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, int, int); 68 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, 69 int subtype, int, int); 70 71 void 72 ieee80211_wds_attach(struct ieee80211com *ic) 73 { 74 ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach; 75 } 76 77 void 78 ieee80211_wds_detach(struct ieee80211com *ic) 79 { 80 } 81 82 static void 83 wds_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 92 static void 93 wds_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 } 100 101 static void 102 wds_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 } 122 123 static int 124 ieee80211_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 */ 232 void 233 ieee80211_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 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 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 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 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 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 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 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 303 ieee80211_free_node(ni); 304 } else 305 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 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 */ 316 void 317 ieee80211_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 */ 339 static int 340 wds_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 */ 406 static int 407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 408 { 409 struct ieee80211vap *vap = ni->ni_vap; 410 struct ieee80211com *ic = ni->ni_ic; 411 struct ifnet *ifp = vap->iv_ifp; 412 struct ieee80211_frame *wh; 413 struct ieee80211_key *key; 414 struct ether_header *eh; 415 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 416 uint8_t dir, type, subtype, qos; 417 uint16_t rxseq; 418 419 if (m->m_flags & M_AMPDU_MPDU) { 420 /* 421 * Fastpath for A-MPDU reorder q resubmission. Frames 422 * w/ M_AMPDU_MPDU marked have already passed through 423 * here but were received out of order and been held on 424 * the reorder queue. When resubmitted they are marked 425 * with the M_AMPDU_MPDU flag and we can bypass most of 426 * the normal processing. 427 */ 428 wh = mtod(m, struct ieee80211_frame *); 429 type = IEEE80211_FC0_TYPE_DATA; 430 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 431 subtype = IEEE80211_FC0_SUBTYPE_QOS; 432 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 433 goto resubmit_ampdu; 434 } 435 436 KASSERT(ni != NULL, ("null node")); 437 438 type = -1; /* undefined */ 439 440 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 441 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 442 ni->ni_macaddr, NULL, 443 "too short (1): len %u", m->m_pkthdr.len); 444 vap->iv_stats.is_rx_tooshort++; 445 goto out; 446 } 447 /* 448 * Bit of a cheat here, we use a pointer for a 3-address 449 * frame format but don't reference fields past outside 450 * ieee80211_frame_min w/o first validating the data is 451 * present. 452 */ 453 wh = mtod(m, struct ieee80211_frame *); 454 455 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) 456 ni->ni_inact = ni->ni_inact_reload; 457 458 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 459 IEEE80211_FC0_VERSION_0) { 460 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 461 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 462 wh->i_fc[0], wh->i_fc[1]); 463 vap->iv_stats.is_rx_badversion++; 464 goto err; 465 } 466 467 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 468 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 469 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 470 471 /* NB: WDS vap's do not scan */ 472 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) { 473 IEEE80211_DISCARD_MAC(vap, 474 IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, 475 "too short (3): len %u", m->m_pkthdr.len); 476 vap->iv_stats.is_rx_tooshort++; 477 goto out; 478 } 479 /* NB: the TA is implicitly verified by finding the wds peer node */ 480 if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) && 481 !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { 482 /* not interested in */ 483 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 484 wh->i_addr1, NULL, "%s", "not to bss"); 485 vap->iv_stats.is_rx_wrongbss++; 486 goto out; 487 } 488 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 489 ni->ni_noise = nf; 490 if (IEEE80211_HAS_SEQ(type, subtype)) { 491 uint8_t tid = ieee80211_gettid(wh); 492 if (IEEE80211_QOS_HAS_SEQ(wh) && 493 TID_TO_WME_AC(tid) >= WME_AC_VI) 494 ic->ic_wme.wme_hipri_traffic++; 495 rxseq = le16toh(*(uint16_t *)wh->i_seq); 496 if (! ieee80211_check_rxseq(ni, wh)) { 497 /* duplicate, discard */ 498 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 499 wh->i_addr1, "duplicate", 500 "seqno <%u,%u> fragno <%u,%u> tid %u", 501 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 502 ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, 503 rxseq & IEEE80211_SEQ_FRAG_MASK, 504 ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, 505 tid); 506 vap->iv_stats.is_rx_dup++; 507 IEEE80211_NODE_STAT(ni, rx_dup); 508 goto out; 509 } 510 ni->ni_rxseqs[tid] = rxseq; 511 } 512 switch (type) { 513 case IEEE80211_FC0_TYPE_DATA: 514 hdrspace = ieee80211_hdrspace(ic, wh); 515 if (m->m_len < hdrspace && 516 (m = m_pullup(m, hdrspace)) == NULL) { 517 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 518 ni->ni_macaddr, NULL, 519 "data too short: expecting %u", hdrspace); 520 vap->iv_stats.is_rx_tooshort++; 521 goto out; /* XXX */ 522 } 523 if (dir != IEEE80211_FC1_DIR_DSTODS) { 524 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 525 wh, "data", "incorrect dir 0x%x", dir); 526 vap->iv_stats.is_rx_wrongdir++; 527 goto out; 528 } 529 /* 530 * Only legacy WDS traffic should take this path. 531 */ 532 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) { 533 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 534 wh, "data", "%s", "not legacy wds"); 535 vap->iv_stats.is_rx_wrongdir++;/*XXX*/ 536 goto out; 537 } 538 /* 539 * Handle A-MPDU re-ordering. If the frame is to be 540 * processed directly then ieee80211_ampdu_reorder 541 * will return 0; otherwise it has consumed the mbuf 542 * and we should do nothing more with it. 543 */ 544 if ((m->m_flags & M_AMPDU) && 545 ieee80211_ampdu_reorder(ni, m) != 0) { 546 m = NULL; 547 goto out; 548 } 549 resubmit_ampdu: 550 551 /* 552 * Handle privacy requirements. Note that we 553 * must not be preempted from here until after 554 * we (potentially) call ieee80211_crypto_demic; 555 * otherwise we may violate assumptions in the 556 * crypto cipher modules used to do delayed update 557 * of replay sequence numbers. 558 */ 559 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 560 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 561 /* 562 * Discard encrypted frames when privacy is off. 563 */ 564 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 565 wh, "WEP", "%s", "PRIVACY off"); 566 vap->iv_stats.is_rx_noprivacy++; 567 IEEE80211_NODE_STAT(ni, rx_noprivacy); 568 goto out; 569 } 570 key = ieee80211_crypto_decap(ni, m, hdrspace); 571 if (key == NULL) { 572 /* NB: stats+msgs handled in crypto_decap */ 573 IEEE80211_NODE_STAT(ni, rx_wepfail); 574 goto out; 575 } 576 wh = mtod(m, struct ieee80211_frame *); 577 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 578 } else { 579 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 580 key = NULL; 581 } 582 583 /* 584 * Save QoS bits for use below--before we strip the header. 585 */ 586 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 587 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 588 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 589 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 590 } else 591 qos = 0; 592 593 /* 594 * Next up, any fragmentation. 595 */ 596 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 597 m = ieee80211_defrag(ni, m, hdrspace); 598 if (m == NULL) { 599 /* Fragment dropped or frame not complete yet */ 600 goto out; 601 } 602 } 603 wh = NULL; /* no longer valid, catch any uses */ 604 605 /* 606 * Next strip any MSDU crypto bits. 607 */ 608 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 609 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 610 ni->ni_macaddr, "data", "%s", "demic error"); 611 vap->iv_stats.is_rx_demicfail++; 612 IEEE80211_NODE_STAT(ni, rx_demicfail); 613 goto out; 614 } 615 616 /* copy to listener after decrypt */ 617 if (ieee80211_radiotap_active_vap(vap)) 618 ieee80211_radiotap_rx(vap, m); 619 need_tap = 0; 620 621 /* 622 * Finally, strip the 802.11 header. 623 */ 624 m = ieee80211_decap(vap, m, hdrspace); 625 if (m == NULL) { 626 /* XXX mask bit to check for both */ 627 /* don't count Null data frames as errors */ 628 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 629 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 630 goto out; 631 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 632 ni->ni_macaddr, "data", "%s", "decap error"); 633 vap->iv_stats.is_rx_decap++; 634 IEEE80211_NODE_STAT(ni, rx_decap); 635 goto err; 636 } 637 eh = mtod(m, struct ether_header *); 638 if (!ieee80211_node_is_authorized(ni)) { 639 /* 640 * Deny any non-PAE frames received prior to 641 * authorization. For open/shared-key 642 * authentication the port is mark authorized 643 * after authentication completes. For 802.1x 644 * the port is not marked authorized by the 645 * authenticator until the handshake has completed. 646 */ 647 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 648 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 649 eh->ether_shost, "data", 650 "unauthorized port: ether type 0x%x len %u", 651 eh->ether_type, m->m_pkthdr.len); 652 vap->iv_stats.is_rx_unauth++; 653 IEEE80211_NODE_STAT(ni, rx_unauth); 654 goto err; 655 } 656 } else { 657 /* 658 * When denying unencrypted frames, discard 659 * any non-PAE frames received without encryption. 660 */ 661 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 662 (key == NULL && (m->m_flags & M_WEP) == 0) && 663 eh->ether_type != htons(ETHERTYPE_PAE)) { 664 /* 665 * Drop unencrypted frames. 666 */ 667 vap->iv_stats.is_rx_unencrypted++; 668 IEEE80211_NODE_STAT(ni, rx_unencrypted); 669 goto out; 670 } 671 } 672 /* XXX require HT? */ 673 if (qos & IEEE80211_QOS_AMSDU) { 674 m = ieee80211_decap_amsdu(ni, m); 675 if (m == NULL) 676 return IEEE80211_FC0_TYPE_DATA; 677 } else { 678 #ifdef IEEE80211_SUPPORT_SUPERG 679 m = ieee80211_decap_fastframe(vap, ni, m); 680 if (m == NULL) 681 return IEEE80211_FC0_TYPE_DATA; 682 #endif 683 } 684 ieee80211_deliver_data(vap, ni, m); 685 return IEEE80211_FC0_TYPE_DATA; 686 687 case IEEE80211_FC0_TYPE_MGT: 688 vap->iv_stats.is_rx_mgmt++; 689 IEEE80211_NODE_STAT(ni, rx_mgmt); 690 if (dir != IEEE80211_FC1_DIR_NODS) { 691 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 692 wh, "data", "incorrect dir 0x%x", dir); 693 vap->iv_stats.is_rx_wrongdir++; 694 goto err; 695 } 696 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 697 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 698 ni->ni_macaddr, "mgt", "too short: len %u", 699 m->m_pkthdr.len); 700 vap->iv_stats.is_rx_tooshort++; 701 goto out; 702 } 703 #ifdef IEEE80211_DEBUG 704 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) { 705 if_printf(ifp, "received %s from %s rssi %d\n", 706 ieee80211_mgt_subtype_name[subtype >> 707 IEEE80211_FC0_SUBTYPE_SHIFT], 708 ether_sprintf(wh->i_addr2), rssi); 709 } 710 #endif 711 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 712 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 713 wh, NULL, "%s", "WEP set but not permitted"); 714 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 715 goto out; 716 } 717 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 718 goto out; 719 720 case IEEE80211_FC0_TYPE_CTL: 721 vap->iv_stats.is_rx_ctl++; 722 IEEE80211_NODE_STAT(ni, rx_ctrl); 723 goto out; 724 725 default: 726 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 727 wh, "bad", "frame type 0x%x", type); 728 /* should not come here */ 729 break; 730 } 731 err: 732 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 733 out: 734 if (m != NULL) { 735 if (need_tap && ieee80211_radiotap_active_vap(vap)) 736 ieee80211_radiotap_rx(vap, m); 737 m_freem(m); 738 } 739 return type; 740 } 741 742 static void 743 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 744 int subtype, int rssi, int nf) 745 { 746 struct ieee80211vap *vap = ni->ni_vap; 747 struct ieee80211com *ic = ni->ni_ic; 748 struct ieee80211_frame *wh; 749 u_int8_t *frm, *efrm; 750 751 wh = mtod(m0, struct ieee80211_frame *); 752 frm = (u_int8_t *)&wh[1]; 753 efrm = mtod(m0, u_int8_t *) + m0->m_len; 754 switch (subtype) { 755 case IEEE80211_FC0_SUBTYPE_ACTION: 756 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 757 if (ni == vap->iv_bss) { 758 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 759 wh, NULL, "%s", "unknown node"); 760 vap->iv_stats.is_rx_mgtdiscard++; 761 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) { 762 /* NB: not interested in multicast frames. */ 763 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 764 wh, NULL, "%s", "not for us"); 765 vap->iv_stats.is_rx_mgtdiscard++; 766 } else if (vap->iv_state != IEEE80211_S_RUN) { 767 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 768 wh, NULL, "wrong state %s", 769 ieee80211_state_name[vap->iv_state]); 770 vap->iv_stats.is_rx_mgtdiscard++; 771 } else { 772 if (ieee80211_parse_action(ni, m0) == 0) 773 (void)ic->ic_recv_action(ni, wh, frm, efrm); 774 } 775 break; 776 777 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 778 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 779 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 780 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 781 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 782 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 783 case IEEE80211_FC0_SUBTYPE_BEACON: 784 case IEEE80211_FC0_SUBTYPE_ATIM: 785 case IEEE80211_FC0_SUBTYPE_DISASSOC: 786 case IEEE80211_FC0_SUBTYPE_AUTH: 787 case IEEE80211_FC0_SUBTYPE_DEAUTH: 788 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 789 wh, NULL, "%s", "not handled"); 790 vap->iv_stats.is_rx_mgtdiscard++; 791 break; 792 793 default: 794 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 795 wh, "mgt", "subtype 0x%x not handled", subtype); 796 vap->iv_stats.is_rx_badsubtype++; 797 break; 798 } 799 } 800