ieee80211_output.c revision 191550
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 191550 2009-04-26 22:45:21Z 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 * Stash the node pointer. Note that we do this after 246 * any call to ieee80211_dwds_mcast because that code 247 * uses any existing value for rcvif to identify the 248 * interface it (might have been) received on. 249 */ 250 m->m_pkthdr.rcvif = (void *)ni; 251 252 BPF_MTAP(ifp, m); /* 802.3 tx */ 253 254#ifdef IEEE80211_SUPPORT_SUPERG 255 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 256 m = ieee80211_ff_check(ni, m); 257 if (m == NULL) { 258 /* NB: any ni ref held on stageq */ 259 continue; 260 } 261 } 262#endif /* IEEE80211_SUPPORT_SUPERG */ 263 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 264 /* 265 * Encapsulate the packet in prep for transmission. 266 */ 267 m = ieee80211_encap(vap, ni, m); 268 if (m == NULL) { 269 /* NB: stat+msg handled in ieee80211_encap */ 270 ieee80211_free_node(ni); 271 continue; 272 } 273 } 274 275 /* XXX fragmented frames not handled */ 276 if (bpf_peers_present(vap->iv_rawbpf)) 277 bpf_mtap(vap->iv_rawbpf, m); 278 279 error = parent->if_transmit(parent, m); 280 if (error != 0) { 281 /* NB: IFQ_HANDOFF reclaims mbuf */ 282 ieee80211_free_node(ni); 283 } else { 284 ifp->if_opackets++; 285 } 286 ic->ic_lastdata = ticks; 287 } 288#undef IS_DWDS 289} 290 291/* 292 * 802.11 output routine. This is (currently) used only to 293 * connect bpf write calls to the 802.11 layer for injecting 294 * raw 802.11 frames. 295 */ 296int 297ieee80211_output(struct ifnet *ifp, struct mbuf *m, 298 struct sockaddr *dst, struct route *ro) 299{ 300#define senderr(e) do { error = (e); goto bad;} while (0) 301 struct ieee80211_node *ni = NULL; 302 struct ieee80211vap *vap; 303 struct ieee80211_frame *wh; 304 int error; 305 306 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 307 /* 308 * Short-circuit requests if the vap is marked OACTIVE 309 * as this is used when tearing down state to indicate 310 * the vap may be gone. This can also happen because a 311 * packet came down through ieee80211_start before the 312 * vap entered RUN state in which case it's also ok to 313 * just drop the frame. This should not be necessary 314 * but callers of if_output don't check OACTIVE. 315 */ 316 senderr(ENETDOWN); 317 } 318 vap = ifp->if_softc; 319 /* 320 * Hand to the 802.3 code if not tagged as 321 * a raw 802.11 frame. 322 */ 323 if (dst->sa_family != AF_IEEE80211) 324 return vap->iv_output(ifp, m, dst, ro); 325#ifdef MAC 326 error = mac_check_ifnet_transmit(ifp, m); 327 if (error) 328 senderr(error); 329#endif 330 if (ifp->if_flags & IFF_MONITOR) 331 senderr(ENETDOWN); 332 if (!IFNET_IS_UP_RUNNING(ifp)) 333 senderr(ENETDOWN); 334 if (vap->iv_state == IEEE80211_S_CAC) { 335 IEEE80211_DPRINTF(vap, 336 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 337 "block %s frame in CAC state\n", "raw data"); 338 vap->iv_stats.is_tx_badstate++; 339 senderr(EIO); /* XXX */ 340 } 341 /* XXX bypass bridge, pfil, carp, etc. */ 342 343 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 344 senderr(EIO); /* XXX */ 345 wh = mtod(m, struct ieee80211_frame *); 346 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 347 IEEE80211_FC0_VERSION_0) 348 senderr(EIO); /* XXX */ 349 350 /* locate destination node */ 351 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 352 case IEEE80211_FC1_DIR_NODS: 353 case IEEE80211_FC1_DIR_FROMDS: 354 ni = ieee80211_find_txnode(vap, wh->i_addr1); 355 break; 356 case IEEE80211_FC1_DIR_TODS: 357 case IEEE80211_FC1_DIR_DSTODS: 358 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 359 senderr(EIO); /* XXX */ 360 ni = ieee80211_find_txnode(vap, wh->i_addr3); 361 break; 362 default: 363 senderr(EIO); /* XXX */ 364 } 365 if (ni == NULL) { 366 /* 367 * Permit packets w/ bpf params through regardless 368 * (see below about sa_len). 369 */ 370 if (dst->sa_len == 0) 371 senderr(EHOSTUNREACH); 372 ni = ieee80211_ref_node(vap->iv_bss); 373 } 374 375 /* 376 * Sanitize mbuf for net80211 flags leaked from above. 377 * 378 * NB: This must be done before ieee80211_classify as 379 * it marks EAPOL in frames with M_EAPOL. 380 */ 381 m->m_flags &= ~M_80211_TX; 382 383 /* calculate priority so drivers can find the tx queue */ 384 /* XXX assumes an 802.3 frame */ 385 if (ieee80211_classify(ni, m)) 386 senderr(EIO); /* XXX */ 387 388 if (bpf_peers_present(vap->iv_rawbpf)) 389 bpf_mtap(vap->iv_rawbpf, m); 390 391 IEEE80211_NODE_STAT(ni, tx_data); 392 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 393 IEEE80211_NODE_STAT(ni, tx_mcast); 394 m->m_flags |= M_MCAST; 395 } else 396 IEEE80211_NODE_STAT(ni, tx_ucast); 397 /* NB: ieee80211_encap does not include 802.11 header */ 398 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 399 400 /* 401 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 402 * present by setting the sa_len field of the sockaddr (yes, 403 * this is a hack). 404 * NB: we assume sa_data is suitably aligned to cast. 405 */ 406 return vap->iv_ic->ic_raw_xmit(ni, m, 407 (const struct ieee80211_bpf_params *)(dst->sa_len ? 408 dst->sa_data : NULL)); 409bad: 410 if (m != NULL) 411 m_freem(m); 412 if (ni != NULL) 413 ieee80211_free_node(ni); 414 return error; 415#undef senderr 416} 417 418/* 419 * Set the direction field and address fields of an outgoing 420 * frame. Note this should be called early on in constructing 421 * a frame as it sets i_fc[1]; other bits can then be or'd in. 422 */ 423static void 424ieee80211_send_setup( 425 struct ieee80211_node *ni, 426 struct mbuf *m, 427 int type, int tid, 428 const uint8_t sa[IEEE80211_ADDR_LEN], 429 const uint8_t da[IEEE80211_ADDR_LEN], 430 const uint8_t bssid[IEEE80211_ADDR_LEN]) 431{ 432#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 433 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 434 ieee80211_seq seqno; 435 436 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 437 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 438 struct ieee80211vap *vap = ni->ni_vap; 439 440 switch (vap->iv_opmode) { 441 case IEEE80211_M_STA: 442 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 443 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 444 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 445 IEEE80211_ADDR_COPY(wh->i_addr3, da); 446 break; 447 case IEEE80211_M_IBSS: 448 case IEEE80211_M_AHDEMO: 449 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 450 IEEE80211_ADDR_COPY(wh->i_addr1, da); 451 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 452 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 453 break; 454 case IEEE80211_M_HOSTAP: 455 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 456 IEEE80211_ADDR_COPY(wh->i_addr1, da); 457 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 458 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 459 break; 460 case IEEE80211_M_WDS: 461 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 462 IEEE80211_ADDR_COPY(wh->i_addr1, da); 463 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 464 IEEE80211_ADDR_COPY(wh->i_addr3, da); 465 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 466 break; 467 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 468 break; 469 } 470 } else { 471 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 472 IEEE80211_ADDR_COPY(wh->i_addr1, da); 473 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 474 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 475 } 476 *(uint16_t *)&wh->i_dur[0] = 0; 477 478 seqno = ni->ni_txseqs[tid]++; 479 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 480 481 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 482 m->m_flags |= M_MCAST; 483#undef WH4 484} 485 486/* 487 * Send a management frame to the specified node. The node pointer 488 * must have a reference as the pointer will be passed to the driver 489 * and potentially held for a long time. If the frame is successfully 490 * dispatched to the driver, then it is responsible for freeing the 491 * reference (and potentially free'ing up any associated storage); 492 * otherwise deal with reclaiming any reference (on error). 493 */ 494int 495ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 496 struct ieee80211_bpf_params *params) 497{ 498 struct ieee80211vap *vap = ni->ni_vap; 499 struct ieee80211com *ic = ni->ni_ic; 500 struct ieee80211_frame *wh; 501 502 KASSERT(ni != NULL, ("null node")); 503 504 if (vap->iv_state == IEEE80211_S_CAC) { 505 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 506 ni, "block %s frame in CAC state", 507 ieee80211_mgt_subtype_name[ 508 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 509 IEEE80211_FC0_SUBTYPE_SHIFT]); 510 vap->iv_stats.is_tx_badstate++; 511 ieee80211_free_node(ni); 512 m_freem(m); 513 return EIO; /* XXX */ 514 } 515 516 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 517 if (m == NULL) { 518 ieee80211_free_node(ni); 519 return ENOMEM; 520 } 521 522 wh = mtod(m, struct ieee80211_frame *); 523 ieee80211_send_setup(ni, m, 524 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 525 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 526 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 527 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 528 "encrypting frame (%s)", __func__); 529 wh->i_fc[1] |= IEEE80211_FC1_WEP; 530 } 531 m->m_flags |= M_ENCAP; /* mark encapsulated */ 532 533 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 534 M_WME_SETAC(m, params->ibp_pri); 535 536#ifdef IEEE80211_DEBUG 537 /* avoid printing too many frames */ 538 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 539 ieee80211_msg_dumppkts(vap)) { 540 printf("[%s] send %s on channel %u\n", 541 ether_sprintf(wh->i_addr1), 542 ieee80211_mgt_subtype_name[ 543 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 544 IEEE80211_FC0_SUBTYPE_SHIFT], 545 ieee80211_chan2ieee(ic, ic->ic_curchan)); 546 } 547#endif 548 IEEE80211_NODE_STAT(ni, tx_mgmt); 549 550 return ic->ic_raw_xmit(ni, m, params); 551} 552 553/* 554 * Send a null data frame to the specified node. If the station 555 * is setup for QoS then a QoS Null Data frame is constructed. 556 * If this is a WDS station then a 4-address frame is constructed. 557 * 558 * NB: the caller is assumed to have setup a node reference 559 * for use; this is necessary to deal with a race condition 560 * when probing for inactive stations. Like ieee80211_mgmt_output 561 * we must cleanup any node reference on error; however we 562 * can safely just unref it as we know it will never be the 563 * last reference to the node. 564 */ 565int 566ieee80211_send_nulldata(struct ieee80211_node *ni) 567{ 568 struct ieee80211vap *vap = ni->ni_vap; 569 struct ieee80211com *ic = ni->ni_ic; 570 struct mbuf *m; 571 struct ieee80211_frame *wh; 572 int hdrlen; 573 uint8_t *frm; 574 575 if (vap->iv_state == IEEE80211_S_CAC) { 576 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 577 ni, "block %s frame in CAC state", "null data"); 578 ieee80211_unref_node(&ni); 579 vap->iv_stats.is_tx_badstate++; 580 return EIO; /* XXX */ 581 } 582 583 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 584 hdrlen = sizeof(struct ieee80211_qosframe); 585 else 586 hdrlen = sizeof(struct ieee80211_frame); 587 /* NB: only WDS vap's get 4-address frames */ 588 if (vap->iv_opmode == IEEE80211_M_WDS) 589 hdrlen += IEEE80211_ADDR_LEN; 590 if (ic->ic_flags & IEEE80211_F_DATAPAD) 591 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 592 593 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 594 if (m == NULL) { 595 /* XXX debug msg */ 596 ieee80211_unref_node(&ni); 597 vap->iv_stats.is_tx_nobuf++; 598 return ENOMEM; 599 } 600 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 601 ("leading space %zd", M_LEADINGSPACE(m))); 602 M_PREPEND(m, hdrlen, M_DONTWAIT); 603 if (m == NULL) { 604 /* NB: cannot happen */ 605 ieee80211_free_node(ni); 606 return ENOMEM; 607 } 608 609 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 610 if (ni->ni_flags & IEEE80211_NODE_QOS) { 611 const int tid = WME_AC_TO_TID(WME_AC_BE); 612 uint8_t *qos; 613 614 ieee80211_send_setup(ni, m, 615 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 616 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 617 618 if (vap->iv_opmode == IEEE80211_M_WDS) 619 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 620 else 621 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 622 qos[0] = tid & IEEE80211_QOS_TID; 623 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 624 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 625 qos[1] = 0; 626 } else { 627 ieee80211_send_setup(ni, m, 628 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 629 IEEE80211_NONQOS_TID, 630 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 631 } 632 if (vap->iv_opmode != IEEE80211_M_WDS) { 633 /* NB: power management bit is never sent by an AP */ 634 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 635 vap->iv_opmode != IEEE80211_M_HOSTAP) 636 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 637 } 638 m->m_len = m->m_pkthdr.len = hdrlen; 639 m->m_flags |= M_ENCAP; /* mark encapsulated */ 640 641 M_WME_SETAC(m, WME_AC_BE); 642 643 IEEE80211_NODE_STAT(ni, tx_data); 644 645 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 646 "send %snull data frame on channel %u, pwr mgt %s", 647 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 648 ieee80211_chan2ieee(ic, ic->ic_curchan), 649 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 650 651 return ic->ic_raw_xmit(ni, m, NULL); 652} 653 654/* 655 * Assign priority to a frame based on any vlan tag assigned 656 * to the station and/or any Diffserv setting in an IP header. 657 * Finally, if an ACM policy is setup (in station mode) it's 658 * applied. 659 */ 660int 661ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 662{ 663 const struct ether_header *eh = mtod(m, struct ether_header *); 664 int v_wme_ac, d_wme_ac, ac; 665 666 /* 667 * Always promote PAE/EAPOL frames to high priority. 668 */ 669 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 670 /* NB: mark so others don't need to check header */ 671 m->m_flags |= M_EAPOL; 672 ac = WME_AC_VO; 673 goto done; 674 } 675 /* 676 * Non-qos traffic goes to BE. 677 */ 678 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 679 ac = WME_AC_BE; 680 goto done; 681 } 682 683 /* 684 * If node has a vlan tag then all traffic 685 * to it must have a matching tag. 686 */ 687 v_wme_ac = 0; 688 if (ni->ni_vlan != 0) { 689 if ((m->m_flags & M_VLANTAG) == 0) { 690 IEEE80211_NODE_STAT(ni, tx_novlantag); 691 return 1; 692 } 693 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 694 EVL_VLANOFTAG(ni->ni_vlan)) { 695 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 696 return 1; 697 } 698 /* map vlan priority to AC */ 699 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 700 } 701 702#ifdef INET 703 if (eh->ether_type == htons(ETHERTYPE_IP)) { 704 uint8_t tos; 705 /* 706 * IP frame, map the DSCP bits from the TOS field. 707 */ 708 /* XXX m_copydata may be too slow for fast path */ 709 /* NB: ip header may not be in first mbuf */ 710 m_copydata(m, sizeof(struct ether_header) + 711 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 712 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 713 d_wme_ac = TID_TO_WME_AC(tos); 714 } else { 715#endif /* INET */ 716 d_wme_ac = WME_AC_BE; 717#ifdef INET 718 } 719#endif 720 /* 721 * Use highest priority AC. 722 */ 723 if (v_wme_ac > d_wme_ac) 724 ac = v_wme_ac; 725 else 726 ac = d_wme_ac; 727 728 /* 729 * Apply ACM policy. 730 */ 731 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 732 static const int acmap[4] = { 733 WME_AC_BK, /* WME_AC_BE */ 734 WME_AC_BK, /* WME_AC_BK */ 735 WME_AC_BE, /* WME_AC_VI */ 736 WME_AC_VI, /* WME_AC_VO */ 737 }; 738 struct ieee80211com *ic = ni->ni_ic; 739 740 while (ac != WME_AC_BK && 741 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 742 ac = acmap[ac]; 743 } 744done: 745 M_WME_SETAC(m, ac); 746 return 0; 747} 748 749/* 750 * Insure there is sufficient contiguous space to encapsulate the 751 * 802.11 data frame. If room isn't already there, arrange for it. 752 * Drivers and cipher modules assume we have done the necessary work 753 * and fail rudely if they don't find the space they need. 754 */ 755struct mbuf * 756ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 757 struct ieee80211_key *key, struct mbuf *m) 758{ 759#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 760 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 761 762 if (key != NULL) { 763 /* XXX belongs in crypto code? */ 764 needed_space += key->wk_cipher->ic_header; 765 /* XXX frags */ 766 /* 767 * When crypto is being done in the host we must insure 768 * the data are writable for the cipher routines; clone 769 * a writable mbuf chain. 770 * XXX handle SWMIC specially 771 */ 772 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 773 m = m_unshare(m, M_NOWAIT); 774 if (m == NULL) { 775 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 776 "%s: cannot get writable mbuf\n", __func__); 777 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 778 return NULL; 779 } 780 } 781 } 782 /* 783 * We know we are called just before stripping an Ethernet 784 * header and prepending an LLC header. This means we know 785 * there will be 786 * sizeof(struct ether_header) - sizeof(struct llc) 787 * bytes recovered to which we need additional space for the 788 * 802.11 header and any crypto header. 789 */ 790 /* XXX check trailing space and copy instead? */ 791 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 792 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 793 if (n == NULL) { 794 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 795 "%s: cannot expand storage\n", __func__); 796 vap->iv_stats.is_tx_nobuf++; 797 m_freem(m); 798 return NULL; 799 } 800 KASSERT(needed_space <= MHLEN, 801 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 802 /* 803 * Setup new mbuf to have leading space to prepend the 804 * 802.11 header and any crypto header bits that are 805 * required (the latter are added when the driver calls 806 * back to ieee80211_crypto_encap to do crypto encapsulation). 807 */ 808 /* NB: must be first 'cuz it clobbers m_data */ 809 m_move_pkthdr(n, m); 810 n->m_len = 0; /* NB: m_gethdr does not set */ 811 n->m_data += needed_space; 812 /* 813 * Pull up Ethernet header to create the expected layout. 814 * We could use m_pullup but that's overkill (i.e. we don't 815 * need the actual data) and it cannot fail so do it inline 816 * for speed. 817 */ 818 /* NB: struct ether_header is known to be contiguous */ 819 n->m_len += sizeof(struct ether_header); 820 m->m_len -= sizeof(struct ether_header); 821 m->m_data += sizeof(struct ether_header); 822 /* 823 * Replace the head of the chain. 824 */ 825 n->m_next = m; 826 m = n; 827 } 828 return m; 829#undef TO_BE_RECLAIMED 830} 831 832/* 833 * Return the transmit key to use in sending a unicast frame. 834 * If a unicast key is set we use that. When no unicast key is set 835 * we fall back to the default transmit key. 836 */ 837static __inline struct ieee80211_key * 838ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 839 struct ieee80211_node *ni) 840{ 841 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 842 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 843 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 844 return NULL; 845 return &vap->iv_nw_keys[vap->iv_def_txkey]; 846 } else { 847 return &ni->ni_ucastkey; 848 } 849} 850 851/* 852 * Return the transmit key to use in sending a multicast frame. 853 * Multicast traffic always uses the group key which is installed as 854 * the default tx key. 855 */ 856static __inline struct ieee80211_key * 857ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 858 struct ieee80211_node *ni) 859{ 860 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 861 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 862 return NULL; 863 return &vap->iv_nw_keys[vap->iv_def_txkey]; 864} 865 866/* 867 * Encapsulate an outbound data frame. The mbuf chain is updated. 868 * If an error is encountered NULL is returned. The caller is required 869 * to provide a node reference and pullup the ethernet header in the 870 * first mbuf. 871 * 872 * NB: Packet is assumed to be processed by ieee80211_classify which 873 * marked EAPOL frames w/ M_EAPOL. 874 */ 875struct mbuf * 876ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 877 struct mbuf *m) 878{ 879#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 880 struct ieee80211com *ic = ni->ni_ic; 881 struct ether_header eh; 882 struct ieee80211_frame *wh; 883 struct ieee80211_key *key; 884 struct llc *llc; 885 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 886 ieee80211_seq seqno; 887 888 /* 889 * Copy existing Ethernet header to a safe place. The 890 * rest of the code assumes it's ok to strip it when 891 * reorganizing state for the final encapsulation. 892 */ 893 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 894 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 895 896 /* 897 * Insure space for additional headers. First identify 898 * transmit key to use in calculating any buffer adjustments 899 * required. This is also used below to do privacy 900 * encapsulation work. Then calculate the 802.11 header 901 * size and any padding required by the driver. 902 * 903 * Note key may be NULL if we fall back to the default 904 * transmit key and that is not set. In that case the 905 * buffer may not be expanded as needed by the cipher 906 * routines, but they will/should discard it. 907 */ 908 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 909 if (vap->iv_opmode == IEEE80211_M_STA || 910 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 911 (vap->iv_opmode == IEEE80211_M_WDS && 912 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 913 key = ieee80211_crypto_getucastkey(vap, ni); 914 else 915 key = ieee80211_crypto_getmcastkey(vap, ni); 916 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 917 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 918 eh.ether_dhost, 919 "no default transmit key (%s) deftxkey %u", 920 __func__, vap->iv_def_txkey); 921 vap->iv_stats.is_tx_nodefkey++; 922 goto bad; 923 } 924 } else 925 key = NULL; 926 /* 927 * XXX Some ap's don't handle QoS-encapsulated EAPOL 928 * frames so suppress use. This may be an issue if other 929 * ap's require all data frames to be QoS-encapsulated 930 * once negotiated in which case we'll need to make this 931 * configurable. 932 */ 933 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 934 (m->m_flags & M_EAPOL) == 0; 935 if (addqos) 936 hdrsize = sizeof(struct ieee80211_qosframe); 937 else 938 hdrsize = sizeof(struct ieee80211_frame); 939 /* 940 * 4-address frames need to be generated for: 941 * o packets sent through a WDS vap (IEEE80211_M_WDS) 942 * o packets relayed by a station operating with dynamic WDS 943 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 944 */ 945 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 946 (vap->iv_opmode == IEEE80211_M_STA && 947 (vap->iv_flags & IEEE80211_F_DWDS) && 948 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 949 if (is4addr) 950 hdrsize += IEEE80211_ADDR_LEN; 951 /* 952 * Honor driver DATAPAD requirement. 953 */ 954 if (ic->ic_flags & IEEE80211_F_DATAPAD) 955 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 956 else 957 hdrspace = hdrsize; 958 959 if (__predict_true((m->m_flags & M_FF) == 0)) { 960 /* 961 * Normal frame. 962 */ 963 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 964 if (m == NULL) { 965 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 966 goto bad; 967 } 968 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 969 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 970 llc = mtod(m, struct llc *); 971 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 972 llc->llc_control = LLC_UI; 973 llc->llc_snap.org_code[0] = 0; 974 llc->llc_snap.org_code[1] = 0; 975 llc->llc_snap.org_code[2] = 0; 976 llc->llc_snap.ether_type = eh.ether_type; 977 } else { 978#ifdef IEEE80211_SUPPORT_SUPERG 979 /* 980 * Aggregated frame. 981 */ 982 m = ieee80211_ff_encap(vap, m, hdrspace, key); 983 if (m == NULL) 984#endif 985 goto bad; 986 } 987 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 988 989 M_PREPEND(m, hdrspace, M_DONTWAIT); 990 if (m == NULL) { 991 vap->iv_stats.is_tx_nobuf++; 992 goto bad; 993 } 994 wh = mtod(m, struct ieee80211_frame *); 995 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 996 *(uint16_t *)wh->i_dur = 0; 997 if (is4addr) { 998 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 999 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1000 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1001 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1002 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1003 } else switch (vap->iv_opmode) { 1004 case IEEE80211_M_STA: 1005 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1006 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1007 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1008 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1009 break; 1010 case IEEE80211_M_IBSS: 1011 case IEEE80211_M_AHDEMO: 1012 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1013 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1014 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1015 /* 1016 * NB: always use the bssid from iv_bss as the 1017 * neighbor's may be stale after an ibss merge 1018 */ 1019 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1020 break; 1021 case IEEE80211_M_HOSTAP: 1022 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1023 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1024 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1025 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1026 break; 1027 case IEEE80211_M_MONITOR: 1028 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1029 goto bad; 1030 } 1031 if (m->m_flags & M_MORE_DATA) 1032 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1033 if (addqos) { 1034 uint8_t *qos; 1035 int ac, tid; 1036 1037 if (is4addr) { 1038 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1039 } else 1040 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1041 ac = M_WME_GETAC(m); 1042 /* map from access class/queue to 11e header priorty value */ 1043 tid = WME_AC_TO_TID(ac); 1044 qos[0] = tid & IEEE80211_QOS_TID; 1045 /* 1046 * Check if A-MPDU tx aggregation is setup or if we 1047 * should try to enable it. The sta must be associated 1048 * with HT and A-MPDU enabled for use. When the policy 1049 * routine decides we should enable A-MPDU we issue an 1050 * ADDBA request and wait for a reply. The frame being 1051 * encapsulated will go out w/o using A-MPDU, or possibly 1052 * it might be collected by the driver and held/retransmit. 1053 * The default ic_ampdu_enable routine handles staggering 1054 * ADDBA requests in case the receiver NAK's us or we are 1055 * otherwise unable to establish a BA stream. 1056 */ 1057 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1058 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1059 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1060 1061 ieee80211_txampdu_count_packet(tap); 1062 if (IEEE80211_AMPDU_RUNNING(tap)) { 1063 /* 1064 * Operational, mark frame for aggregation. 1065 * 1066 * NB: We support only immediate BA's for 1067 * AMPDU which means we set the QoS control 1068 * field to "normal ack" (0) to get "implicit 1069 * block ack" behaviour. 1070 */ 1071 m->m_flags |= M_AMPDU_MPDU; 1072 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1073 ic->ic_ampdu_enable(ni, tap)) { 1074 /* 1075 * Not negotiated yet, request service. 1076 */ 1077 ieee80211_ampdu_request(ni, tap); 1078 } 1079 } 1080 /* XXX works even when BA marked above */ 1081 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1082 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1083 qos[1] = 0; 1084 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1085 1086 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1087 /* 1088 * NB: don't assign a sequence # to potential 1089 * aggregates; we expect this happens at the 1090 * point the frame comes off any aggregation q 1091 * as otherwise we may introduce holes in the 1092 * BA sequence space and/or make window accouting 1093 * more difficult. 1094 * 1095 * XXX may want to control this with a driver 1096 * capability; this may also change when we pull 1097 * aggregation up into net80211 1098 */ 1099 seqno = ni->ni_txseqs[tid]++; 1100 *(uint16_t *)wh->i_seq = 1101 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1102 } 1103 } else { 1104 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1105 *(uint16_t *)wh->i_seq = 1106 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1107 } 1108 /* check if xmit fragmentation is required */ 1109 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1110 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1111 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1112 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1113 if (key != NULL) { 1114 /* 1115 * IEEE 802.1X: send EAPOL frames always in the clear. 1116 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1117 */ 1118 if ((m->m_flags & M_EAPOL) == 0 || 1119 ((vap->iv_flags & IEEE80211_F_WPA) && 1120 (vap->iv_opmode == IEEE80211_M_STA ? 1121 !IEEE80211_KEY_UNDEFINED(key) : 1122 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1123 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1124 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1125 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1126 eh.ether_dhost, 1127 "%s", "enmic failed, discard frame"); 1128 vap->iv_stats.is_crypto_enmicfail++; 1129 goto bad; 1130 } 1131 } 1132 } 1133 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1134 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1135 goto bad; 1136 1137 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1138 1139 IEEE80211_NODE_STAT(ni, tx_data); 1140 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1141 IEEE80211_NODE_STAT(ni, tx_mcast); 1142 m->m_flags |= M_MCAST; 1143 } else 1144 IEEE80211_NODE_STAT(ni, tx_ucast); 1145 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1146 1147 return m; 1148bad: 1149 if (m != NULL) 1150 m_freem(m); 1151 return NULL; 1152#undef WH4 1153} 1154 1155/* 1156 * Fragment the frame according to the specified mtu. 1157 * The size of the 802.11 header (w/o padding) is provided 1158 * so we don't need to recalculate it. We create a new 1159 * mbuf for each fragment and chain it through m_nextpkt; 1160 * we might be able to optimize this by reusing the original 1161 * packet's mbufs but that is significantly more complicated. 1162 */ 1163static int 1164ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1165 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1166{ 1167 struct ieee80211_frame *wh, *whf; 1168 struct mbuf *m, *prev, *next; 1169 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1170 1171 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1172 KASSERT(m0->m_pkthdr.len > mtu, 1173 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1174 1175 wh = mtod(m0, struct ieee80211_frame *); 1176 /* NB: mark the first frag; it will be propagated below */ 1177 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1178 totalhdrsize = hdrsize + ciphdrsize; 1179 fragno = 1; 1180 off = mtu - ciphdrsize; 1181 remainder = m0->m_pkthdr.len - off; 1182 prev = m0; 1183 do { 1184 fragsize = totalhdrsize + remainder; 1185 if (fragsize > mtu) 1186 fragsize = mtu; 1187 /* XXX fragsize can be >2048! */ 1188 KASSERT(fragsize < MCLBYTES, 1189 ("fragment size %u too big!", fragsize)); 1190 if (fragsize > MHLEN) 1191 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1192 else 1193 m = m_gethdr(M_DONTWAIT, MT_DATA); 1194 if (m == NULL) 1195 goto bad; 1196 /* leave room to prepend any cipher header */ 1197 m_align(m, fragsize - ciphdrsize); 1198 1199 /* 1200 * Form the header in the fragment. Note that since 1201 * we mark the first fragment with the MORE_FRAG bit 1202 * it automatically is propagated to each fragment; we 1203 * need only clear it on the last fragment (done below). 1204 */ 1205 whf = mtod(m, struct ieee80211_frame *); 1206 memcpy(whf, wh, hdrsize); 1207 *(uint16_t *)&whf->i_seq[0] |= htole16( 1208 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1209 IEEE80211_SEQ_FRAG_SHIFT); 1210 fragno++; 1211 1212 payload = fragsize - totalhdrsize; 1213 /* NB: destination is known to be contiguous */ 1214 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1215 m->m_len = hdrsize + payload; 1216 m->m_pkthdr.len = hdrsize + payload; 1217 m->m_flags |= M_FRAG; 1218 1219 /* chain up the fragment */ 1220 prev->m_nextpkt = m; 1221 prev = m; 1222 1223 /* deduct fragment just formed */ 1224 remainder -= payload; 1225 off += payload; 1226 } while (remainder != 0); 1227 1228 /* set the last fragment */ 1229 m->m_flags |= M_LASTFRAG; 1230 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1231 1232 /* strip first mbuf now that everything has been copied */ 1233 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1234 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1235 1236 vap->iv_stats.is_tx_fragframes++; 1237 vap->iv_stats.is_tx_frags += fragno-1; 1238 1239 return 1; 1240bad: 1241 /* reclaim fragments but leave original frame for caller to free */ 1242 for (m = m0->m_nextpkt; m != NULL; m = next) { 1243 next = m->m_nextpkt; 1244 m->m_nextpkt = NULL; /* XXX paranoid */ 1245 m_freem(m); 1246 } 1247 m0->m_nextpkt = NULL; 1248 return 0; 1249} 1250 1251/* 1252 * Add a supported rates element id to a frame. 1253 */ 1254static uint8_t * 1255ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1256{ 1257 int nrates; 1258 1259 *frm++ = IEEE80211_ELEMID_RATES; 1260 nrates = rs->rs_nrates; 1261 if (nrates > IEEE80211_RATE_SIZE) 1262 nrates = IEEE80211_RATE_SIZE; 1263 *frm++ = nrates; 1264 memcpy(frm, rs->rs_rates, nrates); 1265 return frm + nrates; 1266} 1267 1268/* 1269 * Add an extended supported rates element id to a frame. 1270 */ 1271static uint8_t * 1272ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1273{ 1274 /* 1275 * Add an extended supported rates element if operating in 11g mode. 1276 */ 1277 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1278 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1279 *frm++ = IEEE80211_ELEMID_XRATES; 1280 *frm++ = nrates; 1281 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1282 frm += nrates; 1283 } 1284 return frm; 1285} 1286 1287/* 1288 * Add an ssid element to a frame. 1289 */ 1290static uint8_t * 1291ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1292{ 1293 *frm++ = IEEE80211_ELEMID_SSID; 1294 *frm++ = len; 1295 memcpy(frm, ssid, len); 1296 return frm + len; 1297} 1298 1299/* 1300 * Add an erp element to a frame. 1301 */ 1302static uint8_t * 1303ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1304{ 1305 uint8_t erp; 1306 1307 *frm++ = IEEE80211_ELEMID_ERP; 1308 *frm++ = 1; 1309 erp = 0; 1310 if (ic->ic_nonerpsta != 0) 1311 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1312 if (ic->ic_flags & IEEE80211_F_USEPROT) 1313 erp |= IEEE80211_ERP_USE_PROTECTION; 1314 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1315 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1316 *frm++ = erp; 1317 return frm; 1318} 1319 1320/* 1321 * Add a CFParams element to a frame. 1322 */ 1323static uint8_t * 1324ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1325{ 1326#define ADDSHORT(frm, v) do { \ 1327 frm[0] = (v) & 0xff; \ 1328 frm[1] = (v) >> 8; \ 1329 frm += 2; \ 1330} while (0) 1331 *frm++ = IEEE80211_ELEMID_CFPARMS; 1332 *frm++ = 6; 1333 *frm++ = 0; /* CFP count */ 1334 *frm++ = 2; /* CFP period */ 1335 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1336 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1337 return frm; 1338#undef ADDSHORT 1339} 1340 1341static __inline uint8_t * 1342add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1343{ 1344 memcpy(frm, ie->ie_data, ie->ie_len); 1345 return frm + ie->ie_len; 1346} 1347 1348static __inline uint8_t * 1349add_ie(uint8_t *frm, const uint8_t *ie) 1350{ 1351 memcpy(frm, ie, 2 + ie[1]); 1352 return frm + 2 + ie[1]; 1353} 1354 1355#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1356/* 1357 * Add a WME information element to a frame. 1358 */ 1359static uint8_t * 1360ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1361{ 1362 static const struct ieee80211_wme_info info = { 1363 .wme_id = IEEE80211_ELEMID_VENDOR, 1364 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1365 .wme_oui = { WME_OUI_BYTES }, 1366 .wme_type = WME_OUI_TYPE, 1367 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1368 .wme_version = WME_VERSION, 1369 .wme_info = 0, 1370 }; 1371 memcpy(frm, &info, sizeof(info)); 1372 return frm + sizeof(info); 1373} 1374 1375/* 1376 * Add a WME parameters element to a frame. 1377 */ 1378static uint8_t * 1379ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1380{ 1381#define SM(_v, _f) (((_v) << _f##_S) & _f) 1382#define ADDSHORT(frm, v) do { \ 1383 frm[0] = (v) & 0xff; \ 1384 frm[1] = (v) >> 8; \ 1385 frm += 2; \ 1386} while (0) 1387 /* NB: this works 'cuz a param has an info at the front */ 1388 static const struct ieee80211_wme_info param = { 1389 .wme_id = IEEE80211_ELEMID_VENDOR, 1390 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1391 .wme_oui = { WME_OUI_BYTES }, 1392 .wme_type = WME_OUI_TYPE, 1393 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1394 .wme_version = WME_VERSION, 1395 }; 1396 int i; 1397 1398 memcpy(frm, ¶m, sizeof(param)); 1399 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1400 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1401 *frm++ = 0; /* reserved field */ 1402 for (i = 0; i < WME_NUM_AC; i++) { 1403 const struct wmeParams *ac = 1404 &wme->wme_bssChanParams.cap_wmeParams[i]; 1405 *frm++ = SM(i, WME_PARAM_ACI) 1406 | SM(ac->wmep_acm, WME_PARAM_ACM) 1407 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1408 ; 1409 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1410 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1411 ; 1412 ADDSHORT(frm, ac->wmep_txopLimit); 1413 } 1414 return frm; 1415#undef SM 1416#undef ADDSHORT 1417} 1418#undef WME_OUI_BYTES 1419 1420/* 1421 * Add an 11h Power Constraint element to a frame. 1422 */ 1423static uint8_t * 1424ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1425{ 1426 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1427 /* XXX per-vap tx power limit? */ 1428 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1429 1430 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1431 frm[1] = 1; 1432 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1433 return frm + 3; 1434} 1435 1436/* 1437 * Add an 11h Power Capability element to a frame. 1438 */ 1439static uint8_t * 1440ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1441{ 1442 frm[0] = IEEE80211_ELEMID_PWRCAP; 1443 frm[1] = 2; 1444 frm[2] = c->ic_minpower; 1445 frm[3] = c->ic_maxpower; 1446 return frm + 4; 1447} 1448 1449/* 1450 * Add an 11h Supported Channels element to a frame. 1451 */ 1452static uint8_t * 1453ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1454{ 1455 static const int ielen = 26; 1456 1457 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1458 frm[1] = ielen; 1459 /* XXX not correct */ 1460 memcpy(frm+2, ic->ic_chan_avail, ielen); 1461 return frm + 2 + ielen; 1462} 1463 1464/* 1465 * Add an 11h Channel Switch Announcement element to a frame. 1466 * Note that we use the per-vap CSA count to adjust the global 1467 * counter so we can use this routine to form probe response 1468 * frames and get the current count. 1469 */ 1470static uint8_t * 1471ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1472{ 1473 struct ieee80211com *ic = vap->iv_ic; 1474 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1475 1476 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1477 csa->csa_len = 3; 1478 csa->csa_mode = 1; /* XXX force quiet on channel */ 1479 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1480 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1481 return frm + sizeof(*csa); 1482} 1483 1484/* 1485 * Add an 11h country information element to a frame. 1486 */ 1487static uint8_t * 1488ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1489{ 1490 1491 if (ic->ic_countryie == NULL || 1492 ic->ic_countryie_chan != ic->ic_bsschan) { 1493 /* 1494 * Handle lazy construction of ie. This is done on 1495 * first use and after a channel change that requires 1496 * re-calculation. 1497 */ 1498 if (ic->ic_countryie != NULL) 1499 free(ic->ic_countryie, M_80211_NODE_IE); 1500 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1501 if (ic->ic_countryie == NULL) 1502 return frm; 1503 ic->ic_countryie_chan = ic->ic_bsschan; 1504 } 1505 return add_appie(frm, ic->ic_countryie); 1506} 1507 1508/* 1509 * Send a probe request frame with the specified ssid 1510 * and any optional information element data. 1511 */ 1512int 1513ieee80211_send_probereq(struct ieee80211_node *ni, 1514 const uint8_t sa[IEEE80211_ADDR_LEN], 1515 const uint8_t da[IEEE80211_ADDR_LEN], 1516 const uint8_t bssid[IEEE80211_ADDR_LEN], 1517 const uint8_t *ssid, size_t ssidlen) 1518{ 1519 struct ieee80211vap *vap = ni->ni_vap; 1520 struct ieee80211com *ic = ni->ni_ic; 1521 const struct ieee80211_txparam *tp; 1522 struct ieee80211_bpf_params params; 1523 struct ieee80211_frame *wh; 1524 const struct ieee80211_rateset *rs; 1525 struct mbuf *m; 1526 uint8_t *frm; 1527 1528 if (vap->iv_state == IEEE80211_S_CAC) { 1529 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1530 "block %s frame in CAC state", "probe request"); 1531 vap->iv_stats.is_tx_badstate++; 1532 return EIO; /* XXX */ 1533 } 1534 1535 /* 1536 * Hold a reference on the node so it doesn't go away until after 1537 * the xmit is complete all the way in the driver. On error we 1538 * will remove our reference. 1539 */ 1540 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1541 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1542 __func__, __LINE__, 1543 ni, ether_sprintf(ni->ni_macaddr), 1544 ieee80211_node_refcnt(ni)+1); 1545 ieee80211_ref_node(ni); 1546 1547 /* 1548 * prreq frame format 1549 * [tlv] ssid 1550 * [tlv] supported rates 1551 * [tlv] RSN (optional) 1552 * [tlv] extended supported rates 1553 * [tlv] WPA (optional) 1554 * [tlv] user-specified ie's 1555 */ 1556 m = ieee80211_getmgtframe(&frm, 1557 ic->ic_headroom + sizeof(struct ieee80211_frame), 1558 2 + IEEE80211_NWID_LEN 1559 + 2 + IEEE80211_RATE_SIZE 1560 + sizeof(struct ieee80211_ie_wpa) 1561 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1562 + sizeof(struct ieee80211_ie_wpa) 1563 + (vap->iv_appie_probereq != NULL ? 1564 vap->iv_appie_probereq->ie_len : 0) 1565 ); 1566 if (m == NULL) { 1567 vap->iv_stats.is_tx_nobuf++; 1568 ieee80211_free_node(ni); 1569 return ENOMEM; 1570 } 1571 1572 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1573 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1574 frm = ieee80211_add_rates(frm, rs); 1575 if (vap->iv_flags & IEEE80211_F_WPA2) { 1576 if (vap->iv_rsn_ie != NULL) 1577 frm = add_ie(frm, vap->iv_rsn_ie); 1578 /* XXX else complain? */ 1579 } 1580 frm = ieee80211_add_xrates(frm, rs); 1581 if (vap->iv_flags & IEEE80211_F_WPA1) { 1582 if (vap->iv_wpa_ie != NULL) 1583 frm = add_ie(frm, vap->iv_wpa_ie); 1584 /* XXX else complain? */ 1585 } 1586 if (vap->iv_appie_probereq != NULL) 1587 frm = add_appie(frm, vap->iv_appie_probereq); 1588 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1589 1590 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1591 ("leading space %zd", M_LEADINGSPACE(m))); 1592 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1593 if (m == NULL) { 1594 /* NB: cannot happen */ 1595 ieee80211_free_node(ni); 1596 return ENOMEM; 1597 } 1598 1599 wh = mtod(m, struct ieee80211_frame *); 1600 ieee80211_send_setup(ni, m, 1601 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1602 IEEE80211_NONQOS_TID, sa, da, bssid); 1603 /* XXX power management? */ 1604 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1605 1606 M_WME_SETAC(m, WME_AC_BE); 1607 1608 IEEE80211_NODE_STAT(ni, tx_probereq); 1609 IEEE80211_NODE_STAT(ni, tx_mgmt); 1610 1611 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1612 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1613 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1614 ssidlen, ssid); 1615 1616 memset(¶ms, 0, sizeof(params)); 1617 params.ibp_pri = M_WME_GETAC(m); 1618 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1619 params.ibp_rate0 = tp->mgmtrate; 1620 if (IEEE80211_IS_MULTICAST(da)) { 1621 params.ibp_flags |= IEEE80211_BPF_NOACK; 1622 params.ibp_try0 = 1; 1623 } else 1624 params.ibp_try0 = tp->maxretry; 1625 params.ibp_power = ni->ni_txpower; 1626 return ic->ic_raw_xmit(ni, m, ¶ms); 1627} 1628 1629/* 1630 * Calculate capability information for mgt frames. 1631 */ 1632static uint16_t 1633getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1634{ 1635 struct ieee80211com *ic = vap->iv_ic; 1636 uint16_t capinfo; 1637 1638 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1639 1640 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1641 capinfo = IEEE80211_CAPINFO_ESS; 1642 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1643 capinfo = IEEE80211_CAPINFO_IBSS; 1644 else 1645 capinfo = 0; 1646 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1647 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1648 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1649 IEEE80211_IS_CHAN_2GHZ(chan)) 1650 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1651 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1652 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1653 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1654 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1655 return capinfo; 1656} 1657 1658/* 1659 * Send a management frame. The node is for the destination (or ic_bss 1660 * when in station mode). Nodes other than ic_bss have their reference 1661 * count bumped to reflect our use for an indeterminant time. 1662 */ 1663int 1664ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1665{ 1666#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1667#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1668 struct ieee80211vap *vap = ni->ni_vap; 1669 struct ieee80211com *ic = ni->ni_ic; 1670 struct ieee80211_node *bss = vap->iv_bss; 1671 struct ieee80211_bpf_params params; 1672 struct mbuf *m; 1673 uint8_t *frm; 1674 uint16_t capinfo; 1675 int has_challenge, is_shared_key, ret, status; 1676 1677 KASSERT(ni != NULL, ("null node")); 1678 1679 /* 1680 * Hold a reference on the node so it doesn't go away until after 1681 * the xmit is complete all the way in the driver. On error we 1682 * will remove our reference. 1683 */ 1684 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1685 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1686 __func__, __LINE__, 1687 ni, ether_sprintf(ni->ni_macaddr), 1688 ieee80211_node_refcnt(ni)+1); 1689 ieee80211_ref_node(ni); 1690 1691 memset(¶ms, 0, sizeof(params)); 1692 switch (type) { 1693 1694 case IEEE80211_FC0_SUBTYPE_AUTH: 1695 status = arg >> 16; 1696 arg &= 0xffff; 1697 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1698 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1699 ni->ni_challenge != NULL); 1700 1701 /* 1702 * Deduce whether we're doing open authentication or 1703 * shared key authentication. We do the latter if 1704 * we're in the middle of a shared key authentication 1705 * handshake or if we're initiating an authentication 1706 * request and configured to use shared key. 1707 */ 1708 is_shared_key = has_challenge || 1709 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1710 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1711 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1712 1713 m = ieee80211_getmgtframe(&frm, 1714 ic->ic_headroom + sizeof(struct ieee80211_frame), 1715 3 * sizeof(uint16_t) 1716 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1717 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1718 ); 1719 if (m == NULL) 1720 senderr(ENOMEM, is_tx_nobuf); 1721 1722 ((uint16_t *)frm)[0] = 1723 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1724 : htole16(IEEE80211_AUTH_ALG_OPEN); 1725 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1726 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1727 1728 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1729 ((uint16_t *)frm)[3] = 1730 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1731 IEEE80211_ELEMID_CHALLENGE); 1732 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1733 IEEE80211_CHALLENGE_LEN); 1734 m->m_pkthdr.len = m->m_len = 1735 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1736 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1737 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1738 "request encrypt frame (%s)", __func__); 1739 /* mark frame for encryption */ 1740 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1741 } 1742 } else 1743 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1744 1745 /* XXX not right for shared key */ 1746 if (status == IEEE80211_STATUS_SUCCESS) 1747 IEEE80211_NODE_STAT(ni, tx_auth); 1748 else 1749 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1750 1751 if (vap->iv_opmode == IEEE80211_M_STA) 1752 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1753 (void *) vap->iv_state); 1754 break; 1755 1756 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1757 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1758 "send station deauthenticate (reason %d)", arg); 1759 m = ieee80211_getmgtframe(&frm, 1760 ic->ic_headroom + sizeof(struct ieee80211_frame), 1761 sizeof(uint16_t)); 1762 if (m == NULL) 1763 senderr(ENOMEM, is_tx_nobuf); 1764 *(uint16_t *)frm = htole16(arg); /* reason */ 1765 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1766 1767 IEEE80211_NODE_STAT(ni, tx_deauth); 1768 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1769 1770 ieee80211_node_unauthorize(ni); /* port closed */ 1771 break; 1772 1773 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1774 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1775 /* 1776 * asreq frame format 1777 * [2] capability information 1778 * [2] listen interval 1779 * [6*] current AP address (reassoc only) 1780 * [tlv] ssid 1781 * [tlv] supported rates 1782 * [tlv] extended supported rates 1783 * [4] power capability (optional) 1784 * [28] supported channels (optional) 1785 * [tlv] HT capabilities 1786 * [tlv] WME (optional) 1787 * [tlv] Vendor OUI HT capabilities (optional) 1788 * [tlv] Atheros capabilities (if negotiated) 1789 * [tlv] AppIE's (optional) 1790 */ 1791 m = ieee80211_getmgtframe(&frm, 1792 ic->ic_headroom + sizeof(struct ieee80211_frame), 1793 sizeof(uint16_t) 1794 + sizeof(uint16_t) 1795 + IEEE80211_ADDR_LEN 1796 + 2 + IEEE80211_NWID_LEN 1797 + 2 + IEEE80211_RATE_SIZE 1798 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1799 + 4 1800 + 2 + 26 1801 + sizeof(struct ieee80211_wme_info) 1802 + sizeof(struct ieee80211_ie_htcap) 1803 + 4 + sizeof(struct ieee80211_ie_htcap) 1804#ifdef IEEE80211_SUPPORT_SUPERG 1805 + sizeof(struct ieee80211_ath_ie) 1806#endif 1807 + (vap->iv_appie_wpa != NULL ? 1808 vap->iv_appie_wpa->ie_len : 0) 1809 + (vap->iv_appie_assocreq != NULL ? 1810 vap->iv_appie_assocreq->ie_len : 0) 1811 ); 1812 if (m == NULL) 1813 senderr(ENOMEM, is_tx_nobuf); 1814 1815 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1816 ("wrong mode %u", vap->iv_opmode)); 1817 capinfo = IEEE80211_CAPINFO_ESS; 1818 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1819 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1820 /* 1821 * NB: Some 11a AP's reject the request when 1822 * short premable is set. 1823 */ 1824 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1825 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1826 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1827 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1828 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1829 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1830 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1831 (vap->iv_flags & IEEE80211_F_DOTH)) 1832 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1833 *(uint16_t *)frm = htole16(capinfo); 1834 frm += 2; 1835 1836 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1837 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1838 bss->ni_intval)); 1839 frm += 2; 1840 1841 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1842 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1843 frm += IEEE80211_ADDR_LEN; 1844 } 1845 1846 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1847 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1848 if (vap->iv_flags & IEEE80211_F_WPA2) { 1849 if (vap->iv_rsn_ie != NULL) 1850 frm = add_ie(frm, vap->iv_rsn_ie); 1851 /* XXX else complain? */ 1852 } 1853 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1854 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1855 frm = ieee80211_add_powercapability(frm, 1856 ic->ic_curchan); 1857 frm = ieee80211_add_supportedchannels(frm, ic); 1858 } 1859 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1860 ni->ni_ies.htcap_ie != NULL && 1861 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1862 frm = ieee80211_add_htcap(frm, ni); 1863 if (vap->iv_flags & IEEE80211_F_WPA1) { 1864 if (vap->iv_wpa_ie != NULL) 1865 frm = add_ie(frm, vap->iv_wpa_ie); 1866 /* XXX else complain */ 1867 } 1868 if ((ic->ic_flags & IEEE80211_F_WME) && 1869 ni->ni_ies.wme_ie != NULL) 1870 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1871 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1872 ni->ni_ies.htcap_ie != NULL && 1873 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1874 frm = ieee80211_add_htcap_vendor(frm, ni); 1875#ifdef IEEE80211_SUPPORT_SUPERG 1876 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 1877 frm = ieee80211_add_ath(frm, 1878 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1879 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1880 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1881 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1882 } 1883#endif /* IEEE80211_SUPPORT_SUPERG */ 1884 if (vap->iv_appie_assocreq != NULL) 1885 frm = add_appie(frm, vap->iv_appie_assocreq); 1886 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1887 1888 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1889 (void *) vap->iv_state); 1890 break; 1891 1892 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1893 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1894 /* 1895 * asresp frame format 1896 * [2] capability information 1897 * [2] status 1898 * [2] association ID 1899 * [tlv] supported rates 1900 * [tlv] extended supported rates 1901 * [tlv] HT capabilities (standard, if STA enabled) 1902 * [tlv] HT information (standard, if STA enabled) 1903 * [tlv] WME (if configured and STA enabled) 1904 * [tlv] HT capabilities (vendor OUI, if STA enabled) 1905 * [tlv] HT information (vendor OUI, if STA enabled) 1906 * [tlv] Atheros capabilities (if STA enabled) 1907 * [tlv] AppIE's (optional) 1908 */ 1909 m = ieee80211_getmgtframe(&frm, 1910 ic->ic_headroom + sizeof(struct ieee80211_frame), 1911 sizeof(uint16_t) 1912 + sizeof(uint16_t) 1913 + sizeof(uint16_t) 1914 + 2 + IEEE80211_RATE_SIZE 1915 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1916 + sizeof(struct ieee80211_ie_htcap) + 4 1917 + sizeof(struct ieee80211_ie_htinfo) + 4 1918 + sizeof(struct ieee80211_wme_param) 1919#ifdef IEEE80211_SUPPORT_SUPERG 1920 + sizeof(struct ieee80211_ath_ie) 1921#endif 1922 + (vap->iv_appie_assocresp != NULL ? 1923 vap->iv_appie_assocresp->ie_len : 0) 1924 ); 1925 if (m == NULL) 1926 senderr(ENOMEM, is_tx_nobuf); 1927 1928 capinfo = getcapinfo(vap, bss->ni_chan); 1929 *(uint16_t *)frm = htole16(capinfo); 1930 frm += 2; 1931 1932 *(uint16_t *)frm = htole16(arg); /* status */ 1933 frm += 2; 1934 1935 if (arg == IEEE80211_STATUS_SUCCESS) { 1936 *(uint16_t *)frm = htole16(ni->ni_associd); 1937 IEEE80211_NODE_STAT(ni, tx_assoc); 1938 } else 1939 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 1940 frm += 2; 1941 1942 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1943 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1944 /* NB: respond according to what we received */ 1945 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 1946 frm = ieee80211_add_htcap(frm, ni); 1947 frm = ieee80211_add_htinfo(frm, ni); 1948 } 1949 if ((vap->iv_flags & IEEE80211_F_WME) && 1950 ni->ni_ies.wme_ie != NULL) 1951 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1952 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 1953 frm = ieee80211_add_htcap_vendor(frm, ni); 1954 frm = ieee80211_add_htinfo_vendor(frm, ni); 1955 } 1956#ifdef IEEE80211_SUPPORT_SUPERG 1957 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1958 frm = ieee80211_add_ath(frm, 1959 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1960 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 1961 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 1962 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 1963#endif /* IEEE80211_SUPPORT_SUPERG */ 1964 if (vap->iv_appie_assocresp != NULL) 1965 frm = add_appie(frm, vap->iv_appie_assocresp); 1966 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1967 break; 1968 1969 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1970 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1971 "send station disassociate (reason %d)", arg); 1972 m = ieee80211_getmgtframe(&frm, 1973 ic->ic_headroom + sizeof(struct ieee80211_frame), 1974 sizeof(uint16_t)); 1975 if (m == NULL) 1976 senderr(ENOMEM, is_tx_nobuf); 1977 *(uint16_t *)frm = htole16(arg); /* reason */ 1978 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1979 1980 IEEE80211_NODE_STAT(ni, tx_disassoc); 1981 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 1982 break; 1983 1984 default: 1985 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 1986 "invalid mgmt frame type %u", type); 1987 senderr(EINVAL, is_tx_unknownmgt); 1988 /* NOTREACHED */ 1989 } 1990 1991 /* NB: force non-ProbeResp frames to the highest queue */ 1992 params.ibp_pri = WME_AC_VO; 1993 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 1994 /* NB: we know all frames are unicast */ 1995 params.ibp_try0 = bss->ni_txparms->maxretry; 1996 params.ibp_power = bss->ni_txpower; 1997 return ieee80211_mgmt_output(ni, m, type, ¶ms); 1998bad: 1999 ieee80211_free_node(ni); 2000 return ret; 2001#undef senderr 2002#undef HTFLAGS 2003} 2004 2005/* 2006 * Return an mbuf with a probe response frame in it. 2007 * Space is left to prepend and 802.11 header at the 2008 * front but it's left to the caller to fill in. 2009 */ 2010struct mbuf * 2011ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2012{ 2013 struct ieee80211vap *vap = bss->ni_vap; 2014 struct ieee80211com *ic = bss->ni_ic; 2015 const struct ieee80211_rateset *rs; 2016 struct mbuf *m; 2017 uint16_t capinfo; 2018 uint8_t *frm; 2019 2020 /* 2021 * probe response frame format 2022 * [8] time stamp 2023 * [2] beacon interval 2024 * [2] cabability information 2025 * [tlv] ssid 2026 * [tlv] supported rates 2027 * [tlv] parameter set (FH/DS) 2028 * [tlv] parameter set (IBSS) 2029 * [tlv] country (optional) 2030 * [3] power control (optional) 2031 * [5] channel switch announcement (CSA) (optional) 2032 * [tlv] extended rate phy (ERP) 2033 * [tlv] extended supported rates 2034 * [tlv] RSN (optional) 2035 * [tlv] HT capabilities 2036 * [tlv] HT information 2037 * [tlv] WPA (optional) 2038 * [tlv] WME (optional) 2039 * [tlv] Vendor OUI HT capabilities (optional) 2040 * [tlv] Vendor OUI HT information (optional) 2041 * [tlv] Atheros capabilities 2042 * [tlv] AppIE's (optional) 2043 */ 2044 m = ieee80211_getmgtframe(&frm, 2045 ic->ic_headroom + sizeof(struct ieee80211_frame), 2046 8 2047 + sizeof(uint16_t) 2048 + sizeof(uint16_t) 2049 + 2 + IEEE80211_NWID_LEN 2050 + 2 + IEEE80211_RATE_SIZE 2051 + 7 /* max(7,3) */ 2052 + IEEE80211_COUNTRY_MAX_SIZE 2053 + 3 2054 + sizeof(struct ieee80211_csa_ie) 2055 + 3 2056 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2057 + sizeof(struct ieee80211_ie_wpa) 2058 + sizeof(struct ieee80211_ie_htcap) 2059 + sizeof(struct ieee80211_ie_htinfo) 2060 + sizeof(struct ieee80211_ie_wpa) 2061 + sizeof(struct ieee80211_wme_param) 2062 + 4 + sizeof(struct ieee80211_ie_htcap) 2063 + 4 + sizeof(struct ieee80211_ie_htinfo) 2064#ifdef IEEE80211_SUPPORT_SUPERG 2065 + sizeof(struct ieee80211_ath_ie) 2066#endif 2067 + (vap->iv_appie_proberesp != NULL ? 2068 vap->iv_appie_proberesp->ie_len : 0) 2069 ); 2070 if (m == NULL) { 2071 vap->iv_stats.is_tx_nobuf++; 2072 return NULL; 2073 } 2074 2075 memset(frm, 0, 8); /* timestamp should be filled later */ 2076 frm += 8; 2077 *(uint16_t *)frm = htole16(bss->ni_intval); 2078 frm += 2; 2079 capinfo = getcapinfo(vap, bss->ni_chan); 2080 *(uint16_t *)frm = htole16(capinfo); 2081 frm += 2; 2082 2083 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2084 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2085 frm = ieee80211_add_rates(frm, rs); 2086 2087 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2088 *frm++ = IEEE80211_ELEMID_FHPARMS; 2089 *frm++ = 5; 2090 *frm++ = bss->ni_fhdwell & 0x00ff; 2091 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2092 *frm++ = IEEE80211_FH_CHANSET( 2093 ieee80211_chan2ieee(ic, bss->ni_chan)); 2094 *frm++ = IEEE80211_FH_CHANPAT( 2095 ieee80211_chan2ieee(ic, bss->ni_chan)); 2096 *frm++ = bss->ni_fhindex; 2097 } else { 2098 *frm++ = IEEE80211_ELEMID_DSPARMS; 2099 *frm++ = 1; 2100 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2101 } 2102 2103 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2104 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2105 *frm++ = 2; 2106 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2107 } 2108 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2109 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2110 frm = ieee80211_add_countryie(frm, ic); 2111 if (vap->iv_flags & IEEE80211_F_DOTH) { 2112 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2113 frm = ieee80211_add_powerconstraint(frm, vap); 2114 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2115 frm = ieee80211_add_csa(frm, vap); 2116 } 2117 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2118 frm = ieee80211_add_erp(frm, ic); 2119 frm = ieee80211_add_xrates(frm, rs); 2120 if (vap->iv_flags & IEEE80211_F_WPA2) { 2121 if (vap->iv_rsn_ie != NULL) 2122 frm = add_ie(frm, vap->iv_rsn_ie); 2123 /* XXX else complain? */ 2124 } 2125 /* 2126 * NB: legacy 11b clients do not get certain ie's. 2127 * The caller identifies such clients by passing 2128 * a token in legacy to us. Could expand this to be 2129 * any legacy client for stuff like HT ie's. 2130 */ 2131 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2132 legacy != IEEE80211_SEND_LEGACY_11B) { 2133 frm = ieee80211_add_htcap(frm, bss); 2134 frm = ieee80211_add_htinfo(frm, bss); 2135 } 2136 if (vap->iv_flags & IEEE80211_F_WPA1) { 2137 if (vap->iv_wpa_ie != NULL) 2138 frm = add_ie(frm, vap->iv_wpa_ie); 2139 /* XXX else complain? */ 2140 } 2141 if (vap->iv_flags & IEEE80211_F_WME) 2142 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2143 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2144 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2145 legacy != IEEE80211_SEND_LEGACY_11B) { 2146 frm = ieee80211_add_htcap_vendor(frm, bss); 2147 frm = ieee80211_add_htinfo_vendor(frm, bss); 2148 } 2149#ifdef IEEE80211_SUPPORT_SUPERG 2150 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2151 legacy != IEEE80211_SEND_LEGACY_11B) 2152 frm = ieee80211_add_athcaps(frm, bss); 2153#endif 2154 if (vap->iv_appie_proberesp != NULL) 2155 frm = add_appie(frm, vap->iv_appie_proberesp); 2156 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2157 2158 return m; 2159} 2160 2161/* 2162 * Send a probe response frame to the specified mac address. 2163 * This does not go through the normal mgt frame api so we 2164 * can specify the destination address and re-use the bss node 2165 * for the sta reference. 2166 */ 2167int 2168ieee80211_send_proberesp(struct ieee80211vap *vap, 2169 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2170{ 2171 struct ieee80211_node *bss = vap->iv_bss; 2172 struct ieee80211com *ic = vap->iv_ic; 2173 struct ieee80211_frame *wh; 2174 struct mbuf *m; 2175 2176 if (vap->iv_state == IEEE80211_S_CAC) { 2177 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2178 "block %s frame in CAC state", "probe response"); 2179 vap->iv_stats.is_tx_badstate++; 2180 return EIO; /* XXX */ 2181 } 2182 2183 /* 2184 * Hold a reference on the node so it doesn't go away until after 2185 * the xmit is complete all the way in the driver. On error we 2186 * will remove our reference. 2187 */ 2188 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2189 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2190 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2191 ieee80211_node_refcnt(bss)+1); 2192 ieee80211_ref_node(bss); 2193 2194 m = ieee80211_alloc_proberesp(bss, legacy); 2195 if (m == NULL) { 2196 ieee80211_free_node(bss); 2197 return ENOMEM; 2198 } 2199 2200 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2201 KASSERT(m != NULL, ("no room for header")); 2202 2203 wh = mtod(m, struct ieee80211_frame *); 2204 ieee80211_send_setup(bss, m, 2205 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2206 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2207 /* XXX power management? */ 2208 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2209 2210 M_WME_SETAC(m, WME_AC_BE); 2211 2212 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2213 "send probe resp on channel %u to %s%s\n", 2214 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2215 legacy ? " <legacy>" : ""); 2216 IEEE80211_NODE_STAT(bss, tx_mgmt); 2217 2218 return ic->ic_raw_xmit(bss, m, NULL); 2219} 2220 2221/* 2222 * Allocate and build a RTS (Request To Send) control frame. 2223 */ 2224struct mbuf * 2225ieee80211_alloc_rts(struct ieee80211com *ic, 2226 const uint8_t ra[IEEE80211_ADDR_LEN], 2227 const uint8_t ta[IEEE80211_ADDR_LEN], 2228 uint16_t dur) 2229{ 2230 struct ieee80211_frame_rts *rts; 2231 struct mbuf *m; 2232 2233 /* XXX honor ic_headroom */ 2234 m = m_gethdr(M_DONTWAIT, MT_DATA); 2235 if (m != NULL) { 2236 rts = mtod(m, struct ieee80211_frame_rts *); 2237 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2238 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2239 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2240 *(u_int16_t *)rts->i_dur = htole16(dur); 2241 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2242 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2243 2244 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2245 } 2246 return m; 2247} 2248 2249/* 2250 * Allocate and build a CTS (Clear To Send) control frame. 2251 */ 2252struct mbuf * 2253ieee80211_alloc_cts(struct ieee80211com *ic, 2254 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2255{ 2256 struct ieee80211_frame_cts *cts; 2257 struct mbuf *m; 2258 2259 /* XXX honor ic_headroom */ 2260 m = m_gethdr(M_DONTWAIT, MT_DATA); 2261 if (m != NULL) { 2262 cts = mtod(m, struct ieee80211_frame_cts *); 2263 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2264 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2265 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2266 *(u_int16_t *)cts->i_dur = htole16(dur); 2267 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2268 2269 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2270 } 2271 return m; 2272} 2273 2274static void 2275ieee80211_tx_mgt_timeout(void *arg) 2276{ 2277 struct ieee80211_node *ni = arg; 2278 struct ieee80211vap *vap = ni->ni_vap; 2279 2280 if (vap->iv_state != IEEE80211_S_INIT && 2281 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2282 /* 2283 * NB: it's safe to specify a timeout as the reason here; 2284 * it'll only be used in the right state. 2285 */ 2286 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2287 IEEE80211_SCAN_FAIL_TIMEOUT); 2288 } 2289} 2290 2291static void 2292ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2293{ 2294 struct ieee80211vap *vap = ni->ni_vap; 2295 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2296 2297 /* 2298 * Frame transmit completed; arrange timer callback. If 2299 * transmit was successfuly we wait for response. Otherwise 2300 * we arrange an immediate callback instead of doing the 2301 * callback directly since we don't know what state the driver 2302 * is in (e.g. what locks it is holding). This work should 2303 * not be too time-critical and not happen too often so the 2304 * added overhead is acceptable. 2305 * 2306 * XXX what happens if !acked but response shows up before callback? 2307 */ 2308 if (vap->iv_state == ostate) 2309 callout_reset(&vap->iv_mgtsend, 2310 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2311 ieee80211_tx_mgt_timeout, ni); 2312} 2313 2314static void 2315ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2316 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2317{ 2318 struct ieee80211vap *vap = ni->ni_vap; 2319 struct ieee80211com *ic = ni->ni_ic; 2320 struct ieee80211_rateset *rs = &ni->ni_rates; 2321 uint16_t capinfo; 2322 2323 /* 2324 * beacon frame format 2325 * [8] time stamp 2326 * [2] beacon interval 2327 * [2] cabability information 2328 * [tlv] ssid 2329 * [tlv] supported rates 2330 * [3] parameter set (DS) 2331 * [8] CF parameter set (optional) 2332 * [tlv] parameter set (IBSS/TIM) 2333 * [tlv] country (optional) 2334 * [3] power control (optional) 2335 * [5] channel switch announcement (CSA) (optional) 2336 * [tlv] extended rate phy (ERP) 2337 * [tlv] extended supported rates 2338 * [tlv] RSN parameters 2339 * [tlv] HT capabilities 2340 * [tlv] HT information 2341 * XXX Vendor-specific OIDs (e.g. Atheros) 2342 * [tlv] WPA parameters 2343 * [tlv] WME parameters 2344 * [tlv] Vendor OUI HT capabilities (optional) 2345 * [tlv] Vendor OUI HT information (optional) 2346 * [tlv] Atheros capabilities (optional) 2347 * [tlv] TDMA parameters (optional) 2348 * [tlv] application data (optional) 2349 */ 2350 2351 memset(bo, 0, sizeof(*bo)); 2352 2353 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2354 frm += 8; 2355 *(uint16_t *)frm = htole16(ni->ni_intval); 2356 frm += 2; 2357 capinfo = getcapinfo(vap, ni->ni_chan); 2358 bo->bo_caps = (uint16_t *)frm; 2359 *(uint16_t *)frm = htole16(capinfo); 2360 frm += 2; 2361 *frm++ = IEEE80211_ELEMID_SSID; 2362 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2363 *frm++ = ni->ni_esslen; 2364 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2365 frm += ni->ni_esslen; 2366 } else 2367 *frm++ = 0; 2368 frm = ieee80211_add_rates(frm, rs); 2369 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2370 *frm++ = IEEE80211_ELEMID_DSPARMS; 2371 *frm++ = 1; 2372 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2373 } 2374 if (ic->ic_flags & IEEE80211_F_PCF) { 2375 bo->bo_cfp = frm; 2376 frm = ieee80211_add_cfparms(frm, ic); 2377 } 2378 bo->bo_tim = frm; 2379 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2380 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2381 *frm++ = 2; 2382 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2383 bo->bo_tim_len = 0; 2384 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2385 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2386 2387 tie->tim_ie = IEEE80211_ELEMID_TIM; 2388 tie->tim_len = 4; /* length */ 2389 tie->tim_count = 0; /* DTIM count */ 2390 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2391 tie->tim_bitctl = 0; /* bitmap control */ 2392 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2393 frm += sizeof(struct ieee80211_tim_ie); 2394 bo->bo_tim_len = 1; 2395 } 2396 bo->bo_tim_trailer = frm; 2397 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2398 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2399 frm = ieee80211_add_countryie(frm, ic); 2400 if (vap->iv_flags & IEEE80211_F_DOTH) { 2401 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2402 frm = ieee80211_add_powerconstraint(frm, vap); 2403 bo->bo_csa = frm; 2404 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2405 frm = ieee80211_add_csa(frm, vap); 2406 } else 2407 bo->bo_csa = frm; 2408 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2409 bo->bo_erp = frm; 2410 frm = ieee80211_add_erp(frm, ic); 2411 } 2412 frm = ieee80211_add_xrates(frm, rs); 2413 if (vap->iv_flags & IEEE80211_F_WPA2) { 2414 if (vap->iv_rsn_ie != NULL) 2415 frm = add_ie(frm, vap->iv_rsn_ie); 2416 /* XXX else complain */ 2417 } 2418 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2419 frm = ieee80211_add_htcap(frm, ni); 2420 bo->bo_htinfo = frm; 2421 frm = ieee80211_add_htinfo(frm, ni); 2422 } 2423 if (vap->iv_flags & IEEE80211_F_WPA1) { 2424 if (vap->iv_wpa_ie != NULL) 2425 frm = add_ie(frm, vap->iv_wpa_ie); 2426 /* XXX else complain */ 2427 } 2428 if (vap->iv_flags & IEEE80211_F_WME) { 2429 bo->bo_wme = frm; 2430 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2431 } 2432 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2433 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2434 frm = ieee80211_add_htcap_vendor(frm, ni); 2435 frm = ieee80211_add_htinfo_vendor(frm, ni); 2436 } 2437#ifdef IEEE80211_SUPPORT_SUPERG 2438 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2439 bo->bo_ath = frm; 2440 frm = ieee80211_add_athcaps(frm, ni); 2441 } 2442#endif 2443#ifdef IEEE80211_SUPPORT_TDMA 2444 if (vap->iv_caps & IEEE80211_C_TDMA) { 2445 bo->bo_tdma = frm; 2446 frm = ieee80211_add_tdma(frm, vap); 2447 } 2448#endif 2449 if (vap->iv_appie_beacon != NULL) { 2450 bo->bo_appie = frm; 2451 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2452 frm = add_appie(frm, vap->iv_appie_beacon); 2453 } 2454 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2455 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2456 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2457} 2458 2459/* 2460 * Allocate a beacon frame and fillin the appropriate bits. 2461 */ 2462struct mbuf * 2463ieee80211_beacon_alloc(struct ieee80211_node *ni, 2464 struct ieee80211_beacon_offsets *bo) 2465{ 2466 struct ieee80211vap *vap = ni->ni_vap; 2467 struct ieee80211com *ic = ni->ni_ic; 2468 struct ifnet *ifp = vap->iv_ifp; 2469 struct ieee80211_frame *wh; 2470 struct mbuf *m; 2471 int pktlen; 2472 uint8_t *frm; 2473 2474 /* 2475 * beacon frame format 2476 * [8] time stamp 2477 * [2] beacon interval 2478 * [2] cabability information 2479 * [tlv] ssid 2480 * [tlv] supported rates 2481 * [3] parameter set (DS) 2482 * [8] CF parameter set (optional) 2483 * [tlv] parameter set (IBSS/TIM) 2484 * [tlv] country (optional) 2485 * [3] power control (optional) 2486 * [5] channel switch announcement (CSA) (optional) 2487 * [tlv] extended rate phy (ERP) 2488 * [tlv] extended supported rates 2489 * [tlv] RSN parameters 2490 * [tlv] HT capabilities 2491 * [tlv] HT information 2492 * [tlv] Vendor OUI HT capabilities (optional) 2493 * [tlv] Vendor OUI HT information (optional) 2494 * XXX Vendor-specific OIDs (e.g. Atheros) 2495 * [tlv] WPA parameters 2496 * [tlv] WME parameters 2497 * [tlv] TDMA parameters (optional) 2498 * [tlv] application data (optional) 2499 * NB: we allocate the max space required for the TIM bitmap. 2500 * XXX how big is this? 2501 */ 2502 pktlen = 8 /* time stamp */ 2503 + sizeof(uint16_t) /* beacon interval */ 2504 + sizeof(uint16_t) /* capabilities */ 2505 + 2 + ni->ni_esslen /* ssid */ 2506 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2507 + 2 + 1 /* DS parameters */ 2508 + 2 + 6 /* CF parameters */ 2509 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2510 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2511 + 2 + 1 /* power control */ 2512 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2513 + 2 + 1 /* ERP */ 2514 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2515 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2516 2*sizeof(struct ieee80211_ie_wpa) : 0) 2517 /* XXX conditional? */ 2518 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2519 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2520 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2521 sizeof(struct ieee80211_wme_param) : 0) 2522#ifdef IEEE80211_SUPPORT_SUPERG 2523 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2524#endif 2525#ifdef IEEE80211_SUPPORT_TDMA 2526 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2527 sizeof(struct ieee80211_tdma_param) : 0) 2528#endif 2529 + IEEE80211_MAX_APPIE 2530 ; 2531 m = ieee80211_getmgtframe(&frm, 2532 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2533 if (m == NULL) { 2534 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2535 "%s: cannot get buf; size %u\n", __func__, pktlen); 2536 vap->iv_stats.is_tx_nobuf++; 2537 return NULL; 2538 } 2539 ieee80211_beacon_construct(m, frm, bo, ni); 2540 2541 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2542 KASSERT(m != NULL, ("no space for 802.11 header?")); 2543 wh = mtod(m, struct ieee80211_frame *); 2544 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2545 IEEE80211_FC0_SUBTYPE_BEACON; 2546 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2547 *(uint16_t *)wh->i_dur = 0; 2548 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2549 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2550 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2551 *(uint16_t *)wh->i_seq = 0; 2552 2553 return m; 2554} 2555 2556/* 2557 * Update the dynamic parts of a beacon frame based on the current state. 2558 */ 2559int 2560ieee80211_beacon_update(struct ieee80211_node *ni, 2561 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2562{ 2563 struct ieee80211vap *vap = ni->ni_vap; 2564 struct ieee80211com *ic = ni->ni_ic; 2565 int len_changed = 0; 2566 uint16_t capinfo; 2567 2568 IEEE80211_LOCK(ic); 2569 /* 2570 * Handle 11h channel change when we've reached the count. 2571 * We must recalculate the beacon frame contents to account 2572 * for the new channel. Note we do this only for the first 2573 * vap that reaches this point; subsequent vaps just update 2574 * their beacon state to reflect the recalculated channel. 2575 */ 2576 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2577 vap->iv_csa_count == ic->ic_csa_count) { 2578 vap->iv_csa_count = 0; 2579 /* 2580 * Effect channel change before reconstructing the beacon 2581 * frame contents as many places reference ni_chan. 2582 */ 2583 if (ic->ic_csa_newchan != NULL) 2584 ieee80211_csa_completeswitch(ic); 2585 /* 2586 * NB: ieee80211_beacon_construct clears all pending 2587 * updates in bo_flags so we don't need to explicitly 2588 * clear IEEE80211_BEACON_CSA. 2589 */ 2590 ieee80211_beacon_construct(m, 2591 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2592 2593 /* XXX do WME aggressive mode processing? */ 2594 IEEE80211_UNLOCK(ic); 2595 return 1; /* just assume length changed */ 2596 } 2597 2598 /* XXX faster to recalculate entirely or just changes? */ 2599 capinfo = getcapinfo(vap, ni->ni_chan); 2600 *bo->bo_caps = htole16(capinfo); 2601 2602 if (vap->iv_flags & IEEE80211_F_WME) { 2603 struct ieee80211_wme_state *wme = &ic->ic_wme; 2604 2605 /* 2606 * Check for agressive mode change. When there is 2607 * significant high priority traffic in the BSS 2608 * throttle back BE traffic by using conservative 2609 * parameters. Otherwise BE uses agressive params 2610 * to optimize performance of legacy/non-QoS traffic. 2611 */ 2612 if (wme->wme_flags & WME_F_AGGRMODE) { 2613 if (wme->wme_hipri_traffic > 2614 wme->wme_hipri_switch_thresh) { 2615 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2616 "%s: traffic %u, disable aggressive mode\n", 2617 __func__, wme->wme_hipri_traffic); 2618 wme->wme_flags &= ~WME_F_AGGRMODE; 2619 ieee80211_wme_updateparams_locked(vap); 2620 wme->wme_hipri_traffic = 2621 wme->wme_hipri_switch_hysteresis; 2622 } else 2623 wme->wme_hipri_traffic = 0; 2624 } else { 2625 if (wme->wme_hipri_traffic <= 2626 wme->wme_hipri_switch_thresh) { 2627 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2628 "%s: traffic %u, enable aggressive mode\n", 2629 __func__, wme->wme_hipri_traffic); 2630 wme->wme_flags |= WME_F_AGGRMODE; 2631 ieee80211_wme_updateparams_locked(vap); 2632 wme->wme_hipri_traffic = 0; 2633 } else 2634 wme->wme_hipri_traffic = 2635 wme->wme_hipri_switch_hysteresis; 2636 } 2637 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2638 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2639 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2640 } 2641 } 2642 2643 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2644 ieee80211_ht_update_beacon(vap, bo); 2645 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2646 } 2647#ifdef IEEE80211_SUPPORT_TDMA 2648 if (vap->iv_caps & IEEE80211_C_TDMA) { 2649 /* 2650 * NB: the beacon is potentially updated every TBTT. 2651 */ 2652 ieee80211_tdma_update_beacon(vap, bo); 2653 } 2654#endif 2655 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2656 struct ieee80211_tim_ie *tie = 2657 (struct ieee80211_tim_ie *) bo->bo_tim; 2658 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2659 u_int timlen, timoff, i; 2660 /* 2661 * ATIM/DTIM needs updating. If it fits in the 2662 * current space allocated then just copy in the 2663 * new bits. Otherwise we need to move any trailing 2664 * data to make room. Note that we know there is 2665 * contiguous space because ieee80211_beacon_allocate 2666 * insures there is space in the mbuf to write a 2667 * maximal-size virtual bitmap (based on iv_max_aid). 2668 */ 2669 /* 2670 * Calculate the bitmap size and offset, copy any 2671 * trailer out of the way, and then copy in the 2672 * new bitmap and update the information element. 2673 * Note that the tim bitmap must contain at least 2674 * one byte and any offset must be even. 2675 */ 2676 if (vap->iv_ps_pending != 0) { 2677 timoff = 128; /* impossibly large */ 2678 for (i = 0; i < vap->iv_tim_len; i++) 2679 if (vap->iv_tim_bitmap[i]) { 2680 timoff = i &~ 1; 2681 break; 2682 } 2683 KASSERT(timoff != 128, ("tim bitmap empty!")); 2684 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2685 if (vap->iv_tim_bitmap[i]) 2686 break; 2687 timlen = 1 + (i - timoff); 2688 } else { 2689 timoff = 0; 2690 timlen = 1; 2691 } 2692 if (timlen != bo->bo_tim_len) { 2693 /* copy up/down trailer */ 2694 int adjust = tie->tim_bitmap+timlen 2695 - bo->bo_tim_trailer; 2696 ovbcopy(bo->bo_tim_trailer, 2697 bo->bo_tim_trailer+adjust, 2698 bo->bo_tim_trailer_len); 2699 bo->bo_tim_trailer += adjust; 2700 bo->bo_erp += adjust; 2701 bo->bo_htinfo += adjust; 2702#ifdef IEEE80211_SUPERG_SUPPORT 2703 bo->bo_ath += adjust; 2704#endif 2705#ifdef IEEE80211_TDMA_SUPPORT 2706 bo->bo_tdma += adjust; 2707#endif 2708 bo->bo_appie += adjust; 2709 bo->bo_wme += adjust; 2710 bo->bo_csa += adjust; 2711 bo->bo_tim_len = timlen; 2712 2713 /* update information element */ 2714 tie->tim_len = 3 + timlen; 2715 tie->tim_bitctl = timoff; 2716 len_changed = 1; 2717 } 2718 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2719 bo->bo_tim_len); 2720 2721 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2722 2723 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2724 "%s: TIM updated, pending %u, off %u, len %u\n", 2725 __func__, vap->iv_ps_pending, timoff, timlen); 2726 } 2727 /* count down DTIM period */ 2728 if (tie->tim_count == 0) 2729 tie->tim_count = tie->tim_period - 1; 2730 else 2731 tie->tim_count--; 2732 /* update state for buffered multicast frames on DTIM */ 2733 if (mcast && tie->tim_count == 0) 2734 tie->tim_bitctl |= 1; 2735 else 2736 tie->tim_bitctl &= ~1; 2737 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2738 struct ieee80211_csa_ie *csa = 2739 (struct ieee80211_csa_ie *) bo->bo_csa; 2740 2741 /* 2742 * Insert or update CSA ie. If we're just starting 2743 * to count down to the channel switch then we need 2744 * to insert the CSA ie. Otherwise we just need to 2745 * drop the count. The actual change happens above 2746 * when the vap's count reaches the target count. 2747 */ 2748 if (vap->iv_csa_count == 0) { 2749 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2750 bo->bo_erp += sizeof(*csa); 2751 bo->bo_htinfo += sizeof(*csa); 2752 bo->bo_wme += sizeof(*csa); 2753#ifdef IEEE80211_SUPERG_SUPPORT 2754 bo->bo_ath += sizeof(*csa); 2755#endif 2756#ifdef IEEE80211_TDMA_SUPPORT 2757 bo->bo_tdma += sizeof(*csa); 2758#endif 2759 bo->bo_appie += sizeof(*csa); 2760 bo->bo_csa_trailer_len += sizeof(*csa); 2761 bo->bo_tim_trailer_len += sizeof(*csa); 2762 m->m_len += sizeof(*csa); 2763 m->m_pkthdr.len += sizeof(*csa); 2764 2765 ieee80211_add_csa(bo->bo_csa, vap); 2766 } else 2767 csa->csa_count--; 2768 vap->iv_csa_count++; 2769 /* NB: don't clear IEEE80211_BEACON_CSA */ 2770 } 2771 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2772 /* 2773 * ERP element needs updating. 2774 */ 2775 (void) ieee80211_add_erp(bo->bo_erp, ic); 2776 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2777 } 2778#ifdef IEEE80211_SUPPORT_SUPERG 2779 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2780 ieee80211_add_athcaps(bo->bo_ath, ni); 2781 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2782 } 2783#endif 2784 } 2785 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2786 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2787 int aielen; 2788 uint8_t *frm; 2789 2790 aielen = 0; 2791 if (aie != NULL) 2792 aielen += aie->ie_len; 2793 if (aielen != bo->bo_appie_len) { 2794 /* copy up/down trailer */ 2795 int adjust = aielen - bo->bo_appie_len; 2796 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2797 bo->bo_tim_trailer_len); 2798 bo->bo_tim_trailer += adjust; 2799 bo->bo_appie += adjust; 2800 bo->bo_appie_len = aielen; 2801 2802 len_changed = 1; 2803 } 2804 frm = bo->bo_appie; 2805 if (aie != NULL) 2806 frm = add_appie(frm, aie); 2807 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2808 } 2809 IEEE80211_UNLOCK(ic); 2810 2811 return len_changed; 2812} 2813