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  * $DragonFly$
  27  */
  28
  29 /*
  30  * IEEE 802.11 IBSS mode support.
  31  */
  32 #include "opt_inet.h"
  33 #include "opt_wlan.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/mbuf.h>
  38 #include <sys/malloc.h>
  39 #include <sys/kernel.h>
  40
  41 #include <sys/socket.h>
  42 #include <sys/sockio.h>
  43 #include <sys/endian.h>
  44 #include <sys/errno.h>
  45 #include <sys/proc.h>
  46 #include <sys/sysctl.h>
  47
  48 #include <net/if.h>
  49 #include <net/if_media.h>
  50 #include <net/if_llc.h>
  51 #include <net/ethernet.h>
  52 #include <net/route.h>
  53
  54 #include <net/bpf.h>
  55
  56 #include <netproto/802_11/ieee80211_var.h>
  57 #include <netproto/802_11/ieee80211_adhoc.h>
  58 #include <netproto/802_11/ieee80211_input.h>
  59 #ifdef IEEE80211_SUPPORT_SUPERG
  60 #include <netproto/802_11/ieee80211_superg.h>
  61 #endif
  62 #ifdef IEEE80211_SUPPORT_TDMA
  63 #include <netproto/802_11/ieee80211_tdma.h>
  64 #endif
  65
  66 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  67
  68 static  void adhoc_vattach(struct ieee80211vap *);
  69 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  70 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
  71 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  72         int subtype, int, int);
  73 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  74         int subtype, int, int);
  75 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  76
  77 void
  78 ieee80211_adhoc_attach(struct ieee80211com *ic)
  79 {
  80         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  81         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  82 }
  83
  84 void
  85 ieee80211_adhoc_detach(struct ieee80211com *ic)
  86 {
  87 }
  88
  89 static void
  90 adhoc_vdetach(struct ieee80211vap *vap)
  91 {
  92 }
  93
  94 static void
  95 adhoc_vattach(struct ieee80211vap *vap)
  96 {
  97         vap->iv_newstate = adhoc_newstate;
  98         vap->iv_input = adhoc_input;
  99         if (vap->iv_opmode == IEEE80211_M_IBSS)
 100                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 101         else
 102                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 103         vap->iv_recv_ctl = adhoc_recv_ctl;
 104         vap->iv_opdetach = adhoc_vdetach;
 105 #ifdef IEEE80211_SUPPORT_TDMA
 106         /*
 107          * Throw control to tdma support.  Note we do this
 108          * after setting up our callbacks so it can piggyback
 109          * on top of us.
 110          */
 111         if (vap->iv_caps & IEEE80211_C_TDMA)
 112                 ieee80211_tdma_vattach(vap);
 113 #endif
 114 }
 115
 116 static void
 117 sta_leave(void *arg, struct ieee80211_node *ni)
 118 {
 119         struct ieee80211vap *vap = arg;
 120
 121         if (ni->ni_vap == vap && ni != vap->iv_bss)
 122                 ieee80211_node_leave(ni);
 123 }
 124
 125 /*
 126  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 127  */
 128 static int
 129 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 130 {
 131         struct ieee80211com *ic = vap->iv_ic;
 132         struct ieee80211_node *ni;
 133         enum ieee80211_state ostate;
 134
 135         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 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 %6D ssid ",
 217                                     ni->ni_bssid, ":");
 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
 300         if (m->m_flags & M_AMPDU_MPDU) {
 301                 /*
 302                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 303                  * w/ M_AMPDU_MPDU marked have already passed through
 304                  * here but were received out of order and been held on
 305                  * the reorder queue.  When resubmitted they are marked
 306                  * with the M_AMPDU_MPDU flag and we can bypass most of
 307                  * the normal processing.
 308                  */
 309                 wh = mtod(m, struct ieee80211_frame *);
 310                 type = IEEE80211_FC0_TYPE_DATA;
 311                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 312                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 313                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 314                 goto resubmit_ampdu;
 315         }
 316
 317         KASSERT(ni != NULL, ("null node"));
 318         ni->ni_inact = ni->ni_inact_reload;
 319
 320         type = -1;                      /* undefined */
 321
 322         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 323                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 324                     ni->ni_macaddr, NULL,
 325                     "too short (1): len %u", m->m_pkthdr.len);
 326                 vap->iv_stats.is_rx_tooshort++;
 327                 goto out;
 328         }
 329         /*
 330          * Bit of a cheat here, we use a pointer for a 3-address
 331          * frame format but don't reference fields past outside
 332          * ieee80211_frame_min w/o first validating the data is
 333          * present.
 334          */
 335         wh = mtod(m, struct ieee80211_frame *);
 336
 337         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 338             IEEE80211_FC0_VERSION_0) {
 339                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 340                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 341                     wh->i_fc[0], wh->i_fc[1]);
 342                 vap->iv_stats.is_rx_badversion++;
 343                 goto err;
 344         }
 345
 346         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 347         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 348         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 349         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 350                 if (dir != IEEE80211_FC1_DIR_NODS)
 351                         bssid = wh->i_addr1;
 352                 else if (type == IEEE80211_FC0_TYPE_CTL)
 353                         bssid = wh->i_addr1;
 354                 else {
 355                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 356                                 IEEE80211_DISCARD_MAC(vap,
 357                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 358                                     NULL, "too short (2): len %u",
 359                                     m->m_pkthdr.len);
 360                                 vap->iv_stats.is_rx_tooshort++;
 361                                 goto out;
 362                         }
 363                         bssid = wh->i_addr3;
 364                 }
 365                 /*
 366                  * Validate the bssid.
 367                  */
 368                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 369                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 370                         /* not interested in */
 371                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 372                             bssid, NULL, "%s", "not to bss");
 373                         vap->iv_stats.is_rx_wrongbss++;
 374                         goto out;
 375                 }
 376                 /*
 377                  * Data frame, cons up a node when it doesn't
 378                  * exist. This should probably done after an ACL check.
 379                  */
 380                 if (type == IEEE80211_FC0_TYPE_DATA &&
 381                     ni == vap->iv_bss &&
 382                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 383                         /*
 384                          * Beware of frames that come in too early; we
 385                          * can receive broadcast frames and creating sta
 386                          * entries will blow up because there is no bss
 387                          * channel yet.
 388                          */
 389                         if (vap->iv_state != IEEE80211_S_RUN) {
 390                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 391                                     wh, "data", "not in RUN state (%s)",
 392                                     ieee80211_state_name[vap->iv_state]);
 393                                 vap->iv_stats.is_rx_badstate++;
 394                                 goto err;
 395                         }
 396                         /*
 397                          * Fake up a node for this newly
 398                          * discovered member of the IBSS.
 399                          */
 400                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 401                         if (ni == NULL) {
 402                                 /* NB: stat kept for alloc failure */
 403                                 goto err;
 404                         }
 405                 }
 406                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 407                 ni->ni_noise = nf;
 408                 if (HAS_SEQ(type)) {
 409                         uint8_t tid = ieee80211_gettid(wh);
 410                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 411                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 412                                 ic->ic_wme.wme_hipri_traffic++;
 413                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 414                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 415                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 416                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 417                                 /* duplicate, discard */
 418                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 419                                     bssid, "duplicate",
 420                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 421                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 422                                     ni->ni_rxseqs[tid] >>
 423                                         IEEE80211_SEQ_SEQ_SHIFT,
 424                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 425                                     ni->ni_rxseqs[tid] &
 426                                         IEEE80211_SEQ_FRAG_MASK,
 427                                     tid);
 428                                 vap->iv_stats.is_rx_dup++;
 429                                 IEEE80211_NODE_STAT(ni, rx_dup);
 430                                 goto out;
 431                         }
 432                         ni->ni_rxseqs[tid] = rxseq;
 433                 }
 434         }
 435
 436         switch (type) {
 437         case IEEE80211_FC0_TYPE_DATA:
 438                 hdrspace = ieee80211_hdrspace(ic, wh);
 439                 if (m->m_len < hdrspace &&
 440                     (m = m_pullup(m, hdrspace)) == NULL) {
 441                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 442                             ni->ni_macaddr, NULL,
 443                             "data too short: expecting %u", hdrspace);
 444                         vap->iv_stats.is_rx_tooshort++;
 445                         goto out;               /* XXX */
 446                 }
 447                 if (dir != IEEE80211_FC1_DIR_NODS) {
 448                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 449                             wh, "data", "incorrect dir 0x%x", dir);
 450                         vap->iv_stats.is_rx_wrongdir++;
 451                         goto out;
 452                 }
 453                 /* XXX no power-save support */
 454
 455                 /*
 456                  * Handle A-MPDU re-ordering.  If the frame is to be
 457                  * processed directly then ieee80211_ampdu_reorder
 458                  * will return 0; otherwise it has consumed the mbuf
 459                  * and we should do nothing more with it.
 460                  */
 461                 if ((m->m_flags & M_AMPDU) &&
 462                     ieee80211_ampdu_reorder(ni, m) != 0) {
 463                         m = NULL;
 464                         goto out;
 465                 }
 466         resubmit_ampdu:
 467
 468                 /*
 469                  * Handle privacy requirements.  Note that we
 470                  * must not be preempted from here until after
 471                  * we (potentially) call ieee80211_crypto_demic;
 472                  * otherwise we may violate assumptions in the
 473                  * crypto cipher modules used to do delayed update
 474                  * of replay sequence numbers.
 475                  */
 476                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 477                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 478                                 /*
 479                                  * Discard encrypted frames when privacy is off.
 480                                  */
 481                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 482                                     wh, "WEP", "%s", "PRIVACY off");
 483                                 vap->iv_stats.is_rx_noprivacy++;
 484                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 485                                 goto out;
 486                         }
 487                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 488                         if (key == NULL) {
 489                                 /* NB: stats+msgs handled in crypto_decap */
 490                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 491                                 goto out;
 492                         }
 493                         wh = mtod(m, struct ieee80211_frame *);
 494                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 495                 } else {
 496                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 497                         key = NULL;
 498                 }
 499
 500                 /*
 501                  * Save QoS bits for use below--before we strip the header.
 502                  */
 503                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 504                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 505                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 506                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 507                 } else
 508                         qos = 0;
 509
 510                 /*
 511                  * Next up, any fragmentation.
 512                  */
 513                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 514                         m = ieee80211_defrag(ni, m, hdrspace);
 515                         if (m == NULL) {
 516                                 /* Fragment dropped or frame not complete yet */
 517                                 goto out;
 518                         }
 519                 }
 520                 wh = NULL;              /* no longer valid, catch any uses */
 521
 522                 /*
 523                  * Next strip any MSDU crypto bits.
 524                  */
 525                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 526                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 527                             ni->ni_macaddr, "data", "%s", "demic error");
 528                         vap->iv_stats.is_rx_demicfail++;
 529                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 530                         goto out;
 531                 }
 532
 533                 /* copy to listener after decrypt */
 534                 if (ieee80211_radiotap_active_vap(vap))
 535                         ieee80211_radiotap_rx(vap, m);
 536                 need_tap = 0;
 537
 538                 /*
 539                  * Finally, strip the 802.11 header.
 540                  */
 541                 m = ieee80211_decap(vap, m, hdrspace);
 542                 if (m == NULL) {
 543                         /* XXX mask bit to check for both */
 544                         /* don't count Null data frames as errors */
 545                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 546                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 547                                 goto out;
 548                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 549                             ni->ni_macaddr, "data", "%s", "decap error");
 550                         vap->iv_stats.is_rx_decap++;
 551                         IEEE80211_NODE_STAT(ni, rx_decap);
 552                         goto err;
 553                 }
 554                 eh = mtod(m, struct ether_header *);
 555                 if (!ieee80211_node_is_authorized(ni)) {
 556                         /*
 557                          * Deny any non-PAE frames received prior to
 558                          * authorization.  For open/shared-key
 559                          * authentication the port is mark authorized
 560                          * after authentication completes.  For 802.1x
 561                          * the port is not marked authorized by the
 562                          * authenticator until the handshake has completed.
 563                          */
 564                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 565                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 566                                     eh->ether_shost, "data",
 567                                     "unauthorized port: ether type 0x%x len %u",
 568                                     eh->ether_type, m->m_pkthdr.len);
 569                                 vap->iv_stats.is_rx_unauth++;
 570                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 571                                 goto err;
 572                         }
 573                 } else {
 574                         /*
 575                          * When denying unencrypted frames, discard
 576                          * any non-PAE frames received without encryption.
 577                          */
 578                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 579                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 580                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 581                                 /*
 582                                  * Drop unencrypted frames.
 583                                  */
 584                                 vap->iv_stats.is_rx_unencrypted++;
 585                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 586                                 goto out;
 587                         }
 588                 }
 589                 /* XXX require HT? */
 590                 if (qos & IEEE80211_QOS_AMSDU) {
 591                         m = ieee80211_decap_amsdu(ni, m);
 592                         if (m == NULL)
 593                                 return IEEE80211_FC0_TYPE_DATA;
 594                 } else {
 595 #ifdef IEEE80211_SUPPORT_SUPERG
 596                         m = ieee80211_decap_fastframe(vap, ni, m);
 597                         if (m == NULL)
 598                                 return IEEE80211_FC0_TYPE_DATA;
 599 #endif
 600                 }
 601                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 602                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 603                 else
 604                         ieee80211_deliver_data(vap, ni, m);
 605                 return IEEE80211_FC0_TYPE_DATA;
 606
 607         case IEEE80211_FC0_TYPE_MGT:
 608                 vap->iv_stats.is_rx_mgmt++;
 609                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 610                 if (dir != IEEE80211_FC1_DIR_NODS) {
 611                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 612                             wh, "data", "incorrect dir 0x%x", dir);
 613                         vap->iv_stats.is_rx_wrongdir++;
 614                         goto err;
 615                 }
 616                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 617                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 618                             ni->ni_macaddr, "mgt", "too short: len %u",
 619                             m->m_pkthdr.len);
 620                         vap->iv_stats.is_rx_tooshort++;
 621                         goto out;
 622                 }
 623 #ifdef IEEE80211_DEBUG
 624                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 625                     ieee80211_msg_dumppkts(vap)) {
 626                         if_printf(ifp, "received %s from %6D rssi %d\n",
 627                             ieee80211_mgt_subtype_name[subtype >>
 628                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 629                             wh->i_addr2, ":", rssi);
 630                 }
 631 #endif
 632                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 633                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 634                             wh, NULL, "%s", "WEP set but not permitted");
 635                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 636                         goto out;
 637                 }
 638                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 639                 goto out;
 640
 641         case IEEE80211_FC0_TYPE_CTL:
 642                 vap->iv_stats.is_rx_ctl++;
 643                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 644                 vap->iv_recv_ctl(ni, m, subtype);
 645                 goto out;
 646
 647         default:
 648                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 649                     wh, "bad", "frame type 0x%x", type);
 650                 /* should not come here */
 651                 break;
 652         }
 653 err:
 654         ifp->if_ierrors++;
 655 out:
 656         if (m != NULL) {
 657                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 658                         ieee80211_radiotap_rx(vap, m);
 659                 m_freem(m);
 660         }
 661         return type;
 662 #undef SEQ_LEQ
 663 }
 664
 665 static int
 666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 667 {
 668         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 669         int i;
 670
 671         /* NB: the 11b clients we care about will not have xrates */
 672         if (xrates != NULL || rates == NULL)
 673                 return 0;
 674         for (i = 0; i < rates[1]; i++) {
 675                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 676                 if (r > 2*11 || ((1<<r) & brates) == 0)
 677                         return 0;
 678         }
 679         return 1;
 680 }
 681
 682 static void
 683 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 684         int subtype, int rssi, int nf)
 685 {
 686         struct ieee80211vap *vap = ni->ni_vap;
 687         struct ieee80211com *ic = ni->ni_ic;
 688         struct ieee80211_frame *wh;
 689         uint8_t *frm, *efrm, *sfrm;
 690         uint8_t *ssid, *rates, *xrates;
 691
 692         wh = mtod(m0, struct ieee80211_frame *);
 693         frm = (uint8_t *)&wh[1];
 694         efrm = mtod(m0, uint8_t *) + m0->m_len;
 695         switch (subtype) {
 696         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 697         case IEEE80211_FC0_SUBTYPE_BEACON: {
 698                 struct ieee80211_scanparams scan;
 699                 /*
 700                  * We process beacon/probe response
 701                  * frames to discover neighbors.
 702                  */
 703                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 704                         return;
 705                 /*
 706                  * Count frame now that we know it's to be processed.
 707                  */
 708                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 709                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 710                         IEEE80211_NODE_STAT(ni, rx_beacons);
 711                 } else
 712                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 713                 /*
 714                  * If scanning, just pass information to the scan module.
 715                  */
 716                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 717                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 718                                 /*
 719                                  * Actively scanning a channel marked passive;
 720                                  * send a probe request now that we know there
 721                                  * is 802.11 traffic present.
 722                                  *
 723                                  * XXX check if the beacon we recv'd gives
 724                                  * us what we need and suppress the probe req
 725                                  */
 726                                 ieee80211_probe_curchan(vap, 1);
 727                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 728                         }
 729                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 730                         return;
 731                 }
 732                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 733                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 734                                 /*
 735                                  * Create a new entry in the neighbor table.
 736                                  */
 737                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 738                         } else if (ni->ni_capinfo == 0) {
 739                                 /*
 740                                  * Update faked node created on transmit.
 741                                  * Note this also updates the tsf.
 742                                  */
 743                                 ieee80211_init_neighbor(ni, wh, &scan);
 744                         } else {
 745                                 /*
 746                                  * Record tsf for potential resync.
 747                                  */
 748                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 749                                         sizeof(ni->ni_tstamp));
 750                         }
 751                         if (ni != NULL) {
 752                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 753                                 ni->ni_noise = nf;
 754                         }
 755                 }
 756                 break;
 757         }
 758
 759         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 760                 if (vap->iv_state != IEEE80211_S_RUN) {
 761                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 762                             wh, NULL, "wrong state %s",
 763                             ieee80211_state_name[vap->iv_state]);
 764                         vap->iv_stats.is_rx_mgtdiscard++;
 765                         return;
 766                 }
 767                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 768                         /* frame must be directed */
 769                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 770                             wh, NULL, "%s", "not unicast");
 771                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 772                         return;
 773                 }
 774
 775                 /*
 776                  * prreq frame format
 777                  *      [tlv] ssid
 778                  *      [tlv] supported rates
 779                  *      [tlv] extended supported rates
 780                  */
 781                 ssid = rates = xrates = NULL;
 782                 sfrm = frm;
 783                 while (efrm - frm > 1) {
 784                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 785                         switch (*frm) {
 786                         case IEEE80211_ELEMID_SSID:
 787                                 ssid = frm;
 788                                 break;
 789                         case IEEE80211_ELEMID_RATES:
 790                                 rates = frm;
 791                                 break;
 792                         case IEEE80211_ELEMID_XRATES:
 793                                 xrates = frm;
 794                                 break;
 795                         }
 796                         frm += frm[1] + 2;
 797                 }
 798                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 799                 if (xrates != NULL)
 800                         IEEE80211_VERIFY_ELEMENT(xrates,
 801                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 802                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 803                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 804                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 805                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 806                             wh, NULL,
 807                             "%s", "no ssid with ssid suppression enabled");
 808                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 809                         return;
 810                 }
 811
 812                 /* XXX find a better class or define it's own */
 813                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 814                     "%s", "recv probe req");
 815                 /*
 816                  * Some legacy 11b clients cannot hack a complete
 817                  * probe response frame.  When the request includes
 818                  * only a bare-bones rate set, communicate this to
 819                  * the transmit side.
 820                  */
 821                 ieee80211_send_proberesp(vap, wh->i_addr2,
 822                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 823                 break;
 824
 825         case IEEE80211_FC0_SUBTYPE_ACTION: {
 826                 const struct ieee80211_action *ia;
 827
 828                 if (vap->iv_state != IEEE80211_S_RUN) {
 829                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 830                             wh, NULL, "wrong state %s",
 831                             ieee80211_state_name[vap->iv_state]);
 832                         vap->iv_stats.is_rx_mgtdiscard++;
 833                         return;
 834                 }
 835                 /*
 836                  * action frame format:
 837                  *      [1] category
 838                  *      [1] action
 839                  *      [tlv] parameters
 840                  */
 841                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 842                         sizeof(struct ieee80211_action), return);
 843                 ia = (const struct ieee80211_action *) frm;
 844
 845                 vap->iv_stats.is_rx_action++;
 846                 IEEE80211_NODE_STAT(ni, rx_action);
 847
 848                 /* verify frame payloads but defer processing */
 849                 /* XXX maybe push this to method */
 850                 switch (ia->ia_category) {
 851                 case IEEE80211_ACTION_CAT_BA:
 852                         switch (ia->ia_action) {
 853                         case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 854                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 855                                     sizeof(struct ieee80211_action_ba_addbarequest),
 856                                     return);
 857                                 break;
 858                         case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 859                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 860                                     sizeof(struct ieee80211_action_ba_addbaresponse),
 861                                     return);
 862                                 break;
 863                         case IEEE80211_ACTION_BA_DELBA:
 864                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 865                                     sizeof(struct ieee80211_action_ba_delba),
 866                                     return);
 867                                 break;
 868                         }
 869                         break;
 870                 case IEEE80211_ACTION_CAT_HT:
 871                         switch (ia->ia_action) {
 872                         case IEEE80211_ACTION_HT_TXCHWIDTH:
 873                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 874                                     sizeof(struct ieee80211_action_ht_txchwidth),
 875                                     return);
 876                                 break;
 877                         }
 878                         break;
 879                 }
 880                 ic->ic_recv_action(ni, wh, frm, efrm);
 881                 break;
 882         }
 883
 884         case IEEE80211_FC0_SUBTYPE_AUTH:
 885         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 886         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 887         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 888         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 889         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 890         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 891                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 892                      wh, NULL, "%s", "not handled");
 893                 vap->iv_stats.is_rx_mgtdiscard++;
 894                 return;
 895
 896         default:
 897                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 898                      wh, "mgt", "subtype 0x%x not handled", subtype);
 899                 vap->iv_stats.is_rx_badsubtype++;
 900                 break;
 901         }
 902 }
 903 #undef IEEE80211_VERIFY_LENGTH
 904 #undef IEEE80211_VERIFY_ELEMENT
 905
 906 static void
 907 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 908         int subtype, int rssi, int nf)
 909 {
 910         struct ieee80211vap *vap = ni->ni_vap;
 911         struct ieee80211com *ic = ni->ni_ic;
 912
 913         /*
 914          * Process management frames when scanning; useful for doing
 915          * a site-survey.
 916          */
 917         if (ic->ic_flags & IEEE80211_F_SCAN)
 918                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 919         else
 920                 vap->iv_stats.is_rx_mgtdiscard++;
 921 }
 922
 923 static void
 924 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
 925 {
 926 }