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/if_private.h> 52 #include <net/ethernet.h> 53 54 #include <net/bpf.h> 55 56 #include <net80211/ieee80211_var.h> 57 #include <net80211/ieee80211_adhoc.h> 58 #include <net80211/ieee80211_input.h> 59 #ifdef IEEE80211_SUPPORT_SUPERG 60 #include <net80211/ieee80211_superg.h> 61 #endif 62 #ifdef IEEE80211_SUPPORT_TDMA 63 #include <net80211/ieee80211_tdma.h> 64 #endif 65 #include <net80211/ieee80211_sta.h> 66 67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 68 69 static void adhoc_vattach(struct ieee80211vap *); 70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 72 const struct ieee80211_rx_stats *, int, int); 73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, const struct ieee80211_rx_stats *, int, int); 75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 77 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 78 79 void 80 ieee80211_adhoc_attach(struct ieee80211com *ic) 81 { 82 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 83 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 84 } 85 86 void 87 ieee80211_adhoc_detach(struct ieee80211com *ic) 88 { 89 } 90 91 static void 92 adhoc_vdetach(struct ieee80211vap *vap) 93 { 94 } 95 96 static void 97 adhoc_vattach(struct ieee80211vap *vap) 98 { 99 vap->iv_newstate = adhoc_newstate; 100 vap->iv_input = adhoc_input; 101 if (vap->iv_opmode == IEEE80211_M_IBSS) 102 vap->iv_recv_mgmt = adhoc_recv_mgmt; 103 else 104 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 105 vap->iv_recv_ctl = adhoc_recv_ctl; 106 vap->iv_opdetach = adhoc_vdetach; 107 #ifdef IEEE80211_SUPPORT_TDMA 108 /* 109 * Throw control to tdma support. Note we do this 110 * after setting up our callbacks so it can piggyback 111 * on top of us. 112 */ 113 if (vap->iv_caps & IEEE80211_C_TDMA) 114 ieee80211_tdma_vattach(vap); 115 #endif 116 } 117 118 static void 119 sta_leave(void *arg, struct ieee80211_node *ni) 120 { 121 struct ieee80211vap *vap = ni->ni_vap; 122 123 if (ni != vap->iv_bss) 124 ieee80211_node_leave(ni); 125 } 126 127 /* 128 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 129 */ 130 static int 131 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 132 { 133 struct ieee80211com *ic = vap->iv_ic; 134 struct ieee80211_node *ni; 135 enum ieee80211_state ostate; 136 137 IEEE80211_LOCK_ASSERT(vap->iv_ic); 138 139 ostate = vap->iv_state; 140 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 141 __func__, ieee80211_state_name[ostate], 142 ieee80211_state_name[nstate], arg); 143 vap->iv_state = nstate; /* state transition */ 144 if (ostate != IEEE80211_S_SCAN) 145 ieee80211_cancel_scan(vap); /* background scan */ 146 ni = vap->iv_bss; /* NB: no reference held */ 147 switch (nstate) { 148 case IEEE80211_S_INIT: 149 switch (ostate) { 150 case IEEE80211_S_SCAN: 151 ieee80211_cancel_scan(vap); 152 break; 153 default: 154 break; 155 } 156 if (ostate != IEEE80211_S_INIT) { 157 /* NB: optimize INIT -> INIT case */ 158 ieee80211_reset_bss(vap); 159 } 160 break; 161 case IEEE80211_S_SCAN: 162 switch (ostate) { 163 case IEEE80211_S_RUN: /* beacon miss */ 164 /* purge station table; entries are stale */ 165 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, 166 sta_leave, NULL); 167 /* fall thru... */ 168 case IEEE80211_S_INIT: 169 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 170 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 171 /* 172 * Already have a channel; bypass the 173 * scan and startup immediately. 174 */ 175 ieee80211_create_ibss(vap, 176 ieee80211_ht_adjust_channel(ic, 177 vap->iv_des_chan, vap->iv_flags_ht)); 178 break; 179 } 180 /* 181 * Initiate a scan. We can come here as a result 182 * of an IEEE80211_IOC_SCAN_REQ too in which case 183 * the vap will be marked with IEEE80211_FEXT_SCANREQ 184 * and the scan request parameters will be present 185 * in iv_scanreq. Otherwise we do the default. 186 */ 187 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 188 ieee80211_check_scan(vap, 189 vap->iv_scanreq_flags, 190 vap->iv_scanreq_duration, 191 vap->iv_scanreq_mindwell, 192 vap->iv_scanreq_maxdwell, 193 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 194 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 195 } else 196 ieee80211_check_scan_current(vap); 197 break; 198 case IEEE80211_S_SCAN: 199 /* 200 * This can happen because of a change in state 201 * that requires a reset. Trigger a new scan 202 * unless we're in manual roaming mode in which 203 * case an application must issue an explicit request. 204 */ 205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 206 ieee80211_check_scan_current(vap); 207 break; 208 default: 209 goto invalid; 210 } 211 break; 212 case IEEE80211_S_RUN: 213 if (vap->iv_flags & IEEE80211_F_WPA) { 214 /* XXX validate prerequisites */ 215 } 216 switch (ostate) { 217 case IEEE80211_S_INIT: 218 /* 219 * Already have a channel; bypass the 220 * scan and startup immediately. 221 * Note that ieee80211_create_ibss will call 222 * back to do a RUN->RUN state change. 223 */ 224 ieee80211_create_ibss(vap, 225 ieee80211_ht_adjust_channel(ic, 226 ic->ic_curchan, vap->iv_flags_ht)); 227 /* NB: iv_bss is changed on return */ 228 ni = vap->iv_bss; 229 break; 230 case IEEE80211_S_SCAN: 231 #ifdef IEEE80211_DEBUG 232 if (ieee80211_msg_debug(vap)) { 233 ieee80211_note(vap, 234 "synchronized with %s ssid ", 235 ether_sprintf(ni->ni_bssid)); 236 ieee80211_print_essid(vap->iv_bss->ni_essid, 237 ni->ni_esslen); 238 printf(" channel %d start %uMbit/s\n", 239 ieee80211_chan2ieee(ic, ic->ic_curchan), 240 ieee80211_node_get_txrate_kbit(ni) / 1000); 241 } 242 #endif 243 break; 244 case IEEE80211_S_RUN: /* IBSS merge */ 245 break; 246 default: 247 goto invalid; 248 } 249 /* 250 * When 802.1x is not in use mark the port authorized 251 * at this point so traffic can flow. 252 */ 253 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 254 ieee80211_node_authorize(ni); 255 /* 256 * Fake association when joining an existing bss. 257 */ 258 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 259 ic->ic_newassoc != NULL) 260 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 261 break; 262 case IEEE80211_S_SLEEP: 263 vap->iv_sta_ps(vap, 0); 264 break; 265 default: 266 invalid: 267 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 268 "%s: unexpected state transition %s -> %s\n", __func__, 269 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 270 break; 271 } 272 return 0; 273 } 274 275 /* 276 * Decide if a received management frame should be 277 * printed when debugging is enabled. This filters some 278 * of the less interesting frames that come frequently 279 * (e.g. beacons). 280 */ 281 static __inline int 282 doprint(struct ieee80211vap *vap, int subtype) 283 { 284 switch (subtype) { 285 case IEEE80211_FC0_SUBTYPE_BEACON: 286 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 287 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 288 return 1; 289 } 290 return 1; 291 } 292 293 /* 294 * Process a received frame. The node associated with the sender 295 * should be supplied. If nothing was found in the node table then 296 * the caller is assumed to supply a reference to iv_bss instead. 297 * The RSSI and a timestamp are also supplied. The RSSI data is used 298 * during AP scanning to select a AP to associate with; it can have 299 * any units so long as values have consistent units and higher values 300 * mean ``better signal''. The receive timestamp is currently not used 301 * by the 802.11 layer. 302 */ 303 static int 304 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 305 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 306 { 307 struct ieee80211vap *vap = ni->ni_vap; 308 struct ieee80211com *ic = ni->ni_ic; 309 struct ifnet *ifp = vap->iv_ifp; 310 struct ieee80211_frame *wh; 311 struct ieee80211_key *key; 312 struct ether_header *eh; 313 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 314 uint8_t dir, type, subtype, qos; 315 uint8_t *bssid; 316 int is_hw_decrypted = 0; 317 int has_decrypted = 0; 318 319 /* 320 * Some devices do hardware decryption all the way through 321 * to pretending the frame wasn't encrypted in the first place. 322 * So, tag it appropriately so it isn't discarded inappropriately. 323 */ 324 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 325 is_hw_decrypted = 1; 326 327 if (m->m_flags & M_AMPDU_MPDU) { 328 /* 329 * Fastpath for A-MPDU reorder q resubmission. Frames 330 * w/ M_AMPDU_MPDU marked have already passed through 331 * here but were received out of order and been held on 332 * the reorder queue. When resubmitted they are marked 333 * with the M_AMPDU_MPDU flag and we can bypass most of 334 * the normal processing. 335 */ 336 wh = mtod(m, struct ieee80211_frame *); 337 type = IEEE80211_FC0_TYPE_DATA; 338 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 339 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA; 340 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 341 goto resubmit_ampdu; 342 } 343 344 KASSERT(ni != NULL, ("null node")); 345 ni->ni_inact = ni->ni_inact_reload; 346 347 type = -1; /* undefined */ 348 349 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 350 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 351 ni->ni_macaddr, NULL, 352 "too short (1): len %u", m->m_pkthdr.len); 353 vap->iv_stats.is_rx_tooshort++; 354 goto out; 355 } 356 /* 357 * Bit of a cheat here, we use a pointer for a 3-address 358 * frame format but don't reference fields past outside 359 * ieee80211_frame_min w/o first validating the data is 360 * present. 361 */ 362 wh = mtod(m, struct ieee80211_frame *); 363 364 if (!IEEE80211_IS_FC0_CHECK_VER(wh, IEEE80211_FC0_VERSION_0)) { 365 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 366 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 367 wh->i_fc[0], wh->i_fc[1]); 368 vap->iv_stats.is_rx_badversion++; 369 goto err; 370 } 371 372 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 373 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 374 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 375 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 376 if (dir != IEEE80211_FC1_DIR_NODS) 377 bssid = wh->i_addr1; 378 else if (type == IEEE80211_FC0_TYPE_CTL) 379 bssid = wh->i_addr1; 380 else { 381 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 382 IEEE80211_DISCARD_MAC(vap, 383 IEEE80211_MSG_ANY, ni->ni_macaddr, 384 NULL, "too short (2): len %u", 385 m->m_pkthdr.len); 386 vap->iv_stats.is_rx_tooshort++; 387 goto out; 388 } 389 bssid = wh->i_addr3; 390 } 391 /* 392 * Validate the bssid. 393 */ 394 if (!(type == IEEE80211_FC0_TYPE_MGT && 395 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 396 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 397 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 398 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 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 if_printf(ifp, "received %s from %s rssi %d\n", 648 ieee80211_mgt_subtype_name(subtype), 649 ether_sprintf(wh->i_addr2), rssi); 650 } 651 #endif 652 if (IEEE80211_IS_PROTECTED(wh)) { 653 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 654 wh, NULL, "%s", "WEP set but not permitted"); 655 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 656 goto out; 657 } 658 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 659 goto out; 660 661 case IEEE80211_FC0_TYPE_CTL: 662 vap->iv_stats.is_rx_ctl++; 663 IEEE80211_NODE_STAT(ni, rx_ctrl); 664 if (ieee80211_is_ctl_frame_for_vap(ni, m)) 665 vap->iv_recv_ctl(ni, m, subtype); 666 goto out; 667 668 default: 669 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 670 wh, "bad", "frame type 0x%x", type); 671 /* should not come here */ 672 break; 673 } 674 err: 675 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 676 out: 677 if (m != NULL) { 678 if (need_tap && ieee80211_radiotap_active_vap(vap)) 679 ieee80211_radiotap_rx(vap, m); 680 m_freem(m); 681 } 682 return type; 683 } 684 685 static int 686 is11bclient(const uint8_t *rates, const uint8_t *xrates) 687 { 688 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 689 int i; 690 691 /* NB: the 11b clients we care about will not have xrates */ 692 if (xrates != NULL || rates == NULL) 693 return 0; 694 for (i = 0; i < rates[1]; i++) { 695 int r = rates[2+i] & IEEE80211_RATE_VAL; 696 if (r > 2*11 || ((1<<r) & brates) == 0) 697 return 0; 698 } 699 return 1; 700 } 701 702 static void 703 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 704 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 705 { 706 struct ieee80211vap *vap = ni->ni_vap; 707 struct ieee80211com *ic = ni->ni_ic; 708 struct ieee80211_channel *rxchan = ic->ic_curchan; 709 struct ieee80211_frame *wh; 710 uint8_t *frm, *efrm; 711 uint8_t *ssid, *rates, *xrates; 712 #if 0 713 int ht_state_change = 0; 714 #endif 715 716 wh = mtod(m0, struct ieee80211_frame *); 717 frm = (uint8_t *)&wh[1]; 718 efrm = mtod(m0, uint8_t *) + m0->m_len; 719 720 IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 721 "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n", 722 __func__, 723 wh->i_addr2, ":", 724 ni, 725 ni->ni_macaddr, ":", 726 wh->i_fc[0], 727 wh->i_fc[1]); 728 switch (subtype) { 729 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 730 case IEEE80211_FC0_SUBTYPE_BEACON: { 731 struct ieee80211_scanparams scan; 732 struct ieee80211_channel *c; 733 /* 734 * We process beacon/probe response 735 * frames to discover neighbors. 736 */ 737 if (rxs != NULL) { 738 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 739 if (c != NULL) 740 rxchan = c; 741 } 742 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 743 return; 744 /* 745 * Count frame now that we know it's to be processed. 746 */ 747 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 748 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 749 IEEE80211_NODE_STAT(ni, rx_beacons); 750 } else 751 IEEE80211_NODE_STAT(ni, rx_proberesp); 752 /* 753 * If scanning, just pass information to the scan module. 754 */ 755 if (ic->ic_flags & IEEE80211_F_SCAN) { 756 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 757 /* 758 * Actively scanning a channel marked passive; 759 * send a probe request now that we know there 760 * is 802.11 traffic present. 761 * 762 * XXX check if the beacon we recv'd gives 763 * us what we need and suppress the probe req 764 */ 765 ieee80211_probe_curchan(vap, true); 766 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 767 } 768 ieee80211_add_scan(vap, rxchan, &scan, wh, 769 subtype, rssi, nf); 770 return; 771 } 772 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 773 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 774 /* 775 * Create a new entry in the neighbor table. 776 * 777 * XXX TODO: 778 * 779 * Here we're not scanning; so if we have an 780 * SSID then make sure it matches our SSID. 781 * Otherwise this code will match on all IBSS 782 * beacons/probe requests for all SSIDs, 783 * filling the node table with nodes that 784 * aren't ours. 785 */ 786 if (ieee80211_ibss_node_check_new(ni, &scan)) { 787 ni = ieee80211_add_neighbor(vap, wh, &scan); 788 /* 789 * Send a probe request so we announce 11n 790 * capabilities. 791 */ 792 ieee80211_send_probereq(ni, /* node */ 793 vap->iv_myaddr, /* SA */ 794 ni->ni_macaddr, /* DA */ 795 vap->iv_bss->ni_bssid, /* BSSID */ 796 vap->iv_bss->ni_essid, 797 vap->iv_bss->ni_esslen); /* SSID */ 798 } else 799 ni = NULL; 800 801 /* 802 * Send a probe request so we announce 11n 803 * capabilities. 804 * 805 * Don't do this if we're scanning. 806 */ 807 if (! (ic->ic_flags & IEEE80211_F_SCAN)) 808 ieee80211_send_probereq(ni, /* node */ 809 vap->iv_myaddr, /* SA */ 810 ni->ni_macaddr, /* DA */ 811 vap->iv_bss->ni_bssid, /* BSSID */ 812 vap->iv_bss->ni_essid, 813 vap->iv_bss->ni_esslen); /* SSID */ 814 815 } else if (ni->ni_capinfo == 0) { 816 /* 817 * Update faked node created on transmit. 818 * Note this also updates the tsf. 819 */ 820 ieee80211_init_neighbor(ni, wh, &scan); 821 822 /* 823 * Send a probe request so we announce 11n 824 * capabilities. 825 */ 826 ieee80211_send_probereq(ni, /* node */ 827 vap->iv_myaddr, /* SA */ 828 ni->ni_macaddr, /* DA */ 829 vap->iv_bss->ni_bssid, /* BSSID */ 830 vap->iv_bss->ni_essid, 831 vap->iv_bss->ni_esslen); /* SSID */ 832 } else { 833 /* 834 * Record tsf for potential resync. 835 */ 836 memcpy(ni->ni_tstamp.data, scan.tstamp, 837 sizeof(ni->ni_tstamp)); 838 } 839 /* 840 * This isn't enabled yet - otherwise it would 841 * update the HT parameters and channel width 842 * from any node, which could lead to lots of 843 * strange behaviour if the 11n nodes aren't 844 * exactly configured to match. 845 */ 846 #if 0 847 if (scan.htcap != NULL && scan.htinfo != NULL && 848 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 849 ieee80211_ht_updateparams(ni, 850 scan.htcap, scan.htinfo)); 851 if (ieee80211_ht_updateparams_final(ni, 852 scan.htcap, scan.htinfo)) 853 ht_state_change = 1; 854 } 855 856 /* XXX same for VHT? */ 857 #endif 858 if (ni != NULL) { 859 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 860 ni->ni_noise = nf; 861 } 862 /* 863 * Same here - the channel width change should 864 * be applied to the specific peer node, not 865 * to the ic. Ie, the interface configuration 866 * should stay in its current channel width; 867 * but it should change the rate control and 868 * any queued frames for the given node only. 869 * 870 * Since there's no (current) way to inform 871 * the driver that a channel width change has 872 * occurred for a single node, just stub this 873 * out. 874 */ 875 #if 0 876 if (ht_state_change) 877 ieee80211_update_chw(ic); 878 #endif 879 } 880 break; 881 } 882 883 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 884 if (vap->iv_state != IEEE80211_S_RUN) { 885 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 886 wh, NULL, "wrong state %s", 887 ieee80211_state_name[vap->iv_state]); 888 vap->iv_stats.is_rx_mgtdiscard++; 889 return; 890 } 891 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 892 /* frame must be directed */ 893 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 894 wh, NULL, "%s", "not unicast"); 895 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 896 return; 897 } 898 899 /* 900 * prreq frame format 901 * [tlv] ssid 902 * [tlv] supported rates 903 * [tlv] extended supported rates 904 */ 905 ssid = rates = xrates = NULL; 906 while (efrm - frm > 1) { 907 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 908 switch (*frm) { 909 case IEEE80211_ELEMID_SSID: 910 ssid = frm; 911 break; 912 case IEEE80211_ELEMID_RATES: 913 rates = frm; 914 break; 915 case IEEE80211_ELEMID_XRATES: 916 xrates = frm; 917 break; 918 } 919 frm += frm[1] + 2; 920 } 921 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 922 if (xrates != NULL) 923 IEEE80211_VERIFY_ELEMENT(xrates, 924 IEEE80211_RATE_MAXSIZE - rates[1], return); 925 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 926 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 927 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 928 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 929 wh, NULL, 930 "%s", "no ssid with ssid suppression enabled"); 931 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 932 return; 933 } 934 935 /* XXX find a better class or define it's own */ 936 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 937 "%s", "recv probe req"); 938 /* 939 * Some legacy 11b clients cannot hack a complete 940 * probe response frame. When the request includes 941 * only a bare-bones rate set, communicate this to 942 * the transmit side. 943 */ 944 ieee80211_send_proberesp(vap, wh->i_addr2, 945 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 946 947 /* 948 * Note: we don't benefit from stashing the probe request 949 * IEs away to use for IBSS negotiation, because we 950 * typically don't get all of the IEs. 951 */ 952 break; 953 954 case IEEE80211_FC0_SUBTYPE_ACTION: 955 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 956 if ((ni == vap->iv_bss) && 957 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 958 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 959 wh, NULL, "%s", "unknown node"); 960 vap->iv_stats.is_rx_mgtdiscard++; 961 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 962 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 963 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 964 wh, NULL, "%s", "not for us"); 965 vap->iv_stats.is_rx_mgtdiscard++; 966 } else if (vap->iv_state != IEEE80211_S_RUN) { 967 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG, 968 wh, NULL, "wrong state %s", 969 ieee80211_state_name[vap->iv_state]); 970 vap->iv_stats.is_rx_mgtdiscard++; 971 } else { 972 if (ieee80211_parse_action(ni, m0) == 0) 973 (void)ic->ic_recv_action(ni, wh, frm, efrm); 974 } 975 break; 976 977 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 978 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 979 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 980 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 981 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 982 case IEEE80211_FC0_SUBTYPE_ATIM: 983 case IEEE80211_FC0_SUBTYPE_DISASSOC: 984 case IEEE80211_FC0_SUBTYPE_AUTH: 985 case IEEE80211_FC0_SUBTYPE_DEAUTH: 986 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 987 wh, NULL, "%s", "not handled"); 988 vap->iv_stats.is_rx_mgtdiscard++; 989 break; 990 991 default: 992 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 993 wh, "mgt", "subtype 0x%x not handled", subtype); 994 vap->iv_stats.is_rx_badsubtype++; 995 break; 996 } 997 } 998 #undef IEEE80211_VERIFY_LENGTH 999 #undef IEEE80211_VERIFY_ELEMENT 1000 1001 static void 1002 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 1003 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 1004 { 1005 struct ieee80211vap *vap = ni->ni_vap; 1006 struct ieee80211com *ic = ni->ni_ic; 1007 1008 /* 1009 * Process management frames when scanning; useful for doing 1010 * a site-survey. 1011 */ 1012 if (ic->ic_flags & IEEE80211_F_SCAN) 1013 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 1014 else { 1015 #ifdef IEEE80211_DEBUG 1016 struct ieee80211_frame *wh; 1017 1018 wh = mtod(m0, struct ieee80211_frame *); 1019 #endif 1020 switch (subtype) { 1021 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1022 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 1023 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1024 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1025 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1026 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1027 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1028 case IEEE80211_FC0_SUBTYPE_BEACON: 1029 case IEEE80211_FC0_SUBTYPE_ATIM: 1030 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1031 case IEEE80211_FC0_SUBTYPE_AUTH: 1032 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1033 case IEEE80211_FC0_SUBTYPE_ACTION: 1034 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1035 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1036 wh, NULL, "%s", "not handled"); 1037 vap->iv_stats.is_rx_mgtdiscard++; 1038 break; 1039 default: 1040 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1041 wh, "mgt", "subtype 0x%x not handled", subtype); 1042 vap->iv_stats.is_rx_badsubtype++; 1043 break; 1044 } 1045 } 1046 } 1047 1048 static void 1049 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1050 { 1051 1052 switch (subtype) { 1053 case IEEE80211_FC0_SUBTYPE_BAR: 1054 ieee80211_recv_bar(ni, m); 1055 break; 1056 } 1057 } 1058