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         ostate = vap->iv_state;
 136         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 137             __func__, ieee80211_state_name[ostate],
 138             ieee80211_state_name[nstate], arg);
 139         vap->iv_state = nstate;                 /* state transition */
 140         if (ostate != IEEE80211_S_SCAN)
 141                 ieee80211_cancel_scan(vap);     /* background scan */
 142         ni = vap->iv_bss;                       /* NB: no reference held */
 143         switch (nstate) {
 144         case IEEE80211_S_INIT:
 145                 switch (ostate) {
 146                 case IEEE80211_S_SCAN:
 147                         ieee80211_cancel_scan(vap);
 148                         break;
 149                 default:
 150                         break;
 151                 }
 152                 if (ostate != IEEE80211_S_INIT) {
 153                         /* NB: optimize INIT -> INIT case */
 154                         ieee80211_reset_bss(vap);
 155                 }
 156                 break;
 157         case IEEE80211_S_SCAN:
 158                 switch (ostate) {
 159                 case IEEE80211_S_RUN:           /* beacon miss */
 160                         /* purge station table; entries are stale */
 161                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 162                         /* fall thru... */
 163                 case IEEE80211_S_INIT:
 164                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 165                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 166                                 /*
 167                                  * Already have a channel; bypass the
 168                                  * scan and startup immediately.
 169                                  */
 170                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 171                                 break;
 172                         }
 173                         /*
 174                          * Initiate a scan.  We can come here as a result
 175                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 176                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 177                          * and the scan request parameters will be present
 178                          * in iv_scanreq.  Otherwise we do the default.
 179                          */
 180                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 181                                 ieee80211_check_scan(vap,
 182                                     vap->iv_scanreq_flags,
 183                                     vap->iv_scanreq_duration,
 184                                     vap->iv_scanreq_mindwell,
 185                                     vap->iv_scanreq_maxdwell,
 186                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 187                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 188                         } else
 189                                 ieee80211_check_scan_current(vap);
 190                         break;
 191                 case IEEE80211_S_SCAN:
 192                         /*
 193                          * This can happen because of a change in state
 194                          * that requires a reset.  Trigger a new scan
 195                          * unless we're in manual roaming mode in which
 196                          * case an application must issue an explicit request.
 197                          */
 198                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 199                                 ieee80211_check_scan_current(vap);
 200                         break;
 201                 default:
 202                         goto invalid;
 203                 }
 204                 break;
 205         case IEEE80211_S_RUN:
 206                 if (vap->iv_flags & IEEE80211_F_WPA) {
 207                         /* XXX validate prerequisites */
 208                 }
 209                 switch (ostate) {
 210                 case IEEE80211_S_SCAN:
 211 #ifdef IEEE80211_DEBUG
 212                         if (ieee80211_msg_debug(vap)) {
 213                                 ieee80211_note(vap,
 214                                     "synchronized with %6D ssid ",
 215                                     ni->ni_bssid, ":");
 216                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 217                                     ni->ni_esslen);
 218                                 /* XXX MCS/HT */
 219                                 kprintf(" channel %d start %uMb\n",
 220                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 221                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 222                         }
 223 #endif
 224                         break;
 225                 default:
 226                         goto invalid;
 227                 }
 228                 /*
 229                  * When 802.1x is not in use mark the port authorized
 230                  * at this point so traffic can flow.
 231                  */
 232                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 233                         ieee80211_node_authorize(ni);
 234                 /*
 235                  * Fake association when joining an existing bss.
 236                  */
 237                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 238                     ic->ic_newassoc != NULL)
 239                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 240                 break;
 241         case IEEE80211_S_SLEEP:
 242                 ieee80211_sta_pwrsave(vap, 0);
 243                 break;
 244         default:
 245         invalid:
 246                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 247                     "%s: unexpected state transition %s -> %s\n", __func__,
 248                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 249                 break;
 250         }
 251         return 0;
 252 }
 253
 254 /*
 255  * Decide if a received management frame should be
 256  * printed when debugging is enabled.  This filters some
 257  * of the less interesting frames that come frequently
 258  * (e.g. beacons).
 259  */
 260 static __inline int
 261 doprint(struct ieee80211vap *vap, int subtype)
 262 {
 263         switch (subtype) {
 264         case IEEE80211_FC0_SUBTYPE_BEACON:
 265                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 266         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 267                 return 1;
 268         }
 269         return 1;
 270 }
 271
 272 /*
 273  * Process a received frame.  The node associated with the sender
 274  * should be supplied.  If nothing was found in the node table then
 275  * the caller is assumed to supply a reference to iv_bss instead.
 276  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 277  * during AP scanning to select a AP to associate with; it can have
 278  * any units so long as values have consistent units and higher values
 279  * mean ``better signal''.  The receive timestamp is currently not used
 280  * by the 802.11 layer.
 281  */
 282 static int
 283 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 284 {
 285 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 286 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 287         struct ieee80211vap *vap = ni->ni_vap;
 288         struct ieee80211com *ic = ni->ni_ic;
 289         struct ifnet *ifp = vap->iv_ifp;
 290         struct ieee80211_frame *wh;
 291         struct ieee80211_key *key;
 292         struct ether_header *eh;
 293         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 294         uint8_t dir, type, subtype, qos;
 295         uint8_t *bssid;
 296         uint16_t rxseq;
 297
 298         if (m->m_flags & M_AMPDU_MPDU) {
 299                 /*
 300                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 301                  * w/ M_AMPDU_MPDU marked have already passed through
 302                  * here but were received out of order and been held on
 303                  * the reorder queue.  When resubmitted they are marked
 304                  * with the M_AMPDU_MPDU flag and we can bypass most of
 305                  * the normal processing.
 306                  */
 307                 wh = mtod(m, struct ieee80211_frame *);
 308                 type = IEEE80211_FC0_TYPE_DATA;
 309                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 310                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 311                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 312                 goto resubmit_ampdu;
 313         }
 314
 315         KASSERT(ni != NULL, ("null node"));
 316         ni->ni_inact = ni->ni_inact_reload;
 317
 318         type = -1;                      /* undefined */
 319
 320         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 321                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 322                     ni->ni_macaddr, NULL,
 323                     "too short (1): len %u", m->m_pkthdr.len);
 324                 vap->iv_stats.is_rx_tooshort++;
 325                 goto out;
 326         }
 327         /*
 328          * Bit of a cheat here, we use a pointer for a 3-address
 329          * frame format but don't reference fields past outside
 330          * ieee80211_frame_min w/o first validating the data is
 331          * present.
 332          */
 333         wh = mtod(m, struct ieee80211_frame *);
 334
 335         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 336             IEEE80211_FC0_VERSION_0) {
 337                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 338                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 339                     wh->i_fc[0], wh->i_fc[1]);
 340                 vap->iv_stats.is_rx_badversion++;
 341                 goto err;
 342         }
 343
 344         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 345         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 346         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 347         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 348                 if (dir != IEEE80211_FC1_DIR_NODS)
 349                         bssid = wh->i_addr1;
 350                 else if (type == IEEE80211_FC0_TYPE_CTL)
 351                         bssid = wh->i_addr1;
 352                 else {
 353                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 354                                 IEEE80211_DISCARD_MAC(vap,
 355                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 356                                     NULL, "too short (2): len %u",
 357                                     m->m_pkthdr.len);
 358                                 vap->iv_stats.is_rx_tooshort++;
 359                                 goto out;
 360                         }
 361                         bssid = wh->i_addr3;
 362                 }
 363                 /*
 364                  * Validate the bssid.
 365                  */
 366                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 367                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 368                         /* not interested in */
 369                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 370                             bssid, NULL, "%s", "not to bss");
 371                         vap->iv_stats.is_rx_wrongbss++;
 372                         goto out;
 373                 }
 374                 /*
 375                  * Data frame, cons up a node when it doesn't
 376                  * exist. This should probably done after an ACL check.
 377                  */
 378                 if (type == IEEE80211_FC0_TYPE_DATA &&
 379                     ni == vap->iv_bss &&
 380                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 381                         /*
 382                          * Beware of frames that come in too early; we
 383                          * can receive broadcast frames and creating sta
 384                          * entries will blow up because there is no bss
 385                          * channel yet.
 386                          */
 387                         if (vap->iv_state != IEEE80211_S_RUN) {
 388                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 389                                     wh, "data", "not in RUN state (%s)",
 390                                     ieee80211_state_name[vap->iv_state]);
 391                                 vap->iv_stats.is_rx_badstate++;
 392                                 goto err;
 393                         }
 394                         /*
 395                          * Fake up a node for this newly
 396                          * discovered member of the IBSS.
 397                          */
 398                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 399                         if (ni == NULL) {
 400                                 /* NB: stat kept for alloc failure */
 401                                 goto err;
 402                         }
 403                 }
 404                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 405                 ni->ni_noise = nf;
 406                 if (HAS_SEQ(type)) {
 407                         uint8_t tid = ieee80211_gettid(wh);
 408                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 409                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 410                                 ic->ic_wme.wme_hipri_traffic++;
 411                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 412                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 413                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 414                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 415                                 /* duplicate, discard */
 416                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 417                                     bssid, "duplicate",
 418                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 419                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 420                                     ni->ni_rxseqs[tid] >>
 421                                         IEEE80211_SEQ_SEQ_SHIFT,
 422                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 423                                     ni->ni_rxseqs[tid] &
 424                                         IEEE80211_SEQ_FRAG_MASK,
 425                                     tid);
 426                                 vap->iv_stats.is_rx_dup++;
 427                                 IEEE80211_NODE_STAT(ni, rx_dup);
 428                                 goto out;
 429                         }
 430                         ni->ni_rxseqs[tid] = rxseq;
 431                 }
 432         }
 433
 434         switch (type) {
 435         case IEEE80211_FC0_TYPE_DATA:
 436                 hdrspace = ieee80211_hdrspace(ic, wh);
 437                 if (m->m_len < hdrspace &&
 438                     (m = m_pullup(m, hdrspace)) == NULL) {
 439                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 440                             ni->ni_macaddr, NULL,
 441                             "data too short: expecting %u", hdrspace);
 442                         vap->iv_stats.is_rx_tooshort++;
 443                         goto out;               /* XXX */
 444                 }
 445                 if (dir != IEEE80211_FC1_DIR_NODS) {
 446                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 447                             wh, "data", "incorrect dir 0x%x", dir);
 448                         vap->iv_stats.is_rx_wrongdir++;
 449                         goto out;
 450                 }
 451                 /* XXX no power-save support */
 452
 453                 /*
 454                  * Handle A-MPDU re-ordering.  If the frame is to be
 455                  * processed directly then ieee80211_ampdu_reorder
 456                  * will return 0; otherwise it has consumed the mbuf
 457                  * and we should do nothing more with it.
 458                  */
 459                 if ((m->m_flags & M_AMPDU) &&
 460                     ieee80211_ampdu_reorder(ni, m) != 0) {
 461                         m = NULL;
 462                         goto out;
 463                 }
 464         resubmit_ampdu:
 465
 466                 /*
 467                  * Handle privacy requirements.  Note that we
 468                  * must not be preempted from here until after
 469                  * we (potentially) call ieee80211_crypto_demic;
 470                  * otherwise we may violate assumptions in the
 471                  * crypto cipher modules used to do delayed update
 472                  * of replay sequence numbers.
 473                  */
 474                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 475                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 476                                 /*
 477                                  * Discard encrypted frames when privacy is off.
 478                                  */
 479                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 480                                     wh, "WEP", "%s", "PRIVACY off");
 481                                 vap->iv_stats.is_rx_noprivacy++;
 482                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 483                                 goto out;
 484                         }
 485                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 486                         if (key == NULL) {
 487                                 /* NB: stats+msgs handled in crypto_decap */
 488                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 489                                 goto out;
 490                         }
 491                         wh = mtod(m, struct ieee80211_frame *);
 492                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 493                 } else {
 494                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 495                         key = NULL;
 496                 }
 497
 498                 /*
 499                  * Save QoS bits for use below--before we strip the header.
 500                  */
 501                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 502                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 503                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 504                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 505                 } else
 506                         qos = 0;
 507
 508                 /*
 509                  * Next up, any fragmentation.
 510                  */
 511                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 512                         m = ieee80211_defrag(ni, m, hdrspace);
 513                         if (m == NULL) {
 514                                 /* Fragment dropped or frame not complete yet */
 515                                 goto out;
 516                         }
 517                 }
 518                 wh = NULL;              /* no longer valid, catch any uses */
 519
 520                 /*
 521                  * Next strip any MSDU crypto bits.
 522                  */
 523                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 524                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 525                             ni->ni_macaddr, "data", "%s", "demic error");
 526                         vap->iv_stats.is_rx_demicfail++;
 527                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 528                         goto out;
 529                 }
 530
 531                 /* copy to listener after decrypt */
 532                 if (ieee80211_radiotap_active_vap(vap))
 533                         ieee80211_radiotap_rx(vap, m);
 534                 need_tap = 0;
 535
 536                 /*
 537                  * Finally, strip the 802.11 header.
 538                  */
 539                 m = ieee80211_decap(vap, m, hdrspace);
 540                 if (m == NULL) {
 541                         /* XXX mask bit to check for both */
 542                         /* don't count Null data frames as errors */
 543                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 544                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 545                                 goto out;
 546                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 547                             ni->ni_macaddr, "data", "%s", "decap error");
 548                         vap->iv_stats.is_rx_decap++;
 549                         IEEE80211_NODE_STAT(ni, rx_decap);
 550                         goto err;
 551                 }
 552                 eh = mtod(m, struct ether_header *);
 553                 if (!ieee80211_node_is_authorized(ni)) {
 554                         /*
 555                          * Deny any non-PAE frames received prior to
 556                          * authorization.  For open/shared-key
 557                          * authentication the port is mark authorized
 558                          * after authentication completes.  For 802.1x
 559                          * the port is not marked authorized by the
 560                          * authenticator until the handshake has completed.
 561                          */
 562                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 563                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 564                                     eh->ether_shost, "data",
 565                                     "unauthorized port: ether type 0x%x len %u",
 566                                     eh->ether_type, m->m_pkthdr.len);
 567                                 vap->iv_stats.is_rx_unauth++;
 568                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 569                                 goto err;
 570                         }
 571                 } else {
 572                         /*
 573                          * When denying unencrypted frames, discard
 574                          * any non-PAE frames received without encryption.
 575                          */
 576                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 577                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 578                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 579                                 /*
 580                                  * Drop unencrypted frames.
 581                                  */
 582                                 vap->iv_stats.is_rx_unencrypted++;
 583                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 584                                 goto out;
 585                         }
 586                 }
 587                 /* XXX require HT? */
 588                 if (qos & IEEE80211_QOS_AMSDU) {
 589                         m = ieee80211_decap_amsdu(ni, m);
 590                         if (m == NULL)
 591                                 return IEEE80211_FC0_TYPE_DATA;
 592                 } else {
 593 #ifdef IEEE80211_SUPPORT_SUPERG
 594                         m = ieee80211_decap_fastframe(vap, ni, m);
 595                         if (m == NULL)
 596                                 return IEEE80211_FC0_TYPE_DATA;
 597 #endif
 598                 }
 599                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 600                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 601                 else
 602                         ieee80211_deliver_data(vap, ni, m);
 603                 return IEEE80211_FC0_TYPE_DATA;
 604
 605         case IEEE80211_FC0_TYPE_MGT:
 606                 vap->iv_stats.is_rx_mgmt++;
 607                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 608                 if (dir != IEEE80211_FC1_DIR_NODS) {
 609                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 610                             wh, "data", "incorrect dir 0x%x", dir);
 611                         vap->iv_stats.is_rx_wrongdir++;
 612                         goto err;
 613                 }
 614                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 615                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 616                             ni->ni_macaddr, "mgt", "too short: len %u",
 617                             m->m_pkthdr.len);
 618                         vap->iv_stats.is_rx_tooshort++;
 619                         goto out;
 620                 }
 621 #ifdef IEEE80211_DEBUG
 622                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 623                     ieee80211_msg_dumppkts(vap)) {
 624                         if_printf(ifp, "received %s from %6D rssi %d\n",
 625                             ieee80211_mgt_subtype_name[subtype >>
 626                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 627                             wh->i_addr2, ":", rssi);
 628                 }
 629 #endif
 630                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 631                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 632                             wh, NULL, "%s", "WEP set but not permitted");
 633                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 634                         goto out;
 635                 }
 636                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 637                 goto out;
 638
 639         case IEEE80211_FC0_TYPE_CTL:
 640                 vap->iv_stats.is_rx_ctl++;
 641                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 642                 vap->iv_recv_ctl(ni, m, subtype);
 643                 goto out;
 644
 645         default:
 646                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 647                     wh, "bad", "frame type 0x%x", type);
 648                 /* should not come here */
 649                 break;
 650         }
 651 err:
 652         ifp->if_ierrors++;
 653 out:
 654         if (m != NULL) {
 655                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 656                         ieee80211_radiotap_rx(vap, m);
 657                 m_freem(m);
 658         }
 659         return type;
 660 #undef SEQ_LEQ
 661 }
 662
 663 static int
 664 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 665 {
 666         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 667         int i;
 668
 669         /* NB: the 11b clients we care about will not have xrates */
 670         if (xrates != NULL || rates == NULL)
 671                 return 0;
 672         for (i = 0; i < rates[1]; i++) {
 673                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 674                 if (r > 2*11 || ((1<<r) & brates) == 0)
 675                         return 0;
 676         }
 677         return 1;
 678 }
 679
 680 static void
 681 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 682         int subtype, int rssi, int nf)
 683 {
 684         struct ieee80211vap *vap = ni->ni_vap;
 685         struct ieee80211com *ic = ni->ni_ic;
 686         struct ieee80211_frame *wh;
 687         uint8_t *frm, *efrm, *sfrm;
 688         uint8_t *ssid, *rates, *xrates;
 689
 690         wh = mtod(m0, struct ieee80211_frame *);
 691         frm = (uint8_t *)&wh[1];
 692         efrm = mtod(m0, uint8_t *) + m0->m_len;
 693         switch (subtype) {
 694         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 695         case IEEE80211_FC0_SUBTYPE_BEACON: {
 696                 struct ieee80211_scanparams scan;
 697                 /*
 698                  * We process beacon/probe response
 699                  * frames to discover neighbors.
 700                  */
 701                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 702                         return;
 703                 /*
 704                  * Count frame now that we know it's to be processed.
 705                  */
 706                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 707                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 708                         IEEE80211_NODE_STAT(ni, rx_beacons);
 709                 } else
 710                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 711                 /*
 712                  * If scanning, just pass information to the scan module.
 713                  */
 714                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 715                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 716                                 /*
 717                                  * Actively scanning a channel marked passive;
 718                                  * send a probe request now that we know there
 719                                  * is 802.11 traffic present.
 720                                  *
 721                                  * XXX check if the beacon we recv'd gives
 722                                  * us what we need and suppress the probe req
 723                                  */
 724                                 ieee80211_probe_curchan(vap, 1);
 725                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 726                         }
 727                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 728                         return;
 729                 }
 730                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 731                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 732                                 /*
 733                                  * Create a new entry in the neighbor table.
 734                                  */
 735                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 736                         } else if (ni->ni_capinfo == 0) {
 737                                 /*
 738                                  * Update faked node created on transmit.
 739                                  * Note this also updates the tsf.
 740                                  */
 741                                 ieee80211_init_neighbor(ni, wh, &scan);
 742                         } else {
 743                                 /*
 744                                  * Record tsf for potential resync.
 745                                  */
 746                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 747                                         sizeof(ni->ni_tstamp));
 748                         }
 749                         if (ni != NULL) {
 750                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 751                                 ni->ni_noise = nf;
 752                         }
 753                 }
 754                 break;
 755         }
 756
 757         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 758                 if (vap->iv_state != IEEE80211_S_RUN) {
 759                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 760                             wh, NULL, "wrong state %s",
 761                             ieee80211_state_name[vap->iv_state]);
 762                         vap->iv_stats.is_rx_mgtdiscard++;
 763                         return;
 764                 }
 765                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 766                         /* frame must be directed */
 767                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 768                             wh, NULL, "%s", "not unicast");
 769                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 770                         return;
 771                 }
 772
 773                 /*
 774                  * prreq frame format
 775                  *      [tlv] ssid
 776                  *      [tlv] supported rates
 777                  *      [tlv] extended supported rates
 778                  */
 779                 ssid = rates = xrates = NULL;
 780                 sfrm = frm;
 781                 while (efrm - frm > 1) {
 782                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 783                         switch (*frm) {
 784                         case IEEE80211_ELEMID_SSID:
 785                                 ssid = frm;
 786                                 break;
 787                         case IEEE80211_ELEMID_RATES:
 788                                 rates = frm;
 789                                 break;
 790                         case IEEE80211_ELEMID_XRATES:
 791                                 xrates = frm;
 792                                 break;
 793                         }
 794                         frm += frm[1] + 2;
 795                 }
 796                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 797                 if (xrates != NULL)
 798                         IEEE80211_VERIFY_ELEMENT(xrates,
 799                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 800                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 801                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 802                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 803                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 804                             wh, NULL,
 805                             "%s", "no ssid with ssid suppression enabled");
 806                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 807                         return;
 808                 }
 809
 810                 /* XXX find a better class or define it's own */
 811                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 812                     "%s", "recv probe req");
 813                 /*
 814                  * Some legacy 11b clients cannot hack a complete
 815                  * probe response frame.  When the request includes
 816                  * only a bare-bones rate set, communicate this to
 817                  * the transmit side.
 818                  */
 819                 ieee80211_send_proberesp(vap, wh->i_addr2,
 820                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 821                 break;
 822
 823         case IEEE80211_FC0_SUBTYPE_ACTION: {
 824                 const struct ieee80211_action *ia;
 825
 826                 if (vap->iv_state != IEEE80211_S_RUN) {
 827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 828                             wh, NULL, "wrong state %s",
 829                             ieee80211_state_name[vap->iv_state]);
 830                         vap->iv_stats.is_rx_mgtdiscard++;
 831                         return;
 832                 }
 833                 /*
 834                  * action frame format:
 835                  *      [1] category
 836                  *      [1] action
 837                  *      [tlv] parameters
 838                  */
 839                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 840                         sizeof(struct ieee80211_action), return);
 841                 ia = (const struct ieee80211_action *) frm;
 842
 843                 vap->iv_stats.is_rx_action++;
 844                 IEEE80211_NODE_STAT(ni, rx_action);
 845
 846                 /* verify frame payloads but defer processing */
 847                 /* XXX maybe push this to method */
 848                 switch (ia->ia_category) {
 849                 case IEEE80211_ACTION_CAT_BA:
 850                         switch (ia->ia_action) {
 851                         case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 852                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 853                                     sizeof(struct ieee80211_action_ba_addbarequest),
 854                                     return);
 855                                 break;
 856                         case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 857                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 858                                     sizeof(struct ieee80211_action_ba_addbaresponse),
 859                                     return);
 860                                 break;
 861                         case IEEE80211_ACTION_BA_DELBA:
 862                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 863                                     sizeof(struct ieee80211_action_ba_delba),
 864                                     return);
 865                                 break;
 866                         }
 867                         break;
 868                 case IEEE80211_ACTION_CAT_HT:
 869                         switch (ia->ia_action) {
 870                         case IEEE80211_ACTION_HT_TXCHWIDTH:
 871                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 872                                     sizeof(struct ieee80211_action_ht_txchwidth),
 873                                     return);
 874                                 break;
 875                         }
 876                         break;
 877                 }
 878                 ic->ic_recv_action(ni, wh, frm, efrm);
 879                 break;
 880         }
 881
 882         case IEEE80211_FC0_SUBTYPE_AUTH:
 883         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 884         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 885         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 886         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 887         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 888         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 889                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 890                      wh, NULL, "%s", "not handled");
 891                 vap->iv_stats.is_rx_mgtdiscard++;
 892                 return;
 893
 894         default:
 895                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 896                      wh, "mgt", "subtype 0x%x not handled", subtype);
 897                 vap->iv_stats.is_rx_badsubtype++;
 898                 break;
 899         }
 900 }
 901 #undef IEEE80211_VERIFY_LENGTH
 902 #undef IEEE80211_VERIFY_ELEMENT
 903
 904 static void
 905 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 906         int subtype, int rssi, int nf)
 907 {
 908         struct ieee80211vap *vap = ni->ni_vap;
 909         struct ieee80211com *ic = ni->ni_ic;
 910
 911         /*
 912          * Process management frames when scanning; useful for doing
 913          * a site-survey.
 914          */
 915         if (ic->ic_flags & IEEE80211_F_SCAN)
 916                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 917         else
 918                 vap->iv_stats.is_rx_mgtdiscard++;
 919 }
 920
 921 static void
 922 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
 923 {
 924 }