The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_hostap.c

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    1 /*-
    2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 #ifdef __FreeBSD__
   28 __FBSDID("$FreeBSD: releng/9.0/sys/net80211/ieee80211_hostap.c 221418 2011-05-04 02:23:59Z adrian $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11 HOSTAP mode support.
   33  */
   34 #include "opt_inet.h"
   35 #include "opt_wlan.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h> 
   39 #include <sys/mbuf.h>   
   40 #include <sys/malloc.h>
   41 #include <sys/kernel.h>
   42 
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/endian.h>
   46 #include <sys/errno.h>
   47 #include <sys/proc.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_media.h>
   52 #include <net/if_llc.h>
   53 #include <net/ethernet.h>
   54 
   55 #include <net/bpf.h>
   56 
   57 #include <net80211/ieee80211_var.h>
   58 #include <net80211/ieee80211_hostap.h>
   59 #include <net80211/ieee80211_input.h>
   60 #ifdef IEEE80211_SUPPORT_SUPERG
   61 #include <net80211/ieee80211_superg.h>
   62 #endif
   63 #include <net80211/ieee80211_wds.h>
   64 
   65 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
   66 
   67 static  void hostap_vattach(struct ieee80211vap *);
   68 static  int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   69 static  int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
   70             int rssi, int nf);
   71 static void hostap_deliver_data(struct ieee80211vap *,
   72             struct ieee80211_node *, struct mbuf *);
   73 static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   74             int subtype, int rssi, int nf);
   75 static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
   76 static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
   77 
   78 void
   79 ieee80211_hostap_attach(struct ieee80211com *ic)
   80 {
   81         ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
   82 }
   83 
   84 void
   85 ieee80211_hostap_detach(struct ieee80211com *ic)
   86 {
   87 }
   88 
   89 static void
   90 hostap_vdetach(struct ieee80211vap *vap)
   91 {
   92 }
   93 
   94 static void
   95 hostap_vattach(struct ieee80211vap *vap)
   96 {
   97         vap->iv_newstate = hostap_newstate;
   98         vap->iv_input = hostap_input;
   99         vap->iv_recv_mgmt = hostap_recv_mgmt;
  100         vap->iv_recv_ctl = hostap_recv_ctl;
  101         vap->iv_opdetach = hostap_vdetach;
  102         vap->iv_deliver_data = hostap_deliver_data;
  103 }
  104 
  105 static void
  106 sta_disassoc(void *arg, struct ieee80211_node *ni)
  107 {
  108         struct ieee80211vap *vap = arg;
  109 
  110         if (ni->ni_vap == vap && ni->ni_associd != 0) {
  111                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
  112                         IEEE80211_REASON_ASSOC_LEAVE);
  113                 ieee80211_node_leave(ni);
  114         }
  115 }
  116 
  117 static void
  118 sta_csa(void *arg, struct ieee80211_node *ni)
  119 {
  120         struct ieee80211vap *vap = arg;
  121 
  122         if (ni->ni_vap == vap && ni->ni_associd != 0)
  123                 if (ni->ni_inact > vap->iv_inact_init) {
  124                         ni->ni_inact = vap->iv_inact_init;
  125                         IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
  126                             "%s: inact %u", __func__, ni->ni_inact);
  127                 }
  128 }
  129 
  130 static void
  131 sta_drop(void *arg, struct ieee80211_node *ni)
  132 {
  133         struct ieee80211vap *vap = arg;
  134 
  135         if (ni->ni_vap == vap && ni->ni_associd != 0)
  136                 ieee80211_node_leave(ni);
  137 }
  138 
  139 /*
  140  * Does a channel change require associated stations to re-associate
  141  * so protocol state is correct.  This is used when doing CSA across
  142  * bands or similar (e.g. HT -> legacy).
  143  */
  144 static int
  145 isbandchange(struct ieee80211com *ic)
  146 {
  147         return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
  148             (IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
  149              IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
  150 }
  151 
  152 /*
  153  * IEEE80211_M_HOSTAP vap state machine handler.
  154  */
  155 static int
  156 hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  157 {
  158         struct ieee80211com *ic = vap->iv_ic;
  159         enum ieee80211_state ostate;
  160 
  161         IEEE80211_LOCK_ASSERT(ic);
  162 
  163         ostate = vap->iv_state;
  164         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  165             __func__, ieee80211_state_name[ostate],
  166             ieee80211_state_name[nstate], arg);
  167         vap->iv_state = nstate;                 /* state transition */
  168         if (ostate != IEEE80211_S_SCAN)
  169                 ieee80211_cancel_scan(vap);     /* background scan */
  170         switch (nstate) {
  171         case IEEE80211_S_INIT:
  172                 switch (ostate) {
  173                 case IEEE80211_S_SCAN:
  174                         ieee80211_cancel_scan(vap);
  175                         break;
  176                 case IEEE80211_S_CAC:
  177                         ieee80211_dfs_cac_stop(vap);
  178                         break;
  179                 case IEEE80211_S_RUN:
  180                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
  181                         break;
  182                 default:
  183                         break;
  184                 }
  185                 if (ostate != IEEE80211_S_INIT) {
  186                         /* NB: optimize INIT -> INIT case */
  187                         ieee80211_reset_bss(vap);
  188                 }
  189                 if (vap->iv_auth->ia_detach != NULL)
  190                         vap->iv_auth->ia_detach(vap);
  191                 break;
  192         case IEEE80211_S_SCAN:
  193                 switch (ostate) {
  194                 case IEEE80211_S_CSA:
  195                 case IEEE80211_S_RUN:
  196                         ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
  197                         /*
  198                          * Clear overlapping BSS state; the beacon frame
  199                          * will be reconstructed on transition to the RUN
  200                          * state and the timeout routines check if the flag
  201                          * is set before doing anything so this is sufficient.
  202                          */
  203                         ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
  204                         ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
  205                         /* fall thru... */
  206                 case IEEE80211_S_CAC:
  207                         /*
  208                          * NB: We may get here because of a manual channel
  209                          *     change in which case we need to stop CAC
  210                          * XXX no need to stop if ostate RUN but it's ok
  211                          */
  212                         ieee80211_dfs_cac_stop(vap);
  213                         /* fall thru... */
  214                 case IEEE80211_S_INIT:
  215                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
  216                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
  217                                 /*
  218                                  * Already have a channel; bypass the
  219                                  * scan and startup immediately.  
  220                                  * ieee80211_create_ibss will call back to
  221                                  * move us to RUN state.
  222                                  */
  223                                 ieee80211_create_ibss(vap, vap->iv_des_chan);
  224                                 break;
  225                         }
  226                         /*
  227                          * Initiate a scan.  We can come here as a result
  228                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  229                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  230                          * and the scan request parameters will be present
  231                          * in iv_scanreq.  Otherwise we do the default.
  232                          */
  233                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  234                                 ieee80211_check_scan(vap,
  235                                     vap->iv_scanreq_flags,
  236                                     vap->iv_scanreq_duration,
  237                                     vap->iv_scanreq_mindwell,
  238                                     vap->iv_scanreq_maxdwell,
  239                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  240                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  241                         } else
  242                                 ieee80211_check_scan_current(vap);
  243                         break;
  244                 case IEEE80211_S_SCAN:
  245                         /*
  246                          * A state change requires a reset; scan.
  247                          */
  248                         ieee80211_check_scan_current(vap);
  249                         break;
  250                 default:
  251                         break;
  252                 }
  253                 break;
  254         case IEEE80211_S_CAC:
  255                 /*
  256                  * Start CAC on a DFS channel.  We come here when starting
  257                  * a bss on a DFS channel (see ieee80211_create_ibss).
  258                  */
  259                 ieee80211_dfs_cac_start(vap);
  260                 break;
  261         case IEEE80211_S_RUN:
  262                 if (vap->iv_flags & IEEE80211_F_WPA) {
  263                         /* XXX validate prerequisites */
  264                 }
  265                 switch (ostate) {
  266                 case IEEE80211_S_INIT:
  267                         /*
  268                          * Already have a channel; bypass the
  269                          * scan and startup immediately.
  270                          * Note that ieee80211_create_ibss will call
  271                          * back to do a RUN->RUN state change.
  272                          */
  273                         ieee80211_create_ibss(vap,
  274                             ieee80211_ht_adjust_channel(ic,
  275                                 ic->ic_curchan, vap->iv_flags_ht));
  276                         /* NB: iv_bss is changed on return */
  277                         break;
  278                 case IEEE80211_S_CAC:
  279                         /*
  280                          * NB: This is the normal state change when CAC
  281                          * expires and no radar was detected; no need to
  282                          * clear the CAC timer as it's already expired.
  283                          */
  284                         /* fall thru... */
  285                 case IEEE80211_S_CSA:
  286                         /*
  287                          * Shorten inactivity timer of associated stations
  288                          * to weed out sta's that don't follow a CSA.
  289                          */
  290                         ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
  291                         /*
  292                          * Update bss node channel to reflect where
  293                          * we landed after CSA.
  294                          */
  295                         ieee80211_node_set_chan(vap->iv_bss,
  296                             ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
  297                                 ieee80211_htchanflags(vap->iv_bss->ni_chan)));
  298                         /* XXX bypass debug msgs */
  299                         break;
  300                 case IEEE80211_S_SCAN:
  301                 case IEEE80211_S_RUN:
  302 #ifdef IEEE80211_DEBUG
  303                         if (ieee80211_msg_debug(vap)) {
  304                                 struct ieee80211_node *ni = vap->iv_bss;
  305                                 ieee80211_note(vap,
  306                                     "synchronized with %s ssid ",
  307                                     ether_sprintf(ni->ni_bssid));
  308                                 ieee80211_print_essid(ni->ni_essid,
  309                                     ni->ni_esslen);
  310                                 /* XXX MCS/HT */
  311                                 printf(" channel %d start %uMb\n",
  312                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
  313                                     IEEE80211_RATE2MBS(ni->ni_txrate));
  314                         }
  315 #endif
  316                         break;
  317                 default:
  318                         break;
  319                 }
  320                 /*
  321                  * Start/stop the authenticator.  We delay until here
  322                  * to allow configuration to happen out of order.
  323                  */
  324                 if (vap->iv_auth->ia_attach != NULL) {
  325                         /* XXX check failure */
  326                         vap->iv_auth->ia_attach(vap);
  327                 } else if (vap->iv_auth->ia_detach != NULL) {
  328                         vap->iv_auth->ia_detach(vap);
  329                 }
  330                 ieee80211_node_authorize(vap->iv_bss);
  331                 break;
  332         case IEEE80211_S_CSA:
  333                 if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
  334                         /*
  335                          * On a ``band change'' silently drop associated
  336                          * stations as they must re-associate before they
  337                          * can pass traffic (as otherwise protocol state
  338                          * such as capabilities and the negotiated rate
  339                          * set may/will be wrong).
  340                          */
  341                         ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
  342                 }
  343                 break;
  344         default:
  345                 break;
  346         }
  347         return 0;
  348 }
  349 
  350 static void
  351 hostap_deliver_data(struct ieee80211vap *vap,
  352         struct ieee80211_node *ni, struct mbuf *m)
  353 {
  354         struct ether_header *eh = mtod(m, struct ether_header *);
  355         struct ifnet *ifp = vap->iv_ifp;
  356 
  357         /* clear driver/net80211 flags before passing up */
  358         m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
  359 
  360         KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
  361             ("gack, opmode %d", vap->iv_opmode));
  362         /*
  363          * Do accounting.
  364          */
  365         ifp->if_ipackets++;
  366         IEEE80211_NODE_STAT(ni, rx_data);
  367         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
  368         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  369                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
  370                 IEEE80211_NODE_STAT(ni, rx_mcast);
  371         } else
  372                 IEEE80211_NODE_STAT(ni, rx_ucast);
  373 
  374         /* perform as a bridge within the AP */
  375         if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
  376                 struct mbuf *mcopy = NULL;
  377 
  378                 if (m->m_flags & M_MCAST) {
  379                         mcopy = m_dup(m, M_DONTWAIT);
  380                         if (mcopy == NULL)
  381                                 ifp->if_oerrors++;
  382                         else
  383                                 mcopy->m_flags |= M_MCAST;
  384                 } else {
  385                         /*
  386                          * Check if the destination is associated with the
  387                          * same vap and authorized to receive traffic.
  388                          * Beware of traffic destined for the vap itself;
  389                          * sending it will not work; just let it be delivered
  390                          * normally.
  391                          */
  392                         struct ieee80211_node *sta = ieee80211_find_vap_node(
  393                              &vap->iv_ic->ic_sta, vap, eh->ether_dhost);
  394                         if (sta != NULL) {
  395                                 if (ieee80211_node_is_authorized(sta)) {
  396                                         /*
  397                                          * Beware of sending to ourself; this
  398                                          * needs to happen via the normal
  399                                          * input path.
  400                                          */
  401                                         if (sta != vap->iv_bss) {
  402                                                 mcopy = m;
  403                                                 m = NULL;
  404                                         }
  405                                 } else {
  406                                         vap->iv_stats.is_rx_unauth++;
  407                                         IEEE80211_NODE_STAT(sta, rx_unauth);
  408                                 }
  409                                 ieee80211_free_node(sta);
  410                         }
  411                 }
  412                 if (mcopy != NULL) {
  413                         int len, err;
  414                         len = mcopy->m_pkthdr.len;
  415                         err = ifp->if_transmit(ifp, mcopy);
  416                         if (err) {
  417                                 /* NB: IFQ_HANDOFF reclaims mcopy */
  418                         } else {
  419                                 ifp->if_opackets++;
  420                         }
  421                 }
  422         }
  423         if (m != NULL) {
  424                 /*
  425                  * Mark frame as coming from vap's interface.
  426                  */
  427                 m->m_pkthdr.rcvif = ifp;
  428                 if (m->m_flags & M_MCAST) {
  429                         /*
  430                          * Spam DWDS vap's w/ multicast traffic.
  431                          */
  432                         /* XXX only if dwds in use? */
  433                         ieee80211_dwds_mcast(vap, m);
  434                 }
  435                 if (ni->ni_vlan != 0) {
  436                         /* attach vlan tag */
  437                         m->m_pkthdr.ether_vtag = ni->ni_vlan;
  438                         m->m_flags |= M_VLANTAG;
  439                 }
  440                 ifp->if_input(ifp, m);
  441         }
  442 }
  443 
  444 /*
  445  * Decide if a received management frame should be
  446  * printed when debugging is enabled.  This filters some
  447  * of the less interesting frames that come frequently
  448  * (e.g. beacons).
  449  */
  450 static __inline int
  451 doprint(struct ieee80211vap *vap, int subtype)
  452 {
  453         switch (subtype) {
  454         case IEEE80211_FC0_SUBTYPE_BEACON:
  455                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
  456         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  457                 return 0;
  458         }
  459         return 1;
  460 }
  461 
  462 /*
  463  * Process a received frame.  The node associated with the sender
  464  * should be supplied.  If nothing was found in the node table then
  465  * the caller is assumed to supply a reference to iv_bss instead.
  466  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  467  * during AP scanning to select a AP to associate with; it can have
  468  * any units so long as values have consistent units and higher values
  469  * mean ``better signal''.  The receive timestamp is currently not used
  470  * by the 802.11 layer.
  471  */
  472 static int
  473 hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  474 {
  475 #define HAS_SEQ(type)   ((type & 0x4) == 0)
  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         uint16_t rxseq;
  486 
  487         if (m->m_flags & M_AMPDU_MPDU) {
  488                 /*
  489                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  490                  * w/ M_AMPDU_MPDU marked have already passed through
  491                  * here but were received out of order and been held on
  492                  * the reorder queue.  When resubmitted they are marked
  493                  * with the M_AMPDU_MPDU flag and we can bypass most of
  494                  * the normal processing.
  495                  */
  496                 wh = mtod(m, struct ieee80211_frame *);
  497                 type = IEEE80211_FC0_TYPE_DATA;
  498                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  499                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  500                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  501                 goto resubmit_ampdu;
  502         }
  503 
  504         KASSERT(ni != NULL, ("null node"));
  505         ni->ni_inact = ni->ni_inact_reload;
  506 
  507         type = -1;                      /* undefined */
  508 
  509         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  510                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  511                     ni->ni_macaddr, NULL,
  512                     "too short (1): len %u", m->m_pkthdr.len);
  513                 vap->iv_stats.is_rx_tooshort++;
  514                 goto out;
  515         }
  516         /*
  517          * Bit of a cheat here, we use a pointer for a 3-address
  518          * frame format but don't reference fields past outside
  519          * ieee80211_frame_min w/o first validating the data is
  520          * present.
  521          */
  522         wh = mtod(m, struct ieee80211_frame *);
  523 
  524         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  525             IEEE80211_FC0_VERSION_0) {
  526                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  527                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  528                     wh->i_fc[0], wh->i_fc[1]);
  529                 vap->iv_stats.is_rx_badversion++;
  530                 goto err;
  531         }
  532 
  533         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  534         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  535         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  536         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
  537                 if (dir != IEEE80211_FC1_DIR_NODS)
  538                         bssid = wh->i_addr1;
  539                 else if (type == IEEE80211_FC0_TYPE_CTL)
  540                         bssid = wh->i_addr1;
  541                 else {
  542                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  543                                 IEEE80211_DISCARD_MAC(vap,
  544                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
  545                                     NULL, "too short (2): len %u",
  546                                     m->m_pkthdr.len);
  547                                 vap->iv_stats.is_rx_tooshort++;
  548                                 goto out;
  549                         }
  550                         bssid = wh->i_addr3;
  551                 }
  552                 /*
  553                  * Validate the bssid.
  554                  */
  555                 if (!(type == IEEE80211_FC0_TYPE_MGT &&
  556                       subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
  557                     !IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
  558                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
  559                         /* not interested in */
  560                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  561                             bssid, NULL, "%s", "not to bss");
  562                         vap->iv_stats.is_rx_wrongbss++;
  563                         goto out;
  564                 }
  565 
  566                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  567                 ni->ni_noise = nf;
  568                 if (HAS_SEQ(type)) {
  569                         uint8_t tid = ieee80211_gettid(wh);
  570                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
  571                             TID_TO_WME_AC(tid) >= WME_AC_VI)
  572                                 ic->ic_wme.wme_hipri_traffic++;
  573                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  574                         if (! ieee80211_check_rxseq(ni, wh)) {
  575                                 /* duplicate, discard */
  576                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  577                                     bssid, "duplicate",
  578                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
  579                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
  580                                     ni->ni_rxseqs[tid] >>
  581                                         IEEE80211_SEQ_SEQ_SHIFT,
  582                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
  583                                     ni->ni_rxseqs[tid] &
  584                                         IEEE80211_SEQ_FRAG_MASK,
  585                                     tid);
  586                                 vap->iv_stats.is_rx_dup++;
  587                                 IEEE80211_NODE_STAT(ni, rx_dup);
  588                                 goto out;
  589                         }
  590                         ni->ni_rxseqs[tid] = rxseq;
  591                 }
  592         }
  593 
  594         switch (type) {
  595         case IEEE80211_FC0_TYPE_DATA:
  596                 hdrspace = ieee80211_hdrspace(ic, wh);
  597                 if (m->m_len < hdrspace &&
  598                     (m = m_pullup(m, hdrspace)) == NULL) {
  599                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  600                             ni->ni_macaddr, NULL,
  601                             "data too short: expecting %u", hdrspace);
  602                         vap->iv_stats.is_rx_tooshort++;
  603                         goto out;               /* XXX */
  604                 }
  605                 if (!(dir == IEEE80211_FC1_DIR_TODS ||
  606                      (dir == IEEE80211_FC1_DIR_DSTODS &&
  607                       (vap->iv_flags & IEEE80211_F_DWDS)))) {
  608                         if (dir != IEEE80211_FC1_DIR_DSTODS) {
  609                                 IEEE80211_DISCARD(vap,
  610                                     IEEE80211_MSG_INPUT, wh, "data",
  611                                     "incorrect dir 0x%x", dir);
  612                         } else {
  613                                 IEEE80211_DISCARD(vap,
  614                                     IEEE80211_MSG_INPUT |
  615                                     IEEE80211_MSG_WDS, wh,
  616                                     "4-address data",
  617                                     "%s", "DWDS not enabled");
  618                         }
  619                         vap->iv_stats.is_rx_wrongdir++;
  620                         goto out;
  621                 }
  622                 /* check if source STA is associated */
  623                 if (ni == vap->iv_bss) {
  624                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  625                             wh, "data", "%s", "unknown src");
  626                         ieee80211_send_error(ni, wh->i_addr2,
  627                             IEEE80211_FC0_SUBTYPE_DEAUTH,
  628                             IEEE80211_REASON_NOT_AUTHED);
  629                         vap->iv_stats.is_rx_notassoc++;
  630                         goto err;
  631                 }
  632                 if (ni->ni_associd == 0) {
  633                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  634                             wh, "data", "%s", "unassoc src");
  635                         IEEE80211_SEND_MGMT(ni,
  636                             IEEE80211_FC0_SUBTYPE_DISASSOC,
  637                             IEEE80211_REASON_NOT_ASSOCED);
  638                         vap->iv_stats.is_rx_notassoc++;
  639                         goto err;
  640                 }
  641 
  642                 /*
  643                  * Check for power save state change.
  644                  * XXX out-of-order A-MPDU frames?
  645                  */
  646                 if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
  647                     (ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
  648                         ieee80211_node_pwrsave(ni,
  649                                 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
  650                 /*
  651                  * For 4-address packets handle WDS discovery
  652                  * notifications.  Once a WDS link is setup frames
  653                  * are just delivered to the WDS vap (see below).
  654                  */
  655                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
  656                         if (!ieee80211_node_is_authorized(ni)) {
  657                                 IEEE80211_DISCARD(vap,
  658                                     IEEE80211_MSG_INPUT |
  659                                     IEEE80211_MSG_WDS, wh,
  660                                     "4-address data",
  661                                     "%s", "unauthorized port");
  662                                 vap->iv_stats.is_rx_unauth++;
  663                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  664                                 goto err;
  665                         }
  666                         ieee80211_dwds_discover(ni, m);
  667                         return type;
  668                 }
  669 
  670                 /*
  671                  * Handle A-MPDU re-ordering.  If the frame is to be
  672                  * processed directly then ieee80211_ampdu_reorder
  673                  * will return 0; otherwise it has consumed the mbuf
  674                  * and we should do nothing more with it.
  675                  */
  676                 if ((m->m_flags & M_AMPDU) &&
  677                     ieee80211_ampdu_reorder(ni, m) != 0) {
  678                         m = NULL;
  679                         goto out;
  680                 }
  681         resubmit_ampdu:
  682 
  683                 /*
  684                  * Handle privacy requirements.  Note that we
  685                  * must not be preempted from here until after
  686                  * we (potentially) call ieee80211_crypto_demic;
  687                  * otherwise we may violate assumptions in the
  688                  * crypto cipher modules used to do delayed update
  689                  * of replay sequence numbers.
  690                  */
  691                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  692                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  693                                 /*
  694                                  * Discard encrypted frames when privacy is off.
  695                                  */
  696                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  697                                     wh, "WEP", "%s", "PRIVACY off");
  698                                 vap->iv_stats.is_rx_noprivacy++;
  699                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  700                                 goto out;
  701                         }
  702                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  703                         if (key == NULL) {
  704                                 /* NB: stats+msgs handled in crypto_decap */
  705                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  706                                 goto out;
  707                         }
  708                         wh = mtod(m, struct ieee80211_frame *);
  709                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  710                 } else {
  711                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  712                         key = NULL;
  713                 }
  714 
  715                 /*
  716                  * Save QoS bits for use below--before we strip the header.
  717                  */
  718                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  719                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  720                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  721                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  722                 } else
  723                         qos = 0;
  724 
  725                 /*
  726                  * Next up, any fragmentation.
  727                  */
  728                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  729                         m = ieee80211_defrag(ni, m, hdrspace);
  730                         if (m == NULL) {
  731                                 /* Fragment dropped or frame not complete yet */
  732                                 goto out;
  733                         }
  734                 }
  735                 wh = NULL;              /* no longer valid, catch any uses */
  736 
  737                 /*
  738                  * Next strip any MSDU crypto bits.
  739                  */
  740                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  741                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  742                             ni->ni_macaddr, "data", "%s", "demic error");
  743                         vap->iv_stats.is_rx_demicfail++;
  744                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  745                         goto out;
  746                 }
  747                 /* copy to listener after decrypt */
  748                 if (ieee80211_radiotap_active_vap(vap))
  749                         ieee80211_radiotap_rx(vap, m);
  750                 need_tap = 0;
  751                 /*
  752                  * Finally, strip the 802.11 header.
  753                  */
  754                 m = ieee80211_decap(vap, m, hdrspace);
  755                 if (m == NULL) {
  756                         /* XXX mask bit to check for both */
  757                         /* don't count Null data frames as errors */
  758                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  759                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  760                                 goto out;
  761                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  762                             ni->ni_macaddr, "data", "%s", "decap error");
  763                         vap->iv_stats.is_rx_decap++;
  764                         IEEE80211_NODE_STAT(ni, rx_decap);
  765                         goto err;
  766                 }
  767                 eh = mtod(m, struct ether_header *);
  768                 if (!ieee80211_node_is_authorized(ni)) {
  769                         /*
  770                          * Deny any non-PAE frames received prior to
  771                          * authorization.  For open/shared-key
  772                          * authentication the port is mark authorized
  773                          * after authentication completes.  For 802.1x
  774                          * the port is not marked authorized by the
  775                          * authenticator until the handshake has completed.
  776                          */
  777                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  778                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  779                                     eh->ether_shost, "data",
  780                                     "unauthorized port: ether type 0x%x len %u",
  781                                     eh->ether_type, m->m_pkthdr.len);
  782                                 vap->iv_stats.is_rx_unauth++;
  783                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  784                                 goto err;
  785                         }
  786                 } else {
  787                         /*
  788                          * When denying unencrypted frames, discard
  789                          * any non-PAE frames received without encryption.
  790                          */
  791                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  792                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  793                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  794                                 /*
  795                                  * Drop unencrypted frames.
  796                                  */
  797                                 vap->iv_stats.is_rx_unencrypted++;
  798                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  799                                 goto out;
  800                         }
  801                 }
  802                 /* XXX require HT? */
  803                 if (qos & IEEE80211_QOS_AMSDU) {
  804                         m = ieee80211_decap_amsdu(ni, m);
  805                         if (m == NULL)
  806                                 return IEEE80211_FC0_TYPE_DATA;
  807                 } else {
  808 #ifdef IEEE80211_SUPPORT_SUPERG
  809                         m = ieee80211_decap_fastframe(vap, ni, m);
  810                         if (m == NULL)
  811                                 return IEEE80211_FC0_TYPE_DATA;
  812 #endif
  813                 }
  814                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
  815                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
  816                 else
  817                         hostap_deliver_data(vap, ni, m);
  818                 return IEEE80211_FC0_TYPE_DATA;
  819 
  820         case IEEE80211_FC0_TYPE_MGT:
  821                 vap->iv_stats.is_rx_mgmt++;
  822                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  823                 if (dir != IEEE80211_FC1_DIR_NODS) {
  824                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  825                             wh, "mgt", "incorrect dir 0x%x", dir);
  826                         vap->iv_stats.is_rx_wrongdir++;
  827                         goto err;
  828                 }
  829                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  830                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  831                             ni->ni_macaddr, "mgt", "too short: len %u",
  832                             m->m_pkthdr.len);
  833                         vap->iv_stats.is_rx_tooshort++;
  834                         goto out;
  835                 }
  836                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
  837                         /* ensure return frames are unicast */
  838                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  839                             wh, NULL, "source is multicast: %s",
  840                             ether_sprintf(wh->i_addr2));
  841                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
  842                         goto out;
  843                 }
  844 #ifdef IEEE80211_DEBUG
  845                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
  846                     ieee80211_msg_dumppkts(vap)) {
  847                         if_printf(ifp, "received %s from %s rssi %d\n",
  848                             ieee80211_mgt_subtype_name[subtype >>
  849                                 IEEE80211_FC0_SUBTYPE_SHIFT],
  850                             ether_sprintf(wh->i_addr2), rssi);
  851                 }
  852 #endif
  853                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  854                         if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
  855                                 /*
  856                                  * Only shared key auth frames with a challenge
  857                                  * should be encrypted, discard all others.
  858                                  */
  859                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  860                                     wh, NULL,
  861                                     "%s", "WEP set but not permitted");
  862                                 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  863                                 goto out;
  864                         }
  865                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  866                                 /*
  867                                  * Discard encrypted frames when privacy is off.
  868                                  */
  869                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  870                                     wh, NULL, "%s", "WEP set but PRIVACY off");
  871                                 vap->iv_stats.is_rx_noprivacy++;
  872                                 goto out;
  873                         }
  874                         hdrspace = ieee80211_hdrspace(ic, wh);
  875                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  876                         if (key == NULL) {
  877                                 /* NB: stats+msgs handled in crypto_decap */
  878                                 goto out;
  879                         }
  880                         wh = mtod(m, struct ieee80211_frame *);
  881                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  882                 }
  883                 /*
  884                  * Pass the packet to radiotap before calling iv_recv_mgmt().
  885                  * Otherwise iv_recv_mgmt() might pass another packet to
  886                  * radiotap, resulting in out of order packet captures.
  887                  */
  888                 if (ieee80211_radiotap_active_vap(vap))
  889                         ieee80211_radiotap_rx(vap, m);
  890                 need_tap = 0;
  891                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
  892                 goto out;
  893 
  894         case IEEE80211_FC0_TYPE_CTL:
  895                 vap->iv_stats.is_rx_ctl++;
  896                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  897                 vap->iv_recv_ctl(ni, m, subtype);
  898                 goto out;
  899         default:
  900                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  901                     wh, "bad", "frame type 0x%x", type);
  902                 /* should not come here */
  903                 break;
  904         }
  905 err:
  906         ifp->if_ierrors++;
  907 out:
  908         if (m != NULL) {
  909                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  910                         ieee80211_radiotap_rx(vap, m);
  911                 m_freem(m);
  912         }
  913         return type;
  914 }
  915 
  916 static void
  917 hostap_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  918     int rssi, int nf, uint16_t seq, uint16_t status)
  919 {
  920         struct ieee80211vap *vap = ni->ni_vap;
  921 
  922         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
  923 
  924         if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
  925                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
  926                     ni->ni_macaddr, "open auth",
  927                     "bad sta auth mode %u", ni->ni_authmode);
  928                 vap->iv_stats.is_rx_bad_auth++; /* XXX */
  929                 /*
  930                  * Clear any challenge text that may be there if
  931                  * a previous shared key auth failed and then an
  932                  * open auth is attempted.
  933                  */
  934                 if (ni->ni_challenge != NULL) {
  935                         free(ni->ni_challenge, M_80211_NODE);
  936                         ni->ni_challenge = NULL;
  937                 }
  938                 /* XXX hack to workaround calling convention */
  939                 ieee80211_send_error(ni, wh->i_addr2, 
  940                     IEEE80211_FC0_SUBTYPE_AUTH,
  941                     (seq + 1) | (IEEE80211_STATUS_ALG<<16));
  942                 return;
  943         }
  944         if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
  945                 vap->iv_stats.is_rx_bad_auth++;
  946                 return;
  947         }
  948         /* always accept open authentication requests */
  949         if (ni == vap->iv_bss) {
  950                 ni = ieee80211_dup_bss(vap, wh->i_addr2);
  951                 if (ni == NULL)
  952                         return;
  953         } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
  954                 (void) ieee80211_ref_node(ni);
  955         /*
  956          * Mark the node as referenced to reflect that it's
  957          * reference count has been bumped to insure it remains
  958          * after the transaction completes.
  959          */
  960         ni->ni_flags |= IEEE80211_NODE_AREF;
  961         /*
  962          * Mark the node as requiring a valid association id
  963          * before outbound traffic is permitted.
  964          */
  965         ni->ni_flags |= IEEE80211_NODE_ASSOCID;
  966 
  967         if (vap->iv_acl != NULL &&
  968             vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
  969                 /*
  970                  * When the ACL policy is set to RADIUS we defer the
  971                  * authorization to a user agent.  Dispatch an event,
  972                  * a subsequent MLME call will decide the fate of the
  973                  * station.  If the user agent is not present then the
  974                  * node will be reclaimed due to inactivity.
  975                  */
  976                 IEEE80211_NOTE_MAC(vap,
  977                     IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
  978                     "%s", "station authentication defered (radius acl)");
  979                 ieee80211_notify_node_auth(ni);
  980         } else {
  981                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
  982                 IEEE80211_NOTE_MAC(vap,
  983                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
  984                     "%s", "station authenticated (open)");
  985                 /*
  986                  * When 802.1x is not in use mark the port
  987                  * authorized at this point so traffic can flow.
  988                  */
  989                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  990                         ieee80211_node_authorize(ni);
  991         }
  992 }
  993 
  994 static void
  995 hostap_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
  996     uint8_t *frm, uint8_t *efrm, int rssi, int nf,
  997     uint16_t seq, uint16_t status)
  998 {
  999         struct ieee80211vap *vap = ni->ni_vap;
 1000         uint8_t *challenge;
 1001         int allocbs, estatus;
 1002 
 1003         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
 1004 
 1005         /*
 1006          * NB: this can happen as we allow pre-shared key
 1007          * authentication to be enabled w/o wep being turned
 1008          * on so that configuration of these can be done
 1009          * in any order.  It may be better to enforce the
 1010          * ordering in which case this check would just be
 1011          * for sanity/consistency.
 1012          */
 1013         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 1014                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1015                     ni->ni_macaddr, "shared key auth",
 1016                     "%s", " PRIVACY is disabled");
 1017                 estatus = IEEE80211_STATUS_ALG;
 1018                 goto bad;
 1019         }
 1020         /*
 1021          * Pre-shared key authentication is evil; accept
 1022          * it only if explicitly configured (it is supported
 1023          * mainly for compatibility with clients like Mac OS X).
 1024          */
 1025         if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
 1026             ni->ni_authmode != IEEE80211_AUTH_SHARED) {
 1027                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1028                     ni->ni_macaddr, "shared key auth",
 1029                     "bad sta auth mode %u", ni->ni_authmode);
 1030                 vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
 1031                 estatus = IEEE80211_STATUS_ALG;
 1032                 goto bad;
 1033         }
 1034 
 1035         challenge = NULL;
 1036         if (frm + 1 < efrm) {
 1037                 if ((frm[1] + 2) > (efrm - frm)) {
 1038                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1039                             ni->ni_macaddr, "shared key auth",
 1040                             "ie %d/%d too long",
 1041                             frm[0], (frm[1] + 2) - (efrm - frm));
 1042                         vap->iv_stats.is_rx_bad_auth++;
 1043                         estatus = IEEE80211_STATUS_CHALLENGE;
 1044                         goto bad;
 1045                 }
 1046                 if (*frm == IEEE80211_ELEMID_CHALLENGE)
 1047                         challenge = frm;
 1048                 frm += frm[1] + 2;
 1049         }
 1050         switch (seq) {
 1051         case IEEE80211_AUTH_SHARED_CHALLENGE:
 1052         case IEEE80211_AUTH_SHARED_RESPONSE:
 1053                 if (challenge == NULL) {
 1054                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1055                             ni->ni_macaddr, "shared key auth",
 1056                             "%s", "no challenge");
 1057                         vap->iv_stats.is_rx_bad_auth++;
 1058                         estatus = IEEE80211_STATUS_CHALLENGE;
 1059                         goto bad;
 1060                 }
 1061                 if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
 1062                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1063                             ni->ni_macaddr, "shared key auth",
 1064                             "bad challenge len %d", challenge[1]);
 1065                         vap->iv_stats.is_rx_bad_auth++;
 1066                         estatus = IEEE80211_STATUS_CHALLENGE;
 1067                         goto bad;
 1068                 }
 1069         default:
 1070                 break;
 1071         }
 1072         switch (seq) {
 1073         case IEEE80211_AUTH_SHARED_REQUEST:
 1074                 if (ni == vap->iv_bss) {
 1075                         ni = ieee80211_dup_bss(vap, wh->i_addr2);
 1076                         if (ni == NULL) {
 1077                                 /* NB: no way to return an error */
 1078                                 return;
 1079                         }
 1080                         allocbs = 1;
 1081                 } else {
 1082                         if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
 1083                                 (void) ieee80211_ref_node(ni);
 1084                         allocbs = 0;
 1085                 }
 1086                 /*
 1087                  * Mark the node as referenced to reflect that it's
 1088                  * reference count has been bumped to insure it remains
 1089                  * after the transaction completes.
 1090                  */
 1091                 ni->ni_flags |= IEEE80211_NODE_AREF;
 1092                 /*
 1093                  * Mark the node as requiring a valid associatio id
 1094                  * before outbound traffic is permitted.
 1095                  */
 1096                 ni->ni_flags |= IEEE80211_NODE_ASSOCID;
 1097                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 1098                 ni->ni_noise = nf;
 1099                 if (!ieee80211_alloc_challenge(ni)) {
 1100                         /* NB: don't return error so they rexmit */
 1101                         return;
 1102                 }
 1103                 get_random_bytes(ni->ni_challenge,
 1104                         IEEE80211_CHALLENGE_LEN);
 1105                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 1106                     ni, "shared key %sauth request", allocbs ? "" : "re");
 1107                 /*
 1108                  * When the ACL policy is set to RADIUS we defer the
 1109                  * authorization to a user agent.  Dispatch an event,
 1110                  * a subsequent MLME call will decide the fate of the
 1111                  * station.  If the user agent is not present then the
 1112                  * node will be reclaimed due to inactivity.
 1113                  */
 1114                 if (vap->iv_acl != NULL &&
 1115                     vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
 1116                         IEEE80211_NOTE_MAC(vap,
 1117                             IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
 1118                             ni->ni_macaddr,
 1119                             "%s", "station authentication defered (radius acl)");
 1120                         ieee80211_notify_node_auth(ni);
 1121                         return;
 1122                 }
 1123                 break;
 1124         case IEEE80211_AUTH_SHARED_RESPONSE:
 1125                 if (ni == vap->iv_bss) {
 1126                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1127                             ni->ni_macaddr, "shared key response",
 1128                             "%s", "unknown station");
 1129                         /* NB: don't send a response */
 1130                         return;
 1131                 }
 1132                 if (ni->ni_challenge == NULL) {
 1133                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1134                             ni->ni_macaddr, "shared key response",
 1135                             "%s", "no challenge recorded");
 1136                         vap->iv_stats.is_rx_bad_auth++;
 1137                         estatus = IEEE80211_STATUS_CHALLENGE;
 1138                         goto bad;
 1139                 }
 1140                 if (memcmp(ni->ni_challenge, &challenge[2],
 1141                            challenge[1]) != 0) {
 1142                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1143                             ni->ni_macaddr, "shared key response",
 1144                             "%s", "challenge mismatch");
 1145                         vap->iv_stats.is_rx_auth_fail++;
 1146                         estatus = IEEE80211_STATUS_CHALLENGE;
 1147                         goto bad;
 1148                 }
 1149                 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
 1150                     ni, "%s", "station authenticated (shared key)");
 1151                 ieee80211_node_authorize(ni);
 1152                 break;
 1153         default:
 1154                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
 1155                     ni->ni_macaddr, "shared key auth",
 1156                     "bad seq %d", seq);
 1157                 vap->iv_stats.is_rx_bad_auth++;
 1158                 estatus = IEEE80211_STATUS_SEQUENCE;
 1159                 goto bad;
 1160         }
 1161         IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
 1162         return;
 1163 bad:
 1164         /*
 1165          * Send an error response; but only when operating as an AP.
 1166          */
 1167         /* XXX hack to workaround calling convention */
 1168         ieee80211_send_error(ni, wh->i_addr2,
 1169             IEEE80211_FC0_SUBTYPE_AUTH,
 1170             (seq + 1) | (estatus<<16));
 1171 }
 1172 
 1173 /*
 1174  * Convert a WPA cipher selector OUI to an internal
 1175  * cipher algorithm.  Where appropriate we also
 1176  * record any key length.
 1177  */
 1178 static int
 1179 wpa_cipher(const uint8_t *sel, uint8_t *keylen)
 1180 {
 1181 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
 1182         uint32_t w = LE_READ_4(sel);
 1183 
 1184         switch (w) {
 1185         case WPA_SEL(WPA_CSE_NULL):
 1186                 return IEEE80211_CIPHER_NONE;
 1187         case WPA_SEL(WPA_CSE_WEP40):
 1188                 if (keylen)
 1189                         *keylen = 40 / NBBY;
 1190                 return IEEE80211_CIPHER_WEP;
 1191         case WPA_SEL(WPA_CSE_WEP104):
 1192                 if (keylen)
 1193                         *keylen = 104 / NBBY;
 1194                 return IEEE80211_CIPHER_WEP;
 1195         case WPA_SEL(WPA_CSE_TKIP):
 1196                 return IEEE80211_CIPHER_TKIP;
 1197         case WPA_SEL(WPA_CSE_CCMP):
 1198                 return IEEE80211_CIPHER_AES_CCM;
 1199         }
 1200         return 32;              /* NB: so 1<< is discarded */
 1201 #undef WPA_SEL
 1202 }
 1203 
 1204 /*
 1205  * Convert a WPA key management/authentication algorithm
 1206  * to an internal code.
 1207  */
 1208 static int
 1209 wpa_keymgmt(const uint8_t *sel)
 1210 {
 1211 #define WPA_SEL(x)      (((x)<<24)|WPA_OUI)
 1212         uint32_t w = LE_READ_4(sel);
 1213 
 1214         switch (w) {
 1215         case WPA_SEL(WPA_ASE_8021X_UNSPEC):
 1216                 return WPA_ASE_8021X_UNSPEC;
 1217         case WPA_SEL(WPA_ASE_8021X_PSK):
 1218                 return WPA_ASE_8021X_PSK;
 1219         case WPA_SEL(WPA_ASE_NONE):
 1220                 return WPA_ASE_NONE;
 1221         }
 1222         return 0;               /* NB: so is discarded */
 1223 #undef WPA_SEL
 1224 }
 1225 
 1226 /*
 1227  * Parse a WPA information element to collect parameters.
 1228  * Note that we do not validate security parameters; that
 1229  * is handled by the authenticator; the parsing done here
 1230  * is just for internal use in making operational decisions.
 1231  */
 1232 static int
 1233 ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
 1234         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
 1235 {
 1236         uint8_t len = frm[1];
 1237         uint32_t w;
 1238         int n;
 1239 
 1240         /*
 1241          * Check the length once for fixed parts: OUI, type,
 1242          * version, mcast cipher, and 2 selector counts.
 1243          * Other, variable-length data, must be checked separately.
 1244          */
 1245         if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
 1246                 IEEE80211_DISCARD_IE(vap,
 1247                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1248                     wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
 1249                 return IEEE80211_REASON_IE_INVALID;
 1250         }
 1251         if (len < 14) {
 1252                 IEEE80211_DISCARD_IE(vap,
 1253                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1254                     wh, "WPA", "too short, len %u", len);
 1255                 return IEEE80211_REASON_IE_INVALID;
 1256         }
 1257         frm += 6, len -= 4;             /* NB: len is payload only */
 1258         /* NB: iswpaoui already validated the OUI and type */
 1259         w = LE_READ_2(frm);
 1260         if (w != WPA_VERSION) {
 1261                 IEEE80211_DISCARD_IE(vap,
 1262                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1263                     wh, "WPA", "bad version %u", w);
 1264                 return IEEE80211_REASON_IE_INVALID;
 1265         }
 1266         frm += 2, len -= 2;
 1267 
 1268         memset(rsn, 0, sizeof(*rsn));
 1269 
 1270         /* multicast/group cipher */
 1271         rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
 1272         frm += 4, len -= 4;
 1273 
 1274         /* unicast ciphers */
 1275         n = LE_READ_2(frm);
 1276         frm += 2, len -= 2;
 1277         if (len < n*4+2) {
 1278                 IEEE80211_DISCARD_IE(vap,
 1279                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1280                     wh, "WPA", "ucast cipher data too short; len %u, n %u",
 1281                     len, n);
 1282                 return IEEE80211_REASON_IE_INVALID;
 1283         }
 1284         w = 0;
 1285         for (; n > 0; n--) {
 1286                 w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
 1287                 frm += 4, len -= 4;
 1288         }
 1289         if (w & (1<<IEEE80211_CIPHER_TKIP))
 1290                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
 1291         else
 1292                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
 1293 
 1294         /* key management algorithms */
 1295         n = LE_READ_2(frm);
 1296         frm += 2, len -= 2;
 1297         if (len < n*4) {
 1298                 IEEE80211_DISCARD_IE(vap,
 1299                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1300                     wh, "WPA", "key mgmt alg data too short; len %u, n %u",
 1301                     len, n);
 1302                 return IEEE80211_REASON_IE_INVALID;
 1303         }
 1304         w = 0;
 1305         for (; n > 0; n--) {
 1306                 w |= wpa_keymgmt(frm);
 1307                 frm += 4, len -= 4;
 1308         }
 1309         if (w & WPA_ASE_8021X_UNSPEC)
 1310                 rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
 1311         else
 1312                 rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
 1313 
 1314         if (len > 2)            /* optional capabilities */
 1315                 rsn->rsn_caps = LE_READ_2(frm);
 1316 
 1317         return 0;
 1318 }
 1319 
 1320 /*
 1321  * Convert an RSN cipher selector OUI to an internal
 1322  * cipher algorithm.  Where appropriate we also
 1323  * record any key length.
 1324  */
 1325 static int
 1326 rsn_cipher(const uint8_t *sel, uint8_t *keylen)
 1327 {
 1328 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
 1329         uint32_t w = LE_READ_4(sel);
 1330 
 1331         switch (w) {
 1332         case RSN_SEL(RSN_CSE_NULL):
 1333                 return IEEE80211_CIPHER_NONE;
 1334         case RSN_SEL(RSN_CSE_WEP40):
 1335                 if (keylen)
 1336                         *keylen = 40 / NBBY;
 1337                 return IEEE80211_CIPHER_WEP;
 1338         case RSN_SEL(RSN_CSE_WEP104):
 1339                 if (keylen)
 1340                         *keylen = 104 / NBBY;
 1341                 return IEEE80211_CIPHER_WEP;
 1342         case RSN_SEL(RSN_CSE_TKIP):
 1343                 return IEEE80211_CIPHER_TKIP;
 1344         case RSN_SEL(RSN_CSE_CCMP):
 1345                 return IEEE80211_CIPHER_AES_CCM;
 1346         case RSN_SEL(RSN_CSE_WRAP):
 1347                 return IEEE80211_CIPHER_AES_OCB;
 1348         }
 1349         return 32;              /* NB: so 1<< is discarded */
 1350 #undef WPA_SEL
 1351 }
 1352 
 1353 /*
 1354  * Convert an RSN key management/authentication algorithm
 1355  * to an internal code.
 1356  */
 1357 static int
 1358 rsn_keymgmt(const uint8_t *sel)
 1359 {
 1360 #define RSN_SEL(x)      (((x)<<24)|RSN_OUI)
 1361         uint32_t w = LE_READ_4(sel);
 1362 
 1363         switch (w) {
 1364         case RSN_SEL(RSN_ASE_8021X_UNSPEC):
 1365                 return RSN_ASE_8021X_UNSPEC;
 1366         case RSN_SEL(RSN_ASE_8021X_PSK):
 1367                 return RSN_ASE_8021X_PSK;
 1368         case RSN_SEL(RSN_ASE_NONE):
 1369                 return RSN_ASE_NONE;
 1370         }
 1371         return 0;               /* NB: so is discarded */
 1372 #undef RSN_SEL
 1373 }
 1374 
 1375 /*
 1376  * Parse a WPA/RSN information element to collect parameters
 1377  * and validate the parameters against what has been
 1378  * configured for the system.
 1379  */
 1380 static int
 1381 ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
 1382         struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
 1383 {
 1384         uint8_t len = frm[1];
 1385         uint32_t w;
 1386         int n;
 1387 
 1388         /*
 1389          * Check the length once for fixed parts: 
 1390          * version, mcast cipher, and 2 selector counts.
 1391          * Other, variable-length data, must be checked separately.
 1392          */
 1393         if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
 1394                 IEEE80211_DISCARD_IE(vap,
 1395                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1396                     wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
 1397                 return IEEE80211_REASON_IE_INVALID;
 1398         }
 1399         if (len < 10) {
 1400                 IEEE80211_DISCARD_IE(vap,
 1401                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1402                     wh, "RSN", "too short, len %u", len);
 1403                 return IEEE80211_REASON_IE_INVALID;
 1404         }
 1405         frm += 2;
 1406         w = LE_READ_2(frm);
 1407         if (w != RSN_VERSION) {
 1408                 IEEE80211_DISCARD_IE(vap,
 1409                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1410                     wh, "RSN", "bad version %u", w);
 1411                 return IEEE80211_REASON_IE_INVALID;
 1412         }
 1413         frm += 2, len -= 2;
 1414 
 1415         memset(rsn, 0, sizeof(*rsn));
 1416 
 1417         /* multicast/group cipher */
 1418         rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
 1419         frm += 4, len -= 4;
 1420 
 1421         /* unicast ciphers */
 1422         n = LE_READ_2(frm);
 1423         frm += 2, len -= 2;
 1424         if (len < n*4+2) {
 1425                 IEEE80211_DISCARD_IE(vap,
 1426                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1427                     wh, "RSN", "ucast cipher data too short; len %u, n %u",
 1428                     len, n);
 1429                 return IEEE80211_REASON_IE_INVALID;
 1430         }
 1431         w = 0;
 1432         for (; n > 0; n--) {
 1433                 w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
 1434                 frm += 4, len -= 4;
 1435         }
 1436         if (w & (1<<IEEE80211_CIPHER_TKIP))
 1437                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
 1438         else
 1439                 rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
 1440 
 1441         /* key management algorithms */
 1442         n = LE_READ_2(frm);
 1443         frm += 2, len -= 2;
 1444         if (len < n*4) {
 1445                 IEEE80211_DISCARD_IE(vap,
 1446                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
 1447                     wh, "RSN", "key mgmt alg data too short; len %u, n %u",
 1448                     len, n);
 1449                 return IEEE80211_REASON_IE_INVALID;
 1450         }
 1451         w = 0;
 1452         for (; n > 0; n--) {
 1453                 w |= rsn_keymgmt(frm);
 1454                 frm += 4, len -= 4;
 1455         }
 1456         if (w & RSN_ASE_8021X_UNSPEC)
 1457                 rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
 1458         else
 1459                 rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
 1460 
 1461         /* optional RSN capabilities */
 1462         if (len > 2)
 1463                 rsn->rsn_caps = LE_READ_2(frm);
 1464         /* XXXPMKID */
 1465 
 1466         return 0;
 1467 }
 1468 
 1469 /*
 1470  * WPA/802.11i assocation request processing.
 1471  */
 1472 static int
 1473 wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
 1474         const struct ieee80211_frame *wh, const uint8_t *wpa,
 1475         const uint8_t *rsn, uint16_t capinfo)
 1476 {
 1477         struct ieee80211vap *vap = ni->ni_vap;
 1478         uint8_t reason;
 1479         int badwparsn;
 1480 
 1481         ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
 1482         if (wpa == NULL && rsn == NULL) {
 1483                 if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
 1484                         /*
 1485                          * W-Fi Protected Setup (WPS) permits
 1486                          * clients to associate and pass EAPOL frames
 1487                          * to establish initial credentials.
 1488                          */
 1489                         ni->ni_flags |= IEEE80211_NODE_WPS;
 1490                         return 1;
 1491                 }
 1492                 if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
 1493                     (capinfo & IEEE80211_CAPINFO_PRIVACY)) {
 1494                         /* 
 1495                          * Transitional Security Network.  Permits clients
 1496                          * to associate and use WEP while WPA is configured.
 1497                          */
 1498                         ni->ni_flags |= IEEE80211_NODE_TSN;
 1499                         return 1;
 1500                 }
 1501                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
 1502                     wh, NULL, "%s", "no WPA/RSN IE in association request");
 1503                 vap->iv_stats.is_rx_assoc_badwpaie++;
 1504                 reason = IEEE80211_REASON_IE_INVALID;
 1505                 goto bad;
 1506         }
 1507         /* assert right association security credentials */
 1508         badwparsn = 0;                  /* NB: to silence compiler */
 1509         switch (vap->iv_flags & IEEE80211_F_WPA) {
 1510         case IEEE80211_F_WPA1:
 1511                 badwparsn = (wpa == NULL);
 1512                 break;
 1513         case IEEE80211_F_WPA2:
 1514                 badwparsn = (rsn == NULL);
 1515                 break;
 1516         case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
 1517                 badwparsn = (wpa == NULL && rsn == NULL);
 1518                 break;
 1519         }
 1520         if (badwparsn) {
 1521                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
 1522                     wh, NULL,
 1523                     "%s", "missing WPA/RSN IE in association request");
 1524                 vap->iv_stats.is_rx_assoc_badwpaie++;
 1525                 reason = IEEE80211_REASON_IE_INVALID;
 1526                 goto bad;
 1527         }
 1528         /*
 1529          * Parse WPA/RSN information element.
 1530          */
 1531         if (wpa != NULL)
 1532                 reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
 1533         else
 1534                 reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
 1535         if (reason != 0) {
 1536                 /* XXX distinguish WPA/RSN? */
 1537                 vap->iv_stats.is_rx_assoc_badwpaie++;
 1538                 goto bad;
 1539         }
 1540         IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
 1541             "%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
 1542             wpa != NULL ? "WPA" : "RSN",
 1543             rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
 1544             rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
 1545             rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
 1546 
 1547         return 1;
 1548 bad:
 1549         ieee80211_node_deauth(ni, reason);
 1550         return 0;
 1551 }
 1552 
 1553 /* XXX find a better place for definition */
 1554 struct l2_update_frame {
 1555         struct ether_header eh;
 1556         uint8_t dsap;
 1557         uint8_t ssap;
 1558         uint8_t control;
 1559         uint8_t xid[3];
 1560 }  __packed;
 1561 
 1562 /*
 1563  * Deliver a TGf L2UF frame on behalf of a station.
 1564  * This primes any bridge when the station is roaming
 1565  * between ap's on the same wired network.
 1566  */
 1567 static void
 1568 ieee80211_deliver_l2uf(struct ieee80211_node *ni)
 1569 {
 1570         struct ieee80211vap *vap = ni->ni_vap;
 1571         struct ifnet *ifp = vap->iv_ifp;
 1572         struct mbuf *m;
 1573         struct l2_update_frame *l2uf;
 1574         struct ether_header *eh;
 1575         
 1576         m = m_gethdr(M_NOWAIT, MT_DATA);
 1577         if (m == NULL) {
 1578                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 1579                     "%s", "no mbuf for l2uf frame");
 1580                 vap->iv_stats.is_rx_nobuf++;    /* XXX not right */
 1581                 return;
 1582         }
 1583         l2uf = mtod(m, struct l2_update_frame *);
 1584         eh = &l2uf->eh;
 1585         /* dst: Broadcast address */
 1586         IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
 1587         /* src: associated STA */
 1588         IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
 1589         eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
 1590         
 1591         l2uf->dsap = 0;
 1592         l2uf->ssap = 0;
 1593         l2uf->control = 0xf5;
 1594         l2uf->xid[0] = 0x81;
 1595         l2uf->xid[1] = 0x80;
 1596         l2uf->xid[2] = 0x00;
 1597         
 1598         m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
 1599         hostap_deliver_data(vap, ni, m);
 1600 }
 1601 
 1602 static void
 1603 ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
 1604         int reassoc, int resp, const char *tag, int rate)
 1605 {
 1606         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
 1607             "deny %s request, %s rate set mismatch, rate/MCS %d",
 1608             reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
 1609         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
 1610         ieee80211_node_leave(ni);
 1611 }
 1612 
 1613 static void
 1614 capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
 1615         int reassoc, int resp, const char *tag, int capinfo)
 1616 {
 1617         struct ieee80211vap *vap = ni->ni_vap;
 1618 
 1619         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
 1620             "deny %s request, %s mismatch 0x%x",
 1621             reassoc ? "reassoc" : "assoc", tag, capinfo);
 1622         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
 1623         ieee80211_node_leave(ni);
 1624         vap->iv_stats.is_rx_assoc_capmismatch++;
 1625 }
 1626 
 1627 static void
 1628 htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
 1629         int reassoc, int resp)
 1630 {
 1631         IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
 1632             "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
 1633         /* XXX no better code */
 1634         IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
 1635         ieee80211_node_leave(ni);
 1636 }
 1637 
 1638 static void
 1639 authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
 1640         int algo, int seq, int status)
 1641 {
 1642         struct ieee80211vap *vap = ni->ni_vap;
 1643 
 1644         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1645             wh, NULL, "unsupported alg %d", algo);
 1646         vap->iv_stats.is_rx_auth_unsupported++;
 1647         ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
 1648             seq | (status << 16));
 1649 }
 1650 
 1651 static __inline int
 1652 ishtmixed(const uint8_t *ie)
 1653 {
 1654         const struct ieee80211_ie_htinfo *ht =
 1655             (const struct ieee80211_ie_htinfo *) ie;
 1656         return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
 1657             IEEE80211_HTINFO_OPMODE_MIXED;
 1658 }
 1659 
 1660 static int
 1661 is11bclient(const uint8_t *rates, const uint8_t *xrates)
 1662 {
 1663         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
 1664         int i;
 1665 
 1666         /* NB: the 11b clients we care about will not have xrates */
 1667         if (xrates != NULL || rates == NULL)
 1668                 return 0;
 1669         for (i = 0; i < rates[1]; i++) {
 1670                 int r = rates[2+i] & IEEE80211_RATE_VAL;
 1671                 if (r > 2*11 || ((1<<r) & brates) == 0)
 1672                         return 0;
 1673         }
 1674         return 1;
 1675 }
 1676 
 1677 static void
 1678 hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 1679         int subtype, int rssi, int nf)
 1680 {
 1681         struct ieee80211vap *vap = ni->ni_vap;
 1682         struct ieee80211com *ic = ni->ni_ic;
 1683         struct ieee80211_frame *wh;
 1684         uint8_t *frm, *efrm, *sfrm;
 1685         uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
 1686         int reassoc, resp;
 1687         uint8_t rate;
 1688 
 1689         wh = mtod(m0, struct ieee80211_frame *);
 1690         frm = (uint8_t *)&wh[1];
 1691         efrm = mtod(m0, uint8_t *) + m0->m_len;
 1692         switch (subtype) {
 1693         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 1694         case IEEE80211_FC0_SUBTYPE_BEACON: {
 1695                 struct ieee80211_scanparams scan;
 1696                 /*
 1697                  * We process beacon/probe response frames when scanning;
 1698                  * otherwise we check beacon frames for overlapping non-ERP
 1699                  * BSS in 11g and/or overlapping legacy BSS when in HT.
 1700                  */ 
 1701                 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
 1702                     subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
 1703                         vap->iv_stats.is_rx_mgtdiscard++;
 1704                         return;
 1705                 }
 1706                 /* NB: accept off-channel frames */
 1707                 if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
 1708                         return;
 1709                 /*
 1710                  * Count frame now that we know it's to be processed.
 1711                  */
 1712                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
 1713                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
 1714                         IEEE80211_NODE_STAT(ni, rx_beacons);
 1715                 } else
 1716                         IEEE80211_NODE_STAT(ni, rx_proberesp);
 1717                 /*
 1718                  * If scanning, just pass information to the scan module.
 1719                  */
 1720                 if (ic->ic_flags & IEEE80211_F_SCAN) {
 1721                         if (scan.status == 0 &&         /* NB: on channel */
 1722                             (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN)) {
 1723                                 /*
 1724                                  * Actively scanning a channel marked passive;
 1725                                  * send a probe request now that we know there
 1726                                  * is 802.11 traffic present.
 1727                                  *
 1728                                  * XXX check if the beacon we recv'd gives
 1729                                  * us what we need and suppress the probe req
 1730                                  */
 1731                                 ieee80211_probe_curchan(vap, 1);
 1732                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
 1733                         }
 1734                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
 1735                         return;
 1736                 }
 1737                 /*
 1738                  * Check beacon for overlapping bss w/ non ERP stations.
 1739                  * If we detect one and protection is configured but not
 1740                  * enabled, enable it and start a timer that'll bring us
 1741                  * out if we stop seeing the bss.
 1742                  */
 1743                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 1744                     scan.status == 0 &&                 /* NB: on-channel */
 1745                     ((scan.erp & 0x100) == 0 ||         /* NB: no ERP, 11b sta*/
 1746                      (scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
 1747                         ic->ic_lastnonerp = ticks;
 1748                         ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
 1749                         if (ic->ic_protmode != IEEE80211_PROT_NONE &&
 1750                             (ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
 1751                                 IEEE80211_NOTE_FRAME(vap,
 1752                                     IEEE80211_MSG_ASSOC, wh,
 1753                                     "non-ERP present on channel %d "
 1754                                     "(saw erp 0x%x from channel %d), "
 1755                                     "enable use of protection",
 1756                                     ic->ic_curchan->ic_ieee,
 1757                                     scan.erp, scan.chan);
 1758                                 ic->ic_flags |= IEEE80211_F_USEPROT;
 1759                                 ieee80211_notify_erp(ic);
 1760                         }
 1761                 }
 1762                 /* 
 1763                  * Check beacon for non-HT station on HT channel
 1764                  * and update HT BSS occupancy as appropriate.
 1765                  */
 1766                 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
 1767                         if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
 1768                                 /*
 1769                                  * Off control channel; only check frames
 1770                                  * that come in the extension channel when
 1771                                  * operating w/ HT40.
 1772                                  */
 1773                                 if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
 1774                                         break;
 1775                                 if (scan.chan != ic->ic_curchan->ic_extieee)
 1776                                         break;
 1777                         }
 1778                         if (scan.htinfo == NULL) {
 1779                                 ieee80211_htprot_update(ic,
 1780                                     IEEE80211_HTINFO_OPMODE_PROTOPT |
 1781                                     IEEE80211_HTINFO_NONHT_PRESENT);
 1782                         } else if (ishtmixed(scan.htinfo)) {
 1783                                 /* XXX? take NONHT_PRESENT from beacon? */
 1784                                 ieee80211_htprot_update(ic,
 1785                                     IEEE80211_HTINFO_OPMODE_MIXED |
 1786                                     IEEE80211_HTINFO_NONHT_PRESENT);
 1787                         }
 1788                 }
 1789                 break;
 1790         }
 1791 
 1792         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 1793                 if (vap->iv_state != IEEE80211_S_RUN) {
 1794                         vap->iv_stats.is_rx_mgtdiscard++;
 1795                         return;
 1796                 }
 1797                 /*
 1798                  * prreq frame format
 1799                  *      [tlv] ssid
 1800                  *      [tlv] supported rates
 1801                  *      [tlv] extended supported rates
 1802                  */
 1803                 ssid = rates = xrates = NULL;
 1804                 sfrm = frm;
 1805                 while (efrm - frm > 1) {
 1806                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1807                         switch (*frm) {
 1808                         case IEEE80211_ELEMID_SSID:
 1809                                 ssid = frm;
 1810                                 break;
 1811                         case IEEE80211_ELEMID_RATES:
 1812                                 rates = frm;
 1813                                 break;
 1814                         case IEEE80211_ELEMID_XRATES:
 1815                                 xrates = frm;
 1816                                 break;
 1817                         }
 1818                         frm += frm[1] + 2;
 1819                 }
 1820                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 1821                 if (xrates != NULL)
 1822                         IEEE80211_VERIFY_ELEMENT(xrates,
 1823                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 1824                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 1825                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 1826                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
 1827                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 1828                             wh, NULL,
 1829                             "%s", "no ssid with ssid suppression enabled");
 1830                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
 1831                         return;
 1832                 }
 1833 
 1834                 /* XXX find a better class or define it's own */
 1835                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
 1836                     "%s", "recv probe req");
 1837                 /*
 1838                  * Some legacy 11b clients cannot hack a complete
 1839                  * probe response frame.  When the request includes
 1840                  * only a bare-bones rate set, communicate this to
 1841                  * the transmit side.
 1842                  */
 1843                 ieee80211_send_proberesp(vap, wh->i_addr2,
 1844                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
 1845                 break;
 1846 
 1847         case IEEE80211_FC0_SUBTYPE_AUTH: {
 1848                 uint16_t algo, seq, status;
 1849 
 1850                 if (vap->iv_state != IEEE80211_S_RUN) {
 1851                         vap->iv_stats.is_rx_mgtdiscard++;
 1852                         return;
 1853                 }
 1854                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
 1855                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1856                             wh, NULL, "%s", "wrong bssid");
 1857                         vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
 1858                         return;
 1859                 }
 1860                 /*
 1861                  * auth frame format
 1862                  *      [2] algorithm
 1863                  *      [2] sequence
 1864                  *      [2] status
 1865                  *      [tlv*] challenge
 1866                  */
 1867                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
 1868                 algo   = le16toh(*(uint16_t *)frm);
 1869                 seq    = le16toh(*(uint16_t *)(frm + 2));
 1870                 status = le16toh(*(uint16_t *)(frm + 4));
 1871                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
 1872                     "recv auth frame with algorithm %d seq %d", algo, seq);
 1873                 /*
 1874                  * Consult the ACL policy module if setup.
 1875                  */
 1876                 if (vap->iv_acl != NULL &&
 1877                     !vap->iv_acl->iac_check(vap, wh->i_addr2)) {
 1878                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
 1879                             wh, NULL, "%s", "disallowed by ACL");
 1880                         vap->iv_stats.is_rx_acl++;
 1881                         ieee80211_send_error(ni, wh->i_addr2,
 1882                             IEEE80211_FC0_SUBTYPE_AUTH,
 1883                             (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
 1884                         return;
 1885                 }
 1886                 if (vap->iv_flags & IEEE80211_F_COUNTERM) {
 1887                         IEEE80211_DISCARD(vap,
 1888                             IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
 1889                             wh, NULL, "%s", "TKIP countermeasures enabled");
 1890                         vap->iv_stats.is_rx_auth_countermeasures++;
 1891                         ieee80211_send_error(ni, wh->i_addr2,
 1892                                 IEEE80211_FC0_SUBTYPE_AUTH,
 1893                                 IEEE80211_REASON_MIC_FAILURE);
 1894                         return;
 1895                 }
 1896                 if (algo == IEEE80211_AUTH_ALG_SHARED)
 1897                         hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
 1898                             seq, status);
 1899                 else if (algo == IEEE80211_AUTH_ALG_OPEN)
 1900                         hostap_auth_open(ni, wh, rssi, nf, seq, status);
 1901                 else if (algo == IEEE80211_AUTH_ALG_LEAP) {
 1902                         authalgreject(ni, wh, algo,
 1903                             seq+1, IEEE80211_STATUS_ALG);
 1904                         return;
 1905                 } else {
 1906                         /*
 1907                          * We assume that an unknown algorithm is the result
 1908                          * of a decryption failure on a shared key auth frame;
 1909                          * return a status code appropriate for that instead
 1910                          * of IEEE80211_STATUS_ALG.
 1911                          *
 1912                          * NB: a seq# of 4 is intentional; the decrypted
 1913                          *     frame likely has a bogus seq value.
 1914                          */
 1915                         authalgreject(ni, wh, algo,
 1916                             4, IEEE80211_STATUS_CHALLENGE);
 1917                         return;
 1918                 } 
 1919                 break;
 1920         }
 1921 
 1922         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1923         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
 1924                 uint16_t capinfo, lintval;
 1925                 struct ieee80211_rsnparms rsnparms;
 1926 
 1927                 if (vap->iv_state != IEEE80211_S_RUN) {
 1928                         vap->iv_stats.is_rx_mgtdiscard++;
 1929                         return;
 1930                 }
 1931                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
 1932                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 1933                             wh, NULL, "%s", "wrong bssid");
 1934                         vap->iv_stats.is_rx_assoc_bss++;
 1935                         return;
 1936                 }
 1937                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
 1938                         reassoc = 1;
 1939                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
 1940                 } else {
 1941                         reassoc = 0;
 1942                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
 1943                 }
 1944                 if (ni == vap->iv_bss) {
 1945                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
 1946                             "deny %s request, sta not authenticated",
 1947                             reassoc ? "reassoc" : "assoc");
 1948                         ieee80211_send_error(ni, wh->i_addr2,
 1949                             IEEE80211_FC0_SUBTYPE_DEAUTH,
 1950                             IEEE80211_REASON_ASSOC_NOT_AUTHED);
 1951                         vap->iv_stats.is_rx_assoc_notauth++;
 1952                         return;
 1953                 }
 1954 
 1955                 /*
 1956                  * asreq frame format
 1957                  *      [2] capability information
 1958                  *      [2] listen interval
 1959                  *      [6*] current AP address (reassoc only)
 1960                  *      [tlv] ssid
 1961                  *      [tlv] supported rates
 1962                  *      [tlv] extended supported rates
 1963                  *      [tlv] WPA or RSN
 1964                  *      [tlv] HT capabilities
 1965                  *      [tlv] Atheros capabilities
 1966                  */
 1967                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
 1968                 capinfo = le16toh(*(uint16_t *)frm);    frm += 2;
 1969                 lintval = le16toh(*(uint16_t *)frm);    frm += 2;
 1970                 if (reassoc)
 1971                         frm += 6;       /* ignore current AP info */
 1972                 ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
 1973                 sfrm = frm;
 1974                 while (efrm - frm > 1) {
 1975                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 1976                         switch (*frm) {
 1977                         case IEEE80211_ELEMID_SSID:
 1978                                 ssid = frm;
 1979                                 break;
 1980                         case IEEE80211_ELEMID_RATES:
 1981                                 rates = frm;
 1982                                 break;
 1983                         case IEEE80211_ELEMID_XRATES:
 1984                                 xrates = frm;
 1985                                 break;
 1986                         case IEEE80211_ELEMID_RSN:
 1987                                 rsn = frm;
 1988                                 break;
 1989                         case IEEE80211_ELEMID_HTCAP:
 1990                                 htcap = frm;
 1991                                 break;
 1992                         case IEEE80211_ELEMID_VENDOR:
 1993                                 if (iswpaoui(frm))
 1994                                         wpa = frm;
 1995                                 else if (iswmeinfo(frm))
 1996                                         wme = frm;
 1997 #ifdef IEEE80211_SUPPORT_SUPERG
 1998                                 else if (isatherosoui(frm))
 1999                                         ath = frm;
 2000 #endif
 2001                                 else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
 2002                                         if (ishtcapoui(frm) && htcap == NULL)
 2003                                                 htcap = frm;
 2004                                 }
 2005                                 break;
 2006                         }
 2007                         frm += frm[1] + 2;
 2008                 }
 2009                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
 2010                 if (xrates != NULL)
 2011                         IEEE80211_VERIFY_ELEMENT(xrates,
 2012                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
 2013                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
 2014                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
 2015                 if (htcap != NULL) {
 2016                         IEEE80211_VERIFY_LENGTH(htcap[1],
 2017                              htcap[0] == IEEE80211_ELEMID_VENDOR ?
 2018                                  4 + sizeof(struct ieee80211_ie_htcap)-2 :
 2019                                  sizeof(struct ieee80211_ie_htcap)-2,
 2020                              return);           /* XXX just NULL out? */
 2021                 }
 2022 
 2023                 if ((vap->iv_flags & IEEE80211_F_WPA) &&
 2024                     !wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
 2025                         return;
 2026                 /* discard challenge after association */
 2027                 if (ni->ni_challenge != NULL) {
 2028                         free(ni->ni_challenge, M_80211_NODE);
 2029                         ni->ni_challenge = NULL;
 2030                 }
 2031                 /* NB: 802.11 spec says to ignore station's privacy bit */
 2032                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
 2033                         capinfomismatch(ni, wh, reassoc, resp,
 2034                             "capability", capinfo);
 2035                         return;
 2036                 }
 2037                 /*
 2038                  * Disallow re-associate w/ invalid slot time setting.
 2039                  */
 2040                 if (ni->ni_associd != 0 &&
 2041                     IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
 2042                     ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
 2043                         capinfomismatch(ni, wh, reassoc, resp,
 2044                             "slot time", capinfo);
 2045                         return;
 2046                 }
 2047                 rate = ieee80211_setup_rates(ni, rates, xrates,
 2048                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 2049                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 2050                 if (rate & IEEE80211_RATE_BASIC) {
 2051                         ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
 2052                         vap->iv_stats.is_rx_assoc_norate++;
 2053                         return;
 2054                 }
 2055                 /*
 2056                  * If constrained to 11g-only stations reject an
 2057                  * 11b-only station.  We cheat a bit here by looking
 2058                  * at the max negotiated xmit rate and assuming anyone
 2059                  * with a best rate <24Mb/s is an 11b station.
 2060                  */
 2061                 if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
 2062                         ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
 2063                         vap->iv_stats.is_rx_assoc_norate++;
 2064                         return;
 2065                 }
 2066                 /*
 2067                  * Do HT rate set handling and setup HT node state.
 2068                  */
 2069                 ni->ni_chan = vap->iv_bss->ni_chan;
 2070                 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
 2071                         rate = ieee80211_setup_htrates(ni, htcap,
 2072                                 IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
 2073                                 IEEE80211_F_DOBRS);
 2074                         if (rate & IEEE80211_RATE_BASIC) {
 2075                                 ratesetmismatch(ni, wh, reassoc, resp,
 2076                                     "HT", rate);
 2077                                 vap->iv_stats.is_ht_assoc_norate++;
 2078                                 return;
 2079                         }
 2080                         ieee80211_ht_node_init(ni);
 2081                         ieee80211_ht_updatehtcap(ni, htcap);
 2082                 } else if (ni->ni_flags & IEEE80211_NODE_HT)
 2083                         ieee80211_ht_node_cleanup(ni);
 2084 #ifdef IEEE80211_SUPPORT_SUPERG
 2085                 else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
 2086                         ieee80211_ff_node_cleanup(ni);
 2087 #endif
 2088                 /*
 2089                  * Allow AMPDU operation only with unencrypted traffic
 2090                  * or AES-CCM; the 11n spec only specifies these ciphers
 2091                  * so permitting any others is undefined and can lead
 2092                  * to interoperability problems.
 2093                  */
 2094                 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
 2095                     (((vap->iv_flags & IEEE80211_F_WPA) &&
 2096                       rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
 2097                      (vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
 2098                         IEEE80211_NOTE(vap,
 2099                             IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
 2100                             "disallow HT use because WEP or TKIP requested, "
 2101                             "capinfo 0x%x ucastcipher %d", capinfo,
 2102                             rsnparms.rsn_ucastcipher);
 2103                         ieee80211_ht_node_cleanup(ni);
 2104                         vap->iv_stats.is_ht_assoc_downgrade++;
 2105                 }
 2106                 /*
 2107                  * If constrained to 11n-only stations reject legacy stations.
 2108                  */
 2109                 if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
 2110                     (ni->ni_flags & IEEE80211_NODE_HT) == 0) {
 2111                         htcapmismatch(ni, wh, reassoc, resp);
 2112                         vap->iv_stats.is_ht_assoc_nohtcap++;
 2113                         return;
 2114                 }
 2115                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 2116                 ni->ni_noise = nf;
 2117                 ni->ni_intval = lintval;
 2118                 ni->ni_capinfo = capinfo;
 2119                 ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
 2120                 ni->ni_fhindex = vap->iv_bss->ni_fhindex;
 2121                 /*
 2122                  * Store the IEs.
 2123                  * XXX maybe better to just expand
 2124                  */
 2125                 if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
 2126 #define setie(_ie, _off)        ieee80211_ies_setie(ni->ni_ies, _ie, _off)
 2127                         if (wpa != NULL)
 2128                                 setie(wpa_ie, wpa - sfrm);
 2129                         if (rsn != NULL)
 2130                                 setie(rsn_ie, rsn - sfrm);
 2131                         if (htcap != NULL)
 2132                                 setie(htcap_ie, htcap - sfrm);
 2133                         if (wme != NULL) {
 2134                                 setie(wme_ie, wme - sfrm);
 2135                                 /*
 2136                                  * Mark node as capable of QoS.
 2137                                  */
 2138                                 ni->ni_flags |= IEEE80211_NODE_QOS;
 2139                         } else
 2140                                 ni->ni_flags &= ~IEEE80211_NODE_QOS;
 2141 #ifdef IEEE80211_SUPPORT_SUPERG
 2142                         if (ath != NULL) {
 2143                                 setie(ath_ie, ath - sfrm);
 2144                                 /* 
 2145                                  * Parse ATH station parameters.
 2146                                  */
 2147                                 ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
 2148                         } else
 2149 #endif
 2150                                 ni->ni_ath_flags = 0;
 2151 #undef setie
 2152                 } else {
 2153                         ni->ni_flags &= ~IEEE80211_NODE_QOS;
 2154                         ni->ni_ath_flags = 0;
 2155                 }
 2156                 ieee80211_node_join(ni, resp);
 2157                 ieee80211_deliver_l2uf(ni);
 2158                 break;
 2159         }
 2160 
 2161         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 2162         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
 2163                 uint16_t reason;
 2164 
 2165                 if (vap->iv_state != IEEE80211_S_RUN ||
 2166                     /* NB: can happen when in promiscuous mode */
 2167                     !IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
 2168                         vap->iv_stats.is_rx_mgtdiscard++;
 2169                         break;
 2170                 }
 2171                 /*
 2172                  * deauth/disassoc frame format
 2173                  *      [2] reason
 2174                  */
 2175                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
 2176                 reason = le16toh(*(uint16_t *)frm);
 2177                 if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
 2178                         vap->iv_stats.is_rx_deauth++;
 2179                         IEEE80211_NODE_STAT(ni, rx_deauth);
 2180                 } else {
 2181                         vap->iv_stats.is_rx_disassoc++;
 2182                         IEEE80211_NODE_STAT(ni, rx_disassoc);
 2183                 }
 2184                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 2185                     "recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
 2186                         IEEE80211_FC0_SUBTYPE_SHIFT], reason);
 2187                 if (ni != vap->iv_bss)
 2188                         ieee80211_node_leave(ni);
 2189                 break;
 2190         }
 2191 
 2192         case IEEE80211_FC0_SUBTYPE_ACTION:
 2193         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 2194                 if (ni == vap->iv_bss) {
 2195                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 2196                             wh, NULL, "%s", "unknown node");
 2197                         vap->iv_stats.is_rx_mgtdiscard++;
 2198                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
 2199                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 2200                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 2201                             wh, NULL, "%s", "not for us");
 2202                         vap->iv_stats.is_rx_mgtdiscard++;
 2203                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 2204                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 2205                             wh, NULL, "wrong state %s",
 2206                             ieee80211_state_name[vap->iv_state]);
 2207                         vap->iv_stats.is_rx_mgtdiscard++;
 2208                 } else {
 2209                         if (ieee80211_parse_action(ni, m0) == 0)
 2210                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 2211                 }
 2212                 break;
 2213 
 2214         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 2215         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 2216         case IEEE80211_FC0_SUBTYPE_ATIM:
 2217                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 2218                     wh, NULL, "%s", "not handled");
 2219                 vap->iv_stats.is_rx_mgtdiscard++;
 2220                 break;
 2221 
 2222         default:
 2223                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 2224                     wh, "mgt", "subtype 0x%x not handled", subtype);
 2225                 vap->iv_stats.is_rx_badsubtype++;
 2226                 break;
 2227         }
 2228 }
 2229 
 2230 static void
 2231 hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
 2232 {
 2233         switch (subtype) {
 2234         case IEEE80211_FC0_SUBTYPE_PS_POLL:
 2235                 hostap_recv_pspoll(ni, m);
 2236                 break;
 2237         case IEEE80211_FC0_SUBTYPE_BAR:
 2238                 ieee80211_recv_bar(ni, m);
 2239                 break;
 2240         }
 2241 }
 2242 
 2243 /*
 2244  * Process a received ps-poll frame.
 2245  */
 2246 static void
 2247 hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
 2248 {
 2249         struct ieee80211vap *vap = ni->ni_vap;
 2250         struct ieee80211_frame_min *wh;
 2251         struct ifnet *ifp;
 2252         struct mbuf *m;
 2253         uint16_t aid;
 2254         int qlen;
 2255 
 2256         wh = mtod(m0, struct ieee80211_frame_min *);
 2257         if (ni->ni_associd == 0) {
 2258                 IEEE80211_DISCARD(vap,
 2259                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
 2260                     (struct ieee80211_frame *) wh, NULL,
 2261                     "%s", "unassociated station");
 2262                 vap->iv_stats.is_ps_unassoc++;
 2263                 IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
 2264                         IEEE80211_REASON_NOT_ASSOCED);
 2265                 return;
 2266         }
 2267 
 2268         aid = le16toh(*(uint16_t *)wh->i_dur);
 2269         if (aid != ni->ni_associd) {
 2270                 IEEE80211_DISCARD(vap,
 2271                     IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
 2272                     (struct ieee80211_frame *) wh, NULL,
 2273                     "aid mismatch: sta aid 0x%x poll aid 0x%x",
 2274                     ni->ni_associd, aid);
 2275                 vap->iv_stats.is_ps_badaid++;
 2276                 /*
 2277                  * NB: We used to deauth the station but it turns out
 2278                  * the Blackberry Curve 8230 (and perhaps other devices) 
 2279                  * sometimes send the wrong AID when WME is negotiated.
 2280                  * Being more lenient here seems ok as we already check
 2281                  * the station is associated and we only return frames
 2282                  * queued for the station (i.e. we don't use the AID).
 2283                  */
 2284                 return;
 2285         }
 2286 
 2287         /* Okay, take the first queued packet and put it out... */
 2288         m = ieee80211_node_psq_dequeue(ni, &qlen);
 2289         if (m == NULL) {
 2290                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
 2291                     "%s", "recv ps-poll, but queue empty");
 2292                 ieee80211_send_nulldata(ieee80211_ref_node(ni));
 2293                 vap->iv_stats.is_ps_qempty++;   /* XXX node stat */
 2294                 if (vap->iv_set_tim != NULL)
 2295                         vap->iv_set_tim(ni, 0); /* just in case */
 2296                 return;
 2297         }
 2298         /* 
 2299          * If there are more packets, set the more packets bit
 2300          * in the packet dispatched to the station; otherwise
 2301          * turn off the TIM bit.
 2302          */
 2303         if (qlen != 0) {
 2304                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
 2305                     "recv ps-poll, send packet, %u still queued", qlen);
 2306                 m->m_flags |= M_MORE_DATA;
 2307         } else {
 2308                 IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
 2309                     "%s", "recv ps-poll, send packet, queue empty");
 2310                 if (vap->iv_set_tim != NULL)
 2311                         vap->iv_set_tim(ni, 0);
 2312         }
 2313         m->m_flags |= M_PWR_SAV;                /* bypass PS handling */
 2314 
 2315         if (m->m_flags & M_ENCAP)
 2316                 ifp = vap->iv_ic->ic_ifp;
 2317         else
 2318                 ifp = vap->iv_ifp;
 2319         IF_ENQUEUE(&ifp->if_snd, m);
 2320         if_start(ifp);
 2321 }

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