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 HOSTAP mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_hostap.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 #include <net80211/ieee80211_wds.h> 64 65 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 66 67 static void hostap_vattach(struct ieee80211vap *); 68 static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 69 static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 70 int rssi, int nf); 71 static void hostap_deliver_data(struct ieee80211vap *, 72 struct ieee80211_node *, struct mbuf *); 73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int nf); 75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int); 76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 77 78 void 79 ieee80211_hostap_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 82 } 83 84 void 85 ieee80211_hostap_detach(struct ieee80211com *ic) 86 { 87 } 88 89 static void 90 hostap_vdetach(struct ieee80211vap *vap) 91 { 92 } 93 94 static void 95 hostap_vattach(struct ieee80211vap *vap) 96 { 97 vap->iv_newstate = hostap_newstate; 98 vap->iv_input = hostap_input; 99 vap->iv_recv_mgmt = hostap_recv_mgmt; 100 vap->iv_recv_ctl = hostap_recv_ctl; 101 vap->iv_opdetach = hostap_vdetach; 102 vap->iv_deliver_data = hostap_deliver_data; 103 } 104 105 static void 106 sta_disassoc(void *arg, struct ieee80211_node *ni) 107 { 108 struct ieee80211vap *vap = arg; 109 110 if (ni->ni_vap == vap && ni->ni_associd != 0) { 111 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 112 IEEE80211_REASON_ASSOC_LEAVE); 113 ieee80211_node_leave(ni); 114 } 115 } 116 117 /* 118 * IEEE80211_M_HOSTAP vap state machine handler. 119 */ 120 static int 121 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 122 { 123 struct ieee80211com *ic = vap->iv_ic; 124 enum ieee80211_state ostate; 125 126 IEEE80211_LOCK_ASSERT(ic); 127 128 ostate = vap->iv_state; 129 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 130 __func__, ieee80211_state_name[ostate], 131 ieee80211_state_name[nstate], arg); 132 vap->iv_state = nstate; /* state transition */ 133 if (ostate != IEEE80211_S_SCAN) 134 ieee80211_cancel_scan(vap); /* background scan */ 135 switch (nstate) { 136 case IEEE80211_S_INIT: 137 switch (ostate) { 138 case IEEE80211_S_SCAN: 139 ieee80211_cancel_scan(vap); 140 break; 141 case IEEE80211_S_CAC: 142 ieee80211_dfs_cac_stop(vap); 143 break; 144 case IEEE80211_S_RUN: 145 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 146 break; 147 default: 148 break; 149 } 150 if (ostate != IEEE80211_S_INIT) { 151 /* NB: optimize INIT -> INIT case */ 152 ieee80211_reset_bss(vap); 153 } 154 if (vap->iv_auth->ia_detach != NULL) 155 vap->iv_auth->ia_detach(vap); 156 break; 157 case IEEE80211_S_SCAN: 158 switch (ostate) { 159 case IEEE80211_S_CSA: 160 case IEEE80211_S_RUN: 161 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 162 /* 163 * Clear overlapping BSS state; the beacon frame 164 * will be reconstructed on transition to the RUN 165 * state and the timeout routines check if the flag 166 * is set before doing anything so this is sufficient. 167 */ 168 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 169 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 170 /* fall thru... */ 171 case IEEE80211_S_CAC: 172 /* 173 * NB: We may get here because of a manual channel 174 * change in which case we need to stop CAC 175 * XXX no need to stop if ostate RUN but it's ok 176 */ 177 ieee80211_dfs_cac_stop(vap); 178 /* fall thru... */ 179 case IEEE80211_S_INIT: 180 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 181 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 182 /* 183 * Already have a channel; bypass the 184 * scan and startup immediately. 185 * ieee80211_create_ibss will call back to 186 * move us to RUN state. 187 */ 188 ieee80211_create_ibss(vap, vap->iv_des_chan); 189 break; 190 } 191 /* 192 * Initiate a scan. We can come here as a result 193 * of an IEEE80211_IOC_SCAN_REQ too in which case 194 * the vap will be marked with IEEE80211_FEXT_SCANREQ 195 * and the scan request parameters will be present 196 * in iv_scanreq. Otherwise we do the default. 197 */ 198 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 199 ieee80211_check_scan(vap, 200 vap->iv_scanreq_flags, 201 vap->iv_scanreq_duration, 202 vap->iv_scanreq_mindwell, 203 vap->iv_scanreq_maxdwell, 204 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 205 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 206 } else 207 ieee80211_check_scan_current(vap); 208 break; 209 case IEEE80211_S_SCAN: 210 /* 211 * A state change requires a reset; scan. 212 */ 213 ieee80211_check_scan_current(vap); 214 break; 215 default: 216 break; 217 } 218 break; 219 case IEEE80211_S_CAC: 220 /* 221 * Start CAC on a DFS channel. We come here when starting 222 * a bss on a DFS channel (see ieee80211_create_ibss). 223 */ 224 ieee80211_dfs_cac_start(vap); 225 break; 226 case IEEE80211_S_RUN: 227 if (vap->iv_flags & IEEE80211_F_WPA) { 228 /* XXX validate prerequisites */ 229 } 230 switch (ostate) { 231 case IEEE80211_S_INIT: 232 /* 233 * Already have a channel; bypass the 234 * scan and startup immediately. 235 * Note that ieee80211_create_ibss will call 236 * back to do a RUN->RUN state change. 237 */ 238 ieee80211_create_ibss(vap, 239 ieee80211_ht_adjust_channel(ic, 240 ic->ic_curchan, vap->iv_flags_ext)); 241 /* NB: iv_bss is changed on return */ 242 break; 243 case IEEE80211_S_CAC: 244 /* 245 * NB: This is the normal state change when CAC 246 * expires and no radar was detected; no need to 247 * clear the CAC timer as it's already expired. 248 */ 249 /* fall thru... */ 250 case IEEE80211_S_CSA: 251 /* 252 * Update bss node channel to reflect where 253 * we landed after CSA. 254 */ 255 ieee80211_node_set_chan(vap->iv_bss, 256 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 257 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 258 /* XXX bypass debug msgs */ 259 break; 260 case IEEE80211_S_SCAN: 261 case IEEE80211_S_RUN: 262 #ifdef IEEE80211_DEBUG 263 if (ieee80211_msg_debug(vap)) { 264 struct ieee80211_node *ni = vap->iv_bss; 265 ieee80211_note(vap, 266 "synchronized with %s ssid ", 267 ether_sprintf(ni->ni_bssid)); 268 ieee80211_print_essid(ni->ni_essid, 269 ni->ni_esslen); 270 /* XXX MCS/HT */ 271 printf(" channel %d start %uMb\n", 272 ieee80211_chan2ieee(ic, ic->ic_curchan), 273 IEEE80211_RATE2MBS(ni->ni_txrate)); 274 } 275 #endif 276 break; 277 default: 278 break; 279 } 280 /* 281 * Start/stop the authenticator. We delay until here 282 * to allow configuration to happen out of order. 283 */ 284 if (vap->iv_auth->ia_attach != NULL) { 285 /* XXX check failure */ 286 vap->iv_auth->ia_attach(vap); 287 } else if (vap->iv_auth->ia_detach != NULL) { 288 vap->iv_auth->ia_detach(vap); 289 } 290 ieee80211_node_authorize(vap->iv_bss); 291 break; 292 default: 293 break; 294 } 295 return 0; 296 } 297 298 static void 299 hostap_deliver_data(struct ieee80211vap *vap, 300 struct ieee80211_node *ni, struct mbuf *m) 301 { 302 struct ether_header *eh = mtod(m, struct ether_header *); 303 struct ifnet *ifp = vap->iv_ifp; 304 305 /* clear driver/net80211 flags before passing up */ 306 m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST); 307 308 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 309 ("gack, opmode %d", vap->iv_opmode)); 310 /* 311 * Do accounting. 312 */ 313 ifp->if_ipackets++; 314 IEEE80211_NODE_STAT(ni, rx_data); 315 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 316 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 317 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 318 IEEE80211_NODE_STAT(ni, rx_mcast); 319 } else 320 IEEE80211_NODE_STAT(ni, rx_ucast); 321 322 /* perform as a bridge within the AP */ 323 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 324 struct mbuf *mcopy = NULL; 325 326 if (m->m_flags & M_MCAST) { 327 mcopy = m_dup(m, M_DONTWAIT); 328 if (mcopy == NULL) 329 ifp->if_oerrors++; 330 else 331 mcopy->m_flags |= M_MCAST; 332 } else { 333 /* 334 * Check if the destination is associated with the 335 * same vap and authorized to receive traffic. 336 * Beware of traffic destined for the vap itself; 337 * sending it will not work; just let it be delivered 338 * normally. 339 */ 340 struct ieee80211_node *sta = ieee80211_find_vap_node( 341 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 342 if (sta != NULL) { 343 if (ieee80211_node_is_authorized(sta)) { 344 /* 345 * Beware of sending to ourself; this 346 * needs to happen via the normal 347 * input path. 348 */ 349 if (sta != vap->iv_bss) { 350 mcopy = m; 351 m = NULL; 352 } 353 } else { 354 vap->iv_stats.is_rx_unauth++; 355 IEEE80211_NODE_STAT(sta, rx_unauth); 356 } 357 ieee80211_free_node(sta); 358 } 359 } 360 if (mcopy != NULL) { 361 int len, err; 362 len = mcopy->m_pkthdr.len; 363 err = ifp->if_transmit(ifp, mcopy); 364 if (err) { 365 /* NB: IFQ_HANDOFF reclaims mcopy */ 366 } else { 367 ifp->if_opackets++; 368 } 369 } 370 } 371 if (m != NULL) { 372 /* 373 * Mark frame as coming from vap's interface. 374 */ 375 m->m_pkthdr.rcvif = ifp; 376 if (m->m_flags & M_MCAST) { 377 /* 378 * Spam DWDS vap's w/ multicast traffic. 379 */ 380 /* XXX only if dwds in use? */ 381 ieee80211_dwds_mcast(vap, m); 382 } 383 if (ni->ni_vlan != 0) { 384 /* attach vlan tag */ 385 m->m_pkthdr.ether_vtag = ni->ni_vlan; 386 m->m_flags |= M_VLANTAG; 387 } 388 ifp->if_input(ifp, m); 389 } 390 } 391 392 /* 393 * Decide if a received management frame should be 394 * printed when debugging is enabled. This filters some 395 * of the less interesting frames that come frequently 396 * (e.g. beacons). 397 */ 398 static __inline int 399 doprint(struct ieee80211vap *vap, int subtype) 400 { 401 switch (subtype) { 402 case IEEE80211_FC0_SUBTYPE_BEACON: 403 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 404 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 405 return 0; 406 } 407 return 1; 408 } 409 410 /* 411 * Process a received frame. The node associated with the sender 412 * should be supplied. If nothing was found in the node table then 413 * the caller is assumed to supply a reference to iv_bss instead. 414 * The RSSI and a timestamp are also supplied. The RSSI data is used 415 * during AP scanning to select a AP to associate with; it can have 416 * any units so long as values have consistent units and higher values 417 * mean ``better signal''. The receive timestamp is currently not used 418 * by the 802.11 layer. 419 */ 420 static int 421 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 422 { 423 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 424 #define HAS_SEQ(type) ((type & 0x4) == 0) 425 struct ieee80211vap *vap = ni->ni_vap; 426 struct ieee80211com *ic = ni->ni_ic; 427 struct ifnet *ifp = vap->iv_ifp; 428 struct ieee80211_frame *wh; 429 struct ieee80211_key *key; 430 struct ether_header *eh; 431 int hdrspace, need_tap; 432 uint8_t dir, type, subtype, qos; 433 uint8_t *bssid; 434 uint16_t rxseq; 435 436 if (m->m_flags & M_AMPDU_MPDU) { 437 /* 438 * Fastpath for A-MPDU reorder q resubmission. Frames 439 * w/ M_AMPDU_MPDU marked have already passed through 440 * here but were received out of order and been held on 441 * the reorder queue. When resubmitted they are marked 442 * with the M_AMPDU_MPDU flag and we can bypass most of 443 * the normal processing. 444 */ 445 wh = mtod(m, struct ieee80211_frame *); 446 type = IEEE80211_FC0_TYPE_DATA; 447 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 448 subtype = IEEE80211_FC0_SUBTYPE_QOS; 449 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 450 goto resubmit_ampdu; 451 } 452 453 KASSERT(ni != NULL, ("null node")); 454 ni->ni_inact = ni->ni_inact_reload; 455 456 need_tap = 1; /* mbuf need to be tapped. */ 457 type = -1; /* undefined */ 458 459 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 460 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 461 ni->ni_macaddr, NULL, 462 "too short (1): len %u", m->m_pkthdr.len); 463 vap->iv_stats.is_rx_tooshort++; 464 goto out; 465 } 466 /* 467 * Bit of a cheat here, we use a pointer for a 3-address 468 * frame format but don't reference fields past outside 469 * ieee80211_frame_min w/o first validating the data is 470 * present. 471 */ 472 wh = mtod(m, struct ieee80211_frame *); 473 474 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 475 IEEE80211_FC0_VERSION_0) { 476 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 477 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 478 wh->i_fc[0], wh->i_fc[1]); 479 vap->iv_stats.is_rx_badversion++; 480 goto err; 481 } 482 483 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 484 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 485 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 486 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 487 if (dir != IEEE80211_FC1_DIR_NODS) 488 bssid = wh->i_addr1; 489 else if (type == IEEE80211_FC0_TYPE_CTL) 490 bssid = wh->i_addr1; 491 else { 492 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 493 IEEE80211_DISCARD_MAC(vap, 494 IEEE80211_MSG_ANY, ni->ni_macaddr, 495 NULL, "too short (2): len %u", 496 m->m_pkthdr.len); 497 vap->iv_stats.is_rx_tooshort++; 498 goto out; 499 } 500 bssid = wh->i_addr3; 501 } 502 /* 503 * Validate the bssid. 504 */ 505 if (!(type == IEEE80211_FC0_TYPE_MGT && 506 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 507 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 508 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 509 /* not interested in */ 510 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 511 bssid, NULL, "%s", "not to bss"); 512 vap->iv_stats.is_rx_wrongbss++; 513 goto out; 514 } 515 516 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 517 ni->ni_noise = nf; 518 if (HAS_SEQ(type)) { 519 uint8_t tid = ieee80211_gettid(wh); 520 if (IEEE80211_QOS_HAS_SEQ(wh) && 521 TID_TO_WME_AC(tid) >= WME_AC_VI) 522 ic->ic_wme.wme_hipri_traffic++; 523 rxseq = le16toh(*(uint16_t *)wh->i_seq); 524 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 525 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 526 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 527 /* duplicate, discard */ 528 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 529 bssid, "duplicate", 530 "seqno <%u,%u> fragno <%u,%u> tid %u", 531 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 532 ni->ni_rxseqs[tid] >> 533 IEEE80211_SEQ_SEQ_SHIFT, 534 rxseq & IEEE80211_SEQ_FRAG_MASK, 535 ni->ni_rxseqs[tid] & 536 IEEE80211_SEQ_FRAG_MASK, 537 tid); 538 vap->iv_stats.is_rx_dup++; 539 IEEE80211_NODE_STAT(ni, rx_dup); 540 goto out; 541 } 542 ni->ni_rxseqs[tid] = rxseq; 543 } 544 } 545 546 switch (type) { 547 case IEEE80211_FC0_TYPE_DATA: 548 hdrspace = ieee80211_hdrspace(ic, wh); 549 if (m->m_len < hdrspace && 550 (m = m_pullup(m, hdrspace)) == NULL) { 551 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 552 ni->ni_macaddr, NULL, 553 "data too short: expecting %u", hdrspace); 554 vap->iv_stats.is_rx_tooshort++; 555 goto out; /* XXX */ 556 } 557 if (!(dir == IEEE80211_FC1_DIR_TODS || 558 (dir == IEEE80211_FC1_DIR_DSTODS && 559 (vap->iv_flags & IEEE80211_F_DWDS)))) { 560 if (dir != IEEE80211_FC1_DIR_DSTODS) { 561 IEEE80211_DISCARD(vap, 562 IEEE80211_MSG_INPUT, wh, "data", 563 "incorrect dir 0x%x", dir); 564 } else { 565 IEEE80211_DISCARD(vap, 566 IEEE80211_MSG_INPUT | 567 IEEE80211_MSG_WDS, wh, 568 "4-address data", 569 "%s", "DWDS not enabled"); 570 } 571 vap->iv_stats.is_rx_wrongdir++; 572 goto out; 573 } 574 /* check if source STA is associated */ 575 if (ni == vap->iv_bss) { 576 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 577 wh, "data", "%s", "unknown src"); 578 ieee80211_send_error(ni, wh->i_addr2, 579 IEEE80211_FC0_SUBTYPE_DEAUTH, 580 IEEE80211_REASON_NOT_AUTHED); 581 vap->iv_stats.is_rx_notassoc++; 582 goto err; 583 } 584 if (ni->ni_associd == 0) { 585 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 586 wh, "data", "%s", "unassoc src"); 587 IEEE80211_SEND_MGMT(ni, 588 IEEE80211_FC0_SUBTYPE_DISASSOC, 589 IEEE80211_REASON_NOT_ASSOCED); 590 vap->iv_stats.is_rx_notassoc++; 591 goto err; 592 } 593 594 /* 595 * Check for power save state change. 596 * XXX out-of-order A-MPDU frames? 597 */ 598 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 599 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 600 ieee80211_node_pwrsave(ni, 601 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 602 /* 603 * For 4-address packets handle WDS discovery 604 * notifications. Once a WDS link is setup frames 605 * are just delivered to the WDS vap (see below). 606 */ 607 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 608 if (!ieee80211_node_is_authorized(ni)) { 609 IEEE80211_DISCARD(vap, 610 IEEE80211_MSG_INPUT | 611 IEEE80211_MSG_WDS, wh, 612 "4-address data", 613 "%s", "unauthorized port"); 614 vap->iv_stats.is_rx_unauth++; 615 IEEE80211_NODE_STAT(ni, rx_unauth); 616 goto err; 617 } 618 ieee80211_dwds_discover(ni, m); 619 return type; 620 } 621 622 /* 623 * Handle A-MPDU re-ordering. If the frame is to be 624 * processed directly then ieee80211_ampdu_reorder 625 * will return 0; otherwise it has consumed the mbuf 626 * and we should do nothing more with it. 627 */ 628 if ((m->m_flags & M_AMPDU) && 629 ieee80211_ampdu_reorder(ni, m) != 0) { 630 m = NULL; 631 goto out; 632 } 633 resubmit_ampdu: 634 635 /* 636 * Handle privacy requirements. Note that we 637 * must not be preempted from here until after 638 * we (potentially) call ieee80211_crypto_demic; 639 * otherwise we may violate assumptions in the 640 * crypto cipher modules used to do delayed update 641 * of replay sequence numbers. 642 */ 643 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 644 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 645 /* 646 * Discard encrypted frames when privacy is off. 647 */ 648 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 649 wh, "WEP", "%s", "PRIVACY off"); 650 vap->iv_stats.is_rx_noprivacy++; 651 IEEE80211_NODE_STAT(ni, rx_noprivacy); 652 goto out; 653 } 654 key = ieee80211_crypto_decap(ni, m, hdrspace); 655 if (key == NULL) { 656 /* NB: stats+msgs handled in crypto_decap */ 657 IEEE80211_NODE_STAT(ni, rx_wepfail); 658 goto out; 659 } 660 wh = mtod(m, struct ieee80211_frame *); 661 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 662 } else { 663 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 664 key = NULL; 665 } 666 667 /* 668 * Save QoS bits for use below--before we strip the header. 669 */ 670 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 671 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 672 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 673 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 674 } else 675 qos = 0; 676 677 /* 678 * Next up, any fragmentation. 679 */ 680 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 681 m = ieee80211_defrag(ni, m, hdrspace); 682 if (m == NULL) { 683 /* Fragment dropped or frame not complete yet */ 684 goto out; 685 } 686 } 687 wh = NULL; /* no longer valid, catch any uses */ 688 689 /* 690 * Next strip any MSDU crypto bits. 691 */ 692 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 693 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 694 ni->ni_macaddr, "data", "%s", "demic error"); 695 vap->iv_stats.is_rx_demicfail++; 696 IEEE80211_NODE_STAT(ni, rx_demicfail); 697 goto out; 698 } 699 /* copy to listener after decrypt */ 700 if (ieee80211_radiotap_active_vap(vap)) 701 ieee80211_radiotap_rx(vap, m); 702 need_tap = 0; 703 /* 704 * Finally, strip the 802.11 header. 705 */ 706 m = ieee80211_decap(vap, m, hdrspace); 707 if (m == NULL) { 708 /* XXX mask bit to check for both */ 709 /* don't count Null data frames as errors */ 710 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 711 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 712 goto out; 713 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 714 ni->ni_macaddr, "data", "%s", "decap error"); 715 vap->iv_stats.is_rx_decap++; 716 IEEE80211_NODE_STAT(ni, rx_decap); 717 goto err; 718 } 719 eh = mtod(m, struct ether_header *); 720 if (!ieee80211_node_is_authorized(ni)) { 721 /* 722 * Deny any non-PAE frames received prior to 723 * authorization. For open/shared-key 724 * authentication the port is mark authorized 725 * after authentication completes. For 802.1x 726 * the port is not marked authorized by the 727 * authenticator until the handshake has completed. 728 */ 729 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 730 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 731 eh->ether_shost, "data", 732 "unauthorized port: ether type 0x%x len %u", 733 eh->ether_type, m->m_pkthdr.len); 734 vap->iv_stats.is_rx_unauth++; 735 IEEE80211_NODE_STAT(ni, rx_unauth); 736 goto err; 737 } 738 } else { 739 /* 740 * When denying unencrypted frames, discard 741 * any non-PAE frames received without encryption. 742 */ 743 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 744 (key == NULL && (m->m_flags & M_WEP) == 0) && 745 eh->ether_type != htons(ETHERTYPE_PAE)) { 746 /* 747 * Drop unencrypted frames. 748 */ 749 vap->iv_stats.is_rx_unencrypted++; 750 IEEE80211_NODE_STAT(ni, rx_unencrypted); 751 goto out; 752 } 753 } 754 /* XXX require HT? */ 755 if (qos & IEEE80211_QOS_AMSDU) { 756 m = ieee80211_decap_amsdu(ni, m); 757 if (m == NULL) 758 return IEEE80211_FC0_TYPE_DATA; 759 } else { 760 #ifdef IEEE80211_SUPPORT_SUPERG 761 m = ieee80211_decap_fastframe(vap, ni, m); 762 if (m == NULL) 763 return IEEE80211_FC0_TYPE_DATA; 764 #endif 765 } 766 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 767 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 768 else 769 hostap_deliver_data(vap, ni, m); 770 return IEEE80211_FC0_TYPE_DATA; 771 772 case IEEE80211_FC0_TYPE_MGT: 773 vap->iv_stats.is_rx_mgmt++; 774 IEEE80211_NODE_STAT(ni, rx_mgmt); 775 if (dir != IEEE80211_FC1_DIR_NODS) { 776 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 777 wh, "mgt", "incorrect dir 0x%x", dir); 778 vap->iv_stats.is_rx_wrongdir++; 779 goto err; 780 } 781 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 782 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 783 ni->ni_macaddr, "mgt", "too short: len %u", 784 m->m_pkthdr.len); 785 vap->iv_stats.is_rx_tooshort++; 786 goto out; 787 } 788 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 789 /* ensure return frames are unicast */ 790 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 791 wh, NULL, "source is multicast: %s", 792 ether_sprintf(wh->i_addr2)); 793 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 794 goto out; 795 } 796 #ifdef IEEE80211_DEBUG 797 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 798 ieee80211_msg_dumppkts(vap)) { 799 if_printf(ifp, "received %s from %s rssi %d\n", 800 ieee80211_mgt_subtype_name[subtype >> 801 IEEE80211_FC0_SUBTYPE_SHIFT], 802 ether_sprintf(wh->i_addr2), rssi); 803 } 804 #endif 805 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 806 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 807 /* 808 * Only shared key auth frames with a challenge 809 * should be encrypted, discard all others. 810 */ 811 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 812 wh, NULL, 813 "%s", "WEP set but not permitted"); 814 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 815 goto out; 816 } 817 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 818 /* 819 * Discard encrypted frames when privacy is off. 820 */ 821 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 822 wh, NULL, "%s", "WEP set but PRIVACY off"); 823 vap->iv_stats.is_rx_noprivacy++; 824 goto out; 825 } 826 hdrspace = ieee80211_hdrspace(ic, wh); 827 key = ieee80211_crypto_decap(ni, m, hdrspace); 828 if (key == NULL) { 829 /* NB: stats+msgs handled in crypto_decap */ 830 goto out; 831 } 832 wh = mtod(m, struct ieee80211_frame *); 833 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 834 } 835 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 836 goto out; 837 838 case IEEE80211_FC0_TYPE_CTL: 839 vap->iv_stats.is_rx_ctl++; 840 IEEE80211_NODE_STAT(ni, rx_ctrl); 841 vap->iv_recv_ctl(ni, m, subtype); 842 goto out; 843 default: 844 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 845 wh, "bad", "frame type 0x%x", type); 846 /* should not come here */ 847 break; 848 } 849 err: 850 ifp->if_ierrors++; 851 out: 852 if (m != NULL) { 853 if (need_tap && ieee80211_radiotap_active_vap(vap)) 854 ieee80211_radiotap_rx(vap, m); 855 m_freem(m); 856 } 857 return type; 858 #undef SEQ_LEQ 859 } 860 861 static void 862 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 863 int rssi, int nf, uint16_t seq, uint16_t status) 864 { 865 struct ieee80211vap *vap = ni->ni_vap; 866 867 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 868 869 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 870 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 871 ni->ni_macaddr, "open auth", 872 "bad sta auth mode %u", ni->ni_authmode); 873 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 874 /* 875 * Clear any challenge text that may be there if 876 * a previous shared key auth failed and then an 877 * open auth is attempted. 878 */ 879 if (ni->ni_challenge != NULL) { 880 free(ni->ni_challenge, M_80211_NODE); 881 ni->ni_challenge = NULL; 882 } 883 /* XXX hack to workaround calling convention */ 884 ieee80211_send_error(ni, wh->i_addr2, 885 IEEE80211_FC0_SUBTYPE_AUTH, 886 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 887 return; 888 } 889 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 890 vap->iv_stats.is_rx_bad_auth++; 891 return; 892 } 893 /* always accept open authentication requests */ 894 if (ni == vap->iv_bss) { 895 ni = ieee80211_dup_bss(vap, wh->i_addr2); 896 if (ni == NULL) 897 return; 898 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 899 (void) ieee80211_ref_node(ni); 900 /* 901 * Mark the node as referenced to reflect that it's 902 * reference count has been bumped to insure it remains 903 * after the transaction completes. 904 */ 905 ni->ni_flags |= IEEE80211_NODE_AREF; 906 /* 907 * Mark the node as requiring a valid association id 908 * before outbound traffic is permitted. 909 */ 910 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 911 912 if (vap->iv_acl != NULL && 913 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 914 /* 915 * When the ACL policy is set to RADIUS we defer the 916 * authorization to a user agent. Dispatch an event, 917 * a subsequent MLME call will decide the fate of the 918 * station. If the user agent is not present then the 919 * node will be reclaimed due to inactivity. 920 */ 921 IEEE80211_NOTE_MAC(vap, 922 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 923 "%s", "station authentication defered (radius acl)"); 924 ieee80211_notify_node_auth(ni); 925 } else { 926 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 927 IEEE80211_NOTE_MAC(vap, 928 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 929 "%s", "station authenticated (open)"); 930 /* 931 * When 802.1x is not in use mark the port 932 * authorized at this point so traffic can flow. 933 */ 934 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 935 ieee80211_node_authorize(ni); 936 } 937 } 938 939 static void 940 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 941 uint8_t *frm, uint8_t *efrm, int rssi, int nf, 942 uint16_t seq, uint16_t status) 943 { 944 struct ieee80211vap *vap = ni->ni_vap; 945 uint8_t *challenge; 946 int allocbs, estatus; 947 948 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 949 950 /* 951 * NB: this can happen as we allow pre-shared key 952 * authentication to be enabled w/o wep being turned 953 * on so that configuration of these can be done 954 * in any order. It may be better to enforce the 955 * ordering in which case this check would just be 956 * for sanity/consistency. 957 */ 958 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 959 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 960 ni->ni_macaddr, "shared key auth", 961 "%s", " PRIVACY is disabled"); 962 estatus = IEEE80211_STATUS_ALG; 963 goto bad; 964 } 965 /* 966 * Pre-shared key authentication is evil; accept 967 * it only if explicitly configured (it is supported 968 * mainly for compatibility with clients like Mac OS X). 969 */ 970 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 971 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 972 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 973 ni->ni_macaddr, "shared key auth", 974 "bad sta auth mode %u", ni->ni_authmode); 975 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 976 estatus = IEEE80211_STATUS_ALG; 977 goto bad; 978 } 979 980 challenge = NULL; 981 if (frm + 1 < efrm) { 982 if ((frm[1] + 2) > (efrm - frm)) { 983 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 984 ni->ni_macaddr, "shared key auth", 985 "ie %d/%d too long", 986 frm[0], (frm[1] + 2) - (efrm - frm)); 987 vap->iv_stats.is_rx_bad_auth++; 988 estatus = IEEE80211_STATUS_CHALLENGE; 989 goto bad; 990 } 991 if (*frm == IEEE80211_ELEMID_CHALLENGE) 992 challenge = frm; 993 frm += frm[1] + 2; 994 } 995 switch (seq) { 996 case IEEE80211_AUTH_SHARED_CHALLENGE: 997 case IEEE80211_AUTH_SHARED_RESPONSE: 998 if (challenge == NULL) { 999 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1000 ni->ni_macaddr, "shared key auth", 1001 "%s", "no challenge"); 1002 vap->iv_stats.is_rx_bad_auth++; 1003 estatus = IEEE80211_STATUS_CHALLENGE; 1004 goto bad; 1005 } 1006 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1007 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1008 ni->ni_macaddr, "shared key auth", 1009 "bad challenge len %d", challenge[1]); 1010 vap->iv_stats.is_rx_bad_auth++; 1011 estatus = IEEE80211_STATUS_CHALLENGE; 1012 goto bad; 1013 } 1014 default: 1015 break; 1016 } 1017 switch (seq) { 1018 case IEEE80211_AUTH_SHARED_REQUEST: 1019 if (ni == vap->iv_bss) { 1020 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1021 if (ni == NULL) { 1022 /* NB: no way to return an error */ 1023 return; 1024 } 1025 allocbs = 1; 1026 } else { 1027 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1028 (void) ieee80211_ref_node(ni); 1029 allocbs = 0; 1030 } 1031 /* 1032 * Mark the node as referenced to reflect that it's 1033 * reference count has been bumped to insure it remains 1034 * after the transaction completes. 1035 */ 1036 ni->ni_flags |= IEEE80211_NODE_AREF; 1037 /* 1038 * Mark the node as requiring a valid associatio id 1039 * before outbound traffic is permitted. 1040 */ 1041 ni->ni_flags |= IEEE80211_NODE_ASSOCID; 1042 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1043 ni->ni_noise = nf; 1044 if (!ieee80211_alloc_challenge(ni)) { 1045 /* NB: don't return error so they rexmit */ 1046 return; 1047 } 1048 get_random_bytes(ni->ni_challenge, 1049 IEEE80211_CHALLENGE_LEN); 1050 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1051 ni, "shared key %sauth request", allocbs ? "" : "re"); 1052 /* 1053 * When the ACL policy is set to RADIUS we defer the 1054 * authorization to a user agent. Dispatch an event, 1055 * a subsequent MLME call will decide the fate of the 1056 * station. If the user agent is not present then the 1057 * node will be reclaimed due to inactivity. 1058 */ 1059 if (vap->iv_acl != NULL && 1060 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1061 IEEE80211_NOTE_MAC(vap, 1062 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1063 ni->ni_macaddr, 1064 "%s", "station authentication defered (radius acl)"); 1065 ieee80211_notify_node_auth(ni); 1066 return; 1067 } 1068 break; 1069 case IEEE80211_AUTH_SHARED_RESPONSE: 1070 if (ni == vap->iv_bss) { 1071 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1072 ni->ni_macaddr, "shared key response", 1073 "%s", "unknown station"); 1074 /* NB: don't send a response */ 1075 return; 1076 } 1077 if (ni->ni_challenge == NULL) { 1078 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1079 ni->ni_macaddr, "shared key response", 1080 "%s", "no challenge recorded"); 1081 vap->iv_stats.is_rx_bad_auth++; 1082 estatus = IEEE80211_STATUS_CHALLENGE; 1083 goto bad; 1084 } 1085 if (memcmp(ni->ni_challenge, &challenge[2], 1086 challenge[1]) != 0) { 1087 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1088 ni->ni_macaddr, "shared key response", 1089 "%s", "challenge mismatch"); 1090 vap->iv_stats.is_rx_auth_fail++; 1091 estatus = IEEE80211_STATUS_CHALLENGE; 1092 goto bad; 1093 } 1094 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1095 ni, "%s", "station authenticated (shared key)"); 1096 ieee80211_node_authorize(ni); 1097 break; 1098 default: 1099 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1100 ni->ni_macaddr, "shared key auth", 1101 "bad seq %d", seq); 1102 vap->iv_stats.is_rx_bad_auth++; 1103 estatus = IEEE80211_STATUS_SEQUENCE; 1104 goto bad; 1105 } 1106 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1107 return; 1108 bad: 1109 /* 1110 * Send an error response; but only when operating as an AP. 1111 */ 1112 /* XXX hack to workaround calling convention */ 1113 ieee80211_send_error(ni, wh->i_addr2, 1114 IEEE80211_FC0_SUBTYPE_AUTH, 1115 (seq + 1) | (estatus<<16)); 1116 } 1117 1118 /* 1119 * Convert a WPA cipher selector OUI to an internal 1120 * cipher algorithm. Where appropriate we also 1121 * record any key length. 1122 */ 1123 static int 1124 wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1125 { 1126 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1127 uint32_t w = LE_READ_4(sel); 1128 1129 switch (w) { 1130 case WPA_SEL(WPA_CSE_NULL): 1131 return IEEE80211_CIPHER_NONE; 1132 case WPA_SEL(WPA_CSE_WEP40): 1133 if (keylen) 1134 *keylen = 40 / NBBY; 1135 return IEEE80211_CIPHER_WEP; 1136 case WPA_SEL(WPA_CSE_WEP104): 1137 if (keylen) 1138 *keylen = 104 / NBBY; 1139 return IEEE80211_CIPHER_WEP; 1140 case WPA_SEL(WPA_CSE_TKIP): 1141 return IEEE80211_CIPHER_TKIP; 1142 case WPA_SEL(WPA_CSE_CCMP): 1143 return IEEE80211_CIPHER_AES_CCM; 1144 } 1145 return 32; /* NB: so 1<< is discarded */ 1146 #undef WPA_SEL 1147 } 1148 1149 /* 1150 * Convert a WPA key management/authentication algorithm 1151 * to an internal code. 1152 */ 1153 static int 1154 wpa_keymgmt(const uint8_t *sel) 1155 { 1156 #define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1157 uint32_t w = LE_READ_4(sel); 1158 1159 switch (w) { 1160 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1161 return WPA_ASE_8021X_UNSPEC; 1162 case WPA_SEL(WPA_ASE_8021X_PSK): 1163 return WPA_ASE_8021X_PSK; 1164 case WPA_SEL(WPA_ASE_NONE): 1165 return WPA_ASE_NONE; 1166 } 1167 return 0; /* NB: so is discarded */ 1168 #undef WPA_SEL 1169 } 1170 1171 /* 1172 * Parse a WPA information element to collect parameters. 1173 * Note that we do not validate security parameters; that 1174 * is handled by the authenticator; the parsing done here 1175 * is just for internal use in making operational decisions. 1176 */ 1177 static int 1178 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1179 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1180 { 1181 uint8_t len = frm[1]; 1182 uint32_t w; 1183 int n; 1184 1185 /* 1186 * Check the length once for fixed parts: OUI, type, 1187 * version, mcast cipher, and 2 selector counts. 1188 * Other, variable-length data, must be checked separately. 1189 */ 1190 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1191 IEEE80211_DISCARD_IE(vap, 1192 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1193 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1194 return IEEE80211_REASON_IE_INVALID; 1195 } 1196 if (len < 14) { 1197 IEEE80211_DISCARD_IE(vap, 1198 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1199 wh, "WPA", "too short, len %u", len); 1200 return IEEE80211_REASON_IE_INVALID; 1201 } 1202 frm += 6, len -= 4; /* NB: len is payload only */ 1203 /* NB: iswapoui already validated the OUI and type */ 1204 w = LE_READ_2(frm); 1205 if (w != WPA_VERSION) { 1206 IEEE80211_DISCARD_IE(vap, 1207 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1208 wh, "WPA", "bad version %u", w); 1209 return IEEE80211_REASON_IE_INVALID; 1210 } 1211 frm += 2, len -= 2; 1212 1213 memset(rsn, 0, sizeof(*rsn)); 1214 1215 /* multicast/group cipher */ 1216 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1217 frm += 4, len -= 4; 1218 1219 /* unicast ciphers */ 1220 n = LE_READ_2(frm); 1221 frm += 2, len -= 2; 1222 if (len < n*4+2) { 1223 IEEE80211_DISCARD_IE(vap, 1224 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1225 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1226 len, n); 1227 return IEEE80211_REASON_IE_INVALID; 1228 } 1229 w = 0; 1230 for (; n > 0; n--) { 1231 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1232 frm += 4, len -= 4; 1233 } 1234 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1235 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1236 else 1237 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1238 1239 /* key management algorithms */ 1240 n = LE_READ_2(frm); 1241 frm += 2, len -= 2; 1242 if (len < n*4) { 1243 IEEE80211_DISCARD_IE(vap, 1244 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1245 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1246 len, n); 1247 return IEEE80211_REASON_IE_INVALID; 1248 } 1249 w = 0; 1250 for (; n > 0; n--) { 1251 w |= wpa_keymgmt(frm); 1252 frm += 4, len -= 4; 1253 } 1254 if (w & WPA_ASE_8021X_UNSPEC) 1255 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1256 else 1257 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1258 1259 if (len > 2) /* optional capabilities */ 1260 rsn->rsn_caps = LE_READ_2(frm); 1261 1262 return 0; 1263 } 1264 1265 /* 1266 * Convert an RSN cipher selector OUI to an internal 1267 * cipher algorithm. Where appropriate we also 1268 * record any key length. 1269 */ 1270 static int 1271 rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1272 { 1273 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1274 uint32_t w = LE_READ_4(sel); 1275 1276 switch (w) { 1277 case RSN_SEL(RSN_CSE_NULL): 1278 return IEEE80211_CIPHER_NONE; 1279 case RSN_SEL(RSN_CSE_WEP40): 1280 if (keylen) 1281 *keylen = 40 / NBBY; 1282 return IEEE80211_CIPHER_WEP; 1283 case RSN_SEL(RSN_CSE_WEP104): 1284 if (keylen) 1285 *keylen = 104 / NBBY; 1286 return IEEE80211_CIPHER_WEP; 1287 case RSN_SEL(RSN_CSE_TKIP): 1288 return IEEE80211_CIPHER_TKIP; 1289 case RSN_SEL(RSN_CSE_CCMP): 1290 return IEEE80211_CIPHER_AES_CCM; 1291 case RSN_SEL(RSN_CSE_WRAP): 1292 return IEEE80211_CIPHER_AES_OCB; 1293 } 1294 return 32; /* NB: so 1<< is discarded */ 1295 #undef WPA_SEL 1296 } 1297 1298 /* 1299 * Convert an RSN key management/authentication algorithm 1300 * to an internal code. 1301 */ 1302 static int 1303 rsn_keymgmt(const uint8_t *sel) 1304 { 1305 #define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1306 uint32_t w = LE_READ_4(sel); 1307 1308 switch (w) { 1309 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1310 return RSN_ASE_8021X_UNSPEC; 1311 case RSN_SEL(RSN_ASE_8021X_PSK): 1312 return RSN_ASE_8021X_PSK; 1313 case RSN_SEL(RSN_ASE_NONE): 1314 return RSN_ASE_NONE; 1315 } 1316 return 0; /* NB: so is discarded */ 1317 #undef RSN_SEL 1318 } 1319 1320 /* 1321 * Parse a WPA/RSN information element to collect parameters 1322 * and validate the parameters against what has been 1323 * configured for the system. 1324 */ 1325 static int 1326 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1327 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1328 { 1329 uint8_t len = frm[1]; 1330 uint32_t w; 1331 int n; 1332 1333 /* 1334 * Check the length once for fixed parts: 1335 * version, mcast cipher, and 2 selector counts. 1336 * Other, variable-length data, must be checked separately. 1337 */ 1338 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1339 IEEE80211_DISCARD_IE(vap, 1340 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1341 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1342 return IEEE80211_REASON_IE_INVALID; 1343 } 1344 if (len < 10) { 1345 IEEE80211_DISCARD_IE(vap, 1346 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1347 wh, "RSN", "too short, len %u", len); 1348 return IEEE80211_REASON_IE_INVALID; 1349 } 1350 frm += 2; 1351 w = LE_READ_2(frm); 1352 if (w != RSN_VERSION) { 1353 IEEE80211_DISCARD_IE(vap, 1354 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1355 wh, "RSN", "bad version %u", w); 1356 return IEEE80211_REASON_IE_INVALID; 1357 } 1358 frm += 2, len -= 2; 1359 1360 memset(rsn, 0, sizeof(*rsn)); 1361 1362 /* multicast/group cipher */ 1363 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1364 frm += 4, len -= 4; 1365 1366 /* unicast ciphers */ 1367 n = LE_READ_2(frm); 1368 frm += 2, len -= 2; 1369 if (len < n*4+2) { 1370 IEEE80211_DISCARD_IE(vap, 1371 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1372 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1373 len, n); 1374 return IEEE80211_REASON_IE_INVALID; 1375 } 1376 w = 0; 1377 for (; n > 0; n--) { 1378 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1379 frm += 4, len -= 4; 1380 } 1381 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1382 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1383 else 1384 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1385 1386 /* key management algorithms */ 1387 n = LE_READ_2(frm); 1388 frm += 2, len -= 2; 1389 if (len < n*4) { 1390 IEEE80211_DISCARD_IE(vap, 1391 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1392 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1393 len, n); 1394 return IEEE80211_REASON_IE_INVALID; 1395 } 1396 w = 0; 1397 for (; n > 0; n--) { 1398 w |= rsn_keymgmt(frm); 1399 frm += 4, len -= 4; 1400 } 1401 if (w & RSN_ASE_8021X_UNSPEC) 1402 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1403 else 1404 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1405 1406 /* optional RSN capabilities */ 1407 if (len > 2) 1408 rsn->rsn_caps = LE_READ_2(frm); 1409 /* XXXPMKID */ 1410 1411 return 0; 1412 } 1413 1414 /* 1415 * WPA/802.11i assocation request processing. 1416 */ 1417 static int 1418 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1419 const struct ieee80211_frame *wh, const uint8_t *wpa, 1420 const uint8_t *rsn, uint16_t capinfo) 1421 { 1422 struct ieee80211vap *vap = ni->ni_vap; 1423 uint8_t reason; 1424 int badwparsn; 1425 1426 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1427 if (wpa == NULL && rsn == NULL) { 1428 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1429 /* 1430 * W-Fi Protected Setup (WPS) permits 1431 * clients to associate and pass EAPOL frames 1432 * to establish initial credentials. 1433 */ 1434 ni->ni_flags |= IEEE80211_NODE_WPS; 1435 return 1; 1436 } 1437 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1438 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1439 /* 1440 * Transitional Security Network. Permits clients 1441 * to associate and use WEP while WPA is configured. 1442 */ 1443 ni->ni_flags |= IEEE80211_NODE_TSN; 1444 return 1; 1445 } 1446 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1447 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1448 vap->iv_stats.is_rx_assoc_badwpaie++; 1449 reason = IEEE80211_REASON_IE_INVALID; 1450 goto bad; 1451 } 1452 /* assert right association security credentials */ 1453 badwparsn = 0; /* NB: to silence compiler */ 1454 switch (vap->iv_flags & IEEE80211_F_WPA) { 1455 case IEEE80211_F_WPA1: 1456 badwparsn = (wpa == NULL); 1457 break; 1458 case IEEE80211_F_WPA2: 1459 badwparsn = (rsn == NULL); 1460 break; 1461 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1462 badwparsn = (wpa == NULL && rsn == NULL); 1463 break; 1464 } 1465 if (badwparsn) { 1466 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1467 wh, NULL, 1468 "%s", "missing WPA/RSN IE in association request"); 1469 vap->iv_stats.is_rx_assoc_badwpaie++; 1470 reason = IEEE80211_REASON_IE_INVALID; 1471 goto bad; 1472 } 1473 /* 1474 * Parse WPA/RSN information element. 1475 */ 1476 if (wpa != NULL) 1477 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1478 else 1479 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1480 if (reason != 0) { 1481 /* XXX distinguish WPA/RSN? */ 1482 vap->iv_stats.is_rx_assoc_badwpaie++; 1483 goto bad; 1484 } 1485 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1486 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1487 wpa != NULL ? "WPA" : "RSN", 1488 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1489 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1490 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1491 1492 return 1; 1493 bad: 1494 ieee80211_node_deauth(ni, reason); 1495 return 0; 1496 } 1497 1498 /* XXX find a better place for definition */ 1499 struct l2_update_frame { 1500 struct ether_header eh; 1501 uint8_t dsap; 1502 uint8_t ssap; 1503 uint8_t control; 1504 uint8_t xid[3]; 1505 } __packed; 1506 1507 /* 1508 * Deliver a TGf L2UF frame on behalf of a station. 1509 * This primes any bridge when the station is roaming 1510 * between ap's on the same wired network. 1511 */ 1512 static void 1513 ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1514 { 1515 struct ieee80211vap *vap = ni->ni_vap; 1516 struct ifnet *ifp = vap->iv_ifp; 1517 struct mbuf *m; 1518 struct l2_update_frame *l2uf; 1519 struct ether_header *eh; 1520 1521 m = m_gethdr(M_NOWAIT, MT_DATA); 1522 if (m == NULL) { 1523 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1524 "%s", "no mbuf for l2uf frame"); 1525 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1526 return; 1527 } 1528 l2uf = mtod(m, struct l2_update_frame *); 1529 eh = &l2uf->eh; 1530 /* dst: Broadcast address */ 1531 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1532 /* src: associated STA */ 1533 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1534 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1535 1536 l2uf->dsap = 0; 1537 l2uf->ssap = 0; 1538 l2uf->control = 0xf5; 1539 l2uf->xid[0] = 0x81; 1540 l2uf->xid[1] = 0x80; 1541 l2uf->xid[2] = 0x00; 1542 1543 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1544 hostap_deliver_data(vap, ni, m); 1545 } 1546 1547 static void 1548 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1549 int reassoc, int resp, const char *tag, int rate) 1550 { 1551 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1552 "deny %s request, %s rate set mismatch, rate/MCS %d", 1553 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1554 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1555 ieee80211_node_leave(ni); 1556 } 1557 1558 static void 1559 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1560 int reassoc, int resp, const char *tag, int capinfo) 1561 { 1562 struct ieee80211vap *vap = ni->ni_vap; 1563 1564 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1565 "deny %s request, %s mismatch 0x%x", 1566 reassoc ? "reassoc" : "assoc", tag, capinfo); 1567 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1568 ieee80211_node_leave(ni); 1569 vap->iv_stats.is_rx_assoc_capmismatch++; 1570 } 1571 1572 static void 1573 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1574 int reassoc, int resp) 1575 { 1576 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1577 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1578 /* XXX no better code */ 1579 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_OTHER); 1580 ieee80211_node_leave(ni); 1581 } 1582 1583 static void 1584 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1585 int algo, int seq, int status) 1586 { 1587 struct ieee80211vap *vap = ni->ni_vap; 1588 1589 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1590 wh, NULL, "unsupported alg %d", algo); 1591 vap->iv_stats.is_rx_auth_unsupported++; 1592 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1593 seq | (status << 16)); 1594 } 1595 1596 static __inline int 1597 ishtmixed(const uint8_t *ie) 1598 { 1599 const struct ieee80211_ie_htinfo *ht = 1600 (const struct ieee80211_ie_htinfo *) ie; 1601 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1602 IEEE80211_HTINFO_OPMODE_MIXED; 1603 } 1604 1605 static int 1606 is11bclient(const uint8_t *rates, const uint8_t *xrates) 1607 { 1608 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1609 int i; 1610 1611 /* NB: the 11b clients we care about will not have xrates */ 1612 if (xrates != NULL || rates == NULL) 1613 return 0; 1614 for (i = 0; i < rates[1]; i++) { 1615 int r = rates[2+i] & IEEE80211_RATE_VAL; 1616 if (r > 2*11 || ((1<<r) & brates) == 0) 1617 return 0; 1618 } 1619 return 1; 1620 } 1621 1622 static void 1623 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1624 int subtype, int rssi, int nf) 1625 { 1626 struct ieee80211vap *vap = ni->ni_vap; 1627 struct ieee80211com *ic = ni->ni_ic; 1628 struct ieee80211_frame *wh; 1629 uint8_t *frm, *efrm, *sfrm; 1630 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1631 int reassoc, resp; 1632 uint8_t rate; 1633 1634 wh = mtod(m0, struct ieee80211_frame *); 1635 frm = (uint8_t *)&wh[1]; 1636 efrm = mtod(m0, uint8_t *) + m0->m_len; 1637 switch (subtype) { 1638 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1639 case IEEE80211_FC0_SUBTYPE_BEACON: { 1640 struct ieee80211_scanparams scan; 1641 /* 1642 * We process beacon/probe response frames when scanning; 1643 * otherwise we check beacon frames for overlapping non-ERP 1644 * BSS in 11g and/or overlapping legacy BSS when in HT. 1645 */ 1646 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1647 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1648 vap->iv_stats.is_rx_mgtdiscard++; 1649 return; 1650 } 1651 /* NB: accept off-channel frames */ 1652 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1653 return; 1654 /* 1655 * Count frame now that we know it's to be processed. 1656 */ 1657 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1658 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1659 IEEE80211_NODE_STAT(ni, rx_beacons); 1660 } else 1661 IEEE80211_NODE_STAT(ni, rx_proberesp); 1662 /* 1663 * If scanning, just pass information to the scan module. 1664 */ 1665 if (ic->ic_flags & IEEE80211_F_SCAN) { 1666 if (scan.status == 0 && /* NB: on channel */ 1667 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1668 /* 1669 * Actively scanning a channel marked passive; 1670 * send a probe request now that we know there 1671 * is 802.11 traffic present. 1672 * 1673 * XXX check if the beacon we recv'd gives 1674 * us what we need and suppress the probe req 1675 */ 1676 ieee80211_probe_curchan(vap, 1); 1677 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1678 } 1679 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 1680 return; 1681 } 1682 /* 1683 * Check beacon for overlapping bss w/ non ERP stations. 1684 * If we detect one and protection is configured but not 1685 * enabled, enable it and start a timer that'll bring us 1686 * out if we stop seeing the bss. 1687 */ 1688 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1689 scan.status == 0 && /* NB: on-channel */ 1690 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1691 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1692 ic->ic_lastnonerp = ticks; 1693 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1694 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1695 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1696 IEEE80211_NOTE_FRAME(vap, 1697 IEEE80211_MSG_ASSOC, wh, 1698 "non-ERP present on channel %d " 1699 "(saw erp 0x%x from channel %d), " 1700 "enable use of protection", 1701 ic->ic_curchan->ic_ieee, 1702 scan.erp, scan.chan); 1703 ic->ic_flags |= IEEE80211_F_USEPROT; 1704 ieee80211_notify_erp(ic); 1705 } 1706 } 1707 /* 1708 * Check beacon for non-HT station on HT channel 1709 * and update HT BSS occupancy as appropriate. 1710 */ 1711 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1712 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1713 /* 1714 * Off control channel; only check frames 1715 * that come in the extension channel when 1716 * operating w/ HT40. 1717 */ 1718 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1719 break; 1720 if (scan.chan != ic->ic_curchan->ic_extieee) 1721 break; 1722 } 1723 if (scan.htinfo == NULL) { 1724 ieee80211_htprot_update(ic, 1725 IEEE80211_HTINFO_OPMODE_PROTOPT | 1726 IEEE80211_HTINFO_NONHT_PRESENT); 1727 } else if (ishtmixed(scan.htinfo)) { 1728 /* XXX? take NONHT_PRESENT from beacon? */ 1729 ieee80211_htprot_update(ic, 1730 IEEE80211_HTINFO_OPMODE_MIXED | 1731 IEEE80211_HTINFO_NONHT_PRESENT); 1732 } 1733 } 1734 break; 1735 } 1736 1737 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1738 if (vap->iv_state != IEEE80211_S_RUN) { 1739 vap->iv_stats.is_rx_mgtdiscard++; 1740 return; 1741 } 1742 /* 1743 * prreq frame format 1744 * [tlv] ssid 1745 * [tlv] supported rates 1746 * [tlv] extended supported rates 1747 */ 1748 ssid = rates = xrates = NULL; 1749 sfrm = frm; 1750 while (efrm - frm > 1) { 1751 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1752 switch (*frm) { 1753 case IEEE80211_ELEMID_SSID: 1754 ssid = frm; 1755 break; 1756 case IEEE80211_ELEMID_RATES: 1757 rates = frm; 1758 break; 1759 case IEEE80211_ELEMID_XRATES: 1760 xrates = frm; 1761 break; 1762 } 1763 frm += frm[1] + 2; 1764 } 1765 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1766 if (xrates != NULL) 1767 IEEE80211_VERIFY_ELEMENT(xrates, 1768 IEEE80211_RATE_MAXSIZE - rates[1], return); 1769 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1770 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1771 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1772 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1773 wh, NULL, 1774 "%s", "no ssid with ssid suppression enabled"); 1775 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1776 return; 1777 } 1778 1779 /* XXX find a better class or define it's own */ 1780 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1781 "%s", "recv probe req"); 1782 /* 1783 * Some legacy 11b clients cannot hack a complete 1784 * probe response frame. When the request includes 1785 * only a bare-bones rate set, communicate this to 1786 * the transmit side. 1787 */ 1788 ieee80211_send_proberesp(vap, wh->i_addr2, 1789 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1790 break; 1791 1792 case IEEE80211_FC0_SUBTYPE_AUTH: { 1793 uint16_t algo, seq, status; 1794 1795 if (vap->iv_state != IEEE80211_S_RUN) { 1796 vap->iv_stats.is_rx_mgtdiscard++; 1797 return; 1798 } 1799 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1800 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1801 wh, NULL, "%s", "wrong bssid"); 1802 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1803 return; 1804 } 1805 /* 1806 * auth frame format 1807 * [2] algorithm 1808 * [2] sequence 1809 * [2] status 1810 * [tlv*] challenge 1811 */ 1812 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1813 algo = le16toh(*(uint16_t *)frm); 1814 seq = le16toh(*(uint16_t *)(frm + 2)); 1815 status = le16toh(*(uint16_t *)(frm + 4)); 1816 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1817 "recv auth frame with algorithm %d seq %d", algo, seq); 1818 /* 1819 * Consult the ACL policy module if setup. 1820 */ 1821 if (vap->iv_acl != NULL && 1822 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1823 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1824 wh, NULL, "%s", "disallowed by ACL"); 1825 vap->iv_stats.is_rx_acl++; 1826 ieee80211_send_error(ni, wh->i_addr2, 1827 IEEE80211_FC0_SUBTYPE_AUTH, 1828 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1829 return; 1830 } 1831 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1832 IEEE80211_DISCARD(vap, 1833 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1834 wh, NULL, "%s", "TKIP countermeasures enabled"); 1835 vap->iv_stats.is_rx_auth_countermeasures++; 1836 ieee80211_send_error(ni, wh->i_addr2, 1837 IEEE80211_FC0_SUBTYPE_AUTH, 1838 IEEE80211_REASON_MIC_FAILURE); 1839 return; 1840 } 1841 if (algo == IEEE80211_AUTH_ALG_SHARED) 1842 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf, 1843 seq, status); 1844 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1845 hostap_auth_open(ni, wh, rssi, nf, seq, status); 1846 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1847 authalgreject(ni, wh, algo, 1848 seq+1, IEEE80211_STATUS_ALG); 1849 return; 1850 } else { 1851 /* 1852 * We assume that an unknown algorithm is the result 1853 * of a decryption failure on a shared key auth frame; 1854 * return a status code appropriate for that instead 1855 * of IEEE80211_STATUS_ALG. 1856 * 1857 * NB: a seq# of 4 is intentional; the decrypted 1858 * frame likely has a bogus seq value. 1859 */ 1860 authalgreject(ni, wh, algo, 1861 4, IEEE80211_STATUS_CHALLENGE); 1862 return; 1863 } 1864 break; 1865 } 1866 1867 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1868 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1869 uint16_t capinfo, lintval; 1870 struct ieee80211_rsnparms rsnparms; 1871 1872 if (vap->iv_state != IEEE80211_S_RUN) { 1873 vap->iv_stats.is_rx_mgtdiscard++; 1874 return; 1875 } 1876 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1877 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1878 wh, NULL, "%s", "wrong bssid"); 1879 vap->iv_stats.is_rx_assoc_bss++; 1880 return; 1881 } 1882 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1883 reassoc = 1; 1884 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1885 } else { 1886 reassoc = 0; 1887 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1888 } 1889 if (ni == vap->iv_bss) { 1890 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1891 "deny %s request, sta not authenticated", 1892 reassoc ? "reassoc" : "assoc"); 1893 ieee80211_send_error(ni, wh->i_addr2, 1894 IEEE80211_FC0_SUBTYPE_DEAUTH, 1895 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1896 vap->iv_stats.is_rx_assoc_notauth++; 1897 return; 1898 } 1899 1900 /* 1901 * asreq frame format 1902 * [2] capability information 1903 * [2] listen interval 1904 * [6*] current AP address (reassoc only) 1905 * [tlv] ssid 1906 * [tlv] supported rates 1907 * [tlv] extended supported rates 1908 * [tlv] WPA or RSN 1909 * [tlv] HT capabilities 1910 * [tlv] Atheros capabilities 1911 */ 1912 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1913 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1914 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1915 if (reassoc) 1916 frm += 6; /* ignore current AP info */ 1917 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1918 sfrm = frm; 1919 while (efrm - frm > 1) { 1920 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1921 switch (*frm) { 1922 case IEEE80211_ELEMID_SSID: 1923 ssid = frm; 1924 break; 1925 case IEEE80211_ELEMID_RATES: 1926 rates = frm; 1927 break; 1928 case IEEE80211_ELEMID_XRATES: 1929 xrates = frm; 1930 break; 1931 case IEEE80211_ELEMID_RSN: 1932 rsn = frm; 1933 break; 1934 case IEEE80211_ELEMID_HTCAP: 1935 htcap = frm; 1936 break; 1937 case IEEE80211_ELEMID_VENDOR: 1938 if (iswpaoui(frm)) 1939 wpa = frm; 1940 else if (iswmeinfo(frm)) 1941 wme = frm; 1942 #ifdef IEEE80211_SUPPORT_SUPERG 1943 else if (isatherosoui(frm)) 1944 ath = frm; 1945 #endif 1946 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1947 if (ishtcapoui(frm) && htcap == NULL) 1948 htcap = frm; 1949 } 1950 break; 1951 } 1952 frm += frm[1] + 2; 1953 } 1954 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1955 if (xrates != NULL) 1956 IEEE80211_VERIFY_ELEMENT(xrates, 1957 IEEE80211_RATE_MAXSIZE - rates[1], return); 1958 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1959 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1960 if (htcap != NULL) { 1961 IEEE80211_VERIFY_LENGTH(htcap[1], 1962 htcap[0] == IEEE80211_ELEMID_VENDOR ? 1963 4 + sizeof(struct ieee80211_ie_htcap)-2 : 1964 sizeof(struct ieee80211_ie_htcap)-2, 1965 return); /* XXX just NULL out? */ 1966 } 1967 1968 if ((vap->iv_flags & IEEE80211_F_WPA) && 1969 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 1970 return; 1971 /* discard challenge after association */ 1972 if (ni->ni_challenge != NULL) { 1973 free(ni->ni_challenge, M_80211_NODE); 1974 ni->ni_challenge = NULL; 1975 } 1976 /* NB: 802.11 spec says to ignore station's privacy bit */ 1977 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 1978 capinfomismatch(ni, wh, reassoc, resp, 1979 "capability", capinfo); 1980 return; 1981 } 1982 /* 1983 * Disallow re-associate w/ invalid slot time setting. 1984 */ 1985 if (ni->ni_associd != 0 && 1986 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 1987 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 1988 capinfomismatch(ni, wh, reassoc, resp, 1989 "slot time", capinfo); 1990 return; 1991 } 1992 rate = ieee80211_setup_rates(ni, rates, xrates, 1993 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 1994 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 1995 if (rate & IEEE80211_RATE_BASIC) { 1996 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 1997 vap->iv_stats.is_rx_assoc_norate++; 1998 return; 1999 } 2000 /* 2001 * If constrained to 11g-only stations reject an 2002 * 11b-only station. We cheat a bit here by looking 2003 * at the max negotiated xmit rate and assuming anyone 2004 * with a best rate <24Mb/s is an 11b station. 2005 */ 2006 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2007 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2008 vap->iv_stats.is_rx_assoc_norate++; 2009 return; 2010 } 2011 /* 2012 * Do HT rate set handling and setup HT node state. 2013 */ 2014 ni->ni_chan = vap->iv_bss->ni_chan; 2015 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2016 rate = ieee80211_setup_htrates(ni, htcap, 2017 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2018 IEEE80211_F_DOBRS); 2019 if (rate & IEEE80211_RATE_BASIC) { 2020 ratesetmismatch(ni, wh, reassoc, resp, 2021 "HT", rate); 2022 vap->iv_stats.is_ht_assoc_norate++; 2023 return; 2024 } 2025 ieee80211_ht_node_init(ni); 2026 ieee80211_ht_updatehtcap(ni, htcap); 2027 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2028 ieee80211_ht_node_cleanup(ni); 2029 #ifdef IEEE80211_SUPPORT_SUPERG 2030 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH) 2031 ieee80211_ff_node_cleanup(ni); 2032 #endif 2033 /* 2034 * Allow AMPDU operation only with unencrypted traffic 2035 * or AES-CCM; the 11n spec only specifies these ciphers 2036 * so permitting any others is undefined and can lead 2037 * to interoperability problems. 2038 */ 2039 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2040 (((vap->iv_flags & IEEE80211_F_WPA) && 2041 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2042 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2043 IEEE80211_NOTE(vap, 2044 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2045 "disallow HT use because WEP or TKIP requested, " 2046 "capinfo 0x%x ucastcipher %d", capinfo, 2047 rsnparms.rsn_ucastcipher); 2048 ieee80211_ht_node_cleanup(ni); 2049 vap->iv_stats.is_ht_assoc_downgrade++; 2050 } 2051 /* 2052 * If constrained to 11n-only stations reject legacy stations. 2053 */ 2054 if ((vap->iv_flags_ext & IEEE80211_FEXT_PUREN) && 2055 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2056 htcapmismatch(ni, wh, reassoc, resp); 2057 vap->iv_stats.is_ht_assoc_nohtcap++; 2058 return; 2059 } 2060 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2061 ni->ni_noise = nf; 2062 ni->ni_intval = lintval; 2063 ni->ni_capinfo = capinfo; 2064 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2065 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2066 /* 2067 * Store the IEs. 2068 * XXX maybe better to just expand 2069 */ 2070 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2071 #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2072 if (wpa != NULL) 2073 setie(wpa_ie, wpa - sfrm); 2074 if (rsn != NULL) 2075 setie(rsn_ie, rsn - sfrm); 2076 if (htcap != NULL) 2077 setie(htcap_ie, htcap - sfrm); 2078 if (wme != NULL) { 2079 setie(wme_ie, wme - sfrm); 2080 /* 2081 * Mark node as capable of QoS. 2082 */ 2083 ni->ni_flags |= IEEE80211_NODE_QOS; 2084 } else 2085 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2086 #ifdef IEEE80211_SUPPORT_SUPERG 2087 if (ath != NULL) { 2088 setie(ath_ie, ath - sfrm); 2089 /* 2090 * Parse ATH station parameters. 2091 */ 2092 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2093 } else 2094 #endif 2095 ni->ni_ath_flags = 0; 2096 #undef setie 2097 } else { 2098 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2099 ni->ni_ath_flags = 0; 2100 } 2101 ieee80211_node_join(ni, resp); 2102 ieee80211_deliver_l2uf(ni); 2103 break; 2104 } 2105 2106 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2107 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2108 uint16_t reason; 2109 2110 if (vap->iv_state != IEEE80211_S_RUN || 2111 /* NB: can happen when in promiscuous mode */ 2112 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2113 vap->iv_stats.is_rx_mgtdiscard++; 2114 break; 2115 } 2116 /* 2117 * deauth/disassoc frame format 2118 * [2] reason 2119 */ 2120 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2121 reason = le16toh(*(uint16_t *)frm); 2122 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2123 vap->iv_stats.is_rx_deauth++; 2124 IEEE80211_NODE_STAT(ni, rx_deauth); 2125 } else { 2126 vap->iv_stats.is_rx_disassoc++; 2127 IEEE80211_NODE_STAT(ni, rx_disassoc); 2128 } 2129 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2130 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2131 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2132 if (ni != vap->iv_bss) 2133 ieee80211_node_leave(ni); 2134 break; 2135 } 2136 2137 case IEEE80211_FC0_SUBTYPE_ACTION: 2138 if (vap->iv_state == IEEE80211_S_RUN) { 2139 if (ieee80211_parse_action(ni, m0) == 0) 2140 ic->ic_recv_action(ni, frm, efrm); 2141 } else 2142 vap->iv_stats.is_rx_mgtdiscard++; 2143 break; 2144 2145 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2146 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2147 default: 2148 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2149 wh, "mgt", "subtype 0x%x not handled", subtype); 2150 vap->iv_stats.is_rx_badsubtype++; 2151 break; 2152 } 2153 } 2154 2155 static void 2156 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 2157 { 2158 switch (subtype) { 2159 case IEEE80211_FC0_SUBTYPE_PS_POLL: 2160 hostap_recv_pspoll(ni, m); 2161 break; 2162 case IEEE80211_FC0_SUBTYPE_BAR: 2163 ieee80211_recv_bar(ni, m); 2164 break; 2165 } 2166 } 2167 2168 /* 2169 * Process a received ps-poll frame. 2170 */ 2171 static void 2172 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2173 { 2174 struct ieee80211vap *vap = ni->ni_vap; 2175 struct ieee80211_frame_min *wh; 2176 struct ifnet *ifp; 2177 struct mbuf *m; 2178 uint16_t aid; 2179 int qlen; 2180 2181 wh = mtod(m0, struct ieee80211_frame_min *); 2182 if (ni->ni_associd == 0) { 2183 IEEE80211_DISCARD(vap, 2184 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2185 (struct ieee80211_frame *) wh, NULL, 2186 "%s", "unassociated station"); 2187 vap->iv_stats.is_ps_unassoc++; 2188 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2189 IEEE80211_REASON_NOT_ASSOCED); 2190 return; 2191 } 2192 2193 aid = le16toh(*(uint16_t *)wh->i_dur); 2194 if (aid != ni->ni_associd) { 2195 IEEE80211_DISCARD(vap, 2196 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2197 (struct ieee80211_frame *) wh, NULL, 2198 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2199 ni->ni_associd, aid); 2200 vap->iv_stats.is_ps_badaid++; 2201 /* 2202 * NB: We used to deauth the station but it turns out 2203 * the Blackberry Curve 8230 (and perhaps other devices) 2204 * sometimes send the wrong AID when WME is negotiated. 2205 * Being more lenient here seems ok as we already check 2206 * the station is associated and we only return frames 2207 * queued for the station (i.e. we don't use the AID). 2208 */ 2209 return; 2210 } 2211 2212 /* Okay, take the first queued packet and put it out... */ 2213 m = ieee80211_node_psq_dequeue(ni, &qlen); 2214 if (m == NULL) { 2215 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2216 "%s", "recv ps-poll, but queue empty"); 2217 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2218 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2219 if (vap->iv_set_tim != NULL) 2220 vap->iv_set_tim(ni, 0); /* just in case */ 2221 return; 2222 } 2223 /* 2224 * If there are more packets, set the more packets bit 2225 * in the packet dispatched to the station; otherwise 2226 * turn off the TIM bit. 2227 */ 2228 if (qlen != 0) { 2229 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2230 "recv ps-poll, send packet, %u still queued", qlen); 2231 m->m_flags |= M_MORE_DATA; 2232 } else { 2233 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2234 "%s", "recv ps-poll, send packet, queue empty"); 2235 if (vap->iv_set_tim != NULL) 2236 vap->iv_set_tim(ni, 0); 2237 } 2238 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2239 2240 if (m->m_flags & M_ENCAP) 2241 ifp = vap->iv_ic->ic_ifp; 2242 else 2243 ifp = vap->iv_ifp; 2244 IF_ENQUEUE(&ifp->if_snd, m); 2245 if_start(ifp); 2246 } 2247