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_SCAN: 219 #ifdef IEEE80211_DEBUG 220 if (ieee80211_msg_debug(vap)) { 221 ieee80211_note(vap, 222 "synchronized with %s ssid ", 223 ether_sprintf(ni->ni_bssid)); 224 ieee80211_print_essid(vap->iv_bss->ni_essid, 225 ni->ni_esslen); 226 /* XXX MCS/HT */ 227 printf(" channel %d start %uMb\n", 228 ieee80211_chan2ieee(ic, ic->ic_curchan), 229 IEEE80211_RATE2MBS(ni->ni_txrate)); 230 } 231 #endif 232 break; 233 case IEEE80211_S_RUN: /* IBSS merge */ 234 break; 235 default: 236 goto invalid; 237 } 238 /* 239 * When 802.1x is not in use mark the port authorized 240 * at this point so traffic can flow. 241 */ 242 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 243 ieee80211_node_authorize(ni); 244 /* 245 * Fake association when joining an existing bss. 246 */ 247 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 248 ic->ic_newassoc != NULL) 249 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 250 break; 251 case IEEE80211_S_SLEEP: 252 vap->iv_sta_ps(vap, 0); 253 break; 254 default: 255 invalid: 256 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 257 "%s: unexpected state transition %s -> %s\n", __func__, 258 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 259 break; 260 } 261 return 0; 262 } 263 264 /* 265 * Decide if a received management frame should be 266 * printed when debugging is enabled. This filters some 267 * of the less interesting frames that come frequently 268 * (e.g. beacons). 269 */ 270 static __inline int 271 doprint(struct ieee80211vap *vap, int subtype) 272 { 273 switch (subtype) { 274 case IEEE80211_FC0_SUBTYPE_BEACON: 275 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 276 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 277 return 1; 278 } 279 return 1; 280 } 281 282 /* 283 * Process a received frame. The node associated with the sender 284 * should be supplied. If nothing was found in the node table then 285 * the caller is assumed to supply a reference to iv_bss instead. 286 * The RSSI and a timestamp are also supplied. The RSSI data is used 287 * during AP scanning to select a AP to associate with; it can have 288 * any units so long as values have consistent units and higher values 289 * mean ``better signal''. The receive timestamp is currently not used 290 * by the 802.11 layer. 291 */ 292 static int 293 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 294 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 295 { 296 struct ieee80211vap *vap = ni->ni_vap; 297 struct ieee80211com *ic = ni->ni_ic; 298 struct ifnet *ifp = vap->iv_ifp; 299 struct ieee80211_frame *wh; 300 struct ieee80211_key *key; 301 struct ether_header *eh; 302 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 303 uint8_t dir, type, subtype, qos; 304 uint8_t *bssid; 305 uint16_t rxseq; 306 307 if (m->m_flags & M_AMPDU_MPDU) { 308 /* 309 * Fastpath for A-MPDU reorder q resubmission. Frames 310 * w/ M_AMPDU_MPDU marked have already passed through 311 * here but were received out of order and been held on 312 * the reorder queue. When resubmitted they are marked 313 * with the M_AMPDU_MPDU flag and we can bypass most of 314 * the normal processing. 315 */ 316 wh = mtod(m, struct ieee80211_frame *); 317 type = IEEE80211_FC0_TYPE_DATA; 318 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 319 subtype = IEEE80211_FC0_SUBTYPE_QOS; 320 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 321 goto resubmit_ampdu; 322 } 323 324 KASSERT(ni != NULL, ("null node")); 325 ni->ni_inact = ni->ni_inact_reload; 326 327 type = -1; /* undefined */ 328 329 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 330 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 331 ni->ni_macaddr, NULL, 332 "too short (1): len %u", m->m_pkthdr.len); 333 vap->iv_stats.is_rx_tooshort++; 334 goto out; 335 } 336 /* 337 * Bit of a cheat here, we use a pointer for a 3-address 338 * frame format but don't reference fields past outside 339 * ieee80211_frame_min w/o first validating the data is 340 * present. 341 */ 342 wh = mtod(m, struct ieee80211_frame *); 343 344 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 345 IEEE80211_FC0_VERSION_0) { 346 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 347 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 348 wh->i_fc[0], wh->i_fc[1]); 349 vap->iv_stats.is_rx_badversion++; 350 goto err; 351 } 352 353 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 354 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 355 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 356 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 357 if (dir != IEEE80211_FC1_DIR_NODS) 358 bssid = wh->i_addr1; 359 else if (type == IEEE80211_FC0_TYPE_CTL) 360 bssid = wh->i_addr1; 361 else { 362 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 363 IEEE80211_DISCARD_MAC(vap, 364 IEEE80211_MSG_ANY, ni->ni_macaddr, 365 NULL, "too short (2): len %u", 366 m->m_pkthdr.len); 367 vap->iv_stats.is_rx_tooshort++; 368 goto out; 369 } 370 bssid = wh->i_addr3; 371 } 372 /* 373 * Validate the bssid. 374 */ 375 if (!(type == IEEE80211_FC0_TYPE_MGT && 376 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 377 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 378 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 379 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 380 /* not interested in */ 381 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 382 bssid, NULL, "%s", "not to bss"); 383 vap->iv_stats.is_rx_wrongbss++; 384 goto out; 385 } 386 /* 387 * Data frame, cons up a node when it doesn't 388 * exist. This should probably done after an ACL check. 389 */ 390 if (type == IEEE80211_FC0_TYPE_DATA && 391 ni == vap->iv_bss && 392 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 393 /* 394 * Beware of frames that come in too early; we 395 * can receive broadcast frames and creating sta 396 * entries will blow up because there is no bss 397 * channel yet. 398 */ 399 if (vap->iv_state != IEEE80211_S_RUN) { 400 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 401 wh, "data", "not in RUN state (%s)", 402 ieee80211_state_name[vap->iv_state]); 403 vap->iv_stats.is_rx_badstate++; 404 goto err; 405 } 406 /* 407 * Fake up a node for this newly 408 * discovered member of the IBSS. 409 */ 410 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 411 if (ni == NULL) { 412 /* NB: stat kept for alloc failure */ 413 goto err; 414 } 415 } 416 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 417 ni->ni_noise = nf; 418 if (IEEE80211_HAS_SEQ(type, subtype) && 419 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 420 uint8_t tid = ieee80211_gettid(wh); 421 if (IEEE80211_QOS_HAS_SEQ(wh) && 422 TID_TO_WME_AC(tid) >= WME_AC_VI) 423 ic->ic_wme.wme_hipri_traffic++; 424 rxseq = le16toh(*(uint16_t *)wh->i_seq); 425 if (! ieee80211_check_rxseq(ni, wh)) { 426 /* duplicate, discard */ 427 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 428 bssid, "duplicate", 429 "seqno <%u,%u> fragno <%u,%u> tid %u", 430 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 431 ni->ni_rxseqs[tid] >> 432 IEEE80211_SEQ_SEQ_SHIFT, 433 rxseq & IEEE80211_SEQ_FRAG_MASK, 434 ni->ni_rxseqs[tid] & 435 IEEE80211_SEQ_FRAG_MASK, 436 tid); 437 vap->iv_stats.is_rx_dup++; 438 IEEE80211_NODE_STAT(ni, rx_dup); 439 goto out; 440 } 441 ni->ni_rxseqs[tid] = rxseq; 442 } 443 } 444 445 switch (type) { 446 case IEEE80211_FC0_TYPE_DATA: 447 hdrspace = ieee80211_hdrspace(ic, wh); 448 if (m->m_len < hdrspace && 449 (m = m_pullup(m, hdrspace)) == NULL) { 450 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 451 ni->ni_macaddr, NULL, 452 "data too short: expecting %u", hdrspace); 453 vap->iv_stats.is_rx_tooshort++; 454 goto out; /* XXX */ 455 } 456 if (dir != IEEE80211_FC1_DIR_NODS) { 457 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 458 wh, "data", "incorrect dir 0x%x", dir); 459 vap->iv_stats.is_rx_wrongdir++; 460 goto out; 461 } 462 /* XXX no power-save support */ 463 464 /* 465 * Handle A-MPDU re-ordering. If the frame is to be 466 * processed directly then ieee80211_ampdu_reorder 467 * will return 0; otherwise it has consumed the mbuf 468 * and we should do nothing more with it. 469 */ 470 if ((m->m_flags & M_AMPDU) && 471 ieee80211_ampdu_reorder(ni, m) != 0) { 472 m = NULL; 473 goto out; 474 } 475 resubmit_ampdu: 476 477 /* 478 * Handle privacy requirements. Note that we 479 * must not be preempted from here until after 480 * we (potentially) call ieee80211_crypto_demic; 481 * otherwise we may violate assumptions in the 482 * crypto cipher modules used to do delayed update 483 * of replay sequence numbers. 484 */ 485 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 486 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 487 /* 488 * Discard encrypted frames when privacy is off. 489 */ 490 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 491 wh, "WEP", "%s", "PRIVACY off"); 492 vap->iv_stats.is_rx_noprivacy++; 493 IEEE80211_NODE_STAT(ni, rx_noprivacy); 494 goto out; 495 } 496 key = ieee80211_crypto_decap(ni, m, hdrspace); 497 if (key == NULL) { 498 /* NB: stats+msgs handled in crypto_decap */ 499 IEEE80211_NODE_STAT(ni, rx_wepfail); 500 goto out; 501 } 502 wh = mtod(m, struct ieee80211_frame *); 503 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 504 } else { 505 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 506 key = NULL; 507 } 508 509 /* 510 * Save QoS bits for use below--before we strip the header. 511 */ 512 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 513 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 514 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 515 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 516 } else 517 qos = 0; 518 519 /* 520 * Next up, any fragmentation. 521 */ 522 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 523 m = ieee80211_defrag(ni, m, hdrspace); 524 if (m == NULL) { 525 /* Fragment dropped or frame not complete yet */ 526 goto out; 527 } 528 } 529 wh = NULL; /* no longer valid, catch any uses */ 530 531 /* 532 * Next strip any MSDU crypto bits. 533 */ 534 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 535 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 536 ni->ni_macaddr, "data", "%s", "demic error"); 537 vap->iv_stats.is_rx_demicfail++; 538 IEEE80211_NODE_STAT(ni, rx_demicfail); 539 goto out; 540 } 541 542 /* copy to listener after decrypt */ 543 if (ieee80211_radiotap_active_vap(vap)) 544 ieee80211_radiotap_rx(vap, m); 545 need_tap = 0; 546 547 /* 548 * Finally, strip the 802.11 header. 549 */ 550 m = ieee80211_decap(vap, m, hdrspace); 551 if (m == NULL) { 552 /* XXX mask bit to check for both */ 553 /* don't count Null data frames as errors */ 554 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 555 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 556 goto out; 557 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 558 ni->ni_macaddr, "data", "%s", "decap error"); 559 vap->iv_stats.is_rx_decap++; 560 IEEE80211_NODE_STAT(ni, rx_decap); 561 goto err; 562 } 563 eh = mtod(m, struct ether_header *); 564 if (!ieee80211_node_is_authorized(ni)) { 565 /* 566 * Deny any non-PAE frames received prior to 567 * authorization. For open/shared-key 568 * authentication the port is mark authorized 569 * after authentication completes. For 802.1x 570 * the port is not marked authorized by the 571 * authenticator until the handshake has completed. 572 */ 573 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 574 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 575 eh->ether_shost, "data", 576 "unauthorized port: ether type 0x%x len %u", 577 eh->ether_type, m->m_pkthdr.len); 578 vap->iv_stats.is_rx_unauth++; 579 IEEE80211_NODE_STAT(ni, rx_unauth); 580 goto err; 581 } 582 } else { 583 /* 584 * When denying unencrypted frames, discard 585 * any non-PAE frames received without encryption. 586 */ 587 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 588 (key == NULL && (m->m_flags & M_WEP) == 0) && 589 eh->ether_type != htons(ETHERTYPE_PAE)) { 590 /* 591 * Drop unencrypted frames. 592 */ 593 vap->iv_stats.is_rx_unencrypted++; 594 IEEE80211_NODE_STAT(ni, rx_unencrypted); 595 goto out; 596 } 597 } 598 /* XXX require HT? */ 599 if (qos & IEEE80211_QOS_AMSDU) { 600 m = ieee80211_decap_amsdu(ni, m); 601 if (m == NULL) 602 return IEEE80211_FC0_TYPE_DATA; 603 } else { 604 #ifdef IEEE80211_SUPPORT_SUPERG 605 m = ieee80211_decap_fastframe(vap, ni, m); 606 if (m == NULL) 607 return IEEE80211_FC0_TYPE_DATA; 608 #endif 609 } 610 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 611 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 612 else 613 ieee80211_deliver_data(vap, ni, m); 614 return IEEE80211_FC0_TYPE_DATA; 615 616 case IEEE80211_FC0_TYPE_MGT: 617 vap->iv_stats.is_rx_mgmt++; 618 IEEE80211_NODE_STAT(ni, rx_mgmt); 619 if (dir != IEEE80211_FC1_DIR_NODS) { 620 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 621 wh, "data", "incorrect dir 0x%x", dir); 622 vap->iv_stats.is_rx_wrongdir++; 623 goto err; 624 } 625 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 626 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 627 ni->ni_macaddr, "mgt", "too short: len %u", 628 m->m_pkthdr.len); 629 vap->iv_stats.is_rx_tooshort++; 630 goto out; 631 } 632 #ifdef IEEE80211_DEBUG 633 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 634 ieee80211_msg_dumppkts(vap)) { 635 if_printf(ifp, "received %s from %s rssi %d\n", 636 ieee80211_mgt_subtype_name[subtype >> 637 IEEE80211_FC0_SUBTYPE_SHIFT], 638 ether_sprintf(wh->i_addr2), rssi); 639 } 640 #endif 641 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 642 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 643 wh, NULL, "%s", "WEP set but not permitted"); 644 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 645 goto out; 646 } 647 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 648 goto out; 649 650 case IEEE80211_FC0_TYPE_CTL: 651 vap->iv_stats.is_rx_ctl++; 652 IEEE80211_NODE_STAT(ni, rx_ctrl); 653 vap->iv_recv_ctl(ni, m, subtype); 654 goto out; 655 656 default: 657 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 658 wh, "bad", "frame type 0x%x", type); 659 /* should not come here */ 660 break; 661 } 662 err: 663 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 664 out: 665 if (m != NULL) { 666 if (need_tap && ieee80211_radiotap_active_vap(vap)) 667 ieee80211_radiotap_rx(vap, m); 668 m_freem(m); 669 } 670 return type; 671 } 672 673 static int 674 is11bclient(const uint8_t *rates, const uint8_t *xrates) 675 { 676 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 677 int i; 678 679 /* NB: the 11b clients we care about will not have xrates */ 680 if (xrates != NULL || rates == NULL) 681 return 0; 682 for (i = 0; i < rates[1]; i++) { 683 int r = rates[2+i] & IEEE80211_RATE_VAL; 684 if (r > 2*11 || ((1<<r) & brates) == 0) 685 return 0; 686 } 687 return 1; 688 } 689 690 static void 691 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 692 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 693 { 694 struct ieee80211vap *vap = ni->ni_vap; 695 struct ieee80211com *ic = ni->ni_ic; 696 struct ieee80211_channel *rxchan = ic->ic_curchan; 697 struct ieee80211_frame *wh; 698 uint8_t *frm, *efrm, *sfrm; 699 uint8_t *ssid, *rates, *xrates; 700 #if 0 701 int ht_state_change = 0; 702 #endif 703 704 wh = mtod(m0, struct ieee80211_frame *); 705 frm = (uint8_t *)&wh[1]; 706 efrm = mtod(m0, uint8_t *) + m0->m_len; 707 switch (subtype) { 708 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 709 case IEEE80211_FC0_SUBTYPE_BEACON: { 710 struct ieee80211_scanparams scan; 711 struct ieee80211_channel *c; 712 /* 713 * We process beacon/probe response 714 * frames to discover neighbors. 715 */ 716 if (rxs != NULL) { 717 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 718 if (c != NULL) 719 rxchan = c; 720 } 721 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 722 return; 723 /* 724 * Count frame now that we know it's to be processed. 725 */ 726 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 727 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 728 IEEE80211_NODE_STAT(ni, rx_beacons); 729 } else 730 IEEE80211_NODE_STAT(ni, rx_proberesp); 731 /* 732 * If scanning, just pass information to the scan module. 733 */ 734 if (ic->ic_flags & IEEE80211_F_SCAN) { 735 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 736 /* 737 * Actively scanning a channel marked passive; 738 * send a probe request now that we know there 739 * is 802.11 traffic present. 740 * 741 * XXX check if the beacon we recv'd gives 742 * us what we need and suppress the probe req 743 */ 744 ieee80211_probe_curchan(vap, 1); 745 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 746 } 747 ieee80211_add_scan(vap, rxchan, &scan, wh, 748 subtype, rssi, nf); 749 return; 750 } 751 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 752 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 753 /* 754 * Create a new entry in the neighbor table. 755 */ 756 ni = ieee80211_add_neighbor(vap, wh, &scan); 757 } else if (ni->ni_capinfo == 0) { 758 /* 759 * Update faked node created on transmit. 760 * Note this also updates the tsf. 761 */ 762 ieee80211_init_neighbor(ni, wh, &scan); 763 } else { 764 /* 765 * Record tsf for potential resync. 766 */ 767 memcpy(ni->ni_tstamp.data, scan.tstamp, 768 sizeof(ni->ni_tstamp)); 769 } 770 /* 771 * This isn't enabled yet - otherwise it would 772 * update the HT parameters and channel width 773 * from any node, which could lead to lots of 774 * strange behaviour if the 11n nodes aren't 775 * exactly configured to match. 776 */ 777 #if 0 778 if (scan.htcap != NULL && scan.htinfo != NULL && 779 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 780 if (ieee80211_ht_updateparams(ni, 781 scan.htcap, scan.htinfo)) 782 ht_state_change = 1; 783 } 784 #endif 785 if (ni != NULL) { 786 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 787 ni->ni_noise = nf; 788 } 789 /* 790 * Same here - the channel width change should 791 * be applied to the specific peer node, not 792 * to the ic. Ie, the interface configuration 793 * should stay in its current channel width; 794 * but it should change the rate control and 795 * any queued frames for the given node only. 796 * 797 * Since there's no (current) way to inform 798 * the driver that a channel width change has 799 * occured for a single node, just stub this 800 * out. 801 */ 802 #if 0 803 if (ht_state_change) 804 ieee80211_update_chw(ic); 805 #endif 806 } 807 break; 808 } 809 810 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 811 if (vap->iv_state != IEEE80211_S_RUN) { 812 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 813 wh, NULL, "wrong state %s", 814 ieee80211_state_name[vap->iv_state]); 815 vap->iv_stats.is_rx_mgtdiscard++; 816 return; 817 } 818 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 819 /* frame must be directed */ 820 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 821 wh, NULL, "%s", "not unicast"); 822 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 823 return; 824 } 825 826 /* 827 * prreq frame format 828 * [tlv] ssid 829 * [tlv] supported rates 830 * [tlv] extended supported rates 831 */ 832 ssid = rates = xrates = NULL; 833 sfrm = frm; 834 while (efrm - frm > 1) { 835 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 836 switch (*frm) { 837 case IEEE80211_ELEMID_SSID: 838 ssid = frm; 839 break; 840 case IEEE80211_ELEMID_RATES: 841 rates = frm; 842 break; 843 case IEEE80211_ELEMID_XRATES: 844 xrates = frm; 845 break; 846 } 847 frm += frm[1] + 2; 848 } 849 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 850 if (xrates != NULL) 851 IEEE80211_VERIFY_ELEMENT(xrates, 852 IEEE80211_RATE_MAXSIZE - rates[1], return); 853 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 854 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 855 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 856 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 857 wh, NULL, 858 "%s", "no ssid with ssid suppression enabled"); 859 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 860 return; 861 } 862 863 /* XXX find a better class or define it's own */ 864 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 865 "%s", "recv probe req"); 866 /* 867 * Some legacy 11b clients cannot hack a complete 868 * probe response frame. When the request includes 869 * only a bare-bones rate set, communicate this to 870 * the transmit side. 871 */ 872 ieee80211_send_proberesp(vap, wh->i_addr2, 873 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 874 break; 875 876 case IEEE80211_FC0_SUBTYPE_ACTION: 877 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 878 if (ni == vap->iv_bss) { 879 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 880 wh, NULL, "%s", "unknown node"); 881 vap->iv_stats.is_rx_mgtdiscard++; 882 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 883 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 884 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 885 wh, NULL, "%s", "not for us"); 886 vap->iv_stats.is_rx_mgtdiscard++; 887 } else if (vap->iv_state != IEEE80211_S_RUN) { 888 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 889 wh, NULL, "wrong state %s", 890 ieee80211_state_name[vap->iv_state]); 891 vap->iv_stats.is_rx_mgtdiscard++; 892 } else { 893 if (ieee80211_parse_action(ni, m0) == 0) 894 (void)ic->ic_recv_action(ni, wh, frm, efrm); 895 } 896 break; 897 898 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 899 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 900 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 901 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 902 case IEEE80211_FC0_SUBTYPE_ATIM: 903 case IEEE80211_FC0_SUBTYPE_DISASSOC: 904 case IEEE80211_FC0_SUBTYPE_AUTH: 905 case IEEE80211_FC0_SUBTYPE_DEAUTH: 906 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 907 wh, NULL, "%s", "not handled"); 908 vap->iv_stats.is_rx_mgtdiscard++; 909 break; 910 911 default: 912 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 913 wh, "mgt", "subtype 0x%x not handled", subtype); 914 vap->iv_stats.is_rx_badsubtype++; 915 break; 916 } 917 } 918 #undef IEEE80211_VERIFY_LENGTH 919 #undef IEEE80211_VERIFY_ELEMENT 920 921 static void 922 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 923 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 924 { 925 struct ieee80211vap *vap = ni->ni_vap; 926 struct ieee80211com *ic = ni->ni_ic; 927 struct ieee80211_frame *wh; 928 929 /* 930 * Process management frames when scanning; useful for doing 931 * a site-survey. 932 */ 933 if (ic->ic_flags & IEEE80211_F_SCAN) 934 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 935 else { 936 wh = mtod(m0, struct ieee80211_frame *); 937 switch (subtype) { 938 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 939 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 940 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 941 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 942 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 943 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 944 case IEEE80211_FC0_SUBTYPE_BEACON: 945 case IEEE80211_FC0_SUBTYPE_ATIM: 946 case IEEE80211_FC0_SUBTYPE_DISASSOC: 947 case IEEE80211_FC0_SUBTYPE_AUTH: 948 case IEEE80211_FC0_SUBTYPE_DEAUTH: 949 case IEEE80211_FC0_SUBTYPE_ACTION: 950 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 951 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 952 wh, NULL, "%s", "not handled"); 953 vap->iv_stats.is_rx_mgtdiscard++; 954 break; 955 default: 956 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 957 wh, "mgt", "subtype 0x%x not handled", subtype); 958 vap->iv_stats.is_rx_badsubtype++; 959 break; 960 } 961 } 962 } 963 964 static void 965 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 966 { 967 968 switch (subtype) { 969 case IEEE80211_FC0_SUBTYPE_BAR: 970 ieee80211_recv_bar(ni, m); 971 break; 972 } 973 } 974