sys/net80211/ieee80211_hostap.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 HOSTAP mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_media.h>
  52 #include <net/if_llc.h>
  53 #include <net/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_hostap.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63 #include <net80211/ieee80211_wds.h>
  64
  65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  66
  67 static  void hostap_vattach(struct ieee80211vap *);
  68 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  69 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  70             int rssi, int nf);
  71 static void hostap_deliver_data(struct ieee80211vap *,
  72             struct ieee80211_node *, struct mbuf *);
  73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  74             int subtype, int rssi, int nf);
  75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
  77
  78 void
  79 ieee80211_hostap_attach(struct ieee80211com *ic)
  80 {
  81         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  82 }
  83
  84 void
  85 ieee80211_hostap_detach(struct ieee80211com *ic)
  86 {
  87 }
  88
  89 static void
  90 hostap_vdetach(struct ieee80211vap *vap)
  91 {
  92 }
  93
  94 static void
  95 hostap_vattach(struct ieee80211vap *vap)
  96 {
  97         vap->iv_newstate = hostap_newstate;
  98         vap->iv_input = hostap_input;
  99         vap->iv_recv_mgmt = hostap_recv_mgmt;
 100         vap->iv_recv_ctl = hostap_recv_ctl;
 101         vap->iv_opdetach = hostap_vdetach;
 102         vap->iv_deliver_data = hostap_deliver_data;
 103 }
 104
 105 static void
 106 sta_disassoc(void *arg, struct ieee80211_node *ni)
 107 {
 108         struct ieee80211vap *vap = arg;
 109
 110         if (ni->ni_vap == vap && ni->ni_associd != 0) {
 111                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 112                         IEEE80211_REASON_ASSOC_LEAVE);
 113                 ieee80211_node_leave(ni);
 114         }
 115 }
 116
 117 static void
 118 sta_csa(void *arg, struct ieee80211_node *ni)
 119 {
 120         struct ieee80211vap *vap = arg;
 121
 122         if (ni->ni_vap == vap && ni->ni_associd != 0)
 123                 if (ni->ni_inact > vap->iv_inact_init) {
 124                         ni->ni_inact = vap->iv_inact_init;
 125                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 126                             "%s: inact %u", __func__, ni->ni_inact);
 127                 }
 128 }
 129
 130 static void
 131 sta_drop(void *arg, struct ieee80211_node *ni)
 132 {
 133         struct ieee80211vap *vap = arg;
 134
 135         if (ni->ni_vap == vap && ni->ni_associd != 0)
 136                 ieee80211_node_leave(ni);
 137 }
 138
 139 /*
 140  * Does a channel change require associated stations to re-associate
 141  * so protocol state is correct.  This is used when doing CSA across
 142  * bands or similar (e.g. HT -> legacy).
 143  */
 144 static int
 145 isbandchange(struct ieee80211com *ic)
 146 {
 147         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 148             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 149              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 150 }
 151
 152 /*
 153  * IEEE80211_M_HOSTAP vap state machine handler.
 154  */
 155 static int
 156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 157 {
 158         struct ieee80211com *ic = vap->iv_ic;
 159         enum ieee80211_state ostate;
 160
 161         IEEE80211_LOCK_ASSERT(ic);
 162
 163         ostate = vap->iv_state;
 164         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 165             __func__, ieee80211_state_name[ostate],
 166             ieee80211_state_name[nstate], arg);
 167         vap->iv_state = nstate;                 /* state transition */
 168         if (ostate != IEEE80211_S_SCAN)
 169                 ieee80211_cancel_scan(vap);     /* background scan */
 170         switch (nstate) {
 171         case IEEE80211_S_INIT:
 172                 switch (ostate) {
 173                 case IEEE80211_S_SCAN:
 174                         ieee80211_cancel_scan(vap);
 175                         break;
 176                 case IEEE80211_S_CAC:
 177                         ieee80211_dfs_cac_stop(vap);
 178                         break;
 179                 case IEEE80211_S_RUN:
 180                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 181                         break;
 182                 default:
 183                         break;
 184                 }
 185                 if (ostate != IEEE80211_S_INIT) {
 186                         /* NB: optimize INIT -> INIT case */
 187                         ieee80211_reset_bss(vap);
 188                 }
 189                 if (vap->iv_auth->ia_detach != NULL)
 190                         vap->iv_auth->ia_detach(vap);
 191                 break;
 192         case IEEE80211_S_SCAN:
 193                 switch (ostate) {
 194                 case IEEE80211_S_CSA:
 195                 case IEEE80211_S_RUN:
 196                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 197                         /*
 198                          * Clear overlapping BSS state; the beacon frame
 199                          * will be reconstructed on transition to the RUN
 200                          * state and the timeout routines check if the flag
 201                          * is set before doing anything so this is sufficient.
 202                          */
 203                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 204                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 205                         /* fall thru... */
 206                 case IEEE80211_S_CAC:
 207                         /*
 208                          * NB: We may get here because of a manual channel
 209                          *     change in which case we need to stop CAC
 210                          * XXX no need to stop if ostate RUN but it's ok
 211                          */
 212                         ieee80211_dfs_cac_stop(vap);
 213                         /* fall thru... */
 214                 case IEEE80211_S_INIT:
 215                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 216                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 217                                 /*
 218                                  * Already have a channel; bypass the
 219                                  * scan and startup immediately.
 220                                  * ieee80211_create_ibss will call back to
 221                                  * move us to RUN state.
 222                                  */
 223                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 224                                 break;
 225                         }
 226                         /*
 227                          * Initiate a scan.  We can come here as a result
 228                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 229                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 230                          * and the scan request parameters will be present
 231                          * in iv_scanreq.  Otherwise we do the default.
 232                          */
 233                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 234                                 ieee80211_check_scan(vap,
 235                                     vap->iv_scanreq_flags,
 236                                     vap->iv_scanreq_duration,
 237                                     vap->iv_scanreq_mindwell,
 238                                     vap->iv_scanreq_maxdwell,
 239                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 240                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 241                         } else
 242                                 ieee80211_check_scan_current(vap);
 243                         break;
 244                 case IEEE80211_S_SCAN:
 245                         /*
 246                          * A state change requires a reset; scan.
 247                          */
 248                         ieee80211_check_scan_current(vap);
 249                         break;
 250                 default:
 251                         break;
 252                 }
 253                 break;
 254         case IEEE80211_S_CAC:
 255                 /*
 256                  * Start CAC on a DFS channel.  We come here when starting
 257                  * a bss on a DFS channel (see ieee80211_create_ibss).
 258                  */
 259                 ieee80211_dfs_cac_start(vap);
 260                 break;
 261         case IEEE80211_S_RUN:
 262                 if (vap->iv_flags & IEEE80211_F_WPA) {
 263                         /* XXX validate prerequisites */
 264                 }
 265                 switch (ostate) {
 266                 case IEEE80211_S_INIT:
 267                         /*
 268                          * Already have a channel; bypass the
 269                          * scan and startup immediately.
 270                          * Note that ieee80211_create_ibss will call
 271                          * back to do a RUN->RUN state change.
 272                          */
 273                         ieee80211_create_ibss(vap,
 274                             ieee80211_ht_adjust_channel(ic,
 275                                 ic->ic_curchan, vap->iv_flags_ht));
 276                         /* NB: iv_bss is changed on return */
 277                         break;
 278                 case IEEE80211_S_CAC:
 279                         /*
 280                          * NB: This is the normal state change when CAC
 281                          * expires and no radar was detected; no need to
 282                          * clear the CAC timer as it's already expired.
 283                          */
 284                         /* fall thru... */
 285                 case IEEE80211_S_CSA:
 286                         /*
 287                          * Shorten inactivity timer of associated stations
 288                          * to weed out sta's that don't follow a CSA.
 289                          */
 290                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
 291                         /*
 292                          * Update bss node channel to reflect where
 293                          * we landed after CSA.
 294                          */
 295                         ieee80211_node_set_chan(vap->iv_bss,
 296                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
 297                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
 298                         /* XXX bypass debug msgs */
 299                         break;
 300                 case IEEE80211_S_SCAN:
 301                 case IEEE80211_S_RUN:
 302 #ifdef IEEE80211_DEBUG
 303                         if (ieee80211_msg_debug(vap)) {
 304                                 struct ieee80211_node *ni = vap->iv_bss;
 305                                 ieee80211_note(vap,
 306                                     "synchronized with %s ssid ",
 307                                     ether_sprintf(ni->ni_bssid));
 308                                 ieee80211_print_essid(ni->ni_essid,
 309                                     ni->ni_esslen);
 310                                 /* XXX MCS/HT */
 311                                 printf(" channel %d start %uMb\n",
 312                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 313                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 314                         }
 315 #endif
 316                         break;
 317                 default:
 318                         break;
 319                 }
 320                 /*
 321                  * Start/stop the authenticator.  We delay until here
 322                  * to allow configuration to happen out of order.
 323                  */
 324                 if (vap->iv_auth->ia_attach != NULL) {
 325                         /* XXX check failure */
 326                         vap->iv_auth->ia_attach(vap);
 327                 } else if (vap->iv_auth->ia_detach != NULL) {
 328                         vap->iv_auth->ia_detach(vap);
 329                 }
 330                 ieee80211_node_authorize(vap->iv_bss);
 331                 break;
 332         case IEEE80211_S_CSA:
 333                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
 334                         /*
 335                          * On a ``band change'' silently drop associated
 336                          * stations as they must re-associate before they
 337                          * can pass traffic (as otherwise protocol state
 338                          * such as capabilities and the negotiated rate
 339                          * set may/will be wrong).
 340                          */
 341                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
 342                 }
 343                 break;
 344         default:
 345                 break;
 346         }
 347         return 0;
 348 }
 349
 350 static void
 351 hostap_deliver_data(struct ieee80211vap *vap,
 352         struct ieee80211_node *ni, struct mbuf *m)
 353 {
 354         struct ether_header *eh = mtod(m, struct ether_header *);
 355         struct ifnet *ifp = vap->iv_ifp;
 356
 357         /* clear driver/net80211 flags before passing up */
 358         m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
 359
 360         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
 361             ("gack, opmode %d", vap->iv_opmode));
 362         /*
 363          * Do accounting.
 364          */
 365         ifp->if_ipackets++;
 366         IEEE80211_NODE_STAT(ni, rx_data);
 367         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 368         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 369                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
 370                 IEEE80211_NODE_STAT(ni, rx_mcast);
 371         } else
 372                 IEEE80211_NODE_STAT(ni, rx_ucast);
 373
 374         /* perform as a bridge within the AP */
 375         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
 376                 struct mbuf *mcopy = NULL;
 377
 378                 if (m->m_flags & M_MCAST) {
 379                         mcopy = m_dup(m, M_DONTWAIT);
 380                         if (mcopy == NULL)
 381                                 ifp->if_oerrors++;
 382                         else
 383                                 mcopy->m_flags |= M_MCAST;
 384                 } else {
 385                         /*
 386                          * Check if the destination is associated with the
 387                          * same vap and authorized to receive traffic.
 388                          * Beware of traffic destined for the vap itself;
 389                          * sending it will not work; just let it be delivered
 390                          * normally.
 391                          */
 392                         struct ieee80211_node *sta = ieee80211_find_vap_node(
 393                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
 394                         if (sta != NULL) {
 395                                 if (ieee80211_node_is_authorized(sta)) {
 396                                         /*
 397                                          * Beware of sending to ourself; this
 398                                          * needs to happen via the normal
 399                                          * input path.
 400                                          */
 401                                         if (sta != vap->iv_bss) {
 402                                                 mcopy = m;
 403                                                 m = NULL;
 404                                         }
 405                                 } else {
 406                                         vap->iv_stats.is_rx_unauth++;
 407                                         IEEE80211_NODE_STAT(sta, rx_unauth);
 408                                 }
 409                                 ieee80211_free_node(sta);
 410                         }
 411                 }
 412                 if (mcopy != NULL) {
 413                         int len, err;
 414                         len = mcopy->m_pkthdr.len;
 415                         err = ifp->if_transmit(ifp, mcopy);
 416                         if (err) {
 417                                 /* NB: IFQ_HANDOFF reclaims mcopy */
 418                         } else {
 419                                 ifp->if_opackets++;
 420                         }
 421                 }
 422         }
 423         if (m != NULL) {
 424                 /*
 425                  * Mark frame as coming from vap's interface.
 426                  */
 427                 m->m_pkthdr.rcvif = ifp;
 428                 if (m->m_flags & M_MCAST) {
 429                         /*
 430                          * Spam DWDS vap's w/ multicast traffic.
 431                          */
 432                         /* XXX only if dwds in use? */
 433                         ieee80211_dwds_mcast(vap, m);
 434                 }
 435                 if (ni->ni_vlan != 0) {
 436                         /* attach vlan tag */
 437                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
 438                         m->m_flags |= M_VLANTAG;
 439                 }
 440                 ifp->if_input(ifp, m);
 441         }
 442 }
 443
 444 /*
 445  * Decide if a received management frame should be
 446  * printed when debugging is enabled.  This filters some
 447  * of the less interesting frames that come frequently
 448  * (e.g. beacons).
 449  */
 450 static __inline int
 451 doprint(struct ieee80211vap *vap, int subtype)
 452 {
 453         switch (subtype) {
 454         case IEEE80211_FC0_SUBTYPE_BEACON:
 455                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 456         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 457                 return 0;
 458         }
 459         return 1;
 460 }
 461
 462 /*
 463  * Process a received frame.  The node associated with the sender
 464  * should be supplied.  If nothing was found in the node table then
 465  * the caller is assumed to supply a reference to iv_bss instead.
 466  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 467  * during AP scanning to select a AP to associate with; it can have
 468  * any units so long as values have consistent units and higher values
 469  * mean ``better signal''.  The receive timestamp is currently not used
 470  * by the 802.11 layer.
 471  */
 472 static int
 473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 474 {
 475 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
 476 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 477         struct ieee80211vap *vap = ni->ni_vap;
 478         struct ieee80211com *ic = ni->ni_ic;
 479         struct ifnet *ifp = vap->iv_ifp;
 480         struct ieee80211_frame *wh;
 481         struct ieee80211_key *key;
 482         struct ether_header *eh;
 483         int hdrspace, need_tap;
 484         uint8_t dir, type, subtype, qos;
 485         uint8_t *bssid;
 486         uint16_t rxseq;
 487
 488         if (m->m_flags & M_AMPDU_MPDU) {
 489                 /*
 490                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 491                  * w/ M_AMPDU_MPDU marked have already passed through
 492                  * here but were received out of order and been held on
 493                  * the reorder queue.  When resubmitted they are marked
 494                  * with the M_AMPDU_MPDU flag and we can bypass most of
 495                  * the normal processing.
 496                  */
 497                 wh = mtod(m, struct ieee80211_frame *);
 498                 type = IEEE80211_FC0_TYPE_DATA;
 499                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 500                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 501                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 502                 goto resubmit_ampdu;
 503         }
 504
 505         KASSERT(ni != NULL, ("null node"));
 506         ni->ni_inact = ni->ni_inact_reload;
 507
 508         need_tap = 1;                   /* mbuf need to be tapped. */
 509         type = -1;                      /* undefined */
 510
 511         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 512                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 513                     ni->ni_macaddr, NULL,
 514                     "too short (1): len %u", m->m_pkthdr.len);
 515                 vap->iv_stats.is_rx_tooshort++;
 516                 goto out;
 517         }
 518         /*
 519          * Bit of a cheat here, we use a pointer for a 3-address
 520          * frame format but don't reference fields past outside
 521          * ieee80211_frame_min w/o first validating the data is
 522          * present.
 523          */
 524         wh = mtod(m, struct ieee80211_frame *);
 525
 526         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 527             IEEE80211_FC0_VERSION_0) {
 528                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 529                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 530                     wh->i_fc[0], wh->i_fc[1]);
 531                 vap->iv_stats.is_rx_badversion++;
 532                 goto err;
 533         }
 534
 535         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 536         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 537         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 538         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 539                 if (dir != IEEE80211_FC1_DIR_NODS)
 540                         bssid = wh->i_addr1;
 541                 else if (type == IEEE80211_FC0_TYPE_CTL)
 542                         bssid = wh->i_addr1;
 543                 else {
 544                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 545                                 IEEE80211_DISCARD_MAC(vap,
 546                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 547                                     NULL, "too short (2): len %u",
 548                                     m->m_pkthdr.len);
 549                                 vap->iv_stats.is_rx_tooshort++;
 550                                 goto out;
 551                         }
 552                         bssid = wh->i_addr3;
 553                 }
 554                 /*
 555                  * Validate the bssid.
 556                  */
 557                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 558                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 559                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 560                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 561                         /* not interested in */
 562                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 563                             bssid, NULL, "%s", "not to bss");
 564                         vap->iv_stats.is_rx_wrongbss++;
 565                         goto out;
 566                 }
 567
 568                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 569                 ni->ni_noise = nf;
 570                 if (HAS_SEQ(type)) {
 571                         uint8_t tid = ieee80211_gettid(wh);
 572                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 573                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 574                                 ic->ic_wme.wme_hipri_traffic++;
 575                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 576                         if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
 577                             (wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
 578                             SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
 579                                 /* duplicate, discard */
 580                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 581                                     bssid, "duplicate",
 582                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
 583                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 584                                     ni->ni_rxseqs[tid] >>
 585                                         IEEE80211_SEQ_SEQ_SHIFT,
 586                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
 587                                     ni->ni_rxseqs[tid] &
 588                                         IEEE80211_SEQ_FRAG_MASK,
 589                                     tid);
 590                                 vap->iv_stats.is_rx_dup++;
 591                                 IEEE80211_NODE_STAT(ni, rx_dup);
 592                                 goto out;
 593                         }
 594                         ni->ni_rxseqs[tid] = rxseq;
 595                 }
 596         }
 597
 598         switch (type) {
 599         case IEEE80211_FC0_TYPE_DATA:
 600                 hdrspace = ieee80211_hdrspace(ic, wh);
 601                 if (m->m_len < hdrspace &&
 602                     (m = m_pullup(m, hdrspace)) == NULL) {
 603                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 604                             ni->ni_macaddr, NULL,
 605                             "data too short: expecting %u", hdrspace);
 606                         vap->iv_stats.is_rx_tooshort++;
 607                         goto out;               /* XXX */
 608                 }
 609                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 610                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 611                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 612                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 613                                 IEEE80211_DISCARD(vap,
 614                                     IEEE80211_MSG_INPUT, wh, "data",
 615                                     "incorrect dir 0x%x", dir);
 616                         } else {
 617                                 IEEE80211_DISCARD(vap,
 618                                     IEEE80211_MSG_INPUT |
 619                                     IEEE80211_MSG_WDS, wh,
 620                                     "4-address data",
 621                                     "%s", "DWDS not enabled");
 622                         }
 623                         vap->iv_stats.is_rx_wrongdir++;
 624                         goto out;
 625                 }
 626                 /* check if source STA is associated */
 627                 if (ni == vap->iv_bss) {
 628                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 629                             wh, "data", "%s", "unknown src");
 630                         ieee80211_send_error(ni, wh->i_addr2,
 631                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 632                             IEEE80211_REASON_NOT_AUTHED);
 633                         vap->iv_stats.is_rx_notassoc++;
 634                         goto err;
 635                 }
 636                 if (ni->ni_associd == 0) {
 637                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 638                             wh, "data", "%s", "unassoc src");
 639                         IEEE80211_SEND_MGMT(ni,
 640                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 641                             IEEE80211_REASON_NOT_ASSOCED);
 642                         vap->iv_stats.is_rx_notassoc++;
 643                         goto err;
 644                 }
 645
 646                 /*
 647                  * Check for power save state change.
 648                  * XXX out-of-order A-MPDU frames?
 649                  */
 650                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 651                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 652                         ieee80211_node_pwrsave(ni,
 653                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 654                 /*
 655                  * For 4-address packets handle WDS discovery
 656                  * notifications.  Once a WDS link is setup frames
 657                  * are just delivered to the WDS vap (see below).
 658                  */
 659                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 660                         if (!ieee80211_node_is_authorized(ni)) {
 661                                 IEEE80211_DISCARD(vap,
 662                                     IEEE80211_MSG_INPUT |
 663                                     IEEE80211_MSG_WDS, wh,
 664                                     "4-address data",
 665                                     "%s", "unauthorized port");
 666                                 vap->iv_stats.is_rx_unauth++;
 667                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 668                                 goto err;
 669                         }
 670                         ieee80211_dwds_discover(ni, m);
 671                         return type;
 672                 }
 673
 674                 /*
 675                  * Handle A-MPDU re-ordering.  If the frame is to be
 676                  * processed directly then ieee80211_ampdu_reorder
 677                  * will return 0; otherwise it has consumed the mbuf
 678                  * and we should do nothing more with it.
 679                  */
 680                 if ((m->m_flags & M_AMPDU) &&
 681                     ieee80211_ampdu_reorder(ni, m) != 0) {
 682                         m = NULL;
 683                         goto out;
 684                 }
 685         resubmit_ampdu:
 686
 687                 /*
 688                  * Handle privacy requirements.  Note that we
 689                  * must not be preempted from here until after
 690                  * we (potentially) call ieee80211_crypto_demic;
 691                  * otherwise we may violate assumptions in the
 692                  * crypto cipher modules used to do delayed update
 693                  * of replay sequence numbers.
 694                  */
 695                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 696                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 697                                 /*
 698                                  * Discard encrypted frames when privacy is off.
 699                                  */
 700                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 701                                     wh, "WEP", "%s", "PRIVACY off");
 702                                 vap->iv_stats.is_rx_noprivacy++;
 703                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 704                                 goto out;
 705                         }
 706                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 707                         if (key == NULL) {
 708                                 /* NB: stats+msgs handled in crypto_decap */
 709                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 710                                 goto out;
 711                         }
 712                         wh = mtod(m, struct ieee80211_frame *);
 713                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 714                 } else {
 715                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 716                         key = NULL;
 717                 }
 718
 719                 /*
 720                  * Save QoS bits for use below--before we strip the header.
 721                  */
 722                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 723                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 724                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 725                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 726                 } else
 727                         qos = 0;
 728
 729                 /*
 730                  * Next up, any fragmentation.
 731                  */
 732                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 733                         m = ieee80211_defrag(ni, m, hdrspace);
 734                         if (m == NULL) {
 735                                 /* Fragment dropped or frame not complete yet */
 736                                 goto out;
 737                         }
 738                 }
 739                 wh = NULL;              /* no longer valid, catch any uses */
 740
 741                 /*
 742                  * Next strip any MSDU crypto bits.
 743                  */
 744                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 745                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 746                             ni->ni_macaddr, "data", "%s", "demic error");
 747                         vap->iv_stats.is_rx_demicfail++;
 748                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 749                         goto out;
 750                 }
 751                 /* copy to listener after decrypt */
 752                 if (ieee80211_radiotap_active_vap(vap))
 753                         ieee80211_radiotap_rx(vap, m);
 754                 need_tap = 0;
 755                 /*
 756                  * Finally, strip the 802.11 header.
 757                  */
 758                 m = ieee80211_decap(vap, m, hdrspace);
 759                 if (m == NULL) {
 760                         /* XXX mask bit to check for both */
 761                         /* don't count Null data frames as errors */
 762                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 763                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 764                                 goto out;
 765                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 766                             ni->ni_macaddr, "data", "%s", "decap error");
 767                         vap->iv_stats.is_rx_decap++;
 768                         IEEE80211_NODE_STAT(ni, rx_decap);
 769                         goto err;
 770                 }
 771                 eh = mtod(m, struct ether_header *);
 772                 if (!ieee80211_node_is_authorized(ni)) {
 773                         /*
 774                          * Deny any non-PAE frames received prior to
 775                          * authorization.  For open/shared-key
 776                          * authentication the port is mark authorized
 777                          * after authentication completes.  For 802.1x
 778                          * the port is not marked authorized by the
 779                          * authenticator until the handshake has completed.
 780                          */
 781                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 782                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 783                                     eh->ether_shost, "data",
 784                                     "unauthorized port: ether type 0x%x len %u",
 785                                     eh->ether_type, m->m_pkthdr.len);
 786                                 vap->iv_stats.is_rx_unauth++;
 787                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 788                                 goto err;
 789                         }
 790                 } else {
 791                         /*
 792                          * When denying unencrypted frames, discard
 793                          * any non-PAE frames received without encryption.
 794                          */
 795                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 796                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 797                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 798                                 /*
 799                                  * Drop unencrypted frames.
 800                                  */
 801                                 vap->iv_stats.is_rx_unencrypted++;
 802                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 803                                 goto out;
 804                         }
 805                 }
 806                 /* XXX require HT? */
 807                 if (qos & IEEE80211_QOS_AMSDU) {
 808                         m = ieee80211_decap_amsdu(ni, m);
 809                         if (m == NULL)
 810                                 return IEEE80211_FC0_TYPE_DATA;
 811                 } else {
 812 #ifdef IEEE80211_SUPPORT_SUPERG
 813                         m = ieee80211_decap_fastframe(vap, ni, m);
 814                         if (m == NULL)
 815                                 return IEEE80211_FC0_TYPE_DATA;
 816 #endif
 817                 }
 818                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 819                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 820                 else
 821                         hostap_deliver_data(vap, ni, m);
 822                 return IEEE80211_FC0_TYPE_DATA;
 823
 824         case IEEE80211_FC0_TYPE_MGT:
 825                 vap->iv_stats.is_rx_mgmt++;
 826                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 827                 if (dir != IEEE80211_FC1_DIR_NODS) {
 828                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 829                             wh, "mgt", "incorrect dir 0x%x", dir);
 830                         vap->iv_stats.is_rx_wrongdir++;
 831                         goto err;
 832                 }
 833                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 834                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 835                             ni->ni_macaddr, "mgt", "too short: len %u",
 836                             m->m_pkthdr.len);
 837                         vap->iv_stats.is_rx_tooshort++;
 838                         goto out;
 839                 }
 840                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 841                         /* ensure return frames are unicast */
 842                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 843                             wh, NULL, "source is multicast: %s",
 844                             ether_sprintf(wh->i_addr2));
 845                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 846                         goto out;
 847                 }
 848 #ifdef IEEE80211_DEBUG
 849                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 850                     ieee80211_msg_dumppkts(vap)) {
 851                         if_printf(ifp, "received %s from %s rssi %d\n",
 852                             ieee80211_mgt_subtype_name[subtype >>
 853                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 854                             ether_sprintf(wh->i_addr2), rssi);
 855                 }
 856 #endif
 857                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
 858                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 859                                 /*
 860                                  * Only shared key auth frames with a challenge
 861                                  * should be encrypted, discard all others.
 862                                  */
 863                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 864                                     wh, NULL,
 865                                     "%s", "WEP set but not permitted");
 866                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 867                                 goto out;
 868                         }
 869                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 870                                 /*
 871                                  * Discard encrypted frames when privacy is off.
 872                                  */
 873                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 874                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 875                                 vap->iv_stats.is_rx_noprivacy++;
 876                                 goto out;
 877                         }
 878                         hdrspace = ieee80211_hdrspace(ic, wh);
 879                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 880                         if (key == NULL) {
 881                                 /* NB: stats+msgs handled in crypto_decap */
 882                                 goto out;
 883                         }
 884                         wh = mtod(m, struct ieee80211_frame *);
 885                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
 886                 }
 887                 /*
 888                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 889                  * Otherwise iv_recv_mgmt() might pass another packet to
 890                  * radiotap, resulting in out of order packet captures.
 891                  */
 892                 if (ieee80211_radiotap_active_vap(vap))
 893                         ieee80211_radiotap_rx(vap, m);
 894                 need_tap = 0;
 895                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 896                 goto out;
 897
 898         case IEEE80211_FC0_TYPE_CTL:
 899                 vap->iv_stats.is_rx_ctl++;
 900                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 901                 vap->iv_recv_ctl(ni, m, subtype);
 902                 goto out;
 903         default:
 904                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 905                     wh, "bad", "frame type 0x%x", type);
 906                 /* should not come here */
 907                 break;
 908         }
 909 err:
 910         ifp->if_ierrors++;
 911 out:
 912         if (m != NULL) {
 913                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 914                         ieee80211_radiotap_rx(vap, m);
 915                 m_freem(m);
 916         }
 917         return type;
 918 #undef SEQ_LEQ
 919 }
 920
 921 static void
 922 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 923     int rssi, int nf, uint16_t seq, uint16_t status)
 924 {
 925         struct ieee80211vap *vap = ni->ni_vap;
 926
 927         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 928
 929         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 930                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 931                     ni->ni_macaddr, "open auth",
 932                     "bad sta auth mode %u", ni->ni_authmode);
 933                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 934                 /*
 935                  * Clear any challenge text that may be there if
 936                  * a previous shared key auth failed and then an
 937                  * open auth is attempted.
 938                  */
 939                 if (ni->ni_challenge != NULL) {
 940                         free(ni->ni_challenge, M_80211_NODE);
 941                         ni->ni_challenge = NULL;
 942                 }
 943                 /* XXX hack to workaround calling convention */
 944                 ieee80211_send_error(ni, wh->i_addr2,
 945                     IEEE80211_FC0_SUBTYPE_AUTH,
 946                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 947                 return;
 948         }
 949         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 950                 vap->iv_stats.is_rx_bad_auth++;
 951                 return;
 952         }
 953         /* always accept open authentication requests */
 954         if (ni == vap->iv_bss) {
 955                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 956                 if (ni == NULL)
 957                         return;
 958         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 959                 (void) ieee80211_ref_node(ni);
 960         /*
 961          * Mark the node as referenced to reflect that it's
 962          * reference count has been bumped to insure it remains
 963          * after the transaction completes.
 964          */
 965         ni->ni_flags |= IEEE80211_NODE_AREF;
 966         /*
 967          * Mark the node as requiring a valid association id
 968          * before outbound traffic is permitted.
 969          */
 970         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 971
 972         if (vap->iv_acl != NULL &&
 973             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 974                 /*
 975                  * When the ACL policy is set to RADIUS we defer the
 976                  * authorization to a user agent.  Dispatch an event,
 977                  * a subsequent MLME call will decide the fate of the
 978                  * station.  If the user agent is not present then the
 979                  * node will be reclaimed due to inactivity.
 980                  */
 981                 IEEE80211_NOTE_MAC(vap,
 982                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 983                     "%s", "station authentication defered (radius acl)");
 984                 ieee80211_notify_node_auth(ni);
 985         } else {
 986                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 987                 IEEE80211_NOTE_MAC(vap,
 988                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 989                     "%s", "station authenticated (open)");
 990                 /*
 991                  * When 802.1x is not in use mark the port
 992                  * authorized at this point so traffic can flow.
 993                  */
 994                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 995                         ieee80211_node_authorize(ni);
 996         }
 997 }
 998
 999 static void
1000 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
1001     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
1002     uint16_t seq, uint16_t status)
1003 {
1004         struct ieee80211vap *vap = ni->ni_vap;
1005         uint8_t *challenge;
1006         int allocbs, estatus;
1007
1008         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
1009
1010         /*
1011          * NB: this can happen as we allow pre-shared key
1012          * authentication to be enabled w/o wep being turned
1013          * on so that configuration of these can be done
1014          * in any order.  It may be better to enforce the
1015          * ordering in which case this check would just be
1016          * for sanity/consistency.
1017          */
1018         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1019                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1020                     ni->ni_macaddr, "shared key auth",
1021                     "%s", " PRIVACY is disabled");
1022                 estatus = IEEE80211_STATUS_ALG;
1023                 goto bad;
1024         }
1025         /*
1026          * Pre-shared key authentication is evil; accept
1027          * it only if explicitly configured (it is supported
1028          * mainly for compatibility with clients like Mac OS X).
1029          */
1030         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1031             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1032                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1033                     ni->ni_macaddr, "shared key auth",
1034                     "bad sta auth mode %u", ni->ni_authmode);
1035                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1036                 estatus = IEEE80211_STATUS_ALG;
1037                 goto bad;
1038         }
1039
1040         challenge = NULL;
1041         if (frm + 1 < efrm) {
1042                 if ((frm[1] + 2) > (efrm - frm)) {
1043                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1044                             ni->ni_macaddr, "shared key auth",
1045                             "ie %d/%d too long",
1046                             frm[0], (frm[1] + 2) - (efrm - frm));
1047                         vap->iv_stats.is_rx_bad_auth++;
1048                         estatus = IEEE80211_STATUS_CHALLENGE;
1049                         goto bad;
1050                 }
1051                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1052                         challenge = frm;
1053                 frm += frm[1] + 2;
1054         }
1055         switch (seq) {
1056         case IEEE80211_AUTH_SHARED_CHALLENGE:
1057         case IEEE80211_AUTH_SHARED_RESPONSE:
1058                 if (challenge == NULL) {
1059                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1060                             ni->ni_macaddr, "shared key auth",
1061                             "%s", "no challenge");
1062                         vap->iv_stats.is_rx_bad_auth++;
1063                         estatus = IEEE80211_STATUS_CHALLENGE;
1064                         goto bad;
1065                 }
1066                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1067                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1068                             ni->ni_macaddr, "shared key auth",
1069                             "bad challenge len %d", challenge[1]);
1070                         vap->iv_stats.is_rx_bad_auth++;
1071                         estatus = IEEE80211_STATUS_CHALLENGE;
1072                         goto bad;
1073                 }
1074         default:
1075                 break;
1076         }
1077         switch (seq) {
1078         case IEEE80211_AUTH_SHARED_REQUEST:
1079                 if (ni == vap->iv_bss) {
1080                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1081                         if (ni == NULL) {
1082                                 /* NB: no way to return an error */
1083                                 return;
1084                         }
1085                         allocbs = 1;
1086                 } else {
1087                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1088                                 (void) ieee80211_ref_node(ni);
1089                         allocbs = 0;
1090                 }
1091                 /*
1092                  * Mark the node as referenced to reflect that it's
1093                  * reference count has been bumped to insure it remains
1094                  * after the transaction completes.
1095                  */
1096                 ni->ni_flags |= IEEE80211_NODE_AREF;
1097                 /*
1098                  * Mark the node as requiring a valid associatio id
1099                  * before outbound traffic is permitted.
1100                  */
1101                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1102                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1103                 ni->ni_noise = nf;
1104                 if (!ieee80211_alloc_challenge(ni)) {
1105                         /* NB: don't return error so they rexmit */
1106                         return;
1107                 }
1108                 get_random_bytes(ni->ni_challenge,
1109                         IEEE80211_CHALLENGE_LEN);
1110                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1111                     ni, "shared key %sauth request", allocbs ? "" : "re");
1112                 /*
1113                  * When the ACL policy is set to RADIUS we defer the
1114                  * authorization to a user agent.  Dispatch an event,
1115                  * a subsequent MLME call will decide the fate of the
1116                  * station.  If the user agent is not present then the
1117                  * node will be reclaimed due to inactivity.
1118                  */
1119                 if (vap->iv_acl != NULL &&
1120                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1121                         IEEE80211_NOTE_MAC(vap,
1122                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1123                             ni->ni_macaddr,
1124                             "%s", "station authentication defered (radius acl)");
1125                         ieee80211_notify_node_auth(ni);
1126                         return;
1127                 }
1128                 break;
1129         case IEEE80211_AUTH_SHARED_RESPONSE:
1130                 if (ni == vap->iv_bss) {
1131                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132                             ni->ni_macaddr, "shared key response",
1133                             "%s", "unknown station");
1134                         /* NB: don't send a response */
1135                         return;
1136                 }
1137                 if (ni->ni_challenge == NULL) {
1138                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1139                             ni->ni_macaddr, "shared key response",
1140                             "%s", "no challenge recorded");
1141                         vap->iv_stats.is_rx_bad_auth++;
1142                         estatus = IEEE80211_STATUS_CHALLENGE;
1143                         goto bad;
1144                 }
1145                 if (memcmp(ni->ni_challenge, &challenge[2],
1146                            challenge[1]) != 0) {
1147                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148                             ni->ni_macaddr, "shared key response",
1149                             "%s", "challenge mismatch");
1150                         vap->iv_stats.is_rx_auth_fail++;
1151                         estatus = IEEE80211_STATUS_CHALLENGE;
1152                         goto bad;
1153                 }
1154                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1155                     ni, "%s", "station authenticated (shared key)");
1156                 ieee80211_node_authorize(ni);
1157                 break;
1158         default:
1159                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1160                     ni->ni_macaddr, "shared key auth",
1161                     "bad seq %d", seq);
1162                 vap->iv_stats.is_rx_bad_auth++;
1163                 estatus = IEEE80211_STATUS_SEQUENCE;
1164                 goto bad;
1165         }
1166         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1167         return;
1168 bad:
1169         /*
1170          * Send an error response; but only when operating as an AP.
1171          */
1172         /* XXX hack to workaround calling convention */
1173         ieee80211_send_error(ni, wh->i_addr2,
1174             IEEE80211_FC0_SUBTYPE_AUTH,
1175             (seq + 1) | (estatus<<16));
1176 }
1177
1178 /*
1179  * Convert a WPA cipher selector OUI to an internal
1180  * cipher algorithm.  Where appropriate we also
1181  * record any key length.
1182  */
1183 static int
1184 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
1185 {
1186 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1187         uint32_t w = LE_READ_4(sel);
1188
1189         switch (w) {
1190         case WPA_SEL(WPA_CSE_NULL):
1191                 return IEEE80211_CIPHER_NONE;
1192         case WPA_SEL(WPA_CSE_WEP40):
1193                 if (keylen)
1194                         *keylen = 40 / NBBY;
1195                 return IEEE80211_CIPHER_WEP;
1196         case WPA_SEL(WPA_CSE_WEP104):
1197                 if (keylen)
1198                         *keylen = 104 / NBBY;
1199                 return IEEE80211_CIPHER_WEP;
1200         case WPA_SEL(WPA_CSE_TKIP):
1201                 return IEEE80211_CIPHER_TKIP;
1202         case WPA_SEL(WPA_CSE_CCMP):
1203                 return IEEE80211_CIPHER_AES_CCM;
1204         }
1205         return 32;              /* NB: so 1<< is discarded */
1206 #undef WPA_SEL
1207 }
1208
1209 /*
1210  * Convert a WPA key management/authentication algorithm
1211  * to an internal code.
1212  */
1213 static int
1214 wpa_keymgmt(const uint8_t *sel)
1215 {
1216 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1217         uint32_t w = LE_READ_4(sel);
1218
1219         switch (w) {
1220         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1221                 return WPA_ASE_8021X_UNSPEC;
1222         case WPA_SEL(WPA_ASE_8021X_PSK):
1223                 return WPA_ASE_8021X_PSK;
1224         case WPA_SEL(WPA_ASE_NONE):
1225                 return WPA_ASE_NONE;
1226         }
1227         return 0;               /* NB: so is discarded */
1228 #undef WPA_SEL
1229 }
1230
1231 /*
1232  * Parse a WPA information element to collect parameters.
1233  * Note that we do not validate security parameters; that
1234  * is handled by the authenticator; the parsing done here
1235  * is just for internal use in making operational decisions.
1236  */
1237 static int
1238 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1239         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1240 {
1241         uint8_t len = frm[1];
1242         uint32_t w;
1243         int n;
1244
1245         /*
1246          * Check the length once for fixed parts: OUI, type,
1247          * version, mcast cipher, and 2 selector counts.
1248          * Other, variable-length data, must be checked separately.
1249          */
1250         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1251                 IEEE80211_DISCARD_IE(vap,
1252                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1253                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1254                 return IEEE80211_REASON_IE_INVALID;
1255         }
1256         if (len < 14) {
1257                 IEEE80211_DISCARD_IE(vap,
1258                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1259                     wh, "WPA", "too short, len %u", len);
1260                 return IEEE80211_REASON_IE_INVALID;
1261         }
1262         frm += 6, len -= 4;             /* NB: len is payload only */
1263         /* NB: iswapoui already validated the OUI and type */
1264         w = LE_READ_2(frm);
1265         if (w != WPA_VERSION) {
1266                 IEEE80211_DISCARD_IE(vap,
1267                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1268                     wh, "WPA", "bad version %u", w);
1269                 return IEEE80211_REASON_IE_INVALID;
1270         }
1271         frm += 2, len -= 2;
1272
1273         memset(rsn, 0, sizeof(*rsn));
1274
1275         /* multicast/group cipher */
1276         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
1277         frm += 4, len -= 4;
1278
1279         /* unicast ciphers */
1280         n = LE_READ_2(frm);
1281         frm += 2, len -= 2;
1282         if (len < n*4+2) {
1283                 IEEE80211_DISCARD_IE(vap,
1284                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1285                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1286                     len, n);
1287                 return IEEE80211_REASON_IE_INVALID;
1288         }
1289         w = 0;
1290         for (; n > 0; n--) {
1291                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
1292                 frm += 4, len -= 4;
1293         }
1294         if (w & (1<<IEEE80211_CIPHER_TKIP))
1295                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1296         else
1297                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1298
1299         /* key management algorithms */
1300         n = LE_READ_2(frm);
1301         frm += 2, len -= 2;
1302         if (len < n*4) {
1303                 IEEE80211_DISCARD_IE(vap,
1304                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1306                     len, n);
1307                 return IEEE80211_REASON_IE_INVALID;
1308         }
1309         w = 0;
1310         for (; n > 0; n--) {
1311                 w |= wpa_keymgmt(frm);
1312                 frm += 4, len -= 4;
1313         }
1314         if (w & WPA_ASE_8021X_UNSPEC)
1315                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1316         else
1317                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1318
1319         if (len > 2)            /* optional capabilities */
1320                 rsn->rsn_caps = LE_READ_2(frm);
1321
1322         return 0;
1323 }
1324
1325 /*
1326  * Convert an RSN cipher selector OUI to an internal
1327  * cipher algorithm.  Where appropriate we also
1328  * record any key length.
1329  */
1330 static int
1331 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
1332 {
1333 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1334         uint32_t w = LE_READ_4(sel);
1335
1336         switch (w) {
1337         case RSN_SEL(RSN_CSE_NULL):
1338                 return IEEE80211_CIPHER_NONE;
1339         case RSN_SEL(RSN_CSE_WEP40):
1340                 if (keylen)
1341                         *keylen = 40 / NBBY;
1342                 return IEEE80211_CIPHER_WEP;
1343         case RSN_SEL(RSN_CSE_WEP104):
1344                 if (keylen)
1345                         *keylen = 104 / NBBY;
1346                 return IEEE80211_CIPHER_WEP;
1347         case RSN_SEL(RSN_CSE_TKIP):
1348                 return IEEE80211_CIPHER_TKIP;
1349         case RSN_SEL(RSN_CSE_CCMP):
1350                 return IEEE80211_CIPHER_AES_CCM;
1351         case RSN_SEL(RSN_CSE_WRAP):
1352                 return IEEE80211_CIPHER_AES_OCB;
1353         }
1354         return 32;              /* NB: so 1<< is discarded */
1355 #undef WPA_SEL
1356 }
1357
1358 /*
1359  * Convert an RSN key management/authentication algorithm
1360  * to an internal code.
1361  */
1362 static int
1363 rsn_keymgmt(const uint8_t *sel)
1364 {
1365 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1366         uint32_t w = LE_READ_4(sel);
1367
1368         switch (w) {
1369         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1370                 return RSN_ASE_8021X_UNSPEC;
1371         case RSN_SEL(RSN_ASE_8021X_PSK):
1372                 return RSN_ASE_8021X_PSK;
1373         case RSN_SEL(RSN_ASE_NONE):
1374                 return RSN_ASE_NONE;
1375         }
1376         return 0;               /* NB: so is discarded */
1377 #undef RSN_SEL
1378 }
1379
1380 /*
1381  * Parse a WPA/RSN information element to collect parameters
1382  * and validate the parameters against what has been
1383  * configured for the system.
1384  */
1385 static int
1386 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1387         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1388 {
1389         uint8_t len = frm[1];
1390         uint32_t w;
1391         int n;
1392
1393         /*
1394          * Check the length once for fixed parts:
1395          * version, mcast cipher, and 2 selector counts.
1396          * Other, variable-length data, must be checked separately.
1397          */
1398         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1399                 IEEE80211_DISCARD_IE(vap,
1400                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1401                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1402                 return IEEE80211_REASON_IE_INVALID;
1403         }
1404         if (len < 10) {
1405                 IEEE80211_DISCARD_IE(vap,
1406                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1407                     wh, "RSN", "too short, len %u", len);
1408                 return IEEE80211_REASON_IE_INVALID;
1409         }
1410         frm += 2;
1411         w = LE_READ_2(frm);
1412         if (w != RSN_VERSION) {
1413                 IEEE80211_DISCARD_IE(vap,
1414                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1415                     wh, "RSN", "bad version %u", w);
1416                 return IEEE80211_REASON_IE_INVALID;
1417         }
1418         frm += 2, len -= 2;
1419
1420         memset(rsn, 0, sizeof(*rsn));
1421
1422         /* multicast/group cipher */
1423         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
1424         frm += 4, len -= 4;
1425
1426         /* unicast ciphers */
1427         n = LE_READ_2(frm);
1428         frm += 2, len -= 2;
1429         if (len < n*4+2) {
1430                 IEEE80211_DISCARD_IE(vap,
1431                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1432                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1433                     len, n);
1434                 return IEEE80211_REASON_IE_INVALID;
1435         }
1436         w = 0;
1437         for (; n > 0; n--) {
1438                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
1439                 frm += 4, len -= 4;
1440         }
1441         if (w & (1<<IEEE80211_CIPHER_TKIP))
1442                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1443         else
1444                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1445
1446         /* key management algorithms */
1447         n = LE_READ_2(frm);
1448         frm += 2, len -= 2;
1449         if (len < n*4) {
1450                 IEEE80211_DISCARD_IE(vap,
1451                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1452                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1453                     len, n);
1454                 return IEEE80211_REASON_IE_INVALID;
1455         }
1456         w = 0;
1457         for (; n > 0; n--) {
1458                 w |= rsn_keymgmt(frm);
1459                 frm += 4, len -= 4;
1460         }
1461         if (w & RSN_ASE_8021X_UNSPEC)
1462                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1463         else
1464                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1465
1466         /* optional RSN capabilities */
1467         if (len > 2)
1468                 rsn->rsn_caps = LE_READ_2(frm);
1469         /* XXXPMKID */
1470
1471         return 0;
1472 }
1473
1474 /*
1475  * WPA/802.11i assocation request processing.
1476  */
1477 static int
1478 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1479         const struct ieee80211_frame *wh, const uint8_t *wpa,
1480         const uint8_t *rsn, uint16_t capinfo)
1481 {
1482         struct ieee80211vap *vap = ni->ni_vap;
1483         uint8_t reason;
1484         int badwparsn;
1485
1486         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1487         if (wpa == NULL && rsn == NULL) {
1488                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1489                         /*
1490                          * W-Fi Protected Setup (WPS) permits
1491                          * clients to associate and pass EAPOL frames
1492                          * to establish initial credentials.
1493                          */
1494                         ni->ni_flags |= IEEE80211_NODE_WPS;
1495                         return 1;
1496                 }
1497                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1498                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1499                         /*
1500                          * Transitional Security Network.  Permits clients
1501                          * to associate and use WEP while WPA is configured.
1502                          */
1503                         ni->ni_flags |= IEEE80211_NODE_TSN;
1504                         return 1;
1505                 }
1506                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1507                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1508                 vap->iv_stats.is_rx_assoc_badwpaie++;
1509                 reason = IEEE80211_REASON_IE_INVALID;
1510                 goto bad;
1511         }
1512         /* assert right association security credentials */
1513         badwparsn = 0;                  /* NB: to silence compiler */
1514         switch (vap->iv_flags & IEEE80211_F_WPA) {
1515         case IEEE80211_F_WPA1:
1516                 badwparsn = (wpa == NULL);
1517                 break;
1518         case IEEE80211_F_WPA2:
1519                 badwparsn = (rsn == NULL);
1520                 break;
1521         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1522                 badwparsn = (wpa == NULL && rsn == NULL);
1523                 break;
1524         }
1525         if (badwparsn) {
1526                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1527                     wh, NULL,
1528                     "%s", "missing WPA/RSN IE in association request");
1529                 vap->iv_stats.is_rx_assoc_badwpaie++;
1530                 reason = IEEE80211_REASON_IE_INVALID;
1531                 goto bad;
1532         }
1533         /*
1534          * Parse WPA/RSN information element.
1535          */
1536         if (wpa != NULL)
1537                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1538         else
1539                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1540         if (reason != 0) {
1541                 /* XXX distinguish WPA/RSN? */
1542                 vap->iv_stats.is_rx_assoc_badwpaie++;
1543                 goto bad;
1544         }
1545         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1546             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1547             wpa != NULL ? "WPA" : "RSN",
1548             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1549             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1550             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1551
1552         return 1;
1553 bad:
1554         ieee80211_node_deauth(ni, reason);
1555         return 0;
1556 }
1557
1558 /* XXX find a better place for definition */
1559 struct l2_update_frame {
1560         struct ether_header eh;
1561         uint8_t dsap;
1562         uint8_t ssap;
1563         uint8_t control;
1564         uint8_t xid[3];
1565 }  __packed;
1566
1567 /*
1568  * Deliver a TGf L2UF frame on behalf of a station.
1569  * This primes any bridge when the station is roaming
1570  * between ap's on the same wired network.
1571  */
1572 static void
1573 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1574 {
1575         struct ieee80211vap *vap = ni->ni_vap;
1576         struct ifnet *ifp = vap->iv_ifp;
1577         struct mbuf *m;
1578         struct l2_update_frame *l2uf;
1579         struct ether_header *eh;
1580
1581         m = m_gethdr(M_NOWAIT, MT_DATA);
1582         if (m == NULL) {
1583                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1584                     "%s", "no mbuf for l2uf frame");
1585                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1586                 return;
1587         }
1588         l2uf = mtod(m, struct l2_update_frame *);
1589         eh = &l2uf->eh;
1590         /* dst: Broadcast address */
1591         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1592         /* src: associated STA */
1593         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1594         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1595
1596         l2uf->dsap = 0;
1597         l2uf->ssap = 0;
1598         l2uf->control = 0xf5;
1599         l2uf->xid[0] = 0x81;
1600         l2uf->xid[1] = 0x80;
1601         l2uf->xid[2] = 0x00;
1602
1603         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1604         hostap_deliver_data(vap, ni, m);
1605 }
1606
1607 static void
1608 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1609         int reassoc, int resp, const char *tag, int rate)
1610 {
1611         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1612             "deny %s request, %s rate set mismatch, rate/MCS %d",
1613             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1614         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1615         ieee80211_node_leave(ni);
1616 }
1617
1618 static void
1619 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1620         int reassoc, int resp, const char *tag, int capinfo)
1621 {
1622         struct ieee80211vap *vap = ni->ni_vap;
1623
1624         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1625             "deny %s request, %s mismatch 0x%x",
1626             reassoc ? "reassoc" : "assoc", tag, capinfo);
1627         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1628         ieee80211_node_leave(ni);
1629         vap->iv_stats.is_rx_assoc_capmismatch++;
1630 }
1631
1632 static void
1633 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1634         int reassoc, int resp)
1635 {
1636         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1637             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1638         /* XXX no better code */
1639         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1640         ieee80211_node_leave(ni);
1641 }
1642
1643 static void
1644 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1645         int algo, int seq, int status)
1646 {
1647         struct ieee80211vap *vap = ni->ni_vap;
1648
1649         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1650             wh, NULL, "unsupported alg %d", algo);
1651         vap->iv_stats.is_rx_auth_unsupported++;
1652         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1653             seq | (status << 16));
1654 }
1655
1656 static __inline int
1657 ishtmixed(const uint8_t *ie)
1658 {
1659         const struct ieee80211_ie_htinfo *ht =
1660             (const struct ieee80211_ie_htinfo *) ie;
1661         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1662             IEEE80211_HTINFO_OPMODE_MIXED;
1663 }
1664
1665 static int
1666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1667 {
1668         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1669         int i;
1670
1671         /* NB: the 11b clients we care about will not have xrates */
1672         if (xrates != NULL || rates == NULL)
1673                 return 0;
1674         for (i = 0; i < rates[1]; i++) {
1675                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1676                 if (r > 2*11 || ((1<<r) & brates) == 0)
1677                         return 0;
1678         }
1679         return 1;
1680 }
1681
1682 static void
1683 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1684         int subtype, int rssi, int nf)
1685 {
1686         struct ieee80211vap *vap = ni->ni_vap;
1687         struct ieee80211com *ic = ni->ni_ic;
1688         struct ieee80211_frame *wh;
1689         uint8_t *frm, *efrm, *sfrm;
1690         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1691         int reassoc, resp;
1692         uint8_t rate;
1693
1694         wh = mtod(m0, struct ieee80211_frame *);
1695         frm = (uint8_t *)&wh[1];
1696         efrm = mtod(m0, uint8_t *) + m0->m_len;
1697         switch (subtype) {
1698         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1699         case IEEE80211_FC0_SUBTYPE_BEACON: {
1700                 struct ieee80211_scanparams scan;
1701                 /*
1702                  * We process beacon/probe response frames when scanning;
1703                  * otherwise we check beacon frames for overlapping non-ERP
1704                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1705                  */
1706                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
1707                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
1708                         vap->iv_stats.is_rx_mgtdiscard++;
1709                         return;
1710                 }
1711                 /* NB: accept off-channel frames */
1712                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1713                         return;
1714                 /*
1715                  * Count frame now that we know it's to be processed.
1716                  */
1717                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1718                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1719                         IEEE80211_NODE_STAT(ni, rx_beacons);
1720                 } else
1721                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1722                 /*
1723                  * If scanning, just pass information to the scan module.
1724                  */
1725                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1726                         if (scan.status == 0 &&         /* NB: on channel */
1727                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1728                                 /*
1729                                  * Actively scanning a channel marked passive;
1730                                  * send a probe request now that we know there
1731                                  * is 802.11 traffic present.
1732                                  *
1733                                  * XXX check if the beacon we recv'd gives
1734                                  * us what we need and suppress the probe req
1735                                  */
1736                                 ieee80211_probe_curchan(vap, 1);
1737                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1738                         }
1739                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
1740                         return;
1741                 }
1742                 /*
1743                  * Check beacon for overlapping bss w/ non ERP stations.
1744                  * If we detect one and protection is configured but not
1745                  * enabled, enable it and start a timer that'll bring us
1746                  * out if we stop seeing the bss.
1747                  */
1748                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1749                     scan.status == 0 &&                 /* NB: on-channel */
1750                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1751                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1752                         ic->ic_lastnonerp = ticks;
1753                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1754                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1755                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1756                                 IEEE80211_NOTE_FRAME(vap,
1757                                     IEEE80211_MSG_ASSOC, wh,
1758                                     "non-ERP present on channel %d "
1759                                     "(saw erp 0x%x from channel %d), "
1760                                     "enable use of protection",
1761                                     ic->ic_curchan->ic_ieee,
1762                                     scan.erp, scan.chan);
1763                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1764                                 ieee80211_notify_erp(ic);
1765                         }
1766                 }
1767                 /*
1768                  * Check beacon for non-HT station on HT channel
1769                  * and update HT BSS occupancy as appropriate.
1770                  */
1771                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1772                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1773                                 /*
1774                                  * Off control channel; only check frames
1775                                  * that come in the extension channel when
1776                                  * operating w/ HT40.
1777                                  */
1778                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1779                                         break;
1780                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1781                                         break;
1782                         }
1783                         if (scan.htinfo == NULL) {
1784                                 ieee80211_htprot_update(ic,
1785                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1786                                     IEEE80211_HTINFO_NONHT_PRESENT);
1787                         } else if (ishtmixed(scan.htinfo)) {
1788                                 /* XXX? take NONHT_PRESENT from beacon? */
1789                                 ieee80211_htprot_update(ic,
1790                                     IEEE80211_HTINFO_OPMODE_MIXED |
1791                                     IEEE80211_HTINFO_NONHT_PRESENT);
1792                         }
1793                 }
1794                 break;
1795         }
1796
1797         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1798                 if (vap->iv_state != IEEE80211_S_RUN) {
1799                         vap->iv_stats.is_rx_mgtdiscard++;
1800                         return;
1801                 }
1802                 /*
1803                  * prreq frame format
1804                  *      [tlv] ssid
1805                  *      [tlv] supported rates
1806                  *      [tlv] extended supported rates
1807                  */
1808                 ssid = rates = xrates = NULL;
1809                 sfrm = frm;
1810                 while (efrm - frm > 1) {
1811                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1812                         switch (*frm) {
1813                         case IEEE80211_ELEMID_SSID:
1814                                 ssid = frm;
1815                                 break;
1816                         case IEEE80211_ELEMID_RATES:
1817                                 rates = frm;
1818                                 break;
1819                         case IEEE80211_ELEMID_XRATES:
1820                                 xrates = frm;
1821                                 break;
1822                         }
1823                         frm += frm[1] + 2;
1824                 }
1825                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1826                 if (xrates != NULL)
1827                         IEEE80211_VERIFY_ELEMENT(xrates,
1828                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1829                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1830                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1831                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1832                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1833                             wh, NULL,
1834                             "%s", "no ssid with ssid suppression enabled");
1835                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1836                         return;
1837                 }
1838
1839                 /* XXX find a better class or define it's own */
1840                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1841                     "%s", "recv probe req");
1842                 /*
1843                  * Some legacy 11b clients cannot hack a complete
1844                  * probe response frame.  When the request includes
1845                  * only a bare-bones rate set, communicate this to
1846                  * the transmit side.
1847                  */
1848                 ieee80211_send_proberesp(vap, wh->i_addr2,
1849                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1850                 break;
1851
1852         case IEEE80211_FC0_SUBTYPE_AUTH: {
1853                 uint16_t algo, seq, status;
1854
1855                 if (vap->iv_state != IEEE80211_S_RUN) {
1856                         vap->iv_stats.is_rx_mgtdiscard++;
1857                         return;
1858                 }
1859                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1860                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1861                             wh, NULL, "%s", "wrong bssid");
1862                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1863                         return;
1864                 }
1865                 /*
1866                  * auth frame format
1867                  *      [2] algorithm
1868                  *      [2] sequence
1869                  *      [2] status
1870                  *      [tlv*] challenge
1871                  */
1872                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1873                 algo   = le16toh(*(uint16_t *)frm);
1874                 seq    = le16toh(*(uint16_t *)(frm + 2));
1875                 status = le16toh(*(uint16_t *)(frm + 4));
1876                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1877                     "recv auth frame with algorithm %d seq %d", algo, seq);
1878                 /*
1879                  * Consult the ACL policy module if setup.
1880                  */
1881                 if (vap->iv_acl != NULL &&
1882                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
1883                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1884                             wh, NULL, "%s", "disallowed by ACL");
1885                         vap->iv_stats.is_rx_acl++;
1886                         ieee80211_send_error(ni, wh->i_addr2,
1887                             IEEE80211_FC0_SUBTYPE_AUTH,
1888                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1889                         return;
1890                 }
1891                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1892                         IEEE80211_DISCARD(vap,
1893                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1894                             wh, NULL, "%s", "TKIP countermeasures enabled");
1895                         vap->iv_stats.is_rx_auth_countermeasures++;
1896                         ieee80211_send_error(ni, wh->i_addr2,
1897                                 IEEE80211_FC0_SUBTYPE_AUTH,
1898                                 IEEE80211_REASON_MIC_FAILURE);
1899                         return;
1900                 }
1901                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1902                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1903                             seq, status);
1904                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1905                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1906                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1907                         authalgreject(ni, wh, algo,
1908                             seq+1, IEEE80211_STATUS_ALG);
1909                         return;
1910                 } else {
1911                         /*
1912                          * We assume that an unknown algorithm is the result
1913                          * of a decryption failure on a shared key auth frame;
1914                          * return a status code appropriate for that instead
1915                          * of IEEE80211_STATUS_ALG.
1916                          *
1917                          * NB: a seq# of 4 is intentional; the decrypted
1918                          *     frame likely has a bogus seq value.
1919                          */
1920                         authalgreject(ni, wh, algo,
1921                             4, IEEE80211_STATUS_CHALLENGE);
1922                         return;
1923                 }
1924                 break;
1925         }
1926
1927         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1928         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1929                 uint16_t capinfo, lintval;
1930                 struct ieee80211_rsnparms rsnparms;
1931
1932                 if (vap->iv_state != IEEE80211_S_RUN) {
1933                         vap->iv_stats.is_rx_mgtdiscard++;
1934                         return;
1935                 }
1936                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1937                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1938                             wh, NULL, "%s", "wrong bssid");
1939                         vap->iv_stats.is_rx_assoc_bss++;
1940                         return;
1941                 }
1942                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1943                         reassoc = 1;
1944                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1945                 } else {
1946                         reassoc = 0;
1947                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
1948                 }
1949                 if (ni == vap->iv_bss) {
1950                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1951                             "deny %s request, sta not authenticated",
1952                             reassoc ? "reassoc" : "assoc");
1953                         ieee80211_send_error(ni, wh->i_addr2,
1954                             IEEE80211_FC0_SUBTYPE_DEAUTH,
1955                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
1956                         vap->iv_stats.is_rx_assoc_notauth++;
1957                         return;
1958                 }
1959
1960                 /*
1961                  * asreq frame format
1962                  *      [2] capability information
1963                  *      [2] listen interval
1964                  *      [6*] current AP address (reassoc only)
1965                  *      [tlv] ssid
1966                  *      [tlv] supported rates
1967                  *      [tlv] extended supported rates
1968                  *      [tlv] WPA or RSN
1969                  *      [tlv] HT capabilities
1970                  *      [tlv] Atheros capabilities
1971                  */
1972                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
1973                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
1974                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
1975                 if (reassoc)
1976                         frm += 6;       /* ignore current AP info */
1977                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
1978                 sfrm = frm;
1979                 while (efrm - frm > 1) {
1980                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1981                         switch (*frm) {
1982                         case IEEE80211_ELEMID_SSID:
1983                                 ssid = frm;
1984                                 break;
1985                         case IEEE80211_ELEMID_RATES:
1986                                 rates = frm;
1987                                 break;
1988                         case IEEE80211_ELEMID_XRATES:
1989                                 xrates = frm;
1990                                 break;
1991                         case IEEE80211_ELEMID_RSN:
1992                                 rsn = frm;
1993                                 break;
1994                         case IEEE80211_ELEMID_HTCAP:
1995                                 htcap = frm;
1996                                 break;
1997                         case IEEE80211_ELEMID_VENDOR:
1998                                 if (iswpaoui(frm))
1999                                         wpa = frm;
2000                                 else if (iswmeinfo(frm))
2001                                         wme = frm;
2002 #ifdef IEEE80211_SUPPORT_SUPERG
2003                                 else if (isatherosoui(frm))
2004                                         ath = frm;
2005 #endif
2006                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2007                                         if (ishtcapoui(frm) && htcap == NULL)
2008                                                 htcap = frm;
2009                                 }
2010                                 break;
2011                         }
2012                         frm += frm[1] + 2;
2013                 }
2014                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2015                 if (xrates != NULL)
2016                         IEEE80211_VERIFY_ELEMENT(xrates,
2017                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2018                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2019                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2020                 if (htcap != NULL) {
2021                         IEEE80211_VERIFY_LENGTH(htcap[1],
2022                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2023                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2024                                  sizeof(struct ieee80211_ie_htcap)-2,
2025                              return);           /* XXX just NULL out? */
2026                 }
2027
2028                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2029                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2030                         return;
2031                 /* discard challenge after association */
2032                 if (ni->ni_challenge != NULL) {
2033                         free(ni->ni_challenge, M_80211_NODE);
2034                         ni->ni_challenge = NULL;
2035                 }
2036                 /* NB: 802.11 spec says to ignore station's privacy bit */
2037                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2038                         capinfomismatch(ni, wh, reassoc, resp,
2039                             "capability", capinfo);
2040                         return;
2041                 }
2042                 /*
2043                  * Disallow re-associate w/ invalid slot time setting.
2044                  */
2045                 if (ni->ni_associd != 0 &&
2046                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2047                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2048                         capinfomismatch(ni, wh, reassoc, resp,
2049                             "slot time", capinfo);
2050                         return;
2051                 }
2052                 rate = ieee80211_setup_rates(ni, rates, xrates,
2053                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2054                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2055                 if (rate & IEEE80211_RATE_BASIC) {
2056                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2057                         vap->iv_stats.is_rx_assoc_norate++;
2058                         return;
2059                 }
2060                 /*
2061                  * If constrained to 11g-only stations reject an
2062                  * 11b-only station.  We cheat a bit here by looking
2063                  * at the max negotiated xmit rate and assuming anyone
2064                  * with a best rate <24Mb/s is an 11b station.
2065                  */
2066                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2067                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2068                         vap->iv_stats.is_rx_assoc_norate++;
2069                         return;
2070                 }
2071                 /*
2072                  * Do HT rate set handling and setup HT node state.
2073                  */
2074                 ni->ni_chan = vap->iv_bss->ni_chan;
2075                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2076                         rate = ieee80211_setup_htrates(ni, htcap,
2077                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2078                                 IEEE80211_F_DOBRS);
2079                         if (rate & IEEE80211_RATE_BASIC) {
2080                                 ratesetmismatch(ni, wh, reassoc, resp,
2081                                     "HT", rate);
2082                                 vap->iv_stats.is_ht_assoc_norate++;
2083                                 return;
2084                         }
2085                         ieee80211_ht_node_init(ni);
2086                         ieee80211_ht_updatehtcap(ni, htcap);
2087                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2088                         ieee80211_ht_node_cleanup(ni);
2089 #ifdef IEEE80211_SUPPORT_SUPERG
2090                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
2091                         ieee80211_ff_node_cleanup(ni);
2092 #endif
2093                 /*
2094                  * Allow AMPDU operation only with unencrypted traffic
2095                  * or AES-CCM; the 11n spec only specifies these ciphers
2096                  * so permitting any others is undefined and can lead
2097                  * to interoperability problems.
2098                  */
2099                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2100                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2101                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2102                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2103                         IEEE80211_NOTE(vap,
2104                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2105                             "disallow HT use because WEP or TKIP requested, "
2106                             "capinfo 0x%x ucastcipher %d", capinfo,
2107                             rsnparms.rsn_ucastcipher);
2108                         ieee80211_ht_node_cleanup(ni);
2109                         vap->iv_stats.is_ht_assoc_downgrade++;
2110                 }
2111                 /*
2112                  * If constrained to 11n-only stations reject legacy stations.
2113                  */
2114                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2115                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2116                         htcapmismatch(ni, wh, reassoc, resp);
2117                         vap->iv_stats.is_ht_assoc_nohtcap++;
2118                         return;
2119                 }
2120                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2121                 ni->ni_noise = nf;
2122                 ni->ni_intval = lintval;
2123                 ni->ni_capinfo = capinfo;
2124                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2125                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2126                 /*
2127                  * Store the IEs.
2128                  * XXX maybe better to just expand
2129                  */
2130                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2131 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2132                         if (wpa != NULL)
2133                                 setie(wpa_ie, wpa - sfrm);
2134                         if (rsn != NULL)
2135                                 setie(rsn_ie, rsn - sfrm);
2136                         if (htcap != NULL)
2137                                 setie(htcap_ie, htcap - sfrm);
2138                         if (wme != NULL) {
2139                                 setie(wme_ie, wme - sfrm);
2140                                 /*
2141                                  * Mark node as capable of QoS.
2142                                  */
2143                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2144                         } else
2145                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2146 #ifdef IEEE80211_SUPPORT_SUPERG
2147                         if (ath != NULL) {
2148                                 setie(ath_ie, ath - sfrm);
2149                                 /*
2150                                  * Parse ATH station parameters.
2151                                  */
2152                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2153                         } else
2154 #endif
2155                                 ni->ni_ath_flags = 0;
2156 #undef setie
2157                 } else {
2158                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2159                         ni->ni_ath_flags = 0;
2160                 }
2161                 ieee80211_node_join(ni, resp);
2162                 ieee80211_deliver_l2uf(ni);
2163                 break;
2164         }
2165
2166         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2167         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2168                 uint16_t reason;
2169
2170                 if (vap->iv_state != IEEE80211_S_RUN ||
2171                     /* NB: can happen when in promiscuous mode */
2172                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2173                         vap->iv_stats.is_rx_mgtdiscard++;
2174                         break;
2175                 }
2176                 /*
2177                  * deauth/disassoc frame format
2178                  *      [2] reason
2179                  */
2180                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2181                 reason = le16toh(*(uint16_t *)frm);
2182                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2183                         vap->iv_stats.is_rx_deauth++;
2184                         IEEE80211_NODE_STAT(ni, rx_deauth);
2185                 } else {
2186                         vap->iv_stats.is_rx_disassoc++;
2187                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2188                 }
2189                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2190                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
2191                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
2192                 if (ni != vap->iv_bss)
2193                         ieee80211_node_leave(ni);
2194                 break;
2195         }
2196
2197         case IEEE80211_FC0_SUBTYPE_ACTION:
2198                 if (vap->iv_state == IEEE80211_S_RUN) {
2199                         if (ieee80211_parse_action(ni, m0) == 0)
2200                                 ic->ic_recv_action(ni, wh, frm, efrm);
2201                 } else
2202                         vap->iv_stats.is_rx_mgtdiscard++;
2203                 break;
2204
2205         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2206         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2207         default:
2208                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2209                      wh, "mgt", "subtype 0x%x not handled", subtype);
2210                 vap->iv_stats.is_rx_badsubtype++;
2211                 break;
2212         }
2213 }
2214
2215 static void
2216 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2217 {
2218         switch (subtype) {
2219         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2220                 hostap_recv_pspoll(ni, m);
2221                 break;
2222         case IEEE80211_FC0_SUBTYPE_BAR:
2223                 ieee80211_recv_bar(ni, m);
2224                 break;
2225         }
2226 }
2227
2228 /*
2229  * Process a received ps-poll frame.
2230  */
2231 static void
2232 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2233 {
2234         struct ieee80211vap *vap = ni->ni_vap;
2235         struct ieee80211_frame_min *wh;
2236         struct ifnet *ifp;
2237         struct mbuf *m;
2238         uint16_t aid;
2239         int qlen;
2240
2241         wh = mtod(m0, struct ieee80211_frame_min *);
2242         if (ni->ni_associd == 0) {
2243                 IEEE80211_DISCARD(vap,
2244                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2245                     (struct ieee80211_frame *) wh, NULL,
2246                     "%s", "unassociated station");
2247                 vap->iv_stats.is_ps_unassoc++;
2248                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2249                         IEEE80211_REASON_NOT_ASSOCED);
2250                 return;
2251         }
2252
2253         aid = le16toh(*(uint16_t *)wh->i_dur);
2254         if (aid != ni->ni_associd) {
2255                 IEEE80211_DISCARD(vap,
2256                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2257                     (struct ieee80211_frame *) wh, NULL,
2258                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2259                     ni->ni_associd, aid);
2260                 vap->iv_stats.is_ps_badaid++;
2261                 /*
2262                  * NB: We used to deauth the station but it turns out
2263                  * the Blackberry Curve 8230 (and perhaps other devices)
2264                  * sometimes send the wrong AID when WME is negotiated.
2265                  * Being more lenient here seems ok as we already check
2266                  * the station is associated and we only return frames
2267                  * queued for the station (i.e. we don't use the AID).
2268                  */
2269                 return;
2270         }
2271
2272         /* Okay, take the first queued packet and put it out... */
2273         m = ieee80211_node_psq_dequeue(ni, &qlen);
2274         if (m == NULL) {
2275                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2276                     "%s", "recv ps-poll, but queue empty");
2277                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2278                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2279                 if (vap->iv_set_tim != NULL)
2280                         vap->iv_set_tim(ni, 0); /* just in case */
2281                 return;
2282         }
2283         /*
2284          * If there are more packets, set the more packets bit
2285          * in the packet dispatched to the station; otherwise
2286          * turn off the TIM bit.
2287          */
2288         if (qlen != 0) {
2289                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2290                     "recv ps-poll, send packet, %u still queued", qlen);
2291                 m->m_flags |= M_MORE_DATA;
2292         } else {
2293                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2294                     "%s", "recv ps-poll, send packet, queue empty");
2295                 if (vap->iv_set_tim != NULL)
2296                         vap->iv_set_tim(ni, 0);
2297         }
2298         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2299
2300         if (m->m_flags & M_ENCAP)
2301                 ifp = vap->iv_ic->ic_ifp;
2302         else
2303                 ifp = vap->iv_ifp;
2304         IF_ENQUEUE(&ifp->if_snd, m);
2305         if_start(ifp);
2306 }