ieee80211_hostap.c revision 185164
1/*- 2 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27#ifdef __FreeBSD__ 28__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_hostap.c 185164 2008-11-22 07:35:45Z kmacy $"); 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#include <net80211/ieee80211_wds.h> 61 62#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 63 64static void hostap_vattach(struct ieee80211vap *); 65static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int); 66static int hostap_input(struct ieee80211_node *ni, struct mbuf *m, 67 int rssi, int noise, uint32_t rstamp); 68static void hostap_deliver_data(struct ieee80211vap *, 69 struct ieee80211_node *, struct mbuf *); 70static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *, 71 int subtype, int rssi, int noise, uint32_t rstamp); 72static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *); 73 74void 75ieee80211_hostap_attach(struct ieee80211com *ic) 76{ 77 ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach; 78} 79 80void 81ieee80211_hostap_detach(struct ieee80211com *ic) 82{ 83} 84 85static void 86hostap_vdetach(struct ieee80211vap *vap) 87{ 88} 89 90static void 91hostap_vattach(struct ieee80211vap *vap) 92{ 93 vap->iv_newstate = hostap_newstate; 94 vap->iv_input = hostap_input; 95 vap->iv_recv_mgmt = hostap_recv_mgmt; 96 vap->iv_opdetach = hostap_vdetach; 97 vap->iv_deliver_data = hostap_deliver_data; 98} 99 100static void 101sta_disassoc(void *arg, struct ieee80211_node *ni) 102{ 103 struct ieee80211vap *vap = arg; 104 105 if (ni->ni_vap == vap && ni->ni_associd != 0) { 106 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC, 107 IEEE80211_REASON_ASSOC_LEAVE); 108 ieee80211_node_leave(ni); 109 } 110} 111 112/* 113 * IEEE80211_M_HOSTAP vap state machine handler. 114 */ 115static int 116hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 117{ 118 struct ieee80211com *ic = vap->iv_ic; 119 enum ieee80211_state ostate; 120 121 IEEE80211_LOCK_ASSERT(ic); 122 123 ostate = vap->iv_state; 124 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 125 __func__, ieee80211_state_name[ostate], 126 ieee80211_state_name[nstate], arg); 127 vap->iv_state = nstate; /* state transition */ 128 if (ostate != IEEE80211_S_SCAN) 129 ieee80211_cancel_scan(vap); /* background scan */ 130 switch (nstate) { 131 case IEEE80211_S_INIT: 132 switch (ostate) { 133 case IEEE80211_S_SCAN: 134 ieee80211_cancel_scan(vap); 135 break; 136 case IEEE80211_S_CAC: 137 ieee80211_dfs_cac_stop(vap); 138 break; 139 case IEEE80211_S_RUN: 140 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 141 break; 142 default: 143 break; 144 } 145 if (ostate != IEEE80211_S_INIT) { 146 /* NB: optimize INIT -> INIT case */ 147 ieee80211_reset_bss(vap); 148 } 149 if (vap->iv_auth->ia_detach != NULL) 150 vap->iv_auth->ia_detach(vap); 151 break; 152 case IEEE80211_S_SCAN: 153 switch (ostate) { 154 case IEEE80211_S_CSA: 155 case IEEE80211_S_RUN: 156 ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap); 157 /* 158 * Clear overlapping BSS state; the beacon frame 159 * will be reconstructed on transition to the RUN 160 * state and the timeout routines check if the flag 161 * is set before doing anything so this is sufficient. 162 */ 163 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR; 164 ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR; 165 /* fall thru... */ 166 case IEEE80211_S_CAC: 167 /* 168 * NB: We may get here because of a manual channel 169 * change in which case we need to stop CAC 170 * XXX no need to stop if ostate RUN but it's ok 171 */ 172 ieee80211_dfs_cac_stop(vap); 173 /* fall thru... */ 174 case IEEE80211_S_INIT: 175 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 176 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 177 /* 178 * Already have a channel; bypass the 179 * scan and startup immediately. 180 * ieee80211_create_ibss will call back to 181 * move us to RUN state. 182 */ 183 ieee80211_create_ibss(vap, vap->iv_des_chan); 184 break; 185 } 186 /* 187 * Initiate a scan. We can come here as a result 188 * of an IEEE80211_IOC_SCAN_REQ too in which case 189 * the vap will be marked with IEEE80211_FEXT_SCANREQ 190 * and the scan request parameters will be present 191 * in iv_scanreq. Otherwise we do the default. 192 */ 193 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 194 ieee80211_check_scan(vap, 195 vap->iv_scanreq_flags, 196 vap->iv_scanreq_duration, 197 vap->iv_scanreq_mindwell, 198 vap->iv_scanreq_maxdwell, 199 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 200 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 201 } else 202 ieee80211_check_scan_current(vap); 203 break; 204 case IEEE80211_S_SCAN: 205 /* 206 * A state change requires a reset; scan. 207 */ 208 ieee80211_check_scan_current(vap); 209 break; 210 default: 211 break; 212 } 213 break; 214 case IEEE80211_S_CAC: 215 /* 216 * Start CAC on a DFS channel. We come here when starting 217 * a bss on a DFS channel (see ieee80211_create_ibss). 218 */ 219 ieee80211_dfs_cac_start(vap); 220 break; 221 case IEEE80211_S_RUN: 222 if (vap->iv_flags & IEEE80211_F_WPA) { 223 /* XXX validate prerequisites */ 224 } 225 switch (ostate) { 226 case IEEE80211_S_INIT: 227 /* 228 * Already have a channel; bypass the 229 * scan and startup immediately. 230 * Note that ieee80211_create_ibss will call 231 * back to do a RUN->RUN state change. 232 */ 233 ieee80211_create_ibss(vap, 234 ieee80211_ht_adjust_channel(ic, 235 ic->ic_curchan, vap->iv_flags_ext)); 236 /* NB: iv_bss is changed on return */ 237 break; 238 case IEEE80211_S_CAC: 239 /* 240 * NB: This is the normal state change when CAC 241 * expires and no radar was detected; no need to 242 * clear the CAC timer as it's already expired. 243 */ 244 /* fall thru... */ 245 case IEEE80211_S_CSA: 246 /* 247 * Update bss node channel to reflect where 248 * we landed after CSA. 249 */ 250 ieee80211_node_set_chan(vap->iv_bss, 251 ieee80211_ht_adjust_channel(ic, ic->ic_curchan, 252 ieee80211_htchanflags(vap->iv_bss->ni_chan))); 253 /* XXX bypass debug msgs */ 254 break; 255 case IEEE80211_S_SCAN: 256 case IEEE80211_S_RUN: 257#ifdef IEEE80211_DEBUG 258 if (ieee80211_msg_debug(vap)) { 259 struct ieee80211_node *ni = vap->iv_bss; 260 ieee80211_note(vap, 261 "synchronized with %s ssid ", 262 ether_sprintf(ni->ni_bssid)); 263 ieee80211_print_essid(ni->ni_essid, 264 ni->ni_esslen); 265 /* XXX MCS/HT */ 266 printf(" channel %d start %uMb\n", 267 ieee80211_chan2ieee(ic, ic->ic_curchan), 268 IEEE80211_RATE2MBS(ni->ni_txrate)); 269 } 270#endif 271 break; 272 default: 273 break; 274 } 275 /* 276 * Start/stop the authenticator. We delay until here 277 * to allow configuration to happen out of order. 278 */ 279 if (vap->iv_auth->ia_attach != NULL) { 280 /* XXX check failure */ 281 vap->iv_auth->ia_attach(vap); 282 } else if (vap->iv_auth->ia_detach != NULL) { 283 vap->iv_auth->ia_detach(vap); 284 } 285 ieee80211_node_authorize(vap->iv_bss); 286 break; 287 default: 288 break; 289 } 290 return 0; 291} 292 293static void 294hostap_deliver_data(struct ieee80211vap *vap, 295 struct ieee80211_node *ni, struct mbuf *m) 296{ 297 struct ether_header *eh = mtod(m, struct ether_header *); 298 struct ifnet *ifp = vap->iv_ifp; 299 300 KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP, 301 ("gack, opmode %d", vap->iv_opmode)); 302 /* 303 * Do accounting. 304 */ 305 ifp->if_ipackets++; 306 IEEE80211_NODE_STAT(ni, rx_data); 307 IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); 308 if (ETHER_IS_MULTICAST(eh->ether_dhost)) { 309 m->m_flags |= M_MCAST; /* XXX M_BCAST? */ 310 IEEE80211_NODE_STAT(ni, rx_mcast); 311 } else 312 IEEE80211_NODE_STAT(ni, rx_ucast); 313 314 /* clear driver/net80211 flags before passing up */ 315 m->m_flags &= ~M_80211_RX; 316 317 /* perform as a bridge within the AP */ 318 if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) { 319 struct mbuf *mcopy = NULL; 320 321 if (m->m_flags & M_MCAST) { 322 mcopy = m_dup(m, M_DONTWAIT); 323 if (mcopy == NULL) 324 ifp->if_oerrors++; 325 else 326 mcopy->m_flags |= M_MCAST; 327 } else { 328 /* 329 * Check if the destination is associated with the 330 * same vap and authorized to receive traffic. 331 * Beware of traffic destined for the vap itself; 332 * sending it will not work; just let it be delivered 333 * normally. 334 */ 335 struct ieee80211_node *sta = ieee80211_find_vap_node( 336 &vap->iv_ic->ic_sta, vap, eh->ether_dhost); 337 if (sta != NULL) { 338 if (ieee80211_node_is_authorized(sta)) { 339 /* 340 * Beware of sending to ourself; this 341 * needs to happen via the normal 342 * input path. 343 */ 344 if (sta != vap->iv_bss) { 345 mcopy = m; 346 m = NULL; 347 } 348 } else { 349 vap->iv_stats.is_rx_unauth++; 350 IEEE80211_NODE_STAT(sta, rx_unauth); 351 } 352 ieee80211_free_node(sta); 353 } 354 } 355 if (mcopy != NULL) { 356 int len, err; 357 len = mcopy->m_pkthdr.len; 358 err = (ifp->if_transmit)(ifp, mcopy); 359 if (err) { 360 /* NB: IFQ_HANDOFF reclaims mcopy */ 361 } else { 362 ifp->if_opackets++; 363 } 364 } 365 } 366 if (m != NULL) { 367 /* 368 * Mark frame as coming from vap's interface. 369 */ 370 m->m_pkthdr.rcvif = ifp; 371 if (m->m_flags & M_MCAST) { 372 /* 373 * Spam DWDS vap's w/ multicast traffic. 374 */ 375 /* XXX only if dwds in use? */ 376 ieee80211_dwds_mcast(vap, m); 377 } 378 if (ni->ni_vlan != 0) { 379 /* attach vlan tag */ 380 m->m_pkthdr.ether_vtag = ni->ni_vlan; 381 m->m_flags |= M_VLANTAG; 382 } 383 ifp->if_input(ifp, m); 384 } 385} 386 387/* 388 * Decide if a received management frame should be 389 * printed when debugging is enabled. This filters some 390 * of the less interesting frames that come frequently 391 * (e.g. beacons). 392 */ 393static __inline int 394doprint(struct ieee80211vap *vap, int subtype) 395{ 396 switch (subtype) { 397 case IEEE80211_FC0_SUBTYPE_BEACON: 398 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 399 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 400 return 0; 401 } 402 return 1; 403} 404 405/* 406 * Process a received frame. The node associated with the sender 407 * should be supplied. If nothing was found in the node table then 408 * the caller is assumed to supply a reference to iv_bss instead. 409 * The RSSI and a timestamp are also supplied. The RSSI data is used 410 * during AP scanning to select a AP to associate with; it can have 411 * any units so long as values have consistent units and higher values 412 * mean ``better signal''. The receive timestamp is currently not used 413 * by the 802.11 layer. 414 */ 415static int 416hostap_input(struct ieee80211_node *ni, struct mbuf *m, 417 int rssi, int noise, uint32_t rstamp) 418{ 419#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 420#define HAS_SEQ(type) ((type & 0x4) == 0) 421 struct ieee80211vap *vap = ni->ni_vap; 422 struct ieee80211com *ic = ni->ni_ic; 423 struct ifnet *ifp = vap->iv_ifp; 424 struct ieee80211_frame *wh; 425 struct ieee80211_key *key; 426 struct ether_header *eh; 427 int hdrspace, need_tap; 428 uint8_t dir, type, subtype, qos; 429 uint8_t *bssid; 430 uint16_t rxseq; 431 432 if (m->m_flags & M_AMPDU_MPDU) { 433 /* 434 * Fastpath for A-MPDU reorder q resubmission. Frames 435 * w/ M_AMPDU_MPDU marked have already passed through 436 * here but were received out of order and been held on 437 * the reorder queue. When resubmitted they are marked 438 * with the M_AMPDU_MPDU flag and we can bypass most of 439 * the normal processing. 440 */ 441 wh = mtod(m, struct ieee80211_frame *); 442 type = IEEE80211_FC0_TYPE_DATA; 443 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 444 subtype = IEEE80211_FC0_SUBTYPE_QOS; 445 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 446 goto resubmit_ampdu; 447 } 448 449 KASSERT(ni != NULL, ("null node")); 450 ni->ni_inact = ni->ni_inact_reload; 451 452 need_tap = 1; /* mbuf need to be tapped. */ 453 type = -1; /* undefined */ 454 455 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 456 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 457 ni->ni_macaddr, NULL, 458 "too short (1): len %u", m->m_pkthdr.len); 459 vap->iv_stats.is_rx_tooshort++; 460 goto out; 461 } 462 /* 463 * Bit of a cheat here, we use a pointer for a 3-address 464 * frame format but don't reference fields past outside 465 * ieee80211_frame_min w/o first validating the data is 466 * present. 467 */ 468 wh = mtod(m, struct ieee80211_frame *); 469 470 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 471 IEEE80211_FC0_VERSION_0) { 472 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 473 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 474 vap->iv_stats.is_rx_badversion++; 475 goto err; 476 } 477 478 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 479 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 480 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 481 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 482 if (dir != IEEE80211_FC1_DIR_NODS) 483 bssid = wh->i_addr1; 484 else if (type == IEEE80211_FC0_TYPE_CTL) 485 bssid = wh->i_addr1; 486 else { 487 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 488 IEEE80211_DISCARD_MAC(vap, 489 IEEE80211_MSG_ANY, ni->ni_macaddr, 490 NULL, "too short (2): len %u", 491 m->m_pkthdr.len); 492 vap->iv_stats.is_rx_tooshort++; 493 goto out; 494 } 495 bssid = wh->i_addr3; 496 } 497 /* 498 * Validate the bssid. 499 */ 500 if (!(type == IEEE80211_FC0_TYPE_MGT && 501 subtype == IEEE80211_FC0_SUBTYPE_BEACON) && 502 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 503 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 504 /* not interested in */ 505 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 506 bssid, NULL, "%s", "not to bss"); 507 vap->iv_stats.is_rx_wrongbss++; 508 goto out; 509 } 510 511 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 512 ni->ni_noise = noise; 513 ni->ni_rstamp = rstamp; 514 if (HAS_SEQ(type)) { 515 uint8_t tid = ieee80211_gettid(wh); 516 if (IEEE80211_QOS_HAS_SEQ(wh) && 517 TID_TO_WME_AC(tid) >= WME_AC_VI) 518 ic->ic_wme.wme_hipri_traffic++; 519 rxseq = le16toh(*(uint16_t *)wh->i_seq); 520 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 521 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 522 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 523 /* duplicate, discard */ 524 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 525 bssid, "duplicate", 526 "seqno <%u,%u> fragno <%u,%u> tid %u", 527 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 528 ni->ni_rxseqs[tid] >> 529 IEEE80211_SEQ_SEQ_SHIFT, 530 rxseq & IEEE80211_SEQ_FRAG_MASK, 531 ni->ni_rxseqs[tid] & 532 IEEE80211_SEQ_FRAG_MASK, 533 tid); 534 vap->iv_stats.is_rx_dup++; 535 IEEE80211_NODE_STAT(ni, rx_dup); 536 goto out; 537 } 538 ni->ni_rxseqs[tid] = rxseq; 539 } 540 } 541 542 switch (type) { 543 case IEEE80211_FC0_TYPE_DATA: 544 hdrspace = ieee80211_hdrspace(ic, wh); 545 if (m->m_len < hdrspace && 546 (m = m_pullup(m, hdrspace)) == NULL) { 547 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 548 ni->ni_macaddr, NULL, 549 "data too short: expecting %u", hdrspace); 550 vap->iv_stats.is_rx_tooshort++; 551 goto out; /* XXX */ 552 } 553 if (!(dir == IEEE80211_FC1_DIR_TODS || 554 (dir == IEEE80211_FC1_DIR_DSTODS && 555 (vap->iv_flags & IEEE80211_F_DWDS)))) { 556 if (dir != IEEE80211_FC1_DIR_DSTODS) { 557 IEEE80211_DISCARD(vap, 558 IEEE80211_MSG_INPUT, wh, "data", 559 "incorrect dir 0x%x", dir); 560 } else { 561 IEEE80211_DISCARD(vap, 562 IEEE80211_MSG_INPUT | 563 IEEE80211_MSG_WDS, wh, 564 "4-address data", 565 "%s", "DWDS not enabled"); 566 } 567 vap->iv_stats.is_rx_wrongdir++; 568 goto out; 569 } 570 /* check if source STA is associated */ 571 if (ni == vap->iv_bss) { 572 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 573 wh, "data", "%s", "unknown src"); 574 ieee80211_send_error(ni, wh->i_addr2, 575 IEEE80211_FC0_SUBTYPE_DEAUTH, 576 IEEE80211_REASON_NOT_AUTHED); 577 vap->iv_stats.is_rx_notassoc++; 578 goto err; 579 } 580 if (ni->ni_associd == 0) { 581 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 582 wh, "data", "%s", "unassoc src"); 583 IEEE80211_SEND_MGMT(ni, 584 IEEE80211_FC0_SUBTYPE_DISASSOC, 585 IEEE80211_REASON_NOT_ASSOCED); 586 vap->iv_stats.is_rx_notassoc++; 587 goto err; 588 } 589 590 /* 591 * Check for power save state change. 592 * XXX out-of-order A-MPDU frames? 593 */ 594 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ 595 (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) 596 ieee80211_node_pwrsave(ni, 597 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); 598 /* 599 * For 4-address packets handle WDS discovery 600 * notifications. Once a WDS link is setup frames 601 * are just delivered to the WDS vap (see below). 602 */ 603 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) { 604 if (!ieee80211_node_is_authorized(ni)) { 605 IEEE80211_DISCARD(vap, 606 IEEE80211_MSG_INPUT | 607 IEEE80211_MSG_WDS, wh, 608 "4-address data", 609 "%s", "unauthorized port"); 610 vap->iv_stats.is_rx_unauth++; 611 IEEE80211_NODE_STAT(ni, rx_unauth); 612 goto err; 613 } 614 ieee80211_dwds_discover(ni, m); 615 return type; 616 } 617 618 /* 619 * Handle A-MPDU re-ordering. If the frame is to be 620 * processed directly then ieee80211_ampdu_reorder 621 * will return 0; otherwise it has consumed the mbuf 622 * and we should do nothing more with it. 623 */ 624 if ((m->m_flags & M_AMPDU) && 625 ieee80211_ampdu_reorder(ni, m) != 0) { 626 m = NULL; 627 goto out; 628 } 629 resubmit_ampdu: 630 631 /* 632 * Handle privacy requirements. Note that we 633 * must not be preempted from here until after 634 * we (potentially) call ieee80211_crypto_demic; 635 * otherwise we may violate assumptions in the 636 * crypto cipher modules used to do delayed update 637 * of replay sequence numbers. 638 */ 639 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 640 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 641 /* 642 * Discard encrypted frames when privacy is off. 643 */ 644 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 645 wh, "WEP", "%s", "PRIVACY off"); 646 vap->iv_stats.is_rx_noprivacy++; 647 IEEE80211_NODE_STAT(ni, rx_noprivacy); 648 goto out; 649 } 650 key = ieee80211_crypto_decap(ni, m, hdrspace); 651 if (key == NULL) { 652 /* NB: stats+msgs handled in crypto_decap */ 653 IEEE80211_NODE_STAT(ni, rx_wepfail); 654 goto out; 655 } 656 wh = mtod(m, struct ieee80211_frame *); 657 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 658 } else { 659 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 660 key = NULL; 661 } 662 663 /* 664 * Save QoS bits for use below--before we strip the header. 665 */ 666 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 667 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 668 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 669 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 670 } else 671 qos = 0; 672 673 /* 674 * Next up, any fragmentation. 675 */ 676 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 677 m = ieee80211_defrag(ni, m, hdrspace); 678 if (m == NULL) { 679 /* Fragment dropped or frame not complete yet */ 680 goto out; 681 } 682 } 683 wh = NULL; /* no longer valid, catch any uses */ 684 685 /* 686 * Next strip any MSDU crypto bits. 687 */ 688 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 689 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 690 ni->ni_macaddr, "data", "%s", "demic error"); 691 vap->iv_stats.is_rx_demicfail++; 692 IEEE80211_NODE_STAT(ni, rx_demicfail); 693 goto out; 694 } 695 /* copy to listener after decrypt */ 696 if (bpf_peers_present(vap->iv_rawbpf)) 697 bpf_mtap(vap->iv_rawbpf, m); 698 need_tap = 0; 699 /* 700 * Finally, strip the 802.11 header. 701 */ 702 m = ieee80211_decap(vap, m, hdrspace); 703 if (m == NULL) { 704 /* XXX mask bit to check for both */ 705 /* don't count Null data frames as errors */ 706 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 707 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 708 goto out; 709 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 710 ni->ni_macaddr, "data", "%s", "decap error"); 711 vap->iv_stats.is_rx_decap++; 712 IEEE80211_NODE_STAT(ni, rx_decap); 713 goto err; 714 } 715 eh = mtod(m, struct ether_header *); 716 if (!ieee80211_node_is_authorized(ni)) { 717 /* 718 * Deny any non-PAE frames received prior to 719 * authorization. For open/shared-key 720 * authentication the port is mark authorized 721 * after authentication completes. For 802.1x 722 * the port is not marked authorized by the 723 * authenticator until the handshake has completed. 724 */ 725 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 726 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 727 eh->ether_shost, "data", 728 "unauthorized port: ether type 0x%x len %u", 729 eh->ether_type, m->m_pkthdr.len); 730 vap->iv_stats.is_rx_unauth++; 731 IEEE80211_NODE_STAT(ni, rx_unauth); 732 goto err; 733 } 734 } else { 735 /* 736 * When denying unencrypted frames, discard 737 * any non-PAE frames received without encryption. 738 */ 739 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 740 (key == NULL && (m->m_flags & M_WEP) == 0) && 741 eh->ether_type != htons(ETHERTYPE_PAE)) { 742 /* 743 * Drop unencrypted frames. 744 */ 745 vap->iv_stats.is_rx_unencrypted++; 746 IEEE80211_NODE_STAT(ni, rx_unencrypted); 747 goto out; 748 } 749 } 750 /* XXX require HT? */ 751 if (qos & IEEE80211_QOS_AMSDU) { 752 m = ieee80211_decap_amsdu(ni, m); 753 if (m == NULL) 754 return IEEE80211_FC0_TYPE_DATA; 755 } else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) && 756#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 757 m->m_pkthdr.len >= 3*FF_LLC_SIZE) { 758 struct llc *llc; 759 760 /* 761 * Check for fast-frame tunnel encapsulation. 762 */ 763 if (m->m_len < FF_LLC_SIZE && 764 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 765 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 766 ni->ni_macaddr, "fast-frame", 767 "%s", "m_pullup(llc) failed"); 768 vap->iv_stats.is_rx_tooshort++; 769 return IEEE80211_FC0_TYPE_DATA; 770 } 771 llc = (struct llc *)(mtod(m, uint8_t *) + 772 sizeof(struct ether_header)); 773 if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { 774 m_adj(m, FF_LLC_SIZE); 775 m = ieee80211_decap_fastframe(ni, m); 776 if (m == NULL) 777 return IEEE80211_FC0_TYPE_DATA; 778 } 779 } 780#undef FF_LLC_SIZE 781 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 782 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 783 else 784 hostap_deliver_data(vap, ni, m); 785 return IEEE80211_FC0_TYPE_DATA; 786 787 case IEEE80211_FC0_TYPE_MGT: 788 vap->iv_stats.is_rx_mgmt++; 789 IEEE80211_NODE_STAT(ni, rx_mgmt); 790 if (dir != IEEE80211_FC1_DIR_NODS) { 791 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 792 wh, "mgt", "incorrect dir 0x%x", dir); 793 vap->iv_stats.is_rx_wrongdir++; 794 goto err; 795 } 796 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 797 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 798 ni->ni_macaddr, "mgt", "too short: len %u", 799 m->m_pkthdr.len); 800 vap->iv_stats.is_rx_tooshort++; 801 goto out; 802 } 803 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 804 /* ensure return frames are unicast */ 805 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 806 wh, NULL, "source is multicast: %s", 807 ether_sprintf(wh->i_addr2)); 808 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 809 goto out; 810 } 811#ifdef IEEE80211_DEBUG 812 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 813 ieee80211_msg_dumppkts(vap)) { 814 if_printf(ifp, "received %s from %s rssi %d\n", 815 ieee80211_mgt_subtype_name[subtype >> 816 IEEE80211_FC0_SUBTYPE_SHIFT], 817 ether_sprintf(wh->i_addr2), rssi); 818 } 819#endif 820 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 821 if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { 822 /* 823 * Only shared key auth frames with a challenge 824 * should be encrypted, discard all others. 825 */ 826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 827 wh, NULL, 828 "%s", "WEP set but not permitted"); 829 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 830 goto out; 831 } 832 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 833 /* 834 * Discard encrypted frames when privacy is off. 835 */ 836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 837 wh, NULL, "%s", "WEP set but PRIVACY off"); 838 vap->iv_stats.is_rx_noprivacy++; 839 goto out; 840 } 841 hdrspace = ieee80211_hdrspace(ic, wh); 842 key = ieee80211_crypto_decap(ni, m, hdrspace); 843 if (key == NULL) { 844 /* NB: stats+msgs handled in crypto_decap */ 845 goto out; 846 } 847 wh = mtod(m, struct ieee80211_frame *); 848 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 849 } 850 if (bpf_peers_present(vap->iv_rawbpf)) 851 bpf_mtap(vap->iv_rawbpf, m); 852 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 853 m_freem(m); 854 return IEEE80211_FC0_TYPE_MGT; 855 856 case IEEE80211_FC0_TYPE_CTL: 857 vap->iv_stats.is_rx_ctl++; 858 IEEE80211_NODE_STAT(ni, rx_ctrl); 859 switch (subtype) { 860 case IEEE80211_FC0_SUBTYPE_PS_POLL: 861 hostap_recv_pspoll(ni, m); 862 break; 863 case IEEE80211_FC0_SUBTYPE_BAR: 864 ieee80211_recv_bar(ni, m); 865 break; 866 } 867 goto out; 868 default: 869 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 870 wh, "bad", "frame type 0x%x", type); 871 /* should not come here */ 872 break; 873 } 874err: 875 ifp->if_ierrors++; 876out: 877 if (m != NULL) { 878 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 879 bpf_mtap(vap->iv_rawbpf, m); 880 m_freem(m); 881 } 882 return type; 883#undef SEQ_LEQ 884} 885 886static void 887hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh, 888 int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) 889{ 890 struct ieee80211vap *vap = ni->ni_vap; 891 892 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 893 894 if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { 895 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 896 ni->ni_macaddr, "open auth", 897 "bad sta auth mode %u", ni->ni_authmode); 898 vap->iv_stats.is_rx_bad_auth++; /* XXX */ 899 /* 900 * Clear any challenge text that may be there if 901 * a previous shared key auth failed and then an 902 * open auth is attempted. 903 */ 904 if (ni->ni_challenge != NULL) { 905 FREE(ni->ni_challenge, M_80211_NODE); 906 ni->ni_challenge = NULL; 907 } 908 /* XXX hack to workaround calling convention */ 909 ieee80211_send_error(ni, wh->i_addr2, 910 IEEE80211_FC0_SUBTYPE_AUTH, 911 (seq + 1) | (IEEE80211_STATUS_ALG<<16)); 912 return; 913 } 914 if (seq != IEEE80211_AUTH_OPEN_REQUEST) { 915 vap->iv_stats.is_rx_bad_auth++; 916 return; 917 } 918 /* always accept open authentication requests */ 919 if (ni == vap->iv_bss) { 920 ni = ieee80211_dup_bss(vap, wh->i_addr2); 921 if (ni == NULL) 922 return; 923 } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 924 (void) ieee80211_ref_node(ni); 925 /* 926 * Mark the node as referenced to reflect that it's 927 * reference count has been bumped to insure it remains 928 * after the transaction completes. 929 */ 930 ni->ni_flags |= IEEE80211_NODE_AREF; 931 932 if (vap->iv_acl != NULL && 933 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 934 /* 935 * When the ACL policy is set to RADIUS we defer the 936 * authorization to a user agent. Dispatch an event, 937 * a subsequent MLME call will decide the fate of the 938 * station. If the user agent is not present then the 939 * node will be reclaimed due to inactivity. 940 */ 941 IEEE80211_NOTE_MAC(vap, 942 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr, 943 "%s", "station authentication defered (radius acl)"); 944 ieee80211_notify_node_auth(ni); 945 } else { 946 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 947 IEEE80211_NOTE_MAC(vap, 948 IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr, 949 "%s", "station authenticated (open)"); 950 /* 951 * When 802.1x is not in use mark the port 952 * authorized at this point so traffic can flow. 953 */ 954 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 955 ieee80211_node_authorize(ni); 956 } 957} 958 959static void 960hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh, 961 uint8_t *frm, uint8_t *efrm, int rssi, int noise, uint32_t rstamp, 962 uint16_t seq, uint16_t status) 963{ 964 struct ieee80211vap *vap = ni->ni_vap; 965 uint8_t *challenge; 966 int allocbs, estatus; 967 968 KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state)); 969 970 /* 971 * NB: this can happen as we allow pre-shared key 972 * authentication to be enabled w/o wep being turned 973 * on so that configuration of these can be done 974 * in any order. It may be better to enforce the 975 * ordering in which case this check would just be 976 * for sanity/consistency. 977 */ 978 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 979 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 980 ni->ni_macaddr, "shared key auth", 981 "%s", " PRIVACY is disabled"); 982 estatus = IEEE80211_STATUS_ALG; 983 goto bad; 984 } 985 /* 986 * Pre-shared key authentication is evil; accept 987 * it only if explicitly configured (it is supported 988 * mainly for compatibility with clients like Mac OS X). 989 */ 990 if (ni->ni_authmode != IEEE80211_AUTH_AUTO && 991 ni->ni_authmode != IEEE80211_AUTH_SHARED) { 992 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 993 ni->ni_macaddr, "shared key auth", 994 "bad sta auth mode %u", ni->ni_authmode); 995 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ 996 estatus = IEEE80211_STATUS_ALG; 997 goto bad; 998 } 999 1000 challenge = NULL; 1001 if (frm + 1 < efrm) { 1002 if ((frm[1] + 2) > (efrm - frm)) { 1003 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1004 ni->ni_macaddr, "shared key auth", 1005 "ie %d/%d too long", 1006 frm[0], (frm[1] + 2) - (efrm - frm)); 1007 vap->iv_stats.is_rx_bad_auth++; 1008 estatus = IEEE80211_STATUS_CHALLENGE; 1009 goto bad; 1010 } 1011 if (*frm == IEEE80211_ELEMID_CHALLENGE) 1012 challenge = frm; 1013 frm += frm[1] + 2; 1014 } 1015 switch (seq) { 1016 case IEEE80211_AUTH_SHARED_CHALLENGE: 1017 case IEEE80211_AUTH_SHARED_RESPONSE: 1018 if (challenge == NULL) { 1019 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1020 ni->ni_macaddr, "shared key auth", 1021 "%s", "no challenge"); 1022 vap->iv_stats.is_rx_bad_auth++; 1023 estatus = IEEE80211_STATUS_CHALLENGE; 1024 goto bad; 1025 } 1026 if (challenge[1] != IEEE80211_CHALLENGE_LEN) { 1027 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1028 ni->ni_macaddr, "shared key auth", 1029 "bad challenge len %d", challenge[1]); 1030 vap->iv_stats.is_rx_bad_auth++; 1031 estatus = IEEE80211_STATUS_CHALLENGE; 1032 goto bad; 1033 } 1034 default: 1035 break; 1036 } 1037 switch (seq) { 1038 case IEEE80211_AUTH_SHARED_REQUEST: 1039 if (ni == vap->iv_bss) { 1040 ni = ieee80211_dup_bss(vap, wh->i_addr2); 1041 if (ni == NULL) { 1042 /* NB: no way to return an error */ 1043 return; 1044 } 1045 allocbs = 1; 1046 } else { 1047 if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) 1048 (void) ieee80211_ref_node(ni); 1049 allocbs = 0; 1050 } 1051 /* 1052 * Mark the node as referenced to reflect that it's 1053 * reference count has been bumped to insure it remains 1054 * after the transaction completes. 1055 */ 1056 ni->ni_flags |= IEEE80211_NODE_AREF; 1057 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 1058 ni->ni_noise = noise; 1059 ni->ni_rstamp = rstamp; 1060 if (!ieee80211_alloc_challenge(ni)) { 1061 /* NB: don't return error so they rexmit */ 1062 return; 1063 } 1064 get_random_bytes(ni->ni_challenge, 1065 IEEE80211_CHALLENGE_LEN); 1066 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1067 ni, "shared key %sauth request", allocbs ? "" : "re"); 1068 /* 1069 * When the ACL policy is set to RADIUS we defer the 1070 * authorization to a user agent. Dispatch an event, 1071 * a subsequent MLME call will decide the fate of the 1072 * station. If the user agent is not present then the 1073 * node will be reclaimed due to inactivity. 1074 */ 1075 if (vap->iv_acl != NULL && 1076 vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) { 1077 IEEE80211_NOTE_MAC(vap, 1078 IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, 1079 ni->ni_macaddr, 1080 "%s", "station authentication defered (radius acl)"); 1081 ieee80211_notify_node_auth(ni); 1082 return; 1083 } 1084 break; 1085 case IEEE80211_AUTH_SHARED_RESPONSE: 1086 if (ni == vap->iv_bss) { 1087 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1088 ni->ni_macaddr, "shared key response", 1089 "%s", "unknown station"); 1090 /* NB: don't send a response */ 1091 return; 1092 } 1093 if (ni->ni_challenge == NULL) { 1094 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1095 ni->ni_macaddr, "shared key response", 1096 "%s", "no challenge recorded"); 1097 vap->iv_stats.is_rx_bad_auth++; 1098 estatus = IEEE80211_STATUS_CHALLENGE; 1099 goto bad; 1100 } 1101 if (memcmp(ni->ni_challenge, &challenge[2], 1102 challenge[1]) != 0) { 1103 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1104 ni->ni_macaddr, "shared key response", 1105 "%s", "challenge mismatch"); 1106 vap->iv_stats.is_rx_auth_fail++; 1107 estatus = IEEE80211_STATUS_CHALLENGE; 1108 goto bad; 1109 } 1110 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, 1111 ni, "%s", "station authenticated (shared key)"); 1112 ieee80211_node_authorize(ni); 1113 break; 1114 default: 1115 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH, 1116 ni->ni_macaddr, "shared key auth", 1117 "bad seq %d", seq); 1118 vap->iv_stats.is_rx_bad_auth++; 1119 estatus = IEEE80211_STATUS_SEQUENCE; 1120 goto bad; 1121 } 1122 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); 1123 return; 1124bad: 1125 /* 1126 * Send an error response; but only when operating as an AP. 1127 */ 1128 /* XXX hack to workaround calling convention */ 1129 ieee80211_send_error(ni, wh->i_addr2, 1130 IEEE80211_FC0_SUBTYPE_AUTH, 1131 (seq + 1) | (estatus<<16)); 1132} 1133 1134/* 1135 * Convert a WPA cipher selector OUI to an internal 1136 * cipher algorithm. Where appropriate we also 1137 * record any key length. 1138 */ 1139static int 1140wpa_cipher(const uint8_t *sel, uint8_t *keylen) 1141{ 1142#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1143 uint32_t w = LE_READ_4(sel); 1144 1145 switch (w) { 1146 case WPA_SEL(WPA_CSE_NULL): 1147 return IEEE80211_CIPHER_NONE; 1148 case WPA_SEL(WPA_CSE_WEP40): 1149 if (keylen) 1150 *keylen = 40 / NBBY; 1151 return IEEE80211_CIPHER_WEP; 1152 case WPA_SEL(WPA_CSE_WEP104): 1153 if (keylen) 1154 *keylen = 104 / NBBY; 1155 return IEEE80211_CIPHER_WEP; 1156 case WPA_SEL(WPA_CSE_TKIP): 1157 return IEEE80211_CIPHER_TKIP; 1158 case WPA_SEL(WPA_CSE_CCMP): 1159 return IEEE80211_CIPHER_AES_CCM; 1160 } 1161 return 32; /* NB: so 1<< is discarded */ 1162#undef WPA_SEL 1163} 1164 1165/* 1166 * Convert a WPA key management/authentication algorithm 1167 * to an internal code. 1168 */ 1169static int 1170wpa_keymgmt(const uint8_t *sel) 1171{ 1172#define WPA_SEL(x) (((x)<<24)|WPA_OUI) 1173 uint32_t w = LE_READ_4(sel); 1174 1175 switch (w) { 1176 case WPA_SEL(WPA_ASE_8021X_UNSPEC): 1177 return WPA_ASE_8021X_UNSPEC; 1178 case WPA_SEL(WPA_ASE_8021X_PSK): 1179 return WPA_ASE_8021X_PSK; 1180 case WPA_SEL(WPA_ASE_NONE): 1181 return WPA_ASE_NONE; 1182 } 1183 return 0; /* NB: so is discarded */ 1184#undef WPA_SEL 1185} 1186 1187/* 1188 * Parse a WPA information element to collect parameters. 1189 * Note that we do not validate security parameters; that 1190 * is handled by the authenticator; the parsing done here 1191 * is just for internal use in making operational decisions. 1192 */ 1193static int 1194ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm, 1195 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1196{ 1197 uint8_t len = frm[1]; 1198 uint32_t w; 1199 int n; 1200 1201 /* 1202 * Check the length once for fixed parts: OUI, type, 1203 * version, mcast cipher, and 2 selector counts. 1204 * Other, variable-length data, must be checked separately. 1205 */ 1206 if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) { 1207 IEEE80211_DISCARD_IE(vap, 1208 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1209 wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags); 1210 return IEEE80211_REASON_IE_INVALID; 1211 } 1212 if (len < 14) { 1213 IEEE80211_DISCARD_IE(vap, 1214 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1215 wh, "WPA", "too short, len %u", len); 1216 return IEEE80211_REASON_IE_INVALID; 1217 } 1218 frm += 6, len -= 4; /* NB: len is payload only */ 1219 /* NB: iswapoui already validated the OUI and type */ 1220 w = LE_READ_2(frm); 1221 if (w != WPA_VERSION) { 1222 IEEE80211_DISCARD_IE(vap, 1223 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1224 wh, "WPA", "bad version %u", w); 1225 return IEEE80211_REASON_IE_INVALID; 1226 } 1227 frm += 2, len -= 2; 1228 1229 memset(rsn, 0, sizeof(*rsn)); 1230 1231 /* multicast/group cipher */ 1232 rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen); 1233 frm += 4, len -= 4; 1234 1235 /* unicast ciphers */ 1236 n = LE_READ_2(frm); 1237 frm += 2, len -= 2; 1238 if (len < n*4+2) { 1239 IEEE80211_DISCARD_IE(vap, 1240 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1241 wh, "WPA", "ucast cipher data too short; len %u, n %u", 1242 len, n); 1243 return IEEE80211_REASON_IE_INVALID; 1244 } 1245 w = 0; 1246 for (; n > 0; n--) { 1247 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); 1248 frm += 4, len -= 4; 1249 } 1250 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1251 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1252 else 1253 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1254 1255 /* key management algorithms */ 1256 n = LE_READ_2(frm); 1257 frm += 2, len -= 2; 1258 if (len < n*4) { 1259 IEEE80211_DISCARD_IE(vap, 1260 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1261 wh, "WPA", "key mgmt alg data too short; len %u, n %u", 1262 len, n); 1263 return IEEE80211_REASON_IE_INVALID; 1264 } 1265 w = 0; 1266 for (; n > 0; n--) { 1267 w |= wpa_keymgmt(frm); 1268 frm += 4, len -= 4; 1269 } 1270 if (w & WPA_ASE_8021X_UNSPEC) 1271 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; 1272 else 1273 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; 1274 1275 if (len > 2) /* optional capabilities */ 1276 rsn->rsn_caps = LE_READ_2(frm); 1277 1278 return 0; 1279} 1280 1281/* 1282 * Convert an RSN cipher selector OUI to an internal 1283 * cipher algorithm. Where appropriate we also 1284 * record any key length. 1285 */ 1286static int 1287rsn_cipher(const uint8_t *sel, uint8_t *keylen) 1288{ 1289#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1290 uint32_t w = LE_READ_4(sel); 1291 1292 switch (w) { 1293 case RSN_SEL(RSN_CSE_NULL): 1294 return IEEE80211_CIPHER_NONE; 1295 case RSN_SEL(RSN_CSE_WEP40): 1296 if (keylen) 1297 *keylen = 40 / NBBY; 1298 return IEEE80211_CIPHER_WEP; 1299 case RSN_SEL(RSN_CSE_WEP104): 1300 if (keylen) 1301 *keylen = 104 / NBBY; 1302 return IEEE80211_CIPHER_WEP; 1303 case RSN_SEL(RSN_CSE_TKIP): 1304 return IEEE80211_CIPHER_TKIP; 1305 case RSN_SEL(RSN_CSE_CCMP): 1306 return IEEE80211_CIPHER_AES_CCM; 1307 case RSN_SEL(RSN_CSE_WRAP): 1308 return IEEE80211_CIPHER_AES_OCB; 1309 } 1310 return 32; /* NB: so 1<< is discarded */ 1311#undef WPA_SEL 1312} 1313 1314/* 1315 * Convert an RSN key management/authentication algorithm 1316 * to an internal code. 1317 */ 1318static int 1319rsn_keymgmt(const uint8_t *sel) 1320{ 1321#define RSN_SEL(x) (((x)<<24)|RSN_OUI) 1322 uint32_t w = LE_READ_4(sel); 1323 1324 switch (w) { 1325 case RSN_SEL(RSN_ASE_8021X_UNSPEC): 1326 return RSN_ASE_8021X_UNSPEC; 1327 case RSN_SEL(RSN_ASE_8021X_PSK): 1328 return RSN_ASE_8021X_PSK; 1329 case RSN_SEL(RSN_ASE_NONE): 1330 return RSN_ASE_NONE; 1331 } 1332 return 0; /* NB: so is discarded */ 1333#undef RSN_SEL 1334} 1335 1336/* 1337 * Parse a WPA/RSN information element to collect parameters 1338 * and validate the parameters against what has been 1339 * configured for the system. 1340 */ 1341static int 1342ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm, 1343 struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) 1344{ 1345 uint8_t len = frm[1]; 1346 uint32_t w; 1347 int n; 1348 1349 /* 1350 * Check the length once for fixed parts: 1351 * version, mcast cipher, and 2 selector counts. 1352 * Other, variable-length data, must be checked separately. 1353 */ 1354 if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) { 1355 IEEE80211_DISCARD_IE(vap, 1356 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1357 wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags); 1358 return IEEE80211_REASON_IE_INVALID; 1359 } 1360 if (len < 10) { 1361 IEEE80211_DISCARD_IE(vap, 1362 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1363 wh, "RSN", "too short, len %u", len); 1364 return IEEE80211_REASON_IE_INVALID; 1365 } 1366 frm += 2; 1367 w = LE_READ_2(frm); 1368 if (w != RSN_VERSION) { 1369 IEEE80211_DISCARD_IE(vap, 1370 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1371 wh, "RSN", "bad version %u", w); 1372 return IEEE80211_REASON_IE_INVALID; 1373 } 1374 frm += 2, len -= 2; 1375 1376 memset(rsn, 0, sizeof(*rsn)); 1377 1378 /* multicast/group cipher */ 1379 rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen); 1380 frm += 4, len -= 4; 1381 1382 /* unicast ciphers */ 1383 n = LE_READ_2(frm); 1384 frm += 2, len -= 2; 1385 if (len < n*4+2) { 1386 IEEE80211_DISCARD_IE(vap, 1387 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1388 wh, "RSN", "ucast cipher data too short; len %u, n %u", 1389 len, n); 1390 return IEEE80211_REASON_IE_INVALID; 1391 } 1392 w = 0; 1393 for (; n > 0; n--) { 1394 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); 1395 frm += 4, len -= 4; 1396 } 1397 if (w & (1<<IEEE80211_CIPHER_TKIP)) 1398 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; 1399 else 1400 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; 1401 1402 /* key management algorithms */ 1403 n = LE_READ_2(frm); 1404 frm += 2, len -= 2; 1405 if (len < n*4) { 1406 IEEE80211_DISCARD_IE(vap, 1407 IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, 1408 wh, "RSN", "key mgmt alg data too short; len %u, n %u", 1409 len, n); 1410 return IEEE80211_REASON_IE_INVALID; 1411 } 1412 w = 0; 1413 for (; n > 0; n--) { 1414 w |= rsn_keymgmt(frm); 1415 frm += 4, len -= 4; 1416 } 1417 if (w & RSN_ASE_8021X_UNSPEC) 1418 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; 1419 else 1420 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; 1421 1422 /* optional RSN capabilities */ 1423 if (len > 2) 1424 rsn->rsn_caps = LE_READ_2(frm); 1425 /* XXXPMKID */ 1426 1427 return 0; 1428} 1429 1430/* 1431 * WPA/802.11i assocation request processing. 1432 */ 1433static int 1434wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms, 1435 const struct ieee80211_frame *wh, const uint8_t *wpa, 1436 const uint8_t *rsn, uint16_t capinfo) 1437{ 1438 struct ieee80211vap *vap = ni->ni_vap; 1439 uint8_t reason; 1440 int badwparsn; 1441 1442 ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN); 1443 if (wpa == NULL && rsn == NULL) { 1444 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) { 1445 /* 1446 * W-Fi Protected Setup (WPS) permits 1447 * clients to associate and pass EAPOL frames 1448 * to establish initial credentials. 1449 */ 1450 ni->ni_flags |= IEEE80211_NODE_WPS; 1451 return 1; 1452 } 1453 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) && 1454 (capinfo & IEEE80211_CAPINFO_PRIVACY)) { 1455 /* 1456 * Transitional Security Network. Permits clients 1457 * to associate and use WEP while WPA is configured. 1458 */ 1459 ni->ni_flags |= IEEE80211_NODE_TSN; 1460 return 1; 1461 } 1462 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1463 wh, NULL, "%s", "no WPA/RSN IE in association request"); 1464 vap->iv_stats.is_rx_assoc_badwpaie++; 1465 reason = IEEE80211_REASON_IE_INVALID; 1466 goto bad; 1467 } 1468 /* assert right association security credentials */ 1469 badwparsn = 0; /* NB: to silence compiler */ 1470 switch (vap->iv_flags & IEEE80211_F_WPA) { 1471 case IEEE80211_F_WPA1: 1472 badwparsn = (wpa == NULL); 1473 break; 1474 case IEEE80211_F_WPA2: 1475 badwparsn = (rsn == NULL); 1476 break; 1477 case IEEE80211_F_WPA1|IEEE80211_F_WPA2: 1478 badwparsn = (wpa == NULL && rsn == NULL); 1479 break; 1480 } 1481 if (badwparsn) { 1482 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, 1483 wh, NULL, 1484 "%s", "missing WPA/RSN IE in association request"); 1485 vap->iv_stats.is_rx_assoc_badwpaie++; 1486 reason = IEEE80211_REASON_IE_INVALID; 1487 goto bad; 1488 } 1489 /* 1490 * Parse WPA/RSN information element. 1491 */ 1492 if (wpa != NULL) 1493 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh); 1494 else 1495 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh); 1496 if (reason != 0) { 1497 /* XXX distinguish WPA/RSN? */ 1498 vap->iv_stats.is_rx_assoc_badwpaie++; 1499 goto bad; 1500 } 1501 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni, 1502 "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x", 1503 wpa != NULL ? "WPA" : "RSN", 1504 rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen, 1505 rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen, 1506 rsnparms->rsn_keymgmt, rsnparms->rsn_caps); 1507 1508 return 1; 1509bad: 1510 ieee80211_node_deauth(ni, reason); 1511 return 0; 1512} 1513 1514/* XXX find a better place for definition */ 1515struct l2_update_frame { 1516 struct ether_header eh; 1517 uint8_t dsap; 1518 uint8_t ssap; 1519 uint8_t control; 1520 uint8_t xid[3]; 1521} __packed; 1522 1523/* 1524 * Deliver a TGf L2UF frame on behalf of a station. 1525 * This primes any bridge when the station is roaming 1526 * between ap's on the same wired network. 1527 */ 1528static void 1529ieee80211_deliver_l2uf(struct ieee80211_node *ni) 1530{ 1531 struct ieee80211vap *vap = ni->ni_vap; 1532 struct ifnet *ifp = vap->iv_ifp; 1533 struct mbuf *m; 1534 struct l2_update_frame *l2uf; 1535 struct ether_header *eh; 1536 1537 m = m_gethdr(M_NOWAIT, MT_DATA); 1538 if (m == NULL) { 1539 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni, 1540 "%s", "no mbuf for l2uf frame"); 1541 vap->iv_stats.is_rx_nobuf++; /* XXX not right */ 1542 return; 1543 } 1544 l2uf = mtod(m, struct l2_update_frame *); 1545 eh = &l2uf->eh; 1546 /* dst: Broadcast address */ 1547 IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); 1548 /* src: associated STA */ 1549 IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); 1550 eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); 1551 1552 l2uf->dsap = 0; 1553 l2uf->ssap = 0; 1554 l2uf->control = 0xf5; 1555 l2uf->xid[0] = 0x81; 1556 l2uf->xid[1] = 0x80; 1557 l2uf->xid[2] = 0x00; 1558 1559 m->m_pkthdr.len = m->m_len = sizeof(*l2uf); 1560 hostap_deliver_data(vap, ni, m); 1561} 1562 1563static void 1564ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1565 int reassoc, int resp, const char *tag, int rate) 1566{ 1567 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1568 "deny %s request, %s rate set mismatch, rate/MCS %d", 1569 reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL); 1570 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE); 1571 ieee80211_node_leave(ni); 1572} 1573 1574static void 1575capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1576 int reassoc, int resp, const char *tag, int capinfo) 1577{ 1578 struct ieee80211vap *vap = ni->ni_vap; 1579 1580 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1581 "deny %s request, %s mismatch 0x%x", 1582 reassoc ? "reassoc" : "assoc", tag, capinfo); 1583 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO); 1584 ieee80211_node_leave(ni); 1585 vap->iv_stats.is_rx_assoc_capmismatch++; 1586} 1587 1588static void 1589htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1590 int reassoc, int resp) 1591{ 1592 IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2, 1593 "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); 1594 /* XXX no better code */ 1595 IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_OTHER); 1596 ieee80211_node_leave(ni); 1597} 1598 1599static void 1600authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh, 1601 int algo, int seq, int status) 1602{ 1603 struct ieee80211vap *vap = ni->ni_vap; 1604 1605 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1606 wh, NULL, "unsupported alg %d", algo); 1607 vap->iv_stats.is_rx_auth_unsupported++; 1608 ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, 1609 seq | (status << 16)); 1610} 1611 1612static __inline int 1613ishtmixed(const uint8_t *ie) 1614{ 1615 const struct ieee80211_ie_htinfo *ht = 1616 (const struct ieee80211_ie_htinfo *) ie; 1617 return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) == 1618 IEEE80211_HTINFO_OPMODE_MIXED; 1619} 1620 1621static int 1622is11bclient(const uint8_t *rates, const uint8_t *xrates) 1623{ 1624 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 1625 int i; 1626 1627 /* NB: the 11b clients we care about will not have xrates */ 1628 if (xrates != NULL || rates == NULL) 1629 return 0; 1630 for (i = 0; i < rates[1]; i++) { 1631 int r = rates[2+i] & IEEE80211_RATE_VAL; 1632 if (r > 2*11 || ((1<<r) & brates) == 0) 1633 return 0; 1634 } 1635 return 1; 1636} 1637 1638static void 1639hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1640 int subtype, int rssi, int noise, uint32_t rstamp) 1641{ 1642 struct ieee80211vap *vap = ni->ni_vap; 1643 struct ieee80211com *ic = ni->ni_ic; 1644 struct ieee80211_frame *wh; 1645 uint8_t *frm, *efrm, *sfrm; 1646 uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap; 1647 int reassoc, resp; 1648 uint8_t rate; 1649 1650 wh = mtod(m0, struct ieee80211_frame *); 1651 frm = (uint8_t *)&wh[1]; 1652 efrm = mtod(m0, uint8_t *) + m0->m_len; 1653 switch (subtype) { 1654 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1655 case IEEE80211_FC0_SUBTYPE_BEACON: { 1656 struct ieee80211_scanparams scan; 1657 /* 1658 * We process beacon/probe response frames when scanning; 1659 * otherwise we check beacon frames for overlapping non-ERP 1660 * BSS in 11g and/or overlapping legacy BSS when in HT. 1661 */ 1662 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 && 1663 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) { 1664 vap->iv_stats.is_rx_mgtdiscard++; 1665 return; 1666 } 1667 /* NB: accept off-channel frames */ 1668 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN) 1669 return; 1670 /* 1671 * Count frame now that we know it's to be processed. 1672 */ 1673 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 1674 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 1675 IEEE80211_NODE_STAT(ni, rx_beacons); 1676 } else 1677 IEEE80211_NODE_STAT(ni, rx_proberesp); 1678 /* 1679 * If scanning, just pass information to the scan module. 1680 */ 1681 if (ic->ic_flags & IEEE80211_F_SCAN) { 1682 if (scan.status == 0 && /* NB: on channel */ 1683 (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) { 1684 /* 1685 * Actively scanning a channel marked passive; 1686 * send a probe request now that we know there 1687 * is 802.11 traffic present. 1688 * 1689 * XXX check if the beacon we recv'd gives 1690 * us what we need and suppress the probe req 1691 */ 1692 ieee80211_probe_curchan(vap, 1); 1693 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 1694 } 1695 ieee80211_add_scan(vap, &scan, wh, 1696 subtype, rssi, noise, rstamp); 1697 return; 1698 } 1699 /* 1700 * Check beacon for overlapping bss w/ non ERP stations. 1701 * If we detect one and protection is configured but not 1702 * enabled, enable it and start a timer that'll bring us 1703 * out if we stop seeing the bss. 1704 */ 1705 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 1706 scan.status == 0 && /* NB: on-channel */ 1707 ((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/ 1708 (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) { 1709 ic->ic_lastnonerp = ticks; 1710 ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR; 1711 if (ic->ic_protmode != IEEE80211_PROT_NONE && 1712 (ic->ic_flags & IEEE80211_F_USEPROT) == 0) { 1713 IEEE80211_NOTE_FRAME(vap, 1714 IEEE80211_MSG_ASSOC, wh, 1715 "non-ERP present on channel %d " 1716 "(saw erp 0x%x from channel %d), " 1717 "enable use of protection", 1718 ic->ic_curchan->ic_ieee, 1719 scan.erp, scan.chan); 1720 ic->ic_flags |= IEEE80211_F_USEPROT; 1721 ieee80211_notify_erp(ic); 1722 } 1723 } 1724 /* 1725 * Check beacon for non-HT station on HT channel 1726 * and update HT BSS occupancy as appropriate. 1727 */ 1728 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) { 1729 if (scan.status & IEEE80211_BPARSE_OFFCHAN) { 1730 /* 1731 * Off control channel; only check frames 1732 * that come in the extension channel when 1733 * operating w/ HT40. 1734 */ 1735 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan)) 1736 break; 1737 if (scan.chan != ic->ic_curchan->ic_extieee) 1738 break; 1739 } 1740 if (scan.htinfo == NULL) { 1741 ieee80211_htprot_update(ic, 1742 IEEE80211_HTINFO_OPMODE_PROTOPT | 1743 IEEE80211_HTINFO_NONHT_PRESENT); 1744 } else if (ishtmixed(scan.htinfo)) { 1745 /* XXX? take NONHT_PRESENT from beacon? */ 1746 ieee80211_htprot_update(ic, 1747 IEEE80211_HTINFO_OPMODE_MIXED | 1748 IEEE80211_HTINFO_NONHT_PRESENT); 1749 } 1750 } 1751 break; 1752 } 1753 1754 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1755 if (vap->iv_state != IEEE80211_S_RUN) { 1756 vap->iv_stats.is_rx_mgtdiscard++; 1757 return; 1758 } 1759 /* 1760 * prreq frame format 1761 * [tlv] ssid 1762 * [tlv] supported rates 1763 * [tlv] extended supported rates 1764 */ 1765 ssid = rates = xrates = NULL; 1766 sfrm = frm; 1767 while (efrm - frm > 1) { 1768 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1769 switch (*frm) { 1770 case IEEE80211_ELEMID_SSID: 1771 ssid = frm; 1772 break; 1773 case IEEE80211_ELEMID_RATES: 1774 rates = frm; 1775 break; 1776 case IEEE80211_ELEMID_XRATES: 1777 xrates = frm; 1778 break; 1779 } 1780 frm += frm[1] + 2; 1781 } 1782 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1783 if (xrates != NULL) 1784 IEEE80211_VERIFY_ELEMENT(xrates, 1785 IEEE80211_RATE_MAXSIZE - rates[1], return); 1786 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1787 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1788 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 1789 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1790 wh, NULL, 1791 "%s", "no ssid with ssid suppression enabled"); 1792 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 1793 return; 1794 } 1795 1796 /* XXX find a better class or define it's own */ 1797 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 1798 "%s", "recv probe req"); 1799 /* 1800 * Some legacy 11b clients cannot hack a complete 1801 * probe response frame. When the request includes 1802 * only a bare-bones rate set, communicate this to 1803 * the transmit side. 1804 */ 1805 ieee80211_send_proberesp(vap, wh->i_addr2, 1806 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 1807 break; 1808 1809 case IEEE80211_FC0_SUBTYPE_AUTH: { 1810 uint16_t algo, seq, status; 1811 1812 if (vap->iv_state != IEEE80211_S_RUN) { 1813 vap->iv_stats.is_rx_mgtdiscard++; 1814 return; 1815 } 1816 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1817 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1818 wh, NULL, "%s", "wrong bssid"); 1819 vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/ 1820 return; 1821 } 1822 /* 1823 * auth frame format 1824 * [2] algorithm 1825 * [2] sequence 1826 * [2] status 1827 * [tlv*] challenge 1828 */ 1829 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); 1830 algo = le16toh(*(uint16_t *)frm); 1831 seq = le16toh(*(uint16_t *)(frm + 2)); 1832 status = le16toh(*(uint16_t *)(frm + 4)); 1833 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2, 1834 "recv auth frame with algorithm %d seq %d", algo, seq); 1835 /* 1836 * Consult the ACL policy module if setup. 1837 */ 1838 if (vap->iv_acl != NULL && 1839 !vap->iv_acl->iac_check(vap, wh->i_addr2)) { 1840 IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL, 1841 wh, NULL, "%s", "disallowed by ACL"); 1842 vap->iv_stats.is_rx_acl++; 1843 ieee80211_send_error(ni, wh->i_addr2, 1844 IEEE80211_FC0_SUBTYPE_AUTH, 1845 (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); 1846 return; 1847 } 1848 if (vap->iv_flags & IEEE80211_F_COUNTERM) { 1849 IEEE80211_DISCARD(vap, 1850 IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, 1851 wh, NULL, "%s", "TKIP countermeasures enabled"); 1852 vap->iv_stats.is_rx_auth_countermeasures++; 1853 ieee80211_send_error(ni, wh->i_addr2, 1854 IEEE80211_FC0_SUBTYPE_AUTH, 1855 IEEE80211_REASON_MIC_FAILURE); 1856 return; 1857 } 1858 if (algo == IEEE80211_AUTH_ALG_SHARED) 1859 hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, 1860 noise, rstamp, seq, status); 1861 else if (algo == IEEE80211_AUTH_ALG_OPEN) 1862 hostap_auth_open(ni, wh, rssi, noise, rstamp, 1863 seq, status); 1864 else if (algo == IEEE80211_AUTH_ALG_LEAP) { 1865 authalgreject(ni, wh, algo, 1866 seq+1, IEEE80211_STATUS_ALG); 1867 return; 1868 } else { 1869 /* 1870 * We assume that an unknown algorithm is the result 1871 * of a decryption failure on a shared key auth frame; 1872 * return a status code appropriate for that instead 1873 * of IEEE80211_STATUS_ALG. 1874 * 1875 * NB: a seq# of 4 is intentional; the decrypted 1876 * frame likely has a bogus seq value. 1877 */ 1878 authalgreject(ni, wh, algo, 1879 4, IEEE80211_STATUS_CHALLENGE); 1880 return; 1881 } 1882 break; 1883 } 1884 1885 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1886 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { 1887 uint16_t capinfo, lintval; 1888 struct ieee80211_rsnparms rsnparms; 1889 1890 if (vap->iv_state != IEEE80211_S_RUN) { 1891 vap->iv_stats.is_rx_mgtdiscard++; 1892 return; 1893 } 1894 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) { 1895 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1896 wh, NULL, "%s", "wrong bssid"); 1897 vap->iv_stats.is_rx_assoc_bss++; 1898 return; 1899 } 1900 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 1901 reassoc = 1; 1902 resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; 1903 } else { 1904 reassoc = 0; 1905 resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; 1906 } 1907 if (ni == vap->iv_bss) { 1908 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2, 1909 "deny %s request, sta not authenticated", 1910 reassoc ? "reassoc" : "assoc"); 1911 ieee80211_send_error(ni, wh->i_addr2, 1912 IEEE80211_FC0_SUBTYPE_DEAUTH, 1913 IEEE80211_REASON_ASSOC_NOT_AUTHED); 1914 vap->iv_stats.is_rx_assoc_notauth++; 1915 return; 1916 } 1917 1918 /* 1919 * asreq frame format 1920 * [2] capability information 1921 * [2] listen interval 1922 * [6*] current AP address (reassoc only) 1923 * [tlv] ssid 1924 * [tlv] supported rates 1925 * [tlv] extended supported rates 1926 * [tlv] WPA or RSN 1927 * [tlv] HT capabilities 1928 * [tlv] Atheros capabilities 1929 */ 1930 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); 1931 capinfo = le16toh(*(uint16_t *)frm); frm += 2; 1932 lintval = le16toh(*(uint16_t *)frm); frm += 2; 1933 if (reassoc) 1934 frm += 6; /* ignore current AP info */ 1935 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; 1936 sfrm = frm; 1937 while (efrm - frm > 1) { 1938 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 1939 switch (*frm) { 1940 case IEEE80211_ELEMID_SSID: 1941 ssid = frm; 1942 break; 1943 case IEEE80211_ELEMID_RATES: 1944 rates = frm; 1945 break; 1946 case IEEE80211_ELEMID_XRATES: 1947 xrates = frm; 1948 break; 1949 case IEEE80211_ELEMID_RSN: 1950 rsn = frm; 1951 break; 1952 case IEEE80211_ELEMID_HTCAP: 1953 htcap = frm; 1954 break; 1955 case IEEE80211_ELEMID_VENDOR: 1956 if (iswpaoui(frm)) 1957 wpa = frm; 1958 else if (iswmeinfo(frm)) 1959 wme = frm; 1960 else if (isatherosoui(frm)) 1961 ath = frm; 1962 else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) { 1963 if (ishtcapoui(frm) && htcap == NULL) 1964 htcap = frm; 1965 } 1966 break; 1967 } 1968 frm += frm[1] + 2; 1969 } 1970 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 1971 if (xrates != NULL) 1972 IEEE80211_VERIFY_ELEMENT(xrates, 1973 IEEE80211_RATE_MAXSIZE - rates[1], return); 1974 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 1975 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 1976 if (htcap != NULL) { 1977 IEEE80211_VERIFY_LENGTH(htcap[1], 1978 htcap[0] == IEEE80211_ELEMID_VENDOR ? 1979 4 + sizeof(struct ieee80211_ie_htcap)-2 : 1980 sizeof(struct ieee80211_ie_htcap)-2, 1981 return); /* XXX just NULL out? */ 1982 } 1983 1984 if ((vap->iv_flags & IEEE80211_F_WPA) && 1985 !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo)) 1986 return; 1987 /* discard challenge after association */ 1988 if (ni->ni_challenge != NULL) { 1989 FREE(ni->ni_challenge, M_80211_NODE); 1990 ni->ni_challenge = NULL; 1991 } 1992 /* NB: 802.11 spec says to ignore station's privacy bit */ 1993 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { 1994 capinfomismatch(ni, wh, reassoc, resp, 1995 "capability", capinfo); 1996 return; 1997 } 1998 /* 1999 * Disallow re-associate w/ invalid slot time setting. 2000 */ 2001 if (ni->ni_associd != 0 && 2002 IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && 2003 ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { 2004 capinfomismatch(ni, wh, reassoc, resp, 2005 "slot time", capinfo); 2006 return; 2007 } 2008 rate = ieee80211_setup_rates(ni, rates, xrates, 2009 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | 2010 IEEE80211_F_DONEGO | IEEE80211_F_DODEL); 2011 if (rate & IEEE80211_RATE_BASIC) { 2012 ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate); 2013 vap->iv_stats.is_rx_assoc_norate++; 2014 return; 2015 } 2016 /* 2017 * If constrained to 11g-only stations reject an 2018 * 11b-only station. We cheat a bit here by looking 2019 * at the max negotiated xmit rate and assuming anyone 2020 * with a best rate <24Mb/s is an 11b station. 2021 */ 2022 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) { 2023 ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); 2024 vap->iv_stats.is_rx_assoc_norate++; 2025 return; 2026 } 2027 /* 2028 * Do HT rate set handling and setup HT node state. 2029 */ 2030 ni->ni_chan = vap->iv_bss->ni_chan; 2031 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) { 2032 rate = ieee80211_setup_htrates(ni, htcap, 2033 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO | 2034 IEEE80211_F_DOBRS); 2035 if (rate & IEEE80211_RATE_BASIC) { 2036 ratesetmismatch(ni, wh, reassoc, resp, 2037 "HT", rate); 2038 vap->iv_stats.is_ht_assoc_norate++; 2039 return; 2040 } 2041 ieee80211_ht_node_init(ni); 2042 ieee80211_ht_updatehtcap(ni, htcap); 2043 } else if (ni->ni_flags & IEEE80211_NODE_HT) 2044 ieee80211_ht_node_cleanup(ni); 2045 /* 2046 * Allow AMPDU operation only with unencrypted traffic 2047 * or AES-CCM; the 11n spec only specifies these ciphers 2048 * so permitting any others is undefined and can lead 2049 * to interoperability problems. 2050 */ 2051 if ((ni->ni_flags & IEEE80211_NODE_HT) && 2052 (((vap->iv_flags & IEEE80211_F_WPA) && 2053 rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) || 2054 (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { 2055 IEEE80211_NOTE(vap, 2056 IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, 2057 "disallow HT use because WEP or TKIP requested, " 2058 "capinfo 0x%x ucastcipher %d", capinfo, 2059 rsnparms.rsn_ucastcipher); 2060 ieee80211_ht_node_cleanup(ni); 2061 vap->iv_stats.is_ht_assoc_downgrade++; 2062 } 2063 /* 2064 * If constrained to 11n-only stations reject legacy stations. 2065 */ 2066 if ((vap->iv_flags_ext & IEEE80211_FEXT_PUREN) && 2067 (ni->ni_flags & IEEE80211_NODE_HT) == 0) { 2068 htcapmismatch(ni, wh, reassoc, resp); 2069 vap->iv_stats.is_ht_assoc_nohtcap++; 2070 return; 2071 } 2072 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 2073 ni->ni_noise = noise; 2074 ni->ni_rstamp = rstamp; 2075 ni->ni_intval = lintval; 2076 ni->ni_capinfo = capinfo; 2077 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell; 2078 ni->ni_fhindex = vap->iv_bss->ni_fhindex; 2079 /* 2080 * Store the IEs. 2081 * XXX maybe better to just expand 2082 */ 2083 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { 2084#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) 2085 if (wpa != NULL) 2086 setie(wpa_ie, wpa - sfrm); 2087 if (rsn != NULL) 2088 setie(rsn_ie, rsn - sfrm); 2089 if (htcap != NULL) 2090 setie(htcap_ie, htcap - sfrm); 2091 if (wme != NULL) { 2092 setie(wme_ie, wme - sfrm); 2093 /* 2094 * Mark node as capable of QoS. 2095 */ 2096 ni->ni_flags |= IEEE80211_NODE_QOS; 2097 } else 2098 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2099 if (ath != NULL) { 2100 setie(ath_ie, ath - sfrm); 2101 /* 2102 * Parse ATH station parameters. 2103 */ 2104 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); 2105 } else 2106 ni->ni_ath_flags = 0; 2107#undef setie 2108 } else { 2109 ni->ni_flags &= ~IEEE80211_NODE_QOS; 2110 ni->ni_ath_flags = 0; 2111 } 2112 ieee80211_node_join(ni, resp); 2113 ieee80211_deliver_l2uf(ni); 2114 break; 2115 } 2116 2117 case IEEE80211_FC0_SUBTYPE_DEAUTH: 2118 case IEEE80211_FC0_SUBTYPE_DISASSOC: { 2119 uint16_t reason; 2120 2121 if (vap->iv_state != IEEE80211_S_RUN || 2122 /* NB: can happen when in promiscuous mode */ 2123 !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) { 2124 vap->iv_stats.is_rx_mgtdiscard++; 2125 break; 2126 } 2127 /* 2128 * deauth/disassoc frame format 2129 * [2] reason 2130 */ 2131 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); 2132 reason = le16toh(*(uint16_t *)frm); 2133 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) { 2134 vap->iv_stats.is_rx_deauth++; 2135 IEEE80211_NODE_STAT(ni, rx_deauth); 2136 } else { 2137 vap->iv_stats.is_rx_disassoc++; 2138 IEEE80211_NODE_STAT(ni, rx_disassoc); 2139 } 2140 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni, 2141 "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >> 2142 IEEE80211_FC0_SUBTYPE_SHIFT], reason); 2143 if (ni != vap->iv_bss) 2144 ieee80211_node_leave(ni); 2145 break; 2146 } 2147 2148 case IEEE80211_FC0_SUBTYPE_ACTION: 2149 if (vap->iv_state == IEEE80211_S_RUN) { 2150 if (ieee80211_parse_action(ni, m0) == 0) 2151 ic->ic_recv_action(ni, frm, efrm); 2152 } else 2153 vap->iv_stats.is_rx_mgtdiscard++; 2154 break; 2155 2156 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2157 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2158 default: 2159 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 2160 wh, "mgt", "subtype 0x%x not handled", subtype); 2161 vap->iv_stats.is_rx_badsubtype++; 2162 break; 2163 } 2164} 2165 2166/* 2167 * Process a received ps-poll frame. 2168 */ 2169static void 2170hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0) 2171{ 2172 struct ieee80211vap *vap = ni->ni_vap; 2173 struct ieee80211_frame_min *wh; 2174 struct ifnet *ifp; 2175 struct mbuf *m; 2176 uint16_t aid; 2177 int qlen; 2178 2179 wh = mtod(m0, struct ieee80211_frame_min *); 2180 if (ni->ni_associd == 0) { 2181 IEEE80211_DISCARD(vap, 2182 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2183 (struct ieee80211_frame *) wh, NULL, 2184 "%s", "unassociated station"); 2185 vap->iv_stats.is_ps_unassoc++; 2186 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, 2187 IEEE80211_REASON_NOT_ASSOCED); 2188 return; 2189 } 2190 2191 aid = le16toh(*(uint16_t *)wh->i_dur); 2192 if (aid != ni->ni_associd) { 2193 IEEE80211_DISCARD(vap, 2194 IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, 2195 (struct ieee80211_frame *) wh, NULL, 2196 "aid mismatch: sta aid 0x%x poll aid 0x%x", 2197 ni->ni_associd, aid); 2198 vap->iv_stats.is_ps_badaid++; 2199 /* 2200 * NB: We used to deauth the station but it turns out 2201 * the Blackberry Curve 8230 (and perhaps other devices) 2202 * sometimes send the wrong AID when WME is negotiated. 2203 * Being more lenient here seems ok as we already check 2204 * the station is associated and we only return frames 2205 * queued for the station (i.e. we don't use the AID). 2206 */ 2207 return; 2208 } 2209 2210 /* Okay, take the first queued packet and put it out... */ 2211 m = ieee80211_node_psq_dequeue(ni, &qlen); 2212 if (m == NULL) { 2213 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2, 2214 "%s", "recv ps-poll, but queue empty"); 2215 ieee80211_send_nulldata(ieee80211_ref_node(ni)); 2216 vap->iv_stats.is_ps_qempty++; /* XXX node stat */ 2217 if (vap->iv_set_tim != NULL) 2218 vap->iv_set_tim(ni, 0); /* just in case */ 2219 return; 2220 } 2221 /* 2222 * If there are more packets, set the more packets bit 2223 * in the packet dispatched to the station; otherwise 2224 * turn off the TIM bit. 2225 */ 2226 if (qlen != 0) { 2227 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2228 "recv ps-poll, send packet, %u still queued", qlen); 2229 m->m_flags |= M_MORE_DATA; 2230 } else { 2231 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, 2232 "%s", "recv ps-poll, send packet, queue empty"); 2233 if (vap->iv_set_tim != NULL) 2234 vap->iv_set_tim(ni, 0); 2235 } 2236 m->m_flags |= M_PWR_SAV; /* bypass PS handling */ 2237 2238 if (m->m_flags & M_ENCAP) 2239 ifp = vap->iv_ic->ic_ifp; 2240 else 2241 ifp = vap->iv_ifp; 2242 IF_ENQUEUE(&ifp->if_snd, m); 2243 if_start(ifp); 2244} 2245