1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 /* 29 * IEEE 802.11 IBSS mode support. 30 */ 31 #include "opt_inet.h" 32 #include "opt_wlan.h" 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/malloc.h> 38 #include <sys/kernel.h> 39 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/endian.h> 43 #include <sys/errno.h> 44 #include <sys/proc.h> 45 #include <sys/sysctl.h> 46 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 53 #include <net/bpf.h> 54 55 #include <net80211/ieee80211_var.h> 56 #include <net80211/ieee80211_adhoc.h> 57 #include <net80211/ieee80211_input.h> 58 #ifdef IEEE80211_SUPPORT_SUPERG 59 #include <net80211/ieee80211_superg.h> 60 #endif 61 #ifdef IEEE80211_SUPPORT_TDMA 62 #include <net80211/ieee80211_tdma.h> 63 #endif 64 #include <net80211/ieee80211_sta.h> 65 66 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 67 68 static void adhoc_vattach(struct ieee80211vap *); 69 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 70 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 71 const struct ieee80211_rx_stats *, int, int); 72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, const struct ieee80211_rx_stats *, int, int); 74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 75 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 77 78 void 79 ieee80211_adhoc_attach(struct ieee80211com *ic) 80 { 81 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 82 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 83 } 84 85 void 86 ieee80211_adhoc_detach(struct ieee80211com *ic) 87 { 88 } 89 90 static void 91 adhoc_vdetach(struct ieee80211vap *vap) 92 { 93 } 94 95 static void 96 adhoc_vattach(struct ieee80211vap *vap) 97 { 98 vap->iv_newstate = adhoc_newstate; 99 vap->iv_input = adhoc_input; 100 if (vap->iv_opmode == IEEE80211_M_IBSS) 101 vap->iv_recv_mgmt = adhoc_recv_mgmt; 102 else 103 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 104 vap->iv_recv_ctl = adhoc_recv_ctl; 105 vap->iv_opdetach = adhoc_vdetach; 106 #ifdef IEEE80211_SUPPORT_TDMA 107 /* 108 * Throw control to tdma support. Note we do this 109 * after setting up our callbacks so it can piggyback 110 * on top of us. 111 */ 112 if (vap->iv_caps & IEEE80211_C_TDMA) 113 ieee80211_tdma_vattach(vap); 114 #endif 115 } 116 117 static void 118 sta_leave(void *arg, struct ieee80211_node *ni) 119 { 120 struct ieee80211vap *vap = ni->ni_vap; 121 122 if (ni != vap->iv_bss) 123 ieee80211_node_leave(ni); 124 } 125 126 /* 127 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 128 */ 129 static int 130 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 131 { 132 struct ieee80211com *ic = vap->iv_ic; 133 struct ieee80211_node *ni; 134 enum ieee80211_state ostate; 135 136 IEEE80211_LOCK_ASSERT(vap->iv_ic); 137 138 ostate = vap->iv_state; 139 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 140 __func__, ieee80211_state_name[ostate], 141 ieee80211_state_name[nstate], arg); 142 vap->iv_state = nstate; /* state transition */ 143 if (ostate != IEEE80211_S_SCAN) 144 ieee80211_cancel_scan(vap); /* background scan */ 145 ni = vap->iv_bss; /* NB: no reference held */ 146 switch (nstate) { 147 case IEEE80211_S_INIT: 148 switch (ostate) { 149 case IEEE80211_S_SCAN: 150 ieee80211_cancel_scan(vap); 151 break; 152 default: 153 break; 154 } 155 if (ostate != IEEE80211_S_INIT) { 156 /* NB: optimize INIT -> INIT case */ 157 ieee80211_reset_bss(vap); 158 } 159 break; 160 case IEEE80211_S_SCAN: 161 switch (ostate) { 162 case IEEE80211_S_RUN: /* beacon miss */ 163 /* purge station table; entries are stale */ 164 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, 165 sta_leave, NULL); 166 /* fall thru... */ 167 case IEEE80211_S_INIT: 168 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 169 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 170 /* 171 * Already have a channel; bypass the 172 * scan and startup immediately. 173 */ 174 ieee80211_create_ibss(vap, 175 ieee80211_ht_adjust_channel(ic, 176 vap->iv_des_chan, vap->iv_flags_ht)); 177 break; 178 } 179 /* 180 * Initiate a scan. We can come here as a result 181 * of an IEEE80211_IOC_SCAN_REQ too in which case 182 * the vap will be marked with IEEE80211_FEXT_SCANREQ 183 * and the scan request parameters will be present 184 * in iv_scanreq. Otherwise we do the default. 185 */ 186 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 187 ieee80211_check_scan(vap, 188 vap->iv_scanreq_flags, 189 vap->iv_scanreq_duration, 190 vap->iv_scanreq_mindwell, 191 vap->iv_scanreq_maxdwell, 192 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 193 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 194 } else 195 ieee80211_check_scan_current(vap); 196 break; 197 case IEEE80211_S_SCAN: 198 /* 199 * This can happen because of a change in state 200 * that requires a reset. Trigger a new scan 201 * unless we're in manual roaming mode in which 202 * case an application must issue an explicit request. 203 */ 204 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 205 ieee80211_check_scan_current(vap); 206 break; 207 default: 208 goto invalid; 209 } 210 break; 211 case IEEE80211_S_RUN: 212 if (vap->iv_flags & IEEE80211_F_WPA) { 213 /* XXX validate prerequisites */ 214 } 215 switch (ostate) { 216 case IEEE80211_S_INIT: 217 /* 218 * Already have a channel; bypass the 219 * scan and startup immediately. 220 * Note that ieee80211_create_ibss will call 221 * back to do a RUN->RUN state change. 222 */ 223 ieee80211_create_ibss(vap, 224 ieee80211_ht_adjust_channel(ic, 225 ic->ic_curchan, vap->iv_flags_ht)); 226 /* NB: iv_bss is changed on return */ 227 ni = vap->iv_bss; 228 break; 229 case IEEE80211_S_SCAN: 230 #ifdef IEEE80211_DEBUG 231 if (ieee80211_msg_debug(vap)) { 232 ieee80211_note(vap, 233 "synchronized with %s ssid ", 234 ether_sprintf(ni->ni_bssid)); 235 ieee80211_print_essid(vap->iv_bss->ni_essid, 236 ni->ni_esslen); 237 net80211_printf(" channel %d start %uMbit/s\n", 238 ieee80211_chan2ieee(ic, ic->ic_curchan), 239 ieee80211_node_get_txrate_kbit(ni) / 1000); 240 } 241 #endif 242 break; 243 case IEEE80211_S_RUN: /* IBSS merge */ 244 break; 245 default: 246 goto invalid; 247 } 248 /* 249 * When 802.1x is not in use mark the port authorized 250 * at this point so traffic can flow. 251 */ 252 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 253 ieee80211_node_authorize(ni); 254 /* 255 * Fake association when joining an existing bss. 256 */ 257 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 258 ic->ic_newassoc != NULL) 259 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 260 break; 261 case IEEE80211_S_SLEEP: 262 vap->iv_sta_ps(vap, 0); 263 break; 264 default: 265 invalid: 266 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 267 "%s: unexpected state transition %s -> %s\n", __func__, 268 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 269 break; 270 } 271 return 0; 272 } 273 274 /* 275 * Decide if a received management frame should be 276 * printed when debugging is enabled. This filters some 277 * of the less interesting frames that come frequently 278 * (e.g. beacons). 279 */ 280 static __inline int 281 doprint(struct ieee80211vap *vap, int subtype) 282 { 283 switch (subtype) { 284 case IEEE80211_FC0_SUBTYPE_BEACON: 285 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 286 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 287 return 1; 288 } 289 return 1; 290 } 291 292 /* 293 * Process a received frame. The node associated with the sender 294 * should be supplied. If nothing was found in the node table then 295 * the caller is assumed to supply a reference to iv_bss instead. 296 * The RSSI and a timestamp are also supplied. The RSSI data is used 297 * during AP scanning to select a AP to associate with; it can have 298 * any units so long as values have consistent units and higher values 299 * mean ``better signal''. The receive timestamp is currently not used 300 * by the 802.11 layer. 301 */ 302 static int 303 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 304 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 305 { 306 struct ieee80211vap *vap = ni->ni_vap; 307 struct ieee80211com *ic = ni->ni_ic; 308 struct ifnet *ifp = vap->iv_ifp; 309 struct ieee80211_frame *wh; 310 struct ieee80211_key *key; 311 struct ether_header *eh; 312 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 313 uint8_t dir, type, subtype, qos; 314 uint8_t *bssid; 315 int is_hw_decrypted = 0; 316 int has_decrypted = 0; 317 318 /* 319 * Some devices do hardware decryption all the way through 320 * to pretending the frame wasn't encrypted in the first place. 321 * So, tag it appropriately so it isn't discarded inappropriately. 322 */ 323 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 324 is_hw_decrypted = 1; 325 326 if (m->m_flags & M_AMPDU_MPDU) { 327 /* 328 * Fastpath for A-MPDU reorder q resubmission. Frames 329 * w/ M_AMPDU_MPDU marked have already passed through 330 * here but were received out of order and been held on 331 * the reorder queue. When resubmitted they are marked 332 * with the M_AMPDU_MPDU flag and we can bypass most of 333 * the normal processing. 334 */ 335 wh = mtod(m, struct ieee80211_frame *); 336 type = IEEE80211_FC0_TYPE_DATA; 337 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 338 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 339 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 340 goto resubmit_ampdu; 341 } 342 343 KASSERT(ni != NULL, ("null node")); 344 ni->ni_inact = ni->ni_inact_reload; 345 346 type = -1; /* undefined */ 347 348 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 349 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 350 ni->ni_macaddr, NULL, 351 "too short (1): len %u", m->m_pkthdr.len); 352 vap->iv_stats.is_rx_tooshort++; 353 goto out; 354 } 355 /* 356 * Bit of a cheat here, we use a pointer for a 3-address 357 * frame format but don't reference fields past outside 358 * ieee80211_frame_min w/o first validating the data is 359 * present. 360 */ 361 wh = mtod(m, struct ieee80211_frame *); 362 363 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) { 364 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 365 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 366 wh->i_fc[0], wh->i_fc[1]); 367 vap->iv_stats.is_rx_badversion++; 368 goto err; 369 } 370 371 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 372 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 373 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 374 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 375 if (dir != IEEE80211_FC1_DIR_NODS) 376 bssid = wh->i_addr1; 377 else if (type == IEEE80211_FC0_TYPE_CTL) 378 bssid = wh->i_addr1; 379 else { 380 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 381 IEEE80211_DISCARD_MAC(vap, 382 IEEE80211_MSG_ANY, ni->ni_macaddr, 383 NULL, "too short (2): len %u", 384 m->m_pkthdr.len); 385 vap->iv_stats.is_rx_tooshort++; 386 goto out; 387 } 388 bssid = wh->i_addr3; 389 } 390 /* 391 * Validate the bssid. 392 */ 393 if (!(type == IEEE80211_FC0_TYPE_MGT && 394 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 395 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 396 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 397 !IEEE80211_ADDR_EQ(bssid, 398 ieee80211_vap_get_broadcast_address(vap))) { 399 /* not interested in */ 400 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 401 bssid, NULL, "%s", "not to bss"); 402 vap->iv_stats.is_rx_wrongbss++; 403 goto out; 404 } 405 /* 406 * Data frame, cons up a node when it doesn't 407 * exist. This should probably done after an ACL check. 408 */ 409 if (type == IEEE80211_FC0_TYPE_DATA && 410 ni == vap->iv_bss && 411 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 412 /* 413 * Beware of frames that come in too early; we 414 * can receive broadcast frames and creating sta 415 * entries will blow up because there is no bss 416 * channel yet. 417 */ 418 if (vap->iv_state != IEEE80211_S_RUN) { 419 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 420 wh, "data", "not in RUN state (%s)", 421 ieee80211_state_name[vap->iv_state]); 422 vap->iv_stats.is_rx_badstate++; 423 goto err; 424 } 425 /* 426 * Fake up a node for this newly discovered member 427 * of the IBSS. 428 * 429 * Note: This doesn't "upgrade" the node to 11n; 430 * that will happen after a probe request/response 431 * exchange. 432 */ 433 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 434 if (ni == NULL) { 435 /* NB: stat kept for alloc failure */ 436 goto err; 437 } 438 } 439 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 440 ni->ni_noise = nf; 441 if (IEEE80211_HAS_SEQ(type, subtype) && 442 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 443 uint8_t tid = ieee80211_gettid(wh); 444 if (IEEE80211_QOS_HAS_SEQ(wh) && 445 TID_TO_WME_AC(tid) >= WME_AC_VI) 446 ic->ic_wme.wme_hipri_traffic++; 447 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 448 goto out; 449 } 450 } 451 452 switch (type) { 453 case IEEE80211_FC0_TYPE_DATA: 454 hdrspace = ieee80211_hdrspace(ic, wh); 455 if (m->m_len < hdrspace && 456 (m = m_pullup(m, hdrspace)) == NULL) { 457 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 458 ni->ni_macaddr, NULL, 459 "data too short: expecting %u", hdrspace); 460 vap->iv_stats.is_rx_tooshort++; 461 goto out; /* XXX */ 462 } 463 if (dir != IEEE80211_FC1_DIR_NODS) { 464 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 465 wh, "data", "incorrect dir 0x%x", dir); 466 vap->iv_stats.is_rx_wrongdir++; 467 goto out; 468 } 469 /* XXX no power-save support */ 470 471 /* 472 * Handle A-MPDU re-ordering. If the frame is to be 473 * processed directly then ieee80211_ampdu_reorder 474 * will return 0; otherwise it has consumed the mbuf 475 * and we should do nothing more with it. 476 */ 477 if ((m->m_flags & M_AMPDU) && 478 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 479 m = NULL; 480 goto out; 481 } 482 resubmit_ampdu: 483 484 /* 485 * Handle privacy requirements. Note that we 486 * must not be preempted from here until after 487 * we (potentially) call ieee80211_crypto_demic; 488 * otherwise we may violate assumptions in the 489 * crypto cipher modules used to do delayed update 490 * of replay sequence numbers. 491 */ 492 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) { 493 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 494 /* 495 * Discard encrypted frames when privacy is off. 496 */ 497 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 498 wh, "WEP", "%s", "PRIVACY off"); 499 vap->iv_stats.is_rx_noprivacy++; 500 IEEE80211_NODE_STAT(ni, rx_noprivacy); 501 goto out; 502 } 503 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 504 /* NB: stats+msgs handled in crypto_decap */ 505 IEEE80211_NODE_STAT(ni, rx_wepfail); 506 goto out; 507 } 508 wh = mtod(m, struct ieee80211_frame *); 509 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 510 has_decrypted = 1; 511 } else { 512 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 513 key = NULL; 514 } 515 516 /* 517 * Save QoS bits for use below--before we strip the header. 518 */ 519 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA) 520 qos = ieee80211_getqos(wh)[0]; 521 else 522 qos = 0; 523 524 /* 525 * Next up, any fragmentation. 526 */ 527 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 528 m = ieee80211_defrag(ni, m, hdrspace, has_decrypted); 529 if (m == NULL) { 530 /* Fragment dropped or frame not complete yet */ 531 goto out; 532 } 533 } 534 wh = NULL; /* no longer valid, catch any uses */ 535 536 /* 537 * Next strip any MSDU crypto bits. 538 */ 539 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 540 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 541 ni->ni_macaddr, "data", "%s", "demic error"); 542 vap->iv_stats.is_rx_demicfail++; 543 IEEE80211_NODE_STAT(ni, rx_demicfail); 544 goto out; 545 } 546 547 /* copy to listener after decrypt */ 548 if (ieee80211_radiotap_active_vap(vap)) 549 ieee80211_radiotap_rx(vap, m); 550 need_tap = 0; 551 552 /* 553 * Finally, strip the 802.11 header. 554 */ 555 m = ieee80211_decap(vap, m, hdrspace, qos); 556 if (m == NULL) { 557 /* XXX mask bit to check for both */ 558 /* don't count Null data frames as errors */ 559 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 560 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 561 goto out; 562 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 563 ni->ni_macaddr, "data", "%s", "decap error"); 564 vap->iv_stats.is_rx_decap++; 565 IEEE80211_NODE_STAT(ni, rx_decap); 566 goto err; 567 } 568 if (!(qos & IEEE80211_QOS_AMSDU)) 569 eh = mtod(m, struct ether_header *); 570 else 571 eh = NULL; 572 if (!ieee80211_node_is_authorized(ni)) { 573 /* 574 * Deny any non-PAE frames received prior to 575 * authorization. For open/shared-key 576 * authentication the port is mark authorized 577 * after authentication completes. For 802.1x 578 * the port is not marked authorized by the 579 * authenticator until the handshake has completed. 580 */ 581 if (eh == NULL || 582 eh->ether_type != htons(ETHERTYPE_PAE)) { 583 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 584 ni->ni_macaddr, "data", "unauthorized or " 585 "unknown port: ether type 0x%x len %u", 586 eh == NULL ? -1 : eh->ether_type, 587 m->m_pkthdr.len); 588 vap->iv_stats.is_rx_unauth++; 589 IEEE80211_NODE_STAT(ni, rx_unauth); 590 goto err; 591 } 592 } else { 593 /* 594 * When denying unencrypted frames, discard 595 * any non-PAE frames received without encryption. 596 */ 597 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 598 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 599 (is_hw_decrypted == 0) && 600 (eh == NULL || 601 eh->ether_type != htons(ETHERTYPE_PAE))) { 602 /* 603 * Drop unencrypted frames. 604 */ 605 vap->iv_stats.is_rx_unencrypted++; 606 IEEE80211_NODE_STAT(ni, rx_unencrypted); 607 goto out; 608 } 609 } 610 /* XXX require HT? */ 611 if (qos & IEEE80211_QOS_AMSDU) { 612 m = ieee80211_decap_amsdu(ni, m); 613 if (m == NULL) 614 return IEEE80211_FC0_TYPE_DATA; 615 } else { 616 #ifdef IEEE80211_SUPPORT_SUPERG 617 m = ieee80211_decap_fastframe(vap, ni, m); 618 if (m == NULL) 619 return IEEE80211_FC0_TYPE_DATA; 620 #endif 621 } 622 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 623 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 624 else 625 ieee80211_deliver_data(vap, ni, m); 626 return IEEE80211_FC0_TYPE_DATA; 627 628 case IEEE80211_FC0_TYPE_MGT: 629 vap->iv_stats.is_rx_mgmt++; 630 IEEE80211_NODE_STAT(ni, rx_mgmt); 631 if (dir != IEEE80211_FC1_DIR_NODS) { 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, "data", "incorrect dir 0x%x", dir); 634 vap->iv_stats.is_rx_wrongdir++; 635 goto err; 636 } 637 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 639 ni->ni_macaddr, "mgt", "too short: len %u", 640 m->m_pkthdr.len); 641 vap->iv_stats.is_rx_tooshort++; 642 goto out; 643 } 644 #ifdef IEEE80211_DEBUG 645 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 646 ieee80211_msg_dumppkts(vap)) { 647 net80211_vap_printf(vap, 648 "received %s from %s rssi %d\n", 649 ieee80211_mgt_subtype_name(subtype), 650 ether_sprintf(wh->i_addr2), rssi); 651 } 652 #endif 653 if (IEEE80211_IS_PROTECTED(wh)) { 654 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 655 wh, NULL, "%s", "WEP set but not permitted"); 656 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 657 goto out; 658 } 659 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 660 goto out; 661 662 case IEEE80211_FC0_TYPE_CTL: 663 vap->iv_stats.is_rx_ctl++; 664 IEEE80211_NODE_STAT(ni, rx_ctrl); 665 if (ieee80211_is_ctl_frame_for_vap(ni, m)) 666 vap->iv_recv_ctl(ni, m, subtype); 667 goto out; 668 669 default: 670 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 671 wh, "bad", "frame type 0x%x", type); 672 /* should not come here */ 673 break; 674 } 675 err: 676 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 677 out: 678 if (m != NULL) { 679 if (need_tap && ieee80211_radiotap_active_vap(vap)) 680 ieee80211_radiotap_rx(vap, m); 681 m_freem(m); 682 } 683 return type; 684 } 685 686 static int 687 is11bclient(const uint8_t *rates, const uint8_t *xrates) 688 { 689 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 690 int i; 691 692 /* NB: the 11b clients we care about will not have xrates */ 693 if (xrates != NULL || rates == NULL) 694 return 0; 695 for (i = 0; i < rates[1]; i++) { 696 int r = rates[2+i] & IEEE80211_RATE_VAL; 697 if (r > 2*11 || ((1<<r) & brates) == 0) 698 return 0; 699 } 700 return 1; 701 } 702 703 static void 704 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 705 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 706 { 707 struct ieee80211vap *vap = ni->ni_vap; 708 struct ieee80211com *ic = ni->ni_ic; 709 struct ieee80211_channel *rxchan = ic->ic_curchan; 710 struct ieee80211_frame *wh; 711 uint8_t *frm, *efrm; 712 uint8_t *ssid, *rates, *xrates; 713 #if 0 714 int ht_state_change = 0; 715 #endif 716 717 wh = mtod(m0, struct ieee80211_frame *); 718 frm = (uint8_t *)&wh[1]; 719 efrm = mtod(m0, uint8_t *) + m0->m_len; 720 721 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 722 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n", 723 __func__, 724 wh->i_addr2, ":", 725 ni, 726 ni->ni_macaddr, ":", 727 wh->i_fc[0], 728 wh->i_fc[1]); 729 switch (subtype) { 730 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 731 case IEEE80211_FC0_SUBTYPE_BEACON: { 732 struct ieee80211_scanparams scan; 733 struct ieee80211_channel *c; 734 /* 735 * We process beacon/probe response 736 * frames to discover neighbors. 737 */ 738 if (rxs != NULL) { 739 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 740 if (c != NULL) 741 rxchan = c; 742 } 743 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 744 return; 745 /* 746 * Count frame now that we know it's to be processed. 747 */ 748 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 749 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 750 IEEE80211_NODE_STAT(ni, rx_beacons); 751 } else 752 IEEE80211_NODE_STAT(ni, rx_proberesp); 753 /* 754 * If scanning, just pass information to the scan module. 755 */ 756 if (ic->ic_flags & IEEE80211_F_SCAN) { 757 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 758 /* 759 * Actively scanning a channel marked passive; 760 * send a probe request now that we know there 761 * is 802.11 traffic present. 762 * 763 * XXX check if the beacon we recv'd gives 764 * us what we need and suppress the probe req 765 */ 766 ieee80211_probe_curchan(vap, true); 767 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 768 } 769 ieee80211_add_scan(vap, rxchan, &scan, wh, 770 subtype, rssi, nf); 771 return; 772 } 773 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 774 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 775 /* 776 * Create a new entry in the neighbor table. 777 * 778 * XXX TODO: 779 * 780 * Here we're not scanning; so if we have an 781 * SSID then make sure it matches our SSID. 782 * Otherwise this code will match on all IBSS 783 * beacons/probe requests for all SSIDs, 784 * filling the node table with nodes that 785 * aren't ours. 786 */ 787 if (ieee80211_ibss_node_check_new(ni, &scan)) { 788 ni = ieee80211_add_neighbor(vap, wh, &scan); 789 /* 790 * Send a probe request so we announce 11n 791 * capabilities. 792 */ 793 ieee80211_send_probereq(ni, /* node */ 794 vap->iv_myaddr, /* SA */ 795 ni->ni_macaddr, /* DA */ 796 vap->iv_bss->ni_bssid, /* BSSID */ 797 vap->iv_bss->ni_essid, 798 vap->iv_bss->ni_esslen); /* SSID */ 799 } else 800 ni = NULL; 801 802 /* 803 * Send a probe request so we announce 11n 804 * capabilities. 805 * 806 * Don't do this if we're scanning. 807 */ 808 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 809 ieee80211_send_probereq(ni, /* node */ 810 vap->iv_myaddr, /* SA */ 811 ni->ni_macaddr, /* DA */ 812 vap->iv_bss->ni_bssid, /* BSSID */ 813 vap->iv_bss->ni_essid, 814 vap->iv_bss->ni_esslen); /* SSID */ 815 816 } else if (ni->ni_capinfo == 0) { 817 /* 818 * Update faked node created on transmit. 819 * Note this also updates the tsf. 820 */ 821 ieee80211_init_neighbor(ni, wh, &scan); 822 823 /* 824 * Send a probe request so we announce 11n 825 * capabilities. 826 */ 827 ieee80211_send_probereq(ni, /* node */ 828 vap->iv_myaddr, /* SA */ 829 ni->ni_macaddr, /* DA */ 830 vap->iv_bss->ni_bssid, /* BSSID */ 831 vap->iv_bss->ni_essid, 832 vap->iv_bss->ni_esslen); /* SSID */ 833 } else { 834 /* 835 * Record tsf for potential resync. 836 */ 837 memcpy(ni->ni_tstamp.data, scan.tstamp, 838 sizeof(ni->ni_tstamp)); 839 } 840 /* 841 * This isn't enabled yet - otherwise it would 842 * update the HT parameters and channel width 843 * from any node, which could lead to lots of 844 * strange behaviour if the 11n nodes aren't 845 * exactly configured to match. 846 */ 847 #if 0 848 if (scan.htcap != NULL && scan.htinfo != NULL && 849 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 850 ieee80211_ht_updateparams(ni, 851 scan.htcap, scan.htinfo)); 852 if (ieee80211_ht_updateparams_final(ni, 853 scan.htcap, scan.htinfo)) 854 ht_state_change = 1; 855 } 856 857 /* XXX same for VHT? */ 858 #endif 859 if (ni != NULL) { 860 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 861 ni->ni_noise = nf; 862 } 863 /* 864 * Same here - the channel width change should 865 * be applied to the specific peer node, not 866 * to the ic. Ie, the interface configuration 867 * should stay in its current channel width; 868 * but it should change the rate control and 869 * any queued frames for the given node only. 870 * 871 * Since there's no (current) way to inform 872 * the driver that a channel width change has 873 * occurred for a single node, just stub this 874 * out. 875 */ 876 #if 0 877 if (ht_state_change) 878 ieee80211_update_chw(ic); 879 #endif 880 } 881 break; 882 } 883 884 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 885 if (vap->iv_state != IEEE80211_S_RUN) { 886 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 887 wh, NULL, "wrong state %s", 888 ieee80211_state_name[vap->iv_state]); 889 vap->iv_stats.is_rx_mgtdiscard++; 890 return; 891 } 892 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 893 /* frame must be directed */ 894 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 895 wh, NULL, "%s", "not unicast"); 896 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 897 return; 898 } 899 900 /* 901 * prreq frame format 902 * [tlv] ssid 903 * [tlv] supported rates 904 * [tlv] extended supported rates 905 */ 906 ssid = rates = xrates = NULL; 907 while (efrm - frm > 1) { 908 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 909 switch (*frm) { 910 case IEEE80211_ELEMID_SSID: 911 ssid = frm; 912 break; 913 case IEEE80211_ELEMID_RATES: 914 rates = frm; 915 break; 916 case IEEE80211_ELEMID_XRATES: 917 xrates = frm; 918 break; 919 } 920 frm += frm[1] + 2; 921 } 922 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 923 if (xrates != NULL) 924 IEEE80211_VERIFY_ELEMENT(xrates, 925 IEEE80211_RATE_MAXSIZE - rates[1], return); 926 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 927 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 928 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 929 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 930 wh, NULL, 931 "%s", "no ssid with ssid suppression enabled"); 932 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 933 return; 934 } 935 936 /* XXX find a better class or define it's own */ 937 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 938 "%s", "recv probe req"); 939 /* 940 * Some legacy 11b clients cannot hack a complete 941 * probe response frame. When the request includes 942 * only a bare-bones rate set, communicate this to 943 * the transmit side. 944 */ 945 ieee80211_send_proberesp(vap, wh->i_addr2, 946 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 947 948 /* 949 * Note: we don't benefit from stashing the probe request 950 * IEs away to use for IBSS negotiation, because we 951 * typically don't get all of the IEs. 952 */ 953 break; 954 955 case IEEE80211_FC0_SUBTYPE_ACTION: 956 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 957 if ((ni == vap->iv_bss) && 958 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 959 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 960 wh, NULL, "%s", "unknown node"); 961 vap->iv_stats.is_rx_mgtdiscard++; 962 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 963 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 964 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 965 wh, NULL, "%s", "not for us"); 966 vap->iv_stats.is_rx_mgtdiscard++; 967 } else if (vap->iv_state != IEEE80211_S_RUN) { 968 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 969 wh, NULL, "wrong state %s", 970 ieee80211_state_name[vap->iv_state]); 971 vap->iv_stats.is_rx_mgtdiscard++; 972 } else { 973 if (ieee80211_parse_action(ni, m0) == 0) 974 (void)ic->ic_recv_action(ni, wh, frm, efrm); 975 } 976 break; 977 978 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 979 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 980 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 981 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 982 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 983 case IEEE80211_FC0_SUBTYPE_ATIM: 984 case IEEE80211_FC0_SUBTYPE_DISASSOC: 985 case IEEE80211_FC0_SUBTYPE_AUTH: 986 case IEEE80211_FC0_SUBTYPE_DEAUTH: 987 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 988 wh, NULL, "%s", "not handled"); 989 vap->iv_stats.is_rx_mgtdiscard++; 990 break; 991 992 default: 993 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 994 wh, "mgt", "subtype 0x%x not handled", subtype); 995 vap->iv_stats.is_rx_badsubtype++; 996 break; 997 } 998 } 999 #undef IEEE80211_VERIFY_LENGTH 1000 #undef IEEE80211_VERIFY_ELEMENT 1001 1002 static void 1003 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1004 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1005 { 1006 struct ieee80211vap *vap = ni->ni_vap; 1007 struct ieee80211com *ic = ni->ni_ic; 1008 1009 /* 1010 * Process management frames when scanning; useful for doing 1011 * a site-survey. 1012 */ 1013 if (ic->ic_flags & IEEE80211_F_SCAN) 1014 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 1015 else { 1016 #ifdef IEEE80211_DEBUG 1017 struct ieee80211_frame *wh; 1018 1019 wh = mtod(m0, struct ieee80211_frame *); 1020 #endif 1021 switch (subtype) { 1022 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1023 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1024 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1025 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1026 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1027 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1028 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1029 case IEEE80211_FC0_SUBTYPE_BEACON: 1030 case IEEE80211_FC0_SUBTYPE_ATIM: 1031 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1032 case IEEE80211_FC0_SUBTYPE_AUTH: 1033 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1034 case IEEE80211_FC0_SUBTYPE_ACTION: 1035 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1036 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1037 wh, NULL, "%s", "not handled"); 1038 vap->iv_stats.is_rx_mgtdiscard++; 1039 break; 1040 default: 1041 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1042 wh, "mgt", "subtype 0x%x not handled", subtype); 1043 vap->iv_stats.is_rx_badsubtype++; 1044 break; 1045 } 1046 } 1047 } 1048 1049 static void 1050 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1051 { 1052 1053 switch (subtype) { 1054 case IEEE80211_FC0_SUBTYPE_BAR: 1055 ieee80211_recv_bar(ni, m); 1056 break; 1057 } 1058 } 1059