1 /*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD: head/sys/net80211/ieee80211_wds.c 203422 2010-02-03 10:07:43Z rpaulo $ 26 * $DragonFly$ 27 */ 28 29 /* 30 * IEEE 802.11 WDS mode support. 31 */ 32 #include "opt_inet.h" 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 #include <net/route.h> 53 54 #include <net/bpf.h> 55 56 #include <netproto/802_11/ieee80211_var.h> 57 #include <netproto/802_11/ieee80211_wds.h> 58 #include <netproto/802_11/ieee80211_input.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <netproto/802_11/ieee80211_superg.h> 61 #endif 62 63 static void wds_vattach(struct ieee80211vap *); 64 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 65 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int); 66 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 67 int subtype, int, int); 68 69 void 70 ieee80211_wds_attach(struct ieee80211com *ic) 71 { 72 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 73 } 74 75 void 76 ieee80211_wds_detach(struct ieee80211com *ic) 77 { 78 } 79 80 static void 81 wds_vdetach(struct ieee80211vap *vap) 82 { 83 if (vap->iv_bss != NULL) { 84 /* XXX locking? */ 85 if (vap->iv_bss->ni_wdsvap == vap) 86 vap->iv_bss->ni_wdsvap = NULL; 87 } 88 } 89 90 static void 91 wds_vattach(struct ieee80211vap *vap) 92 { 93 vap->iv_newstate = wds_newstate; 94 vap->iv_input = wds_input; 95 vap->iv_recv_mgmt = wds_recv_mgmt; 96 vap->iv_opdetach = wds_vdetach; 97 } 98 99 static void 100 wds_flush(struct ieee80211_node *ni) 101 { 102 struct ieee80211com *ic = ni->ni_ic; 103 struct mbuf *m, *next; 104 int8_t rssi, nf; 105 106 m = ieee80211_ageq_remove(&ic->ic_stageq, 107 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 108 if (m == NULL) 109 return; 110 111 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 112 "%s", "flush wds queue"); 113 ic->ic_node_getsignal(ni, &rssi, &nf); 114 for (; m != NULL; m = next) { 115 next = m->m_nextpkt; 116 m->m_nextpkt = NULL; 117 ieee80211_input(ni, m, rssi, nf); 118 } 119 } 120 121 static int 122 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 123 { 124 struct ieee80211com *ic = vap->iv_ic; 125 /* struct ieee80211_node_table *nt = &ic->ic_sta;*/ 126 struct ieee80211_node *ni, *obss; 127 128 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 129 "%s: creating link to %6D on channel %u\n", __func__, 130 vap->iv_des_bssid, ":", ieee80211_chan2ieee(ic, chan)); 131 132 /* NB: vap create must specify the bssid for the link */ 133 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 134 /* NB: we should only be called on RUN transition */ 135 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 136 137 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 138 /* 139 * Dynamic/non-legacy WDS. Reference the associated 140 * station specified by the desired bssid setup at vap 141 * create. Point ni_wdsvap at the WDS vap so 4-address 142 * frames received through the associated AP vap will 143 * be dispatched upward (e.g. to a bridge) as though 144 * they arrived on the WDS vap. 145 */ 146 obss = NULL; 147 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 148 if (ni == NULL) { 149 /* 150 * Node went away before we could hookup. This 151 * should be ok; no traffic will flow and a leave 152 * event will be dispatched that should cause 153 * the vap to be destroyed. 154 */ 155 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 156 "%s: station %6D went away\n", 157 __func__, vap->iv_des_bssid, ":"); 158 /* XXX stat? */ 159 } else if (ni->ni_wdsvap != NULL) { 160 /* 161 * Node already setup with a WDS vap; we cannot 162 * allow multiple references so disallow. If 163 * ni_wdsvap points at us that's ok; we should 164 * do nothing anyway. 165 */ 166 /* XXX printf instead? */ 167 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 168 "%s: station %6D in use with %s\n", 169 __func__, vap->iv_des_bssid, ":", 170 ni->ni_wdsvap->iv_ifp->if_xname); 171 /* XXX stat? */ 172 } else { 173 /* 174 * Committed to new node, setup state. 175 */ 176 obss = vap->iv_bss; 177 vap->iv_bss = ni; 178 ni->ni_wdsvap = vap; 179 } 180 if (obss != NULL) { 181 /* NB: deferred to avoid recursive lock */ 182 ieee80211_free_node(obss); 183 } 184 } else { 185 /* 186 * Legacy WDS vap setup. 187 */ 188 /* 189 * The far end does not associate so we just create 190 * create a new node and install it as the vap's 191 * bss node. We must simulate an association and 192 * authorize the port for traffic to flow. 193 * XXX check if node already in sta table? 194 */ 195 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 196 if (ni != NULL) { 197 obss = vap->iv_bss; 198 vap->iv_bss = ieee80211_ref_node(ni); 199 ni->ni_flags |= IEEE80211_NODE_AREF; 200 if (obss != NULL) 201 ieee80211_free_node(obss); 202 /* give driver a chance to setup state like ni_txrate */ 203 if (ic->ic_newassoc != NULL) 204 ic->ic_newassoc(ni, 1); 205 /* tell the authenticator about new station */ 206 if (vap->iv_auth->ia_node_join != NULL) 207 vap->iv_auth->ia_node_join(ni); 208 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 209 ieee80211_node_authorize(ni); 210 211 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 212 /* XXX inject l2uf frame */ 213 } 214 } 215 216 /* 217 * Flush any pending frames now that were setup. 218 */ 219 if (ni != NULL) 220 wds_flush(ni); 221 return (ni == NULL ? ENOENT : 0); 222 } 223 224 /* 225 * Propagate multicast frames of an ap vap to all DWDS links. 226 * The caller is assumed to have verified this frame is multicast. 227 */ 228 void 229 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 230 { 231 struct ieee80211com *ic = vap0->iv_ic; 232 struct ifnet *parent = ic->ic_ifp; 233 const struct ether_header *eh = mtod(m, const struct ether_header *); 234 struct ieee80211_node *ni; 235 struct ieee80211vap *vap; 236 struct ifnet *ifp; 237 struct mbuf *mcopy; 238 int err; 239 240 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 241 ("%6D not mcast", eh->ether_dhost, ":")); 242 243 /* XXX locking */ 244 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 245 /* only DWDS vaps are interesting */ 246 if (vap->iv_opmode != IEEE80211_M_WDS || 247 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 248 continue; 249 /* if it came in this interface, don't send it back out */ 250 ifp = vap->iv_ifp; 251 if (ifp == m->m_pkthdr.rcvif) 252 continue; 253 /* 254 * Duplicate the frame and send it. 255 */ 256 mcopy = m_copypacket(m, MB_DONTWAIT); 257 if (mcopy == NULL) { 258 ifp->if_oerrors++; 259 /* XXX stat + msg */ 260 continue; 261 } 262 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 263 if (ni == NULL) { 264 /* NB: ieee80211_find_txnode does stat+msg */ 265 ifp->if_oerrors++; 266 m_freem(mcopy); 267 continue; 268 } 269 /* calculate priority so drivers can find the tx queue */ 270 if (ieee80211_classify(ni, mcopy)) { 271 IEEE80211_DISCARD_MAC(vap, 272 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 273 eh->ether_dhost, NULL, 274 "%s", "classification failure"); 275 vap->iv_stats.is_tx_classify++; 276 ifp->if_oerrors++; 277 m_freem(mcopy); 278 ieee80211_free_node(ni); 279 continue; 280 } 281 282 BPF_MTAP(ifp, m); /* 802.3 tx */ 283 284 /* 285 * Encapsulate the packet in prep for transmission. 286 */ 287 mcopy = ieee80211_encap(vap, ni, mcopy); 288 if (mcopy == NULL) { 289 /* NB: stat+msg handled in ieee80211_encap */ 290 ieee80211_free_node(ni); 291 continue; 292 } 293 mcopy->m_flags |= M_MCAST; 294 mcopy->m_pkthdr.rcvif = (void *) ni; 295 296 err = ieee80211_handoff(parent, mcopy); 297 if (err) { 298 /* NB: IFQ_HANDOFF reclaims mbuf */ 299 ifp->if_oerrors++; 300 ieee80211_free_node(ni); 301 } else 302 ifp->if_opackets++; 303 } 304 } 305 306 /* 307 * Handle DWDS discovery on receipt of a 4-address frame in 308 * ap mode. Queue the frame and post an event for someone 309 * to plumb the necessary WDS vap for this station. Frames 310 * received prior to the vap set running will then be reprocessed 311 * as if they were just received. 312 */ 313 void 314 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 315 { 316 struct ieee80211com *ic = ni->ni_ic; 317 318 /* 319 * Save the frame with an aging interval 4 times 320 * the listen interval specified by the station. 321 * Frames that sit around too long are reclaimed 322 * using this information. 323 * XXX handle overflow? 324 * XXX per/vap beacon interval? 325 */ 326 m->m_pkthdr.rcvif = (void *)(uintptr_t) 327 ieee80211_mac_hash(ic, ni->ni_macaddr); 328 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 329 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 330 ieee80211_notify_wds_discover(ni); 331 } 332 333 /* 334 * IEEE80211_M_WDS vap state machine handler. 335 */ 336 static int 337 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 338 { 339 struct ieee80211com *ic = vap->iv_ic; 340 struct ieee80211_node *ni; 341 enum ieee80211_state ostate; 342 int error; 343 344 ostate = vap->iv_state; 345 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 346 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 347 vap->iv_state = nstate; /* state transition */ 348 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 349 if (ostate != IEEE80211_S_SCAN) 350 ieee80211_cancel_scan(vap); /* background scan */ 351 ni = vap->iv_bss; /* NB: no reference held */ 352 error = 0; 353 switch (nstate) { 354 case IEEE80211_S_INIT: 355 switch (ostate) { 356 case IEEE80211_S_SCAN: 357 ieee80211_cancel_scan(vap); 358 break; 359 default: 360 break; 361 } 362 if (ostate != IEEE80211_S_INIT) { 363 /* NB: optimize INIT -> INIT case */ 364 ieee80211_reset_bss(vap); 365 } 366 break; 367 case IEEE80211_S_SCAN: 368 switch (ostate) { 369 case IEEE80211_S_INIT: 370 ieee80211_check_scan_current(vap); 371 break; 372 default: 373 break; 374 } 375 break; 376 case IEEE80211_S_RUN: 377 if (ostate == IEEE80211_S_INIT) { 378 /* 379 * Already have a channel; bypass the scan 380 * and startup immediately. 381 */ 382 error = ieee80211_create_wds(vap, ic->ic_curchan); 383 } 384 break; 385 default: 386 break; 387 } 388 return error; 389 } 390 391 /* 392 * Process a received frame. The node associated with the sender 393 * should be supplied. If nothing was found in the node table then 394 * the caller is assumed to supply a reference to iv_bss instead. 395 * The RSSI and a timestamp are also supplied. The RSSI data is used 396 * during AP scanning to select a AP to associate with; it can have 397 * any units so long as values have consistent units and higher values 398 * mean ``better signal''. The receive timestamp is currently not used 399 * by the 802.11 layer. 400 */ 401 static int 402 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 403 { 404 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 405 #define HAS_SEQ(type) ((type & 0x4) == 0) 406 struct ieee80211vap *vap = ni->ni_vap; 407 struct ieee80211com *ic = ni->ni_ic; 408 struct ifnet *ifp = vap->iv_ifp; 409 struct ieee80211_frame *wh; 410 struct ieee80211_key *key; 411 struct ether_header *eh; 412 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 413 uint8_t dir, type, subtype, qos; 414 uint16_t rxseq; 415 416 if (m->m_flags & M_AMPDU_MPDU) { 417 /* 418 * Fastpath for A-MPDU reorder q resubmission. Frames 419 * w/ M_AMPDU_MPDU marked have already passed through 420 * here but were received out of order and been held on 421 * the reorder queue. When resubmitted they are marked 422 * with the M_AMPDU_MPDU flag and we can bypass most of 423 * the normal processing. 424 */ 425 wh = mtod(m, struct ieee80211_frame *); 426 type = IEEE80211_FC0_TYPE_DATA; 427 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 428 subtype = IEEE80211_FC0_SUBTYPE_QOS; 429 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 430 goto resubmit_ampdu; 431 } 432 433 KASSERT(ni != NULL, ("null node")); 434 435 type = -1; /* undefined */ 436 437 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 438 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 439 ni->ni_macaddr, NULL, 440 "too short (1): len %u", m->m_pkthdr.len); 441 vap->iv_stats.is_rx_tooshort++; 442 goto out; 443 } 444 /* 445 * Bit of a cheat here, we use a pointer for a 3-address 446 * frame format but don't reference fields past outside 447 * ieee80211_frame_min w/o first validating the data is 448 * present. 449 */ 450 wh = mtod(m, struct ieee80211_frame *); 451 452 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 453 IEEE80211_FC0_VERSION_0) { 454 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 455 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 456 wh->i_fc[0], wh->i_fc[1]); 457 vap->iv_stats.is_rx_badversion++; 458 goto err; 459 } 460 461 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 462 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 463 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 464 465 /* NB: WDS vap's do not scan */ 466 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 467 IEEE80211_DISCARD_MAC(vap, 468 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 469 "too short (3): len %u", m->m_pkthdr.len); 470 vap->iv_stats.is_rx_tooshort++; 471 goto out; 472 } 473 /* NB: the TA is implicitly verified by finding the wds peer node */ 474 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 475 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 476 /* not interested in */ 477 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 478 wh->i_addr1, NULL, "%s", "not to bss"); 479 vap->iv_stats.is_rx_wrongbss++; 480 goto out; 481 } 482 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 483 ni->ni_noise = nf; 484 if (HAS_SEQ(type)) { 485 uint8_t tid = ieee80211_gettid(wh); 486 if (IEEE80211_QOS_HAS_SEQ(wh) && 487 TID_TO_WME_AC(tid) >= WME_AC_VI) 488 ic->ic_wme.wme_hipri_traffic++; 489 rxseq = le16toh(*(uint16_t *)wh->i_seq); 490 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 491 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 492 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 493 /* duplicate, discard */ 494 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 495 wh->i_addr1, "duplicate", 496 "seqno <%u,%u> fragno <%u,%u> tid %u", 497 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 498 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 499 rxseq & IEEE80211_SEQ_FRAG_MASK, 500 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 501 tid); 502 vap->iv_stats.is_rx_dup++; 503 IEEE80211_NODE_STAT(ni, rx_dup); 504 goto out; 505 } 506 ni->ni_rxseqs[tid] = rxseq; 507 } 508 switch (type) { 509 case IEEE80211_FC0_TYPE_DATA: 510 hdrspace = ieee80211_hdrspace(ic, wh); 511 if (m->m_len < hdrspace && 512 (m = m_pullup(m, hdrspace)) == NULL) { 513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 514 ni->ni_macaddr, NULL, 515 "data too short: expecting %u", hdrspace); 516 vap->iv_stats.is_rx_tooshort++; 517 goto out; /* XXX */ 518 } 519 if (dir != IEEE80211_FC1_DIR_DSTODS) { 520 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 521 wh, "data", "incorrect dir 0x%x", dir); 522 vap->iv_stats.is_rx_wrongdir++; 523 goto out; 524 } 525 /* 526 * Only legacy WDS traffic should take this path. 527 */ 528 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 529 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 530 wh, "data", "%s", "not legacy wds"); 531 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 532 goto out; 533 } 534 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 535 ni->ni_inact = ni->ni_inact_reload; 536 /* 537 * Handle A-MPDU re-ordering. If the frame is to be 538 * processed directly then ieee80211_ampdu_reorder 539 * will return 0; otherwise it has consumed the mbuf 540 * and we should do nothing more with it. 541 */ 542 if ((m->m_flags & M_AMPDU) && 543 ieee80211_ampdu_reorder(ni, m) != 0) { 544 m = NULL; 545 goto out; 546 } 547 resubmit_ampdu: 548 549 /* 550 * Handle privacy requirements. Note that we 551 * must not be preempted from here until after 552 * we (potentially) call ieee80211_crypto_demic; 553 * otherwise we may violate assumptions in the 554 * crypto cipher modules used to do delayed update 555 * of replay sequence numbers. 556 */ 557 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 558 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 559 /* 560 * Discard encrypted frames when privacy is off. 561 */ 562 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 563 wh, "WEP", "%s", "PRIVACY off"); 564 vap->iv_stats.is_rx_noprivacy++; 565 IEEE80211_NODE_STAT(ni, rx_noprivacy); 566 goto out; 567 } 568 key = ieee80211_crypto_decap(ni, m, hdrspace); 569 if (key == NULL) { 570 /* NB: stats+msgs handled in crypto_decap */ 571 IEEE80211_NODE_STAT(ni, rx_wepfail); 572 goto out; 573 } 574 wh = mtod(m, struct ieee80211_frame *); 575 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 576 } else { 577 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 578 key = NULL; 579 } 580 581 /* 582 * Save QoS bits for use below--before we strip the header. 583 */ 584 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 585 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 586 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 587 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 588 } else 589 qos = 0; 590 591 /* 592 * Next up, any fragmentation. 593 */ 594 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 595 m = ieee80211_defrag(ni, m, hdrspace); 596 if (m == NULL) { 597 /* Fragment dropped or frame not complete yet */ 598 goto out; 599 } 600 } 601 wh = NULL; /* no longer valid, catch any uses */ 602 603 /* 604 * Next strip any MSDU crypto bits. 605 */ 606 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 607 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 608 ni->ni_macaddr, "data", "%s", "demic error"); 609 vap->iv_stats.is_rx_demicfail++; 610 IEEE80211_NODE_STAT(ni, rx_demicfail); 611 goto out; 612 } 613 614 /* copy to listener after decrypt */ 615 if (ieee80211_radiotap_active_vap(vap)) 616 ieee80211_radiotap_rx(vap, m); 617 need_tap = 0; 618 619 /* 620 * Finally, strip the 802.11 header. 621 */ 622 m = ieee80211_decap(vap, m, hdrspace); 623 if (m == NULL) { 624 /* XXX mask bit to check for both */ 625 /* don't count Null data frames as errors */ 626 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 627 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 628 goto out; 629 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 630 ni->ni_macaddr, "data", "%s", "decap error"); 631 vap->iv_stats.is_rx_decap++; 632 IEEE80211_NODE_STAT(ni, rx_decap); 633 goto err; 634 } 635 eh = mtod(m, struct ether_header *); 636 if (!ieee80211_node_is_authorized(ni)) { 637 /* 638 * Deny any non-PAE frames received prior to 639 * authorization. For open/shared-key 640 * authentication the port is mark authorized 641 * after authentication completes. For 802.1x 642 * the port is not marked authorized by the 643 * authenticator until the handshake has completed. 644 */ 645 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 646 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 647 eh->ether_shost, "data", 648 "unauthorized port: ether type 0x%x len %u", 649 eh->ether_type, m->m_pkthdr.len); 650 vap->iv_stats.is_rx_unauth++; 651 IEEE80211_NODE_STAT(ni, rx_unauth); 652 goto err; 653 } 654 } else { 655 /* 656 * When denying unencrypted frames, discard 657 * any non-PAE frames received without encryption. 658 */ 659 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 660 (key == NULL && (m->m_flags & M_WEP) == 0) && 661 eh->ether_type != htons(ETHERTYPE_PAE)) { 662 /* 663 * Drop unencrypted frames. 664 */ 665 vap->iv_stats.is_rx_unencrypted++; 666 IEEE80211_NODE_STAT(ni, rx_unencrypted); 667 goto out; 668 } 669 } 670 /* XXX require HT? */ 671 if (qos & IEEE80211_QOS_AMSDU) { 672 m = ieee80211_decap_amsdu(ni, m); 673 if (m == NULL) 674 return IEEE80211_FC0_TYPE_DATA; 675 } else { 676 #ifdef IEEE80211_SUPPORT_SUPERG 677 m = ieee80211_decap_fastframe(vap, ni, m); 678 if (m == NULL) 679 return IEEE80211_FC0_TYPE_DATA; 680 #endif 681 } 682 ieee80211_deliver_data(vap, ni, m); 683 return IEEE80211_FC0_TYPE_DATA; 684 685 case IEEE80211_FC0_TYPE_MGT: 686 vap->iv_stats.is_rx_mgmt++; 687 IEEE80211_NODE_STAT(ni, rx_mgmt); 688 if (dir != IEEE80211_FC1_DIR_NODS) { 689 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 690 wh, "data", "incorrect dir 0x%x", dir); 691 vap->iv_stats.is_rx_wrongdir++; 692 goto err; 693 } 694 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 695 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 696 ni->ni_macaddr, "mgt", "too short: len %u", 697 m->m_pkthdr.len); 698 vap->iv_stats.is_rx_tooshort++; 699 goto out; 700 } 701 #ifdef IEEE80211_DEBUG 702 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 703 if_printf(ifp, "received %s from %6D rssi %d\n", 704 ieee80211_mgt_subtype_name[subtype >> 705 IEEE80211_FC0_SUBTYPE_SHIFT], 706 wh->i_addr2, ":", rssi); 707 } 708 #endif 709 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 710 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 711 wh, NULL, "%s", "WEP set but not permitted"); 712 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 713 goto out; 714 } 715 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 716 goto out; 717 718 case IEEE80211_FC0_TYPE_CTL: 719 vap->iv_stats.is_rx_ctl++; 720 IEEE80211_NODE_STAT(ni, rx_ctrl); 721 goto out; 722 723 default: 724 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 725 wh, "bad", "frame type 0x%x", type); 726 /* should not come here */ 727 break; 728 } 729 err: 730 ifp->if_ierrors++; 731 out: 732 if (m != NULL) { 733 if (need_tap && ieee80211_radiotap_active_vap(vap)) 734 ieee80211_radiotap_rx(vap, m); 735 m_freem(m); 736 } 737 return type; 738 #undef SEQ_LEQ 739 } 740 741 static void 742 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 743 int subtype, int rssi, int nf) 744 { 745 struct ieee80211vap *vap = ni->ni_vap; 746 struct ieee80211com *ic = ni->ni_ic; 747 struct ieee80211_frame *wh; 748 u_int8_t *frm, *efrm; 749 750 wh = mtod(m0, struct ieee80211_frame *); 751 frm = (u_int8_t *)&wh[1]; 752 efrm = mtod(m0, u_int8_t *) + m0->m_len; 753 switch (subtype) { 754 case IEEE80211_FC0_SUBTYPE_DEAUTH: 755 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 756 case IEEE80211_FC0_SUBTYPE_BEACON: 757 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 758 case IEEE80211_FC0_SUBTYPE_AUTH: 759 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 760 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 761 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 762 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 763 case IEEE80211_FC0_SUBTYPE_DISASSOC: 764 vap->iv_stats.is_rx_mgtdiscard++; 765 break; 766 case IEEE80211_FC0_SUBTYPE_ACTION: 767 if (vap->iv_state != IEEE80211_S_RUN || 768 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 769 vap->iv_stats.is_rx_mgtdiscard++; 770 break; 771 } 772 ni->ni_inact = ni->ni_inact_reload; 773 if (ieee80211_parse_action(ni, m0) == 0) 774 ic->ic_recv_action(ni, wh, frm, efrm); 775 break; 776 default: 777 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 778 wh, "mgt", "subtype 0x%x not handled", subtype); 779 vap->iv_stats.is_rx_badsubtype++; 780 break; 781 } 782 } 783