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("$FreeBSD$"); 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 65 static void wds_vattach(struct ieee80211vap *); 66 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int); 67 static int wds_input(struct ieee80211_node *ni, struct mbuf *m, 68 const struct ieee80211_rx_stats *rxs, int, int); 69 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype, 70 const struct ieee80211_rx_stats *, int, int); 71 72 void 73 ieee80211_wds_attach(struct ieee80211com *ic) 74 { 75 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 76 } 77 78 void 79 ieee80211_wds_detach(struct ieee80211com *ic) 80 { 81 } 82 83 static void 84 wds_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 93 static void 94 wds_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 } 101 102 static void 103 wds_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 } 123 124 static int 125 ieee80211_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 */ 233 void 234 ieee80211_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 /* NB: IFQ_HANDOFF reclaims mbuf */ 303 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 304 ieee80211_free_node(ni); 305 } else { 306 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 307 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 308 if_inc_counter(ifp, IFCOUNTER_OBYTES, 309 m->m_pkthdr.len); 310 } 311 } 312 } 313 314 /* 315 * Handle DWDS discovery on receipt of a 4-address frame in 316 * ap mode. Queue the frame and post an event for someone 317 * to plumb the necessary WDS vap for this station. Frames 318 * received prior to the vap set running will then be reprocessed 319 * as if they were just received. 320 */ 321 void 322 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 323 { 324 struct ieee80211com *ic = ni->ni_ic; 325 326 /* 327 * Save the frame with an aging interval 4 times 328 * the listen interval specified by the station. 329 * Frames that sit around too long are reclaimed 330 * using this information. 331 * XXX handle overflow? 332 * XXX per/vap beacon interval? 333 */ 334 m->m_pkthdr.rcvif = (void *)(uintptr_t) 335 ieee80211_mac_hash(ic, ni->ni_macaddr); 336 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 337 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 338 ieee80211_notify_wds_discover(ni); 339 } 340 341 /* 342 * IEEE80211_M_WDS vap state machine handler. 343 */ 344 static int 345 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 346 { 347 struct ieee80211com *ic = vap->iv_ic; 348 struct ieee80211_node *ni; 349 enum ieee80211_state ostate; 350 int error; 351 352 IEEE80211_LOCK_ASSERT(ic); 353 354 ostate = vap->iv_state; 355 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 356 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 357 vap->iv_state = nstate; /* state transition */ 358 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 359 if (ostate != IEEE80211_S_SCAN) 360 ieee80211_cancel_scan(vap); /* background scan */ 361 ni = vap->iv_bss; /* NB: no reference held */ 362 error = 0; 363 switch (nstate) { 364 case IEEE80211_S_INIT: 365 switch (ostate) { 366 case IEEE80211_S_SCAN: 367 ieee80211_cancel_scan(vap); 368 break; 369 default: 370 break; 371 } 372 if (ostate != IEEE80211_S_INIT) { 373 /* NB: optimize INIT -> INIT case */ 374 ieee80211_reset_bss(vap); 375 } 376 break; 377 case IEEE80211_S_SCAN: 378 switch (ostate) { 379 case IEEE80211_S_INIT: 380 ieee80211_check_scan_current(vap); 381 break; 382 default: 383 break; 384 } 385 break; 386 case IEEE80211_S_RUN: 387 if (ostate == IEEE80211_S_INIT) { 388 /* 389 * Already have a channel; bypass the scan 390 * and startup immediately. 391 */ 392 error = ieee80211_create_wds(vap, ic->ic_curchan); 393 } 394 break; 395 default: 396 break; 397 } 398 return error; 399 } 400 401 /* 402 * Process a received frame. The node associated with the sender 403 * should be supplied. If nothing was found in the node table then 404 * the caller is assumed to supply a reference to iv_bss instead. 405 * The RSSI and a timestamp are also supplied. The RSSI data is used 406 * during AP scanning to select a AP to associate with; it can have 407 * any units so long as values have consistent units and higher values 408 * mean ``better signal''. The receive timestamp is currently not used 409 * by the 802.11 layer. 410 */ 411 static int 412 wds_input(struct ieee80211_node *ni, struct mbuf *m, 413 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 414 { 415 struct ieee80211vap *vap = ni->ni_vap; 416 struct ieee80211com *ic = ni->ni_ic; 417 struct ifnet *ifp = vap->iv_ifp; 418 struct ieee80211_frame *wh; 419 struct ieee80211_key *key; 420 struct ether_header *eh; 421 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 422 uint8_t dir, type, subtype, qos; 423 uint16_t rxseq; 424 425 if (m->m_flags & M_AMPDU_MPDU) { 426 /* 427 * Fastpath for A-MPDU reorder q resubmission. Frames 428 * w/ M_AMPDU_MPDU marked have already passed through 429 * here but were received out of order and been held on 430 * the reorder queue. When resubmitted they are marked 431 * with the M_AMPDU_MPDU flag and we can bypass most of 432 * the normal processing. 433 */ 434 wh = mtod(m, struct ieee80211_frame *); 435 type = IEEE80211_FC0_TYPE_DATA; 436 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 437 subtype = IEEE80211_FC0_SUBTYPE_QOS; 438 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 439 goto resubmit_ampdu; 440 } 441 442 KASSERT(ni != NULL, ("null node")); 443 444 type = -1; /* undefined */ 445 446 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 447 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 448 ni->ni_macaddr, NULL, 449 "too short (1): len %u", m->m_pkthdr.len); 450 vap->iv_stats.is_rx_tooshort++; 451 goto out; 452 } 453 /* 454 * Bit of a cheat here, we use a pointer for a 3-address 455 * frame format but don't reference fields past outside 456 * ieee80211_frame_min w/o first validating the data is 457 * present. 458 */ 459 wh = mtod(m, struct ieee80211_frame *); 460 461 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 462 ni->ni_inact = ni->ni_inact_reload; 463 464 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 465 IEEE80211_FC0_VERSION_0) { 466 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 467 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 468 wh->i_fc[0], wh->i_fc[1]); 469 vap->iv_stats.is_rx_badversion++; 470 goto err; 471 } 472 473 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 474 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 475 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 476 477 /* NB: WDS vap's do not scan */ 478 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 479 IEEE80211_DISCARD_MAC(vap, 480 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 481 "too short (3): len %u", m->m_pkthdr.len); 482 vap->iv_stats.is_rx_tooshort++; 483 goto out; 484 } 485 /* NB: the TA is implicitly verified by finding the wds peer node */ 486 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 487 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 488 /* not interested in */ 489 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 490 wh->i_addr1, NULL, "%s", "not to bss"); 491 vap->iv_stats.is_rx_wrongbss++; 492 goto out; 493 } 494 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 495 ni->ni_noise = nf; 496 if (IEEE80211_HAS_SEQ(type, subtype)) { 497 uint8_t tid = ieee80211_gettid(wh); 498 if (IEEE80211_QOS_HAS_SEQ(wh) && 499 TID_TO_WME_AC(tid) >= WME_AC_VI) 500 ic->ic_wme.wme_hipri_traffic++; 501 rxseq = le16toh(*(uint16_t *)wh->i_seq); 502 if (! ieee80211_check_rxseq(ni, wh)) { 503 /* duplicate, discard */ 504 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 505 wh->i_addr1, "duplicate", 506 "seqno <%u,%u> fragno <%u,%u> tid %u", 507 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 508 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 509 rxseq & IEEE80211_SEQ_FRAG_MASK, 510 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 511 tid); 512 vap->iv_stats.is_rx_dup++; 513 IEEE80211_NODE_STAT(ni, rx_dup); 514 goto out; 515 } 516 ni->ni_rxseqs[tid] = rxseq; 517 } 518 switch (type) { 519 case IEEE80211_FC0_TYPE_DATA: 520 hdrspace = ieee80211_hdrspace(ic, wh); 521 if (m->m_len < hdrspace && 522 (m = m_pullup(m, hdrspace)) == NULL) { 523 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 524 ni->ni_macaddr, NULL, 525 "data too short: expecting %u", hdrspace); 526 vap->iv_stats.is_rx_tooshort++; 527 goto out; /* XXX */ 528 } 529 if (dir != IEEE80211_FC1_DIR_DSTODS) { 530 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 531 wh, "data", "incorrect dir 0x%x", dir); 532 vap->iv_stats.is_rx_wrongdir++; 533 goto out; 534 } 535 /* 536 * Only legacy WDS traffic should take this path. 537 */ 538 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 539 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 540 wh, "data", "%s", "not legacy wds"); 541 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 542 goto out; 543 } 544 /* 545 * Handle A-MPDU re-ordering. If the frame is to be 546 * processed directly then ieee80211_ampdu_reorder 547 * will return 0; otherwise it has consumed the mbuf 548 * and we should do nothing more with it. 549 */ 550 if ((m->m_flags & M_AMPDU) && 551 ieee80211_ampdu_reorder(ni, m) != 0) { 552 m = NULL; 553 goto out; 554 } 555 resubmit_ampdu: 556 557 /* 558 * Handle privacy requirements. Note that we 559 * must not be preempted from here until after 560 * we (potentially) call ieee80211_crypto_demic; 561 * otherwise we may violate assumptions in the 562 * crypto cipher modules used to do delayed update 563 * of replay sequence numbers. 564 */ 565 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 566 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 567 /* 568 * Discard encrypted frames when privacy is off. 569 */ 570 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 571 wh, "WEP", "%s", "PRIVACY off"); 572 vap->iv_stats.is_rx_noprivacy++; 573 IEEE80211_NODE_STAT(ni, rx_noprivacy); 574 goto out; 575 } 576 key = ieee80211_crypto_decap(ni, m, hdrspace); 577 if (key == NULL) { 578 /* NB: stats+msgs handled in crypto_decap */ 579 IEEE80211_NODE_STAT(ni, rx_wepfail); 580 goto out; 581 } 582 wh = mtod(m, struct ieee80211_frame *); 583 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 584 } else { 585 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 586 key = NULL; 587 } 588 589 /* 590 * Save QoS bits for use below--before we strip the header. 591 */ 592 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 593 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 594 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 595 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 596 } else 597 qos = 0; 598 599 /* 600 * Next up, any fragmentation. 601 */ 602 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 603 m = ieee80211_defrag(ni, m, hdrspace); 604 if (m == NULL) { 605 /* Fragment dropped or frame not complete yet */ 606 goto out; 607 } 608 } 609 wh = NULL; /* no longer valid, catch any uses */ 610 611 /* 612 * Next strip any MSDU crypto bits. 613 */ 614 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 615 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 616 ni->ni_macaddr, "data", "%s", "demic error"); 617 vap->iv_stats.is_rx_demicfail++; 618 IEEE80211_NODE_STAT(ni, rx_demicfail); 619 goto out; 620 } 621 622 /* copy to listener after decrypt */ 623 if (ieee80211_radiotap_active_vap(vap)) 624 ieee80211_radiotap_rx(vap, m); 625 need_tap = 0; 626 627 /* 628 * Finally, strip the 802.11 header. 629 */ 630 m = ieee80211_decap(vap, m, hdrspace); 631 if (m == NULL) { 632 /* XXX mask bit to check for both */ 633 /* don't count Null data frames as errors */ 634 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 635 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 636 goto out; 637 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 638 ni->ni_macaddr, "data", "%s", "decap error"); 639 vap->iv_stats.is_rx_decap++; 640 IEEE80211_NODE_STAT(ni, rx_decap); 641 goto err; 642 } 643 eh = mtod(m, struct ether_header *); 644 if (!ieee80211_node_is_authorized(ni)) { 645 /* 646 * Deny any non-PAE frames received prior to 647 * authorization. For open/shared-key 648 * authentication the port is mark authorized 649 * after authentication completes. For 802.1x 650 * the port is not marked authorized by the 651 * authenticator until the handshake has completed. 652 */ 653 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 654 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 655 eh->ether_shost, "data", 656 "unauthorized port: ether type 0x%x len %u", 657 eh->ether_type, m->m_pkthdr.len); 658 vap->iv_stats.is_rx_unauth++; 659 IEEE80211_NODE_STAT(ni, rx_unauth); 660 goto err; 661 } 662 } else { 663 /* 664 * When denying unencrypted frames, discard 665 * any non-PAE frames received without encryption. 666 */ 667 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 668 (key == NULL && (m->m_flags & M_WEP) == 0) && 669 eh->ether_type != htons(ETHERTYPE_PAE)) { 670 /* 671 * Drop unencrypted frames. 672 */ 673 vap->iv_stats.is_rx_unencrypted++; 674 IEEE80211_NODE_STAT(ni, rx_unencrypted); 675 goto out; 676 } 677 } 678 /* XXX require HT? */ 679 if (qos & IEEE80211_QOS_AMSDU) { 680 m = ieee80211_decap_amsdu(ni, m); 681 if (m == NULL) 682 return IEEE80211_FC0_TYPE_DATA; 683 } else { 684 #ifdef IEEE80211_SUPPORT_SUPERG 685 m = ieee80211_decap_fastframe(vap, ni, m); 686 if (m == NULL) 687 return IEEE80211_FC0_TYPE_DATA; 688 #endif 689 } 690 ieee80211_deliver_data(vap, ni, m); 691 return IEEE80211_FC0_TYPE_DATA; 692 693 case IEEE80211_FC0_TYPE_MGT: 694 vap->iv_stats.is_rx_mgmt++; 695 IEEE80211_NODE_STAT(ni, rx_mgmt); 696 if (dir != IEEE80211_FC1_DIR_NODS) { 697 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 698 wh, "data", "incorrect dir 0x%x", dir); 699 vap->iv_stats.is_rx_wrongdir++; 700 goto err; 701 } 702 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 703 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 704 ni->ni_macaddr, "mgt", "too short: len %u", 705 m->m_pkthdr.len); 706 vap->iv_stats.is_rx_tooshort++; 707 goto out; 708 } 709 #ifdef IEEE80211_DEBUG 710 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 711 if_printf(ifp, "received %s from %s rssi %d\n", 712 ieee80211_mgt_subtype_name[subtype >> 713 IEEE80211_FC0_SUBTYPE_SHIFT], 714 ether_sprintf(wh->i_addr2), rssi); 715 } 716 #endif 717 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 718 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 719 wh, NULL, "%s", "WEP set but not permitted"); 720 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 721 goto out; 722 } 723 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 724 goto out; 725 726 case IEEE80211_FC0_TYPE_CTL: 727 vap->iv_stats.is_rx_ctl++; 728 IEEE80211_NODE_STAT(ni, rx_ctrl); 729 goto out; 730 731 default: 732 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 733 wh, "bad", "frame type 0x%x", type); 734 /* should not come here */ 735 break; 736 } 737 err: 738 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 739 out: 740 if (m != NULL) { 741 if (need_tap && ieee80211_radiotap_active_vap(vap)) 742 ieee80211_radiotap_rx(vap, m); 743 m_freem(m); 744 } 745 return type; 746 } 747 748 static void 749 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 750 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 751 { 752 struct ieee80211vap *vap = ni->ni_vap; 753 struct ieee80211com *ic = ni->ni_ic; 754 struct ieee80211_frame *wh; 755 u_int8_t *frm, *efrm; 756 757 wh = mtod(m0, struct ieee80211_frame *); 758 frm = (u_int8_t *)&wh[1]; 759 efrm = mtod(m0, u_int8_t *) + m0->m_len; 760 switch (subtype) { 761 case IEEE80211_FC0_SUBTYPE_ACTION: 762 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 763 if (ni == vap->iv_bss) { 764 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 765 wh, NULL, "%s", "unknown node"); 766 vap->iv_stats.is_rx_mgtdiscard++; 767 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 768 /* NB: not interested in multicast frames. */ 769 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 770 wh, NULL, "%s", "not for us"); 771 vap->iv_stats.is_rx_mgtdiscard++; 772 } else if (vap->iv_state != IEEE80211_S_RUN) { 773 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 774 wh, NULL, "wrong state %s", 775 ieee80211_state_name[vap->iv_state]); 776 vap->iv_stats.is_rx_mgtdiscard++; 777 } else { 778 if (ieee80211_parse_action(ni, m0) == 0) 779 (void)ic->ic_recv_action(ni, wh, frm, efrm); 780 } 781 break; 782 783 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 784 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 785 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 786 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 787 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 788 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 789 case IEEE80211_FC0_SUBTYPE_BEACON: 790 case IEEE80211_FC0_SUBTYPE_ATIM: 791 case IEEE80211_FC0_SUBTYPE_DISASSOC: 792 case IEEE80211_FC0_SUBTYPE_AUTH: 793 case IEEE80211_FC0_SUBTYPE_DEAUTH: 794 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 795 wh, NULL, "%s", "not handled"); 796 vap->iv_stats.is_rx_mgtdiscard++; 797 break; 798 799 default: 800 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 801 wh, "mgt", "subtype 0x%x not handled", subtype); 802 vap->iv_stats.is_rx_badsubtype++; 803 break; 804 } 805 } 806