ieee80211_output.c revision 221022
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 221022 2011-04-25 16:37:47Z bz $"); 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 * Start method for vap's. All packets from the stack come 114 * through here. We handle common processing of the packets 115 * before dispatching them to the underlying device. 116 */ 117void 118ieee80211_start(struct ifnet *ifp) 119{ 120#define IS_DWDS(vap) \ 121 (vap->iv_opmode == IEEE80211_M_WDS && \ 122 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 123 struct ieee80211vap *vap = ifp->if_softc; 124 struct ieee80211com *ic = vap->iv_ic; 125 struct ifnet *parent = ic->ic_ifp; 126 struct ieee80211_node *ni; 127 struct mbuf *m; 128 struct ether_header *eh; 129 int error; 130 131 /* NB: parent must be up and running */ 132 if (!IFNET_IS_UP_RUNNING(parent)) { 133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 134 "%s: ignore queue, parent %s not up+running\n", 135 __func__, parent->if_xname); 136 /* XXX stat */ 137 return; 138 } 139 if (vap->iv_state == IEEE80211_S_SLEEP) { 140 /* 141 * In power save, wakeup device for transmit. 142 */ 143 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 144 return; 145 } 146 /* 147 * No data frames go out unless we're running. 148 * Note in particular this covers CAC and CSA 149 * states (though maybe we should check muting 150 * for CSA). 151 */ 152 if (vap->iv_state != IEEE80211_S_RUN) { 153 IEEE80211_LOCK(ic); 154 /* re-check under the com lock to avoid races */ 155 if (vap->iv_state != IEEE80211_S_RUN) { 156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 157 "%s: ignore queue, in %s state\n", 158 __func__, ieee80211_state_name[vap->iv_state]); 159 vap->iv_stats.is_tx_badstate++; 160 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 161 IEEE80211_UNLOCK(ic); 162 return; 163 } 164 IEEE80211_UNLOCK(ic); 165 } 166 for (;;) { 167 IFQ_DEQUEUE(&ifp->if_snd, m); 168 if (m == NULL) 169 break; 170 /* 171 * Sanitize mbuf flags for net80211 use. We cannot 172 * clear M_PWR_SAV or M_MORE_DATA because these may 173 * be set for frames that are re-submitted from the 174 * power save queue. 175 * 176 * NB: This must be done before ieee80211_classify as 177 * it marks EAPOL in frames with M_EAPOL. 178 */ 179 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 180 /* 181 * Cancel any background scan. 182 */ 183 if (ic->ic_flags & IEEE80211_F_SCAN) 184 ieee80211_cancel_anyscan(vap); 185 /* 186 * Find the node for the destination so we can do 187 * things like power save and fast frames aggregation. 188 * 189 * NB: past this point various code assumes the first 190 * mbuf has the 802.3 header present (and contiguous). 191 */ 192 ni = NULL; 193 if (m->m_len < sizeof(struct ether_header) && 194 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 195 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 196 "discard frame, %s\n", "m_pullup failed"); 197 vap->iv_stats.is_tx_nobuf++; /* XXX */ 198 ifp->if_oerrors++; 199 continue; 200 } 201 eh = mtod(m, struct ether_header *); 202 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 203 if (IS_DWDS(vap)) { 204 /* 205 * Only unicast frames from the above go out 206 * DWDS vaps; multicast frames are handled by 207 * dispatching the frame as it comes through 208 * the AP vap (see below). 209 */ 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 211 eh->ether_dhost, "mcast", "%s", "on DWDS"); 212 vap->iv_stats.is_dwds_mcast++; 213 m_freem(m); 214 continue; 215 } 216 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 217 /* 218 * Spam DWDS vap's w/ multicast traffic. 219 */ 220 /* XXX only if dwds in use? */ 221 ieee80211_dwds_mcast(vap, m); 222 } 223 } 224#ifdef IEEE80211_SUPPORT_MESH 225 if (vap->iv_opmode != IEEE80211_M_MBSS) { 226#endif 227 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 228 if (ni == NULL) { 229 /* NB: ieee80211_find_txnode does stat+msg */ 230 ifp->if_oerrors++; 231 m_freem(m); 232 continue; 233 } 234 if (ni->ni_associd == 0 && 235 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 236 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 237 eh->ether_dhost, NULL, 238 "sta not associated (type 0x%04x)", 239 htons(eh->ether_type)); 240 vap->iv_stats.is_tx_notassoc++; 241 ifp->if_oerrors++; 242 m_freem(m); 243 ieee80211_free_node(ni); 244 continue; 245 } 246#ifdef IEEE80211_SUPPORT_MESH 247 } else { 248 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 249 /* 250 * Proxy station only if configured. 251 */ 252 if (!ieee80211_mesh_isproxyena(vap)) { 253 IEEE80211_DISCARD_MAC(vap, 254 IEEE80211_MSG_OUTPUT | 255 IEEE80211_MSG_MESH, 256 eh->ether_dhost, NULL, 257 "%s", "proxy not enabled"); 258 vap->iv_stats.is_mesh_notproxy++; 259 ifp->if_oerrors++; 260 m_freem(m); 261 continue; 262 } 263 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 264 } 265 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 266 if (ni == NULL) { 267 /* 268 * NB: ieee80211_mesh_discover holds/disposes 269 * frame (e.g. queueing on path discovery). 270 */ 271 ifp->if_oerrors++; 272 continue; 273 } 274 } 275#endif 276 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 277 (m->m_flags & M_PWR_SAV) == 0) { 278 /* 279 * Station in power save mode; pass the frame 280 * to the 802.11 layer and continue. We'll get 281 * the frame back when the time is right. 282 * XXX lose WDS vap linkage? 283 */ 284 (void) ieee80211_pwrsave(ni, m); 285 ieee80211_free_node(ni); 286 continue; 287 } 288 /* calculate priority so drivers can find the tx queue */ 289 if (ieee80211_classify(ni, m)) { 290 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 291 eh->ether_dhost, NULL, 292 "%s", "classification failure"); 293 vap->iv_stats.is_tx_classify++; 294 ifp->if_oerrors++; 295 m_freem(m); 296 ieee80211_free_node(ni); 297 continue; 298 } 299 /* 300 * Stash the node pointer. Note that we do this after 301 * any call to ieee80211_dwds_mcast because that code 302 * uses any existing value for rcvif to identify the 303 * interface it (might have been) received on. 304 */ 305 m->m_pkthdr.rcvif = (void *)ni; 306 307 BPF_MTAP(ifp, m); /* 802.3 tx */ 308 309 /* 310 * Check if A-MPDU tx aggregation is setup or if we 311 * should try to enable it. The sta must be associated 312 * with HT and A-MPDU enabled for use. When the policy 313 * routine decides we should enable A-MPDU we issue an 314 * ADDBA request and wait for a reply. The frame being 315 * encapsulated will go out w/o using A-MPDU, or possibly 316 * it might be collected by the driver and held/retransmit. 317 * The default ic_ampdu_enable routine handles staggering 318 * ADDBA requests in case the receiver NAK's us or we are 319 * otherwise unable to establish a BA stream. 320 */ 321 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 322 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 323 (m->m_flags & M_EAPOL) == 0) { 324 const int ac = M_WME_GETAC(m); 325 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 326 327 ieee80211_txampdu_count_packet(tap); 328 if (IEEE80211_AMPDU_RUNNING(tap)) { 329 /* 330 * Operational, mark frame for aggregation. 331 * 332 * XXX do tx aggregation here 333 */ 334 m->m_flags |= M_AMPDU_MPDU; 335 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 336 ic->ic_ampdu_enable(ni, tap)) { 337 /* 338 * Not negotiated yet, request service. 339 */ 340 ieee80211_ampdu_request(ni, tap); 341 /* XXX hold frame for reply? */ 342 } 343 } 344#ifdef IEEE80211_SUPPORT_SUPERG 345 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 346 m = ieee80211_ff_check(ni, m); 347 if (m == NULL) { 348 /* NB: any ni ref held on stageq */ 349 continue; 350 } 351 } 352#endif /* IEEE80211_SUPPORT_SUPERG */ 353 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 354 /* 355 * Encapsulate the packet in prep for transmission. 356 */ 357 m = ieee80211_encap(vap, ni, m); 358 if (m == NULL) { 359 /* NB: stat+msg handled in ieee80211_encap */ 360 ieee80211_free_node(ni); 361 continue; 362 } 363 } 364 365 error = parent->if_transmit(parent, m); 366 if (error != 0) { 367 /* NB: IFQ_HANDOFF reclaims mbuf */ 368 ieee80211_free_node(ni); 369 } else { 370 ifp->if_opackets++; 371 } 372 ic->ic_lastdata = ticks; 373 } 374#undef IS_DWDS 375} 376 377/* 378 * 802.11 output routine. This is (currently) used only to 379 * connect bpf write calls to the 802.11 layer for injecting 380 * raw 802.11 frames. 381 */ 382int 383ieee80211_output(struct ifnet *ifp, struct mbuf *m, 384 struct sockaddr *dst, struct route *ro) 385{ 386#define senderr(e) do { error = (e); goto bad;} while (0) 387 struct ieee80211_node *ni = NULL; 388 struct ieee80211vap *vap; 389 struct ieee80211_frame *wh; 390 int error; 391 392 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 393 /* 394 * Short-circuit requests if the vap is marked OACTIVE 395 * as this can happen because a packet came down through 396 * ieee80211_start before the vap entered RUN state in 397 * which case it's ok to just drop the frame. This 398 * should not be necessary but callers of if_output don't 399 * check OACTIVE. 400 */ 401 senderr(ENETDOWN); 402 } 403 vap = ifp->if_softc; 404 /* 405 * Hand to the 802.3 code if not tagged as 406 * a raw 802.11 frame. 407 */ 408 if (dst->sa_family != AF_IEEE80211) 409 return vap->iv_output(ifp, m, dst, ro); 410#ifdef MAC 411 error = mac_ifnet_check_transmit(ifp, m); 412 if (error) 413 senderr(error); 414#endif 415 if (ifp->if_flags & IFF_MONITOR) 416 senderr(ENETDOWN); 417 if (!IFNET_IS_UP_RUNNING(ifp)) 418 senderr(ENETDOWN); 419 if (vap->iv_state == IEEE80211_S_CAC) { 420 IEEE80211_DPRINTF(vap, 421 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 422 "block %s frame in CAC state\n", "raw data"); 423 vap->iv_stats.is_tx_badstate++; 424 senderr(EIO); /* XXX */ 425 } else if (vap->iv_state == IEEE80211_S_SCAN) 426 senderr(EIO); 427 /* XXX bypass bridge, pfil, carp, etc. */ 428 429 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 430 senderr(EIO); /* XXX */ 431 wh = mtod(m, struct ieee80211_frame *); 432 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 433 IEEE80211_FC0_VERSION_0) 434 senderr(EIO); /* XXX */ 435 436 /* locate destination node */ 437 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 438 case IEEE80211_FC1_DIR_NODS: 439 case IEEE80211_FC1_DIR_FROMDS: 440 ni = ieee80211_find_txnode(vap, wh->i_addr1); 441 break; 442 case IEEE80211_FC1_DIR_TODS: 443 case IEEE80211_FC1_DIR_DSTODS: 444 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 445 senderr(EIO); /* XXX */ 446 ni = ieee80211_find_txnode(vap, wh->i_addr3); 447 break; 448 default: 449 senderr(EIO); /* XXX */ 450 } 451 if (ni == NULL) { 452 /* 453 * Permit packets w/ bpf params through regardless 454 * (see below about sa_len). 455 */ 456 if (dst->sa_len == 0) 457 senderr(EHOSTUNREACH); 458 ni = ieee80211_ref_node(vap->iv_bss); 459 } 460 461 /* 462 * Sanitize mbuf for net80211 flags leaked from above. 463 * 464 * NB: This must be done before ieee80211_classify as 465 * it marks EAPOL in frames with M_EAPOL. 466 */ 467 m->m_flags &= ~M_80211_TX; 468 469 /* calculate priority so drivers can find the tx queue */ 470 /* XXX assumes an 802.3 frame */ 471 if (ieee80211_classify(ni, m)) 472 senderr(EIO); /* XXX */ 473 474 ifp->if_opackets++; 475 IEEE80211_NODE_STAT(ni, tx_data); 476 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 477 IEEE80211_NODE_STAT(ni, tx_mcast); 478 m->m_flags |= M_MCAST; 479 } else 480 IEEE80211_NODE_STAT(ni, tx_ucast); 481 /* NB: ieee80211_encap does not include 802.11 header */ 482 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 483 484 /* 485 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 486 * present by setting the sa_len field of the sockaddr (yes, 487 * this is a hack). 488 * NB: we assume sa_data is suitably aligned to cast. 489 */ 490 return vap->iv_ic->ic_raw_xmit(ni, m, 491 (const struct ieee80211_bpf_params *)(dst->sa_len ? 492 dst->sa_data : NULL)); 493bad: 494 if (m != NULL) 495 m_freem(m); 496 if (ni != NULL) 497 ieee80211_free_node(ni); 498 ifp->if_oerrors++; 499 return error; 500#undef senderr 501} 502 503/* 504 * Set the direction field and address fields of an outgoing 505 * frame. Note this should be called early on in constructing 506 * a frame as it sets i_fc[1]; other bits can then be or'd in. 507 */ 508void 509ieee80211_send_setup( 510 struct ieee80211_node *ni, 511 struct mbuf *m, 512 int type, int tid, 513 const uint8_t sa[IEEE80211_ADDR_LEN], 514 const uint8_t da[IEEE80211_ADDR_LEN], 515 const uint8_t bssid[IEEE80211_ADDR_LEN]) 516{ 517#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 518 struct ieee80211vap *vap = ni->ni_vap; 519 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 520 ieee80211_seq seqno; 521 522 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 523 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 524 switch (vap->iv_opmode) { 525 case IEEE80211_M_STA: 526 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 527 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 528 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 529 IEEE80211_ADDR_COPY(wh->i_addr3, da); 530 break; 531 case IEEE80211_M_IBSS: 532 case IEEE80211_M_AHDEMO: 533 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 534 IEEE80211_ADDR_COPY(wh->i_addr1, da); 535 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 536 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 537 break; 538 case IEEE80211_M_HOSTAP: 539 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 540 IEEE80211_ADDR_COPY(wh->i_addr1, da); 541 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 542 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 543 break; 544 case IEEE80211_M_WDS: 545 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 546 IEEE80211_ADDR_COPY(wh->i_addr1, da); 547 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 548 IEEE80211_ADDR_COPY(wh->i_addr3, da); 549 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 550 break; 551 case IEEE80211_M_MBSS: 552#ifdef IEEE80211_SUPPORT_MESH 553 /* XXX add support for proxied addresses */ 554 if (IEEE80211_IS_MULTICAST(da)) { 555 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 556 /* XXX next hop */ 557 IEEE80211_ADDR_COPY(wh->i_addr1, da); 558 IEEE80211_ADDR_COPY(wh->i_addr2, 559 vap->iv_myaddr); 560 } else { 561 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 562 IEEE80211_ADDR_COPY(wh->i_addr1, da); 563 IEEE80211_ADDR_COPY(wh->i_addr2, 564 vap->iv_myaddr); 565 IEEE80211_ADDR_COPY(wh->i_addr3, da); 566 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 567 } 568#endif 569 break; 570 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 571 break; 572 } 573 } else { 574 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 575 IEEE80211_ADDR_COPY(wh->i_addr1, da); 576 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 577#ifdef IEEE80211_SUPPORT_MESH 578 if (vap->iv_opmode == IEEE80211_M_MBSS) 579 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 580 else 581#endif 582 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 583 } 584 *(uint16_t *)&wh->i_dur[0] = 0; 585 586 seqno = ni->ni_txseqs[tid]++; 587 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 588 M_SEQNO_SET(m, seqno); 589 590 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 591 m->m_flags |= M_MCAST; 592#undef WH4 593} 594 595/* 596 * Send a management frame to the specified node. The node pointer 597 * must have a reference as the pointer will be passed to the driver 598 * and potentially held for a long time. If the frame is successfully 599 * dispatched to the driver, then it is responsible for freeing the 600 * reference (and potentially free'ing up any associated storage); 601 * otherwise deal with reclaiming any reference (on error). 602 */ 603int 604ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 605 struct ieee80211_bpf_params *params) 606{ 607 struct ieee80211vap *vap = ni->ni_vap; 608 struct ieee80211com *ic = ni->ni_ic; 609 struct ieee80211_frame *wh; 610 611 KASSERT(ni != NULL, ("null node")); 612 613 if (vap->iv_state == IEEE80211_S_CAC) { 614 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 615 ni, "block %s frame in CAC state", 616 ieee80211_mgt_subtype_name[ 617 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 618 IEEE80211_FC0_SUBTYPE_SHIFT]); 619 vap->iv_stats.is_tx_badstate++; 620 ieee80211_free_node(ni); 621 m_freem(m); 622 return EIO; /* XXX */ 623 } 624 625 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 626 if (m == NULL) { 627 ieee80211_free_node(ni); 628 return ENOMEM; 629 } 630 631 wh = mtod(m, struct ieee80211_frame *); 632 ieee80211_send_setup(ni, m, 633 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 634 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 635 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 636 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 637 "encrypting frame (%s)", __func__); 638 wh->i_fc[1] |= IEEE80211_FC1_WEP; 639 } 640 m->m_flags |= M_ENCAP; /* mark encapsulated */ 641 642 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 643 M_WME_SETAC(m, params->ibp_pri); 644 645#ifdef IEEE80211_DEBUG 646 /* avoid printing too many frames */ 647 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 648 ieee80211_msg_dumppkts(vap)) { 649 printf("[%s] send %s on channel %u\n", 650 ether_sprintf(wh->i_addr1), 651 ieee80211_mgt_subtype_name[ 652 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 653 IEEE80211_FC0_SUBTYPE_SHIFT], 654 ieee80211_chan2ieee(ic, ic->ic_curchan)); 655 } 656#endif 657 IEEE80211_NODE_STAT(ni, tx_mgmt); 658 659 return ic->ic_raw_xmit(ni, m, params); 660} 661 662/* 663 * Send a null data frame to the specified node. If the station 664 * is setup for QoS then a QoS Null Data frame is constructed. 665 * If this is a WDS station then a 4-address frame is constructed. 666 * 667 * NB: the caller is assumed to have setup a node reference 668 * for use; this is necessary to deal with a race condition 669 * when probing for inactive stations. Like ieee80211_mgmt_output 670 * we must cleanup any node reference on error; however we 671 * can safely just unref it as we know it will never be the 672 * last reference to the node. 673 */ 674int 675ieee80211_send_nulldata(struct ieee80211_node *ni) 676{ 677 struct ieee80211vap *vap = ni->ni_vap; 678 struct ieee80211com *ic = ni->ni_ic; 679 struct mbuf *m; 680 struct ieee80211_frame *wh; 681 int hdrlen; 682 uint8_t *frm; 683 684 if (vap->iv_state == IEEE80211_S_CAC) { 685 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 686 ni, "block %s frame in CAC state", "null data"); 687 ieee80211_unref_node(&ni); 688 vap->iv_stats.is_tx_badstate++; 689 return EIO; /* XXX */ 690 } 691 692 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 693 hdrlen = sizeof(struct ieee80211_qosframe); 694 else 695 hdrlen = sizeof(struct ieee80211_frame); 696 /* NB: only WDS vap's get 4-address frames */ 697 if (vap->iv_opmode == IEEE80211_M_WDS) 698 hdrlen += IEEE80211_ADDR_LEN; 699 if (ic->ic_flags & IEEE80211_F_DATAPAD) 700 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 701 702 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 703 if (m == NULL) { 704 /* XXX debug msg */ 705 ieee80211_unref_node(&ni); 706 vap->iv_stats.is_tx_nobuf++; 707 return ENOMEM; 708 } 709 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 710 ("leading space %zd", M_LEADINGSPACE(m))); 711 M_PREPEND(m, hdrlen, M_DONTWAIT); 712 if (m == NULL) { 713 /* NB: cannot happen */ 714 ieee80211_free_node(ni); 715 return ENOMEM; 716 } 717 718 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 719 if (ni->ni_flags & IEEE80211_NODE_QOS) { 720 const int tid = WME_AC_TO_TID(WME_AC_BE); 721 uint8_t *qos; 722 723 ieee80211_send_setup(ni, m, 724 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 725 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 726 727 if (vap->iv_opmode == IEEE80211_M_WDS) 728 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 729 else 730 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 731 qos[0] = tid & IEEE80211_QOS_TID; 732 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 733 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 734 qos[1] = 0; 735 } else { 736 ieee80211_send_setup(ni, m, 737 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 738 IEEE80211_NONQOS_TID, 739 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 740 } 741 if (vap->iv_opmode != IEEE80211_M_WDS) { 742 /* NB: power management bit is never sent by an AP */ 743 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 744 vap->iv_opmode != IEEE80211_M_HOSTAP) 745 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 746 } 747 m->m_len = m->m_pkthdr.len = hdrlen; 748 m->m_flags |= M_ENCAP; /* mark encapsulated */ 749 750 M_WME_SETAC(m, WME_AC_BE); 751 752 IEEE80211_NODE_STAT(ni, tx_data); 753 754 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 755 "send %snull data frame on channel %u, pwr mgt %s", 756 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 757 ieee80211_chan2ieee(ic, ic->ic_curchan), 758 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 759 760 return ic->ic_raw_xmit(ni, m, NULL); 761} 762 763/* 764 * Assign priority to a frame based on any vlan tag assigned 765 * to the station and/or any Diffserv setting in an IP header. 766 * Finally, if an ACM policy is setup (in station mode) it's 767 * applied. 768 */ 769int 770ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 771{ 772 const struct ether_header *eh = mtod(m, struct ether_header *); 773 int v_wme_ac, d_wme_ac, ac; 774 775 /* 776 * Always promote PAE/EAPOL frames to high priority. 777 */ 778 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 779 /* NB: mark so others don't need to check header */ 780 m->m_flags |= M_EAPOL; 781 ac = WME_AC_VO; 782 goto done; 783 } 784 /* 785 * Non-qos traffic goes to BE. 786 */ 787 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 788 ac = WME_AC_BE; 789 goto done; 790 } 791 792 /* 793 * If node has a vlan tag then all traffic 794 * to it must have a matching tag. 795 */ 796 v_wme_ac = 0; 797 if (ni->ni_vlan != 0) { 798 if ((m->m_flags & M_VLANTAG) == 0) { 799 IEEE80211_NODE_STAT(ni, tx_novlantag); 800 return 1; 801 } 802 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 803 EVL_VLANOFTAG(ni->ni_vlan)) { 804 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 805 return 1; 806 } 807 /* map vlan priority to AC */ 808 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 809 } 810 811 /* XXX m_copydata may be too slow for fast path */ 812#ifdef INET 813 if (eh->ether_type == htons(ETHERTYPE_IP)) { 814 uint8_t tos; 815 /* 816 * IP frame, map the DSCP bits from the TOS field. 817 */ 818 /* NB: ip header may not be in first mbuf */ 819 m_copydata(m, sizeof(struct ether_header) + 820 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 821 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 822 d_wme_ac = TID_TO_WME_AC(tos); 823 } else { 824#endif /* INET */ 825#ifdef INET6 826 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 827 uint32_t flow; 828 uint8_t tos; 829 /* 830 * IPv6 frame, map the DSCP bits from the TOS field. 831 */ 832 m_copydata(m, sizeof(struct ether_header) + 833 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 834 (caddr_t) &flow); 835 tos = (uint8_t)(ntohl(flow) >> 20); 836 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 837 d_wme_ac = TID_TO_WME_AC(tos); 838 } else { 839#endif /* INET6 */ 840 d_wme_ac = WME_AC_BE; 841#ifdef INET6 842 } 843#endif 844#ifdef INET 845 } 846#endif 847 /* 848 * Use highest priority AC. 849 */ 850 if (v_wme_ac > d_wme_ac) 851 ac = v_wme_ac; 852 else 853 ac = d_wme_ac; 854 855 /* 856 * Apply ACM policy. 857 */ 858 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 859 static const int acmap[4] = { 860 WME_AC_BK, /* WME_AC_BE */ 861 WME_AC_BK, /* WME_AC_BK */ 862 WME_AC_BE, /* WME_AC_VI */ 863 WME_AC_VI, /* WME_AC_VO */ 864 }; 865 struct ieee80211com *ic = ni->ni_ic; 866 867 while (ac != WME_AC_BK && 868 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 869 ac = acmap[ac]; 870 } 871done: 872 M_WME_SETAC(m, ac); 873 return 0; 874} 875 876/* 877 * Insure there is sufficient contiguous space to encapsulate the 878 * 802.11 data frame. If room isn't already there, arrange for it. 879 * Drivers and cipher modules assume we have done the necessary work 880 * and fail rudely if they don't find the space they need. 881 */ 882struct mbuf * 883ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 884 struct ieee80211_key *key, struct mbuf *m) 885{ 886#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 887 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 888 889 if (key != NULL) { 890 /* XXX belongs in crypto code? */ 891 needed_space += key->wk_cipher->ic_header; 892 /* XXX frags */ 893 /* 894 * When crypto is being done in the host we must insure 895 * the data are writable for the cipher routines; clone 896 * a writable mbuf chain. 897 * XXX handle SWMIC specially 898 */ 899 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 900 m = m_unshare(m, M_NOWAIT); 901 if (m == NULL) { 902 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 903 "%s: cannot get writable mbuf\n", __func__); 904 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 905 return NULL; 906 } 907 } 908 } 909 /* 910 * We know we are called just before stripping an Ethernet 911 * header and prepending an LLC header. This means we know 912 * there will be 913 * sizeof(struct ether_header) - sizeof(struct llc) 914 * bytes recovered to which we need additional space for the 915 * 802.11 header and any crypto header. 916 */ 917 /* XXX check trailing space and copy instead? */ 918 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 919 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 920 if (n == NULL) { 921 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 922 "%s: cannot expand storage\n", __func__); 923 vap->iv_stats.is_tx_nobuf++; 924 m_freem(m); 925 return NULL; 926 } 927 KASSERT(needed_space <= MHLEN, 928 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 929 /* 930 * Setup new mbuf to have leading space to prepend the 931 * 802.11 header and any crypto header bits that are 932 * required (the latter are added when the driver calls 933 * back to ieee80211_crypto_encap to do crypto encapsulation). 934 */ 935 /* NB: must be first 'cuz it clobbers m_data */ 936 m_move_pkthdr(n, m); 937 n->m_len = 0; /* NB: m_gethdr does not set */ 938 n->m_data += needed_space; 939 /* 940 * Pull up Ethernet header to create the expected layout. 941 * We could use m_pullup but that's overkill (i.e. we don't 942 * need the actual data) and it cannot fail so do it inline 943 * for speed. 944 */ 945 /* NB: struct ether_header is known to be contiguous */ 946 n->m_len += sizeof(struct ether_header); 947 m->m_len -= sizeof(struct ether_header); 948 m->m_data += sizeof(struct ether_header); 949 /* 950 * Replace the head of the chain. 951 */ 952 n->m_next = m; 953 m = n; 954 } 955 return m; 956#undef TO_BE_RECLAIMED 957} 958 959/* 960 * Return the transmit key to use in sending a unicast frame. 961 * If a unicast key is set we use that. When no unicast key is set 962 * we fall back to the default transmit key. 963 */ 964static __inline struct ieee80211_key * 965ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 966 struct ieee80211_node *ni) 967{ 968 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 969 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 970 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 971 return NULL; 972 return &vap->iv_nw_keys[vap->iv_def_txkey]; 973 } else { 974 return &ni->ni_ucastkey; 975 } 976} 977 978/* 979 * Return the transmit key to use in sending a multicast frame. 980 * Multicast traffic always uses the group key which is installed as 981 * the default tx key. 982 */ 983static __inline struct ieee80211_key * 984ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 985 struct ieee80211_node *ni) 986{ 987 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 988 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 989 return NULL; 990 return &vap->iv_nw_keys[vap->iv_def_txkey]; 991} 992 993/* 994 * Encapsulate an outbound data frame. The mbuf chain is updated. 995 * If an error is encountered NULL is returned. The caller is required 996 * to provide a node reference and pullup the ethernet header in the 997 * first mbuf. 998 * 999 * NB: Packet is assumed to be processed by ieee80211_classify which 1000 * marked EAPOL frames w/ M_EAPOL. 1001 */ 1002struct mbuf * 1003ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1004 struct mbuf *m) 1005{ 1006#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1007 struct ieee80211com *ic = ni->ni_ic; 1008#ifdef IEEE80211_SUPPORT_MESH 1009 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1010 struct ieee80211_meshcntl_ae10 *mc; 1011#endif 1012 struct ether_header eh; 1013 struct ieee80211_frame *wh; 1014 struct ieee80211_key *key; 1015 struct llc *llc; 1016 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1017 ieee80211_seq seqno; 1018 int meshhdrsize, meshae; 1019 uint8_t *qos; 1020 1021 /* 1022 * Copy existing Ethernet header to a safe place. The 1023 * rest of the code assumes it's ok to strip it when 1024 * reorganizing state for the final encapsulation. 1025 */ 1026 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1027 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1028 1029 /* 1030 * Insure space for additional headers. First identify 1031 * transmit key to use in calculating any buffer adjustments 1032 * required. This is also used below to do privacy 1033 * encapsulation work. Then calculate the 802.11 header 1034 * size and any padding required by the driver. 1035 * 1036 * Note key may be NULL if we fall back to the default 1037 * transmit key and that is not set. In that case the 1038 * buffer may not be expanded as needed by the cipher 1039 * routines, but they will/should discard it. 1040 */ 1041 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1042 if (vap->iv_opmode == IEEE80211_M_STA || 1043 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1044 (vap->iv_opmode == IEEE80211_M_WDS && 1045 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1046 key = ieee80211_crypto_getucastkey(vap, ni); 1047 else 1048 key = ieee80211_crypto_getmcastkey(vap, ni); 1049 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1050 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1051 eh.ether_dhost, 1052 "no default transmit key (%s) deftxkey %u", 1053 __func__, vap->iv_def_txkey); 1054 vap->iv_stats.is_tx_nodefkey++; 1055 goto bad; 1056 } 1057 } else 1058 key = NULL; 1059 /* 1060 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1061 * frames so suppress use. This may be an issue if other 1062 * ap's require all data frames to be QoS-encapsulated 1063 * once negotiated in which case we'll need to make this 1064 * configurable. 1065 */ 1066 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1067 (m->m_flags & M_EAPOL) == 0; 1068 if (addqos) 1069 hdrsize = sizeof(struct ieee80211_qosframe); 1070 else 1071 hdrsize = sizeof(struct ieee80211_frame); 1072#ifdef IEEE80211_SUPPORT_MESH 1073 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1074 /* 1075 * Mesh data frames are encapsulated according to the 1076 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1077 * o Group Addressed data (aka multicast) originating 1078 * at the local sta are sent w/ 3-address format and 1079 * address extension mode 00 1080 * o Individually Addressed data (aka unicast) originating 1081 * at the local sta are sent w/ 4-address format and 1082 * address extension mode 00 1083 * o Group Addressed data forwarded from a non-mesh sta are 1084 * sent w/ 3-address format and address extension mode 01 1085 * o Individually Address data from another sta are sent 1086 * w/ 4-address format and address extension mode 10 1087 */ 1088 is4addr = 0; /* NB: don't use, disable */ 1089 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1090 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1091 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1092 /* XXX defines for AE modes */ 1093 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1094 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1095 meshae = 0; 1096 else 1097 meshae = 4; /* NB: pseudo */ 1098 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1099 meshae = 1; 1100 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1101 } else { 1102 meshae = 2; 1103 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1104 } 1105 } else { 1106#endif 1107 /* 1108 * 4-address frames need to be generated for: 1109 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1110 * o packets sent through a vap marked for relaying 1111 * (e.g. a station operating with dynamic WDS) 1112 */ 1113 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1114 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1115 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1116 if (is4addr) 1117 hdrsize += IEEE80211_ADDR_LEN; 1118 meshhdrsize = meshae = 0; 1119#ifdef IEEE80211_SUPPORT_MESH 1120 } 1121#endif 1122 /* 1123 * Honor driver DATAPAD requirement. 1124 */ 1125 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1126 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1127 else 1128 hdrspace = hdrsize; 1129 1130 if (__predict_true((m->m_flags & M_FF) == 0)) { 1131 /* 1132 * Normal frame. 1133 */ 1134 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1135 if (m == NULL) { 1136 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1137 goto bad; 1138 } 1139 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1140 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1141 llc = mtod(m, struct llc *); 1142 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1143 llc->llc_control = LLC_UI; 1144 llc->llc_snap.org_code[0] = 0; 1145 llc->llc_snap.org_code[1] = 0; 1146 llc->llc_snap.org_code[2] = 0; 1147 llc->llc_snap.ether_type = eh.ether_type; 1148 } else { 1149#ifdef IEEE80211_SUPPORT_SUPERG 1150 /* 1151 * Aggregated frame. 1152 */ 1153 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1154 if (m == NULL) 1155#endif 1156 goto bad; 1157 } 1158 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1159 1160 M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT); 1161 if (m == NULL) { 1162 vap->iv_stats.is_tx_nobuf++; 1163 goto bad; 1164 } 1165 wh = mtod(m, struct ieee80211_frame *); 1166 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1167 *(uint16_t *)wh->i_dur = 0; 1168 qos = NULL; /* NB: quiet compiler */ 1169 if (is4addr) { 1170 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1171 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1172 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1173 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1174 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1175 } else switch (vap->iv_opmode) { 1176 case IEEE80211_M_STA: 1177 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1178 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1179 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1180 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1181 break; 1182 case IEEE80211_M_IBSS: 1183 case IEEE80211_M_AHDEMO: 1184 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1185 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1186 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1187 /* 1188 * NB: always use the bssid from iv_bss as the 1189 * neighbor's may be stale after an ibss merge 1190 */ 1191 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1192 break; 1193 case IEEE80211_M_HOSTAP: 1194 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1195 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1196 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1197 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1198 break; 1199#ifdef IEEE80211_SUPPORT_MESH 1200 case IEEE80211_M_MBSS: 1201 /* NB: offset by hdrspace to deal with DATAPAD */ 1202 mc = (struct ieee80211_meshcntl_ae10 *) 1203 (mtod(m, uint8_t *) + hdrspace); 1204 switch (meshae) { 1205 case 0: /* ucast, no proxy */ 1206 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1207 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1208 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1209 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1210 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1211 mc->mc_flags = 0; 1212 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1213 break; 1214 case 4: /* mcast, no proxy */ 1215 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1216 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1217 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1218 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1219 mc->mc_flags = 0; /* NB: AE is really 0 */ 1220 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1221 break; 1222 case 1: /* mcast, proxy */ 1223 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1224 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1225 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1226 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1227 mc->mc_flags = 1; 1228 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1229 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1230 break; 1231 case 2: /* ucast, proxy */ 1232 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1233 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1234 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1235 /* XXX not right, need MeshDA */ 1236 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1237 /* XXX assume are MeshSA */ 1238 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1239 mc->mc_flags = 2; 1240 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1241 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1242 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1243 break; 1244 default: 1245 KASSERT(0, ("meshae %d", meshae)); 1246 break; 1247 } 1248 mc->mc_ttl = ms->ms_ttl; 1249 ms->ms_seq++; 1250 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1251 break; 1252#endif 1253 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1254 default: 1255 goto bad; 1256 } 1257 if (m->m_flags & M_MORE_DATA) 1258 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1259 if (addqos) { 1260 int ac, tid; 1261 1262 if (is4addr) { 1263 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1264 /* NB: mesh case handled earlier */ 1265 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1266 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1267 ac = M_WME_GETAC(m); 1268 /* map from access class/queue to 11e header priorty value */ 1269 tid = WME_AC_TO_TID(ac); 1270 qos[0] = tid & IEEE80211_QOS_TID; 1271 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1272 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1273 qos[1] = 0; 1274 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1275 1276 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1277 /* 1278 * NB: don't assign a sequence # to potential 1279 * aggregates; we expect this happens at the 1280 * point the frame comes off any aggregation q 1281 * as otherwise we may introduce holes in the 1282 * BA sequence space and/or make window accouting 1283 * more difficult. 1284 * 1285 * XXX may want to control this with a driver 1286 * capability; this may also change when we pull 1287 * aggregation up into net80211 1288 */ 1289 seqno = ni->ni_txseqs[tid]++; 1290 *(uint16_t *)wh->i_seq = 1291 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1292 M_SEQNO_SET(m, seqno); 1293 } 1294 } else { 1295 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1296 *(uint16_t *)wh->i_seq = 1297 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1298 M_SEQNO_SET(m, seqno); 1299 } 1300 1301 1302 /* check if xmit fragmentation is required */ 1303 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1304 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1305 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1306 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1307 if (key != NULL) { 1308 /* 1309 * IEEE 802.1X: send EAPOL frames always in the clear. 1310 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1311 */ 1312 if ((m->m_flags & M_EAPOL) == 0 || 1313 ((vap->iv_flags & IEEE80211_F_WPA) && 1314 (vap->iv_opmode == IEEE80211_M_STA ? 1315 !IEEE80211_KEY_UNDEFINED(key) : 1316 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1317 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1318 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1319 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1320 eh.ether_dhost, 1321 "%s", "enmic failed, discard frame"); 1322 vap->iv_stats.is_crypto_enmicfail++; 1323 goto bad; 1324 } 1325 } 1326 } 1327 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1328 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1329 goto bad; 1330 1331 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1332 1333 IEEE80211_NODE_STAT(ni, tx_data); 1334 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1335 IEEE80211_NODE_STAT(ni, tx_mcast); 1336 m->m_flags |= M_MCAST; 1337 } else 1338 IEEE80211_NODE_STAT(ni, tx_ucast); 1339 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1340 1341 return m; 1342bad: 1343 if (m != NULL) 1344 m_freem(m); 1345 return NULL; 1346#undef WH4 1347} 1348 1349/* 1350 * Fragment the frame according to the specified mtu. 1351 * The size of the 802.11 header (w/o padding) is provided 1352 * so we don't need to recalculate it. We create a new 1353 * mbuf for each fragment and chain it through m_nextpkt; 1354 * we might be able to optimize this by reusing the original 1355 * packet's mbufs but that is significantly more complicated. 1356 */ 1357static int 1358ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1359 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1360{ 1361 struct ieee80211_frame *wh, *whf; 1362 struct mbuf *m, *prev, *next; 1363 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1364 1365 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1366 KASSERT(m0->m_pkthdr.len > mtu, 1367 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1368 1369 wh = mtod(m0, struct ieee80211_frame *); 1370 /* NB: mark the first frag; it will be propagated below */ 1371 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1372 totalhdrsize = hdrsize + ciphdrsize; 1373 fragno = 1; 1374 off = mtu - ciphdrsize; 1375 remainder = m0->m_pkthdr.len - off; 1376 prev = m0; 1377 do { 1378 fragsize = totalhdrsize + remainder; 1379 if (fragsize > mtu) 1380 fragsize = mtu; 1381 /* XXX fragsize can be >2048! */ 1382 KASSERT(fragsize < MCLBYTES, 1383 ("fragment size %u too big!", fragsize)); 1384 if (fragsize > MHLEN) 1385 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1386 else 1387 m = m_gethdr(M_DONTWAIT, MT_DATA); 1388 if (m == NULL) 1389 goto bad; 1390 /* leave room to prepend any cipher header */ 1391 m_align(m, fragsize - ciphdrsize); 1392 1393 /* 1394 * Form the header in the fragment. Note that since 1395 * we mark the first fragment with the MORE_FRAG bit 1396 * it automatically is propagated to each fragment; we 1397 * need only clear it on the last fragment (done below). 1398 */ 1399 whf = mtod(m, struct ieee80211_frame *); 1400 memcpy(whf, wh, hdrsize); 1401 *(uint16_t *)&whf->i_seq[0] |= htole16( 1402 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1403 IEEE80211_SEQ_FRAG_SHIFT); 1404 fragno++; 1405 1406 payload = fragsize - totalhdrsize; 1407 /* NB: destination is known to be contiguous */ 1408 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1409 m->m_len = hdrsize + payload; 1410 m->m_pkthdr.len = hdrsize + payload; 1411 m->m_flags |= M_FRAG; 1412 1413 /* chain up the fragment */ 1414 prev->m_nextpkt = m; 1415 prev = m; 1416 1417 /* deduct fragment just formed */ 1418 remainder -= payload; 1419 off += payload; 1420 } while (remainder != 0); 1421 1422 /* set the last fragment */ 1423 m->m_flags |= M_LASTFRAG; 1424 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1425 1426 /* strip first mbuf now that everything has been copied */ 1427 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1428 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1429 1430 vap->iv_stats.is_tx_fragframes++; 1431 vap->iv_stats.is_tx_frags += fragno-1; 1432 1433 return 1; 1434bad: 1435 /* reclaim fragments but leave original frame for caller to free */ 1436 for (m = m0->m_nextpkt; m != NULL; m = next) { 1437 next = m->m_nextpkt; 1438 m->m_nextpkt = NULL; /* XXX paranoid */ 1439 m_freem(m); 1440 } 1441 m0->m_nextpkt = NULL; 1442 return 0; 1443} 1444 1445/* 1446 * Add a supported rates element id to a frame. 1447 */ 1448uint8_t * 1449ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1450{ 1451 int nrates; 1452 1453 *frm++ = IEEE80211_ELEMID_RATES; 1454 nrates = rs->rs_nrates; 1455 if (nrates > IEEE80211_RATE_SIZE) 1456 nrates = IEEE80211_RATE_SIZE; 1457 *frm++ = nrates; 1458 memcpy(frm, rs->rs_rates, nrates); 1459 return frm + nrates; 1460} 1461 1462/* 1463 * Add an extended supported rates element id to a frame. 1464 */ 1465uint8_t * 1466ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1467{ 1468 /* 1469 * Add an extended supported rates element if operating in 11g mode. 1470 */ 1471 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1472 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1473 *frm++ = IEEE80211_ELEMID_XRATES; 1474 *frm++ = nrates; 1475 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1476 frm += nrates; 1477 } 1478 return frm; 1479} 1480 1481/* 1482 * Add an ssid element to a frame. 1483 */ 1484static uint8_t * 1485ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1486{ 1487 *frm++ = IEEE80211_ELEMID_SSID; 1488 *frm++ = len; 1489 memcpy(frm, ssid, len); 1490 return frm + len; 1491} 1492 1493/* 1494 * Add an erp element to a frame. 1495 */ 1496static uint8_t * 1497ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1498{ 1499 uint8_t erp; 1500 1501 *frm++ = IEEE80211_ELEMID_ERP; 1502 *frm++ = 1; 1503 erp = 0; 1504 if (ic->ic_nonerpsta != 0) 1505 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1506 if (ic->ic_flags & IEEE80211_F_USEPROT) 1507 erp |= IEEE80211_ERP_USE_PROTECTION; 1508 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1509 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1510 *frm++ = erp; 1511 return frm; 1512} 1513 1514/* 1515 * Add a CFParams element to a frame. 1516 */ 1517static uint8_t * 1518ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1519{ 1520#define ADDSHORT(frm, v) do { \ 1521 LE_WRITE_2(frm, v); \ 1522 frm += 2; \ 1523} while (0) 1524 *frm++ = IEEE80211_ELEMID_CFPARMS; 1525 *frm++ = 6; 1526 *frm++ = 0; /* CFP count */ 1527 *frm++ = 2; /* CFP period */ 1528 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1529 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1530 return frm; 1531#undef ADDSHORT 1532} 1533 1534static __inline uint8_t * 1535add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1536{ 1537 memcpy(frm, ie->ie_data, ie->ie_len); 1538 return frm + ie->ie_len; 1539} 1540 1541static __inline uint8_t * 1542add_ie(uint8_t *frm, const uint8_t *ie) 1543{ 1544 memcpy(frm, ie, 2 + ie[1]); 1545 return frm + 2 + ie[1]; 1546} 1547 1548#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1549/* 1550 * Add a WME information element to a frame. 1551 */ 1552static uint8_t * 1553ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1554{ 1555 static const struct ieee80211_wme_info info = { 1556 .wme_id = IEEE80211_ELEMID_VENDOR, 1557 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1558 .wme_oui = { WME_OUI_BYTES }, 1559 .wme_type = WME_OUI_TYPE, 1560 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1561 .wme_version = WME_VERSION, 1562 .wme_info = 0, 1563 }; 1564 memcpy(frm, &info, sizeof(info)); 1565 return frm + sizeof(info); 1566} 1567 1568/* 1569 * Add a WME parameters element to a frame. 1570 */ 1571static uint8_t * 1572ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1573{ 1574#define SM(_v, _f) (((_v) << _f##_S) & _f) 1575#define ADDSHORT(frm, v) do { \ 1576 LE_WRITE_2(frm, v); \ 1577 frm += 2; \ 1578} while (0) 1579 /* NB: this works 'cuz a param has an info at the front */ 1580 static const struct ieee80211_wme_info param = { 1581 .wme_id = IEEE80211_ELEMID_VENDOR, 1582 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1583 .wme_oui = { WME_OUI_BYTES }, 1584 .wme_type = WME_OUI_TYPE, 1585 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1586 .wme_version = WME_VERSION, 1587 }; 1588 int i; 1589 1590 memcpy(frm, ¶m, sizeof(param)); 1591 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1592 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1593 *frm++ = 0; /* reserved field */ 1594 for (i = 0; i < WME_NUM_AC; i++) { 1595 const struct wmeParams *ac = 1596 &wme->wme_bssChanParams.cap_wmeParams[i]; 1597 *frm++ = SM(i, WME_PARAM_ACI) 1598 | SM(ac->wmep_acm, WME_PARAM_ACM) 1599 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1600 ; 1601 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1602 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1603 ; 1604 ADDSHORT(frm, ac->wmep_txopLimit); 1605 } 1606 return frm; 1607#undef SM 1608#undef ADDSHORT 1609} 1610#undef WME_OUI_BYTES 1611 1612/* 1613 * Add an 11h Power Constraint element to a frame. 1614 */ 1615static uint8_t * 1616ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1617{ 1618 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1619 /* XXX per-vap tx power limit? */ 1620 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1621 1622 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1623 frm[1] = 1; 1624 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1625 return frm + 3; 1626} 1627 1628/* 1629 * Add an 11h Power Capability element to a frame. 1630 */ 1631static uint8_t * 1632ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1633{ 1634 frm[0] = IEEE80211_ELEMID_PWRCAP; 1635 frm[1] = 2; 1636 frm[2] = c->ic_minpower; 1637 frm[3] = c->ic_maxpower; 1638 return frm + 4; 1639} 1640 1641/* 1642 * Add an 11h Supported Channels element to a frame. 1643 */ 1644static uint8_t * 1645ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1646{ 1647 static const int ielen = 26; 1648 1649 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1650 frm[1] = ielen; 1651 /* XXX not correct */ 1652 memcpy(frm+2, ic->ic_chan_avail, ielen); 1653 return frm + 2 + ielen; 1654} 1655 1656/* 1657 * Add an 11h Channel Switch Announcement element to a frame. 1658 * Note that we use the per-vap CSA count to adjust the global 1659 * counter so we can use this routine to form probe response 1660 * frames and get the current count. 1661 */ 1662static uint8_t * 1663ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1664{ 1665 struct ieee80211com *ic = vap->iv_ic; 1666 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1667 1668 csa->csa_ie = IEEE80211_ELEMID_CSA; 1669 csa->csa_len = 3; 1670 csa->csa_mode = 1; /* XXX force quiet on channel */ 1671 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1672 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1673 return frm + sizeof(*csa); 1674} 1675 1676/* 1677 * Add an 11h country information element to a frame. 1678 */ 1679static uint8_t * 1680ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1681{ 1682 1683 if (ic->ic_countryie == NULL || 1684 ic->ic_countryie_chan != ic->ic_bsschan) { 1685 /* 1686 * Handle lazy construction of ie. This is done on 1687 * first use and after a channel change that requires 1688 * re-calculation. 1689 */ 1690 if (ic->ic_countryie != NULL) 1691 free(ic->ic_countryie, M_80211_NODE_IE); 1692 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1693 if (ic->ic_countryie == NULL) 1694 return frm; 1695 ic->ic_countryie_chan = ic->ic_bsschan; 1696 } 1697 return add_appie(frm, ic->ic_countryie); 1698} 1699 1700/* 1701 * Send a probe request frame with the specified ssid 1702 * and any optional information element data. 1703 */ 1704int 1705ieee80211_send_probereq(struct ieee80211_node *ni, 1706 const uint8_t sa[IEEE80211_ADDR_LEN], 1707 const uint8_t da[IEEE80211_ADDR_LEN], 1708 const uint8_t bssid[IEEE80211_ADDR_LEN], 1709 const uint8_t *ssid, size_t ssidlen) 1710{ 1711 struct ieee80211vap *vap = ni->ni_vap; 1712 struct ieee80211com *ic = ni->ni_ic; 1713 const struct ieee80211_txparam *tp; 1714 struct ieee80211_bpf_params params; 1715 struct ieee80211_frame *wh; 1716 const struct ieee80211_rateset *rs; 1717 struct mbuf *m; 1718 uint8_t *frm; 1719 1720 if (vap->iv_state == IEEE80211_S_CAC) { 1721 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1722 "block %s frame in CAC state", "probe request"); 1723 vap->iv_stats.is_tx_badstate++; 1724 return EIO; /* XXX */ 1725 } 1726 1727 /* 1728 * Hold a reference on the node so it doesn't go away until after 1729 * the xmit is complete all the way in the driver. On error we 1730 * will remove our reference. 1731 */ 1732 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1733 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1734 __func__, __LINE__, 1735 ni, ether_sprintf(ni->ni_macaddr), 1736 ieee80211_node_refcnt(ni)+1); 1737 ieee80211_ref_node(ni); 1738 1739 /* 1740 * prreq frame format 1741 * [tlv] ssid 1742 * [tlv] supported rates 1743 * [tlv] RSN (optional) 1744 * [tlv] extended supported rates 1745 * [tlv] WPA (optional) 1746 * [tlv] user-specified ie's 1747 */ 1748 m = ieee80211_getmgtframe(&frm, 1749 ic->ic_headroom + sizeof(struct ieee80211_frame), 1750 2 + IEEE80211_NWID_LEN 1751 + 2 + IEEE80211_RATE_SIZE 1752 + sizeof(struct ieee80211_ie_wpa) 1753 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1754 + sizeof(struct ieee80211_ie_wpa) 1755 + (vap->iv_appie_probereq != NULL ? 1756 vap->iv_appie_probereq->ie_len : 0) 1757 ); 1758 if (m == NULL) { 1759 vap->iv_stats.is_tx_nobuf++; 1760 ieee80211_free_node(ni); 1761 return ENOMEM; 1762 } 1763 1764 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1765 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1766 frm = ieee80211_add_rates(frm, rs); 1767 if (vap->iv_flags & IEEE80211_F_WPA2) { 1768 if (vap->iv_rsn_ie != NULL) 1769 frm = add_ie(frm, vap->iv_rsn_ie); 1770 /* XXX else complain? */ 1771 } 1772 frm = ieee80211_add_xrates(frm, rs); 1773 if (vap->iv_flags & IEEE80211_F_WPA1) { 1774 if (vap->iv_wpa_ie != NULL) 1775 frm = add_ie(frm, vap->iv_wpa_ie); 1776 /* XXX else complain? */ 1777 } 1778 if (vap->iv_appie_probereq != NULL) 1779 frm = add_appie(frm, vap->iv_appie_probereq); 1780 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1781 1782 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1783 ("leading space %zd", M_LEADINGSPACE(m))); 1784 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1785 if (m == NULL) { 1786 /* NB: cannot happen */ 1787 ieee80211_free_node(ni); 1788 return ENOMEM; 1789 } 1790 1791 wh = mtod(m, struct ieee80211_frame *); 1792 ieee80211_send_setup(ni, m, 1793 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1794 IEEE80211_NONQOS_TID, sa, da, bssid); 1795 /* XXX power management? */ 1796 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1797 1798 M_WME_SETAC(m, WME_AC_BE); 1799 1800 IEEE80211_NODE_STAT(ni, tx_probereq); 1801 IEEE80211_NODE_STAT(ni, tx_mgmt); 1802 1803 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1804 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1805 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1806 ssidlen, ssid); 1807 1808 memset(¶ms, 0, sizeof(params)); 1809 params.ibp_pri = M_WME_GETAC(m); 1810 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1811 params.ibp_rate0 = tp->mgmtrate; 1812 if (IEEE80211_IS_MULTICAST(da)) { 1813 params.ibp_flags |= IEEE80211_BPF_NOACK; 1814 params.ibp_try0 = 1; 1815 } else 1816 params.ibp_try0 = tp->maxretry; 1817 params.ibp_power = ni->ni_txpower; 1818 return ic->ic_raw_xmit(ni, m, ¶ms); 1819} 1820 1821/* 1822 * Calculate capability information for mgt frames. 1823 */ 1824uint16_t 1825ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1826{ 1827 struct ieee80211com *ic = vap->iv_ic; 1828 uint16_t capinfo; 1829 1830 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1831 1832 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1833 capinfo = IEEE80211_CAPINFO_ESS; 1834 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1835 capinfo = IEEE80211_CAPINFO_IBSS; 1836 else 1837 capinfo = 0; 1838 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1839 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1840 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1841 IEEE80211_IS_CHAN_2GHZ(chan)) 1842 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1843 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1844 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1845 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1846 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1847 return capinfo; 1848} 1849 1850/* 1851 * Send a management frame. The node is for the destination (or ic_bss 1852 * when in station mode). Nodes other than ic_bss have their reference 1853 * count bumped to reflect our use for an indeterminant time. 1854 */ 1855int 1856ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1857{ 1858#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1859#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1860 struct ieee80211vap *vap = ni->ni_vap; 1861 struct ieee80211com *ic = ni->ni_ic; 1862 struct ieee80211_node *bss = vap->iv_bss; 1863 struct ieee80211_bpf_params params; 1864 struct mbuf *m; 1865 uint8_t *frm; 1866 uint16_t capinfo; 1867 int has_challenge, is_shared_key, ret, status; 1868 1869 KASSERT(ni != NULL, ("null node")); 1870 1871 /* 1872 * Hold a reference on the node so it doesn't go away until after 1873 * the xmit is complete all the way in the driver. On error we 1874 * will remove our reference. 1875 */ 1876 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1877 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1878 __func__, __LINE__, 1879 ni, ether_sprintf(ni->ni_macaddr), 1880 ieee80211_node_refcnt(ni)+1); 1881 ieee80211_ref_node(ni); 1882 1883 memset(¶ms, 0, sizeof(params)); 1884 switch (type) { 1885 1886 case IEEE80211_FC0_SUBTYPE_AUTH: 1887 status = arg >> 16; 1888 arg &= 0xffff; 1889 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1890 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1891 ni->ni_challenge != NULL); 1892 1893 /* 1894 * Deduce whether we're doing open authentication or 1895 * shared key authentication. We do the latter if 1896 * we're in the middle of a shared key authentication 1897 * handshake or if we're initiating an authentication 1898 * request and configured to use shared key. 1899 */ 1900 is_shared_key = has_challenge || 1901 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1902 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1903 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1904 1905 m = ieee80211_getmgtframe(&frm, 1906 ic->ic_headroom + sizeof(struct ieee80211_frame), 1907 3 * sizeof(uint16_t) 1908 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1909 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1910 ); 1911 if (m == NULL) 1912 senderr(ENOMEM, is_tx_nobuf); 1913 1914 ((uint16_t *)frm)[0] = 1915 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1916 : htole16(IEEE80211_AUTH_ALG_OPEN); 1917 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1918 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1919 1920 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1921 ((uint16_t *)frm)[3] = 1922 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1923 IEEE80211_ELEMID_CHALLENGE); 1924 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1925 IEEE80211_CHALLENGE_LEN); 1926 m->m_pkthdr.len = m->m_len = 1927 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1928 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1929 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1930 "request encrypt frame (%s)", __func__); 1931 /* mark frame for encryption */ 1932 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1933 } 1934 } else 1935 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1936 1937 /* XXX not right for shared key */ 1938 if (status == IEEE80211_STATUS_SUCCESS) 1939 IEEE80211_NODE_STAT(ni, tx_auth); 1940 else 1941 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1942 1943 if (vap->iv_opmode == IEEE80211_M_STA) 1944 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1945 (void *) vap->iv_state); 1946 break; 1947 1948 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1949 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1950 "send station deauthenticate (reason %d)", arg); 1951 m = ieee80211_getmgtframe(&frm, 1952 ic->ic_headroom + sizeof(struct ieee80211_frame), 1953 sizeof(uint16_t)); 1954 if (m == NULL) 1955 senderr(ENOMEM, is_tx_nobuf); 1956 *(uint16_t *)frm = htole16(arg); /* reason */ 1957 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1958 1959 IEEE80211_NODE_STAT(ni, tx_deauth); 1960 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1961 1962 ieee80211_node_unauthorize(ni); /* port closed */ 1963 break; 1964 1965 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1966 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1967 /* 1968 * asreq frame format 1969 * [2] capability information 1970 * [2] listen interval 1971 * [6*] current AP address (reassoc only) 1972 * [tlv] ssid 1973 * [tlv] supported rates 1974 * [tlv] extended supported rates 1975 * [4] power capability (optional) 1976 * [28] supported channels (optional) 1977 * [tlv] HT capabilities 1978 * [tlv] WME (optional) 1979 * [tlv] Vendor OUI HT capabilities (optional) 1980 * [tlv] Atheros capabilities (if negotiated) 1981 * [tlv] AppIE's (optional) 1982 */ 1983 m = ieee80211_getmgtframe(&frm, 1984 ic->ic_headroom + sizeof(struct ieee80211_frame), 1985 sizeof(uint16_t) 1986 + sizeof(uint16_t) 1987 + IEEE80211_ADDR_LEN 1988 + 2 + IEEE80211_NWID_LEN 1989 + 2 + IEEE80211_RATE_SIZE 1990 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1991 + 4 1992 + 2 + 26 1993 + sizeof(struct ieee80211_wme_info) 1994 + sizeof(struct ieee80211_ie_htcap) 1995 + 4 + sizeof(struct ieee80211_ie_htcap) 1996#ifdef IEEE80211_SUPPORT_SUPERG 1997 + sizeof(struct ieee80211_ath_ie) 1998#endif 1999 + (vap->iv_appie_wpa != NULL ? 2000 vap->iv_appie_wpa->ie_len : 0) 2001 + (vap->iv_appie_assocreq != NULL ? 2002 vap->iv_appie_assocreq->ie_len : 0) 2003 ); 2004 if (m == NULL) 2005 senderr(ENOMEM, is_tx_nobuf); 2006 2007 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2008 ("wrong mode %u", vap->iv_opmode)); 2009 capinfo = IEEE80211_CAPINFO_ESS; 2010 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2011 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2012 /* 2013 * NB: Some 11a AP's reject the request when 2014 * short premable is set. 2015 */ 2016 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2017 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2018 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2019 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2020 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2021 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2022 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2023 (vap->iv_flags & IEEE80211_F_DOTH)) 2024 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2025 *(uint16_t *)frm = htole16(capinfo); 2026 frm += 2; 2027 2028 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2029 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2030 bss->ni_intval)); 2031 frm += 2; 2032 2033 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2034 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2035 frm += IEEE80211_ADDR_LEN; 2036 } 2037 2038 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2039 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2040 if (vap->iv_flags & IEEE80211_F_WPA2) { 2041 if (vap->iv_rsn_ie != NULL) 2042 frm = add_ie(frm, vap->iv_rsn_ie); 2043 /* XXX else complain? */ 2044 } 2045 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2046 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2047 frm = ieee80211_add_powercapability(frm, 2048 ic->ic_curchan); 2049 frm = ieee80211_add_supportedchannels(frm, ic); 2050 } 2051 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2052 ni->ni_ies.htcap_ie != NULL && 2053 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2054 frm = ieee80211_add_htcap(frm, ni); 2055 if (vap->iv_flags & IEEE80211_F_WPA1) { 2056 if (vap->iv_wpa_ie != NULL) 2057 frm = add_ie(frm, vap->iv_wpa_ie); 2058 /* XXX else complain */ 2059 } 2060 if ((ic->ic_flags & IEEE80211_F_WME) && 2061 ni->ni_ies.wme_ie != NULL) 2062 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2063 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2064 ni->ni_ies.htcap_ie != NULL && 2065 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2066 frm = ieee80211_add_htcap_vendor(frm, ni); 2067#ifdef IEEE80211_SUPPORT_SUPERG 2068 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2069 frm = ieee80211_add_ath(frm, 2070 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2071 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2072 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2073 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2074 } 2075#endif /* IEEE80211_SUPPORT_SUPERG */ 2076 if (vap->iv_appie_assocreq != NULL) 2077 frm = add_appie(frm, vap->iv_appie_assocreq); 2078 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2079 2080 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2081 (void *) vap->iv_state); 2082 break; 2083 2084 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2085 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2086 /* 2087 * asresp frame format 2088 * [2] capability information 2089 * [2] status 2090 * [2] association ID 2091 * [tlv] supported rates 2092 * [tlv] extended supported rates 2093 * [tlv] HT capabilities (standard, if STA enabled) 2094 * [tlv] HT information (standard, if STA enabled) 2095 * [tlv] WME (if configured and STA enabled) 2096 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2097 * [tlv] HT information (vendor OUI, if STA enabled) 2098 * [tlv] Atheros capabilities (if STA enabled) 2099 * [tlv] AppIE's (optional) 2100 */ 2101 m = ieee80211_getmgtframe(&frm, 2102 ic->ic_headroom + sizeof(struct ieee80211_frame), 2103 sizeof(uint16_t) 2104 + sizeof(uint16_t) 2105 + sizeof(uint16_t) 2106 + 2 + IEEE80211_RATE_SIZE 2107 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2108 + sizeof(struct ieee80211_ie_htcap) + 4 2109 + sizeof(struct ieee80211_ie_htinfo) + 4 2110 + sizeof(struct ieee80211_wme_param) 2111#ifdef IEEE80211_SUPPORT_SUPERG 2112 + sizeof(struct ieee80211_ath_ie) 2113#endif 2114 + (vap->iv_appie_assocresp != NULL ? 2115 vap->iv_appie_assocresp->ie_len : 0) 2116 ); 2117 if (m == NULL) 2118 senderr(ENOMEM, is_tx_nobuf); 2119 2120 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2121 *(uint16_t *)frm = htole16(capinfo); 2122 frm += 2; 2123 2124 *(uint16_t *)frm = htole16(arg); /* status */ 2125 frm += 2; 2126 2127 if (arg == IEEE80211_STATUS_SUCCESS) { 2128 *(uint16_t *)frm = htole16(ni->ni_associd); 2129 IEEE80211_NODE_STAT(ni, tx_assoc); 2130 } else 2131 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2132 frm += 2; 2133 2134 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2135 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2136 /* NB: respond according to what we received */ 2137 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2138 frm = ieee80211_add_htcap(frm, ni); 2139 frm = ieee80211_add_htinfo(frm, ni); 2140 } 2141 if ((vap->iv_flags & IEEE80211_F_WME) && 2142 ni->ni_ies.wme_ie != NULL) 2143 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2144 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2145 frm = ieee80211_add_htcap_vendor(frm, ni); 2146 frm = ieee80211_add_htinfo_vendor(frm, ni); 2147 } 2148#ifdef IEEE80211_SUPPORT_SUPERG 2149 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2150 frm = ieee80211_add_ath(frm, 2151 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2152 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2153 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2154 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2155#endif /* IEEE80211_SUPPORT_SUPERG */ 2156 if (vap->iv_appie_assocresp != NULL) 2157 frm = add_appie(frm, vap->iv_appie_assocresp); 2158 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2159 break; 2160 2161 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2162 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2163 "send station disassociate (reason %d)", arg); 2164 m = ieee80211_getmgtframe(&frm, 2165 ic->ic_headroom + sizeof(struct ieee80211_frame), 2166 sizeof(uint16_t)); 2167 if (m == NULL) 2168 senderr(ENOMEM, is_tx_nobuf); 2169 *(uint16_t *)frm = htole16(arg); /* reason */ 2170 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2171 2172 IEEE80211_NODE_STAT(ni, tx_disassoc); 2173 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2174 break; 2175 2176 default: 2177 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2178 "invalid mgmt frame type %u", type); 2179 senderr(EINVAL, is_tx_unknownmgt); 2180 /* NOTREACHED */ 2181 } 2182 2183 /* NB: force non-ProbeResp frames to the highest queue */ 2184 params.ibp_pri = WME_AC_VO; 2185 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2186 /* NB: we know all frames are unicast */ 2187 params.ibp_try0 = bss->ni_txparms->maxretry; 2188 params.ibp_power = bss->ni_txpower; 2189 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2190bad: 2191 ieee80211_free_node(ni); 2192 return ret; 2193#undef senderr 2194#undef HTFLAGS 2195} 2196 2197/* 2198 * Return an mbuf with a probe response frame in it. 2199 * Space is left to prepend and 802.11 header at the 2200 * front but it's left to the caller to fill in. 2201 */ 2202struct mbuf * 2203ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2204{ 2205 struct ieee80211vap *vap = bss->ni_vap; 2206 struct ieee80211com *ic = bss->ni_ic; 2207 const struct ieee80211_rateset *rs; 2208 struct mbuf *m; 2209 uint16_t capinfo; 2210 uint8_t *frm; 2211 2212 /* 2213 * probe response frame format 2214 * [8] time stamp 2215 * [2] beacon interval 2216 * [2] cabability information 2217 * [tlv] ssid 2218 * [tlv] supported rates 2219 * [tlv] parameter set (FH/DS) 2220 * [tlv] parameter set (IBSS) 2221 * [tlv] country (optional) 2222 * [3] power control (optional) 2223 * [5] channel switch announcement (CSA) (optional) 2224 * [tlv] extended rate phy (ERP) 2225 * [tlv] extended supported rates 2226 * [tlv] RSN (optional) 2227 * [tlv] HT capabilities 2228 * [tlv] HT information 2229 * [tlv] WPA (optional) 2230 * [tlv] WME (optional) 2231 * [tlv] Vendor OUI HT capabilities (optional) 2232 * [tlv] Vendor OUI HT information (optional) 2233 * [tlv] Atheros capabilities 2234 * [tlv] AppIE's (optional) 2235 * [tlv] Mesh ID (MBSS) 2236 * [tlv] Mesh Conf (MBSS) 2237 */ 2238 m = ieee80211_getmgtframe(&frm, 2239 ic->ic_headroom + sizeof(struct ieee80211_frame), 2240 8 2241 + sizeof(uint16_t) 2242 + sizeof(uint16_t) 2243 + 2 + IEEE80211_NWID_LEN 2244 + 2 + IEEE80211_RATE_SIZE 2245 + 7 /* max(7,3) */ 2246 + IEEE80211_COUNTRY_MAX_SIZE 2247 + 3 2248 + sizeof(struct ieee80211_csa_ie) 2249 + 3 2250 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2251 + sizeof(struct ieee80211_ie_wpa) 2252 + sizeof(struct ieee80211_ie_htcap) 2253 + sizeof(struct ieee80211_ie_htinfo) 2254 + sizeof(struct ieee80211_ie_wpa) 2255 + sizeof(struct ieee80211_wme_param) 2256 + 4 + sizeof(struct ieee80211_ie_htcap) 2257 + 4 + sizeof(struct ieee80211_ie_htinfo) 2258#ifdef IEEE80211_SUPPORT_SUPERG 2259 + sizeof(struct ieee80211_ath_ie) 2260#endif 2261#ifdef IEEE80211_SUPPORT_MESH 2262 + 2 + IEEE80211_MESHID_LEN 2263 + sizeof(struct ieee80211_meshconf_ie) 2264#endif 2265 + (vap->iv_appie_proberesp != NULL ? 2266 vap->iv_appie_proberesp->ie_len : 0) 2267 ); 2268 if (m == NULL) { 2269 vap->iv_stats.is_tx_nobuf++; 2270 return NULL; 2271 } 2272 2273 memset(frm, 0, 8); /* timestamp should be filled later */ 2274 frm += 8; 2275 *(uint16_t *)frm = htole16(bss->ni_intval); 2276 frm += 2; 2277 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2278 *(uint16_t *)frm = htole16(capinfo); 2279 frm += 2; 2280 2281 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2282 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2283 frm = ieee80211_add_rates(frm, rs); 2284 2285 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2286 *frm++ = IEEE80211_ELEMID_FHPARMS; 2287 *frm++ = 5; 2288 *frm++ = bss->ni_fhdwell & 0x00ff; 2289 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2290 *frm++ = IEEE80211_FH_CHANSET( 2291 ieee80211_chan2ieee(ic, bss->ni_chan)); 2292 *frm++ = IEEE80211_FH_CHANPAT( 2293 ieee80211_chan2ieee(ic, bss->ni_chan)); 2294 *frm++ = bss->ni_fhindex; 2295 } else { 2296 *frm++ = IEEE80211_ELEMID_DSPARMS; 2297 *frm++ = 1; 2298 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2299 } 2300 2301 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2302 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2303 *frm++ = 2; 2304 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2305 } 2306 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2307 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2308 frm = ieee80211_add_countryie(frm, ic); 2309 if (vap->iv_flags & IEEE80211_F_DOTH) { 2310 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2311 frm = ieee80211_add_powerconstraint(frm, vap); 2312 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2313 frm = ieee80211_add_csa(frm, vap); 2314 } 2315 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2316 frm = ieee80211_add_erp(frm, ic); 2317 frm = ieee80211_add_xrates(frm, rs); 2318 if (vap->iv_flags & IEEE80211_F_WPA2) { 2319 if (vap->iv_rsn_ie != NULL) 2320 frm = add_ie(frm, vap->iv_rsn_ie); 2321 /* XXX else complain? */ 2322 } 2323 /* 2324 * NB: legacy 11b clients do not get certain ie's. 2325 * The caller identifies such clients by passing 2326 * a token in legacy to us. Could expand this to be 2327 * any legacy client for stuff like HT ie's. 2328 */ 2329 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2330 legacy != IEEE80211_SEND_LEGACY_11B) { 2331 frm = ieee80211_add_htcap(frm, bss); 2332 frm = ieee80211_add_htinfo(frm, bss); 2333 } 2334 if (vap->iv_flags & IEEE80211_F_WPA1) { 2335 if (vap->iv_wpa_ie != NULL) 2336 frm = add_ie(frm, vap->iv_wpa_ie); 2337 /* XXX else complain? */ 2338 } 2339 if (vap->iv_flags & IEEE80211_F_WME) 2340 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2341 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2342 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2343 legacy != IEEE80211_SEND_LEGACY_11B) { 2344 frm = ieee80211_add_htcap_vendor(frm, bss); 2345 frm = ieee80211_add_htinfo_vendor(frm, bss); 2346 } 2347#ifdef IEEE80211_SUPPORT_SUPERG 2348 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2349 legacy != IEEE80211_SEND_LEGACY_11B) 2350 frm = ieee80211_add_athcaps(frm, bss); 2351#endif 2352 if (vap->iv_appie_proberesp != NULL) 2353 frm = add_appie(frm, vap->iv_appie_proberesp); 2354#ifdef IEEE80211_SUPPORT_MESH 2355 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2356 frm = ieee80211_add_meshid(frm, vap); 2357 frm = ieee80211_add_meshconf(frm, vap); 2358 } 2359#endif 2360 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2361 2362 return m; 2363} 2364 2365/* 2366 * Send a probe response frame to the specified mac address. 2367 * This does not go through the normal mgt frame api so we 2368 * can specify the destination address and re-use the bss node 2369 * for the sta reference. 2370 */ 2371int 2372ieee80211_send_proberesp(struct ieee80211vap *vap, 2373 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2374{ 2375 struct ieee80211_node *bss = vap->iv_bss; 2376 struct ieee80211com *ic = vap->iv_ic; 2377 struct ieee80211_frame *wh; 2378 struct mbuf *m; 2379 2380 if (vap->iv_state == IEEE80211_S_CAC) { 2381 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2382 "block %s frame in CAC state", "probe response"); 2383 vap->iv_stats.is_tx_badstate++; 2384 return EIO; /* XXX */ 2385 } 2386 2387 /* 2388 * Hold a reference on the node so it doesn't go away until after 2389 * the xmit is complete all the way in the driver. On error we 2390 * will remove our reference. 2391 */ 2392 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2393 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2394 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2395 ieee80211_node_refcnt(bss)+1); 2396 ieee80211_ref_node(bss); 2397 2398 m = ieee80211_alloc_proberesp(bss, legacy); 2399 if (m == NULL) { 2400 ieee80211_free_node(bss); 2401 return ENOMEM; 2402 } 2403 2404 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2405 KASSERT(m != NULL, ("no room for header")); 2406 2407 wh = mtod(m, struct ieee80211_frame *); 2408 ieee80211_send_setup(bss, m, 2409 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2410 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2411 /* XXX power management? */ 2412 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2413 2414 M_WME_SETAC(m, WME_AC_BE); 2415 2416 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2417 "send probe resp on channel %u to %s%s\n", 2418 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2419 legacy ? " <legacy>" : ""); 2420 IEEE80211_NODE_STAT(bss, tx_mgmt); 2421 2422 return ic->ic_raw_xmit(bss, m, NULL); 2423} 2424 2425/* 2426 * Allocate and build a RTS (Request To Send) control frame. 2427 */ 2428struct mbuf * 2429ieee80211_alloc_rts(struct ieee80211com *ic, 2430 const uint8_t ra[IEEE80211_ADDR_LEN], 2431 const uint8_t ta[IEEE80211_ADDR_LEN], 2432 uint16_t dur) 2433{ 2434 struct ieee80211_frame_rts *rts; 2435 struct mbuf *m; 2436 2437 /* XXX honor ic_headroom */ 2438 m = m_gethdr(M_DONTWAIT, MT_DATA); 2439 if (m != NULL) { 2440 rts = mtod(m, struct ieee80211_frame_rts *); 2441 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2442 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2443 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2444 *(u_int16_t *)rts->i_dur = htole16(dur); 2445 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2446 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2447 2448 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2449 } 2450 return m; 2451} 2452 2453/* 2454 * Allocate and build a CTS (Clear To Send) control frame. 2455 */ 2456struct mbuf * 2457ieee80211_alloc_cts(struct ieee80211com *ic, 2458 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2459{ 2460 struct ieee80211_frame_cts *cts; 2461 struct mbuf *m; 2462 2463 /* XXX honor ic_headroom */ 2464 m = m_gethdr(M_DONTWAIT, MT_DATA); 2465 if (m != NULL) { 2466 cts = mtod(m, struct ieee80211_frame_cts *); 2467 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2468 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2469 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2470 *(u_int16_t *)cts->i_dur = htole16(dur); 2471 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2472 2473 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2474 } 2475 return m; 2476} 2477 2478static void 2479ieee80211_tx_mgt_timeout(void *arg) 2480{ 2481 struct ieee80211_node *ni = arg; 2482 struct ieee80211vap *vap = ni->ni_vap; 2483 2484 if (vap->iv_state != IEEE80211_S_INIT && 2485 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2486 /* 2487 * NB: it's safe to specify a timeout as the reason here; 2488 * it'll only be used in the right state. 2489 */ 2490 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2491 IEEE80211_SCAN_FAIL_TIMEOUT); 2492 } 2493} 2494 2495static void 2496ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2497{ 2498 struct ieee80211vap *vap = ni->ni_vap; 2499 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2500 2501 /* 2502 * Frame transmit completed; arrange timer callback. If 2503 * transmit was successfuly we wait for response. Otherwise 2504 * we arrange an immediate callback instead of doing the 2505 * callback directly since we don't know what state the driver 2506 * is in (e.g. what locks it is holding). This work should 2507 * not be too time-critical and not happen too often so the 2508 * added overhead is acceptable. 2509 * 2510 * XXX what happens if !acked but response shows up before callback? 2511 */ 2512 if (vap->iv_state == ostate) 2513 callout_reset(&vap->iv_mgtsend, 2514 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2515 ieee80211_tx_mgt_timeout, ni); 2516} 2517 2518static void 2519ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2520 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2521{ 2522 struct ieee80211vap *vap = ni->ni_vap; 2523 struct ieee80211com *ic = ni->ni_ic; 2524 struct ieee80211_rateset *rs = &ni->ni_rates; 2525 uint16_t capinfo; 2526 2527 /* 2528 * beacon frame format 2529 * [8] time stamp 2530 * [2] beacon interval 2531 * [2] cabability information 2532 * [tlv] ssid 2533 * [tlv] supported rates 2534 * [3] parameter set (DS) 2535 * [8] CF parameter set (optional) 2536 * [tlv] parameter set (IBSS/TIM) 2537 * [tlv] country (optional) 2538 * [3] power control (optional) 2539 * [5] channel switch announcement (CSA) (optional) 2540 * [tlv] extended rate phy (ERP) 2541 * [tlv] extended supported rates 2542 * [tlv] RSN parameters 2543 * [tlv] HT capabilities 2544 * [tlv] HT information 2545 * XXX Vendor-specific OIDs (e.g. Atheros) 2546 * [tlv] WPA parameters 2547 * [tlv] WME parameters 2548 * [tlv] Vendor OUI HT capabilities (optional) 2549 * [tlv] Vendor OUI HT information (optional) 2550 * [tlv] Atheros capabilities (optional) 2551 * [tlv] TDMA parameters (optional) 2552 * [tlv] Mesh ID (MBSS) 2553 * [tlv] Mesh Conf (MBSS) 2554 * [tlv] application data (optional) 2555 */ 2556 2557 memset(bo, 0, sizeof(*bo)); 2558 2559 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2560 frm += 8; 2561 *(uint16_t *)frm = htole16(ni->ni_intval); 2562 frm += 2; 2563 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2564 bo->bo_caps = (uint16_t *)frm; 2565 *(uint16_t *)frm = htole16(capinfo); 2566 frm += 2; 2567 *frm++ = IEEE80211_ELEMID_SSID; 2568 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2569 *frm++ = ni->ni_esslen; 2570 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2571 frm += ni->ni_esslen; 2572 } else 2573 *frm++ = 0; 2574 frm = ieee80211_add_rates(frm, rs); 2575 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2576 *frm++ = IEEE80211_ELEMID_DSPARMS; 2577 *frm++ = 1; 2578 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2579 } 2580 if (ic->ic_flags & IEEE80211_F_PCF) { 2581 bo->bo_cfp = frm; 2582 frm = ieee80211_add_cfparms(frm, ic); 2583 } 2584 bo->bo_tim = frm; 2585 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2586 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2587 *frm++ = 2; 2588 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2589 bo->bo_tim_len = 0; 2590 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2591 vap->iv_opmode == IEEE80211_M_MBSS) { 2592 /* TIM IE is the same for Mesh and Hostap */ 2593 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2594 2595 tie->tim_ie = IEEE80211_ELEMID_TIM; 2596 tie->tim_len = 4; /* length */ 2597 tie->tim_count = 0; /* DTIM count */ 2598 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2599 tie->tim_bitctl = 0; /* bitmap control */ 2600 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2601 frm += sizeof(struct ieee80211_tim_ie); 2602 bo->bo_tim_len = 1; 2603 } 2604 bo->bo_tim_trailer = frm; 2605 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2606 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2607 frm = ieee80211_add_countryie(frm, ic); 2608 if (vap->iv_flags & IEEE80211_F_DOTH) { 2609 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2610 frm = ieee80211_add_powerconstraint(frm, vap); 2611 bo->bo_csa = frm; 2612 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2613 frm = ieee80211_add_csa(frm, vap); 2614 } else 2615 bo->bo_csa = frm; 2616 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2617 bo->bo_erp = frm; 2618 frm = ieee80211_add_erp(frm, ic); 2619 } 2620 frm = ieee80211_add_xrates(frm, rs); 2621 if (vap->iv_flags & IEEE80211_F_WPA2) { 2622 if (vap->iv_rsn_ie != NULL) 2623 frm = add_ie(frm, vap->iv_rsn_ie); 2624 /* XXX else complain */ 2625 } 2626 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2627 frm = ieee80211_add_htcap(frm, ni); 2628 bo->bo_htinfo = frm; 2629 frm = ieee80211_add_htinfo(frm, ni); 2630 } 2631 if (vap->iv_flags & IEEE80211_F_WPA1) { 2632 if (vap->iv_wpa_ie != NULL) 2633 frm = add_ie(frm, vap->iv_wpa_ie); 2634 /* XXX else complain */ 2635 } 2636 if (vap->iv_flags & IEEE80211_F_WME) { 2637 bo->bo_wme = frm; 2638 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2639 } 2640 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2641 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2642 frm = ieee80211_add_htcap_vendor(frm, ni); 2643 frm = ieee80211_add_htinfo_vendor(frm, ni); 2644 } 2645#ifdef IEEE80211_SUPPORT_SUPERG 2646 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2647 bo->bo_ath = frm; 2648 frm = ieee80211_add_athcaps(frm, ni); 2649 } 2650#endif 2651#ifdef IEEE80211_SUPPORT_TDMA 2652 if (vap->iv_caps & IEEE80211_C_TDMA) { 2653 bo->bo_tdma = frm; 2654 frm = ieee80211_add_tdma(frm, vap); 2655 } 2656#endif 2657 if (vap->iv_appie_beacon != NULL) { 2658 bo->bo_appie = frm; 2659 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2660 frm = add_appie(frm, vap->iv_appie_beacon); 2661 } 2662#ifdef IEEE80211_SUPPORT_MESH 2663 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2664 frm = ieee80211_add_meshid(frm, vap); 2665 bo->bo_meshconf = frm; 2666 frm = ieee80211_add_meshconf(frm, vap); 2667 } 2668#endif 2669 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2670 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2671 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2672} 2673 2674/* 2675 * Allocate a beacon frame and fillin the appropriate bits. 2676 */ 2677struct mbuf * 2678ieee80211_beacon_alloc(struct ieee80211_node *ni, 2679 struct ieee80211_beacon_offsets *bo) 2680{ 2681 struct ieee80211vap *vap = ni->ni_vap; 2682 struct ieee80211com *ic = ni->ni_ic; 2683 struct ifnet *ifp = vap->iv_ifp; 2684 struct ieee80211_frame *wh; 2685 struct mbuf *m; 2686 int pktlen; 2687 uint8_t *frm; 2688 2689 /* 2690 * beacon frame format 2691 * [8] time stamp 2692 * [2] beacon interval 2693 * [2] cabability information 2694 * [tlv] ssid 2695 * [tlv] supported rates 2696 * [3] parameter set (DS) 2697 * [8] CF parameter set (optional) 2698 * [tlv] parameter set (IBSS/TIM) 2699 * [tlv] country (optional) 2700 * [3] power control (optional) 2701 * [5] channel switch announcement (CSA) (optional) 2702 * [tlv] extended rate phy (ERP) 2703 * [tlv] extended supported rates 2704 * [tlv] RSN parameters 2705 * [tlv] HT capabilities 2706 * [tlv] HT information 2707 * [tlv] Vendor OUI HT capabilities (optional) 2708 * [tlv] Vendor OUI HT information (optional) 2709 * XXX Vendor-specific OIDs (e.g. Atheros) 2710 * [tlv] WPA parameters 2711 * [tlv] WME parameters 2712 * [tlv] TDMA parameters (optional) 2713 * [tlv] Mesh ID (MBSS) 2714 * [tlv] Mesh Conf (MBSS) 2715 * [tlv] application data (optional) 2716 * NB: we allocate the max space required for the TIM bitmap. 2717 * XXX how big is this? 2718 */ 2719 pktlen = 8 /* time stamp */ 2720 + sizeof(uint16_t) /* beacon interval */ 2721 + sizeof(uint16_t) /* capabilities */ 2722 + 2 + ni->ni_esslen /* ssid */ 2723 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2724 + 2 + 1 /* DS parameters */ 2725 + 2 + 6 /* CF parameters */ 2726 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2727 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2728 + 2 + 1 /* power control */ 2729 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2730 + 2 + 1 /* ERP */ 2731 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2732 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2733 2*sizeof(struct ieee80211_ie_wpa) : 0) 2734 /* XXX conditional? */ 2735 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2736 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2737 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2738 sizeof(struct ieee80211_wme_param) : 0) 2739#ifdef IEEE80211_SUPPORT_SUPERG 2740 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2741#endif 2742#ifdef IEEE80211_SUPPORT_TDMA 2743 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2744 sizeof(struct ieee80211_tdma_param) : 0) 2745#endif 2746#ifdef IEEE80211_SUPPORT_MESH 2747 + 2 + ni->ni_meshidlen 2748 + sizeof(struct ieee80211_meshconf_ie) 2749#endif 2750 + IEEE80211_MAX_APPIE 2751 ; 2752 m = ieee80211_getmgtframe(&frm, 2753 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2754 if (m == NULL) { 2755 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2756 "%s: cannot get buf; size %u\n", __func__, pktlen); 2757 vap->iv_stats.is_tx_nobuf++; 2758 return NULL; 2759 } 2760 ieee80211_beacon_construct(m, frm, bo, ni); 2761 2762 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2763 KASSERT(m != NULL, ("no space for 802.11 header?")); 2764 wh = mtod(m, struct ieee80211_frame *); 2765 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2766 IEEE80211_FC0_SUBTYPE_BEACON; 2767 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2768 *(uint16_t *)wh->i_dur = 0; 2769 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2770 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2771 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2772 *(uint16_t *)wh->i_seq = 0; 2773 2774 return m; 2775} 2776 2777/* 2778 * Update the dynamic parts of a beacon frame based on the current state. 2779 */ 2780int 2781ieee80211_beacon_update(struct ieee80211_node *ni, 2782 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2783{ 2784 struct ieee80211vap *vap = ni->ni_vap; 2785 struct ieee80211com *ic = ni->ni_ic; 2786 int len_changed = 0; 2787 uint16_t capinfo; 2788 2789 IEEE80211_LOCK(ic); 2790 /* 2791 * Handle 11h channel change when we've reached the count. 2792 * We must recalculate the beacon frame contents to account 2793 * for the new channel. Note we do this only for the first 2794 * vap that reaches this point; subsequent vaps just update 2795 * their beacon state to reflect the recalculated channel. 2796 */ 2797 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2798 vap->iv_csa_count == ic->ic_csa_count) { 2799 vap->iv_csa_count = 0; 2800 /* 2801 * Effect channel change before reconstructing the beacon 2802 * frame contents as many places reference ni_chan. 2803 */ 2804 if (ic->ic_csa_newchan != NULL) 2805 ieee80211_csa_completeswitch(ic); 2806 /* 2807 * NB: ieee80211_beacon_construct clears all pending 2808 * updates in bo_flags so we don't need to explicitly 2809 * clear IEEE80211_BEACON_CSA. 2810 */ 2811 ieee80211_beacon_construct(m, 2812 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2813 2814 /* XXX do WME aggressive mode processing? */ 2815 IEEE80211_UNLOCK(ic); 2816 return 1; /* just assume length changed */ 2817 } 2818 2819 /* XXX faster to recalculate entirely or just changes? */ 2820 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2821 *bo->bo_caps = htole16(capinfo); 2822 2823 if (vap->iv_flags & IEEE80211_F_WME) { 2824 struct ieee80211_wme_state *wme = &ic->ic_wme; 2825 2826 /* 2827 * Check for agressive mode change. When there is 2828 * significant high priority traffic in the BSS 2829 * throttle back BE traffic by using conservative 2830 * parameters. Otherwise BE uses agressive params 2831 * to optimize performance of legacy/non-QoS traffic. 2832 */ 2833 if (wme->wme_flags & WME_F_AGGRMODE) { 2834 if (wme->wme_hipri_traffic > 2835 wme->wme_hipri_switch_thresh) { 2836 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2837 "%s: traffic %u, disable aggressive mode\n", 2838 __func__, wme->wme_hipri_traffic); 2839 wme->wme_flags &= ~WME_F_AGGRMODE; 2840 ieee80211_wme_updateparams_locked(vap); 2841 wme->wme_hipri_traffic = 2842 wme->wme_hipri_switch_hysteresis; 2843 } else 2844 wme->wme_hipri_traffic = 0; 2845 } else { 2846 if (wme->wme_hipri_traffic <= 2847 wme->wme_hipri_switch_thresh) { 2848 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2849 "%s: traffic %u, enable aggressive mode\n", 2850 __func__, wme->wme_hipri_traffic); 2851 wme->wme_flags |= WME_F_AGGRMODE; 2852 ieee80211_wme_updateparams_locked(vap); 2853 wme->wme_hipri_traffic = 0; 2854 } else 2855 wme->wme_hipri_traffic = 2856 wme->wme_hipri_switch_hysteresis; 2857 } 2858 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2859 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2860 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2861 } 2862 } 2863 2864 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2865 ieee80211_ht_update_beacon(vap, bo); 2866 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2867 } 2868#ifdef IEEE80211_SUPPORT_TDMA 2869 if (vap->iv_caps & IEEE80211_C_TDMA) { 2870 /* 2871 * NB: the beacon is potentially updated every TBTT. 2872 */ 2873 ieee80211_tdma_update_beacon(vap, bo); 2874 } 2875#endif 2876#ifdef IEEE80211_SUPPORT_MESH 2877 if (vap->iv_opmode == IEEE80211_M_MBSS) 2878 ieee80211_mesh_update_beacon(vap, bo); 2879#endif 2880 2881 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2882 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2883 struct ieee80211_tim_ie *tie = 2884 (struct ieee80211_tim_ie *) bo->bo_tim; 2885 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2886 u_int timlen, timoff, i; 2887 /* 2888 * ATIM/DTIM needs updating. If it fits in the 2889 * current space allocated then just copy in the 2890 * new bits. Otherwise we need to move any trailing 2891 * data to make room. Note that we know there is 2892 * contiguous space because ieee80211_beacon_allocate 2893 * insures there is space in the mbuf to write a 2894 * maximal-size virtual bitmap (based on iv_max_aid). 2895 */ 2896 /* 2897 * Calculate the bitmap size and offset, copy any 2898 * trailer out of the way, and then copy in the 2899 * new bitmap and update the information element. 2900 * Note that the tim bitmap must contain at least 2901 * one byte and any offset must be even. 2902 */ 2903 if (vap->iv_ps_pending != 0) { 2904 timoff = 128; /* impossibly large */ 2905 for (i = 0; i < vap->iv_tim_len; i++) 2906 if (vap->iv_tim_bitmap[i]) { 2907 timoff = i &~ 1; 2908 break; 2909 } 2910 KASSERT(timoff != 128, ("tim bitmap empty!")); 2911 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2912 if (vap->iv_tim_bitmap[i]) 2913 break; 2914 timlen = 1 + (i - timoff); 2915 } else { 2916 timoff = 0; 2917 timlen = 1; 2918 } 2919 if (timlen != bo->bo_tim_len) { 2920 /* copy up/down trailer */ 2921 int adjust = tie->tim_bitmap+timlen 2922 - bo->bo_tim_trailer; 2923 ovbcopy(bo->bo_tim_trailer, 2924 bo->bo_tim_trailer+adjust, 2925 bo->bo_tim_trailer_len); 2926 bo->bo_tim_trailer += adjust; 2927 bo->bo_erp += adjust; 2928 bo->bo_htinfo += adjust; 2929#ifdef IEEE80211_SUPPORT_SUPERG 2930 bo->bo_ath += adjust; 2931#endif 2932#ifdef IEEE80211_SUPPORT_TDMA 2933 bo->bo_tdma += adjust; 2934#endif 2935#ifdef IEEE80211_SUPPORT_MESH 2936 bo->bo_meshconf += adjust; 2937#endif 2938 bo->bo_appie += adjust; 2939 bo->bo_wme += adjust; 2940 bo->bo_csa += adjust; 2941 bo->bo_tim_len = timlen; 2942 2943 /* update information element */ 2944 tie->tim_len = 3 + timlen; 2945 tie->tim_bitctl = timoff; 2946 len_changed = 1; 2947 } 2948 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2949 bo->bo_tim_len); 2950 2951 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2952 2953 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2954 "%s: TIM updated, pending %u, off %u, len %u\n", 2955 __func__, vap->iv_ps_pending, timoff, timlen); 2956 } 2957 /* count down DTIM period */ 2958 if (tie->tim_count == 0) 2959 tie->tim_count = tie->tim_period - 1; 2960 else 2961 tie->tim_count--; 2962 /* update state for buffered multicast frames on DTIM */ 2963 if (mcast && tie->tim_count == 0) 2964 tie->tim_bitctl |= 1; 2965 else 2966 tie->tim_bitctl &= ~1; 2967 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2968 struct ieee80211_csa_ie *csa = 2969 (struct ieee80211_csa_ie *) bo->bo_csa; 2970 2971 /* 2972 * Insert or update CSA ie. If we're just starting 2973 * to count down to the channel switch then we need 2974 * to insert the CSA ie. Otherwise we just need to 2975 * drop the count. The actual change happens above 2976 * when the vap's count reaches the target count. 2977 */ 2978 if (vap->iv_csa_count == 0) { 2979 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2980 bo->bo_erp += sizeof(*csa); 2981 bo->bo_htinfo += sizeof(*csa); 2982 bo->bo_wme += sizeof(*csa); 2983#ifdef IEEE80211_SUPPORT_SUPERG 2984 bo->bo_ath += sizeof(*csa); 2985#endif 2986#ifdef IEEE80211_SUPPORT_TDMA 2987 bo->bo_tdma += sizeof(*csa); 2988#endif 2989#ifdef IEEE80211_SUPPORT_MESH 2990 bo->bo_meshconf += sizeof(*csa); 2991#endif 2992 bo->bo_appie += sizeof(*csa); 2993 bo->bo_csa_trailer_len += sizeof(*csa); 2994 bo->bo_tim_trailer_len += sizeof(*csa); 2995 m->m_len += sizeof(*csa); 2996 m->m_pkthdr.len += sizeof(*csa); 2997 2998 ieee80211_add_csa(bo->bo_csa, vap); 2999 } else 3000 csa->csa_count--; 3001 vap->iv_csa_count++; 3002 /* NB: don't clear IEEE80211_BEACON_CSA */ 3003 } 3004 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3005 /* 3006 * ERP element needs updating. 3007 */ 3008 (void) ieee80211_add_erp(bo->bo_erp, ic); 3009 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3010 } 3011#ifdef IEEE80211_SUPPORT_SUPERG 3012 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3013 ieee80211_add_athcaps(bo->bo_ath, ni); 3014 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3015 } 3016#endif 3017 } 3018 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3019 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3020 int aielen; 3021 uint8_t *frm; 3022 3023 aielen = 0; 3024 if (aie != NULL) 3025 aielen += aie->ie_len; 3026 if (aielen != bo->bo_appie_len) { 3027 /* copy up/down trailer */ 3028 int adjust = aielen - bo->bo_appie_len; 3029 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3030 bo->bo_tim_trailer_len); 3031 bo->bo_tim_trailer += adjust; 3032 bo->bo_appie += adjust; 3033 bo->bo_appie_len = aielen; 3034 3035 len_changed = 1; 3036 } 3037 frm = bo->bo_appie; 3038 if (aie != NULL) 3039 frm = add_appie(frm, aie); 3040 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3041 } 3042 IEEE80211_UNLOCK(ic); 3043 3044 return len_changed; 3045} 3046