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 <netproto/802_11/ieee80211_var.h> 59 #include <netproto/802_11/ieee80211_wds.h> 60 #include <netproto/802_11/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <netproto/802_11/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 IEEE80211_TX_LOCK(ic); 292 mcopy = ieee80211_encap(vap, ni, mcopy); 293 if (mcopy == NULL) { 294 /* NB: stat+msg handled in ieee80211_encap */ 295 IEEE80211_TX_UNLOCK(ic); 296 ieee80211_free_node(ni); 297 continue; 298 } 299 mcopy->m_flags |= M_MCAST; 300 mcopy->m_pkthdr.rcvif = (void *) ni; 301 302 err = ieee80211_parent_xmitpkt(ic, mcopy); 303 IEEE80211_TX_UNLOCK(ic); 304 if (!err) { 305 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 306 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1); 307 if_inc_counter(ifp, IFCOUNTER_OBYTES, 308 m->m_pkthdr.len); 309 } 310 } 311 } 312 313 /* 314 * Handle DWDS discovery on receipt of a 4-address frame in 315 * ap mode. Queue the frame and post an event for someone 316 * to plumb the necessary WDS vap for this station. Frames 317 * received prior to the vap set running will then be reprocessed 318 * as if they were just received. 319 */ 320 void 321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m) 322 { 323 struct ieee80211com *ic = ni->ni_ic; 324 325 /* 326 * Save the frame with an aging interval 4 times 327 * the listen interval specified by the station. 328 * Frames that sit around too long are reclaimed 329 * using this information. 330 * XXX handle overflow? 331 * XXX per/vap beacon interval? 332 */ 333 m->m_pkthdr.rcvif = (void *)(uintptr_t) 334 ieee80211_mac_hash(ic, ni->ni_macaddr); 335 (void) ieee80211_ageq_append(&ic->ic_stageq, m, 336 ((ni->ni_intval * ic->ic_lintval) << 2) / 1024); 337 ieee80211_notify_wds_discover(ni); 338 } 339 340 /* 341 * IEEE80211_M_WDS vap state machine handler. 342 */ 343 static int 344 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 345 { 346 struct ieee80211com *ic = vap->iv_ic; 347 struct ieee80211_node *ni; 348 enum ieee80211_state ostate; 349 int error; 350 351 IEEE80211_LOCK_ASSERT(ic); 352 353 ostate = vap->iv_state; 354 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__, 355 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 356 vap->iv_state = nstate; /* state transition */ 357 callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */ 358 if (ostate != IEEE80211_S_SCAN) 359 ieee80211_cancel_scan(vap); /* background scan */ 360 ni = vap->iv_bss; /* NB: no reference held */ 361 error = 0; 362 switch (nstate) { 363 case IEEE80211_S_INIT: 364 switch (ostate) { 365 case IEEE80211_S_SCAN: 366 ieee80211_cancel_scan(vap); 367 break; 368 default: 369 break; 370 } 371 if (ostate != IEEE80211_S_INIT) { 372 /* NB: optimize INIT -> INIT case */ 373 ieee80211_reset_bss(vap); 374 } 375 break; 376 case IEEE80211_S_SCAN: 377 switch (ostate) { 378 case IEEE80211_S_INIT: 379 ieee80211_check_scan_current(vap); 380 break; 381 default: 382 break; 383 } 384 break; 385 case IEEE80211_S_RUN: 386 if (ostate == IEEE80211_S_INIT) { 387 /* 388 * Already have a channel; bypass the scan 389 * and startup immediately. 390 */ 391 error = ieee80211_create_wds(vap, ic->ic_curchan); 392 } 393 break; 394 default: 395 break; 396 } 397 return error; 398 } 399 400 /* 401 * Process a received frame. The node associated with the sender 402 * should be supplied. If nothing was found in the node table then 403 * the caller is assumed to supply a reference to iv_bss instead. 404 * The RSSI and a timestamp are also supplied. The RSSI data is used 405 * during AP scanning to select a AP to associate with; it can have 406 * any units so long as values have consistent units and higher values 407 * mean ``better signal''. The receive timestamp is currently not used 408 * by the 802.11 layer. 409 */ 410 static int 411 wds_input(struct ieee80211_node *ni, struct mbuf *m, 412 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 413 { 414 struct ieee80211vap *vap = ni->ni_vap; 415 struct ieee80211com *ic = ni->ni_ic; 416 struct ifnet *ifp = vap->iv_ifp; 417 struct ieee80211_frame *wh; 418 struct ieee80211_key *key; 419 struct ether_header *eh; 420 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 421 uint8_t dir, type, subtype, qos; 422 423 if (m->m_flags & M_AMPDU_MPDU) { 424 /* 425 * Fastpath for A-MPDU reorder q resubmission. Frames 426 * w/ M_AMPDU_MPDU marked have already passed through 427 * here but were received out of order and been held on 428 * the reorder queue. When resubmitted they are marked 429 * with the M_AMPDU_MPDU flag and we can bypass most of 430 * the normal processing. 431 */ 432 wh = mtod(m, struct ieee80211_frame *); 433 type = IEEE80211_FC0_TYPE_DATA; 434 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 435 subtype = IEEE80211_FC0_SUBTYPE_QOS; 436 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 437 goto resubmit_ampdu; 438 } 439 440 KASSERT(ni != NULL, ("null node")); 441 442 type = -1; /* undefined */ 443 444 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 445 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 446 ni->ni_macaddr, NULL, 447 "too short (1): len %u", m->m_pkthdr.len); 448 vap->iv_stats.is_rx_tooshort++; 449 goto out; 450 } 451 /* 452 * Bit of a cheat here, we use a pointer for a 3-address 453 * frame format but don't reference fields past outside 454 * ieee80211_frame_min w/o first validating the data is 455 * present. 456 */ 457 wh = mtod(m, struct ieee80211_frame *); 458 459 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 460 ni->ni_inact = ni->ni_inact_reload; 461 462 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 463 IEEE80211_FC0_VERSION_0) { 464 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 465 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 466 wh->i_fc[0], wh->i_fc[1]); 467 vap->iv_stats.is_rx_badversion++; 468 goto err; 469 } 470 471 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 472 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 473 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 474 475 /* NB: WDS vap's do not scan */ 476 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 477 IEEE80211_DISCARD_MAC(vap, 478 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 479 "too short (3): len %u", m->m_pkthdr.len); 480 vap->iv_stats.is_rx_tooshort++; 481 goto out; 482 } 483 /* NB: the TA is implicitly verified by finding the wds peer node */ 484 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 485 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 486 /* not interested in */ 487 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 488 wh->i_addr1, NULL, "%s", "not to bss"); 489 vap->iv_stats.is_rx_wrongbss++; 490 goto out; 491 } 492 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 493 ni->ni_noise = nf; 494 if (IEEE80211_HAS_SEQ(type, subtype)) { 495 uint8_t tid = ieee80211_gettid(wh); 496 if (IEEE80211_QOS_HAS_SEQ(wh) && 497 TID_TO_WME_AC(tid) >= WME_AC_VI) 498 ic->ic_wme.wme_hipri_traffic++; 499 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1)) 500 goto out; 501 } 502 switch (type) { 503 case IEEE80211_FC0_TYPE_DATA: 504 hdrspace = ieee80211_hdrspace(ic, wh); 505 if (m->m_len < hdrspace && 506 (m = m_pullup(m, hdrspace)) == NULL) { 507 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 508 ni->ni_macaddr, NULL, 509 "data too short: expecting %u", hdrspace); 510 vap->iv_stats.is_rx_tooshort++; 511 goto out; /* XXX */ 512 } 513 if (dir != IEEE80211_FC1_DIR_DSTODS) { 514 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 515 wh, "data", "incorrect dir 0x%x", dir); 516 vap->iv_stats.is_rx_wrongdir++; 517 goto out; 518 } 519 /* 520 * Only legacy WDS traffic should take this path. 521 */ 522 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 523 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 524 wh, "data", "%s", "not legacy wds"); 525 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 526 goto out; 527 } 528 /* 529 * Handle A-MPDU re-ordering. If the frame is to be 530 * processed directly then ieee80211_ampdu_reorder 531 * will return 0; otherwise it has consumed the mbuf 532 * and we should do nothing more with it. 533 */ 534 if ((m->m_flags & M_AMPDU) && 535 ieee80211_ampdu_reorder(ni, m) != 0) { 536 m = NULL; 537 goto out; 538 } 539 resubmit_ampdu: 540 541 /* 542 * Handle privacy requirements. Note that we 543 * must not be preempted from here until after 544 * we (potentially) call ieee80211_crypto_demic; 545 * otherwise we may violate assumptions in the 546 * crypto cipher modules used to do delayed update 547 * of replay sequence numbers. 548 */ 549 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 550 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 551 /* 552 * Discard encrypted frames when privacy is off. 553 */ 554 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 555 wh, "WEP", "%s", "PRIVACY off"); 556 vap->iv_stats.is_rx_noprivacy++; 557 IEEE80211_NODE_STAT(ni, rx_noprivacy); 558 goto out; 559 } 560 key = ieee80211_crypto_decap(ni, m, hdrspace); 561 if (key == NULL) { 562 /* NB: stats+msgs handled in crypto_decap */ 563 IEEE80211_NODE_STAT(ni, rx_wepfail); 564 goto out; 565 } 566 wh = mtod(m, struct ieee80211_frame *); 567 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 568 } else { 569 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 570 key = NULL; 571 } 572 573 /* 574 * Save QoS bits for use below--before we strip the header. 575 */ 576 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 577 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 578 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 579 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 580 } else 581 qos = 0; 582 583 /* 584 * Next up, any fragmentation. 585 */ 586 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 587 m = ieee80211_defrag(ni, m, hdrspace); 588 if (m == NULL) { 589 /* Fragment dropped or frame not complete yet */ 590 goto out; 591 } 592 } 593 wh = NULL; /* no longer valid, catch any uses */ 594 595 /* 596 * Next strip any MSDU crypto bits. 597 */ 598 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 599 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 600 ni->ni_macaddr, "data", "%s", "demic error"); 601 vap->iv_stats.is_rx_demicfail++; 602 IEEE80211_NODE_STAT(ni, rx_demicfail); 603 goto out; 604 } 605 606 /* copy to listener after decrypt */ 607 if (ieee80211_radiotap_active_vap(vap)) 608 ieee80211_radiotap_rx(vap, m); 609 need_tap = 0; 610 611 /* 612 * Finally, strip the 802.11 header. 613 */ 614 m = ieee80211_decap(vap, m, hdrspace); 615 if (m == NULL) { 616 /* XXX mask bit to check for both */ 617 /* don't count Null data frames as errors */ 618 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 619 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 620 goto out; 621 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 622 ni->ni_macaddr, "data", "%s", "decap error"); 623 vap->iv_stats.is_rx_decap++; 624 IEEE80211_NODE_STAT(ni, rx_decap); 625 goto err; 626 } 627 eh = mtod(m, struct ether_header *); 628 if (!ieee80211_node_is_authorized(ni)) { 629 /* 630 * Deny any non-PAE frames received prior to 631 * authorization. For open/shared-key 632 * authentication the port is mark authorized 633 * after authentication completes. For 802.1x 634 * the port is not marked authorized by the 635 * authenticator until the handshake has completed. 636 */ 637 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 639 eh->ether_shost, "data", 640 "unauthorized port: ether type 0x%x len %u", 641 eh->ether_type, m->m_pkthdr.len); 642 vap->iv_stats.is_rx_unauth++; 643 IEEE80211_NODE_STAT(ni, rx_unauth); 644 goto err; 645 } 646 } else { 647 /* 648 * When denying unencrypted frames, discard 649 * any non-PAE frames received without encryption. 650 */ 651 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 652 (key == NULL && (m->m_flags & M_WEP) == 0) && 653 eh->ether_type != htons(ETHERTYPE_PAE)) { 654 /* 655 * Drop unencrypted frames. 656 */ 657 vap->iv_stats.is_rx_unencrypted++; 658 IEEE80211_NODE_STAT(ni, rx_unencrypted); 659 goto out; 660 } 661 } 662 /* XXX require HT? */ 663 if (qos & IEEE80211_QOS_AMSDU) { 664 m = ieee80211_decap_amsdu(ni, m); 665 if (m == NULL) 666 return IEEE80211_FC0_TYPE_DATA; 667 } else { 668 #ifdef IEEE80211_SUPPORT_SUPERG 669 m = ieee80211_decap_fastframe(vap, ni, m); 670 if (m == NULL) 671 return IEEE80211_FC0_TYPE_DATA; 672 #endif 673 } 674 ieee80211_deliver_data(vap, ni, m); 675 return IEEE80211_FC0_TYPE_DATA; 676 677 case IEEE80211_FC0_TYPE_MGT: 678 vap->iv_stats.is_rx_mgmt++; 679 IEEE80211_NODE_STAT(ni, rx_mgmt); 680 if (dir != IEEE80211_FC1_DIR_NODS) { 681 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 682 wh, "data", "incorrect dir 0x%x", dir); 683 vap->iv_stats.is_rx_wrongdir++; 684 goto err; 685 } 686 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 687 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 688 ni->ni_macaddr, "mgt", "too short: len %u", 689 m->m_pkthdr.len); 690 vap->iv_stats.is_rx_tooshort++; 691 goto out; 692 } 693 #ifdef IEEE80211_DEBUG 694 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 695 if_printf(ifp, "received %s from %s rssi %d\n", 696 ieee80211_mgt_subtype_name(subtype), 697 ether_sprintf(wh->i_addr2), rssi); 698 } 699 #endif 700 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 701 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 702 wh, NULL, "%s", "WEP set but not permitted"); 703 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 704 goto out; 705 } 706 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 707 goto out; 708 709 case IEEE80211_FC0_TYPE_CTL: 710 vap->iv_stats.is_rx_ctl++; 711 IEEE80211_NODE_STAT(ni, rx_ctrl); 712 goto out; 713 714 default: 715 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 716 wh, "bad", "frame type 0x%x", type); 717 /* should not come here */ 718 break; 719 } 720 err: 721 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 722 out: 723 if (m != NULL) { 724 if (need_tap && ieee80211_radiotap_active_vap(vap)) 725 ieee80211_radiotap_rx(vap, m); 726 m_freem(m); 727 } 728 return type; 729 } 730 731 static void 732 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype, 733 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 734 { 735 struct ieee80211vap *vap = ni->ni_vap; 736 struct ieee80211com *ic = ni->ni_ic; 737 struct ieee80211_frame *wh; 738 u_int8_t *frm, *efrm; 739 740 wh = mtod(m0, struct ieee80211_frame *); 741 frm = (u_int8_t *)&wh[1]; 742 efrm = mtod(m0, u_int8_t *) + m0->m_len; 743 switch (subtype) { 744 case IEEE80211_FC0_SUBTYPE_ACTION: 745 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 746 if (ni == vap->iv_bss) { 747 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 748 wh, NULL, "%s", "unknown node"); 749 vap->iv_stats.is_rx_mgtdiscard++; 750 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 751 /* NB: not interested in multicast frames. */ 752 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 753 wh, NULL, "%s", "not for us"); 754 vap->iv_stats.is_rx_mgtdiscard++; 755 } else if (vap->iv_state != IEEE80211_S_RUN) { 756 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 757 wh, NULL, "wrong state %s", 758 ieee80211_state_name[vap->iv_state]); 759 vap->iv_stats.is_rx_mgtdiscard++; 760 } else { 761 if (ieee80211_parse_action(ni, m0) == 0) 762 (void)ic->ic_recv_action(ni, wh, frm, efrm); 763 } 764 break; 765 766 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 767 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 768 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 769 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 770 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 771 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 772 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 773 case IEEE80211_FC0_SUBTYPE_BEACON: 774 case IEEE80211_FC0_SUBTYPE_ATIM: 775 case IEEE80211_FC0_SUBTYPE_DISASSOC: 776 case IEEE80211_FC0_SUBTYPE_AUTH: 777 case IEEE80211_FC0_SUBTYPE_DEAUTH: 778 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 779 wh, NULL, "%s", "not handled"); 780 vap->iv_stats.is_rx_mgtdiscard++; 781 break; 782 783 default: 784 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 785 wh, "mgt", "subtype 0x%x not handled", subtype); 786 vap->iv_stats.is_rx_badsubtype++; 787 break; 788 } 789 } 790