sys/net80211/ieee80211_hostap.c

   1 /*-
   2  * Copyright (c) 2007-2008 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 HOSTAP 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_hostap.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63 #include <net80211/ieee80211_wds.h>
  64
  65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  66
  67 static  void hostap_vattach(struct ieee80211vap *);
  68 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  69 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  70             int rssi, int nf);
  71 static void hostap_deliver_data(struct ieee80211vap *,
  72             struct ieee80211_node *, struct mbuf *);
  73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  74             int subtype, int rssi, int nf);
  75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
  77
  78 void
  79 ieee80211_hostap_attach(struct ieee80211com *ic)
  80 {
  81         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  82 }
  83
  84 void
  85 ieee80211_hostap_detach(struct ieee80211com *ic)
  86 {
  87 }
  88
  89 static void
  90 hostap_vdetach(struct ieee80211vap *vap)
  91 {
  92 }
  93
  94 static void
  95 hostap_vattach(struct ieee80211vap *vap)
  96 {
  97         vap->iv_newstate = hostap_newstate;
  98         vap->iv_input = hostap_input;
  99         vap->iv_recv_mgmt = hostap_recv_mgmt;
 100         vap->iv_recv_ctl = hostap_recv_ctl;
 101         vap->iv_opdetach = hostap_vdetach;
 102         vap->iv_deliver_data = hostap_deliver_data;
 103 }
 104
 105 static void
 106 sta_disassoc(void *arg, struct ieee80211_node *ni)
 107 {
 108         struct ieee80211vap *vap = arg;
 109
 110         if (ni->ni_vap == vap && ni->ni_associd != 0) {
 111                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 112                         IEEE80211_REASON_ASSOC_LEAVE);
 113                 ieee80211_node_leave(ni);
 114         }
 115 }
 116
 117 static void
 118 sta_csa(void *arg, struct ieee80211_node *ni)
 119 {
 120         struct ieee80211vap *vap = arg;
 121
 122         if (ni->ni_vap == vap && ni->ni_associd != 0)
 123                 if (ni->ni_inact > vap->iv_inact_init) {
 124                         ni->ni_inact = vap->iv_inact_init;
 125                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 126                             "%s: inact %u", __func__, ni->ni_inact);
 127                 }
 128 }
 129
 130 static void
 131 sta_drop(void *arg, struct ieee80211_node *ni)
 132 {
 133         struct ieee80211vap *vap = arg;
 134
 135         if (ni->ni_vap == vap && ni->ni_associd != 0)
 136                 ieee80211_node_leave(ni);
 137 }
 138
 139 /*
 140  * Does a channel change require associated stations to re-associate
 141  * so protocol state is correct.  This is used when doing CSA across
 142  * bands or similar (e.g. HT -> legacy).
 143  */
 144 static int
 145 isbandchange(struct ieee80211com *ic)
 146 {
 147         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 148             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 149              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 150 }
 151
 152 /*
 153  * IEEE80211_M_HOSTAP vap state machine handler.
 154  */
 155 static int
 156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 157 {
 158         struct ieee80211com *ic = vap->iv_ic;
 159         enum ieee80211_state ostate;
 160
 161         IEEE80211_LOCK_ASSERT(ic);
 162
 163         ostate = vap->iv_state;
 164         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 165             __func__, ieee80211_state_name[ostate],
 166             ieee80211_state_name[nstate], arg);
 167         vap->iv_state = nstate;                 /* state transition */
 168         if (ostate != IEEE80211_S_SCAN)
 169                 ieee80211_cancel_scan(vap);     /* background scan */
 170         switch (nstate) {
 171         case IEEE80211_S_INIT:
 172                 switch (ostate) {
 173                 case IEEE80211_S_SCAN:
 174                         ieee80211_cancel_scan(vap);
 175                         break;
 176                 case IEEE80211_S_CAC:
 177                         ieee80211_dfs_cac_stop(vap);
 178                         break;
 179                 case IEEE80211_S_RUN:
 180                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 181                         break;
 182                 default:
 183                         break;
 184                 }
 185                 if (ostate != IEEE80211_S_INIT) {
 186                         /* NB: optimize INIT -> INIT case */
 187                         ieee80211_reset_bss(vap);
 188                 }
 189                 if (vap->iv_auth->ia_detach != NULL)
 190                         vap->iv_auth->ia_detach(vap);
 191                 break;
 192         case IEEE80211_S_SCAN:
 193                 switch (ostate) {
 194                 case IEEE80211_S_CSA:
 195                 case IEEE80211_S_RUN:
 196                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 197                         /*
 198                          * Clear overlapping BSS state; the beacon frame
 199                          * will be reconstructed on transition to the RUN
 200                          * state and the timeout routines check if the flag
 201                          * is set before doing anything so this is sufficient.
 202                          */
 203                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 204                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 205                         /* fall thru... */
 206                 case IEEE80211_S_CAC:
 207                         /*
 208                          * NB: We may get here because of a manual channel
 209                          *     change in which case we need to stop CAC
 210                          * XXX no need to stop if ostate RUN but it's ok
 211                          */
 212                         ieee80211_dfs_cac_stop(vap);
 213                         /* fall thru... */
 214                 case IEEE80211_S_INIT:
 215                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 216                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 217                                 /*
 218                                  * Already have a channel; bypass the
 219                                  * scan and startup immediately.
 220                                  * ieee80211_create_ibss will call back to
 221                                  * move us to RUN state.
 222                                  */
 223                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 224                                 break;
 225                         }
 226                         /*
 227                          * Initiate a scan.  We can come here as a result
 228                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 229                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 230                          * and the scan request parameters will be present
 231                          * in iv_scanreq.  Otherwise we do the default.
 232                          */
 233                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 234                                 ieee80211_check_scan(vap,
 235                                     vap->iv_scanreq_flags,
 236                                     vap->iv_scanreq_duration,
 237                                     vap->iv_scanreq_mindwell,
 238                                     vap->iv_scanreq_maxdwell,
 239                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 240                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 241                         } else
 242                                 ieee80211_check_scan_current(vap);
 243                         break;
 244                 case IEEE80211_S_SCAN:
 245                         /*
 246                          * A state change requires a reset; scan.
 247                          */
 248                         ieee80211_check_scan_current(vap);
 249                         break;
 250                 default:
 251                         break;
 252                 }
 253                 break;
 254         case IEEE80211_S_CAC:
 255                 /*
 256                  * Start CAC on a DFS channel.  We come here when starting
 257                  * a bss on a DFS channel (see ieee80211_create_ibss).
 258                  */
 259                 ieee80211_dfs_cac_start(vap);
 260                 break;
 261         case IEEE80211_S_RUN:
 262                 if (vap->iv_flags & IEEE80211_F_WPA) {
 263                         /* XXX validate prerequisites */
 264                 }
 265                 switch (ostate) {
 266                 case IEEE80211_S_INIT:
 267                         /*
 268                          * Already have a channel; bypass the
 269                          * scan and startup immediately.
 270                          * Note that ieee80211_create_ibss will call
 271                          * back to do a RUN->RUN state change.
 272                          */
 273                         ieee80211_create_ibss(vap,
 274                             ieee80211_ht_adjust_channel(ic,
 275                                 ic->ic_curchan, vap->iv_flags_ht));
 276                         /* NB: iv_bss is changed on return */
 277                         break;
 278                 case IEEE80211_S_CAC:
 279                         /*
 280                          * NB: This is the normal state change when CAC
 281                          * expires and no radar was detected; no need to
 282                          * clear the CAC timer as it's already expired.
 283                          */
 284                         /* fall thru... */
 285                 case IEEE80211_S_CSA:
 286                         /*
 287                          * Shorten inactivity timer of associated stations
 288                          * to weed out sta's that don't follow a CSA.
 289                          */
 290                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
 291                         /*
 292                          * Update bss node channel to reflect where
 293                          * we landed after CSA.
 294                          */
 295                         ieee80211_node_set_chan(vap->iv_bss,
 296                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
 297                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
 298                         /* XXX bypass debug msgs */
 299                         break;
 300                 case IEEE80211_S_SCAN:
 301                 case IEEE80211_S_RUN:
 302 #ifdef IEEE80211_DEBUG
 303                         if (ieee80211_msg_debug(vap)) {
 304                                 struct ieee80211_node *ni = vap->iv_bss;
 305                                 ieee80211_note(vap,
 306                                     "synchronized with %s ssid ",
 307                                     ether_sprintf(ni->ni_bssid));
 308                                 ieee80211_print_essid(ni->ni_essid,
 309                                     ni->ni_esslen);
 310                                 /* XXX MCS/HT */
 311                                 printf(" channel %d start %uMb\n",
 312                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 313                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 314                         }
 315 #endif
 316                         break;
 317                 default:
 318                         break;
 319                 }
 320                 /*
 321                  * Start/stop the authenticator.  We delay until here
 322                  * to allow configuration to happen out of order.
 323                  */
 324                 if (vap->iv_auth->ia_attach != NULL) {
 325                         /* XXX check failure */
 326                         vap->iv_auth->ia_attach(vap);
 327                 } else if (vap->iv_auth->ia_detach != NULL) {
 328                         vap->iv_auth->ia_detach(vap);
 329                 }
 330                 ieee80211_node_authorize(vap->iv_bss);
 331                 break;
 332         case IEEE80211_S_CSA:
 333                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
 334                         /*
 335                          * On a ``band change'' silently drop associated
 336                          * stations as they must re-associate before they
 337                          * can pass traffic (as otherwise protocol state
 338                          * such as capabilities and the negotiated rate
 339                          * set may/will be wrong).
 340                          */
 341                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
 342                 }
 343                 break;
 344         default:
 345                 break;
 346         }
 347         return 0;
 348 }
 349
 350 static void
 351 hostap_deliver_data(struct ieee80211vap *vap,
 352         struct ieee80211_node *ni, struct mbuf *m)
 353 {
 354         struct ether_header *eh = mtod(m, struct ether_header *);
 355         struct ifnet *ifp = vap->iv_ifp;
 356
 357         /* clear driver/net80211 flags before passing up */
 358         m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
 359
 360         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
 361             ("gack, opmode %d", vap->iv_opmode));
 362         /*
 363          * Do accounting.
 364          */
 365         ifp->if_ipackets++;
 366         IEEE80211_NODE_STAT(ni, rx_data);
 367         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 368         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 369                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
 370                 IEEE80211_NODE_STAT(ni, rx_mcast);
 371         } else
 372                 IEEE80211_NODE_STAT(ni, rx_ucast);
 373
 374         /* perform as a bridge within the AP */
 375         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
 376                 struct mbuf *mcopy = NULL;
 377
 378                 if (m->m_flags & M_MCAST) {
 379                         mcopy = m_dup(m, M_DONTWAIT);
 380                         if (mcopy == NULL)
 381                                 ifp->if_oerrors++;
 382                         else
 383                                 mcopy->m_flags |= M_MCAST;
 384                 } else {
 385                         /*
 386                          * Check if the destination is associated with the
 387                          * same vap and authorized to receive traffic.
 388                          * Beware of traffic destined for the vap itself;
 389                          * sending it will not work; just let it be delivered
 390                          * normally.
 391                          */
 392                         struct ieee80211_node *sta = ieee80211_find_vap_node(
 393                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
 394                         if (sta != NULL) {
 395                                 if (ieee80211_node_is_authorized(sta)) {
 396                                         /*
 397                                          * Beware of sending to ourself; this
 398                                          * needs to happen via the normal
 399                                          * input path.
 400                                          */
 401                                         if (sta != vap->iv_bss) {
 402                                                 mcopy = m;
 403                                                 m = NULL;
 404                                         }
 405                                 } else {
 406                                         vap->iv_stats.is_rx_unauth++;
 407                                         IEEE80211_NODE_STAT(sta, rx_unauth);
 408                                 }
 409                                 ieee80211_free_node(sta);
 410                         }
 411                 }
 412                 if (mcopy != NULL) {
 413                         int len, err;
 414                         len = mcopy->m_pkthdr.len;
 415                         err = ifp->if_transmit(ifp, mcopy);
 416                         if (err) {
 417                                 /* NB: IFQ_HANDOFF reclaims mcopy */
 418                         } else {
 419                                 ifp->if_opackets++;
 420                         }
 421                 }
 422         }
 423         if (m != NULL) {
 424                 /*
 425                  * Mark frame as coming from vap's interface.
 426                  */
 427                 m->m_pkthdr.rcvif = ifp;
 428                 if (m->m_flags & M_MCAST) {
 429                         /*
 430                          * Spam DWDS vap's w/ multicast traffic.
 431                          */
 432                         /* XXX only if dwds in use? */
 433                         ieee80211_dwds_mcast(vap, m);
 434                 }
 435                 if (ni->ni_vlan != 0) {
 436                         /* attach vlan tag */
 437                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
 438                         m->m_flags |= M_VLANTAG;
 439                 }
 440                 ifp->if_input(ifp, m);
 441         }
 442 }
 443
 444 /*
 445  * Decide if a received management frame should be
 446  * printed when debugging is enabled.  This filters some
 447  * of the less interesting frames that come frequently
 448  * (e.g. beacons).
 449  */
 450 static __inline int
 451 doprint(struct ieee80211vap *vap, int subtype)
 452 {
 453         switch (subtype) {
 454         case IEEE80211_FC0_SUBTYPE_BEACON:
 455                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 456         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 457                 return 0;
 458         }
 459         return 1;
 460 }
 461
 462 /*
 463  * Process a received frame.  The node associated with the sender
 464  * should be supplied.  If nothing was found in the node table then
 465  * the caller is assumed to supply a reference to iv_bss instead.
 466  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 467  * during AP scanning to select a AP to associate with; it can have
 468  * any units so long as values have consistent units and higher values
 469  * mean ``better signal''.  The receive timestamp is currently not used
 470  * by the 802.11 layer.
 471  */
 472 static int
 473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 474 {
 475 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 476 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 477         struct ieee80211vap *vap = ni->ni_vap;
 478         struct ieee80211com *ic = ni->ni_ic;
 479         struct ifnet *ifp = vap->iv_ifp;
 480         struct ieee80211_frame *wh;
 481         struct ieee80211_key *key;
 482         struct ether_header *eh;
 483         int hdrspace, need_tap;
 484         uint8_t dir, type, subtype, qos;
 485         uint8_t *bssid;
 486         uint16_t rxseq;
 487
 488         if (m->m_flags & M_AMPDU_MPDU) {
 489                 /*
 490                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 491                  * w/ M_AMPDU_MPDU marked have already passed through
 492                  * here but were received out of order and been held on
 493                  * the reorder queue.  When resubmitted they are marked
 494                  * with the M_AMPDU_MPDU flag and we can bypass most of
 495                  * the normal processing.
 496                  */
 497                 wh = mtod(m, struct ieee80211_frame *);
 498                 type = IEEE80211_FC0_TYPE_DATA;
 499                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 500                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 501                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 502                 goto resubmit_ampdu;
 503         }
 504
 505         KASSERT(ni != NULL, ("null node"));
 506         ni->ni_inact = ni->ni_inact_reload;
 507
 508         need_tap = 1;                   /* mbuf need to be tapped. */
 509         type = -1;                      /* undefined */
 510
 511         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 512                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 513                     ni->ni_macaddr, NULL,
 514                     "too short (1): len %u", m->m_pkthdr.len);
 515                 vap->iv_stats.is_rx_tooshort++;
 516                 goto out;
 517         }
 518         /*
 519          * Bit of a cheat here, we use a pointer for a 3-address
 520          * frame format but don't reference fields past outside
 521          * ieee80211_frame_min w/o first validating the data is
 522          * present.
 523          */
 524         wh = mtod(m, struct ieee80211_frame *);
 525
 526         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 527             IEEE80211_FC0_VERSION_0) {
 528                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 529                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 530                     wh->i_fc[0], wh->i_fc[1]);
 531                 vap->iv_stats.is_rx_badversion++;
 532                 goto err;
 533         }
 534
 535         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 536         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 537         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 538         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 539                 if (dir != IEEE80211_FC1_DIR_NODS)
 540                         bssid = wh->i_addr1;
 541                 else if (type == IEEE80211_FC0_TYPE_CTL)
 542                         bssid = wh->i_addr1;
 543                 else {
 544                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 545                                 IEEE80211_DISCARD_MAC(vap,
 546                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 547                                     NULL, "too short (2): len %u",
 548                                     m->m_pkthdr.len);
 549                                 vap->iv_stats.is_rx_tooshort++;
 550                                 goto out;
 551                         }
 552                         bssid = wh->i_addr3;
 553                 }
 554                 /*
 555                  * Validate the bssid.
 556                  */
 557                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 558                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 559                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 560                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 561                         /* not interested in */
 562                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 563                             bssid, NULL, "%s", "not to bss");
 564                         vap->iv_stats.is_rx_wrongbss++;
 565                         goto out;
 566                 }
 567
 568                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 569                 ni->ni_noise = nf;
 570                 if (HAS_SEQ(type)) {
 571                         uint8_t tid = ieee80211_gettid(wh);
 572                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 573                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 574                                 ic->ic_wme.wme_hipri_traffic++;
 575                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 576                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 577                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 578                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 579                                 /* duplicate, discard */
 580                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 581                                     bssid, "duplicate",
 582                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 583                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 584                                     ni->ni_rxseqs[tid] >>
 585                                         IEEE80211_SEQ_SEQ_SHIFT,
 586                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 587                                     ni->ni_rxseqs[tid] &
 588                                         IEEE80211_SEQ_FRAG_MASK,
 589                                     tid);
 590                                 vap->iv_stats.is_rx_dup++;
 591                                 IEEE80211_NODE_STAT(ni, rx_dup);
 592                                 goto out;
 593                         }
 594                         ni->ni_rxseqs[tid] = rxseq;
 595                 }
 596         }
 597
 598         switch (type) {
 599         case IEEE80211_FC0_TYPE_DATA:
 600                 hdrspace = ieee80211_hdrspace(ic, wh);
 601                 if (m->m_len < hdrspace &&
 602                     (m = m_pullup(m, hdrspace)) == NULL) {
 603                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 604                             ni->ni_macaddr, NULL,
 605                             "data too short: expecting %u", hdrspace);
 606                         vap->iv_stats.is_rx_tooshort++;
 607                         goto out;               /* XXX */
 608                 }
 609                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 610                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 611                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 612                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 613                                 IEEE80211_DISCARD(vap,
 614                                     IEEE80211_MSG_INPUT, wh, "data",
 615                                     "incorrect dir 0x%x", dir);
 616                         } else {
 617                                 IEEE80211_DISCARD(vap,
 618                                     IEEE80211_MSG_INPUT |
 619                                     IEEE80211_MSG_WDS, wh,
 620                                     "4-address data",
 621                                     "%s", "DWDS not enabled");
 622                         }
 623                         vap->iv_stats.is_rx_wrongdir++;
 624                         goto out;
 625                 }
 626                 /* check if source STA is associated */
 627                 if (ni == vap->iv_bss) {
 628                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 629                             wh, "data", "%s", "unknown src");
 630                         ieee80211_send_error(ni, wh->i_addr2,
 631                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 632                             IEEE80211_REASON_NOT_AUTHED);
 633                         vap->iv_stats.is_rx_notassoc++;
 634                         goto err;
 635                 }
 636                 if (ni->ni_associd == 0) {
 637                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 638                             wh, "data", "%s", "unassoc src");
 639                         IEEE80211_SEND_MGMT(ni,
 640                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 641                             IEEE80211_REASON_NOT_ASSOCED);
 642                         vap->iv_stats.is_rx_notassoc++;
 643                         goto err;
 644                 }
 645
 646                 /*
 647                  * Check for power save state change.
 648                  * XXX out-of-order A-MPDU frames?
 649                  */
 650                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 651                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 652                         ieee80211_node_pwrsave(ni,
 653                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 654                 /*
 655                  * For 4-address packets handle WDS discovery
 656                  * notifications.  Once a WDS link is setup frames
 657                  * are just delivered to the WDS vap (see below).
 658                  */
 659                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 660                         if (!ieee80211_node_is_authorized(ni)) {
 661                                 IEEE80211_DISCARD(vap,
 662                                     IEEE80211_MSG_INPUT |
 663                                     IEEE80211_MSG_WDS, wh,
 664                                     "4-address data",
 665                                     "%s", "unauthorized port");
 666                                 vap->iv_stats.is_rx_unauth++;
 667                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 668                                 goto err;
 669                         }
 670                         ieee80211_dwds_discover(ni, m);
 671                         return type;
 672                 }
 673
 674                 /*
 675                  * Handle A-MPDU re-ordering.  If the frame is to be
 676                  * processed directly then ieee80211_ampdu_reorder
 677                  * will return 0; otherwise it has consumed the mbuf
 678                  * and we should do nothing more with it.
 679                  */
 680                 if ((m->m_flags & M_AMPDU) &&
 681                     ieee80211_ampdu_reorder(ni, m) != 0) {
 682                         m = NULL;
 683                         goto out;
 684                 }
 685         resubmit_ampdu:
 686
 687                 /*
 688                  * Handle privacy requirements.  Note that we
 689                  * must not be preempted from here until after
 690                  * we (potentially) call ieee80211_crypto_demic;
 691                  * otherwise we may violate assumptions in the
 692                  * crypto cipher modules used to do delayed update
 693                  * of replay sequence numbers.
 694                  */
 695                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 696                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 697                                 /*
 698                                  * Discard encrypted frames when privacy is off.
 699                                  */
 700                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 701                                     wh, "WEP", "%s", "PRIVACY off");
 702                                 vap->iv_stats.is_rx_noprivacy++;
 703                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 704                                 goto out;
 705                         }
 706                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 707                         if (key == NULL) {
 708                                 /* NB: stats+msgs handled in crypto_decap */
 709                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 710                                 goto out;
 711                         }
 712                         wh = mtod(m, struct ieee80211_frame *);
 713                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 714                 } else {
 715                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 716                         key = NULL;
 717                 }
 718
 719                 /*
 720                  * Save QoS bits for use below--before we strip the header.
 721                  */
 722                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 723                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 724                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 725                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 726                 } else
 727                         qos = 0;
 728
 729                 /*
 730                  * Next up, any fragmentation.
 731                  */
 732                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 733                         m = ieee80211_defrag(ni, m, hdrspace);
 734                         if (m == NULL) {
 735                                 /* Fragment dropped or frame not complete yet */
 736                                 goto out;
 737                         }
 738                 }
 739                 wh = NULL;              /* no longer valid, catch any uses */
 740
 741                 /*
 742                  * Next strip any MSDU crypto bits.
 743                  */
 744                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 745                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 746                             ni->ni_macaddr, "data", "%s", "demic error");
 747                         vap->iv_stats.is_rx_demicfail++;
 748                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 749                         goto out;
 750                 }
 751                 /* copy to listener after decrypt */
 752                 if (ieee80211_radiotap_active_vap(vap))
 753                         ieee80211_radiotap_rx(vap, m);
 754                 need_tap = 0;
 755                 /*
 756                  * Finally, strip the 802.11 header.
 757                  */
 758                 m = ieee80211_decap(vap, m, hdrspace);
 759                 if (m == NULL) {
 760                         /* XXX mask bit to check for both */
 761                         /* don't count Null data frames as errors */
 762                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 763                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 764                                 goto out;
 765                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 766                             ni->ni_macaddr, "data", "%s", "decap error");
 767                         vap->iv_stats.is_rx_decap++;
 768                         IEEE80211_NODE_STAT(ni, rx_decap);
 769                         goto err;
 770                 }
 771                 eh = mtod(m, struct ether_header *);
 772                 if (!ieee80211_node_is_authorized(ni)) {
 773                         /*
 774                          * Deny any non-PAE frames received prior to
 775                          * authorization.  For open/shared-key
 776                          * authentication the port is mark authorized
 777                          * after authentication completes.  For 802.1x
 778                          * the port is not marked authorized by the
 779                          * authenticator until the handshake has completed.
 780                          */
 781                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 782                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 783                                     eh->ether_shost, "data",
 784                                     "unauthorized port: ether type 0x%x len %u",
 785                                     eh->ether_type, m->m_pkthdr.len);
 786                                 vap->iv_stats.is_rx_unauth++;
 787                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 788                                 goto err;
 789                         }
 790                 } else {
 791                         /*
 792                          * When denying unencrypted frames, discard
 793                          * any non-PAE frames received without encryption.
 794                          */
 795                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 796                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 797                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 798                                 /*
 799                                  * Drop unencrypted frames.
 800                                  */
 801                                 vap->iv_stats.is_rx_unencrypted++;
 802                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 803                                 goto out;
 804                         }
 805                 }
 806                 /* XXX require HT? */
 807                 if (qos & IEEE80211_QOS_AMSDU) {
 808                         m = ieee80211_decap_amsdu(ni, m);
 809                         if (m == NULL)
 810                                 return IEEE80211_FC0_TYPE_DATA;
 811                 } else {
 812 #ifdef IEEE80211_SUPPORT_SUPERG
 813                         m = ieee80211_decap_fastframe(vap, ni, m);
 814                         if (m == NULL)
 815                                 return IEEE80211_FC0_TYPE_DATA;
 816 #endif
 817                 }
 818                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 819                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 820                 else
 821                         hostap_deliver_data(vap, ni, m);
 822                 return IEEE80211_FC0_TYPE_DATA;
 823
 824         case IEEE80211_FC0_TYPE_MGT:
 825                 vap->iv_stats.is_rx_mgmt++;
 826                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 827                 if (dir != IEEE80211_FC1_DIR_NODS) {
 828                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 829                             wh, "mgt", "incorrect dir 0x%x", dir);
 830                         vap->iv_stats.is_rx_wrongdir++;
 831                         goto err;
 832                 }
 833                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 834                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 835                             ni->ni_macaddr, "mgt", "too short: len %u",
 836                             m->m_pkthdr.len);
 837                         vap->iv_stats.is_rx_tooshort++;
 838                         goto out;
 839                 }
 840                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 841                         /* ensure return frames are unicast */
 842                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 843                             wh, NULL, "source is multicast: %s",
 844                             ether_sprintf(wh->i_addr2));
 845                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 846                         goto out;
 847                 }
 848 #ifdef IEEE80211_DEBUG
 849                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 850                     ieee80211_msg_dumppkts(vap)) {
 851                         if_printf(ifp, "received %s from %s rssi %d\n",
 852                             ieee80211_mgt_subtype_name[subtype >>
 853                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 854                             ether_sprintf(wh->i_addr2), rssi);
 855                 }
 856 #endif
 857                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 858                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 859                                 /*
 860                                  * Only shared key auth frames with a challenge
 861                                  * should be encrypted, discard all others.
 862                                  */
 863                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 864                                     wh, NULL,
 865                                     "%s", "WEP set but not permitted");
 866                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 867                                 goto out;
 868                         }
 869                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 870                                 /*
 871                                  * Discard encrypted frames when privacy is off.
 872                                  */
 873                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 874                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 875                                 vap->iv_stats.is_rx_noprivacy++;
 876                                 goto out;
 877                         }
 878                         hdrspace = ieee80211_hdrspace(ic, wh);
 879                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 880                         if (key == NULL) {
 881                                 /* NB: stats+msgs handled in crypto_decap */
 882                                 goto out;
 883                         }
 884                         wh = mtod(m, struct ieee80211_frame *);
 885                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 886                 }
 887                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 888                 goto out;
 889
 890         case IEEE80211_FC0_TYPE_CTL:
 891                 vap->iv_stats.is_rx_ctl++;
 892                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 893                 vap->iv_recv_ctl(ni, m, subtype);
 894                 goto out;
 895         default:
 896                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 897                     wh, "bad", "frame type 0x%x", type);
 898                 /* should not come here */
 899                 break;
 900         }
 901 err:
 902         ifp->if_ierrors++;
 903 out:
 904         if (m != NULL) {
 905                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 906                         ieee80211_radiotap_rx(vap, m);
 907                 m_freem(m);
 908         }
 909         return type;
 910 #undef SEQ_LEQ
 911 }
 912
 913 static void
 914 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 915     int rssi, int nf, uint16_t seq, uint16_t status)
 916 {
 917         struct ieee80211vap *vap = ni->ni_vap;
 918
 919         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 920
 921         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 922                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 923                     ni->ni_macaddr, "open auth",
 924                     "bad sta auth mode %u", ni->ni_authmode);
 925                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 926                 /*
 927                  * Clear any challenge text that may be there if
 928                  * a previous shared key auth failed and then an
 929                  * open auth is attempted.
 930                  */
 931                 if (ni->ni_challenge != NULL) {
 932                         free(ni->ni_challenge, M_80211_NODE);
 933                         ni->ni_challenge = NULL;
 934                 }
 935                 /* XXX hack to workaround calling convention */
 936                 ieee80211_send_error(ni, wh->i_addr2,
 937                     IEEE80211_FC0_SUBTYPE_AUTH,
 938                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 939                 return;
 940         }
 941         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 942                 vap->iv_stats.is_rx_bad_auth++;
 943                 return;
 944         }
 945         /* always accept open authentication requests */
 946         if (ni == vap->iv_bss) {
 947                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 948                 if (ni == NULL)
 949                         return;
 950         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 951                 (void) ieee80211_ref_node(ni);
 952         /*
 953          * Mark the node as referenced to reflect that it's
 954          * reference count has been bumped to insure it remains
 955          * after the transaction completes.
 956          */
 957         ni->ni_flags |= IEEE80211_NODE_AREF;
 958         /*
 959          * Mark the node as requiring a valid association id
 960          * before outbound traffic is permitted.
 961          */
 962         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 963
 964         if (vap->iv_acl != NULL &&
 965             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 966                 /*
 967                  * When the ACL policy is set to RADIUS we defer the
 968                  * authorization to a user agent.  Dispatch an event,
 969                  * a subsequent MLME call will decide the fate of the
 970                  * station.  If the user agent is not present then the
 971                  * node will be reclaimed due to inactivity.
 972                  */
 973                 IEEE80211_NOTE_MAC(vap,
 974                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 975                     "%s", "station authentication defered (radius acl)");
 976                 ieee80211_notify_node_auth(ni);
 977         } else {
 978                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 979                 IEEE80211_NOTE_MAC(vap,
 980                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 981                     "%s", "station authenticated (open)");
 982                 /*
 983                  * When 802.1x is not in use mark the port
 984                  * authorized at this point so traffic can flow.
 985                  */
 986                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 987                         ieee80211_node_authorize(ni);
 988         }
 989 }
 990
 991 static void
 992 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 993     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 994     uint16_t seq, uint16_t status)
 995 {
 996         struct ieee80211vap *vap = ni->ni_vap;
 997         uint8_t *challenge;
 998         int allocbs, estatus;
 999
1000         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1001
1002         /*
1003          * NB: this can happen as we allow pre-shared key
1004          * authentication to be enabled w/o wep being turned
1005          * on so that configuration of these can be done
1006          * in any order.  It may be better to enforce the
1007          * ordering in which case this check would just be
1008          * for sanity/consistency.
1009          */
1010         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1011                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1012                     ni->ni_macaddr, "shared key auth",
1013                     "%s", " PRIVACY is disabled");
1014                 estatus = IEEE80211_STATUS_ALG;
1015                 goto bad;
1016         }
1017         /*
1018          * Pre-shared key authentication is evil; accept
1019          * it only if explicitly configured (it is supported
1020          * mainly for compatibility with clients like Mac OS X).
1021          */
1022         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1023             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1024                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1025                     ni->ni_macaddr, "shared key auth",
1026                     "bad sta auth mode %u", ni->ni_authmode);
1027                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1028                 estatus = IEEE80211_STATUS_ALG;
1029                 goto bad;
1030         }
1031
1032         challenge = NULL;
1033         if (frm + 1 < efrm) {
1034                 if ((frm[1] + 2) > (efrm - frm)) {
1035                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1036                             ni->ni_macaddr, "shared key auth",
1037                             "ie %d/%d too long",
1038                             frm[0], (frm[1] + 2) - (efrm - frm));
1039                         vap->iv_stats.is_rx_bad_auth++;
1040                         estatus = IEEE80211_STATUS_CHALLENGE;
1041                         goto bad;
1042                 }
1043                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1044                         challenge = frm;
1045                 frm += frm[1] + 2;
1046         }
1047         switch (seq) {
1048         case IEEE80211_AUTH_SHARED_CHALLENGE:
1049         case IEEE80211_AUTH_SHARED_RESPONSE:
1050                 if (challenge == NULL) {
1051                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1052                             ni->ni_macaddr, "shared key auth",
1053                             "%s", "no challenge");
1054                         vap->iv_stats.is_rx_bad_auth++;
1055                         estatus = IEEE80211_STATUS_CHALLENGE;
1056                         goto bad;
1057                 }
1058                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1059                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1060                             ni->ni_macaddr, "shared key auth",
1061                             "bad challenge len %d", challenge[1]);
1062                         vap->iv_stats.is_rx_bad_auth++;
1063                         estatus = IEEE80211_STATUS_CHALLENGE;
1064                         goto bad;
1065                 }
1066         default:
1067                 break;
1068         }
1069         switch (seq) {
1070         case IEEE80211_AUTH_SHARED_REQUEST:
1071                 if (ni == vap->iv_bss) {
1072                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1073                         if (ni == NULL) {
1074                                 /* NB: no way to return an error */
1075                                 return;
1076                         }
1077                         allocbs = 1;
1078                 } else {
1079                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1080                                 (void) ieee80211_ref_node(ni);
1081                         allocbs = 0;
1082                 }
1083                 /*
1084                  * Mark the node as referenced to reflect that it's
1085                  * reference count has been bumped to insure it remains
1086                  * after the transaction completes.
1087                  */
1088                 ni->ni_flags |= IEEE80211_NODE_AREF;
1089                 /*
1090                  * Mark the node as requiring a valid associatio id
1091                  * before outbound traffic is permitted.
1092                  */
1093                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1094                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1095                 ni->ni_noise = nf;
1096                 if (!ieee80211_alloc_challenge(ni)) {
1097                         /* NB: don't return error so they rexmit */
1098                         return;
1099                 }
1100                 get_random_bytes(ni->ni_challenge,
1101                         IEEE80211_CHALLENGE_LEN);
1102                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1103                     ni, "shared key %sauth request", allocbs ? "" : "re");
1104                 /*
1105                  * When the ACL policy is set to RADIUS we defer the
1106                  * authorization to a user agent.  Dispatch an event,
1107                  * a subsequent MLME call will decide the fate of the
1108                  * station.  If the user agent is not present then the
1109                  * node will be reclaimed due to inactivity.
1110                  */
1111                 if (vap->iv_acl != NULL &&
1112                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1113                         IEEE80211_NOTE_MAC(vap,
1114                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1115                             ni->ni_macaddr,
1116                             "%s", "station authentication defered (radius acl)");
1117                         ieee80211_notify_node_auth(ni);
1118                         return;
1119                 }
1120                 break;
1121         case IEEE80211_AUTH_SHARED_RESPONSE:
1122                 if (ni == vap->iv_bss) {
1123                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1124                             ni->ni_macaddr, "shared key response",
1125                             "%s", "unknown station");
1126                         /* NB: don't send a response */
1127                         return;
1128                 }
1129                 if (ni->ni_challenge == NULL) {
1130                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1131                             ni->ni_macaddr, "shared key response",
1132                             "%s", "no challenge recorded");
1133                         vap->iv_stats.is_rx_bad_auth++;
1134                         estatus = IEEE80211_STATUS_CHALLENGE;
1135                         goto bad;
1136                 }
1137                 if (memcmp(ni->ni_challenge, &challenge[2],
1138                            challenge[1]) != 0) {
1139                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1140                             ni->ni_macaddr, "shared key response",
1141                             "%s", "challenge mismatch");
1142                         vap->iv_stats.is_rx_auth_fail++;
1143                         estatus = IEEE80211_STATUS_CHALLENGE;
1144                         goto bad;
1145                 }
1146                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1147                     ni, "%s", "station authenticated (shared key)");
1148                 ieee80211_node_authorize(ni);
1149                 break;
1150         default:
1151                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1152                     ni->ni_macaddr, "shared key auth",
1153                     "bad seq %d", seq);
1154                 vap->iv_stats.is_rx_bad_auth++;
1155                 estatus = IEEE80211_STATUS_SEQUENCE;
1156                 goto bad;
1157         }
1158         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1159         return;
1160 bad:
1161         /*
1162          * Send an error response; but only when operating as an AP.
1163          */
1164         /* XXX hack to workaround calling convention */
1165         ieee80211_send_error(ni, wh->i_addr2,
1166             IEEE80211_FC0_SUBTYPE_AUTH,
1167             (seq + 1) | (estatus<<16));
1168 }
1169
1170 /*
1171  * Convert a WPA cipher selector OUI to an internal
1172  * cipher algorithm.  Where appropriate we also
1173  * record any key length.
1174  */
1175 static int
1176 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1177 {
1178 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1179         uint32_t w = LE_READ_4(sel);
1180
1181         switch (w) {
1182         case WPA_SEL(WPA_CSE_NULL):
1183                 return IEEE80211_CIPHER_NONE;
1184         case WPA_SEL(WPA_CSE_WEP40):
1185                 if (keylen)
1186                         *keylen = 40 / NBBY;
1187                 return IEEE80211_CIPHER_WEP;
1188         case WPA_SEL(WPA_CSE_WEP104):
1189                 if (keylen)
1190                         *keylen = 104 / NBBY;
1191                 return IEEE80211_CIPHER_WEP;
1192         case WPA_SEL(WPA_CSE_TKIP):
1193                 return IEEE80211_CIPHER_TKIP;
1194         case WPA_SEL(WPA_CSE_CCMP):
1195                 return IEEE80211_CIPHER_AES_CCM;
1196         }
1197         return 32;              /* NB: so 1<< is discarded */
1198 #undef WPA_SEL
1199 }
1200
1201 /*
1202  * Convert a WPA key management/authentication algorithm
1203  * to an internal code.
1204  */
1205 static int
1206 wpa_keymgmt(const uint8_t *sel)
1207 {
1208 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1209         uint32_t w = LE_READ_4(sel);
1210
1211         switch (w) {
1212         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1213                 return WPA_ASE_8021X_UNSPEC;
1214         case WPA_SEL(WPA_ASE_8021X_PSK):
1215                 return WPA_ASE_8021X_PSK;
1216         case WPA_SEL(WPA_ASE_NONE):
1217                 return WPA_ASE_NONE;
1218         }
1219         return 0;               /* NB: so is discarded */
1220 #undef WPA_SEL
1221 }
1222
1223 /*
1224  * Parse a WPA information element to collect parameters.
1225  * Note that we do not validate security parameters; that
1226  * is handled by the authenticator; the parsing done here
1227  * is just for internal use in making operational decisions.
1228  */
1229 static int
1230 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1231         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1232 {
1233         uint8_t len = frm[1];
1234         uint32_t w;
1235         int n;
1236
1237         /*
1238          * Check the length once for fixed parts: OUI, type,
1239          * version, mcast cipher, and 2 selector counts.
1240          * Other, variable-length data, must be checked separately.
1241          */
1242         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1243                 IEEE80211_DISCARD_IE(vap,
1244                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1245                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1246                 return IEEE80211_REASON_IE_INVALID;
1247         }
1248         if (len < 14) {
1249                 IEEE80211_DISCARD_IE(vap,
1250                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1251                     wh, "WPA", "too short, len %u", len);
1252                 return IEEE80211_REASON_IE_INVALID;
1253         }
1254         frm += 6, len -= 4;             /* NB: len is payload only */
1255         /* NB: iswapoui already validated the OUI and type */
1256         w = LE_READ_2(frm);
1257         if (w != WPA_VERSION) {
1258                 IEEE80211_DISCARD_IE(vap,
1259                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1260                     wh, "WPA", "bad version %u", w);
1261                 return IEEE80211_REASON_IE_INVALID;
1262         }
1263         frm += 2, len -= 2;
1264
1265         memset(rsn, 0, sizeof(*rsn));
1266
1267         /* multicast/group cipher */
1268         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1269         frm += 4, len -= 4;
1270
1271         /* unicast ciphers */
1272         n = LE_READ_2(frm);
1273         frm += 2, len -= 2;
1274         if (len < n*4+2) {
1275                 IEEE80211_DISCARD_IE(vap,
1276                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1277                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1278                     len, n);
1279                 return IEEE80211_REASON_IE_INVALID;
1280         }
1281         w = 0;
1282         for (; n > 0; n--) {
1283                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1284                 frm += 4, len -= 4;
1285         }
1286         if (w & (1<<IEEE80211_CIPHER_TKIP))
1287                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1288         else
1289                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1290
1291         /* key management algorithms */
1292         n = LE_READ_2(frm);
1293         frm += 2, len -= 2;
1294         if (len < n*4) {
1295                 IEEE80211_DISCARD_IE(vap,
1296                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1297                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1298                     len, n);
1299                 return IEEE80211_REASON_IE_INVALID;
1300         }
1301         w = 0;
1302         for (; n > 0; n--) {
1303                 w |= wpa_keymgmt(frm);
1304                 frm += 4, len -= 4;
1305         }
1306         if (w & WPA_ASE_8021X_UNSPEC)
1307                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1308         else
1309                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1310
1311         if (len > 2)            /* optional capabilities */
1312                 rsn->rsn_caps = LE_READ_2(frm);
1313
1314         return 0;
1315 }
1316
1317 /*
1318  * Convert an RSN cipher selector OUI to an internal
1319  * cipher algorithm.  Where appropriate we also
1320  * record any key length.
1321  */
1322 static int
1323 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1324 {
1325 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1326         uint32_t w = LE_READ_4(sel);
1327
1328         switch (w) {
1329         case RSN_SEL(RSN_CSE_NULL):
1330                 return IEEE80211_CIPHER_NONE;
1331         case RSN_SEL(RSN_CSE_WEP40):
1332                 if (keylen)
1333                         *keylen = 40 / NBBY;
1334                 return IEEE80211_CIPHER_WEP;
1335         case RSN_SEL(RSN_CSE_WEP104):
1336                 if (keylen)
1337                         *keylen = 104 / NBBY;
1338                 return IEEE80211_CIPHER_WEP;
1339         case RSN_SEL(RSN_CSE_TKIP):
1340                 return IEEE80211_CIPHER_TKIP;
1341         case RSN_SEL(RSN_CSE_CCMP):
1342                 return IEEE80211_CIPHER_AES_CCM;
1343         case RSN_SEL(RSN_CSE_WRAP):
1344                 return IEEE80211_CIPHER_AES_OCB;
1345         }
1346         return 32;              /* NB: so 1<< is discarded */
1347 #undef WPA_SEL
1348 }
1349
1350 /*
1351  * Convert an RSN key management/authentication algorithm
1352  * to an internal code.
1353  */
1354 static int
1355 rsn_keymgmt(const uint8_t *sel)
1356 {
1357 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1358         uint32_t w = LE_READ_4(sel);
1359
1360         switch (w) {
1361         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1362                 return RSN_ASE_8021X_UNSPEC;
1363         case RSN_SEL(RSN_ASE_8021X_PSK):
1364                 return RSN_ASE_8021X_PSK;
1365         case RSN_SEL(RSN_ASE_NONE):
1366                 return RSN_ASE_NONE;
1367         }
1368         return 0;               /* NB: so is discarded */
1369 #undef RSN_SEL
1370 }
1371
1372 /*
1373  * Parse a WPA/RSN information element to collect parameters
1374  * and validate the parameters against what has been
1375  * configured for the system.
1376  */
1377 static int
1378 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1379         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1380 {
1381         uint8_t len = frm[1];
1382         uint32_t w;
1383         int n;
1384
1385         /*
1386          * Check the length once for fixed parts:
1387          * version, mcast cipher, and 2 selector counts.
1388          * Other, variable-length data, must be checked separately.
1389          */
1390         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1391                 IEEE80211_DISCARD_IE(vap,
1392                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1393                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1394                 return IEEE80211_REASON_IE_INVALID;
1395         }
1396         if (len < 10) {
1397                 IEEE80211_DISCARD_IE(vap,
1398                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1399                     wh, "RSN", "too short, len %u", len);
1400                 return IEEE80211_REASON_IE_INVALID;
1401         }
1402         frm += 2;
1403         w = LE_READ_2(frm);
1404         if (w != RSN_VERSION) {
1405                 IEEE80211_DISCARD_IE(vap,
1406                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1407                     wh, "RSN", "bad version %u", w);
1408                 return IEEE80211_REASON_IE_INVALID;
1409         }
1410         frm += 2, len -= 2;
1411
1412         memset(rsn, 0, sizeof(*rsn));
1413
1414         /* multicast/group cipher */
1415         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1416         frm += 4, len -= 4;
1417
1418         /* unicast ciphers */
1419         n = LE_READ_2(frm);
1420         frm += 2, len -= 2;
1421         if (len < n*4+2) {
1422                 IEEE80211_DISCARD_IE(vap,
1423                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1424                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1425                     len, n);
1426                 return IEEE80211_REASON_IE_INVALID;
1427         }
1428         w = 0;
1429         for (; n > 0; n--) {
1430                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1431                 frm += 4, len -= 4;
1432         }
1433         if (w & (1<<IEEE80211_CIPHER_TKIP))
1434                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1435         else
1436                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1437
1438         /* key management algorithms */
1439         n = LE_READ_2(frm);
1440         frm += 2, len -= 2;
1441         if (len < n*4) {
1442                 IEEE80211_DISCARD_IE(vap,
1443                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1444                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1445                     len, n);
1446                 return IEEE80211_REASON_IE_INVALID;
1447         }
1448         w = 0;
1449         for (; n > 0; n--) {
1450                 w |= rsn_keymgmt(frm);
1451                 frm += 4, len -= 4;
1452         }
1453         if (w & RSN_ASE_8021X_UNSPEC)
1454                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1455         else
1456                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1457
1458         /* optional RSN capabilities */
1459         if (len > 2)
1460                 rsn->rsn_caps = LE_READ_2(frm);
1461         /* XXXPMKID */
1462
1463         return 0;
1464 }
1465
1466 /*
1467  * WPA/802.11i assocation request processing.
1468  */
1469 static int
1470 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1471         const struct ieee80211_frame *wh, const uint8_t *wpa,
1472         const uint8_t *rsn, uint16_t capinfo)
1473 {
1474         struct ieee80211vap *vap = ni->ni_vap;
1475         uint8_t reason;
1476         int badwparsn;
1477
1478         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1479         if (wpa == NULL && rsn == NULL) {
1480                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1481                         /*
1482                          * W-Fi Protected Setup (WPS) permits
1483                          * clients to associate and pass EAPOL frames
1484                          * to establish initial credentials.
1485                          */
1486                         ni->ni_flags |= IEEE80211_NODE_WPS;
1487                         return 1;
1488                 }
1489                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1490                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1491                         /*
1492                          * Transitional Security Network.  Permits clients
1493                          * to associate and use WEP while WPA is configured.
1494                          */
1495                         ni->ni_flags |= IEEE80211_NODE_TSN;
1496                         return 1;
1497                 }
1498                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1499                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1500                 vap->iv_stats.is_rx_assoc_badwpaie++;
1501                 reason = IEEE80211_REASON_IE_INVALID;
1502                 goto bad;
1503         }
1504         /* assert right association security credentials */
1505         badwparsn = 0;                  /* NB: to silence compiler */
1506         switch (vap->iv_flags & IEEE80211_F_WPA) {
1507         case IEEE80211_F_WPA1:
1508                 badwparsn = (wpa == NULL);
1509                 break;
1510         case IEEE80211_F_WPA2:
1511                 badwparsn = (rsn == NULL);
1512                 break;
1513         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1514                 badwparsn = (wpa == NULL && rsn == NULL);
1515                 break;
1516         }
1517         if (badwparsn) {
1518                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1519                     wh, NULL,
1520                     "%s", "missing WPA/RSN IE in association request");
1521                 vap->iv_stats.is_rx_assoc_badwpaie++;
1522                 reason = IEEE80211_REASON_IE_INVALID;
1523                 goto bad;
1524         }
1525         /*
1526          * Parse WPA/RSN information element.
1527          */
1528         if (wpa != NULL)
1529                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1530         else
1531                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1532         if (reason != 0) {
1533                 /* XXX distinguish WPA/RSN? */
1534                 vap->iv_stats.is_rx_assoc_badwpaie++;
1535                 goto bad;
1536         }
1537         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1538             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1539             wpa != NULL ? "WPA" : "RSN",
1540             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1541             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1542             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1543
1544         return 1;
1545 bad:
1546         ieee80211_node_deauth(ni, reason);
1547         return 0;
1548 }
1549
1550 /* XXX find a better place for definition */
1551 struct l2_update_frame {
1552         struct ether_header eh;
1553         uint8_t dsap;
1554         uint8_t ssap;
1555         uint8_t control;
1556         uint8_t xid[3];
1557 }  __packed;
1558
1559 /*
1560  * Deliver a TGf L2UF frame on behalf of a station.
1561  * This primes any bridge when the station is roaming
1562  * between ap's on the same wired network.
1563  */
1564 static void
1565 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1566 {
1567         struct ieee80211vap *vap = ni->ni_vap;
1568         struct ifnet *ifp = vap->iv_ifp;
1569         struct mbuf *m;
1570         struct l2_update_frame *l2uf;
1571         struct ether_header *eh;
1572
1573         m = m_gethdr(M_NOWAIT, MT_DATA);
1574         if (m == NULL) {
1575                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1576                     "%s", "no mbuf for l2uf frame");
1577                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1578                 return;
1579         }
1580         l2uf = mtod(m, struct l2_update_frame *);
1581         eh = &l2uf->eh;
1582         /* dst: Broadcast address */
1583         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1584         /* src: associated STA */
1585         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1586         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1587
1588         l2uf->dsap = 0;
1589         l2uf->ssap = 0;
1590         l2uf->control = 0xf5;
1591         l2uf->xid[0] = 0x81;
1592         l2uf->xid[1] = 0x80;
1593         l2uf->xid[2] = 0x00;
1594
1595         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1596         hostap_deliver_data(vap, ni, m);
1597 }
1598
1599 static void
1600 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1601         int reassoc, int resp, const char *tag, int rate)
1602 {
1603         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1604             "deny %s request, %s rate set mismatch, rate/MCS %d",
1605             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1606         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1607         ieee80211_node_leave(ni);
1608 }
1609
1610 static void
1611 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1612         int reassoc, int resp, const char *tag, int capinfo)
1613 {
1614         struct ieee80211vap *vap = ni->ni_vap;
1615
1616         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1617             "deny %s request, %s mismatch 0x%x",
1618             reassoc ? "reassoc" : "assoc", tag, capinfo);
1619         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1620         ieee80211_node_leave(ni);
1621         vap->iv_stats.is_rx_assoc_capmismatch++;
1622 }
1623
1624 static void
1625 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1626         int reassoc, int resp)
1627 {
1628         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1629             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1630         /* XXX no better code */
1631         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1632         ieee80211_node_leave(ni);
1633 }
1634
1635 static void
1636 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1637         int algo, int seq, int status)
1638 {
1639         struct ieee80211vap *vap = ni->ni_vap;
1640
1641         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1642             wh, NULL, "unsupported alg %d", algo);
1643         vap->iv_stats.is_rx_auth_unsupported++;
1644         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1645             seq | (status << 16));
1646 }
1647
1648 static __inline int
1649 ishtmixed(const uint8_t *ie)
1650 {
1651         const struct ieee80211_ie_htinfo *ht =
1652             (const struct ieee80211_ie_htinfo *) ie;
1653         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1654             IEEE80211_HTINFO_OPMODE_MIXED;
1655 }
1656
1657 static int
1658 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1659 {
1660         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1661         int i;
1662
1663         /* NB: the 11b clients we care about will not have xrates */
1664         if (xrates != NULL || rates == NULL)
1665                 return 0;
1666         for (i = 0; i < rates[1]; i++) {
1667                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1668                 if (r > 2*11 || ((1<<r) & brates) == 0)
1669                         return 0;
1670         }
1671         return 1;
1672 }
1673
1674 static void
1675 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1676         int subtype, int rssi, int nf)
1677 {
1678         struct ieee80211vap *vap = ni->ni_vap;
1679         struct ieee80211com *ic = ni->ni_ic;
1680         struct ieee80211_frame *wh;
1681         uint8_t *frm, *efrm, *sfrm;
1682         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1683         int reassoc, resp;
1684         uint8_t rate;
1685
1686         wh = mtod(m0, struct ieee80211_frame *);
1687         frm = (uint8_t *)&wh[1];
1688         efrm = mtod(m0, uint8_t *) + m0->m_len;
1689         switch (subtype) {
1690         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1691         case IEEE80211_FC0_SUBTYPE_BEACON: {
1692                 struct ieee80211_scanparams scan;
1693                 /*
1694                  * We process beacon/probe response frames when scanning;
1695                  * otherwise we check beacon frames for overlapping non-ERP
1696                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1697                  */
1698                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1699                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1700                         vap->iv_stats.is_rx_mgtdiscard++;
1701                         return;
1702                 }
1703                 /* NB: accept off-channel frames */
1704                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1705                         return;
1706                 /*
1707                  * Count frame now that we know it's to be processed.
1708                  */
1709                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1710                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1711                         IEEE80211_NODE_STAT(ni, rx_beacons);
1712                 } else
1713                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1714                 /*
1715                  * If scanning, just pass information to the scan module.
1716                  */
1717                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1718                         if (scan.status == 0 &&         /* NB: on channel */
1719                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1720                                 /*
1721                                  * Actively scanning a channel marked passive;
1722                                  * send a probe request now that we know there
1723                                  * is 802.11 traffic present.
1724                                  *
1725                                  * XXX check if the beacon we recv'd gives
1726                                  * us what we need and suppress the probe req
1727                                  */
1728                                 ieee80211_probe_curchan(vap, 1);
1729                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1730                         }
1731                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1732                         return;
1733                 }
1734                 /*
1735                  * Check beacon for overlapping bss w/ non ERP stations.
1736                  * If we detect one and protection is configured but not
1737                  * enabled, enable it and start a timer that'll bring us
1738                  * out if we stop seeing the bss.
1739                  */
1740                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1741                     scan.status == 0 &&                 /* NB: on-channel */
1742                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1743                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1744                         ic->ic_lastnonerp = ticks;
1745                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1746                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1747                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1748                                 IEEE80211_NOTE_FRAME(vap,
1749                                     IEEE80211_MSG_ASSOC, wh,
1750                                     "non-ERP present on channel %d "
1751                                     "(saw erp 0x%x from channel %d), "
1752                                     "enable use of protection",
1753                                     ic->ic_curchan->ic_ieee,
1754                                     scan.erp, scan.chan);
1755                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1756                                 ieee80211_notify_erp(ic);
1757                         }
1758                 }
1759                 /*
1760                  * Check beacon for non-HT station on HT channel
1761                  * and update HT BSS occupancy as appropriate.
1762                  */
1763                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1764                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1765                                 /*
1766                                  * Off control channel; only check frames
1767                                  * that come in the extension channel when
1768                                  * operating w/ HT40.
1769                                  */
1770                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1771                                         break;
1772                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1773                                         break;
1774                         }
1775                         if (scan.htinfo == NULL) {
1776                                 ieee80211_htprot_update(ic,
1777                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1778                                     IEEE80211_HTINFO_NONHT_PRESENT);
1779                         } else if (ishtmixed(scan.htinfo)) {
1780                                 /* XXX? take NONHT_PRESENT from beacon? */
1781                                 ieee80211_htprot_update(ic,
1782                                     IEEE80211_HTINFO_OPMODE_MIXED |
1783                                     IEEE80211_HTINFO_NONHT_PRESENT);
1784                         }
1785                 }
1786                 break;
1787         }
1788
1789         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1790                 if (vap->iv_state != IEEE80211_S_RUN) {
1791                         vap->iv_stats.is_rx_mgtdiscard++;
1792                         return;
1793                 }
1794                 /*
1795                  * prreq frame format
1796                  *      [tlv] ssid
1797                  *      [tlv] supported rates
1798                  *      [tlv] extended supported rates
1799                  */
1800                 ssid = rates = xrates = NULL;
1801                 sfrm = frm;
1802                 while (efrm - frm > 1) {
1803                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1804                         switch (*frm) {
1805                         case IEEE80211_ELEMID_SSID:
1806                                 ssid = frm;
1807                                 break;
1808                         case IEEE80211_ELEMID_RATES:
1809                                 rates = frm;
1810                                 break;
1811                         case IEEE80211_ELEMID_XRATES:
1812                                 xrates = frm;
1813                                 break;
1814                         }
1815                         frm += frm[1] + 2;
1816                 }
1817                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1818                 if (xrates != NULL)
1819                         IEEE80211_VERIFY_ELEMENT(xrates,
1820                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1821                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1822                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1823                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1824                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1825                             wh, NULL,
1826                             "%s", "no ssid with ssid suppression enabled");
1827                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1828                         return;
1829                 }
1830
1831                 /* XXX find a better class or define it's own */
1832                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1833                     "%s", "recv probe req");
1834                 /*
1835                  * Some legacy 11b clients cannot hack a complete
1836                  * probe response frame.  When the request includes
1837                  * only a bare-bones rate set, communicate this to
1838                  * the transmit side.
1839                  */
1840                 ieee80211_send_proberesp(vap, wh->i_addr2,
1841                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1842                 break;
1843
1844         case IEEE80211_FC0_SUBTYPE_AUTH: {
1845                 uint16_t algo, seq, status;
1846
1847                 if (vap->iv_state != IEEE80211_S_RUN) {
1848                         vap->iv_stats.is_rx_mgtdiscard++;
1849                         return;
1850                 }
1851                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1852                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1853                             wh, NULL, "%s", "wrong bssid");
1854                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1855                         return;
1856                 }
1857                 /*
1858                  * auth frame format
1859                  *      [2] algorithm
1860                  *      [2] sequence
1861                  *      [2] status
1862                  *      [tlv*] challenge
1863                  */
1864                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1865                 algo   = le16toh(*(uint16_t *)frm);
1866                 seq    = le16toh(*(uint16_t *)(frm + 2));
1867                 status = le16toh(*(uint16_t *)(frm + 4));
1868                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1869                     "recv auth frame with algorithm %d seq %d", algo, seq);
1870                 /*
1871                  * Consult the ACL policy module if setup.
1872                  */
1873                 if (vap->iv_acl != NULL &&
1874                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1875                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1876                             wh, NULL, "%s", "disallowed by ACL");
1877                         vap->iv_stats.is_rx_acl++;
1878                         ieee80211_send_error(ni, wh->i_addr2,
1879                             IEEE80211_FC0_SUBTYPE_AUTH,
1880                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1881                         return;
1882                 }
1883                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1884                         IEEE80211_DISCARD(vap,
1885                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1886                             wh, NULL, "%s", "TKIP countermeasures enabled");
1887                         vap->iv_stats.is_rx_auth_countermeasures++;
1888                         ieee80211_send_error(ni, wh->i_addr2,
1889                                 IEEE80211_FC0_SUBTYPE_AUTH,
1890                                 IEEE80211_REASON_MIC_FAILURE);
1891                         return;
1892                 }
1893                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1894                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1895                             seq, status);
1896                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1897                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1898                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1899                         authalgreject(ni, wh, algo,
1900                             seq+1, IEEE80211_STATUS_ALG);
1901                         return;
1902                 } else {
1903                         /*
1904                          * We assume that an unknown algorithm is the result
1905                          * of a decryption failure on a shared key auth frame;
1906                          * return a status code appropriate for that instead
1907                          * of IEEE80211_STATUS_ALG.
1908                          *
1909                          * NB: a seq# of 4 is intentional; the decrypted
1910                          *     frame likely has a bogus seq value.
1911                          */
1912                         authalgreject(ni, wh, algo,
1913                             4, IEEE80211_STATUS_CHALLENGE);
1914                         return;
1915                 }
1916                 break;
1917         }
1918
1919         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1920         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1921                 uint16_t capinfo, lintval;
1922                 struct ieee80211_rsnparms rsnparms;
1923
1924                 if (vap->iv_state != IEEE80211_S_RUN) {
1925                         vap->iv_stats.is_rx_mgtdiscard++;
1926                         return;
1927                 }
1928                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1929                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1930                             wh, NULL, "%s", "wrong bssid");
1931                         vap->iv_stats.is_rx_assoc_bss++;
1932                         return;
1933                 }
1934                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1935                         reassoc = 1;
1936                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1937                 } else {
1938                         reassoc = 0;
1939                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1940                 }
1941                 if (ni == vap->iv_bss) {
1942                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1943                             "deny %s request, sta not authenticated",
1944                             reassoc ? "reassoc" : "assoc");
1945                         ieee80211_send_error(ni, wh->i_addr2,
1946                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1947                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1948                         vap->iv_stats.is_rx_assoc_notauth++;
1949                         return;
1950                 }
1951
1952                 /*
1953                  * asreq frame format
1954                  *      [2] capability information
1955                  *      [2] listen interval
1956                  *      [6*] current AP address (reassoc only)
1957                  *      [tlv] ssid
1958                  *      [tlv] supported rates
1959                  *      [tlv] extended supported rates
1960                  *      [tlv] WPA or RSN
1961                  *      [tlv] HT capabilities
1962                  *      [tlv] Atheros capabilities
1963                  */
1964                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1965                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1966                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1967                 if (reassoc)
1968                         frm += 6;       /* ignore current AP info */
1969                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1970                 sfrm = frm;
1971                 while (efrm - frm > 1) {
1972                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1973                         switch (*frm) {
1974                         case IEEE80211_ELEMID_SSID:
1975                                 ssid = frm;
1976                                 break;
1977                         case IEEE80211_ELEMID_RATES:
1978                                 rates = frm;
1979                                 break;
1980                         case IEEE80211_ELEMID_XRATES:
1981                                 xrates = frm;
1982                                 break;
1983                         case IEEE80211_ELEMID_RSN:
1984                                 rsn = frm;
1985                                 break;
1986                         case IEEE80211_ELEMID_HTCAP:
1987                                 htcap = frm;
1988                                 break;
1989                         case IEEE80211_ELEMID_VENDOR:
1990                                 if (iswpaoui(frm))
1991                                         wpa = frm;
1992                                 else if (iswmeinfo(frm))
1993                                         wme = frm;
1994 #ifdef IEEE80211_SUPPORT_SUPERG
1995                                 else if (isatherosoui(frm))
1996                                         ath = frm;
1997 #endif
1998                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
1999                                         if (ishtcapoui(frm) && htcap == NULL)
2000                                                 htcap = frm;
2001                                 }
2002                                 break;
2003                         }
2004                         frm += frm[1] + 2;
2005                 }
2006                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2007                 if (xrates != NULL)
2008                         IEEE80211_VERIFY_ELEMENT(xrates,
2009                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2010                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2011                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2012                 if (htcap != NULL) {
2013                         IEEE80211_VERIFY_LENGTH(htcap[1],
2014                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2015                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2016                                  sizeof(struct ieee80211_ie_htcap)-2,
2017                              return);           /* XXX just NULL out? */
2018                 }
2019
2020                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2021                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2022                         return;
2023                 /* discard challenge after association */
2024                 if (ni->ni_challenge != NULL) {
2025                         free(ni->ni_challenge, M_80211_NODE);
2026                         ni->ni_challenge = NULL;
2027                 }
2028                 /* NB: 802.11 spec says to ignore station's privacy bit */
2029                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2030                         capinfomismatch(ni, wh, reassoc, resp,
2031                             "capability", capinfo);
2032                         return;
2033                 }
2034                 /*
2035                  * Disallow re-associate w/ invalid slot time setting.
2036                  */
2037                 if (ni->ni_associd != 0 &&
2038                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2039                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2040                         capinfomismatch(ni, wh, reassoc, resp,
2041                             "slot time", capinfo);
2042                         return;
2043                 }
2044                 rate = ieee80211_setup_rates(ni, rates, xrates,
2045                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2046                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2047                 if (rate & IEEE80211_RATE_BASIC) {
2048                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2049                         vap->iv_stats.is_rx_assoc_norate++;
2050                         return;
2051                 }
2052                 /*
2053                  * If constrained to 11g-only stations reject an
2054                  * 11b-only station.  We cheat a bit here by looking
2055                  * at the max negotiated xmit rate and assuming anyone
2056                  * with a best rate <24Mb/s is an 11b station.
2057                  */
2058                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2059                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2060                         vap->iv_stats.is_rx_assoc_norate++;
2061                         return;
2062                 }
2063                 /*
2064                  * Do HT rate set handling and setup HT node state.
2065                  */
2066                 ni->ni_chan = vap->iv_bss->ni_chan;
2067                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2068                         rate = ieee80211_setup_htrates(ni, htcap,
2069                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2070                                 IEEE80211_F_DOBRS);
2071                         if (rate & IEEE80211_RATE_BASIC) {
2072                                 ratesetmismatch(ni, wh, reassoc, resp,
2073                                     "HT", rate);
2074                                 vap->iv_stats.is_ht_assoc_norate++;
2075                                 return;
2076                         }
2077                         ieee80211_ht_node_init(ni);
2078                         ieee80211_ht_updatehtcap(ni, htcap);
2079                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2080                         ieee80211_ht_node_cleanup(ni);
2081 #ifdef IEEE80211_SUPPORT_SUPERG
2082                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2083                         ieee80211_ff_node_cleanup(ni);
2084 #endif
2085                 /*
2086                  * Allow AMPDU operation only with unencrypted traffic
2087                  * or AES-CCM; the 11n spec only specifies these ciphers
2088                  * so permitting any others is undefined and can lead
2089                  * to interoperability problems.
2090                  */
2091                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2092                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2093                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2094                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2095                         IEEE80211_NOTE(vap,
2096                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2097                             "disallow HT use because WEP or TKIP requested, "
2098                             "capinfo 0x%x ucastcipher %d", capinfo,
2099                             rsnparms.rsn_ucastcipher);
2100                         ieee80211_ht_node_cleanup(ni);
2101                         vap->iv_stats.is_ht_assoc_downgrade++;
2102                 }
2103                 /*
2104                  * If constrained to 11n-only stations reject legacy stations.
2105                  */
2106                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2107                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2108                         htcapmismatch(ni, wh, reassoc, resp);
2109                         vap->iv_stats.is_ht_assoc_nohtcap++;
2110                         return;
2111                 }
2112                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2113                 ni->ni_noise = nf;
2114                 ni->ni_intval = lintval;
2115                 ni->ni_capinfo = capinfo;
2116                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2117                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2118                 /*
2119                  * Store the IEs.
2120                  * XXX maybe better to just expand
2121                  */
2122                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2123 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2124                         if (wpa != NULL)
2125                                 setie(wpa_ie, wpa - sfrm);
2126                         if (rsn != NULL)
2127                                 setie(rsn_ie, rsn - sfrm);
2128                         if (htcap != NULL)
2129                                 setie(htcap_ie, htcap - sfrm);
2130                         if (wme != NULL) {
2131                                 setie(wme_ie, wme - sfrm);
2132                                 /*
2133                                  * Mark node as capable of QoS.
2134                                  */
2135                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2136                         } else
2137                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2138 #ifdef IEEE80211_SUPPORT_SUPERG
2139                         if (ath != NULL) {
2140                                 setie(ath_ie, ath - sfrm);
2141                                 /*
2142                                  * Parse ATH station parameters.
2143                                  */
2144                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2145                         } else
2146 #endif
2147                                 ni->ni_ath_flags = 0;
2148 #undef setie
2149                 } else {
2150                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2151                         ni->ni_ath_flags = 0;
2152                 }
2153                 ieee80211_node_join(ni, resp);
2154                 ieee80211_deliver_l2uf(ni);
2155                 break;
2156         }
2157
2158         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2159         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2160                 uint16_t reason;
2161
2162                 if (vap->iv_state != IEEE80211_S_RUN ||
2163                     /* NB: can happen when in promiscuous mode */
2164                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2165                         vap->iv_stats.is_rx_mgtdiscard++;
2166                         break;
2167                 }
2168                 /*
2169                  * deauth/disassoc frame format
2170                  *      [2] reason
2171                  */
2172                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2173                 reason = le16toh(*(uint16_t *)frm);
2174                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2175                         vap->iv_stats.is_rx_deauth++;
2176                         IEEE80211_NODE_STAT(ni, rx_deauth);
2177                 } else {
2178                         vap->iv_stats.is_rx_disassoc++;
2179                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2180                 }
2181                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2182                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2183                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2184                 if (ni != vap->iv_bss)
2185                         ieee80211_node_leave(ni);
2186                 break;
2187         }
2188
2189         case IEEE80211_FC0_SUBTYPE_ACTION:
2190                 if (vap->iv_state == IEEE80211_S_RUN) {
2191                         if (ieee80211_parse_action(ni, m0) == 0)
2192                                 ic->ic_recv_action(ni, wh, frm, efrm);
2193                 } else
2194                         vap->iv_stats.is_rx_mgtdiscard++;
2195                 break;
2196
2197         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2198         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2199         default:
2200                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2201                      wh, "mgt", "subtype 0x%x not handled", subtype);
2202                 vap->iv_stats.is_rx_badsubtype++;
2203                 break;
2204         }
2205 }
2206
2207 static void
2208 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2209 {
2210         switch (subtype) {
2211         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2212                 hostap_recv_pspoll(ni, m);
2213                 break;
2214         case IEEE80211_FC0_SUBTYPE_BAR:
2215                 ieee80211_recv_bar(ni, m);
2216                 break;
2217         }
2218 }
2219
2220 /*
2221  * Process a received ps-poll frame.
2222  */
2223 static void
2224 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2225 {
2226         struct ieee80211vap *vap = ni->ni_vap;
2227         struct ieee80211_frame_min *wh;
2228         struct ifnet *ifp;
2229         struct mbuf *m;
2230         uint16_t aid;
2231         int qlen;
2232
2233         wh = mtod(m0, struct ieee80211_frame_min *);
2234         if (ni->ni_associd == 0) {
2235                 IEEE80211_DISCARD(vap,
2236                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2237                     (struct ieee80211_frame *) wh, NULL,
2238                     "%s", "unassociated station");
2239                 vap->iv_stats.is_ps_unassoc++;
2240                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2241                         IEEE80211_REASON_NOT_ASSOCED);
2242                 return;
2243         }
2244
2245         aid = le16toh(*(uint16_t *)wh->i_dur);
2246         if (aid != ni->ni_associd) {
2247                 IEEE80211_DISCARD(vap,
2248                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2249                     (struct ieee80211_frame *) wh, NULL,
2250                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2251                     ni->ni_associd, aid);
2252                 vap->iv_stats.is_ps_badaid++;
2253                 /*
2254                  * NB: We used to deauth the station but it turns out
2255                  * the Blackberry Curve 8230 (and perhaps other devices)
2256                  * sometimes send the wrong AID when WME is negotiated.
2257                  * Being more lenient here seems ok as we already check
2258                  * the station is associated and we only return frames
2259                  * queued for the station (i.e. we don't use the AID).
2260                  */
2261                 return;
2262         }
2263
2264         /* Okay, take the first queued packet and put it out... */
2265         m = ieee80211_node_psq_dequeue(ni, &qlen);
2266         if (m == NULL) {
2267                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2268                     "%s", "recv ps-poll, but queue empty");
2269                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2270                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2271                 if (vap->iv_set_tim != NULL)
2272                         vap->iv_set_tim(ni, 0); /* just in case */
2273                 return;
2274         }
2275         /*
2276          * If there are more packets, set the more packets bit
2277          * in the packet dispatched to the station; otherwise
2278          * turn off the TIM bit.
2279          */
2280         if (qlen != 0) {
2281                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2282                     "recv ps-poll, send packet, %u still queued", qlen);
2283                 m->m_flags |= M_MORE_DATA;
2284         } else {
2285                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2286                     "%s", "recv ps-poll, send packet, queue empty");
2287                 if (vap->iv_set_tim != NULL)
2288                         vap->iv_set_tim(ni, 0);
2289         }
2290         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2291
2292         if (m->m_flags & M_ENCAP)
2293                 ifp = vap->iv_ic->ic_ifp;
2294         else
2295                 ifp = vap->iv_ifp;
2296         IF_ENQUEUE(&ifp->if_snd, m);
2297         if_start(ifp);
2298 }