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sys/net80211/ieee80211_wds.c
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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 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 303 mcopy->m_pkthdr.rcvif = (void *) ni; 304 305 err = ieee80211_parent_xmitpkt(ic, mcopy); 306 IEEE80211_TX_UNLOCK(ic); 307 if (!err) { 308 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 309 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 310 if_inc_counter(ifp, IFCOUNTER_OBYTES, 311 m->m_pkthdr.len); 312 } 313 } 314 } 315 316 /* 317 * Handle DWDS discovery on receipt of a 4-address frame in 318 * ap mode. Queue the frame and post an event for someone 319 * to plumb the necessary WDS vap for this station. Frames 320 * received prior to the vap set running will then be reprocessed 321 * as if they were just received. 322 */ 323 void 324 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 325 { 326 struct ieee80211com *ic = ni->ni_ic; 327 328 /* 329 * Save the frame with an aging interval 4 times 330 * the listen interval specified by the station. 331 * Frames that sit around too long are reclaimed 332 * using this information. 333 * XXX handle overflow? 334 * XXX per/vap beacon interval? 335 */ 336 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 337 m->m_pkthdr.rcvif = (void *)(uintptr_t) 338 ieee80211_mac_hash(ic, ni->ni_macaddr); 339 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 340 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 341 ieee80211_notify_wds_discover(ni); 342 } 343 344 /* 345 * IEEE80211_M_WDS vap state machine handler. 346 */ 347 static int 348 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 349 { 350 struct ieee80211com *ic = vap->iv_ic; 351 enum ieee80211_state ostate; 352 int error; 353 354 IEEE80211_LOCK_ASSERT(ic); 355 356 ostate = vap->iv_state; 357 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 358 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 359 vap->iv_state = nstate; /* state transition */ 360 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 361 if (ostate != IEEE80211_S_SCAN) 362 ieee80211_cancel_scan(vap); /* background scan */ 363 error = 0; 364 switch (nstate) { 365 case IEEE80211_S_INIT: 366 switch (ostate) { 367 case IEEE80211_S_SCAN: 368 ieee80211_cancel_scan(vap); 369 break; 370 default: 371 break; 372 } 373 if (ostate != IEEE80211_S_INIT) { 374 /* NB: optimize INIT -> INIT case */ 375 ieee80211_reset_bss(vap); 376 } 377 break; 378 case IEEE80211_S_SCAN: 379 switch (ostate) { 380 case IEEE80211_S_INIT: 381 ieee80211_check_scan_current(vap); 382 break; 383 default: 384 break; 385 } 386 break; 387 case IEEE80211_S_RUN: 388 if (ostate == IEEE80211_S_INIT) { 389 /* 390 * Already have a channel; bypass the scan 391 * and startup immediately. 392 */ 393 error = ieee80211_create_wds(vap, ic->ic_curchan); 394 } 395 break; 396 default: 397 break; 398 } 399 return error; 400 } 401 402 /* 403 * Process a received frame. The node associated with the sender 404 * should be supplied. If nothing was found in the node table then 405 * the caller is assumed to supply a reference to iv_bss instead. 406 * The RSSI and a timestamp are also supplied. The RSSI data is used 407 * during AP scanning to select a AP to associate with; it can have 408 * any units so long as values have consistent units and higher values 409 * mean ``better signal''. The receive timestamp is currently not used 410 * by the 802.11 layer. 411 */ 412 static int 413 wds_input(struct ieee80211_node *ni, struct mbuf *m, 414 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 415 { 416 struct ieee80211vap *vap = ni->ni_vap; 417 struct ieee80211com *ic = ni->ni_ic; 418 struct ifnet *ifp = vap->iv_ifp; 419 struct ieee80211_frame *wh; 420 struct ieee80211_key *key; 421 struct ether_header *eh; 422 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 423 uint8_t dir, type, subtype, qos; 424 int is_hw_decrypted = 0; 425 int has_decrypted = 0; 426 427 /* 428 * Some devices do hardware decryption all the way through 429 * to pretending the frame wasn't encrypted in the first place. 430 * So, tag it appropriately so it isn't discarded inappropriately. 431 */ 432 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 433 is_hw_decrypted = 1; 434 435 if (m->m_flags & M_AMPDU_MPDU) { 436 /* 437 * Fastpath for A-MPDU reorder q resubmission. Frames 438 * w/ M_AMPDU_MPDU marked have already passed through 439 * here but were received out of order and been held on 440 * the reorder queue. When resubmitted they are marked 441 * with the M_AMPDU_MPDU flag and we can bypass most of 442 * the normal processing. 443 */ 444 wh = mtod(m, struct ieee80211_frame *); 445 type = IEEE80211_FC0_TYPE_DATA; 446 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 447 subtype = IEEE80211_FC0_SUBTYPE_QOS; 448 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 449 goto resubmit_ampdu; 450 } 451 452 KASSERT(ni != NULL, ("null node")); 453 454 type = -1; /* undefined */ 455 456 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 457 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 458 ni->ni_macaddr, NULL, 459 "too short (1): len %u", m->m_pkthdr.len); 460 vap->iv_stats.is_rx_tooshort++; 461 goto out; 462 } 463 /* 464 * Bit of a cheat here, we use a pointer for a 3-address 465 * frame format but don't reference fields past outside 466 * ieee80211_frame_min w/o first validating the data is 467 * present. 468 */ 469 wh = mtod(m, struct ieee80211_frame *); 470 471 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 472 ni->ni_inact = ni->ni_inact_reload; 473 474 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 475 IEEE80211_FC0_VERSION_0) { 476 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 477 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 478 wh->i_fc[0], wh->i_fc[1]); 479 vap->iv_stats.is_rx_badversion++; 480 goto err; 481 } 482 483 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 484 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 485 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 486 487 /* NB: WDS vap's do not scan */ 488 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 489 IEEE80211_DISCARD_MAC(vap, 490 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 491 "too short (3): len %u", m->m_pkthdr.len); 492 vap->iv_stats.is_rx_tooshort++; 493 goto out; 494 } 495 /* NB: the TA is implicitly verified by finding the wds peer node */ 496 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 497 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 498 /* not interested in */ 499 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 500 wh->i_addr1, NULL, "%s", "not to bss"); 501 vap->iv_stats.is_rx_wrongbss++; 502 goto out; 503 } 504 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 505 ni->ni_noise = nf; 506 if (IEEE80211_HAS_SEQ(type, subtype)) { 507 uint8_t tid = ieee80211_gettid(wh); 508 if (IEEE80211_QOS_HAS_SEQ(wh) && 509 TID_TO_WME_AC(tid) >= WME_AC_VI) 510 ic->ic_wme.wme_hipri_traffic++; 511 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs)) 512 goto out; 513 } 514 switch (type) { 515 case IEEE80211_FC0_TYPE_DATA: 516 hdrspace = ieee80211_hdrspace(ic, wh); 517 if (m->m_len < hdrspace && 518 (m = m_pullup(m, hdrspace)) == NULL) { 519 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 520 ni->ni_macaddr, NULL, 521 "data too short: expecting %u", hdrspace); 522 vap->iv_stats.is_rx_tooshort++; 523 goto out; /* XXX */ 524 } 525 if (dir != IEEE80211_FC1_DIR_DSTODS) { 526 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 527 wh, "data", "incorrect dir 0x%x", dir); 528 vap->iv_stats.is_rx_wrongdir++; 529 goto out; 530 } 531 /* 532 * Only legacy WDS traffic should take this path. 533 */ 534 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 535 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 536 wh, "data", "%s", "not legacy wds"); 537 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 538 goto out; 539 } 540 /* 541 * Handle A-MPDU re-ordering. If the frame is to be 542 * processed directly then ieee80211_ampdu_reorder 543 * will return 0; otherwise it has consumed the mbuf 544 * and we should do nothing more with it. 545 */ 546 if ((m->m_flags & M_AMPDU) && 547 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 548 m = NULL; 549 goto out; 550 } 551 resubmit_ampdu: 552 553 /* 554 * Handle privacy requirements. Note that we 555 * must not be preempted from here until after 556 * we (potentially) call ieee80211_crypto_demic; 557 * otherwise we may violate assumptions in the 558 * crypto cipher modules used to do delayed update 559 * of replay sequence numbers. 560 */ 561 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 562 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 563 /* 564 * Discard encrypted frames when privacy is off. 565 */ 566 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 567 wh, "WEP", "%s", "PRIVACY off"); 568 vap->iv_stats.is_rx_noprivacy++; 569 IEEE80211_NODE_STAT(ni, rx_noprivacy); 570 goto out; 571 } 572 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 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_PROTECTED; 579 has_decrypted = 1; 580 } else { 581 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 582 key = NULL; 583 } 584 585 /* 586 * Save QoS bits for use below--before we strip the header. 587 */ 588 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) 589 qos = ieee80211_getqos(wh)[0]; 590 else 591 qos = 0; 592 593 /* 594 * Next up, any fragmentation. 595 */ 596 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 597 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 598 if (m == NULL) { 599 /* Fragment dropped or frame not complete yet */ 600 goto out; 601 } 602 } 603 wh = NULL; /* no longer valid, catch any uses */ 604 605 /* 606 * Next strip any MSDU crypto bits. 607 */ 608 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 609 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 610 ni->ni_macaddr, "data", "%s", "demic error"); 611 vap->iv_stats.is_rx_demicfail++; 612 IEEE80211_NODE_STAT(ni, rx_demicfail); 613 goto out; 614 } 615 616 /* copy to listener after decrypt */ 617 if (ieee80211_radiotap_active_vap(vap)) 618 ieee80211_radiotap_rx(vap, m); 619 need_tap = 0; 620 621 /* 622 * Finally, strip the 802.11 header. 623 */ 624 m = ieee80211_decap(vap, m, hdrspace, qos); 625 if (m == NULL) { 626 /* XXX mask bit to check for both */ 627 /* don't count Null data frames as errors */ 628 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 629 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 630 goto out; 631 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 632 ni->ni_macaddr, "data", "%s", "decap error"); 633 vap->iv_stats.is_rx_decap++; 634 IEEE80211_NODE_STAT(ni, rx_decap); 635 goto err; 636 } 637 if (!(qos & IEEE80211_QOS_AMSDU)) 638 eh = mtod(m, struct ether_header *); 639 else 640 eh = NULL; 641 if (!ieee80211_node_is_authorized(ni)) { 642 /* 643 * Deny any non-PAE frames received prior to 644 * authorization. For open/shared-key 645 * authentication the port is mark authorized 646 * after authentication completes. For 802.1x 647 * the port is not marked authorized by the 648 * authenticator until the handshake has completed. 649 */ 650 if (eh == NULL || 651 eh->ether_type != htons(ETHERTYPE_PAE)) { 652 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 653 ni->ni_macaddr, "data", "unauthorized or " 654 "unknown port: ether type 0x%x len %u", 655 eh == NULL ? -1 : eh->ether_type, 656 m->m_pkthdr.len); 657 vap->iv_stats.is_rx_unauth++; 658 IEEE80211_NODE_STAT(ni, rx_unauth); 659 goto err; 660 } 661 } else { 662 /* 663 * When denying unencrypted frames, discard 664 * any non-PAE frames received without encryption. 665 */ 666 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 667 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 668 (is_hw_decrypted == 0) && 669 (eh == NULL || 670 eh->ether_type != htons(ETHERTYPE_PAE))) { 671 /* 672 * Drop unencrypted frames. 673 */ 674 vap->iv_stats.is_rx_unencrypted++; 675 IEEE80211_NODE_STAT(ni, rx_unencrypted); 676 goto out; 677 } 678 } 679 /* XXX require HT? */ 680 if (qos & IEEE80211_QOS_AMSDU) { 681 m = ieee80211_decap_amsdu(ni, m); 682 if (m == NULL) 683 return IEEE80211_FC0_TYPE_DATA; 684 } else { 685 #ifdef IEEE80211_SUPPORT_SUPERG 686 m = ieee80211_decap_fastframe(vap, ni, m); 687 if (m == NULL) 688 return IEEE80211_FC0_TYPE_DATA; 689 #endif 690 } 691 ieee80211_deliver_data(vap, ni, m); 692 return IEEE80211_FC0_TYPE_DATA; 693 694 case IEEE80211_FC0_TYPE_MGT: 695 vap->iv_stats.is_rx_mgmt++; 696 IEEE80211_NODE_STAT(ni, rx_mgmt); 697 if (dir != IEEE80211_FC1_DIR_NODS) { 698 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 699 wh, "data", "incorrect dir 0x%x", dir); 700 vap->iv_stats.is_rx_wrongdir++; 701 goto err; 702 } 703 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 704 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 705 ni->ni_macaddr, "mgt", "too short: len %u", 706 m->m_pkthdr.len); 707 vap->iv_stats.is_rx_tooshort++; 708 goto out; 709 } 710 #ifdef IEEE80211_DEBUG 711 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 712 if_printf(ifp, "received %s from %s rssi %d\n", 713 ieee80211_mgt_subtype_name(subtype), 714 ether_sprintf(wh->i_addr2), rssi); 715 } 716 #endif 717 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 718 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 719 wh, NULL, "%s", "WEP set but not permitted"); 720 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 721 goto out; 722 } 723 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 724 goto out; 725 726 case IEEE80211_FC0_TYPE_CTL: 727 vap->iv_stats.is_rx_ctl++; 728 IEEE80211_NODE_STAT(ni, rx_ctrl); 729 goto out; 730 731 default: 732 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 733 wh, "bad", "frame type 0x%x", type); 734 /* should not come here */ 735 break; 736 } 737 err: 738 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 739 out: 740 if (m != NULL) { 741 if (need_tap && ieee80211_radiotap_active_vap(vap)) 742 ieee80211_radiotap_rx(vap, m); 743 m_freem(m); 744 } 745 return type; 746 } 747 748 static void 749 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 750 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 751 { 752 struct ieee80211vap *vap = ni->ni_vap; 753 struct ieee80211com *ic = ni->ni_ic; 754 struct ieee80211_frame *wh; 755 u_int8_t *frm, *efrm; 756 757 wh = mtod(m0, struct ieee80211_frame *); 758 frm = (u_int8_t *)&wh[1]; 759 efrm = mtod(m0, u_int8_t *) + m0->m_len; 760 switch (subtype) { 761 case IEEE80211_FC0_SUBTYPE_ACTION: 762 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 763 if (ni == vap->iv_bss) { 764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 765 wh, NULL, "%s", "unknown node"); 766 vap->iv_stats.is_rx_mgtdiscard++; 767 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 768 /* NB: not interested in multicast frames. */ 769 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 770 wh, NULL, "%s", "not for us"); 771 vap->iv_stats.is_rx_mgtdiscard++; 772 } else if (vap->iv_state != IEEE80211_S_RUN) { 773 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 774 wh, NULL, "wrong state %s", 775 ieee80211_state_name[vap->iv_state]); 776 vap->iv_stats.is_rx_mgtdiscard++; 777 } else { 778 if (ieee80211_parse_action(ni, m0) == 0) 779 (void)ic->ic_recv_action(ni, wh, frm, efrm); 780 } 781 break; 782 783 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 784 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 785 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 786 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 787 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 788 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 789 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 790 case IEEE80211_FC0_SUBTYPE_BEACON: 791 case IEEE80211_FC0_SUBTYPE_ATIM: 792 case IEEE80211_FC0_SUBTYPE_DISASSOC: 793 case IEEE80211_FC0_SUBTYPE_AUTH: 794 case IEEE80211_FC0_SUBTYPE_DEAUTH: 795 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 796 wh, NULL, "%s", "not handled"); 797 vap->iv_stats.is_rx_mgtdiscard++; 798 break; 799 800 default: 801 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 802 wh, "mgt", "subtype 0x%x not handled", subtype); 803 vap->iv_stats.is_rx_badsubtype++; 804 break; 805 } 806 }
Cache object: 80a63de8a039e79fbd07e002afa8aa0f
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