1 /*- 2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 #ifdef __FreeBSD__ 28 __FBSDID("$FreeBSD$"); 29 #endif 30 31 /* 32 * IEEE 802.11 IBSS mode support. 33 */ 34 #include "opt_inet.h" 35 #include "opt_wlan.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/malloc.h> 41 #include <sys/kernel.h> 42 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/endian.h> 46 #include <sys/errno.h> 47 #include <sys/proc.h> 48 #include <sys/sysctl.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_media.h> 53 #include <net/if_llc.h> 54 #include <net/ethernet.h> 55 56 #include <net/bpf.h> 57 58 #include <net80211/ieee80211_var.h> 59 #include <net80211/ieee80211_adhoc.h> 60 #include <net80211/ieee80211_input.h> 61 #ifdef IEEE80211_SUPPORT_SUPERG 62 #include <net80211/ieee80211_superg.h> 63 #endif 64 #ifdef IEEE80211_SUPPORT_TDMA 65 #include <net80211/ieee80211_tdma.h> 66 #endif 67 #include <net80211/ieee80211_sta.h> 68 69 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 70 71 static void adhoc_vattach(struct ieee80211vap *); 72 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 73 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 74 const struct ieee80211_rx_stats *, int, int); 75 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, const struct ieee80211_rx_stats *, int, int); 77 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 78 int subtype, const struct ieee80211_rx_stats *rxs, int, int); 79 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); 80 81 void 82 ieee80211_adhoc_attach(struct ieee80211com *ic) 83 { 84 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 85 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 86 } 87 88 void 89 ieee80211_adhoc_detach(struct ieee80211com *ic) 90 { 91 } 92 93 static void 94 adhoc_vdetach(struct ieee80211vap *vap) 95 { 96 } 97 98 static void 99 adhoc_vattach(struct ieee80211vap *vap) 100 { 101 vap->iv_newstate = adhoc_newstate; 102 vap->iv_input = adhoc_input; 103 if (vap->iv_opmode == IEEE80211_M_IBSS) 104 vap->iv_recv_mgmt = adhoc_recv_mgmt; 105 else 106 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 107 vap->iv_recv_ctl = adhoc_recv_ctl; 108 vap->iv_opdetach = adhoc_vdetach; 109 #ifdef IEEE80211_SUPPORT_TDMA 110 /* 111 * Throw control to tdma support. Note we do this 112 * after setting up our callbacks so it can piggyback 113 * on top of us. 114 */ 115 if (vap->iv_caps & IEEE80211_C_TDMA) 116 ieee80211_tdma_vattach(vap); 117 #endif 118 } 119 120 static void 121 sta_leave(void *arg, struct ieee80211_node *ni) 122 { 123 struct ieee80211vap *vap = arg; 124 125 if (ni->ni_vap == vap && ni != vap->iv_bss) 126 ieee80211_node_leave(ni); 127 } 128 129 /* 130 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 131 */ 132 static int 133 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 134 { 135 struct ieee80211com *ic = vap->iv_ic; 136 struct ieee80211_node *ni; 137 enum ieee80211_state ostate; 138 139 IEEE80211_LOCK_ASSERT(vap->iv_ic); 140 141 ostate = vap->iv_state; 142 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 143 __func__, ieee80211_state_name[ostate], 144 ieee80211_state_name[nstate], arg); 145 vap->iv_state = nstate; /* state transition */ 146 if (ostate != IEEE80211_S_SCAN) 147 ieee80211_cancel_scan(vap); /* background scan */ 148 ni = vap->iv_bss; /* NB: no reference held */ 149 switch (nstate) { 150 case IEEE80211_S_INIT: 151 switch (ostate) { 152 case IEEE80211_S_SCAN: 153 ieee80211_cancel_scan(vap); 154 break; 155 default: 156 break; 157 } 158 if (ostate != IEEE80211_S_INIT) { 159 /* NB: optimize INIT -> INIT case */ 160 ieee80211_reset_bss(vap); 161 } 162 break; 163 case IEEE80211_S_SCAN: 164 switch (ostate) { 165 case IEEE80211_S_RUN: /* beacon miss */ 166 /* purge station table; entries are stale */ 167 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 168 /* fall thru... */ 169 case IEEE80211_S_INIT: 170 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 171 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 172 /* 173 * Already have a channel; bypass the 174 * scan and startup immediately. 175 */ 176 ieee80211_create_ibss(vap, 177 ieee80211_ht_adjust_channel(ic, 178 vap->iv_des_chan, vap->iv_flags_ht)); 179 break; 180 } 181 /* 182 * Initiate a scan. We can come here as a result 183 * of an IEEE80211_IOC_SCAN_REQ too in which case 184 * the vap will be marked with IEEE80211_FEXT_SCANREQ 185 * and the scan request parameters will be present 186 * in iv_scanreq. Otherwise we do the default. 187 */ 188 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 189 ieee80211_check_scan(vap, 190 vap->iv_scanreq_flags, 191 vap->iv_scanreq_duration, 192 vap->iv_scanreq_mindwell, 193 vap->iv_scanreq_maxdwell, 194 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 195 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 196 } else 197 ieee80211_check_scan_current(vap); 198 break; 199 case IEEE80211_S_SCAN: 200 /* 201 * This can happen because of a change in state 202 * that requires a reset. Trigger a new scan 203 * unless we're in manual roaming mode in which 204 * case an application must issue an explicit request. 205 */ 206 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 207 ieee80211_check_scan_current(vap); 208 break; 209 default: 210 goto invalid; 211 } 212 break; 213 case IEEE80211_S_RUN: 214 if (vap->iv_flags & IEEE80211_F_WPA) { 215 /* XXX validate prerequisites */ 216 } 217 switch (ostate) { 218 case IEEE80211_S_INIT: 219 /* 220 * Already have a channel; bypass the 221 * scan and startup immediately. 222 * Note that ieee80211_create_ibss will call 223 * back to do a RUN->RUN state change. 224 */ 225 ieee80211_create_ibss(vap, 226 ieee80211_ht_adjust_channel(ic, 227 ic->ic_curchan, vap->iv_flags_ht)); 228 /* NB: iv_bss is changed on return */ 229 ni = vap->iv_bss; 230 break; 231 case IEEE80211_S_SCAN: 232 #ifdef IEEE80211_DEBUG 233 if (ieee80211_msg_debug(vap)) { 234 ieee80211_note(vap, 235 "synchronized with %s ssid ", 236 ether_sprintf(ni->ni_bssid)); 237 ieee80211_print_essid(vap->iv_bss->ni_essid, 238 ni->ni_esslen); 239 /* XXX MCS/HT */ 240 printf(" channel %d start %uMb\n", 241 ieee80211_chan2ieee(ic, ic->ic_curchan), 242 IEEE80211_RATE2MBS(ni->ni_txrate)); 243 } 244 #endif 245 break; 246 case IEEE80211_S_RUN: /* IBSS merge */ 247 break; 248 default: 249 goto invalid; 250 } 251 /* 252 * When 802.1x is not in use mark the port authorized 253 * at this point so traffic can flow. 254 */ 255 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 256 ieee80211_node_authorize(ni); 257 /* 258 * Fake association when joining an existing bss. 259 */ 260 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 261 ic->ic_newassoc != NULL) 262 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 263 break; 264 case IEEE80211_S_SLEEP: 265 vap->iv_sta_ps(vap, 0); 266 break; 267 default: 268 invalid: 269 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 270 "%s: unexpected state transition %s -> %s\n", __func__, 271 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 272 break; 273 } 274 return 0; 275 } 276 277 /* 278 * Decide if a received management frame should be 279 * printed when debugging is enabled. This filters some 280 * of the less interesting frames that come frequently 281 * (e.g. beacons). 282 */ 283 static __inline int 284 doprint(struct ieee80211vap *vap, int subtype) 285 { 286 switch (subtype) { 287 case IEEE80211_FC0_SUBTYPE_BEACON: 288 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 289 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 290 return 1; 291 } 292 return 1; 293 } 294 295 /* 296 * Process a received frame. The node associated with the sender 297 * should be supplied. If nothing was found in the node table then 298 * the caller is assumed to supply a reference to iv_bss instead. 299 * The RSSI and a timestamp are also supplied. The RSSI data is used 300 * during AP scanning to select a AP to associate with; it can have 301 * any units so long as values have consistent units and higher values 302 * mean ``better signal''. The receive timestamp is currently not used 303 * by the 802.11 layer. 304 */ 305 static int 306 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 307 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 308 { 309 struct ieee80211vap *vap = ni->ni_vap; 310 struct ieee80211com *ic = ni->ni_ic; 311 struct ifnet *ifp = vap->iv_ifp; 312 struct ieee80211_frame *wh; 313 struct ieee80211_key *key; 314 struct ether_header *eh; 315 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 316 uint8_t dir, type, subtype, qos; 317 uint8_t *bssid; 318 319 if (m->m_flags & M_AMPDU_MPDU) { 320 /* 321 * Fastpath for A-MPDU reorder q resubmission. Frames 322 * w/ M_AMPDU_MPDU marked have already passed through 323 * here but were received out of order and been held on 324 * the reorder queue. When resubmitted they are marked 325 * with the M_AMPDU_MPDU flag and we can bypass most of 326 * the normal processing. 327 */ 328 wh = mtod(m, struct ieee80211_frame *); 329 type = IEEE80211_FC0_TYPE_DATA; 330 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 331 subtype = IEEE80211_FC0_SUBTYPE_QOS; 332 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 333 goto resubmit_ampdu; 334 } 335 336 KASSERT(ni != NULL, ("null node")); 337 ni->ni_inact = ni->ni_inact_reload; 338 339 type = -1; /* undefined */ 340 341 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 342 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 343 ni->ni_macaddr, NULL, 344 "too short (1): len %u", m->m_pkthdr.len); 345 vap->iv_stats.is_rx_tooshort++; 346 goto out; 347 } 348 /* 349 * Bit of a cheat here, we use a pointer for a 3-address 350 * frame format but don't reference fields past outside 351 * ieee80211_frame_min w/o first validating the data is 352 * present. 353 */ 354 wh = mtod(m, struct ieee80211_frame *); 355 356 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 357 IEEE80211_FC0_VERSION_0) { 358 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 359 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 360 wh->i_fc[0], wh->i_fc[1]); 361 vap->iv_stats.is_rx_badversion++; 362 goto err; 363 } 364 365 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 366 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 367 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 368 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 369 if (dir != IEEE80211_FC1_DIR_NODS) 370 bssid = wh->i_addr1; 371 else if (type == IEEE80211_FC0_TYPE_CTL) 372 bssid = wh->i_addr1; 373 else { 374 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 375 IEEE80211_DISCARD_MAC(vap, 376 IEEE80211_MSG_ANY, ni->ni_macaddr, 377 NULL, "too short (2): len %u", 378 m->m_pkthdr.len); 379 vap->iv_stats.is_rx_tooshort++; 380 goto out; 381 } 382 bssid = wh->i_addr3; 383 } 384 /* 385 * Validate the bssid. 386 */ 387 if (!(type == IEEE80211_FC0_TYPE_MGT && 388 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 389 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 390 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 391 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 392 /* not interested in */ 393 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 394 bssid, NULL, "%s", "not to bss"); 395 vap->iv_stats.is_rx_wrongbss++; 396 goto out; 397 } 398 /* 399 * Data frame, cons up a node when it doesn't 400 * exist. This should probably done after an ACL check. 401 */ 402 if (type == IEEE80211_FC0_TYPE_DATA && 403 ni == vap->iv_bss && 404 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 405 /* 406 * Beware of frames that come in too early; we 407 * can receive broadcast frames and creating sta 408 * entries will blow up because there is no bss 409 * channel yet. 410 */ 411 if (vap->iv_state != IEEE80211_S_RUN) { 412 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 413 wh, "data", "not in RUN state (%s)", 414 ieee80211_state_name[vap->iv_state]); 415 vap->iv_stats.is_rx_badstate++; 416 goto err; 417 } 418 /* 419 * Fake up a node for this newly 420 * discovered member of the IBSS. 421 */ 422 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 423 if (ni == NULL) { 424 /* NB: stat kept for alloc failure */ 425 goto err; 426 } 427 } 428 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 429 ni->ni_noise = nf; 430 if (IEEE80211_HAS_SEQ(type, subtype) && 431 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 432 uint8_t tid = ieee80211_gettid(wh); 433 if (IEEE80211_QOS_HAS_SEQ(wh) && 434 TID_TO_WME_AC(tid) >= WME_AC_VI) 435 ic->ic_wme.wme_hipri_traffic++; 436 if (! ieee80211_check_rxseq(ni, wh, bssid)) 437 goto out; 438 } 439 } 440 441 switch (type) { 442 case IEEE80211_FC0_TYPE_DATA: 443 hdrspace = ieee80211_hdrspace(ic, wh); 444 if (m->m_len < hdrspace && 445 (m = m_pullup(m, hdrspace)) == NULL) { 446 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 447 ni->ni_macaddr, NULL, 448 "data too short: expecting %u", hdrspace); 449 vap->iv_stats.is_rx_tooshort++; 450 goto out; /* XXX */ 451 } 452 if (dir != IEEE80211_FC1_DIR_NODS) { 453 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 454 wh, "data", "incorrect dir 0x%x", dir); 455 vap->iv_stats.is_rx_wrongdir++; 456 goto out; 457 } 458 /* XXX no power-save support */ 459 460 /* 461 * Handle A-MPDU re-ordering. If the frame is to be 462 * processed directly then ieee80211_ampdu_reorder 463 * will return 0; otherwise it has consumed the mbuf 464 * and we should do nothing more with it. 465 */ 466 if ((m->m_flags & M_AMPDU) && 467 ieee80211_ampdu_reorder(ni, m) != 0) { 468 m = NULL; 469 goto out; 470 } 471 resubmit_ampdu: 472 473 /* 474 * Handle privacy requirements. Note that we 475 * must not be preempted from here until after 476 * we (potentially) call ieee80211_crypto_demic; 477 * otherwise we may violate assumptions in the 478 * crypto cipher modules used to do delayed update 479 * of replay sequence numbers. 480 */ 481 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 482 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 483 /* 484 * Discard encrypted frames when privacy is off. 485 */ 486 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 487 wh, "WEP", "%s", "PRIVACY off"); 488 vap->iv_stats.is_rx_noprivacy++; 489 IEEE80211_NODE_STAT(ni, rx_noprivacy); 490 goto out; 491 } 492 key = ieee80211_crypto_decap(ni, m, hdrspace); 493 if (key == NULL) { 494 /* NB: stats+msgs handled in crypto_decap */ 495 IEEE80211_NODE_STAT(ni, rx_wepfail); 496 goto out; 497 } 498 wh = mtod(m, struct ieee80211_frame *); 499 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 500 } else { 501 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 502 key = NULL; 503 } 504 505 /* 506 * Save QoS bits for use below--before we strip the header. 507 */ 508 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 509 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 510 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 511 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 512 } else 513 qos = 0; 514 515 /* 516 * Next up, any fragmentation. 517 */ 518 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 519 m = ieee80211_defrag(ni, m, hdrspace); 520 if (m == NULL) { 521 /* Fragment dropped or frame not complete yet */ 522 goto out; 523 } 524 } 525 wh = NULL; /* no longer valid, catch any uses */ 526 527 /* 528 * Next strip any MSDU crypto bits. 529 */ 530 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 531 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 532 ni->ni_macaddr, "data", "%s", "demic error"); 533 vap->iv_stats.is_rx_demicfail++; 534 IEEE80211_NODE_STAT(ni, rx_demicfail); 535 goto out; 536 } 537 538 /* copy to listener after decrypt */ 539 if (ieee80211_radiotap_active_vap(vap)) 540 ieee80211_radiotap_rx(vap, m); 541 need_tap = 0; 542 543 /* 544 * Finally, strip the 802.11 header. 545 */ 546 m = ieee80211_decap(vap, m, hdrspace); 547 if (m == NULL) { 548 /* XXX mask bit to check for both */ 549 /* don't count Null data frames as errors */ 550 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 551 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 552 goto out; 553 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 554 ni->ni_macaddr, "data", "%s", "decap error"); 555 vap->iv_stats.is_rx_decap++; 556 IEEE80211_NODE_STAT(ni, rx_decap); 557 goto err; 558 } 559 eh = mtod(m, struct ether_header *); 560 if (!ieee80211_node_is_authorized(ni)) { 561 /* 562 * Deny any non-PAE frames received prior to 563 * authorization. For open/shared-key 564 * authentication the port is mark authorized 565 * after authentication completes. For 802.1x 566 * the port is not marked authorized by the 567 * authenticator until the handshake has completed. 568 */ 569 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 570 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 571 eh->ether_shost, "data", 572 "unauthorized port: ether type 0x%x len %u", 573 eh->ether_type, m->m_pkthdr.len); 574 vap->iv_stats.is_rx_unauth++; 575 IEEE80211_NODE_STAT(ni, rx_unauth); 576 goto err; 577 } 578 } else { 579 /* 580 * When denying unencrypted frames, discard 581 * any non-PAE frames received without encryption. 582 */ 583 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 584 (key == NULL && (m->m_flags & M_WEP) == 0) && 585 eh->ether_type != htons(ETHERTYPE_PAE)) { 586 /* 587 * Drop unencrypted frames. 588 */ 589 vap->iv_stats.is_rx_unencrypted++; 590 IEEE80211_NODE_STAT(ni, rx_unencrypted); 591 goto out; 592 } 593 } 594 /* XXX require HT? */ 595 if (qos & IEEE80211_QOS_AMSDU) { 596 m = ieee80211_decap_amsdu(ni, m); 597 if (m == NULL) 598 return IEEE80211_FC0_TYPE_DATA; 599 } else { 600 #ifdef IEEE80211_SUPPORT_SUPERG 601 m = ieee80211_decap_fastframe(vap, ni, m); 602 if (m == NULL) 603 return IEEE80211_FC0_TYPE_DATA; 604 #endif 605 } 606 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 607 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 608 else 609 ieee80211_deliver_data(vap, ni, m); 610 return IEEE80211_FC0_TYPE_DATA; 611 612 case IEEE80211_FC0_TYPE_MGT: 613 vap->iv_stats.is_rx_mgmt++; 614 IEEE80211_NODE_STAT(ni, rx_mgmt); 615 if (dir != IEEE80211_FC1_DIR_NODS) { 616 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 617 wh, "data", "incorrect dir 0x%x", dir); 618 vap->iv_stats.is_rx_wrongdir++; 619 goto err; 620 } 621 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 622 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 623 ni->ni_macaddr, "mgt", "too short: len %u", 624 m->m_pkthdr.len); 625 vap->iv_stats.is_rx_tooshort++; 626 goto out; 627 } 628 #ifdef IEEE80211_DEBUG 629 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 630 ieee80211_msg_dumppkts(vap)) { 631 if_printf(ifp, "received %s from %s rssi %d\n", 632 ieee80211_mgt_subtype_name(subtype), 633 ether_sprintf(wh->i_addr2), rssi); 634 } 635 #endif 636 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 637 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 638 wh, NULL, "%s", "WEP set but not permitted"); 639 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 640 goto out; 641 } 642 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 643 goto out; 644 645 case IEEE80211_FC0_TYPE_CTL: 646 vap->iv_stats.is_rx_ctl++; 647 IEEE80211_NODE_STAT(ni, rx_ctrl); 648 vap->iv_recv_ctl(ni, m, subtype); 649 goto out; 650 651 default: 652 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 653 wh, "bad", "frame type 0x%x", type); 654 /* should not come here */ 655 break; 656 } 657 err: 658 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 659 out: 660 if (m != NULL) { 661 if (need_tap && ieee80211_radiotap_active_vap(vap)) 662 ieee80211_radiotap_rx(vap, m); 663 m_freem(m); 664 } 665 return type; 666 } 667 668 static int 669 is11bclient(const uint8_t *rates, const uint8_t *xrates) 670 { 671 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 672 int i; 673 674 /* NB: the 11b clients we care about will not have xrates */ 675 if (xrates != NULL || rates == NULL) 676 return 0; 677 for (i = 0; i < rates[1]; i++) { 678 int r = rates[2+i] & IEEE80211_RATE_VAL; 679 if (r > 2*11 || ((1<<r) & brates) == 0) 680 return 0; 681 } 682 return 1; 683 } 684 685 static void 686 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 687 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 688 { 689 struct ieee80211vap *vap = ni->ni_vap; 690 struct ieee80211com *ic = ni->ni_ic; 691 struct ieee80211_channel *rxchan = ic->ic_curchan; 692 struct ieee80211_frame *wh; 693 uint8_t *frm, *efrm; 694 uint8_t *ssid, *rates, *xrates; 695 #if 0 696 int ht_state_change = 0; 697 #endif 698 699 wh = mtod(m0, struct ieee80211_frame *); 700 frm = (uint8_t *)&wh[1]; 701 efrm = mtod(m0, uint8_t *) + m0->m_len; 702 switch (subtype) { 703 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 704 case IEEE80211_FC0_SUBTYPE_BEACON: { 705 struct ieee80211_scanparams scan; 706 struct ieee80211_channel *c; 707 /* 708 * We process beacon/probe response 709 * frames to discover neighbors. 710 */ 711 if (rxs != NULL) { 712 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 713 if (c != NULL) 714 rxchan = c; 715 } 716 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 717 return; 718 /* 719 * Count frame now that we know it's to be processed. 720 */ 721 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 722 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 723 IEEE80211_NODE_STAT(ni, rx_beacons); 724 } else 725 IEEE80211_NODE_STAT(ni, rx_proberesp); 726 /* 727 * If scanning, just pass information to the scan module. 728 */ 729 if (ic->ic_flags & IEEE80211_F_SCAN) { 730 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 731 /* 732 * Actively scanning a channel marked passive; 733 * send a probe request now that we know there 734 * is 802.11 traffic present. 735 * 736 * XXX check if the beacon we recv'd gives 737 * us what we need and suppress the probe req 738 */ 739 ieee80211_probe_curchan(vap, 1); 740 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 741 } 742 ieee80211_add_scan(vap, rxchan, &scan, wh, 743 subtype, rssi, nf); 744 return; 745 } 746 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 747 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 748 /* 749 * Create a new entry in the neighbor table. 750 * 751 * XXX TODO: 752 * 753 * Here we're not scanning; so if we have an 754 * SSID then make sure it matches our SSID. 755 * Otherwise this code will match on all IBSS 756 * beacons/probe requests for all SSIDs, 757 * filling the node table with nodes that 758 * aren't ours. 759 */ 760 if (ieee80211_ibss_node_check_new(ni, &scan)) 761 ni = ieee80211_add_neighbor(vap, wh, &scan); 762 else 763 ni = NULL; 764 } else if (ni->ni_capinfo == 0) { 765 /* 766 * Update faked node created on transmit. 767 * Note this also updates the tsf. 768 */ 769 ieee80211_init_neighbor(ni, wh, &scan); 770 } else { 771 /* 772 * Record tsf for potential resync. 773 */ 774 memcpy(ni->ni_tstamp.data, scan.tstamp, 775 sizeof(ni->ni_tstamp)); 776 } 777 /* 778 * This isn't enabled yet - otherwise it would 779 * update the HT parameters and channel width 780 * from any node, which could lead to lots of 781 * strange behaviour if the 11n nodes aren't 782 * exactly configured to match. 783 */ 784 #if 0 785 if (scan.htcap != NULL && scan.htinfo != NULL && 786 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 787 if (ieee80211_ht_updateparams(ni, 788 scan.htcap, scan.htinfo)) 789 ht_state_change = 1; 790 } 791 #endif 792 if (ni != NULL) { 793 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 794 ni->ni_noise = nf; 795 } 796 /* 797 * Same here - the channel width change should 798 * be applied to the specific peer node, not 799 * to the ic. Ie, the interface configuration 800 * should stay in its current channel width; 801 * but it should change the rate control and 802 * any queued frames for the given node only. 803 * 804 * Since there's no (current) way to inform 805 * the driver that a channel width change has 806 * occurred for a single node, just stub this 807 * out. 808 */ 809 #if 0 810 if (ht_state_change) 811 ieee80211_update_chw(ic); 812 #endif 813 } 814 break; 815 } 816 817 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 818 if (vap->iv_state != IEEE80211_S_RUN) { 819 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 820 wh, NULL, "wrong state %s", 821 ieee80211_state_name[vap->iv_state]); 822 vap->iv_stats.is_rx_mgtdiscard++; 823 return; 824 } 825 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 826 /* frame must be directed */ 827 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 828 wh, NULL, "%s", "not unicast"); 829 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 830 return; 831 } 832 833 /* 834 * prreq frame format 835 * [tlv] ssid 836 * [tlv] supported rates 837 * [tlv] extended supported rates 838 */ 839 ssid = rates = xrates = NULL; 840 while (efrm - frm > 1) { 841 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 842 switch (*frm) { 843 case IEEE80211_ELEMID_SSID: 844 ssid = frm; 845 break; 846 case IEEE80211_ELEMID_RATES: 847 rates = frm; 848 break; 849 case IEEE80211_ELEMID_XRATES: 850 xrates = frm; 851 break; 852 } 853 frm += frm[1] + 2; 854 } 855 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 856 if (xrates != NULL) 857 IEEE80211_VERIFY_ELEMENT(xrates, 858 IEEE80211_RATE_MAXSIZE - rates[1], return); 859 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 860 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 861 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 862 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 863 wh, NULL, 864 "%s", "no ssid with ssid suppression enabled"); 865 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 866 return; 867 } 868 869 /* XXX find a better class or define it's own */ 870 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 871 "%s", "recv probe req"); 872 /* 873 * Some legacy 11b clients cannot hack a complete 874 * probe response frame. When the request includes 875 * only a bare-bones rate set, communicate this to 876 * the transmit side. 877 */ 878 ieee80211_send_proberesp(vap, wh->i_addr2, 879 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 880 break; 881 882 case IEEE80211_FC0_SUBTYPE_ACTION: 883 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 884 if ((ni == vap->iv_bss) && 885 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 886 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 887 wh, NULL, "%s", "unknown node"); 888 vap->iv_stats.is_rx_mgtdiscard++; 889 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 890 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 891 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 892 wh, NULL, "%s", "not for us"); 893 vap->iv_stats.is_rx_mgtdiscard++; 894 } else if (vap->iv_state != IEEE80211_S_RUN) { 895 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 896 wh, NULL, "wrong state %s", 897 ieee80211_state_name[vap->iv_state]); 898 vap->iv_stats.is_rx_mgtdiscard++; 899 } else { 900 if (ieee80211_parse_action(ni, m0) == 0) 901 (void)ic->ic_recv_action(ni, wh, frm, efrm); 902 } 903 break; 904 905 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 906 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 907 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 908 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 909 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 910 case IEEE80211_FC0_SUBTYPE_ATIM: 911 case IEEE80211_FC0_SUBTYPE_DISASSOC: 912 case IEEE80211_FC0_SUBTYPE_AUTH: 913 case IEEE80211_FC0_SUBTYPE_DEAUTH: 914 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 915 wh, NULL, "%s", "not handled"); 916 vap->iv_stats.is_rx_mgtdiscard++; 917 break; 918 919 default: 920 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 921 wh, "mgt", "subtype 0x%x not handled", subtype); 922 vap->iv_stats.is_rx_badsubtype++; 923 break; 924 } 925 } 926 #undef IEEE80211_VERIFY_LENGTH 927 #undef IEEE80211_VERIFY_ELEMENT 928 929 static void 930 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 931 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 932 { 933 struct ieee80211vap *vap = ni->ni_vap; 934 struct ieee80211com *ic = ni->ni_ic; 935 struct ieee80211_frame *wh; 936 937 /* 938 * Process management frames when scanning; useful for doing 939 * a site-survey. 940 */ 941 if (ic->ic_flags & IEEE80211_F_SCAN) 942 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 943 else { 944 wh = mtod(m0, struct ieee80211_frame *); 945 switch (subtype) { 946 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 947 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 948 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 949 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 950 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 951 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 952 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 953 case IEEE80211_FC0_SUBTYPE_BEACON: 954 case IEEE80211_FC0_SUBTYPE_ATIM: 955 case IEEE80211_FC0_SUBTYPE_DISASSOC: 956 case IEEE80211_FC0_SUBTYPE_AUTH: 957 case IEEE80211_FC0_SUBTYPE_DEAUTH: 958 case IEEE80211_FC0_SUBTYPE_ACTION: 959 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 960 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 961 wh, NULL, "%s", "not handled"); 962 vap->iv_stats.is_rx_mgtdiscard++; 963 break; 964 default: 965 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 966 wh, "mgt", "subtype 0x%x not handled", subtype); 967 vap->iv_stats.is_rx_badsubtype++; 968 break; 969 } 970 } 971 } 972 973 static void 974 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 975 { 976 977 switch (subtype) { 978 case IEEE80211_FC0_SUBTYPE_BAR: 979 ieee80211_recv_bar(ni, m); 980 break; 981 } 982 } 983