sys/net80211/ieee80211_adhoc.c

   1 /*-
   2  * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 IBSS mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <net80211/ieee80211_var.h>
  59 #include <net80211/ieee80211_adhoc.h>
  60 #include <net80211/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <net80211/ieee80211_superg.h>
  63 #endif
  64 #ifdef IEEE80211_SUPPORT_TDMA
  65 #include <net80211/ieee80211_tdma.h>
  66 #endif
  67 #include <net80211/ieee80211_sta.h>
  68
  69 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  70
  71 static  void adhoc_vattach(struct ieee80211vap *);
  72 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  73 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
  74             const struct ieee80211_rx_stats *, int, int);
  75 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76         int subtype, const struct ieee80211_rx_stats *, int, int);
  77 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  78             int subtype, const struct ieee80211_rx_stats *rxs, int, int);
  79 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  80
  81 void
  82 ieee80211_adhoc_attach(struct ieee80211com *ic)
  83 {
  84         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  85         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  86 }
  87
  88 void
  89 ieee80211_adhoc_detach(struct ieee80211com *ic)
  90 {
  91 }
  92
  93 static void
  94 adhoc_vdetach(struct ieee80211vap *vap)
  95 {
  96 }
  97
  98 static void
  99 adhoc_vattach(struct ieee80211vap *vap)
 100 {
 101         vap->iv_newstate = adhoc_newstate;
 102         vap->iv_input = adhoc_input;
 103         if (vap->iv_opmode == IEEE80211_M_IBSS)
 104                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 105         else
 106                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 107         vap->iv_recv_ctl = adhoc_recv_ctl;
 108         vap->iv_opdetach = adhoc_vdetach;
 109 #ifdef IEEE80211_SUPPORT_TDMA
 110         /*
 111          * Throw control to tdma support.  Note we do this
 112          * after setting up our callbacks so it can piggyback
 113          * on top of us.
 114          */
 115         if (vap->iv_caps & IEEE80211_C_TDMA)
 116                 ieee80211_tdma_vattach(vap);
 117 #endif
 118 }
 119
 120 static void
 121 sta_leave(void *arg, struct ieee80211_node *ni)
 122 {
 123         struct ieee80211vap *vap = arg;
 124
 125         if (ni->ni_vap == vap && ni != vap->iv_bss)
 126                 ieee80211_node_leave(ni);
 127 }
 128
 129 /*
 130  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 131  */
 132 static int
 133 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 134 {
 135         struct ieee80211com *ic = vap->iv_ic;
 136         struct ieee80211_node *ni;
 137         enum ieee80211_state ostate;
 138
 139         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 140
 141         ostate = vap->iv_state;
 142         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 143             __func__, ieee80211_state_name[ostate],
 144             ieee80211_state_name[nstate], arg);
 145         vap->iv_state = nstate;                 /* state transition */
 146         if (ostate != IEEE80211_S_SCAN)
 147                 ieee80211_cancel_scan(vap);     /* background scan */
 148         ni = vap->iv_bss;                       /* NB: no reference held */
 149         switch (nstate) {
 150         case IEEE80211_S_INIT:
 151                 switch (ostate) {
 152                 case IEEE80211_S_SCAN:
 153                         ieee80211_cancel_scan(vap);
 154                         break;
 155                 default:
 156                         break;
 157                 }
 158                 if (ostate != IEEE80211_S_INIT) {
 159                         /* NB: optimize INIT -> INIT case */
 160                         ieee80211_reset_bss(vap);
 161                 }
 162                 break;
 163         case IEEE80211_S_SCAN:
 164                 switch (ostate) {
 165                 case IEEE80211_S_RUN:           /* beacon miss */
 166                         /* purge station table; entries are stale */
 167                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 168                         /* fall thru... */
 169                 case IEEE80211_S_INIT:
 170                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 171                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 172                                 /*
 173                                  * Already have a channel; bypass the
 174                                  * scan and startup immediately.
 175                                  */
 176                                 ieee80211_create_ibss(vap,
 177                                     ieee80211_ht_adjust_channel(ic,
 178                                     vap->iv_des_chan, vap->iv_flags_ht));
 179                                 break;
 180                         }
 181                         /*
 182                          * Initiate a scan.  We can come here as a result
 183                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 184                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 185                          * and the scan request parameters will be present
 186                          * in iv_scanreq.  Otherwise we do the default.
 187                          */
 188                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 189                                 ieee80211_check_scan(vap,
 190                                     vap->iv_scanreq_flags,
 191                                     vap->iv_scanreq_duration,
 192                                     vap->iv_scanreq_mindwell,
 193                                     vap->iv_scanreq_maxdwell,
 194                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 195                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 196                         } else
 197                                 ieee80211_check_scan_current(vap);
 198                         break;
 199                 case IEEE80211_S_SCAN:
 200                         /*
 201                          * This can happen because of a change in state
 202                          * that requires a reset.  Trigger a new scan
 203                          * unless we're in manual roaming mode in which
 204                          * case an application must issue an explicit request.
 205                          */
 206                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 207                                 ieee80211_check_scan_current(vap);
 208                         break;
 209                 default:
 210                         goto invalid;
 211                 }
 212                 break;
 213         case IEEE80211_S_RUN:
 214                 if (vap->iv_flags & IEEE80211_F_WPA) {
 215                         /* XXX validate prerequisites */
 216                 }
 217                 switch (ostate) {
 218                 case IEEE80211_S_INIT:
 219                         /*
 220                          * Already have a channel; bypass the
 221                          * scan and startup immediately.
 222                          * Note that ieee80211_create_ibss will call
 223                          * back to do a RUN->RUN state change.
 224                          */
 225                         ieee80211_create_ibss(vap,
 226                             ieee80211_ht_adjust_channel(ic,
 227                                 ic->ic_curchan, vap->iv_flags_ht));
 228                         /* NB: iv_bss is changed on return */
 229                         ni = vap->iv_bss;
 230                         break;
 231                 case IEEE80211_S_SCAN:
 232 #ifdef IEEE80211_DEBUG
 233                         if (ieee80211_msg_debug(vap)) {
 234                                 ieee80211_note(vap,
 235                                     "synchronized with %s ssid ",
 236                                     ether_sprintf(ni->ni_bssid));
 237                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 238                                     ni->ni_esslen);
 239                                 /* XXX MCS/HT */
 240                                 printf(" channel %d start %uMb\n",
 241                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 242                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 243                         }
 244 #endif
 245                         break;
 246                 case IEEE80211_S_RUN:   /* IBSS merge */
 247                         break;
 248                 default:
 249                         goto invalid;
 250                 }
 251                 /*
 252                  * When 802.1x is not in use mark the port authorized
 253                  * at this point so traffic can flow.
 254                  */
 255                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 256                         ieee80211_node_authorize(ni);
 257                 /*
 258                  * Fake association when joining an existing bss.
 259                  */
 260                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 261                     ic->ic_newassoc != NULL)
 262                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 263                 break;
 264         case IEEE80211_S_SLEEP:
 265                 vap->iv_sta_ps(vap, 0);
 266                 break;
 267         default:
 268         invalid:
 269                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 270                     "%s: unexpected state transition %s -> %s\n", __func__,
 271                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 272                 break;
 273         }
 274         return 0;
 275 }
 276
 277 /*
 278  * Decide if a received management frame should be
 279  * printed when debugging is enabled.  This filters some
 280  * of the less interesting frames that come frequently
 281  * (e.g. beacons).
 282  */
 283 static __inline int
 284 doprint(struct ieee80211vap *vap, int subtype)
 285 {
 286         switch (subtype) {
 287         case IEEE80211_FC0_SUBTYPE_BEACON:
 288                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 289         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 290                 return 1;
 291         }
 292         return 1;
 293 }
 294
 295 /*
 296  * Process a received frame.  The node associated with the sender
 297  * should be supplied.  If nothing was found in the node table then
 298  * the caller is assumed to supply a reference to iv_bss instead.
 299  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 300  * during AP scanning to select a AP to associate with; it can have
 301  * any units so long as values have consistent units and higher values
 302  * mean ``better signal''.  The receive timestamp is currently not used
 303  * by the 802.11 layer.
 304  */
 305 static int
 306 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
 307     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 308 {
 309         struct ieee80211vap *vap = ni->ni_vap;
 310         struct ieee80211com *ic = ni->ni_ic;
 311         struct ifnet *ifp = vap->iv_ifp;
 312         struct ieee80211_frame *wh;
 313         struct ieee80211_key *key;
 314         struct ether_header *eh;
 315         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 316         uint8_t dir, type, subtype, qos;
 317         uint8_t *bssid;
 318
 319         if (m->m_flags & M_AMPDU_MPDU) {
 320                 /*
 321                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 322                  * w/ M_AMPDU_MPDU marked have already passed through
 323                  * here but were received out of order and been held on
 324                  * the reorder queue.  When resubmitted they are marked
 325                  * with the M_AMPDU_MPDU flag and we can bypass most of
 326                  * the normal processing.
 327                  */
 328                 wh = mtod(m, struct ieee80211_frame *);
 329                 type = IEEE80211_FC0_TYPE_DATA;
 330                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 331                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 332                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 333                 goto resubmit_ampdu;
 334         }
 335
 336         KASSERT(ni != NULL, ("null node"));
 337         ni->ni_inact = ni->ni_inact_reload;
 338
 339         type = -1;                      /* undefined */
 340
 341         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 342                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 343                     ni->ni_macaddr, NULL,
 344                     "too short (1): len %u", m->m_pkthdr.len);
 345                 vap->iv_stats.is_rx_tooshort++;
 346                 goto out;
 347         }
 348         /*
 349          * Bit of a cheat here, we use a pointer for a 3-address
 350          * frame format but don't reference fields past outside
 351          * ieee80211_frame_min w/o first validating the data is
 352          * present.
 353          */
 354         wh = mtod(m, struct ieee80211_frame *);
 355
 356         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 357             IEEE80211_FC0_VERSION_0) {
 358                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 359                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 360                     wh->i_fc[0], wh->i_fc[1]);
 361                 vap->iv_stats.is_rx_badversion++;
 362                 goto err;
 363         }
 364
 365         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 366         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 367         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 368         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 369                 if (dir != IEEE80211_FC1_DIR_NODS)
 370                         bssid = wh->i_addr1;
 371                 else if (type == IEEE80211_FC0_TYPE_CTL)
 372                         bssid = wh->i_addr1;
 373                 else {
 374                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 375                                 IEEE80211_DISCARD_MAC(vap,
 376                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 377                                     NULL, "too short (2): len %u",
 378                                     m->m_pkthdr.len);
 379                                 vap->iv_stats.is_rx_tooshort++;
 380                                 goto out;
 381                         }
 382                         bssid = wh->i_addr3;
 383                 }
 384                 /*
 385                  * Validate the bssid.
 386                  */
 387                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 388                      (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
 389                       subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
 390                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 391                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 392                         /* not interested in */
 393                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 394                             bssid, NULL, "%s", "not to bss");
 395                         vap->iv_stats.is_rx_wrongbss++;
 396                         goto out;
 397                 }
 398                 /*
 399                  * Data frame, cons up a node when it doesn't
 400                  * exist. This should probably done after an ACL check.
 401                  */
 402                 if (type == IEEE80211_FC0_TYPE_DATA &&
 403                     ni == vap->iv_bss &&
 404                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 405                         /*
 406                          * Beware of frames that come in too early; we
 407                          * can receive broadcast frames and creating sta
 408                          * entries will blow up because there is no bss
 409                          * channel yet.
 410                          */
 411                         if (vap->iv_state != IEEE80211_S_RUN) {
 412                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 413                                     wh, "data", "not in RUN state (%s)",
 414                                     ieee80211_state_name[vap->iv_state]);
 415                                 vap->iv_stats.is_rx_badstate++;
 416                                 goto err;
 417                         }
 418                         /*
 419                          * Fake up a node for this newly
 420                          * discovered member of the IBSS.
 421                          */
 422                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 423                         if (ni == NULL) {
 424                                 /* NB: stat kept for alloc failure */
 425                                 goto err;
 426                         }
 427                 }
 428                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 429                 ni->ni_noise = nf;
 430                 if (IEEE80211_HAS_SEQ(type, subtype) &&
 431                     IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 432                         uint8_t tid = ieee80211_gettid(wh);
 433                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 434                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 435                                 ic->ic_wme.wme_hipri_traffic++;
 436                         if (! ieee80211_check_rxseq(ni, wh, bssid))
 437                                 goto out;
 438                 }
 439         }
 440
 441         switch (type) {
 442         case IEEE80211_FC0_TYPE_DATA:
 443                 hdrspace = ieee80211_hdrspace(ic, wh);
 444                 if (m->m_len < hdrspace &&
 445                     (m = m_pullup(m, hdrspace)) == NULL) {
 446                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 447                             ni->ni_macaddr, NULL,
 448                             "data too short: expecting %u", hdrspace);
 449                         vap->iv_stats.is_rx_tooshort++;
 450                         goto out;               /* XXX */
 451                 }
 452                 if (dir != IEEE80211_FC1_DIR_NODS) {
 453                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 454                             wh, "data", "incorrect dir 0x%x", dir);
 455                         vap->iv_stats.is_rx_wrongdir++;
 456                         goto out;
 457                 }
 458                 /* XXX no power-save support */
 459
 460                 /*
 461                  * Handle A-MPDU re-ordering.  If the frame is to be
 462                  * processed directly then ieee80211_ampdu_reorder
 463                  * will return 0; otherwise it has consumed the mbuf
 464                  * and we should do nothing more with it.
 465                  */
 466                 if ((m->m_flags & M_AMPDU) &&
 467                     ieee80211_ampdu_reorder(ni, m) != 0) {
 468                         m = NULL;
 469                         goto out;
 470                 }
 471         resubmit_ampdu:
 472
 473                 /*
 474                  * Handle privacy requirements.  Note that we
 475                  * must not be preempted from here until after
 476                  * we (potentially) call ieee80211_crypto_demic;
 477                  * otherwise we may violate assumptions in the
 478                  * crypto cipher modules used to do delayed update
 479                  * of replay sequence numbers.
 480                  */
 481                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 482                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 483                                 /*
 484                                  * Discard encrypted frames when privacy is off.
 485                                  */
 486                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 487                                     wh, "WEP", "%s", "PRIVACY off");
 488                                 vap->iv_stats.is_rx_noprivacy++;
 489                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 490                                 goto out;
 491                         }
 492                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 493                         if (key == NULL) {
 494                                 /* NB: stats+msgs handled in crypto_decap */
 495                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 496                                 goto out;
 497                         }
 498                         wh = mtod(m, struct ieee80211_frame *);
 499                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 500                 } else {
 501                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 502                         key = NULL;
 503                 }
 504
 505                 /*
 506                  * Save QoS bits for use below--before we strip the header.
 507                  */
 508                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 509                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 510                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 511                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 512                 } else
 513                         qos = 0;
 514
 515                 /*
 516                  * Next up, any fragmentation.
 517                  */
 518                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 519                         m = ieee80211_defrag(ni, m, hdrspace);
 520                         if (m == NULL) {
 521                                 /* Fragment dropped or frame not complete yet */
 522                                 goto out;
 523                         }
 524                 }
 525                 wh = NULL;              /* no longer valid, catch any uses */
 526
 527                 /*
 528                  * Next strip any MSDU crypto bits.
 529                  */
 530                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 531                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 532                             ni->ni_macaddr, "data", "%s", "demic error");
 533                         vap->iv_stats.is_rx_demicfail++;
 534                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 535                         goto out;
 536                 }
 537
 538                 /* copy to listener after decrypt */
 539                 if (ieee80211_radiotap_active_vap(vap))
 540                         ieee80211_radiotap_rx(vap, m);
 541                 need_tap = 0;
 542
 543                 /*
 544                  * Finally, strip the 802.11 header.
 545                  */
 546                 m = ieee80211_decap(vap, m, hdrspace);
 547                 if (m == NULL) {
 548                         /* XXX mask bit to check for both */
 549                         /* don't count Null data frames as errors */
 550                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 551                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 552                                 goto out;
 553                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 554                             ni->ni_macaddr, "data", "%s", "decap error");
 555                         vap->iv_stats.is_rx_decap++;
 556                         IEEE80211_NODE_STAT(ni, rx_decap);
 557                         goto err;
 558                 }
 559                 eh = mtod(m, struct ether_header *);
 560                 if (!ieee80211_node_is_authorized(ni)) {
 561                         /*
 562                          * Deny any non-PAE frames received prior to
 563                          * authorization.  For open/shared-key
 564                          * authentication the port is mark authorized
 565                          * after authentication completes.  For 802.1x
 566                          * the port is not marked authorized by the
 567                          * authenticator until the handshake has completed.
 568                          */
 569                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 570                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 571                                     eh->ether_shost, "data",
 572                                     "unauthorized port: ether type 0x%x len %u",
 573                                     eh->ether_type, m->m_pkthdr.len);
 574                                 vap->iv_stats.is_rx_unauth++;
 575                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 576                                 goto err;
 577                         }
 578                 } else {
 579                         /*
 580                          * When denying unencrypted frames, discard
 581                          * any non-PAE frames received without encryption.
 582                          */
 583                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 584                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 585                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 586                                 /*
 587                                  * Drop unencrypted frames.
 588                                  */
 589                                 vap->iv_stats.is_rx_unencrypted++;
 590                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 591                                 goto out;
 592                         }
 593                 }
 594                 /* XXX require HT? */
 595                 if (qos & IEEE80211_QOS_AMSDU) {
 596                         m = ieee80211_decap_amsdu(ni, m);
 597                         if (m == NULL)
 598                                 return IEEE80211_FC0_TYPE_DATA;
 599                 } else {
 600 #ifdef IEEE80211_SUPPORT_SUPERG
 601                         m = ieee80211_decap_fastframe(vap, ni, m);
 602                         if (m == NULL)
 603                                 return IEEE80211_FC0_TYPE_DATA;
 604 #endif
 605                 }
 606                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 607                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 608                 else
 609                         ieee80211_deliver_data(vap, ni, m);
 610                 return IEEE80211_FC0_TYPE_DATA;
 611
 612         case IEEE80211_FC0_TYPE_MGT:
 613                 vap->iv_stats.is_rx_mgmt++;
 614                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 615                 if (dir != IEEE80211_FC1_DIR_NODS) {
 616                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 617                             wh, "data", "incorrect dir 0x%x", dir);
 618                         vap->iv_stats.is_rx_wrongdir++;
 619                         goto err;
 620                 }
 621                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 622                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 623                             ni->ni_macaddr, "mgt", "too short: len %u",
 624                             m->m_pkthdr.len);
 625                         vap->iv_stats.is_rx_tooshort++;
 626                         goto out;
 627                 }
 628 #ifdef IEEE80211_DEBUG
 629                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 630                     ieee80211_msg_dumppkts(vap)) {
 631                         if_printf(ifp, "received %s from %s rssi %d\n",
 632                             ieee80211_mgt_subtype_name(subtype),
 633                             ether_sprintf(wh->i_addr2), rssi);
 634                 }
 635 #endif
 636                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 637                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 638                             wh, NULL, "%s", "WEP set but not permitted");
 639                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 640                         goto out;
 641                 }
 642                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 643                 goto out;
 644
 645         case IEEE80211_FC0_TYPE_CTL:
 646                 vap->iv_stats.is_rx_ctl++;
 647                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 648                 vap->iv_recv_ctl(ni, m, subtype);
 649                 goto out;
 650
 651         default:
 652                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 653                     wh, "bad", "frame type 0x%x", type);
 654                 /* should not come here */
 655                 break;
 656         }
 657 err:
 658         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 659 out:
 660         if (m != NULL) {
 661                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 662                         ieee80211_radiotap_rx(vap, m);
 663                 m_freem(m);
 664         }
 665         return type;
 666 }
 667
 668 static int
 669 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 670 {
 671         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 672         int i;
 673
 674         /* NB: the 11b clients we care about will not have xrates */
 675         if (xrates != NULL || rates == NULL)
 676                 return 0;
 677         for (i = 0; i < rates[1]; i++) {
 678                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 679                 if (r > 2*11 || ((1<<r) & brates) == 0)
 680                         return 0;
 681         }
 682         return 1;
 683 }
 684
 685 static void
 686 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 687         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 688 {
 689         struct ieee80211vap *vap = ni->ni_vap;
 690         struct ieee80211com *ic = ni->ni_ic;
 691         struct ieee80211_channel *rxchan = ic->ic_curchan;
 692         struct ieee80211_frame *wh;
 693         uint8_t *frm, *efrm;
 694         uint8_t *ssid, *rates, *xrates;
 695 #if 0
 696         int ht_state_change = 0;
 697 #endif
 698
 699         wh = mtod(m0, struct ieee80211_frame *);
 700         frm = (uint8_t *)&wh[1];
 701         efrm = mtod(m0, uint8_t *) + m0->m_len;
 702         switch (subtype) {
 703         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 704         case IEEE80211_FC0_SUBTYPE_BEACON: {
 705                 struct ieee80211_scanparams scan;
 706                 struct ieee80211_channel *c;
 707                 /*
 708                  * We process beacon/probe response
 709                  * frames to discover neighbors.
 710                  */
 711                 if (rxs != NULL) {
 712                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
 713                         if (c != NULL)
 714                                 rxchan = c;
 715                 }
 716                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
 717                         return;
 718                 /*
 719                  * Count frame now that we know it's to be processed.
 720                  */
 721                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 722                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 723                         IEEE80211_NODE_STAT(ni, rx_beacons);
 724                 } else
 725                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 726                 /*
 727                  * If scanning, just pass information to the scan module.
 728                  */
 729                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 730                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 731                                 /*
 732                                  * Actively scanning a channel marked passive;
 733                                  * send a probe request now that we know there
 734                                  * is 802.11 traffic present.
 735                                  *
 736                                  * XXX check if the beacon we recv'd gives
 737                                  * us what we need and suppress the probe req
 738                                  */
 739                                 ieee80211_probe_curchan(vap, 1);
 740                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 741                         }
 742                         ieee80211_add_scan(vap, rxchan, &scan, wh,
 743                             subtype, rssi, nf);
 744                         return;
 745                 }
 746                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 747                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 748                                 /*
 749                                  * Create a new entry in the neighbor table.
 750                                  *
 751                                  * XXX TODO:
 752                                  *
 753                                  * Here we're not scanning; so if we have an
 754                                  * SSID then make sure it matches our SSID.
 755                                  * Otherwise this code will match on all IBSS
 756                                  * beacons/probe requests for all SSIDs,
 757                                  * filling the node table with nodes that
 758                                  * aren't ours.
 759                                  */
 760                                 if (ieee80211_ibss_node_check_new(ni, &scan))
 761                                         ni = ieee80211_add_neighbor(vap, wh, &scan);
 762                                 else
 763                                         ni = NULL;
 764                         } else if (ni->ni_capinfo == 0) {
 765                                 /*
 766                                  * Update faked node created on transmit.
 767                                  * Note this also updates the tsf.
 768                                  */
 769                                 ieee80211_init_neighbor(ni, wh, &scan);
 770                         } else {
 771                                 /*
 772                                  * Record tsf for potential resync.
 773                                  */
 774                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 775                                         sizeof(ni->ni_tstamp));
 776                         }
 777                         /*
 778                          * This isn't enabled yet - otherwise it would
 779                          * update the HT parameters and channel width
 780                          * from any node, which could lead to lots of
 781                          * strange behaviour if the 11n nodes aren't
 782                          * exactly configured to match.
 783                          */
 784 #if 0
 785                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 786                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 787                                 if (ieee80211_ht_updateparams(ni,
 788                                     scan.htcap, scan.htinfo))
 789                                         ht_state_change = 1;
 790                         }
 791 #endif
 792                         if (ni != NULL) {
 793                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 794                                 ni->ni_noise = nf;
 795                         }
 796                         /*
 797                          * Same here - the channel width change should
 798                          * be applied to the specific peer node, not
 799                          * to the ic.  Ie, the interface configuration
 800                          * should stay in its current channel width;
 801                          * but it should change the rate control and
 802                          * any queued frames for the given node only.
 803                          *
 804                          * Since there's no (current) way to inform
 805                          * the driver that a channel width change has
 806                          * occurred for a single node, just stub this
 807                          * out.
 808                          */
 809 #if 0
 810                         if (ht_state_change)
 811                                 ieee80211_update_chw(ic);
 812 #endif
 813                 }
 814                 break;
 815         }
 816
 817         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 818                 if (vap->iv_state != IEEE80211_S_RUN) {
 819                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 820                             wh, NULL, "wrong state %s",
 821                             ieee80211_state_name[vap->iv_state]);
 822                         vap->iv_stats.is_rx_mgtdiscard++;
 823                         return;
 824                 }
 825                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 826                         /* frame must be directed */
 827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 828                             wh, NULL, "%s", "not unicast");
 829                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 830                         return;
 831                 }
 832
 833                 /*
 834                  * prreq frame format
 835                  *      [tlv] ssid
 836                  *      [tlv] supported rates
 837                  *      [tlv] extended supported rates
 838                  */
 839                 ssid = rates = xrates = NULL;
 840                 while (efrm - frm > 1) {
 841                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 842                         switch (*frm) {
 843                         case IEEE80211_ELEMID_SSID:
 844                                 ssid = frm;
 845                                 break;
 846                         case IEEE80211_ELEMID_RATES:
 847                                 rates = frm;
 848                                 break;
 849                         case IEEE80211_ELEMID_XRATES:
 850                                 xrates = frm;
 851                                 break;
 852                         }
 853                         frm += frm[1] + 2;
 854                 }
 855                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 856                 if (xrates != NULL)
 857                         IEEE80211_VERIFY_ELEMENT(xrates,
 858                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 859                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 860                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 861                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 862                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                             wh, NULL,
 864                             "%s", "no ssid with ssid suppression enabled");
 865                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 866                         return;
 867                 }
 868
 869                 /* XXX find a better class or define it's own */
 870                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 871                     "%s", "recv probe req");
 872                 /*
 873                  * Some legacy 11b clients cannot hack a complete
 874                  * probe response frame.  When the request includes
 875                  * only a bare-bones rate set, communicate this to
 876                  * the transmit side.
 877                  */
 878                 ieee80211_send_proberesp(vap, wh->i_addr2,
 879                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 880                 break;
 881
 882         case IEEE80211_FC0_SUBTYPE_ACTION:
 883         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 884                 if ((ni == vap->iv_bss) &&
 885                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 886                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 887                             wh, NULL, "%s", "unknown node");
 888                         vap->iv_stats.is_rx_mgtdiscard++;
 889                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 890                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 891                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 892                             wh, NULL, "%s", "not for us");
 893                         vap->iv_stats.is_rx_mgtdiscard++;
 894                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 895                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 896                             wh, NULL, "wrong state %s",
 897                             ieee80211_state_name[vap->iv_state]);
 898                         vap->iv_stats.is_rx_mgtdiscard++;
 899                 } else {
 900                         if (ieee80211_parse_action(ni, m0) == 0)
 901                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 902                 }
 903                 break;
 904
 905         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 906         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 907         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 908         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 909         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 910         case IEEE80211_FC0_SUBTYPE_ATIM:
 911         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 912         case IEEE80211_FC0_SUBTYPE_AUTH:
 913         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 914                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 915                     wh, NULL, "%s", "not handled");
 916                 vap->iv_stats.is_rx_mgtdiscard++;
 917                 break;
 918
 919         default:
 920                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 921                     wh, "mgt", "subtype 0x%x not handled", subtype);
 922                 vap->iv_stats.is_rx_badsubtype++;
 923                 break;
 924         }
 925 }
 926 #undef IEEE80211_VERIFY_LENGTH
 927 #undef IEEE80211_VERIFY_ELEMENT
 928
 929 static void
 930 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 931         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 932 {
 933         struct ieee80211vap *vap = ni->ni_vap;
 934         struct ieee80211com *ic = ni->ni_ic;
 935         struct ieee80211_frame *wh;
 936
 937         /*
 938          * Process management frames when scanning; useful for doing
 939          * a site-survey.
 940          */
 941         if (ic->ic_flags & IEEE80211_F_SCAN)
 942                 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
 943         else {
 944                 wh = mtod(m0, struct ieee80211_frame *);
 945                 switch (subtype) {
 946                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 947                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 948                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 949                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 950                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 951                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 952                 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 953                 case IEEE80211_FC0_SUBTYPE_BEACON:
 954                 case IEEE80211_FC0_SUBTYPE_ATIM:
 955                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
 956                 case IEEE80211_FC0_SUBTYPE_AUTH:
 957                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
 958                 case IEEE80211_FC0_SUBTYPE_ACTION:
 959                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 960                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 961                              wh, NULL, "%s", "not handled");
 962                         vap->iv_stats.is_rx_mgtdiscard++;
 963                         break;
 964                 default:
 965                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 966                              wh, "mgt", "subtype 0x%x not handled", subtype);
 967                         vap->iv_stats.is_rx_badsubtype++;
 968                         break;
 969                 }
 970         }
 971 }
 972
 973 static void
 974 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 975 {
 976
 977         switch (subtype) {
 978         case IEEE80211_FC0_SUBTYPE_BAR:
 979                 ieee80211_recv_bar(ni, m);
 980                 break;
 981         }
 982 }