sys/netproto/802_11/wlan/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  * $FreeBSD: head/sys/net80211/ieee80211_adhoc.c 203422 2010-02-03 10:07:43Z rpaulo $
  26  */
  27
  28 /*
  29  * IEEE 802.11 IBSS mode support.
  30  */
  31 #include "opt_inet.h"
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/malloc.h>
  38 #include <sys/kernel.h>
  39
  40 #include <sys/socket.h>
  41 #include <sys/sockio.h>
  42 #include <sys/endian.h>
  43 #include <sys/errno.h>
  44 #include <sys/proc.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_media.h>
  49 #include <net/if_llc.h>
  50 #include <net/ethernet.h>
  51 #include <net/route.h>
  52
  53 #include <net/bpf.h>
  54
  55 #include <netproto/802_11/ieee80211_var.h>
  56 #include <netproto/802_11/ieee80211_adhoc.h>
  57 #include <netproto/802_11/ieee80211_input.h>
  58 #ifdef IEEE80211_SUPPORT_SUPERG
  59 #include <netproto/802_11/ieee80211_superg.h>
  60 #endif
  61 #ifdef IEEE80211_SUPPORT_TDMA
  62 #include <netproto/802_11/ieee80211_tdma.h>
  63 #endif
  64
  65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  66
  67 static  void adhoc_vattach(struct ieee80211vap *);
  68 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  69 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
  70 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  71         int subtype, int, int);
  72 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  73         int subtype, int, int);
  74 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  75
  76 void
  77 ieee80211_adhoc_attach(struct ieee80211com *ic)
  78 {
  79         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  80         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  81 }
  82
  83 void
  84 ieee80211_adhoc_detach(struct ieee80211com *ic)
  85 {
  86 }
  87
  88 static void
  89 adhoc_vdetach(struct ieee80211vap *vap)
  90 {
  91 }
  92
  93 static void
  94 adhoc_vattach(struct ieee80211vap *vap)
  95 {
  96         vap->iv_newstate = adhoc_newstate;
  97         vap->iv_input = adhoc_input;
  98         if (vap->iv_opmode == IEEE80211_M_IBSS)
  99                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 100         else
 101                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 102         vap->iv_recv_ctl = adhoc_recv_ctl;
 103         vap->iv_opdetach = adhoc_vdetach;
 104 #ifdef IEEE80211_SUPPORT_TDMA
 105         /*
 106          * Throw control to tdma support.  Note we do this
 107          * after setting up our callbacks so it can piggyback
 108          * on top of us.
 109          */
 110         if (vap->iv_caps & IEEE80211_C_TDMA)
 111                 ieee80211_tdma_vattach(vap);
 112 #endif
 113 }
 114
 115 static void
 116 sta_leave(void *arg, struct ieee80211_node *ni)
 117 {
 118         struct ieee80211vap *vap = arg;
 119
 120         if (ni->ni_vap == vap && ni != vap->iv_bss)
 121                 ieee80211_node_leave(ni);
 122 }
 123
 124 /*
 125  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 126  */
 127 static int
 128 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 129 {
 130         struct ieee80211com *ic = vap->iv_ic;
 131         struct ieee80211_node *ni;
 132         enum ieee80211_state ostate;
 133 #ifdef IEEE80211_DEBUG
 134         char ethstr[ETHER_ADDRSTRLEN + 1];
 135 #endif
 136
 137         ostate = vap->iv_state;
 138         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 139             __func__, ieee80211_state_name[ostate],
 140             ieee80211_state_name[nstate], arg);
 141         vap->iv_state = nstate;                 /* state transition */
 142         if (ostate != IEEE80211_S_SCAN)
 143                 ieee80211_cancel_scan(vap);     /* background scan */
 144         ni = vap->iv_bss;                       /* NB: no reference held */
 145         switch (nstate) {
 146         case IEEE80211_S_INIT:
 147                 switch (ostate) {
 148                 case IEEE80211_S_SCAN:
 149                         ieee80211_cancel_scan(vap);
 150                         break;
 151                 default:
 152                         break;
 153                 }
 154                 if (ostate != IEEE80211_S_INIT) {
 155                         /* NB: optimize INIT -> INIT case */
 156                         ieee80211_reset_bss(vap);
 157                 }
 158                 break;
 159         case IEEE80211_S_SCAN:
 160                 switch (ostate) {
 161                 case IEEE80211_S_RUN:           /* beacon miss */
 162                         /* purge station table; entries are stale */
 163                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 164                         /* fall thru... */
 165                 case IEEE80211_S_INIT:
 166                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 167                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 168                                 /*
 169                                  * Already have a channel; bypass the
 170                                  * scan and startup immediately.
 171                                  */
 172                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 173                                 break;
 174                         }
 175                         /*
 176                          * Initiate a scan.  We can come here as a result
 177                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 178                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 179                          * and the scan request parameters will be present
 180                          * in iv_scanreq.  Otherwise we do the default.
 181                          */
 182                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 183                                 ieee80211_check_scan(vap,
 184                                     vap->iv_scanreq_flags,
 185                                     vap->iv_scanreq_duration,
 186                                     vap->iv_scanreq_mindwell,
 187                                     vap->iv_scanreq_maxdwell,
 188                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 189                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 190                         } else
 191                                 ieee80211_check_scan_current(vap);
 192                         break;
 193                 case IEEE80211_S_SCAN:
 194                         /*
 195                          * This can happen because of a change in state
 196                          * that requires a reset.  Trigger a new scan
 197                          * unless we're in manual roaming mode in which
 198                          * case an application must issue an explicit request.
 199                          */
 200                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 201                                 ieee80211_check_scan_current(vap);
 202                         break;
 203                 default:
 204                         goto invalid;
 205                 }
 206                 break;
 207         case IEEE80211_S_RUN:
 208                 if (vap->iv_flags & IEEE80211_F_WPA) {
 209                         /* XXX validate prerequisites */
 210                 }
 211                 switch (ostate) {
 212                 case IEEE80211_S_SCAN:
 213 #ifdef IEEE80211_DEBUG
 214                         if (ieee80211_msg_debug(vap)) {
 215                                 ieee80211_note(vap,
 216                                     "synchronized with %s ssid ",
 217                                     kether_ntoa(ni->ni_bssid, ethstr));
 218                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 219                                     ni->ni_esslen);
 220                                 /* XXX MCS/HT */
 221                                 kprintf(" channel %d start %uMb\n",
 222                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 223                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 224                         }
 225 #endif
 226                         break;
 227                 default:
 228                         goto invalid;
 229                 }
 230                 /*
 231                  * When 802.1x is not in use mark the port authorized
 232                  * at this point so traffic can flow.
 233                  */
 234                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 235                         ieee80211_node_authorize(ni);
 236                 /*
 237                  * Fake association when joining an existing bss.
 238                  */
 239                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 240                     ic->ic_newassoc != NULL)
 241                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 242                 break;
 243         case IEEE80211_S_SLEEP:
 244                 ieee80211_sta_pwrsave(vap, 0);
 245                 break;
 246         default:
 247         invalid:
 248                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 249                     "%s: unexpected state transition %s -> %s\n", __func__,
 250                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 251                 break;
 252         }
 253         return 0;
 254 }
 255
 256 /*
 257  * Decide if a received management frame should be
 258  * printed when debugging is enabled.  This filters some
 259  * of the less interesting frames that come frequently
 260  * (e.g. beacons).
 261  */
 262 static __inline int
 263 doprint(struct ieee80211vap *vap, int subtype)
 264 {
 265         switch (subtype) {
 266         case IEEE80211_FC0_SUBTYPE_BEACON:
 267                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 268         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 269                 return 1;
 270         }
 271         return 1;
 272 }
 273
 274 /*
 275  * Process a received frame.  The node associated with the sender
 276  * should be supplied.  If nothing was found in the node table then
 277  * the caller is assumed to supply a reference to iv_bss instead.
 278  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 279  * during AP scanning to select a AP to associate with; it can have
 280  * any units so long as values have consistent units and higher values
 281  * mean ``better signal''.  The receive timestamp is currently not used
 282  * by the 802.11 layer.
 283  */
 284 static int
 285 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 286 {
 287 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 288 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 289         struct ieee80211vap *vap = ni->ni_vap;
 290         struct ieee80211com *ic = ni->ni_ic;
 291         struct ifnet *ifp = vap->iv_ifp;
 292         struct ieee80211_frame *wh;
 293         struct ieee80211_key *key;
 294         struct ether_header *eh;
 295         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 296         uint8_t dir, type, subtype, qos;
 297         uint8_t *bssid;
 298         uint16_t rxseq;
 299 #ifdef IEEE80211_DEBUG
 300         char ethstr[ETHER_ADDRSTRLEN + 1];
 301 #endif
 302
 303         if (m->m_flags & M_AMPDU_MPDU) {
 304                 /*
 305                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 306                  * w/ M_AMPDU_MPDU marked have already passed through
 307                  * here but were received out of order and been held on
 308                  * the reorder queue.  When resubmitted they are marked
 309                  * with the M_AMPDU_MPDU flag and we can bypass most of
 310                  * the normal processing.
 311                  */
 312                 wh = mtod(m, struct ieee80211_frame *);
 313                 type = IEEE80211_FC0_TYPE_DATA;
 314                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 315                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 316                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 317                 goto resubmit_ampdu;
 318         }
 319
 320         KASSERT(ni != NULL, ("null node"));
 321         ni->ni_inact = ni->ni_inact_reload;
 322
 323         type = -1;                      /* undefined */
 324
 325         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 326                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 327                     ni->ni_macaddr, NULL,
 328                     "too short (1): len %u", m->m_pkthdr.len);
 329                 vap->iv_stats.is_rx_tooshort++;
 330                 goto out;
 331         }
 332         /*
 333          * Bit of a cheat here, we use a pointer for a 3-address
 334          * frame format but don't reference fields past outside
 335          * ieee80211_frame_min w/o first validating the data is
 336          * present.
 337          */
 338         wh = mtod(m, struct ieee80211_frame *);
 339
 340         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 341             IEEE80211_FC0_VERSION_0) {
 342                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 343                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 344                     wh->i_fc[0], wh->i_fc[1]);
 345                 vap->iv_stats.is_rx_badversion++;
 346                 goto err;
 347         }
 348
 349         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 350         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 351         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 352         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 353                 if (dir != IEEE80211_FC1_DIR_NODS)
 354                         bssid = wh->i_addr1;
 355                 else if (type == IEEE80211_FC0_TYPE_CTL)
 356                         bssid = wh->i_addr1;
 357                 else {
 358                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 359                                 IEEE80211_DISCARD_MAC(vap,
 360                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 361                                     NULL, "too short (2): len %u",
 362                                     m->m_pkthdr.len);
 363                                 vap->iv_stats.is_rx_tooshort++;
 364                                 goto out;
 365                         }
 366                         bssid = wh->i_addr3;
 367                 }
 368                 /*
 369                  * Validate the bssid.
 370                  */
 371                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 372                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 373                         /* not interested in */
 374                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 375                             bssid, NULL, "%s", "not to bss");
 376                         vap->iv_stats.is_rx_wrongbss++;
 377                         goto out;
 378                 }
 379                 /*
 380                  * Data frame, cons up a node when it doesn't
 381                  * exist. This should probably done after an ACL check.
 382                  */
 383                 if (type == IEEE80211_FC0_TYPE_DATA &&
 384                     ni == vap->iv_bss &&
 385                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 386                         /*
 387                          * Beware of frames that come in too early; we
 388                          * can receive broadcast frames and creating sta
 389                          * entries will blow up because there is no bss
 390                          * channel yet.
 391                          */
 392                         if (vap->iv_state != IEEE80211_S_RUN) {
 393                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 394                                     wh, "data", "not in RUN state (%s)",
 395                                     ieee80211_state_name[vap->iv_state]);
 396                                 vap->iv_stats.is_rx_badstate++;
 397                                 goto err;
 398                         }
 399                         /*
 400                          * Fake up a node for this newly
 401                          * discovered member of the IBSS.
 402                          */
 403                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 404                         if (ni == NULL) {
 405                                 /* NB: stat kept for alloc failure */
 406                                 goto err;
 407                         }
 408                 }
 409                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 410                 ni->ni_noise = nf;
 411                 if (HAS_SEQ(type)) {
 412                         uint8_t tid = ieee80211_gettid(wh);
 413                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 414                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 415                                 ic->ic_wme.wme_hipri_traffic++;
 416                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 417                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 418                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 419                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 420                                 /* duplicate, discard */
 421                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 422                                     bssid, "duplicate",
 423                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 424                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 425                                     ni->ni_rxseqs[tid] >>
 426                                         IEEE80211_SEQ_SEQ_SHIFT,
 427                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 428                                     ni->ni_rxseqs[tid] &
 429                                         IEEE80211_SEQ_FRAG_MASK,
 430                                     tid);
 431                                 vap->iv_stats.is_rx_dup++;
 432                                 IEEE80211_NODE_STAT(ni, rx_dup);
 433                                 goto out;
 434                         }
 435                         ni->ni_rxseqs[tid] = rxseq;
 436                 }
 437         }
 438
 439         switch (type) {
 440         case IEEE80211_FC0_TYPE_DATA:
 441                 hdrspace = ieee80211_hdrspace(ic, wh);
 442                 if (m->m_len < hdrspace &&
 443                     (m = m_pullup(m, hdrspace)) == NULL) {
 444                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 445                             ni->ni_macaddr, NULL,
 446                             "data too short: expecting %u", hdrspace);
 447                         vap->iv_stats.is_rx_tooshort++;
 448                         goto out;               /* XXX */
 449                 }
 450                 if (dir != IEEE80211_FC1_DIR_NODS) {
 451                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 452                             wh, "data", "incorrect dir 0x%x", dir);
 453                         vap->iv_stats.is_rx_wrongdir++;
 454                         goto out;
 455                 }
 456                 /* XXX no power-save support */
 457
 458                 /*
 459                  * Handle A-MPDU re-ordering.  If the frame is to be
 460                  * processed directly then ieee80211_ampdu_reorder
 461                  * will return 0; otherwise it has consumed the mbuf
 462                  * and we should do nothing more with it.
 463                  */
 464                 if ((m->m_flags & M_AMPDU) &&
 465                     ieee80211_ampdu_reorder(ni, m) != 0) {
 466                         m = NULL;
 467                         goto out;
 468                 }
 469         resubmit_ampdu:
 470
 471                 /*
 472                  * Handle privacy requirements.  Note that we
 473                  * must not be preempted from here until after
 474                  * we (potentially) call ieee80211_crypto_demic;
 475                  * otherwise we may violate assumptions in the
 476                  * crypto cipher modules used to do delayed update
 477                  * of replay sequence numbers.
 478                  */
 479                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 480                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 481                                 /*
 482                                  * Discard encrypted frames when privacy is off.
 483                                  */
 484                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 485                                     wh, "WEP", "%s", "PRIVACY off");
 486                                 vap->iv_stats.is_rx_noprivacy++;
 487                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 488                                 goto out;
 489                         }
 490                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 491                         if (key == NULL) {
 492                                 /* NB: stats+msgs handled in crypto_decap */
 493                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 494                                 goto out;
 495                         }
 496                         wh = mtod(m, struct ieee80211_frame *);
 497                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 498                 } else {
 499                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 500                         key = NULL;
 501                 }
 502
 503                 /*
 504                  * Save QoS bits for use below--before we strip the header.
 505                  */
 506                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 507                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 508                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 509                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 510                 } else
 511                         qos = 0;
 512
 513                 /*
 514                  * Next up, any fragmentation.
 515                  */
 516                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 517                         m = ieee80211_defrag(ni, m, hdrspace);
 518                         if (m == NULL) {
 519                                 /* Fragment dropped or frame not complete yet */
 520                                 goto out;
 521                         }
 522                 }
 523                 wh = NULL;              /* no longer valid, catch any uses */
 524
 525                 /*
 526                  * Next strip any MSDU crypto bits.
 527                  */
 528                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 529                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 530                             ni->ni_macaddr, "data", "%s", "demic error");
 531                         vap->iv_stats.is_rx_demicfail++;
 532                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 533                         goto out;
 534                 }
 535
 536                 /* copy to listener after decrypt */
 537                 if (ieee80211_radiotap_active_vap(vap))
 538                         ieee80211_radiotap_rx(vap, m);
 539                 need_tap = 0;
 540
 541                 /*
 542                  * Finally, strip the 802.11 header.
 543                  */
 544                 m = ieee80211_decap(vap, m, hdrspace);
 545                 if (m == NULL) {
 546                         /* XXX mask bit to check for both */
 547                         /* don't count Null data frames as errors */
 548                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 549                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 550                                 goto out;
 551                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 552                             ni->ni_macaddr, "data", "%s", "decap error");
 553                         vap->iv_stats.is_rx_decap++;
 554                         IEEE80211_NODE_STAT(ni, rx_decap);
 555                         goto err;
 556                 }
 557                 eh = mtod(m, struct ether_header *);
 558                 if (!ieee80211_node_is_authorized(ni)) {
 559                         /*
 560                          * Deny any non-PAE frames received prior to
 561                          * authorization.  For open/shared-key
 562                          * authentication the port is mark authorized
 563                          * after authentication completes.  For 802.1x
 564                          * the port is not marked authorized by the
 565                          * authenticator until the handshake has completed.
 566                          */
 567                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 568                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 569                                     eh->ether_shost, "data",
 570                                     "unauthorized port: ether type 0x%x len %u",
 571                                     eh->ether_type, m->m_pkthdr.len);
 572                                 vap->iv_stats.is_rx_unauth++;
 573                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 574                                 goto err;
 575                         }
 576                 } else {
 577                         /*
 578                          * When denying unencrypted frames, discard
 579                          * any non-PAE frames received without encryption.
 580                          */
 581                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 582                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 583                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 584                                 /*
 585                                  * Drop unencrypted frames.
 586                                  */
 587                                 vap->iv_stats.is_rx_unencrypted++;
 588                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 589                                 goto out;
 590                         }
 591                 }
 592                 /* XXX require HT? */
 593                 if (qos & IEEE80211_QOS_AMSDU) {
 594                         m = ieee80211_decap_amsdu(ni, m);
 595                         if (m == NULL)
 596                                 return IEEE80211_FC0_TYPE_DATA;
 597                 } else {
 598 #ifdef IEEE80211_SUPPORT_SUPERG
 599                         m = ieee80211_decap_fastframe(vap, ni, m);
 600                         if (m == NULL)
 601                                 return IEEE80211_FC0_TYPE_DATA;
 602 #endif
 603                 }
 604                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 605                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 606                 else
 607                         ieee80211_deliver_data(vap, ni, m);
 608                 return IEEE80211_FC0_TYPE_DATA;
 609
 610         case IEEE80211_FC0_TYPE_MGT:
 611                 vap->iv_stats.is_rx_mgmt++;
 612                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 613                 if (dir != IEEE80211_FC1_DIR_NODS) {
 614                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 615                             wh, "data", "incorrect dir 0x%x", dir);
 616                         vap->iv_stats.is_rx_wrongdir++;
 617                         goto err;
 618                 }
 619                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 620                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 621                             ni->ni_macaddr, "mgt", "too short: len %u",
 622                             m->m_pkthdr.len);
 623                         vap->iv_stats.is_rx_tooshort++;
 624                         goto out;
 625                 }
 626 #ifdef IEEE80211_DEBUG
 627                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 628                     ieee80211_msg_dumppkts(vap)) {
 629                         if_printf(ifp, "received %s from %s rssi %d\n",
 630                             ieee80211_mgt_subtype_name[subtype >>
 631                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 632                             kether_ntoa(wh->i_addr2, ethstr), rssi);
 633                 }
 634 #endif
 635                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 636                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 637                             wh, NULL, "%s", "WEP set but not permitted");
 638                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 639                         goto out;
 640                 }
 641                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 642                 goto out;
 643
 644         case IEEE80211_FC0_TYPE_CTL:
 645                 vap->iv_stats.is_rx_ctl++;
 646                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 647                 vap->iv_recv_ctl(ni, m, subtype);
 648                 goto out;
 649
 650         default:
 651                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 652                     wh, "bad", "frame type 0x%x", type);
 653                 /* should not come here */
 654                 break;
 655         }
 656 err:
 657         IFNET_STAT_INC(ifp, ierrors, 1);
 658 out:
 659         if (m != NULL) {
 660                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 661                         ieee80211_radiotap_rx(vap, m);
 662                 m_freem(m);
 663         }
 664         return type;
 665 #undef SEQ_LEQ
 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, int rssi, int nf)
 688 {
 689         struct ieee80211vap *vap = ni->ni_vap;
 690         struct ieee80211com *ic = ni->ni_ic;
 691         struct ieee80211_frame *wh;
 692         uint8_t *frm, *efrm;
 693         uint8_t *ssid, *rates, *xrates;
 694
 695         wh = mtod(m0, struct ieee80211_frame *);
 696         frm = (uint8_t *)&wh[1];
 697         efrm = mtod(m0, uint8_t *) + m0->m_len;
 698         switch (subtype) {
 699         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 700         case IEEE80211_FC0_SUBTYPE_BEACON: {
 701                 struct ieee80211_scanparams scan;
 702                 /*
 703                  * We process beacon/probe response
 704                  * frames to discover neighbors.
 705                  */
 706                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 707                         return;
 708                 /*
 709                  * Count frame now that we know it's to be processed.
 710                  */
 711                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 712                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 713                         IEEE80211_NODE_STAT(ni, rx_beacons);
 714                 } else
 715                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 716                 /*
 717                  * If scanning, just pass information to the scan module.
 718                  */
 719                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 720                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 721                                 /*
 722                                  * Actively scanning a channel marked passive;
 723                                  * send a probe request now that we know there
 724                                  * is 802.11 traffic present.
 725                                  *
 726                                  * XXX check if the beacon we recv'd gives
 727                                  * us what we need and suppress the probe req
 728                                  */
 729                                 ieee80211_probe_curchan(vap, 1);
 730                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 731                         }
 732                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 733                         return;
 734                 }
 735                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 736                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 737                                 /*
 738                                  * Create a new entry in the neighbor table.
 739                                  */
 740                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 741                         } else if (ni->ni_capinfo == 0) {
 742                                 /*
 743                                  * Update faked node created on transmit.
 744                                  * Note this also updates the tsf.
 745                                  */
 746                                 ieee80211_init_neighbor(ni, wh, &scan);
 747                         } else {
 748                                 /*
 749                                  * Record tsf for potential resync.
 750                                  */
 751                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 752                                         sizeof(ni->ni_tstamp));
 753                         }
 754                         if (ni != NULL) {
 755                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 756                                 ni->ni_noise = nf;
 757                         }
 758                 }
 759                 break;
 760         }
 761
 762         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 763                 if (vap->iv_state != IEEE80211_S_RUN) {
 764                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 765                             wh, NULL, "wrong state %s",
 766                             ieee80211_state_name[vap->iv_state]);
 767                         vap->iv_stats.is_rx_mgtdiscard++;
 768                         return;
 769                 }
 770                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 771                         /* frame must be directed */
 772                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 773                             wh, NULL, "%s", "not unicast");
 774                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 775                         return;
 776                 }
 777
 778                 /*
 779                  * prreq frame format
 780                  *      [tlv] ssid
 781                  *      [tlv] supported rates
 782                  *      [tlv] extended supported rates
 783                  */
 784                 ssid = rates = xrates = NULL;
 785                 while (efrm - frm > 1) {
 786                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 787                         switch (*frm) {
 788                         case IEEE80211_ELEMID_SSID:
 789                                 ssid = frm;
 790                                 break;
 791                         case IEEE80211_ELEMID_RATES:
 792                                 rates = frm;
 793                                 break;
 794                         case IEEE80211_ELEMID_XRATES:
 795                                 xrates = frm;
 796                                 break;
 797                         }
 798                         frm += frm[1] + 2;
 799                 }
 800                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 801                 if (xrates != NULL)
 802                         IEEE80211_VERIFY_ELEMENT(xrates,
 803                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 804                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 805                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 806                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 807                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 808                             wh, NULL,
 809                             "%s", "no ssid with ssid suppression enabled");
 810                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 811                         return;
 812                 }
 813
 814                 /* XXX find a better class or define it's own */
 815                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 816                     "%s", "recv probe req");
 817                 /*
 818                  * Some legacy 11b clients cannot hack a complete
 819                  * probe response frame.  When the request includes
 820                  * only a bare-bones rate set, communicate this to
 821                  * the transmit side.
 822                  */
 823                 ieee80211_send_proberesp(vap, wh->i_addr2,
 824                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 825                 break;
 826
 827         case IEEE80211_FC0_SUBTYPE_ACTION: {
 828                 const struct ieee80211_action *ia;
 829
 830                 if (vap->iv_state != IEEE80211_S_RUN) {
 831                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 832                             wh, NULL, "wrong state %s",
 833                             ieee80211_state_name[vap->iv_state]);
 834                         vap->iv_stats.is_rx_mgtdiscard++;
 835                         return;
 836                 }
 837                 /*
 838                  * action frame format:
 839                  *      [1] category
 840                  *      [1] action
 841                  *      [tlv] parameters
 842                  */
 843                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 844                         sizeof(struct ieee80211_action), return);
 845                 ia = (const struct ieee80211_action *) frm;
 846
 847                 vap->iv_stats.is_rx_action++;
 848                 IEEE80211_NODE_STAT(ni, rx_action);
 849
 850                 /* verify frame payloads but defer processing */
 851                 /* XXX maybe push this to method */
 852                 switch (ia->ia_category) {
 853                 case IEEE80211_ACTION_CAT_BA:
 854                         switch (ia->ia_action) {
 855                         case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 856                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 857                                     sizeof(struct ieee80211_action_ba_addbarequest),
 858                                     return);
 859                                 break;
 860                         case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 861                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 862                                     sizeof(struct ieee80211_action_ba_addbaresponse),
 863                                     return);
 864                                 break;
 865                         case IEEE80211_ACTION_BA_DELBA:
 866                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 867                                     sizeof(struct ieee80211_action_ba_delba),
 868                                     return);
 869                                 break;
 870                         }
 871                         break;
 872                 case IEEE80211_ACTION_CAT_HT:
 873                         switch (ia->ia_action) {
 874                         case IEEE80211_ACTION_HT_TXCHWIDTH:
 875                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 876                                     sizeof(struct ieee80211_action_ht_txchwidth),
 877                                     return);
 878                                 break;
 879                         }
 880                         break;
 881                 }
 882                 ic->ic_recv_action(ni, wh, frm, efrm);
 883                 break;
 884         }
 885
 886         case IEEE80211_FC0_SUBTYPE_AUTH:
 887         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 888         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 889         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 890         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 891         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 892         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 893                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 894                      wh, NULL, "%s", "not handled");
 895                 vap->iv_stats.is_rx_mgtdiscard++;
 896                 return;
 897
 898         default:
 899                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 900                      wh, "mgt", "subtype 0x%x not handled", subtype);
 901                 vap->iv_stats.is_rx_badsubtype++;
 902                 break;
 903         }
 904 }
 905 #undef IEEE80211_VERIFY_LENGTH
 906 #undef IEEE80211_VERIFY_ELEMENT
 907
 908 static void
 909 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 910         int subtype, int rssi, int nf)
 911 {
 912         struct ieee80211vap *vap = ni->ni_vap;
 913         struct ieee80211com *ic = ni->ni_ic;
 914
 915         /*
 916          * Process management frames when scanning; useful for doing
 917          * a site-survey.
 918          */
 919         if (ic->ic_flags & IEEE80211_F_SCAN)
 920                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 921         else
 922                 vap->iv_stats.is_rx_mgtdiscard++;
 923 }
 924
 925 static void
 926 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
 927 {
 928 }