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 = ni->ni_vap; 124 125 if (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_vap(&ic->ic_sta, vap, 168 sta_leave, NULL); 169 /* fall thru... */ 170 case IEEE80211_S_INIT: 171 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && 172 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { 173 /* 174 * Already have a channel; bypass the 175 * scan and startup immediately. 176 */ 177 ieee80211_create_ibss(vap, 178 ieee80211_ht_adjust_channel(ic, 179 vap->iv_des_chan, vap->iv_flags_ht)); 180 break; 181 } 182 /* 183 * Initiate a scan. We can come here as a result 184 * of an IEEE80211_IOC_SCAN_REQ too in which case 185 * the vap will be marked with IEEE80211_FEXT_SCANREQ 186 * and the scan request parameters will be present 187 * in iv_scanreq. Otherwise we do the default. 188 */ 189 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { 190 ieee80211_check_scan(vap, 191 vap->iv_scanreq_flags, 192 vap->iv_scanreq_duration, 193 vap->iv_scanreq_mindwell, 194 vap->iv_scanreq_maxdwell, 195 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); 196 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; 197 } else 198 ieee80211_check_scan_current(vap); 199 break; 200 case IEEE80211_S_SCAN: 201 /* 202 * This can happen because of a change in state 203 * that requires a reset. Trigger a new scan 204 * unless we're in manual roaming mode in which 205 * case an application must issue an explicit request. 206 */ 207 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) 208 ieee80211_check_scan_current(vap); 209 break; 210 default: 211 goto invalid; 212 } 213 break; 214 case IEEE80211_S_RUN: 215 if (vap->iv_flags & IEEE80211_F_WPA) { 216 /* XXX validate prerequisites */ 217 } 218 switch (ostate) { 219 case IEEE80211_S_INIT: 220 /* 221 * Already have a channel; bypass the 222 * scan and startup immediately. 223 * Note that ieee80211_create_ibss will call 224 * back to do a RUN->RUN state change. 225 */ 226 ieee80211_create_ibss(vap, 227 ieee80211_ht_adjust_channel(ic, 228 ic->ic_curchan, vap->iv_flags_ht)); 229 /* NB: iv_bss is changed on return */ 230 ni = vap->iv_bss; 231 break; 232 case IEEE80211_S_SCAN: 233 #ifdef IEEE80211_DEBUG 234 if (ieee80211_msg_debug(vap)) { 235 ieee80211_note(vap, 236 "synchronized with %s ssid ", 237 ether_sprintf(ni->ni_bssid)); 238 ieee80211_print_essid(vap->iv_bss->ni_essid, 239 ni->ni_esslen); 240 /* XXX MCS/HT */ 241 printf(" channel %d start %uMb\n", 242 ieee80211_chan2ieee(ic, ic->ic_curchan), 243 IEEE80211_RATE2MBS(ni->ni_txrate)); 244 } 245 #endif 246 break; 247 case IEEE80211_S_RUN: /* IBSS merge */ 248 break; 249 default: 250 goto invalid; 251 } 252 /* 253 * When 802.1x is not in use mark the port authorized 254 * at this point so traffic can flow. 255 */ 256 if (ni->ni_authmode != IEEE80211_AUTH_8021X) 257 ieee80211_node_authorize(ni); 258 /* 259 * Fake association when joining an existing bss. 260 */ 261 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && 262 ic->ic_newassoc != NULL) 263 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); 264 break; 265 case IEEE80211_S_SLEEP: 266 vap->iv_sta_ps(vap, 0); 267 break; 268 default: 269 invalid: 270 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, 271 "%s: unexpected state transition %s -> %s\n", __func__, 272 ieee80211_state_name[ostate], ieee80211_state_name[nstate]); 273 break; 274 } 275 return 0; 276 } 277 278 /* 279 * Decide if a received management frame should be 280 * printed when debugging is enabled. This filters some 281 * of the less interesting frames that come frequently 282 * (e.g. beacons). 283 */ 284 static __inline int 285 doprint(struct ieee80211vap *vap, int subtype) 286 { 287 switch (subtype) { 288 case IEEE80211_FC0_SUBTYPE_BEACON: 289 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); 290 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 291 return 1; 292 } 293 return 1; 294 } 295 296 /* 297 * Process a received frame. The node associated with the sender 298 * should be supplied. If nothing was found in the node table then 299 * the caller is assumed to supply a reference to iv_bss instead. 300 * The RSSI and a timestamp are also supplied. The RSSI data is used 301 * during AP scanning to select a AP to associate with; it can have 302 * any units so long as values have consistent units and higher values 303 * mean ``better signal''. The receive timestamp is currently not used 304 * by the 802.11 layer. 305 */ 306 static int 307 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, 308 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 309 { 310 struct ieee80211vap *vap = ni->ni_vap; 311 struct ieee80211com *ic = ni->ni_ic; 312 struct ifnet *ifp = vap->iv_ifp; 313 struct ieee80211_frame *wh; 314 struct ieee80211_key *key; 315 struct ether_header *eh; 316 int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ 317 uint8_t dir, type, subtype, qos; 318 uint8_t *bssid; 319 int is_hw_decrypted = 0; 320 int has_decrypted = 0; 321 322 /* 323 * Some devices do hardware decryption all the way through 324 * to pretending the frame wasn't encrypted in the first place. 325 * So, tag it appropriately so it isn't discarded inappropriately. 326 */ 327 if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED)) 328 is_hw_decrypted = 1; 329 330 if (m->m_flags & M_AMPDU_MPDU) { 331 /* 332 * Fastpath for A-MPDU reorder q resubmission. Frames 333 * w/ M_AMPDU_MPDU marked have already passed through 334 * here but were received out of order and been held on 335 * the reorder queue. When resubmitted they are marked 336 * with the M_AMPDU_MPDU flag and we can bypass most of 337 * the normal processing. 338 */ 339 wh = mtod(m, struct ieee80211_frame *); 340 type = IEEE80211_FC0_TYPE_DATA; 341 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 342 subtype = IEEE80211_FC0_SUBTYPE_QOS; 343 hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ 344 goto resubmit_ampdu; 345 } 346 347 KASSERT(ni != NULL, ("null node")); 348 ni->ni_inact = ni->ni_inact_reload; 349 350 type = -1; /* undefined */ 351 352 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { 353 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 354 ni->ni_macaddr, NULL, 355 "too short (1): len %u", m->m_pkthdr.len); 356 vap->iv_stats.is_rx_tooshort++; 357 goto out; 358 } 359 /* 360 * Bit of a cheat here, we use a pointer for a 3-address 361 * frame format but don't reference fields past outside 362 * ieee80211_frame_min w/o first validating the data is 363 * present. 364 */ 365 wh = mtod(m, struct ieee80211_frame *); 366 367 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 368 IEEE80211_FC0_VERSION_0) { 369 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 370 ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", 371 wh->i_fc[0], wh->i_fc[1]); 372 vap->iv_stats.is_rx_badversion++; 373 goto err; 374 } 375 376 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; 377 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 378 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 379 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { 380 if (dir != IEEE80211_FC1_DIR_NODS) 381 bssid = wh->i_addr1; 382 else if (type == IEEE80211_FC0_TYPE_CTL) 383 bssid = wh->i_addr1; 384 else { 385 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 386 IEEE80211_DISCARD_MAC(vap, 387 IEEE80211_MSG_ANY, ni->ni_macaddr, 388 NULL, "too short (2): len %u", 389 m->m_pkthdr.len); 390 vap->iv_stats.is_rx_tooshort++; 391 goto out; 392 } 393 bssid = wh->i_addr3; 394 } 395 /* 396 * Validate the bssid. 397 */ 398 if (!(type == IEEE80211_FC0_TYPE_MGT && 399 (subtype == IEEE80211_FC0_SUBTYPE_BEACON || 400 subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) && 401 !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && 402 !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { 403 /* not interested in */ 404 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 405 bssid, NULL, "%s", "not to bss"); 406 vap->iv_stats.is_rx_wrongbss++; 407 goto out; 408 } 409 /* 410 * Data frame, cons up a node when it doesn't 411 * exist. This should probably done after an ACL check. 412 */ 413 if (type == IEEE80211_FC0_TYPE_DATA && 414 ni == vap->iv_bss && 415 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 416 /* 417 * Beware of frames that come in too early; we 418 * can receive broadcast frames and creating sta 419 * entries will blow up because there is no bss 420 * channel yet. 421 */ 422 if (vap->iv_state != IEEE80211_S_RUN) { 423 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 424 wh, "data", "not in RUN state (%s)", 425 ieee80211_state_name[vap->iv_state]); 426 vap->iv_stats.is_rx_badstate++; 427 goto err; 428 } 429 /* 430 * Fake up a node for this newly discovered member 431 * of the IBSS. 432 * 433 * Note: This doesn't "upgrade" the node to 11n; 434 * that will happen after a probe request/response 435 * exchange. 436 */ 437 ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); 438 if (ni == NULL) { 439 /* NB: stat kept for alloc failure */ 440 goto err; 441 } 442 } 443 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 444 ni->ni_noise = nf; 445 if (IEEE80211_HAS_SEQ(type, subtype) && 446 IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 447 uint8_t tid = ieee80211_gettid(wh); 448 if (IEEE80211_QOS_HAS_SEQ(wh) && 449 TID_TO_WME_AC(tid) >= WME_AC_VI) 450 ic->ic_wme.wme_hipri_traffic++; 451 if (! ieee80211_check_rxseq(ni, wh, bssid, rxs)) 452 goto out; 453 } 454 } 455 456 switch (type) { 457 case IEEE80211_FC0_TYPE_DATA: 458 hdrspace = ieee80211_hdrspace(ic, wh); 459 if (m->m_len < hdrspace && 460 (m = m_pullup(m, hdrspace)) == NULL) { 461 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 462 ni->ni_macaddr, NULL, 463 "data too short: expecting %u", hdrspace); 464 vap->iv_stats.is_rx_tooshort++; 465 goto out; /* XXX */ 466 } 467 if (dir != IEEE80211_FC1_DIR_NODS) { 468 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 469 wh, "data", "incorrect dir 0x%x", dir); 470 vap->iv_stats.is_rx_wrongdir++; 471 goto out; 472 } 473 /* XXX no power-save support */ 474 475 /* 476 * Handle A-MPDU re-ordering. If the frame is to be 477 * processed directly then ieee80211_ampdu_reorder 478 * will return 0; otherwise it has consumed the mbuf 479 * and we should do nothing more with it. 480 */ 481 if ((m->m_flags & M_AMPDU) && 482 ieee80211_ampdu_reorder(ni, m, rxs) != 0) { 483 m = NULL; 484 goto out; 485 } 486 resubmit_ampdu: 487 488 /* 489 * Handle privacy requirements. Note that we 490 * must not be preempted from here until after 491 * we (potentially) call ieee80211_crypto_demic; 492 * otherwise we may violate assumptions in the 493 * crypto cipher modules used to do delayed update 494 * of replay sequence numbers. 495 */ 496 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 497 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { 498 /* 499 * Discard encrypted frames when privacy is off. 500 */ 501 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 502 wh, "WEP", "%s", "PRIVACY off"); 503 vap->iv_stats.is_rx_noprivacy++; 504 IEEE80211_NODE_STAT(ni, rx_noprivacy); 505 goto out; 506 } 507 if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) { 508 /* NB: stats+msgs handled in crypto_decap */ 509 IEEE80211_NODE_STAT(ni, rx_wepfail); 510 goto out; 511 } 512 wh = mtod(m, struct ieee80211_frame *); 513 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED; 514 has_decrypted = 1; 515 } else { 516 /* XXX M_WEP and IEEE80211_F_PRIVACY */ 517 key = NULL; 518 } 519 520 /* 521 * Save QoS bits for use below--before we strip the header. 522 */ 523 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { 524 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? 525 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : 526 ((struct ieee80211_qosframe *)wh)->i_qos[0]; 527 } else 528 qos = 0; 529 530 /* 531 * Next up, any fragmentation. 532 */ 533 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { 534 m = ieee80211_defrag(ni, m, hdrspace); 535 if (m == NULL) { 536 /* Fragment dropped or frame not complete yet */ 537 goto out; 538 } 539 } 540 wh = NULL; /* no longer valid, catch any uses */ 541 542 /* 543 * Next strip any MSDU crypto bits. 544 */ 545 if (!ieee80211_crypto_demic(vap, key, m, 0)) { 546 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 547 ni->ni_macaddr, "data", "%s", "demic error"); 548 vap->iv_stats.is_rx_demicfail++; 549 IEEE80211_NODE_STAT(ni, rx_demicfail); 550 goto out; 551 } 552 553 /* copy to listener after decrypt */ 554 if (ieee80211_radiotap_active_vap(vap)) 555 ieee80211_radiotap_rx(vap, m); 556 need_tap = 0; 557 558 /* 559 * Finally, strip the 802.11 header. 560 */ 561 m = ieee80211_decap(vap, m, hdrspace); 562 if (m == NULL) { 563 /* XXX mask bit to check for both */ 564 /* don't count Null data frames as errors */ 565 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || 566 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) 567 goto out; 568 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 569 ni->ni_macaddr, "data", "%s", "decap error"); 570 vap->iv_stats.is_rx_decap++; 571 IEEE80211_NODE_STAT(ni, rx_decap); 572 goto err; 573 } 574 eh = mtod(m, struct ether_header *); 575 if (!ieee80211_node_is_authorized(ni)) { 576 /* 577 * Deny any non-PAE frames received prior to 578 * authorization. For open/shared-key 579 * authentication the port is mark authorized 580 * after authentication completes. For 802.1x 581 * the port is not marked authorized by the 582 * authenticator until the handshake has completed. 583 */ 584 if (eh->ether_type != htons(ETHERTYPE_PAE)) { 585 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, 586 eh->ether_shost, "data", 587 "unauthorized port: ether type 0x%x len %u", 588 eh->ether_type, m->m_pkthdr.len); 589 vap->iv_stats.is_rx_unauth++; 590 IEEE80211_NODE_STAT(ni, rx_unauth); 591 goto err; 592 } 593 } else { 594 /* 595 * When denying unencrypted frames, discard 596 * any non-PAE frames received without encryption. 597 */ 598 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && 599 ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) && 600 (is_hw_decrypted == 0) && 601 eh->ether_type != htons(ETHERTYPE_PAE)) { 602 /* 603 * Drop unencrypted frames. 604 */ 605 vap->iv_stats.is_rx_unencrypted++; 606 IEEE80211_NODE_STAT(ni, rx_unencrypted); 607 goto out; 608 } 609 } 610 /* XXX require HT? */ 611 if (qos & IEEE80211_QOS_AMSDU) { 612 m = ieee80211_decap_amsdu(ni, m); 613 if (m == NULL) 614 return IEEE80211_FC0_TYPE_DATA; 615 } else { 616 #ifdef IEEE80211_SUPPORT_SUPERG 617 m = ieee80211_decap_fastframe(vap, ni, m); 618 if (m == NULL) 619 return IEEE80211_FC0_TYPE_DATA; 620 #endif 621 } 622 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) 623 ieee80211_deliver_data(ni->ni_wdsvap, ni, m); 624 else 625 ieee80211_deliver_data(vap, ni, m); 626 return IEEE80211_FC0_TYPE_DATA; 627 628 case IEEE80211_FC0_TYPE_MGT: 629 vap->iv_stats.is_rx_mgmt++; 630 IEEE80211_NODE_STAT(ni, rx_mgmt); 631 if (dir != IEEE80211_FC1_DIR_NODS) { 632 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 633 wh, "data", "incorrect dir 0x%x", dir); 634 vap->iv_stats.is_rx_wrongdir++; 635 goto err; 636 } 637 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { 638 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 639 ni->ni_macaddr, "mgt", "too short: len %u", 640 m->m_pkthdr.len); 641 vap->iv_stats.is_rx_tooshort++; 642 goto out; 643 } 644 #ifdef IEEE80211_DEBUG 645 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || 646 ieee80211_msg_dumppkts(vap)) { 647 if_printf(ifp, "received %s from %s rssi %d\n", 648 ieee80211_mgt_subtype_name(subtype), 649 ether_sprintf(wh->i_addr2), rssi); 650 } 651 #endif 652 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) { 653 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 654 wh, NULL, "%s", "WEP set but not permitted"); 655 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ 656 goto out; 657 } 658 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf); 659 goto out; 660 661 case IEEE80211_FC0_TYPE_CTL: 662 vap->iv_stats.is_rx_ctl++; 663 IEEE80211_NODE_STAT(ni, rx_ctrl); 664 vap->iv_recv_ctl(ni, m, subtype); 665 goto out; 666 667 default: 668 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 669 wh, "bad", "frame type 0x%x", type); 670 /* should not come here */ 671 break; 672 } 673 err: 674 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 675 out: 676 if (m != NULL) { 677 if (need_tap && ieee80211_radiotap_active_vap(vap)) 678 ieee80211_radiotap_rx(vap, m); 679 m_freem(m); 680 } 681 return type; 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, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 704 { 705 struct ieee80211vap *vap = ni->ni_vap; 706 struct ieee80211com *ic = ni->ni_ic; 707 struct ieee80211_channel *rxchan = ic->ic_curchan; 708 struct ieee80211_frame *wh; 709 uint8_t *frm, *efrm; 710 uint8_t *ssid, *rates, *xrates; 711 #if 0 712 int ht_state_change = 0; 713 #endif 714 715 wh = mtod(m0, struct ieee80211_frame *); 716 frm = (uint8_t *)&wh[1]; 717 efrm = mtod(m0, uint8_t *) + m0->m_len; 718 switch (subtype) { 719 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 720 case IEEE80211_FC0_SUBTYPE_BEACON: { 721 struct ieee80211_scanparams scan; 722 struct ieee80211_channel *c; 723 /* 724 * We process beacon/probe response 725 * frames to discover neighbors. 726 */ 727 if (rxs != NULL) { 728 c = ieee80211_lookup_channel_rxstatus(vap, rxs); 729 if (c != NULL) 730 rxchan = c; 731 } 732 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) 733 return; 734 /* 735 * Count frame now that we know it's to be processed. 736 */ 737 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { 738 vap->iv_stats.is_rx_beacon++; /* XXX remove */ 739 IEEE80211_NODE_STAT(ni, rx_beacons); 740 } else 741 IEEE80211_NODE_STAT(ni, rx_proberesp); 742 /* 743 * If scanning, just pass information to the scan module. 744 */ 745 if (ic->ic_flags & IEEE80211_F_SCAN) { 746 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { 747 /* 748 * Actively scanning a channel marked passive; 749 * send a probe request now that we know there 750 * is 802.11 traffic present. 751 * 752 * XXX check if the beacon we recv'd gives 753 * us what we need and suppress the probe req 754 */ 755 ieee80211_probe_curchan(vap, 1); 756 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; 757 } 758 ieee80211_add_scan(vap, rxchan, &scan, wh, 759 subtype, rssi, nf); 760 return; 761 } 762 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { 763 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 764 /* 765 * Create a new entry in the neighbor table. 766 * 767 * XXX TODO: 768 * 769 * Here we're not scanning; so if we have an 770 * SSID then make sure it matches our SSID. 771 * Otherwise this code will match on all IBSS 772 * beacons/probe requests for all SSIDs, 773 * filling the node table with nodes that 774 * aren't ours. 775 */ 776 if (ieee80211_ibss_node_check_new(ni, &scan)) { 777 ni = ieee80211_add_neighbor(vap, wh, &scan); 778 /* 779 * Send a probe request so we announce 11n 780 * capabilities. 781 */ 782 ieee80211_send_probereq(ni, /* node */ 783 vap->iv_myaddr, /* SA */ 784 ni->ni_macaddr, /* DA */ 785 vap->iv_bss->ni_bssid, /* BSSID */ 786 vap->iv_bss->ni_essid, 787 vap->iv_bss->ni_esslen); /* SSID */ 788 } else 789 ni = NULL; 790 791 } else if (ni->ni_capinfo == 0) { 792 /* 793 * Update faked node created on transmit. 794 * Note this also updates the tsf. 795 */ 796 ieee80211_init_neighbor(ni, wh, &scan); 797 798 /* 799 * Send a probe request so we announce 11n 800 * capabilities. 801 */ 802 ieee80211_send_probereq(ni, /* node */ 803 vap->iv_myaddr, /* SA */ 804 ni->ni_macaddr, /* DA */ 805 vap->iv_bss->ni_bssid, /* BSSID */ 806 vap->iv_bss->ni_essid, 807 vap->iv_bss->ni_esslen); /* SSID */ 808 } else { 809 /* 810 * Record tsf for potential resync. 811 */ 812 memcpy(ni->ni_tstamp.data, scan.tstamp, 813 sizeof(ni->ni_tstamp)); 814 } 815 /* 816 * This isn't enabled yet - otherwise it would 817 * update the HT parameters and channel width 818 * from any node, which could lead to lots of 819 * strange behaviour if the 11n nodes aren't 820 * exactly configured to match. 821 */ 822 #if 0 823 if (scan.htcap != NULL && scan.htinfo != NULL && 824 (vap->iv_flags_ht & IEEE80211_FHT_HT)) { 825 ieee80211_ht_updateparams(ni, 826 scan.htcap, scan.htinfo)); 827 if (ieee80211_ht_updateparams_final(ni, 828 scan.htcap, scan.htinfo)) 829 ht_state_change = 1; 830 } 831 832 /* XXX same for VHT? */ 833 #endif 834 if (ni != NULL) { 835 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); 836 ni->ni_noise = nf; 837 } 838 /* 839 * Same here - the channel width change should 840 * be applied to the specific peer node, not 841 * to the ic. Ie, the interface configuration 842 * should stay in its current channel width; 843 * but it should change the rate control and 844 * any queued frames for the given node only. 845 * 846 * Since there's no (current) way to inform 847 * the driver that a channel width change has 848 * occurred for a single node, just stub this 849 * out. 850 */ 851 #if 0 852 if (ht_state_change) 853 ieee80211_update_chw(ic); 854 #endif 855 } 856 break; 857 } 858 859 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 860 if (vap->iv_state != IEEE80211_S_RUN) { 861 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 862 wh, NULL, "wrong state %s", 863 ieee80211_state_name[vap->iv_state]); 864 vap->iv_stats.is_rx_mgtdiscard++; 865 return; 866 } 867 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { 868 /* frame must be directed */ 869 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 870 wh, NULL, "%s", "not unicast"); 871 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ 872 return; 873 } 874 875 /* 876 * prreq frame format 877 * [tlv] ssid 878 * [tlv] supported rates 879 * [tlv] extended supported rates 880 */ 881 ssid = rates = xrates = NULL; 882 while (efrm - frm > 1) { 883 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 884 switch (*frm) { 885 case IEEE80211_ELEMID_SSID: 886 ssid = frm; 887 break; 888 case IEEE80211_ELEMID_RATES: 889 rates = frm; 890 break; 891 case IEEE80211_ELEMID_XRATES: 892 xrates = frm; 893 break; 894 } 895 frm += frm[1] + 2; 896 } 897 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); 898 if (xrates != NULL) 899 IEEE80211_VERIFY_ELEMENT(xrates, 900 IEEE80211_RATE_MAXSIZE - rates[1], return); 901 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); 902 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); 903 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { 904 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 905 wh, NULL, 906 "%s", "no ssid with ssid suppression enabled"); 907 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ 908 return; 909 } 910 911 /* XXX find a better class or define it's own */ 912 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, 913 "%s", "recv probe req"); 914 /* 915 * Some legacy 11b clients cannot hack a complete 916 * probe response frame. When the request includes 917 * only a bare-bones rate set, communicate this to 918 * the transmit side. 919 */ 920 ieee80211_send_proberesp(vap, wh->i_addr2, 921 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); 922 923 /* 924 * Note: we don't benefit from stashing the probe request 925 * IEs away to use for IBSS negotiation, because we 926 * typically don't get all of the IEs. 927 */ 928 break; 929 930 case IEEE80211_FC0_SUBTYPE_ACTION: 931 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 932 if ((ni == vap->iv_bss) && 933 !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { 934 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 935 wh, NULL, "%s", "unknown node"); 936 vap->iv_stats.is_rx_mgtdiscard++; 937 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) && 938 !IEEE80211_IS_MULTICAST(wh->i_addr1)) { 939 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 940 wh, NULL, "%s", "not for us"); 941 vap->iv_stats.is_rx_mgtdiscard++; 942 } else if (vap->iv_state != IEEE80211_S_RUN) { 943 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 944 wh, NULL, "wrong state %s", 945 ieee80211_state_name[vap->iv_state]); 946 vap->iv_stats.is_rx_mgtdiscard++; 947 } else { 948 if (ieee80211_parse_action(ni, m0) == 0) 949 (void)ic->ic_recv_action(ni, wh, frm, efrm); 950 } 951 break; 952 953 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 954 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 955 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 956 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 957 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 958 case IEEE80211_FC0_SUBTYPE_ATIM: 959 case IEEE80211_FC0_SUBTYPE_DISASSOC: 960 case IEEE80211_FC0_SUBTYPE_AUTH: 961 case IEEE80211_FC0_SUBTYPE_DEAUTH: 962 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 963 wh, NULL, "%s", "not handled"); 964 vap->iv_stats.is_rx_mgtdiscard++; 965 break; 966 967 default: 968 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 969 wh, "mgt", "subtype 0x%x not handled", subtype); 970 vap->iv_stats.is_rx_badsubtype++; 971 break; 972 } 973 } 974 #undef IEEE80211_VERIFY_LENGTH 975 #undef IEEE80211_VERIFY_ELEMENT 976 977 static void 978 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, 979 int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf) 980 { 981 struct ieee80211vap *vap = ni->ni_vap; 982 struct ieee80211com *ic = ni->ni_ic; 983 struct ieee80211_frame *wh; 984 985 /* 986 * Process management frames when scanning; useful for doing 987 * a site-survey. 988 */ 989 if (ic->ic_flags & IEEE80211_F_SCAN) 990 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf); 991 else { 992 wh = mtod(m0, struct ieee80211_frame *); 993 switch (subtype) { 994 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 995 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 996 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 997 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 998 case IEEE80211_FC0_SUBTYPE_PROBE_REQ: 999 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1000 case IEEE80211_FC0_SUBTYPE_TIMING_ADV: 1001 case IEEE80211_FC0_SUBTYPE_BEACON: 1002 case IEEE80211_FC0_SUBTYPE_ATIM: 1003 case IEEE80211_FC0_SUBTYPE_DISASSOC: 1004 case IEEE80211_FC0_SUBTYPE_AUTH: 1005 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1006 case IEEE80211_FC0_SUBTYPE_ACTION: 1007 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK: 1008 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, 1009 wh, NULL, "%s", "not handled"); 1010 vap->iv_stats.is_rx_mgtdiscard++; 1011 break; 1012 default: 1013 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, 1014 wh, "mgt", "subtype 0x%x not handled", subtype); 1015 vap->iv_stats.is_rx_badsubtype++; 1016 break; 1017 } 1018 } 1019 } 1020 1021 static void 1022 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype) 1023 { 1024 1025 switch (subtype) { 1026 case IEEE80211_FC0_SUBTYPE_BAR: 1027 ieee80211_recv_bar(ni, m); 1028 break; 1029 } 1030 } 1031