ieee80211_output.c revision 184271
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 184271 2008-10-25 23:28:04Z sam $"); 29 30#include "opt_inet.h" 31#include "opt_wlan.h" 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/mbuf.h> 36#include <sys/kernel.h> 37#include <sys/endian.h> 38 39#include <sys/socket.h> 40 41#include <net/bpf.h> 42#include <net/ethernet.h> 43#include <net/if.h> 44#include <net/if_llc.h> 45#include <net/if_media.h> 46#include <net/if_vlan_var.h> 47 48#include <net80211/ieee80211_var.h> 49#include <net80211/ieee80211_regdomain.h> 50#include <net80211/ieee80211_wds.h> 51 52#ifdef INET 53#include <netinet/in.h> 54#include <netinet/if_ether.h> 55#include <netinet/in_systm.h> 56#include <netinet/ip.h> 57#endif 58 59#define ETHER_HEADER_COPY(dst, src) \ 60 memcpy(dst, src, sizeof(struct ether_header)) 61 62static struct mbuf *ieee80211_encap_fastframe(struct ieee80211vap *, 63 struct mbuf *m1, const struct ether_header *eh1, 64 struct mbuf *m2, const struct ether_header *eh2); 65static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 66 u_int hdrsize, u_int ciphdrsize, u_int mtu); 67static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 68 69#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 /* XXX mark vap to identify if associd is required */ 207 if (ni->ni_associd == 0 && 208 (vap->iv_opmode == IEEE80211_M_STA || 209 vap->iv_opmode == IEEE80211_M_HOSTAP || IS_DWDS(vap))) { 210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 211 eh->ether_dhost, NULL, 212 "sta not associated (type 0x%04x)", 213 htons(eh->ether_type)); 214 vap->iv_stats.is_tx_notassoc++; 215 ifp->if_oerrors++; 216 m_freem(m); 217 ieee80211_free_node(ni); 218 continue; 219 } 220 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 221 (m->m_flags & M_PWR_SAV) == 0) { 222 /* 223 * Station in power save mode; pass the frame 224 * to the 802.11 layer and continue. We'll get 225 * the frame back when the time is right. 226 * XXX lose WDS vap linkage? 227 */ 228 ieee80211_pwrsave(ni, m); 229 ieee80211_free_node(ni); 230 continue; 231 } 232 /* calculate priority so drivers can find the tx queue */ 233 if (ieee80211_classify(ni, m)) { 234 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 235 eh->ether_dhost, NULL, 236 "%s", "classification failure"); 237 vap->iv_stats.is_tx_classify++; 238 ifp->if_oerrors++; 239 m_freem(m); 240 ieee80211_free_node(ni); 241 continue; 242 } 243 244 BPF_MTAP(ifp, m); /* 802.11 tx path */ 245 246 /* 247 * XXX When ni is associated with a WDS link then 248 * the vap will be the WDS vap but ni_vap will point 249 * to the ap vap the station associated to. Once 250 * we handoff the packet to the driver the callback 251 * to ieee80211_encap won't be able to tell if the 252 * packet should be encapsulated for WDS or not (e.g. 253 * multicast frames will not be handled correctly). 254 * We hack this by marking the mbuf so ieee80211_encap 255 * can do the right thing. 256 */ 257 if (vap->iv_opmode == IEEE80211_M_WDS) 258 m->m_flags |= M_WDS; 259 else 260 m->m_flags &= ~M_WDS; 261 262 /* 263 * Stash the node pointer and hand the frame off to 264 * the underlying device. Note that we do this after 265 * any call to ieee80211_dwds_mcast because that code 266 * uses any existing value for rcvif. 267 */ 268 m->m_pkthdr.rcvif = (void *)ni; 269 270 /* XXX defer if_start calls? */ 271 IFQ_HANDOFF(parent, m, error); 272 if (error != 0) { 273 /* NB: IFQ_HANDOFF reclaims mbuf */ 274 ieee80211_free_node(ni); 275 } else { 276 ifp->if_opackets++; 277 } 278 ic->ic_lastdata = ticks; 279 } 280#undef IS_DWDS 281} 282 283/* 284 * 802.11 output routine. This is (currently) used only to 285 * connect bpf write calls to the 802.11 layer for injecting 286 * raw 802.11 frames. Note we locate the ieee80211com from 287 * the ifnet using a spare field setup at attach time. This 288 * will go away when the virtual ap support comes in. 289 */ 290int 291ieee80211_output(struct ifnet *ifp, struct mbuf *m, 292 struct sockaddr *dst, struct rtentry *rt0) 293{ 294#define senderr(e) do { error = (e); goto bad;} while (0) 295 struct ieee80211_node *ni = NULL; 296 struct ieee80211vap *vap; 297 struct ieee80211_frame *wh; 298 int error; 299 300 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 301 /* 302 * Short-circuit requests if the vap is marked OACTIVE 303 * as this is used when tearing down state to indicate 304 * the vap may be gone. This can also happen because a 305 * packet came down through ieee80211_start before the 306 * vap entered RUN state in which case it's also ok to 307 * just drop the frame. This should not be necessary 308 * but callers of if_output don't check OACTIVE. 309 */ 310 senderr(ENETDOWN); 311 } 312 vap = ifp->if_softc; 313 /* 314 * Hand to the 802.3 code if not tagged as 315 * a raw 802.11 frame. 316 */ 317 if (dst->sa_family != AF_IEEE80211) 318 return vap->iv_output(ifp, m, dst, rt0); 319#ifdef MAC 320 error = mac_check_ifnet_transmit(ifp, m); 321 if (error) 322 senderr(error); 323#endif 324 if (ifp->if_flags & IFF_MONITOR) 325 senderr(ENETDOWN); 326 if (!IFNET_IS_UP_RUNNING(ifp)) 327 senderr(ENETDOWN); 328 if (vap->iv_state == IEEE80211_S_CAC) { 329 IEEE80211_DPRINTF(vap, 330 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 331 "block %s frame in CAC state\n", "raw data"); 332 vap->iv_stats.is_tx_badstate++; 333 senderr(EIO); /* XXX */ 334 } 335 /* XXX bypass bridge, pfil, carp, etc. */ 336 337 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 338 senderr(EIO); /* XXX */ 339 wh = mtod(m, struct ieee80211_frame *); 340 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 341 IEEE80211_FC0_VERSION_0) 342 senderr(EIO); /* XXX */ 343 344 /* locate destination node */ 345 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 346 case IEEE80211_FC1_DIR_NODS: 347 case IEEE80211_FC1_DIR_FROMDS: 348 ni = ieee80211_find_txnode(vap, wh->i_addr1); 349 break; 350 case IEEE80211_FC1_DIR_TODS: 351 case IEEE80211_FC1_DIR_DSTODS: 352 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 353 senderr(EIO); /* XXX */ 354 ni = ieee80211_find_txnode(vap, wh->i_addr3); 355 break; 356 default: 357 senderr(EIO); /* XXX */ 358 } 359 if (ni == NULL) { 360 /* 361 * Permit packets w/ bpf params through regardless 362 * (see below about sa_len). 363 */ 364 if (dst->sa_len == 0) 365 senderr(EHOSTUNREACH); 366 ni = ieee80211_ref_node(vap->iv_bss); 367 } 368 369 /* 370 * Sanitize mbuf for net80211 flags leaked from above. 371 * 372 * NB: This must be done before ieee80211_classify as 373 * it marks EAPOL in frames with M_EAPOL. 374 */ 375 m->m_flags &= ~M_80211_TX; 376 377 /* calculate priority so drivers can find the tx queue */ 378 /* XXX assumes an 802.3 frame */ 379 if (ieee80211_classify(ni, m)) 380 senderr(EIO); /* XXX */ 381 382 BPF_MTAP(ifp, m); 383 384 /* 385 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 386 * present by setting the sa_len field of the sockaddr (yes, 387 * this is a hack). 388 * NB: we assume sa_data is suitably aligned to cast. 389 */ 390 return vap->iv_ic->ic_raw_xmit(ni, m, 391 (const struct ieee80211_bpf_params *)(dst->sa_len ? 392 dst->sa_data : NULL)); 393bad: 394 if (m != NULL) 395 m_freem(m); 396 if (ni != NULL) 397 ieee80211_free_node(ni); 398 return error; 399#undef senderr 400} 401 402/* 403 * Set the direction field and address fields of an outgoing 404 * non-QoS frame. Note this should be called early on in 405 * constructing a frame as it sets i_fc[1]; other bits can 406 * then be or'd in. 407 */ 408static void 409ieee80211_send_setup( 410 struct ieee80211_node *ni, 411 struct ieee80211_frame *wh, 412 int type, 413 const uint8_t sa[IEEE80211_ADDR_LEN], 414 const uint8_t da[IEEE80211_ADDR_LEN], 415 const uint8_t bssid[IEEE80211_ADDR_LEN]) 416{ 417#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 418 419 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 420 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 421 struct ieee80211vap *vap = ni->ni_vap; 422 423 switch (vap->iv_opmode) { 424 case IEEE80211_M_STA: 425 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 426 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 427 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 428 IEEE80211_ADDR_COPY(wh->i_addr3, da); 429 break; 430 case IEEE80211_M_IBSS: 431 case IEEE80211_M_AHDEMO: 432 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 433 IEEE80211_ADDR_COPY(wh->i_addr1, da); 434 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 435 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 436 break; 437 case IEEE80211_M_HOSTAP: 438 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 439 IEEE80211_ADDR_COPY(wh->i_addr1, da); 440 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 441 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 442 break; 443 case IEEE80211_M_WDS: 444 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 445 IEEE80211_ADDR_COPY(wh->i_addr1, da); 446 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 447 IEEE80211_ADDR_COPY(wh->i_addr3, da); 448 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 449 break; 450 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 451 break; 452 } 453 } else { 454 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 455 IEEE80211_ADDR_COPY(wh->i_addr1, da); 456 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 457 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 458 } 459 *(uint16_t *)&wh->i_dur[0] = 0; 460 /* XXX probe response use per-vap seq#? */ 461 /* NB: use non-QoS tid */ 462 *(uint16_t *)&wh->i_seq[0] = 463 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 464 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 465#undef WH4 466} 467 468/* 469 * Send a management frame to the specified node. The node pointer 470 * must have a reference as the pointer will be passed to the driver 471 * and potentially held for a long time. If the frame is successfully 472 * dispatched to the driver, then it is responsible for freeing the 473 * reference (and potentially free'ing up any associated storage); 474 * otherwise deal with reclaiming any reference (on error). 475 */ 476int 477ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type) 478{ 479 struct ieee80211vap *vap = ni->ni_vap; 480 struct ieee80211com *ic = ni->ni_ic; 481 struct ieee80211_frame *wh; 482 483 KASSERT(ni != NULL, ("null node")); 484 485 if (vap->iv_state == IEEE80211_S_CAC) { 486 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 487 ni, "block %s frame in CAC state", 488 ieee80211_mgt_subtype_name[ 489 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 490 IEEE80211_FC0_SUBTYPE_SHIFT]); 491 vap->iv_stats.is_tx_badstate++; 492 ieee80211_free_node(ni); 493 m_freem(m); 494 return EIO; /* XXX */ 495 } 496 497 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 498 if (m == NULL) { 499 ieee80211_free_node(ni); 500 return ENOMEM; 501 } 502 503 wh = mtod(m, struct ieee80211_frame *); 504 ieee80211_send_setup(ni, wh, 505 IEEE80211_FC0_TYPE_MGT | type, 506 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 507 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 508 m->m_flags &= ~M_LINK0; 509 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 510 "encrypting frame (%s)", __func__); 511 wh->i_fc[1] |= IEEE80211_FC1_WEP; 512 } 513 if (type != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 514 /* NB: force non-ProbeResp frames to the highest queue */ 515 M_WME_SETAC(m, WME_AC_VO); 516 } else 517 M_WME_SETAC(m, WME_AC_BE); 518#ifdef IEEE80211_DEBUG 519 /* avoid printing too many frames */ 520 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 521 ieee80211_msg_dumppkts(vap)) { 522 printf("[%s] send %s on channel %u\n", 523 ether_sprintf(wh->i_addr1), 524 ieee80211_mgt_subtype_name[ 525 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 526 IEEE80211_FC0_SUBTYPE_SHIFT], 527 ieee80211_chan2ieee(ic, ic->ic_curchan)); 528 } 529#endif 530 IEEE80211_NODE_STAT(ni, tx_mgmt); 531 532 return ic->ic_raw_xmit(ni, m, NULL); 533} 534 535/* 536 * Send a null data frame to the specified node. 537 * 538 * NB: the caller is assumed to have setup a node reference 539 * for use; this is necessary to deal with a race condition 540 * when probing for inactive stations. Like ieee80211_mgmt_output 541 * we must cleanup any node reference on error; however we 542 * can safely just unref it as we know it will never be the 543 * last reference to the node. 544 */ 545int 546ieee80211_send_nulldata(struct ieee80211_node *ni) 547{ 548 struct ieee80211vap *vap = ni->ni_vap; 549 struct ieee80211com *ic = ni->ni_ic; 550 struct mbuf *m; 551 struct ieee80211_frame *wh; 552 553 if (vap->iv_state == IEEE80211_S_CAC) { 554 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 555 ni, "block %s frame in CAC state", "null data"); 556 ieee80211_unref_node(&ni); 557 vap->iv_stats.is_tx_badstate++; 558 return EIO; /* XXX */ 559 } 560 561 m = m_gethdr(M_NOWAIT, MT_HEADER); 562 if (m == NULL) { 563 /* XXX debug msg */ 564 ieee80211_unref_node(&ni); 565 vap->iv_stats.is_tx_nobuf++; 566 return ENOMEM; 567 } 568 MH_ALIGN(m, sizeof(struct ieee80211_frame)); 569 570 wh = mtod(m, struct ieee80211_frame *); 571 ieee80211_send_setup(ni, wh, 572 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 573 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 574 if (vap->iv_opmode != IEEE80211_M_WDS) { 575 /* NB: power management bit is never sent by an AP */ 576 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 577 vap->iv_opmode != IEEE80211_M_HOSTAP) 578 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 579 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 580 } else { 581 /* NB: 4-address frame */ 582 m->m_len = m->m_pkthdr.len = 583 sizeof(struct ieee80211_frame_addr4); 584 } 585 M_WME_SETAC(m, WME_AC_BE); 586 587 IEEE80211_NODE_STAT(ni, tx_data); 588 589 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 590 "send null data frame on channel %u, pwr mgt %s", 591 ieee80211_chan2ieee(ic, ic->ic_curchan), 592 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 593 594 return ic->ic_raw_xmit(ni, m, NULL); 595} 596 597/* 598 * Assign priority to a frame based on any vlan tag assigned 599 * to the station and/or any Diffserv setting in an IP header. 600 * Finally, if an ACM policy is setup (in station mode) it's 601 * applied. 602 */ 603int 604ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 605{ 606 const struct ether_header *eh = mtod(m, struct ether_header *); 607 int v_wme_ac, d_wme_ac, ac; 608 609 /* 610 * Always promote PAE/EAPOL frames to high priority. 611 */ 612 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 613 /* NB: mark so others don't need to check header */ 614 m->m_flags |= M_EAPOL; 615 ac = WME_AC_VO; 616 goto done; 617 } 618 /* 619 * Non-qos traffic goes to BE. 620 */ 621 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 622 ac = WME_AC_BE; 623 goto done; 624 } 625 626 /* 627 * If node has a vlan tag then all traffic 628 * to it must have a matching tag. 629 */ 630 v_wme_ac = 0; 631 if (ni->ni_vlan != 0) { 632 if ((m->m_flags & M_VLANTAG) == 0) { 633 IEEE80211_NODE_STAT(ni, tx_novlantag); 634 return 1; 635 } 636 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 637 EVL_VLANOFTAG(ni->ni_vlan)) { 638 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 639 return 1; 640 } 641 /* map vlan priority to AC */ 642 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 643 } 644 645#ifdef INET 646 if (eh->ether_type == htons(ETHERTYPE_IP)) { 647 uint8_t tos; 648 /* 649 * IP frame, map the DSCP bits from the TOS field. 650 */ 651 /* XXX m_copydata may be too slow for fast path */ 652 /* NB: ip header may not be in first mbuf */ 653 m_copydata(m, sizeof(struct ether_header) + 654 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 655 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 656 d_wme_ac = TID_TO_WME_AC(tos); 657 } else { 658#endif /* INET */ 659 d_wme_ac = WME_AC_BE; 660#ifdef INET 661 } 662#endif 663 /* 664 * Use highest priority AC. 665 */ 666 if (v_wme_ac > d_wme_ac) 667 ac = v_wme_ac; 668 else 669 ac = d_wme_ac; 670 671 /* 672 * Apply ACM policy. 673 */ 674 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 675 static const int acmap[4] = { 676 WME_AC_BK, /* WME_AC_BE */ 677 WME_AC_BK, /* WME_AC_BK */ 678 WME_AC_BE, /* WME_AC_VI */ 679 WME_AC_VI, /* WME_AC_VO */ 680 }; 681 struct ieee80211com *ic = ni->ni_ic; 682 683 while (ac != WME_AC_BK && 684 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 685 ac = acmap[ac]; 686 } 687done: 688 M_WME_SETAC(m, ac); 689 return 0; 690} 691 692/* 693 * Insure there is sufficient contiguous space to encapsulate the 694 * 802.11 data frame. If room isn't already there, arrange for it. 695 * Drivers and cipher modules assume we have done the necessary work 696 * and fail rudely if they don't find the space they need. 697 */ 698static struct mbuf * 699ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 700 struct ieee80211_key *key, struct mbuf *m) 701{ 702#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 703 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 704 705 if (key != NULL) { 706 /* XXX belongs in crypto code? */ 707 needed_space += key->wk_cipher->ic_header; 708 /* XXX frags */ 709 /* 710 * When crypto is being done in the host we must insure 711 * the data are writable for the cipher routines; clone 712 * a writable mbuf chain. 713 * XXX handle SWMIC specially 714 */ 715 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 716 m = m_unshare(m, M_NOWAIT); 717 if (m == NULL) { 718 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 719 "%s: cannot get writable mbuf\n", __func__); 720 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 721 return NULL; 722 } 723 } 724 } 725 /* 726 * We know we are called just before stripping an Ethernet 727 * header and prepending an LLC header. This means we know 728 * there will be 729 * sizeof(struct ether_header) - sizeof(struct llc) 730 * bytes recovered to which we need additional space for the 731 * 802.11 header and any crypto header. 732 */ 733 /* XXX check trailing space and copy instead? */ 734 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 735 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 736 if (n == NULL) { 737 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 738 "%s: cannot expand storage\n", __func__); 739 vap->iv_stats.is_tx_nobuf++; 740 m_freem(m); 741 return NULL; 742 } 743 KASSERT(needed_space <= MHLEN, 744 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 745 /* 746 * Setup new mbuf to have leading space to prepend the 747 * 802.11 header and any crypto header bits that are 748 * required (the latter are added when the driver calls 749 * back to ieee80211_crypto_encap to do crypto encapsulation). 750 */ 751 /* NB: must be first 'cuz it clobbers m_data */ 752 m_move_pkthdr(n, m); 753 n->m_len = 0; /* NB: m_gethdr does not set */ 754 n->m_data += needed_space; 755 /* 756 * Pull up Ethernet header to create the expected layout. 757 * We could use m_pullup but that's overkill (i.e. we don't 758 * need the actual data) and it cannot fail so do it inline 759 * for speed. 760 */ 761 /* NB: struct ether_header is known to be contiguous */ 762 n->m_len += sizeof(struct ether_header); 763 m->m_len -= sizeof(struct ether_header); 764 m->m_data += sizeof(struct ether_header); 765 /* 766 * Replace the head of the chain. 767 */ 768 n->m_next = m; 769 m = n; 770 } 771 return m; 772#undef TO_BE_RECLAIMED 773} 774 775/* 776 * Return the transmit key to use in sending a unicast frame. 777 * If a unicast key is set we use that. When no unicast key is set 778 * we fall back to the default transmit key. 779 */ 780static __inline struct ieee80211_key * 781ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 782 struct ieee80211_node *ni) 783{ 784 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 785 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 786 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 787 return NULL; 788 return &vap->iv_nw_keys[vap->iv_def_txkey]; 789 } else { 790 return &ni->ni_ucastkey; 791 } 792} 793 794/* 795 * Return the transmit key to use in sending a multicast frame. 796 * Multicast traffic always uses the group key which is installed as 797 * the default tx key. 798 */ 799static __inline struct ieee80211_key * 800ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 801 struct ieee80211_node *ni) 802{ 803 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 804 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 805 return NULL; 806 return &vap->iv_nw_keys[vap->iv_def_txkey]; 807} 808 809/* 810 * Encapsulate an outbound data frame. The mbuf chain is updated. 811 * If an error is encountered NULL is returned. The caller is required 812 * to provide a node reference and pullup the ethernet header in the 813 * first mbuf. 814 * 815 * NB: Packet is assumed to be processed by ieee80211_classify which 816 * marked EAPOL frames w/ M_EAPOL. 817 */ 818struct mbuf * 819ieee80211_encap(struct ieee80211_node *ni, struct mbuf *m) 820{ 821#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 822 struct ieee80211vap *vap = ni->ni_vap; 823 struct ieee80211com *ic = ni->ni_ic; 824 struct ether_header eh; 825 struct ieee80211_frame *wh; 826 struct ieee80211_key *key; 827 struct llc *llc; 828 int hdrsize, hdrspace, datalen, addqos, txfrag, isff, is4addr; 829 830 /* 831 * Copy existing Ethernet header to a safe place. The 832 * rest of the code assumes it's ok to strip it when 833 * reorganizing state for the final encapsulation. 834 */ 835 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 836 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 837 838 /* 839 * Insure space for additional headers. First identify 840 * transmit key to use in calculating any buffer adjustments 841 * required. This is also used below to do privacy 842 * encapsulation work. Then calculate the 802.11 header 843 * size and any padding required by the driver. 844 * 845 * Note key may be NULL if we fall back to the default 846 * transmit key and that is not set. In that case the 847 * buffer may not be expanded as needed by the cipher 848 * routines, but they will/should discard it. 849 */ 850 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 851 if (vap->iv_opmode == IEEE80211_M_STA || 852 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 853 (vap->iv_opmode == IEEE80211_M_WDS && 854 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 855 key = ieee80211_crypto_getucastkey(vap, ni); 856 else 857 key = ieee80211_crypto_getmcastkey(vap, ni); 858 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 859 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 860 eh.ether_dhost, 861 "no default transmit key (%s) deftxkey %u", 862 __func__, vap->iv_def_txkey); 863 vap->iv_stats.is_tx_nodefkey++; 864 goto bad; 865 } 866 } else 867 key = NULL; 868 /* 869 * XXX Some ap's don't handle QoS-encapsulated EAPOL 870 * frames so suppress use. This may be an issue if other 871 * ap's require all data frames to be QoS-encapsulated 872 * once negotiated in which case we'll need to make this 873 * configurable. 874 */ 875 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 876 (m->m_flags & M_EAPOL) == 0; 877 if (addqos) 878 hdrsize = sizeof(struct ieee80211_qosframe); 879 else 880 hdrsize = sizeof(struct ieee80211_frame); 881 /* 882 * 4-address frames need to be generated for: 883 * o packets sent through a WDS vap (M_WDS || IEEE80211_M_WDS) 884 * o packets relayed by a station operating with dynamic WDS 885 * (IEEE80211_M_STA+IEEE80211_F_DWDS and src address) 886 */ 887 is4addr = (m->m_flags & M_WDS) || 888 vap->iv_opmode == IEEE80211_M_WDS || /* XXX redundant? */ 889 (vap->iv_opmode == IEEE80211_M_STA && 890 (vap->iv_flags & IEEE80211_F_DWDS) && 891 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 892 if (is4addr) 893 hdrsize += IEEE80211_ADDR_LEN; 894 /* 895 * Honor driver DATAPAD requirement. 896 */ 897 if (ic->ic_flags & IEEE80211_F_DATAPAD) 898 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 899 else 900 hdrspace = hdrsize; 901 902 if ((isff = m->m_flags & M_FF) != 0) { 903 struct mbuf *m2; 904 struct ether_header eh2; 905 906 /* 907 * Fast frame encapsulation. There must be two packets 908 * chained with m_nextpkt. We do header adjustment for 909 * each, add the tunnel encapsulation, and then concatenate 910 * the mbuf chains to form a single frame for transmission. 911 */ 912 m2 = m->m_nextpkt; 913 if (m2 == NULL) { 914 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 915 "%s: only one frame\n", __func__); 916 goto bad; 917 } 918 m->m_nextpkt = NULL; 919 /* 920 * Include fast frame headers in adjusting header 921 * layout; this allocates space according to what 922 * ieee80211_encap_fastframe will do. 923 */ 924 m = ieee80211_mbuf_adjust(vap, 925 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 926 sizeof(struct ether_header), 927 key, m); 928 if (m == NULL) { 929 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 930 m_freem(m2); 931 goto bad; 932 } 933 /* 934 * Copy second frame's Ethernet header out of line 935 * and adjust for encapsulation headers. Note that 936 * we make room for padding in case there isn't room 937 * at the end of first frame. 938 */ 939 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 940 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 941 m2 = ieee80211_mbuf_adjust(vap, 942 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 943 NULL, m2); 944 if (m2 == NULL) { 945 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 946 goto bad; 947 } 948 m = ieee80211_encap_fastframe(vap, m, &eh, m2, &eh2); 949 if (m == NULL) 950 goto bad; 951 } else { 952 /* 953 * Normal frame. 954 */ 955 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m); 956 if (m == NULL) { 957 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 958 goto bad; 959 } 960 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 961 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 962 llc = mtod(m, struct llc *); 963 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 964 llc->llc_control = LLC_UI; 965 llc->llc_snap.org_code[0] = 0; 966 llc->llc_snap.org_code[1] = 0; 967 llc->llc_snap.org_code[2] = 0; 968 llc->llc_snap.ether_type = eh.ether_type; 969 } 970 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 971 972 M_PREPEND(m, hdrspace, M_DONTWAIT); 973 if (m == NULL) { 974 vap->iv_stats.is_tx_nobuf++; 975 goto bad; 976 } 977 wh = mtod(m, struct ieee80211_frame *); 978 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 979 *(uint16_t *)wh->i_dur = 0; 980 if (is4addr) { 981 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 982 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 983 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 984 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 985 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 986 } else switch (vap->iv_opmode) { 987 case IEEE80211_M_STA: 988 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 989 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 990 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 991 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 992 break; 993 case IEEE80211_M_IBSS: 994 case IEEE80211_M_AHDEMO: 995 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 996 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 997 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 998 /* 999 * NB: always use the bssid from iv_bss as the 1000 * neighbor's may be stale after an ibss merge 1001 */ 1002 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1003 break; 1004 case IEEE80211_M_HOSTAP: 1005 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1006 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1007 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1008 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1009 break; 1010 case IEEE80211_M_MONITOR: 1011 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1012 goto bad; 1013 } 1014 if (m->m_flags & M_MORE_DATA) 1015 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1016 if (addqos) { 1017 uint8_t *qos; 1018 int ac, tid; 1019 1020 if (is4addr) { 1021 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1022 } else 1023 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1024 ac = M_WME_GETAC(m); 1025 /* map from access class/queue to 11e header priorty value */ 1026 tid = WME_AC_TO_TID(ac); 1027 qos[0] = tid & IEEE80211_QOS_TID; 1028 /* 1029 * Check if A-MPDU tx aggregation is setup or if we 1030 * should try to enable it. The sta must be associated 1031 * with HT and A-MPDU enabled for use. When the policy 1032 * routine decides we should enable A-MPDU we issue an 1033 * ADDBA request and wait for a reply. The frame being 1034 * encapsulated will go out w/o using A-MPDU, or possibly 1035 * it might be collected by the driver and held/retransmit. 1036 * The default ic_ampdu_enable routine handles staggering 1037 * ADDBA requests in case the receiver NAK's us or we are 1038 * otherwise unable to establish a BA stream. 1039 */ 1040 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 1041 (vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 1042 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 1043 1044 ieee80211_txampdu_count_packet(tap); 1045 if (IEEE80211_AMPDU_RUNNING(tap)) { 1046 /* 1047 * Operational, mark frame for aggregation. 1048 * 1049 * NB: We support only immediate BA's for 1050 * AMPDU which means we set the QoS control 1051 * field to "normal ack" (0) to get "implicit 1052 * block ack" behaviour. 1053 */ 1054 m->m_flags |= M_AMPDU_MPDU; 1055 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 1056 ic->ic_ampdu_enable(ni, tap)) { 1057 /* 1058 * Not negotiated yet, request service. 1059 */ 1060 ieee80211_ampdu_request(ni, tap); 1061 } 1062 } 1063 /* XXX works even when BA marked above */ 1064 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1065 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1066 qos[1] = 0; 1067 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1068 1069 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1070 /* 1071 * NB: don't assign a sequence # to potential 1072 * aggregates; we expect this happens at the 1073 * point the frame comes off any aggregation q 1074 * as otherwise we may introduce holes in the 1075 * BA sequence space and/or make window accouting 1076 * more difficult. 1077 * 1078 * XXX may want to control this with a driver 1079 * capability; this may also change when we pull 1080 * aggregation up into net80211 1081 */ 1082 *(uint16_t *)wh->i_seq = 1083 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 1084 ni->ni_txseqs[tid]++; 1085 } 1086 ni->ni_txseqs[tid]++; 1087 } else { 1088 *(uint16_t *)wh->i_seq = 1089 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 1090 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1091 } 1092 /* check if xmit fragmentation is required */ 1093 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1094 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1095 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1096 !isff); /* NB: don't fragment ff's */ 1097 if (key != NULL) { 1098 /* 1099 * IEEE 802.1X: send EAPOL frames always in the clear. 1100 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1101 */ 1102 if ((m->m_flags & M_EAPOL) == 0 || 1103 ((vap->iv_flags & IEEE80211_F_WPA) && 1104 (vap->iv_opmode == IEEE80211_M_STA ? 1105 !IEEE80211_KEY_UNDEFINED(key) : 1106 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1107 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1108 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1109 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1110 eh.ether_dhost, 1111 "%s", "enmic failed, discard frame"); 1112 vap->iv_stats.is_crypto_enmicfail++; 1113 goto bad; 1114 } 1115 } 1116 } 1117 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1118 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1119 goto bad; 1120 1121 IEEE80211_NODE_STAT(ni, tx_data); 1122 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 1123 IEEE80211_NODE_STAT(ni, tx_mcast); 1124 else 1125 IEEE80211_NODE_STAT(ni, tx_ucast); 1126 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1127 1128 /* XXX fragmented frames not handled */ 1129 if (bpf_peers_present(vap->iv_rawbpf)) 1130 bpf_mtap(vap->iv_rawbpf, m); 1131 1132 return m; 1133bad: 1134 if (m != NULL) 1135 m_freem(m); 1136 return NULL; 1137#undef WH4 1138} 1139 1140/* 1141 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1142 * tunnel encapsulation. The frame is assumed to have an Ethernet 1143 * header at the front that must be stripped before prepending the 1144 * LLC followed by the Ethernet header passed in (with an Ethernet 1145 * type that specifies the payload size). 1146 */ 1147static struct mbuf * 1148ieee80211_encap1(struct ieee80211vap *vap, struct mbuf *m, 1149 const struct ether_header *eh) 1150{ 1151 struct llc *llc; 1152 uint16_t payload; 1153 1154 /* XXX optimize by combining m_adj+M_PREPEND */ 1155 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1156 llc = mtod(m, struct llc *); 1157 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1158 llc->llc_control = LLC_UI; 1159 llc->llc_snap.org_code[0] = 0; 1160 llc->llc_snap.org_code[1] = 0; 1161 llc->llc_snap.org_code[2] = 0; 1162 llc->llc_snap.ether_type = eh->ether_type; 1163 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1164 1165 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1166 if (m == NULL) { /* XXX cannot happen */ 1167 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1168 "%s: no space for ether_header\n", __func__); 1169 vap->iv_stats.is_tx_nobuf++; 1170 return NULL; 1171 } 1172 ETHER_HEADER_COPY(mtod(m, void *), eh); 1173 mtod(m, struct ether_header *)->ether_type = htons(payload); 1174 return m; 1175} 1176 1177/* 1178 * Do fast frame tunnel encapsulation. The two frames and 1179 * Ethernet headers are supplied. The caller is assumed to 1180 * have arrange for space in the mbuf chains for encapsulating 1181 * headers (to avoid major mbuf fragmentation). 1182 * 1183 * The encapsulated frame is returned or NULL if there is a 1184 * problem (should not happen). 1185 */ 1186static struct mbuf * 1187ieee80211_encap_fastframe(struct ieee80211vap *vap, 1188 struct mbuf *m1, const struct ether_header *eh1, 1189 struct mbuf *m2, const struct ether_header *eh2) 1190{ 1191 struct llc *llc; 1192 struct mbuf *m; 1193 int pad; 1194 1195 /* 1196 * First, each frame gets a standard encapsulation. 1197 */ 1198 m1 = ieee80211_encap1(vap, m1, eh1); 1199 if (m1 == NULL) { 1200 m_freem(m2); 1201 return NULL; 1202 } 1203 m2 = ieee80211_encap1(vap, m2, eh2); 1204 if (m2 == NULL) { 1205 m_freem(m1); 1206 return NULL; 1207 } 1208 1209 /* 1210 * Pad leading frame to a 4-byte boundary. If there 1211 * is space at the end of the first frame, put it 1212 * there; otherwise prepend to the front of the second 1213 * frame. We know doing the second will always work 1214 * because we reserve space above. We prefer appending 1215 * as this typically has better DMA alignment properties. 1216 */ 1217 for (m = m1; m->m_next != NULL; m = m->m_next) 1218 ; 1219 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1220 if (pad) { 1221 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1222 m2->m_data -= pad; 1223 m2->m_len += pad; 1224 m2->m_pkthdr.len += pad; 1225 } else { /* append to first */ 1226 m->m_len += pad; 1227 m1->m_pkthdr.len += pad; 1228 } 1229 } 1230 1231 /* 1232 * Now, stick 'em together and prepend the tunnel headers; 1233 * first the Atheros tunnel header (all zero for now) and 1234 * then a special fast frame LLC. 1235 * 1236 * XXX optimize by prepending together 1237 */ 1238 m->m_next = m2; /* NB: last mbuf from above */ 1239 m1->m_pkthdr.len += m2->m_pkthdr.len; 1240 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1241 if (m1 == NULL) { /* XXX cannot happen */ 1242 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1243 "%s: no space for tunnel header\n", __func__); 1244 vap->iv_stats.is_tx_nobuf++; 1245 return NULL; 1246 } 1247 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1248 1249 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1250 if (m1 == NULL) { /* XXX cannot happen */ 1251 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 1252 "%s: no space for llc header\n", __func__); 1253 vap->iv_stats.is_tx_nobuf++; 1254 return NULL; 1255 } 1256 llc = mtod(m1, struct llc *); 1257 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1258 llc->llc_control = LLC_UI; 1259 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1260 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1261 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1262 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1263 1264 vap->iv_stats.is_ff_encap++; 1265 1266 return m1; 1267} 1268 1269/* 1270 * Fragment the frame according to the specified mtu. 1271 * The size of the 802.11 header (w/o padding) is provided 1272 * so we don't need to recalculate it. We create a new 1273 * mbuf for each fragment and chain it through m_nextpkt; 1274 * we might be able to optimize this by reusing the original 1275 * packet's mbufs but that is significantly more complicated. 1276 */ 1277static int 1278ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1279 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1280{ 1281 struct ieee80211_frame *wh, *whf; 1282 struct mbuf *m, *prev, *next; 1283 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1284 1285 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1286 KASSERT(m0->m_pkthdr.len > mtu, 1287 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1288 1289 wh = mtod(m0, struct ieee80211_frame *); 1290 /* NB: mark the first frag; it will be propagated below */ 1291 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1292 totalhdrsize = hdrsize + ciphdrsize; 1293 fragno = 1; 1294 off = mtu - ciphdrsize; 1295 remainder = m0->m_pkthdr.len - off; 1296 prev = m0; 1297 do { 1298 fragsize = totalhdrsize + remainder; 1299 if (fragsize > mtu) 1300 fragsize = mtu; 1301 /* XXX fragsize can be >2048! */ 1302 KASSERT(fragsize < MCLBYTES, 1303 ("fragment size %u too big!", fragsize)); 1304 if (fragsize > MHLEN) 1305 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1306 else 1307 m = m_gethdr(M_DONTWAIT, MT_DATA); 1308 if (m == NULL) 1309 goto bad; 1310 /* leave room to prepend any cipher header */ 1311 m_align(m, fragsize - ciphdrsize); 1312 1313 /* 1314 * Form the header in the fragment. Note that since 1315 * we mark the first fragment with the MORE_FRAG bit 1316 * it automatically is propagated to each fragment; we 1317 * need only clear it on the last fragment (done below). 1318 */ 1319 whf = mtod(m, struct ieee80211_frame *); 1320 memcpy(whf, wh, hdrsize); 1321 *(uint16_t *)&whf->i_seq[0] |= htole16( 1322 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1323 IEEE80211_SEQ_FRAG_SHIFT); 1324 fragno++; 1325 1326 payload = fragsize - totalhdrsize; 1327 /* NB: destination is known to be contiguous */ 1328 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1329 m->m_len = hdrsize + payload; 1330 m->m_pkthdr.len = hdrsize + payload; 1331 m->m_flags |= M_FRAG; 1332 1333 /* chain up the fragment */ 1334 prev->m_nextpkt = m; 1335 prev = m; 1336 1337 /* deduct fragment just formed */ 1338 remainder -= payload; 1339 off += payload; 1340 } while (remainder != 0); 1341 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1342 1343 /* strip first mbuf now that everything has been copied */ 1344 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1345 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1346 1347 vap->iv_stats.is_tx_fragframes++; 1348 vap->iv_stats.is_tx_frags += fragno-1; 1349 1350 return 1; 1351bad: 1352 /* reclaim fragments but leave original frame for caller to free */ 1353 for (m = m0->m_nextpkt; m != NULL; m = next) { 1354 next = m->m_nextpkt; 1355 m->m_nextpkt = NULL; /* XXX paranoid */ 1356 m_freem(m); 1357 } 1358 m0->m_nextpkt = NULL; 1359 return 0; 1360} 1361 1362/* 1363 * Add a supported rates element id to a frame. 1364 */ 1365static uint8_t * 1366ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1367{ 1368 int nrates; 1369 1370 *frm++ = IEEE80211_ELEMID_RATES; 1371 nrates = rs->rs_nrates; 1372 if (nrates > IEEE80211_RATE_SIZE) 1373 nrates = IEEE80211_RATE_SIZE; 1374 *frm++ = nrates; 1375 memcpy(frm, rs->rs_rates, nrates); 1376 return frm + nrates; 1377} 1378 1379/* 1380 * Add an extended supported rates element id to a frame. 1381 */ 1382static uint8_t * 1383ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1384{ 1385 /* 1386 * Add an extended supported rates element if operating in 11g mode. 1387 */ 1388 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1389 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1390 *frm++ = IEEE80211_ELEMID_XRATES; 1391 *frm++ = nrates; 1392 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1393 frm += nrates; 1394 } 1395 return frm; 1396} 1397 1398/* 1399 * Add an ssid element to a frame. 1400 */ 1401static uint8_t * 1402ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1403{ 1404 *frm++ = IEEE80211_ELEMID_SSID; 1405 *frm++ = len; 1406 memcpy(frm, ssid, len); 1407 return frm + len; 1408} 1409 1410/* 1411 * Add an erp element to a frame. 1412 */ 1413static uint8_t * 1414ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1415{ 1416 uint8_t erp; 1417 1418 *frm++ = IEEE80211_ELEMID_ERP; 1419 *frm++ = 1; 1420 erp = 0; 1421 if (ic->ic_nonerpsta != 0) 1422 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1423 if (ic->ic_flags & IEEE80211_F_USEPROT) 1424 erp |= IEEE80211_ERP_USE_PROTECTION; 1425 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1426 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1427 *frm++ = erp; 1428 return frm; 1429} 1430 1431/* 1432 * Add a CFParams element to a frame. 1433 */ 1434static uint8_t * 1435ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1436{ 1437#define ADDSHORT(frm, v) do { \ 1438 frm[0] = (v) & 0xff; \ 1439 frm[1] = (v) >> 8; \ 1440 frm += 2; \ 1441} while (0) 1442 *frm++ = IEEE80211_ELEMID_CFPARMS; 1443 *frm++ = 6; 1444 *frm++ = 0; /* CFP count */ 1445 *frm++ = 2; /* CFP period */ 1446 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1447 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1448 return frm; 1449#undef ADDSHORT 1450} 1451 1452static __inline uint8_t * 1453add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1454{ 1455 memcpy(frm, ie->ie_data, ie->ie_len); 1456 return frm + ie->ie_len; 1457} 1458 1459static __inline uint8_t * 1460add_ie(uint8_t *frm, const uint8_t *ie) 1461{ 1462 memcpy(frm, ie, 2 + ie[1]); 1463 return frm + 2 + ie[1]; 1464} 1465 1466#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1467/* 1468 * Add a WME information element to a frame. 1469 */ 1470static uint8_t * 1471ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1472{ 1473 static const struct ieee80211_wme_info info = { 1474 .wme_id = IEEE80211_ELEMID_VENDOR, 1475 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1476 .wme_oui = { WME_OUI_BYTES }, 1477 .wme_type = WME_OUI_TYPE, 1478 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1479 .wme_version = WME_VERSION, 1480 .wme_info = 0, 1481 }; 1482 memcpy(frm, &info, sizeof(info)); 1483 return frm + sizeof(info); 1484} 1485 1486/* 1487 * Add a WME parameters element to a frame. 1488 */ 1489static uint8_t * 1490ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1491{ 1492#define SM(_v, _f) (((_v) << _f##_S) & _f) 1493#define ADDSHORT(frm, v) do { \ 1494 frm[0] = (v) & 0xff; \ 1495 frm[1] = (v) >> 8; \ 1496 frm += 2; \ 1497} while (0) 1498 /* NB: this works 'cuz a param has an info at the front */ 1499 static const struct ieee80211_wme_info param = { 1500 .wme_id = IEEE80211_ELEMID_VENDOR, 1501 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1502 .wme_oui = { WME_OUI_BYTES }, 1503 .wme_type = WME_OUI_TYPE, 1504 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1505 .wme_version = WME_VERSION, 1506 }; 1507 int i; 1508 1509 memcpy(frm, ¶m, sizeof(param)); 1510 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1511 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1512 *frm++ = 0; /* reserved field */ 1513 for (i = 0; i < WME_NUM_AC; i++) { 1514 const struct wmeParams *ac = 1515 &wme->wme_bssChanParams.cap_wmeParams[i]; 1516 *frm++ = SM(i, WME_PARAM_ACI) 1517 | SM(ac->wmep_acm, WME_PARAM_ACM) 1518 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1519 ; 1520 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1521 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1522 ; 1523 ADDSHORT(frm, ac->wmep_txopLimit); 1524 } 1525 return frm; 1526#undef SM 1527#undef ADDSHORT 1528} 1529#undef WME_OUI_BYTES 1530 1531#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1532/* 1533 * Add a WME information element to a frame. 1534 */ 1535static uint8_t * 1536ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1537{ 1538 static const struct ieee80211_ath_ie info = { 1539 .ath_id = IEEE80211_ELEMID_VENDOR, 1540 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1541 .ath_oui = { ATH_OUI_BYTES }, 1542 .ath_oui_type = ATH_OUI_TYPE, 1543 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1544 .ath_version = ATH_OUI_VERSION, 1545 }; 1546 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1547 1548 memcpy(frm, &info, sizeof(info)); 1549 ath->ath_capability = caps; 1550 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1551 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1552 return frm + sizeof(info); 1553} 1554#undef ATH_OUI_BYTES 1555 1556/* 1557 * Add an 11h Power Constraint element to a frame. 1558 */ 1559static uint8_t * 1560ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1561{ 1562 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1563 /* XXX per-vap tx power limit? */ 1564 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1565 1566 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1567 frm[1] = 1; 1568 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1569 return frm + 3; 1570} 1571 1572/* 1573 * Add an 11h Power Capability element to a frame. 1574 */ 1575static uint8_t * 1576ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1577{ 1578 frm[0] = IEEE80211_ELEMID_PWRCAP; 1579 frm[1] = 2; 1580 frm[2] = c->ic_minpower; 1581 frm[3] = c->ic_maxpower; 1582 return frm + 4; 1583} 1584 1585/* 1586 * Add an 11h Supported Channels element to a frame. 1587 */ 1588static uint8_t * 1589ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1590{ 1591 static const int ielen = 26; 1592 1593 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1594 frm[1] = ielen; 1595 /* XXX not correct */ 1596 memcpy(frm+2, ic->ic_chan_avail, ielen); 1597 return frm + 2 + ielen; 1598} 1599 1600/* 1601 * Add an 11h Channel Switch Announcement element to a frame. 1602 * Note that we use the per-vap CSA count to adjust the global 1603 * counter so we can use this routine to form probe response 1604 * frames and get the current count. 1605 */ 1606static uint8_t * 1607ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1608{ 1609 struct ieee80211com *ic = vap->iv_ic; 1610 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1611 1612 csa->csa_ie = IEEE80211_ELEMID_CHANSWITCHANN; 1613 csa->csa_len = 3; 1614 csa->csa_mode = 1; /* XXX force quiet on channel */ 1615 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1616 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1617 return frm + sizeof(*csa); 1618} 1619 1620/* 1621 * Add an 11h country information element to a frame. 1622 */ 1623static uint8_t * 1624ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1625{ 1626 1627 if (ic->ic_countryie == NULL || 1628 ic->ic_countryie_chan != ic->ic_bsschan) { 1629 /* 1630 * Handle lazy construction of ie. This is done on 1631 * first use and after a channel change that requires 1632 * re-calculation. 1633 */ 1634 if (ic->ic_countryie != NULL) 1635 free(ic->ic_countryie, M_80211_NODE_IE); 1636 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1637 if (ic->ic_countryie == NULL) 1638 return frm; 1639 ic->ic_countryie_chan = ic->ic_bsschan; 1640 } 1641 return add_appie(frm, ic->ic_countryie); 1642} 1643 1644/* 1645 * Send a probe request frame with the specified ssid 1646 * and any optional information element data. 1647 */ 1648int 1649ieee80211_send_probereq(struct ieee80211_node *ni, 1650 const uint8_t sa[IEEE80211_ADDR_LEN], 1651 const uint8_t da[IEEE80211_ADDR_LEN], 1652 const uint8_t bssid[IEEE80211_ADDR_LEN], 1653 const uint8_t *ssid, size_t ssidlen) 1654{ 1655 struct ieee80211vap *vap = ni->ni_vap; 1656 struct ieee80211com *ic = ni->ni_ic; 1657 struct ieee80211_frame *wh; 1658 const struct ieee80211_rateset *rs; 1659 struct mbuf *m; 1660 uint8_t *frm; 1661 1662 if (vap->iv_state == IEEE80211_S_CAC) { 1663 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1664 "block %s frame in CAC state", "probe request"); 1665 vap->iv_stats.is_tx_badstate++; 1666 return EIO; /* XXX */ 1667 } 1668 1669 /* 1670 * Hold a reference on the node so it doesn't go away until after 1671 * the xmit is complete all the way in the driver. On error we 1672 * will remove our reference. 1673 */ 1674 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1675 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1676 __func__, __LINE__, 1677 ni, ether_sprintf(ni->ni_macaddr), 1678 ieee80211_node_refcnt(ni)+1); 1679 ieee80211_ref_node(ni); 1680 1681 /* 1682 * prreq frame format 1683 * [tlv] ssid 1684 * [tlv] supported rates 1685 * [tlv] RSN (optional) 1686 * [tlv] extended supported rates 1687 * [tlv] WPA (optional) 1688 * [tlv] user-specified ie's 1689 */ 1690 m = ieee80211_getmgtframe(&frm, 1691 ic->ic_headroom + sizeof(struct ieee80211_frame), 1692 2 + IEEE80211_NWID_LEN 1693 + 2 + IEEE80211_RATE_SIZE 1694 + sizeof(struct ieee80211_ie_wpa) 1695 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1696 + sizeof(struct ieee80211_ie_wpa) 1697 + (vap->iv_appie_probereq != NULL ? 1698 vap->iv_appie_probereq->ie_len : 0) 1699 ); 1700 if (m == NULL) { 1701 vap->iv_stats.is_tx_nobuf++; 1702 ieee80211_free_node(ni); 1703 return ENOMEM; 1704 } 1705 1706 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1707 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1708 frm = ieee80211_add_rates(frm, rs); 1709 if (vap->iv_flags & IEEE80211_F_WPA2) { 1710 if (vap->iv_rsn_ie != NULL) 1711 frm = add_ie(frm, vap->iv_rsn_ie); 1712 /* XXX else complain? */ 1713 } 1714 frm = ieee80211_add_xrates(frm, rs); 1715 if (vap->iv_flags & IEEE80211_F_WPA1) { 1716 if (vap->iv_wpa_ie != NULL) 1717 frm = add_ie(frm, vap->iv_wpa_ie); 1718 /* XXX else complain? */ 1719 } 1720 if (vap->iv_appie_probereq != NULL) 1721 frm = add_appie(frm, vap->iv_appie_probereq); 1722 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1723 1724 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1725 if (m == NULL) 1726 return ENOMEM; 1727 1728 wh = mtod(m, struct ieee80211_frame *); 1729 ieee80211_send_setup(ni, wh, 1730 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1731 sa, da, bssid); 1732 /* XXX power management? */ 1733 1734 M_WME_SETAC(m, WME_AC_BE); 1735 1736 IEEE80211_NODE_STAT(ni, tx_probereq); 1737 IEEE80211_NODE_STAT(ni, tx_mgmt); 1738 1739 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1740 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1741 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1742 ssidlen, ssid); 1743 1744 return ic->ic_raw_xmit(ni, m, NULL); 1745} 1746 1747/* 1748 * Calculate capability information for mgt frames. 1749 */ 1750static uint16_t 1751getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1752{ 1753 struct ieee80211com *ic = vap->iv_ic; 1754 uint16_t capinfo; 1755 1756 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1757 1758 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1759 capinfo = IEEE80211_CAPINFO_ESS; 1760 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1761 capinfo = IEEE80211_CAPINFO_IBSS; 1762 else 1763 capinfo = 0; 1764 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1765 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1766 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1767 IEEE80211_IS_CHAN_2GHZ(chan)) 1768 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1769 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1770 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1771 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1772 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1773 return capinfo; 1774} 1775 1776/* 1777 * Send a management frame. The node is for the destination (or ic_bss 1778 * when in station mode). Nodes other than ic_bss have their reference 1779 * count bumped to reflect our use for an indeterminant time. 1780 */ 1781int 1782ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1783{ 1784#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1785#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1786 struct ieee80211vap *vap = ni->ni_vap; 1787 struct ieee80211com *ic = ni->ni_ic; 1788 struct ieee80211_node *bss = vap->iv_bss; 1789 struct mbuf *m; 1790 uint8_t *frm; 1791 uint16_t capinfo; 1792 int has_challenge, is_shared_key, ret, status; 1793 1794 KASSERT(ni != NULL, ("null node")); 1795 1796 /* 1797 * Hold a reference on the node so it doesn't go away until after 1798 * the xmit is complete all the way in the driver. On error we 1799 * will remove our reference. 1800 */ 1801 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1802 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1803 __func__, __LINE__, 1804 ni, ether_sprintf(ni->ni_macaddr), 1805 ieee80211_node_refcnt(ni)+1); 1806 ieee80211_ref_node(ni); 1807 1808 switch (type) { 1809 1810 case IEEE80211_FC0_SUBTYPE_AUTH: 1811 status = arg >> 16; 1812 arg &= 0xffff; 1813 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1814 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1815 ni->ni_challenge != NULL); 1816 1817 /* 1818 * Deduce whether we're doing open authentication or 1819 * shared key authentication. We do the latter if 1820 * we're in the middle of a shared key authentication 1821 * handshake or if we're initiating an authentication 1822 * request and configured to use shared key. 1823 */ 1824 is_shared_key = has_challenge || 1825 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1826 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1827 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1828 1829 m = ieee80211_getmgtframe(&frm, 1830 ic->ic_headroom + sizeof(struct ieee80211_frame), 1831 3 * sizeof(uint16_t) 1832 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1833 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1834 ); 1835 if (m == NULL) 1836 senderr(ENOMEM, is_tx_nobuf); 1837 1838 ((uint16_t *)frm)[0] = 1839 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1840 : htole16(IEEE80211_AUTH_ALG_OPEN); 1841 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1842 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1843 1844 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1845 ((uint16_t *)frm)[3] = 1846 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1847 IEEE80211_ELEMID_CHALLENGE); 1848 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1849 IEEE80211_CHALLENGE_LEN); 1850 m->m_pkthdr.len = m->m_len = 1851 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1852 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1853 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1854 "request encrypt frame (%s)", __func__); 1855 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1856 } 1857 } else 1858 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1859 1860 /* XXX not right for shared key */ 1861 if (status == IEEE80211_STATUS_SUCCESS) 1862 IEEE80211_NODE_STAT(ni, tx_auth); 1863 else 1864 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1865 1866 if (vap->iv_opmode == IEEE80211_M_STA) 1867 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1868 (void *) vap->iv_state); 1869 break; 1870 1871 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1872 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1873 "send station deauthenticate (reason %d)", arg); 1874 m = ieee80211_getmgtframe(&frm, 1875 ic->ic_headroom + sizeof(struct ieee80211_frame), 1876 sizeof(uint16_t)); 1877 if (m == NULL) 1878 senderr(ENOMEM, is_tx_nobuf); 1879 *(uint16_t *)frm = htole16(arg); /* reason */ 1880 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1881 1882 IEEE80211_NODE_STAT(ni, tx_deauth); 1883 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1884 1885 ieee80211_node_unauthorize(ni); /* port closed */ 1886 break; 1887 1888 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1889 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1890 /* 1891 * asreq frame format 1892 * [2] capability information 1893 * [2] listen interval 1894 * [6*] current AP address (reassoc only) 1895 * [tlv] ssid 1896 * [tlv] supported rates 1897 * [tlv] extended supported rates 1898 * [4] power capability (optional) 1899 * [28] supported channels (optional) 1900 * [tlv] HT capabilities 1901 * [tlv] WME (optional) 1902 * [tlv] Vendor OUI HT capabilities (optional) 1903 * [tlv] Atheros capabilities (if negotiated) 1904 * [tlv] AppIE's (optional) 1905 */ 1906 m = ieee80211_getmgtframe(&frm, 1907 ic->ic_headroom + sizeof(struct ieee80211_frame), 1908 sizeof(uint16_t) 1909 + sizeof(uint16_t) 1910 + IEEE80211_ADDR_LEN 1911 + 2 + IEEE80211_NWID_LEN 1912 + 2 + IEEE80211_RATE_SIZE 1913 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1914 + 4 1915 + 2 + 26 1916 + sizeof(struct ieee80211_wme_info) 1917 + sizeof(struct ieee80211_ie_htcap) 1918 + 4 + sizeof(struct ieee80211_ie_htcap) 1919 + sizeof(struct ieee80211_ath_ie) 1920 + (vap->iv_appie_wpa != NULL ? 1921 vap->iv_appie_wpa->ie_len : 0) 1922 + (vap->iv_appie_assocreq != NULL ? 1923 vap->iv_appie_assocreq->ie_len : 0) 1924 ); 1925 if (m == NULL) 1926 senderr(ENOMEM, is_tx_nobuf); 1927 1928 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1929 ("wrong mode %u", vap->iv_opmode)); 1930 capinfo = IEEE80211_CAPINFO_ESS; 1931 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1932 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1933 /* 1934 * NB: Some 11a AP's reject the request when 1935 * short premable is set. 1936 */ 1937 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1938 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 1939 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1940 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1941 (ic->ic_caps & IEEE80211_C_SHSLOT)) 1942 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1943 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 1944 (vap->iv_flags & IEEE80211_F_DOTH)) 1945 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1946 *(uint16_t *)frm = htole16(capinfo); 1947 frm += 2; 1948 1949 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 1950 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 1951 bss->ni_intval)); 1952 frm += 2; 1953 1954 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1955 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 1956 frm += IEEE80211_ADDR_LEN; 1957 } 1958 1959 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 1960 frm = ieee80211_add_rates(frm, &ni->ni_rates); 1961 if (vap->iv_flags & IEEE80211_F_WPA2) { 1962 if (vap->iv_rsn_ie != NULL) 1963 frm = add_ie(frm, vap->iv_rsn_ie); 1964 /* XXX else complain? */ 1965 } 1966 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 1967 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 1968 frm = ieee80211_add_powercapability(frm, 1969 ic->ic_curchan); 1970 frm = ieee80211_add_supportedchannels(frm, ic); 1971 } 1972 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1973 ni->ni_ies.htcap_ie != NULL && 1974 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 1975 frm = ieee80211_add_htcap(frm, ni); 1976 if (vap->iv_flags & IEEE80211_F_WPA1) { 1977 if (vap->iv_wpa_ie != NULL) 1978 frm = add_ie(frm, vap->iv_wpa_ie); 1979 /* XXX else complain */ 1980 } 1981 if ((ic->ic_flags & IEEE80211_F_WME) && 1982 ni->ni_ies.wme_ie != NULL) 1983 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 1984 if ((vap->iv_flags_ext & IEEE80211_FEXT_HT) && 1985 ni->ni_ies.htcap_ie != NULL && 1986 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 1987 frm = ieee80211_add_htcap_vendor(frm, ni); 1988 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 1989 frm = ieee80211_add_ath(frm, 1990 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 1991 (vap->iv_flags & IEEE80211_F_WPA) == 0 && 1992 ni->ni_authmode != IEEE80211_AUTH_8021X && 1993 vap->iv_def_txkey != IEEE80211_KEYIX_NONE ? 1994 vap->iv_def_txkey : 0x7fff); 1995 if (vap->iv_appie_assocreq != NULL) 1996 frm = add_appie(frm, vap->iv_appie_assocreq); 1997 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1998 1999 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2000 (void *) vap->iv_state); 2001 break; 2002 2003 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2004 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2005 /* 2006 * asresp frame format 2007 * [2] capability information 2008 * [2] status 2009 * [2] association ID 2010 * [tlv] supported rates 2011 * [tlv] extended supported rates 2012 * [tlv] HT capabilities (standard, if STA enabled) 2013 * [tlv] HT information (standard, if STA enabled) 2014 * [tlv] WME (if configured and STA enabled) 2015 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2016 * [tlv] HT information (vendor OUI, if STA enabled) 2017 * [tlv] Atheros capabilities (if STA enabled) 2018 * [tlv] AppIE's (optional) 2019 */ 2020 m = ieee80211_getmgtframe(&frm, 2021 ic->ic_headroom + sizeof(struct ieee80211_frame), 2022 sizeof(uint16_t) 2023 + sizeof(uint16_t) 2024 + sizeof(uint16_t) 2025 + 2 + IEEE80211_RATE_SIZE 2026 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2027 + sizeof(struct ieee80211_ie_htcap) + 4 2028 + sizeof(struct ieee80211_ie_htinfo) + 4 2029 + sizeof(struct ieee80211_wme_param) 2030 + sizeof(struct ieee80211_ath_ie) 2031 + (vap->iv_appie_assocresp != NULL ? 2032 vap->iv_appie_assocresp->ie_len : 0) 2033 ); 2034 if (m == NULL) 2035 senderr(ENOMEM, is_tx_nobuf); 2036 2037 capinfo = getcapinfo(vap, bss->ni_chan); 2038 *(uint16_t *)frm = htole16(capinfo); 2039 frm += 2; 2040 2041 *(uint16_t *)frm = htole16(arg); /* status */ 2042 frm += 2; 2043 2044 if (arg == IEEE80211_STATUS_SUCCESS) { 2045 *(uint16_t *)frm = htole16(ni->ni_associd); 2046 IEEE80211_NODE_STAT(ni, tx_assoc); 2047 } else 2048 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2049 frm += 2; 2050 2051 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2052 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2053 /* NB: respond according to what we received */ 2054 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2055 frm = ieee80211_add_htcap(frm, ni); 2056 frm = ieee80211_add_htinfo(frm, ni); 2057 } 2058 if ((vap->iv_flags & IEEE80211_F_WME) && 2059 ni->ni_ies.wme_ie != NULL) 2060 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2061 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2062 frm = ieee80211_add_htcap_vendor(frm, ni); 2063 frm = ieee80211_add_htinfo_vendor(frm, ni); 2064 } 2065 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2066 frm = ieee80211_add_ath(frm, 2067 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2068 ni->ni_ath_defkeyix); 2069 if (vap->iv_appie_assocresp != NULL) 2070 frm = add_appie(frm, vap->iv_appie_assocresp); 2071 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2072 break; 2073 2074 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2075 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2076 "send station disassociate (reason %d)", arg); 2077 m = ieee80211_getmgtframe(&frm, 2078 ic->ic_headroom + sizeof(struct ieee80211_frame), 2079 sizeof(uint16_t)); 2080 if (m == NULL) 2081 senderr(ENOMEM, is_tx_nobuf); 2082 *(uint16_t *)frm = htole16(arg); /* reason */ 2083 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2084 2085 IEEE80211_NODE_STAT(ni, tx_disassoc); 2086 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2087 break; 2088 2089 default: 2090 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2091 "invalid mgmt frame type %u", type); 2092 senderr(EINVAL, is_tx_unknownmgt); 2093 /* NOTREACHED */ 2094 } 2095 2096 return ieee80211_mgmt_output(ni, m, type); 2097bad: 2098 ieee80211_free_node(ni); 2099 return ret; 2100#undef senderr 2101#undef HTFLAGS 2102} 2103 2104/* 2105 * Return an mbuf with a probe response frame in it. 2106 * Space is left to prepend and 802.11 header at the 2107 * front but it's left to the caller to fill in. 2108 */ 2109struct mbuf * 2110ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2111{ 2112 struct ieee80211vap *vap = bss->ni_vap; 2113 struct ieee80211com *ic = bss->ni_ic; 2114 const struct ieee80211_rateset *rs; 2115 struct mbuf *m; 2116 uint16_t capinfo; 2117 uint8_t *frm; 2118 2119 /* 2120 * probe response frame format 2121 * [8] time stamp 2122 * [2] beacon interval 2123 * [2] cabability information 2124 * [tlv] ssid 2125 * [tlv] supported rates 2126 * [tlv] parameter set (FH/DS) 2127 * [tlv] parameter set (IBSS) 2128 * [tlv] country (optional) 2129 * [3] power control (optional) 2130 * [5] channel switch announcement (CSA) (optional) 2131 * [tlv] extended rate phy (ERP) 2132 * [tlv] extended supported rates 2133 * [tlv] RSN (optional) 2134 * [tlv] HT capabilities 2135 * [tlv] HT information 2136 * [tlv] WPA (optional) 2137 * [tlv] WME (optional) 2138 * [tlv] Vendor OUI HT capabilities (optional) 2139 * [tlv] Vendor OUI HT information (optional) 2140 * [tlv] Atheros capabilities 2141 * [tlv] AppIE's (optional) 2142 */ 2143 m = ieee80211_getmgtframe(&frm, 2144 ic->ic_headroom + sizeof(struct ieee80211_frame), 2145 8 2146 + sizeof(uint16_t) 2147 + sizeof(uint16_t) 2148 + 2 + IEEE80211_NWID_LEN 2149 + 2 + IEEE80211_RATE_SIZE 2150 + 7 /* max(7,3) */ 2151 + IEEE80211_COUNTRY_MAX_SIZE 2152 + 3 2153 + sizeof(struct ieee80211_csa_ie) 2154 + 3 2155 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2156 + sizeof(struct ieee80211_ie_wpa) 2157 + sizeof(struct ieee80211_ie_htcap) 2158 + sizeof(struct ieee80211_ie_htinfo) 2159 + sizeof(struct ieee80211_ie_wpa) 2160 + sizeof(struct ieee80211_wme_param) 2161 + 4 + sizeof(struct ieee80211_ie_htcap) 2162 + 4 + sizeof(struct ieee80211_ie_htinfo) 2163 + sizeof(struct ieee80211_ath_ie) 2164 + (vap->iv_appie_proberesp != NULL ? 2165 vap->iv_appie_proberesp->ie_len : 0) 2166 ); 2167 if (m == NULL) { 2168 vap->iv_stats.is_tx_nobuf++; 2169 return NULL; 2170 } 2171 2172 memset(frm, 0, 8); /* timestamp should be filled later */ 2173 frm += 8; 2174 *(uint16_t *)frm = htole16(bss->ni_intval); 2175 frm += 2; 2176 capinfo = getcapinfo(vap, bss->ni_chan); 2177 *(uint16_t *)frm = htole16(capinfo); 2178 frm += 2; 2179 2180 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2181 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2182 frm = ieee80211_add_rates(frm, rs); 2183 2184 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2185 *frm++ = IEEE80211_ELEMID_FHPARMS; 2186 *frm++ = 5; 2187 *frm++ = bss->ni_fhdwell & 0x00ff; 2188 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2189 *frm++ = IEEE80211_FH_CHANSET( 2190 ieee80211_chan2ieee(ic, bss->ni_chan)); 2191 *frm++ = IEEE80211_FH_CHANPAT( 2192 ieee80211_chan2ieee(ic, bss->ni_chan)); 2193 *frm++ = bss->ni_fhindex; 2194 } else { 2195 *frm++ = IEEE80211_ELEMID_DSPARMS; 2196 *frm++ = 1; 2197 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2198 } 2199 2200 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2201 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2202 *frm++ = 2; 2203 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2204 } 2205 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2206 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2207 frm = ieee80211_add_countryie(frm, ic); 2208 if (vap->iv_flags & IEEE80211_F_DOTH) { 2209 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2210 frm = ieee80211_add_powerconstraint(frm, vap); 2211 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2212 frm = ieee80211_add_csa(frm, vap); 2213 } 2214 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2215 frm = ieee80211_add_erp(frm, ic); 2216 frm = ieee80211_add_xrates(frm, rs); 2217 if (vap->iv_flags & IEEE80211_F_WPA2) { 2218 if (vap->iv_rsn_ie != NULL) 2219 frm = add_ie(frm, vap->iv_rsn_ie); 2220 /* XXX else complain? */ 2221 } 2222 /* 2223 * NB: legacy 11b clients do not get certain ie's. 2224 * The caller identifies such clients by passing 2225 * a token in legacy to us. Could expand this to be 2226 * any legacy client for stuff like HT ie's. 2227 */ 2228 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2229 legacy != IEEE80211_SEND_LEGACY_11B) { 2230 frm = ieee80211_add_htcap(frm, bss); 2231 frm = ieee80211_add_htinfo(frm, bss); 2232 } 2233 if (vap->iv_flags & IEEE80211_F_WPA1) { 2234 if (vap->iv_wpa_ie != NULL) 2235 frm = add_ie(frm, vap->iv_wpa_ie); 2236 /* XXX else complain? */ 2237 } 2238 if (vap->iv_flags & IEEE80211_F_WME) 2239 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2240 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2241 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 2242 legacy != IEEE80211_SEND_LEGACY_11B) { 2243 frm = ieee80211_add_htcap_vendor(frm, bss); 2244 frm = ieee80211_add_htinfo_vendor(frm, bss); 2245 } 2246 if (bss->ni_ies.ath_ie != NULL && legacy != IEEE80211_SEND_LEGACY_11B) 2247 frm = ieee80211_add_ath(frm, bss->ni_ath_flags, 2248 bss->ni_ath_defkeyix); 2249 if (vap->iv_appie_proberesp != NULL) 2250 frm = add_appie(frm, vap->iv_appie_proberesp); 2251 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2252 2253 return m; 2254} 2255 2256/* 2257 * Send a probe response frame to the specified mac address. 2258 * This does not go through the normal mgt frame api so we 2259 * can specify the destination address and re-use the bss node 2260 * for the sta reference. 2261 */ 2262int 2263ieee80211_send_proberesp(struct ieee80211vap *vap, 2264 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2265{ 2266 struct ieee80211_node *bss = vap->iv_bss; 2267 struct ieee80211com *ic = vap->iv_ic; 2268 struct ieee80211_frame *wh; 2269 struct mbuf *m; 2270 2271 if (vap->iv_state == IEEE80211_S_CAC) { 2272 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2273 "block %s frame in CAC state", "probe response"); 2274 vap->iv_stats.is_tx_badstate++; 2275 return EIO; /* XXX */ 2276 } 2277 2278 /* 2279 * Hold a reference on the node so it doesn't go away until after 2280 * the xmit is complete all the way in the driver. On error we 2281 * will remove our reference. 2282 */ 2283 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2284 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2285 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2286 ieee80211_node_refcnt(bss)+1); 2287 ieee80211_ref_node(bss); 2288 2289 m = ieee80211_alloc_proberesp(bss, legacy); 2290 if (m == NULL) { 2291 ieee80211_free_node(bss); 2292 return ENOMEM; 2293 } 2294 2295 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2296 KASSERT(m != NULL, ("no room for header")); 2297 2298 wh = mtod(m, struct ieee80211_frame *); 2299 ieee80211_send_setup(bss, wh, 2300 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2301 vap->iv_myaddr, da, bss->ni_bssid); 2302 /* XXX power management? */ 2303 2304 M_WME_SETAC(m, WME_AC_BE); 2305 2306 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2307 "send probe resp on channel %u to %s%s\n", 2308 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2309 legacy ? " <legacy>" : ""); 2310 IEEE80211_NODE_STAT(bss, tx_mgmt); 2311 2312 return ic->ic_raw_xmit(bss, m, NULL); 2313} 2314 2315/* 2316 * Allocate and build a RTS (Request To Send) control frame. 2317 */ 2318struct mbuf * 2319ieee80211_alloc_rts(struct ieee80211com *ic, 2320 const uint8_t ra[IEEE80211_ADDR_LEN], 2321 const uint8_t ta[IEEE80211_ADDR_LEN], 2322 uint16_t dur) 2323{ 2324 struct ieee80211_frame_rts *rts; 2325 struct mbuf *m; 2326 2327 /* XXX honor ic_headroom */ 2328 m = m_gethdr(M_DONTWAIT, MT_DATA); 2329 if (m != NULL) { 2330 rts = mtod(m, struct ieee80211_frame_rts *); 2331 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2332 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2333 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2334 *(u_int16_t *)rts->i_dur = htole16(dur); 2335 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2336 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2337 2338 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2339 } 2340 return m; 2341} 2342 2343/* 2344 * Allocate and build a CTS (Clear To Send) control frame. 2345 */ 2346struct mbuf * 2347ieee80211_alloc_cts(struct ieee80211com *ic, 2348 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2349{ 2350 struct ieee80211_frame_cts *cts; 2351 struct mbuf *m; 2352 2353 /* XXX honor ic_headroom */ 2354 m = m_gethdr(M_DONTWAIT, MT_DATA); 2355 if (m != NULL) { 2356 cts = mtod(m, struct ieee80211_frame_cts *); 2357 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2358 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2359 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2360 *(u_int16_t *)cts->i_dur = htole16(dur); 2361 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2362 2363 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2364 } 2365 return m; 2366} 2367 2368static void 2369ieee80211_tx_mgt_timeout(void *arg) 2370{ 2371 struct ieee80211_node *ni = arg; 2372 struct ieee80211vap *vap = ni->ni_vap; 2373 2374 if (vap->iv_state != IEEE80211_S_INIT && 2375 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2376 /* 2377 * NB: it's safe to specify a timeout as the reason here; 2378 * it'll only be used in the right state. 2379 */ 2380 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2381 IEEE80211_SCAN_FAIL_TIMEOUT); 2382 } 2383} 2384 2385static void 2386ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2387{ 2388 struct ieee80211vap *vap = ni->ni_vap; 2389 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2390 2391 /* 2392 * Frame transmit completed; arrange timer callback. If 2393 * transmit was successfuly we wait for response. Otherwise 2394 * we arrange an immediate callback instead of doing the 2395 * callback directly since we don't know what state the driver 2396 * is in (e.g. what locks it is holding). This work should 2397 * not be too time-critical and not happen too often so the 2398 * added overhead is acceptable. 2399 * 2400 * XXX what happens if !acked but response shows up before callback? 2401 */ 2402 if (vap->iv_state == ostate) 2403 callout_reset(&vap->iv_mgtsend, 2404 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2405 ieee80211_tx_mgt_timeout, ni); 2406} 2407 2408static void 2409ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2410 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2411{ 2412 struct ieee80211vap *vap = ni->ni_vap; 2413 struct ieee80211com *ic = ni->ni_ic; 2414 struct ieee80211_rateset *rs = &ni->ni_rates; 2415 uint16_t capinfo; 2416 2417 /* 2418 * beacon frame format 2419 * [8] time stamp 2420 * [2] beacon interval 2421 * [2] cabability information 2422 * [tlv] ssid 2423 * [tlv] supported rates 2424 * [3] parameter set (DS) 2425 * [8] CF parameter set (optional) 2426 * [tlv] parameter set (IBSS/TIM) 2427 * [tlv] country (optional) 2428 * [3] power control (optional) 2429 * [5] channel switch announcement (CSA) (optional) 2430 * [tlv] extended rate phy (ERP) 2431 * [tlv] extended supported rates 2432 * [tlv] RSN parameters 2433 * [tlv] HT capabilities 2434 * [tlv] HT information 2435 * XXX Vendor-specific OIDs (e.g. Atheros) 2436 * [tlv] WPA parameters 2437 * [tlv] WME parameters 2438 * [tlv] Vendor OUI HT capabilities (optional) 2439 * [tlv] Vendor OUI HT information (optional) 2440 * [tlv] application data (optional) 2441 */ 2442 2443 memset(bo, 0, sizeof(*bo)); 2444 2445 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2446 frm += 8; 2447 *(uint16_t *)frm = htole16(ni->ni_intval); 2448 frm += 2; 2449 capinfo = getcapinfo(vap, ni->ni_chan); 2450 bo->bo_caps = (uint16_t *)frm; 2451 *(uint16_t *)frm = htole16(capinfo); 2452 frm += 2; 2453 *frm++ = IEEE80211_ELEMID_SSID; 2454 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2455 *frm++ = ni->ni_esslen; 2456 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2457 frm += ni->ni_esslen; 2458 } else 2459 *frm++ = 0; 2460 frm = ieee80211_add_rates(frm, rs); 2461 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2462 *frm++ = IEEE80211_ELEMID_DSPARMS; 2463 *frm++ = 1; 2464 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2465 } 2466 if (ic->ic_flags & IEEE80211_F_PCF) { 2467 bo->bo_cfp = frm; 2468 frm = ieee80211_add_cfparms(frm, ic); 2469 } 2470 bo->bo_tim = frm; 2471 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2472 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2473 *frm++ = 2; 2474 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2475 bo->bo_tim_len = 0; 2476 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 2477 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2478 2479 tie->tim_ie = IEEE80211_ELEMID_TIM; 2480 tie->tim_len = 4; /* length */ 2481 tie->tim_count = 0; /* DTIM count */ 2482 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2483 tie->tim_bitctl = 0; /* bitmap control */ 2484 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2485 frm += sizeof(struct ieee80211_tim_ie); 2486 bo->bo_tim_len = 1; 2487 } 2488 bo->bo_tim_trailer = frm; 2489 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2490 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2491 frm = ieee80211_add_countryie(frm, ic); 2492 if (vap->iv_flags & IEEE80211_F_DOTH) { 2493 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2494 frm = ieee80211_add_powerconstraint(frm, vap); 2495 bo->bo_csa = frm; 2496 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2497 frm = ieee80211_add_csa(frm, vap); 2498 } else 2499 bo->bo_csa = frm; 2500 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2501 bo->bo_erp = frm; 2502 frm = ieee80211_add_erp(frm, ic); 2503 } 2504 frm = ieee80211_add_xrates(frm, rs); 2505 if (vap->iv_flags & IEEE80211_F_WPA2) { 2506 if (vap->iv_rsn_ie != NULL) 2507 frm = add_ie(frm, vap->iv_rsn_ie); 2508 /* XXX else complain */ 2509 } 2510 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2511 frm = ieee80211_add_htcap(frm, ni); 2512 bo->bo_htinfo = frm; 2513 frm = ieee80211_add_htinfo(frm, ni); 2514 } 2515 if (vap->iv_flags & IEEE80211_F_WPA1) { 2516 if (vap->iv_wpa_ie != NULL) 2517 frm = add_ie(frm, vap->iv_wpa_ie); 2518 /* XXX else complain */ 2519 } 2520 if (vap->iv_flags & IEEE80211_F_WME) { 2521 bo->bo_wme = frm; 2522 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2523 } 2524 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2525 (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2526 frm = ieee80211_add_htcap_vendor(frm, ni); 2527 frm = ieee80211_add_htinfo_vendor(frm, ni); 2528 } 2529 if (vap->iv_appie_beacon != NULL) { 2530 bo->bo_appie = frm; 2531 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2532 frm = add_appie(frm, vap->iv_appie_beacon); 2533 } 2534 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2535 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2536 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2537} 2538 2539/* 2540 * Allocate a beacon frame and fillin the appropriate bits. 2541 */ 2542struct mbuf * 2543ieee80211_beacon_alloc(struct ieee80211_node *ni, 2544 struct ieee80211_beacon_offsets *bo) 2545{ 2546 struct ieee80211vap *vap = ni->ni_vap; 2547 struct ieee80211com *ic = ni->ni_ic; 2548 struct ifnet *ifp = vap->iv_ifp; 2549 struct ieee80211_frame *wh; 2550 struct mbuf *m; 2551 int pktlen; 2552 uint8_t *frm; 2553 2554 /* 2555 * beacon frame format 2556 * [8] time stamp 2557 * [2] beacon interval 2558 * [2] cabability information 2559 * [tlv] ssid 2560 * [tlv] supported rates 2561 * [3] parameter set (DS) 2562 * [8] CF parameter set (optional) 2563 * [tlv] parameter set (IBSS/TIM) 2564 * [tlv] country (optional) 2565 * [3] power control (optional) 2566 * [5] channel switch announcement (CSA) (optional) 2567 * [tlv] extended rate phy (ERP) 2568 * [tlv] extended supported rates 2569 * [tlv] RSN parameters 2570 * [tlv] HT capabilities 2571 * [tlv] HT information 2572 * [tlv] Vendor OUI HT capabilities (optional) 2573 * [tlv] Vendor OUI HT information (optional) 2574 * XXX Vendor-specific OIDs (e.g. Atheros) 2575 * [tlv] WPA parameters 2576 * [tlv] WME parameters 2577 * [tlv] application data (optional) 2578 * NB: we allocate the max space required for the TIM bitmap. 2579 * XXX how big is this? 2580 */ 2581 pktlen = 8 /* time stamp */ 2582 + sizeof(uint16_t) /* beacon interval */ 2583 + sizeof(uint16_t) /* capabilities */ 2584 + 2 + ni->ni_esslen /* ssid */ 2585 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2586 + 2 + 1 /* DS parameters */ 2587 + 2 + 6 /* CF parameters */ 2588 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2589 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2590 + 2 + 1 /* power control */ 2591 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2592 + 2 + 1 /* ERP */ 2593 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2594 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2595 2*sizeof(struct ieee80211_ie_wpa) : 0) 2596 /* XXX conditional? */ 2597 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2598 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2599 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2600 sizeof(struct ieee80211_wme_param) : 0) 2601 + IEEE80211_MAX_APPIE 2602 ; 2603 m = ieee80211_getmgtframe(&frm, 2604 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2605 if (m == NULL) { 2606 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2607 "%s: cannot get buf; size %u\n", __func__, pktlen); 2608 vap->iv_stats.is_tx_nobuf++; 2609 return NULL; 2610 } 2611 ieee80211_beacon_construct(m, frm, bo, ni); 2612 2613 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2614 KASSERT(m != NULL, ("no space for 802.11 header?")); 2615 wh = mtod(m, struct ieee80211_frame *); 2616 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2617 IEEE80211_FC0_SUBTYPE_BEACON; 2618 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2619 *(uint16_t *)wh->i_dur = 0; 2620 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2621 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2622 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2623 *(uint16_t *)wh->i_seq = 0; 2624 2625 return m; 2626} 2627 2628/* 2629 * Update the dynamic parts of a beacon frame based on the current state. 2630 */ 2631int 2632ieee80211_beacon_update(struct ieee80211_node *ni, 2633 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2634{ 2635 struct ieee80211vap *vap = ni->ni_vap; 2636 struct ieee80211com *ic = ni->ni_ic; 2637 int len_changed = 0; 2638 uint16_t capinfo; 2639 2640 IEEE80211_LOCK(ic); 2641 /* 2642 * Handle 11h channel change when we've reached the count. 2643 * We must recalculate the beacon frame contents to account 2644 * for the new channel. Note we do this only for the first 2645 * vap that reaches this point; subsequent vaps just update 2646 * their beacon state to reflect the recalculated channel. 2647 */ 2648 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2649 vap->iv_csa_count == ic->ic_csa_count) { 2650 vap->iv_csa_count = 0; 2651 /* 2652 * Effect channel change before reconstructing the beacon 2653 * frame contents as many places reference ni_chan. 2654 */ 2655 if (ic->ic_csa_newchan != NULL) 2656 ieee80211_csa_completeswitch(ic); 2657 /* 2658 * NB: ieee80211_beacon_construct clears all pending 2659 * updates in bo_flags so we don't need to explicitly 2660 * clear IEEE80211_BEACON_CSA. 2661 */ 2662 ieee80211_beacon_construct(m, 2663 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2664 2665 /* XXX do WME aggressive mode processing? */ 2666 IEEE80211_UNLOCK(ic); 2667 return 1; /* just assume length changed */ 2668 } 2669 2670 /* XXX faster to recalculate entirely or just changes? */ 2671 capinfo = getcapinfo(vap, ni->ni_chan); 2672 *bo->bo_caps = htole16(capinfo); 2673 2674 if (vap->iv_flags & IEEE80211_F_WME) { 2675 struct ieee80211_wme_state *wme = &ic->ic_wme; 2676 2677 /* 2678 * Check for agressive mode change. When there is 2679 * significant high priority traffic in the BSS 2680 * throttle back BE traffic by using conservative 2681 * parameters. Otherwise BE uses agressive params 2682 * to optimize performance of legacy/non-QoS traffic. 2683 */ 2684 if (wme->wme_flags & WME_F_AGGRMODE) { 2685 if (wme->wme_hipri_traffic > 2686 wme->wme_hipri_switch_thresh) { 2687 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2688 "%s: traffic %u, disable aggressive mode\n", 2689 __func__, wme->wme_hipri_traffic); 2690 wme->wme_flags &= ~WME_F_AGGRMODE; 2691 ieee80211_wme_updateparams_locked(vap); 2692 wme->wme_hipri_traffic = 2693 wme->wme_hipri_switch_hysteresis; 2694 } else 2695 wme->wme_hipri_traffic = 0; 2696 } else { 2697 if (wme->wme_hipri_traffic <= 2698 wme->wme_hipri_switch_thresh) { 2699 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2700 "%s: traffic %u, enable aggressive mode\n", 2701 __func__, wme->wme_hipri_traffic); 2702 wme->wme_flags |= WME_F_AGGRMODE; 2703 ieee80211_wme_updateparams_locked(vap); 2704 wme->wme_hipri_traffic = 0; 2705 } else 2706 wme->wme_hipri_traffic = 2707 wme->wme_hipri_switch_hysteresis; 2708 } 2709 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2710 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2711 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2712 } 2713 } 2714 2715 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2716 ieee80211_ht_update_beacon(vap, bo); 2717 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2718 } 2719 2720 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2721 struct ieee80211_tim_ie *tie = 2722 (struct ieee80211_tim_ie *) bo->bo_tim; 2723 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2724 u_int timlen, timoff, i; 2725 /* 2726 * ATIM/DTIM needs updating. If it fits in the 2727 * current space allocated then just copy in the 2728 * new bits. Otherwise we need to move any trailing 2729 * data to make room. Note that we know there is 2730 * contiguous space because ieee80211_beacon_allocate 2731 * insures there is space in the mbuf to write a 2732 * maximal-size virtual bitmap (based on iv_max_aid). 2733 */ 2734 /* 2735 * Calculate the bitmap size and offset, copy any 2736 * trailer out of the way, and then copy in the 2737 * new bitmap and update the information element. 2738 * Note that the tim bitmap must contain at least 2739 * one byte and any offset must be even. 2740 */ 2741 if (vap->iv_ps_pending != 0) { 2742 timoff = 128; /* impossibly large */ 2743 for (i = 0; i < vap->iv_tim_len; i++) 2744 if (vap->iv_tim_bitmap[i]) { 2745 timoff = i &~ 1; 2746 break; 2747 } 2748 KASSERT(timoff != 128, ("tim bitmap empty!")); 2749 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2750 if (vap->iv_tim_bitmap[i]) 2751 break; 2752 timlen = 1 + (i - timoff); 2753 } else { 2754 timoff = 0; 2755 timlen = 1; 2756 } 2757 if (timlen != bo->bo_tim_len) { 2758 /* copy up/down trailer */ 2759 int adjust = tie->tim_bitmap+timlen 2760 - bo->bo_tim_trailer; 2761 ovbcopy(bo->bo_tim_trailer, 2762 bo->bo_tim_trailer+adjust, 2763 bo->bo_tim_trailer_len); 2764 bo->bo_tim_trailer += adjust; 2765 bo->bo_erp += adjust; 2766 bo->bo_htinfo += adjust; 2767 bo->bo_appie += adjust; 2768 bo->bo_wme += adjust; 2769 bo->bo_csa += adjust; 2770 bo->bo_tim_len = timlen; 2771 2772 /* update information element */ 2773 tie->tim_len = 3 + timlen; 2774 tie->tim_bitctl = timoff; 2775 len_changed = 1; 2776 } 2777 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2778 bo->bo_tim_len); 2779 2780 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2781 2782 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2783 "%s: TIM updated, pending %u, off %u, len %u\n", 2784 __func__, vap->iv_ps_pending, timoff, timlen); 2785 } 2786 /* count down DTIM period */ 2787 if (tie->tim_count == 0) 2788 tie->tim_count = tie->tim_period - 1; 2789 else 2790 tie->tim_count--; 2791 /* update state for buffered multicast frames on DTIM */ 2792 if (mcast && tie->tim_count == 0) 2793 tie->tim_bitctl |= 1; 2794 else 2795 tie->tim_bitctl &= ~1; 2796 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2797 struct ieee80211_csa_ie *csa = 2798 (struct ieee80211_csa_ie *) bo->bo_csa; 2799 2800 /* 2801 * Insert or update CSA ie. If we're just starting 2802 * to count down to the channel switch then we need 2803 * to insert the CSA ie. Otherwise we just need to 2804 * drop the count. The actual change happens above 2805 * when the vap's count reaches the target count. 2806 */ 2807 if (vap->iv_csa_count == 0) { 2808 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2809 bo->bo_erp += sizeof(*csa); 2810 bo->bo_wme += sizeof(*csa); 2811 bo->bo_appie += sizeof(*csa); 2812 bo->bo_csa_trailer_len += sizeof(*csa); 2813 bo->bo_tim_trailer_len += sizeof(*csa); 2814 m->m_len += sizeof(*csa); 2815 m->m_pkthdr.len += sizeof(*csa); 2816 2817 ieee80211_add_csa(bo->bo_csa, vap); 2818 } else 2819 csa->csa_count--; 2820 vap->iv_csa_count++; 2821 /* NB: don't clear IEEE80211_BEACON_CSA */ 2822 } 2823 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2824 /* 2825 * ERP element needs updating. 2826 */ 2827 (void) ieee80211_add_erp(bo->bo_erp, ic); 2828 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2829 } 2830 } 2831 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2832 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2833 int aielen; 2834 uint8_t *frm; 2835 2836 aielen = 0; 2837 if (aie != NULL) 2838 aielen += aie->ie_len; 2839 if (aielen != bo->bo_appie_len) { 2840 /* copy up/down trailer */ 2841 int adjust = aielen - bo->bo_appie_len; 2842 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 2843 bo->bo_tim_trailer_len); 2844 bo->bo_tim_trailer += adjust; 2845 bo->bo_appie += adjust; 2846 bo->bo_appie_len = aielen; 2847 2848 len_changed = 1; 2849 } 2850 frm = bo->bo_appie; 2851 if (aie != NULL) 2852 frm = add_appie(frm, aie); 2853 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 2854 } 2855 IEEE80211_UNLOCK(ic); 2856 2857 return len_changed; 2858} 2859