1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifdef __FreeBSD__ 30 __FBSDID("$FreeBSD$"); 31 #endif 32 33 /* 34 * IEEE 802.11 WDS mode support. 35 */ 36 #include "opt_inet.h" 37 #include "opt_wlan.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/endian.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_var.h> 54 #include <net/if_media.h> 55 #include <net/if_llc.h> 56 #include <net/ethernet.h> 57 58 #include <net/bpf.h> 59 60 #include <net80211/ieee80211_var.h> 61 #include <net80211/ieee80211_wds.h> 62 #include <net80211/ieee80211_input.h> 63 #ifdef IEEE80211_SUPPORT_SUPERG 64 #include <net80211/ieee80211_superg.h> 65 #endif 66 67 static void wds_vattach(struct ieee80211vap *); 68 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 70 const struct ieee80211_rx_stats *rxs, int, int); 71 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 72 const struct ieee80211_rx_stats *, int, int); 73 74 void 75 ieee80211_wds_attach(struct ieee80211com *ic) 76 { 77 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 78 } 79 80 void 81 ieee80211_wds_detach(struct ieee80211com *ic) 82 { 83 } 84 85 static void 86 wds_vdetach(struct ieee80211vap *vap) 87 { 88 if (vap->iv_bss != NULL) { 89 /* XXX locking? */ 90 if (vap->iv_bss->ni_wdsvap == vap) 91 vap->iv_bss->ni_wdsvap = NULL; 92 } 93 } 94 95 static void 96 wds_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = wds_newstate; 99 vap->iv_input = wds_input; 100 vap->iv_recv_mgmt = wds_recv_mgmt; 101 vap->iv_opdetach = wds_vdetach; 102 } 103 104 static void 105 wds_flush(struct ieee80211_node *ni) 106 { 107 struct ieee80211com *ic = ni->ni_ic; 108 struct mbuf *m, *next; 109 int8_t rssi, nf; 110 111 m = ieee80211_ageq_remove(&ic->ic_stageq, 112 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 113 if (m == NULL) 114 return; 115 116 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 117 "%s", "flush wds queue"); 118 ic->ic_node_getsignal(ni, &rssi, &nf); 119 for (; m != NULL; m = next) { 120 next = m->m_nextpkt; 121 m->m_nextpkt = NULL; 122 ieee80211_input(ni, m, rssi, nf); 123 } 124 } 125 126 static int 127 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 128 { 129 struct ieee80211com *ic = vap->iv_ic; 130 struct ieee80211_node_table *nt = &ic->ic_sta; 131 struct ieee80211_node *ni, *obss; 132 133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 134 "%s: creating link to %s on channel %u\n", __func__, 135 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 136 137 /* NB: vap create must specify the bssid for the link */ 138 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 139 /* NB: we should only be called on RUN transition */ 140 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 141 142 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 143 /* 144 * Dynamic/non-legacy WDS. Reference the associated 145 * station specified by the desired bssid setup at vap 146 * create. Point ni_wdsvap at the WDS vap so 4-address 147 * frames received through the associated AP vap will 148 * be dispatched upward (e.g. to a bridge) as though 149 * they arrived on the WDS vap. 150 */ 151 IEEE80211_NODE_LOCK(nt); 152 obss = NULL; 153 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 154 if (ni == NULL) { 155 /* 156 * Node went away before we could hookup. This 157 * should be ok; no traffic will flow and a leave 158 * event will be dispatched that should cause 159 * the vap to be destroyed. 160 */ 161 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 162 "%s: station %s went away\n", 163 __func__, ether_sprintf(vap->iv_des_bssid)); 164 /* XXX stat? */ 165 } else if (ni->ni_wdsvap != NULL) { 166 /* 167 * Node already setup with a WDS vap; we cannot 168 * allow multiple references so disallow. If 169 * ni_wdsvap points at us that's ok; we should 170 * do nothing anyway. 171 */ 172 /* XXX printf instead? */ 173 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 174 "%s: station %s in use with %s\n", 175 __func__, ether_sprintf(vap->iv_des_bssid), 176 ni->ni_wdsvap->iv_ifp->if_xname); 177 /* XXX stat? */ 178 } else { 179 /* 180 * Committed to new node, setup state. 181 */ 182 obss = vap->iv_bss; 183 vap->iv_bss = ni; 184 ni->ni_wdsvap = vap; 185 } 186 IEEE80211_NODE_UNLOCK(nt); 187 if (obss != NULL) { 188 /* NB: deferred to avoid recursive lock */ 189 ieee80211_free_node(obss); 190 } 191 } else { 192 /* 193 * Legacy WDS vap setup. 194 */ 195 /* 196 * The far end does not associate so we just create 197 * create a new node and install it as the vap's 198 * bss node. We must simulate an association and 199 * authorize the port for traffic to flow. 200 * XXX check if node already in sta table? 201 */ 202 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 203 if (ni != NULL) { 204 obss = vap->iv_bss; 205 vap->iv_bss = ieee80211_ref_node(ni); 206 ni->ni_flags |= IEEE80211_NODE_AREF; 207 if (obss != NULL) 208 ieee80211_free_node(obss); 209 /* give driver a chance to setup state like ni_txrate */ 210 if (ic->ic_newassoc != NULL) 211 ic->ic_newassoc(ni, 1); 212 /* tell the authenticator about new station */ 213 if (vap->iv_auth->ia_node_join != NULL) 214 vap->iv_auth->ia_node_join(ni); 215 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 216 ieee80211_node_authorize(ni); 217 218 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 219 /* XXX inject l2uf frame */ 220 } 221 } 222 223 /* 224 * Flush any pending frames now that were setup. 225 */ 226 if (ni != NULL) 227 wds_flush(ni); 228 return (ni == NULL ? ENOENT : 0); 229 } 230 231 /* 232 * Propagate multicast frames of an ap vap to all DWDS links. 233 * The caller is assumed to have verified this frame is multicast. 234 */ 235 void 236 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 237 { 238 struct ieee80211com *ic = vap0->iv_ic; 239 const struct ether_header *eh = mtod(m, const struct ether_header *); 240 struct ieee80211_node *ni; 241 struct ieee80211vap *vap; 242 struct ifnet *ifp; 243 struct mbuf *mcopy; 244 int err; 245 246 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 247 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 248 249 /* XXX locking */ 250 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 251 /* only DWDS vaps are interesting */ 252 if (vap->iv_opmode != IEEE80211_M_WDS || 253 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 254 continue; 255 /* if it came in this interface, don't send it back out */ 256 ifp = vap->iv_ifp; 257 if (ifp == m->m_pkthdr.rcvif) 258 continue; 259 /* 260 * Duplicate the frame and send it. 261 */ 262 mcopy = m_copypacket(m, M_NOWAIT); 263 if (mcopy == NULL) { 264 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 265 /* XXX stat + msg */ 266 continue; 267 } 268 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 269 if (ni == NULL) { 270 /* NB: ieee80211_find_txnode does stat+msg */ 271 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 272 m_freem(mcopy); 273 continue; 274 } 275 /* calculate priority so drivers can find the tx queue */ 276 if (ieee80211_classify(ni, mcopy)) { 277 IEEE80211_DISCARD_MAC(vap, 278 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 279 eh->ether_dhost, NULL, 280 "%s", "classification failure"); 281 vap->iv_stats.is_tx_classify++; 282 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 283 m_freem(mcopy); 284 ieee80211_free_node(ni); 285 continue; 286 } 287 288 BPF_MTAP(ifp, m); /* 802.3 tx */ 289 290 /* 291 * Encapsulate the packet in prep for transmission. 292 */ 293 IEEE80211_TX_LOCK(ic); 294 mcopy = ieee80211_encap(vap, ni, mcopy); 295 if (mcopy == NULL) { 296 /* NB: stat+msg handled in ieee80211_encap */ 297 IEEE80211_TX_UNLOCK(ic); 298 ieee80211_free_node(ni); 299 continue; 300 } 301 mcopy->m_flags |= M_MCAST; 302 mcopy->m_pkthdr.rcvif = (void *) ni; 303 304 err = ieee80211_parent_xmitpkt(ic, mcopy); 305 IEEE80211_TX_UNLOCK(ic); 306 if (!err) { 307 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 308 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 309 if_inc_counter(ifp, IFCOUNTER_OBYTES, 310 m->m_pkthdr.len); 311 } 312 } 313 } 314 315 /* 316 * Handle DWDS discovery on receipt of a 4-address frame in 317 * ap mode. Queue the frame and post an event for someone 318 * to plumb the necessary WDS vap for this station. Frames 319 * received prior to the vap set running will then be reprocessed 320 * as if they were just received. 321 */ 322 void 323 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 324 { 325 struct ieee80211com *ic = ni->ni_ic; 326 327 /* 328 * Save the frame with an aging interval 4 times 329 * the listen interval specified by the station. 330 * Frames that sit around too long are reclaimed 331 * using this information. 332 * XXX handle overflow? 333 * XXX per/vap beacon interval? 334 */ 335 m->m_pkthdr.rcvif = (void *)(uintptr_t) 336 ieee80211_mac_hash(ic, ni->ni_macaddr); 337 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 338 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 339 ieee80211_notify_wds_discover(ni); 340 } 341 342 /* 343 * IEEE80211_M_WDS vap state machine handler. 344 */ 345 static int 346 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 347 { 348 struct ieee80211com *ic = vap->iv_ic; 349 enum ieee80211_state ostate; 350 int error; 351 352 IEEE80211_LOCK_ASSERT(ic); 353 354 ostate = vap->iv_state; 355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 356 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 357 vap->iv_state = nstate; /* state transition */ 358 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 359 if (ostate != IEEE80211_S_SCAN) 360 ieee80211_cancel_scan(vap); /* background scan */ 361 error = 0; 362 switch (nstate) { 363 case IEEE80211_S_INIT: 364 switch (ostate) { 365 case IEEE80211_S_SCAN: 366 ieee80211_cancel_scan(vap); 367 break; 368 default: 369 break; 370 } 371 if (ostate != IEEE80211_S_INIT) { 372 /* NB: optimize INIT -> INIT case */ 373 ieee80211_reset_bss(vap); 374 } 375 break; 376 case IEEE80211_S_SCAN: 377 switch (ostate) { 378 case IEEE80211_S_INIT: 379 ieee80211_check_scan_current(vap); 380 break; 381 default: 382 break; 383 } 384 break; 385 case IEEE80211_S_RUN: 386 if (ostate == IEEE80211_S_INIT) { 387 /* 388 * Already have a channel; bypass the scan 389 * and startup immediately. 390 */ 391 error = ieee80211_create_wds(vap, ic->ic_curchan); 392 } 393 break; 394 default: 395 break; 396 } 397 return error; 398 } 399 400 /* 401 * Process a received frame. The node associated with the sender 402 * should be supplied. If nothing was found in the node table then 403 * the caller is assumed to supply a reference to iv_bss instead. 404 * The RSSI and a timestamp are also supplied. The RSSI data is used 405 * during AP scanning to select a AP to associate with; it can have 406 * any units so long as values have consistent units and higher values 407 * mean ``better signal''. The receive timestamp is currently not used 408 * by the 802.11 layer. 409 */ 410 static int 411 wds_input(struct ieee80211_node *ni, struct mbuf *m, 412 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 413 { 414 struct ieee80211vap *vap = ni->ni_vap; 415 struct ieee80211com *ic = ni->ni_ic; 416 struct ifnet *ifp = vap->iv_ifp; 417 struct ieee80211_frame *wh; 418 struct ieee80211_key *key; 419 struct ether_header *eh; 420 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 421 uint8_t dir, type, subtype, qos; 422 int is_hw_decrypted = 0; 423 int has_decrypted = 0; 424 425 /* 426 * Some devices do hardware decryption all the way through 427 * to pretending the frame wasn't encrypted in the first place. 428 * So, tag it appropriately so it isn't discarded inappropriately. 429 */ 430 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 431 is_hw_decrypted = 1; 432 433 if (m->m_flags & M_AMPDU_MPDU) { 434 /* 435 * Fastpath for A-MPDU reorder q resubmission. Frames 436 * w/ M_AMPDU_MPDU marked have already passed through 437 * here but were received out of order and been held on 438 * the reorder queue. When resubmitted they are marked 439 * with the M_AMPDU_MPDU flag and we can bypass most of 440 * the normal processing. 441 */ 442 wh = mtod(m, struct ieee80211_frame *); 443 type = IEEE80211_FC0_TYPE_DATA; 444 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 445 subtype = IEEE80211_FC0_SUBTYPE_QOS; 446 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 447 goto resubmit_ampdu; 448 } 449 450 KASSERT(ni != NULL, ("null node")); 451 452 type = -1; /* undefined */ 453 454 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 455 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 456 ni->ni_macaddr, NULL, 457 "too short (1): len %u", m->m_pkthdr.len); 458 vap->iv_stats.is_rx_tooshort++; 459 goto out; 460 } 461 /* 462 * Bit of a cheat here, we use a pointer for a 3-address 463 * frame format but don't reference fields past outside 464 * ieee80211_frame_min w/o first validating the data is 465 * present. 466 */ 467 wh = mtod(m, struct ieee80211_frame *); 468 469 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 470 ni->ni_inact = ni->ni_inact_reload; 471 472 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 473 IEEE80211_FC0_VERSION_0) { 474 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 475 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 476 wh->i_fc[0], wh->i_fc[1]); 477 vap->iv_stats.is_rx_badversion++; 478 goto err; 479 } 480 481 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 482 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 483 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 484 485 /* NB: WDS vap's do not scan */ 486 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 487 IEEE80211_DISCARD_MAC(vap, 488 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 489 "too short (3): len %u", m->m_pkthdr.len); 490 vap->iv_stats.is_rx_tooshort++; 491 goto out; 492 } 493 /* NB: the TA is implicitly verified by finding the wds peer node */ 494 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 495 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 496 /* not interested in */ 497 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 498 wh->i_addr1, NULL, "%s", "not to bss"); 499 vap->iv_stats.is_rx_wrongbss++; 500 goto out; 501 } 502 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 503 ni->ni_noise = nf; 504 if (IEEE80211_HAS_SEQ(type, subtype)) { 505 uint8_t tid = ieee80211_gettid(wh); 506 if (IEEE80211_QOS_HAS_SEQ(wh) && 507 TID_TO_WME_AC(tid) >= WME_AC_VI) 508 ic->ic_wme.wme_hipri_traffic++; 509 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs)) 510 goto out; 511 } 512 switch (type) { 513 case IEEE80211_FC0_TYPE_DATA: 514 hdrspace = ieee80211_hdrspace(ic, wh); 515 if (m->m_len < hdrspace && 516 (m = m_pullup(m, hdrspace)) == NULL) { 517 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 518 ni->ni_macaddr, NULL, 519 "data too short: expecting %u", hdrspace); 520 vap->iv_stats.is_rx_tooshort++; 521 goto out; /* XXX */ 522 } 523 if (dir != IEEE80211_FC1_DIR_DSTODS) { 524 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 525 wh, "data", "incorrect dir 0x%x", dir); 526 vap->iv_stats.is_rx_wrongdir++; 527 goto out; 528 } 529 /* 530 * Only legacy WDS traffic should take this path. 531 */ 532 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 533 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 534 wh, "data", "%s", "not legacy wds"); 535 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 536 goto out; 537 } 538 /* 539 * Handle A-MPDU re-ordering. If the frame is to be 540 * processed directly then ieee80211_ampdu_reorder 541 * will return 0; otherwise it has consumed the mbuf 542 * and we should do nothing more with it. 543 */ 544 if ((m->m_flags & M_AMPDU) && 545 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 546 m = NULL; 547 goto out; 548 } 549 resubmit_ampdu: 550 551 /* 552 * Handle privacy requirements. Note that we 553 * must not be preempted from here until after 554 * we (potentially) call ieee80211_crypto_demic; 555 * otherwise we may violate assumptions in the 556 * crypto cipher modules used to do delayed update 557 * of replay sequence numbers. 558 */ 559 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 560 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 561 /* 562 * Discard encrypted frames when privacy is off. 563 */ 564 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 565 wh, "WEP", "%s", "PRIVACY off"); 566 vap->iv_stats.is_rx_noprivacy++; 567 IEEE80211_NODE_STAT(ni, rx_noprivacy); 568 goto out; 569 } 570 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 571 /* NB: stats+msgs handled in crypto_decap */ 572 IEEE80211_NODE_STAT(ni, rx_wepfail); 573 goto out; 574 } 575 wh = mtod(m, struct ieee80211_frame *); 576 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 577 has_decrypted = 1; 578 } else { 579 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 580 key = NULL; 581 } 582 583 /* 584 * Save QoS bits for use below--before we strip the header. 585 */ 586 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 587 qos = ieee80211_getqos(wh)[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 (!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 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 661 (is_hw_decrypted == 0) && 662 eh->ether_type != htons(ETHERTYPE_PAE)) { 663 /* 664 * Drop unencrypted frames. 665 */ 666 vap->iv_stats.is_rx_unencrypted++; 667 IEEE80211_NODE_STAT(ni, rx_unencrypted); 668 goto out; 669 } 670 } 671 /* XXX require HT? */ 672 if (qos & IEEE80211_QOS_AMSDU) { 673 m = ieee80211_decap_amsdu(ni, m); 674 if (m == NULL) 675 return IEEE80211_FC0_TYPE_DATA; 676 } else { 677 #ifdef IEEE80211_SUPPORT_SUPERG 678 m = ieee80211_decap_fastframe(vap, ni, m); 679 if (m == NULL) 680 return IEEE80211_FC0_TYPE_DATA; 681 #endif 682 } 683 ieee80211_deliver_data(vap, ni, m); 684 return IEEE80211_FC0_TYPE_DATA; 685 686 case IEEE80211_FC0_TYPE_MGT: 687 vap->iv_stats.is_rx_mgmt++; 688 IEEE80211_NODE_STAT(ni, rx_mgmt); 689 if (dir != IEEE80211_FC1_DIR_NODS) { 690 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 691 wh, "data", "incorrect dir 0x%x", dir); 692 vap->iv_stats.is_rx_wrongdir++; 693 goto err; 694 } 695 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 696 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 697 ni->ni_macaddr, "mgt", "too short: len %u", 698 m->m_pkthdr.len); 699 vap->iv_stats.is_rx_tooshort++; 700 goto out; 701 } 702 #ifdef IEEE80211_DEBUG 703 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 704 if_printf(ifp, "received %s from %s rssi %d\n", 705 ieee80211_mgt_subtype_name(subtype), 706 ether_sprintf(wh->i_addr2), rssi); 707 } 708 #endif 709 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 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, rxs, 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 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 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 } 739 740 static void 741 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 742 const struct ieee80211_rx_stats *rxs, 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_ACTION: 754 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 755 if (ni == vap->iv_bss) { 756 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 757 wh, NULL, "%s", "unknown node"); 758 vap->iv_stats.is_rx_mgtdiscard++; 759 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 760 /* NB: not interested in multicast frames. */ 761 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 762 wh, NULL, "%s", "not for us"); 763 vap->iv_stats.is_rx_mgtdiscard++; 764 } else if (vap->iv_state != IEEE80211_S_RUN) { 765 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 766 wh, NULL, "wrong state %s", 767 ieee80211_state_name[vap->iv_state]); 768 vap->iv_stats.is_rx_mgtdiscard++; 769 } else { 770 if (ieee80211_parse_action(ni, m0) == 0) 771 (void)ic->ic_recv_action(ni, wh, frm, efrm); 772 } 773 break; 774 775 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 776 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 777 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 778 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 779 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 780 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 781 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 782 case IEEE80211_FC0_SUBTYPE_BEACON: 783 case IEEE80211_FC0_SUBTYPE_ATIM: 784 case IEEE80211_FC0_SUBTYPE_DISASSOC: 785 case IEEE80211_FC0_SUBTYPE_AUTH: 786 case IEEE80211_FC0_SUBTYPE_DEAUTH: 787 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 788 wh, NULL, "%s", "not handled"); 789 vap->iv_stats.is_rx_mgtdiscard++; 790 break; 791 792 default: 793 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 794 wh, "mgt", "subtype 0x%x not handled", subtype); 795 vap->iv_stats.is_rx_badsubtype++; 796 break; 797 } 798 } 799