ieee80211_wds.c revision 257176
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 257176 2013-10-26 17:58:36Z glebius $"); 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, int, int); 68static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int, int); 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 void 102wds_flush(struct ieee80211_node *ni) 103{ 104 struct ieee80211com *ic = ni->ni_ic; 105 struct mbuf *m, *next; 106 int8_t rssi, nf; 107 108 m = ieee80211_ageq_remove(&ic->ic_stageq, 109 (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr)); 110 if (m == NULL) 111 return; 112 113 IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni, 114 "%s", "flush wds queue"); 115 ic->ic_node_getsignal(ni, &rssi, &nf); 116 for (; m != NULL; m = next) { 117 next = m->m_nextpkt; 118 m->m_nextpkt = NULL; 119 ieee80211_input(ni, m, rssi, nf); 120 } 121} 122 123static int 124ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan) 125{ 126 struct ieee80211com *ic = vap->iv_ic; 127 struct ieee80211_node_table *nt = &ic->ic_sta; 128 struct ieee80211_node *ni, *obss; 129 130 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 131 "%s: creating link to %s on channel %u\n", __func__, 132 ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan)); 133 134 /* NB: vap create must specify the bssid for the link */ 135 KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid")); 136 /* NB: we should only be called on RUN transition */ 137 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state")); 138 139 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 140 /* 141 * Dynamic/non-legacy WDS. Reference the associated 142 * station specified by the desired bssid setup at vap 143 * create. Point ni_wdsvap at the WDS vap so 4-address 144 * frames received through the associated AP vap will 145 * be dispatched upward (e.g. to a bridge) as though 146 * they arrived on the WDS vap. 147 */ 148 IEEE80211_NODE_LOCK(nt); 149 obss = NULL; 150 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid); 151 if (ni == NULL) { 152 /* 153 * Node went away before we could hookup. This 154 * should be ok; no traffic will flow and a leave 155 * event will be dispatched that should cause 156 * the vap to be destroyed. 157 */ 158 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 159 "%s: station %s went away\n", 160 __func__, ether_sprintf(vap->iv_des_bssid)); 161 /* XXX stat? */ 162 } else if (ni->ni_wdsvap != NULL) { 163 /* 164 * Node already setup with a WDS vap; we cannot 165 * allow multiple references so disallow. If 166 * ni_wdsvap points at us that's ok; we should 167 * do nothing anyway. 168 */ 169 /* XXX printf instead? */ 170 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS, 171 "%s: station %s in use with %s\n", 172 __func__, ether_sprintf(vap->iv_des_bssid), 173 ni->ni_wdsvap->iv_ifp->if_xname); 174 /* XXX stat? */ 175 } else { 176 /* 177 * Committed to new node, setup state. 178 */ 179 obss = vap->iv_bss; 180 vap->iv_bss = ni; 181 ni->ni_wdsvap = vap; 182 } 183 IEEE80211_NODE_UNLOCK(nt); 184 if (obss != NULL) { 185 /* NB: deferred to avoid recursive lock */ 186 ieee80211_free_node(obss); 187 } 188 } else { 189 /* 190 * Legacy WDS vap setup. 191 */ 192 /* 193 * The far end does not associate so we just create 194 * create a new node and install it as the vap's 195 * bss node. We must simulate an association and 196 * authorize the port for traffic to flow. 197 * XXX check if node already in sta table? 198 */ 199 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan); 200 if (ni != NULL) { 201 obss = vap->iv_bss; 202 vap->iv_bss = ieee80211_ref_node(ni); 203 ni->ni_flags |= IEEE80211_NODE_AREF; 204 if (obss != NULL) 205 ieee80211_free_node(obss); 206 /* give driver a chance to setup state like ni_txrate */ 207 if (ic->ic_newassoc != NULL) 208 ic->ic_newassoc(ni, 1); 209 /* tell the authenticator about new station */ 210 if (vap->iv_auth->ia_node_join != NULL) 211 vap->iv_auth->ia_node_join(ni); 212 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 213 ieee80211_node_authorize(ni); 214 215 ieee80211_notify_node_join(ni, 1 /*newassoc*/); 216 /* XXX inject l2uf frame */ 217 } 218 } 219 220 /* 221 * Flush any pending frames now that were setup. 222 */ 223 if (ni != NULL) 224 wds_flush(ni); 225 return (ni == NULL ? ENOENT : 0); 226} 227 228/* 229 * Propagate multicast frames of an ap vap to all DWDS links. 230 * The caller is assumed to have verified this frame is multicast. 231 */ 232void 233ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m) 234{ 235 struct ieee80211com *ic = vap0->iv_ic; 236 const struct ether_header *eh = mtod(m, const struct ether_header *); 237 struct ieee80211_node *ni; 238 struct ieee80211vap *vap; 239 struct ifnet *ifp; 240 struct mbuf *mcopy; 241 int err; 242 243 KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost), 244 ("%s not mcast", ether_sprintf(eh->ether_dhost))); 245 246 /* XXX locking */ 247 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) { 248 /* only DWDS vaps are interesting */ 249 if (vap->iv_opmode != IEEE80211_M_WDS || 250 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)) 251 continue; 252 /* if it came in this interface, don't send it back out */ 253 ifp = vap->iv_ifp; 254 if (ifp == m->m_pkthdr.rcvif) 255 continue; 256 /* 257 * Duplicate the frame and send it. 258 */ 259 mcopy = m_copypacket(m, M_NOWAIT); 260 if (mcopy == NULL) { 261 ifp->if_oerrors++; 262 /* XXX stat + msg */ 263 continue; 264 } 265 ni = ieee80211_find_txnode(vap, eh->ether_dhost); 266 if (ni == NULL) { 267 /* NB: ieee80211_find_txnode does stat+msg */ 268 ifp->if_oerrors++; 269 m_freem(mcopy); 270 continue; 271 } 272 /* calculate priority so drivers can find the tx queue */ 273 if (ieee80211_classify(ni, mcopy)) { 274 IEEE80211_DISCARD_MAC(vap, 275 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS, 276 eh->ether_dhost, NULL, 277 "%s", "classification failure"); 278 vap->iv_stats.is_tx_classify++; 279 ifp->if_oerrors++; 280 m_freem(mcopy); 281 ieee80211_free_node(ni); 282 continue; 283 } 284 285 BPF_MTAP(ifp, m); /* 802.3 tx */ 286 287 /* 288 * Encapsulate the packet in prep for transmission. 289 */ 290 mcopy = ieee80211_encap(vap, ni, mcopy); 291 if (mcopy == NULL) { 292 /* NB: stat+msg handled in ieee80211_encap */ 293 ieee80211_free_node(ni); 294 continue; 295 } 296 mcopy->m_flags |= M_MCAST; 297 mcopy->m_pkthdr.rcvif = (void *) ni; 298 299 err = ieee80211_parent_xmitpkt(ic, mcopy); 300 if (err) { 301 /* NB: IFQ_HANDOFF reclaims mbuf */ 302 ifp->if_oerrors++; 303 ieee80211_free_node(ni); 304 } else 305 ifp->if_opackets++; 306 } 307} 308 309/* 310 * Handle DWDS discovery on receipt of a 4-address frame in 311 * ap mode. Queue the frame and post an event for someone 312 * to plumb the necessary WDS vap for this station. Frames 313 * received prior to the vap set running will then be reprocessed 314 * as if they were just received. 315 */ 316void 317ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 318{ 319 struct ieee80211com *ic = ni->ni_ic; 320 321 /* 322 * Save the frame with an aging interval 4 times 323 * the listen interval specified by the station. 324 * Frames that sit around too long are reclaimed 325 * using this information. 326 * XXX handle overflow? 327 * XXX per/vap beacon interval? 328 */ 329 m->m_pkthdr.rcvif = (void *)(uintptr_t) 330 ieee80211_mac_hash(ic, ni->ni_macaddr); 331 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 332 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 333 ieee80211_notify_wds_discover(ni); 334} 335 336/* 337 * IEEE80211_M_WDS vap state machine handler. 338 */ 339static int 340wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 341{ 342 struct ieee80211com *ic = vap->iv_ic; 343 struct ieee80211_node *ni; 344 enum ieee80211_state ostate; 345 int error; 346 347 IEEE80211_LOCK_ASSERT(ic); 348 349 ostate = vap->iv_state; 350 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 351 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 352 vap->iv_state = nstate; /* state transition */ 353 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 354 if (ostate != IEEE80211_S_SCAN) 355 ieee80211_cancel_scan(vap); /* background scan */ 356 ni = vap->iv_bss; /* NB: no reference held */ 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, int rssi, int nf) 408{ 409#define HAS_SEQ(type) ((type & 0x4) == 0) 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 uint16_t rxseq; 419 420 if (m->m_flags & M_AMPDU_MPDU) { 421 /* 422 * Fastpath for A-MPDU reorder q resubmission. Frames 423 * w/ M_AMPDU_MPDU marked have already passed through 424 * here but were received out of order and been held on 425 * the reorder queue. When resubmitted they are marked 426 * with the M_AMPDU_MPDU flag and we can bypass most of 427 * the normal processing. 428 */ 429 wh = mtod(m, struct ieee80211_frame *); 430 type = IEEE80211_FC0_TYPE_DATA; 431 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 432 subtype = IEEE80211_FC0_SUBTYPE_QOS; 433 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 434 goto resubmit_ampdu; 435 } 436 437 KASSERT(ni != NULL, ("null node")); 438 439 type = -1; /* undefined */ 440 441 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 442 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 443 ni->ni_macaddr, NULL, 444 "too short (1): len %u", m->m_pkthdr.len); 445 vap->iv_stats.is_rx_tooshort++; 446 goto out; 447 } 448 /* 449 * Bit of a cheat here, we use a pointer for a 3-address 450 * frame format but don't reference fields past outside 451 * ieee80211_frame_min w/o first validating the data is 452 * present. 453 */ 454 wh = mtod(m, struct ieee80211_frame *); 455 456 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 457 ni->ni_inact = ni->ni_inact_reload; 458 459 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 460 IEEE80211_FC0_VERSION_0) { 461 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 462 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 463 wh->i_fc[0], wh->i_fc[1]); 464 vap->iv_stats.is_rx_badversion++; 465 goto err; 466 } 467 468 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 469 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 470 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 471 472 /* NB: WDS vap's do not scan */ 473 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 474 IEEE80211_DISCARD_MAC(vap, 475 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 476 "too short (3): len %u", m->m_pkthdr.len); 477 vap->iv_stats.is_rx_tooshort++; 478 goto out; 479 } 480 /* NB: the TA is implicitly verified by finding the wds peer node */ 481 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 482 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 483 /* not interested in */ 484 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 485 wh->i_addr1, NULL, "%s", "not to bss"); 486 vap->iv_stats.is_rx_wrongbss++; 487 goto out; 488 } 489 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 490 ni->ni_noise = nf; 491 if (HAS_SEQ(type)) { 492 uint8_t tid = ieee80211_gettid(wh); 493 if (IEEE80211_QOS_HAS_SEQ(wh) && 494 TID_TO_WME_AC(tid) >= WME_AC_VI) 495 ic->ic_wme.wme_hipri_traffic++; 496 rxseq = le16toh(*(uint16_t *)wh->i_seq); 497 if (! ieee80211_check_rxseq(ni, wh)) { 498 /* duplicate, discard */ 499 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 500 wh->i_addr1, "duplicate", 501 "seqno <%u,%u> fragno <%u,%u> tid %u", 502 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 503 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 504 rxseq & IEEE80211_SEQ_FRAG_MASK, 505 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 506 tid); 507 vap->iv_stats.is_rx_dup++; 508 IEEE80211_NODE_STAT(ni, rx_dup); 509 goto out; 510 } 511 ni->ni_rxseqs[tid] = rxseq; 512 } 513 switch (type) { 514 case IEEE80211_FC0_TYPE_DATA: 515 hdrspace = ieee80211_hdrspace(ic, wh); 516 if (m->m_len < hdrspace && 517 (m = m_pullup(m, hdrspace)) == NULL) { 518 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 519 ni->ni_macaddr, NULL, 520 "data too short: expecting %u", hdrspace); 521 vap->iv_stats.is_rx_tooshort++; 522 goto out; /* XXX */ 523 } 524 if (dir != IEEE80211_FC1_DIR_DSTODS) { 525 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 526 wh, "data", "incorrect dir 0x%x", dir); 527 vap->iv_stats.is_rx_wrongdir++; 528 goto out; 529 } 530 /* 531 * Only legacy WDS traffic should take this path. 532 */ 533 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 534 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 535 wh, "data", "%s", "not legacy wds"); 536 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 537 goto out; 538 } 539 /* 540 * Handle A-MPDU re-ordering. If the frame is to be 541 * processed directly then ieee80211_ampdu_reorder 542 * will return 0; otherwise it has consumed the mbuf 543 * and we should do nothing more with it. 544 */ 545 if ((m->m_flags & M_AMPDU) && 546 ieee80211_ampdu_reorder(ni, m) != 0) { 547 m = NULL; 548 goto out; 549 } 550 resubmit_ampdu: 551 552 /* 553 * Handle privacy requirements. Note that we 554 * must not be preempted from here until after 555 * we (potentially) call ieee80211_crypto_demic; 556 * otherwise we may violate assumptions in the 557 * crypto cipher modules used to do delayed update 558 * of replay sequence numbers. 559 */ 560 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 561 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 562 /* 563 * Discard encrypted frames when privacy is off. 564 */ 565 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 566 wh, "WEP", "%s", "PRIVACY off"); 567 vap->iv_stats.is_rx_noprivacy++; 568 IEEE80211_NODE_STAT(ni, rx_noprivacy); 569 goto out; 570 } 571 key = ieee80211_crypto_decap(ni, m, hdrspace); 572 if (key == NULL) { 573 /* NB: stats+msgs handled in crypto_decap */ 574 IEEE80211_NODE_STAT(ni, rx_wepfail); 575 goto out; 576 } 577 wh = mtod(m, struct ieee80211_frame *); 578 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 579 } else { 580 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 581 key = NULL; 582 } 583 584 /* 585 * Save QoS bits for use below--before we strip the header. 586 */ 587 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 588 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 589 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 590 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 591 } else 592 qos = 0; 593 594 /* 595 * Next up, any fragmentation. 596 */ 597 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 598 m = ieee80211_defrag(ni, m, hdrspace); 599 if (m == NULL) { 600 /* Fragment dropped or frame not complete yet */ 601 goto out; 602 } 603 } 604 wh = NULL; /* no longer valid, catch any uses */ 605 606 /* 607 * Next strip any MSDU crypto bits. 608 */ 609 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 610 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 611 ni->ni_macaddr, "data", "%s", "demic error"); 612 vap->iv_stats.is_rx_demicfail++; 613 IEEE80211_NODE_STAT(ni, rx_demicfail); 614 goto out; 615 } 616 617 /* copy to listener after decrypt */ 618 if (ieee80211_radiotap_active_vap(vap)) 619 ieee80211_radiotap_rx(vap, m); 620 need_tap = 0; 621 622 /* 623 * Finally, strip the 802.11 header. 624 */ 625 m = ieee80211_decap(vap, m, hdrspace); 626 if (m == NULL) { 627 /* XXX mask bit to check for both */ 628 /* don't count Null data frames as errors */ 629 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 630 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 631 goto out; 632 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 633 ni->ni_macaddr, "data", "%s", "decap error"); 634 vap->iv_stats.is_rx_decap++; 635 IEEE80211_NODE_STAT(ni, rx_decap); 636 goto err; 637 } 638 eh = mtod(m, struct ether_header *); 639 if (!ieee80211_node_is_authorized(ni)) { 640 /* 641 * Deny any non-PAE frames received prior to 642 * authorization. For open/shared-key 643 * authentication the port is mark authorized 644 * after authentication completes. For 802.1x 645 * the port is not marked authorized by the 646 * authenticator until the handshake has completed. 647 */ 648 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 649 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 650 eh->ether_shost, "data", 651 "unauthorized port: ether type 0x%x len %u", 652 eh->ether_type, m->m_pkthdr.len); 653 vap->iv_stats.is_rx_unauth++; 654 IEEE80211_NODE_STAT(ni, rx_unauth); 655 goto err; 656 } 657 } else { 658 /* 659 * When denying unencrypted frames, discard 660 * any non-PAE frames received without encryption. 661 */ 662 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 663 (key == NULL && (m->m_flags & M_WEP) == 0) && 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 IEEE80211_FC0_SUBTYPE_SHIFT], 709 ether_sprintf(wh->i_addr2), rssi); 710 } 711#endif 712 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 713 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 714 wh, NULL, "%s", "WEP set but not permitted"); 715 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 716 goto out; 717 } 718 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 719 goto out; 720 721 case IEEE80211_FC0_TYPE_CTL: 722 vap->iv_stats.is_rx_ctl++; 723 IEEE80211_NODE_STAT(ni, rx_ctrl); 724 goto out; 725 726 default: 727 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 728 wh, "bad", "frame type 0x%x", type); 729 /* should not come here */ 730 break; 731 } 732err: 733 ifp->if_ierrors++; 734out: 735 if (m != NULL) { 736 if (need_tap && ieee80211_radiotap_active_vap(vap)) 737 ieee80211_radiotap_rx(vap, m); 738 m_freem(m); 739 } 740 return type; 741} 742 743static void 744wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 745 int subtype, int rssi, int nf) 746{ 747 struct ieee80211vap *vap = ni->ni_vap; 748 struct ieee80211com *ic = ni->ni_ic; 749 struct ieee80211_frame *wh; 750 u_int8_t *frm, *efrm; 751 752 wh = mtod(m0, struct ieee80211_frame *); 753 frm = (u_int8_t *)&wh[1]; 754 efrm = mtod(m0, u_int8_t *) + m0->m_len; 755 switch (subtype) { 756 case IEEE80211_FC0_SUBTYPE_ACTION: 757 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 758 if (ni == vap->iv_bss) { 759 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 760 wh, NULL, "%s", "unknown node"); 761 vap->iv_stats.is_rx_mgtdiscard++; 762 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 763 /* NB: not interested in multicast frames. */ 764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 765 wh, NULL, "%s", "not for us"); 766 vap->iv_stats.is_rx_mgtdiscard++; 767 } else if (vap->iv_state != IEEE80211_S_RUN) { 768 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 769 wh, NULL, "wrong state %s", 770 ieee80211_state_name[vap->iv_state]); 771 vap->iv_stats.is_rx_mgtdiscard++; 772 } else { 773 if (ieee80211_parse_action(ni, m0) == 0) 774 (void)ic->ic_recv_action(ni, wh, frm, efrm); 775 } 776 break; 777 778 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 779 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 780 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 781 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 782 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 783 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 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