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
  67 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  68
  69 static  void adhoc_vattach(struct ieee80211vap *);
  70 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  71 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
  72 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  73         int subtype, int, int);
  74 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  75         int subtype, int, int);
  76 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
  77
  78 void
  79 ieee80211_adhoc_attach(struct ieee80211com *ic)
  80 {
  81         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
  82         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
  83 }
  84
  85 void
  86 ieee80211_adhoc_detach(struct ieee80211com *ic)
  87 {
  88 }
  89
  90 static void
  91 adhoc_vdetach(struct ieee80211vap *vap)
  92 {
  93 }
  94
  95 static void
  96 adhoc_vattach(struct ieee80211vap *vap)
  97 {
  98         vap->iv_newstate = adhoc_newstate;
  99         vap->iv_input = adhoc_input;
 100         if (vap->iv_opmode == IEEE80211_M_IBSS)
 101                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
 102         else
 103                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
 104         vap->iv_recv_ctl = adhoc_recv_ctl;
 105         vap->iv_opdetach = adhoc_vdetach;
 106 #ifdef IEEE80211_SUPPORT_TDMA
 107         /*
 108          * Throw control to tdma support.  Note we do this
 109          * after setting up our callbacks so it can piggyback
 110          * on top of us.
 111          */
 112         if (vap->iv_caps & IEEE80211_C_TDMA)
 113                 ieee80211_tdma_vattach(vap);
 114 #endif
 115 }
 116
 117 static void
 118 sta_leave(void *arg, struct ieee80211_node *ni)
 119 {
 120         struct ieee80211vap *vap = arg;
 121
 122         if (ni->ni_vap == vap && ni != vap->iv_bss)
 123                 ieee80211_node_leave(ni);
 124 }
 125
 126 /*
 127  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
 128  */
 129 static int
 130 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 131 {
 132         struct ieee80211com *ic = vap->iv_ic;
 133         struct ieee80211_node *ni;
 134         enum ieee80211_state ostate;
 135
 136         IEEE80211_LOCK_ASSERT(vap->iv_ic);
 137
 138         ostate = vap->iv_state;
 139         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 140             __func__, ieee80211_state_name[ostate],
 141             ieee80211_state_name[nstate], arg);
 142         vap->iv_state = nstate;                 /* state transition */
 143         if (ostate != IEEE80211_S_SCAN)
 144                 ieee80211_cancel_scan(vap);     /* background scan */
 145         ni = vap->iv_bss;                       /* NB: no reference held */
 146         switch (nstate) {
 147         case IEEE80211_S_INIT:
 148                 switch (ostate) {
 149                 case IEEE80211_S_SCAN:
 150                         ieee80211_cancel_scan(vap);
 151                         break;
 152                 default:
 153                         break;
 154                 }
 155                 if (ostate != IEEE80211_S_INIT) {
 156                         /* NB: optimize INIT -> INIT case */
 157                         ieee80211_reset_bss(vap);
 158                 }
 159                 break;
 160         case IEEE80211_S_SCAN:
 161                 switch (ostate) {
 162                 case IEEE80211_S_RUN:           /* beacon miss */
 163                         /* purge station table; entries are stale */
 164                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
 165                         /* fall thru... */
 166                 case IEEE80211_S_INIT:
 167                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 168                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 169                                 /*
 170                                  * Already have a channel; bypass the
 171                                  * scan and startup immediately.
 172                                  */
 173                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 174                                 break;
 175                         }
 176                         /*
 177                          * Initiate a scan.  We can come here as a result
 178                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 179                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 180                          * and the scan request parameters will be present
 181                          * in iv_scanreq.  Otherwise we do the default.
 182                          */
 183                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 184                                 ieee80211_check_scan(vap,
 185                                     vap->iv_scanreq_flags,
 186                                     vap->iv_scanreq_duration,
 187                                     vap->iv_scanreq_mindwell,
 188                                     vap->iv_scanreq_maxdwell,
 189                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 190                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 191                         } else
 192                                 ieee80211_check_scan_current(vap);
 193                         break;
 194                 case IEEE80211_S_SCAN:
 195                         /*
 196                          * This can happen because of a change in state
 197                          * that requires a reset.  Trigger a new scan
 198                          * unless we're in manual roaming mode in which
 199                          * case an application must issue an explicit request.
 200                          */
 201                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
 202                                 ieee80211_check_scan_current(vap);
 203                         break;
 204                 default:
 205                         goto invalid;
 206                 }
 207                 break;
 208         case IEEE80211_S_RUN:
 209                 if (vap->iv_flags & IEEE80211_F_WPA) {
 210                         /* XXX validate prerequisites */
 211                 }
 212                 switch (ostate) {
 213                 case IEEE80211_S_SCAN:
 214 #ifdef IEEE80211_DEBUG
 215                         if (ieee80211_msg_debug(vap)) {
 216                                 ieee80211_note(vap,
 217                                     "synchronized with %s ssid ",
 218                                     ether_sprintf(ni->ni_bssid));
 219                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
 220                                     ni->ni_esslen);
 221                                 /* XXX MCS/HT */
 222                                 printf(" channel %d start %uMb\n",
 223                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 224                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 225                         }
 226 #endif
 227                         break;
 228                 default:
 229                         goto invalid;
 230                 }
 231                 /*
 232                  * When 802.1x is not in use mark the port authorized
 233                  * at this point so traffic can flow.
 234                  */
 235                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 236                         ieee80211_node_authorize(ni);
 237                 /*
 238                  * Fake association when joining an existing bss.
 239                  */
 240                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
 241                     ic->ic_newassoc != NULL)
 242                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
 243                 break;
 244         case IEEE80211_S_SLEEP:
 245                 ieee80211_sta_pwrsave(vap, 0);
 246                 break;
 247         default:
 248         invalid:
 249                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
 250                     "%s: unexpected state transition %s -> %s\n", __func__,
 251                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 252                 break;
 253         }
 254         return 0;
 255 }
 256
 257 /*
 258  * Decide if a received management frame should be
 259  * printed when debugging is enabled.  This filters some
 260  * of the less interesting frames that come frequently
 261  * (e.g. beacons).
 262  */
 263 static __inline int
 264 doprint(struct ieee80211vap *vap, int subtype)
 265 {
 266         switch (subtype) {
 267         case IEEE80211_FC0_SUBTYPE_BEACON:
 268                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 269         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 270                 return 1;
 271         }
 272         return 1;
 273 }
 274
 275 /*
 276  * Process a received frame.  The node associated with the sender
 277  * should be supplied.  If nothing was found in the node table then
 278  * the caller is assumed to supply a reference to iv_bss instead.
 279  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 280  * during AP scanning to select a AP to associate with; it can have
 281  * any units so long as values have consistent units and higher values
 282  * mean ``better signal''.  The receive timestamp is currently not used
 283  * by the 802.11 layer.
 284  */
 285 static int
 286 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 287 {
 288 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 289 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 290         struct ieee80211vap *vap = ni->ni_vap;
 291         struct ieee80211com *ic = ni->ni_ic;
 292         struct ifnet *ifp = vap->iv_ifp;
 293         struct ieee80211_frame *wh;
 294         struct ieee80211_key *key;
 295         struct ether_header *eh;
 296         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 297         uint8_t dir, type, subtype, qos;
 298         uint8_t *bssid;
 299         uint16_t rxseq;
 300
 301         if (m->m_flags & M_AMPDU_MPDU) {
 302                 /*
 303                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 304                  * w/ M_AMPDU_MPDU marked have already passed through
 305                  * here but were received out of order and been held on
 306                  * the reorder queue.  When resubmitted they are marked
 307                  * with the M_AMPDU_MPDU flag and we can bypass most of
 308                  * the normal processing.
 309                  */
 310                 wh = mtod(m, struct ieee80211_frame *);
 311                 type = IEEE80211_FC0_TYPE_DATA;
 312                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 313                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 314                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 315                 goto resubmit_ampdu;
 316         }
 317
 318         KASSERT(ni != NULL, ("null node"));
 319         ni->ni_inact = ni->ni_inact_reload;
 320
 321         type = -1;                      /* undefined */
 322
 323         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 324                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 325                     ni->ni_macaddr, NULL,
 326                     "too short (1): len %u", m->m_pkthdr.len);
 327                 vap->iv_stats.is_rx_tooshort++;
 328                 goto out;
 329         }
 330         /*
 331          * Bit of a cheat here, we use a pointer for a 3-address
 332          * frame format but don't reference fields past outside
 333          * ieee80211_frame_min w/o first validating the data is
 334          * present.
 335          */
 336         wh = mtod(m, struct ieee80211_frame *);
 337
 338         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 339             IEEE80211_FC0_VERSION_0) {
 340                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 341                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 342                     wh->i_fc[0], wh->i_fc[1]);
 343                 vap->iv_stats.is_rx_badversion++;
 344                 goto err;
 345         }
 346
 347         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 348         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 349         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 350         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 351                 if (dir != IEEE80211_FC1_DIR_NODS)
 352                         bssid = wh->i_addr1;
 353                 else if (type == IEEE80211_FC0_TYPE_CTL)
 354                         bssid = wh->i_addr1;
 355                 else {
 356                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 357                                 IEEE80211_DISCARD_MAC(vap,
 358                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 359                                     NULL, "too short (2): len %u",
 360                                     m->m_pkthdr.len);
 361                                 vap->iv_stats.is_rx_tooshort++;
 362                                 goto out;
 363                         }
 364                         bssid = wh->i_addr3;
 365                 }
 366                 /*
 367                  * Validate the bssid.
 368                  */
 369                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 370                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 371                         /* not interested in */
 372                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 373                             bssid, NULL, "%s", "not to bss");
 374                         vap->iv_stats.is_rx_wrongbss++;
 375                         goto out;
 376                 }
 377                 /*
 378                  * Data frame, cons up a node when it doesn't
 379                  * exist. This should probably done after an ACL check.
 380                  */
 381                 if (type == IEEE80211_FC0_TYPE_DATA &&
 382                     ni == vap->iv_bss &&
 383                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 384                         /*
 385                          * Beware of frames that come in too early; we
 386                          * can receive broadcast frames and creating sta
 387                          * entries will blow up because there is no bss
 388                          * channel yet.
 389                          */
 390                         if (vap->iv_state != IEEE80211_S_RUN) {
 391                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 392                                     wh, "data", "not in RUN state (%s)",
 393                                     ieee80211_state_name[vap->iv_state]);
 394                                 vap->iv_stats.is_rx_badstate++;
 395                                 goto err;
 396                         }
 397                         /*
 398                          * Fake up a node for this newly
 399                          * discovered member of the IBSS.
 400                          */
 401                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
 402                         if (ni == NULL) {
 403                                 /* NB: stat kept for alloc failure */
 404                                 goto err;
 405                         }
 406                 }
 407                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 408                 ni->ni_noise = nf;
 409                 if (HAS_SEQ(type)) {
 410                         uint8_t tid = ieee80211_gettid(wh);
 411                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 412                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 413                                 ic->ic_wme.wme_hipri_traffic++;
 414                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 415                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 416                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 417                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 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_WEP) {
 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_WEP;
 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_WEP) {
 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 #undef SEQ_LEQ
 664 }
 665
 666 static int
 667 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 668 {
 669         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 670         int i;
 671
 672         /* NB: the 11b clients we care about will not have xrates */
 673         if (xrates != NULL || rates == NULL)
 674                 return 0;
 675         for (i = 0; i < rates[1]; i++) {
 676                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 677                 if (r > 2*11 || ((1<<r) & brates) == 0)
 678                         return 0;
 679         }
 680         return 1;
 681 }
 682
 683 static void
 684 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 685         int subtype, int rssi, int nf)
 686 {
 687         struct ieee80211vap *vap = ni->ni_vap;
 688         struct ieee80211com *ic = ni->ni_ic;
 689         struct ieee80211_frame *wh;
 690         uint8_t *frm, *efrm, *sfrm;
 691         uint8_t *ssid, *rates, *xrates;
 692
 693         wh = mtod(m0, struct ieee80211_frame *);
 694         frm = (uint8_t *)&wh[1];
 695         efrm = mtod(m0, uint8_t *) + m0->m_len;
 696         switch (subtype) {
 697         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 698         case IEEE80211_FC0_SUBTYPE_BEACON: {
 699                 struct ieee80211_scanparams scan;
 700                 /*
 701                  * We process beacon/probe response
 702                  * frames to discover neighbors.
 703                  */
 704                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
 705                         return;
 706                 /*
 707                  * Count frame now that we know it's to be processed.
 708                  */
 709                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 710                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 711                         IEEE80211_NODE_STAT(ni, rx_beacons);
 712                 } else
 713                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 714                 /*
 715                  * If scanning, just pass information to the scan module.
 716                  */
 717                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 718                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
 719                                 /*
 720                                  * Actively scanning a channel marked passive;
 721                                  * send a probe request now that we know there
 722                                  * is 802.11 traffic present.
 723                                  *
 724                                  * XXX check if the beacon we recv'd gives
 725                                  * us what we need and suppress the probe req
 726                                  */
 727                                 ieee80211_probe_curchan(vap, 1);
 728                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 729                         }
 730                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 731                         return;
 732                 }
 733                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
 734                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
 735                                 /*
 736                                  * Create a new entry in the neighbor table.
 737                                  */
 738                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
 739                         } else if (ni->ni_capinfo == 0) {
 740                                 /*
 741                                  * Update faked node created on transmit.
 742                                  * Note this also updates the tsf.
 743                                  */
 744                                 ieee80211_init_neighbor(ni, wh, &scan);
 745                         } else {
 746                                 /*
 747                                  * Record tsf for potential resync.
 748                                  */
 749                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
 750                                         sizeof(ni->ni_tstamp));
 751                         }
 752                         if (ni != NULL) {
 753                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 754                                 ni->ni_noise = nf;
 755                         }
 756                 }
 757                 break;
 758         }
 759
 760         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 761                 if (vap->iv_state != IEEE80211_S_RUN) {
 762                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 763                             wh, NULL, "wrong state %s",
 764                             ieee80211_state_name[vap->iv_state]);
 765                         vap->iv_stats.is_rx_mgtdiscard++;
 766                         return;
 767                 }
 768                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 769                         /* frame must be directed */
 770                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 771                             wh, NULL, "%s", "not unicast");
 772                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 773                         return;
 774                 }
 775
 776                 /*
 777                  * prreq frame format
 778                  *      [tlv] ssid
 779                  *      [tlv] supported rates
 780                  *      [tlv] extended supported rates
 781                  */
 782                 ssid = rates = xrates = NULL;
 783                 sfrm = frm;
 784                 while (efrm - frm > 1) {
 785                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 786                         switch (*frm) {
 787                         case IEEE80211_ELEMID_SSID:
 788                                 ssid = frm;
 789                                 break;
 790                         case IEEE80211_ELEMID_RATES:
 791                                 rates = frm;
 792                                 break;
 793                         case IEEE80211_ELEMID_XRATES:
 794                                 xrates = frm;
 795                                 break;
 796                         }
 797                         frm += frm[1] + 2;
 798                 }
 799                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 800                 if (xrates != NULL)
 801                         IEEE80211_VERIFY_ELEMENT(xrates,
 802                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 803                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 804                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 805                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 806                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 807                             wh, NULL,
 808                             "%s", "no ssid with ssid suppression enabled");
 809                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 810                         return;
 811                 }
 812
 813                 /* XXX find a better class or define it's own */
 814                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 815                     "%s", "recv probe req");
 816                 /*
 817                  * Some legacy 11b clients cannot hack a complete
 818                  * probe response frame.  When the request includes
 819                  * only a bare-bones rate set, communicate this to
 820                  * the transmit side.
 821                  */
 822                 ieee80211_send_proberesp(vap, wh->i_addr2,
 823                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 824                 break;
 825
 826         case IEEE80211_FC0_SUBTYPE_ACTION: {
 827                 const struct ieee80211_action *ia;
 828
 829                 if (vap->iv_state != IEEE80211_S_RUN) {
 830                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 831                             wh, NULL, "wrong state %s",
 832                             ieee80211_state_name[vap->iv_state]);
 833                         vap->iv_stats.is_rx_mgtdiscard++;
 834                         return;
 835                 }
 836                 /*
 837                  * action frame format:
 838                  *      [1] category
 839                  *      [1] action
 840                  *      [tlv] parameters
 841                  */
 842                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 843                         sizeof(struct ieee80211_action), return);
 844                 ia = (const struct ieee80211_action *) frm;
 845
 846                 vap->iv_stats.is_rx_action++;
 847                 IEEE80211_NODE_STAT(ni, rx_action);
 848
 849                 /* verify frame payloads but defer processing */
 850                 /* XXX maybe push this to method */
 851                 switch (ia->ia_category) {
 852                 case IEEE80211_ACTION_CAT_BA:
 853                         switch (ia->ia_action) {
 854                         case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 855                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 856                                     sizeof(struct ieee80211_action_ba_addbarequest),
 857                                     return);
 858                                 break;
 859                         case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 860                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 861                                     sizeof(struct ieee80211_action_ba_addbaresponse),
 862                                     return);
 863                                 break;
 864                         case IEEE80211_ACTION_BA_DELBA:
 865                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 866                                     sizeof(struct ieee80211_action_ba_delba),
 867                                     return);
 868                                 break;
 869                         }
 870                         break;
 871                 case IEEE80211_ACTION_CAT_HT:
 872                         switch (ia->ia_action) {
 873                         case IEEE80211_ACTION_HT_TXCHWIDTH:
 874                                 IEEE80211_VERIFY_LENGTH(efrm - frm,
 875                                     sizeof(struct ieee80211_action_ht_txchwidth),
 876                                     return);
 877                                 break;
 878                         }
 879                         break;
 880                 }
 881                 ic->ic_recv_action(ni, wh, frm, efrm);
 882                 break;
 883         }
 884
 885         case IEEE80211_FC0_SUBTYPE_AUTH:
 886         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 887         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 888         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 889         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 890         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 891         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 892                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 893                      wh, NULL, "%s", "not handled");
 894                 vap->iv_stats.is_rx_mgtdiscard++;
 895                 return;
 896
 897         default:
 898                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 899                      wh, "mgt", "subtype 0x%x not handled", subtype);
 900                 vap->iv_stats.is_rx_badsubtype++;
 901                 break;
 902         }
 903 }
 904 #undef IEEE80211_VERIFY_LENGTH
 905 #undef IEEE80211_VERIFY_ELEMENT
 906
 907 static void
 908 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 909         int subtype, int rssi, int nf)
 910 {
 911         struct ieee80211vap *vap = ni->ni_vap;
 912         struct ieee80211com *ic = ni->ni_ic;
 913
 914         /*
 915          * Process management frames when scanning; useful for doing
 916          * a site-survey.
 917          */
 918         if (ic->ic_flags & IEEE80211_F_SCAN)
 919                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
 920         else
 921                 vap->iv_stats.is_rx_mgtdiscard++;
 922 }
 923
 924 static void
 925 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype)
 926 {
 927 }