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/if_private.h> 52#include <net/ethernet.h> 53 54#include <net/bpf.h> 55 56#include <net80211/ieee80211_var.h> 57#include <net80211/ieee80211_wds.h> 58#include <net80211/ieee80211_input.h> 59#ifdef IEEE80211_SUPPORT_SUPERG 60#include <net80211/ieee80211_superg.h> 61#endif 62 63static void wds_vattach(struct ieee80211vap *); 64static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 65static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 66 const struct ieee80211_rx_stats *rxs, int, int); 67static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 68 const struct ieee80211_rx_stats *, int, int); 69 70void 71ieee80211_wds_attach(struct ieee80211com *ic) 72{ 73 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 74} 75 76void 77ieee80211_wds_detach(struct ieee80211com *ic) 78{ 79} 80 81static void 82wds_vdetach(struct ieee80211vap *vap) 83{ 84 if (vap->iv_bss != NULL) { 85 /* XXX locking? */ 86 if (vap->iv_bss->ni_wdsvap == vap) 87 vap->iv_bss->ni_wdsvap = NULL; 88 } 89} 90 91static void 92wds_vattach(struct ieee80211vap *vap) 93{ 94 vap->iv_newstate = wds_newstate; 95 vap->iv_input = wds_input; 96 vap->iv_recv_mgmt = wds_recv_mgmt; 97 vap->iv_opdetach = wds_vdetach; 98} 99 100static void 101wds_flush(struct ieee80211_node *ni) 102{ 103 struct ieee80211com *ic = ni->ni_ic; 104 struct mbuf *m, *next; 105 int8_t rssi, nf; 106 107 m = ieee80211_ageq_remove(&ic->ic_stageq, 108 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 109 if (m == NULL) 110 return; 111 112 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 113 "%s", "flush wds queue"); 114 ic->ic_node_getsignal(ni, &rssi, &nf); 115 for (; m != NULL; m = next) { 116 next = m->m_nextpkt; 117 m->m_nextpkt = NULL; 118 ieee80211_input(ni, m, rssi, nf); 119 } 120} 121 122static int 123ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 124{ 125 struct ieee80211com *ic = vap->iv_ic; 126 struct ieee80211_node_table *nt = &ic->ic_sta; 127 struct ieee80211_node *ni, *obss; 128 129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 130 "%s: creating link to %s on channel %u\n", __func__, 131 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 132 133 /* NB: vap create must specify the bssid for the link */ 134 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 135 /* NB: we should only be called on RUN transition */ 136 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 137 138 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 139 /* 140 * Dynamic/non-legacy WDS. Reference the associated 141 * station specified by the desired bssid setup at vap 142 * create. Point ni_wdsvap at the WDS vap so 4-address 143 * frames received through the associated AP vap will 144 * be dispatched upward (e.g. to a bridge) as though 145 * they arrived on the WDS vap. 146 */ 147 IEEE80211_NODE_LOCK(nt); 148 obss = NULL; 149 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 150 if (ni == NULL) { 151 /* 152 * Node went away before we could hookup. This 153 * should be ok; no traffic will flow and a leave 154 * event will be dispatched that should cause 155 * the vap to be destroyed. 156 */ 157 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 158 "%s: station %s went away\n", 159 __func__, ether_sprintf(vap->iv_des_bssid)); 160 /* XXX stat? */ 161 } else if (ni->ni_wdsvap != NULL) { 162 /* 163 * Node already setup with a WDS vap; we cannot 164 * allow multiple references so disallow. If 165 * ni_wdsvap points at us that's ok; we should 166 * do nothing anyway. 167 */ 168 /* XXX printf instead? */ 169 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 170 "%s: station %s in use with %s\n", 171 __func__, ether_sprintf(vap->iv_des_bssid), 172 ni->ni_wdsvap->iv_ifp->if_xname); 173 /* XXX stat? */ 174 } else { 175 /* 176 * Committed to new node, setup state. 177 */ 178 obss = vap->iv_update_bss(vap, ni); 179 ni->ni_wdsvap = vap; 180 } 181 IEEE80211_NODE_UNLOCK(nt); 182 if (obss != NULL) { 183 /* NB: deferred to avoid recursive lock */ 184 ieee80211_free_node(obss); 185 } 186 } else { 187 /* 188 * Legacy WDS vap setup. 189 */ 190 /* 191 * The far end does not associate so we just create 192 * create a new node and install it as the vap's 193 * bss node. We must simulate an association and 194 * authorize the port for traffic to flow. 195 * XXX check if node already in sta table? 196 */ 197 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 198 if (ni != NULL) { 199 obss = vap->iv_update_bss(vap, ieee80211_ref_node(ni)); 200 ni->ni_flags |= IEEE80211_NODE_AREF; 201 if (obss != NULL) 202 ieee80211_free_node(obss); 203 /* give driver a chance to setup state like ni_txrate */ 204 if (ic->ic_newassoc != NULL) 205 ic->ic_newassoc(ni, 1); 206 /* tell the authenticator about new station */ 207 if (vap->iv_auth->ia_node_join != NULL) 208 vap->iv_auth->ia_node_join(ni); 209 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 210 ieee80211_node_authorize(ni); 211 212 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 213 /* XXX inject l2uf frame */ 214 } 215 } 216 217 /* 218 * Flush any pending frames now that were setup. 219 */ 220 if (ni != NULL) 221 wds_flush(ni); 222 return (ni == NULL ? ENOENT : 0); 223} 224 225/* 226 * Propagate multicast frames of an ap vap to all DWDS links. 227 * The caller is assumed to have verified this frame is multicast. 228 */ 229void 230ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 231{ 232 struct ieee80211com *ic = vap0->iv_ic; 233 const struct ether_header *eh = mtod(m, const struct ether_header *); 234 struct ieee80211_node *ni; 235 struct ieee80211vap *vap; 236 struct ifnet *ifp; 237 struct mbuf *mcopy; 238 int err; 239 240 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 241 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 242 243 /* XXX locking */ 244 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 245 /* only DWDS vaps are interesting */ 246 if (vap->iv_opmode != IEEE80211_M_WDS || 247 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 248 continue; 249 /* if it came in this interface, don't send it back out */ 250 ifp = vap->iv_ifp; 251 if (ifp == m->m_pkthdr.rcvif) 252 continue; 253 /* 254 * Duplicate the frame and send it. 255 */ 256 mcopy = m_copypacket(m, IEEE80211_M_NOWAIT); 257 if (mcopy == NULL) { 258 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 259 /* XXX stat + msg */ 260 continue; 261 } 262 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 263 if (ni == NULL) { 264 /* NB: ieee80211_find_txnode does stat+msg */ 265 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 266 m_freem(mcopy); 267 continue; 268 } 269 /* calculate priority so drivers can find the tx queue */ 270 if (ieee80211_classify(ni, mcopy)) { 271 IEEE80211_DISCARD_MAC(vap, 272 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 273 eh->ether_dhost, NULL, 274 "%s", "classification failure"); 275 vap->iv_stats.is_tx_classify++; 276 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 277 m_freem(mcopy); 278 ieee80211_free_node(ni); 279 continue; 280 } 281 282 BPF_MTAP(ifp, m); /* 802.3 tx */ 283 284 /* 285 * Encapsulate the packet in prep for transmission. 286 */ 287 IEEE80211_TX_LOCK(ic); 288 mcopy = ieee80211_encap(vap, ni, mcopy); 289 if (mcopy == NULL) { 290 /* NB: stat+msg handled in ieee80211_encap */ 291 IEEE80211_TX_UNLOCK(ic); 292 ieee80211_free_node(ni); 293 continue; 294 } 295 mcopy->m_flags |= M_MCAST; 296 MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 297 mcopy->m_pkthdr.rcvif = (void *) ni; 298 299 err = ieee80211_parent_xmitpkt(ic, mcopy); 300 IEEE80211_TX_UNLOCK(ic); 301 if (!err) { 302 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 303 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 304 if_inc_counter(ifp, IFCOUNTER_OBYTES, 305 m->m_pkthdr.len); 306 } 307 } 308} 309 310/* 311 * Handle DWDS discovery on receipt of a 4-address frame in 312 * ap mode. Queue the frame and post an event for someone 313 * to plumb the necessary WDS vap for this station. Frames 314 * received prior to the vap set running will then be reprocessed 315 * as if they were just received. 316 */ 317void 318ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 319{ 320 struct ieee80211com *ic = ni->ni_ic; 321 322 /* 323 * Save the frame with an aging interval 4 times 324 * the listen interval specified by the station. 325 * Frames that sit around too long are reclaimed 326 * using this information. 327 * XXX handle overflow? 328 * XXX per/vap beacon interval? 329 */ 330 MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0); 331 m->m_pkthdr.rcvif = (void *)(uintptr_t) 332 ieee80211_mac_hash(ic, ni->ni_macaddr); 333 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 334 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 335 ieee80211_notify_wds_discover(ni); 336} 337 338/* 339 * IEEE80211_M_WDS vap state machine handler. 340 */ 341static int 342wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 343{ 344 struct ieee80211com *ic = vap->iv_ic; 345 enum ieee80211_state ostate; 346 int error; 347 348 IEEE80211_LOCK_ASSERT(ic); 349 350 ostate = vap->iv_state; 351 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 352 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 353 vap->iv_state = nstate; /* state transition */ 354 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 355 if (ostate != IEEE80211_S_SCAN) 356 ieee80211_cancel_scan(vap); /* background scan */ 357 error = 0; 358 switch (nstate) { 359 case IEEE80211_S_INIT: 360 switch (ostate) { 361 case IEEE80211_S_SCAN: 362 ieee80211_cancel_scan(vap); 363 break; 364 default: 365 break; 366 } 367 if (ostate != IEEE80211_S_INIT) { 368 /* NB: optimize INIT -> INIT case */ 369 ieee80211_reset_bss(vap); 370 } 371 break; 372 case IEEE80211_S_SCAN: 373 switch (ostate) { 374 case IEEE80211_S_INIT: 375 ieee80211_check_scan_current(vap); 376 break; 377 default: 378 break; 379 } 380 break; 381 case IEEE80211_S_RUN: 382 if (ostate == IEEE80211_S_INIT) { 383 /* 384 * Already have a channel; bypass the scan 385 * and startup immediately. 386 */ 387 error = ieee80211_create_wds(vap, ic->ic_curchan); 388 } 389 break; 390 default: 391 break; 392 } 393 return error; 394} 395 396/* 397 * Process a received frame. The node associated with the sender 398 * should be supplied. If nothing was found in the node table then 399 * the caller is assumed to supply a reference to iv_bss instead. 400 * The RSSI and a timestamp are also supplied. The RSSI data is used 401 * during AP scanning to select a AP to associate with; it can have 402 * any units so long as values have consistent units and higher values 403 * mean ``better signal''. The receive timestamp is currently not used 404 * by the 802.11 layer. 405 */ 406static int 407wds_input(struct ieee80211_node *ni, struct mbuf *m, 408 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 409{ 410 struct ieee80211vap *vap = ni->ni_vap; 411 struct ieee80211com *ic = ni->ni_ic; 412 struct ifnet *ifp = vap->iv_ifp; 413 struct ieee80211_frame *wh; 414 struct ieee80211_key *key; 415 struct ether_header *eh; 416 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 417 uint8_t dir, type, subtype, qos; 418 int is_hw_decrypted = 0; 419 int has_decrypted = 0; 420 421 /* 422 * Some devices do hardware decryption all the way through 423 * to pretending the frame wasn't encrypted in the first place. 424 * So, tag it appropriately so it isn't discarded inappropriately. 425 */ 426 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 427 is_hw_decrypted = 1; 428 429 if (m->m_flags & M_AMPDU_MPDU) { 430 /* 431 * Fastpath for A-MPDU reorder q resubmission. Frames 432 * w/ M_AMPDU_MPDU marked have already passed through 433 * here but were received out of order and been held on 434 * the reorder queue. When resubmitted they are marked 435 * with the M_AMPDU_MPDU flag and we can bypass most of 436 * the normal processing. 437 */ 438 wh = mtod(m, struct ieee80211_frame *); 439 type = IEEE80211_FC0_TYPE_DATA; 440 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 441 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 442 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 443 goto resubmit_ampdu; 444 } 445 446 KASSERT(ni != NULL, ("null node")); 447 448 type = -1; /* undefined */ 449 450 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 451 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 452 ni->ni_macaddr, NULL, 453 "too short (1): len %u", m->m_pkthdr.len); 454 vap->iv_stats.is_rx_tooshort++; 455 goto out; 456 } 457 /* 458 * Bit of a cheat here, we use a pointer for a 3-address 459 * frame format but don't reference fields past outside 460 * ieee80211_frame_min w/o first validating the data is 461 * present. 462 */ 463 wh = mtod(m, struct ieee80211_frame *); 464 465 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 466 ni->ni_inact = ni->ni_inact_reload; 467 468 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 469 IEEE80211_FC0_VERSION_0) { 470 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 471 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 472 wh->i_fc[0], wh->i_fc[1]); 473 vap->iv_stats.is_rx_badversion++; 474 goto err; 475 } 476 477 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 478 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 479 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 480 481 /* NB: WDS vap's do not scan */ 482 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 483 IEEE80211_DISCARD_MAC(vap, 484 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 485 "too short (3): len %u", m->m_pkthdr.len); 486 vap->iv_stats.is_rx_tooshort++; 487 goto out; 488 } 489 /* NB: the TA is implicitly verified by finding the wds peer node */ 490 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 491 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 492 /* not interested in */ 493 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 494 wh->i_addr1, NULL, "%s", "not to bss"); 495 vap->iv_stats.is_rx_wrongbss++; 496 goto out; 497 } 498 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 499 ni->ni_noise = nf; 500 if (IEEE80211_HAS_SEQ(type, subtype)) { 501 uint8_t tid = ieee80211_gettid(wh); 502 if (IEEE80211_QOS_HAS_SEQ(wh) && 503 TID_TO_WME_AC(tid) >= WME_AC_VI) 504 ic->ic_wme.wme_hipri_traffic++; 505 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs)) 506 goto out; 507 } 508 switch (type) { 509 case IEEE80211_FC0_TYPE_DATA: 510 hdrspace = ieee80211_hdrspace(ic, wh); 511 if (m->m_len < hdrspace && 512 (m = m_pullup(m, hdrspace)) == NULL) { 513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 514 ni->ni_macaddr, NULL, 515 "data too short: expecting %u", hdrspace); 516 vap->iv_stats.is_rx_tooshort++; 517 goto out; /* XXX */ 518 } 519 if (dir != IEEE80211_FC1_DIR_DSTODS) { 520 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 521 wh, "data", "incorrect dir 0x%x", dir); 522 vap->iv_stats.is_rx_wrongdir++; 523 goto out; 524 } 525 /* 526 * Only legacy WDS traffic should take this path. 527 */ 528 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 529 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 530 wh, "data", "%s", "not legacy wds"); 531 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 532 goto out; 533 } 534 /* 535 * Handle A-MPDU re-ordering. If the frame is to be 536 * processed directly then ieee80211_ampdu_reorder 537 * will return 0; otherwise it has consumed the mbuf 538 * and we should do nothing more with it. 539 */ 540 if ((m->m_flags & M_AMPDU) && 541 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 542 m = NULL; 543 goto out; 544 } 545 resubmit_ampdu: 546 547 /* 548 * Handle privacy requirements. Note that we 549 * must not be preempted from here until after 550 * we (potentially) call ieee80211_crypto_demic; 551 * otherwise we may violate assumptions in the 552 * crypto cipher modules used to do delayed update 553 * of replay sequence numbers. 554 */ 555 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) { 556 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 557 /* 558 * Discard encrypted frames when privacy is off. 559 */ 560 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 561 wh, "WEP", "%s", "PRIVACY off"); 562 vap->iv_stats.is_rx_noprivacy++; 563 IEEE80211_NODE_STAT(ni, rx_noprivacy); 564 goto out; 565 } 566 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 567 /* NB: stats+msgs handled in crypto_decap */ 568 IEEE80211_NODE_STAT(ni, rx_wepfail); 569 goto out; 570 } 571 wh = mtod(m, struct ieee80211_frame *); 572 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 573 has_decrypted = 1; 574 } else { 575 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 576 key = NULL; 577 } 578 579 /* 580 * Save QoS bits for use below--before we strip the header. 581 */ 582 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA) 583 qos = ieee80211_getqos(wh)[0]; 584 else 585 qos = 0; 586 587 /* 588 * Next up, any fragmentation. 589 */ 590 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 591 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 592 if (m == NULL) { 593 /* Fragment dropped or frame not complete yet */ 594 goto out; 595 } 596 } 597 wh = NULL; /* no longer valid, catch any uses */ 598 599 /* 600 * Next strip any MSDU crypto bits. 601 */ 602 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 604 ni->ni_macaddr, "data", "%s", "demic error"); 605 vap->iv_stats.is_rx_demicfail++; 606 IEEE80211_NODE_STAT(ni, rx_demicfail); 607 goto out; 608 } 609 610 /* copy to listener after decrypt */ 611 if (ieee80211_radiotap_active_vap(vap)) 612 ieee80211_radiotap_rx(vap, m); 613 need_tap = 0; 614 615 /* 616 * Finally, strip the 802.11 header. 617 */ 618 m = ieee80211_decap(vap, m, hdrspace, qos); 619 if (m == NULL) { 620 /* XXX mask bit to check for both */ 621 /* don't count Null data frames as errors */ 622 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 623 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 624 goto out; 625 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 626 ni->ni_macaddr, "data", "%s", "decap error"); 627 vap->iv_stats.is_rx_decap++; 628 IEEE80211_NODE_STAT(ni, rx_decap); 629 goto err; 630 } 631 if (!(qos & IEEE80211_QOS_AMSDU)) 632 eh = mtod(m, struct ether_header *); 633 else 634 eh = NULL; 635 if (!ieee80211_node_is_authorized(ni)) { 636 /* 637 * Deny any non-PAE frames received prior to 638 * authorization. For open/shared-key 639 * authentication the port is mark authorized 640 * after authentication completes. For 802.1x 641 * the port is not marked authorized by the 642 * authenticator until the handshake has completed. 643 */ 644 if (eh == NULL || 645 eh->ether_type != htons(ETHERTYPE_PAE)) { 646 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 647 ni->ni_macaddr, "data", "unauthorized or " 648 "unknown port: ether type 0x%x len %u", 649 eh == NULL ? -1 : eh->ether_type, 650 m->m_pkthdr.len); 651 vap->iv_stats.is_rx_unauth++; 652 IEEE80211_NODE_STAT(ni, rx_unauth); 653 goto err; 654 } 655 } else { 656 /* 657 * When denying unencrypted frames, discard 658 * any non-PAE frames received without encryption. 659 */ 660 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 661 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 662 (is_hw_decrypted == 0) && 663 (eh == NULL || 664 eh->ether_type != htons(ETHERTYPE_PAE))) { 665 /* 666 * Drop unencrypted frames. 667 */ 668 vap->iv_stats.is_rx_unencrypted++; 669 IEEE80211_NODE_STAT(ni, rx_unencrypted); 670 goto out; 671 } 672 } 673 /* XXX require HT? */ 674 if (qos & IEEE80211_QOS_AMSDU) { 675 m = ieee80211_decap_amsdu(ni, m); 676 if (m == NULL) 677 return IEEE80211_FC0_TYPE_DATA; 678 } else { 679#ifdef IEEE80211_SUPPORT_SUPERG 680 m = ieee80211_decap_fastframe(vap, ni, m); 681 if (m == NULL) 682 return IEEE80211_FC0_TYPE_DATA; 683#endif 684 } 685 ieee80211_deliver_data(vap, ni, m); 686 return IEEE80211_FC0_TYPE_DATA; 687 688 case IEEE80211_FC0_TYPE_MGT: 689 vap->iv_stats.is_rx_mgmt++; 690 IEEE80211_NODE_STAT(ni, rx_mgmt); 691 if (dir != IEEE80211_FC1_DIR_NODS) { 692 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 693 wh, "data", "incorrect dir 0x%x", dir); 694 vap->iv_stats.is_rx_wrongdir++; 695 goto err; 696 } 697 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 698 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 699 ni->ni_macaddr, "mgt", "too short: len %u", 700 m->m_pkthdr.len); 701 vap->iv_stats.is_rx_tooshort++; 702 goto out; 703 } 704#ifdef IEEE80211_DEBUG 705 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 706 if_printf(ifp, "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 } 731err: 732 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 733out: 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 742static void 743wds_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