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sys/net80211/ieee80211_adhoc.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #include <sys/cdefs.h> 29 #ifdef __FreeBSD__ 30 __FBSDID("$FreeBSD: releng/12.0/sys/net80211/ieee80211_adhoc.c 326272 2017-11-27 15:23:17Z pfg $"); 31 #endif 32 33 /* 34 * IEEE 802.11 IBSS mode support. 35 */ 36 #include "opt_inet.h" 37 #include "opt_wlan.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/endian.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_var.h> 54 #include <net/if_media.h> 55 #include <net/if_llc.h> 56 #include <net/ethernet.h> 57 58 #include <net/bpf.h> 59 60 #include <net80211/ieee80211_var.h> 61 #include <net80211/ieee80211_adhoc.h> 62 #include <net80211/ieee80211_input.h> 63 #ifdef IEEE80211_SUPPORT_SUPERG 64 #include <net80211/ieee80211_superg.h> 65 #endif 66 #ifdef IEEE80211_SUPPORT_TDMA 67 #include <net80211/ieee80211_tdma.h> 68 #endif 69 #include <net80211/ieee80211_sta.h> 70 71 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 72 73 static void adhoc_vattach(struct ieee80211vap *); 74 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 75 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 76 const struct ieee80211_rx_stats *, int, int); 77 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 78 int subtype, const struct ieee80211_rx_stats *, int, int); 79 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 80 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 81 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 82 83 void 84 ieee80211_adhoc_attach(struct ieee80211com *ic) 85 { 86 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 87 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 88 } 89 90 void 91 ieee80211_adhoc_detach(struct ieee80211com *ic) 92 { 93 } 94 95 static void 96 adhoc_vdetach(struct ieee80211vap *vap) 97 { 98 } 99 100 static void 101 adhoc_vattach(struct ieee80211vap *vap) 102 { 103 vap->iv_newstate = adhoc_newstate; 104 vap->iv_input = adhoc_input; 105 if (vap->iv_opmode == IEEE80211_M_IBSS) 106 vap->iv_recv_mgmt = adhoc_recv_mgmt; 107 else 108 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 109 vap->iv_recv_ctl = adhoc_recv_ctl; 110 vap->iv_opdetach = adhoc_vdetach; 111 #ifdef IEEE80211_SUPPORT_TDMA 112 /* 113 * Throw control to tdma support. Note we do this 114 * after setting up our callbacks so it can piggyback 115 * on top of us. 116 */ 117 if (vap->iv_caps & IEEE80211_C_TDMA) 118 ieee80211_tdma_vattach(vap); 119 #endif 120 } 121 122 static void 123 sta_leave(void *arg, struct ieee80211_node *ni) 124 { 125 struct ieee80211vap *vap = ni->ni_vap; 126 127 if (ni != vap->iv_bss) 128 ieee80211_node_leave(ni); 129 } 130 131 /* 132 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 133 */ 134 static int 135 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 136 { 137 struct ieee80211com *ic = vap->iv_ic; 138 struct ieee80211_node *ni; 139 enum ieee80211_state ostate; 140 141 IEEE80211_LOCK_ASSERT(vap->iv_ic); 142 143 ostate = vap->iv_state; 144 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 145 __func__, ieee80211_state_name[ostate], 146 ieee80211_state_name[nstate], arg); 147 vap->iv_state = nstate; /* state transition */ 148 if (ostate != IEEE80211_S_SCAN) 149 ieee80211_cancel_scan(vap); /* background scan */ 150 ni = vap->iv_bss; /* NB: no reference held */ 151 switch (nstate) { 152 case IEEE80211_S_INIT: 153 switch (ostate) { 154 case IEEE80211_S_SCAN: 155 ieee80211_cancel_scan(vap); 156 break; 157 default: 158 break; 159 } 160 if (ostate != IEEE80211_S_INIT) { 161 /* NB: optimize INIT -> INIT case */ 162 ieee80211_reset_bss(vap); 163 } 164 break; 165 case IEEE80211_S_SCAN: 166 switch (ostate) { 167 case IEEE80211_S_RUN: /* beacon miss */ 168 /* purge station table; entries are stale */ 169 ieee80211_iterate_nodes_vap(&ic->ic_sta, vap, 170 sta_leave, NULL); 171 /* fall thru... */ 172 case IEEE80211_S_INIT: 173 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 174 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 175 /* 176 * Already have a channel; bypass the 177 * scan and startup immediately. 178 */ 179 ieee80211_create_ibss(vap, 180 ieee80211_ht_adjust_channel(ic, 181 vap->iv_des_chan, vap->iv_flags_ht)); 182 break; 183 } 184 /* 185 * Initiate a scan. We can come here as a result 186 * of an IEEE80211_IOC_SCAN_REQ too in which case 187 * the vap will be marked with IEEE80211_FEXT_SCANREQ 188 * and the scan request parameters will be present 189 * in iv_scanreq. Otherwise we do the default. 190 */ 191 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 192 ieee80211_check_scan(vap, 193 vap->iv_scanreq_flags, 194 vap->iv_scanreq_duration, 195 vap->iv_scanreq_mindwell, 196 vap->iv_scanreq_maxdwell, 197 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 198 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 199 } else 200 ieee80211_check_scan_current(vap); 201 break; 202 case IEEE80211_S_SCAN: 203 /* 204 * This can happen because of a change in state 205 * that requires a reset. Trigger a new scan 206 * unless we're in manual roaming mode in which 207 * case an application must issue an explicit request. 208 */ 209 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 210 ieee80211_check_scan_current(vap); 211 break; 212 default: 213 goto invalid; 214 } 215 break; 216 case IEEE80211_S_RUN: 217 if (vap->iv_flags & IEEE80211_F_WPA) { 218 /* XXX validate prerequisites */ 219 } 220 switch (ostate) { 221 case IEEE80211_S_INIT: 222 /* 223 * Already have a channel; bypass the 224 * scan and startup immediately. 225 * Note that ieee80211_create_ibss will call 226 * back to do a RUN->RUN state change. 227 */ 228 ieee80211_create_ibss(vap, 229 ieee80211_ht_adjust_channel(ic, 230 ic->ic_curchan, vap->iv_flags_ht)); 231 /* NB: iv_bss is changed on return */ 232 ni = vap->iv_bss; 233 break; 234 case IEEE80211_S_SCAN: 235 #ifdef IEEE80211_DEBUG 236 if (ieee80211_msg_debug(vap)) { 237 ieee80211_note(vap, 238 "synchronized with %s ssid ", 239 ether_sprintf(ni->ni_bssid)); 240 ieee80211_print_essid(vap->iv_bss->ni_essid, 241 ni->ni_esslen); 242 /* XXX MCS/HT */ 243 printf(" channel %d start %uMb\n", 244 ieee80211_chan2ieee(ic, ic->ic_curchan), 245 IEEE80211_RATE2MBS(ni->ni_txrate)); 246 } 247 #endif 248 break; 249 case IEEE80211_S_RUN: /* IBSS merge */ 250 break; 251 default: 252 goto invalid; 253 } 254 /* 255 * When 802.1x is not in use mark the port authorized 256 * at this point so traffic can flow. 257 */ 258 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 259 ieee80211_node_authorize(ni); 260 /* 261 * Fake association when joining an existing bss. 262 */ 263 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 264 ic->ic_newassoc != NULL) 265 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 266 break; 267 case IEEE80211_S_SLEEP: 268 vap->iv_sta_ps(vap, 0); 269 break; 270 default: 271 invalid: 272 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 273 "%s: unexpected state transition %s -> %s\n", __func__, 274 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 275 break; 276 } 277 return 0; 278 } 279 280 /* 281 * Decide if a received management frame should be 282 * printed when debugging is enabled. This filters some 283 * of the less interesting frames that come frequently 284 * (e.g. beacons). 285 */ 286 static __inline int 287 doprint(struct ieee80211vap *vap, int subtype) 288 { 289 switch (subtype) { 290 case IEEE80211_FC0_SUBTYPE_BEACON: 291 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 292 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 293 return 1; 294 } 295 return 1; 296 } 297 298 /* 299 * Process a received frame. The node associated with the sender 300 * should be supplied. If nothing was found in the node table then 301 * the caller is assumed to supply a reference to iv_bss instead. 302 * The RSSI and a timestamp are also supplied. The RSSI data is used 303 * during AP scanning to select a AP to associate with; it can have 304 * any units so long as values have consistent units and higher values 305 * mean ``better signal''. The receive timestamp is currently not used 306 * by the 802.11 layer. 307 */ 308 static int 309 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 310 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 311 { 312 struct ieee80211vap *vap = ni->ni_vap; 313 struct ieee80211com *ic = ni->ni_ic; 314 struct ifnet *ifp = vap->iv_ifp; 315 struct ieee80211_frame *wh; 316 struct ieee80211_key *key; 317 struct ether_header *eh; 318 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 319 uint8_t dir, type, subtype, qos; 320 uint8_t *bssid; 321 int is_hw_decrypted = 0; 322 int has_decrypted = 0; 323 324 /* 325 * Some devices do hardware decryption all the way through 326 * to pretending the frame wasn't encrypted in the first place. 327 * So, tag it appropriately so it isn't discarded inappropriately. 328 */ 329 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 330 is_hw_decrypted = 1; 331 332 if (m->m_flags & M_AMPDU_MPDU) { 333 /* 334 * Fastpath for A-MPDU reorder q resubmission. Frames 335 * w/ M_AMPDU_MPDU marked have already passed through 336 * here but were received out of order and been held on 337 * the reorder queue. When resubmitted they are marked 338 * with the M_AMPDU_MPDU flag and we can bypass most of 339 * the normal processing. 340 */ 341 wh = mtod(m, struct ieee80211_frame *); 342 type = IEEE80211_FC0_TYPE_DATA; 343 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 344 subtype = IEEE80211_FC0_SUBTYPE_QOS; 345 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 346 goto resubmit_ampdu; 347 } 348 349 KASSERT(ni != NULL, ("null node")); 350 ni->ni_inact = ni->ni_inact_reload; 351 352 type = -1; /* undefined */ 353 354 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 355 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 356 ni->ni_macaddr, NULL, 357 "too short (1): len %u", m->m_pkthdr.len); 358 vap->iv_stats.is_rx_tooshort++; 359 goto out; 360 } 361 /* 362 * Bit of a cheat here, we use a pointer for a 3-address 363 * frame format but don't reference fields past outside 364 * ieee80211_frame_min w/o first validating the data is 365 * present. 366 */ 367 wh = mtod(m, struct ieee80211_frame *); 368 369 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 370 IEEE80211_FC0_VERSION_0) { 371 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 372 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 373 wh->i_fc[0], wh->i_fc[1]); 374 vap->iv_stats.is_rx_badversion++; 375 goto err; 376 } 377 378 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 379 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 380 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 381 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 382 if (dir != IEEE80211_FC1_DIR_NODS) 383 bssid = wh->i_addr1; 384 else if (type == IEEE80211_FC0_TYPE_CTL) 385 bssid = wh->i_addr1; 386 else { 387 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 388 IEEE80211_DISCARD_MAC(vap, 389 IEEE80211_MSG_ANY, ni->ni_macaddr, 390 NULL, "too short (2): len %u", 391 m->m_pkthdr.len); 392 vap->iv_stats.is_rx_tooshort++; 393 goto out; 394 } 395 bssid = wh->i_addr3; 396 } 397 /* 398 * Validate the bssid. 399 */ 400 if (!(type == IEEE80211_FC0_TYPE_MGT && 401 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 402 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 403 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 404 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 405 /* not interested in */ 406 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 407 bssid, NULL, "%s", "not to bss"); 408 vap->iv_stats.is_rx_wrongbss++; 409 goto out; 410 } 411 /* 412 * Data frame, cons up a node when it doesn't 413 * exist. This should probably done after an ACL check. 414 */ 415 if (type == IEEE80211_FC0_TYPE_DATA && 416 ni == vap->iv_bss && 417 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 418 /* 419 * Beware of frames that come in too early; we 420 * can receive broadcast frames and creating sta 421 * entries will blow up because there is no bss 422 * channel yet. 423 */ 424 if (vap->iv_state != IEEE80211_S_RUN) { 425 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 426 wh, "data", "not in RUN state (%s)", 427 ieee80211_state_name[vap->iv_state]); 428 vap->iv_stats.is_rx_badstate++; 429 goto err; 430 } 431 /* 432 * Fake up a node for this newly discovered member 433 * of the IBSS. 434 * 435 * Note: This doesn't "upgrade" the node to 11n; 436 * that will happen after a probe request/response 437 * exchange. 438 */ 439 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 440 if (ni == NULL) { 441 /* NB: stat kept for alloc failure */ 442 goto err; 443 } 444 } 445 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 446 ni->ni_noise = nf; 447 if (IEEE80211_HAS_SEQ(type, subtype) && 448 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 449 uint8_t tid = ieee80211_gettid(wh); 450 if (IEEE80211_QOS_HAS_SEQ(wh) && 451 TID_TO_WME_AC(tid) >= WME_AC_VI) 452 ic->ic_wme.wme_hipri_traffic++; 453 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 454 goto out; 455 } 456 } 457 458 switch (type) { 459 case IEEE80211_FC0_TYPE_DATA: 460 hdrspace = ieee80211_hdrspace(ic, wh); 461 if (m->m_len < hdrspace && 462 (m = m_pullup(m, hdrspace)) == NULL) { 463 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 464 ni->ni_macaddr, NULL, 465 "data too short: expecting %u", hdrspace); 466 vap->iv_stats.is_rx_tooshort++; 467 goto out; /* XXX */ 468 } 469 if (dir != IEEE80211_FC1_DIR_NODS) { 470 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 471 wh, "data", "incorrect dir 0x%x", dir); 472 vap->iv_stats.is_rx_wrongdir++; 473 goto out; 474 } 475 /* XXX no power-save support */ 476 477 /* 478 * Handle A-MPDU re-ordering. If the frame is to be 479 * processed directly then ieee80211_ampdu_reorder 480 * will return 0; otherwise it has consumed the mbuf 481 * and we should do nothing more with it. 482 */ 483 if ((m->m_flags & M_AMPDU) && 484 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 485 m = NULL; 486 goto out; 487 } 488 resubmit_ampdu: 489 490 /* 491 * Handle privacy requirements. Note that we 492 * must not be preempted from here until after 493 * we (potentially) call ieee80211_crypto_demic; 494 * otherwise we may violate assumptions in the 495 * crypto cipher modules used to do delayed update 496 * of replay sequence numbers. 497 */ 498 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 499 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 500 /* 501 * Discard encrypted frames when privacy is off. 502 */ 503 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 504 wh, "WEP", "%s", "PRIVACY off"); 505 vap->iv_stats.is_rx_noprivacy++; 506 IEEE80211_NODE_STAT(ni, rx_noprivacy); 507 goto out; 508 } 509 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 510 /* NB: stats+msgs handled in crypto_decap */ 511 IEEE80211_NODE_STAT(ni, rx_wepfail); 512 goto out; 513 } 514 wh = mtod(m, struct ieee80211_frame *); 515 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 516 has_decrypted = 1; 517 } else { 518 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 519 key = NULL; 520 } 521 522 /* 523 * Save QoS bits for use below--before we strip the header. 524 */ 525 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 526 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 527 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 528 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 529 } else 530 qos = 0; 531 532 /* 533 * Next up, any fragmentation. 534 */ 535 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 536 m = ieee80211_defrag(ni, m, hdrspace); 537 if (m == NULL) { 538 /* Fragment dropped or frame not complete yet */ 539 goto out; 540 } 541 } 542 wh = NULL; /* no longer valid, catch any uses */ 543 544 /* 545 * Next strip any MSDU crypto bits. 546 */ 547 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 548 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 549 ni->ni_macaddr, "data", "%s", "demic error"); 550 vap->iv_stats.is_rx_demicfail++; 551 IEEE80211_NODE_STAT(ni, rx_demicfail); 552 goto out; 553 } 554 555 /* copy to listener after decrypt */ 556 if (ieee80211_radiotap_active_vap(vap)) 557 ieee80211_radiotap_rx(vap, m); 558 need_tap = 0; 559 560 /* 561 * Finally, strip the 802.11 header. 562 */ 563 m = ieee80211_decap(vap, m, hdrspace); 564 if (m == NULL) { 565 /* XXX mask bit to check for both */ 566 /* don't count Null data frames as errors */ 567 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 568 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 569 goto out; 570 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 571 ni->ni_macaddr, "data", "%s", "decap error"); 572 vap->iv_stats.is_rx_decap++; 573 IEEE80211_NODE_STAT(ni, rx_decap); 574 goto err; 575 } 576 eh = mtod(m, struct ether_header *); 577 if (!ieee80211_node_is_authorized(ni)) { 578 /* 579 * Deny any non-PAE frames received prior to 580 * authorization. For open/shared-key 581 * authentication the port is mark authorized 582 * after authentication completes. For 802.1x 583 * the port is not marked authorized by the 584 * authenticator until the handshake has completed. 585 */ 586 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 587 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 588 eh->ether_shost, "data", 589 "unauthorized port: ether type 0x%x len %u", 590 eh->ether_type, m->m_pkthdr.len); 591 vap->iv_stats.is_rx_unauth++; 592 IEEE80211_NODE_STAT(ni, rx_unauth); 593 goto err; 594 } 595 } else { 596 /* 597 * When denying unencrypted frames, discard 598 * any non-PAE frames received without encryption. 599 */ 600 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 601 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 602 (is_hw_decrypted == 0) && 603 eh->ether_type != htons(ETHERTYPE_PAE)) { 604 /* 605 * Drop unencrypted frames. 606 */ 607 vap->iv_stats.is_rx_unencrypted++; 608 IEEE80211_NODE_STAT(ni, rx_unencrypted); 609 goto out; 610 } 611 } 612 /* XXX require HT? */ 613 if (qos & IEEE80211_QOS_AMSDU) { 614 m = ieee80211_decap_amsdu(ni, m); 615 if (m == NULL) 616 return IEEE80211_FC0_TYPE_DATA; 617 } else { 618 #ifdef IEEE80211_SUPPORT_SUPERG 619 m = ieee80211_decap_fastframe(vap, ni, m); 620 if (m == NULL) 621 return IEEE80211_FC0_TYPE_DATA; 622 #endif 623 } 624 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 625 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 626 else 627 ieee80211_deliver_data(vap, ni, m); 628 return IEEE80211_FC0_TYPE_DATA; 629 630 case IEEE80211_FC0_TYPE_MGT: 631 vap->iv_stats.is_rx_mgmt++; 632 IEEE80211_NODE_STAT(ni, rx_mgmt); 633 if (dir != IEEE80211_FC1_DIR_NODS) { 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 635 wh, "data", "incorrect dir 0x%x", dir); 636 vap->iv_stats.is_rx_wrongdir++; 637 goto err; 638 } 639 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 640 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 641 ni->ni_macaddr, "mgt", "too short: len %u", 642 m->m_pkthdr.len); 643 vap->iv_stats.is_rx_tooshort++; 644 goto out; 645 } 646 #ifdef IEEE80211_DEBUG 647 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 648 ieee80211_msg_dumppkts(vap)) { 649 if_printf(ifp, "received %s from %s rssi %d\n", 650 ieee80211_mgt_subtype_name(subtype), 651 ether_sprintf(wh->i_addr2), rssi); 652 } 653 #endif 654 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 655 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 656 wh, NULL, "%s", "WEP set but not permitted"); 657 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 658 goto out; 659 } 660 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 661 goto out; 662 663 case IEEE80211_FC0_TYPE_CTL: 664 vap->iv_stats.is_rx_ctl++; 665 IEEE80211_NODE_STAT(ni, rx_ctrl); 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 switch (subtype) { 721 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 722 case IEEE80211_FC0_SUBTYPE_BEACON: { 723 struct ieee80211_scanparams scan; 724 struct ieee80211_channel *c; 725 /* 726 * We process beacon/probe response 727 * frames to discover neighbors. 728 */ 729 if (rxs != NULL) { 730 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 731 if (c != NULL) 732 rxchan = c; 733 } 734 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 735 return; 736 /* 737 * Count frame now that we know it's to be processed. 738 */ 739 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 740 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 741 IEEE80211_NODE_STAT(ni, rx_beacons); 742 } else 743 IEEE80211_NODE_STAT(ni, rx_proberesp); 744 /* 745 * If scanning, just pass information to the scan module. 746 */ 747 if (ic->ic_flags & IEEE80211_F_SCAN) { 748 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 749 /* 750 * Actively scanning a channel marked passive; 751 * send a probe request now that we know there 752 * is 802.11 traffic present. 753 * 754 * XXX check if the beacon we recv'd gives 755 * us what we need and suppress the probe req 756 */ 757 ieee80211_probe_curchan(vap, 1); 758 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 759 } 760 ieee80211_add_scan(vap, rxchan, &scan, wh, 761 subtype, rssi, nf); 762 return; 763 } 764 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 765 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 766 /* 767 * Create a new entry in the neighbor table. 768 * 769 * XXX TODO: 770 * 771 * Here we're not scanning; so if we have an 772 * SSID then make sure it matches our SSID. 773 * Otherwise this code will match on all IBSS 774 * beacons/probe requests for all SSIDs, 775 * filling the node table with nodes that 776 * aren't ours. 777 */ 778 if (ieee80211_ibss_node_check_new(ni, &scan)) { 779 ni = ieee80211_add_neighbor(vap, wh, &scan); 780 /* 781 * Send a probe request so we announce 11n 782 * capabilities. 783 */ 784 ieee80211_send_probereq(ni, /* node */ 785 vap->iv_myaddr, /* SA */ 786 ni->ni_macaddr, /* DA */ 787 vap->iv_bss->ni_bssid, /* BSSID */ 788 vap->iv_bss->ni_essid, 789 vap->iv_bss->ni_esslen); /* SSID */ 790 } else 791 ni = NULL; 792 793 } else if (ni->ni_capinfo == 0) { 794 /* 795 * Update faked node created on transmit. 796 * Note this also updates the tsf. 797 */ 798 ieee80211_init_neighbor(ni, wh, &scan); 799 800 /* 801 * Send a probe request so we announce 11n 802 * capabilities. 803 */ 804 ieee80211_send_probereq(ni, /* node */ 805 vap->iv_myaddr, /* SA */ 806 ni->ni_macaddr, /* DA */ 807 vap->iv_bss->ni_bssid, /* BSSID */ 808 vap->iv_bss->ni_essid, 809 vap->iv_bss->ni_esslen); /* SSID */ 810 } else { 811 /* 812 * Record tsf for potential resync. 813 */ 814 memcpy(ni->ni_tstamp.data, scan.tstamp, 815 sizeof(ni->ni_tstamp)); 816 } 817 /* 818 * This isn't enabled yet - otherwise it would 819 * update the HT parameters and channel width 820 * from any node, which could lead to lots of 821 * strange behaviour if the 11n nodes aren't 822 * exactly configured to match. 823 */ 824 #if 0 825 if (scan.htcap != NULL && scan.htinfo != NULL && 826 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 827 ieee80211_ht_updateparams(ni, 828 scan.htcap, scan.htinfo)); 829 if (ieee80211_ht_updateparams_final(ni, 830 scan.htcap, scan.htinfo)) 831 ht_state_change = 1; 832 } 833 834 /* XXX same for VHT? */ 835 #endif 836 if (ni != NULL) { 837 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 838 ni->ni_noise = nf; 839 } 840 /* 841 * Same here - the channel width change should 842 * be applied to the specific peer node, not 843 * to the ic. Ie, the interface configuration 844 * should stay in its current channel width; 845 * but it should change the rate control and 846 * any queued frames for the given node only. 847 * 848 * Since there's no (current) way to inform 849 * the driver that a channel width change has 850 * occurred for a single node, just stub this 851 * out. 852 */ 853 #if 0 854 if (ht_state_change) 855 ieee80211_update_chw(ic); 856 #endif 857 } 858 break; 859 } 860 861 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 862 if (vap->iv_state != IEEE80211_S_RUN) { 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, NULL, "wrong state %s", 865 ieee80211_state_name[vap->iv_state]); 866 vap->iv_stats.is_rx_mgtdiscard++; 867 return; 868 } 869 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 870 /* frame must be directed */ 871 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 872 wh, NULL, "%s", "not unicast"); 873 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 874 return; 875 } 876 877 /* 878 * prreq frame format 879 * [tlv] ssid 880 * [tlv] supported rates 881 * [tlv] extended supported rates 882 */ 883 ssid = rates = xrates = NULL; 884 while (efrm - frm > 1) { 885 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 886 switch (*frm) { 887 case IEEE80211_ELEMID_SSID: 888 ssid = frm; 889 break; 890 case IEEE80211_ELEMID_RATES: 891 rates = frm; 892 break; 893 case IEEE80211_ELEMID_XRATES: 894 xrates = frm; 895 break; 896 } 897 frm += frm[1] + 2; 898 } 899 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 900 if (xrates != NULL) 901 IEEE80211_VERIFY_ELEMENT(xrates, 902 IEEE80211_RATE_MAXSIZE - rates[1], return); 903 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 904 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 905 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 906 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 907 wh, NULL, 908 "%s", "no ssid with ssid suppression enabled"); 909 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 910 return; 911 } 912 913 /* XXX find a better class or define it's own */ 914 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 915 "%s", "recv probe req"); 916 /* 917 * Some legacy 11b clients cannot hack a complete 918 * probe response frame. When the request includes 919 * only a bare-bones rate set, communicate this to 920 * the transmit side. 921 */ 922 ieee80211_send_proberesp(vap, wh->i_addr2, 923 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 924 925 /* 926 * Note: we don't benefit from stashing the probe request 927 * IEs away to use for IBSS negotiation, because we 928 * typically don't get all of the IEs. 929 */ 930 break; 931 932 case IEEE80211_FC0_SUBTYPE_ACTION: 933 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 934 if ((ni == vap->iv_bss) && 935 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 936 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 937 wh, NULL, "%s", "unknown node"); 938 vap->iv_stats.is_rx_mgtdiscard++; 939 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 940 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 941 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 942 wh, NULL, "%s", "not for us"); 943 vap->iv_stats.is_rx_mgtdiscard++; 944 } else if (vap->iv_state != IEEE80211_S_RUN) { 945 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 946 wh, NULL, "wrong state %s", 947 ieee80211_state_name[vap->iv_state]); 948 vap->iv_stats.is_rx_mgtdiscard++; 949 } else { 950 if (ieee80211_parse_action(ni, m0) == 0) 951 (void)ic->ic_recv_action(ni, wh, frm, efrm); 952 } 953 break; 954 955 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 956 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 957 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 958 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 959 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 960 case IEEE80211_FC0_SUBTYPE_ATIM: 961 case IEEE80211_FC0_SUBTYPE_DISASSOC: 962 case IEEE80211_FC0_SUBTYPE_AUTH: 963 case IEEE80211_FC0_SUBTYPE_DEAUTH: 964 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 965 wh, NULL, "%s", "not handled"); 966 vap->iv_stats.is_rx_mgtdiscard++; 967 break; 968 969 default: 970 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 971 wh, "mgt", "subtype 0x%x not handled", subtype); 972 vap->iv_stats.is_rx_badsubtype++; 973 break; 974 } 975 } 976 #undef IEEE80211_VERIFY_LENGTH 977 #undef IEEE80211_VERIFY_ELEMENT 978 979 static void 980 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 981 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 982 { 983 struct ieee80211vap *vap = ni->ni_vap; 984 struct ieee80211com *ic = ni->ni_ic; 985 struct ieee80211_frame *wh; 986 987 /* 988 * Process management frames when scanning; useful for doing 989 * a site-survey. 990 */ 991 if (ic->ic_flags & IEEE80211_F_SCAN) 992 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 993 else { 994 wh = mtod(m0, struct ieee80211_frame *); 995 switch (subtype) { 996 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 997 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 998 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 999 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 1000 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 1001 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1002 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1003 case IEEE80211_FC0_SUBTYPE_BEACON: 1004 case IEEE80211_FC0_SUBTYPE_ATIM: 1005 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1006 case IEEE80211_FC0_SUBTYPE_AUTH: 1007 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1008 case IEEE80211_FC0_SUBTYPE_ACTION: 1009 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1010 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1011 wh, NULL, "%s", "not handled"); 1012 vap->iv_stats.is_rx_mgtdiscard++; 1013 break; 1014 default: 1015 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1016 wh, "mgt", "subtype 0x%x not handled", subtype); 1017 vap->iv_stats.is_rx_badsubtype++; 1018 break; 1019 } 1020 } 1021 } 1022 1023 static void 1024 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1025 { 1026 1027 switch (subtype) { 1028 case IEEE80211_FC0_SUBTYPE_BAR: 1029 ieee80211_recv_bar(ni, m); 1030 break; 1031 } 1032 }
Cache object: 624e495f0b1f2e924b1fe3d9e5e17ac7
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