ieee80211_output.c revision 191538
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 191538 2009-04-26 21:13:18Z sam $"); 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 /* XXX fragmented frames not handled */ 277 if (bpf_peers_present(vap->iv_rawbpf)) 278 bpf_mtap(vap->iv_rawbpf, m); 279 280 error = parent->if_transmit(parent, m); 281 if (error != 0) { 282 /* NB: IFQ_HANDOFF reclaims mbuf */ 283 ieee80211_free_node(ni); 284 } else { 285 ifp->if_opackets++; 286 } 287 ic->ic_lastdata = ticks; 288 } 289#undef IS_DWDS 290} 291 292/* 293 * 802.11 output routine. This is (currently) used only to 294 * connect bpf write calls to the 802.11 layer for injecting 295 * raw 802.11 frames. 296 */ 297int 298ieee80211_output(struct ifnet *ifp, struct mbuf *m, 299 struct sockaddr *dst, struct route *ro) 300{ 301#define senderr(e) do { error = (e); goto bad;} while (0) 302 struct ieee80211_node *ni = NULL; 303 struct ieee80211vap *vap; 304 struct ieee80211_frame *wh; 305 int error; 306 307 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 308 /* 309 * Short-circuit requests if the vap is marked OACTIVE 310 * as this is used when tearing down state to indicate 311 * the vap may be gone. This can also happen because a 312 * packet came down through ieee80211_start before the 313 * vap entered RUN state in which case it's also ok to 314 * just drop the frame. This should not be necessary 315 * but callers of if_output don't check OACTIVE. 316 */ 317 senderr(ENETDOWN); 318 } 319 vap = ifp->if_softc; 320 /* 321 * Hand to the 802.3 code if not tagged as 322 * a raw 802.11 frame. 323 */ 324 if (dst->sa_family != AF_IEEE80211) 325 return vap->iv_output(ifp, m, dst, ro); 326#ifdef MAC 327 error = mac_check_ifnet_transmit(ifp, m); 328 if (error) 329 senderr(error); 330#endif 331 if (ifp->if_flags & IFF_MONITOR) 332 senderr(ENETDOWN); 333 if (!IFNET_IS_UP_RUNNING(ifp)) 334 senderr(ENETDOWN); 335 if (vap->iv_state == IEEE80211_S_CAC) { 336 IEEE80211_DPRINTF(vap, 337 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 338 "block %s frame in CAC state\n", "raw data"); 339 vap->iv_stats.is_tx_badstate++; 340 senderr(EIO); /* XXX */ 341 } 342 /* XXX bypass bridge, pfil, carp, etc. */ 343 344 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 345 senderr(EIO); /* XXX */ 346 wh = mtod(m, struct ieee80211_frame *); 347 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 348 IEEE80211_FC0_VERSION_0) 349 senderr(EIO); /* XXX */ 350 351 /* locate destination node */ 352 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 353 case IEEE80211_FC1_DIR_NODS: 354 case IEEE80211_FC1_DIR_FROMDS: 355 ni = ieee80211_find_txnode(vap, wh->i_addr1); 356 break; 357 case IEEE80211_FC1_DIR_TODS: 358 case IEEE80211_FC1_DIR_DSTODS: 359 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 360 senderr(EIO); /* XXX */ 361 ni = ieee80211_find_txnode(vap, wh->i_addr3); 362 break; 363 default: 364 senderr(EIO); /* XXX */ 365 } 366 if (ni == NULL) { 367 /* 368 * Permit packets w/ bpf params through regardless 369 * (see below about sa_len). 370 */ 371 if (dst->sa_len == 0) 372 senderr(EHOSTUNREACH); 373 ni = ieee80211_ref_node(vap->iv_bss); 374 } 375 376 /* 377 * Sanitize mbuf for net80211 flags leaked from above. 378 * 379 * NB: This must be done before ieee80211_classify as 380 * it marks EAPOL in frames with M_EAPOL. 381 */ 382 m->m_flags &= ~M_80211_TX; 383 384 /* calculate priority so drivers can find the tx queue */ 385 /* XXX assumes an 802.3 frame */ 386 if (ieee80211_classify(ni, m)) 387 senderr(EIO); /* XXX */ 388 389 if (bpf_peers_present(vap->iv_rawbpf)) 390 bpf_mtap(vap->iv_rawbpf, m); 391 392 IEEE80211_NODE_STAT(ni, tx_data); 393 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 394 IEEE80211_NODE_STAT(ni, tx_mcast); 395 m->m_flags |= M_MCAST; 396 } else 397 IEEE80211_NODE_STAT(ni, tx_ucast); 398 /* NB: ieee80211_encap does not include 802.11 header */ 399 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 400 401 /* 402 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 403 * present by setting the sa_len field of the sockaddr (yes, 404 * this is a hack). 405 * NB: we assume sa_data is suitably aligned to cast. 406 */ 407 return vap->iv_ic->ic_raw_xmit(ni, m, 408 (const struct ieee80211_bpf_params *)(dst->sa_len ? 409 dst->sa_data : NULL)); 410bad: 411 if (m != NULL) 412 m_freem(m); 413 if (ni != NULL) 414 ieee80211_free_node(ni); 415 return error; 416#undef senderr 417} 418 419/* 420 * Set the direction field and address fields of an outgoing 421 * frame. Note this should be called early on in constructing 422 * a frame as it sets i_fc[1]; other bits can then be or'd in. 423 */ 424static void 425ieee80211_send_setup( 426 struct ieee80211_node *ni, 427 struct ieee80211_frame *wh, 428 int type, int tid, 429 const uint8_t sa[IEEE80211_ADDR_LEN], 430 const uint8_t da[IEEE80211_ADDR_LEN], 431 const uint8_t bssid[IEEE80211_ADDR_LEN]) 432{ 433#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 434 435 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 436 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 437 struct ieee80211vap *vap = ni->ni_vap; 438 439 switch (vap->iv_opmode) { 440 case IEEE80211_M_STA: 441 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 442 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 443 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 444 IEEE80211_ADDR_COPY(wh->i_addr3, da); 445 break; 446 case IEEE80211_M_IBSS: 447 case IEEE80211_M_AHDEMO: 448 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 449 IEEE80211_ADDR_COPY(wh->i_addr1, da); 450 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 451 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 452 break; 453 case IEEE80211_M_HOSTAP: 454 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 455 IEEE80211_ADDR_COPY(wh->i_addr1, da); 456 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 457 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 458 break; 459 case IEEE80211_M_WDS: 460 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 461 IEEE80211_ADDR_COPY(wh->i_addr1, da); 462 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 463 IEEE80211_ADDR_COPY(wh->i_addr3, da); 464 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 465 break; 466 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 467 break; 468 } 469 } else { 470 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 471 IEEE80211_ADDR_COPY(wh->i_addr1, da); 472 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 473 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 474 } 475 *(uint16_t *)&wh->i_dur[0] = 0; 476 *(uint16_t *)&wh->i_seq[0] = 477 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 478 ni->ni_txseqs[tid]++; 479#undef WH4 480} 481 482/* 483 * Send a management frame to the specified node. The node pointer 484 * must have a reference as the pointer will be passed to the driver 485 * and potentially held for a long time. If the frame is successfully 486 * dispatched to the driver, then it is responsible for freeing the 487 * reference (and potentially free'ing up any associated storage); 488 * otherwise deal with reclaiming any reference (on error). 489 */ 490int 491ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 492 struct ieee80211_bpf_params *params) 493{ 494 struct ieee80211vap *vap = ni->ni_vap; 495 struct ieee80211com *ic = ni->ni_ic; 496 struct ieee80211_frame *wh; 497 498 KASSERT(ni != NULL, ("null node")); 499 500 if (vap->iv_state == IEEE80211_S_CAC) { 501 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 502 ni, "block %s frame in CAC state", 503 ieee80211_mgt_subtype_name[ 504 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 505 IEEE80211_FC0_SUBTYPE_SHIFT]); 506 vap->iv_stats.is_tx_badstate++; 507 ieee80211_free_node(ni); 508 m_freem(m); 509 return EIO; /* XXX */ 510 } 511 512 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 513 if (m == NULL) { 514 ieee80211_free_node(ni); 515 return ENOMEM; 516 } 517 518 wh = mtod(m, struct ieee80211_frame *); 519 ieee80211_send_setup(ni, wh, 520 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 521 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 522 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 523 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 524 "encrypting frame (%s)", __func__); 525 wh->i_fc[1] |= IEEE80211_FC1_WEP; 526 } 527 m->m_flags |= M_ENCAP; /* mark encapsulated */ 528 529 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 530 M_WME_SETAC(m, params->ibp_pri); 531 532#ifdef IEEE80211_DEBUG 533 /* avoid printing too many frames */ 534 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 535 ieee80211_msg_dumppkts(vap)) { 536 printf("[%s] send %s on channel %u\n", 537 ether_sprintf(wh->i_addr1), 538 ieee80211_mgt_subtype_name[ 539 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 540 IEEE80211_FC0_SUBTYPE_SHIFT], 541 ieee80211_chan2ieee(ic, ic->ic_curchan)); 542 } 543#endif 544 IEEE80211_NODE_STAT(ni, tx_mgmt); 545 546 return ic->ic_raw_xmit(ni, m, params); 547} 548 549/* 550 * Send a null data frame to the specified node. If the station 551 * is setup for QoS then a QoS Null Data frame is constructed. 552 * If this is a WDS station then a 4-address frame is constructed. 553 * 554 * NB: the caller is assumed to have setup a node reference 555 * for use; this is necessary to deal with a race condition 556 * when probing for inactive stations. Like ieee80211_mgmt_output 557 * we must cleanup any node reference on error; however we 558 * can safely just unref it as we know it will never be the 559 * last reference to the node. 560 */ 561int 562ieee80211_send_nulldata(struct ieee80211_node *ni) 563{ 564 struct ieee80211vap *vap = ni->ni_vap; 565 struct ieee80211com *ic = ni->ni_ic; 566 struct mbuf *m; 567 struct ieee80211_frame *wh; 568 int hdrlen; 569 uint8_t *frm; 570 571 if (vap->iv_state == IEEE80211_S_CAC) { 572 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 573 ni, "block %s frame in CAC state", "null data"); 574 ieee80211_unref_node(&ni); 575 vap->iv_stats.is_tx_badstate++; 576 return EIO; /* XXX */ 577 } 578 579 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 580 hdrlen = sizeof(struct ieee80211_qosframe); 581 else 582 hdrlen = sizeof(struct ieee80211_frame); 583 /* NB: only WDS vap's get 4-address frames */ 584 if (vap->iv_opmode == IEEE80211_M_WDS) 585 hdrlen += IEEE80211_ADDR_LEN; 586 if (ic->ic_flags & IEEE80211_F_DATAPAD) 587 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 588 589 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 590 if (m == NULL) { 591 /* XXX debug msg */ 592 ieee80211_unref_node(&ni); 593 vap->iv_stats.is_tx_nobuf++; 594 return ENOMEM; 595 } 596 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 597 ("leading space %zd", M_LEADINGSPACE(m))); 598 M_PREPEND(m, hdrlen, M_DONTWAIT); 599 if (m == NULL) { 600 /* NB: cannot happen */ 601 ieee80211_free_node(ni); 602 return ENOMEM; 603 } 604 605 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 606 if (ni->ni_flags & IEEE80211_NODE_QOS) { 607 const int tid = WME_AC_TO_TID(WME_AC_BE); 608 uint8_t *qos; 609 610 ieee80211_send_setup(ni, wh, 611 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 612 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 613 614 if (vap->iv_opmode == IEEE80211_M_WDS) 615 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 616 else 617 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 618 qos[0] = tid & IEEE80211_QOS_TID; 619 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 620 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 621 qos[1] = 0; 622 } else { 623 ieee80211_send_setup(ni, wh, 624 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 625 IEEE80211_NONQOS_TID, 626 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 627 } 628 if (vap->iv_opmode != IEEE80211_M_WDS) { 629 /* NB: power management bit is never sent by an AP */ 630 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 631 vap->iv_opmode != IEEE80211_M_HOSTAP) 632 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 633 } 634 m->m_len = m->m_pkthdr.len = hdrlen; 635 m->m_flags |= M_ENCAP; /* mark encapsulated */ 636 637 M_WME_SETAC(m, WME_AC_BE); 638 639 IEEE80211_NODE_STAT(ni, tx_data); 640 641 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 642 "send %snull data frame on channel %u, pwr mgt %s", 643 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 644 ieee80211_chan2ieee(ic, ic->ic_curchan), 645 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 646 647 return ic->ic_raw_xmit(ni, m, NULL); 648} 649 650/* 651 * Assign priority to a frame based on any vlan tag assigned 652 * to the station and/or any Diffserv setting in an IP header. 653 * Finally, if an ACM policy is setup (in station mode) it's 654 * applied. 655 */ 656int 657ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 658{ 659 const struct ether_header *eh = mtod(m, struct ether_header *); 660 int v_wme_ac, d_wme_ac, ac; 661 662 /* 663 * Always promote PAE/EAPOL frames to high priority. 664 */ 665 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 666 /* NB: mark so others don't need to check header */ 667 m->m_flags |= M_EAPOL; 668 ac = WME_AC_VO; 669 goto done; 670 } 671 /* 672 * Non-qos traffic goes to BE. 673 */ 674 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 675 ac = WME_AC_BE; 676 goto done; 677 } 678 679 /* 680 * If node has a vlan tag then all traffic 681 * to it must have a matching tag. 682 */ 683 v_wme_ac = 0; 684 if (ni->ni_vlan != 0) { 685 if ((m->m_flags & M_VLANTAG) == 0) { 686 IEEE80211_NODE_STAT(ni, tx_novlantag); 687 return 1; 688 } 689 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 690 EVL_VLANOFTAG(ni->ni_vlan)) { 691 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 692 return 1; 693 } 694 /* map vlan priority to AC */ 695 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 696 } 697 698#ifdef INET 699 if (eh->ether_type == htons(ETHERTYPE_IP)) { 700 uint8_t tos; 701 /* 702 * IP frame, map the DSCP bits from the TOS field. 703 */ 704 /* XXX m_copydata may be too slow for fast path */ 705 /* NB: ip header may not be in first mbuf */ 706 m_copydata(m, sizeof(struct ether_header) + 707 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 708 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 709 d_wme_ac = TID_TO_WME_AC(tos); 710 } else { 711#endif /* INET */ 712 d_wme_ac = WME_AC_BE; 713#ifdef INET 714 } 715#endif 716 /* 717 * Use highest priority AC. 718 */ 719 if (v_wme_ac > d_wme_ac) 720 ac = v_wme_ac; 721 else 722 ac = d_wme_ac; 723 724 /* 725 * Apply ACM policy. 726 */ 727 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 728 static const int acmap[4] = { 729 WME_AC_BK, /* WME_AC_BE */ 730 WME_AC_BK, /* WME_AC_BK */ 731 WME_AC_BE, /* WME_AC_VI */ 732 WME_AC_VI, /* WME_AC_VO */ 733 }; 734 struct ieee80211com *ic = ni->ni_ic; 735 736 while (ac != WME_AC_BK && 737 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 738 ac = acmap[ac]; 739 } 740done: 741 M_WME_SETAC(m, ac); 742 return 0; 743} 744 745/* 746 * Insure there is sufficient contiguous space to encapsulate the 747 * 802.11 data frame. If room isn't already there, arrange for it. 748 * Drivers and cipher modules assume we have done the necessary work 749 * and fail rudely if they don't find the space they need. 750 */ 751struct mbuf * 752ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 753 struct ieee80211_key *key, struct mbuf *m) 754{ 755#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 756 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 757 758 if (key != NULL) { 759 /* XXX belongs in crypto code? */ 760 needed_space += key->wk_cipher->ic_header; 761 /* XXX frags */ 762 /* 763 * When crypto is being done in the host we must insure 764 * the data are writable for the cipher routines; clone 765 * a writable mbuf chain. 766 * XXX handle SWMIC specially 767 */ 768 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 769 m = m_unshare(m, M_NOWAIT); 770 if (m == NULL) { 771 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 772 "%s: cannot get writable mbuf\n", __func__); 773 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 774 return NULL; 775 } 776 } 777 } 778 /* 779 * We know we are called just before stripping an Ethernet 780 * header and prepending an LLC header. This means we know 781 * there will be 782 * sizeof(struct ether_header) - sizeof(struct llc) 783 * bytes recovered to which we need additional space for the 784 * 802.11 header and any crypto header. 785 */ 786 /* XXX check trailing space and copy instead? */ 787 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 788 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 789 if (n == NULL) { 790 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 791 "%s: cannot expand storage\n", __func__); 792 vap->iv_stats.is_tx_nobuf++; 793 m_freem(m); 794 return NULL; 795 } 796 KASSERT(needed_space <= MHLEN, 797 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 798 /* 799 * Setup new mbuf to have leading space to prepend the 800 * 802.11 header and any crypto header bits that are 801 * required (the latter are added when the driver calls 802 * back to ieee80211_crypto_encap to do crypto encapsulation). 803 */ 804 /* NB: must be first 'cuz it clobbers m_data */ 805 m_move_pkthdr(n, m); 806 n->m_len = 0; /* NB: m_gethdr does not set */ 807 n->m_data += needed_space; 808 /* 809 * Pull up Ethernet header to create the expected layout. 810 * We could use m_pullup but that's overkill (i.e. we don't 811 * need the actual data) and it cannot fail so do it inline 812 * for speed. 813 */ 814 /* NB: struct ether_header is known to be contiguous */ 815 n->m_len += sizeof(struct ether_header); 816 m->m_len -= sizeof(struct ether_header); 817 m->m_data += sizeof(struct ether_header); 818 /* 819 * Replace the head of the chain. 820 */ 821 n->m_next = m; 822 m = n; 823 } 824 return m; 825#undef TO_BE_RECLAIMED 826} 827 828/* 829 * Return the transmit key to use in sending a unicast frame. 830 * If a unicast key is set we use that. When no unicast key is set 831 * we fall back to the default transmit key. 832 */ 833static __inline struct ieee80211_key * 834ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 835 struct ieee80211_node *ni) 836{ 837 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 838 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 839 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 840 return NULL; 841 return &vap->iv_nw_keys[vap->iv_def_txkey]; 842 } else { 843 return &ni->ni_ucastkey; 844 } 845} 846 847/* 848 * Return the transmit key to use in sending a multicast frame. 849 * Multicast traffic always uses the group key which is installed as 850 * the default tx key. 851 */ 852static __inline struct ieee80211_key * 853ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 854 struct ieee80211_node *ni) 855{ 856 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 857 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 858 return NULL; 859 return &vap->iv_nw_keys[vap->iv_def_txkey]; 860} 861 862/* 863 * Encapsulate an outbound data frame. The mbuf chain is updated. 864 * If an error is encountered NULL is returned. The caller is required 865 * to provide a node reference and pullup the ethernet header in the 866 * first mbuf. 867 * 868 * NB: Packet is assumed to be processed by ieee80211_classify which 869 * marked EAPOL frames w/ M_EAPOL. 870 */ 871struct mbuf * 872ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 873 struct mbuf *m) 874{ 875#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 876 struct ieee80211com *ic = ni->ni_ic; 877 struct ether_header eh; 878 struct ieee80211_frame *wh; 879 struct ieee80211_key *key; 880 struct llc *llc; 881 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 882 883 /* 884 * Copy existing Ethernet header to a safe place. The 885 * rest of the code assumes it's ok to strip it when 886 * reorganizing state for the final encapsulation. 887 */ 888 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 889 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 890 891 /* 892 * Insure space for additional headers. First identify 893 * transmit key to use in calculating any buffer adjustments 894 * required. This is also used below to do privacy 895 * encapsulation work. Then calculate the 802.11 header 896 * size and any padding required by the driver. 897 * 898 * Note key may be NULL if we fall back to the default 899 * transmit key and that is not set. In that case the 900 * buffer may not be expanded as needed by the cipher 901 * routines, but they will/should discard it. 902 */ 903 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 904 if (vap->iv_opmode == IEEE80211_M_STA || 905 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 906 (vap->iv_opmode == IEEE80211_M_WDS && 907 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 908 key = ieee80211_crypto_getucastkey(vap, ni); 909 else 910 key = ieee80211_crypto_getmcastkey(vap, ni); 911 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 912 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 913 eh.ether_dhost, 914 "no default transmit key (%s) deftxkey %u", 915 __func__, vap->iv_def_txkey); 916 vap->iv_stats.is_tx_nodefkey++; 917 goto bad; 918 } 919 } else 920 key = NULL; 921 /* 922 * XXX Some ap's don't handle QoS-encapsulated EAPOL 923 * frames so suppress use. This may be an issue if other 924 * ap's require all data frames to be QoS-encapsulated 925 * once negotiated in which case we'll need to make this 926 * configurable. 927 */ 928 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 929 (m->m_flags & M_EAPOL) == 0; 930 if (addqos) 931 hdrsize = sizeof(struct ieee80211_qosframe); 932 else 933 hdrsize = sizeof(struct ieee80211_frame); 934 /* 935 * 4-address frames need to be generated for: 936 * o packets sent through a WDS vap (IEEE80211_M_WDS) 937 * o packets relayed by a station operating with dynamic WDS 938 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 939 */ 940 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 941 (vap->iv_opmode == IEEE80211_M_STA && 942 (vap->iv_flags & IEEE80211_F_DWDS) && 943 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 944 if (is4addr) 945 hdrsize += IEEE80211_ADDR_LEN; 946 /* 947 * Honor driver DATAPAD requirement. 948 */ 949 if (ic->ic_flags & IEEE80211_F_DATAPAD) 950 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 951 else 952 hdrspace = hdrsize; 953 954 if (__predict_true((m->m_flags & M_FF) == 0)) { 955 /* 956 * Normal frame. 957 */ 958 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 959 if (m == NULL) { 960 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 961 goto bad; 962 } 963 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 964 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 965 llc = mtod(m, struct llc *); 966 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 967 llc->llc_control = LLC_UI; 968 llc->llc_snap.org_code[0] = 0; 969 llc->llc_snap.org_code[1] = 0; 970 llc->llc_snap.org_code[2] = 0; 971 llc->llc_snap.ether_type = eh.ether_type; 972 } else { 973#ifdef IEEE80211_SUPPORT_SUPERG 974 /* 975 * Aggregated frame. 976 */ 977 m = ieee80211_ff_encap(vap, m, hdrspace, key); 978 if (m == NULL) 979#endif 980 goto bad; 981 } 982 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 983 984 M_PREPEND(m, hdrspace, M_DONTWAIT); 985 if (m == NULL) { 986 vap->iv_stats.is_tx_nobuf++; 987 goto bad; 988 } 989 wh = mtod(m, struct ieee80211_frame *); 990 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 991 *(uint16_t *)wh->i_dur = 0; 992 if (is4addr) { 993 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 994 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 995 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 996 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 997 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 998 } else switch (vap->iv_opmode) { 999 case IEEE80211_M_STA: 1000 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1001 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1002 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1003 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1004 break; 1005 case IEEE80211_M_IBSS: 1006 case IEEE80211_M_AHDEMO: 1007 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1008 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1009 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1010 /* 1011 * NB: always use the bssid from iv_bss as the 1012 * neighbor's may be stale after an ibss merge 1013 */ 1014 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1015 break; 1016 case IEEE80211_M_HOSTAP: 1017 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1018 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1019 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1020 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1021 break; 1022 case IEEE80211_M_MONITOR: 1023 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1024 goto bad; 1025 } 1026 if (m->m_flags & M_MORE_DATA) 1027 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1028 if (addqos) { 1029 uint8_t *qos; 1030 int ac, tid; 1031 1032 if (is4addr) { 1033 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1034 } else 1035 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1036 ac = M_WME_GETAC(m); 1037 /* map from access class/queue to 11e header priorty value */ 1038 tid = WME_AC_TO_TID(ac); 1039 qos[0] = tid & IEEE80211_QOS_TID; 1040 /* 1041 * Check if A-MPDU tx aggregation is setup or if we 1042 * should try to enable it. The sta must be associated 1043 * with HT and A-MPDU enabled for use. When the policy 1044 * routine decides we should enable A-MPDU we issue an 1045 * ADDBA request and wait for a reply. The frame being 1046 * encapsulated will go out w/o using A-MPDU, or possibly 1047 * it might be collected by the driver and held/retransmit. 1048 * The default ic_ampdu_enable routine handles staggering 1049 * ADDBA requests in case the receiver NAK's us or we are 1050 * otherwise unable to establish a BA stream. 1051 */ 1052 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1053 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1054 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1055 1056 ieee80211_txampdu_count_packet(tap); 1057 if (IEEE80211_AMPDU_RUNNING(tap)) { 1058 /* 1059 * Operational, mark frame for aggregation. 1060 * 1061 * NB: We support only immediate BA's for 1062 * AMPDU which means we set the QoS control 1063 * field to "normal ack" (0) to get "implicit 1064 * block ack" behaviour. 1065 */ 1066 m->m_flags |= M_AMPDU_MPDU; 1067 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1068 ic->ic_ampdu_enable(ni, tap)) { 1069 /* 1070 * Not negotiated yet, request service. 1071 */ 1072 ieee80211_ampdu_request(ni, tap); 1073 } 1074 } 1075 /* XXX works even when BA marked above */ 1076 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1077 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1078 qos[1] = 0; 1079 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1080 1081 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1082 /* 1083 * NB: don't assign a sequence # to potential 1084 * aggregates; we expect this happens at the 1085 * point the frame comes off any aggregation q 1086 * as otherwise we may introduce holes in the 1087 * BA sequence space and/or make window accouting 1088 * more difficult. 1089 * 1090 * XXX may want to control this with a driver 1091 * capability; this may also change when we pull 1092 * aggregation up into net80211 1093 */ 1094 *(uint16_t *)wh->i_seq = 1095 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1096 ni->ni_txseqs[tid]++; 1097 } 1098 } else { 1099 *(uint16_t *)wh->i_seq = 1100 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1101 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1102 } 1103 /* check if xmit fragmentation is required */ 1104 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1105 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1106 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1107 (m->m_flags & M_FF) == 0); /* NB: don't fragment ff's */ 1108 if (key != NULL) { 1109 /* 1110 * IEEE 802.1X: send EAPOL frames always in the clear. 1111 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1112 */ 1113 if ((m->m_flags & M_EAPOL) == 0 || 1114 ((vap->iv_flags & IEEE80211_F_WPA) && 1115 (vap->iv_opmode == IEEE80211_M_STA ? 1116 !IEEE80211_KEY_UNDEFINED(key) : 1117 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1118 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1119 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1120 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1121 eh.ether_dhost, 1122 "%s", "enmic failed, discard frame"); 1123 vap->iv_stats.is_crypto_enmicfail++; 1124 goto bad; 1125 } 1126 } 1127 } 1128 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1129 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1130 goto bad; 1131 1132 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1133 1134 IEEE80211_NODE_STAT(ni, tx_data); 1135 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1136 IEEE80211_NODE_STAT(ni, tx_mcast); 1137 else 1138 IEEE80211_NODE_STAT(ni, tx_ucast); 1139 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1140 1141 /* XXX fragmented frames not handled */ 1142 if (bpf_peers_present(vap->iv_rawbpf)) 1143 bpf_mtap(vap->iv_rawbpf, m); 1144 1145 return m; 1146bad: 1147 if (m != NULL) 1148 m_freem(m); 1149 return NULL; 1150#undef WH4 1151} 1152 1153/* 1154 * Fragment the frame according to the specified mtu. 1155 * The size of the 802.11 header (w/o padding) is provided 1156 * so we don't need to recalculate it. We create a new 1157 * mbuf for each fragment and chain it through m_nextpkt; 1158 * we might be able to optimize this by reusing the original 1159 * packet's mbufs but that is significantly more complicated. 1160 */ 1161static int 1162ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1163 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1164{ 1165 struct ieee80211_frame *wh, *whf; 1166 struct mbuf *m, *prev, *next; 1167 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1168 1169 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1170 KASSERT(m0->m_pkthdr.len > mtu, 1171 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1172 1173 wh = mtod(m0, struct ieee80211_frame *); 1174 /* NB: mark the first frag; it will be propagated below */ 1175 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1176 totalhdrsize = hdrsize + ciphdrsize; 1177 fragno = 1; 1178 off = mtu - ciphdrsize; 1179 remainder = m0->m_pkthdr.len - off; 1180 prev = m0; 1181 do { 1182 fragsize = totalhdrsize + remainder; 1183 if (fragsize > mtu) 1184 fragsize = mtu; 1185 /* XXX fragsize can be >2048! */ 1186 KASSERT(fragsize < MCLBYTES, 1187 ("fragment size %u too big!", fragsize)); 1188 if (fragsize > MHLEN) 1189 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1190 else 1191 m = m_gethdr(M_DONTWAIT, MT_DATA); 1192 if (m == NULL) 1193 goto bad; 1194 /* leave room to prepend any cipher header */ 1195 m_align(m, fragsize - ciphdrsize); 1196 1197 /* 1198 * Form the header in the fragment. Note that since 1199 * we mark the first fragment with the MORE_FRAG bit 1200 * it automatically is propagated to each fragment; we 1201 * need only clear it on the last fragment (done below). 1202 */ 1203 whf = mtod(m, struct ieee80211_frame *); 1204 memcpy(whf, wh, hdrsize); 1205 *(uint16_t *)&whf->i_seq[0] |= htole16( 1206 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1207 IEEE80211_SEQ_FRAG_SHIFT); 1208 fragno++; 1209 1210 payload = fragsize - totalhdrsize; 1211 /* NB: destination is known to be contiguous */ 1212 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1213 m->m_len = hdrsize + payload; 1214 m->m_pkthdr.len = hdrsize + payload; 1215 m->m_flags |= M_FRAG; 1216 1217 /* chain up the fragment */ 1218 prev->m_nextpkt = m; 1219 prev = m; 1220 1221 /* deduct fragment just formed */ 1222 remainder -= payload; 1223 off += payload; 1224 } while (remainder != 0); 1225 1226 /* set the last fragment */ 1227 m->m_flags |= M_LASTFRAG; 1228 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1229 1230 /* strip first mbuf now that everything has been copied */ 1231 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1232 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1233 1234 vap->iv_stats.is_tx_fragframes++; 1235 vap->iv_stats.is_tx_frags += fragno-1; 1236 1237 return 1; 1238bad: 1239 /* reclaim fragments but leave original frame for caller to free */ 1240 for (m = m0->m_nextpkt; m != NULL; m = next) { 1241 next = m->m_nextpkt; 1242 m->m_nextpkt = NULL; /* XXX paranoid */ 1243 m_freem(m); 1244 } 1245 m0->m_nextpkt = NULL; 1246 return 0; 1247} 1248 1249/* 1250 * Add a supported rates element id to a frame. 1251 */ 1252static uint8_t * 1253ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1254{ 1255 int nrates; 1256 1257 *frm++ = IEEE80211_ELEMID_RATES; 1258 nrates = rs->rs_nrates; 1259 if (nrates > IEEE80211_RATE_SIZE) 1260 nrates = IEEE80211_RATE_SIZE; 1261 *frm++ = nrates; 1262 memcpy(frm, rs->rs_rates, nrates); 1263 return frm + nrates; 1264} 1265 1266/* 1267 * Add an extended supported rates element id to a frame. 1268 */ 1269static uint8_t * 1270ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1271{ 1272 /* 1273 * Add an extended supported rates element if operating in 11g mode. 1274 */ 1275 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1276 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1277 *frm++ = IEEE80211_ELEMID_XRATES; 1278 *frm++ = nrates; 1279 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1280 frm += nrates; 1281 } 1282 return frm; 1283} 1284 1285/* 1286 * Add an ssid element to a frame. 1287 */ 1288static uint8_t * 1289ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1290{ 1291 *frm++ = IEEE80211_ELEMID_SSID; 1292 *frm++ = len; 1293 memcpy(frm, ssid, len); 1294 return frm + len; 1295} 1296 1297/* 1298 * Add an erp element to a frame. 1299 */ 1300static uint8_t * 1301ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1302{ 1303 uint8_t erp; 1304 1305 *frm++ = IEEE80211_ELEMID_ERP; 1306 *frm++ = 1; 1307 erp = 0; 1308 if (ic->ic_nonerpsta != 0) 1309 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1310 if (ic->ic_flags & IEEE80211_F_USEPROT) 1311 erp |= IEEE80211_ERP_USE_PROTECTION; 1312 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1313 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1314 *frm++ = erp; 1315 return frm; 1316} 1317 1318/* 1319 * Add a CFParams element to a frame. 1320 */ 1321static uint8_t * 1322ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1323{ 1324#define ADDSHORT(frm, v) do { \ 1325 frm[0] = (v) & 0xff; \ 1326 frm[1] = (v) >> 8; \ 1327 frm += 2; \ 1328} while (0) 1329 *frm++ = IEEE80211_ELEMID_CFPARMS; 1330 *frm++ = 6; 1331 *frm++ = 0; /* CFP count */ 1332 *frm++ = 2; /* CFP period */ 1333 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1334 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1335 return frm; 1336#undef ADDSHORT 1337} 1338 1339static __inline uint8_t * 1340add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1341{ 1342 memcpy(frm, ie->ie_data, ie->ie_len); 1343 return frm + ie->ie_len; 1344} 1345 1346static __inline uint8_t * 1347add_ie(uint8_t *frm, const uint8_t *ie) 1348{ 1349 memcpy(frm, ie, 2 + ie[1]); 1350 return frm + 2 + ie[1]; 1351} 1352 1353#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1354/* 1355 * Add a WME information element to a frame. 1356 */ 1357static uint8_t * 1358ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1359{ 1360 static const struct ieee80211_wme_info info = { 1361 .wme_id = IEEE80211_ELEMID_VENDOR, 1362 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1363 .wme_oui = { WME_OUI_BYTES }, 1364 .wme_type = WME_OUI_TYPE, 1365 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1366 .wme_version = WME_VERSION, 1367 .wme_info = 0, 1368 }; 1369 memcpy(frm, &info, sizeof(info)); 1370 return frm + sizeof(info); 1371} 1372 1373/* 1374 * Add a WME parameters element to a frame. 1375 */ 1376static uint8_t * 1377ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1378{ 1379#define SM(_v, _f) (((_v) << _f##_S) & _f) 1380#define ADDSHORT(frm, v) do { \ 1381 frm[0] = (v) & 0xff; \ 1382 frm[1] = (v) >> 8; \ 1383 frm += 2; \ 1384} while (0) 1385 /* NB: this works 'cuz a param has an info at the front */ 1386 static const struct ieee80211_wme_info param = { 1387 .wme_id = IEEE80211_ELEMID_VENDOR, 1388 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1389 .wme_oui = { WME_OUI_BYTES }, 1390 .wme_type = WME_OUI_TYPE, 1391 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1392 .wme_version = WME_VERSION, 1393 }; 1394 int i; 1395 1396 memcpy(frm, ¶m, sizeof(param)); 1397 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1398 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1399 *frm++ = 0; /* reserved field */ 1400 for (i = 0; i < WME_NUM_AC; i++) { 1401 const struct wmeParams *ac = 1402 &wme->wme_bssChanParams.cap_wmeParams[i]; 1403 *frm++ = SM(i, WME_PARAM_ACI) 1404 | SM(ac->wmep_acm, WME_PARAM_ACM) 1405 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1406 ; 1407 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1408 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1409 ; 1410 ADDSHORT(frm, ac->wmep_txopLimit); 1411 } 1412 return frm; 1413#undef SM 1414#undef ADDSHORT 1415} 1416#undef WME_OUI_BYTES 1417 1418/* 1419 * Add an 11h Power Constraint element to a frame. 1420 */ 1421static uint8_t * 1422ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1423{ 1424 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1425 /* XXX per-vap tx power limit? */ 1426 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1427 1428 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1429 frm[1] = 1; 1430 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1431 return frm + 3; 1432} 1433 1434/* 1435 * Add an 11h Power Capability element to a frame. 1436 */ 1437static uint8_t * 1438ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1439{ 1440 frm[0] = IEEE80211_ELEMID_PWRCAP; 1441 frm[1] = 2; 1442 frm[2] = c->ic_minpower; 1443 frm[3] = c->ic_maxpower; 1444 return frm + 4; 1445} 1446 1447/* 1448 * Add an 11h Supported Channels element to a frame. 1449 */ 1450static uint8_t * 1451ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1452{ 1453 static const int ielen = 26; 1454 1455 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1456 frm[1] = ielen; 1457 /* XXX not correct */ 1458 memcpy(frm+2, ic->ic_chan_avail, ielen); 1459 return frm + 2 + ielen; 1460} 1461 1462/* 1463 * Add an 11h Channel Switch Announcement element to a frame. 1464 * Note that we use the per-vap CSA count to adjust the global 1465 * counter so we can use this routine to form probe response 1466 * frames and get the current count. 1467 */ 1468static uint8_t * 1469ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1470{ 1471 struct ieee80211com *ic = vap->iv_ic; 1472 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1473 1474 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1475 csa->csa_len = 3; 1476 csa->csa_mode = 1; /* XXX force quiet on channel */ 1477 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1478 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1479 return frm + sizeof(*csa); 1480} 1481 1482/* 1483 * Add an 11h country information element to a frame. 1484 */ 1485static uint8_t * 1486ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1487{ 1488 1489 if (ic->ic_countryie == NULL || 1490 ic->ic_countryie_chan != ic->ic_bsschan) { 1491 /* 1492 * Handle lazy construction of ie. This is done on 1493 * first use and after a channel change that requires 1494 * re-calculation. 1495 */ 1496 if (ic->ic_countryie != NULL) 1497 free(ic->ic_countryie, M_80211_NODE_IE); 1498 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1499 if (ic->ic_countryie == NULL) 1500 return frm; 1501 ic->ic_countryie_chan = ic->ic_bsschan; 1502 } 1503 return add_appie(frm, ic->ic_countryie); 1504} 1505 1506/* 1507 * Send a probe request frame with the specified ssid 1508 * and any optional information element data. 1509 */ 1510int 1511ieee80211_send_probereq(struct ieee80211_node *ni, 1512 const uint8_t sa[IEEE80211_ADDR_LEN], 1513 const uint8_t da[IEEE80211_ADDR_LEN], 1514 const uint8_t bssid[IEEE80211_ADDR_LEN], 1515 const uint8_t *ssid, size_t ssidlen) 1516{ 1517 struct ieee80211vap *vap = ni->ni_vap; 1518 struct ieee80211com *ic = ni->ni_ic; 1519 const struct ieee80211_txparam *tp; 1520 struct ieee80211_bpf_params params; 1521 struct ieee80211_frame *wh; 1522 const struct ieee80211_rateset *rs; 1523 struct mbuf *m; 1524 uint8_t *frm; 1525 1526 if (vap->iv_state == IEEE80211_S_CAC) { 1527 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1528 "block %s frame in CAC state", "probe request"); 1529 vap->iv_stats.is_tx_badstate++; 1530 return EIO; /* XXX */ 1531 } 1532 1533 /* 1534 * Hold a reference on the node so it doesn't go away until after 1535 * the xmit is complete all the way in the driver. On error we 1536 * will remove our reference. 1537 */ 1538 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1539 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1540 __func__, __LINE__, 1541 ni, ether_sprintf(ni->ni_macaddr), 1542 ieee80211_node_refcnt(ni)+1); 1543 ieee80211_ref_node(ni); 1544 1545 /* 1546 * prreq frame format 1547 * [tlv] ssid 1548 * [tlv] supported rates 1549 * [tlv] RSN (optional) 1550 * [tlv] extended supported rates 1551 * [tlv] WPA (optional) 1552 * [tlv] user-specified ie's 1553 */ 1554 m = ieee80211_getmgtframe(&frm, 1555 ic->ic_headroom + sizeof(struct ieee80211_frame), 1556 2 + IEEE80211_NWID_LEN 1557 + 2 + IEEE80211_RATE_SIZE 1558 + sizeof(struct ieee80211_ie_wpa) 1559 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1560 + sizeof(struct ieee80211_ie_wpa) 1561 + (vap->iv_appie_probereq != NULL ? 1562 vap->iv_appie_probereq->ie_len : 0) 1563 ); 1564 if (m == NULL) { 1565 vap->iv_stats.is_tx_nobuf++; 1566 ieee80211_free_node(ni); 1567 return ENOMEM; 1568 } 1569 1570 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1571 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1572 frm = ieee80211_add_rates(frm, rs); 1573 if (vap->iv_flags & IEEE80211_F_WPA2) { 1574 if (vap->iv_rsn_ie != NULL) 1575 frm = add_ie(frm, vap->iv_rsn_ie); 1576 /* XXX else complain? */ 1577 } 1578 frm = ieee80211_add_xrates(frm, rs); 1579 if (vap->iv_flags & IEEE80211_F_WPA1) { 1580 if (vap->iv_wpa_ie != NULL) 1581 frm = add_ie(frm, vap->iv_wpa_ie); 1582 /* XXX else complain? */ 1583 } 1584 if (vap->iv_appie_probereq != NULL) 1585 frm = add_appie(frm, vap->iv_appie_probereq); 1586 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1587 1588 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1589 ("leading space %zd", M_LEADINGSPACE(m))); 1590 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1591 if (m == NULL) { 1592 /* NB: cannot happen */ 1593 ieee80211_free_node(ni); 1594 return ENOMEM; 1595 } 1596 1597 wh = mtod(m, struct ieee80211_frame *); 1598 ieee80211_send_setup(ni, wh, 1599 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1600 IEEE80211_NONQOS_TID, sa, da, bssid); 1601 /* XXX power management? */ 1602 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1603 1604 M_WME_SETAC(m, WME_AC_BE); 1605 1606 IEEE80211_NODE_STAT(ni, tx_probereq); 1607 IEEE80211_NODE_STAT(ni, tx_mgmt); 1608 1609 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1610 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1611 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1612 ssidlen, ssid); 1613 1614 memset(¶ms, 0, sizeof(params)); 1615 params.ibp_pri = M_WME_GETAC(m); 1616 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1617 params.ibp_rate0 = tp->mgmtrate; 1618 if (IEEE80211_IS_MULTICAST(da)) { 1619 params.ibp_flags |= IEEE80211_BPF_NOACK; 1620 params.ibp_try0 = 1; 1621 } else 1622 params.ibp_try0 = tp->maxretry; 1623 params.ibp_power = ni->ni_txpower; 1624 return ic->ic_raw_xmit(ni, m, ¶ms); 1625} 1626 1627/* 1628 * Calculate capability information for mgt frames. 1629 */ 1630static uint16_t 1631getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1632{ 1633 struct ieee80211com *ic = vap->iv_ic; 1634 uint16_t capinfo; 1635 1636 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1637 1638 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1639 capinfo = IEEE80211_CAPINFO_ESS; 1640 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1641 capinfo = IEEE80211_CAPINFO_IBSS; 1642 else 1643 capinfo = 0; 1644 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1645 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1646 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1647 IEEE80211_IS_CHAN_2GHZ(chan)) 1648 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1649 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1650 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1651 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1652 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1653 return capinfo; 1654} 1655 1656/* 1657 * Send a management frame. The node is for the destination (or ic_bss 1658 * when in station mode). Nodes other than ic_bss have their reference 1659 * count bumped to reflect our use for an indeterminant time. 1660 */ 1661int 1662ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1663{ 1664#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1665#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1666 struct ieee80211vap *vap = ni->ni_vap; 1667 struct ieee80211com *ic = ni->ni_ic; 1668 struct ieee80211_node *bss = vap->iv_bss; 1669 struct ieee80211_bpf_params params; 1670 struct mbuf *m; 1671 uint8_t *frm; 1672 uint16_t capinfo; 1673 int has_challenge, is_shared_key, ret, status; 1674 1675 KASSERT(ni != NULL, ("null node")); 1676 1677 /* 1678 * Hold a reference on the node so it doesn't go away until after 1679 * the xmit is complete all the way in the driver. On error we 1680 * will remove our reference. 1681 */ 1682 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1683 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1684 __func__, __LINE__, 1685 ni, ether_sprintf(ni->ni_macaddr), 1686 ieee80211_node_refcnt(ni)+1); 1687 ieee80211_ref_node(ni); 1688 1689 memset(¶ms, 0, sizeof(params)); 1690 switch (type) { 1691 1692 case IEEE80211_FC0_SUBTYPE_AUTH: 1693 status = arg >> 16; 1694 arg &= 0xffff; 1695 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1696 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1697 ni->ni_challenge != NULL); 1698 1699 /* 1700 * Deduce whether we're doing open authentication or 1701 * shared key authentication. We do the latter if 1702 * we're in the middle of a shared key authentication 1703 * handshake or if we're initiating an authentication 1704 * request and configured to use shared key. 1705 */ 1706 is_shared_key = has_challenge || 1707 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1708 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1709 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1710 1711 m = ieee80211_getmgtframe(&frm, 1712 ic->ic_headroom + sizeof(struct ieee80211_frame), 1713 3 * sizeof(uint16_t) 1714 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1715 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1716 ); 1717 if (m == NULL) 1718 senderr(ENOMEM, is_tx_nobuf); 1719 1720 ((uint16_t *)frm)[0] = 1721 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1722 : htole16(IEEE80211_AUTH_ALG_OPEN); 1723 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1724 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1725 1726 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1727 ((uint16_t *)frm)[3] = 1728 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1729 IEEE80211_ELEMID_CHALLENGE); 1730 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1731 IEEE80211_CHALLENGE_LEN); 1732 m->m_pkthdr.len = m->m_len = 1733 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1734 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1735 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1736 "request encrypt frame (%s)", __func__); 1737 /* mark frame for encryption */ 1738 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1739 } 1740 } else 1741 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1742 1743 /* XXX not right for shared key */ 1744 if (status == IEEE80211_STATUS_SUCCESS) 1745 IEEE80211_NODE_STAT(ni, tx_auth); 1746 else 1747 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1748 1749 if (vap->iv_opmode == IEEE80211_M_STA) 1750 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1751 (void *) vap->iv_state); 1752 break; 1753 1754 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1755 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1756 "send station deauthenticate (reason %d)", arg); 1757 m = ieee80211_getmgtframe(&frm, 1758 ic->ic_headroom + sizeof(struct ieee80211_frame), 1759 sizeof(uint16_t)); 1760 if (m == NULL) 1761 senderr(ENOMEM, is_tx_nobuf); 1762 *(uint16_t *)frm = htole16(arg); /* reason */ 1763 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1764 1765 IEEE80211_NODE_STAT(ni, tx_deauth); 1766 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1767 1768 ieee80211_node_unauthorize(ni); /* port closed */ 1769 break; 1770 1771 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1772 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1773 /* 1774 * asreq frame format 1775 * [2] capability information 1776 * [2] listen interval 1777 * [6*] current AP address (reassoc only) 1778 * [tlv] ssid 1779 * [tlv] supported rates 1780 * [tlv] extended supported rates 1781 * [4] power capability (optional) 1782 * [28] supported channels (optional) 1783 * [tlv] HT capabilities 1784 * [tlv] WME (optional) 1785 * [tlv] Vendor OUI HT capabilities (optional) 1786 * [tlv] Atheros capabilities (if negotiated) 1787 * [tlv] AppIE's (optional) 1788 */ 1789 m = ieee80211_getmgtframe(&frm, 1790 ic->ic_headroom + sizeof(struct ieee80211_frame), 1791 sizeof(uint16_t) 1792 + sizeof(uint16_t) 1793 + IEEE80211_ADDR_LEN 1794 + 2 + IEEE80211_NWID_LEN 1795 + 2 + IEEE80211_RATE_SIZE 1796 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1797 + 4 1798 + 2 + 26 1799 + sizeof(struct ieee80211_wme_info) 1800 + sizeof(struct ieee80211_ie_htcap) 1801 + 4 + sizeof(struct ieee80211_ie_htcap) 1802#ifdef IEEE80211_SUPPORT_SUPERG 1803 + sizeof(struct ieee80211_ath_ie) 1804#endif 1805 + (vap->iv_appie_wpa != NULL ? 1806 vap->iv_appie_wpa->ie_len : 0) 1807 + (vap->iv_appie_assocreq != NULL ? 1808 vap->iv_appie_assocreq->ie_len : 0) 1809 ); 1810 if (m == NULL) 1811 senderr(ENOMEM, is_tx_nobuf); 1812 1813 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1814 ("wrong mode %u", vap->iv_opmode)); 1815 capinfo = IEEE80211_CAPINFO_ESS; 1816 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1817 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1818 /* 1819 * NB: Some 11a AP's reject the request when 1820 * short premable is set. 1821 */ 1822 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1823 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1824 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1825 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1826 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1827 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1828 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1829 (vap->iv_flags & IEEE80211_F_DOTH)) 1830 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1831 *(uint16_t *)frm = htole16(capinfo); 1832 frm += 2; 1833 1834 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1835 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1836 bss->ni_intval)); 1837 frm += 2; 1838 1839 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1840 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1841 frm += IEEE80211_ADDR_LEN; 1842 } 1843 1844 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1845 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1846 if (vap->iv_flags & IEEE80211_F_WPA2) { 1847 if (vap->iv_rsn_ie != NULL) 1848 frm = add_ie(frm, vap->iv_rsn_ie); 1849 /* XXX else complain? */ 1850 } 1851 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1852 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1853 frm = ieee80211_add_powercapability(frm, 1854 ic->ic_curchan); 1855 frm = ieee80211_add_supportedchannels(frm, ic); 1856 } 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_HTCAP) 1860 frm = ieee80211_add_htcap(frm, ni); 1861 if (vap->iv_flags & IEEE80211_F_WPA1) { 1862 if (vap->iv_wpa_ie != NULL) 1863 frm = add_ie(frm, vap->iv_wpa_ie); 1864 /* XXX else complain */ 1865 } 1866 if ((ic->ic_flags & IEEE80211_F_WME) && 1867 ni->ni_ies.wme_ie != NULL) 1868 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1869 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1870 ni->ni_ies.htcap_ie != NULL && 1871 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1872 frm = ieee80211_add_htcap_vendor(frm, ni); 1873#ifdef IEEE80211_SUPPORT_SUPERG 1874 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1875 frm = ieee80211_add_ath(frm, 1876 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1877 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1878 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1879 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1880 } 1881#endif /* IEEE80211_SUPPORT_SUPERG */ 1882 if (vap->iv_appie_assocreq != NULL) 1883 frm = add_appie(frm, vap->iv_appie_assocreq); 1884 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1885 1886 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1887 (void *) vap->iv_state); 1888 break; 1889 1890 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1891 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1892 /* 1893 * asresp frame format 1894 * [2] capability information 1895 * [2] status 1896 * [2] association ID 1897 * [tlv] supported rates 1898 * [tlv] extended supported rates 1899 * [tlv] HT capabilities (standard, if STA enabled) 1900 * [tlv] HT information (standard, if STA enabled) 1901 * [tlv] WME (if configured and STA enabled) 1902 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1903 * [tlv] HT information (vendor OUI, if STA enabled) 1904 * [tlv] Atheros capabilities (if STA enabled) 1905 * [tlv] AppIE's (optional) 1906 */ 1907 m = ieee80211_getmgtframe(&frm, 1908 ic->ic_headroom + sizeof(struct ieee80211_frame), 1909 sizeof(uint16_t) 1910 + sizeof(uint16_t) 1911 + sizeof(uint16_t) 1912 + 2 + IEEE80211_RATE_SIZE 1913 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1914 + sizeof(struct ieee80211_ie_htcap) + 4 1915 + sizeof(struct ieee80211_ie_htinfo) + 4 1916 + sizeof(struct ieee80211_wme_param) 1917#ifdef IEEE80211_SUPPORT_SUPERG 1918 + sizeof(struct ieee80211_ath_ie) 1919#endif 1920 + (vap->iv_appie_assocresp != NULL ? 1921 vap->iv_appie_assocresp->ie_len : 0) 1922 ); 1923 if (m == NULL) 1924 senderr(ENOMEM, is_tx_nobuf); 1925 1926 capinfo = getcapinfo(vap, bss->ni_chan); 1927 *(uint16_t *)frm = htole16(capinfo); 1928 frm += 2; 1929 1930 *(uint16_t *)frm = htole16(arg); /* status */ 1931 frm += 2; 1932 1933 if (arg == IEEE80211_STATUS_SUCCESS) { 1934 *(uint16_t *)frm = htole16(ni->ni_associd); 1935 IEEE80211_NODE_STAT(ni, tx_assoc); 1936 } else 1937 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1938 frm += 2; 1939 1940 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1941 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1942 /* NB: respond according to what we received */ 1943 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1944 frm = ieee80211_add_htcap(frm, ni); 1945 frm = ieee80211_add_htinfo(frm, ni); 1946 } 1947 if ((vap->iv_flags & IEEE80211_F_WME) && 1948 ni->ni_ies.wme_ie != NULL) 1949 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1950 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1951 frm = ieee80211_add_htcap_vendor(frm, ni); 1952 frm = ieee80211_add_htinfo_vendor(frm, ni); 1953 } 1954#ifdef IEEE80211_SUPPORT_SUPERG 1955 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1956 frm = ieee80211_add_ath(frm, 1957 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1958 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1959 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1960 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1961#endif /* IEEE80211_SUPPORT_SUPERG */ 1962 if (vap->iv_appie_assocresp != NULL) 1963 frm = add_appie(frm, vap->iv_appie_assocresp); 1964 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1965 break; 1966 1967 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1968 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1969 "send station disassociate (reason %d)", arg); 1970 m = ieee80211_getmgtframe(&frm, 1971 ic->ic_headroom + sizeof(struct ieee80211_frame), 1972 sizeof(uint16_t)); 1973 if (m == NULL) 1974 senderr(ENOMEM, is_tx_nobuf); 1975 *(uint16_t *)frm = htole16(arg); /* reason */ 1976 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1977 1978 IEEE80211_NODE_STAT(ni, tx_disassoc); 1979 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1980 break; 1981 1982 default: 1983 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1984 "invalid mgmt frame type %u", type); 1985 senderr(EINVAL, is_tx_unknownmgt); 1986 /* NOTREACHED */ 1987 } 1988 1989 /* NB: force non-ProbeResp frames to the highest queue */ 1990 params.ibp_pri = WME_AC_VO; 1991 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1992 /* NB: we know all frames are unicast */ 1993 params.ibp_try0 = bss->ni_txparms->maxretry; 1994 params.ibp_power = bss->ni_txpower; 1995 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1996bad: 1997 ieee80211_free_node(ni); 1998 return ret; 1999#undef senderr 2000#undef HTFLAGS 2001} 2002 2003/* 2004 * Return an mbuf with a probe response frame in it. 2005 * Space is left to prepend and 802.11 header at the 2006 * front but it's left to the caller to fill in. 2007 */ 2008struct mbuf * 2009ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2010{ 2011 struct ieee80211vap *vap = bss->ni_vap; 2012 struct ieee80211com *ic = bss->ni_ic; 2013 const struct ieee80211_rateset *rs; 2014 struct mbuf *m; 2015 uint16_t capinfo; 2016 uint8_t *frm; 2017 2018 /* 2019 * probe response frame format 2020 * [8] time stamp 2021 * [2] beacon interval 2022 * [2] cabability information 2023 * [tlv] ssid 2024 * [tlv] supported rates 2025 * [tlv] parameter set (FH/DS) 2026 * [tlv] parameter set (IBSS) 2027 * [tlv] country (optional) 2028 * [3] power control (optional) 2029 * [5] channel switch announcement (CSA) (optional) 2030 * [tlv] extended rate phy (ERP) 2031 * [tlv] extended supported rates 2032 * [tlv] RSN (optional) 2033 * [tlv] HT capabilities 2034 * [tlv] HT information 2035 * [tlv] WPA (optional) 2036 * [tlv] WME (optional) 2037 * [tlv] Vendor OUI HT capabilities (optional) 2038 * [tlv] Vendor OUI HT information (optional) 2039 * [tlv] Atheros capabilities 2040 * [tlv] AppIE's (optional) 2041 */ 2042 m = ieee80211_getmgtframe(&frm, 2043 ic->ic_headroom + sizeof(struct ieee80211_frame), 2044 8 2045 + sizeof(uint16_t) 2046 + sizeof(uint16_t) 2047 + 2 + IEEE80211_NWID_LEN 2048 + 2 + IEEE80211_RATE_SIZE 2049 + 7 /* max(7,3) */ 2050 + IEEE80211_COUNTRY_MAX_SIZE 2051 + 3 2052 + sizeof(struct ieee80211_csa_ie) 2053 + 3 2054 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2055 + sizeof(struct ieee80211_ie_wpa) 2056 + sizeof(struct ieee80211_ie_htcap) 2057 + sizeof(struct ieee80211_ie_htinfo) 2058 + sizeof(struct ieee80211_ie_wpa) 2059 + sizeof(struct ieee80211_wme_param) 2060 + 4 + sizeof(struct ieee80211_ie_htcap) 2061 + 4 + sizeof(struct ieee80211_ie_htinfo) 2062#ifdef IEEE80211_SUPPORT_SUPERG 2063 + sizeof(struct ieee80211_ath_ie) 2064#endif 2065 + (vap->iv_appie_proberesp != NULL ? 2066 vap->iv_appie_proberesp->ie_len : 0) 2067 ); 2068 if (m == NULL) { 2069 vap->iv_stats.is_tx_nobuf++; 2070 return NULL; 2071 } 2072 2073 memset(frm, 0, 8); /* timestamp should be filled later */ 2074 frm += 8; 2075 *(uint16_t *)frm = htole16(bss->ni_intval); 2076 frm += 2; 2077 capinfo = getcapinfo(vap, bss->ni_chan); 2078 *(uint16_t *)frm = htole16(capinfo); 2079 frm += 2; 2080 2081 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2082 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2083 frm = ieee80211_add_rates(frm, rs); 2084 2085 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2086 *frm++ = IEEE80211_ELEMID_FHPARMS; 2087 *frm++ = 5; 2088 *frm++ = bss->ni_fhdwell & 0x00ff; 2089 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2090 *frm++ = IEEE80211_FH_CHANSET( 2091 ieee80211_chan2ieee(ic, bss->ni_chan)); 2092 *frm++ = IEEE80211_FH_CHANPAT( 2093 ieee80211_chan2ieee(ic, bss->ni_chan)); 2094 *frm++ = bss->ni_fhindex; 2095 } else { 2096 *frm++ = IEEE80211_ELEMID_DSPARMS; 2097 *frm++ = 1; 2098 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2099 } 2100 2101 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2102 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2103 *frm++ = 2; 2104 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2105 } 2106 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2107 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2108 frm = ieee80211_add_countryie(frm, ic); 2109 if (vap->iv_flags & IEEE80211_F_DOTH) { 2110 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2111 frm = ieee80211_add_powerconstraint(frm, vap); 2112 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2113 frm = ieee80211_add_csa(frm, vap); 2114 } 2115 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2116 frm = ieee80211_add_erp(frm, ic); 2117 frm = ieee80211_add_xrates(frm, rs); 2118 if (vap->iv_flags & IEEE80211_F_WPA2) { 2119 if (vap->iv_rsn_ie != NULL) 2120 frm = add_ie(frm, vap->iv_rsn_ie); 2121 /* XXX else complain? */ 2122 } 2123 /* 2124 * NB: legacy 11b clients do not get certain ie's. 2125 * The caller identifies such clients by passing 2126 * a token in legacy to us. Could expand this to be 2127 * any legacy client for stuff like HT ie's. 2128 */ 2129 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2130 legacy != IEEE80211_SEND_LEGACY_11B) { 2131 frm = ieee80211_add_htcap(frm, bss); 2132 frm = ieee80211_add_htinfo(frm, bss); 2133 } 2134 if (vap->iv_flags & IEEE80211_F_WPA1) { 2135 if (vap->iv_wpa_ie != NULL) 2136 frm = add_ie(frm, vap->iv_wpa_ie); 2137 /* XXX else complain? */ 2138 } 2139 if (vap->iv_flags & IEEE80211_F_WME) 2140 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2141 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2142 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2143 legacy != IEEE80211_SEND_LEGACY_11B) { 2144 frm = ieee80211_add_htcap_vendor(frm, bss); 2145 frm = ieee80211_add_htinfo_vendor(frm, bss); 2146 } 2147#ifdef IEEE80211_SUPPORT_SUPERG 2148 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2149 legacy != IEEE80211_SEND_LEGACY_11B) 2150 frm = ieee80211_add_athcaps(frm, bss); 2151#endif 2152 if (vap->iv_appie_proberesp != NULL) 2153 frm = add_appie(frm, vap->iv_appie_proberesp); 2154 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2155 2156 return m; 2157} 2158 2159/* 2160 * Send a probe response frame to the specified mac address. 2161 * This does not go through the normal mgt frame api so we 2162 * can specify the destination address and re-use the bss node 2163 * for the sta reference. 2164 */ 2165int 2166ieee80211_send_proberesp(struct ieee80211vap *vap, 2167 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2168{ 2169 struct ieee80211_node *bss = vap->iv_bss; 2170 struct ieee80211com *ic = vap->iv_ic; 2171 struct ieee80211_frame *wh; 2172 struct mbuf *m; 2173 2174 if (vap->iv_state == IEEE80211_S_CAC) { 2175 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2176 "block %s frame in CAC state", "probe response"); 2177 vap->iv_stats.is_tx_badstate++; 2178 return EIO; /* XXX */ 2179 } 2180 2181 /* 2182 * Hold a reference on the node so it doesn't go away until after 2183 * the xmit is complete all the way in the driver. On error we 2184 * will remove our reference. 2185 */ 2186 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2187 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2188 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2189 ieee80211_node_refcnt(bss)+1); 2190 ieee80211_ref_node(bss); 2191 2192 m = ieee80211_alloc_proberesp(bss, legacy); 2193 if (m == NULL) { 2194 ieee80211_free_node(bss); 2195 return ENOMEM; 2196 } 2197 2198 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2199 KASSERT(m != NULL, ("no room for header")); 2200 2201 wh = mtod(m, struct ieee80211_frame *); 2202 ieee80211_send_setup(bss, wh, 2203 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2204 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2205 /* XXX power management? */ 2206 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2207 2208 M_WME_SETAC(m, WME_AC_BE); 2209 2210 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2211 "send probe resp on channel %u to %s%s\n", 2212 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2213 legacy ? " <legacy>" : ""); 2214 IEEE80211_NODE_STAT(bss, tx_mgmt); 2215 2216 return ic->ic_raw_xmit(bss, m, NULL); 2217} 2218 2219/* 2220 * Allocate and build a RTS (Request To Send) control frame. 2221 */ 2222struct mbuf * 2223ieee80211_alloc_rts(struct ieee80211com *ic, 2224 const uint8_t ra[IEEE80211_ADDR_LEN], 2225 const uint8_t ta[IEEE80211_ADDR_LEN], 2226 uint16_t dur) 2227{ 2228 struct ieee80211_frame_rts *rts; 2229 struct mbuf *m; 2230 2231 /* XXX honor ic_headroom */ 2232 m = m_gethdr(M_DONTWAIT, MT_DATA); 2233 if (m != NULL) { 2234 rts = mtod(m, struct ieee80211_frame_rts *); 2235 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2236 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2237 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2238 *(u_int16_t *)rts->i_dur = htole16(dur); 2239 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2240 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2241 2242 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2243 } 2244 return m; 2245} 2246 2247/* 2248 * Allocate and build a CTS (Clear To Send) control frame. 2249 */ 2250struct mbuf * 2251ieee80211_alloc_cts(struct ieee80211com *ic, 2252 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2253{ 2254 struct ieee80211_frame_cts *cts; 2255 struct mbuf *m; 2256 2257 /* XXX honor ic_headroom */ 2258 m = m_gethdr(M_DONTWAIT, MT_DATA); 2259 if (m != NULL) { 2260 cts = mtod(m, struct ieee80211_frame_cts *); 2261 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2262 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2263 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2264 *(u_int16_t *)cts->i_dur = htole16(dur); 2265 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2266 2267 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2268 } 2269 return m; 2270} 2271 2272static void 2273ieee80211_tx_mgt_timeout(void *arg) 2274{ 2275 struct ieee80211_node *ni = arg; 2276 struct ieee80211vap *vap = ni->ni_vap; 2277 2278 if (vap->iv_state != IEEE80211_S_INIT && 2279 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2280 /* 2281 * NB: it's safe to specify a timeout as the reason here; 2282 * it'll only be used in the right state. 2283 */ 2284 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2285 IEEE80211_SCAN_FAIL_TIMEOUT); 2286 } 2287} 2288 2289static void 2290ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2291{ 2292 struct ieee80211vap *vap = ni->ni_vap; 2293 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2294 2295 /* 2296 * Frame transmit completed; arrange timer callback. If 2297 * transmit was successfuly we wait for response. Otherwise 2298 * we arrange an immediate callback instead of doing the 2299 * callback directly since we don't know what state the driver 2300 * is in (e.g. what locks it is holding). This work should 2301 * not be too time-critical and not happen too often so the 2302 * added overhead is acceptable. 2303 * 2304 * XXX what happens if !acked but response shows up before callback? 2305 */ 2306 if (vap->iv_state == ostate) 2307 callout_reset(&vap->iv_mgtsend, 2308 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2309 ieee80211_tx_mgt_timeout, ni); 2310} 2311 2312static void 2313ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2314 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2315{ 2316 struct ieee80211vap *vap = ni->ni_vap; 2317 struct ieee80211com *ic = ni->ni_ic; 2318 struct ieee80211_rateset *rs = &ni->ni_rates; 2319 uint16_t capinfo; 2320 2321 /* 2322 * beacon frame format 2323 * [8] time stamp 2324 * [2] beacon interval 2325 * [2] cabability information 2326 * [tlv] ssid 2327 * [tlv] supported rates 2328 * [3] parameter set (DS) 2329 * [8] CF parameter set (optional) 2330 * [tlv] parameter set (IBSS/TIM) 2331 * [tlv] country (optional) 2332 * [3] power control (optional) 2333 * [5] channel switch announcement (CSA) (optional) 2334 * [tlv] extended rate phy (ERP) 2335 * [tlv] extended supported rates 2336 * [tlv] RSN parameters 2337 * [tlv] HT capabilities 2338 * [tlv] HT information 2339 * XXX Vendor-specific OIDs (e.g. Atheros) 2340 * [tlv] WPA parameters 2341 * [tlv] WME parameters 2342 * [tlv] Vendor OUI HT capabilities (optional) 2343 * [tlv] Vendor OUI HT information (optional) 2344 * [tlv] Atheros capabilities (optional) 2345 * [tlv] TDMA parameters (optional) 2346 * [tlv] application data (optional) 2347 */ 2348 2349 memset(bo, 0, sizeof(*bo)); 2350 2351 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2352 frm += 8; 2353 *(uint16_t *)frm = htole16(ni->ni_intval); 2354 frm += 2; 2355 capinfo = getcapinfo(vap, ni->ni_chan); 2356 bo->bo_caps = (uint16_t *)frm; 2357 *(uint16_t *)frm = htole16(capinfo); 2358 frm += 2; 2359 *frm++ = IEEE80211_ELEMID_SSID; 2360 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2361 *frm++ = ni->ni_esslen; 2362 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2363 frm += ni->ni_esslen; 2364 } else 2365 *frm++ = 0; 2366 frm = ieee80211_add_rates(frm, rs); 2367 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2368 *frm++ = IEEE80211_ELEMID_DSPARMS; 2369 *frm++ = 1; 2370 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2371 } 2372 if (ic->ic_flags & IEEE80211_F_PCF) { 2373 bo->bo_cfp = frm; 2374 frm = ieee80211_add_cfparms(frm, ic); 2375 } 2376 bo->bo_tim = frm; 2377 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2378 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2379 *frm++ = 2; 2380 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2381 bo->bo_tim_len = 0; 2382 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2383 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2384 2385 tie->tim_ie = IEEE80211_ELEMID_TIM; 2386 tie->tim_len = 4; /* length */ 2387 tie->tim_count = 0; /* DTIM count */ 2388 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2389 tie->tim_bitctl = 0; /* bitmap control */ 2390 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2391 frm += sizeof(struct ieee80211_tim_ie); 2392 bo->bo_tim_len = 1; 2393 } 2394 bo->bo_tim_trailer = frm; 2395 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2396 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2397 frm = ieee80211_add_countryie(frm, ic); 2398 if (vap->iv_flags & IEEE80211_F_DOTH) { 2399 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2400 frm = ieee80211_add_powerconstraint(frm, vap); 2401 bo->bo_csa = frm; 2402 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2403 frm = ieee80211_add_csa(frm, vap); 2404 } else 2405 bo->bo_csa = frm; 2406 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2407 bo->bo_erp = frm; 2408 frm = ieee80211_add_erp(frm, ic); 2409 } 2410 frm = ieee80211_add_xrates(frm, rs); 2411 if (vap->iv_flags & IEEE80211_F_WPA2) { 2412 if (vap->iv_rsn_ie != NULL) 2413 frm = add_ie(frm, vap->iv_rsn_ie); 2414 /* XXX else complain */ 2415 } 2416 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2417 frm = ieee80211_add_htcap(frm, ni); 2418 bo->bo_htinfo = frm; 2419 frm = ieee80211_add_htinfo(frm, ni); 2420 } 2421 if (vap->iv_flags & IEEE80211_F_WPA1) { 2422 if (vap->iv_wpa_ie != NULL) 2423 frm = add_ie(frm, vap->iv_wpa_ie); 2424 /* XXX else complain */ 2425 } 2426 if (vap->iv_flags & IEEE80211_F_WME) { 2427 bo->bo_wme = frm; 2428 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2429 } 2430 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2431 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2432 frm = ieee80211_add_htcap_vendor(frm, ni); 2433 frm = ieee80211_add_htinfo_vendor(frm, ni); 2434 } 2435#ifdef IEEE80211_SUPPORT_SUPERG 2436 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2437 bo->bo_ath = frm; 2438 frm = ieee80211_add_athcaps(frm, ni); 2439 } 2440#endif 2441#ifdef IEEE80211_SUPPORT_TDMA 2442 if (vap->iv_caps & IEEE80211_C_TDMA) { 2443 bo->bo_tdma = frm; 2444 frm = ieee80211_add_tdma(frm, vap); 2445 } 2446#endif 2447 if (vap->iv_appie_beacon != NULL) { 2448 bo->bo_appie = frm; 2449 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2450 frm = add_appie(frm, vap->iv_appie_beacon); 2451 } 2452 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2453 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2454 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2455} 2456 2457/* 2458 * Allocate a beacon frame and fillin the appropriate bits. 2459 */ 2460struct mbuf * 2461ieee80211_beacon_alloc(struct ieee80211_node *ni, 2462 struct ieee80211_beacon_offsets *bo) 2463{ 2464 struct ieee80211vap *vap = ni->ni_vap; 2465 struct ieee80211com *ic = ni->ni_ic; 2466 struct ifnet *ifp = vap->iv_ifp; 2467 struct ieee80211_frame *wh; 2468 struct mbuf *m; 2469 int pktlen; 2470 uint8_t *frm; 2471 2472 /* 2473 * beacon frame format 2474 * [8] time stamp 2475 * [2] beacon interval 2476 * [2] cabability information 2477 * [tlv] ssid 2478 * [tlv] supported rates 2479 * [3] parameter set (DS) 2480 * [8] CF parameter set (optional) 2481 * [tlv] parameter set (IBSS/TIM) 2482 * [tlv] country (optional) 2483 * [3] power control (optional) 2484 * [5] channel switch announcement (CSA) (optional) 2485 * [tlv] extended rate phy (ERP) 2486 * [tlv] extended supported rates 2487 * [tlv] RSN parameters 2488 * [tlv] HT capabilities 2489 * [tlv] HT information 2490 * [tlv] Vendor OUI HT capabilities (optional) 2491 * [tlv] Vendor OUI HT information (optional) 2492 * XXX Vendor-specific OIDs (e.g. Atheros) 2493 * [tlv] WPA parameters 2494 * [tlv] WME parameters 2495 * [tlv] TDMA parameters (optional) 2496 * [tlv] application data (optional) 2497 * NB: we allocate the max space required for the TIM bitmap. 2498 * XXX how big is this? 2499 */ 2500 pktlen = 8 /* time stamp */ 2501 + sizeof(uint16_t) /* beacon interval */ 2502 + sizeof(uint16_t) /* capabilities */ 2503 + 2 + ni->ni_esslen /* ssid */ 2504 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2505 + 2 + 1 /* DS parameters */ 2506 + 2 + 6 /* CF parameters */ 2507 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2508 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2509 + 2 + 1 /* power control */ 2510 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2511 + 2 + 1 /* ERP */ 2512 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2513 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2514 2*sizeof(struct ieee80211_ie_wpa) : 0) 2515 /* XXX conditional? */ 2516 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2517 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2518 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2519 sizeof(struct ieee80211_wme_param) : 0) 2520#ifdef IEEE80211_SUPPORT_SUPERG 2521 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2522#endif 2523#ifdef IEEE80211_SUPPORT_TDMA 2524 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2525 sizeof(struct ieee80211_tdma_param) : 0) 2526#endif 2527 + IEEE80211_MAX_APPIE 2528 ; 2529 m = ieee80211_getmgtframe(&frm, 2530 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2531 if (m == NULL) { 2532 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2533 "%s: cannot get buf; size %u\n", __func__, pktlen); 2534 vap->iv_stats.is_tx_nobuf++; 2535 return NULL; 2536 } 2537 ieee80211_beacon_construct(m, frm, bo, ni); 2538 2539 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2540 KASSERT(m != NULL, ("no space for 802.11 header?")); 2541 wh = mtod(m, struct ieee80211_frame *); 2542 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2543 IEEE80211_FC0_SUBTYPE_BEACON; 2544 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2545 *(uint16_t *)wh->i_dur = 0; 2546 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2547 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2548 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2549 *(uint16_t *)wh->i_seq = 0; 2550 2551 return m; 2552} 2553 2554/* 2555 * Update the dynamic parts of a beacon frame based on the current state. 2556 */ 2557int 2558ieee80211_beacon_update(struct ieee80211_node *ni, 2559 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2560{ 2561 struct ieee80211vap *vap = ni->ni_vap; 2562 struct ieee80211com *ic = ni->ni_ic; 2563 int len_changed = 0; 2564 uint16_t capinfo; 2565 2566 IEEE80211_LOCK(ic); 2567 /* 2568 * Handle 11h channel change when we've reached the count. 2569 * We must recalculate the beacon frame contents to account 2570 * for the new channel. Note we do this only for the first 2571 * vap that reaches this point; subsequent vaps just update 2572 * their beacon state to reflect the recalculated channel. 2573 */ 2574 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2575 vap->iv_csa_count == ic->ic_csa_count) { 2576 vap->iv_csa_count = 0; 2577 /* 2578 * Effect channel change before reconstructing the beacon 2579 * frame contents as many places reference ni_chan. 2580 */ 2581 if (ic->ic_csa_newchan != NULL) 2582 ieee80211_csa_completeswitch(ic); 2583 /* 2584 * NB: ieee80211_beacon_construct clears all pending 2585 * updates in bo_flags so we don't need to explicitly 2586 * clear IEEE80211_BEACON_CSA. 2587 */ 2588 ieee80211_beacon_construct(m, 2589 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2590 2591 /* XXX do WME aggressive mode processing? */ 2592 IEEE80211_UNLOCK(ic); 2593 return 1; /* just assume length changed */ 2594 } 2595 2596 /* XXX faster to recalculate entirely or just changes? */ 2597 capinfo = getcapinfo(vap, ni->ni_chan); 2598 *bo->bo_caps = htole16(capinfo); 2599 2600 if (vap->iv_flags & IEEE80211_F_WME) { 2601 struct ieee80211_wme_state *wme = &ic->ic_wme; 2602 2603 /* 2604 * Check for agressive mode change. When there is 2605 * significant high priority traffic in the BSS 2606 * throttle back BE traffic by using conservative 2607 * parameters. Otherwise BE uses agressive params 2608 * to optimize performance of legacy/non-QoS traffic. 2609 */ 2610 if (wme->wme_flags & WME_F_AGGRMODE) { 2611 if (wme->wme_hipri_traffic > 2612 wme->wme_hipri_switch_thresh) { 2613 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2614 "%s: traffic %u, disable 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 = 2619 wme->wme_hipri_switch_hysteresis; 2620 } else 2621 wme->wme_hipri_traffic = 0; 2622 } else { 2623 if (wme->wme_hipri_traffic <= 2624 wme->wme_hipri_switch_thresh) { 2625 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2626 "%s: traffic %u, enable aggressive mode\n", 2627 __func__, wme->wme_hipri_traffic); 2628 wme->wme_flags |= WME_F_AGGRMODE; 2629 ieee80211_wme_updateparams_locked(vap); 2630 wme->wme_hipri_traffic = 0; 2631 } else 2632 wme->wme_hipri_traffic = 2633 wme->wme_hipri_switch_hysteresis; 2634 } 2635 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2636 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2637 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2638 } 2639 } 2640 2641 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2642 ieee80211_ht_update_beacon(vap, bo); 2643 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2644 } 2645#ifdef IEEE80211_SUPPORT_TDMA 2646 if (vap->iv_caps & IEEE80211_C_TDMA) { 2647 /* 2648 * NB: the beacon is potentially updated every TBTT. 2649 */ 2650 ieee80211_tdma_update_beacon(vap, bo); 2651 } 2652#endif 2653 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2654 struct ieee80211_tim_ie *tie = 2655 (struct ieee80211_tim_ie *) bo->bo_tim; 2656 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2657 u_int timlen, timoff, i; 2658 /* 2659 * ATIM/DTIM needs updating. If it fits in the 2660 * current space allocated then just copy in the 2661 * new bits. Otherwise we need to move any trailing 2662 * data to make room. Note that we know there is 2663 * contiguous space because ieee80211_beacon_allocate 2664 * insures there is space in the mbuf to write a 2665 * maximal-size virtual bitmap (based on iv_max_aid). 2666 */ 2667 /* 2668 * Calculate the bitmap size and offset, copy any 2669 * trailer out of the way, and then copy in the 2670 * new bitmap and update the information element. 2671 * Note that the tim bitmap must contain at least 2672 * one byte and any offset must be even. 2673 */ 2674 if (vap->iv_ps_pending != 0) { 2675 timoff = 128; /* impossibly large */ 2676 for (i = 0; i < vap->iv_tim_len; i++) 2677 if (vap->iv_tim_bitmap[i]) { 2678 timoff = i &~ 1; 2679 break; 2680 } 2681 KASSERT(timoff != 128, ("tim bitmap empty!")); 2682 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2683 if (vap->iv_tim_bitmap[i]) 2684 break; 2685 timlen = 1 + (i - timoff); 2686 } else { 2687 timoff = 0; 2688 timlen = 1; 2689 } 2690 if (timlen != bo->bo_tim_len) { 2691 /* copy up/down trailer */ 2692 int adjust = tie->tim_bitmap+timlen 2693 - bo->bo_tim_trailer; 2694 ovbcopy(bo->bo_tim_trailer, 2695 bo->bo_tim_trailer+adjust, 2696 bo->bo_tim_trailer_len); 2697 bo->bo_tim_trailer += adjust; 2698 bo->bo_erp += adjust; 2699 bo->bo_htinfo += adjust; 2700#ifdef IEEE80211_SUPERG_SUPPORT 2701 bo->bo_ath += adjust; 2702#endif 2703#ifdef IEEE80211_TDMA_SUPPORT 2704 bo->bo_tdma += adjust; 2705#endif 2706 bo->bo_appie += adjust; 2707 bo->bo_wme += adjust; 2708 bo->bo_csa += adjust; 2709 bo->bo_tim_len = timlen; 2710 2711 /* update information element */ 2712 tie->tim_len = 3 + timlen; 2713 tie->tim_bitctl = timoff; 2714 len_changed = 1; 2715 } 2716 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2717 bo->bo_tim_len); 2718 2719 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2720 2721 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2722 "%s: TIM updated, pending %u, off %u, len %u\n", 2723 __func__, vap->iv_ps_pending, timoff, timlen); 2724 } 2725 /* count down DTIM period */ 2726 if (tie->tim_count == 0) 2727 tie->tim_count = tie->tim_period - 1; 2728 else 2729 tie->tim_count--; 2730 /* update state for buffered multicast frames on DTIM */ 2731 if (mcast && tie->tim_count == 0) 2732 tie->tim_bitctl |= 1; 2733 else 2734 tie->tim_bitctl &= ~1; 2735 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2736 struct ieee80211_csa_ie *csa = 2737 (struct ieee80211_csa_ie *) bo->bo_csa; 2738 2739 /* 2740 * Insert or update CSA ie. If we're just starting 2741 * to count down to the channel switch then we need 2742 * to insert the CSA ie. Otherwise we just need to 2743 * drop the count. The actual change happens above 2744 * when the vap's count reaches the target count. 2745 */ 2746 if (vap->iv_csa_count == 0) { 2747 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2748 bo->bo_erp += sizeof(*csa); 2749 bo->bo_htinfo += sizeof(*csa); 2750 bo->bo_wme += sizeof(*csa); 2751#ifdef IEEE80211_SUPERG_SUPPORT 2752 bo->bo_ath += sizeof(*csa); 2753#endif 2754#ifdef IEEE80211_TDMA_SUPPORT 2755 bo->bo_tdma += sizeof(*csa); 2756#endif 2757 bo->bo_appie += sizeof(*csa); 2758 bo->bo_csa_trailer_len += sizeof(*csa); 2759 bo->bo_tim_trailer_len += sizeof(*csa); 2760 m->m_len += sizeof(*csa); 2761 m->m_pkthdr.len += sizeof(*csa); 2762 2763 ieee80211_add_csa(bo->bo_csa, vap); 2764 } else 2765 csa->csa_count--; 2766 vap->iv_csa_count++; 2767 /* NB: don't clear IEEE80211_BEACON_CSA */ 2768 } 2769 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2770 /* 2771 * ERP element needs updating. 2772 */ 2773 (void) ieee80211_add_erp(bo->bo_erp, ic); 2774 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2775 } 2776#ifdef IEEE80211_SUPPORT_SUPERG 2777 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2778 ieee80211_add_athcaps(bo->bo_ath, ni); 2779 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2780 } 2781#endif 2782 } 2783 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2784 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2785 int aielen; 2786 uint8_t *frm; 2787 2788 aielen = 0; 2789 if (aie != NULL) 2790 aielen += aie->ie_len; 2791 if (aielen != bo->bo_appie_len) { 2792 /* copy up/down trailer */ 2793 int adjust = aielen - bo->bo_appie_len; 2794 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2795 bo->bo_tim_trailer_len); 2796 bo->bo_tim_trailer += adjust; 2797 bo->bo_appie += adjust; 2798 bo->bo_appie_len = aielen; 2799 2800 len_changed = 1; 2801 } 2802 frm = bo->bo_appie; 2803 if (aie != NULL) 2804 frm = add_appie(frm, aie); 2805 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2806 } 2807 IEEE80211_UNLOCK(ic); 2808 2809 return len_changed; 2810} 2811