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/vlan/if_vlan_var.h> 50 51 #if defined(__DragonFly__) 52 #include <net/ifq_var.h> 53 #endif 54 55 #include <netproto/802_11/ieee80211_var.h> 56 #include <netproto/802_11/ieee80211_regdomain.h> 57 #ifdef IEEE80211_SUPPORT_SUPERG 58 #include <netproto/802_11/ieee80211_superg.h> 59 #endif 60 #ifdef IEEE80211_SUPPORT_TDMA 61 #include <netproto/802_11/ieee80211_tdma.h> 62 #endif 63 #include <netproto/802_11/ieee80211_wds.h> 64 #include <netproto/802_11/ieee80211_mesh.h> 65 66 #if defined(INET) || defined(INET6) 67 #include <netinet/in.h> 68 #endif 69 70 #ifdef INET 71 #include <netinet/if_ether.h> 72 #include <netinet/in_systm.h> 73 #include <netinet/ip.h> 74 #endif 75 #ifdef INET6 76 #include <netinet/ip6.h> 77 #endif 78 79 #if defined(__DragonFly__) 80 #else 81 #include <security/mac/mac_framework.h> 82 #endif 83 84 #define ETHER_HEADER_COPY(dst, src) \ 85 memcpy(dst, src, sizeof(struct ether_header)) 86 87 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 88 u_int hdrsize, u_int ciphdrsize, u_int mtu); 89 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 90 91 #ifdef IEEE80211_DEBUG 92 /* 93 * Decide if an outbound management frame should be 94 * printed when debugging is enabled. This filters some 95 * of the less interesting frames that come frequently 96 * (e.g. beacons). 97 */ 98 static __inline int 99 doprint(struct ieee80211vap *vap, int subtype) 100 { 101 switch (subtype) { 102 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 103 return (vap->iv_opmode == IEEE80211_M_IBSS); 104 } 105 return 1; 106 } 107 #endif 108 109 /* 110 * Transmit a frame to the given destination on the given VAP. 111 * 112 * It's up to the caller to figure out the details of who this 113 * is going to and resolving the node. 114 * 115 * This routine takes care of queuing it for power save, 116 * A-MPDU state stuff, fast-frames state stuff, encapsulation 117 * if required, then passing it up to the driver layer. 118 * 119 * This routine (for now) consumes the mbuf and frees the node 120 * reference; it ideally will return a TX status which reflects 121 * whether the mbuf was consumed or not, so the caller can 122 * free the mbuf (if appropriate) and the node reference (again, 123 * if appropriate.) 124 */ 125 int 126 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m, 127 struct ieee80211_node *ni) 128 { 129 struct ieee80211com *ic = vap->iv_ic; 130 struct ifnet *ifp = vap->iv_ifp; 131 int len, mcast; 132 133 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 134 (m->m_flags & M_PWR_SAV) == 0) { 135 /* 136 * Station in power save mode; pass the frame 137 * to the 802.11 layer and continue. We'll get 138 * the frame back when the time is right. 139 * XXX lose WDS vap linkage? 140 */ 141 if (ieee80211_pwrsave(ni, m) != 0) 142 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 143 ieee80211_free_node(ni); 144 145 /* 146 * We queued it fine, so tell the upper layer 147 * that we consumed it. 148 */ 149 return (0); 150 } 151 /* calculate priority so drivers can find the tx queue */ 152 if (ieee80211_classify(ni, m)) { 153 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 154 ni->ni_macaddr, NULL, 155 "%s", "classification failure"); 156 vap->iv_stats.is_tx_classify++; 157 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 158 m_freem(m); 159 ieee80211_free_node(ni); 160 161 /* XXX better status? */ 162 return (0); 163 } 164 /* 165 * Stash the node pointer. Note that we do this after 166 * any call to ieee80211_dwds_mcast because that code 167 * uses any existing value for rcvif to identify the 168 * interface it (might have been) received on. 169 */ 170 m->m_pkthdr.rcvif = (void *)ni; 171 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0; 172 len = m->m_pkthdr.len; 173 174 BPF_MTAP(ifp, m); /* 802.3 tx */ 175 176 /* 177 * Check if A-MPDU tx aggregation is setup or if we 178 * should try to enable it. The sta must be associated 179 * with HT and A-MPDU enabled for use. When the policy 180 * routine decides we should enable A-MPDU we issue an 181 * ADDBA request and wait for a reply. The frame being 182 * encapsulated will go out w/o using A-MPDU, or possibly 183 * it might be collected by the driver and held/retransmit. 184 * The default ic_ampdu_enable routine handles staggering 185 * ADDBA requests in case the receiver NAK's us or we are 186 * otherwise unable to establish a BA stream. 187 */ 188 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 189 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX)) { 190 if ((m->m_flags & M_EAPOL) == 0) { 191 int tid = WME_AC_TO_TID(M_WME_GETAC(m)); 192 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid]; 193 194 ieee80211_txampdu_count_packet(tap); 195 if (IEEE80211_AMPDU_RUNNING(tap)) { 196 /* 197 * Operational, mark frame for aggregation. 198 * 199 * XXX do tx aggregation here 200 */ 201 m->m_flags |= M_AMPDU_MPDU; 202 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 203 ic->ic_ampdu_enable(ni, tap)) { 204 /* 205 * Not negotiated yet, request service. 206 */ 207 ieee80211_ampdu_request(ni, tap); 208 /* XXX hold frame for reply? */ 209 } 210 } 211 } 212 213 #ifdef IEEE80211_SUPPORT_SUPERG 214 /* 215 * Check for AMSDU/FF; queue for aggregation 216 * 217 * Note: we don't bother trying to do fast frames or 218 * A-MSDU encapsulation for 802.3 drivers. Now, we 219 * likely could do it for FF (because it's a magic 220 * atheros tunnel LLC type) but I don't think we're going 221 * to really need to. For A-MSDU we'd have to set the 222 * A-MSDU QoS bit in the wifi header, so we just plain 223 * can't do it. 224 * 225 * Strictly speaking, we could actually /do/ A-MSDU / FF 226 * with A-MPDU together which for certain circumstances 227 * is beneficial (eg A-MSDU of TCK ACKs.) However, 228 * I'll ignore that for now so existing behaviour is maintained. 229 * Later on it would be good to make "amsdu + ampdu" configurable. 230 */ 231 else if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 232 if ((! mcast) && ieee80211_amsdu_tx_ok(ni)) { 233 m = ieee80211_amsdu_check(ni, m); 234 if (m == NULL) { 235 /* NB: any ni ref held on stageq */ 236 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 237 "%s: amsdu_check queued frame\n", 238 __func__); 239 return (0); 240 } 241 } else if ((! mcast) && IEEE80211_ATH_CAP(vap, ni, 242 IEEE80211_NODE_FF)) { 243 m = ieee80211_ff_check(ni, m); 244 if (m == NULL) { 245 /* NB: any ni ref held on stageq */ 246 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 247 "%s: ff_check queued frame\n", 248 __func__); 249 return (0); 250 } 251 } 252 } 253 #endif /* IEEE80211_SUPPORT_SUPERG */ 254 255 /* 256 * Grab the TX lock - serialise the TX process from this 257 * point (where TX state is being checked/modified) 258 * through to driver queue. 259 */ 260 IEEE80211_TX_LOCK(ic); 261 262 /* 263 * XXX make the encap and transmit code a separate function 264 * so things like the FF (and later A-MSDU) path can just call 265 * it for flushed frames. 266 */ 267 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 268 /* 269 * Encapsulate the packet in prep for transmission. 270 */ 271 m = ieee80211_encap(vap, ni, m); 272 if (m == NULL) { 273 /* NB: stat+msg handled in ieee80211_encap */ 274 IEEE80211_TX_UNLOCK(ic); 275 ieee80211_free_node(ni); 276 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 277 return (ENOBUFS); 278 } 279 } 280 /* HACK - added by DragonFly, mbuf could lose rcvif assignment above */ 281 m->m_pkthdr.rcvif = (void *)ni; 282 (void) ieee80211_parent_xmitpkt(ic, m); 283 284 /* 285 * Unlock at this point - no need to hold it across 286 * ieee80211_free_node() (ie, the comlock) 287 */ 288 IEEE80211_TX_UNLOCK(ic); 289 ic->ic_lastdata = ticks; 290 291 return (0); 292 } 293 294 295 296 /* 297 * Send the given mbuf through the given vap. 298 * 299 * This consumes the mbuf regardless of whether the transmit 300 * was successful or not. 301 * 302 * This does none of the initial checks that ieee80211_start() 303 * does (eg CAC timeout, interface wakeup) - the caller must 304 * do this first. 305 */ 306 static int 307 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m) 308 { 309 #define IS_DWDS(vap) \ 310 (vap->iv_opmode == IEEE80211_M_WDS && \ 311 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 312 struct ieee80211com *ic = vap->iv_ic; 313 struct ifnet *ifp = vap->iv_ifp; 314 struct ieee80211_node *ni; 315 struct ether_header *eh; 316 317 /* 318 * Cancel any background scan. 319 */ 320 if (ic->ic_flags & IEEE80211_F_SCAN) 321 ieee80211_cancel_anyscan(vap); 322 /* 323 * Find the node for the destination so we can do 324 * things like power save and fast frames aggregation. 325 * 326 * NB: past this point various code assumes the first 327 * mbuf has the 802.3 header present (and contiguous). 328 */ 329 ni = NULL; 330 if (m->m_len < sizeof(struct ether_header) && 331 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 332 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 333 "discard frame, %s\n", "m_pullup failed"); 334 vap->iv_stats.is_tx_nobuf++; /* XXX */ 335 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 336 return (ENOBUFS); 337 } 338 eh = mtod(m, struct ether_header *); 339 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 340 if (IS_DWDS(vap)) { 341 /* 342 * Only unicast frames from the above go out 343 * DWDS vaps; multicast frames are handled by 344 * dispatching the frame as it comes through 345 * the AP vap (see below). 346 */ 347 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 348 eh->ether_dhost, "mcast", "%s", "on DWDS"); 349 vap->iv_stats.is_dwds_mcast++; 350 m_freem(m); 351 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 352 /* XXX better status? */ 353 return (ENOBUFS); 354 } 355 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 356 /* 357 * Spam DWDS vap's w/ multicast traffic. 358 */ 359 /* XXX only if dwds in use? */ 360 ieee80211_dwds_mcast(vap, m); 361 } 362 } 363 #ifdef IEEE80211_SUPPORT_MESH 364 if (vap->iv_opmode != IEEE80211_M_MBSS) { 365 #endif 366 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 367 if (ni == NULL) { 368 /* NB: ieee80211_find_txnode does stat+msg */ 369 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 370 m_freem(m); 371 /* XXX better status? */ 372 return (ENOBUFS); 373 } 374 if (ni->ni_associd == 0 && 375 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 376 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 377 eh->ether_dhost, NULL, 378 "sta not associated (type 0x%04x)", 379 htons(eh->ether_type)); 380 vap->iv_stats.is_tx_notassoc++; 381 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 382 m_freem(m); 383 ieee80211_free_node(ni); 384 /* XXX better status? */ 385 return (ENOBUFS); 386 } 387 #ifdef IEEE80211_SUPPORT_MESH 388 } else { 389 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 390 /* 391 * Proxy station only if configured. 392 */ 393 if (!ieee80211_mesh_isproxyena(vap)) { 394 IEEE80211_DISCARD_MAC(vap, 395 IEEE80211_MSG_OUTPUT | 396 IEEE80211_MSG_MESH, 397 eh->ether_dhost, NULL, 398 "%s", "proxy not enabled"); 399 vap->iv_stats.is_mesh_notproxy++; 400 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 401 m_freem(m); 402 /* XXX better status? */ 403 return (ENOBUFS); 404 } 405 #if defined(__DragonFly__) 406 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 407 "forward frame from DS SA(%s), DA(%s)\n", 408 ether_sprintf(eh->ether_shost), 409 ether_sprintf(eh->ether_dhost)); 410 #else 411 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 412 "forward frame from DS SA(%6D), DA(%6D)\n", 413 eh->ether_shost, ":", 414 eh->ether_dhost, ":"); 415 #endif 416 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 417 } 418 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 419 if (ni == NULL) { 420 /* 421 * NB: ieee80211_mesh_discover holds/disposes 422 * frame (e.g. queueing on path discovery). 423 */ 424 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 425 /* XXX better status? */ 426 return (ENOBUFS); 427 } 428 } 429 #endif 430 431 /* 432 * We've resolved the sender, so attempt to transmit it. 433 */ 434 435 if (vap->iv_state == IEEE80211_S_SLEEP) { 436 /* 437 * In power save; queue frame and then wakeup device 438 * for transmit. 439 */ 440 ic->ic_lastdata = ticks; 441 if (ieee80211_pwrsave(ni, m) != 0) 442 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 443 ieee80211_free_node(ni); 444 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 445 return (0); 446 } 447 448 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0) 449 return (ENOBUFS); 450 return (0); 451 #undef IS_DWDS 452 } 453 454 /* 455 * Start method for vap's. All packets from the stack come 456 * through here. We handle common processing of the packets 457 * before dispatching them to the underlying device. 458 * 459 * if_transmit() requires that the mbuf be consumed by this call 460 * regardless of the return condition. 461 */ 462 463 #if defined(__DragonFly__) 464 465 void 466 ieee80211_vap_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 467 { 468 struct ieee80211vap *vap = ifp->if_softc; 469 struct ieee80211com *ic = vap->iv_ic; 470 struct ifnet *parent = vap->iv_ifp; 471 struct mbuf *m = NULL; 472 473 /* NB: parent must be up and running */ 474 if (!IFNET_IS_UP_RUNNING(parent)) { 475 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 476 "%s: ignore queue, parent %s not up+running\n", 477 __func__, parent->if_xname); 478 /* XXX stat */ 479 /*m_freem(m);*/ 480 /*return (EINVAL);*/ 481 return; 482 } 483 484 wlan_assert_serialized(); 485 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 486 487 /* 488 * No data frames go out unless we're running. 489 * Note in particular this covers CAC and CSA 490 * states (though maybe we should check muting 491 * for CSA). 492 */ 493 if (vap->iv_state != IEEE80211_S_RUN && 494 vap->iv_state != IEEE80211_S_SLEEP) { 495 IEEE80211_LOCK(ic); 496 /* re-check under the com lock to avoid races */ 497 if (vap->iv_state != IEEE80211_S_RUN && 498 vap->iv_state != IEEE80211_S_SLEEP) { 499 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 500 "%s: ignore queue, in %s state\n", 501 __func__, ieee80211_state_name[vap->iv_state]); 502 vap->iv_stats.is_tx_badstate++; 503 IEEE80211_UNLOCK(ic); 504 ifsq_set_oactive(ifsq); 505 /*m_freem(m);*/ 506 /* return (EINVAL); */ 507 return; 508 } 509 IEEE80211_UNLOCK(ic); 510 } 511 512 wlan_serialize_exit(); 513 for (;;) { 514 m = ifsq_dequeue(ifsq); 515 if (m == NULL) 516 break; 517 518 /* 519 * Sanitize mbuf flags for net80211 use. We cannot 520 * clear M_PWR_SAV or M_MORE_DATA because these may 521 * be set for frames that are re-submitted from the 522 * power save queue. 523 * 524 * NB: This must be done before ieee80211_classify as 525 * it marks EAPOL in frames with M_EAPOL. 526 */ 527 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 528 529 /* 530 * Bump to the packet transmission path. 531 * The mbuf will be consumed here. 532 */ 533 ieee80211_start_pkt(vap, m); 534 } 535 wlan_serialize_enter(); 536 } 537 538 #else 539 540 int 541 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m) 542 { 543 struct ieee80211vap *vap = ifp->if_softc; 544 struct ieee80211com *ic = vap->iv_ic; 545 546 /* 547 * No data frames go out unless we're running. 548 * Note in particular this covers CAC and CSA 549 * states (though maybe we should check muting 550 * for CSA). 551 */ 552 if (vap->iv_state != IEEE80211_S_RUN && 553 vap->iv_state != IEEE80211_S_SLEEP) { 554 IEEE80211_LOCK(ic); 555 /* re-check under the com lock to avoid races */ 556 if (vap->iv_state != IEEE80211_S_RUN && 557 vap->iv_state != IEEE80211_S_SLEEP) { 558 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 559 "%s: ignore queue, in %s state\n", 560 __func__, ieee80211_state_name[vap->iv_state]); 561 vap->iv_stats.is_tx_badstate++; 562 IEEE80211_UNLOCK(ic); 563 ifp->if_drv_flags |= IFF_DRV_OACTIVE; 564 m_freem(m); 565 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 566 return (ENETDOWN); 567 } 568 IEEE80211_UNLOCK(ic); 569 } 570 571 /* 572 * Sanitize mbuf flags for net80211 use. We cannot 573 * clear M_PWR_SAV or M_MORE_DATA because these may 574 * be set for frames that are re-submitted from the 575 * power save queue. 576 * 577 * NB: This must be done before ieee80211_classify as 578 * it marks EAPOL in frames with M_EAPOL. 579 */ 580 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 581 582 /* 583 * Bump to the packet transmission path. 584 * The mbuf will be consumed here. 585 */ 586 return (ieee80211_start_pkt(vap, m)); 587 } 588 589 void 590 ieee80211_vap_qflush(struct ifnet *ifp) 591 { 592 593 /* Empty for now */ 594 } 595 596 #endif 597 598 /* 599 * 802.11 raw output routine. 600 * 601 * XXX TODO: this (and other send routines) should correctly 602 * XXX keep the pwr mgmt bit set if it decides to call into the 603 * XXX driver to send a frame whilst the state is SLEEP. 604 * 605 * Otherwise the peer may decide that we're awake and flood us 606 * with traffic we are still too asleep to receive! 607 */ 608 int 609 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni, 610 struct mbuf *m, const struct ieee80211_bpf_params *params) 611 { 612 struct ieee80211com *ic = vap->iv_ic; 613 int error; 614 615 /* 616 * Set node - the caller has taken a reference, so ensure 617 * that the mbuf has the same node value that 618 * it would if it were going via the normal path. 619 */ 620 m->m_pkthdr.rcvif = (void *)ni; 621 622 /* 623 * Attempt to add bpf transmit parameters. 624 * 625 * For now it's ok to fail; the raw_xmit api still takes 626 * them as an option. 627 * 628 * Later on when ic_raw_xmit() has params removed, 629 * they'll have to be added - so fail the transmit if 630 * they can't be. 631 */ 632 if (params) 633 (void) ieee80211_add_xmit_params(m, params); 634 635 error = ic->ic_raw_xmit(ni, m, params); 636 if (error) { 637 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1); 638 ieee80211_free_node(ni); 639 } 640 return (error); 641 } 642 643 /* 644 * 802.11 output routine. This is (currently) used only to 645 * connect bpf write calls to the 802.11 layer for injecting 646 * raw 802.11 frames. 647 */ 648 #if defined(__DragonFly__) 649 int 650 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 651 struct sockaddr *dst, struct rtentry *rt) 652 #else 653 int 654 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 655 const struct sockaddr *dst, struct route *ro) 656 #endif 657 { 658 #define senderr(e) do { error = (e); goto bad;} while (0) 659 struct ieee80211_node *ni = NULL; 660 struct ieee80211vap *vap; 661 struct ieee80211_frame *wh; 662 struct ieee80211com *ic = NULL; 663 int error; 664 int ret; 665 666 #if defined(__DragonFly__) 667 struct ifaltq_subque *ifsq; 668 ifsq = ifq_get_subq_default(&ifp->if_snd); 669 if (ifsq_is_oactive(ifsq)) { 670 #else 671 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) { 672 #endif 673 /* 674 * Short-circuit requests if the vap is marked OACTIVE 675 * as this can happen because a packet came down through 676 * ieee80211_start before the vap entered RUN state in 677 * which case it's ok to just drop the frame. This 678 * should not be necessary but callers of if_output don't 679 * check OACTIVE. 680 */ 681 senderr(ENETDOWN); 682 } 683 vap = ifp->if_softc; 684 ic = vap->iv_ic; 685 /* 686 * Hand to the 802.3 code if not tagged as 687 * a raw 802.11 frame. 688 */ 689 #if defined(__DragonFly__) 690 if (dst->sa_family != AF_IEEE80211) 691 return vap->iv_output(ifp, m, dst, rt); 692 #else 693 if (dst->sa_family != AF_IEEE80211) 694 return vap->iv_output(ifp, m, dst, ro); 695 #endif 696 #ifdef MAC 697 error = mac_ifnet_check_transmit(ifp, m); 698 if (error) 699 senderr(error); 700 #endif 701 if (ifp->if_flags & IFF_MONITOR) 702 senderr(ENETDOWN); 703 if (!IFNET_IS_UP_RUNNING(ifp)) 704 senderr(ENETDOWN); 705 if (vap->iv_state == IEEE80211_S_CAC) { 706 IEEE80211_DPRINTF(vap, 707 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 708 "block %s frame in CAC state\n", "raw data"); 709 vap->iv_stats.is_tx_badstate++; 710 senderr(EIO); /* XXX */ 711 } else if (vap->iv_state == IEEE80211_S_SCAN) 712 senderr(EIO); 713 /* XXX bypass bridge, pfil, carp, etc. */ 714 715 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 716 senderr(EIO); /* XXX */ 717 wh = mtod(m, struct ieee80211_frame *); 718 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 719 IEEE80211_FC0_VERSION_0) 720 senderr(EIO); /* XXX */ 721 722 /* locate destination node */ 723 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 724 case IEEE80211_FC1_DIR_NODS: 725 case IEEE80211_FC1_DIR_FROMDS: 726 ni = ieee80211_find_txnode(vap, wh->i_addr1); 727 break; 728 case IEEE80211_FC1_DIR_TODS: 729 case IEEE80211_FC1_DIR_DSTODS: 730 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 731 senderr(EIO); /* XXX */ 732 ni = ieee80211_find_txnode(vap, wh->i_addr3); 733 break; 734 default: 735 senderr(EIO); /* XXX */ 736 } 737 if (ni == NULL) { 738 /* 739 * Permit packets w/ bpf params through regardless 740 * (see below about sa_len). 741 */ 742 if (dst->sa_len == 0) 743 senderr(EHOSTUNREACH); 744 ni = ieee80211_ref_node(vap->iv_bss); 745 } 746 747 /* 748 * Sanitize mbuf for net80211 flags leaked from above. 749 * 750 * NB: This must be done before ieee80211_classify as 751 * it marks EAPOL in frames with M_EAPOL. 752 */ 753 m->m_flags &= ~M_80211_TX; 754 755 /* calculate priority so drivers can find the tx queue */ 756 /* XXX assumes an 802.3 frame */ 757 if (ieee80211_classify(ni, m)) 758 senderr(EIO); /* XXX */ 759 760 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 761 IEEE80211_NODE_STAT(ni, tx_data); 762 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 763 IEEE80211_NODE_STAT(ni, tx_mcast); 764 m->m_flags |= M_MCAST; 765 } else 766 IEEE80211_NODE_STAT(ni, tx_ucast); 767 /* NB: ieee80211_encap does not include 802.11 header */ 768 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 769 770 IEEE80211_TX_LOCK(ic); 771 772 /* 773 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 774 * present by setting the sa_len field of the sockaddr (yes, 775 * this is a hack). 776 * NB: we assume sa_data is suitably aligned to cast. 777 */ 778 ret = ieee80211_raw_output(vap, ni, m, 779 (const struct ieee80211_bpf_params *)(dst->sa_len ? 780 dst->sa_data : NULL)); 781 IEEE80211_TX_UNLOCK(ic); 782 return (ret); 783 bad: 784 if (m != NULL) 785 m_freem(m); 786 if (ni != NULL) 787 ieee80211_free_node(ni); 788 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 789 return error; 790 #undef senderr 791 } 792 793 /* 794 * Set the direction field and address fields of an outgoing 795 * frame. Note this should be called early on in constructing 796 * a frame as it sets i_fc[1]; other bits can then be or'd in. 797 */ 798 void 799 ieee80211_send_setup( 800 struct ieee80211_node *ni, 801 struct mbuf *m, 802 int type, int tid, 803 const uint8_t sa[IEEE80211_ADDR_LEN], 804 const uint8_t da[IEEE80211_ADDR_LEN], 805 const uint8_t bssid[IEEE80211_ADDR_LEN]) 806 { 807 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 808 struct ieee80211vap *vap = ni->ni_vap; 809 struct ieee80211_tx_ampdu *tap; 810 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 811 ieee80211_seq seqno; 812 813 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic); 814 815 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 816 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 817 switch (vap->iv_opmode) { 818 case IEEE80211_M_STA: 819 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 820 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 821 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 822 IEEE80211_ADDR_COPY(wh->i_addr3, da); 823 break; 824 case IEEE80211_M_IBSS: 825 case IEEE80211_M_AHDEMO: 826 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 827 IEEE80211_ADDR_COPY(wh->i_addr1, da); 828 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 829 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 830 break; 831 case IEEE80211_M_HOSTAP: 832 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 833 IEEE80211_ADDR_COPY(wh->i_addr1, da); 834 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 835 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 836 break; 837 case IEEE80211_M_WDS: 838 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 839 IEEE80211_ADDR_COPY(wh->i_addr1, da); 840 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 841 IEEE80211_ADDR_COPY(wh->i_addr3, da); 842 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 843 break; 844 case IEEE80211_M_MBSS: 845 #ifdef IEEE80211_SUPPORT_MESH 846 if (IEEE80211_IS_MULTICAST(da)) { 847 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 848 /* XXX next hop */ 849 IEEE80211_ADDR_COPY(wh->i_addr1, da); 850 IEEE80211_ADDR_COPY(wh->i_addr2, 851 vap->iv_myaddr); 852 } else { 853 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 854 IEEE80211_ADDR_COPY(wh->i_addr1, da); 855 IEEE80211_ADDR_COPY(wh->i_addr2, 856 vap->iv_myaddr); 857 IEEE80211_ADDR_COPY(wh->i_addr3, da); 858 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 859 } 860 #endif 861 break; 862 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 863 break; 864 } 865 } else { 866 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 867 IEEE80211_ADDR_COPY(wh->i_addr1, da); 868 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 869 #ifdef IEEE80211_SUPPORT_MESH 870 if (vap->iv_opmode == IEEE80211_M_MBSS) 871 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 872 else 873 #endif 874 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 875 } 876 *(uint16_t *)&wh->i_dur[0] = 0; 877 878 tap = &ni->ni_tx_ampdu[tid]; 879 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap)) 880 m->m_flags |= M_AMPDU_MPDU; 881 else { 882 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK, 883 type & IEEE80211_FC0_SUBTYPE_MASK)) 884 seqno = ni->ni_txseqs[tid]++; 885 else 886 seqno = 0; 887 888 *(uint16_t *)&wh->i_seq[0] = 889 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 890 M_SEQNO_SET(m, seqno); 891 } 892 893 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 894 m->m_flags |= M_MCAST; 895 #undef WH4 896 } 897 898 /* 899 * Send a management frame to the specified node. The node pointer 900 * must have a reference as the pointer will be passed to the driver 901 * and potentially held for a long time. If the frame is successfully 902 * dispatched to the driver, then it is responsible forkfreeing the 903 * reference (and potentiallykfree'ing up any associated storage); 904 * otherwise deal with reclaiming any reference (on error). 905 */ 906 int 907 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 908 struct ieee80211_bpf_params *params) 909 { 910 struct ieee80211vap *vap = ni->ni_vap; 911 struct ieee80211com *ic = ni->ni_ic; 912 struct ieee80211_frame *wh; 913 int ret; 914 915 KASSERT(ni != NULL, ("null node")); 916 917 if (vap->iv_state == IEEE80211_S_CAC) { 918 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 919 ni, "block %s frame in CAC state", 920 ieee80211_mgt_subtype_name(type)); 921 vap->iv_stats.is_tx_badstate++; 922 ieee80211_free_node(ni); 923 m_freem(m); 924 return EIO; /* XXX */ 925 } 926 927 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 928 if (m == NULL) { 929 ieee80211_free_node(ni); 930 return ENOMEM; 931 } 932 933 IEEE80211_TX_LOCK(ic); 934 935 wh = mtod(m, struct ieee80211_frame *); 936 ieee80211_send_setup(ni, m, 937 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 938 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 939 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 940 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 941 "encrypting frame (%s)", __func__); 942 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 943 } 944 m->m_flags |= M_ENCAP; /* mark encapsulated */ 945 946 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 947 M_WME_SETAC(m, params->ibp_pri); 948 949 #ifdef IEEE80211_DEBUG 950 /* avoid printing too many frames */ 951 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 952 ieee80211_msg_dumppkts(vap)) { 953 kprintf("[%s] send %s on channel %u\n", 954 ether_sprintf(wh->i_addr1), 955 ieee80211_mgt_subtype_name(type), 956 ieee80211_chan2ieee(ic, ic->ic_curchan)); 957 } 958 #endif 959 IEEE80211_NODE_STAT(ni, tx_mgmt); 960 961 ret = ieee80211_raw_output(vap, ni, m, params); 962 IEEE80211_TX_UNLOCK(ic); 963 return (ret); 964 } 965 966 static void 967 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg, 968 int status) 969 { 970 struct ieee80211vap *vap = ni->ni_vap; 971 972 wakeup(vap); 973 } 974 975 /* 976 * Send a null data frame to the specified node. If the station 977 * is setup for QoS then a QoS Null Data frame is constructed. 978 * If this is a WDS station then a 4-address frame is constructed. 979 * 980 * NB: the caller is assumed to have setup a node reference 981 * for use; this is necessary to deal with a race condition 982 * when probing for inactive stations. Like ieee80211_mgmt_output 983 * we must cleanup any node reference on error; however we 984 * can safely just unref it as we know it will never be the 985 * last reference to the node. 986 */ 987 int 988 ieee80211_send_nulldata(struct ieee80211_node *ni) 989 { 990 struct ieee80211vap *vap = ni->ni_vap; 991 struct ieee80211com *ic = ni->ni_ic; 992 struct mbuf *m; 993 struct ieee80211_frame *wh; 994 int hdrlen; 995 uint8_t *frm; 996 int ret; 997 998 if (vap->iv_state == IEEE80211_S_CAC) { 999 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 1000 ni, "block %s frame in CAC state", "null data"); 1001 ieee80211_unref_node(&ni); 1002 vap->iv_stats.is_tx_badstate++; 1003 return EIO; /* XXX */ 1004 } 1005 1006 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 1007 hdrlen = sizeof(struct ieee80211_qosframe); 1008 else 1009 hdrlen = sizeof(struct ieee80211_frame); 1010 /* NB: only WDS vap's get 4-address frames */ 1011 if (vap->iv_opmode == IEEE80211_M_WDS) 1012 hdrlen += IEEE80211_ADDR_LEN; 1013 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1014 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 1015 1016 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 1017 if (m == NULL) { 1018 /* XXX debug msg */ 1019 ieee80211_unref_node(&ni); 1020 vap->iv_stats.is_tx_nobuf++; 1021 return ENOMEM; 1022 } 1023 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 1024 ("leading space %zd", M_LEADINGSPACE(m))); 1025 M_PREPEND(m, hdrlen, M_NOWAIT); 1026 if (m == NULL) { 1027 /* NB: cannot happen */ 1028 ieee80211_free_node(ni); 1029 return ENOMEM; 1030 } 1031 1032 IEEE80211_TX_LOCK(ic); 1033 1034 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 1035 if (ni->ni_flags & IEEE80211_NODE_QOS) { 1036 const int tid = WME_AC_TO_TID(WME_AC_BE); 1037 uint8_t *qos; 1038 1039 ieee80211_send_setup(ni, m, 1040 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 1041 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 1042 1043 if (vap->iv_opmode == IEEE80211_M_WDS) 1044 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1045 else 1046 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1047 qos[0] = tid & IEEE80211_QOS_TID; 1048 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 1049 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1050 qos[1] = 0; 1051 } else { 1052 ieee80211_send_setup(ni, m, 1053 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 1054 IEEE80211_NONQOS_TID, 1055 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 1056 } 1057 if (vap->iv_opmode != IEEE80211_M_WDS) { 1058 /* NB: power management bit is never sent by an AP */ 1059 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 1060 vap->iv_opmode != IEEE80211_M_HOSTAP) 1061 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 1062 } 1063 if ((ic->ic_flags & IEEE80211_F_SCAN) && 1064 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) { 1065 ieee80211_add_callback(m, ieee80211_nulldata_transmitted, 1066 NULL); 1067 } 1068 m->m_len = m->m_pkthdr.len = hdrlen; 1069 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1070 1071 M_WME_SETAC(m, WME_AC_BE); 1072 1073 IEEE80211_NODE_STAT(ni, tx_data); 1074 1075 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 1076 "send %snull data frame on channel %u, pwr mgt %s", 1077 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 1078 ieee80211_chan2ieee(ic, ic->ic_curchan), 1079 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 1080 1081 ret = ieee80211_raw_output(vap, ni, m, NULL); 1082 IEEE80211_TX_UNLOCK(ic); 1083 return (ret); 1084 } 1085 1086 /* 1087 * Assign priority to a frame based on any vlan tag assigned 1088 * to the station and/or any Diffserv setting in an IP header. 1089 * Finally, if an ACM policy is setup (in station mode) it's 1090 * applied. 1091 */ 1092 int 1093 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 1094 { 1095 const struct ether_header *eh = mtod(m, struct ether_header *); 1096 int v_wme_ac, d_wme_ac, ac; 1097 1098 /* 1099 * Always promote PAE/EAPOL frames to high priority. 1100 */ 1101 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 1102 /* NB: mark so others don't need to check header */ 1103 m->m_flags |= M_EAPOL; 1104 ac = WME_AC_VO; 1105 goto done; 1106 } 1107 /* 1108 * Non-qos traffic goes to BE. 1109 */ 1110 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 1111 ac = WME_AC_BE; 1112 goto done; 1113 } 1114 1115 /* 1116 * If node has a vlan tag then all traffic 1117 * to it must have a matching tag. 1118 */ 1119 v_wme_ac = 0; 1120 if (ni->ni_vlan != 0) { 1121 if ((m->m_flags & M_VLANTAG) == 0) { 1122 IEEE80211_NODE_STAT(ni, tx_novlantag); 1123 return 1; 1124 } 1125 #if defined(__DragonFly__) 1126 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 1127 EVL_VLANOFTAG(ni->ni_vlan)) { 1128 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1129 return 1; 1130 } 1131 #else 1132 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 1133 EVL_VLANOFTAG(ni->ni_vlan)) { 1134 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 1135 return 1; 1136 } 1137 #endif 1138 /* map vlan priority to AC */ 1139 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 1140 } 1141 1142 /* XXX m_copydata may be too slow for fast path */ 1143 #ifdef INET 1144 if (eh->ether_type == htons(ETHERTYPE_IP)) { 1145 uint8_t tos; 1146 /* 1147 * IP frame, map the DSCP bits from the TOS field. 1148 */ 1149 /* NB: ip header may not be in first mbuf */ 1150 m_copydata(m, sizeof(struct ether_header) + 1151 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 1152 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1153 d_wme_ac = TID_TO_WME_AC(tos); 1154 } else { 1155 #endif /* INET */ 1156 #ifdef INET6 1157 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 1158 uint32_t flow; 1159 uint8_t tos; 1160 /* 1161 * IPv6 frame, map the DSCP bits from the traffic class field. 1162 */ 1163 m_copydata(m, sizeof(struct ether_header) + 1164 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), &flow); 1165 tos = (uint8_t)(ntohl(flow) >> 20); 1166 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 1167 d_wme_ac = TID_TO_WME_AC(tos); 1168 } else { 1169 #endif /* INET6 */ 1170 d_wme_ac = WME_AC_BE; 1171 #ifdef INET6 1172 } 1173 #endif 1174 #ifdef INET 1175 } 1176 #endif 1177 /* 1178 * Use highest priority AC. 1179 */ 1180 if (v_wme_ac > d_wme_ac) 1181 ac = v_wme_ac; 1182 else 1183 ac = d_wme_ac; 1184 1185 /* 1186 * Apply ACM policy. 1187 */ 1188 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 1189 static const int acmap[4] = { 1190 WME_AC_BK, /* WME_AC_BE */ 1191 WME_AC_BK, /* WME_AC_BK */ 1192 WME_AC_BE, /* WME_AC_VI */ 1193 WME_AC_VI, /* WME_AC_VO */ 1194 }; 1195 struct ieee80211com *ic = ni->ni_ic; 1196 1197 while (ac != WME_AC_BK && 1198 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 1199 ac = acmap[ac]; 1200 } 1201 done: 1202 M_WME_SETAC(m, ac); 1203 return 0; 1204 } 1205 1206 /* 1207 * Insure there is sufficient contiguous space to encapsulate the 1208 * 802.11 data frame. If room isn't already there, arrange for it. 1209 * Drivers and cipher modules assume we have done the necessary work 1210 * and fail rudely if they don't find the space they need. 1211 */ 1212 struct mbuf * 1213 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 1214 struct ieee80211_key *key, struct mbuf *m) 1215 { 1216 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 1217 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 1218 1219 if (key != NULL) { 1220 /* XXX belongs in crypto code? */ 1221 needed_space += key->wk_cipher->ic_header; 1222 /* XXX frags */ 1223 /* 1224 * When crypto is being done in the host we must insure 1225 * the data are writable for the cipher routines; clone 1226 * a writable mbuf chain. 1227 * XXX handle SWMIC specially 1228 */ 1229 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 1230 m = m_unshare(m, M_NOWAIT); 1231 if (m == NULL) { 1232 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1233 "%s: cannot get writable mbuf\n", __func__); 1234 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 1235 return NULL; 1236 } 1237 } 1238 } 1239 /* 1240 * We know we are called just before stripping an Ethernet 1241 * header and prepending an LLC header. This means we know 1242 * there will be 1243 * sizeof(struct ether_header) - sizeof(struct llc) 1244 * bytes recovered to which we need additional space for the 1245 * 802.11 header and any crypto header. 1246 */ 1247 /* XXX check trailing space and copy instead? */ 1248 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 1249 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 1250 if (n == NULL) { 1251 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 1252 "%s: cannot expand storage\n", __func__); 1253 vap->iv_stats.is_tx_nobuf++; 1254 m_freem(m); 1255 return NULL; 1256 } 1257 #if defined(__DragonFly__) 1258 KASSERT(needed_space <= MHLEN, 1259 ("not enough room, need %u got %zd\n", needed_space, MHLEN)); 1260 #else 1261 KASSERT(needed_space <= MHLEN, 1262 ("not enough room, need %u got %d\n", needed_space, MHLEN)); 1263 #endif 1264 /* 1265 * Setup new mbuf to have leading space to prepend the 1266 * 802.11 header and any crypto header bits that are 1267 * required (the latter are added when the driver calls 1268 * back to ieee80211_crypto_encap to do crypto encapsulation). 1269 */ 1270 /* NB: must be first 'cuz it clobbers m_data */ 1271 m_move_pkthdr(n, m); 1272 n->m_len = 0; /* NB: m_gethdr does not set */ 1273 n->m_data += needed_space; 1274 /* 1275 * Pull up Ethernet header to create the expected layout. 1276 * We could use m_pullup but that's overkill (i.e. we don't 1277 * need the actual data) and it cannot fail so do it inline 1278 * for speed. 1279 */ 1280 /* NB: struct ether_header is known to be contiguous */ 1281 n->m_len += sizeof(struct ether_header); 1282 m->m_len -= sizeof(struct ether_header); 1283 m->m_data += sizeof(struct ether_header); 1284 /* 1285 * Replace the head of the chain. 1286 */ 1287 n->m_next = m; 1288 m = n; 1289 } 1290 return m; 1291 #undef TO_BE_RECLAIMED 1292 } 1293 1294 /* 1295 * Return the transmit key to use in sending a unicast frame. 1296 * If a unicast key is set we use that. When no unicast key is set 1297 * we fall back to the default transmit key. 1298 */ 1299 static __inline struct ieee80211_key * 1300 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 1301 struct ieee80211_node *ni) 1302 { 1303 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 1304 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1305 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1306 return NULL; 1307 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1308 } else { 1309 return &ni->ni_ucastkey; 1310 } 1311 } 1312 1313 /* 1314 * Return the transmit key to use in sending a multicast frame. 1315 * Multicast traffic always uses the group key which is installed as 1316 * the default tx key. 1317 */ 1318 static __inline struct ieee80211_key * 1319 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1320 struct ieee80211_node *ni) 1321 { 1322 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1323 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1324 return NULL; 1325 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1326 } 1327 1328 /* 1329 * Encapsulate an outbound data frame. The mbuf chain is updated. 1330 * If an error is encountered NULL is returned. The caller is required 1331 * to provide a node reference and pullup the ethernet header in the 1332 * first mbuf. 1333 * 1334 * NB: Packet is assumed to be processed by ieee80211_classify which 1335 * marked EAPOL frames w/ M_EAPOL. 1336 */ 1337 struct mbuf * 1338 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1339 struct mbuf *m) 1340 { 1341 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1342 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc) 1343 struct ieee80211com *ic = ni->ni_ic; 1344 #ifdef IEEE80211_SUPPORT_MESH 1345 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1346 struct ieee80211_meshcntl_ae10 *mc; 1347 struct ieee80211_mesh_route *rt = NULL; 1348 int dir = -1; 1349 #endif 1350 struct ether_header eh; 1351 struct ieee80211_frame *wh; 1352 struct ieee80211_key *key; 1353 struct llc *llc; 1354 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1355 ieee80211_seq seqno; 1356 int meshhdrsize, meshae; 1357 uint8_t *qos; 1358 int is_amsdu = 0; 1359 1360 IEEE80211_TX_LOCK_ASSERT(ic); 1361 1362 /* 1363 * Copy existing Ethernet header to a safe place. The 1364 * rest of the code assumes it's ok to strip it when 1365 * reorganizing state for the final encapsulation. 1366 */ 1367 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1368 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1369 1370 /* 1371 * Insure space for additional headers. First identify 1372 * transmit key to use in calculating any buffer adjustments 1373 * required. This is also used below to do privacy 1374 * encapsulation work. Then calculate the 802.11 header 1375 * size and any padding required by the driver. 1376 * 1377 * Note key may be NULL if we fall back to the default 1378 * transmit key and that is not set. In that case the 1379 * buffer may not be expanded as needed by the cipher 1380 * routines, but they will/should discard it. 1381 */ 1382 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1383 if (vap->iv_opmode == IEEE80211_M_STA || 1384 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1385 (vap->iv_opmode == IEEE80211_M_WDS && 1386 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1387 key = ieee80211_crypto_getucastkey(vap, ni); 1388 else 1389 key = ieee80211_crypto_getmcastkey(vap, ni); 1390 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1391 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1392 eh.ether_dhost, 1393 "no default transmit key (%s) deftxkey %u", 1394 __func__, vap->iv_def_txkey); 1395 vap->iv_stats.is_tx_nodefkey++; 1396 goto bad; 1397 } 1398 } else 1399 key = NULL; 1400 /* 1401 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1402 * frames so suppress use. This may be an issue if other 1403 * ap's require all data frames to be QoS-encapsulated 1404 * once negotiated in which case we'll need to make this 1405 * configurable. 1406 * NB: mesh data frames are QoS. 1407 */ 1408 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) || 1409 (vap->iv_opmode == IEEE80211_M_MBSS)) && 1410 (m->m_flags & M_EAPOL) == 0; 1411 if (addqos) 1412 hdrsize = sizeof(struct ieee80211_qosframe); 1413 else 1414 hdrsize = sizeof(struct ieee80211_frame); 1415 #ifdef IEEE80211_SUPPORT_MESH 1416 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1417 /* 1418 * Mesh data frames are encapsulated according to the 1419 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1420 * o Group Addressed data (aka multicast) originating 1421 * at the local sta are sent w/ 3-address format and 1422 * address extension mode 00 1423 * o Individually Addressed data (aka unicast) originating 1424 * at the local sta are sent w/ 4-address format and 1425 * address extension mode 00 1426 * o Group Addressed data forwarded from a non-mesh sta are 1427 * sent w/ 3-address format and address extension mode 01 1428 * o Individually Address data from another sta are sent 1429 * w/ 4-address format and address extension mode 10 1430 */ 1431 is4addr = 0; /* NB: don't use, disable */ 1432 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1433 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost); 1434 KASSERT(rt != NULL, ("route is NULL")); 1435 dir = IEEE80211_FC1_DIR_DSTODS; 1436 hdrsize += IEEE80211_ADDR_LEN; 1437 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) { 1438 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate, 1439 vap->iv_myaddr)) { 1440 IEEE80211_NOTE_MAC(vap, 1441 IEEE80211_MSG_MESH, 1442 eh.ether_dhost, 1443 "%s", "trying to send to ourself"); 1444 goto bad; 1445 } 1446 meshae = IEEE80211_MESH_AE_10; 1447 meshhdrsize = 1448 sizeof(struct ieee80211_meshcntl_ae10); 1449 } else { 1450 meshae = IEEE80211_MESH_AE_00; 1451 meshhdrsize = 1452 sizeof(struct ieee80211_meshcntl); 1453 } 1454 } else { 1455 dir = IEEE80211_FC1_DIR_FROMDS; 1456 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1457 /* proxy group */ 1458 meshae = IEEE80211_MESH_AE_01; 1459 meshhdrsize = 1460 sizeof(struct ieee80211_meshcntl_ae01); 1461 } else { 1462 /* group */ 1463 meshae = IEEE80211_MESH_AE_00; 1464 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1465 } 1466 } 1467 } else { 1468 #endif 1469 /* 1470 * 4-address frames need to be generated for: 1471 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1472 * o packets sent through a vap marked for relaying 1473 * (e.g. a station operating with dynamic WDS) 1474 */ 1475 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1476 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1477 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1478 if (is4addr) 1479 hdrsize += IEEE80211_ADDR_LEN; 1480 meshhdrsize = meshae = 0; 1481 #ifdef IEEE80211_SUPPORT_MESH 1482 } 1483 #endif 1484 /* 1485 * Honor driver DATAPAD requirement. 1486 */ 1487 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1488 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1489 else 1490 hdrspace = hdrsize; 1491 1492 if (__predict_true((m->m_flags & M_FF) == 0)) { 1493 /* 1494 * Normal frame. 1495 */ 1496 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1497 if (m == NULL) { 1498 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1499 goto bad; 1500 } 1501 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1502 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1503 llc = mtod(m, struct llc *); 1504 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1505 llc->llc_control = LLC_UI; 1506 llc->llc_snap.org_code[0] = 0; 1507 llc->llc_snap.org_code[1] = 0; 1508 llc->llc_snap.org_code[2] = 0; 1509 llc->llc_snap.ether_type = eh.ether_type; 1510 } else { 1511 #ifdef IEEE80211_SUPPORT_SUPERG 1512 /* 1513 * Aggregated frame. Check if it's for AMSDU or FF. 1514 * 1515 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented 1516 * anywhere for some reason. But, since 11n requires 1517 * AMSDU RX, we can just assume "11n" == "AMSDU". 1518 */ 1519 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__); 1520 if (ieee80211_amsdu_tx_ok(ni)) { 1521 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key); 1522 is_amsdu = 1; 1523 } else { 1524 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1525 } 1526 if (m == NULL) 1527 #endif 1528 goto bad; 1529 } 1530 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1531 1532 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT); 1533 if (m == NULL) { 1534 vap->iv_stats.is_tx_nobuf++; 1535 goto bad; 1536 } 1537 wh = mtod(m, struct ieee80211_frame *); 1538 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1539 *(uint16_t *)wh->i_dur = 0; 1540 qos = NULL; /* NB: quiet compiler */ 1541 if (is4addr) { 1542 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1543 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1544 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1545 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1546 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1547 } else switch (vap->iv_opmode) { 1548 case IEEE80211_M_STA: 1549 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1550 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1551 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1552 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1553 break; 1554 case IEEE80211_M_IBSS: 1555 case IEEE80211_M_AHDEMO: 1556 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1557 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1558 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1559 /* 1560 * NB: always use the bssid from iv_bss as the 1561 * neighbor's may be stale after an ibss merge 1562 */ 1563 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1564 break; 1565 case IEEE80211_M_HOSTAP: 1566 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1567 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1568 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1569 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1570 break; 1571 #ifdef IEEE80211_SUPPORT_MESH 1572 case IEEE80211_M_MBSS: 1573 /* NB: offset by hdrspace to deal with DATAPAD */ 1574 mc = (struct ieee80211_meshcntl_ae10 *) 1575 (mtod(m, uint8_t *) + hdrspace); 1576 wh->i_fc[1] = dir; 1577 switch (meshae) { 1578 case IEEE80211_MESH_AE_00: /* no proxy */ 1579 mc->mc_flags = 0; 1580 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */ 1581 IEEE80211_ADDR_COPY(wh->i_addr1, 1582 ni->ni_macaddr); 1583 IEEE80211_ADDR_COPY(wh->i_addr2, 1584 vap->iv_myaddr); 1585 IEEE80211_ADDR_COPY(wh->i_addr3, 1586 eh.ether_dhost); 1587 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, 1588 eh.ether_shost); 1589 qos =((struct ieee80211_qosframe_addr4 *) 1590 wh)->i_qos; 1591 } else if (dir == IEEE80211_FC1_DIR_FROMDS) { 1592 /* mcast */ 1593 IEEE80211_ADDR_COPY(wh->i_addr1, 1594 eh.ether_dhost); 1595 IEEE80211_ADDR_COPY(wh->i_addr2, 1596 vap->iv_myaddr); 1597 IEEE80211_ADDR_COPY(wh->i_addr3, 1598 eh.ether_shost); 1599 qos = ((struct ieee80211_qosframe *) 1600 wh)->i_qos; 1601 } 1602 break; 1603 case IEEE80211_MESH_AE_01: /* mcast, proxy */ 1604 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1605 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1606 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1607 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1608 mc->mc_flags = 1; 1609 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4, 1610 eh.ether_shost); 1611 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1612 break; 1613 case IEEE80211_MESH_AE_10: /* ucast, proxy */ 1614 KASSERT(rt != NULL, ("route is NULL")); 1615 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop); 1616 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1617 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate); 1618 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1619 mc->mc_flags = IEEE80211_MESH_AE_10; 1620 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost); 1621 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost); 1622 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1623 break; 1624 default: 1625 KASSERT(0, ("meshae %d", meshae)); 1626 break; 1627 } 1628 mc->mc_ttl = ms->ms_ttl; 1629 ms->ms_seq++; 1630 le32enc(mc->mc_seq, ms->ms_seq); 1631 break; 1632 #endif 1633 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1634 default: 1635 goto bad; 1636 } 1637 if (m->m_flags & M_MORE_DATA) 1638 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1639 if (addqos) { 1640 int ac, tid; 1641 1642 if (is4addr) { 1643 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1644 /* NB: mesh case handled earlier */ 1645 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1646 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1647 ac = M_WME_GETAC(m); 1648 /* map from access class/queue to 11e header priorty value */ 1649 tid = WME_AC_TO_TID(ac); 1650 qos[0] = tid & IEEE80211_QOS_TID; 1651 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1652 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1653 #ifdef IEEE80211_SUPPORT_MESH 1654 if (vap->iv_opmode == IEEE80211_M_MBSS) 1655 qos[1] = IEEE80211_QOS_MC; 1656 else 1657 #endif 1658 qos[1] = 0; 1659 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1660 1661 /* 1662 * If this is an A-MSDU then ensure we set the 1663 * relevant field. 1664 */ 1665 if (is_amsdu) 1666 qos[0] |= IEEE80211_QOS_AMSDU; 1667 1668 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1669 /* 1670 * NB: don't assign a sequence # to potential 1671 * aggregates; we expect this happens at the 1672 * point the frame comes off any aggregation q 1673 * as otherwise we may introduce holes in the 1674 * BA sequence space and/or make window accouting 1675 * more difficult. 1676 * 1677 * XXX may want to control this with a driver 1678 * capability; this may also change when we pull 1679 * aggregation up into net80211 1680 */ 1681 seqno = ni->ni_txseqs[tid]++; 1682 *(uint16_t *)wh->i_seq = 1683 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1684 M_SEQNO_SET(m, seqno); 1685 } 1686 } else { 1687 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1688 *(uint16_t *)wh->i_seq = 1689 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1690 M_SEQNO_SET(m, seqno); 1691 1692 /* 1693 * XXX TODO: we shouldn't allow EAPOL, etc that would 1694 * be forced to be non-QoS traffic to be A-MSDU encapsulated. 1695 */ 1696 if (is_amsdu) 1697 kprintf("%s: XXX ERROR: is_amsdu set; not QoS!\n", 1698 __func__); 1699 } 1700 1701 1702 /* check if xmit fragmentation is required */ 1703 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1704 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1705 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1706 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1707 if (key != NULL) { 1708 /* 1709 * IEEE 802.1X: send EAPOL frames always in the clear. 1710 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1711 */ 1712 if ((m->m_flags & M_EAPOL) == 0 || 1713 ((vap->iv_flags & IEEE80211_F_WPA) && 1714 (vap->iv_opmode == IEEE80211_M_STA ? 1715 !IEEE80211_KEY_UNDEFINED(key) : 1716 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1717 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED; 1718 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1719 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1720 eh.ether_dhost, 1721 "%s", "enmic failed, discard frame"); 1722 vap->iv_stats.is_crypto_enmicfail++; 1723 goto bad; 1724 } 1725 } 1726 } 1727 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1728 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1729 goto bad; 1730 1731 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1732 1733 IEEE80211_NODE_STAT(ni, tx_data); 1734 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1735 IEEE80211_NODE_STAT(ni, tx_mcast); 1736 m->m_flags |= M_MCAST; 1737 } else 1738 IEEE80211_NODE_STAT(ni, tx_ucast); 1739 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1740 1741 return m; 1742 bad: 1743 if (m != NULL) 1744 m_freem(m); 1745 return NULL; 1746 #undef WH4 1747 #undef MC01 1748 } 1749 1750 void 1751 ieee80211_free_mbuf(struct mbuf *m) 1752 { 1753 struct mbuf *next; 1754 1755 if (m == NULL) 1756 return; 1757 1758 do { 1759 next = m->m_nextpkt; 1760 m->m_nextpkt = NULL; 1761 m_freem(m); 1762 } while ((m = next) != NULL); 1763 } 1764 1765 /* 1766 * Fragment the frame according to the specified mtu. 1767 * The size of the 802.11 header (w/o padding) is provided 1768 * so we don't need to recalculate it. We create a new 1769 * mbuf for each fragment and chain it through m_nextpkt; 1770 * we might be able to optimize this by reusing the original 1771 * packet's mbufs but that is significantly more complicated. 1772 */ 1773 static int 1774 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1775 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1776 { 1777 struct ieee80211com *ic = vap->iv_ic; 1778 struct ieee80211_frame *wh, *whf; 1779 struct mbuf *m, *prev; 1780 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1781 u_int hdrspace; 1782 1783 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1784 KASSERT(m0->m_pkthdr.len > mtu, 1785 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1786 1787 /* 1788 * Honor driver DATAPAD requirement. 1789 */ 1790 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1791 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1792 else 1793 hdrspace = hdrsize; 1794 1795 wh = mtod(m0, struct ieee80211_frame *); 1796 /* NB: mark the first frag; it will be propagated below */ 1797 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1798 totalhdrsize = hdrspace + ciphdrsize; 1799 fragno = 1; 1800 off = mtu - ciphdrsize; 1801 remainder = m0->m_pkthdr.len - off; 1802 prev = m0; 1803 do { 1804 fragsize = totalhdrsize + remainder; 1805 if (fragsize > mtu) 1806 fragsize = mtu; 1807 /* XXX fragsize can be >2048! */ 1808 KASSERT(fragsize < MCLBYTES, 1809 ("fragment size %u too big!", fragsize)); 1810 if (fragsize > MHLEN) 1811 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 1812 else 1813 m = m_gethdr(M_NOWAIT, MT_DATA); 1814 if (m == NULL) 1815 goto bad; 1816 /* leave room to prepend any cipher header */ 1817 m_align(m, fragsize - ciphdrsize); 1818 1819 /* 1820 * Form the header in the fragment. Note that since 1821 * we mark the first fragment with the MORE_FRAG bit 1822 * it automatically is propagated to each fragment; we 1823 * need only clear it on the last fragment (done below). 1824 * NB: frag 1+ dont have Mesh Control field present. 1825 */ 1826 whf = mtod(m, struct ieee80211_frame *); 1827 memcpy(whf, wh, hdrsize); 1828 #ifdef IEEE80211_SUPPORT_MESH 1829 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1830 if (IEEE80211_IS_DSTODS(wh)) 1831 ((struct ieee80211_qosframe_addr4 *) 1832 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1833 else 1834 ((struct ieee80211_qosframe *) 1835 whf)->i_qos[1] &= ~IEEE80211_QOS_MC; 1836 } 1837 #endif 1838 *(uint16_t *)&whf->i_seq[0] |= htole16( 1839 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1840 IEEE80211_SEQ_FRAG_SHIFT); 1841 fragno++; 1842 1843 payload = fragsize - totalhdrsize; 1844 /* NB: destination is known to be contiguous */ 1845 1846 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace); 1847 m->m_len = hdrspace + payload; 1848 m->m_pkthdr.len = hdrspace + payload; 1849 m->m_flags |= M_FRAG; 1850 1851 /* chain up the fragment */ 1852 prev->m_nextpkt = m; 1853 prev = m; 1854 1855 /* deduct fragment just formed */ 1856 remainder -= payload; 1857 off += payload; 1858 } while (remainder != 0); 1859 1860 /* set the last fragment */ 1861 m->m_flags |= M_LASTFRAG; 1862 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1863 1864 /* strip first mbuf now that everything has been copied */ 1865 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1866 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1867 1868 vap->iv_stats.is_tx_fragframes++; 1869 vap->iv_stats.is_tx_frags += fragno-1; 1870 1871 return 1; 1872 bad: 1873 /* reclaim fragments but leave original frame for caller to free */ 1874 ieee80211_free_mbuf(m0->m_nextpkt); 1875 m0->m_nextpkt = NULL; 1876 return 0; 1877 } 1878 1879 /* 1880 * Add a supported rates element id to a frame. 1881 */ 1882 uint8_t * 1883 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1884 { 1885 int nrates; 1886 1887 *frm++ = IEEE80211_ELEMID_RATES; 1888 nrates = rs->rs_nrates; 1889 if (nrates > IEEE80211_RATE_SIZE) 1890 nrates = IEEE80211_RATE_SIZE; 1891 *frm++ = nrates; 1892 memcpy(frm, rs->rs_rates, nrates); 1893 return frm + nrates; 1894 } 1895 1896 /* 1897 * Add an extended supported rates element id to a frame. 1898 */ 1899 uint8_t * 1900 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1901 { 1902 /* 1903 * Add an extended supported rates element if operating in 11g mode. 1904 */ 1905 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1906 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1907 *frm++ = IEEE80211_ELEMID_XRATES; 1908 *frm++ = nrates; 1909 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1910 frm += nrates; 1911 } 1912 return frm; 1913 } 1914 1915 /* 1916 * Add an ssid element to a frame. 1917 */ 1918 uint8_t * 1919 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1920 { 1921 *frm++ = IEEE80211_ELEMID_SSID; 1922 *frm++ = len; 1923 memcpy(frm, ssid, len); 1924 return frm + len; 1925 } 1926 1927 /* 1928 * Add an erp element to a frame. 1929 */ 1930 static uint8_t * 1931 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1932 { 1933 uint8_t erp; 1934 1935 *frm++ = IEEE80211_ELEMID_ERP; 1936 *frm++ = 1; 1937 erp = 0; 1938 if (ic->ic_nonerpsta != 0) 1939 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1940 if (ic->ic_flags & IEEE80211_F_USEPROT) 1941 erp |= IEEE80211_ERP_USE_PROTECTION; 1942 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1943 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1944 *frm++ = erp; 1945 return frm; 1946 } 1947 1948 /* 1949 * Add a CFParams element to a frame. 1950 */ 1951 static uint8_t * 1952 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1953 { 1954 #define ADDSHORT(frm, v) do { \ 1955 le16enc(frm, v); \ 1956 frm += 2; \ 1957 } while (0) 1958 *frm++ = IEEE80211_ELEMID_CFPARMS; 1959 *frm++ = 6; 1960 *frm++ = 0; /* CFP count */ 1961 *frm++ = 2; /* CFP period */ 1962 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1963 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1964 return frm; 1965 #undef ADDSHORT 1966 } 1967 1968 static __inline uint8_t * 1969 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1970 { 1971 memcpy(frm, ie->ie_data, ie->ie_len); 1972 return frm + ie->ie_len; 1973 } 1974 1975 static __inline uint8_t * 1976 add_ie(uint8_t *frm, const uint8_t *ie) 1977 { 1978 memcpy(frm, ie, 2 + ie[1]); 1979 return frm + 2 + ie[1]; 1980 } 1981 1982 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1983 /* 1984 * Add a WME information element to a frame. 1985 */ 1986 uint8_t * 1987 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1988 { 1989 static const struct ieee80211_wme_info info = { 1990 .wme_id = IEEE80211_ELEMID_VENDOR, 1991 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1992 .wme_oui = { WME_OUI_BYTES }, 1993 .wme_type = WME_OUI_TYPE, 1994 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1995 .wme_version = WME_VERSION, 1996 .wme_info = 0, 1997 }; 1998 memcpy(frm, &info, sizeof(info)); 1999 return frm + sizeof(info); 2000 } 2001 2002 /* 2003 * Add a WME parameters element to a frame. 2004 */ 2005 static uint8_t * 2006 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 2007 { 2008 #define SM(_v, _f) (((_v) << _f##_S) & _f) 2009 #define ADDSHORT(frm, v) do { \ 2010 le16enc(frm, v); \ 2011 frm += 2; \ 2012 } while (0) 2013 /* NB: this works 'cuz a param has an info at the front */ 2014 static const struct ieee80211_wme_info param = { 2015 .wme_id = IEEE80211_ELEMID_VENDOR, 2016 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 2017 .wme_oui = { WME_OUI_BYTES }, 2018 .wme_type = WME_OUI_TYPE, 2019 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 2020 .wme_version = WME_VERSION, 2021 }; 2022 int i; 2023 2024 memcpy(frm, ¶m, sizeof(param)); 2025 frm += __offsetof(struct ieee80211_wme_info, wme_info); 2026 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 2027 *frm++ = 0; /* reserved field */ 2028 for (i = 0; i < WME_NUM_AC; i++) { 2029 const struct wmeParams *ac = 2030 &wme->wme_bssChanParams.cap_wmeParams[i]; 2031 *frm++ = SM(i, WME_PARAM_ACI) 2032 | SM(ac->wmep_acm, WME_PARAM_ACM) 2033 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 2034 ; 2035 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 2036 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 2037 ; 2038 ADDSHORT(frm, ac->wmep_txopLimit); 2039 } 2040 return frm; 2041 #undef SM 2042 #undef ADDSHORT 2043 } 2044 #undef WME_OUI_BYTES 2045 2046 /* 2047 * Add an 11h Power Constraint element to a frame. 2048 */ 2049 static uint8_t * 2050 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 2051 { 2052 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 2053 /* XXX per-vap tx power limit? */ 2054 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 2055 2056 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 2057 frm[1] = 1; 2058 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 2059 return frm + 3; 2060 } 2061 2062 /* 2063 * Add an 11h Power Capability element to a frame. 2064 */ 2065 static uint8_t * 2066 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 2067 { 2068 frm[0] = IEEE80211_ELEMID_PWRCAP; 2069 frm[1] = 2; 2070 frm[2] = c->ic_minpower; 2071 frm[3] = c->ic_maxpower; 2072 return frm + 4; 2073 } 2074 2075 /* 2076 * Add an 11h Supported Channels element to a frame. 2077 */ 2078 static uint8_t * 2079 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 2080 { 2081 static const int ielen = 26; 2082 2083 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 2084 frm[1] = ielen; 2085 /* XXX not correct */ 2086 memcpy(frm+2, ic->ic_chan_avail, ielen); 2087 return frm + 2 + ielen; 2088 } 2089 2090 /* 2091 * Add an 11h Quiet time element to a frame. 2092 */ 2093 static uint8_t * 2094 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap) 2095 { 2096 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm; 2097 2098 quiet->quiet_ie = IEEE80211_ELEMID_QUIET; 2099 quiet->len = 6; 2100 if (vap->iv_quiet_count_value == 1) 2101 vap->iv_quiet_count_value = vap->iv_quiet_count; 2102 else if (vap->iv_quiet_count_value > 1) 2103 vap->iv_quiet_count_value--; 2104 2105 if (vap->iv_quiet_count_value == 0) { 2106 /* value 0 is reserved as per 802.11h standerd */ 2107 vap->iv_quiet_count_value = 1; 2108 } 2109 2110 quiet->tbttcount = vap->iv_quiet_count_value; 2111 quiet->period = vap->iv_quiet_period; 2112 quiet->duration = htole16(vap->iv_quiet_duration); 2113 quiet->offset = htole16(vap->iv_quiet_offset); 2114 return frm + sizeof(*quiet); 2115 } 2116 2117 /* 2118 * Add an 11h Channel Switch Announcement element to a frame. 2119 * Note that we use the per-vap CSA count to adjust the global 2120 * counter so we can use this routine to form probe response 2121 * frames and get the current count. 2122 */ 2123 static uint8_t * 2124 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 2125 { 2126 struct ieee80211com *ic = vap->iv_ic; 2127 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 2128 2129 csa->csa_ie = IEEE80211_ELEMID_CSA; 2130 csa->csa_len = 3; 2131 csa->csa_mode = 1; /* XXX force quiet on channel */ 2132 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 2133 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 2134 return frm + sizeof(*csa); 2135 } 2136 2137 /* 2138 * Add an 11h country information element to a frame. 2139 */ 2140 static uint8_t * 2141 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 2142 { 2143 2144 if (ic->ic_countryie == NULL || 2145 ic->ic_countryie_chan != ic->ic_bsschan) { 2146 /* 2147 * Handle lazy construction of ie. This is done on 2148 * first use and after a channel change that requires 2149 * re-calculation. 2150 */ 2151 if (ic->ic_countryie != NULL) 2152 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE); 2153 ic->ic_countryie = ieee80211_alloc_countryie(ic); 2154 if (ic->ic_countryie == NULL) 2155 return frm; 2156 ic->ic_countryie_chan = ic->ic_bsschan; 2157 } 2158 return add_appie(frm, ic->ic_countryie); 2159 } 2160 2161 uint8_t * 2162 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap) 2163 { 2164 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL) 2165 return (add_ie(frm, vap->iv_wpa_ie)); 2166 else { 2167 /* XXX else complain? */ 2168 return (frm); 2169 } 2170 } 2171 2172 uint8_t * 2173 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap) 2174 { 2175 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL) 2176 return (add_ie(frm, vap->iv_rsn_ie)); 2177 else { 2178 /* XXX else complain? */ 2179 return (frm); 2180 } 2181 } 2182 2183 uint8_t * 2184 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni) 2185 { 2186 if (ni->ni_flags & IEEE80211_NODE_QOS) { 2187 *frm++ = IEEE80211_ELEMID_QOS; 2188 *frm++ = 1; 2189 *frm++ = 0; 2190 } 2191 2192 return (frm); 2193 } 2194 2195 /* 2196 * Send a probe request frame with the specified ssid 2197 * and any optional information element data. 2198 */ 2199 int 2200 ieee80211_send_probereq(struct ieee80211_node *ni, 2201 const uint8_t sa[IEEE80211_ADDR_LEN], 2202 const uint8_t da[IEEE80211_ADDR_LEN], 2203 const uint8_t bssid[IEEE80211_ADDR_LEN], 2204 const uint8_t *ssid, size_t ssidlen) 2205 { 2206 struct ieee80211vap *vap = ni->ni_vap; 2207 struct ieee80211com *ic = ni->ni_ic; 2208 const struct ieee80211_txparam *tp; 2209 struct ieee80211_bpf_params params; 2210 struct ieee80211_frame *wh; 2211 const struct ieee80211_rateset *rs; 2212 struct mbuf *m; 2213 uint8_t *frm; 2214 int ret; 2215 2216 if (vap->iv_state == IEEE80211_S_CAC) { 2217 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 2218 "block %s frame in CAC state", "probe request"); 2219 vap->iv_stats.is_tx_badstate++; 2220 return EIO; /* XXX */ 2221 } 2222 2223 /* 2224 * Hold a reference on the node so it doesn't go away until after 2225 * the xmit is complete all the way in the driver. On error we 2226 * will remove our reference. 2227 */ 2228 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2229 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2230 __func__, __LINE__, 2231 ni, ether_sprintf(ni->ni_macaddr), 2232 ieee80211_node_refcnt(ni)+1); 2233 ieee80211_ref_node(ni); 2234 2235 /* 2236 * prreq frame format 2237 * [tlv] ssid 2238 * [tlv] supported rates 2239 * [tlv] RSN (optional) 2240 * [tlv] extended supported rates 2241 * [tlv] WPA (optional) 2242 * [tlv] user-specified ie's 2243 */ 2244 m = ieee80211_getmgtframe(&frm, 2245 ic->ic_headroom + sizeof(struct ieee80211_frame), 2246 2 + IEEE80211_NWID_LEN 2247 + 2 + IEEE80211_RATE_SIZE 2248 + sizeof(struct ieee80211_ie_wpa) 2249 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2250 + sizeof(struct ieee80211_ie_wpa) 2251 + (vap->iv_appie_probereq != NULL ? 2252 vap->iv_appie_probereq->ie_len : 0) 2253 ); 2254 if (m == NULL) { 2255 vap->iv_stats.is_tx_nobuf++; 2256 ieee80211_free_node(ni); 2257 return ENOMEM; 2258 } 2259 2260 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 2261 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 2262 frm = ieee80211_add_rates(frm, rs); 2263 frm = ieee80211_add_rsn(frm, vap); 2264 frm = ieee80211_add_xrates(frm, rs); 2265 frm = ieee80211_add_wpa(frm, vap); 2266 if (vap->iv_appie_probereq != NULL) 2267 frm = add_appie(frm, vap->iv_appie_probereq); 2268 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2269 2270 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 2271 ("leading space %zd", M_LEADINGSPACE(m))); 2272 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2273 if (m == NULL) { 2274 /* NB: cannot happen */ 2275 ieee80211_free_node(ni); 2276 return ENOMEM; 2277 } 2278 2279 IEEE80211_TX_LOCK(ic); 2280 wh = mtod(m, struct ieee80211_frame *); 2281 ieee80211_send_setup(ni, m, 2282 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 2283 IEEE80211_NONQOS_TID, sa, da, bssid); 2284 /* XXX power management? */ 2285 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2286 2287 M_WME_SETAC(m, WME_AC_BE); 2288 2289 IEEE80211_NODE_STAT(ni, tx_probereq); 2290 IEEE80211_NODE_STAT(ni, tx_mgmt); 2291 2292 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2293 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 2294 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid), 2295 (int)ssidlen, ssid); 2296 2297 memset(¶ms, 0, sizeof(params)); 2298 params.ibp_pri = M_WME_GETAC(m); 2299 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 2300 params.ibp_rate0 = tp->mgmtrate; 2301 if (IEEE80211_IS_MULTICAST(da)) { 2302 params.ibp_flags |= IEEE80211_BPF_NOACK; 2303 params.ibp_try0 = 1; 2304 } else 2305 params.ibp_try0 = tp->maxretry; 2306 params.ibp_power = ni->ni_txpower; 2307 ret = ieee80211_raw_output(vap, ni, m, ¶ms); 2308 IEEE80211_TX_UNLOCK(ic); 2309 return (ret); 2310 } 2311 2312 /* 2313 * Calculate capability information for mgt frames. 2314 */ 2315 uint16_t 2316 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 2317 { 2318 struct ieee80211com *ic = vap->iv_ic; 2319 uint16_t capinfo; 2320 2321 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 2322 2323 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 2324 capinfo = IEEE80211_CAPINFO_ESS; 2325 else if (vap->iv_opmode == IEEE80211_M_IBSS) 2326 capinfo = IEEE80211_CAPINFO_IBSS; 2327 else 2328 capinfo = 0; 2329 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2330 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2331 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2332 IEEE80211_IS_CHAN_2GHZ(chan)) 2333 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2334 if (ic->ic_flags & IEEE80211_F_SHSLOT) 2335 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2336 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 2337 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2338 return capinfo; 2339 } 2340 2341 /* 2342 * Send a management frame. The node is for the destination (or ic_bss 2343 * when in station mode). Nodes other than ic_bss have their reference 2344 * count bumped to reflect our use for an indeterminant time. 2345 */ 2346 int 2347 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 2348 { 2349 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 2350 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 2351 struct ieee80211vap *vap = ni->ni_vap; 2352 struct ieee80211com *ic = ni->ni_ic; 2353 struct ieee80211_node *bss = vap->iv_bss; 2354 struct ieee80211_bpf_params params; 2355 struct mbuf *m; 2356 uint8_t *frm; 2357 uint16_t capinfo; 2358 int has_challenge, is_shared_key, ret, status; 2359 2360 KASSERT(ni != NULL, ("null node")); 2361 2362 /* 2363 * Hold a reference on the node so it doesn't go away until after 2364 * the xmit is complete all the way in the driver. On error we 2365 * will remove our reference. 2366 */ 2367 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2368 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2369 __func__, __LINE__, 2370 ni, ether_sprintf(ni->ni_macaddr), 2371 ieee80211_node_refcnt(ni)+1); 2372 ieee80211_ref_node(ni); 2373 2374 memset(¶ms, 0, sizeof(params)); 2375 switch (type) { 2376 2377 case IEEE80211_FC0_SUBTYPE_AUTH: 2378 status = arg >> 16; 2379 arg &= 0xffff; 2380 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 2381 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 2382 ni->ni_challenge != NULL); 2383 2384 /* 2385 * Deduce whether we're doing open authentication or 2386 * shared key authentication. We do the latter if 2387 * we're in the middle of a shared key authentication 2388 * handshake or if we're initiating an authentication 2389 * request and configured to use shared key. 2390 */ 2391 is_shared_key = has_challenge || 2392 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 2393 (arg == IEEE80211_AUTH_SHARED_REQUEST && 2394 bss->ni_authmode == IEEE80211_AUTH_SHARED); 2395 2396 m = ieee80211_getmgtframe(&frm, 2397 ic->ic_headroom + sizeof(struct ieee80211_frame), 2398 3 * sizeof(uint16_t) 2399 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 2400 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 2401 ); 2402 if (m == NULL) 2403 senderr(ENOMEM, is_tx_nobuf); 2404 2405 ((uint16_t *)frm)[0] = 2406 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 2407 : htole16(IEEE80211_AUTH_ALG_OPEN); 2408 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 2409 ((uint16_t *)frm)[2] = htole16(status);/* status */ 2410 2411 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 2412 ((uint16_t *)frm)[3] = 2413 htole16((IEEE80211_CHALLENGE_LEN << 8) | 2414 IEEE80211_ELEMID_CHALLENGE); 2415 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 2416 IEEE80211_CHALLENGE_LEN); 2417 m->m_pkthdr.len = m->m_len = 2418 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 2419 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 2420 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2421 "request encrypt frame (%s)", __func__); 2422 /* mark frame for encryption */ 2423 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 2424 } 2425 } else 2426 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 2427 2428 /* XXX not right for shared key */ 2429 if (status == IEEE80211_STATUS_SUCCESS) 2430 IEEE80211_NODE_STAT(ni, tx_auth); 2431 else 2432 IEEE80211_NODE_STAT(ni, tx_auth_fail); 2433 2434 if (vap->iv_opmode == IEEE80211_M_STA) 2435 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2436 (void *) vap->iv_state); 2437 break; 2438 2439 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2440 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2441 "send station deauthenticate (reason: %d (%s))", arg, 2442 ieee80211_reason_to_string(arg)); 2443 m = ieee80211_getmgtframe(&frm, 2444 ic->ic_headroom + sizeof(struct ieee80211_frame), 2445 sizeof(uint16_t)); 2446 if (m == NULL) 2447 senderr(ENOMEM, is_tx_nobuf); 2448 *(uint16_t *)frm = htole16(arg); /* reason */ 2449 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2450 2451 IEEE80211_NODE_STAT(ni, tx_deauth); 2452 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 2453 2454 ieee80211_node_unauthorize(ni); /* port closed */ 2455 break; 2456 2457 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 2458 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 2459 /* 2460 * asreq frame format 2461 * [2] capability information 2462 * [2] listen interval 2463 * [6*] current AP address (reassoc only) 2464 * [tlv] ssid 2465 * [tlv] supported rates 2466 * [tlv] extended supported rates 2467 * [4] power capability (optional) 2468 * [28] supported channels (optional) 2469 * [tlv] HT capabilities 2470 * [tlv] WME (optional) 2471 * [tlv] Vendor OUI HT capabilities (optional) 2472 * [tlv] Atheros capabilities (if negotiated) 2473 * [tlv] AppIE's (optional) 2474 */ 2475 m = ieee80211_getmgtframe(&frm, 2476 ic->ic_headroom + sizeof(struct ieee80211_frame), 2477 sizeof(uint16_t) 2478 + sizeof(uint16_t) 2479 + IEEE80211_ADDR_LEN 2480 + 2 + IEEE80211_NWID_LEN 2481 + 2 + IEEE80211_RATE_SIZE 2482 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2483 + 4 2484 + 2 + 26 2485 + sizeof(struct ieee80211_wme_info) 2486 + sizeof(struct ieee80211_ie_htcap) 2487 + 4 + sizeof(struct ieee80211_ie_htcap) 2488 #ifdef IEEE80211_SUPPORT_SUPERG 2489 + sizeof(struct ieee80211_ath_ie) 2490 #endif 2491 + (vap->iv_appie_wpa != NULL ? 2492 vap->iv_appie_wpa->ie_len : 0) 2493 + (vap->iv_appie_assocreq != NULL ? 2494 vap->iv_appie_assocreq->ie_len : 0) 2495 ); 2496 if (m == NULL) 2497 senderr(ENOMEM, is_tx_nobuf); 2498 2499 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2500 ("wrong mode %u", vap->iv_opmode)); 2501 capinfo = IEEE80211_CAPINFO_ESS; 2502 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2503 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2504 /* 2505 * NB: Some 11a AP's reject the request when 2506 * short premable is set. 2507 */ 2508 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2509 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2510 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2511 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2512 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2513 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2514 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2515 (vap->iv_flags & IEEE80211_F_DOTH)) 2516 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2517 *(uint16_t *)frm = htole16(capinfo); 2518 frm += 2; 2519 2520 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2521 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2522 bss->ni_intval)); 2523 frm += 2; 2524 2525 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2526 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2527 frm += IEEE80211_ADDR_LEN; 2528 } 2529 2530 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2531 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2532 frm = ieee80211_add_rsn(frm, vap); 2533 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2534 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2535 frm = ieee80211_add_powercapability(frm, 2536 ic->ic_curchan); 2537 frm = ieee80211_add_supportedchannels(frm, ic); 2538 } 2539 2540 /* 2541 * Check the channel - we may be using an 11n NIC with an 2542 * 11n capable station, but we're configured to be an 11b 2543 * channel. 2544 */ 2545 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2546 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2547 ni->ni_ies.htcap_ie != NULL && 2548 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) { 2549 frm = ieee80211_add_htcap(frm, ni); 2550 } 2551 frm = ieee80211_add_wpa(frm, vap); 2552 if ((ic->ic_flags & IEEE80211_F_WME) && 2553 ni->ni_ies.wme_ie != NULL) 2554 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2555 2556 /* 2557 * Same deal - only send HT info if we're on an 11n 2558 * capable channel. 2559 */ 2560 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2561 IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2562 ni->ni_ies.htcap_ie != NULL && 2563 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) { 2564 frm = ieee80211_add_htcap_vendor(frm, ni); 2565 } 2566 #ifdef IEEE80211_SUPPORT_SUPERG 2567 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2568 frm = ieee80211_add_ath(frm, 2569 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2570 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2571 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2572 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2573 } 2574 #endif /* IEEE80211_SUPPORT_SUPERG */ 2575 if (vap->iv_appie_assocreq != NULL) 2576 frm = add_appie(frm, vap->iv_appie_assocreq); 2577 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2578 2579 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2580 (void *) vap->iv_state); 2581 break; 2582 2583 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2584 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2585 /* 2586 * asresp frame format 2587 * [2] capability information 2588 * [2] status 2589 * [2] association ID 2590 * [tlv] supported rates 2591 * [tlv] extended supported rates 2592 * [tlv] HT capabilities (standard, if STA enabled) 2593 * [tlv] HT information (standard, if STA enabled) 2594 * [tlv] WME (if configured and STA enabled) 2595 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2596 * [tlv] HT information (vendor OUI, if STA enabled) 2597 * [tlv] Atheros capabilities (if STA enabled) 2598 * [tlv] AppIE's (optional) 2599 */ 2600 m = ieee80211_getmgtframe(&frm, 2601 ic->ic_headroom + sizeof(struct ieee80211_frame), 2602 sizeof(uint16_t) 2603 + sizeof(uint16_t) 2604 + sizeof(uint16_t) 2605 + 2 + IEEE80211_RATE_SIZE 2606 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2607 + sizeof(struct ieee80211_ie_htcap) + 4 2608 + sizeof(struct ieee80211_ie_htinfo) + 4 2609 + sizeof(struct ieee80211_wme_param) 2610 #ifdef IEEE80211_SUPPORT_SUPERG 2611 + sizeof(struct ieee80211_ath_ie) 2612 #endif 2613 + (vap->iv_appie_assocresp != NULL ? 2614 vap->iv_appie_assocresp->ie_len : 0) 2615 ); 2616 if (m == NULL) 2617 senderr(ENOMEM, is_tx_nobuf); 2618 2619 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2620 *(uint16_t *)frm = htole16(capinfo); 2621 frm += 2; 2622 2623 *(uint16_t *)frm = htole16(arg); /* status */ 2624 frm += 2; 2625 2626 if (arg == IEEE80211_STATUS_SUCCESS) { 2627 *(uint16_t *)frm = htole16(ni->ni_associd); 2628 IEEE80211_NODE_STAT(ni, tx_assoc); 2629 } else 2630 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2631 frm += 2; 2632 2633 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2634 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2635 /* NB: respond according to what we received */ 2636 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2637 frm = ieee80211_add_htcap(frm, ni); 2638 frm = ieee80211_add_htinfo(frm, ni); 2639 } 2640 if ((vap->iv_flags & IEEE80211_F_WME) && 2641 ni->ni_ies.wme_ie != NULL) 2642 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2643 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2644 frm = ieee80211_add_htcap_vendor(frm, ni); 2645 frm = ieee80211_add_htinfo_vendor(frm, ni); 2646 } 2647 #ifdef IEEE80211_SUPPORT_SUPERG 2648 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2649 frm = ieee80211_add_ath(frm, 2650 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2651 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2652 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2653 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2654 #endif /* IEEE80211_SUPPORT_SUPERG */ 2655 if (vap->iv_appie_assocresp != NULL) 2656 frm = add_appie(frm, vap->iv_appie_assocresp); 2657 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2658 break; 2659 2660 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2661 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2662 "send station disassociate (reason: %d (%s))", arg, 2663 ieee80211_reason_to_string(arg)); 2664 m = ieee80211_getmgtframe(&frm, 2665 ic->ic_headroom + sizeof(struct ieee80211_frame), 2666 sizeof(uint16_t)); 2667 if (m == NULL) 2668 senderr(ENOMEM, is_tx_nobuf); 2669 *(uint16_t *)frm = htole16(arg); /* reason */ 2670 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2671 2672 IEEE80211_NODE_STAT(ni, tx_disassoc); 2673 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2674 break; 2675 2676 default: 2677 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2678 "invalid mgmt frame type %u", type); 2679 senderr(EINVAL, is_tx_unknownmgt); 2680 /* NOTREACHED */ 2681 } 2682 2683 /* NB: force non-ProbeResp frames to the highest queue */ 2684 params.ibp_pri = WME_AC_VO; 2685 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2686 /* NB: we know all frames are unicast */ 2687 params.ibp_try0 = bss->ni_txparms->maxretry; 2688 params.ibp_power = bss->ni_txpower; 2689 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2690 bad: 2691 ieee80211_free_node(ni); 2692 return ret; 2693 #undef senderr 2694 #undef HTFLAGS 2695 } 2696 2697 /* 2698 * Return an mbuf with a probe response frame in it. 2699 * Space is left to prepend and 802.11 header at the 2700 * front but it's left to the caller to fill in. 2701 */ 2702 struct mbuf * 2703 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2704 { 2705 struct ieee80211vap *vap = bss->ni_vap; 2706 struct ieee80211com *ic = bss->ni_ic; 2707 const struct ieee80211_rateset *rs; 2708 struct mbuf *m; 2709 uint16_t capinfo; 2710 uint8_t *frm; 2711 2712 /* 2713 * probe response frame format 2714 * [8] time stamp 2715 * [2] beacon interval 2716 * [2] cabability information 2717 * [tlv] ssid 2718 * [tlv] supported rates 2719 * [tlv] parameter set (FH/DS) 2720 * [tlv] parameter set (IBSS) 2721 * [tlv] country (optional) 2722 * [3] power control (optional) 2723 * [5] channel switch announcement (CSA) (optional) 2724 * [tlv] extended rate phy (ERP) 2725 * [tlv] extended supported rates 2726 * [tlv] RSN (optional) 2727 * [tlv] HT capabilities 2728 * [tlv] HT information 2729 * [tlv] WPA (optional) 2730 * [tlv] WME (optional) 2731 * [tlv] Vendor OUI HT capabilities (optional) 2732 * [tlv] Vendor OUI HT information (optional) 2733 * [tlv] Atheros capabilities 2734 * [tlv] AppIE's (optional) 2735 * [tlv] Mesh ID (MBSS) 2736 * [tlv] Mesh Conf (MBSS) 2737 */ 2738 m = ieee80211_getmgtframe(&frm, 2739 ic->ic_headroom + sizeof(struct ieee80211_frame), 2740 8 2741 + sizeof(uint16_t) 2742 + sizeof(uint16_t) 2743 + 2 + IEEE80211_NWID_LEN 2744 + 2 + IEEE80211_RATE_SIZE 2745 + 7 /* max(7,3) */ 2746 + IEEE80211_COUNTRY_MAX_SIZE 2747 + 3 2748 + sizeof(struct ieee80211_csa_ie) 2749 + sizeof(struct ieee80211_quiet_ie) 2750 + 3 2751 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2752 + sizeof(struct ieee80211_ie_wpa) 2753 + sizeof(struct ieee80211_ie_htcap) 2754 + sizeof(struct ieee80211_ie_htinfo) 2755 + sizeof(struct ieee80211_ie_wpa) 2756 + sizeof(struct ieee80211_wme_param) 2757 + 4 + sizeof(struct ieee80211_ie_htcap) 2758 + 4 + sizeof(struct ieee80211_ie_htinfo) 2759 #ifdef IEEE80211_SUPPORT_SUPERG 2760 + sizeof(struct ieee80211_ath_ie) 2761 #endif 2762 #ifdef IEEE80211_SUPPORT_MESH 2763 + 2 + IEEE80211_MESHID_LEN 2764 + sizeof(struct ieee80211_meshconf_ie) 2765 #endif 2766 + (vap->iv_appie_proberesp != NULL ? 2767 vap->iv_appie_proberesp->ie_len : 0) 2768 ); 2769 if (m == NULL) { 2770 vap->iv_stats.is_tx_nobuf++; 2771 return NULL; 2772 } 2773 2774 memset(frm, 0, 8); /* timestamp should be filled later */ 2775 frm += 8; 2776 *(uint16_t *)frm = htole16(bss->ni_intval); 2777 frm += 2; 2778 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2779 *(uint16_t *)frm = htole16(capinfo); 2780 frm += 2; 2781 2782 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2783 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2784 frm = ieee80211_add_rates(frm, rs); 2785 2786 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2787 *frm++ = IEEE80211_ELEMID_FHPARMS; 2788 *frm++ = 5; 2789 *frm++ = bss->ni_fhdwell & 0x00ff; 2790 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2791 *frm++ = IEEE80211_FH_CHANSET( 2792 ieee80211_chan2ieee(ic, bss->ni_chan)); 2793 *frm++ = IEEE80211_FH_CHANPAT( 2794 ieee80211_chan2ieee(ic, bss->ni_chan)); 2795 *frm++ = bss->ni_fhindex; 2796 } else { 2797 *frm++ = IEEE80211_ELEMID_DSPARMS; 2798 *frm++ = 1; 2799 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2800 } 2801 2802 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2803 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2804 *frm++ = 2; 2805 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2806 } 2807 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2808 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2809 frm = ieee80211_add_countryie(frm, ic); 2810 if (vap->iv_flags & IEEE80211_F_DOTH) { 2811 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2812 frm = ieee80211_add_powerconstraint(frm, vap); 2813 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2814 frm = ieee80211_add_csa(frm, vap); 2815 } 2816 if (vap->iv_flags & IEEE80211_F_DOTH) { 2817 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 2818 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 2819 if (vap->iv_quiet) 2820 frm = ieee80211_add_quiet(frm, vap); 2821 } 2822 } 2823 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2824 frm = ieee80211_add_erp(frm, ic); 2825 frm = ieee80211_add_xrates(frm, rs); 2826 frm = ieee80211_add_rsn(frm, vap); 2827 /* 2828 * NB: legacy 11b clients do not get certain ie's. 2829 * The caller identifies such clients by passing 2830 * a token in legacy to us. Could expand this to be 2831 * any legacy client for stuff like HT ie's. 2832 */ 2833 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2834 legacy != IEEE80211_SEND_LEGACY_11B) { 2835 frm = ieee80211_add_htcap(frm, bss); 2836 frm = ieee80211_add_htinfo(frm, bss); 2837 } 2838 frm = ieee80211_add_wpa(frm, vap); 2839 if (vap->iv_flags & IEEE80211_F_WME) 2840 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2841 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2842 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2843 legacy != IEEE80211_SEND_LEGACY_11B) { 2844 frm = ieee80211_add_htcap_vendor(frm, bss); 2845 frm = ieee80211_add_htinfo_vendor(frm, bss); 2846 } 2847 #ifdef IEEE80211_SUPPORT_SUPERG 2848 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2849 legacy != IEEE80211_SEND_LEGACY_11B) 2850 frm = ieee80211_add_athcaps(frm, bss); 2851 #endif 2852 if (vap->iv_appie_proberesp != NULL) 2853 frm = add_appie(frm, vap->iv_appie_proberesp); 2854 #ifdef IEEE80211_SUPPORT_MESH 2855 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2856 frm = ieee80211_add_meshid(frm, vap); 2857 frm = ieee80211_add_meshconf(frm, vap); 2858 } 2859 #endif 2860 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2861 2862 return m; 2863 } 2864 2865 /* 2866 * Send a probe response frame to the specified mac address. 2867 * This does not go through the normal mgt frame api so we 2868 * can specify the destination address and re-use the bss node 2869 * for the sta reference. 2870 */ 2871 int 2872 ieee80211_send_proberesp(struct ieee80211vap *vap, 2873 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2874 { 2875 struct ieee80211_node *bss = vap->iv_bss; 2876 struct ieee80211com *ic = vap->iv_ic; 2877 struct ieee80211_frame *wh; 2878 struct mbuf *m; 2879 int ret; 2880 2881 if (vap->iv_state == IEEE80211_S_CAC) { 2882 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2883 "block %s frame in CAC state", "probe response"); 2884 vap->iv_stats.is_tx_badstate++; 2885 return EIO; /* XXX */ 2886 } 2887 2888 /* 2889 * Hold a reference on the node so it doesn't go away until after 2890 * the xmit is complete all the way in the driver. On error we 2891 * will remove our reference. 2892 */ 2893 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2894 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2895 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr), 2896 ieee80211_node_refcnt(bss)+1); 2897 ieee80211_ref_node(bss); 2898 2899 m = ieee80211_alloc_proberesp(bss, legacy); 2900 if (m == NULL) { 2901 ieee80211_free_node(bss); 2902 return ENOMEM; 2903 } 2904 2905 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 2906 KASSERT(m != NULL, ("no room for header")); 2907 2908 IEEE80211_TX_LOCK(ic); 2909 wh = mtod(m, struct ieee80211_frame *); 2910 ieee80211_send_setup(bss, m, 2911 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2912 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2913 /* XXX power management? */ 2914 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2915 2916 M_WME_SETAC(m, WME_AC_BE); 2917 2918 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2919 "send probe resp on channel %u to %s%s\n", 2920 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da), 2921 legacy ? " <legacy>" : ""); 2922 IEEE80211_NODE_STAT(bss, tx_mgmt); 2923 2924 ret = ieee80211_raw_output(vap, bss, m, NULL); 2925 IEEE80211_TX_UNLOCK(ic); 2926 return (ret); 2927 } 2928 2929 /* 2930 * Allocate and build a RTS (Request To Send) control frame. 2931 */ 2932 struct mbuf * 2933 ieee80211_alloc_rts(struct ieee80211com *ic, 2934 const uint8_t ra[IEEE80211_ADDR_LEN], 2935 const uint8_t ta[IEEE80211_ADDR_LEN], 2936 uint16_t dur) 2937 { 2938 struct ieee80211_frame_rts *rts; 2939 struct mbuf *m; 2940 2941 /* XXX honor ic_headroom */ 2942 m = m_gethdr(M_NOWAIT, MT_DATA); 2943 if (m != NULL) { 2944 rts = mtod(m, struct ieee80211_frame_rts *); 2945 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2946 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2947 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2948 *(u_int16_t *)rts->i_dur = htole16(dur); 2949 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2950 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2951 2952 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2953 } 2954 return m; 2955 } 2956 2957 /* 2958 * Allocate and build a CTS (Clear To Send) control frame. 2959 */ 2960 struct mbuf * 2961 ieee80211_alloc_cts(struct ieee80211com *ic, 2962 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2963 { 2964 struct ieee80211_frame_cts *cts; 2965 struct mbuf *m; 2966 2967 /* XXX honor ic_headroom */ 2968 m = m_gethdr(M_NOWAIT, MT_DATA); 2969 if (m != NULL) { 2970 cts = mtod(m, struct ieee80211_frame_cts *); 2971 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2972 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2973 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2974 *(u_int16_t *)cts->i_dur = htole16(dur); 2975 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2976 2977 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2978 } 2979 return m; 2980 } 2981 2982 static void 2983 ieee80211_tx_mgt_timeout(void *arg) 2984 { 2985 struct ieee80211vap *vap = arg; 2986 2987 IEEE80211_LOCK(vap->iv_ic); 2988 if (vap->iv_state != IEEE80211_S_INIT && 2989 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2990 /* 2991 * NB: it's safe to specify a timeout as the reason here; 2992 * it'll only be used in the right state. 2993 */ 2994 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN, 2995 IEEE80211_SCAN_FAIL_TIMEOUT); 2996 } 2997 IEEE80211_UNLOCK(vap->iv_ic); 2998 } 2999 3000 /* 3001 * This is the callback set on net80211-sourced transmitted 3002 * authentication request frames. 3003 * 3004 * This does a couple of things: 3005 * 3006 * + If the frame transmitted was a success, it schedules a future 3007 * event which will transition the interface to scan. 3008 * If a state transition _then_ occurs before that event occurs, 3009 * said state transition will cancel this callout. 3010 * 3011 * + If the frame transmit was a failure, it immediately schedules 3012 * the transition back to scan. 3013 */ 3014 static void 3015 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 3016 { 3017 struct ieee80211vap *vap = ni->ni_vap; 3018 enum ieee80211_state ostate = (enum ieee80211_state) arg; 3019 3020 /* 3021 * Frame transmit completed; arrange timer callback. If 3022 * transmit was successfully we wait for response. Otherwise 3023 * we arrange an immediate callback instead of doing the 3024 * callback directly since we don't know what state the driver 3025 * is in (e.g. what locks it is holding). This work should 3026 * not be too time-critical and not happen too often so the 3027 * added overhead is acceptable. 3028 * 3029 * XXX what happens if !acked but response shows up before callback? 3030 */ 3031 if (vap->iv_state == ostate) { 3032 callout_reset(&vap->iv_mgtsend, 3033 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 3034 ieee80211_tx_mgt_timeout, vap); 3035 } 3036 } 3037 3038 static void 3039 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 3040 struct ieee80211_node *ni) 3041 { 3042 struct ieee80211vap *vap = ni->ni_vap; 3043 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 3044 struct ieee80211com *ic = ni->ni_ic; 3045 struct ieee80211_rateset *rs = &ni->ni_rates; 3046 uint16_t capinfo; 3047 3048 /* 3049 * beacon frame format 3050 * [8] time stamp 3051 * [2] beacon interval 3052 * [2] cabability information 3053 * [tlv] ssid 3054 * [tlv] supported rates 3055 * [3] parameter set (DS) 3056 * [8] CF parameter set (optional) 3057 * [tlv] parameter set (IBSS/TIM) 3058 * [tlv] country (optional) 3059 * [3] power control (optional) 3060 * [5] channel switch announcement (CSA) (optional) 3061 * [tlv] extended rate phy (ERP) 3062 * [tlv] extended supported rates 3063 * [tlv] RSN parameters 3064 * [tlv] HT capabilities 3065 * [tlv] HT information 3066 * XXX Vendor-specific OIDs (e.g. Atheros) 3067 * [tlv] WPA parameters 3068 * [tlv] WME parameters 3069 * [tlv] Vendor OUI HT capabilities (optional) 3070 * [tlv] Vendor OUI HT information (optional) 3071 * [tlv] Atheros capabilities (optional) 3072 * [tlv] TDMA parameters (optional) 3073 * [tlv] Mesh ID (MBSS) 3074 * [tlv] Mesh Conf (MBSS) 3075 * [tlv] application data (optional) 3076 */ 3077 3078 memset(bo, 0, sizeof(*bo)); 3079 3080 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 3081 frm += 8; 3082 *(uint16_t *)frm = htole16(ni->ni_intval); 3083 frm += 2; 3084 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3085 bo->bo_caps = (uint16_t *)frm; 3086 *(uint16_t *)frm = htole16(capinfo); 3087 frm += 2; 3088 *frm++ = IEEE80211_ELEMID_SSID; 3089 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 3090 *frm++ = ni->ni_esslen; 3091 memcpy(frm, ni->ni_essid, ni->ni_esslen); 3092 frm += ni->ni_esslen; 3093 } else 3094 *frm++ = 0; 3095 frm = ieee80211_add_rates(frm, rs); 3096 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 3097 *frm++ = IEEE80211_ELEMID_DSPARMS; 3098 *frm++ = 1; 3099 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 3100 } 3101 if (ic->ic_flags & IEEE80211_F_PCF) { 3102 bo->bo_cfp = frm; 3103 frm = ieee80211_add_cfparms(frm, ic); 3104 } 3105 bo->bo_tim = frm; 3106 if (vap->iv_opmode == IEEE80211_M_IBSS) { 3107 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 3108 *frm++ = 2; 3109 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 3110 bo->bo_tim_len = 0; 3111 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3112 vap->iv_opmode == IEEE80211_M_MBSS) { 3113 /* TIM IE is the same for Mesh and Hostap */ 3114 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 3115 3116 tie->tim_ie = IEEE80211_ELEMID_TIM; 3117 tie->tim_len = 4; /* length */ 3118 tie->tim_count = 0; /* DTIM count */ 3119 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 3120 tie->tim_bitctl = 0; /* bitmap control */ 3121 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 3122 frm += sizeof(struct ieee80211_tim_ie); 3123 bo->bo_tim_len = 1; 3124 } 3125 bo->bo_tim_trailer = frm; 3126 if ((vap->iv_flags & IEEE80211_F_DOTH) || 3127 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 3128 frm = ieee80211_add_countryie(frm, ic); 3129 if (vap->iv_flags & IEEE80211_F_DOTH) { 3130 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 3131 frm = ieee80211_add_powerconstraint(frm, vap); 3132 bo->bo_csa = frm; 3133 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 3134 frm = ieee80211_add_csa(frm, vap); 3135 } else 3136 bo->bo_csa = frm; 3137 3138 if (vap->iv_flags & IEEE80211_F_DOTH) { 3139 bo->bo_quiet = frm; 3140 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3141 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) { 3142 if (vap->iv_quiet) 3143 frm = ieee80211_add_quiet(frm,vap); 3144 } 3145 } else 3146 bo->bo_quiet = frm; 3147 3148 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 3149 bo->bo_erp = frm; 3150 frm = ieee80211_add_erp(frm, ic); 3151 } 3152 frm = ieee80211_add_xrates(frm, rs); 3153 frm = ieee80211_add_rsn(frm, vap); 3154 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 3155 frm = ieee80211_add_htcap(frm, ni); 3156 bo->bo_htinfo = frm; 3157 frm = ieee80211_add_htinfo(frm, ni); 3158 } 3159 frm = ieee80211_add_wpa(frm, vap); 3160 if (vap->iv_flags & IEEE80211_F_WME) { 3161 bo->bo_wme = frm; 3162 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 3163 } 3164 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 3165 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 3166 frm = ieee80211_add_htcap_vendor(frm, ni); 3167 frm = ieee80211_add_htinfo_vendor(frm, ni); 3168 } 3169 #ifdef IEEE80211_SUPPORT_SUPERG 3170 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 3171 bo->bo_ath = frm; 3172 frm = ieee80211_add_athcaps(frm, ni); 3173 } 3174 #endif 3175 #ifdef IEEE80211_SUPPORT_TDMA 3176 if (vap->iv_caps & IEEE80211_C_TDMA) { 3177 bo->bo_tdma = frm; 3178 frm = ieee80211_add_tdma(frm, vap); 3179 } 3180 #endif 3181 if (vap->iv_appie_beacon != NULL) { 3182 bo->bo_appie = frm; 3183 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 3184 frm = add_appie(frm, vap->iv_appie_beacon); 3185 } 3186 #ifdef IEEE80211_SUPPORT_MESH 3187 if (vap->iv_opmode == IEEE80211_M_MBSS) { 3188 frm = ieee80211_add_meshid(frm, vap); 3189 bo->bo_meshconf = frm; 3190 frm = ieee80211_add_meshconf(frm, vap); 3191 } 3192 #endif 3193 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 3194 bo->bo_csa_trailer_len = frm - bo->bo_csa; 3195 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 3196 } 3197 3198 /* 3199 * Allocate a beacon frame and fillin the appropriate bits. 3200 */ 3201 struct mbuf * 3202 ieee80211_beacon_alloc(struct ieee80211_node *ni) 3203 { 3204 struct ieee80211vap *vap = ni->ni_vap; 3205 struct ieee80211com *ic = ni->ni_ic; 3206 struct ifnet *ifp = vap->iv_ifp; 3207 struct ieee80211_frame *wh; 3208 struct mbuf *m; 3209 int pktlen; 3210 uint8_t *frm; 3211 3212 /* 3213 * beacon frame format 3214 * [8] time stamp 3215 * [2] beacon interval 3216 * [2] cabability information 3217 * [tlv] ssid 3218 * [tlv] supported rates 3219 * [3] parameter set (DS) 3220 * [8] CF parameter set (optional) 3221 * [tlv] parameter set (IBSS/TIM) 3222 * [tlv] country (optional) 3223 * [3] power control (optional) 3224 * [5] channel switch announcement (CSA) (optional) 3225 * [tlv] extended rate phy (ERP) 3226 * [tlv] extended supported rates 3227 * [tlv] RSN parameters 3228 * [tlv] HT capabilities 3229 * [tlv] HT information 3230 * [tlv] Vendor OUI HT capabilities (optional) 3231 * [tlv] Vendor OUI HT information (optional) 3232 * XXX Vendor-specific OIDs (e.g. Atheros) 3233 * [tlv] WPA parameters 3234 * [tlv] WME parameters 3235 * [tlv] TDMA parameters (optional) 3236 * [tlv] Mesh ID (MBSS) 3237 * [tlv] Mesh Conf (MBSS) 3238 * [tlv] application data (optional) 3239 * NB: we allocate the max space required for the TIM bitmap. 3240 * XXX how big is this? 3241 */ 3242 pktlen = 8 /* time stamp */ 3243 + sizeof(uint16_t) /* beacon interval */ 3244 + sizeof(uint16_t) /* capabilities */ 3245 + 2 + ni->ni_esslen /* ssid */ 3246 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 3247 + 2 + 1 /* DS parameters */ 3248 + 2 + 6 /* CF parameters */ 3249 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 3250 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 3251 + 2 + 1 /* power control */ 3252 + sizeof(struct ieee80211_csa_ie) /* CSA */ 3253 + sizeof(struct ieee80211_quiet_ie) /* Quiet */ 3254 + 2 + 1 /* ERP */ 3255 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 3256 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 3257 2*sizeof(struct ieee80211_ie_wpa) : 0) 3258 /* XXX conditional? */ 3259 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 3260 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 3261 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 3262 sizeof(struct ieee80211_wme_param) : 0) 3263 #ifdef IEEE80211_SUPPORT_SUPERG 3264 + sizeof(struct ieee80211_ath_ie) /* ATH */ 3265 #endif 3266 #ifdef IEEE80211_SUPPORT_TDMA 3267 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 3268 sizeof(struct ieee80211_tdma_param) : 0) 3269 #endif 3270 #ifdef IEEE80211_SUPPORT_MESH 3271 + 2 + ni->ni_meshidlen 3272 + sizeof(struct ieee80211_meshconf_ie) 3273 #endif 3274 + IEEE80211_MAX_APPIE 3275 ; 3276 m = ieee80211_getmgtframe(&frm, 3277 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 3278 if (m == NULL) { 3279 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 3280 "%s: cannot get buf; size %u\n", __func__, pktlen); 3281 vap->iv_stats.is_tx_nobuf++; 3282 return NULL; 3283 } 3284 ieee80211_beacon_construct(m, frm, ni); 3285 3286 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT); 3287 KASSERT(m != NULL, ("no space for 802.11 header?")); 3288 wh = mtod(m, struct ieee80211_frame *); 3289 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 3290 IEEE80211_FC0_SUBTYPE_BEACON; 3291 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 3292 *(uint16_t *)wh->i_dur = 0; 3293 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 3294 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 3295 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 3296 *(uint16_t *)wh->i_seq = 0; 3297 3298 return m; 3299 } 3300 3301 /* 3302 * Update the dynamic parts of a beacon frame based on the current state. 3303 */ 3304 int 3305 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast) 3306 { 3307 struct ieee80211vap *vap = ni->ni_vap; 3308 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off; 3309 struct ieee80211com *ic = ni->ni_ic; 3310 int len_changed = 0; 3311 uint16_t capinfo; 3312 struct ieee80211_frame *wh; 3313 ieee80211_seq seqno; 3314 3315 IEEE80211_LOCK(ic); 3316 /* 3317 * Handle 11h channel change when we've reached the count. 3318 * We must recalculate the beacon frame contents to account 3319 * for the new channel. Note we do this only for the first 3320 * vap that reaches this point; subsequent vaps just update 3321 * their beacon state to reflect the recalculated channel. 3322 */ 3323 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 3324 vap->iv_csa_count == ic->ic_csa_count) { 3325 vap->iv_csa_count = 0; 3326 /* 3327 * Effect channel change before reconstructing the beacon 3328 * frame contents as many places reference ni_chan. 3329 */ 3330 if (ic->ic_csa_newchan != NULL) 3331 ieee80211_csa_completeswitch(ic); 3332 /* 3333 * NB: ieee80211_beacon_construct clears all pending 3334 * updates in bo_flags so we don't need to explicitly 3335 * clear IEEE80211_BEACON_CSA. 3336 */ 3337 ieee80211_beacon_construct(m, 3338 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni); 3339 3340 /* XXX do WME aggressive mode processing? */ 3341 IEEE80211_UNLOCK(ic); 3342 return 1; /* just assume length changed */ 3343 } 3344 3345 wh = mtod(m, struct ieee80211_frame *); 3346 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 3347 *(uint16_t *)&wh->i_seq[0] = 3348 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 3349 M_SEQNO_SET(m, seqno); 3350 3351 /* XXX faster to recalculate entirely or just changes? */ 3352 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 3353 *bo->bo_caps = htole16(capinfo); 3354 3355 if (vap->iv_flags & IEEE80211_F_WME) { 3356 struct ieee80211_wme_state *wme = &ic->ic_wme; 3357 3358 /* 3359 * Check for aggressive mode change. When there is 3360 * significant high priority traffic in the BSS 3361 * throttle back BE traffic by using conservative 3362 * parameters. Otherwise BE uses aggressive params 3363 * to optimize performance of legacy/non-QoS traffic. 3364 */ 3365 if (wme->wme_flags & WME_F_AGGRMODE) { 3366 if (wme->wme_hipri_traffic > 3367 wme->wme_hipri_switch_thresh) { 3368 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3369 "%s: traffic %u, disable aggressive mode\n", 3370 __func__, wme->wme_hipri_traffic); 3371 wme->wme_flags &= ~WME_F_AGGRMODE; 3372 ieee80211_wme_updateparams_locked(vap); 3373 wme->wme_hipri_traffic = 3374 wme->wme_hipri_switch_hysteresis; 3375 } else 3376 wme->wme_hipri_traffic = 0; 3377 } else { 3378 if (wme->wme_hipri_traffic <= 3379 wme->wme_hipri_switch_thresh) { 3380 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 3381 "%s: traffic %u, enable aggressive mode\n", 3382 __func__, wme->wme_hipri_traffic); 3383 wme->wme_flags |= WME_F_AGGRMODE; 3384 ieee80211_wme_updateparams_locked(vap); 3385 wme->wme_hipri_traffic = 0; 3386 } else 3387 wme->wme_hipri_traffic = 3388 wme->wme_hipri_switch_hysteresis; 3389 } 3390 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 3391 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 3392 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 3393 } 3394 } 3395 3396 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 3397 ieee80211_ht_update_beacon(vap, bo); 3398 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 3399 } 3400 #ifdef IEEE80211_SUPPORT_TDMA 3401 if (vap->iv_caps & IEEE80211_C_TDMA) { 3402 /* 3403 * NB: the beacon is potentially updated every TBTT. 3404 */ 3405 ieee80211_tdma_update_beacon(vap, bo); 3406 } 3407 #endif 3408 #ifdef IEEE80211_SUPPORT_MESH 3409 if (vap->iv_opmode == IEEE80211_M_MBSS) 3410 ieee80211_mesh_update_beacon(vap, bo); 3411 #endif 3412 3413 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 3414 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 3415 struct ieee80211_tim_ie *tie = 3416 (struct ieee80211_tim_ie *) bo->bo_tim; 3417 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 3418 u_int timlen, timoff, i; 3419 /* 3420 * ATIM/DTIM needs updating. If it fits in the 3421 * current space allocated then just copy in the 3422 * new bits. Otherwise we need to move any trailing 3423 * data to make room. Note that we know there is 3424 * contiguous space because ieee80211_beacon_allocate 3425 * insures there is space in the mbuf to write a 3426 * maximal-size virtual bitmap (based on iv_max_aid). 3427 */ 3428 /* 3429 * Calculate the bitmap size and offset, copy any 3430 * trailer out of the way, and then copy in the 3431 * new bitmap and update the information element. 3432 * Note that the tim bitmap must contain at least 3433 * one byte and any offset must be even. 3434 */ 3435 if (vap->iv_ps_pending != 0) { 3436 timoff = 128; /* impossibly large */ 3437 for (i = 0; i < vap->iv_tim_len; i++) 3438 if (vap->iv_tim_bitmap[i]) { 3439 timoff = i &~ 1; 3440 break; 3441 } 3442 KASSERT(timoff != 128, ("tim bitmap empty!")); 3443 for (i = vap->iv_tim_len-1; i >= timoff; i--) 3444 if (vap->iv_tim_bitmap[i]) 3445 break; 3446 timlen = 1 + (i - timoff); 3447 } else { 3448 timoff = 0; 3449 timlen = 1; 3450 } 3451 if (timlen != bo->bo_tim_len) { 3452 /* copy up/down trailer */ 3453 int adjust = tie->tim_bitmap+timlen 3454 - bo->bo_tim_trailer; 3455 bcopy(bo->bo_tim_trailer, 3456 bo->bo_tim_trailer+adjust, 3457 bo->bo_tim_trailer_len); 3458 bo->bo_tim_trailer += adjust; 3459 bo->bo_erp += adjust; 3460 bo->bo_htinfo += adjust; 3461 #ifdef IEEE80211_SUPPORT_SUPERG 3462 bo->bo_ath += adjust; 3463 #endif 3464 #ifdef IEEE80211_SUPPORT_TDMA 3465 bo->bo_tdma += adjust; 3466 #endif 3467 #ifdef IEEE80211_SUPPORT_MESH 3468 bo->bo_meshconf += adjust; 3469 #endif 3470 bo->bo_appie += adjust; 3471 bo->bo_wme += adjust; 3472 bo->bo_csa += adjust; 3473 bo->bo_quiet += adjust; 3474 bo->bo_tim_len = timlen; 3475 3476 /* update information element */ 3477 tie->tim_len = 3 + timlen; 3478 tie->tim_bitctl = timoff; 3479 len_changed = 1; 3480 } 3481 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 3482 bo->bo_tim_len); 3483 3484 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 3485 3486 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 3487 "%s: TIM updated, pending %u, off %u, len %u\n", 3488 __func__, vap->iv_ps_pending, timoff, timlen); 3489 } 3490 /* count down DTIM period */ 3491 if (tie->tim_count == 0) 3492 tie->tim_count = tie->tim_period - 1; 3493 else 3494 tie->tim_count--; 3495 /* update state for buffered multicast frames on DTIM */ 3496 if (mcast && tie->tim_count == 0) 3497 tie->tim_bitctl |= 1; 3498 else 3499 tie->tim_bitctl &= ~1; 3500 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 3501 struct ieee80211_csa_ie *csa = 3502 (struct ieee80211_csa_ie *) bo->bo_csa; 3503 3504 /* 3505 * Insert or update CSA ie. If we're just starting 3506 * to count down to the channel switch then we need 3507 * to insert the CSA ie. Otherwise we just need to 3508 * drop the count. The actual change happens above 3509 * when the vap's count reaches the target count. 3510 */ 3511 if (vap->iv_csa_count == 0) { 3512 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3513 bo->bo_erp += sizeof(*csa); 3514 bo->bo_htinfo += sizeof(*csa); 3515 bo->bo_wme += sizeof(*csa); 3516 #ifdef IEEE80211_SUPPORT_SUPERG 3517 bo->bo_ath += sizeof(*csa); 3518 #endif 3519 #ifdef IEEE80211_SUPPORT_TDMA 3520 bo->bo_tdma += sizeof(*csa); 3521 #endif 3522 #ifdef IEEE80211_SUPPORT_MESH 3523 bo->bo_meshconf += sizeof(*csa); 3524 #endif 3525 bo->bo_appie += sizeof(*csa); 3526 bo->bo_csa_trailer_len += sizeof(*csa); 3527 bo->bo_quiet += sizeof(*csa); 3528 bo->bo_tim_trailer_len += sizeof(*csa); 3529 m->m_len += sizeof(*csa); 3530 m->m_pkthdr.len += sizeof(*csa); 3531 3532 ieee80211_add_csa(bo->bo_csa, vap); 3533 } else 3534 csa->csa_count--; 3535 vap->iv_csa_count++; 3536 /* NB: don't clear IEEE80211_BEACON_CSA */ 3537 } 3538 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) && 3539 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){ 3540 if (vap->iv_quiet) 3541 ieee80211_add_quiet(bo->bo_quiet, vap); 3542 } 3543 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3544 /* 3545 * ERP element needs updating. 3546 */ 3547 (void) ieee80211_add_erp(bo->bo_erp, ic); 3548 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3549 } 3550 #ifdef IEEE80211_SUPPORT_SUPERG 3551 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3552 ieee80211_add_athcaps(bo->bo_ath, ni); 3553 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3554 } 3555 #endif 3556 } 3557 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3558 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3559 int aielen; 3560 uint8_t *frm; 3561 3562 aielen = 0; 3563 if (aie != NULL) 3564 aielen += aie->ie_len; 3565 if (aielen != bo->bo_appie_len) { 3566 /* copy up/down trailer */ 3567 int adjust = aielen - bo->bo_appie_len; 3568 bcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3569 bo->bo_tim_trailer_len); 3570 bo->bo_tim_trailer += adjust; 3571 bo->bo_appie += adjust; 3572 bo->bo_appie_len = aielen; 3573 3574 len_changed = 1; 3575 } 3576 frm = bo->bo_appie; 3577 if (aie != NULL) 3578 frm = add_appie(frm, aie); 3579 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3580 } 3581 IEEE80211_UNLOCK(ic); 3582 3583 return len_changed; 3584 } 3585 3586 /* 3587 * Do Ethernet-LLC encapsulation for each payload in a fast frame 3588 * tunnel encapsulation. The frame is assumed to have an Ethernet 3589 * header at the front that must be stripped before prepending the 3590 * LLC followed by the Ethernet header passed in (with an Ethernet 3591 * type that specifies the payload size). 3592 */ 3593 struct mbuf * 3594 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 3595 const struct ether_header *eh) 3596 { 3597 struct llc *llc; 3598 uint16_t payload; 3599 3600 /* XXX optimize by combining m_adj+M_PREPEND */ 3601 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 3602 llc = mtod(m, struct llc *); 3603 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 3604 llc->llc_control = LLC_UI; 3605 llc->llc_snap.org_code[0] = 0; 3606 llc->llc_snap.org_code[1] = 0; 3607 llc->llc_snap.org_code[2] = 0; 3608 llc->llc_snap.ether_type = eh->ether_type; 3609 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 3610 3611 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT); 3612 if (m == NULL) { /* XXX cannot happen */ 3613 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 3614 "%s: no space for ether_header\n", __func__); 3615 vap->iv_stats.is_tx_nobuf++; 3616 return NULL; 3617 } 3618 ETHER_HEADER_COPY(mtod(m, void *), eh); 3619 mtod(m, struct ether_header *)->ether_type = htons(payload); 3620 return m; 3621 } 3622 3623 /* 3624 * Complete an mbuf transmission. 3625 * 3626 * For now, this simply processes a completed frame after the 3627 * driver has completed it's transmission and/or retransmission. 3628 * It assumes the frame is an 802.11 encapsulated frame. 3629 * 3630 * Later on it will grow to become the exit path for a given frame 3631 * from the driver and, depending upon how it's been encapsulated 3632 * and already transmitted, it may end up doing A-MPDU retransmission, 3633 * power save requeuing, etc. 3634 * 3635 * In order for the above to work, the driver entry point to this 3636 * must not hold any driver locks. Thus, the driver needs to delay 3637 * any actual mbuf completion until it can release said locks. 3638 * 3639 * This frees the mbuf and if the mbuf has a node reference, 3640 * the node reference will be freed. 3641 */ 3642 void 3643 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status) 3644 { 3645 3646 if (ni != NULL) { 3647 struct ifnet *ifp = ni->ni_vap->iv_ifp; 3648 3649 if (status == 0) { 3650 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 3651 #if defined(__DragonFly__) 3652 /* 3653 * On DragonFly, IFCOUNTER_OBYTES and 3654 * IFCOUNTER_OMCASTS increments are currently done 3655 * by ifq_dispatch() already. 3656 */ 3657 #else 3658 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); 3659 if (m->m_flags & M_MCAST) 3660 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 3661 #endif 3662 } else 3663 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 3664 if (m->m_flags & M_TXCB) 3665 ieee80211_process_callback(ni, m, status); 3666 ieee80211_free_node(ni); 3667 } 3668 m_freem(m); 3669 } 3670