sys/netproto/802_11/wlan/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  * $FreeBSD: head/sys/net80211/ieee80211_hostap.c 203422 2010-02-03 10:07:43Z rpaulo $
  26  */
  27
  28 /*
  29  * IEEE 802.11 HOSTAP mode support.
  30  */
  31 #include "opt_inet.h"
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/malloc.h>
  38 #include <sys/kernel.h>
  39
  40 #include <sys/socket.h>
  41 #include <sys/sockio.h>
  42 #include <sys/endian.h>
  43 #include <sys/errno.h>
  44 #include <sys/proc.h>
  45 #include <sys/sysctl.h>
  46
  47 #include <net/if.h>
  48 #include <net/if_media.h>
  49 #include <net/if_llc.h>
  50 #include <net/ifq_var.h>
  51 #include <net/ethernet.h>
  52 #include <net/route.h>
  53
  54 #include <net/bpf.h>
  55
  56 #include <netproto/802_11/ieee80211_var.h>
  57 #include <netproto/802_11/ieee80211_hostap.h>
  58 #include <netproto/802_11/ieee80211_input.h>
  59 #ifdef IEEE80211_SUPPORT_SUPERG
  60 #include <netproto/802_11/ieee80211_superg.h>
  61 #endif
  62 #include <netproto/802_11/ieee80211_wds.h>
  63
  64 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  65
  66 static  void hostap_vattach(struct ieee80211vap *);
  67 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  68 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  69             int rssi, int nf);
  70 static void hostap_deliver_data(struct ieee80211vap *,
  71             struct ieee80211_node *, struct mbuf *);
  72 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  73             int subtype, int rssi, int nf);
  74 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  75 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
  76
  77 void
  78 ieee80211_hostap_attach(struct ieee80211com *ic)
  79 {
  80         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  81 }
  82
  83 void
  84 ieee80211_hostap_detach(struct ieee80211com *ic)
  85 {
  86 }
  87
  88 static void
  89 hostap_vdetach(struct ieee80211vap *vap)
  90 {
  91 }
  92
  93 static void
  94 hostap_vattach(struct ieee80211vap *vap)
  95 {
  96         vap->iv_newstate = hostap_newstate;
  97         vap->iv_input = hostap_input;
  98         vap->iv_recv_mgmt = hostap_recv_mgmt;
  99         vap->iv_recv_ctl = hostap_recv_ctl;
 100         vap->iv_opdetach = hostap_vdetach;
 101         vap->iv_deliver_data = hostap_deliver_data;
 102 }
 103
 104 static void
 105 sta_disassoc(void *arg, struct ieee80211_node *ni)
 106 {
 107         struct ieee80211vap *vap = arg;
 108
 109         if (ni->ni_vap == vap && ni->ni_associd != 0) {
 110                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 111                         IEEE80211_REASON_ASSOC_LEAVE);
 112                 ieee80211_node_leave(ni);
 113         }
 114 }
 115
 116 static void
 117 sta_csa(void *arg, struct ieee80211_node *ni)
 118 {
 119         struct ieee80211vap *vap = arg;
 120
 121         if (ni->ni_vap == vap && ni->ni_associd != 0)
 122                 if (ni->ni_inact > vap->iv_inact_init) {
 123                         ni->ni_inact = vap->iv_inact_init;
 124                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 125                             "%s: inact %u", __func__, ni->ni_inact);
 126                 }
 127 }
 128
 129 static void
 130 sta_drop(void *arg, struct ieee80211_node *ni)
 131 {
 132         struct ieee80211vap *vap = arg;
 133
 134         if (ni->ni_vap == vap && ni->ni_associd != 0)
 135                 ieee80211_node_leave(ni);
 136 }
 137
 138 /*
 139  * Does a channel change require associated stations to re-associate
 140  * so protocol state is correct.  This is used when doing CSA across
 141  * bands or similar (e.g. HT -> legacy).
 142  */
 143 static int
 144 isbandchange(struct ieee80211com *ic)
 145 {
 146         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 147             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 148              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 149 }
 150
 151 /*
 152  * IEEE80211_M_HOSTAP vap state machine handler.
 153  */
 154 static int
 155 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 156 {
 157         struct ieee80211com *ic = vap->iv_ic;
 158         enum ieee80211_state ostate;
 159 #ifdef IEEE80211_DEBUG
 160         char ethstr[ETHER_ADDRSTRLEN + 1];
 161 #endif
 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                                     kether_ntoa(ni->ni_bssid, ethstr));
 308                                 ieee80211_print_essid(ni->ni_essid,
 309                                     ni->ni_esslen);
 310                                 /* XXX MCS/HT */
 311                                 kprintf(" 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         IFNET_STAT_INC(ifp, ipackets, 1);
 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, MB_DONTWAIT);
 380                         if (mcopy == NULL)
 381                                 IFNET_STAT_INC(ifp, oerrors, 1);
 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 err;
 414                         err = ieee80211_handoff(ifp, mcopy);
 415                         if (err) {
 416                                 /* NB: IFQ_HANDOFF reclaims mcopy */
 417                         } else {
 418                                 IFNET_STAT_INC(ifp, opackets, 1);
 419                         }
 420                 }
 421         }
 422         if (m != NULL) {
 423                 /*
 424                  * Mark frame as coming from vap's interface.
 425                  */
 426                 m->m_pkthdr.rcvif = ifp;
 427                 if (m->m_flags & M_MCAST) {
 428                         /*
 429                          * Spam DWDS vap's w/ multicast traffic.
 430                          */
 431                         /* XXX only if dwds in use? */
 432                         ieee80211_dwds_mcast(vap, m);
 433                 }
 434                 if (ni->ni_vlan != 0) {
 435                         /* attach vlan tag */
 436                         m->m_pkthdr.ether_vlantag = ni->ni_vlan;
 437                         m->m_flags |= M_VLANTAG;
 438                 }
 439                 ifp->if_input(ifp, m, NULL, -1);
 440         }
 441 }
 442
 443 /*
 444  * Decide if a received management frame should be
 445  * printed when debugging is enabled.  This filters some
 446  * of the less interesting frames that come frequently
 447  * (e.g. beacons).
 448  */
 449 static __inline int
 450 doprint(struct ieee80211vap *vap, int subtype)
 451 {
 452         switch (subtype) {
 453         case IEEE80211_FC0_SUBTYPE_BEACON:
 454                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 455         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 456                 return 0;
 457         }
 458         return 1;
 459 }
 460
 461 /*
 462  * Process a received frame.  The node associated with the sender
 463  * should be supplied.  If nothing was found in the node table then
 464  * the caller is assumed to supply a reference to iv_bss instead.
 465  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 466  * during AP scanning to select a AP to associate with; it can have
 467  * any units so long as values have consistent units and higher values
 468  * mean ``better signal''.  The receive timestamp is currently not used
 469  * by the 802.11 layer.
 470  */
 471 static int
 472 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 473 {
 474 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 475 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 476         struct ieee80211vap *vap = ni->ni_vap;
 477         struct ieee80211com *ic = ni->ni_ic;
 478         struct ifnet *ifp = vap->iv_ifp;
 479         struct ieee80211_frame *wh;
 480         struct ieee80211_key *key;
 481         struct ether_header *eh;
 482         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 483         uint8_t dir, type, subtype, qos;
 484         uint8_t *bssid;
 485         uint16_t rxseq;
 486 #ifdef IEEE80211_DEBUG
 487         char ethstr[ETHER_ADDRSTRLEN + 1];
 488 #endif
 489
 490         if (m->m_flags & M_AMPDU_MPDU) {
 491                 /*
 492                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 493                  * w/ M_AMPDU_MPDU marked have already passed through
 494                  * here but were received out of order and been held on
 495                  * the reorder queue.  When resubmitted they are marked
 496                  * with the M_AMPDU_MPDU flag and we can bypass most of
 497                  * the normal processing.
 498                  */
 499                 wh = mtod(m, struct ieee80211_frame *);
 500                 type = IEEE80211_FC0_TYPE_DATA;
 501                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 502                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 503                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 504                 goto resubmit_ampdu;
 505         }
 506
 507         KASSERT(ni != NULL, ("null node"));
 508         ni->ni_inact = ni->ni_inact_reload;
 509
 510         type = -1;                      /* undefined */
 511
 512         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 513                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 514                     ni->ni_macaddr, NULL,
 515                     "too short (1): len %u", m->m_pkthdr.len);
 516                 vap->iv_stats.is_rx_tooshort++;
 517                 goto out;
 518         }
 519         /*
 520          * Bit of a cheat here, we use a pointer for a 3-address
 521          * frame format but don't reference fields past outside
 522          * ieee80211_frame_min w/o first validating the data is
 523          * present.
 524          */
 525         wh = mtod(m, struct ieee80211_frame *);
 526
 527         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 528             IEEE80211_FC0_VERSION_0) {
 529                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 530                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 531                     wh->i_fc[0], wh->i_fc[1]);
 532                 vap->iv_stats.is_rx_badversion++;
 533                 goto err;
 534         }
 535
 536         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 537         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 538         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 539         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 540                 if (dir != IEEE80211_FC1_DIR_NODS)
 541                         bssid = wh->i_addr1;
 542                 else if (type == IEEE80211_FC0_TYPE_CTL)
 543                         bssid = wh->i_addr1;
 544                 else {
 545                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 546                                 IEEE80211_DISCARD_MAC(vap,
 547                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 548                                     NULL, "too short (2): len %u",
 549                                     m->m_pkthdr.len);
 550                                 vap->iv_stats.is_rx_tooshort++;
 551                                 goto out;
 552                         }
 553                         bssid = wh->i_addr3;
 554                 }
 555                 /*
 556                  * Validate the bssid.
 557                  */
 558                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 559                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 560                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 561                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 562                         /* not interested in */
 563                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 564                             bssid, NULL, "%s", "not to bss");
 565                         vap->iv_stats.is_rx_wrongbss++;
 566                         goto out;
 567                 }
 568
 569                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 570                 ni->ni_noise = nf;
 571                 if (HAS_SEQ(type)) {
 572                         uint8_t tid = ieee80211_gettid(wh);
 573                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 574                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 575                                 ic->ic_wme.wme_hipri_traffic++;
 576                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 577                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 578                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 579                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 580                                 /* duplicate, discard */
 581                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 582                                     bssid, "duplicate",
 583                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 584                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 585                                     ni->ni_rxseqs[tid] >>
 586                                         IEEE80211_SEQ_SEQ_SHIFT,
 587                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 588                                     ni->ni_rxseqs[tid] &
 589                                         IEEE80211_SEQ_FRAG_MASK,
 590                                     tid);
 591                                 vap->iv_stats.is_rx_dup++;
 592                                 IEEE80211_NODE_STAT(ni, rx_dup);
 593                                 goto out;
 594                         }
 595                         ni->ni_rxseqs[tid] = rxseq;
 596                 }
 597         }
 598
 599         switch (type) {
 600         case IEEE80211_FC0_TYPE_DATA:
 601                 hdrspace = ieee80211_hdrspace(ic, wh);
 602                 if (m->m_len < hdrspace &&
 603                     (m = m_pullup(m, hdrspace)) == NULL) {
 604                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 605                             ni->ni_macaddr, NULL,
 606                             "data too short: expecting %u", hdrspace);
 607                         vap->iv_stats.is_rx_tooshort++;
 608                         goto out;               /* XXX */
 609                 }
 610                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 611                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 612                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 613                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 614                                 IEEE80211_DISCARD(vap,
 615                                     IEEE80211_MSG_INPUT, wh, "data",
 616                                     "incorrect dir 0x%x", dir);
 617                         } else {
 618                                 IEEE80211_DISCARD(vap,
 619                                     IEEE80211_MSG_INPUT |
 620                                     IEEE80211_MSG_WDS, wh,
 621                                     "4-address data",
 622                                     "%s", "DWDS not enabled");
 623                         }
 624                         vap->iv_stats.is_rx_wrongdir++;
 625                         goto out;
 626                 }
 627                 /* check if source STA is associated */
 628                 if (ni == vap->iv_bss) {
 629                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 630                             wh, "data", "%s", "unknown src");
 631                         ieee80211_send_error(ni, wh->i_addr2,
 632                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 633                             IEEE80211_REASON_NOT_AUTHED);
 634                         vap->iv_stats.is_rx_notassoc++;
 635                         goto err;
 636                 }
 637                 if (ni->ni_associd == 0) {
 638                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 639                             wh, "data", "%s", "unassoc src");
 640                         IEEE80211_SEND_MGMT(ni,
 641                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 642                             IEEE80211_REASON_NOT_ASSOCED);
 643                         vap->iv_stats.is_rx_notassoc++;
 644                         goto err;
 645                 }
 646
 647                 /*
 648                  * Check for power save state change.
 649                  * XXX out-of-order A-MPDU frames?
 650                  */
 651                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 652                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 653                         ieee80211_node_pwrsave(ni,
 654                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 655                 /*
 656                  * For 4-address packets handle WDS discovery
 657                  * notifications.  Once a WDS link is setup frames
 658                  * are just delivered to the WDS vap (see below).
 659                  */
 660                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 661                         if (!ieee80211_node_is_authorized(ni)) {
 662                                 IEEE80211_DISCARD(vap,
 663                                     IEEE80211_MSG_INPUT |
 664                                     IEEE80211_MSG_WDS, wh,
 665                                     "4-address data",
 666                                     "%s", "unauthorized port");
 667                                 vap->iv_stats.is_rx_unauth++;
 668                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 669                                 goto err;
 670                         }
 671                         ieee80211_dwds_discover(ni, m);
 672                         return type;
 673                 }
 674
 675                 /*
 676                  * Handle A-MPDU re-ordering.  If the frame is to be
 677                  * processed directly then ieee80211_ampdu_reorder
 678                  * will return 0; otherwise it has consumed the mbuf
 679                  * and we should do nothing more with it.
 680                  */
 681                 if ((m->m_flags & M_AMPDU) &&
 682                     ieee80211_ampdu_reorder(ni, m) != 0) {
 683                         m = NULL;
 684                         goto out;
 685                 }
 686         resubmit_ampdu:
 687
 688                 /*
 689                  * Handle privacy requirements.  Note that we
 690                  * must not be preempted from here until after
 691                  * we (potentially) call ieee80211_crypto_demic;
 692                  * otherwise we may violate assumptions in the
 693                  * crypto cipher modules used to do delayed update
 694                  * of replay sequence numbers.
 695                  */
 696                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 697                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 698                                 /*
 699                                  * Discard encrypted frames when privacy is off.
 700                                  */
 701                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 702                                     wh, "WEP", "%s", "PRIVACY off");
 703                                 vap->iv_stats.is_rx_noprivacy++;
 704                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 705                                 goto out;
 706                         }
 707                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 708                         if (key == NULL) {
 709                                 /* NB: stats+msgs handled in crypto_decap */
 710                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 711                                 goto out;
 712                         }
 713                         wh = mtod(m, struct ieee80211_frame *);
 714                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 715                 } else {
 716                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 717                         key = NULL;
 718                 }
 719
 720                 /*
 721                  * Save QoS bits for use below--before we strip the header.
 722                  */
 723                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 724                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 725                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 726                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 727                 } else
 728                         qos = 0;
 729
 730                 /*
 731                  * Next up, any fragmentation.
 732                  */
 733                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 734                         m = ieee80211_defrag(ni, m, hdrspace);
 735                         if (m == NULL) {
 736                                 /* Fragment dropped or frame not complete yet */
 737                                 goto out;
 738                         }
 739                 }
 740                 wh = NULL;              /* no longer valid, catch any uses */
 741
 742                 /*
 743                  * Next strip any MSDU crypto bits.
 744                  */
 745                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 746                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 747                             ni->ni_macaddr, "data", "%s", "demic error");
 748                         vap->iv_stats.is_rx_demicfail++;
 749                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 750                         goto out;
 751                 }
 752                 /* copy to listener after decrypt */
 753                 if (ieee80211_radiotap_active_vap(vap))
 754                         ieee80211_radiotap_rx(vap, m);
 755                 need_tap = 0;
 756                 /*
 757                  * Finally, strip the 802.11 header.
 758                  */
 759                 m = ieee80211_decap(vap, m, hdrspace);
 760                 if (m == NULL) {
 761                         /* XXX mask bit to check for both */
 762                         /* don't count Null data frames as errors */
 763                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 764                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 765                                 goto out;
 766                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 767                             ni->ni_macaddr, "data", "%s", "decap error");
 768                         vap->iv_stats.is_rx_decap++;
 769                         IEEE80211_NODE_STAT(ni, rx_decap);
 770                         goto err;
 771                 }
 772                 eh = mtod(m, struct ether_header *);
 773                 if (!ieee80211_node_is_authorized(ni)) {
 774                         /*
 775                          * Deny any non-PAE frames received prior to
 776                          * authorization.  For open/shared-key
 777                          * authentication the port is mark authorized
 778                          * after authentication completes.  For 802.1x
 779                          * the port is not marked authorized by the
 780                          * authenticator until the handshake has completed.
 781                          */
 782                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 783                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 784                                     eh->ether_shost, "data",
 785                                     "unauthorized port: ether type 0x%x len %u",
 786                                     eh->ether_type, m->m_pkthdr.len);
 787                                 vap->iv_stats.is_rx_unauth++;
 788                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 789                                 goto err;
 790                         }
 791                 } else {
 792                         /*
 793                          * When denying unencrypted frames, discard
 794                          * any non-PAE frames received without encryption.
 795                          */
 796                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 797                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 798                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 799                                 /*
 800                                  * Drop unencrypted frames.
 801                                  */
 802                                 vap->iv_stats.is_rx_unencrypted++;
 803                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 804                                 goto out;
 805                         }
 806                 }
 807                 /* XXX require HT? */
 808                 if (qos & IEEE80211_QOS_AMSDU) {
 809                         m = ieee80211_decap_amsdu(ni, m);
 810                         if (m == NULL)
 811                                 return IEEE80211_FC0_TYPE_DATA;
 812                 } else {
 813 #ifdef IEEE80211_SUPPORT_SUPERG
 814                         m = ieee80211_decap_fastframe(vap, ni, m);
 815                         if (m == NULL)
 816                                 return IEEE80211_FC0_TYPE_DATA;
 817 #endif
 818                 }
 819                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 820                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 821                 else
 822                         hostap_deliver_data(vap, ni, m);
 823                 return IEEE80211_FC0_TYPE_DATA;
 824
 825         case IEEE80211_FC0_TYPE_MGT:
 826                 vap->iv_stats.is_rx_mgmt++;
 827                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 828                 if (dir != IEEE80211_FC1_DIR_NODS) {
 829                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 830                             wh, "mgt", "incorrect dir 0x%x", dir);
 831                         vap->iv_stats.is_rx_wrongdir++;
 832                         goto err;
 833                 }
 834                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 835                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 836                             ni->ni_macaddr, "mgt", "too short: len %u",
 837                             m->m_pkthdr.len);
 838                         vap->iv_stats.is_rx_tooshort++;
 839                         goto out;
 840                 }
 841                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 842                         /* ensure return frames are unicast */
 843                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 844                             wh, NULL, "source is multicast: %s",
 845                             kether_ntoa(wh->i_addr2, ethstr));
 846                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 847                         goto out;
 848                 }
 849 #ifdef IEEE80211_DEBUG
 850                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 851                     ieee80211_msg_dumppkts(vap)) {
 852                         if_printf(ifp, "received %s from %s rssi %d\n",
 853                             ieee80211_mgt_subtype_name[subtype >>
 854                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 855                             kether_ntoa(wh->i_addr2, ethstr), rssi);
 856                 }
 857 #endif
 858                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 859                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 860                                 /*
 861                                  * Only shared key auth frames with a challenge
 862                                  * should be encrypted, discard all others.
 863                                  */
 864                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 865                                     wh, NULL,
 866                                     "%s", "WEP set but not permitted");
 867                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 868                                 goto out;
 869                         }
 870                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 871                                 /*
 872                                  * Discard encrypted frames when privacy is off.
 873                                  */
 874                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 875                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 876                                 vap->iv_stats.is_rx_noprivacy++;
 877                                 goto out;
 878                         }
 879                         hdrspace = ieee80211_hdrspace(ic, wh);
 880                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 881                         if (key == NULL) {
 882                                 /* NB: stats+msgs handled in crypto_decap */
 883                                 goto out;
 884                         }
 885                         wh = mtod(m, struct ieee80211_frame *);
 886                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 887                 }
 888                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 889                 goto out;
 890
 891         case IEEE80211_FC0_TYPE_CTL:
 892                 vap->iv_stats.is_rx_ctl++;
 893                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 894                 vap->iv_recv_ctl(ni, m, subtype);
 895                 goto out;
 896         default:
 897                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 898                     wh, "bad", "frame type 0x%x", type);
 899                 /* should not come here */
 900                 break;
 901         }
 902 err:
 903         IFNET_STAT_INC(ifp, ierrors, 1);
 904 out:
 905         if (m != NULL) {
 906                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 907                         ieee80211_radiotap_rx(vap, m);
 908                 m_freem(m);
 909         }
 910         return type;
 911 #undef SEQ_LEQ
 912 }
 913
 914 static void
 915 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 916     int rssi, int nf, uint16_t seq, uint16_t status)
 917 {
 918         struct ieee80211vap *vap = ni->ni_vap;
 919
 920         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 921
 922         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 923                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 924                     ni->ni_macaddr, "open auth",
 925                     "bad sta auth mode %u", ni->ni_authmode);
 926                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 927                 /*
 928                  * Clear any challenge text that may be there if
 929                  * a previous shared key auth failed and then an
 930                  * open auth is attempted.
 931                  */
 932                 if (ni->ni_challenge != NULL) {
 933                         kfree(ni->ni_challenge, M_80211_NODE);
 934                         ni->ni_challenge = NULL;
 935                 }
 936                 /* XXX hack to workaround calling convention */
 937                 ieee80211_send_error(ni, wh->i_addr2,
 938                     IEEE80211_FC0_SUBTYPE_AUTH,
 939                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 940                 return;
 941         }
 942         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 943                 vap->iv_stats.is_rx_bad_auth++;
 944                 return;
 945         }
 946         /* always accept open authentication requests */
 947         if (ni == vap->iv_bss) {
 948                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 949                 if (ni == NULL)
 950                         return;
 951         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 952                 (void) ieee80211_ref_node(ni);
 953         /*
 954          * Mark the node as referenced to reflect that it's
 955          * reference count has been bumped to insure it remains
 956          * after the transaction completes.
 957          */
 958         ni->ni_flags |= IEEE80211_NODE_AREF;
 959         /*
 960          * Mark the node as requiring a valid association id
 961          * before outbound traffic is permitted.
 962          */
 963         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 964
 965         if (vap->iv_acl != NULL &&
 966             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 967                 /*
 968                  * When the ACL policy is set to RADIUS we defer the
 969                  * authorization to a user agent.  Dispatch an event,
 970                  * a subsequent MLME call will decide the fate of the
 971                  * station.  If the user agent is not present then the
 972                  * node will be reclaimed due to inactivity.
 973                  */
 974                 IEEE80211_NOTE_MAC(vap,
 975                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 976                     "%s", "station authentication defered (radius acl)");
 977                 ieee80211_notify_node_auth(ni);
 978         } else {
 979                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 980                 IEEE80211_NOTE_MAC(vap,
 981                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 982                     "%s", "station authenticated (open)");
 983                 /*
 984                  * When 802.1x is not in use mark the port
 985                  * authorized at this point so traffic can flow.
 986                  */
 987                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 988                         ieee80211_node_authorize(ni);
 989         }
 990 }
 991
 992 static void
 993 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 994     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 995     uint16_t seq, uint16_t status)
 996 {
 997         struct ieee80211vap *vap = ni->ni_vap;
 998         uint8_t *challenge;
 999 #ifdef IEEE80211_DEBUG
1000         int allocbs;
1001 #endif
1002         int estatus;
1003
1004         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1005
1006         /*
1007          * NB: this can happen as we allow pre-shared key
1008          * authentication to be enabled w/o wep being turned
1009          * on so that configuration of these can be done
1010          * in any order.  It may be better to enforce the
1011          * ordering in which case this check would just be
1012          * for sanity/consistency.
1013          */
1014         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1015                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1016                     ni->ni_macaddr, "shared key auth",
1017                     "%s", " PRIVACY is disabled");
1018                 estatus = IEEE80211_STATUS_ALG;
1019                 goto bad;
1020         }
1021         /*
1022          * Pre-shared key authentication is evil; accept
1023          * it only if explicitly configured (it is supported
1024          * mainly for compatibility with clients like Mac OS X).
1025          */
1026         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1027             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1028                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1029                     ni->ni_macaddr, "shared key auth",
1030                     "bad sta auth mode %u", ni->ni_authmode);
1031                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1032                 estatus = IEEE80211_STATUS_ALG;
1033                 goto bad;
1034         }
1035
1036         challenge = NULL;
1037         if (frm + 1 < efrm) {
1038                 if ((frm[1] + 2) > (efrm - frm)) {
1039                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1040                             ni->ni_macaddr, "shared key auth",
1041                             "ie %d/%d too long",
1042                             frm[0], (int)((frm[1] + 2) - (efrm - frm)));
1043                         vap->iv_stats.is_rx_bad_auth++;
1044                         estatus = IEEE80211_STATUS_CHALLENGE;
1045                         goto bad;
1046                 }
1047                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1048                         challenge = frm;
1049                 frm += frm[1] + 2;
1050         }
1051         switch (seq) {
1052         case IEEE80211_AUTH_SHARED_CHALLENGE:
1053         case IEEE80211_AUTH_SHARED_RESPONSE:
1054                 if (challenge == NULL) {
1055                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1056                             ni->ni_macaddr, "shared key auth",
1057                             "%s", "no challenge");
1058                         vap->iv_stats.is_rx_bad_auth++;
1059                         estatus = IEEE80211_STATUS_CHALLENGE;
1060                         goto bad;
1061                 }
1062                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1063                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1064                             ni->ni_macaddr, "shared key auth",
1065                             "bad challenge len %d", challenge[1]);
1066                         vap->iv_stats.is_rx_bad_auth++;
1067                         estatus = IEEE80211_STATUS_CHALLENGE;
1068                         goto bad;
1069                 }
1070         default:
1071                 break;
1072         }
1073         switch (seq) {
1074         case IEEE80211_AUTH_SHARED_REQUEST:
1075                 if (ni == vap->iv_bss) {
1076                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1077                         if (ni == NULL) {
1078                                 /* NB: no way to return an error */
1079                                 return;
1080                         }
1081 #ifdef IEEE80211_DEBUG
1082                         allocbs = 1;
1083 #endif
1084                 } else {
1085                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1086                                 (void) ieee80211_ref_node(ni);
1087 #ifdef IEEE80211_DEBUG
1088                         allocbs = 0;
1089 #endif
1090                 }
1091                 /*
1092                  * Mark the node as referenced to reflect that it's
1093                  * reference count has been bumped to insure it remains
1094                  * after the transaction completes.
1095                  */
1096                 ni->ni_flags |= IEEE80211_NODE_AREF;
1097                 /*
1098                  * Mark the node as requiring a valid associatio id
1099                  * before outbound traffic is permitted.
1100                  */
1101                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1102                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1103                 ni->ni_noise = nf;
1104                 if (!ieee80211_alloc_challenge(ni)) {
1105                         /* NB: don't return error so they rexmit */
1106                         return;
1107                 }
1108                 get_random_bytes(ni->ni_challenge,
1109                         IEEE80211_CHALLENGE_LEN);
1110                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1111                     ni, "shared key %sauth request", allocbs ? "" : "re");
1112                 /*
1113                  * When the ACL policy is set to RADIUS we defer the
1114                  * authorization to a user agent.  Dispatch an event,
1115                  * a subsequent MLME call will decide the fate of the
1116                  * station.  If the user agent is not present then the
1117                  * node will be reclaimed due to inactivity.
1118                  */
1119                 if (vap->iv_acl != NULL &&
1120                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1121                         IEEE80211_NOTE_MAC(vap,
1122                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1123                             ni->ni_macaddr,
1124                             "%s", "station authentication defered (radius acl)");
1125                         ieee80211_notify_node_auth(ni);
1126                         return;
1127                 }
1128                 break;
1129         case IEEE80211_AUTH_SHARED_RESPONSE:
1130                 if (ni == vap->iv_bss) {
1131                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132                             ni->ni_macaddr, "shared key response",
1133                             "%s", "unknown station");
1134                         /* NB: don't send a response */
1135                         return;
1136                 }
1137                 if (ni->ni_challenge == NULL) {
1138                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139                             ni->ni_macaddr, "shared key response",
1140                             "%s", "no challenge recorded");
1141                         vap->iv_stats.is_rx_bad_auth++;
1142                         estatus = IEEE80211_STATUS_CHALLENGE;
1143                         goto bad;
1144                 }
1145                 if (memcmp(ni->ni_challenge, &challenge[2],
1146                            challenge[1]) != 0) {
1147                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148                             ni->ni_macaddr, "shared key response",
1149                             "%s", "challenge mismatch");
1150                         vap->iv_stats.is_rx_auth_fail++;
1151                         estatus = IEEE80211_STATUS_CHALLENGE;
1152                         goto bad;
1153                 }
1154                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1155                     ni, "%s", "station authenticated (shared key)");
1156                 ieee80211_node_authorize(ni);
1157                 break;
1158         default:
1159                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1160                     ni->ni_macaddr, "shared key auth",
1161                     "bad seq %d", seq);
1162                 vap->iv_stats.is_rx_bad_auth++;
1163                 estatus = IEEE80211_STATUS_SEQUENCE;
1164                 goto bad;
1165         }
1166         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1167         return;
1168 bad:
1169         /*
1170          * Send an error response; but only when operating as an AP.
1171          */
1172         /* XXX hack to workaround calling convention */
1173         ieee80211_send_error(ni, wh->i_addr2,
1174             IEEE80211_FC0_SUBTYPE_AUTH,
1175             (seq + 1) | (estatus<<16));
1176 }
1177
1178 /*
1179  * Convert a WPA cipher selector OUI to an internal
1180  * cipher algorithm.  Where appropriate we also
1181  * record any key length.
1182  */
1183 static int
1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1185 {
1186 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1187         uint32_t w = LE_READ_4(sel);
1188
1189         switch (w) {
1190         case WPA_SEL(WPA_CSE_NULL):
1191                 return IEEE80211_CIPHER_NONE;
1192         case WPA_SEL(WPA_CSE_WEP40):
1193                 if (keylen)
1194                         *keylen = 40 / NBBY;
1195                 return IEEE80211_CIPHER_WEP;
1196         case WPA_SEL(WPA_CSE_WEP104):
1197                 if (keylen)
1198                         *keylen = 104 / NBBY;
1199                 return IEEE80211_CIPHER_WEP;
1200         case WPA_SEL(WPA_CSE_TKIP):
1201                 return IEEE80211_CIPHER_TKIP;
1202         case WPA_SEL(WPA_CSE_CCMP):
1203                 return IEEE80211_CIPHER_AES_CCM;
1204         }
1205         return 32;              /* NB: so 1<< is discarded */
1206 #undef WPA_SEL
1207 }
1208
1209 /*
1210  * Convert a WPA key management/authentication algorithm
1211  * to an internal code.
1212  */
1213 static int
1214 wpa_keymgmt(const uint8_t *sel)
1215 {
1216 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1217         uint32_t w = LE_READ_4(sel);
1218
1219         switch (w) {
1220         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1221                 return WPA_ASE_8021X_UNSPEC;
1222         case WPA_SEL(WPA_ASE_8021X_PSK):
1223                 return WPA_ASE_8021X_PSK;
1224         case WPA_SEL(WPA_ASE_NONE):
1225                 return WPA_ASE_NONE;
1226         }
1227         return 0;               /* NB: so is discarded */
1228 #undef WPA_SEL
1229 }
1230
1231 /*
1232  * Parse a WPA information element to collect parameters.
1233  * Note that we do not validate security parameters; that
1234  * is handled by the authenticator; the parsing done here
1235  * is just for internal use in making operational decisions.
1236  */
1237 static int
1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1239         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1240 {
1241         uint8_t len = frm[1];
1242         uint32_t w;
1243         int n;
1244
1245         /*
1246          * Check the length once for fixed parts: OUI, type,
1247          * version, mcast cipher, and 2 selector counts.
1248          * Other, variable-length data, must be checked separately.
1249          */
1250         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1251                 IEEE80211_DISCARD_IE(vap,
1252                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1253                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1254                 return IEEE80211_REASON_IE_INVALID;
1255         }
1256         if (len < 14) {
1257                 IEEE80211_DISCARD_IE(vap,
1258                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1259                     wh, "WPA", "too short, len %u", len);
1260                 return IEEE80211_REASON_IE_INVALID;
1261         }
1262         frm += 6, len -= 4;             /* NB: len is payload only */
1263         /* NB: iswpaoui already validated the OUI and type */
1264         w = LE_READ_2(frm);
1265         if (w != WPA_VERSION) {
1266                 IEEE80211_DISCARD_IE(vap,
1267                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1268                     wh, "WPA", "bad version %u", w);
1269                 return IEEE80211_REASON_IE_INVALID;
1270         }
1271         frm += 2, len -= 2;
1272
1273         memset(rsn, 0, sizeof(*rsn));
1274
1275         /* multicast/group cipher */
1276         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1277         frm += 4, len -= 4;
1278
1279         /* unicast ciphers */
1280         n = LE_READ_2(frm);
1281         frm += 2, len -= 2;
1282         if (len < n*4+2) {
1283                 IEEE80211_DISCARD_IE(vap,
1284                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1285                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1286                     len, n);
1287                 return IEEE80211_REASON_IE_INVALID;
1288         }
1289         w = 0;
1290         for (; n > 0; n--) {
1291                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1292                 frm += 4, len -= 4;
1293         }
1294         if (w & (1<<IEEE80211_CIPHER_TKIP))
1295                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1296         else
1297                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1298
1299         /* key management algorithms */
1300         n = LE_READ_2(frm);
1301         frm += 2, len -= 2;
1302         if (len < n*4) {
1303                 IEEE80211_DISCARD_IE(vap,
1304                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1306                     len, n);
1307                 return IEEE80211_REASON_IE_INVALID;
1308         }
1309         w = 0;
1310         for (; n > 0; n--) {
1311                 w |= wpa_keymgmt(frm);
1312                 frm += 4, len -= 4;
1313         }
1314         if (w & WPA_ASE_8021X_UNSPEC)
1315                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1316         else
1317                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1318
1319         if (len > 2)            /* optional capabilities */
1320                 rsn->rsn_caps = LE_READ_2(frm);
1321
1322         return 0;
1323 }
1324
1325 /*
1326  * Convert an RSN cipher selector OUI to an internal
1327  * cipher algorithm.  Where appropriate we also
1328  * record any key length.
1329  */
1330 static int
1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1332 {
1333 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1334         uint32_t w = LE_READ_4(sel);
1335
1336         switch (w) {
1337         case RSN_SEL(RSN_CSE_NULL):
1338                 return IEEE80211_CIPHER_NONE;
1339         case RSN_SEL(RSN_CSE_WEP40):
1340                 if (keylen)
1341                         *keylen = 40 / NBBY;
1342                 return IEEE80211_CIPHER_WEP;
1343         case RSN_SEL(RSN_CSE_WEP104):
1344                 if (keylen)
1345                         *keylen = 104 / NBBY;
1346                 return IEEE80211_CIPHER_WEP;
1347         case RSN_SEL(RSN_CSE_TKIP):
1348                 return IEEE80211_CIPHER_TKIP;
1349         case RSN_SEL(RSN_CSE_CCMP):
1350                 return IEEE80211_CIPHER_AES_CCM;
1351         case RSN_SEL(RSN_CSE_WRAP):
1352                 return IEEE80211_CIPHER_AES_OCB;
1353         }
1354         return 32;              /* NB: so 1<< is discarded */
1355 #undef WPA_SEL
1356 }
1357
1358 /*
1359  * Convert an RSN key management/authentication algorithm
1360  * to an internal code.
1361  */
1362 static int
1363 rsn_keymgmt(const uint8_t *sel)
1364 {
1365 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1366         uint32_t w = LE_READ_4(sel);
1367
1368         switch (w) {
1369         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1370                 return RSN_ASE_8021X_UNSPEC;
1371         case RSN_SEL(RSN_ASE_8021X_PSK):
1372                 return RSN_ASE_8021X_PSK;
1373         case RSN_SEL(RSN_ASE_NONE):
1374                 return RSN_ASE_NONE;
1375         }
1376         return 0;               /* NB: so is discarded */
1377 #undef RSN_SEL
1378 }
1379
1380 /*
1381  * Parse a WPA/RSN information element to collect parameters
1382  * and validate the parameters against what has been
1383  * configured for the system.
1384  */
1385 static int
1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1387         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1388 {
1389         uint8_t len = frm[1];
1390         uint32_t w;
1391         int n;
1392
1393         /*
1394          * Check the length once for fixed parts:
1395          * version, mcast cipher, and 2 selector counts.
1396          * Other, variable-length data, must be checked separately.
1397          */
1398         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1399                 IEEE80211_DISCARD_IE(vap,
1400                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1401                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1402                 return IEEE80211_REASON_IE_INVALID;
1403         }
1404         if (len < 10) {
1405                 IEEE80211_DISCARD_IE(vap,
1406                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1407                     wh, "RSN", "too short, len %u", len);
1408                 return IEEE80211_REASON_IE_INVALID;
1409         }
1410         frm += 2;
1411         w = LE_READ_2(frm);
1412         if (w != RSN_VERSION) {
1413                 IEEE80211_DISCARD_IE(vap,
1414                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1415                     wh, "RSN", "bad version %u", w);
1416                 return IEEE80211_REASON_IE_INVALID;
1417         }
1418         frm += 2, len -= 2;
1419
1420         memset(rsn, 0, sizeof(*rsn));
1421
1422         /* multicast/group cipher */
1423         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1424         frm += 4, len -= 4;
1425
1426         /* unicast ciphers */
1427         n = LE_READ_2(frm);
1428         frm += 2, len -= 2;
1429         if (len < n*4+2) {
1430                 IEEE80211_DISCARD_IE(vap,
1431                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1432                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1433                     len, n);
1434                 return IEEE80211_REASON_IE_INVALID;
1435         }
1436         w = 0;
1437         for (; n > 0; n--) {
1438                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1439                 frm += 4, len -= 4;
1440         }
1441         if (w & (1<<IEEE80211_CIPHER_TKIP))
1442                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1443         else
1444                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1445
1446         /* key management algorithms */
1447         n = LE_READ_2(frm);
1448         frm += 2, len -= 2;
1449         if (len < n*4) {
1450                 IEEE80211_DISCARD_IE(vap,
1451                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1452                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1453                     len, n);
1454                 return IEEE80211_REASON_IE_INVALID;
1455         }
1456         w = 0;
1457         for (; n > 0; n--) {
1458                 w |= rsn_keymgmt(frm);
1459                 frm += 4, len -= 4;
1460         }
1461         if (w & RSN_ASE_8021X_UNSPEC)
1462                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1463         else
1464                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1465
1466         /* optional RSN capabilities */
1467         if (len > 2)
1468                 rsn->rsn_caps = LE_READ_2(frm);
1469         /* XXXPMKID */
1470
1471         return 0;
1472 }
1473
1474 /*
1475  * WPA/802.11i assocation request processing.
1476  */
1477 static int
1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1479         const struct ieee80211_frame *wh, const uint8_t *wpa,
1480         const uint8_t *rsn, uint16_t capinfo)
1481 {
1482         struct ieee80211vap *vap = ni->ni_vap;
1483         uint8_t reason;
1484         int badwparsn;
1485
1486         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1487         if (wpa == NULL && rsn == NULL) {
1488                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1489                         /*
1490                          * W-Fi Protected Setup (WPS) permits
1491                          * clients to associate and pass EAPOL frames
1492                          * to establish initial credentials.
1493                          */
1494                         ni->ni_flags |= IEEE80211_NODE_WPS;
1495                         return 1;
1496                 }
1497                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1498                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1499                         /*
1500                          * Transitional Security Network.  Permits clients
1501                          * to associate and use WEP while WPA is configured.
1502                          */
1503                         ni->ni_flags |= IEEE80211_NODE_TSN;
1504                         return 1;
1505                 }
1506                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1507                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1508                 vap->iv_stats.is_rx_assoc_badwpaie++;
1509                 reason = IEEE80211_REASON_IE_INVALID;
1510                 goto bad;
1511         }
1512         /* assert right association security credentials */
1513         badwparsn = 0;                  /* NB: to silence compiler */
1514         switch (vap->iv_flags & IEEE80211_F_WPA) {
1515         case IEEE80211_F_WPA1:
1516                 badwparsn = (wpa == NULL);
1517                 break;
1518         case IEEE80211_F_WPA2:
1519                 badwparsn = (rsn == NULL);
1520                 break;
1521         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1522                 badwparsn = (wpa == NULL && rsn == NULL);
1523                 break;
1524         }
1525         if (badwparsn) {
1526                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1527                     wh, NULL,
1528                     "%s", "missing WPA/RSN IE in association request");
1529                 vap->iv_stats.is_rx_assoc_badwpaie++;
1530                 reason = IEEE80211_REASON_IE_INVALID;
1531                 goto bad;
1532         }
1533         /*
1534          * Parse WPA/RSN information element.
1535          */
1536         if (wpa != NULL)
1537                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1538         else
1539                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1540         if (reason != 0) {
1541                 /* XXX distinguish WPA/RSN? */
1542                 vap->iv_stats.is_rx_assoc_badwpaie++;
1543                 goto bad;
1544         }
1545         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1546             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1547             wpa != NULL ? "WPA" : "RSN",
1548             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1549             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1550             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1551
1552         return 1;
1553 bad:
1554         ieee80211_node_deauth(ni, reason);
1555         return 0;
1556 }
1557
1558 /* XXX find a better place for definition */
1559 struct l2_update_frame {
1560         struct ether_header eh;
1561         uint8_t dsap;
1562         uint8_t ssap;
1563         uint8_t control;
1564         uint8_t xid[3];
1565 }  __packed;
1566
1567 /*
1568  * Deliver a TGf L2UF frame on behalf of a station.
1569  * This primes any bridge when the station is roaming
1570  * between ap's on the same wired network.
1571  */
1572 static void
1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1574 {
1575         struct ieee80211vap *vap = ni->ni_vap;
1576         struct ifnet *ifp = vap->iv_ifp;
1577         struct mbuf *m;
1578         struct l2_update_frame *l2uf;
1579         struct ether_header *eh;
1580
1581         m = m_gethdr(MB_DONTWAIT, MT_DATA);
1582         if (m == NULL) {
1583                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1584                     "%s", "no mbuf for l2uf frame");
1585                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1586                 return;
1587         }
1588         l2uf = mtod(m, struct l2_update_frame *);
1589         eh = &l2uf->eh;
1590         /* dst: Broadcast address */
1591         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1592         /* src: associated STA */
1593         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1594         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1595
1596         l2uf->dsap = 0;
1597         l2uf->ssap = 0;
1598         l2uf->control = 0xf5;
1599         l2uf->xid[0] = 0x81;
1600         l2uf->xid[1] = 0x80;
1601         l2uf->xid[2] = 0x00;
1602
1603         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1604         hostap_deliver_data(vap, ni, m);
1605 }
1606
1607 static void
1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1609         int reassoc, int resp, const char *tag, int rate)
1610 {
1611         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1612             "deny %s request, %s rate set mismatch, rate/MCS %d",
1613             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1614         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1615         ieee80211_node_leave(ni);
1616 }
1617
1618 static void
1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1620         int reassoc, int resp, const char *tag, int capinfo)
1621 {
1622         struct ieee80211vap *vap = ni->ni_vap;
1623
1624         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1625             "deny %s request, %s mismatch 0x%x",
1626             reassoc ? "reassoc" : "assoc", tag, capinfo);
1627         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1628         ieee80211_node_leave(ni);
1629         vap->iv_stats.is_rx_assoc_capmismatch++;
1630 }
1631
1632 static void
1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1634         int reassoc, int resp)
1635 {
1636         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1637             "deny %s request, missing HT ie", reassoc ? "reassoc" : "assoc");
1638         /* XXX no better code */
1639         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1640         ieee80211_node_leave(ni);
1641 }
1642
1643 static void
1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1645         int algo, int seq, int status)
1646 {
1647         struct ieee80211vap *vap = ni->ni_vap;
1648
1649         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1650             wh, NULL, "unsupported alg %d", algo);
1651         vap->iv_stats.is_rx_auth_unsupported++;
1652         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1653             seq | (status << 16));
1654 }
1655
1656 static __inline int
1657 ishtmixed(const uint8_t *ie)
1658 {
1659         const struct ieee80211_ie_htinfo *ht =
1660             (const struct ieee80211_ie_htinfo *) ie;
1661         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1662             IEEE80211_HTINFO_OPMODE_MIXED;
1663 }
1664
1665 static int
1666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1667 {
1668         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1669         int i;
1670
1671         /* NB: the 11b clients we care about will not have xrates */
1672         if (xrates != NULL || rates == NULL)
1673                 return 0;
1674         for (i = 0; i < rates[1]; i++) {
1675                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1676                 if (r > 2*11 || ((1<<r) & brates) == 0)
1677                         return 0;
1678         }
1679         return 1;
1680 }
1681
1682 static void
1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1684         int subtype, int rssi, int nf)
1685 {
1686         struct ieee80211vap *vap = ni->ni_vap;
1687         struct ieee80211com *ic = ni->ni_ic;
1688         struct ieee80211_frame *wh;
1689         uint8_t *frm, *efrm, *sfrm;
1690         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1691         int reassoc, resp;
1692         uint8_t rate;
1693
1694         wh = mtod(m0, struct ieee80211_frame *);
1695         frm = (uint8_t *)&wh[1];
1696         efrm = mtod(m0, uint8_t *) + m0->m_len;
1697         switch (subtype) {
1698         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1699         case IEEE80211_FC0_SUBTYPE_BEACON: {
1700                 struct ieee80211_scanparams scan;
1701                 /*
1702                  * We process beacon/probe response frames when scanning;
1703                  * otherwise we check beacon frames for overlapping non-ERP
1704                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1705                  */
1706                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1707                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1708                         vap->iv_stats.is_rx_mgtdiscard++;
1709                         return;
1710                 }
1711                 /* NB: accept off-channel frames */
1712                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1713                         return;
1714                 /*
1715                  * Count frame now that we know it's to be processed.
1716                  */
1717                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1718                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1719                         IEEE80211_NODE_STAT(ni, rx_beacons);
1720                 } else
1721                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1722                 /*
1723                  * If scanning, just pass information to the scan module.
1724                  */
1725                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1726                         if (scan.status == 0 &&         /* NB: on channel */
1727                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1728                                 /*
1729                                  * Actively scanning a channel marked passive;
1730                                  * send a probe request now that we know there
1731                                  * is 802.11 traffic present.
1732                                  *
1733                                  * XXX check if the beacon we recv'd gives
1734                                  * us what we need and suppress the probe req
1735                                  */
1736                                 ieee80211_probe_curchan(vap, 1);
1737                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1738                         }
1739                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1740                         return;
1741                 }
1742                 /*
1743                  * Check beacon for overlapping bss w/ non ERP stations.
1744                  * If we detect one and protection is configured but not
1745                  * enabled, enable it and start a timer that'll bring us
1746                  * out if we stop seeing the bss.
1747                  */
1748                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1749                     scan.status == 0 &&                 /* NB: on-channel */
1750                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1751                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1752                         ic->ic_lastnonerp = ticks;
1753                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1754                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1755                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1756                                 IEEE80211_NOTE_FRAME(vap,
1757                                     IEEE80211_MSG_ASSOC, wh,
1758                                     "non-ERP present on channel %d "
1759                                     "(saw erp 0x%x from channel %d), "
1760                                     "enable use of protection",
1761                                     ic->ic_curchan->ic_ieee,
1762                                     scan.erp, scan.chan);
1763                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1764                                 ieee80211_notify_erp(ic);
1765                         }
1766                 }
1767                 /*
1768                  * Check beacon for non-HT station on HT channel
1769                  * and update HT BSS occupancy as appropriate.
1770                  */
1771                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1772                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1773                                 /*
1774                                  * Off control channel; only check frames
1775                                  * that come in the extension channel when
1776                                  * operating w/ HT40.
1777                                  */
1778                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1779                                         break;
1780                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1781                                         break;
1782                         }
1783                         if (scan.htinfo == NULL) {
1784                                 ieee80211_htprot_update(ic,
1785                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1786                                     IEEE80211_HTINFO_NONHT_PRESENT);
1787                         } else if (ishtmixed(scan.htinfo)) {
1788                                 /* XXX? take NONHT_PRESENT from beacon? */
1789                                 ieee80211_htprot_update(ic,
1790                                     IEEE80211_HTINFO_OPMODE_MIXED |
1791                                     IEEE80211_HTINFO_NONHT_PRESENT);
1792                         }
1793                 }
1794                 break;
1795         }
1796
1797         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1798                 if (vap->iv_state != IEEE80211_S_RUN) {
1799                         vap->iv_stats.is_rx_mgtdiscard++;
1800                         return;
1801                 }
1802                 /*
1803                  * prreq frame format
1804                  *      [tlv] ssid
1805                  *      [tlv] supported rates
1806                  *      [tlv] extended supported rates
1807                  */
1808                 ssid = rates = xrates = NULL;
1809                 sfrm = frm;
1810                 while (efrm - frm > 1) {
1811                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1812                         switch (*frm) {
1813                         case IEEE80211_ELEMID_SSID:
1814                                 ssid = frm;
1815                                 break;
1816                         case IEEE80211_ELEMID_RATES:
1817                                 rates = frm;
1818                                 break;
1819                         case IEEE80211_ELEMID_XRATES:
1820                                 xrates = frm;
1821                                 break;
1822                         }
1823                         frm += frm[1] + 2;
1824                 }
1825                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1826                 if (xrates != NULL)
1827                         IEEE80211_VERIFY_ELEMENT(xrates,
1828                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1829                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1830                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1831                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1832                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1833                             wh, NULL,
1834                             "%s", "no ssid with ssid suppression enabled");
1835                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1836                         return;
1837                 }
1838
1839                 /* XXX find a better class or define it's own */
1840                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1841                     "%s", "recv probe req");
1842                 /*
1843                  * Some legacy 11b clients cannot hack a complete
1844                  * probe response frame.  When the request includes
1845                  * only a bare-bones rate set, communicate this to
1846                  * the transmit side.
1847                  */
1848                 ieee80211_send_proberesp(vap, wh->i_addr2,
1849                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1850                 break;
1851
1852         case IEEE80211_FC0_SUBTYPE_AUTH: {
1853                 uint16_t algo, seq, status;
1854
1855                 if (vap->iv_state != IEEE80211_S_RUN) {
1856                         vap->iv_stats.is_rx_mgtdiscard++;
1857                         return;
1858                 }
1859                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1860                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1861                             wh, NULL, "%s", "wrong bssid");
1862                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1863                         return;
1864                 }
1865                 /*
1866                  * auth frame format
1867                  *      [2] algorithm
1868                  *      [2] sequence
1869                  *      [2] status
1870                  *      [tlv*] challenge
1871                  */
1872                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1873                 algo   = le16toh(*(uint16_t *)frm);
1874                 seq    = le16toh(*(uint16_t *)(frm + 2));
1875                 status = le16toh(*(uint16_t *)(frm + 4));
1876                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1877                     "recv auth frame with algorithm %d seq %d", algo, seq);
1878                 /*
1879                  * Consult the ACL policy module if setup.
1880                  */
1881                 if (vap->iv_acl != NULL &&
1882                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1883                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1884                             wh, NULL, "%s", "disallowed by ACL");
1885                         vap->iv_stats.is_rx_acl++;
1886                         ieee80211_send_error(ni, wh->i_addr2,
1887                             IEEE80211_FC0_SUBTYPE_AUTH,
1888                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1889                         return;
1890                 }
1891                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1892                         IEEE80211_DISCARD(vap,
1893                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1894                             wh, NULL, "%s", "TKIP countermeasures enabled");
1895                         vap->iv_stats.is_rx_auth_countermeasures++;
1896                         ieee80211_send_error(ni, wh->i_addr2,
1897                                 IEEE80211_FC0_SUBTYPE_AUTH,
1898                                 IEEE80211_REASON_MIC_FAILURE);
1899                         return;
1900                 }
1901                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1902                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1903                             seq, status);
1904                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1905                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1906                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1907                         authalgreject(ni, wh, algo,
1908                             seq+1, IEEE80211_STATUS_ALG);
1909                         return;
1910                 } else {
1911                         /*
1912                          * We assume that an unknown algorithm is the result
1913                          * of a decryption failure on a shared key auth frame;
1914                          * return a status code appropriate for that instead
1915                          * of IEEE80211_STATUS_ALG.
1916                          *
1917                          * NB: a seq# of 4 is intentional; the decrypted
1918                          *     frame likely has a bogus seq value.
1919                          */
1920                         authalgreject(ni, wh, algo,
1921                             4, IEEE80211_STATUS_CHALLENGE);
1922                         return;
1923                 }
1924                 break;
1925         }
1926
1927         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1928         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1929                 uint16_t capinfo, lintval;
1930                 struct ieee80211_rsnparms rsnparms;
1931
1932                 if (vap->iv_state != IEEE80211_S_RUN) {
1933                         vap->iv_stats.is_rx_mgtdiscard++;
1934                         return;
1935                 }
1936                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1937                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1938                             wh, NULL, "%s", "wrong bssid");
1939                         vap->iv_stats.is_rx_assoc_bss++;
1940                         return;
1941                 }
1942                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1943                         reassoc = 1;
1944                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1945                 } else {
1946                         reassoc = 0;
1947                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1948                 }
1949                 if (ni == vap->iv_bss) {
1950                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1951                             "deny %s request, sta not authenticated",
1952                             reassoc ? "reassoc" : "assoc");
1953                         ieee80211_send_error(ni, wh->i_addr2,
1954                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1955                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1956                         vap->iv_stats.is_rx_assoc_notauth++;
1957                         return;
1958                 }
1959
1960                 /*
1961                  * asreq frame format
1962                  *      [2] capability information
1963                  *      [2] listen interval
1964                  *      [6*] current AP address (reassoc only)
1965                  *      [tlv] ssid
1966                  *      [tlv] supported rates
1967                  *      [tlv] extended supported rates
1968                  *      [tlv] WPA or RSN
1969                  *      [tlv] HT capabilities
1970                  *      [tlv] Atheros capabilities
1971                  */
1972                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1973                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1974                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1975                 if (reassoc)
1976                         frm += 6;       /* ignore current AP info */
1977                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1978                 sfrm = frm;
1979                 while (efrm - frm > 1) {
1980                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1981                         switch (*frm) {
1982                         case IEEE80211_ELEMID_SSID:
1983                                 ssid = frm;
1984                                 break;
1985                         case IEEE80211_ELEMID_RATES:
1986                                 rates = frm;
1987                                 break;
1988                         case IEEE80211_ELEMID_XRATES:
1989                                 xrates = frm;
1990                                 break;
1991                         case IEEE80211_ELEMID_RSN:
1992                                 rsn = frm;
1993                                 break;
1994                         case IEEE80211_ELEMID_HTCAP:
1995                                 htcap = frm;
1996                                 break;
1997                         case IEEE80211_ELEMID_VENDOR:
1998                                 if (iswpaoui(frm))
1999                                         wpa = frm;
2000                                 else if (iswmeinfo(frm))
2001                                         wme = frm;
2002 #ifdef IEEE80211_SUPPORT_SUPERG
2003                                 else if (isatherosoui(frm))
2004                                         ath = frm;
2005 #endif
2006                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2007                                         if (ishtcapoui(frm) && htcap == NULL)
2008                                                 htcap = frm;
2009                                 }
2010                                 break;
2011                         }
2012                         frm += frm[1] + 2;
2013                 }
2014                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2015                 if (xrates != NULL)
2016                         IEEE80211_VERIFY_ELEMENT(xrates,
2017                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2018                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2019                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2020                 if (htcap != NULL) {
2021                         IEEE80211_VERIFY_LENGTH(htcap[1],
2022                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2023                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2024                                  sizeof(struct ieee80211_ie_htcap)-2,
2025                              return);           /* XXX just NULL out? */
2026                 }
2027
2028                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2029                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2030                         return;
2031                 /* discard challenge after association */
2032                 if (ni->ni_challenge != NULL) {
2033                         kfree(ni->ni_challenge, M_80211_NODE);
2034                         ni->ni_challenge = NULL;
2035                 }
2036                 /* NB: 802.11 spec says to ignore station's privacy bit */
2037                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2038                         capinfomismatch(ni, wh, reassoc, resp,
2039                             "capability", capinfo);
2040                         return;
2041                 }
2042                 /*
2043                  * Disallow re-associate w/ invalid slot time setting.
2044                  */
2045                 if (ni->ni_associd != 0 &&
2046                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2047                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2048                         capinfomismatch(ni, wh, reassoc, resp,
2049                             "slot time", capinfo);
2050                         return;
2051                 }
2052                 rate = ieee80211_setup_rates(ni, rates, xrates,
2053                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2054                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2055                 if (rate & IEEE80211_RATE_BASIC) {
2056                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2057                         vap->iv_stats.is_rx_assoc_norate++;
2058                         return;
2059                 }
2060                 /*
2061                  * If constrained to 11g-only stations reject an
2062                  * 11b-only station.  We cheat a bit here by looking
2063                  * at the max negotiated xmit rate and assuming anyone
2064                  * with a best rate <24Mb/s is an 11b station.
2065                  */
2066                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2067                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2068                         vap->iv_stats.is_rx_assoc_norate++;
2069                         return;
2070                 }
2071                 /*
2072                  * Do HT rate set handling and setup HT node state.
2073                  */
2074                 ni->ni_chan = vap->iv_bss->ni_chan;
2075                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2076                         rate = ieee80211_setup_htrates(ni, htcap,
2077                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2078                                 IEEE80211_F_DOBRS);
2079                         if (rate & IEEE80211_RATE_BASIC) {
2080                                 ratesetmismatch(ni, wh, reassoc, resp,
2081                                     "HT", rate);
2082                                 vap->iv_stats.is_ht_assoc_norate++;
2083                                 return;
2084                         }
2085                         ieee80211_ht_node_init(ni);
2086                         ieee80211_ht_updatehtcap(ni, htcap);
2087                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2088                         ieee80211_ht_node_cleanup(ni);
2089 #ifdef IEEE80211_SUPPORT_SUPERG
2090                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2091                         ieee80211_ff_node_cleanup(ni);
2092 #endif
2093                 /*
2094                  * Allow AMPDU operation only with unencrypted traffic
2095                  * or AES-CCM; the 11n spec only specifies these ciphers
2096                  * so permitting any others is undefined and can lead
2097                  * to interoperability problems.
2098                  */
2099                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2100                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2101                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2102                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2103                         IEEE80211_NOTE(vap,
2104                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2105                             "disallow HT use because WEP or TKIP requested, "
2106                             "capinfo 0x%x ucastcipher %d", capinfo,
2107                             rsnparms.rsn_ucastcipher);
2108                         ieee80211_ht_node_cleanup(ni);
2109                         vap->iv_stats.is_ht_assoc_downgrade++;
2110                 }
2111                 /*
2112                  * If constrained to 11n-only stations reject legacy stations.
2113                  */
2114                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2115                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2116                         htcapmismatch(ni, wh, reassoc, resp);
2117                         vap->iv_stats.is_ht_assoc_nohtcap++;
2118                         return;
2119                 }
2120                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2121                 ni->ni_noise = nf;
2122                 ni->ni_intval = lintval;
2123                 ni->ni_capinfo = capinfo;
2124                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2125                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2126                 /*
2127                  * Store the IEs.
2128                  * XXX maybe better to just expand
2129                  */
2130                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2131 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2132                         if (wpa != NULL)
2133                                 setie(wpa_ie, wpa - sfrm);
2134                         if (rsn != NULL)
2135                                 setie(rsn_ie, rsn - sfrm);
2136                         if (htcap != NULL)
2137                                 setie(htcap_ie, htcap - sfrm);
2138                         if (wme != NULL) {
2139                                 setie(wme_ie, wme - sfrm);
2140                                 /*
2141                                  * Mark node as capable of QoS.
2142                                  */
2143                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2144                         } else
2145                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2146 #ifdef IEEE80211_SUPPORT_SUPERG
2147                         if (ath != NULL) {
2148                                 setie(ath_ie, ath - sfrm);
2149                                 /*
2150                                  * Parse ATH station parameters.
2151                                  */
2152                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2153                         } else
2154 #endif
2155                                 ni->ni_ath_flags = 0;
2156 #undef setie
2157                 } else {
2158                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2159                         ni->ni_ath_flags = 0;
2160                 }
2161                 ieee80211_node_join(ni, resp);
2162                 ieee80211_deliver_l2uf(ni);
2163                 break;
2164         }
2165
2166         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2167         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2168 #ifdef IEEE80211_DEBUG
2169                 uint16_t reason;
2170 #endif
2171
2172                 if (vap->iv_state != IEEE80211_S_RUN ||
2173                     /* NB: can happen when in promiscuous mode */
2174                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2175                         vap->iv_stats.is_rx_mgtdiscard++;
2176                         break;
2177                 }
2178                 /*
2179                  * deauth/disassoc frame format
2180                  *      [2] reason
2181                  */
2182                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2183 #ifdef IEEE80211_DEBUG
2184                 reason = le16toh(*(uint16_t *)frm);
2185 #endif
2186                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2187                         vap->iv_stats.is_rx_deauth++;
2188                         IEEE80211_NODE_STAT(ni, rx_deauth);
2189                 } else {
2190                         vap->iv_stats.is_rx_disassoc++;
2191                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2192                 }
2193                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2194                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2195                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2196                 if (ni != vap->iv_bss)
2197                         ieee80211_node_leave(ni);
2198                 break;
2199         }
2200
2201         case IEEE80211_FC0_SUBTYPE_ACTION:
2202                 if (vap->iv_state == IEEE80211_S_RUN) {
2203                         if (ieee80211_parse_action(ni, m0) == 0)
2204                                 ic->ic_recv_action(ni, wh, frm, efrm);
2205                 } else
2206                         vap->iv_stats.is_rx_mgtdiscard++;
2207                 break;
2208
2209         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2210         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2211         default:
2212                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2213                      wh, "mgt", "subtype 0x%x not handled", subtype);
2214                 vap->iv_stats.is_rx_badsubtype++;
2215                 break;
2216         }
2217 }
2218
2219 static void
2220 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2221 {
2222         switch (subtype) {
2223         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2224                 hostap_recv_pspoll(ni, m);
2225                 break;
2226         case IEEE80211_FC0_SUBTYPE_BAR:
2227                 ieee80211_recv_bar(ni, m);
2228                 break;
2229         }
2230 }
2231
2232 /*
2233  * Process a received ps-poll frame.
2234  */
2235 static void
2236 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2237 {
2238         struct ieee80211vap *vap = ni->ni_vap;
2239         struct ieee80211_frame_min *wh;
2240         struct ifnet *ifp;
2241         struct ifaltq_subque *ifsq;
2242         struct mbuf *m;
2243         uint16_t aid;
2244         int qlen;
2245
2246         wh = mtod(m0, struct ieee80211_frame_min *);
2247         if (ni->ni_associd == 0) {
2248                 IEEE80211_DISCARD(vap,
2249                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2250                     (struct ieee80211_frame *) wh, NULL,
2251                     "%s", "unassociated station");
2252                 vap->iv_stats.is_ps_unassoc++;
2253                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2254                         IEEE80211_REASON_NOT_ASSOCED);
2255                 return;
2256         }
2257
2258         aid = le16toh(*(uint16_t *)wh->i_dur);
2259         if (aid != ni->ni_associd) {
2260                 IEEE80211_DISCARD(vap,
2261                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2262                     (struct ieee80211_frame *) wh, NULL,
2263                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2264                     ni->ni_associd, aid);
2265                 vap->iv_stats.is_ps_badaid++;
2266                 /*
2267                  * NB: We used to deauth the station but it turns out
2268                  * the Blackberry Curve 8230 (and perhaps other devices)
2269                  * sometimes send the wrong AID when WME is negotiated.
2270                  * Being more lenient here seems ok as we already check
2271                  * the station is associated and we only return frames
2272                  * queued for the station (i.e. we don't use the AID).
2273                  */
2274                 return;
2275         }
2276
2277         /* Okay, take the first queued packet and put it out... */
2278         m = ieee80211_node_psq_dequeue(ni, &qlen);
2279         if (m == NULL) {
2280                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2281                     "%s", "recv ps-poll, but queue empty");
2282                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2283                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2284                 if (vap->iv_set_tim != NULL)
2285                         vap->iv_set_tim(ni, 0); /* just in case */
2286                 return;
2287         }
2288         /*
2289          * If there are more packets, set the more packets bit
2290          * in the packet dispatched to the station; otherwise
2291          * turn off the TIM bit.
2292          */
2293         if (qlen != 0) {
2294                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2295                     "recv ps-poll, send packet, %u still queued", qlen);
2296                 m->m_flags |= M_MORE_DATA;
2297         } else {
2298                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2299                     "%s", "recv ps-poll, send packet, queue empty");
2300                 if (vap->iv_set_tim != NULL)
2301                         vap->iv_set_tim(ni, 0);
2302         }
2303         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2304
2305         if (m->m_flags & M_ENCAP)
2306                 ifp = vap->iv_ic->ic_ifp;
2307         else
2308                 ifp = vap->iv_ifp;
2309
2310         ifsq = ifq_get_subq_default(&ifp->if_snd);
2311         ifsq_enqueue(ifsq, m, NULL);
2312         ifp->if_start(ifp, ifsq);
2313 }