ieee80211_wds.c revision 295795
1/*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27#ifdef __FreeBSD__ 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_wds.c 295795 2016-02-19 05:59:38Z avos $"); 29#endif 30 31/* 32 * IEEE 802.11 WDS mode support. 33 */ 34#include "opt_inet.h" 35#include "opt_wlan.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/mbuf.h> 40#include <sys/malloc.h> 41#include <sys/kernel.h> 42 43#include <sys/socket.h> 44#include <sys/sockio.h> 45#include <sys/endian.h> 46#include <sys/errno.h> 47#include <sys/proc.h> 48#include <sys/sysctl.h> 49 50#include <net/if.h> 51#include <net/if_var.h> 52#include <net/if_media.h> 53#include <net/if_llc.h> 54#include <net/ethernet.h> 55 56#include <net/bpf.h> 57 58#include <net80211/ieee80211_var.h> 59#include <net80211/ieee80211_wds.h> 60#include <net80211/ieee80211_input.h> 61#ifdef IEEE80211_SUPPORT_SUPERG 62#include <net80211/ieee80211_superg.h> 63#endif 64 65static void wds_vattach(struct ieee80211vap *); 66static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 67static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 68 const struct ieee80211_rx_stats *rxs, int, int); 69static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 70 const struct ieee80211_rx_stats *, int, int); 71 72void 73ieee80211_wds_attach(struct ieee80211com *ic) 74{ 75 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 76} 77 78void 79ieee80211_wds_detach(struct ieee80211com *ic) 80{ 81} 82 83static void 84wds_vdetach(struct ieee80211vap *vap) 85{ 86 if (vap->iv_bss != NULL) { 87 /* XXX locking? */ 88 if (vap->iv_bss->ni_wdsvap == vap) 89 vap->iv_bss->ni_wdsvap = NULL; 90 } 91} 92 93static void 94wds_vattach(struct ieee80211vap *vap) 95{ 96 vap->iv_newstate = wds_newstate; 97 vap->iv_input = wds_input; 98 vap->iv_recv_mgmt = wds_recv_mgmt; 99 vap->iv_opdetach = wds_vdetach; 100} 101 102static void 103wds_flush(struct ieee80211_node *ni) 104{ 105 struct ieee80211com *ic = ni->ni_ic; 106 struct mbuf *m, *next; 107 int8_t rssi, nf; 108 109 m = ieee80211_ageq_remove(&ic->ic_stageq, 110 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 111 if (m == NULL) 112 return; 113 114 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 115 "%s", "flush wds queue"); 116 ic->ic_node_getsignal(ni, &rssi, &nf); 117 for (; m != NULL; m = next) { 118 next = m->m_nextpkt; 119 m->m_nextpkt = NULL; 120 ieee80211_input(ni, m, rssi, nf); 121 } 122} 123 124static int 125ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 126{ 127 struct ieee80211com *ic = vap->iv_ic; 128 struct ieee80211_node_table *nt = &ic->ic_sta; 129 struct ieee80211_node *ni, *obss; 130 131 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 132 "%s: creating link to %s on channel %u\n", __func__, 133 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 134 135 /* NB: vap create must specify the bssid for the link */ 136 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 137 /* NB: we should only be called on RUN transition */ 138 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 139 140 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 141 /* 142 * Dynamic/non-legacy WDS. Reference the associated 143 * station specified by the desired bssid setup at vap 144 * create. Point ni_wdsvap at the WDS vap so 4-address 145 * frames received through the associated AP vap will 146 * be dispatched upward (e.g. to a bridge) as though 147 * they arrived on the WDS vap. 148 */ 149 IEEE80211_NODE_LOCK(nt); 150 obss = NULL; 151 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 152 if (ni == NULL) { 153 /* 154 * Node went away before we could hookup. This 155 * should be ok; no traffic will flow and a leave 156 * event will be dispatched that should cause 157 * the vap to be destroyed. 158 */ 159 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 160 "%s: station %s went away\n", 161 __func__, ether_sprintf(vap->iv_des_bssid)); 162 /* XXX stat? */ 163 } else if (ni->ni_wdsvap != NULL) { 164 /* 165 * Node already setup with a WDS vap; we cannot 166 * allow multiple references so disallow. If 167 * ni_wdsvap points at us that's ok; we should 168 * do nothing anyway. 169 */ 170 /* XXX printf instead? */ 171 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 172 "%s: station %s in use with %s\n", 173 __func__, ether_sprintf(vap->iv_des_bssid), 174 ni->ni_wdsvap->iv_ifp->if_xname); 175 /* XXX stat? */ 176 } else { 177 /* 178 * Committed to new node, setup state. 179 */ 180 obss = vap->iv_bss; 181 vap->iv_bss = ni; 182 ni->ni_wdsvap = vap; 183 } 184 IEEE80211_NODE_UNLOCK(nt); 185 if (obss != NULL) { 186 /* NB: deferred to avoid recursive lock */ 187 ieee80211_free_node(obss); 188 } 189 } else { 190 /* 191 * Legacy WDS vap setup. 192 */ 193 /* 194 * The far end does not associate so we just create 195 * create a new node and install it as the vap's 196 * bss node. We must simulate an association and 197 * authorize the port for traffic to flow. 198 * XXX check if node already in sta table? 199 */ 200 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 201 if (ni != NULL) { 202 obss = vap->iv_bss; 203 vap->iv_bss = ieee80211_ref_node(ni); 204 ni->ni_flags |= IEEE80211_NODE_AREF; 205 if (obss != NULL) 206 ieee80211_free_node(obss); 207 /* give driver a chance to setup state like ni_txrate */ 208 if (ic->ic_newassoc != NULL) 209 ic->ic_newassoc(ni, 1); 210 /* tell the authenticator about new station */ 211 if (vap->iv_auth->ia_node_join != NULL) 212 vap->iv_auth->ia_node_join(ni); 213 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 214 ieee80211_node_authorize(ni); 215 216 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 217 /* XXX inject l2uf frame */ 218 } 219 } 220 221 /* 222 * Flush any pending frames now that were setup. 223 */ 224 if (ni != NULL) 225 wds_flush(ni); 226 return (ni == NULL ? ENOENT : 0); 227} 228 229/* 230 * Propagate multicast frames of an ap vap to all DWDS links. 231 * The caller is assumed to have verified this frame is multicast. 232 */ 233void 234ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 235{ 236 struct ieee80211com *ic = vap0->iv_ic; 237 const struct ether_header *eh = mtod(m, const struct ether_header *); 238 struct ieee80211_node *ni; 239 struct ieee80211vap *vap; 240 struct ifnet *ifp; 241 struct mbuf *mcopy; 242 int err; 243 244 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 245 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 246 247 /* XXX locking */ 248 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 249 /* only DWDS vaps are interesting */ 250 if (vap->iv_opmode != IEEE80211_M_WDS || 251 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 252 continue; 253 /* if it came in this interface, don't send it back out */ 254 ifp = vap->iv_ifp; 255 if (ifp == m->m_pkthdr.rcvif) 256 continue; 257 /* 258 * Duplicate the frame and send it. 259 */ 260 mcopy = m_copypacket(m, M_NOWAIT); 261 if (mcopy == NULL) { 262 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 263 /* XXX stat + msg */ 264 continue; 265 } 266 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 267 if (ni == NULL) { 268 /* NB: ieee80211_find_txnode does stat+msg */ 269 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 270 m_freem(mcopy); 271 continue; 272 } 273 /* calculate priority so drivers can find the tx queue */ 274 if (ieee80211_classify(ni, mcopy)) { 275 IEEE80211_DISCARD_MAC(vap, 276 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 277 eh->ether_dhost, NULL, 278 "%s", "classification failure"); 279 vap->iv_stats.is_tx_classify++; 280 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 281 m_freem(mcopy); 282 ieee80211_free_node(ni); 283 continue; 284 } 285 286 BPF_MTAP(ifp, m); /* 802.3 tx */ 287 288 /* 289 * Encapsulate the packet in prep for transmission. 290 */ 291 mcopy = ieee80211_encap(vap, ni, mcopy); 292 if (mcopy == NULL) { 293 /* NB: stat+msg handled in ieee80211_encap */ 294 ieee80211_free_node(ni); 295 continue; 296 } 297 mcopy->m_flags |= M_MCAST; 298 mcopy->m_pkthdr.rcvif = (void *) ni; 299 300 err = ieee80211_parent_xmitpkt(ic, mcopy); 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 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 */ 340static int 341wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 342{ 343 struct ieee80211com *ic = vap->iv_ic; 344 struct ieee80211_node *ni; 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 ni = vap->iv_bss; /* NB: no reference held */ 358 error = 0; 359 switch (nstate) { 360 case IEEE80211_S_INIT: 361 switch (ostate) { 362 case IEEE80211_S_SCAN: 363 ieee80211_cancel_scan(vap); 364 break; 365 default: 366 break; 367 } 368 if (ostate != IEEE80211_S_INIT) { 369 /* NB: optimize INIT -> INIT case */ 370 ieee80211_reset_bss(vap); 371 } 372 break; 373 case IEEE80211_S_SCAN: 374 switch (ostate) { 375 case IEEE80211_S_INIT: 376 ieee80211_check_scan_current(vap); 377 break; 378 default: 379 break; 380 } 381 break; 382 case IEEE80211_S_RUN: 383 if (ostate == IEEE80211_S_INIT) { 384 /* 385 * Already have a channel; bypass the scan 386 * and startup immediately. 387 */ 388 error = ieee80211_create_wds(vap, ic->ic_curchan); 389 } 390 break; 391 default: 392 break; 393 } 394 return error; 395} 396 397/* 398 * Process a received frame. The node associated with the sender 399 * should be supplied. If nothing was found in the node table then 400 * the caller is assumed to supply a reference to iv_bss instead. 401 * The RSSI and a timestamp are also supplied. The RSSI data is used 402 * during AP scanning to select a AP to associate with; it can have 403 * any units so long as values have consistent units and higher values 404 * mean ``better signal''. The receive timestamp is currently not used 405 * by the 802.11 layer. 406 */ 407static int 408wds_input(struct ieee80211_node *ni, struct mbuf *m, 409 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 410{ 411 struct ieee80211vap *vap = ni->ni_vap; 412 struct ieee80211com *ic = ni->ni_ic; 413 struct ifnet *ifp = vap->iv_ifp; 414 struct ieee80211_frame *wh; 415 struct ieee80211_key *key; 416 struct ether_header *eh; 417 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 418 uint8_t dir, type, subtype, qos; 419 uint16_t rxseq; 420 421 if (m->m_flags & M_AMPDU_MPDU) { 422 /* 423 * Fastpath for A-MPDU reorder q resubmission. Frames 424 * w/ M_AMPDU_MPDU marked have already passed through 425 * here but were received out of order and been held on 426 * the reorder queue. When resubmitted they are marked 427 * with the M_AMPDU_MPDU flag and we can bypass most of 428 * the normal processing. 429 */ 430 wh = mtod(m, struct ieee80211_frame *); 431 type = IEEE80211_FC0_TYPE_DATA; 432 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 433 subtype = IEEE80211_FC0_SUBTYPE_QOS; 434 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 435 goto resubmit_ampdu; 436 } 437 438 KASSERT(ni != NULL, ("null node")); 439 440 type = -1; /* undefined */ 441 442 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 443 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 444 ni->ni_macaddr, NULL, 445 "too short (1): len %u", m->m_pkthdr.len); 446 vap->iv_stats.is_rx_tooshort++; 447 goto out; 448 } 449 /* 450 * Bit of a cheat here, we use a pointer for a 3-address 451 * frame format but don't reference fields past outside 452 * ieee80211_frame_min w/o first validating the data is 453 * present. 454 */ 455 wh = mtod(m, struct ieee80211_frame *); 456 457 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 458 ni->ni_inact = ni->ni_inact_reload; 459 460 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 461 IEEE80211_FC0_VERSION_0) { 462 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 463 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 464 wh->i_fc[0], wh->i_fc[1]); 465 vap->iv_stats.is_rx_badversion++; 466 goto err; 467 } 468 469 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 470 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 471 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 472 473 /* NB: WDS vap's do not scan */ 474 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 475 IEEE80211_DISCARD_MAC(vap, 476 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 477 "too short (3): len %u", m->m_pkthdr.len); 478 vap->iv_stats.is_rx_tooshort++; 479 goto out; 480 } 481 /* NB: the TA is implicitly verified by finding the wds peer node */ 482 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 483 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 484 /* not interested in */ 485 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 486 wh->i_addr1, NULL, "%s", "not to bss"); 487 vap->iv_stats.is_rx_wrongbss++; 488 goto out; 489 } 490 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 491 ni->ni_noise = nf; 492 if (IEEE80211_HAS_SEQ(type, subtype)) { 493 uint8_t tid = ieee80211_gettid(wh); 494 if (IEEE80211_QOS_HAS_SEQ(wh) && 495 TID_TO_WME_AC(tid) >= WME_AC_VI) 496 ic->ic_wme.wme_hipri_traffic++; 497 rxseq = le16toh(*(uint16_t *)wh->i_seq); 498 if (! ieee80211_check_rxseq(ni, wh)) { 499 /* duplicate, discard */ 500 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 501 wh->i_addr1, "duplicate", 502 "seqno <%u,%u> fragno <%u,%u> tid %u", 503 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 504 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 505 rxseq & IEEE80211_SEQ_FRAG_MASK, 506 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 507 tid); 508 vap->iv_stats.is_rx_dup++; 509 IEEE80211_NODE_STAT(ni, rx_dup); 510 goto out; 511 } 512 ni->ni_rxseqs[tid] = rxseq; 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) != 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 (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 key = ieee80211_crypto_decap(ni, m, hdrspace); 573 if (key == NULL) { 574 /* NB: stats+msgs handled in crypto_decap */ 575 IEEE80211_NODE_STAT(ni, rx_wepfail); 576 goto out; 577 } 578 wh = mtod(m, struct ieee80211_frame *); 579 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 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 = (dir == IEEE80211_FC1_DIR_DSTODS) ? 590 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 591 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 592 } else 593 qos = 0; 594 595 /* 596 * Next up, any fragmentation. 597 */ 598 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 599 m = ieee80211_defrag(ni, m, hdrspace); 600 if (m == NULL) { 601 /* Fragment dropped or frame not complete yet */ 602 goto out; 603 } 604 } 605 wh = NULL; /* no longer valid, catch any uses */ 606 607 /* 608 * Next strip any MSDU crypto bits. 609 */ 610 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 611 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 612 ni->ni_macaddr, "data", "%s", "demic error"); 613 vap->iv_stats.is_rx_demicfail++; 614 IEEE80211_NODE_STAT(ni, rx_demicfail); 615 goto out; 616 } 617 618 /* copy to listener after decrypt */ 619 if (ieee80211_radiotap_active_vap(vap)) 620 ieee80211_radiotap_rx(vap, m); 621 need_tap = 0; 622 623 /* 624 * Finally, strip the 802.11 header. 625 */ 626 m = ieee80211_decap(vap, m, hdrspace); 627 if (m == NULL) { 628 /* XXX mask bit to check for both */ 629 /* don't count Null data frames as errors */ 630 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 631 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 632 goto out; 633 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 634 ni->ni_macaddr, "data", "%s", "decap error"); 635 vap->iv_stats.is_rx_decap++; 636 IEEE80211_NODE_STAT(ni, rx_decap); 637 goto err; 638 } 639 eh = mtod(m, struct ether_header *); 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->ether_type != htons(ETHERTYPE_PAE)) { 650 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 651 eh->ether_shost, "data", 652 "unauthorized port: ether type 0x%x len %u", 653 eh->ether_type, m->m_pkthdr.len); 654 vap->iv_stats.is_rx_unauth++; 655 IEEE80211_NODE_STAT(ni, rx_unauth); 656 goto err; 657 } 658 } else { 659 /* 660 * When denying unencrypted frames, discard 661 * any non-PAE frames received without encryption. 662 */ 663 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 664 (key == NULL && (m->m_flags & M_WEP) == 0) && 665 eh->ether_type != htons(ETHERTYPE_PAE)) { 666 /* 667 * Drop unencrypted frames. 668 */ 669 vap->iv_stats.is_rx_unencrypted++; 670 IEEE80211_NODE_STAT(ni, rx_unencrypted); 671 goto out; 672 } 673 } 674 /* XXX require HT? */ 675 if (qos & IEEE80211_QOS_AMSDU) { 676 m = ieee80211_decap_amsdu(ni, m); 677 if (m == NULL) 678 return IEEE80211_FC0_TYPE_DATA; 679 } else { 680#ifdef IEEE80211_SUPPORT_SUPERG 681 m = ieee80211_decap_fastframe(vap, ni, m); 682 if (m == NULL) 683 return IEEE80211_FC0_TYPE_DATA; 684#endif 685 } 686 ieee80211_deliver_data(vap, ni, m); 687 return IEEE80211_FC0_TYPE_DATA; 688 689 case IEEE80211_FC0_TYPE_MGT: 690 vap->iv_stats.is_rx_mgmt++; 691 IEEE80211_NODE_STAT(ni, rx_mgmt); 692 if (dir != IEEE80211_FC1_DIR_NODS) { 693 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 694 wh, "data", "incorrect dir 0x%x", dir); 695 vap->iv_stats.is_rx_wrongdir++; 696 goto err; 697 } 698 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 699 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 700 ni->ni_macaddr, "mgt", "too short: len %u", 701 m->m_pkthdr.len); 702 vap->iv_stats.is_rx_tooshort++; 703 goto out; 704 } 705#ifdef IEEE80211_DEBUG 706 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 707 if_printf(ifp, "received %s from %s rssi %d\n", 708 ieee80211_mgt_subtype_name[subtype >> 709 IEEE80211_FC0_SUBTYPE_SHIFT], 710 ether_sprintf(wh->i_addr2), rssi); 711 } 712#endif 713 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 714 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 715 wh, NULL, "%s", "WEP set but not permitted"); 716 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 717 goto out; 718 } 719 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 720 goto out; 721 722 case IEEE80211_FC0_TYPE_CTL: 723 vap->iv_stats.is_rx_ctl++; 724 IEEE80211_NODE_STAT(ni, rx_ctrl); 725 goto out; 726 727 default: 728 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 729 wh, "bad", "frame type 0x%x", type); 730 /* should not come here */ 731 break; 732 } 733err: 734 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 735out: 736 if (m != NULL) { 737 if (need_tap && ieee80211_radiotap_active_vap(vap)) 738 ieee80211_radiotap_rx(vap, m); 739 m_freem(m); 740 } 741 return type; 742} 743 744static void 745wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 746 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 747{ 748 struct ieee80211vap *vap = ni->ni_vap; 749 struct ieee80211com *ic = ni->ni_ic; 750 struct ieee80211_frame *wh; 751 u_int8_t *frm, *efrm; 752 753 wh = mtod(m0, struct ieee80211_frame *); 754 frm = (u_int8_t *)&wh[1]; 755 efrm = mtod(m0, u_int8_t *) + m0->m_len; 756 switch (subtype) { 757 case IEEE80211_FC0_SUBTYPE_ACTION: 758 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 759 if (ni == vap->iv_bss) { 760 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 761 wh, NULL, "%s", "unknown node"); 762 vap->iv_stats.is_rx_mgtdiscard++; 763 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 764 /* NB: not interested in multicast frames. */ 765 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 766 wh, NULL, "%s", "not for us"); 767 vap->iv_stats.is_rx_mgtdiscard++; 768 } else if (vap->iv_state != IEEE80211_S_RUN) { 769 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 770 wh, NULL, "wrong state %s", 771 ieee80211_state_name[vap->iv_state]); 772 vap->iv_stats.is_rx_mgtdiscard++; 773 } else { 774 if (ieee80211_parse_action(ni, m0) == 0) 775 (void)ic->ic_recv_action(ni, wh, frm, efrm); 776 } 777 break; 778 779 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 780 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 781 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 782 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 783 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 784 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 785 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 786 case IEEE80211_FC0_SUBTYPE_BEACON: 787 case IEEE80211_FC0_SUBTYPE_ATIM: 788 case IEEE80211_FC0_SUBTYPE_DISASSOC: 789 case IEEE80211_FC0_SUBTYPE_AUTH: 790 case IEEE80211_FC0_SUBTYPE_DEAUTH: 791 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 792 wh, NULL, "%s", "not handled"); 793 vap->iv_stats.is_rx_mgtdiscard++; 794 break; 795 796 default: 797 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 798 wh, "mgt", "subtype 0x%x not handled", subtype); 799 vap->iv_stats.is_rx_badsubtype++; 800 break; 801 } 802} 803