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_media.h>
  52 #include <net/if_llc.h>
  53 #include <net/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_adhoc.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63 #ifdef IEEE80211_SUPPORT_TDMA
  64 #include <net80211/ieee80211_tdma.h>
  65 #endif
  66 #include <net80211/ieee80211_sta.h>
  67
  68 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  69
  70 static  void adhoc_vattach(struct ieee80211vap *);
  71 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  72 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
  73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  74         int subtype, int, int);
  75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76         int subtype, int, int);
  77 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  78
  79 void
  80 ieee80211_adhoc_attach(struct ieee80211com *ic)
  81 {
  82         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  83         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  84 }
  85
  86 void
  87 ieee80211_adhoc_detach(struct ieee80211com *ic)
  88 {
  89 }
  90
  91 static void
  92 adhoc_vdetach(struct ieee80211vap *vap)
  93 {
  94 }
  95
  96 static void
  97 adhoc_vattach(struct ieee80211vap *vap)
  98 {
  99         vap->iv_newstate = adhoc_newstate;
 100         vap->iv_input = adhoc_input;
 101         if (vap->iv_opmode == IEEE80211_M_IBSS)
 102                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 103         else
 104                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 105         vap->iv_recv_ctl = adhoc_recv_ctl;
 106         vap->iv_opdetach = adhoc_vdetach;
 107 #ifdef IEEE80211_SUPPORT_TDMA
 108         /*
 109          * Throw control to tdma support.  Note we do this
 110          * after setting up our callbacks so it can piggyback
 111          * on top of us.
 112          */
 113         if (vap->iv_caps & IEEE80211_C_TDMA)
 114                 ieee80211_tdma_vattach(vap);
 115 #endif
 116 }
 117
 118 static void
 119 sta_leave(void *arg, struct ieee80211_node *ni)
 120 {
 121         struct ieee80211vap *vap = arg;
 122
 123         if (ni->ni_vap == vap && ni != vap->iv_bss)
 124                 ieee80211_node_leave(ni);
 125 }
 126
 127 /*
 128  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 129  */
 130 static int
 131 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 132 {
 133         struct ieee80211com *ic = vap->iv_ic;
 134         struct ieee80211_node *ni;
 135         enum ieee80211_state ostate;
 136
 137         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 138
 139         ostate = vap->iv_state;
 140         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 141             __func__, ieee80211_state_name[ostate],
 142             ieee80211_state_name[nstate], arg);
 143         vap->iv_state = nstate;                 /* state transition */
 144         if (ostate != IEEE80211_S_SCAN)
 145                 ieee80211_cancel_scan(vap);     /* background scan */
 146         ni = vap->iv_bss;                       /* NB: no reference held */
 147         switch (nstate) {
 148         case IEEE80211_S_INIT:
 149                 switch (ostate) {
 150                 case IEEE80211_S_SCAN:
 151                         ieee80211_cancel_scan(vap);
 152                         break;
 153                 default:
 154                         break;
 155                 }
 156                 if (ostate != IEEE80211_S_INIT) {
 157                         /* NB: optimize INIT -> INIT case */
 158                         ieee80211_reset_bss(vap);
 159                 }
 160                 break;
 161         case IEEE80211_S_SCAN:
 162                 switch (ostate) {
 163                 case IEEE80211_S_RUN:           /* beacon miss */
 164                         /* purge station table; entries are stale */
 165                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 166                         /* fall thru... */
 167                 case IEEE80211_S_INIT:
 168                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 169                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 170                                 /*
 171                                  * Already have a channel; bypass the
 172                                  * scan and startup immediately.
 173                                  */
 174                                 ieee80211_create_ibss(vap,
 175                                     ieee80211_ht_adjust_channel(ic,
 176                                     vap->iv_des_chan, vap->iv_flags_ht));
 177                                 break;
 178                         }
 179                         /*
 180                          * Initiate a scan.  We can come here as a result
 181                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 182                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 183                          * and the scan request parameters will be present
 184                          * in iv_scanreq.  Otherwise we do the default.
 185                          */
 186                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 187                                 ieee80211_check_scan(vap,
 188                                     vap->iv_scanreq_flags,
 189                                     vap->iv_scanreq_duration,
 190                                     vap->iv_scanreq_mindwell,
 191                                     vap->iv_scanreq_maxdwell,
 192                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 193                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 194                         } else
 195                                 ieee80211_check_scan_current(vap);
 196                         break;
 197                 case IEEE80211_S_SCAN:
 198                         /*
 199                          * This can happen because of a change in state
 200                          * that requires a reset.  Trigger a new scan
 201                          * unless we're in manual roaming mode in which
 202                          * case an application must issue an explicit request.
 203                          */
 204                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 205                                 ieee80211_check_scan_current(vap);
 206                         break;
 207                 default:
 208                         goto invalid;
 209                 }
 210                 break;
 211         case IEEE80211_S_RUN:
 212                 if (vap->iv_flags & IEEE80211_F_WPA) {
 213                         /* XXX validate prerequisites */
 214                 }
 215                 switch (ostate) {
 216                 case IEEE80211_S_SCAN:
 217 #ifdef IEEE80211_DEBUG
 218                         if (ieee80211_msg_debug(vap)) {
 219                                 ieee80211_note(vap,
 220                                     "synchronized with %s ssid ",
 221                                     ether_sprintf(ni->ni_bssid));
 222                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 223                                     ni->ni_esslen);
 224                                 /* XXX MCS/HT */
 225                                 printf(" channel %d start %uMb\n",
 226                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 227                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 228                         }
 229 #endif
 230                         break;
 231                 default:
 232                         goto invalid;
 233                 }
 234                 /*
 235                  * When 802.1x is not in use mark the port authorized
 236                  * at this point so traffic can flow.
 237                  */
 238                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 239                         ieee80211_node_authorize(ni);
 240                 /*
 241                  * Fake association when joining an existing bss.
 242                  */
 243                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 244                     ic->ic_newassoc != NULL)
 245                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 246                 break;
 247         case IEEE80211_S_SLEEP:
 248                 vap->iv_sta_ps(vap, 0);
 249                 break;
 250         default:
 251         invalid:
 252                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 253                     "%s: unexpected state transition %s -> %s\n", __func__,
 254                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 255                 break;
 256         }
 257         return 0;
 258 }
 259
 260 /*
 261  * Decide if a received management frame should be
 262  * printed when debugging is enabled.  This filters some
 263  * of the less interesting frames that come frequently
 264  * (e.g. beacons).
 265  */
 266 static __inline int
 267 doprint(struct ieee80211vap *vap, int subtype)
 268 {
 269         switch (subtype) {
 270         case IEEE80211_FC0_SUBTYPE_BEACON:
 271                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 272         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 273                 return 1;
 274         }
 275         return 1;
 276 }
 277
 278 /*
 279  * Process a received frame.  The node associated with the sender
 280  * should be supplied.  If nothing was found in the node table then
 281  * the caller is assumed to supply a reference to iv_bss instead.
 282  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 283  * during AP scanning to select a AP to associate with; it can have
 284  * any units so long as values have consistent units and higher values
 285  * mean ``better signal''.  The receive timestamp is currently not used
 286  * by the 802.11 layer.
 287  */
 288 static int
 289 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 290 {
 291 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 292         struct ieee80211vap *vap = ni->ni_vap;
 293         struct ieee80211com *ic = ni->ni_ic;
 294         struct ifnet *ifp = vap->iv_ifp;
 295         struct ieee80211_frame *wh;
 296         struct ieee80211_key *key;
 297         struct ether_header *eh;
 298         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 299         uint8_t dir, type, subtype, qos;
 300         uint8_t *bssid;
 301         uint16_t rxseq;
 302
 303         if (m->m_flags & M_AMPDU_MPDU) {
 304                 /*
 305                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 306                  * w/ M_AMPDU_MPDU marked have already passed through
 307                  * here but were received out of order and been held on
 308                  * the reorder queue.  When resubmitted they are marked
 309                  * with the M_AMPDU_MPDU flag and we can bypass most of
 310                  * the normal processing.
 311                  */
 312                 wh = mtod(m, struct ieee80211_frame *);
 313                 type = IEEE80211_FC0_TYPE_DATA;
 314                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 315                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 316                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 317                 goto resubmit_ampdu;
 318         }
 319
 320         KASSERT(ni != NULL, ("null node"));
 321         ni->ni_inact = ni->ni_inact_reload;
 322
 323         type = -1;                      /* undefined */
 324
 325         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 326                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 327                     ni->ni_macaddr, NULL,
 328                     "too short (1): len %u", m->m_pkthdr.len);
 329                 vap->iv_stats.is_rx_tooshort++;
 330                 goto out;
 331         }
 332         /*
 333          * Bit of a cheat here, we use a pointer for a 3-address
 334          * frame format but don't reference fields past outside
 335          * ieee80211_frame_min w/o first validating the data is
 336          * present.
 337          */
 338         wh = mtod(m, struct ieee80211_frame *);
 339
 340         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 341             IEEE80211_FC0_VERSION_0) {
 342                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 343                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 344                     wh->i_fc[0], wh->i_fc[1]);
 345                 vap->iv_stats.is_rx_badversion++;
 346                 goto err;
 347         }
 348
 349         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 350         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 351         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 352         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 353                 if (dir != IEEE80211_FC1_DIR_NODS)
 354                         bssid = wh->i_addr1;
 355                 else if (type == IEEE80211_FC0_TYPE_CTL)
 356                         bssid = wh->i_addr1;
 357                 else {
 358                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 359                                 IEEE80211_DISCARD_MAC(vap,
 360                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 361                                     NULL, "too short (2): len %u",
 362                                     m->m_pkthdr.len);
 363                                 vap->iv_stats.is_rx_tooshort++;
 364                                 goto out;
 365                         }
 366                         bssid = wh->i_addr3;
 367                 }
 368                 /*
 369                  * Validate the bssid.
 370                  */
 371                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 372                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 373                         /* not interested in */
 374                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 375                             bssid, NULL, "%s", "not to bss");
 376                         vap->iv_stats.is_rx_wrongbss++;
 377                         goto out;
 378                 }
 379                 /*
 380                  * Data frame, cons up a node when it doesn't
 381                  * exist. This should probably done after an ACL check.
 382                  */
 383                 if (type == IEEE80211_FC0_TYPE_DATA &&
 384                     ni == vap->iv_bss &&
 385                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 386                         /*
 387                          * Beware of frames that come in too early; we
 388                          * can receive broadcast frames and creating sta
 389                          * entries will blow up because there is no bss
 390                          * channel yet.
 391                          */
 392                         if (vap->iv_state != IEEE80211_S_RUN) {
 393                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 394                                     wh, "data", "not in RUN state (%s)",
 395                                     ieee80211_state_name[vap->iv_state]);
 396                                 vap->iv_stats.is_rx_badstate++;
 397                                 goto err;
 398                         }
 399                         /*
 400                          * Fake up a node for this newly
 401                          * discovered member of the IBSS.
 402                          */
 403                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 404                         if (ni == NULL) {
 405                                 /* NB: stat kept for alloc failure */
 406                                 goto err;
 407                         }
 408                 }
 409                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 410                 ni->ni_noise = nf;
 411                 if (HAS_SEQ(type)) {
 412                         uint8_t tid = ieee80211_gettid(wh);
 413                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 414                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 415                                 ic->ic_wme.wme_hipri_traffic++;
 416                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 417                         if (! ieee80211_check_rxseq(ni, wh)) {
 418                                 /* duplicate, discard */
 419                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 420                                     bssid, "duplicate",
 421                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 422                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 423                                     ni->ni_rxseqs[tid] >>
 424                                         IEEE80211_SEQ_SEQ_SHIFT,
 425                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 426                                     ni->ni_rxseqs[tid] &
 427                                         IEEE80211_SEQ_FRAG_MASK,
 428                                     tid);
 429                                 vap->iv_stats.is_rx_dup++;
 430                                 IEEE80211_NODE_STAT(ni, rx_dup);
 431                                 goto out;
 432                         }
 433                         ni->ni_rxseqs[tid] = rxseq;
 434                 }
 435         }
 436
 437         switch (type) {
 438         case IEEE80211_FC0_TYPE_DATA:
 439                 hdrspace = ieee80211_hdrspace(ic, wh);
 440                 if (m->m_len < hdrspace &&
 441                     (m = m_pullup(m, hdrspace)) == NULL) {
 442                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 443                             ni->ni_macaddr, NULL,
 444                             "data too short: expecting %u", hdrspace);
 445                         vap->iv_stats.is_rx_tooshort++;
 446                         goto out;               /* XXX */
 447                 }
 448                 if (dir != IEEE80211_FC1_DIR_NODS) {
 449                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 450                             wh, "data", "incorrect dir 0x%x", dir);
 451                         vap->iv_stats.is_rx_wrongdir++;
 452                         goto out;
 453                 }
 454                 /* XXX no power-save support */
 455
 456                 /*
 457                  * Handle A-MPDU re-ordering.  If the frame is to be
 458                  * processed directly then ieee80211_ampdu_reorder
 459                  * will return 0; otherwise it has consumed the mbuf
 460                  * and we should do nothing more with it.
 461                  */
 462                 if ((m->m_flags & M_AMPDU) &&
 463                     ieee80211_ampdu_reorder(ni, m) != 0) {
 464                         m = NULL;
 465                         goto out;
 466                 }
 467         resubmit_ampdu:
 468
 469                 /*
 470                  * Handle privacy requirements.  Note that we
 471                  * must not be preempted from here until after
 472                  * we (potentially) call ieee80211_crypto_demic;
 473                  * otherwise we may violate assumptions in the
 474                  * crypto cipher modules used to do delayed update
 475                  * of replay sequence numbers.
 476                  */
 477                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 478                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 479                                 /*
 480                                  * Discard encrypted frames when privacy is off.
 481                                  */
 482                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 483                                     wh, "WEP", "%s", "PRIVACY off");
 484                                 vap->iv_stats.is_rx_noprivacy++;
 485                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 486                                 goto out;
 487                         }
 488                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 489                         if (key == NULL) {
 490                                 /* NB: stats+msgs handled in crypto_decap */
 491                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 492                                 goto out;
 493                         }
 494                         wh = mtod(m, struct ieee80211_frame *);
 495                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 496                 } else {
 497                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 498                         key = NULL;
 499                 }
 500
 501                 /*
 502                  * Save QoS bits for use below--before we strip the header.
 503                  */
 504                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 505                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 506                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 507                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 508                 } else
 509                         qos = 0;
 510
 511                 /*
 512                  * Next up, any fragmentation.
 513                  */
 514                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 515                         m = ieee80211_defrag(ni, m, hdrspace);
 516                         if (m == NULL) {
 517                                 /* Fragment dropped or frame not complete yet */
 518                                 goto out;
 519                         }
 520                 }
 521                 wh = NULL;              /* no longer valid, catch any uses */
 522
 523                 /*
 524                  * Next strip any MSDU crypto bits.
 525                  */
 526                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 527                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 528                             ni->ni_macaddr, "data", "%s", "demic error");
 529                         vap->iv_stats.is_rx_demicfail++;
 530                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 531                         goto out;
 532                 }
 533
 534                 /* copy to listener after decrypt */
 535                 if (ieee80211_radiotap_active_vap(vap))
 536                         ieee80211_radiotap_rx(vap, m);
 537                 need_tap = 0;
 538
 539                 /*
 540                  * Finally, strip the 802.11 header.
 541                  */
 542                 m = ieee80211_decap(vap, m, hdrspace);
 543                 if (m == NULL) {
 544                         /* XXX mask bit to check for both */
 545                         /* don't count Null data frames as errors */
 546                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 547                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 548                                 goto out;
 549                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 550                             ni->ni_macaddr, "data", "%s", "decap error");
 551                         vap->iv_stats.is_rx_decap++;
 552                         IEEE80211_NODE_STAT(ni, rx_decap);
 553                         goto err;
 554                 }
 555                 eh = mtod(m, struct ether_header *);
 556                 if (!ieee80211_node_is_authorized(ni)) {
 557                         /*
 558                          * Deny any non-PAE frames received prior to
 559                          * authorization.  For open/shared-key
 560                          * authentication the port is mark authorized
 561                          * after authentication completes.  For 802.1x
 562                          * the port is not marked authorized by the
 563                          * authenticator until the handshake has completed.
 564                          */
 565                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 566                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 567                                     eh->ether_shost, "data",
 568                                     "unauthorized port: ether type 0x%x len %u",
 569                                     eh->ether_type, m->m_pkthdr.len);
 570                                 vap->iv_stats.is_rx_unauth++;
 571                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 572                                 goto err;
 573                         }
 574                 } else {
 575                         /*
 576                          * When denying unencrypted frames, discard
 577                          * any non-PAE frames received without encryption.
 578                          */
 579                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 580                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 581                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 582                                 /*
 583                                  * Drop unencrypted frames.
 584                                  */
 585                                 vap->iv_stats.is_rx_unencrypted++;
 586                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 587                                 goto out;
 588                         }
 589                 }
 590                 /* XXX require HT? */
 591                 if (qos & IEEE80211_QOS_AMSDU) {
 592                         m = ieee80211_decap_amsdu(ni, m);
 593                         if (m == NULL)
 594                                 return IEEE80211_FC0_TYPE_DATA;
 595                 } else {
 596 #ifdef IEEE80211_SUPPORT_SUPERG
 597                         m = ieee80211_decap_fastframe(vap, ni, m);
 598                         if (m == NULL)
 599                                 return IEEE80211_FC0_TYPE_DATA;
 600 #endif
 601                 }
 602                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 603                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 604                 else
 605                         ieee80211_deliver_data(vap, ni, m);
 606                 return IEEE80211_FC0_TYPE_DATA;
 607
 608         case IEEE80211_FC0_TYPE_MGT:
 609                 vap->iv_stats.is_rx_mgmt++;
 610                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 611                 if (dir != IEEE80211_FC1_DIR_NODS) {
 612                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 613                             wh, "data", "incorrect dir 0x%x", dir);
 614                         vap->iv_stats.is_rx_wrongdir++;
 615                         goto err;
 616                 }
 617                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 618                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 619                             ni->ni_macaddr, "mgt", "too short: len %u",
 620                             m->m_pkthdr.len);
 621                         vap->iv_stats.is_rx_tooshort++;
 622                         goto out;
 623                 }
 624 #ifdef IEEE80211_DEBUG
 625                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 626                     ieee80211_msg_dumppkts(vap)) {
 627                         if_printf(ifp, "received %s from %s rssi %d\n",
 628                             ieee80211_mgt_subtype_name[subtype >>
 629                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 630                             ether_sprintf(wh->i_addr2), rssi);
 631                 }
 632 #endif
 633                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 634                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 635                             wh, NULL, "%s", "WEP set but not permitted");
 636                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 637                         goto out;
 638                 }
 639                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 640                 goto out;
 641
 642         case IEEE80211_FC0_TYPE_CTL:
 643                 vap->iv_stats.is_rx_ctl++;
 644                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 645                 vap->iv_recv_ctl(ni, m, subtype);
 646                 goto out;
 647
 648         default:
 649                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 650                     wh, "bad", "frame type 0x%x", type);
 651                 /* should not come here */
 652                 break;
 653         }
 654 err:
 655         ifp->if_ierrors++;
 656 out:
 657         if (m != NULL) {
 658                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 659                         ieee80211_radiotap_rx(vap, m);
 660                 m_freem(m);
 661         }
 662         return type;
 663 }
 664
 665 static int
 666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 667 {
 668         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 669         int i;
 670
 671         /* NB: the 11b clients we care about will not have xrates */
 672         if (xrates != NULL || rates == NULL)
 673                 return 0;
 674         for (i = 0; i < rates[1]; i++) {
 675                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 676                 if (r > 2*11 || ((1<<r) & brates) == 0)
 677                         return 0;
 678         }
 679         return 1;
 680 }
 681
 682 static void
 683 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 684         int subtype, int rssi, int nf)
 685 {
 686         struct ieee80211vap *vap = ni->ni_vap;
 687         struct ieee80211com *ic = ni->ni_ic;
 688         struct ieee80211_frame *wh;
 689         uint8_t *frm, *efrm, *sfrm;
 690         uint8_t *ssid, *rates, *xrates;
 691 #if 0
 692         int ht_state_change = 0;
 693 #endif
 694
 695         wh = mtod(m0, struct ieee80211_frame *);
 696         frm = (uint8_t *)&wh[1];
 697         efrm = mtod(m0, uint8_t *) + m0->m_len;
 698         switch (subtype) {
 699         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 700         case IEEE80211_FC0_SUBTYPE_BEACON: {
 701                 struct ieee80211_scanparams scan;
 702                 /*
 703                  * We process beacon/probe response
 704                  * frames to discover neighbors.
 705                  */
 706                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 707                         return;
 708                 /*
 709                  * Count frame now that we know it's to be processed.
 710                  */
 711                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 712                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 713                         IEEE80211_NODE_STAT(ni, rx_beacons);
 714                 } else
 715                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 716                 /*
 717                  * If scanning, just pass information to the scan module.
 718                  */
 719                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 720                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 721                                 /*
 722                                  * Actively scanning a channel marked passive;
 723                                  * send a probe request now that we know there
 724                                  * is 802.11 traffic present.
 725                                  *
 726                                  * XXX check if the beacon we recv'd gives
 727                                  * us what we need and suppress the probe req
 728                                  */
 729                                 ieee80211_probe_curchan(vap, 1);
 730                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 731                         }
 732                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 733                         return;
 734                 }
 735                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 736                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 737                                 /*
 738                                  * Create a new entry in the neighbor table.
 739                                  */
 740                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 741                         } else if (ni->ni_capinfo == 0) {
 742                                 /*
 743                                  * Update faked node created on transmit.
 744                                  * Note this also updates the tsf.
 745                                  */
 746                                 ieee80211_init_neighbor(ni, wh, &scan);
 747                         } else {
 748                                 /*
 749                                  * Record tsf for potential resync.
 750                                  */
 751                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 752                                         sizeof(ni->ni_tstamp));
 753                         }
 754                         /*
 755                          * This isn't enabled yet - otherwise it would
 756                          * update the HT parameters and channel width
 757                          * from any node, which could lead to lots of
 758                          * strange behaviour if the 11n nodes aren't
 759                          * exactly configured to match.
 760                          */
 761 #if 0
 762                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 763                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 764                                 if (ieee80211_ht_updateparams(ni,
 765                                     scan.htcap, scan.htinfo))
 766                                         ht_state_change = 1;
 767                         }
 768 #endif
 769                         if (ni != NULL) {
 770                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 771                                 ni->ni_noise = nf;
 772                         }
 773                         /*
 774                          * Same here - the channel width change should
 775                          * be applied to the specific peer node, not
 776                          * to the ic.  Ie, the interface configuration
 777                          * should stay in its current channel width;
 778                          * but it should change the rate control and
 779                          * any queued frames for the given node only.
 780                          *
 781                          * Since there's no (current) way to inform
 782                          * the driver that a channel width change has
 783                          * occured for a single node, just stub this
 784                          * out.
 785                          */
 786 #if 0
 787                         if (ht_state_change)
 788                                 ieee80211_update_chw(ic);
 789 #endif
 790                 }
 791                 break;
 792         }
 793
 794         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 795                 if (vap->iv_state != IEEE80211_S_RUN) {
 796                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 797                             wh, NULL, "wrong state %s",
 798                             ieee80211_state_name[vap->iv_state]);
 799                         vap->iv_stats.is_rx_mgtdiscard++;
 800                         return;
 801                 }
 802                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 803                         /* frame must be directed */
 804                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 805                             wh, NULL, "%s", "not unicast");
 806                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 807                         return;
 808                 }
 809
 810                 /*
 811                  * prreq frame format
 812                  *      [tlv] ssid
 813                  *      [tlv] supported rates
 814                  *      [tlv] extended supported rates
 815                  */
 816                 ssid = rates = xrates = NULL;
 817                 sfrm = frm;
 818                 while (efrm - frm > 1) {
 819                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 820                         switch (*frm) {
 821                         case IEEE80211_ELEMID_SSID:
 822                                 ssid = frm;
 823                                 break;
 824                         case IEEE80211_ELEMID_RATES:
 825                                 rates = frm;
 826                                 break;
 827                         case IEEE80211_ELEMID_XRATES:
 828                                 xrates = frm;
 829                                 break;
 830                         }
 831                         frm += frm[1] + 2;
 832                 }
 833                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 834                 if (xrates != NULL)
 835                         IEEE80211_VERIFY_ELEMENT(xrates,
 836                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 837                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 838                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 839                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 840                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 841                             wh, NULL,
 842                             "%s", "no ssid with ssid suppression enabled");
 843                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 844                         return;
 845                 }
 846
 847                 /* XXX find a better class or define it's own */
 848                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 849                     "%s", "recv probe req");
 850                 /*
 851                  * Some legacy 11b clients cannot hack a complete
 852                  * probe response frame.  When the request includes
 853                  * only a bare-bones rate set, communicate this to
 854                  * the transmit side.
 855                  */
 856                 ieee80211_send_proberesp(vap, wh->i_addr2,
 857                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 858                 break;
 859
 860         case IEEE80211_FC0_SUBTYPE_ACTION:
 861         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 862                 if (ni == vap->iv_bss) {
 863                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 864                             wh, NULL, "%s", "unknown node");
 865                         vap->iv_stats.is_rx_mgtdiscard++;
 866                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 867                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 868                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 869                             wh, NULL, "%s", "not for us");
 870                         vap->iv_stats.is_rx_mgtdiscard++;
 871                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 872                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 873                             wh, NULL, "wrong state %s",
 874                             ieee80211_state_name[vap->iv_state]);
 875                         vap->iv_stats.is_rx_mgtdiscard++;
 876                 } else {
 877                         if (ieee80211_parse_action(ni, m0) == 0)
 878                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 879                 }
 880                 break;
 881
 882         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 883         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 884         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 885         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 886         case IEEE80211_FC0_SUBTYPE_ATIM:
 887         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 888         case IEEE80211_FC0_SUBTYPE_AUTH:
 889         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 890                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 891                     wh, NULL, "%s", "not handled");
 892                 vap->iv_stats.is_rx_mgtdiscard++;
 893                 break;
 894
 895         default:
 896                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 897                     wh, "mgt", "subtype 0x%x not handled", subtype);
 898                 vap->iv_stats.is_rx_badsubtype++;
 899                 break;
 900         }
 901 }
 902 #undef IEEE80211_VERIFY_LENGTH
 903 #undef IEEE80211_VERIFY_ELEMENT
 904
 905 static void
 906 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 907         int subtype, int rssi, int nf)
 908 {
 909         struct ieee80211vap *vap = ni->ni_vap;
 910         struct ieee80211com *ic = ni->ni_ic;
 911         struct ieee80211_frame *wh;
 912
 913         /*
 914          * Process management frames when scanning; useful for doing
 915          * a site-survey.
 916          */
 917         if (ic->ic_flags & IEEE80211_F_SCAN)
 918                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 919         else {
 920                 wh = mtod(m0, struct ieee80211_frame *);
 921                 switch (subtype) {
 922                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 923                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 924                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 925                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 926                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 927                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 928                 case IEEE80211_FC0_SUBTYPE_BEACON:
 929                 case IEEE80211_FC0_SUBTYPE_ATIM:
 930                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
 931                 case IEEE80211_FC0_SUBTYPE_AUTH:
 932                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
 933                 case IEEE80211_FC0_SUBTYPE_ACTION:
 934                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 935                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 936                              wh, NULL, "%s", "not handled");
 937                         vap->iv_stats.is_rx_mgtdiscard++;
 938                         break;
 939                 default:
 940                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 941                              wh, "mgt", "subtype 0x%x not handled", subtype);
 942                         vap->iv_stats.is_rx_badsubtype++;
 943                         break;
 944                 }
 945         }
 946 }
 947
 948 static void
 949 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 950 {
 951
 952         switch (subtype) {
 953         case IEEE80211_FC0_SUBTYPE_BAR:
 954                 ieee80211_recv_bar(ni, m);
 955                 break;
 956         }
 957 }