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 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 WDS mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_wds.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 64 static void wds_vattach(struct ieee80211vap *); 65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 66 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int); 67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 68 int subtype, int, int); 69 70 void 71 ieee80211_wds_attach(struct ieee80211com *ic) 72 { 73 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 74 } 75 76 void 77 ieee80211_wds_detach(struct ieee80211com *ic) 78 { 79 } 80 81 static void 82 wds_vdetach(struct ieee80211vap *vap) 83 { 84 if (vap->iv_bss != NULL) { 85 /* XXX locking? */ 86 if (vap->iv_bss->ni_wdsvap == vap) 87 vap->iv_bss->ni_wdsvap = NULL; 88 } 89 } 90 91 static void 92 wds_vattach(struct ieee80211vap *vap) 93 { 94 vap->iv_newstate = wds_newstate; 95 vap->iv_input = wds_input; 96 vap->iv_recv_mgmt = wds_recv_mgmt; 97 vap->iv_opdetach = wds_vdetach; 98 } 99 100 static void 101 wds_flush(struct ieee80211_node *ni) 102 { 103 struct ieee80211com *ic = ni->ni_ic; 104 struct mbuf *m, *next; 105 int8_t rssi, nf; 106 107 m = ieee80211_ageq_remove(&ic->ic_stageq, 108 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 109 if (m == NULL) 110 return; 111 112 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 113 "%s", "flush wds queue"); 114 ic->ic_node_getsignal(ni, &rssi, &nf); 115 for (; m != NULL; m = next) { 116 next = m->m_nextpkt; 117 m->m_nextpkt = NULL; 118 ieee80211_input(ni, m, rssi, nf); 119 } 120 } 121 122 static int 123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 124 { 125 struct ieee80211com *ic = vap->iv_ic; 126 struct ieee80211_node_table *nt = &ic->ic_sta; 127 struct ieee80211_node *ni, *obss; 128 129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 130 "%s: creating link to %s on channel %u\n", __func__, 131 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 132 133 /* NB: vap create must specify the bssid for the link */ 134 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 135 /* NB: we should only be called on RUN transition */ 136 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 137 138 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 139 /* 140 * Dynamic/non-legacy WDS. Reference the associated 141 * station specified by the desired bssid setup at vap 142 * create. Point ni_wdsvap at the WDS vap so 4-address 143 * frames received through the associated AP vap will 144 * be dispatched upward (e.g. to a bridge) as though 145 * they arrived on the WDS vap. 146 */ 147 IEEE80211_NODE_LOCK(nt); 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__, ether_sprintf(vap->iv_des_bssid)); 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__, ether_sprintf(vap->iv_des_bssid), 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 IEEE80211_NODE_UNLOCK(nt); 183 if (obss != NULL) { 184 /* NB: deferred to avoid recursive lock */ 185 ieee80211_free_node(obss); 186 } 187 } else { 188 /* 189 * Legacy WDS vap setup. 190 */ 191 /* 192 * The far end does not associate so we just create 193 * create a new node and install it as the vap's 194 * bss node. We must simulate an association and 195 * authorize the port for traffic to flow. 196 * XXX check if node already in sta table? 197 */ 198 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 199 if (ni != NULL) { 200 obss = vap->iv_bss; 201 vap->iv_bss = ieee80211_ref_node(ni); 202 ni->ni_flags |= IEEE80211_NODE_AREF; 203 if (obss != NULL) 204 ieee80211_free_node(obss); 205 /* give driver a chance to setup state like ni_txrate */ 206 if (ic->ic_newassoc != NULL) 207 ic->ic_newassoc(ni, 1); 208 /* tell the authenticator about new station */ 209 if (vap->iv_auth->ia_node_join != NULL) 210 vap->iv_auth->ia_node_join(ni); 211 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 212 ieee80211_node_authorize(ni); 213 214 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 215 /* XXX inject l2uf frame */ 216 } 217 } 218 219 /* 220 * Flush any pending frames now that were setup. 221 */ 222 if (ni != NULL) 223 wds_flush(ni); 224 return (ni == NULL ? ENOENT : 0); 225 } 226 227 /* 228 * Propagate multicast frames of an ap vap to all DWDS links. 229 * The caller is assumed to have verified this frame is multicast. 230 */ 231 void 232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 233 { 234 struct ieee80211com *ic = vap0->iv_ic; 235 struct ifnet *parent = ic->ic_ifp; 236 const struct ether_header *eh = mtod(m, const struct ether_header *); 237 struct ieee80211_node *ni; 238 struct ieee80211vap *vap; 239 struct ifnet *ifp; 240 struct mbuf *mcopy; 241 int err; 242 243 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 244 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 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, M_DONTWAIT); 260 if (mcopy == NULL) { 261 ifp->if_oerrors++; 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 ifp->if_oerrors++; 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 ifp->if_oerrors++; 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 = parent->if_transmit(parent, mcopy); 300 if (err) { 301 /* NB: IFQ_HANDOFF reclaims mbuf */ 302 ifp->if_oerrors++; 303 ieee80211_free_node(ni); 304 } else 305 ifp->if_opackets++; 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 struct ieee80211_node *ni; 344 enum ieee80211_state ostate; 345 int error; 346 347 IEEE80211_LOCK_ASSERT(ic); 348 349 ostate = vap->iv_state; 350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 351 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 352 vap->iv_state = nstate; /* state transition */ 353 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 354 if (ostate != IEEE80211_S_SCAN) 355 ieee80211_cancel_scan(vap); /* background scan */ 356 ni = vap->iv_bss; /* NB: no reference held */ 357 error = 0; 358 switch (nstate) { 359 case IEEE80211_S_INIT: 360 switch (ostate) { 361 case IEEE80211_S_SCAN: 362 ieee80211_cancel_scan(vap); 363 break; 364 default: 365 break; 366 } 367 if (ostate != IEEE80211_S_INIT) { 368 /* NB: optimize INIT -> INIT case */ 369 ieee80211_reset_bss(vap); 370 } 371 break; 372 case IEEE80211_S_SCAN: 373 switch (ostate) { 374 case IEEE80211_S_INIT: 375 ieee80211_check_scan_current(vap); 376 break; 377 default: 378 break; 379 } 380 break; 381 case IEEE80211_S_RUN: 382 if (ostate == IEEE80211_S_INIT) { 383 /* 384 * Already have a channel; bypass the scan 385 * and startup immediately. 386 */ 387 error = ieee80211_create_wds(vap, ic->ic_curchan); 388 } 389 break; 390 default: 391 break; 392 } 393 return error; 394 } 395 396 /* 397 * Process a received frame. The node associated with the sender 398 * should be supplied. If nothing was found in the node table then 399 * the caller is assumed to supply a reference to iv_bss instead. 400 * The RSSI and a timestamp are also supplied. The RSSI data is used 401 * during AP scanning to select a AP to associate with; it can have 402 * any units so long as values have consistent units and higher values 403 * mean ``better signal''. The receive timestamp is currently not used 404 * by the 802.11 layer. 405 */ 406 static int 407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 408 { 409 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 410 #define HAS_SEQ(type) ((type & 0x4) == 0) 411 struct ieee80211vap *vap = ni->ni_vap; 412 struct ieee80211com *ic = ni->ni_ic; 413 struct ifnet *ifp = vap->iv_ifp; 414 struct ieee80211_frame *wh; 415 struct ieee80211_key *key; 416 struct ether_header *eh; 417 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 418 uint8_t dir, type, subtype, qos; 419 uint16_t rxseq; 420 421 if (m->m_flags & M_AMPDU_MPDU) { 422 /* 423 * Fastpath for A-MPDU reorder q resubmission. Frames 424 * w/ M_AMPDU_MPDU marked have already passed through 425 * here but were received out of order and been held on 426 * the reorder queue. When resubmitted they are marked 427 * with the M_AMPDU_MPDU flag and we can bypass most of 428 * the normal processing. 429 */ 430 wh = mtod(m, struct ieee80211_frame *); 431 type = IEEE80211_FC0_TYPE_DATA; 432 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 433 subtype = IEEE80211_FC0_SUBTYPE_QOS; 434 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 435 goto resubmit_ampdu; 436 } 437 438 KASSERT(ni != NULL, ("null node")); 439 440 type = -1; /* undefined */ 441 442 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 443 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 444 ni->ni_macaddr, NULL, 445 "too short (1): len %u", m->m_pkthdr.len); 446 vap->iv_stats.is_rx_tooshort++; 447 goto out; 448 } 449 /* 450 * Bit of a cheat here, we use a pointer for a 3-address 451 * frame format but don't reference fields past outside 452 * ieee80211_frame_min w/o first validating the data is 453 * present. 454 */ 455 wh = mtod(m, struct ieee80211_frame *); 456 457 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 458 ni->ni_inact = ni->ni_inact_reload; 459 460 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 461 IEEE80211_FC0_VERSION_0) { 462 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 463 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 464 wh->i_fc[0], wh->i_fc[1]); 465 vap->iv_stats.is_rx_badversion++; 466 goto err; 467 } 468 469 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 470 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 471 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 472 473 /* NB: WDS vap's do not scan */ 474 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 475 IEEE80211_DISCARD_MAC(vap, 476 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 477 "too short (3): len %u", m->m_pkthdr.len); 478 vap->iv_stats.is_rx_tooshort++; 479 goto out; 480 } 481 /* NB: the TA is implicitly verified by finding the wds peer node */ 482 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 483 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 484 /* not interested in */ 485 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 486 wh->i_addr1, NULL, "%s", "not to bss"); 487 vap->iv_stats.is_rx_wrongbss++; 488 goto out; 489 } 490 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 491 ni->ni_noise = nf; 492 if (HAS_SEQ(type)) { 493 uint8_t tid = ieee80211_gettid(wh); 494 if (IEEE80211_QOS_HAS_SEQ(wh) && 495 TID_TO_WME_AC(tid) >= WME_AC_VI) 496 ic->ic_wme.wme_hipri_traffic++; 497 rxseq = le16toh(*(uint16_t *)wh->i_seq); 498 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 499 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 500 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 501 /* duplicate, discard */ 502 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 503 wh->i_addr1, "duplicate", 504 "seqno <%u,%u> fragno <%u,%u> tid %u", 505 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 506 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 507 rxseq & IEEE80211_SEQ_FRAG_MASK, 508 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 509 tid); 510 vap->iv_stats.is_rx_dup++; 511 IEEE80211_NODE_STAT(ni, rx_dup); 512 goto out; 513 } 514 ni->ni_rxseqs[tid] = rxseq; 515 } 516 switch (type) { 517 case IEEE80211_FC0_TYPE_DATA: 518 hdrspace = ieee80211_hdrspace(ic, wh); 519 if (m->m_len < hdrspace && 520 (m = m_pullup(m, hdrspace)) == NULL) { 521 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 522 ni->ni_macaddr, NULL, 523 "data too short: expecting %u", hdrspace); 524 vap->iv_stats.is_rx_tooshort++; 525 goto out; /* XXX */ 526 } 527 if (dir != IEEE80211_FC1_DIR_DSTODS) { 528 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 529 wh, "data", "incorrect dir 0x%x", dir); 530 vap->iv_stats.is_rx_wrongdir++; 531 goto out; 532 } 533 /* 534 * Only legacy WDS traffic should take this path. 535 */ 536 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 537 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 538 wh, "data", "%s", "not legacy wds"); 539 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 540 goto out; 541 } 542 /* 543 * Handle A-MPDU re-ordering. If the frame is to be 544 * processed directly then ieee80211_ampdu_reorder 545 * will return 0; otherwise it has consumed the mbuf 546 * and we should do nothing more with it. 547 */ 548 if ((m->m_flags & M_AMPDU) && 549 ieee80211_ampdu_reorder(ni, m) != 0) { 550 m = NULL; 551 goto out; 552 } 553 resubmit_ampdu: 554 555 /* 556 * Handle privacy requirements. Note that we 557 * must not be preempted from here until after 558 * we (potentially) call ieee80211_crypto_demic; 559 * otherwise we may violate assumptions in the 560 * crypto cipher modules used to do delayed update 561 * of replay sequence numbers. 562 */ 563 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 564 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 565 /* 566 * Discard encrypted frames when privacy is off. 567 */ 568 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 569 wh, "WEP", "%s", "PRIVACY off"); 570 vap->iv_stats.is_rx_noprivacy++; 571 IEEE80211_NODE_STAT(ni, rx_noprivacy); 572 goto out; 573 } 574 key = ieee80211_crypto_decap(ni, m, hdrspace); 575 if (key == NULL) { 576 /* NB: stats+msgs handled in crypto_decap */ 577 IEEE80211_NODE_STAT(ni, rx_wepfail); 578 goto out; 579 } 580 wh = mtod(m, struct ieee80211_frame *); 581 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 582 } else { 583 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 584 key = NULL; 585 } 586 587 /* 588 * Save QoS bits for use below--before we strip the header. 589 */ 590 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 591 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 592 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 593 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 594 } else 595 qos = 0; 596 597 /* 598 * Next up, any fragmentation. 599 */ 600 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 601 m = ieee80211_defrag(ni, m, hdrspace); 602 if (m == NULL) { 603 /* Fragment dropped or frame not complete yet */ 604 goto out; 605 } 606 } 607 wh = NULL; /* no longer valid, catch any uses */ 608 609 /* 610 * Next strip any MSDU crypto bits. 611 */ 612 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 613 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 614 ni->ni_macaddr, "data", "%s", "demic error"); 615 vap->iv_stats.is_rx_demicfail++; 616 IEEE80211_NODE_STAT(ni, rx_demicfail); 617 goto out; 618 } 619 620 /* copy to listener after decrypt */ 621 if (ieee80211_radiotap_active_vap(vap)) 622 ieee80211_radiotap_rx(vap, m); 623 need_tap = 0; 624 625 /* 626 * Finally, strip the 802.11 header. 627 */ 628 m = ieee80211_decap(vap, m, hdrspace); 629 if (m == NULL) { 630 /* XXX mask bit to check for both */ 631 /* don't count Null data frames as errors */ 632 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 633 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 634 goto out; 635 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 636 ni->ni_macaddr, "data", "%s", "decap error"); 637 vap->iv_stats.is_rx_decap++; 638 IEEE80211_NODE_STAT(ni, rx_decap); 639 goto err; 640 } 641 eh = mtod(m, struct ether_header *); 642 if (!ieee80211_node_is_authorized(ni)) { 643 /* 644 * Deny any non-PAE frames received prior to 645 * authorization. For open/shared-key 646 * authentication the port is mark authorized 647 * after authentication completes. For 802.1x 648 * the port is not marked authorized by the 649 * authenticator until the handshake has completed. 650 */ 651 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 652 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 653 eh->ether_shost, "data", 654 "unauthorized port: ether type 0x%x len %u", 655 eh->ether_type, m->m_pkthdr.len); 656 vap->iv_stats.is_rx_unauth++; 657 IEEE80211_NODE_STAT(ni, rx_unauth); 658 goto err; 659 } 660 } else { 661 /* 662 * When denying unencrypted frames, discard 663 * any non-PAE frames received without encryption. 664 */ 665 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 666 (key == NULL && (m->m_flags & M_WEP) == 0) && 667 eh->ether_type != htons(ETHERTYPE_PAE)) { 668 /* 669 * Drop unencrypted frames. 670 */ 671 vap->iv_stats.is_rx_unencrypted++; 672 IEEE80211_NODE_STAT(ni, rx_unencrypted); 673 goto out; 674 } 675 } 676 /* XXX require HT? */ 677 if (qos & IEEE80211_QOS_AMSDU) { 678 m = ieee80211_decap_amsdu(ni, m); 679 if (m == NULL) 680 return IEEE80211_FC0_TYPE_DATA; 681 } else { 682 #ifdef IEEE80211_SUPPORT_SUPERG 683 m = ieee80211_decap_fastframe(vap, ni, m); 684 if (m == NULL) 685 return IEEE80211_FC0_TYPE_DATA; 686 #endif 687 } 688 ieee80211_deliver_data(vap, ni, m); 689 return IEEE80211_FC0_TYPE_DATA; 690 691 case IEEE80211_FC0_TYPE_MGT: 692 vap->iv_stats.is_rx_mgmt++; 693 IEEE80211_NODE_STAT(ni, rx_mgmt); 694 if (dir != IEEE80211_FC1_DIR_NODS) { 695 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 696 wh, "data", "incorrect dir 0x%x", dir); 697 vap->iv_stats.is_rx_wrongdir++; 698 goto err; 699 } 700 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 701 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 702 ni->ni_macaddr, "mgt", "too short: len %u", 703 m->m_pkthdr.len); 704 vap->iv_stats.is_rx_tooshort++; 705 goto out; 706 } 707 #ifdef IEEE80211_DEBUG 708 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 709 if_printf(ifp, "received %s from %s rssi %d\n", 710 ieee80211_mgt_subtype_name[subtype >> 711 IEEE80211_FC0_SUBTYPE_SHIFT], 712 ether_sprintf(wh->i_addr2), rssi); 713 } 714 #endif 715 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 716 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 717 wh, NULL, "%s", "WEP set but not permitted"); 718 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 719 goto out; 720 } 721 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 722 goto out; 723 724 case IEEE80211_FC0_TYPE_CTL: 725 vap->iv_stats.is_rx_ctl++; 726 IEEE80211_NODE_STAT(ni, rx_ctrl); 727 goto out; 728 729 default: 730 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 731 wh, "bad", "frame type 0x%x", type); 732 /* should not come here */ 733 break; 734 } 735 err: 736 ifp->if_ierrors++; 737 out: 738 if (m != NULL) { 739 if (need_tap && ieee80211_radiotap_active_vap(vap)) 740 ieee80211_radiotap_rx(vap, m); 741 m_freem(m); 742 } 743 return type; 744 #undef SEQ_LEQ 745 } 746 747 static void 748 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 749 int subtype, int rssi, int nf) 750 { 751 struct ieee80211vap *vap = ni->ni_vap; 752 struct ieee80211com *ic = ni->ni_ic; 753 struct ieee80211_frame *wh; 754 u_int8_t *frm, *efrm; 755 756 wh = mtod(m0, struct ieee80211_frame *); 757 frm = (u_int8_t *)&wh[1]; 758 efrm = mtod(m0, u_int8_t *) + m0->m_len; 759 switch (subtype) { 760 case IEEE80211_FC0_SUBTYPE_ACTION: 761 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 762 if (ni == vap->iv_bss) { 763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 764 wh, NULL, "%s", "unknown node"); 765 vap->iv_stats.is_rx_mgtdiscard++; 766 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 767 /* NB: not interested in multicast frames. */ 768 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 769 wh, NULL, "%s", "not for us"); 770 vap->iv_stats.is_rx_mgtdiscard++; 771 } else if (vap->iv_state != IEEE80211_S_RUN) { 772 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 773 wh, NULL, "wrong state %s", 774 ieee80211_state_name[vap->iv_state]); 775 vap->iv_stats.is_rx_mgtdiscard++; 776 } else { 777 if (ieee80211_parse_action(ni, m0) == 0) 778 (void)ic->ic_recv_action(ni, wh, frm, efrm); 779 } 780 break; 781 782 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 783 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 784 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 785 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 786 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 787 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 788 case IEEE80211_FC0_SUBTYPE_BEACON: 789 case IEEE80211_FC0_SUBTYPE_ATIM: 790 case IEEE80211_FC0_SUBTYPE_DISASSOC: 791 case IEEE80211_FC0_SUBTYPE_AUTH: 792 case IEEE80211_FC0_SUBTYPE_DEAUTH: 793 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 794 wh, NULL, "%s", "not handled"); 795 vap->iv_stats.is_rx_mgtdiscard++; 796 break; 797 798 default: 799 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 800 wh, "mgt", "subtype 0x%x not handled", subtype); 801 vap->iv_stats.is_rx_badsubtype++; 802 break; 803 } 804 } 805