sys/net80211/ieee80211_hostap.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 HOSTAP mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <net80211/ieee80211_var.h>
  59 #include <net80211/ieee80211_hostap.h>
  60 #include <net80211/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <net80211/ieee80211_superg.h>
  63 #endif
  64 #include <net80211/ieee80211_wds.h>
  65
  66 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  67
  68 static  void hostap_vattach(struct ieee80211vap *);
  69 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  70 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  71             const struct ieee80211_rx_stats *,
  72             int rssi, int nf);
  73 static void hostap_deliver_data(struct ieee80211vap *,
  74             struct ieee80211_node *, struct mbuf *);
  75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76             int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
  77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  78
  79 void
  80 ieee80211_hostap_attach(struct ieee80211com *ic)
  81 {
  82         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  83 }
  84
  85 void
  86 ieee80211_hostap_detach(struct ieee80211com *ic)
  87 {
  88 }
  89
  90 static void
  91 hostap_vdetach(struct ieee80211vap *vap)
  92 {
  93 }
  94
  95 static void
  96 hostap_vattach(struct ieee80211vap *vap)
  97 {
  98         vap->iv_newstate = hostap_newstate;
  99         vap->iv_input = hostap_input;
 100         vap->iv_recv_mgmt = hostap_recv_mgmt;
 101         vap->iv_recv_ctl = hostap_recv_ctl;
 102         vap->iv_opdetach = hostap_vdetach;
 103         vap->iv_deliver_data = hostap_deliver_data;
 104         vap->iv_recv_pspoll = ieee80211_recv_pspoll;
 105 }
 106
 107 static void
 108 sta_disassoc(void *arg, struct ieee80211_node *ni)
 109 {
 110         struct ieee80211vap *vap = arg;
 111
 112         if (ni->ni_vap == vap && ni->ni_associd != 0) {
 113                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 114                         IEEE80211_REASON_ASSOC_LEAVE);
 115                 ieee80211_node_leave(ni);
 116         }
 117 }
 118
 119 static void
 120 sta_csa(void *arg, struct ieee80211_node *ni)
 121 {
 122         struct ieee80211vap *vap = arg;
 123
 124         if (ni->ni_vap == vap && ni->ni_associd != 0)
 125                 if (ni->ni_inact > vap->iv_inact_init) {
 126                         ni->ni_inact = vap->iv_inact_init;
 127                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 128                             "%s: inact %u", __func__, ni->ni_inact);
 129                 }
 130 }
 131
 132 static void
 133 sta_drop(void *arg, struct ieee80211_node *ni)
 134 {
 135         struct ieee80211vap *vap = arg;
 136
 137         if (ni->ni_vap == vap && ni->ni_associd != 0)
 138                 ieee80211_node_leave(ni);
 139 }
 140
 141 /*
 142  * Does a channel change require associated stations to re-associate
 143  * so protocol state is correct.  This is used when doing CSA across
 144  * bands or similar (e.g. HT -> legacy).
 145  */
 146 static int
 147 isbandchange(struct ieee80211com *ic)
 148 {
 149         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 150             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 151              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 152 }
 153
 154 /*
 155  * IEEE80211_M_HOSTAP vap state machine handler.
 156  */
 157 static int
 158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 159 {
 160         struct ieee80211com *ic = vap->iv_ic;
 161         enum ieee80211_state ostate;
 162
 163         IEEE80211_LOCK_ASSERT(ic);
 164
 165         ostate = vap->iv_state;
 166         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 167             __func__, ieee80211_state_name[ostate],
 168             ieee80211_state_name[nstate], arg);
 169         vap->iv_state = nstate;                 /* state transition */
 170         if (ostate != IEEE80211_S_SCAN)
 171                 ieee80211_cancel_scan(vap);     /* background scan */
 172         switch (nstate) {
 173         case IEEE80211_S_INIT:
 174                 switch (ostate) {
 175                 case IEEE80211_S_SCAN:
 176                         ieee80211_cancel_scan(vap);
 177                         break;
 178                 case IEEE80211_S_CAC:
 179                         ieee80211_dfs_cac_stop(vap);
 180                         break;
 181                 case IEEE80211_S_RUN:
 182                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 183                         break;
 184                 default:
 185                         break;
 186                 }
 187                 if (ostate != IEEE80211_S_INIT) {
 188                         /* NB: optimize INIT -> INIT case */
 189                         ieee80211_reset_bss(vap);
 190                 }
 191                 if (vap->iv_auth->ia_detach != NULL)
 192                         vap->iv_auth->ia_detach(vap);
 193                 break;
 194         case IEEE80211_S_SCAN:
 195                 switch (ostate) {
 196                 case IEEE80211_S_CSA:
 197                 case IEEE80211_S_RUN:
 198                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 199                         /*
 200                          * Clear overlapping BSS state; the beacon frame
 201                          * will be reconstructed on transition to the RUN
 202                          * state and the timeout routines check if the flag
 203                          * is set before doing anything so this is sufficient.
 204                          */
 205                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 206                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 207                         /* fall thru... */
 208                 case IEEE80211_S_CAC:
 209                         /*
 210                          * NB: We may get here because of a manual channel
 211                          *     change in which case we need to stop CAC
 212                          * XXX no need to stop if ostate RUN but it's ok
 213                          */
 214                         ieee80211_dfs_cac_stop(vap);
 215                         /* fall thru... */
 216                 case IEEE80211_S_INIT:
 217                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 218                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 219                                 /*
 220                                  * Already have a channel; bypass the
 221                                  * scan and startup immediately.
 222                                  * ieee80211_create_ibss will call back to
 223                                  * move us to RUN state.
 224                                  */
 225                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 226                                 break;
 227                         }
 228                         /*
 229                          * Initiate a scan.  We can come here as a result
 230                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 231                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 232                          * and the scan request parameters will be present
 233                          * in iv_scanreq.  Otherwise we do the default.
 234                          */
 235                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 236                                 ieee80211_check_scan(vap,
 237                                     vap->iv_scanreq_flags,
 238                                     vap->iv_scanreq_duration,
 239                                     vap->iv_scanreq_mindwell,
 240                                     vap->iv_scanreq_maxdwell,
 241                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 242                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 243                         } else
 244                                 ieee80211_check_scan_current(vap);
 245                         break;
 246                 case IEEE80211_S_SCAN:
 247                         /*
 248                          * A state change requires a reset; scan.
 249                          */
 250                         ieee80211_check_scan_current(vap);
 251                         break;
 252                 default:
 253                         break;
 254                 }
 255                 break;
 256         case IEEE80211_S_CAC:
 257                 /*
 258                  * Start CAC on a DFS channel.  We come here when starting
 259                  * a bss on a DFS channel (see ieee80211_create_ibss).
 260                  */
 261                 ieee80211_dfs_cac_start(vap);
 262                 break;
 263         case IEEE80211_S_RUN:
 264                 if (vap->iv_flags & IEEE80211_F_WPA) {
 265                         /* XXX validate prerequisites */
 266                 }
 267                 switch (ostate) {
 268                 case IEEE80211_S_INIT:
 269                         /*
 270                          * Already have a channel; bypass the
 271                          * scan and startup immediately.
 272                          * Note that ieee80211_create_ibss will call
 273                          * back to do a RUN->RUN state change.
 274                          */
 275                         ieee80211_create_ibss(vap,
 276                             ieee80211_ht_adjust_channel(ic,
 277                                 ic->ic_curchan, vap->iv_flags_ht));
 278                         /* NB: iv_bss is changed on return */
 279                         break;
 280                 case IEEE80211_S_CAC:
 281                         /*
 282                          * NB: This is the normal state change when CAC
 283                          * expires and no radar was detected; no need to
 284                          * clear the CAC timer as it's already expired.
 285                          */
 286                         /* fall thru... */
 287                 case IEEE80211_S_CSA:
 288                         /*
 289                          * Shorten inactivity timer of associated stations
 290                          * to weed out sta's that don't follow a CSA.
 291                          */
 292                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
 293                         /*
 294                          * Update bss node channel to reflect where
 295                          * we landed after CSA.
 296                          */
 297                         ieee80211_node_set_chan(vap->iv_bss,
 298                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
 299                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
 300                         /* XXX bypass debug msgs */
 301                         break;
 302                 case IEEE80211_S_SCAN:
 303                 case IEEE80211_S_RUN:
 304 #ifdef IEEE80211_DEBUG
 305                         if (ieee80211_msg_debug(vap)) {
 306                                 struct ieee80211_node *ni = vap->iv_bss;
 307                                 ieee80211_note(vap,
 308                                     "synchronized with %s ssid ",
 309                                     ether_sprintf(ni->ni_bssid));
 310                                 ieee80211_print_essid(ni->ni_essid,
 311                                     ni->ni_esslen);
 312                                 /* XXX MCS/HT */
 313                                 printf(" channel %d start %uMb\n",
 314                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 315                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 316                         }
 317 #endif
 318                         break;
 319                 default:
 320                         break;
 321                 }
 322                 /*
 323                  * Start/stop the authenticator.  We delay until here
 324                  * to allow configuration to happen out of order.
 325                  */
 326                 if (vap->iv_auth->ia_attach != NULL) {
 327                         /* XXX check failure */
 328                         vap->iv_auth->ia_attach(vap);
 329                 } else if (vap->iv_auth->ia_detach != NULL) {
 330                         vap->iv_auth->ia_detach(vap);
 331                 }
 332                 ieee80211_node_authorize(vap->iv_bss);
 333                 break;
 334         case IEEE80211_S_CSA:
 335                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
 336                         /*
 337                          * On a ``band change'' silently drop associated
 338                          * stations as they must re-associate before they
 339                          * can pass traffic (as otherwise protocol state
 340                          * such as capabilities and the negotiated rate
 341                          * set may/will be wrong).
 342                          */
 343                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
 344                 }
 345                 break;
 346         default:
 347                 break;
 348         }
 349         return 0;
 350 }
 351
 352 static void
 353 hostap_deliver_data(struct ieee80211vap *vap,
 354         struct ieee80211_node *ni, struct mbuf *m)
 355 {
 356         struct ether_header *eh = mtod(m, struct ether_header *);
 357         struct ifnet *ifp = vap->iv_ifp;
 358
 359         /* clear driver/net80211 flags before passing up */
 360         m->m_flags &= ~(M_MCAST | M_BCAST);
 361         m_clrprotoflags(m);
 362
 363         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
 364             ("gack, opmode %d", vap->iv_opmode));
 365         /*
 366          * Do accounting.
 367          */
 368         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 369         IEEE80211_NODE_STAT(ni, rx_data);
 370         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 371         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 372                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
 373                 IEEE80211_NODE_STAT(ni, rx_mcast);
 374         } else
 375                 IEEE80211_NODE_STAT(ni, rx_ucast);
 376
 377         /* perform as a bridge within the AP */
 378         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
 379                 struct mbuf *mcopy = NULL;
 380
 381                 if (m->m_flags & M_MCAST) {
 382                         mcopy = m_dup(m, M_NOWAIT);
 383                         if (mcopy == NULL)
 384                                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 385                         else
 386                                 mcopy->m_flags |= M_MCAST;
 387                 } else {
 388                         /*
 389                          * Check if the destination is associated with the
 390                          * same vap and authorized to receive traffic.
 391                          * Beware of traffic destined for the vap itself;
 392                          * sending it will not work; just let it be delivered
 393                          * normally.
 394                          */
 395                         struct ieee80211_node *sta = ieee80211_find_vap_node(
 396                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
 397                         if (sta != NULL) {
 398                                 if (ieee80211_node_is_authorized(sta)) {
 399                                         /*
 400                                          * Beware of sending to ourself; this
 401                                          * needs to happen via the normal
 402                                          * input path.
 403                                          */
 404                                         if (sta != vap->iv_bss) {
 405                                                 mcopy = m;
 406                                                 m = NULL;
 407                                         }
 408                                 } else {
 409                                         vap->iv_stats.is_rx_unauth++;
 410                                         IEEE80211_NODE_STAT(sta, rx_unauth);
 411                                 }
 412                                 ieee80211_free_node(sta);
 413                         }
 414                 }
 415                 if (mcopy != NULL) {
 416                         int len, err;
 417                         len = mcopy->m_pkthdr.len;
 418                         err = ieee80211_vap_xmitpkt(vap, mcopy);
 419                         if (err) {
 420                                 /* NB: IFQ_HANDOFF reclaims mcopy */
 421                         } else {
 422                                 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 423                         }
 424                 }
 425         }
 426         if (m != NULL) {
 427                 /*
 428                  * Mark frame as coming from vap's interface.
 429                  */
 430                 m->m_pkthdr.rcvif = ifp;
 431                 if (m->m_flags & M_MCAST) {
 432                         /*
 433                          * Spam DWDS vap's w/ multicast traffic.
 434                          */
 435                         /* XXX only if dwds in use? */
 436                         ieee80211_dwds_mcast(vap, m);
 437                 }
 438                 if (ni->ni_vlan != 0) {
 439                         /* attach vlan tag */
 440                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
 441                         m->m_flags |= M_VLANTAG;
 442                 }
 443                 ifp->if_input(ifp, m);
 444         }
 445 }
 446
 447 /*
 448  * Decide if a received management frame should be
 449  * printed when debugging is enabled.  This filters some
 450  * of the less interesting frames that come frequently
 451  * (e.g. beacons).
 452  */
 453 static __inline int
 454 doprint(struct ieee80211vap *vap, int subtype)
 455 {
 456         switch (subtype) {
 457         case IEEE80211_FC0_SUBTYPE_BEACON:
 458                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 459         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 460                 return 0;
 461         }
 462         return 1;
 463 }
 464
 465 /*
 466  * Process a received frame.  The node associated with the sender
 467  * should be supplied.  If nothing was found in the node table then
 468  * the caller is assumed to supply a reference to iv_bss instead.
 469  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 470  * during AP scanning to select a AP to associate with; it can have
 471  * any units so long as values have consistent units and higher values
 472  * mean ``better signal''.  The receive timestamp is currently not used
 473  * by the 802.11 layer.
 474  */
 475 static int
 476 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
 477     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 478 {
 479         struct ieee80211vap *vap = ni->ni_vap;
 480         struct ieee80211com *ic = ni->ni_ic;
 481         struct ifnet *ifp = vap->iv_ifp;
 482         struct ieee80211_frame *wh;
 483         struct ieee80211_key *key;
 484         struct ether_header *eh;
 485         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 486         uint8_t dir, type, subtype, qos;
 487         uint8_t *bssid;
 488         uint16_t rxseq;
 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 (IEEE80211_HAS_SEQ(type, subtype)) {
 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 (! ieee80211_check_rxseq(ni, wh)) {
 578                                 /* duplicate, discard */
 579                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 580                                     bssid, "duplicate",
 581                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 582                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 583                                     ni->ni_rxseqs[tid] >>
 584                                         IEEE80211_SEQ_SEQ_SHIFT,
 585                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 586                                     ni->ni_rxseqs[tid] &
 587                                         IEEE80211_SEQ_FRAG_MASK,
 588                                     tid);
 589                                 vap->iv_stats.is_rx_dup++;
 590                                 IEEE80211_NODE_STAT(ni, rx_dup);
 591                                 goto out;
 592                         }
 593                         ni->ni_rxseqs[tid] = rxseq;
 594                 }
 595         }
 596
 597         switch (type) {
 598         case IEEE80211_FC0_TYPE_DATA:
 599                 hdrspace = ieee80211_hdrspace(ic, wh);
 600                 if (m->m_len < hdrspace &&
 601                     (m = m_pullup(m, hdrspace)) == NULL) {
 602                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 603                             ni->ni_macaddr, NULL,
 604                             "data too short: expecting %u", hdrspace);
 605                         vap->iv_stats.is_rx_tooshort++;
 606                         goto out;               /* XXX */
 607                 }
 608                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 609                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 610                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 611                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 612                                 IEEE80211_DISCARD(vap,
 613                                     IEEE80211_MSG_INPUT, wh, "data",
 614                                     "incorrect dir 0x%x", dir);
 615                         } else {
 616                                 IEEE80211_DISCARD(vap,
 617                                     IEEE80211_MSG_INPUT |
 618                                     IEEE80211_MSG_WDS, wh,
 619                                     "4-address data",
 620                                     "%s", "DWDS not enabled");
 621                         }
 622                         vap->iv_stats.is_rx_wrongdir++;
 623                         goto out;
 624                 }
 625                 /* check if source STA is associated */
 626                 if (ni == vap->iv_bss) {
 627                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 628                             wh, "data", "%s", "unknown src");
 629                         ieee80211_send_error(ni, wh->i_addr2,
 630                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 631                             IEEE80211_REASON_NOT_AUTHED);
 632                         vap->iv_stats.is_rx_notassoc++;
 633                         goto err;
 634                 }
 635                 if (ni->ni_associd == 0) {
 636                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 637                             wh, "data", "%s", "unassoc src");
 638                         IEEE80211_SEND_MGMT(ni,
 639                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 640                             IEEE80211_REASON_NOT_ASSOCED);
 641                         vap->iv_stats.is_rx_notassoc++;
 642                         goto err;
 643                 }
 644
 645                 /*
 646                  * Check for power save state change.
 647                  * XXX out-of-order A-MPDU frames?
 648                  */
 649                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 650                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 651                         vap->iv_node_ps(ni,
 652                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 653                 /*
 654                  * For 4-address packets handle WDS discovery
 655                  * notifications.  Once a WDS link is setup frames
 656                  * are just delivered to the WDS vap (see below).
 657                  */
 658                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 659                         if (!ieee80211_node_is_authorized(ni)) {
 660                                 IEEE80211_DISCARD(vap,
 661                                     IEEE80211_MSG_INPUT |
 662                                     IEEE80211_MSG_WDS, wh,
 663                                     "4-address data",
 664                                     "%s", "unauthorized port");
 665                                 vap->iv_stats.is_rx_unauth++;
 666                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 667                                 goto err;
 668                         }
 669                         ieee80211_dwds_discover(ni, m);
 670                         return type;
 671                 }
 672
 673                 /*
 674                  * Handle A-MPDU re-ordering.  If the frame is to be
 675                  * processed directly then ieee80211_ampdu_reorder
 676                  * will return 0; otherwise it has consumed the mbuf
 677                  * and we should do nothing more with it.
 678                  */
 679                 if ((m->m_flags & M_AMPDU) &&
 680                     ieee80211_ampdu_reorder(ni, m) != 0) {
 681                         m = NULL;
 682                         goto out;
 683                 }
 684         resubmit_ampdu:
 685
 686                 /*
 687                  * Handle privacy requirements.  Note that we
 688                  * must not be preempted from here until after
 689                  * we (potentially) call ieee80211_crypto_demic;
 690                  * otherwise we may violate assumptions in the
 691                  * crypto cipher modules used to do delayed update
 692                  * of replay sequence numbers.
 693                  */
 694                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 695                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 696                                 /*
 697                                  * Discard encrypted frames when privacy is off.
 698                                  */
 699                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 700                                     wh, "WEP", "%s", "PRIVACY off");
 701                                 vap->iv_stats.is_rx_noprivacy++;
 702                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 703                                 goto out;
 704                         }
 705                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 706                         if (key == NULL) {
 707                                 /* NB: stats+msgs handled in crypto_decap */
 708                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 709                                 goto out;
 710                         }
 711                         wh = mtod(m, struct ieee80211_frame *);
 712                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 713                 } else {
 714                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 715                         key = NULL;
 716                 }
 717
 718                 /*
 719                  * Save QoS bits for use below--before we strip the header.
 720                  */
 721                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 722                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 723                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 724                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 725                 } else
 726                         qos = 0;
 727
 728                 /*
 729                  * Next up, any fragmentation.
 730                  */
 731                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 732                         m = ieee80211_defrag(ni, m, hdrspace);
 733                         if (m == NULL) {
 734                                 /* Fragment dropped or frame not complete yet */
 735                                 goto out;
 736                         }
 737                 }
 738                 wh = NULL;              /* no longer valid, catch any uses */
 739
 740                 /*
 741                  * Next strip any MSDU crypto bits.
 742                  */
 743                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 744                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 745                             ni->ni_macaddr, "data", "%s", "demic error");
 746                         vap->iv_stats.is_rx_demicfail++;
 747                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 748                         goto out;
 749                 }
 750                 /* copy to listener after decrypt */
 751                 if (ieee80211_radiotap_active_vap(vap))
 752                         ieee80211_radiotap_rx(vap, m);
 753                 need_tap = 0;
 754                 /*
 755                  * Finally, strip the 802.11 header.
 756                  */
 757                 m = ieee80211_decap(vap, m, hdrspace);
 758                 if (m == NULL) {
 759                         /* XXX mask bit to check for both */
 760                         /* don't count Null data frames as errors */
 761                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 762                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 763                                 goto out;
 764                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 765                             ni->ni_macaddr, "data", "%s", "decap error");
 766                         vap->iv_stats.is_rx_decap++;
 767                         IEEE80211_NODE_STAT(ni, rx_decap);
 768                         goto err;
 769                 }
 770                 eh = mtod(m, struct ether_header *);
 771                 if (!ieee80211_node_is_authorized(ni)) {
 772                         /*
 773                          * Deny any non-PAE frames received prior to
 774                          * authorization.  For open/shared-key
 775                          * authentication the port is mark authorized
 776                          * after authentication completes.  For 802.1x
 777                          * the port is not marked authorized by the
 778                          * authenticator until the handshake has completed.
 779                          */
 780                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 781                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 782                                     eh->ether_shost, "data",
 783                                     "unauthorized port: ether type 0x%x len %u",
 784                                     eh->ether_type, m->m_pkthdr.len);
 785                                 vap->iv_stats.is_rx_unauth++;
 786                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 787                                 goto err;
 788                         }
 789                 } else {
 790                         /*
 791                          * When denying unencrypted frames, discard
 792                          * any non-PAE frames received without encryption.
 793                          */
 794                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 795                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 796                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 797                                 /*
 798                                  * Drop unencrypted frames.
 799                                  */
 800                                 vap->iv_stats.is_rx_unencrypted++;
 801                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 802                                 goto out;
 803                         }
 804                 }
 805                 /* XXX require HT? */
 806                 if (qos & IEEE80211_QOS_AMSDU) {
 807                         m = ieee80211_decap_amsdu(ni, m);
 808                         if (m == NULL)
 809                                 return IEEE80211_FC0_TYPE_DATA;
 810                 } else {
 811 #ifdef IEEE80211_SUPPORT_SUPERG
 812                         m = ieee80211_decap_fastframe(vap, ni, m);
 813                         if (m == NULL)
 814                                 return IEEE80211_FC0_TYPE_DATA;
 815 #endif
 816                 }
 817                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 818                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 819                 else
 820                         hostap_deliver_data(vap, ni, m);
 821                 return IEEE80211_FC0_TYPE_DATA;
 822
 823         case IEEE80211_FC0_TYPE_MGT:
 824                 vap->iv_stats.is_rx_mgmt++;
 825                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 826                 if (dir != IEEE80211_FC1_DIR_NODS) {
 827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 828                             wh, "mgt", "incorrect dir 0x%x", dir);
 829                         vap->iv_stats.is_rx_wrongdir++;
 830                         goto err;
 831                 }
 832                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 833                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 834                             ni->ni_macaddr, "mgt", "too short: len %u",
 835                             m->m_pkthdr.len);
 836                         vap->iv_stats.is_rx_tooshort++;
 837                         goto out;
 838                 }
 839                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 840                         /* ensure return frames are unicast */
 841                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 842                             wh, NULL, "source is multicast: %s",
 843                             ether_sprintf(wh->i_addr2));
 844                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 845                         goto out;
 846                 }
 847 #ifdef IEEE80211_DEBUG
 848                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 849                     ieee80211_msg_dumppkts(vap)) {
 850                         if_printf(ifp, "received %s from %s rssi %d\n",
 851                             ieee80211_mgt_subtype_name[subtype >>
 852                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 853                             ether_sprintf(wh->i_addr2), rssi);
 854                 }
 855 #endif
 856                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 857                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 858                                 /*
 859                                  * Only shared key auth frames with a challenge
 860                                  * should be encrypted, discard all others.
 861                                  */
 862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                                     wh, NULL,
 864                                     "%s", "WEP set but not permitted");
 865                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 866                                 goto out;
 867                         }
 868                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 869                                 /*
 870                                  * Discard encrypted frames when privacy is off.
 871                                  */
 872                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 873                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 874                                 vap->iv_stats.is_rx_noprivacy++;
 875                                 goto out;
 876                         }
 877                         hdrspace = ieee80211_hdrspace(ic, wh);
 878                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 879                         if (key == NULL) {
 880                                 /* NB: stats+msgs handled in crypto_decap */
 881                                 goto out;
 882                         }
 883                         wh = mtod(m, struct ieee80211_frame *);
 884                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 885                 }
 886                 /*
 887                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 888                  * Otherwise iv_recv_mgmt() might pass another packet to
 889                  * radiotap, resulting in out of order packet captures.
 890                  */
 891                 if (ieee80211_radiotap_active_vap(vap))
 892                         ieee80211_radiotap_rx(vap, m);
 893                 need_tap = 0;
 894                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 895                 goto out;
 896
 897         case IEEE80211_FC0_TYPE_CTL:
 898                 vap->iv_stats.is_rx_ctl++;
 899                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 900                 vap->iv_recv_ctl(ni, m, subtype);
 901                 goto out;
 902         default:
 903                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 904                     wh, "bad", "frame type 0x%x", type);
 905                 /* should not come here */
 906                 break;
 907         }
 908 err:
 909         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 910 out:
 911         if (m != NULL) {
 912                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 913                         ieee80211_radiotap_rx(vap, m);
 914                 m_freem(m);
 915         }
 916         return type;
 917 }
 918
 919 static void
 920 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 921     int rssi, int nf, uint16_t seq, uint16_t status)
 922 {
 923         struct ieee80211vap *vap = ni->ni_vap;
 924
 925         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 926
 927         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 928                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 929                     ni->ni_macaddr, "open auth",
 930                     "bad sta auth mode %u", ni->ni_authmode);
 931                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 932                 /*
 933                  * Clear any challenge text that may be there if
 934                  * a previous shared key auth failed and then an
 935                  * open auth is attempted.
 936                  */
 937                 if (ni->ni_challenge != NULL) {
 938                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
 939                         ni->ni_challenge = NULL;
 940                 }
 941                 /* XXX hack to workaround calling convention */
 942                 ieee80211_send_error(ni, wh->i_addr2,
 943                     IEEE80211_FC0_SUBTYPE_AUTH,
 944                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 945                 return;
 946         }
 947         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 948                 vap->iv_stats.is_rx_bad_auth++;
 949                 return;
 950         }
 951         /* always accept open authentication requests */
 952         if (ni == vap->iv_bss) {
 953                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 954                 if (ni == NULL)
 955                         return;
 956         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 957                 (void) ieee80211_ref_node(ni);
 958         /*
 959          * Mark the node as referenced to reflect that it's
 960          * reference count has been bumped to insure it remains
 961          * after the transaction completes.
 962          */
 963         ni->ni_flags |= IEEE80211_NODE_AREF;
 964         /*
 965          * Mark the node as requiring a valid association id
 966          * before outbound traffic is permitted.
 967          */
 968         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 969
 970         if (vap->iv_acl != NULL &&
 971             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 972                 /*
 973                  * When the ACL policy is set to RADIUS we defer the
 974                  * authorization to a user agent.  Dispatch an event,
 975                  * a subsequent MLME call will decide the fate of the
 976                  * station.  If the user agent is not present then the
 977                  * node will be reclaimed due to inactivity.
 978                  */
 979                 IEEE80211_NOTE_MAC(vap,
 980                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 981                     "%s", "station authentication defered (radius acl)");
 982                 ieee80211_notify_node_auth(ni);
 983         } else {
 984                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 985                 IEEE80211_NOTE_MAC(vap,
 986                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 987                     "%s", "station authenticated (open)");
 988                 /*
 989                  * When 802.1x is not in use mark the port
 990                  * authorized at this point so traffic can flow.
 991                  */
 992                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 993                         ieee80211_node_authorize(ni);
 994         }
 995 }
 996
 997 static void
 998 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 999     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1000     uint16_t seq, uint16_t status)
1001 {
1002         struct ieee80211vap *vap = ni->ni_vap;
1003         uint8_t *challenge;
1004         int allocbs, estatus;
1005
1006         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1007
1008         /*
1009          * NB: this can happen as we allow pre-shared key
1010          * authentication to be enabled w/o wep being turned
1011          * on so that configuration of these can be done
1012          * in any order.  It may be better to enforce the
1013          * ordering in which case this check would just be
1014          * for sanity/consistency.
1015          */
1016         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1017                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1018                     ni->ni_macaddr, "shared key auth",
1019                     "%s", " PRIVACY is disabled");
1020                 estatus = IEEE80211_STATUS_ALG;
1021                 goto bad;
1022         }
1023         /*
1024          * Pre-shared key authentication is evil; accept
1025          * it only if explicitly configured (it is supported
1026          * mainly for compatibility with clients like Mac OS X).
1027          */
1028         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1029             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1030                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1031                     ni->ni_macaddr, "shared key auth",
1032                     "bad sta auth mode %u", ni->ni_authmode);
1033                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1034                 estatus = IEEE80211_STATUS_ALG;
1035                 goto bad;
1036         }
1037
1038         challenge = NULL;
1039         if (frm + 1 < efrm) {
1040                 if ((frm[1] + 2) > (efrm - frm)) {
1041                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1042                             ni->ni_macaddr, "shared key auth",
1043                             "ie %d/%d too long",
1044                             frm[0], (frm[1] + 2) - (efrm - frm));
1045                         vap->iv_stats.is_rx_bad_auth++;
1046                         estatus = IEEE80211_STATUS_CHALLENGE;
1047                         goto bad;
1048                 }
1049                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1050                         challenge = frm;
1051                 frm += frm[1] + 2;
1052         }
1053         switch (seq) {
1054         case IEEE80211_AUTH_SHARED_CHALLENGE:
1055         case IEEE80211_AUTH_SHARED_RESPONSE:
1056                 if (challenge == NULL) {
1057                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1058                             ni->ni_macaddr, "shared key auth",
1059                             "%s", "no challenge");
1060                         vap->iv_stats.is_rx_bad_auth++;
1061                         estatus = IEEE80211_STATUS_CHALLENGE;
1062                         goto bad;
1063                 }
1064                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1065                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1066                             ni->ni_macaddr, "shared key auth",
1067                             "bad challenge len %d", challenge[1]);
1068                         vap->iv_stats.is_rx_bad_auth++;
1069                         estatus = IEEE80211_STATUS_CHALLENGE;
1070                         goto bad;
1071                 }
1072         default:
1073                 break;
1074         }
1075         switch (seq) {
1076         case IEEE80211_AUTH_SHARED_REQUEST:
1077                 if (ni == vap->iv_bss) {
1078                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1079                         if (ni == NULL) {
1080                                 /* NB: no way to return an error */
1081                                 return;
1082                         }
1083                         allocbs = 1;
1084                 } else {
1085                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1086                                 (void) ieee80211_ref_node(ni);
1087                         allocbs = 0;
1088                 }
1089                 /*
1090                  * Mark the node as referenced to reflect that it's
1091                  * reference count has been bumped to insure it remains
1092                  * after the transaction completes.
1093                  */
1094                 ni->ni_flags |= IEEE80211_NODE_AREF;
1095                 /*
1096                  * Mark the node as requiring a valid associatio id
1097                  * before outbound traffic is permitted.
1098                  */
1099                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1100                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1101                 ni->ni_noise = nf;
1102                 if (!ieee80211_alloc_challenge(ni)) {
1103                         /* NB: don't return error so they rexmit */
1104                         return;
1105                 }
1106                 get_random_bytes(ni->ni_challenge,
1107                         IEEE80211_CHALLENGE_LEN);
1108                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1109                     ni, "shared key %sauth request", allocbs ? "" : "re");
1110                 /*
1111                  * When the ACL policy is set to RADIUS we defer the
1112                  * authorization to a user agent.  Dispatch an event,
1113                  * a subsequent MLME call will decide the fate of the
1114                  * station.  If the user agent is not present then the
1115                  * node will be reclaimed due to inactivity.
1116                  */
1117                 if (vap->iv_acl != NULL &&
1118                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1119                         IEEE80211_NOTE_MAC(vap,
1120                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1121                             ni->ni_macaddr,
1122                             "%s", "station authentication defered (radius acl)");
1123                         ieee80211_notify_node_auth(ni);
1124                         return;
1125                 }
1126                 break;
1127         case IEEE80211_AUTH_SHARED_RESPONSE:
1128                 if (ni == vap->iv_bss) {
1129                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1130                             ni->ni_macaddr, "shared key response",
1131                             "%s", "unknown station");
1132                         /* NB: don't send a response */
1133                         return;
1134                 }
1135                 if (ni->ni_challenge == NULL) {
1136                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1137                             ni->ni_macaddr, "shared key response",
1138                             "%s", "no challenge recorded");
1139                         vap->iv_stats.is_rx_bad_auth++;
1140                         estatus = IEEE80211_STATUS_CHALLENGE;
1141                         goto bad;
1142                 }
1143                 if (memcmp(ni->ni_challenge, &challenge[2],
1144                            challenge[1]) != 0) {
1145                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1146                             ni->ni_macaddr, "shared key response",
1147                             "%s", "challenge mismatch");
1148                         vap->iv_stats.is_rx_auth_fail++;
1149                         estatus = IEEE80211_STATUS_CHALLENGE;
1150                         goto bad;
1151                 }
1152                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1153                     ni, "%s", "station authenticated (shared key)");
1154                 ieee80211_node_authorize(ni);
1155                 break;
1156         default:
1157                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1158                     ni->ni_macaddr, "shared key auth",
1159                     "bad seq %d", seq);
1160                 vap->iv_stats.is_rx_bad_auth++;
1161                 estatus = IEEE80211_STATUS_SEQUENCE;
1162                 goto bad;
1163         }
1164         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1165         return;
1166 bad:
1167         /*
1168          * Send an error response; but only when operating as an AP.
1169          */
1170         /* XXX hack to workaround calling convention */
1171         ieee80211_send_error(ni, wh->i_addr2,
1172             IEEE80211_FC0_SUBTYPE_AUTH,
1173             (seq + 1) | (estatus<<16));
1174 }
1175
1176 /*
1177  * Convert a WPA cipher selector OUI to an internal
1178  * cipher algorithm.  Where appropriate we also
1179  * record any key length.
1180  */
1181 static int
1182 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1183 {
1184 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1185         uint32_t w = LE_READ_4(sel);
1186
1187         switch (w) {
1188         case WPA_SEL(WPA_CSE_NULL):
1189                 return IEEE80211_CIPHER_NONE;
1190         case WPA_SEL(WPA_CSE_WEP40):
1191                 if (keylen)
1192                         *keylen = 40 / NBBY;
1193                 return IEEE80211_CIPHER_WEP;
1194         case WPA_SEL(WPA_CSE_WEP104):
1195                 if (keylen)
1196                         *keylen = 104 / NBBY;
1197                 return IEEE80211_CIPHER_WEP;
1198         case WPA_SEL(WPA_CSE_TKIP):
1199                 return IEEE80211_CIPHER_TKIP;
1200         case WPA_SEL(WPA_CSE_CCMP):
1201                 return IEEE80211_CIPHER_AES_CCM;
1202         }
1203         return 32;              /* NB: so 1<< is discarded */
1204 #undef WPA_SEL
1205 }
1206
1207 /*
1208  * Convert a WPA key management/authentication algorithm
1209  * to an internal code.
1210  */
1211 static int
1212 wpa_keymgmt(const uint8_t *sel)
1213 {
1214 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1215         uint32_t w = LE_READ_4(sel);
1216
1217         switch (w) {
1218         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1219                 return WPA_ASE_8021X_UNSPEC;
1220         case WPA_SEL(WPA_ASE_8021X_PSK):
1221                 return WPA_ASE_8021X_PSK;
1222         case WPA_SEL(WPA_ASE_NONE):
1223                 return WPA_ASE_NONE;
1224         }
1225         return 0;               /* NB: so is discarded */
1226 #undef WPA_SEL
1227 }
1228
1229 /*
1230  * Parse a WPA information element to collect parameters.
1231  * Note that we do not validate security parameters; that
1232  * is handled by the authenticator; the parsing done here
1233  * is just for internal use in making operational decisions.
1234  */
1235 static int
1236 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1237         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1238 {
1239         uint8_t len = frm[1];
1240         uint32_t w;
1241         int n;
1242
1243         /*
1244          * Check the length once for fixed parts: OUI, type,
1245          * version, mcast cipher, and 2 selector counts.
1246          * Other, variable-length data, must be checked separately.
1247          */
1248         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1249                 IEEE80211_DISCARD_IE(vap,
1250                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1251                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1252                 return IEEE80211_REASON_IE_INVALID;
1253         }
1254         if (len < 14) {
1255                 IEEE80211_DISCARD_IE(vap,
1256                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1257                     wh, "WPA", "too short, len %u", len);
1258                 return IEEE80211_REASON_IE_INVALID;
1259         }
1260         frm += 6, len -= 4;             /* NB: len is payload only */
1261         /* NB: iswpaoui already validated the OUI and type */
1262         w = LE_READ_2(frm);
1263         if (w != WPA_VERSION) {
1264                 IEEE80211_DISCARD_IE(vap,
1265                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1266                     wh, "WPA", "bad version %u", w);
1267                 return IEEE80211_REASON_IE_INVALID;
1268         }
1269         frm += 2, len -= 2;
1270
1271         memset(rsn, 0, sizeof(*rsn));
1272
1273         /* multicast/group cipher */
1274         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1275         frm += 4, len -= 4;
1276
1277         /* unicast ciphers */
1278         n = LE_READ_2(frm);
1279         frm += 2, len -= 2;
1280         if (len < n*4+2) {
1281                 IEEE80211_DISCARD_IE(vap,
1282                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1283                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1284                     len, n);
1285                 return IEEE80211_REASON_IE_INVALID;
1286         }
1287         w = 0;
1288         for (; n > 0; n--) {
1289                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1290                 frm += 4, len -= 4;
1291         }
1292         if (w & (1<<IEEE80211_CIPHER_TKIP))
1293                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1294         else
1295                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1296
1297         /* key management algorithms */
1298         n = LE_READ_2(frm);
1299         frm += 2, len -= 2;
1300         if (len < n*4) {
1301                 IEEE80211_DISCARD_IE(vap,
1302                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1303                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1304                     len, n);
1305                 return IEEE80211_REASON_IE_INVALID;
1306         }
1307         w = 0;
1308         for (; n > 0; n--) {
1309                 w |= wpa_keymgmt(frm);
1310                 frm += 4, len -= 4;
1311         }
1312         if (w & WPA_ASE_8021X_UNSPEC)
1313                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1314         else
1315                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1316
1317         if (len > 2)            /* optional capabilities */
1318                 rsn->rsn_caps = LE_READ_2(frm);
1319
1320         return 0;
1321 }
1322
1323 /*
1324  * Convert an RSN cipher selector OUI to an internal
1325  * cipher algorithm.  Where appropriate we also
1326  * record any key length.
1327  */
1328 static int
1329 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1330 {
1331 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1332         uint32_t w = LE_READ_4(sel);
1333
1334         switch (w) {
1335         case RSN_SEL(RSN_CSE_NULL):
1336                 return IEEE80211_CIPHER_NONE;
1337         case RSN_SEL(RSN_CSE_WEP40):
1338                 if (keylen)
1339                         *keylen = 40 / NBBY;
1340                 return IEEE80211_CIPHER_WEP;
1341         case RSN_SEL(RSN_CSE_WEP104):
1342                 if (keylen)
1343                         *keylen = 104 / NBBY;
1344                 return IEEE80211_CIPHER_WEP;
1345         case RSN_SEL(RSN_CSE_TKIP):
1346                 return IEEE80211_CIPHER_TKIP;
1347         case RSN_SEL(RSN_CSE_CCMP):
1348                 return IEEE80211_CIPHER_AES_CCM;
1349         case RSN_SEL(RSN_CSE_WRAP):
1350                 return IEEE80211_CIPHER_AES_OCB;
1351         }
1352         return 32;              /* NB: so 1<< is discarded */
1353 #undef WPA_SEL
1354 }
1355
1356 /*
1357  * Convert an RSN key management/authentication algorithm
1358  * to an internal code.
1359  */
1360 static int
1361 rsn_keymgmt(const uint8_t *sel)
1362 {
1363 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1364         uint32_t w = LE_READ_4(sel);
1365
1366         switch (w) {
1367         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1368                 return RSN_ASE_8021X_UNSPEC;
1369         case RSN_SEL(RSN_ASE_8021X_PSK):
1370                 return RSN_ASE_8021X_PSK;
1371         case RSN_SEL(RSN_ASE_NONE):
1372                 return RSN_ASE_NONE;
1373         }
1374         return 0;               /* NB: so is discarded */
1375 #undef RSN_SEL
1376 }
1377
1378 /*
1379  * Parse a WPA/RSN information element to collect parameters
1380  * and validate the parameters against what has been
1381  * configured for the system.
1382  */
1383 static int
1384 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1385         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1386 {
1387         uint8_t len = frm[1];
1388         uint32_t w;
1389         int n;
1390
1391         /*
1392          * Check the length once for fixed parts:
1393          * version, mcast cipher, and 2 selector counts.
1394          * Other, variable-length data, must be checked separately.
1395          */
1396         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1397                 IEEE80211_DISCARD_IE(vap,
1398                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1399                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1400                 return IEEE80211_REASON_IE_INVALID;
1401         }
1402         if (len < 10) {
1403                 IEEE80211_DISCARD_IE(vap,
1404                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1405                     wh, "RSN", "too short, len %u", len);
1406                 return IEEE80211_REASON_IE_INVALID;
1407         }
1408         frm += 2;
1409         w = LE_READ_2(frm);
1410         if (w != RSN_VERSION) {
1411                 IEEE80211_DISCARD_IE(vap,
1412                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1413                     wh, "RSN", "bad version %u", w);
1414                 return IEEE80211_REASON_IE_INVALID;
1415         }
1416         frm += 2, len -= 2;
1417
1418         memset(rsn, 0, sizeof(*rsn));
1419
1420         /* multicast/group cipher */
1421         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1422         frm += 4, len -= 4;
1423
1424         /* unicast ciphers */
1425         n = LE_READ_2(frm);
1426         frm += 2, len -= 2;
1427         if (len < n*4+2) {
1428                 IEEE80211_DISCARD_IE(vap,
1429                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1430                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1431                     len, n);
1432                 return IEEE80211_REASON_IE_INVALID;
1433         }
1434         w = 0;
1435         for (; n > 0; n--) {
1436                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1437                 frm += 4, len -= 4;
1438         }
1439         if (w & (1<<IEEE80211_CIPHER_TKIP))
1440                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1441         else
1442                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1443
1444         /* key management algorithms */
1445         n = LE_READ_2(frm);
1446         frm += 2, len -= 2;
1447         if (len < n*4) {
1448                 IEEE80211_DISCARD_IE(vap,
1449                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1450                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1451                     len, n);
1452                 return IEEE80211_REASON_IE_INVALID;
1453         }
1454         w = 0;
1455         for (; n > 0; n--) {
1456                 w |= rsn_keymgmt(frm);
1457                 frm += 4, len -= 4;
1458         }
1459         if (w & RSN_ASE_8021X_UNSPEC)
1460                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1461         else
1462                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1463
1464         /* optional RSN capabilities */
1465         if (len > 2)
1466                 rsn->rsn_caps = LE_READ_2(frm);
1467         /* XXXPMKID */
1468
1469         return 0;
1470 }
1471
1472 /*
1473  * WPA/802.11i assocation request processing.
1474  */
1475 static int
1476 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1477         const struct ieee80211_frame *wh, const uint8_t *wpa,
1478         const uint8_t *rsn, uint16_t capinfo)
1479 {
1480         struct ieee80211vap *vap = ni->ni_vap;
1481         uint8_t reason;
1482         int badwparsn;
1483
1484         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1485         if (wpa == NULL && rsn == NULL) {
1486                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1487                         /*
1488                          * W-Fi Protected Setup (WPS) permits
1489                          * clients to associate and pass EAPOL frames
1490                          * to establish initial credentials.
1491                          */
1492                         ni->ni_flags |= IEEE80211_NODE_WPS;
1493                         return 1;
1494                 }
1495                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1496                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1497                         /*
1498                          * Transitional Security Network.  Permits clients
1499                          * to associate and use WEP while WPA is configured.
1500                          */
1501                         ni->ni_flags |= IEEE80211_NODE_TSN;
1502                         return 1;
1503                 }
1504                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1505                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1506                 vap->iv_stats.is_rx_assoc_badwpaie++;
1507                 reason = IEEE80211_REASON_IE_INVALID;
1508                 goto bad;
1509         }
1510         /* assert right association security credentials */
1511         badwparsn = 0;                  /* NB: to silence compiler */
1512         switch (vap->iv_flags & IEEE80211_F_WPA) {
1513         case IEEE80211_F_WPA1:
1514                 badwparsn = (wpa == NULL);
1515                 break;
1516         case IEEE80211_F_WPA2:
1517                 badwparsn = (rsn == NULL);
1518                 break;
1519         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1520                 badwparsn = (wpa == NULL && rsn == NULL);
1521                 break;
1522         }
1523         if (badwparsn) {
1524                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1525                     wh, NULL,
1526                     "%s", "missing WPA/RSN IE in association request");
1527                 vap->iv_stats.is_rx_assoc_badwpaie++;
1528                 reason = IEEE80211_REASON_IE_INVALID;
1529                 goto bad;
1530         }
1531         /*
1532          * Parse WPA/RSN information element.
1533          */
1534         if (wpa != NULL)
1535                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1536         else
1537                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1538         if (reason != 0) {
1539                 /* XXX distinguish WPA/RSN? */
1540                 vap->iv_stats.is_rx_assoc_badwpaie++;
1541                 goto bad;
1542         }
1543         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1544             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1545             wpa != NULL ? "WPA" : "RSN",
1546             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1547             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1548             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1549
1550         return 1;
1551 bad:
1552         ieee80211_node_deauth(ni, reason);
1553         return 0;
1554 }
1555
1556 /* XXX find a better place for definition */
1557 struct l2_update_frame {
1558         struct ether_header eh;
1559         uint8_t dsap;
1560         uint8_t ssap;
1561         uint8_t control;
1562         uint8_t xid[3];
1563 }  __packed;
1564
1565 /*
1566  * Deliver a TGf L2UF frame on behalf of a station.
1567  * This primes any bridge when the station is roaming
1568  * between ap's on the same wired network.
1569  */
1570 static void
1571 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1572 {
1573         struct ieee80211vap *vap = ni->ni_vap;
1574         struct ifnet *ifp = vap->iv_ifp;
1575         struct mbuf *m;
1576         struct l2_update_frame *l2uf;
1577         struct ether_header *eh;
1578
1579         m = m_gethdr(M_NOWAIT, MT_DATA);
1580         if (m == NULL) {
1581                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1582                     "%s", "no mbuf for l2uf frame");
1583                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1584                 return;
1585         }
1586         l2uf = mtod(m, struct l2_update_frame *);
1587         eh = &l2uf->eh;
1588         /* dst: Broadcast address */
1589         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1590         /* src: associated STA */
1591         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1592         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1593
1594         l2uf->dsap = 0;
1595         l2uf->ssap = 0;
1596         l2uf->control = 0xf5;
1597         l2uf->xid[0] = 0x81;
1598         l2uf->xid[1] = 0x80;
1599         l2uf->xid[2] = 0x00;
1600
1601         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1602         hostap_deliver_data(vap, ni, m);
1603 }
1604
1605 static void
1606 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1607         int reassoc, int resp, const char *tag, int rate)
1608 {
1609         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1610             "deny %s request, %s rate set mismatch, rate/MCS %d",
1611             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1612         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1613         ieee80211_node_leave(ni);
1614 }
1615
1616 static void
1617 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1618         int reassoc, int resp, const char *tag, int capinfo)
1619 {
1620         struct ieee80211vap *vap = ni->ni_vap;
1621
1622         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1623             "deny %s request, %s mismatch 0x%x",
1624             reassoc ? "reassoc" : "assoc", tag, capinfo);
1625         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1626         ieee80211_node_leave(ni);
1627         vap->iv_stats.is_rx_assoc_capmismatch++;
1628 }
1629
1630 static void
1631 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1632         int reassoc, int resp)
1633 {
1634         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1635             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1636         /* XXX no better code */
1637         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1638         ieee80211_node_leave(ni);
1639 }
1640
1641 static void
1642 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1643         int algo, int seq, int status)
1644 {
1645         struct ieee80211vap *vap = ni->ni_vap;
1646
1647         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1648             wh, NULL, "unsupported alg %d", algo);
1649         vap->iv_stats.is_rx_auth_unsupported++;
1650         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1651             seq | (status << 16));
1652 }
1653
1654 static __inline int
1655 ishtmixed(const uint8_t *ie)
1656 {
1657         const struct ieee80211_ie_htinfo *ht =
1658             (const struct ieee80211_ie_htinfo *) ie;
1659         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1660             IEEE80211_HTINFO_OPMODE_MIXED;
1661 }
1662
1663 static int
1664 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1665 {
1666         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1667         int i;
1668
1669         /* NB: the 11b clients we care about will not have xrates */
1670         if (xrates != NULL || rates == NULL)
1671                 return 0;
1672         for (i = 0; i < rates[1]; i++) {
1673                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1674                 if (r > 2*11 || ((1<<r) & brates) == 0)
1675                         return 0;
1676         }
1677         return 1;
1678 }
1679
1680 static void
1681 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1682         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1683 {
1684         struct ieee80211vap *vap = ni->ni_vap;
1685         struct ieee80211com *ic = ni->ni_ic;
1686         struct ieee80211_frame *wh;
1687         uint8_t *frm, *efrm, *sfrm;
1688         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1689         int reassoc, resp;
1690         uint8_t rate;
1691
1692         wh = mtod(m0, struct ieee80211_frame *);
1693         frm = (uint8_t *)&wh[1];
1694         efrm = mtod(m0, uint8_t *) + m0->m_len;
1695         switch (subtype) {
1696         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1697         case IEEE80211_FC0_SUBTYPE_BEACON: {
1698                 struct ieee80211_scanparams scan;
1699                 /*
1700                  * We process beacon/probe response frames when scanning;
1701                  * otherwise we check beacon frames for overlapping non-ERP
1702                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1703                  */
1704                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1705                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1706                         vap->iv_stats.is_rx_mgtdiscard++;
1707                         return;
1708                 }
1709                 /* NB: accept off-channel frames */
1710                 /* XXX TODO: use rxstatus to determine off-channel details */
1711                 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1712                         return;
1713                 /*
1714                  * Count frame now that we know it's to be processed.
1715                  */
1716                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1717                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1718                         IEEE80211_NODE_STAT(ni, rx_beacons);
1719                 } else
1720                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1721                 /*
1722                  * If scanning, just pass information to the scan module.
1723                  */
1724                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1725                         if (scan.status == 0 &&         /* NB: on channel */
1726                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1727                                 /*
1728                                  * Actively scanning a channel marked passive;
1729                                  * send a probe request now that we know there
1730                                  * is 802.11 traffic present.
1731                                  *
1732                                  * XXX check if the beacon we recv'd gives
1733                                  * us what we need and suppress the probe req
1734                                  */
1735                                 ieee80211_probe_curchan(vap, 1);
1736                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1737                         }
1738                         ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1739                             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                  * Consult the ACL policy module if setup.
1804                  */
1805                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1806                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1807                             wh, NULL, "%s", "disallowed by ACL");
1808                         vap->iv_stats.is_rx_acl++;
1809                         return;
1810                 }
1811                 /*
1812                  * prreq frame format
1813                  *      [tlv] ssid
1814                  *      [tlv] supported rates
1815                  *      [tlv] extended supported rates
1816                  */
1817                 ssid = rates = xrates = NULL;
1818                 sfrm = frm;
1819                 while (efrm - frm > 1) {
1820                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1821                         switch (*frm) {
1822                         case IEEE80211_ELEMID_SSID:
1823                                 ssid = frm;
1824                                 break;
1825                         case IEEE80211_ELEMID_RATES:
1826                                 rates = frm;
1827                                 break;
1828                         case IEEE80211_ELEMID_XRATES:
1829                                 xrates = frm;
1830                                 break;
1831                         }
1832                         frm += frm[1] + 2;
1833                 }
1834                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1835                 if (xrates != NULL)
1836                         IEEE80211_VERIFY_ELEMENT(xrates,
1837                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1838                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1839                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1840                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1841                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1842                             wh, NULL,
1843                             "%s", "no ssid with ssid suppression enabled");
1844                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1845                         return;
1846                 }
1847
1848                 /* XXX find a better class or define it's own */
1849                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1850                     "%s", "recv probe req");
1851                 /*
1852                  * Some legacy 11b clients cannot hack a complete
1853                  * probe response frame.  When the request includes
1854                  * only a bare-bones rate set, communicate this to
1855                  * the transmit side.
1856                  */
1857                 ieee80211_send_proberesp(vap, wh->i_addr2,
1858                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1859                 break;
1860
1861         case IEEE80211_FC0_SUBTYPE_AUTH: {
1862                 uint16_t algo, seq, status;
1863
1864                 if (vap->iv_state != IEEE80211_S_RUN) {
1865                         vap->iv_stats.is_rx_mgtdiscard++;
1866                         return;
1867                 }
1868                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1869                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1870                             wh, NULL, "%s", "wrong bssid");
1871                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1872                         return;
1873                 }
1874                 /*
1875                  * auth frame format
1876                  *      [2] algorithm
1877                  *      [2] sequence
1878                  *      [2] status
1879                  *      [tlv*] challenge
1880                  */
1881                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1882                 algo   = le16toh(*(uint16_t *)frm);
1883                 seq    = le16toh(*(uint16_t *)(frm + 2));
1884                 status = le16toh(*(uint16_t *)(frm + 4));
1885                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1886                     "recv auth frame with algorithm %d seq %d", algo, seq);
1887                 /*
1888                  * Consult the ACL policy module if setup.
1889                  */
1890                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1891                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1892                             wh, NULL, "%s", "disallowed by ACL");
1893                         vap->iv_stats.is_rx_acl++;
1894                         ieee80211_send_error(ni, wh->i_addr2,
1895                             IEEE80211_FC0_SUBTYPE_AUTH,
1896                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1897                         return;
1898                 }
1899                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1900                         IEEE80211_DISCARD(vap,
1901                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1902                             wh, NULL, "%s", "TKIP countermeasures enabled");
1903                         vap->iv_stats.is_rx_auth_countermeasures++;
1904                         ieee80211_send_error(ni, wh->i_addr2,
1905                                 IEEE80211_FC0_SUBTYPE_AUTH,
1906                                 IEEE80211_REASON_MIC_FAILURE);
1907                         return;
1908                 }
1909                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1910                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1911                             seq, status);
1912                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1913                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1914                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1915                         authalgreject(ni, wh, algo,
1916                             seq+1, IEEE80211_STATUS_ALG);
1917                         return;
1918                 } else {
1919                         /*
1920                          * We assume that an unknown algorithm is the result
1921                          * of a decryption failure on a shared key auth frame;
1922                          * return a status code appropriate for that instead
1923                          * of IEEE80211_STATUS_ALG.
1924                          *
1925                          * NB: a seq# of 4 is intentional; the decrypted
1926                          *     frame likely has a bogus seq value.
1927                          */
1928                         authalgreject(ni, wh, algo,
1929                             4, IEEE80211_STATUS_CHALLENGE);
1930                         return;
1931                 }
1932                 break;
1933         }
1934
1935         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1936         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1937                 uint16_t capinfo, lintval;
1938                 struct ieee80211_rsnparms rsnparms;
1939
1940                 if (vap->iv_state != IEEE80211_S_RUN) {
1941                         vap->iv_stats.is_rx_mgtdiscard++;
1942                         return;
1943                 }
1944                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1945                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1946                             wh, NULL, "%s", "wrong bssid");
1947                         vap->iv_stats.is_rx_assoc_bss++;
1948                         return;
1949                 }
1950                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1951                         reassoc = 1;
1952                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1953                 } else {
1954                         reassoc = 0;
1955                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1956                 }
1957                 if (ni == vap->iv_bss) {
1958                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1959                             "deny %s request, sta not authenticated",
1960                             reassoc ? "reassoc" : "assoc");
1961                         ieee80211_send_error(ni, wh->i_addr2,
1962                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1963                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1964                         vap->iv_stats.is_rx_assoc_notauth++;
1965                         return;
1966                 }
1967
1968                 /*
1969                  * asreq frame format
1970                  *      [2] capability information
1971                  *      [2] listen interval
1972                  *      [6*] current AP address (reassoc only)
1973                  *      [tlv] ssid
1974                  *      [tlv] supported rates
1975                  *      [tlv] extended supported rates
1976                  *      [tlv] WPA or RSN
1977                  *      [tlv] HT capabilities
1978                  *      [tlv] Atheros capabilities
1979                  */
1980                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1981                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1982                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1983                 if (reassoc)
1984                         frm += 6;       /* ignore current AP info */
1985                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1986                 sfrm = frm;
1987                 while (efrm - frm > 1) {
1988                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1989                         switch (*frm) {
1990                         case IEEE80211_ELEMID_SSID:
1991                                 ssid = frm;
1992                                 break;
1993                         case IEEE80211_ELEMID_RATES:
1994                                 rates = frm;
1995                                 break;
1996                         case IEEE80211_ELEMID_XRATES:
1997                                 xrates = frm;
1998                                 break;
1999                         case IEEE80211_ELEMID_RSN:
2000                                 rsn = frm;
2001                                 break;
2002                         case IEEE80211_ELEMID_HTCAP:
2003                                 htcap = frm;
2004                                 break;
2005                         case IEEE80211_ELEMID_VENDOR:
2006                                 if (iswpaoui(frm))
2007                                         wpa = frm;
2008                                 else if (iswmeinfo(frm))
2009                                         wme = frm;
2010 #ifdef IEEE80211_SUPPORT_SUPERG
2011                                 else if (isatherosoui(frm))
2012                                         ath = frm;
2013 #endif
2014                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2015                                         if (ishtcapoui(frm) && htcap == NULL)
2016                                                 htcap = frm;
2017                                 }
2018                                 break;
2019                         }
2020                         frm += frm[1] + 2;
2021                 }
2022                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2023                 if (xrates != NULL)
2024                         IEEE80211_VERIFY_ELEMENT(xrates,
2025                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2026                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2027                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2028                 if (htcap != NULL) {
2029                         IEEE80211_VERIFY_LENGTH(htcap[1],
2030                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2031                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2032                                  sizeof(struct ieee80211_ie_htcap)-2,
2033                              return);           /* XXX just NULL out? */
2034                 }
2035
2036                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2037                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2038                         return;
2039                 /* discard challenge after association */
2040                 if (ni->ni_challenge != NULL) {
2041                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2042                         ni->ni_challenge = NULL;
2043                 }
2044                 /* NB: 802.11 spec says to ignore station's privacy bit */
2045                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2046                         capinfomismatch(ni, wh, reassoc, resp,
2047                             "capability", capinfo);
2048                         return;
2049                 }
2050                 /*
2051                  * Disallow re-associate w/ invalid slot time setting.
2052                  */
2053                 if (ni->ni_associd != 0 &&
2054                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2055                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2056                         capinfomismatch(ni, wh, reassoc, resp,
2057                             "slot time", capinfo);
2058                         return;
2059                 }
2060                 rate = ieee80211_setup_rates(ni, rates, xrates,
2061                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2062                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2063                 if (rate & IEEE80211_RATE_BASIC) {
2064                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2065                         vap->iv_stats.is_rx_assoc_norate++;
2066                         return;
2067                 }
2068                 /*
2069                  * If constrained to 11g-only stations reject an
2070                  * 11b-only station.  We cheat a bit here by looking
2071                  * at the max negotiated xmit rate and assuming anyone
2072                  * with a best rate <24Mb/s is an 11b station.
2073                  */
2074                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2075                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2076                         vap->iv_stats.is_rx_assoc_norate++;
2077                         return;
2078                 }
2079                 /*
2080                  * Do HT rate set handling and setup HT node state.
2081                  */
2082                 ni->ni_chan = vap->iv_bss->ni_chan;
2083                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2084                         rate = ieee80211_setup_htrates(ni, htcap,
2085                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2086                                 IEEE80211_F_DOBRS);
2087                         if (rate & IEEE80211_RATE_BASIC) {
2088                                 ratesetmismatch(ni, wh, reassoc, resp,
2089                                     "HT", rate);
2090                                 vap->iv_stats.is_ht_assoc_norate++;
2091                                 return;
2092                         }
2093                         ieee80211_ht_node_init(ni);
2094                         ieee80211_ht_updatehtcap(ni, htcap);
2095                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2096                         ieee80211_ht_node_cleanup(ni);
2097 #ifdef IEEE80211_SUPPORT_SUPERG
2098                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2099                         ieee80211_ff_node_cleanup(ni);
2100 #endif
2101                 /*
2102                  * Allow AMPDU operation only with unencrypted traffic
2103                  * or AES-CCM; the 11n spec only specifies these ciphers
2104                  * so permitting any others is undefined and can lead
2105                  * to interoperability problems.
2106                  */
2107                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2108                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2109                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2110                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2111                         IEEE80211_NOTE(vap,
2112                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2113                             "disallow HT use because WEP or TKIP requested, "
2114                             "capinfo 0x%x ucastcipher %d", capinfo,
2115                             rsnparms.rsn_ucastcipher);
2116                         ieee80211_ht_node_cleanup(ni);
2117                         vap->iv_stats.is_ht_assoc_downgrade++;
2118                 }
2119                 /*
2120                  * If constrained to 11n-only stations reject legacy stations.
2121                  */
2122                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2123                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2124                         htcapmismatch(ni, wh, reassoc, resp);
2125                         vap->iv_stats.is_ht_assoc_nohtcap++;
2126                         return;
2127                 }
2128                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2129                 ni->ni_noise = nf;
2130                 ni->ni_intval = lintval;
2131                 ni->ni_capinfo = capinfo;
2132                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2133                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2134                 /*
2135                  * Store the IEs.
2136                  * XXX maybe better to just expand
2137                  */
2138                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2139 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2140                         if (wpa != NULL)
2141                                 setie(wpa_ie, wpa - sfrm);
2142                         if (rsn != NULL)
2143                                 setie(rsn_ie, rsn - sfrm);
2144                         if (htcap != NULL)
2145                                 setie(htcap_ie, htcap - sfrm);
2146                         if (wme != NULL) {
2147                                 setie(wme_ie, wme - sfrm);
2148                                 /*
2149                                  * Mark node as capable of QoS.
2150                                  */
2151                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2152                         } else
2153                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2154 #ifdef IEEE80211_SUPPORT_SUPERG
2155                         if (ath != NULL) {
2156                                 setie(ath_ie, ath - sfrm);
2157                                 /*
2158                                  * Parse ATH station parameters.
2159                                  */
2160                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2161                         } else
2162 #endif
2163                                 ni->ni_ath_flags = 0;
2164 #undef setie
2165                 } else {
2166                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2167                         ni->ni_ath_flags = 0;
2168                 }
2169                 ieee80211_node_join(ni, resp);
2170                 ieee80211_deliver_l2uf(ni);
2171                 break;
2172         }
2173
2174         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2175         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2176                 uint16_t reason;
2177
2178                 if (vap->iv_state != IEEE80211_S_RUN ||
2179                     /* NB: can happen when in promiscuous mode */
2180                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2181                         vap->iv_stats.is_rx_mgtdiscard++;
2182                         break;
2183                 }
2184                 /*
2185                  * deauth/disassoc frame format
2186                  *      [2] reason
2187                  */
2188                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2189                 reason = le16toh(*(uint16_t *)frm);
2190                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2191                         vap->iv_stats.is_rx_deauth++;
2192                         IEEE80211_NODE_STAT(ni, rx_deauth);
2193                 } else {
2194                         vap->iv_stats.is_rx_disassoc++;
2195                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2196                 }
2197                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2198                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2199                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2200                 if (ni != vap->iv_bss)
2201                         ieee80211_node_leave(ni);
2202                 break;
2203         }
2204
2205         case IEEE80211_FC0_SUBTYPE_ACTION:
2206         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2207                 if (ni == vap->iv_bss) {
2208                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2209                             wh, NULL, "%s", "unknown node");
2210                         vap->iv_stats.is_rx_mgtdiscard++;
2211                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2212                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2213                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2214                             wh, NULL, "%s", "not for us");
2215                         vap->iv_stats.is_rx_mgtdiscard++;
2216                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2217                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2218                             wh, NULL, "wrong state %s",
2219                             ieee80211_state_name[vap->iv_state]);
2220                         vap->iv_stats.is_rx_mgtdiscard++;
2221                 } else {
2222                         if (ieee80211_parse_action(ni, m0) == 0)
2223                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2224                 }
2225                 break;
2226
2227         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2228         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2229         case IEEE80211_FC0_SUBTYPE_ATIM:
2230                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2231                     wh, NULL, "%s", "not handled");
2232                 vap->iv_stats.is_rx_mgtdiscard++;
2233                 break;
2234
2235         default:
2236                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2237                     wh, "mgt", "subtype 0x%x not handled", subtype);
2238                 vap->iv_stats.is_rx_badsubtype++;
2239                 break;
2240         }
2241 }
2242
2243 static void
2244 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2245 {
2246         switch (subtype) {
2247         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2248                 ni->ni_vap->iv_recv_pspoll(ni, m);
2249                 break;
2250         case IEEE80211_FC0_SUBTYPE_BAR:
2251                 ieee80211_recv_bar(ni, m);
2252                 break;
2253         }
2254 }
2255
2256 /*
2257  * Process a received ps-poll frame.
2258  */
2259 void
2260 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2261 {
2262         struct ieee80211vap *vap = ni->ni_vap;
2263         struct ieee80211com *ic = vap->iv_ic;
2264         struct ieee80211_frame_min *wh;
2265         struct mbuf *m;
2266         uint16_t aid;
2267         int qlen;
2268
2269         wh = mtod(m0, struct ieee80211_frame_min *);
2270         if (ni->ni_associd == 0) {
2271                 IEEE80211_DISCARD(vap,
2272                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2273                     (struct ieee80211_frame *) wh, NULL,
2274                     "%s", "unassociated station");
2275                 vap->iv_stats.is_ps_unassoc++;
2276                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2277                         IEEE80211_REASON_NOT_ASSOCED);
2278                 return;
2279         }
2280
2281         aid = le16toh(*(uint16_t *)wh->i_dur);
2282         if (aid != ni->ni_associd) {
2283                 IEEE80211_DISCARD(vap,
2284                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2285                     (struct ieee80211_frame *) wh, NULL,
2286                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2287                     ni->ni_associd, aid);
2288                 vap->iv_stats.is_ps_badaid++;
2289                 /*
2290                  * NB: We used to deauth the station but it turns out
2291                  * the Blackberry Curve 8230 (and perhaps other devices)
2292                  * sometimes send the wrong AID when WME is negotiated.
2293                  * Being more lenient here seems ok as we already check
2294                  * the station is associated and we only return frames
2295                  * queued for the station (i.e. we don't use the AID).
2296                  */
2297                 return;
2298         }
2299
2300         /* Okay, take the first queued packet and put it out... */
2301         m = ieee80211_node_psq_dequeue(ni, &qlen);
2302         if (m == NULL) {
2303                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2304                     "%s", "recv ps-poll, but queue empty");
2305                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2306                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2307                 if (vap->iv_set_tim != NULL)
2308                         vap->iv_set_tim(ni, 0); /* just in case */
2309                 return;
2310         }
2311         /*
2312          * If there are more packets, set the more packets bit
2313          * in the packet dispatched to the station; otherwise
2314          * turn off the TIM bit.
2315          */
2316         if (qlen != 0) {
2317                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2318                     "recv ps-poll, send packet, %u still queued", qlen);
2319                 m->m_flags |= M_MORE_DATA;
2320         } else {
2321                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2322                     "%s", "recv ps-poll, send packet, queue empty");
2323                 if (vap->iv_set_tim != NULL)
2324                         vap->iv_set_tim(ni, 0);
2325         }
2326         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2327
2328         /*
2329          * Do the right thing; if it's an encap'ed frame then
2330          * call ieee80211_parent_xmitpkt() (and free the ref) else
2331          * call ieee80211_vap_xmitpkt().
2332          */
2333         if (m->m_flags & M_ENCAP) {
2334                 if (ieee80211_parent_xmitpkt(ic, m) != 0)
2335                         ieee80211_free_node(ni);
2336         } else {
2337                 (void) ieee80211_vap_xmitpkt(vap, m);
2338         }
2339 }