ieee80211_output.c revision 191536
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 191536 2009-04-26 21:11:12Z 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 error = parent->if_transmit(parent, m); 277 if (error != 0) { 278 /* NB: IFQ_HANDOFF reclaims mbuf */ 279 ieee80211_free_node(ni); 280 } else { 281 ifp->if_opackets++; 282 } 283 ic->ic_lastdata = ticks; 284 } 285#undef IS_DWDS 286} 287 288/* 289 * 802.11 output routine. This is (currently) used only to 290 * connect bpf write calls to the 802.11 layer for injecting 291 * raw 802.11 frames. Note we locate the ieee80211com from 292 * the ifnet using a spare field setup at attach time. This 293 * will go away when the virtual ap support comes in. 294 */ 295int 296ieee80211_output(struct ifnet *ifp, struct mbuf *m, 297 struct sockaddr *dst, struct route *ro) 298{ 299#define senderr(e) do { error = (e); goto bad;} while (0) 300 struct ieee80211_node *ni = NULL; 301 struct ieee80211vap *vap; 302 struct ieee80211_frame *wh; 303 int error; 304 305 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 306 /* 307 * Short-circuit requests if the vap is marked OACTIVE 308 * as this is used when tearing down state to indicate 309 * the vap may be gone. This can also happen because a 310 * packet came down through ieee80211_start before the 311 * vap entered RUN state in which case it's also ok to 312 * just drop the frame. This should not be necessary 313 * but callers of if_output don't check OACTIVE. 314 */ 315 senderr(ENETDOWN); 316 } 317 vap = ifp->if_softc; 318 /* 319 * Hand to the 802.3 code if not tagged as 320 * a raw 802.11 frame. 321 */ 322 if (dst->sa_family != AF_IEEE80211) 323 return vap->iv_output(ifp, m, dst, ro); 324#ifdef MAC 325 error = mac_check_ifnet_transmit(ifp, m); 326 if (error) 327 senderr(error); 328#endif 329 if (ifp->if_flags & IFF_MONITOR) 330 senderr(ENETDOWN); 331 if (!IFNET_IS_UP_RUNNING(ifp)) 332 senderr(ENETDOWN); 333 if (vap->iv_state == IEEE80211_S_CAC) { 334 IEEE80211_DPRINTF(vap, 335 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 336 "block %s frame in CAC state\n", "raw data"); 337 vap->iv_stats.is_tx_badstate++; 338 senderr(EIO); /* XXX */ 339 } 340 /* XXX bypass bridge, pfil, carp, etc. */ 341 342 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 343 senderr(EIO); /* XXX */ 344 wh = mtod(m, struct ieee80211_frame *); 345 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 346 IEEE80211_FC0_VERSION_0) 347 senderr(EIO); /* XXX */ 348 349 /* locate destination node */ 350 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 351 case IEEE80211_FC1_DIR_NODS: 352 case IEEE80211_FC1_DIR_FROMDS: 353 ni = ieee80211_find_txnode(vap, wh->i_addr1); 354 break; 355 case IEEE80211_FC1_DIR_TODS: 356 case IEEE80211_FC1_DIR_DSTODS: 357 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 358 senderr(EIO); /* XXX */ 359 ni = ieee80211_find_txnode(vap, wh->i_addr3); 360 break; 361 default: 362 senderr(EIO); /* XXX */ 363 } 364 if (ni == NULL) { 365 /* 366 * Permit packets w/ bpf params through regardless 367 * (see below about sa_len). 368 */ 369 if (dst->sa_len == 0) 370 senderr(EHOSTUNREACH); 371 ni = ieee80211_ref_node(vap->iv_bss); 372 } 373 374 /* 375 * Sanitize mbuf for net80211 flags leaked from above. 376 * 377 * NB: This must be done before ieee80211_classify as 378 * it marks EAPOL in frames with M_EAPOL. 379 */ 380 m->m_flags &= ~M_80211_TX; 381 382 /* calculate priority so drivers can find the tx queue */ 383 /* XXX assumes an 802.3 frame */ 384 if (ieee80211_classify(ni, m)) 385 senderr(EIO); /* XXX */ 386 387 if (bpf_peers_present(vap->iv_rawbpf)) 388 bpf_mtap(vap->iv_rawbpf, m); 389 390 IEEE80211_NODE_STAT(ni, tx_data); 391 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 392 IEEE80211_NODE_STAT(ni, tx_mcast); 393 m->m_flags |= M_MCAST; 394 } else 395 IEEE80211_NODE_STAT(ni, tx_ucast); 396 /* NB: ieee80211_encap does not include 802.11 header */ 397 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 398 399 /* 400 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 401 * present by setting the sa_len field of the sockaddr (yes, 402 * this is a hack). 403 * NB: we assume sa_data is suitably aligned to cast. 404 */ 405 return vap->iv_ic->ic_raw_xmit(ni, m, 406 (const struct ieee80211_bpf_params *)(dst->sa_len ? 407 dst->sa_data : NULL)); 408bad: 409 if (m != NULL) 410 m_freem(m); 411 if (ni != NULL) 412 ieee80211_free_node(ni); 413 return error; 414#undef senderr 415} 416 417/* 418 * Set the direction field and address fields of an outgoing 419 * frame. Note this should be called early on in constructing 420 * a frame as it sets i_fc[1]; other bits can then be or'd in. 421 */ 422static void 423ieee80211_send_setup( 424 struct ieee80211_node *ni, 425 struct ieee80211_frame *wh, 426 int type, int tid, 427 const uint8_t sa[IEEE80211_ADDR_LEN], 428 const uint8_t da[IEEE80211_ADDR_LEN], 429 const uint8_t bssid[IEEE80211_ADDR_LEN]) 430{ 431#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 432 433 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 434 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 435 struct ieee80211vap *vap = ni->ni_vap; 436 437 switch (vap->iv_opmode) { 438 case IEEE80211_M_STA: 439 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 440 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 441 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 442 IEEE80211_ADDR_COPY(wh->i_addr3, da); 443 break; 444 case IEEE80211_M_IBSS: 445 case IEEE80211_M_AHDEMO: 446 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 447 IEEE80211_ADDR_COPY(wh->i_addr1, da); 448 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 449 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 450 break; 451 case IEEE80211_M_HOSTAP: 452 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 453 IEEE80211_ADDR_COPY(wh->i_addr1, da); 454 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 455 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 456 break; 457 case IEEE80211_M_WDS: 458 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 459 IEEE80211_ADDR_COPY(wh->i_addr1, da); 460 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 461 IEEE80211_ADDR_COPY(wh->i_addr3, da); 462 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 463 break; 464 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 465 break; 466 } 467 } else { 468 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 469 IEEE80211_ADDR_COPY(wh->i_addr1, da); 470 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 471 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 472 } 473 *(uint16_t *)&wh->i_dur[0] = 0; 474 *(uint16_t *)&wh->i_seq[0] = 475 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 476 ni->ni_txseqs[tid]++; 477#undef WH4 478} 479 480/* 481 * Send a management frame to the specified node. The node pointer 482 * must have a reference as the pointer will be passed to the driver 483 * and potentially held for a long time. If the frame is successfully 484 * dispatched to the driver, then it is responsible for freeing the 485 * reference (and potentially free'ing up any associated storage); 486 * otherwise deal with reclaiming any reference (on error). 487 */ 488int 489ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 490 struct ieee80211_bpf_params *params) 491{ 492 struct ieee80211vap *vap = ni->ni_vap; 493 struct ieee80211com *ic = ni->ni_ic; 494 struct ieee80211_frame *wh; 495 496 KASSERT(ni != NULL, ("null node")); 497 498 if (vap->iv_state == IEEE80211_S_CAC) { 499 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 500 ni, "block %s frame in CAC state", 501 ieee80211_mgt_subtype_name[ 502 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 503 IEEE80211_FC0_SUBTYPE_SHIFT]); 504 vap->iv_stats.is_tx_badstate++; 505 ieee80211_free_node(ni); 506 m_freem(m); 507 return EIO; /* XXX */ 508 } 509 510 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 511 if (m == NULL) { 512 ieee80211_free_node(ni); 513 return ENOMEM; 514 } 515 516 wh = mtod(m, struct ieee80211_frame *); 517 ieee80211_send_setup(ni, wh, 518 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 519 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 520 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 521 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 522 "encrypting frame (%s)", __func__); 523 wh->i_fc[1] |= IEEE80211_FC1_WEP; 524 } 525 m->m_flags |= M_ENCAP; /* mark encapsulated */ 526 527 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 528 M_WME_SETAC(m, params->ibp_pri); 529 530#ifdef IEEE80211_DEBUG 531 /* avoid printing too many frames */ 532 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 533 ieee80211_msg_dumppkts(vap)) { 534 printf("[%s] send %s on channel %u\n", 535 ether_sprintf(wh->i_addr1), 536 ieee80211_mgt_subtype_name[ 537 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 538 IEEE80211_FC0_SUBTYPE_SHIFT], 539 ieee80211_chan2ieee(ic, ic->ic_curchan)); 540 } 541#endif 542 IEEE80211_NODE_STAT(ni, tx_mgmt); 543 544 return ic->ic_raw_xmit(ni, m, params); 545} 546 547/* 548 * Send a null data frame to the specified node. If the station 549 * is setup for QoS then a QoS Null Data frame is constructed. 550 * If this is a WDS station then a 4-address frame is constructed. 551 * 552 * NB: the caller is assumed to have setup a node reference 553 * for use; this is necessary to deal with a race condition 554 * when probing for inactive stations. Like ieee80211_mgmt_output 555 * we must cleanup any node reference on error; however we 556 * can safely just unref it as we know it will never be the 557 * last reference to the node. 558 */ 559int 560ieee80211_send_nulldata(struct ieee80211_node *ni) 561{ 562 struct ieee80211vap *vap = ni->ni_vap; 563 struct ieee80211com *ic = ni->ni_ic; 564 struct mbuf *m; 565 struct ieee80211_frame *wh; 566 int hdrlen; 567 uint8_t *frm; 568 569 if (vap->iv_state == IEEE80211_S_CAC) { 570 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 571 ni, "block %s frame in CAC state", "null data"); 572 ieee80211_unref_node(&ni); 573 vap->iv_stats.is_tx_badstate++; 574 return EIO; /* XXX */ 575 } 576 577 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 578 hdrlen = sizeof(struct ieee80211_qosframe); 579 else 580 hdrlen = sizeof(struct ieee80211_frame); 581 /* NB: only WDS vap's get 4-address frames */ 582 if (vap->iv_opmode == IEEE80211_M_WDS) 583 hdrlen += IEEE80211_ADDR_LEN; 584 if (ic->ic_flags & IEEE80211_F_DATAPAD) 585 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 586 587 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 588 if (m == NULL) { 589 /* XXX debug msg */ 590 ieee80211_unref_node(&ni); 591 vap->iv_stats.is_tx_nobuf++; 592 return ENOMEM; 593 } 594 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 595 ("leading space %zd", M_LEADINGSPACE(m))); 596 M_PREPEND(m, hdrlen, M_DONTWAIT); 597 if (m == NULL) { 598 /* NB: cannot happen */ 599 ieee80211_free_node(ni); 600 return ENOMEM; 601 } 602 603 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 604 if (ni->ni_flags & IEEE80211_NODE_QOS) { 605 const int tid = WME_AC_TO_TID(WME_AC_BE); 606 uint8_t *qos; 607 608 ieee80211_send_setup(ni, wh, 609 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 610 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 611 612 if (vap->iv_opmode == IEEE80211_M_WDS) 613 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 614 else 615 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 616 qos[0] = tid & IEEE80211_QOS_TID; 617 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 618 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 619 qos[1] = 0; 620 } else { 621 ieee80211_send_setup(ni, wh, 622 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 623 IEEE80211_NONQOS_TID, 624 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 625 } 626 if (vap->iv_opmode != IEEE80211_M_WDS) { 627 /* NB: power management bit is never sent by an AP */ 628 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 629 vap->iv_opmode != IEEE80211_M_HOSTAP) 630 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 631 } 632 m->m_len = m->m_pkthdr.len = hdrlen; 633 m->m_flags |= M_ENCAP; /* mark encapsulated */ 634 635 M_WME_SETAC(m, WME_AC_BE); 636 637 IEEE80211_NODE_STAT(ni, tx_data); 638 639 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 640 "send %snull data frame on channel %u, pwr mgt %s", 641 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 642 ieee80211_chan2ieee(ic, ic->ic_curchan), 643 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 644 645 return ic->ic_raw_xmit(ni, m, NULL); 646} 647 648/* 649 * Assign priority to a frame based on any vlan tag assigned 650 * to the station and/or any Diffserv setting in an IP header. 651 * Finally, if an ACM policy is setup (in station mode) it's 652 * applied. 653 */ 654int 655ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 656{ 657 const struct ether_header *eh = mtod(m, struct ether_header *); 658 int v_wme_ac, d_wme_ac, ac; 659 660 /* 661 * Always promote PAE/EAPOL frames to high priority. 662 */ 663 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 664 /* NB: mark so others don't need to check header */ 665 m->m_flags |= M_EAPOL; 666 ac = WME_AC_VO; 667 goto done; 668 } 669 /* 670 * Non-qos traffic goes to BE. 671 */ 672 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 673 ac = WME_AC_BE; 674 goto done; 675 } 676 677 /* 678 * If node has a vlan tag then all traffic 679 * to it must have a matching tag. 680 */ 681 v_wme_ac = 0; 682 if (ni->ni_vlan != 0) { 683 if ((m->m_flags & M_VLANTAG) == 0) { 684 IEEE80211_NODE_STAT(ni, tx_novlantag); 685 return 1; 686 } 687 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 688 EVL_VLANOFTAG(ni->ni_vlan)) { 689 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 690 return 1; 691 } 692 /* map vlan priority to AC */ 693 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 694 } 695 696#ifdef INET 697 if (eh->ether_type == htons(ETHERTYPE_IP)) { 698 uint8_t tos; 699 /* 700 * IP frame, map the DSCP bits from the TOS field. 701 */ 702 /* XXX m_copydata may be too slow for fast path */ 703 /* NB: ip header may not be in first mbuf */ 704 m_copydata(m, sizeof(struct ether_header) + 705 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 706 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 707 d_wme_ac = TID_TO_WME_AC(tos); 708 } else { 709#endif /* INET */ 710 d_wme_ac = WME_AC_BE; 711#ifdef INET 712 } 713#endif 714 /* 715 * Use highest priority AC. 716 */ 717 if (v_wme_ac > d_wme_ac) 718 ac = v_wme_ac; 719 else 720 ac = d_wme_ac; 721 722 /* 723 * Apply ACM policy. 724 */ 725 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 726 static const int acmap[4] = { 727 WME_AC_BK, /* WME_AC_BE */ 728 WME_AC_BK, /* WME_AC_BK */ 729 WME_AC_BE, /* WME_AC_VI */ 730 WME_AC_VI, /* WME_AC_VO */ 731 }; 732 struct ieee80211com *ic = ni->ni_ic; 733 734 while (ac != WME_AC_BK && 735 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 736 ac = acmap[ac]; 737 } 738done: 739 M_WME_SETAC(m, ac); 740 return 0; 741} 742 743/* 744 * Insure there is sufficient contiguous space to encapsulate the 745 * 802.11 data frame. If room isn't already there, arrange for it. 746 * Drivers and cipher modules assume we have done the necessary work 747 * and fail rudely if they don't find the space they need. 748 */ 749struct mbuf * 750ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 751 struct ieee80211_key *key, struct mbuf *m) 752{ 753#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 754 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 755 756 if (key != NULL) { 757 /* XXX belongs in crypto code? */ 758 needed_space += key->wk_cipher->ic_header; 759 /* XXX frags */ 760 /* 761 * When crypto is being done in the host we must insure 762 * the data are writable for the cipher routines; clone 763 * a writable mbuf chain. 764 * XXX handle SWMIC specially 765 */ 766 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 767 m = m_unshare(m, M_NOWAIT); 768 if (m == NULL) { 769 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 770 "%s: cannot get writable mbuf\n", __func__); 771 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 772 return NULL; 773 } 774 } 775 } 776 /* 777 * We know we are called just before stripping an Ethernet 778 * header and prepending an LLC header. This means we know 779 * there will be 780 * sizeof(struct ether_header) - sizeof(struct llc) 781 * bytes recovered to which we need additional space for the 782 * 802.11 header and any crypto header. 783 */ 784 /* XXX check trailing space and copy instead? */ 785 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 786 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 787 if (n == NULL) { 788 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 789 "%s: cannot expand storage\n", __func__); 790 vap->iv_stats.is_tx_nobuf++; 791 m_freem(m); 792 return NULL; 793 } 794 KASSERT(needed_space <= MHLEN, 795 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 796 /* 797 * Setup new mbuf to have leading space to prepend the 798 * 802.11 header and any crypto header bits that are 799 * required (the latter are added when the driver calls 800 * back to ieee80211_crypto_encap to do crypto encapsulation). 801 */ 802 /* NB: must be first 'cuz it clobbers m_data */ 803 m_move_pkthdr(n, m); 804 n->m_len = 0; /* NB: m_gethdr does not set */ 805 n->m_data += needed_space; 806 /* 807 * Pull up Ethernet header to create the expected layout. 808 * We could use m_pullup but that's overkill (i.e. we don't 809 * need the actual data) and it cannot fail so do it inline 810 * for speed. 811 */ 812 /* NB: struct ether_header is known to be contiguous */ 813 n->m_len += sizeof(struct ether_header); 814 m->m_len -= sizeof(struct ether_header); 815 m->m_data += sizeof(struct ether_header); 816 /* 817 * Replace the head of the chain. 818 */ 819 n->m_next = m; 820 m = n; 821 } 822 return m; 823#undef TO_BE_RECLAIMED 824} 825 826/* 827 * Return the transmit key to use in sending a unicast frame. 828 * If a unicast key is set we use that. When no unicast key is set 829 * we fall back to the default transmit key. 830 */ 831static __inline struct ieee80211_key * 832ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 833 struct ieee80211_node *ni) 834{ 835 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 836 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 837 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 838 return NULL; 839 return &vap->iv_nw_keys[vap->iv_def_txkey]; 840 } else { 841 return &ni->ni_ucastkey; 842 } 843} 844 845/* 846 * Return the transmit key to use in sending a multicast frame. 847 * Multicast traffic always uses the group key which is installed as 848 * the default tx key. 849 */ 850static __inline struct ieee80211_key * 851ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 852 struct ieee80211_node *ni) 853{ 854 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 855 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 856 return NULL; 857 return &vap->iv_nw_keys[vap->iv_def_txkey]; 858} 859 860/* 861 * Encapsulate an outbound data frame. The mbuf chain is updated. 862 * If an error is encountered NULL is returned. The caller is required 863 * to provide a node reference and pullup the ethernet header in the 864 * first mbuf. 865 * 866 * NB: Packet is assumed to be processed by ieee80211_classify which 867 * marked EAPOL frames w/ M_EAPOL. 868 */ 869struct mbuf * 870ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 871 struct mbuf *m) 872{ 873#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 874 struct ieee80211com *ic = ni->ni_ic; 875 struct ether_header eh; 876 struct ieee80211_frame *wh; 877 struct ieee80211_key *key; 878 struct llc *llc; 879 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 880 881 /* 882 * Copy existing Ethernet header to a safe place. The 883 * rest of the code assumes it's ok to strip it when 884 * reorganizing state for the final encapsulation. 885 */ 886 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 887 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 888 889 /* 890 * Insure space for additional headers. First identify 891 * transmit key to use in calculating any buffer adjustments 892 * required. This is also used below to do privacy 893 * encapsulation work. Then calculate the 802.11 header 894 * size and any padding required by the driver. 895 * 896 * Note key may be NULL if we fall back to the default 897 * transmit key and that is not set. In that case the 898 * buffer may not be expanded as needed by the cipher 899 * routines, but they will/should discard it. 900 */ 901 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 902 if (vap->iv_opmode == IEEE80211_M_STA || 903 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 904 (vap->iv_opmode == IEEE80211_M_WDS && 905 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 906 key = ieee80211_crypto_getucastkey(vap, ni); 907 else 908 key = ieee80211_crypto_getmcastkey(vap, ni); 909 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 910 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 911 eh.ether_dhost, 912 "no default transmit key (%s) deftxkey %u", 913 __func__, vap->iv_def_txkey); 914 vap->iv_stats.is_tx_nodefkey++; 915 goto bad; 916 } 917 } else 918 key = NULL; 919 /* 920 * XXX Some ap's don't handle QoS-encapsulated EAPOL 921 * frames so suppress use. This may be an issue if other 922 * ap's require all data frames to be QoS-encapsulated 923 * once negotiated in which case we'll need to make this 924 * configurable. 925 */ 926 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 927 (m->m_flags & M_EAPOL) == 0; 928 if (addqos) 929 hdrsize = sizeof(struct ieee80211_qosframe); 930 else 931 hdrsize = sizeof(struct ieee80211_frame); 932 /* 933 * 4-address frames need to be generated for: 934 * o packets sent through a WDS vap (IEEE80211_M_WDS) 935 * o packets relayed by a station operating with dynamic WDS 936 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 937 */ 938 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 939 (vap->iv_opmode == IEEE80211_M_STA && 940 (vap->iv_flags & IEEE80211_F_DWDS) && 941 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 942 if (is4addr) 943 hdrsize += IEEE80211_ADDR_LEN; 944 /* 945 * Honor driver DATAPAD requirement. 946 */ 947 if (ic->ic_flags & IEEE80211_F_DATAPAD) 948 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 949 else 950 hdrspace = hdrsize; 951 952 if (__predict_true((m->m_flags & M_FF) == 0)) { 953 /* 954 * Normal frame. 955 */ 956 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 957 if (m == NULL) { 958 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 959 goto bad; 960 } 961 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 962 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 963 llc = mtod(m, struct llc *); 964 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 965 llc->llc_control = LLC_UI; 966 llc->llc_snap.org_code[0] = 0; 967 llc->llc_snap.org_code[1] = 0; 968 llc->llc_snap.org_code[2] = 0; 969 llc->llc_snap.ether_type = eh.ether_type; 970 } else { 971#ifdef IEEE80211_SUPPORT_SUPERG 972 /* 973 * Aggregated frame. 974 */ 975 m = ieee80211_ff_encap(vap, m, hdrspace, key); 976 if (m == NULL) 977#endif 978 goto bad; 979 } 980 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 981 982 M_PREPEND(m, hdrspace, M_DONTWAIT); 983 if (m == NULL) { 984 vap->iv_stats.is_tx_nobuf++; 985 goto bad; 986 } 987 wh = mtod(m, struct ieee80211_frame *); 988 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 989 *(uint16_t *)wh->i_dur = 0; 990 if (is4addr) { 991 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 992 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 993 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 994 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 995 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 996 } else switch (vap->iv_opmode) { 997 case IEEE80211_M_STA: 998 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 999 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1000 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1001 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1002 break; 1003 case IEEE80211_M_IBSS: 1004 case IEEE80211_M_AHDEMO: 1005 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1006 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1007 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1008 /* 1009 * NB: always use the bssid from iv_bss as the 1010 * neighbor's may be stale after an ibss merge 1011 */ 1012 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1013 break; 1014 case IEEE80211_M_HOSTAP: 1015 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1016 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1017 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1018 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1019 break; 1020 case IEEE80211_M_MONITOR: 1021 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1022 goto bad; 1023 } 1024 if (m->m_flags & M_MORE_DATA) 1025 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1026 if (addqos) { 1027 uint8_t *qos; 1028 int ac, tid; 1029 1030 if (is4addr) { 1031 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1032 } else 1033 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1034 ac = M_WME_GETAC(m); 1035 /* map from access class/queue to 11e header priorty value */ 1036 tid = WME_AC_TO_TID(ac); 1037 qos[0] = tid & IEEE80211_QOS_TID; 1038 /* 1039 * Check if A-MPDU tx aggregation is setup or if we 1040 * should try to enable it. The sta must be associated 1041 * with HT and A-MPDU enabled for use. When the policy 1042 * routine decides we should enable A-MPDU we issue an 1043 * ADDBA request and wait for a reply. The frame being 1044 * encapsulated will go out w/o using A-MPDU, or possibly 1045 * it might be collected by the driver and held/retransmit. 1046 * The default ic_ampdu_enable routine handles staggering 1047 * ADDBA requests in case the receiver NAK's us or we are 1048 * otherwise unable to establish a BA stream. 1049 */ 1050 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1051 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1052 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1053 1054 ieee80211_txampdu_count_packet(tap); 1055 if (IEEE80211_AMPDU_RUNNING(tap)) { 1056 /* 1057 * Operational, mark frame for aggregation. 1058 * 1059 * NB: We support only immediate BA's for 1060 * AMPDU which means we set the QoS control 1061 * field to "normal ack" (0) to get "implicit 1062 * block ack" behaviour. 1063 */ 1064 m->m_flags |= M_AMPDU_MPDU; 1065 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1066 ic->ic_ampdu_enable(ni, tap)) { 1067 /* 1068 * Not negotiated yet, request service. 1069 */ 1070 ieee80211_ampdu_request(ni, tap); 1071 } 1072 } 1073 /* XXX works even when BA marked above */ 1074 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1075 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1076 qos[1] = 0; 1077 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1078 1079 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1080 /* 1081 * NB: don't assign a sequence # to potential 1082 * aggregates; we expect this happens at the 1083 * point the frame comes off any aggregation q 1084 * as otherwise we may introduce holes in the 1085 * BA sequence space and/or make window accouting 1086 * more difficult. 1087 * 1088 * XXX may want to control this with a driver 1089 * capability; this may also change when we pull 1090 * aggregation up into net80211 1091 */ 1092 *(uint16_t *)wh->i_seq = 1093 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1094 ni->ni_txseqs[tid]++; 1095 } 1096 } else { 1097 *(uint16_t *)wh->i_seq = 1098 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1099 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1100 } 1101 /* check if xmit fragmentation is required */ 1102 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1103 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1104 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1105 (m->m_flags & M_FF) == 0); /* NB: don't fragment ff's */ 1106 if (key != NULL) { 1107 /* 1108 * IEEE 802.1X: send EAPOL frames always in the clear. 1109 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1110 */ 1111 if ((m->m_flags & M_EAPOL) == 0 || 1112 ((vap->iv_flags & IEEE80211_F_WPA) && 1113 (vap->iv_opmode == IEEE80211_M_STA ? 1114 !IEEE80211_KEY_UNDEFINED(key) : 1115 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1116 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1117 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1118 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1119 eh.ether_dhost, 1120 "%s", "enmic failed, discard frame"); 1121 vap->iv_stats.is_crypto_enmicfail++; 1122 goto bad; 1123 } 1124 } 1125 } 1126 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1127 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1128 goto bad; 1129 1130 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1131 1132 IEEE80211_NODE_STAT(ni, tx_data); 1133 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1134 IEEE80211_NODE_STAT(ni, tx_mcast); 1135 else 1136 IEEE80211_NODE_STAT(ni, tx_ucast); 1137 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1138 1139 /* XXX fragmented frames not handled */ 1140 if (bpf_peers_present(vap->iv_rawbpf)) 1141 bpf_mtap(vap->iv_rawbpf, m); 1142 1143 return m; 1144bad: 1145 if (m != NULL) 1146 m_freem(m); 1147 return NULL; 1148#undef WH4 1149} 1150 1151/* 1152 * Fragment the frame according to the specified mtu. 1153 * The size of the 802.11 header (w/o padding) is provided 1154 * so we don't need to recalculate it. We create a new 1155 * mbuf for each fragment and chain it through m_nextpkt; 1156 * we might be able to optimize this by reusing the original 1157 * packet's mbufs but that is significantly more complicated. 1158 */ 1159static int 1160ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1161 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1162{ 1163 struct ieee80211_frame *wh, *whf; 1164 struct mbuf *m, *prev, *next; 1165 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1166 1167 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1168 KASSERT(m0->m_pkthdr.len > mtu, 1169 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1170 1171 wh = mtod(m0, struct ieee80211_frame *); 1172 /* NB: mark the first frag; it will be propagated below */ 1173 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1174 totalhdrsize = hdrsize + ciphdrsize; 1175 fragno = 1; 1176 off = mtu - ciphdrsize; 1177 remainder = m0->m_pkthdr.len - off; 1178 prev = m0; 1179 do { 1180 fragsize = totalhdrsize + remainder; 1181 if (fragsize > mtu) 1182 fragsize = mtu; 1183 /* XXX fragsize can be >2048! */ 1184 KASSERT(fragsize < MCLBYTES, 1185 ("fragment size %u too big!", fragsize)); 1186 if (fragsize > MHLEN) 1187 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1188 else 1189 m = m_gethdr(M_DONTWAIT, MT_DATA); 1190 if (m == NULL) 1191 goto bad; 1192 /* leave room to prepend any cipher header */ 1193 m_align(m, fragsize - ciphdrsize); 1194 1195 /* 1196 * Form the header in the fragment. Note that since 1197 * we mark the first fragment with the MORE_FRAG bit 1198 * it automatically is propagated to each fragment; we 1199 * need only clear it on the last fragment (done below). 1200 */ 1201 whf = mtod(m, struct ieee80211_frame *); 1202 memcpy(whf, wh, hdrsize); 1203 *(uint16_t *)&whf->i_seq[0] |= htole16( 1204 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1205 IEEE80211_SEQ_FRAG_SHIFT); 1206 fragno++; 1207 1208 payload = fragsize - totalhdrsize; 1209 /* NB: destination is known to be contiguous */ 1210 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1211 m->m_len = hdrsize + payload; 1212 m->m_pkthdr.len = hdrsize + payload; 1213 m->m_flags |= M_FRAG; 1214 1215 /* chain up the fragment */ 1216 prev->m_nextpkt = m; 1217 prev = m; 1218 1219 /* deduct fragment just formed */ 1220 remainder -= payload; 1221 off += payload; 1222 } while (remainder != 0); 1223 1224 /* set the last fragment */ 1225 m->m_flags |= M_LASTFRAG; 1226 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1227 1228 /* strip first mbuf now that everything has been copied */ 1229 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1230 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1231 1232 vap->iv_stats.is_tx_fragframes++; 1233 vap->iv_stats.is_tx_frags += fragno-1; 1234 1235 return 1; 1236bad: 1237 /* reclaim fragments but leave original frame for caller to free */ 1238 for (m = m0->m_nextpkt; m != NULL; m = next) { 1239 next = m->m_nextpkt; 1240 m->m_nextpkt = NULL; /* XXX paranoid */ 1241 m_freem(m); 1242 } 1243 m0->m_nextpkt = NULL; 1244 return 0; 1245} 1246 1247/* 1248 * Add a supported rates element id to a frame. 1249 */ 1250static uint8_t * 1251ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1252{ 1253 int nrates; 1254 1255 *frm++ = IEEE80211_ELEMID_RATES; 1256 nrates = rs->rs_nrates; 1257 if (nrates > IEEE80211_RATE_SIZE) 1258 nrates = IEEE80211_RATE_SIZE; 1259 *frm++ = nrates; 1260 memcpy(frm, rs->rs_rates, nrates); 1261 return frm + nrates; 1262} 1263 1264/* 1265 * Add an extended supported rates element id to a frame. 1266 */ 1267static uint8_t * 1268ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1269{ 1270 /* 1271 * Add an extended supported rates element if operating in 11g mode. 1272 */ 1273 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1274 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1275 *frm++ = IEEE80211_ELEMID_XRATES; 1276 *frm++ = nrates; 1277 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1278 frm += nrates; 1279 } 1280 return frm; 1281} 1282 1283/* 1284 * Add an ssid element to a frame. 1285 */ 1286static uint8_t * 1287ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1288{ 1289 *frm++ = IEEE80211_ELEMID_SSID; 1290 *frm++ = len; 1291 memcpy(frm, ssid, len); 1292 return frm + len; 1293} 1294 1295/* 1296 * Add an erp element to a frame. 1297 */ 1298static uint8_t * 1299ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1300{ 1301 uint8_t erp; 1302 1303 *frm++ = IEEE80211_ELEMID_ERP; 1304 *frm++ = 1; 1305 erp = 0; 1306 if (ic->ic_nonerpsta != 0) 1307 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1308 if (ic->ic_flags & IEEE80211_F_USEPROT) 1309 erp |= IEEE80211_ERP_USE_PROTECTION; 1310 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1311 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1312 *frm++ = erp; 1313 return frm; 1314} 1315 1316/* 1317 * Add a CFParams element to a frame. 1318 */ 1319static uint8_t * 1320ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1321{ 1322#define ADDSHORT(frm, v) do { \ 1323 frm[0] = (v) & 0xff; \ 1324 frm[1] = (v) >> 8; \ 1325 frm += 2; \ 1326} while (0) 1327 *frm++ = IEEE80211_ELEMID_CFPARMS; 1328 *frm++ = 6; 1329 *frm++ = 0; /* CFP count */ 1330 *frm++ = 2; /* CFP period */ 1331 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1332 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1333 return frm; 1334#undef ADDSHORT 1335} 1336 1337static __inline uint8_t * 1338add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1339{ 1340 memcpy(frm, ie->ie_data, ie->ie_len); 1341 return frm + ie->ie_len; 1342} 1343 1344static __inline uint8_t * 1345add_ie(uint8_t *frm, const uint8_t *ie) 1346{ 1347 memcpy(frm, ie, 2 + ie[1]); 1348 return frm + 2 + ie[1]; 1349} 1350 1351#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1352/* 1353 * Add a WME information element to a frame. 1354 */ 1355static uint8_t * 1356ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1357{ 1358 static const struct ieee80211_wme_info info = { 1359 .wme_id = IEEE80211_ELEMID_VENDOR, 1360 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1361 .wme_oui = { WME_OUI_BYTES }, 1362 .wme_type = WME_OUI_TYPE, 1363 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1364 .wme_version = WME_VERSION, 1365 .wme_info = 0, 1366 }; 1367 memcpy(frm, &info, sizeof(info)); 1368 return frm + sizeof(info); 1369} 1370 1371/* 1372 * Add a WME parameters element to a frame. 1373 */ 1374static uint8_t * 1375ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1376{ 1377#define SM(_v, _f) (((_v) << _f##_S) & _f) 1378#define ADDSHORT(frm, v) do { \ 1379 frm[0] = (v) & 0xff; \ 1380 frm[1] = (v) >> 8; \ 1381 frm += 2; \ 1382} while (0) 1383 /* NB: this works 'cuz a param has an info at the front */ 1384 static const struct ieee80211_wme_info param = { 1385 .wme_id = IEEE80211_ELEMID_VENDOR, 1386 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1387 .wme_oui = { WME_OUI_BYTES }, 1388 .wme_type = WME_OUI_TYPE, 1389 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1390 .wme_version = WME_VERSION, 1391 }; 1392 int i; 1393 1394 memcpy(frm, ¶m, sizeof(param)); 1395 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1396 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1397 *frm++ = 0; /* reserved field */ 1398 for (i = 0; i < WME_NUM_AC; i++) { 1399 const struct wmeParams *ac = 1400 &wme->wme_bssChanParams.cap_wmeParams[i]; 1401 *frm++ = SM(i, WME_PARAM_ACI) 1402 | SM(ac->wmep_acm, WME_PARAM_ACM) 1403 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1404 ; 1405 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1406 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1407 ; 1408 ADDSHORT(frm, ac->wmep_txopLimit); 1409 } 1410 return frm; 1411#undef SM 1412#undef ADDSHORT 1413} 1414#undef WME_OUI_BYTES 1415 1416/* 1417 * Add an 11h Power Constraint element to a frame. 1418 */ 1419static uint8_t * 1420ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1421{ 1422 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1423 /* XXX per-vap tx power limit? */ 1424 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1425 1426 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1427 frm[1] = 1; 1428 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1429 return frm + 3; 1430} 1431 1432/* 1433 * Add an 11h Power Capability element to a frame. 1434 */ 1435static uint8_t * 1436ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1437{ 1438 frm[0] = IEEE80211_ELEMID_PWRCAP; 1439 frm[1] = 2; 1440 frm[2] = c->ic_minpower; 1441 frm[3] = c->ic_maxpower; 1442 return frm + 4; 1443} 1444 1445/* 1446 * Add an 11h Supported Channels element to a frame. 1447 */ 1448static uint8_t * 1449ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1450{ 1451 static const int ielen = 26; 1452 1453 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1454 frm[1] = ielen; 1455 /* XXX not correct */ 1456 memcpy(frm+2, ic->ic_chan_avail, ielen); 1457 return frm + 2 + ielen; 1458} 1459 1460/* 1461 * Add an 11h Channel Switch Announcement element to a frame. 1462 * Note that we use the per-vap CSA count to adjust the global 1463 * counter so we can use this routine to form probe response 1464 * frames and get the current count. 1465 */ 1466static uint8_t * 1467ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1468{ 1469 struct ieee80211com *ic = vap->iv_ic; 1470 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1471 1472 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1473 csa->csa_len = 3; 1474 csa->csa_mode = 1; /* XXX force quiet on channel */ 1475 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1476 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1477 return frm + sizeof(*csa); 1478} 1479 1480/* 1481 * Add an 11h country information element to a frame. 1482 */ 1483static uint8_t * 1484ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1485{ 1486 1487 if (ic->ic_countryie == NULL || 1488 ic->ic_countryie_chan != ic->ic_bsschan) { 1489 /* 1490 * Handle lazy construction of ie. This is done on 1491 * first use and after a channel change that requires 1492 * re-calculation. 1493 */ 1494 if (ic->ic_countryie != NULL) 1495 free(ic->ic_countryie, M_80211_NODE_IE); 1496 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1497 if (ic->ic_countryie == NULL) 1498 return frm; 1499 ic->ic_countryie_chan = ic->ic_bsschan; 1500 } 1501 return add_appie(frm, ic->ic_countryie); 1502} 1503 1504/* 1505 * Send a probe request frame with the specified ssid 1506 * and any optional information element data. 1507 */ 1508int 1509ieee80211_send_probereq(struct ieee80211_node *ni, 1510 const uint8_t sa[IEEE80211_ADDR_LEN], 1511 const uint8_t da[IEEE80211_ADDR_LEN], 1512 const uint8_t bssid[IEEE80211_ADDR_LEN], 1513 const uint8_t *ssid, size_t ssidlen) 1514{ 1515 struct ieee80211vap *vap = ni->ni_vap; 1516 struct ieee80211com *ic = ni->ni_ic; 1517 const struct ieee80211_txparam *tp; 1518 struct ieee80211_bpf_params params; 1519 struct ieee80211_frame *wh; 1520 const struct ieee80211_rateset *rs; 1521 struct mbuf *m; 1522 uint8_t *frm; 1523 1524 if (vap->iv_state == IEEE80211_S_CAC) { 1525 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1526 "block %s frame in CAC state", "probe request"); 1527 vap->iv_stats.is_tx_badstate++; 1528 return EIO; /* XXX */ 1529 } 1530 1531 /* 1532 * Hold a reference on the node so it doesn't go away until after 1533 * the xmit is complete all the way in the driver. On error we 1534 * will remove our reference. 1535 */ 1536 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1537 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1538 __func__, __LINE__, 1539 ni, ether_sprintf(ni->ni_macaddr), 1540 ieee80211_node_refcnt(ni)+1); 1541 ieee80211_ref_node(ni); 1542 1543 /* 1544 * prreq frame format 1545 * [tlv] ssid 1546 * [tlv] supported rates 1547 * [tlv] RSN (optional) 1548 * [tlv] extended supported rates 1549 * [tlv] WPA (optional) 1550 * [tlv] user-specified ie's 1551 */ 1552 m = ieee80211_getmgtframe(&frm, 1553 ic->ic_headroom + sizeof(struct ieee80211_frame), 1554 2 + IEEE80211_NWID_LEN 1555 + 2 + IEEE80211_RATE_SIZE 1556 + sizeof(struct ieee80211_ie_wpa) 1557 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1558 + sizeof(struct ieee80211_ie_wpa) 1559 + (vap->iv_appie_probereq != NULL ? 1560 vap->iv_appie_probereq->ie_len : 0) 1561 ); 1562 if (m == NULL) { 1563 vap->iv_stats.is_tx_nobuf++; 1564 ieee80211_free_node(ni); 1565 return ENOMEM; 1566 } 1567 1568 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1569 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1570 frm = ieee80211_add_rates(frm, rs); 1571 if (vap->iv_flags & IEEE80211_F_WPA2) { 1572 if (vap->iv_rsn_ie != NULL) 1573 frm = add_ie(frm, vap->iv_rsn_ie); 1574 /* XXX else complain? */ 1575 } 1576 frm = ieee80211_add_xrates(frm, rs); 1577 if (vap->iv_flags & IEEE80211_F_WPA1) { 1578 if (vap->iv_wpa_ie != NULL) 1579 frm = add_ie(frm, vap->iv_wpa_ie); 1580 /* XXX else complain? */ 1581 } 1582 if (vap->iv_appie_probereq != NULL) 1583 frm = add_appie(frm, vap->iv_appie_probereq); 1584 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1585 1586 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1587 ("leading space %zd", M_LEADINGSPACE(m))); 1588 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1589 if (m == NULL) { 1590 /* NB: cannot happen */ 1591 ieee80211_free_node(ni); 1592 return ENOMEM; 1593 } 1594 1595 wh = mtod(m, struct ieee80211_frame *); 1596 ieee80211_send_setup(ni, wh, 1597 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1598 IEEE80211_NONQOS_TID, sa, da, bssid); 1599 /* XXX power management? */ 1600 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1601 1602 M_WME_SETAC(m, WME_AC_BE); 1603 1604 IEEE80211_NODE_STAT(ni, tx_probereq); 1605 IEEE80211_NODE_STAT(ni, tx_mgmt); 1606 1607 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1608 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1609 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1610 ssidlen, ssid); 1611 1612 memset(¶ms, 0, sizeof(params)); 1613 params.ibp_pri = M_WME_GETAC(m); 1614 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1615 params.ibp_rate0 = tp->mgmtrate; 1616 if (IEEE80211_IS_MULTICAST(da)) { 1617 params.ibp_flags |= IEEE80211_BPF_NOACK; 1618 params.ibp_try0 = 1; 1619 } else 1620 params.ibp_try0 = tp->maxretry; 1621 params.ibp_power = ni->ni_txpower; 1622 return ic->ic_raw_xmit(ni, m, ¶ms); 1623} 1624 1625/* 1626 * Calculate capability information for mgt frames. 1627 */ 1628static uint16_t 1629getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1630{ 1631 struct ieee80211com *ic = vap->iv_ic; 1632 uint16_t capinfo; 1633 1634 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1635 1636 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1637 capinfo = IEEE80211_CAPINFO_ESS; 1638 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1639 capinfo = IEEE80211_CAPINFO_IBSS; 1640 else 1641 capinfo = 0; 1642 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1643 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1644 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1645 IEEE80211_IS_CHAN_2GHZ(chan)) 1646 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1647 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1648 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1649 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1650 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1651 return capinfo; 1652} 1653 1654/* 1655 * Send a management frame. The node is for the destination (or ic_bss 1656 * when in station mode). Nodes other than ic_bss have their reference 1657 * count bumped to reflect our use for an indeterminant time. 1658 */ 1659int 1660ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1661{ 1662#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1663#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1664 struct ieee80211vap *vap = ni->ni_vap; 1665 struct ieee80211com *ic = ni->ni_ic; 1666 struct ieee80211_node *bss = vap->iv_bss; 1667 struct ieee80211_bpf_params params; 1668 struct mbuf *m; 1669 uint8_t *frm; 1670 uint16_t capinfo; 1671 int has_challenge, is_shared_key, ret, status; 1672 1673 KASSERT(ni != NULL, ("null node")); 1674 1675 /* 1676 * Hold a reference on the node so it doesn't go away until after 1677 * the xmit is complete all the way in the driver. On error we 1678 * will remove our reference. 1679 */ 1680 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1681 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1682 __func__, __LINE__, 1683 ni, ether_sprintf(ni->ni_macaddr), 1684 ieee80211_node_refcnt(ni)+1); 1685 ieee80211_ref_node(ni); 1686 1687 memset(¶ms, 0, sizeof(params)); 1688 switch (type) { 1689 1690 case IEEE80211_FC0_SUBTYPE_AUTH: 1691 status = arg >> 16; 1692 arg &= 0xffff; 1693 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1694 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1695 ni->ni_challenge != NULL); 1696 1697 /* 1698 * Deduce whether we're doing open authentication or 1699 * shared key authentication. We do the latter if 1700 * we're in the middle of a shared key authentication 1701 * handshake or if we're initiating an authentication 1702 * request and configured to use shared key. 1703 */ 1704 is_shared_key = has_challenge || 1705 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1706 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1707 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1708 1709 m = ieee80211_getmgtframe(&frm, 1710 ic->ic_headroom + sizeof(struct ieee80211_frame), 1711 3 * sizeof(uint16_t) 1712 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1713 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1714 ); 1715 if (m == NULL) 1716 senderr(ENOMEM, is_tx_nobuf); 1717 1718 ((uint16_t *)frm)[0] = 1719 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1720 : htole16(IEEE80211_AUTH_ALG_OPEN); 1721 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1722 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1723 1724 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1725 ((uint16_t *)frm)[3] = 1726 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1727 IEEE80211_ELEMID_CHALLENGE); 1728 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1729 IEEE80211_CHALLENGE_LEN); 1730 m->m_pkthdr.len = m->m_len = 1731 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1732 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1733 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1734 "request encrypt frame (%s)", __func__); 1735 /* mark frame for encryption */ 1736 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1737 } 1738 } else 1739 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1740 1741 /* XXX not right for shared key */ 1742 if (status == IEEE80211_STATUS_SUCCESS) 1743 IEEE80211_NODE_STAT(ni, tx_auth); 1744 else 1745 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1746 1747 if (vap->iv_opmode == IEEE80211_M_STA) 1748 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1749 (void *) vap->iv_state); 1750 break; 1751 1752 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1753 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1754 "send station deauthenticate (reason %d)", arg); 1755 m = ieee80211_getmgtframe(&frm, 1756 ic->ic_headroom + sizeof(struct ieee80211_frame), 1757 sizeof(uint16_t)); 1758 if (m == NULL) 1759 senderr(ENOMEM, is_tx_nobuf); 1760 *(uint16_t *)frm = htole16(arg); /* reason */ 1761 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1762 1763 IEEE80211_NODE_STAT(ni, tx_deauth); 1764 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1765 1766 ieee80211_node_unauthorize(ni); /* port closed */ 1767 break; 1768 1769 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1770 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1771 /* 1772 * asreq frame format 1773 * [2] capability information 1774 * [2] listen interval 1775 * [6*] current AP address (reassoc only) 1776 * [tlv] ssid 1777 * [tlv] supported rates 1778 * [tlv] extended supported rates 1779 * [4] power capability (optional) 1780 * [28] supported channels (optional) 1781 * [tlv] HT capabilities 1782 * [tlv] WME (optional) 1783 * [tlv] Vendor OUI HT capabilities (optional) 1784 * [tlv] Atheros capabilities (if negotiated) 1785 * [tlv] AppIE's (optional) 1786 */ 1787 m = ieee80211_getmgtframe(&frm, 1788 ic->ic_headroom + sizeof(struct ieee80211_frame), 1789 sizeof(uint16_t) 1790 + sizeof(uint16_t) 1791 + IEEE80211_ADDR_LEN 1792 + 2 + IEEE80211_NWID_LEN 1793 + 2 + IEEE80211_RATE_SIZE 1794 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1795 + 4 1796 + 2 + 26 1797 + sizeof(struct ieee80211_wme_info) 1798 + sizeof(struct ieee80211_ie_htcap) 1799 + 4 + sizeof(struct ieee80211_ie_htcap) 1800#ifdef IEEE80211_SUPPORT_SUPERG 1801 + sizeof(struct ieee80211_ath_ie) 1802#endif 1803 + (vap->iv_appie_wpa != NULL ? 1804 vap->iv_appie_wpa->ie_len : 0) 1805 + (vap->iv_appie_assocreq != NULL ? 1806 vap->iv_appie_assocreq->ie_len : 0) 1807 ); 1808 if (m == NULL) 1809 senderr(ENOMEM, is_tx_nobuf); 1810 1811 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1812 ("wrong mode %u", vap->iv_opmode)); 1813 capinfo = IEEE80211_CAPINFO_ESS; 1814 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1815 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1816 /* 1817 * NB: Some 11a AP's reject the request when 1818 * short premable is set. 1819 */ 1820 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1821 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1822 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1823 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1824 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1825 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1826 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1827 (vap->iv_flags & IEEE80211_F_DOTH)) 1828 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1829 *(uint16_t *)frm = htole16(capinfo); 1830 frm += 2; 1831 1832 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1833 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1834 bss->ni_intval)); 1835 frm += 2; 1836 1837 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1838 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1839 frm += IEEE80211_ADDR_LEN; 1840 } 1841 1842 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1843 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1844 if (vap->iv_flags & IEEE80211_F_WPA2) { 1845 if (vap->iv_rsn_ie != NULL) 1846 frm = add_ie(frm, vap->iv_rsn_ie); 1847 /* XXX else complain? */ 1848 } 1849 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1850 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1851 frm = ieee80211_add_powercapability(frm, 1852 ic->ic_curchan); 1853 frm = ieee80211_add_supportedchannels(frm, ic); 1854 } 1855 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1856 ni->ni_ies.htcap_ie != NULL && 1857 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1858 frm = ieee80211_add_htcap(frm, ni); 1859 if (vap->iv_flags & IEEE80211_F_WPA1) { 1860 if (vap->iv_wpa_ie != NULL) 1861 frm = add_ie(frm, vap->iv_wpa_ie); 1862 /* XXX else complain */ 1863 } 1864 if ((ic->ic_flags & IEEE80211_F_WME) && 1865 ni->ni_ies.wme_ie != NULL) 1866 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1867 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1868 ni->ni_ies.htcap_ie != NULL && 1869 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1870 frm = ieee80211_add_htcap_vendor(frm, ni); 1871#ifdef IEEE80211_SUPPORT_SUPERG 1872 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1873 frm = ieee80211_add_ath(frm, 1874 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1875 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1876 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1877 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1878 } 1879#endif /* IEEE80211_SUPPORT_SUPERG */ 1880 if (vap->iv_appie_assocreq != NULL) 1881 frm = add_appie(frm, vap->iv_appie_assocreq); 1882 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1883 1884 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1885 (void *) vap->iv_state); 1886 break; 1887 1888 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1889 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1890 /* 1891 * asresp frame format 1892 * [2] capability information 1893 * [2] status 1894 * [2] association ID 1895 * [tlv] supported rates 1896 * [tlv] extended supported rates 1897 * [tlv] HT capabilities (standard, if STA enabled) 1898 * [tlv] HT information (standard, if STA enabled) 1899 * [tlv] WME (if configured and STA enabled) 1900 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1901 * [tlv] HT information (vendor OUI, if STA enabled) 1902 * [tlv] Atheros capabilities (if STA enabled) 1903 * [tlv] AppIE's (optional) 1904 */ 1905 m = ieee80211_getmgtframe(&frm, 1906 ic->ic_headroom + sizeof(struct ieee80211_frame), 1907 sizeof(uint16_t) 1908 + sizeof(uint16_t) 1909 + sizeof(uint16_t) 1910 + 2 + IEEE80211_RATE_SIZE 1911 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1912 + sizeof(struct ieee80211_ie_htcap) + 4 1913 + sizeof(struct ieee80211_ie_htinfo) + 4 1914 + sizeof(struct ieee80211_wme_param) 1915#ifdef IEEE80211_SUPPORT_SUPERG 1916 + sizeof(struct ieee80211_ath_ie) 1917#endif 1918 + (vap->iv_appie_assocresp != NULL ? 1919 vap->iv_appie_assocresp->ie_len : 0) 1920 ); 1921 if (m == NULL) 1922 senderr(ENOMEM, is_tx_nobuf); 1923 1924 capinfo = getcapinfo(vap, bss->ni_chan); 1925 *(uint16_t *)frm = htole16(capinfo); 1926 frm += 2; 1927 1928 *(uint16_t *)frm = htole16(arg); /* status */ 1929 frm += 2; 1930 1931 if (arg == IEEE80211_STATUS_SUCCESS) { 1932 *(uint16_t *)frm = htole16(ni->ni_associd); 1933 IEEE80211_NODE_STAT(ni, tx_assoc); 1934 } else 1935 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1936 frm += 2; 1937 1938 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1939 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1940 /* NB: respond according to what we received */ 1941 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1942 frm = ieee80211_add_htcap(frm, ni); 1943 frm = ieee80211_add_htinfo(frm, ni); 1944 } 1945 if ((vap->iv_flags & IEEE80211_F_WME) && 1946 ni->ni_ies.wme_ie != NULL) 1947 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1948 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1949 frm = ieee80211_add_htcap_vendor(frm, ni); 1950 frm = ieee80211_add_htinfo_vendor(frm, ni); 1951 } 1952#ifdef IEEE80211_SUPPORT_SUPERG 1953 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1954 frm = ieee80211_add_ath(frm, 1955 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1956 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1957 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1958 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1959#endif /* IEEE80211_SUPPORT_SUPERG */ 1960 if (vap->iv_appie_assocresp != NULL) 1961 frm = add_appie(frm, vap->iv_appie_assocresp); 1962 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1963 break; 1964 1965 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1966 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1967 "send station disassociate (reason %d)", arg); 1968 m = ieee80211_getmgtframe(&frm, 1969 ic->ic_headroom + sizeof(struct ieee80211_frame), 1970 sizeof(uint16_t)); 1971 if (m == NULL) 1972 senderr(ENOMEM, is_tx_nobuf); 1973 *(uint16_t *)frm = htole16(arg); /* reason */ 1974 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1975 1976 IEEE80211_NODE_STAT(ni, tx_disassoc); 1977 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1978 break; 1979 1980 default: 1981 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1982 "invalid mgmt frame type %u", type); 1983 senderr(EINVAL, is_tx_unknownmgt); 1984 /* NOTREACHED */ 1985 } 1986 1987 /* NB: force non-ProbeResp frames to the highest queue */ 1988 params.ibp_pri = WME_AC_VO; 1989 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1990 /* NB: we know all frames are unicast */ 1991 params.ibp_try0 = bss->ni_txparms->maxretry; 1992 params.ibp_power = bss->ni_txpower; 1993 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1994bad: 1995 ieee80211_free_node(ni); 1996 return ret; 1997#undef senderr 1998#undef HTFLAGS 1999} 2000 2001/* 2002 * Return an mbuf with a probe response frame in it. 2003 * Space is left to prepend and 802.11 header at the 2004 * front but it's left to the caller to fill in. 2005 */ 2006struct mbuf * 2007ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2008{ 2009 struct ieee80211vap *vap = bss->ni_vap; 2010 struct ieee80211com *ic = bss->ni_ic; 2011 const struct ieee80211_rateset *rs; 2012 struct mbuf *m; 2013 uint16_t capinfo; 2014 uint8_t *frm; 2015 2016 /* 2017 * probe response frame format 2018 * [8] time stamp 2019 * [2] beacon interval 2020 * [2] cabability information 2021 * [tlv] ssid 2022 * [tlv] supported rates 2023 * [tlv] parameter set (FH/DS) 2024 * [tlv] parameter set (IBSS) 2025 * [tlv] country (optional) 2026 * [3] power control (optional) 2027 * [5] channel switch announcement (CSA) (optional) 2028 * [tlv] extended rate phy (ERP) 2029 * [tlv] extended supported rates 2030 * [tlv] RSN (optional) 2031 * [tlv] HT capabilities 2032 * [tlv] HT information 2033 * [tlv] WPA (optional) 2034 * [tlv] WME (optional) 2035 * [tlv] Vendor OUI HT capabilities (optional) 2036 * [tlv] Vendor OUI HT information (optional) 2037 * [tlv] Atheros capabilities 2038 * [tlv] AppIE's (optional) 2039 */ 2040 m = ieee80211_getmgtframe(&frm, 2041 ic->ic_headroom + sizeof(struct ieee80211_frame), 2042 8 2043 + sizeof(uint16_t) 2044 + sizeof(uint16_t) 2045 + 2 + IEEE80211_NWID_LEN 2046 + 2 + IEEE80211_RATE_SIZE 2047 + 7 /* max(7,3) */ 2048 + IEEE80211_COUNTRY_MAX_SIZE 2049 + 3 2050 + sizeof(struct ieee80211_csa_ie) 2051 + 3 2052 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2053 + sizeof(struct ieee80211_ie_wpa) 2054 + sizeof(struct ieee80211_ie_htcap) 2055 + sizeof(struct ieee80211_ie_htinfo) 2056 + sizeof(struct ieee80211_ie_wpa) 2057 + sizeof(struct ieee80211_wme_param) 2058 + 4 + sizeof(struct ieee80211_ie_htcap) 2059 + 4 + sizeof(struct ieee80211_ie_htinfo) 2060#ifdef IEEE80211_SUPPORT_SUPERG 2061 + sizeof(struct ieee80211_ath_ie) 2062#endif 2063 + (vap->iv_appie_proberesp != NULL ? 2064 vap->iv_appie_proberesp->ie_len : 0) 2065 ); 2066 if (m == NULL) { 2067 vap->iv_stats.is_tx_nobuf++; 2068 return NULL; 2069 } 2070 2071 memset(frm, 0, 8); /* timestamp should be filled later */ 2072 frm += 8; 2073 *(uint16_t *)frm = htole16(bss->ni_intval); 2074 frm += 2; 2075 capinfo = getcapinfo(vap, bss->ni_chan); 2076 *(uint16_t *)frm = htole16(capinfo); 2077 frm += 2; 2078 2079 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2080 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2081 frm = ieee80211_add_rates(frm, rs); 2082 2083 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2084 *frm++ = IEEE80211_ELEMID_FHPARMS; 2085 *frm++ = 5; 2086 *frm++ = bss->ni_fhdwell & 0x00ff; 2087 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2088 *frm++ = IEEE80211_FH_CHANSET( 2089 ieee80211_chan2ieee(ic, bss->ni_chan)); 2090 *frm++ = IEEE80211_FH_CHANPAT( 2091 ieee80211_chan2ieee(ic, bss->ni_chan)); 2092 *frm++ = bss->ni_fhindex; 2093 } else { 2094 *frm++ = IEEE80211_ELEMID_DSPARMS; 2095 *frm++ = 1; 2096 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2097 } 2098 2099 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2100 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2101 *frm++ = 2; 2102 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2103 } 2104 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2105 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2106 frm = ieee80211_add_countryie(frm, ic); 2107 if (vap->iv_flags & IEEE80211_F_DOTH) { 2108 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2109 frm = ieee80211_add_powerconstraint(frm, vap); 2110 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2111 frm = ieee80211_add_csa(frm, vap); 2112 } 2113 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2114 frm = ieee80211_add_erp(frm, ic); 2115 frm = ieee80211_add_xrates(frm, rs); 2116 if (vap->iv_flags & IEEE80211_F_WPA2) { 2117 if (vap->iv_rsn_ie != NULL) 2118 frm = add_ie(frm, vap->iv_rsn_ie); 2119 /* XXX else complain? */ 2120 } 2121 /* 2122 * NB: legacy 11b clients do not get certain ie's. 2123 * The caller identifies such clients by passing 2124 * a token in legacy to us. Could expand this to be 2125 * any legacy client for stuff like HT ie's. 2126 */ 2127 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2128 legacy != IEEE80211_SEND_LEGACY_11B) { 2129 frm = ieee80211_add_htcap(frm, bss); 2130 frm = ieee80211_add_htinfo(frm, bss); 2131 } 2132 if (vap->iv_flags & IEEE80211_F_WPA1) { 2133 if (vap->iv_wpa_ie != NULL) 2134 frm = add_ie(frm, vap->iv_wpa_ie); 2135 /* XXX else complain? */ 2136 } 2137 if (vap->iv_flags & IEEE80211_F_WME) 2138 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2139 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2140 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2141 legacy != IEEE80211_SEND_LEGACY_11B) { 2142 frm = ieee80211_add_htcap_vendor(frm, bss); 2143 frm = ieee80211_add_htinfo_vendor(frm, bss); 2144 } 2145#ifdef IEEE80211_SUPPORT_SUPERG 2146 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2147 legacy != IEEE80211_SEND_LEGACY_11B) 2148 frm = ieee80211_add_athcaps(frm, bss); 2149#endif 2150 if (vap->iv_appie_proberesp != NULL) 2151 frm = add_appie(frm, vap->iv_appie_proberesp); 2152 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2153 2154 return m; 2155} 2156 2157/* 2158 * Send a probe response frame to the specified mac address. 2159 * This does not go through the normal mgt frame api so we 2160 * can specify the destination address and re-use the bss node 2161 * for the sta reference. 2162 */ 2163int 2164ieee80211_send_proberesp(struct ieee80211vap *vap, 2165 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2166{ 2167 struct ieee80211_node *bss = vap->iv_bss; 2168 struct ieee80211com *ic = vap->iv_ic; 2169 struct ieee80211_frame *wh; 2170 struct mbuf *m; 2171 2172 if (vap->iv_state == IEEE80211_S_CAC) { 2173 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2174 "block %s frame in CAC state", "probe response"); 2175 vap->iv_stats.is_tx_badstate++; 2176 return EIO; /* XXX */ 2177 } 2178 2179 /* 2180 * Hold a reference on the node so it doesn't go away until after 2181 * the xmit is complete all the way in the driver. On error we 2182 * will remove our reference. 2183 */ 2184 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2185 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2186 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2187 ieee80211_node_refcnt(bss)+1); 2188 ieee80211_ref_node(bss); 2189 2190 m = ieee80211_alloc_proberesp(bss, legacy); 2191 if (m == NULL) { 2192 ieee80211_free_node(bss); 2193 return ENOMEM; 2194 } 2195 2196 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2197 KASSERT(m != NULL, ("no room for header")); 2198 2199 wh = mtod(m, struct ieee80211_frame *); 2200 ieee80211_send_setup(bss, wh, 2201 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2202 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2203 /* XXX power management? */ 2204 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2205 2206 M_WME_SETAC(m, WME_AC_BE); 2207 2208 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2209 "send probe resp on channel %u to %s%s\n", 2210 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2211 legacy ? " <legacy>" : ""); 2212 IEEE80211_NODE_STAT(bss, tx_mgmt); 2213 2214 return ic->ic_raw_xmit(bss, m, NULL); 2215} 2216 2217/* 2218 * Allocate and build a RTS (Request To Send) control frame. 2219 */ 2220struct mbuf * 2221ieee80211_alloc_rts(struct ieee80211com *ic, 2222 const uint8_t ra[IEEE80211_ADDR_LEN], 2223 const uint8_t ta[IEEE80211_ADDR_LEN], 2224 uint16_t dur) 2225{ 2226 struct ieee80211_frame_rts *rts; 2227 struct mbuf *m; 2228 2229 /* XXX honor ic_headroom */ 2230 m = m_gethdr(M_DONTWAIT, MT_DATA); 2231 if (m != NULL) { 2232 rts = mtod(m, struct ieee80211_frame_rts *); 2233 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2234 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2235 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2236 *(u_int16_t *)rts->i_dur = htole16(dur); 2237 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2238 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2239 2240 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2241 } 2242 return m; 2243} 2244 2245/* 2246 * Allocate and build a CTS (Clear To Send) control frame. 2247 */ 2248struct mbuf * 2249ieee80211_alloc_cts(struct ieee80211com *ic, 2250 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2251{ 2252 struct ieee80211_frame_cts *cts; 2253 struct mbuf *m; 2254 2255 /* XXX honor ic_headroom */ 2256 m = m_gethdr(M_DONTWAIT, MT_DATA); 2257 if (m != NULL) { 2258 cts = mtod(m, struct ieee80211_frame_cts *); 2259 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2260 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2261 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2262 *(u_int16_t *)cts->i_dur = htole16(dur); 2263 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2264 2265 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2266 } 2267 return m; 2268} 2269 2270static void 2271ieee80211_tx_mgt_timeout(void *arg) 2272{ 2273 struct ieee80211_node *ni = arg; 2274 struct ieee80211vap *vap = ni->ni_vap; 2275 2276 if (vap->iv_state != IEEE80211_S_INIT && 2277 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2278 /* 2279 * NB: it's safe to specify a timeout as the reason here; 2280 * it'll only be used in the right state. 2281 */ 2282 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2283 IEEE80211_SCAN_FAIL_TIMEOUT); 2284 } 2285} 2286 2287static void 2288ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2289{ 2290 struct ieee80211vap *vap = ni->ni_vap; 2291 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2292 2293 /* 2294 * Frame transmit completed; arrange timer callback. If 2295 * transmit was successfuly we wait for response. Otherwise 2296 * we arrange an immediate callback instead of doing the 2297 * callback directly since we don't know what state the driver 2298 * is in (e.g. what locks it is holding). This work should 2299 * not be too time-critical and not happen too often so the 2300 * added overhead is acceptable. 2301 * 2302 * XXX what happens if !acked but response shows up before callback? 2303 */ 2304 if (vap->iv_state == ostate) 2305 callout_reset(&vap->iv_mgtsend, 2306 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2307 ieee80211_tx_mgt_timeout, ni); 2308} 2309 2310static void 2311ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2312 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2313{ 2314 struct ieee80211vap *vap = ni->ni_vap; 2315 struct ieee80211com *ic = ni->ni_ic; 2316 struct ieee80211_rateset *rs = &ni->ni_rates; 2317 uint16_t capinfo; 2318 2319 /* 2320 * beacon frame format 2321 * [8] time stamp 2322 * [2] beacon interval 2323 * [2] cabability information 2324 * [tlv] ssid 2325 * [tlv] supported rates 2326 * [3] parameter set (DS) 2327 * [8] CF parameter set (optional) 2328 * [tlv] parameter set (IBSS/TIM) 2329 * [tlv] country (optional) 2330 * [3] power control (optional) 2331 * [5] channel switch announcement (CSA) (optional) 2332 * [tlv] extended rate phy (ERP) 2333 * [tlv] extended supported rates 2334 * [tlv] RSN parameters 2335 * [tlv] HT capabilities 2336 * [tlv] HT information 2337 * XXX Vendor-specific OIDs (e.g. Atheros) 2338 * [tlv] WPA parameters 2339 * [tlv] WME parameters 2340 * [tlv] Vendor OUI HT capabilities (optional) 2341 * [tlv] Vendor OUI HT information (optional) 2342 * [tlv] Atheros capabilities (optional) 2343 * [tlv] TDMA parameters (optional) 2344 * [tlv] application data (optional) 2345 */ 2346 2347 memset(bo, 0, sizeof(*bo)); 2348 2349 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2350 frm += 8; 2351 *(uint16_t *)frm = htole16(ni->ni_intval); 2352 frm += 2; 2353 capinfo = getcapinfo(vap, ni->ni_chan); 2354 bo->bo_caps = (uint16_t *)frm; 2355 *(uint16_t *)frm = htole16(capinfo); 2356 frm += 2; 2357 *frm++ = IEEE80211_ELEMID_SSID; 2358 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2359 *frm++ = ni->ni_esslen; 2360 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2361 frm += ni->ni_esslen; 2362 } else 2363 *frm++ = 0; 2364 frm = ieee80211_add_rates(frm, rs); 2365 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2366 *frm++ = IEEE80211_ELEMID_DSPARMS; 2367 *frm++ = 1; 2368 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2369 } 2370 if (ic->ic_flags & IEEE80211_F_PCF) { 2371 bo->bo_cfp = frm; 2372 frm = ieee80211_add_cfparms(frm, ic); 2373 } 2374 bo->bo_tim = frm; 2375 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2376 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2377 *frm++ = 2; 2378 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2379 bo->bo_tim_len = 0; 2380 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2381 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2382 2383 tie->tim_ie = IEEE80211_ELEMID_TIM; 2384 tie->tim_len = 4; /* length */ 2385 tie->tim_count = 0; /* DTIM count */ 2386 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2387 tie->tim_bitctl = 0; /* bitmap control */ 2388 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2389 frm += sizeof(struct ieee80211_tim_ie); 2390 bo->bo_tim_len = 1; 2391 } 2392 bo->bo_tim_trailer = frm; 2393 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2394 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2395 frm = ieee80211_add_countryie(frm, ic); 2396 if (vap->iv_flags & IEEE80211_F_DOTH) { 2397 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2398 frm = ieee80211_add_powerconstraint(frm, vap); 2399 bo->bo_csa = frm; 2400 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2401 frm = ieee80211_add_csa(frm, vap); 2402 } else 2403 bo->bo_csa = frm; 2404 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2405 bo->bo_erp = frm; 2406 frm = ieee80211_add_erp(frm, ic); 2407 } 2408 frm = ieee80211_add_xrates(frm, rs); 2409 if (vap->iv_flags & IEEE80211_F_WPA2) { 2410 if (vap->iv_rsn_ie != NULL) 2411 frm = add_ie(frm, vap->iv_rsn_ie); 2412 /* XXX else complain */ 2413 } 2414 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2415 frm = ieee80211_add_htcap(frm, ni); 2416 bo->bo_htinfo = frm; 2417 frm = ieee80211_add_htinfo(frm, ni); 2418 } 2419 if (vap->iv_flags & IEEE80211_F_WPA1) { 2420 if (vap->iv_wpa_ie != NULL) 2421 frm = add_ie(frm, vap->iv_wpa_ie); 2422 /* XXX else complain */ 2423 } 2424 if (vap->iv_flags & IEEE80211_F_WME) { 2425 bo->bo_wme = frm; 2426 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2427 } 2428 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2429 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2430 frm = ieee80211_add_htcap_vendor(frm, ni); 2431 frm = ieee80211_add_htinfo_vendor(frm, ni); 2432 } 2433#ifdef IEEE80211_SUPPORT_SUPERG 2434 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2435 bo->bo_ath = frm; 2436 frm = ieee80211_add_athcaps(frm, ni); 2437 } 2438#endif 2439#ifdef IEEE80211_SUPPORT_TDMA 2440 if (vap->iv_caps & IEEE80211_C_TDMA) { 2441 bo->bo_tdma = frm; 2442 frm = ieee80211_add_tdma(frm, vap); 2443 } 2444#endif 2445 if (vap->iv_appie_beacon != NULL) { 2446 bo->bo_appie = frm; 2447 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2448 frm = add_appie(frm, vap->iv_appie_beacon); 2449 } 2450 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2451 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2452 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2453} 2454 2455/* 2456 * Allocate a beacon frame and fillin the appropriate bits. 2457 */ 2458struct mbuf * 2459ieee80211_beacon_alloc(struct ieee80211_node *ni, 2460 struct ieee80211_beacon_offsets *bo) 2461{ 2462 struct ieee80211vap *vap = ni->ni_vap; 2463 struct ieee80211com *ic = ni->ni_ic; 2464 struct ifnet *ifp = vap->iv_ifp; 2465 struct ieee80211_frame *wh; 2466 struct mbuf *m; 2467 int pktlen; 2468 uint8_t *frm; 2469 2470 /* 2471 * beacon frame format 2472 * [8] time stamp 2473 * [2] beacon interval 2474 * [2] cabability information 2475 * [tlv] ssid 2476 * [tlv] supported rates 2477 * [3] parameter set (DS) 2478 * [8] CF parameter set (optional) 2479 * [tlv] parameter set (IBSS/TIM) 2480 * [tlv] country (optional) 2481 * [3] power control (optional) 2482 * [5] channel switch announcement (CSA) (optional) 2483 * [tlv] extended rate phy (ERP) 2484 * [tlv] extended supported rates 2485 * [tlv] RSN parameters 2486 * [tlv] HT capabilities 2487 * [tlv] HT information 2488 * [tlv] Vendor OUI HT capabilities (optional) 2489 * [tlv] Vendor OUI HT information (optional) 2490 * XXX Vendor-specific OIDs (e.g. Atheros) 2491 * [tlv] WPA parameters 2492 * [tlv] WME parameters 2493 * [tlv] TDMA parameters (optional) 2494 * [tlv] application data (optional) 2495 * NB: we allocate the max space required for the TIM bitmap. 2496 * XXX how big is this? 2497 */ 2498 pktlen = 8 /* time stamp */ 2499 + sizeof(uint16_t) /* beacon interval */ 2500 + sizeof(uint16_t) /* capabilities */ 2501 + 2 + ni->ni_esslen /* ssid */ 2502 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2503 + 2 + 1 /* DS parameters */ 2504 + 2 + 6 /* CF parameters */ 2505 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2506 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2507 + 2 + 1 /* power control */ 2508 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2509 + 2 + 1 /* ERP */ 2510 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2511 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2512 2*sizeof(struct ieee80211_ie_wpa) : 0) 2513 /* XXX conditional? */ 2514 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2515 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2516 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2517 sizeof(struct ieee80211_wme_param) : 0) 2518#ifdef IEEE80211_SUPPORT_SUPERG 2519 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2520#endif 2521#ifdef IEEE80211_SUPPORT_TDMA 2522 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2523 sizeof(struct ieee80211_tdma_param) : 0) 2524#endif 2525 + IEEE80211_MAX_APPIE 2526 ; 2527 m = ieee80211_getmgtframe(&frm, 2528 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2529 if (m == NULL) { 2530 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2531 "%s: cannot get buf; size %u\n", __func__, pktlen); 2532 vap->iv_stats.is_tx_nobuf++; 2533 return NULL; 2534 } 2535 ieee80211_beacon_construct(m, frm, bo, ni); 2536 2537 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2538 KASSERT(m != NULL, ("no space for 802.11 header?")); 2539 wh = mtod(m, struct ieee80211_frame *); 2540 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2541 IEEE80211_FC0_SUBTYPE_BEACON; 2542 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2543 *(uint16_t *)wh->i_dur = 0; 2544 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2545 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2546 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2547 *(uint16_t *)wh->i_seq = 0; 2548 2549 return m; 2550} 2551 2552/* 2553 * Update the dynamic parts of a beacon frame based on the current state. 2554 */ 2555int 2556ieee80211_beacon_update(struct ieee80211_node *ni, 2557 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2558{ 2559 struct ieee80211vap *vap = ni->ni_vap; 2560 struct ieee80211com *ic = ni->ni_ic; 2561 int len_changed = 0; 2562 uint16_t capinfo; 2563 2564 IEEE80211_LOCK(ic); 2565 /* 2566 * Handle 11h channel change when we've reached the count. 2567 * We must recalculate the beacon frame contents to account 2568 * for the new channel. Note we do this only for the first 2569 * vap that reaches this point; subsequent vaps just update 2570 * their beacon state to reflect the recalculated channel. 2571 */ 2572 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2573 vap->iv_csa_count == ic->ic_csa_count) { 2574 vap->iv_csa_count = 0; 2575 /* 2576 * Effect channel change before reconstructing the beacon 2577 * frame contents as many places reference ni_chan. 2578 */ 2579 if (ic->ic_csa_newchan != NULL) 2580 ieee80211_csa_completeswitch(ic); 2581 /* 2582 * NB: ieee80211_beacon_construct clears all pending 2583 * updates in bo_flags so we don't need to explicitly 2584 * clear IEEE80211_BEACON_CSA. 2585 */ 2586 ieee80211_beacon_construct(m, 2587 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2588 2589 /* XXX do WME aggressive mode processing? */ 2590 IEEE80211_UNLOCK(ic); 2591 return 1; /* just assume length changed */ 2592 } 2593 2594 /* XXX faster to recalculate entirely or just changes? */ 2595 capinfo = getcapinfo(vap, ni->ni_chan); 2596 *bo->bo_caps = htole16(capinfo); 2597 2598 if (vap->iv_flags & IEEE80211_F_WME) { 2599 struct ieee80211_wme_state *wme = &ic->ic_wme; 2600 2601 /* 2602 * Check for agressive mode change. When there is 2603 * significant high priority traffic in the BSS 2604 * throttle back BE traffic by using conservative 2605 * parameters. Otherwise BE uses agressive params 2606 * to optimize performance of legacy/non-QoS traffic. 2607 */ 2608 if (wme->wme_flags & WME_F_AGGRMODE) { 2609 if (wme->wme_hipri_traffic > 2610 wme->wme_hipri_switch_thresh) { 2611 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2612 "%s: traffic %u, disable aggressive mode\n", 2613 __func__, wme->wme_hipri_traffic); 2614 wme->wme_flags &= ~WME_F_AGGRMODE; 2615 ieee80211_wme_updateparams_locked(vap); 2616 wme->wme_hipri_traffic = 2617 wme->wme_hipri_switch_hysteresis; 2618 } else 2619 wme->wme_hipri_traffic = 0; 2620 } else { 2621 if (wme->wme_hipri_traffic <= 2622 wme->wme_hipri_switch_thresh) { 2623 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2624 "%s: traffic %u, enable aggressive mode\n", 2625 __func__, wme->wme_hipri_traffic); 2626 wme->wme_flags |= WME_F_AGGRMODE; 2627 ieee80211_wme_updateparams_locked(vap); 2628 wme->wme_hipri_traffic = 0; 2629 } else 2630 wme->wme_hipri_traffic = 2631 wme->wme_hipri_switch_hysteresis; 2632 } 2633 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2634 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2635 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2636 } 2637 } 2638 2639 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2640 ieee80211_ht_update_beacon(vap, bo); 2641 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2642 } 2643#ifdef IEEE80211_SUPPORT_TDMA 2644 if (vap->iv_caps & IEEE80211_C_TDMA) { 2645 /* 2646 * NB: the beacon is potentially updated every TBTT. 2647 */ 2648 ieee80211_tdma_update_beacon(vap, bo); 2649 } 2650#endif 2651 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2652 struct ieee80211_tim_ie *tie = 2653 (struct ieee80211_tim_ie *) bo->bo_tim; 2654 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2655 u_int timlen, timoff, i; 2656 /* 2657 * ATIM/DTIM needs updating. If it fits in the 2658 * current space allocated then just copy in the 2659 * new bits. Otherwise we need to move any trailing 2660 * data to make room. Note that we know there is 2661 * contiguous space because ieee80211_beacon_allocate 2662 * insures there is space in the mbuf to write a 2663 * maximal-size virtual bitmap (based on iv_max_aid). 2664 */ 2665 /* 2666 * Calculate the bitmap size and offset, copy any 2667 * trailer out of the way, and then copy in the 2668 * new bitmap and update the information element. 2669 * Note that the tim bitmap must contain at least 2670 * one byte and any offset must be even. 2671 */ 2672 if (vap->iv_ps_pending != 0) { 2673 timoff = 128; /* impossibly large */ 2674 for (i = 0; i < vap->iv_tim_len; i++) 2675 if (vap->iv_tim_bitmap[i]) { 2676 timoff = i &~ 1; 2677 break; 2678 } 2679 KASSERT(timoff != 128, ("tim bitmap empty!")); 2680 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2681 if (vap->iv_tim_bitmap[i]) 2682 break; 2683 timlen = 1 + (i - timoff); 2684 } else { 2685 timoff = 0; 2686 timlen = 1; 2687 } 2688 if (timlen != bo->bo_tim_len) { 2689 /* copy up/down trailer */ 2690 int adjust = tie->tim_bitmap+timlen 2691 - bo->bo_tim_trailer; 2692 ovbcopy(bo->bo_tim_trailer, 2693 bo->bo_tim_trailer+adjust, 2694 bo->bo_tim_trailer_len); 2695 bo->bo_tim_trailer += adjust; 2696 bo->bo_erp += adjust; 2697 bo->bo_htinfo += adjust; 2698#ifdef IEEE80211_SUPERG_SUPPORT 2699 bo->bo_ath += adjust; 2700#endif 2701#ifdef IEEE80211_TDMA_SUPPORT 2702 bo->bo_tdma += adjust; 2703#endif 2704 bo->bo_appie += adjust; 2705 bo->bo_wme += adjust; 2706 bo->bo_csa += adjust; 2707 bo->bo_tim_len = timlen; 2708 2709 /* update information element */ 2710 tie->tim_len = 3 + timlen; 2711 tie->tim_bitctl = timoff; 2712 len_changed = 1; 2713 } 2714 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2715 bo->bo_tim_len); 2716 2717 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2718 2719 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2720 "%s: TIM updated, pending %u, off %u, len %u\n", 2721 __func__, vap->iv_ps_pending, timoff, timlen); 2722 } 2723 /* count down DTIM period */ 2724 if (tie->tim_count == 0) 2725 tie->tim_count = tie->tim_period - 1; 2726 else 2727 tie->tim_count--; 2728 /* update state for buffered multicast frames on DTIM */ 2729 if (mcast && tie->tim_count == 0) 2730 tie->tim_bitctl |= 1; 2731 else 2732 tie->tim_bitctl &= ~1; 2733 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2734 struct ieee80211_csa_ie *csa = 2735 (struct ieee80211_csa_ie *) bo->bo_csa; 2736 2737 /* 2738 * Insert or update CSA ie. If we're just starting 2739 * to count down to the channel switch then we need 2740 * to insert the CSA ie. Otherwise we just need to 2741 * drop the count. The actual change happens above 2742 * when the vap's count reaches the target count. 2743 */ 2744 if (vap->iv_csa_count == 0) { 2745 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2746 bo->bo_erp += sizeof(*csa); 2747 bo->bo_htinfo += sizeof(*csa); 2748 bo->bo_wme += sizeof(*csa); 2749#ifdef IEEE80211_SUPERG_SUPPORT 2750 bo->bo_ath += sizeof(*csa); 2751#endif 2752#ifdef IEEE80211_TDMA_SUPPORT 2753 bo->bo_tdma += sizeof(*csa); 2754#endif 2755 bo->bo_appie += sizeof(*csa); 2756 bo->bo_csa_trailer_len += sizeof(*csa); 2757 bo->bo_tim_trailer_len += sizeof(*csa); 2758 m->m_len += sizeof(*csa); 2759 m->m_pkthdr.len += sizeof(*csa); 2760 2761 ieee80211_add_csa(bo->bo_csa, vap); 2762 } else 2763 csa->csa_count--; 2764 vap->iv_csa_count++; 2765 /* NB: don't clear IEEE80211_BEACON_CSA */ 2766 } 2767 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2768 /* 2769 * ERP element needs updating. 2770 */ 2771 (void) ieee80211_add_erp(bo->bo_erp, ic); 2772 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2773 } 2774#ifdef IEEE80211_SUPPORT_SUPERG 2775 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2776 ieee80211_add_athcaps(bo->bo_ath, ni); 2777 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2778 } 2779#endif 2780 } 2781 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2782 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2783 int aielen; 2784 uint8_t *frm; 2785 2786 aielen = 0; 2787 if (aie != NULL) 2788 aielen += aie->ie_len; 2789 if (aielen != bo->bo_appie_len) { 2790 /* copy up/down trailer */ 2791 int adjust = aielen - bo->bo_appie_len; 2792 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2793 bo->bo_tim_trailer_len); 2794 bo->bo_tim_trailer += adjust; 2795 bo->bo_appie += adjust; 2796 bo->bo_appie_len = aielen; 2797 2798 len_changed = 1; 2799 } 2800 frm = bo->bo_appie; 2801 if (aie != NULL) 2802 frm = add_appie(frm, aie); 2803 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2804 } 2805 IEEE80211_UNLOCK(ic); 2806 2807 return len_changed; 2808} 2809