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 = ieee80211_getqos(wh)[0];
 713                 else
 714                         qos = 0;
 715
 716                 /*
 717                  * Next up, any fragmentation.
 718                  */
 719                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 720                         m = ieee80211_defrag(ni, m, hdrspace);
 721                         if (m == NULL) {
 722                                 /* Fragment dropped or frame not complete yet */
 723                                 goto out;
 724                         }
 725                 }
 726                 wh = NULL;              /* no longer valid, catch any uses */
 727
 728                 /*
 729                  * Next strip any MSDU crypto bits.
 730                  */
 731                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 732                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 733                             ni->ni_macaddr, "data", "%s", "demic error");
 734                         vap->iv_stats.is_rx_demicfail++;
 735                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 736                         goto out;
 737                 }
 738                 /* copy to listener after decrypt */
 739                 if (ieee80211_radiotap_active_vap(vap))
 740                         ieee80211_radiotap_rx(vap, m);
 741                 need_tap = 0;
 742                 /*
 743                  * Finally, strip the 802.11 header.
 744                  */
 745                 m = ieee80211_decap(vap, m, hdrspace);
 746                 if (m == NULL) {
 747                         /* XXX mask bit to check for both */
 748                         /* don't count Null data frames as errors */
 749                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 750                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 751                                 goto out;
 752                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 753                             ni->ni_macaddr, "data", "%s", "decap error");
 754                         vap->iv_stats.is_rx_decap++;
 755                         IEEE80211_NODE_STAT(ni, rx_decap);
 756                         goto err;
 757                 }
 758                 eh = mtod(m, struct ether_header *);
 759                 if (!ieee80211_node_is_authorized(ni)) {
 760                         /*
 761                          * Deny any non-PAE frames received prior to
 762                          * authorization.  For open/shared-key
 763                          * authentication the port is mark authorized
 764                          * after authentication completes.  For 802.1x
 765                          * the port is not marked authorized by the
 766                          * authenticator until the handshake has completed.
 767                          */
 768                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 769                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 770                                     eh->ether_shost, "data",
 771                                     "unauthorized port: ether type 0x%x len %u",
 772                                     eh->ether_type, m->m_pkthdr.len);
 773                                 vap->iv_stats.is_rx_unauth++;
 774                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 775                                 goto err;
 776                         }
 777                 } else {
 778                         /*
 779                          * When denying unencrypted frames, discard
 780                          * any non-PAE frames received without encryption.
 781                          */
 782                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 783                             ((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
 784                             (is_hw_decrypted == 0) &&
 785                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 786                                 /*
 787                                  * Drop unencrypted frames.
 788                                  */
 789                                 vap->iv_stats.is_rx_unencrypted++;
 790                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 791                                 goto out;
 792                         }
 793                 }
 794                 /* XXX require HT? */
 795                 if (qos & IEEE80211_QOS_AMSDU) {
 796                         m = ieee80211_decap_amsdu(ni, m);
 797                         if (m == NULL)
 798                                 return IEEE80211_FC0_TYPE_DATA;
 799                 } else {
 800 #ifdef IEEE80211_SUPPORT_SUPERG
 801                         m = ieee80211_decap_fastframe(vap, ni, m);
 802                         if (m == NULL)
 803                                 return IEEE80211_FC0_TYPE_DATA;
 804 #endif
 805                 }
 806                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
 807                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
 808                 else
 809                         hostap_deliver_data(vap, ni, m);
 810                 return IEEE80211_FC0_TYPE_DATA;
 811
 812         case IEEE80211_FC0_TYPE_MGT:
 813                 vap->iv_stats.is_rx_mgmt++;
 814                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 815                 if (dir != IEEE80211_FC1_DIR_NODS) {
 816                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 817                             wh, "mgt", "incorrect dir 0x%x", dir);
 818                         vap->iv_stats.is_rx_wrongdir++;
 819                         goto err;
 820                 }
 821                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 822                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 823                             ni->ni_macaddr, "mgt", "too short: len %u",
 824                             m->m_pkthdr.len);
 825                         vap->iv_stats.is_rx_tooshort++;
 826                         goto out;
 827                 }
 828                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
 829                         /* ensure return frames are unicast */
 830                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 831                             wh, NULL, "source is multicast: %s",
 832                             ether_sprintf(wh->i_addr2));
 833                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
 834                         goto out;
 835                 }
 836 #ifdef IEEE80211_DEBUG
 837                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
 838                     ieee80211_msg_dumppkts(vap)) {
 839                         if_printf(ifp, "received %s from %s rssi %d\n",
 840                             ieee80211_mgt_subtype_name(subtype),
 841                             ether_sprintf(wh->i_addr2), rssi);
 842                 }
 843 #endif
 844                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 845                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
 846                                 /*
 847                                  * Only shared key auth frames with a challenge
 848                                  * should be encrypted, discard all others.
 849                                  */
 850                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 851                                     wh, NULL,
 852                                     "%s", "WEP set but not permitted");
 853                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 854                                 goto out;
 855                         }
 856                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 857                                 /*
 858                                  * Discard encrypted frames when privacy is off.
 859                                  */
 860                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 861                                     wh, NULL, "%s", "WEP set but PRIVACY off");
 862                                 vap->iv_stats.is_rx_noprivacy++;
 863                                 goto out;
 864                         }
 865                         hdrspace = ieee80211_hdrspace(ic, wh);
 866                         if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
 867                                 /* NB: stats+msgs handled in crypto_decap */
 868                                 goto out;
 869                         }
 870                         wh = mtod(m, struct ieee80211_frame *);
 871                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 872                         has_decrypted = 1;
 873                 }
 874                 /*
 875                  * Pass the packet to radiotap before calling iv_recv_mgmt().
 876                  * Otherwise iv_recv_mgmt() might pass another packet to
 877                  * radiotap, resulting in out of order packet captures.
 878                  */
 879                 if (ieee80211_radiotap_active_vap(vap))
 880                         ieee80211_radiotap_rx(vap, m);
 881                 need_tap = 0;
 882                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 883                 goto out;
 884
 885         case IEEE80211_FC0_TYPE_CTL:
 886                 vap->iv_stats.is_rx_ctl++;
 887                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 888                 vap->iv_recv_ctl(ni, m, subtype);
 889                 goto out;
 890         default:
 891                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 892                     wh, "bad", "frame type 0x%x", type);
 893                 /* should not come here */
 894                 break;
 895         }
 896 err:
 897         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 898 out:
 899         if (m != NULL) {
 900                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 901                         ieee80211_radiotap_rx(vap, m);
 902                 m_freem(m);
 903         }
 904         return type;
 905 }
 906
 907 static void
 908 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 909     int rssi, int nf, uint16_t seq, uint16_t status)
 910 {
 911         struct ieee80211vap *vap = ni->ni_vap;
 912
 913         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 914
 915         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
 916                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 917                     ni->ni_macaddr, "open auth",
 918                     "bad sta auth mode %u", ni->ni_authmode);
 919                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
 920                 /*
 921                  * Clear any challenge text that may be there if
 922                  * a previous shared key auth failed and then an
 923                  * open auth is attempted.
 924                  */
 925                 if (ni->ni_challenge != NULL) {
 926                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
 927                         ni->ni_challenge = NULL;
 928                 }
 929                 /* XXX hack to workaround calling convention */
 930                 ieee80211_send_error(ni, wh->i_addr2,
 931                     IEEE80211_FC0_SUBTYPE_AUTH,
 932                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
 933                 return;
 934         }
 935         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
 936                 vap->iv_stats.is_rx_bad_auth++;
 937                 return;
 938         }
 939         /* always accept open authentication requests */
 940         if (ni == vap->iv_bss) {
 941                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
 942                 if (ni == NULL)
 943                         return;
 944         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 945                 (void) ieee80211_ref_node(ni);
 946         /*
 947          * Mark the node as referenced to reflect that it's
 948          * reference count has been bumped to insure it remains
 949          * after the transaction completes.
 950          */
 951         ni->ni_flags |= IEEE80211_NODE_AREF;
 952         /*
 953          * Mark the node as requiring a valid association id
 954          * before outbound traffic is permitted.
 955          */
 956         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 957
 958         if (vap->iv_acl != NULL &&
 959             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 960                 /*
 961                  * When the ACL policy is set to RADIUS we defer the
 962                  * authorization to a user agent.  Dispatch an event,
 963                  * a subsequent MLME call will decide the fate of the
 964                  * station.  If the user agent is not present then the
 965                  * node will be reclaimed due to inactivity.
 966                  */
 967                 IEEE80211_NOTE_MAC(vap,
 968                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
 969                     "%s", "station authentication defered (radius acl)");
 970                 ieee80211_notify_node_auth(ni);
 971         } else {
 972                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 973                 IEEE80211_NOTE_MAC(vap,
 974                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
 975                     "%s", "station authenticated (open)");
 976                 /*
 977                  * When 802.1x is not in use mark the port
 978                  * authorized at this point so traffic can flow.
 979                  */
 980                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 981                         ieee80211_node_authorize(ni);
 982         }
 983 }
 984
 985 static void
 986 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
 987     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
 988     uint16_t seq, uint16_t status)
 989 {
 990         struct ieee80211vap *vap = ni->ni_vap;
 991         uint8_t *challenge;
 992         int allocbs, estatus;
 993
 994         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 995
 996         /*
 997          * NB: this can happen as we allow pre-shared key
 998          * authentication to be enabled w/o wep being turned
 999          * on so that configuration of these can be done
1000          * in any order.  It may be better to enforce the
1001          * ordering in which case this check would just be
1002          * for sanity/consistency.
1003          */
1004         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
1005                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1006                     ni->ni_macaddr, "shared key auth",
1007                     "%s", " PRIVACY is disabled");
1008                 estatus = IEEE80211_STATUS_ALG;
1009                 goto bad;
1010         }
1011         /*
1012          * Pre-shared key authentication is evil; accept
1013          * it only if explicitly configured (it is supported
1014          * mainly for compatibility with clients like Mac OS X).
1015          */
1016         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
1017             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
1018                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1019                     ni->ni_macaddr, "shared key auth",
1020                     "bad sta auth mode %u", ni->ni_authmode);
1021                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
1022                 estatus = IEEE80211_STATUS_ALG;
1023                 goto bad;
1024         }
1025
1026         challenge = NULL;
1027         if (frm + 1 < efrm) {
1028                 if ((frm[1] + 2) > (efrm - frm)) {
1029                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1030                             ni->ni_macaddr, "shared key auth",
1031                             "ie %d/%d too long",
1032                             frm[0], (frm[1] + 2) - (efrm - frm));
1033                         vap->iv_stats.is_rx_bad_auth++;
1034                         estatus = IEEE80211_STATUS_CHALLENGE;
1035                         goto bad;
1036                 }
1037                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
1038                         challenge = frm;
1039                 frm += frm[1] + 2;
1040         }
1041         switch (seq) {
1042         case IEEE80211_AUTH_SHARED_CHALLENGE:
1043         case IEEE80211_AUTH_SHARED_RESPONSE:
1044                 if (challenge == NULL) {
1045                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1046                             ni->ni_macaddr, "shared key auth",
1047                             "%s", "no challenge");
1048                         vap->iv_stats.is_rx_bad_auth++;
1049                         estatus = IEEE80211_STATUS_CHALLENGE;
1050                         goto bad;
1051                 }
1052                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
1053                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1054                             ni->ni_macaddr, "shared key auth",
1055                             "bad challenge len %d", challenge[1]);
1056                         vap->iv_stats.is_rx_bad_auth++;
1057                         estatus = IEEE80211_STATUS_CHALLENGE;
1058                         goto bad;
1059                 }
1060         default:
1061                 break;
1062         }
1063         switch (seq) {
1064         case IEEE80211_AUTH_SHARED_REQUEST:
1065                 if (ni == vap->iv_bss) {
1066                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
1067                         if (ni == NULL) {
1068                                 /* NB: no way to return an error */
1069                                 return;
1070                         }
1071                         allocbs = 1;
1072                 } else {
1073                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
1074                                 (void) ieee80211_ref_node(ni);
1075                         allocbs = 0;
1076                 }
1077                 /*
1078                  * Mark the node as referenced to reflect that it's
1079                  * reference count has been bumped to insure it remains
1080                  * after the transaction completes.
1081                  */
1082                 ni->ni_flags |= IEEE80211_NODE_AREF;
1083                 /*
1084                  * Mark the node as requiring a valid association id
1085                  * before outbound traffic is permitted.
1086                  */
1087                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
1088                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
1089                 ni->ni_noise = nf;
1090                 if (!ieee80211_alloc_challenge(ni)) {
1091                         /* NB: don't return error so they rexmit */
1092                         return;
1093                 }
1094                 get_random_bytes(ni->ni_challenge,
1095                         IEEE80211_CHALLENGE_LEN);
1096                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1097                     ni, "shared key %sauth request", allocbs ? "" : "re");
1098                 /*
1099                  * When the ACL policy is set to RADIUS we defer the
1100                  * authorization to a user agent.  Dispatch an event,
1101                  * a subsequent MLME call will decide the fate of the
1102                  * station.  If the user agent is not present then the
1103                  * node will be reclaimed due to inactivity.
1104                  */
1105                 if (vap->iv_acl != NULL &&
1106                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
1107                         IEEE80211_NOTE_MAC(vap,
1108                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
1109                             ni->ni_macaddr,
1110                             "%s", "station authentication defered (radius acl)");
1111                         ieee80211_notify_node_auth(ni);
1112                         return;
1113                 }
1114                 break;
1115         case IEEE80211_AUTH_SHARED_RESPONSE:
1116                 if (ni == vap->iv_bss) {
1117                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1118                             ni->ni_macaddr, "shared key response",
1119                             "%s", "unknown station");
1120                         /* NB: don't send a response */
1121                         return;
1122                 }
1123                 if (ni->ni_challenge == NULL) {
1124                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1125                             ni->ni_macaddr, "shared key response",
1126                             "%s", "no challenge recorded");
1127                         vap->iv_stats.is_rx_bad_auth++;
1128                         estatus = IEEE80211_STATUS_CHALLENGE;
1129                         goto bad;
1130                 }
1131                 if (memcmp(ni->ni_challenge, &challenge[2],
1132                            challenge[1]) != 0) {
1133                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1134                             ni->ni_macaddr, "shared key response",
1135                             "%s", "challenge mismatch");
1136                         vap->iv_stats.is_rx_auth_fail++;
1137                         estatus = IEEE80211_STATUS_CHALLENGE;
1138                         goto bad;
1139                 }
1140                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
1141                     ni, "%s", "station authenticated (shared key)");
1142                 ieee80211_node_authorize(ni);
1143                 break;
1144         default:
1145                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
1146                     ni->ni_macaddr, "shared key auth",
1147                     "bad seq %d", seq);
1148                 vap->iv_stats.is_rx_bad_auth++;
1149                 estatus = IEEE80211_STATUS_SEQUENCE;
1150                 goto bad;
1151         }
1152         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
1153         return;
1154 bad:
1155         /*
1156          * Send an error response; but only when operating as an AP.
1157          */
1158         /* XXX hack to workaround calling convention */
1159         ieee80211_send_error(ni, wh->i_addr2,
1160             IEEE80211_FC0_SUBTYPE_AUTH,
1161             (seq + 1) | (estatus<<16));
1162 }
1163
1164 /*
1165  * Convert a WPA cipher selector OUI to an internal
1166  * cipher algorithm.  Where appropriate we also
1167  * record any key length.
1168  */
1169 static int
1170 wpa_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1171 {
1172 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1173         uint32_t w = le32dec(sel);
1174
1175         switch (w) {
1176         case WPA_SEL(WPA_CSE_NULL):
1177                 *cipher = IEEE80211_CIPHER_NONE;
1178                 break;
1179         case WPA_SEL(WPA_CSE_WEP40):
1180                 if (keylen)
1181                         *keylen = 40 / NBBY;
1182                 *cipher = IEEE80211_CIPHER_WEP;
1183                 break;
1184         case WPA_SEL(WPA_CSE_WEP104):
1185                 if (keylen)
1186                         *keylen = 104 / NBBY;
1187                 *cipher = IEEE80211_CIPHER_WEP;
1188                 break;
1189         case WPA_SEL(WPA_CSE_TKIP):
1190                 *cipher = IEEE80211_CIPHER_TKIP;
1191                 break;
1192         case WPA_SEL(WPA_CSE_CCMP):
1193                 *cipher = IEEE80211_CIPHER_AES_CCM;
1194                 break;
1195         default:
1196                 return (EINVAL);
1197         }
1198
1199         return (0);
1200 #undef WPA_SEL
1201 }
1202
1203 /*
1204  * Convert a WPA key management/authentication algorithm
1205  * to an internal code.
1206  */
1207 static int
1208 wpa_keymgmt(const uint8_t *sel)
1209 {
1210 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
1211         uint32_t w = le32dec(sel);
1212
1213         switch (w) {
1214         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
1215                 return WPA_ASE_8021X_UNSPEC;
1216         case WPA_SEL(WPA_ASE_8021X_PSK):
1217                 return WPA_ASE_8021X_PSK;
1218         case WPA_SEL(WPA_ASE_NONE):
1219                 return WPA_ASE_NONE;
1220         }
1221         return 0;               /* NB: so is discarded */
1222 #undef WPA_SEL
1223 }
1224
1225 /*
1226  * Parse a WPA information element to collect parameters.
1227  * Note that we do not validate security parameters; that
1228  * is handled by the authenticator; the parsing done here
1229  * is just for internal use in making operational decisions.
1230  */
1231 static int
1232 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
1233         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1234 {
1235         uint8_t len = frm[1];
1236         uint32_t w;
1237         int error, n;
1238
1239         /*
1240          * Check the length once for fixed parts: OUI, type,
1241          * version, mcast cipher, and 2 selector counts.
1242          * Other, variable-length data, must be checked separately.
1243          */
1244         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
1245                 IEEE80211_DISCARD_IE(vap,
1246                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1247                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
1248                 return IEEE80211_REASON_IE_INVALID;
1249         }
1250         if (len < 14) {
1251                 IEEE80211_DISCARD_IE(vap,
1252                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1253                     wh, "WPA", "too short, len %u", len);
1254                 return IEEE80211_REASON_IE_INVALID;
1255         }
1256         frm += 6, len -= 4;             /* NB: len is payload only */
1257         /* NB: iswpaoui already validated the OUI and type */
1258         w = le16dec(frm);
1259         if (w != WPA_VERSION) {
1260                 IEEE80211_DISCARD_IE(vap,
1261                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1262                     wh, "WPA", "bad version %u", w);
1263                 return IEEE80211_REASON_IE_INVALID;
1264         }
1265         frm += 2, len -= 2;
1266
1267         memset(rsn, 0, sizeof(*rsn));
1268
1269         /* multicast/group cipher */
1270         error = wpa_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1271         if (error != 0) {
1272                 IEEE80211_DISCARD_IE(vap,
1273                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1274                     wh, "WPA", "unknown mcast cipher suite %08X",
1275                     le32dec(frm));
1276                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1277         }
1278         frm += 4, len -= 4;
1279
1280         /* unicast ciphers */
1281         n = le16dec(frm);
1282         frm += 2, len -= 2;
1283         if (len < n*4+2) {
1284                 IEEE80211_DISCARD_IE(vap,
1285                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1286                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
1287                     len, n);
1288                 return IEEE80211_REASON_IE_INVALID;
1289         }
1290         w = 0;
1291         for (; n > 0; n--) {
1292                 uint8_t cipher;
1293
1294                 error = wpa_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1295                 if (error == 0)
1296                         w |= 1 << cipher;
1297
1298                 frm += 4, len -= 4;
1299         }
1300         if (w == 0) {
1301                 IEEE80211_DISCARD_IE(vap,
1302                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1303                     wh, "WPA", "no usable pairwise cipher suite found (w=%d)",
1304                     w);
1305                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1306         }
1307         /* XXX other? */
1308         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1309                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1310         else
1311                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1312
1313         /* key management algorithms */
1314         n = le16dec(frm);
1315         frm += 2, len -= 2;
1316         if (len < n*4) {
1317                 IEEE80211_DISCARD_IE(vap,
1318                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1319                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
1320                     len, n);
1321                 return IEEE80211_REASON_IE_INVALID;
1322         }
1323         w = 0;
1324         for (; n > 0; n--) {
1325                 w |= wpa_keymgmt(frm);
1326                 frm += 4, len -= 4;
1327         }
1328         if (w & WPA_ASE_8021X_UNSPEC)
1329                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
1330         else
1331                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
1332
1333         if (len > 2)            /* optional capabilities */
1334                 rsn->rsn_caps = le16dec(frm);
1335
1336         return 0;
1337 }
1338
1339 /*
1340  * Convert an RSN cipher selector OUI to an internal
1341  * cipher algorithm.  Where appropriate we also
1342  * record any key length.
1343  */
1344 static int
1345 rsn_cipher(const uint8_t *sel, uint8_t *keylen, uint8_t *cipher)
1346 {
1347 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1348         uint32_t w = le32dec(sel);
1349
1350         switch (w) {
1351         case RSN_SEL(RSN_CSE_NULL):
1352                 *cipher = IEEE80211_CIPHER_NONE;
1353                 break;
1354         case RSN_SEL(RSN_CSE_WEP40):
1355                 if (keylen)
1356                         *keylen = 40 / NBBY;
1357                 *cipher = IEEE80211_CIPHER_WEP;
1358                 break;
1359         case RSN_SEL(RSN_CSE_WEP104):
1360                 if (keylen)
1361                         *keylen = 104 / NBBY;
1362                 *cipher = IEEE80211_CIPHER_WEP;
1363                 break;
1364         case RSN_SEL(RSN_CSE_TKIP):
1365                 *cipher = IEEE80211_CIPHER_TKIP;
1366                 break;
1367         case RSN_SEL(RSN_CSE_CCMP):
1368                 *cipher = IEEE80211_CIPHER_AES_CCM;
1369                 break;
1370         case RSN_SEL(RSN_CSE_WRAP):
1371                 *cipher = IEEE80211_CIPHER_AES_OCB;
1372                 break;
1373         default:
1374                 return (EINVAL);
1375         }
1376
1377         return (0);
1378 #undef WPA_SEL
1379 }
1380
1381 /*
1382  * Convert an RSN key management/authentication algorithm
1383  * to an internal code.
1384  */
1385 static int
1386 rsn_keymgmt(const uint8_t *sel)
1387 {
1388 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
1389         uint32_t w = le32dec(sel);
1390
1391         switch (w) {
1392         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
1393                 return RSN_ASE_8021X_UNSPEC;
1394         case RSN_SEL(RSN_ASE_8021X_PSK):
1395                 return RSN_ASE_8021X_PSK;
1396         case RSN_SEL(RSN_ASE_NONE):
1397                 return RSN_ASE_NONE;
1398         }
1399         return 0;               /* NB: so is discarded */
1400 #undef RSN_SEL
1401 }
1402
1403 /*
1404  * Parse a WPA/RSN information element to collect parameters
1405  * and validate the parameters against what has been
1406  * configured for the system.
1407  */
1408 static int
1409 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
1410         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
1411 {
1412         uint8_t len = frm[1];
1413         uint32_t w;
1414         int error, n;
1415
1416         /*
1417          * Check the length once for fixed parts:
1418          * version, mcast cipher, and 2 selector counts.
1419          * Other, variable-length data, must be checked separately.
1420          */
1421         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
1422                 IEEE80211_DISCARD_IE(vap,
1423                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1424                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
1425                 return IEEE80211_REASON_IE_INVALID;
1426         }
1427         /* XXX may be shorter */
1428         if (len < 10) {
1429                 IEEE80211_DISCARD_IE(vap,
1430                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1431                     wh, "RSN", "too short, len %u", len);
1432                 return IEEE80211_REASON_IE_INVALID;
1433         }
1434         frm += 2;
1435         w = le16dec(frm);
1436         if (w != RSN_VERSION) {
1437                 IEEE80211_DISCARD_IE(vap,
1438                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1439                     wh, "RSN", "bad version %u", w);
1440                 return IEEE80211_REASON_UNSUPP_RSN_IE_VERSION;
1441         }
1442         frm += 2, len -= 2;
1443
1444         memset(rsn, 0, sizeof(*rsn));
1445
1446         /* multicast/group cipher */
1447         error = rsn_cipher(frm, &rsn->rsn_mcastkeylen, &rsn->rsn_mcastcipher);
1448         if (error != 0) {
1449                 IEEE80211_DISCARD_IE(vap,
1450                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1451                     wh, "RSN", "unknown mcast cipher suite %08X",
1452                     le32dec(frm));
1453                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1454         }
1455         if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_NONE) {
1456                 IEEE80211_DISCARD_IE(vap,
1457                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1458                     wh, "RSN", "invalid mcast cipher suite %d",
1459                     rsn->rsn_mcastcipher);
1460                 return IEEE80211_REASON_GROUP_CIPHER_INVALID;
1461         }
1462         frm += 4, len -= 4;
1463
1464         /* unicast ciphers */
1465         n = le16dec(frm);
1466         frm += 2, len -= 2;
1467         if (len < n*4+2) {
1468                 IEEE80211_DISCARD_IE(vap,
1469                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1470                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
1471                     len, n);
1472                 return IEEE80211_REASON_IE_INVALID;
1473         }
1474         w = 0;
1475
1476         for (; n > 0; n--) {
1477                 uint8_t cipher;
1478
1479                 error = rsn_cipher(frm, &rsn->rsn_ucastkeylen, &cipher);
1480                 if (error == 0)
1481                         w |= 1 << cipher;
1482
1483                 frm += 4, len -= 4;
1484         }
1485         if (w & (1 << IEEE80211_CIPHER_AES_CCM))
1486                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
1487         else if (w & (1 << IEEE80211_CIPHER_AES_OCB))
1488                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_OCB;
1489         else if (w & (1 << IEEE80211_CIPHER_TKIP))
1490                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
1491         else if ((w & (1 << IEEE80211_CIPHER_NONE)) &&
1492             (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP ||
1493              rsn->rsn_mcastcipher == IEEE80211_CIPHER_TKIP))
1494                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_NONE;
1495         else {
1496                 IEEE80211_DISCARD_IE(vap,
1497                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1498                     wh, "RSN", "no usable pairwise cipher suite found (w=%d)",
1499                     w);
1500                 return IEEE80211_REASON_PAIRWISE_CIPHER_INVALID;
1501         }
1502
1503         /* key management algorithms */
1504         n = le16dec(frm);
1505         frm += 2, len -= 2;
1506         if (len < n*4) {
1507                 IEEE80211_DISCARD_IE(vap,
1508                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
1509                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
1510                     len, n);
1511                 return IEEE80211_REASON_IE_INVALID;
1512         }
1513         w = 0;
1514         for (; n > 0; n--) {
1515                 w |= rsn_keymgmt(frm);
1516                 frm += 4, len -= 4;
1517         }
1518         if (w & RSN_ASE_8021X_UNSPEC)
1519                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
1520         else
1521                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
1522
1523         /* optional RSN capabilities */
1524         if (len > 2)
1525                 rsn->rsn_caps = le16dec(frm);
1526         /* XXXPMKID */
1527
1528         return 0;
1529 }
1530
1531 /*
1532  * WPA/802.11i association request processing.
1533  */
1534 static int
1535 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
1536         const struct ieee80211_frame *wh, const uint8_t *wpa,
1537         const uint8_t *rsn, uint16_t capinfo)
1538 {
1539         struct ieee80211vap *vap = ni->ni_vap;
1540         uint8_t reason;
1541         int badwparsn;
1542
1543         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
1544         if (wpa == NULL && rsn == NULL) {
1545                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
1546                         /*
1547                          * W-Fi Protected Setup (WPS) permits
1548                          * clients to associate and pass EAPOL frames
1549                          * to establish initial credentials.
1550                          */
1551                         ni->ni_flags |= IEEE80211_NODE_WPS;
1552                         return 1;
1553                 }
1554                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
1555                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
1556                         /*
1557                          * Transitional Security Network.  Permits clients
1558                          * to associate and use WEP while WPA is configured.
1559                          */
1560                         ni->ni_flags |= IEEE80211_NODE_TSN;
1561                         return 1;
1562                 }
1563                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1564                     wh, NULL, "%s", "no WPA/RSN IE in association request");
1565                 vap->iv_stats.is_rx_assoc_badwpaie++;
1566                 reason = IEEE80211_REASON_IE_INVALID;
1567                 goto bad;
1568         }
1569         /* assert right association security credentials */
1570         badwparsn = 0;                  /* NB: to silence compiler */
1571         switch (vap->iv_flags & IEEE80211_F_WPA) {
1572         case IEEE80211_F_WPA1:
1573                 badwparsn = (wpa == NULL);
1574                 break;
1575         case IEEE80211_F_WPA2:
1576                 badwparsn = (rsn == NULL);
1577                 break;
1578         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
1579                 badwparsn = (wpa == NULL && rsn == NULL);
1580                 break;
1581         }
1582         if (badwparsn) {
1583                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
1584                     wh, NULL,
1585                     "%s", "missing WPA/RSN IE in association request");
1586                 vap->iv_stats.is_rx_assoc_badwpaie++;
1587                 reason = IEEE80211_REASON_IE_INVALID;
1588                 goto bad;
1589         }
1590         /*
1591          * Parse WPA/RSN information element.
1592          */
1593         if (wpa != NULL)
1594                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
1595         else
1596                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
1597         if (reason != 0) {
1598                 /* XXX wpa->rsn fallback? */
1599                 /* XXX distinguish WPA/RSN? */
1600                 vap->iv_stats.is_rx_assoc_badwpaie++;
1601                 goto bad;
1602         }
1603         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
1604             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
1605             wpa != NULL ? "WPA" : "RSN",
1606             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
1607             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
1608             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
1609
1610         return 1;
1611 bad:
1612         ieee80211_node_deauth(ni, reason);
1613         return 0;
1614 }
1615
1616 /* XXX find a better place for definition */
1617 struct l2_update_frame {
1618         struct ether_header eh;
1619         uint8_t dsap;
1620         uint8_t ssap;
1621         uint8_t control;
1622         uint8_t xid[3];
1623 }  __packed;
1624
1625 /*
1626  * Deliver a TGf L2UF frame on behalf of a station.
1627  * This primes any bridge when the station is roaming
1628  * between ap's on the same wired network.
1629  */
1630 static void
1631 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
1632 {
1633         struct ieee80211vap *vap = ni->ni_vap;
1634         struct ifnet *ifp = vap->iv_ifp;
1635         struct mbuf *m;
1636         struct l2_update_frame *l2uf;
1637         struct ether_header *eh;
1638
1639         m = m_gethdr(M_NOWAIT, MT_DATA);
1640         if (m == NULL) {
1641                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
1642                     "%s", "no mbuf for l2uf frame");
1643                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
1644                 return;
1645         }
1646         l2uf = mtod(m, struct l2_update_frame *);
1647         eh = &l2uf->eh;
1648         /* dst: Broadcast address */
1649         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
1650         /* src: associated STA */
1651         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
1652         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
1653
1654         l2uf->dsap = 0;
1655         l2uf->ssap = 0;
1656         l2uf->control = 0xf5;
1657         l2uf->xid[0] = 0x81;
1658         l2uf->xid[1] = 0x80;
1659         l2uf->xid[2] = 0x00;
1660
1661         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
1662         hostap_deliver_data(vap, ni, m);
1663 }
1664
1665 static void
1666 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1667         int reassoc, int resp, const char *tag, int rate)
1668 {
1669         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1670             "deny %s request, %s rate set mismatch, rate/MCS %d",
1671             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
1672         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
1673         ieee80211_node_leave(ni);
1674 }
1675
1676 static void
1677 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1678         int reassoc, int resp, const char *tag, int capinfo)
1679 {
1680         struct ieee80211vap *vap = ni->ni_vap;
1681
1682         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
1683             "deny %s request, %s mismatch 0x%x",
1684             reassoc ? "reassoc" : "assoc", tag, capinfo);
1685         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
1686         ieee80211_node_leave(ni);
1687         vap->iv_stats.is_rx_assoc_capmismatch++;
1688 }
1689
1690 static void
1691 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1692         int reassoc, int resp)
1693 {
1694         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
1695             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
1696         /* XXX no better code */
1697         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
1698         ieee80211_node_leave(ni);
1699 }
1700
1701 static void
1702 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
1703         int algo, int seq, int status)
1704 {
1705         struct ieee80211vap *vap = ni->ni_vap;
1706
1707         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1708             wh, NULL, "unsupported alg %d", algo);
1709         vap->iv_stats.is_rx_auth_unsupported++;
1710         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
1711             seq | (status << 16));
1712 }
1713
1714 static __inline int
1715 ishtmixed(const uint8_t *ie)
1716 {
1717         const struct ieee80211_ie_htinfo *ht =
1718             (const struct ieee80211_ie_htinfo *) ie;
1719         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
1720             IEEE80211_HTINFO_OPMODE_MIXED;
1721 }
1722
1723 static int
1724 is11bclient(const uint8_t *rates, const uint8_t *xrates)
1725 {
1726         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
1727         int i;
1728
1729         /* NB: the 11b clients we care about will not have xrates */
1730         if (xrates != NULL || rates == NULL)
1731                 return 0;
1732         for (i = 0; i < rates[1]; i++) {
1733                 int r = rates[2+i] & IEEE80211_RATE_VAL;
1734                 if (r > 2*11 || ((1<<r) & brates) == 0)
1735                         return 0;
1736         }
1737         return 1;
1738 }
1739
1740 static void
1741 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
1742         int subtype, const struct ieee80211_rx_stats *rxs, int rssi, int nf)
1743 {
1744         struct ieee80211vap *vap = ni->ni_vap;
1745         struct ieee80211com *ic = ni->ni_ic;
1746         struct ieee80211_frame *wh;
1747         uint8_t *frm, *efrm, *sfrm;
1748         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
1749         uint8_t *vhtcap, *vhtinfo;
1750         int reassoc, resp;
1751         uint8_t rate;
1752
1753         wh = mtod(m0, struct ieee80211_frame *);
1754         frm = (uint8_t *)&wh[1];
1755         efrm = mtod(m0, uint8_t *) + m0->m_len;
1756         switch (subtype) {
1757         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1758                 /*
1759                  * We process beacon/probe response frames when scanning;
1760                  * otherwise we check beacon frames for overlapping non-ERP
1761                  * BSS in 11g and/or overlapping legacy BSS when in HT.
1762                  */
1763                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1764                         vap->iv_stats.is_rx_mgtdiscard++;
1765                         return;
1766                 }
1767                 /* FALLTHROUGH */
1768         case IEEE80211_FC0_SUBTYPE_BEACON: {
1769                 struct ieee80211_scanparams scan;
1770
1771                 /* NB: accept off-channel frames */
1772                 /* XXX TODO: use rxstatus to determine off-channel details */
1773                 if (ieee80211_parse_beacon(ni, m0, ic->ic_curchan, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
1774                         return;
1775                 /*
1776                  * Count frame now that we know it's to be processed.
1777                  */
1778                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
1779                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
1780                         IEEE80211_NODE_STAT(ni, rx_beacons);
1781                 } else
1782                         IEEE80211_NODE_STAT(ni, rx_proberesp);
1783                 /*
1784                  * If scanning, just pass information to the scan module.
1785                  */
1786                 if (ic->ic_flags & IEEE80211_F_SCAN) {
1787                         if (scan.status == 0 &&         /* NB: on channel */
1788                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
1789                                 /*
1790                                  * Actively scanning a channel marked passive;
1791                                  * send a probe request now that we know there
1792                                  * is 802.11 traffic present.
1793                                  *
1794                                  * XXX check if the beacon we recv'd gives
1795                                  * us what we need and suppress the probe req
1796                                  */
1797                                 ieee80211_probe_curchan(vap, 1);
1798                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
1799                         }
1800                         ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
1801                             subtype, rssi, nf);
1802                         return;
1803                 }
1804                 /*
1805                  * Check beacon for overlapping bss w/ non ERP stations.
1806                  * If we detect one and protection is configured but not
1807                  * enabled, enable it and start a timer that'll bring us
1808                  * out if we stop seeing the bss.
1809                  */
1810                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1811                     scan.status == 0 &&                 /* NB: on-channel */
1812                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
1813                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
1814                         ic->ic_lastnonerp = ticks;
1815                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
1816                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
1817                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
1818                                 IEEE80211_NOTE_FRAME(vap,
1819                                     IEEE80211_MSG_ASSOC, wh,
1820                                     "non-ERP present on channel %d "
1821                                     "(saw erp 0x%x from channel %d), "
1822                                     "enable use of protection",
1823                                     ic->ic_curchan->ic_ieee,
1824                                     scan.erp, scan.chan);
1825                                 ic->ic_flags |= IEEE80211_F_USEPROT;
1826                                 ieee80211_notify_erp(ic);
1827                         }
1828                 }
1829                 /*
1830                  * Check beacon for non-HT station on HT channel
1831                  * and update HT BSS occupancy as appropriate.
1832                  */
1833                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
1834                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
1835                                 /*
1836                                  * Off control channel; only check frames
1837                                  * that come in the extension channel when
1838                                  * operating w/ HT40.
1839                                  */
1840                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
1841                                         break;
1842                                 if (scan.chan != ic->ic_curchan->ic_extieee)
1843                                         break;
1844                         }
1845                         if (scan.htinfo == NULL) {
1846                                 ieee80211_htprot_update(ic,
1847                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
1848                                     IEEE80211_HTINFO_NONHT_PRESENT);
1849                         } else if (ishtmixed(scan.htinfo)) {
1850                                 /* XXX? take NONHT_PRESENT from beacon? */
1851                                 ieee80211_htprot_update(ic,
1852                                     IEEE80211_HTINFO_OPMODE_MIXED |
1853                                     IEEE80211_HTINFO_NONHT_PRESENT);
1854                         }
1855                 }
1856                 break;
1857         }
1858
1859         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
1860                 if (vap->iv_state != IEEE80211_S_RUN) {
1861                         vap->iv_stats.is_rx_mgtdiscard++;
1862                         return;
1863                 }
1864                 /*
1865                  * Consult the ACL policy module if setup.
1866                  */
1867                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1868                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1869                             wh, NULL, "%s", "disallowed by ACL");
1870                         vap->iv_stats.is_rx_acl++;
1871                         return;
1872                 }
1873                 /*
1874                  * prreq frame format
1875                  *      [tlv] ssid
1876                  *      [tlv] supported rates
1877                  *      [tlv] extended supported rates
1878                  */
1879                 ssid = rates = xrates = NULL;
1880                 while (efrm - frm > 1) {
1881                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
1882                         switch (*frm) {
1883                         case IEEE80211_ELEMID_SSID:
1884                                 ssid = frm;
1885                                 break;
1886                         case IEEE80211_ELEMID_RATES:
1887                                 rates = frm;
1888                                 break;
1889                         case IEEE80211_ELEMID_XRATES:
1890                                 xrates = frm;
1891                                 break;
1892                         }
1893                         frm += frm[1] + 2;
1894                 }
1895                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
1896                 if (xrates != NULL)
1897                         IEEE80211_VERIFY_ELEMENT(xrates,
1898                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
1899                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
1900                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
1901                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
1902                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
1903                             wh, NULL,
1904                             "%s", "no ssid with ssid suppression enabled");
1905                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
1906                         return;
1907                 }
1908
1909                 /* XXX find a better class or define it's own */
1910                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
1911                     "%s", "recv probe req");
1912                 /*
1913                  * Some legacy 11b clients cannot hack a complete
1914                  * probe response frame.  When the request includes
1915                  * only a bare-bones rate set, communicate this to
1916                  * the transmit side.
1917                  */
1918                 ieee80211_send_proberesp(vap, wh->i_addr2,
1919                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
1920                 break;
1921
1922         case IEEE80211_FC0_SUBTYPE_AUTH: {
1923                 uint16_t algo, seq, status;
1924
1925                 if (vap->iv_state != IEEE80211_S_RUN) {
1926                         vap->iv_stats.is_rx_mgtdiscard++;
1927                         return;
1928                 }
1929                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
1930                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
1931                             wh, NULL, "%s", "wrong bssid");
1932                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
1933                         return;
1934                 }
1935                 /*
1936                  * auth frame format
1937                  *      [2] algorithm
1938                  *      [2] sequence
1939                  *      [2] status
1940                  *      [tlv*] challenge
1941                  */
1942                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
1943                 algo   = le16toh(*(uint16_t *)frm);
1944                 seq    = le16toh(*(uint16_t *)(frm + 2));
1945                 status = le16toh(*(uint16_t *)(frm + 4));
1946                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
1947                     "recv auth frame with algorithm %d seq %d", algo, seq);
1948                 /*
1949                  * Consult the ACL policy module if setup.
1950                  */
1951                 if (vap->iv_acl != NULL && !vap->iv_acl->iac_check(vap, wh)) {
1952                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
1953                             wh, NULL, "%s", "disallowed by ACL");
1954                         vap->iv_stats.is_rx_acl++;
1955                         ieee80211_send_error(ni, wh->i_addr2,
1956                             IEEE80211_FC0_SUBTYPE_AUTH,
1957                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
1958                         return;
1959                 }
1960                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
1961                         IEEE80211_DISCARD(vap,
1962                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
1963                             wh, NULL, "%s", "TKIP countermeasures enabled");
1964                         vap->iv_stats.is_rx_auth_countermeasures++;
1965                         ieee80211_send_error(ni, wh->i_addr2,
1966                                 IEEE80211_FC0_SUBTYPE_AUTH,
1967                                 IEEE80211_REASON_MIC_FAILURE);
1968                         return;
1969                 }
1970                 if (algo == IEEE80211_AUTH_ALG_SHARED)
1971                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
1972                             seq, status);
1973                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
1974                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
1975                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
1976                         authalgreject(ni, wh, algo,
1977                             seq+1, IEEE80211_STATUS_ALG);
1978                         return;
1979                 } else {
1980                         /*
1981                          * We assume that an unknown algorithm is the result
1982                          * of a decryption failure on a shared key auth frame;
1983                          * return a status code appropriate for that instead
1984                          * of IEEE80211_STATUS_ALG.
1985                          *
1986                          * NB: a seq# of 4 is intentional; the decrypted
1987                          *     frame likely has a bogus seq value.
1988                          */
1989                         authalgreject(ni, wh, algo,
1990                             4, IEEE80211_STATUS_CHALLENGE);
1991                         return;
1992                 }
1993                 break;
1994         }
1995
1996         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1997         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
1998                 uint16_t capinfo, lintval;
1999                 struct ieee80211_rsnparms rsnparms;
2000
2001                 if (vap->iv_state != IEEE80211_S_RUN) {
2002                         vap->iv_stats.is_rx_mgtdiscard++;
2003                         return;
2004                 }
2005                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
2006                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2007                             wh, NULL, "%s", "wrong bssid");
2008                         vap->iv_stats.is_rx_assoc_bss++;
2009                         return;
2010                 }
2011                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2012                         reassoc = 1;
2013                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
2014                 } else {
2015                         reassoc = 0;
2016                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
2017                 }
2018                 if (ni == vap->iv_bss) {
2019                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
2020                             "deny %s request, sta not authenticated",
2021                             reassoc ? "reassoc" : "assoc");
2022                         ieee80211_send_error(ni, wh->i_addr2,
2023                             IEEE80211_FC0_SUBTYPE_DEAUTH,
2024                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
2025                         vap->iv_stats.is_rx_assoc_notauth++;
2026                         return;
2027                 }
2028
2029                 /*
2030                  * asreq frame format
2031                  *      [2] capability information
2032                  *      [2] listen interval
2033                  *      [6*] current AP address (reassoc only)
2034                  *      [tlv] ssid
2035                  *      [tlv] supported rates
2036                  *      [tlv] extended supported rates
2037                  *      [tlv] WPA or RSN
2038                  *      [tlv] HT capabilities
2039                  *      [tlv] Atheros capabilities
2040                  */
2041                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
2042                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
2043                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
2044                 if (reassoc)
2045                         frm += 6;       /* ignore current AP info */
2046                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
2047                 vhtcap = vhtinfo = NULL;
2048                 sfrm = frm;
2049                 while (efrm - frm > 1) {
2050                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
2051                         switch (*frm) {
2052                         case IEEE80211_ELEMID_SSID:
2053                                 ssid = frm;
2054                                 break;
2055                         case IEEE80211_ELEMID_RATES:
2056                                 rates = frm;
2057                                 break;
2058                         case IEEE80211_ELEMID_XRATES:
2059                                 xrates = frm;
2060                                 break;
2061                         case IEEE80211_ELEMID_RSN:
2062                                 rsn = frm;
2063                                 break;
2064                         case IEEE80211_ELEMID_HTCAP:
2065                                 htcap = frm;
2066                                 break;
2067                         case IEEE80211_ELEMID_VHT_CAP:
2068                                 vhtcap = frm;
2069                                 break;
2070                         case IEEE80211_ELEMID_VHT_OPMODE:
2071                                 vhtinfo = frm;
2072                                 break;
2073                         case IEEE80211_ELEMID_VENDOR:
2074                                 if (iswpaoui(frm))
2075                                         wpa = frm;
2076                                 else if (iswmeinfo(frm))
2077                                         wme = frm;
2078 #ifdef IEEE80211_SUPPORT_SUPERG
2079                                 else if (isatherosoui(frm))
2080                                         ath = frm;
2081 #endif
2082                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
2083                                         if (ishtcapoui(frm) && htcap == NULL)
2084                                                 htcap = frm;
2085                                 }
2086                                 break;
2087                         }
2088                         frm += frm[1] + 2;
2089                 }
2090                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
2091                 if (xrates != NULL)
2092                         IEEE80211_VERIFY_ELEMENT(xrates,
2093                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
2094                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
2095                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
2096                 if (htcap != NULL) {
2097                         IEEE80211_VERIFY_LENGTH(htcap[1],
2098                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
2099                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
2100                                  sizeof(struct ieee80211_ie_htcap)-2,
2101                              return);           /* XXX just NULL out? */
2102                 }
2103
2104                 /* Validate VHT IEs */
2105                 if (vhtcap != NULL) {
2106                         IEEE80211_VERIFY_LENGTH(vhtcap[1],
2107                             sizeof(struct ieee80211_ie_vhtcap) - 2,
2108                             return);
2109                 }
2110                 if (vhtinfo != NULL) {
2111                         IEEE80211_VERIFY_LENGTH(vhtinfo[1],
2112                             sizeof(struct ieee80211_ie_vht_operation) - 2,
2113                             return);
2114                 }
2115
2116                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
2117                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
2118                         return;
2119                 /* discard challenge after association */
2120                 if (ni->ni_challenge != NULL) {
2121                         IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
2122                         ni->ni_challenge = NULL;
2123                 }
2124                 /* NB: 802.11 spec says to ignore station's privacy bit */
2125                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
2126                         capinfomismatch(ni, wh, reassoc, resp,
2127                             "capability", capinfo);
2128                         return;
2129                 }
2130                 /*
2131                  * Disallow re-associate w/ invalid slot time setting.
2132                  */
2133                 if (ni->ni_associd != 0 &&
2134                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
2135                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
2136                         capinfomismatch(ni, wh, reassoc, resp,
2137                             "slot time", capinfo);
2138                         return;
2139                 }
2140                 rate = ieee80211_setup_rates(ni, rates, xrates,
2141                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
2142                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
2143                 if (rate & IEEE80211_RATE_BASIC) {
2144                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
2145                         vap->iv_stats.is_rx_assoc_norate++;
2146                         return;
2147                 }
2148                 /*
2149                  * If constrained to 11g-only stations reject an
2150                  * 11b-only station.  We cheat a bit here by looking
2151                  * at the max negotiated xmit rate and assuming anyone
2152                  * with a best rate <24Mb/s is an 11b station.
2153                  */
2154                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
2155                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
2156                         vap->iv_stats.is_rx_assoc_norate++;
2157                         return;
2158                 }
2159
2160                 /*
2161                  * Do HT rate set handling and setup HT node state.
2162                  */
2163                 ni->ni_chan = vap->iv_bss->ni_chan;
2164
2165                 /* VHT */
2166                 if (IEEE80211_IS_CHAN_VHT(ni->ni_chan) &&
2167                     vhtcap != NULL &&
2168                     vhtinfo != NULL) {
2169                         /* XXX TODO; see below */
2170                         printf("%s: VHT TODO!\n", __func__);
2171                         ieee80211_vht_node_init(ni);
2172                         ieee80211_vht_update_cap(ni, vhtcap, vhtinfo);
2173                 } else if (ni->ni_flags & IEEE80211_NODE_VHT)
2174                         ieee80211_vht_node_cleanup(ni);
2175
2176                 /* HT */
2177                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2178                         rate = ieee80211_setup_htrates(ni, htcap,
2179                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
2180                                 IEEE80211_F_DOBRS);
2181                         if (rate & IEEE80211_RATE_BASIC) {
2182                                 ratesetmismatch(ni, wh, reassoc, resp,
2183                                     "HT", rate);
2184                                 vap->iv_stats.is_ht_assoc_norate++;
2185                                 return;
2186                         }
2187                         ieee80211_ht_node_init(ni);
2188                         ieee80211_ht_updatehtcap(ni, htcap);
2189                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
2190                         ieee80211_ht_node_cleanup(ni);
2191
2192                 /* Finally - this will use HT/VHT info to change node channel */
2193                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
2194                         ieee80211_ht_updatehtcap_final(ni);
2195                 }
2196
2197 #ifdef IEEE80211_SUPPORT_SUPERG
2198                 /* Always do ff node cleanup; for A-MSDU */
2199                 ieee80211_ff_node_cleanup(ni);
2200 #endif
2201                 /*
2202                  * Allow AMPDU operation only with unencrypted traffic
2203                  * or AES-CCM; the 11n spec only specifies these ciphers
2204                  * so permitting any others is undefined and can lead
2205                  * to interoperability problems.
2206                  */
2207                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
2208                     (((vap->iv_flags & IEEE80211_F_WPA) &&
2209                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
2210                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
2211                         IEEE80211_NOTE(vap,
2212                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
2213                             "disallow HT use because WEP or TKIP requested, "
2214                             "capinfo 0x%x ucastcipher %d", capinfo,
2215                             rsnparms.rsn_ucastcipher);
2216                         ieee80211_ht_node_cleanup(ni);
2217 #ifdef IEEE80211_SUPPORT_SUPERG
2218                         /* Always do ff node cleanup; for A-MSDU */
2219                         ieee80211_ff_node_cleanup(ni);
2220 #endif
2221                         vap->iv_stats.is_ht_assoc_downgrade++;
2222                 }
2223                 /*
2224                  * If constrained to 11n-only stations reject legacy stations.
2225                  */
2226                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
2227                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
2228                         htcapmismatch(ni, wh, reassoc, resp);
2229                         vap->iv_stats.is_ht_assoc_nohtcap++;
2230                         return;
2231                 }
2232                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
2233                 ni->ni_noise = nf;
2234                 ni->ni_intval = lintval;
2235                 ni->ni_capinfo = capinfo;
2236                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
2237                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
2238                 /*
2239                  * Store the IEs.
2240                  * XXX maybe better to just expand
2241                  */
2242                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
2243 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
2244                         if (wpa != NULL)
2245                                 setie(wpa_ie, wpa - sfrm);
2246                         if (rsn != NULL)
2247                                 setie(rsn_ie, rsn - sfrm);
2248                         if (htcap != NULL)
2249                                 setie(htcap_ie, htcap - sfrm);
2250                         if (wme != NULL) {
2251                                 setie(wme_ie, wme - sfrm);
2252                                 /*
2253                                  * Mark node as capable of QoS.
2254                                  */
2255                                 ni->ni_flags |= IEEE80211_NODE_QOS;
2256                         } else
2257                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
2258 #ifdef IEEE80211_SUPPORT_SUPERG
2259                         if (ath != NULL) {
2260                                 setie(ath_ie, ath - sfrm);
2261                                 /*
2262                                  * Parse ATH station parameters.
2263                                  */
2264                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
2265                         } else
2266 #endif
2267                                 ni->ni_ath_flags = 0;
2268 #undef setie
2269                 } else {
2270                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
2271                         ni->ni_ath_flags = 0;
2272                 }
2273                 ieee80211_node_join(ni, resp);
2274                 ieee80211_deliver_l2uf(ni);
2275                 break;
2276         }
2277
2278         case IEEE80211_FC0_SUBTYPE_DEAUTH:
2279         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
2280                 uint16_t reason;
2281
2282                 if (vap->iv_state != IEEE80211_S_RUN ||
2283                     /* NB: can happen when in promiscuous mode */
2284                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
2285                         vap->iv_stats.is_rx_mgtdiscard++;
2286                         break;
2287                 }
2288                 /*
2289                  * deauth/disassoc frame format
2290                  *      [2] reason
2291                  */
2292                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
2293                 reason = le16toh(*(uint16_t *)frm);
2294                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
2295                         vap->iv_stats.is_rx_deauth++;
2296                         IEEE80211_NODE_STAT(ni, rx_deauth);
2297                 } else {
2298                         vap->iv_stats.is_rx_disassoc++;
2299                         IEEE80211_NODE_STAT(ni, rx_disassoc);
2300                 }
2301                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2302                     "recv %s (reason: %d (%s))",
2303                     ieee80211_mgt_subtype_name(subtype),
2304                     reason, ieee80211_reason_to_string(reason));
2305                 if (ni != vap->iv_bss)
2306                         ieee80211_node_leave(ni);
2307                 break;
2308         }
2309
2310         case IEEE80211_FC0_SUBTYPE_ACTION:
2311         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
2312                 if (ni == vap->iv_bss) {
2313                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2314                             wh, NULL, "%s", "unknown node");
2315                         vap->iv_stats.is_rx_mgtdiscard++;
2316                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
2317                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
2318                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2319                             wh, NULL, "%s", "not for us");
2320                         vap->iv_stats.is_rx_mgtdiscard++;
2321                 } else if (vap->iv_state != IEEE80211_S_RUN) {
2322                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2323                             wh, NULL, "wrong state %s",
2324                             ieee80211_state_name[vap->iv_state]);
2325                         vap->iv_stats.is_rx_mgtdiscard++;
2326                 } else {
2327                         if (ieee80211_parse_action(ni, m0) == 0)
2328                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
2329                 }
2330                 break;
2331
2332         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2333         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2334         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
2335         case IEEE80211_FC0_SUBTYPE_ATIM:
2336                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
2337                     wh, NULL, "%s", "not handled");
2338                 vap->iv_stats.is_rx_mgtdiscard++;
2339                 break;
2340
2341         default:
2342                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
2343                     wh, "mgt", "subtype 0x%x not handled", subtype);
2344                 vap->iv_stats.is_rx_badsubtype++;
2345                 break;
2346         }
2347 }
2348
2349 static void
2350 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
2351 {
2352         switch (subtype) {
2353         case IEEE80211_FC0_SUBTYPE_PS_POLL:
2354                 ni->ni_vap->iv_recv_pspoll(ni, m);
2355                 break;
2356         case IEEE80211_FC0_SUBTYPE_BAR:
2357                 ieee80211_recv_bar(ni, m);
2358                 break;
2359         }
2360 }
2361
2362 /*
2363  * Process a received ps-poll frame.
2364  */
2365 void
2366 ieee80211_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
2367 {
2368         struct ieee80211vap *vap = ni->ni_vap;
2369         struct ieee80211com *ic = vap->iv_ic;
2370         struct ieee80211_frame_min *wh;
2371         struct mbuf *m;
2372         uint16_t aid;
2373         int qlen;
2374
2375         wh = mtod(m0, struct ieee80211_frame_min *);
2376         if (ni->ni_associd == 0) {
2377                 IEEE80211_DISCARD(vap,
2378                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2379                     (struct ieee80211_frame *) wh, NULL,
2380                     "%s", "unassociated station");
2381                 vap->iv_stats.is_ps_unassoc++;
2382                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
2383                         IEEE80211_REASON_NOT_ASSOCED);
2384                 return;
2385         }
2386
2387         aid = le16toh(*(uint16_t *)wh->i_dur);
2388         if (aid != ni->ni_associd) {
2389                 IEEE80211_DISCARD(vap,
2390                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
2391                     (struct ieee80211_frame *) wh, NULL,
2392                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
2393                     ni->ni_associd, aid);
2394                 vap->iv_stats.is_ps_badaid++;
2395                 /*
2396                  * NB: We used to deauth the station but it turns out
2397                  * the Blackberry Curve 8230 (and perhaps other devices)
2398                  * sometimes send the wrong AID when WME is negotiated.
2399                  * Being more lenient here seems ok as we already check
2400                  * the station is associated and we only return frames
2401                  * queued for the station (i.e. we don't use the AID).
2402                  */
2403                 return;
2404         }
2405
2406         /* Okay, take the first queued packet and put it out... */
2407         m = ieee80211_node_psq_dequeue(ni, &qlen);
2408         if (m == NULL) {
2409                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
2410                     "%s", "recv ps-poll, but queue empty");
2411                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
2412                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
2413                 if (vap->iv_set_tim != NULL)
2414                         vap->iv_set_tim(ni, 0); /* just in case */
2415                 return;
2416         }
2417         /*
2418          * If there are more packets, set the more packets bit
2419          * in the packet dispatched to the station; otherwise
2420          * turn off the TIM bit.
2421          */
2422         if (qlen != 0) {
2423                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2424                     "recv ps-poll, send packet, %u still queued", qlen);
2425                 m->m_flags |= M_MORE_DATA;
2426         } else {
2427                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
2428                     "%s", "recv ps-poll, send packet, queue empty");
2429                 if (vap->iv_set_tim != NULL)
2430                         vap->iv_set_tim(ni, 0);
2431         }
2432         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
2433
2434         /*
2435          * Do the right thing; if it's an encap'ed frame then
2436          * call ieee80211_parent_xmitpkt() else
2437          * call ieee80211_vap_xmitpkt().
2438          */
2439         if (m->m_flags & M_ENCAP) {
2440                 (void) ieee80211_parent_xmitpkt(ic, m);
2441         } else {
2442                 (void) ieee80211_vap_xmitpkt(vap, m);
2443         }
2444 }