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("$FreeBSD$"); 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/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/endian.h> 40 41 #include <sys/socket.h> 42 43 #include <net/bpf.h> 44 #include <net/ethernet.h> 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/if_llc.h> 48 #include <net/if_media.h> 49 #include <net/if_vlan_var.h> 50 51 #include <net80211/ieee80211_var.h> 52 #include <net80211/ieee80211_regdomain.h> 53 #ifdef IEEE80211_SUPPORT_SUPERG 54 #include <net80211/ieee80211_superg.h> 55 #endif 56 #ifdef IEEE80211_SUPPORT_TDMA 57 #include <net80211/ieee80211_tdma.h> 58 #endif 59 #include <net80211/ieee80211_wds.h> 60 #include <net80211/ieee80211_mesh.h> 61 62 #if defined(INET) || defined(INET6) 63 #include <netinet/in.h> 64 #endif 65 66 #ifdef INET 67 #include <netinet/if_ether.h> 68 #include <netinet/in_systm.h> 69 #include <netinet/ip.h> 70 #endif 71 #ifdef INET6 72 #include <netinet/ip6.h> 73 #endif 74 75 #include <security/mac/mac_framework.h> 76 77 #define ETHER_HEADER_COPY(dst, src) \ 78 memcpy(dst, src, sizeof(struct ether_header)) 79 80 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 81 u_int hdrsize, u_int ciphdrsize, u_int mtu); 82 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 83 84 #ifdef IEEE80211_DEBUG 85 /* 86 * Decide if an outbound management frame should be 87 * printed when debugging is enabled. This filters some 88 * of the less interesting frames that come frequently 89 * (e.g. beacons). 90 */ 91 static __inline int 92 doprint(struct ieee80211vap *vap, int subtype) 93 { 94 switch (subtype) { 95 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 96 return (vap->iv_opmode == IEEE80211_M_IBSS); 97 } 98 return 1; 99 } 100 #endif 101 102 /* 103 * Transmit a frame to the given destination on the given VAP. 104 * 105 * It's up to the caller to figure out the details of who this 106 * is going to and resolving the node. 107 * 108 * This routine takes care of queuing it for power save, 109 * A-MPDU state stuff, fast-frames state stuff, encapsulation 110 * if required, then passing it up to the driver layer. 111 * 112 * This routine (for now) consumes the mbuf and frees the node 113 * reference; it ideally will return a TX status which reflects 114 * whether the mbuf was consumed or not, so the caller can 115 * free the mbuf (if appropriate) and the node reference (again, 116 * if appropriate.) 117 */ 118 int 119 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m, 120 struct ieee80211_node *ni) 121 { 122 struct ieee80211com *ic = vap->iv_ic; 123 struct ifnet *ifp = vap->iv_ifp; 124 125 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 126 (m->m_flags & M_PWR_SAV) == 0) { 127 /* 128 * Station in power save mode; pass the frame 129 * to the 802.11 layer and continue. We'll get 130 * the frame back when the time is right. 131 * XXX lose WDS vap linkage? 132 */ 133 if (ieee80211_pwrsave(ni, m) != 0) 134 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 135 ieee80211_free_node(ni); 136 137 /* 138 * We queued it fine, so tell the upper layer 139 * that we consumed it. 140 */ 141 return (0); 142 } 143 /* calculate priority so drivers can find the tx queue */ 144 if (ieee80211_classify(ni, m)) { 145 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 146 ni->ni_macaddr, NULL, 147 "%s", "classification failure"); 148 vap->iv_stats.is_tx_classify++; 149 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 150 m_freem(m); 151 ieee80211_free_node(ni); 152 153 /* XXX better status? */ 154 return (0); 155 } 156 /* 157 * Stash the node pointer. Note that we do this after 158 * any call to ieee80211_dwds_mcast because that code 159 * uses any existing value for rcvif to identify the 160 * interface it (might have been) received on. 161 */ 162 m->m_pkthdr.rcvif = (void *)ni; 163 164 BPF_MTAP(ifp, m); /* 802.3 tx */ 165 166 /* 167 * Check if A-MPDU tx aggregation is setup or if we 168 * should try to enable it. The sta must be associated 169 * with HT and A-MPDU enabled for use. When the policy 170 * routine decides we should enable A-MPDU we issue an 171 * ADDBA request and wait for a reply. The frame being 172 * encapsulated will go out w/o using A-MPDU, or possibly 173 * it might be collected by the driver and held/retransmit. 174 * The default ic_ampdu_enable routine handles staggering 175 * ADDBA requests in case the receiver NAK's us or we are 176 * otherwise unable to establish a BA stream. 177 */ 178 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 179 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX)) { 180 if ((m->m_flags & M_EAPOL) == 0) { 181 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 182 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 183 184 ieee80211_txampdu_count_packet(tap); 185 if (IEEE80211_AMPDU_RUNNING(tap)) { 186 /* 187 * Operational, mark frame for aggregation. 188 * 189 * XXX do tx aggregation here 190 */ 191 m->m_flags |= M_AMPDU_MPDU; 192 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 193 ic->ic_ampdu_enable(ni, tap)) { 194 /* 195 * Not negotiated yet, request service. 196 */ 197 ieee80211_ampdu_request(ni, tap); 198 /* XXX hold frame for reply? */ 199 } 200 } 201 } 202 203 #ifdef IEEE80211_SUPPORT_SUPERG 204 /* 205 * Check for AMSDU/FF; queue for aggregation 206 * 207 * Note: we don't bother trying to do fast frames or 208 * A-MSDU encapsulation for 802.3 drivers. Now, we 209 * likely could do it for FF (because it's a magic 210 * atheros tunnel LLC type) but I don't think we're going 211 * to really need to. For A-MSDU we'd have to set the 212 * A-MSDU QoS bit in the wifi header, so we just plain 213 * can't do it. 214 * 215 * Strictly speaking, we could actually /do/ A-MSDU / FF 216 * with A-MPDU together which for certain circumstances 217 * is beneficial (eg A-MSDU of TCK ACKs.) However, 218 * I'll ignore that for now so existing behaviour is maintained. 219 * Later on it would be good to make "amsdu + ampdu" configurable. 220 */ 221 else if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 222 if ((! mcast) && ieee80211_amsdu_tx_ok(ni)) { 223 m = ieee80211_amsdu_check(ni, m); 224 if (m == NULL) { 225 /* NB: any ni ref held on stageq */ 226 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 227 "%s: amsdu_check queued frame\n", 228 __func__); 229 return (0); 230 } 231 } else if ((! mcast) && IEEE80211_ATH_CAP(vap, ni, 232 IEEE80211_NODE_FF)) { 233 m = ieee80211_ff_check(ni, m); 234 if (m == NULL) { 235 /* NB: any ni ref held on stageq */ 236 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 237 "%s: ff_check queued frame\n", 238 __func__); 239 return (0); 240 } 241 } 242 } 243 #endif /* IEEE80211_SUPPORT_SUPERG */ 244 245 /* 246 * Grab the TX lock - serialise the TX process from this 247 * point (where TX state is being checked/modified) 248 * through to driver queue. 249 */ 250 IEEE80211_TX_LOCK(ic); 251 252 /* 253 * XXX make the encap and transmit code a separate function 254 * so things like the FF (and later A-MSDU) path can just call 255 * it for flushed frames. 256 */ 257 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 258 /* 259 * Encapsulate the packet in prep for transmission. 260 */ 261 m = ieee80211_encap(vap, ni, m); 262 if (m == NULL) { 263 /* NB: stat+msg handled in ieee80211_encap */ 264 IEEE80211_TX_UNLOCK(ic); 265 ieee80211_free_node(ni); 266 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 267 return (ENOBUFS); 268 } 269 } 270 (void) ieee80211_parent_xmitpkt(ic, m); 271 272 /* 273 * Unlock at this point - no need to hold it across 274 * ieee80211_free_node() (ie, the comlock) 275 */ 276 IEEE80211_TX_UNLOCK(ic); 277 ic->ic_lastdata = ticks; 278 279 return (0); 280 } 281 282 283 284 /* 285 * Send the given mbuf through the given vap. 286 * 287 * This consumes the mbuf regardless of whether the transmit 288 * was successful or not. 289 * 290 * This does none of the initial checks that ieee80211_start() 291 * does (eg CAC timeout, interface wakeup) - the caller must 292 * do this first. 293 */ 294 static int 295 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 296 { 297 #define IS_DWDS(vap) \ 298 (vap->iv_opmode == IEEE80211_M_WDS && \ 299 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 300 struct ieee80211com *ic = vap->iv_ic; 301 struct ifnet *ifp = vap->iv_ifp; 302 struct ieee80211_node *ni; 303 struct ether_header *eh; 304 305 /* 306 * Cancel any background scan. 307 */ 308 if (ic->ic_flags & IEEE80211_F_SCAN) 309 ieee80211_cancel_anyscan(vap); 310 /* 311 * Find the node for the destination so we can do 312 * things like power save and fast frames aggregation. 313 * 314 * NB: past this point various code assumes the first 315 * mbuf has the 802.3 header present (and contiguous). 316 */ 317 ni = NULL; 318 if (m->m_len < sizeof(struct ether_header) && 319 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 320 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 321 "discard frame, %s\n", "m_pullup failed"); 322 vap->iv_stats.is_tx_nobuf++; /* XXX */ 323 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 324 return (ENOBUFS); 325 } 326 eh = mtod(m, struct ether_header *); 327 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 328 if (IS_DWDS(vap)) { 329 /* 330 * Only unicast frames from the above go out 331 * DWDS vaps; multicast frames are handled by 332 * dispatching the frame as it comes through 333 * the AP vap (see below). 334 */ 335 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 336 eh->ether_dhost, "mcast", "%s", "on DWDS"); 337 vap->iv_stats.is_dwds_mcast++; 338 m_freem(m); 339 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 340 /* XXX better status? */ 341 return (ENOBUFS); 342 } 343 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 344 /* 345 * Spam DWDS vap's w/ multicast traffic. 346 */ 347 /* XXX only if dwds in use? */ 348 ieee80211_dwds_mcast(vap, m); 349 } 350 } 351 #ifdef IEEE80211_SUPPORT_MESH 352 if (vap->iv_opmode != IEEE80211_M_MBSS) { 353 #endif 354 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 355 if (ni == NULL) { 356 /* NB: ieee80211_find_txnode does stat+msg */ 357 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 358 m_freem(m); 359 /* XXX better status? */ 360 return (ENOBUFS); 361 } 362 if (ni->ni_associd == 0 && 363 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 364 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 365 eh->ether_dhost, NULL, 366 "sta not associated (type 0x%04x)", 367 htons(eh->ether_type)); 368 vap->iv_stats.is_tx_notassoc++; 369 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 370 m_freem(m); 371 ieee80211_free_node(ni); 372 /* XXX better status? */ 373 return (ENOBUFS); 374 } 375 #ifdef IEEE80211_SUPPORT_MESH 376 } else { 377 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 378 /* 379 * Proxy station only if configured. 380 */ 381 if (!ieee80211_mesh_isproxyena(vap)) { 382 IEEE80211_DISCARD_MAC(vap, 383 IEEE80211_MSG_OUTPUT | 384 IEEE80211_MSG_MESH, 385 eh->ether_dhost, NULL, 386 "%s", "proxy not enabled"); 387 vap->iv_stats.is_mesh_notproxy++; 388 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 389 m_freem(m); 390 /* XXX better status? */ 391 return (ENOBUFS); 392 } 393 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 394 "forward frame from DS SA(%6D), DA(%6D)\n", 395 eh->ether_shost, ":", 396 eh->ether_dhost, ":"); 397 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 398 } 399 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 400 if (ni == NULL) { 401 /* 402 * NB: ieee80211_mesh_discover holds/disposes 403 * frame (e.g. queueing on path discovery). 404 */ 405 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 406 /* XXX better status? */ 407 return (ENOBUFS); 408 } 409 } 410 #endif 411 412 /* 413 * We've resolved the sender, so attempt to transmit it. 414 */ 415 416 if (vap->iv_state == IEEE80211_S_SLEEP) { 417 /* 418 * In power save; queue frame and then wakeup device 419 * for transmit. 420 */ 421 ic->ic_lastdata = ticks; 422 if (ieee80211_pwrsave(ni, m) != 0) 423 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 424 ieee80211_free_node(ni); 425 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 426 return (0); 427 } 428 429 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0) 430 return (ENOBUFS); 431 return (0); 432 #undef IS_DWDS 433 } 434 435 /* 436 * Start method for vap's. All packets from the stack come 437 * through here. We handle common processing of the packets 438 * before dispatching them to the underlying device. 439 * 440 * if_transmit() requires that the mbuf be consumed by this call 441 * regardless of the return condition. 442 */ 443 int 444 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m) 445 { 446 struct ieee80211vap *vap = ifp->if_softc; 447 struct ieee80211com *ic = vap->iv_ic; 448 449 /* 450 * No data frames go out unless we're running. 451 * Note in particular this covers CAC and CSA 452 * states (though maybe we should check muting 453 * for CSA). 454 */ 455 if (vap->iv_state != IEEE80211_S_RUN && 456 vap->iv_state != IEEE80211_S_SLEEP) { 457 IEEE80211_LOCK(ic); 458 /* re-check under the com lock to avoid races */ 459 if (vap->iv_state != IEEE80211_S_RUN && 460 vap->iv_state != IEEE80211_S_SLEEP) { 461 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 462 "%s: ignore queue, in %s state\n", 463 __func__, ieee80211_state_name[vap->iv_state]); 464 vap->iv_stats.is_tx_badstate++; 465 IEEE80211_UNLOCK(ic); 466 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 467 m_freem(m); 468 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 469 return (ENETDOWN); 470 } 471 IEEE80211_UNLOCK(ic); 472 } 473 474 /* 475 * Sanitize mbuf flags for net80211 use. We cannot 476 * clear M_PWR_SAV or M_MORE_DATA because these may 477 * be set for frames that are re-submitted from the 478 * power save queue. 479 * 480 * NB: This must be done before ieee80211_classify as 481 * it marks EAPOL in frames with M_EAPOL. 482 */ 483 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 484 485 /* 486 * Bump to the packet transmission path. 487 * The mbuf will be consumed here. 488 */ 489 return (ieee80211_start_pkt(vap, m)); 490 } 491 492 void 493 ieee80211_vap_qflush(struct ifnet *ifp) 494 { 495 496 /* Empty for now */ 497 } 498 499 /* 500 * 802.11 raw output routine. 501 * 502 * XXX TODO: this (and other send routines) should correctly 503 * XXX keep the pwr mgmt bit set if it decides to call into the 504 * XXX driver to send a frame whilst the state is SLEEP. 505 * 506 * Otherwise the peer may decide that we're awake and flood us 507 * with traffic we are still too asleep to receive! 508 */ 509 int 510 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 511 struct mbuf *m, const struct ieee80211_bpf_params *params) 512 { 513 struct ieee80211com *ic = vap->iv_ic; 514 int error; 515 516 /* 517 * Set node - the caller has taken a reference, so ensure 518 * that the mbuf has the same node value that 519 * it would if it were going via the normal path. 520 */ 521 m->m_pkthdr.rcvif = (void *)ni; 522 523 /* 524 * Attempt to add bpf transmit parameters. 525 * 526 * For now it's ok to fail; the raw_xmit api still takes 527 * them as an option. 528 * 529 * Later on when ic_raw_xmit() has params removed, 530 * they'll have to be added - so fail the transmit if 531 * they can't be. 532 */ 533 if (params) 534 (void) ieee80211_add_xmit_params(m, params); 535 536 error = ic->ic_raw_xmit(ni, m, params); 537 if (error) { 538 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1); 539 ieee80211_free_node(ni); 540 } 541 return (error); 542 } 543 544 /* 545 * 802.11 output routine. This is (currently) used only to 546 * connect bpf write calls to the 802.11 layer for injecting 547 * raw 802.11 frames. 548 */ 549 int 550 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 551 const struct sockaddr *dst, struct route *ro) 552 { 553 #define senderr(e) do { error = (e); goto bad;} while (0) 554 struct ieee80211_node *ni = NULL; 555 struct ieee80211vap *vap; 556 struct ieee80211_frame *wh; 557 struct ieee80211com *ic = NULL; 558 int error; 559 int ret; 560 561 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 562 /* 563 * Short-circuit requests if the vap is marked OACTIVE 564 * as this can happen because a packet came down through 565 * ieee80211_start before the vap entered RUN state in 566 * which case it's ok to just drop the frame. This 567 * should not be necessary but callers of if_output don't 568 * check OACTIVE. 569 */ 570 senderr(ENETDOWN); 571 } 572 vap = ifp->if_softc; 573 ic = vap->iv_ic; 574 /* 575 * Hand to the 802.3 code if not tagged as 576 * a raw 802.11 frame. 577 */ 578 if (dst->sa_family != AF_IEEE80211) 579 return vap->iv_output(ifp, m, dst, ro); 580 #ifdef MAC 581 error = mac_ifnet_check_transmit(ifp, m); 582 if (error) 583 senderr(error); 584 #endif 585 if (ifp->if_flags & IFF_MONITOR) 586 senderr(ENETDOWN); 587 if (!IFNET_IS_UP_RUNNING(ifp)) 588 senderr(ENETDOWN); 589 if (vap->iv_state == IEEE80211_S_CAC) { 590 IEEE80211_DPRINTF(vap, 591 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 592 "block %s frame in CAC state\n", "raw data"); 593 vap->iv_stats.is_tx_badstate++; 594 senderr(EIO); /* XXX */ 595 } else if (vap->iv_state == IEEE80211_S_SCAN) 596 senderr(EIO); 597 /* XXX bypass bridge, pfil, carp, etc. */ 598 599 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 600 senderr(EIO); /* XXX */ 601 wh = mtod(m, struct ieee80211_frame *); 602 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 603 IEEE80211_FC0_VERSION_0) 604 senderr(EIO); /* XXX */ 605 606 /* locate destination node */ 607 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 608 case IEEE80211_FC1_DIR_NODS: 609 case IEEE80211_FC1_DIR_FROMDS: 610 ni = ieee80211_find_txnode(vap, wh->i_addr1); 611 break; 612 case IEEE80211_FC1_DIR_TODS: 613 case IEEE80211_FC1_DIR_DSTODS: 614 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 615 senderr(EIO); /* XXX */ 616 ni = ieee80211_find_txnode(vap, wh->i_addr3); 617 break; 618 default: 619 senderr(EIO); /* XXX */ 620 } 621 if (ni == NULL) { 622 /* 623 * Permit packets w/ bpf params through regardless 624 * (see below about sa_len). 625 */ 626 if (dst->sa_len == 0) 627 senderr(EHOSTUNREACH); 628 ni = ieee80211_ref_node(vap->iv_bss); 629 } 630 631 /* 632 * Sanitize mbuf for net80211 flags leaked from above. 633 * 634 * NB: This must be done before ieee80211_classify as 635 * it marks EAPOL in frames with M_EAPOL. 636 */ 637 m->m_flags &= ~M_80211_TX; 638 639 /* calculate priority so drivers can find the tx queue */ 640 /* XXX assumes an 802.3 frame */ 641 if (ieee80211_classify(ni, m)) 642 senderr(EIO); /* XXX */ 643 644 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 645 IEEE80211_NODE_STAT(ni, tx_data); 646 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 647 IEEE80211_NODE_STAT(ni, tx_mcast); 648 m->m_flags |= M_MCAST; 649 } else 650 IEEE80211_NODE_STAT(ni, tx_ucast); 651 /* NB: ieee80211_encap does not include 802.11 header */ 652 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 653 654 IEEE80211_TX_LOCK(ic); 655 656 /* 657 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 658 * present by setting the sa_len field of the sockaddr (yes, 659 * this is a hack). 660 * NB: we assume sa_data is suitably aligned to cast. 661 */ 662 ret = ieee80211_raw_output(vap, ni, m, 663 (const struct ieee80211_bpf_params *)(dst->sa_len ? 664 dst->sa_data : NULL)); 665 IEEE80211_TX_UNLOCK(ic); 666 return (ret); 667 bad: 668 if (m != NULL) 669 m_freem(m); 670 if (ni != NULL) 671 ieee80211_free_node(ni); 672 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 673 return error; 674 #undef senderr 675 } 676 677 /* 678 * Set the direction field and address fields of an outgoing 679 * frame. Note this should be called early on in constructing 680 * a frame as it sets i_fc[1]; other bits can then be or'd in. 681 */ 682 void 683 ieee80211_send_setup( 684 struct ieee80211_node *ni, 685 struct mbuf *m, 686 int type, int tid, 687 const uint8_t sa[IEEE80211_ADDR_LEN], 688 const uint8_t da[IEEE80211_ADDR_LEN], 689 const uint8_t bssid[IEEE80211_ADDR_LEN]) 690 { 691 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 692 struct ieee80211vap *vap = ni->ni_vap; 693 struct ieee80211_tx_ampdu *tap; 694 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 695 ieee80211_seq seqno; 696 697 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic); 698 699 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 700 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 701 switch (vap->iv_opmode) { 702 case IEEE80211_M_STA: 703 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 704 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 705 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 706 IEEE80211_ADDR_COPY(wh->i_addr3, da); 707 break; 708 case IEEE80211_M_IBSS: 709 case IEEE80211_M_AHDEMO: 710 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 711 IEEE80211_ADDR_COPY(wh->i_addr1, da); 712 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 713 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 714 break; 715 case IEEE80211_M_HOSTAP: 716 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 717 IEEE80211_ADDR_COPY(wh->i_addr1, da); 718 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 719 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 720 break; 721 case IEEE80211_M_WDS: 722 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 723 IEEE80211_ADDR_COPY(wh->i_addr1, da); 724 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 725 IEEE80211_ADDR_COPY(wh->i_addr3, da); 726 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 727 break; 728 case IEEE80211_M_MBSS: 729 #ifdef IEEE80211_SUPPORT_MESH 730 if (IEEE80211_IS_MULTICAST(da)) { 731 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 732 /* XXX next hop */ 733 IEEE80211_ADDR_COPY(wh->i_addr1, da); 734 IEEE80211_ADDR_COPY(wh->i_addr2, 735 vap->iv_myaddr); 736 } else { 737 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 738 IEEE80211_ADDR_COPY(wh->i_addr1, da); 739 IEEE80211_ADDR_COPY(wh->i_addr2, 740 vap->iv_myaddr); 741 IEEE80211_ADDR_COPY(wh->i_addr3, da); 742 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 743 } 744 #endif 745 break; 746 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 747 break; 748 } 749 } else { 750 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 751 IEEE80211_ADDR_COPY(wh->i_addr1, da); 752 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 753 #ifdef IEEE80211_SUPPORT_MESH 754 if (vap->iv_opmode == IEEE80211_M_MBSS) 755 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 756 else 757 #endif 758 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 759 } 760 *(uint16_t *)&wh->i_dur[0] = 0; 761 762 tap = &ni->ni_tx_ampdu[tid]; 763 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 764 m->m_flags |= M_AMPDU_MPDU; 765 else { 766 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK, 767 type & IEEE80211_FC0_SUBTYPE_MASK)) 768 seqno = ni->ni_txseqs[tid]++; 769 else 770 seqno = 0; 771 772 *(uint16_t *)&wh->i_seq[0] = 773 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 774 M_SEQNO_SET(m, seqno); 775 } 776 777 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 778 m->m_flags |= M_MCAST; 779 #undef WH4 780 } 781 782 /* 783 * Send a management frame to the specified node. The node pointer 784 * must have a reference as the pointer will be passed to the driver 785 * and potentially held for a long time. If the frame is successfully 786 * dispatched to the driver, then it is responsible for freeing the 787 * reference (and potentially free'ing up any associated storage); 788 * otherwise deal with reclaiming any reference (on error). 789 */ 790 int 791 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 792 struct ieee80211_bpf_params *params) 793 { 794 struct ieee80211vap *vap = ni->ni_vap; 795 struct ieee80211com *ic = ni->ni_ic; 796 struct ieee80211_frame *wh; 797 int ret; 798 799 KASSERT(ni != NULL, ("null node")); 800 801 if (vap->iv_state == IEEE80211_S_CAC) { 802 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 803 ni, "block %s frame in CAC state", 804 ieee80211_mgt_subtype_name(type)); 805 vap->iv_stats.is_tx_badstate++; 806 ieee80211_free_node(ni); 807 m_freem(m); 808 return EIO; /* XXX */ 809 } 810 811 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 812 if (m == NULL) { 813 ieee80211_free_node(ni); 814 return ENOMEM; 815 } 816 817 IEEE80211_TX_LOCK(ic); 818 819 wh = mtod(m, struct ieee80211_frame *); 820 ieee80211_send_setup(ni, m, 821 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 822 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 823 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 824 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 825 "encrypting frame (%s)", __func__); 826 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 827 } 828 m->m_flags |= M_ENCAP; /* mark encapsulated */ 829 830 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 831 M_WME_SETAC(m, params->ibp_pri); 832 833 #ifdef IEEE80211_DEBUG 834 /* avoid printing too many frames */ 835 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 836 ieee80211_msg_dumppkts(vap)) { 837 printf("[%s] send %s on channel %u\n", 838 ether_sprintf(wh->i_addr1), 839 ieee80211_mgt_subtype_name(type), 840 ieee80211_chan2ieee(ic, ic->ic_curchan)); 841 } 842 #endif 843 IEEE80211_NODE_STAT(ni, tx_mgmt); 844 845 ret = ieee80211_raw_output(vap, ni, m, params); 846 IEEE80211_TX_UNLOCK(ic); 847 return (ret); 848 } 849 850 static void 851 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg, 852 int status) 853 { 854 struct ieee80211vap *vap = ni->ni_vap; 855 856 wakeup(vap); 857 } 858 859 /* 860 * Send a null data frame to the specified node. If the station 861 * is setup for QoS then a QoS Null Data frame is constructed. 862 * If this is a WDS station then a 4-address frame is constructed. 863 * 864 * NB: the caller is assumed to have setup a node reference 865 * for use; this is necessary to deal with a race condition 866 * when probing for inactive stations. Like ieee80211_mgmt_output 867 * we must cleanup any node reference on error; however we 868 * can safely just unref it as we know it will never be the 869 * last reference to the node. 870 */ 871 int 872 ieee80211_send_nulldata(struct ieee80211_node *ni) 873 { 874 struct ieee80211vap *vap = ni->ni_vap; 875 struct ieee80211com *ic = ni->ni_ic; 876 struct mbuf *m; 877 struct ieee80211_frame *wh; 878 int hdrlen; 879 uint8_t *frm; 880 int ret; 881 882 if (vap->iv_state == IEEE80211_S_CAC) { 883 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 884 ni, "block %s frame in CAC state", "null data"); 885 ieee80211_unref_node(&ni); 886 vap->iv_stats.is_tx_badstate++; 887 return EIO; /* XXX */ 888 } 889 890 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 891 hdrlen = sizeof(struct ieee80211_qosframe); 892 else 893 hdrlen = sizeof(struct ieee80211_frame); 894 /* NB: only WDS vap's get 4-address frames */ 895 if (vap->iv_opmode == IEEE80211_M_WDS) 896 hdrlen += IEEE80211_ADDR_LEN; 897 if (ic->ic_flags & IEEE80211_F_DATAPAD) 898 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 899 900 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 901 if (m == NULL) { 902 /* XXX debug msg */ 903 ieee80211_unref_node(&ni); 904 vap->iv_stats.is_tx_nobuf++; 905 return ENOMEM; 906 } 907 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 908 ("leading space %zd", M_LEADINGSPACE(m))); 909 M_PREPEND(m, hdrlen, M_NOWAIT); 910 if (m == NULL) { 911 /* NB: cannot happen */ 912 ieee80211_free_node(ni); 913 return ENOMEM; 914 } 915 916 IEEE80211_TX_LOCK(ic); 917 918 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 919 if (ni->ni_flags & IEEE80211_NODE_QOS) { 920 const int tid = WME_AC_TO_TID(WME_AC_BE); 921 uint8_t *qos; 922 923 ieee80211_send_setup(ni, m, 924 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 925 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 926 927 if (vap->iv_opmode == IEEE80211_M_WDS) 928 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 929 else 930 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 931 qos[0] = tid & IEEE80211_QOS_TID; 932 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 933 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 934 qos[1] = 0; 935 } else { 936 ieee80211_send_setup(ni, m, 937 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 938 IEEE80211_NONQOS_TID, 939 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 940 } 941 if (vap->iv_opmode != IEEE80211_M_WDS) { 942 /* NB: power management bit is never sent by an AP */ 943 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 944 vap->iv_opmode != IEEE80211_M_HOSTAP) 945 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 946 } 947 if ((ic->ic_flags & IEEE80211_F_SCAN) && 948 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) { 949 ieee80211_add_callback(m, ieee80211_nulldata_transmitted, 950 NULL); 951 } 952 m->m_len = m->m_pkthdr.len = hdrlen; 953 m->m_flags |= M_ENCAP; /* mark encapsulated */ 954 955 M_WME_SETAC(m, WME_AC_BE); 956 957 IEEE80211_NODE_STAT(ni, tx_data); 958 959 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 960 "send %snull data frame on channel %u, pwr mgt %s", 961 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 962 ieee80211_chan2ieee(ic, ic->ic_curchan), 963 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 964 965 ret = ieee80211_raw_output(vap, ni, m, NULL); 966 IEEE80211_TX_UNLOCK(ic); 967 return (ret); 968 } 969 970 /* 971 * Assign priority to a frame based on any vlan tag assigned 972 * to the station and/or any Diffserv setting in an IP header. 973 * Finally, if an ACM policy is setup (in station mode) it's 974 * applied. 975 */ 976 int 977 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 978 { 979 const struct ether_header *eh = mtod(m, struct ether_header *); 980 int v_wme_ac, d_wme_ac, ac; 981 982 /* 983 * Always promote PAE/EAPOL frames to high priority. 984 */ 985 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 986 /* NB: mark so others don't need to check header */ 987 m->m_flags |= M_EAPOL; 988 ac = WME_AC_VO; 989 goto done; 990 } 991 /* 992 * Non-qos traffic goes to BE. 993 */ 994 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 995 ac = WME_AC_BE; 996 goto done; 997 } 998 999 /* 1000 * If node has a vlan tag then all traffic 1001 * to it must have a matching tag. 1002 */ 1003 v_wme_ac = 0; 1004 if (ni->ni_vlan != 0) { 1005 if ((m->m_flags & M_VLANTAG) == 0) { 1006 IEEE80211_NODE_STAT(ni, tx_novlantag); 1007 return 1; 1008 } 1009 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 1010 EVL_VLANOFTAG(ni->ni_vlan)) { 1011 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1012 return 1; 1013 } 1014 /* map vlan priority to AC */ 1015 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 1016 } 1017 1018 /* XXX m_copydata may be too slow for fast path */ 1019 #ifdef INET 1020 if (eh->ether_type == htons(ETHERTYPE_IP)) { 1021 uint8_t tos; 1022 /* 1023 * IP frame, map the DSCP bits from the TOS field. 1024 */ 1025 /* NB: ip header may not be in first mbuf */ 1026 m_copydata(m, sizeof(struct ether_header) + 1027 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 1028 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1029 d_wme_ac = TID_TO_WME_AC(tos); 1030 } else { 1031 #endif /* INET */ 1032 #ifdef INET6 1033 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 1034 uint32_t flow; 1035 uint8_t tos; 1036 /* 1037 * IPv6 frame, map the DSCP bits from the traffic class field. 1038 */ 1039 m_copydata(m, sizeof(struct ether_header) + 1040 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 1041 (caddr_t) &flow); 1042 tos = (uint8_t)(ntohl(flow) >> 20); 1043 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1044 d_wme_ac = TID_TO_WME_AC(tos); 1045 } else { 1046 #endif /* INET6 */ 1047 d_wme_ac = WME_AC_BE; 1048 #ifdef INET6 1049 } 1050 #endif 1051 #ifdef INET 1052 } 1053 #endif 1054 /* 1055 * Use highest priority AC. 1056 */ 1057 if (v_wme_ac > d_wme_ac) 1058 ac = v_wme_ac; 1059 else 1060 ac = d_wme_ac; 1061 1062 /* 1063 * Apply ACM policy. 1064 */ 1065 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 1066 static const int acmap[4] = { 1067 WME_AC_BK, /* WME_AC_BE */ 1068 WME_AC_BK, /* WME_AC_BK */ 1069 WME_AC_BE, /* WME_AC_VI */ 1070 WME_AC_VI, /* WME_AC_VO */ 1071 }; 1072 struct ieee80211com *ic = ni->ni_ic; 1073 1074 while (ac != WME_AC_BK && 1075 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 1076 ac = acmap[ac]; 1077 } 1078 done: 1079 M_WME_SETAC(m, ac); 1080 return 0; 1081 } 1082 1083 /* 1084 * Insure there is sufficient contiguous space to encapsulate the 1085 * 802.11 data frame. If room isn't already there, arrange for it. 1086 * Drivers and cipher modules assume we have done the necessary work 1087 * and fail rudely if they don't find the space they need. 1088 */ 1089 struct mbuf * 1090 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 1091 struct ieee80211_key *key, struct mbuf *m) 1092 { 1093 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 1094 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 1095 1096 if (key != NULL) { 1097 /* XXX belongs in crypto code? */ 1098 needed_space += key->wk_cipher->ic_header; 1099 /* XXX frags */ 1100 /* 1101 * When crypto is being done in the host we must insure 1102 * the data are writable for the cipher routines; clone 1103 * a writable mbuf chain. 1104 * XXX handle SWMIC specially 1105 */ 1106 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 1107 m = m_unshare(m, M_NOWAIT); 1108 if (m == NULL) { 1109 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1110 "%s: cannot get writable mbuf\n", __func__); 1111 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1112 return NULL; 1113 } 1114 } 1115 } 1116 /* 1117 * We know we are called just before stripping an Ethernet 1118 * header and prepending an LLC header. This means we know 1119 * there will be 1120 * sizeof(struct ether_header) - sizeof(struct llc) 1121 * bytes recovered to which we need additional space for the 1122 * 802.11 header and any crypto header. 1123 */ 1124 /* XXX check trailing space and copy instead? */ 1125 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1126 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1127 if (n == NULL) { 1128 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1129 "%s: cannot expand storage\n", __func__); 1130 vap->iv_stats.is_tx_nobuf++; 1131 m_freem(m); 1132 return NULL; 1133 } 1134 KASSERT(needed_space <= MHLEN, 1135 ("not enough room, need %u got %d\n", needed_space, MHLEN)); 1136 /* 1137 * Setup new mbuf to have leading space to prepend the 1138 * 802.11 header and any crypto header bits that are 1139 * required (the latter are added when the driver calls 1140 * back to ieee80211_crypto_encap to do crypto encapsulation). 1141 */ 1142 /* NB: must be first 'cuz it clobbers m_data */ 1143 m_move_pkthdr(n, m); 1144 n->m_len = 0; /* NB: m_gethdr does not set */ 1145 n->m_data += needed_space; 1146 /* 1147 * Pull up Ethernet header to create the expected layout. 1148 * We could use m_pullup but that's overkill (i.e. we don't 1149 * need the actual data) and it cannot fail so do it inline 1150 * for speed. 1151 */ 1152 /* NB: struct ether_header is known to be contiguous */ 1153 n->m_len += sizeof(struct ether_header); 1154 m->m_len -= sizeof(struct ether_header); 1155 m->m_data += sizeof(struct ether_header); 1156 /* 1157 * Replace the head of the chain. 1158 */ 1159 n->m_next = m; 1160 m = n; 1161 } 1162 return m; 1163 #undef TO_BE_RECLAIMED 1164 } 1165 1166 /* 1167 * Return the transmit key to use in sending a unicast frame. 1168 * If a unicast key is set we use that. When no unicast key is set 1169 * we fall back to the default transmit key. 1170 */ 1171 static __inline struct ieee80211_key * 1172 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1173 struct ieee80211_node *ni) 1174 { 1175 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1176 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1177 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1178 return NULL; 1179 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1180 } else { 1181 return &ni->ni_ucastkey; 1182 } 1183 } 1184 1185 /* 1186 * Return the transmit key to use in sending a multicast frame. 1187 * Multicast traffic always uses the group key which is installed as 1188 * the default tx key. 1189 */ 1190 static __inline struct ieee80211_key * 1191 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1192 struct ieee80211_node *ni) 1193 { 1194 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1195 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1196 return NULL; 1197 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1198 } 1199 1200 /* 1201 * Encapsulate an outbound data frame. The mbuf chain is updated. 1202 * If an error is encountered NULL is returned. The caller is required 1203 * to provide a node reference and pullup the ethernet header in the 1204 * first mbuf. 1205 * 1206 * NB: Packet is assumed to be processed by ieee80211_classify which 1207 * marked EAPOL frames w/ M_EAPOL. 1208 */ 1209 struct mbuf * 1210 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1211 struct mbuf *m) 1212 { 1213 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1214 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1215 struct ieee80211com *ic = ni->ni_ic; 1216 #ifdef IEEE80211_SUPPORT_MESH 1217 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1218 struct ieee80211_meshcntl_ae10 *mc; 1219 struct ieee80211_mesh_route *rt = NULL; 1220 int dir = -1; 1221 #endif 1222 struct ether_header eh; 1223 struct ieee80211_frame *wh; 1224 struct ieee80211_key *key; 1225 struct llc *llc; 1226 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1227 ieee80211_seq seqno; 1228 int meshhdrsize, meshae; 1229 uint8_t *qos; 1230 int is_amsdu = 0; 1231 1232 IEEE80211_TX_LOCK_ASSERT(ic); 1233 1234 /* 1235 * Copy existing Ethernet header to a safe place. The 1236 * rest of the code assumes it's ok to strip it when 1237 * reorganizing state for the final encapsulation. 1238 */ 1239 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1240 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1241 1242 /* 1243 * Insure space for additional headers. First identify 1244 * transmit key to use in calculating any buffer adjustments 1245 * required. This is also used below to do privacy 1246 * encapsulation work. Then calculate the 802.11 header 1247 * size and any padding required by the driver. 1248 * 1249 * Note key may be NULL if we fall back to the default 1250 * transmit key and that is not set. In that case the 1251 * buffer may not be expanded as needed by the cipher 1252 * routines, but they will/should discard it. 1253 */ 1254 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1255 if (vap->iv_opmode == IEEE80211_M_STA || 1256 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1257 (vap->iv_opmode == IEEE80211_M_WDS && 1258 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1259 key = ieee80211_crypto_getucastkey(vap, ni); 1260 else 1261 key = ieee80211_crypto_getmcastkey(vap, ni); 1262 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1263 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1264 eh.ether_dhost, 1265 "no default transmit key (%s) deftxkey %u", 1266 __func__, vap->iv_def_txkey); 1267 vap->iv_stats.is_tx_nodefkey++; 1268 goto bad; 1269 } 1270 } else 1271 key = NULL; 1272 /* 1273 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1274 * frames so suppress use. This may be an issue if other 1275 * ap's require all data frames to be QoS-encapsulated 1276 * once negotiated in which case we'll need to make this 1277 * configurable. 1278 * NB: mesh data frames are QoS. 1279 */ 1280 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1281 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1282 (m->m_flags & M_EAPOL) == 0; 1283 if (addqos) 1284 hdrsize = sizeof(struct ieee80211_qosframe); 1285 else 1286 hdrsize = sizeof(struct ieee80211_frame); 1287 #ifdef IEEE80211_SUPPORT_MESH 1288 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1289 /* 1290 * Mesh data frames are encapsulated according to the 1291 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1292 * o Group Addressed data (aka multicast) originating 1293 * at the local sta are sent w/ 3-address format and 1294 * address extension mode 00 1295 * o Individually Addressed data (aka unicast) originating 1296 * at the local sta are sent w/ 4-address format and 1297 * address extension mode 00 1298 * o Group Addressed data forwarded from a non-mesh sta are 1299 * sent w/ 3-address format and address extension mode 01 1300 * o Individually Address data from another sta are sent 1301 * w/ 4-address format and address extension mode 10 1302 */ 1303 is4addr = 0; /* NB: don't use, disable */ 1304 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1305 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1306 KASSERT(rt != NULL, ("route is NULL")); 1307 dir = IEEE80211_FC1_DIR_DSTODS; 1308 hdrsize += IEEE80211_ADDR_LEN; 1309 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1310 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1311 vap->iv_myaddr)) { 1312 IEEE80211_NOTE_MAC(vap, 1313 IEEE80211_MSG_MESH, 1314 eh.ether_dhost, 1315 "%s", "trying to send to ourself"); 1316 goto bad; 1317 } 1318 meshae = IEEE80211_MESH_AE_10; 1319 meshhdrsize = 1320 sizeof(struct ieee80211_meshcntl_ae10); 1321 } else { 1322 meshae = IEEE80211_MESH_AE_00; 1323 meshhdrsize = 1324 sizeof(struct ieee80211_meshcntl); 1325 } 1326 } else { 1327 dir = IEEE80211_FC1_DIR_FROMDS; 1328 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1329 /* proxy group */ 1330 meshae = IEEE80211_MESH_AE_01; 1331 meshhdrsize = 1332 sizeof(struct ieee80211_meshcntl_ae01); 1333 } else { 1334 /* group */ 1335 meshae = IEEE80211_MESH_AE_00; 1336 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1337 } 1338 } 1339 } else { 1340 #endif 1341 /* 1342 * 4-address frames need to be generated for: 1343 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1344 * o packets sent through a vap marked for relaying 1345 * (e.g. a station operating with dynamic WDS) 1346 */ 1347 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1348 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1349 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1350 if (is4addr) 1351 hdrsize += IEEE80211_ADDR_LEN; 1352 meshhdrsize = meshae = 0; 1353 #ifdef IEEE80211_SUPPORT_MESH 1354 } 1355 #endif 1356 /* 1357 * Honor driver DATAPAD requirement. 1358 */ 1359 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1360 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1361 else 1362 hdrspace = hdrsize; 1363 1364 if (__predict_true((m->m_flags & M_FF) == 0)) { 1365 /* 1366 * Normal frame. 1367 */ 1368 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1369 if (m == NULL) { 1370 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1371 goto bad; 1372 } 1373 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1374 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1375 llc = mtod(m, struct llc *); 1376 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1377 llc->llc_control = LLC_UI; 1378 llc->llc_snap.org_code[0] = 0; 1379 llc->llc_snap.org_code[1] = 0; 1380 llc->llc_snap.org_code[2] = 0; 1381 llc->llc_snap.ether_type = eh.ether_type; 1382 } else { 1383 #ifdef IEEE80211_SUPPORT_SUPERG 1384 /* 1385 * Aggregated frame. Check if it's for AMSDU or FF. 1386 * 1387 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented 1388 * anywhere for some reason. But, since 11n requires 1389 * AMSDU RX, we can just assume "11n" == "AMSDU". 1390 */ 1391 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__); 1392 if (ieee80211_amsdu_tx_ok(ni)) { 1393 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key); 1394 is_amsdu = 1; 1395 } else { 1396 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1397 } 1398 if (m == NULL) 1399 #endif 1400 goto bad; 1401 } 1402 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1403 1404 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1405 if (m == NULL) { 1406 vap->iv_stats.is_tx_nobuf++; 1407 goto bad; 1408 } 1409 wh = mtod(m, struct ieee80211_frame *); 1410 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1411 *(uint16_t *)wh->i_dur = 0; 1412 qos = NULL; /* NB: quiet compiler */ 1413 if (is4addr) { 1414 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1415 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1416 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1417 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1418 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1419 } else switch (vap->iv_opmode) { 1420 case IEEE80211_M_STA: 1421 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1422 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1423 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1424 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1425 break; 1426 case IEEE80211_M_IBSS: 1427 case IEEE80211_M_AHDEMO: 1428 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1429 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1430 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1431 /* 1432 * NB: always use the bssid from iv_bss as the 1433 * neighbor's may be stale after an ibss merge 1434 */ 1435 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1436 break; 1437 case IEEE80211_M_HOSTAP: 1438 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1439 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1440 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1441 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1442 break; 1443 #ifdef IEEE80211_SUPPORT_MESH 1444 case IEEE80211_M_MBSS: 1445 /* NB: offset by hdrspace to deal with DATAPAD */ 1446 mc = (struct ieee80211_meshcntl_ae10 *) 1447 (mtod(m, uint8_t *) + hdrspace); 1448 wh->i_fc[1] = dir; 1449 switch (meshae) { 1450 case IEEE80211_MESH_AE_00: /* no proxy */ 1451 mc->mc_flags = 0; 1452 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1453 IEEE80211_ADDR_COPY(wh->i_addr1, 1454 ni->ni_macaddr); 1455 IEEE80211_ADDR_COPY(wh->i_addr2, 1456 vap->iv_myaddr); 1457 IEEE80211_ADDR_COPY(wh->i_addr3, 1458 eh.ether_dhost); 1459 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1460 eh.ether_shost); 1461 qos =((struct ieee80211_qosframe_addr4 *) 1462 wh)->i_qos; 1463 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1464 /* mcast */ 1465 IEEE80211_ADDR_COPY(wh->i_addr1, 1466 eh.ether_dhost); 1467 IEEE80211_ADDR_COPY(wh->i_addr2, 1468 vap->iv_myaddr); 1469 IEEE80211_ADDR_COPY(wh->i_addr3, 1470 eh.ether_shost); 1471 qos = ((struct ieee80211_qosframe *) 1472 wh)->i_qos; 1473 } 1474 break; 1475 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1476 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1477 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1478 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1479 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1480 mc->mc_flags = 1; 1481 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1482 eh.ether_shost); 1483 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1484 break; 1485 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1486 KASSERT(rt != NULL, ("route is NULL")); 1487 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1488 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1489 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1490 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1491 mc->mc_flags = IEEE80211_MESH_AE_10; 1492 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1493 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1494 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1495 break; 1496 default: 1497 KASSERT(0, ("meshae %d", meshae)); 1498 break; 1499 } 1500 mc->mc_ttl = ms->ms_ttl; 1501 ms->ms_seq++; 1502 le32enc(mc->mc_seq, ms->ms_seq); 1503 break; 1504 #endif 1505 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1506 default: 1507 goto bad; 1508 } 1509 if (m->m_flags & M_MORE_DATA) 1510 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1511 if (addqos) { 1512 int ac, tid; 1513 1514 if (is4addr) { 1515 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1516 /* NB: mesh case handled earlier */ 1517 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1518 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1519 ac = M_WME_GETAC(m); 1520 /* map from access class/queue to 11e header priorty value */ 1521 tid = WME_AC_TO_TID(ac); 1522 qos[0] = tid & IEEE80211_QOS_TID; 1523 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1524 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1525 #ifdef IEEE80211_SUPPORT_MESH 1526 if (vap->iv_opmode == IEEE80211_M_MBSS) 1527 qos[1] = IEEE80211_QOS_MC; 1528 else 1529 #endif 1530 qos[1] = 0; 1531 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1532 1533 /* 1534 * If this is an A-MSDU then ensure we set the 1535 * relevant field. 1536 */ 1537 if (is_amsdu) 1538 qos[0] |= IEEE80211_QOS_AMSDU; 1539 1540 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1541 /* 1542 * NB: don't assign a sequence # to potential 1543 * aggregates; we expect this happens at the 1544 * point the frame comes off any aggregation q 1545 * as otherwise we may introduce holes in the 1546 * BA sequence space and/or make window accouting 1547 * more difficult. 1548 * 1549 * XXX may want to control this with a driver 1550 * capability; this may also change when we pull 1551 * aggregation up into net80211 1552 */ 1553 seqno = ni->ni_txseqs[tid]++; 1554 *(uint16_t *)wh->i_seq = 1555 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1556 M_SEQNO_SET(m, seqno); 1557 } 1558 } else { 1559 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1560 *(uint16_t *)wh->i_seq = 1561 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1562 M_SEQNO_SET(m, seqno); 1563 1564 /* 1565 * XXX TODO: we shouldn't allow EAPOL, etc that would 1566 * be forced to be non-QoS traffic to be A-MSDU encapsulated. 1567 */ 1568 if (is_amsdu) 1569 printf("%s: XXX ERROR: is_amsdu set; not QoS!\n", 1570 __func__); 1571 } 1572 1573 1574 /* check if xmit fragmentation is required */ 1575 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1576 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1577 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1578 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1579 if (key != NULL) { 1580 /* 1581 * IEEE 802.1X: send EAPOL frames always in the clear. 1582 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1583 */ 1584 if ((m->m_flags & M_EAPOL) == 0 || 1585 ((vap->iv_flags & IEEE80211_F_WPA) && 1586 (vap->iv_opmode == IEEE80211_M_STA ? 1587 !IEEE80211_KEY_UNDEFINED(key) : 1588 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1589 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 1590 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1591 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1592 eh.ether_dhost, 1593 "%s", "enmic failed, discard frame"); 1594 vap->iv_stats.is_crypto_enmicfail++; 1595 goto bad; 1596 } 1597 } 1598 } 1599 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1600 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1601 goto bad; 1602 1603 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1604 1605 IEEE80211_NODE_STAT(ni, tx_data); 1606 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1607 IEEE80211_NODE_STAT(ni, tx_mcast); 1608 m->m_flags |= M_MCAST; 1609 } else 1610 IEEE80211_NODE_STAT(ni, tx_ucast); 1611 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1612 1613 return m; 1614 bad: 1615 if (m != NULL) 1616 m_freem(m); 1617 return NULL; 1618 #undef WH4 1619 #undef MC01 1620 } 1621 1622 void 1623 ieee80211_free_mbuf(struct mbuf *m) 1624 { 1625 struct mbuf *next; 1626 1627 if (m == NULL) 1628 return; 1629 1630 do { 1631 next = m->m_nextpkt; 1632 m->m_nextpkt = NULL; 1633 m_freem(m); 1634 } while ((m = next) != NULL); 1635 } 1636 1637 /* 1638 * Fragment the frame according to the specified mtu. 1639 * The size of the 802.11 header (w/o padding) is provided 1640 * so we don't need to recalculate it. We create a new 1641 * mbuf for each fragment and chain it through m_nextpkt; 1642 * we might be able to optimize this by reusing the original 1643 * packet's mbufs but that is significantly more complicated. 1644 */ 1645 static int 1646 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1647 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1648 { 1649 struct ieee80211com *ic = vap->iv_ic; 1650 struct ieee80211_frame *wh, *whf; 1651 struct mbuf *m, *prev; 1652 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1653 u_int hdrspace; 1654 1655 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1656 KASSERT(m0->m_pkthdr.len > mtu, 1657 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1658 1659 /* 1660 * Honor driver DATAPAD requirement. 1661 */ 1662 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1663 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1664 else 1665 hdrspace = hdrsize; 1666 1667 wh = mtod(m0, struct ieee80211_frame *); 1668 /* NB: mark the first frag; it will be propagated below */ 1669 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1670 totalhdrsize = hdrspace + ciphdrsize; 1671 fragno = 1; 1672 off = mtu - ciphdrsize; 1673 remainder = m0->m_pkthdr.len - off; 1674 prev = m0; 1675 do { 1676 fragsize = totalhdrsize + remainder; 1677 if (fragsize > mtu) 1678 fragsize = mtu; 1679 /* XXX fragsize can be >2048! */ 1680 KASSERT(fragsize < MCLBYTES, 1681 ("fragment size %u too big!", fragsize)); 1682 if (fragsize > MHLEN) 1683 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1684 else 1685 m = m_gethdr(M_NOWAIT, MT_DATA); 1686 if (m == NULL) 1687 goto bad; 1688 /* leave room to prepend any cipher header */ 1689 m_align(m, fragsize - ciphdrsize); 1690 1691 /* 1692 * Form the header in the fragment. Note that since 1693 * we mark the first fragment with the MORE_FRAG bit 1694 * it automatically is propagated to each fragment; we 1695 * need only clear it on the last fragment (done below). 1696 * NB: frag 1+ dont have Mesh Control field present. 1697 */ 1698 whf = mtod(m, struct ieee80211_frame *); 1699 memcpy(whf, wh, hdrsize); 1700 #ifdef IEEE80211_SUPPORT_MESH 1701 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1702 if (IEEE80211_IS_DSTODS(wh)) 1703 ((struct ieee80211_qosframe_addr4 *) 1704 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1705 else 1706 ((struct ieee80211_qosframe *) 1707 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1708 } 1709 #endif 1710 *(uint16_t *)&whf->i_seq[0] |= htole16( 1711 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1712 IEEE80211_SEQ_FRAG_SHIFT); 1713 fragno++; 1714 1715 payload = fragsize - totalhdrsize; 1716 /* NB: destination is known to be contiguous */ 1717 1718 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace); 1719 m->m_len = hdrspace + payload; 1720 m->m_pkthdr.len = hdrspace + payload; 1721 m->m_flags |= M_FRAG; 1722 1723 /* chain up the fragment */ 1724 prev->m_nextpkt = m; 1725 prev = m; 1726 1727 /* deduct fragment just formed */ 1728 remainder -= payload; 1729 off += payload; 1730 } while (remainder != 0); 1731 1732 /* set the last fragment */ 1733 m->m_flags |= M_LASTFRAG; 1734 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1735 1736 /* strip first mbuf now that everything has been copied */ 1737 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1738 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1739 1740 vap->iv_stats.is_tx_fragframes++; 1741 vap->iv_stats.is_tx_frags += fragno-1; 1742 1743 return 1; 1744 bad: 1745 /* reclaim fragments but leave original frame for caller to free */ 1746 ieee80211_free_mbuf(m0->m_nextpkt); 1747 m0->m_nextpkt = NULL; 1748 return 0; 1749 } 1750 1751 /* 1752 * Add a supported rates element id to a frame. 1753 */ 1754 uint8_t * 1755 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1756 { 1757 int nrates; 1758 1759 *frm++ = IEEE80211_ELEMID_RATES; 1760 nrates = rs->rs_nrates; 1761 if (nrates > IEEE80211_RATE_SIZE) 1762 nrates = IEEE80211_RATE_SIZE; 1763 *frm++ = nrates; 1764 memcpy(frm, rs->rs_rates, nrates); 1765 return frm + nrates; 1766 } 1767 1768 /* 1769 * Add an extended supported rates element id to a frame. 1770 */ 1771 uint8_t * 1772 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1773 { 1774 /* 1775 * Add an extended supported rates element if operating in 11g mode. 1776 */ 1777 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1778 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1779 *frm++ = IEEE80211_ELEMID_XRATES; 1780 *frm++ = nrates; 1781 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1782 frm += nrates; 1783 } 1784 return frm; 1785 } 1786 1787 /* 1788 * Add an ssid element to a frame. 1789 */ 1790 uint8_t * 1791 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1792 { 1793 *frm++ = IEEE80211_ELEMID_SSID; 1794 *frm++ = len; 1795 memcpy(frm, ssid, len); 1796 return frm + len; 1797 } 1798 1799 /* 1800 * Add an erp element to a frame. 1801 */ 1802 static uint8_t * 1803 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1804 { 1805 uint8_t erp; 1806 1807 *frm++ = IEEE80211_ELEMID_ERP; 1808 *frm++ = 1; 1809 erp = 0; 1810 if (ic->ic_nonerpsta != 0) 1811 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1812 if (ic->ic_flags & IEEE80211_F_USEPROT) 1813 erp |= IEEE80211_ERP_USE_PROTECTION; 1814 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1815 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1816 *frm++ = erp; 1817 return frm; 1818 } 1819 1820 /* 1821 * Add a CFParams element to a frame. 1822 */ 1823 static uint8_t * 1824 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1825 { 1826 #define ADDSHORT(frm, v) do { \ 1827 le16enc(frm, v); \ 1828 frm += 2; \ 1829 } while (0) 1830 *frm++ = IEEE80211_ELEMID_CFPARMS; 1831 *frm++ = 6; 1832 *frm++ = 0; /* CFP count */ 1833 *frm++ = 2; /* CFP period */ 1834 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1835 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1836 return frm; 1837 #undef ADDSHORT 1838 } 1839 1840 static __inline uint8_t * 1841 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1842 { 1843 memcpy(frm, ie->ie_data, ie->ie_len); 1844 return frm + ie->ie_len; 1845 } 1846 1847 static __inline uint8_t * 1848 add_ie(uint8_t *frm, const uint8_t *ie) 1849 { 1850 memcpy(frm, ie, 2 + ie[1]); 1851 return frm + 2 + ie[1]; 1852 } 1853 1854 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1855 /* 1856 * Add a WME information element to a frame. 1857 */ 1858 uint8_t * 1859 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1860 { 1861 static const struct ieee80211_wme_info info = { 1862 .wme_id = IEEE80211_ELEMID_VENDOR, 1863 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1864 .wme_oui = { WME_OUI_BYTES }, 1865 .wme_type = WME_OUI_TYPE, 1866 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1867 .wme_version = WME_VERSION, 1868 .wme_info = 0, 1869 }; 1870 memcpy(frm, &info, sizeof(info)); 1871 return frm + sizeof(info); 1872 } 1873 1874 /* 1875 * Add a WME parameters element to a frame. 1876 */ 1877 static uint8_t * 1878 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1879 { 1880 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1881 #define ADDSHORT(frm, v) do { \ 1882 le16enc(frm, v); \ 1883 frm += 2; \ 1884 } while (0) 1885 /* NB: this works 'cuz a param has an info at the front */ 1886 static const struct ieee80211_wme_info param = { 1887 .wme_id = IEEE80211_ELEMID_VENDOR, 1888 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1889 .wme_oui = { WME_OUI_BYTES }, 1890 .wme_type = WME_OUI_TYPE, 1891 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1892 .wme_version = WME_VERSION, 1893 }; 1894 int i; 1895 1896 memcpy(frm, ¶m, sizeof(param)); 1897 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1898 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1899 *frm++ = 0; /* reserved field */ 1900 for (i = 0; i < WME_NUM_AC; i++) { 1901 const struct wmeParams *ac = 1902 &wme->wme_bssChanParams.cap_wmeParams[i]; 1903 *frm++ = SM(i, WME_PARAM_ACI) 1904 | SM(ac->wmep_acm, WME_PARAM_ACM) 1905 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1906 ; 1907 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1908 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1909 ; 1910 ADDSHORT(frm, ac->wmep_txopLimit); 1911 } 1912 return frm; 1913 #undef SM 1914 #undef ADDSHORT 1915 } 1916 #undef WME_OUI_BYTES 1917 1918 /* 1919 * Add an 11h Power Constraint element to a frame. 1920 */ 1921 static uint8_t * 1922 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1923 { 1924 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1925 /* XXX per-vap tx power limit? */ 1926 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1927 1928 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1929 frm[1] = 1; 1930 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1931 return frm + 3; 1932 } 1933 1934 /* 1935 * Add an 11h Power Capability element to a frame. 1936 */ 1937 static uint8_t * 1938 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1939 { 1940 frm[0] = IEEE80211_ELEMID_PWRCAP; 1941 frm[1] = 2; 1942 frm[2] = c->ic_minpower; 1943 frm[3] = c->ic_maxpower; 1944 return frm + 4; 1945 } 1946 1947 /* 1948 * Add an 11h Supported Channels element to a frame. 1949 */ 1950 static uint8_t * 1951 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1952 { 1953 static const int ielen = 26; 1954 1955 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1956 frm[1] = ielen; 1957 /* XXX not correct */ 1958 memcpy(frm+2, ic->ic_chan_avail, ielen); 1959 return frm + 2 + ielen; 1960 } 1961 1962 /* 1963 * Add an 11h Quiet time element to a frame. 1964 */ 1965 static uint8_t * 1966 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 1967 { 1968 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 1969 1970 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 1971 quiet->len = 6; 1972 if (vap->iv_quiet_count_value == 1) 1973 vap->iv_quiet_count_value = vap->iv_quiet_count; 1974 else if (vap->iv_quiet_count_value > 1) 1975 vap->iv_quiet_count_value--; 1976 1977 if (vap->iv_quiet_count_value == 0) { 1978 /* value 0 is reserved as per 802.11h standerd */ 1979 vap->iv_quiet_count_value = 1; 1980 } 1981 1982 quiet->tbttcount = vap->iv_quiet_count_value; 1983 quiet->period = vap->iv_quiet_period; 1984 quiet->duration = htole16(vap->iv_quiet_duration); 1985 quiet->offset = htole16(vap->iv_quiet_offset); 1986 return frm + sizeof(*quiet); 1987 } 1988 1989 /* 1990 * Add an 11h Channel Switch Announcement element to a frame. 1991 * Note that we use the per-vap CSA count to adjust the global 1992 * counter so we can use this routine to form probe response 1993 * frames and get the current count. 1994 */ 1995 static uint8_t * 1996 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1997 { 1998 struct ieee80211com *ic = vap->iv_ic; 1999 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 2000 2001 csa->csa_ie = IEEE80211_ELEMID_CSA; 2002 csa->csa_len = 3; 2003 csa->csa_mode = 1; /* XXX force quiet on channel */ 2004 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 2005 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 2006 return frm + sizeof(*csa); 2007 } 2008 2009 /* 2010 * Add an 11h country information element to a frame. 2011 */ 2012 static uint8_t * 2013 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 2014 { 2015 2016 if (ic->ic_countryie == NULL || 2017 ic->ic_countryie_chan != ic->ic_bsschan) { 2018 /* 2019 * Handle lazy construction of ie. This is done on 2020 * first use and after a channel change that requires 2021 * re-calculation. 2022 */ 2023 if (ic->ic_countryie != NULL) 2024 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 2025 ic->ic_countryie = ieee80211_alloc_countryie(ic); 2026 if (ic->ic_countryie == NULL) 2027 return frm; 2028 ic->ic_countryie_chan = ic->ic_bsschan; 2029 } 2030 return add_appie(frm, ic->ic_countryie); 2031 } 2032 2033 uint8_t * 2034 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap) 2035 { 2036 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) 2037 return (add_ie(frm, vap->iv_wpa_ie)); 2038 else { 2039 /* XXX else complain? */ 2040 return (frm); 2041 } 2042 } 2043 2044 uint8_t * 2045 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap) 2046 { 2047 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL) 2048 return (add_ie(frm, vap->iv_rsn_ie)); 2049 else { 2050 /* XXX else complain? */ 2051 return (frm); 2052 } 2053 } 2054 2055 uint8_t * 2056 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni) 2057 { 2058 if (ni->ni_flags & IEEE80211_NODE_QOS) { 2059 *frm++ = IEEE80211_ELEMID_QOS; 2060 *frm++ = 1; 2061 *frm++ = 0; 2062 } 2063 2064 return (frm); 2065 } 2066 2067 /* 2068 * Send a probe request frame with the specified ssid 2069 * and any optional information element data. 2070 */ 2071 int 2072 ieee80211_send_probereq(struct ieee80211_node *ni, 2073 const uint8_t sa[IEEE80211_ADDR_LEN], 2074 const uint8_t da[IEEE80211_ADDR_LEN], 2075 const uint8_t bssid[IEEE80211_ADDR_LEN], 2076 const uint8_t *ssid, size_t ssidlen) 2077 { 2078 struct ieee80211vap *vap = ni->ni_vap; 2079 struct ieee80211com *ic = ni->ni_ic; 2080 const struct ieee80211_txparam *tp; 2081 struct ieee80211_bpf_params params; 2082 const struct ieee80211_rateset *rs; 2083 struct mbuf *m; 2084 uint8_t *frm; 2085 int ret; 2086 2087 if (vap->iv_state == IEEE80211_S_CAC) { 2088 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 2089 "block %s frame in CAC state", "probe request"); 2090 vap->iv_stats.is_tx_badstate++; 2091 return EIO; /* XXX */ 2092 } 2093 2094 /* 2095 * Hold a reference on the node so it doesn't go away until after 2096 * the xmit is complete all the way in the driver. On error we 2097 * will remove our reference. 2098 */ 2099 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2100 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2101 __func__, __LINE__, 2102 ni, ether_sprintf(ni->ni_macaddr), 2103 ieee80211_node_refcnt(ni)+1); 2104 ieee80211_ref_node(ni); 2105 2106 /* 2107 * prreq frame format 2108 * [tlv] ssid 2109 * [tlv] supported rates 2110 * [tlv] RSN (optional) 2111 * [tlv] extended supported rates 2112 * [tlv] WPA (optional) 2113 * [tlv] user-specified ie's 2114 */ 2115 m = ieee80211_getmgtframe(&frm, 2116 ic->ic_headroom + sizeof(struct ieee80211_frame), 2117 2 + IEEE80211_NWID_LEN 2118 + 2 + IEEE80211_RATE_SIZE 2119 + sizeof(struct ieee80211_ie_wpa) 2120 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2121 + sizeof(struct ieee80211_ie_wpa) 2122 + (vap->iv_appie_probereq != NULL ? 2123 vap->iv_appie_probereq->ie_len : 0) 2124 ); 2125 if (m == NULL) { 2126 vap->iv_stats.is_tx_nobuf++; 2127 ieee80211_free_node(ni); 2128 return ENOMEM; 2129 } 2130 2131 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 2132 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 2133 frm = ieee80211_add_rates(frm, rs); 2134 frm = ieee80211_add_rsn(frm, vap); 2135 frm = ieee80211_add_xrates(frm, rs); 2136 frm = ieee80211_add_wpa(frm, vap); 2137 if (vap->iv_appie_probereq != NULL) 2138 frm = add_appie(frm, vap->iv_appie_probereq); 2139 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2140 2141 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 2142 ("leading space %zd", M_LEADINGSPACE(m))); 2143 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2144 if (m == NULL) { 2145 /* NB: cannot happen */ 2146 ieee80211_free_node(ni); 2147 return ENOMEM; 2148 } 2149 2150 IEEE80211_TX_LOCK(ic); 2151 ieee80211_send_setup(ni, m, 2152 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 2153 IEEE80211_NONQOS_TID, sa, da, bssid); 2154 /* XXX power management? */ 2155 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2156 2157 M_WME_SETAC(m, WME_AC_BE); 2158 2159 IEEE80211_NODE_STAT(ni, tx_probereq); 2160 IEEE80211_NODE_STAT(ni, tx_mgmt); 2161 2162 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2163 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 2164 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 2165 ssidlen, ssid); 2166 2167 memset(¶ms, 0, sizeof(params)); 2168 params.ibp_pri = M_WME_GETAC(m); 2169 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 2170 params.ibp_rate0 = tp->mgmtrate; 2171 if (IEEE80211_IS_MULTICAST(da)) { 2172 params.ibp_flags |= IEEE80211_BPF_NOACK; 2173 params.ibp_try0 = 1; 2174 } else 2175 params.ibp_try0 = tp->maxretry; 2176 params.ibp_power = ni->ni_txpower; 2177 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 2178 IEEE80211_TX_UNLOCK(ic); 2179 return (ret); 2180 } 2181 2182 /* 2183 * Calculate capability information for mgt frames. 2184 */ 2185 uint16_t 2186 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2187 { 2188 struct ieee80211com *ic = vap->iv_ic; 2189 uint16_t capinfo; 2190 2191 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2192 2193 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2194 capinfo = IEEE80211_CAPINFO_ESS; 2195 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2196 capinfo = IEEE80211_CAPINFO_IBSS; 2197 else 2198 capinfo = 0; 2199 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2200 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2201 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2202 IEEE80211_IS_CHAN_2GHZ(chan)) 2203 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2204 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2205 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2206 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2207 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2208 return capinfo; 2209 } 2210 2211 /* 2212 * Send a management frame. The node is for the destination (or ic_bss 2213 * when in station mode). Nodes other than ic_bss have their reference 2214 * count bumped to reflect our use for an indeterminant time. 2215 */ 2216 int 2217 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2218 { 2219 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2220 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2221 struct ieee80211vap *vap = ni->ni_vap; 2222 struct ieee80211com *ic = ni->ni_ic; 2223 struct ieee80211_node *bss = vap->iv_bss; 2224 struct ieee80211_bpf_params params; 2225 struct mbuf *m; 2226 uint8_t *frm; 2227 uint16_t capinfo; 2228 int has_challenge, is_shared_key, ret, status; 2229 2230 KASSERT(ni != NULL, ("null node")); 2231 2232 /* 2233 * Hold a reference on the node so it doesn't go away until after 2234 * the xmit is complete all the way in the driver. On error we 2235 * will remove our reference. 2236 */ 2237 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2238 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2239 __func__, __LINE__, 2240 ni, ether_sprintf(ni->ni_macaddr), 2241 ieee80211_node_refcnt(ni)+1); 2242 ieee80211_ref_node(ni); 2243 2244 memset(¶ms, 0, sizeof(params)); 2245 switch (type) { 2246 2247 case IEEE80211_FC0_SUBTYPE_AUTH: 2248 status = arg >> 16; 2249 arg &= 0xffff; 2250 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2251 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2252 ni->ni_challenge != NULL); 2253 2254 /* 2255 * Deduce whether we're doing open authentication or 2256 * shared key authentication. We do the latter if 2257 * we're in the middle of a shared key authentication 2258 * handshake or if we're initiating an authentication 2259 * request and configured to use shared key. 2260 */ 2261 is_shared_key = has_challenge || 2262 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2263 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2264 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2265 2266 m = ieee80211_getmgtframe(&frm, 2267 ic->ic_headroom + sizeof(struct ieee80211_frame), 2268 3 * sizeof(uint16_t) 2269 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2270 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2271 ); 2272 if (m == NULL) 2273 senderr(ENOMEM, is_tx_nobuf); 2274 2275 ((uint16_t *)frm)[0] = 2276 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2277 : htole16(IEEE80211_AUTH_ALG_OPEN); 2278 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2279 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2280 2281 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2282 ((uint16_t *)frm)[3] = 2283 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2284 IEEE80211_ELEMID_CHALLENGE); 2285 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2286 IEEE80211_CHALLENGE_LEN); 2287 m->m_pkthdr.len = m->m_len = 2288 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2289 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2290 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2291 "request encrypt frame (%s)", __func__); 2292 /* mark frame for encryption */ 2293 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2294 } 2295 } else 2296 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2297 2298 /* XXX not right for shared key */ 2299 if (status == IEEE80211_STATUS_SUCCESS) 2300 IEEE80211_NODE_STAT(ni, tx_auth); 2301 else 2302 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2303 2304 if (vap->iv_opmode == IEEE80211_M_STA) 2305 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2306 (void *) vap->iv_state); 2307 break; 2308 2309 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2310 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2311 "send station deauthenticate (reason: %d (%s))", arg, 2312 ieee80211_reason_to_string(arg)); 2313 m = ieee80211_getmgtframe(&frm, 2314 ic->ic_headroom + sizeof(struct ieee80211_frame), 2315 sizeof(uint16_t)); 2316 if (m == NULL) 2317 senderr(ENOMEM, is_tx_nobuf); 2318 *(uint16_t *)frm = htole16(arg); /* reason */ 2319 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2320 2321 IEEE80211_NODE_STAT(ni, tx_deauth); 2322 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2323 2324 ieee80211_node_unauthorize(ni); /* port closed */ 2325 break; 2326 2327 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2328 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2329 /* 2330 * asreq frame format 2331 * [2] capability information 2332 * [2] listen interval 2333 * [6*] current AP address (reassoc only) 2334 * [tlv] ssid 2335 * [tlv] supported rates 2336 * [tlv] extended supported rates 2337 * [4] power capability (optional) 2338 * [28] supported channels (optional) 2339 * [tlv] HT capabilities 2340 * [tlv] WME (optional) 2341 * [tlv] Vendor OUI HT capabilities (optional) 2342 * [tlv] Atheros capabilities (if negotiated) 2343 * [tlv] AppIE's (optional) 2344 */ 2345 m = ieee80211_getmgtframe(&frm, 2346 ic->ic_headroom + sizeof(struct ieee80211_frame), 2347 sizeof(uint16_t) 2348 + sizeof(uint16_t) 2349 + IEEE80211_ADDR_LEN 2350 + 2 + IEEE80211_NWID_LEN 2351 + 2 + IEEE80211_RATE_SIZE 2352 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2353 + 4 2354 + 2 + 26 2355 + sizeof(struct ieee80211_wme_info) 2356 + sizeof(struct ieee80211_ie_htcap) 2357 + 4 + sizeof(struct ieee80211_ie_htcap) 2358 #ifdef IEEE80211_SUPPORT_SUPERG 2359 + sizeof(struct ieee80211_ath_ie) 2360 #endif 2361 + (vap->iv_appie_wpa != NULL ? 2362 vap->iv_appie_wpa->ie_len : 0) 2363 + (vap->iv_appie_assocreq != NULL ? 2364 vap->iv_appie_assocreq->ie_len : 0) 2365 ); 2366 if (m == NULL) 2367 senderr(ENOMEM, is_tx_nobuf); 2368 2369 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2370 ("wrong mode %u", vap->iv_opmode)); 2371 capinfo = IEEE80211_CAPINFO_ESS; 2372 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2373 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2374 /* 2375 * NB: Some 11a AP's reject the request when 2376 * short premable is set. 2377 */ 2378 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2379 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2380 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2381 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2382 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2383 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2384 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2385 (vap->iv_flags & IEEE80211_F_DOTH)) 2386 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2387 *(uint16_t *)frm = htole16(capinfo); 2388 frm += 2; 2389 2390 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2391 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2392 bss->ni_intval)); 2393 frm += 2; 2394 2395 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2396 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2397 frm += IEEE80211_ADDR_LEN; 2398 } 2399 2400 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2401 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2402 frm = ieee80211_add_rsn(frm, vap); 2403 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2404 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2405 frm = ieee80211_add_powercapability(frm, 2406 ic->ic_curchan); 2407 frm = ieee80211_add_supportedchannels(frm, ic); 2408 } 2409 2410 /* 2411 * Check the channel - we may be using an 11n NIC with an 2412 * 11n capable station, but we're configured to be an 11b 2413 * channel. 2414 */ 2415 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2416 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2417 ni->ni_ies.htcap_ie != NULL && 2418 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) { 2419 frm = ieee80211_add_htcap(frm, ni); 2420 } 2421 frm = ieee80211_add_wpa(frm, vap); 2422 if ((ic->ic_flags & IEEE80211_F_WME) && 2423 ni->ni_ies.wme_ie != NULL) 2424 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2425 2426 /* 2427 * Same deal - only send HT info if we're on an 11n 2428 * capable channel. 2429 */ 2430 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2431 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2432 ni->ni_ies.htcap_ie != NULL && 2433 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) { 2434 frm = ieee80211_add_htcap_vendor(frm, ni); 2435 } 2436 #ifdef IEEE80211_SUPPORT_SUPERG 2437 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2438 frm = ieee80211_add_ath(frm, 2439 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2440 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2441 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2442 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2443 } 2444 #endif /* IEEE80211_SUPPORT_SUPERG */ 2445 if (vap->iv_appie_assocreq != NULL) 2446 frm = add_appie(frm, vap->iv_appie_assocreq); 2447 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2448 2449 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2450 (void *) vap->iv_state); 2451 break; 2452 2453 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2454 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2455 /* 2456 * asresp frame format 2457 * [2] capability information 2458 * [2] status 2459 * [2] association ID 2460 * [tlv] supported rates 2461 * [tlv] extended supported rates 2462 * [tlv] HT capabilities (standard, if STA enabled) 2463 * [tlv] HT information (standard, if STA enabled) 2464 * [tlv] WME (if configured and STA enabled) 2465 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2466 * [tlv] HT information (vendor OUI, if STA enabled) 2467 * [tlv] Atheros capabilities (if STA enabled) 2468 * [tlv] AppIE's (optional) 2469 */ 2470 m = ieee80211_getmgtframe(&frm, 2471 ic->ic_headroom + sizeof(struct ieee80211_frame), 2472 sizeof(uint16_t) 2473 + sizeof(uint16_t) 2474 + sizeof(uint16_t) 2475 + 2 + IEEE80211_RATE_SIZE 2476 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2477 + sizeof(struct ieee80211_ie_htcap) + 4 2478 + sizeof(struct ieee80211_ie_htinfo) + 4 2479 + sizeof(struct ieee80211_wme_param) 2480 #ifdef IEEE80211_SUPPORT_SUPERG 2481 + sizeof(struct ieee80211_ath_ie) 2482 #endif 2483 + (vap->iv_appie_assocresp != NULL ? 2484 vap->iv_appie_assocresp->ie_len : 0) 2485 ); 2486 if (m == NULL) 2487 senderr(ENOMEM, is_tx_nobuf); 2488 2489 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2490 *(uint16_t *)frm = htole16(capinfo); 2491 frm += 2; 2492 2493 *(uint16_t *)frm = htole16(arg); /* status */ 2494 frm += 2; 2495 2496 if (arg == IEEE80211_STATUS_SUCCESS) { 2497 *(uint16_t *)frm = htole16(ni->ni_associd); 2498 IEEE80211_NODE_STAT(ni, tx_assoc); 2499 } else 2500 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2501 frm += 2; 2502 2503 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2504 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2505 /* NB: respond according to what we received */ 2506 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2507 frm = ieee80211_add_htcap(frm, ni); 2508 frm = ieee80211_add_htinfo(frm, ni); 2509 } 2510 if ((vap->iv_flags & IEEE80211_F_WME) && 2511 ni->ni_ies.wme_ie != NULL) 2512 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2513 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2514 frm = ieee80211_add_htcap_vendor(frm, ni); 2515 frm = ieee80211_add_htinfo_vendor(frm, ni); 2516 } 2517 #ifdef IEEE80211_SUPPORT_SUPERG 2518 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2519 frm = ieee80211_add_ath(frm, 2520 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2521 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2522 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2523 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2524 #endif /* IEEE80211_SUPPORT_SUPERG */ 2525 if (vap->iv_appie_assocresp != NULL) 2526 frm = add_appie(frm, vap->iv_appie_assocresp); 2527 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2528 break; 2529 2530 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2531 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2532 "send station disassociate (reason: %d (%s))", arg, 2533 ieee80211_reason_to_string(arg)); 2534 m = ieee80211_getmgtframe(&frm, 2535 ic->ic_headroom + sizeof(struct ieee80211_frame), 2536 sizeof(uint16_t)); 2537 if (m == NULL) 2538 senderr(ENOMEM, is_tx_nobuf); 2539 *(uint16_t *)frm = htole16(arg); /* reason */ 2540 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2541 2542 IEEE80211_NODE_STAT(ni, tx_disassoc); 2543 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2544 break; 2545 2546 default: 2547 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2548 "invalid mgmt frame type %u", type); 2549 senderr(EINVAL, is_tx_unknownmgt); 2550 /* NOTREACHED */ 2551 } 2552 2553 /* NB: force non-ProbeResp frames to the highest queue */ 2554 params.ibp_pri = WME_AC_VO; 2555 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2556 /* NB: we know all frames are unicast */ 2557 params.ibp_try0 = bss->ni_txparms->maxretry; 2558 params.ibp_power = bss->ni_txpower; 2559 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2560 bad: 2561 ieee80211_free_node(ni); 2562 return ret; 2563 #undef senderr 2564 #undef HTFLAGS 2565 } 2566 2567 /* 2568 * Return an mbuf with a probe response frame in it. 2569 * Space is left to prepend and 802.11 header at the 2570 * front but it's left to the caller to fill in. 2571 */ 2572 struct mbuf * 2573 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2574 { 2575 struct ieee80211vap *vap = bss->ni_vap; 2576 struct ieee80211com *ic = bss->ni_ic; 2577 const struct ieee80211_rateset *rs; 2578 struct mbuf *m; 2579 uint16_t capinfo; 2580 uint8_t *frm; 2581 2582 /* 2583 * probe response frame format 2584 * [8] time stamp 2585 * [2] beacon interval 2586 * [2] cabability information 2587 * [tlv] ssid 2588 * [tlv] supported rates 2589 * [tlv] parameter set (FH/DS) 2590 * [tlv] parameter set (IBSS) 2591 * [tlv] country (optional) 2592 * [3] power control (optional) 2593 * [5] channel switch announcement (CSA) (optional) 2594 * [tlv] extended rate phy (ERP) 2595 * [tlv] extended supported rates 2596 * [tlv] RSN (optional) 2597 * [tlv] HT capabilities 2598 * [tlv] HT information 2599 * [tlv] WPA (optional) 2600 * [tlv] WME (optional) 2601 * [tlv] Vendor OUI HT capabilities (optional) 2602 * [tlv] Vendor OUI HT information (optional) 2603 * [tlv] Atheros capabilities 2604 * [tlv] AppIE's (optional) 2605 * [tlv] Mesh ID (MBSS) 2606 * [tlv] Mesh Conf (MBSS) 2607 */ 2608 m = ieee80211_getmgtframe(&frm, 2609 ic->ic_headroom + sizeof(struct ieee80211_frame), 2610 8 2611 + sizeof(uint16_t) 2612 + sizeof(uint16_t) 2613 + 2 + IEEE80211_NWID_LEN 2614 + 2 + IEEE80211_RATE_SIZE 2615 + 7 /* max(7,3) */ 2616 + IEEE80211_COUNTRY_MAX_SIZE 2617 + 3 2618 + sizeof(struct ieee80211_csa_ie) 2619 + sizeof(struct ieee80211_quiet_ie) 2620 + 3 2621 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2622 + sizeof(struct ieee80211_ie_wpa) 2623 + sizeof(struct ieee80211_ie_htcap) 2624 + sizeof(struct ieee80211_ie_htinfo) 2625 + sizeof(struct ieee80211_ie_wpa) 2626 + sizeof(struct ieee80211_wme_param) 2627 + 4 + sizeof(struct ieee80211_ie_htcap) 2628 + 4 + sizeof(struct ieee80211_ie_htinfo) 2629 #ifdef IEEE80211_SUPPORT_SUPERG 2630 + sizeof(struct ieee80211_ath_ie) 2631 #endif 2632 #ifdef IEEE80211_SUPPORT_MESH 2633 + 2 + IEEE80211_MESHID_LEN 2634 + sizeof(struct ieee80211_meshconf_ie) 2635 #endif 2636 + (vap->iv_appie_proberesp != NULL ? 2637 vap->iv_appie_proberesp->ie_len : 0) 2638 ); 2639 if (m == NULL) { 2640 vap->iv_stats.is_tx_nobuf++; 2641 return NULL; 2642 } 2643 2644 memset(frm, 0, 8); /* timestamp should be filled later */ 2645 frm += 8; 2646 *(uint16_t *)frm = htole16(bss->ni_intval); 2647 frm += 2; 2648 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2649 *(uint16_t *)frm = htole16(capinfo); 2650 frm += 2; 2651 2652 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2653 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2654 frm = ieee80211_add_rates(frm, rs); 2655 2656 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2657 *frm++ = IEEE80211_ELEMID_FHPARMS; 2658 *frm++ = 5; 2659 *frm++ = bss->ni_fhdwell & 0x00ff; 2660 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2661 *frm++ = IEEE80211_FH_CHANSET( 2662 ieee80211_chan2ieee(ic, bss->ni_chan)); 2663 *frm++ = IEEE80211_FH_CHANPAT( 2664 ieee80211_chan2ieee(ic, bss->ni_chan)); 2665 *frm++ = bss->ni_fhindex; 2666 } else { 2667 *frm++ = IEEE80211_ELEMID_DSPARMS; 2668 *frm++ = 1; 2669 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2670 } 2671 2672 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2673 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2674 *frm++ = 2; 2675 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2676 } 2677 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2678 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2679 frm = ieee80211_add_countryie(frm, ic); 2680 if (vap->iv_flags & IEEE80211_F_DOTH) { 2681 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2682 frm = ieee80211_add_powerconstraint(frm, vap); 2683 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2684 frm = ieee80211_add_csa(frm, vap); 2685 } 2686 if (vap->iv_flags & IEEE80211_F_DOTH) { 2687 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2688 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2689 if (vap->iv_quiet) 2690 frm = ieee80211_add_quiet(frm, vap); 2691 } 2692 } 2693 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2694 frm = ieee80211_add_erp(frm, ic); 2695 frm = ieee80211_add_xrates(frm, rs); 2696 frm = ieee80211_add_rsn(frm, vap); 2697 /* 2698 * NB: legacy 11b clients do not get certain ie's. 2699 * The caller identifies such clients by passing 2700 * a token in legacy to us. Could expand this to be 2701 * any legacy client for stuff like HT ie's. 2702 */ 2703 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2704 legacy != IEEE80211_SEND_LEGACY_11B) { 2705 frm = ieee80211_add_htcap(frm, bss); 2706 frm = ieee80211_add_htinfo(frm, bss); 2707 } 2708 frm = ieee80211_add_wpa(frm, vap); 2709 if (vap->iv_flags & IEEE80211_F_WME) 2710 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2711 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2712 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2713 legacy != IEEE80211_SEND_LEGACY_11B) { 2714 frm = ieee80211_add_htcap_vendor(frm, bss); 2715 frm = ieee80211_add_htinfo_vendor(frm, bss); 2716 } 2717 #ifdef IEEE80211_SUPPORT_SUPERG 2718 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2719 legacy != IEEE80211_SEND_LEGACY_11B) 2720 frm = ieee80211_add_athcaps(frm, bss); 2721 #endif 2722 if (vap->iv_appie_proberesp != NULL) 2723 frm = add_appie(frm, vap->iv_appie_proberesp); 2724 #ifdef IEEE80211_SUPPORT_MESH 2725 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2726 frm = ieee80211_add_meshid(frm, vap); 2727 frm = ieee80211_add_meshconf(frm, vap); 2728 } 2729 #endif 2730 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2731 2732 return m; 2733 } 2734 2735 /* 2736 * Send a probe response frame to the specified mac address. 2737 * This does not go through the normal mgt frame api so we 2738 * can specify the destination address and re-use the bss node 2739 * for the sta reference. 2740 */ 2741 int 2742 ieee80211_send_proberesp(struct ieee80211vap *vap, 2743 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2744 { 2745 struct ieee80211_node *bss = vap->iv_bss; 2746 struct ieee80211com *ic = vap->iv_ic; 2747 struct mbuf *m; 2748 int ret; 2749 2750 if (vap->iv_state == IEEE80211_S_CAC) { 2751 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2752 "block %s frame in CAC state", "probe response"); 2753 vap->iv_stats.is_tx_badstate++; 2754 return EIO; /* XXX */ 2755 } 2756 2757 /* 2758 * Hold a reference on the node so it doesn't go away until after 2759 * the xmit is complete all the way in the driver. On error we 2760 * will remove our reference. 2761 */ 2762 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2763 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2764 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2765 ieee80211_node_refcnt(bss)+1); 2766 ieee80211_ref_node(bss); 2767 2768 m = ieee80211_alloc_proberesp(bss, legacy); 2769 if (m == NULL) { 2770 ieee80211_free_node(bss); 2771 return ENOMEM; 2772 } 2773 2774 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2775 KASSERT(m != NULL, ("no room for header")); 2776 2777 IEEE80211_TX_LOCK(ic); 2778 ieee80211_send_setup(bss, m, 2779 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2780 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2781 /* XXX power management? */ 2782 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2783 2784 M_WME_SETAC(m, WME_AC_BE); 2785 2786 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2787 "send probe resp on channel %u to %s%s\n", 2788 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2789 legacy ? " <legacy>" : ""); 2790 IEEE80211_NODE_STAT(bss, tx_mgmt); 2791 2792 ret = ieee80211_raw_output(vap, bss, m, NULL); 2793 IEEE80211_TX_UNLOCK(ic); 2794 return (ret); 2795 } 2796 2797 /* 2798 * Allocate and build a RTS (Request To Send) control frame. 2799 */ 2800 struct mbuf * 2801 ieee80211_alloc_rts(struct ieee80211com *ic, 2802 const uint8_t ra[IEEE80211_ADDR_LEN], 2803 const uint8_t ta[IEEE80211_ADDR_LEN], 2804 uint16_t dur) 2805 { 2806 struct ieee80211_frame_rts *rts; 2807 struct mbuf *m; 2808 2809 /* XXX honor ic_headroom */ 2810 m = m_gethdr(M_NOWAIT, MT_DATA); 2811 if (m != NULL) { 2812 rts = mtod(m, struct ieee80211_frame_rts *); 2813 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2814 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2815 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2816 *(u_int16_t *)rts->i_dur = htole16(dur); 2817 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2818 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2819 2820 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2821 } 2822 return m; 2823 } 2824 2825 /* 2826 * Allocate and build a CTS (Clear To Send) control frame. 2827 */ 2828 struct mbuf * 2829 ieee80211_alloc_cts(struct ieee80211com *ic, 2830 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2831 { 2832 struct ieee80211_frame_cts *cts; 2833 struct mbuf *m; 2834 2835 /* XXX honor ic_headroom */ 2836 m = m_gethdr(M_NOWAIT, MT_DATA); 2837 if (m != NULL) { 2838 cts = mtod(m, struct ieee80211_frame_cts *); 2839 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2840 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2841 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2842 *(u_int16_t *)cts->i_dur = htole16(dur); 2843 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2844 2845 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2846 } 2847 return m; 2848 } 2849 2850 static void 2851 ieee80211_tx_mgt_timeout(void *arg) 2852 { 2853 struct ieee80211vap *vap = arg; 2854 2855 IEEE80211_LOCK(vap->iv_ic); 2856 if (vap->iv_state != IEEE80211_S_INIT && 2857 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2858 /* 2859 * NB: it's safe to specify a timeout as the reason here; 2860 * it'll only be used in the right state. 2861 */ 2862 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN, 2863 IEEE80211_SCAN_FAIL_TIMEOUT); 2864 } 2865 IEEE80211_UNLOCK(vap->iv_ic); 2866 } 2867 2868 /* 2869 * This is the callback set on net80211-sourced transmitted 2870 * authentication request frames. 2871 * 2872 * This does a couple of things: 2873 * 2874 * + If the frame transmitted was a success, it schedules a future 2875 * event which will transition the interface to scan. 2876 * If a state transition _then_ occurs before that event occurs, 2877 * said state transition will cancel this callout. 2878 * 2879 * + If the frame transmit was a failure, it immediately schedules 2880 * the transition back to scan. 2881 */ 2882 static void 2883 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2884 { 2885 struct ieee80211vap *vap = ni->ni_vap; 2886 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2887 2888 /* 2889 * Frame transmit completed; arrange timer callback. If 2890 * transmit was successfully we wait for response. Otherwise 2891 * we arrange an immediate callback instead of doing the 2892 * callback directly since we don't know what state the driver 2893 * is in (e.g. what locks it is holding). This work should 2894 * not be too time-critical and not happen too often so the 2895 * added overhead is acceptable. 2896 * 2897 * XXX what happens if !acked but response shows up before callback? 2898 */ 2899 if (vap->iv_state == ostate) { 2900 callout_reset(&vap->iv_mgtsend, 2901 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2902 ieee80211_tx_mgt_timeout, vap); 2903 } 2904 } 2905 2906 static void 2907 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2908 struct ieee80211_node *ni) 2909 { 2910 struct ieee80211vap *vap = ni->ni_vap; 2911 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 2912 struct ieee80211com *ic = ni->ni_ic; 2913 struct ieee80211_rateset *rs = &ni->ni_rates; 2914 uint16_t capinfo; 2915 2916 /* 2917 * beacon frame format 2918 * [8] time stamp 2919 * [2] beacon interval 2920 * [2] cabability information 2921 * [tlv] ssid 2922 * [tlv] supported rates 2923 * [3] parameter set (DS) 2924 * [8] CF parameter set (optional) 2925 * [tlv] parameter set (IBSS/TIM) 2926 * [tlv] country (optional) 2927 * [3] power control (optional) 2928 * [5] channel switch announcement (CSA) (optional) 2929 * [tlv] extended rate phy (ERP) 2930 * [tlv] extended supported rates 2931 * [tlv] RSN parameters 2932 * [tlv] HT capabilities 2933 * [tlv] HT information 2934 * XXX Vendor-specific OIDs (e.g. Atheros) 2935 * [tlv] WPA parameters 2936 * [tlv] WME parameters 2937 * [tlv] Vendor OUI HT capabilities (optional) 2938 * [tlv] Vendor OUI HT information (optional) 2939 * [tlv] Atheros capabilities (optional) 2940 * [tlv] TDMA parameters (optional) 2941 * [tlv] Mesh ID (MBSS) 2942 * [tlv] Mesh Conf (MBSS) 2943 * [tlv] application data (optional) 2944 */ 2945 2946 memset(bo, 0, sizeof(*bo)); 2947 2948 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2949 frm += 8; 2950 *(uint16_t *)frm = htole16(ni->ni_intval); 2951 frm += 2; 2952 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2953 bo->bo_caps = (uint16_t *)frm; 2954 *(uint16_t *)frm = htole16(capinfo); 2955 frm += 2; 2956 *frm++ = IEEE80211_ELEMID_SSID; 2957 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2958 *frm++ = ni->ni_esslen; 2959 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2960 frm += ni->ni_esslen; 2961 } else 2962 *frm++ = 0; 2963 frm = ieee80211_add_rates(frm, rs); 2964 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2965 *frm++ = IEEE80211_ELEMID_DSPARMS; 2966 *frm++ = 1; 2967 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2968 } 2969 if (ic->ic_flags & IEEE80211_F_PCF) { 2970 bo->bo_cfp = frm; 2971 frm = ieee80211_add_cfparms(frm, ic); 2972 } 2973 bo->bo_tim = frm; 2974 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2975 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2976 *frm++ = 2; 2977 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2978 bo->bo_tim_len = 0; 2979 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2980 vap->iv_opmode == IEEE80211_M_MBSS) { 2981 /* TIM IE is the same for Mesh and Hostap */ 2982 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2983 2984 tie->tim_ie = IEEE80211_ELEMID_TIM; 2985 tie->tim_len = 4; /* length */ 2986 tie->tim_count = 0; /* DTIM count */ 2987 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2988 tie->tim_bitctl = 0; /* bitmap control */ 2989 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2990 frm += sizeof(struct ieee80211_tim_ie); 2991 bo->bo_tim_len = 1; 2992 } 2993 bo->bo_tim_trailer = frm; 2994 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2995 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2996 frm = ieee80211_add_countryie(frm, ic); 2997 if (vap->iv_flags & IEEE80211_F_DOTH) { 2998 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2999 frm = ieee80211_add_powerconstraint(frm, vap); 3000 bo->bo_csa = frm; 3001 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 3002 frm = ieee80211_add_csa(frm, vap); 3003 } else 3004 bo->bo_csa = frm; 3005 3006 if (vap->iv_flags & IEEE80211_F_DOTH) { 3007 bo->bo_quiet = frm; 3008 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3009 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 3010 if (vap->iv_quiet) 3011 frm = ieee80211_add_quiet(frm,vap); 3012 } 3013 } else 3014 bo->bo_quiet = frm; 3015 3016 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 3017 bo->bo_erp = frm; 3018 frm = ieee80211_add_erp(frm, ic); 3019 } 3020 frm = ieee80211_add_xrates(frm, rs); 3021 frm = ieee80211_add_rsn(frm, vap); 3022 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 3023 frm = ieee80211_add_htcap(frm, ni); 3024 bo->bo_htinfo = frm; 3025 frm = ieee80211_add_htinfo(frm, ni); 3026 } 3027 frm = ieee80211_add_wpa(frm, vap); 3028 if (vap->iv_flags & IEEE80211_F_WME) { 3029 bo->bo_wme = frm; 3030 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 3031 } 3032 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 3033 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 3034 frm = ieee80211_add_htcap_vendor(frm, ni); 3035 frm = ieee80211_add_htinfo_vendor(frm, ni); 3036 } 3037 #ifdef IEEE80211_SUPPORT_SUPERG 3038 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 3039 bo->bo_ath = frm; 3040 frm = ieee80211_add_athcaps(frm, ni); 3041 } 3042 #endif 3043 #ifdef IEEE80211_SUPPORT_TDMA 3044 if (vap->iv_caps & IEEE80211_C_TDMA) { 3045 bo->bo_tdma = frm; 3046 frm = ieee80211_add_tdma(frm, vap); 3047 } 3048 #endif 3049 if (vap->iv_appie_beacon != NULL) { 3050 bo->bo_appie = frm; 3051 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 3052 frm = add_appie(frm, vap->iv_appie_beacon); 3053 } 3054 #ifdef IEEE80211_SUPPORT_MESH 3055 if (vap->iv_opmode == IEEE80211_M_MBSS) { 3056 frm = ieee80211_add_meshid(frm, vap); 3057 bo->bo_meshconf = frm; 3058 frm = ieee80211_add_meshconf(frm, vap); 3059 } 3060 #endif 3061 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 3062 bo->bo_csa_trailer_len = frm - bo->bo_csa; 3063 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 3064 } 3065 3066 /* 3067 * Allocate a beacon frame and fillin the appropriate bits. 3068 */ 3069 struct mbuf * 3070 ieee80211_beacon_alloc(struct ieee80211_node *ni) 3071 { 3072 struct ieee80211vap *vap = ni->ni_vap; 3073 struct ieee80211com *ic = ni->ni_ic; 3074 struct ifnet *ifp = vap->iv_ifp; 3075 struct ieee80211_frame *wh; 3076 struct mbuf *m; 3077 int pktlen; 3078 uint8_t *frm; 3079 3080 /* 3081 * beacon frame format 3082 * [8] time stamp 3083 * [2] beacon interval 3084 * [2] cabability information 3085 * [tlv] ssid 3086 * [tlv] supported rates 3087 * [3] parameter set (DS) 3088 * [8] CF parameter set (optional) 3089 * [tlv] parameter set (IBSS/TIM) 3090 * [tlv] country (optional) 3091 * [3] power control (optional) 3092 * [5] channel switch announcement (CSA) (optional) 3093 * [tlv] extended rate phy (ERP) 3094 * [tlv] extended supported rates 3095 * [tlv] RSN parameters 3096 * [tlv] HT capabilities 3097 * [tlv] HT information 3098 * [tlv] Vendor OUI HT capabilities (optional) 3099 * [tlv] Vendor OUI HT information (optional) 3100 * XXX Vendor-specific OIDs (e.g. Atheros) 3101 * [tlv] WPA parameters 3102 * [tlv] WME parameters 3103 * [tlv] TDMA parameters (optional) 3104 * [tlv] Mesh ID (MBSS) 3105 * [tlv] Mesh Conf (MBSS) 3106 * [tlv] application data (optional) 3107 * NB: we allocate the max space required for the TIM bitmap. 3108 * XXX how big is this? 3109 */ 3110 pktlen = 8 /* time stamp */ 3111 + sizeof(uint16_t) /* beacon interval */ 3112 + sizeof(uint16_t) /* capabilities */ 3113 + 2 + ni->ni_esslen /* ssid */ 3114 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 3115 + 2 + 1 /* DS parameters */ 3116 + 2 + 6 /* CF parameters */ 3117 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 3118 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 3119 + 2 + 1 /* power control */ 3120 + sizeof(struct ieee80211_csa_ie) /* CSA */ 3121 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 3122 + 2 + 1 /* ERP */ 3123 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 3124 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 3125 2*sizeof(struct ieee80211_ie_wpa) : 0) 3126 /* XXX conditional? */ 3127 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 3128 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 3129 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 3130 sizeof(struct ieee80211_wme_param) : 0) 3131 #ifdef IEEE80211_SUPPORT_SUPERG 3132 + sizeof(struct ieee80211_ath_ie) /* ATH */ 3133 #endif 3134 #ifdef IEEE80211_SUPPORT_TDMA 3135 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 3136 sizeof(struct ieee80211_tdma_param) : 0) 3137 #endif 3138 #ifdef IEEE80211_SUPPORT_MESH 3139 + 2 + ni->ni_meshidlen 3140 + sizeof(struct ieee80211_meshconf_ie) 3141 #endif 3142 + IEEE80211_MAX_APPIE 3143 ; 3144 m = ieee80211_getmgtframe(&frm, 3145 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 3146 if (m == NULL) { 3147 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 3148 "%s: cannot get buf; size %u\n", __func__, pktlen); 3149 vap->iv_stats.is_tx_nobuf++; 3150 return NULL; 3151 } 3152 ieee80211_beacon_construct(m, frm, ni); 3153 3154 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 3155 KASSERT(m != NULL, ("no space for 802.11 header?")); 3156 wh = mtod(m, struct ieee80211_frame *); 3157 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 3158 IEEE80211_FC0_SUBTYPE_BEACON; 3159 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 3160 *(uint16_t *)wh->i_dur = 0; 3161 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 3162 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 3163 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 3164 *(uint16_t *)wh->i_seq = 0; 3165 3166 return m; 3167 } 3168 3169 /* 3170 * Update the dynamic parts of a beacon frame based on the current state. 3171 */ 3172 int 3173 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast) 3174 { 3175 struct ieee80211vap *vap = ni->ni_vap; 3176 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 3177 struct ieee80211com *ic = ni->ni_ic; 3178 int len_changed = 0; 3179 uint16_t capinfo; 3180 struct ieee80211_frame *wh; 3181 ieee80211_seq seqno; 3182 3183 IEEE80211_LOCK(ic); 3184 /* 3185 * Handle 11h channel change when we've reached the count. 3186 * We must recalculate the beacon frame contents to account 3187 * for the new channel. Note we do this only for the first 3188 * vap that reaches this point; subsequent vaps just update 3189 * their beacon state to reflect the recalculated channel. 3190 */ 3191 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3192 vap->iv_csa_count == ic->ic_csa_count) { 3193 vap->iv_csa_count = 0; 3194 /* 3195 * Effect channel change before reconstructing the beacon 3196 * frame contents as many places reference ni_chan. 3197 */ 3198 if (ic->ic_csa_newchan != NULL) 3199 ieee80211_csa_completeswitch(ic); 3200 /* 3201 * NB: ieee80211_beacon_construct clears all pending 3202 * updates in bo_flags so we don't need to explicitly 3203 * clear IEEE80211_BEACON_CSA. 3204 */ 3205 ieee80211_beacon_construct(m, 3206 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni); 3207 3208 /* XXX do WME aggressive mode processing? */ 3209 IEEE80211_UNLOCK(ic); 3210 return 1; /* just assume length changed */ 3211 } 3212 3213 wh = mtod(m, struct ieee80211_frame *); 3214 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3215 *(uint16_t *)&wh->i_seq[0] = 3216 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3217 M_SEQNO_SET(m, seqno); 3218 3219 /* XXX faster to recalculate entirely or just changes? */ 3220 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3221 *bo->bo_caps = htole16(capinfo); 3222 3223 if (vap->iv_flags & IEEE80211_F_WME) { 3224 struct ieee80211_wme_state *wme = &ic->ic_wme; 3225 3226 /* 3227 * Check for aggressive mode change. When there is 3228 * significant high priority traffic in the BSS 3229 * throttle back BE traffic by using conservative 3230 * parameters. Otherwise BE uses aggressive params 3231 * to optimize performance of legacy/non-QoS traffic. 3232 */ 3233 if (wme->wme_flags & WME_F_AGGRMODE) { 3234 if (wme->wme_hipri_traffic > 3235 wme->wme_hipri_switch_thresh) { 3236 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3237 "%s: traffic %u, disable aggressive mode\n", 3238 __func__, wme->wme_hipri_traffic); 3239 wme->wme_flags &= ~WME_F_AGGRMODE; 3240 ieee80211_wme_updateparams_locked(vap); 3241 wme->wme_hipri_traffic = 3242 wme->wme_hipri_switch_hysteresis; 3243 } else 3244 wme->wme_hipri_traffic = 0; 3245 } else { 3246 if (wme->wme_hipri_traffic <= 3247 wme->wme_hipri_switch_thresh) { 3248 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3249 "%s: traffic %u, enable aggressive mode\n", 3250 __func__, wme->wme_hipri_traffic); 3251 wme->wme_flags |= WME_F_AGGRMODE; 3252 ieee80211_wme_updateparams_locked(vap); 3253 wme->wme_hipri_traffic = 0; 3254 } else 3255 wme->wme_hipri_traffic = 3256 wme->wme_hipri_switch_hysteresis; 3257 } 3258 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3259 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3260 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3261 } 3262 } 3263 3264 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3265 ieee80211_ht_update_beacon(vap, bo); 3266 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3267 } 3268 #ifdef IEEE80211_SUPPORT_TDMA 3269 if (vap->iv_caps & IEEE80211_C_TDMA) { 3270 /* 3271 * NB: the beacon is potentially updated every TBTT. 3272 */ 3273 ieee80211_tdma_update_beacon(vap, bo); 3274 } 3275 #endif 3276 #ifdef IEEE80211_SUPPORT_MESH 3277 if (vap->iv_opmode == IEEE80211_M_MBSS) 3278 ieee80211_mesh_update_beacon(vap, bo); 3279 #endif 3280 3281 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3282 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3283 struct ieee80211_tim_ie *tie = 3284 (struct ieee80211_tim_ie *) bo->bo_tim; 3285 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3286 u_int timlen, timoff, i; 3287 /* 3288 * ATIM/DTIM needs updating. If it fits in the 3289 * current space allocated then just copy in the 3290 * new bits. Otherwise we need to move any trailing 3291 * data to make room. Note that we know there is 3292 * contiguous space because ieee80211_beacon_allocate 3293 * insures there is space in the mbuf to write a 3294 * maximal-size virtual bitmap (based on iv_max_aid). 3295 */ 3296 /* 3297 * Calculate the bitmap size and offset, copy any 3298 * trailer out of the way, and then copy in the 3299 * new bitmap and update the information element. 3300 * Note that the tim bitmap must contain at least 3301 * one byte and any offset must be even. 3302 */ 3303 if (vap->iv_ps_pending != 0) { 3304 timoff = 128; /* impossibly large */ 3305 for (i = 0; i < vap->iv_tim_len; i++) 3306 if (vap->iv_tim_bitmap[i]) { 3307 timoff = i &~ 1; 3308 break; 3309 } 3310 KASSERT(timoff != 128, ("tim bitmap empty!")); 3311 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3312 if (vap->iv_tim_bitmap[i]) 3313 break; 3314 timlen = 1 + (i - timoff); 3315 } else { 3316 timoff = 0; 3317 timlen = 1; 3318 } 3319 if (timlen != bo->bo_tim_len) { 3320 /* copy up/down trailer */ 3321 int adjust = tie->tim_bitmap+timlen 3322 - bo->bo_tim_trailer; 3323 ovbcopy(bo->bo_tim_trailer, 3324 bo->bo_tim_trailer+adjust, 3325 bo->bo_tim_trailer_len); 3326 bo->bo_tim_trailer += adjust; 3327 bo->bo_erp += adjust; 3328 bo->bo_htinfo += adjust; 3329 #ifdef IEEE80211_SUPPORT_SUPERG 3330 bo->bo_ath += adjust; 3331 #endif 3332 #ifdef IEEE80211_SUPPORT_TDMA 3333 bo->bo_tdma += adjust; 3334 #endif 3335 #ifdef IEEE80211_SUPPORT_MESH 3336 bo->bo_meshconf += adjust; 3337 #endif 3338 bo->bo_appie += adjust; 3339 bo->bo_wme += adjust; 3340 bo->bo_csa += adjust; 3341 bo->bo_quiet += adjust; 3342 bo->bo_tim_len = timlen; 3343 3344 /* update information element */ 3345 tie->tim_len = 3 + timlen; 3346 tie->tim_bitctl = timoff; 3347 len_changed = 1; 3348 } 3349 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3350 bo->bo_tim_len); 3351 3352 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3353 3354 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3355 "%s: TIM updated, pending %u, off %u, len %u\n", 3356 __func__, vap->iv_ps_pending, timoff, timlen); 3357 } 3358 /* count down DTIM period */ 3359 if (tie->tim_count == 0) 3360 tie->tim_count = tie->tim_period - 1; 3361 else 3362 tie->tim_count--; 3363 /* update state for buffered multicast frames on DTIM */ 3364 if (mcast && tie->tim_count == 0) 3365 tie->tim_bitctl |= 1; 3366 else 3367 tie->tim_bitctl &= ~1; 3368 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3369 struct ieee80211_csa_ie *csa = 3370 (struct ieee80211_csa_ie *) bo->bo_csa; 3371 3372 /* 3373 * Insert or update CSA ie. If we're just starting 3374 * to count down to the channel switch then we need 3375 * to insert the CSA ie. Otherwise we just need to 3376 * drop the count. The actual change happens above 3377 * when the vap's count reaches the target count. 3378 */ 3379 if (vap->iv_csa_count == 0) { 3380 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3381 bo->bo_erp += sizeof(*csa); 3382 bo->bo_htinfo += sizeof(*csa); 3383 bo->bo_wme += sizeof(*csa); 3384 #ifdef IEEE80211_SUPPORT_SUPERG 3385 bo->bo_ath += sizeof(*csa); 3386 #endif 3387 #ifdef IEEE80211_SUPPORT_TDMA 3388 bo->bo_tdma += sizeof(*csa); 3389 #endif 3390 #ifdef IEEE80211_SUPPORT_MESH 3391 bo->bo_meshconf += sizeof(*csa); 3392 #endif 3393 bo->bo_appie += sizeof(*csa); 3394 bo->bo_csa_trailer_len += sizeof(*csa); 3395 bo->bo_quiet += sizeof(*csa); 3396 bo->bo_tim_trailer_len += sizeof(*csa); 3397 m->m_len += sizeof(*csa); 3398 m->m_pkthdr.len += sizeof(*csa); 3399 3400 ieee80211_add_csa(bo->bo_csa, vap); 3401 } else 3402 csa->csa_count--; 3403 vap->iv_csa_count++; 3404 /* NB: don't clear IEEE80211_BEACON_CSA */ 3405 } 3406 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3407 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3408 if (vap->iv_quiet) 3409 ieee80211_add_quiet(bo->bo_quiet, vap); 3410 } 3411 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3412 /* 3413 * ERP element needs updating. 3414 */ 3415 (void) ieee80211_add_erp(bo->bo_erp, ic); 3416 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3417 } 3418 #ifdef IEEE80211_SUPPORT_SUPERG 3419 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3420 ieee80211_add_athcaps(bo->bo_ath, ni); 3421 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3422 } 3423 #endif 3424 } 3425 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3426 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3427 int aielen; 3428 uint8_t *frm; 3429 3430 aielen = 0; 3431 if (aie != NULL) 3432 aielen += aie->ie_len; 3433 if (aielen != bo->bo_appie_len) { 3434 /* copy up/down trailer */ 3435 int adjust = aielen - bo->bo_appie_len; 3436 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3437 bo->bo_tim_trailer_len); 3438 bo->bo_tim_trailer += adjust; 3439 bo->bo_appie += adjust; 3440 bo->bo_appie_len = aielen; 3441 3442 len_changed = 1; 3443 } 3444 frm = bo->bo_appie; 3445 if (aie != NULL) 3446 frm = add_appie(frm, aie); 3447 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3448 } 3449 IEEE80211_UNLOCK(ic); 3450 3451 return len_changed; 3452 } 3453 3454 /* 3455 * Do Ethernet-LLC encapsulation for each payload in a fast frame 3456 * tunnel encapsulation. The frame is assumed to have an Ethernet 3457 * header at the front that must be stripped before prepending the 3458 * LLC followed by the Ethernet header passed in (with an Ethernet 3459 * type that specifies the payload size). 3460 */ 3461 struct mbuf * 3462 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 3463 const struct ether_header *eh) 3464 { 3465 struct llc *llc; 3466 uint16_t payload; 3467 3468 /* XXX optimize by combining m_adj+M_PREPEND */ 3469 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 3470 llc = mtod(m, struct llc *); 3471 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 3472 llc->llc_control = LLC_UI; 3473 llc->llc_snap.org_code[0] = 0; 3474 llc->llc_snap.org_code[1] = 0; 3475 llc->llc_snap.org_code[2] = 0; 3476 llc->llc_snap.ether_type = eh->ether_type; 3477 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 3478 3479 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 3480 if (m == NULL) { /* XXX cannot happen */ 3481 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 3482 "%s: no space for ether_header\n", __func__); 3483 vap->iv_stats.is_tx_nobuf++; 3484 return NULL; 3485 } 3486 ETHER_HEADER_COPY(mtod(m, void *), eh); 3487 mtod(m, struct ether_header *)->ether_type = htons(payload); 3488 return m; 3489 } 3490 3491 /* 3492 * Complete an mbuf transmission. 3493 * 3494 * For now, this simply processes a completed frame after the 3495 * driver has completed it's transmission and/or retransmission. 3496 * It assumes the frame is an 802.11 encapsulated frame. 3497 * 3498 * Later on it will grow to become the exit path for a given frame 3499 * from the driver and, depending upon how it's been encapsulated 3500 * and already transmitted, it may end up doing A-MPDU retransmission, 3501 * power save requeuing, etc. 3502 * 3503 * In order for the above to work, the driver entry point to this 3504 * must not hold any driver locks. Thus, the driver needs to delay 3505 * any actual mbuf completion until it can release said locks. 3506 * 3507 * This frees the mbuf and if the mbuf has a node reference, 3508 * the node reference will be freed. 3509 */ 3510 void 3511 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status) 3512 { 3513 3514 if (ni != NULL) { 3515 struct ifnet *ifp = ni->ni_vap->iv_ifp; 3516 3517 if (status == 0) { 3518 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 3519 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 3520 if (m->m_flags & M_MCAST) 3521 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 3522 } else 3523 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 3524 if (m->m_flags & M_TXCB) 3525 ieee80211_process_callback(ni, m, status); 3526 ieee80211_free_node(ni); 3527 } 3528 m_freem(m); 3529 } 3530