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 * $FreeBSD: head/sys/net80211/ieee80211_output.c 198384 2009-10-23 11:13:08Z rpaulo $ 27 * $DragonFly$ 28 */ 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/route.h> 45 #include <net/if.h> 46 #include <net/if_llc.h> 47 #include <net/if_media.h> 48 #include <net/ifq_var.h> 49 50 #include <netproto/802_11/ieee80211_var.h> 51 #include <netproto/802_11/ieee80211_regdomain.h> 52 #ifdef IEEE80211_SUPPORT_SUPERG 53 #include <netproto/802_11/ieee80211_superg.h> 54 #endif 55 #ifdef IEEE80211_SUPPORT_TDMA 56 #include <netproto/802_11/ieee80211_tdma.h> 57 #endif 58 #include <netproto/802_11/ieee80211_wds.h> 59 #include <netproto/802_11/ieee80211_mesh.h> 60 61 #ifdef INET 62 #include <netinet/in.h> 63 #include <netinet/if_ether.h> 64 #include <netinet/in_systm.h> 65 #include <netinet/ip.h> 66 #endif 67 #ifdef INET6 68 #include <netinet/ip6.h> 69 #endif 70 71 #define ETHER_HEADER_COPY(dst, src) \ 72 memcpy(dst, src, sizeof(struct ether_header)) 73 74 /* unalligned little endian access */ 75 #define LE_WRITE_2(p, v) do { \ 76 ((uint8_t *)(p))[0] = (v) & 0xff; \ 77 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 78 } while (0) 79 #define LE_WRITE_4(p, v) do { \ 80 ((uint8_t *)(p))[0] = (v) & 0xff; \ 81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 82 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 83 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 84 } while (0) 85 86 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 87 u_int hdrsize, u_int ciphdrsize, u_int mtu); 88 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 89 90 #ifdef IEEE80211_DEBUG 91 /* 92 * Decide if an outbound management frame should be 93 * printed when debugging is enabled. This filters some 94 * of the less interesting frames that come frequently 95 * (e.g. beacons). 96 */ 97 static __inline int 98 doprint(struct ieee80211vap *vap, int subtype) 99 { 100 switch (subtype) { 101 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 102 return (vap->iv_opmode == IEEE80211_M_IBSS); 103 } 104 return 1; 105 } 106 #endif 107 108 /* 109 * Start method for vap's. All packets from the stack come 110 * through here. We handle common processing of the packets 111 * before dispatching them to the underlying device. 112 */ 113 void 114 ieee80211_start(struct ifnet *ifp) 115 { 116 #define IS_DWDS(vap) \ 117 (vap->iv_opmode == IEEE80211_M_WDS && \ 118 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 119 struct ieee80211vap *vap = ifp->if_softc; 120 struct ieee80211com *ic = vap->iv_ic; 121 struct ifnet *parent = ic->ic_ifp; 122 struct ieee80211_node *ni; 123 struct mbuf *m = NULL; 124 struct ether_header *eh; 125 int error; 126 127 /* NB: parent must be up and running */ 128 if (!IFNET_IS_UP_RUNNING(parent)) { 129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 130 "%s: ignore queue, parent %s not up+running\n", 131 __func__, parent->if_xname); 132 /* XXX stat */ 133 ifq_purge(&ifp->if_snd); 134 return; 135 } 136 if (vap->iv_state == IEEE80211_S_SLEEP) { 137 /* 138 * In power save, wakeup device for transmit. 139 */ 140 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 141 ifq_purge(&ifp->if_snd); 142 return; 143 } 144 /* 145 * No data frames go out unless we're running. 146 * Note in particular this covers CAC and CSA 147 * states (though maybe we should check muting 148 * for CSA). 149 */ 150 if (vap->iv_state != IEEE80211_S_RUN) { 151 /* re-check under the com lock to avoid races */ 152 if (vap->iv_state != IEEE80211_S_RUN) { 153 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 154 "%s: ignore queue, in %s state\n", 155 __func__, ieee80211_state_name[vap->iv_state]); 156 vap->iv_stats.is_tx_badstate++; 157 ifp->if_flags |= IFF_OACTIVE; 158 return; 159 } 160 } 161 for (;;) { 162 m = ifq_dequeue(&ifp->if_snd, NULL); 163 if (m == NULL) 164 break; 165 /* 166 * Sanitize mbuf flags for net80211 use. We cannot 167 * clear M_PWR_SAV or M_MORE_DATA because these may 168 * be set for frames that are re-submitted from the 169 * power save queue. 170 * 171 * NB: This must be done before ieee80211_classify as 172 * it marks EAPOL in frames with M_EAPOL. 173 */ 174 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 175 /* 176 * Cancel any background scan. 177 */ 178 if (ic->ic_flags & IEEE80211_F_SCAN) 179 ieee80211_cancel_anyscan(vap); 180 /* 181 * Find the node for the destination so we can do 182 * things like power save and fast frames aggregation. 183 * 184 * NB: past this point various code assumes the first 185 * mbuf has the 802.3 header present (and contiguous). 186 */ 187 ni = NULL; 188 if (m->m_len < sizeof(struct ether_header) && 189 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 190 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 191 "discard frame, %s\n", "m_pullup failed"); 192 vap->iv_stats.is_tx_nobuf++; /* XXX */ 193 ifp->if_oerrors++; 194 continue; 195 } 196 eh = mtod(m, struct ether_header *); 197 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 198 if (IS_DWDS(vap)) { 199 /* 200 * Only unicast frames from the above go out 201 * DWDS vaps; multicast frames are handled by 202 * dispatching the frame as it comes through 203 * the AP vap (see below). 204 */ 205 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 206 eh->ether_dhost, "mcast", "%s", "on DWDS"); 207 vap->iv_stats.is_dwds_mcast++; 208 m_freem(m); 209 continue; 210 } 211 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 212 /* 213 * Spam DWDS vap's w/ multicast traffic. 214 */ 215 /* XXX only if dwds in use? */ 216 ieee80211_dwds_mcast(vap, m); 217 } 218 } 219 #ifdef IEEE80211_SUPPORT_MESH 220 if (vap->iv_opmode != IEEE80211_M_MBSS) { 221 #endif 222 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 223 if (ni == NULL) { 224 /* NB: ieee80211_find_txnode does stat+msg */ 225 ifp->if_oerrors++; 226 m_freem(m); 227 continue; 228 } 229 if (ni->ni_associd == 0 && 230 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 231 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 232 eh->ether_dhost, NULL, 233 "sta not associated (type 0x%04x)", 234 htons(eh->ether_type)); 235 vap->iv_stats.is_tx_notassoc++; 236 ifp->if_oerrors++; 237 m_freem(m); 238 ieee80211_free_node(ni); 239 continue; 240 } 241 #ifdef IEEE80211_SUPPORT_MESH 242 } else { 243 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 244 /* 245 * Proxy station only if configured. 246 */ 247 if (!ieee80211_mesh_isproxyena(vap)) { 248 IEEE80211_DISCARD_MAC(vap, 249 IEEE80211_MSG_OUTPUT | 250 IEEE80211_MSG_MESH, 251 eh->ether_dhost, NULL, 252 "%s", "proxy not enabled"); 253 vap->iv_stats.is_mesh_notproxy++; 254 ifp->if_oerrors++; 255 m_freem(m); 256 continue; 257 } 258 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 259 } 260 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 261 if (ni == NULL) { 262 /* 263 * NB: ieee80211_mesh_discover holds/disposes 264 * frame (e.g. queueing on path discovery). 265 */ 266 ifp->if_oerrors++; 267 continue; 268 } 269 } 270 #endif 271 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 272 (m->m_flags & M_PWR_SAV) == 0) { 273 /* 274 * Station in power save mode; pass the frame 275 * to the 802.11 layer and continue. We'll get 276 * the frame back when the time is right. 277 * XXX lose WDS vap linkage? 278 */ 279 (void) ieee80211_pwrsave(ni, m); 280 ieee80211_free_node(ni); 281 continue; 282 } 283 /* calculate priority so drivers can find the tx queue */ 284 if (ieee80211_classify(ni, m)) { 285 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 286 eh->ether_dhost, NULL, 287 "%s", "classification failure"); 288 vap->iv_stats.is_tx_classify++; 289 ifp->if_oerrors++; 290 m_freem(m); 291 ieee80211_free_node(ni); 292 continue; 293 } 294 /* 295 * Stash the node pointer. Note that we do this after 296 * any call to ieee80211_dwds_mcast because that code 297 * uses any existing value for rcvif to identify the 298 * interface it (might have been) received on. 299 */ 300 m->m_pkthdr.rcvif = (void *)ni; 301 302 BPF_MTAP(ifp, m); /* 802.3 tx */ 303 304 /* 305 * Check if A-MPDU tx aggregation is setup or if we 306 * should try to enable it. The sta must be associated 307 * with HT and A-MPDU enabled for use. When the policy 308 * routine decides we should enable A-MPDU we issue an 309 * ADDBA request and wait for a reply. The frame being 310 * encapsulated will go out w/o using A-MPDU, or possibly 311 * it might be collected by the driver and held/retransmit. 312 * The default ic_ampdu_enable routine handles staggering 313 * ADDBA requests in case the receiver NAK's us or we are 314 * otherwise unable to establish a BA stream. 315 */ 316 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 317 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 318 (m->m_flags & M_EAPOL) == 0) { 319 const int ac = M_WME_GETAC(m); 320 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 321 322 ieee80211_txampdu_count_packet(tap); 323 if (IEEE80211_AMPDU_RUNNING(tap)) { 324 /* 325 * Operational, mark frame for aggregation. 326 * 327 * XXX do tx aggregation here 328 */ 329 m->m_flags |= M_AMPDU_MPDU; 330 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 331 ic->ic_ampdu_enable(ni, tap)) { 332 /* 333 * Not negotiated yet, request service. 334 */ 335 ieee80211_ampdu_request(ni, tap); 336 /* XXX hold frame for reply? */ 337 } 338 } 339 #ifdef IEEE80211_SUPPORT_SUPERG 340 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 341 m = ieee80211_ff_check(ni, m); 342 if (m == NULL) { 343 /* NB: any ni ref held on stageq */ 344 continue; 345 } 346 } 347 #endif /* IEEE80211_SUPPORT_SUPERG */ 348 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 349 /* 350 * Encapsulate the packet in prep for transmission. 351 */ 352 m = ieee80211_encap(vap, ni, m); 353 if (m == NULL) { 354 /* NB: stat+msg handled in ieee80211_encap */ 355 ieee80211_free_node(ni); 356 continue; 357 } 358 } 359 360 error = ieee80211_handoff(parent, m); 361 if (error != 0) { 362 /* NB: IFQ_HANDOFF reclaims mbuf */ 363 ieee80211_free_node(ni); 364 } else { 365 ifp->if_opackets++; 366 } 367 ic->ic_lastdata = ticks; 368 } 369 #undef IS_DWDS 370 } 371 372 373 /* 374 * 802.11 output routine. This is (currently) used only to 375 * connect bpf write calls to the 802.11 layer for injecting 376 * raw 802.11 frames. 377 */ 378 int 379 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 380 struct sockaddr *dst, struct rtentry *rt) 381 { 382 #define senderr(e) do { error = (e); goto bad;} while (0) 383 struct ieee80211_node *ni = NULL; 384 struct ieee80211vap *vap; 385 struct ieee80211_frame *wh; 386 int error; 387 388 if (ifp->if_flags & IFF_OACTIVE) { 389 /* 390 * Short-circuit requests if the vap is marked OACTIVE 391 * as this can happen because a packet came down through 392 * ieee80211_start before the vap entered RUN state in 393 * which case it's ok to just drop the frame. This 394 * should not be necessary but callers of if_output don't 395 * check OACTIVE. 396 */ 397 senderr(ENETDOWN); 398 } 399 vap = ifp->if_softc; 400 /* 401 * Hand to the 802.3 code if not tagged as 402 * a raw 802.11 frame. 403 */ 404 if (dst->sa_family != AF_IEEE80211) 405 return vap->iv_output(ifp, m, dst, rt); 406 #ifdef MAC 407 error = mac_ifnet_check_transmit(ifp, m); 408 if (error) 409 senderr(error); 410 #endif 411 if (ifp->if_flags & IFF_MONITOR) 412 senderr(ENETDOWN); 413 if (!IFNET_IS_UP_RUNNING(ifp)) 414 senderr(ENETDOWN); 415 if (vap->iv_state == IEEE80211_S_CAC) { 416 IEEE80211_DPRINTF(vap, 417 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 418 "block %s frame in CAC state\n", "raw data"); 419 vap->iv_stats.is_tx_badstate++; 420 senderr(EIO); /* XXX */ 421 } 422 /* XXX bypass bridge, pfil, carp, etc. */ 423 424 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 425 senderr(EIO); /* XXX */ 426 wh = mtod(m, struct ieee80211_frame *); 427 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 428 IEEE80211_FC0_VERSION_0) 429 senderr(EIO); /* XXX */ 430 431 /* locate destination node */ 432 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 433 case IEEE80211_FC1_DIR_NODS: 434 case IEEE80211_FC1_DIR_FROMDS: 435 ni = ieee80211_find_txnode(vap, wh->i_addr1); 436 break; 437 case IEEE80211_FC1_DIR_TODS: 438 case IEEE80211_FC1_DIR_DSTODS: 439 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 440 senderr(EIO); /* XXX */ 441 ni = ieee80211_find_txnode(vap, wh->i_addr3); 442 break; 443 default: 444 senderr(EIO); /* XXX */ 445 } 446 if (ni == NULL) { 447 /* 448 * Permit packets w/ bpf params through regardless 449 * (see below about sa_len). 450 */ 451 if (dst->sa_len == 0) 452 senderr(EHOSTUNREACH); 453 ni = ieee80211_ref_node(vap->iv_bss); 454 } 455 456 /* 457 * Sanitize mbuf for net80211 flags leaked from above. 458 * 459 * NB: This must be done before ieee80211_classify as 460 * it marks EAPOL in frames with M_EAPOL. 461 */ 462 m->m_flags &= ~M_80211_TX; 463 464 /* calculate priority so drivers can find the tx queue */ 465 /* XXX assumes an 802.3 frame */ 466 if (ieee80211_classify(ni, m)) 467 senderr(EIO); /* XXX */ 468 469 ifp->if_opackets++; 470 IEEE80211_NODE_STAT(ni, tx_data); 471 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 472 IEEE80211_NODE_STAT(ni, tx_mcast); 473 m->m_flags |= M_MCAST; 474 } else 475 IEEE80211_NODE_STAT(ni, tx_ucast); 476 /* NB: ieee80211_encap does not include 802.11 header */ 477 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 478 479 /* 480 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 481 * present by setting the sa_len field of the sockaddr (yes, 482 * this is a hack). 483 * NB: we assume sa_data is suitably aligned to cast. 484 */ 485 return vap->iv_ic->ic_raw_xmit(ni, m, 486 (const struct ieee80211_bpf_params *)(dst->sa_len ? 487 dst->sa_data : NULL)); 488 bad: 489 if (m != NULL) 490 m_freem(m); 491 if (ni != NULL) 492 ieee80211_free_node(ni); 493 ifp->if_oerrors++; 494 return error; 495 #undef senderr 496 } 497 498 /* 499 * Set the direction field and address fields of an outgoing 500 * frame. Note this should be called early on in constructing 501 * a frame as it sets i_fc[1]; other bits can then be or'd in. 502 */ 503 void 504 ieee80211_send_setup( 505 struct ieee80211_node *ni, 506 struct mbuf *m, 507 int type, int tid, 508 const uint8_t sa[IEEE80211_ADDR_LEN], 509 const uint8_t da[IEEE80211_ADDR_LEN], 510 const uint8_t bssid[IEEE80211_ADDR_LEN]) 511 { 512 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 513 struct ieee80211vap *vap = ni->ni_vap; 514 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 515 ieee80211_seq seqno; 516 517 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 518 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 519 switch (vap->iv_opmode) { 520 case IEEE80211_M_STA: 521 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 522 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 523 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 524 IEEE80211_ADDR_COPY(wh->i_addr3, da); 525 break; 526 case IEEE80211_M_IBSS: 527 case IEEE80211_M_AHDEMO: 528 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 529 IEEE80211_ADDR_COPY(wh->i_addr1, da); 530 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 531 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 532 break; 533 case IEEE80211_M_HOSTAP: 534 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 535 IEEE80211_ADDR_COPY(wh->i_addr1, da); 536 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 537 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 538 break; 539 case IEEE80211_M_WDS: 540 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 541 IEEE80211_ADDR_COPY(wh->i_addr1, da); 542 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 543 IEEE80211_ADDR_COPY(wh->i_addr3, da); 544 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 545 break; 546 case IEEE80211_M_MBSS: 547 #ifdef IEEE80211_SUPPORT_MESH 548 /* XXX add support for proxied addresses */ 549 if (IEEE80211_IS_MULTICAST(da)) { 550 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 551 /* XXX next hop */ 552 IEEE80211_ADDR_COPY(wh->i_addr1, da); 553 IEEE80211_ADDR_COPY(wh->i_addr2, 554 vap->iv_myaddr); 555 } else { 556 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 557 IEEE80211_ADDR_COPY(wh->i_addr1, da); 558 IEEE80211_ADDR_COPY(wh->i_addr2, 559 vap->iv_myaddr); 560 IEEE80211_ADDR_COPY(wh->i_addr3, da); 561 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 562 } 563 #endif 564 break; 565 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 566 break; 567 } 568 } else { 569 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 570 IEEE80211_ADDR_COPY(wh->i_addr1, da); 571 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 572 #ifdef IEEE80211_SUPPORT_MESH 573 if (vap->iv_opmode == IEEE80211_M_MBSS) 574 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 575 else 576 #endif 577 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 578 } 579 *(uint16_t *)&wh->i_dur[0] = 0; 580 581 seqno = ni->ni_txseqs[tid]++; 582 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 583 M_SEQNO_SET(m, seqno); 584 585 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 586 m->m_flags |= M_MCAST; 587 #undef WH4 588 } 589 590 /* 591 * Send a management frame to the specified node. The node pointer 592 * must have a reference as the pointer will be passed to the driver 593 * and potentially held for a long time. If the frame is successfully 594 * dispatched to the driver, then it is responsible for freeing the 595 * reference (and potentially free'ing up any associated storage); 596 * otherwise deal with reclaiming any reference (on error). 597 */ 598 int 599 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 600 struct ieee80211_bpf_params *params) 601 { 602 struct ieee80211vap *vap = ni->ni_vap; 603 struct ieee80211com *ic = ni->ni_ic; 604 struct ieee80211_frame *wh; 605 606 KASSERT(ni != NULL, ("null node")); 607 608 if (vap->iv_state == IEEE80211_S_CAC) { 609 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 610 ni, "block %s frame in CAC state", 611 ieee80211_mgt_subtype_name[ 612 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 613 IEEE80211_FC0_SUBTYPE_SHIFT]); 614 vap->iv_stats.is_tx_badstate++; 615 ieee80211_free_node(ni); 616 m_freem(m); 617 return EIO; /* XXX */ 618 } 619 620 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 621 if (m == NULL) { 622 ieee80211_free_node(ni); 623 return ENOMEM; 624 } 625 626 wh = mtod(m, struct ieee80211_frame *); 627 ieee80211_send_setup(ni, m, 628 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 629 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 630 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 631 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 632 "encrypting frame (%s)", __func__); 633 wh->i_fc[1] |= IEEE80211_FC1_WEP; 634 } 635 m->m_flags |= M_ENCAP; /* mark encapsulated */ 636 637 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 638 M_WME_SETAC(m, params->ibp_pri); 639 640 #ifdef IEEE80211_DEBUG 641 /* avoid printing too many frames */ 642 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 643 ieee80211_msg_dumppkts(vap)) { 644 kprintf("[%6D] send %s on channel %u\n", 645 wh->i_addr1, ":", 646 ieee80211_mgt_subtype_name[ 647 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 648 IEEE80211_FC0_SUBTYPE_SHIFT], 649 ieee80211_chan2ieee(ic, ic->ic_curchan)); 650 } 651 #endif 652 IEEE80211_NODE_STAT(ni, tx_mgmt); 653 654 return ic->ic_raw_xmit(ni, m, params); 655 } 656 657 /* 658 * Send a null data frame to the specified node. If the station 659 * is setup for QoS then a QoS Null Data frame is constructed. 660 * If this is a WDS station then a 4-address frame is constructed. 661 * 662 * NB: the caller is assumed to have setup a node reference 663 * for use; this is necessary to deal with a race condition 664 * when probing for inactive stations. Like ieee80211_mgmt_output 665 * we must cleanup any node reference on error; however we 666 * can safely just unref it as we know it will never be the 667 * last reference to the node. 668 */ 669 int 670 ieee80211_send_nulldata(struct ieee80211_node *ni) 671 { 672 struct ieee80211vap *vap = ni->ni_vap; 673 struct ieee80211com *ic = ni->ni_ic; 674 struct mbuf *m; 675 struct ieee80211_frame *wh; 676 int hdrlen; 677 uint8_t *frm; 678 679 if (vap->iv_state == IEEE80211_S_CAC) { 680 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 681 ni, "block %s frame in CAC state", "null data"); 682 ieee80211_unref_node(&ni); 683 vap->iv_stats.is_tx_badstate++; 684 return EIO; /* XXX */ 685 } 686 687 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 688 hdrlen = sizeof(struct ieee80211_qosframe); 689 else 690 hdrlen = sizeof(struct ieee80211_frame); 691 /* NB: only WDS vap's get 4-address frames */ 692 if (vap->iv_opmode == IEEE80211_M_WDS) 693 hdrlen += IEEE80211_ADDR_LEN; 694 if (ic->ic_flags & IEEE80211_F_DATAPAD) 695 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 696 697 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 698 if (m == NULL) { 699 /* XXX debug msg */ 700 ieee80211_unref_node(&ni); 701 vap->iv_stats.is_tx_nobuf++; 702 return ENOMEM; 703 } 704 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 705 ("leading space %zd", M_LEADINGSPACE(m))); 706 M_PREPEND(m, hdrlen, MB_DONTWAIT); 707 if (m == NULL) { 708 /* NB: cannot happen */ 709 ieee80211_free_node(ni); 710 return ENOMEM; 711 } 712 713 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 714 if (ni->ni_flags & IEEE80211_NODE_QOS) { 715 const int tid = WME_AC_TO_TID(WME_AC_BE); 716 uint8_t *qos; 717 718 ieee80211_send_setup(ni, m, 719 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 720 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 721 722 if (vap->iv_opmode == IEEE80211_M_WDS) 723 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 724 else 725 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 726 qos[0] = tid & IEEE80211_QOS_TID; 727 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 728 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 729 qos[1] = 0; 730 } else { 731 ieee80211_send_setup(ni, m, 732 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 733 IEEE80211_NONQOS_TID, 734 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 735 } 736 if (vap->iv_opmode != IEEE80211_M_WDS) { 737 /* NB: power management bit is never sent by an AP */ 738 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 739 vap->iv_opmode != IEEE80211_M_HOSTAP) 740 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 741 } 742 m->m_len = m->m_pkthdr.len = hdrlen; 743 m->m_flags |= M_ENCAP; /* mark encapsulated */ 744 745 M_WME_SETAC(m, WME_AC_BE); 746 747 IEEE80211_NODE_STAT(ni, tx_data); 748 749 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 750 "send %snull data frame on channel %u, pwr mgt %s", 751 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 752 ieee80211_chan2ieee(ic, ic->ic_curchan), 753 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 754 755 return ic->ic_raw_xmit(ni, m, NULL); 756 } 757 758 /* 759 * Assign priority to a frame based on any vlan tag assigned 760 * to the station and/or any Diffserv setting in an IP header. 761 * Finally, if an ACM policy is setup (in station mode) it's 762 * applied. 763 */ 764 int 765 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 766 { 767 const struct ether_header *eh = mtod(m, struct ether_header *); 768 int v_wme_ac, d_wme_ac, ac; 769 770 /* 771 * Always promote PAE/EAPOL frames to high priority. 772 */ 773 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 774 /* NB: mark so others don't need to check header */ 775 m->m_flags |= M_EAPOL; 776 ac = WME_AC_VO; 777 goto done; 778 } 779 /* 780 * Non-qos traffic goes to BE. 781 */ 782 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 783 ac = WME_AC_BE; 784 goto done; 785 } 786 787 /* 788 * If node has a vlan tag then all traffic 789 * to it must have a matching tag. 790 */ 791 v_wme_ac = 0; 792 if (ni->ni_vlan != 0) { 793 if ((m->m_flags & M_VLANTAG) == 0) { 794 IEEE80211_NODE_STAT(ni, tx_novlantag); 795 return 1; 796 } 797 #ifdef __FreeBSD__ 798 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 799 EVL_VLANOFTAG(ni->ni_vlan)) { 800 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 801 return 1; 802 } 803 /* map vlan priority to AC */ 804 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 805 #endif 806 } 807 808 /* XXX m_copydata may be too slow for fast path */ 809 #ifdef INET 810 if (eh->ether_type == htons(ETHERTYPE_IP)) { 811 uint8_t tos; 812 /* 813 * IP frame, map the DSCP bits from the TOS field. 814 */ 815 /* NB: ip header may not be in first mbuf */ 816 m_copydata(m, sizeof(struct ether_header) + 817 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 818 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 819 d_wme_ac = TID_TO_WME_AC(tos); 820 } else { 821 #endif /* INET */ 822 #ifdef INET6 823 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 824 uint32_t flow; 825 uint8_t tos; 826 /* 827 * IPv6 frame, map the DSCP bits from the TOS field. 828 */ 829 m_copydata(m, sizeof(struct ether_header) + 830 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 831 (caddr_t) &flow); 832 tos = (uint8_t)(ntohl(flow) >> 20); 833 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 834 d_wme_ac = TID_TO_WME_AC(tos); 835 } else { 836 #endif /* INET6 */ 837 d_wme_ac = WME_AC_BE; 838 #ifdef INET6 839 } 840 #endif 841 #ifdef INET 842 } 843 #endif 844 /* 845 * Use highest priority AC. 846 */ 847 if (v_wme_ac > d_wme_ac) 848 ac = v_wme_ac; 849 else 850 ac = d_wme_ac; 851 852 /* 853 * Apply ACM policy. 854 */ 855 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 856 static const int acmap[4] = { 857 WME_AC_BK, /* WME_AC_BE */ 858 WME_AC_BK, /* WME_AC_BK */ 859 WME_AC_BE, /* WME_AC_VI */ 860 WME_AC_VI, /* WME_AC_VO */ 861 }; 862 struct ieee80211com *ic = ni->ni_ic; 863 864 while (ac != WME_AC_BK && 865 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 866 ac = acmap[ac]; 867 } 868 done: 869 M_WME_SETAC(m, ac); 870 return 0; 871 } 872 873 /* 874 * Insure there is sufficient contiguous space to encapsulate the 875 * 802.11 data frame. If room isn't already there, arrange for it. 876 * Drivers and cipher modules assume we have done the necessary work 877 * and fail rudely if they don't find the space they need. 878 */ 879 struct mbuf * 880 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 881 struct ieee80211_key *key, struct mbuf *m) 882 { 883 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 884 struct mbuf *mnew = NULL; 885 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 886 887 if (key != NULL) { 888 /* XXX belongs in crypto code? */ 889 needed_space += key->wk_cipher->ic_header; 890 /* XXX frags */ 891 /* 892 * When crypto is being done in the host we must insure 893 * the data are writable for the cipher routines; clone 894 * a writable mbuf chain. 895 * XXX handle SWMIC specially 896 */ 897 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 898 mnew = m_dup(m, MB_DONTWAIT); 899 if (m == NULL) { 900 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 901 "%s: cannot get writable mbuf\n", __func__); 902 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 903 return NULL; 904 } 905 m_freem(m); 906 m = mnew; 907 } 908 } 909 /* 910 * We know we are called just before stripping an Ethernet 911 * header and prepending an LLC header. This means we know 912 * there will be 913 * sizeof(struct ether_header) - sizeof(struct llc) 914 * bytes recovered to which we need additional space for the 915 * 802.11 header and any crypto header. 916 */ 917 /* XXX check trailing space and copy instead? */ 918 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 919 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type); 920 if (n == NULL) { 921 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 922 "%s: cannot expand storage\n", __func__); 923 vap->iv_stats.is_tx_nobuf++; 924 m_freem(m); 925 return NULL; 926 } 927 KASSERT(needed_space <= MHLEN, 928 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 929 /* 930 * Setup new mbuf to have leading space to prepend the 931 * 802.11 header and any crypto header bits that are 932 * required (the latter are added when the driver calls 933 * back to ieee80211_crypto_encap to do crypto encapsulation). 934 */ 935 /* NB: must be first 'cuz it clobbers m_data */ 936 m_move_pkthdr(n, m); 937 n->m_len = 0; /* NB: m_gethdr does not set */ 938 n->m_data += needed_space; 939 /* 940 * Pull up Ethernet header to create the expected layout. 941 * We could use m_pullup but that's overkill (i.e. we don't 942 * need the actual data) and it cannot fail so do it inline 943 * for speed. 944 */ 945 /* NB: struct ether_header is known to be contiguous */ 946 n->m_len += sizeof(struct ether_header); 947 m->m_len -= sizeof(struct ether_header); 948 m->m_data += sizeof(struct ether_header); 949 /* 950 * Replace the head of the chain. 951 */ 952 n->m_next = m; 953 m = n; 954 } 955 return m; 956 #undef TO_BE_RECLAIMED 957 } 958 959 /* 960 * Return the transmit key to use in sending a unicast frame. 961 * If a unicast key is set we use that. When no unicast key is set 962 * we fall back to the default transmit key. 963 */ 964 static __inline struct ieee80211_key * 965 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 966 struct ieee80211_node *ni) 967 { 968 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 969 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 970 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 971 return NULL; 972 return &vap->iv_nw_keys[vap->iv_def_txkey]; 973 } else { 974 return &ni->ni_ucastkey; 975 } 976 } 977 978 /* 979 * Return the transmit key to use in sending a multicast frame. 980 * Multicast traffic always uses the group key which is installed as 981 * the default tx key. 982 */ 983 static __inline struct ieee80211_key * 984 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 985 struct ieee80211_node *ni) 986 { 987 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 988 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 989 return NULL; 990 return &vap->iv_nw_keys[vap->iv_def_txkey]; 991 } 992 993 /* 994 * Encapsulate an outbound data frame. The mbuf chain is updated. 995 * If an error is encountered NULL is returned. The caller is required 996 * to provide a node reference and pullup the ethernet header in the 997 * first mbuf. 998 * 999 * NB: Packet is assumed to be processed by ieee80211_classify which 1000 * marked EAPOL frames w/ M_EAPOL. 1001 */ 1002 struct mbuf * 1003 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1004 struct mbuf *m) 1005 { 1006 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1007 struct ieee80211com *ic = ni->ni_ic; 1008 #ifdef IEEE80211_SUPPORT_MESH 1009 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1010 struct ieee80211_meshcntl_ae10 *mc; 1011 #endif 1012 struct ether_header eh; 1013 struct ieee80211_frame *wh; 1014 struct ieee80211_key *key; 1015 struct llc *llc; 1016 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1017 ieee80211_seq seqno; 1018 int meshhdrsize, meshae; 1019 uint8_t *qos; 1020 1021 /* 1022 * Copy existing Ethernet header to a safe place. The 1023 * rest of the code assumes it's ok to strip it when 1024 * reorganizing state for the final encapsulation. 1025 */ 1026 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1027 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1028 1029 /* 1030 * Insure space for additional headers. First identify 1031 * transmit key to use in calculating any buffer adjustments 1032 * required. This is also used below to do privacy 1033 * encapsulation work. Then calculate the 802.11 header 1034 * size and any padding required by the driver. 1035 * 1036 * Note key may be NULL if we fall back to the default 1037 * transmit key and that is not set. In that case the 1038 * buffer may not be expanded as needed by the cipher 1039 * routines, but they will/should discard it. 1040 */ 1041 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1042 if (vap->iv_opmode == IEEE80211_M_STA || 1043 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1044 (vap->iv_opmode == IEEE80211_M_WDS && 1045 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1046 key = ieee80211_crypto_getucastkey(vap, ni); 1047 else 1048 key = ieee80211_crypto_getmcastkey(vap, ni); 1049 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1050 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1051 eh.ether_dhost, 1052 "no default transmit key (%s) deftxkey %u", 1053 __func__, vap->iv_def_txkey); 1054 vap->iv_stats.is_tx_nodefkey++; 1055 goto bad; 1056 } 1057 } else 1058 key = NULL; 1059 /* 1060 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1061 * frames so suppress use. This may be an issue if other 1062 * ap's require all data frames to be QoS-encapsulated 1063 * once negotiated in which case we'll need to make this 1064 * configurable. 1065 */ 1066 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1067 (m->m_flags & M_EAPOL) == 0; 1068 if (addqos) 1069 hdrsize = sizeof(struct ieee80211_qosframe); 1070 else 1071 hdrsize = sizeof(struct ieee80211_frame); 1072 #ifdef IEEE80211_SUPPORT_MESH 1073 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1074 /* 1075 * Mesh data frames are encapsulated according to the 1076 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1077 * o Group Addressed data (aka multicast) originating 1078 * at the local sta are sent w/ 3-address format and 1079 * address extension mode 00 1080 * o Individually Addressed data (aka unicast) originating 1081 * at the local sta are sent w/ 4-address format and 1082 * address extension mode 00 1083 * o Group Addressed data forwarded from a non-mesh sta are 1084 * sent w/ 3-address format and address extension mode 01 1085 * o Individually Address data from another sta are sent 1086 * w/ 4-address format and address extension mode 10 1087 */ 1088 is4addr = 0; /* NB: don't use, disable */ 1089 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1090 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1091 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1092 /* XXX defines for AE modes */ 1093 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1094 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1095 meshae = 0; 1096 else 1097 meshae = 4; /* NB: pseudo */ 1098 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1099 meshae = 1; 1100 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1101 } else { 1102 meshae = 2; 1103 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1104 } 1105 } else { 1106 #endif 1107 /* 1108 * 4-address frames need to be generated for: 1109 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1110 * o packets sent through a vap marked for relaying 1111 * (e.g. a station operating with dynamic WDS) 1112 */ 1113 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1114 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1115 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1116 if (is4addr) 1117 hdrsize += IEEE80211_ADDR_LEN; 1118 meshhdrsize = meshae = 0; 1119 #ifdef IEEE80211_SUPPORT_MESH 1120 } 1121 #endif 1122 /* 1123 * Honor driver DATAPAD requirement. 1124 */ 1125 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1126 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1127 else 1128 hdrspace = hdrsize; 1129 1130 if (__predict_true((m->m_flags & M_FF) == 0)) { 1131 /* 1132 * Normal frame. 1133 */ 1134 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1135 if (m == NULL) { 1136 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1137 goto bad; 1138 } 1139 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1140 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1141 llc = mtod(m, struct llc *); 1142 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1143 llc->llc_control = LLC_UI; 1144 llc->llc_snap.org_code[0] = 0; 1145 llc->llc_snap.org_code[1] = 0; 1146 llc->llc_snap.org_code[2] = 0; 1147 llc->llc_snap.ether_type = eh.ether_type; 1148 } else { 1149 #ifdef IEEE80211_SUPPORT_SUPERG 1150 /* 1151 * Aggregated frame. 1152 */ 1153 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1154 if (m == NULL) 1155 #endif 1156 goto bad; 1157 } 1158 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1159 1160 M_PREPEND(m, hdrspace + meshhdrsize, MB_DONTWAIT); 1161 if (m == NULL) { 1162 vap->iv_stats.is_tx_nobuf++; 1163 goto bad; 1164 } 1165 wh = mtod(m, struct ieee80211_frame *); 1166 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1167 *(uint16_t *)wh->i_dur = 0; 1168 qos = NULL; /* NB: quiet compiler */ 1169 if (is4addr) { 1170 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1171 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1172 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1173 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1174 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1175 } else switch (vap->iv_opmode) { 1176 case IEEE80211_M_STA: 1177 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1178 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1179 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1180 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1181 break; 1182 case IEEE80211_M_IBSS: 1183 case IEEE80211_M_AHDEMO: 1184 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1185 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1186 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1187 /* 1188 * NB: always use the bssid from iv_bss as the 1189 * neighbor's may be stale after an ibss merge 1190 */ 1191 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1192 break; 1193 case IEEE80211_M_HOSTAP: 1194 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1195 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1196 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1197 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1198 break; 1199 #ifdef IEEE80211_SUPPORT_MESH 1200 case IEEE80211_M_MBSS: 1201 /* NB: offset by hdrspace to deal with DATAPAD */ 1202 mc = (struct ieee80211_meshcntl_ae10 *) 1203 (mtod(m, uint8_t *) + hdrspace); 1204 switch (meshae) { 1205 case 0: /* ucast, no proxy */ 1206 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1207 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1208 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1209 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1210 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1211 mc->mc_flags = 0; 1212 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1213 break; 1214 case 4: /* mcast, no proxy */ 1215 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1216 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1217 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1218 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1219 mc->mc_flags = 0; /* NB: AE is really 0 */ 1220 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1221 break; 1222 case 1: /* mcast, proxy */ 1223 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1224 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1225 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1226 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1227 mc->mc_flags = 1; 1228 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1229 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1230 break; 1231 case 2: /* ucast, proxy */ 1232 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1233 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1234 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1235 /* XXX not right, need MeshDA */ 1236 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1237 /* XXX assume are MeshSA */ 1238 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1239 mc->mc_flags = 2; 1240 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1241 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1242 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1243 break; 1244 default: 1245 KASSERT(0, ("meshae %d", meshae)); 1246 break; 1247 } 1248 mc->mc_ttl = ms->ms_ttl; 1249 ms->ms_seq++; 1250 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1251 break; 1252 #endif 1253 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1254 default: 1255 goto bad; 1256 } 1257 if (m->m_flags & M_MORE_DATA) 1258 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1259 if (addqos) { 1260 int ac, tid; 1261 1262 if (is4addr) { 1263 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1264 /* NB: mesh case handled earlier */ 1265 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1266 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1267 ac = M_WME_GETAC(m); 1268 /* map from access class/queue to 11e header priorty value */ 1269 tid = WME_AC_TO_TID(ac); 1270 qos[0] = tid & IEEE80211_QOS_TID; 1271 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1272 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1273 qos[1] = 0; 1274 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1275 1276 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1277 /* 1278 * NB: don't assign a sequence # to potential 1279 * aggregates; we expect this happens at the 1280 * point the frame comes off any aggregation q 1281 * as otherwise we may introduce holes in the 1282 * BA sequence space and/or make window accouting 1283 * more difficult. 1284 * 1285 * XXX may want to control this with a driver 1286 * capability; this may also change when we pull 1287 * aggregation up into net80211 1288 */ 1289 seqno = ni->ni_txseqs[tid]++; 1290 *(uint16_t *)wh->i_seq = 1291 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1292 M_SEQNO_SET(m, seqno); 1293 } 1294 } else { 1295 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1296 *(uint16_t *)wh->i_seq = 1297 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1298 M_SEQNO_SET(m, seqno); 1299 } 1300 1301 1302 /* check if xmit fragmentation is required */ 1303 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1304 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1305 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1306 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1307 if (key != NULL) { 1308 /* 1309 * IEEE 802.1X: send EAPOL frames always in the clear. 1310 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1311 */ 1312 if ((m->m_flags & M_EAPOL) == 0 || 1313 ((vap->iv_flags & IEEE80211_F_WPA) && 1314 (vap->iv_opmode == IEEE80211_M_STA ? 1315 !IEEE80211_KEY_UNDEFINED(key) : 1316 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1317 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1318 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1319 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1320 eh.ether_dhost, 1321 "%s", "enmic failed, discard frame"); 1322 vap->iv_stats.is_crypto_enmicfail++; 1323 goto bad; 1324 } 1325 } 1326 } 1327 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1328 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1329 goto bad; 1330 1331 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1332 1333 IEEE80211_NODE_STAT(ni, tx_data); 1334 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1335 IEEE80211_NODE_STAT(ni, tx_mcast); 1336 m->m_flags |= M_MCAST; 1337 } else 1338 IEEE80211_NODE_STAT(ni, tx_ucast); 1339 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1340 1341 return m; 1342 bad: 1343 if (m != NULL) 1344 m_freem(m); 1345 return NULL; 1346 #undef WH4 1347 } 1348 1349 /* 1350 * Fragment the frame according to the specified mtu. 1351 * The size of the 802.11 header (w/o padding) is provided 1352 * so we don't need to recalculate it. We create a new 1353 * mbuf for each fragment and chain it through m_nextpkt; 1354 * we might be able to optimize this by reusing the original 1355 * packet's mbufs but that is significantly more complicated. 1356 */ 1357 static int 1358 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1359 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1360 { 1361 struct ieee80211_frame *wh, *whf; 1362 struct mbuf *m, *prev, *next; 1363 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1364 1365 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1366 KASSERT(m0->m_pkthdr.len > mtu, 1367 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1368 1369 wh = mtod(m0, struct ieee80211_frame *); 1370 /* NB: mark the first frag; it will be propagated below */ 1371 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1372 totalhdrsize = hdrsize + ciphdrsize; 1373 fragno = 1; 1374 off = mtu - ciphdrsize; 1375 remainder = m0->m_pkthdr.len - off; 1376 prev = m0; 1377 do { 1378 fragsize = totalhdrsize + remainder; 1379 if (fragsize > mtu) 1380 fragsize = mtu; 1381 /* XXX fragsize can be >2048! */ 1382 KASSERT(fragsize < MCLBYTES, 1383 ("fragment size %u too big!", fragsize)); 1384 if (fragsize > MHLEN) 1385 m = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR); 1386 else 1387 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1388 if (m == NULL) 1389 goto bad; 1390 /* leave room to prepend any cipher header */ 1391 m_align(m, fragsize - ciphdrsize); 1392 1393 /* 1394 * Form the header in the fragment. Note that since 1395 * we mark the first fragment with the MORE_FRAG bit 1396 * it automatically is propagated to each fragment; we 1397 * need only clear it on the last fragment (done below). 1398 */ 1399 whf = mtod(m, struct ieee80211_frame *); 1400 memcpy(whf, wh, hdrsize); 1401 *(uint16_t *)&whf->i_seq[0] |= htole16( 1402 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1403 IEEE80211_SEQ_FRAG_SHIFT); 1404 fragno++; 1405 1406 payload = fragsize - totalhdrsize; 1407 /* NB: destination is known to be contiguous */ 1408 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1409 m->m_len = hdrsize + payload; 1410 m->m_pkthdr.len = hdrsize + payload; 1411 m->m_flags |= M_FRAG; 1412 m->m_pkthdr.rcvif = m0->m_pkthdr.rcvif; 1413 1414 /* chain up the fragment */ 1415 prev->m_nextpkt = m; 1416 prev = m; 1417 1418 /* deduct fragment just formed */ 1419 remainder -= payload; 1420 off += payload; 1421 } while (remainder != 0); 1422 1423 /* set the last fragment */ 1424 m->m_flags |= M_LASTFRAG; 1425 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1426 1427 /* strip first mbuf now that everything has been copied */ 1428 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1429 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1430 1431 vap->iv_stats.is_tx_fragframes++; 1432 vap->iv_stats.is_tx_frags += fragno-1; 1433 1434 return 1; 1435 bad: 1436 /* reclaim fragments but leave original frame for caller to free */ 1437 for (m = m0->m_nextpkt; m != NULL; m = next) { 1438 next = m->m_nextpkt; 1439 m->m_nextpkt = NULL; /* XXX paranoid */ 1440 m_freem(m); 1441 } 1442 m0->m_nextpkt = NULL; 1443 return 0; 1444 } 1445 1446 /* 1447 * Add a supported rates element id to a frame. 1448 */ 1449 uint8_t * 1450 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1451 { 1452 int nrates; 1453 1454 *frm++ = IEEE80211_ELEMID_RATES; 1455 nrates = rs->rs_nrates; 1456 if (nrates > IEEE80211_RATE_SIZE) 1457 nrates = IEEE80211_RATE_SIZE; 1458 *frm++ = nrates; 1459 memcpy(frm, rs->rs_rates, nrates); 1460 return frm + nrates; 1461 } 1462 1463 /* 1464 * Add an extended supported rates element id to a frame. 1465 */ 1466 uint8_t * 1467 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1468 { 1469 /* 1470 * Add an extended supported rates element if operating in 11g mode. 1471 */ 1472 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1473 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1474 *frm++ = IEEE80211_ELEMID_XRATES; 1475 *frm++ = nrates; 1476 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1477 frm += nrates; 1478 } 1479 return frm; 1480 } 1481 1482 /* 1483 * Add an ssid element to a frame. 1484 */ 1485 static uint8_t * 1486 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1487 { 1488 *frm++ = IEEE80211_ELEMID_SSID; 1489 *frm++ = len; 1490 memcpy(frm, ssid, len); 1491 return frm + len; 1492 } 1493 1494 /* 1495 * Add an erp element to a frame. 1496 */ 1497 static uint8_t * 1498 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1499 { 1500 uint8_t erp; 1501 1502 *frm++ = IEEE80211_ELEMID_ERP; 1503 *frm++ = 1; 1504 erp = 0; 1505 if (ic->ic_nonerpsta != 0) 1506 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1507 if (ic->ic_flags & IEEE80211_F_USEPROT) 1508 erp |= IEEE80211_ERP_USE_PROTECTION; 1509 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1510 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1511 *frm++ = erp; 1512 return frm; 1513 } 1514 1515 /* 1516 * Add a CFParams element to a frame. 1517 */ 1518 static uint8_t * 1519 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1520 { 1521 #define ADDSHORT(frm, v) do { \ 1522 LE_WRITE_2(frm, v); \ 1523 frm += 2; \ 1524 } while (0) 1525 *frm++ = IEEE80211_ELEMID_CFPARMS; 1526 *frm++ = 6; 1527 *frm++ = 0; /* CFP count */ 1528 *frm++ = 2; /* CFP period */ 1529 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1530 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1531 return frm; 1532 #undef ADDSHORT 1533 } 1534 1535 static __inline uint8_t * 1536 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1537 { 1538 memcpy(frm, ie->ie_data, ie->ie_len); 1539 return frm + ie->ie_len; 1540 } 1541 1542 static __inline uint8_t * 1543 add_ie(uint8_t *frm, const uint8_t *ie) 1544 { 1545 memcpy(frm, ie, 2 + ie[1]); 1546 return frm + 2 + ie[1]; 1547 } 1548 1549 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1550 /* 1551 * Add a WME information element to a frame. 1552 */ 1553 static uint8_t * 1554 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1555 { 1556 static const struct ieee80211_wme_info info = { 1557 .wme_id = IEEE80211_ELEMID_VENDOR, 1558 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1559 .wme_oui = { WME_OUI_BYTES }, 1560 .wme_type = WME_OUI_TYPE, 1561 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1562 .wme_version = WME_VERSION, 1563 .wme_info = 0, 1564 }; 1565 memcpy(frm, &info, sizeof(info)); 1566 return frm + sizeof(info); 1567 } 1568 1569 /* 1570 * Add a WME parameters element to a frame. 1571 */ 1572 static uint8_t * 1573 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1574 { 1575 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1576 #define ADDSHORT(frm, v) do { \ 1577 LE_WRITE_2(frm, v); \ 1578 frm += 2; \ 1579 } while (0) 1580 /* NB: this works 'cuz a param has an info at the front */ 1581 static const struct ieee80211_wme_info param = { 1582 .wme_id = IEEE80211_ELEMID_VENDOR, 1583 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1584 .wme_oui = { WME_OUI_BYTES }, 1585 .wme_type = WME_OUI_TYPE, 1586 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1587 .wme_version = WME_VERSION, 1588 }; 1589 int i; 1590 1591 memcpy(frm, ¶m, sizeof(param)); 1592 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1593 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1594 *frm++ = 0; /* reserved field */ 1595 for (i = 0; i < WME_NUM_AC; i++) { 1596 const struct wmeParams *ac = 1597 &wme->wme_bssChanParams.cap_wmeParams[i]; 1598 *frm++ = SM(i, WME_PARAM_ACI) 1599 | SM(ac->wmep_acm, WME_PARAM_ACM) 1600 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1601 ; 1602 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1603 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1604 ; 1605 ADDSHORT(frm, ac->wmep_txopLimit); 1606 } 1607 return frm; 1608 #undef SM 1609 #undef ADDSHORT 1610 } 1611 #undef WME_OUI_BYTES 1612 1613 /* 1614 * Add an 11h Power Constraint element to a frame. 1615 */ 1616 static uint8_t * 1617 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1618 { 1619 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1620 /* XXX per-vap tx power limit? */ 1621 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1622 1623 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1624 frm[1] = 1; 1625 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1626 return frm + 3; 1627 } 1628 1629 /* 1630 * Add an 11h Power Capability element to a frame. 1631 */ 1632 static uint8_t * 1633 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1634 { 1635 frm[0] = IEEE80211_ELEMID_PWRCAP; 1636 frm[1] = 2; 1637 frm[2] = c->ic_minpower; 1638 frm[3] = c->ic_maxpower; 1639 return frm + 4; 1640 } 1641 1642 /* 1643 * Add an 11h Supported Channels element to a frame. 1644 */ 1645 static uint8_t * 1646 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1647 { 1648 static const int ielen = 26; 1649 1650 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1651 frm[1] = ielen; 1652 /* XXX not correct */ 1653 memcpy(frm+2, ic->ic_chan_avail, ielen); 1654 return frm + 2 + ielen; 1655 } 1656 1657 /* 1658 * Add an 11h Channel Switch Announcement element to a frame. 1659 * Note that we use the per-vap CSA count to adjust the global 1660 * counter so we can use this routine to form probe response 1661 * frames and get the current count. 1662 */ 1663 static uint8_t * 1664 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1665 { 1666 struct ieee80211com *ic = vap->iv_ic; 1667 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1668 1669 csa->csa_ie = IEEE80211_ELEMID_CSA; 1670 csa->csa_len = 3; 1671 csa->csa_mode = 1; /* XXX force quiet on channel */ 1672 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1673 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1674 return frm + sizeof(*csa); 1675 } 1676 1677 /* 1678 * Add an 11h country information element to a frame. 1679 */ 1680 static uint8_t * 1681 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1682 { 1683 1684 if (ic->ic_countryie == NULL || 1685 ic->ic_countryie_chan != ic->ic_bsschan) { 1686 /* 1687 * Handle lazy construction of ie. This is done on 1688 * first use and after a channel change that requires 1689 * re-calculation. 1690 */ 1691 if (ic->ic_countryie != NULL) 1692 kfree(ic->ic_countryie, M_80211_NODE_IE); 1693 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1694 if (ic->ic_countryie == NULL) 1695 return frm; 1696 ic->ic_countryie_chan = ic->ic_bsschan; 1697 } 1698 return add_appie(frm, ic->ic_countryie); 1699 } 1700 1701 /* 1702 * Send a probe request frame with the specified ssid 1703 * and any optional information element data. 1704 */ 1705 int 1706 ieee80211_send_probereq(struct ieee80211_node *ni, 1707 const uint8_t sa[IEEE80211_ADDR_LEN], 1708 const uint8_t da[IEEE80211_ADDR_LEN], 1709 const uint8_t bssid[IEEE80211_ADDR_LEN], 1710 const uint8_t *ssid, size_t ssidlen) 1711 { 1712 struct ieee80211vap *vap = ni->ni_vap; 1713 struct ieee80211com *ic = ni->ni_ic; 1714 const struct ieee80211_txparam *tp; 1715 struct ieee80211_bpf_params params; 1716 struct ieee80211_frame *wh; 1717 const struct ieee80211_rateset *rs; 1718 struct mbuf *m; 1719 uint8_t *frm; 1720 1721 if (vap->iv_state == IEEE80211_S_CAC) { 1722 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1723 "block %s frame in CAC state", "probe request"); 1724 vap->iv_stats.is_tx_badstate++; 1725 return EIO; /* XXX */ 1726 } 1727 1728 /* 1729 * Hold a reference on the node so it doesn't go away until after 1730 * the xmit is complete all the way in the driver. On error we 1731 * will remove our reference. 1732 */ 1733 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1734 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1735 __func__, __LINE__, 1736 ni, ni->ni_macaddr, ":", 1737 ieee80211_node_refcnt(ni)+1); 1738 ieee80211_ref_node(ni); 1739 1740 /* 1741 * prreq frame format 1742 * [tlv] ssid 1743 * [tlv] supported rates 1744 * [tlv] RSN (optional) 1745 * [tlv] extended supported rates 1746 * [tlv] WPA (optional) 1747 * [tlv] user-specified ie's 1748 */ 1749 m = ieee80211_getmgtframe(&frm, 1750 ic->ic_headroom + sizeof(struct ieee80211_frame), 1751 2 + IEEE80211_NWID_LEN 1752 + 2 + IEEE80211_RATE_SIZE 1753 + sizeof(struct ieee80211_ie_wpa) 1754 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1755 + sizeof(struct ieee80211_ie_wpa) 1756 + (vap->iv_appie_probereq != NULL ? 1757 vap->iv_appie_probereq->ie_len : 0) 1758 ); 1759 if (m == NULL) { 1760 vap->iv_stats.is_tx_nobuf++; 1761 ieee80211_free_node(ni); 1762 return ENOMEM; 1763 } 1764 1765 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1766 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1767 frm = ieee80211_add_rates(frm, rs); 1768 if (vap->iv_flags & IEEE80211_F_WPA2) { 1769 if (vap->iv_rsn_ie != NULL) 1770 frm = add_ie(frm, vap->iv_rsn_ie); 1771 /* XXX else complain? */ 1772 } 1773 frm = ieee80211_add_xrates(frm, rs); 1774 if (vap->iv_flags & IEEE80211_F_WPA1) { 1775 if (vap->iv_wpa_ie != NULL) 1776 frm = add_ie(frm, vap->iv_wpa_ie); 1777 /* XXX else complain? */ 1778 } 1779 if (vap->iv_appie_probereq != NULL) 1780 frm = add_appie(frm, vap->iv_appie_probereq); 1781 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1782 1783 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1784 ("leading space %zd", M_LEADINGSPACE(m))); 1785 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1786 if (m == NULL) { 1787 /* NB: cannot happen */ 1788 ieee80211_free_node(ni); 1789 return ENOMEM; 1790 } 1791 1792 wh = mtod(m, struct ieee80211_frame *); 1793 ieee80211_send_setup(ni, m, 1794 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1795 IEEE80211_NONQOS_TID, sa, da, bssid); 1796 /* XXX power management? */ 1797 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1798 1799 M_WME_SETAC(m, WME_AC_BE); 1800 1801 IEEE80211_NODE_STAT(ni, tx_probereq); 1802 IEEE80211_NODE_STAT(ni, tx_mgmt); 1803 1804 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1805 "send probe req on channel %u bssid %6D ssid \"%.*s\"\n", 1806 ieee80211_chan2ieee(ic, ic->ic_curchan), bssid, ":", 1807 (int)ssidlen, ssid); 1808 1809 memset(¶ms, 0, sizeof(params)); 1810 params.ibp_pri = M_WME_GETAC(m); 1811 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1812 params.ibp_rate0 = tp->mgmtrate; 1813 if (IEEE80211_IS_MULTICAST(da)) { 1814 params.ibp_flags |= IEEE80211_BPF_NOACK; 1815 params.ibp_try0 = 1; 1816 } else 1817 params.ibp_try0 = tp->maxretry; 1818 params.ibp_power = ni->ni_txpower; 1819 return ic->ic_raw_xmit(ni, m, ¶ms); 1820 } 1821 1822 /* 1823 * Calculate capability information for mgt frames. 1824 */ 1825 uint16_t 1826 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1827 { 1828 struct ieee80211com *ic = vap->iv_ic; 1829 uint16_t capinfo; 1830 1831 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1832 1833 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1834 capinfo = IEEE80211_CAPINFO_ESS; 1835 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1836 capinfo = IEEE80211_CAPINFO_IBSS; 1837 else 1838 capinfo = 0; 1839 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1840 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1841 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1842 IEEE80211_IS_CHAN_2GHZ(chan)) 1843 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1844 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1845 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1846 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1847 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1848 return capinfo; 1849 } 1850 1851 /* 1852 * Send a management frame. The node is for the destination (or ic_bss 1853 * when in station mode). Nodes other than ic_bss have their reference 1854 * count bumped to reflect our use for an indeterminant time. 1855 */ 1856 int 1857 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1858 { 1859 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1860 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1861 struct ieee80211vap *vap = ni->ni_vap; 1862 struct ieee80211com *ic = ni->ni_ic; 1863 struct ieee80211_node *bss = vap->iv_bss; 1864 struct ieee80211_bpf_params params; 1865 struct mbuf *m; 1866 uint8_t *frm; 1867 uint16_t capinfo; 1868 int has_challenge, is_shared_key, ret, status; 1869 1870 KASSERT(ni != NULL, ("null node")); 1871 1872 /* 1873 * Hold a reference on the node so it doesn't go away until after 1874 * the xmit is complete all the way in the driver. On error we 1875 * will remove our reference. 1876 */ 1877 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1878 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 1879 __func__, __LINE__, 1880 ni, ni->ni_macaddr, ":", 1881 ieee80211_node_refcnt(ni)+1); 1882 ieee80211_ref_node(ni); 1883 1884 memset(¶ms, 0, sizeof(params)); 1885 switch (type) { 1886 1887 case IEEE80211_FC0_SUBTYPE_AUTH: 1888 status = arg >> 16; 1889 arg &= 0xffff; 1890 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1891 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1892 ni->ni_challenge != NULL); 1893 1894 /* 1895 * Deduce whether we're doing open authentication or 1896 * shared key authentication. We do the latter if 1897 * we're in the middle of a shared key authentication 1898 * handshake or if we're initiating an authentication 1899 * request and configured to use shared key. 1900 */ 1901 is_shared_key = has_challenge || 1902 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1903 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1904 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1905 1906 m = ieee80211_getmgtframe(&frm, 1907 ic->ic_headroom + sizeof(struct ieee80211_frame), 1908 3 * sizeof(uint16_t) 1909 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1910 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1911 ); 1912 if (m == NULL) 1913 senderr(ENOMEM, is_tx_nobuf); 1914 1915 ((uint16_t *)frm)[0] = 1916 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1917 : htole16(IEEE80211_AUTH_ALG_OPEN); 1918 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1919 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1920 1921 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1922 ((uint16_t *)frm)[3] = 1923 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1924 IEEE80211_ELEMID_CHALLENGE); 1925 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1926 IEEE80211_CHALLENGE_LEN); 1927 m->m_pkthdr.len = m->m_len = 1928 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1929 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1930 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1931 "request encrypt frame (%s)", __func__); 1932 /* mark frame for encryption */ 1933 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1934 } 1935 } else 1936 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1937 1938 /* XXX not right for shared key */ 1939 if (status == IEEE80211_STATUS_SUCCESS) 1940 IEEE80211_NODE_STAT(ni, tx_auth); 1941 else 1942 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1943 1944 if (vap->iv_opmode == IEEE80211_M_STA) 1945 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1946 (void *) vap->iv_state); 1947 break; 1948 1949 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1950 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1951 "send station deauthenticate (reason %d)", arg); 1952 m = ieee80211_getmgtframe(&frm, 1953 ic->ic_headroom + sizeof(struct ieee80211_frame), 1954 sizeof(uint16_t)); 1955 if (m == NULL) 1956 senderr(ENOMEM, is_tx_nobuf); 1957 *(uint16_t *)frm = htole16(arg); /* reason */ 1958 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1959 1960 IEEE80211_NODE_STAT(ni, tx_deauth); 1961 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1962 1963 ieee80211_node_unauthorize(ni); /* port closed */ 1964 break; 1965 1966 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1967 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1968 /* 1969 * asreq frame format 1970 * [2] capability information 1971 * [2] listen interval 1972 * [6*] current AP address (reassoc only) 1973 * [tlv] ssid 1974 * [tlv] supported rates 1975 * [tlv] extended supported rates 1976 * [4] power capability (optional) 1977 * [28] supported channels (optional) 1978 * [tlv] HT capabilities 1979 * [tlv] WME (optional) 1980 * [tlv] Vendor OUI HT capabilities (optional) 1981 * [tlv] Atheros capabilities (if negotiated) 1982 * [tlv] AppIE's (optional) 1983 */ 1984 m = ieee80211_getmgtframe(&frm, 1985 ic->ic_headroom + sizeof(struct ieee80211_frame), 1986 sizeof(uint16_t) 1987 + sizeof(uint16_t) 1988 + IEEE80211_ADDR_LEN 1989 + 2 + IEEE80211_NWID_LEN 1990 + 2 + IEEE80211_RATE_SIZE 1991 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1992 + 4 1993 + 2 + 26 1994 + sizeof(struct ieee80211_wme_info) 1995 + sizeof(struct ieee80211_ie_htcap) 1996 + 4 + sizeof(struct ieee80211_ie_htcap) 1997 #ifdef IEEE80211_SUPPORT_SUPERG 1998 + sizeof(struct ieee80211_ath_ie) 1999 #endif 2000 + (vap->iv_appie_wpa != NULL ? 2001 vap->iv_appie_wpa->ie_len : 0) 2002 + (vap->iv_appie_assocreq != NULL ? 2003 vap->iv_appie_assocreq->ie_len : 0) 2004 ); 2005 if (m == NULL) 2006 senderr(ENOMEM, is_tx_nobuf); 2007 2008 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2009 ("wrong mode %u", vap->iv_opmode)); 2010 capinfo = IEEE80211_CAPINFO_ESS; 2011 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2012 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2013 /* 2014 * NB: Some 11a AP's reject the request when 2015 * short premable is set. 2016 */ 2017 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2018 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2019 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2020 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2021 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2022 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2023 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2024 (vap->iv_flags & IEEE80211_F_DOTH)) 2025 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2026 *(uint16_t *)frm = htole16(capinfo); 2027 frm += 2; 2028 2029 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2030 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2031 bss->ni_intval)); 2032 frm += 2; 2033 2034 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2035 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2036 frm += IEEE80211_ADDR_LEN; 2037 } 2038 2039 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2040 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2041 if (vap->iv_flags & IEEE80211_F_WPA2) { 2042 if (vap->iv_rsn_ie != NULL) 2043 frm = add_ie(frm, vap->iv_rsn_ie); 2044 /* XXX else complain? */ 2045 } 2046 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2047 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2048 frm = ieee80211_add_powercapability(frm, 2049 ic->ic_curchan); 2050 frm = ieee80211_add_supportedchannels(frm, ic); 2051 } 2052 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2053 ni->ni_ies.htcap_ie != NULL && 2054 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2055 frm = ieee80211_add_htcap(frm, ni); 2056 if (vap->iv_flags & IEEE80211_F_WPA1) { 2057 if (vap->iv_wpa_ie != NULL) 2058 frm = add_ie(frm, vap->iv_wpa_ie); 2059 /* XXX else complain */ 2060 } 2061 if ((ic->ic_flags & IEEE80211_F_WME) && 2062 ni->ni_ies.wme_ie != NULL) 2063 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2064 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2065 ni->ni_ies.htcap_ie != NULL && 2066 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2067 frm = ieee80211_add_htcap_vendor(frm, ni); 2068 #ifdef IEEE80211_SUPPORT_SUPERG 2069 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2070 frm = ieee80211_add_ath(frm, 2071 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2072 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2073 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2074 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2075 } 2076 #endif /* IEEE80211_SUPPORT_SUPERG */ 2077 if (vap->iv_appie_assocreq != NULL) 2078 frm = add_appie(frm, vap->iv_appie_assocreq); 2079 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2080 2081 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2082 (void *) vap->iv_state); 2083 break; 2084 2085 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2086 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2087 /* 2088 * asresp frame format 2089 * [2] capability information 2090 * [2] status 2091 * [2] association ID 2092 * [tlv] supported rates 2093 * [tlv] extended supported rates 2094 * [tlv] HT capabilities (standard, if STA enabled) 2095 * [tlv] HT information (standard, if STA enabled) 2096 * [tlv] WME (if configured and STA enabled) 2097 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2098 * [tlv] HT information (vendor OUI, if STA enabled) 2099 * [tlv] Atheros capabilities (if STA enabled) 2100 * [tlv] AppIE's (optional) 2101 */ 2102 m = ieee80211_getmgtframe(&frm, 2103 ic->ic_headroom + sizeof(struct ieee80211_frame), 2104 sizeof(uint16_t) 2105 + sizeof(uint16_t) 2106 + sizeof(uint16_t) 2107 + 2 + IEEE80211_RATE_SIZE 2108 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2109 + sizeof(struct ieee80211_ie_htcap) + 4 2110 + sizeof(struct ieee80211_ie_htinfo) + 4 2111 + sizeof(struct ieee80211_wme_param) 2112 #ifdef IEEE80211_SUPPORT_SUPERG 2113 + sizeof(struct ieee80211_ath_ie) 2114 #endif 2115 + (vap->iv_appie_assocresp != NULL ? 2116 vap->iv_appie_assocresp->ie_len : 0) 2117 ); 2118 if (m == NULL) 2119 senderr(ENOMEM, is_tx_nobuf); 2120 2121 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2122 *(uint16_t *)frm = htole16(capinfo); 2123 frm += 2; 2124 2125 *(uint16_t *)frm = htole16(arg); /* status */ 2126 frm += 2; 2127 2128 if (arg == IEEE80211_STATUS_SUCCESS) { 2129 *(uint16_t *)frm = htole16(ni->ni_associd); 2130 IEEE80211_NODE_STAT(ni, tx_assoc); 2131 } else 2132 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2133 frm += 2; 2134 2135 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2136 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2137 /* NB: respond according to what we received */ 2138 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2139 frm = ieee80211_add_htcap(frm, ni); 2140 frm = ieee80211_add_htinfo(frm, ni); 2141 } 2142 if ((vap->iv_flags & IEEE80211_F_WME) && 2143 ni->ni_ies.wme_ie != NULL) 2144 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2145 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2146 frm = ieee80211_add_htcap_vendor(frm, ni); 2147 frm = ieee80211_add_htinfo_vendor(frm, ni); 2148 } 2149 #ifdef IEEE80211_SUPPORT_SUPERG 2150 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2151 frm = ieee80211_add_ath(frm, 2152 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2153 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2154 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2155 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2156 #endif /* IEEE80211_SUPPORT_SUPERG */ 2157 if (vap->iv_appie_assocresp != NULL) 2158 frm = add_appie(frm, vap->iv_appie_assocresp); 2159 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2160 break; 2161 2162 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2163 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2164 "send station disassociate (reason %d)", arg); 2165 m = ieee80211_getmgtframe(&frm, 2166 ic->ic_headroom + sizeof(struct ieee80211_frame), 2167 sizeof(uint16_t)); 2168 if (m == NULL) 2169 senderr(ENOMEM, is_tx_nobuf); 2170 *(uint16_t *)frm = htole16(arg); /* reason */ 2171 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2172 2173 IEEE80211_NODE_STAT(ni, tx_disassoc); 2174 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2175 break; 2176 2177 default: 2178 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2179 "invalid mgmt frame type %u", type); 2180 senderr(EINVAL, is_tx_unknownmgt); 2181 /* NOTREACHED */ 2182 } 2183 2184 /* NB: force non-ProbeResp frames to the highest queue */ 2185 params.ibp_pri = WME_AC_VO; 2186 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2187 /* NB: we know all frames are unicast */ 2188 params.ibp_try0 = bss->ni_txparms->maxretry; 2189 params.ibp_power = bss->ni_txpower; 2190 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2191 bad: 2192 ieee80211_free_node(ni); 2193 return ret; 2194 #undef senderr 2195 #undef HTFLAGS 2196 } 2197 2198 /* 2199 * Return an mbuf with a probe response frame in it. 2200 * Space is left to prepend and 802.11 header at the 2201 * front but it's left to the caller to fill in. 2202 */ 2203 struct mbuf * 2204 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2205 { 2206 struct ieee80211vap *vap = bss->ni_vap; 2207 struct ieee80211com *ic = bss->ni_ic; 2208 const struct ieee80211_rateset *rs; 2209 struct mbuf *m; 2210 uint16_t capinfo; 2211 uint8_t *frm; 2212 2213 /* 2214 * probe response frame format 2215 * [8] time stamp 2216 * [2] beacon interval 2217 * [2] cabability information 2218 * [tlv] ssid 2219 * [tlv] supported rates 2220 * [tlv] parameter set (FH/DS) 2221 * [tlv] parameter set (IBSS) 2222 * [tlv] country (optional) 2223 * [3] power control (optional) 2224 * [5] channel switch announcement (CSA) (optional) 2225 * [tlv] extended rate phy (ERP) 2226 * [tlv] extended supported rates 2227 * [tlv] RSN (optional) 2228 * [tlv] HT capabilities 2229 * [tlv] HT information 2230 * [tlv] WPA (optional) 2231 * [tlv] WME (optional) 2232 * [tlv] Vendor OUI HT capabilities (optional) 2233 * [tlv] Vendor OUI HT information (optional) 2234 * [tlv] Atheros capabilities 2235 * [tlv] AppIE's (optional) 2236 * [tlv] Mesh ID (MBSS) 2237 * [tlv] Mesh Conf (MBSS) 2238 */ 2239 m = ieee80211_getmgtframe(&frm, 2240 ic->ic_headroom + sizeof(struct ieee80211_frame), 2241 8 2242 + sizeof(uint16_t) 2243 + sizeof(uint16_t) 2244 + 2 + IEEE80211_NWID_LEN 2245 + 2 + IEEE80211_RATE_SIZE 2246 + 7 /* max(7,3) */ 2247 + IEEE80211_COUNTRY_MAX_SIZE 2248 + 3 2249 + sizeof(struct ieee80211_csa_ie) 2250 + 3 2251 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2252 + sizeof(struct ieee80211_ie_wpa) 2253 + sizeof(struct ieee80211_ie_htcap) 2254 + sizeof(struct ieee80211_ie_htinfo) 2255 + sizeof(struct ieee80211_ie_wpa) 2256 + sizeof(struct ieee80211_wme_param) 2257 + 4 + sizeof(struct ieee80211_ie_htcap) 2258 + 4 + sizeof(struct ieee80211_ie_htinfo) 2259 #ifdef IEEE80211_SUPPORT_SUPERG 2260 + sizeof(struct ieee80211_ath_ie) 2261 #endif 2262 #ifdef IEEE80211_SUPPORT_MESH 2263 + 2 + IEEE80211_MESHID_LEN 2264 + sizeof(struct ieee80211_meshconf_ie) 2265 #endif 2266 + (vap->iv_appie_proberesp != NULL ? 2267 vap->iv_appie_proberesp->ie_len : 0) 2268 ); 2269 if (m == NULL) { 2270 vap->iv_stats.is_tx_nobuf++; 2271 return NULL; 2272 } 2273 2274 memset(frm, 0, 8); /* timestamp should be filled later */ 2275 frm += 8; 2276 *(uint16_t *)frm = htole16(bss->ni_intval); 2277 frm += 2; 2278 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2279 *(uint16_t *)frm = htole16(capinfo); 2280 frm += 2; 2281 2282 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2283 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2284 frm = ieee80211_add_rates(frm, rs); 2285 2286 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2287 *frm++ = IEEE80211_ELEMID_FHPARMS; 2288 *frm++ = 5; 2289 *frm++ = bss->ni_fhdwell & 0x00ff; 2290 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2291 *frm++ = IEEE80211_FH_CHANSET( 2292 ieee80211_chan2ieee(ic, bss->ni_chan)); 2293 *frm++ = IEEE80211_FH_CHANPAT( 2294 ieee80211_chan2ieee(ic, bss->ni_chan)); 2295 *frm++ = bss->ni_fhindex; 2296 } else { 2297 *frm++ = IEEE80211_ELEMID_DSPARMS; 2298 *frm++ = 1; 2299 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2300 } 2301 2302 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2303 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2304 *frm++ = 2; 2305 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2306 } 2307 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2308 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2309 frm = ieee80211_add_countryie(frm, ic); 2310 if (vap->iv_flags & IEEE80211_F_DOTH) { 2311 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2312 frm = ieee80211_add_powerconstraint(frm, vap); 2313 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2314 frm = ieee80211_add_csa(frm, vap); 2315 } 2316 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2317 frm = ieee80211_add_erp(frm, ic); 2318 frm = ieee80211_add_xrates(frm, rs); 2319 if (vap->iv_flags & IEEE80211_F_WPA2) { 2320 if (vap->iv_rsn_ie != NULL) 2321 frm = add_ie(frm, vap->iv_rsn_ie); 2322 /* XXX else complain? */ 2323 } 2324 /* 2325 * NB: legacy 11b clients do not get certain ie's. 2326 * The caller identifies such clients by passing 2327 * a token in legacy to us. Could expand this to be 2328 * any legacy client for stuff like HT ie's. 2329 */ 2330 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2331 legacy != IEEE80211_SEND_LEGACY_11B) { 2332 frm = ieee80211_add_htcap(frm, bss); 2333 frm = ieee80211_add_htinfo(frm, bss); 2334 } 2335 if (vap->iv_flags & IEEE80211_F_WPA1) { 2336 if (vap->iv_wpa_ie != NULL) 2337 frm = add_ie(frm, vap->iv_wpa_ie); 2338 /* XXX else complain? */ 2339 } 2340 if (vap->iv_flags & IEEE80211_F_WME) 2341 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2342 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2343 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2344 legacy != IEEE80211_SEND_LEGACY_11B) { 2345 frm = ieee80211_add_htcap_vendor(frm, bss); 2346 frm = ieee80211_add_htinfo_vendor(frm, bss); 2347 } 2348 #ifdef IEEE80211_SUPPORT_SUPERG 2349 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2350 legacy != IEEE80211_SEND_LEGACY_11B) 2351 frm = ieee80211_add_athcaps(frm, bss); 2352 #endif 2353 if (vap->iv_appie_proberesp != NULL) 2354 frm = add_appie(frm, vap->iv_appie_proberesp); 2355 #ifdef IEEE80211_SUPPORT_MESH 2356 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2357 frm = ieee80211_add_meshid(frm, vap); 2358 frm = ieee80211_add_meshconf(frm, vap); 2359 } 2360 #endif 2361 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2362 2363 return m; 2364 } 2365 2366 /* 2367 * Send a probe response frame to the specified mac address. 2368 * This does not go through the normal mgt frame api so we 2369 * can specify the destination address and re-use the bss node 2370 * for the sta reference. 2371 */ 2372 int 2373 ieee80211_send_proberesp(struct ieee80211vap *vap, 2374 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2375 { 2376 struct ieee80211_node *bss = vap->iv_bss; 2377 struct ieee80211com *ic = vap->iv_ic; 2378 struct ieee80211_frame *wh; 2379 struct mbuf *m; 2380 2381 if (vap->iv_state == IEEE80211_S_CAC) { 2382 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2383 "block %s frame in CAC state", "probe response"); 2384 vap->iv_stats.is_tx_badstate++; 2385 return EIO; /* XXX */ 2386 } 2387 2388 /* 2389 * Hold a reference on the node so it doesn't go away until after 2390 * the xmit is complete all the way in the driver. On error we 2391 * will remove our reference. 2392 */ 2393 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2394 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n", 2395 __func__, __LINE__, bss, bss->ni_macaddr, ":", 2396 ieee80211_node_refcnt(bss)+1); 2397 ieee80211_ref_node(bss); 2398 2399 m = ieee80211_alloc_proberesp(bss, legacy); 2400 if (m == NULL) { 2401 ieee80211_free_node(bss); 2402 return ENOMEM; 2403 } 2404 2405 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2406 KASSERT(m != NULL, ("no room for header")); 2407 2408 wh = mtod(m, struct ieee80211_frame *); 2409 ieee80211_send_setup(bss, m, 2410 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2411 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2412 /* XXX power management? */ 2413 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2414 2415 M_WME_SETAC(m, WME_AC_BE); 2416 2417 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2418 "send probe resp on channel %u to %6D%s\n", 2419 ieee80211_chan2ieee(ic, ic->ic_curchan), da, ":", 2420 legacy ? " <legacy>" : ""); 2421 IEEE80211_NODE_STAT(bss, tx_mgmt); 2422 2423 return ic->ic_raw_xmit(bss, m, NULL); 2424 } 2425 2426 /* 2427 * Allocate and build a RTS (Request To Send) control frame. 2428 */ 2429 struct mbuf * 2430 ieee80211_alloc_rts(struct ieee80211com *ic, 2431 const uint8_t ra[IEEE80211_ADDR_LEN], 2432 const uint8_t ta[IEEE80211_ADDR_LEN], 2433 uint16_t dur) 2434 { 2435 struct ieee80211_frame_rts *rts; 2436 struct mbuf *m; 2437 2438 /* XXX honor ic_headroom */ 2439 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2440 if (m != NULL) { 2441 rts = mtod(m, struct ieee80211_frame_rts *); 2442 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2443 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2444 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2445 *(u_int16_t *)rts->i_dur = htole16(dur); 2446 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2447 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2448 2449 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2450 } 2451 return m; 2452 } 2453 2454 /* 2455 * Allocate and build a CTS (Clear To Send) control frame. 2456 */ 2457 struct mbuf * 2458 ieee80211_alloc_cts(struct ieee80211com *ic, 2459 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2460 { 2461 struct ieee80211_frame_cts *cts; 2462 struct mbuf *m; 2463 2464 /* XXX honor ic_headroom */ 2465 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2466 if (m != NULL) { 2467 cts = mtod(m, struct ieee80211_frame_cts *); 2468 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2469 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2470 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2471 *(u_int16_t *)cts->i_dur = htole16(dur); 2472 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2473 2474 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2475 } 2476 return m; 2477 } 2478 2479 static void 2480 ieee80211_tx_mgt_timeout_callout(void *arg) 2481 { 2482 struct ieee80211_node *ni = arg; 2483 struct ieee80211vap *vap; 2484 2485 wlan_serialize_enter(); 2486 vap = ni->ni_vap; 2487 if (vap->iv_state != IEEE80211_S_INIT && 2488 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2489 /* 2490 * NB: it's safe to specify a timeout as the reason here; 2491 * it'll only be used in the right state. 2492 */ 2493 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2494 IEEE80211_SCAN_FAIL_TIMEOUT); 2495 } 2496 wlan_serialize_exit(); 2497 } 2498 2499 static void 2500 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2501 { 2502 struct ieee80211vap *vap = ni->ni_vap; 2503 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2504 2505 /* 2506 * Frame transmit completed; arrange timer callback. If 2507 * transmit was successfuly we wait for response. Otherwise 2508 * we arrange an immediate callback instead of doing the 2509 * callback directly since we don't know what state the driver 2510 * is in (e.g. what locks it is holding). This work should 2511 * not be too time-critical and not happen too often so the 2512 * added overhead is acceptable. 2513 * 2514 * XXX what happens if !acked but response shows up before callback? 2515 */ 2516 if (vap->iv_state == ostate) 2517 callout_reset(&vap->iv_mgtsend, 2518 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2519 ieee80211_tx_mgt_timeout_callout, ni); 2520 } 2521 2522 static void 2523 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2524 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2525 { 2526 struct ieee80211vap *vap = ni->ni_vap; 2527 struct ieee80211com *ic = ni->ni_ic; 2528 struct ieee80211_rateset *rs = &ni->ni_rates; 2529 uint16_t capinfo; 2530 2531 /* 2532 * beacon frame format 2533 * [8] time stamp 2534 * [2] beacon interval 2535 * [2] cabability information 2536 * [tlv] ssid 2537 * [tlv] supported rates 2538 * [3] parameter set (DS) 2539 * [8] CF parameter set (optional) 2540 * [tlv] parameter set (IBSS/TIM) 2541 * [tlv] country (optional) 2542 * [3] power control (optional) 2543 * [5] channel switch announcement (CSA) (optional) 2544 * [tlv] extended rate phy (ERP) 2545 * [tlv] extended supported rates 2546 * [tlv] RSN parameters 2547 * [tlv] HT capabilities 2548 * [tlv] HT information 2549 * XXX Vendor-specific OIDs (e.g. Atheros) 2550 * [tlv] WPA parameters 2551 * [tlv] WME parameters 2552 * [tlv] Vendor OUI HT capabilities (optional) 2553 * [tlv] Vendor OUI HT information (optional) 2554 * [tlv] Atheros capabilities (optional) 2555 * [tlv] TDMA parameters (optional) 2556 * [tlv] Mesh ID (MBSS) 2557 * [tlv] Mesh Conf (MBSS) 2558 * [tlv] application data (optional) 2559 */ 2560 2561 memset(bo, 0, sizeof(*bo)); 2562 2563 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2564 frm += 8; 2565 *(uint16_t *)frm = htole16(ni->ni_intval); 2566 frm += 2; 2567 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2568 bo->bo_caps = (uint16_t *)frm; 2569 *(uint16_t *)frm = htole16(capinfo); 2570 frm += 2; 2571 *frm++ = IEEE80211_ELEMID_SSID; 2572 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2573 *frm++ = ni->ni_esslen; 2574 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2575 frm += ni->ni_esslen; 2576 } else 2577 *frm++ = 0; 2578 frm = ieee80211_add_rates(frm, rs); 2579 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2580 *frm++ = IEEE80211_ELEMID_DSPARMS; 2581 *frm++ = 1; 2582 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2583 } 2584 if (ic->ic_flags & IEEE80211_F_PCF) { 2585 bo->bo_cfp = frm; 2586 frm = ieee80211_add_cfparms(frm, ic); 2587 } 2588 bo->bo_tim = frm; 2589 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2590 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2591 *frm++ = 2; 2592 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2593 bo->bo_tim_len = 0; 2594 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2595 vap->iv_opmode == IEEE80211_M_MBSS) { 2596 /* TIM IE is the same for Mesh and Hostap */ 2597 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2598 2599 tie->tim_ie = IEEE80211_ELEMID_TIM; 2600 tie->tim_len = 4; /* length */ 2601 tie->tim_count = 0; /* DTIM count */ 2602 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2603 tie->tim_bitctl = 0; /* bitmap control */ 2604 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2605 frm += sizeof(struct ieee80211_tim_ie); 2606 bo->bo_tim_len = 1; 2607 } 2608 bo->bo_tim_trailer = frm; 2609 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2610 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2611 frm = ieee80211_add_countryie(frm, ic); 2612 if (vap->iv_flags & IEEE80211_F_DOTH) { 2613 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2614 frm = ieee80211_add_powerconstraint(frm, vap); 2615 bo->bo_csa = frm; 2616 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2617 frm = ieee80211_add_csa(frm, vap); 2618 } else 2619 bo->bo_csa = frm; 2620 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2621 bo->bo_erp = frm; 2622 frm = ieee80211_add_erp(frm, ic); 2623 } 2624 frm = ieee80211_add_xrates(frm, rs); 2625 if (vap->iv_flags & IEEE80211_F_WPA2) { 2626 if (vap->iv_rsn_ie != NULL) 2627 frm = add_ie(frm, vap->iv_rsn_ie); 2628 /* XXX else complain */ 2629 } 2630 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2631 frm = ieee80211_add_htcap(frm, ni); 2632 bo->bo_htinfo = frm; 2633 frm = ieee80211_add_htinfo(frm, ni); 2634 } 2635 if (vap->iv_flags & IEEE80211_F_WPA1) { 2636 if (vap->iv_wpa_ie != NULL) 2637 frm = add_ie(frm, vap->iv_wpa_ie); 2638 /* XXX else complain */ 2639 } 2640 if (vap->iv_flags & IEEE80211_F_WME) { 2641 bo->bo_wme = frm; 2642 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2643 } 2644 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2645 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2646 frm = ieee80211_add_htcap_vendor(frm, ni); 2647 frm = ieee80211_add_htinfo_vendor(frm, ni); 2648 } 2649 #ifdef IEEE80211_SUPPORT_SUPERG 2650 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2651 bo->bo_ath = frm; 2652 frm = ieee80211_add_athcaps(frm, ni); 2653 } 2654 #endif 2655 #ifdef IEEE80211_SUPPORT_TDMA 2656 if (vap->iv_caps & IEEE80211_C_TDMA) { 2657 bo->bo_tdma = frm; 2658 frm = ieee80211_add_tdma(frm, vap); 2659 } 2660 #endif 2661 if (vap->iv_appie_beacon != NULL) { 2662 bo->bo_appie = frm; 2663 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2664 frm = add_appie(frm, vap->iv_appie_beacon); 2665 } 2666 #ifdef IEEE80211_SUPPORT_MESH 2667 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2668 frm = ieee80211_add_meshid(frm, vap); 2669 bo->bo_meshconf = frm; 2670 frm = ieee80211_add_meshconf(frm, vap); 2671 } 2672 #endif 2673 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2674 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2675 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2676 } 2677 2678 /* 2679 * Allocate a beacon frame and fillin the appropriate bits. 2680 */ 2681 struct mbuf * 2682 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2683 struct ieee80211_beacon_offsets *bo) 2684 { 2685 struct ieee80211vap *vap = ni->ni_vap; 2686 struct ieee80211com *ic = ni->ni_ic; 2687 struct ifnet *ifp = vap->iv_ifp; 2688 struct ieee80211_frame *wh; 2689 struct mbuf *m; 2690 int pktlen; 2691 uint8_t *frm; 2692 2693 /* 2694 * beacon frame format 2695 * [8] time stamp 2696 * [2] beacon interval 2697 * [2] cabability information 2698 * [tlv] ssid 2699 * [tlv] supported rates 2700 * [3] parameter set (DS) 2701 * [8] CF parameter set (optional) 2702 * [tlv] parameter set (IBSS/TIM) 2703 * [tlv] country (optional) 2704 * [3] power control (optional) 2705 * [5] channel switch announcement (CSA) (optional) 2706 * [tlv] extended rate phy (ERP) 2707 * [tlv] extended supported rates 2708 * [tlv] RSN parameters 2709 * [tlv] HT capabilities 2710 * [tlv] HT information 2711 * [tlv] Vendor OUI HT capabilities (optional) 2712 * [tlv] Vendor OUI HT information (optional) 2713 * XXX Vendor-specific OIDs (e.g. Atheros) 2714 * [tlv] WPA parameters 2715 * [tlv] WME parameters 2716 * [tlv] TDMA parameters (optional) 2717 * [tlv] Mesh ID (MBSS) 2718 * [tlv] Mesh Conf (MBSS) 2719 * [tlv] application data (optional) 2720 * NB: we allocate the max space required for the TIM bitmap. 2721 * XXX how big is this? 2722 */ 2723 pktlen = 8 /* time stamp */ 2724 + sizeof(uint16_t) /* beacon interval */ 2725 + sizeof(uint16_t) /* capabilities */ 2726 + 2 + ni->ni_esslen /* ssid */ 2727 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2728 + 2 + 1 /* DS parameters */ 2729 + 2 + 6 /* CF parameters */ 2730 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2731 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2732 + 2 + 1 /* power control */ 2733 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2734 + 2 + 1 /* ERP */ 2735 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2736 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2737 2*sizeof(struct ieee80211_ie_wpa) : 0) 2738 /* XXX conditional? */ 2739 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2740 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2741 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2742 sizeof(struct ieee80211_wme_param) : 0) 2743 #ifdef IEEE80211_SUPPORT_SUPERG 2744 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2745 #endif 2746 #ifdef IEEE80211_SUPPORT_TDMA 2747 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2748 sizeof(struct ieee80211_tdma_param) : 0) 2749 #endif 2750 #ifdef IEEE80211_SUPPORT_MESH 2751 + 2 + ni->ni_meshidlen 2752 + sizeof(struct ieee80211_meshconf_ie) 2753 #endif 2754 + IEEE80211_MAX_APPIE 2755 ; 2756 m = ieee80211_getmgtframe(&frm, 2757 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2758 if (m == NULL) { 2759 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2760 "%s: cannot get buf; size %u\n", __func__, pktlen); 2761 vap->iv_stats.is_tx_nobuf++; 2762 return NULL; 2763 } 2764 ieee80211_beacon_construct(m, frm, bo, ni); 2765 2766 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2767 KASSERT(m != NULL, ("no space for 802.11 header?")); 2768 wh = mtod(m, struct ieee80211_frame *); 2769 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2770 IEEE80211_FC0_SUBTYPE_BEACON; 2771 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2772 *(uint16_t *)wh->i_dur = 0; 2773 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2774 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2775 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2776 *(uint16_t *)wh->i_seq = 0; 2777 2778 return m; 2779 } 2780 2781 /* 2782 * Update the dynamic parts of a beacon frame based on the current state. 2783 */ 2784 int 2785 ieee80211_beacon_update(struct ieee80211_node *ni, 2786 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2787 { 2788 struct ieee80211vap *vap = ni->ni_vap; 2789 struct ieee80211com *ic = ni->ni_ic; 2790 int len_changed = 0; 2791 uint16_t capinfo; 2792 2793 /* 2794 * Handle 11h channel change when we've reached the count. 2795 * We must recalculate the beacon frame contents to account 2796 * for the new channel. Note we do this only for the first 2797 * vap that reaches this point; subsequent vaps just update 2798 * their beacon state to reflect the recalculated channel. 2799 */ 2800 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2801 vap->iv_csa_count == ic->ic_csa_count) { 2802 vap->iv_csa_count = 0; 2803 /* 2804 * Effect channel change before reconstructing the beacon 2805 * frame contents as many places reference ni_chan. 2806 */ 2807 if (ic->ic_csa_newchan != NULL) 2808 ieee80211_csa_completeswitch(ic); 2809 /* 2810 * NB: ieee80211_beacon_construct clears all pending 2811 * updates in bo_flags so we don't need to explicitly 2812 * clear IEEE80211_BEACON_CSA. 2813 */ 2814 ieee80211_beacon_construct(m, 2815 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2816 2817 /* XXX do WME aggressive mode processing? */ 2818 return 1; /* just assume length changed */ 2819 } 2820 2821 /* XXX faster to recalculate entirely or just changes? */ 2822 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2823 *bo->bo_caps = htole16(capinfo); 2824 2825 if (vap->iv_flags & IEEE80211_F_WME) { 2826 struct ieee80211_wme_state *wme = &ic->ic_wme; 2827 2828 /* 2829 * Check for agressive mode change. When there is 2830 * significant high priority traffic in the BSS 2831 * throttle back BE traffic by using conservative 2832 * parameters. Otherwise BE uses agressive params 2833 * to optimize performance of legacy/non-QoS traffic. 2834 */ 2835 if (wme->wme_flags & WME_F_AGGRMODE) { 2836 if (wme->wme_hipri_traffic > 2837 wme->wme_hipri_switch_thresh) { 2838 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2839 "%s: traffic %u, disable aggressive mode\n", 2840 __func__, wme->wme_hipri_traffic); 2841 wme->wme_flags &= ~WME_F_AGGRMODE; 2842 ieee80211_wme_updateparams_locked(vap); 2843 wme->wme_hipri_traffic = 2844 wme->wme_hipri_switch_hysteresis; 2845 } else 2846 wme->wme_hipri_traffic = 0; 2847 } else { 2848 if (wme->wme_hipri_traffic <= 2849 wme->wme_hipri_switch_thresh) { 2850 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2851 "%s: traffic %u, enable aggressive mode\n", 2852 __func__, wme->wme_hipri_traffic); 2853 wme->wme_flags |= WME_F_AGGRMODE; 2854 ieee80211_wme_updateparams_locked(vap); 2855 wme->wme_hipri_traffic = 0; 2856 } else 2857 wme->wme_hipri_traffic = 2858 wme->wme_hipri_switch_hysteresis; 2859 } 2860 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2861 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2862 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2863 } 2864 } 2865 2866 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2867 ieee80211_ht_update_beacon(vap, bo); 2868 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2869 } 2870 #ifdef IEEE80211_SUPPORT_TDMA 2871 if (vap->iv_caps & IEEE80211_C_TDMA) { 2872 /* 2873 * NB: the beacon is potentially updated every TBTT. 2874 */ 2875 ieee80211_tdma_update_beacon(vap, bo); 2876 } 2877 #endif 2878 #ifdef IEEE80211_SUPPORT_MESH 2879 if (vap->iv_opmode == IEEE80211_M_MBSS) 2880 ieee80211_mesh_update_beacon(vap, bo); 2881 #endif 2882 2883 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2884 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2885 struct ieee80211_tim_ie *tie = 2886 (struct ieee80211_tim_ie *) bo->bo_tim; 2887 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2888 u_int timlen, timoff, i; 2889 /* 2890 * ATIM/DTIM needs updating. If it fits in the 2891 * current space allocated then just copy in the 2892 * new bits. Otherwise we need to move any trailing 2893 * data to make room. Note that we know there is 2894 * contiguous space because ieee80211_beacon_allocate 2895 * insures there is space in the mbuf to write a 2896 * maximal-size virtual bitmap (based on iv_max_aid). 2897 */ 2898 /* 2899 * Calculate the bitmap size and offset, copy any 2900 * trailer out of the way, and then copy in the 2901 * new bitmap and update the information element. 2902 * Note that the tim bitmap must contain at least 2903 * one byte and any offset must be even. 2904 */ 2905 if (vap->iv_ps_pending != 0) { 2906 timoff = 128; /* impossibly large */ 2907 for (i = 0; i < vap->iv_tim_len; i++) 2908 if (vap->iv_tim_bitmap[i]) { 2909 timoff = i &~ 1; 2910 break; 2911 } 2912 KASSERT(timoff != 128, ("tim bitmap empty!")); 2913 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2914 if (vap->iv_tim_bitmap[i]) 2915 break; 2916 timlen = 1 + (i - timoff); 2917 } else { 2918 timoff = 0; 2919 timlen = 1; 2920 } 2921 if (timlen != bo->bo_tim_len) { 2922 /* copy up/down trailer */ 2923 int adjust = tie->tim_bitmap+timlen 2924 - bo->bo_tim_trailer; 2925 ovbcopy(bo->bo_tim_trailer, 2926 bo->bo_tim_trailer+adjust, 2927 bo->bo_tim_trailer_len); 2928 bo->bo_tim_trailer += adjust; 2929 bo->bo_erp += adjust; 2930 bo->bo_htinfo += adjust; 2931 #ifdef IEEE80211_SUPERG_SUPPORT 2932 bo->bo_ath += adjust; 2933 #endif 2934 #ifdef IEEE80211_TDMA_SUPPORT 2935 bo->bo_tdma += adjust; 2936 #endif 2937 #ifdef IEEE80211_MESH_SUPPORT 2938 bo->bo_meshconf += adjust; 2939 #endif 2940 bo->bo_appie += adjust; 2941 bo->bo_wme += adjust; 2942 bo->bo_csa += adjust; 2943 bo->bo_tim_len = timlen; 2944 2945 /* update information element */ 2946 tie->tim_len = 3 + timlen; 2947 tie->tim_bitctl = timoff; 2948 len_changed = 1; 2949 } 2950 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2951 bo->bo_tim_len); 2952 2953 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2954 2955 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2956 "%s: TIM updated, pending %u, off %u, len %u\n", 2957 __func__, vap->iv_ps_pending, timoff, timlen); 2958 } 2959 /* count down DTIM period */ 2960 if (tie->tim_count == 0) 2961 tie->tim_count = tie->tim_period - 1; 2962 else 2963 tie->tim_count--; 2964 /* update state for buffered multicast frames on DTIM */ 2965 if (mcast && tie->tim_count == 0) 2966 tie->tim_bitctl |= 1; 2967 else 2968 tie->tim_bitctl &= ~1; 2969 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2970 struct ieee80211_csa_ie *csa = 2971 (struct ieee80211_csa_ie *) bo->bo_csa; 2972 2973 /* 2974 * Insert or update CSA ie. If we're just starting 2975 * to count down to the channel switch then we need 2976 * to insert the CSA ie. Otherwise we just need to 2977 * drop the count. The actual change happens above 2978 * when the vap's count reaches the target count. 2979 */ 2980 if (vap->iv_csa_count == 0) { 2981 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 2982 bo->bo_erp += sizeof(*csa); 2983 bo->bo_htinfo += sizeof(*csa); 2984 bo->bo_wme += sizeof(*csa); 2985 #ifdef IEEE80211_SUPERG_SUPPORT 2986 bo->bo_ath += sizeof(*csa); 2987 #endif 2988 #ifdef IEEE80211_TDMA_SUPPORT 2989 bo->bo_tdma += sizeof(*csa); 2990 #endif 2991 #ifdef IEEE80211_MESH_SUPPORT 2992 bo->bo_meshconf += sizeof(*csa); 2993 #endif 2994 bo->bo_appie += sizeof(*csa); 2995 bo->bo_csa_trailer_len += sizeof(*csa); 2996 bo->bo_tim_trailer_len += sizeof(*csa); 2997 m->m_len += sizeof(*csa); 2998 m->m_pkthdr.len += sizeof(*csa); 2999 3000 ieee80211_add_csa(bo->bo_csa, vap); 3001 } else 3002 csa->csa_count--; 3003 vap->iv_csa_count++; 3004 /* NB: don't clear IEEE80211_BEACON_CSA */ 3005 } 3006 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3007 /* 3008 * ERP element needs updating. 3009 */ 3010 (void) ieee80211_add_erp(bo->bo_erp, ic); 3011 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3012 } 3013 #ifdef IEEE80211_SUPPORT_SUPERG 3014 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3015 ieee80211_add_athcaps(bo->bo_ath, ni); 3016 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3017 } 3018 #endif 3019 } 3020 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3021 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3022 int aielen; 3023 uint8_t *frm; 3024 3025 aielen = 0; 3026 if (aie != NULL) 3027 aielen += aie->ie_len; 3028 if (aielen != bo->bo_appie_len) { 3029 /* copy up/down trailer */ 3030 int adjust = aielen - bo->bo_appie_len; 3031 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3032 bo->bo_tim_trailer_len); 3033 bo->bo_tim_trailer += adjust; 3034 bo->bo_appie += adjust; 3035 bo->bo_appie_len = aielen; 3036 3037 len_changed = 1; 3038 } 3039 frm = bo->bo_appie; 3040 if (aie != NULL) 3041 frm = add_appie(frm, aie); 3042 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3043 } 3044 3045 return len_changed; 3046 } 3047