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