1 /*- 2 * Copyright (c) 2007-2009 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 IBSS mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_media.h> 53 #include <net/if_llc.h> 54 #include <net/ethernet.h> 55 56 #include <net/bpf.h> 57 58 #include <netproto/802_11/ieee80211_var.h> 59 #include <netproto/802_11/ieee80211_adhoc.h> 60 #include <netproto/802_11/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <netproto/802_11/ieee80211_superg.h> 63 #endif 64 #ifdef IEEE80211_SUPPORT_TDMA 65 #include <netproto/802_11/ieee80211_tdma.h> 66 #endif 67 #include <netproto/802_11/ieee80211_sta.h> 68 69 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 70 71 static void adhoc_vattach(struct ieee80211vap *); 72 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int, int); 77 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 78 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 79 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 80 81 void 82 ieee80211_adhoc_attach(struct ieee80211com *ic) 83 { 84 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 85 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 86 } 87 88 void 89 ieee80211_adhoc_detach(struct ieee80211com *ic) 90 { 91 } 92 93 static void 94 adhoc_vdetach(struct ieee80211vap *vap) 95 { 96 } 97 98 static void 99 adhoc_vattach(struct ieee80211vap *vap) 100 { 101 vap->iv_newstate = adhoc_newstate; 102 vap->iv_input = adhoc_input; 103 if (vap->iv_opmode == IEEE80211_M_IBSS) 104 vap->iv_recv_mgmt = adhoc_recv_mgmt; 105 else 106 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 107 vap->iv_recv_ctl = adhoc_recv_ctl; 108 vap->iv_opdetach = adhoc_vdetach; 109 #ifdef IEEE80211_SUPPORT_TDMA 110 /* 111 * Throw control to tdma support. Note we do this 112 * after setting up our callbacks so it can piggyback 113 * on top of us. 114 */ 115 if (vap->iv_caps & IEEE80211_C_TDMA) 116 ieee80211_tdma_vattach(vap); 117 #endif 118 } 119 120 static void 121 sta_leave(void *arg, struct ieee80211_node *ni) 122 { 123 struct ieee80211vap *vap = arg; 124 125 if (ni->ni_vap == vap && ni != vap->iv_bss) 126 ieee80211_node_leave(ni); 127 } 128 129 /* 130 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 131 */ 132 static int 133 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 134 { 135 struct ieee80211com *ic = vap->iv_ic; 136 struct ieee80211_node *ni; 137 enum ieee80211_state ostate; 138 139 IEEE80211_LOCK_ASSERT(vap->iv_ic); 140 141 ostate = vap->iv_state; 142 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 143 __func__, ieee80211_state_name[ostate], 144 ieee80211_state_name[nstate], arg); 145 vap->iv_state = nstate; /* state transition */ 146 if (ostate != IEEE80211_S_SCAN) 147 ieee80211_cancel_scan(vap); /* background scan */ 148 ni = vap->iv_bss; /* NB: no reference held */ 149 switch (nstate) { 150 case IEEE80211_S_INIT: 151 switch (ostate) { 152 case IEEE80211_S_SCAN: 153 ieee80211_cancel_scan(vap); 154 break; 155 default: 156 break; 157 } 158 if (ostate != IEEE80211_S_INIT) { 159 /* NB: optimize INIT -> INIT case */ 160 ieee80211_reset_bss(vap); 161 } 162 break; 163 case IEEE80211_S_SCAN: 164 switch (ostate) { 165 case IEEE80211_S_RUN: /* beacon miss */ 166 /* purge station table; entries are stale */ 167 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 168 /* fall thru... */ 169 case IEEE80211_S_INIT: 170 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 171 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 172 /* 173 * Already have a channel; bypass the 174 * scan and startup immediately. 175 */ 176 ieee80211_create_ibss(vap, 177 ieee80211_ht_adjust_channel(ic, 178 vap->iv_des_chan, vap->iv_flags_ht)); 179 break; 180 } 181 /* 182 * Initiate a scan. We can come here as a result 183 * of an IEEE80211_IOC_SCAN_REQ too in which case 184 * the vap will be marked with IEEE80211_FEXT_SCANREQ 185 * and the scan request parameters will be present 186 * in iv_scanreq. Otherwise we do the default. 187 */ 188 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 189 ieee80211_check_scan(vap, 190 vap->iv_scanreq_flags, 191 vap->iv_scanreq_duration, 192 vap->iv_scanreq_mindwell, 193 vap->iv_scanreq_maxdwell, 194 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 195 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 196 } else 197 ieee80211_check_scan_current(vap); 198 break; 199 case IEEE80211_S_SCAN: 200 /* 201 * This can happen because of a change in state 202 * that requires a reset. Trigger a new scan 203 * unless we're in manual roaming mode in which 204 * case an application must issue an explicit request. 205 */ 206 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 207 ieee80211_check_scan_current(vap); 208 break; 209 default: 210 goto invalid; 211 } 212 break; 213 case IEEE80211_S_RUN: 214 if (vap->iv_flags & IEEE80211_F_WPA) { 215 /* XXX validate prerequisites */ 216 } 217 switch (ostate) { 218 case IEEE80211_S_SCAN: 219 #ifdef IEEE80211_DEBUG 220 if (ieee80211_msg_debug(vap)) { 221 ieee80211_note(vap, 222 "synchronized with %s ssid ", 223 ether_sprintf(ni->ni_bssid)); 224 ieee80211_print_essid(vap->iv_bss->ni_essid, 225 ni->ni_esslen); 226 /* XXX MCS/HT */ 227 kprintf(" channel %d start %uMb\n", 228 ieee80211_chan2ieee(ic, ic->ic_curchan), 229 IEEE80211_RATE2MBS(ni->ni_txrate)); 230 } 231 #endif 232 break; 233 case IEEE80211_S_RUN: /* IBSS merge */ 234 break; 235 default: 236 goto invalid; 237 } 238 /* 239 * When 802.1x is not in use mark the port authorized 240 * at this point so traffic can flow. 241 */ 242 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 243 ieee80211_node_authorize(ni); 244 /* 245 * Fake association when joining an existing bss. 246 */ 247 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 248 ic->ic_newassoc != NULL) 249 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 250 break; 251 case IEEE80211_S_SLEEP: 252 vap->iv_sta_ps(vap, 0); 253 break; 254 default: 255 invalid: 256 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 257 "%s: unexpected state transition %s -> %s\n", __func__, 258 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 259 break; 260 } 261 return 0; 262 } 263 264 /* 265 * Decide if a received management frame should be 266 * printed when debugging is enabled. This filters some 267 * of the less interesting frames that come frequently 268 * (e.g. beacons). 269 */ 270 static __inline int 271 doprint(struct ieee80211vap *vap, int subtype) 272 { 273 switch (subtype) { 274 case IEEE80211_FC0_SUBTYPE_BEACON: 275 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 276 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 277 return 1; 278 } 279 return 1; 280 } 281 282 /* 283 * Process a received frame. The node associated with the sender 284 * should be supplied. If nothing was found in the node table then 285 * the caller is assumed to supply a reference to iv_bss instead. 286 * The RSSI and a timestamp are also supplied. The RSSI data is used 287 * during AP scanning to select a AP to associate with; it can have 288 * any units so long as values have consistent units and higher values 289 * mean ``better signal''. The receive timestamp is currently not used 290 * by the 802.11 layer. 291 */ 292 static int 293 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 294 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 295 { 296 struct ieee80211vap *vap = ni->ni_vap; 297 struct ieee80211com *ic = ni->ni_ic; 298 struct ifnet *ifp = vap->iv_ifp; 299 struct ieee80211_frame *wh; 300 struct ieee80211_key *key; 301 struct ether_header *eh; 302 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 303 uint8_t dir, type, subtype, qos; 304 uint8_t *bssid; 305 306 if (m->m_flags & M_AMPDU_MPDU) { 307 /* 308 * Fastpath for A-MPDU reorder q resubmission. Frames 309 * w/ M_AMPDU_MPDU marked have already passed through 310 * here but were received out of order and been held on 311 * the reorder queue. When resubmitted they are marked 312 * with the M_AMPDU_MPDU flag and we can bypass most of 313 * the normal processing. 314 */ 315 wh = mtod(m, struct ieee80211_frame *); 316 type = IEEE80211_FC0_TYPE_DATA; 317 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 318 subtype = IEEE80211_FC0_SUBTYPE_QOS; 319 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 320 goto resubmit_ampdu; 321 } 322 323 KASSERT(ni != NULL, ("null node")); 324 ni->ni_inact = ni->ni_inact_reload; 325 326 type = -1; /* undefined */ 327 328 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 329 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 330 ni->ni_macaddr, NULL, 331 "too short (1): len %u", m->m_pkthdr.len); 332 vap->iv_stats.is_rx_tooshort++; 333 goto out; 334 } 335 /* 336 * Bit of a cheat here, we use a pointer for a 3-address 337 * frame format but don't reference fields past outside 338 * ieee80211_frame_min w/o first validating the data is 339 * present. 340 */ 341 wh = mtod(m, struct ieee80211_frame *); 342 343 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 344 IEEE80211_FC0_VERSION_0) { 345 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 346 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 347 wh->i_fc[0], wh->i_fc[1]); 348 vap->iv_stats.is_rx_badversion++; 349 goto err; 350 } 351 352 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 353 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 354 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 355 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 356 if (dir != IEEE80211_FC1_DIR_NODS) 357 bssid = wh->i_addr1; 358 else if (type == IEEE80211_FC0_TYPE_CTL) 359 bssid = wh->i_addr1; 360 else { 361 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 362 IEEE80211_DISCARD_MAC(vap, 363 IEEE80211_MSG_ANY, ni->ni_macaddr, 364 NULL, "too short (2): len %u", 365 m->m_pkthdr.len); 366 vap->iv_stats.is_rx_tooshort++; 367 goto out; 368 } 369 bssid = wh->i_addr3; 370 } 371 /* 372 * Validate the bssid. 373 */ 374 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 375 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 376 /* not interested in */ 377 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 378 bssid, NULL, "%s", "not to bss"); 379 vap->iv_stats.is_rx_wrongbss++; 380 goto out; 381 } 382 /* 383 * Data frame, cons up a node when it doesn't 384 * exist. This should probably done after an ACL check. 385 */ 386 if (type == IEEE80211_FC0_TYPE_DATA && 387 ni == vap->iv_bss && 388 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 389 /* 390 * Beware of frames that come in too early; we 391 * can receive broadcast frames and creating sta 392 * entries will blow up because there is no bss 393 * channel yet. 394 */ 395 if (vap->iv_state != IEEE80211_S_RUN) { 396 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 397 wh, "data", "not in RUN state (%s)", 398 ieee80211_state_name[vap->iv_state]); 399 vap->iv_stats.is_rx_badstate++; 400 goto err; 401 } 402 /* 403 * Fake up a node for this newly 404 * discovered member of the IBSS. 405 */ 406 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 407 if (ni == NULL) { 408 /* NB: stat kept for alloc failure */ 409 goto err; 410 } 411 } 412 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 413 ni->ni_noise = nf; 414 if (IEEE80211_HAS_SEQ(type, subtype) && 415 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 416 uint8_t tid = ieee80211_gettid(wh); 417 if (IEEE80211_QOS_HAS_SEQ(wh) && 418 TID_TO_WME_AC(tid) >= WME_AC_VI) 419 ic->ic_wme.wme_hipri_traffic++; 420 if (! ieee80211_check_rxseq(ni, wh, bssid)) 421 goto out; 422 } 423 } 424 425 switch (type) { 426 case IEEE80211_FC0_TYPE_DATA: 427 hdrspace = ieee80211_hdrspace(ic, wh); 428 if (m->m_len < hdrspace && 429 (m = m_pullup(m, hdrspace)) == NULL) { 430 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 431 ni->ni_macaddr, NULL, 432 "data too short: expecting %u", hdrspace); 433 vap->iv_stats.is_rx_tooshort++; 434 goto out; /* XXX */ 435 } 436 if (dir != IEEE80211_FC1_DIR_NODS) { 437 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 438 wh, "data", "incorrect dir 0x%x", dir); 439 vap->iv_stats.is_rx_wrongdir++; 440 goto out; 441 } 442 /* XXX no power-save support */ 443 444 /* 445 * Handle A-MPDU re-ordering. If the frame is to be 446 * processed directly then ieee80211_ampdu_reorder 447 * will return 0; otherwise it has consumed the mbuf 448 * and we should do nothing more with it. 449 */ 450 if ((m->m_flags & M_AMPDU) && 451 ieee80211_ampdu_reorder(ni, m) != 0) { 452 m = NULL; 453 goto out; 454 } 455 resubmit_ampdu: 456 457 /* 458 * Handle privacy requirements. Note that we 459 * must not be preempted from here until after 460 * we (potentially) call ieee80211_crypto_demic; 461 * otherwise we may violate assumptions in the 462 * crypto cipher modules used to do delayed update 463 * of replay sequence numbers. 464 */ 465 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 466 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 467 /* 468 * Discard encrypted frames when privacy is off. 469 */ 470 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 471 wh, "WEP", "%s", "PRIVACY off"); 472 vap->iv_stats.is_rx_noprivacy++; 473 IEEE80211_NODE_STAT(ni, rx_noprivacy); 474 goto out; 475 } 476 key = ieee80211_crypto_decap(ni, m, hdrspace); 477 if (key == NULL) { 478 /* NB: stats+msgs handled in crypto_decap */ 479 IEEE80211_NODE_STAT(ni, rx_wepfail); 480 goto out; 481 } 482 wh = mtod(m, struct ieee80211_frame *); 483 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 484 } else { 485 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 486 key = NULL; 487 } 488 489 /* 490 * Save QoS bits for use below--before we strip the header. 491 */ 492 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 493 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 494 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 495 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 496 } else 497 qos = 0; 498 499 /* 500 * Next up, any fragmentation. 501 */ 502 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 503 m = ieee80211_defrag(ni, m, hdrspace); 504 if (m == NULL) { 505 /* Fragment dropped or frame not complete yet */ 506 goto out; 507 } 508 } 509 wh = NULL; /* no longer valid, catch any uses */ 510 511 /* 512 * Next strip any MSDU crypto bits. 513 */ 514 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 515 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 516 ni->ni_macaddr, "data", "%s", "demic error"); 517 vap->iv_stats.is_rx_demicfail++; 518 IEEE80211_NODE_STAT(ni, rx_demicfail); 519 goto out; 520 } 521 522 /* copy to listener after decrypt */ 523 if (ieee80211_radiotap_active_vap(vap)) 524 ieee80211_radiotap_rx(vap, m); 525 need_tap = 0; 526 527 /* 528 * Finally, strip the 802.11 header. 529 */ 530 m = ieee80211_decap(vap, m, hdrspace); 531 if (m == NULL) { 532 /* XXX mask bit to check for both */ 533 /* don't count Null data frames as errors */ 534 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 535 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 536 goto out; 537 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 538 ni->ni_macaddr, "data", "%s", "decap error"); 539 vap->iv_stats.is_rx_decap++; 540 IEEE80211_NODE_STAT(ni, rx_decap); 541 goto err; 542 } 543 eh = mtod(m, struct ether_header *); 544 if (!ieee80211_node_is_authorized(ni)) { 545 /* 546 * Deny any non-PAE frames received prior to 547 * authorization. For open/shared-key 548 * authentication the port is mark authorized 549 * after authentication completes. For 802.1x 550 * the port is not marked authorized by the 551 * authenticator until the handshake has completed. 552 */ 553 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 554 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 555 eh->ether_shost, "data", 556 "unauthorized port: ether type 0x%x len %u", 557 eh->ether_type, m->m_pkthdr.len); 558 vap->iv_stats.is_rx_unauth++; 559 IEEE80211_NODE_STAT(ni, rx_unauth); 560 goto err; 561 } 562 } else { 563 /* 564 * When denying unencrypted frames, discard 565 * any non-PAE frames received without encryption. 566 */ 567 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 568 (key == NULL && (m->m_flags & M_WEP) == 0) && 569 eh->ether_type != htons(ETHERTYPE_PAE)) { 570 /* 571 * Drop unencrypted frames. 572 */ 573 vap->iv_stats.is_rx_unencrypted++; 574 IEEE80211_NODE_STAT(ni, rx_unencrypted); 575 goto out; 576 } 577 } 578 /* XXX require HT? */ 579 if (qos & IEEE80211_QOS_AMSDU) { 580 m = ieee80211_decap_amsdu(ni, m); 581 if (m == NULL) 582 return IEEE80211_FC0_TYPE_DATA; 583 } else { 584 #ifdef IEEE80211_SUPPORT_SUPERG 585 m = ieee80211_decap_fastframe(vap, ni, m); 586 if (m == NULL) 587 return IEEE80211_FC0_TYPE_DATA; 588 #endif 589 } 590 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 591 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 592 else 593 ieee80211_deliver_data(vap, ni, m); 594 return IEEE80211_FC0_TYPE_DATA; 595 596 case IEEE80211_FC0_TYPE_MGT: 597 vap->iv_stats.is_rx_mgmt++; 598 IEEE80211_NODE_STAT(ni, rx_mgmt); 599 if (dir != IEEE80211_FC1_DIR_NODS) { 600 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 601 wh, "data", "incorrect dir 0x%x", dir); 602 vap->iv_stats.is_rx_wrongdir++; 603 goto err; 604 } 605 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 606 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 607 ni->ni_macaddr, "mgt", "too short: len %u", 608 m->m_pkthdr.len); 609 vap->iv_stats.is_rx_tooshort++; 610 goto out; 611 } 612 #ifdef IEEE80211_DEBUG 613 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 614 ieee80211_msg_dumppkts(vap)) { 615 if_printf(ifp, "received %s from %s rssi %d\n", 616 ieee80211_mgt_subtype_name(subtype), 617 ether_sprintf(wh->i_addr2), rssi); 618 } 619 #endif 620 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 621 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 622 wh, NULL, "%s", "WEP set but not permitted"); 623 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 624 goto out; 625 } 626 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 627 goto out; 628 629 case IEEE80211_FC0_TYPE_CTL: 630 vap->iv_stats.is_rx_ctl++; 631 IEEE80211_NODE_STAT(ni, rx_ctrl); 632 vap->iv_recv_ctl(ni, m, subtype); 633 goto out; 634 635 default: 636 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 637 wh, "bad", "frame type 0x%x", type); 638 /* should not come here */ 639 break; 640 } 641 err: 642 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 643 out: 644 if (m != NULL) { 645 if (need_tap && ieee80211_radiotap_active_vap(vap)) 646 ieee80211_radiotap_rx(vap, m); 647 m_freem(m); 648 } 649 return type; 650 } 651 652 static int 653 is11bclient(const uint8_t *rates, const uint8_t *xrates) 654 { 655 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 656 int i; 657 658 /* NB: the 11b clients we care about will not have xrates */ 659 if (xrates != NULL || rates == NULL) 660 return 0; 661 for (i = 0; i < rates[1]; i++) { 662 int r = rates[2+i] & IEEE80211_RATE_VAL; 663 if (r > 2*11 || ((1<<r) & brates) == 0) 664 return 0; 665 } 666 return 1; 667 } 668 669 static void 670 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 671 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 672 { 673 struct ieee80211vap *vap = ni->ni_vap; 674 struct ieee80211com *ic = ni->ni_ic; 675 struct ieee80211_channel *rxchan = ic->ic_curchan; 676 struct ieee80211_frame *wh; 677 uint8_t *frm, *efrm, *sfrm; 678 uint8_t *ssid, *rates, *xrates; 679 #if 0 680 int ht_state_change = 0; 681 #endif 682 683 wh = mtod(m0, struct ieee80211_frame *); 684 frm = (uint8_t *)&wh[1]; 685 efrm = mtod(m0, uint8_t *) + m0->m_len; 686 switch (subtype) { 687 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 688 case IEEE80211_FC0_SUBTYPE_BEACON: { 689 struct ieee80211_scanparams scan; 690 struct ieee80211_channel *c; 691 /* 692 * We process beacon/probe response 693 * frames to discover neighbors. 694 */ 695 if (rxs != NULL) { 696 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 697 if (c != NULL) 698 rxchan = c; 699 } 700 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 701 return; 702 /* 703 * Count frame now that we know it's to be processed. 704 */ 705 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 706 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 707 IEEE80211_NODE_STAT(ni, rx_beacons); 708 } else 709 IEEE80211_NODE_STAT(ni, rx_proberesp); 710 /* 711 * If scanning, just pass information to the scan module. 712 */ 713 if (ic->ic_flags & IEEE80211_F_SCAN) { 714 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 715 /* 716 * Actively scanning a channel marked passive; 717 * send a probe request now that we know there 718 * is 802.11 traffic present. 719 * 720 * XXX check if the beacon we recv'd gives 721 * us what we need and suppress the probe req 722 */ 723 ieee80211_probe_curchan(vap, 1); 724 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 725 } 726 ieee80211_add_scan(vap, rxchan, &scan, wh, 727 subtype, rssi, nf); 728 return; 729 } 730 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 731 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 732 /* 733 * Create a new entry in the neighbor table. 734 */ 735 ni = ieee80211_add_neighbor(vap, wh, &scan); 736 } else if (ni->ni_capinfo == 0) { 737 /* 738 * Update faked node created on transmit. 739 * Note this also updates the tsf. 740 */ 741 ieee80211_init_neighbor(ni, wh, &scan); 742 } else { 743 /* 744 * Record tsf for potential resync. 745 */ 746 memcpy(ni->ni_tstamp.data, scan.tstamp, 747 sizeof(ni->ni_tstamp)); 748 } 749 /* 750 * This isn't enabled yet - otherwise it would 751 * update the HT parameters and channel width 752 * from any node, which could lead to lots of 753 * strange behaviour if the 11n nodes aren't 754 * exactly configured to match. 755 */ 756 #if 0 757 if (scan.htcap != NULL && scan.htinfo != NULL && 758 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 759 if (ieee80211_ht_updateparams(ni, 760 scan.htcap, scan.htinfo)) 761 ht_state_change = 1; 762 } 763 #endif 764 if (ni != NULL) { 765 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 766 ni->ni_noise = nf; 767 } 768 /* 769 * Same here - the channel width change should 770 * be applied to the specific peer node, not 771 * to the ic. Ie, the interface configuration 772 * should stay in its current channel width; 773 * but it should change the rate control and 774 * any queued frames for the given node only. 775 * 776 * Since there's no (current) way to inform 777 * the driver that a channel width change has 778 * occurred for a single node, just stub this 779 * out. 780 */ 781 #if 0 782 if (ht_state_change) 783 ieee80211_update_chw(ic); 784 #endif 785 } 786 break; 787 } 788 789 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 790 if (vap->iv_state != IEEE80211_S_RUN) { 791 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 792 wh, NULL, "wrong state %s", 793 ieee80211_state_name[vap->iv_state]); 794 vap->iv_stats.is_rx_mgtdiscard++; 795 return; 796 } 797 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 798 /* frame must be directed */ 799 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 800 wh, NULL, "%s", "not unicast"); 801 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 802 return; 803 } 804 805 /* 806 * prreq frame format 807 * [tlv] ssid 808 * [tlv] supported rates 809 * [tlv] extended supported rates 810 */ 811 ssid = rates = xrates = NULL; 812 sfrm = frm; 813 while (efrm - frm > 1) { 814 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 815 switch (*frm) { 816 case IEEE80211_ELEMID_SSID: 817 ssid = frm; 818 break; 819 case IEEE80211_ELEMID_RATES: 820 rates = frm; 821 break; 822 case IEEE80211_ELEMID_XRATES: 823 xrates = frm; 824 break; 825 } 826 frm += frm[1] + 2; 827 } 828 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 829 if (xrates != NULL) 830 IEEE80211_VERIFY_ELEMENT(xrates, 831 IEEE80211_RATE_MAXSIZE - rates[1], return); 832 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 833 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 834 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 835 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 836 wh, NULL, 837 "%s", "no ssid with ssid suppression enabled"); 838 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 839 return; 840 } 841 842 /* XXX find a better class or define it's own */ 843 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 844 "%s", "recv probe req"); 845 /* 846 * Some legacy 11b clients cannot hack a complete 847 * probe response frame. When the request includes 848 * only a bare-bones rate set, communicate this to 849 * the transmit side. 850 */ 851 ieee80211_send_proberesp(vap, wh->i_addr2, 852 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 853 break; 854 855 case IEEE80211_FC0_SUBTYPE_ACTION: 856 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 857 if ((ni == vap->iv_bss) && 858 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 859 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 860 wh, NULL, "%s", "unknown node"); 861 vap->iv_stats.is_rx_mgtdiscard++; 862 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 863 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 864 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 865 wh, NULL, "%s", "not for us"); 866 vap->iv_stats.is_rx_mgtdiscard++; 867 } else if (vap->iv_state != IEEE80211_S_RUN) { 868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 869 wh, NULL, "wrong state %s", 870 ieee80211_state_name[vap->iv_state]); 871 vap->iv_stats.is_rx_mgtdiscard++; 872 } else { 873 if (ieee80211_parse_action(ni, m0) == 0) 874 (void)ic->ic_recv_action(ni, wh, frm, efrm); 875 } 876 break; 877 878 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 879 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 880 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 881 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 882 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 883 case IEEE80211_FC0_SUBTYPE_ATIM: 884 case IEEE80211_FC0_SUBTYPE_DISASSOC: 885 case IEEE80211_FC0_SUBTYPE_AUTH: 886 case IEEE80211_FC0_SUBTYPE_DEAUTH: 887 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 888 wh, NULL, "%s", "not handled"); 889 vap->iv_stats.is_rx_mgtdiscard++; 890 break; 891 892 default: 893 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 894 wh, "mgt", "subtype 0x%x not handled", subtype); 895 vap->iv_stats.is_rx_badsubtype++; 896 break; 897 } 898 } 899 #undef IEEE80211_VERIFY_LENGTH 900 #undef IEEE80211_VERIFY_ELEMENT 901 902 static void 903 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 904 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 905 { 906 struct ieee80211vap *vap = ni->ni_vap; 907 struct ieee80211com *ic = ni->ni_ic; 908 struct ieee80211_frame *wh; 909 910 /* 911 * Process management frames when scanning; useful for doing 912 * a site-survey. 913 */ 914 if (ic->ic_flags & IEEE80211_F_SCAN) 915 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 916 else { 917 wh = mtod(m0, struct ieee80211_frame *); 918 switch (subtype) { 919 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 920 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 921 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 922 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 923 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 924 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 925 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 926 case IEEE80211_FC0_SUBTYPE_BEACON: 927 case IEEE80211_FC0_SUBTYPE_ATIM: 928 case IEEE80211_FC0_SUBTYPE_DISASSOC: 929 case IEEE80211_FC0_SUBTYPE_AUTH: 930 case IEEE80211_FC0_SUBTYPE_DEAUTH: 931 case IEEE80211_FC0_SUBTYPE_ACTION: 932 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 933 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 934 wh, NULL, "%s", "not handled"); 935 vap->iv_stats.is_rx_mgtdiscard++; 936 break; 937 default: 938 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 939 wh, "mgt", "subtype 0x%x not handled", subtype); 940 vap->iv_stats.is_rx_badsubtype++; 941 break; 942 } 943 } 944 } 945 946 static void 947 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 948 { 949 950 switch (subtype) { 951 case IEEE80211_FC0_SUBTYPE_BAR: 952 ieee80211_recv_bar(ni, m); 953 break; 954 } 955 } 956