sys/net80211/ieee80211_hostap.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 #ifdef __FreeBSD__
  30 __FBSDID("$FreeBSD$");
  31 #endif
  32
  33 /*
  34  * IEEE 802.11 HOSTAP mode support.
  35  */
  36 #include "opt_inet.h"
  37 #include "opt_wlan.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/mbuf.h>
  42 #include <sys/malloc.h>
  43 #include <sys/kernel.h>
  44
  45 #include <sys/socket.h>
  46 #include <sys/sockio.h>
  47 #include <sys/endian.h>
  48 #include <sys/errno.h>
  49 #include <sys/proc.h>
  50 #include <sys/sysctl.h>
  51
  52 #include <net/if.h>
  53 #include <net/if_var.h>
  54 #include <net/if_media.h>
  55 #include <net/if_llc.h>
  56 #include <net/ethernet.h>
  57
  58 #include <net/bpf.h>
  59
  60 #include <net80211/ieee80211_var.h>
  61 #include <net80211/ieee80211_hostap.h>
  62 #include <net80211/ieee80211_input.h>
  63 #ifdef IEEE80211_SUPPORT_SUPERG
  64 #include <net80211/ieee80211_superg.h>
  65 #endif
  66 #include <net80211/ieee80211_wds.h>
  67 #include <net80211/ieee80211_vht.h>
  68
  69 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
  70
  71 static  void hostap_vattach(struct ieee80211vap *);
  72 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  73 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
  74             const struct ieee80211_rx_stats *,
  75             int rssi, int nf);
  76 static void hostap_deliver_data(struct ieee80211vap *,
  77             struct ieee80211_node *, struct mbuf *);
  78 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  79             int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf);
  80 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
  81
  82 void
  83 ieee80211_hostap_attach(struct ieee80211com *ic)
  84 {
  85         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
  86 }
  87
  88 void
  89 ieee80211_hostap_detach(struct ieee80211com *ic)
  90 {
  91 }
  92
  93 static void
  94 hostap_vdetach(struct ieee80211vap *vap)
  95 {
  96 }
  97
  98 static void
  99 hostap_vattach(struct ieee80211vap *vap)
 100 {
 101         vap->iv_newstate = hostap_newstate;
 102         vap->iv_input = hostap_input;
 103         vap->iv_recv_mgmt = hostap_recv_mgmt;
 104         vap->iv_recv_ctl = hostap_recv_ctl;
 105         vap->iv_opdetach = hostap_vdetach;
 106         vap->iv_deliver_data = hostap_deliver_data;
 107         vap->iv_recv_pspoll = ieee80211_recv_pspoll;
 108 }
 109
 110 static void
 111 sta_disassoc(void *arg, struct ieee80211_node *ni)
 112 {
 113
 114         if (ni->ni_associd != 0) {
 115                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
 116                         IEEE80211_REASON_ASSOC_LEAVE);
 117                 ieee80211_node_leave(ni);
 118         }
 119 }
 120
 121 static void
 122 sta_csa(void *arg, struct ieee80211_node *ni)
 123 {
 124         struct ieee80211vap *vap = ni->ni_vap;
 125
 126         if (ni->ni_associd != 0)
 127                 if (ni->ni_inact > vap->iv_inact_init) {
 128                         ni->ni_inact = vap->iv_inact_init;
 129                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
 130                             "%s: inact %u", __func__, ni->ni_inact);
 131                 }
 132 }
 133
 134 static void
 135 sta_drop(void *arg, struct ieee80211_node *ni)
 136 {
 137
 138         if (ni->ni_associd != 0)
 139                 ieee80211_node_leave(ni);
 140 }
 141
 142 /*
 143  * Does a channel change require associated stations to re-associate
 144  * so protocol state is correct.  This is used when doing CSA across
 145  * bands or similar (e.g. HT -> legacy).
 146  */
 147 static int
 148 isbandchange(struct ieee80211com *ic)
 149 {
 150         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
 151             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
 152              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
 153 }
 154
 155 /*
 156  * IEEE80211_M_HOSTAP vap state machine handler.
 157  */
 158 static int
 159 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 160 {
 161         struct ieee80211com *ic = vap->iv_ic;
 162         enum ieee80211_state ostate;
 163
 164         IEEE80211_LOCK_ASSERT(ic);
 165
 166         ostate = vap->iv_state;
 167         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 168             __func__, ieee80211_state_name[ostate],
 169             ieee80211_state_name[nstate], arg);
 170         vap->iv_state = nstate;                 /* state transition */
 171         if (ostate != IEEE80211_S_SCAN)
 172                 ieee80211_cancel_scan(vap);     /* background scan */
 173         switch (nstate) {
 174         case IEEE80211_S_INIT:
 175                 switch (ostate) {
 176                 case IEEE80211_S_SCAN:
 177                         ieee80211_cancel_scan(vap);
 178                         break;
 179                 case IEEE80211_S_CAC:
 180                         ieee80211_dfs_cac_stop(vap);
 181                         break;
 182                 case IEEE80211_S_RUN:
 183                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 184                             sta_disassoc, NULL);
 185                         break;
 186                 default:
 187                         break;
 188                 }
 189                 if (ostate != IEEE80211_S_INIT) {
 190                         /* NB: optimize INIT -> INIT case */
 191                         ieee80211_reset_bss(vap);
 192                 }
 193                 if (vap->iv_auth->ia_detach != NULL)
 194                         vap->iv_auth->ia_detach(vap);
 195                 break;
 196         case IEEE80211_S_SCAN:
 197                 switch (ostate) {
 198                 case IEEE80211_S_CSA:
 199                 case IEEE80211_S_RUN:
 200                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 201                             sta_disassoc, NULL);
 202                         /*
 203                          * Clear overlapping BSS state; the beacon frame
 204                          * will be reconstructed on transition to the RUN
 205                          * state and the timeout routines check if the flag
 206                          * is set before doing anything so this is sufficient.
 207                          */
 208                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
 209                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
 210                         /* fall thru... */
 211                 case IEEE80211_S_CAC:
 212                         /*
 213                          * NB: We may get here because of a manual channel
 214                          *     change in which case we need to stop CAC
 215                          * XXX no need to stop if ostate RUN but it's ok
 216                          */
 217                         ieee80211_dfs_cac_stop(vap);
 218                         /* fall thru... */
 219                 case IEEE80211_S_INIT:
 220                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
 221                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
 222                                 /*
 223                                  * Already have a channel; bypass the
 224                                  * scan and startup immediately.
 225                                  * ieee80211_create_ibss will call back to
 226                                  * move us to RUN state.
 227                                  */
 228                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
 229                                 break;
 230                         }
 231                         /*
 232                          * Initiate a scan.  We can come here as a result
 233                          * of an IEEE80211_IOC_SCAN_REQ too in which case
 234                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
 235                          * and the scan request parameters will be present
 236                          * in iv_scanreq.  Otherwise we do the default.
 237                          */
 238                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
 239                                 ieee80211_check_scan(vap,
 240                                     vap->iv_scanreq_flags,
 241                                     vap->iv_scanreq_duration,
 242                                     vap->iv_scanreq_mindwell,
 243                                     vap->iv_scanreq_maxdwell,
 244                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
 245                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
 246                         } else
 247                                 ieee80211_check_scan_current(vap);
 248                         break;
 249                 case IEEE80211_S_SCAN:
 250                         /*
 251                          * A state change requires a reset; scan.
 252                          */
 253                         ieee80211_check_scan_current(vap);
 254                         break;
 255                 default:
 256                         break;
 257                 }
 258                 break;
 259         case IEEE80211_S_CAC:
 260                 /*
 261                  * Start CAC on a DFS channel.  We come here when starting
 262                  * a bss on a DFS channel (see ieee80211_create_ibss).
 263                  */
 264                 ieee80211_dfs_cac_start(vap);
 265                 break;
 266         case IEEE80211_S_RUN:
 267                 if (vap->iv_flags & IEEE80211_F_WPA) {
 268                         /* XXX validate prerequisites */
 269                 }
 270                 switch (ostate) {
 271                 case IEEE80211_S_INIT:
 272                         /*
 273                          * Already have a channel; bypass the
 274                          * scan and startup immediately.
 275                          * Note that ieee80211_create_ibss will call
 276                          * back to do a RUN->RUN state change.
 277                          */
 278                         ieee80211_create_ibss(vap,
 279                             ieee80211_ht_adjust_channel(ic,
 280                                 ic->ic_curchan, vap->iv_flags_ht));
 281                         /* NB: iv_bss is changed on return */
 282                         break;
 283                 case IEEE80211_S_CAC:
 284                         /*
 285                          * NB: This is the normal state change when CAC
 286                          * expires and no radar was detected; no need to
 287                          * clear the CAC timer as it's already expired.
 288                          */
 289                         /* fall thru... */
 290                 case IEEE80211_S_CSA:
 291                         /*
 292                          * Shorten inactivity timer of associated stations
 293                          * to weed out sta's that don't follow a CSA.
 294                          */
 295                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 296                             sta_csa, NULL);
 297                         /*
 298                          * Update bss node channel to reflect where
 299                          * we landed after CSA.
 300                          */
 301                         ieee80211_node_set_chan(vap->iv_bss,
 302                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
 303                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
 304                         /* XXX bypass debug msgs */
 305                         break;
 306                 case IEEE80211_S_SCAN:
 307                 case IEEE80211_S_RUN:
 308 #ifdef IEEE80211_DEBUG
 309                         if (ieee80211_msg_debug(vap)) {
 310                                 struct ieee80211_node *ni = vap->iv_bss;
 311                                 ieee80211_note(vap,
 312                                     "synchronized with %s ssid ",
 313                                     ether_sprintf(ni->ni_bssid));
 314                                 ieee80211_print_essid(ni->ni_essid,
 315                                     ni->ni_esslen);
 316                                 /* XXX MCS/HT */
 317                                 printf(" channel %d start %uMb\n",
 318                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
 319                                     IEEE80211_RATE2MBS(ni->ni_txrate));
 320                         }
 321 #endif
 322                         break;
 323                 default:
 324                         break;
 325                 }
 326                 /*
 327                  * Start/stop the authenticator.  We delay until here
 328                  * to allow configuration to happen out of order.
 329                  */
 330                 if (vap->iv_auth->ia_attach != NULL) {
 331                         /* XXX check failure */
 332                         vap->iv_auth->ia_attach(vap);
 333                 } else if (vap->iv_auth->ia_detach != NULL) {
 334                         vap->iv_auth->ia_detach(vap);
 335                 }
 336                 ieee80211_node_authorize(vap->iv_bss);
 337                 break;
 338         case IEEE80211_S_CSA:
 339                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
 340                         /*
 341                          * On a ``band change'' silently drop associated
 342                          * stations as they must re-associate before they
 343                          * can pass traffic (as otherwise protocol state
 344                          * such as capabilities and the negotiated rate
 345                          * set may/will be wrong).
 346                          */
 347                         ieee80211_iterate_nodes_vap(&ic->ic_sta, vap,
 348                             sta_drop, NULL);
 349                 }
 350                 break;
 351         default:
 352                 break;
 353         }
 354         return 0;
 355 }
 356
 357 static void
 358 hostap_deliver_data(struct ieee80211vap *vap,
 359         struct ieee80211_node *ni, struct mbuf *m)
 360 {
 361         struct ether_header *eh = mtod(m, struct ether_header *);
 362         struct ifnet *ifp = vap->iv_ifp;
 363
 364         /* clear driver/net80211 flags before passing up */
 365         m->m_flags &= ~(M_MCAST | M_BCAST);
 366         m_clrprotoflags(m);
 367
 368         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
 369             ("gack, opmode %d", vap->iv_opmode));
 370         /*
 371          * Do accounting.
 372          */
 373         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 374         IEEE80211_NODE_STAT(ni, rx_data);
 375         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 376         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 377                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
 378                 IEEE80211_NODE_STAT(ni, rx_mcast);
 379         } else
 380                 IEEE80211_NODE_STAT(ni, rx_ucast);
 381
 382         /* perform as a bridge within the AP */
 383         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
 384                 struct mbuf *mcopy = NULL;
 385
 386                 if (m->m_flags & M_MCAST) {
 387                         mcopy = m_dup(m, M_NOWAIT);
 388                         if (mcopy == NULL)
 389                                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 390                         else
 391                                 mcopy->m_flags |= M_MCAST;
 392                 } else {
 393                         /*
 394                          * Check if the destination is associated with the
 395                          * same vap and authorized to receive traffic.
 396                          * Beware of traffic destined for the vap itself;
 397                          * sending it will not work; just let it be delivered
 398                          * normally.
 399                          */
 400                         struct ieee80211_node *sta = ieee80211_find_vap_node(
 401                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
 402                         if (sta != NULL) {
 403                                 if (ieee80211_node_is_authorized(sta)) {
 404                                         /*
 405                                          * Beware of sending to ourself; this
 406                                          * needs to happen via the normal
 407                                          * input path.
 408                                          */
 409                                         if (sta != vap->iv_bss) {
 410                                                 mcopy = m;
 411                                                 m = NULL;
 412                                         }
 413                                 } else {
 414                                         vap->iv_stats.is_rx_unauth++;
 415                                         IEEE80211_NODE_STAT(sta, rx_unauth);
 416                                 }
 417                                 ieee80211_free_node(sta);
 418                         }
 419                 }
 420                 if (mcopy != NULL)
 421                         (void) ieee80211_vap_xmitpkt(vap, mcopy);
 422         }
 423         if (m != NULL) {
 424                 /*
 425                  * Mark frame as coming from vap's interface.
 426                  */
 427                 m->m_pkthdr.rcvif = ifp;
 428                 if (m->m_flags & M_MCAST) {
 429                         /*
 430                          * Spam DWDS vap's w/ multicast traffic.
 431                          */
 432                         /* XXX only if dwds in use? */
 433                         ieee80211_dwds_mcast(vap, m);
 434                 }
 435                 if (ni->ni_vlan != 0) {
 436                         /* attach vlan tag */
 437                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
 438                         m->m_flags |= M_VLANTAG;
 439                 }
 440                 ifp->if_input(ifp, m);
 441         }
 442 }
 443
 444 /*
 445  * Decide if a received management frame should be
 446  * printed when debugging is enabled.  This filters some
 447  * of the less interesting frames that come frequently
 448  * (e.g. beacons).
 449  */
 450 static __inline int
 451 doprint(struct ieee80211vap *vap, int subtype)
 452 {
 453         switch (subtype) {
 454         case IEEE80211_FC0_SUBTYPE_BEACON:
 455                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
 456         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 457                 return 0;
 458         }
 459         return 1;
 460 }
 461
 462 /*
 463  * Process a received frame.  The node associated with the sender
 464  * should be supplied.  If nothing was found in the node table then
 465  * the caller is assumed to supply a reference to iv_bss instead.
 466  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 467  * during AP scanning to select a AP to associate with; it can have
 468  * any units so long as values have consistent units and higher values
 469  * mean ``better signal''.  The receive timestamp is currently not used
 470  * by the 802.11 layer.
 471  */
 472 static int
 473 hostap_input(struct ieee80211_node *ni, struct mbuf *m,
 474     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 475 {
 476         struct ieee80211vap *vap = ni->ni_vap;
 477         struct ieee80211com *ic = ni->ni_ic;
 478         struct ifnet *ifp = vap->iv_ifp;
 479         struct ieee80211_frame *wh;
 480         struct ieee80211_key *key;
 481         struct ether_header *eh;
 482         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 483         uint8_t dir, type, subtype, qos;
 484         uint8_t *bssid;
 485         int is_hw_decrypted = 0;
 486         int has_decrypted = 0;
 487
 488         /*
 489          * Some devices do hardware decryption all the way through
 490          * to pretending the frame wasn't encrypted in the first place.
 491          * So, tag it appropriately so it isn't discarded inappropriately.
 492          */
 493         if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
 494                 is_hw_decrypted = 1;
 495
 496         if (m->m_flags & M_AMPDU_MPDU) {
 497                 /*
 498                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 499                  * w/ M_AMPDU_MPDU marked have already passed through
 500                  * here but were received out of order and been held on
 501                  * the reorder queue.  When resubmitted they are marked
 502                  * with the M_AMPDU_MPDU flag and we can bypass most of
 503                  * the normal processing.
 504                  */
 505                 wh = mtod(m, struct ieee80211_frame *);
 506                 type = IEEE80211_FC0_TYPE_DATA;
 507                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 508                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 509                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 510                 goto resubmit_ampdu;
 511         }
 512
 513         KASSERT(ni != NULL, ("null node"));
 514         ni->ni_inact = ni->ni_inact_reload;
 515
 516         type = -1;                      /* undefined */
 517
 518         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 519                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 520                     ni->ni_macaddr, NULL,
 521                     "too short (1): len %u", m->m_pkthdr.len);
 522                 vap->iv_stats.is_rx_tooshort++;
 523                 goto out;
 524         }
 525         /*
 526          * Bit of a cheat here, we use a pointer for a 3-address
 527          * frame format but don't reference fields past outside
 528          * ieee80211_frame_min w/o first validating the data is
 529          * present.
 530          */
 531         wh = mtod(m, struct ieee80211_frame *);
 532
 533         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 534             IEEE80211_FC0_VERSION_0) {
 535                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 536                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 537                     wh->i_fc[0], wh->i_fc[1]);
 538                 vap->iv_stats.is_rx_badversion++;
 539                 goto err;
 540         }
 541
 542         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 543         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 544         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 545         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 546                 if (dir != IEEE80211_FC1_DIR_NODS)
 547                         bssid = wh->i_addr1;
 548                 else if (type == IEEE80211_FC0_TYPE_CTL)
 549                         bssid = wh->i_addr1;
 550                 else {
 551                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 552                                 IEEE80211_DISCARD_MAC(vap,
 553                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
 554                                     NULL, "too short (2): len %u",
 555                                     m->m_pkthdr.len);
 556                                 vap->iv_stats.is_rx_tooshort++;
 557                                 goto out;
 558                         }
 559                         bssid = wh->i_addr3;
 560                 }
 561                 /*
 562                  * Validate the bssid.
 563                  */
 564                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
 565                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
 566                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
 567                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
 568                         /* not interested in */
 569                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 570                             bssid, NULL, "%s", "not to bss");
 571                         vap->iv_stats.is_rx_wrongbss++;
 572                         goto out;
 573                 }
 574
 575                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 576                 ni->ni_noise = nf;
 577                 if (IEEE80211_HAS_SEQ(type, subtype)) {
 578                         uint8_t tid = ieee80211_gettid(wh);
 579                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
 580                             TID_TO_WME_AC(tid) >= WME_AC_VI)
 581                                 ic->ic_wme.wme_hipri_traffic++;
 582                         if (! ieee80211_check_rxseq(ni, wh, bssid, rxs))
 583                                 goto out;
 584                 }
 585         }
 586
 587         switch (type) {
 588         case IEEE80211_FC0_TYPE_DATA:
 589                 hdrspace = ieee80211_hdrspace(ic, wh);
 590                 if (m->m_len < hdrspace &&
 591                     (m = m_pullup(m, hdrspace)) == NULL) {
 592                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 593                             ni->ni_macaddr, NULL,
 594                             "data too short: expecting %u", hdrspace);
 595                         vap->iv_stats.is_rx_tooshort++;
 596                         goto out;               /* XXX */
 597                 }
 598                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
 599                      (dir == IEEE80211_FC1_DIR_DSTODS &&
 600                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
 601                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
 602                                 IEEE80211_DISCARD(vap,
 603                                     IEEE80211_MSG_INPUT, wh, "data",
 604                                     "incorrect dir 0x%x", dir);
 605                         } else {
 606                                 IEEE80211_DISCARD(vap,
 607                                     IEEE80211_MSG_INPUT |
 608                                     IEEE80211_MSG_WDS, wh,
 609                                     "4-address data",
 610                                     "%s", "DWDS not enabled");
 611                         }
 612                         vap->iv_stats.is_rx_wrongdir++;
 613                         goto out;
 614                 }
 615                 /* check if source STA is associated */
 616                 if (ni == vap->iv_bss) {
 617                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 618                             wh, "data", "%s", "unknown src");
 619                         ieee80211_send_error(ni, wh->i_addr2,
 620                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 621                             IEEE80211_REASON_NOT_AUTHED);
 622                         vap->iv_stats.is_rx_notassoc++;
 623                         goto err;
 624                 }
 625                 if (ni->ni_associd == 0) {
 626                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 627                             wh, "data", "%s", "unassoc src");
 628                         IEEE80211_SEND_MGMT(ni,
 629                             IEEE80211_FC0_SUBTYPE_DISASSOC,
 630                             IEEE80211_REASON_NOT_ASSOCED);
 631                         vap->iv_stats.is_rx_notassoc++;
 632                         goto err;
 633                 }
 634
 635                 /*
 636                  * Check for power save state change.
 637                  * XXX out-of-order A-MPDU frames?
 638                  */
 639                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
 640                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
 641                         vap->iv_node_ps(ni,
 642                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
 643                 /*
 644                  * For 4-address packets handle WDS discovery
 645                  * notifications.  Once a WDS link is setup frames
 646                  * are just delivered to the WDS vap (see below).
 647                  */
 648                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
 649                         if (!ieee80211_node_is_authorized(ni)) {
 650                                 IEEE80211_DISCARD(vap,
 651                                     IEEE80211_MSG_INPUT |
 652                                     IEEE80211_MSG_WDS, wh,
 653                                     "4-address data",
 654                                     "%s", "unauthorized port");
 655                                 vap->iv_stats.is_rx_unauth++;
 656                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 657                                 goto err;
 658                         }
 659                         ieee80211_dwds_discover(ni, m);
 660                         return type;
 661                 }
 662
 663                 /*
 664                  * Handle A-MPDU re-ordering.  If the frame is to be
 665                  * processed directly then ieee80211_ampdu_reorder
 666                  * will return 0; otherwise it has consumed the mbuf
 667                  * and we should do nothing more with it.
 668                  */
 669                 if ((m->m_flags & M_AMPDU) &&
 670                     ieee80211_ampdu_reorder(ni, m, rxs) != 0) {
 671                         m = NULL;
 672                         goto out;
 673                 }
 674         resubmit_ampdu:
 675
 676                 /*
 677                  * Handle privacy requirements.  Note that we
 678                  * must not be preempted from here until after
 679                  * we (potentially) call ieee80211_crypto_demic;
 680                  * otherwise we may violate assumptions in the
 681                  * crypto cipher modules used to do delayed update
 682                  * of replay sequence numbers.
 683                  */
 684                 if (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 685                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 686                                 /*
 687                                  * Discard encrypted frames when privacy is off.
 688                                  */
 689                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 690                                     wh, "WEP", "%s", "PRIVACY off");
 691                                 vap->iv_stats.is_rx_noprivacy++;
 692                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 693                                 goto out;
 694                         }
 695                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 696                                 /* NB: stats+msgs handled in crypto_decap */
 697                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 698                                 goto out;
 699                         }
 700                         wh = mtod(m, struct ieee80211_frame *);
 701                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 702                         has_decrypted = 1;
 703                 } else {
 704                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 705                         key = NULL;
 706                 }
 707
 708                 /*
 709                  * Save QoS bits for use below--before we strip the header.
 710                  */
 711                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 712                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 713                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 714                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 715                 } else
 716                         qos = 0;
 717
 718                 /*
 719                  * Next up, any fragmentation.
 720                  */
 721                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 722                         m = ieee80211_defrag(ni, m, hdrspace);
 723                         if (m == NULL) {
 724                                 /* Fragment dropped or frame not complete yet */
 725                                 goto out;
 726                         }
 727                 }
 728                 wh = NULL;              /* no longer valid, catch any uses */
 729
 730                 /*
 731                  * Next strip any MSDU crypto bits.
 732                  */
 733                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 734                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 735                             ni->ni_macaddr, "data", "%s", "demic error");
 736                         vap->iv_stats.is_rx_demicfail++;
 737                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 738                         goto out;
 739                 }
 740                 /* copy to listener after decrypt */
 741                 if (ieee80211_radiotap_active_vap(vap))
 742                         ieee80211_radiotap_rx(vap, m);
 743                 need_tap = 0;
 744                 /*
 745                  * Finally, strip the 802.11 header.
 746                  */
 747                 m = ieee80211_decap(vap, m, hdrspace);
 748                 if (m == NULL) {
 749                         /* XXX mask bit to check for both */
 750                         /* don't count Null data frames as errors */
 751                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 752                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 753                                 goto out;
 754                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 755                             ni->ni_macaddr, "data", "%s", "decap error");
 756                         vap->iv_stats.is_rx_decap++;
 757                         IEEE80211_NODE_STAT(ni, rx_decap);
 758                         goto err;
 759                 }
 760                 eh = mtod(m, struct ether_header *);
 761                 if (!ieee80211_node_is_authorized(ni)) {
 762                         /*
 763                          * Deny any non-PAE frames received prior to
 764                          * authorization.  For open/shared-key
 765                          * authentication the port is mark authorized
 766                          * after authentication completes.  For 802.1x
 767                          * the port is not marked authorized by the
 768                          * authenticator until the handshake has completed.
 769                          */
 770                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 771                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 772                                     eh->ether_shost, "data",
 773                                     "unauthorized port: ether type 0x%x len %u",
 774                                     eh->ether_type, m->m_pkthdr.len);
 775                                 vap->iv_stats.is_rx_unauth++;
 776                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 777                                 goto err;
 778                         }
 779                 } else {
 780                         /*
 781                          * When denying unencrypted frames, discard
 782                          * any non-PAE frames received without encryption.
 783                          */
 784                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 785                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 786                             (is_hw_decrypted == 0) &&
 787                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 788                                 /*
 789                                  * Drop unencrypted frames.
 790                                  */
 791                                 vap->iv_stats.is_rx_unencrypted++;
 792                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 793                                 goto out;
 794                         }
 795                 }
 796                 /* XXX require HT? */
 797                 if (qos & IEEE80211_QOS_AMSDU) {
 798                         m = ieee80211_decap_amsdu(ni, m);
 799                         if (m == NULL)
 800                                 return IEEE80211_FC0_TYPE_DATA;
 801                 } else {
 802 #ifdef IEEE80211_SUPPORT_SUPERG
 803                         m = ieee80211_decap_fastframe(vap, ni, m);
 804                         if (m == NULL)
 805                                 return IEEE80211_FC0_TYPE_DATA;
 806 #endif
 807                 }
 808                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 809                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 810                 else
 811                         hostap_deliver_data(vap, ni, m);
 812                 return IEEE80211_FC0_TYPE_DATA;
 813
 814         case IEEE80211_FC0_TYPE_MGT:
 815                 vap->iv_stats.is_rx_mgmt++;
 816                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 817                 if (dir != IEEE80211_FC1_DIR_NODS) {
 818                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 819                             wh, "mgt", "incorrect dir 0x%x", dir);
 820                         vap->iv_stats.is_rx_wrongdir++;
 821                         goto err;
 822                 }
 823                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 824                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 825                             ni->ni_macaddr, "mgt", "too short: len %u",
 826                             m->m_pkthdr.len);
 827                         vap->iv_stats.is_rx_tooshort++;
 828                         goto out;
 829                 }
 830                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 831                         /* ensure return frames are unicast */
 832                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 833                             wh, NULL, "source is multicast: %s",
 834                             ether_sprintf(wh->i_addr2));
 835                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 836                         goto out;
 837                 }
 838 #ifdef IEEE80211_DEBUG
 839                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 840                     ieee80211_msg_dumppkts(vap)) {
 841                         if_printf(ifp, "received %s from %s rssi %d\n",
 842                             ieee80211_mgt_subtype_name(subtype),
 843                             ether_sprintf(wh->i_addr2), rssi);
 844                 }
 845 #endif
 846                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 847                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 848                                 /*
 849                                  * Only shared key auth frames with a challenge
 850                                  * should be encrypted, discard all others.
 851                                  */
 852                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 853                                     wh, NULL,
 854                                     "%s", "WEP set but not permitted");
 855                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 856                                 goto out;
 857                         }
 858                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 859                                 /*
 860                                  * Discard encrypted frames when privacy is off.
 861                                  */
 862                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 863                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 864                                 vap->iv_stats.is_rx_noprivacy++;
 865                                 goto out;
 866                         }
 867                         hdrspace = ieee80211_hdrspace(ic, wh);
 868                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 869                                 /* NB: stats+msgs handled in crypto_decap */
 870                                 goto out;
 871                         }
 872                         wh = mtod(m, struct ieee80211_frame *);
 873                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 874                         has_decrypted = 1;
 875                 }
 876                 /*
 877                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 878                  * Otherwise iv_recv_mgmt() might pass another packet to
 879                  * radiotap, resulting in out of order packet captures.
 880                  */
 881                 if (ieee80211_radiotap_active_vap(vap))
 882                         ieee80211_radiotap_rx(vap, m);
 883                 need_tap = 0;
 884                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 885                 goto out;
 886
 887         case IEEE80211_FC0_TYPE_CTL:
 888                 vap->iv_stats.is_rx_ctl++;
 889                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 890                 vap->iv_recv_ctl(ni, m, subtype);
 891                 goto out;
 892         default:
 893                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 894                     wh, "bad", "frame type 0x%x", type);
 895                 /* should not come here */
 896                 break;
 897         }
 898 err:
 899         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 900 out:
 901         if (m != NULL) {
 902                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 903                         ieee80211_radiotap_rx(vap, m);
 904                 m_freem(m);
 905         }
 906         return type;
 907 }
 908
 909 static void
 910 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 911     int rssi, int nf, uint16_t seq, uint16_t status)
 912 {
 913         struct ieee80211vap *vap = ni->ni_vap;
 914
 915         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 916
 917         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 918                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 919                     ni->ni_macaddr, "open auth",
 920                     "bad sta auth mode %u", ni->ni_authmode);
 921                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 922                 /*
 923                  * Clear any challenge text that may be there if
 924                  * a previous shared key auth failed and then an
 925                  * open auth is attempted.
 926                  */
 927                 if (ni->ni_challenge != NULL) {
 928                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
 929                         ni->ni_challenge = NULL;
 930                 }
 931                 /* XXX hack to workaround calling convention */
 932                 ieee80211_send_error(ni, wh->i_addr2,
 933                     IEEE80211_FC0_SUBTYPE_AUTH,
 934                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 935                 return;
 936         }
 937         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 938                 vap->iv_stats.is_rx_bad_auth++;
 939                 return;
 940         }
 941         /* always accept open authentication requests */
 942         if (ni == vap->iv_bss) {
 943                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 944                 if (ni == NULL)
 945                         return;
 946         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 947                 (void) ieee80211_ref_node(ni);
 948         /*
 949          * Mark the node as referenced to reflect that it's
 950          * reference count has been bumped to insure it remains
 951          * after the transaction completes.
 952          */
 953         ni->ni_flags |= IEEE80211_NODE_AREF;
 954         /*
 955          * Mark the node as requiring a valid association id
 956          * before outbound traffic is permitted.
 957          */
 958         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 959
 960         if (vap->iv_acl != NULL &&
 961             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 962                 /*
 963                  * When the ACL policy is set to RADIUS we defer the
 964                  * authorization to a user agent.  Dispatch an event,
 965                  * a subsequent MLME call will decide the fate of the
 966                  * station.  If the user agent is not present then the
 967                  * node will be reclaimed due to inactivity.
 968                  */
 969                 IEEE80211_NOTE_MAC(vap,
 970                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 971                     "%s", "station authentication defered (radius acl)");
 972                 ieee80211_notify_node_auth(ni);
 973         } else {
 974                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 975                 IEEE80211_NOTE_MAC(vap,
 976                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 977                     "%s", "station authenticated (open)");
 978                 /*
 979                  * When 802.1x is not in use mark the port
 980                  * authorized at this point so traffic can flow.
 981                  */
 982                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 983                         ieee80211_node_authorize(ni);
 984         }
 985 }
 986
 987 static void
 988 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 989     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 990     uint16_t seq, uint16_t status)
 991 {
 992         struct ieee80211vap *vap = ni->ni_vap;
 993         uint8_t *challenge;
 994         int allocbs, estatus;
 995
 996         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 997
 998         /*
 999          * NB: this can happen as we allow pre-shared key
1000          * authentication to be enabled w/o wep being turned
1001          * on so that configuration of these can be done
1002          * in any order.  It may be better to enforce the
1003          * ordering in which case this check would just be
1004          * for sanity/consistency.
1005          */
1006         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1007                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1008                     ni->ni_macaddr, "shared key auth",
1009                     "%s", " PRIVACY is disabled");
1010                 estatus = IEEE80211_STATUS_ALG;
1011                 goto bad;
1012         }
1013         /*
1014          * Pre-shared key authentication is evil; accept
1015          * it only if explicitly configured (it is supported
1016          * mainly for compatibility with clients like Mac OS X).
1017          */
1018         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1019             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1020                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1021                     ni->ni_macaddr, "shared key auth",
1022                     "bad sta auth mode %u", ni->ni_authmode);
1023                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1024                 estatus = IEEE80211_STATUS_ALG;
1025                 goto bad;
1026         }
1027
1028         challenge = NULL;
1029         if (frm + 1 < efrm) {
1030                 if ((frm[1] + 2) > (efrm - frm)) {
1031                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1032                             ni->ni_macaddr, "shared key auth",
1033                             "ie %d/%d too long",
1034                             frm[0], (frm[1] + 2) - (efrm - frm));
1035                         vap->iv_stats.is_rx_bad_auth++;
1036                         estatus = IEEE80211_STATUS_CHALLENGE;
1037                         goto bad;
1038                 }
1039                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1040                         challenge = frm;
1041                 frm += frm[1] + 2;
1042         }
1043         switch (seq) {
1044         case IEEE80211_AUTH_SHARED_CHALLENGE:
1045         case IEEE80211_AUTH_SHARED_RESPONSE:
1046                 if (challenge == NULL) {
1047                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1048                             ni->ni_macaddr, "shared key auth",
1049                             "%s", "no challenge");
1050                         vap->iv_stats.is_rx_bad_auth++;
1051                         estatus = IEEE80211_STATUS_CHALLENGE;
1052                         goto bad;
1053                 }
1054                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1055                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1056                             ni->ni_macaddr, "shared key auth",
1057                             "bad challenge len %d", challenge[1]);
1058                         vap->iv_stats.is_rx_bad_auth++;
1059                         estatus = IEEE80211_STATUS_CHALLENGE;
1060                         goto bad;
1061                 }
1062         default:
1063                 break;
1064         }
1065         switch (seq) {
1066         case IEEE80211_AUTH_SHARED_REQUEST:
1067                 if (ni == vap->iv_bss) {
1068                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1069                         if (ni == NULL) {
1070                                 /* NB: no way to return an error */
1071                                 return;
1072                         }
1073                         allocbs = 1;
1074                 } else {
1075                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1076                                 (void) ieee80211_ref_node(ni);
1077                         allocbs = 0;
1078                 }
1079                 /*
1080                  * Mark the node as referenced to reflect that it's
1081                  * reference count has been bumped to insure it remains
1082                  * after the transaction completes.
1083                  */
1084                 ni->ni_flags |= IEEE80211_NODE_AREF;
1085                 /*
1086                  * Mark the node as requiring a valid association id
1087                  * before outbound traffic is permitted.
1088                  */
1089                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1090                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1091                 ni->ni_noise = nf;
1092                 if (!ieee80211_alloc_challenge(ni)) {
1093                         /* NB: don't return error so they rexmit */
1094                         return;
1095                 }
1096                 get_random_bytes(ni->ni_challenge,
1097                         IEEE80211_CHALLENGE_LEN);
1098                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1099                     ni, "shared key %sauth request", allocbs ? "" : "re");
1100                 /*
1101                  * When the ACL policy is set to RADIUS we defer the
1102                  * authorization to a user agent.  Dispatch an event,
1103                  * a subsequent MLME call will decide the fate of the
1104                  * station.  If the user agent is not present then the
1105                  * node will be reclaimed due to inactivity.
1106                  */
1107                 if (vap->iv_acl != NULL &&
1108                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1109                         IEEE80211_NOTE_MAC(vap,
1110                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1111                             ni->ni_macaddr,
1112                             "%s", "station authentication defered (radius acl)");
1113                         ieee80211_notify_node_auth(ni);
1114                         return;
1115                 }
1116                 break;
1117         case IEEE80211_AUTH_SHARED_RESPONSE:
1118                 if (ni == vap->iv_bss) {
1119                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1120                             ni->ni_macaddr, "shared key response",
1121                             "%s", "unknown station");
1122                         /* NB: don't send a response */
1123                         return;
1124                 }
1125                 if (ni->ni_challenge == NULL) {
1126                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1127                             ni->ni_macaddr, "shared key response",
1128                             "%s", "no challenge recorded");
1129                         vap->iv_stats.is_rx_bad_auth++;
1130                         estatus = IEEE80211_STATUS_CHALLENGE;
1131                         goto bad;
1132                 }
1133                 if (memcmp(ni->ni_challenge, &challenge[2],
1134                            challenge[1]) != 0) {
1135                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1136                             ni->ni_macaddr, "shared key response",
1137                             "%s", "challenge mismatch");
1138                         vap->iv_stats.is_rx_auth_fail++;
1139                         estatus = IEEE80211_STATUS_CHALLENGE;
1140                         goto bad;
1141                 }
1142                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1143                     ni, "%s", "station authenticated (shared key)");
1144                 ieee80211_node_authorize(ni);
1145                 break;
1146         default:
1147                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1148                     ni->ni_macaddr, "shared key auth",
1149                     "bad seq %d", seq);
1150                 vap->iv_stats.is_rx_bad_auth++;
1151                 estatus = IEEE80211_STATUS_SEQUENCE;
1152                 goto bad;
1153         }
1154         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1155         return;
1156 bad:
1157         /*
1158          * Send an error response; but only when operating as an AP.
1159          */
1160         /* XXX hack to workaround calling convention */
1161         ieee80211_send_error(ni, wh->i_addr2,
1162             IEEE80211_FC0_SUBTYPE_AUTH,
1163             (seq + 1) | (estatus<<16));
1164 }
1165
1166 /*
1167  * Convert a WPA cipher selector OUI to an internal
1168  * cipher algorithm.  Where appropriate we also
1169  * record any key length.
1170  */
1171 static int
1172 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1173 {
1174 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1175         uint32_t w = le32dec(sel);
1176
1177         switch (w) {
1178         case WPA_SEL(WPA_CSE_NULL):
1179                 *cipher = IEEE80211_CIPHER_NONE;
1180                 break;
1181         case WPA_SEL(WPA_CSE_WEP40):
1182                 if (keylen)
1183                         *keylen = 40 / NBBY;
1184                 *cipher = IEEE80211_CIPHER_WEP;
1185                 break;
1186         case WPA_SEL(WPA_CSE_WEP104):
1187                 if (keylen)
1188                         *keylen = 104 / NBBY;
1189                 *cipher = IEEE80211_CIPHER_WEP;
1190                 break;
1191         case WPA_SEL(WPA_CSE_TKIP):
1192                 *cipher = IEEE80211_CIPHER_TKIP;
1193                 break;
1194         case WPA_SEL(WPA_CSE_CCMP):
1195                 *cipher = IEEE80211_CIPHER_AES_CCM;
1196                 break;
1197         default:
1198                 return (EINVAL);
1199         }
1200
1201         return (0);
1202 #undef WPA_SEL
1203 }
1204
1205 /*
1206  * Convert a WPA key management/authentication algorithm
1207  * to an internal code.
1208  */
1209 static int
1210 wpa_keymgmt(const uint8_t *sel)
1211 {
1212 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1213         uint32_t w = le32dec(sel);
1214
1215         switch (w) {
1216         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1217                 return WPA_ASE_8021X_UNSPEC;
1218         case WPA_SEL(WPA_ASE_8021X_PSK):
1219                 return WPA_ASE_8021X_PSK;
1220         case WPA_SEL(WPA_ASE_NONE):
1221                 return WPA_ASE_NONE;
1222         }
1223         return 0;               /* NB: so is discarded */
1224 #undef WPA_SEL
1225 }
1226
1227 /*
1228  * Parse a WPA information element to collect parameters.
1229  * Note that we do not validate security parameters; that
1230  * is handled by the authenticator; the parsing done here
1231  * is just for internal use in making operational decisions.
1232  */
1233 static int
1234 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1235         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1236 {
1237         uint8_t len = frm[1];
1238         uint32_t w;
1239         int error, n;
1240
1241         /*
1242          * Check the length once for fixed parts: OUI, type,
1243          * version, mcast cipher, and 2 selector counts.
1244          * Other, variable-length data, must be checked separately.
1245          */
1246         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1247                 IEEE80211_DISCARD_IE(vap,
1248                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1249                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1250                 return IEEE80211_REASON_IE_INVALID;
1251         }
1252         if (len < 14) {
1253                 IEEE80211_DISCARD_IE(vap,
1254                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1255                     wh, "WPA", "too short, len %u", len);
1256                 return IEEE80211_REASON_IE_INVALID;
1257         }
1258         frm += 6, len -= 4;             /* NB: len is payload only */
1259         /* NB: iswpaoui already validated the OUI and type */
1260         w = le16dec(frm);
1261         if (w != WPA_VERSION) {
1262                 IEEE80211_DISCARD_IE(vap,
1263                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1264                     wh, "WPA", "bad version %u", w);
1265                 return IEEE80211_REASON_IE_INVALID;
1266         }
1267         frm += 2, len -= 2;
1268
1269         memset(rsn, 0, sizeof(*rsn));
1270
1271         /* multicast/group cipher */
1272         error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1273         if (error != 0) {
1274                 IEEE80211_DISCARD_IE(vap,
1275                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1276                     wh, "WPA", "unknown mcast cipher suite %08X",
1277                     le32dec(frm));
1278                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1279         }
1280         frm += 4, len -= 4;
1281
1282         /* unicast ciphers */
1283         n = le16dec(frm);
1284         frm += 2, len -= 2;
1285         if (len < n*4+2) {
1286                 IEEE80211_DISCARD_IE(vap,
1287                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1288                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1289                     len, n);
1290                 return IEEE80211_REASON_IE_INVALID;
1291         }
1292         w = 0;
1293         for (; n > 0; n--) {
1294                 uint8_t cipher;
1295
1296                 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1297                 if (error == 0)
1298                         w |= 1 << cipher;
1299
1300                 frm += 4, len -= 4;
1301         }
1302         if (w == 0) {
1303                 IEEE80211_DISCARD_IE(vap,
1304                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1305                     wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1306                     w);
1307                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1308         }
1309         /* XXX other? */
1310         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1311                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1312         else
1313                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1314
1315         /* key management algorithms */
1316         n = le16dec(frm);
1317         frm += 2, len -= 2;
1318         if (len < n*4) {
1319                 IEEE80211_DISCARD_IE(vap,
1320                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1321                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1322                     len, n);
1323                 return IEEE80211_REASON_IE_INVALID;
1324         }
1325         w = 0;
1326         for (; n > 0; n--) {
1327                 w |= wpa_keymgmt(frm);
1328                 frm += 4, len -= 4;
1329         }
1330         if (w & WPA_ASE_8021X_UNSPEC)
1331                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1332         else
1333                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1334
1335         if (len > 2)            /* optional capabilities */
1336                 rsn->rsn_caps = le16dec(frm);
1337
1338         return 0;
1339 }
1340
1341 /*
1342  * Convert an RSN cipher selector OUI to an internal
1343  * cipher algorithm.  Where appropriate we also
1344  * record any key length.
1345  */
1346 static int
1347 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1348 {
1349 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1350         uint32_t w = le32dec(sel);
1351
1352         switch (w) {
1353         case RSN_SEL(RSN_CSE_NULL):
1354                 *cipher = IEEE80211_CIPHER_NONE;
1355                 break;
1356         case RSN_SEL(RSN_CSE_WEP40):
1357                 if (keylen)
1358                         *keylen = 40 / NBBY;
1359                 *cipher = IEEE80211_CIPHER_WEP;
1360                 break;
1361         case RSN_SEL(RSN_CSE_WEP104):
1362                 if (keylen)
1363                         *keylen = 104 / NBBY;
1364                 *cipher = IEEE80211_CIPHER_WEP;
1365                 break;
1366         case RSN_SEL(RSN_CSE_TKIP):
1367                 *cipher = IEEE80211_CIPHER_TKIP;
1368                 break;
1369         case RSN_SEL(RSN_CSE_CCMP):
1370                 *cipher = IEEE80211_CIPHER_AES_CCM;
1371                 break;
1372         case RSN_SEL(RSN_CSE_WRAP):
1373                 *cipher = IEEE80211_CIPHER_AES_OCB;
1374                 break;
1375         default:
1376                 return (EINVAL);
1377         }
1378
1379         return (0);
1380 #undef WPA_SEL
1381 }
1382
1383 /*
1384  * Convert an RSN key management/authentication algorithm
1385  * to an internal code.
1386  */
1387 static int
1388 rsn_keymgmt(const uint8_t *sel)
1389 {
1390 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1391         uint32_t w = le32dec(sel);
1392
1393         switch (w) {
1394         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1395                 return RSN_ASE_8021X_UNSPEC;
1396         case RSN_SEL(RSN_ASE_8021X_PSK):
1397                 return RSN_ASE_8021X_PSK;
1398         case RSN_SEL(RSN_ASE_NONE):
1399                 return RSN_ASE_NONE;
1400         }
1401         return 0;               /* NB: so is discarded */
1402 #undef RSN_SEL
1403 }
1404
1405 /*
1406  * Parse a WPA/RSN information element to collect parameters
1407  * and validate the parameters against what has been
1408  * configured for the system.
1409  */
1410 static int
1411 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1412         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1413 {
1414         uint8_t len = frm[1];
1415         uint32_t w;
1416         int error, n;
1417
1418         /*
1419          * Check the length once for fixed parts:
1420          * version, mcast cipher, and 2 selector counts.
1421          * Other, variable-length data, must be checked separately.
1422          */
1423         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1424                 IEEE80211_DISCARD_IE(vap,
1425                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1426                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1427                 return IEEE80211_REASON_IE_INVALID;
1428         }
1429         /* XXX may be shorter */
1430         if (len < 10) {
1431                 IEEE80211_DISCARD_IE(vap,
1432                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1433                     wh, "RSN", "too short, len %u", len);
1434                 return IEEE80211_REASON_IE_INVALID;
1435         }
1436         frm += 2;
1437         w = le16dec(frm);
1438         if (w != RSN_VERSION) {
1439                 IEEE80211_DISCARD_IE(vap,
1440                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1441                     wh, "RSN", "bad version %u", w);
1442                 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1443         }
1444         frm += 2, len -= 2;
1445
1446         memset(rsn, 0, sizeof(*rsn));
1447
1448         /* multicast/group cipher */
1449         error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1450         if (error != 0) {
1451                 IEEE80211_DISCARD_IE(vap,
1452                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1453                     wh, "RSN", "unknown mcast cipher suite %08X",
1454                     le32dec(frm));
1455                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1456         }
1457         if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1458                 IEEE80211_DISCARD_IE(vap,
1459                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1460                     wh, "RSN", "invalid mcast cipher suite %d",
1461                     rsn->rsn_mcastcipher);
1462                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1463         }
1464         frm += 4, len -= 4;
1465
1466         /* unicast ciphers */
1467         n = le16dec(frm);
1468         frm += 2, len -= 2;
1469         if (len < n*4+2) {
1470                 IEEE80211_DISCARD_IE(vap,
1471                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1472                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1473                     len, n);
1474                 return IEEE80211_REASON_IE_INVALID;
1475         }
1476         w = 0;
1477
1478         for (; n > 0; n--) {
1479                 uint8_t cipher;
1480
1481                 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1482                 if (error == 0)
1483                         w |= 1 << cipher;
1484
1485                 frm += 4, len -= 4;
1486         }
1487         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1488                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1489         else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1490                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1491         else if (w & (1 << IEEE80211_CIPHER_TKIP))
1492                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1493         else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1494             (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1495              rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1496                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1497         else {
1498                 IEEE80211_DISCARD_IE(vap,
1499                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1500                     wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1501                     w);
1502                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1503         }
1504
1505         /* key management algorithms */
1506         n = le16dec(frm);
1507         frm += 2, len -= 2;
1508         if (len < n*4) {
1509                 IEEE80211_DISCARD_IE(vap,
1510                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1511                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1512                     len, n);
1513                 return IEEE80211_REASON_IE_INVALID;
1514         }
1515         w = 0;
1516         for (; n > 0; n--) {
1517                 w |= rsn_keymgmt(frm);
1518                 frm += 4, len -= 4;
1519         }
1520         if (w & RSN_ASE_8021X_UNSPEC)
1521                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1522         else
1523                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1524
1525         /* optional RSN capabilities */
1526         if (len > 2)
1527                 rsn->rsn_caps = le16dec(frm);
1528         /* XXXPMKID */
1529
1530         return 0;
1531 }
1532
1533 /*
1534  * WPA/802.11i association request processing.
1535  */
1536 static int
1537 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1538         const struct ieee80211_frame *wh, const uint8_t *wpa,
1539         const uint8_t *rsn, uint16_t capinfo)
1540 {
1541         struct ieee80211vap *vap = ni->ni_vap;
1542         uint8_t reason;
1543         int badwparsn;
1544
1545         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1546         if (wpa == NULL && rsn == NULL) {
1547                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1548                         /*
1549                          * W-Fi Protected Setup (WPS) permits
1550                          * clients to associate and pass EAPOL frames
1551                          * to establish initial credentials.
1552                          */
1553                         ni->ni_flags |= IEEE80211_NODE_WPS;
1554                         return 1;
1555                 }
1556                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1557                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1558                         /*
1559                          * Transitional Security Network.  Permits clients
1560                          * to associate and use WEP while WPA is configured.
1561                          */
1562                         ni->ni_flags |= IEEE80211_NODE_TSN;
1563                         return 1;
1564                 }
1565                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1566                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1567                 vap->iv_stats.is_rx_assoc_badwpaie++;
1568                 reason = IEEE80211_REASON_IE_INVALID;
1569                 goto bad;
1570         }
1571         /* assert right association security credentials */
1572         badwparsn = 0;                  /* NB: to silence compiler */
1573         switch (vap->iv_flags & IEEE80211_F_WPA) {
1574         case IEEE80211_F_WPA1:
1575                 badwparsn = (wpa == NULL);
1576                 break;
1577         case IEEE80211_F_WPA2:
1578                 badwparsn = (rsn == NULL);
1579                 break;
1580         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1581                 badwparsn = (wpa == NULL && rsn == NULL);
1582                 break;
1583         }
1584         if (badwparsn) {
1585                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1586                     wh, NULL,
1587                     "%s", "missing WPA/RSN IE in association request");
1588                 vap->iv_stats.is_rx_assoc_badwpaie++;
1589                 reason = IEEE80211_REASON_IE_INVALID;
1590                 goto bad;
1591         }
1592         /*
1593          * Parse WPA/RSN information element.
1594          */
1595         if (wpa != NULL)
1596                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1597         else
1598                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1599         if (reason != 0) {
1600                 /* XXX wpa->rsn fallback? */
1601                 /* XXX distinguish WPA/RSN? */
1602                 vap->iv_stats.is_rx_assoc_badwpaie++;
1603                 goto bad;
1604         }
1605         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1606             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1607             wpa != NULL ? "WPA" : "RSN",
1608             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1609             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1610             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1611
1612         return 1;
1613 bad:
1614         ieee80211_node_deauth(ni, reason);
1615         return 0;
1616 }
1617
1618 /* XXX find a better place for definition */
1619 struct l2_update_frame {
1620         struct ether_header eh;
1621         uint8_t dsap;
1622         uint8_t ssap;
1623         uint8_t control;
1624         uint8_t xid[3];
1625 }  __packed;
1626
1627 /*
1628  * Deliver a TGf L2UF frame on behalf of a station.
1629  * This primes any bridge when the station is roaming
1630  * between ap's on the same wired network.
1631  */
1632 static void
1633 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1634 {
1635         struct ieee80211vap *vap = ni->ni_vap;
1636         struct ifnet *ifp = vap->iv_ifp;
1637         struct mbuf *m;
1638         struct l2_update_frame *l2uf;
1639         struct ether_header *eh;
1640
1641         m = m_gethdr(M_NOWAIT, MT_DATA);
1642         if (m == NULL) {
1643                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1644                     "%s", "no mbuf for l2uf frame");
1645                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1646                 return;
1647         }
1648         l2uf = mtod(m, struct l2_update_frame *);
1649         eh = &l2uf->eh;
1650         /* dst: Broadcast address */
1651         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1652         /* src: associated STA */
1653         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1654         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1655
1656         l2uf->dsap = 0;
1657         l2uf->ssap = 0;
1658         l2uf->control = 0xf5;
1659         l2uf->xid[0] = 0x81;
1660         l2uf->xid[1] = 0x80;
1661         l2uf->xid[2] = 0x00;
1662
1663         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1664         hostap_deliver_data(vap, ni, m);
1665 }
1666
1667 static void
1668 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1669         int reassoc, int resp, const char *tag, int rate)
1670 {
1671         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1672             "deny %s request, %s rate set mismatch, rate/MCS %d",
1673             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1674         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1675         ieee80211_node_leave(ni);
1676 }
1677
1678 static void
1679 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1680         int reassoc, int resp, const char *tag, int capinfo)
1681 {
1682         struct ieee80211vap *vap = ni->ni_vap;
1683
1684         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1685             "deny %s request, %s mismatch 0x%x",
1686             reassoc ? "reassoc" : "assoc", tag, capinfo);
1687         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1688         ieee80211_node_leave(ni);
1689         vap->iv_stats.is_rx_assoc_capmismatch++;
1690 }
1691
1692 static void
1693 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1694         int reassoc, int resp)
1695 {
1696         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1697             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1698         /* XXX no better code */
1699         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1700         ieee80211_node_leave(ni);
1701 }
1702
1703 static void
1704 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1705         int algo, int seq, int status)
1706 {
1707         struct ieee80211vap *vap = ni->ni_vap;
1708
1709         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1710             wh, NULL, "unsupported alg %d", algo);
1711         vap->iv_stats.is_rx_auth_unsupported++;
1712         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1713             seq | (status << 16));
1714 }
1715
1716 static __inline int
1717 ishtmixed(const uint8_t *ie)
1718 {
1719         const struct ieee80211_ie_htinfo *ht =
1720             (const struct ieee80211_ie_htinfo *) ie;
1721         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1722             IEEE80211_HTINFO_OPMODE_MIXED;
1723 }
1724
1725 static int
1726 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1727 {
1728         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1729         int i;
1730
1731         /* NB: the 11b clients we care about will not have xrates */
1732         if (xrates != NULL || rates == NULL)
1733                 return 0;
1734         for (i = 0; i < rates[1]; i++) {
1735                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1736                 if (r > 2*11 || ((1<<r) & brates) == 0)
1737                         return 0;
1738         }
1739         return 1;
1740 }
1741
1742 static void
1743 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1744         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1745 {
1746         struct ieee80211vap *vap = ni->ni_vap;
1747         struct ieee80211com *ic = ni->ni_ic;
1748         struct ieee80211_frame *wh;
1749         uint8_t *frm, *efrm, *sfrm;
1750         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1751         uint8_t *vhtcap, *vhtinfo;
1752         int reassoc, resp;
1753         uint8_t rate;
1754
1755         wh = mtod(m0, struct ieee80211_frame *);
1756         frm = (uint8_t *)&wh[1];
1757         efrm = mtod(m0, uint8_t *) + m0->m_len;
1758         switch (subtype) {
1759         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1760                 /*
1761                  * We process beacon/probe response frames when scanning;
1762                  * otherwise we check beacon frames for overlapping non-ERP
1763                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1764                  */
1765                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1766                         vap->iv_stats.is_rx_mgtdiscard++;
1767                         return;
1768                 }
1769                 /* FALLTHROUGH */
1770         case IEEE80211_FC0_SUBTYPE_BEACON: {
1771                 struct ieee80211_scanparams scan;
1772
1773                 /* NB: accept off-channel frames */
1774                 /* XXX TODO: use rxstatus to determine off-channel details */
1775                 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1776                         return;
1777                 /*
1778                  * Count frame now that we know it's to be processed.
1779                  */
1780                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1781                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1782                         IEEE80211_NODE_STAT(ni, rx_beacons);
1783                 } else
1784                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1785                 /*
1786                  * If scanning, just pass information to the scan module.
1787                  */
1788                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1789                         if (scan.status == 0 &&         /* NB: on channel */
1790                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1791                                 /*
1792                                  * Actively scanning a channel marked passive;
1793                                  * send a probe request now that we know there
1794                                  * is 802.11 traffic present.
1795                                  *
1796                                  * XXX check if the beacon we recv'd gives
1797                                  * us what we need and suppress the probe req
1798                                  */
1799                                 ieee80211_probe_curchan(vap, 1);
1800                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1801                         }
1802                         ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1803                             subtype, rssi, nf);
1804                         return;
1805                 }
1806                 /*
1807                  * Check beacon for overlapping bss w/ non ERP stations.
1808                  * If we detect one and protection is configured but not
1809                  * enabled, enable it and start a timer that'll bring us
1810                  * out if we stop seeing the bss.
1811                  */
1812                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1813                     scan.status == 0 &&                 /* NB: on-channel */
1814                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1815                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1816                         ic->ic_lastnonerp = ticks;
1817                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1818                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1819                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1820                                 IEEE80211_NOTE_FRAME(vap,
1821                                     IEEE80211_MSG_ASSOC, wh,
1822                                     "non-ERP present on channel %d "
1823                                     "(saw erp 0x%x from channel %d), "
1824                                     "enable use of protection",
1825                                     ic->ic_curchan->ic_ieee,
1826                                     scan.erp, scan.chan);
1827                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1828                                 ieee80211_notify_erp(ic);
1829                         }
1830                 }
1831                 /*
1832                  * Check beacon for non-HT station on HT channel
1833                  * and update HT BSS occupancy as appropriate.
1834                  */
1835                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1836                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1837                                 /*
1838                                  * Off control channel; only check frames
1839                                  * that come in the extension channel when
1840                                  * operating w/ HT40.
1841                                  */
1842                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1843                                         break;
1844                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1845                                         break;
1846                         }
1847                         if (scan.htinfo == NULL) {
1848                                 ieee80211_htprot_update(ic,
1849                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1850                                     IEEE80211_HTINFO_NONHT_PRESENT);
1851                         } else if (ishtmixed(scan.htinfo)) {
1852                                 /* XXX? take NONHT_PRESENT from beacon? */
1853                                 ieee80211_htprot_update(ic,
1854                                     IEEE80211_HTINFO_OPMODE_MIXED |
1855                                     IEEE80211_HTINFO_NONHT_PRESENT);
1856                         }
1857                 }
1858                 break;
1859         }
1860
1861         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1862                 if (vap->iv_state != IEEE80211_S_RUN) {
1863                         vap->iv_stats.is_rx_mgtdiscard++;
1864                         return;
1865                 }
1866                 /*
1867                  * Consult the ACL policy module if setup.
1868                  */
1869                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1870                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1871                             wh, NULL, "%s", "disallowed by ACL");
1872                         vap->iv_stats.is_rx_acl++;
1873                         return;
1874                 }
1875                 /*
1876                  * prreq frame format
1877                  *      [tlv] ssid
1878                  *      [tlv] supported rates
1879                  *      [tlv] extended supported rates
1880                  */
1881                 ssid = rates = xrates = NULL;
1882                 while (efrm - frm > 1) {
1883                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1884                         switch (*frm) {
1885                         case IEEE80211_ELEMID_SSID:
1886                                 ssid = frm;
1887                                 break;
1888                         case IEEE80211_ELEMID_RATES:
1889                                 rates = frm;
1890                                 break;
1891                         case IEEE80211_ELEMID_XRATES:
1892                                 xrates = frm;
1893                                 break;
1894                         }
1895                         frm += frm[1] + 2;
1896                 }
1897                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1898                 if (xrates != NULL)
1899                         IEEE80211_VERIFY_ELEMENT(xrates,
1900                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1901                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1902                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1903                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1904                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1905                             wh, NULL,
1906                             "%s", "no ssid with ssid suppression enabled");
1907                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1908                         return;
1909                 }
1910
1911                 /* XXX find a better class or define it's own */
1912                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1913                     "%s", "recv probe req");
1914                 /*
1915                  * Some legacy 11b clients cannot hack a complete
1916                  * probe response frame.  When the request includes
1917                  * only a bare-bones rate set, communicate this to
1918                  * the transmit side.
1919                  */
1920                 ieee80211_send_proberesp(vap, wh->i_addr2,
1921                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1922                 break;
1923
1924         case IEEE80211_FC0_SUBTYPE_AUTH: {
1925                 uint16_t algo, seq, status;
1926
1927                 if (vap->iv_state != IEEE80211_S_RUN) {
1928                         vap->iv_stats.is_rx_mgtdiscard++;
1929                         return;
1930                 }
1931                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1932                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1933                             wh, NULL, "%s", "wrong bssid");
1934                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1935                         return;
1936                 }
1937                 /*
1938                  * auth frame format
1939                  *      [2] algorithm
1940                  *      [2] sequence
1941                  *      [2] status
1942                  *      [tlv*] challenge
1943                  */
1944                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1945                 algo   = le16toh(*(uint16_t *)frm);
1946                 seq    = le16toh(*(uint16_t *)(frm + 2));
1947                 status = le16toh(*(uint16_t *)(frm + 4));
1948                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1949                     "recv auth frame with algorithm %d seq %d", algo, seq);
1950                 /*
1951                  * Consult the ACL policy module if setup.
1952                  */
1953                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1954                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1955                             wh, NULL, "%s", "disallowed by ACL");
1956                         vap->iv_stats.is_rx_acl++;
1957                         ieee80211_send_error(ni, wh->i_addr2,
1958                             IEEE80211_FC0_SUBTYPE_AUTH,
1959                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1960                         return;
1961                 }
1962                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1963                         IEEE80211_DISCARD(vap,
1964                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1965                             wh, NULL, "%s", "TKIP countermeasures enabled");
1966                         vap->iv_stats.is_rx_auth_countermeasures++;
1967                         ieee80211_send_error(ni, wh->i_addr2,
1968                                 IEEE80211_FC0_SUBTYPE_AUTH,
1969                                 IEEE80211_REASON_MIC_FAILURE);
1970                         return;
1971                 }
1972                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1973                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1974                             seq, status);
1975                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1976                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1977                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1978                         authalgreject(ni, wh, algo,
1979                             seq+1, IEEE80211_STATUS_ALG);
1980                         return;
1981                 } else {
1982                         /*
1983                          * We assume that an unknown algorithm is the result
1984                          * of a decryption failure on a shared key auth frame;
1985                          * return a status code appropriate for that instead
1986                          * of IEEE80211_STATUS_ALG.
1987                          *
1988                          * NB: a seq# of 4 is intentional; the decrypted
1989                          *     frame likely has a bogus seq value.
1990                          */
1991                         authalgreject(ni, wh, algo,
1992                             4, IEEE80211_STATUS_CHALLENGE);
1993                         return;
1994                 }
1995                 break;
1996         }
1997
1998         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1999         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
2000                 uint16_t capinfo, lintval;
2001                 struct ieee80211_rsnparms rsnparms;
2002
2003                 if (vap->iv_state != IEEE80211_S_RUN) {
2004                         vap->iv_stats.is_rx_mgtdiscard++;
2005                         return;
2006                 }
2007                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2008                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2009                             wh, NULL, "%s", "wrong bssid");
2010                         vap->iv_stats.is_rx_assoc_bss++;
2011                         return;
2012                 }
2013                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2014                         reassoc = 1;
2015                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2016                 } else {
2017                         reassoc = 0;
2018                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2019                 }
2020                 if (ni == vap->iv_bss) {
2021                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2022                             "deny %s request, sta not authenticated",
2023                             reassoc ? "reassoc" : "assoc");
2024                         ieee80211_send_error(ni, wh->i_addr2,
2025                             IEEE80211_FC0_SUBTYPE_DEAUTH,
2026                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
2027                         vap->iv_stats.is_rx_assoc_notauth++;
2028                         return;
2029                 }
2030
2031                 /*
2032                  * asreq frame format
2033                  *      [2] capability information
2034                  *      [2] listen interval
2035                  *      [6*] current AP address (reassoc only)
2036                  *      [tlv] ssid
2037                  *      [tlv] supported rates
2038                  *      [tlv] extended supported rates
2039                  *      [tlv] WPA or RSN
2040                  *      [tlv] HT capabilities
2041                  *      [tlv] Atheros capabilities
2042                  */
2043                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2044                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
2045                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
2046                 if (reassoc)
2047                         frm += 6;       /* ignore current AP info */
2048                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2049                 vhtcap = vhtinfo = NULL;
2050                 sfrm = frm;
2051                 while (efrm - frm > 1) {
2052                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2053                         switch (*frm) {
2054                         case IEEE80211_ELEMID_SSID:
2055                                 ssid = frm;
2056                                 break;
2057                         case IEEE80211_ELEMID_RATES:
2058                                 rates = frm;
2059                                 break;
2060                         case IEEE80211_ELEMID_XRATES:
2061                                 xrates = frm;
2062                                 break;
2063                         case IEEE80211_ELEMID_RSN:
2064                                 rsn = frm;
2065                                 break;
2066                         case IEEE80211_ELEMID_HTCAP:
2067                                 htcap = frm;
2068                                 break;
2069                         case IEEE80211_ELEMID_VHT_CAP:
2070                                 vhtcap = frm;
2071                                 break;
2072                         case IEEE80211_ELEMID_VHT_OPMODE:
2073                                 vhtinfo = frm;
2074                                 break;
2075                         case IEEE80211_ELEMID_VENDOR:
2076                                 if (iswpaoui(frm))
2077                                         wpa = frm;
2078                                 else if (iswmeinfo(frm))
2079                                         wme = frm;
2080 #ifdef IEEE80211_SUPPORT_SUPERG
2081                                 else if (isatherosoui(frm))
2082                                         ath = frm;
2083 #endif
2084                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2085                                         if (ishtcapoui(frm) && htcap == NULL)
2086                                                 htcap = frm;
2087                                 }
2088                                 break;
2089                         }
2090                         frm += frm[1] + 2;
2091                 }
2092                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2093                 if (xrates != NULL)
2094                         IEEE80211_VERIFY_ELEMENT(xrates,
2095                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2096                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2097                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2098                 if (htcap != NULL) {
2099                         IEEE80211_VERIFY_LENGTH(htcap[1],
2100                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2101                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2102                                  sizeof(struct ieee80211_ie_htcap)-2,
2103                              return);           /* XXX just NULL out? */
2104                 }
2105
2106                 /* Validate VHT IEs */
2107                 if (vhtcap != NULL) {
2108                         IEEE80211_VERIFY_LENGTH(vhtcap[1],
2109                             sizeof(struct ieee80211_ie_vhtcap) - 2,
2110                             return);
2111                 }
2112                 if (vhtinfo != NULL) {
2113                         IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2114                             sizeof(struct ieee80211_ie_vht_operation) - 2,
2115                             return);
2116                 }
2117
2118                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2119                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2120                         return;
2121                 /* discard challenge after association */
2122                 if (ni->ni_challenge != NULL) {
2123                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2124                         ni->ni_challenge = NULL;
2125                 }
2126                 /* NB: 802.11 spec says to ignore station's privacy bit */
2127                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2128                         capinfomismatch(ni, wh, reassoc, resp,
2129                             "capability", capinfo);
2130                         return;
2131                 }
2132                 /*
2133                  * Disallow re-associate w/ invalid slot time setting.
2134                  */
2135                 if (ni->ni_associd != 0 &&
2136                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2137                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2138                         capinfomismatch(ni, wh, reassoc, resp,
2139                             "slot time", capinfo);
2140                         return;
2141                 }
2142                 rate = ieee80211_setup_rates(ni, rates, xrates,
2143                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2144                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2145                 if (rate & IEEE80211_RATE_BASIC) {
2146                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2147                         vap->iv_stats.is_rx_assoc_norate++;
2148                         return;
2149                 }
2150                 /*
2151                  * If constrained to 11g-only stations reject an
2152                  * 11b-only station.  We cheat a bit here by looking
2153                  * at the max negotiated xmit rate and assuming anyone
2154                  * with a best rate <24Mb/s is an 11b station.
2155                  */
2156                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2157                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2158                         vap->iv_stats.is_rx_assoc_norate++;
2159                         return;
2160                 }
2161
2162                 /*
2163                  * Do HT rate set handling and setup HT node state.
2164                  */
2165                 ni->ni_chan = vap->iv_bss->ni_chan;
2166
2167                 /* VHT */
2168                 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2169                     vhtcap != NULL &&
2170                     vhtinfo != NULL) {
2171                         /* XXX TODO; see below */
2172                         printf("%s: VHT TODO!\n", __func__);
2173                         ieee80211_vht_node_init(ni);
2174                         ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2175                 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2176                         ieee80211_vht_node_cleanup(ni);
2177
2178                 /* HT */
2179                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2180                         rate = ieee80211_setup_htrates(ni, htcap,
2181                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2182                                 IEEE80211_F_DOBRS);
2183                         if (rate & IEEE80211_RATE_BASIC) {
2184                                 ratesetmismatch(ni, wh, reassoc, resp,
2185                                     "HT", rate);
2186                                 vap->iv_stats.is_ht_assoc_norate++;
2187                                 return;
2188                         }
2189                         ieee80211_ht_node_init(ni);
2190                         ieee80211_ht_updatehtcap(ni, htcap);
2191                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2192                         ieee80211_ht_node_cleanup(ni);
2193
2194                 /* Finally - this will use HT/VHT info to change node channel */
2195                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2196                         ieee80211_ht_updatehtcap_final(ni);
2197                 }
2198
2199 #ifdef IEEE80211_SUPPORT_SUPERG
2200                 /* Always do ff node cleanup; for A-MSDU */
2201                 ieee80211_ff_node_cleanup(ni);
2202 #endif
2203                 /*
2204                  * Allow AMPDU operation only with unencrypted traffic
2205                  * or AES-CCM; the 11n spec only specifies these ciphers
2206                  * so permitting any others is undefined and can lead
2207                  * to interoperability problems.
2208                  */
2209                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2210                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2211                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2212                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2213                         IEEE80211_NOTE(vap,
2214                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2215                             "disallow HT use because WEP or TKIP requested, "
2216                             "capinfo 0x%x ucastcipher %d", capinfo,
2217                             rsnparms.rsn_ucastcipher);
2218                         ieee80211_ht_node_cleanup(ni);
2219 #ifdef IEEE80211_SUPPORT_SUPERG
2220                         /* Always do ff node cleanup; for A-MSDU */
2221                         ieee80211_ff_node_cleanup(ni);
2222 #endif
2223                         vap->iv_stats.is_ht_assoc_downgrade++;
2224                 }
2225                 /*
2226                  * If constrained to 11n-only stations reject legacy stations.
2227                  */
2228                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2229                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2230                         htcapmismatch(ni, wh, reassoc, resp);
2231                         vap->iv_stats.is_ht_assoc_nohtcap++;
2232                         return;
2233                 }
2234                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2235                 ni->ni_noise = nf;
2236                 ni->ni_intval = lintval;
2237                 ni->ni_capinfo = capinfo;
2238                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2239                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2240                 /*
2241                  * Store the IEs.
2242                  * XXX maybe better to just expand
2243                  */
2244                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2245 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2246                         if (wpa != NULL)
2247                                 setie(wpa_ie, wpa - sfrm);
2248                         if (rsn != NULL)
2249                                 setie(rsn_ie, rsn - sfrm);
2250                         if (htcap != NULL)
2251                                 setie(htcap_ie, htcap - sfrm);
2252                         if (wme != NULL) {
2253                                 setie(wme_ie, wme - sfrm);
2254                                 /*
2255                                  * Mark node as capable of QoS.
2256                                  */
2257                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2258                         } else
2259                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2260 #ifdef IEEE80211_SUPPORT_SUPERG
2261                         if (ath != NULL) {
2262                                 setie(ath_ie, ath - sfrm);
2263                                 /*
2264                                  * Parse ATH station parameters.
2265                                  */
2266                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2267                         } else
2268 #endif
2269                                 ni->ni_ath_flags = 0;
2270 #undef setie
2271                 } else {
2272                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2273                         ni->ni_ath_flags = 0;
2274                 }
2275                 ieee80211_node_join(ni, resp);
2276                 ieee80211_deliver_l2uf(ni);
2277                 break;
2278         }
2279
2280         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2281         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2282                 uint16_t reason;
2283
2284                 if (vap->iv_state != IEEE80211_S_RUN ||
2285                     /* NB: can happen when in promiscuous mode */
2286                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2287                         vap->iv_stats.is_rx_mgtdiscard++;
2288                         break;
2289                 }
2290                 /*
2291                  * deauth/disassoc frame format
2292                  *      [2] reason
2293                  */
2294                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2295                 reason = le16toh(*(uint16_t *)frm);
2296                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2297                         vap->iv_stats.is_rx_deauth++;
2298                         IEEE80211_NODE_STAT(ni, rx_deauth);
2299                 } else {
2300                         vap->iv_stats.is_rx_disassoc++;
2301                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2302                 }
2303                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2304                     "recv %s (reason: %d (%s))",
2305                     ieee80211_mgt_subtype_name(subtype),
2306                     reason, ieee80211_reason_to_string(reason));
2307                 if (ni != vap->iv_bss)
2308                         ieee80211_node_leave(ni);
2309                 break;
2310         }
2311
2312         case IEEE80211_FC0_SUBTYPE_ACTION:
2313         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2314                 if (ni == vap->iv_bss) {
2315                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2316                             wh, NULL, "%s", "unknown node");
2317                         vap->iv_stats.is_rx_mgtdiscard++;
2318                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2319                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2320                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2321                             wh, NULL, "%s", "not for us");
2322                         vap->iv_stats.is_rx_mgtdiscard++;
2323                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2324                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2325                             wh, NULL, "wrong state %s",
2326                             ieee80211_state_name[vap->iv_state]);
2327                         vap->iv_stats.is_rx_mgtdiscard++;
2328                 } else {
2329                         if (ieee80211_parse_action(ni, m0) == 0)
2330                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2331                 }
2332                 break;
2333
2334         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2335         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2336         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2337         case IEEE80211_FC0_SUBTYPE_ATIM:
2338                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2339                     wh, NULL, "%s", "not handled");
2340                 vap->iv_stats.is_rx_mgtdiscard++;
2341                 break;
2342
2343         default:
2344                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2345                     wh, "mgt", "subtype 0x%x not handled", subtype);
2346                 vap->iv_stats.is_rx_badsubtype++;
2347                 break;
2348         }
2349 }
2350
2351 static void
2352 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2353 {
2354         switch (subtype) {
2355         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2356                 ni->ni_vap->iv_recv_pspoll(ni, m);
2357                 break;
2358         case IEEE80211_FC0_SUBTYPE_BAR:
2359                 ieee80211_recv_bar(ni, m);
2360                 break;
2361         }
2362 }
2363
2364 /*
2365  * Process a received ps-poll frame.
2366  */
2367 void
2368 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2369 {
2370         struct ieee80211vap *vap = ni->ni_vap;
2371         struct ieee80211com *ic = vap->iv_ic;
2372         struct ieee80211_frame_min *wh;
2373         struct mbuf *m;
2374         uint16_t aid;
2375         int qlen;
2376
2377         wh = mtod(m0, struct ieee80211_frame_min *);
2378         if (ni->ni_associd == 0) {
2379                 IEEE80211_DISCARD(vap,
2380                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2381                     (struct ieee80211_frame *) wh, NULL,
2382                     "%s", "unassociated station");
2383                 vap->iv_stats.is_ps_unassoc++;
2384                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2385                         IEEE80211_REASON_NOT_ASSOCED);
2386                 return;
2387         }
2388
2389         aid = le16toh(*(uint16_t *)wh->i_dur);
2390         if (aid != ni->ni_associd) {
2391                 IEEE80211_DISCARD(vap,
2392                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2393                     (struct ieee80211_frame *) wh, NULL,
2394                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2395                     ni->ni_associd, aid);
2396                 vap->iv_stats.is_ps_badaid++;
2397                 /*
2398                  * NB: We used to deauth the station but it turns out
2399                  * the Blackberry Curve 8230 (and perhaps other devices)
2400                  * sometimes send the wrong AID when WME is negotiated.
2401                  * Being more lenient here seems ok as we already check
2402                  * the station is associated and we only return frames
2403                  * queued for the station (i.e. we don't use the AID).
2404                  */
2405                 return;
2406         }
2407
2408         /* Okay, take the first queued packet and put it out... */
2409         m = ieee80211_node_psq_dequeue(ni, &qlen);
2410         if (m == NULL) {
2411                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2412                     "%s", "recv ps-poll, but queue empty");
2413                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2414                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2415                 if (vap->iv_set_tim != NULL)
2416                         vap->iv_set_tim(ni, 0); /* just in case */
2417                 return;
2418         }
2419         /*
2420          * If there are more packets, set the more packets bit
2421          * in the packet dispatched to the station; otherwise
2422          * turn off the TIM bit.
2423          */
2424         if (qlen != 0) {
2425                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2426                     "recv ps-poll, send packet, %u still queued", qlen);
2427                 m->m_flags |= M_MORE_DATA;
2428         } else {
2429                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2430                     "%s", "recv ps-poll, send packet, queue empty");
2431                 if (vap->iv_set_tim != NULL)
2432                         vap->iv_set_tim(ni, 0);
2433         }
2434         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2435
2436         /*
2437          * Do the right thing; if it's an encap'ed frame then
2438          * call ieee80211_parent_xmitpkt() else
2439          * call ieee80211_vap_xmitpkt().
2440          */
2441         if (m->m_flags & M_ENCAP) {
2442                 (void) ieee80211_parent_xmitpkt(ic, m);
2443         } else {
2444                 (void) ieee80211_vap_xmitpkt(vap, m);
2445         }
2446 }