sys/net80211/ieee80211_adhoc.c

   1 /*-
   2  * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 IBSS mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <net80211/ieee80211_var.h>
  59 #include <net80211/ieee80211_adhoc.h>
  60 #include <net80211/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <net80211/ieee80211_superg.h>
  63 #endif
  64 #ifdef IEEE80211_SUPPORT_TDMA
  65 #include <net80211/ieee80211_tdma.h>
  66 #endif
  67 #include <net80211/ieee80211_sta.h>
  68
  69 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  70
  71 static  void adhoc_vattach(struct ieee80211vap *);
  72 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  73 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
  74             const struct ieee80211_rx_stats *, int, int);
  75 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76         int subtype, const struct ieee80211_rx_stats *, int, int);
  77 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  78             int subtype, const struct ieee80211_rx_stats *rxs, int, int);
  79 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  80
  81 void
  82 ieee80211_adhoc_attach(struct ieee80211com *ic)
  83 {
  84         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  85         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  86 }
  87
  88 void
  89 ieee80211_adhoc_detach(struct ieee80211com *ic)
  90 {
  91 }
  92
  93 static void
  94 adhoc_vdetach(struct ieee80211vap *vap)
  95 {
  96 }
  97
  98 static void
  99 adhoc_vattach(struct ieee80211vap *vap)
 100 {
 101         vap->iv_newstate = adhoc_newstate;
 102         vap->iv_input = adhoc_input;
 103         if (vap->iv_opmode == IEEE80211_M_IBSS)
 104                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 105         else
 106                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 107         vap->iv_recv_ctl = adhoc_recv_ctl;
 108         vap->iv_opdetach = adhoc_vdetach;
 109 #ifdef IEEE80211_SUPPORT_TDMA
 110         /*
 111          * Throw control to tdma support.  Note we do this
 112          * after setting up our callbacks so it can piggyback
 113          * on top of us.
 114          */
 115         if (vap->iv_caps & IEEE80211_C_TDMA)
 116                 ieee80211_tdma_vattach(vap);
 117 #endif
 118 }
 119
 120 static void
 121 sta_leave(void *arg, struct ieee80211_node *ni)
 122 {
 123         struct ieee80211vap *vap = arg;
 124
 125         if (ni->ni_vap == vap && ni != vap->iv_bss)
 126                 ieee80211_node_leave(ni);
 127 }
 128
 129 /*
 130  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 131  */
 132 static int
 133 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 134 {
 135         struct ieee80211com *ic = vap->iv_ic;
 136         struct ieee80211_node *ni;
 137         enum ieee80211_state ostate;
 138
 139         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 140
 141         ostate = vap->iv_state;
 142         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 143             __func__, ieee80211_state_name[ostate],
 144             ieee80211_state_name[nstate], arg);
 145         vap->iv_state = nstate;                 /* state transition */
 146         if (ostate != IEEE80211_S_SCAN)
 147                 ieee80211_cancel_scan(vap);     /* background scan */
 148         ni = vap->iv_bss;                       /* NB: no reference held */
 149         switch (nstate) {
 150         case IEEE80211_S_INIT:
 151                 switch (ostate) {
 152                 case IEEE80211_S_SCAN:
 153                         ieee80211_cancel_scan(vap);
 154                         break;
 155                 default:
 156                         break;
 157                 }
 158                 if (ostate != IEEE80211_S_INIT) {
 159                         /* NB: optimize INIT -> INIT case */
 160                         ieee80211_reset_bss(vap);
 161                 }
 162                 break;
 163         case IEEE80211_S_SCAN:
 164                 switch (ostate) {
 165                 case IEEE80211_S_RUN:           /* beacon miss */
 166                         /* purge station table; entries are stale */
 167                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 168                         /* fall thru... */
 169                 case IEEE80211_S_INIT:
 170                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 171                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 172                                 /*
 173                                  * Already have a channel; bypass the
 174                                  * scan and startup immediately.
 175                                  */
 176                                 ieee80211_create_ibss(vap,
 177                                     ieee80211_ht_adjust_channel(ic,
 178                                     vap->iv_des_chan, vap->iv_flags_ht));
 179                                 break;
 180                         }
 181                         /*
 182                          * Initiate a scan.  We can come here as a result
 183                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 184                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 185                          * and the scan request parameters will be present
 186                          * in iv_scanreq.  Otherwise we do the default.
 187                          */
 188                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 189                                 ieee80211_check_scan(vap,
 190                                     vap->iv_scanreq_flags,
 191                                     vap->iv_scanreq_duration,
 192                                     vap->iv_scanreq_mindwell,
 193                                     vap->iv_scanreq_maxdwell,
 194                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 195                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 196                         } else
 197                                 ieee80211_check_scan_current(vap);
 198                         break;
 199                 case IEEE80211_S_SCAN:
 200                         /*
 201                          * This can happen because of a change in state
 202                          * that requires a reset.  Trigger a new scan
 203                          * unless we're in manual roaming mode in which
 204                          * case an application must issue an explicit request.
 205                          */
 206                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 207                                 ieee80211_check_scan_current(vap);
 208                         break;
 209                 default:
 210                         goto invalid;
 211                 }
 212                 break;
 213         case IEEE80211_S_RUN:
 214                 if (vap->iv_flags & IEEE80211_F_WPA) {
 215                         /* XXX validate prerequisites */
 216                 }
 217                 switch (ostate) {
 218                 case IEEE80211_S_SCAN:
 219 #ifdef IEEE80211_DEBUG
 220                         if (ieee80211_msg_debug(vap)) {
 221                                 ieee80211_note(vap,
 222                                     "synchronized with %s ssid ",
 223                                     ether_sprintf(ni->ni_bssid));
 224                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 225                                     ni->ni_esslen);
 226                                 /* XXX MCS/HT */
 227                                 printf(" channel %d start %uMb\n",
 228                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 229                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 230                         }
 231 #endif
 232                         break;
 233                 case IEEE80211_S_RUN:   /* IBSS merge */
 234                         break;
 235                 default:
 236                         goto invalid;
 237                 }
 238                 /*
 239                  * When 802.1x is not in use mark the port authorized
 240                  * at this point so traffic can flow.
 241                  */
 242                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 243                         ieee80211_node_authorize(ni);
 244                 /*
 245                  * Fake association when joining an existing bss.
 246                  */
 247                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 248                     ic->ic_newassoc != NULL)
 249                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 250                 break;
 251         case IEEE80211_S_SLEEP:
 252                 vap->iv_sta_ps(vap, 0);
 253                 break;
 254         default:
 255         invalid:
 256                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 257                     "%s: unexpected state transition %s -> %s\n", __func__,
 258                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 259                 break;
 260         }
 261         return 0;
 262 }
 263
 264 /*
 265  * Decide if a received management frame should be
 266  * printed when debugging is enabled.  This filters some
 267  * of the less interesting frames that come frequently
 268  * (e.g. beacons).
 269  */
 270 static __inline int
 271 doprint(struct ieee80211vap *vap, int subtype)
 272 {
 273         switch (subtype) {
 274         case IEEE80211_FC0_SUBTYPE_BEACON:
 275                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 276         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 277                 return 1;
 278         }
 279         return 1;
 280 }
 281
 282 /*
 283  * Process a received frame.  The node associated with the sender
 284  * should be supplied.  If nothing was found in the node table then
 285  * the caller is assumed to supply a reference to iv_bss instead.
 286  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 287  * during AP scanning to select a AP to associate with; it can have
 288  * any units so long as values have consistent units and higher values
 289  * mean ``better signal''.  The receive timestamp is currently not used
 290  * by the 802.11 layer.
 291  */
 292 static int
 293 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
 294     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 295 {
 296         struct ieee80211vap *vap = ni->ni_vap;
 297         struct ieee80211com *ic = ni->ni_ic;
 298         struct ifnet *ifp = vap->iv_ifp;
 299         struct ieee80211_frame *wh;
 300         struct ieee80211_key *key;
 301         struct ether_header *eh;
 302         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 303         uint8_t dir, type, subtype, qos;
 304         uint8_t *bssid;
 305         uint16_t rxseq;
 306
 307         if (m->m_flags & M_AMPDU_MPDU) {
 308                 /*
 309                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 310                  * w/ M_AMPDU_MPDU marked have already passed through
 311                  * here but were received out of order and been held on
 312                  * the reorder queue.  When resubmitted they are marked
 313                  * with the M_AMPDU_MPDU flag and we can bypass most of
 314                  * the normal processing.
 315                  */
 316                 wh = mtod(m, struct ieee80211_frame *);
 317                 type = IEEE80211_FC0_TYPE_DATA;
 318                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 319                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 320                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 321                 goto resubmit_ampdu;
 322         }
 323
 324         KASSERT(ni != NULL, ("null node"));
 325         ni->ni_inact = ni->ni_inact_reload;
 326
 327         type = -1;                      /* undefined */
 328
 329         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 330                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 331                     ni->ni_macaddr, NULL,
 332                     "too short (1): len %u", m->m_pkthdr.len);
 333                 vap->iv_stats.is_rx_tooshort++;
 334                 goto out;
 335         }
 336         /*
 337          * Bit of a cheat here, we use a pointer for a 3-address
 338          * frame format but don't reference fields past outside
 339          * ieee80211_frame_min w/o first validating the data is
 340          * present.
 341          */
 342         wh = mtod(m, struct ieee80211_frame *);
 343
 344         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 345             IEEE80211_FC0_VERSION_0) {
 346                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 347                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 348                     wh->i_fc[0], wh->i_fc[1]);
 349                 vap->iv_stats.is_rx_badversion++;
 350                 goto err;
 351         }
 352
 353         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 354         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 355         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 356         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 357                 if (dir != IEEE80211_FC1_DIR_NODS)
 358                         bssid = wh->i_addr1;
 359                 else if (type == IEEE80211_FC0_TYPE_CTL)
 360                         bssid = wh->i_addr1;
 361                 else {
 362                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 363                                 IEEE80211_DISCARD_MAC(vap,
 364                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 365                                     NULL, "too short (2): len %u",
 366                                     m->m_pkthdr.len);
 367                                 vap->iv_stats.is_rx_tooshort++;
 368                                 goto out;
 369                         }
 370                         bssid = wh->i_addr3;
 371                 }
 372                 /*
 373                  * Validate the bssid.
 374                  */
 375                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 376                      (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
 377                       subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
 378                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 379                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 380                         /* not interested in */
 381                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 382                             bssid, NULL, "%s", "not to bss");
 383                         vap->iv_stats.is_rx_wrongbss++;
 384                         goto out;
 385                 }
 386                 /*
 387                  * Data frame, cons up a node when it doesn't
 388                  * exist. This should probably done after an ACL check.
 389                  */
 390                 if (type == IEEE80211_FC0_TYPE_DATA &&
 391                     ni == vap->iv_bss &&
 392                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 393                         /*
 394                          * Beware of frames that come in too early; we
 395                          * can receive broadcast frames and creating sta
 396                          * entries will blow up because there is no bss
 397                          * channel yet.
 398                          */
 399                         if (vap->iv_state != IEEE80211_S_RUN) {
 400                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 401                                     wh, "data", "not in RUN state (%s)",
 402                                     ieee80211_state_name[vap->iv_state]);
 403                                 vap->iv_stats.is_rx_badstate++;
 404                                 goto err;
 405                         }
 406                         /*
 407                          * Fake up a node for this newly
 408                          * discovered member of the IBSS.
 409                          */
 410                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 411                         if (ni == NULL) {
 412                                 /* NB: stat kept for alloc failure */
 413                                 goto err;
 414                         }
 415                 }
 416                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 417                 ni->ni_noise = nf;
 418                 if (IEEE80211_HAS_SEQ(type, subtype) &&
 419                     IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 420                         uint8_t tid = ieee80211_gettid(wh);
 421                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 422                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 423                                 ic->ic_wme.wme_hipri_traffic++;
 424                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 425                         if (! ieee80211_check_rxseq(ni, wh)) {
 426                                 /* duplicate, discard */
 427                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 428                                     bssid, "duplicate",
 429                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 430                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 431                                     ni->ni_rxseqs[tid] >>
 432                                         IEEE80211_SEQ_SEQ_SHIFT,
 433                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 434                                     ni->ni_rxseqs[tid] &
 435                                         IEEE80211_SEQ_FRAG_MASK,
 436                                     tid);
 437                                 vap->iv_stats.is_rx_dup++;
 438                                 IEEE80211_NODE_STAT(ni, rx_dup);
 439                                 goto out;
 440                         }
 441                         ni->ni_rxseqs[tid] = rxseq;
 442                 }
 443         }
 444
 445         switch (type) {
 446         case IEEE80211_FC0_TYPE_DATA:
 447                 hdrspace = ieee80211_hdrspace(ic, wh);
 448                 if (m->m_len < hdrspace &&
 449                     (m = m_pullup(m, hdrspace)) == NULL) {
 450                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 451                             ni->ni_macaddr, NULL,
 452                             "data too short: expecting %u", hdrspace);
 453                         vap->iv_stats.is_rx_tooshort++;
 454                         goto out;               /* XXX */
 455                 }
 456                 if (dir != IEEE80211_FC1_DIR_NODS) {
 457                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 458                             wh, "data", "incorrect dir 0x%x", dir);
 459                         vap->iv_stats.is_rx_wrongdir++;
 460                         goto out;
 461                 }
 462                 /* XXX no power-save support */
 463
 464                 /*
 465                  * Handle A-MPDU re-ordering.  If the frame is to be
 466                  * processed directly then ieee80211_ampdu_reorder
 467                  * will return 0; otherwise it has consumed the mbuf
 468                  * and we should do nothing more with it.
 469                  */
 470                 if ((m->m_flags & M_AMPDU) &&
 471                     ieee80211_ampdu_reorder(ni, m) != 0) {
 472                         m = NULL;
 473                         goto out;
 474                 }
 475         resubmit_ampdu:
 476
 477                 /*
 478                  * Handle privacy requirements.  Note that we
 479                  * must not be preempted from here until after
 480                  * we (potentially) call ieee80211_crypto_demic;
 481                  * otherwise we may violate assumptions in the
 482                  * crypto cipher modules used to do delayed update
 483                  * of replay sequence numbers.
 484                  */
 485                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 486                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 487                                 /*
 488                                  * Discard encrypted frames when privacy is off.
 489                                  */
 490                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 491                                     wh, "WEP", "%s", "PRIVACY off");
 492                                 vap->iv_stats.is_rx_noprivacy++;
 493                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 494                                 goto out;
 495                         }
 496                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 497                         if (key == NULL) {
 498                                 /* NB: stats+msgs handled in crypto_decap */
 499                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 500                                 goto out;
 501                         }
 502                         wh = mtod(m, struct ieee80211_frame *);
 503                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 504                 } else {
 505                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 506                         key = NULL;
 507                 }
 508
 509                 /*
 510                  * Save QoS bits for use below--before we strip the header.
 511                  */
 512                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 513                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 514                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 515                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 516                 } else
 517                         qos = 0;
 518
 519                 /*
 520                  * Next up, any fragmentation.
 521                  */
 522                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 523                         m = ieee80211_defrag(ni, m, hdrspace);
 524                         if (m == NULL) {
 525                                 /* Fragment dropped or frame not complete yet */
 526                                 goto out;
 527                         }
 528                 }
 529                 wh = NULL;              /* no longer valid, catch any uses */
 530
 531                 /*
 532                  * Next strip any MSDU crypto bits.
 533                  */
 534                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 535                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 536                             ni->ni_macaddr, "data", "%s", "demic error");
 537                         vap->iv_stats.is_rx_demicfail++;
 538                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 539                         goto out;
 540                 }
 541
 542                 /* copy to listener after decrypt */
 543                 if (ieee80211_radiotap_active_vap(vap))
 544                         ieee80211_radiotap_rx(vap, m);
 545                 need_tap = 0;
 546
 547                 /*
 548                  * Finally, strip the 802.11 header.
 549                  */
 550                 m = ieee80211_decap(vap, m, hdrspace);
 551                 if (m == NULL) {
 552                         /* XXX mask bit to check for both */
 553                         /* don't count Null data frames as errors */
 554                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 555                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 556                                 goto out;
 557                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 558                             ni->ni_macaddr, "data", "%s", "decap error");
 559                         vap->iv_stats.is_rx_decap++;
 560                         IEEE80211_NODE_STAT(ni, rx_decap);
 561                         goto err;
 562                 }
 563                 eh = mtod(m, struct ether_header *);
 564                 if (!ieee80211_node_is_authorized(ni)) {
 565                         /*
 566                          * Deny any non-PAE frames received prior to
 567                          * authorization.  For open/shared-key
 568                          * authentication the port is mark authorized
 569                          * after authentication completes.  For 802.1x
 570                          * the port is not marked authorized by the
 571                          * authenticator until the handshake has completed.
 572                          */
 573                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 574                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 575                                     eh->ether_shost, "data",
 576                                     "unauthorized port: ether type 0x%x len %u",
 577                                     eh->ether_type, m->m_pkthdr.len);
 578                                 vap->iv_stats.is_rx_unauth++;
 579                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 580                                 goto err;
 581                         }
 582                 } else {
 583                         /*
 584                          * When denying unencrypted frames, discard
 585                          * any non-PAE frames received without encryption.
 586                          */
 587                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 588                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 589                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 590                                 /*
 591                                  * Drop unencrypted frames.
 592                                  */
 593                                 vap->iv_stats.is_rx_unencrypted++;
 594                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 595                                 goto out;
 596                         }
 597                 }
 598                 /* XXX require HT? */
 599                 if (qos & IEEE80211_QOS_AMSDU) {
 600                         m = ieee80211_decap_amsdu(ni, m);
 601                         if (m == NULL)
 602                                 return IEEE80211_FC0_TYPE_DATA;
 603                 } else {
 604 #ifdef IEEE80211_SUPPORT_SUPERG
 605                         m = ieee80211_decap_fastframe(vap, ni, m);
 606                         if (m == NULL)
 607                                 return IEEE80211_FC0_TYPE_DATA;
 608 #endif
 609                 }
 610                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 611                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 612                 else
 613                         ieee80211_deliver_data(vap, ni, m);
 614                 return IEEE80211_FC0_TYPE_DATA;
 615
 616         case IEEE80211_FC0_TYPE_MGT:
 617                 vap->iv_stats.is_rx_mgmt++;
 618                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 619                 if (dir != IEEE80211_FC1_DIR_NODS) {
 620                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 621                             wh, "data", "incorrect dir 0x%x", dir);
 622                         vap->iv_stats.is_rx_wrongdir++;
 623                         goto err;
 624                 }
 625                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 626                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 627                             ni->ni_macaddr, "mgt", "too short: len %u",
 628                             m->m_pkthdr.len);
 629                         vap->iv_stats.is_rx_tooshort++;
 630                         goto out;
 631                 }
 632 #ifdef IEEE80211_DEBUG
 633                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 634                     ieee80211_msg_dumppkts(vap)) {
 635                         if_printf(ifp, "received %s from %s rssi %d\n",
 636                             ieee80211_mgt_subtype_name[subtype >>
 637                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 638                             ether_sprintf(wh->i_addr2), rssi);
 639                 }
 640 #endif
 641                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 642                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 643                             wh, NULL, "%s", "WEP set but not permitted");
 644                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 645                         goto out;
 646                 }
 647                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 648                 goto out;
 649
 650         case IEEE80211_FC0_TYPE_CTL:
 651                 vap->iv_stats.is_rx_ctl++;
 652                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 653                 vap->iv_recv_ctl(ni, m, subtype);
 654                 goto out;
 655
 656         default:
 657                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 658                     wh, "bad", "frame type 0x%x", type);
 659                 /* should not come here */
 660                 break;
 661         }
 662 err:
 663         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 664 out:
 665         if (m != NULL) {
 666                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 667                         ieee80211_radiotap_rx(vap, m);
 668                 m_freem(m);
 669         }
 670         return type;
 671 }
 672
 673 static int
 674 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 675 {
 676         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 677         int i;
 678
 679         /* NB: the 11b clients we care about will not have xrates */
 680         if (xrates != NULL || rates == NULL)
 681                 return 0;
 682         for (i = 0; i < rates[1]; i++) {
 683                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 684                 if (r > 2*11 || ((1<<r) & brates) == 0)
 685                         return 0;
 686         }
 687         return 1;
 688 }
 689
 690 static void
 691 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 692         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 693 {
 694         struct ieee80211vap *vap = ni->ni_vap;
 695         struct ieee80211com *ic = ni->ni_ic;
 696         struct ieee80211_channel *rxchan = ic->ic_curchan;
 697         struct ieee80211_frame *wh;
 698         uint8_t *frm, *efrm, *sfrm;
 699         uint8_t *ssid, *rates, *xrates;
 700 #if 0
 701         int ht_state_change = 0;
 702 #endif
 703
 704         wh = mtod(m0, struct ieee80211_frame *);
 705         frm = (uint8_t *)&wh[1];
 706         efrm = mtod(m0, uint8_t *) + m0->m_len;
 707         switch (subtype) {
 708         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 709         case IEEE80211_FC0_SUBTYPE_BEACON: {
 710                 struct ieee80211_scanparams scan;
 711                 struct ieee80211_channel *c;
 712                 /*
 713                  * We process beacon/probe response
 714                  * frames to discover neighbors.
 715                  */
 716                 if (rxs != NULL) {
 717                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
 718                         if (c != NULL)
 719                                 rxchan = c;
 720                 }
 721                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
 722                         return;
 723                 /*
 724                  * Count frame now that we know it's to be processed.
 725                  */
 726                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 727                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 728                         IEEE80211_NODE_STAT(ni, rx_beacons);
 729                 } else
 730                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 731                 /*
 732                  * If scanning, just pass information to the scan module.
 733                  */
 734                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 735                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 736                                 /*
 737                                  * Actively scanning a channel marked passive;
 738                                  * send a probe request now that we know there
 739                                  * is 802.11 traffic present.
 740                                  *
 741                                  * XXX check if the beacon we recv'd gives
 742                                  * us what we need and suppress the probe req
 743                                  */
 744                                 ieee80211_probe_curchan(vap, 1);
 745                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 746                         }
 747                         ieee80211_add_scan(vap, rxchan, &scan, wh,
 748                             subtype, rssi, nf);
 749                         return;
 750                 }
 751                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 752                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 753                                 /*
 754                                  * Create a new entry in the neighbor table.
 755                                  */
 756                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 757                         } else if (ni->ni_capinfo == 0) {
 758                                 /*
 759                                  * Update faked node created on transmit.
 760                                  * Note this also updates the tsf.
 761                                  */
 762                                 ieee80211_init_neighbor(ni, wh, &scan);
 763                         } else {
 764                                 /*
 765                                  * Record tsf for potential resync.
 766                                  */
 767                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 768                                         sizeof(ni->ni_tstamp));
 769                         }
 770                         /*
 771                          * This isn't enabled yet - otherwise it would
 772                          * update the HT parameters and channel width
 773                          * from any node, which could lead to lots of
 774                          * strange behaviour if the 11n nodes aren't
 775                          * exactly configured to match.
 776                          */
 777 #if 0
 778                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 779                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 780                                 if (ieee80211_ht_updateparams(ni,
 781                                     scan.htcap, scan.htinfo))
 782                                         ht_state_change = 1;
 783                         }
 784 #endif
 785                         if (ni != NULL) {
 786                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 787                                 ni->ni_noise = nf;
 788                         }
 789                         /*
 790                          * Same here - the channel width change should
 791                          * be applied to the specific peer node, not
 792                          * to the ic.  Ie, the interface configuration
 793                          * should stay in its current channel width;
 794                          * but it should change the rate control and
 795                          * any queued frames for the given node only.
 796                          *
 797                          * Since there's no (current) way to inform
 798                          * the driver that a channel width change has
 799                          * occured for a single node, just stub this
 800                          * out.
 801                          */
 802 #if 0
 803                         if (ht_state_change)
 804                                 ieee80211_update_chw(ic);
 805 #endif
 806                 }
 807                 break;
 808         }
 809
 810         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 811                 if (vap->iv_state != IEEE80211_S_RUN) {
 812                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 813                             wh, NULL, "wrong state %s",
 814                             ieee80211_state_name[vap->iv_state]);
 815                         vap->iv_stats.is_rx_mgtdiscard++;
 816                         return;
 817                 }
 818                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 819                         /* frame must be directed */
 820                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 821                             wh, NULL, "%s", "not unicast");
 822                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 823                         return;
 824                 }
 825
 826                 /*
 827                  * prreq frame format
 828                  *      [tlv] ssid
 829                  *      [tlv] supported rates
 830                  *      [tlv] extended supported rates
 831                  */
 832                 ssid = rates = xrates = NULL;
 833                 sfrm = frm;
 834                 while (efrm - frm > 1) {
 835                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 836                         switch (*frm) {
 837                         case IEEE80211_ELEMID_SSID:
 838                                 ssid = frm;
 839                                 break;
 840                         case IEEE80211_ELEMID_RATES:
 841                                 rates = frm;
 842                                 break;
 843                         case IEEE80211_ELEMID_XRATES:
 844                                 xrates = frm;
 845                                 break;
 846                         }
 847                         frm += frm[1] + 2;
 848                 }
 849                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 850                 if (xrates != NULL)
 851                         IEEE80211_VERIFY_ELEMENT(xrates,
 852                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 853                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 854                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 855                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 856                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 857                             wh, NULL,
 858                             "%s", "no ssid with ssid suppression enabled");
 859                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 860                         return;
 861                 }
 862
 863                 /* XXX find a better class or define it's own */
 864                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 865                     "%s", "recv probe req");
 866                 /*
 867                  * Some legacy 11b clients cannot hack a complete
 868                  * probe response frame.  When the request includes
 869                  * only a bare-bones rate set, communicate this to
 870                  * the transmit side.
 871                  */
 872                 ieee80211_send_proberesp(vap, wh->i_addr2,
 873                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 874                 break;
 875
 876         case IEEE80211_FC0_SUBTYPE_ACTION:
 877         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 878                 if (ni == vap->iv_bss) {
 879                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 880                             wh, NULL, "%s", "unknown node");
 881                         vap->iv_stats.is_rx_mgtdiscard++;
 882                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 883                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 884                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 885                             wh, NULL, "%s", "not for us");
 886                         vap->iv_stats.is_rx_mgtdiscard++;
 887                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 888                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 889                             wh, NULL, "wrong state %s",
 890                             ieee80211_state_name[vap->iv_state]);
 891                         vap->iv_stats.is_rx_mgtdiscard++;
 892                 } else {
 893                         if (ieee80211_parse_action(ni, m0) == 0)
 894                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 895                 }
 896                 break;
 897
 898         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 899         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 900         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 901         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 902         case IEEE80211_FC0_SUBTYPE_ATIM:
 903         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 904         case IEEE80211_FC0_SUBTYPE_AUTH:
 905         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 906                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 907                     wh, NULL, "%s", "not handled");
 908                 vap->iv_stats.is_rx_mgtdiscard++;
 909                 break;
 910
 911         default:
 912                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 913                     wh, "mgt", "subtype 0x%x not handled", subtype);
 914                 vap->iv_stats.is_rx_badsubtype++;
 915                 break;
 916         }
 917 }
 918 #undef IEEE80211_VERIFY_LENGTH
 919 #undef IEEE80211_VERIFY_ELEMENT
 920
 921 static void
 922 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 923         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 924 {
 925         struct ieee80211vap *vap = ni->ni_vap;
 926         struct ieee80211com *ic = ni->ni_ic;
 927         struct ieee80211_frame *wh;
 928
 929         /*
 930          * Process management frames when scanning; useful for doing
 931          * a site-survey.
 932          */
 933         if (ic->ic_flags & IEEE80211_F_SCAN)
 934                 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
 935         else {
 936                 wh = mtod(m0, struct ieee80211_frame *);
 937                 switch (subtype) {
 938                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 939                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 940                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 941                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 942                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 943                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 944                 case IEEE80211_FC0_SUBTYPE_BEACON:
 945                 case IEEE80211_FC0_SUBTYPE_ATIM:
 946                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
 947                 case IEEE80211_FC0_SUBTYPE_AUTH:
 948                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
 949                 case IEEE80211_FC0_SUBTYPE_ACTION:
 950                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 951                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 952                              wh, NULL, "%s", "not handled");
 953                         vap->iv_stats.is_rx_mgtdiscard++;
 954                         break;
 955                 default:
 956                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 957                              wh, "mgt", "subtype 0x%x not handled", subtype);
 958                         vap->iv_stats.is_rx_badsubtype++;
 959                         break;
 960                 }
 961         }
 962 }
 963
 964 static void
 965 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 966 {
 967
 968         switch (subtype) {
 969         case IEEE80211_FC0_SUBTYPE_BAR:
 970                 ieee80211_recv_bar(ni, m);
 971                 break;
 972         }
 973 }