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