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 */ 28 29 #include "opt_inet.h" 30 #include "opt_inet6.h" 31 #include "opt_wlan.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/mbuf.h> 36 #include <sys/kernel.h> 37 #include <sys/endian.h> 38 39 #include <sys/socket.h> 40 41 #include <net/bpf.h> 42 #include <net/ethernet.h> 43 #include <net/route.h> 44 #include <net/if.h> 45 #include <net/if_llc.h> 46 #include <net/if_media.h> 47 #include <net/ifq_var.h> 48 49 #include <netproto/802_11/ieee80211_var.h> 50 #include <netproto/802_11/ieee80211_regdomain.h> 51 #ifdef IEEE80211_SUPPORT_SUPERG 52 #include <netproto/802_11/ieee80211_superg.h> 53 #endif 54 #ifdef IEEE80211_SUPPORT_TDMA 55 #include <netproto/802_11/ieee80211_tdma.h> 56 #endif 57 #include <netproto/802_11/ieee80211_wds.h> 58 #include <netproto/802_11/ieee80211_mesh.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/if_ether.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #endif 66 #ifdef INET6 67 #include <netinet/ip6.h> 68 #endif 69 70 #define ETHER_HEADER_COPY(dst, src) \ 71 memcpy(dst, src, sizeof(struct ether_header)) 72 73 /* unalligned little endian access */ 74 #define LE_WRITE_2(p, v) do { \ 75 ((uint8_t *)(p))[0] = (v) & 0xff; \ 76 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 77 } while (0) 78 #define LE_WRITE_4(p, v) do { \ 79 ((uint8_t *)(p))[0] = (v) & 0xff; \ 80 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ 81 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ 82 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ 83 } while (0) 84 85 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *, 86 u_int hdrsize, u_int ciphdrsize, u_int mtu); 87 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 88 89 #ifdef IEEE80211_DEBUG 90 /* 91 * Decide if an outbound management frame should be 92 * printed when debugging is enabled. This filters some 93 * of the less interesting frames that come frequently 94 * (e.g. beacons). 95 */ 96 static __inline int 97 doprint(struct ieee80211vap *vap, int subtype) 98 { 99 switch (subtype) { 100 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 101 return (vap->iv_opmode == IEEE80211_M_IBSS); 102 } 103 return 1; 104 } 105 #endif 106 107 /* 108 * Start method for vap's. All packets from the stack come 109 * through here. We handle common processing of the packets 110 * before dispatching them to the underlying device. 111 */ 112 void 113 ieee80211_start(struct ifnet *ifp, struct ifaltq_subque *ifsq) 114 { 115 #define IS_DWDS(vap) \ 116 (vap->iv_opmode == IEEE80211_M_WDS && \ 117 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) 118 struct ieee80211vap *vap = ifp->if_softc; 119 struct ieee80211com *ic = vap->iv_ic; 120 struct ifnet *parent = ic->ic_ifp; 121 struct ieee80211_node *ni; 122 struct mbuf *m = NULL; 123 struct ether_header *eh; 124 int error; 125 126 wlan_assert_serialized(); 127 ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq); 128 129 /* NB: parent must be up and running */ 130 if (!IFNET_IS_UP_RUNNING(parent)) { 131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 132 "%s: ignore queue, parent %s not up+running\n", 133 __func__, parent->if_xname); 134 /* XXX stat */ 135 ifsq_purge(ifsq); 136 return; 137 } 138 /* 139 * No data frames go out unless we're running. 140 * Note in particular this covers CAC and CSA 141 * states (though maybe we should check muting 142 * for CSA). 143 */ 144 if (vap->iv_state != IEEE80211_S_RUN && 145 vap->iv_state != IEEE80211_S_SLEEP) { 146 /* re-check under the com lock to avoid races */ 147 if (vap->iv_state != IEEE80211_S_RUN && 148 vap->iv_state != IEEE80211_S_SLEEP) { 149 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 150 "%s: ignore queue, in %s state\n", 151 __func__, ieee80211_state_name[vap->iv_state]); 152 vap->iv_stats.is_tx_badstate++; 153 ifsq_set_oactive(ifsq); 154 return; 155 } 156 } 157 for (;;) { 158 m = ifsq_dequeue(ifsq); 159 if (m == NULL) 160 break; 161 /* 162 * Sanitize mbuf flags for net80211 use. We cannot 163 * clear M_PWR_SAV or M_MORE_DATA because these may 164 * be set for frames that are re-submitted from the 165 * power save queue. 166 * 167 * NB: This must be done before ieee80211_classify as 168 * it marks EAPOL in frames with M_EAPOL. 169 */ 170 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA); 171 /* 172 * Cancel any background scan. 173 */ 174 if (ic->ic_flags & IEEE80211_F_SCAN) 175 ieee80211_cancel_anyscan(vap); 176 /* 177 * Find the node for the destination so we can do 178 * things like power save and fast frames aggregation. 179 * 180 * NB: past this point various code assumes the first 181 * mbuf has the 802.3 header present (and contiguous). 182 */ 183 ni = NULL; 184 if (m->m_len < sizeof(struct ether_header) && 185 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) { 186 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 187 "discard frame, %s\n", "m_pullup failed"); 188 vap->iv_stats.is_tx_nobuf++; /* XXX */ 189 IFNET_STAT_INC(ifp, oerrors, 1); 190 continue; 191 } 192 eh = mtod(m, struct ether_header *); 193 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 194 if (IS_DWDS(vap)) { 195 /* 196 * Only unicast frames from the above go out 197 * DWDS vaps; multicast frames are handled by 198 * dispatching the frame as it comes through 199 * the AP vap (see below). 200 */ 201 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS, 202 eh->ether_dhost, "mcast", "%s", "on DWDS"); 203 vap->iv_stats.is_dwds_mcast++; 204 m_freem(m); 205 continue; 206 } 207 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { 208 /* 209 * Spam DWDS vap's w/ multicast traffic. 210 */ 211 /* XXX only if dwds in use? */ 212 ieee80211_dwds_mcast(vap, m); 213 } 214 } 215 #ifdef IEEE80211_SUPPORT_MESH 216 if (vap->iv_opmode != IEEE80211_M_MBSS) { 217 #endif 218 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 219 if (ni == NULL) { 220 /* NB: ieee80211_find_txnode does stat+msg */ 221 IFNET_STAT_INC(ifp, oerrors, 1); 222 m_freem(m); 223 continue; 224 } 225 if (ni->ni_associd == 0 && 226 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) { 227 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 228 eh->ether_dhost, NULL, 229 "sta not associated (type 0x%04x)", 230 htons(eh->ether_type)); 231 vap->iv_stats.is_tx_notassoc++; 232 IFNET_STAT_INC(ifp, oerrors, 1); 233 m_freem(m); 234 ieee80211_free_node(ni); 235 continue; 236 } 237 #ifdef IEEE80211_SUPPORT_MESH 238 } else { 239 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) { 240 /* 241 * Proxy station only if configured. 242 */ 243 if (!ieee80211_mesh_isproxyena(vap)) { 244 IEEE80211_DISCARD_MAC(vap, 245 IEEE80211_MSG_OUTPUT | 246 IEEE80211_MSG_MESH, 247 eh->ether_dhost, NULL, 248 "%s", "proxy not enabled"); 249 vap->iv_stats.is_mesh_notproxy++; 250 IFNET_STAT_INC(ifp, oerrors, 1); 251 m_freem(m); 252 continue; 253 } 254 ieee80211_mesh_proxy_check(vap, eh->ether_shost); 255 } 256 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m); 257 if (ni == NULL) { 258 /* 259 * NB: ieee80211_mesh_discover holds/disposes 260 * frame (e.g. queueing on path discovery). 261 */ 262 IFNET_STAT_INC(ifp, oerrors, 1); 263 continue; 264 } 265 } 266 #endif 267 /* 268 * We've resolved the sender, so attempt to transmit it. 269 */ 270 if (vap->iv_state == IEEE80211_S_SLEEP) { 271 /* 272 * In power save; queue frame and then wakeup device 273 * for transmit. 274 */ 275 ic->ic_lastdata = ticks; 276 (void) ieee80211_pwrsave(ni, m); 277 ieee80211_free_node(ni); 278 ieee80211_new_state(vap, IEEE80211_S_RUN, 0); 279 continue; 280 } 281 282 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 283 (m->m_flags & M_PWR_SAV) == 0) { 284 /* 285 * Station in power save mode; pass the frame 286 * to the 802.11 layer and continue. We'll get 287 * the frame back when the time is right. 288 * XXX lose WDS vap linkage? 289 */ 290 (void) ieee80211_pwrsave(ni, m); 291 ieee80211_free_node(ni); 292 continue; 293 } 294 /* calculate priority so drivers can find the tx queue */ 295 if (ieee80211_classify(ni, m)) { 296 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT, 297 eh->ether_dhost, NULL, 298 "%s", "classification failure"); 299 vap->iv_stats.is_tx_classify++; 300 IFNET_STAT_INC(ifp, oerrors, 1); 301 m_freem(m); 302 ieee80211_free_node(ni); 303 continue; 304 } 305 /* 306 * Stash the node pointer. Note that we do this after 307 * any call to ieee80211_dwds_mcast because that code 308 * uses any existing value for rcvif to identify the 309 * interface it (might have been) received on. 310 */ 311 m->m_pkthdr.rcvif = (void *)ni; 312 313 BPF_MTAP(ifp, m); /* 802.3 tx */ 314 315 /* 316 * Check if A-MPDU tx aggregation is setup or if we 317 * should try to enable it. The sta must be associated 318 * with HT and A-MPDU enabled for use. When the policy 319 * routine decides we should enable A-MPDU we issue an 320 * ADDBA request and wait for a reply. The frame being 321 * encapsulated will go out w/o using A-MPDU, or possibly 322 * it might be collected by the driver and held/retransmit. 323 * The default ic_ampdu_enable routine handles staggering 324 * ADDBA requests in case the receiver NAK's us or we are 325 * otherwise unable to establish a BA stream. 326 */ 327 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 328 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) && 329 (m->m_flags & M_EAPOL) == 0) { 330 const int ac = M_WME_GETAC(m); 331 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 332 333 ieee80211_txampdu_count_packet(tap); 334 if (IEEE80211_AMPDU_RUNNING(tap)) { 335 /* 336 * Operational, mark frame for aggregation. 337 * 338 * XXX do tx aggregation here 339 */ 340 m->m_flags |= M_AMPDU_MPDU; 341 } else if (!IEEE80211_AMPDU_REQUESTED(tap) && 342 ic->ic_ampdu_enable(ni, tap)) { 343 /* 344 * Not negotiated yet, request service. 345 */ 346 ieee80211_ampdu_request(ni, tap); 347 /* XXX hold frame for reply? */ 348 } 349 } 350 #ifdef IEEE80211_SUPPORT_SUPERG 351 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) { 352 m = ieee80211_ff_check(ni, m); 353 if (m == NULL) { 354 /* NB: any ni ref held on stageq */ 355 continue; 356 } 357 } 358 #endif /* IEEE80211_SUPPORT_SUPERG */ 359 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) { 360 /* 361 * Encapsulate the packet in prep for transmission. 362 */ 363 m = ieee80211_encap(vap, ni, m); 364 if (m == NULL) { 365 /* NB: stat+msg handled in ieee80211_encap */ 366 ieee80211_free_node(ni); 367 continue; 368 } 369 } 370 371 error = ieee80211_handoff(parent, m); 372 if (error != 0) { 373 /* NB: IFQ_HANDOFF reclaims mbuf */ 374 ieee80211_free_node(ni); 375 } else { 376 IFNET_STAT_INC(ifp, opackets, 1); 377 } 378 ic->ic_lastdata = ticks; 379 } 380 #undef IS_DWDS 381 } 382 383 384 /* 385 * 802.11 output routine. This is (currently) used only to 386 * connect bpf write calls to the 802.11 layer for injecting 387 * raw 802.11 frames. 388 */ 389 int 390 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 391 struct sockaddr *dst, struct rtentry *rt) 392 { 393 #define senderr(e) do { error = (e); goto bad;} while (0) 394 struct ieee80211_node *ni = NULL; 395 struct ieee80211vap *vap; 396 struct ieee80211_frame *wh; 397 struct ifaltq_subque *ifsq; 398 int error; 399 400 ifsq = ifq_get_subq_default(&ifp->if_snd); 401 if (ifsq_is_oactive(ifsq)) { 402 /* 403 * Short-circuit requests if the vap is marked OACTIVE 404 * as this can happen because a packet came down through 405 * ieee80211_start before the vap entered RUN state in 406 * which case it's ok to just drop the frame. This 407 * should not be necessary but callers of if_output don't 408 * check OACTIVE. 409 */ 410 senderr(ENETDOWN); 411 } 412 vap = ifp->if_softc; 413 /* 414 * Hand to the 802.3 code if not tagged as 415 * a raw 802.11 frame. 416 */ 417 if (dst->sa_family != AF_IEEE80211) 418 return vap->iv_output(ifp, m, dst, rt); 419 #ifdef MAC 420 error = mac_ifnet_check_transmit(ifp, m); 421 if (error) 422 senderr(error); 423 #endif 424 if (ifp->if_flags & IFF_MONITOR) 425 senderr(ENETDOWN); 426 if (!IFNET_IS_UP_RUNNING(ifp)) 427 senderr(ENETDOWN); 428 if (vap->iv_state == IEEE80211_S_CAC) { 429 IEEE80211_DPRINTF(vap, 430 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 431 "block %s frame in CAC state\n", "raw data"); 432 vap->iv_stats.is_tx_badstate++; 433 senderr(EIO); /* XXX */ 434 } 435 /* XXX bypass bridge, pfil, carp, etc. */ 436 437 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 438 senderr(EIO); /* XXX */ 439 wh = mtod(m, struct ieee80211_frame *); 440 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 441 IEEE80211_FC0_VERSION_0) 442 senderr(EIO); /* XXX */ 443 444 /* locate destination node */ 445 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 446 case IEEE80211_FC1_DIR_NODS: 447 case IEEE80211_FC1_DIR_FROMDS: 448 ni = ieee80211_find_txnode(vap, wh->i_addr1); 449 break; 450 case IEEE80211_FC1_DIR_TODS: 451 case IEEE80211_FC1_DIR_DSTODS: 452 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 453 senderr(EIO); /* XXX */ 454 ni = ieee80211_find_txnode(vap, wh->i_addr3); 455 break; 456 default: 457 senderr(EIO); /* XXX */ 458 } 459 if (ni == NULL) { 460 /* 461 * Permit packets w/ bpf params through regardless 462 * (see below about sa_len). 463 */ 464 if (dst->sa_len == 0) 465 senderr(EHOSTUNREACH); 466 ni = ieee80211_ref_node(vap->iv_bss); 467 } 468 469 /* 470 * Sanitize mbuf for net80211 flags leaked from above. 471 * 472 * NB: This must be done before ieee80211_classify as 473 * it marks EAPOL in frames with M_EAPOL. 474 */ 475 m->m_flags &= ~M_80211_TX; 476 477 /* calculate priority so drivers can find the tx queue */ 478 /* XXX assumes an 802.3 frame */ 479 if (ieee80211_classify(ni, m)) 480 senderr(EIO); /* XXX */ 481 482 IFNET_STAT_INC(ifp, opackets, 1); 483 IEEE80211_NODE_STAT(ni, tx_data); 484 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 485 IEEE80211_NODE_STAT(ni, tx_mcast); 486 m->m_flags |= M_MCAST; 487 } else 488 IEEE80211_NODE_STAT(ni, tx_ucast); 489 /* NB: ieee80211_encap does not include 802.11 header */ 490 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len); 491 492 /* 493 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 494 * present by setting the sa_len field of the sockaddr (yes, 495 * this is a hack). 496 * NB: we assume sa_data is suitably aligned to cast. 497 */ 498 return vap->iv_ic->ic_raw_xmit(ni, m, 499 (const struct ieee80211_bpf_params *)(dst->sa_len ? 500 dst->sa_data : NULL)); 501 bad: 502 if (m != NULL) 503 m_freem(m); 504 if (ni != NULL) 505 ieee80211_free_node(ni); 506 IFNET_STAT_INC(ifp, oerrors, 1); 507 return error; 508 #undef senderr 509 } 510 511 /* 512 * Set the direction field and address fields of an outgoing 513 * frame. Note this should be called early on in constructing 514 * a frame as it sets i_fc[1]; other bits can then be or'd in. 515 */ 516 void 517 ieee80211_send_setup( 518 struct ieee80211_node *ni, 519 struct mbuf *m, 520 int type, int tid, 521 const uint8_t sa[IEEE80211_ADDR_LEN], 522 const uint8_t da[IEEE80211_ADDR_LEN], 523 const uint8_t bssid[IEEE80211_ADDR_LEN]) 524 { 525 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 526 struct ieee80211vap *vap = ni->ni_vap; 527 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 528 ieee80211_seq seqno; 529 530 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 531 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 532 switch (vap->iv_opmode) { 533 case IEEE80211_M_STA: 534 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 535 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 536 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 537 IEEE80211_ADDR_COPY(wh->i_addr3, da); 538 break; 539 case IEEE80211_M_IBSS: 540 case IEEE80211_M_AHDEMO: 541 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 542 IEEE80211_ADDR_COPY(wh->i_addr1, da); 543 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 544 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 545 break; 546 case IEEE80211_M_HOSTAP: 547 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 548 IEEE80211_ADDR_COPY(wh->i_addr1, da); 549 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 550 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 551 break; 552 case IEEE80211_M_WDS: 553 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 554 IEEE80211_ADDR_COPY(wh->i_addr1, da); 555 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 556 IEEE80211_ADDR_COPY(wh->i_addr3, da); 557 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 558 break; 559 case IEEE80211_M_MBSS: 560 #ifdef IEEE80211_SUPPORT_MESH 561 /* XXX add support for proxied addresses */ 562 if (IEEE80211_IS_MULTICAST(da)) { 563 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 564 /* XXX next hop */ 565 IEEE80211_ADDR_COPY(wh->i_addr1, da); 566 IEEE80211_ADDR_COPY(wh->i_addr2, 567 vap->iv_myaddr); 568 } else { 569 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 570 IEEE80211_ADDR_COPY(wh->i_addr1, da); 571 IEEE80211_ADDR_COPY(wh->i_addr2, 572 vap->iv_myaddr); 573 IEEE80211_ADDR_COPY(wh->i_addr3, da); 574 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 575 } 576 #endif 577 break; 578 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 579 break; 580 } 581 } else { 582 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 583 IEEE80211_ADDR_COPY(wh->i_addr1, da); 584 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 585 #ifdef IEEE80211_SUPPORT_MESH 586 if (vap->iv_opmode == IEEE80211_M_MBSS) 587 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 588 else 589 #endif 590 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 591 } 592 *(uint16_t *)&wh->i_dur[0] = 0; 593 594 seqno = ni->ni_txseqs[tid]++; 595 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 596 M_SEQNO_SET(m, seqno); 597 598 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 599 m->m_flags |= M_MCAST; 600 #undef WH4 601 } 602 603 /* 604 * Send a management frame to the specified node. The node pointer 605 * must have a reference as the pointer will be passed to the driver 606 * and potentially held for a long time. If the frame is successfully 607 * dispatched to the driver, then it is responsible for freeing the 608 * reference (and potentially free'ing up any associated storage); 609 * otherwise deal with reclaiming any reference (on error). 610 */ 611 int 612 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type, 613 struct ieee80211_bpf_params *params) 614 { 615 struct ieee80211vap *vap = ni->ni_vap; 616 struct ieee80211com *ic = ni->ni_ic; 617 struct ieee80211_frame *wh; 618 #ifdef IEEE80211_DEBUG 619 char ethstr[ETHER_ADDRSTRLEN + 1]; 620 #endif 621 KASSERT(ni != NULL, ("null node")); 622 623 if (vap->iv_state == IEEE80211_S_CAC) { 624 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 625 ni, "block %s frame in CAC state", 626 ieee80211_mgt_subtype_name[ 627 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 628 IEEE80211_FC0_SUBTYPE_SHIFT]); 629 vap->iv_stats.is_tx_badstate++; 630 ieee80211_free_node(ni); 631 m_freem(m); 632 return EIO; /* XXX */ 633 } 634 635 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 636 if (m == NULL) { 637 ieee80211_free_node(ni); 638 return ENOMEM; 639 } 640 641 wh = mtod(m, struct ieee80211_frame *); 642 ieee80211_send_setup(ni, m, 643 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID, 644 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 645 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) { 646 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1, 647 "encrypting frame (%s)", __func__); 648 wh->i_fc[1] |= IEEE80211_FC1_WEP; 649 } 650 m->m_flags |= M_ENCAP; /* mark encapsulated */ 651 652 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?")); 653 M_WME_SETAC(m, params->ibp_pri); 654 655 #ifdef IEEE80211_DEBUG 656 /* avoid printing too many frames */ 657 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) || 658 ieee80211_msg_dumppkts(vap)) { 659 kprintf("[%s] send %s on channel %u\n", 660 kether_ntoa(wh->i_addr1, ethstr), 661 ieee80211_mgt_subtype_name[ 662 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 663 IEEE80211_FC0_SUBTYPE_SHIFT], 664 ieee80211_chan2ieee(ic, ic->ic_curchan)); 665 } 666 #endif 667 IEEE80211_NODE_STAT(ni, tx_mgmt); 668 669 return ic->ic_raw_xmit(ni, m, params); 670 } 671 672 /* 673 * Send a null data frame to the specified node. If the station 674 * is setup for QoS then a QoS Null Data frame is constructed. 675 * If this is a WDS station then a 4-address frame is constructed. 676 * 677 * NB: the caller is assumed to have setup a node reference 678 * for use; this is necessary to deal with a race condition 679 * when probing for inactive stations. Like ieee80211_mgmt_output 680 * we must cleanup any node reference on error; however we 681 * can safely just unref it as we know it will never be the 682 * last reference to the node. 683 */ 684 int 685 ieee80211_send_nulldata(struct ieee80211_node *ni) 686 { 687 struct ieee80211vap *vap = ni->ni_vap; 688 struct ieee80211com *ic = ni->ni_ic; 689 struct mbuf *m; 690 struct ieee80211_frame *wh; 691 int hdrlen; 692 uint8_t *frm; 693 694 if (vap->iv_state == IEEE80211_S_CAC) { 695 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH, 696 ni, "block %s frame in CAC state", "null data"); 697 ieee80211_unref_node(&ni); 698 vap->iv_stats.is_tx_badstate++; 699 return EIO; /* XXX */ 700 } 701 702 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) 703 hdrlen = sizeof(struct ieee80211_qosframe); 704 else 705 hdrlen = sizeof(struct ieee80211_frame); 706 /* NB: only WDS vap's get 4-address frames */ 707 if (vap->iv_opmode == IEEE80211_M_WDS) 708 hdrlen += IEEE80211_ADDR_LEN; 709 if (ic->ic_flags & IEEE80211_F_DATAPAD) 710 hdrlen = roundup(hdrlen, sizeof(uint32_t)); 711 712 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0); 713 if (m == NULL) { 714 /* XXX debug msg */ 715 ieee80211_unref_node(&ni); 716 vap->iv_stats.is_tx_nobuf++; 717 return ENOMEM; 718 } 719 KASSERT(M_LEADINGSPACE(m) >= hdrlen, 720 ("leading space %zd", M_LEADINGSPACE(m))); 721 M_PREPEND(m, hdrlen, MB_DONTWAIT); 722 if (m == NULL) { 723 /* NB: cannot happen */ 724 ieee80211_free_node(ni); 725 return ENOMEM; 726 } 727 728 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */ 729 if (ni->ni_flags & IEEE80211_NODE_QOS) { 730 const int tid = WME_AC_TO_TID(WME_AC_BE); 731 uint8_t *qos; 732 733 ieee80211_send_setup(ni, m, 734 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL, 735 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 736 737 if (vap->iv_opmode == IEEE80211_M_WDS) 738 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 739 else 740 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 741 qos[0] = tid & IEEE80211_QOS_TID; 742 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy) 743 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 744 qos[1] = 0; 745 } else { 746 ieee80211_send_setup(ni, m, 747 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 748 IEEE80211_NONQOS_TID, 749 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid); 750 } 751 if (vap->iv_opmode != IEEE80211_M_WDS) { 752 /* NB: power management bit is never sent by an AP */ 753 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 754 vap->iv_opmode != IEEE80211_M_HOSTAP) 755 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 756 } 757 m->m_len = m->m_pkthdr.len = hdrlen; 758 m->m_flags |= M_ENCAP; /* mark encapsulated */ 759 760 M_WME_SETAC(m, WME_AC_BE); 761 762 IEEE80211_NODE_STAT(ni, tx_data); 763 764 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni, 765 "send %snull data frame on channel %u, pwr mgt %s", 766 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "", 767 ieee80211_chan2ieee(ic, ic->ic_curchan), 768 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 769 770 return ic->ic_raw_xmit(ni, m, NULL); 771 } 772 773 /* 774 * Assign priority to a frame based on any vlan tag assigned 775 * to the station and/or any Diffserv setting in an IP header. 776 * Finally, if an ACM policy is setup (in station mode) it's 777 * applied. 778 */ 779 int 780 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m) 781 { 782 const struct ether_header *eh = mtod(m, struct ether_header *); 783 int v_wme_ac, d_wme_ac, ac; 784 785 /* 786 * Always promote PAE/EAPOL frames to high priority. 787 */ 788 if (eh->ether_type == htons(ETHERTYPE_PAE)) { 789 /* NB: mark so others don't need to check header */ 790 m->m_flags |= M_EAPOL; 791 ac = WME_AC_VO; 792 goto done; 793 } 794 /* 795 * Non-qos traffic goes to BE. 796 */ 797 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 798 ac = WME_AC_BE; 799 goto done; 800 } 801 802 /* 803 * If node has a vlan tag then all traffic 804 * to it must have a matching tag. 805 */ 806 v_wme_ac = 0; 807 if (ni->ni_vlan != 0) { 808 if ((m->m_flags & M_VLANTAG) == 0) { 809 IEEE80211_NODE_STAT(ni, tx_novlantag); 810 return 1; 811 } 812 #ifdef __FreeBSD__ 813 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vlantag) != 814 EVL_VLANOFTAG(ni->ni_vlan)) { 815 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 816 return 1; 817 } 818 /* map vlan priority to AC */ 819 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 820 #endif 821 } 822 823 /* XXX m_copydata may be too slow for fast path */ 824 #ifdef INET 825 if (eh->ether_type == htons(ETHERTYPE_IP)) { 826 uint8_t tos; 827 /* 828 * IP frame, map the DSCP bits from the TOS field. 829 */ 830 /* NB: ip header may not be in first mbuf */ 831 m_copydata(m, sizeof(struct ether_header) + 832 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 833 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 834 d_wme_ac = TID_TO_WME_AC(tos); 835 } else { 836 #endif /* INET */ 837 #ifdef INET6 838 if (eh->ether_type == htons(ETHERTYPE_IPV6)) { 839 uint32_t flow; 840 uint8_t tos; 841 /* 842 * IPv6 frame, map the DSCP bits from the TOS field. 843 */ 844 m_copydata(m, sizeof(struct ether_header) + 845 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow), 846 (caddr_t) &flow); 847 tos = (uint8_t)(ntohl(flow) >> 20); 848 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 849 d_wme_ac = TID_TO_WME_AC(tos); 850 } else { 851 #endif /* INET6 */ 852 d_wme_ac = WME_AC_BE; 853 #ifdef INET6 854 } 855 #endif 856 #ifdef INET 857 } 858 #endif 859 /* 860 * Use highest priority AC. 861 */ 862 if (v_wme_ac > d_wme_ac) 863 ac = v_wme_ac; 864 else 865 ac = d_wme_ac; 866 867 /* 868 * Apply ACM policy. 869 */ 870 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) { 871 static const int acmap[4] = { 872 WME_AC_BK, /* WME_AC_BE */ 873 WME_AC_BK, /* WME_AC_BK */ 874 WME_AC_BE, /* WME_AC_VI */ 875 WME_AC_VI, /* WME_AC_VO */ 876 }; 877 struct ieee80211com *ic = ni->ni_ic; 878 879 while (ac != WME_AC_BK && 880 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 881 ac = acmap[ac]; 882 } 883 done: 884 M_WME_SETAC(m, ac); 885 return 0; 886 } 887 888 /* 889 * Insure there is sufficient contiguous space to encapsulate the 890 * 802.11 data frame. If room isn't already there, arrange for it. 891 * Drivers and cipher modules assume we have done the necessary work 892 * and fail rudely if they don't find the space they need. 893 */ 894 struct mbuf * 895 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize, 896 struct ieee80211_key *key, struct mbuf *m) 897 { 898 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 899 struct mbuf *mnew = NULL; 900 int needed_space = vap->iv_ic->ic_headroom + hdrsize; 901 902 if (key != NULL) { 903 /* XXX belongs in crypto code? */ 904 needed_space += key->wk_cipher->ic_header; 905 /* XXX frags */ 906 /* 907 * When crypto is being done in the host we must insure 908 * the data are writable for the cipher routines; clone 909 * a writable mbuf chain. 910 * XXX handle SWMIC specially 911 */ 912 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) { 913 mnew = m_dup(m, MB_DONTWAIT); 914 if (m == NULL) { 915 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 916 "%s: cannot get writable mbuf\n", __func__); 917 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */ 918 return NULL; 919 } 920 m_freem(m); 921 m = mnew; 922 } 923 } 924 /* 925 * We know we are called just before stripping an Ethernet 926 * header and prepending an LLC header. This means we know 927 * there will be 928 * sizeof(struct ether_header) - sizeof(struct llc) 929 * bytes recovered to which we need additional space for the 930 * 802.11 header and any crypto header. 931 */ 932 /* XXX check trailing space and copy instead? */ 933 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 934 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type); 935 if (n == NULL) { 936 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT, 937 "%s: cannot expand storage\n", __func__); 938 vap->iv_stats.is_tx_nobuf++; 939 m_freem(m); 940 return NULL; 941 } 942 KASSERT(needed_space <= MHLEN, 943 ("not enough room, need %u got %zu", needed_space, MHLEN)); 944 /* 945 * Setup new mbuf to have leading space to prepend the 946 * 802.11 header and any crypto header bits that are 947 * required (the latter are added when the driver calls 948 * back to ieee80211_crypto_encap to do crypto encapsulation). 949 */ 950 /* NB: must be first 'cuz it clobbers m_data */ 951 m_move_pkthdr(n, m); 952 n->m_len = 0; /* NB: m_gethdr does not set */ 953 n->m_data += needed_space; 954 /* 955 * Pull up Ethernet header to create the expected layout. 956 * We could use m_pullup but that's overkill (i.e. we don't 957 * need the actual data) and it cannot fail so do it inline 958 * for speed. 959 */ 960 /* NB: struct ether_header is known to be contiguous */ 961 n->m_len += sizeof(struct ether_header); 962 m->m_len -= sizeof(struct ether_header); 963 m->m_data += sizeof(struct ether_header); 964 /* 965 * Replace the head of the chain. 966 */ 967 n->m_next = m; 968 m = n; 969 } 970 return m; 971 #undef TO_BE_RECLAIMED 972 } 973 974 /* 975 * Return the transmit key to use in sending a unicast frame. 976 * If a unicast key is set we use that. When no unicast key is set 977 * we fall back to the default transmit key. 978 */ 979 static __inline struct ieee80211_key * 980 ieee80211_crypto_getucastkey(struct ieee80211vap *vap, 981 struct ieee80211_node *ni) 982 { 983 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 984 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 985 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 986 return NULL; 987 return &vap->iv_nw_keys[vap->iv_def_txkey]; 988 } else { 989 return &ni->ni_ucastkey; 990 } 991 } 992 993 /* 994 * Return the transmit key to use in sending a multicast frame. 995 * Multicast traffic always uses the group key which is installed as 996 * the default tx key. 997 */ 998 static __inline struct ieee80211_key * 999 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap, 1000 struct ieee80211_node *ni) 1001 { 1002 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE || 1003 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey])) 1004 return NULL; 1005 return &vap->iv_nw_keys[vap->iv_def_txkey]; 1006 } 1007 1008 /* 1009 * Encapsulate an outbound data frame. The mbuf chain is updated. 1010 * If an error is encountered NULL is returned. The caller is required 1011 * to provide a node reference and pullup the ethernet header in the 1012 * first mbuf. 1013 * 1014 * NB: Packet is assumed to be processed by ieee80211_classify which 1015 * marked EAPOL frames w/ M_EAPOL. 1016 */ 1017 struct mbuf * 1018 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni, 1019 struct mbuf *m) 1020 { 1021 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh)) 1022 struct ieee80211com *ic = ni->ni_ic; 1023 #ifdef IEEE80211_SUPPORT_MESH 1024 struct ieee80211_mesh_state *ms = vap->iv_mesh; 1025 struct ieee80211_meshcntl_ae10 *mc; 1026 #endif 1027 struct ether_header eh; 1028 struct ieee80211_frame *wh; 1029 struct ieee80211_key *key; 1030 struct llc *llc; 1031 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr; 1032 ieee80211_seq seqno; 1033 int meshhdrsize, meshae; 1034 uint8_t *qos; 1035 1036 /* 1037 * Copy existing Ethernet header to a safe place. The 1038 * rest of the code assumes it's ok to strip it when 1039 * reorganizing state for the final encapsulation. 1040 */ 1041 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 1042 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t)); 1043 1044 /* 1045 * Insure space for additional headers. First identify 1046 * transmit key to use in calculating any buffer adjustments 1047 * required. This is also used below to do privacy 1048 * encapsulation work. Then calculate the 802.11 header 1049 * size and any padding required by the driver. 1050 * 1051 * Note key may be NULL if we fall back to the default 1052 * transmit key and that is not set. In that case the 1053 * buffer may not be expanded as needed by the cipher 1054 * routines, but they will/should discard it. 1055 */ 1056 if (vap->iv_flags & IEEE80211_F_PRIVACY) { 1057 if (vap->iv_opmode == IEEE80211_M_STA || 1058 !IEEE80211_IS_MULTICAST(eh.ether_dhost) || 1059 (vap->iv_opmode == IEEE80211_M_WDS && 1060 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))) 1061 key = ieee80211_crypto_getucastkey(vap, ni); 1062 else 1063 key = ieee80211_crypto_getmcastkey(vap, ni); 1064 if (key == NULL && (m->m_flags & M_EAPOL) == 0) { 1065 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, 1066 eh.ether_dhost, 1067 "no default transmit key (%s) deftxkey %u", 1068 __func__, vap->iv_def_txkey); 1069 vap->iv_stats.is_tx_nodefkey++; 1070 goto bad; 1071 } 1072 } else 1073 key = NULL; 1074 /* 1075 * XXX Some ap's don't handle QoS-encapsulated EAPOL 1076 * frames so suppress use. This may be an issue if other 1077 * ap's require all data frames to be QoS-encapsulated 1078 * once negotiated in which case we'll need to make this 1079 * configurable. 1080 */ 1081 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 1082 (m->m_flags & M_EAPOL) == 0; 1083 if (addqos) 1084 hdrsize = sizeof(struct ieee80211_qosframe); 1085 else 1086 hdrsize = sizeof(struct ieee80211_frame); 1087 #ifdef IEEE80211_SUPPORT_MESH 1088 if (vap->iv_opmode == IEEE80211_M_MBSS) { 1089 /* 1090 * Mesh data frames are encapsulated according to the 1091 * rules of Section 11B.8.5 (p.139 of D3.0 spec). 1092 * o Group Addressed data (aka multicast) originating 1093 * at the local sta are sent w/ 3-address format and 1094 * address extension mode 00 1095 * o Individually Addressed data (aka unicast) originating 1096 * at the local sta are sent w/ 4-address format and 1097 * address extension mode 00 1098 * o Group Addressed data forwarded from a non-mesh sta are 1099 * sent w/ 3-address format and address extension mode 01 1100 * o Individually Address data from another sta are sent 1101 * w/ 4-address format and address extension mode 10 1102 */ 1103 is4addr = 0; /* NB: don't use, disable */ 1104 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1105 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */ 1106 meshhdrsize = sizeof(struct ieee80211_meshcntl); 1107 /* XXX defines for AE modes */ 1108 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) { 1109 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) 1110 meshae = 0; 1111 else 1112 meshae = 4; /* NB: pseudo */ 1113 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) { 1114 meshae = 1; 1115 meshhdrsize += 1*IEEE80211_ADDR_LEN; 1116 } else { 1117 meshae = 2; 1118 meshhdrsize += 2*IEEE80211_ADDR_LEN; 1119 } 1120 } else { 1121 #endif 1122 /* 1123 * 4-address frames need to be generated for: 1124 * o packets sent through a WDS vap (IEEE80211_M_WDS) 1125 * o packets sent through a vap marked for relaying 1126 * (e.g. a station operating with dynamic WDS) 1127 */ 1128 is4addr = vap->iv_opmode == IEEE80211_M_WDS || 1129 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) && 1130 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)); 1131 if (is4addr) 1132 hdrsize += IEEE80211_ADDR_LEN; 1133 meshhdrsize = meshae = 0; 1134 #ifdef IEEE80211_SUPPORT_MESH 1135 } 1136 #endif 1137 /* 1138 * Honor driver DATAPAD requirement. 1139 */ 1140 if (ic->ic_flags & IEEE80211_F_DATAPAD) 1141 hdrspace = roundup(hdrsize, sizeof(uint32_t)); 1142 else 1143 hdrspace = hdrsize; 1144 1145 if (__predict_true((m->m_flags & M_FF) == 0)) { 1146 /* 1147 * Normal frame. 1148 */ 1149 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m); 1150 if (m == NULL) { 1151 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 1152 goto bad; 1153 } 1154 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 1155 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1156 llc = mtod(m, struct llc *); 1157 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1158 llc->llc_control = LLC_UI; 1159 llc->llc_snap.org_code[0] = 0; 1160 llc->llc_snap.org_code[1] = 0; 1161 llc->llc_snap.org_code[2] = 0; 1162 llc->llc_snap.ether_type = eh.ether_type; 1163 } else { 1164 #ifdef IEEE80211_SUPPORT_SUPERG 1165 /* 1166 * Aggregated frame. 1167 */ 1168 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key); 1169 if (m == NULL) 1170 #endif 1171 goto bad; 1172 } 1173 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 1174 1175 M_PREPEND(m, hdrspace + meshhdrsize, MB_DONTWAIT); 1176 if (m == NULL) { 1177 vap->iv_stats.is_tx_nobuf++; 1178 goto bad; 1179 } 1180 wh = mtod(m, struct ieee80211_frame *); 1181 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 1182 *(uint16_t *)wh->i_dur = 0; 1183 qos = NULL; /* NB: quiet compiler */ 1184 if (is4addr) { 1185 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1186 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1187 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1188 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1189 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1190 } else switch (vap->iv_opmode) { 1191 case IEEE80211_M_STA: 1192 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 1193 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 1194 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1195 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1196 break; 1197 case IEEE80211_M_IBSS: 1198 case IEEE80211_M_AHDEMO: 1199 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 1200 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1201 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 1202 /* 1203 * NB: always use the bssid from iv_bss as the 1204 * neighbor's may be stale after an ibss merge 1205 */ 1206 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid); 1207 break; 1208 case IEEE80211_M_HOSTAP: 1209 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1210 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1211 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 1212 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1213 break; 1214 #ifdef IEEE80211_SUPPORT_MESH 1215 case IEEE80211_M_MBSS: 1216 /* NB: offset by hdrspace to deal with DATAPAD */ 1217 mc = (struct ieee80211_meshcntl_ae10 *) 1218 (mtod(m, uint8_t *) + hdrspace); 1219 switch (meshae) { 1220 case 0: /* ucast, no proxy */ 1221 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1222 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1223 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1224 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1225 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost); 1226 mc->mc_flags = 0; 1227 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1228 break; 1229 case 4: /* mcast, no proxy */ 1230 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1231 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1232 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1233 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 1234 mc->mc_flags = 0; /* NB: AE is really 0 */ 1235 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1236 break; 1237 case 1: /* mcast, proxy */ 1238 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 1239 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 1240 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1241 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr); 1242 mc->mc_flags = 1; 1243 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost); 1244 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1245 break; 1246 case 2: /* ucast, proxy */ 1247 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 1248 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr); 1249 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 1250 /* XXX not right, need MeshDA */ 1251 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 1252 /* XXX assume are MeshSA */ 1253 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr); 1254 mc->mc_flags = 2; 1255 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost); 1256 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost); 1257 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1258 break; 1259 default: 1260 KASSERT(0, ("meshae %d", meshae)); 1261 break; 1262 } 1263 mc->mc_ttl = ms->ms_ttl; 1264 ms->ms_seq++; 1265 LE_WRITE_4(mc->mc_seq, ms->ms_seq); 1266 break; 1267 #endif 1268 case IEEE80211_M_WDS: /* NB: is4addr should always be true */ 1269 default: 1270 goto bad; 1271 } 1272 if (m->m_flags & M_MORE_DATA) 1273 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 1274 if (addqos) { 1275 int ac, tid; 1276 1277 if (is4addr) { 1278 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos; 1279 /* NB: mesh case handled earlier */ 1280 } else if (vap->iv_opmode != IEEE80211_M_MBSS) 1281 qos = ((struct ieee80211_qosframe *) wh)->i_qos; 1282 ac = M_WME_GETAC(m); 1283 /* map from access class/queue to 11e header priorty value */ 1284 tid = WME_AC_TO_TID(ac); 1285 qos[0] = tid & IEEE80211_QOS_TID; 1286 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 1287 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 1288 qos[1] = 0; 1289 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 1290 1291 if ((m->m_flags & M_AMPDU_MPDU) == 0) { 1292 /* 1293 * NB: don't assign a sequence # to potential 1294 * aggregates; we expect this happens at the 1295 * point the frame comes off any aggregation q 1296 * as otherwise we may introduce holes in the 1297 * BA sequence space and/or make window accouting 1298 * more difficult. 1299 * 1300 * XXX may want to control this with a driver 1301 * capability; this may also change when we pull 1302 * aggregation up into net80211 1303 */ 1304 seqno = ni->ni_txseqs[tid]++; 1305 *(uint16_t *)wh->i_seq = 1306 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1307 M_SEQNO_SET(m, seqno); 1308 } 1309 } else { 1310 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 1311 *(uint16_t *)wh->i_seq = 1312 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT); 1313 M_SEQNO_SET(m, seqno); 1314 } 1315 1316 1317 /* check if xmit fragmentation is required */ 1318 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold && 1319 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1320 (vap->iv_caps & IEEE80211_C_TXFRAG) && 1321 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0); 1322 if (key != NULL) { 1323 /* 1324 * IEEE 802.1X: send EAPOL frames always in the clear. 1325 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 1326 */ 1327 if ((m->m_flags & M_EAPOL) == 0 || 1328 ((vap->iv_flags & IEEE80211_F_WPA) && 1329 (vap->iv_opmode == IEEE80211_M_STA ? 1330 !IEEE80211_KEY_UNDEFINED(key) : 1331 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 1332 wh->i_fc[1] |= IEEE80211_FC1_WEP; 1333 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) { 1334 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, 1335 eh.ether_dhost, 1336 "%s", "enmic failed, discard frame"); 1337 vap->iv_stats.is_crypto_enmicfail++; 1338 goto bad; 1339 } 1340 } 1341 } 1342 if (txfrag && !ieee80211_fragment(vap, m, hdrsize, 1343 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold)) 1344 goto bad; 1345 1346 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1347 1348 IEEE80211_NODE_STAT(ni, tx_data); 1349 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) { 1350 IEEE80211_NODE_STAT(ni, tx_mcast); 1351 m->m_flags |= M_MCAST; 1352 } else 1353 IEEE80211_NODE_STAT(ni, tx_ucast); 1354 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 1355 1356 return m; 1357 bad: 1358 if (m != NULL) 1359 m_freem(m); 1360 return NULL; 1361 #undef WH4 1362 } 1363 1364 /* 1365 * Fragment the frame according to the specified mtu. 1366 * The size of the 802.11 header (w/o padding) is provided 1367 * so we don't need to recalculate it. We create a new 1368 * mbuf for each fragment and chain it through m_nextpkt; 1369 * we might be able to optimize this by reusing the original 1370 * packet's mbufs but that is significantly more complicated. 1371 */ 1372 static int 1373 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0, 1374 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1375 { 1376 struct ieee80211_frame *wh, *whf; 1377 struct mbuf *m, *prev, *next; 1378 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1379 1380 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1381 KASSERT(m0->m_pkthdr.len > mtu, 1382 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1383 1384 wh = mtod(m0, struct ieee80211_frame *); 1385 /* NB: mark the first frag; it will be propagated below */ 1386 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1387 totalhdrsize = hdrsize + ciphdrsize; 1388 fragno = 1; 1389 off = mtu - ciphdrsize; 1390 remainder = m0->m_pkthdr.len - off; 1391 prev = m0; 1392 do { 1393 fragsize = totalhdrsize + remainder; 1394 if (fragsize > mtu) 1395 fragsize = mtu; 1396 /* XXX fragsize can be >2048! */ 1397 KASSERT(fragsize < MCLBYTES, 1398 ("fragment size %u too big!", fragsize)); 1399 if (fragsize > MHLEN) 1400 m = m_getcl(MB_DONTWAIT, MT_DATA, M_PKTHDR); 1401 else 1402 m = m_gethdr(MB_DONTWAIT, MT_DATA); 1403 if (m == NULL) 1404 goto bad; 1405 /* leave room to prepend any cipher header */ 1406 m_align(m, fragsize - ciphdrsize); 1407 1408 /* 1409 * Form the header in the fragment. Note that since 1410 * we mark the first fragment with the MORE_FRAG bit 1411 * it automatically is propagated to each fragment; we 1412 * need only clear it on the last fragment (done below). 1413 */ 1414 whf = mtod(m, struct ieee80211_frame *); 1415 memcpy(whf, wh, hdrsize); 1416 *(uint16_t *)&whf->i_seq[0] |= htole16( 1417 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1418 IEEE80211_SEQ_FRAG_SHIFT); 1419 fragno++; 1420 1421 payload = fragsize - totalhdrsize; 1422 /* NB: destination is known to be contiguous */ 1423 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize); 1424 m->m_len = hdrsize + payload; 1425 m->m_pkthdr.len = hdrsize + payload; 1426 m->m_flags |= M_FRAG; 1427 m->m_pkthdr.rcvif = m0->m_pkthdr.rcvif; 1428 1429 /* chain up the fragment */ 1430 prev->m_nextpkt = m; 1431 prev = m; 1432 1433 /* deduct fragment just formed */ 1434 remainder -= payload; 1435 off += payload; 1436 } while (remainder != 0); 1437 1438 /* set the last fragment */ 1439 m->m_flags |= M_LASTFRAG; 1440 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1441 1442 /* strip first mbuf now that everything has been copied */ 1443 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1444 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1445 1446 vap->iv_stats.is_tx_fragframes++; 1447 vap->iv_stats.is_tx_frags += fragno-1; 1448 1449 return 1; 1450 bad: 1451 /* reclaim fragments but leave original frame for caller to free */ 1452 for (m = m0->m_nextpkt; m != NULL; m = next) { 1453 next = m->m_nextpkt; 1454 m->m_nextpkt = NULL; /* XXX paranoid */ 1455 m_freem(m); 1456 } 1457 m0->m_nextpkt = NULL; 1458 return 0; 1459 } 1460 1461 /* 1462 * Add a supported rates element id to a frame. 1463 */ 1464 uint8_t * 1465 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1466 { 1467 int nrates; 1468 1469 *frm++ = IEEE80211_ELEMID_RATES; 1470 nrates = rs->rs_nrates; 1471 if (nrates > IEEE80211_RATE_SIZE) 1472 nrates = IEEE80211_RATE_SIZE; 1473 *frm++ = nrates; 1474 memcpy(frm, rs->rs_rates, nrates); 1475 return frm + nrates; 1476 } 1477 1478 /* 1479 * Add an extended supported rates element id to a frame. 1480 */ 1481 uint8_t * 1482 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1483 { 1484 /* 1485 * Add an extended supported rates element if operating in 11g mode. 1486 */ 1487 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1488 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1489 *frm++ = IEEE80211_ELEMID_XRATES; 1490 *frm++ = nrates; 1491 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1492 frm += nrates; 1493 } 1494 return frm; 1495 } 1496 1497 /* 1498 * Add an ssid element to a frame. 1499 */ 1500 static uint8_t * 1501 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1502 { 1503 *frm++ = IEEE80211_ELEMID_SSID; 1504 *frm++ = len; 1505 memcpy(frm, ssid, len); 1506 return frm + len; 1507 } 1508 1509 /* 1510 * Add an erp element to a frame. 1511 */ 1512 static uint8_t * 1513 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1514 { 1515 uint8_t erp; 1516 1517 *frm++ = IEEE80211_ELEMID_ERP; 1518 *frm++ = 1; 1519 erp = 0; 1520 if (ic->ic_nonerpsta != 0) 1521 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1522 if (ic->ic_flags & IEEE80211_F_USEPROT) 1523 erp |= IEEE80211_ERP_USE_PROTECTION; 1524 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1525 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1526 *frm++ = erp; 1527 return frm; 1528 } 1529 1530 /* 1531 * Add a CFParams element to a frame. 1532 */ 1533 static uint8_t * 1534 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic) 1535 { 1536 #define ADDSHORT(frm, v) do { \ 1537 LE_WRITE_2(frm, v); \ 1538 frm += 2; \ 1539 } while (0) 1540 *frm++ = IEEE80211_ELEMID_CFPARMS; 1541 *frm++ = 6; 1542 *frm++ = 0; /* CFP count */ 1543 *frm++ = 2; /* CFP period */ 1544 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */ 1545 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */ 1546 return frm; 1547 #undef ADDSHORT 1548 } 1549 1550 static __inline uint8_t * 1551 add_appie(uint8_t *frm, const struct ieee80211_appie *ie) 1552 { 1553 memcpy(frm, ie->ie_data, ie->ie_len); 1554 return frm + ie->ie_len; 1555 } 1556 1557 static __inline uint8_t * 1558 add_ie(uint8_t *frm, const uint8_t *ie) 1559 { 1560 memcpy(frm, ie, 2 + ie[1]); 1561 return frm + 2 + ie[1]; 1562 } 1563 1564 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1565 /* 1566 * Add a WME information element to a frame. 1567 */ 1568 static uint8_t * 1569 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1570 { 1571 static const struct ieee80211_wme_info info = { 1572 .wme_id = IEEE80211_ELEMID_VENDOR, 1573 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1574 .wme_oui = { WME_OUI_BYTES }, 1575 .wme_type = WME_OUI_TYPE, 1576 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1577 .wme_version = WME_VERSION, 1578 .wme_info = 0, 1579 }; 1580 memcpy(frm, &info, sizeof(info)); 1581 return frm + sizeof(info); 1582 } 1583 1584 /* 1585 * Add a WME parameters element to a frame. 1586 */ 1587 static uint8_t * 1588 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1589 { 1590 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1591 #define ADDSHORT(frm, v) do { \ 1592 LE_WRITE_2(frm, v); \ 1593 frm += 2; \ 1594 } while (0) 1595 /* NB: this works 'cuz a param has an info at the front */ 1596 static const struct ieee80211_wme_info param = { 1597 .wme_id = IEEE80211_ELEMID_VENDOR, 1598 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1599 .wme_oui = { WME_OUI_BYTES }, 1600 .wme_type = WME_OUI_TYPE, 1601 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1602 .wme_version = WME_VERSION, 1603 }; 1604 int i; 1605 1606 memcpy(frm, ¶m, sizeof(param)); 1607 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1608 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1609 *frm++ = 0; /* reserved field */ 1610 for (i = 0; i < WME_NUM_AC; i++) { 1611 const struct wmeParams *ac = 1612 &wme->wme_bssChanParams.cap_wmeParams[i]; 1613 *frm++ = SM(i, WME_PARAM_ACI) 1614 | SM(ac->wmep_acm, WME_PARAM_ACM) 1615 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1616 ; 1617 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1618 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1619 ; 1620 ADDSHORT(frm, ac->wmep_txopLimit); 1621 } 1622 return frm; 1623 #undef SM 1624 #undef ADDSHORT 1625 } 1626 #undef WME_OUI_BYTES 1627 1628 /* 1629 * Add an 11h Power Constraint element to a frame. 1630 */ 1631 static uint8_t * 1632 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap) 1633 { 1634 const struct ieee80211_channel *c = vap->iv_bss->ni_chan; 1635 /* XXX per-vap tx power limit? */ 1636 int8_t limit = vap->iv_ic->ic_txpowlimit / 2; 1637 1638 frm[0] = IEEE80211_ELEMID_PWRCNSTR; 1639 frm[1] = 1; 1640 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0; 1641 return frm + 3; 1642 } 1643 1644 /* 1645 * Add an 11h Power Capability element to a frame. 1646 */ 1647 static uint8_t * 1648 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c) 1649 { 1650 frm[0] = IEEE80211_ELEMID_PWRCAP; 1651 frm[1] = 2; 1652 frm[2] = c->ic_minpower; 1653 frm[3] = c->ic_maxpower; 1654 return frm + 4; 1655 } 1656 1657 /* 1658 * Add an 11h Supported Channels element to a frame. 1659 */ 1660 static uint8_t * 1661 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic) 1662 { 1663 static const int ielen = 26; 1664 1665 frm[0] = IEEE80211_ELEMID_SUPPCHAN; 1666 frm[1] = ielen; 1667 /* XXX not correct */ 1668 memcpy(frm+2, ic->ic_chan_avail, ielen); 1669 return frm + 2 + ielen; 1670 } 1671 1672 /* 1673 * Add an 11h Channel Switch Announcement element to a frame. 1674 * Note that we use the per-vap CSA count to adjust the global 1675 * counter so we can use this routine to form probe response 1676 * frames and get the current count. 1677 */ 1678 static uint8_t * 1679 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap) 1680 { 1681 struct ieee80211com *ic = vap->iv_ic; 1682 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm; 1683 1684 csa->csa_ie = IEEE80211_ELEMID_CSA; 1685 csa->csa_len = 3; 1686 csa->csa_mode = 1; /* XXX force quiet on channel */ 1687 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan); 1688 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count; 1689 return frm + sizeof(*csa); 1690 } 1691 1692 /* 1693 * Add an 11h country information element to a frame. 1694 */ 1695 static uint8_t * 1696 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic) 1697 { 1698 1699 if (ic->ic_countryie == NULL || 1700 ic->ic_countryie_chan != ic->ic_bsschan) { 1701 /* 1702 * Handle lazy construction of ie. This is done on 1703 * first use and after a channel change that requires 1704 * re-calculation. 1705 */ 1706 if (ic->ic_countryie != NULL) 1707 kfree(ic->ic_countryie, M_80211_NODE_IE); 1708 ic->ic_countryie = ieee80211_alloc_countryie(ic); 1709 if (ic->ic_countryie == NULL) 1710 return frm; 1711 ic->ic_countryie_chan = ic->ic_bsschan; 1712 } 1713 return add_appie(frm, ic->ic_countryie); 1714 } 1715 1716 /* 1717 * Send a probe request frame with the specified ssid 1718 * and any optional information element data. 1719 */ 1720 int 1721 ieee80211_send_probereq(struct ieee80211_node *ni, 1722 const uint8_t sa[IEEE80211_ADDR_LEN], 1723 const uint8_t da[IEEE80211_ADDR_LEN], 1724 const uint8_t bssid[IEEE80211_ADDR_LEN], 1725 const uint8_t *ssid, size_t ssidlen) 1726 { 1727 struct ieee80211vap *vap = ni->ni_vap; 1728 struct ieee80211com *ic = ni->ni_ic; 1729 const struct ieee80211_txparam *tp; 1730 struct ieee80211_bpf_params params; 1731 const struct ieee80211_rateset *rs; 1732 struct mbuf *m; 1733 uint8_t *frm; 1734 #ifdef IEEE80211_DEBUG 1735 char ethstr[ETHER_ADDRSTRLEN + 1]; 1736 #endif 1737 1738 if (vap->iv_state == IEEE80211_S_CAC) { 1739 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni, 1740 "block %s frame in CAC state", "probe request"); 1741 vap->iv_stats.is_tx_badstate++; 1742 return EIO; /* XXX */ 1743 } 1744 1745 /* 1746 * Hold a reference on the node so it doesn't go away until after 1747 * the xmit is complete all the way in the driver. On error we 1748 * will remove our reference. 1749 */ 1750 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1751 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1752 __func__, __LINE__, 1753 ni, kether_ntoa(ni->ni_macaddr, ethstr), 1754 ieee80211_node_refcnt(ni)+1); 1755 ieee80211_ref_node(ni); 1756 1757 /* 1758 * prreq frame format 1759 * [tlv] ssid 1760 * [tlv] supported rates 1761 * [tlv] RSN (optional) 1762 * [tlv] extended supported rates 1763 * [tlv] WPA (optional) 1764 * [tlv] user-specified ie's 1765 */ 1766 m = ieee80211_getmgtframe(&frm, 1767 ic->ic_headroom + sizeof(struct ieee80211_frame), 1768 2 + IEEE80211_NWID_LEN 1769 + 2 + IEEE80211_RATE_SIZE 1770 + sizeof(struct ieee80211_ie_wpa) 1771 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1772 + sizeof(struct ieee80211_ie_wpa) 1773 + (vap->iv_appie_probereq != NULL ? 1774 vap->iv_appie_probereq->ie_len : 0) 1775 ); 1776 if (m == NULL) { 1777 vap->iv_stats.is_tx_nobuf++; 1778 ieee80211_free_node(ni); 1779 return ENOMEM; 1780 } 1781 1782 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1783 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1784 frm = ieee80211_add_rates(frm, rs); 1785 if (vap->iv_flags & IEEE80211_F_WPA2) { 1786 if (vap->iv_rsn_ie != NULL) 1787 frm = add_ie(frm, vap->iv_rsn_ie); 1788 /* XXX else complain? */ 1789 } 1790 frm = ieee80211_add_xrates(frm, rs); 1791 if (vap->iv_flags & IEEE80211_F_WPA1) { 1792 if (vap->iv_wpa_ie != NULL) 1793 frm = add_ie(frm, vap->iv_wpa_ie); 1794 /* XXX else complain? */ 1795 } 1796 if (vap->iv_appie_probereq != NULL) 1797 frm = add_appie(frm, vap->iv_appie_probereq); 1798 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1799 1800 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame), 1801 ("leading space %zd", M_LEADINGSPACE(m))); 1802 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 1803 if (m == NULL) { 1804 /* NB: cannot happen */ 1805 ieee80211_free_node(ni); 1806 return ENOMEM; 1807 } 1808 1809 ieee80211_send_setup(ni, m, 1810 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1811 IEEE80211_NONQOS_TID, sa, da, bssid); 1812 /* XXX power management? */ 1813 m->m_flags |= M_ENCAP; /* mark encapsulated */ 1814 1815 M_WME_SETAC(m, WME_AC_BE); 1816 1817 IEEE80211_NODE_STAT(ni, tx_probereq); 1818 IEEE80211_NODE_STAT(ni, tx_mgmt); 1819 1820 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1821 "send probe req on channel %u bssid %s ssid \"%.*s\"\n", 1822 ieee80211_chan2ieee(ic, ic->ic_curchan), kether_ntoa(bssid, ethstr), 1823 (int)ssidlen, ssid); 1824 1825 memset(¶ms, 0, sizeof(params)); 1826 params.ibp_pri = M_WME_GETAC(m); 1827 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)]; 1828 params.ibp_rate0 = tp->mgmtrate; 1829 if (IEEE80211_IS_MULTICAST(da)) { 1830 params.ibp_flags |= IEEE80211_BPF_NOACK; 1831 params.ibp_try0 = 1; 1832 } else 1833 params.ibp_try0 = tp->maxretry; 1834 params.ibp_power = ni->ni_txpower; 1835 return ic->ic_raw_xmit(ni, m, ¶ms); 1836 } 1837 1838 /* 1839 * Calculate capability information for mgt frames. 1840 */ 1841 uint16_t 1842 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan) 1843 { 1844 struct ieee80211com *ic = vap->iv_ic; 1845 uint16_t capinfo; 1846 1847 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode")); 1848 1849 if (vap->iv_opmode == IEEE80211_M_HOSTAP) 1850 capinfo = IEEE80211_CAPINFO_ESS; 1851 else if (vap->iv_opmode == IEEE80211_M_IBSS) 1852 capinfo = IEEE80211_CAPINFO_IBSS; 1853 else 1854 capinfo = 0; 1855 if (vap->iv_flags & IEEE80211_F_PRIVACY) 1856 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1857 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1858 IEEE80211_IS_CHAN_2GHZ(chan)) 1859 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1860 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1861 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1862 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH)) 1863 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 1864 return capinfo; 1865 } 1866 1867 /* 1868 * Send a management frame. The node is for the destination (or ic_bss 1869 * when in station mode). Nodes other than ic_bss have their reference 1870 * count bumped to reflect our use for an indeterminant time. 1871 */ 1872 int 1873 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg) 1874 { 1875 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1876 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0) 1877 struct ieee80211vap *vap = ni->ni_vap; 1878 struct ieee80211com *ic = ni->ni_ic; 1879 struct ieee80211_node *bss = vap->iv_bss; 1880 struct ieee80211_bpf_params params; 1881 struct mbuf *m; 1882 uint8_t *frm; 1883 uint16_t capinfo; 1884 int has_challenge, is_shared_key, ret, status; 1885 #ifdef IEEE80211_DEBUG 1886 char ethstr[ETHER_ADDRSTRLEN + 1]; 1887 #endif 1888 1889 KASSERT(ni != NULL, ("null node")); 1890 1891 /* 1892 * Hold a reference on the node so it doesn't go away until after 1893 * the xmit is complete all the way in the driver. On error we 1894 * will remove our reference. 1895 */ 1896 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 1897 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1898 __func__, __LINE__, 1899 ni, kether_ntoa(ni->ni_macaddr, ethstr), 1900 ieee80211_node_refcnt(ni)+1); 1901 ieee80211_ref_node(ni); 1902 1903 memset(¶ms, 0, sizeof(params)); 1904 switch (type) { 1905 1906 case IEEE80211_FC0_SUBTYPE_AUTH: 1907 status = arg >> 16; 1908 arg &= 0xffff; 1909 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1910 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1911 ni->ni_challenge != NULL); 1912 1913 /* 1914 * Deduce whether we're doing open authentication or 1915 * shared key authentication. We do the latter if 1916 * we're in the middle of a shared key authentication 1917 * handshake or if we're initiating an authentication 1918 * request and configured to use shared key. 1919 */ 1920 is_shared_key = has_challenge || 1921 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1922 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1923 bss->ni_authmode == IEEE80211_AUTH_SHARED); 1924 1925 m = ieee80211_getmgtframe(&frm, 1926 ic->ic_headroom + sizeof(struct ieee80211_frame), 1927 3 * sizeof(uint16_t) 1928 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1929 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1930 ); 1931 if (m == NULL) 1932 senderr(ENOMEM, is_tx_nobuf); 1933 1934 ((uint16_t *)frm)[0] = 1935 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1936 : htole16(IEEE80211_AUTH_ALG_OPEN); 1937 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1938 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1939 1940 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1941 ((uint16_t *)frm)[3] = 1942 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1943 IEEE80211_ELEMID_CHALLENGE); 1944 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1945 IEEE80211_CHALLENGE_LEN); 1946 m->m_pkthdr.len = m->m_len = 1947 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1948 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1949 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1950 "request encrypt frame (%s)", __func__); 1951 /* mark frame for encryption */ 1952 params.ibp_flags |= IEEE80211_BPF_CRYPTO; 1953 } 1954 } else 1955 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1956 1957 /* XXX not right for shared key */ 1958 if (status == IEEE80211_STATUS_SUCCESS) 1959 IEEE80211_NODE_STAT(ni, tx_auth); 1960 else 1961 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1962 1963 if (vap->iv_opmode == IEEE80211_M_STA) 1964 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1965 (void *) vap->iv_state); 1966 break; 1967 1968 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1969 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 1970 "send station deauthenticate (reason %d)", arg); 1971 m = ieee80211_getmgtframe(&frm, 1972 ic->ic_headroom + sizeof(struct ieee80211_frame), 1973 sizeof(uint16_t)); 1974 if (m == NULL) 1975 senderr(ENOMEM, is_tx_nobuf); 1976 *(uint16_t *)frm = htole16(arg); /* reason */ 1977 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1978 1979 IEEE80211_NODE_STAT(ni, tx_deauth); 1980 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1981 1982 ieee80211_node_unauthorize(ni); /* port closed */ 1983 break; 1984 1985 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1986 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1987 /* 1988 * asreq frame format 1989 * [2] capability information 1990 * [2] listen interval 1991 * [6*] current AP address (reassoc only) 1992 * [tlv] ssid 1993 * [tlv] supported rates 1994 * [tlv] extended supported rates 1995 * [4] power capability (optional) 1996 * [28] supported channels (optional) 1997 * [tlv] HT capabilities 1998 * [tlv] WME (optional) 1999 * [tlv] Vendor OUI HT capabilities (optional) 2000 * [tlv] Atheros capabilities (if negotiated) 2001 * [tlv] AppIE's (optional) 2002 */ 2003 m = ieee80211_getmgtframe(&frm, 2004 ic->ic_headroom + sizeof(struct ieee80211_frame), 2005 sizeof(uint16_t) 2006 + sizeof(uint16_t) 2007 + IEEE80211_ADDR_LEN 2008 + 2 + IEEE80211_NWID_LEN 2009 + 2 + IEEE80211_RATE_SIZE 2010 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2011 + 4 2012 + 2 + 26 2013 + sizeof(struct ieee80211_wme_info) 2014 + sizeof(struct ieee80211_ie_htcap) 2015 + 4 + sizeof(struct ieee80211_ie_htcap) 2016 #ifdef IEEE80211_SUPPORT_SUPERG 2017 + sizeof(struct ieee80211_ath_ie) 2018 #endif 2019 + (vap->iv_appie_wpa != NULL ? 2020 vap->iv_appie_wpa->ie_len : 0) 2021 + (vap->iv_appie_assocreq != NULL ? 2022 vap->iv_appie_assocreq->ie_len : 0) 2023 ); 2024 if (m == NULL) 2025 senderr(ENOMEM, is_tx_nobuf); 2026 2027 KASSERT(vap->iv_opmode == IEEE80211_M_STA, 2028 ("wrong mode %u", vap->iv_opmode)); 2029 capinfo = IEEE80211_CAPINFO_ESS; 2030 if (vap->iv_flags & IEEE80211_F_PRIVACY) 2031 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2032 /* 2033 * NB: Some 11a AP's reject the request when 2034 * short premable is set. 2035 */ 2036 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2037 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2038 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2039 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2040 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2041 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2042 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2043 (vap->iv_flags & IEEE80211_F_DOTH)) 2044 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2045 *(uint16_t *)frm = htole16(capinfo); 2046 frm += 2; 2047 2048 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!")); 2049 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2050 bss->ni_intval)); 2051 frm += 2; 2052 2053 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2054 IEEE80211_ADDR_COPY(frm, bss->ni_bssid); 2055 frm += IEEE80211_ADDR_LEN; 2056 } 2057 2058 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2059 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2060 if (vap->iv_flags & IEEE80211_F_WPA2) { 2061 if (vap->iv_rsn_ie != NULL) 2062 frm = add_ie(frm, vap->iv_rsn_ie); 2063 /* XXX else complain? */ 2064 } 2065 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2066 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) { 2067 frm = ieee80211_add_powercapability(frm, 2068 ic->ic_curchan); 2069 frm = ieee80211_add_supportedchannels(frm, ic); 2070 } 2071 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2072 ni->ni_ies.htcap_ie != NULL && 2073 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2074 frm = ieee80211_add_htcap(frm, ni); 2075 if (vap->iv_flags & IEEE80211_F_WPA1) { 2076 if (vap->iv_wpa_ie != NULL) 2077 frm = add_ie(frm, vap->iv_wpa_ie); 2078 /* XXX else complain */ 2079 } 2080 if ((ic->ic_flags & IEEE80211_F_WME) && 2081 ni->ni_ies.wme_ie != NULL) 2082 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2083 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) && 2084 ni->ni_ies.htcap_ie != NULL && 2085 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2086 frm = ieee80211_add_htcap_vendor(frm, ni); 2087 #ifdef IEEE80211_SUPPORT_SUPERG 2088 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) { 2089 frm = ieee80211_add_ath(frm, 2090 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2091 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2092 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2093 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2094 } 2095 #endif /* IEEE80211_SUPPORT_SUPERG */ 2096 if (vap->iv_appie_assocreq != NULL) 2097 frm = add_appie(frm, vap->iv_appie_assocreq); 2098 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2099 2100 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2101 (void *) vap->iv_state); 2102 break; 2103 2104 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2105 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2106 /* 2107 * asresp frame format 2108 * [2] capability information 2109 * [2] status 2110 * [2] association ID 2111 * [tlv] supported rates 2112 * [tlv] extended supported rates 2113 * [tlv] HT capabilities (standard, if STA enabled) 2114 * [tlv] HT information (standard, if STA enabled) 2115 * [tlv] WME (if configured and STA enabled) 2116 * [tlv] HT capabilities (vendor OUI, if STA enabled) 2117 * [tlv] HT information (vendor OUI, if STA enabled) 2118 * [tlv] Atheros capabilities (if STA enabled) 2119 * [tlv] AppIE's (optional) 2120 */ 2121 m = ieee80211_getmgtframe(&frm, 2122 ic->ic_headroom + sizeof(struct ieee80211_frame), 2123 sizeof(uint16_t) 2124 + sizeof(uint16_t) 2125 + sizeof(uint16_t) 2126 + 2 + IEEE80211_RATE_SIZE 2127 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2128 + sizeof(struct ieee80211_ie_htcap) + 4 2129 + sizeof(struct ieee80211_ie_htinfo) + 4 2130 + sizeof(struct ieee80211_wme_param) 2131 #ifdef IEEE80211_SUPPORT_SUPERG 2132 + sizeof(struct ieee80211_ath_ie) 2133 #endif 2134 + (vap->iv_appie_assocresp != NULL ? 2135 vap->iv_appie_assocresp->ie_len : 0) 2136 ); 2137 if (m == NULL) 2138 senderr(ENOMEM, is_tx_nobuf); 2139 2140 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2141 *(uint16_t *)frm = htole16(capinfo); 2142 frm += 2; 2143 2144 *(uint16_t *)frm = htole16(arg); /* status */ 2145 frm += 2; 2146 2147 if (arg == IEEE80211_STATUS_SUCCESS) { 2148 *(uint16_t *)frm = htole16(ni->ni_associd); 2149 IEEE80211_NODE_STAT(ni, tx_assoc); 2150 } else 2151 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2152 frm += 2; 2153 2154 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2155 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2156 /* NB: respond according to what we received */ 2157 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2158 frm = ieee80211_add_htcap(frm, ni); 2159 frm = ieee80211_add_htinfo(frm, ni); 2160 } 2161 if ((vap->iv_flags & IEEE80211_F_WME) && 2162 ni->ni_ies.wme_ie != NULL) 2163 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2164 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2165 frm = ieee80211_add_htcap_vendor(frm, ni); 2166 frm = ieee80211_add_htinfo_vendor(frm, ni); 2167 } 2168 #ifdef IEEE80211_SUPPORT_SUPERG 2169 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) 2170 frm = ieee80211_add_ath(frm, 2171 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS), 2172 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 2173 ni->ni_authmode != IEEE80211_AUTH_8021X) ? 2174 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 2175 #endif /* IEEE80211_SUPPORT_SUPERG */ 2176 if (vap->iv_appie_assocresp != NULL) 2177 frm = add_appie(frm, vap->iv_appie_assocresp); 2178 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2179 break; 2180 2181 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2182 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 2183 "send station disassociate (reason %d)", arg); 2184 m = ieee80211_getmgtframe(&frm, 2185 ic->ic_headroom + sizeof(struct ieee80211_frame), 2186 sizeof(uint16_t)); 2187 if (m == NULL) 2188 senderr(ENOMEM, is_tx_nobuf); 2189 *(uint16_t *)frm = htole16(arg); /* reason */ 2190 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2191 2192 IEEE80211_NODE_STAT(ni, tx_disassoc); 2193 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2194 break; 2195 2196 default: 2197 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, 2198 "invalid mgmt frame type %u", type); 2199 senderr(EINVAL, is_tx_unknownmgt); 2200 /* NOTREACHED */ 2201 } 2202 2203 /* NB: force non-ProbeResp frames to the highest queue */ 2204 params.ibp_pri = WME_AC_VO; 2205 params.ibp_rate0 = bss->ni_txparms->mgmtrate; 2206 /* NB: we know all frames are unicast */ 2207 params.ibp_try0 = bss->ni_txparms->maxretry; 2208 params.ibp_power = bss->ni_txpower; 2209 return ieee80211_mgmt_output(ni, m, type, ¶ms); 2210 bad: 2211 ieee80211_free_node(ni); 2212 return ret; 2213 #undef senderr 2214 #undef HTFLAGS 2215 } 2216 2217 /* 2218 * Return an mbuf with a probe response frame in it. 2219 * Space is left to prepend and 802.11 header at the 2220 * front but it's left to the caller to fill in. 2221 */ 2222 struct mbuf * 2223 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy) 2224 { 2225 struct ieee80211vap *vap = bss->ni_vap; 2226 struct ieee80211com *ic = bss->ni_ic; 2227 const struct ieee80211_rateset *rs; 2228 struct mbuf *m; 2229 uint16_t capinfo; 2230 uint8_t *frm; 2231 2232 /* 2233 * probe response frame format 2234 * [8] time stamp 2235 * [2] beacon interval 2236 * [2] cabability information 2237 * [tlv] ssid 2238 * [tlv] supported rates 2239 * [tlv] parameter set (FH/DS) 2240 * [tlv] parameter set (IBSS) 2241 * [tlv] country (optional) 2242 * [3] power control (optional) 2243 * [5] channel switch announcement (CSA) (optional) 2244 * [tlv] extended rate phy (ERP) 2245 * [tlv] extended supported rates 2246 * [tlv] RSN (optional) 2247 * [tlv] HT capabilities 2248 * [tlv] HT information 2249 * [tlv] WPA (optional) 2250 * [tlv] WME (optional) 2251 * [tlv] Vendor OUI HT capabilities (optional) 2252 * [tlv] Vendor OUI HT information (optional) 2253 * [tlv] Atheros capabilities 2254 * [tlv] AppIE's (optional) 2255 * [tlv] Mesh ID (MBSS) 2256 * [tlv] Mesh Conf (MBSS) 2257 */ 2258 m = ieee80211_getmgtframe(&frm, 2259 ic->ic_headroom + sizeof(struct ieee80211_frame), 2260 8 2261 + sizeof(uint16_t) 2262 + sizeof(uint16_t) 2263 + 2 + IEEE80211_NWID_LEN 2264 + 2 + IEEE80211_RATE_SIZE 2265 + 7 /* max(7,3) */ 2266 + IEEE80211_COUNTRY_MAX_SIZE 2267 + 3 2268 + sizeof(struct ieee80211_csa_ie) 2269 + 3 2270 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2271 + sizeof(struct ieee80211_ie_wpa) 2272 + sizeof(struct ieee80211_ie_htcap) 2273 + sizeof(struct ieee80211_ie_htinfo) 2274 + sizeof(struct ieee80211_ie_wpa) 2275 + sizeof(struct ieee80211_wme_param) 2276 + 4 + sizeof(struct ieee80211_ie_htcap) 2277 + 4 + sizeof(struct ieee80211_ie_htinfo) 2278 #ifdef IEEE80211_SUPPORT_SUPERG 2279 + sizeof(struct ieee80211_ath_ie) 2280 #endif 2281 #ifdef IEEE80211_SUPPORT_MESH 2282 + 2 + IEEE80211_MESHID_LEN 2283 + sizeof(struct ieee80211_meshconf_ie) 2284 #endif 2285 + (vap->iv_appie_proberesp != NULL ? 2286 vap->iv_appie_proberesp->ie_len : 0) 2287 ); 2288 if (m == NULL) { 2289 vap->iv_stats.is_tx_nobuf++; 2290 return NULL; 2291 } 2292 2293 memset(frm, 0, 8); /* timestamp should be filled later */ 2294 frm += 8; 2295 *(uint16_t *)frm = htole16(bss->ni_intval); 2296 frm += 2; 2297 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan); 2298 *(uint16_t *)frm = htole16(capinfo); 2299 frm += 2; 2300 2301 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen); 2302 rs = ieee80211_get_suprates(ic, bss->ni_chan); 2303 frm = ieee80211_add_rates(frm, rs); 2304 2305 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) { 2306 *frm++ = IEEE80211_ELEMID_FHPARMS; 2307 *frm++ = 5; 2308 *frm++ = bss->ni_fhdwell & 0x00ff; 2309 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff; 2310 *frm++ = IEEE80211_FH_CHANSET( 2311 ieee80211_chan2ieee(ic, bss->ni_chan)); 2312 *frm++ = IEEE80211_FH_CHANPAT( 2313 ieee80211_chan2ieee(ic, bss->ni_chan)); 2314 *frm++ = bss->ni_fhindex; 2315 } else { 2316 *frm++ = IEEE80211_ELEMID_DSPARMS; 2317 *frm++ = 1; 2318 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan); 2319 } 2320 2321 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2322 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2323 *frm++ = 2; 2324 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2325 } 2326 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2327 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2328 frm = ieee80211_add_countryie(frm, ic); 2329 if (vap->iv_flags & IEEE80211_F_DOTH) { 2330 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan)) 2331 frm = ieee80211_add_powerconstraint(frm, vap); 2332 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2333 frm = ieee80211_add_csa(frm, vap); 2334 } 2335 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan)) 2336 frm = ieee80211_add_erp(frm, ic); 2337 frm = ieee80211_add_xrates(frm, rs); 2338 if (vap->iv_flags & IEEE80211_F_WPA2) { 2339 if (vap->iv_rsn_ie != NULL) 2340 frm = add_ie(frm, vap->iv_rsn_ie); 2341 /* XXX else complain? */ 2342 } 2343 /* 2344 * NB: legacy 11b clients do not get certain ie's. 2345 * The caller identifies such clients by passing 2346 * a token in legacy to us. Could expand this to be 2347 * any legacy client for stuff like HT ie's. 2348 */ 2349 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2350 legacy != IEEE80211_SEND_LEGACY_11B) { 2351 frm = ieee80211_add_htcap(frm, bss); 2352 frm = ieee80211_add_htinfo(frm, bss); 2353 } 2354 if (vap->iv_flags & IEEE80211_F_WPA1) { 2355 if (vap->iv_wpa_ie != NULL) 2356 frm = add_ie(frm, vap->iv_wpa_ie); 2357 /* XXX else complain? */ 2358 } 2359 if (vap->iv_flags & IEEE80211_F_WME) 2360 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2361 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) && 2362 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) && 2363 legacy != IEEE80211_SEND_LEGACY_11B) { 2364 frm = ieee80211_add_htcap_vendor(frm, bss); 2365 frm = ieee80211_add_htinfo_vendor(frm, bss); 2366 } 2367 #ifdef IEEE80211_SUPPORT_SUPERG 2368 if ((vap->iv_flags & IEEE80211_F_ATHEROS) && 2369 legacy != IEEE80211_SEND_LEGACY_11B) 2370 frm = ieee80211_add_athcaps(frm, bss); 2371 #endif 2372 if (vap->iv_appie_proberesp != NULL) 2373 frm = add_appie(frm, vap->iv_appie_proberesp); 2374 #ifdef IEEE80211_SUPPORT_MESH 2375 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2376 frm = ieee80211_add_meshid(frm, vap); 2377 frm = ieee80211_add_meshconf(frm, vap); 2378 } 2379 #endif 2380 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2381 2382 return m; 2383 } 2384 2385 /* 2386 * Send a probe response frame to the specified mac address. 2387 * This does not go through the normal mgt frame api so we 2388 * can specify the destination address and re-use the bss node 2389 * for the sta reference. 2390 */ 2391 int 2392 ieee80211_send_proberesp(struct ieee80211vap *vap, 2393 const uint8_t da[IEEE80211_ADDR_LEN], int legacy) 2394 { 2395 struct ieee80211_node *bss = vap->iv_bss; 2396 struct ieee80211com *ic = vap->iv_ic; 2397 struct mbuf *m; 2398 #ifdef IEEE80211_DEBUG 2399 char ethstr[ETHER_ADDRSTRLEN + 1]; 2400 #endif 2401 2402 if (vap->iv_state == IEEE80211_S_CAC) { 2403 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss, 2404 "block %s frame in CAC state", "probe response"); 2405 vap->iv_stats.is_tx_badstate++; 2406 return EIO; /* XXX */ 2407 } 2408 2409 /* 2410 * Hold a reference on the node so it doesn't go away until after 2411 * the xmit is complete all the way in the driver. On error we 2412 * will remove our reference. 2413 */ 2414 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE, 2415 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 2416 __func__, __LINE__, bss, kether_ntoa(bss->ni_macaddr, ethstr), 2417 ieee80211_node_refcnt(bss)+1); 2418 ieee80211_ref_node(bss); 2419 2420 m = ieee80211_alloc_proberesp(bss, legacy); 2421 if (m == NULL) { 2422 ieee80211_free_node(bss); 2423 return ENOMEM; 2424 } 2425 2426 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2427 KASSERT(m != NULL, ("no room for header")); 2428 2429 ieee80211_send_setup(bss, m, 2430 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 2431 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid); 2432 /* XXX power management? */ 2433 m->m_flags |= M_ENCAP; /* mark encapsulated */ 2434 2435 M_WME_SETAC(m, WME_AC_BE); 2436 2437 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 2438 "send probe resp on channel %u to %s%s\n", 2439 ieee80211_chan2ieee(ic, ic->ic_curchan), kether_ntoa(da, ethstr), 2440 legacy ? " <legacy>" : ""); 2441 IEEE80211_NODE_STAT(bss, tx_mgmt); 2442 2443 return ic->ic_raw_xmit(bss, m, NULL); 2444 } 2445 2446 /* 2447 * Allocate and build a RTS (Request To Send) control frame. 2448 */ 2449 struct mbuf * 2450 ieee80211_alloc_rts(struct ieee80211com *ic, 2451 const uint8_t ra[IEEE80211_ADDR_LEN], 2452 const uint8_t ta[IEEE80211_ADDR_LEN], 2453 uint16_t dur) 2454 { 2455 struct ieee80211_frame_rts *rts; 2456 struct mbuf *m; 2457 2458 /* XXX honor ic_headroom */ 2459 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2460 if (m != NULL) { 2461 rts = mtod(m, struct ieee80211_frame_rts *); 2462 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2463 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS; 2464 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2465 *(u_int16_t *)rts->i_dur = htole16(dur); 2466 IEEE80211_ADDR_COPY(rts->i_ra, ra); 2467 IEEE80211_ADDR_COPY(rts->i_ta, ta); 2468 2469 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts); 2470 } 2471 return m; 2472 } 2473 2474 /* 2475 * Allocate and build a CTS (Clear To Send) control frame. 2476 */ 2477 struct mbuf * 2478 ieee80211_alloc_cts(struct ieee80211com *ic, 2479 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur) 2480 { 2481 struct ieee80211_frame_cts *cts; 2482 struct mbuf *m; 2483 2484 /* XXX honor ic_headroom */ 2485 m = m_gethdr(MB_DONTWAIT, MT_DATA); 2486 if (m != NULL) { 2487 cts = mtod(m, struct ieee80211_frame_cts *); 2488 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 | 2489 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS; 2490 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2491 *(u_int16_t *)cts->i_dur = htole16(dur); 2492 IEEE80211_ADDR_COPY(cts->i_ra, ra); 2493 2494 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts); 2495 } 2496 return m; 2497 } 2498 2499 static void 2500 ieee80211_tx_mgt_timeout_callout(void *arg) 2501 { 2502 struct ieee80211_node *ni = arg; 2503 struct ieee80211vap *vap; 2504 2505 wlan_serialize_enter(); 2506 vap = ni->ni_vap; 2507 if (vap->iv_state != IEEE80211_S_INIT && 2508 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2509 /* 2510 * NB: it's safe to specify a timeout as the reason here; 2511 * it'll only be used in the right state. 2512 */ 2513 ieee80211_new_state(vap, IEEE80211_S_SCAN, 2514 IEEE80211_SCAN_FAIL_TIMEOUT); 2515 } 2516 wlan_serialize_exit(); 2517 } 2518 2519 static void 2520 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2521 { 2522 struct ieee80211vap *vap = ni->ni_vap; 2523 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2524 2525 /* 2526 * Frame transmit completed; arrange timer callback. If 2527 * transmit was successfuly we wait for response. Otherwise 2528 * we arrange an immediate callback instead of doing the 2529 * callback directly since we don't know what state the driver 2530 * is in (e.g. what locks it is holding). This work should 2531 * not be too time-critical and not happen too often so the 2532 * added overhead is acceptable. 2533 * 2534 * XXX what happens if !acked but response shows up before callback? 2535 */ 2536 if (vap->iv_state == ostate) 2537 callout_reset(&vap->iv_mgtsend, 2538 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2539 ieee80211_tx_mgt_timeout_callout, ni); 2540 } 2541 2542 static void 2543 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm, 2544 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni) 2545 { 2546 struct ieee80211vap *vap = ni->ni_vap; 2547 struct ieee80211com *ic = ni->ni_ic; 2548 struct ieee80211_rateset *rs = &ni->ni_rates; 2549 uint16_t capinfo; 2550 2551 /* 2552 * beacon frame format 2553 * [8] time stamp 2554 * [2] beacon interval 2555 * [2] cabability information 2556 * [tlv] ssid 2557 * [tlv] supported rates 2558 * [3] parameter set (DS) 2559 * [8] CF parameter set (optional) 2560 * [tlv] parameter set (IBSS/TIM) 2561 * [tlv] country (optional) 2562 * [3] power control (optional) 2563 * [5] channel switch announcement (CSA) (optional) 2564 * [tlv] extended rate phy (ERP) 2565 * [tlv] extended supported rates 2566 * [tlv] RSN parameters 2567 * [tlv] HT capabilities 2568 * [tlv] HT information 2569 * XXX Vendor-specific OIDs (e.g. Atheros) 2570 * [tlv] WPA parameters 2571 * [tlv] WME parameters 2572 * [tlv] Vendor OUI HT capabilities (optional) 2573 * [tlv] Vendor OUI HT information (optional) 2574 * [tlv] Atheros capabilities (optional) 2575 * [tlv] TDMA parameters (optional) 2576 * [tlv] Mesh ID (MBSS) 2577 * [tlv] Mesh Conf (MBSS) 2578 * [tlv] application data (optional) 2579 */ 2580 2581 memset(bo, 0, sizeof(*bo)); 2582 2583 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2584 frm += 8; 2585 *(uint16_t *)frm = htole16(ni->ni_intval); 2586 frm += 2; 2587 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2588 bo->bo_caps = (uint16_t *)frm; 2589 *(uint16_t *)frm = htole16(capinfo); 2590 frm += 2; 2591 *frm++ = IEEE80211_ELEMID_SSID; 2592 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) { 2593 *frm++ = ni->ni_esslen; 2594 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2595 frm += ni->ni_esslen; 2596 } else 2597 *frm++ = 0; 2598 frm = ieee80211_add_rates(frm, rs); 2599 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) { 2600 *frm++ = IEEE80211_ELEMID_DSPARMS; 2601 *frm++ = 1; 2602 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan); 2603 } 2604 if (ic->ic_flags & IEEE80211_F_PCF) { 2605 bo->bo_cfp = frm; 2606 frm = ieee80211_add_cfparms(frm, ic); 2607 } 2608 bo->bo_tim = frm; 2609 if (vap->iv_opmode == IEEE80211_M_IBSS) { 2610 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2611 *frm++ = 2; 2612 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2613 bo->bo_tim_len = 0; 2614 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2615 vap->iv_opmode == IEEE80211_M_MBSS) { 2616 /* TIM IE is the same for Mesh and Hostap */ 2617 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2618 2619 tie->tim_ie = IEEE80211_ELEMID_TIM; 2620 tie->tim_len = 4; /* length */ 2621 tie->tim_count = 0; /* DTIM count */ 2622 tie->tim_period = vap->iv_dtim_period; /* DTIM period */ 2623 tie->tim_bitctl = 0; /* bitmap control */ 2624 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2625 frm += sizeof(struct ieee80211_tim_ie); 2626 bo->bo_tim_len = 1; 2627 } 2628 bo->bo_tim_trailer = frm; 2629 if ((vap->iv_flags & IEEE80211_F_DOTH) || 2630 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD)) 2631 frm = ieee80211_add_countryie(frm, ic); 2632 if (vap->iv_flags & IEEE80211_F_DOTH) { 2633 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan)) 2634 frm = ieee80211_add_powerconstraint(frm, vap); 2635 bo->bo_csa = frm; 2636 if (ic->ic_flags & IEEE80211_F_CSAPENDING) 2637 frm = ieee80211_add_csa(frm, vap); 2638 } else 2639 bo->bo_csa = frm; 2640 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) { 2641 bo->bo_erp = frm; 2642 frm = ieee80211_add_erp(frm, ic); 2643 } 2644 frm = ieee80211_add_xrates(frm, rs); 2645 if (vap->iv_flags & IEEE80211_F_WPA2) { 2646 if (vap->iv_rsn_ie != NULL) 2647 frm = add_ie(frm, vap->iv_rsn_ie); 2648 /* XXX else complain */ 2649 } 2650 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) { 2651 frm = ieee80211_add_htcap(frm, ni); 2652 bo->bo_htinfo = frm; 2653 frm = ieee80211_add_htinfo(frm, ni); 2654 } 2655 if (vap->iv_flags & IEEE80211_F_WPA1) { 2656 if (vap->iv_wpa_ie != NULL) 2657 frm = add_ie(frm, vap->iv_wpa_ie); 2658 /* XXX else complain */ 2659 } 2660 if (vap->iv_flags & IEEE80211_F_WME) { 2661 bo->bo_wme = frm; 2662 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2663 } 2664 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && 2665 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) { 2666 frm = ieee80211_add_htcap_vendor(frm, ni); 2667 frm = ieee80211_add_htinfo_vendor(frm, ni); 2668 } 2669 #ifdef IEEE80211_SUPPORT_SUPERG 2670 if (vap->iv_flags & IEEE80211_F_ATHEROS) { 2671 bo->bo_ath = frm; 2672 frm = ieee80211_add_athcaps(frm, ni); 2673 } 2674 #endif 2675 #ifdef IEEE80211_SUPPORT_TDMA 2676 if (vap->iv_caps & IEEE80211_C_TDMA) { 2677 bo->bo_tdma = frm; 2678 frm = ieee80211_add_tdma(frm, vap); 2679 } 2680 #endif 2681 if (vap->iv_appie_beacon != NULL) { 2682 bo->bo_appie = frm; 2683 bo->bo_appie_len = vap->iv_appie_beacon->ie_len; 2684 frm = add_appie(frm, vap->iv_appie_beacon); 2685 } 2686 #ifdef IEEE80211_SUPPORT_MESH 2687 if (vap->iv_opmode == IEEE80211_M_MBSS) { 2688 frm = ieee80211_add_meshid(frm, vap); 2689 bo->bo_meshconf = frm; 2690 frm = ieee80211_add_meshconf(frm, vap); 2691 } 2692 #endif 2693 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2694 bo->bo_csa_trailer_len = frm - bo->bo_csa; 2695 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2696 } 2697 2698 /* 2699 * Allocate a beacon frame and fillin the appropriate bits. 2700 */ 2701 struct mbuf * 2702 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2703 struct ieee80211_beacon_offsets *bo) 2704 { 2705 struct ieee80211vap *vap = ni->ni_vap; 2706 struct ieee80211com *ic = ni->ni_ic; 2707 struct ifnet *ifp = vap->iv_ifp; 2708 struct ieee80211_frame *wh; 2709 struct mbuf *m; 2710 int pktlen; 2711 uint8_t *frm; 2712 2713 /* 2714 * beacon frame format 2715 * [8] time stamp 2716 * [2] beacon interval 2717 * [2] cabability information 2718 * [tlv] ssid 2719 * [tlv] supported rates 2720 * [3] parameter set (DS) 2721 * [8] CF parameter set (optional) 2722 * [tlv] parameter set (IBSS/TIM) 2723 * [tlv] country (optional) 2724 * [3] power control (optional) 2725 * [5] channel switch announcement (CSA) (optional) 2726 * [tlv] extended rate phy (ERP) 2727 * [tlv] extended supported rates 2728 * [tlv] RSN parameters 2729 * [tlv] HT capabilities 2730 * [tlv] HT information 2731 * [tlv] Vendor OUI HT capabilities (optional) 2732 * [tlv] Vendor OUI HT information (optional) 2733 * XXX Vendor-specific OIDs (e.g. Atheros) 2734 * [tlv] WPA parameters 2735 * [tlv] WME parameters 2736 * [tlv] TDMA parameters (optional) 2737 * [tlv] Mesh ID (MBSS) 2738 * [tlv] Mesh Conf (MBSS) 2739 * [tlv] application data (optional) 2740 * NB: we allocate the max space required for the TIM bitmap. 2741 * XXX how big is this? 2742 */ 2743 pktlen = 8 /* time stamp */ 2744 + sizeof(uint16_t) /* beacon interval */ 2745 + sizeof(uint16_t) /* capabilities */ 2746 + 2 + ni->ni_esslen /* ssid */ 2747 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2748 + 2 + 1 /* DS parameters */ 2749 + 2 + 6 /* CF parameters */ 2750 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */ 2751 + IEEE80211_COUNTRY_MAX_SIZE /* country */ 2752 + 2 + 1 /* power control */ 2753 + sizeof(struct ieee80211_csa_ie) /* CSA */ 2754 + 2 + 1 /* ERP */ 2755 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2756 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2757 2*sizeof(struct ieee80211_ie_wpa) : 0) 2758 /* XXX conditional? */ 2759 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2760 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2761 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */ 2762 sizeof(struct ieee80211_wme_param) : 0) 2763 #ifdef IEEE80211_SUPPORT_SUPERG 2764 + sizeof(struct ieee80211_ath_ie) /* ATH */ 2765 #endif 2766 #ifdef IEEE80211_SUPPORT_TDMA 2767 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */ 2768 sizeof(struct ieee80211_tdma_param) : 0) 2769 #endif 2770 #ifdef IEEE80211_SUPPORT_MESH 2771 + 2 + ni->ni_meshidlen 2772 + sizeof(struct ieee80211_meshconf_ie) 2773 #endif 2774 + IEEE80211_MAX_APPIE 2775 ; 2776 m = ieee80211_getmgtframe(&frm, 2777 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2778 if (m == NULL) { 2779 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY, 2780 "%s: cannot get buf; size %u\n", __func__, pktlen); 2781 vap->iv_stats.is_tx_nobuf++; 2782 return NULL; 2783 } 2784 ieee80211_beacon_construct(m, frm, bo, ni); 2785 2786 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT); 2787 KASSERT(m != NULL, ("no space for 802.11 header?")); 2788 wh = mtod(m, struct ieee80211_frame *); 2789 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2790 IEEE80211_FC0_SUBTYPE_BEACON; 2791 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2792 *(uint16_t *)wh->i_dur = 0; 2793 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2794 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr); 2795 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2796 *(uint16_t *)wh->i_seq = 0; 2797 2798 return m; 2799 } 2800 2801 /* 2802 * Update the dynamic parts of a beacon frame based on the current state. 2803 */ 2804 int 2805 ieee80211_beacon_update(struct ieee80211_node *ni, 2806 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2807 { 2808 struct ieee80211vap *vap = ni->ni_vap; 2809 struct ieee80211com *ic = ni->ni_ic; 2810 int len_changed = 0; 2811 uint16_t capinfo; 2812 2813 /* 2814 * Handle 11h channel change when we've reached the count. 2815 * We must recalculate the beacon frame contents to account 2816 * for the new channel. Note we do this only for the first 2817 * vap that reaches this point; subsequent vaps just update 2818 * their beacon state to reflect the recalculated channel. 2819 */ 2820 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) && 2821 vap->iv_csa_count == ic->ic_csa_count) { 2822 vap->iv_csa_count = 0; 2823 /* 2824 * Effect channel change before reconstructing the beacon 2825 * frame contents as many places reference ni_chan. 2826 */ 2827 if (ic->ic_csa_newchan != NULL) 2828 ieee80211_csa_completeswitch(ic); 2829 /* 2830 * NB: ieee80211_beacon_construct clears all pending 2831 * updates in bo_flags so we don't need to explicitly 2832 * clear IEEE80211_BEACON_CSA. 2833 */ 2834 ieee80211_beacon_construct(m, 2835 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni); 2836 2837 /* XXX do WME aggressive mode processing? */ 2838 return 1; /* just assume length changed */ 2839 } 2840 2841 /* XXX faster to recalculate entirely or just changes? */ 2842 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan); 2843 *bo->bo_caps = htole16(capinfo); 2844 2845 if (vap->iv_flags & IEEE80211_F_WME) { 2846 struct ieee80211_wme_state *wme = &ic->ic_wme; 2847 2848 /* 2849 * Check for agressive mode change. When there is 2850 * significant high priority traffic in the BSS 2851 * throttle back BE traffic by using conservative 2852 * parameters. Otherwise BE uses agressive params 2853 * to optimize performance of legacy/non-QoS traffic. 2854 */ 2855 if (wme->wme_flags & WME_F_AGGRMODE) { 2856 if (wme->wme_hipri_traffic > 2857 wme->wme_hipri_switch_thresh) { 2858 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2859 "%s: traffic %u, disable aggressive mode\n", 2860 __func__, wme->wme_hipri_traffic); 2861 wme->wme_flags &= ~WME_F_AGGRMODE; 2862 ieee80211_wme_updateparams_locked(vap); 2863 wme->wme_hipri_traffic = 2864 wme->wme_hipri_switch_hysteresis; 2865 } else 2866 wme->wme_hipri_traffic = 0; 2867 } else { 2868 if (wme->wme_hipri_traffic <= 2869 wme->wme_hipri_switch_thresh) { 2870 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME, 2871 "%s: traffic %u, enable aggressive mode\n", 2872 __func__, wme->wme_hipri_traffic); 2873 wme->wme_flags |= WME_F_AGGRMODE; 2874 ieee80211_wme_updateparams_locked(vap); 2875 wme->wme_hipri_traffic = 0; 2876 } else 2877 wme->wme_hipri_traffic = 2878 wme->wme_hipri_switch_hysteresis; 2879 } 2880 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2881 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2882 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2883 } 2884 } 2885 2886 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2887 ieee80211_ht_update_beacon(vap, bo); 2888 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2889 } 2890 #ifdef IEEE80211_SUPPORT_TDMA 2891 if (vap->iv_caps & IEEE80211_C_TDMA) { 2892 /* 2893 * NB: the beacon is potentially updated every TBTT. 2894 */ 2895 ieee80211_tdma_update_beacon(vap, bo); 2896 } 2897 #endif 2898 #ifdef IEEE80211_SUPPORT_MESH 2899 if (vap->iv_opmode == IEEE80211_M_MBSS) 2900 ieee80211_mesh_update_beacon(vap, bo); 2901 #endif 2902 2903 if (vap->iv_opmode == IEEE80211_M_HOSTAP || 2904 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/ 2905 struct ieee80211_tim_ie *tie = 2906 (struct ieee80211_tim_ie *) bo->bo_tim; 2907 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2908 u_int timlen, timoff, i; 2909 /* 2910 * ATIM/DTIM needs updating. If it fits in the 2911 * current space allocated then just copy in the 2912 * new bits. Otherwise we need to move any trailing 2913 * data to make room. Note that we know there is 2914 * contiguous space because ieee80211_beacon_allocate 2915 * insures there is space in the mbuf to write a 2916 * maximal-size virtual bitmap (based on iv_max_aid). 2917 */ 2918 /* 2919 * Calculate the bitmap size and offset, copy any 2920 * trailer out of the way, and then copy in the 2921 * new bitmap and update the information element. 2922 * Note that the tim bitmap must contain at least 2923 * one byte and any offset must be even. 2924 */ 2925 if (vap->iv_ps_pending != 0) { 2926 timoff = 128; /* impossibly large */ 2927 for (i = 0; i < vap->iv_tim_len; i++) 2928 if (vap->iv_tim_bitmap[i]) { 2929 timoff = i &~ 1; 2930 break; 2931 } 2932 KASSERT(timoff != 128, ("tim bitmap empty!")); 2933 for (i = vap->iv_tim_len-1; i >= timoff; i--) 2934 if (vap->iv_tim_bitmap[i]) 2935 break; 2936 timlen = 1 + (i - timoff); 2937 } else { 2938 timoff = 0; 2939 timlen = 1; 2940 } 2941 if (timlen != bo->bo_tim_len) { 2942 /* copy up/down trailer */ 2943 int adjust = tie->tim_bitmap+timlen 2944 - bo->bo_tim_trailer; 2945 ovbcopy(bo->bo_tim_trailer, 2946 bo->bo_tim_trailer+adjust, 2947 bo->bo_tim_trailer_len); 2948 bo->bo_tim_trailer += adjust; 2949 bo->bo_erp += adjust; 2950 bo->bo_htinfo += adjust; 2951 #ifdef IEEE80211_SUPERG_SUPPORT 2952 bo->bo_ath += adjust; 2953 #endif 2954 #ifdef IEEE80211_TDMA_SUPPORT 2955 bo->bo_tdma += adjust; 2956 #endif 2957 #ifdef IEEE80211_MESH_SUPPORT 2958 bo->bo_meshconf += adjust; 2959 #endif 2960 bo->bo_appie += adjust; 2961 bo->bo_wme += adjust; 2962 bo->bo_csa += adjust; 2963 bo->bo_tim_len = timlen; 2964 2965 /* update information element */ 2966 tie->tim_len = 3 + timlen; 2967 tie->tim_bitctl = timoff; 2968 len_changed = 1; 2969 } 2970 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff, 2971 bo->bo_tim_len); 2972 2973 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2974 2975 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER, 2976 "%s: TIM updated, pending %u, off %u, len %u\n", 2977 __func__, vap->iv_ps_pending, timoff, timlen); 2978 } 2979 /* count down DTIM period */ 2980 if (tie->tim_count == 0) 2981 tie->tim_count = tie->tim_period - 1; 2982 else 2983 tie->tim_count--; 2984 /* update state for buffered multicast frames on DTIM */ 2985 if (mcast && tie->tim_count == 0) 2986 tie->tim_bitctl |= 1; 2987 else 2988 tie->tim_bitctl &= ~1; 2989 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) { 2990 struct ieee80211_csa_ie *csa = 2991 (struct ieee80211_csa_ie *) bo->bo_csa; 2992 2993 /* 2994 * Insert or update CSA ie. If we're just starting 2995 * to count down to the channel switch then we need 2996 * to insert the CSA ie. Otherwise we just need to 2997 * drop the count. The actual change happens above 2998 * when the vap's count reaches the target count. 2999 */ 3000 if (vap->iv_csa_count == 0) { 3001 memmove(&csa[1], csa, bo->bo_csa_trailer_len); 3002 bo->bo_erp += sizeof(*csa); 3003 bo->bo_htinfo += sizeof(*csa); 3004 bo->bo_wme += sizeof(*csa); 3005 #ifdef IEEE80211_SUPERG_SUPPORT 3006 bo->bo_ath += sizeof(*csa); 3007 #endif 3008 #ifdef IEEE80211_TDMA_SUPPORT 3009 bo->bo_tdma += sizeof(*csa); 3010 #endif 3011 #ifdef IEEE80211_MESH_SUPPORT 3012 bo->bo_meshconf += sizeof(*csa); 3013 #endif 3014 bo->bo_appie += sizeof(*csa); 3015 bo->bo_csa_trailer_len += sizeof(*csa); 3016 bo->bo_tim_trailer_len += sizeof(*csa); 3017 m->m_len += sizeof(*csa); 3018 m->m_pkthdr.len += sizeof(*csa); 3019 3020 ieee80211_add_csa(bo->bo_csa, vap); 3021 } else 3022 csa->csa_count--; 3023 vap->iv_csa_count++; 3024 /* NB: don't clear IEEE80211_BEACON_CSA */ 3025 } 3026 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 3027 /* 3028 * ERP element needs updating. 3029 */ 3030 (void) ieee80211_add_erp(bo->bo_erp, ic); 3031 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 3032 } 3033 #ifdef IEEE80211_SUPPORT_SUPERG 3034 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) { 3035 ieee80211_add_athcaps(bo->bo_ath, ni); 3036 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH); 3037 } 3038 #endif 3039 } 3040 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) { 3041 const struct ieee80211_appie *aie = vap->iv_appie_beacon; 3042 int aielen; 3043 uint8_t *frm; 3044 3045 aielen = 0; 3046 if (aie != NULL) 3047 aielen += aie->ie_len; 3048 if (aielen != bo->bo_appie_len) { 3049 /* copy up/down trailer */ 3050 int adjust = aielen - bo->bo_appie_len; 3051 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust, 3052 bo->bo_tim_trailer_len); 3053 bo->bo_tim_trailer += adjust; 3054 bo->bo_appie += adjust; 3055 bo->bo_appie_len = aielen; 3056 3057 len_changed = 1; 3058 } 3059 frm = bo->bo_appie; 3060 if (aie != NULL) 3061 frm = add_appie(frm, aie); 3062 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE); 3063 } 3064 3065 return len_changed; 3066 } 3067