sys/net80211/ieee80211_adhoc.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifdef __FreeBSD__
  30 __FBSDID("$FreeBSD$");
  31 #endif
  32
  33 /*
  34  * IEEE 802.11 IBSS mode support.
  35  */
  36 #include "opt_inet.h"
  37 #include "opt_wlan.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/malloc.h>
  43 #include <sys/kernel.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/sockio.h>
  47 #include <sys/endian.h>
  48 #include <sys/errno.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_var.h>
  54 #include <net/if_media.h>
  55 #include <net/if_llc.h>
  56 #include <net/if_private.h>
  57 #include <net/ethernet.h>
  58
  59 #include <net/bpf.h>
  60
  61 #include <net80211/ieee80211_var.h>
  62 #include <net80211/ieee80211_adhoc.h>
  63 #include <net80211/ieee80211_input.h>
  64 #ifdef IEEE80211_SUPPORT_SUPERG
  65 #include <net80211/ieee80211_superg.h>
  66 #endif
  67 #ifdef IEEE80211_SUPPORT_TDMA
  68 #include <net80211/ieee80211_tdma.h>
  69 #endif
  70 #include <net80211/ieee80211_sta.h>
  71
  72 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  73
  74 static  void adhoc_vattach(struct ieee80211vap *);
  75 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  76 static int adhoc_input(struct ieee80211_node *, struct mbuf *,
  77             const struct ieee80211_rx_stats *, int, int);
  78 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  79         int subtype, const struct ieee80211_rx_stats *, int, int);
  80 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  81             int subtype, const struct ieee80211_rx_stats *rxs, int, int);
  82 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  83
  84 void
  85 ieee80211_adhoc_attach(struct ieee80211com *ic)
  86 {
  87         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  88         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  89 }
  90
  91 void
  92 ieee80211_adhoc_detach(struct ieee80211com *ic)
  93 {
  94 }
  95
  96 static void
  97 adhoc_vdetach(struct ieee80211vap *vap)
  98 {
  99 }
 100
 101 static void
 102 adhoc_vattach(struct ieee80211vap *vap)
 103 {
 104         vap->iv_newstate = adhoc_newstate;
 105         vap->iv_input = adhoc_input;
 106         if (vap->iv_opmode == IEEE80211_M_IBSS)
 107                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 108         else
 109                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 110         vap->iv_recv_ctl = adhoc_recv_ctl;
 111         vap->iv_opdetach = adhoc_vdetach;
 112 #ifdef IEEE80211_SUPPORT_TDMA
 113         /*
 114          * Throw control to tdma support.  Note we do this
 115          * after setting up our callbacks so it can piggyback
 116          * on top of us.
 117          */
 118         if (vap->iv_caps & IEEE80211_C_TDMA)
 119                 ieee80211_tdma_vattach(vap);
 120 #endif
 121 }
 122
 123 static void
 124 sta_leave(void *arg, struct ieee80211_node *ni)
 125 {
 126         struct ieee80211vap *vap = ni->ni_vap;
 127
 128         if (ni != vap->iv_bss)
 129                 ieee80211_node_leave(ni);
 130 }
 131
 132 /*
 133  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 134  */
 135 static int
 136 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 137 {
 138         struct ieee80211com *ic = vap->iv_ic;
 139         struct ieee80211_node *ni;
 140         enum ieee80211_state ostate;
 141
 142         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 143
 144         ostate = vap->iv_state;
 145         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 146             __func__, ieee80211_state_name[ostate],
 147             ieee80211_state_name[nstate], arg);
 148         vap->iv_state = nstate;                 /* state transition */
 149         if (ostate != IEEE80211_S_SCAN)
 150                 ieee80211_cancel_scan(vap);     /* background scan */
 151         ni = vap->iv_bss;                       /* NB: no reference held */
 152         switch (nstate) {
 153         case IEEE80211_S_INIT:
 154                 switch (ostate) {
 155                 case IEEE80211_S_SCAN:
 156                         ieee80211_cancel_scan(vap);
 157                         break;
 158                 default:
 159                         break;
 160                 }
 161                 if (ostate != IEEE80211_S_INIT) {
 162                         /* NB: optimize INIT -> INIT case */
 163                         ieee80211_reset_bss(vap);
 164                 }
 165                 break;
 166         case IEEE80211_S_SCAN:
 167                 switch (ostate) {
 168                 case IEEE80211_S_RUN:           /* beacon miss */
 169                         /* purge station table; entries are stale */
 170                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 171                             sta_leave, NULL);
 172                         /* fall thru... */
 173                 case IEEE80211_S_INIT:
 174                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 175                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 176                                 /*
 177                                  * Already have a channel; bypass the
 178                                  * scan and startup immediately.
 179                                  */
 180                                 ieee80211_create_ibss(vap,
 181                                     ieee80211_ht_adjust_channel(ic,
 182                                     vap->iv_des_chan, vap->iv_flags_ht));
 183                                 break;
 184                         }
 185                         /*
 186                          * Initiate a scan.  We can come here as a result
 187                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 188                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 189                          * and the scan request parameters will be present
 190                          * in iv_scanreq.  Otherwise we do the default.
 191                          */
 192                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 193                                 ieee80211_check_scan(vap,
 194                                     vap->iv_scanreq_flags,
 195                                     vap->iv_scanreq_duration,
 196                                     vap->iv_scanreq_mindwell,
 197                                     vap->iv_scanreq_maxdwell,
 198                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 199                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 200                         } else
 201                                 ieee80211_check_scan_current(vap);
 202                         break;
 203                 case IEEE80211_S_SCAN:
 204                         /*
 205                          * This can happen because of a change in state
 206                          * that requires a reset.  Trigger a new scan
 207                          * unless we're in manual roaming mode in which
 208                          * case an application must issue an explicit request.
 209                          */
 210                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 211                                 ieee80211_check_scan_current(vap);
 212                         break;
 213                 default:
 214                         goto invalid;
 215                 }
 216                 break;
 217         case IEEE80211_S_RUN:
 218                 if (vap->iv_flags & IEEE80211_F_WPA) {
 219                         /* XXX validate prerequisites */
 220                 }
 221                 switch (ostate) {
 222                 case IEEE80211_S_INIT:
 223                         /*
 224                          * Already have a channel; bypass the
 225                          * scan and startup immediately.
 226                          * Note that ieee80211_create_ibss will call
 227                          * back to do a RUN->RUN state change.
 228                          */
 229                         ieee80211_create_ibss(vap,
 230                             ieee80211_ht_adjust_channel(ic,
 231                                 ic->ic_curchan, vap->iv_flags_ht));
 232                         /* NB: iv_bss is changed on return */
 233                         ni = vap->iv_bss;
 234                         break;
 235                 case IEEE80211_S_SCAN:
 236 #ifdef IEEE80211_DEBUG
 237                         if (ieee80211_msg_debug(vap)) {
 238                                 ieee80211_note(vap,
 239                                     "synchronized with %s ssid ",
 240                                     ether_sprintf(ni->ni_bssid));
 241                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 242                                     ni->ni_esslen);
 243                                 /* XXX MCS/HT */
 244                                 printf(" channel %d start %uMb\n",
 245                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 246                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 247                         }
 248 #endif
 249                         break;
 250                 case IEEE80211_S_RUN:   /* IBSS merge */
 251                         break;
 252                 default:
 253                         goto invalid;
 254                 }
 255                 /*
 256                  * When 802.1x is not in use mark the port authorized
 257                  * at this point so traffic can flow.
 258                  */
 259                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 260                         ieee80211_node_authorize(ni);
 261                 /*
 262                  * Fake association when joining an existing bss.
 263                  */
 264                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 265                     ic->ic_newassoc != NULL)
 266                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 267                 break;
 268         case IEEE80211_S_SLEEP:
 269                 vap->iv_sta_ps(vap, 0);
 270                 break;
 271         default:
 272         invalid:
 273                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 274                     "%s: unexpected state transition %s -> %s\n", __func__,
 275                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 276                 break;
 277         }
 278         return 0;
 279 }
 280
 281 /*
 282  * Decide if a received management frame should be
 283  * printed when debugging is enabled.  This filters some
 284  * of the less interesting frames that come frequently
 285  * (e.g. beacons).
 286  */
 287 static __inline int
 288 doprint(struct ieee80211vap *vap, int subtype)
 289 {
 290         switch (subtype) {
 291         case IEEE80211_FC0_SUBTYPE_BEACON:
 292                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 293         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 294                 return 1;
 295         }
 296         return 1;
 297 }
 298
 299 /*
 300  * Process a received frame.  The node associated with the sender
 301  * should be supplied.  If nothing was found in the node table then
 302  * the caller is assumed to supply a reference to iv_bss instead.
 303  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 304  * during AP scanning to select a AP to associate with; it can have
 305  * any units so long as values have consistent units and higher values
 306  * mean ``better signal''.  The receive timestamp is currently not used
 307  * by the 802.11 layer.
 308  */
 309 static int
 310 adhoc_input(struct ieee80211_node *ni, struct mbuf *m,
 311     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 312 {
 313         struct ieee80211vap *vap = ni->ni_vap;
 314         struct ieee80211com *ic = ni->ni_ic;
 315         struct ifnet *ifp = vap->iv_ifp;
 316         struct ieee80211_frame *wh;
 317         struct ieee80211_key *key;
 318         struct ether_header *eh;
 319         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 320         uint8_t dir, type, subtype, qos;
 321         uint8_t *bssid;
 322         int is_hw_decrypted = 0;
 323         int has_decrypted = 0;
 324
 325         /*
 326          * Some devices do hardware decryption all the way through
 327          * to pretending the frame wasn't encrypted in the first place.
 328          * So, tag it appropriately so it isn't discarded inappropriately.
 329          */
 330         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 331                 is_hw_decrypted = 1;
 332
 333         if (m->m_flags & M_AMPDU_MPDU) {
 334                 /*
 335                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 336                  * w/ M_AMPDU_MPDU marked have already passed through
 337                  * here but were received out of order and been held on
 338                  * the reorder queue.  When resubmitted they are marked
 339                  * with the M_AMPDU_MPDU flag and we can bypass most of
 340                  * the normal processing.
 341                  */
 342                 wh = mtod(m, struct ieee80211_frame *);
 343                 type = IEEE80211_FC0_TYPE_DATA;
 344                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 345                 subtype = IEEE80211_FC0_SUBTYPE_QOS_DATA;
 346                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 347                 goto resubmit_ampdu;
 348         }
 349
 350         KASSERT(ni != NULL, ("null node"));
 351         ni->ni_inact = ni->ni_inact_reload;
 352
 353         type = -1;                      /* undefined */
 354
 355         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 356                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 357                     ni->ni_macaddr, NULL,
 358                     "too short (1): len %u", m->m_pkthdr.len);
 359                 vap->iv_stats.is_rx_tooshort++;
 360                 goto out;
 361         }
 362         /*
 363          * Bit of a cheat here, we use a pointer for a 3-address
 364          * frame format but don't reference fields past outside
 365          * ieee80211_frame_min w/o first validating the data is
 366          * present.
 367          */
 368         wh = mtod(m, struct ieee80211_frame *);
 369
 370         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 371             IEEE80211_FC0_VERSION_0) {
 372                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 373                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 374                     wh->i_fc[0], wh->i_fc[1]);
 375                 vap->iv_stats.is_rx_badversion++;
 376                 goto err;
 377         }
 378
 379         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 380         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 381         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 382         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 383                 if (dir != IEEE80211_FC1_DIR_NODS)
 384                         bssid = wh->i_addr1;
 385                 else if (type == IEEE80211_FC0_TYPE_CTL)
 386                         bssid = wh->i_addr1;
 387                 else {
 388                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 389                                 IEEE80211_DISCARD_MAC(vap,
 390                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 391                                     NULL, "too short (2): len %u",
 392                                     m->m_pkthdr.len);
 393                                 vap->iv_stats.is_rx_tooshort++;
 394                                 goto out;
 395                         }
 396                         bssid = wh->i_addr3;
 397                 }
 398                 /*
 399                  * Validate the bssid.
 400                  */
 401                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 402                      (subtype == IEEE80211_FC0_SUBTYPE_BEACON ||
 403                       subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP)) &&
 404                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 405                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 406                         /* not interested in */
 407                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 408                             bssid, NULL, "%s", "not to bss");
 409                         vap->iv_stats.is_rx_wrongbss++;
 410                         goto out;
 411                 }
 412                 /*
 413                  * Data frame, cons up a node when it doesn't
 414                  * exist. This should probably done after an ACL check.
 415                  */
 416                 if (type == IEEE80211_FC0_TYPE_DATA &&
 417                     ni == vap->iv_bss &&
 418                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 419                         /*
 420                          * Beware of frames that come in too early; we
 421                          * can receive broadcast frames and creating sta
 422                          * entries will blow up because there is no bss
 423                          * channel yet.
 424                          */
 425                         if (vap->iv_state != IEEE80211_S_RUN) {
 426                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 427                                     wh, "data", "not in RUN state (%s)",
 428                                     ieee80211_state_name[vap->iv_state]);
 429                                 vap->iv_stats.is_rx_badstate++;
 430                                 goto err;
 431                         }
 432                         /*
 433                          * Fake up a node for this newly discovered member
 434                          * of the IBSS.
 435                          *
 436                          * Note: This doesn't "upgrade" the node to 11n;
 437                          * that will happen after a probe request/response
 438                          * exchange.
 439                          */
 440                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 441                         if (ni == NULL) {
 442                                 /* NB: stat kept for alloc failure */
 443                                 goto err;
 444                         }
 445                 }
 446                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 447                 ni->ni_noise = nf;
 448                 if (IEEE80211_HAS_SEQ(type, subtype) &&
 449                     IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 450                         uint8_t tid = ieee80211_gettid(wh);
 451                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 452                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 453                                 ic->ic_wme.wme_hipri_traffic++;
 454                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 455                                 goto out;
 456                 }
 457         }
 458
 459         switch (type) {
 460         case IEEE80211_FC0_TYPE_DATA:
 461                 hdrspace = ieee80211_hdrspace(ic, wh);
 462                 if (m->m_len < hdrspace &&
 463                     (m = m_pullup(m, hdrspace)) == NULL) {
 464                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 465                             ni->ni_macaddr, NULL,
 466                             "data too short: expecting %u", hdrspace);
 467                         vap->iv_stats.is_rx_tooshort++;
 468                         goto out;               /* XXX */
 469                 }
 470                 if (dir != IEEE80211_FC1_DIR_NODS) {
 471                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 472                             wh, "data", "incorrect dir 0x%x", dir);
 473                         vap->iv_stats.is_rx_wrongdir++;
 474                         goto out;
 475                 }
 476                 /* XXX no power-save support */
 477
 478                 /*
 479                  * Handle A-MPDU re-ordering.  If the frame is to be
 480                  * processed directly then ieee80211_ampdu_reorder
 481                  * will return 0; otherwise it has consumed the mbuf
 482                  * and we should do nothing more with it.
 483                  */
 484                 if ((m->m_flags & M_AMPDU) &&
 485                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 486                         m = NULL;
 487                         goto out;
 488                 }
 489         resubmit_ampdu:
 490
 491                 /*
 492                  * Handle privacy requirements.  Note that we
 493                  * must not be preempted from here until after
 494                  * we (potentially) call ieee80211_crypto_demic;
 495                  * otherwise we may violate assumptions in the
 496                  * crypto cipher modules used to do delayed update
 497                  * of replay sequence numbers.
 498                  */
 499                 if (is_hw_decrypted || IEEE80211_IS_PROTECTED(wh)) {
 500                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 501                                 /*
 502                                  * Discard encrypted frames when privacy is off.
 503                                  */
 504                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 505                                     wh, "WEP", "%s", "PRIVACY off");
 506                                 vap->iv_stats.is_rx_noprivacy++;
 507                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 508                                 goto out;
 509                         }
 510                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 511                                 /* NB: stats+msgs handled in crypto_decap */
 512                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 513                                 goto out;
 514                         }
 515                         wh = mtod(m, struct ieee80211_frame *);
 516                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 517                         has_decrypted = 1;
 518                 } else {
 519                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 520                         key = NULL;
 521                 }
 522
 523                 /*
 524                  * Save QoS bits for use below--before we strip the header.
 525                  */
 526                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS_DATA)
 527                         qos = ieee80211_getqos(wh)[0];
 528                 else
 529                         qos = 0;
 530
 531                 /*
 532                  * Next up, any fragmentation.
 533                  */
 534                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 535                         m = ieee80211_defrag(ni, m, hdrspace, has_decrypted);
 536                         if (m == NULL) {
 537                                 /* Fragment dropped or frame not complete yet */
 538                                 goto out;
 539                         }
 540                 }
 541                 wh = NULL;              /* no longer valid, catch any uses */
 542
 543                 /*
 544                  * Next strip any MSDU crypto bits.
 545                  */
 546                 if (!ieee80211_crypto_demic(vap, key, m, 0)) {
 547                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 548                             ni->ni_macaddr, "data", "%s", "demic error");
 549                         vap->iv_stats.is_rx_demicfail++;
 550                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 551                         goto out;
 552                 }
 553
 554                 /* copy to listener after decrypt */
 555                 if (ieee80211_radiotap_active_vap(vap))
 556                         ieee80211_radiotap_rx(vap, m);
 557                 need_tap = 0;
 558
 559                 /*
 560                  * Finally, strip the 802.11 header.
 561                  */
 562                 m = ieee80211_decap(vap, m, hdrspace, qos);
 563                 if (m == NULL) {
 564                         /* XXX mask bit to check for both */
 565                         /* don't count Null data frames as errors */
 566                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 567                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 568                                 goto out;
 569                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 570                             ni->ni_macaddr, "data", "%s", "decap error");
 571                         vap->iv_stats.is_rx_decap++;
 572                         IEEE80211_NODE_STAT(ni, rx_decap);
 573                         goto err;
 574                 }
 575                 if (!(qos & IEEE80211_QOS_AMSDU))
 576                         eh = mtod(m, struct ether_header *);
 577                 else
 578                         eh = NULL;
 579                 if (!ieee80211_node_is_authorized(ni)) {
 580                         /*
 581                          * Deny any non-PAE frames received prior to
 582                          * authorization.  For open/shared-key
 583                          * authentication the port is mark authorized
 584                          * after authentication completes.  For 802.1x
 585                          * the port is not marked authorized by the
 586                          * authenticator until the handshake has completed.
 587                          */
 588                         if (eh == NULL ||
 589                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 590                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 591                                     ni->ni_macaddr, "data", "unauthorized or "
 592                                     "unknown port: ether type 0x%x len %u",
 593                                     eh == NULL ? -1 : eh->ether_type,
 594                                     m->m_pkthdr.len);
 595                                 vap->iv_stats.is_rx_unauth++;
 596                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 597                                 goto err;
 598                         }
 599                 } else {
 600                         /*
 601                          * When denying unencrypted frames, discard
 602                          * any non-PAE frames received without encryption.
 603                          */
 604                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 605                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 606                             (is_hw_decrypted == 0) &&
 607                             (eh == NULL ||
 608                              eh->ether_type != htons(ETHERTYPE_PAE))) {
 609                                 /*
 610                                  * Drop unencrypted frames.
 611                                  */
 612                                 vap->iv_stats.is_rx_unencrypted++;
 613                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 614                                 goto out;
 615                         }
 616                 }
 617                 /* XXX require HT? */
 618                 if (qos & IEEE80211_QOS_AMSDU) {
 619                         m = ieee80211_decap_amsdu(ni, m);
 620                         if (m == NULL)
 621                                 return IEEE80211_FC0_TYPE_DATA;
 622                 } else {
 623 #ifdef IEEE80211_SUPPORT_SUPERG
 624                         m = ieee80211_decap_fastframe(vap, ni, m);
 625                         if (m == NULL)
 626                                 return IEEE80211_FC0_TYPE_DATA;
 627 #endif
 628                 }
 629                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 630                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 631                 else
 632                         ieee80211_deliver_data(vap, ni, m);
 633                 return IEEE80211_FC0_TYPE_DATA;
 634
 635         case IEEE80211_FC0_TYPE_MGT:
 636                 vap->iv_stats.is_rx_mgmt++;
 637                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 638                 if (dir != IEEE80211_FC1_DIR_NODS) {
 639                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 640                             wh, "data", "incorrect dir 0x%x", dir);
 641                         vap->iv_stats.is_rx_wrongdir++;
 642                         goto err;
 643                 }
 644                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 645                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 646                             ni->ni_macaddr, "mgt", "too short: len %u",
 647                             m->m_pkthdr.len);
 648                         vap->iv_stats.is_rx_tooshort++;
 649                         goto out;
 650                 }
 651 #ifdef IEEE80211_DEBUG
 652                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 653                     ieee80211_msg_dumppkts(vap)) {
 654                         if_printf(ifp, "received %s from %s rssi %d\n",
 655                             ieee80211_mgt_subtype_name(subtype),
 656                             ether_sprintf(wh->i_addr2), rssi);
 657                 }
 658 #endif
 659                 if (IEEE80211_IS_PROTECTED(wh)) {
 660                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 661                             wh, NULL, "%s", "WEP set but not permitted");
 662                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 663                         goto out;
 664                 }
 665                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 666                 goto out;
 667
 668         case IEEE80211_FC0_TYPE_CTL:
 669                 vap->iv_stats.is_rx_ctl++;
 670                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 671                 vap->iv_recv_ctl(ni, m, subtype);
 672                 goto out;
 673
 674         default:
 675                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 676                     wh, "bad", "frame type 0x%x", type);
 677                 /* should not come here */
 678                 break;
 679         }
 680 err:
 681         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 682 out:
 683         if (m != NULL) {
 684                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 685                         ieee80211_radiotap_rx(vap, m);
 686                 m_freem(m);
 687         }
 688         return type;
 689 }
 690
 691 static int
 692 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 693 {
 694         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 695         int i;
 696
 697         /* NB: the 11b clients we care about will not have xrates */
 698         if (xrates != NULL || rates == NULL)
 699                 return 0;
 700         for (i = 0; i < rates[1]; i++) {
 701                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 702                 if (r > 2*11 || ((1<<r) & brates) == 0)
 703                         return 0;
 704         }
 705         return 1;
 706 }
 707
 708 static void
 709 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 710         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 711 {
 712         struct ieee80211vap *vap = ni->ni_vap;
 713         struct ieee80211com *ic = ni->ni_ic;
 714         struct ieee80211_channel *rxchan = ic->ic_curchan;
 715         struct ieee80211_frame *wh;
 716         uint8_t *frm, *efrm;
 717         uint8_t *ssid, *rates, *xrates;
 718 #if 0
 719         int ht_state_change = 0;
 720 #endif
 721
 722         wh = mtod(m0, struct ieee80211_frame *);
 723         frm = (uint8_t *)&wh[1];
 724         efrm = mtod(m0, uint8_t *) + m0->m_len;
 725
 726         IEEE80211_DPRINTF(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
 727             "%s: recv mgmt frame, addr2=%6D, ni=%p (%6D) fc=%.02x %.02x\n",
 728             __func__,
 729             wh->i_addr2, ":",
 730             ni,
 731             ni->ni_macaddr, ":",
 732             wh->i_fc[0],
 733             wh->i_fc[1]);
 734         switch (subtype) {
 735         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 736         case IEEE80211_FC0_SUBTYPE_BEACON: {
 737                 struct ieee80211_scanparams scan;
 738                 struct ieee80211_channel *c;
 739                 /*
 740                  * We process beacon/probe response
 741                  * frames to discover neighbors.
 742                  */
 743                 if (rxs != NULL) {
 744                         c = ieee80211_lookup_channel_rxstatus(vap, rxs);
 745                         if (c != NULL)
 746                                 rxchan = c;
 747                 }
 748                 if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0)
 749                         return;
 750                 /*
 751                  * Count frame now that we know it's to be processed.
 752                  */
 753                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 754                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 755                         IEEE80211_NODE_STAT(ni, rx_beacons);
 756                 } else
 757                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 758                 /*
 759                  * If scanning, just pass information to the scan module.
 760                  */
 761                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 762                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 763                                 /*
 764                                  * Actively scanning a channel marked passive;
 765                                  * send a probe request now that we know there
 766                                  * is 802.11 traffic present.
 767                                  *
 768                                  * XXX check if the beacon we recv'd gives
 769                                  * us what we need and suppress the probe req
 770                                  */
 771                                 ieee80211_probe_curchan(vap, 1);
 772                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 773                         }
 774                         ieee80211_add_scan(vap, rxchan, &scan, wh,
 775                             subtype, rssi, nf);
 776                         return;
 777                 }
 778                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 779                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 780                                 /*
 781                                  * Create a new entry in the neighbor table.
 782                                  *
 783                                  * XXX TODO:
 784                                  *
 785                                  * Here we're not scanning; so if we have an
 786                                  * SSID then make sure it matches our SSID.
 787                                  * Otherwise this code will match on all IBSS
 788                                  * beacons/probe requests for all SSIDs,
 789                                  * filling the node table with nodes that
 790                                  * aren't ours.
 791                                  */
 792                                 if (ieee80211_ibss_node_check_new(ni, &scan)) {
 793                                         ni = ieee80211_add_neighbor(vap, wh, &scan);
 794                                         /*
 795                                          * Send a probe request so we announce 11n
 796                                          * capabilities.
 797                                          */
 798                                         ieee80211_send_probereq(ni, /* node */
 799                                             vap->iv_myaddr, /* SA */
 800                                             ni->ni_macaddr, /* DA */
 801                                             vap->iv_bss->ni_bssid, /* BSSID */
 802                                             vap->iv_bss->ni_essid,
 803                                             vap->iv_bss->ni_esslen); /* SSID */
 804                                 } else
 805                                         ni = NULL;
 806
 807                                 /*
 808                                  * Send a probe request so we announce 11n
 809                                  * capabilities.
 810                                  *
 811                                  * Don't do this if we're scanning.
 812                                  */
 813                                 if (! (ic->ic_flags & IEEE80211_F_SCAN))
 814                                         ieee80211_send_probereq(ni, /* node */
 815                                                 vap->iv_myaddr, /* SA */
 816                                                 ni->ni_macaddr, /* DA */
 817                                                 vap->iv_bss->ni_bssid, /* BSSID */
 818                                                 vap->iv_bss->ni_essid,
 819                                                 vap->iv_bss->ni_esslen); /* SSID */
 820
 821                         } else if (ni->ni_capinfo == 0) {
 822                                 /*
 823                                  * Update faked node created on transmit.
 824                                  * Note this also updates the tsf.
 825                                  */
 826                                 ieee80211_init_neighbor(ni, wh, &scan);
 827
 828                                 /*
 829                                  * Send a probe request so we announce 11n
 830                                  * capabilities.
 831                                  */
 832                                 ieee80211_send_probereq(ni, /* node */
 833                                         vap->iv_myaddr, /* SA */
 834                                         ni->ni_macaddr, /* DA */
 835                                         vap->iv_bss->ni_bssid, /* BSSID */
 836                                         vap->iv_bss->ni_essid,
 837                                         vap->iv_bss->ni_esslen); /* SSID */
 838                         } else {
 839                                 /*
 840                                  * Record tsf for potential resync.
 841                                  */
 842                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 843                                         sizeof(ni->ni_tstamp));
 844                         }
 845                         /*
 846                          * This isn't enabled yet - otherwise it would
 847                          * update the HT parameters and channel width
 848                          * from any node, which could lead to lots of
 849                          * strange behaviour if the 11n nodes aren't
 850                          * exactly configured to match.
 851                          */
 852 #if 0
 853                         if (scan.htcap != NULL && scan.htinfo != NULL &&
 854                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
 855                                 ieee80211_ht_updateparams(ni,
 856                                     scan.htcap, scan.htinfo));
 857                                 if (ieee80211_ht_updateparams_final(ni,
 858                                     scan.htcap, scan.htinfo))
 859                                         ht_state_change = 1;
 860                         }
 861
 862                         /* XXX same for VHT? */
 863 #endif
 864                         if (ni != NULL) {
 865                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 866                                 ni->ni_noise = nf;
 867                         }
 868                         /*
 869                          * Same here - the channel width change should
 870                          * be applied to the specific peer node, not
 871                          * to the ic.  Ie, the interface configuration
 872                          * should stay in its current channel width;
 873                          * but it should change the rate control and
 874                          * any queued frames for the given node only.
 875                          *
 876                          * Since there's no (current) way to inform
 877                          * the driver that a channel width change has
 878                          * occurred for a single node, just stub this
 879                          * out.
 880                          */
 881 #if 0
 882                         if (ht_state_change)
 883                                 ieee80211_update_chw(ic);
 884 #endif
 885                 }
 886                 break;
 887         }
 888
 889         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 890                 if (vap->iv_state != IEEE80211_S_RUN) {
 891                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 892                             wh, NULL, "wrong state %s",
 893                             ieee80211_state_name[vap->iv_state]);
 894                         vap->iv_stats.is_rx_mgtdiscard++;
 895                         return;
 896                 }
 897                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 898                         /* frame must be directed */
 899                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 900                             wh, NULL, "%s", "not unicast");
 901                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 902                         return;
 903                 }
 904
 905                 /*
 906                  * prreq frame format
 907                  *      [tlv] ssid
 908                  *      [tlv] supported rates
 909                  *      [tlv] extended supported rates
 910                  */
 911                 ssid = rates = xrates = NULL;
 912                 while (efrm - frm > 1) {
 913                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 914                         switch (*frm) {
 915                         case IEEE80211_ELEMID_SSID:
 916                                 ssid = frm;
 917                                 break;
 918                         case IEEE80211_ELEMID_RATES:
 919                                 rates = frm;
 920                                 break;
 921                         case IEEE80211_ELEMID_XRATES:
 922                                 xrates = frm;
 923                                 break;
 924                         }
 925                         frm += frm[1] + 2;
 926                 }
 927                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 928                 if (xrates != NULL)
 929                         IEEE80211_VERIFY_ELEMENT(xrates,
 930                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 931                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 932                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 933                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 934                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 935                             wh, NULL,
 936                             "%s", "no ssid with ssid suppression enabled");
 937                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 938                         return;
 939                 }
 940
 941                 /* XXX find a better class or define it's own */
 942                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 943                     "%s", "recv probe req");
 944                 /*
 945                  * Some legacy 11b clients cannot hack a complete
 946                  * probe response frame.  When the request includes
 947                  * only a bare-bones rate set, communicate this to
 948                  * the transmit side.
 949                  */
 950                 ieee80211_send_proberesp(vap, wh->i_addr2,
 951                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 952
 953                 /*
 954                  * Note: we don't benefit from stashing the probe request
 955                  * IEs away to use for IBSS negotiation, because we
 956                  * typically don't get all of the IEs.
 957                  */
 958                 break;
 959
 960         case IEEE80211_FC0_SUBTYPE_ACTION:
 961         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 962                 if ((ni == vap->iv_bss) &&
 963                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 964                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 965                             wh, NULL, "%s", "unknown node");
 966                         vap->iv_stats.is_rx_mgtdiscard++;
 967                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 968                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 969                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
 970                             wh, NULL, "%s", "not for us");
 971                         vap->iv_stats.is_rx_mgtdiscard++;
 972                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 973                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_DEBUG,
 974                             wh, NULL, "wrong state %s",
 975                             ieee80211_state_name[vap->iv_state]);
 976                         vap->iv_stats.is_rx_mgtdiscard++;
 977                 } else {
 978                         if (ieee80211_parse_action(ni, m0) == 0)
 979                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 980                 }
 981                 break;
 982
 983         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 984         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 985         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 986         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 987         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 988         case IEEE80211_FC0_SUBTYPE_ATIM:
 989         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 990         case IEEE80211_FC0_SUBTYPE_AUTH:
 991         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 992                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 993                     wh, NULL, "%s", "not handled");
 994                 vap->iv_stats.is_rx_mgtdiscard++;
 995                 break;
 996
 997         default:
 998                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 999                     wh, "mgt", "subtype 0x%x not handled", subtype);
1000                 vap->iv_stats.is_rx_badsubtype++;
1001                 break;
1002         }
1003 }
1004 #undef IEEE80211_VERIFY_LENGTH
1005 #undef IEEE80211_VERIFY_ELEMENT
1006
1007 static void
1008 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1009         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1010 {
1011         struct ieee80211vap *vap = ni->ni_vap;
1012         struct ieee80211com *ic = ni->ni_ic;
1013
1014         /*
1015          * Process management frames when scanning; useful for doing
1016          * a site-survey.
1017          */
1018         if (ic->ic_flags & IEEE80211_F_SCAN)
1019                 adhoc_recv_mgmt(ni, m0, subtype, rxs, rssi, nf);
1020         else {
1021 #ifdef IEEE80211_DEBUG
1022                 struct ieee80211_frame *wh;
1023
1024                 wh = mtod(m0, struct ieee80211_frame *);
1025 #endif
1026                 switch (subtype) {
1027                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1028                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1029                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1030                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1031                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1032                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1033                 case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
1034                 case IEEE80211_FC0_SUBTYPE_BEACON:
1035                 case IEEE80211_FC0_SUBTYPE_ATIM:
1036                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1037                 case IEEE80211_FC0_SUBTYPE_AUTH:
1038                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1039                 case IEEE80211_FC0_SUBTYPE_ACTION:
1040                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
1041                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1042                              wh, NULL, "%s", "not handled");
1043                         vap->iv_stats.is_rx_mgtdiscard++;
1044                         break;
1045                 default:
1046                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1047                              wh, "mgt", "subtype 0x%x not handled", subtype);
1048                         vap->iv_stats.is_rx_badsubtype++;
1049                         break;
1050                 }
1051         }
1052 }
1053
1054 static void
1055 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
1056 {
1057
1058         switch (subtype) {
1059         case IEEE80211_FC0_SUBTYPE_BAR:
1060                 ieee80211_recv_bar(ni, m);
1061                 break;
1062         }
1063 }