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_TDMA 61 #include <net80211/ieee80211_tdma.h> 62 #endif 63 64 #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) 65 66 static void adhoc_vattach(struct ieee80211vap *); 67 static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); 68 static int adhoc_input(struct ieee80211_node *, struct mbuf *, 69 int rssi, int noise, uint32_t rstamp); 70 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, 71 int subtype, int rssi, int noise, uint32_t rstamp); 72 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, 73 int subtype, int rssi, int noise, uint32_t rstamp); 74 75 void 76 ieee80211_adhoc_attach(struct ieee80211com *ic) 77 { 78 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; 79 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; 80 } 81 82 void 83 ieee80211_adhoc_detach(struct ieee80211com *ic) 84 { 85 } 86 87 static void 88 adhoc_vdetach(struct ieee80211vap *vap) 89 { 90 } 91 92 static void 93 adhoc_vattach(struct ieee80211vap *vap) 94 { 95 vap->iv_newstate = adhoc_newstate; 96 vap->iv_input = adhoc_input; 97 if (vap->iv_opmode == IEEE80211_M_IBSS) 98 vap->iv_recv_mgmt = adhoc_recv_mgmt; 99 else 100 vap->iv_recv_mgmt = ahdemo_recv_mgmt; 101 vap->iv_opdetach = adhoc_vdetach; 102 #ifdef IEEE80211_SUPPORT_TDMA 103 /* 104 * Throw control to tdma support. Note we do this 105 * after setting up our callbacks so it can piggyback 106 * on top of us. 107 */ 108 if (vap->iv_caps & IEEE80211_C_TDMA) 109 ieee80211_tdma_vattach(vap); 110 #endif 111 } 112 113 static void 114 sta_leave(void *arg, struct ieee80211_node *ni) 115 { 116 struct ieee80211vap *vap = arg; 117 118 if (ni->ni_vap == vap && ni != vap->iv_bss) 119 ieee80211_node_leave(ni); 120 } 121 122 /* 123 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. 124 */ 125 static int 126 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 127 { 128 struct ieee80211com *ic = vap->iv_ic; 129 struct ieee80211_node *ni; 130 enum ieee80211_state ostate; 131 132 IEEE80211_LOCK_ASSERT(vap->iv_ic); 133 134 ostate = vap->iv_state; 135 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 136 __func__, ieee80211_state_name[ostate], 137 ieee80211_state_name[nstate], arg); 138 vap->iv_state = nstate; /* state transition */ 139 if (ostate != IEEE80211_S_SCAN) 140 ieee80211_cancel_scan(vap); /* background scan */ 141 ni = vap->iv_bss; /* NB: no reference held */ 142 switch (nstate) { 143 case IEEE80211_S_INIT: 144 switch (ostate) { 145 case IEEE80211_S_SCAN: 146 ieee80211_cancel_scan(vap); 147 break; 148 default: 149 break; 150 } 151 if (ostate != IEEE80211_S_INIT) { 152 /* NB: optimize INIT -> INIT case */ 153 ieee80211_reset_bss(vap); 154 } 155 break; 156 case IEEE80211_S_SCAN: 157 switch (ostate) { 158 case IEEE80211_S_RUN: /* beacon miss */ 159 /* purge station table; entries are stale */ 160 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); 161 /* fall thru... */ 162 case IEEE80211_S_INIT: 163 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 164 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 165 /* 166 * Already have a channel; bypass the 167 * scan and startup immediately. 168 */ 169 ieee80211_create_ibss(vap, vap->iv_des_chan); 170 break; 171 } 172 /* 173 * Initiate a scan. We can come here as a result 174 * of an IEEE80211_IOC_SCAN_REQ too in which case 175 * the vap will be marked with IEEE80211_FEXT_SCANREQ 176 * and the scan request parameters will be present 177 * in iv_scanreq. Otherwise we do the default. 178 */ 179 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 180 ieee80211_check_scan(vap, 181 vap->iv_scanreq_flags, 182 vap->iv_scanreq_duration, 183 vap->iv_scanreq_mindwell, 184 vap->iv_scanreq_maxdwell, 185 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 186 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 187 } else 188 ieee80211_check_scan_current(vap); 189 break; 190 case IEEE80211_S_SCAN: 191 /* 192 * This can happen because of a change in state 193 * that requires a reset. Trigger a new scan 194 * unless we're in manual roaming mode in which 195 * case an application must issue an explicit request. 196 */ 197 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 198 ieee80211_check_scan_current(vap); 199 break; 200 default: 201 goto invalid; 202 } 203 break; 204 case IEEE80211_S_RUN: 205 if (vap->iv_flags & IEEE80211_F_WPA) { 206 /* XXX validate prerequisites */ 207 } 208 switch (ostate) { 209 case IEEE80211_S_SCAN: 210 #ifdef IEEE80211_DEBUG 211 if (ieee80211_msg_debug(vap)) { 212 ieee80211_note(vap, 213 "synchronized with %s ssid ", 214 ether_sprintf(ni->ni_bssid)); 215 ieee80211_print_essid(vap->iv_bss->ni_essid, 216 ni->ni_esslen); 217 /* XXX MCS/HT */ 218 printf(" channel %d start %uMb\n", 219 ieee80211_chan2ieee(ic, ic->ic_curchan), 220 IEEE80211_RATE2MBS(ni->ni_txrate)); 221 } 222 #endif 223 break; 224 default: 225 goto invalid; 226 } 227 /* 228 * When 802.1x is not in use mark the port authorized 229 * at this point so traffic can flow. 230 */ 231 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 232 ieee80211_node_authorize(ni); 233 /* 234 * Fake association when joining an existing bss. 235 */ 236 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 237 ic->ic_newassoc != NULL) 238 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 239 break; 240 case IEEE80211_S_SLEEP: 241 ieee80211_sta_pwrsave(vap, 0); 242 break; 243 default: 244 invalid: 245 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 246 "%s: unexpected state transition %s -> %s\n", __func__, 247 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 248 break; 249 } 250 return 0; 251 } 252 253 /* 254 * Decide if a received management frame should be 255 * printed when debugging is enabled. This filters some 256 * of the less interesting frames that come frequently 257 * (e.g. beacons). 258 */ 259 static __inline int 260 doprint(struct ieee80211vap *vap, int subtype) 261 { 262 switch (subtype) { 263 case IEEE80211_FC0_SUBTYPE_BEACON: 264 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 265 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 266 return 1; 267 } 268 return 1; 269 } 270 271 /* 272 * Process a received frame. The node associated with the sender 273 * should be supplied. If nothing was found in the node table then 274 * the caller is assumed to supply a reference to iv_bss instead. 275 * The RSSI and a timestamp are also supplied. The RSSI data is used 276 * during AP scanning to select a AP to associate with; it can have 277 * any units so long as values have consistent units and higher values 278 * mean ``better signal''. The receive timestamp is currently not used 279 * by the 802.11 layer. 280 */ 281 static int 282 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 283 int rssi, int noise, uint32_t rstamp) 284 { 285 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 286 #define HAS_SEQ(type) ((type & 0x4) == 0) 287 struct ieee80211vap *vap = ni->ni_vap; 288 struct ieee80211com *ic = ni->ni_ic; 289 struct ifnet *ifp = vap->iv_ifp; 290 struct ieee80211_frame *wh; 291 struct ieee80211_key *key; 292 struct ether_header *eh; 293 int hdrspace, need_tap; 294 uint8_t dir, type, subtype, qos; 295 uint8_t *bssid; 296 uint16_t rxseq; 297 298 if (m->m_flags & M_AMPDU_MPDU) { 299 /* 300 * Fastpath for A-MPDU reorder q resubmission. Frames 301 * w/ M_AMPDU_MPDU marked have already passed through 302 * here but were received out of order and been held on 303 * the reorder queue. When resubmitted they are marked 304 * with the M_AMPDU_MPDU flag and we can bypass most of 305 * the normal processing. 306 */ 307 wh = mtod(m, struct ieee80211_frame *); 308 type = IEEE80211_FC0_TYPE_DATA; 309 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 310 subtype = IEEE80211_FC0_SUBTYPE_QOS; 311 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 312 goto resubmit_ampdu; 313 } 314 315 KASSERT(ni != NULL, ("null node")); 316 ni->ni_inact = ni->ni_inact_reload; 317 318 need_tap = 1; /* mbuf need to be tapped. */ 319 type = -1; /* undefined */ 320 321 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 322 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 323 ni->ni_macaddr, NULL, 324 "too short (1): len %u", m->m_pkthdr.len); 325 vap->iv_stats.is_rx_tooshort++; 326 goto out; 327 } 328 /* 329 * Bit of a cheat here, we use a pointer for a 3-address 330 * frame format but don't reference fields past outside 331 * ieee80211_frame_min w/o first validating the data is 332 * present. 333 */ 334 wh = mtod(m, struct ieee80211_frame *); 335 336 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 337 IEEE80211_FC0_VERSION_0) { 338 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 339 ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]); 340 vap->iv_stats.is_rx_badversion++; 341 goto err; 342 } 343 344 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 345 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 346 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 347 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 348 if (dir != IEEE80211_FC1_DIR_NODS) 349 bssid = wh->i_addr1; 350 else if (type == IEEE80211_FC0_TYPE_CTL) 351 bssid = wh->i_addr1; 352 else { 353 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 354 IEEE80211_DISCARD_MAC(vap, 355 IEEE80211_MSG_ANY, ni->ni_macaddr, 356 NULL, "too short (2): len %u", 357 m->m_pkthdr.len); 358 vap->iv_stats.is_rx_tooshort++; 359 goto out; 360 } 361 bssid = wh->i_addr3; 362 } 363 /* 364 * Validate the bssid. 365 */ 366 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 367 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 368 /* not interested in */ 369 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 370 bssid, NULL, "%s", "not to bss"); 371 vap->iv_stats.is_rx_wrongbss++; 372 goto out; 373 } 374 /* 375 * Data frame, cons up a node when it doesn't 376 * exist. This should probably done after an ACL check. 377 */ 378 if (type == IEEE80211_FC0_TYPE_DATA && 379 ni == vap->iv_bss && 380 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 381 /* 382 * Beware of frames that come in too early; we 383 * can receive broadcast frames and creating sta 384 * entries will blow up because there is no bss 385 * channel yet. 386 */ 387 if (vap->iv_state != IEEE80211_S_RUN) { 388 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 389 wh, "data", "not in RUN state (%s)", 390 ieee80211_state_name[vap->iv_state]); 391 vap->iv_stats.is_rx_badstate++; 392 goto err; 393 } 394 /* 395 * Fake up a node for this newly 396 * discovered member of the IBSS. 397 */ 398 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 399 if (ni == NULL) { 400 /* NB: stat kept for alloc failure */ 401 goto err; 402 } 403 } 404 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 405 ni->ni_noise = noise; 406 ni->ni_rstamp = rstamp; 407 if (HAS_SEQ(type)) { 408 uint8_t tid = ieee80211_gettid(wh); 409 if (IEEE80211_QOS_HAS_SEQ(wh) && 410 TID_TO_WME_AC(tid) >= WME_AC_VI) 411 ic->ic_wme.wme_hipri_traffic++; 412 rxseq = le16toh(*(uint16_t *)wh->i_seq); 413 if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && 414 (wh->i_fc[1] & IEEE80211_FC1_RETRY) && 415 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { 416 /* duplicate, discard */ 417 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 418 bssid, "duplicate", 419 "seqno <%u,%u> fragno <%u,%u> tid %u", 420 rxseq >> IEEE80211_SEQ_SEQ_SHIFT, 421 ni->ni_rxseqs[tid] >> 422 IEEE80211_SEQ_SEQ_SHIFT, 423 rxseq & IEEE80211_SEQ_FRAG_MASK, 424 ni->ni_rxseqs[tid] & 425 IEEE80211_SEQ_FRAG_MASK, 426 tid); 427 vap->iv_stats.is_rx_dup++; 428 IEEE80211_NODE_STAT(ni, rx_dup); 429 goto out; 430 } 431 ni->ni_rxseqs[tid] = rxseq; 432 } 433 } 434 435 switch (type) { 436 case IEEE80211_FC0_TYPE_DATA: 437 hdrspace = ieee80211_hdrspace(ic, wh); 438 if (m->m_len < hdrspace && 439 (m = m_pullup(m, hdrspace)) == NULL) { 440 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 441 ni->ni_macaddr, NULL, 442 "data too short: expecting %u", hdrspace); 443 vap->iv_stats.is_rx_tooshort++; 444 goto out; /* XXX */ 445 } 446 if (dir != IEEE80211_FC1_DIR_NODS) { 447 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 448 wh, "data", "incorrect dir 0x%x", dir); 449 vap->iv_stats.is_rx_wrongdir++; 450 goto out; 451 } 452 /* XXX no power-save support */ 453 454 /* 455 * Handle A-MPDU re-ordering. If the frame is to be 456 * processed directly then ieee80211_ampdu_reorder 457 * will return 0; otherwise it has consumed the mbuf 458 * and we should do nothing more with it. 459 */ 460 if ((m->m_flags & M_AMPDU) && 461 ieee80211_ampdu_reorder(ni, m) != 0) { 462 m = NULL; 463 goto out; 464 } 465 resubmit_ampdu: 466 467 /* 468 * Handle privacy requirements. Note that we 469 * must not be preempted from here until after 470 * we (potentially) call ieee80211_crypto_demic; 471 * otherwise we may violate assumptions in the 472 * crypto cipher modules used to do delayed update 473 * of replay sequence numbers. 474 */ 475 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 476 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 477 /* 478 * Discard encrypted frames when privacy is off. 479 */ 480 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 481 wh, "WEP", "%s", "PRIVACY off"); 482 vap->iv_stats.is_rx_noprivacy++; 483 IEEE80211_NODE_STAT(ni, rx_noprivacy); 484 goto out; 485 } 486 key = ieee80211_crypto_decap(ni, m, hdrspace); 487 if (key == NULL) { 488 /* NB: stats+msgs handled in crypto_decap */ 489 IEEE80211_NODE_STAT(ni, rx_wepfail); 490 goto out; 491 } 492 wh = mtod(m, struct ieee80211_frame *); 493 wh->i_fc[1] &= ~IEEE80211_FC1_WEP; 494 } else { 495 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 496 key = NULL; 497 } 498 499 /* 500 * Save QoS bits for use below--before we strip the header. 501 */ 502 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 503 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 504 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 505 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 506 } else 507 qos = 0; 508 509 /* 510 * Next up, any fragmentation. 511 */ 512 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 513 m = ieee80211_defrag(ni, m, hdrspace); 514 if (m == NULL) { 515 /* Fragment dropped or frame not complete yet */ 516 goto out; 517 } 518 } 519 wh = NULL; /* no longer valid, catch any uses */ 520 521 /* 522 * Next strip any MSDU crypto bits. 523 */ 524 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { 525 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 526 ni->ni_macaddr, "data", "%s", "demic error"); 527 vap->iv_stats.is_rx_demicfail++; 528 IEEE80211_NODE_STAT(ni, rx_demicfail); 529 goto out; 530 } 531 532 /* copy to listener after decrypt */ 533 if (bpf_peers_present(vap->iv_rawbpf)) 534 bpf_mtap(vap->iv_rawbpf, m); 535 need_tap = 0; 536 537 /* 538 * Finally, strip the 802.11 header. 539 */ 540 m = ieee80211_decap(vap, m, hdrspace); 541 if (m == NULL) { 542 /* XXX mask bit to check for both */ 543 /* don't count Null data frames as errors */ 544 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 545 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 546 goto out; 547 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 548 ni->ni_macaddr, "data", "%s", "decap error"); 549 vap->iv_stats.is_rx_decap++; 550 IEEE80211_NODE_STAT(ni, rx_decap); 551 goto err; 552 } 553 eh = mtod(m, struct ether_header *); 554 if (!ieee80211_node_is_authorized(ni)) { 555 /* 556 * Deny any non-PAE frames received prior to 557 * authorization. For open/shared-key 558 * authentication the port is mark authorized 559 * after authentication completes. For 802.1x 560 * the port is not marked authorized by the 561 * authenticator until the handshake has completed. 562 */ 563 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 564 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 565 eh->ether_shost, "data", 566 "unauthorized port: ether type 0x%x len %u", 567 eh->ether_type, m->m_pkthdr.len); 568 vap->iv_stats.is_rx_unauth++; 569 IEEE80211_NODE_STAT(ni, rx_unauth); 570 goto err; 571 } 572 } else { 573 /* 574 * When denying unencrypted frames, discard 575 * any non-PAE frames received without encryption. 576 */ 577 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 578 (key == NULL && (m->m_flags & M_WEP) == 0) && 579 eh->ether_type != htons(ETHERTYPE_PAE)) { 580 /* 581 * Drop unencrypted frames. 582 */ 583 vap->iv_stats.is_rx_unencrypted++; 584 IEEE80211_NODE_STAT(ni, rx_unencrypted); 585 goto out; 586 } 587 } 588 /* XXX require HT? */ 589 if (qos & IEEE80211_QOS_AMSDU) { 590 m = ieee80211_decap_amsdu(ni, m); 591 if (m == NULL) 592 return IEEE80211_FC0_TYPE_DATA; 593 } else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) && 594 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 595 m->m_pkthdr.len >= 3*FF_LLC_SIZE) { 596 struct llc *llc; 597 598 /* 599 * Check for fast-frame tunnel encapsulation. 600 */ 601 if (m->m_len < FF_LLC_SIZE && 602 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 603 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 604 ni->ni_macaddr, "fast-frame", 605 "%s", "m_pullup(llc) failed"); 606 vap->iv_stats.is_rx_tooshort++; 607 return IEEE80211_FC0_TYPE_DATA; 608 } 609 llc = (struct llc *)(mtod(m, uint8_t *) + 610 sizeof(struct ether_header)); 611 if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { 612 m_adj(m, FF_LLC_SIZE); 613 m = ieee80211_decap_fastframe(ni, m); 614 if (m == NULL) 615 return IEEE80211_FC0_TYPE_DATA; 616 } 617 } 618 #undef FF_LLC_SIZE 619 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 620 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 621 else 622 ieee80211_deliver_data(vap, ni, m); 623 return IEEE80211_FC0_TYPE_DATA; 624 625 case IEEE80211_FC0_TYPE_MGT: 626 vap->iv_stats.is_rx_mgmt++; 627 IEEE80211_NODE_STAT(ni, rx_mgmt); 628 if (dir != IEEE80211_FC1_DIR_NODS) { 629 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 630 wh, "data", "incorrect dir 0x%x", dir); 631 vap->iv_stats.is_rx_wrongdir++; 632 goto err; 633 } 634 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 635 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 636 ni->ni_macaddr, "mgt", "too short: len %u", 637 m->m_pkthdr.len); 638 vap->iv_stats.is_rx_tooshort++; 639 goto out; 640 } 641 #ifdef IEEE80211_DEBUG 642 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 643 ieee80211_msg_dumppkts(vap)) { 644 if_printf(ifp, "received %s from %s rssi %d\n", 645 ieee80211_mgt_subtype_name[subtype >> 646 IEEE80211_FC0_SUBTYPE_SHIFT], 647 ether_sprintf(wh->i_addr2), rssi); 648 } 649 #endif 650 if (wh->i_fc[1] & IEEE80211_FC1_WEP) { 651 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 652 wh, NULL, "%s", "WEP set but not permitted"); 653 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 654 goto out; 655 } 656 if (bpf_peers_present(vap->iv_rawbpf)) 657 bpf_mtap(vap->iv_rawbpf, m); 658 vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp); 659 m_freem(m); 660 return IEEE80211_FC0_TYPE_MGT; 661 662 case IEEE80211_FC0_TYPE_CTL: 663 vap->iv_stats.is_rx_ctl++; 664 IEEE80211_NODE_STAT(ni, rx_ctrl); 665 goto out; 666 default: 667 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 668 wh, "bad", "frame type 0x%x", type); 669 /* should not come here */ 670 break; 671 } 672 err: 673 ifp->if_ierrors++; 674 out: 675 if (m != NULL) { 676 if (bpf_peers_present(vap->iv_rawbpf) && need_tap) 677 bpf_mtap(vap->iv_rawbpf, m); 678 m_freem(m); 679 } 680 return type; 681 #undef SEQ_LEQ 682 } 683 684 static int 685 is11bclient(const uint8_t *rates, const uint8_t *xrates) 686 { 687 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); 688 int i; 689 690 /* NB: the 11b clients we care about will not have xrates */ 691 if (xrates != NULL || rates == NULL) 692 return 0; 693 for (i = 0; i < rates[1]; i++) { 694 int r = rates[2+i] & IEEE80211_RATE_VAL; 695 if (r > 2*11 || ((1<<r) & brates) == 0) 696 return 0; 697 } 698 return 1; 699 } 700 701 static void 702 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 703 int subtype, int rssi, int noise, uint32_t rstamp) 704 { 705 struct ieee80211vap *vap = ni->ni_vap; 706 struct ieee80211com *ic = ni->ni_ic; 707 struct ieee80211_frame *wh; 708 uint8_t *frm, *efrm, *sfrm; 709 uint8_t *ssid, *rates, *xrates; 710 711 wh = mtod(m0, struct ieee80211_frame *); 712 frm = (uint8_t *)&wh[1]; 713 efrm = mtod(m0, uint8_t *) + m0->m_len; 714 switch (subtype) { 715 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 716 case IEEE80211_FC0_SUBTYPE_BEACON: { 717 struct ieee80211_scanparams scan; 718 /* 719 * We process beacon/probe response 720 * frames to discover neighbors. 721 */ 722 if (ieee80211_parse_beacon(ni, m0, &scan) != 0) 723 return; 724 /* 725 * Count frame now that we know it's to be processed. 726 */ 727 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 728 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 729 IEEE80211_NODE_STAT(ni, rx_beacons); 730 } else 731 IEEE80211_NODE_STAT(ni, rx_proberesp); 732 /* 733 * If scanning, just pass information to the scan module. 734 */ 735 if (ic->ic_flags & IEEE80211_F_SCAN) { 736 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 737 /* 738 * Actively scanning a channel marked passive; 739 * send a probe request now that we know there 740 * is 802.11 traffic present. 741 * 742 * XXX check if the beacon we recv'd gives 743 * us what we need and suppress the probe req 744 */ 745 ieee80211_probe_curchan(vap, 1); 746 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 747 } 748 ieee80211_add_scan(vap, &scan, wh, 749 subtype, rssi, noise, rstamp); 750 return; 751 } 752 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 753 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 754 /* 755 * Create a new entry in the neighbor table. 756 */ 757 ni = ieee80211_add_neighbor(vap, wh, &scan); 758 } else if (ni->ni_capinfo == 0) { 759 /* 760 * Update faked node created on transmit. 761 * Note this also updates the tsf. 762 */ 763 ieee80211_init_neighbor(ni, wh, &scan); 764 } else { 765 /* 766 * Record tsf for potential resync. 767 */ 768 memcpy(ni->ni_tstamp.data, scan.tstamp, 769 sizeof(ni->ni_tstamp)); 770 } 771 if (ni != NULL) { 772 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 773 ni->ni_noise = noise; 774 ni->ni_rstamp = rstamp; 775 } 776 } 777 break; 778 } 779 780 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 781 if (vap->iv_state != IEEE80211_S_RUN) { 782 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 783 wh, NULL, "wrong state %s", 784 ieee80211_state_name[vap->iv_state]); 785 vap->iv_stats.is_rx_mgtdiscard++; 786 return; 787 } 788 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 789 /* frame must be directed */ 790 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 791 wh, NULL, "%s", "not unicast"); 792 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 793 return; 794 } 795 796 /* 797 * prreq frame format 798 * [tlv] ssid 799 * [tlv] supported rates 800 * [tlv] extended supported rates 801 */ 802 ssid = rates = xrates = NULL; 803 sfrm = frm; 804 while (efrm - frm > 1) { 805 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 806 switch (*frm) { 807 case IEEE80211_ELEMID_SSID: 808 ssid = frm; 809 break; 810 case IEEE80211_ELEMID_RATES: 811 rates = frm; 812 break; 813 case IEEE80211_ELEMID_XRATES: 814 xrates = frm; 815 break; 816 } 817 frm += frm[1] + 2; 818 } 819 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 820 if (xrates != NULL) 821 IEEE80211_VERIFY_ELEMENT(xrates, 822 IEEE80211_RATE_MAXSIZE - rates[1], return); 823 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 824 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 825 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 826 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 827 wh, NULL, 828 "%s", "no ssid with ssid suppression enabled"); 829 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 830 return; 831 } 832 833 /* XXX find a better class or define it's own */ 834 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 835 "%s", "recv probe req"); 836 /* 837 * Some legacy 11b clients cannot hack a complete 838 * probe response frame. When the request includes 839 * only a bare-bones rate set, communicate this to 840 * the transmit side. 841 */ 842 ieee80211_send_proberesp(vap, wh->i_addr2, 843 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 844 break; 845 846 case IEEE80211_FC0_SUBTYPE_ACTION: { 847 const struct ieee80211_action *ia; 848 849 if (vap->iv_state != IEEE80211_S_RUN) { 850 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 851 wh, NULL, "wrong state %s", 852 ieee80211_state_name[vap->iv_state]); 853 vap->iv_stats.is_rx_mgtdiscard++; 854 return; 855 } 856 /* 857 * action frame format: 858 * [1] category 859 * [1] action 860 * [tlv] parameters 861 */ 862 IEEE80211_VERIFY_LENGTH(efrm - frm, 863 sizeof(struct ieee80211_action), return); 864 ia = (const struct ieee80211_action *) frm; 865 866 vap->iv_stats.is_rx_action++; 867 IEEE80211_NODE_STAT(ni, rx_action); 868 869 /* verify frame payloads but defer processing */ 870 /* XXX maybe push this to method */ 871 switch (ia->ia_category) { 872 case IEEE80211_ACTION_CAT_BA: 873 switch (ia->ia_action) { 874 case IEEE80211_ACTION_BA_ADDBA_REQUEST: 875 IEEE80211_VERIFY_LENGTH(efrm - frm, 876 sizeof(struct ieee80211_action_ba_addbarequest), 877 return); 878 break; 879 case IEEE80211_ACTION_BA_ADDBA_RESPONSE: 880 IEEE80211_VERIFY_LENGTH(efrm - frm, 881 sizeof(struct ieee80211_action_ba_addbaresponse), 882 return); 883 break; 884 case IEEE80211_ACTION_BA_DELBA: 885 IEEE80211_VERIFY_LENGTH(efrm - frm, 886 sizeof(struct ieee80211_action_ba_delba), 887 return); 888 break; 889 } 890 break; 891 case IEEE80211_ACTION_CAT_HT: 892 switch (ia->ia_action) { 893 case IEEE80211_ACTION_HT_TXCHWIDTH: 894 IEEE80211_VERIFY_LENGTH(efrm - frm, 895 sizeof(struct ieee80211_action_ht_txchwidth), 896 return); 897 break; 898 } 899 break; 900 } 901 ic->ic_recv_action(ni, frm, efrm); 902 break; 903 } 904 905 case IEEE80211_FC0_SUBTYPE_AUTH: 906 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 907 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 908 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 909 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 910 case IEEE80211_FC0_SUBTYPE_DEAUTH: 911 case IEEE80211_FC0_SUBTYPE_DISASSOC: 912 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 913 wh, NULL, "%s", "not handled"); 914 vap->iv_stats.is_rx_mgtdiscard++; 915 return; 916 917 default: 918 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 919 wh, "mgt", "subtype 0x%x not handled", subtype); 920 vap->iv_stats.is_rx_badsubtype++; 921 break; 922 } 923 } 924 #undef IEEE80211_VERIFY_LENGTH 925 #undef IEEE80211_VERIFY_ELEMENT 926 927 static void 928 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 929 int subtype, int rssi, int noise, uint32_t rstamp) 930 { 931 struct ieee80211vap *vap = ni->ni_vap; 932 struct ieee80211com *ic = ni->ni_ic; 933 934 /* 935 * Process management frames when scanning; useful for doing 936 * a site-survey. 937 */ 938 if (ic->ic_flags & IEEE80211_F_SCAN) 939 adhoc_recv_mgmt(ni, m0, subtype, rssi, noise, rstamp); 940 else 941 vap->iv_stats.is_rx_mgtdiscard++; 942 } 943