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 = 1;     /* mbuf need to be tapped. */
 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         type = -1;                      /* undefined */
 509
 510         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 511                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 512                     ni->ni_macaddr, NULL,
 513                     "too short (1): len %u", m->m_pkthdr.len);
 514                 vap->iv_stats.is_rx_tooshort++;
 515                 goto out;
 516         }
 517         /*
 518          * Bit of a cheat here, we use a pointer for a 3-address
 519          * frame format but don't reference fields past outside
 520          * ieee80211_frame_min w/o first validating the data is
 521          * present.
 522          */
 523         wh = mtod(m, struct ieee80211_frame *);
 524
 525         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 526             IEEE80211_FC0_VERSION_0) {
 527                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 528                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 529                     wh->i_fc[0], wh->i_fc[1]);
 530                 vap->iv_stats.is_rx_badversion++;
 531                 goto err;
 532         }
 533
 534         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 535         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 536         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 537         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 538                 if (dir != IEEE80211_FC1_DIR_NODS)
 539                         bssid = wh->i_addr1;
 540                 else if (type == IEEE80211_FC0_TYPE_CTL)
 541                         bssid = wh->i_addr1;
 542                 else {
 543                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 544                                 IEEE80211_DISCARD_MAC(vap,
 545                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 546                                     NULL, "too short (2): len %u",
 547                                     m->m_pkthdr.len);
 548                                 vap->iv_stats.is_rx_tooshort++;
 549                                 goto out;
 550                         }
 551                         bssid = wh->i_addr3;
 552                 }
 553                 /*
 554                  * Validate the bssid.
 555                  */
 556                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 557                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 558                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 559                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 560                         /* not interested in */
 561                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 562                             bssid, NULL, "%s", "not to bss");
 563                         vap->iv_stats.is_rx_wrongbss++;
 564                         goto out;
 565                 }
 566
 567                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 568                 ni->ni_noise = nf;
 569                 if (HAS_SEQ(type)) {
 570                         uint8_t tid = ieee80211_gettid(wh);
 571                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 572                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 573                                 ic->ic_wme.wme_hipri_traffic++;
 574                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 575                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 576                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 577                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 578                                 /* duplicate, discard */
 579                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 580                                     bssid, "duplicate",
 581                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 582                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 583                                     ni->ni_rxseqs[tid] >>
 584                                         IEEE80211_SEQ_SEQ_SHIFT,
 585                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 586                                     ni->ni_rxseqs[tid] &
 587                                         IEEE80211_SEQ_FRAG_MASK,
 588                                     tid);
 589                                 vap->iv_stats.is_rx_dup++;
 590                                 IEEE80211_NODE_STAT(ni, rx_dup);
 591                                 goto out;
 592                         }
 593                         ni->ni_rxseqs[tid] = rxseq;
 594                 }
 595         }
 596
 597         switch (type) {
 598         case IEEE80211_FC0_TYPE_DATA:
 599                 hdrspace = ieee80211_hdrspace(ic, wh);
 600                 if (m->m_len < hdrspace &&
 601                     (m = m_pullup(m, hdrspace)) == NULL) {
 602                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 603                             ni->ni_macaddr, NULL,
 604                             "data too short: expecting %u", hdrspace);
 605                         vap->iv_stats.is_rx_tooshort++;
 606                         goto out;               /* XXX */
 607                 }
 608                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 609                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 610                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 611                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 612                                 IEEE80211_DISCARD(vap,
 613                                     IEEE80211_MSG_INPUT, wh, "data",
 614                                     "incorrect dir 0x%x", dir);
 615                         } else {
 616                                 IEEE80211_DISCARD(vap,
 617                                     IEEE80211_MSG_INPUT |
 618                                     IEEE80211_MSG_WDS, wh,
 619                                     "4-address data",
 620                                     "%s", "DWDS not enabled");
 621                         }
 622                         vap->iv_stats.is_rx_wrongdir++;
 623                         goto out;
 624                 }
 625                 /* check if source STA is associated */
 626                 if (ni == vap->iv_bss) {
 627                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 628                             wh, "data", "%s", "unknown src");
 629                         ieee80211_send_error(ni, wh->i_addr2,
 630                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 631                             IEEE80211_REASON_NOT_AUTHED);
 632                         vap->iv_stats.is_rx_notassoc++;
 633                         goto err;
 634                 }
 635                 if (ni->ni_associd == 0) {
 636                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 637                             wh, "data", "%s", "unassoc src");
 638                         IEEE80211_SEND_MGMT(ni,
 639                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 640                             IEEE80211_REASON_NOT_ASSOCED);
 641                         vap->iv_stats.is_rx_notassoc++;
 642                         goto err;
 643                 }
 644
 645                 /*
 646                  * Check for power save state change.
 647                  * XXX out-of-order A-MPDU frames?
 648                  */
 649                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 650                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 651                         ieee80211_node_pwrsave(ni,
 652                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 653                 /*
 654                  * For 4-address packets handle WDS discovery
 655                  * notifications.  Once a WDS link is setup frames
 656                  * are just delivered to the WDS vap (see below).
 657                  */
 658                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 659                         if (!ieee80211_node_is_authorized(ni)) {
 660                                 IEEE80211_DISCARD(vap,
 661                                     IEEE80211_MSG_INPUT |
 662                                     IEEE80211_MSG_WDS, wh,
 663                                     "4-address data",
 664                                     "%s", "unauthorized port");
 665                                 vap->iv_stats.is_rx_unauth++;
 666                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 667                                 goto err;
 668                         }
 669                         ieee80211_dwds_discover(ni, m);
 670                         return type;
 671                 }
 672
 673                 /*
 674                  * Handle A-MPDU re-ordering.  If the frame is to be
 675                  * processed directly then ieee80211_ampdu_reorder
 676                  * will return 0; otherwise it has consumed the mbuf
 677                  * and we should do nothing more with it.
 678                  */
 679                 if ((m->m_flags & M_AMPDU) &&
 680                     ieee80211_ampdu_reorder(ni, m) != 0) {
 681                         m = NULL;
 682                         goto out;
 683                 }
 684         resubmit_ampdu:
 685
 686                 /*
 687                  * Handle privacy requirements.  Note that we
 688                  * must not be preempted from here until after
 689                  * we (potentially) call ieee80211_crypto_demic;
 690                  * otherwise we may violate assumptions in the
 691                  * crypto cipher modules used to do delayed update
 692                  * of replay sequence numbers.
 693                  */
 694                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 695                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 696                                 /*
 697                                  * Discard encrypted frames when privacy is off.
 698                                  */
 699                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 700                                     wh, "WEP", "%s", "PRIVACY off");
 701                                 vap->iv_stats.is_rx_noprivacy++;
 702                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 703                                 goto out;
 704                         }
 705                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 706                         if (key == NULL) {
 707                                 /* NB: stats+msgs handled in crypto_decap */
 708                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 709                                 goto out;
 710                         }
 711                         wh = mtod(m, struct ieee80211_frame *);
 712                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 713                 } else {
 714                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 715                         key = NULL;
 716                 }
 717
 718                 /*
 719                  * Save QoS bits for use below--before we strip the header.
 720                  */
 721                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 722                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 723                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 724                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 725                 } else
 726                         qos = 0;
 727
 728                 /*
 729                  * Next up, any fragmentation.
 730                  */
 731                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 732                         m = ieee80211_defrag(ni, m, hdrspace);
 733                         if (m == NULL) {
 734                                 /* Fragment dropped or frame not complete yet */
 735                                 goto out;
 736                         }
 737                 }
 738                 wh = NULL;              /* no longer valid, catch any uses */
 739
 740                 /*
 741                  * Next strip any MSDU crypto bits.
 742                  */
 743                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 744                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 745                             ni->ni_macaddr, "data", "%s", "demic error");
 746                         vap->iv_stats.is_rx_demicfail++;
 747                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 748                         goto out;
 749                 }
 750                 /* copy to listener after decrypt */
 751                 if (ieee80211_radiotap_active_vap(vap))
 752                         ieee80211_radiotap_rx(vap, m);
 753                 need_tap = 0;
 754                 /*
 755                  * Finally, strip the 802.11 header.
 756                  */
 757                 m = ieee80211_decap(vap, m, hdrspace);
 758                 if (m == NULL) {
 759                         /* XXX mask bit to check for both */
 760                         /* don't count Null data frames as errors */
 761                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 762                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 763                                 goto out;
 764                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 765                             ni->ni_macaddr, "data", "%s", "decap error");
 766                         vap->iv_stats.is_rx_decap++;
 767                         IEEE80211_NODE_STAT(ni, rx_decap);
 768                         goto err;
 769                 }
 770                 eh = mtod(m, struct ether_header *);
 771                 if (!ieee80211_node_is_authorized(ni)) {
 772                         /*
 773                          * Deny any non-PAE frames received prior to
 774                          * authorization.  For open/shared-key
 775                          * authentication the port is mark authorized
 776                          * after authentication completes.  For 802.1x
 777                          * the port is not marked authorized by the
 778                          * authenticator until the handshake has completed.
 779                          */
 780                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 781                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 782                                     eh->ether_shost, "data",
 783                                     "unauthorized port: ether type 0x%x len %u",
 784                                     eh->ether_type, m->m_pkthdr.len);
 785                                 vap->iv_stats.is_rx_unauth++;
 786                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 787                                 goto err;
 788                         }
 789                 } else {
 790                         /*
 791                          * When denying unencrypted frames, discard
 792                          * any non-PAE frames received without encryption.
 793                          */
 794                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 795                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 796                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 797                                 /*
 798                                  * Drop unencrypted frames.
 799                                  */
 800                                 vap->iv_stats.is_rx_unencrypted++;
 801                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 802                                 goto out;
 803                         }
 804                 }
 805                 /* XXX require HT? */
 806                 if (qos & IEEE80211_QOS_AMSDU) {
 807                         m = ieee80211_decap_amsdu(ni, m);
 808                         if (m == NULL)
 809                                 return IEEE80211_FC0_TYPE_DATA;
 810                 } else {
 811 #ifdef IEEE80211_SUPPORT_SUPERG
 812                         m = ieee80211_decap_fastframe(vap, ni, m);
 813                         if (m == NULL)
 814                                 return IEEE80211_FC0_TYPE_DATA;
 815 #endif
 816                 }
 817                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 818                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 819                 else
 820                         hostap_deliver_data(vap, ni, m);
 821                 return IEEE80211_FC0_TYPE_DATA;
 822
 823         case IEEE80211_FC0_TYPE_MGT:
 824                 vap->iv_stats.is_rx_mgmt++;
 825                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 826                 if (dir != IEEE80211_FC1_DIR_NODS) {
 827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 828                             wh, "mgt", "incorrect dir 0x%x", dir);
 829                         vap->iv_stats.is_rx_wrongdir++;
 830                         goto err;
 831                 }
 832                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 833                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 834                             ni->ni_macaddr, "mgt", "too short: len %u",
 835                             m->m_pkthdr.len);
 836                         vap->iv_stats.is_rx_tooshort++;
 837                         goto out;
 838                 }
 839                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 840                         /* ensure return frames are unicast */
 841                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 842                             wh, NULL, "source is multicast: %s",
 843                             ether_sprintf(wh->i_addr2));
 844                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 845                         goto out;
 846                 }
 847 #ifdef IEEE80211_DEBUG
 848                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 849                     ieee80211_msg_dumppkts(vap)) {
 850                         if_printf(ifp, "received %s from %s rssi %d\n",
 851                             ieee80211_mgt_subtype_name[subtype >>
 852                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 853                             ether_sprintf(wh->i_addr2), rssi);
 854                 }
 855 #endif
 856                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 857                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 858                                 /*
 859                                  * Only shared key auth frames with a challenge
 860                                  * should be encrypted, discard all others.
 861                                  */
 862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                                     wh, NULL,
 864                                     "%s", "WEP set but not permitted");
 865                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 866                                 goto out;
 867                         }
 868                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 869                                 /*
 870                                  * Discard encrypted frames when privacy is off.
 871                                  */
 872                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 873                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 874                                 vap->iv_stats.is_rx_noprivacy++;
 875                                 goto out;
 876                         }
 877                         hdrspace = ieee80211_hdrspace(ic, wh);
 878                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 879                         if (key == NULL) {
 880                                 /* NB: stats+msgs handled in crypto_decap */
 881                                 goto out;
 882                         }
 883                         wh = mtod(m, struct ieee80211_frame *);
 884                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 885                 }
 886                 /*
 887                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 888                  * Otherwise iv_recv_mgmt() might pass another packet to
 889                  * radiotap, resulting in out of order packet captures.
 890                  */
 891                 if (ieee80211_radiotap_active_vap(vap))
 892                         ieee80211_radiotap_rx(vap, m);
 893                 need_tap = 0;
 894                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 895                 goto out;
 896
 897         case IEEE80211_FC0_TYPE_CTL:
 898                 vap->iv_stats.is_rx_ctl++;
 899                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 900                 vap->iv_recv_ctl(ni, m, subtype);
 901                 goto out;
 902         default:
 903                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 904                     wh, "bad", "frame type 0x%x", type);
 905                 /* should not come here */
 906                 break;
 907         }
 908 err:
 909         ifp->if_ierrors++;
 910 out:
 911         if (m != NULL) {
 912                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 913                         ieee80211_radiotap_rx(vap, m);
 914                 m_freem(m);
 915         }
 916         return type;
 917 #undef SEQ_LEQ
 918 }
 919
 920 static void
 921 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 922     int rssi, int nf, uint16_t seq, uint16_t status)
 923 {
 924         struct ieee80211vap *vap = ni->ni_vap;
 925
 926         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 927
 928         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 929                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 930                     ni->ni_macaddr, "open auth",
 931                     "bad sta auth mode %u", ni->ni_authmode);
 932                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 933                 /*
 934                  * Clear any challenge text that may be there if
 935                  * a previous shared key auth failed and then an
 936                  * open auth is attempted.
 937                  */
 938                 if (ni->ni_challenge != NULL) {
 939                         free(ni->ni_challenge, M_80211_NODE);
 940                         ni->ni_challenge = NULL;
 941                 }
 942                 /* XXX hack to workaround calling convention */
 943                 ieee80211_send_error(ni, wh->i_addr2,
 944                     IEEE80211_FC0_SUBTYPE_AUTH,
 945                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 946                 return;
 947         }
 948         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 949                 vap->iv_stats.is_rx_bad_auth++;
 950                 return;
 951         }
 952         /* always accept open authentication requests */
 953         if (ni == vap->iv_bss) {
 954                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 955                 if (ni == NULL)
 956                         return;
 957         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 958                 (void) ieee80211_ref_node(ni);
 959         /*
 960          * Mark the node as referenced to reflect that it's
 961          * reference count has been bumped to insure it remains
 962          * after the transaction completes.
 963          */
 964         ni->ni_flags |= IEEE80211_NODE_AREF;
 965         /*
 966          * Mark the node as requiring a valid association id
 967          * before outbound traffic is permitted.
 968          */
 969         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 970
 971         if (vap->iv_acl != NULL &&
 972             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 973                 /*
 974                  * When the ACL policy is set to RADIUS we defer the
 975                  * authorization to a user agent.  Dispatch an event,
 976                  * a subsequent MLME call will decide the fate of the
 977                  * station.  If the user agent is not present then the
 978                  * node will be reclaimed due to inactivity.
 979                  */
 980                 IEEE80211_NOTE_MAC(vap,
 981                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 982                     "%s", "station authentication defered (radius acl)");
 983                 ieee80211_notify_node_auth(ni);
 984         } else {
 985                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 986                 IEEE80211_NOTE_MAC(vap,
 987                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 988                     "%s", "station authenticated (open)");
 989                 /*
 990                  * When 802.1x is not in use mark the port
 991                  * authorized at this point so traffic can flow.
 992                  */
 993                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 994                         ieee80211_node_authorize(ni);
 995         }
 996 }
 997
 998 static void
 999 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1000     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1001     uint16_t seq, uint16_t status)
1002 {
1003         struct ieee80211vap *vap = ni->ni_vap;
1004         uint8_t *challenge;
1005         int allocbs, estatus;
1006
1007         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1008
1009         /*
1010          * NB: this can happen as we allow pre-shared key
1011          * authentication to be enabled w/o wep being turned
1012          * on so that configuration of these can be done
1013          * in any order.  It may be better to enforce the
1014          * ordering in which case this check would just be
1015          * for sanity/consistency.
1016          */
1017         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1018                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1019                     ni->ni_macaddr, "shared key auth",
1020                     "%s", " PRIVACY is disabled");
1021                 estatus = IEEE80211_STATUS_ALG;
1022                 goto bad;
1023         }
1024         /*
1025          * Pre-shared key authentication is evil; accept
1026          * it only if explicitly configured (it is supported
1027          * mainly for compatibility with clients like Mac OS X).
1028          */
1029         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1030             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1031                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1032                     ni->ni_macaddr, "shared key auth",
1033                     "bad sta auth mode %u", ni->ni_authmode);
1034                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1035                 estatus = IEEE80211_STATUS_ALG;
1036                 goto bad;
1037         }
1038
1039         challenge = NULL;
1040         if (frm + 1 < efrm) {
1041                 if ((frm[1] + 2) > (efrm - frm)) {
1042                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1043                             ni->ni_macaddr, "shared key auth",
1044                             "ie %d/%d too long",
1045                             frm[0], (frm[1] + 2) - (efrm - frm));
1046                         vap->iv_stats.is_rx_bad_auth++;
1047                         estatus = IEEE80211_STATUS_CHALLENGE;
1048                         goto bad;
1049                 }
1050                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1051                         challenge = frm;
1052                 frm += frm[1] + 2;
1053         }
1054         switch (seq) {
1055         case IEEE80211_AUTH_SHARED_CHALLENGE:
1056         case IEEE80211_AUTH_SHARED_RESPONSE:
1057                 if (challenge == NULL) {
1058                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1059                             ni->ni_macaddr, "shared key auth",
1060                             "%s", "no challenge");
1061                         vap->iv_stats.is_rx_bad_auth++;
1062                         estatus = IEEE80211_STATUS_CHALLENGE;
1063                         goto bad;
1064                 }
1065                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1066                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1067                             ni->ni_macaddr, "shared key auth",
1068                             "bad challenge len %d", challenge[1]);
1069                         vap->iv_stats.is_rx_bad_auth++;
1070                         estatus = IEEE80211_STATUS_CHALLENGE;
1071                         goto bad;
1072                 }
1073         default:
1074                 break;
1075         }
1076         switch (seq) {
1077         case IEEE80211_AUTH_SHARED_REQUEST:
1078                 if (ni == vap->iv_bss) {
1079                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1080                         if (ni == NULL) {
1081                                 /* NB: no way to return an error */
1082                                 return;
1083                         }
1084                         allocbs = 1;
1085                 } else {
1086                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1087                                 (void) ieee80211_ref_node(ni);
1088                         allocbs = 0;
1089                 }
1090                 /*
1091                  * Mark the node as referenced to reflect that it's
1092                  * reference count has been bumped to insure it remains
1093                  * after the transaction completes.
1094                  */
1095                 ni->ni_flags |= IEEE80211_NODE_AREF;
1096                 /*
1097                  * Mark the node as requiring a valid associatio id
1098                  * before outbound traffic is permitted.
1099                  */
1100                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1101                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1102                 ni->ni_noise = nf;
1103                 if (!ieee80211_alloc_challenge(ni)) {
1104                         /* NB: don't return error so they rexmit */
1105                         return;
1106                 }
1107                 get_random_bytes(ni->ni_challenge,
1108                         IEEE80211_CHALLENGE_LEN);
1109                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1110                     ni, "shared key %sauth request", allocbs ? "" : "re");
1111                 /*
1112                  * When the ACL policy is set to RADIUS we defer the
1113                  * authorization to a user agent.  Dispatch an event,
1114                  * a subsequent MLME call will decide the fate of the
1115                  * station.  If the user agent is not present then the
1116                  * node will be reclaimed due to inactivity.
1117                  */
1118                 if (vap->iv_acl != NULL &&
1119                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1120                         IEEE80211_NOTE_MAC(vap,
1121                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1122                             ni->ni_macaddr,
1123                             "%s", "station authentication defered (radius acl)");
1124                         ieee80211_notify_node_auth(ni);
1125                         return;
1126                 }
1127                 break;
1128         case IEEE80211_AUTH_SHARED_RESPONSE:
1129                 if (ni == vap->iv_bss) {
1130                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1131                             ni->ni_macaddr, "shared key response",
1132                             "%s", "unknown station");
1133                         /* NB: don't send a response */
1134                         return;
1135                 }
1136                 if (ni->ni_challenge == NULL) {
1137                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1138                             ni->ni_macaddr, "shared key response",
1139                             "%s", "no challenge recorded");
1140                         vap->iv_stats.is_rx_bad_auth++;
1141                         estatus = IEEE80211_STATUS_CHALLENGE;
1142                         goto bad;
1143                 }
1144                 if (memcmp(ni->ni_challenge, &challenge[2],
1145                            challenge[1]) != 0) {
1146                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1147                             ni->ni_macaddr, "shared key response",
1148                             "%s", "challenge mismatch");
1149                         vap->iv_stats.is_rx_auth_fail++;
1150                         estatus = IEEE80211_STATUS_CHALLENGE;
1151                         goto bad;
1152                 }
1153                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1154                     ni, "%s", "station authenticated (shared key)");
1155                 ieee80211_node_authorize(ni);
1156                 break;
1157         default:
1158                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1159                     ni->ni_macaddr, "shared key auth",
1160                     "bad seq %d", seq);
1161                 vap->iv_stats.is_rx_bad_auth++;
1162                 estatus = IEEE80211_STATUS_SEQUENCE;
1163                 goto bad;
1164         }
1165         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1166         return;
1167 bad:
1168         /*
1169          * Send an error response; but only when operating as an AP.
1170          */
1171         /* XXX hack to workaround calling convention */
1172         ieee80211_send_error(ni, wh->i_addr2,
1173             IEEE80211_FC0_SUBTYPE_AUTH,
1174             (seq + 1) | (estatus<<16));
1175 }
1176
1177 /*
1178  * Convert a WPA cipher selector OUI to an internal
1179  * cipher algorithm.  Where appropriate we also
1180  * record any key length.
1181  */
1182 static int
1183 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1184 {
1185 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1186         uint32_t w = LE_READ_4(sel);
1187
1188         switch (w) {
1189         case WPA_SEL(WPA_CSE_NULL):
1190                 return IEEE80211_CIPHER_NONE;
1191         case WPA_SEL(WPA_CSE_WEP40):
1192                 if (keylen)
1193                         *keylen = 40 / NBBY;
1194                 return IEEE80211_CIPHER_WEP;
1195         case WPA_SEL(WPA_CSE_WEP104):
1196                 if (keylen)
1197                         *keylen = 104 / NBBY;
1198                 return IEEE80211_CIPHER_WEP;
1199         case WPA_SEL(WPA_CSE_TKIP):
1200                 return IEEE80211_CIPHER_TKIP;
1201         case WPA_SEL(WPA_CSE_CCMP):
1202                 return IEEE80211_CIPHER_AES_CCM;
1203         }
1204         return 32;              /* NB: so 1<< is discarded */
1205 #undef WPA_SEL
1206 }
1207
1208 /*
1209  * Convert a WPA key management/authentication algorithm
1210  * to an internal code.
1211  */
1212 static int
1213 wpa_keymgmt(const uint8_t *sel)
1214 {
1215 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1216         uint32_t w = LE_READ_4(sel);
1217
1218         switch (w) {
1219         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1220                 return WPA_ASE_8021X_UNSPEC;
1221         case WPA_SEL(WPA_ASE_8021X_PSK):
1222                 return WPA_ASE_8021X_PSK;
1223         case WPA_SEL(WPA_ASE_NONE):
1224                 return WPA_ASE_NONE;
1225         }
1226         return 0;               /* NB: so is discarded */
1227 #undef WPA_SEL
1228 }
1229
1230 /*
1231  * Parse a WPA information element to collect parameters.
1232  * Note that we do not validate security parameters; that
1233  * is handled by the authenticator; the parsing done here
1234  * is just for internal use in making operational decisions.
1235  */
1236 static int
1237 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1238         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1239 {
1240         uint8_t len = frm[1];
1241         uint32_t w;
1242         int n;
1243
1244         /*
1245          * Check the length once for fixed parts: OUI, type,
1246          * version, mcast cipher, and 2 selector counts.
1247          * Other, variable-length data, must be checked separately.
1248          */
1249         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1250                 IEEE80211_DISCARD_IE(vap,
1251                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1252                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1253                 return IEEE80211_REASON_IE_INVALID;
1254         }
1255         if (len < 14) {
1256                 IEEE80211_DISCARD_IE(vap,
1257                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1258                     wh, "WPA", "too short, len %u", len);
1259                 return IEEE80211_REASON_IE_INVALID;
1260         }
1261         frm += 6, len -= 4;             /* NB: len is payload only */
1262         /* NB: iswpaoui already validated the OUI and type */
1263         w = LE_READ_2(frm);
1264         if (w != WPA_VERSION) {
1265                 IEEE80211_DISCARD_IE(vap,
1266                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1267                     wh, "WPA", "bad version %u", w);
1268                 return IEEE80211_REASON_IE_INVALID;
1269         }
1270         frm += 2, len -= 2;
1271
1272         memset(rsn, 0, sizeof(*rsn));
1273
1274         /* multicast/group cipher */
1275         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1276         frm += 4, len -= 4;
1277
1278         /* unicast ciphers */
1279         n = LE_READ_2(frm);
1280         frm += 2, len -= 2;
1281         if (len < n*4+2) {
1282                 IEEE80211_DISCARD_IE(vap,
1283                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1284                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1285                     len, n);
1286                 return IEEE80211_REASON_IE_INVALID;
1287         }
1288         w = 0;
1289         for (; n > 0; n--) {
1290                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1291                 frm += 4, len -= 4;
1292         }
1293         if (w & (1<<IEEE80211_CIPHER_TKIP))
1294                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1295         else
1296                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1297
1298         /* key management algorithms */
1299         n = LE_READ_2(frm);
1300         frm += 2, len -= 2;
1301         if (len < n*4) {
1302                 IEEE80211_DISCARD_IE(vap,
1303                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1304                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1305                     len, n);
1306                 return IEEE80211_REASON_IE_INVALID;
1307         }
1308         w = 0;
1309         for (; n > 0; n--) {
1310                 w |= wpa_keymgmt(frm);
1311                 frm += 4, len -= 4;
1312         }
1313         if (w & WPA_ASE_8021X_UNSPEC)
1314                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1315         else
1316                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1317
1318         if (len > 2)            /* optional capabilities */
1319                 rsn->rsn_caps = LE_READ_2(frm);
1320
1321         return 0;
1322 }
1323
1324 /*
1325  * Convert an RSN cipher selector OUI to an internal
1326  * cipher algorithm.  Where appropriate we also
1327  * record any key length.
1328  */
1329 static int
1330 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1331 {
1332 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1333         uint32_t w = LE_READ_4(sel);
1334
1335         switch (w) {
1336         case RSN_SEL(RSN_CSE_NULL):
1337                 return IEEE80211_CIPHER_NONE;
1338         case RSN_SEL(RSN_CSE_WEP40):
1339                 if (keylen)
1340                         *keylen = 40 / NBBY;
1341                 return IEEE80211_CIPHER_WEP;
1342         case RSN_SEL(RSN_CSE_WEP104):
1343                 if (keylen)
1344                         *keylen = 104 / NBBY;
1345                 return IEEE80211_CIPHER_WEP;
1346         case RSN_SEL(RSN_CSE_TKIP):
1347                 return IEEE80211_CIPHER_TKIP;
1348         case RSN_SEL(RSN_CSE_CCMP):
1349                 return IEEE80211_CIPHER_AES_CCM;
1350         case RSN_SEL(RSN_CSE_WRAP):
1351                 return IEEE80211_CIPHER_AES_OCB;
1352         }
1353         return 32;              /* NB: so 1<< is discarded */
1354 #undef WPA_SEL
1355 }
1356
1357 /*
1358  * Convert an RSN key management/authentication algorithm
1359  * to an internal code.
1360  */
1361 static int
1362 rsn_keymgmt(const uint8_t *sel)
1363 {
1364 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1365         uint32_t w = LE_READ_4(sel);
1366
1367         switch (w) {
1368         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1369                 return RSN_ASE_8021X_UNSPEC;
1370         case RSN_SEL(RSN_ASE_8021X_PSK):
1371                 return RSN_ASE_8021X_PSK;
1372         case RSN_SEL(RSN_ASE_NONE):
1373                 return RSN_ASE_NONE;
1374         }
1375         return 0;               /* NB: so is discarded */
1376 #undef RSN_SEL
1377 }
1378
1379 /*
1380  * Parse a WPA/RSN information element to collect parameters
1381  * and validate the parameters against what has been
1382  * configured for the system.
1383  */
1384 static int
1385 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1386         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1387 {
1388         uint8_t len = frm[1];
1389         uint32_t w;
1390         int n;
1391
1392         /*
1393          * Check the length once for fixed parts:
1394          * version, mcast cipher, and 2 selector counts.
1395          * Other, variable-length data, must be checked separately.
1396          */
1397         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1398                 IEEE80211_DISCARD_IE(vap,
1399                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1400                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1401                 return IEEE80211_REASON_IE_INVALID;
1402         }
1403         if (len < 10) {
1404                 IEEE80211_DISCARD_IE(vap,
1405                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1406                     wh, "RSN", "too short, len %u", len);
1407                 return IEEE80211_REASON_IE_INVALID;
1408         }
1409         frm += 2;
1410         w = LE_READ_2(frm);
1411         if (w != RSN_VERSION) {
1412                 IEEE80211_DISCARD_IE(vap,
1413                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1414                     wh, "RSN", "bad version %u", w);
1415                 return IEEE80211_REASON_IE_INVALID;
1416         }
1417         frm += 2, len -= 2;
1418
1419         memset(rsn, 0, sizeof(*rsn));
1420
1421         /* multicast/group cipher */
1422         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1423         frm += 4, len -= 4;
1424
1425         /* unicast ciphers */
1426         n = LE_READ_2(frm);
1427         frm += 2, len -= 2;
1428         if (len < n*4+2) {
1429                 IEEE80211_DISCARD_IE(vap,
1430                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1431                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1432                     len, n);
1433                 return IEEE80211_REASON_IE_INVALID;
1434         }
1435         w = 0;
1436         for (; n > 0; n--) {
1437                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1438                 frm += 4, len -= 4;
1439         }
1440         if (w & (1<<IEEE80211_CIPHER_TKIP))
1441                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1442         else
1443                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1444
1445         /* key management algorithms */
1446         n = LE_READ_2(frm);
1447         frm += 2, len -= 2;
1448         if (len < n*4) {
1449                 IEEE80211_DISCARD_IE(vap,
1450                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1451                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1452                     len, n);
1453                 return IEEE80211_REASON_IE_INVALID;
1454         }
1455         w = 0;
1456         for (; n > 0; n--) {
1457                 w |= rsn_keymgmt(frm);
1458                 frm += 4, len -= 4;
1459         }
1460         if (w & RSN_ASE_8021X_UNSPEC)
1461                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1462         else
1463                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1464
1465         /* optional RSN capabilities */
1466         if (len > 2)
1467                 rsn->rsn_caps = LE_READ_2(frm);
1468         /* XXXPMKID */
1469
1470         return 0;
1471 }
1472
1473 /*
1474  * WPA/802.11i assocation request processing.
1475  */
1476 static int
1477 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1478         const struct ieee80211_frame *wh, const uint8_t *wpa,
1479         const uint8_t *rsn, uint16_t capinfo)
1480 {
1481         struct ieee80211vap *vap = ni->ni_vap;
1482         uint8_t reason;
1483         int badwparsn;
1484
1485         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1486         if (wpa == NULL && rsn == NULL) {
1487                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1488                         /*
1489                          * W-Fi Protected Setup (WPS) permits
1490                          * clients to associate and pass EAPOL frames
1491                          * to establish initial credentials.
1492                          */
1493                         ni->ni_flags |= IEEE80211_NODE_WPS;
1494                         return 1;
1495                 }
1496                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1497                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1498                         /*
1499                          * Transitional Security Network.  Permits clients
1500                          * to associate and use WEP while WPA is configured.
1501                          */
1502                         ni->ni_flags |= IEEE80211_NODE_TSN;
1503                         return 1;
1504                 }
1505                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1506                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1507                 vap->iv_stats.is_rx_assoc_badwpaie++;
1508                 reason = IEEE80211_REASON_IE_INVALID;
1509                 goto bad;
1510         }
1511         /* assert right association security credentials */
1512         badwparsn = 0;                  /* NB: to silence compiler */
1513         switch (vap->iv_flags & IEEE80211_F_WPA) {
1514         case IEEE80211_F_WPA1:
1515                 badwparsn = (wpa == NULL);
1516                 break;
1517         case IEEE80211_F_WPA2:
1518                 badwparsn = (rsn == NULL);
1519                 break;
1520         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1521                 badwparsn = (wpa == NULL && rsn == NULL);
1522                 break;
1523         }
1524         if (badwparsn) {
1525                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1526                     wh, NULL,
1527                     "%s", "missing WPA/RSN IE in association request");
1528                 vap->iv_stats.is_rx_assoc_badwpaie++;
1529                 reason = IEEE80211_REASON_IE_INVALID;
1530                 goto bad;
1531         }
1532         /*
1533          * Parse WPA/RSN information element.
1534          */
1535         if (wpa != NULL)
1536                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1537         else
1538                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1539         if (reason != 0) {
1540                 /* XXX distinguish WPA/RSN? */
1541                 vap->iv_stats.is_rx_assoc_badwpaie++;
1542                 goto bad;
1543         }
1544         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1545             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1546             wpa != NULL ? "WPA" : "RSN",
1547             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1548             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1549             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1550
1551         return 1;
1552 bad:
1553         ieee80211_node_deauth(ni, reason);
1554         return 0;
1555 }
1556
1557 /* XXX find a better place for definition */
1558 struct l2_update_frame {
1559         struct ether_header eh;
1560         uint8_t dsap;
1561         uint8_t ssap;
1562         uint8_t control;
1563         uint8_t xid[3];
1564 }  __packed;
1565
1566 /*
1567  * Deliver a TGf L2UF frame on behalf of a station.
1568  * This primes any bridge when the station is roaming
1569  * between ap's on the same wired network.
1570  */
1571 static void
1572 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1573 {
1574         struct ieee80211vap *vap = ni->ni_vap;
1575         struct ifnet *ifp = vap->iv_ifp;
1576         struct mbuf *m;
1577         struct l2_update_frame *l2uf;
1578         struct ether_header *eh;
1579
1580         m = m_gethdr(M_NOWAIT, MT_DATA);
1581         if (m == NULL) {
1582                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1583                     "%s", "no mbuf for l2uf frame");
1584                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1585                 return;
1586         }
1587         l2uf = mtod(m, struct l2_update_frame *);
1588         eh = &l2uf->eh;
1589         /* dst: Broadcast address */
1590         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1591         /* src: associated STA */
1592         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1593         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1594
1595         l2uf->dsap = 0;
1596         l2uf->ssap = 0;
1597         l2uf->control = 0xf5;
1598         l2uf->xid[0] = 0x81;
1599         l2uf->xid[1] = 0x80;
1600         l2uf->xid[2] = 0x00;
1601
1602         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1603         hostap_deliver_data(vap, ni, m);
1604 }
1605
1606 static void
1607 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1608         int reassoc, int resp, const char *tag, int rate)
1609 {
1610         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1611             "deny %s request, %s rate set mismatch, rate/MCS %d",
1612             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1613         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1614         ieee80211_node_leave(ni);
1615 }
1616
1617 static void
1618 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1619         int reassoc, int resp, const char *tag, int capinfo)
1620 {
1621         struct ieee80211vap *vap = ni->ni_vap;
1622
1623         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1624             "deny %s request, %s mismatch 0x%x",
1625             reassoc ? "reassoc" : "assoc", tag, capinfo);
1626         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1627         ieee80211_node_leave(ni);
1628         vap->iv_stats.is_rx_assoc_capmismatch++;
1629 }
1630
1631 static void
1632 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1633         int reassoc, int resp)
1634 {
1635         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1636             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1637         /* XXX no better code */
1638         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1639         ieee80211_node_leave(ni);
1640 }
1641
1642 static void
1643 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1644         int algo, int seq, int status)
1645 {
1646         struct ieee80211vap *vap = ni->ni_vap;
1647
1648         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1649             wh, NULL, "unsupported alg %d", algo);
1650         vap->iv_stats.is_rx_auth_unsupported++;
1651         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1652             seq | (status << 16));
1653 }
1654
1655 static __inline int
1656 ishtmixed(const uint8_t *ie)
1657 {
1658         const struct ieee80211_ie_htinfo *ht =
1659             (const struct ieee80211_ie_htinfo *) ie;
1660         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1661             IEEE80211_HTINFO_OPMODE_MIXED;
1662 }
1663
1664 static int
1665 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1666 {
1667         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1668         int i;
1669
1670         /* NB: the 11b clients we care about will not have xrates */
1671         if (xrates != NULL || rates == NULL)
1672                 return 0;
1673         for (i = 0; i < rates[1]; i++) {
1674                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1675                 if (r > 2*11 || ((1<<r) & brates) == 0)
1676                         return 0;
1677         }
1678         return 1;
1679 }
1680
1681 static void
1682 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1683         int subtype, int rssi, int nf)
1684 {
1685         struct ieee80211vap *vap = ni->ni_vap;
1686         struct ieee80211com *ic = ni->ni_ic;
1687         struct ieee80211_frame *wh;
1688         uint8_t *frm, *efrm, *sfrm;
1689         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1690         int reassoc, resp;
1691         uint8_t rate;
1692
1693         wh = mtod(m0, struct ieee80211_frame *);
1694         frm = (uint8_t *)&wh[1];
1695         efrm = mtod(m0, uint8_t *) + m0->m_len;
1696         switch (subtype) {
1697         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1698         case IEEE80211_FC0_SUBTYPE_BEACON: {
1699                 struct ieee80211_scanparams scan;
1700                 /*
1701                  * We process beacon/probe response frames when scanning;
1702                  * otherwise we check beacon frames for overlapping non-ERP
1703                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1704                  */
1705                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1706                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1707                         vap->iv_stats.is_rx_mgtdiscard++;
1708                         return;
1709                 }
1710                 /* NB: accept off-channel frames */
1711                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1712                         return;
1713                 /*
1714                  * Count frame now that we know it's to be processed.
1715                  */
1716                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1717                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1718                         IEEE80211_NODE_STAT(ni, rx_beacons);
1719                 } else
1720                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1721                 /*
1722                  * If scanning, just pass information to the scan module.
1723                  */
1724                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1725                         if (scan.status == 0 &&         /* NB: on channel */
1726                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1727                                 /*
1728                                  * Actively scanning a channel marked passive;
1729                                  * send a probe request now that we know there
1730                                  * is 802.11 traffic present.
1731                                  *
1732                                  * XXX check if the beacon we recv'd gives
1733                                  * us what we need and suppress the probe req
1734                                  */
1735                                 ieee80211_probe_curchan(vap, 1);
1736                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1737                         }
1738                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1739                         return;
1740                 }
1741                 /*
1742                  * Check beacon for overlapping bss w/ non ERP stations.
1743                  * If we detect one and protection is configured but not
1744                  * enabled, enable it and start a timer that'll bring us
1745                  * out if we stop seeing the bss.
1746                  */
1747                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1748                     scan.status == 0 &&                 /* NB: on-channel */
1749                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1750                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1751                         ic->ic_lastnonerp = ticks;
1752                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1753                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1754                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1755                                 IEEE80211_NOTE_FRAME(vap,
1756                                     IEEE80211_MSG_ASSOC, wh,
1757                                     "non-ERP present on channel %d "
1758                                     "(saw erp 0x%x from channel %d), "
1759                                     "enable use of protection",
1760                                     ic->ic_curchan->ic_ieee,
1761                                     scan.erp, scan.chan);
1762                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1763                                 ieee80211_notify_erp(ic);
1764                         }
1765                 }
1766                 /*
1767                  * Check beacon for non-HT station on HT channel
1768                  * and update HT BSS occupancy as appropriate.
1769                  */
1770                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1771                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1772                                 /*
1773                                  * Off control channel; only check frames
1774                                  * that come in the extension channel when
1775                                  * operating w/ HT40.
1776                                  */
1777                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1778                                         break;
1779                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1780                                         break;
1781                         }
1782                         if (scan.htinfo == NULL) {
1783                                 ieee80211_htprot_update(ic,
1784                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1785                                     IEEE80211_HTINFO_NONHT_PRESENT);
1786                         } else if (ishtmixed(scan.htinfo)) {
1787                                 /* XXX? take NONHT_PRESENT from beacon? */
1788                                 ieee80211_htprot_update(ic,
1789                                     IEEE80211_HTINFO_OPMODE_MIXED |
1790                                     IEEE80211_HTINFO_NONHT_PRESENT);
1791                         }
1792                 }
1793                 break;
1794         }
1795
1796         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1797                 if (vap->iv_state != IEEE80211_S_RUN) {
1798                         vap->iv_stats.is_rx_mgtdiscard++;
1799                         return;
1800                 }
1801                 /*
1802                  * prreq frame format
1803                  *      [tlv] ssid
1804                  *      [tlv] supported rates
1805                  *      [tlv] extended supported rates
1806                  */
1807                 ssid = rates = xrates = NULL;
1808                 sfrm = frm;
1809                 while (efrm - frm > 1) {
1810                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1811                         switch (*frm) {
1812                         case IEEE80211_ELEMID_SSID:
1813                                 ssid = frm;
1814                                 break;
1815                         case IEEE80211_ELEMID_RATES:
1816                                 rates = frm;
1817                                 break;
1818                         case IEEE80211_ELEMID_XRATES:
1819                                 xrates = frm;
1820                                 break;
1821                         }
1822                         frm += frm[1] + 2;
1823                 }
1824                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1825                 if (xrates != NULL)
1826                         IEEE80211_VERIFY_ELEMENT(xrates,
1827                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1828                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1829                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1830                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1831                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1832                             wh, NULL,
1833                             "%s", "no ssid with ssid suppression enabled");
1834                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1835                         return;
1836                 }
1837
1838                 /* XXX find a better class or define it's own */
1839                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1840                     "%s", "recv probe req");
1841                 /*
1842                  * Some legacy 11b clients cannot hack a complete
1843                  * probe response frame.  When the request includes
1844                  * only a bare-bones rate set, communicate this to
1845                  * the transmit side.
1846                  */
1847                 ieee80211_send_proberesp(vap, wh->i_addr2,
1848                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1849                 break;
1850
1851         case IEEE80211_FC0_SUBTYPE_AUTH: {
1852                 uint16_t algo, seq, status;
1853
1854                 if (vap->iv_state != IEEE80211_S_RUN) {
1855                         vap->iv_stats.is_rx_mgtdiscard++;
1856                         return;
1857                 }
1858                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1859                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1860                             wh, NULL, "%s", "wrong bssid");
1861                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1862                         return;
1863                 }
1864                 /*
1865                  * auth frame format
1866                  *      [2] algorithm
1867                  *      [2] sequence
1868                  *      [2] status
1869                  *      [tlv*] challenge
1870                  */
1871                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1872                 algo   = le16toh(*(uint16_t *)frm);
1873                 seq    = le16toh(*(uint16_t *)(frm + 2));
1874                 status = le16toh(*(uint16_t *)(frm + 4));
1875                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1876                     "recv auth frame with algorithm %d seq %d", algo, seq);
1877                 /*
1878                  * Consult the ACL policy module if setup.
1879                  */
1880                 if (vap->iv_acl != NULL &&
1881                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1882                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1883                             wh, NULL, "%s", "disallowed by ACL");
1884                         vap->iv_stats.is_rx_acl++;
1885                         ieee80211_send_error(ni, wh->i_addr2,
1886                             IEEE80211_FC0_SUBTYPE_AUTH,
1887                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1888                         return;
1889                 }
1890                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1891                         IEEE80211_DISCARD(vap,
1892                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1893                             wh, NULL, "%s", "TKIP countermeasures enabled");
1894                         vap->iv_stats.is_rx_auth_countermeasures++;
1895                         ieee80211_send_error(ni, wh->i_addr2,
1896                                 IEEE80211_FC0_SUBTYPE_AUTH,
1897                                 IEEE80211_REASON_MIC_FAILURE);
1898                         return;
1899                 }
1900                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1901                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1902                             seq, status);
1903                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1904                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1905                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1906                         authalgreject(ni, wh, algo,
1907                             seq+1, IEEE80211_STATUS_ALG);
1908                         return;
1909                 } else {
1910                         /*
1911                          * We assume that an unknown algorithm is the result
1912                          * of a decryption failure on a shared key auth frame;
1913                          * return a status code appropriate for that instead
1914                          * of IEEE80211_STATUS_ALG.
1915                          *
1916                          * NB: a seq# of 4 is intentional; the decrypted
1917                          *     frame likely has a bogus seq value.
1918                          */
1919                         authalgreject(ni, wh, algo,
1920                             4, IEEE80211_STATUS_CHALLENGE);
1921                         return;
1922                 }
1923                 break;
1924         }
1925
1926         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1927         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1928                 uint16_t capinfo, lintval;
1929                 struct ieee80211_rsnparms rsnparms;
1930
1931                 if (vap->iv_state != IEEE80211_S_RUN) {
1932                         vap->iv_stats.is_rx_mgtdiscard++;
1933                         return;
1934                 }
1935                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1936                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1937                             wh, NULL, "%s", "wrong bssid");
1938                         vap->iv_stats.is_rx_assoc_bss++;
1939                         return;
1940                 }
1941                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1942                         reassoc = 1;
1943                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1944                 } else {
1945                         reassoc = 0;
1946                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1947                 }
1948                 if (ni == vap->iv_bss) {
1949                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1950                             "deny %s request, sta not authenticated",
1951                             reassoc ? "reassoc" : "assoc");
1952                         ieee80211_send_error(ni, wh->i_addr2,
1953                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1954                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1955                         vap->iv_stats.is_rx_assoc_notauth++;
1956                         return;
1957                 }
1958
1959                 /*
1960                  * asreq frame format
1961                  *      [2] capability information
1962                  *      [2] listen interval
1963                  *      [6*] current AP address (reassoc only)
1964                  *      [tlv] ssid
1965                  *      [tlv] supported rates
1966                  *      [tlv] extended supported rates
1967                  *      [tlv] WPA or RSN
1968                  *      [tlv] HT capabilities
1969                  *      [tlv] Atheros capabilities
1970                  */
1971                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1972                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1973                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1974                 if (reassoc)
1975                         frm += 6;       /* ignore current AP info */
1976                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1977                 sfrm = frm;
1978                 while (efrm - frm > 1) {
1979                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1980                         switch (*frm) {
1981                         case IEEE80211_ELEMID_SSID:
1982                                 ssid = frm;
1983                                 break;
1984                         case IEEE80211_ELEMID_RATES:
1985                                 rates = frm;
1986                                 break;
1987                         case IEEE80211_ELEMID_XRATES:
1988                                 xrates = frm;
1989                                 break;
1990                         case IEEE80211_ELEMID_RSN:
1991                                 rsn = frm;
1992                                 break;
1993                         case IEEE80211_ELEMID_HTCAP:
1994                                 htcap = frm;
1995                                 break;
1996                         case IEEE80211_ELEMID_VENDOR:
1997                                 if (iswpaoui(frm))
1998                                         wpa = frm;
1999                                 else if (iswmeinfo(frm))
2000                                         wme = frm;
2001 #ifdef IEEE80211_SUPPORT_SUPERG
2002                                 else if (isatherosoui(frm))
2003                                         ath = frm;
2004 #endif
2005                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2006                                         if (ishtcapoui(frm) && htcap == NULL)
2007                                                 htcap = frm;
2008                                 }
2009                                 break;
2010                         }
2011                         frm += frm[1] + 2;
2012                 }
2013                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2014                 if (xrates != NULL)
2015                         IEEE80211_VERIFY_ELEMENT(xrates,
2016                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2017                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2018                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2019                 if (htcap != NULL) {
2020                         IEEE80211_VERIFY_LENGTH(htcap[1],
2021                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2022                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2023                                  sizeof(struct ieee80211_ie_htcap)-2,
2024                              return);           /* XXX just NULL out? */
2025                 }
2026
2027                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2028                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2029                         return;
2030                 /* discard challenge after association */
2031                 if (ni->ni_challenge != NULL) {
2032                         free(ni->ni_challenge, M_80211_NODE);
2033                         ni->ni_challenge = NULL;
2034                 }
2035                 /* NB: 802.11 spec says to ignore station's privacy bit */
2036                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2037                         capinfomismatch(ni, wh, reassoc, resp,
2038                             "capability", capinfo);
2039                         return;
2040                 }
2041                 /*
2042                  * Disallow re-associate w/ invalid slot time setting.
2043                  */
2044                 if (ni->ni_associd != 0 &&
2045                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2046                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2047                         capinfomismatch(ni, wh, reassoc, resp,
2048                             "slot time", capinfo);
2049                         return;
2050                 }
2051                 rate = ieee80211_setup_rates(ni, rates, xrates,
2052                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2053                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2054                 if (rate & IEEE80211_RATE_BASIC) {
2055                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2056                         vap->iv_stats.is_rx_assoc_norate++;
2057                         return;
2058                 }
2059                 /*
2060                  * If constrained to 11g-only stations reject an
2061                  * 11b-only station.  We cheat a bit here by looking
2062                  * at the max negotiated xmit rate and assuming anyone
2063                  * with a best rate <24Mb/s is an 11b station.
2064                  */
2065                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2066                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2067                         vap->iv_stats.is_rx_assoc_norate++;
2068                         return;
2069                 }
2070                 /*
2071                  * Do HT rate set handling and setup HT node state.
2072                  */
2073                 ni->ni_chan = vap->iv_bss->ni_chan;
2074                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2075                         rate = ieee80211_setup_htrates(ni, htcap,
2076                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2077                                 IEEE80211_F_DOBRS);
2078                         if (rate & IEEE80211_RATE_BASIC) {
2079                                 ratesetmismatch(ni, wh, reassoc, resp,
2080                                     "HT", rate);
2081                                 vap->iv_stats.is_ht_assoc_norate++;
2082                                 return;
2083                         }
2084                         ieee80211_ht_node_init(ni);
2085                         ieee80211_ht_updatehtcap(ni, htcap);
2086                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2087                         ieee80211_ht_node_cleanup(ni);
2088 #ifdef IEEE80211_SUPPORT_SUPERG
2089                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2090                         ieee80211_ff_node_cleanup(ni);
2091 #endif
2092                 /*
2093                  * Allow AMPDU operation only with unencrypted traffic
2094                  * or AES-CCM; the 11n spec only specifies these ciphers
2095                  * so permitting any others is undefined and can lead
2096                  * to interoperability problems.
2097                  */
2098                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2099                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2100                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2101                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2102                         IEEE80211_NOTE(vap,
2103                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2104                             "disallow HT use because WEP or TKIP requested, "
2105                             "capinfo 0x%x ucastcipher %d", capinfo,
2106                             rsnparms.rsn_ucastcipher);
2107                         ieee80211_ht_node_cleanup(ni);
2108                         vap->iv_stats.is_ht_assoc_downgrade++;
2109                 }
2110                 /*
2111                  * If constrained to 11n-only stations reject legacy stations.
2112                  */
2113                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2114                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2115                         htcapmismatch(ni, wh, reassoc, resp);
2116                         vap->iv_stats.is_ht_assoc_nohtcap++;
2117                         return;
2118                 }
2119                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2120                 ni->ni_noise = nf;
2121                 ni->ni_intval = lintval;
2122                 ni->ni_capinfo = capinfo;
2123                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2124                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2125                 /*
2126                  * Store the IEs.
2127                  * XXX maybe better to just expand
2128                  */
2129                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2130 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2131                         if (wpa != NULL)
2132                                 setie(wpa_ie, wpa - sfrm);
2133                         if (rsn != NULL)
2134                                 setie(rsn_ie, rsn - sfrm);
2135                         if (htcap != NULL)
2136                                 setie(htcap_ie, htcap - sfrm);
2137                         if (wme != NULL) {
2138                                 setie(wme_ie, wme - sfrm);
2139                                 /*
2140                                  * Mark node as capable of QoS.
2141                                  */
2142                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2143                         } else
2144                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2145 #ifdef IEEE80211_SUPPORT_SUPERG
2146                         if (ath != NULL) {
2147                                 setie(ath_ie, ath - sfrm);
2148                                 /*
2149                                  * Parse ATH station parameters.
2150                                  */
2151                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2152                         } else
2153 #endif
2154                                 ni->ni_ath_flags = 0;
2155 #undef setie
2156                 } else {
2157                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2158                         ni->ni_ath_flags = 0;
2159                 }
2160                 ieee80211_node_join(ni, resp);
2161                 ieee80211_deliver_l2uf(ni);
2162                 break;
2163         }
2164
2165         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2166         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2167                 uint16_t reason;
2168
2169                 if (vap->iv_state != IEEE80211_S_RUN ||
2170                     /* NB: can happen when in promiscuous mode */
2171                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2172                         vap->iv_stats.is_rx_mgtdiscard++;
2173                         break;
2174                 }
2175                 /*
2176                  * deauth/disassoc frame format
2177                  *      [2] reason
2178                  */
2179                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2180                 reason = le16toh(*(uint16_t *)frm);
2181                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2182                         vap->iv_stats.is_rx_deauth++;
2183                         IEEE80211_NODE_STAT(ni, rx_deauth);
2184                 } else {
2185                         vap->iv_stats.is_rx_disassoc++;
2186                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2187                 }
2188                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2189                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2190                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2191                 if (ni != vap->iv_bss)
2192                         ieee80211_node_leave(ni);
2193                 break;
2194         }
2195
2196         case IEEE80211_FC0_SUBTYPE_ACTION:
2197                 if (vap->iv_state == IEEE80211_S_RUN) {
2198                         if (ieee80211_parse_action(ni, m0) == 0)
2199                                 ic->ic_recv_action(ni, wh, frm, efrm);
2200                 } else
2201                         vap->iv_stats.is_rx_mgtdiscard++;
2202                 break;
2203
2204         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2205         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2206         default:
2207                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2208                      wh, "mgt", "subtype 0x%x not handled", subtype);
2209                 vap->iv_stats.is_rx_badsubtype++;
2210                 break;
2211         }
2212 }
2213
2214 static void
2215 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2216 {
2217         switch (subtype) {
2218         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2219                 hostap_recv_pspoll(ni, m);
2220                 break;
2221         case IEEE80211_FC0_SUBTYPE_BAR:
2222                 ieee80211_recv_bar(ni, m);
2223                 break;
2224         }
2225 }
2226
2227 /*
2228  * Process a received ps-poll frame.
2229  */
2230 static void
2231 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2232 {
2233         struct ieee80211vap *vap = ni->ni_vap;
2234         struct ieee80211_frame_min *wh;
2235         struct ifnet *ifp;
2236         struct mbuf *m;
2237         uint16_t aid;
2238         int qlen;
2239
2240         wh = mtod(m0, struct ieee80211_frame_min *);
2241         if (ni->ni_associd == 0) {
2242                 IEEE80211_DISCARD(vap,
2243                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2244                     (struct ieee80211_frame *) wh, NULL,
2245                     "%s", "unassociated station");
2246                 vap->iv_stats.is_ps_unassoc++;
2247                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2248                         IEEE80211_REASON_NOT_ASSOCED);
2249                 return;
2250         }
2251
2252         aid = le16toh(*(uint16_t *)wh->i_dur);
2253         if (aid != ni->ni_associd) {
2254                 IEEE80211_DISCARD(vap,
2255                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2256                     (struct ieee80211_frame *) wh, NULL,
2257                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2258                     ni->ni_associd, aid);
2259                 vap->iv_stats.is_ps_badaid++;
2260                 /*
2261                  * NB: We used to deauth the station but it turns out
2262                  * the Blackberry Curve 8230 (and perhaps other devices)
2263                  * sometimes send the wrong AID when WME is negotiated.
2264                  * Being more lenient here seems ok as we already check
2265                  * the station is associated and we only return frames
2266                  * queued for the station (i.e. we don't use the AID).
2267                  */
2268                 return;
2269         }
2270
2271         /* Okay, take the first queued packet and put it out... */
2272         m = ieee80211_node_psq_dequeue(ni, &qlen);
2273         if (m == NULL) {
2274                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2275                     "%s", "recv ps-poll, but queue empty");
2276                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2277                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2278                 if (vap->iv_set_tim != NULL)
2279                         vap->iv_set_tim(ni, 0); /* just in case */
2280                 return;
2281         }
2282         /*
2283          * If there are more packets, set the more packets bit
2284          * in the packet dispatched to the station; otherwise
2285          * turn off the TIM bit.
2286          */
2287         if (qlen != 0) {
2288                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2289                     "recv ps-poll, send packet, %u still queued", qlen);
2290                 m->m_flags |= M_MORE_DATA;
2291         } else {
2292                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2293                     "%s", "recv ps-poll, send packet, queue empty");
2294                 if (vap->iv_set_tim != NULL)
2295                         vap->iv_set_tim(ni, 0);
2296         }
2297         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2298
2299         if (m->m_flags & M_ENCAP)
2300                 ifp = vap->iv_ic->ic_ifp;
2301         else
2302                 ifp = vap->iv_ifp;
2303         IF_ENQUEUE(&ifp->if_snd, m);
2304         if_start(ifp);
2305 }