ieee80211_wds.c revision 192468
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 192468 2009-05-20 20:00:40Z 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, int, int); 67static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 68 int subtype, 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 int 101ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 102{ 103 struct ieee80211com *ic = vap->iv_ic; 104 struct ieee80211_node_table *nt = &ic->ic_sta; 105 struct ieee80211_node *ni, *obss; 106 107 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 108 "%s: creating link to %s on channel %u\n", __func__, 109 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 110 111 /* NB: vap create must specify the bssid for the link */ 112 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 113 /* NB: we should only be called on RUN transition */ 114 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 115 116 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 117 /* 118 * Dynamic/non-legacy WDS. Reference the associated 119 * station specified by the desired bssid setup at vap 120 * create. Point ni_wdsvap at the WDS vap so 4-address 121 * frames received through the associated AP vap will 122 * be dispatched upward (e.g. to a bridge) as though 123 * they arrived on the WDS vap. 124 */ 125 IEEE80211_NODE_LOCK(nt); 126 obss = NULL; 127 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 128 if (ni == NULL) { 129 /* 130 * Node went away before we could hookup. This 131 * should be ok; no traffic will flow and a leave 132 * event will be dispatched that should cause 133 * the vap to be destroyed. 134 */ 135 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 136 "%s: station %s went away\n", 137 __func__, ether_sprintf(vap->iv_des_bssid)); 138 /* XXX stat? */ 139 } else if (ni->ni_wdsvap != NULL) { 140 /* 141 * Node already setup with a WDS vap; we cannot 142 * allow multiple references so disallow. If 143 * ni_wdsvap points at us that's ok; we should 144 * do nothing anyway. 145 */ 146 /* XXX printf instead? */ 147 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 148 "%s: station %s in use with %s\n", 149 __func__, ether_sprintf(vap->iv_des_bssid), 150 ni->ni_wdsvap->iv_ifp->if_xname); 151 /* XXX stat? */ 152 } else { 153 /* 154 * Committed to new node, setup state. 155 */ 156 obss = vap->iv_bss; 157 vap->iv_bss = ni; 158 ni->ni_wdsvap = vap; 159 } 160 IEEE80211_NODE_UNLOCK(nt); 161 if (obss != NULL) { 162 /* NB: deferred to avoid recursive lock */ 163 ieee80211_free_node(obss); 164 } 165 } else { 166 /* 167 * Legacy WDS vap setup. 168 */ 169 /* 170 * The far end does not associate so we just create 171 * create a new node and install it as the vap's 172 * bss node. We must simulate an association and 173 * authorize the port for traffic to flow. 174 * XXX check if node already in sta table? 175 */ 176 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 177 if (ni != NULL) { 178 obss = vap->iv_bss; 179 vap->iv_bss = ieee80211_ref_node(ni); 180 ni->ni_flags |= IEEE80211_NODE_AREF; 181 if (obss != NULL) 182 ieee80211_free_node(obss); 183 /* give driver a chance to setup state like ni_txrate */ 184 if (ic->ic_newassoc != NULL) 185 ic->ic_newassoc(ni, 1); 186 /* tell the authenticator about new station */ 187 if (vap->iv_auth->ia_node_join != NULL) 188 vap->iv_auth->ia_node_join(ni); 189 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 190 ieee80211_node_authorize(ni); 191 192 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 193 /* XXX inject l2uf frame */ 194 } 195 } 196 197 /* 198 * Flush pending frames now that were setup. 199 */ 200 if (ni != NULL && IEEE80211_NODE_WDSQ_QLEN(ni) != 0) { 201 int8_t rssi, nf; 202 203 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 204 "flush wds queue, %u packets queued", 205 IEEE80211_NODE_WDSQ_QLEN(ni)); 206 ic->ic_node_getsignal(ni, &rssi, &nf); 207 for (;;) { 208 struct mbuf *m; 209 210 IEEE80211_NODE_WDSQ_LOCK(ni); 211 _IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m); 212 IEEE80211_NODE_WDSQ_UNLOCK(ni); 213 if (m == NULL) 214 break; 215 ieee80211_input(ni, m, rssi, nf); 216 } 217 } 218 return (ni == NULL ? ENOENT : 0); 219} 220 221/* 222 * Propagate multicast frames of an ap vap to all DWDS links. 223 * The caller is assumed to have verified this frame is multicast. 224 */ 225void 226ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 227{ 228 struct ieee80211com *ic = vap0->iv_ic; 229 struct ifnet *parent = ic->ic_ifp; 230 const struct ether_header *eh = mtod(m, const struct ether_header *); 231 struct ieee80211_node *ni; 232 struct ieee80211vap *vap; 233 struct ifnet *ifp; 234 struct mbuf *mcopy; 235 int err; 236 237 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 238 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 239 240 /* XXX locking */ 241 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 242 /* only DWDS vaps are interesting */ 243 if (vap->iv_opmode != IEEE80211_M_WDS || 244 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 245 continue; 246 /* if it came in this interface, don't send it back out */ 247 ifp = vap->iv_ifp; 248 if (ifp == m->m_pkthdr.rcvif) 249 continue; 250 /* 251 * Duplicate the frame and send it. 252 */ 253 mcopy = m_copypacket(m, M_DONTWAIT); 254 if (mcopy == NULL) { 255 ifp->if_oerrors++; 256 /* XXX stat + msg */ 257 continue; 258 } 259 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 260 if (ni == NULL) { 261 /* NB: ieee80211_find_txnode does stat+msg */ 262 ifp->if_oerrors++; 263 m_freem(mcopy); 264 continue; 265 } 266 /* calculate priority so drivers can find the tx queue */ 267 if (ieee80211_classify(ni, mcopy)) { 268 IEEE80211_DISCARD_MAC(vap, 269 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 270 eh->ether_dhost, NULL, 271 "%s", "classification failure"); 272 vap->iv_stats.is_tx_classify++; 273 ifp->if_oerrors++; 274 m_freem(mcopy); 275 ieee80211_free_node(ni); 276 continue; 277 } 278 279 BPF_MTAP(ifp, m); /* 802.3 tx */ 280 281 /* 282 * Encapsulate the packet in prep for transmission. 283 */ 284 mcopy = ieee80211_encap(vap, ni, mcopy); 285 if (m == NULL) { 286 /* NB: stat+msg handled in ieee80211_encap */ 287 ieee80211_free_node(ni); 288 continue; 289 } 290 mcopy->m_flags |= M_MCAST; 291 mcopy->m_pkthdr.rcvif = (void *) ni; 292 293 err = parent->if_transmit(parent, mcopy); 294 if (err) { 295 /* NB: IFQ_HANDOFF reclaims mbuf */ 296 ifp->if_oerrors++; 297 ieee80211_free_node(ni); 298 } else 299 ifp->if_opackets++; 300 } 301} 302 303/* 304 * Handle DWDS discovery on receipt of a 4-address frame in 305 * ap mode. Queue the frame and post an event for someone 306 * to plumb the necessary WDS vap for this station. Frames 307 * received prior to the vap set running will then be reprocessed 308 * as if they were just received. 309 */ 310void 311ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 312{ 313 struct ieee80211vap *vap = ni->ni_vap; 314 struct ieee80211com *ic = ni->ni_ic; 315 int qlen, age; 316 317 IEEE80211_NODE_WDSQ_LOCK(ni); 318 if (!_IF_QFULL(&ni->ni_wdsq)) { 319 /* 320 * Tag the frame with it's expiry time and insert 321 * it in the queue. The aging interval is 4 times 322 * the listen interval specified by the station. 323 * Frames that sit around too long are reclaimed 324 * using this information. 325 */ 326 /* XXX handle overflow? */ 327 /* XXX per/vap beacon interval? */ 328 /* NB: TU -> secs */ 329 age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; 330 _IEEE80211_NODE_WDSQ_ENQUEUE(ni, m, qlen, age); 331 IEEE80211_NODE_WDSQ_UNLOCK(ni); 332 333 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 334 "save frame, %u now queued", qlen); 335 } else { 336 vap->iv_stats.is_dwds_qdrop++; 337 _IF_DROP(&ni->ni_wdsq); 338 IEEE80211_NODE_WDSQ_UNLOCK(ni); 339 340 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_WDS, 341 mtod(m, struct ieee80211_frame *), "wds data", 342 "pending q overflow, drops %d (len %d)", 343 ni->ni_wdsq.ifq_drops, ni->ni_wdsq.ifq_len); 344 345#ifdef IEEE80211_DEBUG 346 if (ieee80211_msg_dumppkts(vap)) 347 ieee80211_dump_pkt(ic, mtod(m, caddr_t), 348 m->m_len, -1, -1); 349#endif 350 /* XXX tail drop? */ 351 m_freem(m); 352 } 353 ieee80211_notify_wds_discover(ni); 354} 355 356/* 357 * Age frames on the WDS pending queue. The aging interval is 358 * 4 times the listen interval specified by the station. This 359 * number is factored into the age calculations when the frame 360 * is placed on the queue. We store ages as time differences 361 * so we can check and/or adjust only the head of the list. 362 * If a frame's age exceeds the threshold then discard it. 363 * The number of frames discarded is returned to the caller. 364 */ 365int 366ieee80211_node_wdsq_age(struct ieee80211_node *ni) 367{ 368#ifdef IEEE80211_DEBUG 369 struct ieee80211vap *vap = ni->ni_vap; 370#endif 371 struct mbuf *m; 372 int discard = 0; 373 374 IEEE80211_NODE_WDSQ_LOCK(ni); 375 while (_IF_POLL(&ni->ni_wdsq, m) != NULL && 376 M_AGE_GET(m) < IEEE80211_INACT_WAIT) { 377 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 378 "discard frame, age %u", M_AGE_GET(m)); 379 380 /* XXX could be optimized */ 381 _IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m); 382 m_freem(m); 383 discard++; 384 } 385 if (m != NULL) 386 M_AGE_SUB(m, IEEE80211_INACT_WAIT); 387 IEEE80211_NODE_WDSQ_UNLOCK(ni); 388 389 IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni, 390 "discard %u frames for age", discard); 391#if 0 392 IEEE80211_NODE_STAT_ADD(ni, wds_discard, discard); 393#endif 394 return discard; 395} 396 397/* 398 * IEEE80211_M_WDS vap state machine handler. 399 */ 400static int 401wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 402{ 403 struct ieee80211com *ic = vap->iv_ic; 404 struct ieee80211_node *ni; 405 enum ieee80211_state ostate; 406 int error; 407 408 IEEE80211_LOCK_ASSERT(ic); 409 410 ostate = vap->iv_state; 411 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 412 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 413 vap->iv_state = nstate; /* state transition */ 414 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 415 if (ostate != IEEE80211_S_SCAN) 416 ieee80211_cancel_scan(vap); /* background scan */ 417 ni = vap->iv_bss; /* NB: no reference held */ 418 error = 0; 419 switch (nstate) { 420 case IEEE80211_S_INIT: 421 switch (ostate) { 422 case IEEE80211_S_SCAN: 423 ieee80211_cancel_scan(vap); 424 break; 425 default: 426 break; 427 } 428 if (ostate != IEEE80211_S_INIT) { 429 /* NB: optimize INIT -> INIT case */ 430 ieee80211_reset_bss(vap); 431 } 432 break; 433 case IEEE80211_S_SCAN: 434 switch (ostate) { 435 case IEEE80211_S_INIT: 436 ieee80211_check_scan_current(vap); 437 break; 438 default: 439 break; 440 } 441 break; 442 case IEEE80211_S_RUN: 443 if (ostate == IEEE80211_S_INIT) { 444 /* 445 * Already have a channel; bypass the scan 446 * and startup immediately. 447 */ 448 error = ieee80211_create_wds(vap, ic->ic_curchan); 449 } 450 break; 451 default: 452 break; 453 } 454 return error; 455} 456 457/* 458 * Process a received frame. The node associated with the sender 459 * should be supplied. If nothing was found in the node table then 460 * the caller is assumed to supply a reference to iv_bss instead. 461 * The RSSI and a timestamp are also supplied. The RSSI data is used 462 * during AP scanning to select a AP to associate with; it can have 463 * any units so long as values have consistent units and higher values 464 * mean ``better signal''. The receive timestamp is currently not used 465 * by the 802.11 layer. 466 */ 467static int 468wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 469{ 470#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 471#define HAS_SEQ(type) ((type & 0x4) == 0) 472 struct ieee80211vap *vap = ni->ni_vap; 473 struct ieee80211com *ic = ni->ni_ic; 474 struct ifnet *ifp = vap->iv_ifp; 475 struct ieee80211_frame *wh; 476 struct ieee80211_key *key; 477 struct ether_header *eh; 478 int hdrspace, need_tap; 479 uint8_t dir, type, subtype, qos; 480 uint16_t rxseq; 481 482 if (m->m_flags & M_AMPDU_MPDU) { 483 /* 484 * Fastpath for A-MPDU reorder q resubmission. Frames 485 * w/ M_AMPDU_MPDU marked have already passed through 486 * here but were received out of order and been held on 487 * the reorder queue. When resubmitted they are marked 488 * with the M_AMPDU_MPDU flag and we can bypass most of 489 * the normal processing. 490 */ 491 wh = mtod(m, struct ieee80211_frame *); 492 type = IEEE80211_FC0_TYPE_DATA; 493 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 494 subtype = IEEE80211_FC0_SUBTYPE_QOS; 495 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 496 goto resubmit_ampdu; 497 } 498 499 KASSERT(ni != NULL, ("null node")); 500 501 need_tap = 1; /* mbuf need to be tapped. */ 502 type = -1; /* undefined */ 503 504 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 505 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 506 ni->ni_macaddr, NULL, 507 "too short (1): len %u", m->m_pkthdr.len); 508 vap->iv_stats.is_rx_tooshort++; 509 goto out; 510 } 511 /* 512 * Bit of a cheat here, we use a pointer for a 3-address 513 * frame format but don't reference fields past outside 514 * ieee80211_frame_min w/o first validating the data is 515 * present. 516 */ 517 wh = mtod(m, struct ieee80211_frame *); 518 519 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 520 IEEE80211_FC0_VERSION_0) { 521 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 522 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 523 wh->i_fc[0], wh->i_fc[1]); 524 vap->iv_stats.is_rx_badversion++; 525 goto err; 526 } 527 528 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 529 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 530 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 531 532 /* NB: WDS vap's do not scan */ 533 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 534 IEEE80211_DISCARD_MAC(vap, 535 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 536 "too short (3): len %u", m->m_pkthdr.len); 537 vap->iv_stats.is_rx_tooshort++; 538 goto out; 539 } 540 /* NB: the TA is implicitly verified by finding the wds peer node */ 541 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 542 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 543 /* not interested in */ 544 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 545 wh->i_addr1, NULL, "%s", "not to bss"); 546 vap->iv_stats.is_rx_wrongbss++; 547 goto out; 548 } 549 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 550 ni->ni_noise = nf; 551 if (HAS_SEQ(type)) { 552 uint8_t tid = ieee80211_gettid(wh); 553 if (IEEE80211_QOS_HAS_SEQ(wh) && 554 TID_TO_WME_AC(tid) >= WME_AC_VI) 555 ic->ic_wme.wme_hipri_traffic++; 556 rxseq = le16toh(*(uint16_t *)wh->i_seq); 557 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 558 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 559 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 560 /* duplicate, discard */ 561 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 562 wh->i_addr1, "duplicate", 563 "seqno <%u,%u> fragno <%u,%u> tid %u", 564 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 565 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 566 rxseq & IEEE80211_SEQ_FRAG_MASK, 567 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 568 tid); 569 vap->iv_stats.is_rx_dup++; 570 IEEE80211_NODE_STAT(ni, rx_dup); 571 goto out; 572 } 573 ni->ni_rxseqs[tid] = rxseq; 574 } 575 switch (type) { 576 case IEEE80211_FC0_TYPE_DATA: 577 hdrspace = ieee80211_hdrspace(ic, wh); 578 if (m->m_len < hdrspace && 579 (m = m_pullup(m, hdrspace)) == NULL) { 580 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 581 ni->ni_macaddr, NULL, 582 "data too short: expecting %u", hdrspace); 583 vap->iv_stats.is_rx_tooshort++; 584 goto out; /* XXX */ 585 } 586 if (dir != IEEE80211_FC1_DIR_DSTODS) { 587 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 588 wh, "data", "incorrect dir 0x%x", dir); 589 vap->iv_stats.is_rx_wrongdir++; 590 goto out; 591 } 592 /* 593 * Only legacy WDS traffic should take this path. 594 */ 595 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 596 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 597 wh, "data", "%s", "not legacy wds"); 598 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 599 goto out; 600 } 601 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 602 ni->ni_inact = ni->ni_inact_reload; 603 /* 604 * Handle A-MPDU re-ordering. If the frame is to be 605 * processed directly then ieee80211_ampdu_reorder 606 * will return 0; otherwise it has consumed the mbuf 607 * and we should do nothing more with it. 608 */ 609 if ((m->m_flags & M_AMPDU) && 610 ieee80211_ampdu_reorder(ni, m) != 0) { 611 m = NULL; 612 goto out; 613 } 614 resubmit_ampdu: 615 616 /* 617 * Handle privacy requirements. Note that we 618 * must not be preempted from here until after 619 * we (potentially) call ieee80211_crypto_demic; 620 * otherwise we may violate assumptions in the 621 * crypto cipher modules used to do delayed update 622 * of replay sequence numbers. 623 */ 624 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 625 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 626 /* 627 * Discard encrypted frames when privacy is off. 628 */ 629 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 630 wh, "WEP", "%s", "PRIVACY off"); 631 vap->iv_stats.is_rx_noprivacy++; 632 IEEE80211_NODE_STAT(ni, rx_noprivacy); 633 goto out; 634 } 635 key = ieee80211_crypto_decap(ni, m, hdrspace); 636 if (key == NULL) { 637 /* NB: stats+msgs handled in crypto_decap */ 638 IEEE80211_NODE_STAT(ni, rx_wepfail); 639 goto out; 640 } 641 wh = mtod(m, struct ieee80211_frame *); 642 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 643 } else { 644 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 645 key = NULL; 646 } 647 648 /* 649 * Save QoS bits for use below--before we strip the header. 650 */ 651 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 652 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 653 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 654 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 655 } else 656 qos = 0; 657 658 /* 659 * Next up, any fragmentation. 660 */ 661 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 662 m = ieee80211_defrag(ni, m, hdrspace); 663 if (m == NULL) { 664 /* Fragment dropped or frame not complete yet */ 665 goto out; 666 } 667 } 668 wh = NULL; /* no longer valid, catch any uses */ 669 670 /* 671 * Next strip any MSDU crypto bits. 672 */ 673 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 674 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 675 ni->ni_macaddr, "data", "%s", "demic error"); 676 vap->iv_stats.is_rx_demicfail++; 677 IEEE80211_NODE_STAT(ni, rx_demicfail); 678 goto out; 679 } 680 681 /* copy to listener after decrypt */ 682 if (ieee80211_radiotap_active_vap(vap)) 683 ieee80211_radiotap_rx(vap, m); 684 need_tap = 0; 685 686 /* 687 * Finally, strip the 802.11 header. 688 */ 689 m = ieee80211_decap(vap, m, hdrspace); 690 if (m == NULL) { 691 /* XXX mask bit to check for both */ 692 /* don't count Null data frames as errors */ 693 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 694 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 695 goto out; 696 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 697 ni->ni_macaddr, "data", "%s", "decap error"); 698 vap->iv_stats.is_rx_decap++; 699 IEEE80211_NODE_STAT(ni, rx_decap); 700 goto err; 701 } 702 eh = mtod(m, struct ether_header *); 703 if (!ieee80211_node_is_authorized(ni)) { 704 /* 705 * Deny any non-PAE frames received prior to 706 * authorization. For open/shared-key 707 * authentication the port is mark authorized 708 * after authentication completes. For 802.1x 709 * the port is not marked authorized by the 710 * authenticator until the handshake has completed. 711 */ 712 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 713 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 714 eh->ether_shost, "data", 715 "unauthorized port: ether type 0x%x len %u", 716 eh->ether_type, m->m_pkthdr.len); 717 vap->iv_stats.is_rx_unauth++; 718 IEEE80211_NODE_STAT(ni, rx_unauth); 719 goto err; 720 } 721 } else { 722 /* 723 * When denying unencrypted frames, discard 724 * any non-PAE frames received without encryption. 725 */ 726 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 727 (key == NULL && (m->m_flags & M_WEP) == 0) && 728 eh->ether_type != htons(ETHERTYPE_PAE)) { 729 /* 730 * Drop unencrypted frames. 731 */ 732 vap->iv_stats.is_rx_unencrypted++; 733 IEEE80211_NODE_STAT(ni, rx_unencrypted); 734 goto out; 735 } 736 } 737 /* XXX require HT? */ 738 if (qos & IEEE80211_QOS_AMSDU) { 739 m = ieee80211_decap_amsdu(ni, m); 740 if (m == NULL) 741 return IEEE80211_FC0_TYPE_DATA; 742 } else { 743#ifdef IEEE80211_SUPPORT_SUPERG 744 m = ieee80211_decap_fastframe(vap, ni, m); 745 if (m == NULL) 746 return IEEE80211_FC0_TYPE_DATA; 747#endif 748 } 749 ieee80211_deliver_data(vap, ni, m); 750 return IEEE80211_FC0_TYPE_DATA; 751 752 case IEEE80211_FC0_TYPE_MGT: 753 vap->iv_stats.is_rx_mgmt++; 754 IEEE80211_NODE_STAT(ni, rx_mgmt); 755 if (dir != IEEE80211_FC1_DIR_NODS) { 756 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 757 wh, "data", "incorrect dir 0x%x", dir); 758 vap->iv_stats.is_rx_wrongdir++; 759 goto err; 760 } 761 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 762 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 763 ni->ni_macaddr, "mgt", "too short: len %u", 764 m->m_pkthdr.len); 765 vap->iv_stats.is_rx_tooshort++; 766 goto out; 767 } 768#ifdef IEEE80211_DEBUG 769 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 770 if_printf(ifp, "received %s from %s rssi %d\n", 771 ieee80211_mgt_subtype_name[subtype >> 772 IEEE80211_FC0_SUBTYPE_SHIFT], 773 ether_sprintf(wh->i_addr2), rssi); 774 } 775#endif 776 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 777 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 778 wh, NULL, "%s", "WEP set but not permitted"); 779 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 780 goto out; 781 } 782 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 783 goto out; 784 785 case IEEE80211_FC0_TYPE_CTL: 786 vap->iv_stats.is_rx_ctl++; 787 IEEE80211_NODE_STAT(ni, rx_ctrl); 788 goto out; 789 790 default: 791 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 792 wh, "bad", "frame type 0x%x", type); 793 /* should not come here */ 794 break; 795 } 796err: 797 ifp->if_ierrors++; 798out: 799 if (m != NULL) { 800 if (need_tap) 801 ieee80211_radiotap_rx(vap, m); 802 m_freem(m); 803 } 804 return type; 805#undef SEQ_LEQ 806} 807 808static void 809wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 810 int subtype, int rssi, int nf) 811{ 812 struct ieee80211vap *vap = ni->ni_vap; 813 struct ieee80211com *ic = ni->ni_ic; 814 struct ieee80211_frame *wh; 815 u_int8_t *frm, *efrm; 816 817 wh = mtod(m0, struct ieee80211_frame *); 818 frm = (u_int8_t *)&wh[1]; 819 efrm = mtod(m0, u_int8_t *) + m0->m_len; 820 switch (subtype) { 821 case IEEE80211_FC0_SUBTYPE_DEAUTH: 822 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 823 case IEEE80211_FC0_SUBTYPE_BEACON: 824 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 825 case IEEE80211_FC0_SUBTYPE_AUTH: 826 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 827 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 828 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 829 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 830 case IEEE80211_FC0_SUBTYPE_DISASSOC: 831 vap->iv_stats.is_rx_mgtdiscard++; 832 break; 833 case IEEE80211_FC0_SUBTYPE_ACTION: 834 if (vap->iv_state != IEEE80211_S_RUN || 835 IEEE80211_IS_MULTICAST(wh->i_addr1)) { 836 vap->iv_stats.is_rx_mgtdiscard++; 837 break; 838 } 839 ni->ni_inact = ni->ni_inact_reload; 840 if (ieee80211_parse_action(ni, m0) == 0) 841 ic->ic_recv_action(ni, frm, efrm); 842 break; 843 default: 844 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 845 wh, "mgt", "subtype 0x%x not handled", subtype); 846 vap->iv_stats.is_rx_badsubtype++; 847 break; 848 } 849} 850