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