1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 /* 29 * IEEE 802.11 WDS mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 53 #include <net/bpf.h> 54 55 #include <net80211/ieee80211_var.h> 56 #include <net80211/ieee80211_wds.h> 57 #include <net80211/ieee80211_input.h> 58 #ifdef IEEE80211_SUPPORT_SUPERG 59 #include <net80211/ieee80211_superg.h> 60 #endif 61 62 static void wds_vattach(struct ieee80211vap *); 63 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 64 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 65 const struct ieee80211_rx_stats *rxs, int, int); 66 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 67 const struct ieee80211_rx_stats *, int, int); 68 69 void 70 ieee80211_wds_attach(struct ieee80211com *ic) 71 { 72 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 73 } 74 75 void 76 ieee80211_wds_detach(struct ieee80211com *ic) 77 { 78 } 79 80 static void 81 wds_vdetach(struct ieee80211vap *vap) 82 { 83 if (vap->iv_bss != NULL) { 84 /* XXX locking? */ 85 if (vap->iv_bss->ni_wdsvap == vap) 86 vap->iv_bss->ni_wdsvap = NULL; 87 } 88 } 89 90 static void 91 wds_vattach(struct ieee80211vap *vap) 92 { 93 vap->iv_newstate = wds_newstate; 94 vap->iv_input = wds_input; 95 vap->iv_recv_mgmt = wds_recv_mgmt; 96 vap->iv_opdetach = wds_vdetach; 97 } 98 99 static void 100 wds_flush(struct ieee80211_node *ni) 101 { 102 struct ieee80211com *ic = ni->ni_ic; 103 struct mbuf *m, *next; 104 int8_t rssi, nf; 105 106 m = ieee80211_ageq_remove(&ic->ic_stageq, 107 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 108 if (m == NULL) 109 return; 110 111 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 112 "%s", "flush wds queue"); 113 ic->ic_node_getsignal(ni, &rssi, &nf); 114 for (; m != NULL; m = next) { 115 next = m->m_nextpkt; 116 m->m_nextpkt = NULL; 117 ieee80211_input(ni, m, rssi, nf); 118 } 119 } 120 121 static int 122 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 123 { 124 struct ieee80211com *ic = vap->iv_ic; 125 struct ieee80211_node_table *nt = &ic->ic_sta; 126 struct ieee80211_node *ni, *obss; 127 128 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 129 "%s: creating link to %s on channel %u\n", __func__, 130 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 131 132 /* NB: vap create must specify the bssid for the link */ 133 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 134 /* NB: we should only be called on RUN transition */ 135 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 136 137 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 138 /* 139 * Dynamic/non-legacy WDS. Reference the associated 140 * station specified by the desired bssid setup at vap 141 * create. Point ni_wdsvap at the WDS vap so 4-address 142 * frames received through the associated AP vap will 143 * be dispatched upward (e.g. to a bridge) as though 144 * they arrived on the WDS vap. 145 */ 146 IEEE80211_NODE_LOCK(nt); 147 obss = NULL; 148 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 149 if (ni == NULL) { 150 /* 151 * Node went away before we could hookup. This 152 * should be ok; no traffic will flow and a leave 153 * event will be dispatched that should cause 154 * the vap to be destroyed. 155 */ 156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 157 "%s: station %s went away\n", 158 __func__, ether_sprintf(vap->iv_des_bssid)); 159 /* XXX stat? */ 160 } else if (ni->ni_wdsvap != NULL) { 161 /* 162 * Node already setup with a WDS vap; we cannot 163 * allow multiple references so disallow. If 164 * ni_wdsvap points at us that's ok; we should 165 * do nothing anyway. 166 */ 167 /* XXX printf instead? */ 168 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 169 "%s: station %s in use with %s\n", 170 __func__, ether_sprintf(vap->iv_des_bssid), 171 ieee80211_get_vap_ifname(ni->ni_wdsvap)); 172 /* XXX stat? */ 173 } else { 174 /* 175 * Committed to new node, setup state. 176 */ 177 obss = vap->iv_update_bss(vap, ni); 178 ni->ni_wdsvap = vap; 179 } 180 IEEE80211_NODE_UNLOCK(nt); 181 if (obss != NULL) { 182 /* NB: deferred to avoid recursive lock */ 183 ieee80211_free_node(obss); 184 } 185 } else { 186 /* 187 * Legacy WDS vap setup. 188 */ 189 /* 190 * The far end does not associate so we just create 191 * create a new node and install it as the vap's 192 * bss node. We must simulate an association and 193 * authorize the port for traffic to flow. 194 * XXX check if node already in sta table? 195 */ 196 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 197 if (ni != NULL) { 198 obss = vap->iv_update_bss(vap, ieee80211_ref_node(ni)); 199 ni->ni_flags |= IEEE80211_NODE_AREF; 200 if (obss != NULL) 201 ieee80211_free_node(obss); 202 /* give driver a chance to setup state like ni_txrate */ 203 if (ic->ic_newassoc != NULL) 204 ic->ic_newassoc(ni, 1); 205 /* tell the authenticator about new station */ 206 if (vap->iv_auth->ia_node_join != NULL) 207 vap->iv_auth->ia_node_join(ni); 208 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 209 ieee80211_node_authorize(ni); 210 211 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 212 /* XXX inject l2uf frame */ 213 } 214 } 215 216 /* 217 * Flush any pending frames now that were setup. 218 */ 219 if (ni != NULL) 220 wds_flush(ni); 221 return (ni == NULL ? ENOENT : 0); 222 } 223 224 /* 225 * Propagate multicast frames of an ap vap to all DWDS links. 226 * The caller is assumed to have verified this frame is multicast. 227 */ 228 void 229 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 230 { 231 struct ieee80211com *ic = vap0->iv_ic; 232 const struct ether_header *eh = mtod(m, const struct ether_header *); 233 struct ieee80211_node *ni; 234 struct ieee80211vap *vap; 235 struct ifnet *ifp; 236 struct mbuf *mcopy; 237 int err; 238 239 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 240 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 241 242 /* XXX locking */ 243 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 244 /* only DWDS vaps are interesting */ 245 if (vap->iv_opmode != IEEE80211_M_WDS || 246 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 247 continue; 248 /* if it came in this interface, don't send it back out */ 249 ifp = vap->iv_ifp; 250 if (ifp == m->m_pkthdr.rcvif) 251 continue; 252 /* 253 * Duplicate the frame and send it. 254 */ 255 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT); 256 if (mcopy == NULL) { 257 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 258 /* XXX stat + msg */ 259 continue; 260 } 261 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 262 if (ni == NULL) { 263 /* NB: ieee80211_find_txnode does stat+msg */ 264 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 265 m_freem(mcopy); 266 continue; 267 } 268 /* calculate priority so drivers can find the tx queue */ 269 if (ieee80211_classify(ni, mcopy)) { 270 IEEE80211_DISCARD_MAC(vap, 271 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 272 eh->ether_dhost, NULL, 273 "%s", "classification failure"); 274 vap->iv_stats.is_tx_classify++; 275 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 276 m_freem(mcopy); 277 ieee80211_free_node(ni); 278 continue; 279 } 280 281 BPF_MTAP(ifp, m); /* 802.3 tx */ 282 283 /* 284 * Encapsulate the packet in prep for transmission. 285 */ 286 IEEE80211_TX_LOCK(ic); 287 mcopy = ieee80211_encap(vap, ni, mcopy); 288 if (mcopy == NULL) { 289 /* NB: stat+msg handled in ieee80211_encap */ 290 IEEE80211_TX_UNLOCK(ic); 291 ieee80211_free_node(ni); 292 continue; 293 } 294 mcopy->m_flags |= M_MCAST; 295 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 296 mcopy->m_pkthdr.rcvif = (void *) ni; 297 298 err = ieee80211_parent_xmitpkt(ic, mcopy); 299 IEEE80211_TX_UNLOCK(ic); 300 if (!err) { 301 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 302 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 303 if_inc_counter(ifp, IFCOUNTER_OBYTES, 304 m->m_pkthdr.len); 305 } 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 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 330 m->m_pkthdr.rcvif = (void *)(uintptr_t) 331 ieee80211_mac_hash(ic, ni->ni_macaddr); 332 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 333 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 334 ieee80211_notify_wds_discover(ni); 335 } 336 337 /* 338 * IEEE80211_M_WDS vap state machine handler. 339 */ 340 static int 341 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 342 { 343 struct ieee80211com *ic = vap->iv_ic; 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 error = 0; 357 switch (nstate) { 358 case IEEE80211_S_INIT: 359 switch (ostate) { 360 case IEEE80211_S_SCAN: 361 ieee80211_cancel_scan(vap); 362 break; 363 default: 364 break; 365 } 366 if (ostate != IEEE80211_S_INIT) { 367 /* NB: optimize INIT -> INIT case */ 368 ieee80211_reset_bss(vap); 369 } 370 break; 371 case IEEE80211_S_SCAN: 372 switch (ostate) { 373 case IEEE80211_S_INIT: 374 ieee80211_check_scan_current(vap); 375 break; 376 default: 377 break; 378 } 379 break; 380 case IEEE80211_S_RUN: 381 if (ostate == IEEE80211_S_INIT) { 382 /* 383 * Already have a channel; bypass the scan 384 * and startup immediately. 385 */ 386 error = ieee80211_create_wds(vap, ic->ic_curchan); 387 } 388 break; 389 default: 390 break; 391 } 392 return error; 393 } 394 395 /* 396 * Process a received frame. The node associated with the sender 397 * should be supplied. If nothing was found in the node table then 398 * the caller is assumed to supply a reference to iv_bss instead. 399 * The RSSI and a timestamp are also supplied. The RSSI data is used 400 * during AP scanning to select a AP to associate with; it can have 401 * any units so long as values have consistent units and higher values 402 * mean ``better signal''. The receive timestamp is currently not used 403 * by the 802.11 layer. 404 */ 405 static int 406 wds_input(struct ieee80211_node *ni, struct mbuf *m, 407 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 408 { 409 struct ieee80211vap *vap = ni->ni_vap; 410 struct ieee80211com *ic = ni->ni_ic; 411 struct ifnet *ifp = vap->iv_ifp; 412 struct ieee80211_frame *wh; 413 struct ieee80211_key *key; 414 struct ether_header *eh; 415 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 416 uint8_t dir, type, subtype, qos; 417 int is_hw_decrypted = 0; 418 int has_decrypted = 0; 419 420 /* 421 * Some devices do hardware decryption all the way through 422 * to pretending the frame wasn't encrypted in the first place. 423 * So, tag it appropriately so it isn't discarded inappropriately. 424 */ 425 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 426 is_hw_decrypted = 1; 427 428 if (m->m_flags & M_AMPDU_MPDU) { 429 /* 430 * Fastpath for A-MPDU reorder q resubmission. Frames 431 * w/ M_AMPDU_MPDU marked have already passed through 432 * here but were received out of order and been held on 433 * the reorder queue. When resubmitted they are marked 434 * with the M_AMPDU_MPDU flag and we can bypass most of 435 * the normal processing. 436 */ 437 wh = mtod(m, struct ieee80211_frame *); 438 type = IEEE80211_FC0_TYPE_DATA; 439 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 440 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 441 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 442 goto resubmit_ampdu; 443 } 444 445 KASSERT(ni != NULL, ("null node")); 446 447 type = -1; /* undefined */ 448 449 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 450 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 451 ni->ni_macaddr, NULL, 452 "too short (1): len %u", m->m_pkthdr.len); 453 vap->iv_stats.is_rx_tooshort++; 454 goto out; 455 } 456 /* 457 * Bit of a cheat here, we use a pointer for a 3-address 458 * frame format but don't reference fields past outside 459 * ieee80211_frame_min w/o first validating the data is 460 * present. 461 */ 462 wh = mtod(m, struct ieee80211_frame *); 463 464 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 465 ni->ni_inact = ni->ni_inact_reload; 466 467 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) { 468 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 469 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 470 wh->i_fc[0], wh->i_fc[1]); 471 vap->iv_stats.is_rx_badversion++; 472 goto err; 473 } 474 475 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 476 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 477 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 478 479 /* NB: WDS vap's do not scan */ 480 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 481 IEEE80211_DISCARD_MAC(vap, 482 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 483 "too short (3): len %u", m->m_pkthdr.len); 484 vap->iv_stats.is_rx_tooshort++; 485 goto out; 486 } 487 /* NB: the TA is implicitly verified by finding the wds peer node */ 488 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 489 !IEEE80211_ADDR_EQ(wh->i_addr1, 490 ieee80211_vap_get_broadcast_address(vap))) { 491 /* not interested in */ 492 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 493 wh->i_addr1, NULL, "%s", "not to bss"); 494 vap->iv_stats.is_rx_wrongbss++; 495 goto out; 496 } 497 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 498 ni->ni_noise = nf; 499 if (IEEE80211_HAS_SEQ(type, subtype)) { 500 uint8_t tid = ieee80211_gettid(wh); 501 if (IEEE80211_QOS_HAS_SEQ(wh) && 502 TID_TO_WME_AC(tid) >= WME_AC_VI) 503 ic->ic_wme.wme_hipri_traffic++; 504 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs)) 505 goto out; 506 } 507 switch (type) { 508 case IEEE80211_FC0_TYPE_DATA: 509 hdrspace = ieee80211_hdrspace(ic, wh); 510 if (m->m_len < hdrspace && 511 (m = m_pullup(m, hdrspace)) == NULL) { 512 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 513 ni->ni_macaddr, NULL, 514 "data too short: expecting %u", hdrspace); 515 vap->iv_stats.is_rx_tooshort++; 516 goto out; /* XXX */ 517 } 518 if (dir != IEEE80211_FC1_DIR_DSTODS) { 519 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 520 wh, "data", "incorrect dir 0x%x", dir); 521 vap->iv_stats.is_rx_wrongdir++; 522 goto out; 523 } 524 /* 525 * Only legacy WDS traffic should take this path. 526 */ 527 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 528 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 529 wh, "data", "%s", "not legacy wds"); 530 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 531 goto out; 532 } 533 /* 534 * Handle A-MPDU re-ordering. If the frame is to be 535 * processed directly then ieee80211_ampdu_reorder 536 * will return 0; otherwise it has consumed the mbuf 537 * and we should do nothing more with it. 538 */ 539 if ((m->m_flags & M_AMPDU) && 540 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 541 m = NULL; 542 goto out; 543 } 544 resubmit_ampdu: 545 546 /* 547 * Handle privacy requirements. Note that we 548 * must not be preempted from here until after 549 * we (potentially) call ieee80211_crypto_demic; 550 * otherwise we may violate assumptions in the 551 * crypto cipher modules used to do delayed update 552 * of replay sequence numbers. 553 */ 554 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) { 555 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 556 /* 557 * Discard encrypted frames when privacy is off. 558 */ 559 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 560 wh, "WEP", "%s", "PRIVACY off"); 561 vap->iv_stats.is_rx_noprivacy++; 562 IEEE80211_NODE_STAT(ni, rx_noprivacy); 563 goto out; 564 } 565 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 566 /* NB: stats+msgs handled in crypto_decap */ 567 IEEE80211_NODE_STAT(ni, rx_wepfail); 568 goto out; 569 } 570 wh = mtod(m, struct ieee80211_frame *); 571 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 572 has_decrypted = 1; 573 } else { 574 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 575 key = NULL; 576 } 577 578 /* 579 * Save QoS bits for use below--before we strip the header. 580 */ 581 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA) 582 qos = ieee80211_getqos(wh)[0]; 583 else 584 qos = 0; 585 586 /* 587 * Next up, any fragmentation. 588 */ 589 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 590 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 591 if (m == NULL) { 592 /* Fragment dropped or frame not complete yet */ 593 goto out; 594 } 595 } 596 wh = NULL; /* no longer valid, catch any uses */ 597 598 /* 599 * Next strip any MSDU crypto bits. 600 */ 601 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 602 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 603 ni->ni_macaddr, "data", "%s", "demic error"); 604 vap->iv_stats.is_rx_demicfail++; 605 IEEE80211_NODE_STAT(ni, rx_demicfail); 606 goto out; 607 } 608 609 /* copy to listener after decrypt */ 610 if (ieee80211_radiotap_active_vap(vap)) 611 ieee80211_radiotap_rx(vap, m); 612 need_tap = 0; 613 614 /* 615 * Finally, strip the 802.11 header. 616 */ 617 m = ieee80211_decap(vap, m, hdrspace, qos); 618 if (m == NULL) { 619 /* XXX mask bit to check for both */ 620 /* don't count Null data frames as errors */ 621 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 622 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 623 goto out; 624 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 625 ni->ni_macaddr, "data", "%s", "decap error"); 626 vap->iv_stats.is_rx_decap++; 627 IEEE80211_NODE_STAT(ni, rx_decap); 628 goto err; 629 } 630 if (!(qos & IEEE80211_QOS_AMSDU)) 631 eh = mtod(m, struct ether_header *); 632 else 633 eh = NULL; 634 if (!ieee80211_node_is_authorized(ni)) { 635 /* 636 * Deny any non-PAE frames received prior to 637 * authorization. For open/shared-key 638 * authentication the port is mark authorized 639 * after authentication completes. For 802.1x 640 * the port is not marked authorized by the 641 * authenticator until the handshake has completed. 642 */ 643 if (eh == NULL || 644 eh->ether_type != htons(ETHERTYPE_PAE)) { 645 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 646 ni->ni_macaddr, "data", "unauthorized or " 647 "unknown port: ether type 0x%x len %u", 648 eh == NULL ? -1 : eh->ether_type, 649 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 == NULL || 663 eh->ether_type != htons(ETHERTYPE_PAE))) { 664 /* 665 * Drop unencrypted frames. 666 */ 667 vap->iv_stats.is_rx_unencrypted++; 668 IEEE80211_NODE_STAT(ni, rx_unencrypted); 669 goto out; 670 } 671 } 672 /* XXX require HT? */ 673 if (qos & IEEE80211_QOS_AMSDU) { 674 m = ieee80211_decap_amsdu(ni, m); 675 if (m == NULL) 676 return IEEE80211_FC0_TYPE_DATA; 677 } else { 678 #ifdef IEEE80211_SUPPORT_SUPERG 679 m = ieee80211_decap_fastframe(vap, ni, m); 680 if (m == NULL) 681 return IEEE80211_FC0_TYPE_DATA; 682 #endif 683 } 684 ieee80211_deliver_data(vap, ni, m); 685 return IEEE80211_FC0_TYPE_DATA; 686 687 case IEEE80211_FC0_TYPE_MGT: 688 vap->iv_stats.is_rx_mgmt++; 689 IEEE80211_NODE_STAT(ni, rx_mgmt); 690 if (dir != IEEE80211_FC1_DIR_NODS) { 691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 692 wh, "data", "incorrect dir 0x%x", dir); 693 vap->iv_stats.is_rx_wrongdir++; 694 goto err; 695 } 696 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 697 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 698 ni->ni_macaddr, "mgt", "too short: len %u", 699 m->m_pkthdr.len); 700 vap->iv_stats.is_rx_tooshort++; 701 goto out; 702 } 703 #ifdef IEEE80211_DEBUG 704 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 705 net80211_vap_printf(vap, 706 "received %s from %s rssi %d\n", 707 ieee80211_mgt_subtype_name(subtype), 708 ether_sprintf(wh->i_addr2), rssi); 709 } 710 #endif 711 if (IEEE80211_IS_PROTECTED(wh)) { 712 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 713 wh, NULL, "%s", "WEP set but not permitted"); 714 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 715 goto out; 716 } 717 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 718 goto out; 719 720 case IEEE80211_FC0_TYPE_CTL: 721 vap->iv_stats.is_rx_ctl++; 722 IEEE80211_NODE_STAT(ni, rx_ctrl); 723 goto out; 724 725 default: 726 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 727 wh, "bad", "frame type 0x%x", type); 728 /* should not come here */ 729 break; 730 } 731 err: 732 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 733 out: 734 if (m != NULL) { 735 if (need_tap && ieee80211_radiotap_active_vap(vap)) 736 ieee80211_radiotap_rx(vap, m); 737 m_freem(m); 738 } 739 return type; 740 } 741 742 static void 743 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 744 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 745 { 746 struct ieee80211vap *vap = ni->ni_vap; 747 struct ieee80211com *ic = ni->ni_ic; 748 struct ieee80211_frame *wh; 749 u_int8_t *frm, *efrm; 750 751 wh = mtod(m0, struct ieee80211_frame *); 752 frm = (u_int8_t *)&wh[1]; 753 efrm = mtod(m0, u_int8_t *) + m0->m_len; 754 switch (subtype) { 755 case IEEE80211_FC0_SUBTYPE_ACTION: 756 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 757 if (ni == vap->iv_bss) { 758 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 759 wh, NULL, "%s", "unknown node"); 760 vap->iv_stats.is_rx_mgtdiscard++; 761 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 762 /* NB: not interested in multicast frames. */ 763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 764 wh, NULL, "%s", "not for us"); 765 vap->iv_stats.is_rx_mgtdiscard++; 766 } else if (vap->iv_state != IEEE80211_S_RUN) { 767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 768 wh, NULL, "wrong state %s", 769 ieee80211_state_name[vap->iv_state]); 770 vap->iv_stats.is_rx_mgtdiscard++; 771 } else { 772 if (ieee80211_parse_action(ni, m0) == 0) 773 (void)ic->ic_recv_action(ni, wh, frm, efrm); 774 } 775 break; 776 777 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 778 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 779 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 780 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 781 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 782 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 783 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 784 case IEEE80211_FC0_SUBTYPE_BEACON: 785 case IEEE80211_FC0_SUBTYPE_ATIM: 786 case IEEE80211_FC0_SUBTYPE_DISASSOC: 787 case IEEE80211_FC0_SUBTYPE_AUTH: 788 case IEEE80211_FC0_SUBTYPE_DEAUTH: 789 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 790 wh, NULL, "%s", "not handled"); 791 vap->iv_stats.is_rx_mgtdiscard++; 792 break; 793 794 default: 795 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 796 wh, "mgt", "subtype 0x%x not handled", subtype); 797 vap->iv_stats.is_rx_badsubtype++; 798 break; 799 } 800 } 801