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_media.h> 52 #include <net/if_llc.h> 53 #include <net/ethernet.h> 54 55 #include <net/bpf.h> 56 57 #include <net80211/ieee80211_var.h> 58 #include <net80211/ieee80211_adhoc.h> 59 #include <net80211/ieee80211_input.h> 60 #ifdef IEEE80211_SUPPORT_SUPERG 61 #include <net80211/ieee80211_superg.h> 62 #endif 63 #ifdef IEEE80211_SUPPORT_TDMA 64 #include <net80211/ieee80211_tdma.h> 65 #endif 66 #include <net80211/ieee80211_sta.h> 67 68 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 69 70 static void adhoc_vattach(struct ieee80211vap *); 71 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 72 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); 73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int, int); 75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, 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 = arg; 122 123 if (ni->ni_vap == vap && 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(&ic->ic_sta, sta_leave, vap); 166 /* fall thru... */ 167 case IEEE80211_S_INIT: 168 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 169 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 170 /* 171 * Already have a channel; bypass the 172 * scan and startup immediately. 173 */ 174 ieee80211_create_ibss(vap, 175 ieee80211_ht_adjust_channel(ic, 176 vap->iv_des_chan, vap->iv_flags_ht)); 177 break; 178 } 179 /* 180 * Initiate a scan. We can come here as a result 181 * of an IEEE80211_IOC_SCAN_REQ too in which case 182 * the vap will be marked with IEEE80211_FEXT_SCANREQ 183 * and the scan request parameters will be present 184 * in iv_scanreq. Otherwise we do the default. 185 */ 186 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 187 ieee80211_check_scan(vap, 188 vap->iv_scanreq_flags, 189 vap->iv_scanreq_duration, 190 vap->iv_scanreq_mindwell, 191 vap->iv_scanreq_maxdwell, 192 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 193 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 194 } else 195 ieee80211_check_scan_current(vap); 196 break; 197 case IEEE80211_S_SCAN: 198 /* 199 * This can happen because of a change in state 200 * that requires a reset. Trigger a new scan 201 * unless we're in manual roaming mode in which 202 * case an application must issue an explicit request. 203 */ 204 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 205 ieee80211_check_scan_current(vap); 206 break; 207 default: 208 goto invalid; 209 } 210 break; 211 case IEEE80211_S_RUN: 212 if (vap->iv_flags & IEEE80211_F_WPA) { 213 /* XXX validate prerequisites */ 214 } 215 switch (ostate) { 216 case IEEE80211_S_SCAN: 217 #ifdef IEEE80211_DEBUG 218 if (ieee80211_msg_debug(vap)) { 219 ieee80211_note(vap, 220 "synchronized with %s ssid ", 221 ether_sprintf(ni->ni_bssid)); 222 ieee80211_print_essid(vap->iv_bss->ni_essid, 223 ni->ni_esslen); 224 /* XXX MCS/HT */ 225 printf(" channel %d start %uMb\n", 226 ieee80211_chan2ieee(ic, ic->ic_curchan), 227 IEEE80211_RATE2MBS(ni->ni_txrate)); 228 } 229 #endif 230 break; 231 default: 232 goto invalid; 233 } 234 /* 235 * When 802.1x is not in use mark the port authorized 236 * at this point so traffic can flow. 237 */ 238 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 239 ieee80211_node_authorize(ni); 240 /* 241 * Fake association when joining an existing bss. 242 */ 243 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 244 ic->ic_newassoc != NULL) 245 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 246 break; 247 case IEEE80211_S_SLEEP: 248 vap->iv_sta_ps(vap, 0); 249 break; 250 default: 251 invalid: 252 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 253 "%s: unexpected state transition %s -> %s\n", __func__, 254 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 255 break; 256 } 257 return 0; 258 } 259 260 /* 261 * Decide if a received management frame should be 262 * printed when debugging is enabled. This filters some 263 * of the less interesting frames that come frequently 264 * (e.g. beacons). 265 */ 266 static __inline int 267 doprint(struct ieee80211vap *vap, int subtype) 268 { 269 switch (subtype) { 270 case IEEE80211_FC0_SUBTYPE_BEACON: 271 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 272 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 273 return 1; 274 } 275 return 1; 276 } 277 278 /* 279 * Process a received frame. The node associated with the sender 280 * should be supplied. If nothing was found in the node table then 281 * the caller is assumed to supply a reference to iv_bss instead. 282 * The RSSI and a timestamp are also supplied. The RSSI data is used 283 * during AP scanning to select a AP to associate with; it can have 284 * any units so long as values have consistent units and higher values 285 * mean ``better signal''. The receive timestamp is currently not used 286 * by the 802.11 layer. 287 */ 288 static int 289 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 290 { 291 #define HAS_SEQ(type) ((type & 0x4) == 0) 292 struct ieee80211vap *vap = ni->ni_vap; 293 struct ieee80211com *ic = ni->ni_ic; 294 struct ifnet *ifp = vap->iv_ifp; 295 struct ieee80211_frame *wh; 296 struct ieee80211_key *key; 297 struct ether_header *eh; 298 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 299 uint8_t dir, type, subtype, qos; 300 uint8_t *bssid; 301 uint16_t rxseq; 302 303 if (m->m_flags & M_AMPDU_MPDU) { 304 /* 305 * Fastpath for A-MPDU reorder q resubmission. Frames 306 * w/ M_AMPDU_MPDU marked have already passed through 307 * here but were received out of order and been held on 308 * the reorder queue. When resubmitted they are marked 309 * with the M_AMPDU_MPDU flag and we can bypass most of 310 * the normal processing. 311 */ 312 wh = mtod(m, struct ieee80211_frame *); 313 type = IEEE80211_FC0_TYPE_DATA; 314 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 315 subtype = IEEE80211_FC0_SUBTYPE_QOS; 316 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 317 goto resubmit_ampdu; 318 } 319 320 KASSERT(ni != NULL, ("null node")); 321 ni->ni_inact = ni->ni_inact_reload; 322 323 type = -1; /* undefined */ 324 325 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 326 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 327 ni->ni_macaddr, NULL, 328 "too short (1): len %u", m->m_pkthdr.len); 329 vap->iv_stats.is_rx_tooshort++; 330 goto out; 331 } 332 /* 333 * Bit of a cheat here, we use a pointer for a 3-address 334 * frame format but don't reference fields past outside 335 * ieee80211_frame_min w/o first validating the data is 336 * present. 337 */ 338 wh = mtod(m, struct ieee80211_frame *); 339 340 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 341 IEEE80211_FC0_VERSION_0) { 342 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 343 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 344 wh->i_fc[0], wh->i_fc[1]); 345 vap->iv_stats.is_rx_badversion++; 346 goto err; 347 } 348 349 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 350 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 351 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 352 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 353 if (dir != IEEE80211_FC1_DIR_NODS) 354 bssid = wh->i_addr1; 355 else if (type == IEEE80211_FC0_TYPE_CTL) 356 bssid = wh->i_addr1; 357 else { 358 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 359 IEEE80211_DISCARD_MAC(vap, 360 IEEE80211_MSG_ANY, ni->ni_macaddr, 361 NULL, "too short (2): len %u", 362 m->m_pkthdr.len); 363 vap->iv_stats.is_rx_tooshort++; 364 goto out; 365 } 366 bssid = wh->i_addr3; 367 } 368 /* 369 * Validate the bssid. 370 */ 371 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 372 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 373 /* not interested in */ 374 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 375 bssid, NULL, "%s", "not to bss"); 376 vap->iv_stats.is_rx_wrongbss++; 377 goto out; 378 } 379 /* 380 * Data frame, cons up a node when it doesn't 381 * exist. This should probably done after an ACL check. 382 */ 383 if (type == IEEE80211_FC0_TYPE_DATA && 384 ni == vap->iv_bss && 385 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 386 /* 387 * Beware of frames that come in too early; we 388 * can receive broadcast frames and creating sta 389 * entries will blow up because there is no bss 390 * channel yet. 391 */ 392 if (vap->iv_state != IEEE80211_S_RUN) { 393 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 394 wh, "data", "not in RUN state (%s)", 395 ieee80211_state_name[vap->iv_state]); 396 vap->iv_stats.is_rx_badstate++; 397 goto err; 398 } 399 /* 400 * Fake up a node for this newly 401 * discovered member of the IBSS. 402 */ 403 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 404 if (ni == NULL) { 405 /* NB: stat kept for alloc failure */ 406 goto err; 407 } 408 } 409 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 410 ni->ni_noise = nf; 411 if (HAS_SEQ(type)) { 412 uint8_t tid = ieee80211_gettid(wh); 413 if (IEEE80211_QOS_HAS_SEQ(wh) && 414 TID_TO_WME_AC(tid) >= WME_AC_VI) 415 ic->ic_wme.wme_hipri_traffic++; 416 rxseq = le16toh(*(uint16_t *)wh->i_seq); 417 if (! ieee80211_check_rxseq(ni, wh)) { 418 /* duplicate, discard */ 419 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 420 bssid, "duplicate", 421 "seqno <%u,%u> fragno <%u,%u> tid %u", 422 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 423 ni->ni_rxseqs[tid] >> 424 IEEE80211_SEQ_SEQ_SHIFT, 425 rxseq & IEEE80211_SEQ_FRAG_MASK, 426 ni->ni_rxseqs[tid] & 427 IEEE80211_SEQ_FRAG_MASK, 428 tid); 429 vap->iv_stats.is_rx_dup++; 430 IEEE80211_NODE_STAT(ni, rx_dup); 431 goto out; 432 } 433 ni->ni_rxseqs[tid] = rxseq; 434 } 435 } 436 437 switch (type) { 438 case IEEE80211_FC0_TYPE_DATA: 439 hdrspace = ieee80211_hdrspace(ic, wh); 440 if (m->m_len < hdrspace && 441 (m = m_pullup(m, hdrspace)) == NULL) { 442 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 443 ni->ni_macaddr, NULL, 444 "data too short: expecting %u", hdrspace); 445 vap->iv_stats.is_rx_tooshort++; 446 goto out; /* XXX */ 447 } 448 if (dir != IEEE80211_FC1_DIR_NODS) { 449 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 450 wh, "data", "incorrect dir 0x%x", dir); 451 vap->iv_stats.is_rx_wrongdir++; 452 goto out; 453 } 454 /* XXX no power-save support */ 455 456 /* 457 * Handle A-MPDU re-ordering. If the frame is to be 458 * processed directly then ieee80211_ampdu_reorder 459 * will return 0; otherwise it has consumed the mbuf 460 * and we should do nothing more with it. 461 */ 462 if ((m->m_flags & M_AMPDU) && 463 ieee80211_ampdu_reorder(ni, m) != 0) { 464 m = NULL; 465 goto out; 466 } 467 resubmit_ampdu: 468 469 /* 470 * Handle privacy requirements. Note that we 471 * must not be preempted from here until after 472 * we (potentially) call ieee80211_crypto_demic; 473 * otherwise we may violate assumptions in the 474 * crypto cipher modules used to do delayed update 475 * of replay sequence numbers. 476 */ 477 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 478 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 479 /* 480 * Discard encrypted frames when privacy is off. 481 */ 482 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 483 wh, "WEP", "%s", "PRIVACY off"); 484 vap->iv_stats.is_rx_noprivacy++; 485 IEEE80211_NODE_STAT(ni, rx_noprivacy); 486 goto out; 487 } 488 key = ieee80211_crypto_decap(ni, m, hdrspace); 489 if (key == NULL) { 490 /* NB: stats+msgs handled in crypto_decap */ 491 IEEE80211_NODE_STAT(ni, rx_wepfail); 492 goto out; 493 } 494 wh = mtod(m, struct ieee80211_frame *); 495 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 496 } else { 497 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 498 key = NULL; 499 } 500 501 /* 502 * Save QoS bits for use below--before we strip the header. 503 */ 504 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 505 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 506 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 507 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 508 } else 509 qos = 0; 510 511 /* 512 * Next up, any fragmentation. 513 */ 514 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 515 m = ieee80211_defrag(ni, m, hdrspace); 516 if (m == NULL) { 517 /* Fragment dropped or frame not complete yet */ 518 goto out; 519 } 520 } 521 wh = NULL; /* no longer valid, catch any uses */ 522 523 /* 524 * Next strip any MSDU crypto bits. 525 */ 526 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 527 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 528 ni->ni_macaddr, "data", "%s", "demic error"); 529 vap->iv_stats.is_rx_demicfail++; 530 IEEE80211_NODE_STAT(ni, rx_demicfail); 531 goto out; 532 } 533 534 /* copy to listener after decrypt */ 535 if (ieee80211_radiotap_active_vap(vap)) 536 ieee80211_radiotap_rx(vap, m); 537 need_tap = 0; 538 539 /* 540 * Finally, strip the 802.11 header. 541 */ 542 m = ieee80211_decap(vap, m, hdrspace); 543 if (m == NULL) { 544 /* XXX mask bit to check for both */ 545 /* don't count Null data frames as errors */ 546 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 547 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 548 goto out; 549 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 550 ni->ni_macaddr, "data", "%s", "decap error"); 551 vap->iv_stats.is_rx_decap++; 552 IEEE80211_NODE_STAT(ni, rx_decap); 553 goto err; 554 } 555 eh = mtod(m, struct ether_header *); 556 if (!ieee80211_node_is_authorized(ni)) { 557 /* 558 * Deny any non-PAE frames received prior to 559 * authorization. For open/shared-key 560 * authentication the port is mark authorized 561 * after authentication completes. For 802.1x 562 * the port is not marked authorized by the 563 * authenticator until the handshake has completed. 564 */ 565 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 566 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 567 eh->ether_shost, "data", 568 "unauthorized port: ether type 0x%x len %u", 569 eh->ether_type, m->m_pkthdr.len); 570 vap->iv_stats.is_rx_unauth++; 571 IEEE80211_NODE_STAT(ni, rx_unauth); 572 goto err; 573 } 574 } else { 575 /* 576 * When denying unencrypted frames, discard 577 * any non-PAE frames received without encryption. 578 */ 579 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 580 (key == NULL && (m->m_flags & M_WEP) == 0) && 581 eh->ether_type != htons(ETHERTYPE_PAE)) { 582 /* 583 * Drop unencrypted frames. 584 */ 585 vap->iv_stats.is_rx_unencrypted++; 586 IEEE80211_NODE_STAT(ni, rx_unencrypted); 587 goto out; 588 } 589 } 590 /* XXX require HT? */ 591 if (qos & IEEE80211_QOS_AMSDU) { 592 m = ieee80211_decap_amsdu(ni, m); 593 if (m == NULL) 594 return IEEE80211_FC0_TYPE_DATA; 595 } else { 596 #ifdef IEEE80211_SUPPORT_SUPERG 597 m = ieee80211_decap_fastframe(vap, ni, m); 598 if (m == NULL) 599 return IEEE80211_FC0_TYPE_DATA; 600 #endif 601 } 602 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 603 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 604 else 605 ieee80211_deliver_data(vap, ni, m); 606 return IEEE80211_FC0_TYPE_DATA; 607 608 case IEEE80211_FC0_TYPE_MGT: 609 vap->iv_stats.is_rx_mgmt++; 610 IEEE80211_NODE_STAT(ni, rx_mgmt); 611 if (dir != IEEE80211_FC1_DIR_NODS) { 612 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 613 wh, "data", "incorrect dir 0x%x", dir); 614 vap->iv_stats.is_rx_wrongdir++; 615 goto err; 616 } 617 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 618 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 619 ni->ni_macaddr, "mgt", "too short: len %u", 620 m->m_pkthdr.len); 621 vap->iv_stats.is_rx_tooshort++; 622 goto out; 623 } 624 #ifdef IEEE80211_DEBUG 625 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 626 ieee80211_msg_dumppkts(vap)) { 627 if_printf(ifp, "received %s from %s rssi %d\n", 628 ieee80211_mgt_subtype_name[subtype >> 629 IEEE80211_FC0_SUBTYPE_SHIFT], 630 ether_sprintf(wh->i_addr2), rssi); 631 } 632 #endif 633 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 634 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 635 wh, NULL, "%s", "WEP set but not permitted"); 636 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 637 goto out; 638 } 639 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); 640 goto out; 641 642 case IEEE80211_FC0_TYPE_CTL: 643 vap->iv_stats.is_rx_ctl++; 644 IEEE80211_NODE_STAT(ni, rx_ctrl); 645 vap->iv_recv_ctl(ni, m, subtype); 646 goto out; 647 648 default: 649 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 650 wh, "bad", "frame type 0x%x", type); 651 /* should not come here */ 652 break; 653 } 654 err: 655 ifp->if_ierrors++; 656 out: 657 if (m != NULL) { 658 if (need_tap && ieee80211_radiotap_active_vap(vap)) 659 ieee80211_radiotap_rx(vap, m); 660 m_freem(m); 661 } 662 return type; 663 } 664 665 static int 666 is11bclient(const uint8_t *rates, const uint8_t *xrates) 667 { 668 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 669 int i; 670 671 /* NB: the 11b clients we care about will not have xrates */ 672 if (xrates != NULL || rates == NULL) 673 return 0; 674 for (i = 0; i < rates[1]; i++) { 675 int r = rates[2+i] & IEEE80211_RATE_VAL; 676 if (r > 2*11 || ((1<<r) & brates) == 0) 677 return 0; 678 } 679 return 1; 680 } 681 682 static void 683 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 684 int subtype, int rssi, int nf) 685 { 686 struct ieee80211vap *vap = ni->ni_vap; 687 struct ieee80211com *ic = ni->ni_ic; 688 struct ieee80211_frame *wh; 689 uint8_t *frm, *efrm, *sfrm; 690 uint8_t *ssid, *rates, *xrates; 691 #if 0 692 int ht_state_change = 0; 693 #endif 694 695 wh = mtod(m0, struct ieee80211_frame *); 696 frm = (uint8_t *)&wh[1]; 697 efrm = mtod(m0, uint8_t *) + m0->m_len; 698 switch (subtype) { 699 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 700 case IEEE80211_FC0_SUBTYPE_BEACON: { 701 struct ieee80211_scanparams scan; 702 /* 703 * We process beacon/probe response 704 * frames to discover neighbors. 705 */ 706 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 707 return; 708 /* 709 * Count frame now that we know it's to be processed. 710 */ 711 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 712 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 713 IEEE80211_NODE_STAT(ni, rx_beacons); 714 } else 715 IEEE80211_NODE_STAT(ni, rx_proberesp); 716 /* 717 * If scanning, just pass information to the scan module. 718 */ 719 if (ic->ic_flags & IEEE80211_F_SCAN) { 720 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 721 /* 722 * Actively scanning a channel marked passive; 723 * send a probe request now that we know there 724 * is 802.11 traffic present. 725 * 726 * XXX check if the beacon we recv'd gives 727 * us what we need and suppress the probe req 728 */ 729 ieee80211_probe_curchan(vap, 1); 730 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 731 } 732 ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); 733 return; 734 } 735 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 736 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 737 /* 738 * Create a new entry in the neighbor table. 739 */ 740 ni = ieee80211_add_neighbor(vap, wh, &scan); 741 } else if (ni->ni_capinfo == 0) { 742 /* 743 * Update faked node created on transmit. 744 * Note this also updates the tsf. 745 */ 746 ieee80211_init_neighbor(ni, wh, &scan); 747 } else { 748 /* 749 * Record tsf for potential resync. 750 */ 751 memcpy(ni->ni_tstamp.data, scan.tstamp, 752 sizeof(ni->ni_tstamp)); 753 } 754 /* 755 * This isn't enabled yet - otherwise it would 756 * update the HT parameters and channel width 757 * from any node, which could lead to lots of 758 * strange behaviour if the 11n nodes aren't 759 * exactly configured to match. 760 */ 761 #if 0 762 if (scan.htcap != NULL && scan.htinfo != NULL && 763 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 764 if (ieee80211_ht_updateparams(ni, 765 scan.htcap, scan.htinfo)) 766 ht_state_change = 1; 767 } 768 #endif 769 if (ni != NULL) { 770 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 771 ni->ni_noise = nf; 772 } 773 /* 774 * Same here - the channel width change should 775 * be applied to the specific peer node, not 776 * to the ic. Ie, the interface configuration 777 * should stay in its current channel width; 778 * but it should change the rate control and 779 * any queued frames for the given node only. 780 * 781 * Since there's no (current) way to inform 782 * the driver that a channel width change has 783 * occured for a single node, just stub this 784 * out. 785 */ 786 #if 0 787 if (ht_state_change) 788 ieee80211_update_chw(ic); 789 #endif 790 } 791 break; 792 } 793 794 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 795 if (vap->iv_state != IEEE80211_S_RUN) { 796 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 797 wh, NULL, "wrong state %s", 798 ieee80211_state_name[vap->iv_state]); 799 vap->iv_stats.is_rx_mgtdiscard++; 800 return; 801 } 802 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 803 /* frame must be directed */ 804 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 805 wh, NULL, "%s", "not unicast"); 806 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 807 return; 808 } 809 810 /* 811 * prreq frame format 812 * [tlv] ssid 813 * [tlv] supported rates 814 * [tlv] extended supported rates 815 */ 816 ssid = rates = xrates = NULL; 817 sfrm = frm; 818 while (efrm - frm > 1) { 819 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 820 switch (*frm) { 821 case IEEE80211_ELEMID_SSID: 822 ssid = frm; 823 break; 824 case IEEE80211_ELEMID_RATES: 825 rates = frm; 826 break; 827 case IEEE80211_ELEMID_XRATES: 828 xrates = frm; 829 break; 830 } 831 frm += frm[1] + 2; 832 } 833 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 834 if (xrates != NULL) 835 IEEE80211_VERIFY_ELEMENT(xrates, 836 IEEE80211_RATE_MAXSIZE - rates[1], return); 837 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 838 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 839 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 840 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 841 wh, NULL, 842 "%s", "no ssid with ssid suppression enabled"); 843 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 844 return; 845 } 846 847 /* XXX find a better class or define it's own */ 848 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 849 "%s", "recv probe req"); 850 /* 851 * Some legacy 11b clients cannot hack a complete 852 * probe response frame. When the request includes 853 * only a bare-bones rate set, communicate this to 854 * the transmit side. 855 */ 856 ieee80211_send_proberesp(vap, wh->i_addr2, 857 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 858 break; 859 860 case IEEE80211_FC0_SUBTYPE_ACTION: 861 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 862 if (ni == vap->iv_bss) { 863 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 864 wh, NULL, "%s", "unknown node"); 865 vap->iv_stats.is_rx_mgtdiscard++; 866 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 867 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 868 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 869 wh, NULL, "%s", "not for us"); 870 vap->iv_stats.is_rx_mgtdiscard++; 871 } else if (vap->iv_state != IEEE80211_S_RUN) { 872 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 873 wh, NULL, "wrong state %s", 874 ieee80211_state_name[vap->iv_state]); 875 vap->iv_stats.is_rx_mgtdiscard++; 876 } else { 877 if (ieee80211_parse_action(ni, m0) == 0) 878 (void)ic->ic_recv_action(ni, wh, frm, efrm); 879 } 880 break; 881 882 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 883 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 884 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 885 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 886 case IEEE80211_FC0_SUBTYPE_ATIM: 887 case IEEE80211_FC0_SUBTYPE_DISASSOC: 888 case IEEE80211_FC0_SUBTYPE_AUTH: 889 case IEEE80211_FC0_SUBTYPE_DEAUTH: 890 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 891 wh, NULL, "%s", "not handled"); 892 vap->iv_stats.is_rx_mgtdiscard++; 893 break; 894 895 default: 896 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 897 wh, "mgt", "subtype 0x%x not handled", subtype); 898 vap->iv_stats.is_rx_badsubtype++; 899 break; 900 } 901 } 902 #undef IEEE80211_VERIFY_LENGTH 903 #undef IEEE80211_VERIFY_ELEMENT 904 905 static void 906 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 907 int subtype, int rssi, int nf) 908 { 909 struct ieee80211vap *vap = ni->ni_vap; 910 struct ieee80211com *ic = ni->ni_ic; 911 struct ieee80211_frame *wh; 912 913 /* 914 * Process management frames when scanning; useful for doing 915 * a site-survey. 916 */ 917 if (ic->ic_flags & IEEE80211_F_SCAN) 918 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); 919 else { 920 wh = mtod(m0, struct ieee80211_frame *); 921 switch (subtype) { 922 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 923 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 924 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 925 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 926 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 927 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 928 case IEEE80211_FC0_SUBTYPE_BEACON: 929 case IEEE80211_FC0_SUBTYPE_ATIM: 930 case IEEE80211_FC0_SUBTYPE_DISASSOC: 931 case IEEE80211_FC0_SUBTYPE_AUTH: 932 case IEEE80211_FC0_SUBTYPE_DEAUTH: 933 case IEEE80211_FC0_SUBTYPE_ACTION: 934 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 935 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 936 wh, NULL, "%s", "not handled"); 937 vap->iv_stats.is_rx_mgtdiscard++; 938 break; 939 default: 940 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 941 wh, "mgt", "subtype 0x%x not handled", subtype); 942 vap->iv_stats.is_rx_badsubtype++; 943 break; 944 } 945 } 946 } 947 948 static void 949 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 950 { 951 952 switch (subtype) { 953 case IEEE80211_FC0_SUBTYPE_BAR: 954 ieee80211_recv_bar(ni, m); 955 break; 956 } 957 } 958