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 67 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 68 69 static void adhoc_vattach(struct ieee80211vap *); 70 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 72 int rssi, int noise, uint32_t rstamp); 73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 74 int subtype, int rssi, int noise, uint32_t rstamp); 75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 76 int subtype, int rssi, int noise, uint32_t rstamp); 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, vap->iv_des_chan); 175 break; 176 } 177 /* 178 * Initiate a scan. We can come here as a result 179 * of an IEEE80211_IOC_SCAN_REQ too in which case 180 * the vap will be marked with IEEE80211_FEXT_SCANREQ 181 * and the scan request parameters will be present 182 * in iv_scanreq. Otherwise we do the default. 183 */ 184 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 185 ieee80211_check_scan(vap, 186 vap->iv_scanreq_flags, 187 vap->iv_scanreq_duration, 188 vap->iv_scanreq_mindwell, 189 vap->iv_scanreq_maxdwell, 190 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 191 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 192 } else 193 ieee80211_check_scan_current(vap); 194 break; 195 case IEEE80211_S_SCAN: 196 /* 197 * This can happen because of a change in state 198 * that requires a reset. Trigger a new scan 199 * unless we're in manual roaming mode in which 200 * case an application must issue an explicit request. 201 */ 202 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 203 ieee80211_check_scan_current(vap); 204 break; 205 default: 206 goto invalid; 207 } 208 break; 209 case IEEE80211_S_RUN: 210 if (vap->iv_flags & IEEE80211_F_WPA) { 211 /* XXX validate prerequisites */ 212 } 213 switch (ostate) { 214 case IEEE80211_S_SCAN: 215 #ifdef IEEE80211_DEBUG 216 if (ieee80211_msg_debug(vap)) { 217 ieee80211_note(vap, 218 "synchronized with %s ssid ", 219 ether_sprintf(ni->ni_bssid)); 220 ieee80211_print_essid(vap->iv_bss->ni_essid, 221 ni->ni_esslen); 222 /* XXX MCS/HT */ 223 printf(" channel %d start %uMb\n", 224 ieee80211_chan2ieee(ic, ic->ic_curchan), 225 IEEE80211_RATE2MBS(ni->ni_txrate)); 226 } 227 #endif 228 break; 229 default: 230 goto invalid; 231 } 232 /* 233 * When 802.1x is not in use mark the port authorized 234 * at this point so traffic can flow. 235 */ 236 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 237 ieee80211_node_authorize(ni); 238 /* 239 * Fake association when joining an existing bss. 240 */ 241 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 242 ic->ic_newassoc != NULL) 243 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 244 break; 245 case IEEE80211_S_SLEEP: 246 ieee80211_sta_pwrsave(vap, 0); 247 break; 248 default: 249 invalid: 250 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 251 "%s: unexpected state transition %s -> %s\n", __func__, 252 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 253 break; 254 } 255 return 0; 256 } 257 258 /* 259 * Decide if a received management frame should be 260 * printed when debugging is enabled. This filters some 261 * of the less interesting frames that come frequently 262 * (e.g. beacons). 263 */ 264 static __inline int 265 doprint(struct ieee80211vap *vap, int subtype) 266 { 267 switch (subtype) { 268 case IEEE80211_FC0_SUBTYPE_BEACON: 269 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 270 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 271 return 1; 272 } 273 return 1; 274 } 275 276 /* 277 * Process a received frame. The node associated with the sender 278 * should be supplied. If nothing was found in the node table then 279 * the caller is assumed to supply a reference to iv_bss instead. 280 * The RSSI and a timestamp are also supplied. The RSSI data is used 281 * during AP scanning to select a AP to associate with; it can have 282 * any units so long as values have consistent units and higher values 283 * mean ``better signal''. The receive timestamp is currently not used 284 * by the 802.11 layer. 285 */ 286 static int 287 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 288 int rssi, int noise, uint32_t rstamp) 289 { 290 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 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; 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 need_tap = 1; /* mbuf need to be tapped. */ 324 type = -1; /* undefined */ 325 326 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 327 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 328 ni->ni_macaddr, NULL, 329 "too short (1): len %u", m->m_pkthdr.len); 330 vap->iv_stats.is_rx_tooshort++; 331 goto out; 332 } 333 /* 334 * Bit of a cheat here, we use a pointer for a 3-address 335 * frame format but don't reference fields past outside 336 * ieee80211_frame_min w/o first validating the data is 337 * present. 338 */ 339 wh = mtod(m, struct ieee80211_frame *); 340 341 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 342 IEEE80211_FC0_VERSION_0) { 343 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 344 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 345 wh->i_fc[0], wh->i_fc[1]); 346 vap->iv_stats.is_rx_badversion++; 347 goto err; 348 } 349 350 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 351 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 352 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 353 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 354 if (dir != IEEE80211_FC1_DIR_NODS) 355 bssid = wh->i_addr1; 356 else if (type == IEEE80211_FC0_TYPE_CTL) 357 bssid = wh->i_addr1; 358 else { 359 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 360 IEEE80211_DISCARD_MAC(vap, 361 IEEE80211_MSG_ANY, ni->ni_macaddr, 362 NULL, "too short (2): len %u", 363 m->m_pkthdr.len); 364 vap->iv_stats.is_rx_tooshort++; 365 goto out; 366 } 367 bssid = wh->i_addr3; 368 } 369 /* 370 * Validate the bssid. 371 */ 372 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 373 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 374 /* not interested in */ 375 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 376 bssid, NULL, "%s", "not to bss"); 377 vap->iv_stats.is_rx_wrongbss++; 378 goto out; 379 } 380 /* 381 * Data frame, cons up a node when it doesn't 382 * exist. This should probably done after an ACL check. 383 */ 384 if (type == IEEE80211_FC0_TYPE_DATA && 385 ni == vap->iv_bss && 386 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 387 /* 388 * Beware of frames that come in too early; we 389 * can receive broadcast frames and creating sta 390 * entries will blow up because there is no bss 391 * channel yet. 392 */ 393 if (vap->iv_state != IEEE80211_S_RUN) { 394 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 395 wh, "data", "not in RUN state (%s)", 396 ieee80211_state_name[vap->iv_state]); 397 vap->iv_stats.is_rx_badstate++; 398 goto err; 399 } 400 /* 401 * Fake up a node for this newly 402 * discovered member of the IBSS. 403 */ 404 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 405 if (ni == NULL) { 406 /* NB: stat kept for alloc failure */ 407 goto err; 408 } 409 } 410 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 411 ni->ni_noise = noise; 412 ni->ni_rstamp = rstamp; 413 if (HAS_SEQ(type)) { 414 uint8_t tid = ieee80211_gettid(wh); 415 if (IEEE80211_QOS_HAS_SEQ(wh) && 416 TID_TO_WME_AC(tid) >= WME_AC_VI) 417 ic->ic_wme.wme_hipri_traffic++; 418 rxseq = le16toh(*(uint16_t *)wh->i_seq); 419 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 420 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 421 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 422 /* duplicate, discard */ 423 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 424 bssid, "duplicate", 425 "seqno <%u,%u> fragno <%u,%u> tid %u", 426 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 427 ni->ni_rxseqs[tid] >> 428 IEEE80211_SEQ_SEQ_SHIFT, 429 rxseq & IEEE80211_SEQ_FRAG_MASK, 430 ni->ni_rxseqs[tid] & 431 IEEE80211_SEQ_FRAG_MASK, 432 tid); 433 vap->iv_stats.is_rx_dup++; 434 IEEE80211_NODE_STAT(ni, rx_dup); 435 goto out; 436 } 437 ni->ni_rxseqs[tid] = rxseq; 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_WEP) { 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_WEP; 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 (bpf_peers_present(vap->iv_rawbpf)) 540 bpf_mtap(vap->iv_rawbpf, 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 IEEE80211_FC0_SUBTYPE_SHIFT], 634 ether_sprintf(wh->i_addr2), rssi); 635 } 636 #endif 637 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 638 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 639 wh, NULL, "%s", "WEP set but not permitted"); 640 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 641 goto out; 642 } 643 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 644 goto out; 645 646 case IEEE80211_FC0_TYPE_CTL: 647 vap->iv_stats.is_rx_ctl++; 648 IEEE80211_NODE_STAT(ni, rx_ctrl); 649 vap->iv_recv_ctl(ni, m, subtype); 650 goto out; 651 652 default: 653 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 654 wh, "bad", "frame type 0x%x", type); 655 /* should not come here */ 656 break; 657 } 658 err: 659 ifp->if_ierrors++; 660 out: 661 if (m != NULL) { 662 if (need_tap && bpf_peers_present(vap->iv_rawbpf)) 663 bpf_mtap(vap->iv_rawbpf, m); 664 m_freem(m); 665 } 666 return type; 667 #undef SEQ_LEQ 668 } 669 670 static int 671 is11bclient(const uint8_t *rates, const uint8_t *xrates) 672 { 673 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 674 int i; 675 676 /* NB: the 11b clients we care about will not have xrates */ 677 if (xrates != NULL || rates == NULL) 678 return 0; 679 for (i = 0; i < rates[1]; i++) { 680 int r = rates[2+i] & IEEE80211_RATE_VAL; 681 if (r > 2*11 || ((1<<r) & brates) == 0) 682 return 0; 683 } 684 return 1; 685 } 686 687 static void 688 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 689 int subtype, int rssi, int noise, uint32_t rstamp) 690 { 691 struct ieee80211vap *vap = ni->ni_vap; 692 struct ieee80211com *ic = ni->ni_ic; 693 struct ieee80211_frame *wh; 694 uint8_t *frm, *efrm, *sfrm; 695 uint8_t *ssid, *rates, *xrates; 696 697 wh = mtod(m0, struct ieee80211_frame *); 698 frm = (uint8_t *)&wh[1]; 699 efrm = mtod(m0, uint8_t *) + m0->m_len; 700 switch (subtype) { 701 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 702 case IEEE80211_FC0_SUBTYPE_BEACON: { 703 struct ieee80211_scanparams scan; 704 /* 705 * We process beacon/probe response 706 * frames to discover neighbors. 707 */ 708 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 709 return; 710 /* 711 * Count frame now that we know it's to be processed. 712 */ 713 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 714 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 715 IEEE80211_NODE_STAT(ni, rx_beacons); 716 } else 717 IEEE80211_NODE_STAT(ni, rx_proberesp); 718 /* 719 * If scanning, just pass information to the scan module. 720 */ 721 if (ic->ic_flags & IEEE80211_F_SCAN) { 722 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 723 /* 724 * Actively scanning a channel marked passive; 725 * send a probe request now that we know there 726 * is 802.11 traffic present. 727 * 728 * XXX check if the beacon we recv'd gives 729 * us what we need and suppress the probe req 730 */ 731 ieee80211_probe_curchan(vap, 1); 732 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 733 } 734 ieee80211_add_scan(vap, &scan, wh, 735 subtype, rssi, noise, rstamp); 736 return; 737 } 738 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 739 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 740 /* 741 * Create a new entry in the neighbor table. 742 */ 743 ni = ieee80211_add_neighbor(vap, wh, &scan); 744 } else if (ni->ni_capinfo == 0) { 745 /* 746 * Update faked node created on transmit. 747 * Note this also updates the tsf. 748 */ 749 ieee80211_init_neighbor(ni, wh, &scan); 750 } else { 751 /* 752 * Record tsf for potential resync. 753 */ 754 memcpy(ni->ni_tstamp.data, scan.tstamp, 755 sizeof(ni->ni_tstamp)); 756 } 757 if (ni != NULL) { 758 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 759 ni->ni_noise = noise; 760 ni->ni_rstamp = rstamp; 761 } 762 } 763 break; 764 } 765 766 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 767 if (vap->iv_state != IEEE80211_S_RUN) { 768 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 769 wh, NULL, "wrong state %s", 770 ieee80211_state_name[vap->iv_state]); 771 vap->iv_stats.is_rx_mgtdiscard++; 772 return; 773 } 774 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 775 /* frame must be directed */ 776 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 777 wh, NULL, "%s", "not unicast"); 778 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 779 return; 780 } 781 782 /* 783 * prreq frame format 784 * [tlv] ssid 785 * [tlv] supported rates 786 * [tlv] extended supported rates 787 */ 788 ssid = rates = xrates = NULL; 789 sfrm = frm; 790 while (efrm - frm > 1) { 791 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 792 switch (*frm) { 793 case IEEE80211_ELEMID_SSID: 794 ssid = frm; 795 break; 796 case IEEE80211_ELEMID_RATES: 797 rates = frm; 798 break; 799 case IEEE80211_ELEMID_XRATES: 800 xrates = frm; 801 break; 802 } 803 frm += frm[1] + 2; 804 } 805 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 806 if (xrates != NULL) 807 IEEE80211_VERIFY_ELEMENT(xrates, 808 IEEE80211_RATE_MAXSIZE - rates[1], return); 809 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 810 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 811 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 812 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 813 wh, NULL, 814 "%s", "no ssid with ssid suppression enabled"); 815 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 816 return; 817 } 818 819 /* XXX find a better class or define it's own */ 820 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 821 "%s", "recv probe req"); 822 /* 823 * Some legacy 11b clients cannot hack a complete 824 * probe response frame. When the request includes 825 * only a bare-bones rate set, communicate this to 826 * the transmit side. 827 */ 828 ieee80211_send_proberesp(vap, wh->i_addr2, 829 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 830 break; 831 832 case IEEE80211_FC0_SUBTYPE_ACTION: { 833 const struct ieee80211_action *ia; 834 835 if (vap->iv_state != IEEE80211_S_RUN) { 836 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 837 wh, NULL, "wrong state %s", 838 ieee80211_state_name[vap->iv_state]); 839 vap->iv_stats.is_rx_mgtdiscard++; 840 return; 841 } 842 /* 843 * action frame format: 844 * [1] category 845 * [1] action 846 * [tlv] parameters 847 */ 848 IEEE80211_VERIFY_LENGTH(efrm - frm, 849 sizeof(struct ieee80211_action), return); 850 ia = (const struct ieee80211_action *) frm; 851 852 vap->iv_stats.is_rx_action++; 853 IEEE80211_NODE_STAT(ni, rx_action); 854 855 /* verify frame payloads but defer processing */ 856 /* XXX maybe push this to method */ 857 switch (ia->ia_category) { 858 case IEEE80211_ACTION_CAT_BA: 859 switch (ia->ia_action) { 860 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 861 IEEE80211_VERIFY_LENGTH(efrm - frm, 862 sizeof(struct ieee80211_action_ba_addbarequest), 863 return); 864 break; 865 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 866 IEEE80211_VERIFY_LENGTH(efrm - frm, 867 sizeof(struct ieee80211_action_ba_addbaresponse), 868 return); 869 break; 870 case IEEE80211_ACTION_BA_DELBA: 871 IEEE80211_VERIFY_LENGTH(efrm - frm, 872 sizeof(struct ieee80211_action_ba_delba), 873 return); 874 break; 875 } 876 break; 877 case IEEE80211_ACTION_CAT_HT: 878 switch (ia->ia_action) { 879 case IEEE80211_ACTION_HT_TXCHWIDTH: 880 IEEE80211_VERIFY_LENGTH(efrm - frm, 881 sizeof(struct ieee80211_action_ht_txchwidth), 882 return); 883 break; 884 } 885 break; 886 } 887 ic->ic_recv_action(ni, frm, efrm); 888 break; 889 } 890 891 case IEEE80211_FC0_SUBTYPE_AUTH: 892 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 893 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 894 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 895 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 896 case IEEE80211_FC0_SUBTYPE_DEAUTH: 897 case IEEE80211_FC0_SUBTYPE_DISASSOC: 898 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 899 wh, NULL, "%s", "not handled"); 900 vap->iv_stats.is_rx_mgtdiscard++; 901 return; 902 903 default: 904 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 905 wh, "mgt", "subtype 0x%x not handled", subtype); 906 vap->iv_stats.is_rx_badsubtype++; 907 break; 908 } 909 } 910 #undef IEEE80211_VERIFY_LENGTH 911 #undef IEEE80211_VERIFY_ELEMENT 912 913 static void 914 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 915 int subtype, int rssi, int noise, uint32_t rstamp) 916 { 917 struct ieee80211vap *vap = ni->ni_vap; 918 struct ieee80211com *ic = ni->ni_ic; 919 920 /* 921 * Process management frames when scanning; useful for doing 922 * a site-survey. 923 */ 924 if (ic->ic_flags & IEEE80211_F_SCAN) 925 adhoc_recv_mgmt(ni, m0, subtype, rssi, noise, rstamp); 926 else 927 vap->iv_stats.is_rx_mgtdiscard++; 928 } 929 930 static void 931 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) 932 { 933 } 934