ieee80211_output.c revision 195845
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 195845 2009-07-24 15:22:12Z sam $"); 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#ifdef INET 61#include <netinet/in.h> 62#include <netinet/if_ether.h> 63#include <netinet/in_systm.h> 64#include <netinet/ip.h> 65#endif 66#ifdef INET6 67#include <netinet/ip6.h> 68#endif 69 70#include <security/mac/mac_framework.h> 71 72#define ETHER_HEADER_COPY(dst, src) \ 73 memcpy(dst, src, sizeof(struct ether_header)) 74 75/* unalligned little endian access */ 76#define LE_WRITE_2(p, v) do { \ 77 ((uint8_t *)(p))[0] = (v) & 0xff; \ 78 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 79} while (0) 80#define LE_WRITE_4(p, v) do { \ 81 ((uint8_t *)(p))[0] = (v) & 0xff; \ 82 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 83 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 84 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 85} while (0) 86 87static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 88 u_int hdrsize, u_int ciphdrsize, u_int mtu); 89static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 90 91#ifdef IEEE80211_DEBUG 92/* 93 * Decide if an outbound management frame should be 94 * printed when debugging is enabled. This filters some 95 * of the less interesting frames that come frequently 96 * (e.g. beacons). 97 */ 98static __inline int 99doprint(struct ieee80211vap *vap, int subtype) 100{ 101 switch (subtype) { 102 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 103 return (vap->iv_opmode == IEEE80211_M_IBSS); 104 } 105 return 1; 106} 107#endif 108 109/* 110 * Start method for vap's. All packets from the stack come 111 * through here. We handle common processing of the packets 112 * before dispatching them to the underlying device. 113 */ 114void 115ieee80211_start(struct ifnet *ifp) 116{ 117#define IS_DWDS(vap) \ 118 (vap->iv_opmode == IEEE80211_M_WDS && \ 119 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 120 struct ieee80211vap *vap = ifp->if_softc; 121 struct ieee80211com *ic = vap->iv_ic; 122 struct ifnet *parent = ic->ic_ifp; 123 struct ieee80211_node *ni; 124 struct mbuf *m; 125 struct ether_header *eh; 126 int error; 127 128 /* NB: parent must be up and running */ 129 if (!IFNET_IS_UP_RUNNING(parent)) { 130 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 131 "%s: ignore queue, parent %s not up+running\n", 132 __func__, parent->if_xname); 133 /* XXX stat */ 134 return; 135 } 136 if (vap->iv_state == IEEE80211_S_SLEEP) { 137 /* 138 * In power save, wakeup device for transmit. 139 */ 140 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 141 return; 142 } 143 /* 144 * No data frames go out unless we're running. 145 * Note in particular this covers CAC and CSA 146 * states (though maybe we should check muting 147 * for CSA). 148 */ 149 if (vap->iv_state != IEEE80211_S_RUN) { 150 IEEE80211_LOCK(ic); 151 /* re-check under the com lock to avoid races */ 152 if (vap->iv_state != IEEE80211_S_RUN) { 153 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 154 "%s: ignore queue, in %s state\n", 155 __func__, ieee80211_state_name[vap->iv_state]); 156 vap->iv_stats.is_tx_badstate++; 157 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 158 IEEE80211_UNLOCK(ic); 159 return; 160 } 161 IEEE80211_UNLOCK(ic); 162 } 163 for (;;) { 164 IFQ_DEQUEUE(&ifp->if_snd, m); 165 if (m == NULL) 166 break; 167 /* 168 * Sanitize mbuf flags for net80211 use. We cannot 169 * clear M_PWR_SAV or M_MORE_DATA because these may 170 * be set for frames that are re-submitted from the 171 * power save queue. 172 * 173 * NB: This must be done before ieee80211_classify as 174 * it marks EAPOL in frames with M_EAPOL. 175 */ 176 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 177 /* 178 * Cancel any background scan. 179 */ 180 if (ic->ic_flags & IEEE80211_F_SCAN) 181 ieee80211_cancel_anyscan(vap); 182 /* 183 * Find the node for the destination so we can do 184 * things like power save and fast frames aggregation. 185 * 186 * NB: past this point various code assumes the first 187 * mbuf has the 802.3 header present (and contiguous). 188 */ 189 ni = NULL; 190 if (m->m_len < sizeof(struct ether_header) && 191 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 192 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 193 "discard frame, %s\n", "m_pullup failed"); 194 vap->iv_stats.is_tx_nobuf++; /* XXX */ 195 ifp->if_oerrors++; 196 continue; 197 } 198 eh = mtod(m, struct ether_header *); 199 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 200 if (IS_DWDS(vap)) { 201 /* 202 * Only unicast frames from the above go out 203 * DWDS vaps; multicast frames are handled by 204 * dispatching the frame as it comes through 205 * the AP vap (see below). 206 */ 207 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 208 eh->ether_dhost, "mcast", "%s", "on DWDS"); 209 vap->iv_stats.is_dwds_mcast++; 210 m_freem(m); 211 continue; 212 } 213 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 214 /* 215 * Spam DWDS vap's w/ multicast traffic. 216 */ 217 /* XXX only if dwds in use? */ 218 ieee80211_dwds_mcast(vap, m); 219 } 220 } 221#ifdef IEEE80211_SUPPORT_MESH 222 if (vap->iv_opmode != IEEE80211_M_MBSS) { 223#endif 224 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 225 if (ni == NULL) { 226 /* NB: ieee80211_find_txnode does stat+msg */ 227 ifp->if_oerrors++; 228 m_freem(m); 229 continue; 230 } 231 if (ni->ni_associd == 0 && 232 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 233 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 234 eh->ether_dhost, NULL, 235 "sta not associated (type 0x%04x)", 236 htons(eh->ether_type)); 237 vap->iv_stats.is_tx_notassoc++; 238 ifp->if_oerrors++; 239 m_freem(m); 240 ieee80211_free_node(ni); 241 continue; 242 } 243#ifdef IEEE80211_SUPPORT_MESH 244 } else { 245 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 246 /* 247 * Proxy station only if configured. 248 */ 249 if (!ieee80211_mesh_isproxyena(vap)) { 250 IEEE80211_DISCARD_MAC(vap, 251 IEEE80211_MSG_OUTPUT | 252 IEEE80211_MSG_MESH, 253 eh->ether_dhost, NULL, 254 "%s", "proxy not enabled"); 255 vap->iv_stats.is_mesh_notproxy++; 256 ifp->if_oerrors++; 257 m_freem(m); 258 continue; 259 } 260 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 261 } 262 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 263 if (ni == NULL) { 264 /* 265 * NB: ieee80211_mesh_discover holds/disposes 266 * frame (e.g. queueing on path discovery). 267 */ 268 ifp->if_oerrors++; 269 continue; 270 } 271 } 272#endif 273 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 274 (m->m_flags & M_PWR_SAV) == 0) { 275 /* 276 * Station in power save mode; pass the frame 277 * to the 802.11 layer and continue. We'll get 278 * the frame back when the time is right. 279 * XXX lose WDS vap linkage? 280 */ 281 (void) ieee80211_pwrsave(ni, m); 282 ieee80211_free_node(ni); 283 continue; 284 } 285 /* calculate priority so drivers can find the tx queue */ 286 if (ieee80211_classify(ni, m)) { 287 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 288 eh->ether_dhost, NULL, 289 "%s", "classification failure"); 290 vap->iv_stats.is_tx_classify++; 291 ifp->if_oerrors++; 292 m_freem(m); 293 ieee80211_free_node(ni); 294 continue; 295 } 296 /* 297 * Stash the node pointer. Note that we do this after 298 * any call to ieee80211_dwds_mcast because that code 299 * uses any existing value for rcvif to identify the 300 * interface it (might have been) received on. 301 */ 302 m->m_pkthdr.rcvif = (void *)ni; 303 304 BPF_MTAP(ifp, m); /* 802.3 tx */ 305 306 /* 307 * Check if A-MPDU tx aggregation is setup or if we 308 * should try to enable it. The sta must be associated 309 * with HT and A-MPDU enabled for use. When the policy 310 * routine decides we should enable A-MPDU we issue an 311 * ADDBA request and wait for a reply. The frame being 312 * encapsulated will go out w/o using A-MPDU, or possibly 313 * it might be collected by the driver and held/retransmit. 314 * The default ic_ampdu_enable routine handles staggering 315 * ADDBA requests in case the receiver NAK's us or we are 316 * otherwise unable to establish a BA stream. 317 */ 318 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 319 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 320 (m->m_flags & M_EAPOL) == 0) { 321 const int ac = M_WME_GETAC(m); 322 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 323 324 ieee80211_txampdu_count_packet(tap); 325 if (IEEE80211_AMPDU_RUNNING(tap)) { 326 /* 327 * Operational, mark frame for aggregation. 328 * 329 * XXX do tx aggregation here 330 */ 331 m->m_flags |= M_AMPDU_MPDU; 332 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 333 ic->ic_ampdu_enable(ni, tap)) { 334 /* 335 * Not negotiated yet, request service. 336 */ 337 ieee80211_ampdu_request(ni, tap); 338 /* XXX hold frame for reply? */ 339 } 340 } 341#ifdef IEEE80211_SUPPORT_SUPERG 342 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 343 m = ieee80211_ff_check(ni, m); 344 if (m == NULL) { 345 /* NB: any ni ref held on stageq */ 346 continue; 347 } 348 } 349#endif /* IEEE80211_SUPPORT_SUPERG */ 350 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 351 /* 352 * Encapsulate the packet in prep for transmission. 353 */ 354 m = ieee80211_encap(vap, ni, m); 355 if (m == NULL) { 356 /* NB: stat+msg handled in ieee80211_encap */ 357 ieee80211_free_node(ni); 358 continue; 359 } 360 } 361 362 error = parent->if_transmit(parent, m); 363 if (error != 0) { 364 /* NB: IFQ_HANDOFF reclaims mbuf */ 365 ieee80211_free_node(ni); 366 } else { 367 ifp->if_opackets++; 368 } 369 ic->ic_lastdata = ticks; 370 } 371#undef IS_DWDS 372} 373 374/* 375 * 802.11 output routine. This is (currently) used only to 376 * connect bpf write calls to the 802.11 layer for injecting 377 * raw 802.11 frames. 378 */ 379int 380ieee80211_output(struct ifnet *ifp, struct mbuf *m, 381 struct sockaddr *dst, struct route *ro) 382{ 383#define senderr(e) do { error = (e); goto bad;} while (0) 384 struct ieee80211_node *ni = NULL; 385 struct ieee80211vap *vap = ifp->if_softc; 386 struct ieee80211_frame *wh; 387 int error; 388 389 /* 390 * Hand to the 802.3 code if not tagged as 391 * a raw 802.11 frame. 392 */ 393 if (dst->sa_family != AF_IEEE80211) 394 return vap->iv_output(ifp, m, dst, ro); 395#ifdef MAC 396 error = mac_ifnet_check_transmit(ifp, m); 397 if (error) 398 senderr(error); 399#endif 400 if (ifp->if_flags & IFF_MONITOR) 401 senderr(ENETDOWN); 402 if (!IFNET_IS_UP_RUNNING(ifp)) 403 senderr(ENETDOWN); 404 if (vap->iv_state == IEEE80211_S_CAC) { 405 IEEE80211_DPRINTF(vap, 406 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 407 "block %s frame in CAC state\n", "raw data"); 408 vap->iv_stats.is_tx_badstate++; 409 senderr(EIO); /* XXX */ 410 } 411 /* XXX bypass bridge, pfil, carp, etc. */ 412 413 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 414 senderr(EIO); /* XXX */ 415 wh = mtod(m, struct ieee80211_frame *); 416 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 417 IEEE80211_FC0_VERSION_0) 418 senderr(EIO); /* XXX */ 419 420 /* locate destination node */ 421 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 422 case IEEE80211_FC1_DIR_NODS: 423 case IEEE80211_FC1_DIR_FROMDS: 424 ni = ieee80211_find_txnode(vap, wh->i_addr1); 425 break; 426 case IEEE80211_FC1_DIR_TODS: 427 case IEEE80211_FC1_DIR_DSTODS: 428 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 429 senderr(EIO); /* XXX */ 430 ni = ieee80211_find_txnode(vap, wh->i_addr3); 431 break; 432 default: 433 senderr(EIO); /* XXX */ 434 } 435 if (ni == NULL) { 436 /* 437 * Permit packets w/ bpf params through regardless 438 * (see below about sa_len). 439 */ 440 if (dst->sa_len == 0) 441 senderr(EHOSTUNREACH); 442 ni = ieee80211_ref_node(vap->iv_bss); 443 } 444 445 /* 446 * Sanitize mbuf for net80211 flags leaked from above. 447 * 448 * NB: This must be done before ieee80211_classify as 449 * it marks EAPOL in frames with M_EAPOL. 450 */ 451 m->m_flags &= ~M_80211_TX; 452 453 /* calculate priority so drivers can find the tx queue */ 454 /* XXX assumes an 802.3 frame */ 455 if (ieee80211_classify(ni, m)) 456 senderr(EIO); /* XXX */ 457 458 ifp->if_opackets++; 459 IEEE80211_NODE_STAT(ni, tx_data); 460 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 461 IEEE80211_NODE_STAT(ni, tx_mcast); 462 m->m_flags |= M_MCAST; 463 } else 464 IEEE80211_NODE_STAT(ni, tx_ucast); 465 /* NB: ieee80211_encap does not include 802.11 header */ 466 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 467 468 /* 469 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 470 * present by setting the sa_len field of the sockaddr (yes, 471 * this is a hack). 472 * NB: we assume sa_data is suitably aligned to cast. 473 */ 474 return vap->iv_ic->ic_raw_xmit(ni, m, 475 (const struct ieee80211_bpf_params *)(dst->sa_len ? 476 dst->sa_data : NULL)); 477bad: 478 if (m != NULL) 479 m_freem(m); 480 if (ni != NULL) 481 ieee80211_free_node(ni); 482 ifp->if_oerrors++; 483 return error; 484#undef senderr 485} 486 487/* 488 * Set the direction field and address fields of an outgoing 489 * frame. Note this should be called early on in constructing 490 * a frame as it sets i_fc[1]; other bits can then be or'd in. 491 */ 492void 493ieee80211_send_setup( 494 struct ieee80211_node *ni, 495 struct mbuf *m, 496 int type, int tid, 497 const uint8_t sa[IEEE80211_ADDR_LEN], 498 const uint8_t da[IEEE80211_ADDR_LEN], 499 const uint8_t bssid[IEEE80211_ADDR_LEN]) 500{ 501#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 502 struct ieee80211vap *vap = ni->ni_vap; 503 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 504 ieee80211_seq seqno; 505 506 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 507 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 508 switch (vap->iv_opmode) { 509 case IEEE80211_M_STA: 510 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 511 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 512 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 513 IEEE80211_ADDR_COPY(wh->i_addr3, da); 514 break; 515 case IEEE80211_M_IBSS: 516 case IEEE80211_M_AHDEMO: 517 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 518 IEEE80211_ADDR_COPY(wh->i_addr1, da); 519 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 520 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 521 break; 522 case IEEE80211_M_HOSTAP: 523 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 524 IEEE80211_ADDR_COPY(wh->i_addr1, da); 525 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 526 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 527 break; 528 case IEEE80211_M_WDS: 529 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 530 IEEE80211_ADDR_COPY(wh->i_addr1, da); 531 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 532 IEEE80211_ADDR_COPY(wh->i_addr3, da); 533 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 534 break; 535 case IEEE80211_M_MBSS: 536#ifdef IEEE80211_SUPPORT_MESH 537 /* XXX add support for proxied addresses */ 538 if (IEEE80211_IS_MULTICAST(da)) { 539 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 540 /* XXX next hop */ 541 IEEE80211_ADDR_COPY(wh->i_addr1, da); 542 IEEE80211_ADDR_COPY(wh->i_addr2, 543 vap->iv_myaddr); 544 } else { 545 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 546 IEEE80211_ADDR_COPY(wh->i_addr1, da); 547 IEEE80211_ADDR_COPY(wh->i_addr2, 548 vap->iv_myaddr); 549 IEEE80211_ADDR_COPY(wh->i_addr3, da); 550 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 551 } 552#endif 553 break; 554 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 555 break; 556 } 557 } else { 558 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 559 IEEE80211_ADDR_COPY(wh->i_addr1, da); 560 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 561#ifdef IEEE80211_SUPPORT_MESH 562 if (vap->iv_opmode == IEEE80211_M_MBSS) 563 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 564 else 565#endif 566 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 567 } 568 *(uint16_t *)&wh->i_dur[0] = 0; 569 570 seqno = ni->ni_txseqs[tid]++; 571 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 572 M_SEQNO_SET(m, seqno); 573 574 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 575 m->m_flags |= M_MCAST; 576#undef WH4 577} 578 579/* 580 * Send a management frame to the specified node. The node pointer 581 * must have a reference as the pointer will be passed to the driver 582 * and potentially held for a long time. If the frame is successfully 583 * dispatched to the driver, then it is responsible for freeing the 584 * reference (and potentially free'ing up any associated storage); 585 * otherwise deal with reclaiming any reference (on error). 586 */ 587int 588ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 589 struct ieee80211_bpf_params *params) 590{ 591 struct ieee80211vap *vap = ni->ni_vap; 592 struct ieee80211com *ic = ni->ni_ic; 593 struct ieee80211_frame *wh; 594 595 KASSERT(ni != NULL, ("null node")); 596 597 if (vap->iv_state == IEEE80211_S_CAC) { 598 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 599 ni, "block %s frame in CAC state", 600 ieee80211_mgt_subtype_name[ 601 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 602 IEEE80211_FC0_SUBTYPE_SHIFT]); 603 vap->iv_stats.is_tx_badstate++; 604 ieee80211_free_node(ni); 605 m_freem(m); 606 return EIO; /* XXX */ 607 } 608 609 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 610 if (m == NULL) { 611 ieee80211_free_node(ni); 612 return ENOMEM; 613 } 614 615 wh = mtod(m, struct ieee80211_frame *); 616 ieee80211_send_setup(ni, m, 617 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 618 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 619 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 620 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 621 "encrypting frame (%s)", __func__); 622 wh->i_fc[1] |= IEEE80211_FC1_WEP; 623 } 624 m->m_flags |= M_ENCAP; /* mark encapsulated */ 625 626 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 627 M_WME_SETAC(m, params->ibp_pri); 628 629#ifdef IEEE80211_DEBUG 630 /* avoid printing too many frames */ 631 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 632 ieee80211_msg_dumppkts(vap)) { 633 printf("[%s] send %s on channel %u\n", 634 ether_sprintf(wh->i_addr1), 635 ieee80211_mgt_subtype_name[ 636 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 637 IEEE80211_FC0_SUBTYPE_SHIFT], 638 ieee80211_chan2ieee(ic, ic->ic_curchan)); 639 } 640#endif 641 IEEE80211_NODE_STAT(ni, tx_mgmt); 642 643 return ic->ic_raw_xmit(ni, m, params); 644} 645 646/* 647 * Send a null data frame to the specified node. If the station 648 * is setup for QoS then a QoS Null Data frame is constructed. 649 * If this is a WDS station then a 4-address frame is constructed. 650 * 651 * NB: the caller is assumed to have setup a node reference 652 * for use; this is necessary to deal with a race condition 653 * when probing for inactive stations. Like ieee80211_mgmt_output 654 * we must cleanup any node reference on error; however we 655 * can safely just unref it as we know it will never be the 656 * last reference to the node. 657 */ 658int 659ieee80211_send_nulldata(struct ieee80211_node *ni) 660{ 661 struct ieee80211vap *vap = ni->ni_vap; 662 struct ieee80211com *ic = ni->ni_ic; 663 struct mbuf *m; 664 struct ieee80211_frame *wh; 665 int hdrlen; 666 uint8_t *frm; 667 668 if (vap->iv_state == IEEE80211_S_CAC) { 669 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 670 ni, "block %s frame in CAC state", "null data"); 671 ieee80211_unref_node(&ni); 672 vap->iv_stats.is_tx_badstate++; 673 return EIO; /* XXX */ 674 } 675 676 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 677 hdrlen = sizeof(struct ieee80211_qosframe); 678 else 679 hdrlen = sizeof(struct ieee80211_frame); 680 /* NB: only WDS vap's get 4-address frames */ 681 if (vap->iv_opmode == IEEE80211_M_WDS) 682 hdrlen += IEEE80211_ADDR_LEN; 683 if (ic->ic_flags & IEEE80211_F_DATAPAD) 684 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 685 686 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 687 if (m == NULL) { 688 /* XXX debug msg */ 689 ieee80211_unref_node(&ni); 690 vap->iv_stats.is_tx_nobuf++; 691 return ENOMEM; 692 } 693 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 694 ("leading space %zd", M_LEADINGSPACE(m))); 695 M_PREPEND(m, hdrlen, M_DONTWAIT); 696 if (m == NULL) { 697 /* NB: cannot happen */ 698 ieee80211_free_node(ni); 699 return ENOMEM; 700 } 701 702 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 703 if (ni->ni_flags & IEEE80211_NODE_QOS) { 704 const int tid = WME_AC_TO_TID(WME_AC_BE); 705 uint8_t *qos; 706 707 ieee80211_send_setup(ni, m, 708 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 709 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 710 711 if (vap->iv_opmode == IEEE80211_M_WDS) 712 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 713 else 714 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 715 qos[0] = tid & IEEE80211_QOS_TID; 716 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 717 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 718 qos[1] = 0; 719 } else { 720 ieee80211_send_setup(ni, m, 721 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 722 IEEE80211_NONQOS_TID, 723 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 724 } 725 if (vap->iv_opmode != IEEE80211_M_WDS) { 726 /* NB: power management bit is never sent by an AP */ 727 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 728 vap->iv_opmode != IEEE80211_M_HOSTAP) 729 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 730 } 731 m->m_len = m->m_pkthdr.len = hdrlen; 732 m->m_flags |= M_ENCAP; /* mark encapsulated */ 733 734 M_WME_SETAC(m, WME_AC_BE); 735 736 IEEE80211_NODE_STAT(ni, tx_data); 737 738 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 739 "send %snull data frame on channel %u, pwr mgt %s", 740 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 741 ieee80211_chan2ieee(ic, ic->ic_curchan), 742 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 743 744 return ic->ic_raw_xmit(ni, m, NULL); 745} 746 747/* 748 * Assign priority to a frame based on any vlan tag assigned 749 * to the station and/or any Diffserv setting in an IP header. 750 * Finally, if an ACM policy is setup (in station mode) it's 751 * applied. 752 */ 753int 754ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 755{ 756 const struct ether_header *eh = mtod(m, struct ether_header *); 757 int v_wme_ac, d_wme_ac, ac; 758 759 /* 760 * Always promote PAE/EAPOL frames to high priority. 761 */ 762 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 763 /* NB: mark so others don't need to check header */ 764 m->m_flags |= M_EAPOL; 765 ac = WME_AC_VO; 766 goto done; 767 } 768 /* 769 * Non-qos traffic goes to BE. 770 */ 771 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 772 ac = WME_AC_BE; 773 goto done; 774 } 775 776 /* 777 * If node has a vlan tag then all traffic 778 * to it must have a matching tag. 779 */ 780 v_wme_ac = 0; 781 if (ni->ni_vlan != 0) { 782 if ((m->m_flags & M_VLANTAG) == 0) { 783 IEEE80211_NODE_STAT(ni, tx_novlantag); 784 return 1; 785 } 786 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 787 EVL_VLANOFTAG(ni->ni_vlan)) { 788 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 789 return 1; 790 } 791 /* map vlan priority to AC */ 792 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 793 } 794 795 /* XXX m_copydata may be too slow for fast path */ 796#ifdef INET 797 if (eh->ether_type == htons(ETHERTYPE_IP)) { 798 uint8_t tos; 799 /* 800 * IP frame, map the DSCP bits from the TOS field. 801 */ 802 /* NB: ip header may not be in first mbuf */ 803 m_copydata(m, sizeof(struct ether_header) + 804 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 805 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 806 d_wme_ac = TID_TO_WME_AC(tos); 807 } else { 808#endif /* INET */ 809#ifdef INET6 810 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 811 uint32_t flow; 812 uint8_t tos; 813 /* 814 * IPv6 frame, map the DSCP bits from the TOS field. 815 */ 816 m_copydata(m, sizeof(struct ether_header) + 817 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 818 (caddr_t) &flow); 819 tos = (uint8_t)(ntohl(flow) >> 20); 820 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 821 d_wme_ac = TID_TO_WME_AC(tos); 822 } else { 823#endif /* INET6 */ 824 d_wme_ac = WME_AC_BE; 825#ifdef INET6 826 } 827#endif 828#ifdef INET 829 } 830#endif 831 /* 832 * Use highest priority AC. 833 */ 834 if (v_wme_ac > d_wme_ac) 835 ac = v_wme_ac; 836 else 837 ac = d_wme_ac; 838 839 /* 840 * Apply ACM policy. 841 */ 842 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 843 static const int acmap[4] = { 844 WME_AC_BK, /* WME_AC_BE */ 845 WME_AC_BK, /* WME_AC_BK */ 846 WME_AC_BE, /* WME_AC_VI */ 847 WME_AC_VI, /* WME_AC_VO */ 848 }; 849 struct ieee80211com *ic = ni->ni_ic; 850 851 while (ac != WME_AC_BK && 852 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 853 ac = acmap[ac]; 854 } 855done: 856 M_WME_SETAC(m, ac); 857 return 0; 858} 859 860/* 861 * Insure there is sufficient contiguous space to encapsulate the 862 * 802.11 data frame. If room isn't already there, arrange for it. 863 * Drivers and cipher modules assume we have done the necessary work 864 * and fail rudely if they don't find the space they need. 865 */ 866struct mbuf * 867ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 868 struct ieee80211_key *key, struct mbuf *m) 869{ 870#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 871 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 872 873 if (key != NULL) { 874 /* XXX belongs in crypto code? */ 875 needed_space += key->wk_cipher->ic_header; 876 /* XXX frags */ 877 /* 878 * When crypto is being done in the host we must insure 879 * the data are writable for the cipher routines; clone 880 * a writable mbuf chain. 881 * XXX handle SWMIC specially 882 */ 883 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 884 m = m_unshare(m, M_NOWAIT); 885 if (m == NULL) { 886 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 887 "%s: cannot get writable mbuf\n", __func__); 888 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 889 return NULL; 890 } 891 } 892 } 893 /* 894 * We know we are called just before stripping an Ethernet 895 * header and prepending an LLC header. This means we know 896 * there will be 897 * sizeof(struct ether_header) - sizeof(struct llc) 898 * bytes recovered to which we need additional space for the 899 * 802.11 header and any crypto header. 900 */ 901 /* XXX check trailing space and copy instead? */ 902 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 903 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 904 if (n == NULL) { 905 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 906 "%s: cannot expand storage\n", __func__); 907 vap->iv_stats.is_tx_nobuf++; 908 m_freem(m); 909 return NULL; 910 } 911 KASSERT(needed_space <= MHLEN, 912 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 913 /* 914 * Setup new mbuf to have leading space to prepend the 915 * 802.11 header and any crypto header bits that are 916 * required (the latter are added when the driver calls 917 * back to ieee80211_crypto_encap to do crypto encapsulation). 918 */ 919 /* NB: must be first 'cuz it clobbers m_data */ 920 m_move_pkthdr(n, m); 921 n->m_len = 0; /* NB: m_gethdr does not set */ 922 n->m_data += needed_space; 923 /* 924 * Pull up Ethernet header to create the expected layout. 925 * We could use m_pullup but that's overkill (i.e. we don't 926 * need the actual data) and it cannot fail so do it inline 927 * for speed. 928 */ 929 /* NB: struct ether_header is known to be contiguous */ 930 n->m_len += sizeof(struct ether_header); 931 m->m_len -= sizeof(struct ether_header); 932 m->m_data += sizeof(struct ether_header); 933 /* 934 * Replace the head of the chain. 935 */ 936 n->m_next = m; 937 m = n; 938 } 939 return m; 940#undef TO_BE_RECLAIMED 941} 942 943/* 944 * Return the transmit key to use in sending a unicast frame. 945 * If a unicast key is set we use that. When no unicast key is set 946 * we fall back to the default transmit key. 947 */ 948static __inline struct ieee80211_key * 949ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 950 struct ieee80211_node *ni) 951{ 952 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 953 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 954 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 955 return NULL; 956 return &vap->iv_nw_keys[vap->iv_def_txkey]; 957 } else { 958 return &ni->ni_ucastkey; 959 } 960} 961 962/* 963 * Return the transmit key to use in sending a multicast frame. 964 * Multicast traffic always uses the group key which is installed as 965 * the default tx key. 966 */ 967static __inline struct ieee80211_key * 968ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 969 struct ieee80211_node *ni) 970{ 971 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 972 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 973 return NULL; 974 return &vap->iv_nw_keys[vap->iv_def_txkey]; 975} 976 977/* 978 * Encapsulate an outbound data frame. The mbuf chain is updated. 979 * If an error is encountered NULL is returned. The caller is required 980 * to provide a node reference and pullup the ethernet header in the 981 * first mbuf. 982 * 983 * NB: Packet is assumed to be processed by ieee80211_classify which 984 * marked EAPOL frames w/ M_EAPOL. 985 */ 986struct mbuf * 987ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 988 struct mbuf *m) 989{ 990#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 991 struct ieee80211com *ic = ni->ni_ic; 992#ifdef IEEE80211_SUPPORT_MESH 993 struct ieee80211_mesh_state *ms = vap->iv_mesh; 994 struct ieee80211_meshcntl_ae10 *mc; 995#endif 996 struct ether_header eh; 997 struct ieee80211_frame *wh; 998 struct ieee80211_key *key; 999 struct llc *llc; 1000 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1001 ieee80211_seq seqno; 1002 int meshhdrsize, meshae; 1003 uint8_t *qos; 1004 1005 /* 1006 * Copy existing Ethernet header to a safe place. The 1007 * rest of the code assumes it's ok to strip it when 1008 * reorganizing state for the final encapsulation. 1009 */ 1010 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1011 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1012 1013 /* 1014 * Insure space for additional headers. First identify 1015 * transmit key to use in calculating any buffer adjustments 1016 * required. This is also used below to do privacy 1017 * encapsulation work. Then calculate the 802.11 header 1018 * size and any padding required by the driver. 1019 * 1020 * Note key may be NULL if we fall back to the default 1021 * transmit key and that is not set. In that case the 1022 * buffer may not be expanded as needed by the cipher 1023 * routines, but they will/should discard it. 1024 */ 1025 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1026 if (vap->iv_opmode == IEEE80211_M_STA || 1027 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1028 (vap->iv_opmode == IEEE80211_M_WDS && 1029 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1030 key = ieee80211_crypto_getucastkey(vap, ni); 1031 else 1032 key = ieee80211_crypto_getmcastkey(vap, ni); 1033 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1034 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1035 eh.ether_dhost, 1036 "no default transmit key (%s) deftxkey %u", 1037 __func__, vap->iv_def_txkey); 1038 vap->iv_stats.is_tx_nodefkey++; 1039 goto bad; 1040 } 1041 } else 1042 key = NULL; 1043 /* 1044 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1045 * frames so suppress use. This may be an issue if other 1046 * ap's require all data frames to be QoS-encapsulated 1047 * once negotiated in which case we'll need to make this 1048 * configurable. 1049 */ 1050 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1051 (m->m_flags & M_EAPOL) == 0; 1052 if (addqos) 1053 hdrsize = sizeof(struct ieee80211_qosframe); 1054 else 1055 hdrsize = sizeof(struct ieee80211_frame); 1056#ifdef IEEE80211_SUPPORT_MESH 1057 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1058 /* 1059 * Mesh data frames are encapsulated according to the 1060 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1061 * o Group Addressed data (aka multicast) originating 1062 * at the local sta are sent w/ 3-address format and 1063 * address extension mode 00 1064 * o Individually Addressed data (aka unicast) originating 1065 * at the local sta are sent w/ 4-address format and 1066 * address extension mode 00 1067 * o Group Addressed data forwarded from a non-mesh sta are 1068 * sent w/ 3-address format and address extension mode 01 1069 * o Individually Address data from another sta are sent 1070 * w/ 4-address format and address extension mode 10 1071 */ 1072 is4addr = 0; /* NB: don't use, disable */ 1073 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1074 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1075 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1076 /* XXX defines for AE modes */ 1077 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1078 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1079 meshae = 0; 1080 else 1081 meshae = 4; /* NB: pseudo */ 1082 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1083 meshae = 1; 1084 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1085 } else { 1086 meshae = 2; 1087 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1088 } 1089 } else { 1090#endif 1091 /* 1092 * 4-address frames need to be generated for: 1093 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1094 * o packets sent through a vap marked for relaying 1095 * (e.g. a station operating with dynamic WDS) 1096 */ 1097 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1098 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1099 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1100 if (is4addr) 1101 hdrsize += IEEE80211_ADDR_LEN; 1102 meshhdrsize = meshae = 0; 1103#ifdef IEEE80211_SUPPORT_MESH 1104 } 1105#endif 1106 /* 1107 * Honor driver DATAPAD requirement. 1108 */ 1109 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1110 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1111 else 1112 hdrspace = hdrsize; 1113 1114 if (__predict_true((m->m_flags & M_FF) == 0)) { 1115 /* 1116 * Normal frame. 1117 */ 1118 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1119 if (m == NULL) { 1120 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1121 goto bad; 1122 } 1123 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1124 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1125 llc = mtod(m, struct llc *); 1126 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1127 llc->llc_control = LLC_UI; 1128 llc->llc_snap.org_code[0] = 0; 1129 llc->llc_snap.org_code[1] = 0; 1130 llc->llc_snap.org_code[2] = 0; 1131 llc->llc_snap.ether_type = eh.ether_type; 1132 } else { 1133#ifdef IEEE80211_SUPPORT_SUPERG 1134 /* 1135 * Aggregated frame. 1136 */ 1137 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1138 if (m == NULL) 1139#endif 1140 goto bad; 1141 } 1142 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1143 1144 M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT); 1145 if (m == NULL) { 1146 vap->iv_stats.is_tx_nobuf++; 1147 goto bad; 1148 } 1149 wh = mtod(m, struct ieee80211_frame *); 1150 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1151 *(uint16_t *)wh->i_dur = 0; 1152 qos = NULL; /* NB: quiet compiler */ 1153 if (is4addr) { 1154 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1155 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1156 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1157 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1158 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1159 } else switch (vap->iv_opmode) { 1160 case IEEE80211_M_STA: 1161 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1162 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1163 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1164 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1165 break; 1166 case IEEE80211_M_IBSS: 1167 case IEEE80211_M_AHDEMO: 1168 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1169 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1170 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1171 /* 1172 * NB: always use the bssid from iv_bss as the 1173 * neighbor's may be stale after an ibss merge 1174 */ 1175 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1176 break; 1177 case IEEE80211_M_HOSTAP: 1178 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1179 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1180 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1181 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1182 break; 1183#ifdef IEEE80211_SUPPORT_MESH 1184 case IEEE80211_M_MBSS: 1185 /* NB: offset by hdrspace to deal with DATAPAD */ 1186 mc = (struct ieee80211_meshcntl_ae10 *) 1187 (mtod(m, uint8_t *) + hdrspace); 1188 switch (meshae) { 1189 case 0: /* ucast, no proxy */ 1190 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1191 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1192 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1193 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1194 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1195 mc->mc_flags = 0; 1196 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1197 break; 1198 case 4: /* mcast, no proxy */ 1199 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1200 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1201 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1202 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1203 mc->mc_flags = 0; /* NB: AE is really 0 */ 1204 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1205 break; 1206 case 1: /* mcast, proxy */ 1207 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1208 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1209 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1210 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1211 mc->mc_flags = 1; 1212 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1213 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1214 break; 1215 case 2: /* ucast, proxy */ 1216 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1217 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1218 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1219 /* XXX not right, need MeshDA */ 1220 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1221 /* XXX assume are MeshSA */ 1222 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1223 mc->mc_flags = 2; 1224 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1225 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1226 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1227 break; 1228 default: 1229 KASSERT(0, ("meshae %d", meshae)); 1230 break; 1231 } 1232 mc->mc_ttl = ms->ms_ttl; 1233 ms->ms_seq++; 1234 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1235 break; 1236#endif 1237 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1238 default: 1239 goto bad; 1240 } 1241 if (m->m_flags & M_MORE_DATA) 1242 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1243 if (addqos) { 1244 int ac, tid; 1245 1246 if (is4addr) { 1247 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1248 /* NB: mesh case handled earlier */ 1249 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1250 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1251 ac = M_WME_GETAC(m); 1252 /* map from access class/queue to 11e header priorty value */ 1253 tid = WME_AC_TO_TID(ac); 1254 qos[0] = tid & IEEE80211_QOS_TID; 1255 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1256 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1257 qos[1] = 0; 1258 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1259 1260 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1261 /* 1262 * NB: don't assign a sequence # to potential 1263 * aggregates; we expect this happens at the 1264 * point the frame comes off any aggregation q 1265 * as otherwise we may introduce holes in the 1266 * BA sequence space and/or make window accouting 1267 * more difficult. 1268 * 1269 * XXX may want to control this with a driver 1270 * capability; this may also change when we pull 1271 * aggregation up into net80211 1272 */ 1273 seqno = ni->ni_txseqs[tid]++; 1274 *(uint16_t *)wh->i_seq = 1275 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1276 M_SEQNO_SET(m, seqno); 1277 } 1278 } else { 1279 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1280 *(uint16_t *)wh->i_seq = 1281 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1282 M_SEQNO_SET(m, seqno); 1283 } 1284 1285 1286 /* check if xmit fragmentation is required */ 1287 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1288 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1289 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1290 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1291 if (key != NULL) { 1292 /* 1293 * IEEE 802.1X: send EAPOL frames always in the clear. 1294 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1295 */ 1296 if ((m->m_flags & M_EAPOL) == 0 || 1297 ((vap->iv_flags & IEEE80211_F_WPA) && 1298 (vap->iv_opmode == IEEE80211_M_STA ? 1299 !IEEE80211_KEY_UNDEFINED(key) : 1300 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1301 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1302 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1303 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1304 eh.ether_dhost, 1305 "%s", "enmic failed, discard frame"); 1306 vap->iv_stats.is_crypto_enmicfail++; 1307 goto bad; 1308 } 1309 } 1310 } 1311 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1312 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1313 goto bad; 1314 1315 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1316 1317 IEEE80211_NODE_STAT(ni, tx_data); 1318 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1319 IEEE80211_NODE_STAT(ni, tx_mcast); 1320 m->m_flags |= M_MCAST; 1321 } else 1322 IEEE80211_NODE_STAT(ni, tx_ucast); 1323 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1324 1325 return m; 1326bad: 1327 if (m != NULL) 1328 m_freem(m); 1329 return NULL; 1330#undef WH4 1331} 1332 1333/* 1334 * Fragment the frame according to the specified mtu. 1335 * The size of the 802.11 header (w/o padding) is provided 1336 * so we don't need to recalculate it. We create a new 1337 * mbuf for each fragment and chain it through m_nextpkt; 1338 * we might be able to optimize this by reusing the original 1339 * packet's mbufs but that is significantly more complicated. 1340 */ 1341static int 1342ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1343 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1344{ 1345 struct ieee80211_frame *wh, *whf; 1346 struct mbuf *m, *prev, *next; 1347 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1348 1349 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1350 KASSERT(m0->m_pkthdr.len > mtu, 1351 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1352 1353 wh = mtod(m0, struct ieee80211_frame *); 1354 /* NB: mark the first frag; it will be propagated below */ 1355 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1356 totalhdrsize = hdrsize + ciphdrsize; 1357 fragno = 1; 1358 off = mtu - ciphdrsize; 1359 remainder = m0->m_pkthdr.len - off; 1360 prev = m0; 1361 do { 1362 fragsize = totalhdrsize + remainder; 1363 if (fragsize > mtu) 1364 fragsize = mtu; 1365 /* XXX fragsize can be >2048! */ 1366 KASSERT(fragsize < MCLBYTES, 1367 ("fragment size %u too big!", fragsize)); 1368 if (fragsize > MHLEN) 1369 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1370 else 1371 m = m_gethdr(M_DONTWAIT, MT_DATA); 1372 if (m == NULL) 1373 goto bad; 1374 /* leave room to prepend any cipher header */ 1375 m_align(m, fragsize - ciphdrsize); 1376 1377 /* 1378 * Form the header in the fragment. Note that since 1379 * we mark the first fragment with the MORE_FRAG bit 1380 * it automatically is propagated to each fragment; we 1381 * need only clear it on the last fragment (done below). 1382 */ 1383 whf = mtod(m, struct ieee80211_frame *); 1384 memcpy(whf, wh, hdrsize); 1385 *(uint16_t *)&whf->i_seq[0] |= htole16( 1386 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1387 IEEE80211_SEQ_FRAG_SHIFT); 1388 fragno++; 1389 1390 payload = fragsize - totalhdrsize; 1391 /* NB: destination is known to be contiguous */ 1392 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1393 m->m_len = hdrsize + payload; 1394 m->m_pkthdr.len = hdrsize + payload; 1395 m->m_flags |= M_FRAG; 1396 1397 /* chain up the fragment */ 1398 prev->m_nextpkt = m; 1399 prev = m; 1400 1401 /* deduct fragment just formed */ 1402 remainder -= payload; 1403 off += payload; 1404 } while (remainder != 0); 1405 1406 /* set the last fragment */ 1407 m->m_flags |= M_LASTFRAG; 1408 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1409 1410 /* strip first mbuf now that everything has been copied */ 1411 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1412 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1413 1414 vap->iv_stats.is_tx_fragframes++; 1415 vap->iv_stats.is_tx_frags += fragno-1; 1416 1417 return 1; 1418bad: 1419 /* reclaim fragments but leave original frame for caller to free */ 1420 for (m = m0->m_nextpkt; m != NULL; m = next) { 1421 next = m->m_nextpkt; 1422 m->m_nextpkt = NULL; /* XXX paranoid */ 1423 m_freem(m); 1424 } 1425 m0->m_nextpkt = NULL; 1426 return 0; 1427} 1428 1429/* 1430 * Add a supported rates element id to a frame. 1431 */ 1432uint8_t * 1433ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1434{ 1435 int nrates; 1436 1437 *frm++ = IEEE80211_ELEMID_RATES; 1438 nrates = rs->rs_nrates; 1439 if (nrates > IEEE80211_RATE_SIZE) 1440 nrates = IEEE80211_RATE_SIZE; 1441 *frm++ = nrates; 1442 memcpy(frm, rs->rs_rates, nrates); 1443 return frm + nrates; 1444} 1445 1446/* 1447 * Add an extended supported rates element id to a frame. 1448 */ 1449uint8_t * 1450ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1451{ 1452 /* 1453 * Add an extended supported rates element if operating in 11g mode. 1454 */ 1455 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1456 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1457 *frm++ = IEEE80211_ELEMID_XRATES; 1458 *frm++ = nrates; 1459 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1460 frm += nrates; 1461 } 1462 return frm; 1463} 1464 1465/* 1466 * Add an ssid element to a frame. 1467 */ 1468static uint8_t * 1469ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1470{ 1471 *frm++ = IEEE80211_ELEMID_SSID; 1472 *frm++ = len; 1473 memcpy(frm, ssid, len); 1474 return frm + len; 1475} 1476 1477/* 1478 * Add an erp element to a frame. 1479 */ 1480static uint8_t * 1481ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1482{ 1483 uint8_t erp; 1484 1485 *frm++ = IEEE80211_ELEMID_ERP; 1486 *frm++ = 1; 1487 erp = 0; 1488 if (ic->ic_nonerpsta != 0) 1489 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1490 if (ic->ic_flags & IEEE80211_F_USEPROT) 1491 erp |= IEEE80211_ERP_USE_PROTECTION; 1492 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1493 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1494 *frm++ = erp; 1495 return frm; 1496} 1497 1498/* 1499 * Add a CFParams element to a frame. 1500 */ 1501static uint8_t * 1502ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1503{ 1504#define ADDSHORT(frm, v) do { \ 1505 LE_WRITE_2(frm, v); \ 1506 frm += 2; \ 1507} while (0) 1508 *frm++ = IEEE80211_ELEMID_CFPARMS; 1509 *frm++ = 6; 1510 *frm++ = 0; /* CFP count */ 1511 *frm++ = 2; /* CFP period */ 1512 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1513 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1514 return frm; 1515#undef ADDSHORT 1516} 1517 1518static __inline uint8_t * 1519add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1520{ 1521 memcpy(frm, ie->ie_data, ie->ie_len); 1522 return frm + ie->ie_len; 1523} 1524 1525static __inline uint8_t * 1526add_ie(uint8_t *frm, const uint8_t *ie) 1527{ 1528 memcpy(frm, ie, 2 + ie[1]); 1529 return frm + 2 + ie[1]; 1530} 1531 1532#define WME_OUI_BYTES 0x00, 0x50, 0xf2 1533/* 1534 * Add a WME information element to a frame. 1535 */ 1536static uint8_t * 1537ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1538{ 1539 static const struct ieee80211_wme_info info = { 1540 .wme_id = IEEE80211_ELEMID_VENDOR, 1541 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1542 .wme_oui = { WME_OUI_BYTES }, 1543 .wme_type = WME_OUI_TYPE, 1544 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1545 .wme_version = WME_VERSION, 1546 .wme_info = 0, 1547 }; 1548 memcpy(frm, &info, sizeof(info)); 1549 return frm + sizeof(info); 1550} 1551 1552/* 1553 * Add a WME parameters element to a frame. 1554 */ 1555static uint8_t * 1556ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1557{ 1558#define SM(_v, _f) (((_v) << _f##_S) & _f) 1559#define ADDSHORT(frm, v) do { \ 1560 LE_WRITE_2(frm, v); \ 1561 frm += 2; \ 1562} while (0) 1563 /* NB: this works 'cuz a param has an info at the front */ 1564 static const struct ieee80211_wme_info param = { 1565 .wme_id = IEEE80211_ELEMID_VENDOR, 1566 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1567 .wme_oui = { WME_OUI_BYTES }, 1568 .wme_type = WME_OUI_TYPE, 1569 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1570 .wme_version = WME_VERSION, 1571 }; 1572 int i; 1573 1574 memcpy(frm, ¶m, sizeof(param)); 1575 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1576 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1577 *frm++ = 0; /* reserved field */ 1578 for (i = 0; i < WME_NUM_AC; i++) { 1579 const struct wmeParams *ac = 1580 &wme->wme_bssChanParams.cap_wmeParams[i]; 1581 *frm++ = SM(i, WME_PARAM_ACI) 1582 | SM(ac->wmep_acm, WME_PARAM_ACM) 1583 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1584 ; 1585 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1586 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1587 ; 1588 ADDSHORT(frm, ac->wmep_txopLimit); 1589 } 1590 return frm; 1591#undef SM 1592#undef ADDSHORT 1593} 1594#undef WME_OUI_BYTES 1595 1596/* 1597 * Add an 11h Power Constraint element to a frame. 1598 */ 1599static uint8_t * 1600ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1601{ 1602 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1603 /* XXX per-vap tx power limit? */ 1604 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1605 1606 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1607 frm[1] = 1; 1608 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1609 return frm + 3; 1610} 1611 1612/* 1613 * Add an 11h Power Capability element to a frame. 1614 */ 1615static uint8_t * 1616ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1617{ 1618 frm[0] = IEEE80211_ELEMID_PWRCAP; 1619 frm[1] = 2; 1620 frm[2] = c->ic_minpower; 1621 frm[3] = c->ic_maxpower; 1622 return frm + 4; 1623} 1624 1625/* 1626 * Add an 11h Supported Channels element to a frame. 1627 */ 1628static uint8_t * 1629ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1630{ 1631 static const int ielen = 26; 1632 1633 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1634 frm[1] = ielen; 1635 /* XXX not correct */ 1636 memcpy(frm+2, ic->ic_chan_avail, ielen); 1637 return frm + 2 + ielen; 1638} 1639 1640/* 1641 * Add an 11h Channel Switch Announcement element to a frame. 1642 * Note that we use the per-vap CSA count to adjust the global 1643 * counter so we can use this routine to form probe response 1644 * frames and get the current count. 1645 */ 1646static uint8_t * 1647ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1648{ 1649 struct ieee80211com *ic = vap->iv_ic; 1650 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1651 1652 csa->csa_ie = IEEE80211_ELEMID_CSA; 1653 csa->csa_len = 3; 1654 csa->csa_mode = 1; /* XXX force quiet on channel */ 1655 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1656 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1657 return frm + sizeof(*csa); 1658} 1659 1660/* 1661 * Add an 11h country information element to a frame. 1662 */ 1663static uint8_t * 1664ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1665{ 1666 1667 if (ic->ic_countryie == NULL || 1668 ic->ic_countryie_chan != ic->ic_bsschan) { 1669 /* 1670 * Handle lazy construction of ie. This is done on 1671 * first use and after a channel change that requires 1672 * re-calculation. 1673 */ 1674 if (ic->ic_countryie != NULL) 1675 free(ic->ic_countryie, M_80211_NODE_IE); 1676 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1677 if (ic->ic_countryie == NULL) 1678 return frm; 1679 ic->ic_countryie_chan = ic->ic_bsschan; 1680 } 1681 return add_appie(frm, ic->ic_countryie); 1682} 1683 1684/* 1685 * Send a probe request frame with the specified ssid 1686 * and any optional information element data. 1687 */ 1688int 1689ieee80211_send_probereq(struct ieee80211_node *ni, 1690 const uint8_t sa[IEEE80211_ADDR_LEN], 1691 const uint8_t da[IEEE80211_ADDR_LEN], 1692 const uint8_t bssid[IEEE80211_ADDR_LEN], 1693 const uint8_t *ssid, size_t ssidlen) 1694{ 1695 struct ieee80211vap *vap = ni->ni_vap; 1696 struct ieee80211com *ic = ni->ni_ic; 1697 const struct ieee80211_txparam *tp; 1698 struct ieee80211_bpf_params params; 1699 struct ieee80211_frame *wh; 1700 const struct ieee80211_rateset *rs; 1701 struct mbuf *m; 1702 uint8_t *frm; 1703 1704 if (vap->iv_state == IEEE80211_S_CAC) { 1705 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1706 "block %s frame in CAC state", "probe request"); 1707 vap->iv_stats.is_tx_badstate++; 1708 return EIO; /* XXX */ 1709 } 1710 1711 /* 1712 * Hold a reference on the node so it doesn't go away until after 1713 * the xmit is complete all the way in the driver. On error we 1714 * will remove our reference. 1715 */ 1716 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1717 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1718 __func__, __LINE__, 1719 ni, ether_sprintf(ni->ni_macaddr), 1720 ieee80211_node_refcnt(ni)+1); 1721 ieee80211_ref_node(ni); 1722 1723 /* 1724 * prreq frame format 1725 * [tlv] ssid 1726 * [tlv] supported rates 1727 * [tlv] RSN (optional) 1728 * [tlv] extended supported rates 1729 * [tlv] WPA (optional) 1730 * [tlv] user-specified ie's 1731 */ 1732 m = ieee80211_getmgtframe(&frm, 1733 ic->ic_headroom + sizeof(struct ieee80211_frame), 1734 2 + IEEE80211_NWID_LEN 1735 + 2 + IEEE80211_RATE_SIZE 1736 + sizeof(struct ieee80211_ie_wpa) 1737 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1738 + sizeof(struct ieee80211_ie_wpa) 1739 + (vap->iv_appie_probereq != NULL ? 1740 vap->iv_appie_probereq->ie_len : 0) 1741 ); 1742 if (m == NULL) { 1743 vap->iv_stats.is_tx_nobuf++; 1744 ieee80211_free_node(ni); 1745 return ENOMEM; 1746 } 1747 1748 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1749 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1750 frm = ieee80211_add_rates(frm, rs); 1751 if (vap->iv_flags & IEEE80211_F_WPA2) { 1752 if (vap->iv_rsn_ie != NULL) 1753 frm = add_ie(frm, vap->iv_rsn_ie); 1754 /* XXX else complain? */ 1755 } 1756 frm = ieee80211_add_xrates(frm, rs); 1757 if (vap->iv_flags & IEEE80211_F_WPA1) { 1758 if (vap->iv_wpa_ie != NULL) 1759 frm = add_ie(frm, vap->iv_wpa_ie); 1760 /* XXX else complain? */ 1761 } 1762 if (vap->iv_appie_probereq != NULL) 1763 frm = add_appie(frm, vap->iv_appie_probereq); 1764 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1765 1766 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1767 ("leading space %zd", M_LEADINGSPACE(m))); 1768 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1769 if (m == NULL) { 1770 /* NB: cannot happen */ 1771 ieee80211_free_node(ni); 1772 return ENOMEM; 1773 } 1774 1775 wh = mtod(m, struct ieee80211_frame *); 1776 ieee80211_send_setup(ni, m, 1777 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1778 IEEE80211_NONQOS_TID, sa, da, bssid); 1779 /* XXX power management? */ 1780 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1781 1782 M_WME_SETAC(m, WME_AC_BE); 1783 1784 IEEE80211_NODE_STAT(ni, tx_probereq); 1785 IEEE80211_NODE_STAT(ni, tx_mgmt); 1786 1787 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1788 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1789 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 1790 ssidlen, ssid); 1791 1792 memset(¶ms, 0, sizeof(params)); 1793 params.ibp_pri = M_WME_GETAC(m); 1794 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1795 params.ibp_rate0 = tp->mgmtrate; 1796 if (IEEE80211_IS_MULTICAST(da)) { 1797 params.ibp_flags |= IEEE80211_BPF_NOACK; 1798 params.ibp_try0 = 1; 1799 } else 1800 params.ibp_try0 = tp->maxretry; 1801 params.ibp_power = ni->ni_txpower; 1802 return ic->ic_raw_xmit(ni, m, ¶ms); 1803} 1804 1805/* 1806 * Calculate capability information for mgt frames. 1807 */ 1808uint16_t 1809ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1810{ 1811 struct ieee80211com *ic = vap->iv_ic; 1812 uint16_t capinfo; 1813 1814 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1815 1816 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1817 capinfo = IEEE80211_CAPINFO_ESS; 1818 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1819 capinfo = IEEE80211_CAPINFO_IBSS; 1820 else 1821 capinfo = 0; 1822 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1823 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1824 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1825 IEEE80211_IS_CHAN_2GHZ(chan)) 1826 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1827 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1828 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1829 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1830 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1831 return capinfo; 1832} 1833 1834/* 1835 * Send a management frame. The node is for the destination (or ic_bss 1836 * when in station mode). Nodes other than ic_bss have their reference 1837 * count bumped to reflect our use for an indeterminant time. 1838 */ 1839int 1840ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1841{ 1842#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1843#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1844 struct ieee80211vap *vap = ni->ni_vap; 1845 struct ieee80211com *ic = ni->ni_ic; 1846 struct ieee80211_node *bss = vap->iv_bss; 1847 struct ieee80211_bpf_params params; 1848 struct mbuf *m; 1849 uint8_t *frm; 1850 uint16_t capinfo; 1851 int has_challenge, is_shared_key, ret, status; 1852 1853 KASSERT(ni != NULL, ("null node")); 1854 1855 /* 1856 * Hold a reference on the node so it doesn't go away until after 1857 * the xmit is complete all the way in the driver. On error we 1858 * will remove our reference. 1859 */ 1860 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1861 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1862 __func__, __LINE__, 1863 ni, ether_sprintf(ni->ni_macaddr), 1864 ieee80211_node_refcnt(ni)+1); 1865 ieee80211_ref_node(ni); 1866 1867 memset(¶ms, 0, sizeof(params)); 1868 switch (type) { 1869 1870 case IEEE80211_FC0_SUBTYPE_AUTH: 1871 status = arg >> 16; 1872 arg &= 0xffff; 1873 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1874 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1875 ni->ni_challenge != NULL); 1876 1877 /* 1878 * Deduce whether we're doing open authentication or 1879 * shared key authentication. We do the latter if 1880 * we're in the middle of a shared key authentication 1881 * handshake or if we're initiating an authentication 1882 * request and configured to use shared key. 1883 */ 1884 is_shared_key = has_challenge || 1885 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1886 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1887 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1888 1889 m = ieee80211_getmgtframe(&frm, 1890 ic->ic_headroom + sizeof(struct ieee80211_frame), 1891 3 * sizeof(uint16_t) 1892 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1893 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1894 ); 1895 if (m == NULL) 1896 senderr(ENOMEM, is_tx_nobuf); 1897 1898 ((uint16_t *)frm)[0] = 1899 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1900 : htole16(IEEE80211_AUTH_ALG_OPEN); 1901 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1902 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1903 1904 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1905 ((uint16_t *)frm)[3] = 1906 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1907 IEEE80211_ELEMID_CHALLENGE); 1908 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1909 IEEE80211_CHALLENGE_LEN); 1910 m->m_pkthdr.len = m->m_len = 1911 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1912 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1913 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1914 "request encrypt frame (%s)", __func__); 1915 /* mark frame for encryption */ 1916 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1917 } 1918 } else 1919 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1920 1921 /* XXX not right for shared key */ 1922 if (status == IEEE80211_STATUS_SUCCESS) 1923 IEEE80211_NODE_STAT(ni, tx_auth); 1924 else 1925 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1926 1927 if (vap->iv_opmode == IEEE80211_M_STA) 1928 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1929 (void *) vap->iv_state); 1930 break; 1931 1932 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1933 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1934 "send station deauthenticate (reason %d)", arg); 1935 m = ieee80211_getmgtframe(&frm, 1936 ic->ic_headroom + sizeof(struct ieee80211_frame), 1937 sizeof(uint16_t)); 1938 if (m == NULL) 1939 senderr(ENOMEM, is_tx_nobuf); 1940 *(uint16_t *)frm = htole16(arg); /* reason */ 1941 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1942 1943 IEEE80211_NODE_STAT(ni, tx_deauth); 1944 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1945 1946 ieee80211_node_unauthorize(ni); /* port closed */ 1947 break; 1948 1949 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1950 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1951 /* 1952 * asreq frame format 1953 * [2] capability information 1954 * [2] listen interval 1955 * [6*] current AP address (reassoc only) 1956 * [tlv] ssid 1957 * [tlv] supported rates 1958 * [tlv] extended supported rates 1959 * [4] power capability (optional) 1960 * [28] supported channels (optional) 1961 * [tlv] HT capabilities 1962 * [tlv] WME (optional) 1963 * [tlv] Vendor OUI HT capabilities (optional) 1964 * [tlv] Atheros capabilities (if negotiated) 1965 * [tlv] AppIE's (optional) 1966 */ 1967 m = ieee80211_getmgtframe(&frm, 1968 ic->ic_headroom + sizeof(struct ieee80211_frame), 1969 sizeof(uint16_t) 1970 + sizeof(uint16_t) 1971 + IEEE80211_ADDR_LEN 1972 + 2 + IEEE80211_NWID_LEN 1973 + 2 + IEEE80211_RATE_SIZE 1974 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1975 + 4 1976 + 2 + 26 1977 + sizeof(struct ieee80211_wme_info) 1978 + sizeof(struct ieee80211_ie_htcap) 1979 + 4 + sizeof(struct ieee80211_ie_htcap) 1980#ifdef IEEE80211_SUPPORT_SUPERG 1981 + sizeof(struct ieee80211_ath_ie) 1982#endif 1983 + (vap->iv_appie_wpa != NULL ? 1984 vap->iv_appie_wpa->ie_len : 0) 1985 + (vap->iv_appie_assocreq != NULL ? 1986 vap->iv_appie_assocreq->ie_len : 0) 1987 ); 1988 if (m == NULL) 1989 senderr(ENOMEM, is_tx_nobuf); 1990 1991 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 1992 ("wrong mode %u", vap->iv_opmode)); 1993 capinfo = IEEE80211_CAPINFO_ESS; 1994 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1995 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1996 /* 1997 * NB: Some 11a AP's reject the request when 1998 * short premable is set. 1999 */ 2000 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2001 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2002 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2003 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2004 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2005 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2006 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2007 (vap->iv_flags & IEEE80211_F_DOTH)) 2008 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2009 *(uint16_t *)frm = htole16(capinfo); 2010 frm += 2; 2011 2012 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2013 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2014 bss->ni_intval)); 2015 frm += 2; 2016 2017 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2018 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2019 frm += IEEE80211_ADDR_LEN; 2020 } 2021 2022 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2023 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2024 if (vap->iv_flags & IEEE80211_F_WPA2) { 2025 if (vap->iv_rsn_ie != NULL) 2026 frm = add_ie(frm, vap->iv_rsn_ie); 2027 /* XXX else complain? */ 2028 } 2029 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2030 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2031 frm = ieee80211_add_powercapability(frm, 2032 ic->ic_curchan); 2033 frm = ieee80211_add_supportedchannels(frm, ic); 2034 } 2035 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2036 ni->ni_ies.htcap_ie != NULL && 2037 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2038 frm = ieee80211_add_htcap(frm, ni); 2039 if (vap->iv_flags & IEEE80211_F_WPA1) { 2040 if (vap->iv_wpa_ie != NULL) 2041 frm = add_ie(frm, vap->iv_wpa_ie); 2042 /* XXX else complain */ 2043 } 2044 if ((ic->ic_flags & IEEE80211_F_WME) && 2045 ni->ni_ies.wme_ie != NULL) 2046 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2047 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2048 ni->ni_ies.htcap_ie != NULL && 2049 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2050 frm = ieee80211_add_htcap_vendor(frm, ni); 2051#ifdef IEEE80211_SUPPORT_SUPERG 2052 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2053 frm = ieee80211_add_ath(frm, 2054 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2055 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2056 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2057 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2058 } 2059#endif /* IEEE80211_SUPPORT_SUPERG */ 2060 if (vap->iv_appie_assocreq != NULL) 2061 frm = add_appie(frm, vap->iv_appie_assocreq); 2062 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2063 2064 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2065 (void *) vap->iv_state); 2066 break; 2067 2068 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2069 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2070 /* 2071 * asresp frame format 2072 * [2] capability information 2073 * [2] status 2074 * [2] association ID 2075 * [tlv] supported rates 2076 * [tlv] extended supported rates 2077 * [tlv] HT capabilities (standard, if STA enabled) 2078 * [tlv] HT information (standard, if STA enabled) 2079 * [tlv] WME (if configured and STA enabled) 2080 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2081 * [tlv] HT information (vendor OUI, if STA enabled) 2082 * [tlv] Atheros capabilities (if STA enabled) 2083 * [tlv] AppIE's (optional) 2084 */ 2085 m = ieee80211_getmgtframe(&frm, 2086 ic->ic_headroom + sizeof(struct ieee80211_frame), 2087 sizeof(uint16_t) 2088 + sizeof(uint16_t) 2089 + sizeof(uint16_t) 2090 + 2 + IEEE80211_RATE_SIZE 2091 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2092 + sizeof(struct ieee80211_ie_htcap) + 4 2093 + sizeof(struct ieee80211_ie_htinfo) + 4 2094 + sizeof(struct ieee80211_wme_param) 2095#ifdef IEEE80211_SUPPORT_SUPERG 2096 + sizeof(struct ieee80211_ath_ie) 2097#endif 2098 + (vap->iv_appie_assocresp != NULL ? 2099 vap->iv_appie_assocresp->ie_len : 0) 2100 ); 2101 if (m == NULL) 2102 senderr(ENOMEM, is_tx_nobuf); 2103 2104 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2105 *(uint16_t *)frm = htole16(capinfo); 2106 frm += 2; 2107 2108 *(uint16_t *)frm = htole16(arg); /* status */ 2109 frm += 2; 2110 2111 if (arg == IEEE80211_STATUS_SUCCESS) { 2112 *(uint16_t *)frm = htole16(ni->ni_associd); 2113 IEEE80211_NODE_STAT(ni, tx_assoc); 2114 } else 2115 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2116 frm += 2; 2117 2118 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2119 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2120 /* NB: respond according to what we received */ 2121 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2122 frm = ieee80211_add_htcap(frm, ni); 2123 frm = ieee80211_add_htinfo(frm, ni); 2124 } 2125 if ((vap->iv_flags & IEEE80211_F_WME) && 2126 ni->ni_ies.wme_ie != NULL) 2127 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2128 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2129 frm = ieee80211_add_htcap_vendor(frm, ni); 2130 frm = ieee80211_add_htinfo_vendor(frm, ni); 2131 } 2132#ifdef IEEE80211_SUPPORT_SUPERG 2133 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2134 frm = ieee80211_add_ath(frm, 2135 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2136 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2137 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2138 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2139#endif /* IEEE80211_SUPPORT_SUPERG */ 2140 if (vap->iv_appie_assocresp != NULL) 2141 frm = add_appie(frm, vap->iv_appie_assocresp); 2142 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2143 break; 2144 2145 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2146 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2147 "send station disassociate (reason %d)", arg); 2148 m = ieee80211_getmgtframe(&frm, 2149 ic->ic_headroom + sizeof(struct ieee80211_frame), 2150 sizeof(uint16_t)); 2151 if (m == NULL) 2152 senderr(ENOMEM, is_tx_nobuf); 2153 *(uint16_t *)frm = htole16(arg); /* reason */ 2154 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2155 2156 IEEE80211_NODE_STAT(ni, tx_disassoc); 2157 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2158 break; 2159 2160 default: 2161 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2162 "invalid mgmt frame type %u", type); 2163 senderr(EINVAL, is_tx_unknownmgt); 2164 /* NOTREACHED */ 2165 } 2166 2167 /* NB: force non-ProbeResp frames to the highest queue */ 2168 params.ibp_pri = WME_AC_VO; 2169 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2170 /* NB: we know all frames are unicast */ 2171 params.ibp_try0 = bss->ni_txparms->maxretry; 2172 params.ibp_power = bss->ni_txpower; 2173 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2174bad: 2175 ieee80211_free_node(ni); 2176 return ret; 2177#undef senderr 2178#undef HTFLAGS 2179} 2180 2181/* 2182 * Return an mbuf with a probe response frame in it. 2183 * Space is left to prepend and 802.11 header at the 2184 * front but it's left to the caller to fill in. 2185 */ 2186struct mbuf * 2187ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2188{ 2189 struct ieee80211vap *vap = bss->ni_vap; 2190 struct ieee80211com *ic = bss->ni_ic; 2191 const struct ieee80211_rateset *rs; 2192 struct mbuf *m; 2193 uint16_t capinfo; 2194 uint8_t *frm; 2195 2196 /* 2197 * probe response frame format 2198 * [8] time stamp 2199 * [2] beacon interval 2200 * [2] cabability information 2201 * [tlv] ssid 2202 * [tlv] supported rates 2203 * [tlv] parameter set (FH/DS) 2204 * [tlv] parameter set (IBSS) 2205 * [tlv] country (optional) 2206 * [3] power control (optional) 2207 * [5] channel switch announcement (CSA) (optional) 2208 * [tlv] extended rate phy (ERP) 2209 * [tlv] extended supported rates 2210 * [tlv] RSN (optional) 2211 * [tlv] HT capabilities 2212 * [tlv] HT information 2213 * [tlv] WPA (optional) 2214 * [tlv] WME (optional) 2215 * [tlv] Vendor OUI HT capabilities (optional) 2216 * [tlv] Vendor OUI HT information (optional) 2217 * [tlv] Atheros capabilities 2218 * [tlv] AppIE's (optional) 2219 * [tlv] Mesh ID (MBSS) 2220 * [tlv] Mesh Conf (MBSS) 2221 */ 2222 m = ieee80211_getmgtframe(&frm, 2223 ic->ic_headroom + sizeof(struct ieee80211_frame), 2224 8 2225 + sizeof(uint16_t) 2226 + sizeof(uint16_t) 2227 + 2 + IEEE80211_NWID_LEN 2228 + 2 + IEEE80211_RATE_SIZE 2229 + 7 /* max(7,3) */ 2230 + IEEE80211_COUNTRY_MAX_SIZE 2231 + 3 2232 + sizeof(struct ieee80211_csa_ie) 2233 + 3 2234 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2235 + sizeof(struct ieee80211_ie_wpa) 2236 + sizeof(struct ieee80211_ie_htcap) 2237 + sizeof(struct ieee80211_ie_htinfo) 2238 + sizeof(struct ieee80211_ie_wpa) 2239 + sizeof(struct ieee80211_wme_param) 2240 + 4 + sizeof(struct ieee80211_ie_htcap) 2241 + 4 + sizeof(struct ieee80211_ie_htinfo) 2242#ifdef IEEE80211_SUPPORT_SUPERG 2243 + sizeof(struct ieee80211_ath_ie) 2244#endif 2245#ifdef IEEE80211_SUPPORT_MESH 2246 + 2 + IEEE80211_MESHID_LEN 2247 + sizeof(struct ieee80211_meshconf_ie) 2248#endif 2249 + (vap->iv_appie_proberesp != NULL ? 2250 vap->iv_appie_proberesp->ie_len : 0) 2251 ); 2252 if (m == NULL) { 2253 vap->iv_stats.is_tx_nobuf++; 2254 return NULL; 2255 } 2256 2257 memset(frm, 0, 8); /* timestamp should be filled later */ 2258 frm += 8; 2259 *(uint16_t *)frm = htole16(bss->ni_intval); 2260 frm += 2; 2261 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2262 *(uint16_t *)frm = htole16(capinfo); 2263 frm += 2; 2264 2265 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2266 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2267 frm = ieee80211_add_rates(frm, rs); 2268 2269 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2270 *frm++ = IEEE80211_ELEMID_FHPARMS; 2271 *frm++ = 5; 2272 *frm++ = bss->ni_fhdwell & 0x00ff; 2273 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2274 *frm++ = IEEE80211_FH_CHANSET( 2275 ieee80211_chan2ieee(ic, bss->ni_chan)); 2276 *frm++ = IEEE80211_FH_CHANPAT( 2277 ieee80211_chan2ieee(ic, bss->ni_chan)); 2278 *frm++ = bss->ni_fhindex; 2279 } else { 2280 *frm++ = IEEE80211_ELEMID_DSPARMS; 2281 *frm++ = 1; 2282 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2283 } 2284 2285 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2286 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2287 *frm++ = 2; 2288 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2289 } 2290 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2291 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2292 frm = ieee80211_add_countryie(frm, ic); 2293 if (vap->iv_flags & IEEE80211_F_DOTH) { 2294 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2295 frm = ieee80211_add_powerconstraint(frm, vap); 2296 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2297 frm = ieee80211_add_csa(frm, vap); 2298 } 2299 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2300 frm = ieee80211_add_erp(frm, ic); 2301 frm = ieee80211_add_xrates(frm, rs); 2302 if (vap->iv_flags & IEEE80211_F_WPA2) { 2303 if (vap->iv_rsn_ie != NULL) 2304 frm = add_ie(frm, vap->iv_rsn_ie); 2305 /* XXX else complain? */ 2306 } 2307 /* 2308 * NB: legacy 11b clients do not get certain ie's. 2309 * The caller identifies such clients by passing 2310 * a token in legacy to us. Could expand this to be 2311 * any legacy client for stuff like HT ie's. 2312 */ 2313 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2314 legacy != IEEE80211_SEND_LEGACY_11B) { 2315 frm = ieee80211_add_htcap(frm, bss); 2316 frm = ieee80211_add_htinfo(frm, bss); 2317 } 2318 if (vap->iv_flags & IEEE80211_F_WPA1) { 2319 if (vap->iv_wpa_ie != NULL) 2320 frm = add_ie(frm, vap->iv_wpa_ie); 2321 /* XXX else complain? */ 2322 } 2323 if (vap->iv_flags & IEEE80211_F_WME) 2324 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2325 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2326 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2327 legacy != IEEE80211_SEND_LEGACY_11B) { 2328 frm = ieee80211_add_htcap_vendor(frm, bss); 2329 frm = ieee80211_add_htinfo_vendor(frm, bss); 2330 } 2331#ifdef IEEE80211_SUPPORT_SUPERG 2332 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2333 legacy != IEEE80211_SEND_LEGACY_11B) 2334 frm = ieee80211_add_athcaps(frm, bss); 2335#endif 2336 if (vap->iv_appie_proberesp != NULL) 2337 frm = add_appie(frm, vap->iv_appie_proberesp); 2338#ifdef IEEE80211_SUPPORT_MESH 2339 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2340 frm = ieee80211_add_meshid(frm, vap); 2341 frm = ieee80211_add_meshconf(frm, vap); 2342 } 2343#endif 2344 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2345 2346 return m; 2347} 2348 2349/* 2350 * Send a probe response frame to the specified mac address. 2351 * This does not go through the normal mgt frame api so we 2352 * can specify the destination address and re-use the bss node 2353 * for the sta reference. 2354 */ 2355int 2356ieee80211_send_proberesp(struct ieee80211vap *vap, 2357 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2358{ 2359 struct ieee80211_node *bss = vap->iv_bss; 2360 struct ieee80211com *ic = vap->iv_ic; 2361 struct ieee80211_frame *wh; 2362 struct mbuf *m; 2363 2364 if (vap->iv_state == IEEE80211_S_CAC) { 2365 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2366 "block %s frame in CAC state", "probe response"); 2367 vap->iv_stats.is_tx_badstate++; 2368 return EIO; /* XXX */ 2369 } 2370 2371 /* 2372 * Hold a reference on the node so it doesn't go away until after 2373 * the xmit is complete all the way in the driver. On error we 2374 * will remove our reference. 2375 */ 2376 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2377 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2378 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2379 ieee80211_node_refcnt(bss)+1); 2380 ieee80211_ref_node(bss); 2381 2382 m = ieee80211_alloc_proberesp(bss, legacy); 2383 if (m == NULL) { 2384 ieee80211_free_node(bss); 2385 return ENOMEM; 2386 } 2387 2388 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2389 KASSERT(m != NULL, ("no room for header")); 2390 2391 wh = mtod(m, struct ieee80211_frame *); 2392 ieee80211_send_setup(bss, m, 2393 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2394 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2395 /* XXX power management? */ 2396 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2397 2398 M_WME_SETAC(m, WME_AC_BE); 2399 2400 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2401 "send probe resp on channel %u to %s%s\n", 2402 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2403 legacy ? " <legacy>" : ""); 2404 IEEE80211_NODE_STAT(bss, tx_mgmt); 2405 2406 return ic->ic_raw_xmit(bss, m, NULL); 2407} 2408 2409/* 2410 * Allocate and build a RTS (Request To Send) control frame. 2411 */ 2412struct mbuf * 2413ieee80211_alloc_rts(struct ieee80211com *ic, 2414 const uint8_t ra[IEEE80211_ADDR_LEN], 2415 const uint8_t ta[IEEE80211_ADDR_LEN], 2416 uint16_t dur) 2417{ 2418 struct ieee80211_frame_rts *rts; 2419 struct mbuf *m; 2420 2421 /* XXX honor ic_headroom */ 2422 m = m_gethdr(M_DONTWAIT, MT_DATA); 2423 if (m != NULL) { 2424 rts = mtod(m, struct ieee80211_frame_rts *); 2425 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2426 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2427 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2428 *(u_int16_t *)rts->i_dur = htole16(dur); 2429 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2430 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2431 2432 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2433 } 2434 return m; 2435} 2436 2437/* 2438 * Allocate and build a CTS (Clear To Send) control frame. 2439 */ 2440struct mbuf * 2441ieee80211_alloc_cts(struct ieee80211com *ic, 2442 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2443{ 2444 struct ieee80211_frame_cts *cts; 2445 struct mbuf *m; 2446 2447 /* XXX honor ic_headroom */ 2448 m = m_gethdr(M_DONTWAIT, MT_DATA); 2449 if (m != NULL) { 2450 cts = mtod(m, struct ieee80211_frame_cts *); 2451 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2452 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2453 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2454 *(u_int16_t *)cts->i_dur = htole16(dur); 2455 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2456 2457 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2458 } 2459 return m; 2460} 2461 2462static void 2463ieee80211_tx_mgt_timeout(void *arg) 2464{ 2465 struct ieee80211_node *ni = arg; 2466 struct ieee80211vap *vap = ni->ni_vap; 2467 2468 if (vap->iv_state != IEEE80211_S_INIT && 2469 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2470 /* 2471 * NB: it's safe to specify a timeout as the reason here; 2472 * it'll only be used in the right state. 2473 */ 2474 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2475 IEEE80211_SCAN_FAIL_TIMEOUT); 2476 } 2477} 2478 2479static void 2480ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2481{ 2482 struct ieee80211vap *vap = ni->ni_vap; 2483 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2484 2485 /* 2486 * Frame transmit completed; arrange timer callback. If 2487 * transmit was successfuly we wait for response. Otherwise 2488 * we arrange an immediate callback instead of doing the 2489 * callback directly since we don't know what state the driver 2490 * is in (e.g. what locks it is holding). This work should 2491 * not be too time-critical and not happen too often so the 2492 * added overhead is acceptable. 2493 * 2494 * XXX what happens if !acked but response shows up before callback? 2495 */ 2496 if (vap->iv_state == ostate) 2497 callout_reset(&vap->iv_mgtsend, 2498 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2499 ieee80211_tx_mgt_timeout, ni); 2500} 2501 2502static void 2503ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2504 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2505{ 2506 struct ieee80211vap *vap = ni->ni_vap; 2507 struct ieee80211com *ic = ni->ni_ic; 2508 struct ieee80211_rateset *rs = &ni->ni_rates; 2509 uint16_t capinfo; 2510 2511 /* 2512 * beacon frame format 2513 * [8] time stamp 2514 * [2] beacon interval 2515 * [2] cabability information 2516 * [tlv] ssid 2517 * [tlv] supported rates 2518 * [3] parameter set (DS) 2519 * [8] CF parameter set (optional) 2520 * [tlv] parameter set (IBSS/TIM) 2521 * [tlv] country (optional) 2522 * [3] power control (optional) 2523 * [5] channel switch announcement (CSA) (optional) 2524 * [tlv] extended rate phy (ERP) 2525 * [tlv] extended supported rates 2526 * [tlv] RSN parameters 2527 * [tlv] HT capabilities 2528 * [tlv] HT information 2529 * XXX Vendor-specific OIDs (e.g. Atheros) 2530 * [tlv] WPA parameters 2531 * [tlv] WME parameters 2532 * [tlv] Vendor OUI HT capabilities (optional) 2533 * [tlv] Vendor OUI HT information (optional) 2534 * [tlv] Atheros capabilities (optional) 2535 * [tlv] TDMA parameters (optional) 2536 * [tlv] Mesh ID (MBSS) 2537 * [tlv] Mesh Conf (MBSS) 2538 * [tlv] application data (optional) 2539 */ 2540 2541 memset(bo, 0, sizeof(*bo)); 2542 2543 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2544 frm += 8; 2545 *(uint16_t *)frm = htole16(ni->ni_intval); 2546 frm += 2; 2547 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2548 bo->bo_caps = (uint16_t *)frm; 2549 *(uint16_t *)frm = htole16(capinfo); 2550 frm += 2; 2551 *frm++ = IEEE80211_ELEMID_SSID; 2552 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2553 *frm++ = ni->ni_esslen; 2554 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2555 frm += ni->ni_esslen; 2556 } else 2557 *frm++ = 0; 2558 frm = ieee80211_add_rates(frm, rs); 2559 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2560 *frm++ = IEEE80211_ELEMID_DSPARMS; 2561 *frm++ = 1; 2562 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2563 } 2564 if (ic->ic_flags & IEEE80211_F_PCF) { 2565 bo->bo_cfp = frm; 2566 frm = ieee80211_add_cfparms(frm, ic); 2567 } 2568 bo->bo_tim = frm; 2569 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2570 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2571 *frm++ = 2; 2572 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2573 bo->bo_tim_len = 0; 2574 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2575 vap->iv_opmode == IEEE80211_M_MBSS) { 2576 /* TIM IE is the same for Mesh and Hostap */ 2577 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2578 2579 tie->tim_ie = IEEE80211_ELEMID_TIM; 2580 tie->tim_len = 4; /* length */ 2581 tie->tim_count = 0; /* DTIM count */ 2582 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2583 tie->tim_bitctl = 0; /* bitmap control */ 2584 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2585 frm += sizeof(struct ieee80211_tim_ie); 2586 bo->bo_tim_len = 1; 2587 } 2588 bo->bo_tim_trailer = frm; 2589 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2590 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2591 frm = ieee80211_add_countryie(frm, ic); 2592 if (vap->iv_flags & IEEE80211_F_DOTH) { 2593 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2594 frm = ieee80211_add_powerconstraint(frm, vap); 2595 bo->bo_csa = frm; 2596 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2597 frm = ieee80211_add_csa(frm, vap); 2598 } else 2599 bo->bo_csa = frm; 2600 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2601 bo->bo_erp = frm; 2602 frm = ieee80211_add_erp(frm, ic); 2603 } 2604 frm = ieee80211_add_xrates(frm, rs); 2605 if (vap->iv_flags & IEEE80211_F_WPA2) { 2606 if (vap->iv_rsn_ie != NULL) 2607 frm = add_ie(frm, vap->iv_rsn_ie); 2608 /* XXX else complain */ 2609 } 2610 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2611 frm = ieee80211_add_htcap(frm, ni); 2612 bo->bo_htinfo = frm; 2613 frm = ieee80211_add_htinfo(frm, ni); 2614 } 2615 if (vap->iv_flags & IEEE80211_F_WPA1) { 2616 if (vap->iv_wpa_ie != NULL) 2617 frm = add_ie(frm, vap->iv_wpa_ie); 2618 /* XXX else complain */ 2619 } 2620 if (vap->iv_flags & IEEE80211_F_WME) { 2621 bo->bo_wme = frm; 2622 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2623 } 2624 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2625 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2626 frm = ieee80211_add_htcap_vendor(frm, ni); 2627 frm = ieee80211_add_htinfo_vendor(frm, ni); 2628 } 2629#ifdef IEEE80211_SUPPORT_SUPERG 2630 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2631 bo->bo_ath = frm; 2632 frm = ieee80211_add_athcaps(frm, ni); 2633 } 2634#endif 2635#ifdef IEEE80211_SUPPORT_TDMA 2636 if (vap->iv_caps & IEEE80211_C_TDMA) { 2637 bo->bo_tdma = frm; 2638 frm = ieee80211_add_tdma(frm, vap); 2639 } 2640#endif 2641 if (vap->iv_appie_beacon != NULL) { 2642 bo->bo_appie = frm; 2643 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2644 frm = add_appie(frm, vap->iv_appie_beacon); 2645 } 2646#ifdef IEEE80211_SUPPORT_MESH 2647 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2648 frm = ieee80211_add_meshid(frm, vap); 2649 frm = ieee80211_add_meshconf(frm, vap); 2650 } 2651#endif 2652 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2653 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2654 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2655} 2656 2657/* 2658 * Allocate a beacon frame and fillin the appropriate bits. 2659 */ 2660struct mbuf * 2661ieee80211_beacon_alloc(struct ieee80211_node *ni, 2662 struct ieee80211_beacon_offsets *bo) 2663{ 2664 struct ieee80211vap *vap = ni->ni_vap; 2665 struct ieee80211com *ic = ni->ni_ic; 2666 struct ifnet *ifp = vap->iv_ifp; 2667 struct ieee80211_frame *wh; 2668 struct mbuf *m; 2669 int pktlen; 2670 uint8_t *frm; 2671 2672 /* 2673 * beacon frame format 2674 * [8] time stamp 2675 * [2] beacon interval 2676 * [2] cabability information 2677 * [tlv] ssid 2678 * [tlv] supported rates 2679 * [3] parameter set (DS) 2680 * [8] CF parameter set (optional) 2681 * [tlv] parameter set (IBSS/TIM) 2682 * [tlv] country (optional) 2683 * [3] power control (optional) 2684 * [5] channel switch announcement (CSA) (optional) 2685 * [tlv] extended rate phy (ERP) 2686 * [tlv] extended supported rates 2687 * [tlv] RSN parameters 2688 * [tlv] HT capabilities 2689 * [tlv] HT information 2690 * [tlv] Vendor OUI HT capabilities (optional) 2691 * [tlv] Vendor OUI HT information (optional) 2692 * XXX Vendor-specific OIDs (e.g. Atheros) 2693 * [tlv] WPA parameters 2694 * [tlv] WME parameters 2695 * [tlv] TDMA parameters (optional) 2696 * [tlv] Mesh ID (MBSS) 2697 * [tlv] Mesh Conf (MBSS) 2698 * [tlv] application data (optional) 2699 * NB: we allocate the max space required for the TIM bitmap. 2700 * XXX how big is this? 2701 */ 2702 pktlen = 8 /* time stamp */ 2703 + sizeof(uint16_t) /* beacon interval */ 2704 + sizeof(uint16_t) /* capabilities */ 2705 + 2 + ni->ni_esslen /* ssid */ 2706 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2707 + 2 + 1 /* DS parameters */ 2708 + 2 + 6 /* CF parameters */ 2709 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2710 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2711 + 2 + 1 /* power control */ 2712 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2713 + 2 + 1 /* ERP */ 2714 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2715 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2716 2*sizeof(struct ieee80211_ie_wpa) : 0) 2717 /* XXX conditional? */ 2718 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2719 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2720 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2721 sizeof(struct ieee80211_wme_param) : 0) 2722#ifdef IEEE80211_SUPPORT_SUPERG 2723 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2724#endif 2725#ifdef IEEE80211_SUPPORT_TDMA 2726 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2727 sizeof(struct ieee80211_tdma_param) : 0) 2728#endif 2729#ifdef IEEE80211_SUPPORT_MESH 2730 + 2 + ni->ni_meshidlen 2731 + sizeof(struct ieee80211_meshconf_ie) 2732#endif 2733 + IEEE80211_MAX_APPIE 2734 ; 2735 m = ieee80211_getmgtframe(&frm, 2736 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2737 if (m == NULL) { 2738 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2739 "%s: cannot get buf; size %u\n", __func__, pktlen); 2740 vap->iv_stats.is_tx_nobuf++; 2741 return NULL; 2742 } 2743 ieee80211_beacon_construct(m, frm, bo, ni); 2744 2745 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2746 KASSERT(m != NULL, ("no space for 802.11 header?")); 2747 wh = mtod(m, struct ieee80211_frame *); 2748 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2749 IEEE80211_FC0_SUBTYPE_BEACON; 2750 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2751 *(uint16_t *)wh->i_dur = 0; 2752 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2753 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2754#ifdef IEEE80211_SUPPORT_MESH 2755 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2756 static const uint8_t zerobssid[IEEE80211_ADDR_LEN]; 2757 IEEE80211_ADDR_COPY(wh->i_addr3, zerobssid); 2758 } else 2759#endif 2760 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2761 *(uint16_t *)wh->i_seq = 0; 2762 2763 return m; 2764} 2765 2766/* 2767 * Update the dynamic parts of a beacon frame based on the current state. 2768 */ 2769int 2770ieee80211_beacon_update(struct ieee80211_node *ni, 2771 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2772{ 2773 struct ieee80211vap *vap = ni->ni_vap; 2774 struct ieee80211com *ic = ni->ni_ic; 2775 int len_changed = 0; 2776 uint16_t capinfo; 2777 2778 IEEE80211_LOCK(ic); 2779 /* 2780 * Handle 11h channel change when we've reached the count. 2781 * We must recalculate the beacon frame contents to account 2782 * for the new channel. Note we do this only for the first 2783 * vap that reaches this point; subsequent vaps just update 2784 * their beacon state to reflect the recalculated channel. 2785 */ 2786 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2787 vap->iv_csa_count == ic->ic_csa_count) { 2788 vap->iv_csa_count = 0; 2789 /* 2790 * Effect channel change before reconstructing the beacon 2791 * frame contents as many places reference ni_chan. 2792 */ 2793 if (ic->ic_csa_newchan != NULL) 2794 ieee80211_csa_completeswitch(ic); 2795 /* 2796 * NB: ieee80211_beacon_construct clears all pending 2797 * updates in bo_flags so we don't need to explicitly 2798 * clear IEEE80211_BEACON_CSA. 2799 */ 2800 ieee80211_beacon_construct(m, 2801 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2802 2803 /* XXX do WME aggressive mode processing? */ 2804 IEEE80211_UNLOCK(ic); 2805 return 1; /* just assume length changed */ 2806 } 2807 2808 /* XXX faster to recalculate entirely or just changes? */ 2809 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2810 *bo->bo_caps = htole16(capinfo); 2811 2812 if (vap->iv_flags & IEEE80211_F_WME) { 2813 struct ieee80211_wme_state *wme = &ic->ic_wme; 2814 2815 /* 2816 * Check for agressive mode change. When there is 2817 * significant high priority traffic in the BSS 2818 * throttle back BE traffic by using conservative 2819 * parameters. Otherwise BE uses agressive params 2820 * to optimize performance of legacy/non-QoS traffic. 2821 */ 2822 if (wme->wme_flags & WME_F_AGGRMODE) { 2823 if (wme->wme_hipri_traffic > 2824 wme->wme_hipri_switch_thresh) { 2825 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2826 "%s: traffic %u, disable aggressive mode\n", 2827 __func__, wme->wme_hipri_traffic); 2828 wme->wme_flags &= ~WME_F_AGGRMODE; 2829 ieee80211_wme_updateparams_locked(vap); 2830 wme->wme_hipri_traffic = 2831 wme->wme_hipri_switch_hysteresis; 2832 } else 2833 wme->wme_hipri_traffic = 0; 2834 } else { 2835 if (wme->wme_hipri_traffic <= 2836 wme->wme_hipri_switch_thresh) { 2837 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2838 "%s: traffic %u, enable aggressive mode\n", 2839 __func__, wme->wme_hipri_traffic); 2840 wme->wme_flags |= WME_F_AGGRMODE; 2841 ieee80211_wme_updateparams_locked(vap); 2842 wme->wme_hipri_traffic = 0; 2843 } else 2844 wme->wme_hipri_traffic = 2845 wme->wme_hipri_switch_hysteresis; 2846 } 2847 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2848 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2849 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2850 } 2851 } 2852 2853 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2854 ieee80211_ht_update_beacon(vap, bo); 2855 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2856 } 2857#ifdef IEEE80211_SUPPORT_TDMA 2858 if (vap->iv_caps & IEEE80211_C_TDMA) { 2859 /* 2860 * NB: the beacon is potentially updated every TBTT. 2861 */ 2862 ieee80211_tdma_update_beacon(vap, bo); 2863 } 2864#endif 2865 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2866 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2867 struct ieee80211_tim_ie *tie = 2868 (struct ieee80211_tim_ie *) bo->bo_tim; 2869 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2870 u_int timlen, timoff, i; 2871 /* 2872 * ATIM/DTIM needs updating. If it fits in the 2873 * current space allocated then just copy in the 2874 * new bits. Otherwise we need to move any trailing 2875 * data to make room. Note that we know there is 2876 * contiguous space because ieee80211_beacon_allocate 2877 * insures there is space in the mbuf to write a 2878 * maximal-size virtual bitmap (based on iv_max_aid). 2879 */ 2880 /* 2881 * Calculate the bitmap size and offset, copy any 2882 * trailer out of the way, and then copy in the 2883 * new bitmap and update the information element. 2884 * Note that the tim bitmap must contain at least 2885 * one byte and any offset must be even. 2886 */ 2887 if (vap->iv_ps_pending != 0) { 2888 timoff = 128; /* impossibly large */ 2889 for (i = 0; i < vap->iv_tim_len; i++) 2890 if (vap->iv_tim_bitmap[i]) { 2891 timoff = i &~ 1; 2892 break; 2893 } 2894 KASSERT(timoff != 128, ("tim bitmap empty!")); 2895 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2896 if (vap->iv_tim_bitmap[i]) 2897 break; 2898 timlen = 1 + (i - timoff); 2899 } else { 2900 timoff = 0; 2901 timlen = 1; 2902 } 2903 if (timlen != bo->bo_tim_len) { 2904 /* copy up/down trailer */ 2905 int adjust = tie->tim_bitmap+timlen 2906 - bo->bo_tim_trailer; 2907 ovbcopy(bo->bo_tim_trailer, 2908 bo->bo_tim_trailer+adjust, 2909 bo->bo_tim_trailer_len); 2910 bo->bo_tim_trailer += adjust; 2911 bo->bo_erp += adjust; 2912 bo->bo_htinfo += adjust; 2913#ifdef IEEE80211_SUPERG_SUPPORT 2914 bo->bo_ath += adjust; 2915#endif 2916#ifdef IEEE80211_TDMA_SUPPORT 2917 bo->bo_tdma += adjust; 2918#endif 2919 bo->bo_appie += adjust; 2920 bo->bo_wme += adjust; 2921 bo->bo_csa += adjust; 2922 bo->bo_tim_len = timlen; 2923 2924 /* update information element */ 2925 tie->tim_len = 3 + timlen; 2926 tie->tim_bitctl = timoff; 2927 len_changed = 1; 2928 } 2929 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2930 bo->bo_tim_len); 2931 2932 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2933 2934 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2935 "%s: TIM updated, pending %u, off %u, len %u\n", 2936 __func__, vap->iv_ps_pending, timoff, timlen); 2937 } 2938 /* count down DTIM period */ 2939 if (tie->tim_count == 0) 2940 tie->tim_count = tie->tim_period - 1; 2941 else 2942 tie->tim_count--; 2943 /* update state for buffered multicast frames on DTIM */ 2944 if (mcast && tie->tim_count == 0) 2945 tie->tim_bitctl |= 1; 2946 else 2947 tie->tim_bitctl &= ~1; 2948 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2949 struct ieee80211_csa_ie *csa = 2950 (struct ieee80211_csa_ie *) bo->bo_csa; 2951 2952 /* 2953 * Insert or update CSA ie. If we're just starting 2954 * to count down to the channel switch then we need 2955 * to insert the CSA ie. Otherwise we just need to 2956 * drop the count. The actual change happens above 2957 * when the vap's count reaches the target count. 2958 */ 2959 if (vap->iv_csa_count == 0) { 2960 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2961 bo->bo_erp += sizeof(*csa); 2962 bo->bo_htinfo += sizeof(*csa); 2963 bo->bo_wme += sizeof(*csa); 2964#ifdef IEEE80211_SUPERG_SUPPORT 2965 bo->bo_ath += sizeof(*csa); 2966#endif 2967#ifdef IEEE80211_TDMA_SUPPORT 2968 bo->bo_tdma += sizeof(*csa); 2969#endif 2970 bo->bo_appie += sizeof(*csa); 2971 bo->bo_csa_trailer_len += sizeof(*csa); 2972 bo->bo_tim_trailer_len += sizeof(*csa); 2973 m->m_len += sizeof(*csa); 2974 m->m_pkthdr.len += sizeof(*csa); 2975 2976 ieee80211_add_csa(bo->bo_csa, vap); 2977 } else 2978 csa->csa_count--; 2979 vap->iv_csa_count++; 2980 /* NB: don't clear IEEE80211_BEACON_CSA */ 2981 } 2982 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2983 /* 2984 * ERP element needs updating. 2985 */ 2986 (void) ieee80211_add_erp(bo->bo_erp, ic); 2987 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2988 } 2989#ifdef IEEE80211_SUPPORT_SUPERG 2990 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 2991 ieee80211_add_athcaps(bo->bo_ath, ni); 2992 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 2993 } 2994#endif 2995 } 2996 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 2997 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 2998 int aielen; 2999 uint8_t *frm; 3000 3001 aielen = 0; 3002 if (aie != NULL) 3003 aielen += aie->ie_len; 3004 if (aielen != bo->bo_appie_len) { 3005 /* copy up/down trailer */ 3006 int adjust = aielen - bo->bo_appie_len; 3007 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3008 bo->bo_tim_trailer_len); 3009 bo->bo_tim_trailer += adjust; 3010 bo->bo_appie += adjust; 3011 bo->bo_appie_len = aielen; 3012 3013 len_changed = 1; 3014 } 3015 frm = bo->bo_appie; 3016 if (aie != NULL) 3017 frm = add_appie(frm, aie); 3018 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3019 } 3020 IEEE80211_UNLOCK(ic); 3021 3022 return len_changed; 3023} 3024