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 #ifdef IEEE80211_DEBUG 127 char ethstr[ETHER_ADDRSTRLEN + 1]; 128 #endif 129 130 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 131 "%s: creating link to %s on channel %u\n", __func__, 132 kether_ntoa(vap->iv_des_bssid, ethstr), ieee80211_chan2ieee(ic, chan)); 133 134 /* NB: vap create must specify the bssid for the link */ 135 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 136 /* NB: we should only be called on RUN transition */ 137 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 138 139 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 140 /* 141 * Dynamic/non-legacy WDS. Reference the associated 142 * station specified by the desired bssid setup at vap 143 * create. Point ni_wdsvap at the WDS vap so 4-address 144 * frames received through the associated AP vap will 145 * be dispatched upward (e.g. to a bridge) as though 146 * they arrived on the WDS vap. 147 */ 148 obss = NULL; 149 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 150 if (ni == NULL) { 151 /* 152 * Node went away before we could hookup. This 153 * should be ok; no traffic will flow and a leave 154 * event will be dispatched that should cause 155 * the vap to be destroyed. 156 */ 157 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 158 "%s: station %s went away\n", 159 __func__, kether_ntoa(vap->iv_des_bssid, ethstr)); 160 /* XXX stat? */ 161 } else if (ni->ni_wdsvap != NULL) { 162 /* 163 * Node already setup with a WDS vap; we cannot 164 * allow multiple references so disallow. If 165 * ni_wdsvap points at us that's ok; we should 166 * do nothing anyway. 167 */ 168 /* XXX printf instead? */ 169 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 170 "%s: station %s in use with %s\n", 171 __func__, kether_ntoa(vap->iv_des_bssid, ethstr), 172 ni->ni_wdsvap->iv_ifp->if_xname); 173 /* XXX stat? */ 174 } else { 175 /* 176 * Committed to new node, setup state. 177 */ 178 obss = vap->iv_bss; 179 vap->iv_bss = ni; 180 ni->ni_wdsvap = vap; 181 } 182 if (obss != NULL) { 183 /* NB: deferred to avoid recursive lock */ 184 ieee80211_free_node(obss); 185 } 186 } else { 187 /* 188 * Legacy WDS vap setup. 189 */ 190 /* 191 * The far end does not associate so we just create 192 * create a new node and install it as the vap's 193 * bss node. We must simulate an association and 194 * authorize the port for traffic to flow. 195 * XXX check if node already in sta table? 196 */ 197 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 198 if (ni != NULL) { 199 obss = vap->iv_bss; 200 vap->iv_bss = ieee80211_ref_node(ni); 201 ni->ni_flags |= IEEE80211_NODE_AREF; 202 if (obss != NULL) 203 ieee80211_free_node(obss); 204 /* give driver a chance to setup state like ni_txrate */ 205 if (ic->ic_newassoc != NULL) 206 ic->ic_newassoc(ni, 1); 207 /* tell the authenticator about new station */ 208 if (vap->iv_auth->ia_node_join != NULL) 209 vap->iv_auth->ia_node_join(ni); 210 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 211 ieee80211_node_authorize(ni); 212 213 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 214 /* XXX inject l2uf frame */ 215 } 216 } 217 218 /* 219 * Flush any pending frames now that were setup. 220 */ 221 if (ni != NULL) 222 wds_flush(ni); 223 return (ni == NULL ? ENOENT : 0); 224 } 225 226 /* 227 * Propagate multicast frames of an ap vap to all DWDS links. 228 * The caller is assumed to have verified this frame is multicast. 229 */ 230 void 231 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 232 { 233 struct ieee80211com *ic = vap0->iv_ic; 234 struct ifnet *parent = ic->ic_ifp; 235 const struct ether_header *eh = mtod(m, const struct ether_header *); 236 struct ieee80211_node *ni; 237 struct ieee80211vap *vap; 238 struct ifnet *ifp; 239 struct mbuf *mcopy; 240 int err; 241 char ethstr[ETHER_ADDRSTRLEN + 1] __debugvar; 242 243 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 244 ("%s not mcast", kether_ntoa(eh->ether_dhost, ethstr))); 245 246 /* XXX locking */ 247 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 248 /* only DWDS vaps are interesting */ 249 if (vap->iv_opmode != IEEE80211_M_WDS || 250 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 251 continue; 252 /* if it came in this interface, don't send it back out */ 253 ifp = vap->iv_ifp; 254 if (ifp == m->m_pkthdr.rcvif) 255 continue; 256 /* 257 * Duplicate the frame and send it. 258 */ 259 mcopy = m_copypacket(m, MB_DONTWAIT); 260 if (mcopy == NULL) { 261 IFNET_STAT_INC(ifp, oerrors, 1); 262 /* XXX stat + msg */ 263 continue; 264 } 265 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 266 if (ni == NULL) { 267 /* NB: ieee80211_find_txnode does stat+msg */ 268 IFNET_STAT_INC(ifp, oerrors, 1); 269 m_freem(mcopy); 270 continue; 271 } 272 /* calculate priority so drivers can find the tx queue */ 273 if (ieee80211_classify(ni, mcopy)) { 274 IEEE80211_DISCARD_MAC(vap, 275 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 276 eh->ether_dhost, NULL, 277 "%s", "classification failure"); 278 vap->iv_stats.is_tx_classify++; 279 IFNET_STAT_INC(ifp, oerrors, 1); 280 m_freem(mcopy); 281 ieee80211_free_node(ni); 282 continue; 283 } 284 285 BPF_MTAP(ifp, m); /* 802.3 tx */ 286 287 /* 288 * Encapsulate the packet in prep for transmission. 289 */ 290 mcopy = ieee80211_encap(vap, ni, mcopy); 291 if (mcopy == NULL) { 292 /* NB: stat+msg handled in ieee80211_encap */ 293 ieee80211_free_node(ni); 294 continue; 295 } 296 mcopy->m_flags |= M_MCAST; 297 mcopy->m_pkthdr.rcvif = (void *) ni; 298 299 err = ieee80211_handoff(parent, mcopy); 300 if (err) { 301 /* NB: IFQ_HANDOFF reclaims mbuf */ 302 IFNET_STAT_INC(ifp, oerrors, 1); 303 ieee80211_free_node(ni); 304 } else 305 IFNET_STAT_INC(ifp, opackets, 1); 306 } 307 } 308 309 /* 310 * Handle DWDS discovery on receipt of a 4-address frame in 311 * ap mode. Queue the frame and post an event for someone 312 * to plumb the necessary WDS vap for this station. Frames 313 * received prior to the vap set running will then be reprocessed 314 * as if they were just received. 315 */ 316 void 317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 318 { 319 struct ieee80211com *ic = ni->ni_ic; 320 321 /* 322 * Save the frame with an aging interval 4 times 323 * the listen interval specified by the station. 324 * Frames that sit around too long are reclaimed 325 * using this information. 326 * XXX handle overflow? 327 * XXX per/vap beacon interval? 328 */ 329 m->m_pkthdr.rcvif = (void *)(uintptr_t) 330 ieee80211_mac_hash(ic, ni->ni_macaddr); 331 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 332 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 333 ieee80211_notify_wds_discover(ni); 334 } 335 336 /* 337 * IEEE80211_M_WDS vap state machine handler. 338 */ 339 static int 340 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 341 { 342 struct ieee80211com *ic = vap->iv_ic; 343 enum ieee80211_state ostate; 344 int error; 345 346 ostate = vap->iv_state; 347 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 348 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 349 vap->iv_state = nstate; /* state transition */ 350 callout_stop(&vap->iv_mgtsend); 351 if (ostate != IEEE80211_S_SCAN) 352 ieee80211_cancel_scan(vap); /* background scan */ 353 error = 0; 354 switch (nstate) { 355 case IEEE80211_S_INIT: 356 switch (ostate) { 357 case IEEE80211_S_SCAN: 358 ieee80211_cancel_scan(vap); 359 break; 360 default: 361 break; 362 } 363 if (ostate != IEEE80211_S_INIT) { 364 /* NB: optimize INIT -> INIT case */ 365 ieee80211_reset_bss(vap); 366 } 367 break; 368 case IEEE80211_S_SCAN: 369 switch (ostate) { 370 case IEEE80211_S_INIT: 371 ieee80211_check_scan_current(vap); 372 break; 373 default: 374 break; 375 } 376 break; 377 case IEEE80211_S_RUN: 378 if (ostate == IEEE80211_S_INIT) { 379 /* 380 * Already have a channel; bypass the scan 381 * and startup immediately. 382 */ 383 error = ieee80211_create_wds(vap, ic->ic_curchan); 384 } 385 break; 386 default: 387 break; 388 } 389 return error; 390 } 391 392 /* 393 * Process a received frame. The node associated with the sender 394 * should be supplied. If nothing was found in the node table then 395 * the caller is assumed to supply a reference to iv_bss instead. 396 * The RSSI and a timestamp are also supplied. The RSSI data is used 397 * during AP scanning to select a AP to associate with; it can have 398 * any units so long as values have consistent units and higher values 399 * mean ``better signal''. The receive timestamp is currently not used 400 * by the 802.11 layer. 401 */ 402 static int 403 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 404 { 405 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 406 #define HAS_SEQ(type) ((type & 0x4) == 0) 407 struct ieee80211vap *vap = ni->ni_vap; 408 struct ieee80211com *ic = ni->ni_ic; 409 struct ifnet *ifp = vap->iv_ifp; 410 struct ieee80211_frame *wh; 411 struct ieee80211_key *key; 412 struct ether_header *eh; 413 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 414 uint8_t dir, type, subtype, qos; 415 uint16_t rxseq; 416 #ifdef IEEE80211_DEBUG 417 char ethstr[ETHER_ADDRSTRLEN + 1]; 418 #endif 419 if (m->m_flags & M_AMPDU_MPDU) { 420 /* 421 * Fastpath for A-MPDU reorder q resubmission. Frames 422 * w/ M_AMPDU_MPDU marked have already passed through 423 * here but were received out of order and been held on 424 * the reorder queue. When resubmitted they are marked 425 * with the M_AMPDU_MPDU flag and we can bypass most of 426 * the normal processing. 427 */ 428 wh = mtod(m, struct ieee80211_frame *); 429 type = IEEE80211_FC0_TYPE_DATA; 430 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 431 subtype = IEEE80211_FC0_SUBTYPE_QOS; 432 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 433 goto resubmit_ampdu; 434 } 435 436 KASSERT(ni != NULL, ("null node")); 437 438 type = -1; /* undefined */ 439 440 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 441 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 442 ni->ni_macaddr, NULL, 443 "too short (1): len %u", m->m_pkthdr.len); 444 vap->iv_stats.is_rx_tooshort++; 445 goto out; 446 } 447 /* 448 * Bit of a cheat here, we use a pointer for a 3-address 449 * frame format but don't reference fields past outside 450 * ieee80211_frame_min w/o first validating the data is 451 * present. 452 */ 453 wh = mtod(m, struct ieee80211_frame *); 454 455 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 456 IEEE80211_FC0_VERSION_0) { 457 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 458 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 459 wh->i_fc[0], wh->i_fc[1]); 460 vap->iv_stats.is_rx_badversion++; 461 goto err; 462 } 463 464 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 465 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 466 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 467 468 /* NB: WDS vap's do not scan */ 469 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 470 IEEE80211_DISCARD_MAC(vap, 471 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 472 "too short (3): len %u", m->m_pkthdr.len); 473 vap->iv_stats.is_rx_tooshort++; 474 goto out; 475 } 476 /* NB: the TA is implicitly verified by finding the wds peer node */ 477 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 478 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 479 /* not interested in */ 480 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 481 wh->i_addr1, NULL, "%s", "not to bss"); 482 vap->iv_stats.is_rx_wrongbss++; 483 goto out; 484 } 485 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 486 ni->ni_noise = nf; 487 if (HAS_SEQ(type)) { 488 uint8_t tid = ieee80211_gettid(wh); 489 if (IEEE80211_QOS_HAS_SEQ(wh) && 490 TID_TO_WME_AC(tid) >= WME_AC_VI) 491 ic->ic_wme.wme_hipri_traffic++; 492 rxseq = le16toh(*(uint16_t *)wh->i_seq); 493 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 494 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 495 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 496 /* duplicate, discard */ 497 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 498 wh->i_addr1, "duplicate", 499 "seqno <%u,%u> fragno <%u,%u> tid %u", 500 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 501 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 502 rxseq & IEEE80211_SEQ_FRAG_MASK, 503 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 504 tid); 505 vap->iv_stats.is_rx_dup++; 506 IEEE80211_NODE_STAT(ni, rx_dup); 507 goto out; 508 } 509 ni->ni_rxseqs[tid] = rxseq; 510 } 511 switch (type) { 512 case IEEE80211_FC0_TYPE_DATA: 513 hdrspace = ieee80211_hdrspace(ic, wh); 514 if (m->m_len < hdrspace && 515 (m = m_pullup(m, hdrspace)) == NULL) { 516 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 517 ni->ni_macaddr, NULL, 518 "data too short: expecting %u", hdrspace); 519 vap->iv_stats.is_rx_tooshort++; 520 goto out; /* XXX */ 521 } 522 if (dir != IEEE80211_FC1_DIR_DSTODS) { 523 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 524 wh, "data", "incorrect dir 0x%x", dir); 525 vap->iv_stats.is_rx_wrongdir++; 526 goto out; 527 } 528 /* 529 * Only legacy WDS traffic should take this path. 530 */ 531 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 532 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 533 wh, "data", "%s", "not legacy wds"); 534 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 535 goto out; 536 } 537 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 538 ni->ni_inact = ni->ni_inact_reload; 539 /* 540 * Handle A-MPDU re-ordering. If the frame is to be 541 * processed directly then ieee80211_ampdu_reorder 542 * will return 0; otherwise it has consumed the mbuf 543 * and we should do nothing more with it. 544 */ 545 if ((m->m_flags & M_AMPDU) && 546 ieee80211_ampdu_reorder(ni, m) != 0) { 547 m = NULL; 548 goto out; 549 } 550 resubmit_ampdu: 551 552 /* 553 * Handle privacy requirements. Note that we 554 * must not be preempted from here until after 555 * we (potentially) call ieee80211_crypto_demic; 556 * otherwise we may violate assumptions in the 557 * crypto cipher modules used to do delayed update 558 * of replay sequence numbers. 559 */ 560 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 561 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 562 /* 563 * Discard encrypted frames when privacy is off. 564 */ 565 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 566 wh, "WEP", "%s", "PRIVACY off"); 567 vap->iv_stats.is_rx_noprivacy++; 568 IEEE80211_NODE_STAT(ni, rx_noprivacy); 569 goto out; 570 } 571 key = ieee80211_crypto_decap(ni, m, hdrspace); 572 if (key == NULL) { 573 /* NB: stats+msgs handled in crypto_decap */ 574 IEEE80211_NODE_STAT(ni, rx_wepfail); 575 goto out; 576 } 577 wh = mtod(m, struct ieee80211_frame *); 578 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 579 } else { 580 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 581 key = NULL; 582 } 583 584 /* 585 * Save QoS bits for use below--before we strip the header. 586 */ 587 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 588 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 589 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 590 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 591 } else 592 qos = 0; 593 594 /* 595 * Next up, any fragmentation. 596 */ 597 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 598 m = ieee80211_defrag(ni, m, hdrspace); 599 if (m == NULL) { 600 /* Fragment dropped or frame not complete yet */ 601 goto out; 602 } 603 } 604 wh = NULL; /* no longer valid, catch any uses */ 605 606 /* 607 * Next strip any MSDU crypto bits. 608 */ 609 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 610 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 611 ni->ni_macaddr, "data", "%s", "demic error"); 612 vap->iv_stats.is_rx_demicfail++; 613 IEEE80211_NODE_STAT(ni, rx_demicfail); 614 goto out; 615 } 616 617 /* copy to listener after decrypt */ 618 if (ieee80211_radiotap_active_vap(vap)) 619 ieee80211_radiotap_rx(vap, m); 620 need_tap = 0; 621 622 /* 623 * Finally, strip the 802.11 header. 624 */ 625 m = ieee80211_decap(vap, m, hdrspace); 626 if (m == NULL) { 627 /* XXX mask bit to check for both */ 628 /* don't count Null data frames as errors */ 629 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 630 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 631 goto out; 632 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 633 ni->ni_macaddr, "data", "%s", "decap error"); 634 vap->iv_stats.is_rx_decap++; 635 IEEE80211_NODE_STAT(ni, rx_decap); 636 goto err; 637 } 638 eh = mtod(m, struct ether_header *); 639 if (!ieee80211_node_is_authorized(ni)) { 640 /* 641 * Deny any non-PAE frames received prior to 642 * authorization. For open/shared-key 643 * authentication the port is mark authorized 644 * after authentication completes. For 802.1x 645 * the port is not marked authorized by the 646 * authenticator until the handshake has completed. 647 */ 648 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 649 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 650 eh->ether_shost, "data", 651 "unauthorized port: ether type 0x%x len %u", 652 eh->ether_type, m->m_pkthdr.len); 653 vap->iv_stats.is_rx_unauth++; 654 IEEE80211_NODE_STAT(ni, rx_unauth); 655 goto err; 656 } 657 } else { 658 /* 659 * When denying unencrypted frames, discard 660 * any non-PAE frames received without encryption. 661 */ 662 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 663 (key == NULL && (m->m_flags & M_WEP) == 0) && 664 eh->ether_type != htons(ETHERTYPE_PAE)) { 665 /* 666 * Drop unencrypted frames. 667 */ 668 vap->iv_stats.is_rx_unencrypted++; 669 IEEE80211_NODE_STAT(ni, rx_unencrypted); 670 goto out; 671 } 672 } 673 /* XXX require HT? */ 674 if (qos & IEEE80211_QOS_AMSDU) { 675 m = ieee80211_decap_amsdu(ni, m); 676 if (m == NULL) 677 return IEEE80211_FC0_TYPE_DATA; 678 } else { 679 #ifdef IEEE80211_SUPPORT_SUPERG 680 m = ieee80211_decap_fastframe(vap, ni, m); 681 if (m == NULL) 682 return IEEE80211_FC0_TYPE_DATA; 683 #endif 684 } 685 ieee80211_deliver_data(vap, ni, m); 686 return IEEE80211_FC0_TYPE_DATA; 687 688 case IEEE80211_FC0_TYPE_MGT: 689 vap->iv_stats.is_rx_mgmt++; 690 IEEE80211_NODE_STAT(ni, rx_mgmt); 691 if (dir != IEEE80211_FC1_DIR_NODS) { 692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 693 wh, "data", "incorrect dir 0x%x", dir); 694 vap->iv_stats.is_rx_wrongdir++; 695 goto err; 696 } 697 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 698 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 699 ni->ni_macaddr, "mgt", "too short: len %u", 700 m->m_pkthdr.len); 701 vap->iv_stats.is_rx_tooshort++; 702 goto out; 703 } 704 #ifdef IEEE80211_DEBUG 705 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 706 if_printf(ifp, "received %s from %s rssi %d\n", 707 ieee80211_mgt_subtype_name[subtype >> 708 IEEE80211_FC0_SUBTYPE_SHIFT], 709 kether_ntoa(wh->i_addr2, ethstr), rssi); 710 } 711 #endif 712 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 713 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 714 wh, NULL, "%s", "WEP set but not permitted"); 715 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 716 goto out; 717 } 718 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 719 goto out; 720 721 case IEEE80211_FC0_TYPE_CTL: 722 vap->iv_stats.is_rx_ctl++; 723 IEEE80211_NODE_STAT(ni, rx_ctrl); 724 goto out; 725 726 default: 727 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 728 wh, "bad", "frame type 0x%x", type); 729 /* should not come here */ 730 break; 731 } 732 err: 733 IFNET_STAT_INC(ifp, ierrors, 1); 734 out: 735 if (m != NULL) { 736 if (need_tap && ieee80211_radiotap_active_vap(vap)) 737 ieee80211_radiotap_rx(vap, m); 738 m_freem(m); 739 } 740 return type; 741 #undef SEQ_LEQ 742 } 743 744 static void 745 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 746 int subtype, int rssi, int nf) 747 { 748 struct ieee80211vap *vap = ni->ni_vap; 749 struct ieee80211com *ic = ni->ni_ic; 750 struct ieee80211_frame *wh; 751 u_int8_t *frm, *efrm; 752 753 wh = mtod(m0, struct ieee80211_frame *); 754 frm = (u_int8_t *)&wh[1]; 755 efrm = mtod(m0, u_int8_t *) + m0->m_len; 756 switch (subtype) { 757 case IEEE80211_FC0_SUBTYPE_DEAUTH: 758 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 759 case IEEE80211_FC0_SUBTYPE_BEACON: 760 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 761 case IEEE80211_FC0_SUBTYPE_AUTH: 762 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 763 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 764 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 765 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 766 case IEEE80211_FC0_SUBTYPE_DISASSOC: 767 vap->iv_stats.is_rx_mgtdiscard++; 768 break; 769 case IEEE80211_FC0_SUBTYPE_ACTION: 770 if (vap->iv_state != IEEE80211_S_RUN || 771 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 772 vap->iv_stats.is_rx_mgtdiscard++; 773 break; 774 } 775 ni->ni_inact = ni->ni_inact_reload; 776 if (ieee80211_parse_action(ni, m0) == 0) 777 ic->ic_recv_action(ni, wh, frm, efrm); 778 break; 779 default: 780 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 781 wh, "mgt", "subtype 0x%x not handled", subtype); 782 vap->iv_stats.is_rx_badsubtype++; 783 break; 784 } 785 } 786