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/if_private.h> 57 #include <net/ethernet.h> 58 59 #include <net/bpf.h> 60 61 #include <net80211/ieee80211_var.h> 62 #include <net80211/ieee80211_wds.h> 63 #include <net80211/ieee80211_input.h> 64 #ifdef IEEE80211_SUPPORT_SUPERG 65 #include <net80211/ieee80211_superg.h> 66 #endif 67 68 static void wds_vattach(struct ieee80211vap *); 69 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 71 const struct ieee80211_rx_stats *rxs, int, int); 72 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 73 const struct ieee80211_rx_stats *, int, int); 74 75 void 76 ieee80211_wds_attach(struct ieee80211com *ic) 77 { 78 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 79 } 80 81 void 82 ieee80211_wds_detach(struct ieee80211com *ic) 83 { 84 } 85 86 static void 87 wds_vdetach(struct ieee80211vap *vap) 88 { 89 if (vap->iv_bss != NULL) { 90 /* XXX locking? */ 91 if (vap->iv_bss->ni_wdsvap == vap) 92 vap->iv_bss->ni_wdsvap = NULL; 93 } 94 } 95 96 static void 97 wds_vattach(struct ieee80211vap *vap) 98 { 99 vap->iv_newstate = wds_newstate; 100 vap->iv_input = wds_input; 101 vap->iv_recv_mgmt = wds_recv_mgmt; 102 vap->iv_opdetach = wds_vdetach; 103 } 104 105 static void 106 wds_flush(struct ieee80211_node *ni) 107 { 108 struct ieee80211com *ic = ni->ni_ic; 109 struct mbuf *m, *next; 110 int8_t rssi, nf; 111 112 m = ieee80211_ageq_remove(&ic->ic_stageq, 113 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 114 if (m == NULL) 115 return; 116 117 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 118 "%s", "flush wds queue"); 119 ic->ic_node_getsignal(ni, &rssi, &nf); 120 for (; m != NULL; m = next) { 121 next = m->m_nextpkt; 122 m->m_nextpkt = NULL; 123 ieee80211_input(ni, m, rssi, nf); 124 } 125 } 126 127 static int 128 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 129 { 130 struct ieee80211com *ic = vap->iv_ic; 131 struct ieee80211_node_table *nt = &ic->ic_sta; 132 struct ieee80211_node *ni, *obss; 133 134 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 135 "%s: creating link to %s on channel %u\n", __func__, 136 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 137 138 /* NB: vap create must specify the bssid for the link */ 139 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 140 /* NB: we should only be called on RUN transition */ 141 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 142 143 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 144 /* 145 * Dynamic/non-legacy WDS. Reference the associated 146 * station specified by the desired bssid setup at vap 147 * create. Point ni_wdsvap at the WDS vap so 4-address 148 * frames received through the associated AP vap will 149 * be dispatched upward (e.g. to a bridge) as though 150 * they arrived on the WDS vap. 151 */ 152 IEEE80211_NODE_LOCK(nt); 153 obss = NULL; 154 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 155 if (ni == NULL) { 156 /* 157 * Node went away before we could hookup. This 158 * should be ok; no traffic will flow and a leave 159 * event will be dispatched that should cause 160 * the vap to be destroyed. 161 */ 162 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 163 "%s: station %s went away\n", 164 __func__, ether_sprintf(vap->iv_des_bssid)); 165 /* XXX stat? */ 166 } else if (ni->ni_wdsvap != NULL) { 167 /* 168 * Node already setup with a WDS vap; we cannot 169 * allow multiple references so disallow. If 170 * ni_wdsvap points at us that's ok; we should 171 * do nothing anyway. 172 */ 173 /* XXX printf instead? */ 174 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 175 "%s: station %s in use with %s\n", 176 __func__, ether_sprintf(vap->iv_des_bssid), 177 ni->ni_wdsvap->iv_ifp->if_xname); 178 /* XXX stat? */ 179 } else { 180 /* 181 * Committed to new node, setup state. 182 */ 183 obss = vap->iv_update_bss(vap, 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_update_bss(vap, ieee80211_ref_node(ni)); 205 ni->ni_flags |= IEEE80211_NODE_AREF; 206 if (obss != NULL) 207 ieee80211_free_node(obss); 208 /* give driver a chance to setup state like ni_txrate */ 209 if (ic->ic_newassoc != NULL) 210 ic->ic_newassoc(ni, 1); 211 /* tell the authenticator about new station */ 212 if (vap->iv_auth->ia_node_join != NULL) 213 vap->iv_auth->ia_node_join(ni); 214 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 215 ieee80211_node_authorize(ni); 216 217 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 218 /* XXX inject l2uf frame */ 219 } 220 } 221 222 /* 223 * Flush any pending frames now that were setup. 224 */ 225 if (ni != NULL) 226 wds_flush(ni); 227 return (ni == NULL ? ENOENT : 0); 228 } 229 230 /* 231 * Propagate multicast frames of an ap vap to all DWDS links. 232 * The caller is assumed to have verified this frame is multicast. 233 */ 234 void 235 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 236 { 237 struct ieee80211com *ic = vap0->iv_ic; 238 const struct ether_header *eh = mtod(m, const struct ether_header *); 239 struct ieee80211_node *ni; 240 struct ieee80211vap *vap; 241 struct ifnet *ifp; 242 struct mbuf *mcopy; 243 int err; 244 245 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 246 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 247 248 /* XXX locking */ 249 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 250 /* only DWDS vaps are interesting */ 251 if (vap->iv_opmode != IEEE80211_M_WDS || 252 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 253 continue; 254 /* if it came in this interface, don't send it back out */ 255 ifp = vap->iv_ifp; 256 if (ifp == m->m_pkthdr.rcvif) 257 continue; 258 /* 259 * Duplicate the frame and send it. 260 */ 261 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT); 262 if (mcopy == NULL) { 263 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 264 /* XXX stat + msg */ 265 continue; 266 } 267 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 268 if (ni == NULL) { 269 /* NB: ieee80211_find_txnode does stat+msg */ 270 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 271 m_freem(mcopy); 272 continue; 273 } 274 /* calculate priority so drivers can find the tx queue */ 275 if (ieee80211_classify(ni, mcopy)) { 276 IEEE80211_DISCARD_MAC(vap, 277 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 278 eh->ether_dhost, NULL, 279 "%s", "classification failure"); 280 vap->iv_stats.is_tx_classify++; 281 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 282 m_freem(mcopy); 283 ieee80211_free_node(ni); 284 continue; 285 } 286 287 BPF_MTAP(ifp, m); /* 802.3 tx */ 288 289 /* 290 * Encapsulate the packet in prep for transmission. 291 */ 292 IEEE80211_TX_LOCK(ic); 293 mcopy = ieee80211_encap(vap, ni, mcopy); 294 if (mcopy == NULL) { 295 /* NB: stat+msg handled in ieee80211_encap */ 296 IEEE80211_TX_UNLOCK(ic); 297 ieee80211_free_node(ni); 298 continue; 299 } 300 mcopy->m_flags |= M_MCAST; 301 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 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 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 336 m->m_pkthdr.rcvif = (void *)(uintptr_t) 337 ieee80211_mac_hash(ic, ni->ni_macaddr); 338 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 339 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 340 ieee80211_notify_wds_discover(ni); 341 } 342 343 /* 344 * IEEE80211_M_WDS vap state machine handler. 345 */ 346 static int 347 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 348 { 349 struct ieee80211com *ic = vap->iv_ic; 350 enum ieee80211_state ostate; 351 int error; 352 353 IEEE80211_LOCK_ASSERT(ic); 354 355 ostate = vap->iv_state; 356 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 357 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 358 vap->iv_state = nstate; /* state transition */ 359 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 360 if (ostate != IEEE80211_S_SCAN) 361 ieee80211_cancel_scan(vap); /* background scan */ 362 error = 0; 363 switch (nstate) { 364 case IEEE80211_S_INIT: 365 switch (ostate) { 366 case IEEE80211_S_SCAN: 367 ieee80211_cancel_scan(vap); 368 break; 369 default: 370 break; 371 } 372 if (ostate != IEEE80211_S_INIT) { 373 /* NB: optimize INIT -> INIT case */ 374 ieee80211_reset_bss(vap); 375 } 376 break; 377 case IEEE80211_S_SCAN: 378 switch (ostate) { 379 case IEEE80211_S_INIT: 380 ieee80211_check_scan_current(vap); 381 break; 382 default: 383 break; 384 } 385 break; 386 case IEEE80211_S_RUN: 387 if (ostate == IEEE80211_S_INIT) { 388 /* 389 * Already have a channel; bypass the scan 390 * and startup immediately. 391 */ 392 error = ieee80211_create_wds(vap, ic->ic_curchan); 393 } 394 break; 395 default: 396 break; 397 } 398 return error; 399 } 400 401 /* 402 * Process a received frame. The node associated with the sender 403 * should be supplied. If nothing was found in the node table then 404 * the caller is assumed to supply a reference to iv_bss instead. 405 * The RSSI and a timestamp are also supplied. The RSSI data is used 406 * during AP scanning to select a AP to associate with; it can have 407 * any units so long as values have consistent units and higher values 408 * mean ``better signal''. The receive timestamp is currently not used 409 * by the 802.11 layer. 410 */ 411 static int 412 wds_input(struct ieee80211_node *ni, struct mbuf *m, 413 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 414 { 415 struct ieee80211vap *vap = ni->ni_vap; 416 struct ieee80211com *ic = ni->ni_ic; 417 struct ifnet *ifp = vap->iv_ifp; 418 struct ieee80211_frame *wh; 419 struct ieee80211_key *key; 420 struct ether_header *eh; 421 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 422 uint8_t dir, type, subtype, qos; 423 int is_hw_decrypted = 0; 424 int has_decrypted = 0; 425 426 /* 427 * Some devices do hardware decryption all the way through 428 * to pretending the frame wasn't encrypted in the first place. 429 * So, tag it appropriately so it isn't discarded inappropriately. 430 */ 431 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 432 is_hw_decrypted = 1; 433 434 if (m->m_flags & M_AMPDU_MPDU) { 435 /* 436 * Fastpath for A-MPDU reorder q resubmission. Frames 437 * w/ M_AMPDU_MPDU marked have already passed through 438 * here but were received out of order and been held on 439 * the reorder queue. When resubmitted they are marked 440 * with the M_AMPDU_MPDU flag and we can bypass most of 441 * the normal processing. 442 */ 443 wh = mtod(m, struct ieee80211_frame *); 444 type = IEEE80211_FC0_TYPE_DATA; 445 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 446 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 447 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 448 goto resubmit_ampdu; 449 } 450 451 KASSERT(ni != NULL, ("null node")); 452 453 type = -1; /* undefined */ 454 455 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 456 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 457 ni->ni_macaddr, NULL, 458 "too short (1): len %u", m->m_pkthdr.len); 459 vap->iv_stats.is_rx_tooshort++; 460 goto out; 461 } 462 /* 463 * Bit of a cheat here, we use a pointer for a 3-address 464 * frame format but don't reference fields past outside 465 * ieee80211_frame_min w/o first validating the data is 466 * present. 467 */ 468 wh = mtod(m, struct ieee80211_frame *); 469 470 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 471 ni->ni_inact = ni->ni_inact_reload; 472 473 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 474 IEEE80211_FC0_VERSION_0) { 475 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 476 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 477 wh->i_fc[0], wh->i_fc[1]); 478 vap->iv_stats.is_rx_badversion++; 479 goto err; 480 } 481 482 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 483 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 484 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 485 486 /* NB: WDS vap's do not scan */ 487 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 488 IEEE80211_DISCARD_MAC(vap, 489 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 490 "too short (3): len %u", m->m_pkthdr.len); 491 vap->iv_stats.is_rx_tooshort++; 492 goto out; 493 } 494 /* NB: the TA is implicitly verified by finding the wds peer node */ 495 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 496 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 497 /* not interested in */ 498 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 499 wh->i_addr1, NULL, "%s", "not to bss"); 500 vap->iv_stats.is_rx_wrongbss++; 501 goto out; 502 } 503 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 504 ni->ni_noise = nf; 505 if (IEEE80211_HAS_SEQ(type, subtype)) { 506 uint8_t tid = ieee80211_gettid(wh); 507 if (IEEE80211_QOS_HAS_SEQ(wh) && 508 TID_TO_WME_AC(tid) >= WME_AC_VI) 509 ic->ic_wme.wme_hipri_traffic++; 510 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs)) 511 goto out; 512 } 513 switch (type) { 514 case IEEE80211_FC0_TYPE_DATA: 515 hdrspace = ieee80211_hdrspace(ic, wh); 516 if (m->m_len < hdrspace && 517 (m = m_pullup(m, hdrspace)) == NULL) { 518 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 519 ni->ni_macaddr, NULL, 520 "data too short: expecting %u", hdrspace); 521 vap->iv_stats.is_rx_tooshort++; 522 goto out; /* XXX */ 523 } 524 if (dir != IEEE80211_FC1_DIR_DSTODS) { 525 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 526 wh, "data", "incorrect dir 0x%x", dir); 527 vap->iv_stats.is_rx_wrongdir++; 528 goto out; 529 } 530 /* 531 * Only legacy WDS traffic should take this path. 532 */ 533 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 534 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 535 wh, "data", "%s", "not legacy wds"); 536 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 537 goto out; 538 } 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, rxs) != 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 (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) { 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 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 572 /* NB: stats+msgs handled in crypto_decap */ 573 IEEE80211_NODE_STAT(ni, rx_wepfail); 574 goto out; 575 } 576 wh = mtod(m, struct ieee80211_frame *); 577 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 578 has_decrypted = 1; 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_DATA) 588 qos = ieee80211_getqos(wh)[0]; 589 else 590 qos = 0; 591 592 /* 593 * Next up, any fragmentation. 594 */ 595 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 596 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 597 if (m == NULL) { 598 /* Fragment dropped or frame not complete yet */ 599 goto out; 600 } 601 } 602 wh = NULL; /* no longer valid, catch any uses */ 603 604 /* 605 * Next strip any MSDU crypto bits. 606 */ 607 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 608 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 609 ni->ni_macaddr, "data", "%s", "demic error"); 610 vap->iv_stats.is_rx_demicfail++; 611 IEEE80211_NODE_STAT(ni, rx_demicfail); 612 goto out; 613 } 614 615 /* copy to listener after decrypt */ 616 if (ieee80211_radiotap_active_vap(vap)) 617 ieee80211_radiotap_rx(vap, m); 618 need_tap = 0; 619 620 /* 621 * Finally, strip the 802.11 header. 622 */ 623 m = ieee80211_decap(vap, m, hdrspace, qos); 624 if (m == NULL) { 625 /* XXX mask bit to check for both */ 626 /* don't count Null data frames as errors */ 627 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 628 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 629 goto out; 630 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 631 ni->ni_macaddr, "data", "%s", "decap error"); 632 vap->iv_stats.is_rx_decap++; 633 IEEE80211_NODE_STAT(ni, rx_decap); 634 goto err; 635 } 636 if (!(qos & IEEE80211_QOS_AMSDU)) 637 eh = mtod(m, struct ether_header *); 638 else 639 eh = NULL; 640 if (!ieee80211_node_is_authorized(ni)) { 641 /* 642 * Deny any non-PAE frames received prior to 643 * authorization. For open/shared-key 644 * authentication the port is mark authorized 645 * after authentication completes. For 802.1x 646 * the port is not marked authorized by the 647 * authenticator until the handshake has completed. 648 */ 649 if (eh == NULL || 650 eh->ether_type != htons(ETHERTYPE_PAE)) { 651 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 652 ni->ni_macaddr, "data", "unauthorized or " 653 "unknown port: ether type 0x%x len %u", 654 eh == NULL ? -1 : eh->ether_type, 655 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 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 667 (is_hw_decrypted == 0) && 668 (eh == NULL || 669 eh->ether_type != htons(ETHERTYPE_PAE))) { 670 /* 671 * Drop unencrypted frames. 672 */ 673 vap->iv_stats.is_rx_unencrypted++; 674 IEEE80211_NODE_STAT(ni, rx_unencrypted); 675 goto out; 676 } 677 } 678 /* XXX require HT? */ 679 if (qos & IEEE80211_QOS_AMSDU) { 680 m = ieee80211_decap_amsdu(ni, m); 681 if (m == NULL) 682 return IEEE80211_FC0_TYPE_DATA; 683 } else { 684 #ifdef IEEE80211_SUPPORT_SUPERG 685 m = ieee80211_decap_fastframe(vap, ni, m); 686 if (m == NULL) 687 return IEEE80211_FC0_TYPE_DATA; 688 #endif 689 } 690 ieee80211_deliver_data(vap, ni, m); 691 return IEEE80211_FC0_TYPE_DATA; 692 693 case IEEE80211_FC0_TYPE_MGT: 694 vap->iv_stats.is_rx_mgmt++; 695 IEEE80211_NODE_STAT(ni, rx_mgmt); 696 if (dir != IEEE80211_FC1_DIR_NODS) { 697 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 698 wh, "data", "incorrect dir 0x%x", dir); 699 vap->iv_stats.is_rx_wrongdir++; 700 goto err; 701 } 702 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 703 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 704 ni->ni_macaddr, "mgt", "too short: len %u", 705 m->m_pkthdr.len); 706 vap->iv_stats.is_rx_tooshort++; 707 goto out; 708 } 709 #ifdef IEEE80211_DEBUG 710 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 711 if_printf(ifp, "received %s from %s rssi %d\n", 712 ieee80211_mgt_subtype_name(subtype), 713 ether_sprintf(wh->i_addr2), rssi); 714 } 715 #endif 716 if (IEEE80211_IS_PROTECTED(wh)) { 717 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 718 wh, NULL, "%s", "WEP set but not permitted"); 719 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 720 goto out; 721 } 722 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 723 goto out; 724 725 case IEEE80211_FC0_TYPE_CTL: 726 vap->iv_stats.is_rx_ctl++; 727 IEEE80211_NODE_STAT(ni, rx_ctrl); 728 goto out; 729 730 default: 731 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 732 wh, "bad", "frame type 0x%x", type); 733 /* should not come here */ 734 break; 735 } 736 err: 737 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 738 out: 739 if (m != NULL) { 740 if (need_tap && ieee80211_radiotap_active_vap(vap)) 741 ieee80211_radiotap_rx(vap, m); 742 m_freem(m); 743 } 744 return type; 745 } 746 747 static void 748 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 749 const struct ieee80211_rx_stats *rxs, 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_TIMING_ADV: 789 case IEEE80211_FC0_SUBTYPE_BEACON: 790 case IEEE80211_FC0_SUBTYPE_ATIM: 791 case IEEE80211_FC0_SUBTYPE_DISASSOC: 792 case IEEE80211_FC0_SUBTYPE_AUTH: 793 case IEEE80211_FC0_SUBTYPE_DEAUTH: 794 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 795 wh, NULL, "%s", "not handled"); 796 vap->iv_stats.is_rx_mgtdiscard++; 797 break; 798 799 default: 800 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 801 wh, "mgt", "subtype 0x%x not handled", subtype); 802 vap->iv_stats.is_rx_badsubtype++; 803 break; 804 } 805 } 806