ieee80211_output.c revision 248069
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 248069 2013-03-08 20:23:55Z adrian $"); 29 30#include "opt_inet.h" 31#include "opt_inet6.h" 32#include "opt_wlan.h" 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/mbuf.h> 37#include <sys/kernel.h> 38#include <sys/endian.h> 39 40#include <sys/socket.h> 41 42#include <net/bpf.h> 43#include <net/ethernet.h> 44#include <net/if.h> 45#include <net/if_llc.h> 46#include <net/if_media.h> 47#include <net/if_vlan_var.h> 48 49#include <net80211/ieee80211_var.h> 50#include <net80211/ieee80211_regdomain.h> 51#ifdef IEEE80211_SUPPORT_SUPERG 52#include <net80211/ieee80211_superg.h> 53#endif 54#ifdef IEEE80211_SUPPORT_TDMA 55#include <net80211/ieee80211_tdma.h> 56#endif 57#include <net80211/ieee80211_wds.h> 58#include <net80211/ieee80211_mesh.h> 59 60#if defined(INET) || defined(INET6) 61#include <netinet/in.h> 62#endif 63 64#ifdef INET 65#include <netinet/if_ether.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#endif 69#ifdef INET6 70#include <netinet/ip6.h> 71#endif 72 73#include <security/mac/mac_framework.h> 74 75#define ETHER_HEADER_COPY(dst, src) \ 76 memcpy(dst, src, sizeof(struct ether_header)) 77 78/* unalligned little endian access */ 79#define LE_WRITE_2(p, v) do { \ 80 ((uint8_t *)(p))[0] = (v) & 0xff; \ 81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 82} while (0) 83#define LE_WRITE_4(p, v) do { \ 84 ((uint8_t *)(p))[0] = (v) & 0xff; \ 85 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 86 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 87 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 88} while (0) 89 90static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 91 u_int hdrsize, u_int ciphdrsize, u_int mtu); 92static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 93 94#ifdef IEEE80211_DEBUG 95/* 96 * Decide if an outbound management frame should be 97 * printed when debugging is enabled. This filters some 98 * of the less interesting frames that come frequently 99 * (e.g. beacons). 100 */ 101static __inline int 102doprint(struct ieee80211vap *vap, int subtype) 103{ 104 switch (subtype) { 105 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 106 return (vap->iv_opmode == IEEE80211_M_IBSS); 107 } 108 return 1; 109} 110#endif 111 112/* 113 * Send the given mbuf through the given vap. 114 * 115 * This consumes the mbuf regardless of whether the transmit 116 * was successful or not. 117 * 118 * This does none of the initial checks that ieee80211_start() 119 * does (eg CAC timeout, interface wakeup) - the caller must 120 * do this first. 121 */ 122static int 123ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 124{ 125#define IS_DWDS(vap) \ 126 (vap->iv_opmode == IEEE80211_M_WDS && \ 127 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 128 struct ieee80211com *ic = vap->iv_ic; 129 struct ifnet *ifp = vap->iv_ifp; 130 struct ieee80211_node *ni; 131 struct ether_header *eh; 132 int error; 133 134 /* 135 * Cancel any background scan. 136 */ 137 if (ic->ic_flags & IEEE80211_F_SCAN) 138 ieee80211_cancel_anyscan(vap); 139 /* 140 * Find the node for the destination so we can do 141 * things like power save and fast frames aggregation. 142 * 143 * NB: past this point various code assumes the first 144 * mbuf has the 802.3 header present (and contiguous). 145 */ 146 ni = NULL; 147 if (m->m_len < sizeof(struct ether_header) && 148 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 149 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 150 "discard frame, %s\n", "m_pullup failed"); 151 vap->iv_stats.is_tx_nobuf++; /* XXX */ 152 ifp->if_oerrors++; 153 return (ENOBUFS); 154 } 155 eh = mtod(m, struct ether_header *); 156 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 157 if (IS_DWDS(vap)) { 158 /* 159 * Only unicast frames from the above go out 160 * DWDS vaps; multicast frames are handled by 161 * dispatching the frame as it comes through 162 * the AP vap (see below). 163 */ 164 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 165 eh->ether_dhost, "mcast", "%s", "on DWDS"); 166 vap->iv_stats.is_dwds_mcast++; 167 m_freem(m); 168 /* XXX better status? */ 169 return (ENOBUFS); 170 } 171 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 172 /* 173 * Spam DWDS vap's w/ multicast traffic. 174 */ 175 /* XXX only if dwds in use? */ 176 ieee80211_dwds_mcast(vap, m); 177 } 178 } 179#ifdef IEEE80211_SUPPORT_MESH 180 if (vap->iv_opmode != IEEE80211_M_MBSS) { 181#endif 182 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 183 if (ni == NULL) { 184 /* NB: ieee80211_find_txnode does stat+msg */ 185 ifp->if_oerrors++; 186 m_freem(m); 187 /* XXX better status? */ 188 return (ENOBUFS); 189 } 190 if (ni->ni_associd == 0 && 191 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 192 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 193 eh->ether_dhost, NULL, 194 "sta not associated (type 0x%04x)", 195 htons(eh->ether_type)); 196 vap->iv_stats.is_tx_notassoc++; 197 ifp->if_oerrors++; 198 m_freem(m); 199 ieee80211_free_node(ni); 200 /* XXX better status? */ 201 return (ENOBUFS); 202 } 203#ifdef IEEE80211_SUPPORT_MESH 204 } else { 205 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 206 /* 207 * Proxy station only if configured. 208 */ 209 if (!ieee80211_mesh_isproxyena(vap)) { 210 IEEE80211_DISCARD_MAC(vap, 211 IEEE80211_MSG_OUTPUT | 212 IEEE80211_MSG_MESH, 213 eh->ether_dhost, NULL, 214 "%s", "proxy not enabled"); 215 vap->iv_stats.is_mesh_notproxy++; 216 ifp->if_oerrors++; 217 m_freem(m); 218 /* XXX better status? */ 219 return (ENOBUFS); 220 } 221 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 222 "forward frame from DS SA(%6D), DA(%6D)\n", 223 eh->ether_shost, ":", 224 eh->ether_dhost, ":"); 225 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 226 } 227 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 228 if (ni == NULL) { 229 /* 230 * NB: ieee80211_mesh_discover holds/disposes 231 * frame (e.g. queueing on path discovery). 232 */ 233 ifp->if_oerrors++; 234 /* XXX better status? */ 235 return (ENOBUFS); 236 } 237 } 238#endif 239 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 240 (m->m_flags & M_PWR_SAV) == 0) { 241 /* 242 * Station in power save mode; pass the frame 243 * to the 802.11 layer and continue. We'll get 244 * the frame back when the time is right. 245 * XXX lose WDS vap linkage? 246 */ 247 (void) ieee80211_pwrsave(ni, m); 248 ieee80211_free_node(ni); 249 /* XXX better status? */ 250 return (ENOBUFS); 251 } 252 /* calculate priority so drivers can find the tx queue */ 253 if (ieee80211_classify(ni, m)) { 254 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 255 eh->ether_dhost, NULL, 256 "%s", "classification failure"); 257 vap->iv_stats.is_tx_classify++; 258 ifp->if_oerrors++; 259 m_freem(m); 260 ieee80211_free_node(ni); 261 /* XXX better status? */ 262 return (ENOBUFS); 263 } 264 /* 265 * Stash the node pointer. Note that we do this after 266 * any call to ieee80211_dwds_mcast because that code 267 * uses any existing value for rcvif to identify the 268 * interface it (might have been) received on. 269 */ 270 m->m_pkthdr.rcvif = (void *)ni; 271 272 BPF_MTAP(ifp, m); /* 802.3 tx */ 273 274 275 /* 276 * Check if A-MPDU tx aggregation is setup or if we 277 * should try to enable it. The sta must be associated 278 * with HT and A-MPDU enabled for use. When the policy 279 * routine decides we should enable A-MPDU we issue an 280 * ADDBA request and wait for a reply. The frame being 281 * encapsulated will go out w/o using A-MPDU, or possibly 282 * it might be collected by the driver and held/retransmit. 283 * The default ic_ampdu_enable routine handles staggering 284 * ADDBA requests in case the receiver NAK's us or we are 285 * otherwise unable to establish a BA stream. 286 */ 287 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 288 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 289 (m->m_flags & M_EAPOL) == 0) { 290 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 291 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 292 293 ieee80211_txampdu_count_packet(tap); 294 if (IEEE80211_AMPDU_RUNNING(tap)) { 295 /* 296 * Operational, mark frame for aggregation. 297 * 298 * XXX do tx aggregation here 299 */ 300 m->m_flags |= M_AMPDU_MPDU; 301 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 302 ic->ic_ampdu_enable(ni, tap)) { 303 /* 304 * Not negotiated yet, request service. 305 */ 306 ieee80211_ampdu_request(ni, tap); 307 /* XXX hold frame for reply? */ 308 } 309 } 310 311#ifdef IEEE80211_SUPPORT_SUPERG 312 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 313 m = ieee80211_ff_check(ni, m); 314 if (m == NULL) { 315 /* NB: any ni ref held on stageq */ 316 /* XXX better status? */ 317 return (ENOBUFS); 318 } 319 } 320#endif /* IEEE80211_SUPPORT_SUPERG */ 321 322 /* 323 * Grab the TX lock - serialise the TX process from this 324 * point (where TX state is being checked/modified) 325 * through to driver queue. 326 */ 327 IEEE80211_TX_LOCK(ic); 328 329 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 330 /* 331 * Encapsulate the packet in prep for transmission. 332 */ 333 m = ieee80211_encap(vap, ni, m); 334 if (m == NULL) { 335 /* NB: stat+msg handled in ieee80211_encap */ 336 IEEE80211_TX_UNLOCK(ic); 337 ieee80211_free_node(ni); 338 /* XXX better status? */ 339 return (ENOBUFS); 340 } 341 } 342 error = ieee80211_parent_transmit(ic, m); 343 344 /* 345 * Unlock at this point - no need to hold it across 346 * ieee80211_free_node() (ie, the comlock) 347 */ 348 IEEE80211_TX_UNLOCK(ic); 349 if (error != 0) { 350 /* NB: IFQ_HANDOFF reclaims mbuf */ 351 ieee80211_free_node(ni); 352 } else { 353 ifp->if_opackets++; 354 } 355 ic->ic_lastdata = ticks; 356 357 return (0); 358#undef IS_DWDS 359} 360 361/* 362 * Start method for vap's. All packets from the stack come 363 * through here. We handle common processing of the packets 364 * before dispatching them to the underlying device. 365 */ 366void 367ieee80211_start(struct ifnet *ifp) 368{ 369 struct ieee80211vap *vap = ifp->if_softc; 370 struct ieee80211com *ic = vap->iv_ic; 371 struct ifnet *parent = ic->ic_ifp; 372 struct mbuf *m; 373 374 /* NB: parent must be up and running */ 375 if (!IFNET_IS_UP_RUNNING(parent)) { 376 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 377 "%s: ignore queue, parent %s not up+running\n", 378 __func__, parent->if_xname); 379 /* XXX stat */ 380 return; 381 } 382 if (vap->iv_state == IEEE80211_S_SLEEP) { 383 /* 384 * In power save, wakeup device for transmit. 385 */ 386 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 387 return; 388 } 389 /* 390 * No data frames go out unless we're running. 391 * Note in particular this covers CAC and CSA 392 * states (though maybe we should check muting 393 * for CSA). 394 */ 395 if (vap->iv_state != IEEE80211_S_RUN) { 396 IEEE80211_LOCK(ic); 397 /* re-check under the com lock to avoid races */ 398 if (vap->iv_state != IEEE80211_S_RUN) { 399 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 400 "%s: ignore queue, in %s state\n", 401 __func__, ieee80211_state_name[vap->iv_state]); 402 vap->iv_stats.is_tx_badstate++; 403 IEEE80211_UNLOCK(ic); 404 IFQ_LOCK(&ifp->if_snd); 405 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 406 IFQ_UNLOCK(&ifp->if_snd); 407 return; 408 } 409 IEEE80211_UNLOCK(ic); 410 } 411 412 for (;;) { 413 IFQ_DEQUEUE(&ifp->if_snd, m); 414 if (m == NULL) 415 break; 416 /* 417 * Sanitize mbuf flags for net80211 use. We cannot 418 * clear M_PWR_SAV or M_MORE_DATA because these may 419 * be set for frames that are re-submitted from the 420 * power save queue. 421 * 422 * NB: This must be done before ieee80211_classify as 423 * it marks EAPOL in frames with M_EAPOL. 424 */ 425 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 426 /* 427 * Bump to the packet transmission path. 428 */ 429 (void) ieee80211_start_pkt(vap, m); 430 /* mbuf is consumed here */ 431 } 432} 433 434/* 435 * 802.11 raw output routine. 436 */ 437int 438ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 439 struct mbuf *m, const struct ieee80211_bpf_params *params) 440{ 441 struct ieee80211com *ic = vap->iv_ic; 442 443 return (ic->ic_raw_xmit(ni, m, params)); 444} 445 446/* 447 * 802.11 output routine. This is (currently) used only to 448 * connect bpf write calls to the 802.11 layer for injecting 449 * raw 802.11 frames. 450 */ 451int 452ieee80211_output(struct ifnet *ifp, struct mbuf *m, 453 struct sockaddr *dst, struct route *ro) 454{ 455#define senderr(e) do { error = (e); goto bad;} while (0) 456 struct ieee80211_node *ni = NULL; 457 struct ieee80211vap *vap; 458 struct ieee80211_frame *wh; 459 struct ieee80211com *ic = NULL; 460 int error; 461 int ret; 462 463 IFQ_LOCK(&ifp->if_snd); 464 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 465 IFQ_UNLOCK(&ifp->if_snd); 466 /* 467 * Short-circuit requests if the vap is marked OACTIVE 468 * as this can happen because a packet came down through 469 * ieee80211_start before the vap entered RUN state in 470 * which case it's ok to just drop the frame. This 471 * should not be necessary but callers of if_output don't 472 * check OACTIVE. 473 */ 474 senderr(ENETDOWN); 475 } 476 IFQ_UNLOCK(&ifp->if_snd); 477 vap = ifp->if_softc; 478 ic = vap->iv_ic; 479 /* 480 * Hand to the 802.3 code if not tagged as 481 * a raw 802.11 frame. 482 */ 483 if (dst->sa_family != AF_IEEE80211) 484 return vap->iv_output(ifp, m, dst, ro); 485#ifdef MAC 486 error = mac_ifnet_check_transmit(ifp, m); 487 if (error) 488 senderr(error); 489#endif 490 if (ifp->if_flags & IFF_MONITOR) 491 senderr(ENETDOWN); 492 if (!IFNET_IS_UP_RUNNING(ifp)) 493 senderr(ENETDOWN); 494 if (vap->iv_state == IEEE80211_S_CAC) { 495 IEEE80211_DPRINTF(vap, 496 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 497 "block %s frame in CAC state\n", "raw data"); 498 vap->iv_stats.is_tx_badstate++; 499 senderr(EIO); /* XXX */ 500 } else if (vap->iv_state == IEEE80211_S_SCAN) 501 senderr(EIO); 502 /* XXX bypass bridge, pfil, carp, etc. */ 503 504 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 505 senderr(EIO); /* XXX */ 506 wh = mtod(m, struct ieee80211_frame *); 507 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 508 IEEE80211_FC0_VERSION_0) 509 senderr(EIO); /* XXX */ 510 511 /* locate destination node */ 512 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 513 case IEEE80211_FC1_DIR_NODS: 514 case IEEE80211_FC1_DIR_FROMDS: 515 ni = ieee80211_find_txnode(vap, wh->i_addr1); 516 break; 517 case IEEE80211_FC1_DIR_TODS: 518 case IEEE80211_FC1_DIR_DSTODS: 519 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 520 senderr(EIO); /* XXX */ 521 ni = ieee80211_find_txnode(vap, wh->i_addr3); 522 break; 523 default: 524 senderr(EIO); /* XXX */ 525 } 526 if (ni == NULL) { 527 /* 528 * Permit packets w/ bpf params through regardless 529 * (see below about sa_len). 530 */ 531 if (dst->sa_len == 0) 532 senderr(EHOSTUNREACH); 533 ni = ieee80211_ref_node(vap->iv_bss); 534 } 535 536 /* 537 * Sanitize mbuf for net80211 flags leaked from above. 538 * 539 * NB: This must be done before ieee80211_classify as 540 * it marks EAPOL in frames with M_EAPOL. 541 */ 542 m->m_flags &= ~M_80211_TX; 543 544 /* calculate priority so drivers can find the tx queue */ 545 /* XXX assumes an 802.3 frame */ 546 if (ieee80211_classify(ni, m)) 547 senderr(EIO); /* XXX */ 548 549 ifp->if_opackets++; 550 IEEE80211_NODE_STAT(ni, tx_data); 551 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 552 IEEE80211_NODE_STAT(ni, tx_mcast); 553 m->m_flags |= M_MCAST; 554 } else 555 IEEE80211_NODE_STAT(ni, tx_ucast); 556 /* NB: ieee80211_encap does not include 802.11 header */ 557 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 558 559 IEEE80211_TX_LOCK(ic); 560 561 /* 562 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 563 * present by setting the sa_len field of the sockaddr (yes, 564 * this is a hack). 565 * NB: we assume sa_data is suitably aligned to cast. 566 */ 567 ret = ieee80211_raw_output(vap, ni, m, 568 (const struct ieee80211_bpf_params *)(dst->sa_len ? 569 dst->sa_data : NULL)); 570 IEEE80211_TX_UNLOCK(ic); 571 return (ret); 572bad: 573 if (m != NULL) 574 m_freem(m); 575 if (ni != NULL) 576 ieee80211_free_node(ni); 577 ifp->if_oerrors++; 578 return error; 579#undef senderr 580} 581 582/* 583 * Set the direction field and address fields of an outgoing 584 * frame. Note this should be called early on in constructing 585 * a frame as it sets i_fc[1]; other bits can then be or'd in. 586 */ 587void 588ieee80211_send_setup( 589 struct ieee80211_node *ni, 590 struct mbuf *m, 591 int type, int tid, 592 const uint8_t sa[IEEE80211_ADDR_LEN], 593 const uint8_t da[IEEE80211_ADDR_LEN], 594 const uint8_t bssid[IEEE80211_ADDR_LEN]) 595{ 596#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 597 struct ieee80211vap *vap = ni->ni_vap; 598 struct ieee80211_tx_ampdu *tap; 599 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 600 struct ieee80211com *ic = ni->ni_ic; 601 ieee80211_seq seqno; 602 603 IEEE80211_TX_LOCK_ASSERT(ic); 604 605 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 606 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 607 switch (vap->iv_opmode) { 608 case IEEE80211_M_STA: 609 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 610 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 611 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 612 IEEE80211_ADDR_COPY(wh->i_addr3, da); 613 break; 614 case IEEE80211_M_IBSS: 615 case IEEE80211_M_AHDEMO: 616 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 617 IEEE80211_ADDR_COPY(wh->i_addr1, da); 618 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 619 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 620 break; 621 case IEEE80211_M_HOSTAP: 622 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 623 IEEE80211_ADDR_COPY(wh->i_addr1, da); 624 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 625 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 626 break; 627 case IEEE80211_M_WDS: 628 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 629 IEEE80211_ADDR_COPY(wh->i_addr1, da); 630 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 631 IEEE80211_ADDR_COPY(wh->i_addr3, da); 632 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 633 break; 634 case IEEE80211_M_MBSS: 635#ifdef IEEE80211_SUPPORT_MESH 636 if (IEEE80211_IS_MULTICAST(da)) { 637 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 638 /* XXX next hop */ 639 IEEE80211_ADDR_COPY(wh->i_addr1, da); 640 IEEE80211_ADDR_COPY(wh->i_addr2, 641 vap->iv_myaddr); 642 } else { 643 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 644 IEEE80211_ADDR_COPY(wh->i_addr1, da); 645 IEEE80211_ADDR_COPY(wh->i_addr2, 646 vap->iv_myaddr); 647 IEEE80211_ADDR_COPY(wh->i_addr3, da); 648 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 649 } 650#endif 651 break; 652 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 653 break; 654 } 655 } else { 656 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 657 IEEE80211_ADDR_COPY(wh->i_addr1, da); 658 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 659#ifdef IEEE80211_SUPPORT_MESH 660 if (vap->iv_opmode == IEEE80211_M_MBSS) 661 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 662 else 663#endif 664 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 665 } 666 *(uint16_t *)&wh->i_dur[0] = 0; 667 668 tap = &ni->ni_tx_ampdu[tid]; 669 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 670 m->m_flags |= M_AMPDU_MPDU; 671 else { 672 seqno = ni->ni_txseqs[tid]++; 673 *(uint16_t *)&wh->i_seq[0] = 674 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 675 M_SEQNO_SET(m, seqno); 676 } 677 678 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 679 m->m_flags |= M_MCAST; 680#undef WH4 681} 682 683/* 684 * Send a management frame to the specified node. The node pointer 685 * must have a reference as the pointer will be passed to the driver 686 * and potentially held for a long time. If the frame is successfully 687 * dispatched to the driver, then it is responsible for freeing the 688 * reference (and potentially free'ing up any associated storage); 689 * otherwise deal with reclaiming any reference (on error). 690 */ 691int 692ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 693 struct ieee80211_bpf_params *params) 694{ 695 struct ieee80211vap *vap = ni->ni_vap; 696 struct ieee80211com *ic = ni->ni_ic; 697 struct ieee80211_frame *wh; 698 int ret; 699 700 KASSERT(ni != NULL, ("null node")); 701 702 if (vap->iv_state == IEEE80211_S_CAC) { 703 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 704 ni, "block %s frame in CAC state", 705 ieee80211_mgt_subtype_name[ 706 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 707 IEEE80211_FC0_SUBTYPE_SHIFT]); 708 vap->iv_stats.is_tx_badstate++; 709 ieee80211_free_node(ni); 710 m_freem(m); 711 return EIO; /* XXX */ 712 } 713 714 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 715 if (m == NULL) { 716 ieee80211_free_node(ni); 717 return ENOMEM; 718 } 719 720 IEEE80211_TX_LOCK(ic); 721 722 wh = mtod(m, struct ieee80211_frame *); 723 ieee80211_send_setup(ni, m, 724 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 725 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 726 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 727 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 728 "encrypting frame (%s)", __func__); 729 wh->i_fc[1] |= IEEE80211_FC1_WEP; 730 } 731 m->m_flags |= M_ENCAP; /* mark encapsulated */ 732 733 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 734 M_WME_SETAC(m, params->ibp_pri); 735 736#ifdef IEEE80211_DEBUG 737 /* avoid printing too many frames */ 738 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 739 ieee80211_msg_dumppkts(vap)) { 740 printf("[%s] send %s on channel %u\n", 741 ether_sprintf(wh->i_addr1), 742 ieee80211_mgt_subtype_name[ 743 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 744 IEEE80211_FC0_SUBTYPE_SHIFT], 745 ieee80211_chan2ieee(ic, ic->ic_curchan)); 746 } 747#endif 748 IEEE80211_NODE_STAT(ni, tx_mgmt); 749 750 ret = ieee80211_raw_output(vap, ni, m, params); 751 IEEE80211_TX_UNLOCK(ic); 752 return (ret); 753} 754 755/* 756 * Send a null data frame to the specified node. If the station 757 * is setup for QoS then a QoS Null Data frame is constructed. 758 * If this is a WDS station then a 4-address frame is constructed. 759 * 760 * NB: the caller is assumed to have setup a node reference 761 * for use; this is necessary to deal with a race condition 762 * when probing for inactive stations. Like ieee80211_mgmt_output 763 * we must cleanup any node reference on error; however we 764 * can safely just unref it as we know it will never be the 765 * last reference to the node. 766 */ 767int 768ieee80211_send_nulldata(struct ieee80211_node *ni) 769{ 770 struct ieee80211vap *vap = ni->ni_vap; 771 struct ieee80211com *ic = ni->ni_ic; 772 struct mbuf *m; 773 struct ieee80211_frame *wh; 774 int hdrlen; 775 uint8_t *frm; 776 int ret; 777 778 if (vap->iv_state == IEEE80211_S_CAC) { 779 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 780 ni, "block %s frame in CAC state", "null data"); 781 ieee80211_unref_node(&ni); 782 vap->iv_stats.is_tx_badstate++; 783 return EIO; /* XXX */ 784 } 785 786 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 787 hdrlen = sizeof(struct ieee80211_qosframe); 788 else 789 hdrlen = sizeof(struct ieee80211_frame); 790 /* NB: only WDS vap's get 4-address frames */ 791 if (vap->iv_opmode == IEEE80211_M_WDS) 792 hdrlen += IEEE80211_ADDR_LEN; 793 if (ic->ic_flags & IEEE80211_F_DATAPAD) 794 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 795 796 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 797 if (m == NULL) { 798 /* XXX debug msg */ 799 ieee80211_unref_node(&ni); 800 vap->iv_stats.is_tx_nobuf++; 801 return ENOMEM; 802 } 803 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 804 ("leading space %zd", M_LEADINGSPACE(m))); 805 M_PREPEND(m, hdrlen, M_NOWAIT); 806 if (m == NULL) { 807 /* NB: cannot happen */ 808 ieee80211_free_node(ni); 809 return ENOMEM; 810 } 811 812 IEEE80211_TX_LOCK(ic); 813 814 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 815 if (ni->ni_flags & IEEE80211_NODE_QOS) { 816 const int tid = WME_AC_TO_TID(WME_AC_BE); 817 uint8_t *qos; 818 819 ieee80211_send_setup(ni, m, 820 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 821 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 822 823 if (vap->iv_opmode == IEEE80211_M_WDS) 824 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 825 else 826 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 827 qos[0] = tid & IEEE80211_QOS_TID; 828 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 829 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 830 qos[1] = 0; 831 } else { 832 ieee80211_send_setup(ni, m, 833 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 834 IEEE80211_NONQOS_TID, 835 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 836 } 837 if (vap->iv_opmode != IEEE80211_M_WDS) { 838 /* NB: power management bit is never sent by an AP */ 839 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 840 vap->iv_opmode != IEEE80211_M_HOSTAP) 841 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 842 } 843 m->m_len = m->m_pkthdr.len = hdrlen; 844 m->m_flags |= M_ENCAP; /* mark encapsulated */ 845 846 M_WME_SETAC(m, WME_AC_BE); 847 848 IEEE80211_NODE_STAT(ni, tx_data); 849 850 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 851 "send %snull data frame on channel %u, pwr mgt %s", 852 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 853 ieee80211_chan2ieee(ic, ic->ic_curchan), 854 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 855 856 ret = ieee80211_raw_output(vap, ni, m, NULL); 857 IEEE80211_TX_UNLOCK(ic); 858 return (ret); 859} 860 861/* 862 * Assign priority to a frame based on any vlan tag assigned 863 * to the station and/or any Diffserv setting in an IP header. 864 * Finally, if an ACM policy is setup (in station mode) it's 865 * applied. 866 */ 867int 868ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 869{ 870 const struct ether_header *eh = mtod(m, struct ether_header *); 871 int v_wme_ac, d_wme_ac, ac; 872 873 /* 874 * Always promote PAE/EAPOL frames to high priority. 875 */ 876 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 877 /* NB: mark so others don't need to check header */ 878 m->m_flags |= M_EAPOL; 879 ac = WME_AC_VO; 880 goto done; 881 } 882 /* 883 * Non-qos traffic goes to BE. 884 */ 885 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 886 ac = WME_AC_BE; 887 goto done; 888 } 889 890 /* 891 * If node has a vlan tag then all traffic 892 * to it must have a matching tag. 893 */ 894 v_wme_ac = 0; 895 if (ni->ni_vlan != 0) { 896 if ((m->m_flags & M_VLANTAG) == 0) { 897 IEEE80211_NODE_STAT(ni, tx_novlantag); 898 return 1; 899 } 900 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 901 EVL_VLANOFTAG(ni->ni_vlan)) { 902 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 903 return 1; 904 } 905 /* map vlan priority to AC */ 906 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 907 } 908 909 /* XXX m_copydata may be too slow for fast path */ 910#ifdef INET 911 if (eh->ether_type == htons(ETHERTYPE_IP)) { 912 uint8_t tos; 913 /* 914 * IP frame, map the DSCP bits from the TOS field. 915 */ 916 /* NB: ip header may not be in first mbuf */ 917 m_copydata(m, sizeof(struct ether_header) + 918 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 919 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 920 d_wme_ac = TID_TO_WME_AC(tos); 921 } else { 922#endif /* INET */ 923#ifdef INET6 924 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 925 uint32_t flow; 926 uint8_t tos; 927 /* 928 * IPv6 frame, map the DSCP bits from the traffic class field. 929 */ 930 m_copydata(m, sizeof(struct ether_header) + 931 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 932 (caddr_t) &flow); 933 tos = (uint8_t)(ntohl(flow) >> 20); 934 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 935 d_wme_ac = TID_TO_WME_AC(tos); 936 } else { 937#endif /* INET6 */ 938 d_wme_ac = WME_AC_BE; 939#ifdef INET6 940 } 941#endif 942#ifdef INET 943 } 944#endif 945 /* 946 * Use highest priority AC. 947 */ 948 if (v_wme_ac > d_wme_ac) 949 ac = v_wme_ac; 950 else 951 ac = d_wme_ac; 952 953 /* 954 * Apply ACM policy. 955 */ 956 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 957 static const int acmap[4] = { 958 WME_AC_BK, /* WME_AC_BE */ 959 WME_AC_BK, /* WME_AC_BK */ 960 WME_AC_BE, /* WME_AC_VI */ 961 WME_AC_VI, /* WME_AC_VO */ 962 }; 963 struct ieee80211com *ic = ni->ni_ic; 964 965 while (ac != WME_AC_BK && 966 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 967 ac = acmap[ac]; 968 } 969done: 970 M_WME_SETAC(m, ac); 971 return 0; 972} 973 974/* 975 * Insure there is sufficient contiguous space to encapsulate the 976 * 802.11 data frame. If room isn't already there, arrange for it. 977 * Drivers and cipher modules assume we have done the necessary work 978 * and fail rudely if they don't find the space they need. 979 */ 980struct mbuf * 981ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 982 struct ieee80211_key *key, struct mbuf *m) 983{ 984#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 985 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 986 987 if (key != NULL) { 988 /* XXX belongs in crypto code? */ 989 needed_space += key->wk_cipher->ic_header; 990 /* XXX frags */ 991 /* 992 * When crypto is being done in the host we must insure 993 * the data are writable for the cipher routines; clone 994 * a writable mbuf chain. 995 * XXX handle SWMIC specially 996 */ 997 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 998 m = m_unshare(m, M_NOWAIT); 999 if (m == NULL) { 1000 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1001 "%s: cannot get writable mbuf\n", __func__); 1002 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1003 return NULL; 1004 } 1005 } 1006 } 1007 /* 1008 * We know we are called just before stripping an Ethernet 1009 * header and prepending an LLC header. This means we know 1010 * there will be 1011 * sizeof(struct ether_header) - sizeof(struct llc) 1012 * bytes recovered to which we need additional space for the 1013 * 802.11 header and any crypto header. 1014 */ 1015 /* XXX check trailing space and copy instead? */ 1016 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1017 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1018 if (n == NULL) { 1019 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1020 "%s: cannot expand storage\n", __func__); 1021 vap->iv_stats.is_tx_nobuf++; 1022 m_freem(m); 1023 return NULL; 1024 } 1025 KASSERT(needed_space <= MHLEN, 1026 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 1027 /* 1028 * Setup new mbuf to have leading space to prepend the 1029 * 802.11 header and any crypto header bits that are 1030 * required (the latter are added when the driver calls 1031 * back to ieee80211_crypto_encap to do crypto encapsulation). 1032 */ 1033 /* NB: must be first 'cuz it clobbers m_data */ 1034 m_move_pkthdr(n, m); 1035 n->m_len = 0; /* NB: m_gethdr does not set */ 1036 n->m_data += needed_space; 1037 /* 1038 * Pull up Ethernet header to create the expected layout. 1039 * We could use m_pullup but that's overkill (i.e. we don't 1040 * need the actual data) and it cannot fail so do it inline 1041 * for speed. 1042 */ 1043 /* NB: struct ether_header is known to be contiguous */ 1044 n->m_len += sizeof(struct ether_header); 1045 m->m_len -= sizeof(struct ether_header); 1046 m->m_data += sizeof(struct ether_header); 1047 /* 1048 * Replace the head of the chain. 1049 */ 1050 n->m_next = m; 1051 m = n; 1052 } 1053 return m; 1054#undef TO_BE_RECLAIMED 1055} 1056 1057/* 1058 * Return the transmit key to use in sending a unicast frame. 1059 * If a unicast key is set we use that. When no unicast key is set 1060 * we fall back to the default transmit key. 1061 */ 1062static __inline struct ieee80211_key * 1063ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1064 struct ieee80211_node *ni) 1065{ 1066 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1067 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1068 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1069 return NULL; 1070 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1071 } else { 1072 return &ni->ni_ucastkey; 1073 } 1074} 1075 1076/* 1077 * Return the transmit key to use in sending a multicast frame. 1078 * Multicast traffic always uses the group key which is installed as 1079 * the default tx key. 1080 */ 1081static __inline struct ieee80211_key * 1082ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1083 struct ieee80211_node *ni) 1084{ 1085 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1086 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1087 return NULL; 1088 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1089} 1090 1091/* 1092 * Encapsulate an outbound data frame. The mbuf chain is updated. 1093 * If an error is encountered NULL is returned. The caller is required 1094 * to provide a node reference and pullup the ethernet header in the 1095 * first mbuf. 1096 * 1097 * NB: Packet is assumed to be processed by ieee80211_classify which 1098 * marked EAPOL frames w/ M_EAPOL. 1099 */ 1100struct mbuf * 1101ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1102 struct mbuf *m) 1103{ 1104#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1105#define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1106 struct ieee80211com *ic = ni->ni_ic; 1107#ifdef IEEE80211_SUPPORT_MESH 1108 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1109 struct ieee80211_meshcntl_ae10 *mc; 1110 struct ieee80211_mesh_route *rt = NULL; 1111 int dir = -1; 1112#endif 1113 struct ether_header eh; 1114 struct ieee80211_frame *wh; 1115 struct ieee80211_key *key; 1116 struct llc *llc; 1117 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1118 ieee80211_seq seqno; 1119 int meshhdrsize, meshae; 1120 uint8_t *qos; 1121 1122 IEEE80211_TX_LOCK_ASSERT(ic); 1123 1124 /* 1125 * Copy existing Ethernet header to a safe place. The 1126 * rest of the code assumes it's ok to strip it when 1127 * reorganizing state for the final encapsulation. 1128 */ 1129 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1130 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1131 1132 /* 1133 * Insure space for additional headers. First identify 1134 * transmit key to use in calculating any buffer adjustments 1135 * required. This is also used below to do privacy 1136 * encapsulation work. Then calculate the 802.11 header 1137 * size and any padding required by the driver. 1138 * 1139 * Note key may be NULL if we fall back to the default 1140 * transmit key and that is not set. In that case the 1141 * buffer may not be expanded as needed by the cipher 1142 * routines, but they will/should discard it. 1143 */ 1144 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1145 if (vap->iv_opmode == IEEE80211_M_STA || 1146 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1147 (vap->iv_opmode == IEEE80211_M_WDS && 1148 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1149 key = ieee80211_crypto_getucastkey(vap, ni); 1150 else 1151 key = ieee80211_crypto_getmcastkey(vap, ni); 1152 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1153 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1154 eh.ether_dhost, 1155 "no default transmit key (%s) deftxkey %u", 1156 __func__, vap->iv_def_txkey); 1157 vap->iv_stats.is_tx_nodefkey++; 1158 goto bad; 1159 } 1160 } else 1161 key = NULL; 1162 /* 1163 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1164 * frames so suppress use. This may be an issue if other 1165 * ap's require all data frames to be QoS-encapsulated 1166 * once negotiated in which case we'll need to make this 1167 * configurable. 1168 * NB: mesh data frames are QoS. 1169 */ 1170 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1171 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1172 (m->m_flags & M_EAPOL) == 0; 1173 if (addqos) 1174 hdrsize = sizeof(struct ieee80211_qosframe); 1175 else 1176 hdrsize = sizeof(struct ieee80211_frame); 1177#ifdef IEEE80211_SUPPORT_MESH 1178 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1179 /* 1180 * Mesh data frames are encapsulated according to the 1181 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1182 * o Group Addressed data (aka multicast) originating 1183 * at the local sta are sent w/ 3-address format and 1184 * address extension mode 00 1185 * o Individually Addressed data (aka unicast) originating 1186 * at the local sta are sent w/ 4-address format and 1187 * address extension mode 00 1188 * o Group Addressed data forwarded from a non-mesh sta are 1189 * sent w/ 3-address format and address extension mode 01 1190 * o Individually Address data from another sta are sent 1191 * w/ 4-address format and address extension mode 10 1192 */ 1193 is4addr = 0; /* NB: don't use, disable */ 1194 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1195 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1196 KASSERT(rt != NULL, ("route is NULL")); 1197 dir = IEEE80211_FC1_DIR_DSTODS; 1198 hdrsize += IEEE80211_ADDR_LEN; 1199 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1200 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1201 vap->iv_myaddr)) { 1202 IEEE80211_NOTE_MAC(vap, 1203 IEEE80211_MSG_MESH, 1204 eh.ether_dhost, 1205 "%s", "trying to send to ourself"); 1206 goto bad; 1207 } 1208 meshae = IEEE80211_MESH_AE_10; 1209 meshhdrsize = 1210 sizeof(struct ieee80211_meshcntl_ae10); 1211 } else { 1212 meshae = IEEE80211_MESH_AE_00; 1213 meshhdrsize = 1214 sizeof(struct ieee80211_meshcntl); 1215 } 1216 } else { 1217 dir = IEEE80211_FC1_DIR_FROMDS; 1218 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1219 /* proxy group */ 1220 meshae = IEEE80211_MESH_AE_01; 1221 meshhdrsize = 1222 sizeof(struct ieee80211_meshcntl_ae01); 1223 } else { 1224 /* group */ 1225 meshae = IEEE80211_MESH_AE_00; 1226 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1227 } 1228 } 1229 } else { 1230#endif 1231 /* 1232 * 4-address frames need to be generated for: 1233 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1234 * o packets sent through a vap marked for relaying 1235 * (e.g. a station operating with dynamic WDS) 1236 */ 1237 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1238 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1239 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1240 if (is4addr) 1241 hdrsize += IEEE80211_ADDR_LEN; 1242 meshhdrsize = meshae = 0; 1243#ifdef IEEE80211_SUPPORT_MESH 1244 } 1245#endif 1246 /* 1247 * Honor driver DATAPAD requirement. 1248 */ 1249 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1250 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1251 else 1252 hdrspace = hdrsize; 1253 1254 if (__predict_true((m->m_flags & M_FF) == 0)) { 1255 /* 1256 * Normal frame. 1257 */ 1258 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1259 if (m == NULL) { 1260 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1261 goto bad; 1262 } 1263 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1264 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1265 llc = mtod(m, struct llc *); 1266 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1267 llc->llc_control = LLC_UI; 1268 llc->llc_snap.org_code[0] = 0; 1269 llc->llc_snap.org_code[1] = 0; 1270 llc->llc_snap.org_code[2] = 0; 1271 llc->llc_snap.ether_type = eh.ether_type; 1272 } else { 1273#ifdef IEEE80211_SUPPORT_SUPERG 1274 /* 1275 * Aggregated frame. 1276 */ 1277 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1278 if (m == NULL) 1279#endif 1280 goto bad; 1281 } 1282 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1283 1284 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1285 if (m == NULL) { 1286 vap->iv_stats.is_tx_nobuf++; 1287 goto bad; 1288 } 1289 wh = mtod(m, struct ieee80211_frame *); 1290 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1291 *(uint16_t *)wh->i_dur = 0; 1292 qos = NULL; /* NB: quiet compiler */ 1293 if (is4addr) { 1294 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1295 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1296 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1297 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1298 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1299 } else switch (vap->iv_opmode) { 1300 case IEEE80211_M_STA: 1301 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1302 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1303 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1304 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1305 break; 1306 case IEEE80211_M_IBSS: 1307 case IEEE80211_M_AHDEMO: 1308 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1309 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1310 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1311 /* 1312 * NB: always use the bssid from iv_bss as the 1313 * neighbor's may be stale after an ibss merge 1314 */ 1315 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1316 break; 1317 case IEEE80211_M_HOSTAP: 1318 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1319 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1320 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1321 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1322 break; 1323#ifdef IEEE80211_SUPPORT_MESH 1324 case IEEE80211_M_MBSS: 1325 /* NB: offset by hdrspace to deal with DATAPAD */ 1326 mc = (struct ieee80211_meshcntl_ae10 *) 1327 (mtod(m, uint8_t *) + hdrspace); 1328 wh->i_fc[1] = dir; 1329 switch (meshae) { 1330 case IEEE80211_MESH_AE_00: /* no proxy */ 1331 mc->mc_flags = 0; 1332 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1333 IEEE80211_ADDR_COPY(wh->i_addr1, 1334 ni->ni_macaddr); 1335 IEEE80211_ADDR_COPY(wh->i_addr2, 1336 vap->iv_myaddr); 1337 IEEE80211_ADDR_COPY(wh->i_addr3, 1338 eh.ether_dhost); 1339 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1340 eh.ether_shost); 1341 qos =((struct ieee80211_qosframe_addr4 *) 1342 wh)->i_qos; 1343 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1344 /* mcast */ 1345 IEEE80211_ADDR_COPY(wh->i_addr1, 1346 eh.ether_dhost); 1347 IEEE80211_ADDR_COPY(wh->i_addr2, 1348 vap->iv_myaddr); 1349 IEEE80211_ADDR_COPY(wh->i_addr3, 1350 eh.ether_shost); 1351 qos = ((struct ieee80211_qosframe *) 1352 wh)->i_qos; 1353 } 1354 break; 1355 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1356 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1357 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1358 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1359 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1360 mc->mc_flags = 1; 1361 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1362 eh.ether_shost); 1363 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1364 break; 1365 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1366 KASSERT(rt != NULL, ("route is NULL")); 1367 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1368 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1369 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1370 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1371 mc->mc_flags = IEEE80211_MESH_AE_10; 1372 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1373 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1374 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1375 break; 1376 default: 1377 KASSERT(0, ("meshae %d", meshae)); 1378 break; 1379 } 1380 mc->mc_ttl = ms->ms_ttl; 1381 ms->ms_seq++; 1382 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1383 break; 1384#endif 1385 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1386 default: 1387 goto bad; 1388 } 1389 if (m->m_flags & M_MORE_DATA) 1390 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1391 if (addqos) { 1392 int ac, tid; 1393 1394 if (is4addr) { 1395 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1396 /* NB: mesh case handled earlier */ 1397 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1398 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1399 ac = M_WME_GETAC(m); 1400 /* map from access class/queue to 11e header priorty value */ 1401 tid = WME_AC_TO_TID(ac); 1402 qos[0] = tid & IEEE80211_QOS_TID; 1403 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1404 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1405#ifdef IEEE80211_SUPPORT_MESH 1406 if (vap->iv_opmode == IEEE80211_M_MBSS) 1407 qos[1] = IEEE80211_QOS_MC; 1408 else 1409#endif 1410 qos[1] = 0; 1411 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1412 1413 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1414 /* 1415 * NB: don't assign a sequence # to potential 1416 * aggregates; we expect this happens at the 1417 * point the frame comes off any aggregation q 1418 * as otherwise we may introduce holes in the 1419 * BA sequence space and/or make window accouting 1420 * more difficult. 1421 * 1422 * XXX may want to control this with a driver 1423 * capability; this may also change when we pull 1424 * aggregation up into net80211 1425 */ 1426 seqno = ni->ni_txseqs[tid]++; 1427 *(uint16_t *)wh->i_seq = 1428 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1429 M_SEQNO_SET(m, seqno); 1430 } 1431 } else { 1432 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1433 *(uint16_t *)wh->i_seq = 1434 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1435 M_SEQNO_SET(m, seqno); 1436 } 1437 1438 1439 /* check if xmit fragmentation is required */ 1440 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1441 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1442 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1443 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1444 if (key != NULL) { 1445 /* 1446 * IEEE 802.1X: send EAPOL frames always in the clear. 1447 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1448 */ 1449 if ((m->m_flags & M_EAPOL) == 0 || 1450 ((vap->iv_flags & IEEE80211_F_WPA) && 1451 (vap->iv_opmode == IEEE80211_M_STA ? 1452 !IEEE80211_KEY_UNDEFINED(key) : 1453 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1454 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1455 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1456 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1457 eh.ether_dhost, 1458 "%s", "enmic failed, discard frame"); 1459 vap->iv_stats.is_crypto_enmicfail++; 1460 goto bad; 1461 } 1462 } 1463 } 1464 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1465 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1466 goto bad; 1467 1468 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1469 1470 IEEE80211_NODE_STAT(ni, tx_data); 1471 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1472 IEEE80211_NODE_STAT(ni, tx_mcast); 1473 m->m_flags |= M_MCAST; 1474 } else 1475 IEEE80211_NODE_STAT(ni, tx_ucast); 1476 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1477 1478 return m; 1479bad: 1480 if (m != NULL) 1481 m_freem(m); 1482 return NULL; 1483#undef WH4 1484#undef MC01 1485} 1486 1487/* 1488 * Fragment the frame according to the specified mtu. 1489 * The size of the 802.11 header (w/o padding) is provided 1490 * so we don't need to recalculate it. We create a new 1491 * mbuf for each fragment and chain it through m_nextpkt; 1492 * we might be able to optimize this by reusing the original 1493 * packet's mbufs but that is significantly more complicated. 1494 */ 1495static int 1496ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1497 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1498{ 1499 struct ieee80211_frame *wh, *whf; 1500 struct mbuf *m, *prev, *next; 1501 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1502 1503 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1504 KASSERT(m0->m_pkthdr.len > mtu, 1505 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1506 1507 wh = mtod(m0, struct ieee80211_frame *); 1508 /* NB: mark the first frag; it will be propagated below */ 1509 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1510 totalhdrsize = hdrsize + ciphdrsize; 1511 fragno = 1; 1512 off = mtu - ciphdrsize; 1513 remainder = m0->m_pkthdr.len - off; 1514 prev = m0; 1515 do { 1516 fragsize = totalhdrsize + remainder; 1517 if (fragsize > mtu) 1518 fragsize = mtu; 1519 /* XXX fragsize can be >2048! */ 1520 KASSERT(fragsize < MCLBYTES, 1521 ("fragment size %u too big!", fragsize)); 1522 if (fragsize > MHLEN) 1523 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1524 else 1525 m = m_gethdr(M_NOWAIT, MT_DATA); 1526 if (m == NULL) 1527 goto bad; 1528 /* leave room to prepend any cipher header */ 1529 m_align(m, fragsize - ciphdrsize); 1530 1531 /* 1532 * Form the header in the fragment. Note that since 1533 * we mark the first fragment with the MORE_FRAG bit 1534 * it automatically is propagated to each fragment; we 1535 * need only clear it on the last fragment (done below). 1536 * NB: frag 1+ dont have Mesh Control field present. 1537 */ 1538 whf = mtod(m, struct ieee80211_frame *); 1539 memcpy(whf, wh, hdrsize); 1540#ifdef IEEE80211_SUPPORT_MESH 1541 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1542 if (IEEE80211_IS_DSTODS(wh)) 1543 ((struct ieee80211_qosframe_addr4 *) 1544 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1545 else 1546 ((struct ieee80211_qosframe *) 1547 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1548 } 1549#endif 1550 *(uint16_t *)&whf->i_seq[0] |= htole16( 1551 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1552 IEEE80211_SEQ_FRAG_SHIFT); 1553 fragno++; 1554 1555 payload = fragsize - totalhdrsize; 1556 /* NB: destination is known to be contiguous */ 1557 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1558 m->m_len = hdrsize + payload; 1559 m->m_pkthdr.len = hdrsize + payload; 1560 m->m_flags |= M_FRAG; 1561 1562 /* chain up the fragment */ 1563 prev->m_nextpkt = m; 1564 prev = m; 1565 1566 /* deduct fragment just formed */ 1567 remainder -= payload; 1568 off += payload; 1569 } while (remainder != 0); 1570 1571 /* set the last fragment */ 1572 m->m_flags |= M_LASTFRAG; 1573 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1574 1575 /* strip first mbuf now that everything has been copied */ 1576 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1577 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1578 1579 vap->iv_stats.is_tx_fragframes++; 1580 vap->iv_stats.is_tx_frags += fragno-1; 1581 1582 return 1; 1583bad: 1584 /* reclaim fragments but leave original frame for caller to free */ 1585 for (m = m0->m_nextpkt; m != NULL; m = next) { 1586 next = m->m_nextpkt; 1587 m->m_nextpkt = NULL; /* XXX paranoid */ 1588 m_freem(m); 1589 } 1590 m0->m_nextpkt = NULL; 1591 return 0; 1592} 1593 1594/* 1595 * Add a supported rates element id to a frame. 1596 */ 1597uint8_t * 1598ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1599{ 1600 int nrates; 1601 1602 *frm++ = IEEE80211_ELEMID_RATES; 1603 nrates = rs->rs_nrates; 1604 if (nrates > IEEE80211_RATE_SIZE) 1605 nrates = IEEE80211_RATE_SIZE; 1606 *frm++ = nrates; 1607 memcpy(frm, rs->rs_rates, nrates); 1608 return frm + nrates; 1609} 1610 1611/* 1612 * Add an extended supported rates element id to a frame. 1613 */ 1614uint8_t * 1615ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1616{ 1617 /* 1618 * Add an extended supported rates element if operating in 11g mode. 1619 */ 1620 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1621 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1622 *frm++ = IEEE80211_ELEMID_XRATES; 1623 *frm++ = nrates; 1624 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1625 frm += nrates; 1626 } 1627 return frm; 1628} 1629 1630/* 1631 * Add an ssid element to a frame. 1632 */ 1633static uint8_t * 1634ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1635{ 1636 *frm++ = IEEE80211_ELEMID_SSID; 1637 *frm++ = len; 1638 memcpy(frm, ssid, len); 1639 return frm + len; 1640} 1641 1642/* 1643 * Add an erp element to a frame. 1644 */ 1645static uint8_t * 1646ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1647{ 1648 uint8_t erp; 1649 1650 *frm++ = IEEE80211_ELEMID_ERP; 1651 *frm++ = 1; 1652 erp = 0; 1653 if (ic->ic_nonerpsta != 0) 1654 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1655 if (ic->ic_flags & IEEE80211_F_USEPROT) 1656 erp |= IEEE80211_ERP_USE_PROTECTION; 1657 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1658 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1659 *frm++ = erp; 1660 return frm; 1661} 1662 1663/* 1664 * Add a CFParams element to a frame. 1665 */ 1666static uint8_t * 1667ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1668{ 1669#define ADDSHORT(frm, v) do { \ 1670 LE_WRITE_2(frm, v); \ 1671 frm += 2; \ 1672} while (0) 1673 *frm++ = IEEE80211_ELEMID_CFPARMS; 1674 *frm++ = 6; 1675 *frm++ = 0; /* CFP count */ 1676 *frm++ = 2; /* CFP period */ 1677 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1678 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1679 return frm; 1680#undef ADDSHORT 1681} 1682 1683static __inline uint8_t * 1684add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1685{ 1686 memcpy(frm, ie->ie_data, ie->ie_len); 1687 return frm + ie->ie_len; 1688} 1689 1690static __inline uint8_t * 1691add_ie(uint8_t *frm, const uint8_t *ie) 1692{ 1693 memcpy(frm, ie, 2 + ie[1]); 1694 return frm + 2 + ie[1]; 1695} 1696 1697#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1698/* 1699 * Add a WME information element to a frame. 1700 */ 1701static uint8_t * 1702ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1703{ 1704 static const struct ieee80211_wme_info info = { 1705 .wme_id = IEEE80211_ELEMID_VENDOR, 1706 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1707 .wme_oui = { WME_OUI_BYTES }, 1708 .wme_type = WME_OUI_TYPE, 1709 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1710 .wme_version = WME_VERSION, 1711 .wme_info = 0, 1712 }; 1713 memcpy(frm, &info, sizeof(info)); 1714 return frm + sizeof(info); 1715} 1716 1717/* 1718 * Add a WME parameters element to a frame. 1719 */ 1720static uint8_t * 1721ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1722{ 1723#define SM(_v, _f) (((_v) << _f##_S) & _f) 1724#define ADDSHORT(frm, v) do { \ 1725 LE_WRITE_2(frm, v); \ 1726 frm += 2; \ 1727} while (0) 1728 /* NB: this works 'cuz a param has an info at the front */ 1729 static const struct ieee80211_wme_info param = { 1730 .wme_id = IEEE80211_ELEMID_VENDOR, 1731 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1732 .wme_oui = { WME_OUI_BYTES }, 1733 .wme_type = WME_OUI_TYPE, 1734 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1735 .wme_version = WME_VERSION, 1736 }; 1737 int i; 1738 1739 memcpy(frm, ¶m, sizeof(param)); 1740 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1741 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1742 *frm++ = 0; /* reserved field */ 1743 for (i = 0; i < WME_NUM_AC; i++) { 1744 const struct wmeParams *ac = 1745 &wme->wme_bssChanParams.cap_wmeParams[i]; 1746 *frm++ = SM(i, WME_PARAM_ACI) 1747 | SM(ac->wmep_acm, WME_PARAM_ACM) 1748 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1749 ; 1750 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1751 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1752 ; 1753 ADDSHORT(frm, ac->wmep_txopLimit); 1754 } 1755 return frm; 1756#undef SM 1757#undef ADDSHORT 1758} 1759#undef WME_OUI_BYTES 1760 1761/* 1762 * Add an 11h Power Constraint element to a frame. 1763 */ 1764static uint8_t * 1765ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1766{ 1767 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1768 /* XXX per-vap tx power limit? */ 1769 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1770 1771 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1772 frm[1] = 1; 1773 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1774 return frm + 3; 1775} 1776 1777/* 1778 * Add an 11h Power Capability element to a frame. 1779 */ 1780static uint8_t * 1781ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1782{ 1783 frm[0] = IEEE80211_ELEMID_PWRCAP; 1784 frm[1] = 2; 1785 frm[2] = c->ic_minpower; 1786 frm[3] = c->ic_maxpower; 1787 return frm + 4; 1788} 1789 1790/* 1791 * Add an 11h Supported Channels element to a frame. 1792 */ 1793static uint8_t * 1794ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1795{ 1796 static const int ielen = 26; 1797 1798 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1799 frm[1] = ielen; 1800 /* XXX not correct */ 1801 memcpy(frm+2, ic->ic_chan_avail, ielen); 1802 return frm + 2 + ielen; 1803} 1804 1805/* 1806 * Add an 11h Quiet time element to a frame. 1807 */ 1808static uint8_t * 1809ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 1810{ 1811 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 1812 1813 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 1814 quiet->len = 6; 1815 if (vap->iv_quiet_count_value == 1) 1816 vap->iv_quiet_count_value = vap->iv_quiet_count; 1817 else if (vap->iv_quiet_count_value > 1) 1818 vap->iv_quiet_count_value--; 1819 1820 if (vap->iv_quiet_count_value == 0) { 1821 /* value 0 is reserved as per 802.11h standerd */ 1822 vap->iv_quiet_count_value = 1; 1823 } 1824 1825 quiet->tbttcount = vap->iv_quiet_count_value; 1826 quiet->period = vap->iv_quiet_period; 1827 quiet->duration = htole16(vap->iv_quiet_duration); 1828 quiet->offset = htole16(vap->iv_quiet_offset); 1829 return frm + sizeof(*quiet); 1830} 1831 1832/* 1833 * Add an 11h Channel Switch Announcement element to a frame. 1834 * Note that we use the per-vap CSA count to adjust the global 1835 * counter so we can use this routine to form probe response 1836 * frames and get the current count. 1837 */ 1838static uint8_t * 1839ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1840{ 1841 struct ieee80211com *ic = vap->iv_ic; 1842 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1843 1844 csa->csa_ie = IEEE80211_ELEMID_CSA; 1845 csa->csa_len = 3; 1846 csa->csa_mode = 1; /* XXX force quiet on channel */ 1847 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1848 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1849 return frm + sizeof(*csa); 1850} 1851 1852/* 1853 * Add an 11h country information element to a frame. 1854 */ 1855static uint8_t * 1856ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1857{ 1858 1859 if (ic->ic_countryie == NULL || 1860 ic->ic_countryie_chan != ic->ic_bsschan) { 1861 /* 1862 * Handle lazy construction of ie. This is done on 1863 * first use and after a channel change that requires 1864 * re-calculation. 1865 */ 1866 if (ic->ic_countryie != NULL) 1867 free(ic->ic_countryie, M_80211_NODE_IE); 1868 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1869 if (ic->ic_countryie == NULL) 1870 return frm; 1871 ic->ic_countryie_chan = ic->ic_bsschan; 1872 } 1873 return add_appie(frm, ic->ic_countryie); 1874} 1875 1876/* 1877 * Send a probe request frame with the specified ssid 1878 * and any optional information element data. 1879 */ 1880int 1881ieee80211_send_probereq(struct ieee80211_node *ni, 1882 const uint8_t sa[IEEE80211_ADDR_LEN], 1883 const uint8_t da[IEEE80211_ADDR_LEN], 1884 const uint8_t bssid[IEEE80211_ADDR_LEN], 1885 const uint8_t *ssid, size_t ssidlen) 1886{ 1887 struct ieee80211vap *vap = ni->ni_vap; 1888 struct ieee80211com *ic = ni->ni_ic; 1889 const struct ieee80211_txparam *tp; 1890 struct ieee80211_bpf_params params; 1891 struct ieee80211_frame *wh; 1892 const struct ieee80211_rateset *rs; 1893 struct mbuf *m; 1894 uint8_t *frm; 1895 int ret; 1896 1897 if (vap->iv_state == IEEE80211_S_CAC) { 1898 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1899 "block %s frame in CAC state", "probe request"); 1900 vap->iv_stats.is_tx_badstate++; 1901 return EIO; /* XXX */ 1902 } 1903 1904 /* 1905 * Hold a reference on the node so it doesn't go away until after 1906 * the xmit is complete all the way in the driver. On error we 1907 * will remove our reference. 1908 */ 1909 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1910 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1911 __func__, __LINE__, 1912 ni, ether_sprintf(ni->ni_macaddr), 1913 ieee80211_node_refcnt(ni)+1); 1914 ieee80211_ref_node(ni); 1915 1916 /* 1917 * prreq frame format 1918 * [tlv] ssid 1919 * [tlv] supported rates 1920 * [tlv] RSN (optional) 1921 * [tlv] extended supported rates 1922 * [tlv] WPA (optional) 1923 * [tlv] user-specified ie's 1924 */ 1925 m = ieee80211_getmgtframe(&frm, 1926 ic->ic_headroom + sizeof(struct ieee80211_frame), 1927 2 + IEEE80211_NWID_LEN 1928 + 2 + IEEE80211_RATE_SIZE 1929 + sizeof(struct ieee80211_ie_wpa) 1930 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1931 + sizeof(struct ieee80211_ie_wpa) 1932 + (vap->iv_appie_probereq != NULL ? 1933 vap->iv_appie_probereq->ie_len : 0) 1934 ); 1935 if (m == NULL) { 1936 vap->iv_stats.is_tx_nobuf++; 1937 ieee80211_free_node(ni); 1938 return ENOMEM; 1939 } 1940 1941 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1942 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1943 frm = ieee80211_add_rates(frm, rs); 1944 if (vap->iv_flags & IEEE80211_F_WPA2) { 1945 if (vap->iv_rsn_ie != NULL) 1946 frm = add_ie(frm, vap->iv_rsn_ie); 1947 /* XXX else complain? */ 1948 } 1949 frm = ieee80211_add_xrates(frm, rs); 1950 if (vap->iv_flags & IEEE80211_F_WPA1) { 1951 if (vap->iv_wpa_ie != NULL) 1952 frm = add_ie(frm, vap->iv_wpa_ie); 1953 /* XXX else complain? */ 1954 } 1955 if (vap->iv_appie_probereq != NULL) 1956 frm = add_appie(frm, vap->iv_appie_probereq); 1957 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1958 1959 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1960 ("leading space %zd", M_LEADINGSPACE(m))); 1961 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 1962 if (m == NULL) { 1963 /* NB: cannot happen */ 1964 ieee80211_free_node(ni); 1965 return ENOMEM; 1966 } 1967 1968 IEEE80211_TX_LOCK(ic); 1969 wh = mtod(m, struct ieee80211_frame *); 1970 ieee80211_send_setup(ni, m, 1971 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1972 IEEE80211_NONQOS_TID, sa, da, bssid); 1973 /* XXX power management? */ 1974 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1975 1976 M_WME_SETAC(m, WME_AC_BE); 1977 1978 IEEE80211_NODE_STAT(ni, tx_probereq); 1979 IEEE80211_NODE_STAT(ni, tx_mgmt); 1980 1981 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1982 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1983 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1984 ssidlen, ssid); 1985 1986 memset(¶ms, 0, sizeof(params)); 1987 params.ibp_pri = M_WME_GETAC(m); 1988 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1989 params.ibp_rate0 = tp->mgmtrate; 1990 if (IEEE80211_IS_MULTICAST(da)) { 1991 params.ibp_flags |= IEEE80211_BPF_NOACK; 1992 params.ibp_try0 = 1; 1993 } else 1994 params.ibp_try0 = tp->maxretry; 1995 params.ibp_power = ni->ni_txpower; 1996 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 1997 IEEE80211_TX_UNLOCK(ic); 1998 return (ret); 1999} 2000 2001/* 2002 * Calculate capability information for mgt frames. 2003 */ 2004uint16_t 2005ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2006{ 2007 struct ieee80211com *ic = vap->iv_ic; 2008 uint16_t capinfo; 2009 2010 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2011 2012 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2013 capinfo = IEEE80211_CAPINFO_ESS; 2014 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2015 capinfo = IEEE80211_CAPINFO_IBSS; 2016 else 2017 capinfo = 0; 2018 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2019 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2020 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2021 IEEE80211_IS_CHAN_2GHZ(chan)) 2022 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2023 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2024 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2025 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2026 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2027 return capinfo; 2028} 2029 2030/* 2031 * Send a management frame. The node is for the destination (or ic_bss 2032 * when in station mode). Nodes other than ic_bss have their reference 2033 * count bumped to reflect our use for an indeterminant time. 2034 */ 2035int 2036ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2037{ 2038#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2039#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2040 struct ieee80211vap *vap = ni->ni_vap; 2041 struct ieee80211com *ic = ni->ni_ic; 2042 struct ieee80211_node *bss = vap->iv_bss; 2043 struct ieee80211_bpf_params params; 2044 struct mbuf *m; 2045 uint8_t *frm; 2046 uint16_t capinfo; 2047 int has_challenge, is_shared_key, ret, status; 2048 2049 KASSERT(ni != NULL, ("null node")); 2050 2051 /* 2052 * Hold a reference on the node so it doesn't go away until after 2053 * the xmit is complete all the way in the driver. On error we 2054 * will remove our reference. 2055 */ 2056 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2057 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2058 __func__, __LINE__, 2059 ni, ether_sprintf(ni->ni_macaddr), 2060 ieee80211_node_refcnt(ni)+1); 2061 ieee80211_ref_node(ni); 2062 2063 memset(¶ms, 0, sizeof(params)); 2064 switch (type) { 2065 2066 case IEEE80211_FC0_SUBTYPE_AUTH: 2067 status = arg >> 16; 2068 arg &= 0xffff; 2069 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2070 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2071 ni->ni_challenge != NULL); 2072 2073 /* 2074 * Deduce whether we're doing open authentication or 2075 * shared key authentication. We do the latter if 2076 * we're in the middle of a shared key authentication 2077 * handshake or if we're initiating an authentication 2078 * request and configured to use shared key. 2079 */ 2080 is_shared_key = has_challenge || 2081 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2082 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2083 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2084 2085 m = ieee80211_getmgtframe(&frm, 2086 ic->ic_headroom + sizeof(struct ieee80211_frame), 2087 3 * sizeof(uint16_t) 2088 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2089 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2090 ); 2091 if (m == NULL) 2092 senderr(ENOMEM, is_tx_nobuf); 2093 2094 ((uint16_t *)frm)[0] = 2095 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2096 : htole16(IEEE80211_AUTH_ALG_OPEN); 2097 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2098 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2099 2100 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2101 ((uint16_t *)frm)[3] = 2102 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2103 IEEE80211_ELEMID_CHALLENGE); 2104 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2105 IEEE80211_CHALLENGE_LEN); 2106 m->m_pkthdr.len = m->m_len = 2107 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2108 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2109 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2110 "request encrypt frame (%s)", __func__); 2111 /* mark frame for encryption */ 2112 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2113 } 2114 } else 2115 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2116 2117 /* XXX not right for shared key */ 2118 if (status == IEEE80211_STATUS_SUCCESS) 2119 IEEE80211_NODE_STAT(ni, tx_auth); 2120 else 2121 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2122 2123 if (vap->iv_opmode == IEEE80211_M_STA) 2124 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2125 (void *) vap->iv_state); 2126 break; 2127 2128 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2129 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2130 "send station deauthenticate (reason %d)", arg); 2131 m = ieee80211_getmgtframe(&frm, 2132 ic->ic_headroom + sizeof(struct ieee80211_frame), 2133 sizeof(uint16_t)); 2134 if (m == NULL) 2135 senderr(ENOMEM, is_tx_nobuf); 2136 *(uint16_t *)frm = htole16(arg); /* reason */ 2137 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2138 2139 IEEE80211_NODE_STAT(ni, tx_deauth); 2140 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2141 2142 ieee80211_node_unauthorize(ni); /* port closed */ 2143 break; 2144 2145 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2146 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2147 /* 2148 * asreq frame format 2149 * [2] capability information 2150 * [2] listen interval 2151 * [6*] current AP address (reassoc only) 2152 * [tlv] ssid 2153 * [tlv] supported rates 2154 * [tlv] extended supported rates 2155 * [4] power capability (optional) 2156 * [28] supported channels (optional) 2157 * [tlv] HT capabilities 2158 * [tlv] WME (optional) 2159 * [tlv] Vendor OUI HT capabilities (optional) 2160 * [tlv] Atheros capabilities (if negotiated) 2161 * [tlv] AppIE's (optional) 2162 */ 2163 m = ieee80211_getmgtframe(&frm, 2164 ic->ic_headroom + sizeof(struct ieee80211_frame), 2165 sizeof(uint16_t) 2166 + sizeof(uint16_t) 2167 + IEEE80211_ADDR_LEN 2168 + 2 + IEEE80211_NWID_LEN 2169 + 2 + IEEE80211_RATE_SIZE 2170 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2171 + 4 2172 + 2 + 26 2173 + sizeof(struct ieee80211_wme_info) 2174 + sizeof(struct ieee80211_ie_htcap) 2175 + 4 + sizeof(struct ieee80211_ie_htcap) 2176#ifdef IEEE80211_SUPPORT_SUPERG 2177 + sizeof(struct ieee80211_ath_ie) 2178#endif 2179 + (vap->iv_appie_wpa != NULL ? 2180 vap->iv_appie_wpa->ie_len : 0) 2181 + (vap->iv_appie_assocreq != NULL ? 2182 vap->iv_appie_assocreq->ie_len : 0) 2183 ); 2184 if (m == NULL) 2185 senderr(ENOMEM, is_tx_nobuf); 2186 2187 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2188 ("wrong mode %u", vap->iv_opmode)); 2189 capinfo = IEEE80211_CAPINFO_ESS; 2190 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2191 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2192 /* 2193 * NB: Some 11a AP's reject the request when 2194 * short premable is set. 2195 */ 2196 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2197 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2198 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2199 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2200 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2201 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2202 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2203 (vap->iv_flags & IEEE80211_F_DOTH)) 2204 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2205 *(uint16_t *)frm = htole16(capinfo); 2206 frm += 2; 2207 2208 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2209 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2210 bss->ni_intval)); 2211 frm += 2; 2212 2213 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2214 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2215 frm += IEEE80211_ADDR_LEN; 2216 } 2217 2218 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2219 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2220 if (vap->iv_flags & IEEE80211_F_WPA2) { 2221 if (vap->iv_rsn_ie != NULL) 2222 frm = add_ie(frm, vap->iv_rsn_ie); 2223 /* XXX else complain? */ 2224 } 2225 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2226 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2227 frm = ieee80211_add_powercapability(frm, 2228 ic->ic_curchan); 2229 frm = ieee80211_add_supportedchannels(frm, ic); 2230 } 2231 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2232 ni->ni_ies.htcap_ie != NULL && 2233 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2234 frm = ieee80211_add_htcap(frm, ni); 2235 if (vap->iv_flags & IEEE80211_F_WPA1) { 2236 if (vap->iv_wpa_ie != NULL) 2237 frm = add_ie(frm, vap->iv_wpa_ie); 2238 /* XXX else complain */ 2239 } 2240 if ((ic->ic_flags & IEEE80211_F_WME) && 2241 ni->ni_ies.wme_ie != NULL) 2242 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2243 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2244 ni->ni_ies.htcap_ie != NULL && 2245 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2246 frm = ieee80211_add_htcap_vendor(frm, ni); 2247#ifdef IEEE80211_SUPPORT_SUPERG 2248 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2249 frm = ieee80211_add_ath(frm, 2250 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2251 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2252 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2253 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2254 } 2255#endif /* IEEE80211_SUPPORT_SUPERG */ 2256 if (vap->iv_appie_assocreq != NULL) 2257 frm = add_appie(frm, vap->iv_appie_assocreq); 2258 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2259 2260 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2261 (void *) vap->iv_state); 2262 break; 2263 2264 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2265 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2266 /* 2267 * asresp frame format 2268 * [2] capability information 2269 * [2] status 2270 * [2] association ID 2271 * [tlv] supported rates 2272 * [tlv] extended supported rates 2273 * [tlv] HT capabilities (standard, if STA enabled) 2274 * [tlv] HT information (standard, if STA enabled) 2275 * [tlv] WME (if configured and STA enabled) 2276 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2277 * [tlv] HT information (vendor OUI, if STA enabled) 2278 * [tlv] Atheros capabilities (if STA enabled) 2279 * [tlv] AppIE's (optional) 2280 */ 2281 m = ieee80211_getmgtframe(&frm, 2282 ic->ic_headroom + sizeof(struct ieee80211_frame), 2283 sizeof(uint16_t) 2284 + sizeof(uint16_t) 2285 + sizeof(uint16_t) 2286 + 2 + IEEE80211_RATE_SIZE 2287 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2288 + sizeof(struct ieee80211_ie_htcap) + 4 2289 + sizeof(struct ieee80211_ie_htinfo) + 4 2290 + sizeof(struct ieee80211_wme_param) 2291#ifdef IEEE80211_SUPPORT_SUPERG 2292 + sizeof(struct ieee80211_ath_ie) 2293#endif 2294 + (vap->iv_appie_assocresp != NULL ? 2295 vap->iv_appie_assocresp->ie_len : 0) 2296 ); 2297 if (m == NULL) 2298 senderr(ENOMEM, is_tx_nobuf); 2299 2300 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2301 *(uint16_t *)frm = htole16(capinfo); 2302 frm += 2; 2303 2304 *(uint16_t *)frm = htole16(arg); /* status */ 2305 frm += 2; 2306 2307 if (arg == IEEE80211_STATUS_SUCCESS) { 2308 *(uint16_t *)frm = htole16(ni->ni_associd); 2309 IEEE80211_NODE_STAT(ni, tx_assoc); 2310 } else 2311 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2312 frm += 2; 2313 2314 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2315 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2316 /* NB: respond according to what we received */ 2317 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2318 frm = ieee80211_add_htcap(frm, ni); 2319 frm = ieee80211_add_htinfo(frm, ni); 2320 } 2321 if ((vap->iv_flags & IEEE80211_F_WME) && 2322 ni->ni_ies.wme_ie != NULL) 2323 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2324 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2325 frm = ieee80211_add_htcap_vendor(frm, ni); 2326 frm = ieee80211_add_htinfo_vendor(frm, ni); 2327 } 2328#ifdef IEEE80211_SUPPORT_SUPERG 2329 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2330 frm = ieee80211_add_ath(frm, 2331 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2332 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2333 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2334 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2335#endif /* IEEE80211_SUPPORT_SUPERG */ 2336 if (vap->iv_appie_assocresp != NULL) 2337 frm = add_appie(frm, vap->iv_appie_assocresp); 2338 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2339 break; 2340 2341 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2342 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2343 "send station disassociate (reason %d)", arg); 2344 m = ieee80211_getmgtframe(&frm, 2345 ic->ic_headroom + sizeof(struct ieee80211_frame), 2346 sizeof(uint16_t)); 2347 if (m == NULL) 2348 senderr(ENOMEM, is_tx_nobuf); 2349 *(uint16_t *)frm = htole16(arg); /* reason */ 2350 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2351 2352 IEEE80211_NODE_STAT(ni, tx_disassoc); 2353 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2354 break; 2355 2356 default: 2357 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2358 "invalid mgmt frame type %u", type); 2359 senderr(EINVAL, is_tx_unknownmgt); 2360 /* NOTREACHED */ 2361 } 2362 2363 /* NB: force non-ProbeResp frames to the highest queue */ 2364 params.ibp_pri = WME_AC_VO; 2365 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2366 /* NB: we know all frames are unicast */ 2367 params.ibp_try0 = bss->ni_txparms->maxretry; 2368 params.ibp_power = bss->ni_txpower; 2369 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2370bad: 2371 ieee80211_free_node(ni); 2372 return ret; 2373#undef senderr 2374#undef HTFLAGS 2375} 2376 2377/* 2378 * Return an mbuf with a probe response frame in it. 2379 * Space is left to prepend and 802.11 header at the 2380 * front but it's left to the caller to fill in. 2381 */ 2382struct mbuf * 2383ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2384{ 2385 struct ieee80211vap *vap = bss->ni_vap; 2386 struct ieee80211com *ic = bss->ni_ic; 2387 const struct ieee80211_rateset *rs; 2388 struct mbuf *m; 2389 uint16_t capinfo; 2390 uint8_t *frm; 2391 2392 /* 2393 * probe response frame format 2394 * [8] time stamp 2395 * [2] beacon interval 2396 * [2] cabability information 2397 * [tlv] ssid 2398 * [tlv] supported rates 2399 * [tlv] parameter set (FH/DS) 2400 * [tlv] parameter set (IBSS) 2401 * [tlv] country (optional) 2402 * [3] power control (optional) 2403 * [5] channel switch announcement (CSA) (optional) 2404 * [tlv] extended rate phy (ERP) 2405 * [tlv] extended supported rates 2406 * [tlv] RSN (optional) 2407 * [tlv] HT capabilities 2408 * [tlv] HT information 2409 * [tlv] WPA (optional) 2410 * [tlv] WME (optional) 2411 * [tlv] Vendor OUI HT capabilities (optional) 2412 * [tlv] Vendor OUI HT information (optional) 2413 * [tlv] Atheros capabilities 2414 * [tlv] AppIE's (optional) 2415 * [tlv] Mesh ID (MBSS) 2416 * [tlv] Mesh Conf (MBSS) 2417 */ 2418 m = ieee80211_getmgtframe(&frm, 2419 ic->ic_headroom + sizeof(struct ieee80211_frame), 2420 8 2421 + sizeof(uint16_t) 2422 + sizeof(uint16_t) 2423 + 2 + IEEE80211_NWID_LEN 2424 + 2 + IEEE80211_RATE_SIZE 2425 + 7 /* max(7,3) */ 2426 + IEEE80211_COUNTRY_MAX_SIZE 2427 + 3 2428 + sizeof(struct ieee80211_csa_ie) 2429 + sizeof(struct ieee80211_quiet_ie) 2430 + 3 2431 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2432 + sizeof(struct ieee80211_ie_wpa) 2433 + sizeof(struct ieee80211_ie_htcap) 2434 + sizeof(struct ieee80211_ie_htinfo) 2435 + sizeof(struct ieee80211_ie_wpa) 2436 + sizeof(struct ieee80211_wme_param) 2437 + 4 + sizeof(struct ieee80211_ie_htcap) 2438 + 4 + sizeof(struct ieee80211_ie_htinfo) 2439#ifdef IEEE80211_SUPPORT_SUPERG 2440 + sizeof(struct ieee80211_ath_ie) 2441#endif 2442#ifdef IEEE80211_SUPPORT_MESH 2443 + 2 + IEEE80211_MESHID_LEN 2444 + sizeof(struct ieee80211_meshconf_ie) 2445#endif 2446 + (vap->iv_appie_proberesp != NULL ? 2447 vap->iv_appie_proberesp->ie_len : 0) 2448 ); 2449 if (m == NULL) { 2450 vap->iv_stats.is_tx_nobuf++; 2451 return NULL; 2452 } 2453 2454 memset(frm, 0, 8); /* timestamp should be filled later */ 2455 frm += 8; 2456 *(uint16_t *)frm = htole16(bss->ni_intval); 2457 frm += 2; 2458 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2459 *(uint16_t *)frm = htole16(capinfo); 2460 frm += 2; 2461 2462 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2463 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2464 frm = ieee80211_add_rates(frm, rs); 2465 2466 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2467 *frm++ = IEEE80211_ELEMID_FHPARMS; 2468 *frm++ = 5; 2469 *frm++ = bss->ni_fhdwell & 0x00ff; 2470 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2471 *frm++ = IEEE80211_FH_CHANSET( 2472 ieee80211_chan2ieee(ic, bss->ni_chan)); 2473 *frm++ = IEEE80211_FH_CHANPAT( 2474 ieee80211_chan2ieee(ic, bss->ni_chan)); 2475 *frm++ = bss->ni_fhindex; 2476 } else { 2477 *frm++ = IEEE80211_ELEMID_DSPARMS; 2478 *frm++ = 1; 2479 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2480 } 2481 2482 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2483 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2484 *frm++ = 2; 2485 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2486 } 2487 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2488 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2489 frm = ieee80211_add_countryie(frm, ic); 2490 if (vap->iv_flags & IEEE80211_F_DOTH) { 2491 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2492 frm = ieee80211_add_powerconstraint(frm, vap); 2493 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2494 frm = ieee80211_add_csa(frm, vap); 2495 } 2496 if (vap->iv_flags & IEEE80211_F_DOTH) { 2497 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2498 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2499 if (vap->iv_quiet) 2500 frm = ieee80211_add_quiet(frm, vap); 2501 } 2502 } 2503 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2504 frm = ieee80211_add_erp(frm, ic); 2505 frm = ieee80211_add_xrates(frm, rs); 2506 if (vap->iv_flags & IEEE80211_F_WPA2) { 2507 if (vap->iv_rsn_ie != NULL) 2508 frm = add_ie(frm, vap->iv_rsn_ie); 2509 /* XXX else complain? */ 2510 } 2511 /* 2512 * NB: legacy 11b clients do not get certain ie's. 2513 * The caller identifies such clients by passing 2514 * a token in legacy to us. Could expand this to be 2515 * any legacy client for stuff like HT ie's. 2516 */ 2517 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2518 legacy != IEEE80211_SEND_LEGACY_11B) { 2519 frm = ieee80211_add_htcap(frm, bss); 2520 frm = ieee80211_add_htinfo(frm, bss); 2521 } 2522 if (vap->iv_flags & IEEE80211_F_WPA1) { 2523 if (vap->iv_wpa_ie != NULL) 2524 frm = add_ie(frm, vap->iv_wpa_ie); 2525 /* XXX else complain? */ 2526 } 2527 if (vap->iv_flags & IEEE80211_F_WME) 2528 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2529 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2530 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2531 legacy != IEEE80211_SEND_LEGACY_11B) { 2532 frm = ieee80211_add_htcap_vendor(frm, bss); 2533 frm = ieee80211_add_htinfo_vendor(frm, bss); 2534 } 2535#ifdef IEEE80211_SUPPORT_SUPERG 2536 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2537 legacy != IEEE80211_SEND_LEGACY_11B) 2538 frm = ieee80211_add_athcaps(frm, bss); 2539#endif 2540 if (vap->iv_appie_proberesp != NULL) 2541 frm = add_appie(frm, vap->iv_appie_proberesp); 2542#ifdef IEEE80211_SUPPORT_MESH 2543 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2544 frm = ieee80211_add_meshid(frm, vap); 2545 frm = ieee80211_add_meshconf(frm, vap); 2546 } 2547#endif 2548 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2549 2550 return m; 2551} 2552 2553/* 2554 * Send a probe response frame to the specified mac address. 2555 * This does not go through the normal mgt frame api so we 2556 * can specify the destination address and re-use the bss node 2557 * for the sta reference. 2558 */ 2559int 2560ieee80211_send_proberesp(struct ieee80211vap *vap, 2561 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2562{ 2563 struct ieee80211_node *bss = vap->iv_bss; 2564 struct ieee80211com *ic = vap->iv_ic; 2565 struct ieee80211_frame *wh; 2566 struct mbuf *m; 2567 int ret; 2568 2569 if (vap->iv_state == IEEE80211_S_CAC) { 2570 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2571 "block %s frame in CAC state", "probe response"); 2572 vap->iv_stats.is_tx_badstate++; 2573 return EIO; /* XXX */ 2574 } 2575 2576 /* 2577 * Hold a reference on the node so it doesn't go away until after 2578 * the xmit is complete all the way in the driver. On error we 2579 * will remove our reference. 2580 */ 2581 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2582 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2583 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2584 ieee80211_node_refcnt(bss)+1); 2585 ieee80211_ref_node(bss); 2586 2587 m = ieee80211_alloc_proberesp(bss, legacy); 2588 if (m == NULL) { 2589 ieee80211_free_node(bss); 2590 return ENOMEM; 2591 } 2592 2593 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2594 KASSERT(m != NULL, ("no room for header")); 2595 2596 IEEE80211_TX_LOCK(ic); 2597 wh = mtod(m, struct ieee80211_frame *); 2598 ieee80211_send_setup(bss, m, 2599 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2600 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2601 /* XXX power management? */ 2602 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2603 2604 M_WME_SETAC(m, WME_AC_BE); 2605 2606 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2607 "send probe resp on channel %u to %s%s\n", 2608 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2609 legacy ? " <legacy>" : ""); 2610 IEEE80211_NODE_STAT(bss, tx_mgmt); 2611 2612 ret = ieee80211_raw_output(vap, bss, m, NULL); 2613 IEEE80211_TX_UNLOCK(ic); 2614 return (ret); 2615} 2616 2617/* 2618 * Allocate and build a RTS (Request To Send) control frame. 2619 */ 2620struct mbuf * 2621ieee80211_alloc_rts(struct ieee80211com *ic, 2622 const uint8_t ra[IEEE80211_ADDR_LEN], 2623 const uint8_t ta[IEEE80211_ADDR_LEN], 2624 uint16_t dur) 2625{ 2626 struct ieee80211_frame_rts *rts; 2627 struct mbuf *m; 2628 2629 /* XXX honor ic_headroom */ 2630 m = m_gethdr(M_NOWAIT, MT_DATA); 2631 if (m != NULL) { 2632 rts = mtod(m, struct ieee80211_frame_rts *); 2633 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2634 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2635 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2636 *(u_int16_t *)rts->i_dur = htole16(dur); 2637 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2638 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2639 2640 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2641 } 2642 return m; 2643} 2644 2645/* 2646 * Allocate and build a CTS (Clear To Send) control frame. 2647 */ 2648struct mbuf * 2649ieee80211_alloc_cts(struct ieee80211com *ic, 2650 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2651{ 2652 struct ieee80211_frame_cts *cts; 2653 struct mbuf *m; 2654 2655 /* XXX honor ic_headroom */ 2656 m = m_gethdr(M_NOWAIT, MT_DATA); 2657 if (m != NULL) { 2658 cts = mtod(m, struct ieee80211_frame_cts *); 2659 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2660 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2661 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2662 *(u_int16_t *)cts->i_dur = htole16(dur); 2663 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2664 2665 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2666 } 2667 return m; 2668} 2669 2670static void 2671ieee80211_tx_mgt_timeout(void *arg) 2672{ 2673 struct ieee80211_node *ni = arg; 2674 struct ieee80211vap *vap = ni->ni_vap; 2675 2676 if (vap->iv_state != IEEE80211_S_INIT && 2677 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2678 /* 2679 * NB: it's safe to specify a timeout as the reason here; 2680 * it'll only be used in the right state. 2681 */ 2682 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2683 IEEE80211_SCAN_FAIL_TIMEOUT); 2684 } 2685} 2686 2687static void 2688ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2689{ 2690 struct ieee80211vap *vap = ni->ni_vap; 2691 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2692 2693 /* 2694 * Frame transmit completed; arrange timer callback. If 2695 * transmit was successfuly we wait for response. Otherwise 2696 * we arrange an immediate callback instead of doing the 2697 * callback directly since we don't know what state the driver 2698 * is in (e.g. what locks it is holding). This work should 2699 * not be too time-critical and not happen too often so the 2700 * added overhead is acceptable. 2701 * 2702 * XXX what happens if !acked but response shows up before callback? 2703 */ 2704 if (vap->iv_state == ostate) 2705 callout_reset(&vap->iv_mgtsend, 2706 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2707 ieee80211_tx_mgt_timeout, ni); 2708} 2709 2710static void 2711ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2712 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2713{ 2714 struct ieee80211vap *vap = ni->ni_vap; 2715 struct ieee80211com *ic = ni->ni_ic; 2716 struct ieee80211_rateset *rs = &ni->ni_rates; 2717 uint16_t capinfo; 2718 2719 /* 2720 * beacon frame format 2721 * [8] time stamp 2722 * [2] beacon interval 2723 * [2] cabability information 2724 * [tlv] ssid 2725 * [tlv] supported rates 2726 * [3] parameter set (DS) 2727 * [8] CF parameter set (optional) 2728 * [tlv] parameter set (IBSS/TIM) 2729 * [tlv] country (optional) 2730 * [3] power control (optional) 2731 * [5] channel switch announcement (CSA) (optional) 2732 * [tlv] extended rate phy (ERP) 2733 * [tlv] extended supported rates 2734 * [tlv] RSN parameters 2735 * [tlv] HT capabilities 2736 * [tlv] HT information 2737 * XXX Vendor-specific OIDs (e.g. Atheros) 2738 * [tlv] WPA parameters 2739 * [tlv] WME parameters 2740 * [tlv] Vendor OUI HT capabilities (optional) 2741 * [tlv] Vendor OUI HT information (optional) 2742 * [tlv] Atheros capabilities (optional) 2743 * [tlv] TDMA parameters (optional) 2744 * [tlv] Mesh ID (MBSS) 2745 * [tlv] Mesh Conf (MBSS) 2746 * [tlv] application data (optional) 2747 */ 2748 2749 memset(bo, 0, sizeof(*bo)); 2750 2751 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2752 frm += 8; 2753 *(uint16_t *)frm = htole16(ni->ni_intval); 2754 frm += 2; 2755 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2756 bo->bo_caps = (uint16_t *)frm; 2757 *(uint16_t *)frm = htole16(capinfo); 2758 frm += 2; 2759 *frm++ = IEEE80211_ELEMID_SSID; 2760 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2761 *frm++ = ni->ni_esslen; 2762 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2763 frm += ni->ni_esslen; 2764 } else 2765 *frm++ = 0; 2766 frm = ieee80211_add_rates(frm, rs); 2767 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2768 *frm++ = IEEE80211_ELEMID_DSPARMS; 2769 *frm++ = 1; 2770 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2771 } 2772 if (ic->ic_flags & IEEE80211_F_PCF) { 2773 bo->bo_cfp = frm; 2774 frm = ieee80211_add_cfparms(frm, ic); 2775 } 2776 bo->bo_tim = frm; 2777 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2778 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2779 *frm++ = 2; 2780 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2781 bo->bo_tim_len = 0; 2782 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2783 vap->iv_opmode == IEEE80211_M_MBSS) { 2784 /* TIM IE is the same for Mesh and Hostap */ 2785 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2786 2787 tie->tim_ie = IEEE80211_ELEMID_TIM; 2788 tie->tim_len = 4; /* length */ 2789 tie->tim_count = 0; /* DTIM count */ 2790 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2791 tie->tim_bitctl = 0; /* bitmap control */ 2792 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2793 frm += sizeof(struct ieee80211_tim_ie); 2794 bo->bo_tim_len = 1; 2795 } 2796 bo->bo_tim_trailer = frm; 2797 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2798 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2799 frm = ieee80211_add_countryie(frm, ic); 2800 if (vap->iv_flags & IEEE80211_F_DOTH) { 2801 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2802 frm = ieee80211_add_powerconstraint(frm, vap); 2803 bo->bo_csa = frm; 2804 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2805 frm = ieee80211_add_csa(frm, vap); 2806 } else 2807 bo->bo_csa = frm; 2808 2809 if (vap->iv_flags & IEEE80211_F_DOTH) { 2810 bo->bo_quiet = frm; 2811 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2812 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2813 if (vap->iv_quiet) 2814 frm = ieee80211_add_quiet(frm,vap); 2815 } 2816 } else 2817 bo->bo_quiet = frm; 2818 2819 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2820 bo->bo_erp = frm; 2821 frm = ieee80211_add_erp(frm, ic); 2822 } 2823 frm = ieee80211_add_xrates(frm, rs); 2824 if (vap->iv_flags & IEEE80211_F_WPA2) { 2825 if (vap->iv_rsn_ie != NULL) 2826 frm = add_ie(frm, vap->iv_rsn_ie); 2827 /* XXX else complain */ 2828 } 2829 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2830 frm = ieee80211_add_htcap(frm, ni); 2831 bo->bo_htinfo = frm; 2832 frm = ieee80211_add_htinfo(frm, ni); 2833 } 2834 if (vap->iv_flags & IEEE80211_F_WPA1) { 2835 if (vap->iv_wpa_ie != NULL) 2836 frm = add_ie(frm, vap->iv_wpa_ie); 2837 /* XXX else complain */ 2838 } 2839 if (vap->iv_flags & IEEE80211_F_WME) { 2840 bo->bo_wme = frm; 2841 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2842 } 2843 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2844 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2845 frm = ieee80211_add_htcap_vendor(frm, ni); 2846 frm = ieee80211_add_htinfo_vendor(frm, ni); 2847 } 2848#ifdef IEEE80211_SUPPORT_SUPERG 2849 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2850 bo->bo_ath = frm; 2851 frm = ieee80211_add_athcaps(frm, ni); 2852 } 2853#endif 2854#ifdef IEEE80211_SUPPORT_TDMA 2855 if (vap->iv_caps & IEEE80211_C_TDMA) { 2856 bo->bo_tdma = frm; 2857 frm = ieee80211_add_tdma(frm, vap); 2858 } 2859#endif 2860 if (vap->iv_appie_beacon != NULL) { 2861 bo->bo_appie = frm; 2862 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2863 frm = add_appie(frm, vap->iv_appie_beacon); 2864 } 2865#ifdef IEEE80211_SUPPORT_MESH 2866 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2867 frm = ieee80211_add_meshid(frm, vap); 2868 bo->bo_meshconf = frm; 2869 frm = ieee80211_add_meshconf(frm, vap); 2870 } 2871#endif 2872 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2873 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2874 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2875} 2876 2877/* 2878 * Allocate a beacon frame and fillin the appropriate bits. 2879 */ 2880struct mbuf * 2881ieee80211_beacon_alloc(struct ieee80211_node *ni, 2882 struct ieee80211_beacon_offsets *bo) 2883{ 2884 struct ieee80211vap *vap = ni->ni_vap; 2885 struct ieee80211com *ic = ni->ni_ic; 2886 struct ifnet *ifp = vap->iv_ifp; 2887 struct ieee80211_frame *wh; 2888 struct mbuf *m; 2889 int pktlen; 2890 uint8_t *frm; 2891 2892 /* 2893 * beacon frame format 2894 * [8] time stamp 2895 * [2] beacon interval 2896 * [2] cabability information 2897 * [tlv] ssid 2898 * [tlv] supported rates 2899 * [3] parameter set (DS) 2900 * [8] CF parameter set (optional) 2901 * [tlv] parameter set (IBSS/TIM) 2902 * [tlv] country (optional) 2903 * [3] power control (optional) 2904 * [5] channel switch announcement (CSA) (optional) 2905 * [tlv] extended rate phy (ERP) 2906 * [tlv] extended supported rates 2907 * [tlv] RSN parameters 2908 * [tlv] HT capabilities 2909 * [tlv] HT information 2910 * [tlv] Vendor OUI HT capabilities (optional) 2911 * [tlv] Vendor OUI HT information (optional) 2912 * XXX Vendor-specific OIDs (e.g. Atheros) 2913 * [tlv] WPA parameters 2914 * [tlv] WME parameters 2915 * [tlv] TDMA parameters (optional) 2916 * [tlv] Mesh ID (MBSS) 2917 * [tlv] Mesh Conf (MBSS) 2918 * [tlv] application data (optional) 2919 * NB: we allocate the max space required for the TIM bitmap. 2920 * XXX how big is this? 2921 */ 2922 pktlen = 8 /* time stamp */ 2923 + sizeof(uint16_t) /* beacon interval */ 2924 + sizeof(uint16_t) /* capabilities */ 2925 + 2 + ni->ni_esslen /* ssid */ 2926 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2927 + 2 + 1 /* DS parameters */ 2928 + 2 + 6 /* CF parameters */ 2929 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2930 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2931 + 2 + 1 /* power control */ 2932 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2933 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 2934 + 2 + 1 /* ERP */ 2935 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2936 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2937 2*sizeof(struct ieee80211_ie_wpa) : 0) 2938 /* XXX conditional? */ 2939 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2940 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2941 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2942 sizeof(struct ieee80211_wme_param) : 0) 2943#ifdef IEEE80211_SUPPORT_SUPERG 2944 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2945#endif 2946#ifdef IEEE80211_SUPPORT_TDMA 2947 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2948 sizeof(struct ieee80211_tdma_param) : 0) 2949#endif 2950#ifdef IEEE80211_SUPPORT_MESH 2951 + 2 + ni->ni_meshidlen 2952 + sizeof(struct ieee80211_meshconf_ie) 2953#endif 2954 + IEEE80211_MAX_APPIE 2955 ; 2956 m = ieee80211_getmgtframe(&frm, 2957 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2958 if (m == NULL) { 2959 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2960 "%s: cannot get buf; size %u\n", __func__, pktlen); 2961 vap->iv_stats.is_tx_nobuf++; 2962 return NULL; 2963 } 2964 ieee80211_beacon_construct(m, frm, bo, ni); 2965 2966 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2967 KASSERT(m != NULL, ("no space for 802.11 header?")); 2968 wh = mtod(m, struct ieee80211_frame *); 2969 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2970 IEEE80211_FC0_SUBTYPE_BEACON; 2971 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2972 *(uint16_t *)wh->i_dur = 0; 2973 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2974 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2975 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2976 *(uint16_t *)wh->i_seq = 0; 2977 2978 return m; 2979} 2980 2981/* 2982 * Update the dynamic parts of a beacon frame based on the current state. 2983 */ 2984int 2985ieee80211_beacon_update(struct ieee80211_node *ni, 2986 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2987{ 2988 struct ieee80211vap *vap = ni->ni_vap; 2989 struct ieee80211com *ic = ni->ni_ic; 2990 int len_changed = 0; 2991 uint16_t capinfo; 2992 struct ieee80211_frame *wh; 2993 ieee80211_seq seqno; 2994 2995 IEEE80211_LOCK(ic); 2996 /* 2997 * Handle 11h channel change when we've reached the count. 2998 * We must recalculate the beacon frame contents to account 2999 * for the new channel. Note we do this only for the first 3000 * vap that reaches this point; subsequent vaps just update 3001 * their beacon state to reflect the recalculated channel. 3002 */ 3003 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3004 vap->iv_csa_count == ic->ic_csa_count) { 3005 vap->iv_csa_count = 0; 3006 /* 3007 * Effect channel change before reconstructing the beacon 3008 * frame contents as many places reference ni_chan. 3009 */ 3010 if (ic->ic_csa_newchan != NULL) 3011 ieee80211_csa_completeswitch(ic); 3012 /* 3013 * NB: ieee80211_beacon_construct clears all pending 3014 * updates in bo_flags so we don't need to explicitly 3015 * clear IEEE80211_BEACON_CSA. 3016 */ 3017 ieee80211_beacon_construct(m, 3018 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 3019 3020 /* XXX do WME aggressive mode processing? */ 3021 IEEE80211_UNLOCK(ic); 3022 return 1; /* just assume length changed */ 3023 } 3024 3025 wh = mtod(m, struct ieee80211_frame *); 3026 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3027 *(uint16_t *)&wh->i_seq[0] = 3028 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3029 M_SEQNO_SET(m, seqno); 3030 3031 /* XXX faster to recalculate entirely or just changes? */ 3032 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3033 *bo->bo_caps = htole16(capinfo); 3034 3035 if (vap->iv_flags & IEEE80211_F_WME) { 3036 struct ieee80211_wme_state *wme = &ic->ic_wme; 3037 3038 /* 3039 * Check for agressive mode change. When there is 3040 * significant high priority traffic in the BSS 3041 * throttle back BE traffic by using conservative 3042 * parameters. Otherwise BE uses agressive params 3043 * to optimize performance of legacy/non-QoS traffic. 3044 */ 3045 if (wme->wme_flags & WME_F_AGGRMODE) { 3046 if (wme->wme_hipri_traffic > 3047 wme->wme_hipri_switch_thresh) { 3048 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3049 "%s: traffic %u, disable aggressive mode\n", 3050 __func__, wme->wme_hipri_traffic); 3051 wme->wme_flags &= ~WME_F_AGGRMODE; 3052 ieee80211_wme_updateparams_locked(vap); 3053 wme->wme_hipri_traffic = 3054 wme->wme_hipri_switch_hysteresis; 3055 } else 3056 wme->wme_hipri_traffic = 0; 3057 } else { 3058 if (wme->wme_hipri_traffic <= 3059 wme->wme_hipri_switch_thresh) { 3060 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3061 "%s: traffic %u, enable aggressive mode\n", 3062 __func__, wme->wme_hipri_traffic); 3063 wme->wme_flags |= WME_F_AGGRMODE; 3064 ieee80211_wme_updateparams_locked(vap); 3065 wme->wme_hipri_traffic = 0; 3066 } else 3067 wme->wme_hipri_traffic = 3068 wme->wme_hipri_switch_hysteresis; 3069 } 3070 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3071 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3072 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3073 } 3074 } 3075 3076 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3077 ieee80211_ht_update_beacon(vap, bo); 3078 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3079 } 3080#ifdef IEEE80211_SUPPORT_TDMA 3081 if (vap->iv_caps & IEEE80211_C_TDMA) { 3082 /* 3083 * NB: the beacon is potentially updated every TBTT. 3084 */ 3085 ieee80211_tdma_update_beacon(vap, bo); 3086 } 3087#endif 3088#ifdef IEEE80211_SUPPORT_MESH 3089 if (vap->iv_opmode == IEEE80211_M_MBSS) 3090 ieee80211_mesh_update_beacon(vap, bo); 3091#endif 3092 3093 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3094 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3095 struct ieee80211_tim_ie *tie = 3096 (struct ieee80211_tim_ie *) bo->bo_tim; 3097 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3098 u_int timlen, timoff, i; 3099 /* 3100 * ATIM/DTIM needs updating. If it fits in the 3101 * current space allocated then just copy in the 3102 * new bits. Otherwise we need to move any trailing 3103 * data to make room. Note that we know there is 3104 * contiguous space because ieee80211_beacon_allocate 3105 * insures there is space in the mbuf to write a 3106 * maximal-size virtual bitmap (based on iv_max_aid). 3107 */ 3108 /* 3109 * Calculate the bitmap size and offset, copy any 3110 * trailer out of the way, and then copy in the 3111 * new bitmap and update the information element. 3112 * Note that the tim bitmap must contain at least 3113 * one byte and any offset must be even. 3114 */ 3115 if (vap->iv_ps_pending != 0) { 3116 timoff = 128; /* impossibly large */ 3117 for (i = 0; i < vap->iv_tim_len; i++) 3118 if (vap->iv_tim_bitmap[i]) { 3119 timoff = i &~ 1; 3120 break; 3121 } 3122 KASSERT(timoff != 128, ("tim bitmap empty!")); 3123 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3124 if (vap->iv_tim_bitmap[i]) 3125 break; 3126 timlen = 1 + (i - timoff); 3127 } else { 3128 timoff = 0; 3129 timlen = 1; 3130 } 3131 if (timlen != bo->bo_tim_len) { 3132 /* copy up/down trailer */ 3133 int adjust = tie->tim_bitmap+timlen 3134 - bo->bo_tim_trailer; 3135 ovbcopy(bo->bo_tim_trailer, 3136 bo->bo_tim_trailer+adjust, 3137 bo->bo_tim_trailer_len); 3138 bo->bo_tim_trailer += adjust; 3139 bo->bo_erp += adjust; 3140 bo->bo_htinfo += adjust; 3141#ifdef IEEE80211_SUPPORT_SUPERG 3142 bo->bo_ath += adjust; 3143#endif 3144#ifdef IEEE80211_SUPPORT_TDMA 3145 bo->bo_tdma += adjust; 3146#endif 3147#ifdef IEEE80211_SUPPORT_MESH 3148 bo->bo_meshconf += adjust; 3149#endif 3150 bo->bo_appie += adjust; 3151 bo->bo_wme += adjust; 3152 bo->bo_csa += adjust; 3153 bo->bo_quiet += adjust; 3154 bo->bo_tim_len = timlen; 3155 3156 /* update information element */ 3157 tie->tim_len = 3 + timlen; 3158 tie->tim_bitctl = timoff; 3159 len_changed = 1; 3160 } 3161 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3162 bo->bo_tim_len); 3163 3164 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3165 3166 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3167 "%s: TIM updated, pending %u, off %u, len %u\n", 3168 __func__, vap->iv_ps_pending, timoff, timlen); 3169 } 3170 /* count down DTIM period */ 3171 if (tie->tim_count == 0) 3172 tie->tim_count = tie->tim_period - 1; 3173 else 3174 tie->tim_count--; 3175 /* update state for buffered multicast frames on DTIM */ 3176 if (mcast && tie->tim_count == 0) 3177 tie->tim_bitctl |= 1; 3178 else 3179 tie->tim_bitctl &= ~1; 3180 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3181 struct ieee80211_csa_ie *csa = 3182 (struct ieee80211_csa_ie *) bo->bo_csa; 3183 3184 /* 3185 * Insert or update CSA ie. If we're just starting 3186 * to count down to the channel switch then we need 3187 * to insert the CSA ie. Otherwise we just need to 3188 * drop the count. The actual change happens above 3189 * when the vap's count reaches the target count. 3190 */ 3191 if (vap->iv_csa_count == 0) { 3192 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3193 bo->bo_erp += sizeof(*csa); 3194 bo->bo_htinfo += sizeof(*csa); 3195 bo->bo_wme += sizeof(*csa); 3196#ifdef IEEE80211_SUPPORT_SUPERG 3197 bo->bo_ath += sizeof(*csa); 3198#endif 3199#ifdef IEEE80211_SUPPORT_TDMA 3200 bo->bo_tdma += sizeof(*csa); 3201#endif 3202#ifdef IEEE80211_SUPPORT_MESH 3203 bo->bo_meshconf += sizeof(*csa); 3204#endif 3205 bo->bo_appie += sizeof(*csa); 3206 bo->bo_csa_trailer_len += sizeof(*csa); 3207 bo->bo_quiet += sizeof(*csa); 3208 bo->bo_tim_trailer_len += sizeof(*csa); 3209 m->m_len += sizeof(*csa); 3210 m->m_pkthdr.len += sizeof(*csa); 3211 3212 ieee80211_add_csa(bo->bo_csa, vap); 3213 } else 3214 csa->csa_count--; 3215 vap->iv_csa_count++; 3216 /* NB: don't clear IEEE80211_BEACON_CSA */ 3217 } 3218 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3219 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3220 if (vap->iv_quiet) 3221 ieee80211_add_quiet(bo->bo_quiet, vap); 3222 } 3223 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3224 /* 3225 * ERP element needs updating. 3226 */ 3227 (void) ieee80211_add_erp(bo->bo_erp, ic); 3228 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3229 } 3230#ifdef IEEE80211_SUPPORT_SUPERG 3231 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3232 ieee80211_add_athcaps(bo->bo_ath, ni); 3233 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3234 } 3235#endif 3236 } 3237 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3238 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3239 int aielen; 3240 uint8_t *frm; 3241 3242 aielen = 0; 3243 if (aie != NULL) 3244 aielen += aie->ie_len; 3245 if (aielen != bo->bo_appie_len) { 3246 /* copy up/down trailer */ 3247 int adjust = aielen - bo->bo_appie_len; 3248 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3249 bo->bo_tim_trailer_len); 3250 bo->bo_tim_trailer += adjust; 3251 bo->bo_appie += adjust; 3252 bo->bo_appie_len = aielen; 3253 3254 len_changed = 1; 3255 } 3256 frm = bo->bo_appie; 3257 if (aie != NULL) 3258 frm = add_appie(frm, aie); 3259 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3260 } 3261 IEEE80211_UNLOCK(ic); 3262 3263 return len_changed; 3264} 3265