ieee80211_output.c revision 183247
191100Sdes/*- 2115619Sdes * Copyright (c) 2001 Atsushi Onoe 3228690Sdes * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 491100Sdes * All rights reserved. 591100Sdes * 691100Sdes * Redistribution and use in source and binary forms, with or without 799158Sdes * modification, are permitted provided that the following conditions 899158Sdes * are met: 999158Sdes * 1. Redistributions of source code must retain the above copyright 1091100Sdes * notice, this list of conditions and the following disclaimer. 1191100Sdes * 2. Redistributions in binary form must reproduce the above copyright 1291100Sdes * notice, this list of conditions and the following disclaimer in the 1391100Sdes * documentation and/or other materials provided with the distribution. 1491100Sdes * 1591100Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1691100Sdes * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1791100Sdes * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1891100Sdes * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1991100Sdes * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 2091100Sdes * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2191100Sdes * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2291100Sdes * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2391100Sdes * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2491100Sdes * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2591100Sdes */ 2691100Sdes 2791100Sdes#include <sys/cdefs.h> 2891100Sdes__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 183247 2008-09-21 23:00:19Z sam $"); 2991100Sdes 3091100Sdes#include "opt_inet.h" 3191100Sdes#include "opt_wlan.h" 3291100Sdes 3391100Sdes#include <sys/param.h> 3491100Sdes#include <sys/systm.h> 35255376Sdes#include <sys/mbuf.h> 3691100Sdes#include <sys/kernel.h> 3791100Sdes#include <sys/endian.h> 38228690Sdes 39228690Sdes#include <sys/socket.h> 40228690Sdes 41228690Sdes#include <net/bpf.h> 4291100Sdes#include <net/ethernet.h> 4391100Sdes#include <net/if.h> 4491100Sdes#include <net/if_llc.h> 4591100Sdes#include <net/if_media.h> 4691100Sdes#include <net/if_vlan_var.h> 4791100Sdes 4891100Sdes#include <net80211/ieee80211_var.h> 4991100Sdes#include <net80211/ieee80211_regdomain.h> 5091100Sdes#include <net80211/ieee80211_wds.h> 5191100Sdes 5291100Sdes#ifdef INET 5391100Sdes#include <netinet/in.h> 5491100Sdes#include <netinet/if_ether.h> 5591100Sdes#include <netinet/in_systm.h> 5691100Sdes#include <netinet/ip.h> 5791100Sdes#endif 5891100Sdes 5991100Sdes#define ETHER_HEADER_COPY(dst, src) \ 6091100Sdes memcpy(dst, src, sizeof(struct ether_header)) 6191100Sdes 6291100Sdesstatic struct mbuf *ieee80211_encap_fastframe(struct ieee80211vap *, 63107937Sdes struct mbuf *m1, const struct ether_header *eh1, 64107937Sdes struct mbuf *m2, const struct ether_header *eh2); 6591100Sdesstatic int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 6691100Sdes u_int hdrsize, u_int ciphdrsize, u_int mtu); 6791100Sdesstatic void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 6891100Sdes 6991100Sdes#ifdef IEEE80211_DEBUG 70/* 71 * Decide if an outbound management frame should be 72 * printed when debugging is enabled. This filters some 73 * of the less interesting frames that come frequently 74 * (e.g. beacons). 75 */ 76static __inline int 77doprint(struct ieee80211vap *vap, int subtype) 78{ 79 switch (subtype) { 80 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 81 return (vap->iv_opmode == IEEE80211_M_IBSS); 82 } 83 return 1; 84} 85#endif 86 87/* 88 * Start method for vap's. All packets from the stack come 89 * through here. We handle common processing of the packets 90 * before dispatching them to the underlying device. 91 */ 92void 93ieee80211_start(struct ifnet *ifp) 94{ 95#define IS_DWDS(vap) \ 96 (vap->iv_opmode == IEEE80211_M_WDS && \ 97 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 98 struct ieee80211vap *vap = ifp->if_softc; 99 struct ieee80211com *ic = vap->iv_ic; 100 struct ifnet *parent = ic->ic_ifp; 101 struct ieee80211_node *ni; 102 struct mbuf *m; 103 struct ether_header *eh; 104 int error; 105 106 /* NB: parent must be up and running */ 107 if (!IFNET_IS_UP_RUNNING(parent)) { 108 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 109 "%s: ignore queue, parent %s not up+running\n", 110 __func__, parent->if_xname); 111 /* XXX stat */ 112 return; 113 } 114 if (vap->iv_state == IEEE80211_S_SLEEP) { 115 /* 116 * In power save, wakeup device for transmit. 117 */ 118 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 119 return; 120 } 121 /* 122 * No data frames go out unless we're running. 123 * Note in particular this covers CAC and CSA 124 * states (though maybe we should check muting 125 * for CSA). 126 */ 127 if (vap->iv_state != IEEE80211_S_RUN) { 128 IEEE80211_LOCK(ic); 129 /* re-check under the com lock to avoid races */ 130 if (vap->iv_state != IEEE80211_S_RUN) { 131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 132 "%s: ignore queue, in %s state\n", 133 __func__, ieee80211_state_name[vap->iv_state]); 134 vap->iv_stats.is_tx_badstate++; 135 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 136 IEEE80211_UNLOCK(ic); 137 return; 138 } 139 IEEE80211_UNLOCK(ic); 140 } 141 for (;;) { 142 IFQ_DEQUEUE(&ifp->if_snd, m); 143 if (m == NULL) 144 break; 145 /* 146 * Sanitize mbuf flags for net80211 use. We cannot 147 * clear M_PWR_SAV because this may be set for frames 148 * that are re-submitted from the power save queue. 149 * 150 * NB: This must be done before ieee80211_classify as 151 * it marks EAPOL in frames with M_EAPOL. 152 */ 153 m->m_flags &= ~(M_80211_TX - M_PWR_SAV); 154 /* 155 * Cancel any background scan. 156 */ 157 if (ic->ic_flags & IEEE80211_F_SCAN) 158 ieee80211_cancel_anyscan(vap); 159 /* 160 * Find the node for the destination so we can do 161 * things like power save and fast frames aggregation. 162 * 163 * NB: past this point various code assumes the first 164 * mbuf has the 802.3 header present (and contiguous). 165 */ 166 ni = NULL; 167 if (m->m_len < sizeof(struct ether_header) && 168 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 169 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 170 "discard frame, %s\n", "m_pullup failed"); 171 vap->iv_stats.is_tx_nobuf++; /* XXX */ 172 ifp->if_oerrors++; 173 continue; 174 } 175 eh = mtod(m, struct ether_header *); 176 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 177 if (IS_DWDS(vap)) { 178 /* 179 * Only unicast frames from the above go out 180 * DWDS vaps; multicast frames are handled by 181 * dispatching the frame as it comes through 182 * the AP vap (see below). 183 */ 184 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 185 eh->ether_dhost, "mcast", "%s", "on DWDS"); 186 vap->iv_stats.is_dwds_mcast++; 187 m_freem(m); 188 continue; 189 } 190 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 191 /* 192 * Spam DWDS vap's w/ multicast traffic. 193 */ 194 /* XXX only if dwds in use? */ 195 ieee80211_dwds_mcast(vap, m); 196 } 197 } 198 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 199 if (ni == NULL) { 200 /* NB: ieee80211_find_txnode does stat+msg */ 201 ifp->if_oerrors++; 202 m_freem(m); 203 continue; 204 } 205 /* XXX AUTH'd */ 206 if (ni->ni_associd == 0) { 207 /* 208 * Destination is not associated; must special 209 * case DWDS where we point iv_bss at the node 210 * for the associated station. 211 * XXX adhoc mode? 212 */ 213 if (ni != vap->iv_bss || IS_DWDS(vap)) { 214 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 215 eh->ether_dhost, NULL, 216 "sta not associated (type 0x%04x)", 217 htons(eh->ether_type)); 218 vap->iv_stats.is_tx_notassoc++; 219 ifp->if_oerrors++; 220 m_freem(m); 221 ieee80211_free_node(ni); 222 continue; 223 } 224 } 225 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 226 (m->m_flags & M_PWR_SAV) == 0) { 227 /* 228 * Station in power save mode; pass the frame 229 * to the 802.11 layer and continue. We'll get 230 * the frame back when the time is right. 231 * XXX lose WDS vap linkage? 232 */ 233 ieee80211_pwrsave(ni, m); 234 ieee80211_free_node(ni); 235 continue; 236 } 237 /* calculate priority so drivers can find the tx queue */ 238 if (ieee80211_classify(ni, m)) { 239 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 240 eh->ether_dhost, NULL, 241 "%s", "classification failure"); 242 vap->iv_stats.is_tx_classify++; 243 ifp->if_oerrors++; 244 m_freem(m); 245 ieee80211_free_node(ni); 246 continue; 247 } 248 249 BPF_MTAP(ifp, m); /* 802.11 tx path */ 250 251 /* 252 * XXX When ni is associated with a WDS link then 253 * the vap will be the WDS vap but ni_vap will point 254 * to the ap vap the station associated to. Once 255 * we handoff the packet to the driver the callback 256 * to ieee80211_encap won't be able to tell if the 257 * packet should be encapsulated for WDS or not (e.g. 258 * multicast frames will not be handled correctly). 259 * We hack this by marking the mbuf so ieee80211_encap 260 * can do the right thing. 261 */ 262 if (vap->iv_opmode == IEEE80211_M_WDS) 263 m->m_flags |= M_WDS; 264 else 265 m->m_flags &= ~M_WDS; 266 267 /* 268 * Stash the node pointer and hand the frame off to 269 * the underlying device. Note that we do this after 270 * any call to ieee80211_dwds_mcast because that code 271 * uses any existing value for rcvif. 272 */ 273 m->m_pkthdr.rcvif = (void *)ni; 274 275 /* XXX defer if_start calls? */ 276 IFQ_HANDOFF(parent, m, error); 277 if (error != 0) { 278 /* NB: IFQ_HANDOFF reclaims mbuf */ 279 ieee80211_free_node(ni); 280 } else { 281 ifp->if_opackets++; 282 } 283 ic->ic_lastdata = ticks; 284 } 285#undef IS_DWDS 286} 287 288/* 289 * 802.11 output routine. This is (currently) used only to 290 * connect bpf write calls to the 802.11 layer for injecting 291 * raw 802.11 frames. Note we locate the ieee80211com from 292 * the ifnet using a spare field setup at attach time. This 293 * will go away when the virtual ap support comes in. 294 */ 295int 296ieee80211_output(struct ifnet *ifp, struct mbuf *m, 297 struct sockaddr *dst, struct rtentry *rt0) 298{ 299#define senderr(e) do { error = (e); goto bad;} while (0) 300 struct ieee80211_node *ni = NULL; 301 struct ieee80211vap *vap; 302 struct ieee80211_frame *wh; 303 int error; 304 305 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 306 /* 307 * Short-circuit requests if the vap is marked OACTIVE 308 * as this is used when tearing down state to indicate 309 * the vap may be gone. This can also happen because a 310 * packet came down through ieee80211_start before the 311 * vap entered RUN state in which case it's also ok to 312 * just drop the frame. This should not be necessary 313 * but callers of if_output don't check OACTIVE. 314 */ 315 senderr(ENETDOWN); 316 } 317 vap = ifp->if_softc; 318 /* 319 * Hand to the 802.3 code if not tagged as 320 * a raw 802.11 frame. 321 */ 322 if (dst->sa_family != AF_IEEE80211) 323 return vap->iv_output(ifp, m, dst, rt0); 324#ifdef MAC 325 error = mac_check_ifnet_transmit(ifp, m); 326 if (error) 327 senderr(error); 328#endif 329 if (ifp->if_flags & IFF_MONITOR) 330 senderr(ENETDOWN); 331 if (!IFNET_IS_UP_RUNNING(ifp)) 332 senderr(ENETDOWN); 333 if (vap->iv_state == IEEE80211_S_CAC) { 334 IEEE80211_DPRINTF(vap, 335 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 336 "block %s frame in CAC state\n", "raw data"); 337 vap->iv_stats.is_tx_badstate++; 338 senderr(EIO); /* XXX */ 339 } 340 /* XXX bypass bridge, pfil, carp, etc. */ 341 342 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 343 senderr(EIO); /* XXX */ 344 wh = mtod(m, struct ieee80211_frame *); 345 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 346 IEEE80211_FC0_VERSION_0) 347 senderr(EIO); /* XXX */ 348 349 /* locate destination node */ 350 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 351 case IEEE80211_FC1_DIR_NODS: 352 case IEEE80211_FC1_DIR_FROMDS: 353 ni = ieee80211_find_txnode(vap, wh->i_addr1); 354 break; 355 case IEEE80211_FC1_DIR_TODS: 356 case IEEE80211_FC1_DIR_DSTODS: 357 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 358 senderr(EIO); /* XXX */ 359 ni = ieee80211_find_txnode(vap, wh->i_addr3); 360 break; 361 default: 362 senderr(EIO); /* XXX */ 363 } 364 if (ni == NULL) { 365 /* 366 * Permit packets w/ bpf params through regardless 367 * (see below about sa_len). 368 */ 369 if (dst->sa_len == 0) 370 senderr(EHOSTUNREACH); 371 ni = ieee80211_ref_node(vap->iv_bss); 372 } 373 374 /* 375 * Sanitize mbuf for net80211 flags leaked from above. 376 * 377 * NB: This must be done before ieee80211_classify as 378 * it marks EAPOL in frames with M_EAPOL. 379 */ 380 m->m_flags &= ~M_80211_TX; 381 382 /* calculate priority so drivers can find the tx queue */ 383 /* XXX assumes an 802.3 frame */ 384 if (ieee80211_classify(ni, m)) 385 senderr(EIO); /* XXX */ 386 387 BPF_MTAP(ifp, m); 388 389 /* 390 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 391 * present by setting the sa_len field of the sockaddr (yes, 392 * this is a hack). 393 * NB: we assume sa_data is suitably aligned to cast. 394 */ 395 return vap->iv_ic->ic_raw_xmit(ni, m, 396 (const struct ieee80211_bpf_params *)(dst->sa_len ? 397 dst->sa_data : NULL)); 398bad: 399 if (m != NULL) 400 m_freem(m); 401 if (ni != NULL) 402 ieee80211_free_node(ni); 403 return error; 404#undef senderr 405} 406 407/* 408 * Set the direction field and address fields of an outgoing 409 * non-QoS frame. Note this should be called early on in 410 * constructing a frame as it sets i_fc[1]; other bits can 411 * then be or'd in. 412 */ 413static void 414ieee80211_send_setup( 415 struct ieee80211_node *ni, 416 struct ieee80211_frame *wh, 417 int type, 418 const uint8_t sa[IEEE80211_ADDR_LEN], 419 const uint8_t da[IEEE80211_ADDR_LEN], 420 const uint8_t bssid[IEEE80211_ADDR_LEN]) 421{ 422#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 423 424 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 425 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 426 struct ieee80211vap *vap = ni->ni_vap; 427 428 switch (vap->iv_opmode) { 429 case IEEE80211_M_STA: 430 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 431 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 432 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 433 IEEE80211_ADDR_COPY(wh->i_addr3, da); 434 break; 435 case IEEE80211_M_IBSS: 436 case IEEE80211_M_AHDEMO: 437 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 438 IEEE80211_ADDR_COPY(wh->i_addr1, da); 439 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 440 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 441 break; 442 case IEEE80211_M_HOSTAP: 443 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 444 IEEE80211_ADDR_COPY(wh->i_addr1, da); 445 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 446 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 447 break; 448 case IEEE80211_M_WDS: 449 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 450 IEEE80211_ADDR_COPY(wh->i_addr1, da); 451 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 452 IEEE80211_ADDR_COPY(wh->i_addr3, da); 453 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 454 break; 455 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 456 break; 457 } 458 } else { 459 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 460 IEEE80211_ADDR_COPY(wh->i_addr1, da); 461 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 462 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 463 } 464 *(uint16_t *)&wh->i_dur[0] = 0; 465 /* XXX probe response use per-vap seq#? */ 466 /* NB: use non-QoS tid */ 467 *(uint16_t *)&wh->i_seq[0] = 468 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 469 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 470#undef WH4 471} 472 473/* 474 * Send a management frame to the specified node. The node pointer 475 * must have a reference as the pointer will be passed to the driver 476 * and potentially held for a long time. If the frame is successfully 477 * dispatched to the driver, then it is responsible for freeing the 478 * reference (and potentially free'ing up any associated storage); 479 * otherwise deal with reclaiming any reference (on error). 480 */ 481int 482ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type) 483{ 484 struct ieee80211vap *vap = ni->ni_vap; 485 struct ieee80211com *ic = ni->ni_ic; 486 struct ieee80211_frame *wh; 487 488 KASSERT(ni != NULL, ("null node")); 489 490 if (vap->iv_state == IEEE80211_S_CAC) { 491 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 492 ni, "block %s frame in CAC state", 493 ieee80211_mgt_subtype_name[ 494 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 495 IEEE80211_FC0_SUBTYPE_SHIFT]); 496 vap->iv_stats.is_tx_badstate++; 497 ieee80211_free_node(ni); 498 m_freem(m); 499 return EIO; /* XXX */ 500 } 501 502 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 503 if (m == NULL) { 504 ieee80211_free_node(ni); 505 return ENOMEM; 506 } 507 508 wh = mtod(m, struct ieee80211_frame *); 509 ieee80211_send_setup(ni, wh, 510 IEEE80211_FC0_TYPE_MGT | type, 511 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 512 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 513 m->m_flags &= ~M_LINK0; 514 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 515 "encrypting frame (%s)", __func__); 516 wh->i_fc[1] |= IEEE80211_FC1_WEP; 517 } 518 if (type != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 519 /* NB: force non-ProbeResp frames to the highest queue */ 520 M_WME_SETAC(m, WME_AC_VO); 521 } else 522 M_WME_SETAC(m, WME_AC_BE); 523#ifdef IEEE80211_DEBUG 524 /* avoid printing too many frames */ 525 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 526 ieee80211_msg_dumppkts(vap)) { 527 printf("[%s] send %s on channel %u\n", 528 ether_sprintf(wh->i_addr1), 529 ieee80211_mgt_subtype_name[ 530 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 531 IEEE80211_FC0_SUBTYPE_SHIFT], 532 ieee80211_chan2ieee(ic, ic->ic_curchan)); 533 } 534#endif 535 IEEE80211_NODE_STAT(ni, tx_mgmt); 536 537 return ic->ic_raw_xmit(ni, m, NULL); 538} 539 540/* 541 * Send a null data frame to the specified node. 542 * 543 * NB: the caller is assumed to have setup a node reference 544 * for use; this is necessary to deal with a race condition 545 * when probing for inactive stations. Like ieee80211_mgmt_output 546 * we must cleanup any node reference on error; however we 547 * can safely just unref it as we know it will never be the 548 * last reference to the node. 549 */ 550int 551ieee80211_send_nulldata(struct ieee80211_node *ni) 552{ 553 struct ieee80211vap *vap = ni->ni_vap; 554 struct ieee80211com *ic = ni->ni_ic; 555 struct mbuf *m; 556 struct ieee80211_frame *wh; 557 558 if (vap->iv_state == IEEE80211_S_CAC) { 559 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 560 ni, "block %s frame in CAC state", "null data"); 561 ieee80211_unref_node(&ni); 562 vap->iv_stats.is_tx_badstate++; 563 return EIO; /* XXX */ 564 } 565 566 m = m_gethdr(M_NOWAIT, MT_HEADER); 567 if (m == NULL) { 568 /* XXX debug msg */ 569 ieee80211_unref_node(&ni); 570 vap->iv_stats.is_tx_nobuf++; 571 return ENOMEM; 572 } 573 MH_ALIGN(m, sizeof(struct ieee80211_frame)); 574 575 wh = mtod(m, struct ieee80211_frame *); 576 ieee80211_send_setup(ni, wh, 577 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 578 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 579 if (vap->iv_opmode != IEEE80211_M_WDS) { 580 /* NB: power management bit is never sent by an AP */ 581 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 582 vap->iv_opmode != IEEE80211_M_HOSTAP) 583 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 584 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 585 } else { 586 /* NB: 4-address frame */ 587 m->m_len = m->m_pkthdr.len = 588 sizeof(struct ieee80211_frame_addr4); 589 } 590 M_WME_SETAC(m, WME_AC_BE); 591 592 IEEE80211_NODE_STAT(ni, tx_data); 593 594 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 595 "send null data frame on channel %u, pwr mgt %s", 596 ieee80211_chan2ieee(ic, ic->ic_curchan), 597 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 598 599 return ic->ic_raw_xmit(ni, m, NULL); 600} 601 602/* 603 * Assign priority to a frame based on any vlan tag assigned 604 * to the station and/or any Diffserv setting in an IP header. 605 * Finally, if an ACM policy is setup (in station mode) it's 606 * applied. 607 */ 608int 609ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 610{ 611 const struct ether_header *eh = mtod(m, struct ether_header *); 612 int v_wme_ac, d_wme_ac, ac; 613 614 /* 615 * Always promote PAE/EAPOL frames to high priority. 616 */ 617 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 618 /* NB: mark so others don't need to check header */ 619 m->m_flags |= M_EAPOL; 620 ac = WME_AC_VO; 621 goto done; 622 } 623 /* 624 * Non-qos traffic goes to BE. 625 */ 626 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 627 ac = WME_AC_BE; 628 goto done; 629 } 630 631 /* 632 * If node has a vlan tag then all traffic 633 * to it must have a matching tag. 634 */ 635 v_wme_ac = 0; 636 if (ni->ni_vlan != 0) { 637 if ((m->m_flags & M_VLANTAG) == 0) { 638 IEEE80211_NODE_STAT(ni, tx_novlantag); 639 return 1; 640 } 641 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 642 EVL_VLANOFTAG(ni->ni_vlan)) { 643 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 644 return 1; 645 } 646 /* map vlan priority to AC */ 647 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 648 } 649 650#ifdef INET 651 if (eh->ether_type == htons(ETHERTYPE_IP)) { 652 uint8_t tos; 653 /* 654 * IP frame, map the DSCP bits from the TOS field. 655 */ 656 /* XXX m_copydata may be too slow for fast path */ 657 /* NB: ip header may not be in first mbuf */ 658 m_copydata(m, sizeof(struct ether_header) + 659 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 660 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 661 d_wme_ac = TID_TO_WME_AC(tos); 662 } else { 663#endif /* INET */ 664 d_wme_ac = WME_AC_BE; 665#ifdef INET 666 } 667#endif 668 /* 669 * Use highest priority AC. 670 */ 671 if (v_wme_ac > d_wme_ac) 672 ac = v_wme_ac; 673 else 674 ac = d_wme_ac; 675 676 /* 677 * Apply ACM policy. 678 */ 679 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 680 static const int acmap[4] = { 681 WME_AC_BK, /* WME_AC_BE */ 682 WME_AC_BK, /* WME_AC_BK */ 683 WME_AC_BE, /* WME_AC_VI */ 684 WME_AC_VI, /* WME_AC_VO */ 685 }; 686 struct ieee80211com *ic = ni->ni_ic; 687 688 while (ac != WME_AC_BK && 689 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 690 ac = acmap[ac]; 691 } 692done: 693 M_WME_SETAC(m, ac); 694 return 0; 695} 696 697/* 698 * Insure there is sufficient contiguous space to encapsulate the 699 * 802.11 data frame. If room isn't already there, arrange for it. 700 * Drivers and cipher modules assume we have done the necessary work 701 * and fail rudely if they don't find the space they need. 702 */ 703static struct mbuf * 704ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 705 struct ieee80211_key *key, struct mbuf *m) 706{ 707#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 708 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 709 710 if (key != NULL) { 711 /* XXX belongs in crypto code? */ 712 needed_space += key->wk_cipher->ic_header; 713 /* XXX frags */ 714 /* 715 * When crypto is being done in the host we must insure 716 * the data are writable for the cipher routines; clone 717 * a writable mbuf chain. 718 * XXX handle SWMIC specially 719 */ 720 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 721 m = m_unshare(m, M_NOWAIT); 722 if (m == NULL) { 723 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 724 "%s: cannot get writable mbuf\n", __func__); 725 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 726 return NULL; 727 } 728 } 729 } 730 /* 731 * We know we are called just before stripping an Ethernet 732 * header and prepending an LLC header. This means we know 733 * there will be 734 * sizeof(struct ether_header) - sizeof(struct llc) 735 * bytes recovered to which we need additional space for the 736 * 802.11 header and any crypto header. 737 */ 738 /* XXX check trailing space and copy instead? */ 739 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 740 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 741 if (n == NULL) { 742 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 743 "%s: cannot expand storage\n", __func__); 744 vap->iv_stats.is_tx_nobuf++; 745 m_freem(m); 746 return NULL; 747 } 748 KASSERT(needed_space <= MHLEN, 749 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 750 /* 751 * Setup new mbuf to have leading space to prepend the 752 * 802.11 header and any crypto header bits that are 753 * required (the latter are added when the driver calls 754 * back to ieee80211_crypto_encap to do crypto encapsulation). 755 */ 756 /* NB: must be first 'cuz it clobbers m_data */ 757 m_move_pkthdr(n, m); 758 n->m_len = 0; /* NB: m_gethdr does not set */ 759 n->m_data += needed_space; 760 /* 761 * Pull up Ethernet header to create the expected layout. 762 * We could use m_pullup but that's overkill (i.e. we don't 763 * need the actual data) and it cannot fail so do it inline 764 * for speed. 765 */ 766 /* NB: struct ether_header is known to be contiguous */ 767 n->m_len += sizeof(struct ether_header); 768 m->m_len -= sizeof(struct ether_header); 769 m->m_data += sizeof(struct ether_header); 770 /* 771 * Replace the head of the chain. 772 */ 773 n->m_next = m; 774 m = n; 775 } 776 return m; 777#undef TO_BE_RECLAIMED 778} 779 780/* 781 * Return the transmit key to use in sending a unicast frame. 782 * If a unicast key is set we use that. When no unicast key is set 783 * we fall back to the default transmit key. 784 */ 785static __inline struct ieee80211_key * 786ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 787 struct ieee80211_node *ni) 788{ 789 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 790 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 791 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 792 return NULL; 793 return &vap->iv_nw_keys[vap->iv_def_txkey]; 794 } else { 795 return &ni->ni_ucastkey; 796 } 797} 798 799/* 800 * Return the transmit key to use in sending a multicast frame. 801 * Multicast traffic always uses the group key which is installed as 802 * the default tx key. 803 */ 804static __inline struct ieee80211_key * 805ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 806 struct ieee80211_node *ni) 807{ 808 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 809 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 810 return NULL; 811 return &vap->iv_nw_keys[vap->iv_def_txkey]; 812} 813 814/* 815 * Encapsulate an outbound data frame. The mbuf chain is updated. 816 * If an error is encountered NULL is returned. The caller is required 817 * to provide a node reference and pullup the ethernet header in the 818 * first mbuf. 819 * 820 * NB: Packet is assumed to be processed by ieee80211_classify which 821 * marked EAPOL frames w/ M_EAPOL. 822 */ 823struct mbuf * 824ieee80211_encap(struct ieee80211_node *ni, struct mbuf *m) 825{ 826#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 827 struct ieee80211vap *vap = ni->ni_vap; 828 struct ieee80211com *ic = ni->ni_ic; 829 struct ether_header eh; 830 struct ieee80211_frame *wh; 831 struct ieee80211_key *key; 832 struct llc *llc; 833 int hdrsize, hdrspace, datalen, addqos, txfrag, isff, is4addr; 834 835 /* 836 * Copy existing Ethernet header to a safe place. The 837 * rest of the code assumes it's ok to strip it when 838 * reorganizing state for the final encapsulation. 839 */ 840 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 841 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 842 843 /* 844 * Insure space for additional headers. First identify 845 * transmit key to use in calculating any buffer adjustments 846 * required. This is also used below to do privacy 847 * encapsulation work. Then calculate the 802.11 header 848 * size and any padding required by the driver. 849 * 850 * Note key may be NULL if we fall back to the default 851 * transmit key and that is not set. In that case the 852 * buffer may not be expanded as needed by the cipher 853 * routines, but they will/should discard it. 854 */ 855 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 856 if (vap->iv_opmode == IEEE80211_M_STA || 857 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 858 (vap->iv_opmode == IEEE80211_M_WDS && 859 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 860 key = ieee80211_crypto_getucastkey(vap, ni); 861 else 862 key = ieee80211_crypto_getmcastkey(vap, ni); 863 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 864 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 865 eh.ether_dhost, 866 "no default transmit key (%s) deftxkey %u", 867 __func__, vap->iv_def_txkey); 868 vap->iv_stats.is_tx_nodefkey++; 869 goto bad; 870 } 871 } else 872 key = NULL; 873 /* 874 * XXX Some ap's don't handle QoS-encapsulated EAPOL 875 * frames so suppress use. This may be an issue if other 876 * ap's require all data frames to be QoS-encapsulated 877 * once negotiated in which case we'll need to make this 878 * configurable. 879 */ 880 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 881 (m->m_flags & M_EAPOL) == 0; 882 if (addqos) 883 hdrsize = sizeof(struct ieee80211_qosframe); 884 else 885 hdrsize = sizeof(struct ieee80211_frame); 886 /* 887 * 4-address frames need to be generated for: 888 * o packets sent through a WDS vap (M_WDS || IEEE80211_M_WDS) 889 * o packets relayed by a station operating with dynamic WDS 890 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 891 */ 892 is4addr = (m->m_flags & M_WDS) || 893 vap->iv_opmode == IEEE80211_M_WDS || /* XXX redundant? */ 894 (vap->iv_opmode == IEEE80211_M_STA && 895 (vap->iv_flags & IEEE80211_F_DWDS) && 896 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 897 if (is4addr) 898 hdrsize += IEEE80211_ADDR_LEN; 899 /* 900 * Honor driver DATAPAD requirement. 901 */ 902 if (ic->ic_flags & IEEE80211_F_DATAPAD) 903 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 904 else 905 hdrspace = hdrsize; 906 907 if ((isff = m->m_flags & M_FF) != 0) { 908 struct mbuf *m2; 909 struct ether_header eh2; 910 911 /* 912 * Fast frame encapsulation. There must be two packets 913 * chained with m_nextpkt. We do header adjustment for 914 * each, add the tunnel encapsulation, and then concatenate 915 * the mbuf chains to form a single frame for transmission. 916 */ 917 m2 = m->m_nextpkt; 918 if (m2 == NULL) { 919 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 920 "%s: only one frame\n", __func__); 921 goto bad; 922 } 923 m->m_nextpkt = NULL; 924 /* 925 * Include fast frame headers in adjusting header 926 * layout; this allocates space according to what 927 * ieee80211_encap_fastframe will do. 928 */ 929 m = ieee80211_mbuf_adjust(vap, 930 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 931 sizeof(struct ether_header), 932 key, m); 933 if (m == NULL) { 934 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 935 m_freem(m2); 936 goto bad; 937 } 938 /* 939 * Copy second frame's Ethernet header out of line 940 * and adjust for encapsulation headers. Note that 941 * we make room for padding in case there isn't room 942 * at the end of first frame. 943 */ 944 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 945 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 946 m2 = ieee80211_mbuf_adjust(vap, 947 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 948 NULL, m2); 949 if (m2 == NULL) { 950 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 951 goto bad; 952 } 953 m = ieee80211_encap_fastframe(vap, m, &eh, m2, &eh2); 954 if (m == NULL) 955 goto bad; 956 } else { 957 /* 958 * Normal frame. 959 */ 960 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 961 if (m == NULL) { 962 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 963 goto bad; 964 } 965 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 966 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 967 llc = mtod(m, struct llc *); 968 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 969 llc->llc_control = LLC_UI; 970 llc->llc_snap.org_code[0] = 0; 971 llc->llc_snap.org_code[1] = 0; 972 llc->llc_snap.org_code[2] = 0; 973 llc->llc_snap.ether_type = eh.ether_type; 974 } 975 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 976 977 M_PREPEND(m, hdrspace, M_DONTWAIT); 978 if (m == NULL) { 979 vap->iv_stats.is_tx_nobuf++; 980 goto bad; 981 } 982 wh = mtod(m, struct ieee80211_frame *); 983 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 984 *(uint16_t *)wh->i_dur = 0; 985 if (is4addr) { 986 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 987 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 988 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 989 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 990 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 991 } else switch (vap->iv_opmode) { 992 case IEEE80211_M_STA: 993 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 994 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 995 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 996 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 997 break; 998 case IEEE80211_M_IBSS: 999 case IEEE80211_M_AHDEMO: 1000 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1001 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1002 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1003 /* 1004 * NB: always use the bssid from iv_bss as the 1005 * neighbor's may be stale after an ibss merge 1006 */ 1007 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1008 break; 1009 case IEEE80211_M_HOSTAP: 1010 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1011 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1012 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1013 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1014 break; 1015 case IEEE80211_M_MONITOR: 1016 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1017 goto bad; 1018 } 1019 if (m->m_flags & M_MORE_DATA) 1020 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1021 if (addqos) { 1022 uint8_t *qos; 1023 int ac, tid; 1024 1025 if (is4addr) { 1026 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1027 } else 1028 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1029 ac = M_WME_GETAC(m); 1030 /* map from access class/queue to 11e header priorty value */ 1031 tid = WME_AC_TO_TID(ac); 1032 qos[0] = tid & IEEE80211_QOS_TID; 1033 /* 1034 * Check if A-MPDU tx aggregation is setup or if we 1035 * should try to enable it. The sta must be associated 1036 * with HT and A-MPDU enabled for use. When the policy 1037 * routine decides we should enable A-MPDU we issue an 1038 * ADDBA request and wait for a reply. The frame being 1039 * encapsulated will go out w/o using A-MPDU, or possibly 1040 * it might be collected by the driver and held/retransmit. 1041 * The default ic_ampdu_enable routine handles staggering 1042 * ADDBA requests in case the receiver NAK's us or we are 1043 * otherwise unable to establish a BA stream. 1044 */ 1045 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1046 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1047 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1048 1049 ieee80211_txampdu_count_packet(tap); 1050 if (IEEE80211_AMPDU_RUNNING(tap)) { 1051 /* 1052 * Operational, mark frame for aggregation. 1053 * 1054 * NB: We support only immediate BA's for 1055 * AMPDU which means we set the QoS control 1056 * field to "normal ack" (0) to get "implicit 1057 * block ack" behaviour. 1058 */ 1059 m->m_flags |= M_AMPDU_MPDU; 1060 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1061 ic->ic_ampdu_enable(ni, tap)) { 1062 /* 1063 * Not negotiated yet, request service. 1064 */ 1065 ieee80211_ampdu_request(ni, tap); 1066 } 1067 } 1068 /* XXX works even when BA marked above */ 1069 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1070 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1071 qos[1] = 0; 1072 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1073 1074 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1075 /* 1076 * NB: don't assign a sequence # to potential 1077 * aggregates; we expect this happens at the 1078 * point the frame comes off any aggregation q 1079 * as otherwise we may introduce holes in the 1080 * BA sequence space and/or make window accouting 1081 * more difficult. 1082 * 1083 * XXX may want to control this with a driver 1084 * capability; this may also change when we pull 1085 * aggregation up into net80211 1086 */ 1087 *(uint16_t *)wh->i_seq = 1088 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1089 ni->ni_txseqs[tid]++; 1090 } 1091 ni->ni_txseqs[tid]++; 1092 } else { 1093 *(uint16_t *)wh->i_seq = 1094 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1095 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1096 } 1097 /* check if xmit fragmentation is required */ 1098 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1099 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1100 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1101 !isff); /* NB: don't fragment ff's */ 1102 if (key != NULL) { 1103 /* 1104 * IEEE 802.1X: send EAPOL frames always in the clear. 1105 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1106 */ 1107 if ((m->m_flags & M_EAPOL) == 0 || 1108 ((vap->iv_flags & IEEE80211_F_WPA) && 1109 (vap->iv_opmode == IEEE80211_M_STA ? 1110 !IEEE80211_KEY_UNDEFINED(key) : 1111 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1112 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1113 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1114 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1115 eh.ether_dhost, 1116 "%s", "enmic failed, discard frame"); 1117 vap->iv_stats.is_crypto_enmicfail++; 1118 goto bad; 1119 } 1120 } 1121 } 1122 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1123 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1124 goto bad; 1125 1126 IEEE80211_NODE_STAT(ni, tx_data); 1127 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1128 IEEE80211_NODE_STAT(ni, tx_mcast); 1129 else 1130 IEEE80211_NODE_STAT(ni, tx_ucast); 1131 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1132 1133 /* XXX fragmented frames not handled */ 1134 if (bpf_peers_present(vap->iv_rawbpf)) 1135 bpf_mtap(vap->iv_rawbpf, m); 1136 1137 return m; 1138bad: 1139 if (m != NULL) 1140 m_freem(m); 1141 return NULL; 1142#undef WH4 1143} 1144 1145/* 1146 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1147 * tunnel encapsulation. The frame is assumed to have an Ethernet 1148 * header at the front that must be stripped before prepending the 1149 * LLC followed by the Ethernet header passed in (with an Ethernet 1150 * type that specifies the payload size). 1151 */ 1152static struct mbuf * 1153ieee80211_encap1(struct ieee80211vap *vap, struct mbuf *m, 1154 const struct ether_header *eh) 1155{ 1156 struct llc *llc; 1157 uint16_t payload; 1158 1159 /* XXX optimize by combining m_adj+M_PREPEND */ 1160 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1161 llc = mtod(m, struct llc *); 1162 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1163 llc->llc_control = LLC_UI; 1164 llc->llc_snap.org_code[0] = 0; 1165 llc->llc_snap.org_code[1] = 0; 1166 llc->llc_snap.org_code[2] = 0; 1167 llc->llc_snap.ether_type = eh->ether_type; 1168 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1169 1170 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1171 if (m == NULL) { /* XXX cannot happen */ 1172 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1173 "%s: no space for ether_header\n", __func__); 1174 vap->iv_stats.is_tx_nobuf++; 1175 return NULL; 1176 } 1177 ETHER_HEADER_COPY(mtod(m, void *), eh); 1178 mtod(m, struct ether_header *)->ether_type = htons(payload); 1179 return m; 1180} 1181 1182/* 1183 * Do fast frame tunnel encapsulation. The two frames and 1184 * Ethernet headers are supplied. The caller is assumed to 1185 * have arrange for space in the mbuf chains for encapsulating 1186 * headers (to avoid major mbuf fragmentation). 1187 * 1188 * The encapsulated frame is returned or NULL if there is a 1189 * problem (should not happen). 1190 */ 1191static struct mbuf * 1192ieee80211_encap_fastframe(struct ieee80211vap *vap, 1193 struct mbuf *m1, const struct ether_header *eh1, 1194 struct mbuf *m2, const struct ether_header *eh2) 1195{ 1196 struct llc *llc; 1197 struct mbuf *m; 1198 int pad; 1199 1200 /* 1201 * First, each frame gets a standard encapsulation. 1202 */ 1203 m1 = ieee80211_encap1(vap, m1, eh1); 1204 if (m1 == NULL) { 1205 m_freem(m2); 1206 return NULL; 1207 } 1208 m2 = ieee80211_encap1(vap, m2, eh2); 1209 if (m2 == NULL) { 1210 m_freem(m1); 1211 return NULL; 1212 } 1213 1214 /* 1215 * Pad leading frame to a 4-byte boundary. If there 1216 * is space at the end of the first frame, put it 1217 * there; otherwise prepend to the front of the second 1218 * frame. We know doing the second will always work 1219 * because we reserve space above. We prefer appending 1220 * as this typically has better DMA alignment properties. 1221 */ 1222 for (m = m1; m->m_next != NULL; m = m->m_next) 1223 ; 1224 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1225 if (pad) { 1226 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1227 m2->m_data -= pad; 1228 m2->m_len += pad; 1229 m2->m_pkthdr.len += pad; 1230 } else { /* append to first */ 1231 m->m_len += pad; 1232 m1->m_pkthdr.len += pad; 1233 } 1234 } 1235 1236 /* 1237 * Now, stick 'em together and prepend the tunnel headers; 1238 * first the Atheros tunnel header (all zero for now) and 1239 * then a special fast frame LLC. 1240 * 1241 * XXX optimize by prepending together 1242 */ 1243 m->m_next = m2; /* NB: last mbuf from above */ 1244 m1->m_pkthdr.len += m2->m_pkthdr.len; 1245 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1246 if (m1 == NULL) { /* XXX cannot happen */ 1247 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1248 "%s: no space for tunnel header\n", __func__); 1249 vap->iv_stats.is_tx_nobuf++; 1250 return NULL; 1251 } 1252 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1253 1254 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1255 if (m1 == NULL) { /* XXX cannot happen */ 1256 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1257 "%s: no space for llc header\n", __func__); 1258 vap->iv_stats.is_tx_nobuf++; 1259 return NULL; 1260 } 1261 llc = mtod(m1, struct llc *); 1262 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1263 llc->llc_control = LLC_UI; 1264 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1265 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1266 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1267 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1268 1269 vap->iv_stats.is_ff_encap++; 1270 1271 return m1; 1272} 1273 1274/* 1275 * Fragment the frame according to the specified mtu. 1276 * The size of the 802.11 header (w/o padding) is provided 1277 * so we don't need to recalculate it. We create a new 1278 * mbuf for each fragment and chain it through m_nextpkt; 1279 * we might be able to optimize this by reusing the original 1280 * packet's mbufs but that is significantly more complicated. 1281 */ 1282static int 1283ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1284 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1285{ 1286 struct ieee80211_frame *wh, *whf; 1287 struct mbuf *m, *prev, *next; 1288 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1289 1290 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1291 KASSERT(m0->m_pkthdr.len > mtu, 1292 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1293 1294 wh = mtod(m0, struct ieee80211_frame *); 1295 /* NB: mark the first frag; it will be propagated below */ 1296 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1297 totalhdrsize = hdrsize + ciphdrsize; 1298 fragno = 1; 1299 off = mtu - ciphdrsize; 1300 remainder = m0->m_pkthdr.len - off; 1301 prev = m0; 1302 do { 1303 fragsize = totalhdrsize + remainder; 1304 if (fragsize > mtu) 1305 fragsize = mtu; 1306 /* XXX fragsize can be >2048! */ 1307 KASSERT(fragsize < MCLBYTES, 1308 ("fragment size %u too big!", fragsize)); 1309 if (fragsize > MHLEN) 1310 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1311 else 1312 m = m_gethdr(M_DONTWAIT, MT_DATA); 1313 if (m == NULL) 1314 goto bad; 1315 /* leave room to prepend any cipher header */ 1316 m_align(m, fragsize - ciphdrsize); 1317 1318 /* 1319 * Form the header in the fragment. Note that since 1320 * we mark the first fragment with the MORE_FRAG bit 1321 * it automatically is propagated to each fragment; we 1322 * need only clear it on the last fragment (done below). 1323 */ 1324 whf = mtod(m, struct ieee80211_frame *); 1325 memcpy(whf, wh, hdrsize); 1326 *(uint16_t *)&whf->i_seq[0] |= htole16( 1327 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1328 IEEE80211_SEQ_FRAG_SHIFT); 1329 fragno++; 1330 1331 payload = fragsize - totalhdrsize; 1332 /* NB: destination is known to be contiguous */ 1333 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1334 m->m_len = hdrsize + payload; 1335 m->m_pkthdr.len = hdrsize + payload; 1336 m->m_flags |= M_FRAG; 1337 1338 /* chain up the fragment */ 1339 prev->m_nextpkt = m; 1340 prev = m; 1341 1342 /* deduct fragment just formed */ 1343 remainder -= payload; 1344 off += payload; 1345 } while (remainder != 0); 1346 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1347 1348 /* strip first mbuf now that everything has been copied */ 1349 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1350 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1351 1352 vap->iv_stats.is_tx_fragframes++; 1353 vap->iv_stats.is_tx_frags += fragno-1; 1354 1355 return 1; 1356bad: 1357 /* reclaim fragments but leave original frame for caller to free */ 1358 for (m = m0->m_nextpkt; m != NULL; m = next) { 1359 next = m->m_nextpkt; 1360 m->m_nextpkt = NULL; /* XXX paranoid */ 1361 m_freem(m); 1362 } 1363 m0->m_nextpkt = NULL; 1364 return 0; 1365} 1366 1367/* 1368 * Add a supported rates element id to a frame. 1369 */ 1370static uint8_t * 1371ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1372{ 1373 int nrates; 1374 1375 *frm++ = IEEE80211_ELEMID_RATES; 1376 nrates = rs->rs_nrates; 1377 if (nrates > IEEE80211_RATE_SIZE) 1378 nrates = IEEE80211_RATE_SIZE; 1379 *frm++ = nrates; 1380 memcpy(frm, rs->rs_rates, nrates); 1381 return frm + nrates; 1382} 1383 1384/* 1385 * Add an extended supported rates element id to a frame. 1386 */ 1387static uint8_t * 1388ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1389{ 1390 /* 1391 * Add an extended supported rates element if operating in 11g mode. 1392 */ 1393 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1394 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1395 *frm++ = IEEE80211_ELEMID_XRATES; 1396 *frm++ = nrates; 1397 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1398 frm += nrates; 1399 } 1400 return frm; 1401} 1402 1403/* 1404 * Add an ssid element to a frame. 1405 */ 1406static uint8_t * 1407ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1408{ 1409 *frm++ = IEEE80211_ELEMID_SSID; 1410 *frm++ = len; 1411 memcpy(frm, ssid, len); 1412 return frm + len; 1413} 1414 1415/* 1416 * Add an erp element to a frame. 1417 */ 1418static uint8_t * 1419ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1420{ 1421 uint8_t erp; 1422 1423 *frm++ = IEEE80211_ELEMID_ERP; 1424 *frm++ = 1; 1425 erp = 0; 1426 if (ic->ic_nonerpsta != 0) 1427 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1428 if (ic->ic_flags & IEEE80211_F_USEPROT) 1429 erp |= IEEE80211_ERP_USE_PROTECTION; 1430 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1431 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1432 *frm++ = erp; 1433 return frm; 1434} 1435 1436/* 1437 * Add a CFParams element to a frame. 1438 */ 1439static uint8_t * 1440ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1441{ 1442#define ADDSHORT(frm, v) do { \ 1443 frm[0] = (v) & 0xff; \ 1444 frm[1] = (v) >> 8; \ 1445 frm += 2; \ 1446} while (0) 1447 *frm++ = IEEE80211_ELEMID_CFPARMS; 1448 *frm++ = 6; 1449 *frm++ = 0; /* CFP count */ 1450 *frm++ = 2; /* CFP period */ 1451 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1452 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1453 return frm; 1454#undef ADDSHORT 1455} 1456 1457static __inline uint8_t * 1458add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1459{ 1460 memcpy(frm, ie->ie_data, ie->ie_len); 1461 return frm + ie->ie_len; 1462} 1463 1464static __inline uint8_t * 1465add_ie(uint8_t *frm, const uint8_t *ie) 1466{ 1467 memcpy(frm, ie, 2 + ie[1]); 1468 return frm + 2 + ie[1]; 1469} 1470 1471#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1472/* 1473 * Add a WME information element to a frame. 1474 */ 1475static uint8_t * 1476ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1477{ 1478 static const struct ieee80211_wme_info info = { 1479 .wme_id = IEEE80211_ELEMID_VENDOR, 1480 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1481 .wme_oui = { WME_OUI_BYTES }, 1482 .wme_type = WME_OUI_TYPE, 1483 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1484 .wme_version = WME_VERSION, 1485 .wme_info = 0, 1486 }; 1487 memcpy(frm, &info, sizeof(info)); 1488 return frm + sizeof(info); 1489} 1490 1491/* 1492 * Add a WME parameters element to a frame. 1493 */ 1494static uint8_t * 1495ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1496{ 1497#define SM(_v, _f) (((_v) << _f##_S) & _f) 1498#define ADDSHORT(frm, v) do { \ 1499 frm[0] = (v) & 0xff; \ 1500 frm[1] = (v) >> 8; \ 1501 frm += 2; \ 1502} while (0) 1503 /* NB: this works 'cuz a param has an info at the front */ 1504 static const struct ieee80211_wme_info param = { 1505 .wme_id = IEEE80211_ELEMID_VENDOR, 1506 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1507 .wme_oui = { WME_OUI_BYTES }, 1508 .wme_type = WME_OUI_TYPE, 1509 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1510 .wme_version = WME_VERSION, 1511 }; 1512 int i; 1513 1514 memcpy(frm, ¶m, sizeof(param)); 1515 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1516 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1517 *frm++ = 0; /* reserved field */ 1518 for (i = 0; i < WME_NUM_AC; i++) { 1519 const struct wmeParams *ac = 1520 &wme->wme_bssChanParams.cap_wmeParams[i]; 1521 *frm++ = SM(i, WME_PARAM_ACI) 1522 | SM(ac->wmep_acm, WME_PARAM_ACM) 1523 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1524 ; 1525 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1526 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1527 ; 1528 ADDSHORT(frm, ac->wmep_txopLimit); 1529 } 1530 return frm; 1531#undef SM 1532#undef ADDSHORT 1533} 1534#undef WME_OUI_BYTES 1535 1536#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1537/* 1538 * Add a WME information element to a frame. 1539 */ 1540static uint8_t * 1541ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1542{ 1543 static const struct ieee80211_ath_ie info = { 1544 .ath_id = IEEE80211_ELEMID_VENDOR, 1545 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1546 .ath_oui = { ATH_OUI_BYTES }, 1547 .ath_oui_type = ATH_OUI_TYPE, 1548 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1549 .ath_version = ATH_OUI_VERSION, 1550 }; 1551 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1552 1553 memcpy(frm, &info, sizeof(info)); 1554 ath->ath_capability = caps; 1555 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1556 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1557 return frm + sizeof(info); 1558} 1559#undef ATH_OUI_BYTES 1560 1561/* 1562 * Add an 11h Power Constraint element to a frame. 1563 */ 1564static uint8_t * 1565ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1566{ 1567 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1568 /* XXX per-vap tx power limit? */ 1569 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1570 1571 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1572 frm[1] = 1; 1573 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1574 return frm + 3; 1575} 1576 1577/* 1578 * Add an 11h Power Capability element to a frame. 1579 */ 1580static uint8_t * 1581ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1582{ 1583 frm[0] = IEEE80211_ELEMID_PWRCAP; 1584 frm[1] = 2; 1585 frm[2] = c->ic_minpower; 1586 frm[3] = c->ic_maxpower; 1587 return frm + 4; 1588} 1589 1590/* 1591 * Add an 11h Supported Channels element to a frame. 1592 */ 1593static uint8_t * 1594ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1595{ 1596 static const int ielen = 26; 1597 1598 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1599 frm[1] = ielen; 1600 /* XXX not correct */ 1601 memcpy(frm+2, ic->ic_chan_avail, ielen); 1602 return frm + 2 + ielen; 1603} 1604 1605/* 1606 * Add an 11h Channel Switch Announcement element to a frame. 1607 * Note that we use the per-vap CSA count to adjust the global 1608 * counter so we can use this routine to form probe response 1609 * frames and get the current count. 1610 */ 1611static uint8_t * 1612ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1613{ 1614 struct ieee80211com *ic = vap->iv_ic; 1615 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1616 1617 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1618 csa->csa_len = 3; 1619 csa->csa_mode = 1; /* XXX force quiet on channel */ 1620 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1621 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1622 return frm + sizeof(*csa); 1623} 1624 1625/* 1626 * Add an 11h country information element to a frame. 1627 */ 1628static uint8_t * 1629ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1630{ 1631 1632 if (ic->ic_countryie == NULL || 1633 ic->ic_countryie_chan != ic->ic_bsschan) { 1634 /* 1635 * Handle lazy construction of ie. This is done on 1636 * first use and after a channel change that requires 1637 * re-calculation. 1638 */ 1639 if (ic->ic_countryie != NULL) 1640 free(ic->ic_countryie, M_80211_NODE_IE); 1641 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1642 if (ic->ic_countryie == NULL) 1643 return frm; 1644 ic->ic_countryie_chan = ic->ic_bsschan; 1645 } 1646 return add_appie(frm, ic->ic_countryie); 1647} 1648 1649/* 1650 * Send a probe request frame with the specified ssid 1651 * and any optional information element data. 1652 */ 1653int 1654ieee80211_send_probereq(struct ieee80211_node *ni, 1655 const uint8_t sa[IEEE80211_ADDR_LEN], 1656 const uint8_t da[IEEE80211_ADDR_LEN], 1657 const uint8_t bssid[IEEE80211_ADDR_LEN], 1658 const uint8_t *ssid, size_t ssidlen) 1659{ 1660 struct ieee80211vap *vap = ni->ni_vap; 1661 struct ieee80211com *ic = ni->ni_ic; 1662 struct ieee80211_frame *wh; 1663 const struct ieee80211_rateset *rs; 1664 struct mbuf *m; 1665 uint8_t *frm; 1666 1667 if (vap->iv_state == IEEE80211_S_CAC) { 1668 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1669 "block %s frame in CAC state", "probe request"); 1670 vap->iv_stats.is_tx_badstate++; 1671 return EIO; /* XXX */ 1672 } 1673 1674 /* 1675 * Hold a reference on the node so it doesn't go away until after 1676 * the xmit is complete all the way in the driver. On error we 1677 * will remove our reference. 1678 */ 1679 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1680 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1681 __func__, __LINE__, 1682 ni, ether_sprintf(ni->ni_macaddr), 1683 ieee80211_node_refcnt(ni)+1); 1684 ieee80211_ref_node(ni); 1685 1686 /* 1687 * prreq frame format 1688 * [tlv] ssid 1689 * [tlv] supported rates 1690 * [tlv] RSN (optional) 1691 * [tlv] extended supported rates 1692 * [tlv] WPA (optional) 1693 * [tlv] user-specified ie's 1694 */ 1695 m = ieee80211_getmgtframe(&frm, 1696 ic->ic_headroom + sizeof(struct ieee80211_frame), 1697 2 + IEEE80211_NWID_LEN 1698 + 2 + IEEE80211_RATE_SIZE 1699 + sizeof(struct ieee80211_ie_wpa) 1700 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1701 + sizeof(struct ieee80211_ie_wpa) 1702 + (vap->iv_appie_probereq != NULL ? 1703 vap->iv_appie_probereq->ie_len : 0) 1704 ); 1705 if (m == NULL) { 1706 vap->iv_stats.is_tx_nobuf++; 1707 ieee80211_free_node(ni); 1708 return ENOMEM; 1709 } 1710 1711 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1712 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1713 frm = ieee80211_add_rates(frm, rs); 1714 if (vap->iv_flags & IEEE80211_F_WPA2) { 1715 if (vap->iv_rsn_ie != NULL) 1716 frm = add_ie(frm, vap->iv_rsn_ie); 1717 /* XXX else complain? */ 1718 } 1719 frm = ieee80211_add_xrates(frm, rs); 1720 if (vap->iv_flags & IEEE80211_F_WPA1) { 1721 if (vap->iv_wpa_ie != NULL) 1722 frm = add_ie(frm, vap->iv_wpa_ie); 1723 /* XXX else complain? */ 1724 } 1725 if (vap->iv_appie_probereq != NULL) 1726 frm = add_appie(frm, vap->iv_appie_probereq); 1727 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1728 1729 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1730 if (m == NULL) 1731 return ENOMEM; 1732 1733 wh = mtod(m, struct ieee80211_frame *); 1734 ieee80211_send_setup(ni, wh, 1735 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1736 sa, da, bssid); 1737 /* XXX power management? */ 1738 1739 M_WME_SETAC(m, WME_AC_BE); 1740 1741 IEEE80211_NODE_STAT(ni, tx_probereq); 1742 IEEE80211_NODE_STAT(ni, tx_mgmt); 1743 1744 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1745 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1746 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1747 ssidlen, ssid); 1748 1749 return ic->ic_raw_xmit(ni, m, NULL); 1750} 1751 1752/* 1753 * Calculate capability information for mgt frames. 1754 */ 1755static uint16_t 1756getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1757{ 1758 struct ieee80211com *ic = vap->iv_ic; 1759 uint16_t capinfo; 1760 1761 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1762 1763 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1764 capinfo = IEEE80211_CAPINFO_ESS; 1765 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1766 capinfo = IEEE80211_CAPINFO_IBSS; 1767 else 1768 capinfo = 0; 1769 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1770 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1771 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1772 IEEE80211_IS_CHAN_2GHZ(chan)) 1773 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1774 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1775 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1776 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1777 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1778 return capinfo; 1779} 1780 1781/* 1782 * Send a management frame. The node is for the destination (or ic_bss 1783 * when in station mode). Nodes other than ic_bss have their reference 1784 * count bumped to reflect our use for an indeterminant time. 1785 */ 1786int 1787ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1788{ 1789#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1790#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1791 struct ieee80211vap *vap = ni->ni_vap; 1792 struct ieee80211com *ic = ni->ni_ic; 1793 struct ieee80211_node *bss = vap->iv_bss; 1794 struct mbuf *m; 1795 uint8_t *frm; 1796 uint16_t capinfo; 1797 int has_challenge, is_shared_key, ret, status; 1798 1799 KASSERT(ni != NULL, ("null node")); 1800 1801 /* 1802 * Hold a reference on the node so it doesn't go away until after 1803 * the xmit is complete all the way in the driver. On error we 1804 * will remove our reference. 1805 */ 1806 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1807 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1808 __func__, __LINE__, 1809 ni, ether_sprintf(ni->ni_macaddr), 1810 ieee80211_node_refcnt(ni)+1); 1811 ieee80211_ref_node(ni); 1812 1813 switch (type) { 1814 1815 case IEEE80211_FC0_SUBTYPE_AUTH: 1816 status = arg >> 16; 1817 arg &= 0xffff; 1818 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1819 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1820 ni->ni_challenge != NULL); 1821 1822 /* 1823 * Deduce whether we're doing open authentication or 1824 * shared key authentication. We do the latter if 1825 * we're in the middle of a shared key authentication 1826 * handshake or if we're initiating an authentication 1827 * request and configured to use shared key. 1828 */ 1829 is_shared_key = has_challenge || 1830 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1831 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1832 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1833 1834 m = ieee80211_getmgtframe(&frm, 1835 ic->ic_headroom + sizeof(struct ieee80211_frame), 1836 3 * sizeof(uint16_t) 1837 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1838 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1839 ); 1840 if (m == NULL) 1841 senderr(ENOMEM, is_tx_nobuf); 1842 1843 ((uint16_t *)frm)[0] = 1844 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1845 : htole16(IEEE80211_AUTH_ALG_OPEN); 1846 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1847 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1848 1849 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1850 ((uint16_t *)frm)[3] = 1851 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1852 IEEE80211_ELEMID_CHALLENGE); 1853 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1854 IEEE80211_CHALLENGE_LEN); 1855 m->m_pkthdr.len = m->m_len = 1856 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1857 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1858 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1859 "request encrypt frame (%s)", __func__); 1860 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1861 } 1862 } else 1863 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1864 1865 /* XXX not right for shared key */ 1866 if (status == IEEE80211_STATUS_SUCCESS) 1867 IEEE80211_NODE_STAT(ni, tx_auth); 1868 else 1869 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1870 1871 if (vap->iv_opmode == IEEE80211_M_STA) 1872 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1873 (void *) vap->iv_state); 1874 break; 1875 1876 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1877 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1878 "send station deauthenticate (reason %d)", arg); 1879 m = ieee80211_getmgtframe(&frm, 1880 ic->ic_headroom + sizeof(struct ieee80211_frame), 1881 sizeof(uint16_t)); 1882 if (m == NULL) 1883 senderr(ENOMEM, is_tx_nobuf); 1884 *(uint16_t *)frm = htole16(arg); /* reason */ 1885 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1886 1887 IEEE80211_NODE_STAT(ni, tx_deauth); 1888 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1889 1890 ieee80211_node_unauthorize(ni); /* port closed */ 1891 break; 1892 1893 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1894 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1895 /* 1896 * asreq frame format 1897 * [2] capability information 1898 * [2] listen interval 1899 * [6*] current AP address (reassoc only) 1900 * [tlv] ssid 1901 * [tlv] supported rates 1902 * [tlv] extended supported rates 1903 * [4] power capability (optional) 1904 * [28] supported channels (optional) 1905 * [tlv] HT capabilities 1906 * [tlv] WME (optional) 1907 * [tlv] Vendor OUI HT capabilities (optional) 1908 * [tlv] Atheros capabilities (if negotiated) 1909 * [tlv] AppIE's (optional) 1910 */ 1911 m = ieee80211_getmgtframe(&frm, 1912 ic->ic_headroom + sizeof(struct ieee80211_frame), 1913 sizeof(uint16_t) 1914 + sizeof(uint16_t) 1915 + IEEE80211_ADDR_LEN 1916 + 2 + IEEE80211_NWID_LEN 1917 + 2 + IEEE80211_RATE_SIZE 1918 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1919 + 4 1920 + 2 + 26 1921 + sizeof(struct ieee80211_wme_info) 1922 + sizeof(struct ieee80211_ie_htcap) 1923 + 4 + sizeof(struct ieee80211_ie_htcap) 1924 + sizeof(struct ieee80211_ath_ie) 1925 + (vap->iv_appie_wpa != NULL ? 1926 vap->iv_appie_wpa->ie_len : 0) 1927 + (vap->iv_appie_assocreq != NULL ? 1928 vap->iv_appie_assocreq->ie_len : 0) 1929 ); 1930 if (m == NULL) 1931 senderr(ENOMEM, is_tx_nobuf); 1932 1933 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1934 ("wrong mode %u", vap->iv_opmode)); 1935 capinfo = IEEE80211_CAPINFO_ESS; 1936 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1937 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1938 /* 1939 * NB: Some 11a AP's reject the request when 1940 * short premable is set. 1941 */ 1942 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1943 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1944 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1945 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1946 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1947 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1948 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1949 (vap->iv_flags & IEEE80211_F_DOTH)) 1950 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1951 *(uint16_t *)frm = htole16(capinfo); 1952 frm += 2; 1953 1954 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1955 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1956 bss->ni_intval)); 1957 frm += 2; 1958 1959 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1960 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1961 frm += IEEE80211_ADDR_LEN; 1962 } 1963 1964 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1965 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1966 if (vap->iv_flags & IEEE80211_F_WPA2) { 1967 if (vap->iv_rsn_ie != NULL) 1968 frm = add_ie(frm, vap->iv_rsn_ie); 1969 /* XXX else complain? */ 1970 } 1971 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1972 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1973 frm = ieee80211_add_powercapability(frm, 1974 ic->ic_curchan); 1975 frm = ieee80211_add_supportedchannels(frm, ic); 1976 } 1977 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1978 ni->ni_ies.htcap_ie != NULL && 1979 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1980 frm = ieee80211_add_htcap(frm, ni); 1981 if (vap->iv_flags & IEEE80211_F_WPA1) { 1982 if (vap->iv_wpa_ie != NULL) 1983 frm = add_ie(frm, vap->iv_wpa_ie); 1984 /* XXX else complain */ 1985 } 1986 if ((ic->ic_flags & IEEE80211_F_WME) && 1987 ni->ni_ies.wme_ie != NULL) 1988 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1989 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1990 ni->ni_ies.htcap_ie != NULL && 1991 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1992 frm = ieee80211_add_htcap_vendor(frm, ni); 1993 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1994 frm = ieee80211_add_ath(frm, 1995 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1996 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 1997 ni->ni_authmode != IEEE80211_AUTH_8021X && 1998 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 1999 vap->iv_def_txkey : 0x7fff); 2000 if (vap->iv_appie_assocreq != NULL) 2001 frm = add_appie(frm, vap->iv_appie_assocreq); 2002 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2003 2004 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2005 (void *) vap->iv_state); 2006 break; 2007 2008 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2009 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2010 /* 2011 * asresp frame format 2012 * [2] capability information 2013 * [2] status 2014 * [2] association ID 2015 * [tlv] supported rates 2016 * [tlv] extended supported rates 2017 * [tlv] HT capabilities (standard, if STA enabled) 2018 * [tlv] HT information (standard, if STA enabled) 2019 * [tlv] WME (if configured and STA enabled) 2020 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2021 * [tlv] HT information (vendor OUI, if STA enabled) 2022 * [tlv] Atheros capabilities (if STA enabled) 2023 * [tlv] AppIE's (optional) 2024 */ 2025 m = ieee80211_getmgtframe(&frm, 2026 ic->ic_headroom + sizeof(struct ieee80211_frame), 2027 sizeof(uint16_t) 2028 + sizeof(uint16_t) 2029 + sizeof(uint16_t) 2030 + 2 + IEEE80211_RATE_SIZE 2031 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2032 + sizeof(struct ieee80211_ie_htcap) + 4 2033 + sizeof(struct ieee80211_ie_htinfo) + 4 2034 + sizeof(struct ieee80211_wme_param) 2035 + sizeof(struct ieee80211_ath_ie) 2036 + (vap->iv_appie_assocresp != NULL ? 2037 vap->iv_appie_assocresp->ie_len : 0) 2038 ); 2039 if (m == NULL) 2040 senderr(ENOMEM, is_tx_nobuf); 2041 2042 capinfo = getcapinfo(vap, bss->ni_chan); 2043 *(uint16_t *)frm = htole16(capinfo); 2044 frm += 2; 2045 2046 *(uint16_t *)frm = htole16(arg); /* status */ 2047 frm += 2; 2048 2049 if (arg == IEEE80211_STATUS_SUCCESS) { 2050 *(uint16_t *)frm = htole16(ni->ni_associd); 2051 IEEE80211_NODE_STAT(ni, tx_assoc); 2052 } else 2053 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2054 frm += 2; 2055 2056 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2057 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2058 /* NB: respond according to what we received */ 2059 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2060 frm = ieee80211_add_htcap(frm, ni); 2061 frm = ieee80211_add_htinfo(frm, ni); 2062 } 2063 if ((vap->iv_flags & IEEE80211_F_WME) && 2064 ni->ni_ies.wme_ie != NULL) 2065 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2066 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2067 frm = ieee80211_add_htcap_vendor(frm, ni); 2068 frm = ieee80211_add_htinfo_vendor(frm, ni); 2069 } 2070 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2071 frm = ieee80211_add_ath(frm, 2072 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2073 ni->ni_ath_defkeyix); 2074 if (vap->iv_appie_assocresp != NULL) 2075 frm = add_appie(frm, vap->iv_appie_assocresp); 2076 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2077 break; 2078 2079 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2080 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2081 "send station disassociate (reason %d)", arg); 2082 m = ieee80211_getmgtframe(&frm, 2083 ic->ic_headroom + sizeof(struct ieee80211_frame), 2084 sizeof(uint16_t)); 2085 if (m == NULL) 2086 senderr(ENOMEM, is_tx_nobuf); 2087 *(uint16_t *)frm = htole16(arg); /* reason */ 2088 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2089 2090 IEEE80211_NODE_STAT(ni, tx_disassoc); 2091 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2092 break; 2093 2094 default: 2095 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2096 "invalid mgmt frame type %u", type); 2097 senderr(EINVAL, is_tx_unknownmgt); 2098 /* NOTREACHED */ 2099 } 2100 2101 return ieee80211_mgmt_output(ni, m, type); 2102bad: 2103 ieee80211_free_node(ni); 2104 return ret; 2105#undef senderr 2106#undef HTFLAGS 2107} 2108 2109/* 2110 * Return an mbuf with a probe response frame in it. 2111 * Space is left to prepend and 802.11 header at the 2112 * front but it's left to the caller to fill in. 2113 */ 2114struct mbuf * 2115ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2116{ 2117 struct ieee80211vap *vap = bss->ni_vap; 2118 struct ieee80211com *ic = bss->ni_ic; 2119 const struct ieee80211_rateset *rs; 2120 struct mbuf *m; 2121 uint16_t capinfo; 2122 uint8_t *frm; 2123 2124 /* 2125 * probe response frame format 2126 * [8] time stamp 2127 * [2] beacon interval 2128 * [2] cabability information 2129 * [tlv] ssid 2130 * [tlv] supported rates 2131 * [tlv] parameter set (FH/DS) 2132 * [tlv] parameter set (IBSS) 2133 * [tlv] country (optional) 2134 * [3] power control (optional) 2135 * [5] channel switch announcement (CSA) (optional) 2136 * [tlv] extended rate phy (ERP) 2137 * [tlv] extended supported rates 2138 * [tlv] RSN (optional) 2139 * [tlv] HT capabilities 2140 * [tlv] HT information 2141 * [tlv] WPA (optional) 2142 * [tlv] WME (optional) 2143 * [tlv] Vendor OUI HT capabilities (optional) 2144 * [tlv] Vendor OUI HT information (optional) 2145 * [tlv] Atheros capabilities 2146 * [tlv] AppIE's (optional) 2147 */ 2148 m = ieee80211_getmgtframe(&frm, 2149 ic->ic_headroom + sizeof(struct ieee80211_frame), 2150 8 2151 + sizeof(uint16_t) 2152 + sizeof(uint16_t) 2153 + 2 + IEEE80211_NWID_LEN 2154 + 2 + IEEE80211_RATE_SIZE 2155 + 7 /* max(7,3) */ 2156 + IEEE80211_COUNTRY_MAX_SIZE 2157 + 3 2158 + sizeof(struct ieee80211_csa_ie) 2159 + 3 2160 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2161 + sizeof(struct ieee80211_ie_wpa) 2162 + sizeof(struct ieee80211_ie_htcap) 2163 + sizeof(struct ieee80211_ie_htinfo) 2164 + sizeof(struct ieee80211_ie_wpa) 2165 + sizeof(struct ieee80211_wme_param) 2166 + 4 + sizeof(struct ieee80211_ie_htcap) 2167 + 4 + sizeof(struct ieee80211_ie_htinfo) 2168 + sizeof(struct ieee80211_ath_ie) 2169 + (vap->iv_appie_proberesp != NULL ? 2170 vap->iv_appie_proberesp->ie_len : 0) 2171 ); 2172 if (m == NULL) { 2173 vap->iv_stats.is_tx_nobuf++; 2174 return NULL; 2175 } 2176 2177 memset(frm, 0, 8); /* timestamp should be filled later */ 2178 frm += 8; 2179 *(uint16_t *)frm = htole16(bss->ni_intval); 2180 frm += 2; 2181 capinfo = getcapinfo(vap, bss->ni_chan); 2182 *(uint16_t *)frm = htole16(capinfo); 2183 frm += 2; 2184 2185 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2186 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2187 frm = ieee80211_add_rates(frm, rs); 2188 2189 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2190 *frm++ = IEEE80211_ELEMID_FHPARMS; 2191 *frm++ = 5; 2192 *frm++ = bss->ni_fhdwell & 0x00ff; 2193 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2194 *frm++ = IEEE80211_FH_CHANSET( 2195 ieee80211_chan2ieee(ic, bss->ni_chan)); 2196 *frm++ = IEEE80211_FH_CHANPAT( 2197 ieee80211_chan2ieee(ic, bss->ni_chan)); 2198 *frm++ = bss->ni_fhindex; 2199 } else { 2200 *frm++ = IEEE80211_ELEMID_DSPARMS; 2201 *frm++ = 1; 2202 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2203 } 2204 2205 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2206 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2207 *frm++ = 2; 2208 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2209 } 2210 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2211 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2212 frm = ieee80211_add_countryie(frm, ic); 2213 if (vap->iv_flags & IEEE80211_F_DOTH) { 2214 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2215 frm = ieee80211_add_powerconstraint(frm, vap); 2216 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2217 frm = ieee80211_add_csa(frm, vap); 2218 } 2219 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2220 frm = ieee80211_add_erp(frm, ic); 2221 frm = ieee80211_add_xrates(frm, rs); 2222 if (vap->iv_flags & IEEE80211_F_WPA2) { 2223 if (vap->iv_rsn_ie != NULL) 2224 frm = add_ie(frm, vap->iv_rsn_ie); 2225 /* XXX else complain? */ 2226 } 2227 /* 2228 * NB: legacy 11b clients do not get certain ie's. 2229 * The caller identifies such clients by passing 2230 * a token in legacy to us. Could expand this to be 2231 * any legacy client for stuff like HT ie's. 2232 */ 2233 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2234 legacy != IEEE80211_SEND_LEGACY_11B) { 2235 frm = ieee80211_add_htcap(frm, bss); 2236 frm = ieee80211_add_htinfo(frm, bss); 2237 } 2238 if (vap->iv_flags & IEEE80211_F_WPA1) { 2239 if (vap->iv_wpa_ie != NULL) 2240 frm = add_ie(frm, vap->iv_wpa_ie); 2241 /* XXX else complain? */ 2242 } 2243 if (vap->iv_flags & IEEE80211_F_WME) 2244 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2245 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2246 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2247 legacy != IEEE80211_SEND_LEGACY_11B) { 2248 frm = ieee80211_add_htcap_vendor(frm, bss); 2249 frm = ieee80211_add_htinfo_vendor(frm, bss); 2250 } 2251 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2252 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2253 bss->ni_ath_defkeyix); 2254 if (vap->iv_appie_proberesp != NULL) 2255 frm = add_appie(frm, vap->iv_appie_proberesp); 2256 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2257 2258 return m; 2259} 2260 2261/* 2262 * Send a probe response frame to the specified mac address. 2263 * This does not go through the normal mgt frame api so we 2264 * can specify the destination address and re-use the bss node 2265 * for the sta reference. 2266 */ 2267int 2268ieee80211_send_proberesp(struct ieee80211vap *vap, 2269 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2270{ 2271 struct ieee80211_node *bss = vap->iv_bss; 2272 struct ieee80211com *ic = vap->iv_ic; 2273 struct ieee80211_frame *wh; 2274 struct mbuf *m; 2275 2276 if (vap->iv_state == IEEE80211_S_CAC) { 2277 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2278 "block %s frame in CAC state", "probe response"); 2279 vap->iv_stats.is_tx_badstate++; 2280 return EIO; /* XXX */ 2281 } 2282 2283 /* 2284 * Hold a reference on the node so it doesn't go away until after 2285 * the xmit is complete all the way in the driver. On error we 2286 * will remove our reference. 2287 */ 2288 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2289 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2290 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2291 ieee80211_node_refcnt(bss)+1); 2292 ieee80211_ref_node(bss); 2293 2294 m = ieee80211_alloc_proberesp(bss, legacy); 2295 if (m == NULL) { 2296 ieee80211_free_node(bss); 2297 return ENOMEM; 2298 } 2299 2300 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2301 KASSERT(m != NULL, ("no room for header")); 2302 2303 wh = mtod(m, struct ieee80211_frame *); 2304 ieee80211_send_setup(bss, wh, 2305 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2306 vap->iv_myaddr, da, bss->ni_bssid); 2307 /* XXX power management? */ 2308 2309 M_WME_SETAC(m, WME_AC_BE); 2310 2311 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2312 "send probe resp on channel %u to %s%s\n", 2313 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2314 legacy ? " <legacy>" : ""); 2315 IEEE80211_NODE_STAT(bss, tx_mgmt); 2316 2317 return ic->ic_raw_xmit(bss, m, NULL); 2318} 2319 2320/* 2321 * Allocate and build a RTS (Request To Send) control frame. 2322 */ 2323struct mbuf * 2324ieee80211_alloc_rts(struct ieee80211com *ic, 2325 const uint8_t ra[IEEE80211_ADDR_LEN], 2326 const uint8_t ta[IEEE80211_ADDR_LEN], 2327 uint16_t dur) 2328{ 2329 struct ieee80211_frame_rts *rts; 2330 struct mbuf *m; 2331 2332 /* XXX honor ic_headroom */ 2333 m = m_gethdr(M_DONTWAIT, MT_DATA); 2334 if (m != NULL) { 2335 rts = mtod(m, struct ieee80211_frame_rts *); 2336 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2337 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2338 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2339 *(u_int16_t *)rts->i_dur = htole16(dur); 2340 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2341 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2342 2343 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2344 } 2345 return m; 2346} 2347 2348/* 2349 * Allocate and build a CTS (Clear To Send) control frame. 2350 */ 2351struct mbuf * 2352ieee80211_alloc_cts(struct ieee80211com *ic, 2353 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2354{ 2355 struct ieee80211_frame_cts *cts; 2356 struct mbuf *m; 2357 2358 /* XXX honor ic_headroom */ 2359 m = m_gethdr(M_DONTWAIT, MT_DATA); 2360 if (m != NULL) { 2361 cts = mtod(m, struct ieee80211_frame_cts *); 2362 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2363 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2364 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2365 *(u_int16_t *)cts->i_dur = htole16(dur); 2366 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2367 2368 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2369 } 2370 return m; 2371} 2372 2373static void 2374ieee80211_tx_mgt_timeout(void *arg) 2375{ 2376 struct ieee80211_node *ni = arg; 2377 struct ieee80211vap *vap = ni->ni_vap; 2378 2379 if (vap->iv_state != IEEE80211_S_INIT && 2380 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2381 /* 2382 * NB: it's safe to specify a timeout as the reason here; 2383 * it'll only be used in the right state. 2384 */ 2385 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2386 IEEE80211_SCAN_FAIL_TIMEOUT); 2387 } 2388} 2389 2390static void 2391ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2392{ 2393 struct ieee80211vap *vap = ni->ni_vap; 2394 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2395 2396 /* 2397 * Frame transmit completed; arrange timer callback. If 2398 * transmit was successfuly we wait for response. Otherwise 2399 * we arrange an immediate callback instead of doing the 2400 * callback directly since we don't know what state the driver 2401 * is in (e.g. what locks it is holding). This work should 2402 * not be too time-critical and not happen too often so the 2403 * added overhead is acceptable. 2404 * 2405 * XXX what happens if !acked but response shows up before callback? 2406 */ 2407 if (vap->iv_state == ostate) 2408 callout_reset(&vap->iv_mgtsend, 2409 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2410 ieee80211_tx_mgt_timeout, ni); 2411} 2412 2413static void 2414ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2415 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2416{ 2417 struct ieee80211vap *vap = ni->ni_vap; 2418 struct ieee80211com *ic = ni->ni_ic; 2419 struct ieee80211_rateset *rs = &ni->ni_rates; 2420 uint16_t capinfo; 2421 2422 /* 2423 * beacon frame format 2424 * [8] time stamp 2425 * [2] beacon interval 2426 * [2] cabability information 2427 * [tlv] ssid 2428 * [tlv] supported rates 2429 * [3] parameter set (DS) 2430 * [8] CF parameter set (optional) 2431 * [tlv] parameter set (IBSS/TIM) 2432 * [tlv] country (optional) 2433 * [3] power control (optional) 2434 * [5] channel switch announcement (CSA) (optional) 2435 * [tlv] extended rate phy (ERP) 2436 * [tlv] extended supported rates 2437 * [tlv] RSN parameters 2438 * [tlv] HT capabilities 2439 * [tlv] HT information 2440 * XXX Vendor-specific OIDs (e.g. Atheros) 2441 * [tlv] WPA parameters 2442 * [tlv] WME parameters 2443 * [tlv] Vendor OUI HT capabilities (optional) 2444 * [tlv] Vendor OUI HT information (optional) 2445 * [tlv] application data (optional) 2446 */ 2447 2448 memset(bo, 0, sizeof(*bo)); 2449 2450 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2451 frm += 8; 2452 *(uint16_t *)frm = htole16(ni->ni_intval); 2453 frm += 2; 2454 capinfo = getcapinfo(vap, ni->ni_chan); 2455 bo->bo_caps = (uint16_t *)frm; 2456 *(uint16_t *)frm = htole16(capinfo); 2457 frm += 2; 2458 *frm++ = IEEE80211_ELEMID_SSID; 2459 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2460 *frm++ = ni->ni_esslen; 2461 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2462 frm += ni->ni_esslen; 2463 } else 2464 *frm++ = 0; 2465 frm = ieee80211_add_rates(frm, rs); 2466 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2467 *frm++ = IEEE80211_ELEMID_DSPARMS; 2468 *frm++ = 1; 2469 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2470 } 2471 if (ic->ic_flags & IEEE80211_F_PCF) { 2472 bo->bo_cfp = frm; 2473 frm = ieee80211_add_cfparms(frm, ic); 2474 } 2475 bo->bo_tim = frm; 2476 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2477 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2478 *frm++ = 2; 2479 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2480 bo->bo_tim_len = 0; 2481 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2482 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2483 2484 tie->tim_ie = IEEE80211_ELEMID_TIM; 2485 tie->tim_len = 4; /* length */ 2486 tie->tim_count = 0; /* DTIM count */ 2487 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2488 tie->tim_bitctl = 0; /* bitmap control */ 2489 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2490 frm += sizeof(struct ieee80211_tim_ie); 2491 bo->bo_tim_len = 1; 2492 } 2493 bo->bo_tim_trailer = frm; 2494 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2495 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2496 frm = ieee80211_add_countryie(frm, ic); 2497 if (vap->iv_flags & IEEE80211_F_DOTH) { 2498 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2499 frm = ieee80211_add_powerconstraint(frm, vap); 2500 bo->bo_csa = frm; 2501 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2502 frm = ieee80211_add_csa(frm, vap); 2503 } else 2504 bo->bo_csa = frm; 2505 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2506 bo->bo_erp = frm; 2507 frm = ieee80211_add_erp(frm, ic); 2508 } 2509 frm = ieee80211_add_xrates(frm, rs); 2510 if (vap->iv_flags & IEEE80211_F_WPA2) { 2511 if (vap->iv_rsn_ie != NULL) 2512 frm = add_ie(frm, vap->iv_rsn_ie); 2513 /* XXX else complain */ 2514 } 2515 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2516 frm = ieee80211_add_htcap(frm, ni); 2517 bo->bo_htinfo = frm; 2518 frm = ieee80211_add_htinfo(frm, ni); 2519 } 2520 if (vap->iv_flags & IEEE80211_F_WPA1) { 2521 if (vap->iv_wpa_ie != NULL) 2522 frm = add_ie(frm, vap->iv_wpa_ie); 2523 /* XXX else complain */ 2524 } 2525 if (vap->iv_flags & IEEE80211_F_WME) { 2526 bo->bo_wme = frm; 2527 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2528 } 2529 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2530 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2531 frm = ieee80211_add_htcap_vendor(frm, ni); 2532 frm = ieee80211_add_htinfo_vendor(frm, ni); 2533 } 2534 if (vap->iv_appie_beacon != NULL) { 2535 bo->bo_appie = frm; 2536 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2537 frm = add_appie(frm, vap->iv_appie_beacon); 2538 } 2539 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2540 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2541 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2542} 2543 2544/* 2545 * Allocate a beacon frame and fillin the appropriate bits. 2546 */ 2547struct mbuf * 2548ieee80211_beacon_alloc(struct ieee80211_node *ni, 2549 struct ieee80211_beacon_offsets *bo) 2550{ 2551 struct ieee80211vap *vap = ni->ni_vap; 2552 struct ieee80211com *ic = ni->ni_ic; 2553 struct ifnet *ifp = vap->iv_ifp; 2554 struct ieee80211_frame *wh; 2555 struct mbuf *m; 2556 int pktlen; 2557 uint8_t *frm; 2558 2559 /* 2560 * beacon frame format 2561 * [8] time stamp 2562 * [2] beacon interval 2563 * [2] cabability information 2564 * [tlv] ssid 2565 * [tlv] supported rates 2566 * [3] parameter set (DS) 2567 * [8] CF parameter set (optional) 2568 * [tlv] parameter set (IBSS/TIM) 2569 * [tlv] country (optional) 2570 * [3] power control (optional) 2571 * [5] channel switch announcement (CSA) (optional) 2572 * [tlv] extended rate phy (ERP) 2573 * [tlv] extended supported rates 2574 * [tlv] RSN parameters 2575 * [tlv] HT capabilities 2576 * [tlv] HT information 2577 * [tlv] Vendor OUI HT capabilities (optional) 2578 * [tlv] Vendor OUI HT information (optional) 2579 * XXX Vendor-specific OIDs (e.g. Atheros) 2580 * [tlv] WPA parameters 2581 * [tlv] WME parameters 2582 * [tlv] application data (optional) 2583 * NB: we allocate the max space required for the TIM bitmap. 2584 * XXX how big is this? 2585 */ 2586 pktlen = 8 /* time stamp */ 2587 + sizeof(uint16_t) /* beacon interval */ 2588 + sizeof(uint16_t) /* capabilities */ 2589 + 2 + ni->ni_esslen /* ssid */ 2590 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2591 + 2 + 1 /* DS parameters */ 2592 + 2 + 6 /* CF parameters */ 2593 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2594 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2595 + 2 + 1 /* power control */ 2596 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2597 + 2 + 1 /* ERP */ 2598 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2599 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2600 2*sizeof(struct ieee80211_ie_wpa) : 0) 2601 /* XXX conditional? */ 2602 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2603 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2604 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2605 sizeof(struct ieee80211_wme_param) : 0) 2606 + IEEE80211_MAX_APPIE 2607 ; 2608 m = ieee80211_getmgtframe(&frm, 2609 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2610 if (m == NULL) { 2611 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2612 "%s: cannot get buf; size %u\n", __func__, pktlen); 2613 vap->iv_stats.is_tx_nobuf++; 2614 return NULL; 2615 } 2616 ieee80211_beacon_construct(m, frm, bo, ni); 2617 2618 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2619 KASSERT(m != NULL, ("no space for 802.11 header?")); 2620 wh = mtod(m, struct ieee80211_frame *); 2621 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2622 IEEE80211_FC0_SUBTYPE_BEACON; 2623 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2624 *(uint16_t *)wh->i_dur = 0; 2625 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2626 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2627 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2628 *(uint16_t *)wh->i_seq = 0; 2629 2630 return m; 2631} 2632 2633/* 2634 * Update the dynamic parts of a beacon frame based on the current state. 2635 */ 2636int 2637ieee80211_beacon_update(struct ieee80211_node *ni, 2638 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2639{ 2640 struct ieee80211vap *vap = ni->ni_vap; 2641 struct ieee80211com *ic = ni->ni_ic; 2642 int len_changed = 0; 2643 uint16_t capinfo; 2644 2645 IEEE80211_LOCK(ic); 2646 /* 2647 * Handle 11h channel change when we've reached the count. 2648 * We must recalculate the beacon frame contents to account 2649 * for the new channel. Note we do this only for the first 2650 * vap that reaches this point; subsequent vaps just update 2651 * their beacon state to reflect the recalculated channel. 2652 */ 2653 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2654 vap->iv_csa_count == ic->ic_csa_count) { 2655 vap->iv_csa_count = 0; 2656 /* 2657 * Effect channel change before reconstructing the beacon 2658 * frame contents as many places reference ni_chan. 2659 */ 2660 if (ic->ic_csa_newchan != NULL) 2661 ieee80211_csa_completeswitch(ic); 2662 /* 2663 * NB: ieee80211_beacon_construct clears all pending 2664 * updates in bo_flags so we don't need to explicitly 2665 * clear IEEE80211_BEACON_CSA. 2666 */ 2667 ieee80211_beacon_construct(m, 2668 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2669 2670 /* XXX do WME aggressive mode processing? */ 2671 IEEE80211_UNLOCK(ic); 2672 return 1; /* just assume length changed */ 2673 } 2674 2675 /* XXX faster to recalculate entirely or just changes? */ 2676 capinfo = getcapinfo(vap, ni->ni_chan); 2677 *bo->bo_caps = htole16(capinfo); 2678 2679 if (vap->iv_flags & IEEE80211_F_WME) { 2680 struct ieee80211_wme_state *wme = &ic->ic_wme; 2681 2682 /* 2683 * Check for agressive mode change. When there is 2684 * significant high priority traffic in the BSS 2685 * throttle back BE traffic by using conservative 2686 * parameters. Otherwise BE uses agressive params 2687 * to optimize performance of legacy/non-QoS traffic. 2688 */ 2689 if (wme->wme_flags & WME_F_AGGRMODE) { 2690 if (wme->wme_hipri_traffic > 2691 wme->wme_hipri_switch_thresh) { 2692 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2693 "%s: traffic %u, disable aggressive mode\n", 2694 __func__, wme->wme_hipri_traffic); 2695 wme->wme_flags &= ~WME_F_AGGRMODE; 2696 ieee80211_wme_updateparams_locked(vap); 2697 wme->wme_hipri_traffic = 2698 wme->wme_hipri_switch_hysteresis; 2699 } else 2700 wme->wme_hipri_traffic = 0; 2701 } else { 2702 if (wme->wme_hipri_traffic <= 2703 wme->wme_hipri_switch_thresh) { 2704 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2705 "%s: traffic %u, enable aggressive mode\n", 2706 __func__, wme->wme_hipri_traffic); 2707 wme->wme_flags |= WME_F_AGGRMODE; 2708 ieee80211_wme_updateparams_locked(vap); 2709 wme->wme_hipri_traffic = 0; 2710 } else 2711 wme->wme_hipri_traffic = 2712 wme->wme_hipri_switch_hysteresis; 2713 } 2714 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2715 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2716 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2717 } 2718 } 2719 2720 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2721 ieee80211_ht_update_beacon(vap, bo); 2722 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2723 } 2724 2725 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2726 struct ieee80211_tim_ie *tie = 2727 (struct ieee80211_tim_ie *) bo->bo_tim; 2728 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2729 u_int timlen, timoff, i; 2730 /* 2731 * ATIM/DTIM needs updating. If it fits in the 2732 * current space allocated then just copy in the 2733 * new bits. Otherwise we need to move any trailing 2734 * data to make room. Note that we know there is 2735 * contiguous space because ieee80211_beacon_allocate 2736 * insures there is space in the mbuf to write a 2737 * maximal-size virtual bitmap (based on iv_max_aid). 2738 */ 2739 /* 2740 * Calculate the bitmap size and offset, copy any 2741 * trailer out of the way, and then copy in the 2742 * new bitmap and update the information element. 2743 * Note that the tim bitmap must contain at least 2744 * one byte and any offset must be even. 2745 */ 2746 if (vap->iv_ps_pending != 0) { 2747 timoff = 128; /* impossibly large */ 2748 for (i = 0; i < vap->iv_tim_len; i++) 2749 if (vap->iv_tim_bitmap[i]) { 2750 timoff = i &~ 1; 2751 break; 2752 } 2753 KASSERT(timoff != 128, ("tim bitmap empty!")); 2754 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2755 if (vap->iv_tim_bitmap[i]) 2756 break; 2757 timlen = 1 + (i - timoff); 2758 } else { 2759 timoff = 0; 2760 timlen = 1; 2761 } 2762 if (timlen != bo->bo_tim_len) { 2763 /* copy up/down trailer */ 2764 int adjust = tie->tim_bitmap+timlen 2765 - bo->bo_tim_trailer; 2766 ovbcopy(bo->bo_tim_trailer, 2767 bo->bo_tim_trailer+adjust, 2768 bo->bo_tim_trailer_len); 2769 bo->bo_tim_trailer += adjust; 2770 bo->bo_erp += adjust; 2771 bo->bo_htinfo += adjust; 2772 bo->bo_appie += adjust; 2773 bo->bo_wme += adjust; 2774 bo->bo_csa += adjust; 2775 bo->bo_tim_len = timlen; 2776 2777 /* update information element */ 2778 tie->tim_len = 3 + timlen; 2779 tie->tim_bitctl = timoff; 2780 len_changed = 1; 2781 } 2782 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2783 bo->bo_tim_len); 2784 2785 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2786 2787 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2788 "%s: TIM updated, pending %u, off %u, len %u\n", 2789 __func__, vap->iv_ps_pending, timoff, timlen); 2790 } 2791 /* count down DTIM period */ 2792 if (tie->tim_count == 0) 2793 tie->tim_count = tie->tim_period - 1; 2794 else 2795 tie->tim_count--; 2796 /* update state for buffered multicast frames on DTIM */ 2797 if (mcast && tie->tim_count == 0) 2798 tie->tim_bitctl |= 1; 2799 else 2800 tie->tim_bitctl &= ~1; 2801 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2802 struct ieee80211_csa_ie *csa = 2803 (struct ieee80211_csa_ie *) bo->bo_csa; 2804 2805 /* 2806 * Insert or update CSA ie. If we're just starting 2807 * to count down to the channel switch then we need 2808 * to insert the CSA ie. Otherwise we just need to 2809 * drop the count. The actual change happens above 2810 * when the vap's count reaches the target count. 2811 */ 2812 if (vap->iv_csa_count == 0) { 2813 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2814 bo->bo_erp += sizeof(*csa); 2815 bo->bo_wme += sizeof(*csa); 2816 bo->bo_appie += sizeof(*csa); 2817 bo->bo_csa_trailer_len += sizeof(*csa); 2818 bo->bo_tim_trailer_len += sizeof(*csa); 2819 m->m_len += sizeof(*csa); 2820 m->m_pkthdr.len += sizeof(*csa); 2821 2822 ieee80211_add_csa(bo->bo_csa, vap); 2823 } else 2824 csa->csa_count--; 2825 vap->iv_csa_count++; 2826 /* NB: don't clear IEEE80211_BEACON_CSA */ 2827 } 2828 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2829 /* 2830 * ERP element needs updating. 2831 */ 2832 (void) ieee80211_add_erp(bo->bo_erp, ic); 2833 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2834 } 2835 } 2836 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2837 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2838 int aielen; 2839 uint8_t *frm; 2840 2841 aielen = 0; 2842 if (aie != NULL) 2843 aielen += aie->ie_len; 2844 if (aielen != bo->bo_appie_len) { 2845 /* copy up/down trailer */ 2846 int adjust = aielen - bo->bo_appie_len; 2847 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2848 bo->bo_tim_trailer_len); 2849 bo->bo_tim_trailer += adjust; 2850 bo->bo_appie += adjust; 2851 bo->bo_appie_len = aielen; 2852 2853 len_changed = 1; 2854 } 2855 frm = bo->bo_appie; 2856 if (aie != NULL) 2857 frm = add_appie(frm, aie); 2858 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2859 } 2860 IEEE80211_UNLOCK(ic); 2861 2862 return len_changed; 2863} 2864