211_frame), 1779 sizeof(uint16_t) 1780 + sizeof(uint16_t) 1781 + IEEE80211_ADDR_LEN 1782 + 2 + IEEE80211_NWID_LEN 1783 + 2 + IEEE80211_RATE_SIZE 1784 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1785 + 4 1786 + 2 + 26 1787 + sizeof(struct ieee80211_wme_info) 1788 + sizeof(struct ieee80211_ie_htcap) 1789 + 4 + sizeof(struct ieee80211_ie_htcap) 1790#ifdef IEEE80211_SUPPORT_SUPERG 1791 + sizeof(struct ieee80211_ath_ie) 1792#endif 1793 + (vap->iv_appie_wpa != NULL ? 1794 vap->iv_appie_wpa->ie_len : 0) 1795 + (vap->iv_appie_assocreq != NULL ? 1796 vap->iv_appie_assocreq->ie_len : 0) 1797 ); 1798 if (m == NULL) 1799 senderr(ENOMEM, is_tx_nobuf); 1800 1801 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1802 ("wrong mode %u", vap->iv_opmode)); 1803 capinfo = IEEE80211_CAPINFO_ESS; 1804 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1805 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1806 /* 1807 * NB: Some 11a AP's reject the request when 1808 * short premable is set. 1809 */ 1810 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1811 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1812 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1813 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1814 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1815 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1816 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1817 (vap->iv_flags & IEEE80211_F_DOTH)) 1818 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1819 *(uint16_t *)frm = htole16(capinfo); 1820 frm += 2; 1821 1822 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1823 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1824 bss->ni_intval)); 1825 frm += 2; 1826 1827 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1828 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1829 frm += IEEE80211_ADDR_LEN; 1830 } 1831 1832 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1833 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1834 if (vap->iv_flags & IEEE80211_F_WPA2) { 1835 if (vap->iv_rsn_ie != NULL) 1836 frm = add_ie(frm, vap->iv_rsn_ie); 1837 /* XXX else complain? */ 1838 } 1839 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1840 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1841 frm = ieee80211_add_powercapability(frm, 1842 ic->ic_curchan); 1843 frm = ieee80211_add_supportedchannels(frm, ic); 1844 } 1845 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1846 ni->ni_ies.htcap_ie != NULL && 1847 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1848 frm = ieee80211_add_htcap(frm, ni); 1849 if (vap->iv_flags & IEEE80211_F_WPA1) { 1850 if (vap->iv_wpa_ie != NULL) 1851 frm = add_ie(frm, vap->iv_wpa_ie); 1852 /* XXX else complain */ 1853 } 1854 if ((ic->ic_flags & IEEE80211_F_WME) && 1855 ni->ni_ies.wme_ie != NULL) 1856 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1857 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1858 ni->ni_ies.htcap_ie != NULL && 1859 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1860 frm = ieee80211_add_htcap_vendor(frm, ni); 1861#ifdef IEEE80211_SUPPORT_SUPERG 1862 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1863 frm = ieee80211_add_ath(frm, 1864 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1865 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1866 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1867 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1868 } 1869#endif /* IEEE80211_SUPPORT_SUPERG */ 1870 if (vap->iv_appie_assocreq != NULL) 1871 frm = add_appie(frm, vap->iv_appie_assocreq); 1872 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1873 1874 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1875 (void *) vap->iv_state); 1876 break; 1877 1878 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1879 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1880 /* 1881 * asresp frame format 1882 * [2] capability information 1883 * [2] status 1884 * [2] association ID 1885 * [tlv] supported rates 1886 * [tlv] extended supported rates 1887 * [tlv] HT capabilities (standard, if STA enabled) 1888 * [tlv] HT information (standard, if STA enabled) 1889 * [tlv] WME (if configured and STA enabled) 1890 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1891 * [tlv] HT information (vendor OUI, if STA enabled) 1892 * [tlv] Atheros capabilities (if STA enabled) 1893 * [tlv] AppIE's (optional) 1894 */ 1895 m = ieee80211_getmgtframe(&frm, 1896 ic->ic_headroom + sizeof(struct ieee80211_frame), 1897 sizeof(uint16_t) 1898 + sizeof(uint16_t) 1899 + sizeof(uint16_t) 1900 + 2 + IEEE80211_RATE_SIZE 1901 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1902 + sizeof(struct ieee80211_ie_htcap) + 4 1903 + sizeof(struct ieee80211_ie_htinfo) + 4 1904 + sizeof(struct ieee80211_wme_param) 1905#ifdef IEEE80211_SUPPORT_SUPERG 1906 + sizeof(struct ieee80211_ath_ie) 1907#endif 1908 + (vap->iv_appie_assocresp != NULL ? 1909 vap->iv_appie_assocresp->ie_len : 0) 1910 ); 1911 if (m == NULL) 1912 senderr(ENOMEM, is_tx_nobuf); 1913 1914 capinfo = getcapinfo(vap, bss->ni_chan); 1915 *(uint16_t *)frm = htole16(capinfo); 1916 frm += 2; 1917 1918 *(uint16_t *)frm = htole16(arg); /* status */ 1919 frm += 2; 1920 1921 if (arg == IEEE80211_STATUS_SUCCESS) { 1922 *(uint16_t *)frm = htole16(ni->ni_associd); 1923 IEEE80211_NODE_STAT(ni, tx_assoc); 1924 } else 1925 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1926 frm += 2; 1927 1928 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1929 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1930 /* NB: respond according to what we received */ 1931 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1932 frm = ieee80211_add_htcap(frm, ni); 1933 frm = ieee80211_add_htinfo(frm, ni); 1934 } 1935 if ((vap->iv_flags & IEEE80211_F_WME) && 1936 ni->ni_ies.wme_ie != NULL) 1937 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1938 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1939 frm = ieee80211_add_htcap_vendor(frm, ni); 1940 frm = ieee80211_add_htinfo_vendor(frm, ni); 1941 } 1942#ifdef IEEE80211_SUPPORT_SUPERG 1943 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1944 frm = ieee80211_add_ath(frm, 1945 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1946 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1947 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1948 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1949#endif /* IEEE80211_SUPPORT_SUPERG */ 1950 if (vap->iv_appie_assocresp != NULL) 1951 frm = add_appie(frm, vap->iv_appie_assocresp); 1952 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1953 break; 1954 1955 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1956 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1957 "send station disassociate (reason %d)", arg); 1958 m = ieee80211_getmgtframe(&frm, 1959 ic->ic_headroom + sizeof(struct ieee80211_frame), 1960 sizeof(uint16_t)); 1961 if (m == NULL) 1962 senderr(ENOMEM, is_tx_nobuf); 1963 *(uint16_t *)frm = htole16(arg); /* reason */ 1964 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1965 1966 IEEE80211_NODE_STAT(ni, tx_disassoc); 1967 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1968 break; 1969 1970 default: 1971 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1972 "invalid mgmt frame type %u", type); 1973 senderr(EINVAL, is_tx_unknownmgt); 1974 /* NOTREACHED */ 1975 } 1976 1977 /* NB: force non-ProbeResp frames to the highest queue */ 1978 params.ibp_pri = WME_AC_VO; 1979 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1980 /* NB: we know all frames are unicast */ 1981 params.ibp_try0 = bss->ni_txparms->maxretry; 1982 params.ibp_power = bss->ni_txpower; 1983 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1984bad: 1985 ieee80211_free_node(ni); 1986 return ret; 1987#undef senderr 1988#undef HTFLAGS 1989} 1990 1991/* 1992 * Return an mbuf with a probe response frame in it. 1993 * Space is left to prepend and 802.11 header at the 1994 * front but it's left to the caller to fill in. 1995 */ 1996struct mbuf * 1997ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 1998{ 1999 struct ieee80211vap *vap = bss->ni_vap; 2000 struct ieee80211com *ic = bss->ni_ic; 2001 const struct ieee80211_rateset *rs; 2002 struct mbuf *m; 2003 uint16_t capinfo; 2004 uint8_t *frm; 2005 2006 /* 2007 * probe response frame format 2008 * [8] time stamp 2009 * [2] beacon interval 2010 * [2] cabability information 2011 * [tlv] ssid 2012 * [tlv] supported rates 2013 * [tlv] parameter set (FH/DS) 2014 * [tlv] parameter set (IBSS) 2015 * [tlv] country (optional) 2016 * [3] power control (optional) 2017 * [5] channel switch announcement (CSA) (optional) 2018 * [tlv] extended rate phy (ERP) 2019 * [tlv] extended supported rates 2020 * [tlv] RSN (optional) 2021 * [tlv] HT capabilities 2022 * [tlv] HT information 2023 * [tlv] WPA (optional) 2024 * [tlv] WME (optional) 2025 * [tlv] Vendor OUI HT capabilities (optional) 2026 * [tlv] Vendor OUI HT information (optional) 2027 * [tlv] Atheros capabilities 2028 * [tlv] AppIE's (optional) 2029 */ 2030 m = ieee80211_getmgtframe(&frm, 2031 ic->ic_headroom + sizeof(struct ieee80211_frame), 2032 8 2033 + sizeof(uint16_t) 2034 + sizeof(uint16_t) 2035 + 2 + IEEE80211_NWID_LEN 2036 + 2 + IEEE80211_RATE_SIZE 2037 + 7 /* max(7,3) */ 2038 + IEEE80211_COUNTRY_MAX_SIZE 2039 + 3 2040 + sizeof(struct ieee80211_csa_ie) 2041 + 3 2042 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2043 + sizeof(struct ieee80211_ie_wpa) 2044 + sizeof(struct ieee80211_ie_htcap) 2045 + sizeof(struct ieee80211_ie_htinfo) 2046 + sizeof(struct ieee80211_ie_wpa) 2047 + sizeof(struct ieee80211_wme_param) 2048 + 4 + sizeof(struct ieee80211_ie_htcap) 2049 + 4 + sizeof(struct ieee80211_ie_htinfo) 2050#ifdef IEEE80211_SUPPORT_SUPERG 2051 + sizeof(struct ieee80211_ath_ie) 2052#endif 2053 + (vap->iv_appie_proberesp != NULL ? 2054 vap->iv_appie_proberesp->ie_len : 0) 2055 ); 2056 if (m == NULL) { 2057 vap->iv_stats.is_tx_nobuf++; 2058 return NULL; 2059 } 2060 2061 memset(frm, 0, 8); /* timestamp should be filled later */ 2062 frm += 8; 2063 *(uint16_t *)frm = htole16(bss->ni_intval); 2064 frm += 2; 2065 capinfo = getcapinfo(vap, bss->ni_chan); 2066 *(uint16_t *)frm = htole16(capinfo); 2067 frm += 2; 2068 2069 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2070 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2071 frm = ieee80211_add_rates(frm, rs); 2072 2073 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2074 *frm++ = IEEE80211_ELEMID_FHPARMS; 2075 *frm++ = 5; 2076 *frm++ = bss->ni_fhdwell & 0x00ff; 2077 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2078 *frm++ = IEEE80211_FH_CHANSET( 2079 ieee80211_chan2ieee(ic, bss->ni_chan)); 2080 *frm++ = IEEE80211_FH_CHANPAT( 2081 ieee80211_chan2ieee(ic, bss->ni_chan)); 2082 *frm++ = bss->ni_fhindex; 2083 } else { 2084 *frm++ = IEEE80211_ELEMID_DSPARMS; 2085 *frm++ = 1; 2086 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2087 } 2088 2089 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2090 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2091 *frm++ = 2; 2092 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2093 } 2094 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2095 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2096 frm = ieee80211_add_countryie(frm, ic); 2097 if (vap->iv_flags & IEEE80211_F_DOTH) { 2098 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2099 frm = ieee80211_add_powerconstraint(frm, vap); 2100 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2101 frm = ieee80211_add_csa(frm, vap); 2102 } 2103 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2104 frm = ieee80211_add_erp(frm, ic); 2105 frm = ieee80211_add_xrates(frm, rs); 2106 if (vap->iv_flags & IEEE80211_F_WPA2) { 2107 if (vap->iv_rsn_ie != NULL) 2108 frm = add_ie(frm, vap->iv_rsn_ie); 2109 /* XXX else complain? */ 2110 } 2111 /* 2112 * NB: legacy 11b clients do not get certain ie's. 2113 * The caller identifies such clients by passing 2114 * a token in legacy to us. Could expand this to be 2115 * any legacy client for stuff like HT ie's. 2116 */ 2117 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2118 legacy != IEEE80211_SEND_LEGACY_11B) { 2119 frm = ieee80211_add_htcap(frm, bss); 2120 frm = ieee80211_add_htinfo(frm, bss); 2121 } 2122 if (vap->iv_flags & IEEE80211_F_WPA1) { 2123 if (vap->iv_wpa_ie != NULL) 2124 frm = add_ie(frm, vap->iv_wpa_ie); 2125 /* XXX else complain? */ 2126 } 2127 if (vap->iv_flags & IEEE80211_F_WME) 2128 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2129 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2130 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2131 legacy != IEEE80211_SEND_LEGACY_11B) { 2132 frm = ieee80211_add_htcap_vendor(frm, bss); 2133 frm = ieee80211_add_htinfo_vendor(frm, bss); 2134 } 2135#ifdef IEEE80211_SUPPORT_SUPERG 2136 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2137 legacy != IEEE80211_SEND_LEGACY_11B) 2138 frm = ieee80211_add_athcaps(frm, bss); 2139#endif 2140 if (vap->iv_appie_proberesp != NULL) 2141 frm = add_appie(frm, vap->iv_appie_proberesp); 2142 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2143 2144 return m; 2145} 2146 2147/* 2148 * Send a probe response frame to the specified mac address. 2149 * This does not go through the normal mgt frame api so we 2150 * can specify the destination address and re-use the bss node 2151 * for the sta reference. 2152 */ 2153int 2154ieee80211_send_proberesp(struct ieee80211vap *vap, 2155 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2156{ 2157 struct ieee80211_node *bss = vap->iv_bss; 2158 struct ieee80211com *ic = vap->iv_ic; 2159 struct ieee80211_frame *wh; 2160 struct mbuf *m; 2161 2162 if (vap->iv_state == IEEE80211_S_CAC) { 2163 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2164 "block %s frame in CAC state", "probe response"); 2165 vap->iv_stats.is_tx_badstate++; 2166 return EIO; /* XXX */ 2167 } 2168 2169 /* 2170 * Hold a reference on the node so it doesn't go away until after 2171 * the xmit is complete all the way in the driver. On error we 2172 * will remove our reference. 2173 */ 2174 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2175 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2176 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2177 ieee80211_node_refcnt(bss)+1); 2178 ieee80211_ref_node(bss); 2179 2180 m = ieee80211_alloc_proberesp(bss, legacy); 2181 if (m == NULL) { 2182 ieee80211_free_node(bss); 2183 return ENOMEM; 2184 } 2185 2186 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2187 KASSERT(m != NULL, ("no room for header")); 2188 2189 wh = mtod(m, struct ieee80211_frame *); 2190 ieee80211_send_setup(bss, wh, 2191 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2192 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2193 /* XXX power management? */ 2194 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2195 2196 M_WME_SETAC(m, WME_AC_BE); 2197 2198 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2199 "send probe resp on channel %u to %s%s\n", 2200 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2201 legacy ? " <legacy>" : ""); 2202 IEEE80211_NODE_STAT(bss, tx_mgmt); 2203 2204 return ic->ic_raw_xmit(bss, m, NULL); 2205} 2206 2207/* 2208 * Allocate and build a RTS (Request To Send) control frame. 2209 */ 2210struct mbuf * 2211ieee80211_alloc_rts(struct ieee80211com *ic, 2212 const uint8_t ra[IEEE80211_ADDR_LEN], 2213 const uint8_t ta[IEEE80211_ADDR_LEN], 2214 uint16_t dur) 2215{ 2216 struct ieee80211_frame_rts *rts; 2217 struct mbuf *m; 2218 2219 /* XXX honor ic_headroom */ 2220 m = m_gethdr(M_DONTWAIT, MT_DATA); 2221 if (m != NULL) { 2222 rts = mtod(m, struct ieee80211_frame_rts *); 2223 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2224 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2225 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2226 *(u_int16_t *)rts->i_dur = htole16(dur); 2227 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2228 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2229 2230 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2231 } 2232 return m; 2233} 2234 2235/* 2236 * Allocate and build a CTS (Clear To Send) control frame. 2237 */ 2238struct mbuf * 2239ieee80211_alloc_cts(struct ieee80211com *ic, 2240 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2241{ 2242 struct ieee80211_frame_cts *cts; 2243 struct mbuf *m; 2244 2245 /* XXX honor ic_headroom */ 2246 m = m_gethdr(M_DONTWAIT, MT_DATA); 2247 if (m != NULL) { 2248 cts = mtod(m, struct ieee80211_frame_cts *); 2249 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2250 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2251 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2252 *(u_int16_t *)cts->i_dur = htole16(dur); 2253 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2254 2255 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2256 } 2257 return m; 2258} 2259 2260static void 2261ieee80211_tx_mgt_timeout(void *arg) 2262{ 2263 struct ieee80211_node *ni = arg; 2264 struct ieee80211vap *vap = ni->ni_vap; 2265 2266 if (vap->iv_state != IEEE80211_S_INIT && 2267 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2268 /* 2269 * NB: it's safe to specify a timeout as the reason here; 2270 * it'll only be used in the right state. 2271 */ 2272 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2273 IEEE80211_SCAN_FAIL_TIMEOUT); 2274 } 2275} 2276 2277static void 2278ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2279{ 2280 struct ieee80211vap *vap = ni->ni_vap; 2281 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2282 2283 /* 2284 * Frame transmit completed; arrange timer callback. If 2285 * transmit was successfuly we wait for response. Otherwise 2286 * we arrange an immediate callback instead of doing the 2287 * callback directly since we don't know what state the driver 2288 * is in (e.g. what locks it is holding). This work should 2289 * not be too time-critical and not happen too often so the 2290 * added overhead is acceptable. 2291 * 2292 * XXX what happens if !acked but response shows up before callback? 2293 */ 2294 if (vap->iv_state == ostate) 2295 callout_reset(&vap->iv_mgtsend, 2296 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2297 ieee80211_tx_mgt_timeout, ni); 2298} 2299 2300static void 2301ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2302 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2303{ 2304 struct ieee80211vap *vap = ni->ni_vap; 2305 struct ieee80211com *ic = ni->ni_ic; 2306 struct ieee80211_rateset *rs = &ni->ni_rates; 2307 uint16_t capinfo; 2308 2309 /* 2310 * beacon frame format 2311 * [8] time stamp 2312 * [2] beacon interval 2313 * [2] cabability information 2314 * [tlv] ssid 2315 * [tlv] supported rates 2316 * [3] parameter set (DS) 2317 * [8] CF parameter set (optional) 2318 * [tlv] parameter set (IBSS/TIM) 2319 * [tlv] country (optional) 2320 * [3] power control (optional) 2321 * [5] channel switch announcement (CSA) (optional) 2322 * [tlv] extended rate phy (ERP) 2323 * [tlv] extended supported rates 2324 * [tlv] RSN parameters 2325 * [tlv] HT capabilities 2326 * [tlv] HT information 2327 * XXX Vendor-specific OIDs (e.g. Atheros) 2328 * [tlv] WPA parameters 2329 * [tlv] WME parameters 2330 * [tlv] Vendor OUI HT capabilities (optional) 2331 * [tlv] Vendor OUI HT information (optional) 2332 * [tlv] Atheros capabilities (optional) 2333 * [tlv] TDMA parameters (optional) 2334 * [tlv] application data (optional) 2335 */ 2336 2337 memset(bo, 0, sizeof(*bo)); 2338 2339 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2340 frm += 8; 2341 *(uint16_t *)frm = htole16(ni->ni_intval); 2342 frm += 2; 2343 capinfo = getcapinfo(vap, ni->ni_chan); 2344 bo->bo_caps = (uint16_t *)frm; 2345 *(uint16_t *)frm = htole16(capinfo); 2346 frm += 2; 2347 *frm++ = IEEE80211_ELEMID_SSID; 2348 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2349 *frm++ = ni->ni_esslen; 2350 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2351 frm += ni->ni_esslen; 2352 } else 2353 *frm++ = 0; 2354 frm = ieee80211_add_rates(frm, rs); 2355 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2356 *frm++ = IEEE80211_ELEMID_DSPARMS; 2357 *frm++ = 1; 2358 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2359 } 2360 if (ic->ic_flags & IEEE80211_F_PCF) { 2361 bo->bo_cfp = frm; 2362 frm = ieee80211_add_cfparms(frm, ic); 2363 } 2364 bo->bo_tim = frm; 2365 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2366 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2367 *frm++ = 2; 2368 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2369 bo->bo_tim_len = 0; 2370 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2371 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2372 2373 tie->tim_ie = IEEE80211_ELEMID_TIM; 2374 tie->tim_len = 4; /* length */ 2375 tie->tim_count = 0; /* DTIM count */ 2376 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2377 tie->tim_bitctl = 0; /* bitmap control */ 2378 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2379 frm += sizeof(struct ieee80211_tim_ie); 2380 bo->bo_tim_len = 1; 2381 } 2382 bo->bo_tim_trailer = frm; 2383 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2384 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2385 frm = ieee80211_add_countryie(frm, ic); 2386 if (vap->iv_flags & IEEE80211_F_DOTH) { 2387 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2388 frm = ieee80211_add_powerconstraint(frm, vap); 2389 bo->bo_csa = frm; 2390 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2391 frm = ieee80211_add_csa(frm, vap); 2392 } else 2393 bo->bo_csa = frm; 2394 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2395 bo->bo_erp = frm; 2396 frm = ieee80211_add_erp(frm, ic); 2397 } 2398 frm = ieee80211_add_xrates(frm, rs); 2399 if (vap->iv_flags & IEEE80211_F_WPA2) { 2400 if (vap->iv_rsn_ie != NULL) 2401 frm = add_ie(frm, vap->iv_rsn_ie); 2402 /* XXX else complain */ 2403 } 2404 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2405 frm = ieee80211_add_htcap(frm, ni); 2406 bo->bo_htinfo = frm; 2407 frm = ieee80211_add_htinfo(frm, ni); 2408 } 2409 if (vap->iv_flags & IEEE80211_F_WPA1) { 2410 if (vap->iv_wpa_ie != NULL) 2411 frm = add_ie(frm, vap->iv_wpa_ie); 2412 /* XXX else complain */ 2413 } 2414 if (vap->iv_flags & IEEE80211_F_WME) { 2415 bo->bo_wme = frm; 2416 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2417 } 2418 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2419 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2420 frm = ieee80211_add_htcap_vendor(frm, ni); 2421 frm = ieee80211_add_htinfo_vendor(frm, ni); 2422 } 2423#ifdef IEEE80211_SUPPORT_SUPERG 2424 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2425 bo->bo_ath = frm; 2426 frm = ieee80211_add_athcaps(frm, ni); 2427 } 2428#endif 2429#ifdef IEEE80211_SUPPORT_TDMA 2430 if (vap->iv_caps & IEEE80211_C_TDMA) { 2431 bo->bo_tdma = frm; 2432 frm = ieee80211_add_tdma(frm, vap); 2433 } 2434#endif 2435 if (vap->iv_appie_beacon != NULL) { 2436 bo->bo_appie = frm; 2437 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2438 frm = add_appie(frm, vap->iv_appie_beacon); 2439 } 2440 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2441 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2442 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2443} 2444 2445/* 2446 * Allocate a beacon frame and fillin the appropriate bits. 2447 */ 2448struct mbuf * 2449ieee80211_beacon_alloc(struct ieee80211_node *ni, 2450 struct ieee80211_beacon_offsets *bo) 2451{ 2452 struct ieee80211vap *vap = ni->ni_vap; 2453 struct ieee80211com *ic = ni->ni_ic; 2454 struct ifnet *ifp = vap->iv_ifp; 2455 struct ieee80211_frame *wh; 2456 struct mbuf *m; 2457 int pktlen; 2458 uint8_t *frm; 2459 2460 /* 2461 * beacon frame format 2462 * [8] time stamp 2463 * [2] beacon interval 2464 * [2] cabability information 2465 * [tlv] ssid 2466 * [tlv] supported rates 2467 * [3] parameter set (DS) 2468 * [8] CF parameter set (optional) 2469 * [tlv] parameter set (IBSS/TIM) 2470 * [tlv] country (optional) 2471 * [3] power control (optional) 2472 * [5] channel switch announcement (CSA) (optional) 2473 * [tlv] extended rate phy (ERP) 2474 * [tlv] extended supported rates 2475 * [tlv] RSN parameters 2476 * [tlv] HT capabilities 2477 * [tlv] HT information 2478 * [tlv] Vendor OUI HT capabilities (optional) 2479 * [tlv] Vendor OUI HT information (optional) 2480 * XXX Vendor-specific OIDs (e.g. Atheros) 2481 * [tlv] WPA parameters 2482 * [tlv] WME parameters 2483 * [tlv] TDMA parameters (optional) 2484 * [tlv] application data (optional) 2485 * NB: we allocate the max space required for the TIM bitmap. 2486 * XXX how big is this? 2487 */ 2488 pktlen = 8 /* time stamp */ 2489 + sizeof(uint16_t) /* beacon interval */ 2490 + sizeof(uint16_t) /* capabilities */ 2491 + 2 + ni->ni_esslen /* ssid */ 2492 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2493 + 2 + 1 /* DS parameters */ 2494 + 2 + 6 /* CF parameters */ 2495 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2496 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2497 + 2 + 1 /* power control */ 2498 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2499 + 2 + 1 /* ERP */ 2500 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2501 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2502 2*sizeof(struct ieee80211_ie_wpa) : 0) 2503 /* XXX conditional? */ 2504 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2505 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2506 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2507 sizeof(struct ieee80211_wme_param) : 0) 2508#ifdef IEEE80211_SUPPORT_SUPERG 2509 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2510#endif 2511#ifdef IEEE80211_SUPPORT_TDMA 2512 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2513 sizeof(struct ieee80211_tdma_param) : 0) 2514#endif 2515 + IEEE80211_MAX_APPIE 2516 ; 2517 m = ieee80211_getmgtframe(&frm, 2518 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2519 if (m == NULL) { 2520 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2521 "%s: cannot get buf; size %u\n", __func__, pktlen); 2522 vap->iv_stats.is_tx_nobuf++; 2523 return NULL; 2524 } 2525 ieee80211_beacon_construct(m, frm, bo, ni); 2526 2527 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2528 KASSERT(m != NULL, ("no space for 802.11 header?")); 2529 wh = mtod(m, struct ieee80211_frame *); 2530 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2531 IEEE80211_FC0_SUBTYPE_BEACON; 2532 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2533 *(uint16_t *)wh->i_dur = 0; 2534 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2535 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2536 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2537 *(uint16_t *)wh->i_seq = 0; 2538 2539 return m; 2540} 2541 2542/* 2543 * Update the dynamic parts of a beacon frame based on the current state. 2544 */ 2545int 2546ieee80211_beacon_update(struct ieee80211_node *ni, 2547 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2548{ 2549 struct ieee80211vap *vap = ni->ni_vap; 2550 struct ieee80211com *ic = ni->ni_ic; 2551 int len_changed = 0; 2552 uint16_t capinfo; 2553 2554 IEEE80211_LOCK(ic); 2555 /* 2556 * Handle 11h channel change when we've reached the count. 2557 * We must recalculate the beacon frame contents to account 2558 * for the new channel. Note we do this only for the first 2559 * vap that reaches this point; subsequent vaps just update 2560 * their beacon state to reflect the recalculated channel. 2561 */ 2562 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2563 vap->iv_csa_count == ic->ic_csa_count) { 2564 vap->iv_csa_count = 0; 2565 /* 2566 * Effect channel change before reconstructing the beacon 2567 * frame contents as many places reference ni_chan. 2568 */ 2569 if (ic->ic_csa_newchan != NULL) 2570 ieee80211_csa_completeswitch(ic); 2571 /* 2572 * NB: ieee80211_beacon_construct clears all pending 2573 * updates in bo_flags so we don't need to explicitly 2574 * clear IEEE80211_BEACON_CSA. 2575 */ 2576 ieee80211_beacon_construct(m, 2577 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2578 2579 /* XXX do WME aggressive mode processing? */ 2580 IEEE80211_UNLOCK(ic); 2581 return 1; /* just assume length changed */ 2582 } 2583 2584 /* XXX faster to recalculate entirely or just changes? */ 2585 capinfo = getcapinfo(vap, ni->ni_chan); 2586 *bo->bo_caps = htole16(capinfo); 2587 2588 if (vap->iv_flags & IEEE80211_F_WME) { 2589 struct ieee80211_wme_state *wme = &ic->ic_wme; 2590 2591 /* 2592 * Check for agressive mode change. When there is 2593 * significant high priority traffic in the BSS 2594 * throttle back BE traffic by using conservative 2595 * parameters. Otherwise BE uses agressive params 2596 * to optimize performance of legacy/non-QoS traffic. 2597 */ 2598 if (wme->wme_flags & WME_F_AGGRMODE) { 2599 if (wme->wme_hipri_traffic > 2600 wme->wme_hipri_switch_thresh) { 2601 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2602 "%s: traffic %u, disable aggressive mode\n", 2603 __func__, wme->wme_hipri_traffic); 2604 wme->wme_flags &= ~WME_F_AGGRMODE; 2605 ieee80211_wme_updateparams_locked(vap); 2606 wme->wme_hipri_traffic = 2607 wme->wme_hipri_switch_hysteresis; 2608 } else 2609 wme->wme_hipri_traffic = 0; 2610 } else { 2611 if (wme->wme_hipri_traffic <= 2612 wme->wme_hipri_switch_thresh) { 2613 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2614 "%s: traffic %u, enable aggressive mode\n", 2615 __func__, wme->wme_hipri_traffic); 2616 wme->wme_flags |= WME_F_AGGRMODE; 2617 ieee80211_wme_updateparams_locked(vap); 2618 wme->wme_hipri_traffic = 0; 2619 } else 2620 wme->wme_hipri_traffic = 2621 wme->wme_hipri_switch_hysteresis; 2622 } 2623 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2624 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2625 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2626 } 2627 } 2628 2629 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2630 ieee80211_ht_update_beacon(vap, bo); 2631 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2632 } 2633#ifdef IEEE80211_SUPPORT_TDMA 2634 if (vap->iv_caps & IEEE80211_C_TDMA) { 2635 /* 2636 * NB: the beacon is potentially updated every TBTT. 2637 */ 2638 ieee80211_tdma_update_beacon(vap, bo); 2639 } 2640#endif 2641 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2642 struct ieee80211_tim_ie *tie = 2643 (struct ieee80211_tim_ie *) bo->bo_tim; 2644 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2645 u_int timlen, timoff, i; 2646 /* 2647 * ATIM/DTIM needs updating. If it fits in the 2648 * current space allocated then just copy in the 2649 * new bits. Otherwise we need to move any trailing 2650 * data to make room. Note that we know there is 2651 * contiguous space because ieee80211_beacon_allocate 2652 * insures there is space in the mbuf to write a 2653 * maximal-size virtual bitmap (based on iv_max_aid). 2654 */ 2655 /* 2656 * Calculate the bitmap size and offset, copy any 2657 * trailer out of the way, and then copy in the 2658 * new bitmap and update the information element. 2659 * Note that the tim bitmap must contain at least 2660 * one byte and any offset must be even. 2661 */ 2662 if (vap->iv_ps_pending != 0) { 2663 timoff = 128; /* impossibly large */ 2664 for (i = 0; i < vap->iv_tim_len; i++) 2665 if (vap->iv_tim_bitmap[i]) { 2666 timoff = i &~ 1; 2667 break; 2668 } 2669 KASSERT(timoff != 128, ("tim bitmap empty!")); 2670 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2671 if (vap->iv_tim_bitmap[i]) 2672 break; 2673 timlen = 1 + (i - timoff); 2674 } else { 2675 timoff = 0; 2676 timlen = 1; 2677 } 2678 if (timlen != bo->bo_tim_len) { 2679 /* copy up/down trailer */ 2680 int adjust = tie->tim_bitmap+timlen 2681 - bo->bo_tim_trailer; 2682 ovbcopy(bo->bo_tim_trailer, 2683 bo->bo_tim_trailer+adjust, 2684 bo->bo_tim_trailer_len); 2685 bo->bo_tim_trailer += adjust; 2686 bo->bo_erp += adjust; 2687 bo->bo_htinfo += adjust; 2688#ifdef IEEE80211_SUPERG_SUPPORT 2689 bo->bo_ath += adjust; 2690#endif 2691#ifdef IEEE80211_TDMA_SUPPORT 2692 bo->bo_tdma += adjust; 2693#endif 2694 bo->bo_appie += adjust; 2695 bo->bo_wme += adjust; 2696 bo->bo_csa += adjust; 2697 bo->bo_tim_len = timlen; 2698 2699 /* update information element */ 2700 tie->tim_len = 3 + timlen; 2701 tie->tim_bitctl = timoff; 2702 len_changed = 1; 2703 } 2704 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2705 bo->bo_tim_len); 2706 2707 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2708 2709 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2710 "%s: TIM updated, pending %u, off %u, len %u\n", 2711 __func__, vap->iv_ps_pending, timoff, timlen); 2712 } 2713 /* count down DTIM period */ 2714 if (tie->tim_count == 0) 2715 tie->tim_count = tie->tim_period - 1; 2716 else 2717 tie->tim_count--; 2718 /* update state for buffered multicast frames on DTIM */ 2719 if (mcast && tie->tim_count == 0) 2720 tie->tim_bitctl |= 1; 2721 else 2722 tie->tim_bitctl &= ~1; 2723 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2724 struct ieee80211_csa_ie *csa = 2725 (struct ieee80211_csa_ie *) bo->bo_csa; 2726 2727 /* 2728 * Insert or update CSA ie. If we're just starting 2729 * to count down to the channel switch then we need 2730 * to insert the CSA ie. Otherwise we just need to 2731 * drop the count. The actual change happens above 2732 * when the vap's count reaches the target count. 2733 */ 2734 if (vap->iv_csa_count == 0) { 2735 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2736 bo->bo_erp += sizeof(*csa); 2737 bo->bo_htinfo += sizeof(*csa); 2738 bo->bo_wme += sizeof(*csa); 2739#ifdef IEEE80211_SUPERG_SUPPORT 2740 bo->bo_ath += sizeof(*csa); 2741#endif 2742#ifdef IEEE80211_TDMA_SUPPORT 2743 bo->bo_tdma += sizeof(*csa); 2744#endif 2745 bo->bo_appie += sizeof(*csa); 2746 bo->bo_csa_trailer_len += sizeof(*csa); 2747 bo->bo_tim_trailer_len += sizeof(*csa); 2748 m->m_len += sizeof(*csa); 2749 m->m_pkthdr.len += sizeof(*csa); 2750 2751 ieee80211_add_csa(bo->bo_csa, vap); 2752 } else 2753 csa->csa_count--; 2754 vap->iv_csa_count++; 2755 /* NB: don't clear IEEE80211_BEACON_CSA */ 2756 } 2757 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2758 /* 2759 * ERP element needs updating. 2760 */ 2761 (void) ieee80211_add_erp(bo->bo_erp, ic); 2762 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2763 } 2764#ifdef IEEE80211_SUPPORT_SUPERG 2765 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2766 ieee80211_add_athcaps(bo->bo_ath, ni); 2767 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2768 } 2769#endif 2770 } 2771 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2772 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2773 int aielen; 2774 uint8_t *frm; 2775 2776 aielen = 0; 2777 if (aie != NULL) 2778 aielen += aie->ie_len; 2779 if (aielen != bo->bo_appie_len) { 2780 /* copy up/down trailer */ 2781 int adjust = aielen - bo->bo_appie_len; 2782 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2783 bo->bo_tim_trailer_len); 2784 bo->bo_tim_trailer += adjust; 2785 bo->bo_appie += adjust; 2786 bo->bo_appie_len = aielen; 2787 2788 len_changed = 1; 2789 } 2790 frm = bo->bo_appie; 2791 if (aie != NULL) 2792 frm = add_appie(frm, aie); 2793 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2794 } 2795 IEEE80211_UNLOCK(ic); 2796 2797 return len_changed; 2798} 2799