ieee80211_output.c revision 191544
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 191544 2009-04-26 21:34:53Z 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 mbuf *m, 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 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 435 ieee80211_seq seqno; 436 437 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 438 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 439 struct ieee80211vap *vap = ni->ni_vap; 440 441 switch (vap->iv_opmode) { 442 case IEEE80211_M_STA: 443 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 444 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 445 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 446 IEEE80211_ADDR_COPY(wh->i_addr3, da); 447 break; 448 case IEEE80211_M_IBSS: 449 case IEEE80211_M_AHDEMO: 450 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 451 IEEE80211_ADDR_COPY(wh->i_addr1, da); 452 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 453 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 454 break; 455 case IEEE80211_M_HOSTAP: 456 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 457 IEEE80211_ADDR_COPY(wh->i_addr1, da); 458 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 459 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 460 break; 461 case IEEE80211_M_WDS: 462 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 463 IEEE80211_ADDR_COPY(wh->i_addr1, da); 464 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 465 IEEE80211_ADDR_COPY(wh->i_addr3, da); 466 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 467 break; 468 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 469 break; 470 } 471 } else { 472 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 473 IEEE80211_ADDR_COPY(wh->i_addr1, da); 474 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 475 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 476 } 477 *(uint16_t *)&wh->i_dur[0] = 0; 478 479 seqno = ni->ni_txseqs[tid]++; 480 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 481 482 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 483 m->m_flags |= M_MCAST; 484#undef WH4 485} 486 487/* 488 * Send a management frame to the specified node. The node pointer 489 * must have a reference as the pointer will be passed to the driver 490 * and potentially held for a long time. If the frame is successfully 491 * dispatched to the driver, then it is responsible for freeing the 492 * reference (and potentially free'ing up any associated storage); 493 * otherwise deal with reclaiming any reference (on error). 494 */ 495int 496ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 497 struct ieee80211_bpf_params *params) 498{ 499 struct ieee80211vap *vap = ni->ni_vap; 500 struct ieee80211com *ic = ni->ni_ic; 501 struct ieee80211_frame *wh; 502 503 KASSERT(ni != NULL, ("null node")); 504 505 if (vap->iv_state == IEEE80211_S_CAC) { 506 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 507 ni, "block %s frame in CAC state", 508 ieee80211_mgt_subtype_name[ 509 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 510 IEEE80211_FC0_SUBTYPE_SHIFT]); 511 vap->iv_stats.is_tx_badstate++; 512 ieee80211_free_node(ni); 513 m_freem(m); 514 return EIO; /* XXX */ 515 } 516 517 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 518 if (m == NULL) { 519 ieee80211_free_node(ni); 520 return ENOMEM; 521 } 522 523 wh = mtod(m, struct ieee80211_frame *); 524 ieee80211_send_setup(ni, m, 525 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 526 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 527 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 528 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 529 "encrypting frame (%s)", __func__); 530 wh->i_fc[1] |= IEEE80211_FC1_WEP; 531 } 532 m->m_flags |= M_ENCAP; /* mark encapsulated */ 533 534 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 535 M_WME_SETAC(m, params->ibp_pri); 536 537#ifdef IEEE80211_DEBUG 538 /* avoid printing too many frames */ 539 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 540 ieee80211_msg_dumppkts(vap)) { 541 printf("[%s] send %s on channel %u\n", 542 ether_sprintf(wh->i_addr1), 543 ieee80211_mgt_subtype_name[ 544 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 545 IEEE80211_FC0_SUBTYPE_SHIFT], 546 ieee80211_chan2ieee(ic, ic->ic_curchan)); 547 } 548#endif 549 IEEE80211_NODE_STAT(ni, tx_mgmt); 550 551 return ic->ic_raw_xmit(ni, m, params); 552} 553 554/* 555 * Send a null data frame to the specified node. If the station 556 * is setup for QoS then a QoS Null Data frame is constructed. 557 * If this is a WDS station then a 4-address frame is constructed. 558 * 559 * NB: the caller is assumed to have setup a node reference 560 * for use; this is necessary to deal with a race condition 561 * when probing for inactive stations. Like ieee80211_mgmt_output 562 * we must cleanup any node reference on error; however we 563 * can safely just unref it as we know it will never be the 564 * last reference to the node. 565 */ 566int 567ieee80211_send_nulldata(struct ieee80211_node *ni) 568{ 569 struct ieee80211vap *vap = ni->ni_vap; 570 struct ieee80211com *ic = ni->ni_ic; 571 struct mbuf *m; 572 struct ieee80211_frame *wh; 573 int hdrlen; 574 uint8_t *frm; 575 576 if (vap->iv_state == IEEE80211_S_CAC) { 577 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 578 ni, "block %s frame in CAC state", "null data"); 579 ieee80211_unref_node(&ni); 580 vap->iv_stats.is_tx_badstate++; 581 return EIO; /* XXX */ 582 } 583 584 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 585 hdrlen = sizeof(struct ieee80211_qosframe); 586 else 587 hdrlen = sizeof(struct ieee80211_frame); 588 /* NB: only WDS vap's get 4-address frames */ 589 if (vap->iv_opmode == IEEE80211_M_WDS) 590 hdrlen += IEEE80211_ADDR_LEN; 591 if (ic->ic_flags & IEEE80211_F_DATAPAD) 592 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 593 594 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 595 if (m == NULL) { 596 /* XXX debug msg */ 597 ieee80211_unref_node(&ni); 598 vap->iv_stats.is_tx_nobuf++; 599 return ENOMEM; 600 } 601 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 602 ("leading space %zd", M_LEADINGSPACE(m))); 603 M_PREPEND(m, hdrlen, M_DONTWAIT); 604 if (m == NULL) { 605 /* NB: cannot happen */ 606 ieee80211_free_node(ni); 607 return ENOMEM; 608 } 609 610 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 611 if (ni->ni_flags & IEEE80211_NODE_QOS) { 612 const int tid = WME_AC_TO_TID(WME_AC_BE); 613 uint8_t *qos; 614 615 ieee80211_send_setup(ni, m, 616 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 617 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 618 619 if (vap->iv_opmode == IEEE80211_M_WDS) 620 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 621 else 622 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 623 qos[0] = tid & IEEE80211_QOS_TID; 624 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 625 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 626 qos[1] = 0; 627 } else { 628 ieee80211_send_setup(ni, m, 629 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 630 IEEE80211_NONQOS_TID, 631 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 632 } 633 if (vap->iv_opmode != IEEE80211_M_WDS) { 634 /* NB: power management bit is never sent by an AP */ 635 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 636 vap->iv_opmode != IEEE80211_M_HOSTAP) 637 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 638 } 639 m->m_len = m->m_pkthdr.len = hdrlen; 640 m->m_flags |= M_ENCAP; /* mark encapsulated */ 641 642 M_WME_SETAC(m, WME_AC_BE); 643 644 IEEE80211_NODE_STAT(ni, tx_data); 645 646 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 647 "send %snull data frame on channel %u, pwr mgt %s", 648 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 649 ieee80211_chan2ieee(ic, ic->ic_curchan), 650 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 651 652 return ic->ic_raw_xmit(ni, m, NULL); 653} 654 655/* 656 * Assign priority to a frame based on any vlan tag assigned 657 * to the station and/or any Diffserv setting in an IP header. 658 * Finally, if an ACM policy is setup (in station mode) it's 659 * applied. 660 */ 661int 662ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 663{ 664 const struct ether_header *eh = mtod(m, struct ether_header *); 665 int v_wme_ac, d_wme_ac, ac; 666 667 /* 668 * Always promote PAE/EAPOL frames to high priority. 669 */ 670 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 671 /* NB: mark so others don't need to check header */ 672 m->m_flags |= M_EAPOL; 673 ac = WME_AC_VO; 674 goto done; 675 } 676 /* 677 * Non-qos traffic goes to BE. 678 */ 679 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 680 ac = WME_AC_BE; 681 goto done; 682 } 683 684 /* 685 * If node has a vlan tag then all traffic 686 * to it must have a matching tag. 687 */ 688 v_wme_ac = 0; 689 if (ni->ni_vlan != 0) { 690 if ((m->m_flags & M_VLANTAG) == 0) { 691 IEEE80211_NODE_STAT(ni, tx_novlantag); 692 return 1; 693 } 694 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 695 EVL_VLANOFTAG(ni->ni_vlan)) { 696 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 697 return 1; 698 } 699 /* map vlan priority to AC */ 700 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 701 } 702 703#ifdef INET 704 if (eh->ether_type == htons(ETHERTYPE_IP)) { 705 uint8_t tos; 706 /* 707 * IP frame, map the DSCP bits from the TOS field. 708 */ 709 /* XXX m_copydata may be too slow for fast path */ 710 /* NB: ip header may not be in first mbuf */ 711 m_copydata(m, sizeof(struct ether_header) + 712 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 713 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 714 d_wme_ac = TID_TO_WME_AC(tos); 715 } else { 716#endif /* INET */ 717 d_wme_ac = WME_AC_BE; 718#ifdef INET 719 } 720#endif 721 /* 722 * Use highest priority AC. 723 */ 724 if (v_wme_ac > d_wme_ac) 725 ac = v_wme_ac; 726 else 727 ac = d_wme_ac; 728 729 /* 730 * Apply ACM policy. 731 */ 732 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 733 static const int acmap[4] = { 734 WME_AC_BK, /* WME_AC_BE */ 735 WME_AC_BK, /* WME_AC_BK */ 736 WME_AC_BE, /* WME_AC_VI */ 737 WME_AC_VI, /* WME_AC_VO */ 738 }; 739 struct ieee80211com *ic = ni->ni_ic; 740 741 while (ac != WME_AC_BK && 742 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 743 ac = acmap[ac]; 744 } 745done: 746 M_WME_SETAC(m, ac); 747 return 0; 748} 749 750/* 751 * Insure there is sufficient contiguous space to encapsulate the 752 * 802.11 data frame. If room isn't already there, arrange for it. 753 * Drivers and cipher modules assume we have done the necessary work 754 * and fail rudely if they don't find the space they need. 755 */ 756struct mbuf * 757ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 758 struct ieee80211_key *key, struct mbuf *m) 759{ 760#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 761 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 762 763 if (key != NULL) { 764 /* XXX belongs in crypto code? */ 765 needed_space += key->wk_cipher->ic_header; 766 /* XXX frags */ 767 /* 768 * When crypto is being done in the host we must insure 769 * the data are writable for the cipher routines; clone 770 * a writable mbuf chain. 771 * XXX handle SWMIC specially 772 */ 773 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 774 m = m_unshare(m, M_NOWAIT); 775 if (m == NULL) { 776 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 777 "%s: cannot get writable mbuf\n", __func__); 778 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 779 return NULL; 780 } 781 } 782 } 783 /* 784 * We know we are called just before stripping an Ethernet 785 * header and prepending an LLC header. This means we know 786 * there will be 787 * sizeof(struct ether_header) - sizeof(struct llc) 788 * bytes recovered to which we need additional space for the 789 * 802.11 header and any crypto header. 790 */ 791 /* XXX check trailing space and copy instead? */ 792 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 793 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 794 if (n == NULL) { 795 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 796 "%s: cannot expand storage\n", __func__); 797 vap->iv_stats.is_tx_nobuf++; 798 m_freem(m); 799 return NULL; 800 } 801 KASSERT(needed_space <= MHLEN, 802 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 803 /* 804 * Setup new mbuf to have leading space to prepend the 805 * 802.11 header and any crypto header bits that are 806 * required (the latter are added when the driver calls 807 * back to ieee80211_crypto_encap to do crypto encapsulation). 808 */ 809 /* NB: must be first 'cuz it clobbers m_data */ 810 m_move_pkthdr(n, m); 811 n->m_len = 0; /* NB: m_gethdr does not set */ 812 n->m_data += needed_space; 813 /* 814 * Pull up Ethernet header to create the expected layout. 815 * We could use m_pullup but that's overkill (i.e. we don't 816 * need the actual data) and it cannot fail so do it inline 817 * for speed. 818 */ 819 /* NB: struct ether_header is known to be contiguous */ 820 n->m_len += sizeof(struct ether_header); 821 m->m_len -= sizeof(struct ether_header); 822 m->m_data += sizeof(struct ether_header); 823 /* 824 * Replace the head of the chain. 825 */ 826 n->m_next = m; 827 m = n; 828 } 829 return m; 830#undef TO_BE_RECLAIMED 831} 832 833/* 834 * Return the transmit key to use in sending a unicast frame. 835 * If a unicast key is set we use that. When no unicast key is set 836 * we fall back to the default transmit key. 837 */ 838static __inline struct ieee80211_key * 839ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 840 struct ieee80211_node *ni) 841{ 842 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 843 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 844 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 845 return NULL; 846 return &vap->iv_nw_keys[vap->iv_def_txkey]; 847 } else { 848 return &ni->ni_ucastkey; 849 } 850} 851 852/* 853 * Return the transmit key to use in sending a multicast frame. 854 * Multicast traffic always uses the group key which is installed as 855 * the default tx key. 856 */ 857static __inline struct ieee80211_key * 858ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 859 struct ieee80211_node *ni) 860{ 861 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 862 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 863 return NULL; 864 return &vap->iv_nw_keys[vap->iv_def_txkey]; 865} 866 867/* 868 * Encapsulate an outbound data frame. The mbuf chain is updated. 869 * If an error is encountered NULL is returned. The caller is required 870 * to provide a node reference and pullup the ethernet header in the 871 * first mbuf. 872 * 873 * NB: Packet is assumed to be processed by ieee80211_classify which 874 * marked EAPOL frames w/ M_EAPOL. 875 */ 876struct mbuf * 877ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 878 struct mbuf *m) 879{ 880#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 881 struct ieee80211com *ic = ni->ni_ic; 882 struct ether_header eh; 883 struct ieee80211_frame *wh; 884 struct ieee80211_key *key; 885 struct llc *llc; 886 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 887 ieee80211_seq seqno; 888 889 /* 890 * Copy existing Ethernet header to a safe place. The 891 * rest of the code assumes it's ok to strip it when 892 * reorganizing state for the final encapsulation. 893 */ 894 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 895 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 896 897 /* 898 * Insure space for additional headers. First identify 899 * transmit key to use in calculating any buffer adjustments 900 * required. This is also used below to do privacy 901 * encapsulation work. Then calculate the 802.11 header 902 * size and any padding required by the driver. 903 * 904 * Note key may be NULL if we fall back to the default 905 * transmit key and that is not set. In that case the 906 * buffer may not be expanded as needed by the cipher 907 * routines, but they will/should discard it. 908 */ 909 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 910 if (vap->iv_opmode == IEEE80211_M_STA || 911 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 912 (vap->iv_opmode == IEEE80211_M_WDS && 913 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 914 key = ieee80211_crypto_getucastkey(vap, ni); 915 else 916 key = ieee80211_crypto_getmcastkey(vap, ni); 917 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 918 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 919 eh.ether_dhost, 920 "no default transmit key (%s) deftxkey %u", 921 __func__, vap->iv_def_txkey); 922 vap->iv_stats.is_tx_nodefkey++; 923 goto bad; 924 } 925 } else 926 key = NULL; 927 /* 928 * XXX Some ap's don't handle QoS-encapsulated EAPOL 929 * frames so suppress use. This may be an issue if other 930 * ap's require all data frames to be QoS-encapsulated 931 * once negotiated in which case we'll need to make this 932 * configurable. 933 */ 934 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 935 (m->m_flags & M_EAPOL) == 0; 936 if (addqos) 937 hdrsize = sizeof(struct ieee80211_qosframe); 938 else 939 hdrsize = sizeof(struct ieee80211_frame); 940 /* 941 * 4-address frames need to be generated for: 942 * o packets sent through a WDS vap (IEEE80211_M_WDS) 943 * o packets relayed by a station operating with dynamic WDS 944 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 945 */ 946 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 947 (vap->iv_opmode == IEEE80211_M_STA && 948 (vap->iv_flags & IEEE80211_F_DWDS) && 949 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 950 if (is4addr) 951 hdrsize += IEEE80211_ADDR_LEN; 952 /* 953 * Honor driver DATAPAD requirement. 954 */ 955 if (ic->ic_flags & IEEE80211_F_DATAPAD) 956 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 957 else 958 hdrspace = hdrsize; 959 960 if (__predict_true((m->m_flags & M_FF) == 0)) { 961 /* 962 * Normal frame. 963 */ 964 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 965 if (m == NULL) { 966 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 967 goto bad; 968 } 969 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 970 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 971 llc = mtod(m, struct llc *); 972 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 973 llc->llc_control = LLC_UI; 974 llc->llc_snap.org_code[0] = 0; 975 llc->llc_snap.org_code[1] = 0; 976 llc->llc_snap.org_code[2] = 0; 977 llc->llc_snap.ether_type = eh.ether_type; 978 } else { 979#ifdef IEEE80211_SUPPORT_SUPERG 980 /* 981 * Aggregated frame. 982 */ 983 m = ieee80211_ff_encap(vap, m, hdrspace, key); 984 if (m == NULL) 985#endif 986 goto bad; 987 } 988 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 989 990 M_PREPEND(m, hdrspace, M_DONTWAIT); 991 if (m == NULL) { 992 vap->iv_stats.is_tx_nobuf++; 993 goto bad; 994 } 995 wh = mtod(m, struct ieee80211_frame *); 996 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 997 *(uint16_t *)wh->i_dur = 0; 998 if (is4addr) { 999 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1000 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1001 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1002 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1003 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1004 } else switch (vap->iv_opmode) { 1005 case IEEE80211_M_STA: 1006 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1007 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1008 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1009 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1010 break; 1011 case IEEE80211_M_IBSS: 1012 case IEEE80211_M_AHDEMO: 1013 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1014 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1015 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1016 /* 1017 * NB: always use the bssid from iv_bss as the 1018 * neighbor's may be stale after an ibss merge 1019 */ 1020 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1021 break; 1022 case IEEE80211_M_HOSTAP: 1023 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1024 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1025 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1026 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1027 break; 1028 case IEEE80211_M_MONITOR: 1029 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1030 goto bad; 1031 } 1032 if (m->m_flags & M_MORE_DATA) 1033 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1034 if (addqos) { 1035 uint8_t *qos; 1036 int ac, tid; 1037 1038 if (is4addr) { 1039 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1040 } else 1041 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1042 ac = M_WME_GETAC(m); 1043 /* map from access class/queue to 11e header priorty value */ 1044 tid = WME_AC_TO_TID(ac); 1045 qos[0] = tid & IEEE80211_QOS_TID; 1046 /* 1047 * Check if A-MPDU tx aggregation is setup or if we 1048 * should try to enable it. The sta must be associated 1049 * with HT and A-MPDU enabled for use. When the policy 1050 * routine decides we should enable A-MPDU we issue an 1051 * ADDBA request and wait for a reply. The frame being 1052 * encapsulated will go out w/o using A-MPDU, or possibly 1053 * it might be collected by the driver and held/retransmit. 1054 * The default ic_ampdu_enable routine handles staggering 1055 * ADDBA requests in case the receiver NAK's us or we are 1056 * otherwise unable to establish a BA stream. 1057 */ 1058 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1059 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1060 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1061 1062 ieee80211_txampdu_count_packet(tap); 1063 if (IEEE80211_AMPDU_RUNNING(tap)) { 1064 /* 1065 * Operational, mark frame for aggregation. 1066 * 1067 * NB: We support only immediate BA's for 1068 * AMPDU which means we set the QoS control 1069 * field to "normal ack" (0) to get "implicit 1070 * block ack" behaviour. 1071 */ 1072 m->m_flags |= M_AMPDU_MPDU; 1073 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1074 ic->ic_ampdu_enable(ni, tap)) { 1075 /* 1076 * Not negotiated yet, request service. 1077 */ 1078 ieee80211_ampdu_request(ni, tap); 1079 } 1080 } 1081 /* XXX works even when BA marked above */ 1082 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1083 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1084 qos[1] = 0; 1085 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1086 1087 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1088 /* 1089 * NB: don't assign a sequence # to potential 1090 * aggregates; we expect this happens at the 1091 * point the frame comes off any aggregation q 1092 * as otherwise we may introduce holes in the 1093 * BA sequence space and/or make window accouting 1094 * more difficult. 1095 * 1096 * XXX may want to control this with a driver 1097 * capability; this may also change when we pull 1098 * aggregation up into net80211 1099 */ 1100 seqno = ni->ni_txseqs[tid]++; 1101 *(uint16_t *)wh->i_seq = 1102 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1103 } 1104 } else { 1105 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1106 *(uint16_t *)wh->i_seq = 1107 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1108 } 1109 /* check if xmit fragmentation is required */ 1110 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1111 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1112 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1113 (m->m_flags & M_FF) == 0); /* NB: don't fragment ff's */ 1114 if (key != NULL) { 1115 /* 1116 * IEEE 802.1X: send EAPOL frames always in the clear. 1117 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1118 */ 1119 if ((m->m_flags & M_EAPOL) == 0 || 1120 ((vap->iv_flags & IEEE80211_F_WPA) && 1121 (vap->iv_opmode == IEEE80211_M_STA ? 1122 !IEEE80211_KEY_UNDEFINED(key) : 1123 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1124 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1125 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1126 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1127 eh.ether_dhost, 1128 "%s", "enmic failed, discard frame"); 1129 vap->iv_stats.is_crypto_enmicfail++; 1130 goto bad; 1131 } 1132 } 1133 } 1134 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1135 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1136 goto bad; 1137 1138 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1139 1140 IEEE80211_NODE_STAT(ni, tx_data); 1141 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1142 IEEE80211_NODE_STAT(ni, tx_mcast); 1143 m->m_flags |= M_MCAST; 1144 } else 1145 IEEE80211_NODE_STAT(ni, tx_ucast); 1146 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1147 1148 return m; 1149bad: 1150 if (m != NULL) 1151 m_freem(m); 1152 return NULL; 1153#undef WH4 1154} 1155 1156/* 1157 * Fragment the frame according to the specified mtu. 1158 * The size of the 802.11 header (w/o padding) is provided 1159 * so we don't need to recalculate it. We create a new 1160 * mbuf for each fragment and chain it through m_nextpkt; 1161 * we might be able to optimize this by reusing the original 1162 * packet's mbufs but that is significantly more complicated. 1163 */ 1164static int 1165ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1166 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1167{ 1168 struct ieee80211_frame *wh, *whf; 1169 struct mbuf *m, *prev, *next; 1170 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1171 1172 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1173 KASSERT(m0->m_pkthdr.len > mtu, 1174 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1175 1176 wh = mtod(m0, struct ieee80211_frame *); 1177 /* NB: mark the first frag; it will be propagated below */ 1178 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1179 totalhdrsize = hdrsize + ciphdrsize; 1180 fragno = 1; 1181 off = mtu - ciphdrsize; 1182 remainder = m0->m_pkthdr.len - off; 1183 prev = m0; 1184 do { 1185 fragsize = totalhdrsize + remainder; 1186 if (fragsize > mtu) 1187 fragsize = mtu; 1188 /* XXX fragsize can be >2048! */ 1189 KASSERT(fragsize < MCLBYTES, 1190 ("fragment size %u too big!", fragsize)); 1191 if (fragsize > MHLEN) 1192 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1193 else 1194 m = m_gethdr(M_DONTWAIT, MT_DATA); 1195 if (m == NULL) 1196 goto bad; 1197 /* leave room to prepend any cipher header */ 1198 m_align(m, fragsize - ciphdrsize); 1199 1200 /* 1201 * Form the header in the fragment. Note that since 1202 * we mark the first fragment with the MORE_FRAG bit 1203 * it automatically is propagated to each fragment; we 1204 * need only clear it on the last fragment (done below). 1205 */ 1206 whf = mtod(m, struct ieee80211_frame *); 1207 memcpy(whf, wh, hdrsize); 1208 *(uint16_t *)&whf->i_seq[0] |= htole16( 1209 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1210 IEEE80211_SEQ_FRAG_SHIFT); 1211 fragno++; 1212 1213 payload = fragsize - totalhdrsize; 1214 /* NB: destination is known to be contiguous */ 1215 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1216 m->m_len = hdrsize + payload; 1217 m->m_pkthdr.len = hdrsize + payload; 1218 m->m_flags |= M_FRAG; 1219 1220 /* chain up the fragment */ 1221 prev->m_nextpkt = m; 1222 prev = m; 1223 1224 /* deduct fragment just formed */ 1225 remainder -= payload; 1226 off += payload; 1227 } while (remainder != 0); 1228 1229 /* set the last fragment */ 1230 m->m_flags |= M_LASTFRAG; 1231 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1232 1233 /* strip first mbuf now that everything has been copied */ 1234 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1235 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1236 1237 vap->iv_stats.is_tx_fragframes++; 1238 vap->iv_stats.is_tx_frags += fragno-1; 1239 1240 return 1; 1241bad: 1242 /* reclaim fragments but leave original frame for caller to free */ 1243 for (m = m0->m_nextpkt; m != NULL; m = next) { 1244 next = m->m_nextpkt; 1245 m->m_nextpkt = NULL; /* XXX paranoid */ 1246 m_freem(m); 1247 } 1248 m0->m_nextpkt = NULL; 1249 return 0; 1250} 1251 1252/* 1253 * Add a supported rates element id to a frame. 1254 */ 1255static uint8_t * 1256ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1257{ 1258 int nrates; 1259 1260 *frm++ = IEEE80211_ELEMID_RATES; 1261 nrates = rs->rs_nrates; 1262 if (nrates > IEEE80211_RATE_SIZE) 1263 nrates = IEEE80211_RATE_SIZE; 1264 *frm++ = nrates; 1265 memcpy(frm, rs->rs_rates, nrates); 1266 return frm + nrates; 1267} 1268 1269/* 1270 * Add an extended supported rates element id to a frame. 1271 */ 1272static uint8_t * 1273ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1274{ 1275 /* 1276 * Add an extended supported rates element if operating in 11g mode. 1277 */ 1278 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1279 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1280 *frm++ = IEEE80211_ELEMID_XRATES; 1281 *frm++ = nrates; 1282 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1283 frm += nrates; 1284 } 1285 return frm; 1286} 1287 1288/* 1289 * Add an ssid element to a frame. 1290 */ 1291static uint8_t * 1292ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1293{ 1294 *frm++ = IEEE80211_ELEMID_SSID; 1295 *frm++ = len; 1296 memcpy(frm, ssid, len); 1297 return frm + len; 1298} 1299 1300/* 1301 * Add an erp element to a frame. 1302 */ 1303static uint8_t * 1304ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1305{ 1306 uint8_t erp; 1307 1308 *frm++ = IEEE80211_ELEMID_ERP; 1309 *frm++ = 1; 1310 erp = 0; 1311 if (ic->ic_nonerpsta != 0) 1312 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1313 if (ic->ic_flags & IEEE80211_F_USEPROT) 1314 erp |= IEEE80211_ERP_USE_PROTECTION; 1315 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1316 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1317 *frm++ = erp; 1318 return frm; 1319} 1320 1321/* 1322 * Add a CFParams element to a frame. 1323 */ 1324static uint8_t * 1325ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1326{ 1327#define ADDSHORT(frm, v) do { \ 1328 frm[0] = (v) & 0xff; \ 1329 frm[1] = (v) >> 8; \ 1330 frm += 2; \ 1331} while (0) 1332 *frm++ = IEEE80211_ELEMID_CFPARMS; 1333 *frm++ = 6; 1334 *frm++ = 0; /* CFP count */ 1335 *frm++ = 2; /* CFP period */ 1336 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1337 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1338 return frm; 1339#undef ADDSHORT 1340} 1341 1342static __inline uint8_t * 1343add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1344{ 1345 memcpy(frm, ie->ie_data, ie->ie_len); 1346 return frm + ie->ie_len; 1347} 1348 1349static __inline uint8_t * 1350add_ie(uint8_t *frm, const uint8_t *ie) 1351{ 1352 memcpy(frm, ie, 2 + ie[1]); 1353 return frm + 2 + ie[1]; 1354} 1355 1356#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1357/* 1358 * Add a WME information element to a frame. 1359 */ 1360static uint8_t * 1361ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1362{ 1363 static const struct ieee80211_wme_info info = { 1364 .wme_id = IEEE80211_ELEMID_VENDOR, 1365 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1366 .wme_oui = { WME_OUI_BYTES }, 1367 .wme_type = WME_OUI_TYPE, 1368 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1369 .wme_version = WME_VERSION, 1370 .wme_info = 0, 1371 }; 1372 memcpy(frm, &info, sizeof(info)); 1373 return frm + sizeof(info); 1374} 1375 1376/* 1377 * Add a WME parameters element to a frame. 1378 */ 1379static uint8_t * 1380ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1381{ 1382#define SM(_v, _f) (((_v) << _f##_S) & _f) 1383#define ADDSHORT(frm, v) do { \ 1384 frm[0] = (v) & 0xff; \ 1385 frm[1] = (v) >> 8; \ 1386 frm += 2; \ 1387} while (0) 1388 /* NB: this works 'cuz a param has an info at the front */ 1389 static const struct ieee80211_wme_info param = { 1390 .wme_id = IEEE80211_ELEMID_VENDOR, 1391 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1392 .wme_oui = { WME_OUI_BYTES }, 1393 .wme_type = WME_OUI_TYPE, 1394 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1395 .wme_version = WME_VERSION, 1396 }; 1397 int i; 1398 1399 memcpy(frm, ¶m, sizeof(param)); 1400 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1401 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1402 *frm++ = 0; /* reserved field */ 1403 for (i = 0; i < WME_NUM_AC; i++) { 1404 const struct wmeParams *ac = 1405 &wme->wme_bssChanParams.cap_wmeParams[i]; 1406 *frm++ = SM(i, WME_PARAM_ACI) 1407 | SM(ac->wmep_acm, WME_PARAM_ACM) 1408 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1409 ; 1410 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1411 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1412 ; 1413 ADDSHORT(frm, ac->wmep_txopLimit); 1414 } 1415 return frm; 1416#undef SM 1417#undef ADDSHORT 1418} 1419#undef WME_OUI_BYTES 1420 1421/* 1422 * Add an 11h Power Constraint element to a frame. 1423 */ 1424static uint8_t * 1425ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1426{ 1427 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1428 /* XXX per-vap tx power limit? */ 1429 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1430 1431 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1432 frm[1] = 1; 1433 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1434 return frm + 3; 1435} 1436 1437/* 1438 * Add an 11h Power Capability element to a frame. 1439 */ 1440static uint8_t * 1441ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1442{ 1443 frm[0] = IEEE80211_ELEMID_PWRCAP; 1444 frm[1] = 2; 1445 frm[2] = c->ic_minpower; 1446 frm[3] = c->ic_maxpower; 1447 return frm + 4; 1448} 1449 1450/* 1451 * Add an 11h Supported Channels element to a frame. 1452 */ 1453static uint8_t * 1454ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1455{ 1456 static const int ielen = 26; 1457 1458 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1459 frm[1] = ielen; 1460 /* XXX not correct */ 1461 memcpy(frm+2, ic->ic_chan_avail, ielen); 1462 return frm + 2 + ielen; 1463} 1464 1465/* 1466 * Add an 11h Channel Switch Announcement element to a frame. 1467 * Note that we use the per-vap CSA count to adjust the global 1468 * counter so we can use this routine to form probe response 1469 * frames and get the current count. 1470 */ 1471static uint8_t * 1472ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1473{ 1474 struct ieee80211com *ic = vap->iv_ic; 1475 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1476 1477 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1478 csa->csa_len = 3; 1479 csa->csa_mode = 1; /* XXX force quiet on channel */ 1480 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1481 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1482 return frm + sizeof(*csa); 1483} 1484 1485/* 1486 * Add an 11h country information element to a frame. 1487 */ 1488static uint8_t * 1489ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1490{ 1491 1492 if (ic->ic_countryie == NULL || 1493 ic->ic_countryie_chan != ic->ic_bsschan) { 1494 /* 1495 * Handle lazy construction of ie. This is done on 1496 * first use and after a channel change that requires 1497 * re-calculation. 1498 */ 1499 if (ic->ic_countryie != NULL) 1500 free(ic->ic_countryie, M_80211_NODE_IE); 1501 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1502 if (ic->ic_countryie == NULL) 1503 return frm; 1504 ic->ic_countryie_chan = ic->ic_bsschan; 1505 } 1506 return add_appie(frm, ic->ic_countryie); 1507} 1508 1509/* 1510 * Send a probe request frame with the specified ssid 1511 * and any optional information element data. 1512 */ 1513int 1514ieee80211_send_probereq(struct ieee80211_node *ni, 1515 const uint8_t sa[IEEE80211_ADDR_LEN], 1516 const uint8_t da[IEEE80211_ADDR_LEN], 1517 const uint8_t bssid[IEEE80211_ADDR_LEN], 1518 const uint8_t *ssid, size_t ssidlen) 1519{ 1520 struct ieee80211vap *vap = ni->ni_vap; 1521 struct ieee80211com *ic = ni->ni_ic; 1522 const struct ieee80211_txparam *tp; 1523 struct ieee80211_bpf_params params; 1524 struct ieee80211_frame *wh; 1525 const struct ieee80211_rateset *rs; 1526 struct mbuf *m; 1527 uint8_t *frm; 1528 1529 if (vap->iv_state == IEEE80211_S_CAC) { 1530 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1531 "block %s frame in CAC state", "probe request"); 1532 vap->iv_stats.is_tx_badstate++; 1533 return EIO; /* XXX */ 1534 } 1535 1536 /* 1537 * Hold a reference on the node so it doesn't go away until after 1538 * the xmit is complete all the way in the driver. On error we 1539 * will remove our reference. 1540 */ 1541 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1542 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1543 __func__, __LINE__, 1544 ni, ether_sprintf(ni->ni_macaddr), 1545 ieee80211_node_refcnt(ni)+1); 1546 ieee80211_ref_node(ni); 1547 1548 /* 1549 * prreq frame format 1550 * [tlv] ssid 1551 * [tlv] supported rates 1552 * [tlv] RSN (optional) 1553 * [tlv] extended supported rates 1554 * [tlv] WPA (optional) 1555 * [tlv] user-specified ie's 1556 */ 1557 m = ieee80211_getmgtframe(&frm, 1558 ic->ic_headroom + sizeof(struct ieee80211_frame), 1559 2 + IEEE80211_NWID_LEN 1560 + 2 + IEEE80211_RATE_SIZE 1561 + sizeof(struct ieee80211_ie_wpa) 1562 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1563 + sizeof(struct ieee80211_ie_wpa) 1564 + (vap->iv_appie_probereq != NULL ? 1565 vap->iv_appie_probereq->ie_len : 0) 1566 ); 1567 if (m == NULL) { 1568 vap->iv_stats.is_tx_nobuf++; 1569 ieee80211_free_node(ni); 1570 return ENOMEM; 1571 } 1572 1573 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1574 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1575 frm = ieee80211_add_rates(frm, rs); 1576 if (vap->iv_flags & IEEE80211_F_WPA2) { 1577 if (vap->iv_rsn_ie != NULL) 1578 frm = add_ie(frm, vap->iv_rsn_ie); 1579 /* XXX else complain? */ 1580 } 1581 frm = ieee80211_add_xrates(frm, rs); 1582 if (vap->iv_flags & IEEE80211_F_WPA1) { 1583 if (vap->iv_wpa_ie != NULL) 1584 frm = add_ie(frm, vap->iv_wpa_ie); 1585 /* XXX else complain? */ 1586 } 1587 if (vap->iv_appie_probereq != NULL) 1588 frm = add_appie(frm, vap->iv_appie_probereq); 1589 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1590 1591 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1592 ("leading space %zd", M_LEADINGSPACE(m))); 1593 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1594 if (m == NULL) { 1595 /* NB: cannot happen */ 1596 ieee80211_free_node(ni); 1597 return ENOMEM; 1598 } 1599 1600 wh = mtod(m, struct ieee80211_frame *); 1601 ieee80211_send_setup(ni, m, 1602 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1603 IEEE80211_NONQOS_TID, sa, da, bssid); 1604 /* XXX power management? */ 1605 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1606 1607 M_WME_SETAC(m, WME_AC_BE); 1608 1609 IEEE80211_NODE_STAT(ni, tx_probereq); 1610 IEEE80211_NODE_STAT(ni, tx_mgmt); 1611 1612 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1613 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1614 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1615 ssidlen, ssid); 1616 1617 memset(¶ms, 0, sizeof(params)); 1618 params.ibp_pri = M_WME_GETAC(m); 1619 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1620 params.ibp_rate0 = tp->mgmtrate; 1621 if (IEEE80211_IS_MULTICAST(da)) { 1622 params.ibp_flags |= IEEE80211_BPF_NOACK; 1623 params.ibp_try0 = 1; 1624 } else 1625 params.ibp_try0 = tp->maxretry; 1626 params.ibp_power = ni->ni_txpower; 1627 return ic->ic_raw_xmit(ni, m, ¶ms); 1628} 1629 1630/* 1631 * Calculate capability information for mgt frames. 1632 */ 1633static uint16_t 1634getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1635{ 1636 struct ieee80211com *ic = vap->iv_ic; 1637 uint16_t capinfo; 1638 1639 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1640 1641 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1642 capinfo = IEEE80211_CAPINFO_ESS; 1643 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1644 capinfo = IEEE80211_CAPINFO_IBSS; 1645 else 1646 capinfo = 0; 1647 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1648 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1649 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1650 IEEE80211_IS_CHAN_2GHZ(chan)) 1651 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1652 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1653 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1654 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1655 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1656 return capinfo; 1657} 1658 1659/* 1660 * Send a management frame. The node is for the destination (or ic_bss 1661 * when in station mode). Nodes other than ic_bss have their reference 1662 * count bumped to reflect our use for an indeterminant time. 1663 */ 1664int 1665ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1666{ 1667#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1668#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1669 struct ieee80211vap *vap = ni->ni_vap; 1670 struct ieee80211com *ic = ni->ni_ic; 1671 struct ieee80211_node *bss = vap->iv_bss; 1672 struct ieee80211_bpf_params params; 1673 struct mbuf *m; 1674 uint8_t *frm; 1675 uint16_t capinfo; 1676 int has_challenge, is_shared_key, ret, status; 1677 1678 KASSERT(ni != NULL, ("null node")); 1679 1680 /* 1681 * Hold a reference on the node so it doesn't go away until after 1682 * the xmit is complete all the way in the driver. On error we 1683 * will remove our reference. 1684 */ 1685 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1686 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1687 __func__, __LINE__, 1688 ni, ether_sprintf(ni->ni_macaddr), 1689 ieee80211_node_refcnt(ni)+1); 1690 ieee80211_ref_node(ni); 1691 1692 memset(¶ms, 0, sizeof(params)); 1693 switch (type) { 1694 1695 case IEEE80211_FC0_SUBTYPE_AUTH: 1696 status = arg >> 16; 1697 arg &= 0xffff; 1698 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1699 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1700 ni->ni_challenge != NULL); 1701 1702 /* 1703 * Deduce whether we're doing open authentication or 1704 * shared key authentication. We do the latter if 1705 * we're in the middle of a shared key authentication 1706 * handshake or if we're initiating an authentication 1707 * request and configured to use shared key. 1708 */ 1709 is_shared_key = has_challenge || 1710 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1711 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1712 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1713 1714 m = ieee80211_getmgtframe(&frm, 1715 ic->ic_headroom + sizeof(struct ieee80211_frame), 1716 3 * sizeof(uint16_t) 1717 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1718 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1719 ); 1720 if (m == NULL) 1721 senderr(ENOMEM, is_tx_nobuf); 1722 1723 ((uint16_t *)frm)[0] = 1724 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1725 : htole16(IEEE80211_AUTH_ALG_OPEN); 1726 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1727 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1728 1729 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1730 ((uint16_t *)frm)[3] = 1731 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1732 IEEE80211_ELEMID_CHALLENGE); 1733 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1734 IEEE80211_CHALLENGE_LEN); 1735 m->m_pkthdr.len = m->m_len = 1736 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1737 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1738 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1739 "request encrypt frame (%s)", __func__); 1740 /* mark frame for encryption */ 1741 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1742 } 1743 } else 1744 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1745 1746 /* XXX not right for shared key */ 1747 if (status == IEEE80211_STATUS_SUCCESS) 1748 IEEE80211_NODE_STAT(ni, tx_auth); 1749 else 1750 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1751 1752 if (vap->iv_opmode == IEEE80211_M_STA) 1753 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1754 (void *) vap->iv_state); 1755 break; 1756 1757 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1758 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1759 "send station deauthenticate (reason %d)", arg); 1760 m = ieee80211_getmgtframe(&frm, 1761 ic->ic_headroom + sizeof(struct ieee80211_frame), 1762 sizeof(uint16_t)); 1763 if (m == NULL) 1764 senderr(ENOMEM, is_tx_nobuf); 1765 *(uint16_t *)frm = htole16(arg); /* reason */ 1766 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1767 1768 IEEE80211_NODE_STAT(ni, tx_deauth); 1769 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1770 1771 ieee80211_node_unauthorize(ni); /* port closed */ 1772 break; 1773 1774 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1775 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1776 /* 1777 * asreq frame format 1778 * [2] capability information 1779 * [2] listen interval 1780 * [6*] current AP address (reassoc only) 1781 * [tlv] ssid 1782 * [tlv] supported rates 1783 * [tlv] extended supported rates 1784 * [4] power capability (optional) 1785 * [28] supported channels (optional) 1786 * [tlv] HT capabilities 1787 * [tlv] WME (optional) 1788 * [tlv] Vendor OUI HT capabilities (optional) 1789 * [tlv] Atheros capabilities (if negotiated) 1790 * [tlv] AppIE's (optional) 1791 */ 1792 m = ieee80211_getmgtframe(&frm, 1793 ic->ic_headroom + sizeof(struct ieee80211_frame), 1794 sizeof(uint16_t) 1795 + sizeof(uint16_t) 1796 + IEEE80211_ADDR_LEN 1797 + 2 + IEEE80211_NWID_LEN 1798 + 2 + IEEE80211_RATE_SIZE 1799 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1800 + 4 1801 + 2 + 26 1802 + sizeof(struct ieee80211_wme_info) 1803 + sizeof(struct ieee80211_ie_htcap) 1804 + 4 + sizeof(struct ieee80211_ie_htcap) 1805#ifdef IEEE80211_SUPPORT_SUPERG 1806 + sizeof(struct ieee80211_ath_ie) 1807#endif 1808 + (vap->iv_appie_wpa != NULL ? 1809 vap->iv_appie_wpa->ie_len : 0) 1810 + (vap->iv_appie_assocreq != NULL ? 1811 vap->iv_appie_assocreq->ie_len : 0) 1812 ); 1813 if (m == NULL) 1814 senderr(ENOMEM, is_tx_nobuf); 1815 1816 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1817 ("wrong mode %u", vap->iv_opmode)); 1818 capinfo = IEEE80211_CAPINFO_ESS; 1819 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1820 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1821 /* 1822 * NB: Some 11a AP's reject the request when 1823 * short premable is set. 1824 */ 1825 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1826 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1827 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1828 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1829 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1830 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1831 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1832 (vap->iv_flags & IEEE80211_F_DOTH)) 1833 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1834 *(uint16_t *)frm = htole16(capinfo); 1835 frm += 2; 1836 1837 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1838 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1839 bss->ni_intval)); 1840 frm += 2; 1841 1842 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1843 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1844 frm += IEEE80211_ADDR_LEN; 1845 } 1846 1847 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1848 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1849 if (vap->iv_flags & IEEE80211_F_WPA2) { 1850 if (vap->iv_rsn_ie != NULL) 1851 frm = add_ie(frm, vap->iv_rsn_ie); 1852 /* XXX else complain? */ 1853 } 1854 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1855 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1856 frm = ieee80211_add_powercapability(frm, 1857 ic->ic_curchan); 1858 frm = ieee80211_add_supportedchannels(frm, ic); 1859 } 1860 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1861 ni->ni_ies.htcap_ie != NULL && 1862 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1863 frm = ieee80211_add_htcap(frm, ni); 1864 if (vap->iv_flags & IEEE80211_F_WPA1) { 1865 if (vap->iv_wpa_ie != NULL) 1866 frm = add_ie(frm, vap->iv_wpa_ie); 1867 /* XXX else complain */ 1868 } 1869 if ((ic->ic_flags & IEEE80211_F_WME) && 1870 ni->ni_ies.wme_ie != NULL) 1871 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1872 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1873 ni->ni_ies.htcap_ie != NULL && 1874 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1875 frm = ieee80211_add_htcap_vendor(frm, ni); 1876#ifdef IEEE80211_SUPPORT_SUPERG 1877 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1878 frm = ieee80211_add_ath(frm, 1879 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1880 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1881 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1882 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1883 } 1884#endif /* IEEE80211_SUPPORT_SUPERG */ 1885 if (vap->iv_appie_assocreq != NULL) 1886 frm = add_appie(frm, vap->iv_appie_assocreq); 1887 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1888 1889 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1890 (void *) vap->iv_state); 1891 break; 1892 1893 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1894 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1895 /* 1896 * asresp frame format 1897 * [2] capability information 1898 * [2] status 1899 * [2] association ID 1900 * [tlv] supported rates 1901 * [tlv] extended supported rates 1902 * [tlv] HT capabilities (standard, if STA enabled) 1903 * [tlv] HT information (standard, if STA enabled) 1904 * [tlv] WME (if configured and STA enabled) 1905 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1906 * [tlv] HT information (vendor OUI, if STA enabled) 1907 * [tlv] Atheros capabilities (if STA enabled) 1908 * [tlv] AppIE's (optional) 1909 */ 1910 m = ieee80211_getmgtframe(&frm, 1911 ic->ic_headroom + sizeof(struct ieee80211_frame), 1912 sizeof(uint16_t) 1913 + sizeof(uint16_t) 1914 + sizeof(uint16_t) 1915 + 2 + IEEE80211_RATE_SIZE 1916 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1917 + sizeof(struct ieee80211_ie_htcap) + 4 1918 + sizeof(struct ieee80211_ie_htinfo) + 4 1919 + sizeof(struct ieee80211_wme_param) 1920#ifdef IEEE80211_SUPPORT_SUPERG 1921 + sizeof(struct ieee80211_ath_ie) 1922#endif 1923 + (vap->iv_appie_assocresp != NULL ? 1924 vap->iv_appie_assocresp->ie_len : 0) 1925 ); 1926 if (m == NULL) 1927 senderr(ENOMEM, is_tx_nobuf); 1928 1929 capinfo = getcapinfo(vap, bss->ni_chan); 1930 *(uint16_t *)frm = htole16(capinfo); 1931 frm += 2; 1932 1933 *(uint16_t *)frm = htole16(arg); /* status */ 1934 frm += 2; 1935 1936 if (arg == IEEE80211_STATUS_SUCCESS) { 1937 *(uint16_t *)frm = htole16(ni->ni_associd); 1938 IEEE80211_NODE_STAT(ni, tx_assoc); 1939 } else 1940 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1941 frm += 2; 1942 1943 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1944 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1945 /* NB: respond according to what we received */ 1946 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1947 frm = ieee80211_add_htcap(frm, ni); 1948 frm = ieee80211_add_htinfo(frm, ni); 1949 } 1950 if ((vap->iv_flags & IEEE80211_F_WME) && 1951 ni->ni_ies.wme_ie != NULL) 1952 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1953 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1954 frm = ieee80211_add_htcap_vendor(frm, ni); 1955 frm = ieee80211_add_htinfo_vendor(frm, ni); 1956 } 1957#ifdef IEEE80211_SUPPORT_SUPERG 1958 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1959 frm = ieee80211_add_ath(frm, 1960 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1961 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1962 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1963 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1964#endif /* IEEE80211_SUPPORT_SUPERG */ 1965 if (vap->iv_appie_assocresp != NULL) 1966 frm = add_appie(frm, vap->iv_appie_assocresp); 1967 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1968 break; 1969 1970 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1971 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1972 "send station disassociate (reason %d)", arg); 1973 m = ieee80211_getmgtframe(&frm, 1974 ic->ic_headroom + sizeof(struct ieee80211_frame), 1975 sizeof(uint16_t)); 1976 if (m == NULL) 1977 senderr(ENOMEM, is_tx_nobuf); 1978 *(uint16_t *)frm = htole16(arg); /* reason */ 1979 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1980 1981 IEEE80211_NODE_STAT(ni, tx_disassoc); 1982 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1983 break; 1984 1985 default: 1986 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1987 "invalid mgmt frame type %u", type); 1988 senderr(EINVAL, is_tx_unknownmgt); 1989 /* NOTREACHED */ 1990 } 1991 1992 /* NB: force non-ProbeResp frames to the highest queue */ 1993 params.ibp_pri = WME_AC_VO; 1994 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1995 /* NB: we know all frames are unicast */ 1996 params.ibp_try0 = bss->ni_txparms->maxretry; 1997 params.ibp_power = bss->ni_txpower; 1998 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1999bad: 2000 ieee80211_free_node(ni); 2001 return ret; 2002#undef senderr 2003#undef HTFLAGS 2004} 2005 2006/* 2007 * Return an mbuf with a probe response frame in it. 2008 * Space is left to prepend and 802.11 header at the 2009 * front but it's left to the caller to fill in. 2010 */ 2011struct mbuf * 2012ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2013{ 2014 struct ieee80211vap *vap = bss->ni_vap; 2015 struct ieee80211com *ic = bss->ni_ic; 2016 const struct ieee80211_rateset *rs; 2017 struct mbuf *m; 2018 uint16_t capinfo; 2019 uint8_t *frm; 2020 2021 /* 2022 * probe response frame format 2023 * [8] time stamp 2024 * [2] beacon interval 2025 * [2] cabability information 2026 * [tlv] ssid 2027 * [tlv] supported rates 2028 * [tlv] parameter set (FH/DS) 2029 * [tlv] parameter set (IBSS) 2030 * [tlv] country (optional) 2031 * [3] power control (optional) 2032 * [5] channel switch announcement (CSA) (optional) 2033 * [tlv] extended rate phy (ERP) 2034 * [tlv] extended supported rates 2035 * [tlv] RSN (optional) 2036 * [tlv] HT capabilities 2037 * [tlv] HT information 2038 * [tlv] WPA (optional) 2039 * [tlv] WME (optional) 2040 * [tlv] Vendor OUI HT capabilities (optional) 2041 * [tlv] Vendor OUI HT information (optional) 2042 * [tlv] Atheros capabilities 2043 * [tlv] AppIE's (optional) 2044 */ 2045 m = ieee80211_getmgtframe(&frm, 2046 ic->ic_headroom + sizeof(struct ieee80211_frame), 2047 8 2048 + sizeof(uint16_t) 2049 + sizeof(uint16_t) 2050 + 2 + IEEE80211_NWID_LEN 2051 + 2 + IEEE80211_RATE_SIZE 2052 + 7 /* max(7,3) */ 2053 + IEEE80211_COUNTRY_MAX_SIZE 2054 + 3 2055 + sizeof(struct ieee80211_csa_ie) 2056 + 3 2057 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2058 + sizeof(struct ieee80211_ie_wpa) 2059 + sizeof(struct ieee80211_ie_htcap) 2060 + sizeof(struct ieee80211_ie_htinfo) 2061 + sizeof(struct ieee80211_ie_wpa) 2062 + sizeof(struct ieee80211_wme_param) 2063 + 4 + sizeof(struct ieee80211_ie_htcap) 2064 + 4 + sizeof(struct ieee80211_ie_htinfo) 2065#ifdef IEEE80211_SUPPORT_SUPERG 2066 + sizeof(struct ieee80211_ath_ie) 2067#endif 2068 + (vap->iv_appie_proberesp != NULL ? 2069 vap->iv_appie_proberesp->ie_len : 0) 2070 ); 2071 if (m == NULL) { 2072 vap->iv_stats.is_tx_nobuf++; 2073 return NULL; 2074 } 2075 2076 memset(frm, 0, 8); /* timestamp should be filled later */ 2077 frm += 8; 2078 *(uint16_t *)frm = htole16(bss->ni_intval); 2079 frm += 2; 2080 capinfo = getcapinfo(vap, bss->ni_chan); 2081 *(uint16_t *)frm = htole16(capinfo); 2082 frm += 2; 2083 2084 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2085 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2086 frm = ieee80211_add_rates(frm, rs); 2087 2088 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2089 *frm++ = IEEE80211_ELEMID_FHPARMS; 2090 *frm++ = 5; 2091 *frm++ = bss->ni_fhdwell & 0x00ff; 2092 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2093 *frm++ = IEEE80211_FH_CHANSET( 2094 ieee80211_chan2ieee(ic, bss->ni_chan)); 2095 *frm++ = IEEE80211_FH_CHANPAT( 2096 ieee80211_chan2ieee(ic, bss->ni_chan)); 2097 *frm++ = bss->ni_fhindex; 2098 } else { 2099 *frm++ = IEEE80211_ELEMID_DSPARMS; 2100 *frm++ = 1; 2101 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2102 } 2103 2104 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2105 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2106 *frm++ = 2; 2107 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2108 } 2109 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2110 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2111 frm = ieee80211_add_countryie(frm, ic); 2112 if (vap->iv_flags & IEEE80211_F_DOTH) { 2113 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2114 frm = ieee80211_add_powerconstraint(frm, vap); 2115 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2116 frm = ieee80211_add_csa(frm, vap); 2117 } 2118 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2119 frm = ieee80211_add_erp(frm, ic); 2120 frm = ieee80211_add_xrates(frm, rs); 2121 if (vap->iv_flags & IEEE80211_F_WPA2) { 2122 if (vap->iv_rsn_ie != NULL) 2123 frm = add_ie(frm, vap->iv_rsn_ie); 2124 /* XXX else complain? */ 2125 } 2126 /* 2127 * NB: legacy 11b clients do not get certain ie's. 2128 * The caller identifies such clients by passing 2129 * a token in legacy to us. Could expand this to be 2130 * any legacy client for stuff like HT ie's. 2131 */ 2132 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2133 legacy != IEEE80211_SEND_LEGACY_11B) { 2134 frm = ieee80211_add_htcap(frm, bss); 2135 frm = ieee80211_add_htinfo(frm, bss); 2136 } 2137 if (vap->iv_flags & IEEE80211_F_WPA1) { 2138 if (vap->iv_wpa_ie != NULL) 2139 frm = add_ie(frm, vap->iv_wpa_ie); 2140 /* XXX else complain? */ 2141 } 2142 if (vap->iv_flags & IEEE80211_F_WME) 2143 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2144 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2145 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2146 legacy != IEEE80211_SEND_LEGACY_11B) { 2147 frm = ieee80211_add_htcap_vendor(frm, bss); 2148 frm = ieee80211_add_htinfo_vendor(frm, bss); 2149 } 2150#ifdef IEEE80211_SUPPORT_SUPERG 2151 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2152 legacy != IEEE80211_SEND_LEGACY_11B) 2153 frm = ieee80211_add_athcaps(frm, bss); 2154#endif 2155 if (vap->iv_appie_proberesp != NULL) 2156 frm = add_appie(frm, vap->iv_appie_proberesp); 2157 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2158 2159 return m; 2160} 2161 2162/* 2163 * Send a probe response frame to the specified mac address. 2164 * This does not go through the normal mgt frame api so we 2165 * can specify the destination address and re-use the bss node 2166 * for the sta reference. 2167 */ 2168int 2169ieee80211_send_proberesp(struct ieee80211vap *vap, 2170 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2171{ 2172 struct ieee80211_node *bss = vap->iv_bss; 2173 struct ieee80211com *ic = vap->iv_ic; 2174 struct ieee80211_frame *wh; 2175 struct mbuf *m; 2176 2177 if (vap->iv_state == IEEE80211_S_CAC) { 2178 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2179 "block %s frame in CAC state", "probe response"); 2180 vap->iv_stats.is_tx_badstate++; 2181 return EIO; /* XXX */ 2182 } 2183 2184 /* 2185 * Hold a reference on the node so it doesn't go away until after 2186 * the xmit is complete all the way in the driver. On error we 2187 * will remove our reference. 2188 */ 2189 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2190 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2191 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2192 ieee80211_node_refcnt(bss)+1); 2193 ieee80211_ref_node(bss); 2194 2195 m = ieee80211_alloc_proberesp(bss, legacy); 2196 if (m == NULL) { 2197 ieee80211_free_node(bss); 2198 return ENOMEM; 2199 } 2200 2201 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2202 KASSERT(m != NULL, ("no room for header")); 2203 2204 wh = mtod(m, struct ieee80211_frame *); 2205 ieee80211_send_setup(bss, m, 2206 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2207 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2208 /* XXX power management? */ 2209 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2210 2211 M_WME_SETAC(m, WME_AC_BE); 2212 2213 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2214 "send probe resp on channel %u to %s%s\n", 2215 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2216 legacy ? " <legacy>" : ""); 2217 IEEE80211_NODE_STAT(bss, tx_mgmt); 2218 2219 return ic->ic_raw_xmit(bss, m, NULL); 2220} 2221 2222/* 2223 * Allocate and build a RTS (Request To Send) control frame. 2224 */ 2225struct mbuf * 2226ieee80211_alloc_rts(struct ieee80211com *ic, 2227 const uint8_t ra[IEEE80211_ADDR_LEN], 2228 const uint8_t ta[IEEE80211_ADDR_LEN], 2229 uint16_t dur) 2230{ 2231 struct ieee80211_frame_rts *rts; 2232 struct mbuf *m; 2233 2234 /* XXX honor ic_headroom */ 2235 m = m_gethdr(M_DONTWAIT, MT_DATA); 2236 if (m != NULL) { 2237 rts = mtod(m, struct ieee80211_frame_rts *); 2238 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2239 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2240 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2241 *(u_int16_t *)rts->i_dur = htole16(dur); 2242 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2243 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2244 2245 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2246 } 2247 return m; 2248} 2249 2250/* 2251 * Allocate and build a CTS (Clear To Send) control frame. 2252 */ 2253struct mbuf * 2254ieee80211_alloc_cts(struct ieee80211com *ic, 2255 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2256{ 2257 struct ieee80211_frame_cts *cts; 2258 struct mbuf *m; 2259 2260 /* XXX honor ic_headroom */ 2261 m = m_gethdr(M_DONTWAIT, MT_DATA); 2262 if (m != NULL) { 2263 cts = mtod(m, struct ieee80211_frame_cts *); 2264 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2265 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2266 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2267 *(u_int16_t *)cts->i_dur = htole16(dur); 2268 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2269 2270 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2271 } 2272 return m; 2273} 2274 2275static void 2276ieee80211_tx_mgt_timeout(void *arg) 2277{ 2278 struct ieee80211_node *ni = arg; 2279 struct ieee80211vap *vap = ni->ni_vap; 2280 2281 if (vap->iv_state != IEEE80211_S_INIT && 2282 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2283 /* 2284 * NB: it's safe to specify a timeout as the reason here; 2285 * it'll only be used in the right state. 2286 */ 2287 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2288 IEEE80211_SCAN_FAIL_TIMEOUT); 2289 } 2290} 2291 2292static void 2293ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2294{ 2295 struct ieee80211vap *vap = ni->ni_vap; 2296 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2297 2298 /* 2299 * Frame transmit completed; arrange timer callback. If 2300 * transmit was successfuly we wait for response. Otherwise 2301 * we arrange an immediate callback instead of doing the 2302 * callback directly since we don't know what state the driver 2303 * is in (e.g. what locks it is holding). This work should 2304 * not be too time-critical and not happen too often so the 2305 * added overhead is acceptable. 2306 * 2307 * XXX what happens if !acked but response shows up before callback? 2308 */ 2309 if (vap->iv_state == ostate) 2310 callout_reset(&vap->iv_mgtsend, 2311 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2312 ieee80211_tx_mgt_timeout, ni); 2313} 2314 2315static void 2316ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2317 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2318{ 2319 struct ieee80211vap *vap = ni->ni_vap; 2320 struct ieee80211com *ic = ni->ni_ic; 2321 struct ieee80211_rateset *rs = &ni->ni_rates; 2322 uint16_t capinfo; 2323 2324 /* 2325 * beacon frame format 2326 * [8] time stamp 2327 * [2] beacon interval 2328 * [2] cabability information 2329 * [tlv] ssid 2330 * [tlv] supported rates 2331 * [3] parameter set (DS) 2332 * [8] CF parameter set (optional) 2333 * [tlv] parameter set (IBSS/TIM) 2334 * [tlv] country (optional) 2335 * [3] power control (optional) 2336 * [5] channel switch announcement (CSA) (optional) 2337 * [tlv] extended rate phy (ERP) 2338 * [tlv] extended supported rates 2339 * [tlv] RSN parameters 2340 * [tlv] HT capabilities 2341 * [tlv] HT information 2342 * XXX Vendor-specific OIDs (e.g. Atheros) 2343 * [tlv] WPA parameters 2344 * [tlv] WME parameters 2345 * [tlv] Vendor OUI HT capabilities (optional) 2346 * [tlv] Vendor OUI HT information (optional) 2347 * [tlv] Atheros capabilities (optional) 2348 * [tlv] TDMA parameters (optional) 2349 * [tlv] application data (optional) 2350 */ 2351 2352 memset(bo, 0, sizeof(*bo)); 2353 2354 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2355 frm += 8; 2356 *(uint16_t *)frm = htole16(ni->ni_intval); 2357 frm += 2; 2358 capinfo = getcapinfo(vap, ni->ni_chan); 2359 bo->bo_caps = (uint16_t *)frm; 2360 *(uint16_t *)frm = htole16(capinfo); 2361 frm += 2; 2362 *frm++ = IEEE80211_ELEMID_SSID; 2363 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2364 *frm++ = ni->ni_esslen; 2365 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2366 frm += ni->ni_esslen; 2367 } else 2368 *frm++ = 0; 2369 frm = ieee80211_add_rates(frm, rs); 2370 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2371 *frm++ = IEEE80211_ELEMID_DSPARMS; 2372 *frm++ = 1; 2373 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2374 } 2375 if (ic->ic_flags & IEEE80211_F_PCF) { 2376 bo->bo_cfp = frm; 2377 frm = ieee80211_add_cfparms(frm, ic); 2378 } 2379 bo->bo_tim = frm; 2380 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2381 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2382 *frm++ = 2; 2383 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2384 bo->bo_tim_len = 0; 2385 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2386 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2387 2388 tie->tim_ie = IEEE80211_ELEMID_TIM; 2389 tie->tim_len = 4; /* length */ 2390 tie->tim_count = 0; /* DTIM count */ 2391 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2392 tie->tim_bitctl = 0; /* bitmap control */ 2393 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2394 frm += sizeof(struct ieee80211_tim_ie); 2395 bo->bo_tim_len = 1; 2396 } 2397 bo->bo_tim_trailer = frm; 2398 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2399 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2400 frm = ieee80211_add_countryie(frm, ic); 2401 if (vap->iv_flags & IEEE80211_F_DOTH) { 2402 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2403 frm = ieee80211_add_powerconstraint(frm, vap); 2404 bo->bo_csa = frm; 2405 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2406 frm = ieee80211_add_csa(frm, vap); 2407 } else 2408 bo->bo_csa = frm; 2409 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2410 bo->bo_erp = frm; 2411 frm = ieee80211_add_erp(frm, ic); 2412 } 2413 frm = ieee80211_add_xrates(frm, rs); 2414 if (vap->iv_flags & IEEE80211_F_WPA2) { 2415 if (vap->iv_rsn_ie != NULL) 2416 frm = add_ie(frm, vap->iv_rsn_ie); 2417 /* XXX else complain */ 2418 } 2419 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2420 frm = ieee80211_add_htcap(frm, ni); 2421 bo->bo_htinfo = frm; 2422 frm = ieee80211_add_htinfo(frm, ni); 2423 } 2424 if (vap->iv_flags & IEEE80211_F_WPA1) { 2425 if (vap->iv_wpa_ie != NULL) 2426 frm = add_ie(frm, vap->iv_wpa_ie); 2427 /* XXX else complain */ 2428 } 2429 if (vap->iv_flags & IEEE80211_F_WME) { 2430 bo->bo_wme = frm; 2431 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2432 } 2433 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2434 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2435 frm = ieee80211_add_htcap_vendor(frm, ni); 2436 frm = ieee80211_add_htinfo_vendor(frm, ni); 2437 } 2438#ifdef IEEE80211_SUPPORT_SUPERG 2439 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2440 bo->bo_ath = frm; 2441 frm = ieee80211_add_athcaps(frm, ni); 2442 } 2443#endif 2444#ifdef IEEE80211_SUPPORT_TDMA 2445 if (vap->iv_caps & IEEE80211_C_TDMA) { 2446 bo->bo_tdma = frm; 2447 frm = ieee80211_add_tdma(frm, vap); 2448 } 2449#endif 2450 if (vap->iv_appie_beacon != NULL) { 2451 bo->bo_appie = frm; 2452 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2453 frm = add_appie(frm, vap->iv_appie_beacon); 2454 } 2455 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2456 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2457 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2458} 2459 2460/* 2461 * Allocate a beacon frame and fillin the appropriate bits. 2462 */ 2463struct mbuf * 2464ieee80211_beacon_alloc(struct ieee80211_node *ni, 2465 struct ieee80211_beacon_offsets *bo) 2466{ 2467 struct ieee80211vap *vap = ni->ni_vap; 2468 struct ieee80211com *ic = ni->ni_ic; 2469 struct ifnet *ifp = vap->iv_ifp; 2470 struct ieee80211_frame *wh; 2471 struct mbuf *m; 2472 int pktlen; 2473 uint8_t *frm; 2474 2475 /* 2476 * beacon frame format 2477 * [8] time stamp 2478 * [2] beacon interval 2479 * [2] cabability information 2480 * [tlv] ssid 2481 * [tlv] supported rates 2482 * [3] parameter set (DS) 2483 * [8] CF parameter set (optional) 2484 * [tlv] parameter set (IBSS/TIM) 2485 * [tlv] country (optional) 2486 * [3] power control (optional) 2487 * [5] channel switch announcement (CSA) (optional) 2488 * [tlv] extended rate phy (ERP) 2489 * [tlv] extended supported rates 2490 * [tlv] RSN parameters 2491 * [tlv] HT capabilities 2492 * [tlv] HT information 2493 * [tlv] Vendor OUI HT capabilities (optional) 2494 * [tlv] Vendor OUI HT information (optional) 2495 * XXX Vendor-specific OIDs (e.g. Atheros) 2496 * [tlv] WPA parameters 2497 * [tlv] WME parameters 2498 * [tlv] TDMA parameters (optional) 2499 * [tlv] application data (optional) 2500 * NB: we allocate the max space required for the TIM bitmap. 2501 * XXX how big is this? 2502 */ 2503 pktlen = 8 /* time stamp */ 2504 + sizeof(uint16_t) /* beacon interval */ 2505 + sizeof(uint16_t) /* capabilities */ 2506 + 2 + ni->ni_esslen /* ssid */ 2507 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2508 + 2 + 1 /* DS parameters */ 2509 + 2 + 6 /* CF parameters */ 2510 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2511 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2512 + 2 + 1 /* power control */ 2513 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2514 + 2 + 1 /* ERP */ 2515 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2516 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2517 2*sizeof(struct ieee80211_ie_wpa) : 0) 2518 /* XXX conditional? */ 2519 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2520 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2521 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2522 sizeof(struct ieee80211_wme_param) : 0) 2523#ifdef IEEE80211_SUPPORT_SUPERG 2524 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2525#endif 2526#ifdef IEEE80211_SUPPORT_TDMA 2527 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2528 sizeof(struct ieee80211_tdma_param) : 0) 2529#endif 2530 + IEEE80211_MAX_APPIE 2531 ; 2532 m = ieee80211_getmgtframe(&frm, 2533 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2534 if (m == NULL) { 2535 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2536 "%s: cannot get buf; size %u\n", __func__, pktlen); 2537 vap->iv_stats.is_tx_nobuf++; 2538 return NULL; 2539 } 2540 ieee80211_beacon_construct(m, frm, bo, ni); 2541 2542 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2543 KASSERT(m != NULL, ("no space for 802.11 header?")); 2544 wh = mtod(m, struct ieee80211_frame *); 2545 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2546 IEEE80211_FC0_SUBTYPE_BEACON; 2547 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2548 *(uint16_t *)wh->i_dur = 0; 2549 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2550 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2551 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2552 *(uint16_t *)wh->i_seq = 0; 2553 2554 return m; 2555} 2556 2557/* 2558 * Update the dynamic parts of a beacon frame based on the current state. 2559 */ 2560int 2561ieee80211_beacon_update(struct ieee80211_node *ni, 2562 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2563{ 2564 struct ieee80211vap *vap = ni->ni_vap; 2565 struct ieee80211com *ic = ni->ni_ic; 2566 int len_changed = 0; 2567 uint16_t capinfo; 2568 2569 IEEE80211_LOCK(ic); 2570 /* 2571 * Handle 11h channel change when we've reached the count. 2572 * We must recalculate the beacon frame contents to account 2573 * for the new channel. Note we do this only for the first 2574 * vap that reaches this point; subsequent vaps just update 2575 * their beacon state to reflect the recalculated channel. 2576 */ 2577 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2578 vap->iv_csa_count == ic->ic_csa_count) { 2579 vap->iv_csa_count = 0; 2580 /* 2581 * Effect channel change before reconstructing the beacon 2582 * frame contents as many places reference ni_chan. 2583 */ 2584 if (ic->ic_csa_newchan != NULL) 2585 ieee80211_csa_completeswitch(ic); 2586 /* 2587 * NB: ieee80211_beacon_construct clears all pending 2588 * updates in bo_flags so we don't need to explicitly 2589 * clear IEEE80211_BEACON_CSA. 2590 */ 2591 ieee80211_beacon_construct(m, 2592 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2593 2594 /* XXX do WME aggressive mode processing? */ 2595 IEEE80211_UNLOCK(ic); 2596 return 1; /* just assume length changed */ 2597 } 2598 2599 /* XXX faster to recalculate entirely or just changes? */ 2600 capinfo = getcapinfo(vap, ni->ni_chan); 2601 *bo->bo_caps = htole16(capinfo); 2602 2603 if (vap->iv_flags & IEEE80211_F_WME) { 2604 struct ieee80211_wme_state *wme = &ic->ic_wme; 2605 2606 /* 2607 * Check for agressive mode change. When there is 2608 * significant high priority traffic in the BSS 2609 * throttle back BE traffic by using conservative 2610 * parameters. Otherwise BE uses agressive params 2611 * to optimize performance of legacy/non-QoS traffic. 2612 */ 2613 if (wme->wme_flags & WME_F_AGGRMODE) { 2614 if (wme->wme_hipri_traffic > 2615 wme->wme_hipri_switch_thresh) { 2616 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2617 "%s: traffic %u, disable aggressive mode\n", 2618 __func__, wme->wme_hipri_traffic); 2619 wme->wme_flags &= ~WME_F_AGGRMODE; 2620 ieee80211_wme_updateparams_locked(vap); 2621 wme->wme_hipri_traffic = 2622 wme->wme_hipri_switch_hysteresis; 2623 } else 2624 wme->wme_hipri_traffic = 0; 2625 } else { 2626 if (wme->wme_hipri_traffic <= 2627 wme->wme_hipri_switch_thresh) { 2628 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2629 "%s: traffic %u, enable aggressive mode\n", 2630 __func__, wme->wme_hipri_traffic); 2631 wme->wme_flags |= WME_F_AGGRMODE; 2632 ieee80211_wme_updateparams_locked(vap); 2633 wme->wme_hipri_traffic = 0; 2634 } else 2635 wme->wme_hipri_traffic = 2636 wme->wme_hipri_switch_hysteresis; 2637 } 2638 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2639 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2640 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2641 } 2642 } 2643 2644 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2645 ieee80211_ht_update_beacon(vap, bo); 2646 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2647 } 2648#ifdef IEEE80211_SUPPORT_TDMA 2649 if (vap->iv_caps & IEEE80211_C_TDMA) { 2650 /* 2651 * NB: the beacon is potentially updated every TBTT. 2652 */ 2653 ieee80211_tdma_update_beacon(vap, bo); 2654 } 2655#endif 2656 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2657 struct ieee80211_tim_ie *tie = 2658 (struct ieee80211_tim_ie *) bo->bo_tim; 2659 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2660 u_int timlen, timoff, i; 2661 /* 2662 * ATIM/DTIM needs updating. If it fits in the 2663 * current space allocated then just copy in the 2664 * new bits. Otherwise we need to move any trailing 2665 * data to make room. Note that we know there is 2666 * contiguous space because ieee80211_beacon_allocate 2667 * insures there is space in the mbuf to write a 2668 * maximal-size virtual bitmap (based on iv_max_aid). 2669 */ 2670 /* 2671 * Calculate the bitmap size and offset, copy any 2672 * trailer out of the way, and then copy in the 2673 * new bitmap and update the information element. 2674 * Note that the tim bitmap must contain at least 2675 * one byte and any offset must be even. 2676 */ 2677 if (vap->iv_ps_pending != 0) { 2678 timoff = 128; /* impossibly large */ 2679 for (i = 0; i < vap->iv_tim_len; i++) 2680 if (vap->iv_tim_bitmap[i]) { 2681 timoff = i &~ 1; 2682 break; 2683 } 2684 KASSERT(timoff != 128, ("tim bitmap empty!")); 2685 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2686 if (vap->iv_tim_bitmap[i]) 2687 break; 2688 timlen = 1 + (i - timoff); 2689 } else { 2690 timoff = 0; 2691 timlen = 1; 2692 } 2693 if (timlen != bo->bo_tim_len) { 2694 /* copy up/down trailer */ 2695 int adjust = tie->tim_bitmap+timlen 2696 - bo->bo_tim_trailer; 2697 ovbcopy(bo->bo_tim_trailer, 2698 bo->bo_tim_trailer+adjust, 2699 bo->bo_tim_trailer_len); 2700 bo->bo_tim_trailer += adjust; 2701 bo->bo_erp += adjust; 2702 bo->bo_htinfo += adjust; 2703#ifdef IEEE80211_SUPERG_SUPPORT 2704 bo->bo_ath += adjust; 2705#endif 2706#ifdef IEEE80211_TDMA_SUPPORT 2707 bo->bo_tdma += adjust; 2708#endif 2709 bo->bo_appie += adjust; 2710 bo->bo_wme += adjust; 2711 bo->bo_csa += adjust; 2712 bo->bo_tim_len = timlen; 2713 2714 /* update information element */ 2715 tie->tim_len = 3 + timlen; 2716 tie->tim_bitctl = timoff; 2717 len_changed = 1; 2718 } 2719 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2720 bo->bo_tim_len); 2721 2722 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2723 2724 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2725 "%s: TIM updated, pending %u, off %u, len %u\n", 2726 __func__, vap->iv_ps_pending, timoff, timlen); 2727 } 2728 /* count down DTIM period */ 2729 if (tie->tim_count == 0) 2730 tie->tim_count = tie->tim_period - 1; 2731 else 2732 tie->tim_count--; 2733 /* update state for buffered multicast frames on DTIM */ 2734 if (mcast && tie->tim_count == 0) 2735 tie->tim_bitctl |= 1; 2736 else 2737 tie->tim_bitctl &= ~1; 2738 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2739 struct ieee80211_csa_ie *csa = 2740 (struct ieee80211_csa_ie *) bo->bo_csa; 2741 2742 /* 2743 * Insert or update CSA ie. If we're just starting 2744 * to count down to the channel switch then we need 2745 * to insert the CSA ie. Otherwise we just need to 2746 * drop the count. The actual change happens above 2747 * when the vap's count reaches the target count. 2748 */ 2749 if (vap->iv_csa_count == 0) { 2750 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2751 bo->bo_erp += sizeof(*csa); 2752 bo->bo_htinfo += sizeof(*csa); 2753 bo->bo_wme += sizeof(*csa); 2754#ifdef IEEE80211_SUPERG_SUPPORT 2755 bo->bo_ath += sizeof(*csa); 2756#endif 2757#ifdef IEEE80211_TDMA_SUPPORT 2758 bo->bo_tdma += sizeof(*csa); 2759#endif 2760 bo->bo_appie += sizeof(*csa); 2761 bo->bo_csa_trailer_len += sizeof(*csa); 2762 bo->bo_tim_trailer_len += sizeof(*csa); 2763 m->m_len += sizeof(*csa); 2764 m->m_pkthdr.len += sizeof(*csa); 2765 2766 ieee80211_add_csa(bo->bo_csa, vap); 2767 } else 2768 csa->csa_count--; 2769 vap->iv_csa_count++; 2770 /* NB: don't clear IEEE80211_BEACON_CSA */ 2771 } 2772 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2773 /* 2774 * ERP element needs updating. 2775 */ 2776 (void) ieee80211_add_erp(bo->bo_erp, ic); 2777 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2778 } 2779#ifdef IEEE80211_SUPPORT_SUPERG 2780 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2781 ieee80211_add_athcaps(bo->bo_ath, ni); 2782 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2783 } 2784#endif 2785 } 2786 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2787 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2788 int aielen; 2789 uint8_t *frm; 2790 2791 aielen = 0; 2792 if (aie != NULL) 2793 aielen += aie->ie_len; 2794 if (aielen != bo->bo_appie_len) { 2795 /* copy up/down trailer */ 2796 int adjust = aielen - bo->bo_appie_len; 2797 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2798 bo->bo_tim_trailer_len); 2799 bo->bo_tim_trailer += adjust; 2800 bo->bo_appie += adjust; 2801 bo->bo_appie_len = aielen; 2802 2803 len_changed = 1; 2804 } 2805 frm = bo->bo_appie; 2806 if (aie != NULL) 2807 frm = add_appie(frm, aie); 2808 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2809 } 2810 IEEE80211_UNLOCK(ic); 2811 2812 return len_changed; 2813} 2814