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
  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 <netproto/802_11/ieee80211_var.h>
  59 #include <netproto/802_11/ieee80211_adhoc.h>
  60 #include <netproto/802_11/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <netproto/802_11/ieee80211_superg.h>
  63 #endif
  64 #ifdef IEEE80211_SUPPORT_TDMA
  65 #include <netproto/802_11/ieee80211_tdma.h>
  66 #endif
  67 #include <netproto/802_11/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 *, int, int);
  74 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  75         int subtype, int, int);
  76 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  77         int subtype, int, int);
  78 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  79
  80 void
  81 ieee80211_adhoc_attach(struct ieee80211com *ic)
  82 {
  83         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  84         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  85 }
  86
  87 void
  88 ieee80211_adhoc_detach(struct ieee80211com *ic)
  89 {
  90 }
  91
  92 static void
  93 adhoc_vdetach(struct ieee80211vap *vap)
  94 {
  95 }
  96
  97 static void
  98 adhoc_vattach(struct ieee80211vap *vap)
  99 {
 100         vap->iv_newstate = adhoc_newstate;
 101         vap->iv_input = adhoc_input;
 102         if (vap->iv_opmode == IEEE80211_M_IBSS)
 103                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 104         else
 105                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 106         vap->iv_recv_ctl = adhoc_recv_ctl;
 107         vap->iv_opdetach = adhoc_vdetach;
 108 #ifdef IEEE80211_SUPPORT_TDMA
 109         /*
 110          * Throw control to tdma support.  Note we do this
 111          * after setting up our callbacks so it can piggyback
 112          * on top of us.
 113          */
 114         if (vap->iv_caps & IEEE80211_C_TDMA)
 115                 ieee80211_tdma_vattach(vap);
 116 #endif
 117 }
 118
 119 static void
 120 sta_leave(void *arg, struct ieee80211_node *ni)
 121 {
 122         struct ieee80211vap *vap = arg;
 123
 124         if (ni->ni_vap == vap && ni != vap->iv_bss)
 125                 ieee80211_node_leave(ni);
 126 }
 127
 128 /*
 129  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 130  */
 131 static int
 132 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 133 {
 134         struct ieee80211com *ic = vap->iv_ic;
 135         struct ieee80211_node *ni;
 136         enum ieee80211_state ostate;
 137
 138         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 139
 140         ostate = vap->iv_state;
 141         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 142             __func__, ieee80211_state_name[ostate],
 143             ieee80211_state_name[nstate], arg);
 144         vap->iv_state = nstate;                 /* state transition */
 145         if (ostate != IEEE80211_S_SCAN)
 146                 ieee80211_cancel_scan(vap);     /* background scan */
 147         ni = vap->iv_bss;                       /* NB: no reference held */
 148         switch (nstate) {
 149         case IEEE80211_S_INIT:
 150                 switch (ostate) {
 151                 case IEEE80211_S_SCAN:
 152                         ieee80211_cancel_scan(vap);
 153                         break;
 154                 default:
 155                         break;
 156                 }
 157                 if (ostate != IEEE80211_S_INIT) {
 158                         /* NB: optimize INIT -> INIT case */
 159                         ieee80211_reset_bss(vap);
 160                 }
 161                 break;
 162         case IEEE80211_S_SCAN:
 163                 switch (ostate) {
 164                 case IEEE80211_S_RUN:           /* beacon miss */
 165                         /* purge station table; entries are stale */
 166                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 167                         /* fall thru... */
 168                 case IEEE80211_S_INIT:
 169                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 170                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 171                                 /*
 172                                  * Already have a channel; bypass the
 173                                  * scan and startup immediately.
 174                                  */
 175                                 ieee80211_create_ibss(vap,
 176                                     ieee80211_ht_adjust_channel(ic,
 177                                     vap->iv_des_chan, vap->iv_flags_ht));
 178                                 break;
 179                         }
 180                         /*
 181                          * Initiate a scan.  We can come here as a result
 182                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 183                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 184                          * and the scan request parameters will be present
 185                          * in iv_scanreq.  Otherwise we do the default.
 186                          */
 187                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 188                                 ieee80211_check_scan(vap,
 189                                     vap->iv_scanreq_flags,
 190                                     vap->iv_scanreq_duration,
 191                                     vap->iv_scanreq_mindwell,
 192                                     vap->iv_scanreq_maxdwell,
 193                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 194                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 195                         } else
 196                                 ieee80211_check_scan_current(vap);
 197                         break;
 198                 case IEEE80211_S_SCAN:
 199                         /*
 200                          * This can happen because of a change in state
 201                          * that requires a reset.  Trigger a new scan
 202                          * unless we're in manual roaming mode in which
 203                          * case an application must issue an explicit request.
 204                          */
 205                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 206                                 ieee80211_check_scan_current(vap);
 207                         break;
 208                 default:
 209                         goto invalid;
 210                 }
 211                 break;
 212         case IEEE80211_S_RUN:
 213                 if (vap->iv_flags & IEEE80211_F_WPA) {
 214                         /* XXX validate prerequisites */
 215                 }
 216                 switch (ostate) {
 217                 case IEEE80211_S_SCAN:
 218 #ifdef IEEE80211_DEBUG
 219                         if (ieee80211_msg_debug(vap)) {
 220                                 ieee80211_note(vap,
 221                                     "synchronized with %s ssid ",
 222                                     ether_sprintf(ni->ni_bssid));
 223                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 224                                     ni->ni_esslen);
 225                                 /* XXX MCS/HT */
 226                                 kprintf(" channel %d start %uMb\n",
 227                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 228                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 229                         }
 230 #endif
 231                         break;
 232                 default:
 233                         goto invalid;
 234                 }
 235                 /*
 236                  * When 802.1x is not in use mark the port authorized
 237                  * at this point so traffic can flow.
 238                  */
 239                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 240                         ieee80211_node_authorize(ni);
 241                 /*
 242                  * Fake association when joining an existing bss.
 243                  */
 244                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 245                     ic->ic_newassoc != NULL)
 246                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 247                 break;
 248         case IEEE80211_S_SLEEP:
 249                 vap->iv_sta_ps(vap, 0);
 250                 break;
 251         default:
 252         invalid:
 253                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 254                     "%s: unexpected state transition %s -> %s\n", __func__,
 255                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 256                 break;
 257         }
 258         return 0;
 259 }
 260
 261 /*
 262  * Decide if a received management frame should be
 263  * printed when debugging is enabled.  This filters some
 264  * of the less interesting frames that come frequently
 265  * (e.g. beacons).
 266  */
 267 static __inline int
 268 doprint(struct ieee80211vap *vap, int subtype)
 269 {
 270         switch (subtype) {
 271         case IEEE80211_FC0_SUBTYPE_BEACON:
 272                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 273         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 274                 return 1;
 275         }
 276         return 1;
 277 }
 278
 279 /*
 280  * Process a received frame.  The node associated with the sender
 281  * should be supplied.  If nothing was found in the node table then
 282  * the caller is assumed to supply a reference to iv_bss instead.
 283  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 284  * during AP scanning to select a AP to associate with; it can have
 285  * any units so long as values have consistent units and higher values
 286  * mean ``better signal''.  The receive timestamp is currently not used
 287  * by the 802.11 layer.
 288  */
 289 static int
 290 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 291 {
 292 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 293         struct ieee80211vap *vap = ni->ni_vap;
 294         struct ieee80211com *ic = ni->ni_ic;
 295         struct ifnet *ifp = vap->iv_ifp;
 296         struct ieee80211_frame *wh;
 297         struct ieee80211_key *key;
 298         struct ether_header *eh;
 299         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 300         uint8_t dir, type, subtype, qos;
 301         uint8_t *bssid;
 302         uint16_t rxseq;
 303
 304         if (m->m_flags & M_AMPDU_MPDU) {
 305                 /*
 306                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 307                  * w/ M_AMPDU_MPDU marked have already passed through
 308                  * here but were received out of order and been held on
 309                  * the reorder queue.  When resubmitted they are marked
 310                  * with the M_AMPDU_MPDU flag and we can bypass most of
 311                  * the normal processing.
 312                  */
 313                 wh = mtod(m, struct ieee80211_frame *);
 314                 type = IEEE80211_FC0_TYPE_DATA;
 315                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 316                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 317                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 318                 goto resubmit_ampdu;
 319         }
 320
 321         KASSERT(ni != NULL, ("null node"));
 322         ni->ni_inact = ni->ni_inact_reload;
 323
 324         type = -1;                      /* undefined */
 325
 326         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 327                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 328                     ni->ni_macaddr, NULL,
 329                     "too short (1): len %u", m->m_pkthdr.len);
 330                 vap->iv_stats.is_rx_tooshort++;
 331                 goto out;
 332         }
 333         /*
 334          * Bit of a cheat here, we use a pointer for a 3-address
 335          * frame format but don't reference fields past outside
 336          * ieee80211_frame_min w/o first validating the data is
 337          * present.
 338          */
 339         wh = mtod(m, struct ieee80211_frame *);
 340
 341         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 342             IEEE80211_FC0_VERSION_0) {
 343                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 344                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 345                     wh->i_fc[0], wh->i_fc[1]);
 346                 vap->iv_stats.is_rx_badversion++;
 347                 goto err;
 348         }
 349
 350         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 351         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 352         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 353         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 354                 if (dir != IEEE80211_FC1_DIR_NODS)
 355                         bssid = wh->i_addr1;
 356                 else if (type == IEEE80211_FC0_TYPE_CTL)
 357                         bssid = wh->i_addr1;
 358                 else {
 359                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 360                                 IEEE80211_DISCARD_MAC(vap,
 361                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 362                                     NULL, "too short (2): len %u",
 363                                     m->m_pkthdr.len);
 364                                 vap->iv_stats.is_rx_tooshort++;
 365                                 goto out;
 366                         }
 367                         bssid = wh->i_addr3;
 368                 }
 369                 /*
 370                  * Validate the bssid.
 371                  */
 372                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 373                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 374                         /* not interested in */
 375                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 376                             bssid, NULL, "%s", "not to bss");
 377                         vap->iv_stats.is_rx_wrongbss++;
 378                         goto out;
 379                 }
 380                 /*
 381                  * Data frame, cons up a node when it doesn't
 382                  * exist. This should probably done after an ACL check.
 383                  */
 384                 if (type == IEEE80211_FC0_TYPE_DATA &&
 385                     ni == vap->iv_bss &&
 386                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 387                         /*
 388                          * Beware of frames that come in too early; we
 389                          * can receive broadcast frames and creating sta
 390                          * entries will blow up because there is no bss
 391                          * channel yet.
 392                          */
 393                         if (vap->iv_state != IEEE80211_S_RUN) {
 394                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 395                                     wh, "data", "not in RUN state (%s)",
 396                                     ieee80211_state_name[vap->iv_state]);
 397                                 vap->iv_stats.is_rx_badstate++;
 398                                 goto err;
 399                         }
 400                         /*
 401                          * Fake up a node for this newly
 402                          * discovered member of the IBSS.
 403                          */
 404                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 405                         if (ni == NULL) {
 406                                 /* NB: stat kept for alloc failure */
 407                                 goto err;
 408                         }
 409                 }
 410                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 411                 ni->ni_noise = nf;
 412                 if (HAS_SEQ(type)) {
 413                         uint8_t tid = ieee80211_gettid(wh);
 414                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 415                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 416                                 ic->ic_wme.wme_hipri_traffic++;
 417                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 418                         if (! ieee80211_check_rxseq(ni, wh)) {
 419                                 /* duplicate, discard */
 420                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 421                                     bssid, "duplicate",
 422                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 423                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 424                                     ni->ni_rxseqs[tid] >>
 425                                         IEEE80211_SEQ_SEQ_SHIFT,
 426                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 427                                     ni->ni_rxseqs[tid] &
 428                                         IEEE80211_SEQ_FRAG_MASK,
 429                                     tid);
 430                                 vap->iv_stats.is_rx_dup++;
 431                                 IEEE80211_NODE_STAT(ni, rx_dup);
 432                                 goto out;
 433                         }
 434                         ni->ni_rxseqs[tid] = rxseq;
 435                 }
 436         }
 437
 438         switch (type) {
 439         case IEEE80211_FC0_TYPE_DATA:
 440                 hdrspace = ieee80211_hdrspace(ic, wh);
 441                 if (m->m_len < hdrspace &&
 442                     (m = m_pullup(m, hdrspace)) == NULL) {
 443                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 444                             ni->ni_macaddr, NULL,
 445                             "data too short: expecting %u", hdrspace);
 446                         vap->iv_stats.is_rx_tooshort++;
 447                         goto out;               /* XXX */
 448                 }
 449                 if (dir != IEEE80211_FC1_DIR_NODS) {
 450                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 451                             wh, "data", "incorrect dir 0x%x", dir);
 452                         vap->iv_stats.is_rx_wrongdir++;
 453                         goto out;
 454                 }
 455                 /* XXX no power-save support */
 456
 457                 /*
 458                  * Handle A-MPDU re-ordering.  If the frame is to be
 459                  * processed directly then ieee80211_ampdu_reorder
 460                  * will return 0; otherwise it has consumed the mbuf
 461                  * and we should do nothing more with it.
 462                  */
 463                 if ((m->m_flags & M_AMPDU) &&
 464                     ieee80211_ampdu_reorder(ni, m) != 0) {
 465                         m = NULL;
 466                         goto out;
 467                 }
 468         resubmit_ampdu:
 469
 470                 /*
 471                  * Handle privacy requirements.  Note that we
 472                  * must not be preempted from here until after
 473                  * we (potentially) call ieee80211_crypto_demic;
 474                  * otherwise we may violate assumptions in the
 475                  * crypto cipher modules used to do delayed update
 476                  * of replay sequence numbers.
 477                  */
 478                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 479                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 480                                 /*
 481                                  * Discard encrypted frames when privacy is off.
 482                                  */
 483                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 484                                     wh, "WEP", "%s", "PRIVACY off");
 485                                 vap->iv_stats.is_rx_noprivacy++;
 486                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 487                                 goto out;
 488                         }
 489                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 490                         if (key == NULL) {
 491                                 /* NB: stats+msgs handled in crypto_decap */
 492                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 493                                 goto out;
 494                         }
 495                         wh = mtod(m, struct ieee80211_frame *);
 496                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 497                 } else {
 498                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 499                         key = NULL;
 500                 }
 501
 502                 /*
 503                  * Save QoS bits for use below--before we strip the header.
 504                  */
 505                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 506                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 507                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 508                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 509                 } else
 510                         qos = 0;
 511
 512                 /*
 513                  * Next up, any fragmentation.
 514                  */
 515                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 516                         m = ieee80211_defrag(ni, m, hdrspace);
 517                         if (m == NULL) {
 518                                 /* Fragment dropped or frame not complete yet */
 519                                 goto out;
 520                         }
 521                 }
 522                 wh = NULL;              /* no longer valid, catch any uses */
 523
 524                 /*
 525                  * Next strip any MSDU crypto bits.
 526                  */
 527                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 528                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 529                             ni->ni_macaddr, "data", "%s", "demic error");
 530                         vap->iv_stats.is_rx_demicfail++;
 531                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 532                         goto out;
 533                 }
 534
 535                 /* copy to listener after decrypt */
 536                 if (ieee80211_radiotap_active_vap(vap))
 537                         ieee80211_radiotap_rx(vap, m);
 538                 need_tap = 0;
 539
 540                 /*
 541                  * Finally, strip the 802.11 header.
 542                  */
 543                 m = ieee80211_decap(vap, m, hdrspace);
 544                 if (m == NULL) {
 545                         /* XXX mask bit to check for both */
 546                         /* don't count Null data frames as errors */
 547                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 548                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 549                                 goto out;
 550                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 551                             ni->ni_macaddr, "data", "%s", "decap error");
 552                         vap->iv_stats.is_rx_decap++;
 553                         IEEE80211_NODE_STAT(ni, rx_decap);
 554                         goto err;
 555                 }
 556                 eh = mtod(m, struct ether_header *);
 557                 if (!ieee80211_node_is_authorized(ni)) {
 558                         /*
 559                          * Deny any non-PAE frames received prior to
 560                          * authorization.  For open/shared-key
 561                          * authentication the port is mark authorized
 562                          * after authentication completes.  For 802.1x
 563                          * the port is not marked authorized by the
 564                          * authenticator until the handshake has completed.
 565                          */
 566                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 567                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 568                                     eh->ether_shost, "data",
 569                                     "unauthorized port: ether type 0x%x len %u",
 570                                     eh->ether_type, m->m_pkthdr.len);
 571                                 vap->iv_stats.is_rx_unauth++;
 572                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 573                                 goto err;
 574                         }
 575                 } else {
 576                         /*
 577                          * When denying unencrypted frames, discard
 578                          * any non-PAE frames received without encryption.
 579                          */
 580                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 581                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 582                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 583                                 /*
 584                                  * Drop unencrypted frames.
 585                                  */
 586                                 vap->iv_stats.is_rx_unencrypted++;
 587                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 588                                 goto out;
 589                         }
 590                 }
 591                 /* XXX require HT? */
 592                 if (qos & IEEE80211_QOS_AMSDU) {
 593                         m = ieee80211_decap_amsdu(ni, m);
 594                         if (m == NULL)
 595                                 return IEEE80211_FC0_TYPE_DATA;
 596                 } else {
 597 #ifdef IEEE80211_SUPPORT_SUPERG
 598                         m = ieee80211_decap_fastframe(vap, ni, m);
 599                         if (m == NULL)
 600                                 return IEEE80211_FC0_TYPE_DATA;
 601 #endif
 602                 }
 603                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 604                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 605                 else
 606                         ieee80211_deliver_data(vap, ni, m);
 607                 return IEEE80211_FC0_TYPE_DATA;
 608
 609         case IEEE80211_FC0_TYPE_MGT:
 610                 vap->iv_stats.is_rx_mgmt++;
 611                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 612                 if (dir != IEEE80211_FC1_DIR_NODS) {
 613                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 614                             wh, "data", "incorrect dir 0x%x", dir);
 615                         vap->iv_stats.is_rx_wrongdir++;
 616                         goto err;
 617                 }
 618                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 619                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 620                             ni->ni_macaddr, "mgt", "too short: len %u",
 621                             m->m_pkthdr.len);
 622                         vap->iv_stats.is_rx_tooshort++;
 623                         goto out;
 624                 }
 625 #ifdef IEEE80211_DEBUG
 626                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 627                     ieee80211_msg_dumppkts(vap)) {
 628                         if_printf(ifp, "received %s from %s rssi %d\n",
 629                             ieee80211_mgt_subtype_name[subtype >>
 630                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 631                             ether_sprintf(wh->i_addr2), rssi);
 632                 }
 633 #endif
 634                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 635                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 636                             wh, NULL, "%s", "WEP set but not permitted");
 637                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 638                         goto out;
 639                 }
 640                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 641                 goto out;
 642
 643         case IEEE80211_FC0_TYPE_CTL:
 644                 vap->iv_stats.is_rx_ctl++;
 645                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 646                 vap->iv_recv_ctl(ni, m, subtype);
 647                 goto out;
 648
 649         default:
 650                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 651                     wh, "bad", "frame type 0x%x", type);
 652                 /* should not come here */
 653                 break;
 654         }
 655 err:
 656         IFNET_STAT_INC(ifp, ierrors, 1);
 657 out:
 658         if (m != NULL) {
 659                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 660                         ieee80211_radiotap_rx(vap, m);
 661                 m_freem(m);
 662         }
 663         return type;
 664 }
 665
 666 static int
 667 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 668 {
 669         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 670         int i;
 671
 672         /* NB: the 11b clients we care about will not have xrates */
 673         if (xrates != NULL || rates == NULL)
 674                 return 0;
 675         for (i = 0; i < rates[1]; i++) {
 676                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 677                 if (r > 2*11 || ((1<<r) & brates) == 0)
 678                         return 0;
 679         }
 680         return 1;
 681 }
 682
 683 static void
 684 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 685         int subtype, int rssi, int nf)
 686 {
 687         struct ieee80211vap *vap = ni->ni_vap;
 688         struct ieee80211com *ic = ni->ni_ic;
 689         struct ieee80211_frame *wh;
 690         uint8_t *frm, *efrm, *sfrm;
 691         uint8_t *ssid, *rates, *xrates;
 692 #if 0
 693         int ht_state_change = 0;
 694 #endif
 695
 696         wh = mtod(m0, struct ieee80211_frame *);
 697         frm = (uint8_t *)&wh[1];
 698         efrm = mtod(m0, uint8_t *) + m0->m_len;
 699         switch (subtype) {
 700         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 701         case IEEE80211_FC0_SUBTYPE_BEACON: {
 702                 struct ieee80211_scanparams scan;
 703                 /*
 704                  * We process beacon/probe response
 705                  * frames to discover neighbors.
 706                  */
 707                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 708                         return;
 709                 /*
 710                  * Count frame now that we know it's to be processed.
 711                  */
 712                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 713                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 714                         IEEE80211_NODE_STAT(ni, rx_beacons);
 715                 } else
 716                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 717                 /*
 718                  * If scanning, just pass information to the scan module.
 719                  */
 720                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 721                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 722                                 /*
 723                                  * Actively scanning a channel marked passive;
 724                                  * send a probe request now that we know there
 725                                  * is 802.11 traffic present.
 726                                  *
 727                                  * XXX check if the beacon we recv'd gives
 728                                  * us what we need and suppress the probe req
 729                                  */
 730                                 ieee80211_probe_curchan(vap, 1);
 731                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 732                         }
 733                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 734                         return;
 735                 }
 736                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 737                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 738                                 /*
 739                                  * Create a new entry in the neighbor table.
 740                                  */
 741                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 742                         } else if (ni->ni_capinfo == 0) {
 743                                 /*
 744                                  * Update faked node created on transmit.
 745                                  * Note this also updates the tsf.
 746                                  */
 747                                 ieee80211_init_neighbor(ni, wh, &scan);
 748                         } else {
 749                                 /*
 750                                  * Record tsf for potential resync.
 751                                  */
 752                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 753                                         sizeof(ni->ni_tstamp));
 754                         }
 755                         /*
 756                          * This isn't enabled yet - otherwise it would
 757                          * update the HT parameters and channel width
 758                          * from any node, which could lead to lots of
 759                          * strange behaviour if the 11n nodes aren't
 760                          * exactly configured to match.
 761                          */
 762 #if 0
 763                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 764                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 765                                 if (ieee80211_ht_updateparams(ni,
 766                                     scan.htcap, scan.htinfo))
 767                                         ht_state_change = 1;
 768                         }
 769 #endif
 770                         if (ni != NULL) {
 771                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 772                                 ni->ni_noise = nf;
 773                         }
 774                         /*
 775                          * Same here - the channel width change should
 776                          * be applied to the specific peer node, not
 777                          * to the ic.  Ie, the interface configuration
 778                          * should stay in its current channel width;
 779                          * but it should change the rate control and
 780                          * any queued frames for the given node only.
 781                          *
 782                          * Since there's no (current) way to inform
 783                          * the driver that a channel width change has
 784                          * occured for a single node, just stub this
 785                          * out.
 786                          */
 787 #if 0
 788                         if (ht_state_change)
 789                                 ieee80211_update_chw(ic);
 790 #endif
 791                 }
 792                 break;
 793         }
 794
 795         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 796                 if (vap->iv_state != IEEE80211_S_RUN) {
 797                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 798                             wh, NULL, "wrong state %s",
 799                             ieee80211_state_name[vap->iv_state]);
 800                         vap->iv_stats.is_rx_mgtdiscard++;
 801                         return;
 802                 }
 803                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 804                         /* frame must be directed */
 805                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 806                             wh, NULL, "%s", "not unicast");
 807                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 808                         return;
 809                 }
 810
 811                 /*
 812                  * prreq frame format
 813                  *      [tlv] ssid
 814                  *      [tlv] supported rates
 815                  *      [tlv] extended supported rates
 816                  */
 817                 ssid = rates = xrates = NULL;
 818                 sfrm = frm;
 819                 while (efrm - frm > 1) {
 820                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 821                         switch (*frm) {
 822                         case IEEE80211_ELEMID_SSID:
 823                                 ssid = frm;
 824                                 break;
 825                         case IEEE80211_ELEMID_RATES:
 826                                 rates = frm;
 827                                 break;
 828                         case IEEE80211_ELEMID_XRATES:
 829                                 xrates = frm;
 830                                 break;
 831                         }
 832                         frm += frm[1] + 2;
 833                 }
 834                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 835                 if (xrates != NULL)
 836                         IEEE80211_VERIFY_ELEMENT(xrates,
 837                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 838                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 839                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 840                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 841                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 842                             wh, NULL,
 843                             "%s", "no ssid with ssid suppression enabled");
 844                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 845                         return;
 846                 }
 847
 848                 /* XXX find a better class or define it's own */
 849                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 850                     "%s", "recv probe req");
 851                 /*
 852                  * Some legacy 11b clients cannot hack a complete
 853                  * probe response frame.  When the request includes
 854                  * only a bare-bones rate set, communicate this to
 855                  * the transmit side.
 856                  */
 857                 ieee80211_send_proberesp(vap, wh->i_addr2,
 858                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 859                 break;
 860
 861         case IEEE80211_FC0_SUBTYPE_ACTION:
 862         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 863                 if (ni == vap->iv_bss) {
 864                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 865                             wh, NULL, "%s", "unknown node");
 866                         vap->iv_stats.is_rx_mgtdiscard++;
 867                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 868                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 869                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 870                             wh, NULL, "%s", "not for us");
 871                         vap->iv_stats.is_rx_mgtdiscard++;
 872                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 873                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 874                             wh, NULL, "wrong state %s",
 875                             ieee80211_state_name[vap->iv_state]);
 876                         vap->iv_stats.is_rx_mgtdiscard++;
 877                 } else {
 878                         if (ieee80211_parse_action(ni, m0) == 0)
 879                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 880                 }
 881                 break;
 882
 883         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 884         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 885         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 886         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 887         case IEEE80211_FC0_SUBTYPE_ATIM:
 888         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 889         case IEEE80211_FC0_SUBTYPE_AUTH:
 890         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 891                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 892                     wh, NULL, "%s", "not handled");
 893                 vap->iv_stats.is_rx_mgtdiscard++;
 894                 break;
 895
 896         default:
 897                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 898                     wh, "mgt", "subtype 0x%x not handled", subtype);
 899                 vap->iv_stats.is_rx_badsubtype++;
 900                 break;
 901         }
 902 }
 903 #undef IEEE80211_VERIFY_LENGTH
 904 #undef IEEE80211_VERIFY_ELEMENT
 905
 906 static void
 907 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 908         int subtype, int rssi, int nf)
 909 {
 910         struct ieee80211vap *vap = ni->ni_vap;
 911         struct ieee80211com *ic = ni->ni_ic;
 912         struct ieee80211_frame *wh;
 913
 914         /*
 915          * Process management frames when scanning; useful for doing
 916          * a site-survey.
 917          */
 918         if (ic->ic_flags & IEEE80211_F_SCAN)
 919                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 920         else {
 921                 wh = mtod(m0, struct ieee80211_frame *);
 922                 switch (subtype) {
 923                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 924                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 925                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 926                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 927                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 928                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 929                 case IEEE80211_FC0_SUBTYPE_BEACON:
 930                 case IEEE80211_FC0_SUBTYPE_ATIM:
 931                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
 932                 case IEEE80211_FC0_SUBTYPE_AUTH:
 933                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
 934                 case IEEE80211_FC0_SUBTYPE_ACTION:
 935                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 936                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 937                              wh, NULL, "%s", "not handled");
 938                         vap->iv_stats.is_rx_mgtdiscard++;
 939                         break;
 940                 default:
 941                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 942                              wh, "mgt", "subtype 0x%x not handled", subtype);
 943                         vap->iv_stats.is_rx_badsubtype++;
 944                         break;
 945                 }
 946         }
 947 }
 948
 949 static void
 950 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 951 {
 952
 953         switch (subtype) {
 954         case IEEE80211_FC0_SUBTYPE_BAR:
 955                 ieee80211_recv_bar(ni, m);
 956                 break;
 957         }
 958 }