ieee80211_wds.c revision 190391
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 190391 2009-03-24 20:39:08Z sam $"); 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_media.h> 52#include <net/if_llc.h> 53#include <net/ethernet.h> 54 55#include <net/bpf.h> 56 57#include <net80211/ieee80211_var.h> 58#include <net80211/ieee80211_wds.h> 59#include <net80211/ieee80211_input.h> 60#ifdef IEEE80211_SUPPORT_SUPERG 61#include <net80211/ieee80211_superg.h> 62#endif 63 64static void wds_vattach(struct ieee80211vap *); 65static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 66static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 67 int rssi, int noise, uint32_t rstamp); 68static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int rssi, int noise, u_int32_t rstamp); 70 71void 72ieee80211_wds_attach(struct ieee80211com *ic) 73{ 74 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 75} 76 77void 78ieee80211_wds_detach(struct ieee80211com *ic) 79{ 80} 81 82static void 83wds_vdetach(struct ieee80211vap *vap) 84{ 85 if (vap->iv_bss != NULL) { 86 /* XXX locking? */ 87 if (vap->iv_bss->ni_wdsvap == vap) 88 vap->iv_bss->ni_wdsvap = NULL; 89 } 90} 91 92static void 93wds_vattach(struct ieee80211vap *vap) 94{ 95 vap->iv_newstate = wds_newstate; 96 vap->iv_input = wds_input; 97 vap->iv_recv_mgmt = wds_recv_mgmt; 98 vap->iv_opdetach = wds_vdetach; 99} 100 101static int 102ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 103{ 104 struct ieee80211com *ic = vap->iv_ic; 105 struct ieee80211_node_table *nt = &ic->ic_sta; 106 struct ieee80211_node *ni, *obss; 107 108 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 109 "%s: creating link to %s on channel %u\n", __func__, 110 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 111 112 /* NB: vap create must specify the bssid for the link */ 113 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 114 /* NB: we should only be called on RUN transition */ 115 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 116 117 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 118 /* 119 * Dynamic/non-legacy WDS. Reference the associated 120 * station specified by the desired bssid setup at vap 121 * create. Point ni_wdsvap at the WDS vap so 4-address 122 * frames received through the associated AP vap will 123 * be dispatched upward (e.g. to a bridge) as though 124 * they arrived on the WDS vap. 125 */ 126 IEEE80211_NODE_LOCK(nt); 127 obss = NULL; 128 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 129 if (ni == NULL) { 130 /* 131 * Node went away before we could hookup. This 132 * should be ok; no traffic will flow and a leave 133 * event will be dispatched that should cause 134 * the vap to be destroyed. 135 */ 136 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 137 "%s: station %s went away\n", 138 __func__, ether_sprintf(vap->iv_des_bssid)); 139 /* XXX stat? */ 140 } else if (ni->ni_wdsvap != NULL) { 141 /* 142 * Node already setup with a WDS vap; we cannot 143 * allow multiple references so disallow. If 144 * ni_wdsvap points at us that's ok; we should 145 * do nothing anyway. 146 */ 147 /* XXX printf instead? */ 148 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 149 "%s: station %s in use with %s\n", 150 __func__, ether_sprintf(vap->iv_des_bssid), 151 ni->ni_wdsvap->iv_ifp->if_xname); 152 /* XXX stat? */ 153 } else { 154 /* 155 * Committed to new node, setup state. 156 */ 157 obss = vap->iv_bss; 158 vap->iv_bss = ni; 159 ni->ni_wdsvap = vap; 160 } 161 IEEE80211_NODE_UNLOCK(nt); 162 if (obss != NULL) { 163 /* NB: deferred to avoid recursive lock */ 164 ieee80211_free_node(obss); 165 } 166 } else { 167 /* 168 * Legacy WDS vap setup. 169 */ 170 /* 171 * The far end does not associate so we just create 172 * create a new node and install it as the vap's 173 * bss node. We must simulate an association and 174 * authorize the port for traffic to flow. 175 * XXX check if node already in sta table? 176 */ 177 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 178 if (ni != NULL) { 179 obss = vap->iv_bss; 180 vap->iv_bss = ieee80211_ref_node(ni); 181 ni->ni_flags |= IEEE80211_NODE_AREF; 182 if (obss != NULL) 183 ieee80211_free_node(obss); 184 /* give driver a chance to setup state like ni_txrate */ 185 if (ic->ic_newassoc != NULL) 186 ic->ic_newassoc(ni, 1); 187 /* tell the authenticator about new station */ 188 if (vap->iv_auth->ia_node_join != NULL) 189 vap->iv_auth->ia_node_join(ni); 190 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 191 ieee80211_node_authorize(ni); 192 193 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 194 /* XXX inject l2uf frame */ 195 } 196 } 197 198 /* 199 * Flush pending frames now that were setup. 200 */ 201 if (ni != NULL && IEEE80211_NODE_WDSQ_QLEN(ni) != 0) { 202 int8_t rssi, noise; 203 204 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 205 "flush wds queue, %u packets queued", 206 IEEE80211_NODE_WDSQ_QLEN(ni)); 207 ic->ic_node_getsignal(ni, &rssi, &noise); 208 for (;;) { 209 struct mbuf *m; 210 211 IEEE80211_NODE_WDSQ_LOCK(ni); 212 _IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m); 213 IEEE80211_NODE_WDSQ_UNLOCK(ni); 214 if (m == NULL) 215 break; 216 /* XXX cheat and re-use last rstamp */ 217 ieee80211_input(ni, m, rssi, noise, ni->ni_rstamp); 218 } 219 } 220 return (ni == NULL ? ENOENT : 0); 221} 222 223/* 224 * Propagate multicast frames of an ap vap to all DWDS links. 225 * The caller is assumed to have verified this frame is multicast. 226 */ 227void 228ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 229{ 230 struct ieee80211com *ic = vap0->iv_ic; 231 struct ifnet *parent = ic->ic_ifp; 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. We don't need 254 * to classify or lookup the tx node; this was already 255 * done by the caller so we can just re-use the info. 256 */ 257 mcopy = m_copypacket(m, M_DONTWAIT); 258 if (mcopy == NULL) { 259 ifp->if_oerrors++; 260 /* XXX stat + msg */ 261 continue; 262 } 263 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 264 if (ni == NULL) { 265 /* NB: ieee80211_find_txnode does stat+msg */ 266 ifp->if_oerrors++; 267 m_freem(mcopy); 268 continue; 269 } 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 ifp->if_oerrors++; 277 m_freem(mcopy); 278 ieee80211_free_node(ni); 279 continue; 280 } 281 mcopy->m_flags |= M_MCAST | M_WDS; 282 mcopy->m_pkthdr.rcvif = (void *) ni; 283 284 err = parent->if_transmit(parent, mcopy); 285 if (err) { 286 /* NB: IFQ_HANDOFF reclaims mbuf */ 287 ifp->if_oerrors++; 288 ieee80211_free_node(ni); 289 } else 290 ifp->if_opackets++; 291 } 292} 293 294/* 295 * Handle DWDS discovery on receipt of a 4-address frame in 296 * ap mode. Queue the frame and post an event for someone 297 * to plumb the necessary WDS vap for this station. Frames 298 * received prior to the vap set running will then be reprocessed 299 * as if they were just received. 300 */ 301void 302ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 303{ 304 struct ieee80211vap *vap = ni->ni_vap; 305 struct ieee80211com *ic = ni->ni_ic; 306 int qlen, age; 307 308 IEEE80211_NODE_WDSQ_LOCK(ni); 309 if (!_IF_QFULL(&ni->ni_wdsq)) { 310 /* 311 * Tag the frame with it's expiry time and insert 312 * it in the queue. The aging interval is 4 times 313 * the listen interval specified by the station. 314 * Frames that sit around too long are reclaimed 315 * using this information. 316 */ 317 /* XXX handle overflow? */ 318 /* XXX per/vap beacon interval? */ 319 /* NB: TU -> secs */ 320 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; 321 _IEEE80211_NODE_WDSQ_ENQUEUE(ni, m, qlen, age); 322 IEEE80211_NODE_WDSQ_UNLOCK(ni); 323 324 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 325 "save frame, %u now queued", qlen); 326 } else { 327 vap->iv_stats.is_dwds_qdrop++; 328 _IF_DROP(&ni->ni_wdsq); 329 IEEE80211_NODE_WDSQ_UNLOCK(ni); 330 331 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_WDS, 332 mtod(m, struct ieee80211_frame *), "wds data", 333 "pending q overflow, drops %d (len %d)", 334 ni->ni_wdsq.ifq_drops, ni->ni_wdsq.ifq_len); 335 336#ifdef IEEE80211_DEBUG 337 if (ieee80211_msg_dumppkts(vap)) 338 ieee80211_dump_pkt(ic, mtod(m, caddr_t), 339 m->m_len, -1, -1); 340#endif 341 /* XXX tail drop? */ 342 m_freem(m); 343 } 344 ieee80211_notify_wds_discover(ni); 345} 346 347/* 348 * Age frames on the WDS pending queue. The aging interval is 349 * 4 times the listen interval specified by the station. This 350 * number is factored into the age calculations when the frame 351 * is placed on the queue. We store ages as time differences 352 * so we can check and/or adjust only the head of the list. 353 * If a frame's age exceeds the threshold then discard it. 354 * The number of frames discarded is returned to the caller. 355 */ 356int 357ieee80211_node_wdsq_age(struct ieee80211_node *ni) 358{ 359#ifdef IEEE80211_DEBUG 360 struct ieee80211vap *vap = ni->ni_vap; 361#endif 362 struct mbuf *m; 363 int discard = 0; 364 365 IEEE80211_NODE_WDSQ_LOCK(ni); 366 while (_IF_POLL(&ni->ni_wdsq, m) != NULL && 367 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 368 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 369 "discard frame, age %u", M_AGE_GET(m)); 370 371 /* XXX could be optimized */ 372 _IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m); 373 m_freem(m); 374 discard++; 375 } 376 if (m != NULL) 377 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 378 IEEE80211_NODE_WDSQ_UNLOCK(ni); 379 380 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 381 "discard %u frames for age", discard); 382#if 0 383 IEEE80211_NODE_STAT_ADD(ni, wds_discard, discard); 384#endif 385 return discard; 386} 387 388/* 389 * IEEE80211_M_WDS vap state machine handler. 390 */ 391static int 392wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 393{ 394 struct ieee80211com *ic = vap->iv_ic; 395 struct ieee80211_node *ni; 396 enum ieee80211_state ostate; 397 int error; 398 399 IEEE80211_LOCK_ASSERT(ic); 400 401 ostate = vap->iv_state; 402 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 403 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 404 vap->iv_state = nstate; /* state transition */ 405 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 406 if (ostate != IEEE80211_S_SCAN) 407 ieee80211_cancel_scan(vap); /* background scan */ 408 ni = vap->iv_bss; /* NB: no reference held */ 409 error = 0; 410 switch (nstate) { 411 case IEEE80211_S_INIT: 412 switch (ostate) { 413 case IEEE80211_S_SCAN: 414 ieee80211_cancel_scan(vap); 415 break; 416 default: 417 break; 418 } 419 if (ostate != IEEE80211_S_INIT) { 420 /* NB: optimize INIT -> INIT case */ 421 ieee80211_reset_bss(vap); 422 } 423 break; 424 case IEEE80211_S_SCAN: 425 switch (ostate) { 426 case IEEE80211_S_INIT: 427 ieee80211_check_scan_current(vap); 428 break; 429 default: 430 break; 431 } 432 break; 433 case IEEE80211_S_RUN: 434 if (ostate == IEEE80211_S_INIT) { 435 /* 436 * Already have a channel; bypass the scan 437 * and startup immediately. 438 */ 439 error = ieee80211_create_wds(vap, ic->ic_curchan); 440 } 441 break; 442 default: 443 break; 444 } 445 return error; 446} 447 448/* 449 * Process a received frame. The node associated with the sender 450 * should be supplied. If nothing was found in the node table then 451 * the caller is assumed to supply a reference to iv_bss instead. 452 * The RSSI and a timestamp are also supplied. The RSSI data is used 453 * during AP scanning to select a AP to associate with; it can have 454 * any units so long as values have consistent units and higher values 455 * mean ``better signal''. The receive timestamp is currently not used 456 * by the 802.11 layer. 457 */ 458static int 459wds_input(struct ieee80211_node *ni, struct mbuf *m, 460 int rssi, int noise, uint32_t rstamp) 461{ 462#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 463#define HAS_SEQ(type) ((type & 0x4) == 0) 464 struct ieee80211vap *vap = ni->ni_vap; 465 struct ieee80211com *ic = ni->ni_ic; 466 struct ifnet *ifp = vap->iv_ifp; 467 struct ieee80211_frame *wh; 468 struct ieee80211_key *key; 469 struct ether_header *eh; 470 int hdrspace, need_tap; 471 uint8_t dir, type, subtype, qos; 472 uint16_t rxseq; 473 474 if (m->m_flags & M_AMPDU_MPDU) { 475 /* 476 * Fastpath for A-MPDU reorder q resubmission. Frames 477 * w/ M_AMPDU_MPDU marked have already passed through 478 * here but were received out of order and been held on 479 * the reorder queue. When resubmitted they are marked 480 * with the M_AMPDU_MPDU flag and we can bypass most of 481 * the normal processing. 482 */ 483 wh = mtod(m, struct ieee80211_frame *); 484 type = IEEE80211_FC0_TYPE_DATA; 485 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 486 subtype = IEEE80211_FC0_SUBTYPE_QOS; 487 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 488 goto resubmit_ampdu; 489 } 490 491 KASSERT(ni != NULL, ("null node")); 492 493 need_tap = 1; /* mbuf need to be tapped. */ 494 type = -1; /* undefined */ 495 496 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 497 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 498 ni->ni_macaddr, NULL, 499 "too short (1): len %u", m->m_pkthdr.len); 500 vap->iv_stats.is_rx_tooshort++; 501 goto out; 502 } 503 /* 504 * Bit of a cheat here, we use a pointer for a 3-address 505 * frame format but don't reference fields past outside 506 * ieee80211_frame_min w/o first validating the data is 507 * present. 508 */ 509 wh = mtod(m, struct ieee80211_frame *); 510 511 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 512 IEEE80211_FC0_VERSION_0) { 513 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 514 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 515 vap->iv_stats.is_rx_badversion++; 516 goto err; 517 } 518 519 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 520 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 521 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 522 523 /* NB: WDS vap's do not scan */ 524 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 525 IEEE80211_DISCARD_MAC(vap, 526 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 527 "too short (3): len %u", m->m_pkthdr.len); 528 vap->iv_stats.is_rx_tooshort++; 529 goto out; 530 } 531 /* NB: the TA is implicitly verified by finding the wds peer node */ 532 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 533 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 534 /* not interested in */ 535 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 536 wh->i_addr1, NULL, "%s", "not to bss"); 537 vap->iv_stats.is_rx_wrongbss++; 538 goto out; 539 } 540 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 541 ni->ni_noise = noise; 542 ni->ni_rstamp = rstamp; 543 if (HAS_SEQ(type)) { 544 uint8_t tid = ieee80211_gettid(wh); 545 if (IEEE80211_QOS_HAS_SEQ(wh) && 546 TID_TO_WME_AC(tid) >= WME_AC_VI) 547 ic->ic_wme.wme_hipri_traffic++; 548 rxseq = le16toh(*(uint16_t *)wh->i_seq); 549 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 550 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 551 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 552 /* duplicate, discard */ 553 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 554 wh->i_addr1, "duplicate", 555 "seqno <%u,%u> fragno <%u,%u> tid %u", 556 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 557 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 558 rxseq & IEEE80211_SEQ_FRAG_MASK, 559 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 560 tid); 561 vap->iv_stats.is_rx_dup++; 562 IEEE80211_NODE_STAT(ni, rx_dup); 563 goto out; 564 } 565 ni->ni_rxseqs[tid] = rxseq; 566 } 567 switch (type) { 568 case IEEE80211_FC0_TYPE_DATA: 569 hdrspace = ieee80211_hdrspace(ic, wh); 570 if (m->m_len < hdrspace && 571 (m = m_pullup(m, hdrspace)) == NULL) { 572 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 573 ni->ni_macaddr, NULL, 574 "data too short: expecting %u", hdrspace); 575 vap->iv_stats.is_rx_tooshort++; 576 goto out; /* XXX */ 577 } 578 if (dir != IEEE80211_FC1_DIR_DSTODS) { 579 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 580 wh, "data", "incorrect dir 0x%x", dir); 581 vap->iv_stats.is_rx_wrongdir++; 582 goto out; 583 } 584 /* 585 * Only legacy WDS traffic should take this path. 586 */ 587 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 588 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 589 wh, "data", "%s", "not legacy wds"); 590 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 591 goto out; 592 } 593 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 594 ni->ni_inact = ni->ni_inact_reload; 595 /* 596 * Handle A-MPDU re-ordering. If the frame is to be 597 * processed directly then ieee80211_ampdu_reorder 598 * will return 0; otherwise it has consumed the mbuf 599 * and we should do nothing more with it. 600 */ 601 if ((m->m_flags & M_AMPDU) && 602 ieee80211_ampdu_reorder(ni, m) != 0) { 603 m = NULL; 604 goto out; 605 } 606 resubmit_ampdu: 607 608 /* 609 * Handle privacy requirements. Note that we 610 * must not be preempted from here until after 611 * we (potentially) call ieee80211_crypto_demic; 612 * otherwise we may violate assumptions in the 613 * crypto cipher modules used to do delayed update 614 * of replay sequence numbers. 615 */ 616 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 617 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 618 /* 619 * Discard encrypted frames when privacy is off. 620 */ 621 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 622 wh, "WEP", "%s", "PRIVACY off"); 623 vap->iv_stats.is_rx_noprivacy++; 624 IEEE80211_NODE_STAT(ni, rx_noprivacy); 625 goto out; 626 } 627 key = ieee80211_crypto_decap(ni, m, hdrspace); 628 if (key == NULL) { 629 /* NB: stats+msgs handled in crypto_decap */ 630 IEEE80211_NODE_STAT(ni, rx_wepfail); 631 goto out; 632 } 633 wh = mtod(m, struct ieee80211_frame *); 634 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 635 } else { 636 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 637 key = NULL; 638 } 639 640 /* 641 * Save QoS bits for use below--before we strip the header. 642 */ 643 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 644 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 645 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 646 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 647 } else 648 qos = 0; 649 650 /* 651 * Next up, any fragmentation. 652 */ 653 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 654 m = ieee80211_defrag(ni, m, hdrspace); 655 if (m == NULL) { 656 /* Fragment dropped or frame not complete yet */ 657 goto out; 658 } 659 } 660 wh = NULL; /* no longer valid, catch any uses */ 661 662 /* 663 * Next strip any MSDU crypto bits. 664 */ 665 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 666 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 667 ni->ni_macaddr, "data", "%s", "demic error"); 668 vap->iv_stats.is_rx_demicfail++; 669 IEEE80211_NODE_STAT(ni, rx_demicfail); 670 goto out; 671 } 672 673 /* copy to listener after decrypt */ 674 if (bpf_peers_present(vap->iv_rawbpf)) 675 bpf_mtap(vap->iv_rawbpf, m); 676 need_tap = 0; 677 678 /* 679 * Finally, strip the 802.11 header. 680 */ 681 m = ieee80211_decap(vap, m, hdrspace); 682 if (m == NULL) { 683 /* XXX mask bit to check for both */ 684 /* don't count Null data frames as errors */ 685 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 686 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 687 goto out; 688 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 689 ni->ni_macaddr, "data", "%s", "decap error"); 690 vap->iv_stats.is_rx_decap++; 691 IEEE80211_NODE_STAT(ni, rx_decap); 692 goto err; 693 } 694 eh = mtod(m, struct ether_header *); 695 if (!ieee80211_node_is_authorized(ni)) { 696 /* 697 * Deny any non-PAE frames received prior to 698 * authorization. For open/shared-key 699 * authentication the port is mark authorized 700 * after authentication completes. For 802.1x 701 * the port is not marked authorized by the 702 * authenticator until the handshake has completed. 703 */ 704 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 705 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 706 eh->ether_shost, "data", 707 "unauthorized port: ether type 0x%x len %u", 708 eh->ether_type, m->m_pkthdr.len); 709 vap->iv_stats.is_rx_unauth++; 710 IEEE80211_NODE_STAT(ni, rx_unauth); 711 goto err; 712 } 713 } else { 714 /* 715 * When denying unencrypted frames, discard 716 * any non-PAE frames received without encryption. 717 */ 718 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 719 (key == NULL && (m->m_flags & M_WEP) == 0) && 720 eh->ether_type != htons(ETHERTYPE_PAE)) { 721 /* 722 * Drop unencrypted frames. 723 */ 724 vap->iv_stats.is_rx_unencrypted++; 725 IEEE80211_NODE_STAT(ni, rx_unencrypted); 726 goto out; 727 } 728 } 729 /* XXX require HT? */ 730 if (qos & IEEE80211_QOS_AMSDU) { 731 m = ieee80211_decap_amsdu(ni, m); 732 if (m == NULL) 733 return IEEE80211_FC0_TYPE_DATA; 734 } else { 735#ifdef IEEE80211_SUPPORT_SUPERG 736 m = ieee80211_decap_fastframe(vap, ni, m); 737 if (m == NULL) 738 return IEEE80211_FC0_TYPE_DATA; 739#endif 740 } 741 ieee80211_deliver_data(vap, ni, m); 742 return IEEE80211_FC0_TYPE_DATA; 743 744 case IEEE80211_FC0_TYPE_MGT: 745 vap->iv_stats.is_rx_mgmt++; 746 IEEE80211_NODE_STAT(ni, rx_mgmt); 747 if (dir != IEEE80211_FC1_DIR_NODS) { 748 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 749 wh, "data", "incorrect dir 0x%x", dir); 750 vap->iv_stats.is_rx_wrongdir++; 751 goto err; 752 } 753 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 754 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 755 ni->ni_macaddr, "mgt", "too short: len %u", 756 m->m_pkthdr.len); 757 vap->iv_stats.is_rx_tooshort++; 758 goto out; 759 } 760#ifdef IEEE80211_DEBUG 761 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 762 if_printf(ifp, "received %s from %s rssi %d\n", 763 ieee80211_mgt_subtype_name[subtype >> 764 IEEE80211_FC0_SUBTYPE_SHIFT], 765 ether_sprintf(wh->i_addr2), rssi); 766 } 767#endif 768 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 769 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 770 wh, NULL, "%s", "WEP set but not permitted"); 771 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 772 goto out; 773 } 774 if (bpf_peers_present(vap->iv_rawbpf)) 775 bpf_mtap(vap->iv_rawbpf, m); 776 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 777 m_freem(m); 778 return IEEE80211_FC0_TYPE_MGT; 779 780 case IEEE80211_FC0_TYPE_CTL: 781 vap->iv_stats.is_rx_ctl++; 782 IEEE80211_NODE_STAT(ni, rx_ctrl); 783 goto out; 784 default: 785 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 786 wh, "bad", "frame type 0x%x", type); 787 /* should not come here */ 788 break; 789 } 790err: 791 ifp->if_ierrors++; 792out: 793 if (m != NULL) { 794 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 795 bpf_mtap(vap->iv_rawbpf, m); 796 m_freem(m); 797 } 798 return type; 799#undef SEQ_LEQ 800} 801 802static void 803wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 804 int subtype, int rssi, int noise, u_int32_t rstamp) 805{ 806 struct ieee80211vap *vap = ni->ni_vap; 807 struct ieee80211com *ic = ni->ni_ic; 808 struct ieee80211_frame *wh; 809 u_int8_t *frm, *efrm; 810 811 wh = mtod(m0, struct ieee80211_frame *); 812 frm = (u_int8_t *)&wh[1]; 813 efrm = mtod(m0, u_int8_t *) + m0->m_len; 814 switch (subtype) { 815 case IEEE80211_FC0_SUBTYPE_DEAUTH: 816 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 817 case IEEE80211_FC0_SUBTYPE_BEACON: 818 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 819 case IEEE80211_FC0_SUBTYPE_AUTH: 820 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 821 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 822 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 823 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 824 case IEEE80211_FC0_SUBTYPE_DISASSOC: 825 vap->iv_stats.is_rx_mgtdiscard++; 826 break; 827 case IEEE80211_FC0_SUBTYPE_ACTION: 828 if (vap->iv_state != IEEE80211_S_RUN || 829 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 830 vap->iv_stats.is_rx_mgtdiscard++; 831 break; 832 } 833 ni->ni_inact = ni->ni_inact_reload; 834 if (ieee80211_parse_action(ni, m0) == 0) 835 ic->ic_recv_action(ni, frm, efrm); 836 break; 837 default: 838 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 839 wh, "mgt", "subtype 0x%x not handled", subtype); 840 vap->iv_stats.is_rx_badsubtype++; 841 break; 842 } 843} 844