ieee80211_output.c revision 232097
1/*- 2 * Copyright (c) 2001 Atsushi Onoe 3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_output.c 232097 2012-02-24 05:40:36Z adrian $"); 29 30#include "opt_inet.h" 31#include "opt_inet6.h" 32#include "opt_wlan.h" 33 34#include <sys/param.h> 35#include <sys/systm.h> 36#include <sys/mbuf.h> 37#include <sys/kernel.h> 38#include <sys/endian.h> 39 40#include <sys/socket.h> 41 42#include <net/bpf.h> 43#include <net/ethernet.h> 44#include <net/if.h> 45#include <net/if_llc.h> 46#include <net/if_media.h> 47#include <net/if_vlan_var.h> 48 49#include <net80211/ieee80211_var.h> 50#include <net80211/ieee80211_regdomain.h> 51#ifdef IEEE80211_SUPPORT_SUPERG 52#include <net80211/ieee80211_superg.h> 53#endif 54#ifdef IEEE80211_SUPPORT_TDMA 55#include <net80211/ieee80211_tdma.h> 56#endif 57#include <net80211/ieee80211_wds.h> 58#include <net80211/ieee80211_mesh.h> 59 60#if defined(INET) || defined(INET6) 61#include <netinet/in.h> 62#endif 63 64#ifdef INET 65#include <netinet/if_ether.h> 66#include <netinet/in_systm.h> 67#include <netinet/ip.h> 68#endif 69#ifdef INET6 70#include <netinet/ip6.h> 71#endif 72 73#include <security/mac/mac_framework.h> 74 75#define ETHER_HEADER_COPY(dst, src) \ 76 memcpy(dst, src, sizeof(struct ether_header)) 77 78/* unalligned little endian access */ 79#define LE_WRITE_2(p, v) do { \ 80 ((uint8_t *)(p))[0] = (v) & 0xff; \ 81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 82} while (0) 83#define LE_WRITE_4(p, v) do { \ 84 ((uint8_t *)(p))[0] = (v) & 0xff; \ 85 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 86 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 87 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 88} while (0) 89 90static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 91 u_int hdrsize, u_int ciphdrsize, u_int mtu); 92static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 93 94#ifdef IEEE80211_DEBUG 95/* 96 * Decide if an outbound management frame should be 97 * printed when debugging is enabled. This filters some 98 * of the less interesting frames that come frequently 99 * (e.g. beacons). 100 */ 101static __inline int 102doprint(struct ieee80211vap *vap, int subtype) 103{ 104 switch (subtype) { 105 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 106 return (vap->iv_opmode == IEEE80211_M_IBSS); 107 } 108 return 1; 109} 110#endif 111 112/* 113 * Start method for vap's. All packets from the stack come 114 * through here. We handle common processing of the packets 115 * before dispatching them to the underlying device. 116 */ 117void 118ieee80211_start(struct ifnet *ifp) 119{ 120#define IS_DWDS(vap) \ 121 (vap->iv_opmode == IEEE80211_M_WDS && \ 122 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 123 struct ieee80211vap *vap = ifp->if_softc; 124 struct ieee80211com *ic = vap->iv_ic; 125 struct ifnet *parent = ic->ic_ifp; 126 struct ieee80211_node *ni; 127 struct mbuf *m; 128 struct ether_header *eh; 129 int error; 130 131 /* NB: parent must be up and running */ 132 if (!IFNET_IS_UP_RUNNING(parent)) { 133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 134 "%s: ignore queue, parent %s not up+running\n", 135 __func__, parent->if_xname); 136 /* XXX stat */ 137 return; 138 } 139 if (vap->iv_state == IEEE80211_S_SLEEP) { 140 /* 141 * In power save, wakeup device for transmit. 142 */ 143 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 144 return; 145 } 146 /* 147 * No data frames go out unless we're running. 148 * Note in particular this covers CAC and CSA 149 * states (though maybe we should check muting 150 * for CSA). 151 */ 152 if (vap->iv_state != IEEE80211_S_RUN) { 153 IEEE80211_LOCK(ic); 154 /* re-check under the com lock to avoid races */ 155 if (vap->iv_state != IEEE80211_S_RUN) { 156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 157 "%s: ignore queue, in %s state\n", 158 __func__, ieee80211_state_name[vap->iv_state]); 159 vap->iv_stats.is_tx_badstate++; 160 IEEE80211_UNLOCK(ic); 161 IFQ_LOCK(&ifp->if_snd); 162 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 163 IFQ_UNLOCK(&ifp->if_snd); 164 return; 165 } 166 IEEE80211_UNLOCK(ic); 167 } 168 for (;;) { 169 IFQ_DEQUEUE(&ifp->if_snd, m); 170 if (m == NULL) 171 break; 172 /* 173 * Sanitize mbuf flags for net80211 use. We cannot 174 * clear M_PWR_SAV or M_MORE_DATA because these may 175 * be set for frames that are re-submitted from the 176 * power save queue. 177 * 178 * NB: This must be done before ieee80211_classify as 179 * it marks EAPOL in frames with M_EAPOL. 180 */ 181 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 182 /* 183 * Cancel any background scan. 184 */ 185 if (ic->ic_flags & IEEE80211_F_SCAN) 186 ieee80211_cancel_anyscan(vap); 187 /* 188 * Find the node for the destination so we can do 189 * things like power save and fast frames aggregation. 190 * 191 * NB: past this point various code assumes the first 192 * mbuf has the 802.3 header present (and contiguous). 193 */ 194 ni = NULL; 195 if (m->m_len < sizeof(struct ether_header) && 196 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 197 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 198 "discard frame, %s\n", "m_pullup failed"); 199 vap->iv_stats.is_tx_nobuf++; /* XXX */ 200 ifp->if_oerrors++; 201 continue; 202 } 203 eh = mtod(m, struct ether_header *); 204 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 205 if (IS_DWDS(vap)) { 206 /* 207 * Only unicast frames from the above go out 208 * DWDS vaps; multicast frames are handled by 209 * dispatching the frame as it comes through 210 * the AP vap (see below). 211 */ 212 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 213 eh->ether_dhost, "mcast", "%s", "on DWDS"); 214 vap->iv_stats.is_dwds_mcast++; 215 m_freem(m); 216 continue; 217 } 218 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 219 /* 220 * Spam DWDS vap's w/ multicast traffic. 221 */ 222 /* XXX only if dwds in use? */ 223 ieee80211_dwds_mcast(vap, m); 224 } 225 } 226#ifdef IEEE80211_SUPPORT_MESH 227 if (vap->iv_opmode != IEEE80211_M_MBSS) { 228#endif 229 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 230 if (ni == NULL) { 231 /* NB: ieee80211_find_txnode does stat+msg */ 232 ifp->if_oerrors++; 233 m_freem(m); 234 continue; 235 } 236 if (ni->ni_associd == 0 && 237 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 238 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 239 eh->ether_dhost, NULL, 240 "sta not associated (type 0x%04x)", 241 htons(eh->ether_type)); 242 vap->iv_stats.is_tx_notassoc++; 243 ifp->if_oerrors++; 244 m_freem(m); 245 ieee80211_free_node(ni); 246 continue; 247 } 248#ifdef IEEE80211_SUPPORT_MESH 249 } else { 250 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 251 /* 252 * Proxy station only if configured. 253 */ 254 if (!ieee80211_mesh_isproxyena(vap)) { 255 IEEE80211_DISCARD_MAC(vap, 256 IEEE80211_MSG_OUTPUT | 257 IEEE80211_MSG_MESH, 258 eh->ether_dhost, NULL, 259 "%s", "proxy not enabled"); 260 vap->iv_stats.is_mesh_notproxy++; 261 ifp->if_oerrors++; 262 m_freem(m); 263 continue; 264 } 265 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 266 } 267 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 268 if (ni == NULL) { 269 /* 270 * NB: ieee80211_mesh_discover holds/disposes 271 * frame (e.g. queueing on path discovery). 272 */ 273 ifp->if_oerrors++; 274 continue; 275 } 276 } 277#endif 278 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 279 (m->m_flags & M_PWR_SAV) == 0) { 280 /* 281 * Station in power save mode; pass the frame 282 * to the 802.11 layer and continue. We'll get 283 * the frame back when the time is right. 284 * XXX lose WDS vap linkage? 285 */ 286 (void) ieee80211_pwrsave(ni, m); 287 ieee80211_free_node(ni); 288 continue; 289 } 290 /* calculate priority so drivers can find the tx queue */ 291 if (ieee80211_classify(ni, m)) { 292 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 293 eh->ether_dhost, NULL, 294 "%s", "classification failure"); 295 vap->iv_stats.is_tx_classify++; 296 ifp->if_oerrors++; 297 m_freem(m); 298 ieee80211_free_node(ni); 299 continue; 300 } 301 /* 302 * Stash the node pointer. Note that we do this after 303 * any call to ieee80211_dwds_mcast because that code 304 * uses any existing value for rcvif to identify the 305 * interface it (might have been) received on. 306 */ 307 m->m_pkthdr.rcvif = (void *)ni; 308 309 BPF_MTAP(ifp, m); /* 802.3 tx */ 310 311 /* 312 * Check if A-MPDU tx aggregation is setup or if we 313 * should try to enable it. The sta must be associated 314 * with HT and A-MPDU enabled for use. When the policy 315 * routine decides we should enable A-MPDU we issue an 316 * ADDBA request and wait for a reply. The frame being 317 * encapsulated will go out w/o using A-MPDU, or possibly 318 * it might be collected by the driver and held/retransmit. 319 * The default ic_ampdu_enable routine handles staggering 320 * ADDBA requests in case the receiver NAK's us or we are 321 * otherwise unable to establish a BA stream. 322 */ 323 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 324 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 325 (m->m_flags & M_EAPOL) == 0) { 326 const int ac = M_WME_GETAC(m); 327 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 328 329 ieee80211_txampdu_count_packet(tap); 330 if (IEEE80211_AMPDU_RUNNING(tap)) { 331 /* 332 * Operational, mark frame for aggregation. 333 * 334 * XXX do tx aggregation here 335 */ 336 m->m_flags |= M_AMPDU_MPDU; 337 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 338 ic->ic_ampdu_enable(ni, tap)) { 339 /* 340 * Not negotiated yet, request service. 341 */ 342 ieee80211_ampdu_request(ni, tap); 343 /* XXX hold frame for reply? */ 344 } 345 } 346#ifdef IEEE80211_SUPPORT_SUPERG 347 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 348 m = ieee80211_ff_check(ni, m); 349 if (m == NULL) { 350 /* NB: any ni ref held on stageq */ 351 continue; 352 } 353 } 354#endif /* IEEE80211_SUPPORT_SUPERG */ 355 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 356 /* 357 * Encapsulate the packet in prep for transmission. 358 */ 359 m = ieee80211_encap(vap, ni, m); 360 if (m == NULL) { 361 /* NB: stat+msg handled in ieee80211_encap */ 362 ieee80211_free_node(ni); 363 continue; 364 } 365 } 366 367 error = parent->if_transmit(parent, m); 368 if (error != 0) { 369 /* NB: IFQ_HANDOFF reclaims mbuf */ 370 ieee80211_free_node(ni); 371 } else { 372 ifp->if_opackets++; 373 } 374 ic->ic_lastdata = ticks; 375 } 376#undef IS_DWDS 377} 378 379/* 380 * 802.11 output routine. This is (currently) used only to 381 * connect bpf write calls to the 802.11 layer for injecting 382 * raw 802.11 frames. 383 */ 384int 385ieee80211_output(struct ifnet *ifp, struct mbuf *m, 386 struct sockaddr *dst, struct route *ro) 387{ 388#define senderr(e) do { error = (e); goto bad;} while (0) 389 struct ieee80211_node *ni = NULL; 390 struct ieee80211vap *vap; 391 struct ieee80211_frame *wh; 392 int error; 393 394 IFQ_LOCK(&ifp->if_snd); 395 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 396 IFQ_UNLOCK(&ifp->if_snd); 397 /* 398 * Short-circuit requests if the vap is marked OACTIVE 399 * as this can happen because a packet came down through 400 * ieee80211_start before the vap entered RUN state in 401 * which case it's ok to just drop the frame. This 402 * should not be necessary but callers of if_output don't 403 * check OACTIVE. 404 */ 405 senderr(ENETDOWN); 406 } 407 IFQ_UNLOCK(&ifp->if_snd); 408 vap = ifp->if_softc; 409 /* 410 * Hand to the 802.3 code if not tagged as 411 * a raw 802.11 frame. 412 */ 413 if (dst->sa_family != AF_IEEE80211) 414 return vap->iv_output(ifp, m, dst, ro); 415#ifdef MAC 416 error = mac_ifnet_check_transmit(ifp, m); 417 if (error) 418 senderr(error); 419#endif 420 if (ifp->if_flags & IFF_MONITOR) 421 senderr(ENETDOWN); 422 if (!IFNET_IS_UP_RUNNING(ifp)) 423 senderr(ENETDOWN); 424 if (vap->iv_state == IEEE80211_S_CAC) { 425 IEEE80211_DPRINTF(vap, 426 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 427 "block %s frame in CAC state\n", "raw data"); 428 vap->iv_stats.is_tx_badstate++; 429 senderr(EIO); /* XXX */ 430 } else if (vap->iv_state == IEEE80211_S_SCAN) 431 senderr(EIO); 432 /* XXX bypass bridge, pfil, carp, etc. */ 433 434 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 435 senderr(EIO); /* XXX */ 436 wh = mtod(m, struct ieee80211_frame *); 437 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 438 IEEE80211_FC0_VERSION_0) 439 senderr(EIO); /* XXX */ 440 441 /* locate destination node */ 442 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 443 case IEEE80211_FC1_DIR_NODS: 444 case IEEE80211_FC1_DIR_FROMDS: 445 ni = ieee80211_find_txnode(vap, wh->i_addr1); 446 break; 447 case IEEE80211_FC1_DIR_TODS: 448 case IEEE80211_FC1_DIR_DSTODS: 449 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 450 senderr(EIO); /* XXX */ 451 ni = ieee80211_find_txnode(vap, wh->i_addr3); 452 break; 453 default: 454 senderr(EIO); /* XXX */ 455 } 456 if (ni == NULL) { 457 /* 458 * Permit packets w/ bpf params through regardless 459 * (see below about sa_len). 460 */ 461 if (dst->sa_len == 0) 462 senderr(EHOSTUNREACH); 463 ni = ieee80211_ref_node(vap->iv_bss); 464 } 465 466 /* 467 * Sanitize mbuf for net80211 flags leaked from above. 468 * 469 * NB: This must be done before ieee80211_classify as 470 * it marks EAPOL in frames with M_EAPOL. 471 */ 472 m->m_flags &= ~M_80211_TX; 473 474 /* calculate priority so drivers can find the tx queue */ 475 /* XXX assumes an 802.3 frame */ 476 if (ieee80211_classify(ni, m)) 477 senderr(EIO); /* XXX */ 478 479 ifp->if_opackets++; 480 IEEE80211_NODE_STAT(ni, tx_data); 481 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 482 IEEE80211_NODE_STAT(ni, tx_mcast); 483 m->m_flags |= M_MCAST; 484 } else 485 IEEE80211_NODE_STAT(ni, tx_ucast); 486 /* NB: ieee80211_encap does not include 802.11 header */ 487 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 488 489 /* 490 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 491 * present by setting the sa_len field of the sockaddr (yes, 492 * this is a hack). 493 * NB: we assume sa_data is suitably aligned to cast. 494 */ 495 return vap->iv_ic->ic_raw_xmit(ni, m, 496 (const struct ieee80211_bpf_params *)(dst->sa_len ? 497 dst->sa_data : NULL)); 498bad: 499 if (m != NULL) 500 m_freem(m); 501 if (ni != NULL) 502 ieee80211_free_node(ni); 503 ifp->if_oerrors++; 504 return error; 505#undef senderr 506} 507 508/* 509 * Set the direction field and address fields of an outgoing 510 * frame. Note this should be called early on in constructing 511 * a frame as it sets i_fc[1]; other bits can then be or'd in. 512 */ 513void 514ieee80211_send_setup( 515 struct ieee80211_node *ni, 516 struct mbuf *m, 517 int type, int tid, 518 const uint8_t sa[IEEE80211_ADDR_LEN], 519 const uint8_t da[IEEE80211_ADDR_LEN], 520 const uint8_t bssid[IEEE80211_ADDR_LEN]) 521{ 522#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 523 struct ieee80211vap *vap = ni->ni_vap; 524 struct ieee80211_tx_ampdu *tap; 525 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 526 ieee80211_seq seqno; 527 528 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 529 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 530 switch (vap->iv_opmode) { 531 case IEEE80211_M_STA: 532 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 533 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 534 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 535 IEEE80211_ADDR_COPY(wh->i_addr3, da); 536 break; 537 case IEEE80211_M_IBSS: 538 case IEEE80211_M_AHDEMO: 539 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 540 IEEE80211_ADDR_COPY(wh->i_addr1, da); 541 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 542 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 543 break; 544 case IEEE80211_M_HOSTAP: 545 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 546 IEEE80211_ADDR_COPY(wh->i_addr1, da); 547 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 548 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 549 break; 550 case IEEE80211_M_WDS: 551 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 552 IEEE80211_ADDR_COPY(wh->i_addr1, da); 553 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 554 IEEE80211_ADDR_COPY(wh->i_addr3, da); 555 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 556 break; 557 case IEEE80211_M_MBSS: 558#ifdef IEEE80211_SUPPORT_MESH 559 /* XXX add support for proxied addresses */ 560 if (IEEE80211_IS_MULTICAST(da)) { 561 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 562 /* XXX next hop */ 563 IEEE80211_ADDR_COPY(wh->i_addr1, da); 564 IEEE80211_ADDR_COPY(wh->i_addr2, 565 vap->iv_myaddr); 566 } else { 567 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 568 IEEE80211_ADDR_COPY(wh->i_addr1, da); 569 IEEE80211_ADDR_COPY(wh->i_addr2, 570 vap->iv_myaddr); 571 IEEE80211_ADDR_COPY(wh->i_addr3, da); 572 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 573 } 574#endif 575 break; 576 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 577 break; 578 } 579 } else { 580 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 581 IEEE80211_ADDR_COPY(wh->i_addr1, da); 582 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 583#ifdef IEEE80211_SUPPORT_MESH 584 if (vap->iv_opmode == IEEE80211_M_MBSS) 585 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 586 else 587#endif 588 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 589 } 590 *(uint16_t *)&wh->i_dur[0] = 0; 591 592 tap = &ni->ni_tx_ampdu[TID_TO_WME_AC(tid)]; 593 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 594 m->m_flags |= M_AMPDU_MPDU; 595 else { 596 seqno = ni->ni_txseqs[tid]++; 597 *(uint16_t *)&wh->i_seq[0] = 598 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 599 M_SEQNO_SET(m, seqno); 600 } 601 602 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 603 m->m_flags |= M_MCAST; 604#undef WH4 605} 606 607/* 608 * Send a management frame to the specified node. The node pointer 609 * must have a reference as the pointer will be passed to the driver 610 * and potentially held for a long time. If the frame is successfully 611 * dispatched to the driver, then it is responsible for freeing the 612 * reference (and potentially free'ing up any associated storage); 613 * otherwise deal with reclaiming any reference (on error). 614 */ 615int 616ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 617 struct ieee80211_bpf_params *params) 618{ 619 struct ieee80211vap *vap = ni->ni_vap; 620 struct ieee80211com *ic = ni->ni_ic; 621 struct ieee80211_frame *wh; 622 623 KASSERT(ni != NULL, ("null node")); 624 625 if (vap->iv_state == IEEE80211_S_CAC) { 626 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 627 ni, "block %s frame in CAC state", 628 ieee80211_mgt_subtype_name[ 629 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 630 IEEE80211_FC0_SUBTYPE_SHIFT]); 631 vap->iv_stats.is_tx_badstate++; 632 ieee80211_free_node(ni); 633 m_freem(m); 634 return EIO; /* XXX */ 635 } 636 637 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 638 if (m == NULL) { 639 ieee80211_free_node(ni); 640 return ENOMEM; 641 } 642 643 wh = mtod(m, struct ieee80211_frame *); 644 ieee80211_send_setup(ni, m, 645 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 646 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 647 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 648 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 649 "encrypting frame (%s)", __func__); 650 wh->i_fc[1] |= IEEE80211_FC1_WEP; 651 } 652 m->m_flags |= M_ENCAP; /* mark encapsulated */ 653 654 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 655 M_WME_SETAC(m, params->ibp_pri); 656 657#ifdef IEEE80211_DEBUG 658 /* avoid printing too many frames */ 659 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 660 ieee80211_msg_dumppkts(vap)) { 661 printf("[%s] send %s on channel %u\n", 662 ether_sprintf(wh->i_addr1), 663 ieee80211_mgt_subtype_name[ 664 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 665 IEEE80211_FC0_SUBTYPE_SHIFT], 666 ieee80211_chan2ieee(ic, ic->ic_curchan)); 667 } 668#endif 669 IEEE80211_NODE_STAT(ni, tx_mgmt); 670 671 return ic->ic_raw_xmit(ni, m, params); 672} 673 674/* 675 * Send a null data frame to the specified node. If the station 676 * is setup for QoS then a QoS Null Data frame is constructed. 677 * If this is a WDS station then a 4-address frame is constructed. 678 * 679 * NB: the caller is assumed to have setup a node reference 680 * for use; this is necessary to deal with a race condition 681 * when probing for inactive stations. Like ieee80211_mgmt_output 682 * we must cleanup any node reference on error; however we 683 * can safely just unref it as we know it will never be the 684 * last reference to the node. 685 */ 686int 687ieee80211_send_nulldata(struct ieee80211_node *ni) 688{ 689 struct ieee80211vap *vap = ni->ni_vap; 690 struct ieee80211com *ic = ni->ni_ic; 691 struct mbuf *m; 692 struct ieee80211_frame *wh; 693 int hdrlen; 694 uint8_t *frm; 695 696 if (vap->iv_state == IEEE80211_S_CAC) { 697 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 698 ni, "block %s frame in CAC state", "null data"); 699 ieee80211_unref_node(&ni); 700 vap->iv_stats.is_tx_badstate++; 701 return EIO; /* XXX */ 702 } 703 704 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 705 hdrlen = sizeof(struct ieee80211_qosframe); 706 else 707 hdrlen = sizeof(struct ieee80211_frame); 708 /* NB: only WDS vap's get 4-address frames */ 709 if (vap->iv_opmode == IEEE80211_M_WDS) 710 hdrlen += IEEE80211_ADDR_LEN; 711 if (ic->ic_flags & IEEE80211_F_DATAPAD) 712 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 713 714 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 715 if (m == NULL) { 716 /* XXX debug msg */ 717 ieee80211_unref_node(&ni); 718 vap->iv_stats.is_tx_nobuf++; 719 return ENOMEM; 720 } 721 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 722 ("leading space %zd", M_LEADINGSPACE(m))); 723 M_PREPEND(m, hdrlen, M_DONTWAIT); 724 if (m == NULL) { 725 /* NB: cannot happen */ 726 ieee80211_free_node(ni); 727 return ENOMEM; 728 } 729 730 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 731 if (ni->ni_flags & IEEE80211_NODE_QOS) { 732 const int tid = WME_AC_TO_TID(WME_AC_BE); 733 uint8_t *qos; 734 735 ieee80211_send_setup(ni, m, 736 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 737 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 738 739 if (vap->iv_opmode == IEEE80211_M_WDS) 740 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 741 else 742 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 743 qos[0] = tid & IEEE80211_QOS_TID; 744 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 745 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 746 qos[1] = 0; 747 } else { 748 ieee80211_send_setup(ni, m, 749 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 750 IEEE80211_NONQOS_TID, 751 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 752 } 753 if (vap->iv_opmode != IEEE80211_M_WDS) { 754 /* NB: power management bit is never sent by an AP */ 755 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 756 vap->iv_opmode != IEEE80211_M_HOSTAP) 757 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 758 } 759 m->m_len = m->m_pkthdr.len = hdrlen; 760 m->m_flags |= M_ENCAP; /* mark encapsulated */ 761 762 M_WME_SETAC(m, WME_AC_BE); 763 764 IEEE80211_NODE_STAT(ni, tx_data); 765 766 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 767 "send %snull data frame on channel %u, pwr mgt %s", 768 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 769 ieee80211_chan2ieee(ic, ic->ic_curchan), 770 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 771 772 return ic->ic_raw_xmit(ni, m, NULL); 773} 774 775/* 776 * Assign priority to a frame based on any vlan tag assigned 777 * to the station and/or any Diffserv setting in an IP header. 778 * Finally, if an ACM policy is setup (in station mode) it's 779 * applied. 780 */ 781int 782ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 783{ 784 const struct ether_header *eh = mtod(m, struct ether_header *); 785 int v_wme_ac, d_wme_ac, ac; 786 787 /* 788 * Always promote PAE/EAPOL frames to high priority. 789 */ 790 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 791 /* NB: mark so others don't need to check header */ 792 m->m_flags |= M_EAPOL; 793 ac = WME_AC_VO; 794 goto done; 795 } 796 /* 797 * Non-qos traffic goes to BE. 798 */ 799 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 800 ac = WME_AC_BE; 801 goto done; 802 } 803 804 /* 805 * If node has a vlan tag then all traffic 806 * to it must have a matching tag. 807 */ 808 v_wme_ac = 0; 809 if (ni->ni_vlan != 0) { 810 if ((m->m_flags & M_VLANTAG) == 0) { 811 IEEE80211_NODE_STAT(ni, tx_novlantag); 812 return 1; 813 } 814 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 815 EVL_VLANOFTAG(ni->ni_vlan)) { 816 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 817 return 1; 818 } 819 /* map vlan priority to AC */ 820 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 821 } 822 823 /* XXX m_copydata may be too slow for fast path */ 824#ifdef INET 825 if (eh->ether_type == htons(ETHERTYPE_IP)) { 826 uint8_t tos; 827 /* 828 * IP frame, map the DSCP bits from the TOS field. 829 */ 830 /* NB: ip header may not be in first mbuf */ 831 m_copydata(m, sizeof(struct ether_header) + 832 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 833 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 834 d_wme_ac = TID_TO_WME_AC(tos); 835 } else { 836#endif /* INET */ 837#ifdef INET6 838 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 839 uint32_t flow; 840 uint8_t tos; 841 /* 842 * IPv6 frame, map the DSCP bits from the traffic class field. 843 */ 844 m_copydata(m, sizeof(struct ether_header) + 845 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 846 (caddr_t) &flow); 847 tos = (uint8_t)(ntohl(flow) >> 20); 848 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 849 d_wme_ac = TID_TO_WME_AC(tos); 850 } else { 851#endif /* INET6 */ 852 d_wme_ac = WME_AC_BE; 853#ifdef INET6 854 } 855#endif 856#ifdef INET 857 } 858#endif 859 /* 860 * Use highest priority AC. 861 */ 862 if (v_wme_ac > d_wme_ac) 863 ac = v_wme_ac; 864 else 865 ac = d_wme_ac; 866 867 /* 868 * Apply ACM policy. 869 */ 870 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 871 static const int acmap[4] = { 872 WME_AC_BK, /* WME_AC_BE */ 873 WME_AC_BK, /* WME_AC_BK */ 874 WME_AC_BE, /* WME_AC_VI */ 875 WME_AC_VI, /* WME_AC_VO */ 876 }; 877 struct ieee80211com *ic = ni->ni_ic; 878 879 while (ac != WME_AC_BK && 880 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 881 ac = acmap[ac]; 882 } 883done: 884 M_WME_SETAC(m, ac); 885 return 0; 886} 887 888/* 889 * Insure there is sufficient contiguous space to encapsulate the 890 * 802.11 data frame. If room isn't already there, arrange for it. 891 * Drivers and cipher modules assume we have done the necessary work 892 * and fail rudely if they don't find the space they need. 893 */ 894struct mbuf * 895ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 896 struct ieee80211_key *key, struct mbuf *m) 897{ 898#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 899 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 900 901 if (key != NULL) { 902 /* XXX belongs in crypto code? */ 903 needed_space += key->wk_cipher->ic_header; 904 /* XXX frags */ 905 /* 906 * When crypto is being done in the host we must insure 907 * the data are writable for the cipher routines; clone 908 * a writable mbuf chain. 909 * XXX handle SWMIC specially 910 */ 911 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 912 m = m_unshare(m, M_NOWAIT); 913 if (m == NULL) { 914 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 915 "%s: cannot get writable mbuf\n", __func__); 916 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 917 return NULL; 918 } 919 } 920 } 921 /* 922 * We know we are called just before stripping an Ethernet 923 * header and prepending an LLC header. This means we know 924 * there will be 925 * sizeof(struct ether_header) - sizeof(struct llc) 926 * bytes recovered to which we need additional space for the 927 * 802.11 header and any crypto header. 928 */ 929 /* XXX check trailing space and copy instead? */ 930 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 931 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 932 if (n == NULL) { 933 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 934 "%s: cannot expand storage\n", __func__); 935 vap->iv_stats.is_tx_nobuf++; 936 m_freem(m); 937 return NULL; 938 } 939 KASSERT(needed_space <= MHLEN, 940 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 941 /* 942 * Setup new mbuf to have leading space to prepend the 943 * 802.11 header and any crypto header bits that are 944 * required (the latter are added when the driver calls 945 * back to ieee80211_crypto_encap to do crypto encapsulation). 946 */ 947 /* NB: must be first 'cuz it clobbers m_data */ 948 m_move_pkthdr(n, m); 949 n->m_len = 0; /* NB: m_gethdr does not set */ 950 n->m_data += needed_space; 951 /* 952 * Pull up Ethernet header to create the expected layout. 953 * We could use m_pullup but that's overkill (i.e. we don't 954 * need the actual data) and it cannot fail so do it inline 955 * for speed. 956 */ 957 /* NB: struct ether_header is known to be contiguous */ 958 n->m_len += sizeof(struct ether_header); 959 m->m_len -= sizeof(struct ether_header); 960 m->m_data += sizeof(struct ether_header); 961 /* 962 * Replace the head of the chain. 963 */ 964 n->m_next = m; 965 m = n; 966 } 967 return m; 968#undef TO_BE_RECLAIMED 969} 970 971/* 972 * Return the transmit key to use in sending a unicast frame. 973 * If a unicast key is set we use that. When no unicast key is set 974 * we fall back to the default transmit key. 975 */ 976static __inline struct ieee80211_key * 977ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 978 struct ieee80211_node *ni) 979{ 980 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 981 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 982 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 983 return NULL; 984 return &vap->iv_nw_keys[vap->iv_def_txkey]; 985 } else { 986 return &ni->ni_ucastkey; 987 } 988} 989 990/* 991 * Return the transmit key to use in sending a multicast frame. 992 * Multicast traffic always uses the group key which is installed as 993 * the default tx key. 994 */ 995static __inline struct ieee80211_key * 996ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 997 struct ieee80211_node *ni) 998{ 999 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1000 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1001 return NULL; 1002 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1003} 1004 1005/* 1006 * Encapsulate an outbound data frame. The mbuf chain is updated. 1007 * If an error is encountered NULL is returned. The caller is required 1008 * to provide a node reference and pullup the ethernet header in the 1009 * first mbuf. 1010 * 1011 * NB: Packet is assumed to be processed by ieee80211_classify which 1012 * marked EAPOL frames w/ M_EAPOL. 1013 */ 1014struct mbuf * 1015ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1016 struct mbuf *m) 1017{ 1018#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1019 struct ieee80211com *ic = ni->ni_ic; 1020#ifdef IEEE80211_SUPPORT_MESH 1021 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1022 struct ieee80211_meshcntl_ae10 *mc; 1023#endif 1024 struct ether_header eh; 1025 struct ieee80211_frame *wh; 1026 struct ieee80211_key *key; 1027 struct llc *llc; 1028 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1029 ieee80211_seq seqno; 1030 int meshhdrsize, meshae; 1031 uint8_t *qos; 1032 1033 /* 1034 * Copy existing Ethernet header to a safe place. The 1035 * rest of the code assumes it's ok to strip it when 1036 * reorganizing state for the final encapsulation. 1037 */ 1038 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1039 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1040 1041 /* 1042 * Insure space for additional headers. First identify 1043 * transmit key to use in calculating any buffer adjustments 1044 * required. This is also used below to do privacy 1045 * encapsulation work. Then calculate the 802.11 header 1046 * size and any padding required by the driver. 1047 * 1048 * Note key may be NULL if we fall back to the default 1049 * transmit key and that is not set. In that case the 1050 * buffer may not be expanded as needed by the cipher 1051 * routines, but they will/should discard it. 1052 */ 1053 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1054 if (vap->iv_opmode == IEEE80211_M_STA || 1055 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1056 (vap->iv_opmode == IEEE80211_M_WDS && 1057 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1058 key = ieee80211_crypto_getucastkey(vap, ni); 1059 else 1060 key = ieee80211_crypto_getmcastkey(vap, ni); 1061 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1062 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1063 eh.ether_dhost, 1064 "no default transmit key (%s) deftxkey %u", 1065 __func__, vap->iv_def_txkey); 1066 vap->iv_stats.is_tx_nodefkey++; 1067 goto bad; 1068 } 1069 } else 1070 key = NULL; 1071 /* 1072 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1073 * frames so suppress use. This may be an issue if other 1074 * ap's require all data frames to be QoS-encapsulated 1075 * once negotiated in which case we'll need to make this 1076 * configurable. 1077 */ 1078 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1079 (m->m_flags & M_EAPOL) == 0; 1080 if (addqos) 1081 hdrsize = sizeof(struct ieee80211_qosframe); 1082 else 1083 hdrsize = sizeof(struct ieee80211_frame); 1084#ifdef IEEE80211_SUPPORT_MESH 1085 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1086 /* 1087 * Mesh data frames are encapsulated according to the 1088 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1089 * o Group Addressed data (aka multicast) originating 1090 * at the local sta are sent w/ 3-address format and 1091 * address extension mode 00 1092 * o Individually Addressed data (aka unicast) originating 1093 * at the local sta are sent w/ 4-address format and 1094 * address extension mode 00 1095 * o Group Addressed data forwarded from a non-mesh sta are 1096 * sent w/ 3-address format and address extension mode 01 1097 * o Individually Address data from another sta are sent 1098 * w/ 4-address format and address extension mode 10 1099 */ 1100 is4addr = 0; /* NB: don't use, disable */ 1101 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1102 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1103 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1104 /* XXX defines for AE modes */ 1105 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1106 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1107 meshae = 0; 1108 else 1109 meshae = 4; /* NB: pseudo */ 1110 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1111 meshae = 1; 1112 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1113 } else { 1114 meshae = 2; 1115 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1116 } 1117 } else { 1118#endif 1119 /* 1120 * 4-address frames need to be generated for: 1121 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1122 * o packets sent through a vap marked for relaying 1123 * (e.g. a station operating with dynamic WDS) 1124 */ 1125 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1126 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1127 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1128 if (is4addr) 1129 hdrsize += IEEE80211_ADDR_LEN; 1130 meshhdrsize = meshae = 0; 1131#ifdef IEEE80211_SUPPORT_MESH 1132 } 1133#endif 1134 /* 1135 * Honor driver DATAPAD requirement. 1136 */ 1137 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1138 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1139 else 1140 hdrspace = hdrsize; 1141 1142 if (__predict_true((m->m_flags & M_FF) == 0)) { 1143 /* 1144 * Normal frame. 1145 */ 1146 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1147 if (m == NULL) { 1148 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1149 goto bad; 1150 } 1151 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1152 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1153 llc = mtod(m, struct llc *); 1154 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1155 llc->llc_control = LLC_UI; 1156 llc->llc_snap.org_code[0] = 0; 1157 llc->llc_snap.org_code[1] = 0; 1158 llc->llc_snap.org_code[2] = 0; 1159 llc->llc_snap.ether_type = eh.ether_type; 1160 } else { 1161#ifdef IEEE80211_SUPPORT_SUPERG 1162 /* 1163 * Aggregated frame. 1164 */ 1165 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1166 if (m == NULL) 1167#endif 1168 goto bad; 1169 } 1170 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1171 1172 M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT); 1173 if (m == NULL) { 1174 vap->iv_stats.is_tx_nobuf++; 1175 goto bad; 1176 } 1177 wh = mtod(m, struct ieee80211_frame *); 1178 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1179 *(uint16_t *)wh->i_dur = 0; 1180 qos = NULL; /* NB: quiet compiler */ 1181 if (is4addr) { 1182 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1183 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1184 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1185 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1186 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1187 } else switch (vap->iv_opmode) { 1188 case IEEE80211_M_STA: 1189 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1190 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1191 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1192 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1193 break; 1194 case IEEE80211_M_IBSS: 1195 case IEEE80211_M_AHDEMO: 1196 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1197 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1198 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1199 /* 1200 * NB: always use the bssid from iv_bss as the 1201 * neighbor's may be stale after an ibss merge 1202 */ 1203 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1204 break; 1205 case IEEE80211_M_HOSTAP: 1206 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1207 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1208 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1209 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1210 break; 1211#ifdef IEEE80211_SUPPORT_MESH 1212 case IEEE80211_M_MBSS: 1213 /* NB: offset by hdrspace to deal with DATAPAD */ 1214 mc = (struct ieee80211_meshcntl_ae10 *) 1215 (mtod(m, uint8_t *) + hdrspace); 1216 switch (meshae) { 1217 case 0: /* ucast, no proxy */ 1218 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1219 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1220 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1221 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1222 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1223 mc->mc_flags = 0; 1224 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1225 break; 1226 case 4: /* mcast, no proxy */ 1227 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1228 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1229 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1230 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1231 mc->mc_flags = 0; /* NB: AE is really 0 */ 1232 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1233 break; 1234 case 1: /* mcast, proxy */ 1235 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1236 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1237 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1238 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1239 mc->mc_flags = 1; 1240 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1241 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1242 break; 1243 case 2: /* ucast, proxy */ 1244 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1245 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1246 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1247 /* XXX not right, need MeshDA */ 1248 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1249 /* XXX assume are MeshSA */ 1250 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1251 mc->mc_flags = 2; 1252 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1253 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1254 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1255 break; 1256 default: 1257 KASSERT(0, ("meshae %d", meshae)); 1258 break; 1259 } 1260 mc->mc_ttl = ms->ms_ttl; 1261 ms->ms_seq++; 1262 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1263 break; 1264#endif 1265 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1266 default: 1267 goto bad; 1268 } 1269 if (m->m_flags & M_MORE_DATA) 1270 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1271 if (addqos) { 1272 int ac, tid; 1273 1274 if (is4addr) { 1275 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1276 /* NB: mesh case handled earlier */ 1277 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1278 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1279 ac = M_WME_GETAC(m); 1280 /* map from access class/queue to 11e header priorty value */ 1281 tid = WME_AC_TO_TID(ac); 1282 qos[0] = tid & IEEE80211_QOS_TID; 1283 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1284 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1285 qos[1] = 0; 1286 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1287 1288 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1289 /* 1290 * NB: don't assign a sequence # to potential 1291 * aggregates; we expect this happens at the 1292 * point the frame comes off any aggregation q 1293 * as otherwise we may introduce holes in the 1294 * BA sequence space and/or make window accouting 1295 * more difficult. 1296 * 1297 * XXX may want to control this with a driver 1298 * capability; this may also change when we pull 1299 * aggregation up into net80211 1300 */ 1301 seqno = ni->ni_txseqs[tid]++; 1302 *(uint16_t *)wh->i_seq = 1303 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1304 M_SEQNO_SET(m, seqno); 1305 } 1306 } else { 1307 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1308 *(uint16_t *)wh->i_seq = 1309 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1310 M_SEQNO_SET(m, seqno); 1311 } 1312 1313 1314 /* check if xmit fragmentation is required */ 1315 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1316 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1317 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1318 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1319 if (key != NULL) { 1320 /* 1321 * IEEE 802.1X: send EAPOL frames always in the clear. 1322 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1323 */ 1324 if ((m->m_flags & M_EAPOL) == 0 || 1325 ((vap->iv_flags & IEEE80211_F_WPA) && 1326 (vap->iv_opmode == IEEE80211_M_STA ? 1327 !IEEE80211_KEY_UNDEFINED(key) : 1328 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1329 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1330 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1331 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1332 eh.ether_dhost, 1333 "%s", "enmic failed, discard frame"); 1334 vap->iv_stats.is_crypto_enmicfail++; 1335 goto bad; 1336 } 1337 } 1338 } 1339 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1340 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1341 goto bad; 1342 1343 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1344 1345 IEEE80211_NODE_STAT(ni, tx_data); 1346 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1347 IEEE80211_NODE_STAT(ni, tx_mcast); 1348 m->m_flags |= M_MCAST; 1349 } else 1350 IEEE80211_NODE_STAT(ni, tx_ucast); 1351 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1352 1353 return m; 1354bad: 1355 if (m != NULL) 1356 m_freem(m); 1357 return NULL; 1358#undef WH4 1359} 1360 1361/* 1362 * Fragment the frame according to the specified mtu. 1363 * The size of the 802.11 header (w/o padding) is provided 1364 * so we don't need to recalculate it. We create a new 1365 * mbuf for each fragment and chain it through m_nextpkt; 1366 * we might be able to optimize this by reusing the original 1367 * packet's mbufs but that is significantly more complicated. 1368 */ 1369static int 1370ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1371 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1372{ 1373 struct ieee80211_frame *wh, *whf; 1374 struct mbuf *m, *prev, *next; 1375 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1376 1377 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1378 KASSERT(m0->m_pkthdr.len > mtu, 1379 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1380 1381 wh = mtod(m0, struct ieee80211_frame *); 1382 /* NB: mark the first frag; it will be propagated below */ 1383 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1384 totalhdrsize = hdrsize + ciphdrsize; 1385 fragno = 1; 1386 off = mtu - ciphdrsize; 1387 remainder = m0->m_pkthdr.len - off; 1388 prev = m0; 1389 do { 1390 fragsize = totalhdrsize + remainder; 1391 if (fragsize > mtu) 1392 fragsize = mtu; 1393 /* XXX fragsize can be >2048! */ 1394 KASSERT(fragsize < MCLBYTES, 1395 ("fragment size %u too big!", fragsize)); 1396 if (fragsize > MHLEN) 1397 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1398 else 1399 m = m_gethdr(M_DONTWAIT, MT_DATA); 1400 if (m == NULL) 1401 goto bad; 1402 /* leave room to prepend any cipher header */ 1403 m_align(m, fragsize - ciphdrsize); 1404 1405 /* 1406 * Form the header in the fragment. Note that since 1407 * we mark the first fragment with the MORE_FRAG bit 1408 * it automatically is propagated to each fragment; we 1409 * need only clear it on the last fragment (done below). 1410 */ 1411 whf = mtod(m, struct ieee80211_frame *); 1412 memcpy(whf, wh, hdrsize); 1413 *(uint16_t *)&whf->i_seq[0] |= htole16( 1414 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1415 IEEE80211_SEQ_FRAG_SHIFT); 1416 fragno++; 1417 1418 payload = fragsize - totalhdrsize; 1419 /* NB: destination is known to be contiguous */ 1420 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1421 m->m_len = hdrsize + payload; 1422 m->m_pkthdr.len = hdrsize + payload; 1423 m->m_flags |= M_FRAG; 1424 1425 /* chain up the fragment */ 1426 prev->m_nextpkt = m; 1427 prev = m; 1428 1429 /* deduct fragment just formed */ 1430 remainder -= payload; 1431 off += payload; 1432 } while (remainder != 0); 1433 1434 /* set the last fragment */ 1435 m->m_flags |= M_LASTFRAG; 1436 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1437 1438 /* strip first mbuf now that everything has been copied */ 1439 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1440 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1441 1442 vap->iv_stats.is_tx_fragframes++; 1443 vap->iv_stats.is_tx_frags += fragno-1; 1444 1445 return 1; 1446bad: 1447 /* reclaim fragments but leave original frame for caller to free */ 1448 for (m = m0->m_nextpkt; m != NULL; m = next) { 1449 next = m->m_nextpkt; 1450 m->m_nextpkt = NULL; /* XXX paranoid */ 1451 m_freem(m); 1452 } 1453 m0->m_nextpkt = NULL; 1454 return 0; 1455} 1456 1457/* 1458 * Add a supported rates element id to a frame. 1459 */ 1460uint8_t * 1461ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1462{ 1463 int nrates; 1464 1465 *frm++ = IEEE80211_ELEMID_RATES; 1466 nrates = rs->rs_nrates; 1467 if (nrates > IEEE80211_RATE_SIZE) 1468 nrates = IEEE80211_RATE_SIZE; 1469 *frm++ = nrates; 1470 memcpy(frm, rs->rs_rates, nrates); 1471 return frm + nrates; 1472} 1473 1474/* 1475 * Add an extended supported rates element id to a frame. 1476 */ 1477uint8_t * 1478ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1479{ 1480 /* 1481 * Add an extended supported rates element if operating in 11g mode. 1482 */ 1483 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1484 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1485 *frm++ = IEEE80211_ELEMID_XRATES; 1486 *frm++ = nrates; 1487 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1488 frm += nrates; 1489 } 1490 return frm; 1491} 1492 1493/* 1494 * Add an ssid element to a frame. 1495 */ 1496static uint8_t * 1497ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1498{ 1499 *frm++ = IEEE80211_ELEMID_SSID; 1500 *frm++ = len; 1501 memcpy(frm, ssid, len); 1502 return frm + len; 1503} 1504 1505/* 1506 * Add an erp element to a frame. 1507 */ 1508static uint8_t * 1509ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1510{ 1511 uint8_t erp; 1512 1513 *frm++ = IEEE80211_ELEMID_ERP; 1514 *frm++ = 1; 1515 erp = 0; 1516 if (ic->ic_nonerpsta != 0) 1517 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1518 if (ic->ic_flags & IEEE80211_F_USEPROT) 1519 erp |= IEEE80211_ERP_USE_PROTECTION; 1520 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1521 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1522 *frm++ = erp; 1523 return frm; 1524} 1525 1526/* 1527 * Add a CFParams element to a frame. 1528 */ 1529static uint8_t * 1530ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1531{ 1532#define ADDSHORT(frm, v) do { \ 1533 LE_WRITE_2(frm, v); \ 1534 frm += 2; \ 1535} while (0) 1536 *frm++ = IEEE80211_ELEMID_CFPARMS; 1537 *frm++ = 6; 1538 *frm++ = 0; /* CFP count */ 1539 *frm++ = 2; /* CFP period */ 1540 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1541 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1542 return frm; 1543#undef ADDSHORT 1544} 1545 1546static __inline uint8_t * 1547add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1548{ 1549 memcpy(frm, ie->ie_data, ie->ie_len); 1550 return frm + ie->ie_len; 1551} 1552 1553static __inline uint8_t * 1554add_ie(uint8_t *frm, const uint8_t *ie) 1555{ 1556 memcpy(frm, ie, 2 + ie[1]); 1557 return frm + 2 + ie[1]; 1558} 1559 1560#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1561/* 1562 * Add a WME information element to a frame. 1563 */ 1564static uint8_t * 1565ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1566{ 1567 static const struct ieee80211_wme_info info = { 1568 .wme_id = IEEE80211_ELEMID_VENDOR, 1569 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1570 .wme_oui = { WME_OUI_BYTES }, 1571 .wme_type = WME_OUI_TYPE, 1572 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1573 .wme_version = WME_VERSION, 1574 .wme_info = 0, 1575 }; 1576 memcpy(frm, &info, sizeof(info)); 1577 return frm + sizeof(info); 1578} 1579 1580/* 1581 * Add a WME parameters element to a frame. 1582 */ 1583static uint8_t * 1584ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1585{ 1586#define SM(_v, _f) (((_v) << _f##_S) & _f) 1587#define ADDSHORT(frm, v) do { \ 1588 LE_WRITE_2(frm, v); \ 1589 frm += 2; \ 1590} while (0) 1591 /* NB: this works 'cuz a param has an info at the front */ 1592 static const struct ieee80211_wme_info param = { 1593 .wme_id = IEEE80211_ELEMID_VENDOR, 1594 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1595 .wme_oui = { WME_OUI_BYTES }, 1596 .wme_type = WME_OUI_TYPE, 1597 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1598 .wme_version = WME_VERSION, 1599 }; 1600 int i; 1601 1602 memcpy(frm, ¶m, sizeof(param)); 1603 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1604 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1605 *frm++ = 0; /* reserved field */ 1606 for (i = 0; i < WME_NUM_AC; i++) { 1607 const struct wmeParams *ac = 1608 &wme->wme_bssChanParams.cap_wmeParams[i]; 1609 *frm++ = SM(i, WME_PARAM_ACI) 1610 | SM(ac->wmep_acm, WME_PARAM_ACM) 1611 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1612 ; 1613 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1614 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1615 ; 1616 ADDSHORT(frm, ac->wmep_txopLimit); 1617 } 1618 return frm; 1619#undef SM 1620#undef ADDSHORT 1621} 1622#undef WME_OUI_BYTES 1623 1624/* 1625 * Add an 11h Power Constraint element to a frame. 1626 */ 1627static uint8_t * 1628ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1629{ 1630 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1631 /* XXX per-vap tx power limit? */ 1632 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1633 1634 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1635 frm[1] = 1; 1636 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1637 return frm + 3; 1638} 1639 1640/* 1641 * Add an 11h Power Capability element to a frame. 1642 */ 1643static uint8_t * 1644ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1645{ 1646 frm[0] = IEEE80211_ELEMID_PWRCAP; 1647 frm[1] = 2; 1648 frm[2] = c->ic_minpower; 1649 frm[3] = c->ic_maxpower; 1650 return frm + 4; 1651} 1652 1653/* 1654 * Add an 11h Supported Channels element to a frame. 1655 */ 1656static uint8_t * 1657ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1658{ 1659 static const int ielen = 26; 1660 1661 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1662 frm[1] = ielen; 1663 /* XXX not correct */ 1664 memcpy(frm+2, ic->ic_chan_avail, ielen); 1665 return frm + 2 + ielen; 1666} 1667 1668/* 1669 * Add an 11h Quiet time element to a frame. 1670 */ 1671static uint8_t * 1672ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 1673{ 1674 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 1675 1676 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 1677 quiet->len = 6; 1678 if (vap->iv_quiet_count_value == 1) 1679 vap->iv_quiet_count_value = vap->iv_quiet_count; 1680 else if (vap->iv_quiet_count_value > 1) 1681 vap->iv_quiet_count_value--; 1682 1683 if (vap->iv_quiet_count_value == 0) { 1684 /* value 0 is reserved as per 802.11h standerd */ 1685 vap->iv_quiet_count_value = 1; 1686 } 1687 1688 quiet->tbttcount = vap->iv_quiet_count_value; 1689 quiet->period = vap->iv_quiet_period; 1690 quiet->duration = htole16(vap->iv_quiet_duration); 1691 quiet->offset = htole16(vap->iv_quiet_offset); 1692 return frm + sizeof(*quiet); 1693} 1694 1695/* 1696 * Add an 11h Channel Switch Announcement element to a frame. 1697 * Note that we use the per-vap CSA count to adjust the global 1698 * counter so we can use this routine to form probe response 1699 * frames and get the current count. 1700 */ 1701static uint8_t * 1702ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1703{ 1704 struct ieee80211com *ic = vap->iv_ic; 1705 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1706 1707 csa->csa_ie = IEEE80211_ELEMID_CSA; 1708 csa->csa_len = 3; 1709 csa->csa_mode = 1; /* XXX force quiet on channel */ 1710 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1711 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1712 return frm + sizeof(*csa); 1713} 1714 1715/* 1716 * Add an 11h country information element to a frame. 1717 */ 1718static uint8_t * 1719ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1720{ 1721 1722 if (ic->ic_countryie == NULL || 1723 ic->ic_countryie_chan != ic->ic_bsschan) { 1724 /* 1725 * Handle lazy construction of ie. This is done on 1726 * first use and after a channel change that requires 1727 * re-calculation. 1728 */ 1729 if (ic->ic_countryie != NULL) 1730 free(ic->ic_countryie, M_80211_NODE_IE); 1731 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1732 if (ic->ic_countryie == NULL) 1733 return frm; 1734 ic->ic_countryie_chan = ic->ic_bsschan; 1735 } 1736 return add_appie(frm, ic->ic_countryie); 1737} 1738 1739/* 1740 * Send a probe request frame with the specified ssid 1741 * and any optional information element data. 1742 */ 1743int 1744ieee80211_send_probereq(struct ieee80211_node *ni, 1745 const uint8_t sa[IEEE80211_ADDR_LEN], 1746 const uint8_t da[IEEE80211_ADDR_LEN], 1747 const uint8_t bssid[IEEE80211_ADDR_LEN], 1748 const uint8_t *ssid, size_t ssidlen) 1749{ 1750 struct ieee80211vap *vap = ni->ni_vap; 1751 struct ieee80211com *ic = ni->ni_ic; 1752 const struct ieee80211_txparam *tp; 1753 struct ieee80211_bpf_params params; 1754 struct ieee80211_frame *wh; 1755 const struct ieee80211_rateset *rs; 1756 struct mbuf *m; 1757 uint8_t *frm; 1758 1759 if (vap->iv_state == IEEE80211_S_CAC) { 1760 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1761 "block %s frame in CAC state", "probe request"); 1762 vap->iv_stats.is_tx_badstate++; 1763 return EIO; /* XXX */ 1764 } 1765 1766 /* 1767 * Hold a reference on the node so it doesn't go away until after 1768 * the xmit is complete all the way in the driver. On error we 1769 * will remove our reference. 1770 */ 1771 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1772 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1773 __func__, __LINE__, 1774 ni, ether_sprintf(ni->ni_macaddr), 1775 ieee80211_node_refcnt(ni)+1); 1776 ieee80211_ref_node(ni); 1777 1778 /* 1779 * prreq frame format 1780 * [tlv] ssid 1781 * [tlv] supported rates 1782 * [tlv] RSN (optional) 1783 * [tlv] extended supported rates 1784 * [tlv] WPA (optional) 1785 * [tlv] user-specified ie's 1786 */ 1787 m = ieee80211_getmgtframe(&frm, 1788 ic->ic_headroom + sizeof(struct ieee80211_frame), 1789 2 + IEEE80211_NWID_LEN 1790 + 2 + IEEE80211_RATE_SIZE 1791 + sizeof(struct ieee80211_ie_wpa) 1792 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1793 + sizeof(struct ieee80211_ie_wpa) 1794 + (vap->iv_appie_probereq != NULL ? 1795 vap->iv_appie_probereq->ie_len : 0) 1796 ); 1797 if (m == NULL) { 1798 vap->iv_stats.is_tx_nobuf++; 1799 ieee80211_free_node(ni); 1800 return ENOMEM; 1801 } 1802 1803 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1804 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1805 frm = ieee80211_add_rates(frm, rs); 1806 if (vap->iv_flags & IEEE80211_F_WPA2) { 1807 if (vap->iv_rsn_ie != NULL) 1808 frm = add_ie(frm, vap->iv_rsn_ie); 1809 /* XXX else complain? */ 1810 } 1811 frm = ieee80211_add_xrates(frm, rs); 1812 if (vap->iv_flags & IEEE80211_F_WPA1) { 1813 if (vap->iv_wpa_ie != NULL) 1814 frm = add_ie(frm, vap->iv_wpa_ie); 1815 /* XXX else complain? */ 1816 } 1817 if (vap->iv_appie_probereq != NULL) 1818 frm = add_appie(frm, vap->iv_appie_probereq); 1819 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1820 1821 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1822 ("leading space %zd", M_LEADINGSPACE(m))); 1823 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1824 if (m == NULL) { 1825 /* NB: cannot happen */ 1826 ieee80211_free_node(ni); 1827 return ENOMEM; 1828 } 1829 1830 wh = mtod(m, struct ieee80211_frame *); 1831 ieee80211_send_setup(ni, m, 1832 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1833 IEEE80211_NONQOS_TID, sa, da, bssid); 1834 /* XXX power management? */ 1835 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1836 1837 M_WME_SETAC(m, WME_AC_BE); 1838 1839 IEEE80211_NODE_STAT(ni, tx_probereq); 1840 IEEE80211_NODE_STAT(ni, tx_mgmt); 1841 1842 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1843 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1844 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1845 ssidlen, ssid); 1846 1847 memset(¶ms, 0, sizeof(params)); 1848 params.ibp_pri = M_WME_GETAC(m); 1849 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1850 params.ibp_rate0 = tp->mgmtrate; 1851 if (IEEE80211_IS_MULTICAST(da)) { 1852 params.ibp_flags |= IEEE80211_BPF_NOACK; 1853 params.ibp_try0 = 1; 1854 } else 1855 params.ibp_try0 = tp->maxretry; 1856 params.ibp_power = ni->ni_txpower; 1857 return ic->ic_raw_xmit(ni, m, ¶ms); 1858} 1859 1860/* 1861 * Calculate capability information for mgt frames. 1862 */ 1863uint16_t 1864ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1865{ 1866 struct ieee80211com *ic = vap->iv_ic; 1867 uint16_t capinfo; 1868 1869 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1870 1871 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1872 capinfo = IEEE80211_CAPINFO_ESS; 1873 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1874 capinfo = IEEE80211_CAPINFO_IBSS; 1875 else 1876 capinfo = 0; 1877 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1878 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1879 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1880 IEEE80211_IS_CHAN_2GHZ(chan)) 1881 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1882 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1883 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1884 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1885 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1886 return capinfo; 1887} 1888 1889/* 1890 * Send a management frame. The node is for the destination (or ic_bss 1891 * when in station mode). Nodes other than ic_bss have their reference 1892 * count bumped to reflect our use for an indeterminant time. 1893 */ 1894int 1895ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1896{ 1897#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1898#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1899 struct ieee80211vap *vap = ni->ni_vap; 1900 struct ieee80211com *ic = ni->ni_ic; 1901 struct ieee80211_node *bss = vap->iv_bss; 1902 struct ieee80211_bpf_params params; 1903 struct mbuf *m; 1904 uint8_t *frm; 1905 uint16_t capinfo; 1906 int has_challenge, is_shared_key, ret, status; 1907 1908 KASSERT(ni != NULL, ("null node")); 1909 1910 /* 1911 * Hold a reference on the node so it doesn't go away until after 1912 * the xmit is complete all the way in the driver. On error we 1913 * will remove our reference. 1914 */ 1915 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1916 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1917 __func__, __LINE__, 1918 ni, ether_sprintf(ni->ni_macaddr), 1919 ieee80211_node_refcnt(ni)+1); 1920 ieee80211_ref_node(ni); 1921 1922 memset(¶ms, 0, sizeof(params)); 1923 switch (type) { 1924 1925 case IEEE80211_FC0_SUBTYPE_AUTH: 1926 status = arg >> 16; 1927 arg &= 0xffff; 1928 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1929 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1930 ni->ni_challenge != NULL); 1931 1932 /* 1933 * Deduce whether we're doing open authentication or 1934 * shared key authentication. We do the latter if 1935 * we're in the middle of a shared key authentication 1936 * handshake or if we're initiating an authentication 1937 * request and configured to use shared key. 1938 */ 1939 is_shared_key = has_challenge || 1940 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1941 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1942 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1943 1944 m = ieee80211_getmgtframe(&frm, 1945 ic->ic_headroom + sizeof(struct ieee80211_frame), 1946 3 * sizeof(uint16_t) 1947 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1948 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1949 ); 1950 if (m == NULL) 1951 senderr(ENOMEM, is_tx_nobuf); 1952 1953 ((uint16_t *)frm)[0] = 1954 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1955 : htole16(IEEE80211_AUTH_ALG_OPEN); 1956 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1957 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1958 1959 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1960 ((uint16_t *)frm)[3] = 1961 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1962 IEEE80211_ELEMID_CHALLENGE); 1963 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1964 IEEE80211_CHALLENGE_LEN); 1965 m->m_pkthdr.len = m->m_len = 1966 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1967 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1968 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1969 "request encrypt frame (%s)", __func__); 1970 /* mark frame for encryption */ 1971 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1972 } 1973 } else 1974 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1975 1976 /* XXX not right for shared key */ 1977 if (status == IEEE80211_STATUS_SUCCESS) 1978 IEEE80211_NODE_STAT(ni, tx_auth); 1979 else 1980 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1981 1982 if (vap->iv_opmode == IEEE80211_M_STA) 1983 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1984 (void *) vap->iv_state); 1985 break; 1986 1987 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1988 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1989 "send station deauthenticate (reason %d)", arg); 1990 m = ieee80211_getmgtframe(&frm, 1991 ic->ic_headroom + sizeof(struct ieee80211_frame), 1992 sizeof(uint16_t)); 1993 if (m == NULL) 1994 senderr(ENOMEM, is_tx_nobuf); 1995 *(uint16_t *)frm = htole16(arg); /* reason */ 1996 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1997 1998 IEEE80211_NODE_STAT(ni, tx_deauth); 1999 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2000 2001 ieee80211_node_unauthorize(ni); /* port closed */ 2002 break; 2003 2004 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2005 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2006 /* 2007 * asreq frame format 2008 * [2] capability information 2009 * [2] listen interval 2010 * [6*] current AP address (reassoc only) 2011 * [tlv] ssid 2012 * [tlv] supported rates 2013 * [tlv] extended supported rates 2014 * [4] power capability (optional) 2015 * [28] supported channels (optional) 2016 * [tlv] HT capabilities 2017 * [tlv] WME (optional) 2018 * [tlv] Vendor OUI HT capabilities (optional) 2019 * [tlv] Atheros capabilities (if negotiated) 2020 * [tlv] AppIE's (optional) 2021 */ 2022 m = ieee80211_getmgtframe(&frm, 2023 ic->ic_headroom + sizeof(struct ieee80211_frame), 2024 sizeof(uint16_t) 2025 + sizeof(uint16_t) 2026 + IEEE80211_ADDR_LEN 2027 + 2 + IEEE80211_NWID_LEN 2028 + 2 + IEEE80211_RATE_SIZE 2029 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2030 + 4 2031 + 2 + 26 2032 + sizeof(struct ieee80211_wme_info) 2033 + sizeof(struct ieee80211_ie_htcap) 2034 + 4 + sizeof(struct ieee80211_ie_htcap) 2035#ifdef IEEE80211_SUPPORT_SUPERG 2036 + sizeof(struct ieee80211_ath_ie) 2037#endif 2038 + (vap->iv_appie_wpa != NULL ? 2039 vap->iv_appie_wpa->ie_len : 0) 2040 + (vap->iv_appie_assocreq != NULL ? 2041 vap->iv_appie_assocreq->ie_len : 0) 2042 ); 2043 if (m == NULL) 2044 senderr(ENOMEM, is_tx_nobuf); 2045 2046 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2047 ("wrong mode %u", vap->iv_opmode)); 2048 capinfo = IEEE80211_CAPINFO_ESS; 2049 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2050 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2051 /* 2052 * NB: Some 11a AP's reject the request when 2053 * short premable is set. 2054 */ 2055 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2056 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2057 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2058 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2059 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2060 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2061 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2062 (vap->iv_flags & IEEE80211_F_DOTH)) 2063 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2064 *(uint16_t *)frm = htole16(capinfo); 2065 frm += 2; 2066 2067 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2068 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2069 bss->ni_intval)); 2070 frm += 2; 2071 2072 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2073 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2074 frm += IEEE80211_ADDR_LEN; 2075 } 2076 2077 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2078 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2079 if (vap->iv_flags & IEEE80211_F_WPA2) { 2080 if (vap->iv_rsn_ie != NULL) 2081 frm = add_ie(frm, vap->iv_rsn_ie); 2082 /* XXX else complain? */ 2083 } 2084 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2085 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2086 frm = ieee80211_add_powercapability(frm, 2087 ic->ic_curchan); 2088 frm = ieee80211_add_supportedchannels(frm, ic); 2089 } 2090 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2091 ni->ni_ies.htcap_ie != NULL && 2092 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2093 frm = ieee80211_add_htcap(frm, ni); 2094 if (vap->iv_flags & IEEE80211_F_WPA1) { 2095 if (vap->iv_wpa_ie != NULL) 2096 frm = add_ie(frm, vap->iv_wpa_ie); 2097 /* XXX else complain */ 2098 } 2099 if ((ic->ic_flags & IEEE80211_F_WME) && 2100 ni->ni_ies.wme_ie != NULL) 2101 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2102 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2103 ni->ni_ies.htcap_ie != NULL && 2104 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2105 frm = ieee80211_add_htcap_vendor(frm, ni); 2106#ifdef IEEE80211_SUPPORT_SUPERG 2107 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2108 frm = ieee80211_add_ath(frm, 2109 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2110 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2111 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2112 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2113 } 2114#endif /* IEEE80211_SUPPORT_SUPERG */ 2115 if (vap->iv_appie_assocreq != NULL) 2116 frm = add_appie(frm, vap->iv_appie_assocreq); 2117 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2118 2119 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2120 (void *) vap->iv_state); 2121 break; 2122 2123 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2124 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2125 /* 2126 * asresp frame format 2127 * [2] capability information 2128 * [2] status 2129 * [2] association ID 2130 * [tlv] supported rates 2131 * [tlv] extended supported rates 2132 * [tlv] HT capabilities (standard, if STA enabled) 2133 * [tlv] HT information (standard, if STA enabled) 2134 * [tlv] WME (if configured and STA enabled) 2135 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2136 * [tlv] HT information (vendor OUI, if STA enabled) 2137 * [tlv] Atheros capabilities (if STA enabled) 2138 * [tlv] AppIE's (optional) 2139 */ 2140 m = ieee80211_getmgtframe(&frm, 2141 ic->ic_headroom + sizeof(struct ieee80211_frame), 2142 sizeof(uint16_t) 2143 + sizeof(uint16_t) 2144 + sizeof(uint16_t) 2145 + 2 + IEEE80211_RATE_SIZE 2146 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2147 + sizeof(struct ieee80211_ie_htcap) + 4 2148 + sizeof(struct ieee80211_ie_htinfo) + 4 2149 + sizeof(struct ieee80211_wme_param) 2150#ifdef IEEE80211_SUPPORT_SUPERG 2151 + sizeof(struct ieee80211_ath_ie) 2152#endif 2153 + (vap->iv_appie_assocresp != NULL ? 2154 vap->iv_appie_assocresp->ie_len : 0) 2155 ); 2156 if (m == NULL) 2157 senderr(ENOMEM, is_tx_nobuf); 2158 2159 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2160 *(uint16_t *)frm = htole16(capinfo); 2161 frm += 2; 2162 2163 *(uint16_t *)frm = htole16(arg); /* status */ 2164 frm += 2; 2165 2166 if (arg == IEEE80211_STATUS_SUCCESS) { 2167 *(uint16_t *)frm = htole16(ni->ni_associd); 2168 IEEE80211_NODE_STAT(ni, tx_assoc); 2169 } else 2170 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2171 frm += 2; 2172 2173 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2174 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2175 /* NB: respond according to what we received */ 2176 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2177 frm = ieee80211_add_htcap(frm, ni); 2178 frm = ieee80211_add_htinfo(frm, ni); 2179 } 2180 if ((vap->iv_flags & IEEE80211_F_WME) && 2181 ni->ni_ies.wme_ie != NULL) 2182 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2183 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2184 frm = ieee80211_add_htcap_vendor(frm, ni); 2185 frm = ieee80211_add_htinfo_vendor(frm, ni); 2186 } 2187#ifdef IEEE80211_SUPPORT_SUPERG 2188 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2189 frm = ieee80211_add_ath(frm, 2190 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2191 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2192 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2193 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2194#endif /* IEEE80211_SUPPORT_SUPERG */ 2195 if (vap->iv_appie_assocresp != NULL) 2196 frm = add_appie(frm, vap->iv_appie_assocresp); 2197 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2198 break; 2199 2200 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2201 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2202 "send station disassociate (reason %d)", arg); 2203 m = ieee80211_getmgtframe(&frm, 2204 ic->ic_headroom + sizeof(struct ieee80211_frame), 2205 sizeof(uint16_t)); 2206 if (m == NULL) 2207 senderr(ENOMEM, is_tx_nobuf); 2208 *(uint16_t *)frm = htole16(arg); /* reason */ 2209 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2210 2211 IEEE80211_NODE_STAT(ni, tx_disassoc); 2212 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2213 break; 2214 2215 default: 2216 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2217 "invalid mgmt frame type %u", type); 2218 senderr(EINVAL, is_tx_unknownmgt); 2219 /* NOTREACHED */ 2220 } 2221 2222 /* NB: force non-ProbeResp frames to the highest queue */ 2223 params.ibp_pri = WME_AC_VO; 2224 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2225 /* NB: we know all frames are unicast */ 2226 params.ibp_try0 = bss->ni_txparms->maxretry; 2227 params.ibp_power = bss->ni_txpower; 2228 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2229bad: 2230 ieee80211_free_node(ni); 2231 return ret; 2232#undef senderr 2233#undef HTFLAGS 2234} 2235 2236/* 2237 * Return an mbuf with a probe response frame in it. 2238 * Space is left to prepend and 802.11 header at the 2239 * front but it's left to the caller to fill in. 2240 */ 2241struct mbuf * 2242ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2243{ 2244 struct ieee80211vap *vap = bss->ni_vap; 2245 struct ieee80211com *ic = bss->ni_ic; 2246 const struct ieee80211_rateset *rs; 2247 struct mbuf *m; 2248 uint16_t capinfo; 2249 uint8_t *frm; 2250 2251 /* 2252 * probe response frame format 2253 * [8] time stamp 2254 * [2] beacon interval 2255 * [2] cabability information 2256 * [tlv] ssid 2257 * [tlv] supported rates 2258 * [tlv] parameter set (FH/DS) 2259 * [tlv] parameter set (IBSS) 2260 * [tlv] country (optional) 2261 * [3] power control (optional) 2262 * [5] channel switch announcement (CSA) (optional) 2263 * [tlv] extended rate phy (ERP) 2264 * [tlv] extended supported rates 2265 * [tlv] RSN (optional) 2266 * [tlv] HT capabilities 2267 * [tlv] HT information 2268 * [tlv] WPA (optional) 2269 * [tlv] WME (optional) 2270 * [tlv] Vendor OUI HT capabilities (optional) 2271 * [tlv] Vendor OUI HT information (optional) 2272 * [tlv] Atheros capabilities 2273 * [tlv] AppIE's (optional) 2274 * [tlv] Mesh ID (MBSS) 2275 * [tlv] Mesh Conf (MBSS) 2276 */ 2277 m = ieee80211_getmgtframe(&frm, 2278 ic->ic_headroom + sizeof(struct ieee80211_frame), 2279 8 2280 + sizeof(uint16_t) 2281 + sizeof(uint16_t) 2282 + 2 + IEEE80211_NWID_LEN 2283 + 2 + IEEE80211_RATE_SIZE 2284 + 7 /* max(7,3) */ 2285 + IEEE80211_COUNTRY_MAX_SIZE 2286 + 3 2287 + sizeof(struct ieee80211_csa_ie) 2288 + sizeof(struct ieee80211_quiet_ie) 2289 + 3 2290 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2291 + sizeof(struct ieee80211_ie_wpa) 2292 + sizeof(struct ieee80211_ie_htcap) 2293 + sizeof(struct ieee80211_ie_htinfo) 2294 + sizeof(struct ieee80211_ie_wpa) 2295 + sizeof(struct ieee80211_wme_param) 2296 + 4 + sizeof(struct ieee80211_ie_htcap) 2297 + 4 + sizeof(struct ieee80211_ie_htinfo) 2298#ifdef IEEE80211_SUPPORT_SUPERG 2299 + sizeof(struct ieee80211_ath_ie) 2300#endif 2301#ifdef IEEE80211_SUPPORT_MESH 2302 + 2 + IEEE80211_MESHID_LEN 2303 + sizeof(struct ieee80211_meshconf_ie) 2304#endif 2305 + (vap->iv_appie_proberesp != NULL ? 2306 vap->iv_appie_proberesp->ie_len : 0) 2307 ); 2308 if (m == NULL) { 2309 vap->iv_stats.is_tx_nobuf++; 2310 return NULL; 2311 } 2312 2313 memset(frm, 0, 8); /* timestamp should be filled later */ 2314 frm += 8; 2315 *(uint16_t *)frm = htole16(bss->ni_intval); 2316 frm += 2; 2317 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2318 *(uint16_t *)frm = htole16(capinfo); 2319 frm += 2; 2320 2321 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2322 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2323 frm = ieee80211_add_rates(frm, rs); 2324 2325 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2326 *frm++ = IEEE80211_ELEMID_FHPARMS; 2327 *frm++ = 5; 2328 *frm++ = bss->ni_fhdwell & 0x00ff; 2329 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2330 *frm++ = IEEE80211_FH_CHANSET( 2331 ieee80211_chan2ieee(ic, bss->ni_chan)); 2332 *frm++ = IEEE80211_FH_CHANPAT( 2333 ieee80211_chan2ieee(ic, bss->ni_chan)); 2334 *frm++ = bss->ni_fhindex; 2335 } else { 2336 *frm++ = IEEE80211_ELEMID_DSPARMS; 2337 *frm++ = 1; 2338 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2339 } 2340 2341 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2342 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2343 *frm++ = 2; 2344 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2345 } 2346 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2347 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2348 frm = ieee80211_add_countryie(frm, ic); 2349 if (vap->iv_flags & IEEE80211_F_DOTH) { 2350 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2351 frm = ieee80211_add_powerconstraint(frm, vap); 2352 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2353 frm = ieee80211_add_csa(frm, vap); 2354 } 2355 if (vap->iv_flags & IEEE80211_F_DOTH) { 2356 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2357 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2358 if (vap->iv_quiet) 2359 frm = ieee80211_add_quiet(frm, vap); 2360 } 2361 } 2362 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2363 frm = ieee80211_add_erp(frm, ic); 2364 frm = ieee80211_add_xrates(frm, rs); 2365 if (vap->iv_flags & IEEE80211_F_WPA2) { 2366 if (vap->iv_rsn_ie != NULL) 2367 frm = add_ie(frm, vap->iv_rsn_ie); 2368 /* XXX else complain? */ 2369 } 2370 /* 2371 * NB: legacy 11b clients do not get certain ie's. 2372 * The caller identifies such clients by passing 2373 * a token in legacy to us. Could expand this to be 2374 * any legacy client for stuff like HT ie's. 2375 */ 2376 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2377 legacy != IEEE80211_SEND_LEGACY_11B) { 2378 frm = ieee80211_add_htcap(frm, bss); 2379 frm = ieee80211_add_htinfo(frm, bss); 2380 } 2381 if (vap->iv_flags & IEEE80211_F_WPA1) { 2382 if (vap->iv_wpa_ie != NULL) 2383 frm = add_ie(frm, vap->iv_wpa_ie); 2384 /* XXX else complain? */ 2385 } 2386 if (vap->iv_flags & IEEE80211_F_WME) 2387 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2388 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2389 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2390 legacy != IEEE80211_SEND_LEGACY_11B) { 2391 frm = ieee80211_add_htcap_vendor(frm, bss); 2392 frm = ieee80211_add_htinfo_vendor(frm, bss); 2393 } 2394#ifdef IEEE80211_SUPPORT_SUPERG 2395 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2396 legacy != IEEE80211_SEND_LEGACY_11B) 2397 frm = ieee80211_add_athcaps(frm, bss); 2398#endif 2399 if (vap->iv_appie_proberesp != NULL) 2400 frm = add_appie(frm, vap->iv_appie_proberesp); 2401#ifdef IEEE80211_SUPPORT_MESH 2402 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2403 frm = ieee80211_add_meshid(frm, vap); 2404 frm = ieee80211_add_meshconf(frm, vap); 2405 } 2406#endif 2407 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2408 2409 return m; 2410} 2411 2412/* 2413 * Send a probe response frame to the specified mac address. 2414 * This does not go through the normal mgt frame api so we 2415 * can specify the destination address and re-use the bss node 2416 * for the sta reference. 2417 */ 2418int 2419ieee80211_send_proberesp(struct ieee80211vap *vap, 2420 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2421{ 2422 struct ieee80211_node *bss = vap->iv_bss; 2423 struct ieee80211com *ic = vap->iv_ic; 2424 struct ieee80211_frame *wh; 2425 struct mbuf *m; 2426 2427 if (vap->iv_state == IEEE80211_S_CAC) { 2428 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2429 "block %s frame in CAC state", "probe response"); 2430 vap->iv_stats.is_tx_badstate++; 2431 return EIO; /* XXX */ 2432 } 2433 2434 /* 2435 * Hold a reference on the node so it doesn't go away until after 2436 * the xmit is complete all the way in the driver. On error we 2437 * will remove our reference. 2438 */ 2439 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2440 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2441 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2442 ieee80211_node_refcnt(bss)+1); 2443 ieee80211_ref_node(bss); 2444 2445 m = ieee80211_alloc_proberesp(bss, legacy); 2446 if (m == NULL) { 2447 ieee80211_free_node(bss); 2448 return ENOMEM; 2449 } 2450 2451 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2452 KASSERT(m != NULL, ("no room for header")); 2453 2454 wh = mtod(m, struct ieee80211_frame *); 2455 ieee80211_send_setup(bss, m, 2456 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2457 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2458 /* XXX power management? */ 2459 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2460 2461 M_WME_SETAC(m, WME_AC_BE); 2462 2463 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2464 "send probe resp on channel %u to %s%s\n", 2465 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2466 legacy ? " <legacy>" : ""); 2467 IEEE80211_NODE_STAT(bss, tx_mgmt); 2468 2469 return ic->ic_raw_xmit(bss, m, NULL); 2470} 2471 2472/* 2473 * Allocate and build a RTS (Request To Send) control frame. 2474 */ 2475struct mbuf * 2476ieee80211_alloc_rts(struct ieee80211com *ic, 2477 const uint8_t ra[IEEE80211_ADDR_LEN], 2478 const uint8_t ta[IEEE80211_ADDR_LEN], 2479 uint16_t dur) 2480{ 2481 struct ieee80211_frame_rts *rts; 2482 struct mbuf *m; 2483 2484 /* XXX honor ic_headroom */ 2485 m = m_gethdr(M_DONTWAIT, MT_DATA); 2486 if (m != NULL) { 2487 rts = mtod(m, struct ieee80211_frame_rts *); 2488 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2489 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2490 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2491 *(u_int16_t *)rts->i_dur = htole16(dur); 2492 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2493 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2494 2495 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2496 } 2497 return m; 2498} 2499 2500/* 2501 * Allocate and build a CTS (Clear To Send) control frame. 2502 */ 2503struct mbuf * 2504ieee80211_alloc_cts(struct ieee80211com *ic, 2505 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2506{ 2507 struct ieee80211_frame_cts *cts; 2508 struct mbuf *m; 2509 2510 /* XXX honor ic_headroom */ 2511 m = m_gethdr(M_DONTWAIT, MT_DATA); 2512 if (m != NULL) { 2513 cts = mtod(m, struct ieee80211_frame_cts *); 2514 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2515 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2516 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2517 *(u_int16_t *)cts->i_dur = htole16(dur); 2518 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2519 2520 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2521 } 2522 return m; 2523} 2524 2525static void 2526ieee80211_tx_mgt_timeout(void *arg) 2527{ 2528 struct ieee80211_node *ni = arg; 2529 struct ieee80211vap *vap = ni->ni_vap; 2530 2531 if (vap->iv_state != IEEE80211_S_INIT && 2532 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2533 /* 2534 * NB: it's safe to specify a timeout as the reason here; 2535 * it'll only be used in the right state. 2536 */ 2537 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2538 IEEE80211_SCAN_FAIL_TIMEOUT); 2539 } 2540} 2541 2542static void 2543ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2544{ 2545 struct ieee80211vap *vap = ni->ni_vap; 2546 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2547 2548 /* 2549 * Frame transmit completed; arrange timer callback. If 2550 * transmit was successfuly we wait for response. Otherwise 2551 * we arrange an immediate callback instead of doing the 2552 * callback directly since we don't know what state the driver 2553 * is in (e.g. what locks it is holding). This work should 2554 * not be too time-critical and not happen too often so the 2555 * added overhead is acceptable. 2556 * 2557 * XXX what happens if !acked but response shows up before callback? 2558 */ 2559 if (vap->iv_state == ostate) 2560 callout_reset(&vap->iv_mgtsend, 2561 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2562 ieee80211_tx_mgt_timeout, ni); 2563} 2564 2565static void 2566ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2567 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2568{ 2569 struct ieee80211vap *vap = ni->ni_vap; 2570 struct ieee80211com *ic = ni->ni_ic; 2571 struct ieee80211_rateset *rs = &ni->ni_rates; 2572 uint16_t capinfo; 2573 2574 /* 2575 * beacon frame format 2576 * [8] time stamp 2577 * [2] beacon interval 2578 * [2] cabability information 2579 * [tlv] ssid 2580 * [tlv] supported rates 2581 * [3] parameter set (DS) 2582 * [8] CF parameter set (optional) 2583 * [tlv] parameter set (IBSS/TIM) 2584 * [tlv] country (optional) 2585 * [3] power control (optional) 2586 * [5] channel switch announcement (CSA) (optional) 2587 * [tlv] extended rate phy (ERP) 2588 * [tlv] extended supported rates 2589 * [tlv] RSN parameters 2590 * [tlv] HT capabilities 2591 * [tlv] HT information 2592 * XXX Vendor-specific OIDs (e.g. Atheros) 2593 * [tlv] WPA parameters 2594 * [tlv] WME parameters 2595 * [tlv] Vendor OUI HT capabilities (optional) 2596 * [tlv] Vendor OUI HT information (optional) 2597 * [tlv] Atheros capabilities (optional) 2598 * [tlv] TDMA parameters (optional) 2599 * [tlv] Mesh ID (MBSS) 2600 * [tlv] Mesh Conf (MBSS) 2601 * [tlv] application data (optional) 2602 */ 2603 2604 memset(bo, 0, sizeof(*bo)); 2605 2606 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2607 frm += 8; 2608 *(uint16_t *)frm = htole16(ni->ni_intval); 2609 frm += 2; 2610 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2611 bo->bo_caps = (uint16_t *)frm; 2612 *(uint16_t *)frm = htole16(capinfo); 2613 frm += 2; 2614 *frm++ = IEEE80211_ELEMID_SSID; 2615 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2616 *frm++ = ni->ni_esslen; 2617 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2618 frm += ni->ni_esslen; 2619 } else 2620 *frm++ = 0; 2621 frm = ieee80211_add_rates(frm, rs); 2622 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2623 *frm++ = IEEE80211_ELEMID_DSPARMS; 2624 *frm++ = 1; 2625 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2626 } 2627 if (ic->ic_flags & IEEE80211_F_PCF) { 2628 bo->bo_cfp = frm; 2629 frm = ieee80211_add_cfparms(frm, ic); 2630 } 2631 bo->bo_tim = frm; 2632 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2633 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2634 *frm++ = 2; 2635 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2636 bo->bo_tim_len = 0; 2637 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2638 vap->iv_opmode == IEEE80211_M_MBSS) { 2639 /* TIM IE is the same for Mesh and Hostap */ 2640 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2641 2642 tie->tim_ie = IEEE80211_ELEMID_TIM; 2643 tie->tim_len = 4; /* length */ 2644 tie->tim_count = 0; /* DTIM count */ 2645 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2646 tie->tim_bitctl = 0; /* bitmap control */ 2647 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2648 frm += sizeof(struct ieee80211_tim_ie); 2649 bo->bo_tim_len = 1; 2650 } 2651 bo->bo_tim_trailer = frm; 2652 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2653 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2654 frm = ieee80211_add_countryie(frm, ic); 2655 if (vap->iv_flags & IEEE80211_F_DOTH) { 2656 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2657 frm = ieee80211_add_powerconstraint(frm, vap); 2658 bo->bo_csa = frm; 2659 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2660 frm = ieee80211_add_csa(frm, vap); 2661 } else 2662 bo->bo_csa = frm; 2663 2664 if (vap->iv_flags & IEEE80211_F_DOTH) { 2665 bo->bo_quiet = frm; 2666 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2667 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2668 if (vap->iv_quiet) 2669 frm = ieee80211_add_quiet(frm,vap); 2670 } 2671 } else 2672 bo->bo_quiet = frm; 2673 2674 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2675 bo->bo_erp = frm; 2676 frm = ieee80211_add_erp(frm, ic); 2677 } 2678 frm = ieee80211_add_xrates(frm, rs); 2679 if (vap->iv_flags & IEEE80211_F_WPA2) { 2680 if (vap->iv_rsn_ie != NULL) 2681 frm = add_ie(frm, vap->iv_rsn_ie); 2682 /* XXX else complain */ 2683 } 2684 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2685 frm = ieee80211_add_htcap(frm, ni); 2686 bo->bo_htinfo = frm; 2687 frm = ieee80211_add_htinfo(frm, ni); 2688 } 2689 if (vap->iv_flags & IEEE80211_F_WPA1) { 2690 if (vap->iv_wpa_ie != NULL) 2691 frm = add_ie(frm, vap->iv_wpa_ie); 2692 /* XXX else complain */ 2693 } 2694 if (vap->iv_flags & IEEE80211_F_WME) { 2695 bo->bo_wme = frm; 2696 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2697 } 2698 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2699 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2700 frm = ieee80211_add_htcap_vendor(frm, ni); 2701 frm = ieee80211_add_htinfo_vendor(frm, ni); 2702 } 2703#ifdef IEEE80211_SUPPORT_SUPERG 2704 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2705 bo->bo_ath = frm; 2706 frm = ieee80211_add_athcaps(frm, ni); 2707 } 2708#endif 2709#ifdef IEEE80211_SUPPORT_TDMA 2710 if (vap->iv_caps & IEEE80211_C_TDMA) { 2711 bo->bo_tdma = frm; 2712 frm = ieee80211_add_tdma(frm, vap); 2713 } 2714#endif 2715 if (vap->iv_appie_beacon != NULL) { 2716 bo->bo_appie = frm; 2717 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2718 frm = add_appie(frm, vap->iv_appie_beacon); 2719 } 2720#ifdef IEEE80211_SUPPORT_MESH 2721 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2722 frm = ieee80211_add_meshid(frm, vap); 2723 bo->bo_meshconf = frm; 2724 frm = ieee80211_add_meshconf(frm, vap); 2725 } 2726#endif 2727 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2728 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2729 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2730} 2731 2732/* 2733 * Allocate a beacon frame and fillin the appropriate bits. 2734 */ 2735struct mbuf * 2736ieee80211_beacon_alloc(struct ieee80211_node *ni, 2737 struct ieee80211_beacon_offsets *bo) 2738{ 2739 struct ieee80211vap *vap = ni->ni_vap; 2740 struct ieee80211com *ic = ni->ni_ic; 2741 struct ifnet *ifp = vap->iv_ifp; 2742 struct ieee80211_frame *wh; 2743 struct mbuf *m; 2744 int pktlen; 2745 uint8_t *frm; 2746 2747 /* 2748 * beacon frame format 2749 * [8] time stamp 2750 * [2] beacon interval 2751 * [2] cabability information 2752 * [tlv] ssid 2753 * [tlv] supported rates 2754 * [3] parameter set (DS) 2755 * [8] CF parameter set (optional) 2756 * [tlv] parameter set (IBSS/TIM) 2757 * [tlv] country (optional) 2758 * [3] power control (optional) 2759 * [5] channel switch announcement (CSA) (optional) 2760 * [tlv] extended rate phy (ERP) 2761 * [tlv] extended supported rates 2762 * [tlv] RSN parameters 2763 * [tlv] HT capabilities 2764 * [tlv] HT information 2765 * [tlv] Vendor OUI HT capabilities (optional) 2766 * [tlv] Vendor OUI HT information (optional) 2767 * XXX Vendor-specific OIDs (e.g. Atheros) 2768 * [tlv] WPA parameters 2769 * [tlv] WME parameters 2770 * [tlv] TDMA parameters (optional) 2771 * [tlv] Mesh ID (MBSS) 2772 * [tlv] Mesh Conf (MBSS) 2773 * [tlv] application data (optional) 2774 * NB: we allocate the max space required for the TIM bitmap. 2775 * XXX how big is this? 2776 */ 2777 pktlen = 8 /* time stamp */ 2778 + sizeof(uint16_t) /* beacon interval */ 2779 + sizeof(uint16_t) /* capabilities */ 2780 + 2 + ni->ni_esslen /* ssid */ 2781 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2782 + 2 + 1 /* DS parameters */ 2783 + 2 + 6 /* CF parameters */ 2784 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2785 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2786 + 2 + 1 /* power control */ 2787 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2788 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 2789 + 2 + 1 /* ERP */ 2790 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2791 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2792 2*sizeof(struct ieee80211_ie_wpa) : 0) 2793 /* XXX conditional? */ 2794 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2795 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2796 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2797 sizeof(struct ieee80211_wme_param) : 0) 2798#ifdef IEEE80211_SUPPORT_SUPERG 2799 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2800#endif 2801#ifdef IEEE80211_SUPPORT_TDMA 2802 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2803 sizeof(struct ieee80211_tdma_param) : 0) 2804#endif 2805#ifdef IEEE80211_SUPPORT_MESH 2806 + 2 + ni->ni_meshidlen 2807 + sizeof(struct ieee80211_meshconf_ie) 2808#endif 2809 + IEEE80211_MAX_APPIE 2810 ; 2811 m = ieee80211_getmgtframe(&frm, 2812 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2813 if (m == NULL) { 2814 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2815 "%s: cannot get buf; size %u\n", __func__, pktlen); 2816 vap->iv_stats.is_tx_nobuf++; 2817 return NULL; 2818 } 2819 ieee80211_beacon_construct(m, frm, bo, ni); 2820 2821 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2822 KASSERT(m != NULL, ("no space for 802.11 header?")); 2823 wh = mtod(m, struct ieee80211_frame *); 2824 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2825 IEEE80211_FC0_SUBTYPE_BEACON; 2826 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2827 *(uint16_t *)wh->i_dur = 0; 2828 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2829 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2830 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2831 *(uint16_t *)wh->i_seq = 0; 2832 2833 return m; 2834} 2835 2836/* 2837 * Update the dynamic parts of a beacon frame based on the current state. 2838 */ 2839int 2840ieee80211_beacon_update(struct ieee80211_node *ni, 2841 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2842{ 2843 struct ieee80211vap *vap = ni->ni_vap; 2844 struct ieee80211com *ic = ni->ni_ic; 2845 int len_changed = 0; 2846 uint16_t capinfo; 2847 struct ieee80211_frame *wh; 2848 ieee80211_seq seqno; 2849 2850 IEEE80211_LOCK(ic); 2851 /* 2852 * Handle 11h channel change when we've reached the count. 2853 * We must recalculate the beacon frame contents to account 2854 * for the new channel. Note we do this only for the first 2855 * vap that reaches this point; subsequent vaps just update 2856 * their beacon state to reflect the recalculated channel. 2857 */ 2858 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2859 vap->iv_csa_count == ic->ic_csa_count) { 2860 vap->iv_csa_count = 0; 2861 /* 2862 * Effect channel change before reconstructing the beacon 2863 * frame contents as many places reference ni_chan. 2864 */ 2865 if (ic->ic_csa_newchan != NULL) 2866 ieee80211_csa_completeswitch(ic); 2867 /* 2868 * NB: ieee80211_beacon_construct clears all pending 2869 * updates in bo_flags so we don't need to explicitly 2870 * clear IEEE80211_BEACON_CSA. 2871 */ 2872 ieee80211_beacon_construct(m, 2873 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2874 2875 /* XXX do WME aggressive mode processing? */ 2876 IEEE80211_UNLOCK(ic); 2877 return 1; /* just assume length changed */ 2878 } 2879 2880 wh = mtod(m, struct ieee80211_frame *); 2881 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 2882 *(uint16_t *)&wh->i_seq[0] = 2883 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 2884 M_SEQNO_SET(m, seqno); 2885 2886 /* XXX faster to recalculate entirely or just changes? */ 2887 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2888 *bo->bo_caps = htole16(capinfo); 2889 2890 if (vap->iv_flags & IEEE80211_F_WME) { 2891 struct ieee80211_wme_state *wme = &ic->ic_wme; 2892 2893 /* 2894 * Check for agressive mode change. When there is 2895 * significant high priority traffic in the BSS 2896 * throttle back BE traffic by using conservative 2897 * parameters. Otherwise BE uses agressive params 2898 * to optimize performance of legacy/non-QoS traffic. 2899 */ 2900 if (wme->wme_flags & WME_F_AGGRMODE) { 2901 if (wme->wme_hipri_traffic > 2902 wme->wme_hipri_switch_thresh) { 2903 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2904 "%s: traffic %u, disable aggressive mode\n", 2905 __func__, wme->wme_hipri_traffic); 2906 wme->wme_flags &= ~WME_F_AGGRMODE; 2907 ieee80211_wme_updateparams_locked(vap); 2908 wme->wme_hipri_traffic = 2909 wme->wme_hipri_switch_hysteresis; 2910 } else 2911 wme->wme_hipri_traffic = 0; 2912 } else { 2913 if (wme->wme_hipri_traffic <= 2914 wme->wme_hipri_switch_thresh) { 2915 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2916 "%s: traffic %u, enable aggressive mode\n", 2917 __func__, wme->wme_hipri_traffic); 2918 wme->wme_flags |= WME_F_AGGRMODE; 2919 ieee80211_wme_updateparams_locked(vap); 2920 wme->wme_hipri_traffic = 0; 2921 } else 2922 wme->wme_hipri_traffic = 2923 wme->wme_hipri_switch_hysteresis; 2924 } 2925 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2926 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2927 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2928 } 2929 } 2930 2931 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2932 ieee80211_ht_update_beacon(vap, bo); 2933 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2934 } 2935#ifdef IEEE80211_SUPPORT_TDMA 2936 if (vap->iv_caps & IEEE80211_C_TDMA) { 2937 /* 2938 * NB: the beacon is potentially updated every TBTT. 2939 */ 2940 ieee80211_tdma_update_beacon(vap, bo); 2941 } 2942#endif 2943#ifdef IEEE80211_SUPPORT_MESH 2944 if (vap->iv_opmode == IEEE80211_M_MBSS) 2945 ieee80211_mesh_update_beacon(vap, bo); 2946#endif 2947 2948 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2949 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2950 struct ieee80211_tim_ie *tie = 2951 (struct ieee80211_tim_ie *) bo->bo_tim; 2952 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2953 u_int timlen, timoff, i; 2954 /* 2955 * ATIM/DTIM needs updating. If it fits in the 2956 * current space allocated then just copy in the 2957 * new bits. Otherwise we need to move any trailing 2958 * data to make room. Note that we know there is 2959 * contiguous space because ieee80211_beacon_allocate 2960 * insures there is space in the mbuf to write a 2961 * maximal-size virtual bitmap (based on iv_max_aid). 2962 */ 2963 /* 2964 * Calculate the bitmap size and offset, copy any 2965 * trailer out of the way, and then copy in the 2966 * new bitmap and update the information element. 2967 * Note that the tim bitmap must contain at least 2968 * one byte and any offset must be even. 2969 */ 2970 if (vap->iv_ps_pending != 0) { 2971 timoff = 128; /* impossibly large */ 2972 for (i = 0; i < vap->iv_tim_len; i++) 2973 if (vap->iv_tim_bitmap[i]) { 2974 timoff = i &~ 1; 2975 break; 2976 } 2977 KASSERT(timoff != 128, ("tim bitmap empty!")); 2978 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2979 if (vap->iv_tim_bitmap[i]) 2980 break; 2981 timlen = 1 + (i - timoff); 2982 } else { 2983 timoff = 0; 2984 timlen = 1; 2985 } 2986 if (timlen != bo->bo_tim_len) { 2987 /* copy up/down trailer */ 2988 int adjust = tie->tim_bitmap+timlen 2989 - bo->bo_tim_trailer; 2990 ovbcopy(bo->bo_tim_trailer, 2991 bo->bo_tim_trailer+adjust, 2992 bo->bo_tim_trailer_len); 2993 bo->bo_tim_trailer += adjust; 2994 bo->bo_erp += adjust; 2995 bo->bo_htinfo += adjust; 2996#ifdef IEEE80211_SUPPORT_SUPERG 2997 bo->bo_ath += adjust; 2998#endif 2999#ifdef IEEE80211_SUPPORT_TDMA 3000 bo->bo_tdma += adjust; 3001#endif 3002#ifdef IEEE80211_SUPPORT_MESH 3003 bo->bo_meshconf += adjust; 3004#endif 3005 bo->bo_appie += adjust; 3006 bo->bo_wme += adjust; 3007 bo->bo_csa += adjust; 3008 bo->bo_quiet += adjust; 3009 bo->bo_tim_len = timlen; 3010 3011 /* update information element */ 3012 tie->tim_len = 3 + timlen; 3013 tie->tim_bitctl = timoff; 3014 len_changed = 1; 3015 } 3016 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3017 bo->bo_tim_len); 3018 3019 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3020 3021 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3022 "%s: TIM updated, pending %u, off %u, len %u\n", 3023 __func__, vap->iv_ps_pending, timoff, timlen); 3024 } 3025 /* count down DTIM period */ 3026 if (tie->tim_count == 0) 3027 tie->tim_count = tie->tim_period - 1; 3028 else 3029 tie->tim_count--; 3030 /* update state for buffered multicast frames on DTIM */ 3031 if (mcast && tie->tim_count == 0) 3032 tie->tim_bitctl |= 1; 3033 else 3034 tie->tim_bitctl &= ~1; 3035 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3036 struct ieee80211_csa_ie *csa = 3037 (struct ieee80211_csa_ie *) bo->bo_csa; 3038 3039 /* 3040 * Insert or update CSA ie. If we're just starting 3041 * to count down to the channel switch then we need 3042 * to insert the CSA ie. Otherwise we just need to 3043 * drop the count. The actual change happens above 3044 * when the vap's count reaches the target count. 3045 */ 3046 if (vap->iv_csa_count == 0) { 3047 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3048 bo->bo_erp += sizeof(*csa); 3049 bo->bo_htinfo += sizeof(*csa); 3050 bo->bo_wme += sizeof(*csa); 3051#ifdef IEEE80211_SUPPORT_SUPERG 3052 bo->bo_ath += sizeof(*csa); 3053#endif 3054#ifdef IEEE80211_SUPPORT_TDMA 3055 bo->bo_tdma += sizeof(*csa); 3056#endif 3057#ifdef IEEE80211_SUPPORT_MESH 3058 bo->bo_meshconf += sizeof(*csa); 3059#endif 3060 bo->bo_appie += sizeof(*csa); 3061 bo->bo_csa_trailer_len += sizeof(*csa); 3062 bo->bo_quiet += sizeof(*csa); 3063 bo->bo_tim_trailer_len += sizeof(*csa); 3064 m->m_len += sizeof(*csa); 3065 m->m_pkthdr.len += sizeof(*csa); 3066 3067 ieee80211_add_csa(bo->bo_csa, vap); 3068 } else 3069 csa->csa_count--; 3070 vap->iv_csa_count++; 3071 /* NB: don't clear IEEE80211_BEACON_CSA */ 3072 } 3073 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3074 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3075 if (vap->iv_quiet) 3076 ieee80211_add_quiet(bo->bo_quiet, vap); 3077 } 3078 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3079 /* 3080 * ERP element needs updating. 3081 */ 3082 (void) ieee80211_add_erp(bo->bo_erp, ic); 3083 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3084 } 3085#ifdef IEEE80211_SUPPORT_SUPERG 3086 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3087 ieee80211_add_athcaps(bo->bo_ath, ni); 3088 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3089 } 3090#endif 3091 } 3092 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3093 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3094 int aielen; 3095 uint8_t *frm; 3096 3097 aielen = 0; 3098 if (aie != NULL) 3099 aielen += aie->ie_len; 3100 if (aielen != bo->bo_appie_len) { 3101 /* copy up/down trailer */ 3102 int adjust = aielen - bo->bo_appie_len; 3103 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3104 bo->bo_tim_trailer_len); 3105 bo->bo_tim_trailer += adjust; 3106 bo->bo_appie += adjust; 3107 bo->bo_appie_len = aielen; 3108 3109 len_changed = 1; 3110 } 3111 frm = bo->bo_appie; 3112 if (aie != NULL) 3113 frm = add_appie(frm, aie); 3114 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3115 } 3116 IEEE80211_UNLOCK(ic); 3117 3118 return len_changed; 3119} 3120