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