sys/net80211/ieee80211_adhoc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifdef __FreeBSD__
  30 __FBSDID("$FreeBSD$");
  31 #endif
  32
  33 /*
  34  * IEEE 802.11 IBSS mode support.
  35  */
  36 #include "opt_inet.h"
  37 #include "opt_wlan.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/malloc.h>
  43 #include <sys/kernel.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/sockio.h>
  47 #include <sys/endian.h>
  48 #include <sys/errno.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_var.h>
  54 #include <net/if_media.h>
  55 #include <net/if_llc.h>
  56 #include <net/ethernet.h>
  57
  58 #include <net/bpf.h>
  59
  60 #include <net80211/ieee80211_var.h>
  61 #include <net80211/ieee80211_adhoc.h>
  62 #include <net80211/ieee80211_input.h>
  63 #ifdef IEEE80211_SUPPORT_SUPERG
  64 #include <net80211/ieee80211_superg.h>
  65 #endif
  66 #ifdef IEEE80211_SUPPORT_TDMA
  67 #include <net80211/ieee80211_tdma.h>
  68 #endif
  69 #include <net80211/ieee80211_sta.h>
  70
  71 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  72
  73 static  void adhoc_vattach(struct ieee80211vap *);
  74 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  75 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
  76             const struct ieee80211_rx_stats *, int, int);
  77 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  78         int subtype, const struct ieee80211_rx_stats *, int, int);
  79 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  80             int subtype, const struct ieee80211_rx_stats *rxs, int, int);
  81 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  82
  83 void
  84 ieee80211_adhoc_attach(struct ieee80211com *ic)
  85 {
  86         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  87         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  88 }
  89
  90 void
  91 ieee80211_adhoc_detach(struct ieee80211com *ic)
  92 {
  93 }
  94
  95 static void
  96 adhoc_vdetach(struct ieee80211vap *vap)
  97 {
  98 }
  99
 100 static void
 101 adhoc_vattach(struct ieee80211vap *vap)
 102 {
 103         vap->iv_newstate = adhoc_newstate;
 104         vap->iv_input = adhoc_input;
 105         if (vap->iv_opmode == IEEE80211_M_IBSS)
 106                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 107         else
 108                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 109         vap->iv_recv_ctl = adhoc_recv_ctl;
 110         vap->iv_opdetach = adhoc_vdetach;
 111 #ifdef IEEE80211_SUPPORT_TDMA
 112         /*
 113          * Throw control to tdma support.  Note we do this
 114          * after setting up our callbacks so it can piggyback
 115          * on top of us.
 116          */
 117         if (vap->iv_caps & IEEE80211_C_TDMA)
 118                 ieee80211_tdma_vattach(vap);
 119 #endif
 120 }
 121
 122 static void
 123 sta_leave(void *arg, struct ieee80211_node *ni)
 124 {
 125         struct ieee80211vap *vap = ni->ni_vap;
 126
 127         if (ni != vap->iv_bss)
 128                 ieee80211_node_leave(ni);
 129 }
 130
 131 /*
 132  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 133  */
 134 static int
 135 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 136 {
 137         struct ieee80211com *ic = vap->iv_ic;
 138         struct ieee80211_node *ni;
 139         enum ieee80211_state ostate;
 140
 141         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 142
 143         ostate = vap->iv_state;
 144         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 145             __func__, ieee80211_state_name[ostate],
 146             ieee80211_state_name[nstate], arg);
 147         vap->iv_state = nstate;                 /* state transition */
 148         if (ostate != IEEE80211_S_SCAN)
 149                 ieee80211_cancel_scan(vap);     /* background scan */
 150         ni = vap->iv_bss;                       /* NB: no reference held */
 151         switch (nstate) {
 152         case IEEE80211_S_INIT:
 153                 switch (ostate) {
 154                 case IEEE80211_S_SCAN:
 155                         ieee80211_cancel_scan(vap);
 156                         break;
 157                 default:
 158                         break;
 159                 }
 160                 if (ostate != IEEE80211_S_INIT) {
 161                         /* NB: optimize INIT -> INIT case */
 162                         ieee80211_reset_bss(vap);
 163                 }
 164                 break;
 165         case IEEE80211_S_SCAN:
 166                 switch (ostate) {
 167                 case IEEE80211_S_RUN:           /* beacon miss */
 168                         /* purge station table; entries are stale */
 169                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 170                             sta_leave, NULL);
 171                         /* fall thru... */
 172                 case IEEE80211_S_INIT:
 173                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 174                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 175                                 /*
 176                                  * Already have a channel; bypass the
 177                                  * scan and startup immediately.
 178                                  */
 179                                 ieee80211_create_ibss(vap,
 180                                     ieee80211_ht_adjust_channel(ic,
 181                                     vap->iv_des_chan, vap->iv_flags_ht));
 182                                 break;
 183                         }
 184                         /*
 185                          * Initiate a scan.  We can come here as a result
 186                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 187                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 188                          * and the scan request parameters will be present
 189                          * in iv_scanreq.  Otherwise we do the default.
 190                          */
 191                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 192                                 ieee80211_check_scan(vap,
 193                                     vap->iv_scanreq_flags,
 194                                     vap->iv_scanreq_duration,
 195                                     vap->iv_scanreq_mindwell,
 196                                     vap->iv_scanreq_maxdwell,
 197                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 198                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 199                         } else
 200                                 ieee80211_check_scan_current(vap);
 201                         break;
 202                 case IEEE80211_S_SCAN:
 203                         /*
 204                          * This can happen because of a change in state
 205                          * that requires a reset.  Trigger a new scan
 206                          * unless we're in manual roaming mode in which
 207                          * case an application must issue an explicit request.
 208                          */
 209                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 210                                 ieee80211_check_scan_current(vap);
 211                         break;
 212                 default:
 213                         goto invalid;
 214                 }
 215                 break;
 216         case IEEE80211_S_RUN:
 217                 if (vap->iv_flags & IEEE80211_F_WPA) {
 218                         /* XXX validate prerequisites */
 219                 }
 220                 switch (ostate) {
 221                 case IEEE80211_S_INIT:
 222                         /*
 223                          * Already have a channel; bypass the
 224                          * scan and startup immediately.
 225                          * Note that ieee80211_create_ibss will call
 226                          * back to do a RUN->RUN state change.
 227                          */
 228                         ieee80211_create_ibss(vap,
 229                             ieee80211_ht_adjust_channel(ic,
 230                                 ic->ic_curchan, vap->iv_flags_ht));
 231                         /* NB: iv_bss is changed on return */
 232                         ni = vap->iv_bss;
 233                         break;
 234                 case IEEE80211_S_SCAN:
 235 #ifdef IEEE80211_DEBUG
 236                         if (ieee80211_msg_debug(vap)) {
 237                                 ieee80211_note(vap,
 238                                     "synchronized with %s ssid ",
 239                                     ether_sprintf(ni->ni_bssid));
 240                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 241                                     ni->ni_esslen);
 242                                 /* XXX MCS/HT */
 243                                 printf(" channel %d start %uMb\n",
 244                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 245                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 246                         }
 247 #endif
 248                         break;
 249                 case IEEE80211_S_RUN:   /* IBSS merge */
 250                         break;
 251                 default:
 252                         goto invalid;
 253                 }
 254                 /*
 255                  * When 802.1x is not in use mark the port authorized
 256                  * at this point so traffic can flow.
 257                  */
 258                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 259                         ieee80211_node_authorize(ni);
 260                 /*
 261                  * Fake association when joining an existing bss.
 262                  */
 263                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 264                     ic->ic_newassoc != NULL)
 265                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 266                 break;
 267         case IEEE80211_S_SLEEP:
 268                 vap->iv_sta_ps(vap, 0);
 269                 break;
 270         default:
 271         invalid:
 272                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 273                     "%s: unexpected state transition %s -> %s\n", __func__,
 274                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 275                 break;
 276         }
 277         return 0;
 278 }
 279
 280 /*
 281  * Decide if a received management frame should be
 282  * printed when debugging is enabled.  This filters some
 283  * of the less interesting frames that come frequently
 284  * (e.g. beacons).
 285  */
 286 static __inline int
 287 doprint(struct ieee80211vap *vap, int subtype)
 288 {
 289         switch (subtype) {
 290         case IEEE80211_FC0_SUBTYPE_BEACON:
 291                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 292         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 293                 return 1;
 294         }
 295         return 1;
 296 }
 297
 298 /*
 299  * Process a received frame.  The node associated with the sender
 300  * should be supplied.  If nothing was found in the node table then
 301  * the caller is assumed to supply a reference to iv_bss instead.
 302  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 303  * during AP scanning to select a AP to associate with; it can have
 304  * any units so long as values have consistent units and higher values
 305  * mean ``better signal''.  The receive timestamp is currently not used
 306  * by the 802.11 layer.
 307  */
 308 static int
 309 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
 310     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 311 {
 312         struct ieee80211vap *vap = ni->ni_vap;
 313         struct ieee80211com *ic = ni->ni_ic;
 314         struct ifnet *ifp = vap->iv_ifp;
 315         struct ieee80211_frame *wh;
 316         struct ieee80211_key *key;
 317         struct ether_header *eh;
 318         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 319         uint8_t dir, type, subtype, qos;
 320         uint8_t *bssid;
 321         int is_hw_decrypted = 0;
 322         int has_decrypted = 0;
 323
 324         /*
 325          * Some devices do hardware decryption all the way through
 326          * to pretending the frame wasn't encrypted in the first place.
 327          * So, tag it appropriately so it isn't discarded inappropriately.
 328          */
 329         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 330                 is_hw_decrypted = 1;
 331
 332         if (m->m_flags & M_AMPDU_MPDU) {
 333                 /*
 334                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 335                  * w/ M_AMPDU_MPDU marked have already passed through
 336                  * here but were received out of order and been held on
 337                  * the reorder queue.  When resubmitted they are marked
 338                  * with the M_AMPDU_MPDU flag and we can bypass most of
 339                  * the normal processing.
 340                  */
 341                 wh = mtod(m, struct ieee80211_frame *);
 342                 type = IEEE80211_FC0_TYPE_DATA;
 343                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 344                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 345                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 346                 goto resubmit_ampdu;
 347         }
 348
 349         KASSERT(ni != NULL, ("null node"));
 350         ni->ni_inact = ni->ni_inact_reload;
 351
 352         type = -1;                      /* undefined */
 353
 354         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 355                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 356                     ni->ni_macaddr, NULL,
 357                     "too short (1): len %u", m->m_pkthdr.len);
 358                 vap->iv_stats.is_rx_tooshort++;
 359                 goto out;
 360         }
 361         /*
 362          * Bit of a cheat here, we use a pointer for a 3-address
 363          * frame format but don't reference fields past outside
 364          * ieee80211_frame_min w/o first validating the data is
 365          * present.
 366          */
 367         wh = mtod(m, struct ieee80211_frame *);
 368
 369         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 370             IEEE80211_FC0_VERSION_0) {
 371                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 372                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 373                     wh->i_fc[0], wh->i_fc[1]);
 374                 vap->iv_stats.is_rx_badversion++;
 375                 goto err;
 376         }
 377
 378         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 379         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 380         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 381         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 382                 if (dir != IEEE80211_FC1_DIR_NODS)
 383                         bssid = wh->i_addr1;
 384                 else if (type == IEEE80211_FC0_TYPE_CTL)
 385                         bssid = wh->i_addr1;
 386                 else {
 387                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 388                                 IEEE80211_DISCARD_MAC(vap,
 389                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 390                                     NULL, "too short (2): len %u",
 391                                     m->m_pkthdr.len);
 392                                 vap->iv_stats.is_rx_tooshort++;
 393                                 goto out;
 394                         }
 395                         bssid = wh->i_addr3;
 396                 }
 397                 /*
 398                  * Validate the bssid.
 399                  */
 400                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 401                      (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
 402                       subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
 403                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 404                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 405                         /* not interested in */
 406                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 407                             bssid, NULL, "%s", "not to bss");
 408                         vap->iv_stats.is_rx_wrongbss++;
 409                         goto out;
 410                 }
 411                 /*
 412                  * Data frame, cons up a node when it doesn't
 413                  * exist. This should probably done after an ACL check.
 414                  */
 415                 if (type == IEEE80211_FC0_TYPE_DATA &&
 416                     ni == vap->iv_bss &&
 417                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 418                         /*
 419                          * Beware of frames that come in too early; we
 420                          * can receive broadcast frames and creating sta
 421                          * entries will blow up because there is no bss
 422                          * channel yet.
 423                          */
 424                         if (vap->iv_state != IEEE80211_S_RUN) {
 425                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 426                                     wh, "data", "not in RUN state (%s)",
 427                                     ieee80211_state_name[vap->iv_state]);
 428                                 vap->iv_stats.is_rx_badstate++;
 429                                 goto err;
 430                         }
 431                         /*
 432                          * Fake up a node for this newly discovered member
 433                          * of the IBSS.
 434                          *
 435                          * Note: This doesn't "upgrade" the node to 11n;
 436                          * that will happen after a probe request/response
 437                          * exchange.
 438                          */
 439                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 440                         if (ni == NULL) {
 441                                 /* NB: stat kept for alloc failure */
 442                                 goto err;
 443                         }
 444                 }
 445                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 446                 ni->ni_noise = nf;
 447                 if (IEEE80211_HAS_SEQ(type, subtype) &&
 448                     IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 449                         uint8_t tid = ieee80211_gettid(wh);
 450                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 451                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 452                                 ic->ic_wme.wme_hipri_traffic++;
 453                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 454                                 goto out;
 455                 }
 456         }
 457
 458         switch (type) {
 459         case IEEE80211_FC0_TYPE_DATA:
 460                 hdrspace = ieee80211_hdrspace(ic, wh);
 461                 if (m->m_len < hdrspace &&
 462                     (m = m_pullup(m, hdrspace)) == NULL) {
 463                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 464                             ni->ni_macaddr, NULL,
 465                             "data too short: expecting %u", hdrspace);
 466                         vap->iv_stats.is_rx_tooshort++;
 467                         goto out;               /* XXX */
 468                 }
 469                 if (dir != IEEE80211_FC1_DIR_NODS) {
 470                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 471                             wh, "data", "incorrect dir 0x%x", dir);
 472                         vap->iv_stats.is_rx_wrongdir++;
 473                         goto out;
 474                 }
 475                 /* XXX no power-save support */
 476
 477                 /*
 478                  * Handle A-MPDU re-ordering.  If the frame is to be
 479                  * processed directly then ieee80211_ampdu_reorder
 480                  * will return 0; otherwise it has consumed the mbuf
 481                  * and we should do nothing more with it.
 482                  */
 483                 if ((m->m_flags & M_AMPDU) &&
 484                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 485                         m = NULL;
 486                         goto out;
 487                 }
 488         resubmit_ampdu:
 489
 490                 /*
 491                  * Handle privacy requirements.  Note that we
 492                  * must not be preempted from here until after
 493                  * we (potentially) call ieee80211_crypto_demic;
 494                  * otherwise we may violate assumptions in the
 495                  * crypto cipher modules used to do delayed update
 496                  * of replay sequence numbers.
 497                  */
 498                 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 499                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 500                                 /*
 501                                  * Discard encrypted frames when privacy is off.
 502                                  */
 503                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 504                                     wh, "WEP", "%s", "PRIVACY off");
 505                                 vap->iv_stats.is_rx_noprivacy++;
 506                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 507                                 goto out;
 508                         }
 509                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 510                                 /* NB: stats+msgs handled in crypto_decap */
 511                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 512                                 goto out;
 513                         }
 514                         wh = mtod(m, struct ieee80211_frame *);
 515                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 516                         has_decrypted = 1;
 517                 } else {
 518                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 519                         key = NULL;
 520                 }
 521
 522                 /*
 523                  * Save QoS bits for use below--before we strip the header.
 524                  */
 525                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 526                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 527                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 528                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 529                 } else
 530                         qos = 0;
 531
 532                 /*
 533                  * Next up, any fragmentation.
 534                  */
 535                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 536                         m = ieee80211_defrag(ni, m, hdrspace);
 537                         if (m == NULL) {
 538                                 /* Fragment dropped or frame not complete yet */
 539                                 goto out;
 540                         }
 541                 }
 542                 wh = NULL;              /* no longer valid, catch any uses */
 543
 544                 /*
 545                  * Next strip any MSDU crypto bits.
 546                  */
 547                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 548                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 549                             ni->ni_macaddr, "data", "%s", "demic error");
 550                         vap->iv_stats.is_rx_demicfail++;
 551                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 552                         goto out;
 553                 }
 554
 555                 /* copy to listener after decrypt */
 556                 if (ieee80211_radiotap_active_vap(vap))
 557                         ieee80211_radiotap_rx(vap, m);
 558                 need_tap = 0;
 559
 560                 /*
 561                  * Finally, strip the 802.11 header.
 562                  */
 563                 m = ieee80211_decap(vap, m, hdrspace);
 564                 if (m == NULL) {
 565                         /* XXX mask bit to check for both */
 566                         /* don't count Null data frames as errors */
 567                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 568                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 569                                 goto out;
 570                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 571                             ni->ni_macaddr, "data", "%s", "decap error");
 572                         vap->iv_stats.is_rx_decap++;
 573                         IEEE80211_NODE_STAT(ni, rx_decap);
 574                         goto err;
 575                 }
 576                 eh = mtod(m, struct ether_header *);
 577                 if (!ieee80211_node_is_authorized(ni)) {
 578                         /*
 579                          * Deny any non-PAE frames received prior to
 580                          * authorization.  For open/shared-key
 581                          * authentication the port is mark authorized
 582                          * after authentication completes.  For 802.1x
 583                          * the port is not marked authorized by the
 584                          * authenticator until the handshake has completed.
 585                          */
 586                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 587                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 588                                     eh->ether_shost, "data",
 589                                     "unauthorized port: ether type 0x%x len %u",
 590                                     eh->ether_type, m->m_pkthdr.len);
 591                                 vap->iv_stats.is_rx_unauth++;
 592                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 593                                 goto err;
 594                         }
 595                 } else {
 596                         /*
 597                          * When denying unencrypted frames, discard
 598                          * any non-PAE frames received without encryption.
 599                          */
 600                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 601                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 602                             (is_hw_decrypted == 0) &&
 603                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 604                                 /*
 605                                  * Drop unencrypted frames.
 606                                  */
 607                                 vap->iv_stats.is_rx_unencrypted++;
 608                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 609                                 goto out;
 610                         }
 611                 }
 612                 /* XXX require HT? */
 613                 if (qos & IEEE80211_QOS_AMSDU) {
 614                         m = ieee80211_decap_amsdu(ni, m);
 615                         if (m == NULL)
 616                                 return IEEE80211_FC0_TYPE_DATA;
 617                 } else {
 618 #ifdef IEEE80211_SUPPORT_SUPERG
 619                         m = ieee80211_decap_fastframe(vap, ni, m);
 620                         if (m == NULL)
 621                                 return IEEE80211_FC0_TYPE_DATA;
 622 #endif
 623                 }
 624                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 625                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 626                 else
 627                         ieee80211_deliver_data(vap, ni, m);
 628                 return IEEE80211_FC0_TYPE_DATA;
 629
 630         case IEEE80211_FC0_TYPE_MGT:
 631                 vap->iv_stats.is_rx_mgmt++;
 632                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 633                 if (dir != IEEE80211_FC1_DIR_NODS) {
 634                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 635                             wh, "data", "incorrect dir 0x%x", dir);
 636                         vap->iv_stats.is_rx_wrongdir++;
 637                         goto err;
 638                 }
 639                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 640                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 641                             ni->ni_macaddr, "mgt", "too short: len %u",
 642                             m->m_pkthdr.len);
 643                         vap->iv_stats.is_rx_tooshort++;
 644                         goto out;
 645                 }
 646 #ifdef IEEE80211_DEBUG
 647                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 648                     ieee80211_msg_dumppkts(vap)) {
 649                         if_printf(ifp, "received %s from %s rssi %d\n",
 650                             ieee80211_mgt_subtype_name(subtype),
 651                             ether_sprintf(wh->i_addr2), rssi);
 652                 }
 653 #endif
 654                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 655                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 656                             wh, NULL, "%s", "WEP set but not permitted");
 657                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 658                         goto out;
 659                 }
 660                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 661                 goto out;
 662
 663         case IEEE80211_FC0_TYPE_CTL:
 664                 vap->iv_stats.is_rx_ctl++;
 665                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 666                 vap->iv_recv_ctl(ni, m, subtype);
 667                 goto out;
 668
 669         default:
 670                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 671                     wh, "bad", "frame type 0x%x", type);
 672                 /* should not come here */
 673                 break;
 674         }
 675 err:
 676         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 677 out:
 678         if (m != NULL) {
 679                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 680                         ieee80211_radiotap_rx(vap, m);
 681                 m_freem(m);
 682         }
 683         return type;
 684 }
 685
 686 static int
 687 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 688 {
 689         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 690         int i;
 691
 692         /* NB: the 11b clients we care about will not have xrates */
 693         if (xrates != NULL || rates == NULL)
 694                 return 0;
 695         for (i = 0; i < rates[1]; i++) {
 696                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 697                 if (r > 2*11 || ((1<<r) & brates) == 0)
 698                         return 0;
 699         }
 700         return 1;
 701 }
 702
 703 static void
 704 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 705         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 706 {
 707         struct ieee80211vap *vap = ni->ni_vap;
 708         struct ieee80211com *ic = ni->ni_ic;
 709         struct ieee80211_channel *rxchan = ic->ic_curchan;
 710         struct ieee80211_frame *wh;
 711         uint8_t *frm, *efrm;
 712         uint8_t *ssid, *rates, *xrates;
 713 #if 0
 714         int ht_state_change = 0;
 715 #endif
 716
 717         wh = mtod(m0, struct ieee80211_frame *);
 718         frm = (uint8_t *)&wh[1];
 719         efrm = mtod(m0, uint8_t *) + m0->m_len;
 720         switch (subtype) {
 721         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 722         case IEEE80211_FC0_SUBTYPE_BEACON: {
 723                 struct ieee80211_scanparams scan;
 724                 struct ieee80211_channel *c;
 725                 /*
 726                  * We process beacon/probe response
 727                  * frames to discover neighbors.
 728                  */
 729                 if (rxs != NULL) {
 730                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
 731                         if (c != NULL)
 732                                 rxchan = c;
 733                 }
 734                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
 735                         return;
 736                 /*
 737                  * Count frame now that we know it's to be processed.
 738                  */
 739                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 740                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 741                         IEEE80211_NODE_STAT(ni, rx_beacons);
 742                 } else
 743                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 744                 /*
 745                  * If scanning, just pass information to the scan module.
 746                  */
 747                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 748                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 749                                 /*
 750                                  * Actively scanning a channel marked passive;
 751                                  * send a probe request now that we know there
 752                                  * is 802.11 traffic present.
 753                                  *
 754                                  * XXX check if the beacon we recv'd gives
 755                                  * us what we need and suppress the probe req
 756                                  */
 757                                 ieee80211_probe_curchan(vap, 1);
 758                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 759                         }
 760                         ieee80211_add_scan(vap, rxchan, &scan, wh,
 761                             subtype, rssi, nf);
 762                         return;
 763                 }
 764                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 765                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 766                                 /*
 767                                  * Create a new entry in the neighbor table.
 768                                  *
 769                                  * XXX TODO:
 770                                  *
 771                                  * Here we're not scanning; so if we have an
 772                                  * SSID then make sure it matches our SSID.
 773                                  * Otherwise this code will match on all IBSS
 774                                  * beacons/probe requests for all SSIDs,
 775                                  * filling the node table with nodes that
 776                                  * aren't ours.
 777                                  */
 778                                 if (ieee80211_ibss_node_check_new(ni, &scan)) {
 779                                         ni = ieee80211_add_neighbor(vap, wh, &scan);
 780                                         /*
 781                                          * Send a probe request so we announce 11n
 782                                          * capabilities.
 783                                          */
 784                                         ieee80211_send_probereq(ni, /* node */
 785                                             vap->iv_myaddr, /* SA */
 786                                             ni->ni_macaddr, /* DA */
 787                                             vap->iv_bss->ni_bssid, /* BSSID */
 788                                             vap->iv_bss->ni_essid,
 789                                             vap->iv_bss->ni_esslen); /* SSID */
 790                                 } else
 791                                         ni = NULL;
 792
 793                         } else if (ni->ni_capinfo == 0) {
 794                                 /*
 795                                  * Update faked node created on transmit.
 796                                  * Note this also updates the tsf.
 797                                  */
 798                                 ieee80211_init_neighbor(ni, wh, &scan);
 799
 800                                 /*
 801                                  * Send a probe request so we announce 11n
 802                                  * capabilities.
 803                                  */
 804                                 ieee80211_send_probereq(ni, /* node */
 805                                         vap->iv_myaddr, /* SA */
 806                                         ni->ni_macaddr, /* DA */
 807                                         vap->iv_bss->ni_bssid, /* BSSID */
 808                                         vap->iv_bss->ni_essid,
 809                                         vap->iv_bss->ni_esslen); /* SSID */
 810                         } else {
 811                                 /*
 812                                  * Record tsf for potential resync.
 813                                  */
 814                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 815                                         sizeof(ni->ni_tstamp));
 816                         }
 817                         /*
 818                          * This isn't enabled yet - otherwise it would
 819                          * update the HT parameters and channel width
 820                          * from any node, which could lead to lots of
 821                          * strange behaviour if the 11n nodes aren't
 822                          * exactly configured to match.
 823                          */
 824 #if 0
 825                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 826                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 827                                 ieee80211_ht_updateparams(ni,
 828                                     scan.htcap, scan.htinfo));
 829                                 if (ieee80211_ht_updateparams_final(ni,
 830                                     scan.htcap, scan.htinfo))
 831                                         ht_state_change = 1;
 832                         }
 833
 834                         /* XXX same for VHT? */
 835 #endif
 836                         if (ni != NULL) {
 837                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 838                                 ni->ni_noise = nf;
 839                         }
 840                         /*
 841                          * Same here - the channel width change should
 842                          * be applied to the specific peer node, not
 843                          * to the ic.  Ie, the interface configuration
 844                          * should stay in its current channel width;
 845                          * but it should change the rate control and
 846                          * any queued frames for the given node only.
 847                          *
 848                          * Since there's no (current) way to inform
 849                          * the driver that a channel width change has
 850                          * occurred for a single node, just stub this
 851                          * out.
 852                          */
 853 #if 0
 854                         if (ht_state_change)
 855                                 ieee80211_update_chw(ic);
 856 #endif
 857                 }
 858                 break;
 859         }
 860
 861         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 862                 if (vap->iv_state != IEEE80211_S_RUN) {
 863                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 864                             wh, NULL, "wrong state %s",
 865                             ieee80211_state_name[vap->iv_state]);
 866                         vap->iv_stats.is_rx_mgtdiscard++;
 867                         return;
 868                 }
 869                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 870                         /* frame must be directed */
 871                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 872                             wh, NULL, "%s", "not unicast");
 873                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 874                         return;
 875                 }
 876
 877                 /*
 878                  * prreq frame format
 879                  *      [tlv] ssid
 880                  *      [tlv] supported rates
 881                  *      [tlv] extended supported rates
 882                  */
 883                 ssid = rates = xrates = NULL;
 884                 while (efrm - frm > 1) {
 885                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 886                         switch (*frm) {
 887                         case IEEE80211_ELEMID_SSID:
 888                                 ssid = frm;
 889                                 break;
 890                         case IEEE80211_ELEMID_RATES:
 891                                 rates = frm;
 892                                 break;
 893                         case IEEE80211_ELEMID_XRATES:
 894                                 xrates = frm;
 895                                 break;
 896                         }
 897                         frm += frm[1] + 2;
 898                 }
 899                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 900                 if (xrates != NULL)
 901                         IEEE80211_VERIFY_ELEMENT(xrates,
 902                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 903                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 904                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 905                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 906                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 907                             wh, NULL,
 908                             "%s", "no ssid with ssid suppression enabled");
 909                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 910                         return;
 911                 }
 912
 913                 /* XXX find a better class or define it's own */
 914                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 915                     "%s", "recv probe req");
 916                 /*
 917                  * Some legacy 11b clients cannot hack a complete
 918                  * probe response frame.  When the request includes
 919                  * only a bare-bones rate set, communicate this to
 920                  * the transmit side.
 921                  */
 922                 ieee80211_send_proberesp(vap, wh->i_addr2,
 923                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 924
 925                 /*
 926                  * Note: we don't benefit from stashing the probe request
 927                  * IEs away to use for IBSS negotiation, because we
 928                  * typically don't get all of the IEs.
 929                  */
 930                 break;
 931
 932         case IEEE80211_FC0_SUBTYPE_ACTION:
 933         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 934                 if ((ni == vap->iv_bss) &&
 935                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 936                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 937                             wh, NULL, "%s", "unknown node");
 938                         vap->iv_stats.is_rx_mgtdiscard++;
 939                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 940                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 941                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 942                             wh, NULL, "%s", "not for us");
 943                         vap->iv_stats.is_rx_mgtdiscard++;
 944                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 945                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 946                             wh, NULL, "wrong state %s",
 947                             ieee80211_state_name[vap->iv_state]);
 948                         vap->iv_stats.is_rx_mgtdiscard++;
 949                 } else {
 950                         if (ieee80211_parse_action(ni, m0) == 0)
 951                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 952                 }
 953                 break;
 954
 955         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 956         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 957         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 958         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 959         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 960         case IEEE80211_FC0_SUBTYPE_ATIM:
 961         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 962         case IEEE80211_FC0_SUBTYPE_AUTH:
 963         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 964                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 965                     wh, NULL, "%s", "not handled");
 966                 vap->iv_stats.is_rx_mgtdiscard++;
 967                 break;
 968
 969         default:
 970                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 971                     wh, "mgt", "subtype 0x%x not handled", subtype);
 972                 vap->iv_stats.is_rx_badsubtype++;
 973                 break;
 974         }
 975 }
 976 #undef IEEE80211_VERIFY_LENGTH
 977 #undef IEEE80211_VERIFY_ELEMENT
 978
 979 static void
 980 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 981         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 982 {
 983         struct ieee80211vap *vap = ni->ni_vap;
 984         struct ieee80211com *ic = ni->ni_ic;
 985         struct ieee80211_frame *wh;
 986
 987         /*
 988          * Process management frames when scanning; useful for doing
 989          * a site-survey.
 990          */
 991         if (ic->ic_flags & IEEE80211_F_SCAN)
 992                 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
 993         else {
 994                 wh = mtod(m0, struct ieee80211_frame *);
 995                 switch (subtype) {
 996                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 997                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 998                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 999                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1000                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1001                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1002                 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1003                 case IEEE80211_FC0_SUBTYPE_BEACON:
1004                 case IEEE80211_FC0_SUBTYPE_ATIM:
1005                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1006                 case IEEE80211_FC0_SUBTYPE_AUTH:
1007                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1008                 case IEEE80211_FC0_SUBTYPE_ACTION:
1009                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1010                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1011                              wh, NULL, "%s", "not handled");
1012                         vap->iv_stats.is_rx_mgtdiscard++;
1013                         break;
1014                 default:
1015                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1016                              wh, "mgt", "subtype 0x%x not handled", subtype);
1017                         vap->iv_stats.is_rx_badsubtype++;
1018                         break;
1019                 }
1020         }
1021 }
1022
1023 static void
1024 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1025 {
1026
1027         switch (subtype) {
1028         case IEEE80211_FC0_SUBTYPE_BAR:
1029                 ieee80211_recv_bar(ni, m);
1030                 break;
1031         }
1032 }