sys/net80211/ieee80211_hostap.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 HOSTAP mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <net80211/ieee80211_var.h>
  59 #include <net80211/ieee80211_hostap.h>
  60 #include <net80211/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <net80211/ieee80211_superg.h>
  63 #endif
  64 #include <net80211/ieee80211_wds.h>
  65
  66 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  67
  68 static  void hostap_vattach(struct ieee80211vap *);
  69 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  70 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  71             const struct ieee80211_rx_stats *,
  72             int rssi, int nf);
  73 static void hostap_deliver_data(struct ieee80211vap *,
  74             struct ieee80211_node *, struct mbuf *);
  75 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  76             int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
  77 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  78
  79 void
  80 ieee80211_hostap_attach(struct ieee80211com *ic)
  81 {
  82         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  83 }
  84
  85 void
  86 ieee80211_hostap_detach(struct ieee80211com *ic)
  87 {
  88 }
  89
  90 static void
  91 hostap_vdetach(struct ieee80211vap *vap)
  92 {
  93 }
  94
  95 static void
  96 hostap_vattach(struct ieee80211vap *vap)
  97 {
  98         vap->iv_newstate = hostap_newstate;
  99         vap->iv_input = hostap_input;
 100         vap->iv_recv_mgmt = hostap_recv_mgmt;
 101         vap->iv_recv_ctl = hostap_recv_ctl;
 102         vap->iv_opdetach = hostap_vdetach;
 103         vap->iv_deliver_data = hostap_deliver_data;
 104         vap->iv_recv_pspoll = ieee80211_recv_pspoll;
 105 }
 106
 107 static void
 108 sta_disassoc(void *arg, struct ieee80211_node *ni)
 109 {
 110         struct ieee80211vap *vap = arg;
 111
 112         if (ni->ni_vap == vap && ni->ni_associd != 0) {
 113                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 114                         IEEE80211_REASON_ASSOC_LEAVE);
 115                 ieee80211_node_leave(ni);
 116         }
 117 }
 118
 119 static void
 120 sta_csa(void *arg, struct ieee80211_node *ni)
 121 {
 122         struct ieee80211vap *vap = arg;
 123
 124         if (ni->ni_vap == vap && ni->ni_associd != 0)
 125                 if (ni->ni_inact > vap->iv_inact_init) {
 126                         ni->ni_inact = vap->iv_inact_init;
 127                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 128                             "%s: inact %u", __func__, ni->ni_inact);
 129                 }
 130 }
 131
 132 static void
 133 sta_drop(void *arg, struct ieee80211_node *ni)
 134 {
 135         struct ieee80211vap *vap = arg;
 136
 137         if (ni->ni_vap == vap && ni->ni_associd != 0)
 138                 ieee80211_node_leave(ni);
 139 }
 140
 141 /*
 142  * Does a channel change require associated stations to re-associate
 143  * so protocol state is correct.  This is used when doing CSA across
 144  * bands or similar (e.g. HT -> legacy).
 145  */
 146 static int
 147 isbandchange(struct ieee80211com *ic)
 148 {
 149         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 150             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 151              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 152 }
 153
 154 /*
 155  * IEEE80211_M_HOSTAP vap state machine handler.
 156  */
 157 static int
 158 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 159 {
 160         struct ieee80211com *ic = vap->iv_ic;
 161         enum ieee80211_state ostate;
 162
 163         IEEE80211_LOCK_ASSERT(ic);
 164
 165         ostate = vap->iv_state;
 166         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 167             __func__, ieee80211_state_name[ostate],
 168             ieee80211_state_name[nstate], arg);
 169         vap->iv_state = nstate;                 /* state transition */
 170         if (ostate != IEEE80211_S_SCAN)
 171                 ieee80211_cancel_scan(vap);     /* background scan */
 172         switch (nstate) {
 173         case IEEE80211_S_INIT:
 174                 switch (ostate) {
 175                 case IEEE80211_S_SCAN:
 176                         ieee80211_cancel_scan(vap);
 177                         break;
 178                 case IEEE80211_S_CAC:
 179                         ieee80211_dfs_cac_stop(vap);
 180                         break;
 181                 case IEEE80211_S_RUN:
 182                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 183                         break;
 184                 default:
 185                         break;
 186                 }
 187                 if (ostate != IEEE80211_S_INIT) {
 188                         /* NB: optimize INIT -> INIT case */
 189                         ieee80211_reset_bss(vap);
 190                 }
 191                 if (vap->iv_auth->ia_detach != NULL)
 192                         vap->iv_auth->ia_detach(vap);
 193                 break;
 194         case IEEE80211_S_SCAN:
 195                 switch (ostate) {
 196                 case IEEE80211_S_CSA:
 197                 case IEEE80211_S_RUN:
 198                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
 199                         /*
 200                          * Clear overlapping BSS state; the beacon frame
 201                          * will be reconstructed on transition to the RUN
 202                          * state and the timeout routines check if the flag
 203                          * is set before doing anything so this is sufficient.
 204                          */
 205                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 206                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 207                         /* fall thru... */
 208                 case IEEE80211_S_CAC:
 209                         /*
 210                          * NB: We may get here because of a manual channel
 211                          *     change in which case we need to stop CAC
 212                          * XXX no need to stop if ostate RUN but it's ok
 213                          */
 214                         ieee80211_dfs_cac_stop(vap);
 215                         /* fall thru... */
 216                 case IEEE80211_S_INIT:
 217                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 218                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 219                                 /*
 220                                  * Already have a channel; bypass the
 221                                  * scan and startup immediately.
 222                                  * ieee80211_create_ibss will call back to
 223                                  * move us to RUN state.
 224                                  */
 225                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 226                                 break;
 227                         }
 228                         /*
 229                          * Initiate a scan.  We can come here as a result
 230                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 231                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 232                          * and the scan request parameters will be present
 233                          * in iv_scanreq.  Otherwise we do the default.
 234                          */
 235                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 236                                 ieee80211_check_scan(vap,
 237                                     vap->iv_scanreq_flags,
 238                                     vap->iv_scanreq_duration,
 239                                     vap->iv_scanreq_mindwell,
 240                                     vap->iv_scanreq_maxdwell,
 241                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 242                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 243                         } else
 244                                 ieee80211_check_scan_current(vap);
 245                         break;
 246                 case IEEE80211_S_SCAN:
 247                         /*
 248                          * A state change requires a reset; scan.
 249                          */
 250                         ieee80211_check_scan_current(vap);
 251                         break;
 252                 default:
 253                         break;
 254                 }
 255                 break;
 256         case IEEE80211_S_CAC:
 257                 /*
 258                  * Start CAC on a DFS channel.  We come here when starting
 259                  * a bss on a DFS channel (see ieee80211_create_ibss).
 260                  */
 261                 ieee80211_dfs_cac_start(vap);
 262                 break;
 263         case IEEE80211_S_RUN:
 264                 if (vap->iv_flags & IEEE80211_F_WPA) {
 265                         /* XXX validate prerequisites */
 266                 }
 267                 switch (ostate) {
 268                 case IEEE80211_S_INIT:
 269                         /*
 270                          * Already have a channel; bypass the
 271                          * scan and startup immediately.
 272                          * Note that ieee80211_create_ibss will call
 273                          * back to do a RUN->RUN state change.
 274                          */
 275                         ieee80211_create_ibss(vap,
 276                             ieee80211_ht_adjust_channel(ic,
 277                                 ic->ic_curchan, vap->iv_flags_ht));
 278                         /* NB: iv_bss is changed on return */
 279                         break;
 280                 case IEEE80211_S_CAC:
 281                         /*
 282                          * NB: This is the normal state change when CAC
 283                          * expires and no radar was detected; no need to
 284                          * clear the CAC timer as it's already expired.
 285                          */
 286                         /* fall thru... */
 287                 case IEEE80211_S_CSA:
 288                         /*
 289                          * Shorten inactivity timer of associated stations
 290                          * to weed out sta's that don't follow a CSA.
 291                          */
 292                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
 293                         /*
 294                          * Update bss node channel to reflect where
 295                          * we landed after CSA.
 296                          */
 297                         ieee80211_node_set_chan(vap->iv_bss,
 298                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
 299                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
 300                         /* XXX bypass debug msgs */
 301                         break;
 302                 case IEEE80211_S_SCAN:
 303                 case IEEE80211_S_RUN:
 304 #ifdef IEEE80211_DEBUG
 305                         if (ieee80211_msg_debug(vap)) {
 306                                 struct ieee80211_node *ni = vap->iv_bss;
 307                                 ieee80211_note(vap,
 308                                     "synchronized with %s ssid ",
 309                                     ether_sprintf(ni->ni_bssid));
 310                                 ieee80211_print_essid(ni->ni_essid,
 311                                     ni->ni_esslen);
 312                                 /* XXX MCS/HT */
 313                                 printf(" channel %d start %uMb\n",
 314                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 315                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 316                         }
 317 #endif
 318                         break;
 319                 default:
 320                         break;
 321                 }
 322                 /*
 323                  * Start/stop the authenticator.  We delay until here
 324                  * to allow configuration to happen out of order.
 325                  */
 326                 if (vap->iv_auth->ia_attach != NULL) {
 327                         /* XXX check failure */
 328                         vap->iv_auth->ia_attach(vap);
 329                 } else if (vap->iv_auth->ia_detach != NULL) {
 330                         vap->iv_auth->ia_detach(vap);
 331                 }
 332                 ieee80211_node_authorize(vap->iv_bss);
 333                 break;
 334         case IEEE80211_S_CSA:
 335                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
 336                         /*
 337                          * On a ``band change'' silently drop associated
 338                          * stations as they must re-associate before they
 339                          * can pass traffic (as otherwise protocol state
 340                          * such as capabilities and the negotiated rate
 341                          * set may/will be wrong).
 342                          */
 343                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
 344                 }
 345                 break;
 346         default:
 347                 break;
 348         }
 349         return 0;
 350 }
 351
 352 static void
 353 hostap_deliver_data(struct ieee80211vap *vap,
 354         struct ieee80211_node *ni, struct mbuf *m)
 355 {
 356         struct ether_header *eh = mtod(m, struct ether_header *);
 357         struct ifnet *ifp = vap->iv_ifp;
 358
 359         /* clear driver/net80211 flags before passing up */
 360         m->m_flags &= ~(M_MCAST | M_BCAST);
 361         m_clrprotoflags(m);
 362
 363         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
 364             ("gack, opmode %d", vap->iv_opmode));
 365         /*
 366          * Do accounting.
 367          */
 368         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 369         IEEE80211_NODE_STAT(ni, rx_data);
 370         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 371         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 372                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
 373                 IEEE80211_NODE_STAT(ni, rx_mcast);
 374         } else
 375                 IEEE80211_NODE_STAT(ni, rx_ucast);
 376
 377         /* perform as a bridge within the AP */
 378         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
 379                 struct mbuf *mcopy = NULL;
 380
 381                 if (m->m_flags & M_MCAST) {
 382                         mcopy = m_dup(m, M_NOWAIT);
 383                         if (mcopy == NULL)
 384                                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 385                         else
 386                                 mcopy->m_flags |= M_MCAST;
 387                 } else {
 388                         /*
 389                          * Check if the destination is associated with the
 390                          * same vap and authorized to receive traffic.
 391                          * Beware of traffic destined for the vap itself;
 392                          * sending it will not work; just let it be delivered
 393                          * normally.
 394                          */
 395                         struct ieee80211_node *sta = ieee80211_find_vap_node(
 396                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
 397                         if (sta != NULL) {
 398                                 if (ieee80211_node_is_authorized(sta)) {
 399                                         /*
 400                                          * Beware of sending to ourself; this
 401                                          * needs to happen via the normal
 402                                          * input path.
 403                                          */
 404                                         if (sta != vap->iv_bss) {
 405                                                 mcopy = m;
 406                                                 m = NULL;
 407                                         }
 408                                 } else {
 409                                         vap->iv_stats.is_rx_unauth++;
 410                                         IEEE80211_NODE_STAT(sta, rx_unauth);
 411                                 }
 412                                 ieee80211_free_node(sta);
 413                         }
 414                 }
 415                 if (mcopy != NULL)
 416                         (void) ieee80211_vap_xmitpkt(vap, mcopy);
 417         }
 418         if (m != NULL) {
 419                 /*
 420                  * Mark frame as coming from vap's interface.
 421                  */
 422                 m->m_pkthdr.rcvif = ifp;
 423                 if (m->m_flags & M_MCAST) {
 424                         /*
 425                          * Spam DWDS vap's w/ multicast traffic.
 426                          */
 427                         /* XXX only if dwds in use? */
 428                         ieee80211_dwds_mcast(vap, m);
 429                 }
 430                 if (ni->ni_vlan != 0) {
 431                         /* attach vlan tag */
 432                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
 433                         m->m_flags |= M_VLANTAG;
 434                 }
 435                 ifp->if_input(ifp, m);
 436         }
 437 }
 438
 439 /*
 440  * Decide if a received management frame should be
 441  * printed when debugging is enabled.  This filters some
 442  * of the less interesting frames that come frequently
 443  * (e.g. beacons).
 444  */
 445 static __inline int
 446 doprint(struct ieee80211vap *vap, int subtype)
 447 {
 448         switch (subtype) {
 449         case IEEE80211_FC0_SUBTYPE_BEACON:
 450                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 451         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 452                 return 0;
 453         }
 454         return 1;
 455 }
 456
 457 /*
 458  * Process a received frame.  The node associated with the sender
 459  * should be supplied.  If nothing was found in the node table then
 460  * the caller is assumed to supply a reference to iv_bss instead.
 461  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 462  * during AP scanning to select a AP to associate with; it can have
 463  * any units so long as values have consistent units and higher values
 464  * mean ``better signal''.  The receive timestamp is currently not used
 465  * by the 802.11 layer.
 466  */
 467 static int
 468 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
 469     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 470 {
 471         struct ieee80211vap *vap = ni->ni_vap;
 472         struct ieee80211com *ic = ni->ni_ic;
 473         struct ifnet *ifp = vap->iv_ifp;
 474         struct ieee80211_frame *wh;
 475         struct ieee80211_key *key;
 476         struct ether_header *eh;
 477         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 478         uint8_t dir, type, subtype, qos;
 479         uint8_t *bssid;
 480
 481         if (m->m_flags & M_AMPDU_MPDU) {
 482                 /*
 483                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 484                  * w/ M_AMPDU_MPDU marked have already passed through
 485                  * here but were received out of order and been held on
 486                  * the reorder queue.  When resubmitted they are marked
 487                  * with the M_AMPDU_MPDU flag and we can bypass most of
 488                  * the normal processing.
 489                  */
 490                 wh = mtod(m, struct ieee80211_frame *);
 491                 type = IEEE80211_FC0_TYPE_DATA;
 492                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 493                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 494                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 495                 goto resubmit_ampdu;
 496         }
 497
 498         KASSERT(ni != NULL, ("null node"));
 499         ni->ni_inact = ni->ni_inact_reload;
 500
 501         type = -1;                      /* undefined */
 502
 503         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 504                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 505                     ni->ni_macaddr, NULL,
 506                     "too short (1): len %u", m->m_pkthdr.len);
 507                 vap->iv_stats.is_rx_tooshort++;
 508                 goto out;
 509         }
 510         /*
 511          * Bit of a cheat here, we use a pointer for a 3-address
 512          * frame format but don't reference fields past outside
 513          * ieee80211_frame_min w/o first validating the data is
 514          * present.
 515          */
 516         wh = mtod(m, struct ieee80211_frame *);
 517
 518         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 519             IEEE80211_FC0_VERSION_0) {
 520                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 521                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 522                     wh->i_fc[0], wh->i_fc[1]);
 523                 vap->iv_stats.is_rx_badversion++;
 524                 goto err;
 525         }
 526
 527         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 528         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 529         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 530         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 531                 if (dir != IEEE80211_FC1_DIR_NODS)
 532                         bssid = wh->i_addr1;
 533                 else if (type == IEEE80211_FC0_TYPE_CTL)
 534                         bssid = wh->i_addr1;
 535                 else {
 536                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 537                                 IEEE80211_DISCARD_MAC(vap,
 538                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 539                                     NULL, "too short (2): len %u",
 540                                     m->m_pkthdr.len);
 541                                 vap->iv_stats.is_rx_tooshort++;
 542                                 goto out;
 543                         }
 544                         bssid = wh->i_addr3;
 545                 }
 546                 /*
 547                  * Validate the bssid.
 548                  */
 549                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 550                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 551                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 552                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 553                         /* not interested in */
 554                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 555                             bssid, NULL, "%s", "not to bss");
 556                         vap->iv_stats.is_rx_wrongbss++;
 557                         goto out;
 558                 }
 559
 560                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 561                 ni->ni_noise = nf;
 562                 if (IEEE80211_HAS_SEQ(type, subtype)) {
 563                         uint8_t tid = ieee80211_gettid(wh);
 564                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 565                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 566                                 ic->ic_wme.wme_hipri_traffic++;
 567                         if (! ieee80211_check_rxseq(ni, wh, bssid))
 568                                 goto out;
 569                 }
 570         }
 571
 572         switch (type) {
 573         case IEEE80211_FC0_TYPE_DATA:
 574                 hdrspace = ieee80211_hdrspace(ic, wh);
 575                 if (m->m_len < hdrspace &&
 576                     (m = m_pullup(m, hdrspace)) == NULL) {
 577                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 578                             ni->ni_macaddr, NULL,
 579                             "data too short: expecting %u", hdrspace);
 580                         vap->iv_stats.is_rx_tooshort++;
 581                         goto out;               /* XXX */
 582                 }
 583                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 584                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 585                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 586                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 587                                 IEEE80211_DISCARD(vap,
 588                                     IEEE80211_MSG_INPUT, wh, "data",
 589                                     "incorrect dir 0x%x", dir);
 590                         } else {
 591                                 IEEE80211_DISCARD(vap,
 592                                     IEEE80211_MSG_INPUT |
 593                                     IEEE80211_MSG_WDS, wh,
 594                                     "4-address data",
 595                                     "%s", "DWDS not enabled");
 596                         }
 597                         vap->iv_stats.is_rx_wrongdir++;
 598                         goto out;
 599                 }
 600                 /* check if source STA is associated */
 601                 if (ni == vap->iv_bss) {
 602                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 603                             wh, "data", "%s", "unknown src");
 604                         ieee80211_send_error(ni, wh->i_addr2,
 605                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 606                             IEEE80211_REASON_NOT_AUTHED);
 607                         vap->iv_stats.is_rx_notassoc++;
 608                         goto err;
 609                 }
 610                 if (ni->ni_associd == 0) {
 611                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 612                             wh, "data", "%s", "unassoc src");
 613                         IEEE80211_SEND_MGMT(ni,
 614                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 615                             IEEE80211_REASON_NOT_ASSOCED);
 616                         vap->iv_stats.is_rx_notassoc++;
 617                         goto err;
 618                 }
 619
 620                 /*
 621                  * Check for power save state change.
 622                  * XXX out-of-order A-MPDU frames?
 623                  */
 624                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 625                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 626                         vap->iv_node_ps(ni,
 627                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 628                 /*
 629                  * For 4-address packets handle WDS discovery
 630                  * notifications.  Once a WDS link is setup frames
 631                  * are just delivered to the WDS vap (see below).
 632                  */
 633                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 634                         if (!ieee80211_node_is_authorized(ni)) {
 635                                 IEEE80211_DISCARD(vap,
 636                                     IEEE80211_MSG_INPUT |
 637                                     IEEE80211_MSG_WDS, wh,
 638                                     "4-address data",
 639                                     "%s", "unauthorized port");
 640                                 vap->iv_stats.is_rx_unauth++;
 641                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 642                                 goto err;
 643                         }
 644                         ieee80211_dwds_discover(ni, m);
 645                         return type;
 646                 }
 647
 648                 /*
 649                  * Handle A-MPDU re-ordering.  If the frame is to be
 650                  * processed directly then ieee80211_ampdu_reorder
 651                  * will return 0; otherwise it has consumed the mbuf
 652                  * and we should do nothing more with it.
 653                  */
 654                 if ((m->m_flags & M_AMPDU) &&
 655                     ieee80211_ampdu_reorder(ni, m) != 0) {
 656                         m = NULL;
 657                         goto out;
 658                 }
 659         resubmit_ampdu:
 660
 661                 /*
 662                  * Handle privacy requirements.  Note that we
 663                  * must not be preempted from here until after
 664                  * we (potentially) call ieee80211_crypto_demic;
 665                  * otherwise we may violate assumptions in the
 666                  * crypto cipher modules used to do delayed update
 667                  * of replay sequence numbers.
 668                  */
 669                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 670                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 671                                 /*
 672                                  * Discard encrypted frames when privacy is off.
 673                                  */
 674                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 675                                     wh, "WEP", "%s", "PRIVACY off");
 676                                 vap->iv_stats.is_rx_noprivacy++;
 677                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 678                                 goto out;
 679                         }
 680                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 681                         if (key == NULL) {
 682                                 /* NB: stats+msgs handled in crypto_decap */
 683                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 684                                 goto out;
 685                         }
 686                         wh = mtod(m, struct ieee80211_frame *);
 687                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 688                 } else {
 689                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 690                         key = NULL;
 691                 }
 692
 693                 /*
 694                  * Save QoS bits for use below--before we strip the header.
 695                  */
 696                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 697                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 698                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 699                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 700                 } else
 701                         qos = 0;
 702
 703                 /*
 704                  * Next up, any fragmentation.
 705                  */
 706                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 707                         m = ieee80211_defrag(ni, m, hdrspace);
 708                         if (m == NULL) {
 709                                 /* Fragment dropped or frame not complete yet */
 710                                 goto out;
 711                         }
 712                 }
 713                 wh = NULL;              /* no longer valid, catch any uses */
 714
 715                 /*
 716                  * Next strip any MSDU crypto bits.
 717                  */
 718                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 719                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 720                             ni->ni_macaddr, "data", "%s", "demic error");
 721                         vap->iv_stats.is_rx_demicfail++;
 722                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 723                         goto out;
 724                 }
 725                 /* copy to listener after decrypt */
 726                 if (ieee80211_radiotap_active_vap(vap))
 727                         ieee80211_radiotap_rx(vap, m);
 728                 need_tap = 0;
 729                 /*
 730                  * Finally, strip the 802.11 header.
 731                  */
 732                 m = ieee80211_decap(vap, m, hdrspace);
 733                 if (m == NULL) {
 734                         /* XXX mask bit to check for both */
 735                         /* don't count Null data frames as errors */
 736                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 737                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 738                                 goto out;
 739                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 740                             ni->ni_macaddr, "data", "%s", "decap error");
 741                         vap->iv_stats.is_rx_decap++;
 742                         IEEE80211_NODE_STAT(ni, rx_decap);
 743                         goto err;
 744                 }
 745                 eh = mtod(m, struct ether_header *);
 746                 if (!ieee80211_node_is_authorized(ni)) {
 747                         /*
 748                          * Deny any non-PAE frames received prior to
 749                          * authorization.  For open/shared-key
 750                          * authentication the port is mark authorized
 751                          * after authentication completes.  For 802.1x
 752                          * the port is not marked authorized by the
 753                          * authenticator until the handshake has completed.
 754                          */
 755                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 756                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 757                                     eh->ether_shost, "data",
 758                                     "unauthorized port: ether type 0x%x len %u",
 759                                     eh->ether_type, m->m_pkthdr.len);
 760                                 vap->iv_stats.is_rx_unauth++;
 761                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 762                                 goto err;
 763                         }
 764                 } else {
 765                         /*
 766                          * When denying unencrypted frames, discard
 767                          * any non-PAE frames received without encryption.
 768                          */
 769                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 770                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 771                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 772                                 /*
 773                                  * Drop unencrypted frames.
 774                                  */
 775                                 vap->iv_stats.is_rx_unencrypted++;
 776                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 777                                 goto out;
 778                         }
 779                 }
 780                 /* XXX require HT? */
 781                 if (qos & IEEE80211_QOS_AMSDU) {
 782                         m = ieee80211_decap_amsdu(ni, m);
 783                         if (m == NULL)
 784                                 return IEEE80211_FC0_TYPE_DATA;
 785                 } else {
 786 #ifdef IEEE80211_SUPPORT_SUPERG
 787                         m = ieee80211_decap_fastframe(vap, ni, m);
 788                         if (m == NULL)
 789                                 return IEEE80211_FC0_TYPE_DATA;
 790 #endif
 791                 }
 792                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 793                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 794                 else
 795                         hostap_deliver_data(vap, ni, m);
 796                 return IEEE80211_FC0_TYPE_DATA;
 797
 798         case IEEE80211_FC0_TYPE_MGT:
 799                 vap->iv_stats.is_rx_mgmt++;
 800                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 801                 if (dir != IEEE80211_FC1_DIR_NODS) {
 802                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 803                             wh, "mgt", "incorrect dir 0x%x", dir);
 804                         vap->iv_stats.is_rx_wrongdir++;
 805                         goto err;
 806                 }
 807                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 808                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 809                             ni->ni_macaddr, "mgt", "too short: len %u",
 810                             m->m_pkthdr.len);
 811                         vap->iv_stats.is_rx_tooshort++;
 812                         goto out;
 813                 }
 814                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 815                         /* ensure return frames are unicast */
 816                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 817                             wh, NULL, "source is multicast: %s",
 818                             ether_sprintf(wh->i_addr2));
 819                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 820                         goto out;
 821                 }
 822 #ifdef IEEE80211_DEBUG
 823                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 824                     ieee80211_msg_dumppkts(vap)) {
 825                         if_printf(ifp, "received %s from %s rssi %d\n",
 826                             ieee80211_mgt_subtype_name(subtype),
 827                             ether_sprintf(wh->i_addr2), rssi);
 828                 }
 829 #endif
 830                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 831                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 832                                 /*
 833                                  * Only shared key auth frames with a challenge
 834                                  * should be encrypted, discard all others.
 835                                  */
 836                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 837                                     wh, NULL,
 838                                     "%s", "WEP set but not permitted");
 839                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 840                                 goto out;
 841                         }
 842                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 843                                 /*
 844                                  * Discard encrypted frames when privacy is off.
 845                                  */
 846                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 847                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 848                                 vap->iv_stats.is_rx_noprivacy++;
 849                                 goto out;
 850                         }
 851                         hdrspace = ieee80211_hdrspace(ic, wh);
 852                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 853                         if (key == NULL) {
 854                                 /* NB: stats+msgs handled in crypto_decap */
 855                                 goto out;
 856                         }
 857                         wh = mtod(m, struct ieee80211_frame *);
 858                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 859                 }
 860                 /*
 861                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 862                  * Otherwise iv_recv_mgmt() might pass another packet to
 863                  * radiotap, resulting in out of order packet captures.
 864                  */
 865                 if (ieee80211_radiotap_active_vap(vap))
 866                         ieee80211_radiotap_rx(vap, m);
 867                 need_tap = 0;
 868                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 869                 goto out;
 870
 871         case IEEE80211_FC0_TYPE_CTL:
 872                 vap->iv_stats.is_rx_ctl++;
 873                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 874                 vap->iv_recv_ctl(ni, m, subtype);
 875                 goto out;
 876         default:
 877                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 878                     wh, "bad", "frame type 0x%x", type);
 879                 /* should not come here */
 880                 break;
 881         }
 882 err:
 883         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 884 out:
 885         if (m != NULL) {
 886                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 887                         ieee80211_radiotap_rx(vap, m);
 888                 m_freem(m);
 889         }
 890         return type;
 891 }
 892
 893 static void
 894 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 895     int rssi, int nf, uint16_t seq, uint16_t status)
 896 {
 897         struct ieee80211vap *vap = ni->ni_vap;
 898
 899         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 900
 901         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 902                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 903                     ni->ni_macaddr, "open auth",
 904                     "bad sta auth mode %u", ni->ni_authmode);
 905                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 906                 /*
 907                  * Clear any challenge text that may be there if
 908                  * a previous shared key auth failed and then an
 909                  * open auth is attempted.
 910                  */
 911                 if (ni->ni_challenge != NULL) {
 912                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
 913                         ni->ni_challenge = NULL;
 914                 }
 915                 /* XXX hack to workaround calling convention */
 916                 ieee80211_send_error(ni, wh->i_addr2,
 917                     IEEE80211_FC0_SUBTYPE_AUTH,
 918                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 919                 return;
 920         }
 921         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 922                 vap->iv_stats.is_rx_bad_auth++;
 923                 return;
 924         }
 925         /* always accept open authentication requests */
 926         if (ni == vap->iv_bss) {
 927                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 928                 if (ni == NULL)
 929                         return;
 930         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 931                 (void) ieee80211_ref_node(ni);
 932         /*
 933          * Mark the node as referenced to reflect that it's
 934          * reference count has been bumped to insure it remains
 935          * after the transaction completes.
 936          */
 937         ni->ni_flags |= IEEE80211_NODE_AREF;
 938         /*
 939          * Mark the node as requiring a valid association id
 940          * before outbound traffic is permitted.
 941          */
 942         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 943
 944         if (vap->iv_acl != NULL &&
 945             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 946                 /*
 947                  * When the ACL policy is set to RADIUS we defer the
 948                  * authorization to a user agent.  Dispatch an event,
 949                  * a subsequent MLME call will decide the fate of the
 950                  * station.  If the user agent is not present then the
 951                  * node will be reclaimed due to inactivity.
 952                  */
 953                 IEEE80211_NOTE_MAC(vap,
 954                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 955                     "%s", "station authentication defered (radius acl)");
 956                 ieee80211_notify_node_auth(ni);
 957         } else {
 958                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 959                 IEEE80211_NOTE_MAC(vap,
 960                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 961                     "%s", "station authenticated (open)");
 962                 /*
 963                  * When 802.1x is not in use mark the port
 964                  * authorized at this point so traffic can flow.
 965                  */
 966                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 967                         ieee80211_node_authorize(ni);
 968         }
 969 }
 970
 971 static void
 972 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 973     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 974     uint16_t seq, uint16_t status)
 975 {
 976         struct ieee80211vap *vap = ni->ni_vap;
 977         uint8_t *challenge;
 978         int allocbs, estatus;
 979
 980         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 981
 982         /*
 983          * NB: this can happen as we allow pre-shared key
 984          * authentication to be enabled w/o wep being turned
 985          * on so that configuration of these can be done
 986          * in any order.  It may be better to enforce the
 987          * ordering in which case this check would just be
 988          * for sanity/consistency.
 989          */
 990         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 991                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 992                     ni->ni_macaddr, "shared key auth",
 993                     "%s", " PRIVACY is disabled");
 994                 estatus = IEEE80211_STATUS_ALG;
 995                 goto bad;
 996         }
 997         /*
 998          * Pre-shared key authentication is evil; accept
 999          * it only if explicitly configured (it is supported
1000          * mainly for compatibility with clients like Mac OS X).
1001          */
1002         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1003             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1004                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1005                     ni->ni_macaddr, "shared key auth",
1006                     "bad sta auth mode %u", ni->ni_authmode);
1007                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1008                 estatus = IEEE80211_STATUS_ALG;
1009                 goto bad;
1010         }
1011
1012         challenge = NULL;
1013         if (frm + 1 < efrm) {
1014                 if ((frm[1] + 2) > (efrm - frm)) {
1015                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1016                             ni->ni_macaddr, "shared key auth",
1017                             "ie %d/%d too long",
1018                             frm[0], (frm[1] + 2) - (efrm - frm));
1019                         vap->iv_stats.is_rx_bad_auth++;
1020                         estatus = IEEE80211_STATUS_CHALLENGE;
1021                         goto bad;
1022                 }
1023                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1024                         challenge = frm;
1025                 frm += frm[1] + 2;
1026         }
1027         switch (seq) {
1028         case IEEE80211_AUTH_SHARED_CHALLENGE:
1029         case IEEE80211_AUTH_SHARED_RESPONSE:
1030                 if (challenge == NULL) {
1031                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1032                             ni->ni_macaddr, "shared key auth",
1033                             "%s", "no challenge");
1034                         vap->iv_stats.is_rx_bad_auth++;
1035                         estatus = IEEE80211_STATUS_CHALLENGE;
1036                         goto bad;
1037                 }
1038                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1039                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1040                             ni->ni_macaddr, "shared key auth",
1041                             "bad challenge len %d", challenge[1]);
1042                         vap->iv_stats.is_rx_bad_auth++;
1043                         estatus = IEEE80211_STATUS_CHALLENGE;
1044                         goto bad;
1045                 }
1046         default:
1047                 break;
1048         }
1049         switch (seq) {
1050         case IEEE80211_AUTH_SHARED_REQUEST:
1051                 if (ni == vap->iv_bss) {
1052                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1053                         if (ni == NULL) {
1054                                 /* NB: no way to return an error */
1055                                 return;
1056                         }
1057                         allocbs = 1;
1058                 } else {
1059                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1060                                 (void) ieee80211_ref_node(ni);
1061                         allocbs = 0;
1062                 }
1063                 /*
1064                  * Mark the node as referenced to reflect that it's
1065                  * reference count has been bumped to insure it remains
1066                  * after the transaction completes.
1067                  */
1068                 ni->ni_flags |= IEEE80211_NODE_AREF;
1069                 /*
1070                  * Mark the node as requiring a valid association id
1071                  * before outbound traffic is permitted.
1072                  */
1073                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1074                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1075                 ni->ni_noise = nf;
1076                 if (!ieee80211_alloc_challenge(ni)) {
1077                         /* NB: don't return error so they rexmit */
1078                         return;
1079                 }
1080                 get_random_bytes(ni->ni_challenge,
1081                         IEEE80211_CHALLENGE_LEN);
1082                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1083                     ni, "shared key %sauth request", allocbs ? "" : "re");
1084                 /*
1085                  * When the ACL policy is set to RADIUS we defer the
1086                  * authorization to a user agent.  Dispatch an event,
1087                  * a subsequent MLME call will decide the fate of the
1088                  * station.  If the user agent is not present then the
1089                  * node will be reclaimed due to inactivity.
1090                  */
1091                 if (vap->iv_acl != NULL &&
1092                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1093                         IEEE80211_NOTE_MAC(vap,
1094                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1095                             ni->ni_macaddr,
1096                             "%s", "station authentication defered (radius acl)");
1097                         ieee80211_notify_node_auth(ni);
1098                         return;
1099                 }
1100                 break;
1101         case IEEE80211_AUTH_SHARED_RESPONSE:
1102                 if (ni == vap->iv_bss) {
1103                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1104                             ni->ni_macaddr, "shared key response",
1105                             "%s", "unknown station");
1106                         /* NB: don't send a response */
1107                         return;
1108                 }
1109                 if (ni->ni_challenge == NULL) {
1110                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1111                             ni->ni_macaddr, "shared key response",
1112                             "%s", "no challenge recorded");
1113                         vap->iv_stats.is_rx_bad_auth++;
1114                         estatus = IEEE80211_STATUS_CHALLENGE;
1115                         goto bad;
1116                 }
1117                 if (memcmp(ni->ni_challenge, &challenge[2],
1118                            challenge[1]) != 0) {
1119                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1120                             ni->ni_macaddr, "shared key response",
1121                             "%s", "challenge mismatch");
1122                         vap->iv_stats.is_rx_auth_fail++;
1123                         estatus = IEEE80211_STATUS_CHALLENGE;
1124                         goto bad;
1125                 }
1126                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1127                     ni, "%s", "station authenticated (shared key)");
1128                 ieee80211_node_authorize(ni);
1129                 break;
1130         default:
1131                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1132                     ni->ni_macaddr, "shared key auth",
1133                     "bad seq %d", seq);
1134                 vap->iv_stats.is_rx_bad_auth++;
1135                 estatus = IEEE80211_STATUS_SEQUENCE;
1136                 goto bad;
1137         }
1138         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1139         return;
1140 bad:
1141         /*
1142          * Send an error response; but only when operating as an AP.
1143          */
1144         /* XXX hack to workaround calling convention */
1145         ieee80211_send_error(ni, wh->i_addr2,
1146             IEEE80211_FC0_SUBTYPE_AUTH,
1147             (seq + 1) | (estatus<<16));
1148 }
1149
1150 /*
1151  * Convert a WPA cipher selector OUI to an internal
1152  * cipher algorithm.  Where appropriate we also
1153  * record any key length.
1154  */
1155 static int
1156 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1157 {
1158 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1159         uint32_t w = le32dec(sel);
1160
1161         switch (w) {
1162         case WPA_SEL(WPA_CSE_NULL):
1163                 *cipher = IEEE80211_CIPHER_NONE;
1164                 break;
1165         case WPA_SEL(WPA_CSE_WEP40):
1166                 if (keylen)
1167                         *keylen = 40 / NBBY;
1168                 *cipher = IEEE80211_CIPHER_WEP;
1169                 break;
1170         case WPA_SEL(WPA_CSE_WEP104):
1171                 if (keylen)
1172                         *keylen = 104 / NBBY;
1173                 *cipher = IEEE80211_CIPHER_WEP;
1174                 break;
1175         case WPA_SEL(WPA_CSE_TKIP):
1176                 *cipher = IEEE80211_CIPHER_TKIP;
1177                 break;
1178         case WPA_SEL(WPA_CSE_CCMP):
1179                 *cipher = IEEE80211_CIPHER_AES_CCM;
1180                 break;
1181         default:
1182                 return (EINVAL);
1183         }
1184
1185         return (0);
1186 #undef WPA_SEL
1187 }
1188
1189 /*
1190  * Convert a WPA key management/authentication algorithm
1191  * to an internal code.
1192  */
1193 static int
1194 wpa_keymgmt(const uint8_t *sel)
1195 {
1196 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1197         uint32_t w = le32dec(sel);
1198
1199         switch (w) {
1200         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1201                 return WPA_ASE_8021X_UNSPEC;
1202         case WPA_SEL(WPA_ASE_8021X_PSK):
1203                 return WPA_ASE_8021X_PSK;
1204         case WPA_SEL(WPA_ASE_NONE):
1205                 return WPA_ASE_NONE;
1206         }
1207         return 0;               /* NB: so is discarded */
1208 #undef WPA_SEL
1209 }
1210
1211 /*
1212  * Parse a WPA information element to collect parameters.
1213  * Note that we do not validate security parameters; that
1214  * is handled by the authenticator; the parsing done here
1215  * is just for internal use in making operational decisions.
1216  */
1217 static int
1218 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1219         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1220 {
1221         uint8_t len = frm[1];
1222         uint32_t w;
1223         int error, n;
1224
1225         /*
1226          * Check the length once for fixed parts: OUI, type,
1227          * version, mcast cipher, and 2 selector counts.
1228          * Other, variable-length data, must be checked separately.
1229          */
1230         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1231                 IEEE80211_DISCARD_IE(vap,
1232                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1233                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1234                 return IEEE80211_REASON_IE_INVALID;
1235         }
1236         if (len < 14) {
1237                 IEEE80211_DISCARD_IE(vap,
1238                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1239                     wh, "WPA", "too short, len %u", len);
1240                 return IEEE80211_REASON_IE_INVALID;
1241         }
1242         frm += 6, len -= 4;             /* NB: len is payload only */
1243         /* NB: iswpaoui already validated the OUI and type */
1244         w = le16dec(frm);
1245         if (w != WPA_VERSION) {
1246                 IEEE80211_DISCARD_IE(vap,
1247                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1248                     wh, "WPA", "bad version %u", w);
1249                 return IEEE80211_REASON_IE_INVALID;
1250         }
1251         frm += 2, len -= 2;
1252
1253         memset(rsn, 0, sizeof(*rsn));
1254
1255         /* multicast/group cipher */
1256         error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1257         if (error != 0) {
1258                 IEEE80211_DISCARD_IE(vap,
1259                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1260                     wh, "WPA", "unknown mcast cipher suite %08X",
1261                     le32dec(frm));
1262                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1263         }
1264         frm += 4, len -= 4;
1265
1266         /* unicast ciphers */
1267         n = le16dec(frm);
1268         frm += 2, len -= 2;
1269         if (len < n*4+2) {
1270                 IEEE80211_DISCARD_IE(vap,
1271                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1272                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1273                     len, n);
1274                 return IEEE80211_REASON_IE_INVALID;
1275         }
1276         w = 0;
1277         for (; n > 0; n--) {
1278                 uint8_t cipher;
1279
1280                 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1281                 if (error == 0)
1282                         w |= 1 << cipher;
1283
1284                 frm += 4, len -= 4;
1285         }
1286         if (w == 0) {
1287                 IEEE80211_DISCARD_IE(vap,
1288                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1289                     wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1290                     w);
1291                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1292         }
1293         /* XXX other? */
1294         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1295                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1296         else
1297                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1298
1299         /* key management algorithms */
1300         n = le16dec(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 = le16dec(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, uint8_t *cipher)
1332 {
1333 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1334         uint32_t w = le32dec(sel);
1335
1336         switch (w) {
1337         case RSN_SEL(RSN_CSE_NULL):
1338                 *cipher = IEEE80211_CIPHER_NONE;
1339                 break;
1340         case RSN_SEL(RSN_CSE_WEP40):
1341                 if (keylen)
1342                         *keylen = 40 / NBBY;
1343                 *cipher = IEEE80211_CIPHER_WEP;
1344                 break;
1345         case RSN_SEL(RSN_CSE_WEP104):
1346                 if (keylen)
1347                         *keylen = 104 / NBBY;
1348                 *cipher = IEEE80211_CIPHER_WEP;
1349                 break;
1350         case RSN_SEL(RSN_CSE_TKIP):
1351                 *cipher = IEEE80211_CIPHER_TKIP;
1352                 break;
1353         case RSN_SEL(RSN_CSE_CCMP):
1354                 *cipher = IEEE80211_CIPHER_AES_CCM;
1355                 break;
1356         case RSN_SEL(RSN_CSE_WRAP):
1357                 *cipher = IEEE80211_CIPHER_AES_OCB;
1358                 break;
1359         default:
1360                 return (EINVAL);
1361         }
1362
1363         return (0);
1364 #undef WPA_SEL
1365 }
1366
1367 /*
1368  * Convert an RSN key management/authentication algorithm
1369  * to an internal code.
1370  */
1371 static int
1372 rsn_keymgmt(const uint8_t *sel)
1373 {
1374 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1375         uint32_t w = le32dec(sel);
1376
1377         switch (w) {
1378         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1379                 return RSN_ASE_8021X_UNSPEC;
1380         case RSN_SEL(RSN_ASE_8021X_PSK):
1381                 return RSN_ASE_8021X_PSK;
1382         case RSN_SEL(RSN_ASE_NONE):
1383                 return RSN_ASE_NONE;
1384         }
1385         return 0;               /* NB: so is discarded */
1386 #undef RSN_SEL
1387 }
1388
1389 /*
1390  * Parse a WPA/RSN information element to collect parameters
1391  * and validate the parameters against what has been
1392  * configured for the system.
1393  */
1394 static int
1395 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1396         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1397 {
1398         uint8_t len = frm[1];
1399         uint32_t w;
1400         int error, n;
1401
1402         /*
1403          * Check the length once for fixed parts:
1404          * version, mcast cipher, and 2 selector counts.
1405          * Other, variable-length data, must be checked separately.
1406          */
1407         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1408                 IEEE80211_DISCARD_IE(vap,
1409                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1410                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1411                 return IEEE80211_REASON_IE_INVALID;
1412         }
1413         /* XXX may be shorter */
1414         if (len < 10) {
1415                 IEEE80211_DISCARD_IE(vap,
1416                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1417                     wh, "RSN", "too short, len %u", len);
1418                 return IEEE80211_REASON_IE_INVALID;
1419         }
1420         frm += 2;
1421         w = le16dec(frm);
1422         if (w != RSN_VERSION) {
1423                 IEEE80211_DISCARD_IE(vap,
1424                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1425                     wh, "RSN", "bad version %u", w);
1426                 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1427         }
1428         frm += 2, len -= 2;
1429
1430         memset(rsn, 0, sizeof(*rsn));
1431
1432         /* multicast/group cipher */
1433         error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1434         if (error != 0) {
1435                 IEEE80211_DISCARD_IE(vap,
1436                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1437                     wh, "RSN", "unknown mcast cipher suite %08X",
1438                     le32dec(frm));
1439                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1440         }
1441         if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1442                 IEEE80211_DISCARD_IE(vap,
1443                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1444                     wh, "RSN", "invalid mcast cipher suite %d",
1445                     rsn->rsn_mcastcipher);
1446                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1447         }
1448         frm += 4, len -= 4;
1449
1450         /* unicast ciphers */
1451         n = le16dec(frm);
1452         frm += 2, len -= 2;
1453         if (len < n*4+2) {
1454                 IEEE80211_DISCARD_IE(vap,
1455                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1456                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1457                     len, n);
1458                 return IEEE80211_REASON_IE_INVALID;
1459         }
1460         w = 0;
1461
1462         for (; n > 0; n--) {
1463                 uint8_t cipher;
1464
1465                 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1466                 if (error == 0)
1467                         w |= 1 << cipher;
1468
1469                 frm += 4, len -= 4;
1470         }
1471         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1472                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1473         else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1474                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1475         else if (w & (1 << IEEE80211_CIPHER_TKIP))
1476                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1477         else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1478             (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1479              rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1480                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1481         else {
1482                 IEEE80211_DISCARD_IE(vap,
1483                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1484                     wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1485                     w);
1486                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1487         }
1488
1489         /* key management algorithms */
1490         n = le16dec(frm);
1491         frm += 2, len -= 2;
1492         if (len < n*4) {
1493                 IEEE80211_DISCARD_IE(vap,
1494                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1495                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1496                     len, n);
1497                 return IEEE80211_REASON_IE_INVALID;
1498         }
1499         w = 0;
1500         for (; n > 0; n--) {
1501                 w |= rsn_keymgmt(frm);
1502                 frm += 4, len -= 4;
1503         }
1504         if (w & RSN_ASE_8021X_UNSPEC)
1505                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1506         else
1507                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1508
1509         /* optional RSN capabilities */
1510         if (len > 2)
1511                 rsn->rsn_caps = le16dec(frm);
1512         /* XXXPMKID */
1513
1514         return 0;
1515 }
1516
1517 /*
1518  * WPA/802.11i association request processing.
1519  */
1520 static int
1521 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1522         const struct ieee80211_frame *wh, const uint8_t *wpa,
1523         const uint8_t *rsn, uint16_t capinfo)
1524 {
1525         struct ieee80211vap *vap = ni->ni_vap;
1526         uint8_t reason;
1527         int badwparsn;
1528
1529         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1530         if (wpa == NULL && rsn == NULL) {
1531                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1532                         /*
1533                          * W-Fi Protected Setup (WPS) permits
1534                          * clients to associate and pass EAPOL frames
1535                          * to establish initial credentials.
1536                          */
1537                         ni->ni_flags |= IEEE80211_NODE_WPS;
1538                         return 1;
1539                 }
1540                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1541                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1542                         /*
1543                          * Transitional Security Network.  Permits clients
1544                          * to associate and use WEP while WPA is configured.
1545                          */
1546                         ni->ni_flags |= IEEE80211_NODE_TSN;
1547                         return 1;
1548                 }
1549                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1550                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1551                 vap->iv_stats.is_rx_assoc_badwpaie++;
1552                 reason = IEEE80211_REASON_IE_INVALID;
1553                 goto bad;
1554         }
1555         /* assert right association security credentials */
1556         badwparsn = 0;                  /* NB: to silence compiler */
1557         switch (vap->iv_flags & IEEE80211_F_WPA) {
1558         case IEEE80211_F_WPA1:
1559                 badwparsn = (wpa == NULL);
1560                 break;
1561         case IEEE80211_F_WPA2:
1562                 badwparsn = (rsn == NULL);
1563                 break;
1564         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1565                 badwparsn = (wpa == NULL && rsn == NULL);
1566                 break;
1567         }
1568         if (badwparsn) {
1569                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1570                     wh, NULL,
1571                     "%s", "missing WPA/RSN IE in association request");
1572                 vap->iv_stats.is_rx_assoc_badwpaie++;
1573                 reason = IEEE80211_REASON_IE_INVALID;
1574                 goto bad;
1575         }
1576         /*
1577          * Parse WPA/RSN information element.
1578          */
1579         if (wpa != NULL)
1580                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1581         else
1582                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1583         if (reason != 0) {
1584                 /* XXX wpa->rsn fallback? */
1585                 /* XXX distinguish WPA/RSN? */
1586                 vap->iv_stats.is_rx_assoc_badwpaie++;
1587                 goto bad;
1588         }
1589         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1590             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1591             wpa != NULL ? "WPA" : "RSN",
1592             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1593             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1594             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1595
1596         return 1;
1597 bad:
1598         ieee80211_node_deauth(ni, reason);
1599         return 0;
1600 }
1601
1602 /* XXX find a better place for definition */
1603 struct l2_update_frame {
1604         struct ether_header eh;
1605         uint8_t dsap;
1606         uint8_t ssap;
1607         uint8_t control;
1608         uint8_t xid[3];
1609 }  __packed;
1610
1611 /*
1612  * Deliver a TGf L2UF frame on behalf of a station.
1613  * This primes any bridge when the station is roaming
1614  * between ap's on the same wired network.
1615  */
1616 static void
1617 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1618 {
1619         struct ieee80211vap *vap = ni->ni_vap;
1620         struct ifnet *ifp = vap->iv_ifp;
1621         struct mbuf *m;
1622         struct l2_update_frame *l2uf;
1623         struct ether_header *eh;
1624
1625         m = m_gethdr(M_NOWAIT, MT_DATA);
1626         if (m == NULL) {
1627                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1628                     "%s", "no mbuf for l2uf frame");
1629                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1630                 return;
1631         }
1632         l2uf = mtod(m, struct l2_update_frame *);
1633         eh = &l2uf->eh;
1634         /* dst: Broadcast address */
1635         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1636         /* src: associated STA */
1637         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1638         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1639
1640         l2uf->dsap = 0;
1641         l2uf->ssap = 0;
1642         l2uf->control = 0xf5;
1643         l2uf->xid[0] = 0x81;
1644         l2uf->xid[1] = 0x80;
1645         l2uf->xid[2] = 0x00;
1646
1647         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1648         hostap_deliver_data(vap, ni, m);
1649 }
1650
1651 static void
1652 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1653         int reassoc, int resp, const char *tag, int rate)
1654 {
1655         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1656             "deny %s request, %s rate set mismatch, rate/MCS %d",
1657             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1658         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1659         ieee80211_node_leave(ni);
1660 }
1661
1662 static void
1663 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1664         int reassoc, int resp, const char *tag, int capinfo)
1665 {
1666         struct ieee80211vap *vap = ni->ni_vap;
1667
1668         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1669             "deny %s request, %s mismatch 0x%x",
1670             reassoc ? "reassoc" : "assoc", tag, capinfo);
1671         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1672         ieee80211_node_leave(ni);
1673         vap->iv_stats.is_rx_assoc_capmismatch++;
1674 }
1675
1676 static void
1677 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1678         int reassoc, int resp)
1679 {
1680         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1681             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1682         /* XXX no better code */
1683         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1684         ieee80211_node_leave(ni);
1685 }
1686
1687 static void
1688 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1689         int algo, int seq, int status)
1690 {
1691         struct ieee80211vap *vap = ni->ni_vap;
1692
1693         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1694             wh, NULL, "unsupported alg %d", algo);
1695         vap->iv_stats.is_rx_auth_unsupported++;
1696         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1697             seq | (status << 16));
1698 }
1699
1700 static __inline int
1701 ishtmixed(const uint8_t *ie)
1702 {
1703         const struct ieee80211_ie_htinfo *ht =
1704             (const struct ieee80211_ie_htinfo *) ie;
1705         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1706             IEEE80211_HTINFO_OPMODE_MIXED;
1707 }
1708
1709 static int
1710 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1711 {
1712         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1713         int i;
1714
1715         /* NB: the 11b clients we care about will not have xrates */
1716         if (xrates != NULL || rates == NULL)
1717                 return 0;
1718         for (i = 0; i < rates[1]; i++) {
1719                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1720                 if (r > 2*11 || ((1<<r) & brates) == 0)
1721                         return 0;
1722         }
1723         return 1;
1724 }
1725
1726 static void
1727 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1728         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1729 {
1730         struct ieee80211vap *vap = ni->ni_vap;
1731         struct ieee80211com *ic = ni->ni_ic;
1732         struct ieee80211_frame *wh;
1733         uint8_t *frm, *efrm, *sfrm;
1734         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1735         int reassoc, resp;
1736         uint8_t rate;
1737
1738         wh = mtod(m0, struct ieee80211_frame *);
1739         frm = (uint8_t *)&wh[1];
1740         efrm = mtod(m0, uint8_t *) + m0->m_len;
1741         switch (subtype) {
1742         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1743                 /*
1744                  * We process beacon/probe response frames when scanning;
1745                  * otherwise we check beacon frames for overlapping non-ERP
1746                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1747                  */
1748                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1749                         vap->iv_stats.is_rx_mgtdiscard++;
1750                         return;
1751                 }
1752                 /* FALLTHROUGH */
1753         case IEEE80211_FC0_SUBTYPE_BEACON: {
1754                 struct ieee80211_scanparams scan;
1755
1756                 /* NB: accept off-channel frames */
1757                 /* XXX TODO: use rxstatus to determine off-channel details */
1758                 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1759                         return;
1760                 /*
1761                  * Count frame now that we know it's to be processed.
1762                  */
1763                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1764                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1765                         IEEE80211_NODE_STAT(ni, rx_beacons);
1766                 } else
1767                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1768                 /*
1769                  * If scanning, just pass information to the scan module.
1770                  */
1771                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1772                         if (scan.status == 0 &&         /* NB: on channel */
1773                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1774                                 /*
1775                                  * Actively scanning a channel marked passive;
1776                                  * send a probe request now that we know there
1777                                  * is 802.11 traffic present.
1778                                  *
1779                                  * XXX check if the beacon we recv'd gives
1780                                  * us what we need and suppress the probe req
1781                                  */
1782                                 ieee80211_probe_curchan(vap, 1);
1783                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1784                         }
1785                         ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1786                             subtype, rssi, nf);
1787                         return;
1788                 }
1789                 /*
1790                  * Check beacon for overlapping bss w/ non ERP stations.
1791                  * If we detect one and protection is configured but not
1792                  * enabled, enable it and start a timer that'll bring us
1793                  * out if we stop seeing the bss.
1794                  */
1795                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1796                     scan.status == 0 &&                 /* NB: on-channel */
1797                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1798                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1799                         ic->ic_lastnonerp = ticks;
1800                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1801                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1802                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1803                                 IEEE80211_NOTE_FRAME(vap,
1804                                     IEEE80211_MSG_ASSOC, wh,
1805                                     "non-ERP present on channel %d "
1806                                     "(saw erp 0x%x from channel %d), "
1807                                     "enable use of protection",
1808                                     ic->ic_curchan->ic_ieee,
1809                                     scan.erp, scan.chan);
1810                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1811                                 ieee80211_notify_erp(ic);
1812                         }
1813                 }
1814                 /*
1815                  * Check beacon for non-HT station on HT channel
1816                  * and update HT BSS occupancy as appropriate.
1817                  */
1818                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1819                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1820                                 /*
1821                                  * Off control channel; only check frames
1822                                  * that come in the extension channel when
1823                                  * operating w/ HT40.
1824                                  */
1825                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1826                                         break;
1827                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1828                                         break;
1829                         }
1830                         if (scan.htinfo == NULL) {
1831                                 ieee80211_htprot_update(ic,
1832                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1833                                     IEEE80211_HTINFO_NONHT_PRESENT);
1834                         } else if (ishtmixed(scan.htinfo)) {
1835                                 /* XXX? take NONHT_PRESENT from beacon? */
1836                                 ieee80211_htprot_update(ic,
1837                                     IEEE80211_HTINFO_OPMODE_MIXED |
1838                                     IEEE80211_HTINFO_NONHT_PRESENT);
1839                         }
1840                 }
1841                 break;
1842         }
1843
1844         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1845                 if (vap->iv_state != IEEE80211_S_RUN) {
1846                         vap->iv_stats.is_rx_mgtdiscard++;
1847                         return;
1848                 }
1849                 /*
1850                  * Consult the ACL policy module if setup.
1851                  */
1852                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1853                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1854                             wh, NULL, "%s", "disallowed by ACL");
1855                         vap->iv_stats.is_rx_acl++;
1856                         return;
1857                 }
1858                 /*
1859                  * prreq frame format
1860                  *      [tlv] ssid
1861                  *      [tlv] supported rates
1862                  *      [tlv] extended supported rates
1863                  */
1864                 ssid = rates = xrates = NULL;
1865                 while (efrm - frm > 1) {
1866                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1867                         switch (*frm) {
1868                         case IEEE80211_ELEMID_SSID:
1869                                 ssid = frm;
1870                                 break;
1871                         case IEEE80211_ELEMID_RATES:
1872                                 rates = frm;
1873                                 break;
1874                         case IEEE80211_ELEMID_XRATES:
1875                                 xrates = frm;
1876                                 break;
1877                         }
1878                         frm += frm[1] + 2;
1879                 }
1880                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1881                 if (xrates != NULL)
1882                         IEEE80211_VERIFY_ELEMENT(xrates,
1883                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1884                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1885                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1886                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1887                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1888                             wh, NULL,
1889                             "%s", "no ssid with ssid suppression enabled");
1890                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1891                         return;
1892                 }
1893
1894                 /* XXX find a better class or define it's own */
1895                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1896                     "%s", "recv probe req");
1897                 /*
1898                  * Some legacy 11b clients cannot hack a complete
1899                  * probe response frame.  When the request includes
1900                  * only a bare-bones rate set, communicate this to
1901                  * the transmit side.
1902                  */
1903                 ieee80211_send_proberesp(vap, wh->i_addr2,
1904                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1905                 break;
1906
1907         case IEEE80211_FC0_SUBTYPE_AUTH: {
1908                 uint16_t algo, seq, status;
1909
1910                 if (vap->iv_state != IEEE80211_S_RUN) {
1911                         vap->iv_stats.is_rx_mgtdiscard++;
1912                         return;
1913                 }
1914                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1915                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1916                             wh, NULL, "%s", "wrong bssid");
1917                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1918                         return;
1919                 }
1920                 /*
1921                  * auth frame format
1922                  *      [2] algorithm
1923                  *      [2] sequence
1924                  *      [2] status
1925                  *      [tlv*] challenge
1926                  */
1927                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1928                 algo   = le16toh(*(uint16_t *)frm);
1929                 seq    = le16toh(*(uint16_t *)(frm + 2));
1930                 status = le16toh(*(uint16_t *)(frm + 4));
1931                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1932                     "recv auth frame with algorithm %d seq %d", algo, seq);
1933                 /*
1934                  * Consult the ACL policy module if setup.
1935                  */
1936                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1937                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1938                             wh, NULL, "%s", "disallowed by ACL");
1939                         vap->iv_stats.is_rx_acl++;
1940                         ieee80211_send_error(ni, wh->i_addr2,
1941                             IEEE80211_FC0_SUBTYPE_AUTH,
1942                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1943                         return;
1944                 }
1945                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1946                         IEEE80211_DISCARD(vap,
1947                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1948                             wh, NULL, "%s", "TKIP countermeasures enabled");
1949                         vap->iv_stats.is_rx_auth_countermeasures++;
1950                         ieee80211_send_error(ni, wh->i_addr2,
1951                                 IEEE80211_FC0_SUBTYPE_AUTH,
1952                                 IEEE80211_REASON_MIC_FAILURE);
1953                         return;
1954                 }
1955                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1956                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1957                             seq, status);
1958                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1959                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1960                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1961                         authalgreject(ni, wh, algo,
1962                             seq+1, IEEE80211_STATUS_ALG);
1963                         return;
1964                 } else {
1965                         /*
1966                          * We assume that an unknown algorithm is the result
1967                          * of a decryption failure on a shared key auth frame;
1968                          * return a status code appropriate for that instead
1969                          * of IEEE80211_STATUS_ALG.
1970                          *
1971                          * NB: a seq# of 4 is intentional; the decrypted
1972                          *     frame likely has a bogus seq value.
1973                          */
1974                         authalgreject(ni, wh, algo,
1975                             4, IEEE80211_STATUS_CHALLENGE);
1976                         return;
1977                 }
1978                 break;
1979         }
1980
1981         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1982         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1983                 uint16_t capinfo, lintval;
1984                 struct ieee80211_rsnparms rsnparms;
1985
1986                 if (vap->iv_state != IEEE80211_S_RUN) {
1987                         vap->iv_stats.is_rx_mgtdiscard++;
1988                         return;
1989                 }
1990                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1991                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1992                             wh, NULL, "%s", "wrong bssid");
1993                         vap->iv_stats.is_rx_assoc_bss++;
1994                         return;
1995                 }
1996                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1997                         reassoc = 1;
1998                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
1999                 } else {
2000                         reassoc = 0;
2001                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2002                 }
2003                 if (ni == vap->iv_bss) {
2004                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2005                             "deny %s request, sta not authenticated",
2006                             reassoc ? "reassoc" : "assoc");
2007                         ieee80211_send_error(ni, wh->i_addr2,
2008                             IEEE80211_FC0_SUBTYPE_DEAUTH,
2009                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
2010                         vap->iv_stats.is_rx_assoc_notauth++;
2011                         return;
2012                 }
2013
2014                 /*
2015                  * asreq frame format
2016                  *      [2] capability information
2017                  *      [2] listen interval
2018                  *      [6*] current AP address (reassoc only)
2019                  *      [tlv] ssid
2020                  *      [tlv] supported rates
2021                  *      [tlv] extended supported rates
2022                  *      [tlv] WPA or RSN
2023                  *      [tlv] HT capabilities
2024                  *      [tlv] Atheros capabilities
2025                  */
2026                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2027                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
2028                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
2029                 if (reassoc)
2030                         frm += 6;       /* ignore current AP info */
2031                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2032                 sfrm = frm;
2033                 while (efrm - frm > 1) {
2034                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2035                         switch (*frm) {
2036                         case IEEE80211_ELEMID_SSID:
2037                                 ssid = frm;
2038                                 break;
2039                         case IEEE80211_ELEMID_RATES:
2040                                 rates = frm;
2041                                 break;
2042                         case IEEE80211_ELEMID_XRATES:
2043                                 xrates = frm;
2044                                 break;
2045                         case IEEE80211_ELEMID_RSN:
2046                                 rsn = frm;
2047                                 break;
2048                         case IEEE80211_ELEMID_HTCAP:
2049                                 htcap = frm;
2050                                 break;
2051                         case IEEE80211_ELEMID_VENDOR:
2052                                 if (iswpaoui(frm))
2053                                         wpa = frm;
2054                                 else if (iswmeinfo(frm))
2055                                         wme = frm;
2056 #ifdef IEEE80211_SUPPORT_SUPERG
2057                                 else if (isatherosoui(frm))
2058                                         ath = frm;
2059 #endif
2060                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2061                                         if (ishtcapoui(frm) && htcap == NULL)
2062                                                 htcap = frm;
2063                                 }
2064                                 break;
2065                         }
2066                         frm += frm[1] + 2;
2067                 }
2068                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2069                 if (xrates != NULL)
2070                         IEEE80211_VERIFY_ELEMENT(xrates,
2071                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2072                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2073                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2074                 if (htcap != NULL) {
2075                         IEEE80211_VERIFY_LENGTH(htcap[1],
2076                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2077                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2078                                  sizeof(struct ieee80211_ie_htcap)-2,
2079                              return);           /* XXX just NULL out? */
2080                 }
2081
2082                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2083                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2084                         return;
2085                 /* discard challenge after association */
2086                 if (ni->ni_challenge != NULL) {
2087                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2088                         ni->ni_challenge = NULL;
2089                 }
2090                 /* NB: 802.11 spec says to ignore station's privacy bit */
2091                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2092                         capinfomismatch(ni, wh, reassoc, resp,
2093                             "capability", capinfo);
2094                         return;
2095                 }
2096                 /*
2097                  * Disallow re-associate w/ invalid slot time setting.
2098                  */
2099                 if (ni->ni_associd != 0 &&
2100                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2101                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2102                         capinfomismatch(ni, wh, reassoc, resp,
2103                             "slot time", capinfo);
2104                         return;
2105                 }
2106                 rate = ieee80211_setup_rates(ni, rates, xrates,
2107                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2108                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2109                 if (rate & IEEE80211_RATE_BASIC) {
2110                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2111                         vap->iv_stats.is_rx_assoc_norate++;
2112                         return;
2113                 }
2114                 /*
2115                  * If constrained to 11g-only stations reject an
2116                  * 11b-only station.  We cheat a bit here by looking
2117                  * at the max negotiated xmit rate and assuming anyone
2118                  * with a best rate <24Mb/s is an 11b station.
2119                  */
2120                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2121                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2122                         vap->iv_stats.is_rx_assoc_norate++;
2123                         return;
2124                 }
2125                 /*
2126                  * Do HT rate set handling and setup HT node state.
2127                  */
2128                 ni->ni_chan = vap->iv_bss->ni_chan;
2129                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2130                         rate = ieee80211_setup_htrates(ni, htcap,
2131                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2132                                 IEEE80211_F_DOBRS);
2133                         if (rate & IEEE80211_RATE_BASIC) {
2134                                 ratesetmismatch(ni, wh, reassoc, resp,
2135                                     "HT", rate);
2136                                 vap->iv_stats.is_ht_assoc_norate++;
2137                                 return;
2138                         }
2139                         ieee80211_ht_node_init(ni);
2140                         ieee80211_ht_updatehtcap(ni, htcap);
2141                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2142                         ieee80211_ht_node_cleanup(ni);
2143 #ifdef IEEE80211_SUPPORT_SUPERG
2144                 /* Always do ff node cleanup; for A-MSDU */
2145                 ieee80211_ff_node_cleanup(ni);
2146 #endif
2147                 /*
2148                  * Allow AMPDU operation only with unencrypted traffic
2149                  * or AES-CCM; the 11n spec only specifies these ciphers
2150                  * so permitting any others is undefined and can lead
2151                  * to interoperability problems.
2152                  */
2153                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2154                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2155                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2156                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2157                         IEEE80211_NOTE(vap,
2158                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2159                             "disallow HT use because WEP or TKIP requested, "
2160                             "capinfo 0x%x ucastcipher %d", capinfo,
2161                             rsnparms.rsn_ucastcipher);
2162                         ieee80211_ht_node_cleanup(ni);
2163 #ifdef IEEE80211_SUPPORT_SUPERG
2164                         /* Always do ff node cleanup; for A-MSDU */
2165                         ieee80211_ff_node_cleanup(ni);
2166 #endif
2167                         vap->iv_stats.is_ht_assoc_downgrade++;
2168                 }
2169                 /*
2170                  * If constrained to 11n-only stations reject legacy stations.
2171                  */
2172                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2173                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2174                         htcapmismatch(ni, wh, reassoc, resp);
2175                         vap->iv_stats.is_ht_assoc_nohtcap++;
2176                         return;
2177                 }
2178                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2179                 ni->ni_noise = nf;
2180                 ni->ni_intval = lintval;
2181                 ni->ni_capinfo = capinfo;
2182                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2183                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2184                 /*
2185                  * Store the IEs.
2186                  * XXX maybe better to just expand
2187                  */
2188                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2189 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2190                         if (wpa != NULL)
2191                                 setie(wpa_ie, wpa - sfrm);
2192                         if (rsn != NULL)
2193                                 setie(rsn_ie, rsn - sfrm);
2194                         if (htcap != NULL)
2195                                 setie(htcap_ie, htcap - sfrm);
2196                         if (wme != NULL) {
2197                                 setie(wme_ie, wme - sfrm);
2198                                 /*
2199                                  * Mark node as capable of QoS.
2200                                  */
2201                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2202                         } else
2203                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2204 #ifdef IEEE80211_SUPPORT_SUPERG
2205                         if (ath != NULL) {
2206                                 setie(ath_ie, ath - sfrm);
2207                                 /*
2208                                  * Parse ATH station parameters.
2209                                  */
2210                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2211                         } else
2212 #endif
2213                                 ni->ni_ath_flags = 0;
2214 #undef setie
2215                 } else {
2216                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2217                         ni->ni_ath_flags = 0;
2218                 }
2219                 ieee80211_node_join(ni, resp);
2220                 ieee80211_deliver_l2uf(ni);
2221                 break;
2222         }
2223
2224         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2225         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2226                 uint16_t reason;
2227
2228                 if (vap->iv_state != IEEE80211_S_RUN ||
2229                     /* NB: can happen when in promiscuous mode */
2230                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2231                         vap->iv_stats.is_rx_mgtdiscard++;
2232                         break;
2233                 }
2234                 /*
2235                  * deauth/disassoc frame format
2236                  *      [2] reason
2237                  */
2238                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2239                 reason = le16toh(*(uint16_t *)frm);
2240                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2241                         vap->iv_stats.is_rx_deauth++;
2242                         IEEE80211_NODE_STAT(ni, rx_deauth);
2243                 } else {
2244                         vap->iv_stats.is_rx_disassoc++;
2245                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2246                 }
2247                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2248                     "recv %s (reason: %d (%s))",
2249                     ieee80211_mgt_subtype_name(subtype),
2250                     reason, ieee80211_reason_to_string(reason));
2251                 if (ni != vap->iv_bss)
2252                         ieee80211_node_leave(ni);
2253                 break;
2254         }
2255
2256         case IEEE80211_FC0_SUBTYPE_ACTION:
2257         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2258                 if (ni == vap->iv_bss) {
2259                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2260                             wh, NULL, "%s", "unknown node");
2261                         vap->iv_stats.is_rx_mgtdiscard++;
2262                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2263                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2264                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2265                             wh, NULL, "%s", "not for us");
2266                         vap->iv_stats.is_rx_mgtdiscard++;
2267                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2268                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2269                             wh, NULL, "wrong state %s",
2270                             ieee80211_state_name[vap->iv_state]);
2271                         vap->iv_stats.is_rx_mgtdiscard++;
2272                 } else {
2273                         if (ieee80211_parse_action(ni, m0) == 0)
2274                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2275                 }
2276                 break;
2277
2278         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2279         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2280         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2281         case IEEE80211_FC0_SUBTYPE_ATIM:
2282                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2283                     wh, NULL, "%s", "not handled");
2284                 vap->iv_stats.is_rx_mgtdiscard++;
2285                 break;
2286
2287         default:
2288                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2289                     wh, "mgt", "subtype 0x%x not handled", subtype);
2290                 vap->iv_stats.is_rx_badsubtype++;
2291                 break;
2292         }
2293 }
2294
2295 static void
2296 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2297 {
2298         switch (subtype) {
2299         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2300                 ni->ni_vap->iv_recv_pspoll(ni, m);
2301                 break;
2302         case IEEE80211_FC0_SUBTYPE_BAR:
2303                 ieee80211_recv_bar(ni, m);
2304                 break;
2305         }
2306 }
2307
2308 /*
2309  * Process a received ps-poll frame.
2310  */
2311 void
2312 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2313 {
2314         struct ieee80211vap *vap = ni->ni_vap;
2315         struct ieee80211com *ic = vap->iv_ic;
2316         struct ieee80211_frame_min *wh;
2317         struct mbuf *m;
2318         uint16_t aid;
2319         int qlen;
2320
2321         wh = mtod(m0, struct ieee80211_frame_min *);
2322         if (ni->ni_associd == 0) {
2323                 IEEE80211_DISCARD(vap,
2324                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2325                     (struct ieee80211_frame *) wh, NULL,
2326                     "%s", "unassociated station");
2327                 vap->iv_stats.is_ps_unassoc++;
2328                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2329                         IEEE80211_REASON_NOT_ASSOCED);
2330                 return;
2331         }
2332
2333         aid = le16toh(*(uint16_t *)wh->i_dur);
2334         if (aid != ni->ni_associd) {
2335                 IEEE80211_DISCARD(vap,
2336                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2337                     (struct ieee80211_frame *) wh, NULL,
2338                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2339                     ni->ni_associd, aid);
2340                 vap->iv_stats.is_ps_badaid++;
2341                 /*
2342                  * NB: We used to deauth the station but it turns out
2343                  * the Blackberry Curve 8230 (and perhaps other devices)
2344                  * sometimes send the wrong AID when WME is negotiated.
2345                  * Being more lenient here seems ok as we already check
2346                  * the station is associated and we only return frames
2347                  * queued for the station (i.e. we don't use the AID).
2348                  */
2349                 return;
2350         }
2351
2352         /* Okay, take the first queued packet and put it out... */
2353         m = ieee80211_node_psq_dequeue(ni, &qlen);
2354         if (m == NULL) {
2355                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2356                     "%s", "recv ps-poll, but queue empty");
2357                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2358                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2359                 if (vap->iv_set_tim != NULL)
2360                         vap->iv_set_tim(ni, 0); /* just in case */
2361                 return;
2362         }
2363         /*
2364          * If there are more packets, set the more packets bit
2365          * in the packet dispatched to the station; otherwise
2366          * turn off the TIM bit.
2367          */
2368         if (qlen != 0) {
2369                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2370                     "recv ps-poll, send packet, %u still queued", qlen);
2371                 m->m_flags |= M_MORE_DATA;
2372         } else {
2373                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2374                     "%s", "recv ps-poll, send packet, queue empty");
2375                 if (vap->iv_set_tim != NULL)
2376                         vap->iv_set_tim(ni, 0);
2377         }
2378         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2379
2380         /*
2381          * Do the right thing; if it's an encap'ed frame then
2382          * call ieee80211_parent_xmitpkt() else
2383          * call ieee80211_vap_xmitpkt().
2384          */
2385         if (m->m_flags & M_ENCAP) {
2386                 (void) ieee80211_parent_xmitpkt(ic, m);
2387         } else {
2388                 (void) ieee80211_vap_xmitpkt(vap, m);
2389         }
2390 }